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