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/delay.h>
  41 #include <linux/completion.h>
  42 #include <linux/mm.h>
  43 #include <scsi/scsi_host.h>
  44
  45 #include "aacraid.h"
  46
  47 struct aac_common aac_config = {
  48         .irq_mod = 1
  49 };
  50
  51 static inline int aac_is_msix_mode(struct aac_dev *dev)
  52 {
  53         u32 status;
  54
  55         status = src_readl(dev, MUnit.OMR);
  56         return (status & AAC_INT_MODE_MSIX);
  57 }
  58
  59 static inline void aac_change_to_intx(struct aac_dev *dev)
  60 {
  61         aac_src_access_devreg(dev, AAC_DISABLE_MSIX);
  62         aac_src_access_devreg(dev, AAC_ENABLE_INTX);
  63 }
  64
  65 static int aac_alloc_comm(struct aac_dev *dev, void **commaddr, unsigned long commsize, unsigned long commalign)
  66 {
  67         unsigned char *base;
  68         unsigned long size, align;
  69         const unsigned long fibsize = dev->max_fib_size;
  70         const unsigned long printfbufsiz = 256;
  71         unsigned long host_rrq_size = 0;
  72         struct aac_init *init;
  73         dma_addr_t phys;
  74         unsigned long aac_max_hostphysmempages;
  75
  76         if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE1 ||
  77             dev->comm_interface == AAC_COMM_MESSAGE_TYPE2)
  78                 host_rrq_size = (dev->scsi_host_ptr->can_queue
  79                         + AAC_NUM_MGT_FIB) * sizeof(u32);
  80         size = fibsize + sizeof(struct aac_init) + commsize +
  81                         commalign + printfbufsiz + host_rrq_size;
  82
  83         base = pci_alloc_consistent(dev->pdev, size, &phys);
  84
  85         if(base == NULL)
  86         {
  87                 printk(KERN_ERR "aacraid: unable to create mapping.\n");
  88                 return 0;
  89         }
  90         dev->comm_addr = (void *)base;
  91         dev->comm_phys = phys;
  92         dev->comm_size = size;
  93
  94         if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE1 ||
  95             dev->comm_interface == AAC_COMM_MESSAGE_TYPE2) {
  96                 dev->host_rrq = (u32 *)(base + fibsize);
  97                 dev->host_rrq_pa = phys + fibsize;
  98                 memset(dev->host_rrq, 0, host_rrq_size);
  99         }
 100
 101         dev->init = (struct aac_init *)(base + fibsize + host_rrq_size);
 102         dev->init_pa = phys + fibsize + host_rrq_size;
 103
 104         init = dev->init;
 105
 106         init->InitStructRevision = cpu_to_le32(ADAPTER_INIT_STRUCT_REVISION);
 107         if (dev->max_fib_size != sizeof(struct hw_fib))
 108                 init->InitStructRevision = cpu_to_le32(ADAPTER_INIT_STRUCT_REVISION_4);
 109         init->Sa_MSIXVectors = cpu_to_le32(SA_INIT_NUM_MSIXVECTORS);
 110         init->fsrev = cpu_to_le32(dev->fsrev);
 111
 112         /*
 113          *      Adapter Fibs are the first thing allocated so that they
 114          *      start page aligned
 115          */
 116         dev->aif_base_va = (struct hw_fib *)base;
 117
 118         init->AdapterFibsVirtualAddress = 0;
 119         init->AdapterFibsPhysicalAddress = cpu_to_le32((u32)phys);
 120         init->AdapterFibsSize = cpu_to_le32(fibsize);
 121         init->AdapterFibAlign = cpu_to_le32(sizeof(struct hw_fib));
 122         /*
 123          * number of 4k pages of host physical memory. The aacraid fw needs
 124          * this number to be less than 4gb worth of pages. New firmware doesn't
 125          * have any issues with the mapping system, but older Firmware did, and
 126          * had *troubles* dealing with the math overloading past 32 bits, thus
 127          * we must limit this field.
 128          */
 129         aac_max_hostphysmempages = dma_get_required_mask(&dev->pdev->dev) >> 12;
 130         if (aac_max_hostphysmempages < AAC_MAX_HOSTPHYSMEMPAGES)
 131                 init->HostPhysMemPages = cpu_to_le32(aac_max_hostphysmempages);
 132         else
 133                 init->HostPhysMemPages = cpu_to_le32(AAC_MAX_HOSTPHYSMEMPAGES);
 134
 135         init->InitFlags = cpu_to_le32(INITFLAGS_DRIVER_USES_UTC_TIME |
 136                 INITFLAGS_DRIVER_SUPPORTS_PM);
 137         init->MaxIoCommands = cpu_to_le32(dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB);
 138         init->MaxIoSize = cpu_to_le32(dev->scsi_host_ptr->max_sectors << 9);
 139         init->MaxFibSize = cpu_to_le32(dev->max_fib_size);
 140         init->MaxNumAif = cpu_to_le32(dev->max_num_aif);
 141
 142         if (dev->comm_interface == AAC_COMM_MESSAGE) {
 143                 init->InitFlags |= cpu_to_le32(INITFLAGS_NEW_COMM_SUPPORTED);
 144                 dprintk((KERN_WARNING"aacraid: New Comm Interface enabled\n"));
 145         } else if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE1) {
 146                 init->InitStructRevision = cpu_to_le32(ADAPTER_INIT_STRUCT_REVISION_6);
 147                 init->InitFlags |= cpu_to_le32(INITFLAGS_NEW_COMM_SUPPORTED |
 148                         INITFLAGS_NEW_COMM_TYPE1_SUPPORTED | INITFLAGS_FAST_JBOD_SUPPORTED);
 149                 init->HostRRQ_AddrHigh = cpu_to_le32((u32)((u64)dev->host_rrq_pa >> 32));
 150                 init->HostRRQ_AddrLow = cpu_to_le32((u32)(dev->host_rrq_pa & 0xffffffff));
 151                 dprintk((KERN_WARNING"aacraid: New Comm Interface type1 enabled\n"));
 152         } else if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE2) {
 153                 init->InitStructRevision = cpu_to_le32(ADAPTER_INIT_STRUCT_REVISION_7);
 154                 init->InitFlags |= cpu_to_le32(INITFLAGS_NEW_COMM_SUPPORTED |
 155                         INITFLAGS_NEW_COMM_TYPE2_SUPPORTED | INITFLAGS_FAST_JBOD_SUPPORTED);
 156                 init->HostRRQ_AddrHigh = cpu_to_le32((u32)((u64)dev->host_rrq_pa >> 32));
 157                 init->HostRRQ_AddrLow = cpu_to_le32((u32)(dev->host_rrq_pa & 0xffffffff));
 158                 /* number of MSI-X */
 159                 init->Sa_MSIXVectors = cpu_to_le32(dev->max_msix);
 160                 dprintk((KERN_WARNING"aacraid: New Comm Interface type2 enabled\n"));
 161         }
 162
 163         /*
 164          * Increment the base address by the amount already used
 165          */
 166         base = base + fibsize + host_rrq_size + sizeof(struct aac_init);
 167         phys = (dma_addr_t)((ulong)phys + fibsize + host_rrq_size +
 168                 sizeof(struct aac_init));
 169
 170         /*
 171          *      Align the beginning of Headers to commalign
 172          */
 173         align = (commalign - ((uintptr_t)(base) & (commalign - 1)));
 174         base = base + align;
 175         phys = phys + align;
 176         /*
 177          *      Fill in addresses of the Comm Area Headers and Queues
 178          */
 179         *commaddr = base;
 180         init->CommHeaderAddress = cpu_to_le32((u32)phys);
 181         /*
 182          *      Increment the base address by the size of the CommArea
 183          */
 184         base = base + commsize;
 185         phys = phys + commsize;
 186         /*
 187          *       Place the Printf buffer area after the Fast I/O comm area.
 188          */
 189         dev->printfbuf = (void *)base;
 190         init->printfbuf = cpu_to_le32(phys);
 191         init->printfbufsiz = cpu_to_le32(printfbufsiz);
 192         memset(base, 0, printfbufsiz);
 193         return 1;
 194 }
 195
 196 static void aac_queue_init(struct aac_dev * dev, struct aac_queue * q, u32 *mem, int qsize)
 197 {
 198         atomic_set(&q->numpending, 0);
 199         q->dev = dev;
 200         init_waitqueue_head(&q->cmdready);
 201         INIT_LIST_HEAD(&q->cmdq);
 202         init_waitqueue_head(&q->qfull);
 203         spin_lock_init(&q->lockdata);
 204         q->lock = &q->lockdata;
 205         q->headers.producer = (__le32 *)mem;
 206         q->headers.consumer = (__le32 *)(mem+1);
 207         *(q->headers.producer) = cpu_to_le32(qsize);
 208         *(q->headers.consumer) = cpu_to_le32(qsize);
 209         q->entries = qsize;
 210 }
 211
 212 /**
 213  *      aac_send_shutdown               -       shutdown an adapter
 214  *      @dev: Adapter to shutdown
 215  *
 216  *      This routine will send a VM_CloseAll (shutdown) request to the adapter.
 217  */
 218
 219 int aac_send_shutdown(struct aac_dev * dev)
 220 {
 221         struct fib * fibctx;
 222         struct aac_close *cmd;
 223         int status;
 224
 225         fibctx = aac_fib_alloc(dev);
 226         if (!fibctx)
 227                 return -ENOMEM;
 228         aac_fib_init(fibctx);
 229
 230         mutex_lock(&dev->ioctl_mutex);
 231         dev->adapter_shutdown = 1;
 232         mutex_unlock(&dev->ioctl_mutex);
 233
 234         cmd = (struct aac_close *) fib_data(fibctx);
 235         cmd->command = cpu_to_le32(VM_CloseAll);
 236         cmd->cid = cpu_to_le32(0xfffffffe);
 237
 238         status = aac_fib_send(ContainerCommand,
 239                           fibctx,
 240                           sizeof(struct aac_close),
 241                           FsaNormal,
 242                           -2 /* Timeout silently */, 1,
 243                           NULL, NULL);
 244
 245         if (status >= 0)
 246                 aac_fib_complete(fibctx);
 247         /* FIB should be freed only after getting the response from the F/W */
 248         if (status != -ERESTARTSYS)
 249                 aac_fib_free(fibctx);
 250         if ((dev->pdev->device == PMC_DEVICE_S7 ||
 251              dev->pdev->device == PMC_DEVICE_S8 ||
 252              dev->pdev->device == PMC_DEVICE_S9) &&
 253              dev->msi_enabled)
 254                 aac_src_access_devreg(dev, AAC_ENABLE_INTX);
 255         return status;
 256 }
 257
 258 /**
 259  *      aac_comm_init   -       Initialise FSA data structures
 260  *      @dev:   Adapter to initialise
 261  *
 262  *      Initializes the data structures that are required for the FSA commuication
 263  *      interface to operate.
 264  *      Returns
 265  *              1 - if we were able to init the commuication interface.
 266  *              0 - If there were errors initing. This is a fatal error.
 267  */
 268
 269 static int aac_comm_init(struct aac_dev * dev)
 270 {
 271         unsigned long hdrsize = (sizeof(u32) * NUMBER_OF_COMM_QUEUES) * 2;
 272         unsigned long queuesize = sizeof(struct aac_entry) * TOTAL_QUEUE_ENTRIES;
 273         u32 *headers;
 274         struct aac_entry * queues;
 275         unsigned long size;
 276         struct aac_queue_block * comm = dev->queues;
 277         /*
 278          *      Now allocate and initialize the zone structures used as our
 279          *      pool of FIB context records.  The size of the zone is based
 280          *      on the system memory size.  We also initialize the mutex used
 281          *      to protect the zone.
 282          */
 283         spin_lock_init(&dev->fib_lock);
 284
 285         /*
 286          *      Allocate the physically contiguous space for the commuication
 287          *      queue headers.
 288          */
 289
 290         size = hdrsize + queuesize;
 291
 292         if (!aac_alloc_comm(dev, (void * *)&headers, size, QUEUE_ALIGNMENT))
 293                 return -ENOMEM;
 294
 295         queues = (struct aac_entry *)(((ulong)headers) + hdrsize);
 296
 297         /* Adapter to Host normal priority Command queue */
 298         comm->queue[HostNormCmdQueue].base = queues;
 299         aac_queue_init(dev, &comm->queue[HostNormCmdQueue], headers, HOST_NORM_CMD_ENTRIES);
 300         queues += HOST_NORM_CMD_ENTRIES;
 301         headers += 2;
 302
 303         /* Adapter to Host high priority command queue */
 304         comm->queue[HostHighCmdQueue].base = queues;
 305         aac_queue_init(dev, &comm->queue[HostHighCmdQueue], headers, HOST_HIGH_CMD_ENTRIES);
 306
 307         queues += HOST_HIGH_CMD_ENTRIES;
 308         headers +=2;
 309
 310         /* Host to adapter normal priority command queue */
 311         comm->queue[AdapNormCmdQueue].base = queues;
 312         aac_queue_init(dev, &comm->queue[AdapNormCmdQueue], headers, ADAP_NORM_CMD_ENTRIES);
 313
 314         queues += ADAP_NORM_CMD_ENTRIES;
 315         headers += 2;
 316
 317         /* host to adapter high priority command queue */
 318         comm->queue[AdapHighCmdQueue].base = queues;
 319         aac_queue_init(dev, &comm->queue[AdapHighCmdQueue], headers, ADAP_HIGH_CMD_ENTRIES);
 320
 321         queues += ADAP_HIGH_CMD_ENTRIES;
 322         headers += 2;
 323
 324         /* adapter to host normal priority response queue */
 325         comm->queue[HostNormRespQueue].base = queues;
 326         aac_queue_init(dev, &comm->queue[HostNormRespQueue], headers, HOST_NORM_RESP_ENTRIES);
 327         queues += HOST_NORM_RESP_ENTRIES;
 328         headers += 2;
 329
 330         /* adapter to host high priority response queue */
 331         comm->queue[HostHighRespQueue].base = queues;
 332         aac_queue_init(dev, &comm->queue[HostHighRespQueue], headers, HOST_HIGH_RESP_ENTRIES);
 333
 334         queues += HOST_HIGH_RESP_ENTRIES;
 335         headers += 2;
 336
 337         /* host to adapter normal priority response queue */
 338         comm->queue[AdapNormRespQueue].base = queues;
 339         aac_queue_init(dev, &comm->queue[AdapNormRespQueue], headers, ADAP_NORM_RESP_ENTRIES);
 340
 341         queues += ADAP_NORM_RESP_ENTRIES;
 342         headers += 2;
 343
 344         /* host to adapter high priority response queue */
 345         comm->queue[AdapHighRespQueue].base = queues;
 346         aac_queue_init(dev, &comm->queue[AdapHighRespQueue], headers, ADAP_HIGH_RESP_ENTRIES);
 347
 348         comm->queue[AdapNormCmdQueue].lock = comm->queue[HostNormRespQueue].lock;
 349         comm->queue[AdapHighCmdQueue].lock = comm->queue[HostHighRespQueue].lock;
 350         comm->queue[AdapNormRespQueue].lock = comm->queue[HostNormCmdQueue].lock;
 351         comm->queue[AdapHighRespQueue].lock = comm->queue[HostHighCmdQueue].lock;
 352
 353         return 0;
 354 }
 355
 356 void aac_define_int_mode(struct aac_dev *dev)
 357 {
 358         int i, msi_count, min_msix;
 359
 360         msi_count = i = 0;
 361         /* max. vectors from GET_COMM_PREFERRED_SETTINGS */
 362         if (dev->max_msix == 0 ||
 363             dev->pdev->device == PMC_DEVICE_S6 ||
 364             dev->sync_mode) {
 365                 dev->max_msix = 1;
 366                 dev->vector_cap =
 367                         dev->scsi_host_ptr->can_queue +
 368                         AAC_NUM_MGT_FIB;
 369                 return;
 370         }
 371
 372         /* Don't bother allocating more MSI-X vectors than cpus */
 373         msi_count = min(dev->max_msix,
 374                 (unsigned int)num_online_cpus());
 375
 376         dev->max_msix = msi_count;
 377
 378         if (msi_count > AAC_MAX_MSIX)
 379                 msi_count = AAC_MAX_MSIX;
 380
 381         for (i = 0; i < msi_count; i++)
 382                 dev->msixentry[i].entry = i;
 383
 384         if (msi_count > 1 &&
 385             pci_find_capability(dev->pdev, PCI_CAP_ID_MSIX)) {
 386                 min_msix = 2;
 387                 i = pci_enable_msix_range(dev->pdev,
 388                                     dev->msixentry,
 389                                     min_msix,
 390                                     msi_count);
 391                 if (i > 0) {
 392                         dev->msi_enabled = 1;
 393                         msi_count = i;
 394                 } else {
 395                         dev->msi_enabled = 0;
 396                         dev_err(&dev->pdev->dev,
 397                         "MSIX not supported!! Will try INTX 0x%x.\n", i);
 398                 }
 399         }
 400
 401         if (!dev->msi_enabled)
 402                 dev->max_msix = msi_count = 1;
 403         else {
 404                 if (dev->max_msix > msi_count)
 405                         dev->max_msix = msi_count;
 406         }
 407         dev->vector_cap =
 408                 (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB) /
 409                 msi_count;
 410 }
 411 struct aac_dev *aac_init_adapter(struct aac_dev *dev)
 412 {
 413         u32 status[5];
 414         struct Scsi_Host * host = dev->scsi_host_ptr;
 415         extern int aac_sync_mode;
 416
 417         /*
 418          *      Check the preferred comm settings, defaults from template.
 419          */
 420         dev->management_fib_count = 0;
 421         spin_lock_init(&dev->manage_lock);
 422         spin_lock_init(&dev->sync_lock);
 423         spin_lock_init(&dev->iq_lock);
 424         dev->max_fib_size = sizeof(struct hw_fib);
 425         dev->sg_tablesize = host->sg_tablesize = (dev->max_fib_size
 426                 - sizeof(struct aac_fibhdr)
 427                 - sizeof(struct aac_write) + sizeof(struct sgentry))
 428                         / sizeof(struct sgentry);
 429         dev->comm_interface = AAC_COMM_PRODUCER;
 430         dev->raw_io_interface = dev->raw_io_64 = 0;
 431
 432
 433         /*
 434          * Enable INTX mode, if not done already Enabled
 435          */
 436         if (aac_is_msix_mode(dev)) {
 437                 aac_change_to_intx(dev);
 438                 dev_info(&dev->pdev->dev, "Changed firmware to INTX mode");
 439         }
 440
 441         if ((!aac_adapter_sync_cmd(dev, GET_ADAPTER_PROPERTIES,
 442                 0, 0, 0, 0, 0, 0,
 443                 status+0, status+1, status+2, status+3, NULL)) &&
 444                         (status[0] == 0x00000001)) {
 445                 dev->doorbell_mask = status[3];
 446                 if (status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_64))
 447                         dev->raw_io_64 = 1;
 448                 dev->sync_mode = aac_sync_mode;
 449                 if (dev->a_ops.adapter_comm &&
 450                         (status[1] & le32_to_cpu(AAC_OPT_NEW_COMM))) {
 451                                 dev->comm_interface = AAC_COMM_MESSAGE;
 452                                 dev->raw_io_interface = 1;
 453                         if ((status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_TYPE1))) {
 454                                 /* driver supports TYPE1 (Tupelo) */
 455                                 dev->comm_interface = AAC_COMM_MESSAGE_TYPE1;
 456                         } else if ((status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_TYPE2))) {
 457                                 /* driver supports TYPE2 (Denali) */
 458                                 dev->comm_interface = AAC_COMM_MESSAGE_TYPE2;
 459                         } else if ((status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_TYPE4)) ||
 460                                   (status[1] & le32_to_cpu(AAC_OPT_NEW_COMM_TYPE3))) {
 461                                 /* driver doesn't TYPE3 and TYPE4 */
 462                                 /* switch to sync. mode */
 463                                 dev->comm_interface = AAC_COMM_MESSAGE_TYPE2;
 464                                 dev->sync_mode = 1;
 465                         }
 466                 }
 467                 if ((dev->comm_interface == AAC_COMM_MESSAGE) &&
 468                     (status[2] > dev->base_size)) {
 469                         aac_adapter_ioremap(dev, 0);
 470                         dev->base_size = status[2];
 471                         if (aac_adapter_ioremap(dev, status[2])) {
 472                                 /* remap failed, go back ... */
 473                                 dev->comm_interface = AAC_COMM_PRODUCER;
 474                                 if (aac_adapter_ioremap(dev, AAC_MIN_FOOTPRINT_SIZE)) {
 475                                         printk(KERN_WARNING
 476                                           "aacraid: unable to map adapter.\n");
 477                                         return NULL;
 478                                 }
 479                         }
 480                 }
 481         }
 482         dev->max_msix = 0;
 483         dev->msi_enabled = 0;
 484         dev->adapter_shutdown = 0;
 485         if ((!aac_adapter_sync_cmd(dev, GET_COMM_PREFERRED_SETTINGS,
 486           0, 0, 0, 0, 0, 0,
 487           status+0, status+1, status+2, status+3, status+4))
 488          && (status[0] == 0x00000001)) {
 489                 /*
 490                  *      status[1] >> 16         maximum command size in KB
 491                  *      status[1] & 0xFFFF      maximum FIB size
 492                  *      status[2] >> 16         maximum SG elements to driver
 493                  *      status[2] & 0xFFFF      maximum SG elements from driver
 494                  *      status[3] & 0xFFFF      maximum number FIBs outstanding
 495                  */
 496                 host->max_sectors = (status[1] >> 16) << 1;
 497                 /* Multiple of 32 for PMC */
 498                 dev->max_fib_size = status[1] & 0xFFE0;
 499                 host->sg_tablesize = status[2] >> 16;
 500                 dev->sg_tablesize = status[2] & 0xFFFF;
 501                 if (dev->pdev->device == PMC_DEVICE_S7 ||
 502                     dev->pdev->device == PMC_DEVICE_S8 ||
 503                     dev->pdev->device == PMC_DEVICE_S9)
 504                         host->can_queue = ((status[3] >> 16) ? (status[3] >> 16) :
 505                                 (status[3] & 0xFFFF)) - AAC_NUM_MGT_FIB;
 506                 else
 507                         host->can_queue = (status[3] & 0xFFFF) - AAC_NUM_MGT_FIB;
 508                 dev->max_num_aif = status[4] & 0xFFFF;
 509                 /*
 510                  *      NOTE:
 511                  *      All these overrides are based on a fixed internal
 512                  *      knowledge and understanding of existing adapters,
 513                  *      acbsize should be set with caution.
 514                  */
 515                 if (acbsize == 512) {
 516                         host->max_sectors = AAC_MAX_32BIT_SGBCOUNT;
 517                         dev->max_fib_size = 512;
 518                         dev->sg_tablesize = host->sg_tablesize
 519                           = (512 - sizeof(struct aac_fibhdr)
 520                             - sizeof(struct aac_write) + sizeof(struct sgentry))
 521                              / sizeof(struct sgentry);
 522                         host->can_queue = AAC_NUM_IO_FIB;
 523                 } else if (acbsize == 2048) {
 524                         host->max_sectors = 512;
 525                         dev->max_fib_size = 2048;
 526                         host->sg_tablesize = 65;
 527                         dev->sg_tablesize = 81;
 528                         host->can_queue = 512 - AAC_NUM_MGT_FIB;
 529                 } else if (acbsize == 4096) {
 530                         host->max_sectors = 1024;
 531                         dev->max_fib_size = 4096;
 532                         host->sg_tablesize = 129;
 533                         dev->sg_tablesize = 166;
 534                         host->can_queue = 256 - AAC_NUM_MGT_FIB;
 535                 } else if (acbsize == 8192) {
 536                         host->max_sectors = 2048;
 537                         dev->max_fib_size = 8192;
 538                         host->sg_tablesize = 257;
 539                         dev->sg_tablesize = 337;
 540                         host->can_queue = 128 - AAC_NUM_MGT_FIB;
 541                 } else if (acbsize > 0) {
 542                         printk("Illegal acbsize=%d ignored\n", acbsize);
 543                 }
 544         }
 545         {
 546
 547                 if (numacb > 0) {
 548                         if (numacb < host->can_queue)
 549                                 host->can_queue = numacb;
 550                         else
 551                                 printk("numacb=%d ignored\n", numacb);
 552                 }
 553         }
 554
 555         if (host->can_queue > AAC_NUM_IO_FIB)
 556                 host->can_queue = AAC_NUM_IO_FIB;
 557
 558         if (dev->pdev->device == PMC_DEVICE_S6 ||
 559             dev->pdev->device == PMC_DEVICE_S7 ||
 560             dev->pdev->device == PMC_DEVICE_S8 ||
 561             dev->pdev->device == PMC_DEVICE_S9)
 562                 aac_define_int_mode(dev);
 563         /*
 564          *      Ok now init the communication subsystem
 565          */
 566
 567         dev->queues = kzalloc(sizeof(struct aac_queue_block), GFP_KERNEL);
 568         if (dev->queues == NULL) {
 569                 printk(KERN_ERR "Error could not allocate comm region.\n");
 570                 return NULL;
 571         }
 572
 573         if (aac_comm_init(dev)<0){
 574                 kfree(dev->queues);
 575                 return NULL;
 576         }
 577         /*
 578          *      Initialize the list of fibs
 579          */
 580         if (aac_fib_setup(dev) < 0) {
 581                 kfree(dev->queues);
 582                 return NULL;
 583         }
 584
 585         INIT_LIST_HEAD(&dev->fib_list);
 586         INIT_LIST_HEAD(&dev->sync_fib_list);
 587
 588         return dev;
 589 }
 590