1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_pscsi.c 4 * 5 * This file contains the generic target mode <-> Linux SCSI subsystem plugin. 6 * 7 * (c) Copyright 2003-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 ******************************************************************************/ 12 13 #include <linux/string.h> 14 #include <linux/parser.h> 15 #include <linux/timer.h> 16 #include <linux/blkdev.h> 17 #include <linux/blk_types.h> 18 #include <linux/slab.h> 19 #include <linux/spinlock.h> 20 #include <linux/cdrom.h> 21 #include <linux/ratelimit.h> 22 #include <linux/module.h> 23 #include <asm/unaligned.h> 24 25 #include <scsi/scsi_device.h> 26 #include <scsi/scsi_host.h> 27 #include <scsi/scsi_tcq.h> 28 29 #include <target/target_core_base.h> 30 #include <target/target_core_backend.h> 31 32 #include "target_core_alua.h" 33 #include "target_core_internal.h" 34 #include "target_core_pscsi.h" 35 36 static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev) 37 { 38 return container_of(dev, struct pscsi_dev_virt, dev); 39 } 40 41 static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd); 42 static enum rq_end_io_ret pscsi_req_done(struct request *, blk_status_t); 43 44 /* pscsi_attach_hba(): 45 * 46 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host. 47 * from the passed SCSI Host ID. 48 */ 49 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id) 50 { 51 struct pscsi_hba_virt *phv; 52 53 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL); 54 if (!phv) { 55 pr_err("Unable to allocate struct pscsi_hba_virt\n"); 56 return -ENOMEM; 57 } 58 phv->phv_host_id = host_id; 59 phv->phv_mode = PHV_VIRTUAL_HOST_ID; 60 61 hba->hba_ptr = phv; 62 63 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on" 64 " Generic Target Core Stack %s\n", hba->hba_id, 65 PSCSI_VERSION, TARGET_CORE_VERSION); 66 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n", 67 hba->hba_id); 68 69 return 0; 70 } 71 72 static void pscsi_detach_hba(struct se_hba *hba) 73 { 74 struct pscsi_hba_virt *phv = hba->hba_ptr; 75 struct Scsi_Host *scsi_host = phv->phv_lld_host; 76 77 if (scsi_host) { 78 scsi_host_put(scsi_host); 79 80 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from" 81 " Generic Target Core\n", hba->hba_id, 82 (scsi_host->hostt->name) ? (scsi_host->hostt->name) : 83 "Unknown"); 84 } else 85 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA" 86 " from Generic Target Core\n", hba->hba_id); 87 88 kfree(phv); 89 hba->hba_ptr = NULL; 90 } 91 92 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag) 93 { 94 struct pscsi_hba_virt *phv = hba->hba_ptr; 95 struct Scsi_Host *sh = phv->phv_lld_host; 96 /* 97 * Release the struct Scsi_Host 98 */ 99 if (!mode_flag) { 100 if (!sh) 101 return 0; 102 103 phv->phv_lld_host = NULL; 104 phv->phv_mode = PHV_VIRTUAL_HOST_ID; 105 106 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough" 107 " %s\n", hba->hba_id, (sh->hostt->name) ? 108 (sh->hostt->name) : "Unknown"); 109 110 scsi_host_put(sh); 111 return 0; 112 } 113 /* 114 * Otherwise, locate struct Scsi_Host from the original passed 115 * pSCSI Host ID and enable for phba mode 116 */ 117 sh = scsi_host_lookup(phv->phv_host_id); 118 if (!sh) { 119 pr_err("pSCSI: Unable to locate SCSI Host for" 120 " phv_host_id: %d\n", phv->phv_host_id); 121 return -EINVAL; 122 } 123 124 phv->phv_lld_host = sh; 125 phv->phv_mode = PHV_LLD_SCSI_HOST_NO; 126 127 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n", 128 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown"); 129 130 return 1; 131 } 132 133 static void pscsi_tape_read_blocksize(struct se_device *dev, 134 struct scsi_device *sdev) 135 { 136 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 137 int ret; 138 139 buf = kzalloc(12, GFP_KERNEL); 140 if (!buf) 141 goto out_free; 142 143 memset(cdb, 0, MAX_COMMAND_SIZE); 144 cdb[0] = MODE_SENSE; 145 cdb[4] = 0x0c; /* 12 bytes */ 146 147 ret = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, buf, 12, HZ, 1, NULL); 148 if (ret) 149 goto out_free; 150 151 /* 152 * If MODE_SENSE still returns zero, set the default value to 1024. 153 */ 154 sdev->sector_size = get_unaligned_be24(&buf[9]); 155 out_free: 156 if (!sdev->sector_size) 157 sdev->sector_size = 1024; 158 159 kfree(buf); 160 } 161 162 static void 163 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn) 164 { 165 if (sdev->inquiry_len < INQUIRY_LEN) 166 return; 167 /* 168 * Use sdev->inquiry data from drivers/scsi/scsi_scan.c:scsi_add_lun() 169 */ 170 BUILD_BUG_ON(sizeof(wwn->vendor) != INQUIRY_VENDOR_LEN + 1); 171 snprintf(wwn->vendor, sizeof(wwn->vendor), 172 "%." __stringify(INQUIRY_VENDOR_LEN) "s", sdev->vendor); 173 BUILD_BUG_ON(sizeof(wwn->model) != INQUIRY_MODEL_LEN + 1); 174 snprintf(wwn->model, sizeof(wwn->model), 175 "%." __stringify(INQUIRY_MODEL_LEN) "s", sdev->model); 176 BUILD_BUG_ON(sizeof(wwn->revision) != INQUIRY_REVISION_LEN + 1); 177 snprintf(wwn->revision, sizeof(wwn->revision), 178 "%." __stringify(INQUIRY_REVISION_LEN) "s", sdev->rev); 179 } 180 181 static int 182 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn) 183 { 184 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 185 int ret; 186 187 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 188 if (!buf) 189 return -ENOMEM; 190 191 memset(cdb, 0, MAX_COMMAND_SIZE); 192 cdb[0] = INQUIRY; 193 cdb[1] = 0x01; /* Query VPD */ 194 cdb[2] = 0x80; /* Unit Serial Number */ 195 put_unaligned_be16(INQUIRY_VPD_SERIAL_LEN, &cdb[3]); 196 197 ret = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, buf, 198 INQUIRY_VPD_SERIAL_LEN, HZ, 1, NULL); 199 if (ret) 200 goto out_free; 201 202 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]); 203 204 wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL; 205 206 kfree(buf); 207 return 0; 208 209 out_free: 210 kfree(buf); 211 return -EPERM; 212 } 213 214 static void 215 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev, 216 struct t10_wwn *wwn) 217 { 218 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83; 219 int ident_len, page_len, off = 4, ret; 220 struct t10_vpd *vpd; 221 222 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 223 if (!buf) 224 return; 225 226 memset(cdb, 0, MAX_COMMAND_SIZE); 227 cdb[0] = INQUIRY; 228 cdb[1] = 0x01; /* Query VPD */ 229 cdb[2] = 0x83; /* Device Identifier */ 230 put_unaligned_be16(INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, &cdb[3]); 231 232 ret = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, buf, 233 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, HZ, 1, NULL); 234 if (ret) 235 goto out; 236 237 page_len = get_unaligned_be16(&buf[2]); 238 while (page_len > 0) { 239 /* Grab a pointer to the Identification descriptor */ 240 page_83 = &buf[off]; 241 ident_len = page_83[3]; 242 if (!ident_len) { 243 pr_err("page_83[3]: identifier" 244 " length zero!\n"); 245 break; 246 } 247 pr_debug("T10 VPD Identifier Length: %d\n", ident_len); 248 249 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL); 250 if (!vpd) { 251 pr_err("Unable to allocate memory for" 252 " struct t10_vpd\n"); 253 goto out; 254 } 255 INIT_LIST_HEAD(&vpd->vpd_list); 256 257 transport_set_vpd_proto_id(vpd, page_83); 258 transport_set_vpd_assoc(vpd, page_83); 259 260 if (transport_set_vpd_ident_type(vpd, page_83) < 0) { 261 off += (ident_len + 4); 262 page_len -= (ident_len + 4); 263 kfree(vpd); 264 continue; 265 } 266 if (transport_set_vpd_ident(vpd, page_83) < 0) { 267 off += (ident_len + 4); 268 page_len -= (ident_len + 4); 269 kfree(vpd); 270 continue; 271 } 272 273 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list); 274 off += (ident_len + 4); 275 page_len -= (ident_len + 4); 276 } 277 278 out: 279 kfree(buf); 280 } 281 282 static int pscsi_add_device_to_list(struct se_device *dev, 283 struct scsi_device *sd) 284 { 285 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 286 struct request_queue *q = sd->request_queue; 287 288 pdv->pdv_sd = sd; 289 290 if (!sd->queue_depth) { 291 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH; 292 293 pr_err("Set broken SCSI Device %d:%d:%llu" 294 " queue_depth to %d\n", sd->channel, sd->id, 295 sd->lun, sd->queue_depth); 296 } 297 298 dev->dev_attrib.hw_block_size = 299 min_not_zero((int)sd->sector_size, 512); 300 dev->dev_attrib.hw_max_sectors = 301 min_not_zero(sd->host->max_sectors, queue_max_hw_sectors(q)); 302 dev->dev_attrib.hw_queue_depth = sd->queue_depth; 303 304 /* 305 * Setup our standard INQUIRY info into se_dev->t10_wwn 306 */ 307 pscsi_set_inquiry_info(sd, &dev->t10_wwn); 308 309 /* 310 * Locate VPD WWN Information used for various purposes within 311 * the Storage Engine. 312 */ 313 if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) { 314 /* 315 * If VPD Unit Serial returned GOOD status, try 316 * VPD Device Identification page (0x83). 317 */ 318 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn); 319 } 320 321 /* 322 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE. 323 */ 324 if (sd->type == TYPE_TAPE) { 325 pscsi_tape_read_blocksize(dev, sd); 326 dev->dev_attrib.hw_block_size = sd->sector_size; 327 } 328 return 0; 329 } 330 331 static struct se_device *pscsi_alloc_device(struct se_hba *hba, 332 const char *name) 333 { 334 struct pscsi_dev_virt *pdv; 335 336 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL); 337 if (!pdv) { 338 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n"); 339 return NULL; 340 } 341 342 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name); 343 return &pdv->dev; 344 } 345 346 /* 347 * Called with struct Scsi_Host->host_lock called. 348 */ 349 static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd) 350 __releases(sh->host_lock) 351 { 352 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 353 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 354 struct Scsi_Host *sh = sd->host; 355 struct block_device *bd; 356 int ret; 357 358 if (scsi_device_get(sd)) { 359 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n", 360 sh->host_no, sd->channel, sd->id, sd->lun); 361 spin_unlock_irq(sh->host_lock); 362 return -EIO; 363 } 364 spin_unlock_irq(sh->host_lock); 365 /* 366 * Claim exclusive struct block_device access to struct scsi_device 367 * for TYPE_DISK and TYPE_ZBC using supplied udev_path 368 */ 369 bd = blkdev_get_by_path(dev->udev_path, BLK_OPEN_WRITE | BLK_OPEN_READ, 370 pdv, NULL); 371 if (IS_ERR(bd)) { 372 pr_err("pSCSI: blkdev_get_by_path() failed\n"); 373 scsi_device_put(sd); 374 return PTR_ERR(bd); 375 } 376 pdv->pdv_bd = bd; 377 378 ret = pscsi_add_device_to_list(dev, sd); 379 if (ret) { 380 blkdev_put(pdv->pdv_bd, pdv); 381 scsi_device_put(sd); 382 return ret; 383 } 384 385 pr_debug("CORE_PSCSI[%d] - Added TYPE_%s for %d:%d:%d:%llu\n", 386 phv->phv_host_id, sd->type == TYPE_DISK ? "DISK" : "ZBC", 387 sh->host_no, sd->channel, sd->id, sd->lun); 388 return 0; 389 } 390 391 /* 392 * Called with struct Scsi_Host->host_lock called. 393 */ 394 static int pscsi_create_type_nondisk(struct se_device *dev, struct scsi_device *sd) 395 __releases(sh->host_lock) 396 { 397 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 398 struct Scsi_Host *sh = sd->host; 399 int ret; 400 401 if (scsi_device_get(sd)) { 402 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n", 403 sh->host_no, sd->channel, sd->id, sd->lun); 404 spin_unlock_irq(sh->host_lock); 405 return -EIO; 406 } 407 spin_unlock_irq(sh->host_lock); 408 409 ret = pscsi_add_device_to_list(dev, sd); 410 if (ret) { 411 scsi_device_put(sd); 412 return ret; 413 } 414 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n", 415 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 416 sd->channel, sd->id, sd->lun); 417 418 return 0; 419 } 420 421 static int pscsi_configure_device(struct se_device *dev) 422 { 423 struct se_hba *hba = dev->se_hba; 424 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 425 struct scsi_device *sd; 426 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 427 struct Scsi_Host *sh = phv->phv_lld_host; 428 int legacy_mode_enable = 0; 429 int ret; 430 431 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) || 432 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) || 433 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) { 434 pr_err("Missing scsi_channel_id=, scsi_target_id= and" 435 " scsi_lun_id= parameters\n"); 436 return -EINVAL; 437 } 438 439 /* 440 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the 441 * struct Scsi_Host we will need to bring the TCM/pSCSI object online 442 */ 443 if (!sh) { 444 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 445 pr_err("pSCSI: Unable to locate struct" 446 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n"); 447 return -ENODEV; 448 } 449 /* 450 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device 451 * reference, we enforce that udev_path has been set 452 */ 453 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) { 454 pr_err("pSCSI: udev_path attribute has not" 455 " been set before ENABLE=1\n"); 456 return -EINVAL; 457 } 458 /* 459 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID, 460 * use the original TCM hba ID to reference Linux/SCSI Host No 461 * and enable for PHV_LLD_SCSI_HOST_NO mode. 462 */ 463 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) { 464 if (hba->dev_count) { 465 pr_err("pSCSI: Unable to set hba_mode" 466 " with active devices\n"); 467 return -EEXIST; 468 } 469 470 if (pscsi_pmode_enable_hba(hba, 1) != 1) 471 return -ENODEV; 472 473 legacy_mode_enable = 1; 474 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE; 475 sh = phv->phv_lld_host; 476 } else { 477 sh = scsi_host_lookup(pdv->pdv_host_id); 478 if (!sh) { 479 pr_err("pSCSI: Unable to locate" 480 " pdv_host_id: %d\n", pdv->pdv_host_id); 481 return -EINVAL; 482 } 483 pdv->pdv_lld_host = sh; 484 } 485 } else { 486 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) { 487 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while" 488 " struct Scsi_Host exists\n"); 489 return -EEXIST; 490 } 491 } 492 493 spin_lock_irq(sh->host_lock); 494 list_for_each_entry(sd, &sh->__devices, siblings) { 495 if ((pdv->pdv_channel_id != sd->channel) || 496 (pdv->pdv_target_id != sd->id) || 497 (pdv->pdv_lun_id != sd->lun)) 498 continue; 499 /* 500 * Functions will release the held struct scsi_host->host_lock 501 * before calling pscsi_add_device_to_list() to register 502 * struct scsi_device with target_core_mod. 503 */ 504 switch (sd->type) { 505 case TYPE_DISK: 506 case TYPE_ZBC: 507 ret = pscsi_create_type_disk(dev, sd); 508 break; 509 default: 510 ret = pscsi_create_type_nondisk(dev, sd); 511 break; 512 } 513 514 if (ret) { 515 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 516 scsi_host_put(sh); 517 else if (legacy_mode_enable) { 518 pscsi_pmode_enable_hba(hba, 0); 519 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 520 } 521 pdv->pdv_sd = NULL; 522 return ret; 523 } 524 return 0; 525 } 526 spin_unlock_irq(sh->host_lock); 527 528 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no, 529 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id); 530 531 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 532 scsi_host_put(sh); 533 else if (legacy_mode_enable) { 534 pscsi_pmode_enable_hba(hba, 0); 535 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 536 } 537 538 return -ENODEV; 539 } 540 541 static void pscsi_dev_call_rcu(struct rcu_head *p) 542 { 543 struct se_device *dev = container_of(p, struct se_device, rcu_head); 544 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 545 546 kfree(pdv); 547 } 548 549 static void pscsi_free_device(struct se_device *dev) 550 { 551 call_rcu(&dev->rcu_head, pscsi_dev_call_rcu); 552 } 553 554 static void pscsi_destroy_device(struct se_device *dev) 555 { 556 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 557 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 558 struct scsi_device *sd = pdv->pdv_sd; 559 560 if (sd) { 561 /* 562 * Release exclusive pSCSI internal struct block_device claim for 563 * struct scsi_device with TYPE_DISK or TYPE_ZBC 564 * from pscsi_create_type_disk() 565 */ 566 if ((sd->type == TYPE_DISK || sd->type == TYPE_ZBC) && 567 pdv->pdv_bd) { 568 blkdev_put(pdv->pdv_bd, pdv); 569 pdv->pdv_bd = NULL; 570 } 571 /* 572 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference 573 * to struct Scsi_Host now. 574 */ 575 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) && 576 (phv->phv_lld_host != NULL)) 577 scsi_host_put(phv->phv_lld_host); 578 else if (pdv->pdv_lld_host) 579 scsi_host_put(pdv->pdv_lld_host); 580 581 scsi_device_put(sd); 582 583 pdv->pdv_sd = NULL; 584 } 585 } 586 587 static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status, 588 unsigned char *req_sense, int valid_data) 589 { 590 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); 591 struct scsi_device *sd = pdv->pdv_sd; 592 unsigned char *cdb = cmd->priv; 593 594 /* 595 * Special case for REPORT_LUNs which is emulated and not passed on. 596 */ 597 if (!cdb) 598 return; 599 600 /* 601 * Hack to make sure that Write-Protect modepage is set if R/O mode is 602 * forced. 603 */ 604 if (!cmd->data_length) 605 goto after_mode_sense; 606 607 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) && 608 scsi_status == SAM_STAT_GOOD) { 609 bool read_only = target_lun_is_rdonly(cmd); 610 611 if (read_only) { 612 unsigned char *buf; 613 614 buf = transport_kmap_data_sg(cmd); 615 if (!buf) { 616 ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */ 617 } else { 618 if (cdb[0] == MODE_SENSE_10) { 619 if (!(buf[3] & 0x80)) 620 buf[3] |= 0x80; 621 } else { 622 if (!(buf[2] & 0x80)) 623 buf[2] |= 0x80; 624 } 625 626 transport_kunmap_data_sg(cmd); 627 } 628 } 629 } 630 after_mode_sense: 631 632 if (sd->type != TYPE_TAPE || !cmd->data_length) 633 goto after_mode_select; 634 635 /* 636 * Hack to correctly obtain the initiator requested blocksize for 637 * TYPE_TAPE. Since this value is dependent upon each tape media, 638 * struct scsi_device->sector_size will not contain the correct value 639 * by default, so we go ahead and set it so 640 * TRANSPORT(dev)->get_blockdev() returns the correct value to the 641 * storage engine. 642 */ 643 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) && 644 scsi_status == SAM_STAT_GOOD) { 645 unsigned char *buf; 646 u16 bdl; 647 u32 blocksize; 648 649 buf = sg_virt(&cmd->t_data_sg[0]); 650 if (!buf) { 651 pr_err("Unable to get buf for scatterlist\n"); 652 goto after_mode_select; 653 } 654 655 if (cdb[0] == MODE_SELECT) 656 bdl = buf[3]; 657 else 658 bdl = get_unaligned_be16(&buf[6]); 659 660 if (!bdl) 661 goto after_mode_select; 662 663 if (cdb[0] == MODE_SELECT) 664 blocksize = get_unaligned_be24(&buf[9]); 665 else 666 blocksize = get_unaligned_be24(&buf[13]); 667 668 sd->sector_size = blocksize; 669 } 670 after_mode_select: 671 672 if (scsi_status == SAM_STAT_CHECK_CONDITION) { 673 transport_copy_sense_to_cmd(cmd, req_sense); 674 675 /* 676 * check for TAPE device reads with 677 * FM/EOM/ILI set, so that we can get data 678 * back despite framework assumption that a 679 * check condition means there is no data 680 */ 681 if (sd->type == TYPE_TAPE && valid_data && 682 cmd->data_direction == DMA_FROM_DEVICE) { 683 /* 684 * is sense data valid, fixed format, 685 * and have FM, EOM, or ILI set? 686 */ 687 if (req_sense[0] == 0xf0 && /* valid, fixed format */ 688 req_sense[2] & 0xe0 && /* FM, EOM, or ILI */ 689 (req_sense[2] & 0xf) == 0) { /* key==NO_SENSE */ 690 pr_debug("Tape FM/EOM/ILI status detected. Treat as normal read.\n"); 691 cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; 692 } 693 } 694 } 695 } 696 697 enum { 698 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id, 699 Opt_scsi_lun_id, Opt_err 700 }; 701 702 static match_table_t tokens = { 703 {Opt_scsi_host_id, "scsi_host_id=%d"}, 704 {Opt_scsi_channel_id, "scsi_channel_id=%d"}, 705 {Opt_scsi_target_id, "scsi_target_id=%d"}, 706 {Opt_scsi_lun_id, "scsi_lun_id=%d"}, 707 {Opt_err, NULL} 708 }; 709 710 static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev, 711 const char *page, ssize_t count) 712 { 713 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 714 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 715 char *orig, *ptr, *opts; 716 substring_t args[MAX_OPT_ARGS]; 717 int ret = 0, arg, token; 718 719 opts = kstrdup(page, GFP_KERNEL); 720 if (!opts) 721 return -ENOMEM; 722 723 orig = opts; 724 725 while ((ptr = strsep(&opts, ",\n")) != NULL) { 726 if (!*ptr) 727 continue; 728 729 token = match_token(ptr, tokens, args); 730 switch (token) { 731 case Opt_scsi_host_id: 732 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 733 pr_err("PSCSI[%d]: Unable to accept" 734 " scsi_host_id while phv_mode ==" 735 " PHV_LLD_SCSI_HOST_NO\n", 736 phv->phv_host_id); 737 ret = -EINVAL; 738 goto out; 739 } 740 ret = match_int(args, &arg); 741 if (ret) 742 goto out; 743 pdv->pdv_host_id = arg; 744 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:" 745 " %d\n", phv->phv_host_id, pdv->pdv_host_id); 746 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID; 747 break; 748 case Opt_scsi_channel_id: 749 ret = match_int(args, &arg); 750 if (ret) 751 goto out; 752 pdv->pdv_channel_id = arg; 753 pr_debug("PSCSI[%d]: Referencing SCSI Channel" 754 " ID: %d\n", phv->phv_host_id, 755 pdv->pdv_channel_id); 756 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID; 757 break; 758 case Opt_scsi_target_id: 759 ret = match_int(args, &arg); 760 if (ret) 761 goto out; 762 pdv->pdv_target_id = arg; 763 pr_debug("PSCSI[%d]: Referencing SCSI Target" 764 " ID: %d\n", phv->phv_host_id, 765 pdv->pdv_target_id); 766 pdv->pdv_flags |= PDF_HAS_TARGET_ID; 767 break; 768 case Opt_scsi_lun_id: 769 ret = match_int(args, &arg); 770 if (ret) 771 goto out; 772 pdv->pdv_lun_id = arg; 773 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:" 774 " %d\n", phv->phv_host_id, pdv->pdv_lun_id); 775 pdv->pdv_flags |= PDF_HAS_LUN_ID; 776 break; 777 default: 778 break; 779 } 780 } 781 782 out: 783 kfree(orig); 784 return (!ret) ? count : ret; 785 } 786 787 static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b) 788 { 789 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 790 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 791 struct scsi_device *sd = pdv->pdv_sd; 792 unsigned char host_id[16]; 793 ssize_t bl; 794 795 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 796 snprintf(host_id, 16, "%d", pdv->pdv_host_id); 797 else 798 snprintf(host_id, 16, "PHBA Mode"); 799 800 bl = sprintf(b, "SCSI Device Bus Location:" 801 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n", 802 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id, 803 host_id); 804 805 if (sd) { 806 bl += sprintf(b + bl, " Vendor: %." 807 __stringify(INQUIRY_VENDOR_LEN) "s", sd->vendor); 808 bl += sprintf(b + bl, " Model: %." 809 __stringify(INQUIRY_MODEL_LEN) "s", sd->model); 810 bl += sprintf(b + bl, " Rev: %." 811 __stringify(INQUIRY_REVISION_LEN) "s\n", sd->rev); 812 } 813 return bl; 814 } 815 816 static void pscsi_bi_endio(struct bio *bio) 817 { 818 bio_uninit(bio); 819 kfree(bio); 820 } 821 822 static sense_reason_t 823 pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 824 struct request *req) 825 { 826 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); 827 struct bio *bio = NULL; 828 struct page *page; 829 struct scatterlist *sg; 830 u32 data_len = cmd->data_length, i, len, bytes, off; 831 int nr_pages = (cmd->data_length + sgl[0].offset + 832 PAGE_SIZE - 1) >> PAGE_SHIFT; 833 int nr_vecs = 0, rc; 834 int rw = (cmd->data_direction == DMA_TO_DEVICE); 835 836 BUG_ON(!cmd->data_length); 837 838 pr_debug("PSCSI: nr_pages: %d\n", nr_pages); 839 840 for_each_sg(sgl, sg, sgl_nents, i) { 841 page = sg_page(sg); 842 off = sg->offset; 843 len = sg->length; 844 845 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i, 846 page, len, off); 847 848 /* 849 * We only have one page of data in each sg element, 850 * we can not cross a page boundary. 851 */ 852 if (off + len > PAGE_SIZE) 853 goto fail; 854 855 if (len > 0 && data_len > 0) { 856 bytes = min_t(unsigned int, len, PAGE_SIZE - off); 857 bytes = min(bytes, data_len); 858 859 if (!bio) { 860 new_bio: 861 nr_vecs = bio_max_segs(nr_pages); 862 bio = bio_kmalloc(nr_vecs, GFP_KERNEL); 863 if (!bio) 864 goto fail; 865 bio_init(bio, NULL, bio->bi_inline_vecs, nr_vecs, 866 rw ? REQ_OP_WRITE : REQ_OP_READ); 867 bio->bi_end_io = pscsi_bi_endio; 868 869 pr_debug("PSCSI: Allocated bio: %p," 870 " dir: %s nr_vecs: %d\n", bio, 871 (rw) ? "rw" : "r", nr_vecs); 872 } 873 874 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d" 875 " bio: %p page: %p len: %d off: %d\n", i, bio, 876 page, len, off); 877 878 rc = bio_add_pc_page(pdv->pdv_sd->request_queue, 879 bio, page, bytes, off); 880 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n", 881 bio_segments(bio), nr_vecs); 882 if (rc != bytes) { 883 pr_debug("PSCSI: Reached bio->bi_vcnt max:" 884 " %d i: %d bio: %p, allocating another" 885 " bio\n", bio->bi_vcnt, i, bio); 886 887 rc = blk_rq_append_bio(req, bio); 888 if (rc) { 889 pr_err("pSCSI: failed to append bio\n"); 890 goto fail; 891 } 892 893 goto new_bio; 894 } 895 896 data_len -= bytes; 897 } 898 } 899 900 if (bio) { 901 rc = blk_rq_append_bio(req, bio); 902 if (rc) { 903 pr_err("pSCSI: failed to append bio\n"); 904 goto fail; 905 } 906 } 907 908 return 0; 909 fail: 910 if (bio) 911 bio_put(bio); 912 while (req->bio) { 913 bio = req->bio; 914 req->bio = bio->bi_next; 915 bio_put(bio); 916 } 917 req->biotail = NULL; 918 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 919 } 920 921 static sense_reason_t 922 pscsi_parse_cdb(struct se_cmd *cmd) 923 { 924 if (cmd->se_cmd_flags & SCF_BIDI) 925 return TCM_UNSUPPORTED_SCSI_OPCODE; 926 927 return passthrough_parse_cdb(cmd, pscsi_execute_cmd); 928 } 929 930 static sense_reason_t 931 pscsi_execute_cmd(struct se_cmd *cmd) 932 { 933 struct scatterlist *sgl = cmd->t_data_sg; 934 u32 sgl_nents = cmd->t_data_nents; 935 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); 936 struct scsi_cmnd *scmd; 937 struct request *req; 938 sense_reason_t ret; 939 940 req = scsi_alloc_request(pdv->pdv_sd->request_queue, 941 cmd->data_direction == DMA_TO_DEVICE ? 942 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); 943 if (IS_ERR(req)) 944 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 945 946 if (sgl) { 947 ret = pscsi_map_sg(cmd, sgl, sgl_nents, req); 948 if (ret) 949 goto fail_put_request; 950 } 951 952 req->end_io = pscsi_req_done; 953 req->end_io_data = cmd; 954 955 scmd = blk_mq_rq_to_pdu(req); 956 scmd->cmd_len = scsi_command_size(cmd->t_task_cdb); 957 if (scmd->cmd_len > sizeof(scmd->cmnd)) { 958 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 959 goto fail_put_request; 960 } 961 memcpy(scmd->cmnd, cmd->t_task_cdb, scmd->cmd_len); 962 963 if (pdv->pdv_sd->type == TYPE_DISK || 964 pdv->pdv_sd->type == TYPE_ZBC) 965 req->timeout = PS_TIMEOUT_DISK; 966 else 967 req->timeout = PS_TIMEOUT_OTHER; 968 scmd->allowed = PS_RETRY; 969 970 cmd->priv = scmd->cmnd; 971 972 blk_execute_rq_nowait(req, cmd->sam_task_attr == TCM_HEAD_TAG); 973 974 return 0; 975 976 fail_put_request: 977 blk_mq_free_request(req); 978 return ret; 979 } 980 981 /* pscsi_get_device_type(): 982 * 983 * 984 */ 985 static u32 pscsi_get_device_type(struct se_device *dev) 986 { 987 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 988 struct scsi_device *sd = pdv->pdv_sd; 989 990 return (sd) ? sd->type : TYPE_NO_LUN; 991 } 992 993 static sector_t pscsi_get_blocks(struct se_device *dev) 994 { 995 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 996 997 if (pdv->pdv_bd) 998 return bdev_nr_sectors(pdv->pdv_bd); 999 return 0; 1000 } 1001 1002 static enum rq_end_io_ret pscsi_req_done(struct request *req, 1003 blk_status_t status) 1004 { 1005 struct se_cmd *cmd = req->end_io_data; 1006 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req); 1007 enum sam_status scsi_status = scmd->result & 0xff; 1008 int valid_data = cmd->data_length - scmd->resid_len; 1009 u8 *cdb = cmd->priv; 1010 1011 if (scsi_status != SAM_STAT_GOOD) { 1012 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:" 1013 " 0x%02x Result: 0x%08x\n", cmd, cdb[0], scmd->result); 1014 } 1015 1016 pscsi_complete_cmd(cmd, scsi_status, scmd->sense_buffer, valid_data); 1017 1018 switch (host_byte(scmd->result)) { 1019 case DID_OK: 1020 target_complete_cmd_with_length(cmd, scsi_status, valid_data); 1021 break; 1022 default: 1023 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:" 1024 " 0x%02x Result: 0x%08x\n", cmd, cdb[0], scmd->result); 1025 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 1026 break; 1027 } 1028 1029 blk_mq_free_request(req); 1030 return RQ_END_IO_NONE; 1031 } 1032 1033 static const struct target_backend_ops pscsi_ops = { 1034 .name = "pscsi", 1035 .owner = THIS_MODULE, 1036 .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH | 1037 TRANSPORT_FLAG_PASSTHROUGH_ALUA | 1038 TRANSPORT_FLAG_PASSTHROUGH_PGR, 1039 .attach_hba = pscsi_attach_hba, 1040 .detach_hba = pscsi_detach_hba, 1041 .pmode_enable_hba = pscsi_pmode_enable_hba, 1042 .alloc_device = pscsi_alloc_device, 1043 .configure_device = pscsi_configure_device, 1044 .destroy_device = pscsi_destroy_device, 1045 .free_device = pscsi_free_device, 1046 .parse_cdb = pscsi_parse_cdb, 1047 .set_configfs_dev_params = pscsi_set_configfs_dev_params, 1048 .show_configfs_dev_params = pscsi_show_configfs_dev_params, 1049 .get_device_type = pscsi_get_device_type, 1050 .get_blocks = pscsi_get_blocks, 1051 .tb_dev_attrib_attrs = passthrough_attrib_attrs, 1052 }; 1053 1054 static int __init pscsi_module_init(void) 1055 { 1056 return transport_backend_register(&pscsi_ops); 1057 } 1058 1059 static void __exit pscsi_module_exit(void) 1060 { 1061 target_backend_unregister(&pscsi_ops); 1062 } 1063 1064 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin"); 1065 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 1066 MODULE_LICENSE("GPL"); 1067 1068 module_init(pscsi_module_init); 1069 module_exit(pscsi_module_exit); 1070