aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/scsi/aacraid/commsup.c
blob: 69985b08a270944512ca313f05c9b23fdabd6bad (plain) (tree)
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687


























                                                                        
                    











                             
                           
                             













                                                                        






                                                                                  













                                                                     
                                                                                                                                              















                                                                          






                                                                                                               



                                   
                                                                                                    


                                   
                                                                                                                  






                                                                            
                                                                      
                                                                              
                                              

                                                                                              



                                                  
                                                                                   











                                                                         
                    







                                                 



                                                              


























































                                                                                                           

                                                                                                            

                                                                           
                                                                           









                                                                             
                                            





























                                                                                                                        
                          








                                                                              














                                                                        
                                       
         























                                                                                      
                                                                       

























































































































































































































































































































































































                                                                                                                                                    

                                                              


















































































                                                                                                                      
                                  

















                                                                  


                            





































































































































































































































































                                                                                                      













                                                                              


















                                                                     
                                                                              
                                              
                                                           

                 

                                                                                    



                                                        

                                                                               
                                        

                                                                                                 



















                                                                                 
                                                         

                                                                             






                                                                                       


                                                                          








                                                                       

                                                      









































                                                                                                                    







                                                                             

                                                       































                                                                                                 




                                                                           













                                                                                                   
                                                                          



                                                                                                       





                                                                  
                                                                             

                                                                              














                                                                      
                         
                                   
                                                                                            



                                               
                                                                                         





                                                      

                                                                                         

                                                   
                 
 
/*
 *	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
 *    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 <scsi/scsi_host.h>
#include <scsi/scsi_device.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)
{
	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));
	if((dev->hw_fib_va = pci_alloc_consistent(dev->pdev, dev->max_fib_size
	  * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_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, dev->max_fib_size * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_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;

	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;
		
	hw_fib_va = dev->hw_fib_va;
	hw_fib_pa = dev->hw_fib_pa;
	memset(hw_fib_va, 0, dev->max_fib_size * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB));
	/*
	 *	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 = 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(dev->max_fib_size);
		fibptr->hw_fib_pa = hw_fib_pa;
		hw_fib_va = (struct hw_fib *)((unsigned char *)hw_fib_va + dev->max_fib_size);
		hw_fib_pa = hw_fib_pa + dev->max_fib_size;
	}
	/*
	 *	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;
}

/**
 *	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 * 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->header.XferState = 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, 
				 le32_to_cpu(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(fibptr->dev->max_fib_size);
	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(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;
	if(hw_fib->header.StructType != FIB_MAGIC) 
		BUG();
	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 == AdapHighCmdQueue)
				idx = ADAP_HIGH_CMD_ENTRIES;
			else if (qid == AdapNormCmdQueue)
				idx = ADAP_NORM_CMD_ENTRIES;
			else if (qid == AdapHighRespQueue) 
	        		idx = ADAP_HIGH_RESP_ENTRIES;
			else if (qid == AdapNormRespQueue) 
				idx = ADAP_NORM_RESP_ENTRIES;
		}
		if (idx != 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, %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.
 */

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 = cpu_to_le32(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 (!(hw_fib->header.XferState & cpu_to_le32(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 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.
	 */
	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);
}

/**
 *	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 (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 & 
				cpu_to_le32(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 == 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)
{
	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 "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;
	struct aac_aifcmd * aifcmd = (struct aac_aifcmd *)hw_fib->data;
	int busy;
	u32 container;
	struct scsi_device *device;
	enum {
		NOTHING,
		DELETE,
		ADD,
		CHANGE
	} device_config_needed;

	/* Sniff for container changes */

	if (!dev)
		return;
	container = (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(((u32 *)aifcmd->data)[0])) {
		/*
		 *	Morph or Expand complete
		 */
		case AifDenMorphComplete:
		case AifDenVolumeExtendComplete:
			container = le32_to_cpu(((u32 *)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;
					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(*(u32 *)aifcmd->data))
				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(*(u32 *)aifcmd->data))
				dev->fsa_dev[container].config_waiting_on = 0;
		}
		break;

	case AifCmdEventNotify:
		switch (le32_to_cpu(((u32 *)aifcmd->data)[0])) {
		/*
		 *	Add an Array.
		 */
		case AifEnAddContainer:
			container = le32_to_cpu(((u32 *)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;
			break;

		/*
		 *	Delete an Array.
		 */
		case AifEnDeleteContainer:
			container = le32_to_cpu(((u32 *)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;
			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(((u32 *)aifcmd->data)[1]);
			if (container >= dev->maximum_num_containers)
				break;
			if (dev->fsa_dev[container].config_waiting_on)
				break;
			dev->fsa_dev[container].config_needed = CHANGE;
			dev->fsa_dev[container].config_waiting_on =
				AifEnConfigChange;
			break;

		case AifEnConfigChange:
			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(*(u32 *)aifcmd->data))
				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(*(u32 *)aifcmd->data))
				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 ((((u32 *)aifcmd->data)[1] == cpu_to_le32(AifJobCtrZero))
		 && ((((u32 *)aifcmd->data)[6] == ((u32 *)aifcmd->data)[5])
		  || (((u32 *)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;
			}
		}
		if ((((u32 *)aifcmd->data)[1] == cpu_to_le32(AifJobCtrZero))
		 && (((u32 *)aifcmd->data)[6] == 0)
		 && (((u32 *)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;
			}
		}
		break;
	}

	device_config_needed = NOTHING;
	for (container = 0; container < dev->maximum_num_containers;
	    ++container) {
		if ((dev->fsa_dev[container].config_waiting_on == 0)
		 && (dev->fsa_dev[container].config_needed != NOTHING)) {
			device_config_needed =
				dev->fsa_dev[container].config_needed;
			dev->fsa_dev[container].config_needed = NOTHING;
			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.
	 */

	busy = 0;


	/*
	 *	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 probe_container
	 */
	if ((device_config_needed == CHANGE)
	 && (dev->fsa_dev[container].valid == 1))
		dev->fsa_dev[container].valid = 2;
	if ((device_config_needed == CHANGE) ||
			(device_config_needed == ADD))
		probe_container(dev, container);
	device = scsi_device_lookup(dev->scsi_host_ptr, 
		CONTAINER_TO_CHANNEL(container), 
		CONTAINER_TO_ID(container), 
		CONTAINER_TO_LUN(container));
	if (device) {
		switch (device_config_needed) {
		case DELETE:
			scsi_remove_device(device);
			break;
		case CHANGE:
			if (!dev->fsa_dev[container].valid) {
				scsi_remove_device(device);
				break;
			}
			scsi_rescan_device(&device->sdev_gendev);

		default:
			break;
		}
		scsi_device_put(device);
	}
	if (device_config_needed == ADD) {
		scsi_add_device(dev->scsi_host_ptr,
		  CONTAINER_TO_CHANNEL(container),
		  CONTAINER_TO_ID(container),
		  CONTAINER_TO_LUN(container));
	}

}

/**
 *	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_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(&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;
			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);
				*(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
				fib_adapter_complete(fib, (u16)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;
				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 if (hw_fib_pool) {
					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) > 120) {
							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 = 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);
				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]) {
					if (*hw_fib_p)
						kfree(*hw_fib_p);
					if (*fib_p)
						kfree(*fib_p);
					++fib_p;
					++hw_fib_p;
				}
				if (hw_fib_pool)
					kfree(hw_fib_pool);
				if (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);
		schedule();

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