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/*
 *	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/config.h>
#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 <asm/semaphore.h>
#include <linux/blk.h>
#include <asm/uaccess.h>
#include "scsi.h"
#include "hosts.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;	
	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 = 0; /* Filled in later if needed */
	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 BUG();
 
        if (*index + 1 == le32_to_cpu(*(q->headers.consumer))) { /* Queue is full */
		printk(KERN_WARNING "Queue %d full, %ld 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_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.
 */
 
#define CONTAINER_TO_BUS(cont)		(0)
#define CONTAINER_TO_TARGET(cont)	((cont))
#define CONTAINER_TO_LUN(cont)		(0)
 
static void aac_handle_aif(struct aac_dev * dev, struct fib * fibptr)
{
	struct hw_fib * hw_fib = fibptr->hw_fib;
	struct aac_aifcmd * aifcmd = (struct aac_aifcmd *)hw_fib->data;
	int busy;
	u32 container;
 
	/* Sniff for container changes */
	dprintk ((KERN_INFO "AifCmdDriverNotify=%x\n", le32_to_cpu(*(u32 *)aifcmd->data)));
	switch (le32_to_cpu(*(u32 *)aifcmd->data)) {
	case AifDenMorphComplete:
	case AifDenVolumeExtendComplete:
	case AifEnContainerChange: /* Not really a driver notify Event */
 
		busy = 0;
		container = le32_to_cpu(((u32 *)aifcmd->data)[1]);
		dprintk ((KERN_INFO "container=%d(%d,%d,%d,%d) ",
		  container,
		  (dev && dev->scsi_host_ptr)
		    ? dev->scsi_host_ptr->host_no
		    : -1,
		  CONTAINER_TO_BUS(container),
		  CONTAINER_TO_TARGET(container),
		  CONTAINER_TO_LUN(container)));
 
		/*
		 *	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 != (struct aac_dev *)NULL)
		 && (dev->scsi_host_ptr != (struct Scsi_Host *)NULL)) {
			Scsi_Device * device;
 
			for (device = dev->scsi_host_ptr->host_queue;
			  device != (Scsi_Device *)NULL;
			  device = device->next) {
				dprintk((KERN_INFO
				  "aifd: device (%d,%d,%d,%d)?\n",
				  dev->scsi_host_ptr->host_no,
				  device->channel,
				  device->id,
				  device->lun));
				if ((device->channel == CONTAINER_TO_BUS(container))
				 && (device->id == CONTAINER_TO_TARGET(container))
				 && (device->lun == CONTAINER_TO_LUN(container))) {
					busy |= (device->access_count != 0);
					if (busy == 0) {
						device->removable = TRUE;
					}
				}
			}
		}
		dprintk (("busy=%d\n", busy));
 
		/*
		 * if (busy == 0) {
		 *	scan_scsis(dev->scsi_host_ptr, 1,
		 *	  CONTAINER_TO_BUS(container),
		 *	  CONTAINER_TO_TARGET(container),
		 *	  CONTAINER_TO_LUN(container));
		 * }
		 * is not exported as accessible, so we need to go around it
		 * another way. So, we look for the "proc/scsi/scsi" entry in
		 * the proc filesystem (using proc_scsi as a shortcut) and send
		 * it a message. This deals with new devices that have
		 * appeared. If the device has gone offline, scan_scsis will
		 * also discover this, but we do not want the device to
		 * go away. We need to check the access_count for the
		 * device since we are not wanting the devices to go away.
		 */
		if ((busy == 0)
		 && (proc_scsi != (struct proc_dir_entry *)NULL)) {
			struct proc_dir_entry * entry;
 
			dprintk((KERN_INFO "proc_scsi=%p ", proc_scsi));
			for (entry = proc_scsi->subdir;
			  entry != (struct proc_dir_entry *)NULL;
			  entry = entry->next) {
				dprintk(("\"%.*s\"[%d]=%x ", entry->namelen,
				  entry->name, entry->namelen, entry->low_ino));
				if ((entry->low_ino != 0)
				 && (entry->namelen == 4)
				 && (memcmp ("scsi", entry->name, 4) == 0)) {
					dprintk(("%p->write_proc=%p ", entry, entry->write_proc));
					if (entry->write_proc != (int (*)(struct file *, const char *, unsigned long, void *))NULL) {
						char buffer[80];
						int length;
						mm_segment_t fs;
 
						sprintf (buffer,
						  "scsi add-single-device %d %d %d %d\n",
						  dev->scsi_host_ptr->host_no,
						  CONTAINER_TO_BUS(container),
						  CONTAINER_TO_TARGET(container),
						  CONTAINER_TO_LUN(container));
						length = strlen (buffer);
						dprintk((KERN_INFO
						  "echo %.*s > /proc/scsi/scsi\n",
						  length-1,
						  buffer));
						fs = get_fs();
						set_fs(get_ds());
						length = entry->write_proc(
						  NULL, buffer, length, NULL);
						set_fs(fs);
						dprintk((KERN_INFO
						  "returns %d\n", length));
					}
					break;
				}
			}
		}
	}
}
 
/**
 *	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].
	 */
	sprintf(current->comm, "aacraid");
	daemonize();
	/*
	 *	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);
	dprintk ((KERN_INFO "aac_command_thread start\n"));
	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
						 * FIXME: check if we need to fix other fields up
						 */
						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);
}