1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
38 #include <linux/cdrom.h>
39 #include <asm/unaligned.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_tcq.h>
46 #include <target/target_core_base.h>
47 #include <target/target_core_device.h>
48 #include <target/target_core_tmr.h>
49 #include <target/target_core_tpg.h>
50 #include <target/target_core_transport.h>
51 #include <target/target_core_fabric_ops.h>
52 #include <target/target_core_configfs.h>
54 #include "target_core_alua.h"
55 #include "target_core_hba.h"
56 #include "target_core_pr.h"
57 #include "target_core_ua.h"
59 static int sub_api_initialized;
61 static struct kmem_cache *se_cmd_cache;
62 static struct kmem_cache *se_sess_cache;
63 struct kmem_cache *se_tmr_req_cache;
64 struct kmem_cache *se_ua_cache;
65 struct kmem_cache *t10_pr_reg_cache;
66 struct kmem_cache *t10_alua_lu_gp_cache;
67 struct kmem_cache *t10_alua_lu_gp_mem_cache;
68 struct kmem_cache *t10_alua_tg_pt_gp_cache;
69 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71 static int transport_generic_write_pending(struct se_cmd *);
72 static int transport_processing_thread(void *param);
73 static int __transport_execute_tasks(struct se_device *dev);
74 static void transport_complete_task_attr(struct se_cmd *cmd);
75 static void transport_handle_queue_full(struct se_cmd *cmd,
76 struct se_device *dev);
77 static void transport_direct_request_timeout(struct se_cmd *cmd);
78 static void transport_free_dev_tasks(struct se_cmd *cmd);
79 static u32 transport_allocate_tasks(struct se_cmd *cmd,
80 unsigned long long starting_lba,
81 enum dma_data_direction data_direction,
82 struct scatterlist *sgl, unsigned int nents);
83 static int transport_generic_get_mem(struct se_cmd *cmd);
84 static void transport_put_cmd(struct se_cmd *cmd);
85 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
86 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
88 int init_se_kmem_caches(void)
90 se_cmd_cache = kmem_cache_create("se_cmd_cache",
91 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
93 pr_err("kmem_cache_create for struct se_cmd failed\n");
96 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
97 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
99 if (!se_tmr_req_cache) {
100 pr_err("kmem_cache_create() for struct se_tmr_req"
104 se_sess_cache = kmem_cache_create("se_sess_cache",
105 sizeof(struct se_session), __alignof__(struct se_session),
107 if (!se_sess_cache) {
108 pr_err("kmem_cache_create() for struct se_session"
112 se_ua_cache = kmem_cache_create("se_ua_cache",
113 sizeof(struct se_ua), __alignof__(struct se_ua),
116 pr_err("kmem_cache_create() for struct se_ua failed\n");
119 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
120 sizeof(struct t10_pr_registration),
121 __alignof__(struct t10_pr_registration), 0, NULL);
122 if (!t10_pr_reg_cache) {
123 pr_err("kmem_cache_create() for struct t10_pr_registration"
127 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
128 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
130 if (!t10_alua_lu_gp_cache) {
131 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
135 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
136 sizeof(struct t10_alua_lu_gp_member),
137 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
138 if (!t10_alua_lu_gp_mem_cache) {
139 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
143 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
144 sizeof(struct t10_alua_tg_pt_gp),
145 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
146 if (!t10_alua_tg_pt_gp_cache) {
147 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
151 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
152 "t10_alua_tg_pt_gp_mem_cache",
153 sizeof(struct t10_alua_tg_pt_gp_member),
154 __alignof__(struct t10_alua_tg_pt_gp_member),
156 if (!t10_alua_tg_pt_gp_mem_cache) {
157 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
165 kmem_cache_destroy(se_cmd_cache);
166 if (se_tmr_req_cache)
167 kmem_cache_destroy(se_tmr_req_cache);
169 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
172 if (t10_pr_reg_cache)
173 kmem_cache_destroy(t10_pr_reg_cache);
174 if (t10_alua_lu_gp_cache)
175 kmem_cache_destroy(t10_alua_lu_gp_cache);
176 if (t10_alua_lu_gp_mem_cache)
177 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
178 if (t10_alua_tg_pt_gp_cache)
179 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
180 if (t10_alua_tg_pt_gp_mem_cache)
181 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
185 void release_se_kmem_caches(void)
187 kmem_cache_destroy(se_cmd_cache);
188 kmem_cache_destroy(se_tmr_req_cache);
189 kmem_cache_destroy(se_sess_cache);
190 kmem_cache_destroy(se_ua_cache);
191 kmem_cache_destroy(t10_pr_reg_cache);
192 kmem_cache_destroy(t10_alua_lu_gp_cache);
193 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
194 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
195 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
198 /* This code ensures unique mib indexes are handed out. */
199 static DEFINE_SPINLOCK(scsi_mib_index_lock);
200 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
203 * Allocate a new row index for the entry type specified
205 u32 scsi_get_new_index(scsi_index_t type)
209 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
211 spin_lock(&scsi_mib_index_lock);
212 new_index = ++scsi_mib_index[type];
213 spin_unlock(&scsi_mib_index_lock);
218 void transport_init_queue_obj(struct se_queue_obj *qobj)
220 atomic_set(&qobj->queue_cnt, 0);
221 INIT_LIST_HEAD(&qobj->qobj_list);
222 init_waitqueue_head(&qobj->thread_wq);
223 spin_lock_init(&qobj->cmd_queue_lock);
225 EXPORT_SYMBOL(transport_init_queue_obj);
227 static int transport_subsystem_reqmods(void)
231 ret = request_module("target_core_iblock");
233 pr_err("Unable to load target_core_iblock\n");
235 ret = request_module("target_core_file");
237 pr_err("Unable to load target_core_file\n");
239 ret = request_module("target_core_pscsi");
241 pr_err("Unable to load target_core_pscsi\n");
243 ret = request_module("target_core_stgt");
245 pr_err("Unable to load target_core_stgt\n");
250 int transport_subsystem_check_init(void)
254 if (sub_api_initialized)
257 * Request the loading of known TCM subsystem plugins..
259 ret = transport_subsystem_reqmods();
263 sub_api_initialized = 1;
267 struct se_session *transport_init_session(void)
269 struct se_session *se_sess;
271 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
273 pr_err("Unable to allocate struct se_session from"
275 return ERR_PTR(-ENOMEM);
277 INIT_LIST_HEAD(&se_sess->sess_list);
278 INIT_LIST_HEAD(&se_sess->sess_acl_list);
282 EXPORT_SYMBOL(transport_init_session);
285 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
287 void __transport_register_session(
288 struct se_portal_group *se_tpg,
289 struct se_node_acl *se_nacl,
290 struct se_session *se_sess,
291 void *fabric_sess_ptr)
293 unsigned char buf[PR_REG_ISID_LEN];
295 se_sess->se_tpg = se_tpg;
296 se_sess->fabric_sess_ptr = fabric_sess_ptr;
298 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
300 * Only set for struct se_session's that will actually be moving I/O.
301 * eg: *NOT* discovery sessions.
305 * If the fabric module supports an ISID based TransportID,
306 * save this value in binary from the fabric I_T Nexus now.
308 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
309 memset(&buf[0], 0, PR_REG_ISID_LEN);
310 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
311 &buf[0], PR_REG_ISID_LEN);
312 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
314 spin_lock_irq(&se_nacl->nacl_sess_lock);
316 * The se_nacl->nacl_sess pointer will be set to the
317 * last active I_T Nexus for each struct se_node_acl.
319 se_nacl->nacl_sess = se_sess;
321 list_add_tail(&se_sess->sess_acl_list,
322 &se_nacl->acl_sess_list);
323 spin_unlock_irq(&se_nacl->nacl_sess_lock);
325 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
327 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
328 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
330 EXPORT_SYMBOL(__transport_register_session);
332 void transport_register_session(
333 struct se_portal_group *se_tpg,
334 struct se_node_acl *se_nacl,
335 struct se_session *se_sess,
336 void *fabric_sess_ptr)
338 spin_lock_bh(&se_tpg->session_lock);
339 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
340 spin_unlock_bh(&se_tpg->session_lock);
342 EXPORT_SYMBOL(transport_register_session);
344 void transport_deregister_session_configfs(struct se_session *se_sess)
346 struct se_node_acl *se_nacl;
349 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
351 se_nacl = se_sess->se_node_acl;
353 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
354 list_del(&se_sess->sess_acl_list);
356 * If the session list is empty, then clear the pointer.
357 * Otherwise, set the struct se_session pointer from the tail
358 * element of the per struct se_node_acl active session list.
360 if (list_empty(&se_nacl->acl_sess_list))
361 se_nacl->nacl_sess = NULL;
363 se_nacl->nacl_sess = container_of(
364 se_nacl->acl_sess_list.prev,
365 struct se_session, sess_acl_list);
367 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
370 EXPORT_SYMBOL(transport_deregister_session_configfs);
372 void transport_free_session(struct se_session *se_sess)
374 kmem_cache_free(se_sess_cache, se_sess);
376 EXPORT_SYMBOL(transport_free_session);
378 void transport_deregister_session(struct se_session *se_sess)
380 struct se_portal_group *se_tpg = se_sess->se_tpg;
381 struct se_node_acl *se_nacl;
385 transport_free_session(se_sess);
389 spin_lock_irqsave(&se_tpg->session_lock, flags);
390 list_del(&se_sess->sess_list);
391 se_sess->se_tpg = NULL;
392 se_sess->fabric_sess_ptr = NULL;
393 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
396 * Determine if we need to do extra work for this initiator node's
397 * struct se_node_acl if it had been previously dynamically generated.
399 se_nacl = se_sess->se_node_acl;
401 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
402 if (se_nacl->dynamic_node_acl) {
403 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
405 list_del(&se_nacl->acl_list);
406 se_tpg->num_node_acls--;
407 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
409 core_tpg_wait_for_nacl_pr_ref(se_nacl);
410 core_free_device_list_for_node(se_nacl, se_tpg);
411 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
413 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
416 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
419 transport_free_session(se_sess);
421 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
422 se_tpg->se_tpg_tfo->get_fabric_name());
424 EXPORT_SYMBOL(transport_deregister_session);
427 * Called with cmd->t_state_lock held.
429 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
431 struct se_device *dev = cmd->se_dev;
432 struct se_task *task;
438 list_for_each_entry(task, &cmd->t_task_list, t_list) {
439 if (task->task_flags & TF_ACTIVE)
442 if (!atomic_read(&task->task_state_active))
445 spin_lock_irqsave(&dev->execute_task_lock, flags);
446 list_del(&task->t_state_list);
447 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
448 cmd->se_tfo->get_task_tag(cmd), dev, task);
449 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
451 atomic_set(&task->task_state_active, 0);
452 atomic_dec(&cmd->t_task_cdbs_ex_left);
456 /* transport_cmd_check_stop():
458 * 'transport_off = 1' determines if t_transport_active should be cleared.
459 * 'transport_off = 2' determines if task_dev_state should be removed.
461 * A non-zero u8 t_state sets cmd->t_state.
462 * Returns 1 when command is stopped, else 0.
464 static int transport_cmd_check_stop(
471 spin_lock_irqsave(&cmd->t_state_lock, flags);
473 * Determine if IOCTL context caller in requesting the stopping of this
474 * command for LUN shutdown purposes.
476 if (atomic_read(&cmd->transport_lun_stop)) {
477 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
478 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
479 cmd->se_tfo->get_task_tag(cmd));
481 cmd->deferred_t_state = cmd->t_state;
482 cmd->t_state = TRANSPORT_DEFERRED_CMD;
483 atomic_set(&cmd->t_transport_active, 0);
484 if (transport_off == 2)
485 transport_all_task_dev_remove_state(cmd);
486 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
488 complete(&cmd->transport_lun_stop_comp);
492 * Determine if frontend context caller is requesting the stopping of
493 * this command for frontend exceptions.
495 if (atomic_read(&cmd->t_transport_stop)) {
496 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
497 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
498 cmd->se_tfo->get_task_tag(cmd));
500 cmd->deferred_t_state = cmd->t_state;
501 cmd->t_state = TRANSPORT_DEFERRED_CMD;
502 if (transport_off == 2)
503 transport_all_task_dev_remove_state(cmd);
506 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
509 if (transport_off == 2)
511 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
513 complete(&cmd->t_transport_stop_comp);
517 atomic_set(&cmd->t_transport_active, 0);
518 if (transport_off == 2) {
519 transport_all_task_dev_remove_state(cmd);
521 * Clear struct se_cmd->se_lun before the transport_off == 2
522 * handoff to fabric module.
526 * Some fabric modules like tcm_loop can release
527 * their internally allocated I/O reference now and
530 if (cmd->se_tfo->check_stop_free != NULL) {
531 spin_unlock_irqrestore(
532 &cmd->t_state_lock, flags);
534 cmd->se_tfo->check_stop_free(cmd);
538 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
542 cmd->t_state = t_state;
543 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
548 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
550 return transport_cmd_check_stop(cmd, 2, 0);
553 static void transport_lun_remove_cmd(struct se_cmd *cmd)
555 struct se_lun *lun = cmd->se_lun;
561 spin_lock_irqsave(&cmd->t_state_lock, flags);
562 if (!atomic_read(&cmd->transport_dev_active)) {
563 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
566 atomic_set(&cmd->transport_dev_active, 0);
567 transport_all_task_dev_remove_state(cmd);
568 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
572 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
573 if (atomic_read(&cmd->transport_lun_active)) {
574 list_del(&cmd->se_lun_node);
575 atomic_set(&cmd->transport_lun_active, 0);
577 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
578 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
581 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
584 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
586 if (!cmd->se_tmr_req)
587 transport_lun_remove_cmd(cmd);
589 if (transport_cmd_check_stop_to_fabric(cmd))
592 transport_remove_cmd_from_queue(cmd);
593 transport_put_cmd(cmd);
597 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
600 struct se_device *dev = cmd->se_dev;
601 struct se_queue_obj *qobj = &dev->dev_queue_obj;
605 spin_lock_irqsave(&cmd->t_state_lock, flags);
606 cmd->t_state = t_state;
607 atomic_set(&cmd->t_transport_active, 1);
608 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
611 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
613 /* If the cmd is already on the list, remove it before we add it */
614 if (!list_empty(&cmd->se_queue_node))
615 list_del(&cmd->se_queue_node);
617 atomic_inc(&qobj->queue_cnt);
620 list_add(&cmd->se_queue_node, &qobj->qobj_list);
622 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
623 atomic_set(&cmd->t_transport_queue_active, 1);
624 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
626 wake_up_interruptible(&qobj->thread_wq);
629 static struct se_cmd *
630 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
635 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
636 if (list_empty(&qobj->qobj_list)) {
637 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
642 atomic_set(&cmd->t_transport_queue_active, 0);
644 list_del_init(&cmd->se_queue_node);
645 atomic_dec(&qobj->queue_cnt);
646 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
651 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
653 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
656 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
657 if (!atomic_read(&cmd->t_transport_queue_active)) {
658 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
661 atomic_set(&cmd->t_transport_queue_active, 0);
662 atomic_dec(&qobj->queue_cnt);
663 list_del_init(&cmd->se_queue_node);
664 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
666 if (atomic_read(&cmd->t_transport_queue_active)) {
667 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
668 cmd->se_tfo->get_task_tag(cmd),
669 atomic_read(&cmd->t_transport_queue_active));
674 * Completion function used by TCM subsystem plugins (such as FILEIO)
675 * for queueing up response from struct se_subsystem_api->do_task()
677 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
679 struct se_task *task = list_entry(cmd->t_task_list.next,
680 struct se_task, t_list);
683 cmd->scsi_status = SAM_STAT_GOOD;
684 task->task_scsi_status = GOOD;
686 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
687 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
688 task->task_se_cmd->transport_error_status =
689 PYX_TRANSPORT_ILLEGAL_REQUEST;
692 transport_complete_task(task, good);
694 EXPORT_SYMBOL(transport_complete_sync_cache);
696 /* transport_complete_task():
698 * Called from interrupt and non interrupt context depending
699 * on the transport plugin.
701 void transport_complete_task(struct se_task *task, int success)
703 struct se_cmd *cmd = task->task_se_cmd;
704 struct se_device *dev = cmd->se_dev;
708 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
709 cmd->t_task_cdb[0], dev);
712 atomic_inc(&dev->depth_left);
714 del_timer(&task->task_timer);
716 spin_lock_irqsave(&cmd->t_state_lock, flags);
717 task->task_flags &= ~TF_ACTIVE;
720 * See if any sense data exists, if so set the TASK_SENSE flag.
721 * Also check for any other post completion work that needs to be
722 * done by the plugins.
724 if (dev && dev->transport->transport_complete) {
725 if (dev->transport->transport_complete(task) != 0) {
726 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
727 task->task_sense = 1;
733 * See if we are waiting for outstanding struct se_task
734 * to complete for an exception condition
736 if (task->task_flags & TF_REQUEST_STOP) {
738 * Decrement cmd->t_se_count if this task had
739 * previously thrown its timeout exception handler.
741 if (task->task_flags & TF_TIMEOUT) {
742 atomic_dec(&cmd->t_se_count);
743 task->task_flags &= ~TF_TIMEOUT;
745 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
747 complete(&task->task_stop_comp);
751 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
752 * left counter to determine when the struct se_cmd is ready to be queued to
753 * the processing thread.
755 if (task->task_flags & TF_TIMEOUT) {
756 if (!atomic_dec_and_test(
757 &cmd->t_task_cdbs_timeout_left)) {
758 spin_unlock_irqrestore(&cmd->t_state_lock,
762 t_state = TRANSPORT_COMPLETE_TIMEOUT;
763 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
765 transport_add_cmd_to_queue(cmd, t_state, false);
768 atomic_dec(&cmd->t_task_cdbs_timeout_left);
771 * Decrement the outstanding t_task_cdbs_left count. The last
772 * struct se_task from struct se_cmd will complete itself into the
773 * device queue depending upon int success.
775 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
777 cmd->t_tasks_failed = 1;
779 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
783 if (!success || cmd->t_tasks_failed) {
784 t_state = TRANSPORT_COMPLETE_FAILURE;
785 if (!task->task_error_status) {
786 task->task_error_status =
787 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
788 cmd->transport_error_status =
789 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
792 atomic_set(&cmd->t_transport_complete, 1);
793 t_state = TRANSPORT_COMPLETE_OK;
795 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
797 transport_add_cmd_to_queue(cmd, t_state, false);
799 EXPORT_SYMBOL(transport_complete_task);
802 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
803 * struct se_task list are ready to be added to the active execution list
806 * Called with se_dev_t->execute_task_lock called.
808 static inline int transport_add_task_check_sam_attr(
809 struct se_task *task,
810 struct se_task *task_prev,
811 struct se_device *dev)
814 * No SAM Task attribute emulation enabled, add to tail of
817 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
818 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
822 * HEAD_OF_QUEUE attribute for received CDB, which means
823 * the first task that is associated with a struct se_cmd goes to
824 * head of the struct se_device->execute_task_list, and task_prev
825 * after that for each subsequent task
827 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
828 list_add(&task->t_execute_list,
829 (task_prev != NULL) ?
830 &task_prev->t_execute_list :
831 &dev->execute_task_list);
833 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
834 " in execution queue\n",
835 task->task_se_cmd->t_task_cdb[0]);
839 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
840 * transitioned from Dermant -> Active state, and are added to the end
841 * of the struct se_device->execute_task_list
843 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
847 /* __transport_add_task_to_execute_queue():
849 * Called with se_dev_t->execute_task_lock called.
851 static void __transport_add_task_to_execute_queue(
852 struct se_task *task,
853 struct se_task *task_prev,
854 struct se_device *dev)
858 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
859 atomic_inc(&dev->execute_tasks);
861 if (atomic_read(&task->task_state_active))
864 * Determine if this task needs to go to HEAD_OF_QUEUE for the
865 * state list as well. Running with SAM Task Attribute emulation
866 * will always return head_of_queue == 0 here
869 list_add(&task->t_state_list, (task_prev) ?
870 &task_prev->t_state_list :
871 &dev->state_task_list);
873 list_add_tail(&task->t_state_list, &dev->state_task_list);
875 atomic_set(&task->task_state_active, 1);
877 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
878 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
882 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
884 struct se_device *dev = cmd->se_dev;
885 struct se_task *task;
888 spin_lock_irqsave(&cmd->t_state_lock, flags);
889 list_for_each_entry(task, &cmd->t_task_list, t_list) {
890 if (atomic_read(&task->task_state_active))
893 spin_lock(&dev->execute_task_lock);
894 list_add_tail(&task->t_state_list, &dev->state_task_list);
895 atomic_set(&task->task_state_active, 1);
897 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
898 task->task_se_cmd->se_tfo->get_task_tag(
899 task->task_se_cmd), task, dev);
901 spin_unlock(&dev->execute_task_lock);
903 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
906 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
908 struct se_device *dev = cmd->se_dev;
909 struct se_task *task, *task_prev = NULL;
912 spin_lock_irqsave(&dev->execute_task_lock, flags);
913 list_for_each_entry(task, &cmd->t_task_list, t_list) {
914 if (!list_empty(&task->t_execute_list))
917 * __transport_add_task_to_execute_queue() handles the
918 * SAM Task Attribute emulation if enabled
920 __transport_add_task_to_execute_queue(task, task_prev, dev);
923 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
926 void __transport_remove_task_from_execute_queue(struct se_task *task,
927 struct se_device *dev)
929 list_del_init(&task->t_execute_list);
930 atomic_dec(&dev->execute_tasks);
933 void transport_remove_task_from_execute_queue(
934 struct se_task *task,
935 struct se_device *dev)
939 if (WARN_ON(list_empty(&task->t_execute_list)))
942 spin_lock_irqsave(&dev->execute_task_lock, flags);
943 __transport_remove_task_from_execute_queue(task, dev);
944 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
948 * Handle QUEUE_FULL / -EAGAIN status
951 static void target_qf_do_work(struct work_struct *work)
953 struct se_device *dev = container_of(work, struct se_device,
955 LIST_HEAD(qf_cmd_list);
956 struct se_cmd *cmd, *cmd_tmp;
958 spin_lock_irq(&dev->qf_cmd_lock);
959 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
960 spin_unlock_irq(&dev->qf_cmd_lock);
962 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
963 list_del(&cmd->se_qf_node);
964 atomic_dec(&dev->dev_qf_count);
965 smp_mb__after_atomic_dec();
967 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
968 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
969 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
970 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
973 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
977 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
979 switch (cmd->data_direction) {
982 case DMA_FROM_DEVICE:
986 case DMA_BIDIRECTIONAL:
995 void transport_dump_dev_state(
996 struct se_device *dev,
1000 *bl += sprintf(b + *bl, "Status: ");
1001 switch (dev->dev_status) {
1002 case TRANSPORT_DEVICE_ACTIVATED:
1003 *bl += sprintf(b + *bl, "ACTIVATED");
1005 case TRANSPORT_DEVICE_DEACTIVATED:
1006 *bl += sprintf(b + *bl, "DEACTIVATED");
1008 case TRANSPORT_DEVICE_SHUTDOWN:
1009 *bl += sprintf(b + *bl, "SHUTDOWN");
1011 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1012 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1013 *bl += sprintf(b + *bl, "OFFLINE");
1016 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1020 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1021 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1023 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
1024 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1025 *bl += sprintf(b + *bl, " ");
1028 void transport_dump_vpd_proto_id(
1029 struct t10_vpd *vpd,
1030 unsigned char *p_buf,
1033 unsigned char buf[VPD_TMP_BUF_SIZE];
1036 memset(buf, 0, VPD_TMP_BUF_SIZE);
1037 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1039 switch (vpd->protocol_identifier) {
1041 sprintf(buf+len, "Fibre Channel\n");
1044 sprintf(buf+len, "Parallel SCSI\n");
1047 sprintf(buf+len, "SSA\n");
1050 sprintf(buf+len, "IEEE 1394\n");
1053 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1057 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1060 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1063 sprintf(buf+len, "Automation/Drive Interface Transport"
1067 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1070 sprintf(buf+len, "Unknown 0x%02x\n",
1071 vpd->protocol_identifier);
1076 strncpy(p_buf, buf, p_buf_len);
1078 pr_debug("%s", buf);
1082 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1085 * Check if the Protocol Identifier Valid (PIV) bit is set..
1087 * from spc3r23.pdf section 7.5.1
1089 if (page_83[1] & 0x80) {
1090 vpd->protocol_identifier = (page_83[0] & 0xf0);
1091 vpd->protocol_identifier_set = 1;
1092 transport_dump_vpd_proto_id(vpd, NULL, 0);
1095 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1097 int transport_dump_vpd_assoc(
1098 struct t10_vpd *vpd,
1099 unsigned char *p_buf,
1102 unsigned char buf[VPD_TMP_BUF_SIZE];
1106 memset(buf, 0, VPD_TMP_BUF_SIZE);
1107 len = sprintf(buf, "T10 VPD Identifier Association: ");
1109 switch (vpd->association) {
1111 sprintf(buf+len, "addressed logical unit\n");
1114 sprintf(buf+len, "target port\n");
1117 sprintf(buf+len, "SCSI target device\n");
1120 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1126 strncpy(p_buf, buf, p_buf_len);
1128 pr_debug("%s", buf);
1133 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1136 * The VPD identification association..
1138 * from spc3r23.pdf Section 7.6.3.1 Table 297
1140 vpd->association = (page_83[1] & 0x30);
1141 return transport_dump_vpd_assoc(vpd, NULL, 0);
1143 EXPORT_SYMBOL(transport_set_vpd_assoc);
1145 int transport_dump_vpd_ident_type(
1146 struct t10_vpd *vpd,
1147 unsigned char *p_buf,
1150 unsigned char buf[VPD_TMP_BUF_SIZE];
1154 memset(buf, 0, VPD_TMP_BUF_SIZE);
1155 len = sprintf(buf, "T10 VPD Identifier Type: ");
1157 switch (vpd->device_identifier_type) {
1159 sprintf(buf+len, "Vendor specific\n");
1162 sprintf(buf+len, "T10 Vendor ID based\n");
1165 sprintf(buf+len, "EUI-64 based\n");
1168 sprintf(buf+len, "NAA\n");
1171 sprintf(buf+len, "Relative target port identifier\n");
1174 sprintf(buf+len, "SCSI name string\n");
1177 sprintf(buf+len, "Unsupported: 0x%02x\n",
1178 vpd->device_identifier_type);
1184 if (p_buf_len < strlen(buf)+1)
1186 strncpy(p_buf, buf, p_buf_len);
1188 pr_debug("%s", buf);
1194 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1197 * The VPD identifier type..
1199 * from spc3r23.pdf Section 7.6.3.1 Table 298
1201 vpd->device_identifier_type = (page_83[1] & 0x0f);
1202 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1204 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1206 int transport_dump_vpd_ident(
1207 struct t10_vpd *vpd,
1208 unsigned char *p_buf,
1211 unsigned char buf[VPD_TMP_BUF_SIZE];
1214 memset(buf, 0, VPD_TMP_BUF_SIZE);
1216 switch (vpd->device_identifier_code_set) {
1217 case 0x01: /* Binary */
1218 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1219 &vpd->device_identifier[0]);
1221 case 0x02: /* ASCII */
1222 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1223 &vpd->device_identifier[0]);
1225 case 0x03: /* UTF-8 */
1226 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1227 &vpd->device_identifier[0]);
1230 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1231 " 0x%02x", vpd->device_identifier_code_set);
1237 strncpy(p_buf, buf, p_buf_len);
1239 pr_debug("%s", buf);
1245 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1247 static const char hex_str[] = "0123456789abcdef";
1248 int j = 0, i = 4; /* offset to start of the identifer */
1251 * The VPD Code Set (encoding)
1253 * from spc3r23.pdf Section 7.6.3.1 Table 296
1255 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1256 switch (vpd->device_identifier_code_set) {
1257 case 0x01: /* Binary */
1258 vpd->device_identifier[j++] =
1259 hex_str[vpd->device_identifier_type];
1260 while (i < (4 + page_83[3])) {
1261 vpd->device_identifier[j++] =
1262 hex_str[(page_83[i] & 0xf0) >> 4];
1263 vpd->device_identifier[j++] =
1264 hex_str[page_83[i] & 0x0f];
1268 case 0x02: /* ASCII */
1269 case 0x03: /* UTF-8 */
1270 while (i < (4 + page_83[3]))
1271 vpd->device_identifier[j++] = page_83[i++];
1277 return transport_dump_vpd_ident(vpd, NULL, 0);
1279 EXPORT_SYMBOL(transport_set_vpd_ident);
1281 static void core_setup_task_attr_emulation(struct se_device *dev)
1284 * If this device is from Target_Core_Mod/pSCSI, disable the
1285 * SAM Task Attribute emulation.
1287 * This is currently not available in upsream Linux/SCSI Target
1288 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1290 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1291 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1295 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1296 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1297 " device\n", dev->transport->name,
1298 dev->transport->get_device_rev(dev));
1301 static void scsi_dump_inquiry(struct se_device *dev)
1303 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1306 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1308 pr_debug(" Vendor: ");
1309 for (i = 0; i < 8; i++)
1310 if (wwn->vendor[i] >= 0x20)
1311 pr_debug("%c", wwn->vendor[i]);
1315 pr_debug(" Model: ");
1316 for (i = 0; i < 16; i++)
1317 if (wwn->model[i] >= 0x20)
1318 pr_debug("%c", wwn->model[i]);
1322 pr_debug(" Revision: ");
1323 for (i = 0; i < 4; i++)
1324 if (wwn->revision[i] >= 0x20)
1325 pr_debug("%c", wwn->revision[i]);
1331 device_type = dev->transport->get_device_type(dev);
1332 pr_debug(" Type: %s ", scsi_device_type(device_type));
1333 pr_debug(" ANSI SCSI revision: %02x\n",
1334 dev->transport->get_device_rev(dev));
1337 struct se_device *transport_add_device_to_core_hba(
1339 struct se_subsystem_api *transport,
1340 struct se_subsystem_dev *se_dev,
1342 void *transport_dev,
1343 struct se_dev_limits *dev_limits,
1344 const char *inquiry_prod,
1345 const char *inquiry_rev)
1348 struct se_device *dev;
1350 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1352 pr_err("Unable to allocate memory for se_dev_t\n");
1356 transport_init_queue_obj(&dev->dev_queue_obj);
1357 dev->dev_flags = device_flags;
1358 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1359 dev->dev_ptr = transport_dev;
1361 dev->se_sub_dev = se_dev;
1362 dev->transport = transport;
1363 atomic_set(&dev->active_cmds, 0);
1364 INIT_LIST_HEAD(&dev->dev_list);
1365 INIT_LIST_HEAD(&dev->dev_sep_list);
1366 INIT_LIST_HEAD(&dev->dev_tmr_list);
1367 INIT_LIST_HEAD(&dev->execute_task_list);
1368 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1369 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1370 INIT_LIST_HEAD(&dev->state_task_list);
1371 INIT_LIST_HEAD(&dev->qf_cmd_list);
1372 spin_lock_init(&dev->execute_task_lock);
1373 spin_lock_init(&dev->delayed_cmd_lock);
1374 spin_lock_init(&dev->ordered_cmd_lock);
1375 spin_lock_init(&dev->state_task_lock);
1376 spin_lock_init(&dev->dev_alua_lock);
1377 spin_lock_init(&dev->dev_reservation_lock);
1378 spin_lock_init(&dev->dev_status_lock);
1379 spin_lock_init(&dev->dev_status_thr_lock);
1380 spin_lock_init(&dev->se_port_lock);
1381 spin_lock_init(&dev->se_tmr_lock);
1382 spin_lock_init(&dev->qf_cmd_lock);
1384 dev->queue_depth = dev_limits->queue_depth;
1385 atomic_set(&dev->depth_left, dev->queue_depth);
1386 atomic_set(&dev->dev_ordered_id, 0);
1388 se_dev_set_default_attribs(dev, dev_limits);
1390 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1391 dev->creation_time = get_jiffies_64();
1392 spin_lock_init(&dev->stats_lock);
1394 spin_lock(&hba->device_lock);
1395 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1397 spin_unlock(&hba->device_lock);
1399 * Setup the SAM Task Attribute emulation for struct se_device
1401 core_setup_task_attr_emulation(dev);
1403 * Force PR and ALUA passthrough emulation with internal object use.
1405 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1407 * Setup the Reservations infrastructure for struct se_device
1409 core_setup_reservations(dev, force_pt);
1411 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1413 if (core_setup_alua(dev, force_pt) < 0)
1417 * Startup the struct se_device processing thread
1419 dev->process_thread = kthread_run(transport_processing_thread, dev,
1420 "LIO_%s", dev->transport->name);
1421 if (IS_ERR(dev->process_thread)) {
1422 pr_err("Unable to create kthread: LIO_%s\n",
1423 dev->transport->name);
1427 * Setup work_queue for QUEUE_FULL
1429 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1431 * Preload the initial INQUIRY const values if we are doing
1432 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1433 * passthrough because this is being provided by the backend LLD.
1434 * This is required so that transport_get_inquiry() copies these
1435 * originals once back into DEV_T10_WWN(dev) for the virtual device
1438 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1439 if (!inquiry_prod || !inquiry_rev) {
1440 pr_err("All non TCM/pSCSI plugins require"
1441 " INQUIRY consts\n");
1445 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1446 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1447 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1449 scsi_dump_inquiry(dev);
1453 kthread_stop(dev->process_thread);
1455 spin_lock(&hba->device_lock);
1456 list_del(&dev->dev_list);
1458 spin_unlock(&hba->device_lock);
1460 se_release_vpd_for_dev(dev);
1466 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1468 /* transport_generic_prepare_cdb():
1470 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1471 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1472 * The point of this is since we are mapping iSCSI LUNs to
1473 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1474 * devices and HBAs for a loop.
1476 static inline void transport_generic_prepare_cdb(
1480 case READ_10: /* SBC - RDProtect */
1481 case READ_12: /* SBC - RDProtect */
1482 case READ_16: /* SBC - RDProtect */
1483 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1484 case VERIFY: /* SBC - VRProtect */
1485 case VERIFY_16: /* SBC - VRProtect */
1486 case WRITE_VERIFY: /* SBC - VRProtect */
1487 case WRITE_VERIFY_12: /* SBC - VRProtect */
1490 cdb[1] &= 0x1f; /* clear logical unit number */
1495 static struct se_task *
1496 transport_generic_get_task(struct se_cmd *cmd,
1497 enum dma_data_direction data_direction)
1499 struct se_task *task;
1500 struct se_device *dev = cmd->se_dev;
1502 task = dev->transport->alloc_task(cmd->t_task_cdb);
1504 pr_err("Unable to allocate struct se_task\n");
1508 INIT_LIST_HEAD(&task->t_list);
1509 INIT_LIST_HEAD(&task->t_execute_list);
1510 INIT_LIST_HEAD(&task->t_state_list);
1511 init_timer(&task->task_timer);
1512 init_completion(&task->task_stop_comp);
1513 task->task_se_cmd = cmd;
1514 task->task_data_direction = data_direction;
1519 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1522 * Used by fabric modules containing a local struct se_cmd within their
1523 * fabric dependent per I/O descriptor.
1525 void transport_init_se_cmd(
1527 struct target_core_fabric_ops *tfo,
1528 struct se_session *se_sess,
1532 unsigned char *sense_buffer)
1534 INIT_LIST_HEAD(&cmd->se_lun_node);
1535 INIT_LIST_HEAD(&cmd->se_delayed_node);
1536 INIT_LIST_HEAD(&cmd->se_ordered_node);
1537 INIT_LIST_HEAD(&cmd->se_qf_node);
1538 INIT_LIST_HEAD(&cmd->se_queue_node);
1540 INIT_LIST_HEAD(&cmd->t_task_list);
1541 init_completion(&cmd->transport_lun_fe_stop_comp);
1542 init_completion(&cmd->transport_lun_stop_comp);
1543 init_completion(&cmd->t_transport_stop_comp);
1544 spin_lock_init(&cmd->t_state_lock);
1545 atomic_set(&cmd->transport_dev_active, 1);
1548 cmd->se_sess = se_sess;
1549 cmd->data_length = data_length;
1550 cmd->data_direction = data_direction;
1551 cmd->sam_task_attr = task_attr;
1552 cmd->sense_buffer = sense_buffer;
1554 EXPORT_SYMBOL(transport_init_se_cmd);
1556 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1559 * Check if SAM Task Attribute emulation is enabled for this
1560 * struct se_device storage object
1562 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1565 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1566 pr_debug("SAM Task Attribute ACA"
1567 " emulation is not supported\n");
1571 * Used to determine when ORDERED commands should go from
1572 * Dormant to Active status.
1574 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1575 smp_mb__after_atomic_inc();
1576 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1577 cmd->se_ordered_id, cmd->sam_task_attr,
1578 cmd->se_dev->transport->name);
1582 /* transport_generic_allocate_tasks():
1584 * Called from fabric RX Thread.
1586 int transport_generic_allocate_tasks(
1592 transport_generic_prepare_cdb(cdb);
1594 * Ensure that the received CDB is less than the max (252 + 8) bytes
1595 * for VARIABLE_LENGTH_CMD
1597 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1598 pr_err("Received SCSI CDB with command_size: %d that"
1599 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1600 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1604 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1605 * allocate the additional extended CDB buffer now.. Otherwise
1606 * setup the pointer from __t_task_cdb to t_task_cdb.
1608 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1609 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1611 if (!cmd->t_task_cdb) {
1612 pr_err("Unable to allocate cmd->t_task_cdb"
1613 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1614 scsi_command_size(cdb),
1615 (unsigned long)sizeof(cmd->__t_task_cdb));
1619 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1621 * Copy the original CDB into cmd->
1623 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1625 * Setup the received CDB based on SCSI defined opcodes and
1626 * perform unit attention, persistent reservations and ALUA
1627 * checks for virtual device backends. The cmd->t_task_cdb
1628 * pointer is expected to be setup before we reach this point.
1630 ret = transport_generic_cmd_sequencer(cmd, cdb);
1634 * Check for SAM Task Attribute Emulation
1636 if (transport_check_alloc_task_attr(cmd) < 0) {
1637 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1638 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1641 spin_lock(&cmd->se_lun->lun_sep_lock);
1642 if (cmd->se_lun->lun_sep)
1643 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1644 spin_unlock(&cmd->se_lun->lun_sep_lock);
1647 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1649 static void transport_generic_request_failure(struct se_cmd *,
1650 struct se_device *, int, int);
1652 * Used by fabric module frontends to queue tasks directly.
1653 * Many only be used from process context only
1655 int transport_handle_cdb_direct(
1662 pr_err("cmd->se_lun is NULL\n");
1665 if (in_interrupt()) {
1667 pr_err("transport_generic_handle_cdb cannot be called"
1668 " from interrupt context\n");
1672 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1673 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1674 * in existing usage to ensure that outstanding descriptors are handled
1675 * correctly during shutdown via transport_wait_for_tasks()
1677 * Also, we don't take cmd->t_state_lock here as we only expect
1678 * this to be called for initial descriptor submission.
1680 cmd->t_state = TRANSPORT_NEW_CMD;
1681 atomic_set(&cmd->t_transport_active, 1);
1683 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1684 * so follow TRANSPORT_NEW_CMD processing thread context usage
1685 * and call transport_generic_request_failure() if necessary..
1687 ret = transport_generic_new_cmd(cmd);
1691 cmd->transport_error_status = ret;
1692 transport_generic_request_failure(cmd, NULL, 0,
1693 (cmd->data_direction != DMA_TO_DEVICE));
1697 EXPORT_SYMBOL(transport_handle_cdb_direct);
1700 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1701 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1702 * complete setup in TCM process context w/ TFO->new_cmd_map().
1704 int transport_generic_handle_cdb_map(
1709 pr_err("cmd->se_lun is NULL\n");
1713 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1716 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1718 /* transport_generic_handle_data():
1722 int transport_generic_handle_data(
1726 * For the software fabric case, then we assume the nexus is being
1727 * failed/shutdown when signals are pending from the kthread context
1728 * caller, so we return a failure. For the HW target mode case running
1729 * in interrupt code, the signal_pending() check is skipped.
1731 if (!in_interrupt() && signal_pending(current))
1734 * If the received CDB has aleady been ABORTED by the generic
1735 * target engine, we now call transport_check_aborted_status()
1736 * to queue any delated TASK_ABORTED status for the received CDB to the
1737 * fabric module as we are expecting no further incoming DATA OUT
1738 * sequences at this point.
1740 if (transport_check_aborted_status(cmd, 1) != 0)
1743 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1746 EXPORT_SYMBOL(transport_generic_handle_data);
1748 /* transport_generic_handle_tmr():
1752 int transport_generic_handle_tmr(
1755 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1758 EXPORT_SYMBOL(transport_generic_handle_tmr);
1760 void transport_generic_free_cmd_intr(
1763 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
1765 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1768 * If the task is active, request it to be stopped and sleep until it
1771 bool target_stop_task(struct se_task *task, unsigned long *flags)
1773 struct se_cmd *cmd = task->task_se_cmd;
1774 bool was_active = false;
1776 if (task->task_flags & TF_ACTIVE) {
1777 task->task_flags |= TF_REQUEST_STOP;
1778 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1780 pr_debug("Task %p waiting to complete\n", task);
1781 del_timer_sync(&task->task_timer);
1782 wait_for_completion(&task->task_stop_comp);
1783 pr_debug("Task %p stopped successfully\n", task);
1785 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1786 atomic_dec(&cmd->t_task_cdbs_left);
1787 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1794 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1796 struct se_task *task, *task_tmp;
1797 unsigned long flags;
1800 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1801 cmd->se_tfo->get_task_tag(cmd));
1804 * No tasks remain in the execution queue
1806 spin_lock_irqsave(&cmd->t_state_lock, flags);
1807 list_for_each_entry_safe(task, task_tmp,
1808 &cmd->t_task_list, t_list) {
1809 pr_debug("Processing task %p\n", task);
1811 * If the struct se_task has not been sent and is not active,
1812 * remove the struct se_task from the execution queue.
1814 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1815 spin_unlock_irqrestore(&cmd->t_state_lock,
1817 transport_remove_task_from_execute_queue(task,
1820 pr_debug("Task %p removed from execute queue\n", task);
1821 spin_lock_irqsave(&cmd->t_state_lock, flags);
1825 if (!target_stop_task(task, &flags)) {
1826 pr_debug("Task %p - did nothing\n", task);
1830 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1836 * Handle SAM-esque emulation for generic transport request failures.
1838 static void transport_generic_request_failure(
1840 struct se_device *dev,
1846 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1847 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1848 cmd->t_task_cdb[0]);
1849 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1850 " %d/%d transport_error_status: %d\n",
1851 cmd->se_tfo->get_cmd_state(cmd),
1852 cmd->t_state, cmd->deferred_t_state,
1853 cmd->transport_error_status);
1854 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1855 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1856 " t_transport_active: %d t_transport_stop: %d"
1857 " t_transport_sent: %d\n", cmd->t_task_list_num,
1858 atomic_read(&cmd->t_task_cdbs_left),
1859 atomic_read(&cmd->t_task_cdbs_sent),
1860 atomic_read(&cmd->t_task_cdbs_ex_left),
1861 atomic_read(&cmd->t_transport_active),
1862 atomic_read(&cmd->t_transport_stop),
1863 atomic_read(&cmd->t_transport_sent));
1866 atomic_inc(&dev->depth_left);
1868 * For SAM Task Attribute emulation for failed struct se_cmd
1870 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1871 transport_complete_task_attr(cmd);
1874 transport_direct_request_timeout(cmd);
1875 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1878 switch (cmd->transport_error_status) {
1879 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1880 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1882 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1883 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1885 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1886 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1888 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1889 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1891 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1893 transport_new_cmd_failure(cmd);
1895 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1896 * we force this session to fall back to session
1899 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1900 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1903 case PYX_TRANSPORT_LU_COMM_FAILURE:
1904 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1905 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1907 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1908 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1910 case PYX_TRANSPORT_WRITE_PROTECTED:
1911 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1913 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1915 * No SENSE Data payload for this case, set SCSI Status
1916 * and queue the response to $FABRIC_MOD.
1918 * Uses linux/include/scsi/scsi.h SAM status codes defs
1920 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1922 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1923 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1926 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1929 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1930 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1931 cmd->orig_fe_lun, 0x2C,
1932 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1934 ret = cmd->se_tfo->queue_status(cmd);
1938 case PYX_TRANSPORT_USE_SENSE_REASON:
1940 * struct se_cmd->scsi_sense_reason already set
1944 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1946 cmd->transport_error_status);
1947 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1951 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1952 * make the call to transport_send_check_condition_and_sense()
1953 * directly. Otherwise expect the fabric to make the call to
1954 * transport_send_check_condition_and_sense() after handling
1955 * possible unsoliticied write data payloads.
1957 if (!sc && !cmd->se_tfo->new_cmd_map)
1958 transport_new_cmd_failure(cmd);
1960 ret = transport_send_check_condition_and_sense(cmd,
1961 cmd->scsi_sense_reason, 0);
1967 transport_lun_remove_cmd(cmd);
1968 if (!transport_cmd_check_stop_to_fabric(cmd))
1973 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1974 transport_handle_queue_full(cmd, cmd->se_dev);
1977 static void transport_direct_request_timeout(struct se_cmd *cmd)
1979 unsigned long flags;
1981 spin_lock_irqsave(&cmd->t_state_lock, flags);
1982 if (!atomic_read(&cmd->t_transport_timeout)) {
1983 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1986 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
1987 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1991 atomic_sub(atomic_read(&cmd->t_transport_timeout),
1993 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1996 static void transport_generic_request_timeout(struct se_cmd *cmd)
1998 unsigned long flags;
2001 * Reset cmd->t_se_count to allow transport_put_cmd()
2002 * to allow last call to free memory resources.
2004 spin_lock_irqsave(&cmd->t_state_lock, flags);
2005 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2006 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
2008 atomic_sub(tmp, &cmd->t_se_count);
2010 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2012 transport_put_cmd(cmd);
2015 static inline u32 transport_lba_21(unsigned char *cdb)
2017 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2020 static inline u32 transport_lba_32(unsigned char *cdb)
2022 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2025 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2027 unsigned int __v1, __v2;
2029 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2030 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2032 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2036 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2038 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2040 unsigned int __v1, __v2;
2042 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2043 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2045 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2048 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2050 unsigned long flags;
2052 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2053 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2054 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2058 * Called from interrupt context.
2060 static void transport_task_timeout_handler(unsigned long data)
2062 struct se_task *task = (struct se_task *)data;
2063 struct se_cmd *cmd = task->task_se_cmd;
2064 unsigned long flags;
2066 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2068 spin_lock_irqsave(&cmd->t_state_lock, flags);
2071 * Determine if transport_complete_task() has already been called.
2073 if (!(task->task_flags & TF_ACTIVE)) {
2074 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2076 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2080 atomic_inc(&cmd->t_se_count);
2081 atomic_inc(&cmd->t_transport_timeout);
2082 cmd->t_tasks_failed = 1;
2084 task->task_flags |= TF_TIMEOUT;
2085 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2086 task->task_scsi_status = 1;
2088 if (task->task_flags & TF_REQUEST_STOP) {
2089 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2090 " == 1\n", task, cmd);
2091 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2092 complete(&task->task_stop_comp);
2096 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2097 pr_debug("transport task: %p cmd: %p timeout non zero"
2098 " t_task_cdbs_left\n", task, cmd);
2099 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2102 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2105 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
2106 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2108 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE, false);
2111 static void transport_start_task_timer(struct se_task *task)
2113 struct se_device *dev = task->task_se_cmd->se_dev;
2117 * If the task_timeout is disabled, exit now.
2119 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
2123 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2124 task->task_timer.data = (unsigned long) task;
2125 task->task_timer.function = transport_task_timeout_handler;
2126 add_timer(&task->task_timer);
2129 static inline int transport_tcq_window_closed(struct se_device *dev)
2131 if (dev->dev_tcq_window_closed++ <
2132 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2133 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2135 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2137 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2142 * Called from Fabric Module context from transport_execute_tasks()
2144 * The return of this function determins if the tasks from struct se_cmd
2145 * get added to the execution queue in transport_execute_tasks(),
2146 * or are added to the delayed or ordered lists here.
2148 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2150 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2153 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2154 * to allow the passed struct se_cmd list of tasks to the front of the list.
2156 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2157 atomic_inc(&cmd->se_dev->dev_hoq_count);
2158 smp_mb__after_atomic_inc();
2159 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2160 " 0x%02x, se_ordered_id: %u\n",
2162 cmd->se_ordered_id);
2164 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2165 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2166 list_add_tail(&cmd->se_ordered_node,
2167 &cmd->se_dev->ordered_cmd_list);
2168 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2170 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2171 smp_mb__after_atomic_inc();
2173 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2174 " list, se_ordered_id: %u\n",
2176 cmd->se_ordered_id);
2178 * Add ORDERED command to tail of execution queue if
2179 * no other older commands exist that need to be
2182 if (!atomic_read(&cmd->se_dev->simple_cmds))
2186 * For SIMPLE and UNTAGGED Task Attribute commands
2188 atomic_inc(&cmd->se_dev->simple_cmds);
2189 smp_mb__after_atomic_inc();
2192 * Otherwise if one or more outstanding ORDERED task attribute exist,
2193 * add the dormant task(s) built for the passed struct se_cmd to the
2194 * execution queue and become in Active state for this struct se_device.
2196 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2198 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2199 * will be drained upon completion of HEAD_OF_QUEUE task.
2201 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2202 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2203 list_add_tail(&cmd->se_delayed_node,
2204 &cmd->se_dev->delayed_cmd_list);
2205 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2207 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2208 " delayed CMD list, se_ordered_id: %u\n",
2209 cmd->t_task_cdb[0], cmd->sam_task_attr,
2210 cmd->se_ordered_id);
2212 * Return zero to let transport_execute_tasks() know
2213 * not to add the delayed tasks to the execution list.
2218 * Otherwise, no ORDERED task attributes exist..
2224 * Called from fabric module context in transport_generic_new_cmd() and
2225 * transport_generic_process_write()
2227 static int transport_execute_tasks(struct se_cmd *cmd)
2231 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2232 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2233 transport_generic_request_failure(cmd, NULL, 0, 1);
2238 * Call transport_cmd_check_stop() to see if a fabric exception
2239 * has occurred that prevents execution.
2241 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2243 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2244 * attribute for the tasks of the received struct se_cmd CDB
2246 add_tasks = transport_execute_task_attr(cmd);
2250 * This calls transport_add_tasks_from_cmd() to handle
2251 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2252 * (if enabled) in __transport_add_task_to_execute_queue() and
2253 * transport_add_task_check_sam_attr().
2255 transport_add_tasks_from_cmd(cmd);
2258 * Kick the execution queue for the cmd associated struct se_device
2262 __transport_execute_tasks(cmd->se_dev);
2267 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2268 * from struct se_device->execute_task_list and
2270 * Called from transport_processing_thread()
2272 static int __transport_execute_tasks(struct se_device *dev)
2275 struct se_cmd *cmd = NULL;
2276 struct se_task *task = NULL;
2277 unsigned long flags;
2280 * Check if there is enough room in the device and HBA queue to send
2281 * struct se_tasks to the selected transport.
2284 if (!atomic_read(&dev->depth_left))
2285 return transport_tcq_window_closed(dev);
2287 dev->dev_tcq_window_closed = 0;
2289 spin_lock_irq(&dev->execute_task_lock);
2290 if (list_empty(&dev->execute_task_list)) {
2291 spin_unlock_irq(&dev->execute_task_lock);
2294 task = list_first_entry(&dev->execute_task_list,
2295 struct se_task, t_execute_list);
2296 __transport_remove_task_from_execute_queue(task, dev);
2297 spin_unlock_irq(&dev->execute_task_lock);
2299 atomic_dec(&dev->depth_left);
2301 cmd = task->task_se_cmd;
2303 spin_lock_irqsave(&cmd->t_state_lock, flags);
2304 task->task_flags |= (TF_ACTIVE | TF_SENT);
2305 atomic_inc(&cmd->t_task_cdbs_sent);
2307 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2308 cmd->t_task_list_num)
2309 atomic_set(&cmd->transport_sent, 1);
2311 transport_start_task_timer(task);
2312 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2314 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2315 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2316 * struct se_subsystem_api->do_task() caller below.
2318 if (cmd->transport_emulate_cdb) {
2319 error = cmd->transport_emulate_cdb(cmd);
2321 cmd->transport_error_status = error;
2322 spin_lock_irqsave(&cmd->t_state_lock, flags);
2323 task->task_flags &= ~TF_ACTIVE;
2324 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2325 del_timer_sync(&task->task_timer);
2326 atomic_set(&cmd->transport_sent, 0);
2327 transport_stop_tasks_for_cmd(cmd);
2328 transport_generic_request_failure(cmd, dev, 0, 1);
2332 * Handle the successful completion for transport_emulate_cdb()
2333 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2334 * Otherwise the caller is expected to complete the task with
2337 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2338 cmd->scsi_status = SAM_STAT_GOOD;
2339 task->task_scsi_status = GOOD;
2340 transport_complete_task(task, 1);
2344 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2345 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2346 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2347 * LUN emulation code.
2349 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2350 * call ->do_task() directly and let the underlying TCM subsystem plugin
2351 * code handle the CDB emulation.
2353 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2354 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2355 error = transport_emulate_control_cdb(task);
2357 error = dev->transport->do_task(task);
2360 cmd->transport_error_status = error;
2361 spin_lock_irqsave(&cmd->t_state_lock, flags);
2362 task->task_flags &= ~TF_ACTIVE;
2363 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2364 del_timer_sync(&task->task_timer);
2365 atomic_set(&cmd->transport_sent, 0);
2366 transport_stop_tasks_for_cmd(cmd);
2367 transport_generic_request_failure(cmd, dev, 0, 1);
2376 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2378 unsigned long flags;
2380 * Any unsolicited data will get dumped for failed command inside of
2383 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2384 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2385 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2386 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2389 static inline u32 transport_get_sectors_6(
2394 struct se_device *dev = cmd->se_dev;
2397 * Assume TYPE_DISK for non struct se_device objects.
2398 * Use 8-bit sector value.
2404 * Use 24-bit allocation length for TYPE_TAPE.
2406 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2407 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2410 * Everything else assume TYPE_DISK Sector CDB location.
2411 * Use 8-bit sector value.
2417 static inline u32 transport_get_sectors_10(
2422 struct se_device *dev = cmd->se_dev;
2425 * Assume TYPE_DISK for non struct se_device objects.
2426 * Use 16-bit sector value.
2432 * XXX_10 is not defined in SSC, throw an exception
2434 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2440 * Everything else assume TYPE_DISK Sector CDB location.
2441 * Use 16-bit sector value.
2444 return (u32)(cdb[7] << 8) + cdb[8];
2447 static inline u32 transport_get_sectors_12(
2452 struct se_device *dev = cmd->se_dev;
2455 * Assume TYPE_DISK for non struct se_device objects.
2456 * Use 32-bit sector value.
2462 * XXX_12 is not defined in SSC, throw an exception
2464 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2470 * Everything else assume TYPE_DISK Sector CDB location.
2471 * Use 32-bit sector value.
2474 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2477 static inline u32 transport_get_sectors_16(
2482 struct se_device *dev = cmd->se_dev;
2485 * Assume TYPE_DISK for non struct se_device objects.
2486 * Use 32-bit sector value.
2492 * Use 24-bit allocation length for TYPE_TAPE.
2494 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2495 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2498 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2499 (cdb[12] << 8) + cdb[13];
2503 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2505 static inline u32 transport_get_sectors_32(
2511 * Assume TYPE_DISK for non struct se_device objects.
2512 * Use 32-bit sector value.
2514 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2515 (cdb[30] << 8) + cdb[31];
2519 static inline u32 transport_get_size(
2524 struct se_device *dev = cmd->se_dev;
2526 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2527 if (cdb[1] & 1) { /* sectors */
2528 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2533 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2534 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2535 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2536 dev->transport->name);
2538 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2541 static void transport_xor_callback(struct se_cmd *cmd)
2543 unsigned char *buf, *addr;
2544 struct scatterlist *sg;
2545 unsigned int offset;
2549 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2551 * 1) read the specified logical block(s);
2552 * 2) transfer logical blocks from the data-out buffer;
2553 * 3) XOR the logical blocks transferred from the data-out buffer with
2554 * the logical blocks read, storing the resulting XOR data in a buffer;
2555 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2556 * blocks transferred from the data-out buffer; and
2557 * 5) transfer the resulting XOR data to the data-in buffer.
2559 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2561 pr_err("Unable to allocate xor_callback buf\n");
2565 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2566 * into the locally allocated *buf
2568 sg_copy_to_buffer(cmd->t_data_sg,
2574 * Now perform the XOR against the BIDI read memory located at
2575 * cmd->t_mem_bidi_list
2579 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2580 addr = kmap_atomic(sg_page(sg), KM_USER0);
2584 for (i = 0; i < sg->length; i++)
2585 *(addr + sg->offset + i) ^= *(buf + offset + i);
2587 offset += sg->length;
2588 kunmap_atomic(addr, KM_USER0);
2596 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2598 static int transport_get_sense_data(struct se_cmd *cmd)
2600 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2601 struct se_device *dev = cmd->se_dev;
2602 struct se_task *task = NULL, *task_tmp;
2603 unsigned long flags;
2606 WARN_ON(!cmd->se_lun);
2611 spin_lock_irqsave(&cmd->t_state_lock, flags);
2612 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2613 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2617 list_for_each_entry_safe(task, task_tmp,
2618 &cmd->t_task_list, t_list) {
2619 if (!task->task_sense)
2622 if (!dev->transport->get_sense_buffer) {
2623 pr_err("dev->transport->get_sense_buffer"
2628 sense_buffer = dev->transport->get_sense_buffer(task);
2629 if (!sense_buffer) {
2630 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2631 " sense buffer for task with sense\n",
2632 cmd->se_tfo->get_task_tag(cmd), task);
2635 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2637 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2638 TRANSPORT_SENSE_BUFFER);
2640 memcpy(&buffer[offset], sense_buffer,
2641 TRANSPORT_SENSE_BUFFER);
2642 cmd->scsi_status = task->task_scsi_status;
2643 /* Automatically padded */
2644 cmd->scsi_sense_length =
2645 (TRANSPORT_SENSE_BUFFER + offset);
2647 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2649 dev->se_hba->hba_id, dev->transport->name,
2653 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2659 transport_handle_reservation_conflict(struct se_cmd *cmd)
2661 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2662 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2663 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2665 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2666 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2669 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2672 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2673 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2674 cmd->orig_fe_lun, 0x2C,
2675 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2679 static inline long long transport_dev_end_lba(struct se_device *dev)
2681 return dev->transport->get_blocks(dev) + 1;
2684 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2686 struct se_device *dev = cmd->se_dev;
2689 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2692 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2694 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2695 pr_err("LBA: %llu Sectors: %u exceeds"
2696 " transport_dev_end_lba(): %llu\n",
2697 cmd->t_task_lba, sectors,
2698 transport_dev_end_lba(dev));
2705 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2708 * Determine if the received WRITE_SAME is used to for direct
2709 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2710 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2711 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2713 int passthrough = (dev->transport->transport_type ==
2714 TRANSPORT_PLUGIN_PHBA_PDEV);
2717 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2718 pr_err("WRITE_SAME PBDATA and LBDATA"
2719 " bits not supported for Block Discard"
2724 * Currently for the emulated case we only accept
2725 * tpws with the UNMAP=1 bit set.
2727 if (!(flags[0] & 0x08)) {
2728 pr_err("WRITE_SAME w/o UNMAP bit not"
2729 " supported for Block Discard Emulation\n");
2737 /* transport_generic_cmd_sequencer():
2739 * Generic Command Sequencer that should work for most DAS transport
2742 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2745 * FIXME: Need to support other SCSI OPCODES where as well.
2747 static int transport_generic_cmd_sequencer(
2751 struct se_device *dev = cmd->se_dev;
2752 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2753 int ret = 0, sector_ret = 0, passthrough;
2754 u32 sectors = 0, size = 0, pr_reg_type = 0;
2758 * Check for an existing UNIT ATTENTION condition
2760 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2761 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2762 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2766 * Check status of Asymmetric Logical Unit Assignment port
2768 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2771 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2772 * The ALUA additional sense code qualifier (ASCQ) is determined
2773 * by the ALUA primary or secondary access state..
2777 pr_debug("[%s]: ALUA TG Port not available,"
2778 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2779 cmd->se_tfo->get_fabric_name(), alua_ascq);
2781 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2782 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2783 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2786 goto out_invalid_cdb_field;
2789 * Check status for SPC-3 Persistent Reservations
2791 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2792 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2793 cmd, cdb, pr_reg_type) != 0)
2794 return transport_handle_reservation_conflict(cmd);
2796 * This means the CDB is allowed for the SCSI Initiator port
2797 * when said port is *NOT* holding the legacy SPC-2 or
2798 * SPC-3 Persistent Reservation.
2804 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2806 goto out_unsupported_cdb;
2807 size = transport_get_size(sectors, cdb, cmd);
2808 cmd->t_task_lba = transport_lba_21(cdb);
2809 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2812 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2814 goto out_unsupported_cdb;
2815 size = transport_get_size(sectors, cdb, cmd);
2816 cmd->t_task_lba = transport_lba_32(cdb);
2817 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2820 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2822 goto out_unsupported_cdb;
2823 size = transport_get_size(sectors, cdb, cmd);
2824 cmd->t_task_lba = transport_lba_32(cdb);
2825 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2828 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2830 goto out_unsupported_cdb;
2831 size = transport_get_size(sectors, cdb, cmd);
2832 cmd->t_task_lba = transport_lba_64(cdb);
2833 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2836 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2838 goto out_unsupported_cdb;
2839 size = transport_get_size(sectors, cdb, cmd);
2840 cmd->t_task_lba = transport_lba_21(cdb);
2841 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2844 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2846 goto out_unsupported_cdb;
2847 size = transport_get_size(sectors, cdb, cmd);
2848 cmd->t_task_lba = transport_lba_32(cdb);
2849 cmd->t_tasks_fua = (cdb[1] & 0x8);
2850 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2853 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2855 goto out_unsupported_cdb;
2856 size = transport_get_size(sectors, cdb, cmd);
2857 cmd->t_task_lba = transport_lba_32(cdb);
2858 cmd->t_tasks_fua = (cdb[1] & 0x8);
2859 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2862 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2864 goto out_unsupported_cdb;
2865 size = transport_get_size(sectors, cdb, cmd);
2866 cmd->t_task_lba = transport_lba_64(cdb);
2867 cmd->t_tasks_fua = (cdb[1] & 0x8);
2868 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2870 case XDWRITEREAD_10:
2871 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2872 !(cmd->t_tasks_bidi))
2873 goto out_invalid_cdb_field;
2874 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2876 goto out_unsupported_cdb;
2877 size = transport_get_size(sectors, cdb, cmd);
2878 cmd->t_task_lba = transport_lba_32(cdb);
2879 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2880 passthrough = (dev->transport->transport_type ==
2881 TRANSPORT_PLUGIN_PHBA_PDEV);
2883 * Skip the remaining assignments for TCM/PSCSI passthrough
2888 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2890 cmd->transport_complete_callback = &transport_xor_callback;
2891 cmd->t_tasks_fua = (cdb[1] & 0x8);
2893 case VARIABLE_LENGTH_CMD:
2894 service_action = get_unaligned_be16(&cdb[8]);
2896 * Determine if this is TCM/PSCSI device and we should disable
2897 * internal emulation for this CDB.
2899 passthrough = (dev->transport->transport_type ==
2900 TRANSPORT_PLUGIN_PHBA_PDEV);
2902 switch (service_action) {
2903 case XDWRITEREAD_32:
2904 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2906 goto out_unsupported_cdb;
2907 size = transport_get_size(sectors, cdb, cmd);
2909 * Use WRITE_32 and READ_32 opcodes for the emulated
2910 * XDWRITE_READ_32 logic.
2912 cmd->t_task_lba = transport_lba_64_ext(cdb);
2913 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2916 * Skip the remaining assignments for TCM/PSCSI passthrough
2922 * Setup BIDI XOR callback to be run during
2923 * transport_generic_complete_ok()
2925 cmd->transport_complete_callback = &transport_xor_callback;
2926 cmd->t_tasks_fua = (cdb[10] & 0x8);
2929 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2931 goto out_unsupported_cdb;
2934 size = transport_get_size(1, cdb, cmd);
2936 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2938 goto out_invalid_cdb_field;
2941 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2942 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2944 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2945 goto out_invalid_cdb_field;
2949 pr_err("VARIABLE_LENGTH_CMD service action"
2950 " 0x%04x not supported\n", service_action);
2951 goto out_unsupported_cdb;
2954 case MAINTENANCE_IN:
2955 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2956 /* MAINTENANCE_IN from SCC-2 */
2958 * Check for emulated MI_REPORT_TARGET_PGS.
2960 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2961 cmd->transport_emulate_cdb =
2962 (su_dev->t10_alua.alua_type ==
2963 SPC3_ALUA_EMULATED) ?
2964 core_emulate_report_target_port_groups :
2967 size = (cdb[6] << 24) | (cdb[7] << 16) |
2968 (cdb[8] << 8) | cdb[9];
2970 /* GPCMD_SEND_KEY from multi media commands */
2971 size = (cdb[8] << 8) + cdb[9];
2973 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2977 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2979 case MODE_SELECT_10:
2980 size = (cdb[7] << 8) + cdb[8];
2981 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2985 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2988 case GPCMD_READ_BUFFER_CAPACITY:
2989 case GPCMD_SEND_OPC:
2992 size = (cdb[7] << 8) + cdb[8];
2993 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2995 case READ_BLOCK_LIMITS:
2996 size = READ_BLOCK_LEN;
2997 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2999 case GPCMD_GET_CONFIGURATION:
3000 case GPCMD_READ_FORMAT_CAPACITIES:
3001 case GPCMD_READ_DISC_INFO:
3002 case GPCMD_READ_TRACK_RZONE_INFO:
3003 size = (cdb[7] << 8) + cdb[8];
3004 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3006 case PERSISTENT_RESERVE_IN:
3007 case PERSISTENT_RESERVE_OUT:
3008 cmd->transport_emulate_cdb =
3009 (su_dev->t10_pr.res_type ==
3010 SPC3_PERSISTENT_RESERVATIONS) ?
3011 core_scsi3_emulate_pr : NULL;
3012 size = (cdb[7] << 8) + cdb[8];
3013 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3015 case GPCMD_MECHANISM_STATUS:
3016 case GPCMD_READ_DVD_STRUCTURE:
3017 size = (cdb[8] << 8) + cdb[9];
3018 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3021 size = READ_POSITION_LEN;
3022 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3024 case MAINTENANCE_OUT:
3025 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3026 /* MAINTENANCE_OUT from SCC-2
3028 * Check for emulated MO_SET_TARGET_PGS.
3030 if (cdb[1] == MO_SET_TARGET_PGS) {
3031 cmd->transport_emulate_cdb =
3032 (su_dev->t10_alua.alua_type ==
3033 SPC3_ALUA_EMULATED) ?
3034 core_emulate_set_target_port_groups :
3038 size = (cdb[6] << 24) | (cdb[7] << 16) |
3039 (cdb[8] << 8) | cdb[9];
3041 /* GPCMD_REPORT_KEY from multi media commands */
3042 size = (cdb[8] << 8) + cdb[9];
3044 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3047 size = (cdb[3] << 8) + cdb[4];
3049 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3050 * See spc4r17 section 5.3
3052 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3053 cmd->sam_task_attr = MSG_HEAD_TAG;
3054 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3057 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3058 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3061 size = READ_CAP_LEN;
3062 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3064 case READ_MEDIA_SERIAL_NUMBER:
3065 case SECURITY_PROTOCOL_IN:
3066 case SECURITY_PROTOCOL_OUT:
3067 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3068 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3070 case SERVICE_ACTION_IN:
3071 case ACCESS_CONTROL_IN:
3072 case ACCESS_CONTROL_OUT:
3074 case READ_ATTRIBUTE:
3075 case RECEIVE_COPY_RESULTS:
3076 case WRITE_ATTRIBUTE:
3077 size = (cdb[10] << 24) | (cdb[11] << 16) |
3078 (cdb[12] << 8) | cdb[13];
3079 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3081 case RECEIVE_DIAGNOSTIC:
3082 case SEND_DIAGNOSTIC:
3083 size = (cdb[3] << 8) | cdb[4];
3084 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3086 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3089 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3090 size = (2336 * sectors);
3091 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3096 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3100 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3102 case READ_ELEMENT_STATUS:
3103 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3104 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3107 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3108 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3113 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3114 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3116 if (cdb[0] == RESERVE_10)
3117 size = (cdb[7] << 8) | cdb[8];
3119 size = cmd->data_length;
3122 * Setup the legacy emulated handler for SPC-2 and
3123 * >= SPC-3 compatible reservation handling (CRH=1)
3124 * Otherwise, we assume the underlying SCSI logic is
3125 * is running in SPC_PASSTHROUGH, and wants reservations
3126 * emulation disabled.
3128 cmd->transport_emulate_cdb =
3129 (su_dev->t10_pr.res_type !=
3131 core_scsi2_emulate_crh : NULL;
3132 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3137 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3138 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3140 if (cdb[0] == RELEASE_10)
3141 size = (cdb[7] << 8) | cdb[8];
3143 size = cmd->data_length;
3145 cmd->transport_emulate_cdb =
3146 (su_dev->t10_pr.res_type !=
3148 core_scsi2_emulate_crh : NULL;
3149 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3151 case SYNCHRONIZE_CACHE:
3152 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3154 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3156 if (cdb[0] == SYNCHRONIZE_CACHE) {
3157 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3158 cmd->t_task_lba = transport_lba_32(cdb);
3160 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3161 cmd->t_task_lba = transport_lba_64(cdb);
3164 goto out_unsupported_cdb;
3166 size = transport_get_size(sectors, cdb, cmd);
3167 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3170 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3172 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3175 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3176 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3178 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3180 * Check to ensure that LBA + Range does not exceed past end of
3181 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3183 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3184 if (transport_cmd_get_valid_sectors(cmd) < 0)
3185 goto out_invalid_cdb_field;
3189 size = get_unaligned_be16(&cdb[7]);
3190 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3193 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3195 goto out_unsupported_cdb;
3198 size = transport_get_size(1, cdb, cmd);
3200 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3201 goto out_invalid_cdb_field;
3204 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3205 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3207 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3208 goto out_invalid_cdb_field;
3211 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3213 goto out_unsupported_cdb;
3216 size = transport_get_size(1, cdb, cmd);
3218 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3219 goto out_invalid_cdb_field;
3222 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3223 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3225 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3226 * of byte 1 bit 3 UNMAP instead of original reserved field
3228 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3229 goto out_invalid_cdb_field;
3231 case ALLOW_MEDIUM_REMOVAL:
3232 case GPCMD_CLOSE_TRACK:
3234 case INITIALIZE_ELEMENT_STATUS:
3235 case GPCMD_LOAD_UNLOAD:
3238 case GPCMD_SET_SPEED:
3241 case TEST_UNIT_READY:
3243 case WRITE_FILEMARKS:
3245 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3248 cmd->transport_emulate_cdb =
3249 transport_core_report_lun_response;
3250 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3252 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3253 * See spc4r17 section 5.3
3255 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3256 cmd->sam_task_attr = MSG_HEAD_TAG;
3257 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3260 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3261 " 0x%02x, sending CHECK_CONDITION.\n",
3262 cmd->se_tfo->get_fabric_name(), cdb[0]);
3263 goto out_unsupported_cdb;
3266 if (size != cmd->data_length) {
3267 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3268 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3269 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3270 cmd->data_length, size, cdb[0]);
3272 cmd->cmd_spdtl = size;
3274 if (cmd->data_direction == DMA_TO_DEVICE) {
3275 pr_err("Rejecting underflow/overflow"
3277 goto out_invalid_cdb_field;
3280 * Reject READ_* or WRITE_* with overflow/underflow for
3281 * type SCF_SCSI_DATA_SG_IO_CDB.
3283 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3284 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3285 " CDB on non 512-byte sector setup subsystem"
3286 " plugin: %s\n", dev->transport->name);
3287 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3288 goto out_invalid_cdb_field;
3291 if (size > cmd->data_length) {
3292 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3293 cmd->residual_count = (size - cmd->data_length);
3295 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3296 cmd->residual_count = (cmd->data_length - size);
3298 cmd->data_length = size;
3301 /* Let's limit control cdbs to a page, for simplicity's sake. */
3302 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3304 goto out_invalid_cdb_field;
3306 transport_set_supported_SAM_opcode(cmd);
3309 out_unsupported_cdb:
3310 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3311 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3313 out_invalid_cdb_field:
3314 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3315 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3320 * Called from transport_generic_complete_ok() and
3321 * transport_generic_request_failure() to determine which dormant/delayed
3322 * and ordered cmds need to have their tasks added to the execution queue.
3324 static void transport_complete_task_attr(struct se_cmd *cmd)
3326 struct se_device *dev = cmd->se_dev;
3327 struct se_cmd *cmd_p, *cmd_tmp;
3328 int new_active_tasks = 0;
3330 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3331 atomic_dec(&dev->simple_cmds);
3332 smp_mb__after_atomic_dec();
3333 dev->dev_cur_ordered_id++;
3334 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3335 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3336 cmd->se_ordered_id);
3337 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3338 atomic_dec(&dev->dev_hoq_count);
3339 smp_mb__after_atomic_dec();
3340 dev->dev_cur_ordered_id++;
3341 pr_debug("Incremented dev_cur_ordered_id: %u for"
3342 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3343 cmd->se_ordered_id);
3344 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3345 spin_lock(&dev->ordered_cmd_lock);
3346 list_del(&cmd->se_ordered_node);
3347 atomic_dec(&dev->dev_ordered_sync);
3348 smp_mb__after_atomic_dec();
3349 spin_unlock(&dev->ordered_cmd_lock);
3351 dev->dev_cur_ordered_id++;
3352 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3353 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3356 * Process all commands up to the last received
3357 * ORDERED task attribute which requires another blocking
3360 spin_lock(&dev->delayed_cmd_lock);
3361 list_for_each_entry_safe(cmd_p, cmd_tmp,
3362 &dev->delayed_cmd_list, se_delayed_node) {
3364 list_del(&cmd_p->se_delayed_node);
3365 spin_unlock(&dev->delayed_cmd_lock);
3367 pr_debug("Calling add_tasks() for"
3368 " cmd_p: 0x%02x Task Attr: 0x%02x"
3369 " Dormant -> Active, se_ordered_id: %u\n",
3370 cmd_p->t_task_cdb[0],
3371 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3373 transport_add_tasks_from_cmd(cmd_p);
3376 spin_lock(&dev->delayed_cmd_lock);
3377 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3380 spin_unlock(&dev->delayed_cmd_lock);
3382 * If new tasks have become active, wake up the transport thread
3383 * to do the processing of the Active tasks.
3385 if (new_active_tasks != 0)
3386 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3389 static void transport_complete_qf(struct se_cmd *cmd)
3393 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3394 transport_complete_task_attr(cmd);
3396 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3397 ret = cmd->se_tfo->queue_status(cmd);
3402 switch (cmd->data_direction) {
3403 case DMA_FROM_DEVICE:
3404 ret = cmd->se_tfo->queue_data_in(cmd);
3407 if (cmd->t_bidi_data_sg) {
3408 ret = cmd->se_tfo->queue_data_in(cmd);
3412 /* Fall through for DMA_TO_DEVICE */
3414 ret = cmd->se_tfo->queue_status(cmd);
3422 transport_handle_queue_full(cmd, cmd->se_dev);
3425 transport_lun_remove_cmd(cmd);
3426 transport_cmd_check_stop_to_fabric(cmd);
3429 static void transport_handle_queue_full(
3431 struct se_device *dev)
3433 spin_lock_irq(&dev->qf_cmd_lock);
3434 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3435 atomic_inc(&dev->dev_qf_count);
3436 smp_mb__after_atomic_inc();
3437 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3439 schedule_work(&cmd->se_dev->qf_work_queue);
3442 static void transport_generic_complete_ok(struct se_cmd *cmd)
3444 int reason = 0, ret;
3446 * Check if we need to move delayed/dormant tasks from cmds on the
3447 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3450 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3451 transport_complete_task_attr(cmd);
3453 * Check to schedule QUEUE_FULL work, or execute an existing
3454 * cmd->transport_qf_callback()
3456 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3457 schedule_work(&cmd->se_dev->qf_work_queue);
3460 * Check if we need to retrieve a sense buffer from
3461 * the struct se_cmd in question.
3463 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3464 if (transport_get_sense_data(cmd) < 0)
3465 reason = TCM_NON_EXISTENT_LUN;
3468 * Only set when an struct se_task->task_scsi_status returned
3469 * a non GOOD status.
3471 if (cmd->scsi_status) {
3472 ret = transport_send_check_condition_and_sense(
3477 transport_lun_remove_cmd(cmd);
3478 transport_cmd_check_stop_to_fabric(cmd);
3483 * Check for a callback, used by amongst other things
3484 * XDWRITE_READ_10 emulation.
3486 if (cmd->transport_complete_callback)
3487 cmd->transport_complete_callback(cmd);
3489 switch (cmd->data_direction) {
3490 case DMA_FROM_DEVICE:
3491 spin_lock(&cmd->se_lun->lun_sep_lock);
3492 if (cmd->se_lun->lun_sep) {
3493 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3496 spin_unlock(&cmd->se_lun->lun_sep_lock);
3498 ret = cmd->se_tfo->queue_data_in(cmd);
3503 spin_lock(&cmd->se_lun->lun_sep_lock);
3504 if (cmd->se_lun->lun_sep) {
3505 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3508 spin_unlock(&cmd->se_lun->lun_sep_lock);
3510 * Check if we need to send READ payload for BIDI-COMMAND
3512 if (cmd->t_bidi_data_sg) {
3513 spin_lock(&cmd->se_lun->lun_sep_lock);
3514 if (cmd->se_lun->lun_sep) {
3515 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3518 spin_unlock(&cmd->se_lun->lun_sep_lock);
3519 ret = cmd->se_tfo->queue_data_in(cmd);
3524 /* Fall through for DMA_TO_DEVICE */
3526 ret = cmd->se_tfo->queue_status(cmd);
3534 transport_lun_remove_cmd(cmd);
3535 transport_cmd_check_stop_to_fabric(cmd);
3539 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3540 " data_direction: %d\n", cmd, cmd->data_direction);
3541 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3542 transport_handle_queue_full(cmd, cmd->se_dev);
3545 static void transport_free_dev_tasks(struct se_cmd *cmd)
3547 struct se_task *task, *task_tmp;
3548 unsigned long flags;
3549 LIST_HEAD(dispose_list);
3551 spin_lock_irqsave(&cmd->t_state_lock, flags);
3552 list_for_each_entry_safe(task, task_tmp,
3553 &cmd->t_task_list, t_list) {
3554 if (!(task->task_flags & TF_ACTIVE))
3555 list_move_tail(&task->t_list, &dispose_list);
3557 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3559 while (!list_empty(&dispose_list)) {
3560 task = list_first_entry(&dispose_list, struct se_task, t_list);
3563 * We already cancelled all pending timers in
3564 * transport_complete_task, but that was just a pure del_timer,
3565 * so do a full del_timer_sync here to make sure any handler
3566 * that was running at that point has finished execution.
3568 del_timer_sync(&task->task_timer);
3570 kfree(task->task_sg_bidi);
3571 kfree(task->task_sg);
3573 list_del(&task->t_list);
3575 cmd->se_dev->transport->free_task(task);
3579 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3581 struct scatterlist *sg;
3584 for_each_sg(sgl, sg, nents, count)
3585 __free_page(sg_page(sg));
3590 static inline void transport_free_pages(struct se_cmd *cmd)
3592 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3595 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3596 cmd->t_data_sg = NULL;
3597 cmd->t_data_nents = 0;
3599 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3600 cmd->t_bidi_data_sg = NULL;
3601 cmd->t_bidi_data_nents = 0;
3605 * transport_put_cmd - release a reference to a command
3606 * @cmd: command to release
3608 * This routine releases our reference to the command and frees it if possible.
3610 static void transport_put_cmd(struct se_cmd *cmd)
3612 unsigned long flags;
3615 spin_lock_irqsave(&cmd->t_state_lock, flags);
3616 if (atomic_read(&cmd->t_fe_count)) {
3617 if (!atomic_dec_and_test(&cmd->t_fe_count))
3621 if (atomic_read(&cmd->t_se_count)) {
3622 if (!atomic_dec_and_test(&cmd->t_se_count))
3626 if (atomic_read(&cmd->transport_dev_active)) {
3627 atomic_set(&cmd->transport_dev_active, 0);
3628 transport_all_task_dev_remove_state(cmd);
3631 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3633 if (free_tasks != 0)
3634 transport_free_dev_tasks(cmd);
3636 transport_free_pages(cmd);
3637 transport_release_cmd(cmd);
3640 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3644 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3645 * allocating in the core.
3646 * @cmd: Associated se_cmd descriptor
3647 * @mem: SGL style memory for TCM WRITE / READ
3648 * @sg_mem_num: Number of SGL elements
3649 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3650 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3652 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3655 int transport_generic_map_mem_to_cmd(
3657 struct scatterlist *sgl,
3659 struct scatterlist *sgl_bidi,
3662 if (!sgl || !sgl_count)
3665 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3666 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3668 cmd->t_data_sg = sgl;
3669 cmd->t_data_nents = sgl_count;
3671 if (sgl_bidi && sgl_bidi_count) {
3672 cmd->t_bidi_data_sg = sgl_bidi;
3673 cmd->t_bidi_data_nents = sgl_bidi_count;
3675 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3680 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3682 static int transport_new_cmd_obj(struct se_cmd *cmd)
3684 struct se_device *dev = cmd->se_dev;
3685 int set_counts = 1, rc, task_cdbs;
3688 * Setup any BIDI READ tasks and memory from
3689 * cmd->t_mem_bidi_list so the READ struct se_tasks
3690 * are queued first for the non pSCSI passthrough case.
3692 if (cmd->t_bidi_data_sg &&
3693 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3694 rc = transport_allocate_tasks(cmd,
3697 cmd->t_bidi_data_sg,
3698 cmd->t_bidi_data_nents);
3700 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3701 cmd->scsi_sense_reason =
3702 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3705 atomic_inc(&cmd->t_fe_count);
3706 atomic_inc(&cmd->t_se_count);
3710 * Setup the tasks and memory from cmd->t_mem_list
3711 * Note for BIDI transfers this will contain the WRITE payload
3713 task_cdbs = transport_allocate_tasks(cmd,
3715 cmd->data_direction,
3718 if (task_cdbs <= 0) {
3719 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3720 cmd->scsi_sense_reason =
3721 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3726 atomic_inc(&cmd->t_fe_count);
3727 atomic_inc(&cmd->t_se_count);
3730 cmd->t_task_list_num = task_cdbs;
3732 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3733 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3734 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
3738 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3740 struct scatterlist *sg = cmd->t_data_sg;
3744 * We need to take into account a possible offset here for fabrics like
3745 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3746 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3748 return kmap(sg_page(sg)) + sg->offset;
3750 EXPORT_SYMBOL(transport_kmap_first_data_page);
3752 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3754 kunmap(sg_page(cmd->t_data_sg));
3756 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3759 transport_generic_get_mem(struct se_cmd *cmd)
3761 u32 length = cmd->data_length;
3766 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3767 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3768 if (!cmd->t_data_sg)
3771 cmd->t_data_nents = nents;
3772 sg_init_table(cmd->t_data_sg, nents);
3775 u32 page_len = min_t(u32, length, PAGE_SIZE);
3776 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3780 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3788 __free_page(sg_page(&cmd->t_data_sg[i]));
3791 kfree(cmd->t_data_sg);
3792 cmd->t_data_sg = NULL;
3796 /* Reduce sectors if they are too long for the device */
3797 static inline sector_t transport_limit_task_sectors(
3798 struct se_device *dev,
3799 unsigned long long lba,
3802 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3804 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3805 if ((lba + sectors) > transport_dev_end_lba(dev))
3806 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3813 * This function can be used by HW target mode drivers to create a linked
3814 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3815 * This is intended to be called during the completion path by TCM Core
3816 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3818 void transport_do_task_sg_chain(struct se_cmd *cmd)
3820 struct scatterlist *sg_first = NULL;
3821 struct scatterlist *sg_prev = NULL;
3822 int sg_prev_nents = 0;
3823 struct scatterlist *sg;
3824 struct se_task *task;
3825 u32 chained_nents = 0;
3828 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3831 * Walk the struct se_task list and setup scatterlist chains
3832 * for each contiguously allocated struct se_task->task_sg[].
3834 list_for_each_entry(task, &cmd->t_task_list, t_list) {
3839 sg_first = task->task_sg;
3840 chained_nents = task->task_sg_nents;
3842 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3843 chained_nents += task->task_sg_nents;
3846 * For the padded tasks, use the extra SGL vector allocated
3847 * in transport_allocate_data_tasks() for the sg_prev_nents
3848 * offset into sg_chain() above.
3850 * We do not need the padding for the last task (or a single
3851 * task), but in that case we will never use the sg_prev_nents
3852 * value below which would be incorrect.
3854 sg_prev_nents = (task->task_sg_nents + 1);
3855 sg_prev = task->task_sg;
3858 * Setup the starting pointer and total t_tasks_sg_linked_no including
3859 * padding SGs for linking and to mark the end.
3861 cmd->t_tasks_sg_chained = sg_first;
3862 cmd->t_tasks_sg_chained_no = chained_nents;
3864 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3865 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3866 cmd->t_tasks_sg_chained_no);
3868 for_each_sg(cmd->t_tasks_sg_chained, sg,
3869 cmd->t_tasks_sg_chained_no, i) {
3871 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3872 i, sg, sg_page(sg), sg->length, sg->offset);
3873 if (sg_is_chain(sg))
3874 pr_debug("SG: %p sg_is_chain=1\n", sg);
3876 pr_debug("SG: %p sg_is_last=1\n", sg);
3879 EXPORT_SYMBOL(transport_do_task_sg_chain);
3882 * Break up cmd into chunks transport can handle
3884 static int transport_allocate_data_tasks(
3886 unsigned long long lba,
3887 enum dma_data_direction data_direction,
3888 struct scatterlist *sgl,
3889 unsigned int sgl_nents)
3891 struct se_task *task;
3892 struct se_device *dev = cmd->se_dev;
3893 unsigned long flags;
3895 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3896 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3897 struct scatterlist *sg;
3898 struct scatterlist *cmd_sg;
3900 WARN_ON(cmd->data_length % sector_size);
3901 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3902 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3905 for (i = 0; i < task_count; i++) {
3906 unsigned int task_size, task_sg_nents_padded;
3909 task = transport_generic_get_task(cmd, data_direction);
3913 task->task_lba = lba;
3914 task->task_sectors = min(sectors, dev_max_sectors);
3915 task->task_size = task->task_sectors * sector_size;
3918 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3919 * in order to calculate the number per task SGL entries
3921 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3923 * Check if the fabric module driver is requesting that all
3924 * struct se_task->task_sg[] be chained together.. If so,
3925 * then allocate an extra padding SG entry for linking and
3926 * marking the end of the chained SGL for every task except
3927 * the last one for (task_count > 1) operation, or skipping
3928 * the extra padding for the (task_count == 1) case.
3930 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3931 task_sg_nents_padded = (task->task_sg_nents + 1);
3933 task_sg_nents_padded = task->task_sg_nents;
3935 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3936 task_sg_nents_padded, GFP_KERNEL);
3937 if (!task->task_sg) {
3938 cmd->se_dev->transport->free_task(task);
3942 sg_init_table(task->task_sg, task_sg_nents_padded);
3944 task_size = task->task_size;
3946 /* Build new sgl, only up to task_size */
3947 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3948 if (cmd_sg->length > task_size)
3952 task_size -= cmd_sg->length;
3953 cmd_sg = sg_next(cmd_sg);
3956 lba += task->task_sectors;
3957 sectors -= task->task_sectors;
3959 spin_lock_irqsave(&cmd->t_state_lock, flags);
3960 list_add_tail(&task->t_list, &cmd->t_task_list);
3961 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3968 transport_allocate_control_task(struct se_cmd *cmd)
3970 struct se_task *task;
3971 unsigned long flags;
3973 task = transport_generic_get_task(cmd, cmd->data_direction);
3977 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
3979 if (!task->task_sg) {
3980 cmd->se_dev->transport->free_task(task);
3984 memcpy(task->task_sg, cmd->t_data_sg,
3985 sizeof(struct scatterlist) * cmd->t_data_nents);
3986 task->task_size = cmd->data_length;
3987 task->task_sg_nents = cmd->t_data_nents;
3989 spin_lock_irqsave(&cmd->t_state_lock, flags);
3990 list_add_tail(&task->t_list, &cmd->t_task_list);
3991 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3993 /* Success! Return number of tasks allocated */
3997 static u32 transport_allocate_tasks(
3999 unsigned long long lba,
4000 enum dma_data_direction data_direction,
4001 struct scatterlist *sgl,
4002 unsigned int sgl_nents)
4004 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4005 if (transport_cmd_get_valid_sectors(cmd) < 0)
4008 return transport_allocate_data_tasks(cmd, lba, data_direction,
4011 return transport_allocate_control_task(cmd);
4016 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4018 * Allocate storage transport resources from a set of values predefined
4019 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4020 * Any non zero return here is treated as an "out of resource' op here.
4023 * Generate struct se_task(s) and/or their payloads for this CDB.
4025 int transport_generic_new_cmd(struct se_cmd *cmd)
4030 * Determine is the TCM fabric module has already allocated physical
4031 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4034 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4036 ret = transport_generic_get_mem(cmd);
4041 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4042 * control or data CDB types, and perform the map to backend subsystem
4043 * code from SGL memory allocated here by transport_generic_get_mem(), or
4044 * via pre-existing SGL memory setup explictly by fabric module code with
4045 * transport_generic_map_mem_to_cmd().
4047 ret = transport_new_cmd_obj(cmd);
4051 * For WRITEs, let the fabric know its buffer is ready..
4052 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4053 * will be added to the struct se_device execution queue after its WRITE
4054 * data has arrived. (ie: It gets handled by the transport processing
4055 * thread a second time)
4057 if (cmd->data_direction == DMA_TO_DEVICE) {
4058 transport_add_tasks_to_state_queue(cmd);
4059 return transport_generic_write_pending(cmd);
4062 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4063 * to the execution queue.
4065 transport_execute_tasks(cmd);
4068 EXPORT_SYMBOL(transport_generic_new_cmd);
4070 /* transport_generic_process_write():
4074 void transport_generic_process_write(struct se_cmd *cmd)
4076 transport_execute_tasks(cmd);
4078 EXPORT_SYMBOL(transport_generic_process_write);
4080 static void transport_write_pending_qf(struct se_cmd *cmd)
4082 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4083 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4085 transport_handle_queue_full(cmd, cmd->se_dev);
4089 static int transport_generic_write_pending(struct se_cmd *cmd)
4091 unsigned long flags;
4094 spin_lock_irqsave(&cmd->t_state_lock, flags);
4095 cmd->t_state = TRANSPORT_WRITE_PENDING;
4096 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4099 * Clear the se_cmd for WRITE_PENDING status in order to set
4100 * cmd->t_transport_active=0 so that transport_generic_handle_data
4101 * can be called from HW target mode interrupt code. This is safe
4102 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4103 * because the se_cmd->se_lun pointer is not being cleared.
4105 transport_cmd_check_stop(cmd, 1, 0);
4108 * Call the fabric write_pending function here to let the
4109 * frontend know that WRITE buffers are ready.
4111 ret = cmd->se_tfo->write_pending(cmd);
4117 return PYX_TRANSPORT_WRITE_PENDING;
4120 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
4121 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4122 transport_handle_queue_full(cmd, cmd->se_dev);
4127 * transport_release_cmd - free a command
4128 * @cmd: command to free
4130 * This routine unconditionally frees a command, and reference counting
4131 * or list removal must be done in the caller.
4133 void transport_release_cmd(struct se_cmd *cmd)
4135 BUG_ON(!cmd->se_tfo);
4137 if (cmd->se_tmr_req)
4138 core_tmr_release_req(cmd->se_tmr_req);
4139 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4140 kfree(cmd->t_task_cdb);
4141 cmd->se_tfo->release_cmd(cmd);
4143 EXPORT_SYMBOL(transport_release_cmd);
4145 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
4147 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4148 if (wait_for_tasks && cmd->se_tmr_req)
4149 transport_wait_for_tasks(cmd);
4151 transport_release_cmd(cmd);
4154 transport_wait_for_tasks(cmd);
4156 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4159 transport_lun_remove_cmd(cmd);
4161 transport_free_dev_tasks(cmd);
4163 transport_put_cmd(cmd);
4166 EXPORT_SYMBOL(transport_generic_free_cmd);
4168 /* transport_lun_wait_for_tasks():
4170 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4171 * an struct se_lun to be successfully shutdown.
4173 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4175 unsigned long flags;
4178 * If the frontend has already requested this struct se_cmd to
4179 * be stopped, we can safely ignore this struct se_cmd.
4181 spin_lock_irqsave(&cmd->t_state_lock, flags);
4182 if (atomic_read(&cmd->t_transport_stop)) {
4183 atomic_set(&cmd->transport_lun_stop, 0);
4184 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4185 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4186 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4187 transport_cmd_check_stop(cmd, 1, 0);
4190 atomic_set(&cmd->transport_lun_fe_stop, 1);
4191 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4193 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4195 ret = transport_stop_tasks_for_cmd(cmd);
4197 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4198 " %d\n", cmd, cmd->t_task_list_num, ret);
4200 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4201 cmd->se_tfo->get_task_tag(cmd));
4202 wait_for_completion(&cmd->transport_lun_stop_comp);
4203 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4204 cmd->se_tfo->get_task_tag(cmd));
4206 transport_remove_cmd_from_queue(cmd);
4211 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4213 struct se_cmd *cmd = NULL;
4214 unsigned long lun_flags, cmd_flags;
4216 * Do exception processing and return CHECK_CONDITION status to the
4219 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4220 while (!list_empty(&lun->lun_cmd_list)) {
4221 cmd = list_first_entry(&lun->lun_cmd_list,
4222 struct se_cmd, se_lun_node);
4223 list_del(&cmd->se_lun_node);
4225 atomic_set(&cmd->transport_lun_active, 0);
4227 * This will notify iscsi_target_transport.c:
4228 * transport_cmd_check_stop() that a LUN shutdown is in
4229 * progress for the iscsi_cmd_t.
4231 spin_lock(&cmd->t_state_lock);
4232 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4233 "_lun_stop for ITT: 0x%08x\n",
4234 cmd->se_lun->unpacked_lun,
4235 cmd->se_tfo->get_task_tag(cmd));
4236 atomic_set(&cmd->transport_lun_stop, 1);
4237 spin_unlock(&cmd->t_state_lock);
4239 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4242 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4243 cmd->se_tfo->get_task_tag(cmd),
4244 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4248 * If the Storage engine still owns the iscsi_cmd_t, determine
4249 * and/or stop its context.
4251 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4252 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4253 cmd->se_tfo->get_task_tag(cmd));
4255 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4256 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4260 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4261 "_wait_for_tasks(): SUCCESS\n",
4262 cmd->se_lun->unpacked_lun,
4263 cmd->se_tfo->get_task_tag(cmd));
4265 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4266 if (!atomic_read(&cmd->transport_dev_active)) {
4267 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4270 atomic_set(&cmd->transport_dev_active, 0);
4271 transport_all_task_dev_remove_state(cmd);
4272 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4274 transport_free_dev_tasks(cmd);
4276 * The Storage engine stopped this struct se_cmd before it was
4277 * send to the fabric frontend for delivery back to the
4278 * Initiator Node. Return this SCSI CDB back with an
4279 * CHECK_CONDITION status.
4282 transport_send_check_condition_and_sense(cmd,
4283 TCM_NON_EXISTENT_LUN, 0);
4285 * If the fabric frontend is waiting for this iscsi_cmd_t to
4286 * be released, notify the waiting thread now that LU has
4287 * finished accessing it.
4289 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4290 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4291 pr_debug("SE_LUN[%d] - Detected FE stop for"
4292 " struct se_cmd: %p ITT: 0x%08x\n",
4294 cmd, cmd->se_tfo->get_task_tag(cmd));
4296 spin_unlock_irqrestore(&cmd->t_state_lock,
4298 transport_cmd_check_stop(cmd, 1, 0);
4299 complete(&cmd->transport_lun_fe_stop_comp);
4300 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4303 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4304 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4306 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4307 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4309 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4312 static int transport_clear_lun_thread(void *p)
4314 struct se_lun *lun = (struct se_lun *)p;
4316 __transport_clear_lun_from_sessions(lun);
4317 complete(&lun->lun_shutdown_comp);
4322 int transport_clear_lun_from_sessions(struct se_lun *lun)
4324 struct task_struct *kt;
4326 kt = kthread_run(transport_clear_lun_thread, lun,
4327 "tcm_cl_%u", lun->unpacked_lun);
4329 pr_err("Unable to start clear_lun thread\n");
4332 wait_for_completion(&lun->lun_shutdown_comp);
4338 * transport_wait_for_tasks - wait for completion to occur
4339 * @cmd: command to wait
4341 * Called from frontend fabric context to wait for storage engine
4342 * to pause and/or release frontend generated struct se_cmd.
4344 void transport_wait_for_tasks(struct se_cmd *cmd)
4346 unsigned long flags;
4348 spin_lock_irqsave(&cmd->t_state_lock, flags);
4349 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4350 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4354 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4355 * has been set in transport_set_supported_SAM_opcode().
4357 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4358 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4362 * If we are already stopped due to an external event (ie: LUN shutdown)
4363 * sleep until the connection can have the passed struct se_cmd back.
4364 * The cmd->transport_lun_stopped_sem will be upped by
4365 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4366 * has completed its operation on the struct se_cmd.
4368 if (atomic_read(&cmd->transport_lun_stop)) {
4370 pr_debug("wait_for_tasks: Stopping"
4371 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4372 "_stop_comp); for ITT: 0x%08x\n",
4373 cmd->se_tfo->get_task_tag(cmd));
4375 * There is a special case for WRITES where a FE exception +
4376 * LUN shutdown means ConfigFS context is still sleeping on
4377 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4378 * We go ahead and up transport_lun_stop_comp just to be sure
4381 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4382 complete(&cmd->transport_lun_stop_comp);
4383 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4384 spin_lock_irqsave(&cmd->t_state_lock, flags);
4386 transport_all_task_dev_remove_state(cmd);
4388 * At this point, the frontend who was the originator of this
4389 * struct se_cmd, now owns the structure and can be released through
4390 * normal means below.
4392 pr_debug("wait_for_tasks: Stopped"
4393 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4394 "stop_comp); for ITT: 0x%08x\n",
4395 cmd->se_tfo->get_task_tag(cmd));
4397 atomic_set(&cmd->transport_lun_stop, 0);
4399 if (!atomic_read(&cmd->t_transport_active) ||
4400 atomic_read(&cmd->t_transport_aborted)) {
4401 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4405 atomic_set(&cmd->t_transport_stop, 1);
4407 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4408 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4409 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4410 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
4411 cmd->deferred_t_state);
4413 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4415 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4417 wait_for_completion(&cmd->t_transport_stop_comp);
4419 spin_lock_irqsave(&cmd->t_state_lock, flags);
4420 atomic_set(&cmd->t_transport_active, 0);
4421 atomic_set(&cmd->t_transport_stop, 0);
4423 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4424 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4425 cmd->se_tfo->get_task_tag(cmd));
4427 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4429 EXPORT_SYMBOL(transport_wait_for_tasks);
4431 static int transport_get_sense_codes(
4436 *asc = cmd->scsi_asc;
4437 *ascq = cmd->scsi_ascq;
4442 static int transport_set_sense_codes(
4447 cmd->scsi_asc = asc;
4448 cmd->scsi_ascq = ascq;
4453 int transport_send_check_condition_and_sense(
4458 unsigned char *buffer = cmd->sense_buffer;
4459 unsigned long flags;
4461 u8 asc = 0, ascq = 0;
4463 spin_lock_irqsave(&cmd->t_state_lock, flags);
4464 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4465 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4468 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4469 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4471 if (!reason && from_transport)
4474 if (!from_transport)
4475 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4477 * Data Segment and SenseLength of the fabric response PDU.
4479 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4480 * from include/scsi/scsi_cmnd.h
4482 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4483 TRANSPORT_SENSE_BUFFER);
4485 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4486 * SENSE KEY values from include/scsi/scsi.h
4489 case TCM_NON_EXISTENT_LUN:
4491 buffer[offset] = 0x70;
4492 /* ILLEGAL REQUEST */
4493 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4494 /* LOGICAL UNIT NOT SUPPORTED */
4495 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4497 case TCM_UNSUPPORTED_SCSI_OPCODE:
4498 case TCM_SECTOR_COUNT_TOO_MANY:
4500 buffer[offset] = 0x70;
4501 /* ILLEGAL REQUEST */
4502 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4503 /* INVALID COMMAND OPERATION CODE */
4504 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4506 case TCM_UNKNOWN_MODE_PAGE:
4508 buffer[offset] = 0x70;
4509 /* ILLEGAL REQUEST */
4510 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4511 /* INVALID FIELD IN CDB */
4512 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4514 case TCM_CHECK_CONDITION_ABORT_CMD:
4516 buffer[offset] = 0x70;
4517 /* ABORTED COMMAND */
4518 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4519 /* BUS DEVICE RESET FUNCTION OCCURRED */
4520 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4521 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4523 case TCM_INCORRECT_AMOUNT_OF_DATA:
4525 buffer[offset] = 0x70;
4526 /* ABORTED COMMAND */
4527 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4529 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4530 /* NOT ENOUGH UNSOLICITED DATA */
4531 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4533 case TCM_INVALID_CDB_FIELD:
4535 buffer[offset] = 0x70;
4536 /* ABORTED COMMAND */
4537 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4538 /* INVALID FIELD IN CDB */
4539 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4541 case TCM_INVALID_PARAMETER_LIST:
4543 buffer[offset] = 0x70;
4544 /* ABORTED COMMAND */
4545 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4546 /* INVALID FIELD IN PARAMETER LIST */
4547 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4549 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4551 buffer[offset] = 0x70;
4552 /* ABORTED COMMAND */
4553 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4555 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4556 /* UNEXPECTED_UNSOLICITED_DATA */
4557 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4559 case TCM_SERVICE_CRC_ERROR:
4561 buffer[offset] = 0x70;
4562 /* ABORTED COMMAND */
4563 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4564 /* PROTOCOL SERVICE CRC ERROR */
4565 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4567 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4569 case TCM_SNACK_REJECTED:
4571 buffer[offset] = 0x70;
4572 /* ABORTED COMMAND */
4573 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4575 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4576 /* FAILED RETRANSMISSION REQUEST */
4577 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4579 case TCM_WRITE_PROTECTED:
4581 buffer[offset] = 0x70;
4583 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4584 /* WRITE PROTECTED */
4585 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4587 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4589 buffer[offset] = 0x70;
4590 /* UNIT ATTENTION */
4591 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4592 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4593 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4594 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4596 case TCM_CHECK_CONDITION_NOT_READY:
4598 buffer[offset] = 0x70;
4600 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4601 transport_get_sense_codes(cmd, &asc, &ascq);
4602 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4603 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4605 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4608 buffer[offset] = 0x70;
4609 /* ILLEGAL REQUEST */
4610 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4611 /* LOGICAL UNIT COMMUNICATION FAILURE */
4612 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4616 * This code uses linux/include/scsi/scsi.h SAM status codes!
4618 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4620 * Automatically padded, this value is encoded in the fabric's
4621 * data_length response PDU containing the SCSI defined sense data.
4623 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4626 return cmd->se_tfo->queue_status(cmd);
4628 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4630 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4634 if (atomic_read(&cmd->t_transport_aborted) != 0) {
4636 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4639 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4640 " status for CDB: 0x%02x ITT: 0x%08x\n",
4642 cmd->se_tfo->get_task_tag(cmd));
4644 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4645 cmd->se_tfo->queue_status(cmd);
4650 EXPORT_SYMBOL(transport_check_aborted_status);
4652 void transport_send_task_abort(struct se_cmd *cmd)
4654 unsigned long flags;
4656 spin_lock_irqsave(&cmd->t_state_lock, flags);
4657 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4658 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4661 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4664 * If there are still expected incoming fabric WRITEs, we wait
4665 * until until they have completed before sending a TASK_ABORTED
4666 * response. This response with TASK_ABORTED status will be
4667 * queued back to fabric module by transport_check_aborted_status().
4669 if (cmd->data_direction == DMA_TO_DEVICE) {
4670 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4671 atomic_inc(&cmd->t_transport_aborted);
4672 smp_mb__after_atomic_inc();
4673 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4674 transport_new_cmd_failure(cmd);
4678 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4680 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4681 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4682 cmd->se_tfo->get_task_tag(cmd));
4684 cmd->se_tfo->queue_status(cmd);
4687 /* transport_generic_do_tmr():
4691 int transport_generic_do_tmr(struct se_cmd *cmd)
4693 struct se_device *dev = cmd->se_dev;
4694 struct se_tmr_req *tmr = cmd->se_tmr_req;
4697 switch (tmr->function) {
4698 case TMR_ABORT_TASK:
4699 tmr->response = TMR_FUNCTION_REJECTED;
4701 case TMR_ABORT_TASK_SET:
4703 case TMR_CLEAR_TASK_SET:
4704 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4707 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4708 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4709 TMR_FUNCTION_REJECTED;
4711 case TMR_TARGET_WARM_RESET:
4712 tmr->response = TMR_FUNCTION_REJECTED;
4714 case TMR_TARGET_COLD_RESET:
4715 tmr->response = TMR_FUNCTION_REJECTED;
4718 pr_err("Uknown TMR function: 0x%02x.\n",
4720 tmr->response = TMR_FUNCTION_REJECTED;
4724 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4725 cmd->se_tfo->queue_tm_rsp(cmd);
4727 transport_cmd_check_stop_to_fabric(cmd);
4731 /* transport_processing_thread():
4735 static int transport_processing_thread(void *param)
4739 struct se_device *dev = (struct se_device *) param;
4741 set_user_nice(current, -20);
4743 while (!kthread_should_stop()) {
4744 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4745 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4746 kthread_should_stop());
4751 __transport_execute_tasks(dev);
4753 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4757 switch (cmd->t_state) {
4758 case TRANSPORT_NEW_CMD:
4761 case TRANSPORT_NEW_CMD_MAP:
4762 if (!cmd->se_tfo->new_cmd_map) {
4763 pr_err("cmd->se_tfo->new_cmd_map is"
4764 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4767 ret = cmd->se_tfo->new_cmd_map(cmd);
4769 cmd->transport_error_status = ret;
4770 transport_generic_request_failure(cmd, NULL,
4771 0, (cmd->data_direction !=
4775 ret = transport_generic_new_cmd(cmd);
4779 cmd->transport_error_status = ret;
4780 transport_generic_request_failure(cmd, NULL,
4781 0, (cmd->data_direction !=
4785 case TRANSPORT_PROCESS_WRITE:
4786 transport_generic_process_write(cmd);
4788 case TRANSPORT_COMPLETE_OK:
4789 transport_generic_complete_ok(cmd);
4791 case TRANSPORT_REMOVE:
4792 transport_put_cmd(cmd);
4794 case TRANSPORT_FREE_CMD_INTR:
4795 transport_generic_free_cmd(cmd, 0);
4797 case TRANSPORT_PROCESS_TMR:
4798 transport_generic_do_tmr(cmd);
4800 case TRANSPORT_COMPLETE_FAILURE:
4801 transport_generic_request_failure(cmd, NULL, 1, 1);
4803 case TRANSPORT_COMPLETE_TIMEOUT:
4804 transport_generic_request_timeout(cmd);
4806 case TRANSPORT_COMPLETE_QF_WP:
4807 transport_write_pending_qf(cmd);
4809 case TRANSPORT_COMPLETE_QF_OK:
4810 transport_complete_qf(cmd);
4813 pr_err("Unknown t_state: %d deferred_t_state:"
4814 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
4815 " %u\n", cmd->t_state, cmd->deferred_t_state,
4816 cmd->se_tfo->get_task_tag(cmd),
4817 cmd->se_tfo->get_cmd_state(cmd),
4818 cmd->se_lun->unpacked_lun);
4826 WARN_ON(!list_empty(&dev->state_task_list));
4827 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4828 dev->process_thread = NULL;