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/file.h>
  39 #include <linux/module.h>
  40 #include <scsi/scsi.h>
  41 #include <scsi/scsi_device.h>
  42 #include <scsi/scsi_cmnd.h>
  43 #include <scsi/scsi_host.h>
  44 #include <scsi/scsi_tcq.h>
  45
  46 #include <target/target_core_base.h>
  47 #include <target/target_core_device.h>
  48 #include <target/target_core_transport.h>
  49
  50 #include "target_core_pscsi.h"
  51
  52 #define ISPRINT(a)  ((a >= ' ') && (a <= '~'))
  53
  54 static struct se_subsystem_api pscsi_template;
  55
  56 static void pscsi_req_done(struct request *, int);
  57
  58 /*      pscsi_attach_hba():
  59  *
  60  *      pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
  61  *      from the passed SCSI Host ID.
  62  */
  63 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
  64 {
  65         struct pscsi_hba_virt *phv;
  66
  67         phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
  68         if (!phv) {
  69                 pr_err("Unable to allocate struct pscsi_hba_virt\n");
  70                 return -ENOMEM;
  71         }
  72         phv->phv_host_id = host_id;
  73         phv->phv_mode = PHV_VIRUTAL_HOST_ID;
  74
  75         hba->hba_ptr = phv;
  76
  77         pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
  78                 " Generic Target Core Stack %s\n", hba->hba_id,
  79                 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
  80         pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
  81                hba->hba_id);
  82
  83         return 0;
  84 }
  85
  86 static void pscsi_detach_hba(struct se_hba *hba)
  87 {
  88         struct pscsi_hba_virt *phv = hba->hba_ptr;
  89         struct Scsi_Host *scsi_host = phv->phv_lld_host;
  90
  91         if (scsi_host) {
  92                 scsi_host_put(scsi_host);
  93
  94                 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
  95                         " Generic Target Core\n", hba->hba_id,
  96                         (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
  97                         "Unknown");
  98         } else
  99                 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
 100                         " from Generic Target Core\n", hba->hba_id);
 101
 102         kfree(phv);
 103         hba->hba_ptr = NULL;
 104 }
 105
 106 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
 107 {
 108         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
 109         struct Scsi_Host *sh = phv->phv_lld_host;
 110         /*
 111          * Release the struct Scsi_Host
 112          */
 113         if (!mode_flag) {
 114                 if (!sh)
 115                         return 0;
 116
 117                 phv->phv_lld_host = NULL;
 118                 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
 119
 120                 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
 121                         " %s\n", hba->hba_id, (sh->hostt->name) ?
 122                         (sh->hostt->name) : "Unknown");
 123
 124                 scsi_host_put(sh);
 125                 return 0;
 126         }
 127         /*
 128          * Otherwise, locate struct Scsi_Host from the original passed
 129          * pSCSI Host ID and enable for phba mode
 130          */
 131         sh = scsi_host_lookup(phv->phv_host_id);
 132         if (!sh) {
 133                 pr_err("pSCSI: Unable to locate SCSI Host for"
 134                         " phv_host_id: %d\n", phv->phv_host_id);
 135                 return -EINVAL;
 136         }
 137
 138         phv->phv_lld_host = sh;
 139         phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
 140
 141         pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
 142                 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
 143
 144         return 1;
 145 }
 146
 147 static void pscsi_tape_read_blocksize(struct se_device *dev,
 148                 struct scsi_device *sdev)
 149 {
 150         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 151         int ret;
 152
 153         buf = kzalloc(12, GFP_KERNEL);
 154         if (!buf)
 155                 return;
 156
 157         memset(cdb, 0, MAX_COMMAND_SIZE);
 158         cdb[0] = MODE_SENSE;
 159         cdb[4] = 0x0c; /* 12 bytes */
 160
 161         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
 162                         HZ, 1, NULL);
 163         if (ret)
 164                 goto out_free;
 165
 166         /*
 167          * If MODE_SENSE still returns zero, set the default value to 1024.
 168          */
 169         sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
 170         if (!sdev->sector_size)
 171                 sdev->sector_size = 1024;
 172 out_free:
 173         kfree(buf);
 174 }
 175
 176 static void
 177 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
 178 {
 179         unsigned char *buf;
 180
 181         if (sdev->inquiry_len < INQUIRY_LEN)
 182                 return;
 183
 184         buf = sdev->inquiry;
 185         if (!buf)
 186                 return;
 187         /*
 188          * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
 189          */
 190         memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
 191         memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
 192         memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
 193 }
 194
 195 static int
 196 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
 197 {
 198         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 199         int ret;
 200
 201         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 202         if (!buf)
 203                 return -ENOMEM;
 204
 205         memset(cdb, 0, MAX_COMMAND_SIZE);
 206         cdb[0] = INQUIRY;
 207         cdb[1] = 0x01; /* Query VPD */
 208         cdb[2] = 0x80; /* Unit Serial Number */
 209         cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
 210         cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
 211
 212         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 213                               INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
 214         if (ret)
 215                 goto out_free;
 216
 217         snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
 218
 219         wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
 220
 221         kfree(buf);
 222         return 0;
 223
 224 out_free:
 225         kfree(buf);
 226         return -EPERM;
 227 }
 228
 229 static void
 230 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
 231                 struct t10_wwn *wwn)
 232 {
 233         unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
 234         int ident_len, page_len, off = 4, ret;
 235         struct t10_vpd *vpd;
 236
 237         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 238         if (!buf)
 239                 return;
 240
 241         memset(cdb, 0, MAX_COMMAND_SIZE);
 242         cdb[0] = INQUIRY;
 243         cdb[1] = 0x01; /* Query VPD */
 244         cdb[2] = 0x83; /* Device Identifier */
 245         cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
 246         cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
 247
 248         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 249                               INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
 250                               NULL, HZ, 1, NULL);
 251         if (ret)
 252                 goto out;
 253
 254         page_len = (buf[2] << 8) | buf[3];
 255         while (page_len > 0) {
 256                 /* Grab a pointer to the Identification descriptor */
 257                 page_83 = &buf[off];
 258                 ident_len = page_83[3];
 259                 if (!ident_len) {
 260                         pr_err("page_83[3]: identifier"
 261                                         " length zero!\n");
 262                         break;
 263                 }
 264                 pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
 265
 266                 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
 267                 if (!vpd) {
 268                         pr_err("Unable to allocate memory for"
 269                                         " struct t10_vpd\n");
 270                         goto out;
 271                 }
 272                 INIT_LIST_HEAD(&vpd->vpd_list);
 273
 274                 transport_set_vpd_proto_id(vpd, page_83);
 275                 transport_set_vpd_assoc(vpd, page_83);
 276
 277                 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
 278                         off += (ident_len + 4);
 279                         page_len -= (ident_len + 4);
 280                         kfree(vpd);
 281                         continue;
 282                 }
 283                 if (transport_set_vpd_ident(vpd, page_83) < 0) {
 284                         off += (ident_len + 4);
 285                         page_len -= (ident_len + 4);
 286                         kfree(vpd);
 287                         continue;
 288                 }
 289
 290                 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
 291                 off += (ident_len + 4);
 292                 page_len -= (ident_len + 4);
 293         }
 294
 295 out:
 296         kfree(buf);
 297 }
 298
 299 /*      pscsi_add_device_to_list():
 300  *
 301  *
 302  */
 303 static struct se_device *pscsi_add_device_to_list(
 304         struct se_hba *hba,
 305         struct se_subsystem_dev *se_dev,
 306         struct pscsi_dev_virt *pdv,
 307         struct scsi_device *sd,
 308         int dev_flags)
 309 {
 310         struct se_device *dev;
 311         struct se_dev_limits dev_limits;
 312         struct request_queue *q;
 313         struct queue_limits *limits;
 314
 315         memset(&dev_limits, 0, sizeof(struct se_dev_limits));
 316
 317         if (!sd->queue_depth) {
 318                 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
 319
 320                 pr_err("Set broken SCSI Device %d:%d:%d"
 321                         " queue_depth to %d\n", sd->channel, sd->id,
 322                                 sd->lun, sd->queue_depth);
 323         }
 324         /*
 325          * Setup the local scope queue_limits from struct request_queue->limits
 326          * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
 327          */
 328         q = sd->request_queue;
 329         limits = &dev_limits.limits;
 330         limits->logical_block_size = sd->sector_size;
 331         limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
 332         limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
 333         dev_limits.hw_queue_depth = sd->queue_depth;
 334         dev_limits.queue_depth = sd->queue_depth;
 335         /*
 336          * Setup our standard INQUIRY info into se_dev->t10_wwn
 337          */
 338         pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
 339
 340         /*
 341          * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
 342          * which has already been referenced with Linux SCSI code with
 343          * scsi_device_get() in this file's pscsi_create_virtdevice().
 344          *
 345          * The passthrough operations called by the transport_add_device_*
 346          * function below will require this pointer to be set for passthroug
 347          *  ops.
 348          *
 349          * For the shutdown case in pscsi_free_device(), this struct
 350          * scsi_device  reference is released with Linux SCSI code
 351          * scsi_device_put() and the pdv->pdv_sd cleared.
 352          */
 353         pdv->pdv_sd = sd;
 354
 355         dev = transport_add_device_to_core_hba(hba, &pscsi_template,
 356                                 se_dev, dev_flags, pdv,
 357                                 &dev_limits, NULL, NULL);
 358         if (!dev) {
 359                 pdv->pdv_sd = NULL;
 360                 return NULL;
 361         }
 362
 363         /*
 364          * Locate VPD WWN Information used for various purposes within
 365          * the Storage Engine.
 366          */
 367         if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
 368                 /*
 369                  * If VPD Unit Serial returned GOOD status, try
 370                  * VPD Device Identification page (0x83).
 371                  */
 372                 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
 373         }
 374
 375         /*
 376          * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
 377          */
 378         if (sd->type == TYPE_TAPE)
 379                 pscsi_tape_read_blocksize(dev, sd);
 380         return dev;
 381 }
 382
 383 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
 384 {
 385         struct pscsi_dev_virt *pdv;
 386
 387         pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
 388         if (!pdv) {
 389                 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
 390                 return NULL;
 391         }
 392         pdv->pdv_se_hba = hba;
 393
 394         pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
 395         return pdv;
 396 }
 397
 398 /*
 399  * Called with struct Scsi_Host->host_lock called.
 400  */
 401 static struct se_device *pscsi_create_type_disk(
 402         struct scsi_device *sd,
 403         struct pscsi_dev_virt *pdv,
 404         struct se_subsystem_dev *se_dev,
 405         struct se_hba *hba)
 406         __releases(sh->host_lock)
 407 {
 408         struct se_device *dev;
 409         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
 410         struct Scsi_Host *sh = sd->host;
 411         struct block_device *bd;
 412         u32 dev_flags = 0;
 413
 414         if (scsi_device_get(sd)) {
 415                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 416                         sh->host_no, sd->channel, sd->id, sd->lun);
 417                 spin_unlock_irq(sh->host_lock);
 418                 return NULL;
 419         }
 420         spin_unlock_irq(sh->host_lock);
 421         /*
 422          * Claim exclusive struct block_device access to struct scsi_device
 423          * for TYPE_DISK using supplied udev_path
 424          */
 425         bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
 426                                 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
 427         if (IS_ERR(bd)) {
 428                 pr_err("pSCSI: blkdev_get_by_path() failed\n");
 429                 scsi_device_put(sd);
 430                 return NULL;
 431         }
 432         pdv->pdv_bd = bd;
 433
 434         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 435         if (!dev) {
 436                 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 437                 scsi_device_put(sd);
 438                 return NULL;
 439         }
 440         pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
 441                 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
 442
 443         return dev;
 444 }
 445
 446 /*
 447  * Called with struct Scsi_Host->host_lock called.
 448  */
 449 static struct se_device *pscsi_create_type_rom(
 450         struct scsi_device *sd,
 451         struct pscsi_dev_virt *pdv,
 452         struct se_subsystem_dev *se_dev,
 453         struct se_hba *hba)
 454         __releases(sh->host_lock)
 455 {
 456         struct se_device *dev;
 457         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
 458         struct Scsi_Host *sh = sd->host;
 459         u32 dev_flags = 0;
 460
 461         if (scsi_device_get(sd)) {
 462                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 463                         sh->host_no, sd->channel, sd->id, sd->lun);
 464                 spin_unlock_irq(sh->host_lock);
 465                 return NULL;
 466         }
 467         spin_unlock_irq(sh->host_lock);
 468
 469         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 470         if (!dev) {
 471                 scsi_device_put(sd);
 472                 return NULL;
 473         }
 474         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 475                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 476                 sd->channel, sd->id, sd->lun);
 477
 478         return dev;
 479 }
 480
 481 /*
 482  *Called with struct Scsi_Host->host_lock called.
 483  */
 484 static struct se_device *pscsi_create_type_other(
 485         struct scsi_device *sd,
 486         struct pscsi_dev_virt *pdv,
 487         struct se_subsystem_dev *se_dev,
 488         struct se_hba *hba)
 489         __releases(sh->host_lock)
 490 {
 491         struct se_device *dev;
 492         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
 493         struct Scsi_Host *sh = sd->host;
 494         u32 dev_flags = 0;
 495
 496         spin_unlock_irq(sh->host_lock);
 497         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 498         if (!dev)
 499                 return NULL;
 500
 501         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 502                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 503                 sd->channel, sd->id, sd->lun);
 504
 505         return dev;
 506 }
 507
 508 static struct se_device *pscsi_create_virtdevice(
 509         struct se_hba *hba,
 510         struct se_subsystem_dev *se_dev,
 511         void *p)
 512 {
 513         struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p;
 514         struct se_device *dev;
 515         struct scsi_device *sd;
 516         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
 517         struct Scsi_Host *sh = phv->phv_lld_host;
 518         int legacy_mode_enable = 0;
 519
 520         if (!pdv) {
 521                 pr_err("Unable to locate struct pscsi_dev_virt"
 522                                 " parameter\n");
 523                 return ERR_PTR(-EINVAL);
 524         }
 525         /*
 526          * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
 527          * struct Scsi_Host we will need to bring the TCM/pSCSI object online
 528          */
 529         if (!sh) {
 530                 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 531                         pr_err("pSCSI: Unable to locate struct"
 532                                 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
 533                         return ERR_PTR(-ENODEV);
 534                 }
 535                 /*
 536                  * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device
 537                  * reference, we enforce that udev_path has been set
 538                  */
 539                 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
 540                         pr_err("pSCSI: udev_path attribute has not"
 541                                 " been set before ENABLE=1\n");
 542                         return ERR_PTR(-EINVAL);
 543                 }
 544                 /*
 545                  * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID,
 546                  * use the original TCM hba ID to reference Linux/SCSI Host No
 547                  * and enable for PHV_LLD_SCSI_HOST_NO mode.
 548                  */
 549                 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
 550                         spin_lock(&hba->device_lock);
 551                         if (!list_empty(&hba->hba_dev_list)) {
 552                                 pr_err("pSCSI: Unable to set hba_mode"
 553                                         " with active devices\n");
 554                                 spin_unlock(&hba->device_lock);
 555                                 return ERR_PTR(-EEXIST);
 556                         }
 557                         spin_unlock(&hba->device_lock);
 558
 559                         if (pscsi_pmode_enable_hba(hba, 1) != 1)
 560                                 return ERR_PTR(-ENODEV);
 561
 562                         legacy_mode_enable = 1;
 563                         hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
 564                         sh = phv->phv_lld_host;
 565                 } else {
 566                         sh = scsi_host_lookup(pdv->pdv_host_id);
 567                         if (!sh) {
 568                                 pr_err("pSCSI: Unable to locate"
 569                                         " pdv_host_id: %d\n", pdv->pdv_host_id);
 570                                 return ERR_PTR(-EINVAL);
 571                         }
 572                         pdv->pdv_lld_host = sh;
 573                 }
 574         } else {
 575                 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) {
 576                         pr_err("pSCSI: PHV_VIRUTAL_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_VIRUTAL_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_VIRUTAL_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                 else if (pdv->pdv_lld_host)
 660                         scsi_host_put(pdv->pdv_lld_host);
 661
 662                 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
 663                         scsi_device_put(sd);
 664
 665                 pdv->pdv_sd = NULL;
 666         }
 667
 668         kfree(pdv);
 669 }
 670
 671 static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task)
 672 {
 673         return container_of(task, struct pscsi_plugin_task, pscsi_task);
 674 }
 675
 676
 677 /*      pscsi_transport_complete():
 678  *
 679  *
 680  */
 681 static int pscsi_transport_complete(struct se_task *task)
 682 {
 683         struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
 684         struct scsi_device *sd = pdv->pdv_sd;
 685         int result;
 686         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
 687         unsigned char *cdb = &pt->pscsi_cdb[0];
 688
 689         result = pt->pscsi_result;
 690         /*
 691          * Hack to make sure that Write-Protect modepage is set if R/O mode is
 692          * forced.
 693          */
 694         if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
 695              (status_byte(result) << 1) == SAM_STAT_GOOD) {
 696                 if (!task->task_se_cmd->se_deve)
 697                         goto after_mode_sense;
 698
 699                 if (task->task_se_cmd->se_deve->lun_flags &
 700                                 TRANSPORT_LUNFLAGS_READ_ONLY) {
 701                         unsigned char *buf = transport_kmap_data_sg(task->task_se_cmd);
 702
 703                         if (cdb[0] == MODE_SENSE_10) {
 704                                 if (!(buf[3] & 0x80))
 705                                         buf[3] |= 0x80;
 706                         } else {
 707                                 if (!(buf[2] & 0x80))
 708                                         buf[2] |= 0x80;
 709                         }
 710
 711                         transport_kunmap_data_sg(task->task_se_cmd);
 712                 }
 713         }
 714 after_mode_sense:
 715
 716         if (sd->type != TYPE_TAPE)
 717                 goto after_mode_select;
 718
 719         /*
 720          * Hack to correctly obtain the initiator requested blocksize for
 721          * TYPE_TAPE.  Since this value is dependent upon each tape media,
 722          * struct scsi_device->sector_size will not contain the correct value
 723          * by default, so we go ahead and set it so
 724          * TRANSPORT(dev)->get_blockdev() returns the correct value to the
 725          * storage engine.
 726          */
 727         if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
 728               (status_byte(result) << 1) == SAM_STAT_GOOD) {
 729                 unsigned char *buf;
 730                 struct scatterlist *sg = task->task_sg;
 731                 u16 bdl;
 732                 u32 blocksize;
 733
 734                 buf = sg_virt(&sg[0]);
 735                 if (!buf) {
 736                         pr_err("Unable to get buf for scatterlist\n");
 737                         goto after_mode_select;
 738                 }
 739
 740                 if (cdb[0] == MODE_SELECT)
 741                         bdl = (buf[3]);
 742                 else
 743                         bdl = (buf[6] << 8) | (buf[7]);
 744
 745                 if (!bdl)
 746                         goto after_mode_select;
 747
 748                 if (cdb[0] == MODE_SELECT)
 749                         blocksize = (buf[9] << 16) | (buf[10] << 8) |
 750                                         (buf[11]);
 751                 else
 752                         blocksize = (buf[13] << 16) | (buf[14] << 8) |
 753                                         (buf[15]);
 754
 755                 sd->sector_size = blocksize;
 756         }
 757 after_mode_select:
 758
 759         if (status_byte(result) & CHECK_CONDITION)
 760                 return 1;
 761
 762         return 0;
 763 }
 764
 765 static struct se_task *
 766 pscsi_alloc_task(unsigned char *cdb)
 767 {
 768         struct pscsi_plugin_task *pt;
 769
 770         /*
 771          * Dynamically alloc cdb space, since it may be larger than
 772          * TCM_MAX_COMMAND_SIZE
 773          */
 774         pt = kzalloc(sizeof(*pt) + scsi_command_size(cdb), GFP_KERNEL);
 775         if (!pt) {
 776                 pr_err("Unable to allocate struct pscsi_plugin_task\n");
 777                 return NULL;
 778         }
 779
 780         return &pt->pscsi_task;
 781 }
 782
 783 static void pscsi_free_task(struct se_task *task)
 784 {
 785         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
 786
 787         /*
 788          * We do not release the bio(s) here associated with this task, as
 789          * this is handled by bio_put() and pscsi_bi_endio().
 790          */
 791         kfree(pt);
 792 }
 793
 794 enum {
 795         Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
 796         Opt_scsi_lun_id, Opt_err
 797 };
 798
 799 static match_table_t tokens = {
 800         {Opt_scsi_host_id, "scsi_host_id=%d"},
 801         {Opt_scsi_channel_id, "scsi_channel_id=%d"},
 802         {Opt_scsi_target_id, "scsi_target_id=%d"},
 803         {Opt_scsi_lun_id, "scsi_lun_id=%d"},
 804         {Opt_err, NULL}
 805 };
 806
 807 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
 808         struct se_subsystem_dev *se_dev,
 809         const char *page,
 810         ssize_t count)
 811 {
 812         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 813         struct pscsi_hba_virt *phv = hba->hba_ptr;
 814         char *orig, *ptr, *opts;
 815         substring_t args[MAX_OPT_ARGS];
 816         int ret = 0, arg, token;
 817
 818         opts = kstrdup(page, GFP_KERNEL);
 819         if (!opts)
 820                 return -ENOMEM;
 821
 822         orig = opts;
 823
 824         while ((ptr = strsep(&opts, ",")) != NULL) {
 825                 if (!*ptr)
 826                         continue;
 827
 828                 token = match_token(ptr, tokens, args);
 829                 switch (token) {
 830                 case Opt_scsi_host_id:
 831                         if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 832                                 pr_err("PSCSI[%d]: Unable to accept"
 833                                         " scsi_host_id while phv_mode =="
 834                                         " PHV_LLD_SCSI_HOST_NO\n",
 835                                         phv->phv_host_id);
 836                                 ret = -EINVAL;
 837                                 goto out;
 838                         }
 839                         match_int(args, &arg);
 840                         pdv->pdv_host_id = arg;
 841                         pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
 842                                 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
 843                         pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
 844                         break;
 845                 case Opt_scsi_channel_id:
 846                         match_int(args, &arg);
 847                         pdv->pdv_channel_id = arg;
 848                         pr_debug("PSCSI[%d]: Referencing SCSI Channel"
 849                                 " ID: %d\n",  phv->phv_host_id,
 850                                 pdv->pdv_channel_id);
 851                         pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
 852                         break;
 853                 case Opt_scsi_target_id:
 854                         match_int(args, &arg);
 855                         pdv->pdv_target_id = arg;
 856                         pr_debug("PSCSI[%d]: Referencing SCSI Target"
 857                                 " ID: %d\n", phv->phv_host_id,
 858                                 pdv->pdv_target_id);
 859                         pdv->pdv_flags |= PDF_HAS_TARGET_ID;
 860                         break;
 861                 case Opt_scsi_lun_id:
 862                         match_int(args, &arg);
 863                         pdv->pdv_lun_id = arg;
 864                         pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
 865                                 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
 866                         pdv->pdv_flags |= PDF_HAS_LUN_ID;
 867                         break;
 868                 default:
 869                         break;
 870                 }
 871         }
 872
 873 out:
 874         kfree(orig);
 875         return (!ret) ? count : ret;
 876 }
 877
 878 static ssize_t pscsi_check_configfs_dev_params(
 879         struct se_hba *hba,
 880         struct se_subsystem_dev *se_dev)
 881 {
 882         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 883
 884         if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
 885             !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
 886             !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
 887                 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
 888                         " scsi_lun_id= parameters\n");
 889                 return -EINVAL;
 890         }
 891
 892         return 0;
 893 }
 894
 895 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
 896                                               struct se_subsystem_dev *se_dev,
 897                                               char *b)
 898 {
 899         struct pscsi_hba_virt *phv = hba->hba_ptr;
 900         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 901         struct scsi_device *sd = pdv->pdv_sd;
 902         unsigned char host_id[16];
 903         ssize_t bl;
 904         int i;
 905
 906         if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
 907                 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
 908         else
 909                 snprintf(host_id, 16, "PHBA Mode");
 910
 911         bl = sprintf(b, "SCSI Device Bus Location:"
 912                 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
 913                 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
 914                 host_id);
 915
 916         if (sd) {
 917                 bl += sprintf(b + bl, "        ");
 918                 bl += sprintf(b + bl, "Vendor: ");
 919                 for (i = 0; i < 8; i++) {
 920                         if (ISPRINT(sd->vendor[i]))   /* printable character? */
 921                                 bl += sprintf(b + bl, "%c", sd->vendor[i]);
 922                         else
 923                                 bl += sprintf(b + bl, " ");
 924                 }
 925                 bl += sprintf(b + bl, " Model: ");
 926                 for (i = 0; i < 16; i++) {
 927                         if (ISPRINT(sd->model[i]))   /* printable character ? */
 928                                 bl += sprintf(b + bl, "%c", sd->model[i]);
 929                         else
 930                                 bl += sprintf(b + bl, " ");
 931                 }
 932                 bl += sprintf(b + bl, " Rev: ");
 933                 for (i = 0; i < 4; i++) {
 934                         if (ISPRINT(sd->rev[i]))   /* printable character ? */
 935                                 bl += sprintf(b + bl, "%c", sd->rev[i]);
 936                         else
 937                                 bl += sprintf(b + bl, " ");
 938                 }
 939                 bl += sprintf(b + bl, "\n");
 940         }
 941         return bl;
 942 }
 943
 944 static void pscsi_bi_endio(struct bio *bio, int error)
 945 {
 946         bio_put(bio);
 947 }
 948
 949 static inline struct bio *pscsi_get_bio(int sg_num)
 950 {
 951         struct bio *bio;
 952         /*
 953          * Use bio_malloc() following the comment in for bio -> struct request
 954          * in block/blk-core.c:blk_make_request()
 955          */
 956         bio = bio_kmalloc(GFP_KERNEL, sg_num);
 957         if (!bio) {
 958                 pr_err("PSCSI: bio_kmalloc() failed\n");
 959                 return NULL;
 960         }
 961         bio->bi_end_io = pscsi_bi_endio;
 962
 963         return bio;
 964 }
 965
 966 static int pscsi_map_sg(struct se_task *task, struct scatterlist *task_sg,
 967                 struct bio **hbio)
 968 {
 969         struct se_cmd *cmd = task->task_se_cmd;
 970         struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
 971         u32 task_sg_num = task->task_sg_nents;
 972         struct bio *bio = NULL, *tbio = NULL;
 973         struct page *page;
 974         struct scatterlist *sg;
 975         u32 data_len = task->task_size, i, len, bytes, off;
 976         int nr_pages = (task->task_size + task_sg[0].offset +
 977                         PAGE_SIZE - 1) >> PAGE_SHIFT;
 978         int nr_vecs = 0, rc;
 979         int rw = (task->task_data_direction == DMA_TO_DEVICE);
 980
 981         *hbio = NULL;
 982
 983         pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
 984
 985         for_each_sg(task_sg, sg, task_sg_num, i) {
 986                 page = sg_page(sg);
 987                 off = sg->offset;
 988                 len = sg->length;
 989
 990                 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
 991                         page, len, off);
 992
 993                 while (len > 0 && data_len > 0) {
 994                         bytes = min_t(unsigned int, len, PAGE_SIZE - off);
 995                         bytes = min(bytes, data_len);
 996
 997                         if (!bio) {
 998                                 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
 999                                 nr_pages -= nr_vecs;
1000                                 /*
1001                                  * Calls bio_kmalloc() and sets bio->bi_end_io()
1002                                  */
1003                                 bio = pscsi_get_bio(nr_vecs);
1004                                 if (!bio)
1005                                         goto fail;
1006
1007                                 if (rw)
1008                                         bio->bi_rw |= REQ_WRITE;
1009
1010                                 pr_debug("PSCSI: Allocated bio: %p,"
1011                                         " dir: %s nr_vecs: %d\n", bio,
1012                                         (rw) ? "rw" : "r", nr_vecs);
1013                                 /*
1014                                  * Set *hbio pointer to handle the case:
1015                                  * nr_pages > BIO_MAX_PAGES, where additional
1016                                  * bios need to be added to complete a given
1017                                  * struct se_task
1018                                  */
1019                                 if (!*hbio)
1020                                         *hbio = tbio = bio;
1021                                 else
1022                                         tbio = tbio->bi_next = bio;
1023                         }
1024
1025                         pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
1026                                 " bio: %p page: %p len: %d off: %d\n", i, bio,
1027                                 page, len, off);
1028
1029                         rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
1030                                         bio, page, bytes, off);
1031                         if (rc != bytes)
1032                                 goto fail;
1033
1034                         pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1035                                 bio->bi_vcnt, nr_vecs);
1036
1037                         if (bio->bi_vcnt > nr_vecs) {
1038                                 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1039                                         " %d i: %d bio: %p, allocating another"
1040                                         " bio\n", bio->bi_vcnt, i, bio);
1041                                 /*
1042                                  * Clear the pointer so that another bio will
1043                                  * be allocated with pscsi_get_bio() above, the
1044                                  * current bio has already been set *tbio and
1045                                  * bio->bi_next.
1046                                  */
1047                                 bio = NULL;
1048                         }
1049
1050                         page++;
1051                         len -= bytes;
1052                         data_len -= bytes;
1053                         off = 0;
1054                 }
1055         }
1056
1057         return task->task_sg_nents;
1058 fail:
1059         while (*hbio) {
1060                 bio = *hbio;
1061                 *hbio = (*hbio)->bi_next;
1062                 bio->bi_next = NULL;
1063                 bio_endio(bio, 0);      /* XXX: should be error */
1064         }
1065         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1066         return -ENOMEM;
1067 }
1068
1069 static int pscsi_do_task(struct se_task *task)
1070 {
1071         struct se_cmd *cmd = task->task_se_cmd;
1072         struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
1073         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1074         struct request *req;
1075         struct bio *hbio;
1076         int ret;
1077
1078         target_get_task_cdb(task, pt->pscsi_cdb);
1079
1080         if (task->task_se_cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
1081                 req = blk_get_request(pdv->pdv_sd->request_queue,
1082                                 (task->task_data_direction == DMA_TO_DEVICE),
1083                                 GFP_KERNEL);
1084                 if (!req || IS_ERR(req)) {
1085                         pr_err("PSCSI: blk_get_request() failed: %ld\n",
1086                                         req ? IS_ERR(req) : -ENOMEM);
1087                         cmd->scsi_sense_reason =
1088                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1089                         return -ENODEV;
1090                 }
1091         } else {
1092                 BUG_ON(!task->task_size);
1093
1094                 /*
1095                  * Setup the main struct request for the task->task_sg[] payload
1096                  */
1097                 ret = pscsi_map_sg(task, task->task_sg, &hbio);
1098                 if (ret < 0) {
1099                         cmd->scsi_sense_reason =
1100                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1101                         return ret;
1102                 }
1103
1104                 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1105                                        GFP_KERNEL);
1106                 if (IS_ERR(req)) {
1107                         pr_err("pSCSI: blk_make_request() failed\n");
1108                         goto fail;
1109                 }
1110         }
1111
1112         req->cmd_type = REQ_TYPE_BLOCK_PC;
1113         req->end_io = pscsi_req_done;
1114         req->end_io_data = task;
1115         req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1116         req->cmd = &pt->pscsi_cdb[0];
1117         req->sense = &pt->pscsi_sense[0];
1118         req->sense_len = 0;
1119         if (pdv->pdv_sd->type == TYPE_DISK)
1120                 req->timeout = PS_TIMEOUT_DISK;
1121         else
1122                 req->timeout = PS_TIMEOUT_OTHER;
1123         req->retries = PS_RETRY;
1124
1125         blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1126                         (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG),
1127                         pscsi_req_done);
1128
1129         return 0;
1130
1131 fail:
1132         while (hbio) {
1133                 struct bio *bio = hbio;
1134                 hbio = hbio->bi_next;
1135                 bio->bi_next = NULL;
1136                 bio_endio(bio, 0);      /* XXX: should be error */
1137         }
1138         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1139         return -ENOMEM;
1140 }
1141
1142 /*      pscsi_get_sense_buffer():
1143  *
1144  *
1145  */
1146 static unsigned char *pscsi_get_sense_buffer(struct se_task *task)
1147 {
1148         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1149
1150         return (unsigned char *)&pt->pscsi_sense[0];
1151 }
1152
1153 /*      pscsi_get_device_rev():
1154  *
1155  *
1156  */
1157 static u32 pscsi_get_device_rev(struct se_device *dev)
1158 {
1159         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1160         struct scsi_device *sd = pdv->pdv_sd;
1161
1162         return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1163 }
1164
1165 /*      pscsi_get_device_type():
1166  *
1167  *
1168  */
1169 static u32 pscsi_get_device_type(struct se_device *dev)
1170 {
1171         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1172         struct scsi_device *sd = pdv->pdv_sd;
1173
1174         return (sd) ? sd->type : TYPE_NO_LUN;
1175 }
1176
1177 static sector_t pscsi_get_blocks(struct se_device *dev)
1178 {
1179         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1180
1181         if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1182                 return pdv->pdv_bd->bd_part->nr_sects;
1183
1184         dump_stack();
1185         return 0;
1186 }
1187
1188 /*      pscsi_handle_SAM_STATUS_failures():
1189  *
1190  *
1191  */
1192 static inline void pscsi_process_SAM_status(
1193         struct se_task *task,
1194         struct pscsi_plugin_task *pt)
1195 {
1196         task->task_scsi_status = status_byte(pt->pscsi_result);
1197         if (task->task_scsi_status) {
1198                 task->task_scsi_status <<= 1;
1199                 pr_debug("PSCSI Status Byte exception at task: %p CDB:"
1200                         " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1201                         pt->pscsi_result);
1202         }
1203
1204         switch (host_byte(pt->pscsi_result)) {
1205         case DID_OK:
1206                 transport_complete_task(task, (!task->task_scsi_status));
1207                 break;
1208         default:
1209                 pr_debug("PSCSI Host Byte exception at task: %p CDB:"
1210                         " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1211                         pt->pscsi_result);
1212                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
1213                 task->task_se_cmd->scsi_sense_reason =
1214                                         TCM_UNSUPPORTED_SCSI_OPCODE;
1215                 transport_complete_task(task, 0);
1216                 break;
1217         }
1218 }
1219
1220 static void pscsi_req_done(struct request *req, int uptodate)
1221 {
1222         struct se_task *task = req->end_io_data;
1223         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1224
1225         pt->pscsi_result = req->errors;
1226         pt->pscsi_resid = req->resid_len;
1227
1228         pscsi_process_SAM_status(task, pt);
1229         __blk_put_request(req->q, req);
1230 }
1231
1232 static struct se_subsystem_api pscsi_template = {
1233         .name                   = "pscsi",
1234         .owner                  = THIS_MODULE,
1235         .transport_type         = TRANSPORT_PLUGIN_PHBA_PDEV,
1236         .attach_hba             = pscsi_attach_hba,
1237         .detach_hba             = pscsi_detach_hba,
1238         .pmode_enable_hba       = pscsi_pmode_enable_hba,
1239         .allocate_virtdevice    = pscsi_allocate_virtdevice,
1240         .create_virtdevice      = pscsi_create_virtdevice,
1241         .free_device            = pscsi_free_device,
1242         .transport_complete     = pscsi_transport_complete,
1243         .alloc_task             = pscsi_alloc_task,
1244         .do_task                = pscsi_do_task,
1245         .free_task              = pscsi_free_task,
1246         .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1247         .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1248         .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1249         .get_sense_buffer       = pscsi_get_sense_buffer,
1250         .get_device_rev         = pscsi_get_device_rev,
1251         .get_device_type        = pscsi_get_device_type,
1252         .get_blocks             = pscsi_get_blocks,
1253 };
1254
1255 static int __init pscsi_module_init(void)
1256 {
1257         return transport_subsystem_register(&pscsi_template);
1258 }
1259
1260 static void pscsi_module_exit(void)
1261 {
1262         transport_subsystem_release(&pscsi_template);
1263 }
1264
1265 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1266 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1267 MODULE_LICENSE("GPL");
1268
1269 module_init(pscsi_module_init);
1270 module_exit(pscsi_module_exit);