MOXA linux-2.6.x / linux-2.6.9-uc0 from sdlinux-moxaart.tgz

[linux-2.6.9-moxart.git] / drivers / scsi / aacraid / commsup.c

/*
 *      Adaptec AAC series RAID controller driver
 *      (c) Copyright 2001 Red Hat Inc. <alan@redhat.com>
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.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
 *    commuication.
 *
 */

#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 <asm/semaphore.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)
{
        if((dev->hw_fib_va = pci_alloc_consistent(dev->pdev, sizeof(struct hw_fib) * AAC_NUM_FIB, &dev->hw_fib_pa))==NULL)
                return -ENOMEM;
        return 0;
}

/**
 *      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 fib_map_free(struct aac_dev *dev)
{
        pci_free_consistent(dev->pdev, sizeof(struct hw_fib) * AAC_NUM_FIB, dev->hw_fib_va, dev->hw_fib_pa);
}

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

int fib_setup(struct aac_dev * dev)
{
        struct fib *fibptr;
        struct hw_fib *hw_fib_va;
        dma_addr_t hw_fib_pa;
        int i;
        
        if(fib_map_alloc(dev)<0)
                return -ENOMEM;
                
        hw_fib_va = dev->hw_fib_va;
        hw_fib_pa = dev->hw_fib_pa;
        memset(hw_fib_va, 0, sizeof(struct hw_fib) * AAC_NUM_FIB);
        /*
         *      Initialise the fibs
         */
        for (i = 0, fibptr = &dev->fibs[i]; i < AAC_NUM_FIB; i++, fibptr++) 
        {
                fibptr->dev = dev;
                fibptr->hw_fib = hw_fib_va;
                fibptr->data = (void *) fibptr->hw_fib->data;
                fibptr->next = fibptr+1;        /* Forward chain the fibs */
                init_MUTEX_LOCKED(&fibptr->event_wait);
                spin_lock_init(&fibptr->event_lock);
                hw_fib_va->header.XferState = cpu_to_le32(0xffffffff);
                hw_fib_va->header.SenderSize = cpu_to_le16(sizeof(struct hw_fib));
                fibptr->hw_fib_pa = hw_fib_pa;
                hw_fib_va = (struct hw_fib *)((unsigned char *)hw_fib_va + sizeof(struct hw_fib));
                hw_fib_pa = hw_fib_pa + sizeof(struct hw_fib); 
        }
        /*
         *      Add the fib chain to the free list
         */
        dev->fibs[AAC_NUM_FIB-1].next = NULL;
        /*
         *      Enable this to debug out of queue space
         */
        dev->free_fib = &dev->fibs[0];
        return 0;
}

/**
 *      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
 *      wait for fibs to become free.
 */
 
struct fib * fib_alloc(struct aac_dev *dev)
{
        struct fib * fibptr;
        unsigned long flags;
        spin_lock_irqsave(&dev->fib_lock, flags);
        fibptr = dev->free_fib; 
        /* Cannot sleep here or you get hangs. Instead we did the
           maths at compile time. */
        if(!fibptr)
                BUG();
        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->header.XferState = cpu_to_le32(0);
        fibptr->callback = NULL;
        fibptr->callback_data = NULL;

        return fibptr;
}

/**
 *      fib_free        -       free a fib
 *      @fibptr: fib to free up
 *
 *      Frees up a fib and places it on the appropriate queue
 *      (either free or timed out)
 */
 
void fib_free(struct fib * fibptr)
{
        unsigned long flags;

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

/**
 *      fib_init        -       initialise a fib
 *      @fibptr: The fib to initialize
 *      
 *      Set up the generic fib fields ready for use
 */
 
void fib_init(struct fib *fibptr)
{
        struct hw_fib *hw_fib = fibptr->hw_fib;

        hw_fib->header.StructType = FIB_MAGIC;
        hw_fib->header.Size = cpu_to_le16(sizeof(struct hw_fib));
        hw_fib->header.XferState = cpu_to_le32(HostOwned | FibInitialized | FibEmpty | FastResponseCapable);
        hw_fib->header.SenderFibAddress = cpu_to_le32(fibptr->hw_fib_pa);
        hw_fib->header.ReceiverFibAddress = cpu_to_le32(fibptr->hw_fib_pa);
        hw_fib->header.SenderSize = cpu_to_le16(sizeof(struct hw_fib));
}

/**
 *      fib_deallocate          -       deallocate a fib
 *      @fibptr: fib to deallocate
 *
 *      Will deallocate and return to the free pool the FIB pointed to by the
 *      caller.
 */
 
void fib_dealloc(struct fib * fibptr)
{
        struct hw_fib *hw_fib = fibptr->hw_fib;
        if(hw_fib->header.StructType != FIB_MAGIC) 
                BUG();
        hw_fib->header.XferState = cpu_to_le32(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;

        /*
         *      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];
        
        *index = le32_to_cpu(*(q->headers.producer));
        if ((*index - 2) == le32_to_cpu(*(q->headers.consumer)))
                        *nonotify = 1; 

        if (qid == AdapHighCmdQueue) {
                if (*index >= ADAP_HIGH_CMD_ENTRIES)
                        *index = 0;
        } else if (qid == AdapNormCmdQueue) {
                if (*index >= ADAP_NORM_CMD_ENTRIES) 
                        *index = 0; /* Wrap to front of the Producer Queue. */
        }
        else if (qid == AdapHighRespQueue) 
        {
                if (*index >= ADAP_HIGH_RESP_ENTRIES)
                        *index = 0;
        }
        else if (qid == AdapNormRespQueue) 
        {
                if (*index >= ADAP_NORM_RESP_ENTRIES) 
                        *index = 0; /* Wrap to front of the Producer Queue. */
        }
        else {
                printk("aacraid: invalid qid\n");
                BUG();
        }

        if ((*index + 1) == le32_to_cpu(*(q->headers.consumer))) { /* Queue is full */
                printk(KERN_WARNING "Queue %d full, %d 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.
 */

static 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;
        struct aac_queue * q = &dev->queues->queue[qid];
                
        spin_lock_irqsave(q->lock, q->SavedIrql);
            
        if (qid == AdapHighCmdQueue || 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 if (qid == AdapHighRespQueue || qid == AdapNormRespQueue)
        {
                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 = fibptr->hw_fib_pa;
        return 0;
}


/**
 *      aac_insert_entry        -       insert a queue entry
 *      @dev: Adapter
 *      @index: Index of entry to insert
 *      @qid: Queue number
 *      @nonotify: Suppress adapter notification
 *
 *      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.
 */
 
static int aac_insert_entry(struct aac_dev * dev, u32 index, u32 qid, unsigned long nonotify) 
{
        struct aac_queue * q = &dev->queues->queue[qid];

        if(q == NULL)
                BUG();
        *(q->headers.producer) = cpu_to_le32(index + 1);
        spin_unlock_irqrestore(q->lock, q->SavedIrql);

        if (qid == AdapHighCmdQueue ||
            qid == AdapNormCmdQueue ||
            qid == AdapHighRespQueue ||
            qid == AdapNormRespQueue)
        {
                if (!nonotify)
                        aac_adapter_notify(dev, qid);
        }
        else
                printk("Suprise insert!\n");
        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.
 */

/**
 *      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 fib_send(u16 command, struct fib * fibptr, unsigned long size,  int priority, int wait, int reply, fib_callback callback, void * callback_data)
{
        u32 index;
        u32 qid;
        struct aac_dev * dev = fibptr->dev;
        unsigned long nointr = 0;
        struct hw_fib * hw_fib = fibptr->hw_fib;
        struct aac_queue * q;
        unsigned long flags = 0;
        if (!(le32_to_cpu(hw_fib->header.XferState) & HostOwned))
                return -EBUSY;
        /*
         *      There are 5 cases with the wait and reponse 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 Fibis 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.
         */
        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)) << 1);
        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->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.
         */
        if (priority == FsaHigh) {
                hw_fib->header.XferState |= cpu_to_le32(HighPriority);
                qid = AdapHighCmdQueue;
        } else {
                hw_fib->header.XferState |= cpu_to_le32(NormalPriority);
                qid = AdapNormCmdQueue;
        }
        q = &dev->queues->queue[qid];

        if(wait)
                spin_lock_irqsave(&fibptr->event_lock, flags);
        if(aac_queue_get( dev, &index, qid, hw_fib, 1, fibptr, &nointr)<0)
                return -EWOULDBLOCK;
        dprintk((KERN_DEBUG "fib_send: inserting a queue entry at index %d.\n",index));
        dprintk((KERN_DEBUG "Fib contents:.\n"));
        dprintk((KERN_DEBUG "  Command =               %d.\n", hw_fib->header.Command));
        dprintk((KERN_DEBUG "  XferState  =            %x.\n", hw_fib->header.XferState));
        dprintk((KERN_DEBUG "  hw_fib va being sent=%p\n",fibptr->hw_fib));
        dprintk((KERN_DEBUG "  hw_fib pa being sent=%lx\n",(ulong)fibptr->hw_fib_pa));
        dprintk((KERN_DEBUG "  fib being sent=%p\n",fibptr));
        /*
         *      Fill in the Callback and CallbackContext if we are not
         *      going to wait.
         */
        if (!wait) {
                fibptr->callback = callback;
                fibptr->callback_data = callback_data;
        }
        FIB_COUNTER_INCREMENT(aac_config.FibsSent);
        list_add_tail(&fibptr->queue, &q->pendingq);
        q->numpending++;

        fibptr->done = 0;
        fibptr->flags = 0;

        if(aac_insert_entry(dev, index, qid, (nointr & aac_config.irq_mod)) < 0)
                return -EWOULDBLOCK;
        /*
         *      If the caller wanted us to wait for response wait now. 
         */
    
        if (wait) {
                spin_unlock_irqrestore(&fibptr->event_lock, flags);
                down(&fibptr->event_wait);
                if(fibptr->done == 0)
                        BUG();
                        
                if((fibptr->flags & FIB_CONTEXT_FLAG_TIMED_OUT)){
                        return -ETIMEDOUT;
                } else {
                        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);
}

int aac_consumer_avail(struct aac_dev *dev, struct aac_queue * q)
{
        return (le32_to_cpu(*q->headers.producer) != le32_to_cpu(*q->headers.consumer));
}


/**
 *      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
                *q->headers.consumer = cpu_to_le32(le32_to_cpu(*q->headers.consumer)+1);
        
        if (wasfull) {
                switch (qid) {

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

/**
 *      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 fib_adapter_complete(struct fib * fibptr, unsigned short size)
{
        struct hw_fib * hw_fib = fibptr->hw_fib;
        struct aac_dev * dev = fibptr->dev;
        unsigned long nointr = 0;
        if (le32_to_cpu(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 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)) {
                hw_fib->header.XferState |= cpu_to_le32(HostProcessed);
                if (hw_fib->header.XferState & cpu_to_le32(HighPriority)) {
                        u32 index;
                        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);
                        }
                        if(aac_queue_get(dev, &index, AdapHighRespQueue, hw_fib, 1, NULL, &nointr) < 0) {
                                return -EWOULDBLOCK;
                        }
                        if (aac_insert_entry(dev, index, AdapHighRespQueue,  (nointr & (int)aac_config.irq_mod)) != 0) {
                        }
                }
                else if (hw_fib->header.XferState & NormalPriority) 
                {
                        u32 index;

                        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);
                        }
                        if (aac_queue_get(dev, &index, AdapNormRespQueue, hw_fib, 1, NULL, &nointr) < 0) 
                                return -EWOULDBLOCK;
                        if (aac_insert_entry(dev, index, AdapNormRespQueue, (nointr & (int)aac_config.irq_mod)) != 0) 
                        {
                        }
                }
        }
        else 
        {
                printk(KERN_WARNING "fib_adapter_complete: Unknown xferstate detected.\n");
                BUG();
        }   
        return 0;
}

/**
 *      fib_complete    -       fib completion handler
 *      @fib: FIB to complete
 *
 *      Will do all necessary work to complete a FIB.
 */
 
int fib_complete(struct fib * fibptr)
{
        struct hw_fib * hw_fib = fibptr->hw_fib;

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

        if (hw_fib->header.XferState == cpu_to_le32(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.
         */
        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)
{
        int length = val & 0xffff;
        int level = (val >> 16) & 0xffff;
        char *cp = dev->printfbuf;
        
        /*
         *      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 "aacraid:%s", cp);
        else
                printk(KERN_INFO "aacraid:%s", 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.
 */

static void aac_handle_aif(struct aac_dev * dev, struct fib * fibptr)
{
        struct hw_fib * hw_fib = fibptr->hw_fib;
        /*
         * Set the status of this FIB to be Invalid parameter.
         *
         *      *(u32 *)fib->data = ST_INVAL;
         */
        *(u32 *)hw_fib->data = cpu_to_le32(ST_OK);
        fib_adapter_complete(fibptr, sizeof(u32));
}

/**
 *      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(struct aac_dev * dev)
{
        struct hw_fib *hw_fib, *hw_newfib;
        struct fib *fib, *newfib;
        struct aac_queue_block *queues = dev->queues;
        struct aac_fib_context *fibctx;
        unsigned long flags;
        DECLARE_WAITQUEUE(wait, current);

        /*
         *      We can only have one thread per adapter for AIF's.
         */
        if (dev->aif_thread)
                return -EINVAL;
        /*
         *      Set up the name that will appear in 'ps'
         *      stored in  task_struct.comm[16].
         */
        daemonize("aacraid");
        allow_signal(SIGKILL);
        /*
         *      Let the DPC know it has a place to send the AIF's to.
         */
        dev->aif_thread = 1;
        add_wait_queue(&queues->queue[HostNormCmdQueue].cmdready, &wait);
        set_current_state(TASK_INTERRUPTIBLE);
        while(1) 
        {
                spin_lock_irqsave(queues->queue[HostNormCmdQueue].lock, flags);
                while(!list_empty(&(queues->queue[HostNormCmdQueue].cmdq))) {
                        struct list_head *entry;
                        struct aac_aifcmd * aifcmd;

                        set_current_state(TASK_RUNNING);
                
                        entry = queues->queue[HostNormCmdQueue].cmdq.next;
                        list_del(entry);
                        
                        spin_unlock_irqrestore(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;
                        memset(fib, 0, sizeof(struct fib));
                        fib->type = FSAFS_NTC_FIB_CONTEXT;
                        fib->size = sizeof( struct fib );
                        fib->hw_fib = 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);
                                *(u32 *)hw_fib->data = cpu_to_le32(ST_OK);
                                fib_adapter_complete(fib, sizeof(u32));
                        } else {
                                struct list_head *entry;
                                /* 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;
                                
                                /* Sniff events */
                                if (aifcmd->command == cpu_to_le32(AifCmdEventNotify))
                                        aac_handle_aif(dev, fib);
                                
                                time_now = jiffies/HZ;

                                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.
                                 */
                                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) > 120) {
                                                        entry = entry->next;
                                                        aac_close_fib_context(dev, fibctx);
                                                        continue;
                                                }
                                        }
                                        /*
                                         * Warning: no sleep allowed while
                                         * holding spinlock
                                         */
                                        hw_newfib = kmalloc(sizeof(struct hw_fib), GFP_ATOMIC);
                                        newfib = kmalloc(sizeof(struct fib), GFP_ATOMIC);
                                        if (newfib && hw_newfib) {
                                                /*
                                                 * Make the copy of the FIB
                                                 */
                                                memcpy(hw_newfib, hw_fib, sizeof(struct hw_fib));
                                                memcpy(newfib, fib, sizeof(struct fib));
                                                newfib->hw_fib = 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 will waiting.
                                                 */
                                                up(&fibctx->wait_sem);
                                        } else {
                                                printk(KERN_WARNING "aifd: didn't allocate NewFib.\n");
                                                if(newfib)
                                                        kfree(newfib);
                                                if(hw_newfib)
                                                        kfree(hw_newfib);
                                        }
                                        entry = entry->next;
                                }
                                /*
                                 *      Set the status of this FIB
                                 */
                                *(u32 *)hw_fib->data = cpu_to_le32(ST_OK);
                                fib_adapter_complete(fib, sizeof(u32));
                                spin_unlock_irqrestore(&dev->fib_lock, flagv);
                        }
                        spin_lock_irqsave(queues->queue[HostNormCmdQueue].lock, flags);
                        kfree(fib);
                }
                /*
                 *      There are no more AIF's
                 */
                spin_unlock_irqrestore(queues->queue[HostNormCmdQueue].lock, flags);
                schedule();

                if(signal_pending(current))
                        break;
                set_current_state(TASK_INTERRUPTIBLE);
        }
        remove_wait_queue(&queues->queue[HostNormCmdQueue].cmdready, &wait);
        dev->aif_thread = 0;
        complete_and_exit(&dev->aif_completion, 0);
}