1// SPDX-License-Identifier: GPL-2.0-or-later 2/******************************************************************************* 3 * Filename: target_core_transport.c 4 * 5 * This file contains the Generic Target Engine Core. 6 * 7 * (c) Copyright 2002-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 ******************************************************************************/ 12 13#include <linux/net.h> 14#include <linux/delay.h> 15#include <linux/string.h> 16#include <linux/timer.h> 17#include <linux/slab.h> 18#include <linux/spinlock.h> 19#include <linux/kthread.h> 20#include <linux/in.h> 21#include <linux/cdrom.h> 22#include <linux/module.h> 23#include <linux/ratelimit.h> 24#include <linux/vmalloc.h> 25#include <asm/unaligned.h> 26#include <net/sock.h> 27#include <net/tcp.h> 28#include <scsi/scsi_proto.h> 29#include <scsi/scsi_common.h> 30 31#include <target/target_core_base.h> 32#include <target/target_core_backend.h> 33#include <target/target_core_fabric.h> 34 35#include "target_core_internal.h" 36#include "target_core_alua.h" 37#include "target_core_pr.h" 38#include "target_core_ua.h" 39 40#define CREATE_TRACE_POINTS 41#include <trace/events/target.h> 42 43static struct workqueue_struct *target_completion_wq; 44static struct workqueue_struct *target_submission_wq; 45static struct kmem_cache *se_sess_cache; 46struct kmem_cache *se_ua_cache; 47struct kmem_cache *t10_pr_reg_cache; 48struct kmem_cache *t10_alua_lu_gp_cache; 49struct kmem_cache *t10_alua_lu_gp_mem_cache; 50struct kmem_cache *t10_alua_tg_pt_gp_cache; 51struct kmem_cache *t10_alua_lba_map_cache; 52struct kmem_cache *t10_alua_lba_map_mem_cache; 53 54static void transport_complete_task_attr(struct se_cmd *cmd); 55static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason); 56static void transport_handle_queue_full(struct se_cmd *cmd, 57 struct se_device *dev, int err, bool write_pending); 58static void target_complete_ok_work(struct work_struct *work); 59 60int init_se_kmem_caches(void) 61{ 62 se_sess_cache = kmem_cache_create("se_sess_cache", 63 sizeof(struct se_session), __alignof__(struct se_session), 64 0, NULL); 65 if (!se_sess_cache) { 66 pr_err("kmem_cache_create() for struct se_session" 67 " failed\n"); 68 goto out; 69 } 70 se_ua_cache = kmem_cache_create("se_ua_cache", 71 sizeof(struct se_ua), __alignof__(struct se_ua), 72 0, NULL); 73 if (!se_ua_cache) { 74 pr_err("kmem_cache_create() for struct se_ua failed\n"); 75 goto out_free_sess_cache; 76 } 77 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", 78 sizeof(struct t10_pr_registration), 79 __alignof__(struct t10_pr_registration), 0, NULL); 80 if (!t10_pr_reg_cache) { 81 pr_err("kmem_cache_create() for struct t10_pr_registration" 82 " failed\n"); 83 goto out_free_ua_cache; 84 } 85 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", 86 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), 87 0, NULL); 88 if (!t10_alua_lu_gp_cache) { 89 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" 90 " failed\n"); 91 goto out_free_pr_reg_cache; 92 } 93 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", 94 sizeof(struct t10_alua_lu_gp_member), 95 __alignof__(struct t10_alua_lu_gp_member), 0, NULL); 96 if (!t10_alua_lu_gp_mem_cache) { 97 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" 98 "cache failed\n"); 99 goto out_free_lu_gp_cache; 100 } 101 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", 102 sizeof(struct t10_alua_tg_pt_gp), 103 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); 104 if (!t10_alua_tg_pt_gp_cache) { 105 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" 106 "cache failed\n"); 107 goto out_free_lu_gp_mem_cache; 108 } 109 t10_alua_lba_map_cache = kmem_cache_create( 110 "t10_alua_lba_map_cache", 111 sizeof(struct t10_alua_lba_map), 112 __alignof__(struct t10_alua_lba_map), 0, NULL); 113 if (!t10_alua_lba_map_cache) { 114 pr_err("kmem_cache_create() for t10_alua_lba_map_" 115 "cache failed\n"); 116 goto out_free_tg_pt_gp_cache; 117 } 118 t10_alua_lba_map_mem_cache = kmem_cache_create( 119 "t10_alua_lba_map_mem_cache", 120 sizeof(struct t10_alua_lba_map_member), 121 __alignof__(struct t10_alua_lba_map_member), 0, NULL); 122 if (!t10_alua_lba_map_mem_cache) { 123 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" 124 "cache failed\n"); 125 goto out_free_lba_map_cache; 126 } 127 128 target_completion_wq = alloc_workqueue("target_completion", 129 WQ_MEM_RECLAIM, 0); 130 if (!target_completion_wq) 131 goto out_free_lba_map_mem_cache; 132 133 target_submission_wq = alloc_workqueue("target_submission", 134 WQ_MEM_RECLAIM, 0); 135 if (!target_submission_wq) 136 goto out_free_completion_wq; 137 138 return 0; 139 140out_free_completion_wq: 141 destroy_workqueue(target_completion_wq); 142out_free_lba_map_mem_cache: 143 kmem_cache_destroy(t10_alua_lba_map_mem_cache); 144out_free_lba_map_cache: 145 kmem_cache_destroy(t10_alua_lba_map_cache); 146out_free_tg_pt_gp_cache: 147 kmem_cache_destroy(t10_alua_tg_pt_gp_cache); 148out_free_lu_gp_mem_cache: 149 kmem_cache_destroy(t10_alua_lu_gp_mem_cache); 150out_free_lu_gp_cache: 151 kmem_cache_destroy(t10_alua_lu_gp_cache); 152out_free_pr_reg_cache: 153 kmem_cache_destroy(t10_pr_reg_cache); 154out_free_ua_cache: 155 kmem_cache_destroy(se_ua_cache); 156out_free_sess_cache: 157 kmem_cache_destroy(se_sess_cache); 158out: 159 return -ENOMEM; 160} 161 162void release_se_kmem_caches(void) 163{ 164 destroy_workqueue(target_submission_wq); 165 destroy_workqueue(target_completion_wq); 166 kmem_cache_destroy(se_sess_cache); 167 kmem_cache_destroy(se_ua_cache); 168 kmem_cache_destroy(t10_pr_reg_cache); 169 kmem_cache_destroy(t10_alua_lu_gp_cache); 170 kmem_cache_destroy(t10_alua_lu_gp_mem_cache); 171 kmem_cache_destroy(t10_alua_tg_pt_gp_cache); 172 kmem_cache_destroy(t10_alua_lba_map_cache); 173 kmem_cache_destroy(t10_alua_lba_map_mem_cache); 174} 175 176/* This code ensures unique mib indexes are handed out. */ 177static DEFINE_SPINLOCK(scsi_mib_index_lock); 178static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; 179 180/* 181 * Allocate a new row index for the entry type specified 182 */ 183u32 scsi_get_new_index(scsi_index_t type) 184{ 185 u32 new_index; 186 187 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); 188 189 spin_lock(&scsi_mib_index_lock); 190 new_index = ++scsi_mib_index[type]; 191 spin_unlock(&scsi_mib_index_lock); 192 193 return new_index; 194} 195 196void transport_subsystem_check_init(void) 197{ 198 int ret; 199 static int sub_api_initialized; 200 201 if (sub_api_initialized) 202 return; 203 204 ret = IS_ENABLED(CONFIG_TCM_IBLOCK) && request_module("target_core_iblock"); 205 if (ret != 0) 206 pr_err("Unable to load target_core_iblock\n"); 207 208 ret = IS_ENABLED(CONFIG_TCM_FILEIO) && request_module("target_core_file"); 209 if (ret != 0) 210 pr_err("Unable to load target_core_file\n"); 211 212 ret = IS_ENABLED(CONFIG_TCM_PSCSI) && request_module("target_core_pscsi"); 213 if (ret != 0) 214 pr_err("Unable to load target_core_pscsi\n"); 215 216 ret = IS_ENABLED(CONFIG_TCM_USER2) && request_module("target_core_user"); 217 if (ret != 0) 218 pr_err("Unable to load target_core_user\n"); 219 220 sub_api_initialized = 1; 221} 222 223static void target_release_cmd_refcnt(struct percpu_ref *ref) 224{ 225 struct target_cmd_counter *cmd_cnt = container_of(ref, 226 typeof(*cmd_cnt), 227 refcnt); 228 wake_up(&cmd_cnt->refcnt_wq); 229} 230 231struct target_cmd_counter *target_alloc_cmd_counter(void) 232{ 233 struct target_cmd_counter *cmd_cnt; 234 int rc; 235 236 cmd_cnt = kzalloc(sizeof(*cmd_cnt), GFP_KERNEL); 237 if (!cmd_cnt) 238 return NULL; 239 240 init_completion(&cmd_cnt->stop_done); 241 init_waitqueue_head(&cmd_cnt->refcnt_wq); 242 atomic_set(&cmd_cnt->stopped, 0); 243 244 rc = percpu_ref_init(&cmd_cnt->refcnt, target_release_cmd_refcnt, 0, 245 GFP_KERNEL); 246 if (rc) 247 goto free_cmd_cnt; 248 249 return cmd_cnt; 250 251free_cmd_cnt: 252 kfree(cmd_cnt); 253 return NULL; 254} 255EXPORT_SYMBOL_GPL(target_alloc_cmd_counter); 256 257void target_free_cmd_counter(struct target_cmd_counter *cmd_cnt) 258{ 259 /* 260 * Drivers like loop do not call target_stop_session during session 261 * shutdown so we have to drop the ref taken at init time here. 262 */ 263 if (!atomic_read(&cmd_cnt->stopped)) 264 percpu_ref_put(&cmd_cnt->refcnt); 265 266 percpu_ref_exit(&cmd_cnt->refcnt); 267 kfree(cmd_cnt); 268} 269EXPORT_SYMBOL_GPL(target_free_cmd_counter); 270 271/** 272 * transport_init_session - initialize a session object 273 * @se_sess: Session object pointer. 274 * 275 * The caller must have zero-initialized @se_sess before calling this function. 276 */ 277void transport_init_session(struct se_session *se_sess) 278{ 279 INIT_LIST_HEAD(&se_sess->sess_list); 280 INIT_LIST_HEAD(&se_sess->sess_acl_list); 281 spin_lock_init(&se_sess->sess_cmd_lock); 282} 283EXPORT_SYMBOL(transport_init_session); 284 285/** 286 * transport_alloc_session - allocate a session object and initialize it 287 * @sup_prot_ops: bitmask that defines which T10-PI modes are supported. 288 */ 289struct se_session *transport_alloc_session(enum target_prot_op sup_prot_ops) 290{ 291 struct se_session *se_sess; 292 293 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); 294 if (!se_sess) { 295 pr_err("Unable to allocate struct se_session from" 296 " se_sess_cache\n"); 297 return ERR_PTR(-ENOMEM); 298 } 299 transport_init_session(se_sess); 300 se_sess->sup_prot_ops = sup_prot_ops; 301 302 return se_sess; 303} 304EXPORT_SYMBOL(transport_alloc_session); 305 306/** 307 * transport_alloc_session_tags - allocate target driver private data 308 * @se_sess: Session pointer. 309 * @tag_num: Maximum number of in-flight commands between initiator and target. 310 * @tag_size: Size in bytes of the private data a target driver associates with 311 * each command. 312 */ 313int transport_alloc_session_tags(struct se_session *se_sess, 314 unsigned int tag_num, unsigned int tag_size) 315{ 316 int rc; 317 318 se_sess->sess_cmd_map = kvcalloc(tag_size, tag_num, 319 GFP_KERNEL | __GFP_RETRY_MAYFAIL); 320 if (!se_sess->sess_cmd_map) { 321 pr_err("Unable to allocate se_sess->sess_cmd_map\n"); 322 return -ENOMEM; 323 } 324 325 rc = sbitmap_queue_init_node(&se_sess->sess_tag_pool, tag_num, -1, 326 false, GFP_KERNEL, NUMA_NO_NODE); 327 if (rc < 0) { 328 pr_err("Unable to init se_sess->sess_tag_pool," 329 " tag_num: %u\n", tag_num); 330 kvfree(se_sess->sess_cmd_map); 331 se_sess->sess_cmd_map = NULL; 332 return -ENOMEM; 333 } 334 335 return 0; 336} 337EXPORT_SYMBOL(transport_alloc_session_tags); 338 339/** 340 * transport_init_session_tags - allocate a session and target driver private data 341 * @tag_num: Maximum number of in-flight commands between initiator and target. 342 * @tag_size: Size in bytes of the private data a target driver associates with 343 * each command. 344 * @sup_prot_ops: bitmask that defines which T10-PI modes are supported. 345 */ 346static struct se_session * 347transport_init_session_tags(unsigned int tag_num, unsigned int tag_size, 348 enum target_prot_op sup_prot_ops) 349{ 350 struct se_session *se_sess; 351 int rc; 352 353 if (tag_num != 0 && !tag_size) { 354 pr_err("init_session_tags called with percpu-ida tag_num:" 355 " %u, but zero tag_size\n", tag_num); 356 return ERR_PTR(-EINVAL); 357 } 358 if (!tag_num && tag_size) { 359 pr_err("init_session_tags called with percpu-ida tag_size:" 360 " %u, but zero tag_num\n", tag_size); 361 return ERR_PTR(-EINVAL); 362 } 363 364 se_sess = transport_alloc_session(sup_prot_ops); 365 if (IS_ERR(se_sess)) 366 return se_sess; 367 368 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); 369 if (rc < 0) { 370 transport_free_session(se_sess); 371 return ERR_PTR(-ENOMEM); 372 } 373 374 return se_sess; 375} 376 377/* 378 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. 379 */ 380void __transport_register_session( 381 struct se_portal_group *se_tpg, 382 struct se_node_acl *se_nacl, 383 struct se_session *se_sess, 384 void *fabric_sess_ptr) 385{ 386 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; 387 unsigned char buf[PR_REG_ISID_LEN]; 388 unsigned long flags; 389 390 se_sess->se_tpg = se_tpg; 391 se_sess->fabric_sess_ptr = fabric_sess_ptr; 392 /* 393 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t 394 * 395 * Only set for struct se_session's that will actually be moving I/O. 396 * eg: *NOT* discovery sessions. 397 */ 398 if (se_nacl) { 399 /* 400 * 401 * Determine if fabric allows for T10-PI feature bits exposed to 402 * initiators for device backends with !dev->dev_attrib.pi_prot_type. 403 * 404 * If so, then always save prot_type on a per se_node_acl node 405 * basis and re-instate the previous sess_prot_type to avoid 406 * disabling PI from below any previously initiator side 407 * registered LUNs. 408 */ 409 if (se_nacl->saved_prot_type) 410 se_sess->sess_prot_type = se_nacl->saved_prot_type; 411 else if (tfo->tpg_check_prot_fabric_only) 412 se_sess->sess_prot_type = se_nacl->saved_prot_type = 413 tfo->tpg_check_prot_fabric_only(se_tpg); 414 /* 415 * If the fabric module supports an ISID based TransportID, 416 * save this value in binary from the fabric I_T Nexus now. 417 */ 418 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 419 memset(&buf[0], 0, PR_REG_ISID_LEN); 420 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, 421 &buf[0], PR_REG_ISID_LEN); 422 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); 423 } 424 425 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); 426 /* 427 * The se_nacl->nacl_sess pointer will be set to the 428 * last active I_T Nexus for each struct se_node_acl. 429 */ 430 se_nacl->nacl_sess = se_sess; 431 432 list_add_tail(&se_sess->sess_acl_list, 433 &se_nacl->acl_sess_list); 434 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); 435 } 436 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); 437 438 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", 439 se_tpg->se_tpg_tfo->fabric_name, se_sess->fabric_sess_ptr); 440} 441EXPORT_SYMBOL(__transport_register_session); 442 443void transport_register_session( 444 struct se_portal_group *se_tpg, 445 struct se_node_acl *se_nacl, 446 struct se_session *se_sess, 447 void *fabric_sess_ptr) 448{ 449 unsigned long flags; 450 451 spin_lock_irqsave(&se_tpg->session_lock, flags); 452 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); 453 spin_unlock_irqrestore(&se_tpg->session_lock, flags); 454} 455EXPORT_SYMBOL(transport_register_session); 456 457struct se_session * 458target_setup_session(struct se_portal_group *tpg, 459 unsigned int tag_num, unsigned int tag_size, 460 enum target_prot_op prot_op, 461 const char *initiatorname, void *private, 462 int (*callback)(struct se_portal_group *, 463 struct se_session *, void *)) 464{ 465 struct target_cmd_counter *cmd_cnt; 466 struct se_session *sess; 467 int rc; 468 469 cmd_cnt = target_alloc_cmd_counter(); 470 if (!cmd_cnt) 471 return ERR_PTR(-ENOMEM); 472 /* 473 * If the fabric driver is using percpu-ida based pre allocation 474 * of I/O descriptor tags, go ahead and perform that setup now.. 475 */ 476 if (tag_num != 0) 477 sess = transport_init_session_tags(tag_num, tag_size, prot_op); 478 else 479 sess = transport_alloc_session(prot_op); 480 481 if (IS_ERR(sess)) { 482 rc = PTR_ERR(sess); 483 goto free_cnt; 484 } 485 sess->cmd_cnt = cmd_cnt; 486 487 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg, 488 (unsigned char *)initiatorname); 489 if (!sess->se_node_acl) { 490 rc = -EACCES; 491 goto free_sess; 492 } 493 /* 494 * Go ahead and perform any remaining fabric setup that is 495 * required before transport_register_session(). 496 */ 497 if (callback != NULL) { 498 rc = callback(tpg, sess, private); 499 if (rc) 500 goto free_sess; 501 } 502 503 transport_register_session(tpg, sess->se_node_acl, sess, private); 504 return sess; 505 506free_sess: 507 transport_free_session(sess); 508 return ERR_PTR(rc); 509 510free_cnt: 511 target_free_cmd_counter(cmd_cnt); 512 return ERR_PTR(rc); 513} 514EXPORT_SYMBOL(target_setup_session); 515 516ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page) 517{ 518 struct se_session *se_sess; 519 ssize_t len = 0; 520 521 spin_lock_bh(&se_tpg->session_lock); 522 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) { 523 if (!se_sess->se_node_acl) 524 continue; 525 if (!se_sess->se_node_acl->dynamic_node_acl) 526 continue; 527 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE) 528 break; 529 530 len += snprintf(page + len, PAGE_SIZE - len, "%s\n", 531 se_sess->se_node_acl->initiatorname); 532 len += 1; /* Include NULL terminator */ 533 } 534 spin_unlock_bh(&se_tpg->session_lock); 535 536 return len; 537} 538EXPORT_SYMBOL(target_show_dynamic_sessions); 539 540static void target_complete_nacl(struct kref *kref) 541{ 542 struct se_node_acl *nacl = container_of(kref, 543 struct se_node_acl, acl_kref); 544 struct se_portal_group *se_tpg = nacl->se_tpg; 545 546 if (!nacl->dynamic_stop) { 547 complete(&nacl->acl_free_comp); 548 return; 549 } 550 551 mutex_lock(&se_tpg->acl_node_mutex); 552 list_del_init(&nacl->acl_list); 553 mutex_unlock(&se_tpg->acl_node_mutex); 554 555 core_tpg_wait_for_nacl_pr_ref(nacl); 556 core_free_device_list_for_node(nacl, se_tpg); 557 kfree(nacl); 558} 559 560void target_put_nacl(struct se_node_acl *nacl) 561{ 562 kref_put(&nacl->acl_kref, target_complete_nacl); 563} 564EXPORT_SYMBOL(target_put_nacl); 565 566void transport_deregister_session_configfs(struct se_session *se_sess) 567{ 568 struct se_node_acl *se_nacl; 569 unsigned long flags; 570 /* 571 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session 572 */ 573 se_nacl = se_sess->se_node_acl; 574 if (se_nacl) { 575 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); 576 if (!list_empty(&se_sess->sess_acl_list)) 577 list_del_init(&se_sess->sess_acl_list); 578 /* 579 * If the session list is empty, then clear the pointer. 580 * Otherwise, set the struct se_session pointer from the tail 581 * element of the per struct se_node_acl active session list. 582 */ 583 if (list_empty(&se_nacl->acl_sess_list)) 584 se_nacl->nacl_sess = NULL; 585 else { 586 se_nacl->nacl_sess = container_of( 587 se_nacl->acl_sess_list.prev, 588 struct se_session, sess_acl_list); 589 } 590 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); 591 } 592} 593EXPORT_SYMBOL(transport_deregister_session_configfs); 594 595void transport_free_session(struct se_session *se_sess) 596{ 597 struct se_node_acl *se_nacl = se_sess->se_node_acl; 598 599 /* 600 * Drop the se_node_acl->nacl_kref obtained from within 601 * core_tpg_get_initiator_node_acl(). 602 */ 603 if (se_nacl) { 604 struct se_portal_group *se_tpg = se_nacl->se_tpg; 605 const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo; 606 unsigned long flags; 607 608 se_sess->se_node_acl = NULL; 609 610 /* 611 * Also determine if we need to drop the extra ->cmd_kref if 612 * it had been previously dynamically generated, and 613 * the endpoint is not caching dynamic ACLs. 614 */ 615 mutex_lock(&se_tpg->acl_node_mutex); 616 if (se_nacl->dynamic_node_acl && 617 !se_tfo->tpg_check_demo_mode_cache(se_tpg)) { 618 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); 619 if (list_empty(&se_nacl->acl_sess_list)) 620 se_nacl->dynamic_stop = true; 621 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); 622 623 if (se_nacl->dynamic_stop) 624 list_del_init(&se_nacl->acl_list); 625 } 626 mutex_unlock(&se_tpg->acl_node_mutex); 627 628 if (se_nacl->dynamic_stop) 629 target_put_nacl(se_nacl); 630 631 target_put_nacl(se_nacl); 632 } 633 if (se_sess->sess_cmd_map) { 634 sbitmap_queue_free(&se_sess->sess_tag_pool); 635 kvfree(se_sess->sess_cmd_map); 636 } 637 if (se_sess->cmd_cnt) 638 target_free_cmd_counter(se_sess->cmd_cnt); 639 kmem_cache_free(se_sess_cache, se_sess); 640} 641EXPORT_SYMBOL(transport_free_session); 642 643static int target_release_res(struct se_device *dev, void *data) 644{ 645 struct se_session *sess = data; 646 647 if (dev->reservation_holder == sess) 648 target_release_reservation(dev); 649 return 0; 650} 651 652void transport_deregister_session(struct se_session *se_sess) 653{ 654 struct se_portal_group *se_tpg = se_sess->se_tpg; 655 unsigned long flags; 656 657 if (!se_tpg) { 658 transport_free_session(se_sess); 659 return; 660 } 661 662 spin_lock_irqsave(&se_tpg->session_lock, flags); 663 list_del(&se_sess->sess_list); 664 se_sess->se_tpg = NULL; 665 se_sess->fabric_sess_ptr = NULL; 666 spin_unlock_irqrestore(&se_tpg->session_lock, flags); 667 668 /* 669 * Since the session is being removed, release SPC-2 670 * reservations held by the session that is disappearing. 671 */ 672 target_for_each_device(target_release_res, se_sess); 673 674 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", 675 se_tpg->se_tpg_tfo->fabric_name); 676 /* 677 * If last kref is dropping now for an explicit NodeACL, awake sleeping 678 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group 679 * removal context from within transport_free_session() code. 680 * 681 * For dynamic ACL, target_put_nacl() uses target_complete_nacl() 682 * to release all remaining generate_node_acl=1 created ACL resources. 683 */ 684 685 transport_free_session(se_sess); 686} 687EXPORT_SYMBOL(transport_deregister_session); 688 689void target_remove_session(struct se_session *se_sess) 690{ 691 transport_deregister_session_configfs(se_sess); 692 transport_deregister_session(se_sess); 693} 694EXPORT_SYMBOL(target_remove_session); 695 696static void target_remove_from_state_list(struct se_cmd *cmd) 697{ 698 struct se_device *dev = cmd->se_dev; 699 unsigned long flags; 700 701 if (!dev) 702 return; 703 704 spin_lock_irqsave(&dev->queues[cmd->cpuid].lock, flags); 705 if (cmd->state_active) { 706 list_del(&cmd->state_list); 707 cmd->state_active = false; 708 } 709 spin_unlock_irqrestore(&dev->queues[cmd->cpuid].lock, flags); 710} 711 712static void target_remove_from_tmr_list(struct se_cmd *cmd) 713{ 714 struct se_device *dev = NULL; 715 unsigned long flags; 716 717 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 718 dev = cmd->se_tmr_req->tmr_dev; 719 720 if (dev) { 721 spin_lock_irqsave(&dev->se_tmr_lock, flags); 722 if (cmd->se_tmr_req->tmr_dev) 723 list_del_init(&cmd->se_tmr_req->tmr_list); 724 spin_unlock_irqrestore(&dev->se_tmr_lock, flags); 725 } 726} 727/* 728 * This function is called by the target core after the target core has 729 * finished processing a SCSI command or SCSI TMF. Both the regular command 730 * processing code and the code for aborting commands can call this 731 * function. CMD_T_STOP is set if and only if another thread is waiting 732 * inside transport_wait_for_tasks() for t_transport_stop_comp. 733 */ 734static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) 735{ 736 unsigned long flags; 737 738 spin_lock_irqsave(&cmd->t_state_lock, flags); 739 /* 740 * Determine if frontend context caller is requesting the stopping of 741 * this command for frontend exceptions. 742 */ 743 if (cmd->transport_state & CMD_T_STOP) { 744 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", 745 __func__, __LINE__, cmd->tag); 746 747 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 748 749 complete_all(&cmd->t_transport_stop_comp); 750 return 1; 751 } 752 cmd->transport_state &= ~CMD_T_ACTIVE; 753 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 754 755 /* 756 * Some fabric modules like tcm_loop can release their internally 757 * allocated I/O reference and struct se_cmd now. 758 * 759 * Fabric modules are expected to return '1' here if the se_cmd being 760 * passed is released at this point, or zero if not being released. 761 */ 762 return cmd->se_tfo->check_stop_free(cmd); 763} 764 765static void transport_lun_remove_cmd(struct se_cmd *cmd) 766{ 767 struct se_lun *lun = cmd->se_lun; 768 769 if (!lun) 770 return; 771 772 target_remove_from_state_list(cmd); 773 target_remove_from_tmr_list(cmd); 774 775 if (cmpxchg(&cmd->lun_ref_active, true, false)) 776 percpu_ref_put(&lun->lun_ref); 777 778 /* 779 * Clear struct se_cmd->se_lun before the handoff to FE. 780 */ 781 cmd->se_lun = NULL; 782} 783 784static void target_complete_failure_work(struct work_struct *work) 785{ 786 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 787 788 transport_generic_request_failure(cmd, cmd->sense_reason); 789} 790 791/* 792 * Used when asking transport to copy Sense Data from the underlying 793 * Linux/SCSI struct scsi_cmnd 794 */ 795static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) 796{ 797 struct se_device *dev = cmd->se_dev; 798 799 WARN_ON(!cmd->se_lun); 800 801 if (!dev) 802 return NULL; 803 804 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) 805 return NULL; 806 807 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; 808 809 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", 810 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); 811 return cmd->sense_buffer; 812} 813 814void transport_copy_sense_to_cmd(struct se_cmd *cmd, unsigned char *sense) 815{ 816 unsigned char *cmd_sense_buf; 817 unsigned long flags; 818 819 spin_lock_irqsave(&cmd->t_state_lock, flags); 820 cmd_sense_buf = transport_get_sense_buffer(cmd); 821 if (!cmd_sense_buf) { 822 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 823 return; 824 } 825 826 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; 827 memcpy(cmd_sense_buf, sense, cmd->scsi_sense_length); 828 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 829} 830EXPORT_SYMBOL(transport_copy_sense_to_cmd); 831 832static void target_handle_abort(struct se_cmd *cmd) 833{ 834 bool tas = cmd->transport_state & CMD_T_TAS; 835 bool ack_kref = cmd->se_cmd_flags & SCF_ACK_KREF; 836 int ret; 837 838 pr_debug("tag %#llx: send_abort_response = %d\n", cmd->tag, tas); 839 840 if (tas) { 841 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { 842 cmd->scsi_status = SAM_STAT_TASK_ABORTED; 843 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n", 844 cmd->t_task_cdb[0], cmd->tag); 845 trace_target_cmd_complete(cmd); 846 ret = cmd->se_tfo->queue_status(cmd); 847 if (ret) { 848 transport_handle_queue_full(cmd, cmd->se_dev, 849 ret, false); 850 return; 851 } 852 } else { 853 cmd->se_tmr_req->response = TMR_FUNCTION_REJECTED; 854 cmd->se_tfo->queue_tm_rsp(cmd); 855 } 856 } else { 857 /* 858 * Allow the fabric driver to unmap any resources before 859 * releasing the descriptor via TFO->release_cmd(). 860 */ 861 cmd->se_tfo->aborted_task(cmd); 862 if (ack_kref) 863 WARN_ON_ONCE(target_put_sess_cmd(cmd) != 0); 864 /* 865 * To do: establish a unit attention condition on the I_T 866 * nexus associated with cmd. See also the paragraph "Aborting 867 * commands" in SAM. 868 */ 869 } 870 871 WARN_ON_ONCE(kref_read(&cmd->cmd_kref) == 0); 872 873 transport_lun_remove_cmd(cmd); 874 875 transport_cmd_check_stop_to_fabric(cmd); 876} 877 878static void target_abort_work(struct work_struct *work) 879{ 880 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 881 882 target_handle_abort(cmd); 883} 884 885static bool target_cmd_interrupted(struct se_cmd *cmd) 886{ 887 int post_ret; 888 889 if (cmd->transport_state & CMD_T_ABORTED) { 890 if (cmd->transport_complete_callback) 891 cmd->transport_complete_callback(cmd, false, &post_ret); 892 INIT_WORK(&cmd->work, target_abort_work); 893 queue_work(target_completion_wq, &cmd->work); 894 return true; 895 } else if (cmd->transport_state & CMD_T_STOP) { 896 if (cmd->transport_complete_callback) 897 cmd->transport_complete_callback(cmd, false, &post_ret); 898 complete_all(&cmd->t_transport_stop_comp); 899 return true; 900 } 901 902 return false; 903} 904 905/* May be called from interrupt context so must not sleep. */ 906void target_complete_cmd_with_sense(struct se_cmd *cmd, u8 scsi_status, 907 sense_reason_t sense_reason) 908{ 909 struct se_wwn *wwn = cmd->se_sess->se_tpg->se_tpg_wwn; 910 int success, cpu; 911 unsigned long flags; 912 913 if (target_cmd_interrupted(cmd)) 914 return; 915 916 cmd->scsi_status = scsi_status; 917 cmd->sense_reason = sense_reason; 918 919 spin_lock_irqsave(&cmd->t_state_lock, flags); 920 switch (cmd->scsi_status) { 921 case SAM_STAT_CHECK_CONDITION: 922 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) 923 success = 1; 924 else 925 success = 0; 926 break; 927 default: 928 success = 1; 929 break; 930 } 931 932 cmd->t_state = TRANSPORT_COMPLETE; 933 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); 934 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 935 936 INIT_WORK(&cmd->work, success ? target_complete_ok_work : 937 target_complete_failure_work); 938 939 if (!wwn || wwn->cmd_compl_affinity == SE_COMPL_AFFINITY_CPUID) 940 cpu = cmd->cpuid; 941 else 942 cpu = wwn->cmd_compl_affinity; 943 944 queue_work_on(cpu, target_completion_wq, &cmd->work); 945} 946EXPORT_SYMBOL(target_complete_cmd_with_sense); 947 948void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) 949{ 950 target_complete_cmd_with_sense(cmd, scsi_status, scsi_status ? 951 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE : 952 TCM_NO_SENSE); 953} 954EXPORT_SYMBOL(target_complete_cmd); 955 956void target_set_cmd_data_length(struct se_cmd *cmd, int length) 957{ 958 if (length < cmd->data_length) { 959 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { 960 cmd->residual_count += cmd->data_length - length; 961 } else { 962 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; 963 cmd->residual_count = cmd->data_length - length; 964 } 965 966 cmd->data_length = length; 967 } 968} 969EXPORT_SYMBOL(target_set_cmd_data_length); 970 971void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) 972{ 973 if (scsi_status == SAM_STAT_GOOD || 974 cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) { 975 target_set_cmd_data_length(cmd, length); 976 } 977 978 target_complete_cmd(cmd, scsi_status); 979} 980EXPORT_SYMBOL(target_complete_cmd_with_length); 981 982static void target_add_to_state_list(struct se_cmd *cmd) 983{ 984 struct se_device *dev = cmd->se_dev; 985 unsigned long flags; 986 987 spin_lock_irqsave(&dev->queues[cmd->cpuid].lock, flags); 988 if (!cmd->state_active) { 989 list_add_tail(&cmd->state_list, 990 &dev->queues[cmd->cpuid].state_list); 991 cmd->state_active = true; 992 } 993 spin_unlock_irqrestore(&dev->queues[cmd->cpuid].lock, flags); 994} 995 996/* 997 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status 998 */ 999static void transport_write_pending_qf(struct se_cmd *cmd); 1000static void transport_complete_qf(struct se_cmd *cmd); 1001 1002void target_qf_do_work(struct work_struct *work) 1003{ 1004 struct se_device *dev = container_of(work, struct se_device, 1005 qf_work_queue); 1006 LIST_HEAD(qf_cmd_list); 1007 struct se_cmd *cmd, *cmd_tmp; 1008 1009 spin_lock_irq(&dev->qf_cmd_lock); 1010 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); 1011 spin_unlock_irq(&dev->qf_cmd_lock); 1012 1013 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { 1014 list_del(&cmd->se_qf_node); 1015 atomic_dec_mb(&dev->dev_qf_count); 1016 1017 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" 1018 " context: %s\n", cmd->se_tfo->fabric_name, cmd, 1019 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : 1020 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" 1021 : "UNKNOWN"); 1022 1023 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) 1024 transport_write_pending_qf(cmd); 1025 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK || 1026 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) 1027 transport_complete_qf(cmd); 1028 } 1029} 1030 1031unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) 1032{ 1033 switch (cmd->data_direction) { 1034 case DMA_NONE: 1035 return "NONE"; 1036 case DMA_FROM_DEVICE: 1037 return "READ"; 1038 case DMA_TO_DEVICE: 1039 return "WRITE"; 1040 case DMA_BIDIRECTIONAL: 1041 return "BIDI"; 1042 default: 1043 break; 1044 } 1045 1046 return "UNKNOWN"; 1047} 1048 1049void transport_dump_dev_state( 1050 struct se_device *dev, 1051 char *b, 1052 int *bl) 1053{ 1054 *bl += sprintf(b + *bl, "Status: "); 1055 if (dev->export_count) 1056 *bl += sprintf(b + *bl, "ACTIVATED"); 1057 else 1058 *bl += sprintf(b + *bl, "DEACTIVATED"); 1059 1060 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); 1061 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", 1062 dev->dev_attrib.block_size, 1063 dev->dev_attrib.hw_max_sectors); 1064 *bl += sprintf(b + *bl, " "); 1065} 1066 1067void transport_dump_vpd_proto_id( 1068 struct t10_vpd *vpd, 1069 unsigned char *p_buf, 1070 int p_buf_len) 1071{ 1072 unsigned char buf[VPD_TMP_BUF_SIZE]; 1073 int len; 1074 1075 memset(buf, 0, VPD_TMP_BUF_SIZE); 1076 len = sprintf(buf, "T10 VPD Protocol Identifier: "); 1077 1078 switch (vpd->protocol_identifier) { 1079 case 0x00: 1080 sprintf(buf+len, "Fibre Channel\n"); 1081 break; 1082 case 0x10: 1083 sprintf(buf+len, "Parallel SCSI\n"); 1084 break; 1085 case 0x20: 1086 sprintf(buf+len, "SSA\n"); 1087 break; 1088 case 0x30: 1089 sprintf(buf+len, "IEEE 1394\n"); 1090 break; 1091 case 0x40: 1092 sprintf(buf+len, "SCSI Remote Direct Memory Access" 1093 " Protocol\n"); 1094 break; 1095 case 0x50: 1096 sprintf(buf+len, "Internet SCSI (iSCSI)\n"); 1097 break; 1098 case 0x60: 1099 sprintf(buf+len, "SAS Serial SCSI Protocol\n"); 1100 break; 1101 case 0x70: 1102 sprintf(buf+len, "Automation/Drive Interface Transport" 1103 " Protocol\n"); 1104 break; 1105 case 0x80: 1106 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); 1107 break; 1108 default: 1109 sprintf(buf+len, "Unknown 0x%02x\n", 1110 vpd->protocol_identifier); 1111 break; 1112 } 1113 1114 if (p_buf) 1115 strncpy(p_buf, buf, p_buf_len); 1116 else 1117 pr_debug("%s", buf); 1118} 1119 1120void 1121transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) 1122{ 1123 /* 1124 * Check if the Protocol Identifier Valid (PIV) bit is set.. 1125 * 1126 * from spc3r23.pdf section 7.5.1 1127 */ 1128 if (page_83[1] & 0x80) { 1129 vpd->protocol_identifier = (page_83[0] & 0xf0); 1130 vpd->protocol_identifier_set = 1; 1131 transport_dump_vpd_proto_id(vpd, NULL, 0); 1132 } 1133} 1134EXPORT_SYMBOL(transport_set_vpd_proto_id); 1135 1136int transport_dump_vpd_assoc( 1137 struct t10_vpd *vpd, 1138 unsigned char *p_buf, 1139 int p_buf_len) 1140{ 1141 unsigned char buf[VPD_TMP_BUF_SIZE]; 1142 int ret = 0; 1143 int len; 1144 1145 memset(buf, 0, VPD_TMP_BUF_SIZE); 1146 len = sprintf(buf, "T10 VPD Identifier Association: "); 1147 1148 switch (vpd->association) { 1149 case 0x00: 1150 sprintf(buf+len, "addressed logical unit\n"); 1151 break; 1152 case 0x10: 1153 sprintf(buf+len, "target port\n"); 1154 break; 1155 case 0x20: 1156 sprintf(buf+len, "SCSI target device\n"); 1157 break; 1158 default: 1159 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); 1160 ret = -EINVAL; 1161 break; 1162 } 1163 1164 if (p_buf) 1165 strncpy(p_buf, buf, p_buf_len); 1166 else 1167 pr_debug("%s", buf); 1168 1169 return ret; 1170} 1171 1172int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) 1173{ 1174 /* 1175 * The VPD identification association.. 1176 * 1177 * from spc3r23.pdf Section 7.6.3.1 Table 297 1178 */ 1179 vpd->association = (page_83[1] & 0x30); 1180 return transport_dump_vpd_assoc(vpd, NULL, 0); 1181} 1182EXPORT_SYMBOL(transport_set_vpd_assoc); 1183 1184int transport_dump_vpd_ident_type( 1185 struct t10_vpd *vpd, 1186 unsigned char *p_buf, 1187 int p_buf_len) 1188{ 1189 unsigned char buf[VPD_TMP_BUF_SIZE]; 1190 int ret = 0; 1191 int len; 1192 1193 memset(buf, 0, VPD_TMP_BUF_SIZE); 1194 len = sprintf(buf, "T10 VPD Identifier Type: "); 1195 1196 switch (vpd->device_identifier_type) { 1197 case 0x00: 1198 sprintf(buf+len, "Vendor specific\n"); 1199 break; 1200 case 0x01: 1201 sprintf(buf+len, "T10 Vendor ID based\n"); 1202 break; 1203 case 0x02: 1204 sprintf(buf+len, "EUI-64 based\n"); 1205 break; 1206 case 0x03: 1207 sprintf(buf+len, "NAA\n"); 1208 break; 1209 case 0x04: 1210 sprintf(buf+len, "Relative target port identifier\n"); 1211 break; 1212 case 0x08: 1213 sprintf(buf+len, "SCSI name string\n"); 1214 break; 1215 default: 1216 sprintf(buf+len, "Unsupported: 0x%02x\n", 1217 vpd->device_identifier_type); 1218 ret = -EINVAL; 1219 break; 1220 } 1221 1222 if (p_buf) { 1223 if (p_buf_len < strlen(buf)+1) 1224 return -EINVAL; 1225 strncpy(p_buf, buf, p_buf_len); 1226 } else { 1227 pr_debug("%s", buf); 1228 } 1229 1230 return ret; 1231} 1232 1233int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) 1234{ 1235 /* 1236 * The VPD identifier type.. 1237 * 1238 * from spc3r23.pdf Section 7.6.3.1 Table 298 1239 */ 1240 vpd->device_identifier_type = (page_83[1] & 0x0f); 1241 return transport_dump_vpd_ident_type(vpd, NULL, 0); 1242} 1243EXPORT_SYMBOL(transport_set_vpd_ident_type); 1244 1245int transport_dump_vpd_ident( 1246 struct t10_vpd *vpd, 1247 unsigned char *p_buf, 1248 int p_buf_len) 1249{ 1250 unsigned char buf[VPD_TMP_BUF_SIZE]; 1251 int ret = 0; 1252 1253 memset(buf, 0, VPD_TMP_BUF_SIZE); 1254 1255 switch (vpd->device_identifier_code_set) { 1256 case 0x01: /* Binary */ 1257 snprintf(buf, sizeof(buf), 1258 "T10 VPD Binary Device Identifier: %s\n", 1259 &vpd->device_identifier[0]); 1260 break; 1261 case 0x02: /* ASCII */ 1262 snprintf(buf, sizeof(buf), 1263 "T10 VPD ASCII Device Identifier: %s\n", 1264 &vpd->device_identifier[0]); 1265 break; 1266 case 0x03: /* UTF-8 */ 1267 snprintf(buf, sizeof(buf), 1268 "T10 VPD UTF-8 Device Identifier: %s\n", 1269 &vpd->device_identifier[0]); 1270 break; 1271 default: 1272 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" 1273 " 0x%02x", vpd->device_identifier_code_set); 1274 ret = -EINVAL; 1275 break; 1276 } 1277 1278 if (p_buf) 1279 strncpy(p_buf, buf, p_buf_len); 1280 else 1281 pr_debug("%s", buf); 1282 1283 return ret; 1284} 1285 1286int 1287transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) 1288{ 1289 static const char hex_str[] = "0123456789abcdef"; 1290 int j = 0, i = 4; /* offset to start of the identifier */ 1291 1292 /* 1293 * The VPD Code Set (encoding) 1294 * 1295 * from spc3r23.pdf Section 7.6.3.1 Table 296 1296 */ 1297 vpd->device_identifier_code_set = (page_83[0] & 0x0f); 1298 switch (vpd->device_identifier_code_set) { 1299 case 0x01: /* Binary */ 1300 vpd->device_identifier[j++] = 1301 hex_str[vpd->device_identifier_type]; 1302 while (i < (4 + page_83[3])) { 1303 vpd->device_identifier[j++] = 1304 hex_str[(page_83[i] & 0xf0) >> 4]; 1305 vpd->device_identifier[j++] = 1306 hex_str[page_83[i] & 0x0f]; 1307 i++; 1308 } 1309 break; 1310 case 0x02: /* ASCII */ 1311 case 0x03: /* UTF-8 */ 1312 while (i < (4 + page_83[3])) 1313 vpd->device_identifier[j++] = page_83[i++]; 1314 break; 1315 default: 1316 break; 1317 } 1318 1319 return transport_dump_vpd_ident(vpd, NULL, 0); 1320} 1321EXPORT_SYMBOL(transport_set_vpd_ident); 1322 1323static sense_reason_t 1324target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev, 1325 unsigned int size) 1326{ 1327 u32 mtl; 1328 1329 if (!cmd->se_tfo->max_data_sg_nents) 1330 return TCM_NO_SENSE; 1331 /* 1332 * Check if fabric enforced maximum SGL entries per I/O descriptor 1333 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT + 1334 * residual_count and reduce original cmd->data_length to maximum 1335 * length based on single PAGE_SIZE entry scatter-lists. 1336 */ 1337 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE); 1338 if (cmd->data_length > mtl) { 1339 /* 1340 * If an existing CDB overflow is present, calculate new residual 1341 * based on CDB size minus fabric maximum transfer length. 1342 * 1343 * If an existing CDB underflow is present, calculate new residual 1344 * based on original cmd->data_length minus fabric maximum transfer 1345 * length. 1346 * 1347 * Otherwise, set the underflow residual based on cmd->data_length 1348 * minus fabric maximum transfer length. 1349 */ 1350 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { 1351 cmd->residual_count = (size - mtl); 1352 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { 1353 u32 orig_dl = size + cmd->residual_count; 1354 cmd->residual_count = (orig_dl - mtl); 1355 } else { 1356 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; 1357 cmd->residual_count = (cmd->data_length - mtl); 1358 } 1359 cmd->data_length = mtl; 1360 /* 1361 * Reset sbc_check_prot() calculated protection payload 1362 * length based upon the new smaller MTL. 1363 */ 1364 if (cmd->prot_length) { 1365 u32 sectors = (mtl / dev->dev_attrib.block_size); 1366 cmd->prot_length = dev->prot_length * sectors; 1367 } 1368 } 1369 return TCM_NO_SENSE; 1370} 1371 1372/** 1373 * target_cmd_size_check - Check whether there will be a residual. 1374 * @cmd: SCSI command. 1375 * @size: Data buffer size derived from CDB. The data buffer size provided by 1376 * the SCSI transport driver is available in @cmd->data_length. 1377 * 1378 * Compare the data buffer size from the CDB with the data buffer limit from the transport 1379 * header. Set @cmd->residual_count and SCF_OVERFLOW_BIT or SCF_UNDERFLOW_BIT if necessary. 1380 * 1381 * Note: target drivers set @cmd->data_length by calling __target_init_cmd(). 1382 * 1383 * Return: TCM_NO_SENSE 1384 */ 1385sense_reason_t 1386target_cmd_size_check(struct se_cmd *cmd, unsigned int size) 1387{ 1388 struct se_device *dev = cmd->se_dev; 1389 1390 if (cmd->unknown_data_length) { 1391 cmd->data_length = size; 1392 } else if (size != cmd->data_length) { 1393 pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:" 1394 " %u does not match SCSI CDB Length: %u for SAM Opcode:" 1395 " 0x%02x\n", cmd->se_tfo->fabric_name, 1396 cmd->data_length, size, cmd->t_task_cdb[0]); 1397 /* 1398 * For READ command for the overflow case keep the existing 1399 * fabric provided ->data_length. Otherwise for the underflow 1400 * case, reset ->data_length to the smaller SCSI expected data 1401 * transfer length. 1402 */ 1403 if (size > cmd->data_length) { 1404 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; 1405 cmd->residual_count = (size - cmd->data_length); 1406 } else { 1407 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; 1408 cmd->residual_count = (cmd->data_length - size); 1409 /* 1410 * Do not truncate ->data_length for WRITE command to 1411 * dump all payload 1412 */ 1413 if (cmd->data_direction == DMA_FROM_DEVICE) { 1414 cmd->data_length = size; 1415 } 1416 } 1417 1418 if (cmd->data_direction == DMA_TO_DEVICE) { 1419 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 1420 pr_err_ratelimited("Rejecting underflow/overflow" 1421 " for WRITE data CDB\n"); 1422 return TCM_INVALID_FIELD_IN_COMMAND_IU; 1423 } 1424 /* 1425 * Some fabric drivers like iscsi-target still expect to 1426 * always reject overflow writes. Reject this case until 1427 * full fabric driver level support for overflow writes 1428 * is introduced tree-wide. 1429 */ 1430 if (size > cmd->data_length) { 1431 pr_err_ratelimited("Rejecting overflow for" 1432 " WRITE control CDB\n"); 1433 return TCM_INVALID_CDB_FIELD; 1434 } 1435 } 1436 } 1437 1438 return target_check_max_data_sg_nents(cmd, dev, size); 1439 1440} 1441 1442/* 1443 * Used by fabric modules containing a local struct se_cmd within their 1444 * fabric dependent per I/O descriptor. 1445 * 1446 * Preserves the value of @cmd->tag. 1447 */ 1448void __target_init_cmd(struct se_cmd *cmd, 1449 const struct target_core_fabric_ops *tfo, 1450 struct se_session *se_sess, u32 data_length, 1451 int data_direction, int task_attr, 1452 unsigned char *sense_buffer, u64 unpacked_lun, 1453 struct target_cmd_counter *cmd_cnt) 1454{ 1455 INIT_LIST_HEAD(&cmd->se_delayed_node); 1456 INIT_LIST_HEAD(&cmd->se_qf_node); 1457 INIT_LIST_HEAD(&cmd->state_list); 1458 init_completion(&cmd->t_transport_stop_comp); 1459 cmd->free_compl = NULL; 1460 cmd->abrt_compl = NULL; 1461 spin_lock_init(&cmd->t_state_lock); 1462 INIT_WORK(&cmd->work, NULL); 1463 kref_init(&cmd->cmd_kref); 1464 1465 cmd->t_task_cdb = &cmd->__t_task_cdb[0]; 1466 cmd->se_tfo = tfo; 1467 cmd->se_sess = se_sess; 1468 cmd->data_length = data_length; 1469 cmd->data_direction = data_direction; 1470 cmd->sam_task_attr = task_attr; 1471 cmd->sense_buffer = sense_buffer; 1472 cmd->orig_fe_lun = unpacked_lun; 1473 cmd->cmd_cnt = cmd_cnt; 1474 1475 if (!(cmd->se_cmd_flags & SCF_USE_CPUID)) 1476 cmd->cpuid = raw_smp_processor_id(); 1477 1478 cmd->state_active = false; 1479} 1480EXPORT_SYMBOL(__target_init_cmd); 1481 1482static sense_reason_t 1483transport_check_alloc_task_attr(struct se_cmd *cmd) 1484{ 1485 struct se_device *dev = cmd->se_dev; 1486 1487 /* 1488 * Check if SAM Task Attribute emulation is enabled for this 1489 * struct se_device storage object 1490 */ 1491 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 1492 return 0; 1493 1494 if (cmd->sam_task_attr == TCM_ACA_TAG) { 1495 pr_debug("SAM Task Attribute ACA" 1496 " emulation is not supported\n"); 1497 return TCM_INVALID_CDB_FIELD; 1498 } 1499 1500 return 0; 1501} 1502 1503sense_reason_t 1504target_cmd_init_cdb(struct se_cmd *cmd, unsigned char *cdb, gfp_t gfp) 1505{ 1506 sense_reason_t ret; 1507 1508 /* 1509 * Ensure that the received CDB is less than the max (252 + 8) bytes 1510 * for VARIABLE_LENGTH_CMD 1511 */ 1512 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { 1513 pr_err("Received SCSI CDB with command_size: %d that" 1514 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", 1515 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); 1516 ret = TCM_INVALID_CDB_FIELD; 1517 goto err; 1518 } 1519 /* 1520 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, 1521 * allocate the additional extended CDB buffer now.. Otherwise 1522 * setup the pointer from __t_task_cdb to t_task_cdb. 1523 */ 1524 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { 1525 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), gfp); 1526 if (!cmd->t_task_cdb) { 1527 pr_err("Unable to allocate cmd->t_task_cdb" 1528 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", 1529 scsi_command_size(cdb), 1530 (unsigned long)sizeof(cmd->__t_task_cdb)); 1531 ret = TCM_OUT_OF_RESOURCES; 1532 goto err; 1533 } 1534 } 1535 /* 1536 * Copy the original CDB into cmd-> 1537 */ 1538 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); 1539 1540 trace_target_sequencer_start(cmd); 1541 return 0; 1542 1543err: 1544 /* 1545 * Copy the CDB here to allow trace_target_cmd_complete() to 1546 * print the cdb to the trace buffers. 1547 */ 1548 memcpy(cmd->t_task_cdb, cdb, min(scsi_command_size(cdb), 1549 (unsigned int)TCM_MAX_COMMAND_SIZE)); 1550 return ret; 1551} 1552EXPORT_SYMBOL(target_cmd_init_cdb); 1553 1554sense_reason_t 1555target_cmd_parse_cdb(struct se_cmd *cmd) 1556{ 1557 struct se_device *dev = cmd->se_dev; 1558 sense_reason_t ret; 1559 1560 ret = dev->transport->parse_cdb(cmd); 1561 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE) 1562 pr_debug_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n", 1563 cmd->se_tfo->fabric_name, 1564 cmd->se_sess->se_node_acl->initiatorname, 1565 cmd->t_task_cdb[0]); 1566 if (ret) 1567 return ret; 1568 1569 ret = transport_check_alloc_task_attr(cmd); 1570 if (ret) 1571 return ret; 1572 1573 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; 1574 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus); 1575 return 0; 1576} 1577EXPORT_SYMBOL(target_cmd_parse_cdb); 1578 1579static int __target_submit(struct se_cmd *cmd) 1580{ 1581 sense_reason_t ret; 1582 1583 might_sleep(); 1584 1585 /* 1586 * Check if we need to delay processing because of ALUA 1587 * Active/NonOptimized primary access state.. 1588 */ 1589 core_alua_check_nonop_delay(cmd); 1590 1591 if (cmd->t_data_nents != 0) { 1592 /* 1593 * This is primarily a hack for udev and tcm loop which sends 1594 * INQUIRYs with a single page and expects the data to be 1595 * cleared. 1596 */ 1597 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && 1598 cmd->data_direction == DMA_FROM_DEVICE) { 1599 struct scatterlist *sgl = cmd->t_data_sg; 1600 unsigned char *buf = NULL; 1601 1602 BUG_ON(!sgl); 1603 1604 buf = kmap_local_page(sg_page(sgl)); 1605 if (buf) { 1606 memset(buf + sgl->offset, 0, sgl->length); 1607 kunmap_local(buf); 1608 } 1609 } 1610 } 1611 1612 if (!cmd->se_lun) { 1613 dump_stack(); 1614 pr_err("cmd->se_lun is NULL\n"); 1615 return -EINVAL; 1616 } 1617 1618 /* 1619 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that 1620 * outstanding descriptors are handled correctly during shutdown via 1621 * transport_wait_for_tasks() 1622 * 1623 * Also, we don't take cmd->t_state_lock here as we only expect 1624 * this to be called for initial descriptor submission. 1625 */ 1626 cmd->t_state = TRANSPORT_NEW_CMD; 1627 cmd->transport_state |= CMD_T_ACTIVE; 1628 1629 /* 1630 * transport_generic_new_cmd() is already handling QUEUE_FULL, 1631 * so follow TRANSPORT_NEW_CMD processing thread context usage 1632 * and call transport_generic_request_failure() if necessary.. 1633 */ 1634 ret = transport_generic_new_cmd(cmd); 1635 if (ret) 1636 transport_generic_request_failure(cmd, ret); 1637 return 0; 1638} 1639 1640sense_reason_t 1641transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, 1642 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) 1643{ 1644 if (!sgl || !sgl_count) 1645 return 0; 1646 1647 /* 1648 * Reject SCSI data overflow with map_mem_to_cmd() as incoming 1649 * scatterlists already have been set to follow what the fabric 1650 * passes for the original expected data transfer length. 1651 */ 1652 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { 1653 pr_warn("Rejecting SCSI DATA overflow for fabric using" 1654 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); 1655 return TCM_INVALID_CDB_FIELD; 1656 } 1657 1658 cmd->t_data_sg = sgl; 1659 cmd->t_data_nents = sgl_count; 1660 cmd->t_bidi_data_sg = sgl_bidi; 1661 cmd->t_bidi_data_nents = sgl_bidi_count; 1662 1663 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 1664 return 0; 1665} 1666 1667/** 1668 * target_init_cmd - initialize se_cmd 1669 * @se_cmd: command descriptor to init 1670 * @se_sess: associated se_sess for endpoint 1671 * @sense: pointer to SCSI sense buffer 1672 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1673 * @data_length: fabric expected data transfer length 1674 * @task_attr: SAM task attribute 1675 * @data_dir: DMA data direction 1676 * @flags: flags for command submission from target_sc_flags_tables 1677 * 1678 * Task tags are supported if the caller has set @se_cmd->tag. 1679 * 1680 * Returns: 1681 * - less than zero to signal active I/O shutdown failure. 1682 * - zero on success. 1683 * 1684 * If the fabric driver calls target_stop_session, then it must check the 1685 * return code and handle failures. This will never fail for other drivers, 1686 * and the return code can be ignored. 1687 */ 1688int target_init_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, 1689 unsigned char *sense, u64 unpacked_lun, 1690 u32 data_length, int task_attr, int data_dir, int flags) 1691{ 1692 struct se_portal_group *se_tpg; 1693 1694 se_tpg = se_sess->se_tpg; 1695 BUG_ON(!se_tpg); 1696 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); 1697 1698 if (flags & TARGET_SCF_USE_CPUID) 1699 se_cmd->se_cmd_flags |= SCF_USE_CPUID; 1700 /* 1701 * Signal bidirectional data payloads to target-core 1702 */ 1703 if (flags & TARGET_SCF_BIDI_OP) 1704 se_cmd->se_cmd_flags |= SCF_BIDI; 1705 1706 if (flags & TARGET_SCF_UNKNOWN_SIZE) 1707 se_cmd->unknown_data_length = 1; 1708 /* 1709 * Initialize se_cmd for target operation. From this point 1710 * exceptions are handled by sending exception status via 1711 * target_core_fabric_ops->queue_status() callback 1712 */ 1713 __target_init_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, data_length, 1714 data_dir, task_attr, sense, unpacked_lun, 1715 se_sess->cmd_cnt); 1716 1717 /* 1718 * Obtain struct se_cmd->cmd_kref reference. A second kref_get here is 1719 * necessary for fabrics using TARGET_SCF_ACK_KREF that expect a second 1720 * kref_put() to happen during fabric packet acknowledgement. 1721 */ 1722 return target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); 1723} 1724EXPORT_SYMBOL_GPL(target_init_cmd); 1725 1726/** 1727 * target_submit_prep - prepare cmd for submission 1728 * @se_cmd: command descriptor to prep 1729 * @cdb: pointer to SCSI CDB 1730 * @sgl: struct scatterlist memory for unidirectional mapping 1731 * @sgl_count: scatterlist count for unidirectional mapping 1732 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping 1733 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping 1734 * @sgl_prot: struct scatterlist memory protection information 1735 * @sgl_prot_count: scatterlist count for protection information 1736 * @gfp: gfp allocation type 1737 * 1738 * Returns: 1739 * - less than zero to signal failure. 1740 * - zero on success. 1741 * 1742 * If failure is returned, lio will the callers queue_status to complete 1743 * the cmd. 1744 */ 1745int target_submit_prep(struct se_cmd *se_cmd, unsigned char *cdb, 1746 struct scatterlist *sgl, u32 sgl_count, 1747 struct scatterlist *sgl_bidi, u32 sgl_bidi_count, 1748 struct scatterlist *sgl_prot, u32 sgl_prot_count, 1749 gfp_t gfp) 1750{ 1751 sense_reason_t rc; 1752 1753 rc = target_cmd_init_cdb(se_cmd, cdb, gfp); 1754 if (rc) 1755 goto send_cc_direct; 1756 1757 /* 1758 * Locate se_lun pointer and attach it to struct se_cmd 1759 */ 1760 rc = transport_lookup_cmd_lun(se_cmd); 1761 if (rc) 1762 goto send_cc_direct; 1763 1764 rc = target_cmd_parse_cdb(se_cmd); 1765 if (rc != 0) 1766 goto generic_fail; 1767 1768 /* 1769 * Save pointers for SGLs containing protection information, 1770 * if present. 1771 */ 1772 if (sgl_prot_count) { 1773 se_cmd->t_prot_sg = sgl_prot; 1774 se_cmd->t_prot_nents = sgl_prot_count; 1775 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC; 1776 } 1777 1778 /* 1779 * When a non zero sgl_count has been passed perform SGL passthrough 1780 * mapping for pre-allocated fabric memory instead of having target 1781 * core perform an internal SGL allocation.. 1782 */ 1783 if (sgl_count != 0) { 1784 BUG_ON(!sgl); 1785 1786 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, 1787 sgl_bidi, sgl_bidi_count); 1788 if (rc != 0) 1789 goto generic_fail; 1790 } 1791 1792 return 0; 1793 1794send_cc_direct: 1795 transport_send_check_condition_and_sense(se_cmd, rc, 0); 1796 target_put_sess_cmd(se_cmd); 1797 return -EIO; 1798 1799generic_fail: 1800 transport_generic_request_failure(se_cmd, rc); 1801 return -EIO; 1802} 1803EXPORT_SYMBOL_GPL(target_submit_prep); 1804 1805/** 1806 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd 1807 * 1808 * @se_cmd: command descriptor to submit 1809 * @se_sess: associated se_sess for endpoint 1810 * @cdb: pointer to SCSI CDB 1811 * @sense: pointer to SCSI sense buffer 1812 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1813 * @data_length: fabric expected data transfer length 1814 * @task_attr: SAM task attribute 1815 * @data_dir: DMA data direction 1816 * @flags: flags for command submission from target_sc_flags_tables 1817 * 1818 * Task tags are supported if the caller has set @se_cmd->tag. 1819 * 1820 * This may only be called from process context, and also currently 1821 * assumes internal allocation of fabric payload buffer by target-core. 1822 * 1823 * It also assumes interal target core SGL memory allocation. 1824 * 1825 * This function must only be used by drivers that do their own 1826 * sync during shutdown and does not use target_stop_session. If there 1827 * is a failure this function will call into the fabric driver's 1828 * queue_status with a CHECK_CONDITION. 1829 */ 1830void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, 1831 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, 1832 u32 data_length, int task_attr, int data_dir, int flags) 1833{ 1834 int rc; 1835 1836 rc = target_init_cmd(se_cmd, se_sess, sense, unpacked_lun, data_length, 1837 task_attr, data_dir, flags); 1838 WARN(rc, "Invalid target_submit_cmd use. Driver must not use target_stop_session or call target_init_cmd directly.\n"); 1839 if (rc) 1840 return; 1841 1842 if (target_submit_prep(se_cmd, cdb, NULL, 0, NULL, 0, NULL, 0, 1843 GFP_KERNEL)) 1844 return; 1845 1846 target_submit(se_cmd); 1847} 1848EXPORT_SYMBOL(target_submit_cmd); 1849 1850 1851static struct se_dev_plug *target_plug_device(struct se_device *se_dev) 1852{ 1853 struct se_dev_plug *se_plug; 1854 1855 if (!se_dev->transport->plug_device) 1856 return NULL; 1857 1858 se_plug = se_dev->transport->plug_device(se_dev); 1859 if (!se_plug) 1860 return NULL; 1861 1862 se_plug->se_dev = se_dev; 1863 /* 1864 * We have a ref to the lun at this point, but the cmds could 1865 * complete before we unplug, so grab a ref to the se_device so we 1866 * can call back into the backend. 1867 */ 1868 config_group_get(&se_dev->dev_group); 1869 return se_plug; 1870} 1871 1872static void target_unplug_device(struct se_dev_plug *se_plug) 1873{ 1874 struct se_device *se_dev = se_plug->se_dev; 1875 1876 se_dev->transport->unplug_device(se_plug); 1877 config_group_put(&se_dev->dev_group); 1878} 1879 1880void target_queued_submit_work(struct work_struct *work) 1881{ 1882 struct se_cmd_queue *sq = container_of(work, struct se_cmd_queue, work); 1883 struct se_cmd *se_cmd, *next_cmd; 1884 struct se_dev_plug *se_plug = NULL; 1885 struct se_device *se_dev = NULL; 1886 struct llist_node *cmd_list; 1887 1888 cmd_list = llist_del_all(&sq->cmd_list); 1889 if (!cmd_list) 1890 /* Previous call took what we were queued to submit */ 1891 return; 1892 1893 cmd_list = llist_reverse_order(cmd_list); 1894 llist_for_each_entry_safe(se_cmd, next_cmd, cmd_list, se_cmd_list) { 1895 if (!se_dev) { 1896 se_dev = se_cmd->se_dev; 1897 se_plug = target_plug_device(se_dev); 1898 } 1899 1900 __target_submit(se_cmd); 1901 } 1902 1903 if (se_plug) 1904 target_unplug_device(se_plug); 1905} 1906 1907/** 1908 * target_queue_submission - queue the cmd to run on the LIO workqueue 1909 * @se_cmd: command descriptor to submit 1910 */ 1911static void target_queue_submission(struct se_cmd *se_cmd) 1912{ 1913 struct se_device *se_dev = se_cmd->se_dev; 1914 int cpu = se_cmd->cpuid; 1915 struct se_cmd_queue *sq; 1916 1917 sq = &se_dev->queues[cpu].sq; 1918 llist_add(&se_cmd->se_cmd_list, &sq->cmd_list); 1919 queue_work_on(cpu, target_submission_wq, &sq->work); 1920} 1921 1922/** 1923 * target_submit - perform final initialization and submit cmd to LIO core 1924 * @se_cmd: command descriptor to submit 1925 * 1926 * target_submit_prep or something similar must have been called on the cmd, 1927 * and this must be called from process context. 1928 */ 1929int target_submit(struct se_cmd *se_cmd) 1930{ 1931 const struct target_core_fabric_ops *tfo = se_cmd->se_sess->se_tpg->se_tpg_tfo; 1932 struct se_dev_attrib *da = &se_cmd->se_dev->dev_attrib; 1933 u8 submit_type; 1934 1935 if (da->submit_type == TARGET_FABRIC_DEFAULT_SUBMIT) 1936 submit_type = tfo->default_submit_type; 1937 else if (da->submit_type == TARGET_DIRECT_SUBMIT && 1938 tfo->direct_submit_supp) 1939 submit_type = TARGET_DIRECT_SUBMIT; 1940 else 1941 submit_type = TARGET_QUEUE_SUBMIT; 1942 1943 if (submit_type == TARGET_DIRECT_SUBMIT) 1944 return __target_submit(se_cmd); 1945 1946 target_queue_submission(se_cmd); 1947 return 0; 1948} 1949EXPORT_SYMBOL_GPL(target_submit); 1950 1951static void target_complete_tmr_failure(struct work_struct *work) 1952{ 1953 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); 1954 1955 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; 1956 se_cmd->se_tfo->queue_tm_rsp(se_cmd); 1957 1958 transport_lun_remove_cmd(se_cmd); 1959 transport_cmd_check_stop_to_fabric(se_cmd); 1960} 1961 1962/** 1963 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd 1964 * for TMR CDBs 1965 * 1966 * @se_cmd: command descriptor to submit 1967 * @se_sess: associated se_sess for endpoint 1968 * @sense: pointer to SCSI sense buffer 1969 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1970 * @fabric_tmr_ptr: fabric context for TMR req 1971 * @tm_type: Type of TM request 1972 * @gfp: gfp type for caller 1973 * @tag: referenced task tag for TMR_ABORT_TASK 1974 * @flags: submit cmd flags 1975 * 1976 * Callable from all contexts. 1977 **/ 1978 1979int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, 1980 unsigned char *sense, u64 unpacked_lun, 1981 void *fabric_tmr_ptr, unsigned char tm_type, 1982 gfp_t gfp, u64 tag, int flags) 1983{ 1984 struct se_portal_group *se_tpg; 1985 int ret; 1986 1987 se_tpg = se_sess->se_tpg; 1988 BUG_ON(!se_tpg); 1989 1990 __target_init_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 1991 0, DMA_NONE, TCM_SIMPLE_TAG, sense, unpacked_lun, 1992 se_sess->cmd_cnt); 1993 /* 1994 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req 1995 * allocation failure. 1996 */ 1997 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); 1998 if (ret < 0) 1999 return -ENOMEM; 2000 2001 if (tm_type == TMR_ABORT_TASK) 2002 se_cmd->se_tmr_req->ref_task_tag = tag; 2003 2004 /* See target_submit_cmd for commentary */ 2005 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); 2006 if (ret) { 2007 core_tmr_release_req(se_cmd->se_tmr_req); 2008 return ret; 2009 } 2010 2011 ret = transport_lookup_tmr_lun(se_cmd); 2012 if (ret) 2013 goto failure; 2014 2015 transport_generic_handle_tmr(se_cmd); 2016 return 0; 2017 2018 /* 2019 * For callback during failure handling, push this work off 2020 * to process context with TMR_LUN_DOES_NOT_EXIST status. 2021 */ 2022failure: 2023 INIT_WORK(&se_cmd->work, target_complete_tmr_failure); 2024 schedule_work(&se_cmd->work); 2025 return 0; 2026} 2027EXPORT_SYMBOL(target_submit_tmr); 2028 2029/* 2030 * Handle SAM-esque emulation for generic transport request failures. 2031 */ 2032void transport_generic_request_failure(struct se_cmd *cmd, 2033 sense_reason_t sense_reason) 2034{ 2035 int ret = 0, post_ret; 2036 2037 pr_debug("-----[ Storage Engine Exception; sense_reason %d\n", 2038 sense_reason); 2039 target_show_cmd("-----[ ", cmd); 2040 2041 /* 2042 * For SAM Task Attribute emulation for failed struct se_cmd 2043 */ 2044 transport_complete_task_attr(cmd); 2045 2046 if (cmd->transport_complete_callback) 2047 cmd->transport_complete_callback(cmd, false, &post_ret); 2048 2049 if (cmd->transport_state & CMD_T_ABORTED) { 2050 INIT_WORK(&cmd->work, target_abort_work); 2051 queue_work(target_completion_wq, &cmd->work); 2052 return; 2053 } 2054 2055 switch (sense_reason) { 2056 case TCM_NON_EXISTENT_LUN: 2057 case TCM_UNSUPPORTED_SCSI_OPCODE: 2058 case TCM_INVALID_CDB_FIELD: 2059 case TCM_INVALID_PARAMETER_LIST: 2060 case TCM_PARAMETER_LIST_LENGTH_ERROR: 2061 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: 2062 case TCM_UNKNOWN_MODE_PAGE: 2063 case TCM_WRITE_PROTECTED: 2064 case TCM_ADDRESS_OUT_OF_RANGE: 2065 case TCM_CHECK_CONDITION_ABORT_CMD: 2066 case TCM_CHECK_CONDITION_UNIT_ATTENTION: 2067 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: 2068 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: 2069 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: 2070 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE: 2071 case TCM_TOO_MANY_TARGET_DESCS: 2072 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE: 2073 case TCM_TOO_MANY_SEGMENT_DESCS: 2074 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE: 2075 case TCM_INVALID_FIELD_IN_COMMAND_IU: 2076 case TCM_ALUA_TG_PT_STANDBY: 2077 case TCM_ALUA_TG_PT_UNAVAILABLE: 2078 case TCM_ALUA_STATE_TRANSITION: 2079 case TCM_ALUA_OFFLINE: 2080 break; 2081 case TCM_OUT_OF_RESOURCES: 2082 cmd->scsi_status = SAM_STAT_TASK_SET_FULL; 2083 goto queue_status; 2084 case TCM_LUN_BUSY: 2085 cmd->scsi_status = SAM_STAT_BUSY; 2086 goto queue_status; 2087 case TCM_RESERVATION_CONFLICT: 2088 /* 2089 * No SENSE Data payload for this case, set SCSI Status 2090 * and queue the response to $FABRIC_MOD. 2091 * 2092 * Uses linux/include/scsi/scsi.h SAM status codes defs 2093 */ 2094 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; 2095 /* 2096 * For UA Interlock Code 11b, a RESERVATION CONFLICT will 2097 * establish a UNIT ATTENTION with PREVIOUS RESERVATION 2098 * CONFLICT STATUS. 2099 * 2100 * See spc4r17, section 7.4.6 Control Mode Page, Table 349 2101 */ 2102 if (cmd->se_sess && 2103 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl 2104 == TARGET_UA_INTLCK_CTRL_ESTABLISH_UA) { 2105 target_ua_allocate_lun(cmd->se_sess->se_node_acl, 2106 cmd->orig_fe_lun, 0x2C, 2107 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); 2108 } 2109 2110 goto queue_status; 2111 default: 2112 pr_err("Unknown transport error for CDB 0x%02x: %d\n", 2113 cmd->t_task_cdb[0], sense_reason); 2114 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 2115 break; 2116 } 2117 2118 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); 2119 if (ret) 2120 goto queue_full; 2121 2122check_stop: 2123 transport_lun_remove_cmd(cmd); 2124 transport_cmd_check_stop_to_fabric(cmd); 2125 return; 2126 2127queue_status: 2128 trace_target_cmd_complete(cmd); 2129 ret = cmd->se_tfo->queue_status(cmd); 2130 if (!ret) 2131 goto check_stop; 2132queue_full: 2133 transport_handle_queue_full(cmd, cmd->se_dev, ret, false); 2134} 2135EXPORT_SYMBOL(transport_generic_request_failure); 2136 2137void __target_execute_cmd(struct se_cmd *cmd, bool do_checks) 2138{ 2139 sense_reason_t ret; 2140 2141 if (!cmd->execute_cmd) { 2142 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2143 goto err; 2144 } 2145 if (do_checks) { 2146 /* 2147 * Check for an existing UNIT ATTENTION condition after 2148 * target_handle_task_attr() has done SAM task attr 2149 * checking, and possibly have already defered execution 2150 * out to target_restart_delayed_cmds() context. 2151 */ 2152 ret = target_scsi3_ua_check(cmd); 2153 if (ret) 2154 goto err; 2155 2156 ret = target_alua_state_check(cmd); 2157 if (ret) 2158 goto err; 2159 2160 ret = target_check_reservation(cmd); 2161 if (ret) { 2162 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; 2163 goto err; 2164 } 2165 } 2166 2167 ret = cmd->execute_cmd(cmd); 2168 if (!ret) 2169 return; 2170err: 2171 spin_lock_irq(&cmd->t_state_lock); 2172 cmd->transport_state &= ~CMD_T_SENT; 2173 spin_unlock_irq(&cmd->t_state_lock); 2174 2175 transport_generic_request_failure(cmd, ret); 2176} 2177 2178static int target_write_prot_action(struct se_cmd *cmd) 2179{ 2180 u32 sectors; 2181 /* 2182 * Perform WRITE_INSERT of PI using software emulation when backend 2183 * device has PI enabled, if the transport has not already generated 2184 * PI using hardware WRITE_INSERT offload. 2185 */ 2186 switch (cmd->prot_op) { 2187 case TARGET_PROT_DOUT_INSERT: 2188 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) 2189 sbc_dif_generate(cmd); 2190 break; 2191 case TARGET_PROT_DOUT_STRIP: 2192 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP) 2193 break; 2194 2195 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size); 2196 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, 2197 sectors, 0, cmd->t_prot_sg, 0); 2198 if (unlikely(cmd->pi_err)) { 2199 spin_lock_irq(&cmd->t_state_lock); 2200 cmd->transport_state &= ~CMD_T_SENT; 2201 spin_unlock_irq(&cmd->t_state_lock); 2202 transport_generic_request_failure(cmd, cmd->pi_err); 2203 return -1; 2204 } 2205 break; 2206 default: 2207 break; 2208 } 2209 2210 return 0; 2211} 2212 2213static bool target_handle_task_attr(struct se_cmd *cmd) 2214{ 2215 struct se_device *dev = cmd->se_dev; 2216 2217 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 2218 return false; 2219 2220 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET; 2221 2222 /* 2223 * Check for the existence of HEAD_OF_QUEUE, and if true return 1 2224 * to allow the passed struct se_cmd list of tasks to the front of the list. 2225 */ 2226 switch (cmd->sam_task_attr) { 2227 case TCM_HEAD_TAG: 2228 atomic_inc_mb(&dev->non_ordered); 2229 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n", 2230 cmd->t_task_cdb[0]); 2231 return false; 2232 case TCM_ORDERED_TAG: 2233 atomic_inc_mb(&dev->delayed_cmd_count); 2234 2235 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n", 2236 cmd->t_task_cdb[0]); 2237 break; 2238 default: 2239 /* 2240 * For SIMPLE and UNTAGGED Task Attribute commands 2241 */ 2242 atomic_inc_mb(&dev->non_ordered); 2243 2244 if (atomic_read(&dev->delayed_cmd_count) == 0) 2245 return false; 2246 break; 2247 } 2248 2249 if (cmd->sam_task_attr != TCM_ORDERED_TAG) { 2250 atomic_inc_mb(&dev->delayed_cmd_count); 2251 /* 2252 * We will account for this when we dequeue from the delayed 2253 * list. 2254 */ 2255 atomic_dec_mb(&dev->non_ordered); 2256 } 2257 2258 spin_lock_irq(&cmd->t_state_lock); 2259 cmd->transport_state &= ~CMD_T_SENT; 2260 spin_unlock_irq(&cmd->t_state_lock); 2261 2262 spin_lock(&dev->delayed_cmd_lock); 2263 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); 2264 spin_unlock(&dev->delayed_cmd_lock); 2265 2266 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn", 2267 cmd->t_task_cdb[0], cmd->sam_task_attr); 2268 /* 2269 * We may have no non ordered cmds when this function started or we 2270 * could have raced with the last simple/head cmd completing, so kick 2271 * the delayed handler here. 2272 */ 2273 schedule_work(&dev->delayed_cmd_work); 2274 return true; 2275} 2276 2277void target_execute_cmd(struct se_cmd *cmd) 2278{ 2279 /* 2280 * Determine if frontend context caller is requesting the stopping of 2281 * this command for frontend exceptions. 2282 * 2283 * If the received CDB has already been aborted stop processing it here. 2284 */ 2285 if (target_cmd_interrupted(cmd)) 2286 return; 2287 2288 spin_lock_irq(&cmd->t_state_lock); 2289 cmd->t_state = TRANSPORT_PROCESSING; 2290 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; 2291 spin_unlock_irq(&cmd->t_state_lock); 2292 2293 if (target_write_prot_action(cmd)) 2294 return; 2295 2296 if (target_handle_task_attr(cmd)) 2297 return; 2298 2299 __target_execute_cmd(cmd, true); 2300} 2301EXPORT_SYMBOL(target_execute_cmd); 2302 2303/* 2304 * Process all commands up to the last received ORDERED task attribute which 2305 * requires another blocking boundary 2306 */ 2307void target_do_delayed_work(struct work_struct *work) 2308{ 2309 struct se_device *dev = container_of(work, struct se_device, 2310 delayed_cmd_work); 2311 2312 spin_lock(&dev->delayed_cmd_lock); 2313 while (!dev->ordered_sync_in_progress) { 2314 struct se_cmd *cmd; 2315 2316 if (list_empty(&dev->delayed_cmd_list)) 2317 break; 2318 2319 cmd = list_entry(dev->delayed_cmd_list.next, 2320 struct se_cmd, se_delayed_node); 2321 2322 if (cmd->sam_task_attr == TCM_ORDERED_TAG) { 2323 /* 2324 * Check if we started with: 2325 * [ordered] [simple] [ordered] 2326 * and we are now at the last ordered so we have to wait 2327 * for the simple cmd. 2328 */ 2329 if (atomic_read(&dev->non_ordered) > 0) 2330 break; 2331 2332 dev->ordered_sync_in_progress = true; 2333 } 2334 2335 list_del(&cmd->se_delayed_node); 2336 atomic_dec_mb(&dev->delayed_cmd_count); 2337 spin_unlock(&dev->delayed_cmd_lock); 2338 2339 if (cmd->sam_task_attr != TCM_ORDERED_TAG) 2340 atomic_inc_mb(&dev->non_ordered); 2341 2342 cmd->transport_state |= CMD_T_SENT; 2343 2344 __target_execute_cmd(cmd, true); 2345 2346 spin_lock(&dev->delayed_cmd_lock); 2347 } 2348 spin_unlock(&dev->delayed_cmd_lock); 2349} 2350 2351/* 2352 * Called from I/O completion to determine which dormant/delayed 2353 * and ordered cmds need to have their tasks added to the execution queue. 2354 */ 2355static void transport_complete_task_attr(struct se_cmd *cmd) 2356{ 2357 struct se_device *dev = cmd->se_dev; 2358 2359 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 2360 return; 2361 2362 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET)) 2363 goto restart; 2364 2365 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { 2366 atomic_dec_mb(&dev->non_ordered); 2367 dev->dev_cur_ordered_id++; 2368 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) { 2369 atomic_dec_mb(&dev->non_ordered); 2370 dev->dev_cur_ordered_id++; 2371 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n", 2372 dev->dev_cur_ordered_id); 2373 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) { 2374 spin_lock(&dev->delayed_cmd_lock); 2375 dev->ordered_sync_in_progress = false; 2376 spin_unlock(&dev->delayed_cmd_lock); 2377 2378 dev->dev_cur_ordered_id++; 2379 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n", 2380 dev->dev_cur_ordered_id); 2381 } 2382 cmd->se_cmd_flags &= ~SCF_TASK_ATTR_SET; 2383 2384restart: 2385 if (atomic_read(&dev->delayed_cmd_count) > 0) 2386 schedule_work(&dev->delayed_cmd_work); 2387} 2388 2389static void transport_complete_qf(struct se_cmd *cmd) 2390{ 2391 int ret = 0; 2392 2393 transport_complete_task_attr(cmd); 2394 /* 2395 * If a fabric driver ->write_pending() or ->queue_data_in() callback 2396 * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and 2397 * the same callbacks should not be retried. Return CHECK_CONDITION 2398 * if a scsi_status is not already set. 2399 * 2400 * If a fabric driver ->queue_status() has returned non zero, always 2401 * keep retrying no matter what.. 2402 */ 2403 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) { 2404 if (cmd->scsi_status) 2405 goto queue_status; 2406 2407 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); 2408 goto queue_status; 2409 } 2410 2411 /* 2412 * Check if we need to send a sense buffer from 2413 * the struct se_cmd in question. We do NOT want 2414 * to take this path of the IO has been marked as 2415 * needing to be treated like a "normal read". This 2416 * is the case if it's a tape read, and either the 2417 * FM, EOM, or ILI bits are set, but there is no 2418 * sense data. 2419 */ 2420 if (!(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) && 2421 cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) 2422 goto queue_status; 2423 2424 switch (cmd->data_direction) { 2425 case DMA_FROM_DEVICE: 2426 /* queue status if not treating this as a normal read */ 2427 if (cmd->scsi_status && 2428 !(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL)) 2429 goto queue_status; 2430 2431 trace_target_cmd_complete(cmd); 2432 ret = cmd->se_tfo->queue_data_in(cmd); 2433 break; 2434 case DMA_TO_DEVICE: 2435 if (cmd->se_cmd_flags & SCF_BIDI) { 2436 ret = cmd->se_tfo->queue_data_in(cmd); 2437 break; 2438 } 2439 fallthrough; 2440 case DMA_NONE: 2441queue_status: 2442 trace_target_cmd_complete(cmd); 2443 ret = cmd->se_tfo->queue_status(cmd); 2444 break; 2445 default: 2446 break; 2447 } 2448 2449 if (ret < 0) { 2450 transport_handle_queue_full(cmd, cmd->se_dev, ret, false); 2451 return; 2452 } 2453 transport_lun_remove_cmd(cmd); 2454 transport_cmd_check_stop_to_fabric(cmd); 2455} 2456 2457static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev, 2458 int err, bool write_pending) 2459{ 2460 /* 2461 * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or 2462 * ->queue_data_in() callbacks from new process context. 2463 * 2464 * Otherwise for other errors, transport_complete_qf() will send 2465 * CHECK_CONDITION via ->queue_status() instead of attempting to 2466 * retry associated fabric driver data-transfer callbacks. 2467 */ 2468 if (err == -EAGAIN || err == -ENOMEM) { 2469 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP : 2470 TRANSPORT_COMPLETE_QF_OK; 2471 } else { 2472 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err); 2473 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR; 2474 } 2475 2476 spin_lock_irq(&dev->qf_cmd_lock); 2477 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); 2478 atomic_inc_mb(&dev->dev_qf_count); 2479 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); 2480 2481 schedule_work(&cmd->se_dev->qf_work_queue); 2482} 2483 2484static bool target_read_prot_action(struct se_cmd *cmd) 2485{ 2486 switch (cmd->prot_op) { 2487 case TARGET_PROT_DIN_STRIP: 2488 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { 2489 u32 sectors = cmd->data_length >> 2490 ilog2(cmd->se_dev->dev_attrib.block_size); 2491 2492 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, 2493 sectors, 0, cmd->t_prot_sg, 2494 0); 2495 if (cmd->pi_err) 2496 return true; 2497 } 2498 break; 2499 case TARGET_PROT_DIN_INSERT: 2500 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT) 2501 break; 2502 2503 sbc_dif_generate(cmd); 2504 break; 2505 default: 2506 break; 2507 } 2508 2509 return false; 2510} 2511 2512static void target_complete_ok_work(struct work_struct *work) 2513{ 2514 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 2515 int ret; 2516 2517 /* 2518 * Check if we need to move delayed/dormant tasks from cmds on the 2519 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task 2520 * Attribute. 2521 */ 2522 transport_complete_task_attr(cmd); 2523 2524 /* 2525 * Check to schedule QUEUE_FULL work, or execute an existing 2526 * cmd->transport_qf_callback() 2527 */ 2528 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) 2529 schedule_work(&cmd->se_dev->qf_work_queue); 2530 2531 /* 2532 * Check if we need to send a sense buffer from 2533 * the struct se_cmd in question. We do NOT want 2534 * to take this path of the IO has been marked as 2535 * needing to be treated like a "normal read". This 2536 * is the case if it's a tape read, and either the 2537 * FM, EOM, or ILI bits are set, but there is no 2538 * sense data. 2539 */ 2540 if (!(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) && 2541 cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { 2542 WARN_ON(!cmd->scsi_status); 2543 ret = transport_send_check_condition_and_sense( 2544 cmd, 0, 1); 2545 if (ret) 2546 goto queue_full; 2547 2548 transport_lun_remove_cmd(cmd); 2549 transport_cmd_check_stop_to_fabric(cmd); 2550 return; 2551 } 2552 /* 2553 * Check for a callback, used by amongst other things 2554 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. 2555 */ 2556 if (cmd->transport_complete_callback) { 2557 sense_reason_t rc; 2558 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE); 2559 bool zero_dl = !(cmd->data_length); 2560 int post_ret = 0; 2561 2562 rc = cmd->transport_complete_callback(cmd, true, &post_ret); 2563 if (!rc && !post_ret) { 2564 if (caw && zero_dl) 2565 goto queue_rsp; 2566 2567 return; 2568 } else if (rc) { 2569 ret = transport_send_check_condition_and_sense(cmd, 2570 rc, 0); 2571 if (ret) 2572 goto queue_full; 2573 2574 transport_lun_remove_cmd(cmd); 2575 transport_cmd_check_stop_to_fabric(cmd); 2576 return; 2577 } 2578 } 2579 2580queue_rsp: 2581 switch (cmd->data_direction) { 2582 case DMA_FROM_DEVICE: 2583 /* 2584 * if this is a READ-type IO, but SCSI status 2585 * is set, then skip returning data and just 2586 * return the status -- unless this IO is marked 2587 * as needing to be treated as a normal read, 2588 * in which case we want to go ahead and return 2589 * the data. This happens, for example, for tape 2590 * reads with the FM, EOM, or ILI bits set, with 2591 * no sense data. 2592 */ 2593 if (cmd->scsi_status && 2594 !(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL)) 2595 goto queue_status; 2596 2597 atomic_long_add(cmd->data_length, 2598 &cmd->se_lun->lun_stats.tx_data_octets); 2599 /* 2600 * Perform READ_STRIP of PI using software emulation when 2601 * backend had PI enabled, if the transport will not be 2602 * performing hardware READ_STRIP offload. 2603 */ 2604 if (target_read_prot_action(cmd)) { 2605 ret = transport_send_check_condition_and_sense(cmd, 2606 cmd->pi_err, 0); 2607 if (ret) 2608 goto queue_full; 2609 2610 transport_lun_remove_cmd(cmd); 2611 transport_cmd_check_stop_to_fabric(cmd); 2612 return; 2613 } 2614 2615 trace_target_cmd_complete(cmd); 2616 ret = cmd->se_tfo->queue_data_in(cmd); 2617 if (ret) 2618 goto queue_full; 2619 break; 2620 case DMA_TO_DEVICE: 2621 atomic_long_add(cmd->data_length, 2622 &cmd->se_lun->lun_stats.rx_data_octets); 2623 /* 2624 * Check if we need to send READ payload for BIDI-COMMAND 2625 */ 2626 if (cmd->se_cmd_flags & SCF_BIDI) { 2627 atomic_long_add(cmd->data_length, 2628 &cmd->se_lun->lun_stats.tx_data_octets); 2629 ret = cmd->se_tfo->queue_data_in(cmd); 2630 if (ret) 2631 goto queue_full; 2632 break; 2633 } 2634 fallthrough; 2635 case DMA_NONE: 2636queue_status: 2637 trace_target_cmd_complete(cmd); 2638 ret = cmd->se_tfo->queue_status(cmd); 2639 if (ret) 2640 goto queue_full; 2641 break; 2642 default: 2643 break; 2644 } 2645 2646 transport_lun_remove_cmd(cmd); 2647 transport_cmd_check_stop_to_fabric(cmd); 2648 return; 2649 2650queue_full: 2651 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," 2652 " data_direction: %d\n", cmd, cmd->data_direction); 2653 2654 transport_handle_queue_full(cmd, cmd->se_dev, ret, false); 2655} 2656 2657void target_free_sgl(struct scatterlist *sgl, int nents) 2658{ 2659 sgl_free_n_order(sgl, nents, 0); 2660} 2661EXPORT_SYMBOL(target_free_sgl); 2662 2663static inline void transport_reset_sgl_orig(struct se_cmd *cmd) 2664{ 2665 /* 2666 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE 2667 * emulation, and free + reset pointers if necessary.. 2668 */ 2669 if (!cmd->t_data_sg_orig) 2670 return; 2671 2672 kfree(cmd->t_data_sg); 2673 cmd->t_data_sg = cmd->t_data_sg_orig; 2674 cmd->t_data_sg_orig = NULL; 2675 cmd->t_data_nents = cmd->t_data_nents_orig; 2676 cmd->t_data_nents_orig = 0; 2677} 2678 2679static inline void transport_free_pages(struct se_cmd *cmd) 2680{ 2681 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { 2682 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); 2683 cmd->t_prot_sg = NULL; 2684 cmd->t_prot_nents = 0; 2685 } 2686 2687 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { 2688 /* 2689 * Release special case READ buffer payload required for 2690 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE 2691 */ 2692 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { 2693 target_free_sgl(cmd->t_bidi_data_sg, 2694 cmd->t_bidi_data_nents); 2695 cmd->t_bidi_data_sg = NULL; 2696 cmd->t_bidi_data_nents = 0; 2697 } 2698 transport_reset_sgl_orig(cmd); 2699 return; 2700 } 2701 transport_reset_sgl_orig(cmd); 2702 2703 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents); 2704 cmd->t_data_sg = NULL; 2705 cmd->t_data_nents = 0; 2706 2707 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); 2708 cmd->t_bidi_data_sg = NULL; 2709 cmd->t_bidi_data_nents = 0; 2710} 2711 2712void *transport_kmap_data_sg(struct se_cmd *cmd) 2713{ 2714 struct scatterlist *sg = cmd->t_data_sg; 2715 struct page **pages; 2716 int i; 2717 2718 /* 2719 * We need to take into account a possible offset here for fabrics like 2720 * tcm_loop who may be using a contig buffer from the SCSI midlayer for 2721 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() 2722 */ 2723 if (!cmd->t_data_nents) 2724 return NULL; 2725 2726 BUG_ON(!sg); 2727 if (cmd->t_data_nents == 1) 2728 return kmap(sg_page(sg)) + sg->offset; 2729 2730 /* >1 page. use vmap */ 2731 pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL); 2732 if (!pages) 2733 return NULL; 2734 2735 /* convert sg[] to pages[] */ 2736 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { 2737 pages[i] = sg_page(sg); 2738 } 2739 2740 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); 2741 kfree(pages); 2742 if (!cmd->t_data_vmap) 2743 return NULL; 2744 2745 return cmd->t_data_vmap + cmd->t_data_sg[0].offset; 2746} 2747EXPORT_SYMBOL(transport_kmap_data_sg); 2748 2749void transport_kunmap_data_sg(struct se_cmd *cmd) 2750{ 2751 if (!cmd->t_data_nents) { 2752 return; 2753 } else if (cmd->t_data_nents == 1) { 2754 kunmap(sg_page(cmd->t_data_sg)); 2755 return; 2756 } 2757 2758 vunmap(cmd->t_data_vmap); 2759 cmd->t_data_vmap = NULL; 2760} 2761EXPORT_SYMBOL(transport_kunmap_data_sg); 2762 2763int 2764target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, 2765 bool zero_page, bool chainable) 2766{ 2767 gfp_t gfp = GFP_KERNEL | (zero_page ? __GFP_ZERO : 0); 2768 2769 *sgl = sgl_alloc_order(length, 0, chainable, gfp, nents); 2770 return *sgl ? 0 : -ENOMEM; 2771} 2772EXPORT_SYMBOL(target_alloc_sgl); 2773 2774/* 2775 * Allocate any required resources to execute the command. For writes we 2776 * might not have the payload yet, so notify the fabric via a call to 2777 * ->write_pending instead. Otherwise place it on the execution queue. 2778 */ 2779sense_reason_t 2780transport_generic_new_cmd(struct se_cmd *cmd) 2781{ 2782 unsigned long flags; 2783 int ret = 0; 2784 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); 2785 2786 if (cmd->prot_op != TARGET_PROT_NORMAL && 2787 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { 2788 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents, 2789 cmd->prot_length, true, false); 2790 if (ret < 0) 2791 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2792 } 2793 2794 /* 2795 * Determine if the TCM fabric module has already allocated physical 2796 * memory, and is directly calling transport_generic_map_mem_to_cmd() 2797 * beforehand. 2798 */ 2799 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && 2800 cmd->data_length) { 2801 2802 if ((cmd->se_cmd_flags & SCF_BIDI) || 2803 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { 2804 u32 bidi_length; 2805 2806 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) 2807 bidi_length = cmd->t_task_nolb * 2808 cmd->se_dev->dev_attrib.block_size; 2809 else 2810 bidi_length = cmd->data_length; 2811 2812 ret = target_alloc_sgl(&cmd->t_bidi_data_sg, 2813 &cmd->t_bidi_data_nents, 2814 bidi_length, zero_flag, false); 2815 if (ret < 0) 2816 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2817 } 2818 2819 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, 2820 cmd->data_length, zero_flag, false); 2821 if (ret < 0) 2822 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2823 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && 2824 cmd->data_length) { 2825 /* 2826 * Special case for COMPARE_AND_WRITE with fabrics 2827 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC. 2828 */ 2829 u32 caw_length = cmd->t_task_nolb * 2830 cmd->se_dev->dev_attrib.block_size; 2831 2832 ret = target_alloc_sgl(&cmd->t_bidi_data_sg, 2833 &cmd->t_bidi_data_nents, 2834 caw_length, zero_flag, false); 2835 if (ret < 0) 2836 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2837 } 2838 /* 2839 * If this command is not a write we can execute it right here, 2840 * for write buffers we need to notify the fabric driver first 2841 * and let it call back once the write buffers are ready. 2842 */ 2843 target_add_to_state_list(cmd); 2844 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) { 2845 target_execute_cmd(cmd); 2846 return 0; 2847 } 2848 2849 spin_lock_irqsave(&cmd->t_state_lock, flags); 2850 cmd->t_state = TRANSPORT_WRITE_PENDING; 2851 /* 2852 * Determine if frontend context caller is requesting the stopping of 2853 * this command for frontend exceptions. 2854 */ 2855 if (cmd->transport_state & CMD_T_STOP && 2856 !cmd->se_tfo->write_pending_must_be_called) { 2857 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", 2858 __func__, __LINE__, cmd->tag); 2859 2860 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2861 2862 complete_all(&cmd->t_transport_stop_comp); 2863 return 0; 2864 } 2865 cmd->transport_state &= ~CMD_T_ACTIVE; 2866 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2867 2868 ret = cmd->se_tfo->write_pending(cmd); 2869 if (ret) 2870 goto queue_full; 2871 2872 return 0; 2873 2874queue_full: 2875 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); 2876 transport_handle_queue_full(cmd, cmd->se_dev, ret, true); 2877 return 0; 2878} 2879EXPORT_SYMBOL(transport_generic_new_cmd); 2880 2881static void transport_write_pending_qf(struct se_cmd *cmd) 2882{ 2883 unsigned long flags; 2884 int ret; 2885 bool stop; 2886 2887 spin_lock_irqsave(&cmd->t_state_lock, flags); 2888 stop = (cmd->transport_state & (CMD_T_STOP | CMD_T_ABORTED)); 2889 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2890 2891 if (stop) { 2892 pr_debug("%s:%d CMD_T_STOP|CMD_T_ABORTED for ITT: 0x%08llx\n", 2893 __func__, __LINE__, cmd->tag); 2894 complete_all(&cmd->t_transport_stop_comp); 2895 return; 2896 } 2897 2898 ret = cmd->se_tfo->write_pending(cmd); 2899 if (ret) { 2900 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", 2901 cmd); 2902 transport_handle_queue_full(cmd, cmd->se_dev, ret, true); 2903 } 2904} 2905 2906static bool 2907__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *, 2908 unsigned long *flags); 2909 2910static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas) 2911{ 2912 unsigned long flags; 2913 2914 spin_lock_irqsave(&cmd->t_state_lock, flags); 2915 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags); 2916 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2917} 2918 2919/* 2920 * Call target_put_sess_cmd() and wait until target_release_cmd_kref(@cmd) has 2921 * finished. 2922 */ 2923void target_put_cmd_and_wait(struct se_cmd *cmd) 2924{ 2925 DECLARE_COMPLETION_ONSTACK(compl); 2926 2927 WARN_ON_ONCE(cmd->abrt_compl); 2928 cmd->abrt_compl = &compl; 2929 target_put_sess_cmd(cmd); 2930 wait_for_completion(&compl); 2931} 2932 2933/* 2934 * This function is called by frontend drivers after processing of a command 2935 * has finished. 2936 * 2937 * The protocol for ensuring that either the regular frontend command 2938 * processing flow or target_handle_abort() code drops one reference is as 2939 * follows: 2940 * - Calling .queue_data_in(), .queue_status() or queue_tm_rsp() will cause 2941 * the frontend driver to call this function synchronously or asynchronously. 2942 * That will cause one reference to be dropped. 2943 * - During regular command processing the target core sets CMD_T_COMPLETE 2944 * before invoking one of the .queue_*() functions. 2945 * - The code that aborts commands skips commands and TMFs for which 2946 * CMD_T_COMPLETE has been set. 2947 * - CMD_T_ABORTED is set atomically after the CMD_T_COMPLETE check for 2948 * commands that will be aborted. 2949 * - If the CMD_T_ABORTED flag is set but CMD_T_TAS has not been set 2950 * transport_generic_free_cmd() skips its call to target_put_sess_cmd(). 2951 * - For aborted commands for which CMD_T_TAS has been set .queue_status() will 2952 * be called and will drop a reference. 2953 * - For aborted commands for which CMD_T_TAS has not been set .aborted_task() 2954 * will be called. target_handle_abort() will drop the final reference. 2955 */ 2956int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) 2957{ 2958 DECLARE_COMPLETION_ONSTACK(compl); 2959 int ret = 0; 2960 bool aborted = false, tas = false; 2961 2962 if (wait_for_tasks) 2963 target_wait_free_cmd(cmd, &aborted, &tas); 2964 2965 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) { 2966 /* 2967 * Handle WRITE failure case where transport_generic_new_cmd() 2968 * has already added se_cmd to state_list, but fabric has 2969 * failed command before I/O submission. 2970 */ 2971 if (cmd->state_active) 2972 target_remove_from_state_list(cmd); 2973 2974 if (cmd->se_lun) 2975 transport_lun_remove_cmd(cmd); 2976 } 2977 if (aborted) 2978 cmd->free_compl = &compl; 2979 ret = target_put_sess_cmd(cmd); 2980 if (aborted) { 2981 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag); 2982 wait_for_completion(&compl); 2983 ret = 1; 2984 } 2985 return ret; 2986} 2987EXPORT_SYMBOL(transport_generic_free_cmd); 2988 2989/** 2990 * target_get_sess_cmd - Verify the session is accepting cmds and take ref 2991 * @se_cmd: command descriptor to add 2992 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() 2993 */ 2994int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) 2995{ 2996 int ret = 0; 2997 2998 /* 2999 * Add a second kref if the fabric caller is expecting to handle 3000 * fabric acknowledgement that requires two target_put_sess_cmd() 3001 * invocations before se_cmd descriptor release. 3002 */ 3003 if (ack_kref) { 3004 kref_get(&se_cmd->cmd_kref); 3005 se_cmd->se_cmd_flags |= SCF_ACK_KREF; 3006 } 3007 3008 /* 3009 * Users like xcopy do not use counters since they never do a stop 3010 * and wait. 3011 */ 3012 if (se_cmd->cmd_cnt) { 3013 if (!percpu_ref_tryget_live(&se_cmd->cmd_cnt->refcnt)) 3014 ret = -ESHUTDOWN; 3015 } 3016 if (ret && ack_kref) 3017 target_put_sess_cmd(se_cmd); 3018 3019 return ret; 3020} 3021EXPORT_SYMBOL(target_get_sess_cmd); 3022 3023static void target_free_cmd_mem(struct se_cmd *cmd) 3024{ 3025 transport_free_pages(cmd); 3026 3027 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 3028 core_tmr_release_req(cmd->se_tmr_req); 3029 if (cmd->t_task_cdb != cmd->__t_task_cdb) 3030 kfree(cmd->t_task_cdb); 3031} 3032 3033static void target_release_cmd_kref(struct kref *kref) 3034{ 3035 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); 3036 struct target_cmd_counter *cmd_cnt = se_cmd->cmd_cnt; 3037 struct completion *free_compl = se_cmd->free_compl; 3038 struct completion *abrt_compl = se_cmd->abrt_compl; 3039 3040 target_free_cmd_mem(se_cmd); 3041 se_cmd->se_tfo->release_cmd(se_cmd); 3042 if (free_compl) 3043 complete(free_compl); 3044 if (abrt_compl) 3045 complete(abrt_compl); 3046 3047 if (cmd_cnt) 3048 percpu_ref_put(&cmd_cnt->refcnt); 3049} 3050 3051/** 3052 * target_put_sess_cmd - decrease the command reference count 3053 * @se_cmd: command to drop a reference from 3054 * 3055 * Returns 1 if and only if this target_put_sess_cmd() call caused the 3056 * refcount to drop to zero. Returns zero otherwise. 3057 */ 3058int target_put_sess_cmd(struct se_cmd *se_cmd) 3059{ 3060 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); 3061} 3062EXPORT_SYMBOL(target_put_sess_cmd); 3063 3064static const char *data_dir_name(enum dma_data_direction d) 3065{ 3066 switch (d) { 3067 case DMA_BIDIRECTIONAL: return "BIDI"; 3068 case DMA_TO_DEVICE: return "WRITE"; 3069 case DMA_FROM_DEVICE: return "READ"; 3070 case DMA_NONE: return "NONE"; 3071 } 3072 3073 return "(?)"; 3074} 3075 3076static const char *cmd_state_name(enum transport_state_table t) 3077{ 3078 switch (t) { 3079 case TRANSPORT_NO_STATE: return "NO_STATE"; 3080 case TRANSPORT_NEW_CMD: return "NEW_CMD"; 3081 case TRANSPORT_WRITE_PENDING: return "WRITE_PENDING"; 3082 case TRANSPORT_PROCESSING: return "PROCESSING"; 3083 case TRANSPORT_COMPLETE: return "COMPLETE"; 3084 case TRANSPORT_ISTATE_PROCESSING: 3085 return "ISTATE_PROCESSING"; 3086 case TRANSPORT_COMPLETE_QF_WP: return "COMPLETE_QF_WP"; 3087 case TRANSPORT_COMPLETE_QF_OK: return "COMPLETE_QF_OK"; 3088 case TRANSPORT_COMPLETE_QF_ERR: return "COMPLETE_QF_ERR"; 3089 } 3090 3091 return "(?)"; 3092} 3093 3094static void target_append_str(char **str, const char *txt) 3095{ 3096 char *prev = *str; 3097 3098 *str = *str ? kasprintf(GFP_ATOMIC, "%s,%s", *str, txt) : 3099 kstrdup(txt, GFP_ATOMIC); 3100 kfree(prev); 3101} 3102 3103/* 3104 * Convert a transport state bitmask into a string. The caller is 3105 * responsible for freeing the returned pointer. 3106 */ 3107static char *target_ts_to_str(u32 ts) 3108{ 3109 char *str = NULL; 3110 3111 if (ts & CMD_T_ABORTED) 3112 target_append_str(&str, "aborted"); 3113 if (ts & CMD_T_ACTIVE) 3114 target_append_str(&str, "active"); 3115 if (ts & CMD_T_COMPLETE) 3116 target_append_str(&str, "complete"); 3117 if (ts & CMD_T_SENT) 3118 target_append_str(&str, "sent"); 3119 if (ts & CMD_T_STOP) 3120 target_append_str(&str, "stop"); 3121 if (ts & CMD_T_FABRIC_STOP) 3122 target_append_str(&str, "fabric_stop"); 3123 3124 return str; 3125} 3126 3127static const char *target_tmf_name(enum tcm_tmreq_table tmf) 3128{ 3129 switch (tmf) { 3130 case TMR_ABORT_TASK: return "ABORT_TASK"; 3131 case TMR_ABORT_TASK_SET: return "ABORT_TASK_SET"; 3132 case TMR_CLEAR_ACA: return "CLEAR_ACA"; 3133 case TMR_CLEAR_TASK_SET: return "CLEAR_TASK_SET"; 3134 case TMR_LUN_RESET: return "LUN_RESET"; 3135 case TMR_TARGET_WARM_RESET: return "TARGET_WARM_RESET"; 3136 case TMR_TARGET_COLD_RESET: return "TARGET_COLD_RESET"; 3137 case TMR_LUN_RESET_PRO: return "LUN_RESET_PRO"; 3138 case TMR_UNKNOWN: break; 3139 } 3140 return "(?)"; 3141} 3142 3143void target_show_cmd(const char *pfx, struct se_cmd *cmd) 3144{ 3145 char *ts_str = target_ts_to_str(cmd->transport_state); 3146 const u8 *cdb = cmd->t_task_cdb; 3147 struct se_tmr_req *tmf = cmd->se_tmr_req; 3148 3149 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { 3150 pr_debug("%scmd %#02x:%#02x with tag %#llx dir %s i_state %d t_state %s len %d refcnt %d transport_state %s\n", 3151 pfx, cdb[0], cdb[1], cmd->tag, 3152 data_dir_name(cmd->data_direction), 3153 cmd->se_tfo->get_cmd_state(cmd), 3154 cmd_state_name(cmd->t_state), cmd->data_length, 3155 kref_read(&cmd->cmd_kref), ts_str); 3156 } else { 3157 pr_debug("%stmf %s with tag %#llx ref_task_tag %#llx i_state %d t_state %s refcnt %d transport_state %s\n", 3158 pfx, target_tmf_name(tmf->function), cmd->tag, 3159 tmf->ref_task_tag, cmd->se_tfo->get_cmd_state(cmd), 3160 cmd_state_name(cmd->t_state), 3161 kref_read(&cmd->cmd_kref), ts_str); 3162 } 3163 kfree(ts_str); 3164} 3165EXPORT_SYMBOL(target_show_cmd); 3166 3167static void target_stop_cmd_counter_confirm(struct percpu_ref *ref) 3168{ 3169 struct target_cmd_counter *cmd_cnt = container_of(ref, 3170 struct target_cmd_counter, 3171 refcnt); 3172 complete_all(&cmd_cnt->stop_done); 3173} 3174 3175/** 3176 * target_stop_cmd_counter - Stop new IO from being added to the counter. 3177 * @cmd_cnt: counter to stop 3178 */ 3179void target_stop_cmd_counter(struct target_cmd_counter *cmd_cnt) 3180{ 3181 pr_debug("Stopping command counter.\n"); 3182 if (!atomic_cmpxchg(&cmd_cnt->stopped, 0, 1)) 3183 percpu_ref_kill_and_confirm(&cmd_cnt->refcnt, 3184 target_stop_cmd_counter_confirm); 3185} 3186EXPORT_SYMBOL_GPL(target_stop_cmd_counter); 3187 3188/** 3189 * target_stop_session - Stop new IO from being queued on the session. 3190 * @se_sess: session to stop 3191 */ 3192void target_stop_session(struct se_session *se_sess) 3193{ 3194 target_stop_cmd_counter(se_sess->cmd_cnt); 3195} 3196EXPORT_SYMBOL(target_stop_session); 3197 3198/** 3199 * target_wait_for_cmds - Wait for outstanding cmds. 3200 * @cmd_cnt: counter to wait for active I/O for. 3201 */ 3202void target_wait_for_cmds(struct target_cmd_counter *cmd_cnt) 3203{ 3204 int ret; 3205 3206 WARN_ON_ONCE(!atomic_read(&cmd_cnt->stopped)); 3207 3208 do { 3209 pr_debug("Waiting for running cmds to complete.\n"); 3210 ret = wait_event_timeout(cmd_cnt->refcnt_wq, 3211 percpu_ref_is_zero(&cmd_cnt->refcnt), 3212 180 * HZ); 3213 } while (ret <= 0); 3214 3215 wait_for_completion(&cmd_cnt->stop_done); 3216 pr_debug("Waiting for cmds done.\n"); 3217} 3218EXPORT_SYMBOL_GPL(target_wait_for_cmds); 3219 3220/** 3221 * target_wait_for_sess_cmds - Wait for outstanding commands 3222 * @se_sess: session to wait for active I/O 3223 */ 3224void target_wait_for_sess_cmds(struct se_session *se_sess) 3225{ 3226 target_wait_for_cmds(se_sess->cmd_cnt); 3227} 3228EXPORT_SYMBOL(target_wait_for_sess_cmds); 3229 3230/* 3231 * Prevent that new percpu_ref_tryget_live() calls succeed and wait until 3232 * all references to the LUN have been released. Called during LUN shutdown. 3233 */ 3234void transport_clear_lun_ref(struct se_lun *lun) 3235{ 3236 percpu_ref_kill(&lun->lun_ref); 3237 wait_for_completion(&lun->lun_shutdown_comp); 3238} 3239 3240static bool 3241__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop, 3242 bool *aborted, bool *tas, unsigned long *flags) 3243 __releases(&cmd->t_state_lock) 3244 __acquires(&cmd->t_state_lock) 3245{ 3246 lockdep_assert_held(&cmd->t_state_lock); 3247 3248 if (fabric_stop) 3249 cmd->transport_state |= CMD_T_FABRIC_STOP; 3250 3251 if (cmd->transport_state & CMD_T_ABORTED) 3252 *aborted = true; 3253 3254 if (cmd->transport_state & CMD_T_TAS) 3255 *tas = true; 3256 3257 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && 3258 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) 3259 return false; 3260 3261 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && 3262 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) 3263 return false; 3264 3265 if (!(cmd->transport_state & CMD_T_ACTIVE)) 3266 return false; 3267 3268 if (fabric_stop && *aborted) 3269 return false; 3270 3271 cmd->transport_state |= CMD_T_STOP; 3272 3273 target_show_cmd("wait_for_tasks: Stopping ", cmd); 3274 3275 spin_unlock_irqrestore(&cmd->t_state_lock, *flags); 3276 3277 while (!wait_for_completion_timeout(&cmd->t_transport_stop_comp, 3278 180 * HZ)) 3279 target_show_cmd("wait for tasks: ", cmd); 3280 3281 spin_lock_irqsave(&cmd->t_state_lock, *flags); 3282 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); 3283 3284 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->" 3285 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag); 3286 3287 return true; 3288} 3289 3290/** 3291 * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp 3292 * @cmd: command to wait on 3293 */ 3294bool transport_wait_for_tasks(struct se_cmd *cmd) 3295{ 3296 unsigned long flags; 3297 bool ret, aborted = false, tas = false; 3298 3299 spin_lock_irqsave(&cmd->t_state_lock, flags); 3300 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags); 3301 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 3302 3303 return ret; 3304} 3305EXPORT_SYMBOL(transport_wait_for_tasks); 3306 3307struct sense_detail { 3308 u8 key; 3309 u8 asc; 3310 u8 ascq; 3311 bool add_sense_info; 3312}; 3313 3314static const struct sense_detail sense_detail_table[] = { 3315 [TCM_NO_SENSE] = { 3316 .key = NOT_READY 3317 }, 3318 [TCM_NON_EXISTENT_LUN] = { 3319 .key = ILLEGAL_REQUEST, 3320 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */ 3321 }, 3322 [TCM_UNSUPPORTED_SCSI_OPCODE] = { 3323 .key = ILLEGAL_REQUEST, 3324 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ 3325 }, 3326 [TCM_SECTOR_COUNT_TOO_MANY] = { 3327 .key = ILLEGAL_REQUEST, 3328 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ 3329 }, 3330 [TCM_UNKNOWN_MODE_PAGE] = { 3331 .key = ILLEGAL_REQUEST, 3332 .asc = 0x24, /* INVALID FIELD IN CDB */ 3333 }, 3334 [TCM_CHECK_CONDITION_ABORT_CMD] = { 3335 .key = ABORTED_COMMAND, 3336 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */ 3337 .ascq = 0x03, 3338 }, 3339 [TCM_INCORRECT_AMOUNT_OF_DATA] = { 3340 .key = ABORTED_COMMAND, 3341 .asc = 0x0c, /* WRITE ERROR */ 3342 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */ 3343 }, 3344 [TCM_INVALID_CDB_FIELD] = { 3345 .key = ILLEGAL_REQUEST, 3346 .asc = 0x24, /* INVALID FIELD IN CDB */ 3347 }, 3348 [TCM_INVALID_PARAMETER_LIST] = { 3349 .key = ILLEGAL_REQUEST, 3350 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */ 3351 }, 3352 [TCM_TOO_MANY_TARGET_DESCS] = { 3353 .key = ILLEGAL_REQUEST, 3354 .asc = 0x26, 3355 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */ 3356 }, 3357 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = { 3358 .key = ILLEGAL_REQUEST, 3359 .asc = 0x26, 3360 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */ 3361 }, 3362 [TCM_TOO_MANY_SEGMENT_DESCS] = { 3363 .key = ILLEGAL_REQUEST, 3364 .asc = 0x26, 3365 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */ 3366 }, 3367 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = { 3368 .key = ILLEGAL_REQUEST, 3369 .asc = 0x26, 3370 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */ 3371 }, 3372 [TCM_PARAMETER_LIST_LENGTH_ERROR] = { 3373 .key = ILLEGAL_REQUEST, 3374 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */ 3375 }, 3376 [TCM_UNEXPECTED_UNSOLICITED_DATA] = { 3377 .key = ILLEGAL_REQUEST, 3378 .asc = 0x0c, /* WRITE ERROR */ 3379 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */ 3380 }, 3381 [TCM_SERVICE_CRC_ERROR] = { 3382 .key = ABORTED_COMMAND, 3383 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */ 3384 .ascq = 0x05, /* N/A */ 3385 }, 3386 [TCM_SNACK_REJECTED] = { 3387 .key = ABORTED_COMMAND, 3388 .asc = 0x11, /* READ ERROR */ 3389 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */ 3390 }, 3391 [TCM_WRITE_PROTECTED] = { 3392 .key = DATA_PROTECT, 3393 .asc = 0x27, /* WRITE PROTECTED */ 3394 }, 3395 [TCM_ADDRESS_OUT_OF_RANGE] = { 3396 .key = ILLEGAL_REQUEST, 3397 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ 3398 }, 3399 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = { 3400 .key = UNIT_ATTENTION, 3401 }, 3402 [TCM_MISCOMPARE_VERIFY] = { 3403 .key = MISCOMPARE, 3404 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */ 3405 .ascq = 0x00, 3406 .add_sense_info = true, 3407 }, 3408 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = { 3409 .key = ABORTED_COMMAND, 3410 .asc = 0x10, 3411 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */ 3412 .add_sense_info = true, 3413 }, 3414 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = { 3415 .key = ABORTED_COMMAND, 3416 .asc = 0x10, 3417 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ 3418 .add_sense_info = true, 3419 }, 3420 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = { 3421 .key = ABORTED_COMMAND, 3422 .asc = 0x10, 3423 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ 3424 .add_sense_info = true, 3425 }, 3426 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = { 3427 .key = COPY_ABORTED, 3428 .asc = 0x0d, 3429 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */ 3430 3431 }, 3432 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = { 3433 /* 3434 * Returning ILLEGAL REQUEST would cause immediate IO errors on 3435 * Solaris initiators. Returning NOT READY instead means the 3436 * operations will be retried a finite number of times and we 3437 * can survive intermittent errors. 3438 */ 3439 .key = NOT_READY, 3440 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */ 3441 }, 3442 [TCM_INSUFFICIENT_REGISTRATION_RESOURCES] = { 3443 /* 3444 * From spc4r22 section5.7.7,5.7.8 3445 * If a PERSISTENT RESERVE OUT command with a REGISTER service action 3446 * or a REGISTER AND IGNORE EXISTING KEY service action or 3447 * REGISTER AND MOVE service actionis attempted, 3448 * but there are insufficient device server resources to complete the 3449 * operation, then the command shall be terminated with CHECK CONDITION 3450 * status, with the sense key set to ILLEGAL REQUEST,and the additonal 3451 * sense code set to INSUFFICIENT REGISTRATION RESOURCES. 3452 */ 3453 .key = ILLEGAL_REQUEST, 3454 .asc = 0x55, 3455 .ascq = 0x04, /* INSUFFICIENT REGISTRATION RESOURCES */ 3456 }, 3457 [TCM_INVALID_FIELD_IN_COMMAND_IU] = { 3458 .key = ILLEGAL_REQUEST, 3459 .asc = 0x0e, 3460 .ascq = 0x03, /* INVALID FIELD IN COMMAND INFORMATION UNIT */ 3461 }, 3462 [TCM_ALUA_TG_PT_STANDBY] = { 3463 .key = NOT_READY, 3464 .asc = 0x04, 3465 .ascq = ASCQ_04H_ALUA_TG_PT_STANDBY, 3466 }, 3467 [TCM_ALUA_TG_PT_UNAVAILABLE] = { 3468 .key = NOT_READY, 3469 .asc = 0x04, 3470 .ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE, 3471 }, 3472 [TCM_ALUA_STATE_TRANSITION] = { 3473 .key = NOT_READY, 3474 .asc = 0x04, 3475 .ascq = ASCQ_04H_ALUA_STATE_TRANSITION, 3476 }, 3477 [TCM_ALUA_OFFLINE] = { 3478 .key = NOT_READY, 3479 .asc = 0x04, 3480 .ascq = ASCQ_04H_ALUA_OFFLINE, 3481 }, 3482}; 3483 3484/** 3485 * translate_sense_reason - translate a sense reason into T10 key, asc and ascq 3486 * @cmd: SCSI command in which the resulting sense buffer or SCSI status will 3487 * be stored. 3488 * @reason: LIO sense reason code. If this argument has the value 3489 * TCM_CHECK_CONDITION_UNIT_ATTENTION, try to dequeue a unit attention. If 3490 * dequeuing a unit attention fails due to multiple commands being processed 3491 * concurrently, set the command status to BUSY. 3492 * 3493 * Return: 0 upon success or -EINVAL if the sense buffer is too small. 3494 */ 3495static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason) 3496{ 3497 const struct sense_detail *sd; 3498 u8 *buffer = cmd->sense_buffer; 3499 int r = (__force int)reason; 3500 u8 key, asc, ascq; 3501 bool desc_format = target_sense_desc_format(cmd->se_dev); 3502 3503 if (r < ARRAY_SIZE(sense_detail_table) && sense_detail_table[r].key) 3504 sd = &sense_detail_table[r]; 3505 else 3506 sd = &sense_detail_table[(__force int) 3507 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE]; 3508 3509 key = sd->key; 3510 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) { 3511 if (!core_scsi3_ua_for_check_condition(cmd, &key, &asc, 3512 &ascq)) { 3513 cmd->scsi_status = SAM_STAT_BUSY; 3514 return; 3515 } 3516 } else { 3517 WARN_ON_ONCE(sd->asc == 0); 3518 asc = sd->asc; 3519 ascq = sd->ascq; 3520 } 3521 3522 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; 3523 cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 3524 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; 3525 scsi_build_sense_buffer(desc_format, buffer, key, asc, ascq); 3526 if (sd->add_sense_info) 3527 WARN_ON_ONCE(scsi_set_sense_information(buffer, 3528 cmd->scsi_sense_length, 3529 cmd->sense_info) < 0); 3530} 3531 3532int 3533transport_send_check_condition_and_sense(struct se_cmd *cmd, 3534 sense_reason_t reason, int from_transport) 3535{ 3536 unsigned long flags; 3537 3538 WARN_ON_ONCE(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB); 3539 3540 spin_lock_irqsave(&cmd->t_state_lock, flags); 3541 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 3542 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 3543 return 0; 3544 } 3545 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; 3546 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 3547 3548 if (!from_transport) 3549 translate_sense_reason(cmd, reason); 3550 3551 trace_target_cmd_complete(cmd); 3552 return cmd->se_tfo->queue_status(cmd); 3553} 3554EXPORT_SYMBOL(transport_send_check_condition_and_sense); 3555 3556/** 3557 * target_send_busy - Send SCSI BUSY status back to the initiator 3558 * @cmd: SCSI command for which to send a BUSY reply. 3559 * 3560 * Note: Only call this function if target_submit_cmd*() failed. 3561 */ 3562int target_send_busy(struct se_cmd *cmd) 3563{ 3564 WARN_ON_ONCE(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB); 3565 3566 cmd->scsi_status = SAM_STAT_BUSY; 3567 trace_target_cmd_complete(cmd); 3568 return cmd->se_tfo->queue_status(cmd); 3569} 3570EXPORT_SYMBOL(target_send_busy); 3571 3572static void target_tmr_work(struct work_struct *work) 3573{ 3574 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 3575 struct se_device *dev = cmd->se_dev; 3576 struct se_tmr_req *tmr = cmd->se_tmr_req; 3577 int ret; 3578 3579 if (cmd->transport_state & CMD_T_ABORTED) 3580 goto aborted; 3581 3582 switch (tmr->function) { 3583 case TMR_ABORT_TASK: 3584 core_tmr_abort_task(dev, tmr, cmd->se_sess); 3585 break; 3586 case TMR_ABORT_TASK_SET: 3587 case TMR_CLEAR_ACA: 3588 case TMR_CLEAR_TASK_SET: 3589 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; 3590 break; 3591 case TMR_LUN_RESET: 3592 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); 3593 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : 3594 TMR_FUNCTION_REJECTED; 3595 if (tmr->response == TMR_FUNCTION_COMPLETE) { 3596 target_dev_ua_allocate(dev, 0x29, 3597 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED); 3598 } 3599 break; 3600 case TMR_TARGET_WARM_RESET: 3601 tmr->response = TMR_FUNCTION_REJECTED; 3602 break; 3603 case TMR_TARGET_COLD_RESET: 3604 tmr->response = TMR_FUNCTION_REJECTED; 3605 break; 3606 default: 3607 pr_err("Unknown TMR function: 0x%02x.\n", 3608 tmr->function); 3609 tmr->response = TMR_FUNCTION_REJECTED; 3610 break; 3611 } 3612 3613 if (cmd->transport_state & CMD_T_ABORTED) 3614 goto aborted; 3615 3616 cmd->se_tfo->queue_tm_rsp(cmd); 3617 3618 transport_lun_remove_cmd(cmd); 3619 transport_cmd_check_stop_to_fabric(cmd); 3620 return; 3621 3622aborted: 3623 target_handle_abort(cmd); 3624} 3625 3626int transport_generic_handle_tmr( 3627 struct se_cmd *cmd) 3628{ 3629 unsigned long flags; 3630 bool aborted = false; 3631 3632 spin_lock_irqsave(&cmd->se_dev->se_tmr_lock, flags); 3633 list_add_tail(&cmd->se_tmr_req->tmr_list, &cmd->se_dev->dev_tmr_list); 3634 spin_unlock_irqrestore(&cmd->se_dev->se_tmr_lock, flags); 3635 3636 spin_lock_irqsave(&cmd->t_state_lock, flags); 3637 if (cmd->transport_state & CMD_T_ABORTED) { 3638 aborted = true; 3639 } else { 3640 cmd->t_state = TRANSPORT_ISTATE_PROCESSING; 3641 cmd->transport_state |= CMD_T_ACTIVE; 3642 } 3643 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 3644 3645 if (aborted) { 3646 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d ref_tag: %llu tag: %llu\n", 3647 cmd->se_tmr_req->function, 3648 cmd->se_tmr_req->ref_task_tag, cmd->tag); 3649 target_handle_abort(cmd); 3650 return 0; 3651 } 3652 3653 INIT_WORK(&cmd->work, target_tmr_work); 3654 schedule_work(&cmd->work); 3655 return 0; 3656} 3657EXPORT_SYMBOL(transport_generic_handle_tmr); 3658 3659bool 3660target_check_wce(struct se_device *dev) 3661{ 3662 bool wce = false; 3663 3664 if (dev->transport->get_write_cache) 3665 wce = dev->transport->get_write_cache(dev); 3666 else if (dev->dev_attrib.emulate_write_cache > 0) 3667 wce = true; 3668 3669 return wce; 3670} 3671 3672bool 3673target_check_fua(struct se_device *dev) 3674{ 3675 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0; 3676} 3677