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/genhd.h> 21 #include <linux/cdrom.h> 22 #include <linux/ratelimit.h> 23 #include <linux/module.h> 24 #include <asm/unaligned.h> 25 26 #include <scsi/scsi_device.h> 27 #include <scsi/scsi_host.h> 28 #include <scsi/scsi_tcq.h> 29 30 #include <target/target_core_base.h> 31 #include <target/target_core_backend.h> 32 33 #include "target_core_alua.h" 34 #include "target_core_internal.h" 35 #include "target_core_pscsi.h" 36 37 static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev) 38 { 39 return container_of(dev, struct pscsi_dev_virt, dev); 40 } 41 42 static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd); 43 static void pscsi_req_done(struct request *, blk_status_t); 44 45 /* pscsi_attach_hba(): 46 * 47 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host. 48 * from the passed SCSI Host ID. 49 */ 50 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id) 51 { 52 struct pscsi_hba_virt *phv; 53 54 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL); 55 if (!phv) { 56 pr_err("Unable to allocate struct pscsi_hba_virt\n"); 57 return -ENOMEM; 58 } 59 phv->phv_host_id = host_id; 60 phv->phv_mode = PHV_VIRTUAL_HOST_ID; 61 62 hba->hba_ptr = phv; 63 64 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on" 65 " Generic Target Core Stack %s\n", hba->hba_id, 66 PSCSI_VERSION, TARGET_CORE_VERSION); 67 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n", 68 hba->hba_id); 69 70 return 0; 71 } 72 73 static void pscsi_detach_hba(struct se_hba *hba) 74 { 75 struct pscsi_hba_virt *phv = hba->hba_ptr; 76 struct Scsi_Host *scsi_host = phv->phv_lld_host; 77 78 if (scsi_host) { 79 scsi_host_put(scsi_host); 80 81 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from" 82 " Generic Target Core\n", hba->hba_id, 83 (scsi_host->hostt->name) ? (scsi_host->hostt->name) : 84 "Unknown"); 85 } else 86 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA" 87 " from Generic Target Core\n", hba->hba_id); 88 89 kfree(phv); 90 hba->hba_ptr = NULL; 91 } 92 93 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag) 94 { 95 struct pscsi_hba_virt *phv = hba->hba_ptr; 96 struct Scsi_Host *sh = phv->phv_lld_host; 97 /* 98 * Release the struct Scsi_Host 99 */ 100 if (!mode_flag) { 101 if (!sh) 102 return 0; 103 104 phv->phv_lld_host = NULL; 105 phv->phv_mode = PHV_VIRTUAL_HOST_ID; 106 107 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough" 108 " %s\n", hba->hba_id, (sh->hostt->name) ? 109 (sh->hostt->name) : "Unknown"); 110 111 scsi_host_put(sh); 112 return 0; 113 } 114 /* 115 * Otherwise, locate struct Scsi_Host from the original passed 116 * pSCSI Host ID and enable for phba mode 117 */ 118 sh = scsi_host_lookup(phv->phv_host_id); 119 if (!sh) { 120 pr_err("pSCSI: Unable to locate SCSI Host for" 121 " phv_host_id: %d\n", phv->phv_host_id); 122 return -EINVAL; 123 } 124 125 phv->phv_lld_host = sh; 126 phv->phv_mode = PHV_LLD_SCSI_HOST_NO; 127 128 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n", 129 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown"); 130 131 return 1; 132 } 133 134 static void pscsi_tape_read_blocksize(struct se_device *dev, 135 struct scsi_device *sdev) 136 { 137 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 138 int ret; 139 140 buf = kzalloc(12, GFP_KERNEL); 141 if (!buf) 142 goto out_free; 143 144 memset(cdb, 0, MAX_COMMAND_SIZE); 145 cdb[0] = MODE_SENSE; 146 cdb[4] = 0x0c; /* 12 bytes */ 147 148 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL, 149 HZ, 1, NULL); 150 if (ret) 151 goto out_free; 152 153 /* 154 * If MODE_SENSE still returns zero, set the default value to 1024. 155 */ 156 sdev->sector_size = get_unaligned_be24(&buf[9]); 157 out_free: 158 if (!sdev->sector_size) 159 sdev->sector_size = 1024; 160 161 kfree(buf); 162 } 163 164 static void 165 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn) 166 { 167 if (sdev->inquiry_len < INQUIRY_LEN) 168 return; 169 /* 170 * Use sdev->inquiry data from drivers/scsi/scsi_scan.c:scsi_add_lun() 171 */ 172 BUILD_BUG_ON(sizeof(wwn->vendor) != INQUIRY_VENDOR_LEN + 1); 173 snprintf(wwn->vendor, sizeof(wwn->vendor), 174 "%." __stringify(INQUIRY_VENDOR_LEN) "s", sdev->vendor); 175 BUILD_BUG_ON(sizeof(wwn->model) != INQUIRY_MODEL_LEN + 1); 176 snprintf(wwn->model, sizeof(wwn->model), 177 "%." __stringify(INQUIRY_MODEL_LEN) "s", sdev->model); 178 BUILD_BUG_ON(sizeof(wwn->revision) != INQUIRY_REVISION_LEN + 1); 179 snprintf(wwn->revision, sizeof(wwn->revision), 180 "%." __stringify(INQUIRY_REVISION_LEN) "s", sdev->rev); 181 } 182 183 static int 184 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn) 185 { 186 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 187 int ret; 188 189 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 190 if (!buf) 191 return -ENOMEM; 192 193 memset(cdb, 0, MAX_COMMAND_SIZE); 194 cdb[0] = INQUIRY; 195 cdb[1] = 0x01; /* Query VPD */ 196 cdb[2] = 0x80; /* Unit Serial Number */ 197 put_unaligned_be16(INQUIRY_VPD_SERIAL_LEN, &cdb[3]); 198 199 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 200 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL); 201 if (ret) 202 goto out_free; 203 204 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]); 205 206 wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL; 207 208 kfree(buf); 209 return 0; 210 211 out_free: 212 kfree(buf); 213 return -EPERM; 214 } 215 216 static void 217 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev, 218 struct t10_wwn *wwn) 219 { 220 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83; 221 int ident_len, page_len, off = 4, ret; 222 struct t10_vpd *vpd; 223 224 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 225 if (!buf) 226 return; 227 228 memset(cdb, 0, MAX_COMMAND_SIZE); 229 cdb[0] = INQUIRY; 230 cdb[1] = 0x01; /* Query VPD */ 231 cdb[2] = 0x83; /* Device Identifier */ 232 put_unaligned_be16(INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, &cdb[3]); 233 234 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 235 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, 236 NULL, HZ, 1, NULL); 237 if (ret) 238 goto out; 239 240 page_len = get_unaligned_be16(&buf[2]); 241 while (page_len > 0) { 242 /* Grab a pointer to the Identification descriptor */ 243 page_83 = &buf[off]; 244 ident_len = page_83[3]; 245 if (!ident_len) { 246 pr_err("page_83[3]: identifier" 247 " length zero!\n"); 248 break; 249 } 250 pr_debug("T10 VPD Identifier Length: %d\n", ident_len); 251 252 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL); 253 if (!vpd) { 254 pr_err("Unable to allocate memory for" 255 " struct t10_vpd\n"); 256 goto out; 257 } 258 INIT_LIST_HEAD(&vpd->vpd_list); 259 260 transport_set_vpd_proto_id(vpd, page_83); 261 transport_set_vpd_assoc(vpd, page_83); 262 263 if (transport_set_vpd_ident_type(vpd, page_83) < 0) { 264 off += (ident_len + 4); 265 page_len -= (ident_len + 4); 266 kfree(vpd); 267 continue; 268 } 269 if (transport_set_vpd_ident(vpd, page_83) < 0) { 270 off += (ident_len + 4); 271 page_len -= (ident_len + 4); 272 kfree(vpd); 273 continue; 274 } 275 276 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list); 277 off += (ident_len + 4); 278 page_len -= (ident_len + 4); 279 } 280 281 out: 282 kfree(buf); 283 } 284 285 static int pscsi_add_device_to_list(struct se_device *dev, 286 struct scsi_device *sd) 287 { 288 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 289 struct request_queue *q = sd->request_queue; 290 291 pdv->pdv_sd = sd; 292 293 if (!sd->queue_depth) { 294 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH; 295 296 pr_err("Set broken SCSI Device %d:%d:%llu" 297 " queue_depth to %d\n", sd->channel, sd->id, 298 sd->lun, sd->queue_depth); 299 } 300 301 dev->dev_attrib.hw_block_size = 302 min_not_zero((int)sd->sector_size, 512); 303 dev->dev_attrib.hw_max_sectors = 304 min_not_zero(sd->host->max_sectors, queue_max_hw_sectors(q)); 305 dev->dev_attrib.hw_queue_depth = sd->queue_depth; 306 307 /* 308 * Setup our standard INQUIRY info into se_dev->t10_wwn 309 */ 310 pscsi_set_inquiry_info(sd, &dev->t10_wwn); 311 312 /* 313 * Locate VPD WWN Information used for various purposes within 314 * the Storage Engine. 315 */ 316 if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) { 317 /* 318 * If VPD Unit Serial returned GOOD status, try 319 * VPD Device Identification page (0x83). 320 */ 321 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn); 322 } 323 324 /* 325 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE. 326 */ 327 if (sd->type == TYPE_TAPE) { 328 pscsi_tape_read_blocksize(dev, sd); 329 dev->dev_attrib.hw_block_size = sd->sector_size; 330 } 331 return 0; 332 } 333 334 static struct se_device *pscsi_alloc_device(struct se_hba *hba, 335 const char *name) 336 { 337 struct pscsi_dev_virt *pdv; 338 339 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL); 340 if (!pdv) { 341 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n"); 342 return NULL; 343 } 344 345 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name); 346 return &pdv->dev; 347 } 348 349 /* 350 * Called with struct Scsi_Host->host_lock called. 351 */ 352 static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd) 353 __releases(sh->host_lock) 354 { 355 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 356 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 357 struct Scsi_Host *sh = sd->host; 358 struct block_device *bd; 359 int ret; 360 361 if (scsi_device_get(sd)) { 362 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n", 363 sh->host_no, sd->channel, sd->id, sd->lun); 364 spin_unlock_irq(sh->host_lock); 365 return -EIO; 366 } 367 spin_unlock_irq(sh->host_lock); 368 /* 369 * Claim exclusive struct block_device access to struct scsi_device 370 * for TYPE_DISK and TYPE_ZBC using supplied udev_path 371 */ 372 bd = blkdev_get_by_path(dev->udev_path, 373 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv); 374 if (IS_ERR(bd)) { 375 pr_err("pSCSI: blkdev_get_by_path() failed\n"); 376 scsi_device_put(sd); 377 return PTR_ERR(bd); 378 } 379 pdv->pdv_bd = bd; 380 381 ret = pscsi_add_device_to_list(dev, sd); 382 if (ret) { 383 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 384 scsi_device_put(sd); 385 return ret; 386 } 387 388 pr_debug("CORE_PSCSI[%d] - Added TYPE_%s for %d:%d:%d:%llu\n", 389 phv->phv_host_id, sd->type == TYPE_DISK ? "DISK" : "ZBC", 390 sh->host_no, sd->channel, sd->id, sd->lun); 391 return 0; 392 } 393 394 /* 395 * Called with struct Scsi_Host->host_lock called. 396 */ 397 static int pscsi_create_type_nondisk(struct se_device *dev, struct scsi_device *sd) 398 __releases(sh->host_lock) 399 { 400 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 401 struct Scsi_Host *sh = sd->host; 402 int ret; 403 404 if (scsi_device_get(sd)) { 405 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n", 406 sh->host_no, sd->channel, sd->id, sd->lun); 407 spin_unlock_irq(sh->host_lock); 408 return -EIO; 409 } 410 spin_unlock_irq(sh->host_lock); 411 412 ret = pscsi_add_device_to_list(dev, sd); 413 if (ret) { 414 scsi_device_put(sd); 415 return ret; 416 } 417 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n", 418 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 419 sd->channel, sd->id, sd->lun); 420 421 return 0; 422 } 423 424 static int pscsi_configure_device(struct se_device *dev) 425 { 426 struct se_hba *hba = dev->se_hba; 427 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 428 struct scsi_device *sd; 429 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 430 struct Scsi_Host *sh = phv->phv_lld_host; 431 int legacy_mode_enable = 0; 432 int ret; 433 434 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) || 435 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) || 436 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) { 437 pr_err("Missing scsi_channel_id=, scsi_target_id= and" 438 " scsi_lun_id= parameters\n"); 439 return -EINVAL; 440 } 441 442 /* 443 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the 444 * struct Scsi_Host we will need to bring the TCM/pSCSI object online 445 */ 446 if (!sh) { 447 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 448 pr_err("pSCSI: Unable to locate struct" 449 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n"); 450 return -ENODEV; 451 } 452 /* 453 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device 454 * reference, we enforce that udev_path has been set 455 */ 456 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) { 457 pr_err("pSCSI: udev_path attribute has not" 458 " been set before ENABLE=1\n"); 459 return -EINVAL; 460 } 461 /* 462 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID, 463 * use the original TCM hba ID to reference Linux/SCSI Host No 464 * and enable for PHV_LLD_SCSI_HOST_NO mode. 465 */ 466 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) { 467 if (hba->dev_count) { 468 pr_err("pSCSI: Unable to set hba_mode" 469 " with active devices\n"); 470 return -EEXIST; 471 } 472 473 if (pscsi_pmode_enable_hba(hba, 1) != 1) 474 return -ENODEV; 475 476 legacy_mode_enable = 1; 477 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE; 478 sh = phv->phv_lld_host; 479 } else { 480 sh = scsi_host_lookup(pdv->pdv_host_id); 481 if (!sh) { 482 pr_err("pSCSI: Unable to locate" 483 " pdv_host_id: %d\n", pdv->pdv_host_id); 484 return -EINVAL; 485 } 486 pdv->pdv_lld_host = sh; 487 } 488 } else { 489 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) { 490 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while" 491 " struct Scsi_Host exists\n"); 492 return -EEXIST; 493 } 494 } 495 496 spin_lock_irq(sh->host_lock); 497 list_for_each_entry(sd, &sh->__devices, siblings) { 498 if ((pdv->pdv_channel_id != sd->channel) || 499 (pdv->pdv_target_id != sd->id) || 500 (pdv->pdv_lun_id != sd->lun)) 501 continue; 502 /* 503 * Functions will release the held struct scsi_host->host_lock 504 * before calling calling pscsi_add_device_to_list() to register 505 * struct scsi_device with target_core_mod. 506 */ 507 switch (sd->type) { 508 case TYPE_DISK: 509 case TYPE_ZBC: 510 ret = pscsi_create_type_disk(dev, sd); 511 break; 512 default: 513 ret = pscsi_create_type_nondisk(dev, sd); 514 break; 515 } 516 517 if (ret) { 518 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 519 scsi_host_put(sh); 520 else if (legacy_mode_enable) { 521 pscsi_pmode_enable_hba(hba, 0); 522 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 523 } 524 pdv->pdv_sd = NULL; 525 return ret; 526 } 527 return 0; 528 } 529 spin_unlock_irq(sh->host_lock); 530 531 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no, 532 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id); 533 534 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 535 scsi_host_put(sh); 536 else if (legacy_mode_enable) { 537 pscsi_pmode_enable_hba(hba, 0); 538 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 539 } 540 541 return -ENODEV; 542 } 543 544 static void pscsi_dev_call_rcu(struct rcu_head *p) 545 { 546 struct se_device *dev = container_of(p, struct se_device, rcu_head); 547 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 548 549 kfree(pdv); 550 } 551 552 static void pscsi_free_device(struct se_device *dev) 553 { 554 call_rcu(&dev->rcu_head, pscsi_dev_call_rcu); 555 } 556 557 static void pscsi_destroy_device(struct se_device *dev) 558 { 559 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 560 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 561 struct scsi_device *sd = pdv->pdv_sd; 562 563 if (sd) { 564 /* 565 * Release exclusive pSCSI internal struct block_device claim for 566 * struct scsi_device with TYPE_DISK or TYPE_ZBC 567 * from pscsi_create_type_disk() 568 */ 569 if ((sd->type == TYPE_DISK || sd->type == TYPE_ZBC) && 570 pdv->pdv_bd) { 571 blkdev_put(pdv->pdv_bd, 572 FMODE_WRITE|FMODE_READ|FMODE_EXCL); 573 pdv->pdv_bd = NULL; 574 } 575 /* 576 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference 577 * to struct Scsi_Host now. 578 */ 579 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) && 580 (phv->phv_lld_host != NULL)) 581 scsi_host_put(phv->phv_lld_host); 582 else if (pdv->pdv_lld_host) 583 scsi_host_put(pdv->pdv_lld_host); 584 585 scsi_device_put(sd); 586 587 pdv->pdv_sd = NULL; 588 } 589 } 590 591 static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status, 592 unsigned char *req_sense) 593 { 594 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); 595 struct scsi_device *sd = pdv->pdv_sd; 596 struct pscsi_plugin_task *pt = cmd->priv; 597 unsigned char *cdb; 598 /* 599 * Special case for REPORT_LUNs handling where pscsi_plugin_task has 600 * not been allocated because TCM is handling the emulation directly. 601 */ 602 if (!pt) 603 return; 604 605 cdb = &pt->pscsi_cdb[0]; 606 /* 607 * Hack to make sure that Write-Protect modepage is set if R/O mode is 608 * forced. 609 */ 610 if (!cmd->data_length) 611 goto after_mode_sense; 612 613 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) && 614 scsi_status == SAM_STAT_GOOD) { 615 bool read_only = target_lun_is_rdonly(cmd); 616 617 if (read_only) { 618 unsigned char *buf; 619 620 buf = transport_kmap_data_sg(cmd); 621 if (!buf) { 622 ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */ 623 } else { 624 if (cdb[0] == MODE_SENSE_10) { 625 if (!(buf[3] & 0x80)) 626 buf[3] |= 0x80; 627 } else { 628 if (!(buf[2] & 0x80)) 629 buf[2] |= 0x80; 630 } 631 632 transport_kunmap_data_sg(cmd); 633 } 634 } 635 } 636 after_mode_sense: 637 638 if (sd->type != TYPE_TAPE || !cmd->data_length) 639 goto after_mode_select; 640 641 /* 642 * Hack to correctly obtain the initiator requested blocksize for 643 * TYPE_TAPE. Since this value is dependent upon each tape media, 644 * struct scsi_device->sector_size will not contain the correct value 645 * by default, so we go ahead and set it so 646 * TRANSPORT(dev)->get_blockdev() returns the correct value to the 647 * storage engine. 648 */ 649 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) && 650 scsi_status == SAM_STAT_GOOD) { 651 unsigned char *buf; 652 u16 bdl; 653 u32 blocksize; 654 655 buf = sg_virt(&cmd->t_data_sg[0]); 656 if (!buf) { 657 pr_err("Unable to get buf for scatterlist\n"); 658 goto after_mode_select; 659 } 660 661 if (cdb[0] == MODE_SELECT) 662 bdl = buf[3]; 663 else 664 bdl = get_unaligned_be16(&buf[6]); 665 666 if (!bdl) 667 goto after_mode_select; 668 669 if (cdb[0] == MODE_SELECT) 670 blocksize = get_unaligned_be24(&buf[9]); 671 else 672 blocksize = get_unaligned_be24(&buf[13]); 673 674 sd->sector_size = blocksize; 675 } 676 after_mode_select: 677 678 if (scsi_status == SAM_STAT_CHECK_CONDITION) { 679 transport_copy_sense_to_cmd(cmd, req_sense); 680 681 /* 682 * check for TAPE device reads with 683 * FM/EOM/ILI set, so that we can get data 684 * back despite framework assumption that a 685 * check condition means there is no data 686 */ 687 if (sd->type == TYPE_TAPE && 688 cmd->data_direction == DMA_FROM_DEVICE) { 689 /* 690 * is sense data valid, fixed format, 691 * and have FM, EOM, or ILI set? 692 */ 693 if (req_sense[0] == 0xf0 && /* valid, fixed format */ 694 req_sense[2] & 0xe0 && /* FM, EOM, or ILI */ 695 (req_sense[2] & 0xf) == 0) { /* key==NO_SENSE */ 696 pr_debug("Tape FM/EOM/ILI status detected. Treat as normal read.\n"); 697 cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; 698 } 699 } 700 } 701 } 702 703 enum { 704 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id, 705 Opt_scsi_lun_id, Opt_err 706 }; 707 708 static match_table_t tokens = { 709 {Opt_scsi_host_id, "scsi_host_id=%d"}, 710 {Opt_scsi_channel_id, "scsi_channel_id=%d"}, 711 {Opt_scsi_target_id, "scsi_target_id=%d"}, 712 {Opt_scsi_lun_id, "scsi_lun_id=%d"}, 713 {Opt_err, NULL} 714 }; 715 716 static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev, 717 const char *page, ssize_t count) 718 { 719 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 720 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 721 char *orig, *ptr, *opts; 722 substring_t args[MAX_OPT_ARGS]; 723 int ret = 0, arg, token; 724 725 opts = kstrdup(page, GFP_KERNEL); 726 if (!opts) 727 return -ENOMEM; 728 729 orig = opts; 730 731 while ((ptr = strsep(&opts, ",\n")) != NULL) { 732 if (!*ptr) 733 continue; 734 735 token = match_token(ptr, tokens, args); 736 switch (token) { 737 case Opt_scsi_host_id: 738 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 739 pr_err("PSCSI[%d]: Unable to accept" 740 " scsi_host_id while phv_mode ==" 741 " PHV_LLD_SCSI_HOST_NO\n", 742 phv->phv_host_id); 743 ret = -EINVAL; 744 goto out; 745 } 746 ret = match_int(args, &arg); 747 if (ret) 748 goto out; 749 pdv->pdv_host_id = arg; 750 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:" 751 " %d\n", phv->phv_host_id, pdv->pdv_host_id); 752 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID; 753 break; 754 case Opt_scsi_channel_id: 755 ret = match_int(args, &arg); 756 if (ret) 757 goto out; 758 pdv->pdv_channel_id = arg; 759 pr_debug("PSCSI[%d]: Referencing SCSI Channel" 760 " ID: %d\n", phv->phv_host_id, 761 pdv->pdv_channel_id); 762 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID; 763 break; 764 case Opt_scsi_target_id: 765 ret = match_int(args, &arg); 766 if (ret) 767 goto out; 768 pdv->pdv_target_id = arg; 769 pr_debug("PSCSI[%d]: Referencing SCSI Target" 770 " ID: %d\n", phv->phv_host_id, 771 pdv->pdv_target_id); 772 pdv->pdv_flags |= PDF_HAS_TARGET_ID; 773 break; 774 case Opt_scsi_lun_id: 775 ret = match_int(args, &arg); 776 if (ret) 777 goto out; 778 pdv->pdv_lun_id = arg; 779 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:" 780 " %d\n", phv->phv_host_id, pdv->pdv_lun_id); 781 pdv->pdv_flags |= PDF_HAS_LUN_ID; 782 break; 783 default: 784 break; 785 } 786 } 787 788 out: 789 kfree(orig); 790 return (!ret) ? count : ret; 791 } 792 793 static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b) 794 { 795 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 796 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 797 struct scsi_device *sd = pdv->pdv_sd; 798 unsigned char host_id[16]; 799 ssize_t bl; 800 801 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 802 snprintf(host_id, 16, "%d", pdv->pdv_host_id); 803 else 804 snprintf(host_id, 16, "PHBA Mode"); 805 806 bl = sprintf(b, "SCSI Device Bus Location:" 807 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n", 808 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id, 809 host_id); 810 811 if (sd) { 812 bl += sprintf(b + bl, " Vendor: %." 813 __stringify(INQUIRY_VENDOR_LEN) "s", sd->vendor); 814 bl += sprintf(b + bl, " Model: %." 815 __stringify(INQUIRY_MODEL_LEN) "s", sd->model); 816 bl += sprintf(b + bl, " Rev: %." 817 __stringify(INQUIRY_REVISION_LEN) "s\n", sd->rev); 818 } 819 return bl; 820 } 821 822 static void pscsi_bi_endio(struct bio *bio) 823 { 824 bio_put(bio); 825 } 826 827 static inline struct bio *pscsi_get_bio(int nr_vecs) 828 { 829 struct bio *bio; 830 /* 831 * Use bio_malloc() following the comment in for bio -> struct request 832 * in block/blk-core.c:blk_make_request() 833 */ 834 bio = bio_kmalloc(GFP_KERNEL, nr_vecs); 835 if (!bio) { 836 pr_err("PSCSI: bio_kmalloc() failed\n"); 837 return NULL; 838 } 839 bio->bi_end_io = pscsi_bi_endio; 840 841 return bio; 842 } 843 844 static sense_reason_t 845 pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 846 struct request *req) 847 { 848 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); 849 struct bio *bio = NULL; 850 struct page *page; 851 struct scatterlist *sg; 852 u32 data_len = cmd->data_length, i, len, bytes, off; 853 int nr_pages = (cmd->data_length + sgl[0].offset + 854 PAGE_SIZE - 1) >> PAGE_SHIFT; 855 int nr_vecs = 0, rc; 856 int rw = (cmd->data_direction == DMA_TO_DEVICE); 857 858 BUG_ON(!cmd->data_length); 859 860 pr_debug("PSCSI: nr_pages: %d\n", nr_pages); 861 862 for_each_sg(sgl, sg, sgl_nents, i) { 863 page = sg_page(sg); 864 off = sg->offset; 865 len = sg->length; 866 867 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i, 868 page, len, off); 869 870 /* 871 * We only have one page of data in each sg element, 872 * we can not cross a page boundary. 873 */ 874 if (off + len > PAGE_SIZE) 875 goto fail; 876 877 if (len > 0 && data_len > 0) { 878 bytes = min_t(unsigned int, len, PAGE_SIZE - off); 879 bytes = min(bytes, data_len); 880 881 if (!bio) { 882 new_bio: 883 nr_vecs = bio_max_segs(nr_pages); 884 /* 885 * Calls bio_kmalloc() and sets bio->bi_end_io() 886 */ 887 bio = pscsi_get_bio(nr_vecs); 888 if (!bio) 889 goto fail; 890 891 if (rw) 892 bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 893 894 pr_debug("PSCSI: Allocated bio: %p," 895 " dir: %s nr_vecs: %d\n", bio, 896 (rw) ? "rw" : "r", nr_vecs); 897 } 898 899 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d" 900 " bio: %p page: %p len: %d off: %d\n", i, bio, 901 page, len, off); 902 903 rc = bio_add_pc_page(pdv->pdv_sd->request_queue, 904 bio, page, bytes, off); 905 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n", 906 bio_segments(bio), nr_vecs); 907 if (rc != bytes) { 908 pr_debug("PSCSI: Reached bio->bi_vcnt max:" 909 " %d i: %d bio: %p, allocating another" 910 " bio\n", bio->bi_vcnt, i, bio); 911 912 rc = blk_rq_append_bio(req, bio); 913 if (rc) { 914 pr_err("pSCSI: failed to append bio\n"); 915 goto fail; 916 } 917 918 /* 919 * Clear the pointer so that another bio will 920 * be allocated with pscsi_get_bio() above. 921 */ 922 bio = NULL; 923 goto new_bio; 924 } 925 926 data_len -= bytes; 927 } 928 } 929 930 if (bio) { 931 rc = blk_rq_append_bio(req, bio); 932 if (rc) { 933 pr_err("pSCSI: failed to append bio\n"); 934 goto fail; 935 } 936 } 937 938 return 0; 939 fail: 940 if (bio) 941 bio_put(bio); 942 while (req->bio) { 943 bio = req->bio; 944 req->bio = bio->bi_next; 945 bio_put(bio); 946 } 947 req->biotail = NULL; 948 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 949 } 950 951 static sense_reason_t 952 pscsi_parse_cdb(struct se_cmd *cmd) 953 { 954 if (cmd->se_cmd_flags & SCF_BIDI) 955 return TCM_UNSUPPORTED_SCSI_OPCODE; 956 957 return passthrough_parse_cdb(cmd, pscsi_execute_cmd); 958 } 959 960 static sense_reason_t 961 pscsi_execute_cmd(struct se_cmd *cmd) 962 { 963 struct scatterlist *sgl = cmd->t_data_sg; 964 u32 sgl_nents = cmd->t_data_nents; 965 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); 966 struct pscsi_plugin_task *pt; 967 struct request *req; 968 sense_reason_t ret; 969 970 /* 971 * Dynamically alloc cdb space, since it may be larger than 972 * TCM_MAX_COMMAND_SIZE 973 */ 974 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL); 975 if (!pt) { 976 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 977 } 978 cmd->priv = pt; 979 980 memcpy(pt->pscsi_cdb, cmd->t_task_cdb, 981 scsi_command_size(cmd->t_task_cdb)); 982 983 req = scsi_alloc_request(pdv->pdv_sd->request_queue, 984 cmd->data_direction == DMA_TO_DEVICE ? 985 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); 986 if (IS_ERR(req)) { 987 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 988 goto fail; 989 } 990 991 if (sgl) { 992 ret = pscsi_map_sg(cmd, sgl, sgl_nents, req); 993 if (ret) 994 goto fail_put_request; 995 } 996 997 req->end_io = pscsi_req_done; 998 req->end_io_data = cmd; 999 scsi_req(req)->cmd_len = scsi_command_size(pt->pscsi_cdb); 1000 scsi_req(req)->cmd = &pt->pscsi_cdb[0]; 1001 if (pdv->pdv_sd->type == TYPE_DISK || 1002 pdv->pdv_sd->type == TYPE_ZBC) 1003 req->timeout = PS_TIMEOUT_DISK; 1004 else 1005 req->timeout = PS_TIMEOUT_OTHER; 1006 scsi_req(req)->retries = PS_RETRY; 1007 1008 blk_execute_rq_nowait(NULL, req, (cmd->sam_task_attr == TCM_HEAD_TAG), 1009 pscsi_req_done); 1010 1011 return 0; 1012 1013 fail_put_request: 1014 blk_mq_free_request(req); 1015 fail: 1016 kfree(pt); 1017 return ret; 1018 } 1019 1020 /* pscsi_get_device_type(): 1021 * 1022 * 1023 */ 1024 static u32 pscsi_get_device_type(struct se_device *dev) 1025 { 1026 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 1027 struct scsi_device *sd = pdv->pdv_sd; 1028 1029 return (sd) ? sd->type : TYPE_NO_LUN; 1030 } 1031 1032 static sector_t pscsi_get_blocks(struct se_device *dev) 1033 { 1034 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 1035 1036 if (pdv->pdv_bd) 1037 return bdev_nr_sectors(pdv->pdv_bd); 1038 return 0; 1039 } 1040 1041 static void pscsi_req_done(struct request *req, blk_status_t status) 1042 { 1043 struct se_cmd *cmd = req->end_io_data; 1044 struct pscsi_plugin_task *pt = cmd->priv; 1045 int result = scsi_req(req)->result; 1046 enum sam_status scsi_status = result & 0xff; 1047 1048 if (scsi_status != SAM_STAT_GOOD) { 1049 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:" 1050 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], 1051 result); 1052 } 1053 1054 pscsi_complete_cmd(cmd, scsi_status, scsi_req(req)->sense); 1055 1056 switch (host_byte(result)) { 1057 case DID_OK: 1058 target_complete_cmd_with_length(cmd, scsi_status, 1059 cmd->data_length - scsi_req(req)->resid_len); 1060 break; 1061 default: 1062 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:" 1063 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], 1064 result); 1065 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 1066 break; 1067 } 1068 1069 blk_mq_free_request(req); 1070 kfree(pt); 1071 } 1072 1073 static const struct target_backend_ops pscsi_ops = { 1074 .name = "pscsi", 1075 .owner = THIS_MODULE, 1076 .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH | 1077 TRANSPORT_FLAG_PASSTHROUGH_ALUA | 1078 TRANSPORT_FLAG_PASSTHROUGH_PGR, 1079 .attach_hba = pscsi_attach_hba, 1080 .detach_hba = pscsi_detach_hba, 1081 .pmode_enable_hba = pscsi_pmode_enable_hba, 1082 .alloc_device = pscsi_alloc_device, 1083 .configure_device = pscsi_configure_device, 1084 .destroy_device = pscsi_destroy_device, 1085 .free_device = pscsi_free_device, 1086 .parse_cdb = pscsi_parse_cdb, 1087 .set_configfs_dev_params = pscsi_set_configfs_dev_params, 1088 .show_configfs_dev_params = pscsi_show_configfs_dev_params, 1089 .get_device_type = pscsi_get_device_type, 1090 .get_blocks = pscsi_get_blocks, 1091 .tb_dev_attrib_attrs = passthrough_attrib_attrs, 1092 }; 1093 1094 static int __init pscsi_module_init(void) 1095 { 1096 return transport_backend_register(&pscsi_ops); 1097 } 1098 1099 static void __exit pscsi_module_exit(void) 1100 { 1101 target_backend_unregister(&pscsi_ops); 1102 } 1103 1104 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin"); 1105 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 1106 MODULE_LICENSE("GPL"); 1107 1108 module_init(pscsi_module_init); 1109 module_exit(pscsi_module_exit); 1110