linux/drivers/target/target_core_pscsi.c
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   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
  56static struct se_subsystem_api pscsi_template;
  57
  58static int pscsi_execute_cmd(struct se_cmd *cmd);
  59static void pscsi_req_done(struct request *, int);
  60
  61/*      pscsi_attach_hba():
  62 *
  63 *      pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
  64 *      from the passed SCSI Host ID.
  65 */
  66static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
  67{
  68        struct pscsi_hba_virt *phv;
  69
  70        phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
  71        if (!phv) {
  72                pr_err("Unable to allocate struct pscsi_hba_virt\n");
  73                return -ENOMEM;
  74        }
  75        phv->phv_host_id = host_id;
  76        phv->phv_mode = PHV_VIRTUAL_HOST_ID;
  77
  78        hba->hba_ptr = phv;
  79
  80        pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
  81                " Generic Target Core Stack %s\n", hba->hba_id,
  82                PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
  83        pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
  84               hba->hba_id);
  85
  86        return 0;
  87}
  88
  89static void pscsi_detach_hba(struct se_hba *hba)
  90{
  91        struct pscsi_hba_virt *phv = hba->hba_ptr;
  92        struct Scsi_Host *scsi_host = phv->phv_lld_host;
  93
  94        if (scsi_host) {
  95                scsi_host_put(scsi_host);
  96
  97                pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
  98                        " Generic Target Core\n", hba->hba_id,
  99                        (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
 100                        "Unknown");
 101        } else
 102                pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
 103                        " from Generic Target Core\n", hba->hba_id);
 104
 105        kfree(phv);
 106        hba->hba_ptr = NULL;
 107}
 108
 109static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
 110{
 111        struct pscsi_hba_virt *phv = hba->hba_ptr;
 112        struct Scsi_Host *sh = phv->phv_lld_host;
 113        /*
 114         * Release the struct Scsi_Host
 115         */
 116        if (!mode_flag) {
 117                if (!sh)
 118                        return 0;
 119
 120                phv->phv_lld_host = NULL;
 121                phv->phv_mode = PHV_VIRTUAL_HOST_ID;
 122
 123                pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
 124                        " %s\n", hba->hba_id, (sh->hostt->name) ?
 125                        (sh->hostt->name) : "Unknown");
 126
 127                scsi_host_put(sh);
 128                return 0;
 129        }
 130        /*
 131         * Otherwise, locate struct Scsi_Host from the original passed
 132         * pSCSI Host ID and enable for phba mode
 133         */
 134        sh = scsi_host_lookup(phv->phv_host_id);
 135        if (IS_ERR(sh)) {
 136                pr_err("pSCSI: Unable to locate SCSI Host for"
 137                        " phv_host_id: %d\n", phv->phv_host_id);
 138                return PTR_ERR(sh);
 139        }
 140
 141        phv->phv_lld_host = sh;
 142        phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
 143
 144        pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
 145                hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
 146
 147        return 1;
 148}
 149
 150static void pscsi_tape_read_blocksize(struct se_device *dev,
 151                struct scsi_device *sdev)
 152{
 153        unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 154        int ret;
 155
 156        buf = kzalloc(12, GFP_KERNEL);
 157        if (!buf)
 158                return;
 159
 160        memset(cdb, 0, MAX_COMMAND_SIZE);
 161        cdb[0] = MODE_SENSE;
 162        cdb[4] = 0x0c; /* 12 bytes */
 163
 164        ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
 165                        HZ, 1, NULL);
 166        if (ret)
 167                goto out_free;
 168
 169        /*
 170         * If MODE_SENSE still returns zero, set the default value to 1024.
 171         */
 172        sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
 173        if (!sdev->sector_size)
 174                sdev->sector_size = 1024;
 175out_free:
 176        kfree(buf);
 177}
 178
 179static void
 180pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
 181{
 182        unsigned char *buf;
 183
 184        if (sdev->inquiry_len < INQUIRY_LEN)
 185                return;
 186
 187        buf = sdev->inquiry;
 188        if (!buf)
 189                return;
 190        /*
 191         * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
 192         */
 193        memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
 194        memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
 195        memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
 196}
 197
 198static int
 199pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
 200{
 201        unsigned char cdb[MAX_COMMAND_SIZE], *buf;
 202        int ret;
 203
 204        buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 205        if (!buf)
 206                return -ENOMEM;
 207
 208        memset(cdb, 0, MAX_COMMAND_SIZE);
 209        cdb[0] = INQUIRY;
 210        cdb[1] = 0x01; /* Query VPD */
 211        cdb[2] = 0x80; /* Unit Serial Number */
 212        cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
 213        cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
 214
 215        ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 216                              INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
 217        if (ret)
 218                goto out_free;
 219
 220        snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
 221
 222        wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
 223
 224        kfree(buf);
 225        return 0;
 226
 227out_free:
 228        kfree(buf);
 229        return -EPERM;
 230}
 231
 232static void
 233pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
 234                struct t10_wwn *wwn)
 235{
 236        unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
 237        int ident_len, page_len, off = 4, ret;
 238        struct t10_vpd *vpd;
 239
 240        buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
 241        if (!buf)
 242                return;
 243
 244        memset(cdb, 0, MAX_COMMAND_SIZE);
 245        cdb[0] = INQUIRY;
 246        cdb[1] = 0x01; /* Query VPD */
 247        cdb[2] = 0x83; /* Device Identifier */
 248        cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
 249        cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
 250
 251        ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 252                              INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
 253                              NULL, HZ, 1, NULL);
 254        if (ret)
 255                goto out;
 256
 257        page_len = (buf[2] << 8) | buf[3];
 258        while (page_len > 0) {
 259                /* Grab a pointer to the Identification descriptor */
 260                page_83 = &buf[off];
 261                ident_len = page_83[3];
 262                if (!ident_len) {
 263                        pr_err("page_83[3]: identifier"
 264                                        " length zero!\n");
 265                        break;
 266                }
 267                pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
 268
 269                vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
 270                if (!vpd) {
 271                        pr_err("Unable to allocate memory for"
 272                                        " struct t10_vpd\n");
 273                        goto out;
 274                }
 275                INIT_LIST_HEAD(&vpd->vpd_list);
 276
 277                transport_set_vpd_proto_id(vpd, page_83);
 278                transport_set_vpd_assoc(vpd, page_83);
 279
 280                if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
 281                        off += (ident_len + 4);
 282                        page_len -= (ident_len + 4);
 283                        kfree(vpd);
 284                        continue;
 285                }
 286                if (transport_set_vpd_ident(vpd, page_83) < 0) {
 287                        off += (ident_len + 4);
 288                        page_len -= (ident_len + 4);
 289                        kfree(vpd);
 290                        continue;
 291                }
 292
 293                list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
 294                off += (ident_len + 4);
 295                page_len -= (ident_len + 4);
 296        }
 297
 298out:
 299        kfree(buf);
 300}
 301
 302/*      pscsi_add_device_to_list():
 303 *
 304 *
 305 */
 306static struct se_device *pscsi_add_device_to_list(
 307        struct se_hba *hba,
 308        struct se_subsystem_dev *se_dev,
 309        struct pscsi_dev_virt *pdv,
 310        struct scsi_device *sd,
 311        int dev_flags)
 312{
 313        struct se_device *dev;
 314        struct se_dev_limits dev_limits;
 315        struct request_queue *q;
 316        struct queue_limits *limits;
 317
 318        memset(&dev_limits, 0, sizeof(struct se_dev_limits));
 319
 320        if (!sd->queue_depth) {
 321                sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
 322
 323                pr_err("Set broken SCSI Device %d:%d:%d"
 324                        " queue_depth to %d\n", sd->channel, sd->id,
 325                                sd->lun, sd->queue_depth);
 326        }
 327        /*
 328         * Setup the local scope queue_limits from struct request_queue->limits
 329         * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
 330         */
 331        q = sd->request_queue;
 332        limits = &dev_limits.limits;
 333        limits->logical_block_size = sd->sector_size;
 334        limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
 335        limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
 336        dev_limits.hw_queue_depth = sd->queue_depth;
 337        dev_limits.queue_depth = sd->queue_depth;
 338        /*
 339         * Setup our standard INQUIRY info into se_dev->t10_wwn
 340         */
 341        pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
 342
 343        /*
 344         * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
 345         * which has already been referenced with Linux SCSI code with
 346         * scsi_device_get() in this file's pscsi_create_virtdevice().
 347         *
 348         * The passthrough operations called by the transport_add_device_*
 349         * function below will require this pointer to be set for passthroug
 350         *  ops.
 351         *
 352         * For the shutdown case in pscsi_free_device(), this struct
 353         * scsi_device  reference is released with Linux SCSI code
 354         * scsi_device_put() and the pdv->pdv_sd cleared.
 355         */
 356        pdv->pdv_sd = sd;
 357        dev = transport_add_device_to_core_hba(hba, &pscsi_template,
 358                                se_dev, dev_flags, pdv,
 359                                &dev_limits, NULL, NULL);
 360        if (!dev) {
 361                pdv->pdv_sd = NULL;
 362                return NULL;
 363        }
 364
 365        /*
 366         * Locate VPD WWN Information used for various purposes within
 367         * the Storage Engine.
 368         */
 369        if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
 370                /*
 371                 * If VPD Unit Serial returned GOOD status, try
 372                 * VPD Device Identification page (0x83).
 373                 */
 374                pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
 375        }
 376
 377        /*
 378         * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
 379         */
 380        if (sd->type == TYPE_TAPE)
 381                pscsi_tape_read_blocksize(dev, sd);
 382        return dev;
 383}
 384
 385static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
 386{
 387        struct pscsi_dev_virt *pdv;
 388
 389        pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
 390        if (!pdv) {
 391                pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
 392                return NULL;
 393        }
 394        pdv->pdv_se_hba = hba;
 395
 396        pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
 397        return pdv;
 398}
 399
 400/*
 401 * Called with struct Scsi_Host->host_lock called.
 402 */
 403static struct se_device *pscsi_create_type_disk(
 404        struct scsi_device *sd,
 405        struct pscsi_dev_virt *pdv,
 406        struct se_subsystem_dev *se_dev,
 407        struct se_hba *hba)
 408        __releases(sh->host_lock)
 409{
 410        struct se_device *dev;
 411        struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 412        struct Scsi_Host *sh = sd->host;
 413        struct block_device *bd;
 414        u32 dev_flags = 0;
 415
 416        if (scsi_device_get(sd)) {
 417                pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 418                        sh->host_no, sd->channel, sd->id, sd->lun);
 419                spin_unlock_irq(sh->host_lock);
 420                return NULL;
 421        }
 422        spin_unlock_irq(sh->host_lock);
 423        /*
 424         * Claim exclusive struct block_device access to struct scsi_device
 425         * for TYPE_DISK using supplied udev_path
 426         */
 427        bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
 428                                FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
 429        if (IS_ERR(bd)) {
 430                pr_err("pSCSI: blkdev_get_by_path() failed\n");
 431                scsi_device_put(sd);
 432                return NULL;
 433        }
 434        pdv->pdv_bd = bd;
 435
 436        dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 437        if (!dev) {
 438                blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 439                scsi_device_put(sd);
 440                return NULL;
 441        }
 442        pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
 443                phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
 444
 445        return dev;
 446}
 447
 448/*
 449 * Called with struct Scsi_Host->host_lock called.
 450 */
 451static struct se_device *pscsi_create_type_rom(
 452        struct scsi_device *sd,
 453        struct pscsi_dev_virt *pdv,
 454        struct se_subsystem_dev *se_dev,
 455        struct se_hba *hba)
 456        __releases(sh->host_lock)
 457{
 458        struct se_device *dev;
 459        struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 460        struct Scsi_Host *sh = sd->host;
 461        u32 dev_flags = 0;
 462
 463        if (scsi_device_get(sd)) {
 464                pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
 465                        sh->host_no, sd->channel, sd->id, sd->lun);
 466                spin_unlock_irq(sh->host_lock);
 467                return NULL;
 468        }
 469        spin_unlock_irq(sh->host_lock);
 470
 471        dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 472        if (!dev) {
 473                scsi_device_put(sd);
 474                return NULL;
 475        }
 476        pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 477                phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 478                sd->channel, sd->id, sd->lun);
 479
 480        return dev;
 481}
 482
 483/*
 484 *Called with struct Scsi_Host->host_lock called.
 485 */
 486static struct se_device *pscsi_create_type_other(
 487        struct scsi_device *sd,
 488        struct pscsi_dev_virt *pdv,
 489        struct se_subsystem_dev *se_dev,
 490        struct se_hba *hba)
 491        __releases(sh->host_lock)
 492{
 493        struct se_device *dev;
 494        struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 495        struct Scsi_Host *sh = sd->host;
 496        u32 dev_flags = 0;
 497
 498        spin_unlock_irq(sh->host_lock);
 499        dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
 500        if (!dev)
 501                return NULL;
 502
 503        pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
 504                phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
 505                sd->channel, sd->id, sd->lun);
 506
 507        return dev;
 508}
 509
 510static struct se_device *pscsi_create_virtdevice(
 511        struct se_hba *hba,
 512        struct se_subsystem_dev *se_dev,
 513        void *p)
 514{
 515        struct pscsi_dev_virt *pdv = p;
 516        struct se_device *dev;
 517        struct scsi_device *sd;
 518        struct pscsi_hba_virt *phv = hba->hba_ptr;
 519        struct Scsi_Host *sh = phv->phv_lld_host;
 520        int legacy_mode_enable = 0;
 521
 522        if (!pdv) {
 523                pr_err("Unable to locate struct pscsi_dev_virt"
 524                                " parameter\n");
 525                return ERR_PTR(-EINVAL);
 526        }
 527        /*
 528         * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
 529         * struct Scsi_Host we will need to bring the TCM/pSCSI object online
 530         */
 531        if (!sh) {
 532                if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 533                        pr_err("pSCSI: Unable to locate struct"
 534                                " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
 535                        return ERR_PTR(-ENODEV);
 536                }
 537                /*
 538                 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
 539                 * reference, we enforce that udev_path has been set
 540                 */
 541                if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
 542                        pr_err("pSCSI: udev_path attribute has not"
 543                                " been set before ENABLE=1\n");
 544                        return ERR_PTR(-EINVAL);
 545                }
 546                /*
 547                 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
 548                 * use the original TCM hba ID to reference Linux/SCSI Host No
 549                 * and enable for PHV_LLD_SCSI_HOST_NO mode.
 550                 */
 551                if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
 552                        spin_lock(&hba->device_lock);
 553                        if (!list_empty(&hba->hba_dev_list)) {
 554                                pr_err("pSCSI: Unable to set hba_mode"
 555                                        " with active devices\n");
 556                                spin_unlock(&hba->device_lock);
 557                                return ERR_PTR(-EEXIST);
 558                        }
 559                        spin_unlock(&hba->device_lock);
 560
 561                        if (pscsi_pmode_enable_hba(hba, 1) != 1)
 562                                return ERR_PTR(-ENODEV);
 563
 564                        legacy_mode_enable = 1;
 565                        hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
 566                        sh = phv->phv_lld_host;
 567                } else {
 568                        sh = scsi_host_lookup(pdv->pdv_host_id);
 569                        if (IS_ERR(sh)) {
 570                                pr_err("pSCSI: Unable to locate"
 571                                        " pdv_host_id: %d\n", pdv->pdv_host_id);
 572                                return ERR_CAST(sh);
 573                        }
 574                }
 575        } else {
 576                if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
 577                        pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
 578                                " struct Scsi_Host exists\n");
 579                        return ERR_PTR(-EEXIST);
 580                }
 581        }
 582
 583        spin_lock_irq(sh->host_lock);
 584        list_for_each_entry(sd, &sh->__devices, siblings) {
 585                if ((pdv->pdv_channel_id != sd->channel) ||
 586                    (pdv->pdv_target_id != sd->id) ||
 587                    (pdv->pdv_lun_id != sd->lun))
 588                        continue;
 589                /*
 590                 * Functions will release the held struct scsi_host->host_lock
 591                 * before calling calling pscsi_add_device_to_list() to register
 592                 * struct scsi_device with target_core_mod.
 593                 */
 594                switch (sd->type) {
 595                case TYPE_DISK:
 596                        dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
 597                        break;
 598                case TYPE_ROM:
 599                        dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
 600                        break;
 601                default:
 602                        dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
 603                        break;
 604                }
 605
 606                if (!dev) {
 607                        if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 608                                scsi_host_put(sh);
 609                        else if (legacy_mode_enable) {
 610                                pscsi_pmode_enable_hba(hba, 0);
 611                                hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 612                        }
 613                        pdv->pdv_sd = NULL;
 614                        return ERR_PTR(-ENODEV);
 615                }
 616                return dev;
 617        }
 618        spin_unlock_irq(sh->host_lock);
 619
 620        pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
 621                pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);
 622
 623        if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 624                scsi_host_put(sh);
 625        else if (legacy_mode_enable) {
 626                pscsi_pmode_enable_hba(hba, 0);
 627                hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
 628        }
 629
 630        return ERR_PTR(-ENODEV);
 631}
 632
 633/*      pscsi_free_device(): (Part of se_subsystem_api_t template)
 634 *
 635 *
 636 */
 637static void pscsi_free_device(void *p)
 638{
 639        struct pscsi_dev_virt *pdv = p;
 640        struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
 641        struct scsi_device *sd = pdv->pdv_sd;
 642
 643        if (sd) {
 644                /*
 645                 * Release exclusive pSCSI internal struct block_device claim for
 646                 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
 647                 */
 648                if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
 649                        blkdev_put(pdv->pdv_bd,
 650                                   FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 651                        pdv->pdv_bd = NULL;
 652                }
 653                /*
 654                 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
 655                 * to struct Scsi_Host now.
 656                 */
 657                if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
 658                    (phv->phv_lld_host != NULL))
 659                        scsi_host_put(phv->phv_lld_host);
 660
 661                if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
 662                        scsi_device_put(sd);
 663
 664                pdv->pdv_sd = NULL;
 665        }
 666
 667        kfree(pdv);
 668}
 669
 670static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
 671                                     unsigned char *sense_buffer)
 672{
 673        struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
 674        struct scsi_device *sd = pdv->pdv_sd;
 675        int result;
 676        struct pscsi_plugin_task *pt = cmd->priv;
 677        unsigned char *cdb;
 678        /*
 679         * Special case for REPORT_LUNs handling where pscsi_plugin_task has
 680         * not been allocated because TCM is handling the emulation directly.
 681         */
 682        if (!pt)
 683                return;
 684
 685        cdb = &pt->pscsi_cdb[0];
 686        result = pt->pscsi_result;
 687        /*
 688         * Hack to make sure that Write-Protect modepage is set if R/O mode is
 689         * forced.
 690         */
 691        if (!cmd->se_deve || !cmd->data_length)
 692                goto after_mode_sense;
 693
 694        if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
 695             (status_byte(result) << 1) == SAM_STAT_GOOD) {
 696                if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
 697                        unsigned char *buf = transport_kmap_data_sg(cmd);
 698
 699                        if (cdb[0] == MODE_SENSE_10) {
 700                                if (!(buf[3] & 0x80))
 701                                        buf[3] |= 0x80;
 702                        } else {
 703                                if (!(buf[2] & 0x80))
 704                                        buf[2] |= 0x80;
 705                        }
 706
 707                        transport_kunmap_data_sg(cmd);
 708                }
 709        }
 710after_mode_sense:
 711
 712        if (sd->type != TYPE_TAPE || !cmd->data_length)
 713                goto after_mode_select;
 714
 715        /*
 716         * Hack to correctly obtain the initiator requested blocksize for
 717         * TYPE_TAPE.  Since this value is dependent upon each tape media,
 718         * struct scsi_device->sector_size will not contain the correct value
 719         * by default, so we go ahead and set it so
 720         * TRANSPORT(dev)->get_blockdev() returns the correct value to the
 721         * storage engine.
 722         */
 723        if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
 724              (status_byte(result) << 1) == SAM_STAT_GOOD) {
 725                unsigned char *buf;
 726                u16 bdl;
 727                u32 blocksize;
 728
 729                buf = sg_virt(&sg[0]);
 730                if (!buf) {
 731                        pr_err("Unable to get buf for scatterlist\n");
 732                        goto after_mode_select;
 733                }
 734
 735                if (cdb[0] == MODE_SELECT)
 736                        bdl = (buf[3]);
 737                else
 738                        bdl = (buf[6] << 8) | (buf[7]);
 739
 740                if (!bdl)
 741                        goto after_mode_select;
 742
 743                if (cdb[0] == MODE_SELECT)
 744                        blocksize = (buf[9] << 16) | (buf[10] << 8) |
 745                                        (buf[11]);
 746                else
 747                        blocksize = (buf[13] << 16) | (buf[14] << 8) |
 748                                        (buf[15]);
 749
 750                sd->sector_size = blocksize;
 751        }
 752after_mode_select:
 753
 754        if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
 755                memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
 756                cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 757        }
 758}
 759
 760enum {
 761        Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
 762        Opt_scsi_lun_id, Opt_err
 763};
 764
 765static match_table_t tokens = {
 766        {Opt_scsi_host_id, "scsi_host_id=%d"},
 767        {Opt_scsi_channel_id, "scsi_channel_id=%d"},
 768        {Opt_scsi_target_id, "scsi_target_id=%d"},
 769        {Opt_scsi_lun_id, "scsi_lun_id=%d"},
 770        {Opt_err, NULL}
 771};
 772
 773static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
 774        struct se_subsystem_dev *se_dev,
 775        const char *page,
 776        ssize_t count)
 777{
 778        struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 779        struct pscsi_hba_virt *phv = hba->hba_ptr;
 780        char *orig, *ptr, *opts;
 781        substring_t args[MAX_OPT_ARGS];
 782        int ret = 0, arg, token;
 783
 784        opts = kstrdup(page, GFP_KERNEL);
 785        if (!opts)
 786                return -ENOMEM;
 787
 788        orig = opts;
 789
 790        while ((ptr = strsep(&opts, ",\n")) != NULL) {
 791                if (!*ptr)
 792                        continue;
 793
 794                token = match_token(ptr, tokens, args);
 795                switch (token) {
 796                case Opt_scsi_host_id:
 797                        if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
 798                                pr_err("PSCSI[%d]: Unable to accept"
 799                                        " scsi_host_id while phv_mode =="
 800                                        " PHV_LLD_SCSI_HOST_NO\n",
 801                                        phv->phv_host_id);
 802                                ret = -EINVAL;
 803                                goto out;
 804                        }
 805                        match_int(args, &arg);
 806                        pdv->pdv_host_id = arg;
 807                        pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
 808                                " %d\n", phv->phv_host_id, pdv->pdv_host_id);
 809                        pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
 810                        break;
 811                case Opt_scsi_channel_id:
 812                        match_int(args, &arg);
 813                        pdv->pdv_channel_id = arg;
 814                        pr_debug("PSCSI[%d]: Referencing SCSI Channel"
 815                                " ID: %d\n",  phv->phv_host_id,
 816                                pdv->pdv_channel_id);
 817                        pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
 818                        break;
 819                case Opt_scsi_target_id:
 820                        match_int(args, &arg);
 821                        pdv->pdv_target_id = arg;
 822                        pr_debug("PSCSI[%d]: Referencing SCSI Target"
 823                                " ID: %d\n", phv->phv_host_id,
 824                                pdv->pdv_target_id);
 825                        pdv->pdv_flags |= PDF_HAS_TARGET_ID;
 826                        break;
 827                case Opt_scsi_lun_id:
 828                        match_int(args, &arg);
 829                        pdv->pdv_lun_id = arg;
 830                        pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
 831                                " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
 832                        pdv->pdv_flags |= PDF_HAS_LUN_ID;
 833                        break;
 834                default:
 835                        break;
 836                }
 837        }
 838
 839out:
 840        kfree(orig);
 841        return (!ret) ? count : ret;
 842}
 843
 844static ssize_t pscsi_check_configfs_dev_params(
 845        struct se_hba *hba,
 846        struct se_subsystem_dev *se_dev)
 847{
 848        struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 849
 850        if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
 851            !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
 852            !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
 853                pr_err("Missing scsi_channel_id=, scsi_target_id= and"
 854                        " scsi_lun_id= parameters\n");
 855                return -EINVAL;
 856        }
 857
 858        return 0;
 859}
 860
 861static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
 862                                              struct se_subsystem_dev *se_dev,
 863                                              char *b)
 864{
 865        struct pscsi_hba_virt *phv = hba->hba_ptr;
 866        struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
 867        struct scsi_device *sd = pdv->pdv_sd;
 868        unsigned char host_id[16];
 869        ssize_t bl;
 870        int i;
 871
 872        if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
 873                snprintf(host_id, 16, "%d", pdv->pdv_host_id);
 874        else
 875                snprintf(host_id, 16, "PHBA Mode");
 876
 877        bl = sprintf(b, "SCSI Device Bus Location:"
 878                " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
 879                pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
 880                host_id);
 881
 882        if (sd) {
 883                bl += sprintf(b + bl, "        ");
 884                bl += sprintf(b + bl, "Vendor: ");
 885                for (i = 0; i < 8; i++) {
 886                        if (ISPRINT(sd->vendor[i]))   /* printable character? */
 887                                bl += sprintf(b + bl, "%c", sd->vendor[i]);
 888                        else
 889                                bl += sprintf(b + bl, " ");
 890                }
 891                bl += sprintf(b + bl, " Model: ");
 892                for (i = 0; i < 16; i++) {
 893                        if (ISPRINT(sd->model[i]))   /* printable character ? */
 894                                bl += sprintf(b + bl, "%c", sd->model[i]);
 895                        else
 896                                bl += sprintf(b + bl, " ");
 897                }
 898                bl += sprintf(b + bl, " Rev: ");
 899                for (i = 0; i < 4; i++) {
 900                        if (ISPRINT(sd->rev[i]))   /* printable character ? */
 901                                bl += sprintf(b + bl, "%c", sd->rev[i]);
 902                        else
 903                                bl += sprintf(b + bl, " ");
 904                }
 905                bl += sprintf(b + bl, "\n");
 906        }
 907        return bl;
 908}
 909
 910static void pscsi_bi_endio(struct bio *bio, int error)
 911{
 912        bio_put(bio);
 913}
 914
 915static inline struct bio *pscsi_get_bio(int sg_num)
 916{
 917        struct bio *bio;
 918        /*
 919         * Use bio_malloc() following the comment in for bio -> struct request
 920         * in block/blk-core.c:blk_make_request()
 921         */
 922        bio = bio_kmalloc(GFP_KERNEL, sg_num);
 923        if (!bio) {
 924                pr_err("PSCSI: bio_kmalloc() failed\n");
 925                return NULL;
 926        }
 927        bio->bi_end_io = pscsi_bi_endio;
 928
 929        return bio;
 930}
 931
 932static int pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl,
 933                u32 sgl_nents, enum dma_data_direction data_direction,
 934                struct bio **hbio)
 935{
 936        struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
 937        struct bio *bio = NULL, *tbio = NULL;
 938        struct page *page;
 939        struct scatterlist *sg;
 940        u32 data_len = cmd->data_length, i, len, bytes, off;
 941        int nr_pages = (cmd->data_length + sgl[0].offset +
 942                        PAGE_SIZE - 1) >> PAGE_SHIFT;
 943        int nr_vecs = 0, rc;
 944        int rw = (data_direction == DMA_TO_DEVICE);
 945
 946        *hbio = NULL;
 947
 948        pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
 949
 950        for_each_sg(sgl, sg, sgl_nents, i) {
 951                page = sg_page(sg);
 952                off = sg->offset;
 953                len = sg->length;
 954
 955                pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
 956                        page, len, off);
 957
 958                while (len > 0 && data_len > 0) {
 959                        bytes = min_t(unsigned int, len, PAGE_SIZE - off);
 960                        bytes = min(bytes, data_len);
 961
 962                        if (!bio) {
 963                                nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
 964                                nr_pages -= nr_vecs;
 965                                /*
 966                                 * Calls bio_kmalloc() and sets bio->bi_end_io()
 967                                 */
 968                                bio = pscsi_get_bio(nr_vecs);
 969                                if (!bio)
 970                                        goto fail;
 971
 972                                if (rw)
 973                                        bio->bi_rw |= REQ_WRITE;
 974
 975                                pr_debug("PSCSI: Allocated bio: %p,"
 976                                        " dir: %s nr_vecs: %d\n", bio,
 977                                        (rw) ? "rw" : "r", nr_vecs);
 978                                /*
 979                                 * Set *hbio pointer to handle the case:
 980                                 * nr_pages > BIO_MAX_PAGES, where additional
 981                                 * bios need to be added to complete a given
 982                                 * command.
 983                                 */
 984                                if (!*hbio)
 985                                        *hbio = tbio = bio;
 986                                else
 987                                        tbio = tbio->bi_next = bio;
 988                        }
 989
 990                        pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
 991                                " bio: %p page: %p len: %d off: %d\n", i, bio,
 992                                page, len, off);
 993
 994                        rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
 995                                        bio, page, bytes, off);
 996                        if (rc != bytes)
 997                                goto fail;
 998
 999                        pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1000                                bio->bi_vcnt, nr_vecs);
1001
1002                        if (bio->bi_vcnt > nr_vecs) {
1003                                pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1004                                        " %d i: %d bio: %p, allocating another"
1005                                        " bio\n", bio->bi_vcnt, i, bio);
1006                                /*
1007                                 * Clear the pointer so that another bio will
1008                                 * be allocated with pscsi_get_bio() above, the
1009                                 * current bio has already been set *tbio and
1010                                 * bio->bi_next.
1011                                 */
1012                                bio = NULL;
1013                        }
1014
1015                        page++;
1016                        len -= bytes;
1017                        data_len -= bytes;
1018                        off = 0;
1019                }
1020        }
1021
1022        return sgl_nents;
1023fail:
1024        while (*hbio) {
1025                bio = *hbio;
1026                *hbio = (*hbio)->bi_next;
1027                bio->bi_next = NULL;
1028                bio_endio(bio, 0);      /* XXX: should be error */
1029        }
1030        cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1031        return -ENOMEM;
1032}
1033
1034/*
1035 * Clear a lun set in the cdb if the initiator talking to use spoke
1036 * and old standards version, as we can't assume the underlying device
1037 * won't choke up on it.
1038 */
1039static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
1040{
1041        switch (cdb[0]) {
1042        case READ_10: /* SBC - RDProtect */
1043        case READ_12: /* SBC - RDProtect */
1044        case READ_16: /* SBC - RDProtect */
1045        case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1046        case VERIFY: /* SBC - VRProtect */
1047        case VERIFY_16: /* SBC - VRProtect */
1048        case WRITE_VERIFY: /* SBC - VRProtect */
1049        case WRITE_VERIFY_12: /* SBC - VRProtect */
1050        case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1051                break;
1052        default:
1053                cdb[1] &= 0x1f; /* clear logical unit number */
1054                break;
1055        }
1056}
1057
1058static int pscsi_parse_cdb(struct se_cmd *cmd)
1059{
1060        unsigned char *cdb = cmd->t_task_cdb;
1061        unsigned int dummy_size;
1062        int ret;
1063
1064        if (cmd->se_cmd_flags & SCF_BIDI) {
1065                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1066                cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1067                return -EINVAL;
1068        }
1069
1070        pscsi_clear_cdb_lun(cdb);
1071
1072        /*
1073         * For REPORT LUNS we always need to emulate the response, for everything
1074         * else the default for pSCSI is to pass the command to the underlying
1075         * LLD / physical hardware.
1076         */
1077        switch (cdb[0]) {
1078        case REPORT_LUNS:
1079                ret = spc_parse_cdb(cmd, &dummy_size);
1080                if (ret)
1081                        return ret;
1082                break;
1083        case READ_6:
1084        case READ_10:
1085        case READ_12:
1086        case READ_16:
1087        case WRITE_6:
1088        case WRITE_10:
1089        case WRITE_12:
1090        case WRITE_16:
1091        case WRITE_VERIFY:
1092                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1093                /* FALLTHROUGH*/
1094        default:
1095                cmd->execute_cmd = pscsi_execute_cmd;
1096                break;
1097        }
1098
1099        return 0;
1100}
1101
1102static int pscsi_execute_cmd(struct se_cmd *cmd)
1103{
1104        struct scatterlist *sgl = cmd->t_data_sg;
1105        u32 sgl_nents = cmd->t_data_nents;
1106        enum dma_data_direction data_direction = cmd->data_direction;
1107        struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
1108        struct pscsi_plugin_task *pt;
1109        struct request *req;
1110        struct bio *hbio;
1111        int ret;
1112
1113        /*
1114         * Dynamically alloc cdb space, since it may be larger than
1115         * TCM_MAX_COMMAND_SIZE
1116         */
1117        pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1118        if (!pt) {
1119                cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1120                return -ENOMEM;
1121        }
1122        cmd->priv = pt;
1123
1124        memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1125                scsi_command_size(cmd->t_task_cdb));
1126
1127        if (!sgl) {
1128                req = blk_get_request(pdv->pdv_sd->request_queue,
1129                                (data_direction == DMA_TO_DEVICE),
1130                                GFP_KERNEL);
1131                if (!req || IS_ERR(req)) {
1132                        pr_err("PSCSI: blk_get_request() failed: %ld\n",
1133                                        req ? IS_ERR(req) : -ENOMEM);
1134                        cmd->scsi_sense_reason =
1135                                TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1136                        goto fail;
1137                }
1138        } else {
1139                BUG_ON(!cmd->data_length);
1140
1141                ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1142                if (ret < 0) {
1143                        cmd->scsi_sense_reason =
1144                                TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1145                        goto fail;
1146                }
1147
1148                req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1149                                       GFP_KERNEL);
1150                if (IS_ERR(req)) {
1151                        pr_err("pSCSI: blk_make_request() failed\n");
1152                        goto fail_free_bio;
1153                }
1154        }
1155
1156        req->cmd_type = REQ_TYPE_BLOCK_PC;
1157        req->end_io = pscsi_req_done;
1158        req->end_io_data = cmd;
1159        req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1160        req->cmd = &pt->pscsi_cdb[0];
1161        req->sense = &pt->pscsi_sense[0];
1162        req->sense_len = 0;
1163        if (pdv->pdv_sd->type == TYPE_DISK)
1164                req->timeout = PS_TIMEOUT_DISK;
1165        else
1166                req->timeout = PS_TIMEOUT_OTHER;
1167        req->retries = PS_RETRY;
1168
1169        blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1170                        (cmd->sam_task_attr == MSG_HEAD_TAG),
1171                        pscsi_req_done);
1172
1173        return 0;
1174
1175fail_free_bio:
1176        while (hbio) {
1177                struct bio *bio = hbio;
1178                hbio = hbio->bi_next;
1179                bio->bi_next = NULL;
1180                bio_endio(bio, 0);      /* XXX: should be error */
1181        }
1182        cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1183fail:
1184        kfree(pt);
1185        return -ENOMEM;
1186}
1187
1188/*      pscsi_get_device_rev():
1189 *
1190 *
1191 */
1192static u32 pscsi_get_device_rev(struct se_device *dev)
1193{
1194        struct pscsi_dev_virt *pdv = dev->dev_ptr;
1195        struct scsi_device *sd = pdv->pdv_sd;
1196
1197        return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1198}
1199
1200/*      pscsi_get_device_type():
1201 *
1202 *
1203 */
1204static u32 pscsi_get_device_type(struct se_device *dev)
1205{
1206        struct pscsi_dev_virt *pdv = dev->dev_ptr;
1207        struct scsi_device *sd = pdv->pdv_sd;
1208
1209        return sd->type;
1210}
1211
1212static sector_t pscsi_get_blocks(struct se_device *dev)
1213{
1214        struct pscsi_dev_virt *pdv = dev->dev_ptr;
1215
1216        if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1217                return pdv->pdv_bd->bd_part->nr_sects;
1218
1219        dump_stack();
1220        return 0;
1221}
1222
1223static void pscsi_req_done(struct request *req, int uptodate)
1224{
1225        struct se_cmd *cmd = req->end_io_data;
1226        struct pscsi_plugin_task *pt = cmd->priv;
1227
1228        pt->pscsi_result = req->errors;
1229        pt->pscsi_resid = req->resid_len;
1230
1231        cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1232        if (cmd->scsi_status) {
1233                pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1234                        " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1235                        pt->pscsi_result);
1236        }
1237
1238        switch (host_byte(pt->pscsi_result)) {
1239        case DID_OK:
1240                target_complete_cmd(cmd, cmd->scsi_status);
1241                break;
1242        default:
1243                pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1244                        " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1245                        pt->pscsi_result);
1246                cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1247                target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1248                break;
1249        }
1250
1251        __blk_put_request(req->q, req);
1252        kfree(pt);
1253}
1254
1255static struct se_subsystem_api pscsi_template = {
1256        .name                   = "pscsi",
1257        .owner                  = THIS_MODULE,
1258        .transport_type         = TRANSPORT_PLUGIN_PHBA_PDEV,
1259        .attach_hba             = pscsi_attach_hba,
1260        .detach_hba             = pscsi_detach_hba,
1261        .pmode_enable_hba       = pscsi_pmode_enable_hba,
1262        .allocate_virtdevice    = pscsi_allocate_virtdevice,
1263        .create_virtdevice      = pscsi_create_virtdevice,
1264        .free_device            = pscsi_free_device,
1265        .transport_complete     = pscsi_transport_complete,
1266        .parse_cdb              = pscsi_parse_cdb,
1267        .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1268        .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1269        .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1270        .get_device_rev         = pscsi_get_device_rev,
1271        .get_device_type        = pscsi_get_device_type,
1272        .get_blocks             = pscsi_get_blocks,
1273};
1274
1275static int __init pscsi_module_init(void)
1276{
1277        return transport_subsystem_register(&pscsi_template);
1278}
1279
1280static void pscsi_module_exit(void)
1281{
1282        transport_subsystem_release(&pscsi_template);
1283}
1284
1285MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1286MODULE_AUTHOR("nab@Linux-iSCSI.org");
1287MODULE_LICENSE("GPL");
1288
1289module_init(pscsi_module_init);
1290module_exit(pscsi_module_exit);
1291
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