drivers/scsi/aacraid/comminit.c

   1 /*
   2  *      Adaptec AAC series RAID controller driver
   3  *      (c) Copyright 2001 Red Hat Inc.
   4  *
   5  * based on the old aacraid driver that is..
   6  * Adaptec aacraid device driver for Linux.
   7  *
   8  * Copyright (c) 2000-2010 Adaptec, Inc.
   9  *               2010 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; see the file COPYING.  If not, write to
  23  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Module Name:
  26  *  comminit.c
  27  *
  28  * Abstract: This supports the initialization of the host adapter commuication interface.
  29  *    This is a platform dependent module for the pci cyclone board.
  30  *
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/init.h>
  35 #include <linux/types.h>
  36 #include <linux/pci.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/slab.h>
  39 #include <linux/blkdev.h>
  40 #include <linux/completion.h>
  41 #include <linux/mm.h>
  42 #include <scsi/scsi_host.h>
  43
  44 #include "aacraid.h"
  45
  46 struct aac_common aac_config = {
  47         .irq_mod = 1
  48 };
  49
  50 static int aac_alloc_comm(struct aac_dev *dev, void **commaddr, unsigned long commsize, unsigned long commalign)
  51 {
  52         unsigned char *base;
  53         unsigned long size, align;
  54         const unsigned long fibsize = dev->max_fib_size;
  55         const unsigned long printfbufsiz = 256;
  56         unsigned long host_rrq_size = 0;
  57         struct aac_init *init;
  58         dma_addr_t phys;
  59         unsigned long aac_max_hostphysmempages;
  60
  61         if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE1 ||
  62             dev->comm_interface == AAC_COMM_MESSAGE_TYPE2)
  63                 host_rrq_size = (dev->scsi_host_ptr->can_queue
  64                         + AAC_NUM_MGT_FIB) * sizeof(u32);
  65         size = fibsize + sizeof(struct aac_init) + commsize +
  66                         commalign + printfbufsiz + host_rrq_size;
  67
  68         base = pci_alloc_consistent(dev->pdev, size, &phys);
  69
  70         if(base == NULL)
  71         {
  72                 printk(KERN_ERR "aacraid: unable to create mapping.\n");
  73                 return 0;
  74         }
  75         dev->comm_addr = (void *)base;
  76         dev->comm_phys = phys;
  77         dev->comm_size = size;
  78
  79         if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE1 ||
  80             dev->comm_interface == AAC_COMM_MESSAGE_TYPE2) {
  81                 dev->host_rrq = (u32 *)(base + fibsize);
  82                 dev->host_rrq_pa = phys + fibsize;
  83                 memset(dev->host_rrq, 0, host_rrq_size);
  84         }
  85
  86         dev->init = (struct aac_init *)(base + fibsize + host_rrq_size);
  87         dev->init_pa = phys + fibsize + host_rrq_size;
  88
  89         init = dev->init;
  90
  91         init->InitStructRevision = cpu_to_le32(ADAPTER_INIT_STRUCT_REVISION);
  92         if (dev->max_fib_size != sizeof(struct hw_fib))
  93                 init->InitStructRevision = cpu_to_le32(ADAPTER_INIT_STRUCT_REVISION_4);
  94         init->Sa_MSIXVectors = cpu_to_le32(Sa_MINIPORT_REVISION);
  95         init->fsrev = cpu_to_le32(dev->fsrev);
  96
  97         /*
  98          *      Adapter Fibs are the first thing allocated so that they
  99          *      start page aligned
 100          */
 101         dev->aif_base_va = (struct hw_fib *)base;
 102
 103         init->AdapterFibsVirtualAddress = 0;
 104         init->AdapterFibsPhysicalAddress = cpu_to_le32((u32)phys);
 105         init->AdapterFibsSize = cpu_to_le32(fibsize);
 106         init->AdapterFibAlign = cpu_to_le32(sizeof(struct hw_fib));
 107         /*
 108          * number of 4k pages of host physical memory. The aacraid fw needs
 109          * this number to be less than 4gb worth of pages. New firmware doesn't
 110          * have any issues with the mapping system, but older Firmware did, and
 111          * had *troubles* dealing with the math overloading past 32 bits, thus
 112          * we must limit this field.
 113          */
 114         aac_max_hostphysmempages = dma_get_required_mask(&dev->pdev->dev) >> 12;
 115         if (aac_max_hostphysmempages < AAC_MAX_HOSTPHYSMEMPAGES)
 116                 init->HostPhysMemPages = cpu_to_le32(aac_max_hostphysmempages);
 117         else
 118                 init->HostPhysMemPages = cpu_to_le32(AAC_MAX_HOSTPHYSMEMPAGES);
 119
 120         init->InitFlags = cpu_to_le32(INITFLAGS_DRIVER_USES_UTC_TIME |
 121                 INITFLAGS_DRIVER_SUPPORTS_PM);
 122         init->MaxIoCommands = cpu_to_le32(dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB);
 123         init->MaxIoSize = cpu_to_le32(dev->scsi_host_ptr->max_sectors << 9);
 124         init->MaxFibSize = cpu_to_le32(dev->max_fib_size);
 125         init->MaxNumAif = cpu_to_le32(dev->max_num_aif);
 126
 127         if (dev->comm_interface == AAC_COMM_MESSAGE) {
 128                 init->InitFlags |= cpu_to_le32(INITFLAGS_NEW_COMM_SUPPORTED);
 129                 dprintk((KERN_WARNING"aacraid: New Comm Interface enabled\n"));
 130         } else if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE1) {
 131                 init->InitStructRevision = cpu_to_le32(ADAPTER_INIT_STRUCT_REVISION_6);
 132                 init->InitFlags |= cpu_to_le32(INITFLAGS_NEW_COMM_SUPPORTED |
 133                         INITFLAGS_NEW_COMM_TYPE1_SUPPORTED | INITFLAGS_FAST_JBOD_SUPPORTED);
 134                 init->HostRRQ_AddrHigh = cpu_to_le32((u32)((u64)dev->host_rrq_pa >> 32));
 135                 init->HostRRQ_AddrLow = cpu_to_le32((u32)(dev->host_rrq_pa & 0xffffffff));
 136                 dprintk((KERN_WARNING"aacraid: New Comm Interface type1 enabled\n"));
 137         } else if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE2) {
 138                 init->InitStructRevision = cpu_to_le32(ADAPTER_INIT_STRUCT_REVISION_7);
 139                 init->InitFlags |= cpu_to_le32(INITFLAGS_NEW_COMM_SUPPORTED |
 140                         INITFLAGS_NEW_COMM_TYPE2_SUPPORTED | INITFLAGS_FAST_JBOD_SUPPORTED);
 141                 init->HostRRQ_AddrHigh = cpu_to_le32((u32)((u64)dev->host_rrq_pa >> 32));
 142                 init->HostRRQ_AddrLow = cpu_to_le32((u32)(dev->host_rrq_pa & 0xffffffff));
 143                 /* number of MSI-X */
 144                 init->Sa_MSIXVectors = cpu_to_le32(dev->max_msix);
 145                 dprintk((KERN_WARNING"aacraid: New Comm Interface type2 enabled\n"));
 146         }
 147
 148         /*
 149          * Increment the base address by the amount already used
 150          */
 151         base = base + fibsize + host_rrq_size + sizeof(struct aac_init);
 152         phys = (dma_addr_t)((ulong)phys + fibsize + host_rrq_size +
 153                 sizeof(struct aac_init));
 154
 155         /*
 156          *      Align the beginning of Headers to commalign
 157          */
 158         align = (commalign - ((uintptr_t)(base) & (commalign - 1)));
 159         base = base + align;
 160         phys = phys + align;
 161         /*
 162          *      Fill in addresses of the Comm Area Headers and Queues
 163          */
 164         *commaddr = base;
 165         init->CommHeaderAddress = cpu_to_le32((u32)phys);
 166         /*
 167          *      Increment the base address by the size of the CommArea
 168          */
 169         base = base + commsize;
 170         phys = phys + commsize;
 171         /*
 172          *       Place the Printf buffer area after the Fast I/O comm area.
 173          */
 174         dev->printfbuf = (void *)base;
 175         init->printfbuf = cpu_to_le32(phys);
 176         init->printfbufsiz = cpu_to_le32(printfbufsiz);
 177         memset(base, 0, printfbufsiz);
 178         return 1;
 179 }
 180
 181 static void aac_queue_init(struct aac_dev * dev, struct aac_queue * q, u32 *mem, int qsize)
 182 {
 183         atomic_set(&q->numpending, 0);
 184         q->dev = dev;
 185         init_waitqueue_head(&q->cmdready);
 186         INIT_LIST_HEAD(&q->cmdq);
 187         init_waitqueue_head(&q->qfull);
 188         spin_lock_init(&q->lockdata);
 189         q->lock = &q->lockdata;
 190         q->headers.producer = (__le32 *)mem;
 191         q->headers.consumer = (__le32 *)(mem+1);
 192         *(q->headers.producer) = cpu_to_le32(qsize);
 193         *(q->headers.consumer) = cpu_to_le32(qsize);
 194         q->entries = qsize;
 195 }
 196
 197 /**
 198  *      aac_send_shutdown               -       shutdown an adapter
 199  *      @dev: Adapter to shutdown
 200  *
 201  *      This routine will send a VM_CloseAll (shutdown) request to the adapter.
 202  */
 203
 204 int aac_send_shutdown(struct aac_dev * dev)
 205 {
 206         struct fib * fibctx;
 207         struct aac_close *cmd;
 208         int status;
 209
 210         fibctx = aac_fib_alloc(dev);
 211         if (!fibctx)
 212                 return -ENOMEM;
 213         aac_fib_init(fibctx);
 214
 215         cmd = (struct aac_close *) fib_data(fibctx);
 216
 217         cmd->command = cpu_to_le32(VM_CloseAll);
 218         cmd->cid = cpu_to_le32(0xfffffffe);
 219
 220         status = aac_fib_send(ContainerCommand,
 221                           fibctx,
 222                           sizeof(struct aac_close),
 223                           FsaNormal,
 224                           -2 /* Timeout silently */, 1,
 225                           NULL, NULL);
 226
 227         if (status >= 0)
 228                 aac_fib_complete(fibctx);
 229         /* FIB should be freed only after getting the response from the F/W */
 230         if (status != -ERESTARTSYS)
 231                 aac_fib_free(fibctx);
 232         dev->adapter_shutdown = 1;
 233         if ((dev->pdev->device == PMC_DEVICE_S7 ||
 234              dev->pdev->device == PMC_DEVICE_S8 ||
 235              dev->pdev->device == PMC_DEVICE_S9) &&
 236              dev->msi_enabled)
 237                 aac_src_access_devreg(dev, AAC_ENABLE_INTX);
 238         return status;
 239 }
 240
 241 /**
 242  *      aac_comm_init   -       Initialise FSA data structures
 243  *      @dev:   Adapter to initialise
 244  *
 245  *      Initializes the data structures that are required for the FSA commuication
 246  *      interface to operate.
 247  *      Returns
 248  *              1 - if we were able to init the commuication interface.
 249  *              0 - If there were errors initing. This is a fatal error.
 250  */
 251
 252 static int aac_comm_init(struct aac_dev * dev)
 253 {
 254         unsigned long hdrsize = (sizeof(u32) * NUMBER_OF_COMM_QUEUES) * 2;
 255         unsigned long queuesize = sizeof(struct aac_entry) * TOTAL_QUEUE_ENTRIES;
 256         u32 *headers;
 257         struct aac_entry * queues;
 258         unsigned long size;
 259         struct aac_queue_block * comm = dev->queues;
 260         /*
 261          *      Now allocate and initialize the zone structures used as our
 262          *      pool of FIB context records.  The size of the zone is based
 263          *      on the system memory size.  We also initialize the mutex used
 264          *      to protect the zone.
 265          */
 266         spin_lock_init(&dev->fib_lock);
 267
 268         /*
 269          *      Allocate the physically contiguous space for the commuication
 270          *      queue headers.
 271          */
 272
 273         size = hdrsize + queuesize;
 274
 275         if (!aac_alloc_comm(dev, (void * *)&headers, size, QUEUE_ALIGNMENT))
 276                 return -ENOMEM;
 277
 278         queues = (struct aac_entry *)(((ulong)headers) + hdrsize);
 279
 280         /* Adapter to Host normal priority Command queue */
 281         comm->queue[HostNormCmdQueue].base = queues;
 282         aac_queue_init(dev, &comm->queue[HostNormCmdQueue], headers, HOST_NORM_CMD_ENTRIES);
 283         queues += HOST_NORM_CMD_ENTRIES;
 284         headers += 2;
 285
 286         /* Adapter to Host high priority command queue */
 287         comm->queue[HostHighCmdQueue].base = queues;
 288         aac_queue_init(dev, &comm->queue[HostHighCmdQueue], headers, HOST_HIGH_CMD_ENTRIES);
 289
 290         queues += HOST_HIGH_CMD_ENTRIES;
 291         headers +=2;
 292
 293         /* Host to adapter normal priority command queue */
 294         comm->queue[AdapNormCmdQueue].base = queues;
 295         aac_queue_init(dev, &comm->queue[AdapNormCmdQueue], headers, ADAP_NORM_CMD_ENTRIES);
 296
 297         queues += ADAP_NORM_CMD_ENTRIES;
 298         headers += 2;
 299
 300         /* host to adapter high priority command queue */
 301         comm->queue[AdapHighCmdQueue].base = queues;
 302         aac_queue_init(dev, &comm->queue[AdapHighCmdQueue], headers, ADAP_HIGH_CMD_ENTRIES);
 303
 304         queues += ADAP_HIGH_CMD_ENTRIES;
 305         headers += 2;
 306
 307         /* adapter to host normal priority response queue */
 308         comm->queue[HostNormRespQueue].base = queues;
 309         aac_queue_init(dev, &comm->queue[HostNormRespQueue], headers, HOST_NORM_RESP_ENTRIES);
 310         queues += HOST_NORM_RESP_ENTRIES;
 311         headers += 2;
 312
 313         /* adapter to host high priority response queue */
 314         comm->queue[HostHighRespQueue].base = queues;
 315         aac_queue_init(dev, &comm->queue[HostHighRespQueue], headers, HOST_HIGH_RESP_ENTRIES);
 316
 317         queues += HOST_HIGH_RESP_ENTRIES;
 318         headers += 2;
 319
 320         /* host to adapter normal priority response queue */
 321         comm->queue[AdapNormRespQueue].base = queues;
 322         aac_queue_init(dev, &comm->queue[AdapNormRespQueue], headers, ADAP_NORM_RESP_ENTRIES);
 323
 324         queues += ADAP_NORM_RESP_ENTRIES;
 325         headers += 2;
 326
 327         /* host to adapter high priority response queue */
 328         comm->queue[AdapHighRespQueue].base = queues;
 329         aac_queue_init(dev, &comm->queue[AdapHighRespQueue], headers, ADAP_HIGH_RESP_ENTRIES);
 330
 331         comm->queue[AdapNormCmdQueue].lock = comm->queue[HostNormRespQueue].lock;
 332         comm->queue[AdapHighCmdQueue].lock = comm->queue[HostHighRespQueue].lock;
 333         comm->queue[AdapNormRespQueue].lock = comm->queue[HostNormCmdQueue].lock;
 334         comm->queue[AdapHighRespQueue].lock = comm->queue[HostHighCmdQueue].lock;
 335
 336         return 0;
 337 }
 338
 339 void aac_define_int_mode(struct aac_dev *dev)
 340 {
 341         int i, msi_count;
 342
 343         msi_count = i = 0;
 344         /* max. vectors from GET_COMM_PREFERRED_SETTINGS */
 345         if (dev->max_msix == 0 ||
 346             dev->pdev->device == PMC_DEVICE_S6 ||
 347             dev->sync_mode) {
 348                 dev->max_msix = 1;
 349                 dev->vector_cap =
 350                         dev->scsi_host_ptr->can_queue +
 351                         AAC_NUM_MGT_FIB;
 352                 return;
 353         }
 354
 355         /* Don't bother allocating more MSI-X vectors than cpus */
 356         msi_count = min(dev->max_msix,
 357                 (unsigned int)num_online_cpus());
 358
 359         dev->max_msix = msi_count;
 360
 361         if (msi_count > AAC_MAX_MSIX)
 362                 msi_count = AAC_MAX_MSIX;
 363
 364         for (i = 0; i < msi_count; i++)
 365                 dev->msixentry[i].entry = i;
 366
 367         if (msi_count > 1 &&
 368             pci_find_capability(dev->pdev, PCI_CAP_ID_MSIX)) {
 369                 i = pci_enable_msix(dev->pdev,
 370                                     dev->msixentry,
 371                                     msi_count);
 372                  /* Check how many MSIX vectors are allocated */
 373                 if (i >= 0) {
 374                         dev->msi_enabled = 1;
 375                         if (i) {
 376                                 msi_count = i;
 377                                 if (pci_enable_msix(dev->pdev,
 378                                     dev->msixentry,
 379                                     msi_count)) {
 380                                         dev->msi_enabled = 0;
 381                                         printk(KERN_ERR "%s%d: MSIX not supported!! Will try MSI 0x%x.\n",
 382                                                         dev->name, dev->id, i);
 383                                 }
 384                         }
 385                 } else {
 386                         dev->msi_enabled = 0;
 387                         printk(KERN_ERR "%s%d: MSIX not supported!! Will try MSI 0x%x.\n",
 388                                         dev->name, dev->id, i);
 389                 }
 390         }
 391
 392         if (!dev->msi_enabled) {
 393                 msi_count = 1;
 394                 i = pci_enable_msi(dev->pdev);
 395
 396                 if (!i) {
 397                         dev->msi_enabled = 1;
 398                         dev->msi = 1;
 399                 } else {
 400                         printk(KERN_ERR "%s%d: MSI not supported!! Will try INTx 0x%x.\n",
 401                                         dev->name, dev->id, i);
 402                 }
 403         }
 404
 405         if (!dev->msi_enabled)
 406                 dev->max_msix = msi_count = 1;
 407         else {
 408                 if (dev->max_msix > msi_count)
 409                         dev->max_msix = msi_count;
 410         }
 411         dev->vector_cap =
 412                 (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB) /
 413                 msi_count;
 414 }
 415 struct aac_dev *aac_init_adapter(struct aac_dev *dev)
 416 {
 417         u32 status[5];
 418         struct Scsi_Host * host = dev->scsi_host_ptr;
 419         extern int aac_sync_mode;
 420
 421         /*
 422          *      Check the preferred comm settings, defaults from template.
 423          */
 424         dev->management_fib_count = 0;
 425         spin_lock_init(&dev->manage_lock);
 426         spin_lock_init(&dev->sync_lock);
 427         dev->max_fib_size = sizeof(struct hw_fib);
 428         dev->sg_tablesize = host->sg_tablesize = (dev->max_fib_size
 429                 - sizeof(struct aac_fibhdr)
 430                 - sizeof(struct aac_write) + sizeof(struct sgentry))
 431                         / sizeof(struct sgentry);
 432         dev->comm_interface = AAC_COMM_PRODUCER;
 433         dev->raw_io_interface = dev->raw_io_64 = 0;
 434
 435         if ((!aac_adapter_sync_cmd(dev, GET_ADAPTER_PROPERTIES,
 436                 0, 0, 0, 0, 0, 0,
 437                 status+0, status+1, status+2, status+3, NULL)) &&
 438                         (status[0] == 0x00000001)) {
 439                 dev->doorbell_mask = status[3];
 440                 if (status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_64))
 441                         dev->raw_io_64 = 1;
 442                 dev->sync_mode = aac_sync_mode;
 443                 if (dev->a_ops.adapter_comm &&
 444                         (status[1] & le32_to_cpu(AAC_OPT_NEW_COMM))) {
 445                                 dev->comm_interface = AAC_COMM_MESSAGE;
 446                                 dev->raw_io_interface = 1;
 447                         if ((status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_TYPE1))) {
 448                                 /* driver supports TYPE1 (Tupelo) */
 449                                 dev->comm_interface = AAC_COMM_MESSAGE_TYPE1;
 450                         } else if ((status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_TYPE2))) {
 451                                 /* driver supports TYPE2 (Denali) */
 452                                 dev->comm_interface = AAC_COMM_MESSAGE_TYPE2;
 453                         } else if ((status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_TYPE4)) ||
 454                                   (status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_TYPE3))) {
 455                                 /* driver doesn't TYPE3 and TYPE4 */
 456                                 /* switch to sync. mode */
 457                                 dev->comm_interface = AAC_COMM_MESSAGE_TYPE2;
 458                                 dev->sync_mode = 1;
 459                         }
 460                 }
 461                 if ((dev->comm_interface == AAC_COMM_MESSAGE) &&
 462                     (status[2] > dev->base_size)) {
 463                         aac_adapter_ioremap(dev, 0);
 464                         dev->base_size = status[2];
 465                         if (aac_adapter_ioremap(dev, status[2])) {
 466                                 /* remap failed, go back ... */
 467                                 dev->comm_interface = AAC_COMM_PRODUCER;
 468                                 if (aac_adapter_ioremap(dev, AAC_MIN_FOOTPRINT_SIZE)) {
 469                                         printk(KERN_WARNING
 470                                           "aacraid: unable to map adapter.\n");
 471                                         return NULL;
 472                                 }
 473                         }
 474                 }
 475         }
 476         dev->max_msix = 0;
 477         dev->msi_enabled = 0;
 478         dev->adapter_shutdown = 0;
 479         if ((!aac_adapter_sync_cmd(dev, GET_COMM_PREFERRED_SETTINGS,
 480           0, 0, 0, 0, 0, 0,
 481           status+0, status+1, status+2, status+3, status+4))
 482          && (status[0] == 0x00000001)) {
 483                 /*
 484                  *      status[1] >> 16         maximum command size in KB
 485                  *      status[1] & 0xFFFF      maximum FIB size
 486                  *      status[2] >> 16         maximum SG elements to driver
 487                  *      status[2] & 0xFFFF      maximum SG elements from driver
 488                  *      status[3] & 0xFFFF      maximum number FIBs outstanding
 489                  */
 490                 host->max_sectors = (status[1] >> 16) << 1;
 491                 /* Multiple of 32 for PMC */
 492                 dev->max_fib_size = status[1] & 0xFFE0;
 493                 host->sg_tablesize = status[2] >> 16;
 494                 dev->sg_tablesize = status[2] & 0xFFFF;
 495                 if (dev->pdev->device == PMC_DEVICE_S7 ||
 496                     dev->pdev->device == PMC_DEVICE_S8 ||
 497                     dev->pdev->device == PMC_DEVICE_S9)
 498                         host->can_queue = ((status[3] >> 16) ? (status[3] >> 16) :
 499                                 (status[3] & 0xFFFF)) - AAC_NUM_MGT_FIB;
 500                 else
 501                         host->can_queue = (status[3] & 0xFFFF) - AAC_NUM_MGT_FIB;
 502                 dev->max_num_aif = status[4] & 0xFFFF;
 503                 /*
 504                  *      NOTE:
 505                  *      All these overrides are based on a fixed internal
 506                  *      knowledge and understanding of existing adapters,
 507                  *      acbsize should be set with caution.
 508                  */
 509                 if (acbsize == 512) {
 510                         host->max_sectors = AAC_MAX_32BIT_SGBCOUNT;
 511                         dev->max_fib_size = 512;
 512                         dev->sg_tablesize = host->sg_tablesize
 513                           = (512 - sizeof(struct aac_fibhdr)
 514                             - sizeof(struct aac_write) + sizeof(struct sgentry))
 515                              / sizeof(struct sgentry);
 516                         host->can_queue = AAC_NUM_IO_FIB;
 517                 } else if (acbsize == 2048) {
 518                         host->max_sectors = 512;
 519                         dev->max_fib_size = 2048;
 520                         host->sg_tablesize = 65;
 521                         dev->sg_tablesize = 81;
 522                         host->can_queue = 512 - AAC_NUM_MGT_FIB;
 523                 } else if (acbsize == 4096) {
 524                         host->max_sectors = 1024;
 525                         dev->max_fib_size = 4096;
 526                         host->sg_tablesize = 129;
 527                         dev->sg_tablesize = 166;
 528                         host->can_queue = 256 - AAC_NUM_MGT_FIB;
 529                 } else if (acbsize == 8192) {
 530                         host->max_sectors = 2048;
 531                         dev->max_fib_size = 8192;
 532                         host->sg_tablesize = 257;
 533                         dev->sg_tablesize = 337;
 534                         host->can_queue = 128 - AAC_NUM_MGT_FIB;
 535                 } else if (acbsize > 0) {
 536                         printk("Illegal acbsize=%d ignored\n", acbsize);
 537                 }
 538         }
 539         {
 540
 541                 if (numacb > 0) {
 542                         if (numacb < host->can_queue)
 543                                 host->can_queue = numacb;
 544                         else
 545                                 printk("numacb=%d ignored\n", numacb);
 546                 }
 547         }
 548
 549         if (host->can_queue > AAC_NUM_IO_FIB)
 550                 host->can_queue = AAC_NUM_IO_FIB;
 551
 552         if (dev->pdev->device == PMC_DEVICE_S6 ||
 553             dev->pdev->device == PMC_DEVICE_S7 ||
 554             dev->pdev->device == PMC_DEVICE_S8 ||
 555             dev->pdev->device == PMC_DEVICE_S9)
 556                 aac_define_int_mode(dev);
 557         /*
 558          *      Ok now init the communication subsystem
 559          */
 560
 561         dev->queues = kzalloc(sizeof(struct aac_queue_block), GFP_KERNEL);
 562         if (dev->queues == NULL) {
 563                 printk(KERN_ERR "Error could not allocate comm region.\n");
 564                 return NULL;
 565         }
 566
 567         if (aac_comm_init(dev)<0){
 568                 kfree(dev->queues);
 569                 return NULL;
 570         }
 571         /*
 572          *      Initialize the list of fibs
 573          */
 574         if (aac_fib_setup(dev) < 0) {
 575                 kfree(dev->queues);
 576                 return NULL;
 577         }
 578
 579         INIT_LIST_HEAD(&dev->fib_list);
 580         INIT_LIST_HEAD(&dev->sync_fib_list);
 581
 582         return dev;
 583 }
 584