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 struct se_subsystem_api pscsi_template;
  57
  58 static int pscsi_execute_cmd(struct se_cmd *cmd);
  59 static void pscsi_req_done(struct request *, int);
  60
  61 /*      pscsi_attach_hba():
  62  *
  63  *      pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
  64  *      from the passed SCSI Host ID.
  65  */
  66 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
  67 {
  68         struct pscsi_hba_virt *phv;
  69
  70         phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
  71         if (!phv) {
  72                 pr_err("Unable to allocate struct pscsi_hba_virt\n");
  73                 return -ENOMEM;
  74         }
  75         phv->phv_host_id = host_id;
  76         phv->phv_mode = PHV_VIRTUAL_HOST_ID;
  77
  78         hba->hba_ptr = phv;
  79
  80         pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
  81                 " Generic Target Core Stack %s\n", hba->hba_id,
  82                 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
  83         pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
  84                hba->hba_id);
  85
  86         return 0;
  87 }
  88
  89 static void pscsi_detach_hba(struct se_hba *hba)
  90 {
  91         struct pscsi_hba_virt *phv = hba->hba_ptr;
  92         struct Scsi_Host *scsi_host = phv->phv_lld_host;
  93
  94         if (scsi_host) {
  95                 scsi_host_put(scsi_host);
  96
  97                 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
  98                         " Generic Target Core\n", hba->hba_id,
  99                         (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
 100                         "Unknown");
 101         } else
 102                 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
 103                         " from Generic Target Core\n", hba->hba_id);
 104
 105         kfree(phv);
 106         hba->hba_ptr = NULL;
 107 }
 108
 109 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
 110 {
 111         struct pscsi_hba_virt *phv = hba->hba_ptr;
 112         struct Scsi_Host *sh = phv->phv_lld_host;
 113         /*
 114          * Release the struct Scsi_Host
 115          */
 116         if (!mode_flag) {
 117                 if (!sh)
 118                         return 0;
 119
 120                 phv->phv_lld_host = NULL;
 121                 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
 122
 123                 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
 124                         " %s\n", hba->hba_id, (sh->hostt->name) ?
 125                         (sh->hostt->name) : "Unknown");
 126
 127                 scsi_host_put(sh);
 128                 return 0;
 129         }
 130         /*
 131          * Otherwise, locate struct Scsi_Host from the original passed
 132          * pSCSI Host ID and enable for phba mode
 133          */
 134         sh = scsi_host_lookup(phv->phv_host_id);
 135         if (IS_ERR(sh)) {
 136                 pr_err("pSCSI: Unable to locate SCSI Host for"
 137                         " phv_host_id: %d\n", phv->phv_host_id);
 138                 return PTR_ERR(sh);
 139         }
 140
 141         phv->phv_lld_host = sh;
 142         phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
 143
 144         pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
 145                 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
 146
 147         return 1;
 148 }
 149
 150 static void pscsi_tape_read_blocksize(struct se_device *dev,
 151                 struct scsi_device *sdev)
 152 {
 153         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 154         int ret;
 155
 156         buf = kzalloc(12, GFP_KERNEL);
 157         if (!buf)
 158                 return;
 159
 160         memset(cdb, 0, MAX_COMMAND_SIZE);
 161         cdb[0] = MODE_SENSE;
 162         cdb[4] = 0x0c; /* 12 bytes */
 163
 164         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
 165                         HZ, 1, NULL);
 166         if (ret)
 167                 goto out_free;
 168
 169         /*
 170          * If MODE_SENSE still returns zero, set the default value to 1024.
 171          */
 172         sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
 173         if (!sdev->sector_size)
 174                 sdev->sector_size = 1024;
 175 out_free:
 176         kfree(buf);
 177 }
 178
 179 static void
 180 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
 181 {
 182         unsigned char *buf;
 183
 184         if (sdev->inquiry_len < INQUIRY_LEN)
 185                 return;
 186
 187         buf = sdev->inquiry;
 188         if (!buf)
 189                 return;
 190         /*
 191          * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
 192          */
 193         memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
 194         memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
 195         memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
 196 }
 197
 198 static int
 199 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
 200 {
 201         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 202         int ret;
 203
 204         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 205         if (!buf)
 206                 return -ENOMEM;
 207
 208         memset(cdb, 0, MAX_COMMAND_SIZE);
 209         cdb[0] = INQUIRY;
 210         cdb[1] = 0x01; /* Query VPD */
 211         cdb[2] = 0x80; /* Unit Serial Number */
 212         cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
 213         cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
 214
 215         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 216                               INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
 217         if (ret)
 218                 goto out_free;
 219
 220         snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
 221
 222         wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
 223
 224         kfree(buf);
 225         return 0;
 226
 227 out_free:
 228         kfree(buf);
 229         return -EPERM;
 230 }
 231
 232 static void
 233 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
 234                 struct t10_wwn *wwn)
 235 {
 236         unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
 237         int ident_len, page_len, off = 4, ret;
 238         struct t10_vpd *vpd;
 239
 240         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 241         if (!buf)
 242                 return;
 243
 244         memset(cdb, 0, MAX_COMMAND_SIZE);
 245         cdb[0] = INQUIRY;
 246         cdb[1] = 0x01; /* Query VPD */
 247         cdb[2] = 0x83; /* Device Identifier */
 248         cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
 249         cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
 250
 251         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 252                               INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
 253                               NULL, HZ, 1, NULL);
 254         if (ret)
 255                 goto out;
 256
 257         page_len = (buf[2] << 8) | buf[3];
 258         while (page_len > 0) {
 259                 /* Grab a pointer to the Identification descriptor */
 260                 page_83 = &buf[off];
 261                 ident_len = page_83[3];
 262                 if (!ident_len) {
 263                         pr_err("page_83[3]: identifier"
 264                                         " length zero!\n");
 265                         break;
 266                 }
 267                 pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
 268
 269                 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
 270                 if (!vpd) {
 271                         pr_err("Unable to allocate memory for"
 272                                         " struct t10_vpd\n");
 273                         goto out;
 274                 }
 275                 INIT_LIST_HEAD(&vpd->vpd_list);
 276
 277                 transport_set_vpd_proto_id(vpd, page_83);
 278                 transport_set_vpd_assoc(vpd, page_83);
 279
 280                 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
 281                         off += (ident_len + 4);
 282                         page_len -= (ident_len + 4);
 283                         kfree(vpd);
 284                         continue;
 285                 }
 286                 if (transport_set_vpd_ident(vpd, page_83) < 0) {
 287                         off += (ident_len + 4);
 288                         page_len -= (ident_len + 4);
 289                         kfree(vpd);
 290                         continue;
 291                 }
 292
 293                 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
 294                 off += (ident_len + 4);
 295                 page_len -= (ident_len + 4);
 296         }
 297
 298 out:
 299         kfree(buf);
 300 }
 301
 302 /*      pscsi_add_device_to_list():
 303  *
 304  *
 305  */
 306 static struct se_device *pscsi_add_device_to_list(
 307         struct se_hba *hba,
 308         struct se_subsystem_dev *se_dev,
 309         struct pscsi_dev_virt *pdv,
 310         struct scsi_device *sd,
 311         int dev_flags)
 312 {
 313         struct se_device *dev;
 314         struct se_dev_limits dev_limits;
 315         struct request_queue *q;
 316         struct queue_limits *limits;
 317
 318         memset(&dev_limits, 0, sizeof(struct se_dev_limits));
 319
 320         if (!sd->queue_depth) {
 321                 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
 322
 323                 pr_err("Set broken SCSI Device %d:%d:%d"
 324                         " queue_depth to %d\n", sd->channel, sd->id,
 325                                 sd->lun, sd->queue_depth);
 326         }
 327         /*
 328          * Setup the local scope queue_limits from struct request_queue->limits
 329          * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
 330          */
 331         q = sd->request_queue;
 332         limits = &dev_limits.limits;
 333         limits->logical_block_size = sd->sector_size;
 334         limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
 335         limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
 336         dev_limits.hw_queue_depth = sd->queue_depth;
 337         dev_limits.queue_depth = sd->queue_depth;
 338         /*
 339          * Setup our standard INQUIRY info into se_dev->t10_wwn
 340          */
 341         pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
 342
 343         /*
 344          * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
 345          * which has already been referenced with Linux SCSI code with
 346          * scsi_device_get() in this file's pscsi_create_virtdevice().
 347          *
 348          * The passthrough operations called by the transport_add_device_*
 349          * function below will require this pointer to be set for passthroug
 350          *  ops.
 351          *
 352          * For the shutdown case in pscsi_free_device(), this struct
 353          * scsi_device  reference is released with Linux SCSI code
 354          * scsi_device_put() and the pdv->pdv_sd cleared.
 355          */
 356         pdv->pdv_sd = sd;
 357         dev = transport_add_device_to_core_hba(hba, &pscsi_template,
 358                                 se_dev, dev_flags, pdv,
 359                                 &dev_limits, NULL, NULL);
 360         if (!dev) {
 361                 pdv->pdv_sd = NULL;
 362                 return NULL;
 363         }
 364
 365         /*
 366          * Locate VPD WWN Information used for various purposes within
 367          * the Storage Engine.
 368          */
 369         if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
 370                 /*
 371                  * If VPD Unit Serial returned GOOD status, try
 372                  * VPD Device Identification page (0x83).
 373                  */
 374                 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
 375         }
 376
 377         /*
 378          * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
 379          */
 380         if (sd->type == TYPE_TAPE)
 381                 pscsi_tape_read_blocksize(dev, sd);
 382         return dev;
 383 }
 384
 385 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
 386 {
 387         struct pscsi_dev_virt *pdv;
 388
 389         pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
 390         if (!pdv) {
 391                 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
 392                 return NULL;
 393         }
 394         pdv->pdv_se_hba = hba;
 395
 396         pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
 397         return pdv;
 398 }
 399
 400 /*
 401  * Called with struct Scsi_Host->host_lock called.
 402  */
 403 static struct se_device *pscsi_create_type_disk(
 404         struct scsi_device *sd,
 405         struct pscsi_dev_virt *pdv,
 406         struct se_subsystem_dev *se_dev,
 407         struct se_hba *hba)
 408         __releases(sh->host_lock)
 409 {
 410         struct se_device *dev;
 411         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 412         struct Scsi_Host *sh = sd->host;
 413         struct block_device *bd;
 414         u32 dev_flags = 0;
 415
 416         if (scsi_device_get(sd)) {
 417                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 418                         sh->host_no, sd->channel, sd->id, sd->lun);
 419                 spin_unlock_irq(sh->host_lock);
 420                 return NULL;
 421         }
 422         spin_unlock_irq(sh->host_lock);
 423         /*
 424          * Claim exclusive struct block_device access to struct scsi_device
 425          * for TYPE_DISK using supplied udev_path
 426          */
 427         bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
 428                                 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
 429         if (IS_ERR(bd)) {
 430                 pr_err("pSCSI: blkdev_get_by_path() failed\n");
 431                 scsi_device_put(sd);
 432                 return NULL;
 433         }
 434         pdv->pdv_bd = bd;
 435
 436         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 437         if (!dev) {
 438                 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 439                 scsi_device_put(sd);
 440                 return NULL;
 441         }
 442         pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
 443                 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
 444
 445         return dev;
 446 }
 447
 448 /*
 449  * Called with struct Scsi_Host->host_lock called.
 450  */
 451 static struct se_device *pscsi_create_type_rom(
 452         struct scsi_device *sd,
 453         struct pscsi_dev_virt *pdv,
 454         struct se_subsystem_dev *se_dev,
 455         struct se_hba *hba)
 456         __releases(sh->host_lock)
 457 {
 458         struct se_device *dev;
 459         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 460         struct Scsi_Host *sh = sd->host;
 461         u32 dev_flags = 0;
 462
 463         if (scsi_device_get(sd)) {
 464                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 465                         sh->host_no, sd->channel, sd->id, sd->lun);
 466                 spin_unlock_irq(sh->host_lock);
 467                 return NULL;
 468         }
 469         spin_unlock_irq(sh->host_lock);
 470
 471         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 472         if (!dev) {
 473                 scsi_device_put(sd);
 474                 return NULL;
 475         }
 476         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 477                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 478                 sd->channel, sd->id, sd->lun);
 479
 480         return dev;
 481 }
 482
 483 /*
 484  *Called with struct Scsi_Host->host_lock called.
 485  */
 486 static struct se_device *pscsi_create_type_other(
 487         struct scsi_device *sd,
 488         struct pscsi_dev_virt *pdv,
 489         struct se_subsystem_dev *se_dev,
 490         struct se_hba *hba)
 491         __releases(sh->host_lock)
 492 {
 493         struct se_device *dev;
 494         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 495         struct Scsi_Host *sh = sd->host;
 496         u32 dev_flags = 0;
 497
 498         spin_unlock_irq(sh->host_lock);
 499         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 500         if (!dev)
 501                 return NULL;
 502
 503         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 504                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 505                 sd->channel, sd->id, sd->lun);
 506
 507         return dev;
 508 }
 509
 510 static struct se_device *pscsi_create_virtdevice(
 511         struct se_hba *hba,
 512         struct se_subsystem_dev *se_dev,
 513         void *p)
 514 {
 515         struct pscsi_dev_virt *pdv = p;
 516         struct se_device *dev;
 517         struct scsi_device *sd;
 518         struct pscsi_hba_virt *phv = hba->hba_ptr;
 519         struct Scsi_Host *sh = phv->phv_lld_host;
 520         int legacy_mode_enable = 0;
 521
 522         if (!pdv) {
 523                 pr_err("Unable to locate struct pscsi_dev_virt"
 524                                 " parameter\n");
 525                 return ERR_PTR(-EINVAL);
 526         }
 527         /*
 528          * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
 529          * struct Scsi_Host we will need to bring the TCM/pSCSI object online
 530          */
 531         if (!sh) {
 532                 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 533                         pr_err("pSCSI: Unable to locate struct"
 534                                 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
 535                         return ERR_PTR(-ENODEV);
 536                 }
 537                 /*
 538                  * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
 539                  * reference, we enforce that udev_path has been set
 540                  */
 541                 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
 542                         pr_err("pSCSI: udev_path attribute has not"
 543                                 " been set before ENABLE=1\n");
 544                         return ERR_PTR(-EINVAL);
 545                 }
 546                 /*
 547                  * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
 548                  * use the original TCM hba ID to reference Linux/SCSI Host No
 549                  * and enable for PHV_LLD_SCSI_HOST_NO mode.
 550                  */
 551                 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
 552                         spin_lock(&hba->device_lock);
 553                         if (!list_empty(&hba->hba_dev_list)) {
 554                                 pr_err("pSCSI: Unable to set hba_mode"
 555                                         " with active devices\n");
 556                                 spin_unlock(&hba->device_lock);
 557                                 return ERR_PTR(-EEXIST);
 558                         }
 559                         spin_unlock(&hba->device_lock);
 560
 561                         if (pscsi_pmode_enable_hba(hba, 1) != 1)
 562                                 return ERR_PTR(-ENODEV);
 563
 564                         legacy_mode_enable = 1;
 565                         hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
 566                         sh = phv->phv_lld_host;
 567                 } else {
 568                         sh = scsi_host_lookup(pdv->pdv_host_id);
 569                         if (IS_ERR(sh)) {
 570                                 pr_err("pSCSI: Unable to locate"
 571                                         " pdv_host_id: %d\n", pdv->pdv_host_id);
 572                                 return ERR_CAST(sh);
 573                         }
 574                 }
 575         } else {
 576                 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
 577                         pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
 578                                 " struct Scsi_Host exists\n");
 579                         return ERR_PTR(-EEXIST);
 580                 }
 581         }
 582
 583         spin_lock_irq(sh->host_lock);
 584         list_for_each_entry(sd, &sh->__devices, siblings) {
 585                 if ((pdv->pdv_channel_id != sd->channel) ||
 586                     (pdv->pdv_target_id != sd->id) ||
 587                     (pdv->pdv_lun_id != sd->lun))
 588                         continue;
 589                 /*
 590                  * Functions will release the held struct scsi_host->host_lock
 591                  * before calling calling pscsi_add_device_to_list() to register
 592                  * struct scsi_device with target_core_mod.
 593                  */
 594                 switch (sd->type) {
 595                 case TYPE_DISK:
 596                         dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
 597                         break;
 598                 case TYPE_ROM:
 599                         dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
 600                         break;
 601                 default:
 602                         dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
 603                         break;
 604                 }
 605
 606                 if (!dev) {
 607                         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 608                                 scsi_host_put(sh);
 609                         else if (legacy_mode_enable) {
 610                                 pscsi_pmode_enable_hba(hba, 0);
 611                                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 612                         }
 613                         pdv->pdv_sd = NULL;
 614                         return ERR_PTR(-ENODEV);
 615                 }
 616                 return dev;
 617         }
 618         spin_unlock_irq(sh->host_lock);
 619
 620         pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
 621                 pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);
 622
 623         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 624                 scsi_host_put(sh);
 625         else if (legacy_mode_enable) {
 626                 pscsi_pmode_enable_hba(hba, 0);
 627                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 628         }
 629
 630         return ERR_PTR(-ENODEV);
 631 }
 632
 633 /*      pscsi_free_device(): (Part of se_subsystem_api_t template)
 634  *
 635  *
 636  */
 637 static void pscsi_free_device(void *p)
 638 {
 639         struct pscsi_dev_virt *pdv = p;
 640         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 641         struct scsi_device *sd = pdv->pdv_sd;
 642
 643         if (sd) {
 644                 /*
 645                  * Release exclusive pSCSI internal struct block_device claim for
 646                  * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
 647                  */
 648                 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
 649                         blkdev_put(pdv->pdv_bd,
 650                                    FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 651                         pdv->pdv_bd = NULL;
 652                 }
 653                 /*
 654                  * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
 655                  * to struct Scsi_Host now.
 656                  */
 657                 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
 658                     (phv->phv_lld_host != NULL))
 659                         scsi_host_put(phv->phv_lld_host);
 660
 661                 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
 662                         scsi_device_put(sd);
 663
 664                 pdv->pdv_sd = NULL;
 665         }
 666
 667         kfree(pdv);
 668 }
 669
 670 static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
 671                                      unsigned char *sense_buffer)
 672 {
 673         struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
 674         struct scsi_device *sd = pdv->pdv_sd;
 675         int result;
 676         struct pscsi_plugin_task *pt = cmd->priv;
 677         unsigned char *cdb;
 678         /*
 679          * Special case for REPORT_LUNs handling where pscsi_plugin_task has
 680          * not been allocated because TCM is handling the emulation directly.
 681          */
 682         if (!pt)
 683                 return;
 684
 685         cdb = &pt->pscsi_cdb[0];
 686         result = pt->pscsi_result;
 687         /*
 688          * Hack to make sure that Write-Protect modepage is set if R/O mode is
 689          * forced.
 690          */
 691         if (!cmd->se_deve || !cmd->data_length)
 692                 goto after_mode_sense;
 693
 694         if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
 695              (status_byte(result) << 1) == SAM_STAT_GOOD) {
 696                 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
 697                         unsigned char *buf = transport_kmap_data_sg(cmd);
 698
 699                         if (cdb[0] == MODE_SENSE_10) {
 700                                 if (!(buf[3] & 0x80))
 701                                         buf[3] |= 0x80;
 702                         } else {
 703                                 if (!(buf[2] & 0x80))
 704                                         buf[2] |= 0x80;
 705                         }
 706
 707                         transport_kunmap_data_sg(cmd);
 708                 }
 709         }
 710 after_mode_sense:
 711
 712         if (sd->type != TYPE_TAPE || !cmd->data_length)
 713                 goto after_mode_select;
 714
 715         /*
 716          * Hack to correctly obtain the initiator requested blocksize for
 717          * TYPE_TAPE.  Since this value is dependent upon each tape media,
 718          * struct scsi_device->sector_size will not contain the correct value
 719          * by default, so we go ahead and set it so
 720          * TRANSPORT(dev)->get_blockdev() returns the correct value to the
 721          * storage engine.
 722          */
 723         if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
 724               (status_byte(result) << 1) == SAM_STAT_GOOD) {
 725                 unsigned char *buf;
 726                 u16 bdl;
 727                 u32 blocksize;
 728
 729                 buf = sg_virt(&sg[0]);
 730                 if (!buf) {
 731                         pr_err("Unable to get buf for scatterlist\n");
 732                         goto after_mode_select;
 733                 }
 734
 735                 if (cdb[0] == MODE_SELECT)
 736                         bdl = (buf[3]);
 737                 else
 738                         bdl = (buf[6] << 8) | (buf[7]);
 739
 740                 if (!bdl)
 741                         goto after_mode_select;
 742
 743                 if (cdb[0] == MODE_SELECT)
 744                         blocksize = (buf[9] << 16) | (buf[10] << 8) |
 745                                         (buf[11]);
 746                 else
 747                         blocksize = (buf[13] << 16) | (buf[14] << 8) |
 748                                         (buf[15]);
 749
 750                 sd->sector_size = blocksize;
 751         }
 752 after_mode_select:
 753
 754         if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
 755                 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
 756                 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 757         }
 758 }
 759
 760 enum {
 761         Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
 762         Opt_scsi_lun_id, Opt_err
 763 };
 764
 765 static match_table_t tokens = {
 766         {Opt_scsi_host_id, "scsi_host_id=%d"},
 767         {Opt_scsi_channel_id, "scsi_channel_id=%d"},
 768         {Opt_scsi_target_id, "scsi_target_id=%d"},
 769         {Opt_scsi_lun_id, "scsi_lun_id=%d"},
 770         {Opt_err, NULL}
 771 };
 772
 773 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
 774         struct se_subsystem_dev *se_dev,
 775         const char *page,
 776         ssize_t count)
 777 {
 778         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 779         struct pscsi_hba_virt *phv = hba->hba_ptr;
 780         char *orig, *ptr, *opts;
 781         substring_t args[MAX_OPT_ARGS];
 782         int ret = 0, arg, token;
 783
 784         opts = kstrdup(page, GFP_KERNEL);
 785         if (!opts)
 786                 return -ENOMEM;
 787
 788         orig = opts;
 789
 790         while ((ptr = strsep(&opts, ",\n")) != NULL) {
 791                 if (!*ptr)
 792                         continue;
 793
 794                 token = match_token(ptr, tokens, args);
 795                 switch (token) {
 796                 case Opt_scsi_host_id:
 797                         if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 798                                 pr_err("PSCSI[%d]: Unable to accept"
 799                                         " scsi_host_id while phv_mode =="
 800                                         " PHV_LLD_SCSI_HOST_NO\n",
 801                                         phv->phv_host_id);
 802                                 ret = -EINVAL;
 803                                 goto out;
 804                         }
 805                         match_int(args, &arg);
 806                         pdv->pdv_host_id = arg;
 807                         pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
 808                                 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
 809                         pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
 810                         break;
 811                 case Opt_scsi_channel_id:
 812                         match_int(args, &arg);
 813                         pdv->pdv_channel_id = arg;
 814                         pr_debug("PSCSI[%d]: Referencing SCSI Channel"
 815                                 " ID: %d\n",  phv->phv_host_id,
 816                                 pdv->pdv_channel_id);
 817                         pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
 818                         break;
 819                 case Opt_scsi_target_id:
 820                         match_int(args, &arg);
 821                         pdv->pdv_target_id = arg;
 822                         pr_debug("PSCSI[%d]: Referencing SCSI Target"
 823                                 " ID: %d\n", phv->phv_host_id,
 824                                 pdv->pdv_target_id);
 825                         pdv->pdv_flags |= PDF_HAS_TARGET_ID;
 826                         break;
 827                 case Opt_scsi_lun_id:
 828                         match_int(args, &arg);
 829                         pdv->pdv_lun_id = arg;
 830                         pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
 831                                 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
 832                         pdv->pdv_flags |= PDF_HAS_LUN_ID;
 833                         break;
 834                 default:
 835                         break;
 836                 }
 837         }
 838
 839 out:
 840         kfree(orig);
 841         return (!ret) ? count : ret;
 842 }
 843
 844 static ssize_t pscsi_check_configfs_dev_params(
 845         struct se_hba *hba,
 846         struct se_subsystem_dev *se_dev)
 847 {
 848         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 849
 850         if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
 851             !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
 852             !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
 853                 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
 854                         " scsi_lun_id= parameters\n");
 855                 return -EINVAL;
 856         }
 857
 858         return 0;
 859 }
 860
 861 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
 862                                               struct se_subsystem_dev *se_dev,
 863                                               char *b)
 864 {
 865         struct pscsi_hba_virt *phv = hba->hba_ptr;
 866         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 867         struct scsi_device *sd = pdv->pdv_sd;
 868         unsigned char host_id[16];
 869         ssize_t bl;
 870         int i;
 871
 872         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 873                 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
 874         else
 875                 snprintf(host_id, 16, "PHBA Mode");
 876
 877         bl = sprintf(b, "SCSI Device Bus Location:"
 878                 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
 879                 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
 880                 host_id);
 881
 882         if (sd) {
 883                 bl += sprintf(b + bl, "        ");
 884                 bl += sprintf(b + bl, "Vendor: ");
 885                 for (i = 0; i < 8; i++) {
 886                         if (ISPRINT(sd->vendor[i]))   /* printable character? */
 887                                 bl += sprintf(b + bl, "%c", sd->vendor[i]);
 888                         else
 889                                 bl += sprintf(b + bl, " ");
 890                 }
 891                 bl += sprintf(b + bl, " Model: ");
 892                 for (i = 0; i < 16; i++) {
 893                         if (ISPRINT(sd->model[i]))   /* printable character ? */
 894                                 bl += sprintf(b + bl, "%c", sd->model[i]);
 895                         else
 896                                 bl += sprintf(b + bl, " ");
 897                 }
 898                 bl += sprintf(b + bl, " Rev: ");
 899                 for (i = 0; i < 4; i++) {
 900                         if (ISPRINT(sd->rev[i]))   /* printable character ? */
 901                                 bl += sprintf(b + bl, "%c", sd->rev[i]);
 902                         else
 903                                 bl += sprintf(b + bl, " ");
 904                 }
 905                 bl += sprintf(b + bl, "\n");
 906         }
 907         return bl;
 908 }
 909
 910 static void pscsi_bi_endio(struct bio *bio, int error)
 911 {
 912         bio_put(bio);
 913 }
 914
 915 static inline struct bio *pscsi_get_bio(int sg_num)
 916 {
 917         struct bio *bio;
 918         /*
 919          * Use bio_malloc() following the comment in for bio -> struct request
 920          * in block/blk-core.c:blk_make_request()
 921          */
 922         bio = bio_kmalloc(GFP_KERNEL, sg_num);
 923         if (!bio) {
 924                 pr_err("PSCSI: bio_kmalloc() failed\n");
 925                 return NULL;
 926         }
 927         bio->bi_end_io = pscsi_bi_endio;
 928
 929         return bio;
 930 }
 931
 932 static int pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl,
 933                 u32 sgl_nents, enum dma_data_direction data_direction,
 934                 struct bio **hbio)
 935 {
 936         struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
 937         struct bio *bio = NULL, *tbio = NULL;
 938         struct page *page;
 939         struct scatterlist *sg;
 940         u32 data_len = cmd->data_length, i, len, bytes, off;
 941         int nr_pages = (cmd->data_length + sgl[0].offset +
 942                         PAGE_SIZE - 1) >> PAGE_SHIFT;
 943         int nr_vecs = 0, rc;
 944         int rw = (data_direction == DMA_TO_DEVICE);
 945
 946         *hbio = NULL;
 947
 948         pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
 949
 950         for_each_sg(sgl, sg, sgl_nents, i) {
 951                 page = sg_page(sg);
 952                 off = sg->offset;
 953                 len = sg->length;
 954
 955                 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
 956                         page, len, off);
 957
 958                 while (len > 0 && data_len > 0) {
 959                         bytes = min_t(unsigned int, len, PAGE_SIZE - off);
 960                         bytes = min(bytes, data_len);
 961
 962                         if (!bio) {
 963                                 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
 964                                 nr_pages -= nr_vecs;
 965                                 /*
 966                                  * Calls bio_kmalloc() and sets bio->bi_end_io()
 967                                  */
 968                                 bio = pscsi_get_bio(nr_vecs);
 969                                 if (!bio)
 970                                         goto fail;
 971
 972                                 if (rw)
 973                                         bio->bi_rw |= REQ_WRITE;
 974
 975                                 pr_debug("PSCSI: Allocated bio: %p,"
 976                                         " dir: %s nr_vecs: %d\n", bio,
 977                                         (rw) ? "rw" : "r", nr_vecs);
 978                                 /*
 979                                  * Set *hbio pointer to handle the case:
 980                                  * nr_pages > BIO_MAX_PAGES, where additional
 981                                  * bios need to be added to complete a given
 982                                  * command.
 983                                  */
 984                                 if (!*hbio)
 985                                         *hbio = tbio = bio;
 986                                 else
 987                                         tbio = tbio->bi_next = bio;
 988                         }
 989
 990                         pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
 991                                 " bio: %p page: %p len: %d off: %d\n", i, bio,
 992                                 page, len, off);
 993
 994                         rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
 995                                         bio, page, bytes, off);
 996                         if (rc != bytes)
 997                                 goto fail;
 998
 999                         pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1000                                 bio->bi_vcnt, nr_vecs);
1001
1002                         if (bio->bi_vcnt > nr_vecs) {
1003                                 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1004                                         " %d i: %d bio: %p, allocating another"
1005                                         " bio\n", bio->bi_vcnt, i, bio);
1006                                 /*
1007                                  * Clear the pointer so that another bio will
1008                                  * be allocated with pscsi_get_bio() above, the
1009                                  * current bio has already been set *tbio and
1010                                  * bio->bi_next.
1011                                  */
1012                                 bio = NULL;
1013                         }
1014
1015                         page++;
1016                         len -= bytes;
1017                         data_len -= bytes;
1018                         off = 0;
1019                 }
1020         }
1021
1022         return sgl_nents;
1023 fail:
1024         while (*hbio) {
1025                 bio = *hbio;
1026                 *hbio = (*hbio)->bi_next;
1027                 bio->bi_next = NULL;
1028                 bio_endio(bio, 0);      /* XXX: should be error */
1029         }
1030         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1031         return -ENOMEM;
1032 }
1033
1034 /*
1035  * Clear a lun set in the cdb if the initiator talking to use spoke
1036  * and old standards version, as we can't assume the underlying device
1037  * won't choke up on it.
1038  */
1039 static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
1040 {
1041         switch (cdb[0]) {
1042         case READ_10: /* SBC - RDProtect */
1043         case READ_12: /* SBC - RDProtect */
1044         case READ_16: /* SBC - RDProtect */
1045         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1046         case VERIFY: /* SBC - VRProtect */
1047         case VERIFY_16: /* SBC - VRProtect */
1048         case WRITE_VERIFY: /* SBC - VRProtect */
1049         case WRITE_VERIFY_12: /* SBC - VRProtect */
1050         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1051                 break;
1052         default:
1053                 cdb[1] &= 0x1f; /* clear logical unit number */
1054                 break;
1055         }
1056 }
1057
1058 static int pscsi_parse_cdb(struct se_cmd *cmd)
1059 {
1060         unsigned char *cdb = cmd->t_task_cdb;
1061         unsigned int dummy_size;
1062         int ret;
1063
1064         if (cmd->se_cmd_flags & SCF_BIDI) {
1065                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1066                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1067                 return -EINVAL;
1068         }
1069
1070         pscsi_clear_cdb_lun(cdb);
1071
1072         /*
1073          * For REPORT LUNS we always need to emulate the response, for everything
1074          * else the default for pSCSI is to pass the command to the underlying
1075          * LLD / physical hardware.
1076          */
1077         switch (cdb[0]) {
1078         case REPORT_LUNS:
1079                 ret = spc_parse_cdb(cmd, &dummy_size);
1080                 if (ret)
1081                         return ret;
1082                 break;
1083         case READ_6:
1084         case READ_10:
1085         case READ_12:
1086         case READ_16:
1087         case WRITE_6:
1088         case WRITE_10:
1089         case WRITE_12:
1090         case WRITE_16:
1091         case WRITE_VERIFY:
1092                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1093                 /* FALLTHROUGH*/
1094         default:
1095                 cmd->execute_cmd = pscsi_execute_cmd;
1096                 break;
1097         }
1098
1099         return 0;
1100 }
1101
1102 static int pscsi_execute_cmd(struct se_cmd *cmd)
1103 {
1104         struct scatterlist *sgl = cmd->t_data_sg;
1105         u32 sgl_nents = cmd->t_data_nents;
1106         enum dma_data_direction data_direction = cmd->data_direction;
1107         struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
1108         struct pscsi_plugin_task *pt;
1109         struct request *req;
1110         struct bio *hbio;
1111         int ret;
1112
1113         /*
1114          * Dynamically alloc cdb space, since it may be larger than
1115          * TCM_MAX_COMMAND_SIZE
1116          */
1117         pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1118         if (!pt) {
1119                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1120                 return -ENOMEM;
1121         }
1122         cmd->priv = pt;
1123
1124         memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1125                 scsi_command_size(cmd->t_task_cdb));
1126
1127         if (!sgl) {
1128                 req = blk_get_request(pdv->pdv_sd->request_queue,
1129                                 (data_direction == DMA_TO_DEVICE),
1130                                 GFP_KERNEL);
1131                 if (!req || IS_ERR(req)) {
1132                         pr_err("PSCSI: blk_get_request() failed: %ld\n",
1133                                         req ? IS_ERR(req) : -ENOMEM);
1134                         cmd->scsi_sense_reason =
1135                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1136                         goto fail;
1137                 }
1138         } else {
1139                 BUG_ON(!cmd->data_length);
1140
1141                 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1142                 if (ret < 0) {
1143                         cmd->scsi_sense_reason =
1144                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1145                         goto fail;
1146                 }
1147
1148                 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1149                                        GFP_KERNEL);
1150                 if (IS_ERR(req)) {
1151                         pr_err("pSCSI: blk_make_request() failed\n");
1152                         goto fail_free_bio;
1153                 }
1154         }
1155
1156         req->cmd_type = REQ_TYPE_BLOCK_PC;
1157         req->end_io = pscsi_req_done;
1158         req->end_io_data = cmd;
1159         req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1160         req->cmd = &pt->pscsi_cdb[0];
1161         req->sense = &pt->pscsi_sense[0];
1162         req->sense_len = 0;
1163         if (pdv->pdv_sd->type == TYPE_DISK)
1164                 req->timeout = PS_TIMEOUT_DISK;
1165         else
1166                 req->timeout = PS_TIMEOUT_OTHER;
1167         req->retries = PS_RETRY;
1168
1169         blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1170                         (cmd->sam_task_attr == MSG_HEAD_TAG),
1171                         pscsi_req_done);
1172
1173         return 0;
1174
1175 fail_free_bio:
1176         while (hbio) {
1177                 struct bio *bio = hbio;
1178                 hbio = hbio->bi_next;
1179                 bio->bi_next = NULL;
1180                 bio_endio(bio, 0);      /* XXX: should be error */
1181         }
1182         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1183 fail:
1184         kfree(pt);
1185         return -ENOMEM;
1186 }
1187
1188 /*      pscsi_get_device_rev():
1189  *
1190  *
1191  */
1192 static u32 pscsi_get_device_rev(struct se_device *dev)
1193 {
1194         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1195         struct scsi_device *sd = pdv->pdv_sd;
1196
1197         return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1198 }
1199
1200 /*      pscsi_get_device_type():
1201  *
1202  *
1203  */
1204 static u32 pscsi_get_device_type(struct se_device *dev)
1205 {
1206         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1207         struct scsi_device *sd = pdv->pdv_sd;
1208
1209         return sd->type;
1210 }
1211
1212 static sector_t pscsi_get_blocks(struct se_device *dev)
1213 {
1214         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1215
1216         if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1217                 return pdv->pdv_bd->bd_part->nr_sects;
1218
1219         dump_stack();
1220         return 0;
1221 }
1222
1223 static void pscsi_req_done(struct request *req, int uptodate)
1224 {
1225         struct se_cmd *cmd = req->end_io_data;
1226         struct pscsi_plugin_task *pt = cmd->priv;
1227
1228         pt->pscsi_result = req->errors;
1229         pt->pscsi_resid = req->resid_len;
1230
1231         cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1232         if (cmd->scsi_status) {
1233                 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1234                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1235                         pt->pscsi_result);
1236         }
1237
1238         switch (host_byte(pt->pscsi_result)) {
1239         case DID_OK:
1240                 target_complete_cmd(cmd, cmd->scsi_status);
1241                 break;
1242         default:
1243                 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1244                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1245                         pt->pscsi_result);
1246                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1247                 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1248                 break;
1249         }
1250
1251         __blk_put_request(req->q, req);
1252         kfree(pt);
1253 }
1254
1255 static struct se_subsystem_api pscsi_template = {
1256         .name                   = "pscsi",
1257         .owner                  = THIS_MODULE,
1258         .transport_type         = TRANSPORT_PLUGIN_PHBA_PDEV,
1259         .attach_hba             = pscsi_attach_hba,
1260         .detach_hba             = pscsi_detach_hba,
1261         .pmode_enable_hba       = pscsi_pmode_enable_hba,
1262         .allocate_virtdevice    = pscsi_allocate_virtdevice,
1263         .create_virtdevice      = pscsi_create_virtdevice,
1264         .free_device            = pscsi_free_device,
1265         .transport_complete     = pscsi_transport_complete,
1266         .parse_cdb              = pscsi_parse_cdb,
1267         .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1268         .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1269         .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1270         .get_device_rev         = pscsi_get_device_rev,
1271         .get_device_type        = pscsi_get_device_type,
1272         .get_blocks             = pscsi_get_blocks,
1273 };
1274
1275 static int __init pscsi_module_init(void)
1276 {
1277         return transport_subsystem_register(&pscsi_template);
1278 }
1279
1280 static void pscsi_module_exit(void)
1281 {
1282         transport_subsystem_release(&pscsi_template);
1283 }
1284
1285 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1286 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1287 MODULE_LICENSE("GPL");
1288
1289 module_init(pscsi_module_init);
1290 module_exit(pscsi_module_exit);