tcp: fix lockdep splat in tcp_snd_una_update()

[linux/fpc-iii.git] / drivers / scsi / pm8001 / pm8001_ctl.c

/*
 * PMC-Sierra 8001/8081/8088/8089 SAS/SATA based host adapters driver
 *
 * Copyright (c) 2008-2009 USI Co., Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * 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 OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 */
#include <linux/firmware.h>
#include <linux/slab.h>
#include "pm8001_sas.h"
#include "pm8001_ctl.h"

/* scsi host attributes */

/**
 * pm8001_ctl_mpi_interface_rev_show - MPI interface revision number
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_mpi_interface_rev_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;

        if (pm8001_ha->chip_id == chip_8001) {
                return snprintf(buf, PAGE_SIZE, "%d\n",
                        pm8001_ha->main_cfg_tbl.pm8001_tbl.interface_rev);
        } else {
                return snprintf(buf, PAGE_SIZE, "%d\n",
                        pm8001_ha->main_cfg_tbl.pm80xx_tbl.interface_rev);
        }
}
static
DEVICE_ATTR(interface_rev, S_IRUGO, pm8001_ctl_mpi_interface_rev_show, NULL);

/**
 * pm8001_ctl_fw_version_show - firmware version
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_fw_version_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;

        if (pm8001_ha->chip_id == chip_8001) {
                return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x.%02x\n",
                (u8)(pm8001_ha->main_cfg_tbl.pm8001_tbl.firmware_rev >> 24),
                (u8)(pm8001_ha->main_cfg_tbl.pm8001_tbl.firmware_rev >> 16),
                (u8)(pm8001_ha->main_cfg_tbl.pm8001_tbl.firmware_rev >> 8),
                (u8)(pm8001_ha->main_cfg_tbl.pm8001_tbl.firmware_rev));
        } else {
                return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x.%02x\n",
                (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.firmware_rev >> 24),
                (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.firmware_rev >> 16),
                (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.firmware_rev >> 8),
                (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.firmware_rev));
        }
}
static DEVICE_ATTR(fw_version, S_IRUGO, pm8001_ctl_fw_version_show, NULL);
/**
 * pm8001_ctl_max_out_io_show - max outstanding io supported
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_max_out_io_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;

        if (pm8001_ha->chip_id == chip_8001) {
                return snprintf(buf, PAGE_SIZE, "%d\n",
                        pm8001_ha->main_cfg_tbl.pm8001_tbl.max_out_io);
        } else {
                return snprintf(buf, PAGE_SIZE, "%d\n",
                        pm8001_ha->main_cfg_tbl.pm80xx_tbl.max_out_io);
        }
}
static DEVICE_ATTR(max_out_io, S_IRUGO, pm8001_ctl_max_out_io_show, NULL);
/**
 * pm8001_ctl_max_devices_show - max devices support
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_max_devices_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;

        if (pm8001_ha->chip_id == chip_8001) {
                return snprintf(buf, PAGE_SIZE, "%04d\n",
                        (u16)(pm8001_ha->main_cfg_tbl.pm8001_tbl.max_sgl >> 16)
                        );
        } else {
                return snprintf(buf, PAGE_SIZE, "%04d\n",
                        (u16)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.max_sgl >> 16)
                        );
        }
}
static DEVICE_ATTR(max_devices, S_IRUGO, pm8001_ctl_max_devices_show, NULL);
/**
 * pm8001_ctl_max_sg_list_show - max sg list supported iff not 0.0 for no
 * hardware limitation
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_max_sg_list_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;

        if (pm8001_ha->chip_id == chip_8001) {
                return snprintf(buf, PAGE_SIZE, "%04d\n",
                        pm8001_ha->main_cfg_tbl.pm8001_tbl.max_sgl & 0x0000FFFF
                        );
        } else {
                return snprintf(buf, PAGE_SIZE, "%04d\n",
                        pm8001_ha->main_cfg_tbl.pm80xx_tbl.max_sgl & 0x0000FFFF
                        );
        }
}
static DEVICE_ATTR(max_sg_list, S_IRUGO, pm8001_ctl_max_sg_list_show, NULL);

#define SAS_1_0 0x1
#define SAS_1_1 0x2
#define SAS_2_0 0x4

static ssize_t
show_sas_spec_support_status(unsigned int mode, char *buf)
{
        ssize_t len = 0;

        if (mode & SAS_1_1)
                len = sprintf(buf, "%s", "SAS1.1");
        if (mode & SAS_2_0)
                len += sprintf(buf + len, "%s%s", len ? ", " : "", "SAS2.0");
        len += sprintf(buf + len, "\n");

        return len;
}

/**
 * pm8001_ctl_sas_spec_support_show - sas spec supported
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_sas_spec_support_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        unsigned int mode;
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
        /* fe000000 means supports SAS2.1 */
        if (pm8001_ha->chip_id == chip_8001)
                mode = (pm8001_ha->main_cfg_tbl.pm8001_tbl.ctrl_cap_flag &
                                                        0xfe000000)>>25;
        else
                /* fe000000 means supports SAS2.1 */
                mode = (pm8001_ha->main_cfg_tbl.pm80xx_tbl.ctrl_cap_flag &
                                                        0xfe000000)>>25;
        return show_sas_spec_support_status(mode, buf);
}
static DEVICE_ATTR(sas_spec_support, S_IRUGO,
                   pm8001_ctl_sas_spec_support_show, NULL);

/**
 * pm8001_ctl_sas_address_show - sas address
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * This is the controller sas address
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_host_sas_address_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
        return snprintf(buf, PAGE_SIZE, "0x%016llx\n",
                        be64_to_cpu(*(__be64 *)pm8001_ha->sas_addr));
}
static DEVICE_ATTR(host_sas_address, S_IRUGO,
                   pm8001_ctl_host_sas_address_show, NULL);

/**
 * pm8001_ctl_logging_level_show - logging level
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * A sysfs 'read/write' shost attribute.
 */
static ssize_t pm8001_ctl_logging_level_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;

        return snprintf(buf, PAGE_SIZE, "%08xh\n", pm8001_ha->logging_level);
}
static ssize_t pm8001_ctl_logging_level_store(struct device *cdev,
        struct device_attribute *attr, const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
        int val = 0;

        if (sscanf(buf, "%x", &val) != 1)
                return -EINVAL;

        pm8001_ha->logging_level = val;
        return strlen(buf);
}

static DEVICE_ATTR(logging_level, S_IRUGO | S_IWUSR,
        pm8001_ctl_logging_level_show, pm8001_ctl_logging_level_store);
/**
 * pm8001_ctl_aap_log_show - aap1 event log
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_aap_log_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
        int i;
#define AAP1_MEMMAP(r, c) \
        (*(u32 *)((u8*)pm8001_ha->memoryMap.region[AAP1].virt_ptr + (r) * 32 \
        + (c)))

        char *str = buf;
        int max = 2;
        for (i = 0; i < max; i++) {
                str += sprintf(str, "0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x"
                               "0x%08x 0x%08x\n",
                               AAP1_MEMMAP(i, 0),
                               AAP1_MEMMAP(i, 4),
                               AAP1_MEMMAP(i, 8),
                               AAP1_MEMMAP(i, 12),
                               AAP1_MEMMAP(i, 16),
                               AAP1_MEMMAP(i, 20),
                               AAP1_MEMMAP(i, 24),
                               AAP1_MEMMAP(i, 28));
        }

        return str - buf;
}
static DEVICE_ATTR(aap_log, S_IRUGO, pm8001_ctl_aap_log_show, NULL);
/**
 * pm8001_ctl_ib_queue_log_show - Out bound Queue log
 * @cdev:pointer to embedded class device
 * @buf: the buffer returned
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_ib_queue_log_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
        int offset;
        char *str = buf;
        int start = 0;
#define IB_MEMMAP(c)    \
                (*(u32 *)((u8 *)pm8001_ha->     \
                memoryMap.region[IB].virt_ptr + \
                pm8001_ha->evtlog_ib_offset + (c)))

        for (offset = 0; offset < IB_OB_READ_TIMES; offset++) {
                str += sprintf(str, "0x%08x\n", IB_MEMMAP(start));
                start = start + 4;
        }
        pm8001_ha->evtlog_ib_offset += SYSFS_OFFSET;
        if (((pm8001_ha->evtlog_ib_offset) % (PM80XX_IB_OB_QUEUE_SIZE)) == 0)
                pm8001_ha->evtlog_ib_offset = 0;

        return str - buf;
}

static DEVICE_ATTR(ib_log, S_IRUGO, pm8001_ctl_ib_queue_log_show, NULL);
/**
 * pm8001_ctl_ob_queue_log_show - Out bound Queue log
 * @cdev:pointer to embedded class device
 * @buf: the buffer returned
 * A sysfs 'read-only' shost attribute.
 */

static ssize_t pm8001_ctl_ob_queue_log_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
        int offset;
        char *str = buf;
        int start = 0;
#define OB_MEMMAP(c)    \
                (*(u32 *)((u8 *)pm8001_ha->     \
                memoryMap.region[OB].virt_ptr + \
                pm8001_ha->evtlog_ob_offset + (c)))

        for (offset = 0; offset < IB_OB_READ_TIMES; offset++) {
                str += sprintf(str, "0x%08x\n", OB_MEMMAP(start));
                start = start + 4;
        }
        pm8001_ha->evtlog_ob_offset += SYSFS_OFFSET;
        if (((pm8001_ha->evtlog_ob_offset) % (PM80XX_IB_OB_QUEUE_SIZE)) == 0)
                pm8001_ha->evtlog_ob_offset = 0;

        return str - buf;
}
static DEVICE_ATTR(ob_log, S_IRUGO, pm8001_ctl_ob_queue_log_show, NULL);
/**
 * pm8001_ctl_bios_version_show - Bios version Display
 * @cdev:pointer to embedded class device
 * @buf:the buffer returned
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_bios_version_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
        char *str = buf;
        int bios_index;
        DECLARE_COMPLETION_ONSTACK(completion);
        struct pm8001_ioctl_payload payload;

        pm8001_ha->nvmd_completion = &completion;
        payload.minor_function = 7;
        payload.offset = 0;
        payload.length = 4096;
        payload.func_specific = kzalloc(4096, GFP_KERNEL);
        if (!payload.func_specific)
                return -ENOMEM;
        if (PM8001_CHIP_DISP->get_nvmd_req(pm8001_ha, &payload)) {
                kfree(payload.func_specific);
                return -ENOMEM;
        }
        wait_for_completion(&completion);
        for (bios_index = BIOSOFFSET; bios_index < BIOS_OFFSET_LIMIT;
                bios_index++)
                str += sprintf(str, "%c",
                        *(payload.func_specific+bios_index));
        kfree(payload.func_specific);
        return str - buf;
}
static DEVICE_ATTR(bios_version, S_IRUGO, pm8001_ctl_bios_version_show, NULL);
/**
 * pm8001_ctl_aap_log_show - IOP event log
 * @cdev: pointer to embedded class device
 * @buf: the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t pm8001_ctl_iop_log_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
#define IOP_MEMMAP(r, c) \
        (*(u32 *)((u8*)pm8001_ha->memoryMap.region[IOP].virt_ptr + (r) * 32 \
        + (c)))
        int i;
        char *str = buf;
        int max = 2;
        for (i = 0; i < max; i++) {
                str += sprintf(str, "0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x"
                               "0x%08x 0x%08x\n",
                               IOP_MEMMAP(i, 0),
                               IOP_MEMMAP(i, 4),
                               IOP_MEMMAP(i, 8),
                               IOP_MEMMAP(i, 12),
                               IOP_MEMMAP(i, 16),
                               IOP_MEMMAP(i, 20),
                               IOP_MEMMAP(i, 24),
                               IOP_MEMMAP(i, 28));
        }

        return str - buf;
}
static DEVICE_ATTR(iop_log, S_IRUGO, pm8001_ctl_iop_log_show, NULL);

/**
 ** pm8001_ctl_fatal_log_show - fatal error logging
 ** @cdev:pointer to embedded class device
 ** @buf: the buffer returned
 **
 ** A sysfs 'read-only' shost attribute.
 **/

static ssize_t pm8001_ctl_fatal_log_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        ssize_t count;

        count = pm80xx_get_fatal_dump(cdev, attr, buf);
        return count;
}

static DEVICE_ATTR(fatal_log, S_IRUGO, pm8001_ctl_fatal_log_show, NULL);


/**
 ** pm8001_ctl_gsm_log_show - gsm dump collection
 ** @cdev:pointer to embedded class device
 ** @buf: the buffer returned
 **A sysfs 'read-only' shost attribute.
 **/
static ssize_t pm8001_ctl_gsm_log_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        ssize_t count;

        count = pm8001_get_gsm_dump(cdev, SYSFS_OFFSET, buf);
        return count;
}

static DEVICE_ATTR(gsm_log, S_IRUGO, pm8001_ctl_gsm_log_show, NULL);

#define FLASH_CMD_NONE      0x00
#define FLASH_CMD_UPDATE    0x01
#define FLASH_CMD_SET_NVMD    0x02

struct flash_command {
     u8      command[8];
     int     code;
};

static struct flash_command flash_command_table[] =
{
     {"set_nvmd",    FLASH_CMD_SET_NVMD},
     {"update",      FLASH_CMD_UPDATE},
     {"",            FLASH_CMD_NONE} /* Last entry should be NULL. */
};

struct error_fw {
     char    *reason;
     int     err_code;
};

static struct error_fw flash_error_table[] =
{
     {"Failed to open fw image file",   FAIL_OPEN_BIOS_FILE},
     {"image header mismatch",          FLASH_UPDATE_HDR_ERR},
     {"image offset mismatch",          FLASH_UPDATE_OFFSET_ERR},
     {"image CRC Error",                FLASH_UPDATE_CRC_ERR},
     {"image length Error.",            FLASH_UPDATE_LENGTH_ERR},
     {"Failed to program flash chip",   FLASH_UPDATE_HW_ERR},
     {"Flash chip not supported.",      FLASH_UPDATE_DNLD_NOT_SUPPORTED},
     {"Flash update disabled.",         FLASH_UPDATE_DISABLED},
     {"Flash in progress",              FLASH_IN_PROGRESS},
     {"Image file size Error",          FAIL_FILE_SIZE},
     {"Input parameter error",          FAIL_PARAMETERS},
     {"Out of memory",                  FAIL_OUT_MEMORY},
     {"OK", 0}  /* Last entry err_code = 0. */
};

static int pm8001_set_nvmd(struct pm8001_hba_info *pm8001_ha)
{
        struct pm8001_ioctl_payload     *payload;
        DECLARE_COMPLETION_ONSTACK(completion);
        u8              *ioctlbuffer;
        u32             ret;
        u32             length = 1024 * 5 + sizeof(*payload) - 1;

        if (pm8001_ha->fw_image->size > 4096) {
                pm8001_ha->fw_status = FAIL_FILE_SIZE;
                return -EFAULT;
        }

        ioctlbuffer = kzalloc(length, GFP_KERNEL);
        if (!ioctlbuffer) {
                pm8001_ha->fw_status = FAIL_OUT_MEMORY;
                return -ENOMEM;
        }
        payload = (struct pm8001_ioctl_payload *)ioctlbuffer;
        memcpy((u8 *)&payload->func_specific, (u8 *)pm8001_ha->fw_image->data,
                                pm8001_ha->fw_image->size);
        payload->length = pm8001_ha->fw_image->size;
        payload->id = 0;
        payload->minor_function = 0x1;
        pm8001_ha->nvmd_completion = &completion;
        ret = PM8001_CHIP_DISP->set_nvmd_req(pm8001_ha, payload);
        if (ret) {
                pm8001_ha->fw_status = FAIL_OUT_MEMORY;
                goto out;
        }
        wait_for_completion(&completion);
out:
        kfree(ioctlbuffer);
        return ret;
}

static int pm8001_update_flash(struct pm8001_hba_info *pm8001_ha)
{
        struct pm8001_ioctl_payload     *payload;
        DECLARE_COMPLETION_ONSTACK(completion);
        u8              *ioctlbuffer;
        struct fw_control_info  *fwControl;
        u32             partitionSize, partitionSizeTmp;
        u32             loopNumber, loopcount;
        struct pm8001_fw_image_header *image_hdr;
        u32             sizeRead = 0;
        u32             ret = 0;
        u32             length = 1024 * 16 + sizeof(*payload) - 1;

        if (pm8001_ha->fw_image->size < 28) {
                pm8001_ha->fw_status = FAIL_FILE_SIZE;
                return -EFAULT;
        }
        ioctlbuffer = kzalloc(length, GFP_KERNEL);
        if (!ioctlbuffer) {
                pm8001_ha->fw_status = FAIL_OUT_MEMORY;
                return -ENOMEM;
        }
        image_hdr = (struct pm8001_fw_image_header *)pm8001_ha->fw_image->data;
        while (sizeRead < pm8001_ha->fw_image->size) {
                partitionSizeTmp =
                        *(u32 *)((u8 *)&image_hdr->image_length + sizeRead);
                partitionSize = be32_to_cpu(partitionSizeTmp);
                loopcount = DIV_ROUND_UP(partitionSize + HEADER_LEN,
                                        IOCTL_BUF_SIZE);
                for (loopNumber = 0; loopNumber < loopcount; loopNumber++) {
                        payload = (struct pm8001_ioctl_payload *)ioctlbuffer;
                        payload->length = 1024*16;
                        payload->id = 0;
                        fwControl =
                              (struct fw_control_info *)&payload->func_specific;
                        fwControl->len = IOCTL_BUF_SIZE;   /* IN */
                        fwControl->size = partitionSize + HEADER_LEN;/* IN */
                        fwControl->retcode = 0;/* OUT */
                        fwControl->offset = loopNumber * IOCTL_BUF_SIZE;/*OUT */

                /* for the last chunk of data in case file size is not even with
                4k, load only the rest*/
                if (((loopcount-loopNumber) == 1) &&
                        ((partitionSize + HEADER_LEN) % IOCTL_BUF_SIZE)) {
                        fwControl->len =
                                (partitionSize + HEADER_LEN) % IOCTL_BUF_SIZE;
                        memcpy((u8 *)fwControl->buffer,
                                (u8 *)pm8001_ha->fw_image->data + sizeRead,
                                (partitionSize + HEADER_LEN) % IOCTL_BUF_SIZE);
                        sizeRead +=
                                (partitionSize + HEADER_LEN) % IOCTL_BUF_SIZE;
                } else {
                        memcpy((u8 *)fwControl->buffer,
                                (u8 *)pm8001_ha->fw_image->data + sizeRead,
                                IOCTL_BUF_SIZE);
                        sizeRead += IOCTL_BUF_SIZE;
                }

                pm8001_ha->nvmd_completion = &completion;
                ret = PM8001_CHIP_DISP->fw_flash_update_req(pm8001_ha, payload);
                if (ret) {
                        pm8001_ha->fw_status = FAIL_OUT_MEMORY;
                        goto out;
                }
                wait_for_completion(&completion);
                if (fwControl->retcode > FLASH_UPDATE_IN_PROGRESS) {
                        pm8001_ha->fw_status = fwControl->retcode;
                        ret = -EFAULT;
                        goto out;
                }
                }
        }
out:
        kfree(ioctlbuffer);
        return ret;
}
static ssize_t pm8001_store_update_fw(struct device *cdev,
                                      struct device_attribute *attr,
                                      const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
        char *cmd_ptr, *filename_ptr;
        int res, i;
        int flash_command = FLASH_CMD_NONE;
        int ret;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        /* this test protects us from running two flash processes at once,
         * so we should start with this test */
        if (pm8001_ha->fw_status == FLASH_IN_PROGRESS)
                return -EINPROGRESS;
        pm8001_ha->fw_status = FLASH_IN_PROGRESS;

        cmd_ptr = kzalloc(count*2, GFP_KERNEL);
        if (!cmd_ptr) {
                pm8001_ha->fw_status = FAIL_OUT_MEMORY;
                return -ENOMEM;
        }

        filename_ptr = cmd_ptr + count;
        res = sscanf(buf, "%s %s", cmd_ptr, filename_ptr);
        if (res != 2) {
                pm8001_ha->fw_status = FAIL_PARAMETERS;
                ret = -EINVAL;
                goto out;
        }

        for (i = 0; flash_command_table[i].code != FLASH_CMD_NONE; i++) {
                if (!memcmp(flash_command_table[i].command,
                                 cmd_ptr, strlen(cmd_ptr))) {
                        flash_command = flash_command_table[i].code;
                        break;
                }
        }
        if (flash_command == FLASH_CMD_NONE) {
                pm8001_ha->fw_status = FAIL_PARAMETERS;
                ret = -EINVAL;
                goto out;
        }

        ret = request_firmware(&pm8001_ha->fw_image,
                               filename_ptr,
                               pm8001_ha->dev);

        if (ret) {
                PM8001_FAIL_DBG(pm8001_ha,
                        pm8001_printk(
                        "Failed to load firmware image file %s, error %d\n",
                        filename_ptr, ret));
                pm8001_ha->fw_status = FAIL_OPEN_BIOS_FILE;
                goto out;
        }

        if (FLASH_CMD_UPDATE == flash_command)
                ret = pm8001_update_flash(pm8001_ha);
        else
                ret = pm8001_set_nvmd(pm8001_ha);

        release_firmware(pm8001_ha->fw_image);
out:
        kfree(cmd_ptr);

        if (ret)
                return ret;

        pm8001_ha->fw_status = FLASH_OK;
        return count;
}

static ssize_t pm8001_show_update_fw(struct device *cdev,
                                     struct device_attribute *attr, char *buf)
{
        int i;
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;

        for (i = 0; flash_error_table[i].err_code != 0; i++) {
                if (flash_error_table[i].err_code == pm8001_ha->fw_status)
                        break;
        }
        if (pm8001_ha->fw_status != FLASH_IN_PROGRESS)
                pm8001_ha->fw_status = FLASH_OK;

        return snprintf(buf, PAGE_SIZE, "status=%x %s\n",
                        flash_error_table[i].err_code,
                        flash_error_table[i].reason);
}

static DEVICE_ATTR(update_fw, S_IRUGO|S_IWUSR|S_IWGRP,
        pm8001_show_update_fw, pm8001_store_update_fw);
struct device_attribute *pm8001_host_attrs[] = {
        &dev_attr_interface_rev,
        &dev_attr_fw_version,
        &dev_attr_update_fw,
        &dev_attr_aap_log,
        &dev_attr_iop_log,
        &dev_attr_fatal_log,
        &dev_attr_gsm_log,
        &dev_attr_max_out_io,
        &dev_attr_max_devices,
        &dev_attr_max_sg_list,
        &dev_attr_sas_spec_support,
        &dev_attr_logging_level,
        &dev_attr_host_sas_address,
        &dev_attr_bios_version,
        &dev_attr_ib_log,
        &dev_attr_ob_log,
        NULL,
};