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                 list_add_tail(&fibptr->queue, &q->pendingq);
 476                 q->numpending++;
 477                 spin_unlock_irqrestore(q->lock, qflags);
 478                 while (aac_adapter_send(fibptr) != 0) {
 479                         if (--count == 0) {
 480                                 if (wait)
 481                                         spin_unlock_irqrestore(&fibptr->event_lock, flags);
 482                                 spin_lock_irqsave(q->lock, qflags);
 483                                 q->numpending--;
 484                                 list_del(&fibptr->queue);
 485                                 spin_unlock_irqrestore(q->lock, qflags);
 486                                 return -ETIMEDOUT;
 487                         }
 488                         udelay(5);
 489                 }
 490         } else {
 491                 u32 index;
 492                 unsigned long nointr = 0;
 493                 aac_queue_get( dev, &index, AdapNormCmdQueue, hw_fib, 1, fibptr, &nointr);
 494
 495                 list_add_tail(&fibptr->queue, &q->pendingq);
 496                 q->numpending++;
 497                 *(q->headers.producer) = cpu_to_le32(index + 1);
 498                 spin_unlock_irqrestore(q->lock, qflags);
 499                 dprintk((KERN_DEBUG "aac_fib_send: inserting a queue entry at index %d.\n",index));
 500                 if (!(nointr & aac_config.irq_mod))
 501                         aac_adapter_notify(dev, AdapNormCmdQueue);
 502         }
 503
 504         /*
 505          *      If the caller wanted us to wait for response wait now.
 506          */
 507
 508         if (wait) {
 509                 spin_unlock_irqrestore(&fibptr->event_lock, flags);
 510                 /* Only set for first known interruptable command */
 511                 if (wait < 0) {
 512                         /*
 513                          * *VERY* Dangerous to time out a command, the
 514                          * assumption is made that we have no hope of
 515                          * functioning because an interrupt routing or other
 516                          * hardware failure has occurred.
 517                          */
 518                         unsigned long count = 36000000L; /* 3 minutes */
 519                         while (down_trylock(&fibptr->event_wait)) {
 520                                 if (--count == 0) {
 521                                         spin_lock_irqsave(q->lock, qflags);
 522                                         q->numpending--;
 523                                         list_del(&fibptr->queue);
 524                                         spin_unlock_irqrestore(q->lock, qflags);
 525                                         if (wait == -1) {
 526                                                 printk(KERN_ERR "aacraid: aac_fib_send: first asynchronous command timed out.\n"
 527                                                   "Usually a result of a PCI interrupt routing problem;\n"
 528                                                   "update mother board BIOS or consider utilizing one of\n"
 529                                                   "the SAFE mode kernel options (acpi, apic etc)\n");
 530                                         }
 531                                         return -ETIMEDOUT;
 532                                 }
 533                                 udelay(5);
 534                         }
 535                 } else
 536                         down(&fibptr->event_wait);
 537                 if(fibptr->done == 0)
 538                         BUG();
 539
 540                 if((fibptr->flags & FIB_CONTEXT_FLAG_TIMED_OUT)){
 541                         return -ETIMEDOUT;
 542                 } else {
 543                         return 0;
 544                 }
 545         }
 546         /*
 547          *      If the user does not want a response than return success otherwise
 548          *      return pending
 549          */
 550         if (reply)
 551                 return -EINPROGRESS;
 552         else
 553                 return 0;
 554 }
 555
 556 /**
 557  *      aac_consumer_get        -       get the top of the queue
 558  *      @dev: Adapter
 559  *      @q: Queue
 560  *      @entry: Return entry
 561  *
 562  *      Will return a pointer to the entry on the top of the queue requested that
 563  *      we are a consumer of, and return the address of the queue entry. It does
 564  *      not change the state of the queue.
 565  */
 566
 567 int aac_consumer_get(struct aac_dev * dev, struct aac_queue * q, struct aac_entry **entry)
 568 {
 569         u32 index;
 570         int status;
 571         if (le32_to_cpu(*q->headers.producer) == le32_to_cpu(*q->headers.consumer)) {
 572                 status = 0;
 573         } else {
 574                 /*
 575                  *      The consumer index must be wrapped if we have reached
 576                  *      the end of the queue, else we just use the entry
 577                  *      pointed to by the header index
 578                  */
 579                 if (le32_to_cpu(*q->headers.consumer) >= q->entries)
 580                         index = 0;
 581                 else
 582                         index = le32_to_cpu(*q->headers.consumer);
 583                 *entry = q->base + index;
 584                 status = 1;
 585         }
 586         return(status);
 587 }
 588
 589 /**
 590  *      aac_consumer_free       -       free consumer entry
 591  *      @dev: Adapter
 592  *      @q: Queue
 593  *      @qid: Queue ident
 594  *
 595  *      Frees up the current top of the queue we are a consumer of. If the
 596  *      queue was full notify the producer that the queue is no longer full.
 597  */
 598
 599 void aac_consumer_free(struct aac_dev * dev, struct aac_queue *q, u32 qid)
 600 {
 601         int wasfull = 0;
 602         u32 notify;
 603
 604         if ((le32_to_cpu(*q->headers.producer)+1) == le32_to_cpu(*q->headers.consumer))
 605                 wasfull = 1;
 606
 607         if (le32_to_cpu(*q->headers.consumer) >= q->entries)
 608                 *q->headers.consumer = cpu_to_le32(1);
 609         else
 610                 *q->headers.consumer = cpu_to_le32(le32_to_cpu(*q->headers.consumer)+1);
 611
 612         if (wasfull) {
 613                 switch (qid) {
 614
 615                 case HostNormCmdQueue:
 616                         notify = HostNormCmdNotFull;
 617                         break;
 618                 case HostNormRespQueue:
 619                         notify = HostNormRespNotFull;
 620                         break;
 621                 default:
 622                         BUG();
 623                         return;
 624                 }
 625                 aac_adapter_notify(dev, notify);
 626         }
 627 }
 628
 629 /**
 630  *      aac_fib_adapter_complete        -       complete adapter issued fib
 631  *      @fibptr: fib to complete
 632  *      @size: size of fib
 633  *
 634  *      Will do all necessary work to complete a FIB that was sent from
 635  *      the adapter.
 636  */
 637
 638 int aac_fib_adapter_complete(struct fib *fibptr, unsigned short size)
 639 {
 640         struct hw_fib * hw_fib = fibptr->hw_fib;
 641         struct aac_dev * dev = fibptr->dev;
 642         struct aac_queue * q;
 643         unsigned long nointr = 0;
 644         unsigned long qflags;
 645
 646         if (hw_fib->header.XferState == 0) {
 647                 if (dev->new_comm_interface)
 648                         kfree (hw_fib);
 649                 return 0;
 650         }
 651         /*
 652          *      If we plan to do anything check the structure type first.
 653          */
 654         if ( hw_fib->header.StructType != FIB_MAGIC ) {
 655                 if (dev->new_comm_interface)
 656                         kfree (hw_fib);
 657                 return -EINVAL;
 658         }
 659         /*
 660          *      This block handles the case where the adapter had sent us a
 661          *      command and we have finished processing the command. We
 662          *      call completeFib when we are done processing the command
 663          *      and want to send a response back to the adapter. This will
 664          *      send the completed cdb to the adapter.
 665          */
 666         if (hw_fib->header.XferState & cpu_to_le32(SentFromAdapter)) {
 667                 if (dev->new_comm_interface) {
 668                         kfree (hw_fib);
 669                 } else {
 670                         u32 index;
 671                         hw_fib->header.XferState |= cpu_to_le32(HostProcessed);
 672                         if (size) {
 673                                 size += sizeof(struct aac_fibhdr);
 674                                 if (size > le16_to_cpu(hw_fib->header.SenderSize))
 675                                         return -EMSGSIZE;
 676                                 hw_fib->header.Size = cpu_to_le16(size);
 677                         }
 678                         q = &dev->queues->queue[AdapNormRespQueue];
 679                         spin_lock_irqsave(q->lock, qflags);
 680                         aac_queue_get(dev, &index, AdapNormRespQueue, hw_fib, 1, NULL, &nointr);
 681                         *(q->headers.producer) = cpu_to_le32(index + 1);
 682                         spin_unlock_irqrestore(q->lock, qflags);
 683                         if (!(nointr & (int)aac_config.irq_mod))
 684                                 aac_adapter_notify(dev, AdapNormRespQueue);
 685                 }
 686         }
 687         else
 688         {
 689                 printk(KERN_WARNING "aac_fib_adapter_complete: Unknown xferstate detected.\n");
 690                 BUG();
 691         }
 692         return 0;
 693 }
 694
 695 /**
 696  *      aac_fib_complete        -       fib completion handler
 697  *      @fib: FIB to complete
 698  *
 699  *      Will do all necessary work to complete a FIB.
 700  */
 701
 702 int aac_fib_complete(struct fib *fibptr)
 703 {
 704         struct hw_fib * hw_fib = fibptr->hw_fib;
 705
 706         /*
 707          *      Check for a fib which has already been completed
 708          */
 709
 710         if (hw_fib->header.XferState == 0)
 711                 return 0;
 712         /*
 713          *      If we plan to do anything check the structure type first.
 714          */
 715
 716         if (hw_fib->header.StructType != FIB_MAGIC)
 717                 return -EINVAL;
 718         /*
 719          *      This block completes a cdb which orginated on the host and we
 720          *      just need to deallocate the cdb or reinit it. At this point the
 721          *      command is complete that we had sent to the adapter and this
 722          *      cdb could be reused.
 723          */
 724         if((hw_fib->header.XferState & cpu_to_le32(SentFromHost)) &&
 725                 (hw_fib->header.XferState & cpu_to_le32(AdapterProcessed)))
 726         {
 727                 fib_dealloc(fibptr);
 728         }
 729         else if(hw_fib->header.XferState & cpu_to_le32(SentFromHost))
 730         {
 731                 /*
 732                  *      This handles the case when the host has aborted the I/O
 733                  *      to the adapter because the adapter is not responding
 734                  */
 735                 fib_dealloc(fibptr);
 736         } else if(hw_fib->header.XferState & cpu_to_le32(HostOwned)) {
 737                 fib_dealloc(fibptr);
 738         } else {
 739                 BUG();
 740         }
 741         return 0;
 742 }
 743
 744 /**
 745  *      aac_printf      -       handle printf from firmware
 746  *      @dev: Adapter
 747  *      @val: Message info
 748  *
 749  *      Print a message passed to us by the controller firmware on the
 750  *      Adaptec board
 751  */
 752
 753 void aac_printf(struct aac_dev *dev, u32 val)
 754 {
 755         char *cp = dev->printfbuf;
 756         if (dev->printf_enabled)
 757         {
 758                 int length = val & 0xffff;
 759                 int level = (val >> 16) & 0xffff;
 760
 761                 /*
 762                  *      The size of the printfbuf is set in port.c
 763                  *      There is no variable or define for it
 764                  */
 765                 if (length > 255)
 766                         length = 255;
 767                 if (cp[length] != 0)
 768                         cp[length] = 0;
 769                 if (level == LOG_AAC_HIGH_ERROR)
 770                         printk(KERN_WARNING "%s:%s", dev->name, cp);
 771                 else
 772                         printk(KERN_INFO "%s:%s", dev->name, cp);
 773         }
 774         memset(cp, 0,  256);
 775 }
 776
 777
 778 /**
 779  *      aac_handle_aif          -       Handle a message from the firmware
 780  *      @dev: Which adapter this fib is from
 781  *      @fibptr: Pointer to fibptr from adapter
 782  *
 783  *      This routine handles a driver notify fib from the adapter and
 784  *      dispatches it to the appropriate routine for handling.
 785  */
 786
 787 #define AIF_SNIFF_TIMEOUT       (30*HZ)
 788 static void aac_handle_aif(struct aac_dev * dev, struct fib * fibptr)
 789 {
 790         struct hw_fib * hw_fib = fibptr->hw_fib;
 791         struct aac_aifcmd * aifcmd = (struct aac_aifcmd *)hw_fib->data;
 792         int busy;
 793         u32 container;
 794         struct scsi_device *device;
 795         enum {
 796                 NOTHING,
 797                 DELETE,
 798                 ADD,
 799                 CHANGE
 800         } device_config_needed;
 801
 802         /* Sniff for container changes */
 803
 804         if (!dev)
 805                 return;
 806         container = (u32)-1;
 807
 808         /*
 809          *      We have set this up to try and minimize the number of
 810          * re-configures that take place. As a result of this when
 811          * certain AIF's come in we will set a flag waiting for another
 812          * type of AIF before setting the re-config flag.
 813          */
 814         switch (le32_to_cpu(aifcmd->command)) {
 815         case AifCmdDriverNotify:
 816                 switch (le32_to_cpu(((u32 *)aifcmd->data)[0])) {
 817                 /*
 818                  *      Morph or Expand complete
 819                  */
 820                 case AifDenMorphComplete:
 821                 case AifDenVolumeExtendComplete:
 822                         container = le32_to_cpu(((u32 *)aifcmd->data)[1]);
 823                         if (container >= dev->maximum_num_containers)
 824                                 break;
 825
 826                         /*
 827                          *      Find the scsi_device associated with the SCSI
 828                          * address. Make sure we have the right array, and if
 829                          * so set the flag to initiate a new re-config once we
 830                          * see an AifEnConfigChange AIF come through.
 831                          */
 832
 833                         if ((dev != NULL) && (dev->scsi_host_ptr != NULL)) {
 834                                 device = scsi_device_lookup(dev->scsi_host_ptr,
 835                                         CONTAINER_TO_CHANNEL(container),
 836                                         CONTAINER_TO_ID(container),
 837                                         CONTAINER_TO_LUN(container));
 838                                 if (device) {
 839                                         dev->fsa_dev[container].config_needed = CHANGE;
 840                                         dev->fsa_dev[container].config_waiting_on = AifEnConfigChange;
 841                                         dev->fsa_dev[container].config_waiting_stamp = jiffies;
 842                                         scsi_device_put(device);
 843                                 }
 844                         }
 845                 }
 846
 847                 /*
 848                  *      If we are waiting on something and this happens to be
 849                  * that thing then set the re-configure flag.
 850                  */
 851                 if (container != (u32)-1) {
 852                         if (container >= dev->maximum_num_containers)
 853                                 break;
 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                 } else for (container = 0;
 859                     container < dev->maximum_num_containers; ++container) {
 860                         if ((dev->fsa_dev[container].config_waiting_on ==
 861                             le32_to_cpu(*(u32 *)aifcmd->data)) &&
 862                          time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
 863                                 dev->fsa_dev[container].config_waiting_on = 0;
 864                 }
 865                 break;
 866
 867         case AifCmdEventNotify:
 868                 switch (le32_to_cpu(((u32 *)aifcmd->data)[0])) {
 869                 /*
 870                  *      Add an Array.
 871                  */
 872                 case AifEnAddContainer:
 873                         container = le32_to_cpu(((u32 *)aifcmd->data)[1]);
 874                         if (container >= dev->maximum_num_containers)
 875                                 break;
 876                         dev->fsa_dev[container].config_needed = ADD;
 877                         dev->fsa_dev[container].config_waiting_on =
 878                                 AifEnConfigChange;
 879                         dev->fsa_dev[container].config_waiting_stamp = jiffies;
 880                         break;
 881
 882                 /*
 883                  *      Delete an Array.
 884                  */
 885                 case AifEnDeleteContainer:
 886                         container = le32_to_cpu(((u32 *)aifcmd->data)[1]);
 887                         if (container >= dev->maximum_num_containers)
 888                                 break;
 889                         dev->fsa_dev[container].config_needed = DELETE;
 890                         dev->fsa_dev[container].config_waiting_on =
 891                                 AifEnConfigChange;
 892                         dev->fsa_dev[container].config_waiting_stamp = jiffies;
 893                         break;
 894
 895                 /*
 896                  *      Container change detected. If we currently are not
 897                  * waiting on something else, setup to wait on a Config Change.
 898                  */
 899                 case AifEnContainerChange:
 900                         container = le32_to_cpu(((u32 *)aifcmd->data)[1]);
 901                         if (container >= dev->maximum_num_containers)
 902                                 break;
 903                         if (dev->fsa_dev[container].config_waiting_on &&
 904                          time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
 905                                 break;
 906                         dev->fsa_dev[container].config_needed = CHANGE;
 907                         dev->fsa_dev[container].config_waiting_on =
 908                                 AifEnConfigChange;
 909                         dev->fsa_dev[container].config_waiting_stamp = jiffies;
 910                         break;
 911
 912                 case AifEnConfigChange:
 913                         break;
 914
 915                 }
 916
 917                 /*
 918                  *      If we are waiting on something and this happens to be
 919                  * that thing then set the re-configure flag.
 920                  */
 921                 if (container != (u32)-1) {
 922                         if (container >= dev->maximum_num_containers)
 923                                 break;
 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                 } else for (container = 0;
 929                     container < dev->maximum_num_containers; ++container) {
 930                         if ((dev->fsa_dev[container].config_waiting_on ==
 931                             le32_to_cpu(*(u32 *)aifcmd->data)) &&
 932                          time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT))
 933                                 dev->fsa_dev[container].config_waiting_on = 0;
 934                 }
 935                 break;
 936
 937         case AifCmdJobProgress:
 938                 /*
 939                  *      These are job progress AIF's. When a Clear is being
 940                  * done on a container it is initially created then hidden from
 941                  * the OS. When the clear completes we don't get a config
 942                  * change so we monitor the job status complete on a clear then
 943                  * wait for a container change.
 944                  */
 945
 946                 if ((((u32 *)aifcmd->data)[1] == cpu_to_le32(AifJobCtrZero))
 947                  && ((((u32 *)aifcmd->data)[6] == ((u32 *)aifcmd->data)[5])
 948                   || (((u32 *)aifcmd->data)[4] == cpu_to_le32(AifJobStsSuccess)))) {
 949                         for (container = 0;
 950                             container < dev->maximum_num_containers;
 951                             ++container) {
 952                                 /*
 953                                  * Stomp on all config sequencing for all
 954                                  * containers?
 955                                  */
 956                                 dev->fsa_dev[container].config_waiting_on =
 957                                         AifEnContainerChange;
 958                                 dev->fsa_dev[container].config_needed = ADD;
 959                                 dev->fsa_dev[container].config_waiting_stamp =
 960                                         jiffies;
 961                         }
 962                 }
 963                 if ((((u32 *)aifcmd->data)[1] == cpu_to_le32(AifJobCtrZero))
 964                  && (((u32 *)aifcmd->data)[6] == 0)
 965                  && (((u32 *)aifcmd->data)[4] == cpu_to_le32(AifJobStsRunning))) {
 966                         for (container = 0;
 967                             container < dev->maximum_num_containers;
 968                             ++container) {
 969                                 /*
 970                                  * Stomp on all config sequencing for all
 971                                  * containers?
 972                                  */
 973                                 dev->fsa_dev[container].config_waiting_on =
 974                                         AifEnContainerChange;
 975                                 dev->fsa_dev[container].config_needed = DELETE;
 976                                 dev->fsa_dev[container].config_waiting_stamp =
 977                                         jiffies;
 978                         }
 979                 }
 980                 break;
 981         }
 982
 983         device_config_needed = NOTHING;
 984         for (container = 0; container < dev->maximum_num_containers;
 985             ++container) {
 986                 if ((dev->fsa_dev[container].config_waiting_on == 0) &&
 987                         (dev->fsa_dev[container].config_needed != NOTHING) &&
 988                         time_before(jiffies, dev->fsa_dev[container].config_waiting_stamp + AIF_SNIFF_TIMEOUT)) {
 989                         device_config_needed =
 990                                 dev->fsa_dev[container].config_needed;
 991                         dev->fsa_dev[container].config_needed = NOTHING;
 992                         break;
 993                 }
 994         }
 995         if (device_config_needed == NOTHING)
 996                 return;
 997
 998         /*
 999          *      If we decided that a re-configuration needs to be done,
1000          * schedule it here on the way out the door, please close the door
1001          * behind you.
1002          */
1003
1004         busy = 0;
1005
1006
1007         /*
1008          *      Find the scsi_device associated with the SCSI address,
1009          * and mark it as changed, invalidating the cache. This deals
1010          * with changes to existing device IDs.
1011          */
1012
1013         if (!dev || !dev->scsi_host_ptr)
1014                 return;
1015         /*
1016          * force reload of disk info via aac_probe_container
1017          */
1018         if ((device_config_needed == CHANGE)
1019          && (dev->fsa_dev[container].valid == 1))
1020                 dev->fsa_dev[container].valid = 2;
1021         if ((device_config_needed == CHANGE) ||
1022                         (device_config_needed == ADD))
1023                 aac_probe_container(dev, container);
1024         device = scsi_device_lookup(dev->scsi_host_ptr,
1025                 CONTAINER_TO_CHANNEL(container),
1026                 CONTAINER_TO_ID(container),
1027                 CONTAINER_TO_LUN(container));
1028         if (device) {
1029                 switch (device_config_needed) {
1030                 case DELETE:
1031                         scsi_remove_device(device);
1032                         break;
1033                 case CHANGE:
1034                         if (!dev->fsa_dev[container].valid) {
1035                                 scsi_remove_device(device);
1036                                 break;
1037                         }
1038                         scsi_rescan_device(&device->sdev_gendev);
1039
1040                 default:
1041                         break;
1042                 }
1043                 scsi_device_put(device);
1044         }
1045         if (device_config_needed == ADD) {
1046                 scsi_add_device(dev->scsi_host_ptr,
1047                   CONTAINER_TO_CHANNEL(container),
1048                   CONTAINER_TO_ID(container),
1049                   CONTAINER_TO_LUN(container));
1050         }
1051
1052 }
1053
1054 /**
1055  *      aac_command_thread      -       command processing thread
1056  *      @dev: Adapter to monitor
1057  *
1058  *      Waits on the commandready event in it's queue. When the event gets set
1059  *      it will pull FIBs off it's queue. It will continue to pull FIBs off
1060  *      until the queue is empty. When the queue is empty it will wait for
1061  *      more FIBs.
1062  */
1063
1064 int aac_command_thread(void *data)
1065 {
1066         struct aac_dev *dev = data;
1067         struct hw_fib *hw_fib, *hw_newfib;
1068         struct fib *fib, *newfib;
1069         struct aac_fib_context *fibctx;
1070         unsigned long flags;
1071         DECLARE_WAITQUEUE(wait, current);
1072
1073         /*
1074          *      We can only have one thread per adapter for AIF's.
1075          */
1076         if (dev->aif_thread)
1077                 return -EINVAL;
1078
1079         /*
1080          *      Let the DPC know it has a place to send the AIF's to.
1081          */
1082         dev->aif_thread = 1;
1083         add_wait_queue(&dev->queues->queue[HostNormCmdQueue].cmdready, &wait);
1084         set_current_state(TASK_INTERRUPTIBLE);
1085         dprintk ((KERN_INFO "aac_command_thread start\n"));
1086         while(1)
1087         {
1088                 spin_lock_irqsave(dev->queues->queue[HostNormCmdQueue].lock, flags);
1089                 while(!list_empty(&(dev->queues->queue[HostNormCmdQueue].cmdq))) {
1090                         struct list_head *entry;
1091                         struct aac_aifcmd * aifcmd;
1092
1093                         set_current_state(TASK_RUNNING);
1094
1095                         entry = dev->queues->queue[HostNormCmdQueue].cmdq.next;
1096                         list_del(entry);
1097
1098                         spin_unlock_irqrestore(dev->queues->queue[HostNormCmdQueue].lock, flags);
1099                         fib = list_entry(entry, struct fib, fiblink);
1100                         /*
1101                          *      We will process the FIB here or pass it to a
1102                          *      worker thread that is TBD. We Really can't
1103                          *      do anything at this point since we don't have
1104                          *      anything defined for this thread to do.
1105                          */
1106                         hw_fib = fib->hw_fib;
1107                         memset(fib, 0, sizeof(struct fib));
1108                         fib->type = FSAFS_NTC_FIB_CONTEXT;
1109                         fib->size = sizeof( struct fib );
1110                         fib->hw_fib = hw_fib;
1111                         fib->data = hw_fib->data;
1112                         fib->dev = dev;
1113                         /*
1114                          *      We only handle AifRequest fibs from the adapter.
1115                          */
1116                         aifcmd = (struct aac_aifcmd *) hw_fib->data;
1117                         if (aifcmd->command == cpu_to_le32(AifCmdDriverNotify)) {
1118                                 /* Handle Driver Notify Events */
1119                                 aac_handle_aif(dev, fib);
1120                                 *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
1121                                 aac_fib_adapter_complete(fib, (u16)sizeof(u32));
1122                         } else {
1123                                 struct list_head *entry;
1124                                 /* The u32 here is important and intended. We are using
1125                                    32bit wrapping time to fit the adapter field */
1126
1127                                 u32 time_now, time_last;
1128                                 unsigned long flagv;
1129                                 unsigned num;
1130                                 struct hw_fib ** hw_fib_pool, ** hw_fib_p;
1131                                 struct fib ** fib_pool, ** fib_p;
1132
1133                                 /* Sniff events */
1134                                 if ((aifcmd->command ==
1135                                      cpu_to_le32(AifCmdEventNotify)) ||
1136                                     (aifcmd->command ==
1137                                      cpu_to_le32(AifCmdJobProgress))) {
1138                                         aac_handle_aif(dev, fib);
1139                                 }
1140
1141                                 time_now = jiffies/HZ;
1142
1143                                 /*
1144                                  * Warning: no sleep allowed while
1145                                  * holding spinlock. We take the estimate
1146                                  * and pre-allocate a set of fibs outside the
1147                                  * lock.
1148                                  */
1149                                 num = le32_to_cpu(dev->init->AdapterFibsSize)
1150                                     / sizeof(struct hw_fib); /* some extra */
1151                                 spin_lock_irqsave(&dev->fib_lock, flagv);
1152                                 entry = dev->fib_list.next;
1153                                 while (entry != &dev->fib_list) {
1154                                         entry = entry->next;
1155                                         ++num;
1156                                 }
1157                                 spin_unlock_irqrestore(&dev->fib_lock, flagv);
1158                                 hw_fib_pool = NULL;
1159                                 fib_pool = NULL;
1160                                 if (num
1161                                  && ((hw_fib_pool = kmalloc(sizeof(struct hw_fib *) * num, GFP_KERNEL)))
1162                                  && ((fib_pool = kmalloc(sizeof(struct fib *) * num, GFP_KERNEL)))) {
1163                                         hw_fib_p = hw_fib_pool;
1164                                         fib_p = fib_pool;
1165                                         while (hw_fib_p < &hw_fib_pool[num]) {
1166                                                 if (!(*(hw_fib_p++) = kmalloc(sizeof(struct hw_fib), GFP_KERNEL))) {
1167                                                         --hw_fib_p;
1168                                                         break;
1169                                                 }
1170                                                 if (!(*(fib_p++) = kmalloc(sizeof(struct fib), GFP_KERNEL))) {
1171                                                         kfree(*(--hw_fib_p));
1172                                                         break;
1173                                                 }
1174                                         }
1175                                         if ((num = hw_fib_p - hw_fib_pool) == 0) {
1176                                                 kfree(fib_pool);
1177                                                 fib_pool = NULL;
1178                                                 kfree(hw_fib_pool);
1179                                                 hw_fib_pool = NULL;
1180                                         }
1181                                 } else {
1182                                         kfree(hw_fib_pool);
1183                                         hw_fib_pool = NULL;
1184                                 }
1185                                 spin_lock_irqsave(&dev->fib_lock, flagv);
1186                                 entry = dev->fib_list.next;
1187                                 /*
1188                                  * For each Context that is on the
1189                                  * fibctxList, make a copy of the
1190                                  * fib, and then set the event to wake up the
1191                                  * thread that is waiting for it.
1192                                  */
1193                                 hw_fib_p = hw_fib_pool;
1194                                 fib_p = fib_pool;
1195                                 while (entry != &dev->fib_list) {
1196                                         /*
1197                                          * Extract the fibctx
1198                                          */
1199                                         fibctx = list_entry(entry, struct aac_fib_context, next);
1200                                         /*
1201                                          * Check if the queue is getting
1202                                          * backlogged
1203                                          */
1204                                         if (fibctx->count > 20)
1205                                         {
1206                                                 /*
1207                                                  * It's *not* jiffies folks,
1208                                                  * but jiffies / HZ so do not
1209                                                  * panic ...
1210                                                  */
1211                                                 time_last = fibctx->jiffies;
1212                                                 /*
1213                                                  * Has it been > 2 minutes
1214                                                  * since the last read off
1215                                                  * the queue?
1216                                                  */
1217                                                 if ((time_now - time_last) > 120) {
1218                                                         entry = entry->next;
1219                                                         aac_close_fib_context(dev, fibctx);
1220                                                         continue;
1221                                                 }
1222                                         }
1223                                         /*
1224                                          * Warning: no sleep allowed while
1225                                          * holding spinlock
1226                                          */
1227                                         if (hw_fib_p < &hw_fib_pool[num]) {
1228                                                 hw_newfib = *hw_fib_p;
1229                                                 *(hw_fib_p++) = NULL;
1230                                                 newfib = *fib_p;
1231                                                 *(fib_p++) = NULL;
1232                                                 /*
1233                                                  * Make the copy of the FIB
1234                                                  */
1235                                                 memcpy(hw_newfib, hw_fib, sizeof(struct hw_fib));
1236                                                 memcpy(newfib, fib, sizeof(struct fib));
1237                                                 newfib->hw_fib = hw_newfib;
1238                                                 /*
1239                                                  * Put the FIB onto the
1240                                                  * fibctx's fibs
1241                                                  */
1242                                                 list_add_tail(&newfib->fiblink, &fibctx->fib_list);
1243                                                 fibctx->count++;
1244                                                 /*
1245                                                  * Set the event to wake up the
1246                                                  * thread that is waiting.
1247                                                  */
1248                                                 up(&fibctx->wait_sem);
1249                                         } else {
1250                                                 printk(KERN_WARNING "aifd: didn't allocate NewFib.\n");
1251                                         }
1252                                         entry = entry->next;
1253                                 }
1254                                 /*
1255                                  *      Set the status of this FIB
1256                                  */
1257                                 *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
1258                                 aac_fib_adapter_complete(fib, sizeof(u32));
1259                                 spin_unlock_irqrestore(&dev->fib_lock, flagv);
1260                                 /* Free up the remaining resources */
1261                                 hw_fib_p = hw_fib_pool;
1262                                 fib_p = fib_pool;
1263                                 while (hw_fib_p < &hw_fib_pool[num]) {
1264                                         kfree(*hw_fib_p);
1265                                         kfree(*fib_p);
1266                                         ++fib_p;
1267                                         ++hw_fib_p;
1268                                 }
1269                                 kfree(hw_fib_pool);
1270                                 kfree(fib_pool);
1271                         }
1272                         kfree(fib);
1273                         spin_lock_irqsave(dev->queues->queue[HostNormCmdQueue].lock, flags);
1274                 }
1275                 /*
1276                  *      There are no more AIF's
1277                  */
1278                 spin_unlock_irqrestore(dev->queues->queue[HostNormCmdQueue].lock, flags);
1279                 schedule();
1280
1281                 if (kthread_should_stop())
1282                         break;
1283                 set_current_state(TASK_INTERRUPTIBLE);
1284         }
1285         if (dev->queues)
1286                 remove_wait_queue(&dev->queues->queue[HostNormCmdQueue].cmdready, &wait);
1287         dev->aif_thread = 0;
1288         return 0;
1289 }