err.no Git - linux-2.6/blob - drivers/scsi/aacraid/commsup.c

   1 /*
   2  *      Adaptec AAC series RAID controller driver
   3  *      (c) Copyright 2001 Red Hat Inc. <alan@redhat.com>
   4  *
   5  * based on the old aacraid driver that is..
   6  * Adaptec aacraid device driver for Linux.
   7  *
   8  * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; see the file COPYING.  If not, write to
  22  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * Module Name:
  25  *  commsup.c
  26  *
  27  * Abstract: Contain all routines that are required for FSA host/adapter
  28  *    communication.
  29  *
  30  */
  31
  32 #include <linux/kernel.h>
  33 #include <linux/init.h>
  34 #include <linux/types.h>
  35 #include <linux/sched.h>
  36 #include <linux/pci.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/slab.h>
  39 #include <linux/completion.h>
  40 #include <linux/blkdev.h>
  41 #include <linux/delay.h>
  42 #include <linux/kthread.h>
  43 #include <scsi/scsi_host.h>
  44 #include <scsi/scsi_device.h>
  45 #include <asm/semaphore.h>
  46
  47 #include "aacraid.h"
  48
  49 /**
  50  *      fib_map_alloc           -       allocate the fib objects
  51  *      @dev: Adapter to allocate for
  52  *
  53  *      Allocate and map the shared PCI space for the FIB blocks used to
  54  *      talk to the Adaptec firmware.
  55  */
  56
  57 static int fib_map_alloc(struct aac_dev *dev)
  58 {
  59         dprintk((KERN_INFO
  60           "allocate hardware fibs pci_alloc_consistent(%p, %d * (%d + %d), %p)\n",
  61           dev->pdev, dev->max_fib_size, dev->scsi_host_ptr->can_queue,
  62           AAC_NUM_MGT_FIB, &dev->hw_fib_pa));
  63         if((dev->hw_fib_va = pci_alloc_consistent(dev->pdev, dev->max_fib_size
  64           * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB),
  65           &dev->hw_fib_pa))==NULL)
  66                 return -ENOMEM;
  67         return 0;
  68 }
  69
  70 /**
  71  *      aac_fib_map_free                -       free the fib objects
  72  *      @dev: Adapter to free
  73  *
  74  *      Free the PCI mappings and the memory allocated for FIB blocks
  75  *      on this adapter.
  76  */
  77
  78 void aac_fib_map_free(struct aac_dev *dev)
  79 {
  80         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);
  81 }
  82
  83 /**
  84  *      aac_fib_setup   -       setup the fibs
  85  *      @dev: Adapter to set up
  86  *
  87  *      Allocate the PCI space for the fibs, map it and then intialise the
  88  *      fib area, the unmapped fib data and also the free list
  89  */
  90
  91 int aac_fib_setup(struct aac_dev * dev)
  92 {
  93         struct fib *fibptr;
  94         struct hw_fib *hw_fib_va;
  95         dma_addr_t hw_fib_pa;
  96         int i;
  97
  98         while (((i = fib_map_alloc(dev)) == -ENOMEM)
  99          && (dev->scsi_host_ptr->can_queue > (64 - AAC_NUM_MGT_FIB))) {
 100                 dev->init->MaxIoCommands = cpu_to_le32((dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB) >> 1);
 101                 dev->scsi_host_ptr->can_queue = le32_to_cpu(dev->init->MaxIoCommands) - AAC_NUM_MGT_FIB;
 102         }
 103         if (i<0)
 104                 return -ENOMEM;
 105
 106         hw_fib_va = dev->hw_fib_va;
 107         hw_fib_pa = dev->hw_fib_pa;
 108         memset(hw_fib_va, 0, dev->max_fib_size * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB));
 109         /*
 110          *      Initialise the fibs
 111          */
 112         for (i = 0, fibptr = &dev->fibs[i]; i < (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB); i++, fibptr++)
 113         {
 114                 fibptr->dev = dev;
 115                 fibptr->hw_fib = hw_fib_va;
 116                 fibptr->data = (void *) fibptr->hw_fib->data;
 117                 fibptr->next = fibptr+1;        /* Forward chain the fibs */
 118                 init_MUTEX_LOCKED(&fibptr->event_wait);
 119                 spin_lock_init(&fibptr->event_lock);
 120                 hw_fib_va->header.XferState = cpu_to_le32(0xffffffff);
 121                 hw_fib_va->header.SenderSize = cpu_to_le16(dev->max_fib_size);
 122                 fibptr->hw_fib_pa = hw_fib_pa;
 123                 hw_fib_va = (struct hw_fib *)((unsigned char *)hw_fib_va + dev->max_fib_size);
 124                 hw_fib_pa = hw_fib_pa + dev->max_fib_size;
 125         }
 126         /*
 127          *      Add the fib chain to the free list
 128          */
 129         dev->fibs[dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB - 1].next = NULL;
 130         /*
 131          *      Enable this to debug out of queue space
 132          */
 133         dev->free_fib = &dev->fibs[0];
 134         return 0;
 135 }
 136
 137 /**
 138  *      aac_fib_alloc   -       allocate a fib
 139  *      @dev: Adapter to allocate the fib for
 140  *
 141  *      Allocate a fib from the adapter fib pool. If the pool is empty we
 142  *      return NULL.
 143  */
 144
 145 struct fib *aac_fib_alloc(struct aac_dev *dev)
 146 {
 147         struct fib * fibptr;
 148         unsigned long flags;
 149         spin_lock_irqsave(&dev->fib_lock, flags);
 150         fibptr = dev->free_fib;
 151         if(!fibptr){
 152                 spin_unlock_irqrestore(&dev->fib_lock, flags);
 153                 return fibptr;
 154         }
 155         dev->free_fib = fibptr->next;
 156         spin_unlock_irqrestore(&dev->fib_lock, flags);
 157         /*
 158          *      Set the proper node type code and node byte size
 159          */
 160         fibptr->type = FSAFS_NTC_FIB_CONTEXT;
 161         fibptr->size = sizeof(struct fib);
 162         /*
 163          *      Null out fields that depend on being zero at the start of
 164          *      each I/O
 165          */
 166         fibptr->hw_fib->header.XferState = 0;
 167         fibptr->callback = NULL;
 168         fibptr->callback_data = NULL;
 169
 170         return fibptr;
 171 }
 172
 173 /**
 174  *      aac_fib_free    -       free a fib
 175  *      @fibptr: fib to free up
 176  *
 177  *      Frees up a fib and places it on the appropriate queue
 178  *      (either free or timed out)
 179  */
 180
 181 void aac_fib_free(struct fib *fibptr)
 182 {
 183         unsigned long flags;
 184
 185         spin_lock_irqsave(&fibptr->dev->fib_lock, flags);
 186         if (fibptr->flags & FIB_CONTEXT_FLAG_TIMED_OUT) {
 187                 aac_config.fib_timeouts++;
 188                 fibptr->next = fibptr->dev->timeout_fib;
 189                 fibptr->dev->timeout_fib = fibptr;
 190         } else {
 191                 if (fibptr->hw_fib->header.XferState != 0) {
 192                         printk(KERN_WARNING "aac_fib_free, XferState != 0, fibptr = 0x%p, XferState = 0x%x\n",
 193                                  (void*)fibptr,
 194                                  le32_to_cpu(fibptr->hw_fib->header.XferState));
 195                 }
 196                 fibptr->next = fibptr->dev->free_fib;
 197                 fibptr->dev->free_fib = fibptr;
 198         }
 199         spin_unlock_irqrestore(&fibptr->dev->fib_lock, flags);
 200 }
 201
 202 /**
 203  *      aac_fib_init    -       initialise a fib
 204  *      @fibptr: The fib to initialize
 205  *
 206  *      Set up the generic fib fields ready for use
 207  */
 208
 209 void aac_fib_init(struct fib *fibptr)
 210 {
 211         struct hw_fib *hw_fib = fibptr->hw_fib;
 212
 213         hw_fib->header.StructType = FIB_MAGIC;
 214         hw_fib->header.Size = cpu_to_le16(fibptr->dev->max_fib_size);
 215         hw_fib->header.XferState = cpu_to_le32(HostOwned | FibInitialized | FibEmpty | FastResponseCapable);
 216         hw_fib->header.SenderFibAddress = 0; /* Filled in later if needed */
 217         hw_fib->header.ReceiverFibAddress = cpu_to_le32(fibptr->hw_fib_pa);
 218         hw_fib->header.SenderSize = cpu_to_le16(fibptr->dev->max_fib_size);
 219 }
 220
 221 /**
 222  *      fib_deallocate          -       deallocate a fib
 223  *      @fibptr: fib to deallocate
 224  *
 225  *      Will deallocate and return to the free pool the FIB pointed to by the
 226  *      caller.
 227  */
 228
 229 static void fib_dealloc(struct fib * fibptr)
 230 {
 231         struct hw_fib *hw_fib = fibptr->hw_fib;
 232         if(hw_fib->header.StructType != FIB_MAGIC)
 233                 BUG();
 234         hw_fib->header.XferState = 0;
 235 }
 236
 237 /*
 238  *      Commuication primitives define and support the queuing method we use to
 239  *      support host to adapter commuication. All queue accesses happen through
 240  *      these routines and are the only routines which have a knowledge of the
 241  *       how these queues are implemented.
 242  */
 243
 244 /**
 245  *      aac_get_entry           -       get a queue entry
 246  *      @dev: Adapter
 247  *      @qid: Queue Number
 248  *      @entry: Entry return
 249  *      @index: Index return
 250  *      @nonotify: notification control
 251  *
 252  *      With a priority the routine returns a queue entry if the queue has free entries. If the queue
 253  *      is full(no free entries) than no entry is returned and the function returns 0 otherwise 1 is
 254  *      returned.
 255  */
 256
 257 static int aac_get_entry (struct aac_dev * dev, u32 qid, struct aac_entry **entry, u32 * index, unsigned long *nonotify)
 258 {
 259         struct aac_queue * q;
 260         unsigned long idx;
 261
 262         /*
 263          *      All of the queues wrap when they reach the end, so we check
 264          *      to see if they have reached the end and if they have we just
 265          *      set the index back to zero. This is a wrap. You could or off
 266          *      the high bits in all updates but this is a bit faster I think.
 267          */
 268
 269         q = &dev->queues->queue[qid];
 270
 271         idx = *index = le32_to_cpu(*(q->headers.producer));
 272         /* Interrupt Moderation, only interrupt for first two entries */
 273         if (idx != le32_to_cpu(*(q->headers.consumer))) {
 274                 if (--idx == 0) {
 275                         if (qid == AdapNormCmdQueue)
 276                                 idx = ADAP_NORM_CMD_ENTRIES;
 277                         else
 278                                 idx = ADAP_NORM_RESP_ENTRIES;
 279                 }
 280                 if (idx != le32_to_cpu(*(q->headers.consumer)))
 281                         *nonotify = 1;
 282         }
 283
 284         if (qid == AdapNormCmdQueue) {
 285                 if (*index >= ADAP_NORM_CMD_ENTRIES)
 286                         *index = 0; /* Wrap to front of the Producer Queue. */
 287         } else {
 288                 if (*index >= ADAP_NORM_RESP_ENTRIES)
 289                         *index = 0; /* Wrap to front of the Producer Queue. */
 290         }
 291
 292         if ((*index + 1) == le32_to_cpu(*(q->headers.consumer))) { /* Queue is full */
 293                 printk(KERN_WARNING "Queue %d full, %u outstanding.\n",
 294                                 qid, q->numpending);
 295                 return 0;
 296         } else {
 297                 *entry = q->base + *index;
 298                 return 1;
 299         }
 300 }
 301
 302 /**
 303  *      aac_queue_get           -       get the next free QE
 304  *      @dev: Adapter
 305  *      @index: Returned index
 306  *      @priority: Priority of fib
 307  *      @fib: Fib to associate with the queue entry
 308  *      @wait: Wait if queue full
 309  *      @fibptr: Driver fib object to go with fib
 310  *      @nonotify: Don't notify the adapter
 311  *
 312  *      Gets the next free QE off the requested priorty adapter command
 313  *      queue and associates the Fib with the QE. The QE represented by
 314  *      index is ready to insert on the queue when this routine returns
 315  *      success.
 316  */
 317
 318 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)
 319 {
 320         struct aac_entry * entry = NULL;
 321         int map = 0;
 322
 323         if (qid == AdapNormCmdQueue) {
 324                 /*  if no entries wait for some if caller wants to */
 325                 while (!aac_get_entry(dev, qid, &entry, index, nonotify))
 326                 {
 327                         printk(KERN_ERR "GetEntries failed\n");
 328                 }
 329                 /*
 330                  *      Setup queue entry with a command, status and fib mapped
 331                  */
 332                 entry->size = cpu_to_le32(le16_to_cpu(hw_fib->header.Size));
 333                 map = 1;
 334         } else {
 335                 while(!aac_get_entry(dev, qid, &entry, index, nonotify))
 336                 {
 337                         /* if no entries wait for some if caller wants to */
 338                 }
 339                 /*
 340                  *      Setup queue entry with command, status and fib mapped
 341                  */
 342                 entry->size = cpu_to_le32(le16_to_cpu(hw_fib->header.Size));
 343                 entry->addr = hw_fib->header.SenderFibAddress;
 344                         /* Restore adapters pointer to the FIB */
 345                 hw_fib->header.ReceiverFibAddress = hw_fib->header.SenderFibAddress;    /* Let the adapter now where to find its data */
 346                 map = 0;
 347         }
 348         /*
 349          *      If MapFib is true than we need to map the Fib and put pointers
 350          *      in the queue entry.
 351          */
 352         if (map)
 353                 entry->addr = cpu_to_le32(fibptr->hw_fib_pa);
 354         return 0;
 355 }
 356
 357 /*
 358  *      Define the highest level of host to adapter communication routines.
 359  *      These routines will support host to adapter FS commuication. These
 360  *      routines have no knowledge of the commuication method used. This level
 361  *      sends and receives FIBs. This level has no knowledge of how these FIBs
 362  *      get passed back and forth.
 363  */
 364
 365 /**
 366  *      aac_fib_send    -       send a fib to the adapter
 367  *      @command: Command to send
 368  *      @fibptr: The fib
 369  *      @size: Size of fib data area
 370  *      @priority: Priority of Fib
 371  *      @wait: Async/sync select
 372  *      @reply: True if a reply is wanted
 373  *      @callback: Called with reply
 374  *      @callback_data: Passed to callback
 375  *
 376  *      Sends the requested FIB to the adapter and optionally will wait for a
 377  *      response FIB. If the caller does not wish to wait for a response than
 378  *      an event to wait on must be supplied. This event will be set when a
 379  *      response FIB is received from the adapter.
 380  */
 381
 382 int aac_fib_send(u16 command, struct fib *fibptr, unsigned long size,
 383                 int priority, int wait, int reply, fib_callback callback,
 384                 void *callback_data)
 385 {
 386         struct aac_dev * dev = fibptr->dev;
 387         struct hw_fib * hw_fib = fibptr->hw_fib;
 388         struct aac_queue * q;
 389         unsigned long flags = 0;
 390         unsigned long qflags;
 391
 392         if (!(hw_fib->header.XferState & cpu_to_le32(HostOwned)))
 393                 return -EBUSY;
 394         /*
 395          *      There are 5 cases with the wait and reponse requested flags.
 396          *      The only invalid cases are if the caller requests to wait and
 397          *      does not request a response and if the caller does not want a
 398          *      response and the Fib is not allocated from pool. If a response
 399          *      is not requesed the Fib will just be deallocaed by the DPC
 400          *      routine when the response comes back from the adapter. No
 401          *      further processing will be done besides deleting the Fib. We
 402          *      will have a debug mode where the adapter can notify the host
 403          *      it had a problem and the host can log that fact.
 404          */
 405         if (wait && !reply) {
 406                 return -EINVAL;
 407         } else if (!wait && reply) {
 408                 hw_fib->header.XferState |= cpu_to_le32(Async | ResponseExpected);
 409                 FIB_COUNTER_INCREMENT(aac_config.AsyncSent);
 410         } else if (!wait && !reply) {
 411                 hw_fib->header.XferState |= cpu_to_le32(NoResponseExpected);
 412                 FIB_COUNTER_INCREMENT(aac_config.NoResponseSent);
 413         } else if (wait && reply) {
 414                 hw_fib->header.XferState |= cpu_to_le32(ResponseExpected);
 415                 FIB_COUNTER_INCREMENT(aac_config.NormalSent);
 416         }
 417         /*
 418          *      Map the fib into 32bits by using the fib number
 419          */
 420
 421         hw_fib->header.SenderFibAddress = cpu_to_le32(((u32)(fibptr - dev->fibs)) << 2);
 422         hw_fib->header.SenderData = (u32)(fibptr - dev->fibs);
 423         /*
 424          *      Set FIB state to indicate where it came from and if we want a
 425          *      response from the adapter. Also load the command from the
 426          *      caller.
 427          *
 428          *      Map the hw fib pointer as a 32bit value
 429          */
 430         hw_fib->header.Command = cpu_to_le16(command);
 431         hw_fib->header.XferState |= cpu_to_le32(SentFromHost);
 432         fibptr->hw_fib->header.Flags = 0;       /* 0 the flags field - internal only*/
 433         /*
 434          *      Set the size of the Fib we want to send to the adapter
 435          */
 436         hw_fib->header.Size = cpu_to_le16(sizeof(struct aac_fibhdr) + size);
 437         if (le16_to_cpu(hw_fib->header.Size) > le16_to_cpu(hw_fib->header.SenderSize)) {
 438                 return -EMSGSIZE;
 439         }
 440         /*
 441          *      Get a queue entry connect the FIB to it and send an notify
 442          *      the adapter a command is ready.
 443          */
 444         hw_fib->header.XferState |= cpu_to_le32(NormalPriority);
 445
 446         /*
 447          *      Fill in the Callback and CallbackContext if we are not
 448          *      going to wait.
 449          */
 450         if (!wait) {
 451                 fibptr->callback = callback;
 452                 fibptr->callback_data = callback_data;
 453         }
 454
 455         fibptr->done = 0;
 456         fibptr->flags = 0;
 457
 458         FIB_COUNTER_INCREMENT(aac_config.FibsSent);
 459
 460         dprintk((KERN_DEBUG "Fib contents:.\n"));
 461         dprintk((KERN_DEBUG "  Command =               %d.\n", le32_to_cpu(hw_fib->header.Command)));
 462         dprintk((KERN_DEBUG "  SubCommand =            %d.\n", le32_to_cpu(((struct aac_query_mount *)fib_data(fibptr))->command)));
 463         dprintk((KERN_DEBUG "  XferState  =            %x.\n", le32_to_cpu(hw_fib->header.XferState)));
 464         dprintk((KERN_DEBUG "  hw_fib va being sent=%p\n",fibptr->hw_fib));
 465         dprintk((KERN_DEBUG "  hw_fib pa being sent=%lx\n",(ulong)fibptr->hw_fib_pa));
 466         dprintk((KERN_DEBUG "  fib being sent=%p\n",fibptr));
 467
 468         q = &dev->queues->queue[AdapNormCmdQueue];
 469
 470         if(wait)
 471                 spin_lock_irqsave(&fibptr->event_lock, flags);
 472         spin_lock_irqsave(q->lock, qflags);
 473         if (dev->new_comm_interface) {
 474                 unsigned long count = 10000000L; /* 50 seconds */
 475                 q->numpending++;
 476                 spin_unlock_irqrestore(q->lock, qflags);
 477                 while (aac_adapter_send(fibptr) != 0) {
 478                         if (--count == 0) {
 479                                 if (wait)
 480                                         spin_unlock_irqrestore(&fibptr->event_lock, flags);
 481                                 spin_lock_irqsave(q->lock, qflags);
 482                                 q->numpending--;
 483                                 spin_unlock_irqrestore(q->lock, qflags);
 484                                 return -ETIMEDOUT;
 485                         }
 486                         udelay(5);
 487                 }
 488         } else {
 489                 u32 index;
 490                 unsigned long nointr = 0;
 491                 aac_queue_get( dev, &index, AdapNormCmdQueue, hw_fib, 1, fibptr, &nointr);
 492
 493                 q->numpending++;
 494                 *(q->headers.producer) = cpu_to_le32(index + 1);
 495                 spin_unlock_irqrestore(q->lock, qflags);
 496                 dprintk((KERN_DEBUG "aac_fib_send: inserting a queue entry at index %d.\n",index));
 497                 if (!(nointr & aac_config.irq_mod))
 498                         aac_adapter_notify(dev, AdapNormCmdQueue);
 499         }
 500
 501         /*
 502          *      If the caller wanted us to wait for response wait now.
 503          */
 504
 505         if (wait) {
 506                 spin_unlock_irqrestore(&fibptr->event_lock, flags);
 507                 /* Only set for first known interruptable command */
 508                 if (wait < 0) {
 509                         /*
 510                          * *VERY* Dangerous to time out a command, the
 511                          * assumption is made that we have no hope of
 512                          * functioning because an interrupt routing or other
 513                          * hardware failure has occurred.
 514                          */
 515                         unsigned long count = 36000000L; /* 3 minutes */
 516                         while (down_trylock(&fibptr->event_wait)) {
 517                                 if (--count == 0) {
 518                                         spin_lock_irqsave(q->lock, qflags);
 519                                         q->numpending--;
 520                                         spin_unlock_irqrestore(q->lock, qflags);
 521                                         if (wait == -1) {
 522                                                 printk(KERN_ERR "aacraid: aac_fib_send: first asynchronous command timed out.\n"
 523                                                   "Usually a result of a PCI interrupt routing problem;\n"
 524                                                   "update mother board BIOS or consider utilizing one of\n"
 525                                                   "the SAFE mode kernel options (acpi, apic etc)\n");
 526                                         }
 527                                         return -ETIMEDOUT;
 528                                 }
 529                                 udelay(5);
 530                         }
 531                 } else
 532                         down(&fibptr->event_wait);
 533                 if(fibptr->done == 0)
 534                         BUG();
 535
 536                 if((fibptr->flags & FIB_CONTEXT_FLAG_TIMED_OUT)){
 537                         return -ETIMEDOUT;
 538                 } else {
 539                         return 0;
 540                 }
 541         }
 542         /*
 543          *      If the user does not want a response than return success otherwise
 544          *      return pending
 545          */
 546         if (reply)
 547                 return -EINPROGRESS;
 548         else
 549                 return 0;
 550 }
 551
 552 /**
 553  *      aac_consumer_get        -       get the top of the queue
 554  *      @dev: Adapter
 555  *      @q: Queue
 556  *      @entry: Return entry
 557  *
 558  *      Will return a pointer to the entry on the top of the queue requested that
 559  *      we are a consumer of, and return the address of the queue entry. It does
 560  *      not change the state of the queue.
 561  */
 562
 563 int aac_consumer_get(struct aac_dev * dev, struct aac_queue * q, struct aac_entry **entry)
 564 {
 565         u32 index;
 566         int status;
 567         if (le32_to_cpu(*q->headers.producer) == le32_to_cpu(*q->headers.consumer)) {
 568                 status = 0;
 569         } else {
 570                 /*
 571                  *      The consumer index must be wrapped if we have reached
 572                  *      the end of the queue, else we just use the entry
 573                  *      pointed to by the header index
 574                  */
 575                 if (le32_to_cpu(*q->headers.consumer) >= q->entries)
 576                         index = 0;
 577                 else
 578                         index = le32_to_cpu(*q->headers.consumer);
 579                 *entry = q->base + index;
 580                 status = 1;
 581         }
 582         return(status);
 583 }
 584
 585 /**
 586  *      aac_consumer_free       -       free consumer entry
 587  *      @dev: Adapter
 588  *      @q: Queue
 589  *      @qid: Queue ident
 590  *
 591  *      Frees up the current top of the queue we are a consumer of. If the
 592  *      queue was full notify the producer that the queue is no longer full.
 593  */
 594
 595 void aac_consumer_free(struct aac_dev * dev, struct aac_queue *q, u32 qid)
 596 {
 597         int wasfull = 0;
 598         u32 notify;
 599
 600         if ((le32_to_cpu(*q->headers.producer)+1) == le32_to_cpu(*q->headers.consumer))
 601                 wasfull = 1;
 602
 603         if (le32_to_cpu(*q->headers.consumer) >= q->entries)
 604                 *q->headers.consumer = cpu_to_le32(1);
 605         else
 606                 *q->headers.consumer = cpu_to_le32(le32_to_cpu(*q->headers.consumer)+1);
 607
 608         if (wasfull) {
 609                 switch (qid) {
 610
 611                 case HostNormCmdQueue:
 612                         notify = HostNormCmdNotFull;
 613                         break;
 614                 case HostNormRespQueue:
 615                         notify = HostNormRespNotFull;
 616                         break;
 617                 default:
 618                         BUG();
 619                         return;
 620                 }
 621                 aac_adapter_notify(dev, notify);
 622         }
 623 }
 624
 625 /**
 626  *      aac_fib_adapter_complete        -       complete adapter issued fib
 627  *      @fibptr: fib to complete
 628  *      @size: size of fib
 629  *
 630  *      Will do all necessary work to complete a FIB that was sent from
 631  *      the adapter.
 632  */
 633
 634 int aac_fib_adapter_complete(struct fib *fibptr, unsigned short size)
 635 {
 636         struct hw_fib * hw_fib = fibptr->hw_fib;
 637         struct aac_dev * dev = fibptr->dev;
 638         struct aac_queue * q;
 639         unsigned long nointr = 0;
 640         unsigned long qflags;
 641
 642         if (hw_fib->header.XferState == 0) {
 643                 if (dev->new_comm_interface)
 644                         kfree (hw_fib);
 645                 return 0;
 646         }
 647         /*
 648          *      If we plan to do anything check the structure type first.
 649          */
 650         if ( hw_fib->header.StructType != FIB_MAGIC ) {
 651                 if (dev->new_comm_interface)
 652                         kfree (hw_fib);
 653                 return -EINVAL;
 654         }
 655         /*
 656          *      This block handles the case where the adapter had sent us a
 657          *      command and we have finished processing the command. We
 658          *      call completeFib when we are done processing the command
 659          *      and want to send a response back to the adapter. This will
 660          *      send the completed cdb to the adapter.
 661          */
 662         if (hw_fib->header.XferState & cpu_to_le32(SentFromAdapter)) {
 663                 if (dev->new_comm_interface) {
 664                         kfree (hw_fib);
 665                 } else {
 666                         u32 index;
 667                         hw_fib->header.XferState |= cpu_to_le32(HostProcessed);
 668                         if (size) {
 669                                 size += sizeof(struct aac_fibhdr);
 670                                 if (size > le16_to_cpu(hw_fib->header.SenderSize))
 671                                         return -EMSGSIZE;
 672                                 hw_fib->header.Size = cpu_to_le16(size);
 673                         }
 674                         q = &dev->queues->queue[AdapNormRespQueue];
 675                         spin_lock_irqsave(q->lock, qflags);
 676                         aac_queue_get(dev, &index, AdapNormRespQueue, hw_fib, 1, NULL, &nointr);
 677                         *(q->headers.producer) = cpu_to_le32(index + 1);
 678                         spin_unlock_irqrestore(q->lock, qflags);
 679                         if (!(nointr & (int)aac_config.irq_mod))
 680                                 aac_adapter_notify(dev, AdapNormRespQueue);
 681                 }
 682         }
 683         else
 684         {
 685                 printk(KERN_WARNING "aac_fib_adapter_complete: Unknown xferstate detected.\n");
 686                 BUG();
 687         }
 688         return 0;
 689 }
 690
 691 /**
 692  *      aac_fib_complete        -       fib completion handler
 693  *      @fib: FIB to complete
 694  *
 695  *      Will do all necessary work to complete a FIB.
 696  */
 697
 698 int aac_fib_complete(struct fib *fibptr)
 699 {
 700         struct hw_fib * hw_fib = fibptr->hw_fib;
 701
 702         /*
 703          *      Check for a fib which has already been completed
 704          */
 705
 706         if (hw_fib->header.XferState == 0)
 707                 return 0;
 708         /*
 709          *      If we plan to do anything check the structure type first.
 710          */
 711
 712         if (hw_fib->header.StructType != FIB_MAGIC)
 713                 return -EINVAL;
 714         /*
 715          *      This block completes a cdb which orginated on the host and we
 716          *      just need to deallocate the cdb or reinit it. At this point the
 717          *      command is complete that we had sent to the adapter and this
 718          *      cdb could be reused.
 719          */
 720         if((hw_fib->header.XferState & cpu_to_le32(SentFromHost)) &&
 721                 (hw_fib->header.XferState & cpu_to_le32(AdapterProcessed)))
 722         {
 723                 fib_dealloc(fibptr);
 724         }
 725         else if(hw_fib->header.XferState & cpu_to_le32(SentFromHost))
 726         {
 727                 /*
 728                  *      This handles the case when the host has aborted the I/O
 729                  *      to the adapter because the adapter is not responding
 730                  */
 731                 fib_dealloc(fibptr);
 732         } else if(hw_fib->header.XferState & cpu_to_le32(HostOwned)) {
 733                 fib_dealloc(fibptr);
 734         } else {
 735                 BUG();
 736         }
 737         return 0;
 738 }
 739
 740 /**
 741  *      aac_printf      -       handle printf from firmware
 742  *      @dev: Adapter
 743  *      @val: Message info
 744  *
 745  *      Print a message passed to us by the controller firmware on the
 746  *      Adaptec board
 747  */
 748
 749 void aac_printf(struct aac_dev *dev, u32 val)
 750 {
 751         char *cp = dev->printfbuf;
 752         if (dev->printf_enabled)
 753         {
 754                 int length = val & 0xffff;
 755                 int level = (val >> 16) & 0xffff;
 756
 757                 /*
 758                  *      The size of the printfbuf is set in port.c
 759                  *      There is no variable or define for it
 760                  */
 761                 if (length > 255)
 762                         length = 255;
 763                 if (cp[length] != 0)
 764                         cp[length] = 0;
 765                 if (level == LOG_AAC_HIGH_ERROR)
 766                         printk(KERN_WARNING "%s:%s", dev->name, cp);
 767                 else
 768                         printk(KERN_INFO "%s:%s", dev->name, cp);
 769         }
 770         memset(cp, 0,  256);
 771 }
 772
 773
 774 /**
 775  *      aac_handle_aif          -       Handle a message from the firmware
 776  *      @dev: Which adapter this fib is from
 777  *      @fibptr: Pointer to fibptr from adapter
 778  *
 779  *      This routine handles a driver notify fib from the adapter and
 780  *      dispatches it to the appropriate routine for handling.
 781  */
 782
 783 #define AIF_SNIFF_TIMEOUT       (30*HZ)
 784 static void aac_handle_aif(struct aac_dev * dev, struct fib * fibptr)
 785 {
 786         struct hw_fib * hw_fib = fibptr->hw_fib;
 787         struct aac_aifcmd * aifcmd = (struct aac_aifcmd *)hw_fib->data;
 788         int busy;
 789         u32 container;
 790         struct scsi_device *device;
 791         enum {
 792                 NOTHING,
 793                 DELETE,
 794                 ADD,
 795                 CHANGE
 796         } device_config_needed;
 797
 798         /* Sniff for container changes */
 799
 800         if (!dev)
 801                 return;
 802         container = (u32)-1;
 803
 804         /*
 805          *      We have set this up to try and minimize the number of
 806          * re-configures that take place. As a result of this when
 807          * certain AIF's come in we will set a flag waiting for another
 808          * type of AIF before setting the re-config flag.
 809          */
 810         switch (le32_to_cpu(aifcmd->command)) {
 811         case AifCmdDriverNotify:
 812                 switch (le32_to_cpu(((u32 *)aifcmd->data)[0])) {
 813                 /*
 814                  *      Morph or Expand complete
 815                  */
 816                 case AifDenMorphComplete:
 817                 case AifDenVolumeExtendComplete:
 818                         container = le32_to_cpu(((u32 *)aifcmd->data)[1]);
 819                         if (container >= dev->maximum_num_containers)
 820                                 break;
 821
 822                         /*
 823                          *      Find the scsi_device associated with the SCSI
 824                          * address. Make sure we have the right array, and if
 825                          * so set the flag to initiate a new re-config once we
 826                          * see an AifEnConfigChange AIF come through.
 827                          */
 828
 829                         if ((dev != NULL) && (dev->scsi_host_ptr != NULL)) {
 830                                 device = scsi_device_lookup(dev->scsi_host_ptr,
 831                                         CONTAINER_TO_CHANNEL(container),
 832                                         CONTAINER_TO_ID(container),
 833                                         CONTAINER_TO_LUN(container));
 834                                 if (device) {
 835                                         dev->fsa_dev[container].config_needed = CHANGE;
 836                                         dev->fsa_dev[container].config_waiting_on = AifEnConfigChange;
 837                                         dev->fsa_dev[container].config_waiting_stamp = jiffies;
 838                                         scsi_device_put(device);
 839                                 }
 840                         }
 841                 }
 842
 843                 /*
 844                  *      If we are waiting on something and this happens to be
 845                  * that thing then set the re-configure flag.
 846                  */
 847                 if (container != (u32)-1) {
 848                         if (container >= dev->maximum_num_containers)
 849                                 break;
 850                         if ((dev->fsa_dev[container].config_waiting_on ==
 851                             le32_to_cpu(*(u32 *)aifcmd->data)) &&
 852                          time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
 853                                 dev->fsa_dev[container].config_waiting_on = 0;
 854                 } else for (container = 0;
 855                     container < dev->maximum_num_containers; ++container) {
 856                         if ((dev->fsa_dev[container].config_waiting_on ==
 857                             le32_to_cpu(*(u32 *)aifcmd->data)) &&
 858                          time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
 859                                 dev->fsa_dev[container].config_waiting_on = 0;
 860                 }
 861                 break;
 862
 863         case AifCmdEventNotify:
 864                 switch (le32_to_cpu(((u32 *)aifcmd->data)[0])) {
 865                 /*
 866                  *      Add an Array.
 867                  */
 868                 case AifEnAddContainer:
 869                         container = le32_to_cpu(((u32 *)aifcmd->data)[1]);
 870                         if (container >= dev->maximum_num_containers)
 871                                 break;
 872                         dev->fsa_dev[container].config_needed = ADD;
 873                         dev->fsa_dev[container].config_waiting_on =
 874                                 AifEnConfigChange;
 875                         dev->fsa_dev[container].config_waiting_stamp = jiffies;
 876                         break;
 877
 878                 /*
 879                  *      Delete an Array.
 880                  */
 881                 case AifEnDeleteContainer:
 882                         container = le32_to_cpu(((u32 *)aifcmd->data)[1]);
 883                         if (container >= dev->maximum_num_containers)
 884                                 break;
 885                         dev->fsa_dev[container].config_needed = DELETE;
 886                         dev->fsa_dev[container].config_waiting_on =
 887                                 AifEnConfigChange;
 888                         dev->fsa_dev[container].config_waiting_stamp = jiffies;
 889                         break;
 890
 891                 /*
 892                  *      Container change detected. If we currently are not
 893                  * waiting on something else, setup to wait on a Config Change.
 894                  */
 895                 case AifEnContainerChange:
 896                         container = le32_to_cpu(((u32 *)aifcmd->data)[1]);
 897                         if (container >= dev->maximum_num_containers)
 898                                 break;
 899                         if (dev->fsa_dev[container].config_waiting_on &&
 900                          time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
 901                                 break;
 902                         dev->fsa_dev[container].config_needed = CHANGE;
 903                         dev->fsa_dev[container].config_waiting_on =
 904                                 AifEnConfigChange;
 905                         dev->fsa_dev[container].config_waiting_stamp = jiffies;
 906                         break;
 907
 908                 case AifEnConfigChange:
 909                         break;
 910
 911                 }
 912
 913                 /*
 914                  *      If we are waiting on something and this happens to be
 915                  * that thing then set the re-configure flag.
 916                  */
 917                 if (container != (u32)-1) {
 918                         if (container >= dev->maximum_num_containers)
 919                                 break;
 920                         if ((dev->fsa_dev[container].config_waiting_on ==
 921                             le32_to_cpu(*(u32 *)aifcmd->data)) &&
 922                          time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
 923                                 dev->fsa_dev[container].config_waiting_on = 0;
 924                 } else for (container = 0;
 925                     container < dev->maximum_num_containers; ++container) {
 926                         if ((dev->fsa_dev[container].config_waiting_on ==
 927                             le32_to_cpu(*(u32 *)aifcmd->data)) &&
 928                          time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
 929                                 dev->fsa_dev[container].config_waiting_on = 0;
 930                 }
 931                 break;
 932
 933         case AifCmdJobProgress:
 934                 /*
 935                  *      These are job progress AIF's. When a Clear is being
 936                  * done on a container it is initially created then hidden from
 937                  * the OS. When the clear completes we don't get a config
 938                  * change so we monitor the job status complete on a clear then
 939                  * wait for a container change.
 940                  */
 941
 942                 if ((((u32 *)aifcmd->data)[1] == cpu_to_le32(AifJobCtrZero))
 943                  && ((((u32 *)aifcmd->data)[6] == ((u32 *)aifcmd->data)[5])
 944                   || (((u32 *)aifcmd->data)[4] == cpu_to_le32(AifJobStsSuccess)))) {
 945                         for (container = 0;
 946                             container < dev->maximum_num_containers;
 947                             ++container) {
 948                                 /*
 949                                  * Stomp on all config sequencing for all
 950                                  * containers?
 951                                  */
 952                                 dev->fsa_dev[container].config_waiting_on =
 953                                         AifEnContainerChange;
 954                                 dev->fsa_dev[container].config_needed = ADD;
 955                                 dev->fsa_dev[container].config_waiting_stamp =
 956                                         jiffies;
 957                         }
 958                 }
 959                 if ((((u32 *)aifcmd->data)[1] == cpu_to_le32(AifJobCtrZero))
 960                  && (((u32 *)aifcmd->data)[6] == 0)
 961                  && (((u32 *)aifcmd->data)[4] == cpu_to_le32(AifJobStsRunning))) {
 962                         for (container = 0;
 963                             container < dev->maximum_num_containers;
 964                             ++container) {
 965                                 /*
 966                                  * Stomp on all config sequencing for all
 967                                  * containers?
 968                                  */
 969                                 dev->fsa_dev[container].config_waiting_on =
 970                                         AifEnContainerChange;
 971                                 dev->fsa_dev[container].config_needed = DELETE;
 972                                 dev->fsa_dev[container].config_waiting_stamp =
 973                                         jiffies;
 974                         }
 975                 }
 976                 break;
 977         }
 978
 979         device_config_needed = NOTHING;
 980         for (container = 0; container < dev->maximum_num_containers;
 981             ++container) {
 982                 if ((dev->fsa_dev[container].config_waiting_on == 0) &&
 983                         (dev->fsa_dev[container].config_needed != NOTHING) &&
 984                         time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT)) {
 985                         device_config_needed =
 986                                 dev->fsa_dev[container].config_needed;
 987                         dev->fsa_dev[container].config_needed = NOTHING;
 988                         break;
 989                 }
 990         }
 991         if (device_config_needed == NOTHING)
 992                 return;
 993
 994         /*
 995          *      If we decided that a re-configuration needs to be done,
 996          * schedule it here on the way out the door, please close the door
 997          * behind you.
 998          */
 999
1000         busy = 0;
1001
1002
1003         /*
1004          *      Find the scsi_device associated with the SCSI address,
1005          * and mark it as changed, invalidating the cache. This deals
1006          * with changes to existing device IDs.
1007          */
1008
1009         if (!dev || !dev->scsi_host_ptr)
1010                 return;
1011         /*
1012          * force reload of disk info via aac_probe_container
1013          */
1014         if ((device_config_needed == CHANGE)
1015          && (dev->fsa_dev[container].valid == 1))
1016                 dev->fsa_dev[container].valid = 2;
1017         if ((device_config_needed == CHANGE) ||
1018                         (device_config_needed == ADD))
1019                 aac_probe_container(dev, container);
1020         device = scsi_device_lookup(dev->scsi_host_ptr,
1021                 CONTAINER_TO_CHANNEL(container),
1022                 CONTAINER_TO_ID(container),
1023                 CONTAINER_TO_LUN(container));
1024         if (device) {
1025                 switch (device_config_needed) {
1026                 case DELETE:
1027                         scsi_remove_device(device);
1028                         break;
1029                 case CHANGE:
1030                         if (!dev->fsa_dev[container].valid) {
1031                                 scsi_remove_device(device);
1032                                 break;
1033                         }
1034                         scsi_rescan_device(&device->sdev_gendev);
1035
1036                 default:
1037                         break;
1038                 }
1039                 scsi_device_put(device);
1040         }
1041         if (device_config_needed == ADD) {
1042                 scsi_add_device(dev->scsi_host_ptr,
1043                   CONTAINER_TO_CHANNEL(container),
1044                   CONTAINER_TO_ID(container),
1045                   CONTAINER_TO_LUN(container));
1046         }
1047
1048 }
1049
1050 /**
1051  *      aac_command_thread      -       command processing thread
1052  *      @dev: Adapter to monitor
1053  *
1054  *      Waits on the commandready event in it's queue. When the event gets set
1055  *      it will pull FIBs off it's queue. It will continue to pull FIBs off
1056  *      until the queue is empty. When the queue is empty it will wait for
1057  *      more FIBs.
1058  */
1059
1060 int aac_command_thread(void *data)
1061 {
1062         struct aac_dev *dev = data;
1063         struct hw_fib *hw_fib, *hw_newfib;
1064         struct fib *fib, *newfib;
1065         struct aac_fib_context *fibctx;
1066         unsigned long flags;
1067         DECLARE_WAITQUEUE(wait, current);
1068
1069         /*
1070          *      We can only have one thread per adapter for AIF's.
1071          */
1072         if (dev->aif_thread)
1073                 return -EINVAL;
1074
1075         /*
1076          *      Let the DPC know it has a place to send the AIF's to.
1077          */
1078         dev->aif_thread = 1;
1079         add_wait_queue(&dev->queues->queue[HostNormCmdQueue].cmdready, &wait);
1080         set_current_state(TASK_INTERRUPTIBLE);
1081         dprintk ((KERN_INFO "aac_command_thread start\n"));
1082         while(1)
1083         {
1084                 spin_lock_irqsave(dev->queues->queue[HostNormCmdQueue].lock, flags);
1085                 while(!list_empty(&(dev->queues->queue[HostNormCmdQueue].cmdq))) {
1086                         struct list_head *entry;
1087                         struct aac_aifcmd * aifcmd;
1088
1089                         set_current_state(TASK_RUNNING);
1090
1091                         entry = dev->queues->queue[HostNormCmdQueue].cmdq.next;
1092                         list_del(entry);
1093
1094                         spin_unlock_irqrestore(dev->queues->queue[HostNormCmdQueue].lock, flags);
1095                         fib = list_entry(entry, struct fib, fiblink);
1096                         /*
1097                          *      We will process the FIB here or pass it to a
1098                          *      worker thread that is TBD. We Really can't
1099                          *      do anything at this point since we don't have
1100                          *      anything defined for this thread to do.
1101                          */
1102                         hw_fib = fib->hw_fib;
1103                         memset(fib, 0, sizeof(struct fib));
1104                         fib->type = FSAFS_NTC_FIB_CONTEXT;
1105                         fib->size = sizeof( struct fib );
1106                         fib->hw_fib = hw_fib;
1107                         fib->data = hw_fib->data;
1108                         fib->dev = dev;
1109                         /*
1110                          *      We only handle AifRequest fibs from the adapter.
1111                          */
1112                         aifcmd = (struct aac_aifcmd *) hw_fib->data;
1113                         if (aifcmd->command == cpu_to_le32(AifCmdDriverNotify)) {
1114                                 /* Handle Driver Notify Events */
1115                                 aac_handle_aif(dev, fib);
1116                                 *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
1117                                 aac_fib_adapter_complete(fib, (u16)sizeof(u32));
1118                         } else {
1119                                 struct list_head *entry;
1120                                 /* The u32 here is important and intended. We are using
1121                                    32bit wrapping time to fit the adapter field */
1122
1123                                 u32 time_now, time_last;
1124                                 unsigned long flagv;
1125                                 unsigned num;
1126                                 struct hw_fib ** hw_fib_pool, ** hw_fib_p;
1127                                 struct fib ** fib_pool, ** fib_p;
1128
1129                                 /* Sniff events */
1130                                 if ((aifcmd->command ==
1131                                      cpu_to_le32(AifCmdEventNotify)) ||
1132                                     (aifcmd->command ==
1133                                      cpu_to_le32(AifCmdJobProgress))) {
1134                                         aac_handle_aif(dev, fib);
1135                                 }
1136
1137                                 time_now = jiffies/HZ;
1138
1139                                 /*
1140                                  * Warning: no sleep allowed while
1141                                  * holding spinlock. We take the estimate
1142                                  * and pre-allocate a set of fibs outside the
1143                                  * lock.
1144                                  */
1145                                 num = le32_to_cpu(dev->init->AdapterFibsSize)
1146                                     / sizeof(struct hw_fib); /* some extra */
1147                                 spin_lock_irqsave(&dev->fib_lock, flagv);
1148                                 entry = dev->fib_list.next;
1149                                 while (entry != &dev->fib_list) {
1150                                         entry = entry->next;
1151                                         ++num;
1152                                 }
1153                                 spin_unlock_irqrestore(&dev->fib_lock, flagv);
1154                                 hw_fib_pool = NULL;
1155                                 fib_pool = NULL;
1156                                 if (num
1157                                  && ((hw_fib_pool = kmalloc(sizeof(struct hw_fib *) * num, GFP_KERNEL)))
1158                                  && ((fib_pool = kmalloc(sizeof(struct fib *) * num, GFP_KERNEL)))) {
1159                                         hw_fib_p = hw_fib_pool;
1160                                         fib_p = fib_pool;
1161                                         while (hw_fib_p < &hw_fib_pool[num]) {
1162                                                 if (!(*(hw_fib_p++) = kmalloc(sizeof(struct hw_fib), GFP_KERNEL))) {
1163                                                         --hw_fib_p;
1164                                                         break;
1165                                                 }
1166                                                 if (!(*(fib_p++) = kmalloc(sizeof(struct fib), GFP_KERNEL))) {
1167                                                         kfree(*(--hw_fib_p));
1168                                                         break;
1169                                                 }
1170                                         }
1171                                         if ((num = hw_fib_p - hw_fib_pool) == 0) {
1172                                                 kfree(fib_pool);
1173                                                 fib_pool = NULL;
1174                                                 kfree(hw_fib_pool);
1175                                                 hw_fib_pool = NULL;
1176                                         }
1177                                 } else {
1178                                         kfree(hw_fib_pool);
1179                                         hw_fib_pool = NULL;
1180                                 }
1181                                 spin_lock_irqsave(&dev->fib_lock, flagv);
1182                                 entry = dev->fib_list.next;
1183                                 /*
1184                                  * For each Context that is on the
1185                                  * fibctxList, make a copy of the
1186                                  * fib, and then set the event to wake up the
1187                                  * thread that is waiting for it.
1188                                  */
1189                                 hw_fib_p = hw_fib_pool;
1190                                 fib_p = fib_pool;
1191                                 while (entry != &dev->fib_list) {
1192                                         /*
1193                                          * Extract the fibctx
1194                                          */
1195                                         fibctx = list_entry(entry, struct aac_fib_context, next);
1196                                         /*
1197                                          * Check if the queue is getting
1198                                          * backlogged
1199                                          */
1200                                         if (fibctx->count > 20)
1201                                         {
1202                                                 /*
1203                                                  * It's *not* jiffies folks,
1204                                                  * but jiffies / HZ so do not
1205                                                  * panic ...
1206                                                  */
1207                                                 time_last = fibctx->jiffies;
1208                                                 /*
1209                                                  * Has it been > 2 minutes
1210                                                  * since the last read off
1211                                                  * the queue?
1212                                                  */
1213                                                 if ((time_now - time_last) > aif_timeout) {
1214                                                         entry = entry->next;
1215                                                         aac_close_fib_context(dev, fibctx);
1216                                                         continue;
1217                                                 }
1218                                         }
1219                                         /*
1220                                          * Warning: no sleep allowed while
1221                                          * holding spinlock
1222                                          */
1223                                         if (hw_fib_p < &hw_fib_pool[num]) {
1224                                                 hw_newfib = *hw_fib_p;
1225                                                 *(hw_fib_p++) = NULL;
1226                                                 newfib = *fib_p;
1227                                                 *(fib_p++) = NULL;
1228                                                 /*
1229                                                  * Make the copy of the FIB
1230                                                  */
1231                                                 memcpy(hw_newfib, hw_fib, sizeof(struct hw_fib));
1232                                                 memcpy(newfib, fib, sizeof(struct fib));
1233                                                 newfib->hw_fib = hw_newfib;
1234                                                 /*
1235                                                  * Put the FIB onto the
1236                                                  * fibctx's fibs
1237                                                  */
1238                                                 list_add_tail(&newfib->fiblink, &fibctx->fib_list);
1239                                                 fibctx->count++;
1240                                                 /*
1241                                                  * Set the event to wake up the
1242                                                  * thread that is waiting.
1243                                                  */
1244                                                 up(&fibctx->wait_sem);
1245                                         } else {
1246                                                 printk(KERN_WARNING "aifd: didn't allocate NewFib.\n");
1247                                         }
1248                                         entry = entry->next;
1249                                 }
1250                                 /*
1251                                  *      Set the status of this FIB
1252                                  */
1253                                 *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
1254                                 aac_fib_adapter_complete(fib, sizeof(u32));
1255                                 spin_unlock_irqrestore(&dev->fib_lock, flagv);
1256                                 /* Free up the remaining resources */
1257                                 hw_fib_p = hw_fib_pool;
1258                                 fib_p = fib_pool;
1259                                 while (hw_fib_p < &hw_fib_pool[num]) {
1260                                         kfree(*hw_fib_p);
1261                                         kfree(*fib_p);
1262                                         ++fib_p;
1263                                         ++hw_fib_p;
1264                                 }
1265                                 kfree(hw_fib_pool);
1266                                 kfree(fib_pool);
1267                         }
1268                         kfree(fib);
1269                         spin_lock_irqsave(dev->queues->queue[HostNormCmdQueue].lock, flags);
1270                 }
1271                 /*
1272                  *      There are no more AIF's
1273                  */
1274                 spin_unlock_irqrestore(dev->queues->queue[HostNormCmdQueue].lock, flags);
1275                 schedule();
1276
1277                 if (kthread_should_stop())
1278                         break;
1279                 set_current_state(TASK_INTERRUPTIBLE);
1280         }
1281         if (dev->queues)
1282                 remove_wait_queue(&dev->queues->queue[HostNormCmdQueue].cmdready, &wait);
1283         dev->aif_thread = 0;
1284         return 0;
1285 }