drivers/target/target_core_pscsi.c

   1 /*******************************************************************************
   2  * Filename:  target_core_pscsi.c
   3  *
   4  * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
   5  *
   6  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/string.h>
  30 #include <linux/parser.h>
  31 #include <linux/timer.h>
  32 #include <linux/blkdev.h>
  33 #include <linux/blk_types.h>
  34 #include <linux/slab.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/genhd.h>
  37 #include <linux/cdrom.h>
  38 #include <linux/ratelimit.h>
  39 #include <linux/module.h>
  40 #include <asm/unaligned.h>
  41
  42 #include <scsi/scsi.h>
  43 #include <scsi/scsi_device.h>
  44 #include <scsi/scsi_cmnd.h>
  45 #include <scsi/scsi_host.h>
  46 #include <scsi/scsi_tcq.h>
  47
  48 #include <target/target_core_base.h>
  49 #include <target/target_core_backend.h>
  50
  51 #include "target_core_alua.h"
  52 #include "target_core_pscsi.h"
  53
  54 #define ISPRINT(a)  ((a >= ' ') && (a <= '~'))
  55
  56 static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
  57 {
  58         return container_of(dev, struct pscsi_dev_virt, dev);
  59 }
  60
  61 static struct se_subsystem_api pscsi_template;
  62
  63 static int pscsi_execute_cmd(struct se_cmd *cmd);
  64 static void pscsi_req_done(struct request *, int);
  65
  66 /*      pscsi_attach_hba():
  67  *
  68  *      pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
  69  *      from the passed SCSI Host ID.
  70  */
  71 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
  72 {
  73         struct pscsi_hba_virt *phv;
  74
  75         phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
  76         if (!phv) {
  77                 pr_err("Unable to allocate struct pscsi_hba_virt\n");
  78                 return -ENOMEM;
  79         }
  80         phv->phv_host_id = host_id;
  81         phv->phv_mode = PHV_VIRTUAL_HOST_ID;
  82
  83         hba->hba_ptr = phv;
  84
  85         pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
  86                 " Generic Target Core Stack %s\n", hba->hba_id,
  87                 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
  88         pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
  89                hba->hba_id);
  90
  91         return 0;
  92 }
  93
  94 static void pscsi_detach_hba(struct se_hba *hba)
  95 {
  96         struct pscsi_hba_virt *phv = hba->hba_ptr;
  97         struct Scsi_Host *scsi_host = phv->phv_lld_host;
  98
  99         if (scsi_host) {
 100                 scsi_host_put(scsi_host);
 101
 102                 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
 103                         " Generic Target Core\n", hba->hba_id,
 104                         (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
 105                         "Unknown");
 106         } else
 107                 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
 108                         " from Generic Target Core\n", hba->hba_id);
 109
 110         kfree(phv);
 111         hba->hba_ptr = NULL;
 112 }
 113
 114 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
 115 {
 116         struct pscsi_hba_virt *phv = hba->hba_ptr;
 117         struct Scsi_Host *sh = phv->phv_lld_host;
 118         /*
 119          * Release the struct Scsi_Host
 120          */
 121         if (!mode_flag) {
 122                 if (!sh)
 123                         return 0;
 124
 125                 phv->phv_lld_host = NULL;
 126                 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
 127
 128                 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
 129                         " %s\n", hba->hba_id, (sh->hostt->name) ?
 130                         (sh->hostt->name) : "Unknown");
 131
 132                 scsi_host_put(sh);
 133                 return 0;
 134         }
 135         /*
 136          * Otherwise, locate struct Scsi_Host from the original passed
 137          * pSCSI Host ID and enable for phba mode
 138          */
 139         sh = scsi_host_lookup(phv->phv_host_id);
 140         if (IS_ERR(sh)) {
 141                 pr_err("pSCSI: Unable to locate SCSI Host for"
 142                         " phv_host_id: %d\n", phv->phv_host_id);
 143                 return PTR_ERR(sh);
 144         }
 145
 146         phv->phv_lld_host = sh;
 147         phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
 148
 149         pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
 150                 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
 151
 152         return 1;
 153 }
 154
 155 static void pscsi_tape_read_blocksize(struct se_device *dev,
 156                 struct scsi_device *sdev)
 157 {
 158         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 159         int ret;
 160
 161         buf = kzalloc(12, GFP_KERNEL);
 162         if (!buf)
 163                 return;
 164
 165         memset(cdb, 0, MAX_COMMAND_SIZE);
 166         cdb[0] = MODE_SENSE;
 167         cdb[4] = 0x0c; /* 12 bytes */
 168
 169         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
 170                         HZ, 1, NULL);
 171         if (ret)
 172                 goto out_free;
 173
 174         /*
 175          * If MODE_SENSE still returns zero, set the default value to 1024.
 176          */
 177         sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
 178         if (!sdev->sector_size)
 179                 sdev->sector_size = 1024;
 180 out_free:
 181         kfree(buf);
 182 }
 183
 184 static void
 185 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
 186 {
 187         unsigned char *buf;
 188
 189         if (sdev->inquiry_len < INQUIRY_LEN)
 190                 return;
 191
 192         buf = sdev->inquiry;
 193         if (!buf)
 194                 return;
 195         /*
 196          * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
 197          */
 198         memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
 199         memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
 200         memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
 201 }
 202
 203 static int
 204 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
 205 {
 206         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 207         int ret;
 208
 209         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 210         if (!buf)
 211                 return -ENOMEM;
 212
 213         memset(cdb, 0, MAX_COMMAND_SIZE);
 214         cdb[0] = INQUIRY;
 215         cdb[1] = 0x01; /* Query VPD */
 216         cdb[2] = 0x80; /* Unit Serial Number */
 217         cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
 218         cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
 219
 220         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 221                               INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
 222         if (ret)
 223                 goto out_free;
 224
 225         snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
 226
 227         wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL;
 228
 229         kfree(buf);
 230         return 0;
 231
 232 out_free:
 233         kfree(buf);
 234         return -EPERM;
 235 }
 236
 237 static void
 238 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
 239                 struct t10_wwn *wwn)
 240 {
 241         unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
 242         int ident_len, page_len, off = 4, ret;
 243         struct t10_vpd *vpd;
 244
 245         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 246         if (!buf)
 247                 return;
 248
 249         memset(cdb, 0, MAX_COMMAND_SIZE);
 250         cdb[0] = INQUIRY;
 251         cdb[1] = 0x01; /* Query VPD */
 252         cdb[2] = 0x83; /* Device Identifier */
 253         cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
 254         cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
 255
 256         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 257                               INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
 258                               NULL, HZ, 1, NULL);
 259         if (ret)
 260                 goto out;
 261
 262         page_len = (buf[2] << 8) | buf[3];
 263         while (page_len > 0) {
 264                 /* Grab a pointer to the Identification descriptor */
 265                 page_83 = &buf[off];
 266                 ident_len = page_83[3];
 267                 if (!ident_len) {
 268                         pr_err("page_83[3]: identifier"
 269                                         " length zero!\n");
 270                         break;
 271                 }
 272                 pr_debug("T10 VPD Identifier Length: %d\n", ident_len);
 273
 274                 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
 275                 if (!vpd) {
 276                         pr_err("Unable to allocate memory for"
 277                                         " struct t10_vpd\n");
 278                         goto out;
 279                 }
 280                 INIT_LIST_HEAD(&vpd->vpd_list);
 281
 282                 transport_set_vpd_proto_id(vpd, page_83);
 283                 transport_set_vpd_assoc(vpd, page_83);
 284
 285                 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
 286                         off += (ident_len + 4);
 287                         page_len -= (ident_len + 4);
 288                         kfree(vpd);
 289                         continue;
 290                 }
 291                 if (transport_set_vpd_ident(vpd, page_83) < 0) {
 292                         off += (ident_len + 4);
 293                         page_len -= (ident_len + 4);
 294                         kfree(vpd);
 295                         continue;
 296                 }
 297
 298                 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
 299                 off += (ident_len + 4);
 300                 page_len -= (ident_len + 4);
 301         }
 302
 303 out:
 304         kfree(buf);
 305 }
 306
 307 static int pscsi_add_device_to_list(struct se_device *dev,
 308                 struct scsi_device *sd)
 309 {
 310         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 311         struct request_queue *q = sd->request_queue;
 312
 313         pdv->pdv_sd = sd;
 314
 315         if (!sd->queue_depth) {
 316                 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
 317
 318                 pr_err("Set broken SCSI Device %d:%d:%d"
 319                         " queue_depth to %d\n", sd->channel, sd->id,
 320                                 sd->lun, sd->queue_depth);
 321         }
 322
 323         dev->dev_attrib.hw_block_size = sd->sector_size;
 324         dev->dev_attrib.hw_max_sectors =
 325                 min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
 326         dev->dev_attrib.hw_queue_depth = sd->queue_depth;
 327
 328         /*
 329          * Setup our standard INQUIRY info into se_dev->t10_wwn
 330          */
 331         pscsi_set_inquiry_info(sd, &dev->t10_wwn);
 332
 333         /*
 334          * Locate VPD WWN Information used for various purposes within
 335          * the Storage Engine.
 336          */
 337         if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) {
 338                 /*
 339                  * If VPD Unit Serial returned GOOD status, try
 340                  * VPD Device Identification page (0x83).
 341                  */
 342                 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn);
 343         }
 344
 345         /*
 346          * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
 347          */
 348         if (sd->type == TYPE_TAPE)
 349                 pscsi_tape_read_blocksize(dev, sd);
 350         return 0;
 351 }
 352
 353 static struct se_device *pscsi_alloc_device(struct se_hba *hba,
 354                 const char *name)
 355 {
 356         struct pscsi_dev_virt *pdv;
 357
 358         pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
 359         if (!pdv) {
 360                 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
 361                 return NULL;
 362         }
 363
 364         pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
 365         return &pdv->dev;
 366 }
 367
 368 /*
 369  * Called with struct Scsi_Host->host_lock called.
 370  */
 371 static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
 372         __releases(sh->host_lock)
 373 {
 374         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 375         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 376         struct Scsi_Host *sh = sd->host;
 377         struct block_device *bd;
 378         int ret;
 379
 380         if (scsi_device_get(sd)) {
 381                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 382                         sh->host_no, sd->channel, sd->id, sd->lun);
 383                 spin_unlock_irq(sh->host_lock);
 384                 return -EIO;
 385         }
 386         spin_unlock_irq(sh->host_lock);
 387         /*
 388          * Claim exclusive struct block_device access to struct scsi_device
 389          * for TYPE_DISK using supplied udev_path
 390          */
 391         bd = blkdev_get_by_path(dev->udev_path,
 392                                 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
 393         if (IS_ERR(bd)) {
 394                 pr_err("pSCSI: blkdev_get_by_path() failed\n");
 395                 scsi_device_put(sd);
 396                 return PTR_ERR(bd);
 397         }
 398         pdv->pdv_bd = bd;
 399
 400         ret = pscsi_add_device_to_list(dev, sd);
 401         if (ret) {
 402                 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 403                 scsi_device_put(sd);
 404                 return ret;
 405         }
 406
 407         pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
 408                 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
 409         return 0;
 410 }
 411
 412 /*
 413  * Called with struct Scsi_Host->host_lock called.
 414  */
 415 static int pscsi_create_type_rom(struct se_device *dev, struct scsi_device *sd)
 416         __releases(sh->host_lock)
 417 {
 418         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 419         struct Scsi_Host *sh = sd->host;
 420         int ret;
 421
 422         if (scsi_device_get(sd)) {
 423                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 424                         sh->host_no, sd->channel, sd->id, sd->lun);
 425                 spin_unlock_irq(sh->host_lock);
 426                 return -EIO;
 427         }
 428         spin_unlock_irq(sh->host_lock);
 429
 430         ret = pscsi_add_device_to_list(dev, sd);
 431         if (ret) {
 432                 scsi_device_put(sd);
 433                 return ret;
 434         }
 435         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 436                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 437                 sd->channel, sd->id, sd->lun);
 438
 439         return 0;
 440 }
 441
 442 /*
 443  * Called with struct Scsi_Host->host_lock called.
 444  */
 445 static int pscsi_create_type_other(struct se_device *dev,
 446                 struct scsi_device *sd)
 447         __releases(sh->host_lock)
 448 {
 449         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 450         struct Scsi_Host *sh = sd->host;
 451         int ret;
 452
 453         spin_unlock_irq(sh->host_lock);
 454         ret = pscsi_add_device_to_list(dev, sd);
 455         if (ret)
 456                 return ret;
 457
 458         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 459                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 460                 sd->channel, sd->id, sd->lun);
 461         return 0;
 462 }
 463
 464 int pscsi_configure_device(struct se_device *dev)
 465 {
 466         struct se_hba *hba = dev->se_hba;
 467         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 468         struct scsi_device *sd;
 469         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 470         struct Scsi_Host *sh = phv->phv_lld_host;
 471         int legacy_mode_enable = 0;
 472         int ret;
 473
 474         if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
 475             !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
 476             !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
 477                 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
 478                         " scsi_lun_id= parameters\n");
 479                 return -EINVAL;
 480         }
 481
 482         /*
 483          * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
 484          * struct Scsi_Host we will need to bring the TCM/pSCSI object online
 485          */
 486         if (!sh) {
 487                 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 488                         pr_err("pSCSI: Unable to locate struct"
 489                                 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
 490                         return -ENODEV;
 491                 }
 492                 /*
 493                  * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
 494                  * reference, we enforce that udev_path has been set
 495                  */
 496                 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
 497                         pr_err("pSCSI: udev_path attribute has not"
 498                                 " been set before ENABLE=1\n");
 499                         return -EINVAL;
 500                 }
 501                 /*
 502                  * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
 503                  * use the original TCM hba ID to reference Linux/SCSI Host No
 504                  * and enable for PHV_LLD_SCSI_HOST_NO mode.
 505                  */
 506                 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
 507                         if (hba->dev_count) {
 508                                 pr_err("pSCSI: Unable to set hba_mode"
 509                                         " with active devices\n");
 510                                 return -EEXIST;
 511                         }
 512
 513                         if (pscsi_pmode_enable_hba(hba, 1) != 1)
 514                                 return -ENODEV;
 515
 516                         legacy_mode_enable = 1;
 517                         hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
 518                         sh = phv->phv_lld_host;
 519                 } else {
 520                         sh = scsi_host_lookup(pdv->pdv_host_id);
 521                         if (IS_ERR(sh)) {
 522                                 pr_err("pSCSI: Unable to locate"
 523                                         " pdv_host_id: %d\n", pdv->pdv_host_id);
 524                                 return PTR_ERR(sh);
 525                         }
 526                 }
 527         } else {
 528                 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
 529                         pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
 530                                 " struct Scsi_Host exists\n");
 531                         return -EEXIST;
 532                 }
 533         }
 534
 535         spin_lock_irq(sh->host_lock);
 536         list_for_each_entry(sd, &sh->__devices, siblings) {
 537                 if ((pdv->pdv_channel_id != sd->channel) ||
 538                     (pdv->pdv_target_id != sd->id) ||
 539                     (pdv->pdv_lun_id != sd->lun))
 540                         continue;
 541                 /*
 542                  * Functions will release the held struct scsi_host->host_lock
 543                  * before calling calling pscsi_add_device_to_list() to register
 544                  * struct scsi_device with target_core_mod.
 545                  */
 546                 switch (sd->type) {
 547                 case TYPE_DISK:
 548                         ret = pscsi_create_type_disk(dev, sd);
 549                         break;
 550                 case TYPE_ROM:
 551                         ret = pscsi_create_type_rom(dev, sd);
 552                         break;
 553                 default:
 554                         ret = pscsi_create_type_other(dev, sd);
 555                         break;
 556                 }
 557
 558                 if (ret) {
 559                         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 560                                 scsi_host_put(sh);
 561                         else if (legacy_mode_enable) {
 562                                 pscsi_pmode_enable_hba(hba, 0);
 563                                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 564                         }
 565                         pdv->pdv_sd = NULL;
 566                         return ret;
 567                 }
 568                 return 0;
 569         }
 570         spin_unlock_irq(sh->host_lock);
 571
 572         pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
 573                 pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);
 574
 575         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 576                 scsi_host_put(sh);
 577         else if (legacy_mode_enable) {
 578                 pscsi_pmode_enable_hba(hba, 0);
 579                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 580         }
 581
 582         return -ENODEV;
 583 }
 584
 585 static void pscsi_free_device(struct se_device *dev)
 586 {
 587         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 588         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 589         struct scsi_device *sd = pdv->pdv_sd;
 590
 591         if (sd) {
 592                 /*
 593                  * Release exclusive pSCSI internal struct block_device claim for
 594                  * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
 595                  */
 596                 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
 597                         blkdev_put(pdv->pdv_bd,
 598                                    FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 599                         pdv->pdv_bd = NULL;
 600                 }
 601                 /*
 602                  * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
 603                  * to struct Scsi_Host now.
 604                  */
 605                 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
 606                     (phv->phv_lld_host != NULL))
 607                         scsi_host_put(phv->phv_lld_host);
 608
 609                 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
 610                         scsi_device_put(sd);
 611
 612                 pdv->pdv_sd = NULL;
 613         }
 614
 615         kfree(pdv);
 616 }
 617
 618 static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
 619                                      unsigned char *sense_buffer)
 620 {
 621         struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
 622         struct scsi_device *sd = pdv->pdv_sd;
 623         int result;
 624         struct pscsi_plugin_task *pt = cmd->priv;
 625         unsigned char *cdb;
 626         /*
 627          * Special case for REPORT_LUNs handling where pscsi_plugin_task has
 628          * not been allocated because TCM is handling the emulation directly.
 629          */
 630         if (!pt)
 631                 return;
 632
 633         cdb = &pt->pscsi_cdb[0];
 634         result = pt->pscsi_result;
 635         /*
 636          * Hack to make sure that Write-Protect modepage is set if R/O mode is
 637          * forced.
 638          */
 639         if (!cmd->se_deve || !cmd->data_length)
 640                 goto after_mode_sense;
 641
 642         if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
 643              (status_byte(result) << 1) == SAM_STAT_GOOD) {
 644                 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
 645                         unsigned char *buf = transport_kmap_data_sg(cmd);
 646
 647                         if (cdb[0] == MODE_SENSE_10) {
 648                                 if (!(buf[3] & 0x80))
 649                                         buf[3] |= 0x80;
 650                         } else {
 651                                 if (!(buf[2] & 0x80))
 652                                         buf[2] |= 0x80;
 653                         }
 654
 655                         transport_kunmap_data_sg(cmd);
 656                 }
 657         }
 658 after_mode_sense:
 659
 660         if (sd->type != TYPE_TAPE || !cmd->data_length)
 661                 goto after_mode_select;
 662
 663         /*
 664          * Hack to correctly obtain the initiator requested blocksize for
 665          * TYPE_TAPE.  Since this value is dependent upon each tape media,
 666          * struct scsi_device->sector_size will not contain the correct value
 667          * by default, so we go ahead and set it so
 668          * TRANSPORT(dev)->get_blockdev() returns the correct value to the
 669          * storage engine.
 670          */
 671         if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
 672               (status_byte(result) << 1) == SAM_STAT_GOOD) {
 673                 unsigned char *buf;
 674                 u16 bdl;
 675                 u32 blocksize;
 676
 677                 buf = sg_virt(&sg[0]);
 678                 if (!buf) {
 679                         pr_err("Unable to get buf for scatterlist\n");
 680                         goto after_mode_select;
 681                 }
 682
 683                 if (cdb[0] == MODE_SELECT)
 684                         bdl = (buf[3]);
 685                 else
 686                         bdl = (buf[6] << 8) | (buf[7]);
 687
 688                 if (!bdl)
 689                         goto after_mode_select;
 690
 691                 if (cdb[0] == MODE_SELECT)
 692                         blocksize = (buf[9] << 16) | (buf[10] << 8) |
 693                                         (buf[11]);
 694                 else
 695                         blocksize = (buf[13] << 16) | (buf[14] << 8) |
 696                                         (buf[15]);
 697
 698                 sd->sector_size = blocksize;
 699         }
 700 after_mode_select:
 701
 702         if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
 703                 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
 704                 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 705         }
 706 }
 707
 708 enum {
 709         Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
 710         Opt_scsi_lun_id, Opt_err
 711 };
 712
 713 static match_table_t tokens = {
 714         {Opt_scsi_host_id, "scsi_host_id=%d"},
 715         {Opt_scsi_channel_id, "scsi_channel_id=%d"},
 716         {Opt_scsi_target_id, "scsi_target_id=%d"},
 717         {Opt_scsi_lun_id, "scsi_lun_id=%d"},
 718         {Opt_err, NULL}
 719 };
 720
 721 static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev,
 722                 const char *page, ssize_t count)
 723 {
 724         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 725         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 726         char *orig, *ptr, *opts;
 727         substring_t args[MAX_OPT_ARGS];
 728         int ret = 0, arg, token;
 729
 730         opts = kstrdup(page, GFP_KERNEL);
 731         if (!opts)
 732                 return -ENOMEM;
 733
 734         orig = opts;
 735
 736         while ((ptr = strsep(&opts, ",\n")) != NULL) {
 737                 if (!*ptr)
 738                         continue;
 739
 740                 token = match_token(ptr, tokens, args);
 741                 switch (token) {
 742                 case Opt_scsi_host_id:
 743                         if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 744                                 pr_err("PSCSI[%d]: Unable to accept"
 745                                         " scsi_host_id while phv_mode =="
 746                                         " PHV_LLD_SCSI_HOST_NO\n",
 747                                         phv->phv_host_id);
 748                                 ret = -EINVAL;
 749                                 goto out;
 750                         }
 751                         match_int(args, &arg);
 752                         pdv->pdv_host_id = arg;
 753                         pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
 754                                 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
 755                         pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
 756                         break;
 757                 case Opt_scsi_channel_id:
 758                         match_int(args, &arg);
 759                         pdv->pdv_channel_id = arg;
 760                         pr_debug("PSCSI[%d]: Referencing SCSI Channel"
 761                                 " ID: %d\n",  phv->phv_host_id,
 762                                 pdv->pdv_channel_id);
 763                         pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
 764                         break;
 765                 case Opt_scsi_target_id:
 766                         match_int(args, &arg);
 767                         pdv->pdv_target_id = arg;
 768                         pr_debug("PSCSI[%d]: Referencing SCSI Target"
 769                                 " ID: %d\n", phv->phv_host_id,
 770                                 pdv->pdv_target_id);
 771                         pdv->pdv_flags |= PDF_HAS_TARGET_ID;
 772                         break;
 773                 case Opt_scsi_lun_id:
 774                         match_int(args, &arg);
 775                         pdv->pdv_lun_id = arg;
 776                         pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
 777                                 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
 778                         pdv->pdv_flags |= PDF_HAS_LUN_ID;
 779                         break;
 780                 default:
 781                         break;
 782                 }
 783         }
 784
 785 out:
 786         kfree(orig);
 787         return (!ret) ? count : ret;
 788 }
 789
 790 static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
 791 {
 792         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 793         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 794         struct scsi_device *sd = pdv->pdv_sd;
 795         unsigned char host_id[16];
 796         ssize_t bl;
 797         int i;
 798
 799         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 800                 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
 801         else
 802                 snprintf(host_id, 16, "PHBA Mode");
 803
 804         bl = sprintf(b, "SCSI Device Bus Location:"
 805                 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
 806                 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
 807                 host_id);
 808
 809         if (sd) {
 810                 bl += sprintf(b + bl, "        ");
 811                 bl += sprintf(b + bl, "Vendor: ");
 812                 for (i = 0; i < 8; i++) {
 813                         if (ISPRINT(sd->vendor[i]))   /* printable character? */
 814                                 bl += sprintf(b + bl, "%c", sd->vendor[i]);
 815                         else
 816                                 bl += sprintf(b + bl, " ");
 817                 }
 818                 bl += sprintf(b + bl, " Model: ");
 819                 for (i = 0; i < 16; i++) {
 820                         if (ISPRINT(sd->model[i]))   /* printable character ? */
 821                                 bl += sprintf(b + bl, "%c", sd->model[i]);
 822                         else
 823                                 bl += sprintf(b + bl, " ");
 824                 }
 825                 bl += sprintf(b + bl, " Rev: ");
 826                 for (i = 0; i < 4; i++) {
 827                         if (ISPRINT(sd->rev[i]))   /* printable character ? */
 828                                 bl += sprintf(b + bl, "%c", sd->rev[i]);
 829                         else
 830                                 bl += sprintf(b + bl, " ");
 831                 }
 832                 bl += sprintf(b + bl, "\n");
 833         }
 834         return bl;
 835 }
 836
 837 static void pscsi_bi_endio(struct bio *bio, int error)
 838 {
 839         bio_put(bio);
 840 }
 841
 842 static inline struct bio *pscsi_get_bio(int sg_num)
 843 {
 844         struct bio *bio;
 845         /*
 846          * Use bio_malloc() following the comment in for bio -> struct request
 847          * in block/blk-core.c:blk_make_request()
 848          */
 849         bio = bio_kmalloc(GFP_KERNEL, sg_num);
 850         if (!bio) {
 851                 pr_err("PSCSI: bio_kmalloc() failed\n");
 852                 return NULL;
 853         }
 854         bio->bi_end_io = pscsi_bi_endio;
 855
 856         return bio;
 857 }
 858
 859 static int pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl,
 860                 u32 sgl_nents, enum dma_data_direction data_direction,
 861                 struct bio **hbio)
 862 {
 863         struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
 864         struct bio *bio = NULL, *tbio = NULL;
 865         struct page *page;
 866         struct scatterlist *sg;
 867         u32 data_len = cmd->data_length, i, len, bytes, off;
 868         int nr_pages = (cmd->data_length + sgl[0].offset +
 869                         PAGE_SIZE - 1) >> PAGE_SHIFT;
 870         int nr_vecs = 0, rc;
 871         int rw = (data_direction == DMA_TO_DEVICE);
 872
 873         *hbio = NULL;
 874
 875         pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
 876
 877         for_each_sg(sgl, sg, sgl_nents, i) {
 878                 page = sg_page(sg);
 879                 off = sg->offset;
 880                 len = sg->length;
 881
 882                 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
 883                         page, len, off);
 884
 885                 while (len > 0 && data_len > 0) {
 886                         bytes = min_t(unsigned int, len, PAGE_SIZE - off);
 887                         bytes = min(bytes, data_len);
 888
 889                         if (!bio) {
 890                                 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
 891                                 nr_pages -= nr_vecs;
 892                                 /*
 893                                  * Calls bio_kmalloc() and sets bio->bi_end_io()
 894                                  */
 895                                 bio = pscsi_get_bio(nr_vecs);
 896                                 if (!bio)
 897                                         goto fail;
 898
 899                                 if (rw)
 900                                         bio->bi_rw |= REQ_WRITE;
 901
 902                                 pr_debug("PSCSI: Allocated bio: %p,"
 903                                         " dir: %s nr_vecs: %d\n", bio,
 904                                         (rw) ? "rw" : "r", nr_vecs);
 905                                 /*
 906                                  * Set *hbio pointer to handle the case:
 907                                  * nr_pages > BIO_MAX_PAGES, where additional
 908                                  * bios need to be added to complete a given
 909                                  * command.
 910                                  */
 911                                 if (!*hbio)
 912                                         *hbio = tbio = bio;
 913                                 else
 914                                         tbio = tbio->bi_next = bio;
 915                         }
 916
 917                         pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
 918                                 " bio: %p page: %p len: %d off: %d\n", i, bio,
 919                                 page, len, off);
 920
 921                         rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
 922                                         bio, page, bytes, off);
 923                         if (rc != bytes)
 924                                 goto fail;
 925
 926                         pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
 927                                 bio->bi_vcnt, nr_vecs);
 928
 929                         if (bio->bi_vcnt > nr_vecs) {
 930                                 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
 931                                         " %d i: %d bio: %p, allocating another"
 932                                         " bio\n", bio->bi_vcnt, i, bio);
 933                                 /*
 934                                  * Clear the pointer so that another bio will
 935                                  * be allocated with pscsi_get_bio() above, the
 936                                  * current bio has already been set *tbio and
 937                                  * bio->bi_next.
 938                                  */
 939                                 bio = NULL;
 940                         }
 941
 942                         page++;
 943                         len -= bytes;
 944                         data_len -= bytes;
 945                         off = 0;
 946                 }
 947         }
 948
 949         return sgl_nents;
 950 fail:
 951         while (*hbio) {
 952                 bio = *hbio;
 953                 *hbio = (*hbio)->bi_next;
 954                 bio->bi_next = NULL;
 955                 bio_endio(bio, 0);      /* XXX: should be error */
 956         }
 957         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 958         return -ENOMEM;
 959 }
 960
 961 /*
 962  * Clear a lun set in the cdb if the initiator talking to use spoke
 963  * and old standards version, as we can't assume the underlying device
 964  * won't choke up on it.
 965  */
 966 static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
 967 {
 968         switch (cdb[0]) {
 969         case READ_10: /* SBC - RDProtect */
 970         case READ_12: /* SBC - RDProtect */
 971         case READ_16: /* SBC - RDProtect */
 972         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
 973         case VERIFY: /* SBC - VRProtect */
 974         case VERIFY_16: /* SBC - VRProtect */
 975         case WRITE_VERIFY: /* SBC - VRProtect */
 976         case WRITE_VERIFY_12: /* SBC - VRProtect */
 977         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
 978                 break;
 979         default:
 980                 cdb[1] &= 0x1f; /* clear logical unit number */
 981                 break;
 982         }
 983 }
 984
 985 static int pscsi_parse_cdb(struct se_cmd *cmd)
 986 {
 987         unsigned char *cdb = cmd->t_task_cdb;
 988         unsigned int dummy_size;
 989         int ret;
 990
 991         if (cmd->se_cmd_flags & SCF_BIDI) {
 992                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 993                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
 994                 return -EINVAL;
 995         }
 996
 997         pscsi_clear_cdb_lun(cdb);
 998
 999         /*
1000          * For REPORT LUNS we always need to emulate the response, for everything
1001          * else the default for pSCSI is to pass the command to the underlying
1002          * LLD / physical hardware.
1003          */
1004         switch (cdb[0]) {
1005         case REPORT_LUNS:
1006                 ret = spc_parse_cdb(cmd, &dummy_size);
1007                 if (ret)
1008                         return ret;
1009                 break;
1010         case READ_6:
1011         case READ_10:
1012         case READ_12:
1013         case READ_16:
1014         case WRITE_6:
1015         case WRITE_10:
1016         case WRITE_12:
1017         case WRITE_16:
1018         case WRITE_VERIFY:
1019                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1020                 /* FALLTHROUGH*/
1021         default:
1022                 cmd->execute_cmd = pscsi_execute_cmd;
1023                 break;
1024         }
1025
1026         return 0;
1027 }
1028
1029 static int pscsi_execute_cmd(struct se_cmd *cmd)
1030 {
1031         struct scatterlist *sgl = cmd->t_data_sg;
1032         u32 sgl_nents = cmd->t_data_nents;
1033         enum dma_data_direction data_direction = cmd->data_direction;
1034         struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
1035         struct pscsi_plugin_task *pt;
1036         struct request *req;
1037         struct bio *hbio;
1038         int ret;
1039
1040         /*
1041          * Dynamically alloc cdb space, since it may be larger than
1042          * TCM_MAX_COMMAND_SIZE
1043          */
1044         pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1045         if (!pt) {
1046                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1047                 return -ENOMEM;
1048         }
1049         cmd->priv = pt;
1050
1051         memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1052                 scsi_command_size(cmd->t_task_cdb));
1053
1054         if (!sgl) {
1055                 req = blk_get_request(pdv->pdv_sd->request_queue,
1056                                 (data_direction == DMA_TO_DEVICE),
1057                                 GFP_KERNEL);
1058                 if (!req || IS_ERR(req)) {
1059                         pr_err("PSCSI: blk_get_request() failed: %ld\n",
1060                                         req ? IS_ERR(req) : -ENOMEM);
1061                         cmd->scsi_sense_reason =
1062                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1063                         goto fail;
1064                 }
1065         } else {
1066                 BUG_ON(!cmd->data_length);
1067
1068                 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1069                 if (ret < 0) {
1070                         cmd->scsi_sense_reason =
1071                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1072                         goto fail;
1073                 }
1074
1075                 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1076                                        GFP_KERNEL);
1077                 if (IS_ERR(req)) {
1078                         pr_err("pSCSI: blk_make_request() failed\n");
1079                         goto fail_free_bio;
1080                 }
1081         }
1082
1083         req->cmd_type = REQ_TYPE_BLOCK_PC;
1084         req->end_io = pscsi_req_done;
1085         req->end_io_data = cmd;
1086         req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1087         req->cmd = &pt->pscsi_cdb[0];
1088         req->sense = &pt->pscsi_sense[0];
1089         req->sense_len = 0;
1090         if (pdv->pdv_sd->type == TYPE_DISK)
1091                 req->timeout = PS_TIMEOUT_DISK;
1092         else
1093                 req->timeout = PS_TIMEOUT_OTHER;
1094         req->retries = PS_RETRY;
1095
1096         blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1097                         (cmd->sam_task_attr == MSG_HEAD_TAG),
1098                         pscsi_req_done);
1099
1100         return 0;
1101
1102 fail_free_bio:
1103         while (hbio) {
1104                 struct bio *bio = hbio;
1105                 hbio = hbio->bi_next;
1106                 bio->bi_next = NULL;
1107                 bio_endio(bio, 0);      /* XXX: should be error */
1108         }
1109         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1110 fail:
1111         kfree(pt);
1112         return -ENOMEM;
1113 }
1114
1115 /*      pscsi_get_device_rev():
1116  *
1117  *
1118  */
1119 static u32 pscsi_get_device_rev(struct se_device *dev)
1120 {
1121         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1122         struct scsi_device *sd = pdv->pdv_sd;
1123
1124         return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1125 }
1126
1127 /*      pscsi_get_device_type():
1128  *
1129  *
1130  */
1131 static u32 pscsi_get_device_type(struct se_device *dev)
1132 {
1133         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1134         struct scsi_device *sd = pdv->pdv_sd;
1135
1136         return sd->type;
1137 }
1138
1139 static sector_t pscsi_get_blocks(struct se_device *dev)
1140 {
1141         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1142
1143         if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1144                 return pdv->pdv_bd->bd_part->nr_sects;
1145
1146         dump_stack();
1147         return 0;
1148 }
1149
1150 static void pscsi_req_done(struct request *req, int uptodate)
1151 {
1152         struct se_cmd *cmd = req->end_io_data;
1153         struct pscsi_plugin_task *pt = cmd->priv;
1154
1155         pt->pscsi_result = req->errors;
1156         pt->pscsi_resid = req->resid_len;
1157
1158         cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1159         if (cmd->scsi_status) {
1160                 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1161                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1162                         pt->pscsi_result);
1163         }
1164
1165         switch (host_byte(pt->pscsi_result)) {
1166         case DID_OK:
1167                 target_complete_cmd(cmd, cmd->scsi_status);
1168                 break;
1169         default:
1170                 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1171                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1172                         pt->pscsi_result);
1173                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1174                 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1175                 break;
1176         }
1177
1178         __blk_put_request(req->q, req);
1179         kfree(pt);
1180 }
1181
1182 static struct se_subsystem_api pscsi_template = {
1183         .name                   = "pscsi",
1184         .owner                  = THIS_MODULE,
1185         .transport_type         = TRANSPORT_PLUGIN_PHBA_PDEV,
1186         .attach_hba             = pscsi_attach_hba,
1187         .detach_hba             = pscsi_detach_hba,
1188         .pmode_enable_hba       = pscsi_pmode_enable_hba,
1189         .alloc_device           = pscsi_alloc_device,
1190         .configure_device       = pscsi_configure_device,
1191         .free_device            = pscsi_free_device,
1192         .transport_complete     = pscsi_transport_complete,
1193         .parse_cdb              = pscsi_parse_cdb,
1194         .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1195         .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1196         .get_device_rev         = pscsi_get_device_rev,
1197         .get_device_type        = pscsi_get_device_type,
1198         .get_blocks             = pscsi_get_blocks,
1199 };
1200
1201 static int __init pscsi_module_init(void)
1202 {
1203         return transport_subsystem_register(&pscsi_template);
1204 }
1205
1206 static void pscsi_module_exit(void)
1207 {
1208         transport_subsystem_release(&pscsi_template);
1209 }
1210
1211 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1212 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1213 MODULE_LICENSE("GPL");
1214
1215 module_init(pscsi_module_init);
1216 module_exit(pscsi_module_exit);