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  * (c) Copyright 2003-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  ******************************************************************************/
  25
  26 #include <linux/string.h>
  27 #include <linux/parser.h>
  28 #include <linux/timer.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/blk_types.h>
  31 #include <linux/slab.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/genhd.h>
  34 #include <linux/cdrom.h>
  35 #include <linux/ratelimit.h>
  36 #include <linux/module.h>
  37 #include <asm/unaligned.h>
  38
  39 #include <scsi/scsi.h>
  40 #include <scsi/scsi_device.h>
  41 #include <scsi/scsi_cmnd.h>
  42 #include <scsi/scsi_host.h>
  43 #include <scsi/scsi_tcq.h>
  44
  45 #include <target/target_core_base.h>
  46 #include <target/target_core_backend.h>
  47 #include <target/target_core_backend_configfs.h>
  48
  49 #include "target_core_alua.h"
  50 #include "target_core_pscsi.h"
  51
  52 #define ISPRINT(a)  ((a >= ' ') && (a <= '~'))
  53
  54 static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
  55 {
  56         return container_of(dev, struct pscsi_dev_virt, dev);
  57 }
  58
  59 static struct se_subsystem_api pscsi_template;
  60
  61 static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
  62 static void pscsi_req_done(struct request *, int);
  63
  64 /*      pscsi_attach_hba():
  65  *
  66  *      pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
  67  *      from the passed SCSI Host ID.
  68  */
  69 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
  70 {
  71         struct pscsi_hba_virt *phv;
  72
  73         phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
  74         if (!phv) {
  75                 pr_err("Unable to allocate struct pscsi_hba_virt\n");
  76                 return -ENOMEM;
  77         }
  78         phv->phv_host_id = host_id;
  79         phv->phv_mode = PHV_VIRTUAL_HOST_ID;
  80
  81         hba->hba_ptr = phv;
  82
  83         pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
  84                 " Generic Target Core Stack %s\n", hba->hba_id,
  85                 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
  86         pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
  87                hba->hba_id);
  88
  89         return 0;
  90 }
  91
  92 static void pscsi_detach_hba(struct se_hba *hba)
  93 {
  94         struct pscsi_hba_virt *phv = hba->hba_ptr;
  95         struct Scsi_Host *scsi_host = phv->phv_lld_host;
  96
  97         if (scsi_host) {
  98                 scsi_host_put(scsi_host);
  99
 100                 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
 101                         " Generic Target Core\n", hba->hba_id,
 102                         (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
 103                         "Unknown");
 104         } else
 105                 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
 106                         " from Generic Target Core\n", hba->hba_id);
 107
 108         kfree(phv);
 109         hba->hba_ptr = NULL;
 110 }
 111
 112 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
 113 {
 114         struct pscsi_hba_virt *phv = hba->hba_ptr;
 115         struct Scsi_Host *sh = phv->phv_lld_host;
 116         /*
 117          * Release the struct Scsi_Host
 118          */
 119         if (!mode_flag) {
 120                 if (!sh)
 121                         return 0;
 122
 123                 phv->phv_lld_host = NULL;
 124                 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
 125
 126                 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
 127                         " %s\n", hba->hba_id, (sh->hostt->name) ?
 128                         (sh->hostt->name) : "Unknown");
 129
 130                 scsi_host_put(sh);
 131                 return 0;
 132         }
 133         /*
 134          * Otherwise, locate struct Scsi_Host from the original passed
 135          * pSCSI Host ID and enable for phba mode
 136          */
 137         sh = scsi_host_lookup(phv->phv_host_id);
 138         if (!sh) {
 139                 pr_err("pSCSI: Unable to locate SCSI Host for"
 140                         " phv_host_id: %d\n", phv->phv_host_id);
 141                 return -EINVAL;
 142         }
 143
 144         phv->phv_lld_host = sh;
 145         phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
 146
 147         pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
 148                 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
 149
 150         return 1;
 151 }
 152
 153 static void pscsi_tape_read_blocksize(struct se_device *dev,
 154                 struct scsi_device *sdev)
 155 {
 156         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 157         int ret;
 158
 159         buf = kzalloc(12, GFP_KERNEL);
 160         if (!buf)
 161                 return;
 162
 163         memset(cdb, 0, MAX_COMMAND_SIZE);
 164         cdb[0] = MODE_SENSE;
 165         cdb[4] = 0x0c; /* 12 bytes */
 166
 167         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
 168                         HZ, 1, NULL);
 169         if (ret)
 170                 goto out_free;
 171
 172         /*
 173          * If MODE_SENSE still returns zero, set the default value to 1024.
 174          */
 175         sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
 176         if (!sdev->sector_size)
 177                 sdev->sector_size = 1024;
 178 out_free:
 179         kfree(buf);
 180 }
 181
 182 static void
 183 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
 184 {
 185         unsigned char *buf;
 186
 187         if (sdev->inquiry_len < INQUIRY_LEN)
 188                 return;
 189
 190         buf = sdev->inquiry;
 191         if (!buf)
 192                 return;
 193         /*
 194          * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
 195          */
 196         memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
 197         memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
 198         memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
 199 }
 200
 201 static int
 202 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
 203 {
 204         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 205         int ret;
 206
 207         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 208         if (!buf)
 209                 return -ENOMEM;
 210
 211         memset(cdb, 0, MAX_COMMAND_SIZE);
 212         cdb[0] = INQUIRY;
 213         cdb[1] = 0x01; /* Query VPD */
 214         cdb[2] = 0x80; /* Unit Serial Number */
 215         cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
 216         cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
 217
 218         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 219                               INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
 220         if (ret)
 221                 goto out_free;
 222
 223         snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
 224
 225         wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL;
 226
 227         kfree(buf);
 228         return 0;
 229
 230 out_free:
 231         kfree(buf);
 232         return -EPERM;
 233 }
 234
 235 static void
 236 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
 237                 struct t10_wwn *wwn)
 238 {
 239         unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
 240         int ident_len, page_len, off = 4, ret;
 241         struct t10_vpd *vpd;
 242
 243         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 244         if (!buf)
 245                 return;
 246
 247         memset(cdb, 0, MAX_COMMAND_SIZE);
 248         cdb[0] = INQUIRY;
 249         cdb[1] = 0x01; /* Query VPD */
 250         cdb[2] = 0x83; /* Device Identifier */
 251         cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
 252         cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
 253
 254         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 255                               INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
 256                               NULL, HZ, 1, NULL);
 257         if (ret)
 258                 goto out;
 259
 260         page_len = (buf[2] << 8) | buf[3];
 261         while (page_len > 0) {
 262                 /* Grab a pointer to the Identification descriptor */
 263                 page_83 = &buf[off];
 264                 ident_len = page_83[3];
 265                 if (!ident_len) {
 266                         pr_err("page_83[3]: identifier"
 267                                         " length zero!\n");
 268                         break;
 269                 }
 270                 pr_debug("T10 VPD Identifier Length: %d\n", ident_len);
 271
 272                 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
 273                 if (!vpd) {
 274                         pr_err("Unable to allocate memory for"
 275                                         " struct t10_vpd\n");
 276                         goto out;
 277                 }
 278                 INIT_LIST_HEAD(&vpd->vpd_list);
 279
 280                 transport_set_vpd_proto_id(vpd, page_83);
 281                 transport_set_vpd_assoc(vpd, page_83);
 282
 283                 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
 284                         off += (ident_len + 4);
 285                         page_len -= (ident_len + 4);
 286                         kfree(vpd);
 287                         continue;
 288                 }
 289                 if (transport_set_vpd_ident(vpd, page_83) < 0) {
 290                         off += (ident_len + 4);
 291                         page_len -= (ident_len + 4);
 292                         kfree(vpd);
 293                         continue;
 294                 }
 295
 296                 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
 297                 off += (ident_len + 4);
 298                 page_len -= (ident_len + 4);
 299         }
 300
 301 out:
 302         kfree(buf);
 303 }
 304
 305 static int pscsi_add_device_to_list(struct se_device *dev,
 306                 struct scsi_device *sd)
 307 {
 308         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 309         struct request_queue *q = sd->request_queue;
 310
 311         pdv->pdv_sd = sd;
 312
 313         if (!sd->queue_depth) {
 314                 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
 315
 316                 pr_err("Set broken SCSI Device %d:%d:%llu"
 317                         " queue_depth to %d\n", sd->channel, sd->id,
 318                                 sd->lun, sd->queue_depth);
 319         }
 320
 321         dev->dev_attrib.hw_block_size = sd->sector_size;
 322         dev->dev_attrib.hw_max_sectors =
 323                 min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
 324         dev->dev_attrib.hw_queue_depth = sd->queue_depth;
 325
 326         /*
 327          * Setup our standard INQUIRY info into se_dev->t10_wwn
 328          */
 329         pscsi_set_inquiry_info(sd, &dev->t10_wwn);
 330
 331         /*
 332          * Locate VPD WWN Information used for various purposes within
 333          * the Storage Engine.
 334          */
 335         if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) {
 336                 /*
 337                  * If VPD Unit Serial returned GOOD status, try
 338                  * VPD Device Identification page (0x83).
 339                  */
 340                 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn);
 341         }
 342
 343         /*
 344          * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
 345          */
 346         if (sd->type == TYPE_TAPE)
 347                 pscsi_tape_read_blocksize(dev, sd);
 348         return 0;
 349 }
 350
 351 static struct se_device *pscsi_alloc_device(struct se_hba *hba,
 352                 const char *name)
 353 {
 354         struct pscsi_dev_virt *pdv;
 355
 356         pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
 357         if (!pdv) {
 358                 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
 359                 return NULL;
 360         }
 361
 362         pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
 363         return &pdv->dev;
 364 }
 365
 366 /*
 367  * Called with struct Scsi_Host->host_lock called.
 368  */
 369 static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
 370         __releases(sh->host_lock)
 371 {
 372         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 373         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 374         struct Scsi_Host *sh = sd->host;
 375         struct block_device *bd;
 376         int ret;
 377
 378         if (scsi_device_get(sd)) {
 379                 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
 380                         sh->host_no, sd->channel, sd->id, sd->lun);
 381                 spin_unlock_irq(sh->host_lock);
 382                 return -EIO;
 383         }
 384         spin_unlock_irq(sh->host_lock);
 385         /*
 386          * Claim exclusive struct block_device access to struct scsi_device
 387          * for TYPE_DISK using supplied udev_path
 388          */
 389         bd = blkdev_get_by_path(dev->udev_path,
 390                                 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
 391         if (IS_ERR(bd)) {
 392                 pr_err("pSCSI: blkdev_get_by_path() failed\n");
 393                 scsi_device_put(sd);
 394                 return PTR_ERR(bd);
 395         }
 396         pdv->pdv_bd = bd;
 397
 398         ret = pscsi_add_device_to_list(dev, sd);
 399         if (ret) {
 400                 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 401                 scsi_device_put(sd);
 402                 return ret;
 403         }
 404
 405         pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%llu\n",
 406                 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
 407         return 0;
 408 }
 409
 410 /*
 411  * Called with struct Scsi_Host->host_lock called.
 412  */
 413 static int pscsi_create_type_rom(struct se_device *dev, struct scsi_device *sd)
 414         __releases(sh->host_lock)
 415 {
 416         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 417         struct Scsi_Host *sh = sd->host;
 418         int ret;
 419
 420         if (scsi_device_get(sd)) {
 421                 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
 422                         sh->host_no, sd->channel, sd->id, sd->lun);
 423                 spin_unlock_irq(sh->host_lock);
 424                 return -EIO;
 425         }
 426         spin_unlock_irq(sh->host_lock);
 427
 428         ret = pscsi_add_device_to_list(dev, sd);
 429         if (ret) {
 430                 scsi_device_put(sd);
 431                 return ret;
 432         }
 433         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
 434                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 435                 sd->channel, sd->id, sd->lun);
 436
 437         return 0;
 438 }
 439
 440 /*
 441  * Called with struct Scsi_Host->host_lock called.
 442  */
 443 static int pscsi_create_type_other(struct se_device *dev,
 444                 struct scsi_device *sd)
 445         __releases(sh->host_lock)
 446 {
 447         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 448         struct Scsi_Host *sh = sd->host;
 449         int ret;
 450
 451         spin_unlock_irq(sh->host_lock);
 452         ret = pscsi_add_device_to_list(dev, sd);
 453         if (ret)
 454                 return ret;
 455
 456         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
 457                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 458                 sd->channel, sd->id, sd->lun);
 459         return 0;
 460 }
 461
 462 static int pscsi_configure_device(struct se_device *dev)
 463 {
 464         struct se_hba *hba = dev->se_hba;
 465         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 466         struct scsi_device *sd;
 467         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 468         struct Scsi_Host *sh = phv->phv_lld_host;
 469         int legacy_mode_enable = 0;
 470         int ret;
 471
 472         if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
 473             !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
 474             !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
 475                 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
 476                         " scsi_lun_id= parameters\n");
 477                 return -EINVAL;
 478         }
 479
 480         /*
 481          * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
 482          * struct Scsi_Host we will need to bring the TCM/pSCSI object online
 483          */
 484         if (!sh) {
 485                 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 486                         pr_err("pSCSI: Unable to locate struct"
 487                                 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
 488                         return -ENODEV;
 489                 }
 490                 /*
 491                  * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
 492                  * reference, we enforce that udev_path has been set
 493                  */
 494                 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
 495                         pr_err("pSCSI: udev_path attribute has not"
 496                                 " been set before ENABLE=1\n");
 497                         return -EINVAL;
 498                 }
 499                 /*
 500                  * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
 501                  * use the original TCM hba ID to reference Linux/SCSI Host No
 502                  * and enable for PHV_LLD_SCSI_HOST_NO mode.
 503                  */
 504                 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
 505                         if (hba->dev_count) {
 506                                 pr_err("pSCSI: Unable to set hba_mode"
 507                                         " with active devices\n");
 508                                 return -EEXIST;
 509                         }
 510
 511                         if (pscsi_pmode_enable_hba(hba, 1) != 1)
 512                                 return -ENODEV;
 513
 514                         legacy_mode_enable = 1;
 515                         hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
 516                         sh = phv->phv_lld_host;
 517                 } else {
 518                         sh = scsi_host_lookup(pdv->pdv_host_id);
 519                         if (!sh) {
 520                                 pr_err("pSCSI: Unable to locate"
 521                                         " pdv_host_id: %d\n", pdv->pdv_host_id);
 522                                 return -EINVAL;
 523                         }
 524                 }
 525         } else {
 526                 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
 527                         pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
 528                                 " struct Scsi_Host exists\n");
 529                         return -EEXIST;
 530                 }
 531         }
 532
 533         spin_lock_irq(sh->host_lock);
 534         list_for_each_entry(sd, &sh->__devices, siblings) {
 535                 if ((pdv->pdv_channel_id != sd->channel) ||
 536                     (pdv->pdv_target_id != sd->id) ||
 537                     (pdv->pdv_lun_id != sd->lun))
 538                         continue;
 539                 /*
 540                  * Functions will release the held struct scsi_host->host_lock
 541                  * before calling calling pscsi_add_device_to_list() to register
 542                  * struct scsi_device with target_core_mod.
 543                  */
 544                 switch (sd->type) {
 545                 case TYPE_DISK:
 546                         ret = pscsi_create_type_disk(dev, sd);
 547                         break;
 548                 case TYPE_ROM:
 549                         ret = pscsi_create_type_rom(dev, sd);
 550                         break;
 551                 default:
 552                         ret = pscsi_create_type_other(dev, sd);
 553                         break;
 554                 }
 555
 556                 if (ret) {
 557                         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 558                                 scsi_host_put(sh);
 559                         else if (legacy_mode_enable) {
 560                                 pscsi_pmode_enable_hba(hba, 0);
 561                                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 562                         }
 563                         pdv->pdv_sd = NULL;
 564                         return ret;
 565                 }
 566                 return 0;
 567         }
 568         spin_unlock_irq(sh->host_lock);
 569
 570         pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
 571                 pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);
 572
 573         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 574                 scsi_host_put(sh);
 575         else if (legacy_mode_enable) {
 576                 pscsi_pmode_enable_hba(hba, 0);
 577                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 578         }
 579
 580         return -ENODEV;
 581 }
 582
 583 static void pscsi_free_device(struct se_device *dev)
 584 {
 585         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 586         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 587         struct scsi_device *sd = pdv->pdv_sd;
 588
 589         if (sd) {
 590                 /*
 591                  * Release exclusive pSCSI internal struct block_device claim for
 592                  * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
 593                  */
 594                 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
 595                         blkdev_put(pdv->pdv_bd,
 596                                    FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 597                         pdv->pdv_bd = NULL;
 598                 }
 599                 /*
 600                  * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
 601                  * to struct Scsi_Host now.
 602                  */
 603                 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
 604                     (phv->phv_lld_host != NULL))
 605                         scsi_host_put(phv->phv_lld_host);
 606
 607                 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
 608                         scsi_device_put(sd);
 609
 610                 pdv->pdv_sd = NULL;
 611         }
 612
 613         kfree(pdv);
 614 }
 615
 616 static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
 617                                      unsigned char *sense_buffer)
 618 {
 619         struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
 620         struct scsi_device *sd = pdv->pdv_sd;
 621         int result;
 622         struct pscsi_plugin_task *pt = cmd->priv;
 623         unsigned char *cdb;
 624         /*
 625          * Special case for REPORT_LUNs handling where pscsi_plugin_task has
 626          * not been allocated because TCM is handling the emulation directly.
 627          */
 628         if (!pt)
 629                 return;
 630
 631         cdb = &pt->pscsi_cdb[0];
 632         result = pt->pscsi_result;
 633         /*
 634          * Hack to make sure that Write-Protect modepage is set if R/O mode is
 635          * forced.
 636          */
 637         if (!cmd->se_deve || !cmd->data_length)
 638                 goto after_mode_sense;
 639
 640         if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
 641              (status_byte(result) << 1) == SAM_STAT_GOOD) {
 642                 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
 643                         unsigned char *buf;
 644
 645                         buf = transport_kmap_data_sg(cmd);
 646                         if (!buf)
 647                                 ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */
 648
 649                         if (cdb[0] == MODE_SENSE_10) {
 650                                 if (!(buf[3] & 0x80))
 651                                         buf[3] |= 0x80;
 652                         } else {
 653                                 if (!(buf[2] & 0x80))
 654                                         buf[2] |= 0x80;
 655                         }
 656
 657                         transport_kunmap_data_sg(cmd);
 658                 }
 659         }
 660 after_mode_sense:
 661
 662         if (sd->type != TYPE_TAPE || !cmd->data_length)
 663                 goto after_mode_select;
 664
 665         /*
 666          * Hack to correctly obtain the initiator requested blocksize for
 667          * TYPE_TAPE.  Since this value is dependent upon each tape media,
 668          * struct scsi_device->sector_size will not contain the correct value
 669          * by default, so we go ahead and set it so
 670          * TRANSPORT(dev)->get_blockdev() returns the correct value to the
 671          * storage engine.
 672          */
 673         if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
 674               (status_byte(result) << 1) == SAM_STAT_GOOD) {
 675                 unsigned char *buf;
 676                 u16 bdl;
 677                 u32 blocksize;
 678
 679                 buf = sg_virt(&sg[0]);
 680                 if (!buf) {
 681                         pr_err("Unable to get buf for scatterlist\n");
 682                         goto after_mode_select;
 683                 }
 684
 685                 if (cdb[0] == MODE_SELECT)
 686                         bdl = (buf[3]);
 687                 else
 688                         bdl = (buf[6] << 8) | (buf[7]);
 689
 690                 if (!bdl)
 691                         goto after_mode_select;
 692
 693                 if (cdb[0] == MODE_SELECT)
 694                         blocksize = (buf[9] << 16) | (buf[10] << 8) |
 695                                         (buf[11]);
 696                 else
 697                         blocksize = (buf[13] << 16) | (buf[14] << 8) |
 698                                         (buf[15]);
 699
 700                 sd->sector_size = blocksize;
 701         }
 702 after_mode_select:
 703
 704         if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
 705                 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
 706                 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 707         }
 708 }
 709
 710 enum {
 711         Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
 712         Opt_scsi_lun_id, Opt_err
 713 };
 714
 715 static match_table_t tokens = {
 716         {Opt_scsi_host_id, "scsi_host_id=%d"},
 717         {Opt_scsi_channel_id, "scsi_channel_id=%d"},
 718         {Opt_scsi_target_id, "scsi_target_id=%d"},
 719         {Opt_scsi_lun_id, "scsi_lun_id=%d"},
 720         {Opt_err, NULL}
 721 };
 722
 723 static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev,
 724                 const char *page, ssize_t count)
 725 {
 726         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 727         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 728         char *orig, *ptr, *opts;
 729         substring_t args[MAX_OPT_ARGS];
 730         int ret = 0, arg, token;
 731
 732         opts = kstrdup(page, GFP_KERNEL);
 733         if (!opts)
 734                 return -ENOMEM;
 735
 736         orig = opts;
 737
 738         while ((ptr = strsep(&opts, ",\n")) != NULL) {
 739                 if (!*ptr)
 740                         continue;
 741
 742                 token = match_token(ptr, tokens, args);
 743                 switch (token) {
 744                 case Opt_scsi_host_id:
 745                         if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 746                                 pr_err("PSCSI[%d]: Unable to accept"
 747                                         " scsi_host_id while phv_mode =="
 748                                         " PHV_LLD_SCSI_HOST_NO\n",
 749                                         phv->phv_host_id);
 750                                 ret = -EINVAL;
 751                                 goto out;
 752                         }
 753                         ret = match_int(args, &arg);
 754                         if (ret)
 755                                 goto out;
 756                         pdv->pdv_host_id = arg;
 757                         pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
 758                                 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
 759                         pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
 760                         break;
 761                 case Opt_scsi_channel_id:
 762                         ret = match_int(args, &arg);
 763                         if (ret)
 764                                 goto out;
 765                         pdv->pdv_channel_id = arg;
 766                         pr_debug("PSCSI[%d]: Referencing SCSI Channel"
 767                                 " ID: %d\n",  phv->phv_host_id,
 768                                 pdv->pdv_channel_id);
 769                         pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
 770                         break;
 771                 case Opt_scsi_target_id:
 772                         ret = match_int(args, &arg);
 773                         if (ret)
 774                                 goto out;
 775                         pdv->pdv_target_id = arg;
 776                         pr_debug("PSCSI[%d]: Referencing SCSI Target"
 777                                 " ID: %d\n", phv->phv_host_id,
 778                                 pdv->pdv_target_id);
 779                         pdv->pdv_flags |= PDF_HAS_TARGET_ID;
 780                         break;
 781                 case Opt_scsi_lun_id:
 782                         ret = match_int(args, &arg);
 783                         if (ret)
 784                                 goto out;
 785                         pdv->pdv_lun_id = arg;
 786                         pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
 787                                 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
 788                         pdv->pdv_flags |= PDF_HAS_LUN_ID;
 789                         break;
 790                 default:
 791                         break;
 792                 }
 793         }
 794
 795 out:
 796         kfree(orig);
 797         return (!ret) ? count : ret;
 798 }
 799
 800 static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
 801 {
 802         struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
 803         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
 804         struct scsi_device *sd = pdv->pdv_sd;
 805         unsigned char host_id[16];
 806         ssize_t bl;
 807         int i;
 808
 809         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 810                 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
 811         else
 812                 snprintf(host_id, 16, "PHBA Mode");
 813
 814         bl = sprintf(b, "SCSI Device Bus Location:"
 815                 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
 816                 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
 817                 host_id);
 818
 819         if (sd) {
 820                 bl += sprintf(b + bl, "        ");
 821                 bl += sprintf(b + bl, "Vendor: ");
 822                 for (i = 0; i < 8; i++) {
 823                         if (ISPRINT(sd->vendor[i]))   /* printable character? */
 824                                 bl += sprintf(b + bl, "%c", sd->vendor[i]);
 825                         else
 826                                 bl += sprintf(b + bl, " ");
 827                 }
 828                 bl += sprintf(b + bl, " Model: ");
 829                 for (i = 0; i < 16; i++) {
 830                         if (ISPRINT(sd->model[i]))   /* printable character ? */
 831                                 bl += sprintf(b + bl, "%c", sd->model[i]);
 832                         else
 833                                 bl += sprintf(b + bl, " ");
 834                 }
 835                 bl += sprintf(b + bl, " Rev: ");
 836                 for (i = 0; i < 4; i++) {
 837                         if (ISPRINT(sd->rev[i]))   /* printable character ? */
 838                                 bl += sprintf(b + bl, "%c", sd->rev[i]);
 839                         else
 840                                 bl += sprintf(b + bl, " ");
 841                 }
 842                 bl += sprintf(b + bl, "\n");
 843         }
 844         return bl;
 845 }
 846
 847 static void pscsi_bi_endio(struct bio *bio, int error)
 848 {
 849         bio_put(bio);
 850 }
 851
 852 static inline struct bio *pscsi_get_bio(int nr_vecs)
 853 {
 854         struct bio *bio;
 855         /*
 856          * Use bio_malloc() following the comment in for bio -> struct request
 857          * in block/blk-core.c:blk_make_request()
 858          */
 859         bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
 860         if (!bio) {
 861                 pr_err("PSCSI: bio_kmalloc() failed\n");
 862                 return NULL;
 863         }
 864         bio->bi_end_io = pscsi_bi_endio;
 865
 866         return bio;
 867 }
 868
 869 static sense_reason_t
 870 pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 871                 enum dma_data_direction data_direction, struct bio **hbio)
 872 {
 873         struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
 874         struct bio *bio = NULL, *tbio = NULL;
 875         struct page *page;
 876         struct scatterlist *sg;
 877         u32 data_len = cmd->data_length, i, len, bytes, off;
 878         int nr_pages = (cmd->data_length + sgl[0].offset +
 879                         PAGE_SIZE - 1) >> PAGE_SHIFT;
 880         int nr_vecs = 0, rc;
 881         int rw = (data_direction == DMA_TO_DEVICE);
 882
 883         *hbio = NULL;
 884
 885         pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
 886
 887         for_each_sg(sgl, sg, sgl_nents, i) {
 888                 page = sg_page(sg);
 889                 off = sg->offset;
 890                 len = sg->length;
 891
 892                 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
 893                         page, len, off);
 894
 895                 /*
 896                  * We only have one page of data in each sg element,
 897                  * we can not cross a page boundary.
 898                  */
 899                 if (off + len > PAGE_SIZE)
 900                         goto fail;
 901
 902                 if (len > 0 && data_len > 0) {
 903                         bytes = min_t(unsigned int, len, PAGE_SIZE - off);
 904                         bytes = min(bytes, data_len);
 905
 906                         if (!bio) {
 907                                 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
 908                                 nr_pages -= nr_vecs;
 909                                 /*
 910                                  * Calls bio_kmalloc() and sets bio->bi_end_io()
 911                                  */
 912                                 bio = pscsi_get_bio(nr_vecs);
 913                                 if (!bio)
 914                                         goto fail;
 915
 916                                 if (rw)
 917                                         bio->bi_rw |= REQ_WRITE;
 918
 919                                 pr_debug("PSCSI: Allocated bio: %p,"
 920                                         " dir: %s nr_vecs: %d\n", bio,
 921                                         (rw) ? "rw" : "r", nr_vecs);
 922                                 /*
 923                                  * Set *hbio pointer to handle the case:
 924                                  * nr_pages > BIO_MAX_PAGES, where additional
 925                                  * bios need to be added to complete a given
 926                                  * command.
 927                                  */
 928                                 if (!*hbio)
 929                                         *hbio = tbio = bio;
 930                                 else
 931                                         tbio = tbio->bi_next = bio;
 932                         }
 933
 934                         pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
 935                                 " bio: %p page: %p len: %d off: %d\n", i, bio,
 936                                 page, len, off);
 937
 938                         rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
 939                                         bio, page, bytes, off);
 940                         if (rc != bytes)
 941                                 goto fail;
 942
 943                         pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
 944                                 bio->bi_vcnt, nr_vecs);
 945
 946                         if (bio->bi_vcnt > nr_vecs) {
 947                                 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
 948                                         " %d i: %d bio: %p, allocating another"
 949                                         " bio\n", bio->bi_vcnt, i, bio);
 950                                 /*
 951                                  * Clear the pointer so that another bio will
 952                                  * be allocated with pscsi_get_bio() above, the
 953                                  * current bio has already been set *tbio and
 954                                  * bio->bi_next.
 955                                  */
 956                                 bio = NULL;
 957                         }
 958
 959                         data_len -= bytes;
 960                 }
 961         }
 962
 963         return 0;
 964 fail:
 965         while (*hbio) {
 966                 bio = *hbio;
 967                 *hbio = (*hbio)->bi_next;
 968                 bio_endio(bio, 0);      /* XXX: should be error */
 969         }
 970         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 971 }
 972
 973 /*
 974  * Clear a lun set in the cdb if the initiator talking to use spoke
 975  * and old standards version, as we can't assume the underlying device
 976  * won't choke up on it.
 977  */
 978 static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
 979 {
 980         switch (cdb[0]) {
 981         case READ_10: /* SBC - RDProtect */
 982         case READ_12: /* SBC - RDProtect */
 983         case READ_16: /* SBC - RDProtect */
 984         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
 985         case VERIFY: /* SBC - VRProtect */
 986         case VERIFY_16: /* SBC - VRProtect */
 987         case WRITE_VERIFY: /* SBC - VRProtect */
 988         case WRITE_VERIFY_12: /* SBC - VRProtect */
 989         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
 990                 break;
 991         default:
 992                 cdb[1] &= 0x1f; /* clear logical unit number */
 993                 break;
 994         }
 995 }
 996
 997 static sense_reason_t
 998 pscsi_parse_cdb(struct se_cmd *cmd)
 999 {
1000         unsigned char *cdb = cmd->t_task_cdb;
1001
1002         if (cmd->se_cmd_flags & SCF_BIDI)
1003                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1004
1005         pscsi_clear_cdb_lun(cdb);
1006
1007         /*
1008          * For REPORT LUNS we always need to emulate the response, for everything
1009          * else the default for pSCSI is to pass the command to the underlying
1010          * LLD / physical hardware.
1011          */
1012         switch (cdb[0]) {
1013         case REPORT_LUNS:
1014                 cmd->execute_cmd = spc_emulate_report_luns;
1015                 return 0;
1016         case READ_6:
1017         case READ_10:
1018         case READ_12:
1019         case READ_16:
1020         case WRITE_6:
1021         case WRITE_10:
1022         case WRITE_12:
1023         case WRITE_16:
1024         case WRITE_VERIFY:
1025                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1026                 /* FALLTHROUGH*/
1027         default:
1028                 cmd->execute_cmd = pscsi_execute_cmd;
1029                 return 0;
1030         }
1031 }
1032
1033 static sense_reason_t
1034 pscsi_execute_cmd(struct se_cmd *cmd)
1035 {
1036         struct scatterlist *sgl = cmd->t_data_sg;
1037         u32 sgl_nents = cmd->t_data_nents;
1038         enum dma_data_direction data_direction = cmd->data_direction;
1039         struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
1040         struct pscsi_plugin_task *pt;
1041         struct request *req;
1042         struct bio *hbio;
1043         sense_reason_t ret;
1044
1045         /*
1046          * Dynamically alloc cdb space, since it may be larger than
1047          * TCM_MAX_COMMAND_SIZE
1048          */
1049         pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1050         if (!pt) {
1051                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1052         }
1053         cmd->priv = pt;
1054
1055         memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1056                 scsi_command_size(cmd->t_task_cdb));
1057
1058         if (!sgl) {
1059                 req = blk_get_request(pdv->pdv_sd->request_queue,
1060                                 (data_direction == DMA_TO_DEVICE),
1061                                 GFP_KERNEL);
1062                 if (IS_ERR(req)) {
1063                         pr_err("PSCSI: blk_get_request() failed\n");
1064                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1065                         goto fail;
1066                 }
1067
1068                 blk_rq_set_block_pc(req);
1069         } else {
1070                 BUG_ON(!cmd->data_length);
1071
1072                 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1073                 if (ret)
1074                         goto fail;
1075
1076                 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1077                                        GFP_KERNEL);
1078                 if (IS_ERR(req)) {
1079                         pr_err("pSCSI: blk_make_request() failed\n");
1080                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1081                         goto fail_free_bio;
1082                 }
1083         }
1084
1085         req->end_io = pscsi_req_done;
1086         req->end_io_data = cmd;
1087         req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1088         req->cmd = &pt->pscsi_cdb[0];
1089         req->sense = &pt->pscsi_sense[0];
1090         req->sense_len = 0;
1091         if (pdv->pdv_sd->type == TYPE_DISK)
1092                 req->timeout = PS_TIMEOUT_DISK;
1093         else
1094                 req->timeout = PS_TIMEOUT_OTHER;
1095         req->retries = PS_RETRY;
1096
1097         blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1098                         (cmd->sam_task_attr == TCM_HEAD_TAG),
1099                         pscsi_req_done);
1100
1101         return 0;
1102
1103 fail_free_bio:
1104         while (hbio) {
1105                 struct bio *bio = hbio;
1106                 hbio = hbio->bi_next;
1107                 bio_endio(bio, 0);      /* XXX: should be error */
1108         }
1109         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1110 fail:
1111         kfree(pt);
1112         return ret;
1113 }
1114
1115 /*      pscsi_get_device_type():
1116  *
1117  *
1118  */
1119 static u32 pscsi_get_device_type(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) ? sd->type : TYPE_NO_LUN;
1125 }
1126
1127 static sector_t pscsi_get_blocks(struct se_device *dev)
1128 {
1129         struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1130
1131         if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1132                 return pdv->pdv_bd->bd_part->nr_sects;
1133
1134         dump_stack();
1135         return 0;
1136 }
1137
1138 static void pscsi_req_done(struct request *req, int uptodate)
1139 {
1140         struct se_cmd *cmd = req->end_io_data;
1141         struct pscsi_plugin_task *pt = cmd->priv;
1142
1143         pt->pscsi_result = req->errors;
1144         pt->pscsi_resid = req->resid_len;
1145
1146         cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1147         if (cmd->scsi_status) {
1148                 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1149                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1150                         pt->pscsi_result);
1151         }
1152
1153         switch (host_byte(pt->pscsi_result)) {
1154         case DID_OK:
1155                 target_complete_cmd(cmd, cmd->scsi_status);
1156                 break;
1157         default:
1158                 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1159                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1160                         pt->pscsi_result);
1161                 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1162                 break;
1163         }
1164
1165         __blk_put_request(req->q, req);
1166         kfree(pt);
1167 }
1168
1169 DEF_TB_DEV_ATTRIB_RO(pscsi, hw_pi_prot_type);
1170 TB_DEV_ATTR_RO(pscsi, hw_pi_prot_type);
1171
1172 DEF_TB_DEV_ATTRIB_RO(pscsi, hw_block_size);
1173 TB_DEV_ATTR_RO(pscsi, hw_block_size);
1174
1175 DEF_TB_DEV_ATTRIB_RO(pscsi, hw_max_sectors);
1176 TB_DEV_ATTR_RO(pscsi, hw_max_sectors);
1177
1178 DEF_TB_DEV_ATTRIB_RO(pscsi, hw_queue_depth);
1179 TB_DEV_ATTR_RO(pscsi, hw_queue_depth);
1180
1181 static struct configfs_attribute *pscsi_backend_dev_attrs[] = {
1182         &pscsi_dev_attrib_hw_pi_prot_type.attr,
1183         &pscsi_dev_attrib_hw_block_size.attr,
1184         &pscsi_dev_attrib_hw_max_sectors.attr,
1185         &pscsi_dev_attrib_hw_queue_depth.attr,
1186         NULL,
1187 };
1188
1189 static struct se_subsystem_api pscsi_template = {
1190         .name                   = "pscsi",
1191         .owner                  = THIS_MODULE,
1192         .transport_type         = TRANSPORT_PLUGIN_PHBA_PDEV,
1193         .attach_hba             = pscsi_attach_hba,
1194         .detach_hba             = pscsi_detach_hba,
1195         .pmode_enable_hba       = pscsi_pmode_enable_hba,
1196         .alloc_device           = pscsi_alloc_device,
1197         .configure_device       = pscsi_configure_device,
1198         .free_device            = pscsi_free_device,
1199         .transport_complete     = pscsi_transport_complete,
1200         .parse_cdb              = pscsi_parse_cdb,
1201         .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1202         .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1203         .get_device_type        = pscsi_get_device_type,
1204         .get_blocks             = pscsi_get_blocks,
1205 };
1206
1207 static int __init pscsi_module_init(void)
1208 {
1209         struct target_backend_cits *tbc = &pscsi_template.tb_cits;
1210
1211         target_core_setup_sub_cits(&pscsi_template);
1212         tbc->tb_dev_attrib_cit.ct_attrs = pscsi_backend_dev_attrs;
1213
1214         return transport_subsystem_register(&pscsi_template);
1215 }
1216
1217 static void __exit pscsi_module_exit(void)
1218 {
1219         transport_subsystem_release(&pscsi_template);
1220 }
1221
1222 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1223 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1224 MODULE_LICENSE("GPL");
1225
1226 module_init(pscsi_module_init);
1227 module_exit(pscsi_module_exit);