vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use virtual console

[linux/fpc-iii.git] / drivers / scsi / mpt3sas / mpt3sas_scsih.c

/*
 * Scsi Host Layer for MPT (Message Passing Technology) based controllers
 *
 * This code is based on drivers/scsi/mpt3sas/mpt3sas_scsih.c
 * Copyright (C) 2012-2014  LSI Corporation
 * Copyright (C) 2013-2014 Avago Technologies
 *  (mailto: MPT-FusionLinux.pdl@avagotech.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * NO WARRANTY
 * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
 * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
 * solely responsible for determining the appropriateness of using and
 * distributing the Program and assumes all risks associated with its
 * exercise of rights under this Agreement, including but not limited to
 * the risks and costs of program errors, damage to or loss of data,
 * programs or equipment, and unavailability or interruption of operations.

 * DISCLAIMER OF LIABILITY
 * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
 * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/blkdev.h>
#include <linux/sched.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/pci-aspm.h>
#include <linux/interrupt.h>
#include <linux/aer.h>
#include <linux/raid_class.h>
#include <asm/unaligned.h>

#include "mpt3sas_base.h"

#define RAID_CHANNEL 1

#define PCIE_CHANNEL 2

/* forward proto's */
static void _scsih_expander_node_remove(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_node *sas_expander);
static void _firmware_event_work(struct work_struct *work);

static void _scsih_remove_device(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_device *sas_device);
static int _scsih_add_device(struct MPT3SAS_ADAPTER *ioc, u16 handle,
        u8 retry_count, u8 is_pd);
static int _scsih_pcie_add_device(struct MPT3SAS_ADAPTER *ioc, u16 handle);
static void _scsih_pcie_device_remove_from_sml(struct MPT3SAS_ADAPTER *ioc,
        struct _pcie_device *pcie_device);
static void
_scsih_pcie_check_device(struct MPT3SAS_ADAPTER *ioc, u16 handle);
static u8 _scsih_check_for_pending_tm(struct MPT3SAS_ADAPTER *ioc, u16 smid);

/* global parameters */
LIST_HEAD(mpt3sas_ioc_list);
/* global ioc lock for list operations */
DEFINE_SPINLOCK(gioc_lock);

MODULE_AUTHOR(MPT3SAS_AUTHOR);
MODULE_DESCRIPTION(MPT3SAS_DESCRIPTION);
MODULE_LICENSE("GPL");
MODULE_VERSION(MPT3SAS_DRIVER_VERSION);
MODULE_ALIAS("mpt2sas");

/* local parameters */
static u8 scsi_io_cb_idx = -1;
static u8 tm_cb_idx = -1;
static u8 ctl_cb_idx = -1;
static u8 base_cb_idx = -1;
static u8 port_enable_cb_idx = -1;
static u8 transport_cb_idx = -1;
static u8 scsih_cb_idx = -1;
static u8 config_cb_idx = -1;
static int mpt2_ids;
static int mpt3_ids;

static u8 tm_tr_cb_idx = -1 ;
static u8 tm_tr_volume_cb_idx = -1 ;
static u8 tm_sas_control_cb_idx = -1;

/* command line options */
static u32 logging_level;
MODULE_PARM_DESC(logging_level,
        " bits for enabling additional logging info (default=0)");


static ushort max_sectors = 0xFFFF;
module_param(max_sectors, ushort, 0);
MODULE_PARM_DESC(max_sectors, "max sectors, range 64 to 32767  default=32767");


static int missing_delay[2] = {-1, -1};
module_param_array(missing_delay, int, NULL, 0);
MODULE_PARM_DESC(missing_delay, " device missing delay , io missing delay");

/* scsi-mid layer global parmeter is max_report_luns, which is 511 */
#define MPT3SAS_MAX_LUN (16895)
static u64 max_lun = MPT3SAS_MAX_LUN;
module_param(max_lun, ullong, 0);
MODULE_PARM_DESC(max_lun, " max lun, default=16895 ");

static ushort hbas_to_enumerate;
module_param(hbas_to_enumerate, ushort, 0);
MODULE_PARM_DESC(hbas_to_enumerate,
                " 0 - enumerates both SAS 2.0 & SAS 3.0 generation HBAs\n \
                  1 - enumerates only SAS 2.0 generation HBAs\n \
                  2 - enumerates only SAS 3.0 generation HBAs (default=0)");

/* diag_buffer_enable is bitwise
 * bit 0 set = TRACE
 * bit 1 set = SNAPSHOT
 * bit 2 set = EXTENDED
 *
 * Either bit can be set, or both
 */
static int diag_buffer_enable = -1;
module_param(diag_buffer_enable, int, 0);
MODULE_PARM_DESC(diag_buffer_enable,
        " post diag buffers (TRACE=1/SNAPSHOT=2/EXTENDED=4/default=0)");
static int disable_discovery = -1;
module_param(disable_discovery, int, 0);
MODULE_PARM_DESC(disable_discovery, " disable discovery ");


/* permit overriding the host protection capabilities mask (EEDP/T10 PI) */
static int prot_mask = -1;
module_param(prot_mask, int, 0);
MODULE_PARM_DESC(prot_mask, " host protection capabilities mask, def=7 ");


/* raid transport support */
static struct raid_template *mpt3sas_raid_template;
static struct raid_template *mpt2sas_raid_template;


/**
 * struct sense_info - common structure for obtaining sense keys
 * @skey: sense key
 * @asc: additional sense code
 * @ascq: additional sense code qualifier
 */
struct sense_info {
        u8 skey;
        u8 asc;
        u8 ascq;
};

#define MPT3SAS_PROCESS_TRIGGER_DIAG (0xFFFB)
#define MPT3SAS_TURN_ON_PFA_LED (0xFFFC)
#define MPT3SAS_PORT_ENABLE_COMPLETE (0xFFFD)
#define MPT3SAS_ABRT_TASK_SET (0xFFFE)
#define MPT3SAS_REMOVE_UNRESPONDING_DEVICES (0xFFFF)
/**
 * struct fw_event_work - firmware event struct
 * @list: link list framework
 * @work: work object (ioc->fault_reset_work_q)
 * @ioc: per adapter object
 * @device_handle: device handle
 * @VF_ID: virtual function id
 * @VP_ID: virtual port id
 * @ignore: flag meaning this event has been marked to ignore
 * @event: firmware event MPI2_EVENT_XXX defined in mpi2_ioc.h
 * @refcount: kref for this event
 * @event_data: reply event data payload follows
 *
 * This object stored on ioc->fw_event_list.
 */
struct fw_event_work {
        struct list_head        list;
        struct work_struct      work;

        struct MPT3SAS_ADAPTER *ioc;
        u16                     device_handle;
        u8                      VF_ID;
        u8                      VP_ID;
        u8                      ignore;
        u16                     event;
        struct kref             refcount;
        char                    event_data[0] __aligned(4);
};

static void fw_event_work_free(struct kref *r)
{
        kfree(container_of(r, struct fw_event_work, refcount));
}

static void fw_event_work_get(struct fw_event_work *fw_work)
{
        kref_get(&fw_work->refcount);
}

static void fw_event_work_put(struct fw_event_work *fw_work)
{
        kref_put(&fw_work->refcount, fw_event_work_free);
}

static struct fw_event_work *alloc_fw_event_work(int len)
{
        struct fw_event_work *fw_event;

        fw_event = kzalloc(sizeof(*fw_event) + len, GFP_ATOMIC);
        if (!fw_event)
                return NULL;

        kref_init(&fw_event->refcount);
        return fw_event;
}

/**
 * struct _scsi_io_transfer - scsi io transfer
 * @handle: sas device handle (assigned by firmware)
 * @is_raid: flag set for hidden raid components
 * @dir: DMA_TO_DEVICE, DMA_FROM_DEVICE,
 * @data_length: data transfer length
 * @data_dma: dma pointer to data
 * @sense: sense data
 * @lun: lun number
 * @cdb_length: cdb length
 * @cdb: cdb contents
 * @timeout: timeout for this command
 * @VF_ID: virtual function id
 * @VP_ID: virtual port id
 * @valid_reply: flag set for reply message
 * @sense_length: sense length
 * @ioc_status: ioc status
 * @scsi_state: scsi state
 * @scsi_status: scsi staus
 * @log_info: log information
 * @transfer_length: data length transfer when there is a reply message
 *
 * Used for sending internal scsi commands to devices within this module.
 * Refer to _scsi_send_scsi_io().
 */
struct _scsi_io_transfer {
        u16     handle;
        u8      is_raid;
        enum dma_data_direction dir;
        u32     data_length;
        dma_addr_t data_dma;
        u8      sense[SCSI_SENSE_BUFFERSIZE];
        u32     lun;
        u8      cdb_length;
        u8      cdb[32];
        u8      timeout;
        u8      VF_ID;
        u8      VP_ID;
        u8      valid_reply;
  /* the following bits are only valid when 'valid_reply = 1' */
        u32     sense_length;
        u16     ioc_status;
        u8      scsi_state;
        u8      scsi_status;
        u32     log_info;
        u32     transfer_length;
};

/**
 * _scsih_set_debug_level - global setting of ioc->logging_level.
 * @val: ?
 * @kp: ?
 *
 * Note: The logging levels are defined in mpt3sas_debug.h.
 */
static int
_scsih_set_debug_level(const char *val, const struct kernel_param *kp)
{
        int ret = param_set_int(val, kp);
        struct MPT3SAS_ADAPTER *ioc;

        if (ret)
                return ret;

        pr_info("setting logging_level(0x%08x)\n", logging_level);
        spin_lock(&gioc_lock);
        list_for_each_entry(ioc, &mpt3sas_ioc_list, list)
                ioc->logging_level = logging_level;
        spin_unlock(&gioc_lock);
        return 0;
}
module_param_call(logging_level, _scsih_set_debug_level, param_get_int,
        &logging_level, 0644);

/**
 * _scsih_srch_boot_sas_address - search based on sas_address
 * @sas_address: sas address
 * @boot_device: boot device object from bios page 2
 *
 * Return: 1 when there's a match, 0 means no match.
 */
static inline int
_scsih_srch_boot_sas_address(u64 sas_address,
        Mpi2BootDeviceSasWwid_t *boot_device)
{
        return (sas_address == le64_to_cpu(boot_device->SASAddress)) ?  1 : 0;
}

/**
 * _scsih_srch_boot_device_name - search based on device name
 * @device_name: device name specified in INDENTIFY fram
 * @boot_device: boot device object from bios page 2
 *
 * Return: 1 when there's a match, 0 means no match.
 */
static inline int
_scsih_srch_boot_device_name(u64 device_name,
        Mpi2BootDeviceDeviceName_t *boot_device)
{
        return (device_name == le64_to_cpu(boot_device->DeviceName)) ? 1 : 0;
}

/**
 * _scsih_srch_boot_encl_slot - search based on enclosure_logical_id/slot
 * @enclosure_logical_id: enclosure logical id
 * @slot_number: slot number
 * @boot_device: boot device object from bios page 2
 *
 * Return: 1 when there's a match, 0 means no match.
 */
static inline int
_scsih_srch_boot_encl_slot(u64 enclosure_logical_id, u16 slot_number,
        Mpi2BootDeviceEnclosureSlot_t *boot_device)
{
        return (enclosure_logical_id == le64_to_cpu(boot_device->
            EnclosureLogicalID) && slot_number == le16_to_cpu(boot_device->
            SlotNumber)) ? 1 : 0;
}

/**
 * _scsih_is_boot_device - search for matching boot device.
 * @sas_address: sas address
 * @device_name: device name specified in INDENTIFY fram
 * @enclosure_logical_id: enclosure logical id
 * @slot: slot number
 * @form: specifies boot device form
 * @boot_device: boot device object from bios page 2
 *
 * Return: 1 when there's a match, 0 means no match.
 */
static int
_scsih_is_boot_device(u64 sas_address, u64 device_name,
        u64 enclosure_logical_id, u16 slot, u8 form,
        Mpi2BiosPage2BootDevice_t *boot_device)
{
        int rc = 0;

        switch (form) {
        case MPI2_BIOSPAGE2_FORM_SAS_WWID:
                if (!sas_address)
                        break;
                rc = _scsih_srch_boot_sas_address(
                    sas_address, &boot_device->SasWwid);
                break;
        case MPI2_BIOSPAGE2_FORM_ENCLOSURE_SLOT:
                if (!enclosure_logical_id)
                        break;
                rc = _scsih_srch_boot_encl_slot(
                    enclosure_logical_id,
                    slot, &boot_device->EnclosureSlot);
                break;
        case MPI2_BIOSPAGE2_FORM_DEVICE_NAME:
                if (!device_name)
                        break;
                rc = _scsih_srch_boot_device_name(
                    device_name, &boot_device->DeviceName);
                break;
        case MPI2_BIOSPAGE2_FORM_NO_DEVICE_SPECIFIED:
                break;
        }

        return rc;
}

/**
 * _scsih_get_sas_address - set the sas_address for given device handle
 * @ioc: ?
 * @handle: device handle
 * @sas_address: sas address
 *
 * Return: 0 success, non-zero when failure
 */
static int
_scsih_get_sas_address(struct MPT3SAS_ADAPTER *ioc, u16 handle,
        u64 *sas_address)
{
        Mpi2SasDevicePage0_t sas_device_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u32 ioc_status;

        *sas_address = 0;

        if ((mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
            MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n", ioc->name,
                __FILE__, __LINE__, __func__);
                return -ENXIO;
        }

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
        if (ioc_status == MPI2_IOCSTATUS_SUCCESS) {
                /* For HBA, vSES doesn't return HBA SAS address. Instead return
                 * vSES's sas address.
                 */
                if ((handle <= ioc->sas_hba.num_phys) &&
                   (!(le32_to_cpu(sas_device_pg0.DeviceInfo) &
                   MPI2_SAS_DEVICE_INFO_SEP)))
                        *sas_address = ioc->sas_hba.sas_address;
                else
                        *sas_address = le64_to_cpu(sas_device_pg0.SASAddress);
                return 0;
        }

        /* we hit this because the given parent handle doesn't exist */
        if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
                return -ENXIO;

        /* else error case */
        pr_err(MPT3SAS_FMT
                "handle(0x%04x), ioc_status(0x%04x), failure at %s:%d/%s()!\n",
                ioc->name, handle, ioc_status,
             __FILE__, __LINE__, __func__);
        return -EIO;
}

/**
 * _scsih_determine_boot_device - determine boot device.
 * @ioc: per adapter object
 * @device: sas_device or pcie_device object
 * @channel: SAS or PCIe channel
 *
 * Determines whether this device should be first reported device to
 * to scsi-ml or sas transport, this purpose is for persistent boot device.
 * There are primary, alternate, and current entries in bios page 2. The order
 * priority is primary, alternate, then current.  This routine saves
 * the corresponding device object.
 * The saved data to be used later in _scsih_probe_boot_devices().
 */
static void
_scsih_determine_boot_device(struct MPT3SAS_ADAPTER *ioc, void *device,
        u32 channel)
{
        struct _sas_device *sas_device;
        struct _pcie_device *pcie_device;
        struct _raid_device *raid_device;
        u64 sas_address;
        u64 device_name;
        u64 enclosure_logical_id;
        u16 slot;

         /* only process this function when driver loads */
        if (!ioc->is_driver_loading)
                return;

         /* no Bios, return immediately */
        if (!ioc->bios_pg3.BiosVersion)
                return;

        if (channel == RAID_CHANNEL) {
                raid_device = device;
                sas_address = raid_device->wwid;
                device_name = 0;
                enclosure_logical_id = 0;
                slot = 0;
        } else if (channel == PCIE_CHANNEL) {
                pcie_device = device;
                sas_address = pcie_device->wwid;
                device_name = 0;
                enclosure_logical_id = 0;
                slot = 0;
        } else {
                sas_device = device;
                sas_address = sas_device->sas_address;
                device_name = sas_device->device_name;
                enclosure_logical_id = sas_device->enclosure_logical_id;
                slot = sas_device->slot;
        }

        if (!ioc->req_boot_device.device) {
                if (_scsih_is_boot_device(sas_address, device_name,
                    enclosure_logical_id, slot,
                    (ioc->bios_pg2.ReqBootDeviceForm &
                    MPI2_BIOSPAGE2_FORM_MASK),
                    &ioc->bios_pg2.RequestedBootDevice)) {
                        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                           "%s: req_boot_device(0x%016llx)\n",
                            ioc->name, __func__,
                            (unsigned long long)sas_address));
                        ioc->req_boot_device.device = device;
                        ioc->req_boot_device.channel = channel;
                }
        }

        if (!ioc->req_alt_boot_device.device) {
                if (_scsih_is_boot_device(sas_address, device_name,
                    enclosure_logical_id, slot,
                    (ioc->bios_pg2.ReqAltBootDeviceForm &
                    MPI2_BIOSPAGE2_FORM_MASK),
                    &ioc->bios_pg2.RequestedAltBootDevice)) {
                        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                           "%s: req_alt_boot_device(0x%016llx)\n",
                            ioc->name, __func__,
                            (unsigned long long)sas_address));
                        ioc->req_alt_boot_device.device = device;
                        ioc->req_alt_boot_device.channel = channel;
                }
        }

        if (!ioc->current_boot_device.device) {
                if (_scsih_is_boot_device(sas_address, device_name,
                    enclosure_logical_id, slot,
                    (ioc->bios_pg2.CurrentBootDeviceForm &
                    MPI2_BIOSPAGE2_FORM_MASK),
                    &ioc->bios_pg2.CurrentBootDevice)) {
                        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                           "%s: current_boot_device(0x%016llx)\n",
                            ioc->name, __func__,
                            (unsigned long long)sas_address));
                        ioc->current_boot_device.device = device;
                        ioc->current_boot_device.channel = channel;
                }
        }
}

static struct _sas_device *
__mpt3sas_get_sdev_from_target(struct MPT3SAS_ADAPTER *ioc,
                struct MPT3SAS_TARGET *tgt_priv)
{
        struct _sas_device *ret;

        assert_spin_locked(&ioc->sas_device_lock);

        ret = tgt_priv->sas_dev;
        if (ret)
                sas_device_get(ret);

        return ret;
}

static struct _sas_device *
mpt3sas_get_sdev_from_target(struct MPT3SAS_ADAPTER *ioc,
                struct MPT3SAS_TARGET *tgt_priv)
{
        struct _sas_device *ret;
        unsigned long flags;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        ret = __mpt3sas_get_sdev_from_target(ioc, tgt_priv);
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

        return ret;
}

static struct _pcie_device *
__mpt3sas_get_pdev_from_target(struct MPT3SAS_ADAPTER *ioc,
        struct MPT3SAS_TARGET *tgt_priv)
{
        struct _pcie_device *ret;

        assert_spin_locked(&ioc->pcie_device_lock);

        ret = tgt_priv->pcie_dev;
        if (ret)
                pcie_device_get(ret);

        return ret;
}

/**
 * mpt3sas_get_pdev_from_target - pcie device search
 * @ioc: per adapter object
 * @tgt_priv: starget private object
 *
 * Context: This function will acquire ioc->pcie_device_lock and will release
 * before returning the pcie_device object.
 *
 * This searches for pcie_device from target, then return pcie_device object.
 */
static struct _pcie_device *
mpt3sas_get_pdev_from_target(struct MPT3SAS_ADAPTER *ioc,
        struct MPT3SAS_TARGET *tgt_priv)
{
        struct _pcie_device *ret;
        unsigned long flags;

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        ret = __mpt3sas_get_pdev_from_target(ioc, tgt_priv);
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

        return ret;
}

struct _sas_device *
__mpt3sas_get_sdev_by_addr(struct MPT3SAS_ADAPTER *ioc,
                                        u64 sas_address)
{
        struct _sas_device *sas_device;

        assert_spin_locked(&ioc->sas_device_lock);

        list_for_each_entry(sas_device, &ioc->sas_device_list, list)
                if (sas_device->sas_address == sas_address)
                        goto found_device;

        list_for_each_entry(sas_device, &ioc->sas_device_init_list, list)
                if (sas_device->sas_address == sas_address)
                        goto found_device;

        return NULL;

found_device:
        sas_device_get(sas_device);
        return sas_device;
}

/**
 * mpt3sas_get_sdev_by_addr - sas device search
 * @ioc: per adapter object
 * @sas_address: sas address
 * Context: Calling function should acquire ioc->sas_device_lock
 *
 * This searches for sas_device based on sas_address, then return sas_device
 * object.
 */
struct _sas_device *
mpt3sas_get_sdev_by_addr(struct MPT3SAS_ADAPTER *ioc,
        u64 sas_address)
{
        struct _sas_device *sas_device;
        unsigned long flags;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_by_addr(ioc,
                        sas_address);
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

        return sas_device;
}

static struct _sas_device *
__mpt3sas_get_sdev_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _sas_device *sas_device;

        assert_spin_locked(&ioc->sas_device_lock);

        list_for_each_entry(sas_device, &ioc->sas_device_list, list)
                if (sas_device->handle == handle)
                        goto found_device;

        list_for_each_entry(sas_device, &ioc->sas_device_init_list, list)
                if (sas_device->handle == handle)
                        goto found_device;

        return NULL;

found_device:
        sas_device_get(sas_device);
        return sas_device;
}

/**
 * mpt3sas_get_sdev_by_handle - sas device search
 * @ioc: per adapter object
 * @handle: sas device handle (assigned by firmware)
 * Context: Calling function should acquire ioc->sas_device_lock
 *
 * This searches for sas_device based on sas_address, then return sas_device
 * object.
 */
struct _sas_device *
mpt3sas_get_sdev_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _sas_device *sas_device;
        unsigned long flags;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_by_handle(ioc, handle);
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

        return sas_device;
}

/**
 * _scsih_display_enclosure_chassis_info - display device location info
 * @ioc: per adapter object
 * @sas_device: per sas device object
 * @sdev: scsi device struct
 * @starget: scsi target struct
 */
static void
_scsih_display_enclosure_chassis_info(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_device *sas_device, struct scsi_device *sdev,
        struct scsi_target *starget)
{
        if (sdev) {
                if (sas_device->enclosure_handle != 0)
                        sdev_printk(KERN_INFO, sdev,
                            "enclosure logical id (0x%016llx), slot(%d) \n",
                            (unsigned long long)
                            sas_device->enclosure_logical_id,
                            sas_device->slot);
                if (sas_device->connector_name[0] != '\0')
                        sdev_printk(KERN_INFO, sdev,
                            "enclosure level(0x%04x), connector name( %s)\n",
                            sas_device->enclosure_level,
                            sas_device->connector_name);
                if (sas_device->is_chassis_slot_valid)
                        sdev_printk(KERN_INFO, sdev, "chassis slot(0x%04x)\n",
                            sas_device->chassis_slot);
        } else if (starget) {
                if (sas_device->enclosure_handle != 0)
                        starget_printk(KERN_INFO, starget,
                            "enclosure logical id(0x%016llx), slot(%d) \n",
                            (unsigned long long)
                            sas_device->enclosure_logical_id,
                            sas_device->slot);
                if (sas_device->connector_name[0] != '\0')
                        starget_printk(KERN_INFO, starget,
                            "enclosure level(0x%04x), connector name( %s)\n",
                            sas_device->enclosure_level,
                            sas_device->connector_name);
                if (sas_device->is_chassis_slot_valid)
                        starget_printk(KERN_INFO, starget,
                            "chassis slot(0x%04x)\n",
                            sas_device->chassis_slot);
        } else {
                if (sas_device->enclosure_handle != 0)
                        pr_info(MPT3SAS_FMT
                            "enclosure logical id(0x%016llx), slot(%d) \n",
                            ioc->name, (unsigned long long)
                            sas_device->enclosure_logical_id,
                            sas_device->slot);
                if (sas_device->connector_name[0] != '\0')
                        pr_info(MPT3SAS_FMT
                            "enclosure level(0x%04x), connector name( %s)\n",
                            ioc->name, sas_device->enclosure_level,
                            sas_device->connector_name);
                if (sas_device->is_chassis_slot_valid)
                        pr_info(MPT3SAS_FMT "chassis slot(0x%04x)\n",
                            ioc->name, sas_device->chassis_slot);
        }
}

/**
 * _scsih_sas_device_remove - remove sas_device from list.
 * @ioc: per adapter object
 * @sas_device: the sas_device object
 * Context: This function will acquire ioc->sas_device_lock.
 *
 * If sas_device is on the list, remove it and decrement its reference count.
 */
static void
_scsih_sas_device_remove(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_device *sas_device)
{
        unsigned long flags;

        if (!sas_device)
                return;
        pr_info(MPT3SAS_FMT
            "removing handle(0x%04x), sas_addr(0x%016llx)\n",
            ioc->name, sas_device->handle,
            (unsigned long long) sas_device->sas_address);

        _scsih_display_enclosure_chassis_info(ioc, sas_device, NULL, NULL);

        /*
         * The lock serializes access to the list, but we still need to verify
         * that nobody removed the entry while we were waiting on the lock.
         */
        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        if (!list_empty(&sas_device->list)) {
                list_del_init(&sas_device->list);
                sas_device_put(sas_device);
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
}

/**
 * _scsih_device_remove_by_handle - removing device object by handle
 * @ioc: per adapter object
 * @handle: device handle
 */
static void
_scsih_device_remove_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _sas_device *sas_device;
        unsigned long flags;

        if (ioc->shost_recovery)
                return;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_by_handle(ioc, handle);
        if (sas_device) {
                list_del_init(&sas_device->list);
                sas_device_put(sas_device);
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        if (sas_device) {
                _scsih_remove_device(ioc, sas_device);
                sas_device_put(sas_device);
        }
}

/**
 * mpt3sas_device_remove_by_sas_address - removing device object by sas address
 * @ioc: per adapter object
 * @sas_address: device sas_address
 */
void
mpt3sas_device_remove_by_sas_address(struct MPT3SAS_ADAPTER *ioc,
        u64 sas_address)
{
        struct _sas_device *sas_device;
        unsigned long flags;

        if (ioc->shost_recovery)
                return;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_by_addr(ioc, sas_address);
        if (sas_device) {
                list_del_init(&sas_device->list);
                sas_device_put(sas_device);
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        if (sas_device) {
                _scsih_remove_device(ioc, sas_device);
                sas_device_put(sas_device);
        }
}

/**
 * _scsih_sas_device_add - insert sas_device to the list.
 * @ioc: per adapter object
 * @sas_device: the sas_device object
 * Context: This function will acquire ioc->sas_device_lock.
 *
 * Adding new object to the ioc->sas_device_list.
 */
static void
_scsih_sas_device_add(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_device *sas_device)
{
        unsigned long flags;

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "%s: handle(0x%04x), sas_addr(0x%016llx)\n",
                ioc->name, __func__, sas_device->handle,
                (unsigned long long)sas_device->sas_address));

        dewtprintk(ioc, _scsih_display_enclosure_chassis_info(ioc, sas_device,
            NULL, NULL));

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device_get(sas_device);
        list_add_tail(&sas_device->list, &ioc->sas_device_list);
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

        if (ioc->hide_drives) {
                clear_bit(sas_device->handle, ioc->pend_os_device_add);
                return;
        }

        if (!mpt3sas_transport_port_add(ioc, sas_device->handle,
             sas_device->sas_address_parent)) {
                _scsih_sas_device_remove(ioc, sas_device);
        } else if (!sas_device->starget) {
                /*
                 * When asyn scanning is enabled, its not possible to remove
                 * devices while scanning is turned on due to an oops in
                 * scsi_sysfs_add_sdev()->add_device()->sysfs_addrm_start()
                 */
                if (!ioc->is_driver_loading) {
                        mpt3sas_transport_port_remove(ioc,
                            sas_device->sas_address,
                            sas_device->sas_address_parent);
                        _scsih_sas_device_remove(ioc, sas_device);
                }
        } else
                clear_bit(sas_device->handle, ioc->pend_os_device_add);
}

/**
 * _scsih_sas_device_init_add - insert sas_device to the list.
 * @ioc: per adapter object
 * @sas_device: the sas_device object
 * Context: This function will acquire ioc->sas_device_lock.
 *
 * Adding new object at driver load time to the ioc->sas_device_init_list.
 */
static void
_scsih_sas_device_init_add(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_device *sas_device)
{
        unsigned long flags;

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "%s: handle(0x%04x), sas_addr(0x%016llx)\n", ioc->name,
                __func__, sas_device->handle,
                (unsigned long long)sas_device->sas_address));

        dewtprintk(ioc, _scsih_display_enclosure_chassis_info(ioc, sas_device,
            NULL, NULL));

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device_get(sas_device);
        list_add_tail(&sas_device->list, &ioc->sas_device_init_list);
        _scsih_determine_boot_device(ioc, sas_device, 0);
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
}


static struct _pcie_device *
__mpt3sas_get_pdev_by_wwid(struct MPT3SAS_ADAPTER *ioc, u64 wwid)
{
        struct _pcie_device *pcie_device;

        assert_spin_locked(&ioc->pcie_device_lock);

        list_for_each_entry(pcie_device, &ioc->pcie_device_list, list)
                if (pcie_device->wwid == wwid)
                        goto found_device;

        list_for_each_entry(pcie_device, &ioc->pcie_device_init_list, list)
                if (pcie_device->wwid == wwid)
                        goto found_device;

        return NULL;

found_device:
        pcie_device_get(pcie_device);
        return pcie_device;
}


/**
 * mpt3sas_get_pdev_by_wwid - pcie device search
 * @ioc: per adapter object
 * @wwid: wwid
 *
 * Context: This function will acquire ioc->pcie_device_lock and will release
 * before returning the pcie_device object.
 *
 * This searches for pcie_device based on wwid, then return pcie_device object.
 */
static struct _pcie_device *
mpt3sas_get_pdev_by_wwid(struct MPT3SAS_ADAPTER *ioc, u64 wwid)
{
        struct _pcie_device *pcie_device;
        unsigned long flags;

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        pcie_device = __mpt3sas_get_pdev_by_wwid(ioc, wwid);
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

        return pcie_device;
}


static struct _pcie_device *
__mpt3sas_get_pdev_by_idchannel(struct MPT3SAS_ADAPTER *ioc, int id,
        int channel)
{
        struct _pcie_device *pcie_device;

        assert_spin_locked(&ioc->pcie_device_lock);

        list_for_each_entry(pcie_device, &ioc->pcie_device_list, list)
                if (pcie_device->id == id && pcie_device->channel == channel)
                        goto found_device;

        list_for_each_entry(pcie_device, &ioc->pcie_device_init_list, list)
                if (pcie_device->id == id && pcie_device->channel == channel)
                        goto found_device;

        return NULL;

found_device:
        pcie_device_get(pcie_device);
        return pcie_device;
}

static struct _pcie_device *
__mpt3sas_get_pdev_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _pcie_device *pcie_device;

        assert_spin_locked(&ioc->pcie_device_lock);

        list_for_each_entry(pcie_device, &ioc->pcie_device_list, list)
                if (pcie_device->handle == handle)
                        goto found_device;

        list_for_each_entry(pcie_device, &ioc->pcie_device_init_list, list)
                if (pcie_device->handle == handle)
                        goto found_device;

        return NULL;

found_device:
        pcie_device_get(pcie_device);
        return pcie_device;
}


/**
 * mpt3sas_get_pdev_by_handle - pcie device search
 * @ioc: per adapter object
 * @handle: Firmware device handle
 *
 * Context: This function will acquire ioc->pcie_device_lock and will release
 * before returning the pcie_device object.
 *
 * This searches for pcie_device based on handle, then return pcie_device
 * object.
 */
struct _pcie_device *
mpt3sas_get_pdev_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _pcie_device *pcie_device;
        unsigned long flags;

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        pcie_device = __mpt3sas_get_pdev_by_handle(ioc, handle);
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

        return pcie_device;
}

/**
 * _scsih_pcie_device_remove - remove pcie_device from list.
 * @ioc: per adapter object
 * @pcie_device: the pcie_device object
 * Context: This function will acquire ioc->pcie_device_lock.
 *
 * If pcie_device is on the list, remove it and decrement its reference count.
 */
static void
_scsih_pcie_device_remove(struct MPT3SAS_ADAPTER *ioc,
        struct _pcie_device *pcie_device)
{
        unsigned long flags;
        int was_on_pcie_device_list = 0;

        if (!pcie_device)
                return;
        pr_info(MPT3SAS_FMT
                "removing handle(0x%04x), wwid(0x%016llx)\n",
                ioc->name, pcie_device->handle,
                (unsigned long long) pcie_device->wwid);
        if (pcie_device->enclosure_handle != 0)
                pr_info(MPT3SAS_FMT
                        "removing enclosure logical id(0x%016llx), slot(%d)\n",
                        ioc->name,
                        (unsigned long long)pcie_device->enclosure_logical_id,
                pcie_device->slot);
        if (pcie_device->connector_name[0] != '\0')
                pr_info(MPT3SAS_FMT
                    "removing enclosure level(0x%04x), connector name( %s)\n",
                        ioc->name, pcie_device->enclosure_level,
                        pcie_device->connector_name);

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        if (!list_empty(&pcie_device->list)) {
                list_del_init(&pcie_device->list);
                was_on_pcie_device_list = 1;
        }
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
        if (was_on_pcie_device_list) {
                kfree(pcie_device->serial_number);
                pcie_device_put(pcie_device);
        }
}


/**
 * _scsih_pcie_device_remove_by_handle - removing pcie device object by handle
 * @ioc: per adapter object
 * @handle: device handle
 */
static void
_scsih_pcie_device_remove_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _pcie_device *pcie_device;
        unsigned long flags;
        int was_on_pcie_device_list = 0;

        if (ioc->shost_recovery)
                return;

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        pcie_device = __mpt3sas_get_pdev_by_handle(ioc, handle);
        if (pcie_device) {
                if (!list_empty(&pcie_device->list)) {
                        list_del_init(&pcie_device->list);
                        was_on_pcie_device_list = 1;
                        pcie_device_put(pcie_device);
                }
        }
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
        if (was_on_pcie_device_list) {
                _scsih_pcie_device_remove_from_sml(ioc, pcie_device);
                pcie_device_put(pcie_device);
        }
}

/**
 * _scsih_pcie_device_add - add pcie_device object
 * @ioc: per adapter object
 * @pcie_device: pcie_device object
 *
 * This is added to the pcie_device_list link list.
 */
static void
_scsih_pcie_device_add(struct MPT3SAS_ADAPTER *ioc,
        struct _pcie_device *pcie_device)
{
        unsigned long flags;

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "%s: handle (0x%04x), wwid(0x%016llx)\n", ioc->name, __func__,
                pcie_device->handle, (unsigned long long)pcie_device->wwid));
        if (pcie_device->enclosure_handle != 0)
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: enclosure logical id(0x%016llx), slot( %d)\n",
                        ioc->name, __func__,
                        (unsigned long long)pcie_device->enclosure_logical_id,
                        pcie_device->slot));
        if (pcie_device->connector_name[0] != '\0')
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: enclosure level(0x%04x), connector name( %s)\n",
                        ioc->name, __func__, pcie_device->enclosure_level,
                        pcie_device->connector_name));

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        pcie_device_get(pcie_device);
        list_add_tail(&pcie_device->list, &ioc->pcie_device_list);
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

        if (scsi_add_device(ioc->shost, PCIE_CHANNEL, pcie_device->id, 0)) {
                _scsih_pcie_device_remove(ioc, pcie_device);
        } else if (!pcie_device->starget) {
                if (!ioc->is_driver_loading) {
/*TODO-- Need to find out whether this condition will occur or not*/
                        clear_bit(pcie_device->handle, ioc->pend_os_device_add);
                }
        } else
                clear_bit(pcie_device->handle, ioc->pend_os_device_add);
}

/*
 * _scsih_pcie_device_init_add - insert pcie_device to the init list.
 * @ioc: per adapter object
 * @pcie_device: the pcie_device object
 * Context: This function will acquire ioc->pcie_device_lock.
 *
 * Adding new object at driver load time to the ioc->pcie_device_init_list.
 */
static void
_scsih_pcie_device_init_add(struct MPT3SAS_ADAPTER *ioc,
                                struct _pcie_device *pcie_device)
{
        unsigned long flags;

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "%s: handle (0x%04x), wwid(0x%016llx)\n", ioc->name, __func__,
                pcie_device->handle, (unsigned long long)pcie_device->wwid));
        if (pcie_device->enclosure_handle != 0)
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: enclosure logical id(0x%016llx), slot( %d)\n",
                        ioc->name, __func__,
                        (unsigned long long)pcie_device->enclosure_logical_id,
                        pcie_device->slot));
        if (pcie_device->connector_name[0] != '\0')
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: enclosure level(0x%04x), connector name( %s)\n",
                        ioc->name, __func__, pcie_device->enclosure_level,
                        pcie_device->connector_name));

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        pcie_device_get(pcie_device);
        list_add_tail(&pcie_device->list, &ioc->pcie_device_init_list);
        _scsih_determine_boot_device(ioc, pcie_device, PCIE_CHANNEL);
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
}
/**
 * _scsih_raid_device_find_by_id - raid device search
 * @ioc: per adapter object
 * @id: sas device target id
 * @channel: sas device channel
 * Context: Calling function should acquire ioc->raid_device_lock
 *
 * This searches for raid_device based on target id, then return raid_device
 * object.
 */
static struct _raid_device *
_scsih_raid_device_find_by_id(struct MPT3SAS_ADAPTER *ioc, int id, int channel)
{
        struct _raid_device *raid_device, *r;

        r = NULL;
        list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
                if (raid_device->id == id && raid_device->channel == channel) {
                        r = raid_device;
                        goto out;
                }
        }

 out:
        return r;
}

/**
 * mpt3sas_raid_device_find_by_handle - raid device search
 * @ioc: per adapter object
 * @handle: sas device handle (assigned by firmware)
 * Context: Calling function should acquire ioc->raid_device_lock
 *
 * This searches for raid_device based on handle, then return raid_device
 * object.
 */
struct _raid_device *
mpt3sas_raid_device_find_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _raid_device *raid_device, *r;

        r = NULL;
        list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
                if (raid_device->handle != handle)
                        continue;
                r = raid_device;
                goto out;
        }

 out:
        return r;
}

/**
 * _scsih_raid_device_find_by_wwid - raid device search
 * @ioc: per adapter object
 * @wwid: ?
 * Context: Calling function should acquire ioc->raid_device_lock
 *
 * This searches for raid_device based on wwid, then return raid_device
 * object.
 */
static struct _raid_device *
_scsih_raid_device_find_by_wwid(struct MPT3SAS_ADAPTER *ioc, u64 wwid)
{
        struct _raid_device *raid_device, *r;

        r = NULL;
        list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
                if (raid_device->wwid != wwid)
                        continue;
                r = raid_device;
                goto out;
        }

 out:
        return r;
}

/**
 * _scsih_raid_device_add - add raid_device object
 * @ioc: per adapter object
 * @raid_device: raid_device object
 *
 * This is added to the raid_device_list link list.
 */
static void
_scsih_raid_device_add(struct MPT3SAS_ADAPTER *ioc,
        struct _raid_device *raid_device)
{
        unsigned long flags;

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "%s: handle(0x%04x), wwid(0x%016llx)\n", ioc->name, __func__,
            raid_device->handle, (unsigned long long)raid_device->wwid));

        spin_lock_irqsave(&ioc->raid_device_lock, flags);
        list_add_tail(&raid_device->list, &ioc->raid_device_list);
        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
}

/**
 * _scsih_raid_device_remove - delete raid_device object
 * @ioc: per adapter object
 * @raid_device: raid_device object
 *
 */
static void
_scsih_raid_device_remove(struct MPT3SAS_ADAPTER *ioc,
        struct _raid_device *raid_device)
{
        unsigned long flags;

        spin_lock_irqsave(&ioc->raid_device_lock, flags);
        list_del(&raid_device->list);
        kfree(raid_device);
        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
}

/**
 * mpt3sas_scsih_expander_find_by_handle - expander device search
 * @ioc: per adapter object
 * @handle: expander handle (assigned by firmware)
 * Context: Calling function should acquire ioc->sas_device_lock
 *
 * This searches for expander device based on handle, then returns the
 * sas_node object.
 */
struct _sas_node *
mpt3sas_scsih_expander_find_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _sas_node *sas_expander, *r;

        r = NULL;
        list_for_each_entry(sas_expander, &ioc->sas_expander_list, list) {
                if (sas_expander->handle != handle)
                        continue;
                r = sas_expander;
                goto out;
        }
 out:
        return r;
}

/**
 * mpt3sas_scsih_enclosure_find_by_handle - exclosure device search
 * @ioc: per adapter object
 * @handle: enclosure handle (assigned by firmware)
 * Context: Calling function should acquire ioc->sas_device_lock
 *
 * This searches for enclosure device based on handle, then returns the
 * enclosure object.
 */
static struct _enclosure_node *
mpt3sas_scsih_enclosure_find_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _enclosure_node *enclosure_dev, *r;

        r = NULL;
        list_for_each_entry(enclosure_dev, &ioc->enclosure_list, list) {
                if (le16_to_cpu(enclosure_dev->pg0.EnclosureHandle) != handle)
                        continue;
                r = enclosure_dev;
                goto out;
        }
out:
        return r;
}
/**
 * mpt3sas_scsih_expander_find_by_sas_address - expander device search
 * @ioc: per adapter object
 * @sas_address: sas address
 * Context: Calling function should acquire ioc->sas_node_lock.
 *
 * This searches for expander device based on sas_address, then returns the
 * sas_node object.
 */
struct _sas_node *
mpt3sas_scsih_expander_find_by_sas_address(struct MPT3SAS_ADAPTER *ioc,
        u64 sas_address)
{
        struct _sas_node *sas_expander, *r;

        r = NULL;
        list_for_each_entry(sas_expander, &ioc->sas_expander_list, list) {
                if (sas_expander->sas_address != sas_address)
                        continue;
                r = sas_expander;
                goto out;
        }
 out:
        return r;
}

/**
 * _scsih_expander_node_add - insert expander device to the list.
 * @ioc: per adapter object
 * @sas_expander: the sas_device object
 * Context: This function will acquire ioc->sas_node_lock.
 *
 * Adding new object to the ioc->sas_expander_list.
 */
static void
_scsih_expander_node_add(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_node *sas_expander)
{
        unsigned long flags;

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        list_add_tail(&sas_expander->list, &ioc->sas_expander_list);
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
}

/**
 * _scsih_is_end_device - determines if device is an end device
 * @device_info: bitfield providing information about the device.
 * Context: none
 *
 * Return: 1 if end device.
 */
static int
_scsih_is_end_device(u32 device_info)
{
        if (device_info & MPI2_SAS_DEVICE_INFO_END_DEVICE &&
                ((device_info & MPI2_SAS_DEVICE_INFO_SSP_TARGET) |
                (device_info & MPI2_SAS_DEVICE_INFO_STP_TARGET) |
                (device_info & MPI2_SAS_DEVICE_INFO_SATA_DEVICE)))
                return 1;
        else
                return 0;
}

/**
 * _scsih_is_nvme_device - determines if device is an nvme device
 * @device_info: bitfield providing information about the device.
 * Context: none
 *
 * Return: 1 if nvme device.
 */
static int
_scsih_is_nvme_device(u32 device_info)
{
        if ((device_info & MPI26_PCIE_DEVINFO_MASK_DEVICE_TYPE)
                                        == MPI26_PCIE_DEVINFO_NVME)
                return 1;
        else
                return 0;
}

/**
 * mpt3sas_scsih_scsi_lookup_get - returns scmd entry
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Return: the smid stored scmd pointer.
 * Then will dereference the stored scmd pointer.
 */
struct scsi_cmnd *
mpt3sas_scsih_scsi_lookup_get(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        struct scsi_cmnd *scmd = NULL;
        struct scsiio_tracker *st;
        Mpi25SCSIIORequest_t *mpi_request;

        if (smid > 0  &&
            smid <= ioc->scsiio_depth - INTERNAL_SCSIIO_CMDS_COUNT) {
                u32 unique_tag = smid - 1;

                mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);

                /*
                 * If SCSI IO request is outstanding at driver level then
                 * DevHandle filed must be non-zero. If DevHandle is zero
                 * then it means that this smid is free at driver level,
                 * so return NULL.
                 */
                if (!mpi_request->DevHandle)
                        return scmd;

                scmd = scsi_host_find_tag(ioc->shost, unique_tag);
                if (scmd) {
                        st = scsi_cmd_priv(scmd);
                        if (st->cb_idx == 0xFF || st->smid == 0)
                                scmd = NULL;
                }
        }
        return scmd;
}

/**
 * scsih_change_queue_depth - setting device queue depth
 * @sdev: scsi device struct
 * @qdepth: requested queue depth
 *
 * Return: queue depth.
 */
static int
scsih_change_queue_depth(struct scsi_device *sdev, int qdepth)
{
        struct Scsi_Host *shost = sdev->host;
        int max_depth;
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        struct _sas_device *sas_device;
        unsigned long flags;

        max_depth = shost->can_queue;

        /* limit max device queue for SATA to 32 */
        sas_device_priv_data = sdev->hostdata;
        if (!sas_device_priv_data)
                goto not_sata;
        sas_target_priv_data = sas_device_priv_data->sas_target;
        if (!sas_target_priv_data)
                goto not_sata;
        if ((sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME))
                goto not_sata;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_from_target(ioc, sas_target_priv_data);
        if (sas_device) {
                if (sas_device->device_info & MPI2_SAS_DEVICE_INFO_SATA_DEVICE)
                        max_depth = MPT3SAS_SATA_QUEUE_DEPTH;

                sas_device_put(sas_device);
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

 not_sata:

        if (!sdev->tagged_supported)
                max_depth = 1;
        if (qdepth > max_depth)
                qdepth = max_depth;
        return scsi_change_queue_depth(sdev, qdepth);
}

/**
 * scsih_target_alloc - target add routine
 * @starget: scsi target struct
 *
 * Return: 0 if ok. Any other return is assumed to be an error and
 * the device is ignored.
 */
static int
scsih_target_alloc(struct scsi_target *starget)
{
        struct Scsi_Host *shost = dev_to_shost(&starget->dev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        struct MPT3SAS_TARGET *sas_target_priv_data;
        struct _sas_device *sas_device;
        struct _raid_device *raid_device;
        struct _pcie_device *pcie_device;
        unsigned long flags;
        struct sas_rphy *rphy;

        sas_target_priv_data = kzalloc(sizeof(*sas_target_priv_data),
                                       GFP_KERNEL);
        if (!sas_target_priv_data)
                return -ENOMEM;

        starget->hostdata = sas_target_priv_data;
        sas_target_priv_data->starget = starget;
        sas_target_priv_data->handle = MPT3SAS_INVALID_DEVICE_HANDLE;

        /* RAID volumes */
        if (starget->channel == RAID_CHANNEL) {
                spin_lock_irqsave(&ioc->raid_device_lock, flags);
                raid_device = _scsih_raid_device_find_by_id(ioc, starget->id,
                    starget->channel);
                if (raid_device) {
                        sas_target_priv_data->handle = raid_device->handle;
                        sas_target_priv_data->sas_address = raid_device->wwid;
                        sas_target_priv_data->flags |= MPT_TARGET_FLAGS_VOLUME;
                        if (ioc->is_warpdrive)
                                sas_target_priv_data->raid_device = raid_device;
                        raid_device->starget = starget;
                }
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
                return 0;
        }

        /* PCIe devices */
        if (starget->channel == PCIE_CHANNEL) {
                spin_lock_irqsave(&ioc->pcie_device_lock, flags);
                pcie_device = __mpt3sas_get_pdev_by_idchannel(ioc, starget->id,
                        starget->channel);
                if (pcie_device) {
                        sas_target_priv_data->handle = pcie_device->handle;
                        sas_target_priv_data->sas_address = pcie_device->wwid;
                        sas_target_priv_data->pcie_dev = pcie_device;
                        pcie_device->starget = starget;
                        pcie_device->id = starget->id;
                        pcie_device->channel = starget->channel;
                        sas_target_priv_data->flags |=
                                MPT_TARGET_FLAGS_PCIE_DEVICE;
                        if (pcie_device->fast_path)
                                sas_target_priv_data->flags |=
                                        MPT_TARGET_FASTPATH_IO;
                }
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
                return 0;
        }

        /* sas/sata devices */
        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        rphy = dev_to_rphy(starget->dev.parent);
        sas_device = __mpt3sas_get_sdev_by_addr(ioc,
           rphy->identify.sas_address);

        if (sas_device) {
                sas_target_priv_data->handle = sas_device->handle;
                sas_target_priv_data->sas_address = sas_device->sas_address;
                sas_target_priv_data->sas_dev = sas_device;
                sas_device->starget = starget;
                sas_device->id = starget->id;
                sas_device->channel = starget->channel;
                if (test_bit(sas_device->handle, ioc->pd_handles))
                        sas_target_priv_data->flags |=
                            MPT_TARGET_FLAGS_RAID_COMPONENT;
                if (sas_device->fast_path)
                        sas_target_priv_data->flags |=
                                        MPT_TARGET_FASTPATH_IO;
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

        return 0;
}

/**
 * scsih_target_destroy - target destroy routine
 * @starget: scsi target struct
 */
static void
scsih_target_destroy(struct scsi_target *starget)
{
        struct Scsi_Host *shost = dev_to_shost(&starget->dev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        struct MPT3SAS_TARGET *sas_target_priv_data;
        struct _sas_device *sas_device;
        struct _raid_device *raid_device;
        struct _pcie_device *pcie_device;
        unsigned long flags;

        sas_target_priv_data = starget->hostdata;
        if (!sas_target_priv_data)
                return;

        if (starget->channel == RAID_CHANNEL) {
                spin_lock_irqsave(&ioc->raid_device_lock, flags);
                raid_device = _scsih_raid_device_find_by_id(ioc, starget->id,
                    starget->channel);
                if (raid_device) {
                        raid_device->starget = NULL;
                        raid_device->sdev = NULL;
                }
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
                goto out;
        }

        if (starget->channel == PCIE_CHANNEL) {
                spin_lock_irqsave(&ioc->pcie_device_lock, flags);
                pcie_device = __mpt3sas_get_pdev_from_target(ioc,
                                                        sas_target_priv_data);
                if (pcie_device && (pcie_device->starget == starget) &&
                        (pcie_device->id == starget->id) &&
                        (pcie_device->channel == starget->channel))
                        pcie_device->starget = NULL;

                if (pcie_device) {
                        /*
                         * Corresponding get() is in _scsih_target_alloc()
                         */
                        sas_target_priv_data->pcie_dev = NULL;
                        pcie_device_put(pcie_device);
                        pcie_device_put(pcie_device);
                }
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
                goto out;
        }

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_from_target(ioc, sas_target_priv_data);
        if (sas_device && (sas_device->starget == starget) &&
            (sas_device->id == starget->id) &&
            (sas_device->channel == starget->channel))
                sas_device->starget = NULL;

        if (sas_device) {
                /*
                 * Corresponding get() is in _scsih_target_alloc()
                 */
                sas_target_priv_data->sas_dev = NULL;
                sas_device_put(sas_device);

                sas_device_put(sas_device);
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

 out:
        kfree(sas_target_priv_data);
        starget->hostdata = NULL;
}

/**
 * scsih_slave_alloc - device add routine
 * @sdev: scsi device struct
 *
 * Return: 0 if ok. Any other return is assumed to be an error and
 * the device is ignored.
 */
static int
scsih_slave_alloc(struct scsi_device *sdev)
{
        struct Scsi_Host *shost;
        struct MPT3SAS_ADAPTER *ioc;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct scsi_target *starget;
        struct _raid_device *raid_device;
        struct _sas_device *sas_device;
        struct _pcie_device *pcie_device;
        unsigned long flags;

        sas_device_priv_data = kzalloc(sizeof(*sas_device_priv_data),
                                       GFP_KERNEL);
        if (!sas_device_priv_data)
                return -ENOMEM;

        sas_device_priv_data->lun = sdev->lun;
        sas_device_priv_data->flags = MPT_DEVICE_FLAGS_INIT;

        starget = scsi_target(sdev);
        sas_target_priv_data = starget->hostdata;
        sas_target_priv_data->num_luns++;
        sas_device_priv_data->sas_target = sas_target_priv_data;
        sdev->hostdata = sas_device_priv_data;
        if ((sas_target_priv_data->flags & MPT_TARGET_FLAGS_RAID_COMPONENT))
                sdev->no_uld_attach = 1;

        shost = dev_to_shost(&starget->dev);
        ioc = shost_priv(shost);
        if (starget->channel == RAID_CHANNEL) {
                spin_lock_irqsave(&ioc->raid_device_lock, flags);
                raid_device = _scsih_raid_device_find_by_id(ioc,
                    starget->id, starget->channel);
                if (raid_device)
                        raid_device->sdev = sdev; /* raid is single lun */
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
        }
        if (starget->channel == PCIE_CHANNEL) {
                spin_lock_irqsave(&ioc->pcie_device_lock, flags);
                pcie_device = __mpt3sas_get_pdev_by_wwid(ioc,
                                sas_target_priv_data->sas_address);
                if (pcie_device && (pcie_device->starget == NULL)) {
                        sdev_printk(KERN_INFO, sdev,
                            "%s : pcie_device->starget set to starget @ %d\n",
                            __func__, __LINE__);
                        pcie_device->starget = starget;
                }

                if (pcie_device)
                        pcie_device_put(pcie_device);
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

        } else  if (!(sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME)) {
                spin_lock_irqsave(&ioc->sas_device_lock, flags);
                sas_device = __mpt3sas_get_sdev_by_addr(ioc,
                                        sas_target_priv_data->sas_address);
                if (sas_device && (sas_device->starget == NULL)) {
                        sdev_printk(KERN_INFO, sdev,
                        "%s : sas_device->starget set to starget @ %d\n",
                             __func__, __LINE__);
                        sas_device->starget = starget;
                }

                if (sas_device)
                        sas_device_put(sas_device);

                spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        }

        return 0;
}

/**
 * scsih_slave_destroy - device destroy routine
 * @sdev: scsi device struct
 */
static void
scsih_slave_destroy(struct scsi_device *sdev)
{
        struct MPT3SAS_TARGET *sas_target_priv_data;
        struct scsi_target *starget;
        struct Scsi_Host *shost;
        struct MPT3SAS_ADAPTER *ioc;
        struct _sas_device *sas_device;
        struct _pcie_device *pcie_device;
        unsigned long flags;

        if (!sdev->hostdata)
                return;

        starget = scsi_target(sdev);
        sas_target_priv_data = starget->hostdata;
        sas_target_priv_data->num_luns--;

        shost = dev_to_shost(&starget->dev);
        ioc = shost_priv(shost);

        if (sas_target_priv_data->flags & MPT_TARGET_FLAGS_PCIE_DEVICE) {
                spin_lock_irqsave(&ioc->pcie_device_lock, flags);
                pcie_device = __mpt3sas_get_pdev_from_target(ioc,
                                sas_target_priv_data);
                if (pcie_device && !sas_target_priv_data->num_luns)
                        pcie_device->starget = NULL;

                if (pcie_device)
                        pcie_device_put(pcie_device);

                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

        } else if (!(sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME)) {
                spin_lock_irqsave(&ioc->sas_device_lock, flags);
                sas_device = __mpt3sas_get_sdev_from_target(ioc,
                                sas_target_priv_data);
                if (sas_device && !sas_target_priv_data->num_luns)
                        sas_device->starget = NULL;

                if (sas_device)
                        sas_device_put(sas_device);
                spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        }

        kfree(sdev->hostdata);
        sdev->hostdata = NULL;
}

/**
 * _scsih_display_sata_capabilities - sata capabilities
 * @ioc: per adapter object
 * @handle: device handle
 * @sdev: scsi device struct
 */
static void
_scsih_display_sata_capabilities(struct MPT3SAS_ADAPTER *ioc,
        u16 handle, struct scsi_device *sdev)
{
        Mpi2ConfigReply_t mpi_reply;
        Mpi2SasDevicePage0_t sas_device_pg0;
        u32 ioc_status;
        u16 flags;
        u32 device_info;

        if ((mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
            MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return;
        }

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return;
        }

        flags = le16_to_cpu(sas_device_pg0.Flags);
        device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);

        sdev_printk(KERN_INFO, sdev,
            "atapi(%s), ncq(%s), asyn_notify(%s), smart(%s), fua(%s), "
            "sw_preserve(%s)\n",
            (device_info & MPI2_SAS_DEVICE_INFO_ATAPI_DEVICE) ? "y" : "n",
            (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_NCQ_SUPPORTED) ? "y" : "n",
            (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_ASYNCHRONOUS_NOTIFY) ? "y" :
            "n",
            (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_SMART_SUPPORTED) ? "y" : "n",
            (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_FUA_SUPPORTED) ? "y" : "n",
            (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_SW_PRESERVE) ? "y" : "n");
}

/*
 * raid transport support -
 * Enabled for SLES11 and newer, in older kernels the driver will panic when
 * unloading the driver followed by a load - I believe that the subroutine
 * raid_class_release() is not cleaning up properly.
 */

/**
 * scsih_is_raid - return boolean indicating device is raid volume
 * @dev: the device struct object
 */
static int
scsih_is_raid(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(sdev->host);

        if (ioc->is_warpdrive)
                return 0;
        return (sdev->channel == RAID_CHANNEL) ? 1 : 0;
}

static int
scsih_is_nvme(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);

        return (sdev->channel == PCIE_CHANNEL) ? 1 : 0;
}

/**
 * scsih_get_resync - get raid volume resync percent complete
 * @dev: the device struct object
 */
static void
scsih_get_resync(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(sdev->host);
        static struct _raid_device *raid_device;
        unsigned long flags;
        Mpi2RaidVolPage0_t vol_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u32 volume_status_flags;
        u8 percent_complete;
        u16 handle;

        percent_complete = 0;
        handle = 0;
        if (ioc->is_warpdrive)
                goto out;

        spin_lock_irqsave(&ioc->raid_device_lock, flags);
        raid_device = _scsih_raid_device_find_by_id(ioc, sdev->id,
            sdev->channel);
        if (raid_device) {
                handle = raid_device->handle;
                percent_complete = raid_device->percent_complete;
        }
        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);

        if (!handle)
                goto out;

        if (mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply, &vol_pg0,
             MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, handle,
             sizeof(Mpi2RaidVolPage0_t))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                percent_complete = 0;
                goto out;
        }

        volume_status_flags = le32_to_cpu(vol_pg0.VolumeStatusFlags);
        if (!(volume_status_flags &
            MPI2_RAIDVOL0_STATUS_FLAG_RESYNC_IN_PROGRESS))
                percent_complete = 0;

 out:

        switch (ioc->hba_mpi_version_belonged) {
        case MPI2_VERSION:
                raid_set_resync(mpt2sas_raid_template, dev, percent_complete);
                break;
        case MPI25_VERSION:
        case MPI26_VERSION:
                raid_set_resync(mpt3sas_raid_template, dev, percent_complete);
                break;
        }
}

/**
 * scsih_get_state - get raid volume level
 * @dev: the device struct object
 */
static void
scsih_get_state(struct device *dev)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(sdev->host);
        static struct _raid_device *raid_device;
        unsigned long flags;
        Mpi2RaidVolPage0_t vol_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u32 volstate;
        enum raid_state state = RAID_STATE_UNKNOWN;
        u16 handle = 0;

        spin_lock_irqsave(&ioc->raid_device_lock, flags);
        raid_device = _scsih_raid_device_find_by_id(ioc, sdev->id,
            sdev->channel);
        if (raid_device)
                handle = raid_device->handle;
        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);

        if (!raid_device)
                goto out;

        if (mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply, &vol_pg0,
             MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, handle,
             sizeof(Mpi2RaidVolPage0_t))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }

        volstate = le32_to_cpu(vol_pg0.VolumeStatusFlags);
        if (volstate & MPI2_RAIDVOL0_STATUS_FLAG_RESYNC_IN_PROGRESS) {
                state = RAID_STATE_RESYNCING;
                goto out;
        }

        switch (vol_pg0.VolumeState) {
        case MPI2_RAID_VOL_STATE_OPTIMAL:
        case MPI2_RAID_VOL_STATE_ONLINE:
                state = RAID_STATE_ACTIVE;
                break;
        case  MPI2_RAID_VOL_STATE_DEGRADED:
                state = RAID_STATE_DEGRADED;
                break;
        case MPI2_RAID_VOL_STATE_FAILED:
        case MPI2_RAID_VOL_STATE_MISSING:
                state = RAID_STATE_OFFLINE;
                break;
        }
 out:
        switch (ioc->hba_mpi_version_belonged) {
        case MPI2_VERSION:
                raid_set_state(mpt2sas_raid_template, dev, state);
                break;
        case MPI25_VERSION:
        case MPI26_VERSION:
                raid_set_state(mpt3sas_raid_template, dev, state);
                break;
        }
}

/**
 * _scsih_set_level - set raid level
 * @ioc: ?
 * @sdev: scsi device struct
 * @volume_type: volume type
 */
static void
_scsih_set_level(struct MPT3SAS_ADAPTER *ioc,
        struct scsi_device *sdev, u8 volume_type)
{
        enum raid_level level = RAID_LEVEL_UNKNOWN;

        switch (volume_type) {
        case MPI2_RAID_VOL_TYPE_RAID0:
                level = RAID_LEVEL_0;
                break;
        case MPI2_RAID_VOL_TYPE_RAID10:
                level = RAID_LEVEL_10;
                break;
        case MPI2_RAID_VOL_TYPE_RAID1E:
                level = RAID_LEVEL_1E;
                break;
        case MPI2_RAID_VOL_TYPE_RAID1:
                level = RAID_LEVEL_1;
                break;
        }

        switch (ioc->hba_mpi_version_belonged) {
        case MPI2_VERSION:
                raid_set_level(mpt2sas_raid_template,
                        &sdev->sdev_gendev, level);
                break;
        case MPI25_VERSION:
        case MPI26_VERSION:
                raid_set_level(mpt3sas_raid_template,
                        &sdev->sdev_gendev, level);
                break;
        }
}


/**
 * _scsih_get_volume_capabilities - volume capabilities
 * @ioc: per adapter object
 * @raid_device: the raid_device object
 *
 * Return: 0 for success, else 1
 */
static int
_scsih_get_volume_capabilities(struct MPT3SAS_ADAPTER *ioc,
        struct _raid_device *raid_device)
{
        Mpi2RaidVolPage0_t *vol_pg0;
        Mpi2RaidPhysDiskPage0_t pd_pg0;
        Mpi2SasDevicePage0_t sas_device_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u16 sz;
        u8 num_pds;

        if ((mpt3sas_config_get_number_pds(ioc, raid_device->handle,
            &num_pds)) || !num_pds) {
                dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                    "failure at %s:%d/%s()!\n", ioc->name, __FILE__, __LINE__,
                    __func__));
                return 1;
        }

        raid_device->num_pds = num_pds;
        sz = offsetof(Mpi2RaidVolPage0_t, PhysDisk) + (num_pds *
            sizeof(Mpi2RaidVol0PhysDisk_t));
        vol_pg0 = kzalloc(sz, GFP_KERNEL);
        if (!vol_pg0) {
                dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                    "failure at %s:%d/%s()!\n", ioc->name, __FILE__, __LINE__,
                    __func__));
                return 1;
        }

        if ((mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
             MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
                dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                    "failure at %s:%d/%s()!\n", ioc->name, __FILE__, __LINE__,
                    __func__));
                kfree(vol_pg0);
                return 1;
        }

        raid_device->volume_type = vol_pg0->VolumeType;

        /* figure out what the underlying devices are by
         * obtaining the device_info bits for the 1st device
         */
        if (!(mpt3sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
            &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
            vol_pg0->PhysDisk[0].PhysDiskNum))) {
                if (!(mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply,
                    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
                    le16_to_cpu(pd_pg0.DevHandle)))) {
                        raid_device->device_info =
                            le32_to_cpu(sas_device_pg0.DeviceInfo);
                }
        }

        kfree(vol_pg0);
        return 0;
}

/**
 * _scsih_enable_tlr - setting TLR flags
 * @ioc: per adapter object
 * @sdev: scsi device struct
 *
 * Enabling Transaction Layer Retries for tape devices when
 * vpd page 0x90 is present
 *
 */
static void
_scsih_enable_tlr(struct MPT3SAS_ADAPTER *ioc, struct scsi_device *sdev)
{

        /* only for TAPE */
        if (sdev->type != TYPE_TAPE)
                return;

        if (!(ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_TLR))
                return;

        sas_enable_tlr(sdev);
        sdev_printk(KERN_INFO, sdev, "TLR %s\n",
            sas_is_tlr_enabled(sdev) ? "Enabled" : "Disabled");
        return;

}

/**
 * scsih_slave_configure - device configure routine.
 * @sdev: scsi device struct
 *
 * Return: 0 if ok. Any other return is assumed to be an error and
 * the device is ignored.
 */
static int
scsih_slave_configure(struct scsi_device *sdev)
{
        struct Scsi_Host *shost = sdev->host;
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        struct _sas_device *sas_device;
        struct _pcie_device *pcie_device;
        struct _raid_device *raid_device;
        unsigned long flags;
        int qdepth;
        u8 ssp_target = 0;
        char *ds = "";
        char *r_level = "";
        u16 handle, volume_handle = 0;
        u64 volume_wwid = 0;

        qdepth = 1;
        sas_device_priv_data = sdev->hostdata;
        sas_device_priv_data->configured_lun = 1;
        sas_device_priv_data->flags &= ~MPT_DEVICE_FLAGS_INIT;
        sas_target_priv_data = sas_device_priv_data->sas_target;
        handle = sas_target_priv_data->handle;

        /* raid volume handling */
        if (sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME) {

                spin_lock_irqsave(&ioc->raid_device_lock, flags);
                raid_device = mpt3sas_raid_device_find_by_handle(ioc, handle);
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
                if (!raid_device) {
                        dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                            "failure at %s:%d/%s()!\n", ioc->name, __FILE__,
                            __LINE__, __func__));
                        return 1;
                }

                if (_scsih_get_volume_capabilities(ioc, raid_device)) {
                        dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                            "failure at %s:%d/%s()!\n", ioc->name, __FILE__,
                            __LINE__, __func__));
                        return 1;
                }

                /*
                 * WARPDRIVE: Initialize the required data for Direct IO
                 */
                mpt3sas_init_warpdrive_properties(ioc, raid_device);

                /* RAID Queue Depth Support
                 * IS volume = underlying qdepth of drive type, either
                 *    MPT3SAS_SAS_QUEUE_DEPTH or MPT3SAS_SATA_QUEUE_DEPTH
                 * IM/IME/R10 = 128 (MPT3SAS_RAID_QUEUE_DEPTH)
                 */
                if (raid_device->device_info &
                    MPI2_SAS_DEVICE_INFO_SSP_TARGET) {
                        qdepth = MPT3SAS_SAS_QUEUE_DEPTH;
                        ds = "SSP";
                } else {
                        qdepth = MPT3SAS_SATA_QUEUE_DEPTH;
                        if (raid_device->device_info &
                            MPI2_SAS_DEVICE_INFO_SATA_DEVICE)
                                ds = "SATA";
                        else
                                ds = "STP";
                }

                switch (raid_device->volume_type) {
                case MPI2_RAID_VOL_TYPE_RAID0:
                        r_level = "RAID0";
                        break;
                case MPI2_RAID_VOL_TYPE_RAID1E:
                        qdepth = MPT3SAS_RAID_QUEUE_DEPTH;
                        if (ioc->manu_pg10.OEMIdentifier &&
                            (le32_to_cpu(ioc->manu_pg10.GenericFlags0) &
                            MFG10_GF0_R10_DISPLAY) &&
                            !(raid_device->num_pds % 2))
                                r_level = "RAID10";
                        else
                                r_level = "RAID1E";
                        break;
                case MPI2_RAID_VOL_TYPE_RAID1:
                        qdepth = MPT3SAS_RAID_QUEUE_DEPTH;
                        r_level = "RAID1";
                        break;
                case MPI2_RAID_VOL_TYPE_RAID10:
                        qdepth = MPT3SAS_RAID_QUEUE_DEPTH;
                        r_level = "RAID10";
                        break;
                case MPI2_RAID_VOL_TYPE_UNKNOWN:
                default:
                        qdepth = MPT3SAS_RAID_QUEUE_DEPTH;
                        r_level = "RAIDX";
                        break;
                }

                if (!ioc->hide_ir_msg)
                        sdev_printk(KERN_INFO, sdev,
                           "%s: handle(0x%04x), wwid(0x%016llx),"
                            " pd_count(%d), type(%s)\n",
                            r_level, raid_device->handle,
                            (unsigned long long)raid_device->wwid,
                            raid_device->num_pds, ds);

                if (shost->max_sectors > MPT3SAS_RAID_MAX_SECTORS) {
                        blk_queue_max_hw_sectors(sdev->request_queue,
                                                MPT3SAS_RAID_MAX_SECTORS);
                        sdev_printk(KERN_INFO, sdev,
                                        "Set queue's max_sector to: %u\n",
                                                MPT3SAS_RAID_MAX_SECTORS);
                }

                scsih_change_queue_depth(sdev, qdepth);

                /* raid transport support */
                if (!ioc->is_warpdrive)
                        _scsih_set_level(ioc, sdev, raid_device->volume_type);
                return 0;
        }

        /* non-raid handling */
        if (sas_target_priv_data->flags & MPT_TARGET_FLAGS_RAID_COMPONENT) {
                if (mpt3sas_config_get_volume_handle(ioc, handle,
                    &volume_handle)) {
                        dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                            "failure at %s:%d/%s()!\n", ioc->name,
                            __FILE__, __LINE__, __func__));
                        return 1;
                }
                if (volume_handle && mpt3sas_config_get_volume_wwid(ioc,
                    volume_handle, &volume_wwid)) {
                        dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                            "failure at %s:%d/%s()!\n", ioc->name,
                            __FILE__, __LINE__, __func__));
                        return 1;
                }
        }

        /* PCIe handling */
        if (sas_target_priv_data->flags & MPT_TARGET_FLAGS_PCIE_DEVICE) {
                spin_lock_irqsave(&ioc->pcie_device_lock, flags);
                pcie_device = __mpt3sas_get_pdev_by_wwid(ioc,
                                sas_device_priv_data->sas_target->sas_address);
                if (!pcie_device) {
                        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
                        dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                                "failure at %s:%d/%s()!\n", ioc->name, __FILE__,
                                __LINE__, __func__));
                        return 1;
                }

                qdepth = MPT3SAS_NVME_QUEUE_DEPTH;
                ds = "NVMe";
                sdev_printk(KERN_INFO, sdev,
                        "%s: handle(0x%04x), wwid(0x%016llx), port(%d)\n",
                        ds, handle, (unsigned long long)pcie_device->wwid,
                        pcie_device->port_num);
                if (pcie_device->enclosure_handle != 0)
                        sdev_printk(KERN_INFO, sdev,
                        "%s: enclosure logical id(0x%016llx), slot(%d)\n",
                        ds,
                        (unsigned long long)pcie_device->enclosure_logical_id,
                        pcie_device->slot);
                if (pcie_device->connector_name[0] != '\0')
                        sdev_printk(KERN_INFO, sdev,
                                "%s: enclosure level(0x%04x),"
                                "connector name( %s)\n", ds,
                                pcie_device->enclosure_level,
                                pcie_device->connector_name);

                if (pcie_device->nvme_mdts)
                        blk_queue_max_hw_sectors(sdev->request_queue,
                                        pcie_device->nvme_mdts/512);

                pcie_device_put(pcie_device);
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
                scsih_change_queue_depth(sdev, qdepth);
                /* Enable QUEUE_FLAG_NOMERGES flag, so that IOs won't be
                 ** merged and can eliminate holes created during merging
                 ** operation.
                 **/
                blk_queue_flag_set(QUEUE_FLAG_NOMERGES,
                                sdev->request_queue);
                blk_queue_virt_boundary(sdev->request_queue,
                                ioc->page_size - 1);
                return 0;
        }

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_by_addr(ioc,
           sas_device_priv_data->sas_target->sas_address);
        if (!sas_device) {
                spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
                dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                    "failure at %s:%d/%s()!\n", ioc->name, __FILE__, __LINE__,
                    __func__));
                return 1;
        }

        sas_device->volume_handle = volume_handle;
        sas_device->volume_wwid = volume_wwid;
        if (sas_device->device_info & MPI2_SAS_DEVICE_INFO_SSP_TARGET) {
                qdepth = MPT3SAS_SAS_QUEUE_DEPTH;
                ssp_target = 1;
                if (sas_device->device_info &
                                MPI2_SAS_DEVICE_INFO_SEP) {
                        sdev_printk(KERN_WARNING, sdev,
                        "set ignore_delay_remove for handle(0x%04x)\n",
                        sas_device_priv_data->sas_target->handle);
                        sas_device_priv_data->ignore_delay_remove = 1;
                        ds = "SES";
                } else
                        ds = "SSP";
        } else {
                qdepth = MPT3SAS_SATA_QUEUE_DEPTH;
                if (sas_device->device_info & MPI2_SAS_DEVICE_INFO_STP_TARGET)
                        ds = "STP";
                else if (sas_device->device_info &
                    MPI2_SAS_DEVICE_INFO_SATA_DEVICE)
                        ds = "SATA";
        }

        sdev_printk(KERN_INFO, sdev, "%s: handle(0x%04x), " \
            "sas_addr(0x%016llx), phy(%d), device_name(0x%016llx)\n",
            ds, handle, (unsigned long long)sas_device->sas_address,
            sas_device->phy, (unsigned long long)sas_device->device_name);

        _scsih_display_enclosure_chassis_info(NULL, sas_device, sdev, NULL);

        sas_device_put(sas_device);
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

        if (!ssp_target)
                _scsih_display_sata_capabilities(ioc, handle, sdev);


        scsih_change_queue_depth(sdev, qdepth);

        if (ssp_target) {
                sas_read_port_mode_page(sdev);
                _scsih_enable_tlr(ioc, sdev);
        }

        return 0;
}

/**
 * scsih_bios_param - fetch head, sector, cylinder info for a disk
 * @sdev: scsi device struct
 * @bdev: pointer to block device context
 * @capacity: device size (in 512 byte sectors)
 * @params: three element array to place output:
 *              params[0] number of heads (max 255)
 *              params[1] number of sectors (max 63)
 *              params[2] number of cylinders
 */
static int
scsih_bios_param(struct scsi_device *sdev, struct block_device *bdev,
        sector_t capacity, int params[])
{
        int             heads;
        int             sectors;
        sector_t        cylinders;
        ulong           dummy;

        heads = 64;
        sectors = 32;

        dummy = heads * sectors;
        cylinders = capacity;
        sector_div(cylinders, dummy);

        /*
         * Handle extended translation size for logical drives
         * > 1Gb
         */
        if ((ulong)capacity >= 0x200000) {
                heads = 255;
                sectors = 63;
                dummy = heads * sectors;
                cylinders = capacity;
                sector_div(cylinders, dummy);
        }

        /* return result */
        params[0] = heads;
        params[1] = sectors;
        params[2] = cylinders;

        return 0;
}

/**
 * _scsih_response_code - translation of device response code
 * @ioc: per adapter object
 * @response_code: response code returned by the device
 */
static void
_scsih_response_code(struct MPT3SAS_ADAPTER *ioc, u8 response_code)
{
        char *desc;

        switch (response_code) {
        case MPI2_SCSITASKMGMT_RSP_TM_COMPLETE:
                desc = "task management request completed";
                break;
        case MPI2_SCSITASKMGMT_RSP_INVALID_FRAME:
                desc = "invalid frame";
                break;
        case MPI2_SCSITASKMGMT_RSP_TM_NOT_SUPPORTED:
                desc = "task management request not supported";
                break;
        case MPI2_SCSITASKMGMT_RSP_TM_FAILED:
                desc = "task management request failed";
                break;
        case MPI2_SCSITASKMGMT_RSP_TM_SUCCEEDED:
                desc = "task management request succeeded";
                break;
        case MPI2_SCSITASKMGMT_RSP_TM_INVALID_LUN:
                desc = "invalid lun";
                break;
        case 0xA:
                desc = "overlapped tag attempted";
                break;
        case MPI2_SCSITASKMGMT_RSP_IO_QUEUED_ON_IOC:
                desc = "task queued, however not sent to target";
                break;
        default:
                desc = "unknown";
                break;
        }
        pr_warn(MPT3SAS_FMT "response_code(0x%01x): %s\n",
                ioc->name, response_code, desc);
}

/**
 * _scsih_tm_done - tm completion routine
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 * Context: none.
 *
 * The callback handler when using scsih_issue_tm.
 *
 * Return: 1 meaning mf should be freed from _base_interrupt
 *         0 means the mf is freed from this function.
 */
static u8
_scsih_tm_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
{
        MPI2DefaultReply_t *mpi_reply;

        if (ioc->tm_cmds.status == MPT3_CMD_NOT_USED)
                return 1;
        if (ioc->tm_cmds.smid != smid)
                return 1;
        ioc->tm_cmds.status |= MPT3_CMD_COMPLETE;
        mpi_reply =  mpt3sas_base_get_reply_virt_addr(ioc, reply);
        if (mpi_reply) {
                memcpy(ioc->tm_cmds.reply, mpi_reply, mpi_reply->MsgLength*4);
                ioc->tm_cmds.status |= MPT3_CMD_REPLY_VALID;
        }
        ioc->tm_cmds.status &= ~MPT3_CMD_PENDING;
        complete(&ioc->tm_cmds.done);
        return 1;
}

/**
 * mpt3sas_scsih_set_tm_flag - set per target tm_busy
 * @ioc: per adapter object
 * @handle: device handle
 *
 * During taskmangement request, we need to freeze the device queue.
 */
void
mpt3sas_scsih_set_tm_flag(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct scsi_device *sdev;
        u8 skip = 0;

        shost_for_each_device(sdev, ioc->shost) {
                if (skip)
                        continue;
                sas_device_priv_data = sdev->hostdata;
                if (!sas_device_priv_data)
                        continue;
                if (sas_device_priv_data->sas_target->handle == handle) {
                        sas_device_priv_data->sas_target->tm_busy = 1;
                        skip = 1;
                        ioc->ignore_loginfos = 1;
                }
        }
}

/**
 * mpt3sas_scsih_clear_tm_flag - clear per target tm_busy
 * @ioc: per adapter object
 * @handle: device handle
 *
 * During taskmangement request, we need to freeze the device queue.
 */
void
mpt3sas_scsih_clear_tm_flag(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct scsi_device *sdev;
        u8 skip = 0;

        shost_for_each_device(sdev, ioc->shost) {
                if (skip)
                        continue;
                sas_device_priv_data = sdev->hostdata;
                if (!sas_device_priv_data)
                        continue;
                if (sas_device_priv_data->sas_target->handle == handle) {
                        sas_device_priv_data->sas_target->tm_busy = 0;
                        skip = 1;
                        ioc->ignore_loginfos = 0;
                }
        }
}

/**
 * mpt3sas_scsih_issue_tm - main routine for sending tm requests
 * @ioc: per adapter struct
 * @handle: device handle
 * @lun: lun number
 * @type: MPI2_SCSITASKMGMT_TASKTYPE__XXX (defined in mpi2_init.h)
 * @smid_task: smid assigned to the task
 * @msix_task: MSIX table index supplied by the OS
 * @timeout: timeout in seconds
 * @tr_method: Target Reset Method
 * Context: user
 *
 * A generic API for sending task management requests to firmware.
 *
 * The callback index is set inside `ioc->tm_cb_idx`.
 * The caller is responsible to check for outstanding commands.
 *
 * Return: SUCCESS or FAILED.
 */
int
mpt3sas_scsih_issue_tm(struct MPT3SAS_ADAPTER *ioc, u16 handle, u64 lun,
        u8 type, u16 smid_task, u16 msix_task, u8 timeout, u8 tr_method)
{
        Mpi2SCSITaskManagementRequest_t *mpi_request;
        Mpi2SCSITaskManagementReply_t *mpi_reply;
        u16 smid = 0;
        u32 ioc_state;
        int rc;

        lockdep_assert_held(&ioc->tm_cmds.mutex);

        if (ioc->tm_cmds.status != MPT3_CMD_NOT_USED) {
                pr_info(MPT3SAS_FMT "%s: tm_cmd busy!!!\n",
                    __func__, ioc->name);
                return FAILED;
        }

        if (ioc->shost_recovery || ioc->remove_host ||
            ioc->pci_error_recovery) {
                pr_info(MPT3SAS_FMT "%s: host reset in progress!\n",
                    __func__, ioc->name);
                return FAILED;
        }

        ioc_state = mpt3sas_base_get_iocstate(ioc, 0);
        if (ioc_state & MPI2_DOORBELL_USED) {
                dhsprintk(ioc, pr_info(MPT3SAS_FMT
                        "unexpected doorbell active!\n", ioc->name));
                rc = mpt3sas_base_hard_reset_handler(ioc, FORCE_BIG_HAMMER);
                return (!rc) ? SUCCESS : FAILED;
        }

        if ((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT) {
                mpt3sas_base_fault_info(ioc, ioc_state &
                    MPI2_DOORBELL_DATA_MASK);
                rc = mpt3sas_base_hard_reset_handler(ioc, FORCE_BIG_HAMMER);
                return (!rc) ? SUCCESS : FAILED;
        }

        smid = mpt3sas_base_get_smid_hpr(ioc, ioc->tm_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                return FAILED;
        }

        dtmprintk(ioc, pr_info(MPT3SAS_FMT
                "sending tm: handle(0x%04x), task_type(0x%02x), smid(%d), timeout(%d), tr_method(0x%x)\n",
                ioc->name, handle, type, smid_task, timeout, tr_method));
        ioc->tm_cmds.status = MPT3_CMD_PENDING;
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->tm_cmds.smid = smid;
        memset(mpi_request, 0, sizeof(Mpi2SCSITaskManagementRequest_t));
        memset(ioc->tm_cmds.reply, 0, sizeof(Mpi2SCSITaskManagementReply_t));
        mpi_request->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
        mpi_request->DevHandle = cpu_to_le16(handle);
        mpi_request->TaskType = type;
        mpi_request->MsgFlags = tr_method;
        mpi_request->TaskMID = cpu_to_le16(smid_task);
        int_to_scsilun(lun, (struct scsi_lun *)mpi_request->LUN);
        mpt3sas_scsih_set_tm_flag(ioc, handle);
        init_completion(&ioc->tm_cmds.done);
        mpt3sas_base_put_smid_hi_priority(ioc, smid, msix_task);
        wait_for_completion_timeout(&ioc->tm_cmds.done, timeout*HZ);
        if (!(ioc->tm_cmds.status & MPT3_CMD_COMPLETE)) {
                if (mpt3sas_base_check_cmd_timeout(ioc,
                        ioc->tm_cmds.status, mpi_request,
                        sizeof(Mpi2SCSITaskManagementRequest_t)/4)) {
                        rc = mpt3sas_base_hard_reset_handler(ioc,
                                        FORCE_BIG_HAMMER);
                        rc = (!rc) ? SUCCESS : FAILED;
                        goto out;
                }
        }

        /* sync IRQs in case those were busy during flush. */
        mpt3sas_base_sync_reply_irqs(ioc);

        if (ioc->tm_cmds.status & MPT3_CMD_REPLY_VALID) {
                mpt3sas_trigger_master(ioc, MASTER_TRIGGER_TASK_MANAGMENT);
                mpi_reply = ioc->tm_cmds.reply;
                dtmprintk(ioc, pr_info(MPT3SAS_FMT "complete tm: " \
                    "ioc_status(0x%04x), loginfo(0x%08x), term_count(0x%08x)\n",
                    ioc->name, le16_to_cpu(mpi_reply->IOCStatus),
                    le32_to_cpu(mpi_reply->IOCLogInfo),
                    le32_to_cpu(mpi_reply->TerminationCount)));
                if (ioc->logging_level & MPT_DEBUG_TM) {
                        _scsih_response_code(ioc, mpi_reply->ResponseCode);
                        if (mpi_reply->IOCStatus)
                                _debug_dump_mf(mpi_request,
                                    sizeof(Mpi2SCSITaskManagementRequest_t)/4);
                }
        }
        rc = SUCCESS;

out:
        mpt3sas_scsih_clear_tm_flag(ioc, handle);
        ioc->tm_cmds.status = MPT3_CMD_NOT_USED;
        return rc;
}

int mpt3sas_scsih_issue_locked_tm(struct MPT3SAS_ADAPTER *ioc, u16 handle,
                u64 lun, u8 type, u16 smid_task, u16 msix_task,
                u8 timeout, u8 tr_method)
{
        int ret;

        mutex_lock(&ioc->tm_cmds.mutex);
        ret = mpt3sas_scsih_issue_tm(ioc, handle, lun, type, smid_task,
                        msix_task, timeout, tr_method);
        mutex_unlock(&ioc->tm_cmds.mutex);

        return ret;
}

/**
 * _scsih_tm_display_info - displays info about the device
 * @ioc: per adapter struct
 * @scmd: pointer to scsi command object
 *
 * Called by task management callback handlers.
 */
static void
_scsih_tm_display_info(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd)
{
        struct scsi_target *starget = scmd->device->sdev_target;
        struct MPT3SAS_TARGET *priv_target = starget->hostdata;
        struct _sas_device *sas_device = NULL;
        struct _pcie_device *pcie_device = NULL;
        unsigned long flags;
        char *device_str = NULL;

        if (!priv_target)
                return;
        if (ioc->hide_ir_msg)
                device_str = "WarpDrive";
        else
                device_str = "volume";

        scsi_print_command(scmd);
        if (priv_target->flags & MPT_TARGET_FLAGS_VOLUME) {
                starget_printk(KERN_INFO, starget,
                        "%s handle(0x%04x), %s wwid(0x%016llx)\n",
                        device_str, priv_target->handle,
                    device_str, (unsigned long long)priv_target->sas_address);

        } else if (priv_target->flags & MPT_TARGET_FLAGS_PCIE_DEVICE) {
                spin_lock_irqsave(&ioc->pcie_device_lock, flags);
                pcie_device = __mpt3sas_get_pdev_from_target(ioc, priv_target);
                if (pcie_device) {
                        starget_printk(KERN_INFO, starget,
                                "handle(0x%04x), wwid(0x%016llx), port(%d)\n",
                                pcie_device->handle,
                                (unsigned long long)pcie_device->wwid,
                                pcie_device->port_num);
                        if (pcie_device->enclosure_handle != 0)
                                starget_printk(KERN_INFO, starget,
                                        "enclosure logical id(0x%016llx), slot(%d)\n",
                                        (unsigned long long)
                                        pcie_device->enclosure_logical_id,
                                        pcie_device->slot);
                        if (pcie_device->connector_name[0] != '\0')
                                starget_printk(KERN_INFO, starget,
                                        "enclosure level(0x%04x), connector name( %s)\n",
                                        pcie_device->enclosure_level,
                                        pcie_device->connector_name);
                        pcie_device_put(pcie_device);
                }
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

        } else {
                spin_lock_irqsave(&ioc->sas_device_lock, flags);
                sas_device = __mpt3sas_get_sdev_from_target(ioc, priv_target);
                if (sas_device) {
                        if (priv_target->flags &
                            MPT_TARGET_FLAGS_RAID_COMPONENT) {
                                starget_printk(KERN_INFO, starget,
                                    "volume handle(0x%04x), "
                                    "volume wwid(0x%016llx)\n",
                                    sas_device->volume_handle,
                                   (unsigned long long)sas_device->volume_wwid);
                        }
                        starget_printk(KERN_INFO, starget,
                            "handle(0x%04x), sas_address(0x%016llx), phy(%d)\n",
                            sas_device->handle,
                            (unsigned long long)sas_device->sas_address,
                            sas_device->phy);

                        _scsih_display_enclosure_chassis_info(NULL, sas_device,
                            NULL, starget);

                        sas_device_put(sas_device);
                }
                spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        }
}

/**
 * scsih_abort - eh threads main abort routine
 * @scmd: pointer to scsi command object
 *
 * Return: SUCCESS if command aborted else FAILED
 */
static int
scsih_abort(struct scsi_cmnd *scmd)
{
        struct MPT3SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct scsiio_tracker *st = scsi_cmd_priv(scmd);
        u16 handle;
        int r;

        u8 timeout = 30;
        struct _pcie_device *pcie_device = NULL;
        sdev_printk(KERN_INFO, scmd->device,
                "attempting task abort! scmd(%p)\n", scmd);
        _scsih_tm_display_info(ioc, scmd);

        sas_device_priv_data = scmd->device->hostdata;
        if (!sas_device_priv_data || !sas_device_priv_data->sas_target ||
            ioc->remove_host) {
                sdev_printk(KERN_INFO, scmd->device,
                        "device been deleted! scmd(%p)\n", scmd);
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                r = SUCCESS;
                goto out;
        }

        /* check for completed command */
        if (st == NULL || st->cb_idx == 0xFF) {
                scmd->result = DID_RESET << 16;
                r = SUCCESS;
                goto out;
        }

        /* for hidden raid components and volumes this is not supported */
        if (sas_device_priv_data->sas_target->flags &
            MPT_TARGET_FLAGS_RAID_COMPONENT ||
            sas_device_priv_data->sas_target->flags & MPT_TARGET_FLAGS_VOLUME) {
                scmd->result = DID_RESET << 16;
                r = FAILED;
                goto out;
        }

        mpt3sas_halt_firmware(ioc);

        handle = sas_device_priv_data->sas_target->handle;
        pcie_device = mpt3sas_get_pdev_by_handle(ioc, handle);
        if (pcie_device && (!ioc->tm_custom_handling))
                timeout = ioc->nvme_abort_timeout;
        r = mpt3sas_scsih_issue_locked_tm(ioc, handle, scmd->device->lun,
                MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK,
                st->smid, st->msix_io, timeout, 0);
        /* Command must be cleared after abort */
        if (r == SUCCESS && st->cb_idx != 0xFF)
                r = FAILED;
 out:
        sdev_printk(KERN_INFO, scmd->device, "task abort: %s scmd(%p)\n",
            ((r == SUCCESS) ? "SUCCESS" : "FAILED"), scmd);
        if (pcie_device)
                pcie_device_put(pcie_device);
        return r;
}

/**
 * scsih_dev_reset - eh threads main device reset routine
 * @scmd: pointer to scsi command object
 *
 * Return: SUCCESS if command aborted else FAILED
 */
static int
scsih_dev_reset(struct scsi_cmnd *scmd)
{
        struct MPT3SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct _sas_device *sas_device = NULL;
        struct _pcie_device *pcie_device = NULL;
        u16     handle;
        u8      tr_method = 0;
        u8      tr_timeout = 30;
        int r;

        struct scsi_target *starget = scmd->device->sdev_target;
        struct MPT3SAS_TARGET *target_priv_data = starget->hostdata;

        sdev_printk(KERN_INFO, scmd->device,
                "attempting device reset! scmd(%p)\n", scmd);
        _scsih_tm_display_info(ioc, scmd);

        sas_device_priv_data = scmd->device->hostdata;
        if (!sas_device_priv_data || !sas_device_priv_data->sas_target ||
            ioc->remove_host) {
                sdev_printk(KERN_INFO, scmd->device,
                        "device been deleted! scmd(%p)\n", scmd);
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                r = SUCCESS;
                goto out;
        }

        /* for hidden raid components obtain the volume_handle */
        handle = 0;
        if (sas_device_priv_data->sas_target->flags &
            MPT_TARGET_FLAGS_RAID_COMPONENT) {
                sas_device = mpt3sas_get_sdev_from_target(ioc,
                                target_priv_data);
                if (sas_device)
                        handle = sas_device->volume_handle;
        } else
                handle = sas_device_priv_data->sas_target->handle;

        if (!handle) {
                scmd->result = DID_RESET << 16;
                r = FAILED;
                goto out;
        }

        pcie_device = mpt3sas_get_pdev_by_handle(ioc, handle);

        if (pcie_device && (!ioc->tm_custom_handling)) {
                tr_timeout = pcie_device->reset_timeout;
                tr_method = MPI26_SCSITASKMGMT_MSGFLAGS_PROTOCOL_LVL_RST_PCIE;
        } else
                tr_method = MPI2_SCSITASKMGMT_MSGFLAGS_LINK_RESET;
        r = mpt3sas_scsih_issue_locked_tm(ioc, handle, scmd->device->lun,
                MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET, 0, 0,
                tr_timeout, tr_method);
        /* Check for busy commands after reset */
        if (r == SUCCESS && atomic_read(&scmd->device->device_busy))
                r = FAILED;
 out:
        sdev_printk(KERN_INFO, scmd->device, "device reset: %s scmd(%p)\n",
            ((r == SUCCESS) ? "SUCCESS" : "FAILED"), scmd);

        if (sas_device)
                sas_device_put(sas_device);
        if (pcie_device)
                pcie_device_put(pcie_device);

        return r;
}

/**
 * scsih_target_reset - eh threads main target reset routine
 * @scmd: pointer to scsi command object
 *
 * Return: SUCCESS if command aborted else FAILED
 */
static int
scsih_target_reset(struct scsi_cmnd *scmd)
{
        struct MPT3SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct _sas_device *sas_device = NULL;
        struct _pcie_device *pcie_device = NULL;
        u16     handle;
        u8      tr_method = 0;
        u8      tr_timeout = 30;
        int r;
        struct scsi_target *starget = scmd->device->sdev_target;
        struct MPT3SAS_TARGET *target_priv_data = starget->hostdata;

        starget_printk(KERN_INFO, starget, "attempting target reset! scmd(%p)\n",
                scmd);
        _scsih_tm_display_info(ioc, scmd);

        sas_device_priv_data = scmd->device->hostdata;
        if (!sas_device_priv_data || !sas_device_priv_data->sas_target ||
            ioc->remove_host) {
                starget_printk(KERN_INFO, starget, "target been deleted! scmd(%p)\n",
                        scmd);
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                r = SUCCESS;
                goto out;
        }

        /* for hidden raid components obtain the volume_handle */
        handle = 0;
        if (sas_device_priv_data->sas_target->flags &
            MPT_TARGET_FLAGS_RAID_COMPONENT) {
                sas_device = mpt3sas_get_sdev_from_target(ioc,
                                target_priv_data);
                if (sas_device)
                        handle = sas_device->volume_handle;
        } else
                handle = sas_device_priv_data->sas_target->handle;

        if (!handle) {
                scmd->result = DID_RESET << 16;
                r = FAILED;
                goto out;
        }

        pcie_device = mpt3sas_get_pdev_by_handle(ioc, handle);

        if (pcie_device && (!ioc->tm_custom_handling)) {
                tr_timeout = pcie_device->reset_timeout;
                tr_method = MPI26_SCSITASKMGMT_MSGFLAGS_PROTOCOL_LVL_RST_PCIE;
        } else
                tr_method = MPI2_SCSITASKMGMT_MSGFLAGS_LINK_RESET;
        r = mpt3sas_scsih_issue_locked_tm(ioc, handle, 0,
                MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0, 0,
            tr_timeout, tr_method);
        /* Check for busy commands after reset */
        if (r == SUCCESS && atomic_read(&starget->target_busy))
                r = FAILED;
 out:
        starget_printk(KERN_INFO, starget, "target reset: %s scmd(%p)\n",
            ((r == SUCCESS) ? "SUCCESS" : "FAILED"), scmd);

        if (sas_device)
                sas_device_put(sas_device);
        if (pcie_device)
                pcie_device_put(pcie_device);
        return r;
}


/**
 * scsih_host_reset - eh threads main host reset routine
 * @scmd: pointer to scsi command object
 *
 * Return: SUCCESS if command aborted else FAILED
 */
static int
scsih_host_reset(struct scsi_cmnd *scmd)
{
        struct MPT3SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
        int r, retval;

        pr_info(MPT3SAS_FMT "attempting host reset! scmd(%p)\n",
            ioc->name, scmd);
        scsi_print_command(scmd);

        if (ioc->is_driver_loading || ioc->remove_host) {
                pr_info(MPT3SAS_FMT "Blocking the host reset\n",
                    ioc->name);
                r = FAILED;
                goto out;
        }

        retval = mpt3sas_base_hard_reset_handler(ioc, FORCE_BIG_HAMMER);
        r = (retval < 0) ? FAILED : SUCCESS;
out:
        pr_info(MPT3SAS_FMT "host reset: %s scmd(%p)\n",
            ioc->name, ((r == SUCCESS) ? "SUCCESS" : "FAILED"), scmd);

        return r;
}

/**
 * _scsih_fw_event_add - insert and queue up fw_event
 * @ioc: per adapter object
 * @fw_event: object describing the event
 * Context: This function will acquire ioc->fw_event_lock.
 *
 * This adds the firmware event object into link list, then queues it up to
 * be processed from user context.
 */
static void
_scsih_fw_event_add(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work *fw_event)
{
        unsigned long flags;

        if (ioc->firmware_event_thread == NULL)
                return;

        spin_lock_irqsave(&ioc->fw_event_lock, flags);
        fw_event_work_get(fw_event);
        INIT_LIST_HEAD(&fw_event->list);
        list_add_tail(&fw_event->list, &ioc->fw_event_list);
        INIT_WORK(&fw_event->work, _firmware_event_work);
        fw_event_work_get(fw_event);
        queue_work(ioc->firmware_event_thread, &fw_event->work);
        spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
}

/**
 * _scsih_fw_event_del_from_list - delete fw_event from the list
 * @ioc: per adapter object
 * @fw_event: object describing the event
 * Context: This function will acquire ioc->fw_event_lock.
 *
 * If the fw_event is on the fw_event_list, remove it and do a put.
 */
static void
_scsih_fw_event_del_from_list(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work
        *fw_event)
{
        unsigned long flags;

        spin_lock_irqsave(&ioc->fw_event_lock, flags);
        if (!list_empty(&fw_event->list)) {
                list_del_init(&fw_event->list);
                fw_event_work_put(fw_event);
        }
        spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
}


 /**
 * mpt3sas_send_trigger_data_event - send event for processing trigger data
 * @ioc: per adapter object
 * @event_data: trigger event data
 */
void
mpt3sas_send_trigger_data_event(struct MPT3SAS_ADAPTER *ioc,
        struct SL_WH_TRIGGERS_EVENT_DATA_T *event_data)
{
        struct fw_event_work *fw_event;
        u16 sz;

        if (ioc->is_driver_loading)
                return;
        sz = sizeof(*event_data);
        fw_event = alloc_fw_event_work(sz);
        if (!fw_event)
                return;
        fw_event->event = MPT3SAS_PROCESS_TRIGGER_DIAG;
        fw_event->ioc = ioc;
        memcpy(fw_event->event_data, event_data, sizeof(*event_data));
        _scsih_fw_event_add(ioc, fw_event);
        fw_event_work_put(fw_event);
}

/**
 * _scsih_error_recovery_delete_devices - remove devices not responding
 * @ioc: per adapter object
 */
static void
_scsih_error_recovery_delete_devices(struct MPT3SAS_ADAPTER *ioc)
{
        struct fw_event_work *fw_event;

        if (ioc->is_driver_loading)
                return;
        fw_event = alloc_fw_event_work(0);
        if (!fw_event)
                return;
        fw_event->event = MPT3SAS_REMOVE_UNRESPONDING_DEVICES;
        fw_event->ioc = ioc;
        _scsih_fw_event_add(ioc, fw_event);
        fw_event_work_put(fw_event);
}

/**
 * mpt3sas_port_enable_complete - port enable completed (fake event)
 * @ioc: per adapter object
 */
void
mpt3sas_port_enable_complete(struct MPT3SAS_ADAPTER *ioc)
{
        struct fw_event_work *fw_event;

        fw_event = alloc_fw_event_work(0);
        if (!fw_event)
                return;
        fw_event->event = MPT3SAS_PORT_ENABLE_COMPLETE;
        fw_event->ioc = ioc;
        _scsih_fw_event_add(ioc, fw_event);
        fw_event_work_put(fw_event);
}

static struct fw_event_work *dequeue_next_fw_event(struct MPT3SAS_ADAPTER *ioc)
{
        unsigned long flags;
        struct fw_event_work *fw_event = NULL;

        spin_lock_irqsave(&ioc->fw_event_lock, flags);
        if (!list_empty(&ioc->fw_event_list)) {
                fw_event = list_first_entry(&ioc->fw_event_list,
                                struct fw_event_work, list);
                list_del_init(&fw_event->list);
        }
        spin_unlock_irqrestore(&ioc->fw_event_lock, flags);

        return fw_event;
}

/**
 * _scsih_fw_event_cleanup_queue - cleanup event queue
 * @ioc: per adapter object
 *
 * Walk the firmware event queue, either killing timers, or waiting
 * for outstanding events to complete
 */
static void
_scsih_fw_event_cleanup_queue(struct MPT3SAS_ADAPTER *ioc)
{
        struct fw_event_work *fw_event;

        if (list_empty(&ioc->fw_event_list) ||
             !ioc->firmware_event_thread || in_interrupt())
                return;

        while ((fw_event = dequeue_next_fw_event(ioc))) {
                /*
                 * Wait on the fw_event to complete. If this returns 1, then
                 * the event was never executed, and we need a put for the
                 * reference the work had on the fw_event.
                 *
                 * If it did execute, we wait for it to finish, and the put will
                 * happen from _firmware_event_work()
                 */
                if (cancel_work_sync(&fw_event->work))
                        fw_event_work_put(fw_event);

                fw_event_work_put(fw_event);
        }
}

/**
 * _scsih_internal_device_block - block the sdev device
 * @sdev: per device object
 * @sas_device_priv_data : per device driver private data
 *
 * make sure device is blocked without error, if not
 * print an error
 */
static void
_scsih_internal_device_block(struct scsi_device *sdev,
                        struct MPT3SAS_DEVICE *sas_device_priv_data)
{
        int r = 0;

        sdev_printk(KERN_INFO, sdev, "device_block, handle(0x%04x)\n",
            sas_device_priv_data->sas_target->handle);
        sas_device_priv_data->block = 1;

        r = scsi_internal_device_block_nowait(sdev);
        if (r == -EINVAL)
                sdev_printk(KERN_WARNING, sdev,
                    "device_block failed with return(%d) for handle(0x%04x)\n",
                    r, sas_device_priv_data->sas_target->handle);
}

/**
 * _scsih_internal_device_unblock - unblock the sdev device
 * @sdev: per device object
 * @sas_device_priv_data : per device driver private data
 * make sure device is unblocked without error, if not retry
 * by blocking and then unblocking
 */

static void
_scsih_internal_device_unblock(struct scsi_device *sdev,
                        struct MPT3SAS_DEVICE *sas_device_priv_data)
{
        int r = 0;

        sdev_printk(KERN_WARNING, sdev, "device_unblock and setting to running, "
            "handle(0x%04x)\n", sas_device_priv_data->sas_target->handle);
        sas_device_priv_data->block = 0;
        r = scsi_internal_device_unblock_nowait(sdev, SDEV_RUNNING);
        if (r == -EINVAL) {
                /* The device has been set to SDEV_RUNNING by SD layer during
                 * device addition but the request queue is still stopped by
                 * our earlier block call. We need to perform a block again
                 * to get the device to SDEV_BLOCK and then to SDEV_RUNNING */

                sdev_printk(KERN_WARNING, sdev,
                    "device_unblock failed with return(%d) for handle(0x%04x) "
                    "performing a block followed by an unblock\n",
                    r, sas_device_priv_data->sas_target->handle);
                sas_device_priv_data->block = 1;
                r = scsi_internal_device_block_nowait(sdev);
                if (r)
                        sdev_printk(KERN_WARNING, sdev, "retried device_block "
                            "failed with return(%d) for handle(0x%04x)\n",
                            r, sas_device_priv_data->sas_target->handle);

                sas_device_priv_data->block = 0;
                r = scsi_internal_device_unblock_nowait(sdev, SDEV_RUNNING);
                if (r)
                        sdev_printk(KERN_WARNING, sdev, "retried device_unblock"
                            " failed with return(%d) for handle(0x%04x)\n",
                            r, sas_device_priv_data->sas_target->handle);
        }
}

/**
 * _scsih_ublock_io_all_device - unblock every device
 * @ioc: per adapter object
 *
 * change the device state from block to running
 */
static void
_scsih_ublock_io_all_device(struct MPT3SAS_ADAPTER *ioc)
{
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct scsi_device *sdev;

        shost_for_each_device(sdev, ioc->shost) {
                sas_device_priv_data = sdev->hostdata;
                if (!sas_device_priv_data)
                        continue;
                if (!sas_device_priv_data->block)
                        continue;

                dewtprintk(ioc, sdev_printk(KERN_INFO, sdev,
                        "device_running, handle(0x%04x)\n",
                    sas_device_priv_data->sas_target->handle));
                _scsih_internal_device_unblock(sdev, sas_device_priv_data);
        }
}


/**
 * _scsih_ublock_io_device - prepare device to be deleted
 * @ioc: per adapter object
 * @sas_address: sas address
 *
 * unblock then put device in offline state
 */
static void
_scsih_ublock_io_device(struct MPT3SAS_ADAPTER *ioc, u64 sas_address)
{
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct scsi_device *sdev;

        shost_for_each_device(sdev, ioc->shost) {
                sas_device_priv_data = sdev->hostdata;
                if (!sas_device_priv_data)
                        continue;
                if (sas_device_priv_data->sas_target->sas_address
                    != sas_address)
                        continue;
                if (sas_device_priv_data->block)
                        _scsih_internal_device_unblock(sdev,
                                sas_device_priv_data);
        }
}

/**
 * _scsih_block_io_all_device - set the device state to SDEV_BLOCK
 * @ioc: per adapter object
 *
 * During device pull we need to appropriately set the sdev state.
 */
static void
_scsih_block_io_all_device(struct MPT3SAS_ADAPTER *ioc)
{
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct scsi_device *sdev;

        shost_for_each_device(sdev, ioc->shost) {
                sas_device_priv_data = sdev->hostdata;
                if (!sas_device_priv_data)
                        continue;
                if (sas_device_priv_data->block)
                        continue;
                if (sas_device_priv_data->ignore_delay_remove) {
                        sdev_printk(KERN_INFO, sdev,
                        "%s skip device_block for SES handle(0x%04x)\n",
                        __func__, sas_device_priv_data->sas_target->handle);
                        continue;
                }
                _scsih_internal_device_block(sdev, sas_device_priv_data);
        }
}

/**
 * _scsih_block_io_device - set the device state to SDEV_BLOCK
 * @ioc: per adapter object
 * @handle: device handle
 *
 * During device pull we need to appropriately set the sdev state.
 */
static void
_scsih_block_io_device(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct scsi_device *sdev;
        struct _sas_device *sas_device;

        sas_device = mpt3sas_get_sdev_by_handle(ioc, handle);

        shost_for_each_device(sdev, ioc->shost) {
                sas_device_priv_data = sdev->hostdata;
                if (!sas_device_priv_data)
                        continue;
                if (sas_device_priv_data->sas_target->handle != handle)
                        continue;
                if (sas_device_priv_data->block)
                        continue;
                if (sas_device && sas_device->pend_sas_rphy_add)
                        continue;
                if (sas_device_priv_data->ignore_delay_remove) {
                        sdev_printk(KERN_INFO, sdev,
                        "%s skip device_block for SES handle(0x%04x)\n",
                        __func__, sas_device_priv_data->sas_target->handle);
                        continue;
                }
                _scsih_internal_device_block(sdev, sas_device_priv_data);
        }

        if (sas_device)
                sas_device_put(sas_device);
}

/**
 * _scsih_block_io_to_children_attached_to_ex
 * @ioc: per adapter object
 * @sas_expander: the sas_device object
 *
 * This routine set sdev state to SDEV_BLOCK for all devices
 * attached to this expander. This function called when expander is
 * pulled.
 */
static void
_scsih_block_io_to_children_attached_to_ex(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_node *sas_expander)
{
        struct _sas_port *mpt3sas_port;
        struct _sas_device *sas_device;
        struct _sas_node *expander_sibling;
        unsigned long flags;

        if (!sas_expander)
                return;

        list_for_each_entry(mpt3sas_port,
           &sas_expander->sas_port_list, port_list) {
                if (mpt3sas_port->remote_identify.device_type ==
                    SAS_END_DEVICE) {
                        spin_lock_irqsave(&ioc->sas_device_lock, flags);
                        sas_device = __mpt3sas_get_sdev_by_addr(ioc,
                            mpt3sas_port->remote_identify.sas_address);
                        if (sas_device) {
                                set_bit(sas_device->handle,
                                                ioc->blocking_handles);
                                sas_device_put(sas_device);
                        }
                        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
                }
        }

        list_for_each_entry(mpt3sas_port,
           &sas_expander->sas_port_list, port_list) {

                if (mpt3sas_port->remote_identify.device_type ==
                    SAS_EDGE_EXPANDER_DEVICE ||
                    mpt3sas_port->remote_identify.device_type ==
                    SAS_FANOUT_EXPANDER_DEVICE) {
                        expander_sibling =
                            mpt3sas_scsih_expander_find_by_sas_address(
                            ioc, mpt3sas_port->remote_identify.sas_address);
                        _scsih_block_io_to_children_attached_to_ex(ioc,
                            expander_sibling);
                }
        }
}

/**
 * _scsih_block_io_to_children_attached_directly
 * @ioc: per adapter object
 * @event_data: topology change event data
 *
 * This routine set sdev state to SDEV_BLOCK for all devices
 * direct attached during device pull.
 */
static void
_scsih_block_io_to_children_attached_directly(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataSasTopologyChangeList_t *event_data)
{
        int i;
        u16 handle;
        u16 reason_code;

        for (i = 0; i < event_data->NumEntries; i++) {
                handle = le16_to_cpu(event_data->PHY[i].AttachedDevHandle);
                if (!handle)
                        continue;
                reason_code = event_data->PHY[i].PhyStatus &
                    MPI2_EVENT_SAS_TOPO_RC_MASK;
                if (reason_code == MPI2_EVENT_SAS_TOPO_RC_DELAY_NOT_RESPONDING)
                        _scsih_block_io_device(ioc, handle);
        }
}

/**
 * _scsih_block_io_to_pcie_children_attached_directly
 * @ioc: per adapter object
 * @event_data: topology change event data
 *
 * This routine set sdev state to SDEV_BLOCK for all devices
 * direct attached during device pull/reconnect.
 */
static void
_scsih_block_io_to_pcie_children_attached_directly(struct MPT3SAS_ADAPTER *ioc,
                Mpi26EventDataPCIeTopologyChangeList_t *event_data)
{
        int i;
        u16 handle;
        u16 reason_code;

        for (i = 0; i < event_data->NumEntries; i++) {
                handle =
                        le16_to_cpu(event_data->PortEntry[i].AttachedDevHandle);
                if (!handle)
                        continue;
                reason_code = event_data->PortEntry[i].PortStatus;
                if (reason_code ==
                                MPI26_EVENT_PCIE_TOPO_PS_DELAY_NOT_RESPONDING)
                        _scsih_block_io_device(ioc, handle);
        }
}
/**
 * _scsih_tm_tr_send - send task management request
 * @ioc: per adapter object
 * @handle: device handle
 * Context: interrupt time.
 *
 * This code is to initiate the device removal handshake protocol
 * with controller firmware.  This function will issue target reset
 * using high priority request queue.  It will send a sas iounit
 * control request (MPI2_SAS_OP_REMOVE_DEVICE) from this completion.
 *
 * This is designed to send muliple task management request at the same
 * time to the fifo. If the fifo is full, we will append the request,
 * and process it in a future completion.
 */
static void
_scsih_tm_tr_send(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        Mpi2SCSITaskManagementRequest_t *mpi_request;
        u16 smid;
        struct _sas_device *sas_device = NULL;
        struct _pcie_device *pcie_device = NULL;
        struct MPT3SAS_TARGET *sas_target_priv_data = NULL;
        u64 sas_address = 0;
        unsigned long flags;
        struct _tr_list *delayed_tr;
        u32 ioc_state;
        u8 tr_method = 0;

        if (ioc->pci_error_recovery) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: host in pci error recovery: handle(0x%04x)\n",
                        __func__, ioc->name,
                    handle));
                return;
        }
        ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
        if (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: host is not operational: handle(0x%04x)\n",
                        __func__, ioc->name,
                   handle));
                return;
        }

        /* if PD, then return */
        if (test_bit(handle, ioc->pd_handles))
                return;

        clear_bit(handle, ioc->pend_os_device_add);

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_by_handle(ioc, handle);
        if (sas_device && sas_device->starget &&
            sas_device->starget->hostdata) {
                sas_target_priv_data = sas_device->starget->hostdata;
                sas_target_priv_data->deleted = 1;
                sas_address = sas_device->sas_address;
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        if (!sas_device) {
                spin_lock_irqsave(&ioc->pcie_device_lock, flags);
                pcie_device = __mpt3sas_get_pdev_by_handle(ioc, handle);
                if (pcie_device && pcie_device->starget &&
                        pcie_device->starget->hostdata) {
                        sas_target_priv_data = pcie_device->starget->hostdata;
                        sas_target_priv_data->deleted = 1;
                        sas_address = pcie_device->wwid;
                }
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
                if (pcie_device && (!ioc->tm_custom_handling))
                        tr_method =
                            MPI26_SCSITASKMGMT_MSGFLAGS_PROTOCOL_LVL_RST_PCIE;
                else
                        tr_method = MPI2_SCSITASKMGMT_MSGFLAGS_LINK_RESET;
        }
        if (sas_target_priv_data) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "setting delete flag: handle(0x%04x), sas_addr(0x%016llx)\n",
                        ioc->name, handle,
                    (unsigned long long)sas_address));
                if (sas_device) {
                        if (sas_device->enclosure_handle != 0)
                                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                    "setting delete flag:enclosure logical "
                                    "id(0x%016llx), slot(%d)\n", ioc->name,
                                    (unsigned long long)
                                    sas_device->enclosure_logical_id,
                                    sas_device->slot));
                        if (sas_device->connector_name[0] != '\0')
                                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                    "setting delete flag: enclosure "
                                    "level(0x%04x), connector name( %s)\n",
                                    ioc->name, sas_device->enclosure_level,
                                    sas_device->connector_name));
                } else if (pcie_device) {
                        if (pcie_device->enclosure_handle != 0)
                                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                    "setting delete flag: logical "
                                    "id(0x%016llx), slot(%d)\n", ioc->name,
                                    (unsigned long long)
                                    pcie_device->enclosure_logical_id,
                                    pcie_device->slot));
                        if (pcie_device->connector_name[0] != '\0')
                                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                    "setting delete flag:, enclosure "
                                    "level(0x%04x), "
                                    "connector name( %s)\n", ioc->name,
                                    pcie_device->enclosure_level,
                                    pcie_device->connector_name));
                }
                _scsih_ublock_io_device(ioc, sas_address);
                sas_target_priv_data->handle = MPT3SAS_INVALID_DEVICE_HANDLE;
        }

        smid = mpt3sas_base_get_smid_hpr(ioc, ioc->tm_tr_cb_idx);
        if (!smid) {
                delayed_tr = kzalloc(sizeof(*delayed_tr), GFP_ATOMIC);
                if (!delayed_tr)
                        goto out;
                INIT_LIST_HEAD(&delayed_tr->list);
                delayed_tr->handle = handle;
                list_add_tail(&delayed_tr->list, &ioc->delayed_tr_list);
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "DELAYED:tr:handle(0x%04x), (open)\n",
                    ioc->name, handle));
                goto out;
        }

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "tr_send:handle(0x%04x), (open), smid(%d), cb(%d)\n",
                ioc->name, handle, smid,
            ioc->tm_tr_cb_idx));
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        memset(mpi_request, 0, sizeof(Mpi2SCSITaskManagementRequest_t));
        mpi_request->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
        mpi_request->DevHandle = cpu_to_le16(handle);
        mpi_request->TaskType = MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET;
        mpi_request->MsgFlags = tr_method;
        set_bit(handle, ioc->device_remove_in_progress);
        mpt3sas_base_put_smid_hi_priority(ioc, smid, 0);
        mpt3sas_trigger_master(ioc, MASTER_TRIGGER_DEVICE_REMOVAL);

out:
        if (sas_device)
                sas_device_put(sas_device);
        if (pcie_device)
                pcie_device_put(pcie_device);
}

/**
 * _scsih_tm_tr_complete -
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 * Context: interrupt time.
 *
 * This is the target reset completion routine.
 * This code is part of the code to initiate the device removal
 * handshake protocol with controller firmware.
 * It will send a sas iounit control request (MPI2_SAS_OP_REMOVE_DEVICE)
 *
 * Return: 1 meaning mf should be freed from _base_interrupt
 *         0 means the mf is freed from this function.
 */
static u8
_scsih_tm_tr_complete(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
        u32 reply)
{
        u16 handle;
        Mpi2SCSITaskManagementRequest_t *mpi_request_tm;
        Mpi2SCSITaskManagementReply_t *mpi_reply =
            mpt3sas_base_get_reply_virt_addr(ioc, reply);
        Mpi2SasIoUnitControlRequest_t *mpi_request;
        u16 smid_sas_ctrl;
        u32 ioc_state;
        struct _sc_list *delayed_sc;

        if (ioc->pci_error_recovery) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: host in pci error recovery\n", __func__,
                        ioc->name));
                return 1;
        }
        ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
        if (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: host is not operational\n", __func__, ioc->name));
                return 1;
        }
        if (unlikely(!mpi_reply)) {
                pr_err(MPT3SAS_FMT "mpi_reply not valid at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return 1;
        }
        mpi_request_tm = mpt3sas_base_get_msg_frame(ioc, smid);
        handle = le16_to_cpu(mpi_request_tm->DevHandle);
        if (handle != le16_to_cpu(mpi_reply->DevHandle)) {
                dewtprintk(ioc, pr_err(MPT3SAS_FMT
                        "spurious interrupt: handle(0x%04x:0x%04x), smid(%d)!!!\n",
                        ioc->name, handle,
                    le16_to_cpu(mpi_reply->DevHandle), smid));
                return 0;
        }

        mpt3sas_trigger_master(ioc, MASTER_TRIGGER_TASK_MANAGMENT);
        dewtprintk(ioc, pr_info(MPT3SAS_FMT
            "tr_complete:handle(0x%04x), (open) smid(%d), ioc_status(0x%04x), "
            "loginfo(0x%08x), completed(%d)\n", ioc->name,
            handle, smid, le16_to_cpu(mpi_reply->IOCStatus),
            le32_to_cpu(mpi_reply->IOCLogInfo),
            le32_to_cpu(mpi_reply->TerminationCount)));

        smid_sas_ctrl = mpt3sas_base_get_smid(ioc, ioc->tm_sas_control_cb_idx);
        if (!smid_sas_ctrl) {
                delayed_sc = kzalloc(sizeof(*delayed_sc), GFP_ATOMIC);
                if (!delayed_sc)
                        return _scsih_check_for_pending_tm(ioc, smid);
                INIT_LIST_HEAD(&delayed_sc->list);
                delayed_sc->handle = le16_to_cpu(mpi_request_tm->DevHandle);
                list_add_tail(&delayed_sc->list, &ioc->delayed_sc_list);
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "DELAYED:sc:handle(0x%04x), (open)\n",
                    ioc->name, handle));
                return _scsih_check_for_pending_tm(ioc, smid);
        }

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "sc_send:handle(0x%04x), (open), smid(%d), cb(%d)\n",
                ioc->name, handle, smid_sas_ctrl,
            ioc->tm_sas_control_cb_idx));
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid_sas_ctrl);
        memset(mpi_request, 0, sizeof(Mpi2SasIoUnitControlRequest_t));
        mpi_request->Function = MPI2_FUNCTION_SAS_IO_UNIT_CONTROL;
        mpi_request->Operation = MPI2_SAS_OP_REMOVE_DEVICE;
        mpi_request->DevHandle = mpi_request_tm->DevHandle;
        mpt3sas_base_put_smid_default(ioc, smid_sas_ctrl);

        return _scsih_check_for_pending_tm(ioc, smid);
}

/** _scsih_allow_scmd_to_device - check whether scmd needs to
 *                               issue to IOC or not.
 * @ioc: per adapter object
 * @scmd: pointer to scsi command object
 *
 * Returns true if scmd can be issued to IOC otherwise returns false.
 */
inline bool _scsih_allow_scmd_to_device(struct MPT3SAS_ADAPTER *ioc,
        struct scsi_cmnd *scmd)
{

        if (ioc->pci_error_recovery)
                return false;

        if (ioc->hba_mpi_version_belonged == MPI2_VERSION) {
                if (ioc->remove_host)
                        return false;

                return true;
        }

        if (ioc->remove_host) {

                switch (scmd->cmnd[0]) {
                case SYNCHRONIZE_CACHE:
                case START_STOP:
                        return true;
                default:
                        return false;
                }
        }

        return true;
}

/**
 * _scsih_sas_control_complete - completion routine
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 * Context: interrupt time.
 *
 * This is the sas iounit control completion routine.
 * This code is part of the code to initiate the device removal
 * handshake protocol with controller firmware.
 *
 * Return: 1 meaning mf should be freed from _base_interrupt
 *         0 means the mf is freed from this function.
 */
static u8
_scsih_sas_control_complete(struct MPT3SAS_ADAPTER *ioc, u16 smid,
        u8 msix_index, u32 reply)
{
        Mpi2SasIoUnitControlReply_t *mpi_reply =
            mpt3sas_base_get_reply_virt_addr(ioc, reply);

        if (likely(mpi_reply)) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "sc_complete:handle(0x%04x), (open) "
                "smid(%d), ioc_status(0x%04x), loginfo(0x%08x)\n",
                ioc->name, le16_to_cpu(mpi_reply->DevHandle), smid,
                le16_to_cpu(mpi_reply->IOCStatus),
                le32_to_cpu(mpi_reply->IOCLogInfo)));
                if (le16_to_cpu(mpi_reply->IOCStatus) ==
                     MPI2_IOCSTATUS_SUCCESS) {
                        clear_bit(le16_to_cpu(mpi_reply->DevHandle),
                            ioc->device_remove_in_progress);
                }
        } else {
                pr_err(MPT3SAS_FMT "mpi_reply not valid at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
        }
        return mpt3sas_check_for_pending_internal_cmds(ioc, smid);
}

/**
 * _scsih_tm_tr_volume_send - send target reset request for volumes
 * @ioc: per adapter object
 * @handle: device handle
 * Context: interrupt time.
 *
 * This is designed to send muliple task management request at the same
 * time to the fifo. If the fifo is full, we will append the request,
 * and process it in a future completion.
 */
static void
_scsih_tm_tr_volume_send(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        Mpi2SCSITaskManagementRequest_t *mpi_request;
        u16 smid;
        struct _tr_list *delayed_tr;

        if (ioc->pci_error_recovery) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: host reset in progress!\n",
                        __func__, ioc->name));
                return;
        }

        smid = mpt3sas_base_get_smid_hpr(ioc, ioc->tm_tr_volume_cb_idx);
        if (!smid) {
                delayed_tr = kzalloc(sizeof(*delayed_tr), GFP_ATOMIC);
                if (!delayed_tr)
                        return;
                INIT_LIST_HEAD(&delayed_tr->list);
                delayed_tr->handle = handle;
                list_add_tail(&delayed_tr->list, &ioc->delayed_tr_volume_list);
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "DELAYED:tr:handle(0x%04x), (open)\n",
                    ioc->name, handle));
                return;
        }

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "tr_send:handle(0x%04x), (open), smid(%d), cb(%d)\n",
                ioc->name, handle, smid,
            ioc->tm_tr_volume_cb_idx));
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        memset(mpi_request, 0, sizeof(Mpi2SCSITaskManagementRequest_t));
        mpi_request->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
        mpi_request->DevHandle = cpu_to_le16(handle);
        mpi_request->TaskType = MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET;
        mpt3sas_base_put_smid_hi_priority(ioc, smid, 0);
}

/**
 * _scsih_tm_volume_tr_complete - target reset completion
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 * Context: interrupt time.
 *
 * Return: 1 meaning mf should be freed from _base_interrupt
 *         0 means the mf is freed from this function.
 */
static u8
_scsih_tm_volume_tr_complete(struct MPT3SAS_ADAPTER *ioc, u16 smid,
        u8 msix_index, u32 reply)
{
        u16 handle;
        Mpi2SCSITaskManagementRequest_t *mpi_request_tm;
        Mpi2SCSITaskManagementReply_t *mpi_reply =
            mpt3sas_base_get_reply_virt_addr(ioc, reply);

        if (ioc->shost_recovery || ioc->pci_error_recovery) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: host reset in progress!\n",
                        __func__, ioc->name));
                return 1;
        }
        if (unlikely(!mpi_reply)) {
                pr_err(MPT3SAS_FMT "mpi_reply not valid at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return 1;
        }

        mpi_request_tm = mpt3sas_base_get_msg_frame(ioc, smid);
        handle = le16_to_cpu(mpi_request_tm->DevHandle);
        if (handle != le16_to_cpu(mpi_reply->DevHandle)) {
                dewtprintk(ioc, pr_err(MPT3SAS_FMT
                        "spurious interrupt: handle(0x%04x:0x%04x), smid(%d)!!!\n",
                        ioc->name, handle,
                    le16_to_cpu(mpi_reply->DevHandle), smid));
                return 0;
        }

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
            "tr_complete:handle(0x%04x), (open) smid(%d), ioc_status(0x%04x), "
            "loginfo(0x%08x), completed(%d)\n", ioc->name,
            handle, smid, le16_to_cpu(mpi_reply->IOCStatus),
            le32_to_cpu(mpi_reply->IOCLogInfo),
            le32_to_cpu(mpi_reply->TerminationCount)));

        return _scsih_check_for_pending_tm(ioc, smid);
}

/**
 * _scsih_issue_delayed_event_ack - issue delayed Event ACK messages
 * @ioc: per adapter object
 * @smid: system request message index
 * @event: Event ID
 * @event_context: used to track events uniquely
 *
 * Context - processed in interrupt context.
 */
static void
_scsih_issue_delayed_event_ack(struct MPT3SAS_ADAPTER *ioc, u16 smid, U16 event,
                                U32 event_context)
{
        Mpi2EventAckRequest_t *ack_request;
        int i = smid - ioc->internal_smid;
        unsigned long flags;

        /* Without releasing the smid just update the
         * call back index and reuse the same smid for
         * processing this delayed request
         */
        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        ioc->internal_lookup[i].cb_idx = ioc->base_cb_idx;
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "EVENT ACK: event(0x%04x), smid(%d), cb(%d)\n",
                ioc->name, le16_to_cpu(event), smid,
                ioc->base_cb_idx));
        ack_request = mpt3sas_base_get_msg_frame(ioc, smid);
        memset(ack_request, 0, sizeof(Mpi2EventAckRequest_t));
        ack_request->Function = MPI2_FUNCTION_EVENT_ACK;
        ack_request->Event = event;
        ack_request->EventContext = event_context;
        ack_request->VF_ID = 0;  /* TODO */
        ack_request->VP_ID = 0;
        mpt3sas_base_put_smid_default(ioc, smid);
}

/**
 * _scsih_issue_delayed_sas_io_unit_ctrl - issue delayed
 *                              sas_io_unit_ctrl messages
 * @ioc: per adapter object
 * @smid: system request message index
 * @handle: device handle
 *
 * Context - processed in interrupt context.
 */
static void
_scsih_issue_delayed_sas_io_unit_ctrl(struct MPT3SAS_ADAPTER *ioc,
                                        u16 smid, u16 handle)
{
        Mpi2SasIoUnitControlRequest_t *mpi_request;
        u32 ioc_state;
        int i = smid - ioc->internal_smid;
        unsigned long flags;

        if (ioc->remove_host) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                            "%s: host has been removed\n",
                             __func__, ioc->name));
                return;
        } else if (ioc->pci_error_recovery) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                            "%s: host in pci error recovery\n",
                            __func__, ioc->name));
                return;
        }
        ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
        if (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "%s: host is not operational\n",
                    __func__, ioc->name));
                return;
        }

        /* Without releasing the smid just update the
         * call back index and reuse the same smid for
         * processing this delayed request
         */
        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        ioc->internal_lookup[i].cb_idx = ioc->tm_sas_control_cb_idx;
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
            "sc_send:handle(0x%04x), (open), smid(%d), cb(%d)\n",
            ioc->name, handle, smid,
            ioc->tm_sas_control_cb_idx));
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        memset(mpi_request, 0, sizeof(Mpi2SasIoUnitControlRequest_t));
        mpi_request->Function = MPI2_FUNCTION_SAS_IO_UNIT_CONTROL;
        mpi_request->Operation = MPI2_SAS_OP_REMOVE_DEVICE;
        mpi_request->DevHandle = cpu_to_le16(handle);
        mpt3sas_base_put_smid_default(ioc, smid);
}

/**
 * _scsih_check_for_pending_internal_cmds - check for pending internal messages
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Context: Executed in interrupt context
 *
 * This will check delayed internal messages list, and process the
 * next request.
 *
 * Return: 1 meaning mf should be freed from _base_interrupt
 *         0 means the mf is freed from this function.
 */
u8
mpt3sas_check_for_pending_internal_cmds(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        struct _sc_list *delayed_sc;
        struct _event_ack_list *delayed_event_ack;

        if (!list_empty(&ioc->delayed_event_ack_list)) {
                delayed_event_ack = list_entry(ioc->delayed_event_ack_list.next,
                                                struct _event_ack_list, list);
                _scsih_issue_delayed_event_ack(ioc, smid,
                  delayed_event_ack->Event, delayed_event_ack->EventContext);
                list_del(&delayed_event_ack->list);
                kfree(delayed_event_ack);
                return 0;
        }

        if (!list_empty(&ioc->delayed_sc_list)) {
                delayed_sc = list_entry(ioc->delayed_sc_list.next,
                                                struct _sc_list, list);
                _scsih_issue_delayed_sas_io_unit_ctrl(ioc, smid,
                                                 delayed_sc->handle);
                list_del(&delayed_sc->list);
                kfree(delayed_sc);
                return 0;
        }
        return 1;
}

/**
 * _scsih_check_for_pending_tm - check for pending task management
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * This will check delayed target reset list, and feed the
 * next reqeust.
 *
 * Return: 1 meaning mf should be freed from _base_interrupt
 *         0 means the mf is freed from this function.
 */
static u8
_scsih_check_for_pending_tm(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        struct _tr_list *delayed_tr;

        if (!list_empty(&ioc->delayed_tr_volume_list)) {
                delayed_tr = list_entry(ioc->delayed_tr_volume_list.next,
                    struct _tr_list, list);
                mpt3sas_base_free_smid(ioc, smid);
                _scsih_tm_tr_volume_send(ioc, delayed_tr->handle);
                list_del(&delayed_tr->list);
                kfree(delayed_tr);
                return 0;
        }

        if (!list_empty(&ioc->delayed_tr_list)) {
                delayed_tr = list_entry(ioc->delayed_tr_list.next,
                    struct _tr_list, list);
                mpt3sas_base_free_smid(ioc, smid);
                _scsih_tm_tr_send(ioc, delayed_tr->handle);
                list_del(&delayed_tr->list);
                kfree(delayed_tr);
                return 0;
        }

        return 1;
}

/**
 * _scsih_check_topo_delete_events - sanity check on topo events
 * @ioc: per adapter object
 * @event_data: the event data payload
 *
 * This routine added to better handle cable breaker.
 *
 * This handles the case where driver receives multiple expander
 * add and delete events in a single shot.  When there is a delete event
 * the routine will void any pending add events waiting in the event queue.
 */
static void
_scsih_check_topo_delete_events(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataSasTopologyChangeList_t *event_data)
{
        struct fw_event_work *fw_event;
        Mpi2EventDataSasTopologyChangeList_t *local_event_data;
        u16 expander_handle;
        struct _sas_node *sas_expander;
        unsigned long flags;
        int i, reason_code;
        u16 handle;

        for (i = 0 ; i < event_data->NumEntries; i++) {
                handle = le16_to_cpu(event_data->PHY[i].AttachedDevHandle);
                if (!handle)
                        continue;
                reason_code = event_data->PHY[i].PhyStatus &
                    MPI2_EVENT_SAS_TOPO_RC_MASK;
                if (reason_code == MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING)
                        _scsih_tm_tr_send(ioc, handle);
        }

        expander_handle = le16_to_cpu(event_data->ExpanderDevHandle);
        if (expander_handle < ioc->sas_hba.num_phys) {
                _scsih_block_io_to_children_attached_directly(ioc, event_data);
                return;
        }
        if (event_data->ExpStatus ==
            MPI2_EVENT_SAS_TOPO_ES_DELAY_NOT_RESPONDING) {
                /* put expander attached devices into blocking state */
                spin_lock_irqsave(&ioc->sas_node_lock, flags);
                sas_expander = mpt3sas_scsih_expander_find_by_handle(ioc,
                    expander_handle);
                _scsih_block_io_to_children_attached_to_ex(ioc, sas_expander);
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                do {
                        handle = find_first_bit(ioc->blocking_handles,
                            ioc->facts.MaxDevHandle);
                        if (handle < ioc->facts.MaxDevHandle)
                                _scsih_block_io_device(ioc, handle);
                } while (test_and_clear_bit(handle, ioc->blocking_handles));
        } else if (event_data->ExpStatus == MPI2_EVENT_SAS_TOPO_ES_RESPONDING)
                _scsih_block_io_to_children_attached_directly(ioc, event_data);

        if (event_data->ExpStatus != MPI2_EVENT_SAS_TOPO_ES_NOT_RESPONDING)
                return;

        /* mark ignore flag for pending events */
        spin_lock_irqsave(&ioc->fw_event_lock, flags);
        list_for_each_entry(fw_event, &ioc->fw_event_list, list) {
                if (fw_event->event != MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST ||
                    fw_event->ignore)
                        continue;
                local_event_data = (Mpi2EventDataSasTopologyChangeList_t *)
                                   fw_event->event_data;
                if (local_event_data->ExpStatus ==
                    MPI2_EVENT_SAS_TOPO_ES_ADDED ||
                    local_event_data->ExpStatus ==
                    MPI2_EVENT_SAS_TOPO_ES_RESPONDING) {
                        if (le16_to_cpu(local_event_data->ExpanderDevHandle) ==
                            expander_handle) {
                                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                    "setting ignoring flag\n", ioc->name));
                                fw_event->ignore = 1;
                        }
                }
        }
        spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
}

/**
 * _scsih_check_pcie_topo_remove_events - sanity check on topo
 * events
 * @ioc: per adapter object
 * @event_data: the event data payload
 *
 * This handles the case where driver receives multiple switch
 * or device add and delete events in a single shot.  When there
 * is a delete event the routine will void any pending add
 * events waiting in the event queue.
 */
static void
_scsih_check_pcie_topo_remove_events(struct MPT3SAS_ADAPTER *ioc,
        Mpi26EventDataPCIeTopologyChangeList_t *event_data)
{
        struct fw_event_work *fw_event;
        Mpi26EventDataPCIeTopologyChangeList_t *local_event_data;
        unsigned long flags;
        int i, reason_code;
        u16 handle, switch_handle;

        for (i = 0; i < event_data->NumEntries; i++) {
                handle =
                        le16_to_cpu(event_data->PortEntry[i].AttachedDevHandle);
                if (!handle)
                        continue;
                reason_code = event_data->PortEntry[i].PortStatus;
                if (reason_code == MPI26_EVENT_PCIE_TOPO_PS_NOT_RESPONDING)
                        _scsih_tm_tr_send(ioc, handle);
        }

        switch_handle = le16_to_cpu(event_data->SwitchDevHandle);
        if (!switch_handle) {
                _scsih_block_io_to_pcie_children_attached_directly(
                                                        ioc, event_data);
                return;
        }
    /* TODO We are not supporting cascaded PCIe Switch removal yet*/
        if ((event_data->SwitchStatus
                == MPI26_EVENT_PCIE_TOPO_SS_DELAY_NOT_RESPONDING) ||
                (event_data->SwitchStatus ==
                                        MPI26_EVENT_PCIE_TOPO_SS_RESPONDING))
                _scsih_block_io_to_pcie_children_attached_directly(
                                                        ioc, event_data);

        if (event_data->SwitchStatus != MPI2_EVENT_SAS_TOPO_ES_NOT_RESPONDING)
                return;

        /* mark ignore flag for pending events */
        spin_lock_irqsave(&ioc->fw_event_lock, flags);
        list_for_each_entry(fw_event, &ioc->fw_event_list, list) {
                if (fw_event->event != MPI2_EVENT_PCIE_TOPOLOGY_CHANGE_LIST ||
                        fw_event->ignore)
                        continue;
                local_event_data =
                        (Mpi26EventDataPCIeTopologyChangeList_t *)
                        fw_event->event_data;
                if (local_event_data->SwitchStatus ==
                    MPI2_EVENT_SAS_TOPO_ES_ADDED ||
                    local_event_data->SwitchStatus ==
                    MPI2_EVENT_SAS_TOPO_ES_RESPONDING) {
                        if (le16_to_cpu(local_event_data->SwitchDevHandle) ==
                                switch_handle) {
                                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                        "setting ignoring flag for switch event\n",
                                        ioc->name));
                                fw_event->ignore = 1;
                        }
                }
        }
        spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
}

/**
 * _scsih_set_volume_delete_flag - setting volume delete flag
 * @ioc: per adapter object
 * @handle: device handle
 *
 * This returns nothing.
 */
static void
_scsih_set_volume_delete_flag(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _raid_device *raid_device;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        unsigned long flags;

        spin_lock_irqsave(&ioc->raid_device_lock, flags);
        raid_device = mpt3sas_raid_device_find_by_handle(ioc, handle);
        if (raid_device && raid_device->starget &&
            raid_device->starget->hostdata) {
                sas_target_priv_data =
                    raid_device->starget->hostdata;
                sas_target_priv_data->deleted = 1;
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "setting delete flag: handle(0x%04x), "
                    "wwid(0x%016llx)\n", ioc->name, handle,
                    (unsigned long long) raid_device->wwid));
        }
        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
}

/**
 * _scsih_set_volume_handle_for_tr - set handle for target reset to volume
 * @handle: input handle
 * @a: handle for volume a
 * @b: handle for volume b
 *
 * IR firmware only supports two raid volumes.  The purpose of this
 * routine is to set the volume handle in either a or b. When the given
 * input handle is non-zero, or when a and b have not been set before.
 */
static void
_scsih_set_volume_handle_for_tr(u16 handle, u16 *a, u16 *b)
{
        if (!handle || handle == *a || handle == *b)
                return;
        if (!*a)
                *a = handle;
        else if (!*b)
                *b = handle;
}

/**
 * _scsih_check_ir_config_unhide_events - check for UNHIDE events
 * @ioc: per adapter object
 * @event_data: the event data payload
 * Context: interrupt time.
 *
 * This routine will send target reset to volume, followed by target
 * resets to the PDs. This is called when a PD has been removed, or
 * volume has been deleted or removed. When the target reset is sent
 * to volume, the PD target resets need to be queued to start upon
 * completion of the volume target reset.
 */
static void
_scsih_check_ir_config_unhide_events(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataIrConfigChangeList_t *event_data)
{
        Mpi2EventIrConfigElement_t *element;
        int i;
        u16 handle, volume_handle, a, b;
        struct _tr_list *delayed_tr;

        a = 0;
        b = 0;

        if (ioc->is_warpdrive)
                return;

        /* Volume Resets for Deleted or Removed */
        element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
        for (i = 0; i < event_data->NumElements; i++, element++) {
                if (le32_to_cpu(event_data->Flags) &
                    MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG)
                        continue;
                if (element->ReasonCode ==
                    MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED ||
                    element->ReasonCode ==
                    MPI2_EVENT_IR_CHANGE_RC_REMOVED) {
                        volume_handle = le16_to_cpu(element->VolDevHandle);
                        _scsih_set_volume_delete_flag(ioc, volume_handle);
                        _scsih_set_volume_handle_for_tr(volume_handle, &a, &b);
                }
        }

        /* Volume Resets for UNHIDE events */
        element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
        for (i = 0; i < event_data->NumElements; i++, element++) {
                if (le32_to_cpu(event_data->Flags) &
                    MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG)
                        continue;
                if (element->ReasonCode == MPI2_EVENT_IR_CHANGE_RC_UNHIDE) {
                        volume_handle = le16_to_cpu(element->VolDevHandle);
                        _scsih_set_volume_handle_for_tr(volume_handle, &a, &b);
                }
        }

        if (a)
                _scsih_tm_tr_volume_send(ioc, a);
        if (b)
                _scsih_tm_tr_volume_send(ioc, b);

        /* PD target resets */
        element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
        for (i = 0; i < event_data->NumElements; i++, element++) {
                if (element->ReasonCode != MPI2_EVENT_IR_CHANGE_RC_UNHIDE)
                        continue;
                handle = le16_to_cpu(element->PhysDiskDevHandle);
                volume_handle = le16_to_cpu(element->VolDevHandle);
                clear_bit(handle, ioc->pd_handles);
                if (!volume_handle)
                        _scsih_tm_tr_send(ioc, handle);
                else if (volume_handle == a || volume_handle == b) {
                        delayed_tr = kzalloc(sizeof(*delayed_tr), GFP_ATOMIC);
                        BUG_ON(!delayed_tr);
                        INIT_LIST_HEAD(&delayed_tr->list);
                        delayed_tr->handle = handle;
                        list_add_tail(&delayed_tr->list, &ioc->delayed_tr_list);
                        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                            "DELAYED:tr:handle(0x%04x), (open)\n", ioc->name,
                            handle));
                } else
                        _scsih_tm_tr_send(ioc, handle);
        }
}


/**
 * _scsih_check_volume_delete_events - set delete flag for volumes
 * @ioc: per adapter object
 * @event_data: the event data payload
 * Context: interrupt time.
 *
 * This will handle the case when the cable connected to entire volume is
 * pulled. We will take care of setting the deleted flag so normal IO will
 * not be sent.
 */
static void
_scsih_check_volume_delete_events(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataIrVolume_t *event_data)
{
        u32 state;

        if (event_data->ReasonCode != MPI2_EVENT_IR_VOLUME_RC_STATE_CHANGED)
                return;
        state = le32_to_cpu(event_data->NewValue);
        if (state == MPI2_RAID_VOL_STATE_MISSING || state ==
            MPI2_RAID_VOL_STATE_FAILED)
                _scsih_set_volume_delete_flag(ioc,
                    le16_to_cpu(event_data->VolDevHandle));
}

/**
 * _scsih_temp_threshold_events - display temperature threshold exceeded events
 * @ioc: per adapter object
 * @event_data: the temp threshold event data
 * Context: interrupt time.
 */
static void
_scsih_temp_threshold_events(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataTemperature_t *event_data)
{
        if (ioc->temp_sensors_count >= event_data->SensorNum) {
                pr_err(MPT3SAS_FMT "Temperature Threshold flags %s%s%s%s"
                  " exceeded for Sensor: %d !!!\n", ioc->name,
                  ((le16_to_cpu(event_data->Status) & 0x1) == 1) ? "0 " : " ",
                  ((le16_to_cpu(event_data->Status) & 0x2) == 2) ? "1 " : " ",
                  ((le16_to_cpu(event_data->Status) & 0x4) == 4) ? "2 " : " ",
                  ((le16_to_cpu(event_data->Status) & 0x8) == 8) ? "3 " : " ",
                  event_data->SensorNum);
                pr_err(MPT3SAS_FMT "Current Temp In Celsius: %d\n",
                        ioc->name, event_data->CurrentTemperature);
        }
}

static int _scsih_set_satl_pending(struct scsi_cmnd *scmd, bool pending)
{
        struct MPT3SAS_DEVICE *priv = scmd->device->hostdata;

        if (scmd->cmnd[0] != ATA_12 && scmd->cmnd[0] != ATA_16)
                return 0;

        if (pending)
                return test_and_set_bit(0, &priv->ata_command_pending);

        clear_bit(0, &priv->ata_command_pending);
        return 0;
}

/**
 * _scsih_flush_running_cmds - completing outstanding commands.
 * @ioc: per adapter object
 *
 * The flushing out of all pending scmd commands following host reset,
 * where all IO is dropped to the floor.
 */
static void
_scsih_flush_running_cmds(struct MPT3SAS_ADAPTER *ioc)
{
        struct scsi_cmnd *scmd;
        struct scsiio_tracker *st;
        u16 smid;
        int count = 0;

        for (smid = 1; smid <= ioc->scsiio_depth; smid++) {
                scmd = mpt3sas_scsih_scsi_lookup_get(ioc, smid);
                if (!scmd)
                        continue;
                count++;
                _scsih_set_satl_pending(scmd, false);
                st = scsi_cmd_priv(scmd);
                mpt3sas_base_clear_st(ioc, st);
                scsi_dma_unmap(scmd);
                if (ioc->pci_error_recovery || ioc->remove_host)
                        scmd->result = DID_NO_CONNECT << 16;
                else
                        scmd->result = DID_RESET << 16;
                scmd->scsi_done(scmd);
        }
        dtmprintk(ioc, pr_info(MPT3SAS_FMT "completing %d cmds\n",
            ioc->name, count));
}

/**
 * _scsih_setup_eedp - setup MPI request for EEDP transfer
 * @ioc: per adapter object
 * @scmd: pointer to scsi command object
 * @mpi_request: pointer to the SCSI_IO request message frame
 *
 * Supporting protection 1 and 3.
 */
static void
_scsih_setup_eedp(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
        Mpi25SCSIIORequest_t *mpi_request)
{
        u16 eedp_flags;
        unsigned char prot_op = scsi_get_prot_op(scmd);
        unsigned char prot_type = scsi_get_prot_type(scmd);
        Mpi25SCSIIORequest_t *mpi_request_3v =
           (Mpi25SCSIIORequest_t *)mpi_request;

        if (prot_type == SCSI_PROT_DIF_TYPE0 || prot_op == SCSI_PROT_NORMAL)
                return;

        if (prot_op ==  SCSI_PROT_READ_STRIP)
                eedp_flags = MPI2_SCSIIO_EEDPFLAGS_CHECK_REMOVE_OP;
        else if (prot_op ==  SCSI_PROT_WRITE_INSERT)
                eedp_flags = MPI2_SCSIIO_EEDPFLAGS_INSERT_OP;
        else
                return;

        switch (prot_type) {
        case SCSI_PROT_DIF_TYPE1:
        case SCSI_PROT_DIF_TYPE2:

                /*
                * enable ref/guard checking
                * auto increment ref tag
                */
                eedp_flags |= MPI2_SCSIIO_EEDPFLAGS_INC_PRI_REFTAG |
                    MPI2_SCSIIO_EEDPFLAGS_CHECK_REFTAG |
                    MPI2_SCSIIO_EEDPFLAGS_CHECK_GUARD;
                mpi_request->CDB.EEDP32.PrimaryReferenceTag =
                    cpu_to_be32(t10_pi_ref_tag(scmd->request));
                break;

        case SCSI_PROT_DIF_TYPE3:

                /*
                * enable guard checking
                */
                eedp_flags |= MPI2_SCSIIO_EEDPFLAGS_CHECK_GUARD;

                break;
        }

        mpi_request_3v->EEDPBlockSize =
            cpu_to_le16(scmd->device->sector_size);

        if (ioc->is_gen35_ioc)
                eedp_flags |= MPI25_SCSIIO_EEDPFLAGS_APPTAG_DISABLE_MODE;
        mpi_request->EEDPFlags = cpu_to_le16(eedp_flags);
}

/**
 * _scsih_eedp_error_handling - return sense code for EEDP errors
 * @scmd: pointer to scsi command object
 * @ioc_status: ioc status
 */
static void
_scsih_eedp_error_handling(struct scsi_cmnd *scmd, u16 ioc_status)
{
        u8 ascq;

        switch (ioc_status) {
        case MPI2_IOCSTATUS_EEDP_GUARD_ERROR:
                ascq = 0x01;
                break;
        case MPI2_IOCSTATUS_EEDP_APP_TAG_ERROR:
                ascq = 0x02;
                break;
        case MPI2_IOCSTATUS_EEDP_REF_TAG_ERROR:
                ascq = 0x03;
                break;
        default:
                ascq = 0x00;
                break;
        }
        scsi_build_sense_buffer(0, scmd->sense_buffer, ILLEGAL_REQUEST, 0x10,
            ascq);
        scmd->result = DRIVER_SENSE << 24 | (DID_ABORT << 16) |
            SAM_STAT_CHECK_CONDITION;
}

/**
 * scsih_qcmd - main scsi request entry point
 * @shost: SCSI host pointer
 * @scmd: pointer to scsi command object
 *
 * The callback index is set inside `ioc->scsi_io_cb_idx`.
 *
 * Return: 0 on success.  If there's a failure, return either:
 * SCSI_MLQUEUE_DEVICE_BUSY if the device queue is full, or
 * SCSI_MLQUEUE_HOST_BUSY if the entire host queue is full
 */
static int
scsih_qcmd(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
{
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        struct _raid_device *raid_device;
        struct request *rq = scmd->request;
        int class;
        Mpi25SCSIIORequest_t *mpi_request;
        struct _pcie_device *pcie_device = NULL;
        u32 mpi_control;
        u16 smid;
        u16 handle;

        if (ioc->logging_level & MPT_DEBUG_SCSI)
                scsi_print_command(scmd);

        sas_device_priv_data = scmd->device->hostdata;
        if (!sas_device_priv_data || !sas_device_priv_data->sas_target) {
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                return 0;
        }

        if (!(_scsih_allow_scmd_to_device(ioc, scmd))) {
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                return 0;
        }

        sas_target_priv_data = sas_device_priv_data->sas_target;

        /* invalid device handle */
        handle = sas_target_priv_data->handle;
        if (handle == MPT3SAS_INVALID_DEVICE_HANDLE) {
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                return 0;
        }


        if (ioc->shost_recovery || ioc->ioc_link_reset_in_progress) {
                /* host recovery or link resets sent via IOCTLs */
                return SCSI_MLQUEUE_HOST_BUSY;
        } else if (sas_target_priv_data->deleted) {
                /* device has been deleted */
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                return 0;
        } else if (sas_target_priv_data->tm_busy ||
                   sas_device_priv_data->block) {
                /* device busy with task management */
                return SCSI_MLQUEUE_DEVICE_BUSY;
        }

        /*
         * Bug work around for firmware SATL handling.  The loop
         * is based on atomic operations and ensures consistency
         * since we're lockless at this point
         */
        do {
                if (test_bit(0, &sas_device_priv_data->ata_command_pending)) {
                        scmd->result = SAM_STAT_BUSY;
                        scmd->scsi_done(scmd);
                        return 0;
                }
        } while (_scsih_set_satl_pending(scmd, true));

        if (scmd->sc_data_direction == DMA_FROM_DEVICE)
                mpi_control = MPI2_SCSIIO_CONTROL_READ;
        else if (scmd->sc_data_direction == DMA_TO_DEVICE)
                mpi_control = MPI2_SCSIIO_CONTROL_WRITE;
        else
                mpi_control = MPI2_SCSIIO_CONTROL_NODATATRANSFER;

        /* set tags */
        mpi_control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
        /* NCQ Prio supported, make sure control indicated high priority */
        if (sas_device_priv_data->ncq_prio_enable) {
                class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
                if (class == IOPRIO_CLASS_RT)
                        mpi_control |= 1 << MPI2_SCSIIO_CONTROL_CMDPRI_SHIFT;
        }
        /* Make sure Device is not raid volume.
         * We do not expose raid functionality to upper layer for warpdrive.
         */
        if (((!ioc->is_warpdrive && !scsih_is_raid(&scmd->device->sdev_gendev))
                && !scsih_is_nvme(&scmd->device->sdev_gendev))
                && sas_is_tlr_enabled(scmd->device) && scmd->cmd_len != 32)
                mpi_control |= MPI2_SCSIIO_CONTROL_TLR_ON;

        smid = mpt3sas_base_get_smid_scsiio(ioc, ioc->scsi_io_cb_idx, scmd);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                _scsih_set_satl_pending(scmd, false);
                goto out;
        }
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        memset(mpi_request, 0, ioc->request_sz);
        _scsih_setup_eedp(ioc, scmd, mpi_request);

        if (scmd->cmd_len == 32)
                mpi_control |= 4 << MPI2_SCSIIO_CONTROL_ADDCDBLEN_SHIFT;
        mpi_request->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
        if (sas_device_priv_data->sas_target->flags &
            MPT_TARGET_FLAGS_RAID_COMPONENT)
                mpi_request->Function = MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH;
        else
                mpi_request->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
        mpi_request->DevHandle = cpu_to_le16(handle);
        mpi_request->DataLength = cpu_to_le32(scsi_bufflen(scmd));
        mpi_request->Control = cpu_to_le32(mpi_control);
        mpi_request->IoFlags = cpu_to_le16(scmd->cmd_len);
        mpi_request->MsgFlags = MPI2_SCSIIO_MSGFLAGS_SYSTEM_SENSE_ADDR;
        mpi_request->SenseBufferLength = SCSI_SENSE_BUFFERSIZE;
        mpi_request->SenseBufferLowAddress =
            mpt3sas_base_get_sense_buffer_dma(ioc, smid);
        mpi_request->SGLOffset0 = offsetof(Mpi25SCSIIORequest_t, SGL) / 4;
        int_to_scsilun(sas_device_priv_data->lun, (struct scsi_lun *)
            mpi_request->LUN);
        memcpy(mpi_request->CDB.CDB32, scmd->cmnd, scmd->cmd_len);

        if (mpi_request->DataLength) {
                pcie_device = sas_target_priv_data->pcie_dev;
                if (ioc->build_sg_scmd(ioc, scmd, smid, pcie_device)) {
                        mpt3sas_base_free_smid(ioc, smid);
                        _scsih_set_satl_pending(scmd, false);
                        goto out;
                }
        } else
                ioc->build_zero_len_sge(ioc, &mpi_request->SGL);

        raid_device = sas_target_priv_data->raid_device;
        if (raid_device && raid_device->direct_io_enabled)
                mpt3sas_setup_direct_io(ioc, scmd,
                        raid_device, mpi_request);

        if (likely(mpi_request->Function == MPI2_FUNCTION_SCSI_IO_REQUEST)) {
                if (sas_target_priv_data->flags & MPT_TARGET_FASTPATH_IO) {
                        mpi_request->IoFlags = cpu_to_le16(scmd->cmd_len |
                            MPI25_SCSIIO_IOFLAGS_FAST_PATH);
                        mpt3sas_base_put_smid_fast_path(ioc, smid, handle);
                } else
                        ioc->put_smid_scsi_io(ioc, smid,
                            le16_to_cpu(mpi_request->DevHandle));
        } else
                mpt3sas_base_put_smid_default(ioc, smid);
        return 0;

 out:
        return SCSI_MLQUEUE_HOST_BUSY;
}

/**
 * _scsih_normalize_sense - normalize descriptor and fixed format sense data
 * @sense_buffer: sense data returned by target
 * @data: normalized skey/asc/ascq
 */
static void
_scsih_normalize_sense(char *sense_buffer, struct sense_info *data)
{
        if ((sense_buffer[0] & 0x7F) >= 0x72) {
                /* descriptor format */
                data->skey = sense_buffer[1] & 0x0F;
                data->asc = sense_buffer[2];
                data->ascq = sense_buffer[3];
        } else {
                /* fixed format */
                data->skey = sense_buffer[2] & 0x0F;
                data->asc = sense_buffer[12];
                data->ascq = sense_buffer[13];
        }
}

/**
 * _scsih_scsi_ioc_info - translated non-succesfull SCSI_IO request
 * @ioc: per adapter object
 * @scmd: pointer to scsi command object
 * @mpi_reply: reply mf payload returned from firmware
 * @smid: ?
 *
 * scsi_status - SCSI Status code returned from target device
 * scsi_state - state info associated with SCSI_IO determined by ioc
 * ioc_status - ioc supplied status info
 */
static void
_scsih_scsi_ioc_info(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
        Mpi2SCSIIOReply_t *mpi_reply, u16 smid)
{
        u32 response_info;
        u8 *response_bytes;
        u16 ioc_status = le16_to_cpu(mpi_reply->IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        u8 scsi_state = mpi_reply->SCSIState;
        u8 scsi_status = mpi_reply->SCSIStatus;
        char *desc_ioc_state = NULL;
        char *desc_scsi_status = NULL;
        char *desc_scsi_state = ioc->tmp_string;
        u32 log_info = le32_to_cpu(mpi_reply->IOCLogInfo);
        struct _sas_device *sas_device = NULL;
        struct _pcie_device *pcie_device = NULL;
        struct scsi_target *starget = scmd->device->sdev_target;
        struct MPT3SAS_TARGET *priv_target = starget->hostdata;
        char *device_str = NULL;

        if (!priv_target)
                return;
        if (ioc->hide_ir_msg)
                device_str = "WarpDrive";
        else
                device_str = "volume";

        if (log_info == 0x31170000)
                return;

        switch (ioc_status) {
        case MPI2_IOCSTATUS_SUCCESS:
                desc_ioc_state = "success";
                break;
        case MPI2_IOCSTATUS_INVALID_FUNCTION:
                desc_ioc_state = "invalid function";
                break;
        case MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR:
                desc_ioc_state = "scsi recovered error";
                break;
        case MPI2_IOCSTATUS_SCSI_INVALID_DEVHANDLE:
                desc_ioc_state = "scsi invalid dev handle";
                break;
        case MPI2_IOCSTATUS_SCSI_DEVICE_NOT_THERE:
                desc_ioc_state = "scsi device not there";
                break;
        case MPI2_IOCSTATUS_SCSI_DATA_OVERRUN:
                desc_ioc_state = "scsi data overrun";
                break;
        case MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN:
                desc_ioc_state = "scsi data underrun";
                break;
        case MPI2_IOCSTATUS_SCSI_IO_DATA_ERROR:
                desc_ioc_state = "scsi io data error";
                break;
        case MPI2_IOCSTATUS_SCSI_PROTOCOL_ERROR:
                desc_ioc_state = "scsi protocol error";
                break;
        case MPI2_IOCSTATUS_SCSI_TASK_TERMINATED:
                desc_ioc_state = "scsi task terminated";
                break;
        case MPI2_IOCSTATUS_SCSI_RESIDUAL_MISMATCH:
                desc_ioc_state = "scsi residual mismatch";
                break;
        case MPI2_IOCSTATUS_SCSI_TASK_MGMT_FAILED:
                desc_ioc_state = "scsi task mgmt failed";
                break;
        case MPI2_IOCSTATUS_SCSI_IOC_TERMINATED:
                desc_ioc_state = "scsi ioc terminated";
                break;
        case MPI2_IOCSTATUS_SCSI_EXT_TERMINATED:
                desc_ioc_state = "scsi ext terminated";
                break;
        case MPI2_IOCSTATUS_EEDP_GUARD_ERROR:
                desc_ioc_state = "eedp guard error";
                break;
        case MPI2_IOCSTATUS_EEDP_REF_TAG_ERROR:
                desc_ioc_state = "eedp ref tag error";
                break;
        case MPI2_IOCSTATUS_EEDP_APP_TAG_ERROR:
                desc_ioc_state = "eedp app tag error";
                break;
        case MPI2_IOCSTATUS_INSUFFICIENT_POWER:
                desc_ioc_state = "insufficient power";
                break;
        default:
                desc_ioc_state = "unknown";
                break;
        }

        switch (scsi_status) {
        case MPI2_SCSI_STATUS_GOOD:
                desc_scsi_status = "good";
                break;
        case MPI2_SCSI_STATUS_CHECK_CONDITION:
                desc_scsi_status = "check condition";
                break;
        case MPI2_SCSI_STATUS_CONDITION_MET:
                desc_scsi_status = "condition met";
                break;
        case MPI2_SCSI_STATUS_BUSY:
                desc_scsi_status = "busy";
                break;
        case MPI2_SCSI_STATUS_INTERMEDIATE:
                desc_scsi_status = "intermediate";
                break;
        case MPI2_SCSI_STATUS_INTERMEDIATE_CONDMET:
                desc_scsi_status = "intermediate condmet";
                break;
        case MPI2_SCSI_STATUS_RESERVATION_CONFLICT:
                desc_scsi_status = "reservation conflict";
                break;
        case MPI2_SCSI_STATUS_COMMAND_TERMINATED:
                desc_scsi_status = "command terminated";
                break;
        case MPI2_SCSI_STATUS_TASK_SET_FULL:
                desc_scsi_status = "task set full";
                break;
        case MPI2_SCSI_STATUS_ACA_ACTIVE:
                desc_scsi_status = "aca active";
                break;
        case MPI2_SCSI_STATUS_TASK_ABORTED:
                desc_scsi_status = "task aborted";
                break;
        default:
                desc_scsi_status = "unknown";
                break;
        }

        desc_scsi_state[0] = '\0';
        if (!scsi_state)
                desc_scsi_state = " ";
        if (scsi_state & MPI2_SCSI_STATE_RESPONSE_INFO_VALID)
                strcat(desc_scsi_state, "response info ");
        if (scsi_state & MPI2_SCSI_STATE_TERMINATED)
                strcat(desc_scsi_state, "state terminated ");
        if (scsi_state & MPI2_SCSI_STATE_NO_SCSI_STATUS)
                strcat(desc_scsi_state, "no status ");
        if (scsi_state & MPI2_SCSI_STATE_AUTOSENSE_FAILED)
                strcat(desc_scsi_state, "autosense failed ");
        if (scsi_state & MPI2_SCSI_STATE_AUTOSENSE_VALID)
                strcat(desc_scsi_state, "autosense valid ");

        scsi_print_command(scmd);

        if (priv_target->flags & MPT_TARGET_FLAGS_VOLUME) {
                pr_warn(MPT3SAS_FMT "\t%s wwid(0x%016llx)\n", ioc->name,
                    device_str, (unsigned long long)priv_target->sas_address);
        } else if (priv_target->flags & MPT_TARGET_FLAGS_PCIE_DEVICE) {
                pcie_device = mpt3sas_get_pdev_from_target(ioc, priv_target);
                if (pcie_device) {
                        pr_info(MPT3SAS_FMT "\twwid(0x%016llx), port(%d)\n",
                            ioc->name,
                            (unsigned long long)pcie_device->wwid,
                            pcie_device->port_num);
                        if (pcie_device->enclosure_handle != 0)
                                pr_info(MPT3SAS_FMT
                                    "\tenclosure logical id(0x%016llx), "
                                    "slot(%d)\n", ioc->name,
                                    (unsigned long long)
                                    pcie_device->enclosure_logical_id,
                                    pcie_device->slot);
                        if (pcie_device->connector_name[0])
                                pr_info(MPT3SAS_FMT
                                    "\tenclosure level(0x%04x),"
                                    "connector name( %s)\n",
                                    ioc->name, pcie_device->enclosure_level,
                                    pcie_device->connector_name);
                        pcie_device_put(pcie_device);
                }
        } else {
                sas_device = mpt3sas_get_sdev_from_target(ioc, priv_target);
                if (sas_device) {
                        pr_warn(MPT3SAS_FMT
                                "\tsas_address(0x%016llx), phy(%d)\n",
                                ioc->name, (unsigned long long)
                            sas_device->sas_address, sas_device->phy);

                        _scsih_display_enclosure_chassis_info(ioc, sas_device,
                            NULL, NULL);

                        sas_device_put(sas_device);
                }
        }

        pr_warn(MPT3SAS_FMT
                "\thandle(0x%04x), ioc_status(%s)(0x%04x), smid(%d)\n",
                ioc->name, le16_to_cpu(mpi_reply->DevHandle),
            desc_ioc_state, ioc_status, smid);
        pr_warn(MPT3SAS_FMT
                "\trequest_len(%d), underflow(%d), resid(%d)\n",
                ioc->name, scsi_bufflen(scmd), scmd->underflow,
            scsi_get_resid(scmd));
        pr_warn(MPT3SAS_FMT
                "\ttag(%d), transfer_count(%d), sc->result(0x%08x)\n",
                ioc->name, le16_to_cpu(mpi_reply->TaskTag),
            le32_to_cpu(mpi_reply->TransferCount), scmd->result);
        pr_warn(MPT3SAS_FMT
                "\tscsi_status(%s)(0x%02x), scsi_state(%s)(0x%02x)\n",
                ioc->name, desc_scsi_status,
            scsi_status, desc_scsi_state, scsi_state);

        if (scsi_state & MPI2_SCSI_STATE_AUTOSENSE_VALID) {
                struct sense_info data;
                _scsih_normalize_sense(scmd->sense_buffer, &data);
                pr_warn(MPT3SAS_FMT
                  "\t[sense_key,asc,ascq]: [0x%02x,0x%02x,0x%02x], count(%d)\n",
                  ioc->name, data.skey,
                  data.asc, data.ascq, le32_to_cpu(mpi_reply->SenseCount));
        }
        if (scsi_state & MPI2_SCSI_STATE_RESPONSE_INFO_VALID) {
                response_info = le32_to_cpu(mpi_reply->ResponseInfo);
                response_bytes = (u8 *)&response_info;
                _scsih_response_code(ioc, response_bytes[0]);
        }
}

/**
 * _scsih_turn_on_pfa_led - illuminate PFA LED
 * @ioc: per adapter object
 * @handle: device handle
 * Context: process
 */
static void
_scsih_turn_on_pfa_led(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        Mpi2SepReply_t mpi_reply;
        Mpi2SepRequest_t mpi_request;
        struct _sas_device *sas_device;

        sas_device = mpt3sas_get_sdev_by_handle(ioc, handle);
        if (!sas_device)
                return;

        memset(&mpi_request, 0, sizeof(Mpi2SepRequest_t));
        mpi_request.Function = MPI2_FUNCTION_SCSI_ENCLOSURE_PROCESSOR;
        mpi_request.Action = MPI2_SEP_REQ_ACTION_WRITE_STATUS;
        mpi_request.SlotStatus =
            cpu_to_le32(MPI2_SEP_REQ_SLOTSTATUS_PREDICTED_FAULT);
        mpi_request.DevHandle = cpu_to_le16(handle);
        mpi_request.Flags = MPI2_SEP_REQ_FLAGS_DEVHANDLE_ADDRESS;
        if ((mpt3sas_base_scsi_enclosure_processor(ioc, &mpi_reply,
            &mpi_request)) != 0) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n", ioc->name,
                __FILE__, __LINE__, __func__);
                goto out;
        }
        sas_device->pfa_led_on = 1;

        if (mpi_reply.IOCStatus || mpi_reply.IOCLogInfo) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "enclosure_processor: ioc_status (0x%04x), loginfo(0x%08x)\n",
                        ioc->name, le16_to_cpu(mpi_reply.IOCStatus),
                    le32_to_cpu(mpi_reply.IOCLogInfo)));
                goto out;
        }
out:
        sas_device_put(sas_device);
}

/**
 * _scsih_turn_off_pfa_led - turn off Fault LED
 * @ioc: per adapter object
 * @sas_device: sas device whose PFA LED has to turned off
 * Context: process
 */
static void
_scsih_turn_off_pfa_led(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_device *sas_device)
{
        Mpi2SepReply_t mpi_reply;
        Mpi2SepRequest_t mpi_request;

        memset(&mpi_request, 0, sizeof(Mpi2SepRequest_t));
        mpi_request.Function = MPI2_FUNCTION_SCSI_ENCLOSURE_PROCESSOR;
        mpi_request.Action = MPI2_SEP_REQ_ACTION_WRITE_STATUS;
        mpi_request.SlotStatus = 0;
        mpi_request.Slot = cpu_to_le16(sas_device->slot);
        mpi_request.DevHandle = 0;
        mpi_request.EnclosureHandle = cpu_to_le16(sas_device->enclosure_handle);
        mpi_request.Flags = MPI2_SEP_REQ_FLAGS_ENCLOSURE_SLOT_ADDRESS;
        if ((mpt3sas_base_scsi_enclosure_processor(ioc, &mpi_reply,
                &mpi_request)) != 0) {
                printk(MPT3SAS_FMT "failure at %s:%d/%s()!\n", ioc->name,
                __FILE__, __LINE__, __func__);
                return;
        }

        if (mpi_reply.IOCStatus || mpi_reply.IOCLogInfo) {
                dewtprintk(ioc, printk(MPT3SAS_FMT
                 "enclosure_processor: ioc_status (0x%04x), loginfo(0x%08x)\n",
                 ioc->name, le16_to_cpu(mpi_reply.IOCStatus),
                 le32_to_cpu(mpi_reply.IOCLogInfo)));
                return;
        }
}

/**
 * _scsih_send_event_to_turn_on_pfa_led - fire delayed event
 * @ioc: per adapter object
 * @handle: device handle
 * Context: interrupt.
 */
static void
_scsih_send_event_to_turn_on_pfa_led(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct fw_event_work *fw_event;

        fw_event = alloc_fw_event_work(0);
        if (!fw_event)
                return;
        fw_event->event = MPT3SAS_TURN_ON_PFA_LED;
        fw_event->device_handle = handle;
        fw_event->ioc = ioc;
        _scsih_fw_event_add(ioc, fw_event);
        fw_event_work_put(fw_event);
}

/**
 * _scsih_smart_predicted_fault - process smart errors
 * @ioc: per adapter object
 * @handle: device handle
 * Context: interrupt.
 */
static void
_scsih_smart_predicted_fault(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct scsi_target *starget;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        Mpi2EventNotificationReply_t *event_reply;
        Mpi2EventDataSasDeviceStatusChange_t *event_data;
        struct _sas_device *sas_device;
        ssize_t sz;
        unsigned long flags;

        /* only handle non-raid devices */
        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_by_handle(ioc, handle);
        if (!sas_device)
                goto out_unlock;

        starget = sas_device->starget;
        sas_target_priv_data = starget->hostdata;

        if ((sas_target_priv_data->flags & MPT_TARGET_FLAGS_RAID_COMPONENT) ||
           ((sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME)))
                goto out_unlock;

        _scsih_display_enclosure_chassis_info(NULL, sas_device, NULL, starget);

        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

        if (ioc->pdev->subsystem_vendor == PCI_VENDOR_ID_IBM)
                _scsih_send_event_to_turn_on_pfa_led(ioc, handle);

        /* insert into event log */
        sz = offsetof(Mpi2EventNotificationReply_t, EventData) +
             sizeof(Mpi2EventDataSasDeviceStatusChange_t);
        event_reply = kzalloc(sz, GFP_KERNEL);
        if (!event_reply) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }

        event_reply->Function = MPI2_FUNCTION_EVENT_NOTIFICATION;
        event_reply->Event =
            cpu_to_le16(MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE);
        event_reply->MsgLength = sz/4;
        event_reply->EventDataLength =
            cpu_to_le16(sizeof(Mpi2EventDataSasDeviceStatusChange_t)/4);
        event_data = (Mpi2EventDataSasDeviceStatusChange_t *)
            event_reply->EventData;
        event_data->ReasonCode = MPI2_EVENT_SAS_DEV_STAT_RC_SMART_DATA;
        event_data->ASC = 0x5D;
        event_data->DevHandle = cpu_to_le16(handle);
        event_data->SASAddress = cpu_to_le64(sas_target_priv_data->sas_address);
        mpt3sas_ctl_add_to_event_log(ioc, event_reply);
        kfree(event_reply);
out:
        if (sas_device)
                sas_device_put(sas_device);
        return;

out_unlock:
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        goto out;
}

/**
 * _scsih_io_done - scsi request callback
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 *
 * Callback handler when using _scsih_qcmd.
 *
 * Return: 1 meaning mf should be freed from _base_interrupt
 *         0 means the mf is freed from this function.
 */
static u8
_scsih_io_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
{
        Mpi25SCSIIORequest_t *mpi_request;
        Mpi2SCSIIOReply_t *mpi_reply;
        struct scsi_cmnd *scmd;
        struct scsiio_tracker *st;
        u16 ioc_status;
        u32 xfer_cnt;
        u8 scsi_state;
        u8 scsi_status;
        u32 log_info;
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        u32 response_code = 0;

        mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);

        scmd = mpt3sas_scsih_scsi_lookup_get(ioc, smid);
        if (scmd == NULL)
                return 1;

        _scsih_set_satl_pending(scmd, false);

        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);

        if (mpi_reply == NULL) {
                scmd->result = DID_OK << 16;
                goto out;
        }

        sas_device_priv_data = scmd->device->hostdata;
        if (!sas_device_priv_data || !sas_device_priv_data->sas_target ||
             sas_device_priv_data->sas_target->deleted) {
                scmd->result = DID_NO_CONNECT << 16;
                goto out;
        }
        ioc_status = le16_to_cpu(mpi_reply->IOCStatus);

        /*
         * WARPDRIVE: If direct_io is set then it is directIO,
         * the failed direct I/O should be redirected to volume
         */
        st = scsi_cmd_priv(scmd);
        if (st->direct_io &&
             ((ioc_status & MPI2_IOCSTATUS_MASK)
              != MPI2_IOCSTATUS_SCSI_TASK_TERMINATED)) {
                st->direct_io = 0;
                memcpy(mpi_request->CDB.CDB32, scmd->cmnd, scmd->cmd_len);
                mpi_request->DevHandle =
                    cpu_to_le16(sas_device_priv_data->sas_target->handle);
                ioc->put_smid_scsi_io(ioc, smid,
                    sas_device_priv_data->sas_target->handle);
                return 0;
        }
        /* turning off TLR */
        scsi_state = mpi_reply->SCSIState;
        if (scsi_state & MPI2_SCSI_STATE_RESPONSE_INFO_VALID)
                response_code =
                    le32_to_cpu(mpi_reply->ResponseInfo) & 0xFF;
        if (!sas_device_priv_data->tlr_snoop_check) {
                sas_device_priv_data->tlr_snoop_check++;
                if ((!ioc->is_warpdrive &&
                    !scsih_is_raid(&scmd->device->sdev_gendev) &&
                    !scsih_is_nvme(&scmd->device->sdev_gendev))
                    && sas_is_tlr_enabled(scmd->device) &&
                    response_code == MPI2_SCSITASKMGMT_RSP_INVALID_FRAME) {
                        sas_disable_tlr(scmd->device);
                        sdev_printk(KERN_INFO, scmd->device, "TLR disabled\n");
                }
        }

        xfer_cnt = le32_to_cpu(mpi_reply->TransferCount);
        scsi_set_resid(scmd, scsi_bufflen(scmd) - xfer_cnt);
        if (ioc_status & MPI2_IOCSTATUS_FLAG_LOG_INFO_AVAILABLE)
                log_info =  le32_to_cpu(mpi_reply->IOCLogInfo);
        else
                log_info = 0;
        ioc_status &= MPI2_IOCSTATUS_MASK;
        scsi_status = mpi_reply->SCSIStatus;

        if (ioc_status == MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN && xfer_cnt == 0 &&
            (scsi_status == MPI2_SCSI_STATUS_BUSY ||
             scsi_status == MPI2_SCSI_STATUS_RESERVATION_CONFLICT ||
             scsi_status == MPI2_SCSI_STATUS_TASK_SET_FULL)) {
                ioc_status = MPI2_IOCSTATUS_SUCCESS;
        }

        if (scsi_state & MPI2_SCSI_STATE_AUTOSENSE_VALID) {
                struct sense_info data;
                const void *sense_data = mpt3sas_base_get_sense_buffer(ioc,
                    smid);
                u32 sz = min_t(u32, SCSI_SENSE_BUFFERSIZE,
                    le32_to_cpu(mpi_reply->SenseCount));
                memcpy(scmd->sense_buffer, sense_data, sz);
                _scsih_normalize_sense(scmd->sense_buffer, &data);
                /* failure prediction threshold exceeded */
                if (data.asc == 0x5D)
                        _scsih_smart_predicted_fault(ioc,
                            le16_to_cpu(mpi_reply->DevHandle));
                mpt3sas_trigger_scsi(ioc, data.skey, data.asc, data.ascq);

                if ((ioc->logging_level & MPT_DEBUG_REPLY) &&
                     ((scmd->sense_buffer[2] == UNIT_ATTENTION) ||
                     (scmd->sense_buffer[2] == MEDIUM_ERROR) ||
                     (scmd->sense_buffer[2] == HARDWARE_ERROR)))
                        _scsih_scsi_ioc_info(ioc, scmd, mpi_reply, smid);
        }
        switch (ioc_status) {
        case MPI2_IOCSTATUS_BUSY:
        case MPI2_IOCSTATUS_INSUFFICIENT_RESOURCES:
                scmd->result = SAM_STAT_BUSY;
                break;

        case MPI2_IOCSTATUS_SCSI_DEVICE_NOT_THERE:
                scmd->result = DID_NO_CONNECT << 16;
                break;

        case MPI2_IOCSTATUS_SCSI_IOC_TERMINATED:
                if (sas_device_priv_data->block) {
                        scmd->result = DID_TRANSPORT_DISRUPTED << 16;
                        goto out;
                }
                if (log_info == 0x31110630) {
                        if (scmd->retries > 2) {
                                scmd->result = DID_NO_CONNECT << 16;
                                scsi_device_set_state(scmd->device,
                                    SDEV_OFFLINE);
                        } else {
                                scmd->result = DID_SOFT_ERROR << 16;
                                scmd->device->expecting_cc_ua = 1;
                        }
                        break;
                } else if (log_info == VIRTUAL_IO_FAILED_RETRY) {
                        scmd->result = DID_RESET << 16;
                        break;
                } else if ((scmd->device->channel == RAID_CHANNEL) &&
                   (scsi_state == (MPI2_SCSI_STATE_TERMINATED |
                   MPI2_SCSI_STATE_NO_SCSI_STATUS))) {
                        scmd->result = DID_RESET << 16;
                        break;
                }
                scmd->result = DID_SOFT_ERROR << 16;
                break;
        case MPI2_IOCSTATUS_SCSI_TASK_TERMINATED:
        case MPI2_IOCSTATUS_SCSI_EXT_TERMINATED:
                scmd->result = DID_RESET << 16;
                break;

        case MPI2_IOCSTATUS_SCSI_RESIDUAL_MISMATCH:
                if ((xfer_cnt == 0) || (scmd->underflow > xfer_cnt))
                        scmd->result = DID_SOFT_ERROR << 16;
                else
                        scmd->result = (DID_OK << 16) | scsi_status;
                break;

        case MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN:
                scmd->result = (DID_OK << 16) | scsi_status;

                if ((scsi_state & MPI2_SCSI_STATE_AUTOSENSE_VALID))
                        break;

                if (xfer_cnt < scmd->underflow) {
                        if (scsi_status == SAM_STAT_BUSY)
                                scmd->result = SAM_STAT_BUSY;
                        else
                                scmd->result = DID_SOFT_ERROR << 16;
                } else if (scsi_state & (MPI2_SCSI_STATE_AUTOSENSE_FAILED |
                     MPI2_SCSI_STATE_NO_SCSI_STATUS))
                        scmd->result = DID_SOFT_ERROR << 16;
                else if (scsi_state & MPI2_SCSI_STATE_TERMINATED)
                        scmd->result = DID_RESET << 16;
                else if (!xfer_cnt && scmd->cmnd[0] == REPORT_LUNS) {
                        mpi_reply->SCSIState = MPI2_SCSI_STATE_AUTOSENSE_VALID;
                        mpi_reply->SCSIStatus = SAM_STAT_CHECK_CONDITION;
                        scmd->result = (DRIVER_SENSE << 24) |
                            SAM_STAT_CHECK_CONDITION;
                        scmd->sense_buffer[0] = 0x70;
                        scmd->sense_buffer[2] = ILLEGAL_REQUEST;
                        scmd->sense_buffer[12] = 0x20;
                        scmd->sense_buffer[13] = 0;
                }
                break;

        case MPI2_IOCSTATUS_SCSI_DATA_OVERRUN:
                scsi_set_resid(scmd, 0);
                /* fall through */
        case MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR:
        case MPI2_IOCSTATUS_SUCCESS:
                scmd->result = (DID_OK << 16) | scsi_status;
                if (response_code ==
                    MPI2_SCSITASKMGMT_RSP_INVALID_FRAME ||
                    (scsi_state & (MPI2_SCSI_STATE_AUTOSENSE_FAILED |
                     MPI2_SCSI_STATE_NO_SCSI_STATUS)))
                        scmd->result = DID_SOFT_ERROR << 16;
                else if (scsi_state & MPI2_SCSI_STATE_TERMINATED)
                        scmd->result = DID_RESET << 16;
                break;

        case MPI2_IOCSTATUS_EEDP_GUARD_ERROR:
        case MPI2_IOCSTATUS_EEDP_REF_TAG_ERROR:
        case MPI2_IOCSTATUS_EEDP_APP_TAG_ERROR:
                _scsih_eedp_error_handling(scmd, ioc_status);
                break;

        case MPI2_IOCSTATUS_SCSI_PROTOCOL_ERROR:
        case MPI2_IOCSTATUS_INVALID_FUNCTION:
        case MPI2_IOCSTATUS_INVALID_SGL:
        case MPI2_IOCSTATUS_INTERNAL_ERROR:
        case MPI2_IOCSTATUS_INVALID_FIELD:
        case MPI2_IOCSTATUS_INVALID_STATE:
        case MPI2_IOCSTATUS_SCSI_IO_DATA_ERROR:
        case MPI2_IOCSTATUS_SCSI_TASK_MGMT_FAILED:
        case MPI2_IOCSTATUS_INSUFFICIENT_POWER:
        default:
                scmd->result = DID_SOFT_ERROR << 16;
                break;

        }

        if (scmd->result && (ioc->logging_level & MPT_DEBUG_REPLY))
                _scsih_scsi_ioc_info(ioc , scmd, mpi_reply, smid);

 out:

        scsi_dma_unmap(scmd);
        mpt3sas_base_free_smid(ioc, smid);
        scmd->scsi_done(scmd);
        return 0;
}

/**
 * _scsih_sas_host_refresh - refreshing sas host object contents
 * @ioc: per adapter object
 * Context: user
 *
 * During port enable, fw will send topology events for every device. Its
 * possible that the handles may change from the previous setting, so this
 * code keeping handles updating if changed.
 */
static void
_scsih_sas_host_refresh(struct MPT3SAS_ADAPTER *ioc)
{
        u16 sz;
        u16 ioc_status;
        int i;
        Mpi2ConfigReply_t mpi_reply;
        Mpi2SasIOUnitPage0_t *sas_iounit_pg0 = NULL;
        u16 attached_handle;
        u8 link_rate;

        dtmprintk(ioc, pr_info(MPT3SAS_FMT
            "updating handles for sas_host(0x%016llx)\n",
            ioc->name, (unsigned long long)ioc->sas_hba.sas_address));

        sz = offsetof(Mpi2SasIOUnitPage0_t, PhyData) + (ioc->sas_hba.num_phys
            * sizeof(Mpi2SasIOUnit0PhyData_t));
        sas_iounit_pg0 = kzalloc(sz, GFP_KERNEL);
        if (!sas_iounit_pg0) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return;
        }

        if ((mpt3sas_config_get_sas_iounit_pg0(ioc, &mpi_reply,
            sas_iounit_pg0, sz)) != 0)
                goto out;
        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
                goto out;
        for (i = 0; i < ioc->sas_hba.num_phys ; i++) {
                link_rate = sas_iounit_pg0->PhyData[i].NegotiatedLinkRate >> 4;
                if (i == 0)
                        ioc->sas_hba.handle = le16_to_cpu(sas_iounit_pg0->
                            PhyData[0].ControllerDevHandle);
                ioc->sas_hba.phy[i].handle = ioc->sas_hba.handle;
                attached_handle = le16_to_cpu(sas_iounit_pg0->PhyData[i].
                    AttachedDevHandle);
                if (attached_handle && link_rate < MPI2_SAS_NEG_LINK_RATE_1_5)
                        link_rate = MPI2_SAS_NEG_LINK_RATE_1_5;
                mpt3sas_transport_update_links(ioc, ioc->sas_hba.sas_address,
                    attached_handle, i, link_rate);
        }
 out:
        kfree(sas_iounit_pg0);
}

/**
 * _scsih_sas_host_add - create sas host object
 * @ioc: per adapter object
 *
 * Creating host side data object, stored in ioc->sas_hba
 */
static void
_scsih_sas_host_add(struct MPT3SAS_ADAPTER *ioc)
{
        int i;
        Mpi2ConfigReply_t mpi_reply;
        Mpi2SasIOUnitPage0_t *sas_iounit_pg0 = NULL;
        Mpi2SasIOUnitPage1_t *sas_iounit_pg1 = NULL;
        Mpi2SasPhyPage0_t phy_pg0;
        Mpi2SasDevicePage0_t sas_device_pg0;
        Mpi2SasEnclosurePage0_t enclosure_pg0;
        u16 ioc_status;
        u16 sz;
        u8 device_missing_delay;
        u8 num_phys;

        mpt3sas_config_get_number_hba_phys(ioc, &num_phys);
        if (!num_phys) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return;
        }
        ioc->sas_hba.phy = kcalloc(num_phys,
            sizeof(struct _sas_phy), GFP_KERNEL);
        if (!ioc->sas_hba.phy) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }
        ioc->sas_hba.num_phys = num_phys;

        /* sas_iounit page 0 */
        sz = offsetof(Mpi2SasIOUnitPage0_t, PhyData) + (ioc->sas_hba.num_phys *
            sizeof(Mpi2SasIOUnit0PhyData_t));
        sas_iounit_pg0 = kzalloc(sz, GFP_KERNEL);
        if (!sas_iounit_pg0) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return;
        }
        if ((mpt3sas_config_get_sas_iounit_pg0(ioc, &mpi_reply,
            sas_iounit_pg0, sz))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }
        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }

        /* sas_iounit page 1 */
        sz = offsetof(Mpi2SasIOUnitPage1_t, PhyData) + (ioc->sas_hba.num_phys *
            sizeof(Mpi2SasIOUnit1PhyData_t));
        sas_iounit_pg1 = kzalloc(sz, GFP_KERNEL);
        if (!sas_iounit_pg1) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }
        if ((mpt3sas_config_get_sas_iounit_pg1(ioc, &mpi_reply,
            sas_iounit_pg1, sz))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }
        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }

        ioc->io_missing_delay =
            sas_iounit_pg1->IODeviceMissingDelay;
        device_missing_delay =
            sas_iounit_pg1->ReportDeviceMissingDelay;
        if (device_missing_delay & MPI2_SASIOUNIT1_REPORT_MISSING_UNIT_16)
                ioc->device_missing_delay = (device_missing_delay &
                    MPI2_SASIOUNIT1_REPORT_MISSING_TIMEOUT_MASK) * 16;
        else
                ioc->device_missing_delay = device_missing_delay &
                    MPI2_SASIOUNIT1_REPORT_MISSING_TIMEOUT_MASK;

        ioc->sas_hba.parent_dev = &ioc->shost->shost_gendev;
        for (i = 0; i < ioc->sas_hba.num_phys ; i++) {
                if ((mpt3sas_config_get_phy_pg0(ioc, &mpi_reply, &phy_pg0,
                    i))) {
                        pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                            ioc->name, __FILE__, __LINE__, __func__);
                        goto out;
                }
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                            ioc->name, __FILE__, __LINE__, __func__);
                        goto out;
                }

                if (i == 0)
                        ioc->sas_hba.handle = le16_to_cpu(sas_iounit_pg0->
                            PhyData[0].ControllerDevHandle);
                ioc->sas_hba.phy[i].handle = ioc->sas_hba.handle;
                ioc->sas_hba.phy[i].phy_id = i;
                mpt3sas_transport_add_host_phy(ioc, &ioc->sas_hba.phy[i],
                    phy_pg0, ioc->sas_hba.parent_dev);
        }
        if ((mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
            MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, ioc->sas_hba.handle))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }
        ioc->sas_hba.enclosure_handle =
            le16_to_cpu(sas_device_pg0.EnclosureHandle);
        ioc->sas_hba.sas_address = le64_to_cpu(sas_device_pg0.SASAddress);
        pr_info(MPT3SAS_FMT
                "host_add: handle(0x%04x), sas_addr(0x%016llx), phys(%d)\n",
                ioc->name, ioc->sas_hba.handle,
            (unsigned long long) ioc->sas_hba.sas_address,
            ioc->sas_hba.num_phys) ;

        if (ioc->sas_hba.enclosure_handle) {
                if (!(mpt3sas_config_get_enclosure_pg0(ioc, &mpi_reply,
                    &enclosure_pg0, MPI2_SAS_ENCLOS_PGAD_FORM_HANDLE,
                   ioc->sas_hba.enclosure_handle)))
                        ioc->sas_hba.enclosure_logical_id =
                            le64_to_cpu(enclosure_pg0.EnclosureLogicalID);
        }

 out:
        kfree(sas_iounit_pg1);
        kfree(sas_iounit_pg0);
}

/**
 * _scsih_expander_add -  creating expander object
 * @ioc: per adapter object
 * @handle: expander handle
 *
 * Creating expander object, stored in ioc->sas_expander_list.
 *
 * Return: 0 for success, else error.
 */
static int
_scsih_expander_add(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _sas_node *sas_expander;
        struct _enclosure_node *enclosure_dev;
        Mpi2ConfigReply_t mpi_reply;
        Mpi2ExpanderPage0_t expander_pg0;
        Mpi2ExpanderPage1_t expander_pg1;
        u32 ioc_status;
        u16 parent_handle;
        u64 sas_address, sas_address_parent = 0;
        int i;
        unsigned long flags;
        struct _sas_port *mpt3sas_port = NULL;

        int rc = 0;

        if (!handle)
                return -1;

        if (ioc->shost_recovery || ioc->pci_error_recovery)
                return -1;

        if ((mpt3sas_config_get_expander_pg0(ioc, &mpi_reply, &expander_pg0,
            MPI2_SAS_EXPAND_PGAD_FORM_HNDL, handle))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -1;
        }

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -1;
        }

        /* handle out of order topology events */
        parent_handle = le16_to_cpu(expander_pg0.ParentDevHandle);
        if (_scsih_get_sas_address(ioc, parent_handle, &sas_address_parent)
            != 0) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -1;
        }
        if (sas_address_parent != ioc->sas_hba.sas_address) {
                spin_lock_irqsave(&ioc->sas_node_lock, flags);
                sas_expander = mpt3sas_scsih_expander_find_by_sas_address(ioc,
                    sas_address_parent);
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                if (!sas_expander) {
                        rc = _scsih_expander_add(ioc, parent_handle);
                        if (rc != 0)
                                return rc;
                }
        }

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        sas_address = le64_to_cpu(expander_pg0.SASAddress);
        sas_expander = mpt3sas_scsih_expander_find_by_sas_address(ioc,
            sas_address);
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        if (sas_expander)
                return 0;

        sas_expander = kzalloc(sizeof(struct _sas_node),
            GFP_KERNEL);
        if (!sas_expander) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -1;
        }

        sas_expander->handle = handle;
        sas_expander->num_phys = expander_pg0.NumPhys;
        sas_expander->sas_address_parent = sas_address_parent;
        sas_expander->sas_address = sas_address;

        pr_info(MPT3SAS_FMT "expander_add: handle(0x%04x)," \
            " parent(0x%04x), sas_addr(0x%016llx), phys(%d)\n", ioc->name,
            handle, parent_handle, (unsigned long long)
            sas_expander->sas_address, sas_expander->num_phys);

        if (!sas_expander->num_phys)
                goto out_fail;
        sas_expander->phy = kcalloc(sas_expander->num_phys,
            sizeof(struct _sas_phy), GFP_KERNEL);
        if (!sas_expander->phy) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -1;
                goto out_fail;
        }

        INIT_LIST_HEAD(&sas_expander->sas_port_list);
        mpt3sas_port = mpt3sas_transport_port_add(ioc, handle,
            sas_address_parent);
        if (!mpt3sas_port) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -1;
                goto out_fail;
        }
        sas_expander->parent_dev = &mpt3sas_port->rphy->dev;

        for (i = 0 ; i < sas_expander->num_phys ; i++) {
                if ((mpt3sas_config_get_expander_pg1(ioc, &mpi_reply,
                    &expander_pg1, i, handle))) {
                        pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                            ioc->name, __FILE__, __LINE__, __func__);
                        rc = -1;
                        goto out_fail;
                }
                sas_expander->phy[i].handle = handle;
                sas_expander->phy[i].phy_id = i;

                if ((mpt3sas_transport_add_expander_phy(ioc,
                    &sas_expander->phy[i], expander_pg1,
                    sas_expander->parent_dev))) {
                        pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                            ioc->name, __FILE__, __LINE__, __func__);
                        rc = -1;
                        goto out_fail;
                }
        }

        if (sas_expander->enclosure_handle) {
                enclosure_dev =
                        mpt3sas_scsih_enclosure_find_by_handle(ioc,
                                                sas_expander->enclosure_handle);
                if (enclosure_dev)
                        sas_expander->enclosure_logical_id =
                            le64_to_cpu(enclosure_dev->pg0.EnclosureLogicalID);
        }

        _scsih_expander_node_add(ioc, sas_expander);
        return 0;

 out_fail:

        if (mpt3sas_port)
                mpt3sas_transport_port_remove(ioc, sas_expander->sas_address,
                    sas_address_parent);
        kfree(sas_expander);
        return rc;
}

/**
 * mpt3sas_expander_remove - removing expander object
 * @ioc: per adapter object
 * @sas_address: expander sas_address
 */
void
mpt3sas_expander_remove(struct MPT3SAS_ADAPTER *ioc, u64 sas_address)
{
        struct _sas_node *sas_expander;
        unsigned long flags;

        if (ioc->shost_recovery)
                return;

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        sas_expander = mpt3sas_scsih_expander_find_by_sas_address(ioc,
            sas_address);
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
        if (sas_expander)
                _scsih_expander_node_remove(ioc, sas_expander);
}

/**
 * _scsih_done -  internal SCSI_IO callback handler.
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 *
 * Callback handler when sending internal generated SCSI_IO.
 * The callback index passed is `ioc->scsih_cb_idx`
 *
 * Return: 1 meaning mf should be freed from _base_interrupt
 *         0 means the mf is freed from this function.
 */
static u8
_scsih_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
{
        MPI2DefaultReply_t *mpi_reply;

        mpi_reply =  mpt3sas_base_get_reply_virt_addr(ioc, reply);
        if (ioc->scsih_cmds.status == MPT3_CMD_NOT_USED)
                return 1;
        if (ioc->scsih_cmds.smid != smid)
                return 1;
        ioc->scsih_cmds.status |= MPT3_CMD_COMPLETE;
        if (mpi_reply) {
                memcpy(ioc->scsih_cmds.reply, mpi_reply,
                    mpi_reply->MsgLength*4);
                ioc->scsih_cmds.status |= MPT3_CMD_REPLY_VALID;
        }
        ioc->scsih_cmds.status &= ~MPT3_CMD_PENDING;
        complete(&ioc->scsih_cmds.done);
        return 1;
}




#define MPT3_MAX_LUNS (255)


/**
 * _scsih_check_access_status - check access flags
 * @ioc: per adapter object
 * @sas_address: sas address
 * @handle: sas device handle
 * @access_status: errors returned during discovery of the device
 *
 * Return: 0 for success, else failure
 */
static u8
_scsih_check_access_status(struct MPT3SAS_ADAPTER *ioc, u64 sas_address,
        u16 handle, u8 access_status)
{
        u8 rc = 1;
        char *desc = NULL;

        switch (access_status) {
        case MPI2_SAS_DEVICE0_ASTATUS_NO_ERRORS:
        case MPI2_SAS_DEVICE0_ASTATUS_SATA_NEEDS_INITIALIZATION:
                rc = 0;
                break;
        case MPI2_SAS_DEVICE0_ASTATUS_SATA_CAPABILITY_FAILED:
                desc = "sata capability failed";
                break;
        case MPI2_SAS_DEVICE0_ASTATUS_SATA_AFFILIATION_CONFLICT:
                desc = "sata affiliation conflict";
                break;
        case MPI2_SAS_DEVICE0_ASTATUS_ROUTE_NOT_ADDRESSABLE:
                desc = "route not addressable";
                break;
        case MPI2_SAS_DEVICE0_ASTATUS_SMP_ERROR_NOT_ADDRESSABLE:
                desc = "smp error not addressable";
                break;
        case MPI2_SAS_DEVICE0_ASTATUS_DEVICE_BLOCKED:
                desc = "device blocked";
                break;
        case MPI2_SAS_DEVICE0_ASTATUS_SATA_INIT_FAILED:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_UNKNOWN:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_AFFILIATION_CONFLICT:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_DIAG:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_IDENTIFICATION:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_CHECK_POWER:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_PIO_SN:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_MDMA_SN:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_UDMA_SN:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_ZONING_VIOLATION:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_NOT_ADDRESSABLE:
        case MPI2_SAS_DEVICE0_ASTATUS_SIF_MAX:
                desc = "sata initialization failed";
                break;
        default:
                desc = "unknown";
                break;
        }

        if (!rc)
                return 0;

        pr_err(MPT3SAS_FMT
                "discovery errors(%s): sas_address(0x%016llx), handle(0x%04x)\n",
                ioc->name, desc, (unsigned long long)sas_address, handle);
        return rc;
}

/**
 * _scsih_check_device - checking device responsiveness
 * @ioc: per adapter object
 * @parent_sas_address: sas address of parent expander or sas host
 * @handle: attached device handle
 * @phy_number: phy number
 * @link_rate: new link rate
 */
static void
_scsih_check_device(struct MPT3SAS_ADAPTER *ioc,
        u64 parent_sas_address, u16 handle, u8 phy_number, u8 link_rate)
{
        Mpi2ConfigReply_t mpi_reply;
        Mpi2SasDevicePage0_t sas_device_pg0;
        struct _sas_device *sas_device;
        struct _enclosure_node *enclosure_dev = NULL;
        u32 ioc_status;
        unsigned long flags;
        u64 sas_address;
        struct scsi_target *starget;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        u32 device_info;

        if ((mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
            MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle)))
                return;

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
                return;

        /* wide port handling ~ we need only handle device once for the phy that
         * is matched in sas device page zero
         */
        if (phy_number != sas_device_pg0.PhyNum)
                return;

        /* check if this is end device */
        device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);
        if (!(_scsih_is_end_device(device_info)))
                return;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_address = le64_to_cpu(sas_device_pg0.SASAddress);
        sas_device = __mpt3sas_get_sdev_by_addr(ioc,
            sas_address);

        if (!sas_device)
                goto out_unlock;

        if (unlikely(sas_device->handle != handle)) {
                starget = sas_device->starget;
                sas_target_priv_data = starget->hostdata;
                starget_printk(KERN_INFO, starget,
                        "handle changed from(0x%04x) to (0x%04x)!!!\n",
                        sas_device->handle, handle);
                sas_target_priv_data->handle = handle;
                sas_device->handle = handle;
                if (le16_to_cpu(sas_device_pg0.Flags) &
                     MPI2_SAS_DEVICE0_FLAGS_ENCL_LEVEL_VALID) {
                        sas_device->enclosure_level =
                                sas_device_pg0.EnclosureLevel;
                        memcpy(sas_device->connector_name,
                                sas_device_pg0.ConnectorName, 4);
                        sas_device->connector_name[4] = '\0';
                } else {
                        sas_device->enclosure_level = 0;
                        sas_device->connector_name[0] = '\0';
                }

                sas_device->enclosure_handle =
                                le16_to_cpu(sas_device_pg0.EnclosureHandle);
                sas_device->is_chassis_slot_valid = 0;
                enclosure_dev = mpt3sas_scsih_enclosure_find_by_handle(ioc,
                                                sas_device->enclosure_handle);
                if (enclosure_dev) {
                        sas_device->enclosure_logical_id =
                            le64_to_cpu(enclosure_dev->pg0.EnclosureLogicalID);
                        if (le16_to_cpu(enclosure_dev->pg0.Flags) &
                            MPI2_SAS_ENCLS0_FLAGS_CHASSIS_SLOT_VALID) {
                                sas_device->is_chassis_slot_valid = 1;
                                sas_device->chassis_slot =
                                        enclosure_dev->pg0.ChassisSlot;
                        }
                }
        }

        /* check if device is present */
        if (!(le16_to_cpu(sas_device_pg0.Flags) &
            MPI2_SAS_DEVICE0_FLAGS_DEVICE_PRESENT)) {
                pr_err(MPT3SAS_FMT
                        "device is not present handle(0x%04x), flags!!!\n",
                        ioc->name, handle);
                goto out_unlock;
        }

        /* check if there were any issues with discovery */
        if (_scsih_check_access_status(ioc, sas_address, handle,
            sas_device_pg0.AccessStatus))
                goto out_unlock;

        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        _scsih_ublock_io_device(ioc, sas_address);

        if (sas_device)
                sas_device_put(sas_device);
        return;

out_unlock:
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        if (sas_device)
                sas_device_put(sas_device);
}

/**
 * _scsih_add_device -  creating sas device object
 * @ioc: per adapter object
 * @handle: sas device handle
 * @phy_num: phy number end device attached to
 * @is_pd: is this hidden raid component
 *
 * Creating end device object, stored in ioc->sas_device_list.
 *
 * Return: 0 for success, non-zero for failure.
 */
static int
_scsih_add_device(struct MPT3SAS_ADAPTER *ioc, u16 handle, u8 phy_num,
        u8 is_pd)
{
        Mpi2ConfigReply_t mpi_reply;
        Mpi2SasDevicePage0_t sas_device_pg0;
        struct _sas_device *sas_device;
        struct _enclosure_node *enclosure_dev = NULL;
        u32 ioc_status;
        u64 sas_address;
        u32 device_info;

        if ((mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
            MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -1;
        }

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -1;
        }

        /* check if this is end device */
        device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);
        if (!(_scsih_is_end_device(device_info)))
                return -1;
        set_bit(handle, ioc->pend_os_device_add);
        sas_address = le64_to_cpu(sas_device_pg0.SASAddress);

        /* check if device is present */
        if (!(le16_to_cpu(sas_device_pg0.Flags) &
            MPI2_SAS_DEVICE0_FLAGS_DEVICE_PRESENT)) {
                pr_err(MPT3SAS_FMT "device is not present handle(0x04%x)!!!\n",
                        ioc->name, handle);
                return -1;
        }

        /* check if there were any issues with discovery */
        if (_scsih_check_access_status(ioc, sas_address, handle,
            sas_device_pg0.AccessStatus))
                return -1;

        sas_device = mpt3sas_get_sdev_by_addr(ioc,
                                        sas_address);
        if (sas_device) {
                clear_bit(handle, ioc->pend_os_device_add);
                sas_device_put(sas_device);
                return -1;
        }

        if (sas_device_pg0.EnclosureHandle) {
                enclosure_dev =
                        mpt3sas_scsih_enclosure_find_by_handle(ioc,
                            le16_to_cpu(sas_device_pg0.EnclosureHandle));
                if (enclosure_dev == NULL)
                        pr_info(MPT3SAS_FMT "Enclosure handle(0x%04x)"
                            "doesn't match with enclosure device!\n",
                            ioc->name, sas_device_pg0.EnclosureHandle);
        }

        sas_device = kzalloc(sizeof(struct _sas_device),
            GFP_KERNEL);
        if (!sas_device) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return 0;
        }

        kref_init(&sas_device->refcount);
        sas_device->handle = handle;
        if (_scsih_get_sas_address(ioc,
            le16_to_cpu(sas_device_pg0.ParentDevHandle),
            &sas_device->sas_address_parent) != 0)
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
        sas_device->enclosure_handle =
            le16_to_cpu(sas_device_pg0.EnclosureHandle);
        if (sas_device->enclosure_handle != 0)
                sas_device->slot =
                    le16_to_cpu(sas_device_pg0.Slot);
        sas_device->device_info = device_info;
        sas_device->sas_address = sas_address;
        sas_device->phy = sas_device_pg0.PhyNum;
        sas_device->fast_path = (le16_to_cpu(sas_device_pg0.Flags) &
            MPI25_SAS_DEVICE0_FLAGS_FAST_PATH_CAPABLE) ? 1 : 0;

        if (le16_to_cpu(sas_device_pg0.Flags)
                & MPI2_SAS_DEVICE0_FLAGS_ENCL_LEVEL_VALID) {
                sas_device->enclosure_level =
                        sas_device_pg0.EnclosureLevel;
                memcpy(sas_device->connector_name,
                        sas_device_pg0.ConnectorName, 4);
                sas_device->connector_name[4] = '\0';
        } else {
                sas_device->enclosure_level = 0;
                sas_device->connector_name[0] = '\0';
        }
        /* get enclosure_logical_id & chassis_slot*/
        sas_device->is_chassis_slot_valid = 0;
        if (enclosure_dev) {
                sas_device->enclosure_logical_id =
                    le64_to_cpu(enclosure_dev->pg0.EnclosureLogicalID);
                if (le16_to_cpu(enclosure_dev->pg0.Flags) &
                    MPI2_SAS_ENCLS0_FLAGS_CHASSIS_SLOT_VALID) {
                        sas_device->is_chassis_slot_valid = 1;
                        sas_device->chassis_slot =
                                        enclosure_dev->pg0.ChassisSlot;
                }
        }

        /* get device name */
        sas_device->device_name = le64_to_cpu(sas_device_pg0.DeviceName);

        if (ioc->wait_for_discovery_to_complete)
                _scsih_sas_device_init_add(ioc, sas_device);
        else
                _scsih_sas_device_add(ioc, sas_device);

        sas_device_put(sas_device);
        return 0;
}

/**
 * _scsih_remove_device -  removing sas device object
 * @ioc: per adapter object
 * @sas_device: the sas_device object
 */
static void
_scsih_remove_device(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_device *sas_device)
{
        struct MPT3SAS_TARGET *sas_target_priv_data;

        if ((ioc->pdev->subsystem_vendor == PCI_VENDOR_ID_IBM) &&
             (sas_device->pfa_led_on)) {
                _scsih_turn_off_pfa_led(ioc, sas_device);
                sas_device->pfa_led_on = 0;
        }

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "%s: enter: handle(0x%04x), sas_addr(0x%016llx)\n",
                ioc->name, __func__,
            sas_device->handle, (unsigned long long)
            sas_device->sas_address));

        dewtprintk(ioc, _scsih_display_enclosure_chassis_info(ioc, sas_device,
            NULL, NULL));

        if (sas_device->starget && sas_device->starget->hostdata) {
                sas_target_priv_data = sas_device->starget->hostdata;
                sas_target_priv_data->deleted = 1;
                _scsih_ublock_io_device(ioc, sas_device->sas_address);
                sas_target_priv_data->handle =
                     MPT3SAS_INVALID_DEVICE_HANDLE;
        }

        if (!ioc->hide_drives)
                mpt3sas_transport_port_remove(ioc,
                    sas_device->sas_address,
                    sas_device->sas_address_parent);

        pr_info(MPT3SAS_FMT
                "removing handle(0x%04x), sas_addr(0x%016llx)\n",
                ioc->name, sas_device->handle,
            (unsigned long long) sas_device->sas_address);

        _scsih_display_enclosure_chassis_info(ioc, sas_device, NULL, NULL);

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                "%s: exit: handle(0x%04x), sas_addr(0x%016llx)\n",
                ioc->name, __func__,
                sas_device->handle, (unsigned long long)
                sas_device->sas_address));
        dewtprintk(ioc, _scsih_display_enclosure_chassis_info(ioc, sas_device,
            NULL, NULL));
}

/**
 * _scsih_sas_topology_change_event_debug - debug for topology event
 * @ioc: per adapter object
 * @event_data: event data payload
 * Context: user.
 */
static void
_scsih_sas_topology_change_event_debug(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataSasTopologyChangeList_t *event_data)
{
        int i;
        u16 handle;
        u16 reason_code;
        u8 phy_number;
        char *status_str = NULL;
        u8 link_rate, prev_link_rate;

        switch (event_data->ExpStatus) {
        case MPI2_EVENT_SAS_TOPO_ES_ADDED:
                status_str = "add";
                break;
        case MPI2_EVENT_SAS_TOPO_ES_NOT_RESPONDING:
                status_str = "remove";
                break;
        case MPI2_EVENT_SAS_TOPO_ES_RESPONDING:
        case 0:
                status_str =  "responding";
                break;
        case MPI2_EVENT_SAS_TOPO_ES_DELAY_NOT_RESPONDING:
                status_str = "remove delay";
                break;
        default:
                status_str = "unknown status";
                break;
        }
        pr_info(MPT3SAS_FMT "sas topology change: (%s)\n",
            ioc->name, status_str);
        pr_info("\thandle(0x%04x), enclosure_handle(0x%04x) " \
            "start_phy(%02d), count(%d)\n",
            le16_to_cpu(event_data->ExpanderDevHandle),
            le16_to_cpu(event_data->EnclosureHandle),
            event_data->StartPhyNum, event_data->NumEntries);
        for (i = 0; i < event_data->NumEntries; i++) {
                handle = le16_to_cpu(event_data->PHY[i].AttachedDevHandle);
                if (!handle)
                        continue;
                phy_number = event_data->StartPhyNum + i;
                reason_code = event_data->PHY[i].PhyStatus &
                    MPI2_EVENT_SAS_TOPO_RC_MASK;
                switch (reason_code) {
                case MPI2_EVENT_SAS_TOPO_RC_TARG_ADDED:
                        status_str = "target add";
                        break;
                case MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING:
                        status_str = "target remove";
                        break;
                case MPI2_EVENT_SAS_TOPO_RC_DELAY_NOT_RESPONDING:
                        status_str = "delay target remove";
                        break;
                case MPI2_EVENT_SAS_TOPO_RC_PHY_CHANGED:
                        status_str = "link rate change";
                        break;
                case MPI2_EVENT_SAS_TOPO_RC_NO_CHANGE:
                        status_str = "target responding";
                        break;
                default:
                        status_str = "unknown";
                        break;
                }
                link_rate = event_data->PHY[i].LinkRate >> 4;
                prev_link_rate = event_data->PHY[i].LinkRate & 0xF;
                pr_info("\tphy(%02d), attached_handle(0x%04x): %s:" \
                    " link rate: new(0x%02x), old(0x%02x)\n", phy_number,
                    handle, status_str, link_rate, prev_link_rate);

        }
}

/**
 * _scsih_sas_topology_change_event - handle topology changes
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 *
 */
static int
_scsih_sas_topology_change_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        int i;
        u16 parent_handle, handle;
        u16 reason_code;
        u8 phy_number, max_phys;
        struct _sas_node *sas_expander;
        u64 sas_address;
        unsigned long flags;
        u8 link_rate, prev_link_rate;
        Mpi2EventDataSasTopologyChangeList_t *event_data =
                (Mpi2EventDataSasTopologyChangeList_t *)
                fw_event->event_data;

        if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
                _scsih_sas_topology_change_event_debug(ioc, event_data);

        if (ioc->shost_recovery || ioc->remove_host || ioc->pci_error_recovery)
                return 0;

        if (!ioc->sas_hba.num_phys)
                _scsih_sas_host_add(ioc);
        else
                _scsih_sas_host_refresh(ioc);

        if (fw_event->ignore) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "ignoring expander event\n", ioc->name));
                return 0;
        }

        parent_handle = le16_to_cpu(event_data->ExpanderDevHandle);

        /* handle expander add */
        if (event_data->ExpStatus == MPI2_EVENT_SAS_TOPO_ES_ADDED)
                if (_scsih_expander_add(ioc, parent_handle) != 0)
                        return 0;

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        sas_expander = mpt3sas_scsih_expander_find_by_handle(ioc,
            parent_handle);
        if (sas_expander) {
                sas_address = sas_expander->sas_address;
                max_phys = sas_expander->num_phys;
        } else if (parent_handle < ioc->sas_hba.num_phys) {
                sas_address = ioc->sas_hba.sas_address;
                max_phys = ioc->sas_hba.num_phys;
        } else {
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                return 0;
        }
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        /* handle siblings events */
        for (i = 0; i < event_data->NumEntries; i++) {
                if (fw_event->ignore) {
                        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                "ignoring expander event\n", ioc->name));
                        return 0;
                }
                if (ioc->remove_host || ioc->pci_error_recovery)
                        return 0;
                phy_number = event_data->StartPhyNum + i;
                if (phy_number >= max_phys)
                        continue;
                reason_code = event_data->PHY[i].PhyStatus &
                    MPI2_EVENT_SAS_TOPO_RC_MASK;
                if ((event_data->PHY[i].PhyStatus &
                    MPI2_EVENT_SAS_TOPO_PHYSTATUS_VACANT) && (reason_code !=
                    MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING))
                                continue;
                handle = le16_to_cpu(event_data->PHY[i].AttachedDevHandle);
                if (!handle)
                        continue;
                link_rate = event_data->PHY[i].LinkRate >> 4;
                prev_link_rate = event_data->PHY[i].LinkRate & 0xF;
                switch (reason_code) {
                case MPI2_EVENT_SAS_TOPO_RC_PHY_CHANGED:

                        if (ioc->shost_recovery)
                                break;

                        if (link_rate == prev_link_rate)
                                break;

                        mpt3sas_transport_update_links(ioc, sas_address,
                            handle, phy_number, link_rate);

                        if (link_rate < MPI2_SAS_NEG_LINK_RATE_1_5)
                                break;

                        _scsih_check_device(ioc, sas_address, handle,
                            phy_number, link_rate);

                        if (!test_bit(handle, ioc->pend_os_device_add))
                                break;

                        /* fall through */

                case MPI2_EVENT_SAS_TOPO_RC_TARG_ADDED:

                        if (ioc->shost_recovery)
                                break;

                        mpt3sas_transport_update_links(ioc, sas_address,
                            handle, phy_number, link_rate);

                        _scsih_add_device(ioc, handle, phy_number, 0);

                        break;
                case MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING:

                        _scsih_device_remove_by_handle(ioc, handle);
                        break;
                }
        }

        /* handle expander removal */
        if (event_data->ExpStatus == MPI2_EVENT_SAS_TOPO_ES_NOT_RESPONDING &&
            sas_expander)
                mpt3sas_expander_remove(ioc, sas_address);

        return 0;
}

/**
 * _scsih_sas_device_status_change_event_debug - debug for device event
 * @ioc: ?
 * @event_data: event data payload
 * Context: user.
 */
static void
_scsih_sas_device_status_change_event_debug(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataSasDeviceStatusChange_t *event_data)
{
        char *reason_str = NULL;

        switch (event_data->ReasonCode) {
        case MPI2_EVENT_SAS_DEV_STAT_RC_SMART_DATA:
                reason_str = "smart data";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_UNSUPPORTED:
                reason_str = "unsupported device discovered";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_INTERNAL_DEVICE_RESET:
                reason_str = "internal device reset";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_TASK_ABORT_INTERNAL:
                reason_str = "internal task abort";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_ABORT_TASK_SET_INTERNAL:
                reason_str = "internal task abort set";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_CLEAR_TASK_SET_INTERNAL:
                reason_str = "internal clear task set";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_QUERY_TASK_INTERNAL:
                reason_str = "internal query task";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_SATA_INIT_FAILURE:
                reason_str = "sata init failure";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_CMP_INTERNAL_DEV_RESET:
                reason_str = "internal device reset complete";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_CMP_TASK_ABORT_INTERNAL:
                reason_str = "internal task abort complete";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_ASYNC_NOTIFICATION:
                reason_str = "internal async notification";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_EXPANDER_REDUCED_FUNCTIONALITY:
                reason_str = "expander reduced functionality";
                break;
        case MPI2_EVENT_SAS_DEV_STAT_RC_CMP_EXPANDER_REDUCED_FUNCTIONALITY:
                reason_str = "expander reduced functionality complete";
                break;
        default:
                reason_str = "unknown reason";
                break;
        }
        pr_info(MPT3SAS_FMT "device status change: (%s)\n"
            "\thandle(0x%04x), sas address(0x%016llx), tag(%d)",
            ioc->name, reason_str, le16_to_cpu(event_data->DevHandle),
            (unsigned long long)le64_to_cpu(event_data->SASAddress),
            le16_to_cpu(event_data->TaskTag));
        if (event_data->ReasonCode == MPI2_EVENT_SAS_DEV_STAT_RC_SMART_DATA)
                pr_info(MPT3SAS_FMT ", ASC(0x%x), ASCQ(0x%x)\n", ioc->name,
                    event_data->ASC, event_data->ASCQ);
        pr_info("\n");
}

/**
 * _scsih_sas_device_status_change_event - handle device status change
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_sas_device_status_change_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        struct MPT3SAS_TARGET *target_priv_data;
        struct _sas_device *sas_device;
        u64 sas_address;
        unsigned long flags;
        Mpi2EventDataSasDeviceStatusChange_t *event_data =
                (Mpi2EventDataSasDeviceStatusChange_t *)
                fw_event->event_data;

        if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
                _scsih_sas_device_status_change_event_debug(ioc,
                     event_data);

        /* In MPI Revision K (0xC), the internal device reset complete was
         * implemented, so avoid setting tm_busy flag for older firmware.
         */
        if ((ioc->facts.HeaderVersion >> 8) < 0xC)
                return;

        if (event_data->ReasonCode !=
            MPI2_EVENT_SAS_DEV_STAT_RC_INTERNAL_DEVICE_RESET &&
           event_data->ReasonCode !=
            MPI2_EVENT_SAS_DEV_STAT_RC_CMP_INTERNAL_DEV_RESET)
                return;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_address = le64_to_cpu(event_data->SASAddress);
        sas_device = __mpt3sas_get_sdev_by_addr(ioc,
            sas_address);

        if (!sas_device || !sas_device->starget)
                goto out;

        target_priv_data = sas_device->starget->hostdata;
        if (!target_priv_data)
                goto out;

        if (event_data->ReasonCode ==
            MPI2_EVENT_SAS_DEV_STAT_RC_INTERNAL_DEVICE_RESET)
                target_priv_data->tm_busy = 1;
        else
                target_priv_data->tm_busy = 0;

out:
        if (sas_device)
                sas_device_put(sas_device);

        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
}


/**
 * _scsih_check_pcie_access_status - check access flags
 * @ioc: per adapter object
 * @wwid: wwid
 * @handle: sas device handle
 * @access_status: errors returned during discovery of the device
 *
 * Return: 0 for success, else failure
 */
static u8
_scsih_check_pcie_access_status(struct MPT3SAS_ADAPTER *ioc, u64 wwid,
        u16 handle, u8 access_status)
{
        u8 rc = 1;
        char *desc = NULL;

        switch (access_status) {
        case MPI26_PCIEDEV0_ASTATUS_NO_ERRORS:
        case MPI26_PCIEDEV0_ASTATUS_NEEDS_INITIALIZATION:
                rc = 0;
                break;
        case MPI26_PCIEDEV0_ASTATUS_CAPABILITY_FAILED:
                desc = "PCIe device capability failed";
                break;
        case MPI26_PCIEDEV0_ASTATUS_DEVICE_BLOCKED:
                desc = "PCIe device blocked";
                break;
        case MPI26_PCIEDEV0_ASTATUS_MEMORY_SPACE_ACCESS_FAILED:
                desc = "PCIe device mem space access failed";
                break;
        case MPI26_PCIEDEV0_ASTATUS_UNSUPPORTED_DEVICE:
                desc = "PCIe device unsupported";
                break;
        case MPI26_PCIEDEV0_ASTATUS_MSIX_REQUIRED:
                desc = "PCIe device MSIx Required";
                break;
        case MPI26_PCIEDEV0_ASTATUS_INIT_FAIL_MAX:
                desc = "PCIe device init fail max";
                break;
        case MPI26_PCIEDEV0_ASTATUS_UNKNOWN:
                desc = "PCIe device status unknown";
                break;
        case MPI26_PCIEDEV0_ASTATUS_NVME_READY_TIMEOUT:
                desc = "nvme ready timeout";
                break;
        case MPI26_PCIEDEV0_ASTATUS_NVME_DEVCFG_UNSUPPORTED:
                desc = "nvme device configuration unsupported";
                break;
        case MPI26_PCIEDEV0_ASTATUS_NVME_IDENTIFY_FAILED:
                desc = "nvme identify failed";
                break;
        case MPI26_PCIEDEV0_ASTATUS_NVME_QCONFIG_FAILED:
                desc = "nvme qconfig failed";
                break;
        case MPI26_PCIEDEV0_ASTATUS_NVME_QCREATION_FAILED:
                desc = "nvme qcreation failed";
                break;
        case MPI26_PCIEDEV0_ASTATUS_NVME_EVENTCFG_FAILED:
                desc = "nvme eventcfg failed";
                break;
        case MPI26_PCIEDEV0_ASTATUS_NVME_GET_FEATURE_STAT_FAILED:
                desc = "nvme get feature stat failed";
                break;
        case MPI26_PCIEDEV0_ASTATUS_NVME_IDLE_TIMEOUT:
                desc = "nvme idle timeout";
                break;
        case MPI26_PCIEDEV0_ASTATUS_NVME_FAILURE_STATUS:
                desc = "nvme failure status";
                break;
        default:
                pr_err(MPT3SAS_FMT
                    " NVMe discovery error(0x%02x): wwid(0x%016llx),"
                        "handle(0x%04x)\n", ioc->name, access_status,
                        (unsigned long long)wwid, handle);
                return rc;
        }

        if (!rc)
                return rc;

        pr_info(MPT3SAS_FMT
                "NVMe discovery error(%s): wwid(0x%016llx), handle(0x%04x)\n",
                        ioc->name, desc,
                        (unsigned long long)wwid, handle);
        return rc;
}

/**
 * _scsih_pcie_device_remove_from_sml -  removing pcie device
 * from SML and free up associated memory
 * @ioc: per adapter object
 * @pcie_device: the pcie_device object
 */
static void
_scsih_pcie_device_remove_from_sml(struct MPT3SAS_ADAPTER *ioc,
        struct _pcie_device *pcie_device)
{
        struct MPT3SAS_TARGET *sas_target_priv_data;

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
            "%s: enter: handle(0x%04x), wwid(0x%016llx)\n", ioc->name, __func__,
            pcie_device->handle, (unsigned long long)
            pcie_device->wwid));
        if (pcie_device->enclosure_handle != 0)
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "%s: enter: enclosure logical id(0x%016llx), slot(%d)\n",
                    ioc->name, __func__,
                    (unsigned long long)pcie_device->enclosure_logical_id,
                    pcie_device->slot));
        if (pcie_device->connector_name[0] != '\0')
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "%s: enter: enclosure level(0x%04x), connector name( %s)\n",
                    ioc->name, __func__,
                    pcie_device->enclosure_level,
                    pcie_device->connector_name));

        if (pcie_device->starget && pcie_device->starget->hostdata) {
                sas_target_priv_data = pcie_device->starget->hostdata;
                sas_target_priv_data->deleted = 1;
                _scsih_ublock_io_device(ioc, pcie_device->wwid);
                sas_target_priv_data->handle = MPT3SAS_INVALID_DEVICE_HANDLE;
        }

        pr_info(MPT3SAS_FMT
                "removing handle(0x%04x), wwid (0x%016llx)\n",
                ioc->name, pcie_device->handle,
                (unsigned long long) pcie_device->wwid);
        if (pcie_device->enclosure_handle != 0)
                pr_info(MPT3SAS_FMT
                    "removing : enclosure logical id(0x%016llx), slot(%d)\n",
                    ioc->name,
                    (unsigned long long)pcie_device->enclosure_logical_id,
                    pcie_device->slot);
        if (pcie_device->connector_name[0] != '\0')
                pr_info(MPT3SAS_FMT
                    "removing: enclosure level(0x%04x), connector name( %s)\n",
                    ioc->name, pcie_device->enclosure_level,
                    pcie_device->connector_name);

        if (pcie_device->starget)
                scsi_remove_target(&pcie_device->starget->dev);
        dewtprintk(ioc, pr_info(MPT3SAS_FMT
            "%s: exit: handle(0x%04x), wwid(0x%016llx)\n", ioc->name, __func__,
            pcie_device->handle, (unsigned long long)
            pcie_device->wwid));
        if (pcie_device->enclosure_handle != 0)
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: exit: enclosure logical id(0x%016llx), slot(%d)\n",
                        ioc->name, __func__,
                        (unsigned long long)pcie_device->enclosure_logical_id,
                        pcie_device->slot));
        if (pcie_device->connector_name[0] != '\0')
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "%s: exit: enclosure level(0x%04x), connector name( %s)\n",
                    ioc->name, __func__, pcie_device->enclosure_level,
                    pcie_device->connector_name));

        kfree(pcie_device->serial_number);
}


/**
 * _scsih_pcie_check_device - checking device responsiveness
 * @ioc: per adapter object
 * @handle: attached device handle
 */
static void
_scsih_pcie_check_device(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        Mpi2ConfigReply_t mpi_reply;
        Mpi26PCIeDevicePage0_t pcie_device_pg0;
        u32 ioc_status;
        struct _pcie_device *pcie_device;
        u64 wwid;
        unsigned long flags;
        struct scsi_target *starget;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        u32 device_info;

        if ((mpt3sas_config_get_pcie_device_pg0(ioc, &mpi_reply,
                &pcie_device_pg0, MPI26_PCIE_DEVICE_PGAD_FORM_HANDLE, handle)))
                return;

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
                return;

        /* check if this is end device */
        device_info = le32_to_cpu(pcie_device_pg0.DeviceInfo);
        if (!(_scsih_is_nvme_device(device_info)))
                return;

        wwid = le64_to_cpu(pcie_device_pg0.WWID);
        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        pcie_device = __mpt3sas_get_pdev_by_wwid(ioc, wwid);

        if (!pcie_device) {
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
                return;
        }

        if (unlikely(pcie_device->handle != handle)) {
                starget = pcie_device->starget;
                sas_target_priv_data = starget->hostdata;
                starget_printk(KERN_INFO, starget,
                    "handle changed from(0x%04x) to (0x%04x)!!!\n",
                    pcie_device->handle, handle);
                sas_target_priv_data->handle = handle;
                pcie_device->handle = handle;

                if (le32_to_cpu(pcie_device_pg0.Flags) &
                    MPI26_PCIEDEV0_FLAGS_ENCL_LEVEL_VALID) {
                        pcie_device->enclosure_level =
                            pcie_device_pg0.EnclosureLevel;
                        memcpy(&pcie_device->connector_name[0],
                            &pcie_device_pg0.ConnectorName[0], 4);
                } else {
                        pcie_device->enclosure_level = 0;
                        pcie_device->connector_name[0] = '\0';
                }
        }

        /* check if device is present */
        if (!(le32_to_cpu(pcie_device_pg0.Flags) &
            MPI26_PCIEDEV0_FLAGS_DEVICE_PRESENT)) {
                pr_info(MPT3SAS_FMT
                    "device is not present handle(0x%04x), flags!!!\n",
                    ioc->name, handle);
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
                pcie_device_put(pcie_device);
                return;
        }

        /* check if there were any issues with discovery */
        if (_scsih_check_pcie_access_status(ioc, wwid, handle,
            pcie_device_pg0.AccessStatus)) {
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
                pcie_device_put(pcie_device);
                return;
        }

        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
        pcie_device_put(pcie_device);

        _scsih_ublock_io_device(ioc, wwid);

        return;
}

/**
 * _scsih_pcie_add_device -  creating pcie device object
 * @ioc: per adapter object
 * @handle: pcie device handle
 *
 * Creating end device object, stored in ioc->pcie_device_list.
 *
 * Return: 1 means queue the event later, 0 means complete the event
 */
static int
_scsih_pcie_add_device(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        Mpi26PCIeDevicePage0_t pcie_device_pg0;
        Mpi26PCIeDevicePage2_t pcie_device_pg2;
        Mpi2ConfigReply_t mpi_reply;
        struct _pcie_device *pcie_device;
        struct _enclosure_node *enclosure_dev;
        u32 ioc_status;
        u64 wwid;

        if ((mpt3sas_config_get_pcie_device_pg0(ioc, &mpi_reply,
            &pcie_device_pg0, MPI26_PCIE_DEVICE_PGAD_FORM_HANDLE, handle))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return 0;
        }
        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT
                    "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return 0;
        }

        set_bit(handle, ioc->pend_os_device_add);
        wwid = le64_to_cpu(pcie_device_pg0.WWID);

        /* check if device is present */
        if (!(le32_to_cpu(pcie_device_pg0.Flags) &
                MPI26_PCIEDEV0_FLAGS_DEVICE_PRESENT)) {
                pr_err(MPT3SAS_FMT
                    "device is not present handle(0x04%x)!!!\n",
                    ioc->name, handle);
                return 0;
        }

        /* check if there were any issues with discovery */
        if (_scsih_check_pcie_access_status(ioc, wwid, handle,
            pcie_device_pg0.AccessStatus))
                return 0;

        if (!(_scsih_is_nvme_device(le32_to_cpu(pcie_device_pg0.DeviceInfo))))
                return 0;

        pcie_device = mpt3sas_get_pdev_by_wwid(ioc, wwid);
        if (pcie_device) {
                clear_bit(handle, ioc->pend_os_device_add);
                pcie_device_put(pcie_device);
                return 0;
        }

        pcie_device = kzalloc(sizeof(struct _pcie_device), GFP_KERNEL);
        if (!pcie_device) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                        ioc->name, __FILE__, __LINE__, __func__);
                return 0;
        }

        kref_init(&pcie_device->refcount);
        pcie_device->id = ioc->pcie_target_id++;
        pcie_device->channel = PCIE_CHANNEL;
        pcie_device->handle = handle;
        pcie_device->device_info = le32_to_cpu(pcie_device_pg0.DeviceInfo);
        pcie_device->wwid = wwid;
        pcie_device->port_num = pcie_device_pg0.PortNum;
        pcie_device->fast_path = (le32_to_cpu(pcie_device_pg0.Flags) &
            MPI26_PCIEDEV0_FLAGS_FAST_PATH_CAPABLE) ? 1 : 0;

        pcie_device->enclosure_handle =
            le16_to_cpu(pcie_device_pg0.EnclosureHandle);
        if (pcie_device->enclosure_handle != 0)
                pcie_device->slot = le16_to_cpu(pcie_device_pg0.Slot);

        if (le32_to_cpu(pcie_device_pg0.Flags) &
            MPI26_PCIEDEV0_FLAGS_ENCL_LEVEL_VALID) {
                pcie_device->enclosure_level = pcie_device_pg0.EnclosureLevel;
                memcpy(&pcie_device->connector_name[0],
                    &pcie_device_pg0.ConnectorName[0], 4);
        } else {
                pcie_device->enclosure_level = 0;
                pcie_device->connector_name[0] = '\0';
        }

        /* get enclosure_logical_id */
        if (pcie_device->enclosure_handle) {
                enclosure_dev =
                        mpt3sas_scsih_enclosure_find_by_handle(ioc,
                                                pcie_device->enclosure_handle);
                if (enclosure_dev)
                        pcie_device->enclosure_logical_id =
                            le64_to_cpu(enclosure_dev->pg0.EnclosureLogicalID);
        }
        /* TODO -- Add device name once FW supports it */
        if (mpt3sas_config_get_pcie_device_pg2(ioc, &mpi_reply,
                &pcie_device_pg2, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle)) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                                ioc->name, __FILE__, __LINE__, __func__);
                kfree(pcie_device);
                return 0;
        }

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                        ioc->name, __FILE__, __LINE__, __func__);
                kfree(pcie_device);
                return 0;
        }
        pcie_device->nvme_mdts =
                le32_to_cpu(pcie_device_pg2.MaximumDataTransferSize);
        if (pcie_device_pg2.ControllerResetTO)
                pcie_device->reset_timeout =
                        pcie_device_pg2.ControllerResetTO;
        else
                pcie_device->reset_timeout = 30;

        if (ioc->wait_for_discovery_to_complete)
                _scsih_pcie_device_init_add(ioc, pcie_device);
        else
                _scsih_pcie_device_add(ioc, pcie_device);

        pcie_device_put(pcie_device);
        return 0;
}

/**
 * _scsih_pcie_topology_change_event_debug - debug for topology
 * event
 * @ioc: per adapter object
 * @event_data: event data payload
 * Context: user.
 */
static void
_scsih_pcie_topology_change_event_debug(struct MPT3SAS_ADAPTER *ioc,
        Mpi26EventDataPCIeTopologyChangeList_t *event_data)
{
        int i;
        u16 handle;
        u16 reason_code;
        u8 port_number;
        char *status_str = NULL;
        u8 link_rate, prev_link_rate;

        switch (event_data->SwitchStatus) {
        case MPI26_EVENT_PCIE_TOPO_SS_ADDED:
                status_str = "add";
                break;
        case MPI26_EVENT_PCIE_TOPO_SS_NOT_RESPONDING:
                status_str = "remove";
                break;
        case MPI26_EVENT_PCIE_TOPO_SS_RESPONDING:
        case 0:
                status_str =  "responding";
                break;
        case MPI26_EVENT_PCIE_TOPO_SS_DELAY_NOT_RESPONDING:
                status_str = "remove delay";
                break;
        default:
                status_str = "unknown status";
                break;
        }
        pr_info(MPT3SAS_FMT "pcie topology change: (%s)\n",
                ioc->name, status_str);
        pr_info("\tswitch_handle(0x%04x), enclosure_handle(0x%04x)"
                "start_port(%02d), count(%d)\n",
                le16_to_cpu(event_data->SwitchDevHandle),
                le16_to_cpu(event_data->EnclosureHandle),
                event_data->StartPortNum, event_data->NumEntries);
        for (i = 0; i < event_data->NumEntries; i++) {
                handle =
                        le16_to_cpu(event_data->PortEntry[i].AttachedDevHandle);
                if (!handle)
                        continue;
                port_number = event_data->StartPortNum + i;
                reason_code = event_data->PortEntry[i].PortStatus;
                switch (reason_code) {
                case MPI26_EVENT_PCIE_TOPO_PS_DEV_ADDED:
                        status_str = "target add";
                        break;
                case MPI26_EVENT_PCIE_TOPO_PS_NOT_RESPONDING:
                        status_str = "target remove";
                        break;
                case MPI26_EVENT_PCIE_TOPO_PS_DELAY_NOT_RESPONDING:
                        status_str = "delay target remove";
                        break;
                case MPI26_EVENT_PCIE_TOPO_PS_PORT_CHANGED:
                        status_str = "link rate change";
                        break;
                case MPI26_EVENT_PCIE_TOPO_PS_NO_CHANGE:
                        status_str = "target responding";
                        break;
                default:
                        status_str = "unknown";
                        break;
                }
                link_rate = event_data->PortEntry[i].CurrentPortInfo &
                        MPI26_EVENT_PCIE_TOPO_PI_RATE_MASK;
                prev_link_rate = event_data->PortEntry[i].PreviousPortInfo &
                        MPI26_EVENT_PCIE_TOPO_PI_RATE_MASK;
                pr_info("\tport(%02d), attached_handle(0x%04x): %s:"
                        " link rate: new(0x%02x), old(0x%02x)\n", port_number,
                        handle, status_str, link_rate, prev_link_rate);
        }
}

/**
 * _scsih_pcie_topology_change_event - handle PCIe topology
 *  changes
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 *
 */
static void
_scsih_pcie_topology_change_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        int i;
        u16 handle;
        u16 reason_code;
        u8 link_rate, prev_link_rate;
        unsigned long flags;
        int rc;
        Mpi26EventDataPCIeTopologyChangeList_t *event_data =
                (Mpi26EventDataPCIeTopologyChangeList_t *) fw_event->event_data;
        struct _pcie_device *pcie_device;

        if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
                _scsih_pcie_topology_change_event_debug(ioc, event_data);

        if (ioc->shost_recovery || ioc->remove_host ||
                ioc->pci_error_recovery)
                return;

        if (fw_event->ignore) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT "ignoring switch event\n",
                        ioc->name));
                return;
        }

        /* handle siblings events */
        for (i = 0; i < event_data->NumEntries; i++) {
                if (fw_event->ignore) {
                        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                "ignoring switch event\n", ioc->name));
                        return;
                }
                if (ioc->remove_host || ioc->pci_error_recovery)
                        return;
                reason_code = event_data->PortEntry[i].PortStatus;
                handle =
                        le16_to_cpu(event_data->PortEntry[i].AttachedDevHandle);
                if (!handle)
                        continue;

                link_rate = event_data->PortEntry[i].CurrentPortInfo
                        & MPI26_EVENT_PCIE_TOPO_PI_RATE_MASK;
                prev_link_rate = event_data->PortEntry[i].PreviousPortInfo
                        & MPI26_EVENT_PCIE_TOPO_PI_RATE_MASK;

                switch (reason_code) {
                case MPI26_EVENT_PCIE_TOPO_PS_PORT_CHANGED:
                        if (ioc->shost_recovery)
                                break;
                        if (link_rate == prev_link_rate)
                                break;
                        if (link_rate < MPI26_EVENT_PCIE_TOPO_PI_RATE_2_5)
                                break;

                        _scsih_pcie_check_device(ioc, handle);

                        /* This code after this point handles the test case
                         * where a device has been added, however its returning
                         * BUSY for sometime.  Then before the Device Missing
                         * Delay expires and the device becomes READY, the
                         * device is removed and added back.
                         */
                        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
                        pcie_device = __mpt3sas_get_pdev_by_handle(ioc, handle);
                        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

                        if (pcie_device) {
                                pcie_device_put(pcie_device);
                                break;
                        }

                        if (!test_bit(handle, ioc->pend_os_device_add))
                                break;

                        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                "handle(0x%04x) device not found: convert "
                                "event to a device add\n", ioc->name, handle));
                        event_data->PortEntry[i].PortStatus &= 0xF0;
                        event_data->PortEntry[i].PortStatus |=
                                MPI26_EVENT_PCIE_TOPO_PS_DEV_ADDED;
                        /* fall through */
                case MPI26_EVENT_PCIE_TOPO_PS_DEV_ADDED:
                        if (ioc->shost_recovery)
                                break;
                        if (link_rate < MPI26_EVENT_PCIE_TOPO_PI_RATE_2_5)
                                break;

                        rc = _scsih_pcie_add_device(ioc, handle);
                        if (!rc) {
                                /* mark entry vacant */
                                /* TODO This needs to be reviewed and fixed,
                                 * we dont have an entry
                                 * to make an event void like vacant
                                 */
                                event_data->PortEntry[i].PortStatus |=
                                        MPI26_EVENT_PCIE_TOPO_PS_NO_CHANGE;
                        }
                        break;
                case MPI26_EVENT_PCIE_TOPO_PS_NOT_RESPONDING:
                        _scsih_pcie_device_remove_by_handle(ioc, handle);
                        break;
                }
        }
}

/**
 * _scsih_pcie_device_status_change_event_debug - debug for device event
 * @ioc: ?
 * @event_data: event data payload
 * Context: user.
 */
static void
_scsih_pcie_device_status_change_event_debug(struct MPT3SAS_ADAPTER *ioc,
        Mpi26EventDataPCIeDeviceStatusChange_t *event_data)
{
        char *reason_str = NULL;

        switch (event_data->ReasonCode) {
        case MPI26_EVENT_PCIDEV_STAT_RC_SMART_DATA:
                reason_str = "smart data";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_UNSUPPORTED:
                reason_str = "unsupported device discovered";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_INTERNAL_DEVICE_RESET:
                reason_str = "internal device reset";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_TASK_ABORT_INTERNAL:
                reason_str = "internal task abort";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_ABORT_TASK_SET_INTERNAL:
                reason_str = "internal task abort set";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_CLEAR_TASK_SET_INTERNAL:
                reason_str = "internal clear task set";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_QUERY_TASK_INTERNAL:
                reason_str = "internal query task";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_DEV_INIT_FAILURE:
                reason_str = "device init failure";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_CMP_INTERNAL_DEV_RESET:
                reason_str = "internal device reset complete";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_CMP_TASK_ABORT_INTERNAL:
                reason_str = "internal task abort complete";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_ASYNC_NOTIFICATION:
                reason_str = "internal async notification";
                break;
        case MPI26_EVENT_PCIDEV_STAT_RC_PCIE_HOT_RESET_FAILED:
                reason_str = "pcie hot reset failed";
                break;
        default:
                reason_str = "unknown reason";
                break;
        }

        pr_info(MPT3SAS_FMT "PCIE device status change: (%s)\n"
                "\thandle(0x%04x), WWID(0x%016llx), tag(%d)",
                ioc->name, reason_str, le16_to_cpu(event_data->DevHandle),
                (unsigned long long)le64_to_cpu(event_data->WWID),
                le16_to_cpu(event_data->TaskTag));
        if (event_data->ReasonCode == MPI26_EVENT_PCIDEV_STAT_RC_SMART_DATA)
                pr_info(MPT3SAS_FMT ", ASC(0x%x), ASCQ(0x%x)\n", ioc->name,
                        event_data->ASC, event_data->ASCQ);
        pr_info("\n");
}

/**
 * _scsih_pcie_device_status_change_event - handle device status
 * change
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_pcie_device_status_change_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        struct MPT3SAS_TARGET *target_priv_data;
        struct _pcie_device *pcie_device;
        u64 wwid;
        unsigned long flags;
        Mpi26EventDataPCIeDeviceStatusChange_t *event_data =
                (Mpi26EventDataPCIeDeviceStatusChange_t *)fw_event->event_data;
        if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
                _scsih_pcie_device_status_change_event_debug(ioc,
                        event_data);

        if (event_data->ReasonCode !=
                MPI26_EVENT_PCIDEV_STAT_RC_INTERNAL_DEVICE_RESET &&
                event_data->ReasonCode !=
                MPI26_EVENT_PCIDEV_STAT_RC_CMP_INTERNAL_DEV_RESET)
                return;

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        wwid = le64_to_cpu(event_data->WWID);
        pcie_device = __mpt3sas_get_pdev_by_wwid(ioc, wwid);

        if (!pcie_device || !pcie_device->starget)
                goto out;

        target_priv_data = pcie_device->starget->hostdata;
        if (!target_priv_data)
                goto out;

        if (event_data->ReasonCode ==
                MPI26_EVENT_PCIDEV_STAT_RC_INTERNAL_DEVICE_RESET)
                target_priv_data->tm_busy = 1;
        else
                target_priv_data->tm_busy = 0;
out:
        if (pcie_device)
                pcie_device_put(pcie_device);

        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
}

/**
 * _scsih_sas_enclosure_dev_status_change_event_debug - debug for enclosure
 * event
 * @ioc: per adapter object
 * @event_data: event data payload
 * Context: user.
 */
static void
_scsih_sas_enclosure_dev_status_change_event_debug(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataSasEnclDevStatusChange_t *event_data)
{
        char *reason_str = NULL;

        switch (event_data->ReasonCode) {
        case MPI2_EVENT_SAS_ENCL_RC_ADDED:
                reason_str = "enclosure add";
                break;
        case MPI2_EVENT_SAS_ENCL_RC_NOT_RESPONDING:
                reason_str = "enclosure remove";
                break;
        default:
                reason_str = "unknown reason";
                break;
        }

        pr_info(MPT3SAS_FMT "enclosure status change: (%s)\n"
            "\thandle(0x%04x), enclosure logical id(0x%016llx)"
            " number slots(%d)\n", ioc->name, reason_str,
            le16_to_cpu(event_data->EnclosureHandle),
            (unsigned long long)le64_to_cpu(event_data->EnclosureLogicalID),
            le16_to_cpu(event_data->StartSlot));
}

/**
 * _scsih_sas_enclosure_dev_status_change_event - handle enclosure events
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_sas_enclosure_dev_status_change_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        Mpi2ConfigReply_t mpi_reply;
        struct _enclosure_node *enclosure_dev = NULL;
        Mpi2EventDataSasEnclDevStatusChange_t *event_data =
                (Mpi2EventDataSasEnclDevStatusChange_t *)fw_event->event_data;
        int rc;
        u16 enclosure_handle = le16_to_cpu(event_data->EnclosureHandle);

        if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
                _scsih_sas_enclosure_dev_status_change_event_debug(ioc,
                     (Mpi2EventDataSasEnclDevStatusChange_t *)
                     fw_event->event_data);
        if (ioc->shost_recovery)
                return;

        if (enclosure_handle)
                enclosure_dev =
                        mpt3sas_scsih_enclosure_find_by_handle(ioc,
                                                enclosure_handle);
        switch (event_data->ReasonCode) {
        case MPI2_EVENT_SAS_ENCL_RC_ADDED:
                if (!enclosure_dev) {
                        enclosure_dev =
                                kzalloc(sizeof(struct _enclosure_node),
                                        GFP_KERNEL);
                        if (!enclosure_dev) {
                                pr_info(MPT3SAS_FMT
                                        "failure at %s:%d/%s()!\n", ioc->name,
                                        __FILE__, __LINE__, __func__);
                                return;
                        }
                        rc = mpt3sas_config_get_enclosure_pg0(ioc, &mpi_reply,
                                &enclosure_dev->pg0,
                                MPI2_SAS_ENCLOS_PGAD_FORM_HANDLE,
                                enclosure_handle);

                        if (rc || (le16_to_cpu(mpi_reply.IOCStatus) &
                                                MPI2_IOCSTATUS_MASK)) {
                                kfree(enclosure_dev);
                                return;
                        }

                        list_add_tail(&enclosure_dev->list,
                                                        &ioc->enclosure_list);
                }
                break;
        case MPI2_EVENT_SAS_ENCL_RC_NOT_RESPONDING:
                if (enclosure_dev) {
                        list_del(&enclosure_dev->list);
                        kfree(enclosure_dev);
                }
                break;
        default:
                break;
        }
}

/**
 * _scsih_sas_broadcast_primitive_event - handle broadcast events
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_sas_broadcast_primitive_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        struct scsi_cmnd *scmd;
        struct scsi_device *sdev;
        struct scsiio_tracker *st;
        u16 smid, handle;
        u32 lun;
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        u32 termination_count;
        u32 query_count;
        Mpi2SCSITaskManagementReply_t *mpi_reply;
        Mpi2EventDataSasBroadcastPrimitive_t *event_data =
                (Mpi2EventDataSasBroadcastPrimitive_t *)
                fw_event->event_data;
        u16 ioc_status;
        unsigned long flags;
        int r;
        u8 max_retries = 0;
        u8 task_abort_retries;

        mutex_lock(&ioc->tm_cmds.mutex);
        pr_info(MPT3SAS_FMT
                "%s: enter: phy number(%d), width(%d)\n",
                ioc->name, __func__, event_data->PhyNum,
             event_data->PortWidth);

        _scsih_block_io_all_device(ioc);

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        mpi_reply = ioc->tm_cmds.reply;
 broadcast_aen_retry:

        /* sanity checks for retrying this loop */
        if (max_retries++ == 5) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT "%s: giving up\n",
                    ioc->name, __func__));
                goto out;
        } else if (max_retries > 1)
                dewtprintk(ioc, pr_info(MPT3SAS_FMT "%s: %d retry\n",
                    ioc->name, __func__, max_retries - 1));

        termination_count = 0;
        query_count = 0;
        for (smid = 1; smid <= ioc->scsiio_depth; smid++) {
                if (ioc->shost_recovery)
                        goto out;
                scmd = mpt3sas_scsih_scsi_lookup_get(ioc, smid);
                if (!scmd)
                        continue;
                st = scsi_cmd_priv(scmd);
                sdev = scmd->device;
                sas_device_priv_data = sdev->hostdata;
                if (!sas_device_priv_data || !sas_device_priv_data->sas_target)
                        continue;
                 /* skip hidden raid components */
                if (sas_device_priv_data->sas_target->flags &
                    MPT_TARGET_FLAGS_RAID_COMPONENT)
                        continue;
                 /* skip volumes */
                if (sas_device_priv_data->sas_target->flags &
                    MPT_TARGET_FLAGS_VOLUME)
                        continue;
                 /* skip PCIe devices */
                if (sas_device_priv_data->sas_target->flags &
                    MPT_TARGET_FLAGS_PCIE_DEVICE)
                        continue;

                handle = sas_device_priv_data->sas_target->handle;
                lun = sas_device_priv_data->lun;
                query_count++;

                if (ioc->shost_recovery)
                        goto out;

                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
                r = mpt3sas_scsih_issue_tm(ioc, handle, lun,
                        MPI2_SCSITASKMGMT_TASKTYPE_QUERY_TASK, st->smid,
                        st->msix_io, 30, 0);
                if (r == FAILED) {
                        sdev_printk(KERN_WARNING, sdev,
                            "mpt3sas_scsih_issue_tm: FAILED when sending "
                            "QUERY_TASK: scmd(%p)\n", scmd);
                        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
                        goto broadcast_aen_retry;
                }
                ioc_status = le16_to_cpu(mpi_reply->IOCStatus)
                    & MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        sdev_printk(KERN_WARNING, sdev,
                                "query task: FAILED with IOCSTATUS(0x%04x), scmd(%p)\n",
                                ioc_status, scmd);
                        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
                        goto broadcast_aen_retry;
                }

                /* see if IO is still owned by IOC and target */
                if (mpi_reply->ResponseCode ==
                     MPI2_SCSITASKMGMT_RSP_TM_SUCCEEDED ||
                     mpi_reply->ResponseCode ==
                     MPI2_SCSITASKMGMT_RSP_IO_QUEUED_ON_IOC) {
                        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
                        continue;
                }
                task_abort_retries = 0;
 tm_retry:
                if (task_abort_retries++ == 60) {
                        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                            "%s: ABORT_TASK: giving up\n", ioc->name,
                            __func__));
                        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
                        goto broadcast_aen_retry;
                }

                if (ioc->shost_recovery)
                        goto out_no_lock;

                r = mpt3sas_scsih_issue_tm(ioc, handle, sdev->lun,
                        MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK, st->smid,
                        st->msix_io, 30, 0);
                if (r == FAILED || st->cb_idx != 0xFF) {
                        sdev_printk(KERN_WARNING, sdev,
                            "mpt3sas_scsih_issue_tm: ABORT_TASK: FAILED : "
                            "scmd(%p)\n", scmd);
                        goto tm_retry;
                }

                if (task_abort_retries > 1)
                        sdev_printk(KERN_WARNING, sdev,
                            "mpt3sas_scsih_issue_tm: ABORT_TASK: RETRIES (%d):"
                            " scmd(%p)\n",
                            task_abort_retries - 1, scmd);

                termination_count += le32_to_cpu(mpi_reply->TerminationCount);
                spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        }

        if (ioc->broadcast_aen_pending) {
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: loop back due to pending AEN\n",
                        ioc->name, __func__));
                 ioc->broadcast_aen_pending = 0;
                 goto broadcast_aen_retry;
        }

 out:
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
 out_no_lock:

        dewtprintk(ioc, pr_info(MPT3SAS_FMT
            "%s - exit, query_count = %d termination_count = %d\n",
            ioc->name, __func__, query_count, termination_count));

        ioc->broadcast_aen_busy = 0;
        if (!ioc->shost_recovery)
                _scsih_ublock_io_all_device(ioc);
        mutex_unlock(&ioc->tm_cmds.mutex);
}

/**
 * _scsih_sas_discovery_event - handle discovery events
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_sas_discovery_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        Mpi2EventDataSasDiscovery_t *event_data =
                (Mpi2EventDataSasDiscovery_t *) fw_event->event_data;

        if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK) {
                pr_info(MPT3SAS_FMT "discovery event: (%s)", ioc->name,
                    (event_data->ReasonCode == MPI2_EVENT_SAS_DISC_RC_STARTED) ?
                    "start" : "stop");
                if (event_data->DiscoveryStatus)
                        pr_info("discovery_status(0x%08x)",
                            le32_to_cpu(event_data->DiscoveryStatus));
                pr_info("\n");
        }

        if (event_data->ReasonCode == MPI2_EVENT_SAS_DISC_RC_STARTED &&
            !ioc->sas_hba.num_phys) {
                if (disable_discovery > 0 && ioc->shost_recovery) {
                        /* Wait for the reset to complete */
                        while (ioc->shost_recovery)
                                ssleep(1);
                }
                _scsih_sas_host_add(ioc);
        }
}

/**
 * _scsih_sas_device_discovery_error_event - display SAS device discovery error
 *                                              events
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_sas_device_discovery_error_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        Mpi25EventDataSasDeviceDiscoveryError_t *event_data =
                (Mpi25EventDataSasDeviceDiscoveryError_t *)fw_event->event_data;

        switch (event_data->ReasonCode) {
        case MPI25_EVENT_SAS_DISC_ERR_SMP_FAILED:
                pr_warn(MPT3SAS_FMT "SMP command sent to the expander"
                        "(handle:0x%04x, sas_address:0x%016llx,"
                        "physical_port:0x%02x) has failed",
                        ioc->name, le16_to_cpu(event_data->DevHandle),
                        (unsigned long long)le64_to_cpu(event_data->SASAddress),
                        event_data->PhysicalPort);
                break;
        case MPI25_EVENT_SAS_DISC_ERR_SMP_TIMEOUT:
                pr_warn(MPT3SAS_FMT "SMP command sent to the expander"
                        "(handle:0x%04x, sas_address:0x%016llx,"
                        "physical_port:0x%02x) has timed out",
                        ioc->name, le16_to_cpu(event_data->DevHandle),
                        (unsigned long long)le64_to_cpu(event_data->SASAddress),
                        event_data->PhysicalPort);
                break;
        default:
                break;
        }
}

/**
 * _scsih_pcie_enumeration_event - handle enumeration events
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_pcie_enumeration_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        Mpi26EventDataPCIeEnumeration_t *event_data =
                (Mpi26EventDataPCIeEnumeration_t *)fw_event->event_data;

        if (!(ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK))
                return;

        pr_info(MPT3SAS_FMT "pcie enumeration event: (%s) Flag 0x%02x",
                ioc->name,
                (event_data->ReasonCode == MPI26_EVENT_PCIE_ENUM_RC_STARTED) ?
                        "started" : "completed",
                event_data->Flags);
        if (event_data->EnumerationStatus)
                pr_cont("enumeration_status(0x%08x)",
                        le32_to_cpu(event_data->EnumerationStatus));
        pr_cont("\n");
}

/**
 * _scsih_ir_fastpath - turn on fastpath for IR physdisk
 * @ioc: per adapter object
 * @handle: device handle for physical disk
 * @phys_disk_num: physical disk number
 *
 * Return: 0 for success, else failure.
 */
static int
_scsih_ir_fastpath(struct MPT3SAS_ADAPTER *ioc, u16 handle, u8 phys_disk_num)
{
        Mpi2RaidActionRequest_t *mpi_request;
        Mpi2RaidActionReply_t *mpi_reply;
        u16 smid;
        u8 issue_reset = 0;
        int rc = 0;
        u16 ioc_status;
        u32 log_info;

        if (ioc->hba_mpi_version_belonged == MPI2_VERSION)
                return rc;

        mutex_lock(&ioc->scsih_cmds.mutex);

        if (ioc->scsih_cmds.status != MPT3_CMD_NOT_USED) {
                pr_err(MPT3SAS_FMT "%s: scsih_cmd in use\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }
        ioc->scsih_cmds.status = MPT3_CMD_PENDING;

        smid = mpt3sas_base_get_smid(ioc, ioc->scsih_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                ioc->scsih_cmds.status = MPT3_CMD_NOT_USED;
                rc = -EAGAIN;
                goto out;
        }

        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->scsih_cmds.smid = smid;
        memset(mpi_request, 0, sizeof(Mpi2RaidActionRequest_t));

        mpi_request->Function = MPI2_FUNCTION_RAID_ACTION;
        mpi_request->Action = MPI2_RAID_ACTION_PHYSDISK_HIDDEN;
        mpi_request->PhysDiskNum = phys_disk_num;

        dewtprintk(ioc, pr_info(MPT3SAS_FMT "IR RAID_ACTION: turning fast "\
            "path on for handle(0x%04x), phys_disk_num (0x%02x)\n", ioc->name,
            handle, phys_disk_num));

        init_completion(&ioc->scsih_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        wait_for_completion_timeout(&ioc->scsih_cmds.done, 10*HZ);

        if (!(ioc->scsih_cmds.status & MPT3_CMD_COMPLETE)) {
                issue_reset =
                        mpt3sas_base_check_cmd_timeout(ioc,
                                ioc->scsih_cmds.status, mpi_request,
                                sizeof(Mpi2RaidActionRequest_t)/4);
                rc = -EFAULT;
                goto out;
        }

        if (ioc->scsih_cmds.status & MPT3_CMD_REPLY_VALID) {

                mpi_reply = ioc->scsih_cmds.reply;
                ioc_status = le16_to_cpu(mpi_reply->IOCStatus);
                if (ioc_status & MPI2_IOCSTATUS_FLAG_LOG_INFO_AVAILABLE)
                        log_info =  le32_to_cpu(mpi_reply->IOCLogInfo);
                else
                        log_info = 0;
                ioc_status &= MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                            "IR RAID_ACTION: failed: ioc_status(0x%04x), "
                            "loginfo(0x%08x)!!!\n", ioc->name, ioc_status,
                            log_info));
                        rc = -EFAULT;
                } else
                        dewtprintk(ioc, pr_info(MPT3SAS_FMT
                            "IR RAID_ACTION: completed successfully\n",
                            ioc->name));
        }

 out:
        ioc->scsih_cmds.status = MPT3_CMD_NOT_USED;
        mutex_unlock(&ioc->scsih_cmds.mutex);

        if (issue_reset)
                mpt3sas_base_hard_reset_handler(ioc, FORCE_BIG_HAMMER);
        return rc;
}

/**
 * _scsih_reprobe_lun - reprobing lun
 * @sdev: scsi device struct
 * @no_uld_attach: sdev->no_uld_attach flag setting
 *
 **/
static void
_scsih_reprobe_lun(struct scsi_device *sdev, void *no_uld_attach)
{
        sdev->no_uld_attach = no_uld_attach ? 1 : 0;
        sdev_printk(KERN_INFO, sdev, "%s raid component\n",
            sdev->no_uld_attach ? "hiding" : "exposing");
        WARN_ON(scsi_device_reprobe(sdev));
}

/**
 * _scsih_sas_volume_add - add new volume
 * @ioc: per adapter object
 * @element: IR config element data
 * Context: user.
 */
static void
_scsih_sas_volume_add(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventIrConfigElement_t *element)
{
        struct _raid_device *raid_device;
        unsigned long flags;
        u64 wwid;
        u16 handle = le16_to_cpu(element->VolDevHandle);
        int rc;

        mpt3sas_config_get_volume_wwid(ioc, handle, &wwid);
        if (!wwid) {
                pr_err(MPT3SAS_FMT
                    "failure at %s:%d/%s()!\n", ioc->name,
                    __FILE__, __LINE__, __func__);
                return;
        }

        spin_lock_irqsave(&ioc->raid_device_lock, flags);
        raid_device = _scsih_raid_device_find_by_wwid(ioc, wwid);
        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);

        if (raid_device)
                return;

        raid_device = kzalloc(sizeof(struct _raid_device), GFP_KERNEL);
        if (!raid_device) {
                pr_err(MPT3SAS_FMT
                    "failure at %s:%d/%s()!\n", ioc->name,
                    __FILE__, __LINE__, __func__);
                return;
        }

        raid_device->id = ioc->sas_id++;
        raid_device->channel = RAID_CHANNEL;
        raid_device->handle = handle;
        raid_device->wwid = wwid;
        _scsih_raid_device_add(ioc, raid_device);
        if (!ioc->wait_for_discovery_to_complete) {
                rc = scsi_add_device(ioc->shost, RAID_CHANNEL,
                    raid_device->id, 0);
                if (rc)
                        _scsih_raid_device_remove(ioc, raid_device);
        } else {
                spin_lock_irqsave(&ioc->raid_device_lock, flags);
                _scsih_determine_boot_device(ioc, raid_device, 1);
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
        }
}

/**
 * _scsih_sas_volume_delete - delete volume
 * @ioc: per adapter object
 * @handle: volume device handle
 * Context: user.
 */
static void
_scsih_sas_volume_delete(struct MPT3SAS_ADAPTER *ioc, u16 handle)
{
        struct _raid_device *raid_device;
        unsigned long flags;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        struct scsi_target *starget = NULL;

        spin_lock_irqsave(&ioc->raid_device_lock, flags);
        raid_device = mpt3sas_raid_device_find_by_handle(ioc, handle);
        if (raid_device) {
                if (raid_device->starget) {
                        starget = raid_device->starget;
                        sas_target_priv_data = starget->hostdata;
                        sas_target_priv_data->deleted = 1;
                }
                pr_info(MPT3SAS_FMT "removing handle(0x%04x), wwid(0x%016llx)\n",
                        ioc->name,  raid_device->handle,
                    (unsigned long long) raid_device->wwid);
                list_del(&raid_device->list);
                kfree(raid_device);
        }
        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
        if (starget)
                scsi_remove_target(&starget->dev);
}

/**
 * _scsih_sas_pd_expose - expose pd component to /dev/sdX
 * @ioc: per adapter object
 * @element: IR config element data
 * Context: user.
 */
static void
_scsih_sas_pd_expose(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventIrConfigElement_t *element)
{
        struct _sas_device *sas_device;
        struct scsi_target *starget = NULL;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        unsigned long flags;
        u16 handle = le16_to_cpu(element->PhysDiskDevHandle);

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_by_handle(ioc, handle);
        if (sas_device) {
                sas_device->volume_handle = 0;
                sas_device->volume_wwid = 0;
                clear_bit(handle, ioc->pd_handles);
                if (sas_device->starget && sas_device->starget->hostdata) {
                        starget = sas_device->starget;
                        sas_target_priv_data = starget->hostdata;
                        sas_target_priv_data->flags &=
                            ~MPT_TARGET_FLAGS_RAID_COMPONENT;
                }
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        if (!sas_device)
                return;

        /* exposing raid component */
        if (starget)
                starget_for_each_device(starget, NULL, _scsih_reprobe_lun);

        sas_device_put(sas_device);
}

/**
 * _scsih_sas_pd_hide - hide pd component from /dev/sdX
 * @ioc: per adapter object
 * @element: IR config element data
 * Context: user.
 */
static void
_scsih_sas_pd_hide(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventIrConfigElement_t *element)
{
        struct _sas_device *sas_device;
        struct scsi_target *starget = NULL;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        unsigned long flags;
        u16 handle = le16_to_cpu(element->PhysDiskDevHandle);
        u16 volume_handle = 0;
        u64 volume_wwid = 0;

        mpt3sas_config_get_volume_handle(ioc, handle, &volume_handle);
        if (volume_handle)
                mpt3sas_config_get_volume_wwid(ioc, volume_handle,
                    &volume_wwid);

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = __mpt3sas_get_sdev_by_handle(ioc, handle);
        if (sas_device) {
                set_bit(handle, ioc->pd_handles);
                if (sas_device->starget && sas_device->starget->hostdata) {
                        starget = sas_device->starget;
                        sas_target_priv_data = starget->hostdata;
                        sas_target_priv_data->flags |=
                            MPT_TARGET_FLAGS_RAID_COMPONENT;
                        sas_device->volume_handle = volume_handle;
                        sas_device->volume_wwid = volume_wwid;
                }
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        if (!sas_device)
                return;

        /* hiding raid component */
        _scsih_ir_fastpath(ioc, handle, element->PhysDiskNum);

        if (starget)
                starget_for_each_device(starget, (void *)1, _scsih_reprobe_lun);

        sas_device_put(sas_device);
}

/**
 * _scsih_sas_pd_delete - delete pd component
 * @ioc: per adapter object
 * @element: IR config element data
 * Context: user.
 */
static void
_scsih_sas_pd_delete(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventIrConfigElement_t *element)
{
        u16 handle = le16_to_cpu(element->PhysDiskDevHandle);

        _scsih_device_remove_by_handle(ioc, handle);
}

/**
 * _scsih_sas_pd_add - remove pd component
 * @ioc: per adapter object
 * @element: IR config element data
 * Context: user.
 */
static void
_scsih_sas_pd_add(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventIrConfigElement_t *element)
{
        struct _sas_device *sas_device;
        u16 handle = le16_to_cpu(element->PhysDiskDevHandle);
        Mpi2ConfigReply_t mpi_reply;
        Mpi2SasDevicePage0_t sas_device_pg0;
        u32 ioc_status;
        u64 sas_address;
        u16 parent_handle;

        set_bit(handle, ioc->pd_handles);

        sas_device = mpt3sas_get_sdev_by_handle(ioc, handle);
        if (sas_device) {
                _scsih_ir_fastpath(ioc, handle, element->PhysDiskNum);
                sas_device_put(sas_device);
                return;
        }

        if ((mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
            MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return;
        }

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return;
        }

        parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
        if (!_scsih_get_sas_address(ioc, parent_handle, &sas_address))
                mpt3sas_transport_update_links(ioc, sas_address, handle,
                    sas_device_pg0.PhyNum, MPI2_SAS_NEG_LINK_RATE_1_5);

        _scsih_ir_fastpath(ioc, handle, element->PhysDiskNum);
        _scsih_add_device(ioc, handle, 0, 1);
}

/**
 * _scsih_sas_ir_config_change_event_debug - debug for IR Config Change events
 * @ioc: per adapter object
 * @event_data: event data payload
 * Context: user.
 */
static void
_scsih_sas_ir_config_change_event_debug(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataIrConfigChangeList_t *event_data)
{
        Mpi2EventIrConfigElement_t *element;
        u8 element_type;
        int i;
        char *reason_str = NULL, *element_str = NULL;

        element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];

        pr_info(MPT3SAS_FMT "raid config change: (%s), elements(%d)\n",
            ioc->name, (le32_to_cpu(event_data->Flags) &
            MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG) ?
            "foreign" : "native", event_data->NumElements);
        for (i = 0; i < event_data->NumElements; i++, element++) {
                switch (element->ReasonCode) {
                case MPI2_EVENT_IR_CHANGE_RC_ADDED:
                        reason_str = "add";
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_REMOVED:
                        reason_str = "remove";
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_NO_CHANGE:
                        reason_str = "no change";
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_HIDE:
                        reason_str = "hide";
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_UNHIDE:
                        reason_str = "unhide";
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_VOLUME_CREATED:
                        reason_str = "volume_created";
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED:
                        reason_str = "volume_deleted";
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_PD_CREATED:
                        reason_str = "pd_created";
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_PD_DELETED:
                        reason_str = "pd_deleted";
                        break;
                default:
                        reason_str = "unknown reason";
                        break;
                }
                element_type = le16_to_cpu(element->ElementFlags) &
                    MPI2_EVENT_IR_CHANGE_EFLAGS_ELEMENT_TYPE_MASK;
                switch (element_type) {
                case MPI2_EVENT_IR_CHANGE_EFLAGS_VOLUME_ELEMENT:
                        element_str = "volume";
                        break;
                case MPI2_EVENT_IR_CHANGE_EFLAGS_VOLPHYSDISK_ELEMENT:
                        element_str = "phys disk";
                        break;
                case MPI2_EVENT_IR_CHANGE_EFLAGS_HOTSPARE_ELEMENT:
                        element_str = "hot spare";
                        break;
                default:
                        element_str = "unknown element";
                        break;
                }
                pr_info("\t(%s:%s), vol handle(0x%04x), " \
                    "pd handle(0x%04x), pd num(0x%02x)\n", element_str,
                    reason_str, le16_to_cpu(element->VolDevHandle),
                    le16_to_cpu(element->PhysDiskDevHandle),
                    element->PhysDiskNum);
        }
}

/**
 * _scsih_sas_ir_config_change_event - handle ir configuration change events
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_sas_ir_config_change_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        Mpi2EventIrConfigElement_t *element;
        int i;
        u8 foreign_config;
        Mpi2EventDataIrConfigChangeList_t *event_data =
                (Mpi2EventDataIrConfigChangeList_t *)
                fw_event->event_data;

        if ((ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK) &&
             (!ioc->hide_ir_msg))
                _scsih_sas_ir_config_change_event_debug(ioc, event_data);

        foreign_config = (le32_to_cpu(event_data->Flags) &
            MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG) ? 1 : 0;

        element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
        if (ioc->shost_recovery &&
            ioc->hba_mpi_version_belonged != MPI2_VERSION) {
                for (i = 0; i < event_data->NumElements; i++, element++) {
                        if (element->ReasonCode == MPI2_EVENT_IR_CHANGE_RC_HIDE)
                                _scsih_ir_fastpath(ioc,
                                        le16_to_cpu(element->PhysDiskDevHandle),
                                        element->PhysDiskNum);
                }
                return;
        }

        for (i = 0; i < event_data->NumElements; i++, element++) {

                switch (element->ReasonCode) {
                case MPI2_EVENT_IR_CHANGE_RC_VOLUME_CREATED:
                case MPI2_EVENT_IR_CHANGE_RC_ADDED:
                        if (!foreign_config)
                                _scsih_sas_volume_add(ioc, element);
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED:
                case MPI2_EVENT_IR_CHANGE_RC_REMOVED:
                        if (!foreign_config)
                                _scsih_sas_volume_delete(ioc,
                                    le16_to_cpu(element->VolDevHandle));
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_PD_CREATED:
                        if (!ioc->is_warpdrive)
                                _scsih_sas_pd_hide(ioc, element);
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_PD_DELETED:
                        if (!ioc->is_warpdrive)
                                _scsih_sas_pd_expose(ioc, element);
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_HIDE:
                        if (!ioc->is_warpdrive)
                                _scsih_sas_pd_add(ioc, element);
                        break;
                case MPI2_EVENT_IR_CHANGE_RC_UNHIDE:
                        if (!ioc->is_warpdrive)
                                _scsih_sas_pd_delete(ioc, element);
                        break;
                }
        }
}

/**
 * _scsih_sas_ir_volume_event - IR volume event
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_sas_ir_volume_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        u64 wwid;
        unsigned long flags;
        struct _raid_device *raid_device;
        u16 handle;
        u32 state;
        int rc;
        Mpi2EventDataIrVolume_t *event_data =
                (Mpi2EventDataIrVolume_t *) fw_event->event_data;

        if (ioc->shost_recovery)
                return;

        if (event_data->ReasonCode != MPI2_EVENT_IR_VOLUME_RC_STATE_CHANGED)
                return;

        handle = le16_to_cpu(event_data->VolDevHandle);
        state = le32_to_cpu(event_data->NewValue);
        if (!ioc->hide_ir_msg)
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "%s: handle(0x%04x), old(0x%08x), new(0x%08x)\n",
                    ioc->name, __func__,  handle,
                    le32_to_cpu(event_data->PreviousValue), state));
        switch (state) {
        case MPI2_RAID_VOL_STATE_MISSING:
        case MPI2_RAID_VOL_STATE_FAILED:
                _scsih_sas_volume_delete(ioc, handle);
                break;

        case MPI2_RAID_VOL_STATE_ONLINE:
        case MPI2_RAID_VOL_STATE_DEGRADED:
        case MPI2_RAID_VOL_STATE_OPTIMAL:

                spin_lock_irqsave(&ioc->raid_device_lock, flags);
                raid_device = mpt3sas_raid_device_find_by_handle(ioc, handle);
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);

                if (raid_device)
                        break;

                mpt3sas_config_get_volume_wwid(ioc, handle, &wwid);
                if (!wwid) {
                        pr_err(MPT3SAS_FMT
                            "failure at %s:%d/%s()!\n", ioc->name,
                            __FILE__, __LINE__, __func__);
                        break;
                }

                raid_device = kzalloc(sizeof(struct _raid_device), GFP_KERNEL);
                if (!raid_device) {
                        pr_err(MPT3SAS_FMT
                            "failure at %s:%d/%s()!\n", ioc->name,
                            __FILE__, __LINE__, __func__);
                        break;
                }

                raid_device->id = ioc->sas_id++;
                raid_device->channel = RAID_CHANNEL;
                raid_device->handle = handle;
                raid_device->wwid = wwid;
                _scsih_raid_device_add(ioc, raid_device);
                rc = scsi_add_device(ioc->shost, RAID_CHANNEL,
                    raid_device->id, 0);
                if (rc)
                        _scsih_raid_device_remove(ioc, raid_device);
                break;

        case MPI2_RAID_VOL_STATE_INITIALIZING:
        default:
                break;
        }
}

/**
 * _scsih_sas_ir_physical_disk_event - PD event
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_sas_ir_physical_disk_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        u16 handle, parent_handle;
        u32 state;
        struct _sas_device *sas_device;
        Mpi2ConfigReply_t mpi_reply;
        Mpi2SasDevicePage0_t sas_device_pg0;
        u32 ioc_status;
        Mpi2EventDataIrPhysicalDisk_t *event_data =
                (Mpi2EventDataIrPhysicalDisk_t *) fw_event->event_data;
        u64 sas_address;

        if (ioc->shost_recovery)
                return;

        if (event_data->ReasonCode != MPI2_EVENT_IR_PHYSDISK_RC_STATE_CHANGED)
                return;

        handle = le16_to_cpu(event_data->PhysDiskDevHandle);
        state = le32_to_cpu(event_data->NewValue);

        if (!ioc->hide_ir_msg)
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                    "%s: handle(0x%04x), old(0x%08x), new(0x%08x)\n",
                    ioc->name, __func__,  handle,
                    le32_to_cpu(event_data->PreviousValue), state));

        switch (state) {
        case MPI2_RAID_PD_STATE_ONLINE:
        case MPI2_RAID_PD_STATE_DEGRADED:
        case MPI2_RAID_PD_STATE_REBUILDING:
        case MPI2_RAID_PD_STATE_OPTIMAL:
        case MPI2_RAID_PD_STATE_HOT_SPARE:

                if (!ioc->is_warpdrive)
                        set_bit(handle, ioc->pd_handles);

                sas_device = mpt3sas_get_sdev_by_handle(ioc, handle);
                if (sas_device) {
                        sas_device_put(sas_device);
                        return;
                }

                if ((mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply,
                    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
                    handle))) {
                        pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                            ioc->name, __FILE__, __LINE__, __func__);
                        return;
                }

                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                            ioc->name, __FILE__, __LINE__, __func__);
                        return;
                }

                parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
                if (!_scsih_get_sas_address(ioc, parent_handle, &sas_address))
                        mpt3sas_transport_update_links(ioc, sas_address, handle,
                            sas_device_pg0.PhyNum, MPI2_SAS_NEG_LINK_RATE_1_5);

                _scsih_add_device(ioc, handle, 0, 1);

                break;

        case MPI2_RAID_PD_STATE_OFFLINE:
        case MPI2_RAID_PD_STATE_NOT_CONFIGURED:
        case MPI2_RAID_PD_STATE_NOT_COMPATIBLE:
        default:
                break;
        }
}

/**
 * _scsih_sas_ir_operation_status_event_debug - debug for IR op event
 * @ioc: per adapter object
 * @event_data: event data payload
 * Context: user.
 */
static void
_scsih_sas_ir_operation_status_event_debug(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventDataIrOperationStatus_t *event_data)
{
        char *reason_str = NULL;

        switch (event_data->RAIDOperation) {
        case MPI2_EVENT_IR_RAIDOP_RESYNC:
                reason_str = "resync";
                break;
        case MPI2_EVENT_IR_RAIDOP_ONLINE_CAP_EXPANSION:
                reason_str = "online capacity expansion";
                break;
        case MPI2_EVENT_IR_RAIDOP_CONSISTENCY_CHECK:
                reason_str = "consistency check";
                break;
        case MPI2_EVENT_IR_RAIDOP_BACKGROUND_INIT:
                reason_str = "background init";
                break;
        case MPI2_EVENT_IR_RAIDOP_MAKE_DATA_CONSISTENT:
                reason_str = "make data consistent";
                break;
        }

        if (!reason_str)
                return;

        pr_info(MPT3SAS_FMT "raid operational status: (%s)" \
            "\thandle(0x%04x), percent complete(%d)\n",
            ioc->name, reason_str,
            le16_to_cpu(event_data->VolDevHandle),
            event_data->PercentComplete);
}

/**
 * _scsih_sas_ir_operation_status_event - handle RAID operation events
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_scsih_sas_ir_operation_status_event(struct MPT3SAS_ADAPTER *ioc,
        struct fw_event_work *fw_event)
{
        Mpi2EventDataIrOperationStatus_t *event_data =
                (Mpi2EventDataIrOperationStatus_t *)
                fw_event->event_data;
        static struct _raid_device *raid_device;
        unsigned long flags;
        u16 handle;

        if ((ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK) &&
            (!ioc->hide_ir_msg))
                _scsih_sas_ir_operation_status_event_debug(ioc,
                     event_data);

        /* code added for raid transport support */
        if (event_data->RAIDOperation == MPI2_EVENT_IR_RAIDOP_RESYNC) {

                spin_lock_irqsave(&ioc->raid_device_lock, flags);
                handle = le16_to_cpu(event_data->VolDevHandle);
                raid_device = mpt3sas_raid_device_find_by_handle(ioc, handle);
                if (raid_device)
                        raid_device->percent_complete =
                            event_data->PercentComplete;
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
        }
}

/**
 * _scsih_prep_device_scan - initialize parameters prior to device scan
 * @ioc: per adapter object
 *
 * Set the deleted flag prior to device scan.  If the device is found during
 * the scan, then we clear the deleted flag.
 */
static void
_scsih_prep_device_scan(struct MPT3SAS_ADAPTER *ioc)
{
        struct MPT3SAS_DEVICE *sas_device_priv_data;
        struct scsi_device *sdev;

        shost_for_each_device(sdev, ioc->shost) {
                sas_device_priv_data = sdev->hostdata;
                if (sas_device_priv_data && sas_device_priv_data->sas_target)
                        sas_device_priv_data->sas_target->deleted = 1;
        }
}

/**
 * _scsih_mark_responding_sas_device - mark a sas_devices as responding
 * @ioc: per adapter object
 * @sas_device_pg0: SAS Device page 0
 *
 * After host reset, find out whether devices are still responding.
 * Used in _scsih_remove_unresponsive_sas_devices.
 */
static void
_scsih_mark_responding_sas_device(struct MPT3SAS_ADAPTER *ioc,
Mpi2SasDevicePage0_t *sas_device_pg0)
{
        struct MPT3SAS_TARGET *sas_target_priv_data = NULL;
        struct scsi_target *starget;
        struct _sas_device *sas_device = NULL;
        struct _enclosure_node *enclosure_dev = NULL;
        unsigned long flags;

        if (sas_device_pg0->EnclosureHandle) {
                enclosure_dev =
                        mpt3sas_scsih_enclosure_find_by_handle(ioc,
                                le16_to_cpu(sas_device_pg0->EnclosureHandle));
                if (enclosure_dev == NULL)
                        pr_info(MPT3SAS_FMT "Enclosure handle(0x%04x)"
                            "doesn't match with enclosure device!\n",
                            ioc->name, sas_device_pg0->EnclosureHandle);
        }
        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        list_for_each_entry(sas_device, &ioc->sas_device_list, list) {
                if ((sas_device->sas_address == le64_to_cpu(
                    sas_device_pg0->SASAddress)) && (sas_device->slot ==
                    le16_to_cpu(sas_device_pg0->Slot))) {
                        sas_device->responding = 1;
                        starget = sas_device->starget;
                        if (starget && starget->hostdata) {
                                sas_target_priv_data = starget->hostdata;
                                sas_target_priv_data->tm_busy = 0;
                                sas_target_priv_data->deleted = 0;
                        } else
                                sas_target_priv_data = NULL;
                        if (starget) {
                                starget_printk(KERN_INFO, starget,
                                    "handle(0x%04x), sas_addr(0x%016llx)\n",
                                    le16_to_cpu(sas_device_pg0->DevHandle),
                                    (unsigned long long)
                                    sas_device->sas_address);

                                if (sas_device->enclosure_handle != 0)
                                        starget_printk(KERN_INFO, starget,
                                         "enclosure logical id(0x%016llx),"
                                         " slot(%d)\n",
                                         (unsigned long long)
                                         sas_device->enclosure_logical_id,
                                         sas_device->slot);
                        }
                        if (le16_to_cpu(sas_device_pg0->Flags) &
                              MPI2_SAS_DEVICE0_FLAGS_ENCL_LEVEL_VALID) {
                                sas_device->enclosure_level =
                                   sas_device_pg0->EnclosureLevel;
                                memcpy(&sas_device->connector_name[0],
                                        &sas_device_pg0->ConnectorName[0], 4);
                        } else {
                                sas_device->enclosure_level = 0;
                                sas_device->connector_name[0] = '\0';
                        }

                        sas_device->enclosure_handle =
                                le16_to_cpu(sas_device_pg0->EnclosureHandle);
                        sas_device->is_chassis_slot_valid = 0;
                        if (enclosure_dev) {
                                sas_device->enclosure_logical_id = le64_to_cpu(
                                        enclosure_dev->pg0.EnclosureLogicalID);
                                if (le16_to_cpu(enclosure_dev->pg0.Flags) &
                                    MPI2_SAS_ENCLS0_FLAGS_CHASSIS_SLOT_VALID) {
                                        sas_device->is_chassis_slot_valid = 1;
                                        sas_device->chassis_slot =
                                                enclosure_dev->pg0.ChassisSlot;
                                }
                        }

                        if (sas_device->handle == le16_to_cpu(
                            sas_device_pg0->DevHandle))
                                goto out;
                        pr_info("\thandle changed from(0x%04x)!!!\n",
                            sas_device->handle);
                        sas_device->handle = le16_to_cpu(
                            sas_device_pg0->DevHandle);
                        if (sas_target_priv_data)
                                sas_target_priv_data->handle =
                                    le16_to_cpu(sas_device_pg0->DevHandle);
                        goto out;
                }
        }
 out:
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
}

/**
 * _scsih_create_enclosure_list_after_reset - Free Existing list,
 *      And create enclosure list by scanning all Enclosure Page(0)s
 * @ioc: per adapter object
 */
static void
_scsih_create_enclosure_list_after_reset(struct MPT3SAS_ADAPTER *ioc)
{
        struct _enclosure_node *enclosure_dev;
        Mpi2ConfigReply_t mpi_reply;
        u16 enclosure_handle;
        int rc;

        /* Free existing enclosure list */
        mpt3sas_free_enclosure_list(ioc);

        /* Re constructing enclosure list after reset*/
        enclosure_handle = 0xFFFF;
        do {
                enclosure_dev =
                        kzalloc(sizeof(struct _enclosure_node), GFP_KERNEL);
                if (!enclosure_dev) {
                        pr_err(MPT3SAS_FMT
                                "failure at %s:%d/%s()!\n", ioc->name,
                                __FILE__, __LINE__, __func__);
                        return;
                }
                rc = mpt3sas_config_get_enclosure_pg0(ioc, &mpi_reply,
                                &enclosure_dev->pg0,
                                MPI2_SAS_ENCLOS_PGAD_FORM_GET_NEXT_HANDLE,
                                enclosure_handle);

                if (rc || (le16_to_cpu(mpi_reply.IOCStatus) &
                                                MPI2_IOCSTATUS_MASK)) {
                        kfree(enclosure_dev);
                        return;
                }
                list_add_tail(&enclosure_dev->list,
                                                &ioc->enclosure_list);
                enclosure_handle =
                        le16_to_cpu(enclosure_dev->pg0.EnclosureHandle);
        } while (1);
}

/**
 * _scsih_search_responding_sas_devices -
 * @ioc: per adapter object
 *
 * After host reset, find out whether devices are still responding.
 * If not remove.
 */
static void
_scsih_search_responding_sas_devices(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2SasDevicePage0_t sas_device_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u16 ioc_status;
        u16 handle;
        u32 device_info;

        pr_info(MPT3SAS_FMT "search for end-devices: start\n", ioc->name);

        if (list_empty(&ioc->sas_device_list))
                goto out;

        handle = 0xFFFF;
        while (!(mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply,
            &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_GET_NEXT_HANDLE,
            handle))) {
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
                        break;
                handle = le16_to_cpu(sas_device_pg0.DevHandle);
                device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);
                if (!(_scsih_is_end_device(device_info)))
                        continue;
                _scsih_mark_responding_sas_device(ioc, &sas_device_pg0);
        }

 out:
        pr_info(MPT3SAS_FMT "search for end-devices: complete\n",
            ioc->name);
}

/**
 * _scsih_mark_responding_pcie_device - mark a pcie_device as responding
 * @ioc: per adapter object
 * @pcie_device_pg0: PCIe Device page 0
 *
 * After host reset, find out whether devices are still responding.
 * Used in _scsih_remove_unresponding_devices.
 */
static void
_scsih_mark_responding_pcie_device(struct MPT3SAS_ADAPTER *ioc,
        Mpi26PCIeDevicePage0_t *pcie_device_pg0)
{
        struct MPT3SAS_TARGET *sas_target_priv_data = NULL;
        struct scsi_target *starget;
        struct _pcie_device *pcie_device;
        unsigned long flags;

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        list_for_each_entry(pcie_device, &ioc->pcie_device_list, list) {
                if ((pcie_device->wwid == le64_to_cpu(pcie_device_pg0->WWID))
                    && (pcie_device->slot == le16_to_cpu(
                    pcie_device_pg0->Slot))) {
                        pcie_device->responding = 1;
                        starget = pcie_device->starget;
                        if (starget && starget->hostdata) {
                                sas_target_priv_data = starget->hostdata;
                                sas_target_priv_data->tm_busy = 0;
                                sas_target_priv_data->deleted = 0;
                        } else
                                sas_target_priv_data = NULL;
                        if (starget) {
                                starget_printk(KERN_INFO, starget,
                                    "handle(0x%04x), wwid(0x%016llx) ",
                                    pcie_device->handle,
                                    (unsigned long long)pcie_device->wwid);
                                if (pcie_device->enclosure_handle != 0)
                                        starget_printk(KERN_INFO, starget,
                                            "enclosure logical id(0x%016llx), "
                                            "slot(%d)\n",
                                            (unsigned long long)
                                            pcie_device->enclosure_logical_id,
                                            pcie_device->slot);
                        }

                        if (((le32_to_cpu(pcie_device_pg0->Flags)) &
                            MPI26_PCIEDEV0_FLAGS_ENCL_LEVEL_VALID) &&
                            (ioc->hba_mpi_version_belonged != MPI2_VERSION)) {
                                pcie_device->enclosure_level =
                                    pcie_device_pg0->EnclosureLevel;
                                memcpy(&pcie_device->connector_name[0],
                                    &pcie_device_pg0->ConnectorName[0], 4);
                        } else {
                                pcie_device->enclosure_level = 0;
                                pcie_device->connector_name[0] = '\0';
                        }

                        if (pcie_device->handle == le16_to_cpu(
                            pcie_device_pg0->DevHandle))
                                goto out;
                        pr_info("\thandle changed from(0x%04x)!!!\n",
                            pcie_device->handle);
                        pcie_device->handle = le16_to_cpu(
                            pcie_device_pg0->DevHandle);
                        if (sas_target_priv_data)
                                sas_target_priv_data->handle =
                                    le16_to_cpu(pcie_device_pg0->DevHandle);
                        goto out;
                }
        }

 out:
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
}

/**
 * _scsih_search_responding_pcie_devices -
 * @ioc: per adapter object
 *
 * After host reset, find out whether devices are still responding.
 * If not remove.
 */
static void
_scsih_search_responding_pcie_devices(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi26PCIeDevicePage0_t pcie_device_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u16 ioc_status;
        u16 handle;
        u32 device_info;

        pr_info(MPT3SAS_FMT "search for end-devices: start\n", ioc->name);

        if (list_empty(&ioc->pcie_device_list))
                goto out;

        handle = 0xFFFF;
        while (!(mpt3sas_config_get_pcie_device_pg0(ioc, &mpi_reply,
                &pcie_device_pg0, MPI26_PCIE_DEVICE_PGAD_FORM_GET_NEXT_HANDLE,
                handle))) {
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_info(MPT3SAS_FMT "\tbreak from %s: "
                            "ioc_status(0x%04x), loginfo(0x%08x)\n", ioc->name,
                            __func__, ioc_status,
                            le32_to_cpu(mpi_reply.IOCLogInfo));
                        break;
                }
                handle = le16_to_cpu(pcie_device_pg0.DevHandle);
                device_info = le32_to_cpu(pcie_device_pg0.DeviceInfo);
                if (!(_scsih_is_nvme_device(device_info)))
                        continue;
                _scsih_mark_responding_pcie_device(ioc, &pcie_device_pg0);
        }
out:
        pr_info(MPT3SAS_FMT "search for PCIe end-devices: complete\n",
            ioc->name);
}

/**
 * _scsih_mark_responding_raid_device - mark a raid_device as responding
 * @ioc: per adapter object
 * @wwid: world wide identifier for raid volume
 * @handle: device handle
 *
 * After host reset, find out whether devices are still responding.
 * Used in _scsih_remove_unresponsive_raid_devices.
 */
static void
_scsih_mark_responding_raid_device(struct MPT3SAS_ADAPTER *ioc, u64 wwid,
        u16 handle)
{
        struct MPT3SAS_TARGET *sas_target_priv_data = NULL;
        struct scsi_target *starget;
        struct _raid_device *raid_device;
        unsigned long flags;

        spin_lock_irqsave(&ioc->raid_device_lock, flags);
        list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
                if (raid_device->wwid == wwid && raid_device->starget) {
                        starget = raid_device->starget;
                        if (starget && starget->hostdata) {
                                sas_target_priv_data = starget->hostdata;
                                sas_target_priv_data->deleted = 0;
                        } else
                                sas_target_priv_data = NULL;
                        raid_device->responding = 1;
                        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
                        starget_printk(KERN_INFO, raid_device->starget,
                            "handle(0x%04x), wwid(0x%016llx)\n", handle,
                            (unsigned long long)raid_device->wwid);

                        /*
                         * WARPDRIVE: The handles of the PDs might have changed
                         * across the host reset so re-initialize the
                         * required data for Direct IO
                         */
                        mpt3sas_init_warpdrive_properties(ioc, raid_device);
                        spin_lock_irqsave(&ioc->raid_device_lock, flags);
                        if (raid_device->handle == handle) {
                                spin_unlock_irqrestore(&ioc->raid_device_lock,
                                    flags);
                                return;
                        }
                        pr_info("\thandle changed from(0x%04x)!!!\n",
                            raid_device->handle);
                        raid_device->handle = handle;
                        if (sas_target_priv_data)
                                sas_target_priv_data->handle = handle;
                        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
                        return;
                }
        }
        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
}

/**
 * _scsih_search_responding_raid_devices -
 * @ioc: per adapter object
 *
 * After host reset, find out whether devices are still responding.
 * If not remove.
 */
static void
_scsih_search_responding_raid_devices(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2RaidVolPage1_t volume_pg1;
        Mpi2RaidVolPage0_t volume_pg0;
        Mpi2RaidPhysDiskPage0_t pd_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u16 ioc_status;
        u16 handle;
        u8 phys_disk_num;

        if (!ioc->ir_firmware)
                return;

        pr_info(MPT3SAS_FMT "search for raid volumes: start\n",
            ioc->name);

        if (list_empty(&ioc->raid_device_list))
                goto out;

        handle = 0xFFFF;
        while (!(mpt3sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
            &volume_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
                        break;
                handle = le16_to_cpu(volume_pg1.DevHandle);

                if (mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply,
                    &volume_pg0, MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, handle,
                     sizeof(Mpi2RaidVolPage0_t)))
                        continue;

                if (volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_OPTIMAL ||
                    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_ONLINE ||
                    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_DEGRADED)
                        _scsih_mark_responding_raid_device(ioc,
                            le64_to_cpu(volume_pg1.WWID), handle);
        }

        /* refresh the pd_handles */
        if (!ioc->is_warpdrive) {
                phys_disk_num = 0xFF;
                memset(ioc->pd_handles, 0, ioc->pd_handles_sz);
                while (!(mpt3sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
                    &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_GET_NEXT_PHYSDISKNUM,
                    phys_disk_num))) {
                        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                            MPI2_IOCSTATUS_MASK;
                        if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
                                break;
                        phys_disk_num = pd_pg0.PhysDiskNum;
                        handle = le16_to_cpu(pd_pg0.DevHandle);
                        set_bit(handle, ioc->pd_handles);
                }
        }
 out:
        pr_info(MPT3SAS_FMT "search for responding raid volumes: complete\n",
                ioc->name);
}

/**
 * _scsih_mark_responding_expander - mark a expander as responding
 * @ioc: per adapter object
 * @expander_pg0:SAS Expander Config Page0
 *
 * After host reset, find out whether devices are still responding.
 * Used in _scsih_remove_unresponsive_expanders.
 */
static void
_scsih_mark_responding_expander(struct MPT3SAS_ADAPTER *ioc,
        Mpi2ExpanderPage0_t *expander_pg0)
{
        struct _sas_node *sas_expander = NULL;
        unsigned long flags;
        int i;
        struct _enclosure_node *enclosure_dev = NULL;
        u16 handle = le16_to_cpu(expander_pg0->DevHandle);
        u16 enclosure_handle = le16_to_cpu(expander_pg0->EnclosureHandle);
        u64 sas_address = le64_to_cpu(expander_pg0->SASAddress);

        if (enclosure_handle)
                enclosure_dev =
                        mpt3sas_scsih_enclosure_find_by_handle(ioc,
                                                        enclosure_handle);

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        list_for_each_entry(sas_expander, &ioc->sas_expander_list, list) {
                if (sas_expander->sas_address != sas_address)
                        continue;
                sas_expander->responding = 1;

                if (enclosure_dev) {
                        sas_expander->enclosure_logical_id =
                            le64_to_cpu(enclosure_dev->pg0.EnclosureLogicalID);
                        sas_expander->enclosure_handle =
                            le16_to_cpu(expander_pg0->EnclosureHandle);
                }

                if (sas_expander->handle == handle)
                        goto out;
                pr_info("\texpander(0x%016llx): handle changed" \
                    " from(0x%04x) to (0x%04x)!!!\n",
                    (unsigned long long)sas_expander->sas_address,
                    sas_expander->handle, handle);
                sas_expander->handle = handle;
                for (i = 0 ; i < sas_expander->num_phys ; i++)
                        sas_expander->phy[i].handle = handle;
                goto out;
        }
 out:
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
}

/**
 * _scsih_search_responding_expanders -
 * @ioc: per adapter object
 *
 * After host reset, find out whether devices are still responding.
 * If not remove.
 */
static void
_scsih_search_responding_expanders(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2ExpanderPage0_t expander_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u16 ioc_status;
        u64 sas_address;
        u16 handle;

        pr_info(MPT3SAS_FMT "search for expanders: start\n", ioc->name);

        if (list_empty(&ioc->sas_expander_list))
                goto out;

        handle = 0xFFFF;
        while (!(mpt3sas_config_get_expander_pg0(ioc, &mpi_reply, &expander_pg0,
            MPI2_SAS_EXPAND_PGAD_FORM_GET_NEXT_HNDL, handle))) {

                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
                        break;

                handle = le16_to_cpu(expander_pg0.DevHandle);
                sas_address = le64_to_cpu(expander_pg0.SASAddress);
                pr_info("\texpander present: handle(0x%04x), sas_addr(0x%016llx)\n",
                        handle,
                    (unsigned long long)sas_address);
                _scsih_mark_responding_expander(ioc, &expander_pg0);
        }

 out:
        pr_info(MPT3SAS_FMT "search for expanders: complete\n", ioc->name);
}

/**
 * _scsih_remove_unresponding_devices - removing unresponding devices
 * @ioc: per adapter object
 */
static void
_scsih_remove_unresponding_devices(struct MPT3SAS_ADAPTER *ioc)
{
        struct _sas_device *sas_device, *sas_device_next;
        struct _sas_node *sas_expander, *sas_expander_next;
        struct _raid_device *raid_device, *raid_device_next;
        struct _pcie_device *pcie_device, *pcie_device_next;
        struct list_head tmp_list;
        unsigned long flags;
        LIST_HEAD(head);

        pr_info(MPT3SAS_FMT "removing unresponding devices: start\n",
            ioc->name);

        /* removing unresponding end devices */
        pr_info(MPT3SAS_FMT "removing unresponding devices: end-devices\n",
            ioc->name);
        /*
         * Iterate, pulling off devices marked as non-responding. We become the
         * owner for the reference the list had on any object we prune.
         */
        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        list_for_each_entry_safe(sas_device, sas_device_next,
            &ioc->sas_device_list, list) {
                if (!sas_device->responding)
                        list_move_tail(&sas_device->list, &head);
                else
                        sas_device->responding = 0;
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

        /*
         * Now, uninitialize and remove the unresponding devices we pruned.
         */
        list_for_each_entry_safe(sas_device, sas_device_next, &head, list) {
                _scsih_remove_device(ioc, sas_device);
                list_del_init(&sas_device->list);
                sas_device_put(sas_device);
        }

        pr_info(MPT3SAS_FMT
                " Removing unresponding devices: pcie end-devices\n"
                , ioc->name);
        INIT_LIST_HEAD(&head);
        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        list_for_each_entry_safe(pcie_device, pcie_device_next,
            &ioc->pcie_device_list, list) {
                if (!pcie_device->responding)
                        list_move_tail(&pcie_device->list, &head);
                else
                        pcie_device->responding = 0;
        }
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

        list_for_each_entry_safe(pcie_device, pcie_device_next, &head, list) {
                _scsih_pcie_device_remove_from_sml(ioc, pcie_device);
                list_del_init(&pcie_device->list);
                pcie_device_put(pcie_device);
        }

        /* removing unresponding volumes */
        if (ioc->ir_firmware) {
                pr_info(MPT3SAS_FMT "removing unresponding devices: volumes\n",
                        ioc->name);
                list_for_each_entry_safe(raid_device, raid_device_next,
                    &ioc->raid_device_list, list) {
                        if (!raid_device->responding)
                                _scsih_sas_volume_delete(ioc,
                                    raid_device->handle);
                        else
                                raid_device->responding = 0;
                }
        }

        /* removing unresponding expanders */
        pr_info(MPT3SAS_FMT "removing unresponding devices: expanders\n",
            ioc->name);
        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        INIT_LIST_HEAD(&tmp_list);
        list_for_each_entry_safe(sas_expander, sas_expander_next,
            &ioc->sas_expander_list, list) {
                if (!sas_expander->responding)
                        list_move_tail(&sas_expander->list, &tmp_list);
                else
                        sas_expander->responding = 0;
        }
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
        list_for_each_entry_safe(sas_expander, sas_expander_next, &tmp_list,
            list) {
                _scsih_expander_node_remove(ioc, sas_expander);
        }

        pr_info(MPT3SAS_FMT "removing unresponding devices: complete\n",
            ioc->name);

        /* unblock devices */
        _scsih_ublock_io_all_device(ioc);
}

static void
_scsih_refresh_expander_links(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_node *sas_expander, u16 handle)
{
        Mpi2ExpanderPage1_t expander_pg1;
        Mpi2ConfigReply_t mpi_reply;
        int i;

        for (i = 0 ; i < sas_expander->num_phys ; i++) {
                if ((mpt3sas_config_get_expander_pg1(ioc, &mpi_reply,
                    &expander_pg1, i, handle))) {
                        pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                            ioc->name, __FILE__, __LINE__, __func__);
                        return;
                }

                mpt3sas_transport_update_links(ioc, sas_expander->sas_address,
                    le16_to_cpu(expander_pg1.AttachedDevHandle), i,
                    expander_pg1.NegotiatedLinkRate >> 4);
        }
}

/**
 * _scsih_scan_for_devices_after_reset - scan for devices after host reset
 * @ioc: per adapter object
 */
static void
_scsih_scan_for_devices_after_reset(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2ExpanderPage0_t expander_pg0;
        Mpi2SasDevicePage0_t sas_device_pg0;
        Mpi26PCIeDevicePage0_t pcie_device_pg0;
        Mpi2RaidVolPage1_t volume_pg1;
        Mpi2RaidVolPage0_t volume_pg0;
        Mpi2RaidPhysDiskPage0_t pd_pg0;
        Mpi2EventIrConfigElement_t element;
        Mpi2ConfigReply_t mpi_reply;
        u8 phys_disk_num;
        u16 ioc_status;
        u16 handle, parent_handle;
        u64 sas_address;
        struct _sas_device *sas_device;
        struct _pcie_device *pcie_device;
        struct _sas_node *expander_device;
        static struct _raid_device *raid_device;
        u8 retry_count;
        unsigned long flags;

        pr_info(MPT3SAS_FMT "scan devices: start\n", ioc->name);

        _scsih_sas_host_refresh(ioc);

        pr_info(MPT3SAS_FMT "\tscan devices: expanders start\n", ioc->name);

        /* expanders */
        handle = 0xFFFF;
        while (!(mpt3sas_config_get_expander_pg0(ioc, &mpi_reply, &expander_pg0,
            MPI2_SAS_EXPAND_PGAD_FORM_GET_NEXT_HNDL, handle))) {
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_info(MPT3SAS_FMT "\tbreak from expander scan: " \
                            "ioc_status(0x%04x), loginfo(0x%08x)\n",
                            ioc->name, ioc_status,
                            le32_to_cpu(mpi_reply.IOCLogInfo));
                        break;
                }
                handle = le16_to_cpu(expander_pg0.DevHandle);
                spin_lock_irqsave(&ioc->sas_node_lock, flags);
                expander_device = mpt3sas_scsih_expander_find_by_sas_address(
                    ioc, le64_to_cpu(expander_pg0.SASAddress));
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                if (expander_device)
                        _scsih_refresh_expander_links(ioc, expander_device,
                            handle);
                else {
                        pr_info(MPT3SAS_FMT "\tBEFORE adding expander: " \
                            "handle (0x%04x), sas_addr(0x%016llx)\n", ioc->name,
                            handle, (unsigned long long)
                            le64_to_cpu(expander_pg0.SASAddress));
                        _scsih_expander_add(ioc, handle);
                        pr_info(MPT3SAS_FMT "\tAFTER adding expander: " \
                            "handle (0x%04x), sas_addr(0x%016llx)\n", ioc->name,
                            handle, (unsigned long long)
                            le64_to_cpu(expander_pg0.SASAddress));
                }
        }

        pr_info(MPT3SAS_FMT "\tscan devices: expanders complete\n",
            ioc->name);

        if (!ioc->ir_firmware)
                goto skip_to_sas;

        pr_info(MPT3SAS_FMT "\tscan devices: phys disk start\n", ioc->name);

        /* phys disk */
        phys_disk_num = 0xFF;
        while (!(mpt3sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
            &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_GET_NEXT_PHYSDISKNUM,
            phys_disk_num))) {
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_info(MPT3SAS_FMT "\tbreak from phys disk scan: "\
                            "ioc_status(0x%04x), loginfo(0x%08x)\n",
                            ioc->name, ioc_status,
                            le32_to_cpu(mpi_reply.IOCLogInfo));
                        break;
                }
                phys_disk_num = pd_pg0.PhysDiskNum;
                handle = le16_to_cpu(pd_pg0.DevHandle);
                sas_device = mpt3sas_get_sdev_by_handle(ioc, handle);
                if (sas_device) {
                        sas_device_put(sas_device);
                        continue;
                }
                if (mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply,
                    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
                    handle) != 0)
                        continue;
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_info(MPT3SAS_FMT "\tbreak from phys disk scan " \
                            "ioc_status(0x%04x), loginfo(0x%08x)\n",
                            ioc->name, ioc_status,
                            le32_to_cpu(mpi_reply.IOCLogInfo));
                        break;
                }
                parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
                if (!_scsih_get_sas_address(ioc, parent_handle,
                    &sas_address)) {
                        pr_info(MPT3SAS_FMT "\tBEFORE adding phys disk: " \
                            " handle (0x%04x), sas_addr(0x%016llx)\n",
                            ioc->name, handle, (unsigned long long)
                            le64_to_cpu(sas_device_pg0.SASAddress));
                        mpt3sas_transport_update_links(ioc, sas_address,
                            handle, sas_device_pg0.PhyNum,
                            MPI2_SAS_NEG_LINK_RATE_1_5);
                        set_bit(handle, ioc->pd_handles);
                        retry_count = 0;
                        /* This will retry adding the end device.
                         * _scsih_add_device() will decide on retries and
                         * return "1" when it should be retried
                         */
                        while (_scsih_add_device(ioc, handle, retry_count++,
                            1)) {
                                ssleep(1);
                        }
                        pr_info(MPT3SAS_FMT "\tAFTER adding phys disk: " \
                            " handle (0x%04x), sas_addr(0x%016llx)\n",
                            ioc->name, handle, (unsigned long long)
                            le64_to_cpu(sas_device_pg0.SASAddress));
                }
        }

        pr_info(MPT3SAS_FMT "\tscan devices: phys disk complete\n",
            ioc->name);

        pr_info(MPT3SAS_FMT "\tscan devices: volumes start\n", ioc->name);

        /* volumes */
        handle = 0xFFFF;
        while (!(mpt3sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
            &volume_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_info(MPT3SAS_FMT "\tbreak from volume scan: " \
                            "ioc_status(0x%04x), loginfo(0x%08x)\n",
                            ioc->name, ioc_status,
                            le32_to_cpu(mpi_reply.IOCLogInfo));
                        break;
                }
                handle = le16_to_cpu(volume_pg1.DevHandle);
                spin_lock_irqsave(&ioc->raid_device_lock, flags);
                raid_device = _scsih_raid_device_find_by_wwid(ioc,
                    le64_to_cpu(volume_pg1.WWID));
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
                if (raid_device)
                        continue;
                if (mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply,
                    &volume_pg0, MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, handle,
                     sizeof(Mpi2RaidVolPage0_t)))
                        continue;
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_info(MPT3SAS_FMT "\tbreak from volume scan: " \
                            "ioc_status(0x%04x), loginfo(0x%08x)\n",
                            ioc->name, ioc_status,
                            le32_to_cpu(mpi_reply.IOCLogInfo));
                        break;
                }
                if (volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_OPTIMAL ||
                    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_ONLINE ||
                    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_DEGRADED) {
                        memset(&element, 0, sizeof(Mpi2EventIrConfigElement_t));
                        element.ReasonCode = MPI2_EVENT_IR_CHANGE_RC_ADDED;
                        element.VolDevHandle = volume_pg1.DevHandle;
                        pr_info(MPT3SAS_FMT
                                "\tBEFORE adding volume: handle (0x%04x)\n",
                                ioc->name, volume_pg1.DevHandle);
                        _scsih_sas_volume_add(ioc, &element);
                        pr_info(MPT3SAS_FMT
                                "\tAFTER adding volume: handle (0x%04x)\n",
                                ioc->name, volume_pg1.DevHandle);
                }
        }

        pr_info(MPT3SAS_FMT "\tscan devices: volumes complete\n",
            ioc->name);

 skip_to_sas:

        pr_info(MPT3SAS_FMT "\tscan devices: end devices start\n",
            ioc->name);

        /* sas devices */
        handle = 0xFFFF;
        while (!(mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply,
            &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_GET_NEXT_HANDLE,
            handle))) {
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
                    MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_info(MPT3SAS_FMT "\tbreak from end device scan:"\
                            " ioc_status(0x%04x), loginfo(0x%08x)\n",
                            ioc->name, ioc_status,
                            le32_to_cpu(mpi_reply.IOCLogInfo));
                        break;
                }
                handle = le16_to_cpu(sas_device_pg0.DevHandle);
                if (!(_scsih_is_end_device(
                    le32_to_cpu(sas_device_pg0.DeviceInfo))))
                        continue;
                sas_device = mpt3sas_get_sdev_by_addr(ioc,
                    le64_to_cpu(sas_device_pg0.SASAddress));
                if (sas_device) {
                        sas_device_put(sas_device);
                        continue;
                }
                parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
                if (!_scsih_get_sas_address(ioc, parent_handle, &sas_address)) {
                        pr_info(MPT3SAS_FMT "\tBEFORE adding end device: " \
                            "handle (0x%04x), sas_addr(0x%016llx)\n", ioc->name,
                            handle, (unsigned long long)
                            le64_to_cpu(sas_device_pg0.SASAddress));
                        mpt3sas_transport_update_links(ioc, sas_address, handle,
                            sas_device_pg0.PhyNum, MPI2_SAS_NEG_LINK_RATE_1_5);
                        retry_count = 0;
                        /* This will retry adding the end device.
                         * _scsih_add_device() will decide on retries and
                         * return "1" when it should be retried
                         */
                        while (_scsih_add_device(ioc, handle, retry_count++,
                            0)) {
                                ssleep(1);
                        }
                        pr_info(MPT3SAS_FMT "\tAFTER adding end device: " \
                            "handle (0x%04x), sas_addr(0x%016llx)\n", ioc->name,
                            handle, (unsigned long long)
                            le64_to_cpu(sas_device_pg0.SASAddress));
                }
        }
        pr_info(MPT3SAS_FMT "\tscan devices: end devices complete\n",
            ioc->name);
        pr_info(MPT3SAS_FMT "\tscan devices: pcie end devices start\n",
            ioc->name);

        /* pcie devices */
        handle = 0xFFFF;
        while (!(mpt3sas_config_get_pcie_device_pg0(ioc, &mpi_reply,
                &pcie_device_pg0, MPI26_PCIE_DEVICE_PGAD_FORM_GET_NEXT_HANDLE,
                handle))) {
                ioc_status = le16_to_cpu(mpi_reply.IOCStatus)
                                & MPI2_IOCSTATUS_MASK;
                if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                        pr_info(MPT3SAS_FMT "\tbreak from pcie end device"
                                " scan: ioc_status(0x%04x), loginfo(0x%08x)\n",
                                ioc->name, ioc_status,
                                le32_to_cpu(mpi_reply.IOCLogInfo));
                        break;
                }
                handle = le16_to_cpu(pcie_device_pg0.DevHandle);
                if (!(_scsih_is_nvme_device(
                        le32_to_cpu(pcie_device_pg0.DeviceInfo))))
                        continue;
                pcie_device = mpt3sas_get_pdev_by_wwid(ioc,
                                le64_to_cpu(pcie_device_pg0.WWID));
                if (pcie_device) {
                        pcie_device_put(pcie_device);
                        continue;
                }
                retry_count = 0;
                parent_handle = le16_to_cpu(pcie_device_pg0.ParentDevHandle);
                _scsih_pcie_add_device(ioc, handle);

                pr_info(MPT3SAS_FMT "\tAFTER adding pcie end device: "
                        "handle (0x%04x), wwid(0x%016llx)\n", ioc->name,
                        handle,
                        (unsigned long long) le64_to_cpu(pcie_device_pg0.WWID));
        }
        pr_info(MPT3SAS_FMT "\tpcie devices: pcie end devices complete\n",
                ioc->name);
        pr_info(MPT3SAS_FMT "scan devices: complete\n", ioc->name);
}

/**
 * mpt3sas_scsih_reset_handler - reset callback handler (for scsih)
 * @ioc: per adapter object
 *
 * The handler for doing any required cleanup or initialization.
 */
void mpt3sas_scsih_pre_reset_handler(struct MPT3SAS_ADAPTER *ioc)
{
        dtmprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: MPT3_IOC_PRE_RESET\n", ioc->name, __func__));
}

/**
 * mpt3sas_scsih_after_reset_handler - reset callback handler (for scsih)
 * @ioc: per adapter object
 *
 * The handler for doing any required cleanup or initialization.
 */
void
mpt3sas_scsih_after_reset_handler(struct MPT3SAS_ADAPTER *ioc)
{
        dtmprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: MPT3_IOC_AFTER_RESET\n", ioc->name, __func__));
        if (ioc->scsih_cmds.status & MPT3_CMD_PENDING) {
                ioc->scsih_cmds.status |= MPT3_CMD_RESET;
                mpt3sas_base_free_smid(ioc, ioc->scsih_cmds.smid);
                complete(&ioc->scsih_cmds.done);
        }
        if (ioc->tm_cmds.status & MPT3_CMD_PENDING) {
                ioc->tm_cmds.status |= MPT3_CMD_RESET;
                mpt3sas_base_free_smid(ioc, ioc->tm_cmds.smid);
                complete(&ioc->tm_cmds.done);
        }

        memset(ioc->pend_os_device_add, 0, ioc->pend_os_device_add_sz);
        memset(ioc->device_remove_in_progress, 0,
               ioc->device_remove_in_progress_sz);
        _scsih_fw_event_cleanup_queue(ioc);
        _scsih_flush_running_cmds(ioc);
}

/**
 * mpt3sas_scsih_reset_handler - reset callback handler (for scsih)
 * @ioc: per adapter object
 *
 * The handler for doing any required cleanup or initialization.
 */
void
mpt3sas_scsih_reset_done_handler(struct MPT3SAS_ADAPTER *ioc)
{
        dtmprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: MPT3_IOC_DONE_RESET\n", ioc->name, __func__));
        if ((!ioc->is_driver_loading) && !(disable_discovery > 0 &&
                                           !ioc->sas_hba.num_phys)) {
                _scsih_prep_device_scan(ioc);
                _scsih_create_enclosure_list_after_reset(ioc);
                _scsih_search_responding_sas_devices(ioc);
                _scsih_search_responding_pcie_devices(ioc);
                _scsih_search_responding_raid_devices(ioc);
                _scsih_search_responding_expanders(ioc);
                _scsih_error_recovery_delete_devices(ioc);
        }
}

/**
 * _mpt3sas_fw_work - delayed task for processing firmware events
 * @ioc: per adapter object
 * @fw_event: The fw_event_work object
 * Context: user.
 */
static void
_mpt3sas_fw_work(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work *fw_event)
{
        _scsih_fw_event_del_from_list(ioc, fw_event);

        /* the queue is being flushed so ignore this event */
        if (ioc->remove_host || ioc->pci_error_recovery) {
                fw_event_work_put(fw_event);
                return;
        }

        switch (fw_event->event) {
        case MPT3SAS_PROCESS_TRIGGER_DIAG:
                mpt3sas_process_trigger_data(ioc,
                        (struct SL_WH_TRIGGERS_EVENT_DATA_T *)
                        fw_event->event_data);
                break;
        case MPT3SAS_REMOVE_UNRESPONDING_DEVICES:
                while (scsi_host_in_recovery(ioc->shost) ||
                                         ioc->shost_recovery) {
                        /*
                         * If we're unloading, bail. Otherwise, this can become
                         * an infinite loop.
                         */
                        if (ioc->remove_host)
                                goto out;
                        ssleep(1);
                }
                _scsih_remove_unresponding_devices(ioc);
                _scsih_scan_for_devices_after_reset(ioc);
                break;
        case MPT3SAS_PORT_ENABLE_COMPLETE:
                ioc->start_scan = 0;
                if (missing_delay[0] != -1 && missing_delay[1] != -1)
                        mpt3sas_base_update_missing_delay(ioc, missing_delay[0],
                            missing_delay[1]);
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                        "port enable: complete from worker thread\n",
                        ioc->name));
                break;
        case MPT3SAS_TURN_ON_PFA_LED:
                _scsih_turn_on_pfa_led(ioc, fw_event->device_handle);
                break;
        case MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST:
                _scsih_sas_topology_change_event(ioc, fw_event);
                break;
        case MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE:
                _scsih_sas_device_status_change_event(ioc, fw_event);
                break;
        case MPI2_EVENT_SAS_DISCOVERY:
                _scsih_sas_discovery_event(ioc, fw_event);
                break;
        case MPI2_EVENT_SAS_DEVICE_DISCOVERY_ERROR:
                _scsih_sas_device_discovery_error_event(ioc, fw_event);
                break;
        case MPI2_EVENT_SAS_BROADCAST_PRIMITIVE:
                _scsih_sas_broadcast_primitive_event(ioc, fw_event);
                break;
        case MPI2_EVENT_SAS_ENCL_DEVICE_STATUS_CHANGE:
                _scsih_sas_enclosure_dev_status_change_event(ioc,
                    fw_event);
                break;
        case MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST:
                _scsih_sas_ir_config_change_event(ioc, fw_event);
                break;
        case MPI2_EVENT_IR_VOLUME:
                _scsih_sas_ir_volume_event(ioc, fw_event);
                break;
        case MPI2_EVENT_IR_PHYSICAL_DISK:
                _scsih_sas_ir_physical_disk_event(ioc, fw_event);
                break;
        case MPI2_EVENT_IR_OPERATION_STATUS:
                _scsih_sas_ir_operation_status_event(ioc, fw_event);
                break;
        case MPI2_EVENT_PCIE_DEVICE_STATUS_CHANGE:
                _scsih_pcie_device_status_change_event(ioc, fw_event);
                break;
        case MPI2_EVENT_PCIE_ENUMERATION:
                _scsih_pcie_enumeration_event(ioc, fw_event);
                break;
        case MPI2_EVENT_PCIE_TOPOLOGY_CHANGE_LIST:
                _scsih_pcie_topology_change_event(ioc, fw_event);
                        return;
        break;
        }
out:
        fw_event_work_put(fw_event);
}

/**
 * _firmware_event_work
 * @work: The fw_event_work object
 * Context: user.
 *
 * wrappers for the work thread handling firmware events
 */

static void
_firmware_event_work(struct work_struct *work)
{
        struct fw_event_work *fw_event = container_of(work,
            struct fw_event_work, work);

        _mpt3sas_fw_work(fw_event->ioc, fw_event);
}

/**
 * mpt3sas_scsih_event_callback - firmware event handler (called at ISR time)
 * @ioc: per adapter object
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 * Context: interrupt.
 *
 * This function merely adds a new work task into ioc->firmware_event_thread.
 * The tasks are worked from _firmware_event_work in user context.
 *
 * Return: 1 meaning mf should be freed from _base_interrupt
 *         0 means the mf is freed from this function.
 */
u8
mpt3sas_scsih_event_callback(struct MPT3SAS_ADAPTER *ioc, u8 msix_index,
        u32 reply)
{
        struct fw_event_work *fw_event;
        Mpi2EventNotificationReply_t *mpi_reply;
        u16 event;
        u16 sz;
        Mpi26EventDataActiveCableExcept_t *ActiveCableEventData;

        /* events turned off due to host reset */
        if (ioc->pci_error_recovery)
                return 1;

        mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);

        if (unlikely(!mpi_reply)) {
                pr_err(MPT3SAS_FMT "mpi_reply not valid at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return 1;
        }

        event = le16_to_cpu(mpi_reply->Event);

        if (event != MPI2_EVENT_LOG_ENTRY_ADDED)
                mpt3sas_trigger_event(ioc, event, 0);

        switch (event) {
        /* handle these */
        case MPI2_EVENT_SAS_BROADCAST_PRIMITIVE:
        {
                Mpi2EventDataSasBroadcastPrimitive_t *baen_data =
                    (Mpi2EventDataSasBroadcastPrimitive_t *)
                    mpi_reply->EventData;

                if (baen_data->Primitive !=
                    MPI2_EVENT_PRIMITIVE_ASYNCHRONOUS_EVENT)
                        return 1;

                if (ioc->broadcast_aen_busy) {
                        ioc->broadcast_aen_pending++;
                        return 1;
                } else
                        ioc->broadcast_aen_busy = 1;
                break;
        }

        case MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST:
                _scsih_check_topo_delete_events(ioc,
                    (Mpi2EventDataSasTopologyChangeList_t *)
                    mpi_reply->EventData);
                break;
        case MPI2_EVENT_PCIE_TOPOLOGY_CHANGE_LIST:
        _scsih_check_pcie_topo_remove_events(ioc,
                    (Mpi26EventDataPCIeTopologyChangeList_t *)
                    mpi_reply->EventData);
                break;
        case MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST:
                _scsih_check_ir_config_unhide_events(ioc,
                    (Mpi2EventDataIrConfigChangeList_t *)
                    mpi_reply->EventData);
                break;
        case MPI2_EVENT_IR_VOLUME:
                _scsih_check_volume_delete_events(ioc,
                    (Mpi2EventDataIrVolume_t *)
                    mpi_reply->EventData);
                break;
        case MPI2_EVENT_LOG_ENTRY_ADDED:
        {
                Mpi2EventDataLogEntryAdded_t *log_entry;
                u32 *log_code;

                if (!ioc->is_warpdrive)
                        break;

                log_entry = (Mpi2EventDataLogEntryAdded_t *)
                    mpi_reply->EventData;
                log_code = (u32 *)log_entry->LogData;

                if (le16_to_cpu(log_entry->LogEntryQualifier)
                    != MPT2_WARPDRIVE_LOGENTRY)
                        break;

                switch (le32_to_cpu(*log_code)) {
                case MPT2_WARPDRIVE_LC_SSDT:
                        pr_warn(MPT3SAS_FMT "WarpDrive Warning: "
                            "IO Throttling has occurred in the WarpDrive "
                            "subsystem. Check WarpDrive documentation for "
                            "additional details.\n", ioc->name);
                        break;
                case MPT2_WARPDRIVE_LC_SSDLW:
                        pr_warn(MPT3SAS_FMT "WarpDrive Warning: "
                            "Program/Erase Cycles for the WarpDrive subsystem "
                            "in degraded range. Check WarpDrive documentation "
                            "for additional details.\n", ioc->name);
                        break;
                case MPT2_WARPDRIVE_LC_SSDLF:
                        pr_err(MPT3SAS_FMT "WarpDrive Fatal Error: "
                            "There are no Program/Erase Cycles for the "
                            "WarpDrive subsystem. The storage device will be "
                            "in read-only mode. Check WarpDrive documentation "
                            "for additional details.\n", ioc->name);
                        break;
                case MPT2_WARPDRIVE_LC_BRMF:
                        pr_err(MPT3SAS_FMT "WarpDrive Fatal Error: "
                            "The Backup Rail Monitor has failed on the "
                            "WarpDrive subsystem. Check WarpDrive "
                            "documentation for additional details.\n",
                            ioc->name);
                        break;
                }

                break;
        }
        case MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE:
        case MPI2_EVENT_IR_OPERATION_STATUS:
        case MPI2_EVENT_SAS_DISCOVERY:
        case MPI2_EVENT_SAS_DEVICE_DISCOVERY_ERROR:
        case MPI2_EVENT_SAS_ENCL_DEVICE_STATUS_CHANGE:
        case MPI2_EVENT_IR_PHYSICAL_DISK:
        case MPI2_EVENT_PCIE_ENUMERATION:
        case MPI2_EVENT_PCIE_DEVICE_STATUS_CHANGE:
                break;

        case MPI2_EVENT_TEMP_THRESHOLD:
                _scsih_temp_threshold_events(ioc,
                        (Mpi2EventDataTemperature_t *)
                        mpi_reply->EventData);
                break;
        case MPI2_EVENT_ACTIVE_CABLE_EXCEPTION:
                ActiveCableEventData =
                    (Mpi26EventDataActiveCableExcept_t *) mpi_reply->EventData;
                switch (ActiveCableEventData->ReasonCode) {
                case MPI26_EVENT_ACTIVE_CABLE_INSUFFICIENT_POWER:
                        pr_notice(MPT3SAS_FMT
                            "Currently an active cable with ReceptacleID %d\n",
                            ioc->name, ActiveCableEventData->ReceptacleID);
                        pr_notice("cannot be powered and devices connected\n");
                        pr_notice("to this active cable will not be seen\n");
                        pr_notice("This active cable requires %d mW of power\n",
                             ActiveCableEventData->ActiveCablePowerRequirement);
                        break;

                case MPI26_EVENT_ACTIVE_CABLE_DEGRADED:
                        pr_notice(MPT3SAS_FMT
                            "Currently a cable with ReceptacleID %d\n",
                            ioc->name, ActiveCableEventData->ReceptacleID);
                        pr_notice(
                            "is not running at optimal speed(12 Gb/s rate)\n");
                        break;
                }

                break;

        default: /* ignore the rest */
                return 1;
        }

        sz = le16_to_cpu(mpi_reply->EventDataLength) * 4;
        fw_event = alloc_fw_event_work(sz);
        if (!fw_event) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return 1;
        }

        memcpy(fw_event->event_data, mpi_reply->EventData, sz);
        fw_event->ioc = ioc;
        fw_event->VF_ID = mpi_reply->VF_ID;
        fw_event->VP_ID = mpi_reply->VP_ID;
        fw_event->event = event;
        _scsih_fw_event_add(ioc, fw_event);
        fw_event_work_put(fw_event);
        return 1;
}

/**
 * _scsih_expander_node_remove - removing expander device from list.
 * @ioc: per adapter object
 * @sas_expander: the sas_device object
 *
 * Removing object and freeing associated memory from the
 * ioc->sas_expander_list.
 */
static void
_scsih_expander_node_remove(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_node *sas_expander)
{
        struct _sas_port *mpt3sas_port, *next;
        unsigned long flags;

        /* remove sibling ports attached to this expander */
        list_for_each_entry_safe(mpt3sas_port, next,
           &sas_expander->sas_port_list, port_list) {
                if (ioc->shost_recovery)
                        return;
                if (mpt3sas_port->remote_identify.device_type ==
                    SAS_END_DEVICE)
                        mpt3sas_device_remove_by_sas_address(ioc,
                            mpt3sas_port->remote_identify.sas_address);
                else if (mpt3sas_port->remote_identify.device_type ==
                    SAS_EDGE_EXPANDER_DEVICE ||
                    mpt3sas_port->remote_identify.device_type ==
                    SAS_FANOUT_EXPANDER_DEVICE)
                        mpt3sas_expander_remove(ioc,
                            mpt3sas_port->remote_identify.sas_address);
        }

        mpt3sas_transport_port_remove(ioc, sas_expander->sas_address,
            sas_expander->sas_address_parent);

        pr_info(MPT3SAS_FMT
                "expander_remove: handle(0x%04x), sas_addr(0x%016llx)\n",
                ioc->name,
            sas_expander->handle, (unsigned long long)
            sas_expander->sas_address);

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        list_del(&sas_expander->list);
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        kfree(sas_expander->phy);
        kfree(sas_expander);
}

/**
 * _scsih_ir_shutdown - IR shutdown notification
 * @ioc: per adapter object
 *
 * Sending RAID Action to alert the Integrated RAID subsystem of the IOC that
 * the host system is shutting down.
 */
static void
_scsih_ir_shutdown(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2RaidActionRequest_t *mpi_request;
        Mpi2RaidActionReply_t *mpi_reply;
        u16 smid;

        /* is IR firmware build loaded ? */
        if (!ioc->ir_firmware)
                return;

        /* are there any volumes ? */
        if (list_empty(&ioc->raid_device_list))
                return;

        mutex_lock(&ioc->scsih_cmds.mutex);

        if (ioc->scsih_cmds.status != MPT3_CMD_NOT_USED) {
                pr_err(MPT3SAS_FMT "%s: scsih_cmd in use\n",
                    ioc->name, __func__);
                goto out;
        }
        ioc->scsih_cmds.status = MPT3_CMD_PENDING;

        smid = mpt3sas_base_get_smid(ioc, ioc->scsih_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                ioc->scsih_cmds.status = MPT3_CMD_NOT_USED;
                goto out;
        }

        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->scsih_cmds.smid = smid;
        memset(mpi_request, 0, sizeof(Mpi2RaidActionRequest_t));

        mpi_request->Function = MPI2_FUNCTION_RAID_ACTION;
        mpi_request->Action = MPI2_RAID_ACTION_SYSTEM_SHUTDOWN_INITIATED;

        if (!ioc->hide_ir_msg)
                pr_info(MPT3SAS_FMT "IR shutdown (sending)\n", ioc->name);
        init_completion(&ioc->scsih_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        wait_for_completion_timeout(&ioc->scsih_cmds.done, 10*HZ);

        if (!(ioc->scsih_cmds.status & MPT3_CMD_COMPLETE)) {
                pr_err(MPT3SAS_FMT "%s: timeout\n",
                    ioc->name, __func__);
                goto out;
        }

        if (ioc->scsih_cmds.status & MPT3_CMD_REPLY_VALID) {
                mpi_reply = ioc->scsih_cmds.reply;
                if (!ioc->hide_ir_msg)
                        pr_info(MPT3SAS_FMT "IR shutdown "
                           "(complete): ioc_status(0x%04x), loginfo(0x%08x)\n",
                            ioc->name, le16_to_cpu(mpi_reply->IOCStatus),
                            le32_to_cpu(mpi_reply->IOCLogInfo));
        }

 out:
        ioc->scsih_cmds.status = MPT3_CMD_NOT_USED;
        mutex_unlock(&ioc->scsih_cmds.mutex);
}

/**
 * scsih_remove - detach and remove add host
 * @pdev: PCI device struct
 *
 * Routine called when unloading the driver.
 */
static void scsih_remove(struct pci_dev *pdev)
{
        struct Scsi_Host *shost = pci_get_drvdata(pdev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        struct _sas_port *mpt3sas_port, *next_port;
        struct _raid_device *raid_device, *next;
        struct MPT3SAS_TARGET *sas_target_priv_data;
        struct _pcie_device *pcie_device, *pcienext;
        struct workqueue_struct *wq;
        unsigned long flags;

        ioc->remove_host = 1;

        mpt3sas_wait_for_commands_to_complete(ioc);
        _scsih_flush_running_cmds(ioc);

        _scsih_fw_event_cleanup_queue(ioc);

        spin_lock_irqsave(&ioc->fw_event_lock, flags);
        wq = ioc->firmware_event_thread;
        ioc->firmware_event_thread = NULL;
        spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
        if (wq)
                destroy_workqueue(wq);

        /* release all the volumes */
        _scsih_ir_shutdown(ioc);
        sas_remove_host(shost);
        list_for_each_entry_safe(raid_device, next, &ioc->raid_device_list,
            list) {
                if (raid_device->starget) {
                        sas_target_priv_data =
                            raid_device->starget->hostdata;
                        sas_target_priv_data->deleted = 1;
                        scsi_remove_target(&raid_device->starget->dev);
                }
                pr_info(MPT3SAS_FMT "removing handle(0x%04x), wwid(0x%016llx)\n",
                        ioc->name,  raid_device->handle,
                    (unsigned long long) raid_device->wwid);
                _scsih_raid_device_remove(ioc, raid_device);
        }
        list_for_each_entry_safe(pcie_device, pcienext, &ioc->pcie_device_list,
                list) {
                _scsih_pcie_device_remove_from_sml(ioc, pcie_device);
                list_del_init(&pcie_device->list);
                pcie_device_put(pcie_device);
        }

        /* free ports attached to the sas_host */
        list_for_each_entry_safe(mpt3sas_port, next_port,
           &ioc->sas_hba.sas_port_list, port_list) {
                if (mpt3sas_port->remote_identify.device_type ==
                    SAS_END_DEVICE)
                        mpt3sas_device_remove_by_sas_address(ioc,
                            mpt3sas_port->remote_identify.sas_address);
                else if (mpt3sas_port->remote_identify.device_type ==
                    SAS_EDGE_EXPANDER_DEVICE ||
                    mpt3sas_port->remote_identify.device_type ==
                    SAS_FANOUT_EXPANDER_DEVICE)
                        mpt3sas_expander_remove(ioc,
                            mpt3sas_port->remote_identify.sas_address);
        }

        /* free phys attached to the sas_host */
        if (ioc->sas_hba.num_phys) {
                kfree(ioc->sas_hba.phy);
                ioc->sas_hba.phy = NULL;
                ioc->sas_hba.num_phys = 0;
        }

        mpt3sas_base_detach(ioc);
        spin_lock(&gioc_lock);
        list_del(&ioc->list);
        spin_unlock(&gioc_lock);
        scsi_host_put(shost);
}

/**
 * scsih_shutdown - routine call during system shutdown
 * @pdev: PCI device struct
 */
static void
scsih_shutdown(struct pci_dev *pdev)
{
        struct Scsi_Host *shost = pci_get_drvdata(pdev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        struct workqueue_struct *wq;
        unsigned long flags;

        ioc->remove_host = 1;

        mpt3sas_wait_for_commands_to_complete(ioc);
        _scsih_flush_running_cmds(ioc);

        _scsih_fw_event_cleanup_queue(ioc);

        spin_lock_irqsave(&ioc->fw_event_lock, flags);
        wq = ioc->firmware_event_thread;
        ioc->firmware_event_thread = NULL;
        spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
        if (wq)
                destroy_workqueue(wq);

        _scsih_ir_shutdown(ioc);
        mpt3sas_base_detach(ioc);
}


/**
 * _scsih_probe_boot_devices - reports 1st device
 * @ioc: per adapter object
 *
 * If specified in bios page 2, this routine reports the 1st
 * device scsi-ml or sas transport for persistent boot device
 * purposes.  Please refer to function _scsih_determine_boot_device()
 */
static void
_scsih_probe_boot_devices(struct MPT3SAS_ADAPTER *ioc)
{
        u32 channel;
        void *device;
        struct _sas_device *sas_device;
        struct _raid_device *raid_device;
        struct _pcie_device *pcie_device;
        u16 handle;
        u64 sas_address_parent;
        u64 sas_address;
        unsigned long flags;
        int rc;
        int tid;

         /* no Bios, return immediately */
        if (!ioc->bios_pg3.BiosVersion)
                return;

        device = NULL;
        if (ioc->req_boot_device.device) {
                device =  ioc->req_boot_device.device;
                channel = ioc->req_boot_device.channel;
        } else if (ioc->req_alt_boot_device.device) {
                device =  ioc->req_alt_boot_device.device;
                channel = ioc->req_alt_boot_device.channel;
        } else if (ioc->current_boot_device.device) {
                device =  ioc->current_boot_device.device;
                channel = ioc->current_boot_device.channel;
        }

        if (!device)
                return;

        if (channel == RAID_CHANNEL) {
                raid_device = device;
                rc = scsi_add_device(ioc->shost, RAID_CHANNEL,
                    raid_device->id, 0);
                if (rc)
                        _scsih_raid_device_remove(ioc, raid_device);
        } else if (channel == PCIE_CHANNEL) {
                spin_lock_irqsave(&ioc->pcie_device_lock, flags);
                pcie_device = device;
                tid = pcie_device->id;
                list_move_tail(&pcie_device->list, &ioc->pcie_device_list);
                spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
                rc = scsi_add_device(ioc->shost, PCIE_CHANNEL, tid, 0);
                if (rc)
                        _scsih_pcie_device_remove(ioc, pcie_device);
        } else {
                spin_lock_irqsave(&ioc->sas_device_lock, flags);
                sas_device = device;
                handle = sas_device->handle;
                sas_address_parent = sas_device->sas_address_parent;
                sas_address = sas_device->sas_address;
                list_move_tail(&sas_device->list, &ioc->sas_device_list);
                spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

                if (ioc->hide_drives)
                        return;
                if (!mpt3sas_transport_port_add(ioc, handle,
                    sas_address_parent)) {
                        _scsih_sas_device_remove(ioc, sas_device);
                } else if (!sas_device->starget) {
                        if (!ioc->is_driver_loading) {
                                mpt3sas_transport_port_remove(ioc,
                                    sas_address,
                                    sas_address_parent);
                                _scsih_sas_device_remove(ioc, sas_device);
                        }
                }
        }
}

/**
 * _scsih_probe_raid - reporting raid volumes to scsi-ml
 * @ioc: per adapter object
 *
 * Called during initial loading of the driver.
 */
static void
_scsih_probe_raid(struct MPT3SAS_ADAPTER *ioc)
{
        struct _raid_device *raid_device, *raid_next;
        int rc;

        list_for_each_entry_safe(raid_device, raid_next,
            &ioc->raid_device_list, list) {
                if (raid_device->starget)
                        continue;
                rc = scsi_add_device(ioc->shost, RAID_CHANNEL,
                    raid_device->id, 0);
                if (rc)
                        _scsih_raid_device_remove(ioc, raid_device);
        }
}

static struct _sas_device *get_next_sas_device(struct MPT3SAS_ADAPTER *ioc)
{
        struct _sas_device *sas_device = NULL;
        unsigned long flags;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        if (!list_empty(&ioc->sas_device_init_list)) {
                sas_device = list_first_entry(&ioc->sas_device_init_list,
                                struct _sas_device, list);
                sas_device_get(sas_device);
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);

        return sas_device;
}

static void sas_device_make_active(struct MPT3SAS_ADAPTER *ioc,
                struct _sas_device *sas_device)
{
        unsigned long flags;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);

        /*
         * Since we dropped the lock during the call to port_add(), we need to
         * be careful here that somebody else didn't move or delete this item
         * while we were busy with other things.
         *
         * If it was on the list, we need a put() for the reference the list
         * had. Either way, we need a get() for the destination list.
         */
        if (!list_empty(&sas_device->list)) {
                list_del_init(&sas_device->list);
                sas_device_put(sas_device);
        }

        sas_device_get(sas_device);
        list_add_tail(&sas_device->list, &ioc->sas_device_list);

        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
}

/**
 * _scsih_probe_sas - reporting sas devices to sas transport
 * @ioc: per adapter object
 *
 * Called during initial loading of the driver.
 */
static void
_scsih_probe_sas(struct MPT3SAS_ADAPTER *ioc)
{
        struct _sas_device *sas_device;

        if (ioc->hide_drives)
                return;

        while ((sas_device = get_next_sas_device(ioc))) {
                if (!mpt3sas_transport_port_add(ioc, sas_device->handle,
                    sas_device->sas_address_parent)) {
                        _scsih_sas_device_remove(ioc, sas_device);
                        sas_device_put(sas_device);
                        continue;
                } else if (!sas_device->starget) {
                        /*
                         * When asyn scanning is enabled, its not possible to
                         * remove devices while scanning is turned on due to an
                         * oops in scsi_sysfs_add_sdev()->add_device()->
                         * sysfs_addrm_start()
                         */
                        if (!ioc->is_driver_loading) {
                                mpt3sas_transport_port_remove(ioc,
                                    sas_device->sas_address,
                                    sas_device->sas_address_parent);
                                _scsih_sas_device_remove(ioc, sas_device);
                                sas_device_put(sas_device);
                                continue;
                        }
                }
                sas_device_make_active(ioc, sas_device);
                sas_device_put(sas_device);
        }
}

/**
 * get_next_pcie_device - Get the next pcie device
 * @ioc: per adapter object
 *
 * Get the next pcie device from pcie_device_init_list list.
 *
 * Return: pcie device structure if pcie_device_init_list list is not empty
 * otherwise returns NULL
 */
static struct _pcie_device *get_next_pcie_device(struct MPT3SAS_ADAPTER *ioc)
{
        struct _pcie_device *pcie_device = NULL;
        unsigned long flags;

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);
        if (!list_empty(&ioc->pcie_device_init_list)) {
                pcie_device = list_first_entry(&ioc->pcie_device_init_list,
                                struct _pcie_device, list);
                pcie_device_get(pcie_device);
        }
        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);

        return pcie_device;
}

/**
 * pcie_device_make_active - Add pcie device to pcie_device_list list
 * @ioc: per adapter object
 * @pcie_device: pcie device object
 *
 * Add the pcie device which has registered with SCSI Transport Later to
 * pcie_device_list list
 */
static void pcie_device_make_active(struct MPT3SAS_ADAPTER *ioc,
                struct _pcie_device *pcie_device)
{
        unsigned long flags;

        spin_lock_irqsave(&ioc->pcie_device_lock, flags);

        if (!list_empty(&pcie_device->list)) {
                list_del_init(&pcie_device->list);
                pcie_device_put(pcie_device);
        }
        pcie_device_get(pcie_device);
        list_add_tail(&pcie_device->list, &ioc->pcie_device_list);

        spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
}

/**
 * _scsih_probe_pcie - reporting PCIe devices to scsi-ml
 * @ioc: per adapter object
 *
 * Called during initial loading of the driver.
 */
static void
_scsih_probe_pcie(struct MPT3SAS_ADAPTER *ioc)
{
        struct _pcie_device *pcie_device;
        int rc;

        /* PCIe Device List */
        while ((pcie_device = get_next_pcie_device(ioc))) {
                if (pcie_device->starget) {
                        pcie_device_put(pcie_device);
                        continue;
                }
                rc = scsi_add_device(ioc->shost, PCIE_CHANNEL,
                        pcie_device->id, 0);
                if (rc) {
                        _scsih_pcie_device_remove(ioc, pcie_device);
                        pcie_device_put(pcie_device);
                        continue;
                } else if (!pcie_device->starget) {
                        /*
                         * When async scanning is enabled, its not possible to
                         * remove devices while scanning is turned on due to an
                         * oops in scsi_sysfs_add_sdev()->add_device()->
                         * sysfs_addrm_start()
                         */
                        if (!ioc->is_driver_loading) {
                        /* TODO-- Need to find out whether this condition will
                         * occur or not
                         */
                                _scsih_pcie_device_remove(ioc, pcie_device);
                                pcie_device_put(pcie_device);
                                continue;
                        }
                }
                pcie_device_make_active(ioc, pcie_device);
                pcie_device_put(pcie_device);
        }
}

/**
 * _scsih_probe_devices - probing for devices
 * @ioc: per adapter object
 *
 * Called during initial loading of the driver.
 */
static void
_scsih_probe_devices(struct MPT3SAS_ADAPTER *ioc)
{
        u16 volume_mapping_flags;

        if (!(ioc->facts.ProtocolFlags & MPI2_IOCFACTS_PROTOCOL_SCSI_INITIATOR))
                return;  /* return when IOC doesn't support initiator mode */

        _scsih_probe_boot_devices(ioc);

        if (ioc->ir_firmware) {
                volume_mapping_flags =
                    le16_to_cpu(ioc->ioc_pg8.IRVolumeMappingFlags) &
                    MPI2_IOCPAGE8_IRFLAGS_MASK_VOLUME_MAPPING_MODE;
                if (volume_mapping_flags ==
                    MPI2_IOCPAGE8_IRFLAGS_LOW_VOLUME_MAPPING) {
                        _scsih_probe_raid(ioc);
                        _scsih_probe_sas(ioc);
                } else {
                        _scsih_probe_sas(ioc);
                        _scsih_probe_raid(ioc);
                }
        } else {
                _scsih_probe_sas(ioc);
                _scsih_probe_pcie(ioc);
        }
}

/**
 * scsih_scan_start - scsi lld callback for .scan_start
 * @shost: SCSI host pointer
 *
 * The shost has the ability to discover targets on its own instead
 * of scanning the entire bus.  In our implemention, we will kick off
 * firmware discovery.
 */
static void
scsih_scan_start(struct Scsi_Host *shost)
{
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        int rc;
        if (diag_buffer_enable != -1 && diag_buffer_enable != 0)
                mpt3sas_enable_diag_buffer(ioc, diag_buffer_enable);

        if (disable_discovery > 0)
                return;

        ioc->start_scan = 1;
        rc = mpt3sas_port_enable(ioc);

        if (rc != 0)
                pr_info(MPT3SAS_FMT "port enable: FAILED\n", ioc->name);
}

/**
 * scsih_scan_finished - scsi lld callback for .scan_finished
 * @shost: SCSI host pointer
 * @time: elapsed time of the scan in jiffies
 *
 * This function will be called periodicallyn until it returns 1 with the
 * scsi_host and the elapsed time of the scan in jiffies. In our implemention,
 * we wait for firmware discovery to complete, then return 1.
 */
static int
scsih_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);

        if (disable_discovery > 0) {
                ioc->is_driver_loading = 0;
                ioc->wait_for_discovery_to_complete = 0;
                return 1;
        }

        if (time >= (300 * HZ)) {
                ioc->port_enable_cmds.status = MPT3_CMD_NOT_USED;
                pr_info(MPT3SAS_FMT
                        "port enable: FAILED with timeout (timeout=300s)\n",
                        ioc->name);
                ioc->is_driver_loading = 0;
                return 1;
        }

        if (ioc->start_scan)
                return 0;

        if (ioc->start_scan_failed) {
                pr_info(MPT3SAS_FMT
                        "port enable: FAILED with (ioc_status=0x%08x)\n",
                        ioc->name, ioc->start_scan_failed);
                ioc->is_driver_loading = 0;
                ioc->wait_for_discovery_to_complete = 0;
                ioc->remove_host = 1;
                return 1;
        }

        pr_info(MPT3SAS_FMT "port enable: SUCCESS\n", ioc->name);
        ioc->port_enable_cmds.status = MPT3_CMD_NOT_USED;

        if (ioc->wait_for_discovery_to_complete) {
                ioc->wait_for_discovery_to_complete = 0;
                _scsih_probe_devices(ioc);
        }
        mpt3sas_base_start_watchdog(ioc);
        ioc->is_driver_loading = 0;
        return 1;
}

/* shost template for SAS 2.0 HBA devices */
static struct scsi_host_template mpt2sas_driver_template = {
        .module                         = THIS_MODULE,
        .name                           = "Fusion MPT SAS Host",
        .proc_name                      = MPT2SAS_DRIVER_NAME,
        .queuecommand                   = scsih_qcmd,
        .target_alloc                   = scsih_target_alloc,
        .slave_alloc                    = scsih_slave_alloc,
        .slave_configure                = scsih_slave_configure,
        .target_destroy                 = scsih_target_destroy,
        .slave_destroy                  = scsih_slave_destroy,
        .scan_finished                  = scsih_scan_finished,
        .scan_start                     = scsih_scan_start,
        .change_queue_depth             = scsih_change_queue_depth,
        .eh_abort_handler               = scsih_abort,
        .eh_device_reset_handler        = scsih_dev_reset,
        .eh_target_reset_handler        = scsih_target_reset,
        .eh_host_reset_handler          = scsih_host_reset,
        .bios_param                     = scsih_bios_param,
        .can_queue                      = 1,
        .this_id                        = -1,
        .sg_tablesize                   = MPT2SAS_SG_DEPTH,
        .max_sectors                    = 32767,
        .cmd_per_lun                    = 7,
        .use_clustering                 = ENABLE_CLUSTERING,
        .shost_attrs                    = mpt3sas_host_attrs,
        .sdev_attrs                     = mpt3sas_dev_attrs,
        .track_queue_depth              = 1,
        .cmd_size                       = sizeof(struct scsiio_tracker),
};

/* raid transport support for SAS 2.0 HBA devices */
static struct raid_function_template mpt2sas_raid_functions = {
        .cookie         = &mpt2sas_driver_template,
        .is_raid        = scsih_is_raid,
        .get_resync     = scsih_get_resync,
        .get_state      = scsih_get_state,
};

/* shost template for SAS 3.0 HBA devices */
static struct scsi_host_template mpt3sas_driver_template = {
        .module                         = THIS_MODULE,
        .name                           = "Fusion MPT SAS Host",
        .proc_name                      = MPT3SAS_DRIVER_NAME,
        .queuecommand                   = scsih_qcmd,
        .target_alloc                   = scsih_target_alloc,
        .slave_alloc                    = scsih_slave_alloc,
        .slave_configure                = scsih_slave_configure,
        .target_destroy                 = scsih_target_destroy,
        .slave_destroy                  = scsih_slave_destroy,
        .scan_finished                  = scsih_scan_finished,
        .scan_start                     = scsih_scan_start,
        .change_queue_depth             = scsih_change_queue_depth,
        .eh_abort_handler               = scsih_abort,
        .eh_device_reset_handler        = scsih_dev_reset,
        .eh_target_reset_handler        = scsih_target_reset,
        .eh_host_reset_handler          = scsih_host_reset,
        .bios_param                     = scsih_bios_param,
        .can_queue                      = 1,
        .this_id                        = -1,
        .sg_tablesize                   = MPT3SAS_SG_DEPTH,
        .max_sectors                    = 32767,
        .cmd_per_lun                    = 7,
        .use_clustering                 = ENABLE_CLUSTERING,
        .shost_attrs                    = mpt3sas_host_attrs,
        .sdev_attrs                     = mpt3sas_dev_attrs,
        .track_queue_depth              = 1,
        .cmd_size                       = sizeof(struct scsiio_tracker),
};

/* raid transport support for SAS 3.0 HBA devices */
static struct raid_function_template mpt3sas_raid_functions = {
        .cookie         = &mpt3sas_driver_template,
        .is_raid        = scsih_is_raid,
        .get_resync     = scsih_get_resync,
        .get_state      = scsih_get_state,
};

/**
 * _scsih_determine_hba_mpi_version - determine in which MPI version class
 *                                      this device belongs to.
 * @pdev: PCI device struct
 *
 * return MPI2_VERSION for SAS 2.0 HBA devices,
 *      MPI25_VERSION for SAS 3.0 HBA devices, and
 *      MPI26 VERSION for Cutlass & Invader SAS 3.0 HBA devices
 */
static u16
_scsih_determine_hba_mpi_version(struct pci_dev *pdev)
{

        switch (pdev->device) {
        case MPI2_MFGPAGE_DEVID_SSS6200:
        case MPI2_MFGPAGE_DEVID_SAS2004:
        case MPI2_MFGPAGE_DEVID_SAS2008:
        case MPI2_MFGPAGE_DEVID_SAS2108_1:
        case MPI2_MFGPAGE_DEVID_SAS2108_2:
        case MPI2_MFGPAGE_DEVID_SAS2108_3:
        case MPI2_MFGPAGE_DEVID_SAS2116_1:
        case MPI2_MFGPAGE_DEVID_SAS2116_2:
        case MPI2_MFGPAGE_DEVID_SAS2208_1:
        case MPI2_MFGPAGE_DEVID_SAS2208_2:
        case MPI2_MFGPAGE_DEVID_SAS2208_3:
        case MPI2_MFGPAGE_DEVID_SAS2208_4:
        case MPI2_MFGPAGE_DEVID_SAS2208_5:
        case MPI2_MFGPAGE_DEVID_SAS2208_6:
        case MPI2_MFGPAGE_DEVID_SAS2308_1:
        case MPI2_MFGPAGE_DEVID_SAS2308_2:
        case MPI2_MFGPAGE_DEVID_SAS2308_3:
        case MPI2_MFGPAGE_DEVID_SAS2308_MPI_EP:
                return MPI2_VERSION;
        case MPI25_MFGPAGE_DEVID_SAS3004:
        case MPI25_MFGPAGE_DEVID_SAS3008:
        case MPI25_MFGPAGE_DEVID_SAS3108_1:
        case MPI25_MFGPAGE_DEVID_SAS3108_2:
        case MPI25_MFGPAGE_DEVID_SAS3108_5:
        case MPI25_MFGPAGE_DEVID_SAS3108_6:
                return MPI25_VERSION;
        case MPI26_MFGPAGE_DEVID_SAS3216:
        case MPI26_MFGPAGE_DEVID_SAS3224:
        case MPI26_MFGPAGE_DEVID_SAS3316_1:
        case MPI26_MFGPAGE_DEVID_SAS3316_2:
        case MPI26_MFGPAGE_DEVID_SAS3316_3:
        case MPI26_MFGPAGE_DEVID_SAS3316_4:
        case MPI26_MFGPAGE_DEVID_SAS3324_1:
        case MPI26_MFGPAGE_DEVID_SAS3324_2:
        case MPI26_MFGPAGE_DEVID_SAS3324_3:
        case MPI26_MFGPAGE_DEVID_SAS3324_4:
        case MPI26_MFGPAGE_DEVID_SAS3508:
        case MPI26_MFGPAGE_DEVID_SAS3508_1:
        case MPI26_MFGPAGE_DEVID_SAS3408:
        case MPI26_MFGPAGE_DEVID_SAS3516:
        case MPI26_MFGPAGE_DEVID_SAS3516_1:
        case MPI26_MFGPAGE_DEVID_SAS3416:
        case MPI26_MFGPAGE_DEVID_SAS3616:
                return MPI26_VERSION;
        }
        return 0;
}

/**
 * _scsih_probe - attach and add scsi host
 * @pdev: PCI device struct
 * @id: pci device id
 *
 * Return: 0 success, anything else error.
 */
static int
_scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
        struct MPT3SAS_ADAPTER *ioc;
        struct Scsi_Host *shost = NULL;
        int rv;
        u16 hba_mpi_version;

        /* Determine in which MPI version class this pci device belongs */
        hba_mpi_version = _scsih_determine_hba_mpi_version(pdev);
        if (hba_mpi_version == 0)
                return -ENODEV;

        /* Enumerate only SAS 2.0 HBA's if hbas_to_enumerate is one,
         * for other generation HBA's return with -ENODEV
         */
        if ((hbas_to_enumerate == 1) && (hba_mpi_version !=  MPI2_VERSION))
                return -ENODEV;

        /* Enumerate only SAS 3.0 HBA's if hbas_to_enumerate is two,
         * for other generation HBA's return with -ENODEV
         */
        if ((hbas_to_enumerate == 2) && (!(hba_mpi_version ==  MPI25_VERSION
                || hba_mpi_version ==  MPI26_VERSION)))
                return -ENODEV;

        switch (hba_mpi_version) {
        case MPI2_VERSION:
                pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
                        PCIE_LINK_STATE_L1 | PCIE_LINK_STATE_CLKPM);
                /* Use mpt2sas driver host template for SAS 2.0 HBA's */
                shost = scsi_host_alloc(&mpt2sas_driver_template,
                  sizeof(struct MPT3SAS_ADAPTER));
                if (!shost)
                        return -ENODEV;
                ioc = shost_priv(shost);
                memset(ioc, 0, sizeof(struct MPT3SAS_ADAPTER));
                ioc->hba_mpi_version_belonged = hba_mpi_version;
                ioc->id = mpt2_ids++;
                sprintf(ioc->driver_name, "%s", MPT2SAS_DRIVER_NAME);
                switch (pdev->device) {
                case MPI2_MFGPAGE_DEVID_SSS6200:
                        ioc->is_warpdrive = 1;
                        ioc->hide_ir_msg = 1;
                        break;
                case MPI2_MFGPAGE_DEVID_SAS2308_MPI_EP:
                        ioc->is_mcpu_endpoint = 1;
                        break;
                default:
                        ioc->mfg_pg10_hide_flag = MFG_PAGE10_EXPOSE_ALL_DISKS;
                        break;
                }
                break;
        case MPI25_VERSION:
        case MPI26_VERSION:
                /* Use mpt3sas driver host template for SAS 3.0 HBA's */
                shost = scsi_host_alloc(&mpt3sas_driver_template,
                  sizeof(struct MPT3SAS_ADAPTER));
                if (!shost)
                        return -ENODEV;
                ioc = shost_priv(shost);
                memset(ioc, 0, sizeof(struct MPT3SAS_ADAPTER));
                ioc->hba_mpi_version_belonged = hba_mpi_version;
                ioc->id = mpt3_ids++;
                sprintf(ioc->driver_name, "%s", MPT3SAS_DRIVER_NAME);
                switch (pdev->device) {
                case MPI26_MFGPAGE_DEVID_SAS3508:
                case MPI26_MFGPAGE_DEVID_SAS3508_1:
                case MPI26_MFGPAGE_DEVID_SAS3408:
                case MPI26_MFGPAGE_DEVID_SAS3516:
                case MPI26_MFGPAGE_DEVID_SAS3516_1:
                case MPI26_MFGPAGE_DEVID_SAS3416:
                case MPI26_MFGPAGE_DEVID_SAS3616:
                        ioc->is_gen35_ioc = 1;
                        break;
                default:
                        ioc->is_gen35_ioc = 0;
                }
                if ((ioc->hba_mpi_version_belonged == MPI25_VERSION &&
                        pdev->revision >= SAS3_PCI_DEVICE_C0_REVISION) ||
                        (ioc->hba_mpi_version_belonged == MPI26_VERSION)) {
                        ioc->combined_reply_queue = 1;
                        if (ioc->is_gen35_ioc)
                                ioc->combined_reply_index_count =
                                 MPT3_SUP_REPLY_POST_HOST_INDEX_REG_COUNT_G35;
                        else
                                ioc->combined_reply_index_count =
                                 MPT3_SUP_REPLY_POST_HOST_INDEX_REG_COUNT_G3;
                }
                break;
        default:
                return -ENODEV;
        }

        INIT_LIST_HEAD(&ioc->list);
        spin_lock(&gioc_lock);
        list_add_tail(&ioc->list, &mpt3sas_ioc_list);
        spin_unlock(&gioc_lock);
        ioc->shost = shost;
        ioc->pdev = pdev;
        ioc->scsi_io_cb_idx = scsi_io_cb_idx;
        ioc->tm_cb_idx = tm_cb_idx;
        ioc->ctl_cb_idx = ctl_cb_idx;
        ioc->base_cb_idx = base_cb_idx;
        ioc->port_enable_cb_idx = port_enable_cb_idx;
        ioc->transport_cb_idx = transport_cb_idx;
        ioc->scsih_cb_idx = scsih_cb_idx;
        ioc->config_cb_idx = config_cb_idx;
        ioc->tm_tr_cb_idx = tm_tr_cb_idx;
        ioc->tm_tr_volume_cb_idx = tm_tr_volume_cb_idx;
        ioc->tm_sas_control_cb_idx = tm_sas_control_cb_idx;
        ioc->logging_level = logging_level;
        ioc->schedule_dead_ioc_flush_running_cmds = &_scsih_flush_running_cmds;
        /* misc semaphores and spin locks */
        mutex_init(&ioc->reset_in_progress_mutex);
        /* initializing pci_access_mutex lock */
        mutex_init(&ioc->pci_access_mutex);
        spin_lock_init(&ioc->ioc_reset_in_progress_lock);
        spin_lock_init(&ioc->scsi_lookup_lock);
        spin_lock_init(&ioc->sas_device_lock);
        spin_lock_init(&ioc->sas_node_lock);
        spin_lock_init(&ioc->fw_event_lock);
        spin_lock_init(&ioc->raid_device_lock);
        spin_lock_init(&ioc->pcie_device_lock);
        spin_lock_init(&ioc->diag_trigger_lock);

        INIT_LIST_HEAD(&ioc->sas_device_list);
        INIT_LIST_HEAD(&ioc->sas_device_init_list);
        INIT_LIST_HEAD(&ioc->sas_expander_list);
        INIT_LIST_HEAD(&ioc->enclosure_list);
        INIT_LIST_HEAD(&ioc->pcie_device_list);
        INIT_LIST_HEAD(&ioc->pcie_device_init_list);
        INIT_LIST_HEAD(&ioc->fw_event_list);
        INIT_LIST_HEAD(&ioc->raid_device_list);
        INIT_LIST_HEAD(&ioc->sas_hba.sas_port_list);
        INIT_LIST_HEAD(&ioc->delayed_tr_list);
        INIT_LIST_HEAD(&ioc->delayed_sc_list);
        INIT_LIST_HEAD(&ioc->delayed_event_ack_list);
        INIT_LIST_HEAD(&ioc->delayed_tr_volume_list);
        INIT_LIST_HEAD(&ioc->reply_queue_list);

        sprintf(ioc->name, "%s_cm%d", ioc->driver_name, ioc->id);

        /* init shost parameters */
        shost->max_cmd_len = 32;
        shost->max_lun = max_lun;
        shost->transportt = mpt3sas_transport_template;
        shost->unique_id = ioc->id;

        if (ioc->is_mcpu_endpoint) {
                /* mCPU MPI support 64K max IO */
                shost->max_sectors = 128;
                pr_info(MPT3SAS_FMT
                                "The max_sectors value is set to %d\n",
                                ioc->name, shost->max_sectors);
        } else {
                if (max_sectors != 0xFFFF) {
                        if (max_sectors < 64) {
                                shost->max_sectors = 64;
                                pr_warn(MPT3SAS_FMT "Invalid value %d passed " \
                                    "for max_sectors, range is 64 to 32767. " \
                                    "Assigning value of 64.\n", \
                                    ioc->name, max_sectors);
                        } else if (max_sectors > 32767) {
                                shost->max_sectors = 32767;
                                pr_warn(MPT3SAS_FMT "Invalid value %d passed " \
                                    "for max_sectors, range is 64 to 32767." \
                                    "Assigning default value of 32767.\n", \
                                    ioc->name, max_sectors);
                        } else {
                                shost->max_sectors = max_sectors & 0xFFFE;
                                pr_info(MPT3SAS_FMT
                                        "The max_sectors value is set to %d\n",
                                        ioc->name, shost->max_sectors);
                        }
                }
        }
        /* register EEDP capabilities with SCSI layer */
        if (prot_mask > 0)
                scsi_host_set_prot(shost, prot_mask);
        else
                scsi_host_set_prot(shost, SHOST_DIF_TYPE1_PROTECTION
                                   | SHOST_DIF_TYPE2_PROTECTION
                                   | SHOST_DIF_TYPE3_PROTECTION);

        scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);

        /* event thread */
        snprintf(ioc->firmware_event_name, sizeof(ioc->firmware_event_name),
            "fw_event_%s%d", ioc->driver_name, ioc->id);
        ioc->firmware_event_thread = alloc_ordered_workqueue(
            ioc->firmware_event_name, 0);
        if (!ioc->firmware_event_thread) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rv = -ENODEV;
                goto out_thread_fail;
        }

        ioc->is_driver_loading = 1;
        if ((mpt3sas_base_attach(ioc))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rv = -ENODEV;
                goto out_attach_fail;
        }

        if (ioc->is_warpdrive) {
                if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_EXPOSE_ALL_DISKS)
                        ioc->hide_drives = 0;
                else if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_HIDE_ALL_DISKS)
                        ioc->hide_drives = 1;
                else {
                        if (mpt3sas_get_num_volumes(ioc))
                                ioc->hide_drives = 1;
                        else
                                ioc->hide_drives = 0;
                }
        } else
                ioc->hide_drives = 0;

        rv = scsi_add_host(shost, &pdev->dev);
        if (rv) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out_add_shost_fail;
        }

        scsi_scan_host(shost);
        return 0;
out_add_shost_fail:
        mpt3sas_base_detach(ioc);
 out_attach_fail:
        destroy_workqueue(ioc->firmware_event_thread);
 out_thread_fail:
        spin_lock(&gioc_lock);
        list_del(&ioc->list);
        spin_unlock(&gioc_lock);
        scsi_host_put(shost);
        return rv;
}

#ifdef CONFIG_PM
/**
 * scsih_suspend - power management suspend main entry point
 * @pdev: PCI device struct
 * @state: PM state change to (usually PCI_D3)
 *
 * Return: 0 success, anything else error.
 */
static int
scsih_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct Scsi_Host *shost = pci_get_drvdata(pdev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        pci_power_t device_state;

        mpt3sas_base_stop_watchdog(ioc);
        flush_scheduled_work();
        scsi_block_requests(shost);
        device_state = pci_choose_state(pdev, state);
        pr_info(MPT3SAS_FMT
                "pdev=0x%p, slot=%s, entering operating state [D%d]\n",
                ioc->name, pdev, pci_name(pdev), device_state);

        pci_save_state(pdev);
        mpt3sas_base_free_resources(ioc);
        pci_set_power_state(pdev, device_state);
        return 0;
}

/**
 * scsih_resume - power management resume main entry point
 * @pdev: PCI device struct
 *
 * Return: 0 success, anything else error.
 */
static int
scsih_resume(struct pci_dev *pdev)
{
        struct Scsi_Host *shost = pci_get_drvdata(pdev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        pci_power_t device_state = pdev->current_state;
        int r;

        pr_info(MPT3SAS_FMT
                "pdev=0x%p, slot=%s, previous operating state [D%d]\n",
                ioc->name, pdev, pci_name(pdev), device_state);

        pci_set_power_state(pdev, PCI_D0);
        pci_enable_wake(pdev, PCI_D0, 0);
        pci_restore_state(pdev);
        ioc->pdev = pdev;
        r = mpt3sas_base_map_resources(ioc);
        if (r)
                return r;

        mpt3sas_base_hard_reset_handler(ioc, SOFT_RESET);
        scsi_unblock_requests(shost);
        mpt3sas_base_start_watchdog(ioc);
        return 0;
}
#endif /* CONFIG_PM */

/**
 * scsih_pci_error_detected - Called when a PCI error is detected.
 * @pdev: PCI device struct
 * @state: PCI channel state
 *
 * Description: Called when a PCI error is detected.
 *
 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT.
 */
static pci_ers_result_t
scsih_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
{
        struct Scsi_Host *shost = pci_get_drvdata(pdev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);

        pr_info(MPT3SAS_FMT "PCI error: detected callback, state(%d)!!\n",
            ioc->name, state);

        switch (state) {
        case pci_channel_io_normal:
                return PCI_ERS_RESULT_CAN_RECOVER;
        case pci_channel_io_frozen:
                /* Fatal error, prepare for slot reset */
                ioc->pci_error_recovery = 1;
                scsi_block_requests(ioc->shost);
                mpt3sas_base_stop_watchdog(ioc);
                mpt3sas_base_free_resources(ioc);
                return PCI_ERS_RESULT_NEED_RESET;
        case pci_channel_io_perm_failure:
                /* Permanent error, prepare for device removal */
                ioc->pci_error_recovery = 1;
                mpt3sas_base_stop_watchdog(ioc);
                _scsih_flush_running_cmds(ioc);
                return PCI_ERS_RESULT_DISCONNECT;
        }
        return PCI_ERS_RESULT_NEED_RESET;
}

/**
 * scsih_pci_slot_reset - Called when PCI slot has been reset.
 * @pdev: PCI device struct
 *
 * Description: This routine is called by the pci error recovery
 * code after the PCI slot has been reset, just before we
 * should resume normal operations.
 */
static pci_ers_result_t
scsih_pci_slot_reset(struct pci_dev *pdev)
{
        struct Scsi_Host *shost = pci_get_drvdata(pdev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        int rc;

        pr_info(MPT3SAS_FMT "PCI error: slot reset callback!!\n",
             ioc->name);

        ioc->pci_error_recovery = 0;
        ioc->pdev = pdev;
        pci_restore_state(pdev);
        rc = mpt3sas_base_map_resources(ioc);
        if (rc)
                return PCI_ERS_RESULT_DISCONNECT;

        rc = mpt3sas_base_hard_reset_handler(ioc, FORCE_BIG_HAMMER);

        pr_warn(MPT3SAS_FMT "hard reset: %s\n", ioc->name,
            (rc == 0) ? "success" : "failed");

        if (!rc)
                return PCI_ERS_RESULT_RECOVERED;
        else
                return PCI_ERS_RESULT_DISCONNECT;
}

/**
 * scsih_pci_resume() - resume normal ops after PCI reset
 * @pdev: pointer to PCI device
 *
 * Called when the error recovery driver tells us that its
 * OK to resume normal operation. Use completion to allow
 * halted scsi ops to resume.
 */
static void
scsih_pci_resume(struct pci_dev *pdev)
{
        struct Scsi_Host *shost = pci_get_drvdata(pdev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);

        pr_info(MPT3SAS_FMT "PCI error: resume callback!!\n", ioc->name);

        pci_cleanup_aer_uncorrect_error_status(pdev);
        mpt3sas_base_start_watchdog(ioc);
        scsi_unblock_requests(ioc->shost);
}

/**
 * scsih_pci_mmio_enabled - Enable MMIO and dump debug registers
 * @pdev: pointer to PCI device
 */
static pci_ers_result_t
scsih_pci_mmio_enabled(struct pci_dev *pdev)
{
        struct Scsi_Host *shost = pci_get_drvdata(pdev);
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);

        pr_info(MPT3SAS_FMT "PCI error: mmio enabled callback!!\n",
            ioc->name);

        /* TODO - dump whatever for debugging purposes */

        /* This called only if scsih_pci_error_detected returns
         * PCI_ERS_RESULT_CAN_RECOVER. Read/write to the device still
         * works, no need to reset slot.
         */
        return PCI_ERS_RESULT_RECOVERED;
}

/**
 * scsih__ncq_prio_supp - Check for NCQ command priority support
 * @sdev: scsi device struct
 *
 * This is called when a user indicates they would like to enable
 * ncq command priorities. This works only on SATA devices.
 */
bool scsih_ncq_prio_supp(struct scsi_device *sdev)
{
        unsigned char *buf;
        bool ncq_prio_supp = false;

        if (!scsi_device_supports_vpd(sdev))
                return ncq_prio_supp;

        buf = kmalloc(SCSI_VPD_PG_LEN, GFP_KERNEL);
        if (!buf)
                return ncq_prio_supp;

        if (!scsi_get_vpd_page(sdev, 0x89, buf, SCSI_VPD_PG_LEN))
                ncq_prio_supp = (buf[213] >> 4) & 1;

        kfree(buf);
        return ncq_prio_supp;
}
/*
 * The pci device ids are defined in mpi/mpi2_cnfg.h.
 */
static const struct pci_device_id mpt3sas_pci_table[] = {
        /* Spitfire ~ 2004 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2004,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Falcon ~ 2008 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2008,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Liberator ~ 2108 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2108_1,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2108_2,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2108_3,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Meteor ~ 2116 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2116_1,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2116_2,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Thunderbolt ~ 2208 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_1,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_2,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_3,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_4,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_5,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_6,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Mustang ~ 2308 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2308_1,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2308_2,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2308_3,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2308_MPI_EP,
                PCI_ANY_ID, PCI_ANY_ID },
        /* SSS6200 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SSS6200,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Fury ~ 3004 and 3008 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI25_MFGPAGE_DEVID_SAS3004,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI25_MFGPAGE_DEVID_SAS3008,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Invader ~ 3108 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI25_MFGPAGE_DEVID_SAS3108_1,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI25_MFGPAGE_DEVID_SAS3108_2,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI25_MFGPAGE_DEVID_SAS3108_5,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI25_MFGPAGE_DEVID_SAS3108_6,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Cutlass ~ 3216 and 3224 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3216,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3224,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Intruder ~ 3316 and 3324 */
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3316_1,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3316_2,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3316_3,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3316_4,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3324_1,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3324_2,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3324_3,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3324_4,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Ventura, Crusader, Harpoon & Tomcat ~ 3516, 3416, 3508 & 3408*/
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3508,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3508_1,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3408,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3516,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3516_1,
                PCI_ANY_ID, PCI_ANY_ID },
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3416,
                PCI_ANY_ID, PCI_ANY_ID },
        /* Mercator ~ 3616*/
        { MPI2_MFGPAGE_VENDORID_LSI, MPI26_MFGPAGE_DEVID_SAS3616,
                PCI_ANY_ID, PCI_ANY_ID },
        {0}     /* Terminating entry */
};
MODULE_DEVICE_TABLE(pci, mpt3sas_pci_table);

static struct pci_error_handlers _mpt3sas_err_handler = {
        .error_detected = scsih_pci_error_detected,
        .mmio_enabled   = scsih_pci_mmio_enabled,
        .slot_reset     = scsih_pci_slot_reset,
        .resume         = scsih_pci_resume,
};

static struct pci_driver mpt3sas_driver = {
        .name           = MPT3SAS_DRIVER_NAME,
        .id_table       = mpt3sas_pci_table,
        .probe          = _scsih_probe,
        .remove         = scsih_remove,
        .shutdown       = scsih_shutdown,
        .err_handler    = &_mpt3sas_err_handler,
#ifdef CONFIG_PM
        .suspend        = scsih_suspend,
        .resume         = scsih_resume,
#endif
};

/**
 * scsih_init - main entry point for this driver.
 *
 * Return: 0 success, anything else error.
 */
static int
scsih_init(void)
{
        mpt2_ids = 0;
        mpt3_ids = 0;

        mpt3sas_base_initialize_callback_handler();

         /* queuecommand callback hander */
        scsi_io_cb_idx = mpt3sas_base_register_callback_handler(_scsih_io_done);

        /* task management callback handler */
        tm_cb_idx = mpt3sas_base_register_callback_handler(_scsih_tm_done);

        /* base internal commands callback handler */
        base_cb_idx = mpt3sas_base_register_callback_handler(mpt3sas_base_done);
        port_enable_cb_idx = mpt3sas_base_register_callback_handler(
            mpt3sas_port_enable_done);

        /* transport internal commands callback handler */
        transport_cb_idx = mpt3sas_base_register_callback_handler(
            mpt3sas_transport_done);

        /* scsih internal commands callback handler */
        scsih_cb_idx = mpt3sas_base_register_callback_handler(_scsih_done);

        /* configuration page API internal commands callback handler */
        config_cb_idx = mpt3sas_base_register_callback_handler(
            mpt3sas_config_done);

        /* ctl module callback handler */
        ctl_cb_idx = mpt3sas_base_register_callback_handler(mpt3sas_ctl_done);

        tm_tr_cb_idx = mpt3sas_base_register_callback_handler(
            _scsih_tm_tr_complete);

        tm_tr_volume_cb_idx = mpt3sas_base_register_callback_handler(
            _scsih_tm_volume_tr_complete);

        tm_sas_control_cb_idx = mpt3sas_base_register_callback_handler(
            _scsih_sas_control_complete);

        return 0;
}

/**
 * scsih_exit - exit point for this driver (when it is a module).
 *
 * Return: 0 success, anything else error.
 */
static void
scsih_exit(void)
{

        mpt3sas_base_release_callback_handler(scsi_io_cb_idx);
        mpt3sas_base_release_callback_handler(tm_cb_idx);
        mpt3sas_base_release_callback_handler(base_cb_idx);
        mpt3sas_base_release_callback_handler(port_enable_cb_idx);
        mpt3sas_base_release_callback_handler(transport_cb_idx);
        mpt3sas_base_release_callback_handler(scsih_cb_idx);
        mpt3sas_base_release_callback_handler(config_cb_idx);
        mpt3sas_base_release_callback_handler(ctl_cb_idx);

        mpt3sas_base_release_callback_handler(tm_tr_cb_idx);
        mpt3sas_base_release_callback_handler(tm_tr_volume_cb_idx);
        mpt3sas_base_release_callback_handler(tm_sas_control_cb_idx);

/* raid transport support */
        if (hbas_to_enumerate != 1)
                raid_class_release(mpt3sas_raid_template);
        if (hbas_to_enumerate != 2)
                raid_class_release(mpt2sas_raid_template);
        sas_release_transport(mpt3sas_transport_template);
}

/**
 * _mpt3sas_init - main entry point for this driver.
 *
 * Return: 0 success, anything else error.
 */
static int __init
_mpt3sas_init(void)
{
        int error;

        pr_info("%s version %s loaded\n", MPT3SAS_DRIVER_NAME,
                                        MPT3SAS_DRIVER_VERSION);

        mpt3sas_transport_template =
            sas_attach_transport(&mpt3sas_transport_functions);
        if (!mpt3sas_transport_template)
                return -ENODEV;

        /* No need attach mpt3sas raid functions template
         * if hbas_to_enumarate value is one.
         */
        if (hbas_to_enumerate != 1) {
                mpt3sas_raid_template =
                                raid_class_attach(&mpt3sas_raid_functions);
                if (!mpt3sas_raid_template) {
                        sas_release_transport(mpt3sas_transport_template);
                        return -ENODEV;
                }
        }

        /* No need to attach mpt2sas raid functions template
         * if hbas_to_enumarate value is two
         */
        if (hbas_to_enumerate != 2) {
                mpt2sas_raid_template =
                                raid_class_attach(&mpt2sas_raid_functions);
                if (!mpt2sas_raid_template) {
                        sas_release_transport(mpt3sas_transport_template);
                        return -ENODEV;
                }
        }

        error = scsih_init();
        if (error) {
                scsih_exit();
                return error;
        }

        mpt3sas_ctl_init(hbas_to_enumerate);

        error = pci_register_driver(&mpt3sas_driver);
        if (error)
                scsih_exit();

        return error;
}

/**
 * _mpt3sas_exit - exit point for this driver (when it is a module).
 *
 */
static void __exit
_mpt3sas_exit(void)
{
        pr_info("mpt3sas version %s unloading\n",
                                MPT3SAS_DRIVER_VERSION);

        mpt3sas_ctl_exit(hbas_to_enumerate);

        pci_unregister_driver(&mpt3sas_driver);

        scsih_exit();
}

module_init(_mpt3sas_init);
module_exit(_mpt3sas_exit);