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 void pscsi_req_done(struct request *, int);
  59
  60 /*      pscsi_attach_hba():
  61  *
  62  *      pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
  63  *      from the passed SCSI Host ID.
  64  */
  65 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
  66 {
  67         struct pscsi_hba_virt *phv;
  68
  69         phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
  70         if (!phv) {
  71                 pr_err("Unable to allocate struct pscsi_hba_virt\n");
  72                 return -ENOMEM;
  73         }
  74         phv->phv_host_id = host_id;
  75         phv->phv_mode = PHV_VIRTUAL_HOST_ID;
  76
  77         hba->hba_ptr = phv;
  78
  79         pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
  80                 " Generic Target Core Stack %s\n", hba->hba_id,
  81                 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
  82         pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
  83                hba->hba_id);
  84
  85         return 0;
  86 }
  87
  88 static void pscsi_detach_hba(struct se_hba *hba)
  89 {
  90         struct pscsi_hba_virt *phv = hba->hba_ptr;
  91         struct Scsi_Host *scsi_host = phv->phv_lld_host;
  92
  93         if (scsi_host) {
  94                 scsi_host_put(scsi_host);
  95
  96                 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
  97                         " Generic Target Core\n", hba->hba_id,
  98                         (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
  99                         "Unknown");
 100         } else
 101                 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
 102                         " from Generic Target Core\n", hba->hba_id);
 103
 104         kfree(phv);
 105         hba->hba_ptr = NULL;
 106 }
 107
 108 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
 109 {
 110         struct pscsi_hba_virt *phv = hba->hba_ptr;
 111         struct Scsi_Host *sh = phv->phv_lld_host;
 112         /*
 113          * Release the struct Scsi_Host
 114          */
 115         if (!mode_flag) {
 116                 if (!sh)
 117                         return 0;
 118
 119                 phv->phv_lld_host = NULL;
 120                 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
 121
 122                 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
 123                         " %s\n", hba->hba_id, (sh->hostt->name) ?
 124                         (sh->hostt->name) : "Unknown");
 125
 126                 scsi_host_put(sh);
 127                 return 0;
 128         }
 129         /*
 130          * Otherwise, locate struct Scsi_Host from the original passed
 131          * pSCSI Host ID and enable for phba mode
 132          */
 133         sh = scsi_host_lookup(phv->phv_host_id);
 134         if (IS_ERR(sh)) {
 135                 pr_err("pSCSI: Unable to locate SCSI Host for"
 136                         " phv_host_id: %d\n", phv->phv_host_id);
 137                 return PTR_ERR(sh);
 138         }
 139
 140         phv->phv_lld_host = sh;
 141         phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
 142
 143         pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
 144                 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
 145
 146         return 1;
 147 }
 148
 149 static void pscsi_tape_read_blocksize(struct se_device *dev,
 150                 struct scsi_device *sdev)
 151 {
 152         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 153         int ret;
 154
 155         buf = kzalloc(12, GFP_KERNEL);
 156         if (!buf)
 157                 return;
 158
 159         memset(cdb, 0, MAX_COMMAND_SIZE);
 160         cdb[0] = MODE_SENSE;
 161         cdb[4] = 0x0c; /* 12 bytes */
 162
 163         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
 164                         HZ, 1, NULL);
 165         if (ret)
 166                 goto out_free;
 167
 168         /*
 169          * If MODE_SENSE still returns zero, set the default value to 1024.
 170          */
 171         sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
 172         if (!sdev->sector_size)
 173                 sdev->sector_size = 1024;
 174 out_free:
 175         kfree(buf);
 176 }
 177
 178 static void
 179 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
 180 {
 181         unsigned char *buf;
 182
 183         if (sdev->inquiry_len < INQUIRY_LEN)
 184                 return;
 185
 186         buf = sdev->inquiry;
 187         if (!buf)
 188                 return;
 189         /*
 190          * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
 191          */
 192         memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
 193         memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
 194         memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
 195 }
 196
 197 static int
 198 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
 199 {
 200         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 201         int ret;
 202
 203         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 204         if (!buf)
 205                 return -ENOMEM;
 206
 207         memset(cdb, 0, MAX_COMMAND_SIZE);
 208         cdb[0] = INQUIRY;
 209         cdb[1] = 0x01; /* Query VPD */
 210         cdb[2] = 0x80; /* Unit Serial Number */
 211         cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
 212         cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
 213
 214         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 215                               INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
 216         if (ret)
 217                 goto out_free;
 218
 219         snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
 220
 221         wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
 222
 223         kfree(buf);
 224         return 0;
 225
 226 out_free:
 227         kfree(buf);
 228         return -EPERM;
 229 }
 230
 231 static void
 232 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
 233                 struct t10_wwn *wwn)
 234 {
 235         unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
 236         int ident_len, page_len, off = 4, ret;
 237         struct t10_vpd *vpd;
 238
 239         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 240         if (!buf)
 241                 return;
 242
 243         memset(cdb, 0, MAX_COMMAND_SIZE);
 244         cdb[0] = INQUIRY;
 245         cdb[1] = 0x01; /* Query VPD */
 246         cdb[2] = 0x83; /* Device Identifier */
 247         cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
 248         cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
 249
 250         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 251                               INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
 252                               NULL, HZ, 1, NULL);
 253         if (ret)
 254                 goto out;
 255
 256         page_len = (buf[2] << 8) | buf[3];
 257         while (page_len > 0) {
 258                 /* Grab a pointer to the Identification descriptor */
 259                 page_83 = &buf[off];
 260                 ident_len = page_83[3];
 261                 if (!ident_len) {
 262                         pr_err("page_83[3]: identifier"
 263                                         " length zero!\n");
 264                         break;
 265                 }
 266                 pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
 267
 268                 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
 269                 if (!vpd) {
 270                         pr_err("Unable to allocate memory for"
 271                                         " struct t10_vpd\n");
 272                         goto out;
 273                 }
 274                 INIT_LIST_HEAD(&vpd->vpd_list);
 275
 276                 transport_set_vpd_proto_id(vpd, page_83);
 277                 transport_set_vpd_assoc(vpd, page_83);
 278
 279                 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
 280                         off += (ident_len + 4);
 281                         page_len -= (ident_len + 4);
 282                         kfree(vpd);
 283                         continue;
 284                 }
 285                 if (transport_set_vpd_ident(vpd, page_83) < 0) {
 286                         off += (ident_len + 4);
 287                         page_len -= (ident_len + 4);
 288                         kfree(vpd);
 289                         continue;
 290                 }
 291
 292                 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
 293                 off += (ident_len + 4);
 294                 page_len -= (ident_len + 4);
 295         }
 296
 297 out:
 298         kfree(buf);
 299 }
 300
 301 /*      pscsi_add_device_to_list():
 302  *
 303  *
 304  */
 305 static struct se_device *pscsi_add_device_to_list(
 306         struct se_hba *hba,
 307         struct se_subsystem_dev *se_dev,
 308         struct pscsi_dev_virt *pdv,
 309         struct scsi_device *sd,
 310         int dev_flags)
 311 {
 312         struct se_device *dev;
 313         struct se_dev_limits dev_limits;
 314         struct request_queue *q;
 315         struct queue_limits *limits;
 316
 317         memset(&dev_limits, 0, sizeof(struct se_dev_limits));
 318
 319         if (!sd->queue_depth) {
 320                 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
 321
 322                 pr_err("Set broken SCSI Device %d:%d:%d"
 323                         " queue_depth to %d\n", sd->channel, sd->id,
 324                                 sd->lun, sd->queue_depth);
 325         }
 326         /*
 327          * Setup the local scope queue_limits from struct request_queue->limits
 328          * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
 329          */
 330         q = sd->request_queue;
 331         limits = &dev_limits.limits;
 332         limits->logical_block_size = sd->sector_size;
 333         limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
 334         limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
 335         dev_limits.hw_queue_depth = sd->queue_depth;
 336         dev_limits.queue_depth = sd->queue_depth;
 337         /*
 338          * Setup our standard INQUIRY info into se_dev->t10_wwn
 339          */
 340         pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
 341
 342         /*
 343          * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
 344          * which has already been referenced with Linux SCSI code with
 345          * scsi_device_get() in this file's pscsi_create_virtdevice().
 346          *
 347          * The passthrough operations called by the transport_add_device_*
 348          * function below will require this pointer to be set for passthroug
 349          *  ops.
 350          *
 351          * For the shutdown case in pscsi_free_device(), this struct
 352          * scsi_device  reference is released with Linux SCSI code
 353          * scsi_device_put() and the pdv->pdv_sd cleared.
 354          */
 355         pdv->pdv_sd = sd;
 356         dev = transport_add_device_to_core_hba(hba, &pscsi_template,
 357                                 se_dev, dev_flags, pdv,
 358                                 &dev_limits, NULL, NULL);
 359         if (!dev) {
 360                 pdv->pdv_sd = NULL;
 361                 return NULL;
 362         }
 363
 364         /*
 365          * Locate VPD WWN Information used for various purposes within
 366          * the Storage Engine.
 367          */
 368         if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
 369                 /*
 370                  * If VPD Unit Serial returned GOOD status, try
 371                  * VPD Device Identification page (0x83).
 372                  */
 373                 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
 374         }
 375
 376         /*
 377          * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
 378          */
 379         if (sd->type == TYPE_TAPE)
 380                 pscsi_tape_read_blocksize(dev, sd);
 381         return dev;
 382 }
 383
 384 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
 385 {
 386         struct pscsi_dev_virt *pdv;
 387
 388         pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
 389         if (!pdv) {
 390                 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
 391                 return NULL;
 392         }
 393         pdv->pdv_se_hba = hba;
 394
 395         pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
 396         return pdv;
 397 }
 398
 399 /*
 400  * Called with struct Scsi_Host->host_lock called.
 401  */
 402 static struct se_device *pscsi_create_type_disk(
 403         struct scsi_device *sd,
 404         struct pscsi_dev_virt *pdv,
 405         struct se_subsystem_dev *se_dev,
 406         struct se_hba *hba)
 407         __releases(sh->host_lock)
 408 {
 409         struct se_device *dev;
 410         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 411         struct Scsi_Host *sh = sd->host;
 412         struct block_device *bd;
 413         u32 dev_flags = 0;
 414
 415         if (scsi_device_get(sd)) {
 416                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 417                         sh->host_no, sd->channel, sd->id, sd->lun);
 418                 spin_unlock_irq(sh->host_lock);
 419                 return NULL;
 420         }
 421         spin_unlock_irq(sh->host_lock);
 422         /*
 423          * Claim exclusive struct block_device access to struct scsi_device
 424          * for TYPE_DISK using supplied udev_path
 425          */
 426         bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
 427                                 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
 428         if (IS_ERR(bd)) {
 429                 pr_err("pSCSI: blkdev_get_by_path() failed\n");
 430                 scsi_device_put(sd);
 431                 return NULL;
 432         }
 433         pdv->pdv_bd = bd;
 434
 435         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 436         if (!dev) {
 437                 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 438                 scsi_device_put(sd);
 439                 return NULL;
 440         }
 441         pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
 442                 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
 443
 444         return dev;
 445 }
 446
 447 /*
 448  * Called with struct Scsi_Host->host_lock called.
 449  */
 450 static struct se_device *pscsi_create_type_rom(
 451         struct scsi_device *sd,
 452         struct pscsi_dev_virt *pdv,
 453         struct se_subsystem_dev *se_dev,
 454         struct se_hba *hba)
 455         __releases(sh->host_lock)
 456 {
 457         struct se_device *dev;
 458         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 459         struct Scsi_Host *sh = sd->host;
 460         u32 dev_flags = 0;
 461
 462         if (scsi_device_get(sd)) {
 463                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 464                         sh->host_no, sd->channel, sd->id, sd->lun);
 465                 spin_unlock_irq(sh->host_lock);
 466                 return NULL;
 467         }
 468         spin_unlock_irq(sh->host_lock);
 469
 470         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 471         if (!dev) {
 472                 scsi_device_put(sd);
 473                 return NULL;
 474         }
 475         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 476                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 477                 sd->channel, sd->id, sd->lun);
 478
 479         return dev;
 480 }
 481
 482 /*
 483  *Called with struct Scsi_Host->host_lock called.
 484  */
 485 static struct se_device *pscsi_create_type_other(
 486         struct scsi_device *sd,
 487         struct pscsi_dev_virt *pdv,
 488         struct se_subsystem_dev *se_dev,
 489         struct se_hba *hba)
 490         __releases(sh->host_lock)
 491 {
 492         struct se_device *dev;
 493         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 494         struct Scsi_Host *sh = sd->host;
 495         u32 dev_flags = 0;
 496
 497         spin_unlock_irq(sh->host_lock);
 498         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 499         if (!dev)
 500                 return NULL;
 501
 502         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 503                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 504                 sd->channel, sd->id, sd->lun);
 505
 506         return dev;
 507 }
 508
 509 static struct se_device *pscsi_create_virtdevice(
 510         struct se_hba *hba,
 511         struct se_subsystem_dev *se_dev,
 512         void *p)
 513 {
 514         struct pscsi_dev_virt *pdv = p;
 515         struct se_device *dev;
 516         struct scsi_device *sd;
 517         struct pscsi_hba_virt *phv = hba->hba_ptr;
 518         struct Scsi_Host *sh = phv->phv_lld_host;
 519         int legacy_mode_enable = 0;
 520
 521         if (!pdv) {
 522                 pr_err("Unable to locate struct pscsi_dev_virt"
 523                                 " parameter\n");
 524                 return ERR_PTR(-EINVAL);
 525         }
 526         /*
 527          * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
 528          * struct Scsi_Host we will need to bring the TCM/pSCSI object online
 529          */
 530         if (!sh) {
 531                 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 532                         pr_err("pSCSI: Unable to locate struct"
 533                                 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
 534                         return ERR_PTR(-ENODEV);
 535                 }
 536                 /*
 537                  * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
 538                  * reference, we enforce that udev_path has been set
 539                  */
 540                 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
 541                         pr_err("pSCSI: udev_path attribute has not"
 542                                 " been set before ENABLE=1\n");
 543                         return ERR_PTR(-EINVAL);
 544                 }
 545                 /*
 546                  * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
 547                  * use the original TCM hba ID to reference Linux/SCSI Host No
 548                  * and enable for PHV_LLD_SCSI_HOST_NO mode.
 549                  */
 550                 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
 551                         spin_lock(&hba->device_lock);
 552                         if (!list_empty(&hba->hba_dev_list)) {
 553                                 pr_err("pSCSI: Unable to set hba_mode"
 554                                         " with active devices\n");
 555                                 spin_unlock(&hba->device_lock);
 556                                 return ERR_PTR(-EEXIST);
 557                         }
 558                         spin_unlock(&hba->device_lock);
 559
 560                         if (pscsi_pmode_enable_hba(hba, 1) != 1)
 561                                 return ERR_PTR(-ENODEV);
 562
 563                         legacy_mode_enable = 1;
 564                         hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
 565                         sh = phv->phv_lld_host;
 566                 } else {
 567                         sh = scsi_host_lookup(pdv->pdv_host_id);
 568                         if (IS_ERR(sh)) {
 569                                 pr_err("pSCSI: Unable to locate"
 570                                         " pdv_host_id: %d\n", pdv->pdv_host_id);
 571                                 return ERR_CAST(sh);
 572                         }
 573                 }
 574         } else {
 575                 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
 576                         pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
 577                                 " struct Scsi_Host exists\n");
 578                         return ERR_PTR(-EEXIST);
 579                 }
 580         }
 581
 582         spin_lock_irq(sh->host_lock);
 583         list_for_each_entry(sd, &sh->__devices, siblings) {
 584                 if ((pdv->pdv_channel_id != sd->channel) ||
 585                     (pdv->pdv_target_id != sd->id) ||
 586                     (pdv->pdv_lun_id != sd->lun))
 587                         continue;
 588                 /*
 589                  * Functions will release the held struct scsi_host->host_lock
 590                  * before calling calling pscsi_add_device_to_list() to register
 591                  * struct scsi_device with target_core_mod.
 592                  */
 593                 switch (sd->type) {
 594                 case TYPE_DISK:
 595                         dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
 596                         break;
 597                 case TYPE_ROM:
 598                         dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
 599                         break;
 600                 default:
 601                         dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
 602                         break;
 603                 }
 604
 605                 if (!dev) {
 606                         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 607                                 scsi_host_put(sh);
 608                         else if (legacy_mode_enable) {
 609                                 pscsi_pmode_enable_hba(hba, 0);
 610                                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 611                         }
 612                         pdv->pdv_sd = NULL;
 613                         return ERR_PTR(-ENODEV);
 614                 }
 615                 return dev;
 616         }
 617         spin_unlock_irq(sh->host_lock);
 618
 619         pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
 620                 pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);
 621
 622         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 623                 scsi_host_put(sh);
 624         else if (legacy_mode_enable) {
 625                 pscsi_pmode_enable_hba(hba, 0);
 626                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 627         }
 628
 629         return ERR_PTR(-ENODEV);
 630 }
 631
 632 /*      pscsi_free_device(): (Part of se_subsystem_api_t template)
 633  *
 634  *
 635  */
 636 static void pscsi_free_device(void *p)
 637 {
 638         struct pscsi_dev_virt *pdv = p;
 639         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 640         struct scsi_device *sd = pdv->pdv_sd;
 641
 642         if (sd) {
 643                 /*
 644                  * Release exclusive pSCSI internal struct block_device claim for
 645                  * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
 646                  */
 647                 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
 648                         blkdev_put(pdv->pdv_bd,
 649                                    FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 650                         pdv->pdv_bd = NULL;
 651                 }
 652                 /*
 653                  * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
 654                  * to struct Scsi_Host now.
 655                  */
 656                 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
 657                     (phv->phv_lld_host != NULL))
 658                         scsi_host_put(phv->phv_lld_host);
 659
 660                 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
 661                         scsi_device_put(sd);
 662
 663                 pdv->pdv_sd = NULL;
 664         }
 665
 666         kfree(pdv);
 667 }
 668
 669 static int pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg)
 670 {
 671         struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
 672         struct scsi_device *sd = pdv->pdv_sd;
 673         int result;
 674         struct pscsi_plugin_task *pt = cmd->priv;
 675         unsigned char *cdb = &pt->pscsi_cdb[0];
 676
 677         result = pt->pscsi_result;
 678         /*
 679          * Hack to make sure that Write-Protect modepage is set if R/O mode is
 680          * forced.
 681          */
 682         if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
 683              (status_byte(result) << 1) == SAM_STAT_GOOD) {
 684                 if (!cmd->se_deve)
 685                         goto after_mode_sense;
 686
 687                 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
 688                         unsigned char *buf = transport_kmap_data_sg(cmd);
 689
 690                         if (cdb[0] == MODE_SENSE_10) {
 691                                 if (!(buf[3] & 0x80))
 692                                         buf[3] |= 0x80;
 693                         } else {
 694                                 if (!(buf[2] & 0x80))
 695                                         buf[2] |= 0x80;
 696                         }
 697
 698                         transport_kunmap_data_sg(cmd);
 699                 }
 700         }
 701 after_mode_sense:
 702
 703         if (sd->type != TYPE_TAPE)
 704                 goto after_mode_select;
 705
 706         /*
 707          * Hack to correctly obtain the initiator requested blocksize for
 708          * TYPE_TAPE.  Since this value is dependent upon each tape media,
 709          * struct scsi_device->sector_size will not contain the correct value
 710          * by default, so we go ahead and set it so
 711          * TRANSPORT(dev)->get_blockdev() returns the correct value to the
 712          * storage engine.
 713          */
 714         if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
 715               (status_byte(result) << 1) == SAM_STAT_GOOD) {
 716                 unsigned char *buf;
 717                 u16 bdl;
 718                 u32 blocksize;
 719
 720                 buf = sg_virt(&sg[0]);
 721                 if (!buf) {
 722                         pr_err("Unable to get buf for scatterlist\n");
 723                         goto after_mode_select;
 724                 }
 725
 726                 if (cdb[0] == MODE_SELECT)
 727                         bdl = (buf[3]);
 728                 else
 729                         bdl = (buf[6] << 8) | (buf[7]);
 730
 731                 if (!bdl)
 732                         goto after_mode_select;
 733
 734                 if (cdb[0] == MODE_SELECT)
 735                         blocksize = (buf[9] << 16) | (buf[10] << 8) |
 736                                         (buf[11]);
 737                 else
 738                         blocksize = (buf[13] << 16) | (buf[14] << 8) |
 739                                         (buf[15]);
 740
 741                 sd->sector_size = blocksize;
 742         }
 743 after_mode_select:
 744
 745         if (status_byte(result) & CHECK_CONDITION)
 746                 return 1;
 747
 748         return 0;
 749 }
 750
 751 enum {
 752         Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
 753         Opt_scsi_lun_id, Opt_err
 754 };
 755
 756 static match_table_t tokens = {
 757         {Opt_scsi_host_id, "scsi_host_id=%d"},
 758         {Opt_scsi_channel_id, "scsi_channel_id=%d"},
 759         {Opt_scsi_target_id, "scsi_target_id=%d"},
 760         {Opt_scsi_lun_id, "scsi_lun_id=%d"},
 761         {Opt_err, NULL}
 762 };
 763
 764 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
 765         struct se_subsystem_dev *se_dev,
 766         const char *page,
 767         ssize_t count)
 768 {
 769         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 770         struct pscsi_hba_virt *phv = hba->hba_ptr;
 771         char *orig, *ptr, *opts;
 772         substring_t args[MAX_OPT_ARGS];
 773         int ret = 0, arg, token;
 774
 775         opts = kstrdup(page, GFP_KERNEL);
 776         if (!opts)
 777                 return -ENOMEM;
 778
 779         orig = opts;
 780
 781         while ((ptr = strsep(&opts, ",\n")) != NULL) {
 782                 if (!*ptr)
 783                         continue;
 784
 785                 token = match_token(ptr, tokens, args);
 786                 switch (token) {
 787                 case Opt_scsi_host_id:
 788                         if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 789                                 pr_err("PSCSI[%d]: Unable to accept"
 790                                         " scsi_host_id while phv_mode =="
 791                                         " PHV_LLD_SCSI_HOST_NO\n",
 792                                         phv->phv_host_id);
 793                                 ret = -EINVAL;
 794                                 goto out;
 795                         }
 796                         match_int(args, &arg);
 797                         pdv->pdv_host_id = arg;
 798                         pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
 799                                 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
 800                         pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
 801                         break;
 802                 case Opt_scsi_channel_id:
 803                         match_int(args, &arg);
 804                         pdv->pdv_channel_id = arg;
 805                         pr_debug("PSCSI[%d]: Referencing SCSI Channel"
 806                                 " ID: %d\n",  phv->phv_host_id,
 807                                 pdv->pdv_channel_id);
 808                         pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
 809                         break;
 810                 case Opt_scsi_target_id:
 811                         match_int(args, &arg);
 812                         pdv->pdv_target_id = arg;
 813                         pr_debug("PSCSI[%d]: Referencing SCSI Target"
 814                                 " ID: %d\n", phv->phv_host_id,
 815                                 pdv->pdv_target_id);
 816                         pdv->pdv_flags |= PDF_HAS_TARGET_ID;
 817                         break;
 818                 case Opt_scsi_lun_id:
 819                         match_int(args, &arg);
 820                         pdv->pdv_lun_id = arg;
 821                         pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
 822                                 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
 823                         pdv->pdv_flags |= PDF_HAS_LUN_ID;
 824                         break;
 825                 default:
 826                         break;
 827                 }
 828         }
 829
 830 out:
 831         kfree(orig);
 832         return (!ret) ? count : ret;
 833 }
 834
 835 static ssize_t pscsi_check_configfs_dev_params(
 836         struct se_hba *hba,
 837         struct se_subsystem_dev *se_dev)
 838 {
 839         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 840
 841         if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
 842             !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
 843             !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
 844                 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
 845                         " scsi_lun_id= parameters\n");
 846                 return -EINVAL;
 847         }
 848
 849         return 0;
 850 }
 851
 852 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
 853                                               struct se_subsystem_dev *se_dev,
 854                                               char *b)
 855 {
 856         struct pscsi_hba_virt *phv = hba->hba_ptr;
 857         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 858         struct scsi_device *sd = pdv->pdv_sd;
 859         unsigned char host_id[16];
 860         ssize_t bl;
 861         int i;
 862
 863         if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 864                 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
 865         else
 866                 snprintf(host_id, 16, "PHBA Mode");
 867
 868         bl = sprintf(b, "SCSI Device Bus Location:"
 869                 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
 870                 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
 871                 host_id);
 872
 873         if (sd) {
 874                 bl += sprintf(b + bl, "        ");
 875                 bl += sprintf(b + bl, "Vendor: ");
 876                 for (i = 0; i < 8; i++) {
 877                         if (ISPRINT(sd->vendor[i]))   /* printable character? */
 878                                 bl += sprintf(b + bl, "%c", sd->vendor[i]);
 879                         else
 880                                 bl += sprintf(b + bl, " ");
 881                 }
 882                 bl += sprintf(b + bl, " Model: ");
 883                 for (i = 0; i < 16; i++) {
 884                         if (ISPRINT(sd->model[i]))   /* printable character ? */
 885                                 bl += sprintf(b + bl, "%c", sd->model[i]);
 886                         else
 887                                 bl += sprintf(b + bl, " ");
 888                 }
 889                 bl += sprintf(b + bl, " Rev: ");
 890                 for (i = 0; i < 4; i++) {
 891                         if (ISPRINT(sd->rev[i]))   /* printable character ? */
 892                                 bl += sprintf(b + bl, "%c", sd->rev[i]);
 893                         else
 894                                 bl += sprintf(b + bl, " ");
 895                 }
 896                 bl += sprintf(b + bl, "\n");
 897         }
 898         return bl;
 899 }
 900
 901 static void pscsi_bi_endio(struct bio *bio, int error)
 902 {
 903         bio_put(bio);
 904 }
 905
 906 static inline struct bio *pscsi_get_bio(int sg_num)
 907 {
 908         struct bio *bio;
 909         /*
 910          * Use bio_malloc() following the comment in for bio -> struct request
 911          * in block/blk-core.c:blk_make_request()
 912          */
 913         bio = bio_kmalloc(GFP_KERNEL, sg_num);
 914         if (!bio) {
 915                 pr_err("PSCSI: bio_kmalloc() failed\n");
 916                 return NULL;
 917         }
 918         bio->bi_end_io = pscsi_bi_endio;
 919
 920         return bio;
 921 }
 922
 923 static int pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl,
 924                 u32 sgl_nents, enum dma_data_direction data_direction,
 925                 struct bio **hbio)
 926 {
 927         struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
 928         struct bio *bio = NULL, *tbio = NULL;
 929         struct page *page;
 930         struct scatterlist *sg;
 931         u32 data_len = cmd->data_length, i, len, bytes, off;
 932         int nr_pages = (cmd->data_length + sgl[0].offset +
 933                         PAGE_SIZE - 1) >> PAGE_SHIFT;
 934         int nr_vecs = 0, rc;
 935         int rw = (data_direction == DMA_TO_DEVICE);
 936
 937         *hbio = NULL;
 938
 939         pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
 940
 941         for_each_sg(sgl, sg, sgl_nents, i) {
 942                 page = sg_page(sg);
 943                 off = sg->offset;
 944                 len = sg->length;
 945
 946                 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
 947                         page, len, off);
 948
 949                 while (len > 0 && data_len > 0) {
 950                         bytes = min_t(unsigned int, len, PAGE_SIZE - off);
 951                         bytes = min(bytes, data_len);
 952
 953                         if (!bio) {
 954                                 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
 955                                 nr_pages -= nr_vecs;
 956                                 /*
 957                                  * Calls bio_kmalloc() and sets bio->bi_end_io()
 958                                  */
 959                                 bio = pscsi_get_bio(nr_vecs);
 960                                 if (!bio)
 961                                         goto fail;
 962
 963                                 if (rw)
 964                                         bio->bi_rw |= REQ_WRITE;
 965
 966                                 pr_debug("PSCSI: Allocated bio: %p,"
 967                                         " dir: %s nr_vecs: %d\n", bio,
 968                                         (rw) ? "rw" : "r", nr_vecs);
 969                                 /*
 970                                  * Set *hbio pointer to handle the case:
 971                                  * nr_pages > BIO_MAX_PAGES, where additional
 972                                  * bios need to be added to complete a given
 973                                  * command.
 974                                  */
 975                                 if (!*hbio)
 976                                         *hbio = tbio = bio;
 977                                 else
 978                                         tbio = tbio->bi_next = bio;
 979                         }
 980
 981                         pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
 982                                 " bio: %p page: %p len: %d off: %d\n", i, bio,
 983                                 page, len, off);
 984
 985                         rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
 986                                         bio, page, bytes, off);
 987                         if (rc != bytes)
 988                                 goto fail;
 989
 990                         pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
 991                                 bio->bi_vcnt, nr_vecs);
 992
 993                         if (bio->bi_vcnt > nr_vecs) {
 994                                 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
 995                                         " %d i: %d bio: %p, allocating another"
 996                                         " bio\n", bio->bi_vcnt, i, bio);
 997                                 /*
 998                                  * Clear the pointer so that another bio will
 999                                  * be allocated with pscsi_get_bio() above, the
1000                                  * current bio has already been set *tbio and
1001                                  * bio->bi_next.
1002                                  */
1003                                 bio = NULL;
1004                         }
1005
1006                         page++;
1007                         len -= bytes;
1008                         data_len -= bytes;
1009                         off = 0;
1010                 }
1011         }
1012
1013         return sgl_nents;
1014 fail:
1015         while (*hbio) {
1016                 bio = *hbio;
1017                 *hbio = (*hbio)->bi_next;
1018                 bio->bi_next = NULL;
1019                 bio_endio(bio, 0);      /* XXX: should be error */
1020         }
1021         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1022         return -ENOMEM;
1023 }
1024
1025 static int pscsi_parse_cdb(struct se_cmd *cmd)
1026 {
1027         unsigned char *cdb = cmd->t_task_cdb;
1028         unsigned int dummy_size;
1029         int ret;
1030
1031         if (cmd->se_cmd_flags & SCF_BIDI) {
1032                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1033                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1034                 return -EINVAL;
1035         }
1036
1037         /*
1038          * For REPORT LUNS we always need to emulate the respone, and for everything
1039          * related to persistent reservations and ALUA we might optionally use our
1040          * handlers before passing on the command to the physical hardware.
1041          */
1042         switch (cdb[0]) {
1043         case REPORT_LUNS:
1044         case PERSISTENT_RESERVE_IN:
1045         case PERSISTENT_RESERVE_OUT:
1046         case RELEASE:
1047         case RELEASE_10:
1048         case RESERVE:
1049         case RESERVE_10:
1050                 ret = spc_parse_cdb(cmd, &dummy_size);
1051                 if (ret)
1052                         return ret;
1053                 break;
1054         case READ_6:
1055         case READ_10:
1056         case READ_12:
1057         case READ_16:
1058         case WRITE_6:
1059         case WRITE_10:
1060         case WRITE_12:
1061         case WRITE_16:
1062         case WRITE_VERIFY:
1063                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1064                 break;
1065         default:
1066                 break;
1067         }
1068
1069         return 0;
1070 }
1071
1072 static int pscsi_execute_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1073                 u32 sgl_nents, enum dma_data_direction data_direction)
1074 {
1075         struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
1076         struct pscsi_plugin_task *pt;
1077         struct request *req;
1078         struct bio *hbio;
1079         int ret;
1080
1081         /*
1082          * Dynamically alloc cdb space, since it may be larger than
1083          * TCM_MAX_COMMAND_SIZE
1084          */
1085         pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1086         if (!pt) {
1087                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1088                 return -ENOMEM;
1089         }
1090         cmd->priv = pt;
1091
1092         memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1093                 scsi_command_size(cmd->t_task_cdb));
1094
1095         if (!sgl) {
1096                 req = blk_get_request(pdv->pdv_sd->request_queue,
1097                                 (data_direction == DMA_TO_DEVICE),
1098                                 GFP_KERNEL);
1099                 if (!req || IS_ERR(req)) {
1100                         pr_err("PSCSI: blk_get_request() failed: %ld\n",
1101                                         req ? IS_ERR(req) : -ENOMEM);
1102                         cmd->scsi_sense_reason =
1103                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1104                         goto fail;
1105                 }
1106         } else {
1107                 BUG_ON(!cmd->data_length);
1108
1109                 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1110                 if (ret < 0) {
1111                         cmd->scsi_sense_reason =
1112                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1113                         goto fail;
1114                 }
1115
1116                 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1117                                        GFP_KERNEL);
1118                 if (IS_ERR(req)) {
1119                         pr_err("pSCSI: blk_make_request() failed\n");
1120                         goto fail_free_bio;
1121                 }
1122         }
1123
1124         req->cmd_type = REQ_TYPE_BLOCK_PC;
1125         req->end_io = pscsi_req_done;
1126         req->end_io_data = cmd;
1127         req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1128         req->cmd = &pt->pscsi_cdb[0];
1129         req->sense = &pt->pscsi_sense[0];
1130         req->sense_len = 0;
1131         if (pdv->pdv_sd->type == TYPE_DISK)
1132                 req->timeout = PS_TIMEOUT_DISK;
1133         else
1134                 req->timeout = PS_TIMEOUT_OTHER;
1135         req->retries = PS_RETRY;
1136
1137         blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1138                         (cmd->sam_task_attr == MSG_HEAD_TAG),
1139                         pscsi_req_done);
1140
1141         return 0;
1142
1143 fail_free_bio:
1144         while (hbio) {
1145                 struct bio *bio = hbio;
1146                 hbio = hbio->bi_next;
1147                 bio->bi_next = NULL;
1148                 bio_endio(bio, 0);      /* XXX: should be error */
1149         }
1150         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1151 fail:
1152         kfree(pt);
1153         return -ENOMEM;
1154 }
1155
1156 static unsigned char *pscsi_get_sense_buffer(struct se_cmd *cmd)
1157 {
1158         struct pscsi_plugin_task *pt = cmd->priv;
1159
1160         return pt->pscsi_sense;
1161 }
1162
1163 /*      pscsi_get_device_rev():
1164  *
1165  *
1166  */
1167 static u32 pscsi_get_device_rev(struct se_device *dev)
1168 {
1169         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1170         struct scsi_device *sd = pdv->pdv_sd;
1171
1172         return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1173 }
1174
1175 /*      pscsi_get_device_type():
1176  *
1177  *
1178  */
1179 static u32 pscsi_get_device_type(struct se_device *dev)
1180 {
1181         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1182         struct scsi_device *sd = pdv->pdv_sd;
1183
1184         return sd->type;
1185 }
1186
1187 static sector_t pscsi_get_blocks(struct se_device *dev)
1188 {
1189         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1190
1191         if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1192                 return pdv->pdv_bd->bd_part->nr_sects;
1193
1194         dump_stack();
1195         return 0;
1196 }
1197
1198 static void pscsi_req_done(struct request *req, int uptodate)
1199 {
1200         struct se_cmd *cmd = req->end_io_data;
1201         struct pscsi_plugin_task *pt = cmd->priv;
1202
1203         pt->pscsi_result = req->errors;
1204         pt->pscsi_resid = req->resid_len;
1205
1206         cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1207         if (cmd->scsi_status) {
1208                 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1209                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1210                         pt->pscsi_result);
1211         }
1212
1213         switch (host_byte(pt->pscsi_result)) {
1214         case DID_OK:
1215                 target_complete_cmd(cmd, cmd->scsi_status);
1216                 break;
1217         default:
1218                 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1219                         " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1220                         pt->pscsi_result);
1221                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1222                 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1223                 break;
1224         }
1225
1226         __blk_put_request(req->q, req);
1227         kfree(pt);
1228 }
1229
1230 static struct se_subsystem_api pscsi_template = {
1231         .name                   = "pscsi",
1232         .owner                  = THIS_MODULE,
1233         .transport_type         = TRANSPORT_PLUGIN_PHBA_PDEV,
1234         .attach_hba             = pscsi_attach_hba,
1235         .detach_hba             = pscsi_detach_hba,
1236         .pmode_enable_hba       = pscsi_pmode_enable_hba,
1237         .allocate_virtdevice    = pscsi_allocate_virtdevice,
1238         .create_virtdevice      = pscsi_create_virtdevice,
1239         .free_device            = pscsi_free_device,
1240         .transport_complete     = pscsi_transport_complete,
1241         .parse_cdb              = pscsi_parse_cdb,
1242         .execute_cmd            = pscsi_execute_cmd,
1243         .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1244         .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1245         .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1246         .get_sense_buffer       = pscsi_get_sense_buffer,
1247         .get_device_rev         = pscsi_get_device_rev,
1248         .get_device_type        = pscsi_get_device_type,
1249         .get_blocks             = pscsi_get_blocks,
1250 };
1251
1252 static int __init pscsi_module_init(void)
1253 {
1254         return transport_subsystem_register(&pscsi_template);
1255 }
1256
1257 static void pscsi_module_exit(void)
1258 {
1259         transport_subsystem_release(&pscsi_template);
1260 }
1261
1262 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1263 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1264 MODULE_LICENSE("GPL");
1265
1266 module_init(pscsi_module_init);
1267 module_exit(pscsi_module_exit);