This client driver allows you to use a GPIO pin as a source for PPS

[linux-2.6/next.git] / drivers / scsi / aacraid / commsup.c

/*
 *      Adaptec AAC series RAID controller driver
 *      (c) Copyright 2001 Red Hat Inc.
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000-2010 Adaptec, Inc.
 *               2010 PMC-Sierra, Inc. (aacraid@pmc-sierra.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, 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Module Name:
 *  commsup.c
 *
 * Abstract: Contain all routines that are required for FSA host/adapter
 *    communication.
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/semaphore.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>

#include "aacraid.h"

/**
 *      fib_map_alloc           -       allocate the fib objects
 *      @dev: Adapter to allocate for
 *
 *      Allocate and map the shared PCI space for the FIB blocks used to
 *      talk to the Adaptec firmware.
 */

static int fib_map_alloc(struct aac_dev *dev)
{
        dprintk((KERN_INFO
          "allocate hardware fibs pci_alloc_consistent(%p, %d * (%d + %d), %p)\n",
          dev->pdev, dev->max_fib_size, dev->scsi_host_ptr->can_queue,
          AAC_NUM_MGT_FIB, &dev->hw_fib_pa));
        dev->hw_fib_va = pci_alloc_consistent(dev->pdev,
                (dev->max_fib_size + sizeof(struct aac_fib_xporthdr))
                * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB) + (ALIGN32 - 1),
                &dev->hw_fib_pa);
        if (dev->hw_fib_va == NULL)
                return -ENOMEM;
        return 0;
}

/**
 *      aac_fib_map_free                -       free the fib objects
 *      @dev: Adapter to free
 *
 *      Free the PCI mappings and the memory allocated for FIB blocks
 *      on this adapter.
 */

void aac_fib_map_free(struct aac_dev *dev)
{
        pci_free_consistent(dev->pdev,
          dev->max_fib_size * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB),
          dev->hw_fib_va, dev->hw_fib_pa);
        dev->hw_fib_va = NULL;
        dev->hw_fib_pa = 0;
}

/**
 *      aac_fib_setup   -       setup the fibs
 *      @dev: Adapter to set up
 *
 *      Allocate the PCI space for the fibs, map it and then initialise the
 *      fib area, the unmapped fib data and also the free list
 */

int aac_fib_setup(struct aac_dev * dev)
{
        struct fib *fibptr;
        struct hw_fib *hw_fib;
        dma_addr_t hw_fib_pa;
        int i;

        while (((i = fib_map_alloc(dev)) == -ENOMEM)
         && (dev->scsi_host_ptr->can_queue > (64 - AAC_NUM_MGT_FIB))) {
                dev->init->MaxIoCommands = cpu_to_le32((dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB) >> 1);
                dev->scsi_host_ptr->can_queue = le32_to_cpu(dev->init->MaxIoCommands) - AAC_NUM_MGT_FIB;
        }
        if (i<0)
                return -ENOMEM;

        /* 32 byte alignment for PMC */
        hw_fib_pa = (dev->hw_fib_pa + (ALIGN32 - 1)) & ~(ALIGN32 - 1);
        dev->hw_fib_va = (struct hw_fib *)((unsigned char *)dev->hw_fib_va +
                (hw_fib_pa - dev->hw_fib_pa));
        dev->hw_fib_pa = hw_fib_pa;
        memset(dev->hw_fib_va, 0,
                (dev->max_fib_size + sizeof(struct aac_fib_xporthdr)) *
                (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB));

        /* add Xport header */
        dev->hw_fib_va = (struct hw_fib *)((unsigned char *)dev->hw_fib_va +
                sizeof(struct aac_fib_xporthdr));
        dev->hw_fib_pa += sizeof(struct aac_fib_xporthdr);

        hw_fib = dev->hw_fib_va;
        hw_fib_pa = dev->hw_fib_pa;
        /*
         *      Initialise the fibs
         */
        for (i = 0, fibptr = &dev->fibs[i];
                i < (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB);
                i++, fibptr++)
        {
                fibptr->dev = dev;
                fibptr->hw_fib_va = hw_fib;
                fibptr->data = (void *) fibptr->hw_fib_va->data;
                fibptr->next = fibptr+1;        /* Forward chain the fibs */
                sema_init(&fibptr->event_wait, 0);
                spin_lock_init(&fibptr->event_lock);
                hw_fib->header.XferState = cpu_to_le32(0xffffffff);
                hw_fib->header.SenderSize = cpu_to_le16(dev->max_fib_size);
                fibptr->hw_fib_pa = hw_fib_pa;
                hw_fib = (struct hw_fib *)((unsigned char *)hw_fib +
                        dev->max_fib_size + sizeof(struct aac_fib_xporthdr));
                hw_fib_pa = hw_fib_pa +
                        dev->max_fib_size + sizeof(struct aac_fib_xporthdr);
        }
        /*
         *      Add the fib chain to the free list
         */
        dev->fibs[dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB - 1].next = NULL;
        /*
         *      Enable this to debug out of queue space
         */
        dev->free_fib = &dev->fibs[0];
        return 0;
}

/**
 *      aac_fib_alloc   -       allocate a fib
 *      @dev: Adapter to allocate the fib for
 *
 *      Allocate a fib from the adapter fib pool. If the pool is empty we
 *      return NULL.
 */

struct fib *aac_fib_alloc(struct aac_dev *dev)
{
        struct fib * fibptr;
        unsigned long flags;
        spin_lock_irqsave(&dev->fib_lock, flags);
        fibptr = dev->free_fib;
        if(!fibptr){
                spin_unlock_irqrestore(&dev->fib_lock, flags);
                return fibptr;
        }
        dev->free_fib = fibptr->next;
        spin_unlock_irqrestore(&dev->fib_lock, flags);
        /*
         *      Set the proper node type code and node byte size
         */
        fibptr->type = FSAFS_NTC_FIB_CONTEXT;
        fibptr->size = sizeof(struct fib);
        /*
         *      Null out fields that depend on being zero at the start of
         *      each I/O
         */
        fibptr->hw_fib_va->header.XferState = 0;
        fibptr->flags = 0;
        fibptr->callback = NULL;
        fibptr->callback_data = NULL;

        return fibptr;
}

/**
 *      aac_fib_free    -       free a fib
 *      @fibptr: fib to free up
 *
 *      Frees up a fib and places it on the appropriate queue
 */

void aac_fib_free(struct fib *fibptr)
{
        unsigned long flags, flagsv;

        spin_lock_irqsave(&fibptr->event_lock, flagsv);
        if (fibptr->done == 2) {
                spin_unlock_irqrestore(&fibptr->event_lock, flagsv);
                return;
        }
        spin_unlock_irqrestore(&fibptr->event_lock, flagsv);

        spin_lock_irqsave(&fibptr->dev->fib_lock, flags);
        if (unlikely(fibptr->flags & FIB_CONTEXT_FLAG_TIMED_OUT))
                aac_config.fib_timeouts++;
        if (fibptr->hw_fib_va->header.XferState != 0) {
                printk(KERN_WARNING "aac_fib_free, XferState != 0, fibptr = 0x%p, XferState = 0x%x\n",
                         (void*)fibptr,
                         le32_to_cpu(fibptr->hw_fib_va->header.XferState));
        }
        fibptr->next = fibptr->dev->free_fib;
        fibptr->dev->free_fib = fibptr;
        spin_unlock_irqrestore(&fibptr->dev->fib_lock, flags);
}

/**
 *      aac_fib_init    -       initialise a fib
 *      @fibptr: The fib to initialize
 *
 *      Set up the generic fib fields ready for use
 */

void aac_fib_init(struct fib *fibptr)
{
        struct hw_fib *hw_fib = fibptr->hw_fib_va;

        hw_fib->header.StructType = FIB_MAGIC;
        hw_fib->header.Size = cpu_to_le16(fibptr->dev->max_fib_size);
        hw_fib->header.XferState = cpu_to_le32(HostOwned | FibInitialized | FibEmpty | FastResponseCapable);
        hw_fib->header.SenderFibAddress = 0; /* Filled in later if needed */
        hw_fib->header.ReceiverFibAddress = cpu_to_le32(fibptr->hw_fib_pa);
        hw_fib->header.SenderSize = cpu_to_le16(fibptr->dev->max_fib_size);
}

/**
 *      fib_deallocate          -       deallocate a fib
 *      @fibptr: fib to deallocate
 *
 *      Will deallocate and return to the free pool the FIB pointed to by the
 *      caller.
 */

static void fib_dealloc(struct fib * fibptr)
{
        struct hw_fib *hw_fib = fibptr->hw_fib_va;
        BUG_ON(hw_fib->header.StructType != FIB_MAGIC);
        hw_fib->header.XferState = 0;
}

/*
 *      Commuication primitives define and support the queuing method we use to
 *      support host to adapter commuication. All queue accesses happen through
 *      these routines and are the only routines which have a knowledge of the
 *       how these queues are implemented.
 */

/**
 *      aac_get_entry           -       get a queue entry
 *      @dev: Adapter
 *      @qid: Queue Number
 *      @entry: Entry return
 *      @index: Index return
 *      @nonotify: notification control
 *
 *      With a priority the routine returns a queue entry if the queue has free entries. If the queue
 *      is full(no free entries) than no entry is returned and the function returns 0 otherwise 1 is
 *      returned.
 */

static int aac_get_entry (struct aac_dev * dev, u32 qid, struct aac_entry **entry, u32 * index, unsigned long *nonotify)
{
        struct aac_queue * q;
        unsigned long idx;

        /*
         *      All of the queues wrap when they reach the end, so we check
         *      to see if they have reached the end and if they have we just
         *      set the index back to zero. This is a wrap. You could or off
         *      the high bits in all updates but this is a bit faster I think.
         */

        q = &dev->queues->queue[qid];

        idx = *index = le32_to_cpu(*(q->headers.producer));
        /* Interrupt Moderation, only interrupt for first two entries */
        if (idx != le32_to_cpu(*(q->headers.consumer))) {
                if (--idx == 0) {
                        if (qid == AdapNormCmdQueue)
                                idx = ADAP_NORM_CMD_ENTRIES;
                        else
                                idx = ADAP_NORM_RESP_ENTRIES;
                }
                if (idx != le32_to_cpu(*(q->headers.consumer)))
                        *nonotify = 1;
        }

        if (qid == AdapNormCmdQueue) {
                if (*index >= ADAP_NORM_CMD_ENTRIES)
                        *index = 0; /* Wrap to front of the Producer Queue. */
        } else {
                if (*index >= ADAP_NORM_RESP_ENTRIES)
                        *index = 0; /* Wrap to front of the Producer Queue. */
        }

        /* Queue is full */
        if ((*index + 1) == le32_to_cpu(*(q->headers.consumer))) {
                printk(KERN_WARNING "Queue %d full, %u outstanding.\n",
                                qid, q->numpending);
                return 0;
        } else {
                *entry = q->base + *index;
                return 1;
        }
}

/**
 *      aac_queue_get           -       get the next free QE
 *      @dev: Adapter
 *      @index: Returned index
 *      @priority: Priority of fib
 *      @fib: Fib to associate with the queue entry
 *      @wait: Wait if queue full
 *      @fibptr: Driver fib object to go with fib
 *      @nonotify: Don't notify the adapter
 *
 *      Gets the next free QE off the requested priorty adapter command
 *      queue and associates the Fib with the QE. The QE represented by
 *      index is ready to insert on the queue when this routine returns
 *      success.
 */

int aac_queue_get(struct aac_dev * dev, u32 * index, u32 qid, struct hw_fib * hw_fib, int wait, struct fib * fibptr, unsigned long *nonotify)
{
        struct aac_entry * entry = NULL;
        int map = 0;

        if (qid == AdapNormCmdQueue) {
                /*  if no entries wait for some if caller wants to */
                while (!aac_get_entry(dev, qid, &entry, index, nonotify)) {
                        printk(KERN_ERR "GetEntries failed\n");
                }
                /*
                 *      Setup queue entry with a command, status and fib mapped
                 */
                entry->size = cpu_to_le32(le16_to_cpu(hw_fib->header.Size));
                map = 1;
        } else {
                while (!aac_get_entry(dev, qid, &entry, index, nonotify)) {
                        /* if no entries wait for some if caller wants to */
                }
                /*
                 *      Setup queue entry with command, status and fib mapped
                 */
                entry->size = cpu_to_le32(le16_to_cpu(hw_fib->header.Size));
                entry->addr = hw_fib->header.SenderFibAddress;
                        /* Restore adapters pointer to the FIB */
                hw_fib->header.ReceiverFibAddress = hw_fib->header.SenderFibAddress;    /* Let the adapter now where to find its data */
                map = 0;
        }
        /*
         *      If MapFib is true than we need to map the Fib and put pointers
         *      in the queue entry.
         */
        if (map)
                entry->addr = cpu_to_le32(fibptr->hw_fib_pa);
        return 0;
}

/*
 *      Define the highest level of host to adapter communication routines.
 *      These routines will support host to adapter FS commuication. These
 *      routines have no knowledge of the commuication method used. This level
 *      sends and receives FIBs. This level has no knowledge of how these FIBs
 *      get passed back and forth.
 */

/**
 *      aac_fib_send    -       send a fib to the adapter
 *      @command: Command to send
 *      @fibptr: The fib
 *      @size: Size of fib data area
 *      @priority: Priority of Fib
 *      @wait: Async/sync select
 *      @reply: True if a reply is wanted
 *      @callback: Called with reply
 *      @callback_data: Passed to callback
 *
 *      Sends the requested FIB to the adapter and optionally will wait for a
 *      response FIB. If the caller does not wish to wait for a response than
 *      an event to wait on must be supplied. This event will be set when a
 *      response FIB is received from the adapter.
 */

int aac_fib_send(u16 command, struct fib *fibptr, unsigned long size,
                int priority, int wait, int reply, fib_callback callback,
                void *callback_data)
{
        struct aac_dev * dev = fibptr->dev;
        struct hw_fib * hw_fib = fibptr->hw_fib_va;
        unsigned long flags = 0;
        unsigned long qflags;
        unsigned long mflags = 0;


        if (!(hw_fib->header.XferState & cpu_to_le32(HostOwned)))
                return -EBUSY;
        /*
         *      There are 5 cases with the wait and response requested flags.
         *      The only invalid cases are if the caller requests to wait and
         *      does not request a response and if the caller does not want a
         *      response and the Fib is not allocated from pool. If a response
         *      is not requesed the Fib will just be deallocaed by the DPC
         *      routine when the response comes back from the adapter. No
         *      further processing will be done besides deleting the Fib. We
         *      will have a debug mode where the adapter can notify the host
         *      it had a problem and the host can log that fact.
         */
        fibptr->flags = 0;
        if (wait && !reply) {
                return -EINVAL;
        } else if (!wait && reply) {
                hw_fib->header.XferState |= cpu_to_le32(Async | ResponseExpected);
                FIB_COUNTER_INCREMENT(aac_config.AsyncSent);
        } else if (!wait && !reply) {
                hw_fib->header.XferState |= cpu_to_le32(NoResponseExpected);
                FIB_COUNTER_INCREMENT(aac_config.NoResponseSent);
        } else if (wait && reply) {
                hw_fib->header.XferState |= cpu_to_le32(ResponseExpected);
                FIB_COUNTER_INCREMENT(aac_config.NormalSent);
        }
        /*
         *      Map the fib into 32bits by using the fib number
         */

        hw_fib->header.SenderFibAddress = cpu_to_le32(((u32)(fibptr - dev->fibs)) << 2);
        hw_fib->header.SenderData = (u32)(fibptr - dev->fibs);
        /*
         *      Set FIB state to indicate where it came from and if we want a
         *      response from the adapter. Also load the command from the
         *      caller.
         *
         *      Map the hw fib pointer as a 32bit value
         */
        hw_fib->header.Command = cpu_to_le16(command);
        hw_fib->header.XferState |= cpu_to_le32(SentFromHost);
        fibptr->hw_fib_va->header.Flags = 0;    /* 0 the flags field - internal only*/
        /*
         *      Set the size of the Fib we want to send to the adapter
         */
        hw_fib->header.Size = cpu_to_le16(sizeof(struct aac_fibhdr) + size);
        if (le16_to_cpu(hw_fib->header.Size) > le16_to_cpu(hw_fib->header.SenderSize)) {
                return -EMSGSIZE;
        }
        /*
         *      Get a queue entry connect the FIB to it and send an notify
         *      the adapter a command is ready.
         */
        hw_fib->header.XferState |= cpu_to_le32(NormalPriority);

        /*
         *      Fill in the Callback and CallbackContext if we are not
         *      going to wait.
         */
        if (!wait) {
                fibptr->callback = callback;
                fibptr->callback_data = callback_data;
                fibptr->flags = FIB_CONTEXT_FLAG;
        }

        fibptr->done = 0;

        FIB_COUNTER_INCREMENT(aac_config.FibsSent);

        dprintk((KERN_DEBUG "Fib contents:.\n"));
        dprintk((KERN_DEBUG "  Command =               %d.\n", le32_to_cpu(hw_fib->header.Command)));
        dprintk((KERN_DEBUG "  SubCommand =            %d.\n", le32_to_cpu(((struct aac_query_mount *)fib_data(fibptr))->command)));
        dprintk((KERN_DEBUG "  XferState  =            %x.\n", le32_to_cpu(hw_fib->header.XferState)));
        dprintk((KERN_DEBUG "  hw_fib va being sent=%p\n",fibptr->hw_fib_va));
        dprintk((KERN_DEBUG "  hw_fib pa being sent=%lx\n",(ulong)fibptr->hw_fib_pa));
        dprintk((KERN_DEBUG "  fib being sent=%p\n",fibptr));

        if (!dev->queues)
                return -EBUSY;

        if (wait) {

                spin_lock_irqsave(&dev->manage_lock, mflags);
                if (dev->management_fib_count >= AAC_NUM_MGT_FIB) {
                        printk(KERN_INFO "No management Fibs Available:%d\n",
                                                dev->management_fib_count);
                        spin_unlock_irqrestore(&dev->manage_lock, mflags);
                        return -EBUSY;
                }
                dev->management_fib_count++;
                spin_unlock_irqrestore(&dev->manage_lock, mflags);
                spin_lock_irqsave(&fibptr->event_lock, flags);
        }

        if (aac_adapter_deliver(fibptr) != 0) {
                printk(KERN_ERR "aac_fib_send: returned -EBUSY\n");
                if (wait) {
                        spin_unlock_irqrestore(&fibptr->event_lock, flags);
                        spin_lock_irqsave(&dev->manage_lock, mflags);
                        dev->management_fib_count--;
                        spin_unlock_irqrestore(&dev->manage_lock, mflags);
                }
                return -EBUSY;
        }


        /*
         *      If the caller wanted us to wait for response wait now.
         */

        if (wait) {
                spin_unlock_irqrestore(&fibptr->event_lock, flags);
                /* Only set for first known interruptable command */
                if (wait < 0) {
                        /*
                         * *VERY* Dangerous to time out a command, the
                         * assumption is made that we have no hope of
                         * functioning because an interrupt routing or other
                         * hardware failure has occurred.
                         */
                        unsigned long count = 36000000L; /* 3 minutes */
                        while (down_trylock(&fibptr->event_wait)) {
                                int blink;
                                if (--count == 0) {
                                        struct aac_queue * q = &dev->queues->queue[AdapNormCmdQueue];
                                        spin_lock_irqsave(q->lock, qflags);
                                        q->numpending--;
                                        spin_unlock_irqrestore(q->lock, qflags);
                                        if (wait == -1) {
                                                printk(KERN_ERR "aacraid: aac_fib_send: first asynchronous command timed out.\n"
                                                  "Usually a result of a PCI interrupt routing problem;\n"
                                                  "update mother board BIOS or consider utilizing one of\n"
                                                  "the SAFE mode kernel options (acpi, apic etc)\n");
                                        }
                                        return -ETIMEDOUT;
                                }
                                if ((blink = aac_adapter_check_health(dev)) > 0) {
                                        if (wait == -1) {
                                                printk(KERN_ERR "aacraid: aac_fib_send: adapter blinkLED 0x%x.\n"
                                                  "Usually a result of a serious unrecoverable hardware problem\n",
                                                  blink);
                                        }
                                        return -EFAULT;
                                }
                                udelay(5);
                        }
                } else if (down_interruptible(&fibptr->event_wait)) {
                        /* Do nothing ... satisfy
                         * down_interruptible must_check */
                }

                spin_lock_irqsave(&fibptr->event_lock, flags);
                if (fibptr->done == 0) {
                        fibptr->done = 2; /* Tell interrupt we aborted */
                        spin_unlock_irqrestore(&fibptr->event_lock, flags);
                        return -ERESTARTSYS;
                }
                spin_unlock_irqrestore(&fibptr->event_lock, flags);
                BUG_ON(fibptr->done == 0);

                if(unlikely(fibptr->flags & FIB_CONTEXT_FLAG_TIMED_OUT))
                        return -ETIMEDOUT;
                return 0;
        }
        /*
         *      If the user does not want a response than return success otherwise
         *      return pending
         */
        if (reply)
                return -EINPROGRESS;
        else
                return 0;
}

/**
 *      aac_consumer_get        -       get the top of the queue
 *      @dev: Adapter
 *      @q: Queue
 *      @entry: Return entry
 *
 *      Will return a pointer to the entry on the top of the queue requested that
 *      we are a consumer of, and return the address of the queue entry. It does
 *      not change the state of the queue.
 */

int aac_consumer_get(struct aac_dev * dev, struct aac_queue * q, struct aac_entry **entry)
{
        u32 index;
        int status;
        if (le32_to_cpu(*q->headers.producer) == le32_to_cpu(*q->headers.consumer)) {
                status = 0;
        } else {
                /*
                 *      The consumer index must be wrapped if we have reached
                 *      the end of the queue, else we just use the entry
                 *      pointed to by the header index
                 */
                if (le32_to_cpu(*q->headers.consumer) >= q->entries)
                        index = 0;
                else
                        index = le32_to_cpu(*q->headers.consumer);
                *entry = q->base + index;
                status = 1;
        }
        return(status);
}

/**
 *      aac_consumer_free       -       free consumer entry
 *      @dev: Adapter
 *      @q: Queue
 *      @qid: Queue ident
 *
 *      Frees up the current top of the queue we are a consumer of. If the
 *      queue was full notify the producer that the queue is no longer full.
 */

void aac_consumer_free(struct aac_dev * dev, struct aac_queue *q, u32 qid)
{
        int wasfull = 0;
        u32 notify;

        if ((le32_to_cpu(*q->headers.producer)+1) == le32_to_cpu(*q->headers.consumer))
                wasfull = 1;

        if (le32_to_cpu(*q->headers.consumer) >= q->entries)
                *q->headers.consumer = cpu_to_le32(1);
        else
                le32_add_cpu(q->headers.consumer, 1);

        if (wasfull) {
                switch (qid) {

                case HostNormCmdQueue:
                        notify = HostNormCmdNotFull;
                        break;
                case HostNormRespQueue:
                        notify = HostNormRespNotFull;
                        break;
                default:
                        BUG();
                        return;
                }
                aac_adapter_notify(dev, notify);
        }
}

/**
 *      aac_fib_adapter_complete        -       complete adapter issued fib
 *      @fibptr: fib to complete
 *      @size: size of fib
 *
 *      Will do all necessary work to complete a FIB that was sent from
 *      the adapter.
 */

int aac_fib_adapter_complete(struct fib *fibptr, unsigned short size)
{
        struct hw_fib * hw_fib = fibptr->hw_fib_va;
        struct aac_dev * dev = fibptr->dev;
        struct aac_queue * q;
        unsigned long nointr = 0;
        unsigned long qflags;

        if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE1) {
                kfree(hw_fib);
                return 0;
        }

        if (hw_fib->header.XferState == 0) {
                if (dev->comm_interface == AAC_COMM_MESSAGE)
                        kfree(hw_fib);
                return 0;
        }
        /*
         *      If we plan to do anything check the structure type first.
         */
        if (hw_fib->header.StructType != FIB_MAGIC) {
                if (dev->comm_interface == AAC_COMM_MESSAGE)
                        kfree(hw_fib);
                return -EINVAL;
        }
        /*
         *      This block handles the case where the adapter had sent us a
         *      command and we have finished processing the command. We
         *      call completeFib when we are done processing the command
         *      and want to send a response back to the adapter. This will
         *      send the completed cdb to the adapter.
         */
        if (hw_fib->header.XferState & cpu_to_le32(SentFromAdapter)) {
                if (dev->comm_interface == AAC_COMM_MESSAGE) {
                        kfree (hw_fib);
                } else {
                        u32 index;
                        hw_fib->header.XferState |= cpu_to_le32(HostProcessed);
                        if (size) {
                                size += sizeof(struct aac_fibhdr);
                                if (size > le16_to_cpu(hw_fib->header.SenderSize))
                                        return -EMSGSIZE;
                                hw_fib->header.Size = cpu_to_le16(size);
                        }
                        q = &dev->queues->queue[AdapNormRespQueue];
                        spin_lock_irqsave(q->lock, qflags);
                        aac_queue_get(dev, &index, AdapNormRespQueue, hw_fib, 1, NULL, &nointr);
                        *(q->headers.producer) = cpu_to_le32(index + 1);
                        spin_unlock_irqrestore(q->lock, qflags);
                        if (!(nointr & (int)aac_config.irq_mod))
                                aac_adapter_notify(dev, AdapNormRespQueue);
                }
        } else {
                printk(KERN_WARNING "aac_fib_adapter_complete: "
                        "Unknown xferstate detected.\n");
                BUG();
        }
        return 0;
}

/**
 *      aac_fib_complete        -       fib completion handler
 *      @fib: FIB to complete
 *
 *      Will do all necessary work to complete a FIB.
 */

int aac_fib_complete(struct fib *fibptr)
{
        unsigned long flags;
        struct hw_fib * hw_fib = fibptr->hw_fib_va;

        /*
         *      Check for a fib which has already been completed
         */

        if (hw_fib->header.XferState == 0)
                return 0;
        /*
         *      If we plan to do anything check the structure type first.
         */

        if (hw_fib->header.StructType != FIB_MAGIC)
                return -EINVAL;
        /*
         *      This block completes a cdb which orginated on the host and we
         *      just need to deallocate the cdb or reinit it. At this point the
         *      command is complete that we had sent to the adapter and this
         *      cdb could be reused.
         */
        spin_lock_irqsave(&fibptr->event_lock, flags);
        if (fibptr->done == 2) {
                spin_unlock_irqrestore(&fibptr->event_lock, flags);
                return 0;
        }
        spin_unlock_irqrestore(&fibptr->event_lock, flags);

        if((hw_fib->header.XferState & cpu_to_le32(SentFromHost)) &&
                (hw_fib->header.XferState & cpu_to_le32(AdapterProcessed)))
        {
                fib_dealloc(fibptr);
        }
        else if(hw_fib->header.XferState & cpu_to_le32(SentFromHost))
        {
                /*
                 *      This handles the case when the host has aborted the I/O
                 *      to the adapter because the adapter is not responding
                 */
                fib_dealloc(fibptr);
        } else if(hw_fib->header.XferState & cpu_to_le32(HostOwned)) {
                fib_dealloc(fibptr);
        } else {
                BUG();
        }
        return 0;
}

/**
 *      aac_printf      -       handle printf from firmware
 *      @dev: Adapter
 *      @val: Message info
 *
 *      Print a message passed to us by the controller firmware on the
 *      Adaptec board
 */

void aac_printf(struct aac_dev *dev, u32 val)
{
        char *cp = dev->printfbuf;
        if (dev->printf_enabled)
        {
                int length = val & 0xffff;
                int level = (val >> 16) & 0xffff;

                /*
                 *      The size of the printfbuf is set in port.c
                 *      There is no variable or define for it
                 */
                if (length > 255)
                        length = 255;
                if (cp[length] != 0)
                        cp[length] = 0;
                if (level == LOG_AAC_HIGH_ERROR)
                        printk(KERN_WARNING "%s:%s", dev->name, cp);
                else
                        printk(KERN_INFO "%s:%s", dev->name, cp);
        }
        memset(cp, 0, 256);
}


/**
 *      aac_handle_aif          -       Handle a message from the firmware
 *      @dev: Which adapter this fib is from
 *      @fibptr: Pointer to fibptr from adapter
 *
 *      This routine handles a driver notify fib from the adapter and
 *      dispatches it to the appropriate routine for handling.
 */

#define AIF_SNIFF_TIMEOUT       (30*HZ)
static void aac_handle_aif(struct aac_dev * dev, struct fib * fibptr)
{
        struct hw_fib * hw_fib = fibptr->hw_fib_va;
        struct aac_aifcmd * aifcmd = (struct aac_aifcmd *)hw_fib->data;
        u32 channel, id, lun, container;
        struct scsi_device *device;
        enum {
                NOTHING,
                DELETE,
                ADD,
                CHANGE
        } device_config_needed = NOTHING;

        /* Sniff for container changes */

        if (!dev || !dev->fsa_dev)
                return;
        container = channel = id = lun = (u32)-1;

        /*
         *      We have set this up to try and minimize the number of
         * re-configures that take place. As a result of this when
         * certain AIF's come in we will set a flag waiting for another
         * type of AIF before setting the re-config flag.
         */
        switch (le32_to_cpu(aifcmd->command)) {
        case AifCmdDriverNotify:
                switch (le32_to_cpu(((__le32 *)aifcmd->data)[0])) {
                /*
                 *      Morph or Expand complete
                 */
                case AifDenMorphComplete:
                case AifDenVolumeExtendComplete:
                        container = le32_to_cpu(((__le32 *)aifcmd->data)[1]);
                        if (container >= dev->maximum_num_containers)
                                break;

                        /*
                         *      Find the scsi_device associated with the SCSI
                         * address. Make sure we have the right array, and if
                         * so set the flag to initiate a new re-config once we
                         * see an AifEnConfigChange AIF come through.
                         */

                        if ((dev != NULL) && (dev->scsi_host_ptr != NULL)) {
                                device = scsi_device_lookup(dev->scsi_host_ptr,
                                        CONTAINER_TO_CHANNEL(container),
                                        CONTAINER_TO_ID(container),
                                        CONTAINER_TO_LUN(container));
                                if (device) {
                                        dev->fsa_dev[container].config_needed = CHANGE;
                                        dev->fsa_dev[container].config_waiting_on = AifEnConfigChange;
                                        dev->fsa_dev[container].config_waiting_stamp = jiffies;
                                        scsi_device_put(device);
                                }
                        }
                }

                /*
                 *      If we are waiting on something and this happens to be
                 * that thing then set the re-configure flag.
                 */
                if (container != (u32)-1) {
                        if (container >= dev->maximum_num_containers)
                                break;
                        if ((dev->fsa_dev[container].config_waiting_on ==
                            le32_to_cpu(*(__le32 *)aifcmd->data)) &&
                         time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
                                dev->fsa_dev[container].config_waiting_on = 0;
                } else for (container = 0;
                    container < dev->maximum_num_containers; ++container) {
                        if ((dev->fsa_dev[container].config_waiting_on ==
                            le32_to_cpu(*(__le32 *)aifcmd->data)) &&
                         time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
                                dev->fsa_dev[container].config_waiting_on = 0;
                }
                break;

        case AifCmdEventNotify:
                switch (le32_to_cpu(((__le32 *)aifcmd->data)[0])) {
                case AifEnBatteryEvent:
                        dev->cache_protected =
                                (((__le32 *)aifcmd->data)[1] == cpu_to_le32(3));
                        break;
                /*
                 *      Add an Array.
                 */
                case AifEnAddContainer:
                        container = le32_to_cpu(((__le32 *)aifcmd->data)[1]);
                        if (container >= dev->maximum_num_containers)
                                break;
                        dev->fsa_dev[container].config_needed = ADD;
                        dev->fsa_dev[container].config_waiting_on =
                                AifEnConfigChange;
                        dev->fsa_dev[container].config_waiting_stamp = jiffies;
                        break;

                /*
                 *      Delete an Array.
                 */
                case AifEnDeleteContainer:
                        container = le32_to_cpu(((__le32 *)aifcmd->data)[1]);
                        if (container >= dev->maximum_num_containers)
                                break;
                        dev->fsa_dev[container].config_needed = DELETE;
                        dev->fsa_dev[container].config_waiting_on =
                                AifEnConfigChange;
                        dev->fsa_dev[container].config_waiting_stamp = jiffies;
                        break;

                /*
                 *      Container change detected. If we currently are not
                 * waiting on something else, setup to wait on a Config Change.
                 */
                case AifEnContainerChange:
                        container = le32_to_cpu(((__le32 *)aifcmd->data)[1]);
                        if (container >= dev->maximum_num_containers)
                                break;
                        if (dev->fsa_dev[container].config_waiting_on &&
                         time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
                                break;
                        dev->fsa_dev[container].config_needed = CHANGE;
                        dev->fsa_dev[container].config_waiting_on =
                                AifEnConfigChange;
                        dev->fsa_dev[container].config_waiting_stamp = jiffies;
                        break;

                case AifEnConfigChange:
                        break;

                case AifEnAddJBOD:
                case AifEnDeleteJBOD:
                        container = le32_to_cpu(((__le32 *)aifcmd->data)[1]);
                        if ((container >> 28)) {
                                container = (u32)-1;
                                break;
                        }
                        channel = (container >> 24) & 0xF;
                        if (channel >= dev->maximum_num_channels) {
                                container = (u32)-1;
                                break;
                        }
                        id = container & 0xFFFF;
                        if (id >= dev->maximum_num_physicals) {
                                container = (u32)-1;
                                break;
                        }
                        lun = (container >> 16) & 0xFF;
                        container = (u32)-1;
                        channel = aac_phys_to_logical(channel);
                        device_config_needed =
                          (((__le32 *)aifcmd->data)[0] ==
                            cpu_to_le32(AifEnAddJBOD)) ? ADD : DELETE;
                        if (device_config_needed == ADD) {
                                device = scsi_device_lookup(dev->scsi_host_ptr,
                                        channel,
                                        id,
                                        lun);
                                if (device) {
                                        scsi_remove_device(device);
                                        scsi_device_put(device);
                                }
                        }
                        break;

                case AifEnEnclosureManagement:
                        /*
                         * If in JBOD mode, automatic exposure of new
                         * physical target to be suppressed until configured.
                         */
                        if (dev->jbod)
                                break;
                        switch (le32_to_cpu(((__le32 *)aifcmd->data)[3])) {
                        case EM_DRIVE_INSERTION:
                        case EM_DRIVE_REMOVAL:
                                container = le32_to_cpu(
                                        ((__le32 *)aifcmd->data)[2]);
                                if ((container >> 28)) {
                                        container = (u32)-1;
                                        break;
                                }
                                channel = (container >> 24) & 0xF;
                                if (channel >= dev->maximum_num_channels) {
                                        container = (u32)-1;
                                        break;
                                }
                                id = container & 0xFFFF;
                                lun = (container >> 16) & 0xFF;
                                container = (u32)-1;
                                if (id >= dev->maximum_num_physicals) {
                                        /* legacy dev_t ? */
                                        if ((0x2000 <= id) || lun || channel ||
                                          ((channel = (id >> 7) & 0x3F) >=
                                          dev->maximum_num_channels))
                                                break;
                                        lun = (id >> 4) & 7;
                                        id &= 0xF;
                                }
                                channel = aac_phys_to_logical(channel);
                                device_config_needed =
                                  (((__le32 *)aifcmd->data)[3]
                                    == cpu_to_le32(EM_DRIVE_INSERTION)) ?
                                  ADD : DELETE;
                                break;
                        }
                        break;
                }

                /*
                 *      If we are waiting on something and this happens to be
                 * that thing then set the re-configure flag.
                 */
                if (container != (u32)-1) {
                        if (container >= dev->maximum_num_containers)
                                break;
                        if ((dev->fsa_dev[container].config_waiting_on ==
                            le32_to_cpu(*(__le32 *)aifcmd->data)) &&
                         time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
                                dev->fsa_dev[container].config_waiting_on = 0;
                } else for (container = 0;
                    container < dev->maximum_num_containers; ++container) {
                        if ((dev->fsa_dev[container].config_waiting_on ==
                            le32_to_cpu(*(__le32 *)aifcmd->data)) &&
                         time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
                                dev->fsa_dev[container].config_waiting_on = 0;
                }
                break;

        case AifCmdJobProgress:
                /*
                 *      These are job progress AIF's. When a Clear is being
                 * done on a container it is initially created then hidden from
                 * the OS. When the clear completes we don't get a config
                 * change so we monitor the job status complete on a clear then
                 * wait for a container change.
                 */

                if (((__le32 *)aifcmd->data)[1] == cpu_to_le32(AifJobCtrZero) &&
                    (((__le32 *)aifcmd->data)[6] == ((__le32 *)aifcmd->data)[5] ||
                     ((__le32 *)aifcmd->data)[4] == cpu_to_le32(AifJobStsSuccess))) {
                        for (container = 0;
                            container < dev->maximum_num_containers;
                            ++container) {
                                /*
                                 * Stomp on all config sequencing for all
                                 * containers?
                                 */
                                dev->fsa_dev[container].config_waiting_on =
                                        AifEnContainerChange;
                                dev->fsa_dev[container].config_needed = ADD;
                                dev->fsa_dev[container].config_waiting_stamp =
                                        jiffies;
                        }
                }
                if (((__le32 *)aifcmd->data)[1] == cpu_to_le32(AifJobCtrZero) &&
                    ((__le32 *)aifcmd->data)[6] == 0 &&
                    ((__le32 *)aifcmd->data)[4] == cpu_to_le32(AifJobStsRunning)) {
                        for (container = 0;
                            container < dev->maximum_num_containers;
                            ++container) {
                                /*
                                 * Stomp on all config sequencing for all
                                 * containers?
                                 */
                                dev->fsa_dev[container].config_waiting_on =
                                        AifEnContainerChange;
                                dev->fsa_dev[container].config_needed = DELETE;
                                dev->fsa_dev[container].config_waiting_stamp =
                                        jiffies;
                        }
                }
                break;
        }

        container = 0;
retry_next:
        if (device_config_needed == NOTHING)
        for (; container < dev->maximum_num_containers; ++container) {
                if ((dev->fsa_dev[container].config_waiting_on == 0) &&
                        (dev->fsa_dev[container].config_needed != NOTHING) &&
                        time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT)) {
                        device_config_needed =
                                dev->fsa_dev[container].config_needed;
                        dev->fsa_dev[container].config_needed = NOTHING;
                        channel = CONTAINER_TO_CHANNEL(container);
                        id = CONTAINER_TO_ID(container);
                        lun = CONTAINER_TO_LUN(container);
                        break;
                }
        }
        if (device_config_needed == NOTHING)
                return;

        /*
         *      If we decided that a re-configuration needs to be done,
         * schedule it here on the way out the door, please close the door
         * behind you.
         */

        /*
         *      Find the scsi_device associated with the SCSI address,
         * and mark it as changed, invalidating the cache. This deals
         * with changes to existing device IDs.
         */

        if (!dev || !dev->scsi_host_ptr)
                return;
        /*
         * force reload of disk info via aac_probe_container
         */
        if ((channel == CONTAINER_CHANNEL) &&
          (device_config_needed != NOTHING)) {
                if (dev->fsa_dev[container].valid == 1)
                        dev->fsa_dev[container].valid = 2;
                aac_probe_container(dev, container);
        }
        device = scsi_device_lookup(dev->scsi_host_ptr, channel, id, lun);
        if (device) {
                switch (device_config_needed) {
                case DELETE:
#if (defined(AAC_DEBUG_INSTRUMENT_AIF_DELETE))
                        scsi_remove_device(device);
#else
                        if (scsi_device_online(device)) {
                                scsi_device_set_state(device, SDEV_OFFLINE);
                                sdev_printk(KERN_INFO, device,
                                        "Device offlined - %s\n",
                                        (channel == CONTAINER_CHANNEL) ?
                                                "array deleted" :
                                                "enclosure services event");
                        }
#endif
                        break;
                case ADD:
                        if (!scsi_device_online(device)) {
                                sdev_printk(KERN_INFO, device,
                                        "Device online - %s\n",
                                        (channel == CONTAINER_CHANNEL) ?
                                                "array created" :
                                                "enclosure services event");
                                scsi_device_set_state(device, SDEV_RUNNING);
                        }
                        /* FALLTHRU */
                case CHANGE:
                        if ((channel == CONTAINER_CHANNEL)
                         && (!dev->fsa_dev[container].valid)) {
#if (defined(AAC_DEBUG_INSTRUMENT_AIF_DELETE))
                                scsi_remove_device(device);
#else
                                if (!scsi_device_online(device))
                                        break;
                                scsi_device_set_state(device, SDEV_OFFLINE);
                                sdev_printk(KERN_INFO, device,
                                        "Device offlined - %s\n",
                                        "array failed");
#endif
                                break;
                        }
                        scsi_rescan_device(&device->sdev_gendev);

                default:
                        break;
                }
                scsi_device_put(device);
                device_config_needed = NOTHING;
        }
        if (device_config_needed == ADD)
                scsi_add_device(dev->scsi_host_ptr, channel, id, lun);
        if (channel == CONTAINER_CHANNEL) {
                container++;
                device_config_needed = NOTHING;
                goto retry_next;
        }
}

static int _aac_reset_adapter(struct aac_dev *aac, int forced)
{
        int index, quirks;
        int retval;
        struct Scsi_Host *host;
        struct scsi_device *dev;
        struct scsi_cmnd *command;
        struct scsi_cmnd *command_list;
        int jafo = 0;

        /*
         * Assumptions:
         *      - host is locked, unless called by the aacraid thread.
         *        (a matter of convenience, due to legacy issues surrounding
         *        eh_host_adapter_reset).
         *      - in_reset is asserted, so no new i/o is getting to the
         *        card.
         *      - The card is dead, or will be very shortly ;-/ so no new
         *        commands are completing in the interrupt service.
         */
        host = aac->scsi_host_ptr;
        scsi_block_requests(host);
        aac_adapter_disable_int(aac);
        if (aac->thread->pid != current->pid) {
                spin_unlock_irq(host->host_lock);
                kthread_stop(aac->thread);
                jafo = 1;
        }

        /*
         *      If a positive health, means in a known DEAD PANIC
         * state and the adapter could be reset to `try again'.
         */
        retval = aac_adapter_restart(aac, forced ? 0 : aac_adapter_check_health(aac));

        if (retval)
                goto out;

        /*
         *      Loop through the fibs, close the synchronous FIBS
         */
        for (retval = 1, index = 0; index < (aac->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB); index++) {
                struct fib *fib = &aac->fibs[index];
                if (!(fib->hw_fib_va->header.XferState & cpu_to_le32(NoResponseExpected | Async)) &&
                  (fib->hw_fib_va->header.XferState & cpu_to_le32(ResponseExpected))) {
                        unsigned long flagv;
                        spin_lock_irqsave(&fib->event_lock, flagv);
                        up(&fib->event_wait);
                        spin_unlock_irqrestore(&fib->event_lock, flagv);
                        schedule();
                        retval = 0;
                }
        }
        /* Give some extra time for ioctls to complete. */
        if (retval == 0)
                ssleep(2);
        index = aac->cardtype;

        /*
         * Re-initialize the adapter, first free resources, then carefully
         * apply the initialization sequence to come back again. Only risk
         * is a change in Firmware dropping cache, it is assumed the caller
         * will ensure that i/o is queisced and the card is flushed in that
         * case.
         */
        aac_fib_map_free(aac);
        pci_free_consistent(aac->pdev, aac->comm_size, aac->comm_addr, aac->comm_phys);
        aac->comm_addr = NULL;
        aac->comm_phys = 0;
        kfree(aac->queues);
        aac->queues = NULL;
        free_irq(aac->pdev->irq, aac);
        kfree(aac->fsa_dev);
        aac->fsa_dev = NULL;
        quirks = aac_get_driver_ident(index)->quirks;
        if (quirks & AAC_QUIRK_31BIT) {
                if (((retval = pci_set_dma_mask(aac->pdev, DMA_BIT_MASK(31)))) ||
                  ((retval = pci_set_consistent_dma_mask(aac->pdev, DMA_BIT_MASK(31)))))
                        goto out;
        } else {
                if (((retval = pci_set_dma_mask(aac->pdev, DMA_BIT_MASK(32)))) ||
                  ((retval = pci_set_consistent_dma_mask(aac->pdev, DMA_BIT_MASK(32)))))
                        goto out;
        }
        if ((retval = (*(aac_get_driver_ident(index)->init))(aac)))
                goto out;
        if (quirks & AAC_QUIRK_31BIT)
                if ((retval = pci_set_dma_mask(aac->pdev, DMA_BIT_MASK(32))))
                        goto out;
        if (jafo) {
                aac->thread = kthread_run(aac_command_thread, aac, aac->name);
                if (IS_ERR(aac->thread)) {
                        retval = PTR_ERR(aac->thread);
                        goto out;
                }
        }
        (void)aac_get_adapter_info(aac);
        if ((quirks & AAC_QUIRK_34SG) && (host->sg_tablesize > 34)) {
                host->sg_tablesize = 34;
                host->max_sectors = (host->sg_tablesize * 8) + 112;
        }
        if ((quirks & AAC_QUIRK_17SG) && (host->sg_tablesize > 17)) {
                host->sg_tablesize = 17;
                host->max_sectors = (host->sg_tablesize * 8) + 112;
        }
        aac_get_config_status(aac, 1);
        aac_get_containers(aac);
        /*
         * This is where the assumption that the Adapter is quiesced
         * is important.
         */
        command_list = NULL;
        __shost_for_each_device(dev, host) {
                unsigned long flags;
                spin_lock_irqsave(&dev->list_lock, flags);
                list_for_each_entry(command, &dev->cmd_list, list)
                        if (command->SCp.phase == AAC_OWNER_FIRMWARE) {
                                command->SCp.buffer = (struct scatterlist *)command_list;
                                command_list = command;
                        }
                spin_unlock_irqrestore(&dev->list_lock, flags);
        }
        while ((command = command_list)) {
                command_list = (struct scsi_cmnd *)command->SCp.buffer;
                command->SCp.buffer = NULL;
                command->result = DID_OK << 16
                  | COMMAND_COMPLETE << 8
                  | SAM_STAT_TASK_SET_FULL;
                command->SCp.phase = AAC_OWNER_ERROR_HANDLER;
                command->scsi_done(command);
        }
        retval = 0;

out:
        aac->in_reset = 0;
        scsi_unblock_requests(host);
        if (jafo) {
                spin_lock_irq(host->host_lock);
        }
        return retval;
}

int aac_reset_adapter(struct aac_dev * aac, int forced)
{
        unsigned long flagv = 0;
        int retval;
        struct Scsi_Host * host;

        if (spin_trylock_irqsave(&aac->fib_lock, flagv) == 0)
                return -EBUSY;

        if (aac->in_reset) {
                spin_unlock_irqrestore(&aac->fib_lock, flagv);
                return -EBUSY;
        }
        aac->in_reset = 1;
        spin_unlock_irqrestore(&aac->fib_lock, flagv);

        /*
         * Wait for all commands to complete to this specific
         * target (block maximum 60 seconds). Although not necessary,
         * it does make us a good storage citizen.
         */
        host = aac->scsi_host_ptr;
        scsi_block_requests(host);
        if (forced < 2) for (retval = 60; retval; --retval) {
                struct scsi_device * dev;
                struct scsi_cmnd * command;
                int active = 0;

                __shost_for_each_device(dev, host) {
                        spin_lock_irqsave(&dev->list_lock, flagv);
                        list_for_each_entry(command, &dev->cmd_list, list) {
                                if (command->SCp.phase == AAC_OWNER_FIRMWARE) {
                                        active++;
                                        break;
                                }
                        }
                        spin_unlock_irqrestore(&dev->list_lock, flagv);
                        if (active)
                                break;

                }
                /*
                 * We can exit If all the commands are complete
                 */
                if (active == 0)
                        break;
                ssleep(1);
        }

        /* Quiesce build, flush cache, write through mode */
        if (forced < 2)
                aac_send_shutdown(aac);
        spin_lock_irqsave(host->host_lock, flagv);
        retval = _aac_reset_adapter(aac, forced ? forced : ((aac_check_reset != 0) && (aac_check_reset != 1)));
        spin_unlock_irqrestore(host->host_lock, flagv);

        if ((forced < 2) && (retval == -ENODEV)) {
                /* Unwind aac_send_shutdown() IOP_RESET unsupported/disabled */
                struct fib * fibctx = aac_fib_alloc(aac);
                if (fibctx) {
                        struct aac_pause *cmd;
                        int status;

                        aac_fib_init(fibctx);

                        cmd = (struct aac_pause *) fib_data(fibctx);

                        cmd->command = cpu_to_le32(VM_ContainerConfig);
                        cmd->type = cpu_to_le32(CT_PAUSE_IO);
                        cmd->timeout = cpu_to_le32(1);
                        cmd->min = cpu_to_le32(1);
                        cmd->noRescan = cpu_to_le32(1);
                        cmd->count = cpu_to_le32(0);

                        status = aac_fib_send(ContainerCommand,
                          fibctx,
                          sizeof(struct aac_pause),
                          FsaNormal,
                          -2 /* Timeout silently */, 1,
                          NULL, NULL);

                        if (status >= 0)
                                aac_fib_complete(fibctx);
                        /* FIB should be freed only after getting
                         * the response from the F/W */
                        if (status != -ERESTARTSYS)
                                aac_fib_free(fibctx);
                }
        }

        return retval;
}

int aac_check_health(struct aac_dev * aac)
{
        int BlinkLED;
        unsigned long time_now, flagv = 0;
        struct list_head * entry;
        struct Scsi_Host * host;

        /* Extending the scope of fib_lock slightly to protect aac->in_reset */
        if (spin_trylock_irqsave(&aac->fib_lock, flagv) == 0)
                return 0;

        if (aac->in_reset || !(BlinkLED = aac_adapter_check_health(aac))) {
                spin_unlock_irqrestore(&aac->fib_lock, flagv);
                return 0; /* OK */
        }

        aac->in_reset = 1;

        /* Fake up an AIF:
         *      aac_aifcmd.command = AifCmdEventNotify = 1
         *      aac_aifcmd.seqnum = 0xFFFFFFFF
         *      aac_aifcmd.data[0] = AifEnExpEvent = 23
         *      aac_aifcmd.data[1] = AifExeFirmwarePanic = 3
         *      aac.aifcmd.data[2] = AifHighPriority = 3
         *      aac.aifcmd.data[3] = BlinkLED
         */

        time_now = jiffies/HZ;
        entry = aac->fib_list.next;

        /*
         * For each Context that is on the
         * fibctxList, make a copy of the
         * fib, and then set the event to wake up the
         * thread that is waiting for it.
         */
        while (entry != &aac->fib_list) {
                /*
                 * Extract the fibctx
                 */
                struct aac_fib_context *fibctx = list_entry(entry, struct aac_fib_context, next);
                struct hw_fib * hw_fib;
                struct fib * fib;
                /*
                 * Check if the queue is getting
                 * backlogged
                 */
                if (fibctx->count > 20) {
                        /*
                         * It's *not* jiffies folks,
                         * but jiffies / HZ, so do not
                         * panic ...
                         */
                        u32 time_last = fibctx->jiffies;
                        /*
                         * Has it been > 2 minutes
                         * since the last read off
                         * the queue?
                         */
                        if ((time_now - time_last) > aif_timeout) {
                                entry = entry->next;
                                aac_close_fib_context(aac, fibctx);
                                continue;
                        }
                }
                /*
                 * Warning: no sleep allowed while
                 * holding spinlock
                 */
                hw_fib = kzalloc(sizeof(struct hw_fib), GFP_ATOMIC);
                fib = kzalloc(sizeof(struct fib), GFP_ATOMIC);
                if (fib && hw_fib) {
                        struct aac_aifcmd * aif;

                        fib->hw_fib_va = hw_fib;
                        fib->dev = aac;
                        aac_fib_init(fib);
                        fib->type = FSAFS_NTC_FIB_CONTEXT;
                        fib->size = sizeof (struct fib);
                        fib->data = hw_fib->data;
                        aif = (struct aac_aifcmd *)hw_fib->data;
                        aif->command = cpu_to_le32(AifCmdEventNotify);
                        aif->seqnum = cpu_to_le32(0xFFFFFFFF);
                        ((__le32 *)aif->data)[0] = cpu_to_le32(AifEnExpEvent);
                        ((__le32 *)aif->data)[1] = cpu_to_le32(AifExeFirmwarePanic);
                        ((__le32 *)aif->data)[2] = cpu_to_le32(AifHighPriority);
                        ((__le32 *)aif->data)[3] = cpu_to_le32(BlinkLED);

                        /*
                         * Put the FIB onto the
                         * fibctx's fibs
                         */
                        list_add_tail(&fib->fiblink, &fibctx->fib_list);
                        fibctx->count++;
                        /*
                         * Set the event to wake up the
                         * thread that will waiting.
                         */
                        up(&fibctx->wait_sem);
                } else {
                        printk(KERN_WARNING "aifd: didn't allocate NewFib.\n");
                        kfree(fib);
                        kfree(hw_fib);
                }
                entry = entry->next;
        }

        spin_unlock_irqrestore(&aac->fib_lock, flagv);

        if (BlinkLED < 0) {
                printk(KERN_ERR "%s: Host adapter dead %d\n", aac->name, BlinkLED);
                goto out;
        }

        printk(KERN_ERR "%s: Host adapter BLINK LED 0x%x\n", aac->name, BlinkLED);

        if (!aac_check_reset || ((aac_check_reset == 1) &&
                (aac->supplement_adapter_info.SupportedOptions2 &
                        AAC_OPTION_IGNORE_RESET)))
                goto out;
        host = aac->scsi_host_ptr;
        if (aac->thread->pid != current->pid)
                spin_lock_irqsave(host->host_lock, flagv);
        BlinkLED = _aac_reset_adapter(aac, aac_check_reset != 1);
        if (aac->thread->pid != current->pid)
                spin_unlock_irqrestore(host->host_lock, flagv);
        return BlinkLED;

out:
        aac->in_reset = 0;
        return BlinkLED;
}


/**
 *      aac_command_thread      -       command processing thread
 *      @dev: Adapter to monitor
 *
 *      Waits on the commandready event in it's queue. When the event gets set
 *      it will pull FIBs off it's queue. It will continue to pull FIBs off
 *      until the queue is empty. When the queue is empty it will wait for
 *      more FIBs.
 */

int aac_command_thread(void *data)
{
        struct aac_dev *dev = data;
        struct hw_fib *hw_fib, *hw_newfib;
        struct fib *fib, *newfib;
        struct aac_fib_context *fibctx;
        unsigned long flags;
        DECLARE_WAITQUEUE(wait, current);
        unsigned long next_jiffies = jiffies + HZ;
        unsigned long next_check_jiffies = next_jiffies;
        long difference = HZ;

        /*
         *      We can only have one thread per adapter for AIF's.
         */
        if (dev->aif_thread)
                return -EINVAL;

        /*
         *      Let the DPC know it has a place to send the AIF's to.
         */
        dev->aif_thread = 1;
        add_wait_queue(&dev->queues->queue[HostNormCmdQueue].cmdready, &wait);
        set_current_state(TASK_INTERRUPTIBLE);
        dprintk ((KERN_INFO "aac_command_thread start\n"));
        while (1) {
                spin_lock_irqsave(dev->queues->queue[HostNormCmdQueue].lock, flags);
                while(!list_empty(&(dev->queues->queue[HostNormCmdQueue].cmdq))) {
                        struct list_head *entry;
                        struct aac_aifcmd * aifcmd;

                        set_current_state(TASK_RUNNING);

                        entry = dev->queues->queue[HostNormCmdQueue].cmdq.next;
                        list_del(entry);

                        spin_unlock_irqrestore(dev->queues->queue[HostNormCmdQueue].lock, flags);
                        fib = list_entry(entry, struct fib, fiblink);
                        /*
                         *      We will process the FIB here or pass it to a
                         *      worker thread that is TBD. We Really can't
                         *      do anything at this point since we don't have
                         *      anything defined for this thread to do.
                         */
                        hw_fib = fib->hw_fib_va;
                        memset(fib, 0, sizeof(struct fib));
                        fib->type = FSAFS_NTC_FIB_CONTEXT;
                        fib->size = sizeof(struct fib);
                        fib->hw_fib_va = hw_fib;
                        fib->data = hw_fib->data;
                        fib->dev = dev;
                        /*
                         *      We only handle AifRequest fibs from the adapter.
                         */
                        aifcmd = (struct aac_aifcmd *) hw_fib->data;
                        if (aifcmd->command == cpu_to_le32(AifCmdDriverNotify)) {
                                /* Handle Driver Notify Events */
                                aac_handle_aif(dev, fib);
                                *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
                                aac_fib_adapter_complete(fib, (u16)sizeof(u32));
                        } else {
                                /* The u32 here is important and intended. We are using
                                   32bit wrapping time to fit the adapter field */

                                u32 time_now, time_last;
                                unsigned long flagv;
                                unsigned num;
                                struct hw_fib ** hw_fib_pool, ** hw_fib_p;
                                struct fib ** fib_pool, ** fib_p;

                                /* Sniff events */
                                if ((aifcmd->command ==
                                     cpu_to_le32(AifCmdEventNotify)) ||
                                    (aifcmd->command ==
                                     cpu_to_le32(AifCmdJobProgress))) {
                                        aac_handle_aif(dev, fib);
                                }

                                time_now = jiffies/HZ;

                                /*
                                 * Warning: no sleep allowed while
                                 * holding spinlock. We take the estimate
                                 * and pre-allocate a set of fibs outside the
                                 * lock.
                                 */
                                num = le32_to_cpu(dev->init->AdapterFibsSize)
                                    / sizeof(struct hw_fib); /* some extra */
                                spin_lock_irqsave(&dev->fib_lock, flagv);
                                entry = dev->fib_list.next;
                                while (entry != &dev->fib_list) {
                                        entry = entry->next;
                                        ++num;
                                }
                                spin_unlock_irqrestore(&dev->fib_lock, flagv);
                                hw_fib_pool = NULL;
                                fib_pool = NULL;
                                if (num
                                 && ((hw_fib_pool = kmalloc(sizeof(struct hw_fib *) * num, GFP_KERNEL)))
                                 && ((fib_pool = kmalloc(sizeof(struct fib *) * num, GFP_KERNEL)))) {
                                        hw_fib_p = hw_fib_pool;
                                        fib_p = fib_pool;
                                        while (hw_fib_p < &hw_fib_pool[num]) {
                                                if (!(*(hw_fib_p++) = kmalloc(sizeof(struct hw_fib), GFP_KERNEL))) {
                                                        --hw_fib_p;
                                                        break;
                                                }
                                                if (!(*(fib_p++) = kmalloc(sizeof(struct fib), GFP_KERNEL))) {
                                                        kfree(*(--hw_fib_p));
                                                        break;
                                                }
                                        }
                                        if ((num = hw_fib_p - hw_fib_pool) == 0) {
                                                kfree(fib_pool);
                                                fib_pool = NULL;
                                                kfree(hw_fib_pool);
                                                hw_fib_pool = NULL;
                                        }
                                } else {
                                        kfree(hw_fib_pool);
                                        hw_fib_pool = NULL;
                                }
                                spin_lock_irqsave(&dev->fib_lock, flagv);
                                entry = dev->fib_list.next;
                                /*
                                 * For each Context that is on the
                                 * fibctxList, make a copy of the
                                 * fib, and then set the event to wake up the
                                 * thread that is waiting for it.
                                 */
                                hw_fib_p = hw_fib_pool;
                                fib_p = fib_pool;
                                while (entry != &dev->fib_list) {
                                        /*
                                         * Extract the fibctx
                                         */
                                        fibctx = list_entry(entry, struct aac_fib_context, next);
                                        /*
                                         * Check if the queue is getting
                                         * backlogged
                                         */
                                        if (fibctx->count > 20)
                                        {
                                                /*
                                                 * It's *not* jiffies folks,
                                                 * but jiffies / HZ so do not
                                                 * panic ...
                                                 */
                                                time_last = fibctx->jiffies;
                                                /*
                                                 * Has it been > 2 minutes
                                                 * since the last read off
                                                 * the queue?
                                                 */
                                                if ((time_now - time_last) > aif_timeout) {
                                                        entry = entry->next;
                                                        aac_close_fib_context(dev, fibctx);
                                                        continue;
                                                }
                                        }
                                        /*
                                         * Warning: no sleep allowed while
                                         * holding spinlock
                                         */
                                        if (hw_fib_p < &hw_fib_pool[num]) {
                                                hw_newfib = *hw_fib_p;
                                                *(hw_fib_p++) = NULL;
                                                newfib = *fib_p;
                                                *(fib_p++) = NULL;
                                                /*
                                                 * Make the copy of the FIB
                                                 */
                                                memcpy(hw_newfib, hw_fib, sizeof(struct hw_fib));
                                                memcpy(newfib, fib, sizeof(struct fib));
                                                newfib->hw_fib_va = hw_newfib;
                                                /*
                                                 * Put the FIB onto the
                                                 * fibctx's fibs
                                                 */
                                                list_add_tail(&newfib->fiblink, &fibctx->fib_list);
                                                fibctx->count++;
                                                /*
                                                 * Set the event to wake up the
                                                 * thread that is waiting.
                                                 */
                                                up(&fibctx->wait_sem);
                                        } else {
                                                printk(KERN_WARNING "aifd: didn't allocate NewFib.\n");
                                        }
                                        entry = entry->next;
                                }
                                /*
                                 *      Set the status of this FIB
                                 */
                                *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
                                aac_fib_adapter_complete(fib, sizeof(u32));
                                spin_unlock_irqrestore(&dev->fib_lock, flagv);
                                /* Free up the remaining resources */
                                hw_fib_p = hw_fib_pool;
                                fib_p = fib_pool;
                                while (hw_fib_p < &hw_fib_pool[num]) {
                                        kfree(*hw_fib_p);
                                        kfree(*fib_p);
                                        ++fib_p;
                                        ++hw_fib_p;
                                }
                                kfree(hw_fib_pool);
                                kfree(fib_pool);
                        }
                        kfree(fib);
                        spin_lock_irqsave(dev->queues->queue[HostNormCmdQueue].lock, flags);
                }
                /*
                 *      There are no more AIF's
                 */
                spin_unlock_irqrestore(dev->queues->queue[HostNormCmdQueue].lock, flags);

                /*
                 *      Background activity
                 */
                if ((time_before(next_check_jiffies,next_jiffies))
                 && ((difference = next_check_jiffies - jiffies) <= 0)) {
                        next_check_jiffies = next_jiffies;
                        if (aac_check_health(dev) == 0) {
                                difference = ((long)(unsigned)check_interval)
                                           * HZ;
                                next_check_jiffies = jiffies + difference;
                        } else if (!dev->queues)
                                break;
                }
                if (!time_before(next_check_jiffies,next_jiffies)
                 && ((difference = next_jiffies - jiffies) <= 0)) {
                        struct timeval now;
                        int ret;

                        /* Don't even try to talk to adapter if its sick */
                        ret = aac_check_health(dev);
                        if (!ret && !dev->queues)
                                break;
                        next_check_jiffies = jiffies
                                           + ((long)(unsigned)check_interval)
                                           * HZ;
                        do_gettimeofday(&now);

                        /* Synchronize our watches */
                        if (((1000000 - (1000000 / HZ)) > now.tv_usec)
                         && (now.tv_usec > (1000000 / HZ)))
                                difference = (((1000000 - now.tv_usec) * HZ)
                                  + 500000) / 1000000;
                        else if (ret == 0) {
                                struct fib *fibptr;

                                if ((fibptr = aac_fib_alloc(dev))) {
                                        int status;
                                        __le32 *info;

                                        aac_fib_init(fibptr);

                                        info = (__le32 *) fib_data(fibptr);
                                        if (now.tv_usec > 500000)
                                                ++now.tv_sec;

                                        *info = cpu_to_le32(now.tv_sec);

                                        status = aac_fib_send(SendHostTime,
                                                fibptr,
                                                sizeof(*info),
                                                FsaNormal,
                                                1, 1,
                                                NULL,
                                                NULL);
                                        /* Do not set XferState to zero unless
                                         * receives a response from F/W */
                                        if (status >= 0)
                                                aac_fib_complete(fibptr);
                                        /* FIB should be freed only after
                                         * getting the response from the F/W */
                                        if (status != -ERESTARTSYS)
                                                aac_fib_free(fibptr);
                                }
                                difference = (long)(unsigned)update_interval*HZ;
                        } else {
                                /* retry shortly */
                                difference = 10 * HZ;
                        }
                        next_jiffies = jiffies + difference;
                        if (time_before(next_check_jiffies,next_jiffies))
                                difference = next_check_jiffies - jiffies;
                }
                if (difference <= 0)
                        difference = 1;
                set_current_state(TASK_INTERRUPTIBLE);
                schedule_timeout(difference);

                if (kthread_should_stop())
                        break;
        }
        if (dev->queues)
                remove_wait_queue(&dev->queues->queue[HostNormCmdQueue].cmdready, &wait);
        dev->aif_thread = 0;
        return 0;
}