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 int pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg)
 671 {
 672         struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
 673         struct scsi_device *sd = pdv->pdv_sd;
 674         int result;
 675         struct pscsi_plugin_task *pt = cmd->priv;
 676         unsigned char *cdb;
 677         /*
 678          * Special case for REPORT_LUNs handling where pscsi_plugin_task has
 679          * not been allocated because TCM is handling the emulation directly.
 680          */
 681         if (!pt)
 682                 return 0;
 683
 684         cdb = &pt->pscsi_cdb[0];
 685         result = pt->pscsi_result;
 686         /*
 687          * Hack to make sure that Write-Protect modepage is set if R/O mode is
 688          * forced.
 689          */
 690         if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
 691              (status_byte(result) << 1) == SAM_STAT_GOOD) {
 692                 if (!cmd->se_deve)
 693                         goto after_mode_sense;
 694
 695                 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
 696                         unsigned char *buf = transport_kmap_data_sg(cmd);
 697
 698                         if (cdb[0] == MODE_SENSE_10) {
 699                                 if (!(buf[3] & 0x80))
 700                                         buf[3] |= 0x80;
 701                         } else {
 702                                 if (!(buf[2] & 0x80))
 703                                         buf[2] |= 0x80;
 704                         }
 705
 706                         transport_kunmap_data_sg(cmd);
 707                 }
 708         }
 709 after_mode_sense:
 710
 711         if (sd->type != TYPE_TAPE)
 712                 goto after_mode_select;
 713
 714         /*
 715          * Hack to correctly obtain the initiator requested blocksize for
 716          * TYPE_TAPE.  Since this value is dependent upon each tape media,
 717          * struct scsi_device->sector_size will not contain the correct value
 718          * by default, so we go ahead and set it so
 719          * TRANSPORT(dev)->get_blockdev() returns the correct value to the
 720          * storage engine.
 721          */
 722         if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
 723               (status_byte(result) << 1) == SAM_STAT_GOOD) {
 724                 unsigned char *buf;
 725                 u16 bdl;
 726                 u32 blocksize;
 727
 728                 buf = sg_virt(&sg[0]);
 729                 if (!buf) {
 730                         pr_err("Unable to get buf for scatterlist\n");
 731                         goto after_mode_select;
 732                 }
 733
 734                 if (cdb[0] == MODE_SELECT)
 735                         bdl = (buf[3]);
 736                 else
 737                         bdl = (buf[6] << 8) | (buf[7]);
 738
 739                 if (!bdl)
 740                         goto after_mode_select;
 741
 742                 if (cdb[0] == MODE_SELECT)
 743                         blocksize = (buf[9] << 16) | (buf[10] << 8) |
 744                                         (buf[11]);
 745                 else
 746                         blocksize = (buf[13] << 16) | (buf[14] << 8) |
 747                                         (buf[15]);
 748
 749                 sd->sector_size = blocksize;
 750         }
 751 after_mode_select:
 752
 753         if (status_byte(result) & CHECK_CONDITION)
 754                 return 1;
 755
 756         return 0;
 757 }
 758
 759 enum {
 760         Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
 761         Opt_scsi_lun_id, Opt_err
 762 };
 763
 764 static match_table_t tokens = {
 765         {Opt_scsi_host_id, "scsi_host_id=%d"},
 766         {Opt_scsi_channel_id, "scsi_channel_id=%d"},
 767         {Opt_scsi_target_id, "scsi_target_id=%d"},
 768         {Opt_scsi_lun_id, "scsi_lun_id=%d"},
 769         {Opt_err, NULL}
 770 };
 771
 772 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
 773         struct se_subsystem_dev *se_dev,
 774         const char *page,
 775         ssize_t count)
 776 {
 777         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 778         struct pscsi_hba_virt *phv = hba->hba_ptr;
 779         char *orig, *ptr, *opts;
 780         substring_t args[MAX_OPT_ARGS];
 781         int ret = 0, arg, token;
 782
 783         opts = kstrdup(page, GFP_KERNEL);
 784         if (!opts)
 785                 return -ENOMEM;
 786
 787         orig = opts;
 788
 789         while ((ptr = strsep(&opts, ",\n")) != NULL) {
 790                 if (!*ptr)
 791                         continue;
 792
 793                 token = match_token(ptr, tokens, args);
 794                 switch (token) {
 795                 case Opt_scsi_host_id:
 796                         if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 797                                 pr_err("PSCSI[%d]: Unable to accept"
 798                                         " scsi_host_id while phv_mode =="
 799                                         " PHV_LLD_SCSI_HOST_NO\n",
 800                                         phv->phv_host_id);
 801                                 ret = -EINVAL;
 802                                 goto out;
 803                         }
 804                         match_int(args, &arg);
 805                         pdv->pdv_host_id = arg;
 806                         pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
 807                                 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
 808                         pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
 809                         break;
 810                 case Opt_scsi_channel_id:
 811                         match_int(args, &arg);
 812                         pdv->pdv_channel_id = arg;
 813                         pr_debug("PSCSI[%d]: Referencing SCSI Channel"
 814                                 " ID: %d\n",  phv->phv_host_id,
 815                                 pdv->pdv_channel_id);
 816                         pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
 817                         break;
 818                 case Opt_scsi_target_id:
 819                         match_int(args, &arg);
 820                         pdv->pdv_target_id = arg;
 821                         pr_debug("PSCSI[%d]: Referencing SCSI Target"
 822                                 " ID: %d\n", phv->phv_host_id,
 823                                 pdv->pdv_target_id);
 824                         pdv->pdv_flags |= PDF_HAS_TARGET_ID;
 825                         break;
 826                 case Opt_scsi_lun_id:
 827                         match_int(args, &arg);
 828                         pdv->pdv_lun_id = arg;
 829                         pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
 830                                 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
 831                         pdv->pdv_flags |= PDF_HAS_LUN_ID;
 832                         break;
 833                 default:
 834                         break;
 835                 }
 836         }
 837
 838 out:
 839         kfree(orig);
 840         return (!ret) ? count : ret;
 841 }
 842
 843 static ssize_t pscsi_check_configfs_dev_params(
 844         struct se_hba *hba,
 845         struct se_subsystem_dev *se_dev)
 846 {
 847         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 848
 849         if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
 850             !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
 851             !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
 852                 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
 853                         " scsi_lun_id= parameters\n");
 854                 return -EINVAL;
 855         }
 856
 857         return 0;
 858 }
 859
 860 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
 861                                               struct se_subsystem_dev *se_dev,
 862                                               char *b)
 863 {
 864         struct pscsi_hba_virt *phv = hba->hba_ptr;
 865         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 866         struct scsi_device *sd = pdv->pdv_sd;
 867         unsigned char host_id[16];
 868         ssize_t bl;
 869         int i;
 870
 871         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 872                 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
 873         else
 874                 snprintf(host_id, 16, "PHBA Mode");
 875
 876         bl = sprintf(b, "SCSI Device Bus Location:"
 877                 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
 878                 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
 879                 host_id);
 880
 881         if (sd) {
 882                 bl += sprintf(b + bl, "        ");
 883                 bl += sprintf(b + bl, "Vendor: ");
 884                 for (i = 0; i < 8; i++) {
 885                         if (ISPRINT(sd->vendor[i]))   /* printable character? */
 886                                 bl += sprintf(b + bl, "%c", sd->vendor[i]);
 887                         else
 888                                 bl += sprintf(b + bl, " ");
 889                 }
 890                 bl += sprintf(b + bl, " Model: ");
 891                 for (i = 0; i < 16; i++) {
 892                         if (ISPRINT(sd->model[i]))   /* printable character ? */
 893                                 bl += sprintf(b + bl, "%c", sd->model[i]);
 894                         else
 895                                 bl += sprintf(b + bl, " ");
 896                 }
 897                 bl += sprintf(b + bl, " Rev: ");
 898                 for (i = 0; i < 4; i++) {
 899                         if (ISPRINT(sd->rev[i]))   /* printable character ? */
 900                                 bl += sprintf(b + bl, "%c", sd->rev[i]);
 901                         else
 902                                 bl += sprintf(b + bl, " ");
 903                 }
 904                 bl += sprintf(b + bl, "\n");
 905         }
 906         return bl;
 907 }
 908
 909 static void pscsi_bi_endio(struct bio *bio, int error)
 910 {
 911         bio_put(bio);
 912 }
 913
 914 static inline struct bio *pscsi_get_bio(int sg_num)
 915 {
 916         struct bio *bio;
 917         /*
 918          * Use bio_malloc() following the comment in for bio -> struct request
 919          * in block/blk-core.c:blk_make_request()
 920          */
 921         bio = bio_kmalloc(GFP_KERNEL, sg_num);
 922         if (!bio) {
 923                 pr_err("PSCSI: bio_kmalloc() failed\n");
 924                 return NULL;
 925         }
 926         bio->bi_end_io = pscsi_bi_endio;
 927
 928         return bio;
 929 }
 930
 931 static int pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl,
 932                 u32 sgl_nents, enum dma_data_direction data_direction,
 933                 struct bio **hbio)
 934 {
 935         struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
 936         struct bio *bio = NULL, *tbio = NULL;
 937         struct page *page;
 938         struct scatterlist *sg;
 939         u32 data_len = cmd->data_length, i, len, bytes, off;
 940         int nr_pages = (cmd->data_length + sgl[0].offset +
 941                         PAGE_SIZE - 1) >> PAGE_SHIFT;
 942         int nr_vecs = 0, rc;
 943         int rw = (data_direction == DMA_TO_DEVICE);
 944
 945         *hbio = NULL;
 946
 947         pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
 948
 949         for_each_sg(sgl, sg, sgl_nents, i) {
 950                 page = sg_page(sg);
 951                 off = sg->offset;
 952                 len = sg->length;
 953
 954                 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
 955                         page, len, off);
 956
 957                 while (len > 0 && data_len > 0) {
 958                         bytes = min_t(unsigned int, len, PAGE_SIZE - off);
 959                         bytes = min(bytes, data_len);
 960
 961                         if (!bio) {
 962                                 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
 963                                 nr_pages -= nr_vecs;
 964                                 /*
 965                                  * Calls bio_kmalloc() and sets bio->bi_end_io()
 966                                  */
 967                                 bio = pscsi_get_bio(nr_vecs);
 968                                 if (!bio)
 969                                         goto fail;
 970
 971                                 if (rw)
 972                                         bio->bi_rw |= REQ_WRITE;
 973
 974                                 pr_debug("PSCSI: Allocated bio: %p,"
 975                                         " dir: %s nr_vecs: %d\n", bio,
 976                                         (rw) ? "rw" : "r", nr_vecs);
 977                                 /*
 978                                  * Set *hbio pointer to handle the case:
 979                                  * nr_pages > BIO_MAX_PAGES, where additional
 980                                  * bios need to be added to complete a given
 981                                  * command.
 982                                  */
 983                                 if (!*hbio)
 984                                         *hbio = tbio = bio;
 985                                 else
 986                                         tbio = tbio->bi_next = bio;
 987                         }
 988
 989                         pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
 990                                 " bio: %p page: %p len: %d off: %d\n", i, bio,
 991                                 page, len, off);
 992
 993                         rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
 994                                         bio, page, bytes, off);
 995                         if (rc != bytes)
 996                                 goto fail;
 997
 998                         pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
 999                                 bio->bi_vcnt, nr_vecs);
1000
1001                         if (bio->bi_vcnt > nr_vecs) {
1002                                 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1003                                         " %d i: %d bio: %p, allocating another"
1004                                         " bio\n", bio->bi_vcnt, i, bio);
1005                                 /*
1006                                  * Clear the pointer so that another bio will
1007                                  * be allocated with pscsi_get_bio() above, the
1008                                  * current bio has already been set *tbio and
1009                                  * bio->bi_next.
1010                                  */
1011                                 bio = NULL;
1012                         }
1013
1014                         page++;
1015                         len -= bytes;
1016                         data_len -= bytes;
1017                         off = 0;
1018                 }
1019         }
1020
1021         return sgl_nents;
1022 fail:
1023         while (*hbio) {
1024                 bio = *hbio;
1025                 *hbio = (*hbio)->bi_next;
1026                 bio->bi_next = NULL;
1027                 bio_endio(bio, 0);      /* XXX: should be error */
1028         }
1029         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1030         return -ENOMEM;
1031 }
1032
1033 /*
1034  * Clear a lun set in the cdb if the initiator talking to use spoke
1035  * and old standards version, as we can't assume the underlying device
1036  * won't choke up on it.
1037  */
1038 static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
1039 {
1040         switch (cdb[0]) {
1041         case READ_10: /* SBC - RDProtect */
1042         case READ_12: /* SBC - RDProtect */
1043         case READ_16: /* SBC - RDProtect */
1044         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1045         case VERIFY: /* SBC - VRProtect */
1046         case VERIFY_16: /* SBC - VRProtect */
1047         case WRITE_VERIFY: /* SBC - VRProtect */
1048         case WRITE_VERIFY_12: /* SBC - VRProtect */
1049         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1050                 break;
1051         default:
1052                 cdb[1] &= 0x1f; /* clear logical unit number */
1053                 break;
1054         }
1055 }
1056
1057 static int pscsi_parse_cdb(struct se_cmd *cmd)
1058 {
1059         unsigned char *cdb = cmd->t_task_cdb;
1060         unsigned int dummy_size;
1061         int ret;
1062
1063         if (cmd->se_cmd_flags & SCF_BIDI) {
1064                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1065                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1066                 return -EINVAL;
1067         }
1068
1069         pscsi_clear_cdb_lun(cdb);
1070
1071         /*
1072          * For REPORT LUNS we always need to emulate the response, for everything
1073          * else the default for pSCSI is to pass the command to the underlying
1074          * LLD / physical hardware.
1075          */
1076         switch (cdb[0]) {
1077         case REPORT_LUNS:
1078                 ret = spc_parse_cdb(cmd, &dummy_size);
1079                 if (ret)
1080                         return ret;
1081                 break;
1082         case READ_6:
1083         case READ_10:
1084         case READ_12:
1085         case READ_16:
1086         case WRITE_6:
1087         case WRITE_10:
1088         case WRITE_12:
1089         case WRITE_16:
1090         case WRITE_VERIFY:
1091                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1092                 /* FALLTHROUGH*/
1093         default:
1094                 cmd->execute_cmd = pscsi_execute_cmd;
1095                 break;
1096         }
1097
1098         return 0;
1099 }
1100
1101 static int pscsi_execute_cmd(struct se_cmd *cmd)
1102 {
1103         struct scatterlist *sgl = cmd->t_data_sg;
1104         u32 sgl_nents = cmd->t_data_nents;
1105         enum dma_data_direction data_direction = cmd->data_direction;
1106         struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
1107         struct pscsi_plugin_task *pt;
1108         struct request *req;
1109         struct bio *hbio;
1110         int ret;
1111
1112         /*
1113          * Dynamically alloc cdb space, since it may be larger than
1114          * TCM_MAX_COMMAND_SIZE
1115          */
1116         pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1117         if (!pt) {
1118                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1119                 return -ENOMEM;
1120         }
1121         cmd->priv = pt;
1122
1123         memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1124                 scsi_command_size(cmd->t_task_cdb));
1125
1126         if (!sgl) {
1127                 req = blk_get_request(pdv->pdv_sd->request_queue,
1128                                 (data_direction == DMA_TO_DEVICE),
1129                                 GFP_KERNEL);
1130                 if (!req || IS_ERR(req)) {
1131                         pr_err("PSCSI: blk_get_request() failed: %ld\n",
1132                                         req ? IS_ERR(req) : -ENOMEM);
1133                         cmd->scsi_sense_reason =
1134                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1135                         goto fail;
1136                 }
1137         } else {
1138                 BUG_ON(!cmd->data_length);
1139
1140                 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1141                 if (ret < 0) {
1142                         cmd->scsi_sense_reason =
1143                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1144                         goto fail;
1145                 }
1146
1147                 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1148                                        GFP_KERNEL);
1149                 if (IS_ERR(req)) {
1150                         pr_err("pSCSI: blk_make_request() failed\n");
1151                         goto fail_free_bio;
1152                 }
1153         }
1154
1155         req->cmd_type = REQ_TYPE_BLOCK_PC;
1156         req->end_io = pscsi_req_done;
1157         req->end_io_data = cmd;
1158         req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1159         req->cmd = &pt->pscsi_cdb[0];
1160         req->sense = &pt->pscsi_sense[0];
1161         req->sense_len = 0;
1162         if (pdv->pdv_sd->type == TYPE_DISK)
1163                 req->timeout = PS_TIMEOUT_DISK;
1164         else
1165                 req->timeout = PS_TIMEOUT_OTHER;
1166         req->retries = PS_RETRY;
1167
1168         blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1169                         (cmd->sam_task_attr == MSG_HEAD_TAG),
1170                         pscsi_req_done);
1171
1172         return 0;
1173
1174 fail_free_bio:
1175         while (hbio) {
1176                 struct bio *bio = hbio;
1177                 hbio = hbio->bi_next;
1178                 bio->bi_next = NULL;
1179                 bio_endio(bio, 0);      /* XXX: should be error */
1180         }
1181         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1182 fail:
1183         kfree(pt);
1184         return -ENOMEM;
1185 }
1186
1187 static unsigned char *pscsi_get_sense_buffer(struct se_cmd *cmd)
1188 {
1189         struct pscsi_plugin_task *pt = cmd->priv;
1190
1191         return pt->pscsi_sense;
1192 }
1193
1194 /*      pscsi_get_device_rev():
1195  *
1196  *
1197  */
1198 static u32 pscsi_get_device_rev(struct se_device *dev)
1199 {
1200         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1201         struct scsi_device *sd = pdv->pdv_sd;
1202
1203         return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1204 }
1205
1206 /*      pscsi_get_device_type():
1207  *
1208  *
1209  */
1210 static u32 pscsi_get_device_type(struct se_device *dev)
1211 {
1212         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1213         struct scsi_device *sd = pdv->pdv_sd;
1214
1215         return sd->type;
1216 }
1217
1218 static sector_t pscsi_get_blocks(struct se_device *dev)
1219 {
1220         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1221
1222         if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1223                 return pdv->pdv_bd->bd_part->nr_sects;
1224
1225         dump_stack();
1226         return 0;
1227 }
1228
1229 static void pscsi_req_done(struct request *req, int uptodate)
1230 {
1231         struct se_cmd *cmd = req->end_io_data;
1232         struct pscsi_plugin_task *pt = cmd->priv;
1233
1234         pt->pscsi_result = req->errors;
1235         pt->pscsi_resid = req->resid_len;
1236
1237         cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1238         if (cmd->scsi_status) {
1239                 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1240                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1241                         pt->pscsi_result);
1242         }
1243
1244         switch (host_byte(pt->pscsi_result)) {
1245         case DID_OK:
1246                 target_complete_cmd(cmd, cmd->scsi_status);
1247                 break;
1248         default:
1249                 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1250                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1251                         pt->pscsi_result);
1252                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1253                 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1254                 break;
1255         }
1256
1257         __blk_put_request(req->q, req);
1258         kfree(pt);
1259 }
1260
1261 static struct se_subsystem_api pscsi_template = {
1262         .name                   = "pscsi",
1263         .owner                  = THIS_MODULE,
1264         .transport_type         = TRANSPORT_PLUGIN_PHBA_PDEV,
1265         .attach_hba             = pscsi_attach_hba,
1266         .detach_hba             = pscsi_detach_hba,
1267         .pmode_enable_hba       = pscsi_pmode_enable_hba,
1268         .allocate_virtdevice    = pscsi_allocate_virtdevice,
1269         .create_virtdevice      = pscsi_create_virtdevice,
1270         .free_device            = pscsi_free_device,
1271         .transport_complete     = pscsi_transport_complete,
1272         .parse_cdb              = pscsi_parse_cdb,
1273         .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1274         .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1275         .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1276         .get_sense_buffer       = pscsi_get_sense_buffer,
1277         .get_device_rev         = pscsi_get_device_rev,
1278         .get_device_type        = pscsi_get_device_type,
1279         .get_blocks             = pscsi_get_blocks,
1280 };
1281
1282 static int __init pscsi_module_init(void)
1283 {
1284         return transport_subsystem_register(&pscsi_template);
1285 }
1286
1287 static void pscsi_module_exit(void)
1288 {
1289         transport_subsystem_release(&pscsi_template);
1290 }
1291
1292 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1293 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1294 MODULE_LICENSE("GPL");
1295
1296 module_init(pscsi_module_init);
1297 module_exit(pscsi_module_exit);