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 <linux/module.h>
40 #include <asm/unaligned.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_cmnd.h>
45 #include <scsi/scsi_tcq.h>
47 #include <target/target_core_base.h>
48 #include <target/target_core_backend.h>
49 #include <target/target_core_fabric.h>
50 #include <target/target_core_configfs.h>
52 #include "target_core_internal.h"
53 #include "target_core_alua.h"
54 #include "target_core_pr.h"
55 #include "target_core_ua.h"
57 static int sub_api_initialized;
59 static struct workqueue_struct *target_completion_wq;
60 static struct kmem_cache *se_sess_cache;
61 struct kmem_cache *se_ua_cache;
62 struct kmem_cache *t10_pr_reg_cache;
63 struct kmem_cache *t10_alua_lu_gp_cache;
64 struct kmem_cache *t10_alua_lu_gp_mem_cache;
65 struct kmem_cache *t10_alua_tg_pt_gp_cache;
66 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68 static int transport_generic_write_pending(struct se_cmd *);
69 static int transport_processing_thread(void *param);
70 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
71 static void transport_complete_task_attr(struct se_cmd *cmd);
72 static void transport_handle_queue_full(struct se_cmd *cmd,
73 struct se_device *dev);
74 static void transport_free_dev_tasks(struct se_cmd *cmd);
75 static int transport_generic_get_mem(struct se_cmd *cmd);
76 static void transport_put_cmd(struct se_cmd *cmd);
77 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
78 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
79 static void transport_generic_request_failure(struct se_cmd *);
80 static void target_complete_ok_work(struct work_struct *work);
82 int init_se_kmem_caches(void)
84 se_sess_cache = kmem_cache_create("se_sess_cache",
85 sizeof(struct se_session), __alignof__(struct se_session),
88 pr_err("kmem_cache_create() for struct se_session"
92 se_ua_cache = kmem_cache_create("se_ua_cache",
93 sizeof(struct se_ua), __alignof__(struct se_ua),
96 pr_err("kmem_cache_create() for struct se_ua failed\n");
97 goto out_free_sess_cache;
99 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
100 sizeof(struct t10_pr_registration),
101 __alignof__(struct t10_pr_registration), 0, NULL);
102 if (!t10_pr_reg_cache) {
103 pr_err("kmem_cache_create() for struct t10_pr_registration"
105 goto out_free_ua_cache;
107 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
108 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
110 if (!t10_alua_lu_gp_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
113 goto out_free_pr_reg_cache;
115 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
116 sizeof(struct t10_alua_lu_gp_member),
117 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
118 if (!t10_alua_lu_gp_mem_cache) {
119 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
121 goto out_free_lu_gp_cache;
123 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
124 sizeof(struct t10_alua_tg_pt_gp),
125 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
126 if (!t10_alua_tg_pt_gp_cache) {
127 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
129 goto out_free_lu_gp_mem_cache;
131 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
132 "t10_alua_tg_pt_gp_mem_cache",
133 sizeof(struct t10_alua_tg_pt_gp_member),
134 __alignof__(struct t10_alua_tg_pt_gp_member),
136 if (!t10_alua_tg_pt_gp_mem_cache) {
137 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
139 goto out_free_tg_pt_gp_cache;
142 target_completion_wq = alloc_workqueue("target_completion",
144 if (!target_completion_wq)
145 goto out_free_tg_pt_gp_mem_cache;
149 out_free_tg_pt_gp_mem_cache:
150 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
151 out_free_tg_pt_gp_cache:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
153 out_free_lu_gp_mem_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
155 out_free_lu_gp_cache:
156 kmem_cache_destroy(t10_alua_lu_gp_cache);
157 out_free_pr_reg_cache:
158 kmem_cache_destroy(t10_pr_reg_cache);
160 kmem_cache_destroy(se_ua_cache);
162 kmem_cache_destroy(se_sess_cache);
167 void release_se_kmem_caches(void)
169 destroy_workqueue(target_completion_wq);
170 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
172 kmem_cache_destroy(t10_pr_reg_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
176 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
179 /* This code ensures unique mib indexes are handed out. */
180 static DEFINE_SPINLOCK(scsi_mib_index_lock);
181 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
184 * Allocate a new row index for the entry type specified
186 u32 scsi_get_new_index(scsi_index_t type)
190 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
192 spin_lock(&scsi_mib_index_lock);
193 new_index = ++scsi_mib_index[type];
194 spin_unlock(&scsi_mib_index_lock);
199 static void transport_init_queue_obj(struct se_queue_obj *qobj)
201 atomic_set(&qobj->queue_cnt, 0);
202 INIT_LIST_HEAD(&qobj->qobj_list);
203 init_waitqueue_head(&qobj->thread_wq);
204 spin_lock_init(&qobj->cmd_queue_lock);
207 void transport_subsystem_check_init(void)
211 if (sub_api_initialized)
214 ret = request_module("target_core_iblock");
216 pr_err("Unable to load target_core_iblock\n");
218 ret = request_module("target_core_file");
220 pr_err("Unable to load target_core_file\n");
222 ret = request_module("target_core_pscsi");
224 pr_err("Unable to load target_core_pscsi\n");
226 ret = request_module("target_core_stgt");
228 pr_err("Unable to load target_core_stgt\n");
230 sub_api_initialized = 1;
234 struct se_session *transport_init_session(void)
236 struct se_session *se_sess;
238 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
240 pr_err("Unable to allocate struct se_session from"
242 return ERR_PTR(-ENOMEM);
244 INIT_LIST_HEAD(&se_sess->sess_list);
245 INIT_LIST_HEAD(&se_sess->sess_acl_list);
246 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
247 INIT_LIST_HEAD(&se_sess->sess_wait_list);
248 spin_lock_init(&se_sess->sess_cmd_lock);
252 EXPORT_SYMBOL(transport_init_session);
255 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
257 void __transport_register_session(
258 struct se_portal_group *se_tpg,
259 struct se_node_acl *se_nacl,
260 struct se_session *se_sess,
261 void *fabric_sess_ptr)
263 unsigned char buf[PR_REG_ISID_LEN];
265 se_sess->se_tpg = se_tpg;
266 se_sess->fabric_sess_ptr = fabric_sess_ptr;
268 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
270 * Only set for struct se_session's that will actually be moving I/O.
271 * eg: *NOT* discovery sessions.
275 * If the fabric module supports an ISID based TransportID,
276 * save this value in binary from the fabric I_T Nexus now.
278 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
279 memset(&buf[0], 0, PR_REG_ISID_LEN);
280 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
281 &buf[0], PR_REG_ISID_LEN);
282 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
284 spin_lock_irq(&se_nacl->nacl_sess_lock);
286 * The se_nacl->nacl_sess pointer will be set to the
287 * last active I_T Nexus for each struct se_node_acl.
289 se_nacl->nacl_sess = se_sess;
291 list_add_tail(&se_sess->sess_acl_list,
292 &se_nacl->acl_sess_list);
293 spin_unlock_irq(&se_nacl->nacl_sess_lock);
295 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
297 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
298 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
300 EXPORT_SYMBOL(__transport_register_session);
302 void transport_register_session(
303 struct se_portal_group *se_tpg,
304 struct se_node_acl *se_nacl,
305 struct se_session *se_sess,
306 void *fabric_sess_ptr)
308 spin_lock_bh(&se_tpg->session_lock);
309 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
310 spin_unlock_bh(&se_tpg->session_lock);
312 EXPORT_SYMBOL(transport_register_session);
314 void transport_deregister_session_configfs(struct se_session *se_sess)
316 struct se_node_acl *se_nacl;
319 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
321 se_nacl = se_sess->se_node_acl;
323 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
324 list_del(&se_sess->sess_acl_list);
326 * If the session list is empty, then clear the pointer.
327 * Otherwise, set the struct se_session pointer from the tail
328 * element of the per struct se_node_acl active session list.
330 if (list_empty(&se_nacl->acl_sess_list))
331 se_nacl->nacl_sess = NULL;
333 se_nacl->nacl_sess = container_of(
334 se_nacl->acl_sess_list.prev,
335 struct se_session, sess_acl_list);
337 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
340 EXPORT_SYMBOL(transport_deregister_session_configfs);
342 void transport_free_session(struct se_session *se_sess)
344 kmem_cache_free(se_sess_cache, se_sess);
346 EXPORT_SYMBOL(transport_free_session);
348 void transport_deregister_session(struct se_session *se_sess)
350 struct se_portal_group *se_tpg = se_sess->se_tpg;
351 struct se_node_acl *se_nacl;
355 transport_free_session(se_sess);
359 spin_lock_irqsave(&se_tpg->session_lock, flags);
360 list_del(&se_sess->sess_list);
361 se_sess->se_tpg = NULL;
362 se_sess->fabric_sess_ptr = NULL;
363 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
366 * Determine if we need to do extra work for this initiator node's
367 * struct se_node_acl if it had been previously dynamically generated.
369 se_nacl = se_sess->se_node_acl;
371 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
372 if (se_nacl->dynamic_node_acl) {
373 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
375 list_del(&se_nacl->acl_list);
376 se_tpg->num_node_acls--;
377 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
379 core_tpg_wait_for_nacl_pr_ref(se_nacl);
380 core_free_device_list_for_node(se_nacl, se_tpg);
381 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
383 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
386 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
389 transport_free_session(se_sess);
391 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
392 se_tpg->se_tpg_tfo->get_fabric_name());
394 EXPORT_SYMBOL(transport_deregister_session);
397 * Called with cmd->t_state_lock held.
399 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
401 struct se_device *dev = cmd->se_dev;
402 struct se_task *task;
408 list_for_each_entry(task, &cmd->t_task_list, t_list) {
409 if (task->task_flags & TF_ACTIVE)
412 spin_lock_irqsave(&dev->execute_task_lock, flags);
413 if (task->t_state_active) {
414 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
415 cmd->se_tfo->get_task_tag(cmd), dev, task);
417 list_del(&task->t_state_list);
418 atomic_dec(&cmd->t_task_cdbs_ex_left);
419 task->t_state_active = false;
421 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
426 /* transport_cmd_check_stop():
428 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
429 * 'transport_off = 2' determines if task_dev_state should be removed.
431 * A non-zero u8 t_state sets cmd->t_state.
432 * Returns 1 when command is stopped, else 0.
434 static int transport_cmd_check_stop(
441 spin_lock_irqsave(&cmd->t_state_lock, flags);
443 * Determine if IOCTL context caller in requesting the stopping of this
444 * command for LUN shutdown purposes.
446 if (cmd->transport_state & CMD_T_LUN_STOP) {
447 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
448 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
450 cmd->transport_state &= ~CMD_T_ACTIVE;
451 if (transport_off == 2)
452 transport_all_task_dev_remove_state(cmd);
453 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
455 complete(&cmd->transport_lun_stop_comp);
459 * Determine if frontend context caller is requesting the stopping of
460 * this command for frontend exceptions.
462 if (cmd->transport_state & CMD_T_STOP) {
463 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
465 cmd->se_tfo->get_task_tag(cmd));
467 if (transport_off == 2)
468 transport_all_task_dev_remove_state(cmd);
471 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
474 if (transport_off == 2)
476 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
478 complete(&cmd->t_transport_stop_comp);
482 cmd->transport_state &= ~CMD_T_ACTIVE;
483 if (transport_off == 2) {
484 transport_all_task_dev_remove_state(cmd);
486 * Clear struct se_cmd->se_lun before the transport_off == 2
487 * handoff to fabric module.
491 * Some fabric modules like tcm_loop can release
492 * their internally allocated I/O reference now and
495 * Fabric modules are expected to return '1' here if the
496 * se_cmd being passed is released at this point,
497 * or zero if not being released.
499 if (cmd->se_tfo->check_stop_free != NULL) {
500 spin_unlock_irqrestore(
501 &cmd->t_state_lock, flags);
503 return cmd->se_tfo->check_stop_free(cmd);
506 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
510 cmd->t_state = t_state;
511 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
516 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
518 return transport_cmd_check_stop(cmd, 2, 0);
521 static void transport_lun_remove_cmd(struct se_cmd *cmd)
523 struct se_lun *lun = cmd->se_lun;
529 spin_lock_irqsave(&cmd->t_state_lock, flags);
530 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
531 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
532 transport_all_task_dev_remove_state(cmd);
534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
536 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
537 if (!list_empty(&cmd->se_lun_node))
538 list_del_init(&cmd->se_lun_node);
539 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
542 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
544 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
545 transport_lun_remove_cmd(cmd);
547 if (transport_cmd_check_stop_to_fabric(cmd))
550 transport_remove_cmd_from_queue(cmd);
551 transport_put_cmd(cmd);
555 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
558 struct se_device *dev = cmd->se_dev;
559 struct se_queue_obj *qobj = &dev->dev_queue_obj;
563 spin_lock_irqsave(&cmd->t_state_lock, flags);
564 cmd->t_state = t_state;
565 cmd->transport_state |= CMD_T_ACTIVE;
566 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
569 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
571 /* If the cmd is already on the list, remove it before we add it */
572 if (!list_empty(&cmd->se_queue_node))
573 list_del(&cmd->se_queue_node);
575 atomic_inc(&qobj->queue_cnt);
578 list_add(&cmd->se_queue_node, &qobj->qobj_list);
580 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
581 cmd->transport_state |= CMD_T_QUEUED;
582 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
584 wake_up_interruptible(&qobj->thread_wq);
587 static struct se_cmd *
588 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
593 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
594 if (list_empty(&qobj->qobj_list)) {
595 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
598 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
600 cmd->transport_state &= ~CMD_T_QUEUED;
601 list_del_init(&cmd->se_queue_node);
602 atomic_dec(&qobj->queue_cnt);
603 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
608 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
610 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
613 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
614 if (!(cmd->transport_state & CMD_T_QUEUED)) {
615 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
618 cmd->transport_state &= ~CMD_T_QUEUED;
619 atomic_dec(&qobj->queue_cnt);
620 list_del_init(&cmd->se_queue_node);
621 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
625 * Completion function used by TCM subsystem plugins (such as FILEIO)
626 * for queueing up response from struct se_subsystem_api->do_task()
628 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
630 struct se_task *task = list_entry(cmd->t_task_list.next,
631 struct se_task, t_list);
634 cmd->scsi_status = SAM_STAT_GOOD;
635 task->task_scsi_status = GOOD;
637 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
638 task->task_se_cmd->scsi_sense_reason =
639 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
643 transport_complete_task(task, good);
645 EXPORT_SYMBOL(transport_complete_sync_cache);
647 static void target_complete_failure_work(struct work_struct *work)
649 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
651 transport_generic_request_failure(cmd);
654 /* transport_complete_task():
656 * Called from interrupt and non interrupt context depending
657 * on the transport plugin.
659 void transport_complete_task(struct se_task *task, int success)
661 struct se_cmd *cmd = task->task_se_cmd;
662 struct se_device *dev = cmd->se_dev;
665 spin_lock_irqsave(&cmd->t_state_lock, flags);
666 task->task_flags &= ~TF_ACTIVE;
669 * See if any sense data exists, if so set the TASK_SENSE flag.
670 * Also check for any other post completion work that needs to be
671 * done by the plugins.
673 if (dev && dev->transport->transport_complete) {
674 if (dev->transport->transport_complete(task) != 0) {
675 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
676 task->task_flags |= TF_HAS_SENSE;
682 * See if we are waiting for outstanding struct se_task
683 * to complete for an exception condition
685 if (task->task_flags & TF_REQUEST_STOP) {
686 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
687 complete(&task->task_stop_comp);
692 cmd->transport_state |= CMD_T_FAILED;
695 * Decrement the outstanding t_task_cdbs_left count. The last
696 * struct se_task from struct se_cmd will complete itself into the
697 * device queue depending upon int success.
699 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
700 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
704 if (cmd->transport_state & CMD_T_FAILED) {
705 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
706 INIT_WORK(&cmd->work, target_complete_failure_work);
708 cmd->transport_state |= CMD_T_COMPLETE;
709 INIT_WORK(&cmd->work, target_complete_ok_work);
712 cmd->t_state = TRANSPORT_COMPLETE;
713 cmd->transport_state |= CMD_T_ACTIVE;
714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
716 queue_work(target_completion_wq, &cmd->work);
718 EXPORT_SYMBOL(transport_complete_task);
721 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
722 * struct se_task list are ready to be added to the active execution list
725 * Called with se_dev_t->execute_task_lock called.
727 static inline int transport_add_task_check_sam_attr(
728 struct se_task *task,
729 struct se_task *task_prev,
730 struct se_device *dev)
733 * No SAM Task attribute emulation enabled, add to tail of
736 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
737 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
741 * HEAD_OF_QUEUE attribute for received CDB, which means
742 * the first task that is associated with a struct se_cmd goes to
743 * head of the struct se_device->execute_task_list, and task_prev
744 * after that for each subsequent task
746 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
747 list_add(&task->t_execute_list,
748 (task_prev != NULL) ?
749 &task_prev->t_execute_list :
750 &dev->execute_task_list);
752 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
753 " in execution queue\n",
754 task->task_se_cmd->t_task_cdb[0]);
758 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
759 * transitioned from Dermant -> Active state, and are added to the end
760 * of the struct se_device->execute_task_list
762 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
766 /* __transport_add_task_to_execute_queue():
768 * Called with se_dev_t->execute_task_lock called.
770 static void __transport_add_task_to_execute_queue(
771 struct se_task *task,
772 struct se_task *task_prev,
773 struct se_device *dev)
777 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
778 atomic_inc(&dev->execute_tasks);
780 if (task->t_state_active)
783 * Determine if this task needs to go to HEAD_OF_QUEUE for the
784 * state list as well. Running with SAM Task Attribute emulation
785 * will always return head_of_queue == 0 here
788 list_add(&task->t_state_list, (task_prev) ?
789 &task_prev->t_state_list :
790 &dev->state_task_list);
792 list_add_tail(&task->t_state_list, &dev->state_task_list);
794 task->t_state_active = true;
796 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
797 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
801 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
803 struct se_device *dev = cmd->se_dev;
804 struct se_task *task;
807 spin_lock_irqsave(&cmd->t_state_lock, flags);
808 list_for_each_entry(task, &cmd->t_task_list, t_list) {
809 spin_lock(&dev->execute_task_lock);
810 if (!task->t_state_active) {
811 list_add_tail(&task->t_state_list,
812 &dev->state_task_list);
813 task->t_state_active = true;
815 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
816 task->task_se_cmd->se_tfo->get_task_tag(
817 task->task_se_cmd), task, dev);
819 spin_unlock(&dev->execute_task_lock);
821 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
824 static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
826 struct se_device *dev = cmd->se_dev;
827 struct se_task *task, *task_prev = NULL;
829 list_for_each_entry(task, &cmd->t_task_list, t_list) {
830 if (!list_empty(&task->t_execute_list))
833 * __transport_add_task_to_execute_queue() handles the
834 * SAM Task Attribute emulation if enabled
836 __transport_add_task_to_execute_queue(task, task_prev, dev);
841 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
844 struct se_device *dev = cmd->se_dev;
846 spin_lock_irqsave(&dev->execute_task_lock, flags);
847 __transport_add_tasks_from_cmd(cmd);
848 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
851 void __transport_remove_task_from_execute_queue(struct se_task *task,
852 struct se_device *dev)
854 list_del_init(&task->t_execute_list);
855 atomic_dec(&dev->execute_tasks);
858 static void transport_remove_task_from_execute_queue(
859 struct se_task *task,
860 struct se_device *dev)
864 if (WARN_ON(list_empty(&task->t_execute_list)))
867 spin_lock_irqsave(&dev->execute_task_lock, flags);
868 __transport_remove_task_from_execute_queue(task, dev);
869 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
873 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
876 static void target_qf_do_work(struct work_struct *work)
878 struct se_device *dev = container_of(work, struct se_device,
880 LIST_HEAD(qf_cmd_list);
881 struct se_cmd *cmd, *cmd_tmp;
883 spin_lock_irq(&dev->qf_cmd_lock);
884 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
885 spin_unlock_irq(&dev->qf_cmd_lock);
887 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
888 list_del(&cmd->se_qf_node);
889 atomic_dec(&dev->dev_qf_count);
890 smp_mb__after_atomic_dec();
892 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
893 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
894 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
895 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
898 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
902 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
904 switch (cmd->data_direction) {
907 case DMA_FROM_DEVICE:
911 case DMA_BIDIRECTIONAL:
920 void transport_dump_dev_state(
921 struct se_device *dev,
925 *bl += sprintf(b + *bl, "Status: ");
926 switch (dev->dev_status) {
927 case TRANSPORT_DEVICE_ACTIVATED:
928 *bl += sprintf(b + *bl, "ACTIVATED");
930 case TRANSPORT_DEVICE_DEACTIVATED:
931 *bl += sprintf(b + *bl, "DEACTIVATED");
933 case TRANSPORT_DEVICE_SHUTDOWN:
934 *bl += sprintf(b + *bl, "SHUTDOWN");
936 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
937 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
938 *bl += sprintf(b + *bl, "OFFLINE");
941 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
945 *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
946 atomic_read(&dev->execute_tasks), dev->queue_depth);
947 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
948 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
949 *bl += sprintf(b + *bl, " ");
952 void transport_dump_vpd_proto_id(
954 unsigned char *p_buf,
957 unsigned char buf[VPD_TMP_BUF_SIZE];
960 memset(buf, 0, VPD_TMP_BUF_SIZE);
961 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
963 switch (vpd->protocol_identifier) {
965 sprintf(buf+len, "Fibre Channel\n");
968 sprintf(buf+len, "Parallel SCSI\n");
971 sprintf(buf+len, "SSA\n");
974 sprintf(buf+len, "IEEE 1394\n");
977 sprintf(buf+len, "SCSI Remote Direct Memory Access"
981 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
984 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
987 sprintf(buf+len, "Automation/Drive Interface Transport"
991 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
994 sprintf(buf+len, "Unknown 0x%02x\n",
995 vpd->protocol_identifier);
1000 strncpy(p_buf, buf, p_buf_len);
1002 pr_debug("%s", buf);
1006 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1009 * Check if the Protocol Identifier Valid (PIV) bit is set..
1011 * from spc3r23.pdf section 7.5.1
1013 if (page_83[1] & 0x80) {
1014 vpd->protocol_identifier = (page_83[0] & 0xf0);
1015 vpd->protocol_identifier_set = 1;
1016 transport_dump_vpd_proto_id(vpd, NULL, 0);
1019 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1021 int transport_dump_vpd_assoc(
1022 struct t10_vpd *vpd,
1023 unsigned char *p_buf,
1026 unsigned char buf[VPD_TMP_BUF_SIZE];
1030 memset(buf, 0, VPD_TMP_BUF_SIZE);
1031 len = sprintf(buf, "T10 VPD Identifier Association: ");
1033 switch (vpd->association) {
1035 sprintf(buf+len, "addressed logical unit\n");
1038 sprintf(buf+len, "target port\n");
1041 sprintf(buf+len, "SCSI target device\n");
1044 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1050 strncpy(p_buf, buf, p_buf_len);
1052 pr_debug("%s", buf);
1057 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1060 * The VPD identification association..
1062 * from spc3r23.pdf Section 7.6.3.1 Table 297
1064 vpd->association = (page_83[1] & 0x30);
1065 return transport_dump_vpd_assoc(vpd, NULL, 0);
1067 EXPORT_SYMBOL(transport_set_vpd_assoc);
1069 int transport_dump_vpd_ident_type(
1070 struct t10_vpd *vpd,
1071 unsigned char *p_buf,
1074 unsigned char buf[VPD_TMP_BUF_SIZE];
1078 memset(buf, 0, VPD_TMP_BUF_SIZE);
1079 len = sprintf(buf, "T10 VPD Identifier Type: ");
1081 switch (vpd->device_identifier_type) {
1083 sprintf(buf+len, "Vendor specific\n");
1086 sprintf(buf+len, "T10 Vendor ID based\n");
1089 sprintf(buf+len, "EUI-64 based\n");
1092 sprintf(buf+len, "NAA\n");
1095 sprintf(buf+len, "Relative target port identifier\n");
1098 sprintf(buf+len, "SCSI name string\n");
1101 sprintf(buf+len, "Unsupported: 0x%02x\n",
1102 vpd->device_identifier_type);
1108 if (p_buf_len < strlen(buf)+1)
1110 strncpy(p_buf, buf, p_buf_len);
1112 pr_debug("%s", buf);
1118 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1121 * The VPD identifier type..
1123 * from spc3r23.pdf Section 7.6.3.1 Table 298
1125 vpd->device_identifier_type = (page_83[1] & 0x0f);
1126 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1128 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1130 int transport_dump_vpd_ident(
1131 struct t10_vpd *vpd,
1132 unsigned char *p_buf,
1135 unsigned char buf[VPD_TMP_BUF_SIZE];
1138 memset(buf, 0, VPD_TMP_BUF_SIZE);
1140 switch (vpd->device_identifier_code_set) {
1141 case 0x01: /* Binary */
1142 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1143 &vpd->device_identifier[0]);
1145 case 0x02: /* ASCII */
1146 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1147 &vpd->device_identifier[0]);
1149 case 0x03: /* UTF-8 */
1150 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1151 &vpd->device_identifier[0]);
1154 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1155 " 0x%02x", vpd->device_identifier_code_set);
1161 strncpy(p_buf, buf, p_buf_len);
1163 pr_debug("%s", buf);
1169 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1171 static const char hex_str[] = "0123456789abcdef";
1172 int j = 0, i = 4; /* offset to start of the identifer */
1175 * The VPD Code Set (encoding)
1177 * from spc3r23.pdf Section 7.6.3.1 Table 296
1179 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1180 switch (vpd->device_identifier_code_set) {
1181 case 0x01: /* Binary */
1182 vpd->device_identifier[j++] =
1183 hex_str[vpd->device_identifier_type];
1184 while (i < (4 + page_83[3])) {
1185 vpd->device_identifier[j++] =
1186 hex_str[(page_83[i] & 0xf0) >> 4];
1187 vpd->device_identifier[j++] =
1188 hex_str[page_83[i] & 0x0f];
1192 case 0x02: /* ASCII */
1193 case 0x03: /* UTF-8 */
1194 while (i < (4 + page_83[3]))
1195 vpd->device_identifier[j++] = page_83[i++];
1201 return transport_dump_vpd_ident(vpd, NULL, 0);
1203 EXPORT_SYMBOL(transport_set_vpd_ident);
1205 static void core_setup_task_attr_emulation(struct se_device *dev)
1208 * If this device is from Target_Core_Mod/pSCSI, disable the
1209 * SAM Task Attribute emulation.
1211 * This is currently not available in upsream Linux/SCSI Target
1212 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1214 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1215 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1219 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1220 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1221 " device\n", dev->transport->name,
1222 dev->transport->get_device_rev(dev));
1225 static void scsi_dump_inquiry(struct se_device *dev)
1227 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1231 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1233 for (i = 0; i < 8; i++)
1234 if (wwn->vendor[i] >= 0x20)
1235 buf[i] = wwn->vendor[i];
1239 pr_debug(" Vendor: %s\n", buf);
1241 for (i = 0; i < 16; i++)
1242 if (wwn->model[i] >= 0x20)
1243 buf[i] = wwn->model[i];
1247 pr_debug(" Model: %s\n", buf);
1249 for (i = 0; i < 4; i++)
1250 if (wwn->revision[i] >= 0x20)
1251 buf[i] = wwn->revision[i];
1255 pr_debug(" Revision: %s\n", buf);
1257 device_type = dev->transport->get_device_type(dev);
1258 pr_debug(" Type: %s ", scsi_device_type(device_type));
1259 pr_debug(" ANSI SCSI revision: %02x\n",
1260 dev->transport->get_device_rev(dev));
1263 struct se_device *transport_add_device_to_core_hba(
1265 struct se_subsystem_api *transport,
1266 struct se_subsystem_dev *se_dev,
1268 void *transport_dev,
1269 struct se_dev_limits *dev_limits,
1270 const char *inquiry_prod,
1271 const char *inquiry_rev)
1274 struct se_device *dev;
1276 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1278 pr_err("Unable to allocate memory for se_dev_t\n");
1282 transport_init_queue_obj(&dev->dev_queue_obj);
1283 dev->dev_flags = device_flags;
1284 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1285 dev->dev_ptr = transport_dev;
1287 dev->se_sub_dev = se_dev;
1288 dev->transport = transport;
1289 INIT_LIST_HEAD(&dev->dev_list);
1290 INIT_LIST_HEAD(&dev->dev_sep_list);
1291 INIT_LIST_HEAD(&dev->dev_tmr_list);
1292 INIT_LIST_HEAD(&dev->execute_task_list);
1293 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1294 INIT_LIST_HEAD(&dev->state_task_list);
1295 INIT_LIST_HEAD(&dev->qf_cmd_list);
1296 spin_lock_init(&dev->execute_task_lock);
1297 spin_lock_init(&dev->delayed_cmd_lock);
1298 spin_lock_init(&dev->dev_reservation_lock);
1299 spin_lock_init(&dev->dev_status_lock);
1300 spin_lock_init(&dev->se_port_lock);
1301 spin_lock_init(&dev->se_tmr_lock);
1302 spin_lock_init(&dev->qf_cmd_lock);
1303 atomic_set(&dev->dev_ordered_id, 0);
1305 se_dev_set_default_attribs(dev, dev_limits);
1307 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1308 dev->creation_time = get_jiffies_64();
1309 spin_lock_init(&dev->stats_lock);
1311 spin_lock(&hba->device_lock);
1312 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1314 spin_unlock(&hba->device_lock);
1316 * Setup the SAM Task Attribute emulation for struct se_device
1318 core_setup_task_attr_emulation(dev);
1320 * Force PR and ALUA passthrough emulation with internal object use.
1322 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1324 * Setup the Reservations infrastructure for struct se_device
1326 core_setup_reservations(dev, force_pt);
1328 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1330 if (core_setup_alua(dev, force_pt) < 0)
1334 * Startup the struct se_device processing thread
1336 dev->process_thread = kthread_run(transport_processing_thread, dev,
1337 "LIO_%s", dev->transport->name);
1338 if (IS_ERR(dev->process_thread)) {
1339 pr_err("Unable to create kthread: LIO_%s\n",
1340 dev->transport->name);
1344 * Setup work_queue for QUEUE_FULL
1346 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1348 * Preload the initial INQUIRY const values if we are doing
1349 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1350 * passthrough because this is being provided by the backend LLD.
1351 * This is required so that transport_get_inquiry() copies these
1352 * originals once back into DEV_T10_WWN(dev) for the virtual device
1355 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1356 if (!inquiry_prod || !inquiry_rev) {
1357 pr_err("All non TCM/pSCSI plugins require"
1358 " INQUIRY consts\n");
1362 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1363 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1364 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1366 scsi_dump_inquiry(dev);
1370 kthread_stop(dev->process_thread);
1372 spin_lock(&hba->device_lock);
1373 list_del(&dev->dev_list);
1375 spin_unlock(&hba->device_lock);
1377 se_release_vpd_for_dev(dev);
1383 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1385 /* transport_generic_prepare_cdb():
1387 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1388 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1389 * The point of this is since we are mapping iSCSI LUNs to
1390 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1391 * devices and HBAs for a loop.
1393 static inline void transport_generic_prepare_cdb(
1397 case READ_10: /* SBC - RDProtect */
1398 case READ_12: /* SBC - RDProtect */
1399 case READ_16: /* SBC - RDProtect */
1400 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1401 case VERIFY: /* SBC - VRProtect */
1402 case VERIFY_16: /* SBC - VRProtect */
1403 case WRITE_VERIFY: /* SBC - VRProtect */
1404 case WRITE_VERIFY_12: /* SBC - VRProtect */
1407 cdb[1] &= 0x1f; /* clear logical unit number */
1412 static struct se_task *
1413 transport_generic_get_task(struct se_cmd *cmd,
1414 enum dma_data_direction data_direction)
1416 struct se_task *task;
1417 struct se_device *dev = cmd->se_dev;
1419 task = dev->transport->alloc_task(cmd->t_task_cdb);
1421 pr_err("Unable to allocate struct se_task\n");
1425 INIT_LIST_HEAD(&task->t_list);
1426 INIT_LIST_HEAD(&task->t_execute_list);
1427 INIT_LIST_HEAD(&task->t_state_list);
1428 init_completion(&task->task_stop_comp);
1429 task->task_se_cmd = cmd;
1430 task->task_data_direction = data_direction;
1435 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1438 * Used by fabric modules containing a local struct se_cmd within their
1439 * fabric dependent per I/O descriptor.
1441 void transport_init_se_cmd(
1443 struct target_core_fabric_ops *tfo,
1444 struct se_session *se_sess,
1448 unsigned char *sense_buffer)
1450 INIT_LIST_HEAD(&cmd->se_lun_node);
1451 INIT_LIST_HEAD(&cmd->se_delayed_node);
1452 INIT_LIST_HEAD(&cmd->se_qf_node);
1453 INIT_LIST_HEAD(&cmd->se_queue_node);
1454 INIT_LIST_HEAD(&cmd->se_cmd_list);
1455 INIT_LIST_HEAD(&cmd->t_task_list);
1456 init_completion(&cmd->transport_lun_fe_stop_comp);
1457 init_completion(&cmd->transport_lun_stop_comp);
1458 init_completion(&cmd->t_transport_stop_comp);
1459 init_completion(&cmd->cmd_wait_comp);
1460 spin_lock_init(&cmd->t_state_lock);
1461 cmd->transport_state = CMD_T_DEV_ACTIVE;
1464 cmd->se_sess = se_sess;
1465 cmd->data_length = data_length;
1466 cmd->data_direction = data_direction;
1467 cmd->sam_task_attr = task_attr;
1468 cmd->sense_buffer = sense_buffer;
1470 EXPORT_SYMBOL(transport_init_se_cmd);
1472 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1475 * Check if SAM Task Attribute emulation is enabled for this
1476 * struct se_device storage object
1478 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1481 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1482 pr_debug("SAM Task Attribute ACA"
1483 " emulation is not supported\n");
1487 * Used to determine when ORDERED commands should go from
1488 * Dormant to Active status.
1490 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1491 smp_mb__after_atomic_inc();
1492 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1493 cmd->se_ordered_id, cmd->sam_task_attr,
1494 cmd->se_dev->transport->name);
1498 /* transport_generic_allocate_tasks():
1500 * Called from fabric RX Thread.
1502 int transport_generic_allocate_tasks(
1508 transport_generic_prepare_cdb(cdb);
1510 * Ensure that the received CDB is less than the max (252 + 8) bytes
1511 * for VARIABLE_LENGTH_CMD
1513 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1514 pr_err("Received SCSI CDB with command_size: %d that"
1515 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1516 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1517 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1518 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1522 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1523 * allocate the additional extended CDB buffer now.. Otherwise
1524 * setup the pointer from __t_task_cdb to t_task_cdb.
1526 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1527 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1529 if (!cmd->t_task_cdb) {
1530 pr_err("Unable to allocate cmd->t_task_cdb"
1531 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1532 scsi_command_size(cdb),
1533 (unsigned long)sizeof(cmd->__t_task_cdb));
1534 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1535 cmd->scsi_sense_reason =
1536 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1540 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1542 * Copy the original CDB into cmd->
1544 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1546 * Setup the received CDB based on SCSI defined opcodes and
1547 * perform unit attention, persistent reservations and ALUA
1548 * checks for virtual device backends. The cmd->t_task_cdb
1549 * pointer is expected to be setup before we reach this point.
1551 ret = transport_generic_cmd_sequencer(cmd, cdb);
1555 * Check for SAM Task Attribute Emulation
1557 if (transport_check_alloc_task_attr(cmd) < 0) {
1558 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1559 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1562 spin_lock(&cmd->se_lun->lun_sep_lock);
1563 if (cmd->se_lun->lun_sep)
1564 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1565 spin_unlock(&cmd->se_lun->lun_sep_lock);
1568 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1571 * Used by fabric module frontends to queue tasks directly.
1572 * Many only be used from process context only
1574 int transport_handle_cdb_direct(
1581 pr_err("cmd->se_lun is NULL\n");
1584 if (in_interrupt()) {
1586 pr_err("transport_generic_handle_cdb cannot be called"
1587 " from interrupt context\n");
1591 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1592 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1593 * in existing usage to ensure that outstanding descriptors are handled
1594 * correctly during shutdown via transport_wait_for_tasks()
1596 * Also, we don't take cmd->t_state_lock here as we only expect
1597 * this to be called for initial descriptor submission.
1599 cmd->t_state = TRANSPORT_NEW_CMD;
1600 cmd->transport_state |= CMD_T_ACTIVE;
1603 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1604 * so follow TRANSPORT_NEW_CMD processing thread context usage
1605 * and call transport_generic_request_failure() if necessary..
1607 ret = transport_generic_new_cmd(cmd);
1609 transport_generic_request_failure(cmd);
1613 EXPORT_SYMBOL(transport_handle_cdb_direct);
1616 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1618 * @se_cmd: command descriptor to submit
1619 * @se_sess: associated se_sess for endpoint
1620 * @cdb: pointer to SCSI CDB
1621 * @sense: pointer to SCSI sense buffer
1622 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1623 * @data_length: fabric expected data transfer length
1624 * @task_addr: SAM task attribute
1625 * @data_dir: DMA data direction
1626 * @flags: flags for command submission from target_sc_flags_tables
1628 * This may only be called from process context, and also currently
1629 * assumes internal allocation of fabric payload buffer by target-core.
1631 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1632 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1633 u32 data_length, int task_attr, int data_dir, int flags)
1635 struct se_portal_group *se_tpg;
1638 se_tpg = se_sess->se_tpg;
1640 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1641 BUG_ON(in_interrupt());
1643 * Initialize se_cmd for target operation. From this point
1644 * exceptions are handled by sending exception status via
1645 * target_core_fabric_ops->queue_status() callback
1647 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1648 data_length, data_dir, task_attr, sense);
1650 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1651 * se_sess->sess_cmd_list. A second kref_get here is necessary
1652 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1653 * kref_put() to happen during fabric packet acknowledgement.
1655 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1657 * Signal bidirectional data payloads to target-core
1659 if (flags & TARGET_SCF_BIDI_OP)
1660 se_cmd->se_cmd_flags |= SCF_BIDI;
1662 * Locate se_lun pointer and attach it to struct se_cmd
1664 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1665 transport_send_check_condition_and_sense(se_cmd,
1666 se_cmd->scsi_sense_reason, 0);
1667 target_put_sess_cmd(se_sess, se_cmd);
1671 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1672 * allocate the necessary tasks to complete the received CDB+data
1674 rc = transport_generic_allocate_tasks(se_cmd, cdb);
1676 transport_generic_request_failure(se_cmd);
1680 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1681 * for immediate execution of READs, otherwise wait for
1682 * transport_generic_handle_data() to be called for WRITEs
1683 * when fabric has filled the incoming buffer.
1685 transport_handle_cdb_direct(se_cmd);
1688 EXPORT_SYMBOL(target_submit_cmd);
1691 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1694 * @se_cmd: command descriptor to submit
1695 * @se_sess: associated se_sess for endpoint
1696 * @sense: pointer to SCSI sense buffer
1697 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1698 * @fabric_context: fabric context for TMR req
1699 * @tm_type: Type of TM request
1701 * Callable from all contexts.
1704 void target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1705 unsigned char *sense, u32 unpacked_lun,
1706 void *fabric_tmr_ptr, unsigned char tm_type, int flags)
1708 struct se_portal_group *se_tpg;
1711 se_tpg = se_sess->se_tpg;
1714 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1715 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1717 /* See target_submit_cmd for commentary */
1718 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1720 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, GFP_KERNEL);
1727 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1729 transport_send_check_condition_and_sense(se_cmd,
1730 se_cmd->scsi_sense_reason, 0);
1731 transport_generic_free_cmd(se_cmd, 0);
1734 transport_generic_handle_tmr(se_cmd);
1736 EXPORT_SYMBOL(target_submit_tmr);
1739 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1740 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1741 * complete setup in TCM process context w/ TFO->new_cmd_map().
1743 int transport_generic_handle_cdb_map(
1748 pr_err("cmd->se_lun is NULL\n");
1752 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1755 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1757 /* transport_generic_handle_data():
1761 int transport_generic_handle_data(
1765 * For the software fabric case, then we assume the nexus is being
1766 * failed/shutdown when signals are pending from the kthread context
1767 * caller, so we return a failure. For the HW target mode case running
1768 * in interrupt code, the signal_pending() check is skipped.
1770 if (!in_interrupt() && signal_pending(current))
1773 * If the received CDB has aleady been ABORTED by the generic
1774 * target engine, we now call transport_check_aborted_status()
1775 * to queue any delated TASK_ABORTED status for the received CDB to the
1776 * fabric module as we are expecting no further incoming DATA OUT
1777 * sequences at this point.
1779 if (transport_check_aborted_status(cmd, 1) != 0)
1782 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1785 EXPORT_SYMBOL(transport_generic_handle_data);
1787 /* transport_generic_handle_tmr():
1791 int transport_generic_handle_tmr(
1794 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1797 EXPORT_SYMBOL(transport_generic_handle_tmr);
1800 * If the task is active, request it to be stopped and sleep until it
1803 bool target_stop_task(struct se_task *task, unsigned long *flags)
1805 struct se_cmd *cmd = task->task_se_cmd;
1806 bool was_active = false;
1808 if (task->task_flags & TF_ACTIVE) {
1809 task->task_flags |= TF_REQUEST_STOP;
1810 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1812 pr_debug("Task %p waiting to complete\n", task);
1813 wait_for_completion(&task->task_stop_comp);
1814 pr_debug("Task %p stopped successfully\n", task);
1816 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1817 atomic_dec(&cmd->t_task_cdbs_left);
1818 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1825 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1827 struct se_task *task, *task_tmp;
1828 unsigned long flags;
1831 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1832 cmd->se_tfo->get_task_tag(cmd));
1835 * No tasks remain in the execution queue
1837 spin_lock_irqsave(&cmd->t_state_lock, flags);
1838 list_for_each_entry_safe(task, task_tmp,
1839 &cmd->t_task_list, t_list) {
1840 pr_debug("Processing task %p\n", task);
1842 * If the struct se_task has not been sent and is not active,
1843 * remove the struct se_task from the execution queue.
1845 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1846 spin_unlock_irqrestore(&cmd->t_state_lock,
1848 transport_remove_task_from_execute_queue(task,
1851 pr_debug("Task %p removed from execute queue\n", task);
1852 spin_lock_irqsave(&cmd->t_state_lock, flags);
1856 if (!target_stop_task(task, &flags)) {
1857 pr_debug("Task %p - did nothing\n", task);
1861 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1867 * Handle SAM-esque emulation for generic transport request failures.
1869 static void transport_generic_request_failure(struct se_cmd *cmd)
1873 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1874 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1875 cmd->t_task_cdb[0]);
1876 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1877 cmd->se_tfo->get_cmd_state(cmd),
1878 cmd->t_state, cmd->scsi_sense_reason);
1879 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1880 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1881 " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1882 cmd->t_task_list_num,
1883 atomic_read(&cmd->t_task_cdbs_left),
1884 atomic_read(&cmd->t_task_cdbs_sent),
1885 atomic_read(&cmd->t_task_cdbs_ex_left),
1886 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1887 (cmd->transport_state & CMD_T_STOP) != 0,
1888 (cmd->transport_state & CMD_T_SENT) != 0);
1891 * For SAM Task Attribute emulation for failed struct se_cmd
1893 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1894 transport_complete_task_attr(cmd);
1896 switch (cmd->scsi_sense_reason) {
1897 case TCM_NON_EXISTENT_LUN:
1898 case TCM_UNSUPPORTED_SCSI_OPCODE:
1899 case TCM_INVALID_CDB_FIELD:
1900 case TCM_INVALID_PARAMETER_LIST:
1901 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1902 case TCM_UNKNOWN_MODE_PAGE:
1903 case TCM_WRITE_PROTECTED:
1904 case TCM_CHECK_CONDITION_ABORT_CMD:
1905 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1906 case TCM_CHECK_CONDITION_NOT_READY:
1908 case TCM_RESERVATION_CONFLICT:
1910 * No SENSE Data payload for this case, set SCSI Status
1911 * and queue the response to $FABRIC_MOD.
1913 * Uses linux/include/scsi/scsi.h SAM status codes defs
1915 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1917 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1918 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1921 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1924 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1925 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1926 cmd->orig_fe_lun, 0x2C,
1927 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1929 ret = cmd->se_tfo->queue_status(cmd);
1930 if (ret == -EAGAIN || ret == -ENOMEM)
1934 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1935 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1936 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1940 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1941 * make the call to transport_send_check_condition_and_sense()
1942 * directly. Otherwise expect the fabric to make the call to
1943 * transport_send_check_condition_and_sense() after handling
1944 * possible unsoliticied write data payloads.
1946 ret = transport_send_check_condition_and_sense(cmd,
1947 cmd->scsi_sense_reason, 0);
1948 if (ret == -EAGAIN || ret == -ENOMEM)
1952 transport_lun_remove_cmd(cmd);
1953 if (!transport_cmd_check_stop_to_fabric(cmd))
1958 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1959 transport_handle_queue_full(cmd, cmd->se_dev);
1962 static inline u32 transport_lba_21(unsigned char *cdb)
1964 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1967 static inline u32 transport_lba_32(unsigned char *cdb)
1969 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1972 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1974 unsigned int __v1, __v2;
1976 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1977 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1979 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1983 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1985 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1987 unsigned int __v1, __v2;
1989 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1990 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1992 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1995 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1997 unsigned long flags;
1999 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2000 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2001 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2005 * Called from Fabric Module context from transport_execute_tasks()
2007 * The return of this function determins if the tasks from struct se_cmd
2008 * get added to the execution queue in transport_execute_tasks(),
2009 * or are added to the delayed or ordered lists here.
2011 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2013 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2016 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2017 * to allow the passed struct se_cmd list of tasks to the front of the list.
2019 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2020 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2021 " 0x%02x, se_ordered_id: %u\n",
2023 cmd->se_ordered_id);
2025 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2026 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2027 smp_mb__after_atomic_inc();
2029 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2030 " list, se_ordered_id: %u\n",
2032 cmd->se_ordered_id);
2034 * Add ORDERED command to tail of execution queue if
2035 * no other older commands exist that need to be
2038 if (!atomic_read(&cmd->se_dev->simple_cmds))
2042 * For SIMPLE and UNTAGGED Task Attribute commands
2044 atomic_inc(&cmd->se_dev->simple_cmds);
2045 smp_mb__after_atomic_inc();
2048 * Otherwise if one or more outstanding ORDERED task attribute exist,
2049 * add the dormant task(s) built for the passed struct se_cmd to the
2050 * execution queue and become in Active state for this struct se_device.
2052 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2054 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2055 * will be drained upon completion of HEAD_OF_QUEUE task.
2057 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2058 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2059 list_add_tail(&cmd->se_delayed_node,
2060 &cmd->se_dev->delayed_cmd_list);
2061 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2063 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2064 " delayed CMD list, se_ordered_id: %u\n",
2065 cmd->t_task_cdb[0], cmd->sam_task_attr,
2066 cmd->se_ordered_id);
2068 * Return zero to let transport_execute_tasks() know
2069 * not to add the delayed tasks to the execution list.
2074 * Otherwise, no ORDERED task attributes exist..
2080 * Called from fabric module context in transport_generic_new_cmd() and
2081 * transport_generic_process_write()
2083 static int transport_execute_tasks(struct se_cmd *cmd)
2086 struct se_device *se_dev = cmd->se_dev;
2088 * Call transport_cmd_check_stop() to see if a fabric exception
2089 * has occurred that prevents execution.
2091 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2093 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2094 * attribute for the tasks of the received struct se_cmd CDB
2096 add_tasks = transport_execute_task_attr(cmd);
2100 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2101 * adds associated se_tasks while holding dev->execute_task_lock
2102 * before I/O dispath to avoid a double spinlock access.
2104 __transport_execute_tasks(se_dev, cmd);
2109 __transport_execute_tasks(se_dev, NULL);
2114 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2115 * from struct se_device->execute_task_list and
2117 * Called from transport_processing_thread()
2119 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
2122 struct se_cmd *cmd = NULL;
2123 struct se_task *task = NULL;
2124 unsigned long flags;
2127 spin_lock_irq(&dev->execute_task_lock);
2128 if (new_cmd != NULL)
2129 __transport_add_tasks_from_cmd(new_cmd);
2131 if (list_empty(&dev->execute_task_list)) {
2132 spin_unlock_irq(&dev->execute_task_lock);
2135 task = list_first_entry(&dev->execute_task_list,
2136 struct se_task, t_execute_list);
2137 __transport_remove_task_from_execute_queue(task, dev);
2138 spin_unlock_irq(&dev->execute_task_lock);
2140 cmd = task->task_se_cmd;
2141 spin_lock_irqsave(&cmd->t_state_lock, flags);
2142 task->task_flags |= (TF_ACTIVE | TF_SENT);
2143 atomic_inc(&cmd->t_task_cdbs_sent);
2145 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2146 cmd->t_task_list_num)
2147 cmd->transport_state |= CMD_T_SENT;
2149 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2151 if (cmd->execute_task)
2152 error = cmd->execute_task(task);
2154 error = dev->transport->do_task(task);
2156 spin_lock_irqsave(&cmd->t_state_lock, flags);
2157 task->task_flags &= ~TF_ACTIVE;
2158 cmd->transport_state &= ~CMD_T_SENT;
2159 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2161 transport_stop_tasks_for_cmd(cmd);
2162 transport_generic_request_failure(cmd);
2171 static inline u32 transport_get_sectors_6(
2176 struct se_device *dev = cmd->se_dev;
2179 * Assume TYPE_DISK for non struct se_device objects.
2180 * Use 8-bit sector value.
2186 * Use 24-bit allocation length for TYPE_TAPE.
2188 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2189 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2192 * Everything else assume TYPE_DISK Sector CDB location.
2193 * Use 8-bit sector value. SBC-3 says:
2195 * A TRANSFER LENGTH field set to zero specifies that 256
2196 * logical blocks shall be written. Any other value
2197 * specifies the number of logical blocks that shall be
2201 return cdb[4] ? : 256;
2204 static inline u32 transport_get_sectors_10(
2209 struct se_device *dev = cmd->se_dev;
2212 * Assume TYPE_DISK for non struct se_device objects.
2213 * Use 16-bit sector value.
2219 * XXX_10 is not defined in SSC, throw an exception
2221 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2227 * Everything else assume TYPE_DISK Sector CDB location.
2228 * Use 16-bit sector value.
2231 return (u32)(cdb[7] << 8) + cdb[8];
2234 static inline u32 transport_get_sectors_12(
2239 struct se_device *dev = cmd->se_dev;
2242 * Assume TYPE_DISK for non struct se_device objects.
2243 * Use 32-bit sector value.
2249 * XXX_12 is not defined in SSC, throw an exception
2251 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2257 * Everything else assume TYPE_DISK Sector CDB location.
2258 * Use 32-bit sector value.
2261 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2264 static inline u32 transport_get_sectors_16(
2269 struct se_device *dev = cmd->se_dev;
2272 * Assume TYPE_DISK for non struct se_device objects.
2273 * Use 32-bit sector value.
2279 * Use 24-bit allocation length for TYPE_TAPE.
2281 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2282 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2285 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2286 (cdb[12] << 8) + cdb[13];
2290 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2292 static inline u32 transport_get_sectors_32(
2298 * Assume TYPE_DISK for non struct se_device objects.
2299 * Use 32-bit sector value.
2301 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2302 (cdb[30] << 8) + cdb[31];
2306 static inline u32 transport_get_size(
2311 struct se_device *dev = cmd->se_dev;
2313 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2314 if (cdb[1] & 1) { /* sectors */
2315 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2320 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2321 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2322 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2323 dev->transport->name);
2325 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2328 static void transport_xor_callback(struct se_cmd *cmd)
2330 unsigned char *buf, *addr;
2331 struct scatterlist *sg;
2332 unsigned int offset;
2336 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2338 * 1) read the specified logical block(s);
2339 * 2) transfer logical blocks from the data-out buffer;
2340 * 3) XOR the logical blocks transferred from the data-out buffer with
2341 * the logical blocks read, storing the resulting XOR data in a buffer;
2342 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2343 * blocks transferred from the data-out buffer; and
2344 * 5) transfer the resulting XOR data to the data-in buffer.
2346 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2348 pr_err("Unable to allocate xor_callback buf\n");
2352 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2353 * into the locally allocated *buf
2355 sg_copy_to_buffer(cmd->t_data_sg,
2361 * Now perform the XOR against the BIDI read memory located at
2362 * cmd->t_mem_bidi_list
2366 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2367 addr = kmap_atomic(sg_page(sg), KM_USER0);
2371 for (i = 0; i < sg->length; i++)
2372 *(addr + sg->offset + i) ^= *(buf + offset + i);
2374 offset += sg->length;
2375 kunmap_atomic(addr, KM_USER0);
2383 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2385 static int transport_get_sense_data(struct se_cmd *cmd)
2387 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2388 struct se_device *dev = cmd->se_dev;
2389 struct se_task *task = NULL, *task_tmp;
2390 unsigned long flags;
2393 WARN_ON(!cmd->se_lun);
2398 spin_lock_irqsave(&cmd->t_state_lock, flags);
2399 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2400 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2404 list_for_each_entry_safe(task, task_tmp,
2405 &cmd->t_task_list, t_list) {
2406 if (!(task->task_flags & TF_HAS_SENSE))
2409 if (!dev->transport->get_sense_buffer) {
2410 pr_err("dev->transport->get_sense_buffer"
2415 sense_buffer = dev->transport->get_sense_buffer(task);
2416 if (!sense_buffer) {
2417 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2418 " sense buffer for task with sense\n",
2419 cmd->se_tfo->get_task_tag(cmd), task);
2422 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2424 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2425 TRANSPORT_SENSE_BUFFER);
2427 memcpy(&buffer[offset], sense_buffer,
2428 TRANSPORT_SENSE_BUFFER);
2429 cmd->scsi_status = task->task_scsi_status;
2430 /* Automatically padded */
2431 cmd->scsi_sense_length =
2432 (TRANSPORT_SENSE_BUFFER + offset);
2434 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2436 dev->se_hba->hba_id, dev->transport->name,
2440 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2445 static inline long long transport_dev_end_lba(struct se_device *dev)
2447 return dev->transport->get_blocks(dev) + 1;
2450 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2452 struct se_device *dev = cmd->se_dev;
2455 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2458 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2460 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2461 pr_err("LBA: %llu Sectors: %u exceeds"
2462 " transport_dev_end_lba(): %llu\n",
2463 cmd->t_task_lba, sectors,
2464 transport_dev_end_lba(dev));
2471 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2474 * Determine if the received WRITE_SAME is used to for direct
2475 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2476 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2477 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2479 int passthrough = (dev->transport->transport_type ==
2480 TRANSPORT_PLUGIN_PHBA_PDEV);
2483 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2484 pr_err("WRITE_SAME PBDATA and LBDATA"
2485 " bits not supported for Block Discard"
2490 * Currently for the emulated case we only accept
2491 * tpws with the UNMAP=1 bit set.
2493 if (!(flags[0] & 0x08)) {
2494 pr_err("WRITE_SAME w/o UNMAP bit not"
2495 " supported for Block Discard Emulation\n");
2503 /* transport_generic_cmd_sequencer():
2505 * Generic Command Sequencer that should work for most DAS transport
2508 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2511 * FIXME: Need to support other SCSI OPCODES where as well.
2513 static int transport_generic_cmd_sequencer(
2517 struct se_device *dev = cmd->se_dev;
2518 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2519 int ret = 0, sector_ret = 0, passthrough;
2520 u32 sectors = 0, size = 0, pr_reg_type = 0;
2524 * Check for an existing UNIT ATTENTION condition
2526 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2527 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2528 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2532 * Check status of Asymmetric Logical Unit Assignment port
2534 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2537 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2538 * The ALUA additional sense code qualifier (ASCQ) is determined
2539 * by the ALUA primary or secondary access state..
2543 pr_debug("[%s]: ALUA TG Port not available,"
2544 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2545 cmd->se_tfo->get_fabric_name(), alua_ascq);
2547 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2548 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2549 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2552 goto out_invalid_cdb_field;
2555 * Check status for SPC-3 Persistent Reservations
2557 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2558 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2559 cmd, cdb, pr_reg_type) != 0) {
2560 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2561 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2562 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2566 * This means the CDB is allowed for the SCSI Initiator port
2567 * when said port is *NOT* holding the legacy SPC-2 or
2568 * SPC-3 Persistent Reservation.
2573 * If we operate in passthrough mode we skip most CDB emulation and
2574 * instead hand the commands down to the physical SCSI device.
2577 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2581 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2583 goto out_unsupported_cdb;
2584 size = transport_get_size(sectors, cdb, cmd);
2585 cmd->t_task_lba = transport_lba_21(cdb);
2586 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2589 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2591 goto out_unsupported_cdb;
2592 size = transport_get_size(sectors, cdb, cmd);
2593 cmd->t_task_lba = transport_lba_32(cdb);
2594 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2597 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2599 goto out_unsupported_cdb;
2600 size = transport_get_size(sectors, cdb, cmd);
2601 cmd->t_task_lba = transport_lba_32(cdb);
2602 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2605 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2607 goto out_unsupported_cdb;
2608 size = transport_get_size(sectors, cdb, cmd);
2609 cmd->t_task_lba = transport_lba_64(cdb);
2610 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2613 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2615 goto out_unsupported_cdb;
2616 size = transport_get_size(sectors, cdb, cmd);
2617 cmd->t_task_lba = transport_lba_21(cdb);
2618 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2621 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2623 goto out_unsupported_cdb;
2624 size = transport_get_size(sectors, cdb, cmd);
2625 cmd->t_task_lba = transport_lba_32(cdb);
2627 cmd->se_cmd_flags |= SCF_FUA;
2628 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2631 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2633 goto out_unsupported_cdb;
2634 size = transport_get_size(sectors, cdb, cmd);
2635 cmd->t_task_lba = transport_lba_32(cdb);
2637 cmd->se_cmd_flags |= SCF_FUA;
2638 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2641 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2643 goto out_unsupported_cdb;
2644 size = transport_get_size(sectors, cdb, cmd);
2645 cmd->t_task_lba = transport_lba_64(cdb);
2647 cmd->se_cmd_flags |= SCF_FUA;
2648 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2650 case XDWRITEREAD_10:
2651 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2652 !(cmd->se_cmd_flags & SCF_BIDI))
2653 goto out_invalid_cdb_field;
2654 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2656 goto out_unsupported_cdb;
2657 size = transport_get_size(sectors, cdb, cmd);
2658 cmd->t_task_lba = transport_lba_32(cdb);
2659 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2662 * Do now allow BIDI commands for passthrough mode.
2665 goto out_unsupported_cdb;
2668 * Setup BIDI XOR callback to be run after I/O completion.
2670 cmd->transport_complete_callback = &transport_xor_callback;
2672 cmd->se_cmd_flags |= SCF_FUA;
2674 case VARIABLE_LENGTH_CMD:
2675 service_action = get_unaligned_be16(&cdb[8]);
2676 switch (service_action) {
2677 case XDWRITEREAD_32:
2678 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2680 goto out_unsupported_cdb;
2681 size = transport_get_size(sectors, cdb, cmd);
2683 * Use WRITE_32 and READ_32 opcodes for the emulated
2684 * XDWRITE_READ_32 logic.
2686 cmd->t_task_lba = transport_lba_64_ext(cdb);
2687 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2690 * Do now allow BIDI commands for passthrough mode.
2693 goto out_unsupported_cdb;
2696 * Setup BIDI XOR callback to be run during after I/O
2699 cmd->transport_complete_callback = &transport_xor_callback;
2701 cmd->se_cmd_flags |= SCF_FUA;
2704 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2706 goto out_unsupported_cdb;
2709 size = transport_get_size(1, cdb, cmd);
2711 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2713 goto out_invalid_cdb_field;
2716 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2717 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2719 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2720 goto out_unsupported_cdb;
2722 cmd->execute_task = target_emulate_write_same;
2725 pr_err("VARIABLE_LENGTH_CMD service action"
2726 " 0x%04x not supported\n", service_action);
2727 goto out_unsupported_cdb;
2730 case MAINTENANCE_IN:
2731 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2732 /* MAINTENANCE_IN from SCC-2 */
2734 * Check for emulated MI_REPORT_TARGET_PGS.
2736 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2737 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2739 target_emulate_report_target_port_groups;
2741 size = (cdb[6] << 24) | (cdb[7] << 16) |
2742 (cdb[8] << 8) | cdb[9];
2744 /* GPCMD_SEND_KEY from multi media commands */
2745 size = (cdb[8] << 8) + cdb[9];
2747 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2751 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2753 case MODE_SELECT_10:
2754 size = (cdb[7] << 8) + cdb[8];
2755 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2759 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2761 cmd->execute_task = target_emulate_modesense;
2764 size = (cdb[7] << 8) + cdb[8];
2765 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2767 cmd->execute_task = target_emulate_modesense;
2769 case GPCMD_READ_BUFFER_CAPACITY:
2770 case GPCMD_SEND_OPC:
2773 size = (cdb[7] << 8) + cdb[8];
2774 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2776 case READ_BLOCK_LIMITS:
2777 size = READ_BLOCK_LEN;
2778 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2780 case GPCMD_GET_CONFIGURATION:
2781 case GPCMD_READ_FORMAT_CAPACITIES:
2782 case GPCMD_READ_DISC_INFO:
2783 case GPCMD_READ_TRACK_RZONE_INFO:
2784 size = (cdb[7] << 8) + cdb[8];
2785 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2787 case PERSISTENT_RESERVE_IN:
2788 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2789 cmd->execute_task = target_scsi3_emulate_pr_in;
2790 size = (cdb[7] << 8) + cdb[8];
2791 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2793 case PERSISTENT_RESERVE_OUT:
2794 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2795 cmd->execute_task = target_scsi3_emulate_pr_out;
2796 size = (cdb[7] << 8) + cdb[8];
2797 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2799 case GPCMD_MECHANISM_STATUS:
2800 case GPCMD_READ_DVD_STRUCTURE:
2801 size = (cdb[8] << 8) + cdb[9];
2802 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2805 size = READ_POSITION_LEN;
2806 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2808 case MAINTENANCE_OUT:
2809 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2810 /* MAINTENANCE_OUT from SCC-2
2812 * Check for emulated MO_SET_TARGET_PGS.
2814 if (cdb[1] == MO_SET_TARGET_PGS &&
2815 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2817 target_emulate_set_target_port_groups;
2820 size = (cdb[6] << 24) | (cdb[7] << 16) |
2821 (cdb[8] << 8) | cdb[9];
2823 /* GPCMD_REPORT_KEY from multi media commands */
2824 size = (cdb[8] << 8) + cdb[9];
2826 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2829 size = (cdb[3] << 8) + cdb[4];
2831 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2832 * See spc4r17 section 5.3
2834 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2835 cmd->sam_task_attr = MSG_HEAD_TAG;
2836 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2838 cmd->execute_task = target_emulate_inquiry;
2841 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2842 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2845 size = READ_CAP_LEN;
2846 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2848 cmd->execute_task = target_emulate_readcapacity;
2850 case READ_MEDIA_SERIAL_NUMBER:
2851 case SECURITY_PROTOCOL_IN:
2852 case SECURITY_PROTOCOL_OUT:
2853 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2854 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2856 case SERVICE_ACTION_IN:
2857 switch (cmd->t_task_cdb[1] & 0x1f) {
2858 case SAI_READ_CAPACITY_16:
2861 target_emulate_readcapacity_16;
2867 pr_err("Unsupported SA: 0x%02x\n",
2868 cmd->t_task_cdb[1] & 0x1f);
2869 goto out_unsupported_cdb;
2872 case ACCESS_CONTROL_IN:
2873 case ACCESS_CONTROL_OUT:
2875 case READ_ATTRIBUTE:
2876 case RECEIVE_COPY_RESULTS:
2877 case WRITE_ATTRIBUTE:
2878 size = (cdb[10] << 24) | (cdb[11] << 16) |
2879 (cdb[12] << 8) | cdb[13];
2880 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2882 case RECEIVE_DIAGNOSTIC:
2883 case SEND_DIAGNOSTIC:
2884 size = (cdb[3] << 8) | cdb[4];
2885 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2887 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2890 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2891 size = (2336 * sectors);
2892 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2897 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2901 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2903 cmd->execute_task = target_emulate_request_sense;
2905 case READ_ELEMENT_STATUS:
2906 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2907 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2910 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2911 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2916 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2917 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2919 if (cdb[0] == RESERVE_10)
2920 size = (cdb[7] << 8) | cdb[8];
2922 size = cmd->data_length;
2925 * Setup the legacy emulated handler for SPC-2 and
2926 * >= SPC-3 compatible reservation handling (CRH=1)
2927 * Otherwise, we assume the underlying SCSI logic is
2928 * is running in SPC_PASSTHROUGH, and wants reservations
2929 * emulation disabled.
2931 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2932 cmd->execute_task = target_scsi2_reservation_reserve;
2933 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2938 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2939 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2941 if (cdb[0] == RELEASE_10)
2942 size = (cdb[7] << 8) | cdb[8];
2944 size = cmd->data_length;
2946 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2947 cmd->execute_task = target_scsi2_reservation_release;
2948 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2950 case SYNCHRONIZE_CACHE:
2951 case SYNCHRONIZE_CACHE_16:
2953 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2955 if (cdb[0] == SYNCHRONIZE_CACHE) {
2956 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2957 cmd->t_task_lba = transport_lba_32(cdb);
2959 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2960 cmd->t_task_lba = transport_lba_64(cdb);
2963 goto out_unsupported_cdb;
2965 size = transport_get_size(sectors, cdb, cmd);
2966 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2972 * Check to ensure that LBA + Range does not exceed past end of
2973 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2975 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2976 if (transport_cmd_get_valid_sectors(cmd) < 0)
2977 goto out_invalid_cdb_field;
2979 cmd->execute_task = target_emulate_synchronize_cache;
2982 size = get_unaligned_be16(&cdb[7]);
2983 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2985 cmd->execute_task = target_emulate_unmap;
2988 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2990 goto out_unsupported_cdb;
2993 size = transport_get_size(1, cdb, cmd);
2995 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2996 goto out_invalid_cdb_field;
2999 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3000 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3002 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3003 goto out_unsupported_cdb;
3005 cmd->execute_task = target_emulate_write_same;
3008 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3010 goto out_unsupported_cdb;
3013 size = transport_get_size(1, cdb, cmd);
3015 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3016 goto out_invalid_cdb_field;
3019 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3020 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3022 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3023 * of byte 1 bit 3 UNMAP instead of original reserved field
3025 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3026 goto out_unsupported_cdb;
3028 cmd->execute_task = target_emulate_write_same;
3030 case ALLOW_MEDIUM_REMOVAL:
3036 case TEST_UNIT_READY:
3038 case WRITE_FILEMARKS:
3039 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3041 cmd->execute_task = target_emulate_noop;
3043 case GPCMD_CLOSE_TRACK:
3044 case INITIALIZE_ELEMENT_STATUS:
3045 case GPCMD_LOAD_UNLOAD:
3046 case GPCMD_SET_SPEED:
3048 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3051 cmd->execute_task = target_report_luns;
3052 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3054 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3055 * See spc4r17 section 5.3
3057 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3058 cmd->sam_task_attr = MSG_HEAD_TAG;
3059 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3062 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3063 " 0x%02x, sending CHECK_CONDITION.\n",
3064 cmd->se_tfo->get_fabric_name(), cdb[0]);
3065 goto out_unsupported_cdb;
3068 if (size != cmd->data_length) {
3069 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3070 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3071 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3072 cmd->data_length, size, cdb[0]);
3074 cmd->cmd_spdtl = size;
3076 if (cmd->data_direction == DMA_TO_DEVICE) {
3077 pr_err("Rejecting underflow/overflow"
3079 goto out_invalid_cdb_field;
3082 * Reject READ_* or WRITE_* with overflow/underflow for
3083 * type SCF_SCSI_DATA_SG_IO_CDB.
3085 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3086 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3087 " CDB on non 512-byte sector setup subsystem"
3088 " plugin: %s\n", dev->transport->name);
3089 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3090 goto out_invalid_cdb_field;
3093 if (size > cmd->data_length) {
3094 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3095 cmd->residual_count = (size - cmd->data_length);
3097 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3098 cmd->residual_count = (cmd->data_length - size);
3100 cmd->data_length = size;
3103 /* reject any command that we don't have a handler for */
3104 if (!(passthrough || cmd->execute_task ||
3105 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3106 goto out_unsupported_cdb;
3108 transport_set_supported_SAM_opcode(cmd);
3111 out_unsupported_cdb:
3112 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3113 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3115 out_invalid_cdb_field:
3116 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3117 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3122 * Called from I/O completion to determine which dormant/delayed
3123 * and ordered cmds need to have their tasks added to the execution queue.
3125 static void transport_complete_task_attr(struct se_cmd *cmd)
3127 struct se_device *dev = cmd->se_dev;
3128 struct se_cmd *cmd_p, *cmd_tmp;
3129 int new_active_tasks = 0;
3131 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3132 atomic_dec(&dev->simple_cmds);
3133 smp_mb__after_atomic_dec();
3134 dev->dev_cur_ordered_id++;
3135 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3136 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3137 cmd->se_ordered_id);
3138 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3139 dev->dev_cur_ordered_id++;
3140 pr_debug("Incremented dev_cur_ordered_id: %u for"
3141 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3142 cmd->se_ordered_id);
3143 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3144 atomic_dec(&dev->dev_ordered_sync);
3145 smp_mb__after_atomic_dec();
3147 dev->dev_cur_ordered_id++;
3148 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3149 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3152 * Process all commands up to the last received
3153 * ORDERED task attribute which requires another blocking
3156 spin_lock(&dev->delayed_cmd_lock);
3157 list_for_each_entry_safe(cmd_p, cmd_tmp,
3158 &dev->delayed_cmd_list, se_delayed_node) {
3160 list_del(&cmd_p->se_delayed_node);
3161 spin_unlock(&dev->delayed_cmd_lock);
3163 pr_debug("Calling add_tasks() for"
3164 " cmd_p: 0x%02x Task Attr: 0x%02x"
3165 " Dormant -> Active, se_ordered_id: %u\n",
3166 cmd_p->t_task_cdb[0],
3167 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3169 transport_add_tasks_from_cmd(cmd_p);
3172 spin_lock(&dev->delayed_cmd_lock);
3173 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3176 spin_unlock(&dev->delayed_cmd_lock);
3178 * If new tasks have become active, wake up the transport thread
3179 * to do the processing of the Active tasks.
3181 if (new_active_tasks != 0)
3182 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3185 static void transport_complete_qf(struct se_cmd *cmd)
3189 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3190 transport_complete_task_attr(cmd);
3192 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3193 ret = cmd->se_tfo->queue_status(cmd);
3198 switch (cmd->data_direction) {
3199 case DMA_FROM_DEVICE:
3200 ret = cmd->se_tfo->queue_data_in(cmd);
3203 if (cmd->t_bidi_data_sg) {
3204 ret = cmd->se_tfo->queue_data_in(cmd);
3208 /* Fall through for DMA_TO_DEVICE */
3210 ret = cmd->se_tfo->queue_status(cmd);
3218 transport_handle_queue_full(cmd, cmd->se_dev);
3221 transport_lun_remove_cmd(cmd);
3222 transport_cmd_check_stop_to_fabric(cmd);
3225 static void transport_handle_queue_full(
3227 struct se_device *dev)
3229 spin_lock_irq(&dev->qf_cmd_lock);
3230 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3231 atomic_inc(&dev->dev_qf_count);
3232 smp_mb__after_atomic_inc();
3233 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3235 schedule_work(&cmd->se_dev->qf_work_queue);
3238 static void target_complete_ok_work(struct work_struct *work)
3240 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3241 int reason = 0, ret;
3244 * Check if we need to move delayed/dormant tasks from cmds on the
3245 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3248 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3249 transport_complete_task_attr(cmd);
3251 * Check to schedule QUEUE_FULL work, or execute an existing
3252 * cmd->transport_qf_callback()
3254 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3255 schedule_work(&cmd->se_dev->qf_work_queue);
3258 * Check if we need to retrieve a sense buffer from
3259 * the struct se_cmd in question.
3261 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3262 if (transport_get_sense_data(cmd) < 0)
3263 reason = TCM_NON_EXISTENT_LUN;
3266 * Only set when an struct se_task->task_scsi_status returned
3267 * a non GOOD status.
3269 if (cmd->scsi_status) {
3270 ret = transport_send_check_condition_and_sense(
3272 if (ret == -EAGAIN || ret == -ENOMEM)
3275 transport_lun_remove_cmd(cmd);
3276 transport_cmd_check_stop_to_fabric(cmd);
3281 * Check for a callback, used by amongst other things
3282 * XDWRITE_READ_10 emulation.
3284 if (cmd->transport_complete_callback)
3285 cmd->transport_complete_callback(cmd);
3287 switch (cmd->data_direction) {
3288 case DMA_FROM_DEVICE:
3289 spin_lock(&cmd->se_lun->lun_sep_lock);
3290 if (cmd->se_lun->lun_sep) {
3291 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3294 spin_unlock(&cmd->se_lun->lun_sep_lock);
3296 ret = cmd->se_tfo->queue_data_in(cmd);
3297 if (ret == -EAGAIN || ret == -ENOMEM)
3301 spin_lock(&cmd->se_lun->lun_sep_lock);
3302 if (cmd->se_lun->lun_sep) {
3303 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3306 spin_unlock(&cmd->se_lun->lun_sep_lock);
3308 * Check if we need to send READ payload for BIDI-COMMAND
3310 if (cmd->t_bidi_data_sg) {
3311 spin_lock(&cmd->se_lun->lun_sep_lock);
3312 if (cmd->se_lun->lun_sep) {
3313 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3316 spin_unlock(&cmd->se_lun->lun_sep_lock);
3317 ret = cmd->se_tfo->queue_data_in(cmd);
3318 if (ret == -EAGAIN || ret == -ENOMEM)
3322 /* Fall through for DMA_TO_DEVICE */
3324 ret = cmd->se_tfo->queue_status(cmd);
3325 if (ret == -EAGAIN || ret == -ENOMEM)
3332 transport_lun_remove_cmd(cmd);
3333 transport_cmd_check_stop_to_fabric(cmd);
3337 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3338 " data_direction: %d\n", cmd, cmd->data_direction);
3339 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3340 transport_handle_queue_full(cmd, cmd->se_dev);
3343 static void transport_free_dev_tasks(struct se_cmd *cmd)
3345 struct se_task *task, *task_tmp;
3346 unsigned long flags;
3347 LIST_HEAD(dispose_list);
3349 spin_lock_irqsave(&cmd->t_state_lock, flags);
3350 list_for_each_entry_safe(task, task_tmp,
3351 &cmd->t_task_list, t_list) {
3352 if (!(task->task_flags & TF_ACTIVE))
3353 list_move_tail(&task->t_list, &dispose_list);
3355 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3357 while (!list_empty(&dispose_list)) {
3358 task = list_first_entry(&dispose_list, struct se_task, t_list);
3360 if (task->task_sg != cmd->t_data_sg &&
3361 task->task_sg != cmd->t_bidi_data_sg)
3362 kfree(task->task_sg);
3364 list_del(&task->t_list);
3366 cmd->se_dev->transport->free_task(task);
3370 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3372 struct scatterlist *sg;
3375 for_each_sg(sgl, sg, nents, count)
3376 __free_page(sg_page(sg));
3381 static inline void transport_free_pages(struct se_cmd *cmd)
3383 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3386 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3387 cmd->t_data_sg = NULL;
3388 cmd->t_data_nents = 0;
3390 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3391 cmd->t_bidi_data_sg = NULL;
3392 cmd->t_bidi_data_nents = 0;
3396 * transport_release_cmd - free a command
3397 * @cmd: command to free
3399 * This routine unconditionally frees a command, and reference counting
3400 * or list removal must be done in the caller.
3402 static void transport_release_cmd(struct se_cmd *cmd)
3404 BUG_ON(!cmd->se_tfo);
3406 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
3407 core_tmr_release_req(cmd->se_tmr_req);
3408 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3409 kfree(cmd->t_task_cdb);
3411 * If this cmd has been setup with target_get_sess_cmd(), drop
3412 * the kref and call ->release_cmd() in kref callback.
3414 if (cmd->check_release != 0) {
3415 target_put_sess_cmd(cmd->se_sess, cmd);
3418 cmd->se_tfo->release_cmd(cmd);
3422 * transport_put_cmd - release a reference to a command
3423 * @cmd: command to release
3425 * This routine releases our reference to the command and frees it if possible.
3427 static void transport_put_cmd(struct se_cmd *cmd)
3429 unsigned long flags;
3432 spin_lock_irqsave(&cmd->t_state_lock, flags);
3433 if (atomic_read(&cmd->t_fe_count)) {
3434 if (!atomic_dec_and_test(&cmd->t_fe_count))
3438 if (atomic_read(&cmd->t_se_count)) {
3439 if (!atomic_dec_and_test(&cmd->t_se_count))
3443 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3444 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3445 transport_all_task_dev_remove_state(cmd);
3448 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3450 if (free_tasks != 0)
3451 transport_free_dev_tasks(cmd);
3453 transport_free_pages(cmd);
3454 transport_release_cmd(cmd);
3457 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3461 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3462 * allocating in the core.
3463 * @cmd: Associated se_cmd descriptor
3464 * @mem: SGL style memory for TCM WRITE / READ
3465 * @sg_mem_num: Number of SGL elements
3466 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3467 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3469 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3472 int transport_generic_map_mem_to_cmd(
3474 struct scatterlist *sgl,
3476 struct scatterlist *sgl_bidi,
3479 if (!sgl || !sgl_count)
3482 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3483 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3485 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3486 * scatterlists already have been set to follow what the fabric
3487 * passes for the original expected data transfer length.
3489 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3490 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3491 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3492 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3493 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3497 cmd->t_data_sg = sgl;
3498 cmd->t_data_nents = sgl_count;
3500 if (sgl_bidi && sgl_bidi_count) {
3501 cmd->t_bidi_data_sg = sgl_bidi;
3502 cmd->t_bidi_data_nents = sgl_bidi_count;
3504 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3509 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3511 void *transport_kmap_data_sg(struct se_cmd *cmd)
3513 struct scatterlist *sg = cmd->t_data_sg;
3514 struct page **pages;
3519 * We need to take into account a possible offset here for fabrics like
3520 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3521 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3523 if (!cmd->t_data_nents)
3525 else if (cmd->t_data_nents == 1)
3526 return kmap(sg_page(sg)) + sg->offset;
3528 /* >1 page. use vmap */
3529 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3533 /* convert sg[] to pages[] */
3534 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3535 pages[i] = sg_page(sg);
3538 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
3540 if (!cmd->t_data_vmap)
3543 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
3545 EXPORT_SYMBOL(transport_kmap_data_sg);
3547 void transport_kunmap_data_sg(struct se_cmd *cmd)
3549 if (!cmd->t_data_nents)
3551 else if (cmd->t_data_nents == 1)
3552 kunmap(sg_page(cmd->t_data_sg));
3554 vunmap(cmd->t_data_vmap);
3555 cmd->t_data_vmap = NULL;
3557 EXPORT_SYMBOL(transport_kunmap_data_sg);
3560 transport_generic_get_mem(struct se_cmd *cmd)
3562 u32 length = cmd->data_length;
3568 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3569 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3570 if (!cmd->t_data_sg)
3573 cmd->t_data_nents = nents;
3574 sg_init_table(cmd->t_data_sg, nents);
3576 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3579 u32 page_len = min_t(u32, length, PAGE_SIZE);
3580 page = alloc_page(GFP_KERNEL | zero_flag);
3584 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3592 __free_page(sg_page(&cmd->t_data_sg[i]));
3595 kfree(cmd->t_data_sg);
3596 cmd->t_data_sg = NULL;
3600 /* Reduce sectors if they are too long for the device */
3601 static inline sector_t transport_limit_task_sectors(
3602 struct se_device *dev,
3603 unsigned long long lba,
3606 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3608 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3609 if ((lba + sectors) > transport_dev_end_lba(dev))
3610 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3617 * This function can be used by HW target mode drivers to create a linked
3618 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3619 * This is intended to be called during the completion path by TCM Core
3620 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3622 void transport_do_task_sg_chain(struct se_cmd *cmd)
3624 struct scatterlist *sg_first = NULL;
3625 struct scatterlist *sg_prev = NULL;
3626 int sg_prev_nents = 0;
3627 struct scatterlist *sg;
3628 struct se_task *task;
3629 u32 chained_nents = 0;
3632 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3635 * Walk the struct se_task list and setup scatterlist chains
3636 * for each contiguously allocated struct se_task->task_sg[].
3638 list_for_each_entry(task, &cmd->t_task_list, t_list) {
3643 sg_first = task->task_sg;
3644 chained_nents = task->task_sg_nents;
3646 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3647 chained_nents += task->task_sg_nents;
3650 * For the padded tasks, use the extra SGL vector allocated
3651 * in transport_allocate_data_tasks() for the sg_prev_nents
3652 * offset into sg_chain() above.
3654 * We do not need the padding for the last task (or a single
3655 * task), but in that case we will never use the sg_prev_nents
3656 * value below which would be incorrect.
3658 sg_prev_nents = (task->task_sg_nents + 1);
3659 sg_prev = task->task_sg;
3662 * Setup the starting pointer and total t_tasks_sg_linked_no including
3663 * padding SGs for linking and to mark the end.
3665 cmd->t_tasks_sg_chained = sg_first;
3666 cmd->t_tasks_sg_chained_no = chained_nents;
3668 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3669 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3670 cmd->t_tasks_sg_chained_no);
3672 for_each_sg(cmd->t_tasks_sg_chained, sg,
3673 cmd->t_tasks_sg_chained_no, i) {
3675 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3676 i, sg, sg_page(sg), sg->length, sg->offset);
3677 if (sg_is_chain(sg))
3678 pr_debug("SG: %p sg_is_chain=1\n", sg);
3680 pr_debug("SG: %p sg_is_last=1\n", sg);
3683 EXPORT_SYMBOL(transport_do_task_sg_chain);
3686 * Break up cmd into chunks transport can handle
3689 transport_allocate_data_tasks(struct se_cmd *cmd,
3690 enum dma_data_direction data_direction,
3691 struct scatterlist *cmd_sg, unsigned int sgl_nents)
3693 struct se_device *dev = cmd->se_dev;
3695 unsigned long long lba;
3696 sector_t sectors, dev_max_sectors;
3699 if (transport_cmd_get_valid_sectors(cmd) < 0)
3702 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3703 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3705 WARN_ON(cmd->data_length % sector_size);
3707 lba = cmd->t_task_lba;
3708 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3709 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3712 * If we need just a single task reuse the SG list in the command
3713 * and avoid a lot of work.
3715 if (task_count == 1) {
3716 struct se_task *task;
3717 unsigned long flags;
3719 task = transport_generic_get_task(cmd, data_direction);
3723 task->task_sg = cmd_sg;
3724 task->task_sg_nents = sgl_nents;
3726 task->task_lba = lba;
3727 task->task_sectors = sectors;
3728 task->task_size = task->task_sectors * sector_size;
3730 spin_lock_irqsave(&cmd->t_state_lock, flags);
3731 list_add_tail(&task->t_list, &cmd->t_task_list);
3732 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3737 for (i = 0; i < task_count; i++) {
3738 struct se_task *task;
3739 unsigned int task_size, task_sg_nents_padded;
3740 struct scatterlist *sg;
3741 unsigned long flags;
3744 task = transport_generic_get_task(cmd, data_direction);
3748 task->task_lba = lba;
3749 task->task_sectors = min(sectors, dev_max_sectors);
3750 task->task_size = task->task_sectors * sector_size;
3753 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3754 * in order to calculate the number per task SGL entries
3756 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3758 * Check if the fabric module driver is requesting that all
3759 * struct se_task->task_sg[] be chained together.. If so,
3760 * then allocate an extra padding SG entry for linking and
3761 * marking the end of the chained SGL for every task except
3762 * the last one for (task_count > 1) operation, or skipping
3763 * the extra padding for the (task_count == 1) case.
3765 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3766 task_sg_nents_padded = (task->task_sg_nents + 1);
3768 task_sg_nents_padded = task->task_sg_nents;
3770 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3771 task_sg_nents_padded, GFP_KERNEL);
3772 if (!task->task_sg) {
3773 cmd->se_dev->transport->free_task(task);
3777 sg_init_table(task->task_sg, task_sg_nents_padded);
3779 task_size = task->task_size;
3781 /* Build new sgl, only up to task_size */
3782 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3783 if (cmd_sg->length > task_size)
3787 task_size -= cmd_sg->length;
3788 cmd_sg = sg_next(cmd_sg);
3791 lba += task->task_sectors;
3792 sectors -= task->task_sectors;
3794 spin_lock_irqsave(&cmd->t_state_lock, flags);
3795 list_add_tail(&task->t_list, &cmd->t_task_list);
3796 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3803 transport_allocate_control_task(struct se_cmd *cmd)
3805 struct se_task *task;
3806 unsigned long flags;
3808 /* Workaround for handling zero-length control CDBs */
3809 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3813 task = transport_generic_get_task(cmd, cmd->data_direction);
3817 task->task_sg = cmd->t_data_sg;
3818 task->task_size = cmd->data_length;
3819 task->task_sg_nents = cmd->t_data_nents;
3821 spin_lock_irqsave(&cmd->t_state_lock, flags);
3822 list_add_tail(&task->t_list, &cmd->t_task_list);
3823 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3825 /* Success! Return number of tasks allocated */
3830 * Allocate any required ressources to execute the command, and either place
3831 * it on the execution queue if possible. For writes we might not have the
3832 * payload yet, thus notify the fabric via a call to ->write_pending instead.
3834 int transport_generic_new_cmd(struct se_cmd *cmd)
3836 struct se_device *dev = cmd->se_dev;
3837 int task_cdbs, task_cdbs_bidi = 0;
3842 * Determine is the TCM fabric module has already allocated physical
3843 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3846 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3848 ret = transport_generic_get_mem(cmd);
3854 * For BIDI command set up the read tasks first.
3856 if (cmd->t_bidi_data_sg &&
3857 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3858 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3860 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3861 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3862 cmd->t_bidi_data_nents);
3863 if (task_cdbs_bidi <= 0)
3866 atomic_inc(&cmd->t_fe_count);
3867 atomic_inc(&cmd->t_se_count);
3871 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3872 task_cdbs = transport_allocate_data_tasks(cmd,
3873 cmd->data_direction, cmd->t_data_sg,
3876 task_cdbs = transport_allocate_control_task(cmd);
3881 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3882 spin_lock_irq(&cmd->t_state_lock);
3883 cmd->t_state = TRANSPORT_COMPLETE;
3884 cmd->transport_state |= CMD_T_ACTIVE;
3885 spin_unlock_irq(&cmd->t_state_lock);
3887 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3888 u8 ua_asc = 0, ua_ascq = 0;
3890 core_scsi3_ua_clear_for_request_sense(cmd,
3894 INIT_WORK(&cmd->work, target_complete_ok_work);
3895 queue_work(target_completion_wq, &cmd->work);
3900 atomic_inc(&cmd->t_fe_count);
3901 atomic_inc(&cmd->t_se_count);
3904 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3905 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3906 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3909 * For WRITEs, let the fabric know its buffer is ready..
3910 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3911 * will be added to the struct se_device execution queue after its WRITE
3912 * data has arrived. (ie: It gets handled by the transport processing
3913 * thread a second time)
3915 if (cmd->data_direction == DMA_TO_DEVICE) {
3916 transport_add_tasks_to_state_queue(cmd);
3917 return transport_generic_write_pending(cmd);
3920 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3921 * to the execution queue.
3923 transport_execute_tasks(cmd);
3927 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3928 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3931 EXPORT_SYMBOL(transport_generic_new_cmd);
3933 /* transport_generic_process_write():
3937 void transport_generic_process_write(struct se_cmd *cmd)
3939 transport_execute_tasks(cmd);
3941 EXPORT_SYMBOL(transport_generic_process_write);
3943 static void transport_write_pending_qf(struct se_cmd *cmd)
3947 ret = cmd->se_tfo->write_pending(cmd);
3948 if (ret == -EAGAIN || ret == -ENOMEM) {
3949 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3951 transport_handle_queue_full(cmd, cmd->se_dev);
3955 static int transport_generic_write_pending(struct se_cmd *cmd)
3957 unsigned long flags;
3960 spin_lock_irqsave(&cmd->t_state_lock, flags);
3961 cmd->t_state = TRANSPORT_WRITE_PENDING;
3962 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3965 * Clear the se_cmd for WRITE_PENDING status in order to set
3966 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3967 * from HW target mode interrupt code. This is safe to be called
3968 * with transport_off=1 before the cmd->se_tfo->write_pending
3969 * because the se_cmd->se_lun pointer is not being cleared.
3971 transport_cmd_check_stop(cmd, 1, 0);
3974 * Call the fabric write_pending function here to let the
3975 * frontend know that WRITE buffers are ready.
3977 ret = cmd->se_tfo->write_pending(cmd);
3978 if (ret == -EAGAIN || ret == -ENOMEM)
3986 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3987 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3988 transport_handle_queue_full(cmd, cmd->se_dev);
3992 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3994 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3995 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
3996 transport_wait_for_tasks(cmd);
3998 transport_release_cmd(cmd);
4001 transport_wait_for_tasks(cmd);
4003 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4006 transport_lun_remove_cmd(cmd);
4008 transport_free_dev_tasks(cmd);
4010 transport_put_cmd(cmd);
4013 EXPORT_SYMBOL(transport_generic_free_cmd);
4015 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
4016 * @se_sess: session to reference
4017 * @se_cmd: command descriptor to add
4018 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
4020 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
4023 unsigned long flags;
4025 kref_init(&se_cmd->cmd_kref);
4027 * Add a second kref if the fabric caller is expecting to handle
4028 * fabric acknowledgement that requires two target_put_sess_cmd()
4029 * invocations before se_cmd descriptor release.
4031 if (ack_kref == true)
4032 kref_get(&se_cmd->cmd_kref);
4034 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4035 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4036 se_cmd->check_release = 1;
4037 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4039 EXPORT_SYMBOL(target_get_sess_cmd);
4041 static void target_release_cmd_kref(struct kref *kref)
4043 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
4044 struct se_session *se_sess = se_cmd->se_sess;
4045 unsigned long flags;
4047 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4048 if (list_empty(&se_cmd->se_cmd_list)) {
4049 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4053 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4054 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4055 complete(&se_cmd->cmd_wait_comp);
4058 list_del(&se_cmd->se_cmd_list);
4059 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4061 se_cmd->se_tfo->release_cmd(se_cmd);
4064 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4065 * @se_sess: session to reference
4066 * @se_cmd: command descriptor to drop
4068 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4070 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
4072 EXPORT_SYMBOL(target_put_sess_cmd);
4074 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4075 * @se_sess: session to split
4077 void target_splice_sess_cmd_list(struct se_session *se_sess)
4079 struct se_cmd *se_cmd;
4080 unsigned long flags;
4082 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4083 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4085 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4086 se_sess->sess_tearing_down = 1;
4088 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4090 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4091 se_cmd->cmd_wait_set = 1;
4093 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4095 EXPORT_SYMBOL(target_splice_sess_cmd_list);
4097 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4098 * @se_sess: session to wait for active I/O
4099 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4101 void target_wait_for_sess_cmds(
4102 struct se_session *se_sess,
4105 struct se_cmd *se_cmd, *tmp_cmd;
4108 list_for_each_entry_safe(se_cmd, tmp_cmd,
4109 &se_sess->sess_wait_list, se_cmd_list) {
4110 list_del(&se_cmd->se_cmd_list);
4112 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4113 " %d\n", se_cmd, se_cmd->t_state,
4114 se_cmd->se_tfo->get_cmd_state(se_cmd));
4116 if (wait_for_tasks) {
4117 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4118 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4119 se_cmd->se_tfo->get_cmd_state(se_cmd));
4121 rc = transport_wait_for_tasks(se_cmd);
4123 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4124 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4125 se_cmd->se_tfo->get_cmd_state(se_cmd));
4129 wait_for_completion(&se_cmd->cmd_wait_comp);
4130 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4131 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4132 se_cmd->se_tfo->get_cmd_state(se_cmd));
4135 se_cmd->se_tfo->release_cmd(se_cmd);
4138 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4140 /* transport_lun_wait_for_tasks():
4142 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4143 * an struct se_lun to be successfully shutdown.
4145 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4147 unsigned long flags;
4150 * If the frontend has already requested this struct se_cmd to
4151 * be stopped, we can safely ignore this struct se_cmd.
4153 spin_lock_irqsave(&cmd->t_state_lock, flags);
4154 if (cmd->transport_state & CMD_T_STOP) {
4155 cmd->transport_state &= ~CMD_T_LUN_STOP;
4157 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
4158 cmd->se_tfo->get_task_tag(cmd));
4159 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4160 transport_cmd_check_stop(cmd, 1, 0);
4163 cmd->transport_state |= CMD_T_LUN_FE_STOP;
4164 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4166 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4168 ret = transport_stop_tasks_for_cmd(cmd);
4170 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4171 " %d\n", cmd, cmd->t_task_list_num, ret);
4173 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4174 cmd->se_tfo->get_task_tag(cmd));
4175 wait_for_completion(&cmd->transport_lun_stop_comp);
4176 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4177 cmd->se_tfo->get_task_tag(cmd));
4179 transport_remove_cmd_from_queue(cmd);
4184 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4186 struct se_cmd *cmd = NULL;
4187 unsigned long lun_flags, cmd_flags;
4189 * Do exception processing and return CHECK_CONDITION status to the
4192 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4193 while (!list_empty(&lun->lun_cmd_list)) {
4194 cmd = list_first_entry(&lun->lun_cmd_list,
4195 struct se_cmd, se_lun_node);
4196 list_del_init(&cmd->se_lun_node);
4199 * This will notify iscsi_target_transport.c:
4200 * transport_cmd_check_stop() that a LUN shutdown is in
4201 * progress for the iscsi_cmd_t.
4203 spin_lock(&cmd->t_state_lock);
4204 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4205 "_lun_stop for ITT: 0x%08x\n",
4206 cmd->se_lun->unpacked_lun,
4207 cmd->se_tfo->get_task_tag(cmd));
4208 cmd->transport_state |= CMD_T_LUN_STOP;
4209 spin_unlock(&cmd->t_state_lock);
4211 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4214 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4215 cmd->se_tfo->get_task_tag(cmd),
4216 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4220 * If the Storage engine still owns the iscsi_cmd_t, determine
4221 * and/or stop its context.
4223 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4224 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4225 cmd->se_tfo->get_task_tag(cmd));
4227 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4228 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4232 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4233 "_wait_for_tasks(): SUCCESS\n",
4234 cmd->se_lun->unpacked_lun,
4235 cmd->se_tfo->get_task_tag(cmd));
4237 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4238 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
4239 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4242 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
4243 transport_all_task_dev_remove_state(cmd);
4244 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4246 transport_free_dev_tasks(cmd);
4248 * The Storage engine stopped this struct se_cmd before it was
4249 * send to the fabric frontend for delivery back to the
4250 * Initiator Node. Return this SCSI CDB back with an
4251 * CHECK_CONDITION status.
4254 transport_send_check_condition_and_sense(cmd,
4255 TCM_NON_EXISTENT_LUN, 0);
4257 * If the fabric frontend is waiting for this iscsi_cmd_t to
4258 * be released, notify the waiting thread now that LU has
4259 * finished accessing it.
4261 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4262 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
4263 pr_debug("SE_LUN[%d] - Detected FE stop for"
4264 " struct se_cmd: %p ITT: 0x%08x\n",
4266 cmd, cmd->se_tfo->get_task_tag(cmd));
4268 spin_unlock_irqrestore(&cmd->t_state_lock,
4270 transport_cmd_check_stop(cmd, 1, 0);
4271 complete(&cmd->transport_lun_fe_stop_comp);
4272 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4275 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4276 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4278 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4279 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4281 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4284 static int transport_clear_lun_thread(void *p)
4286 struct se_lun *lun = p;
4288 __transport_clear_lun_from_sessions(lun);
4289 complete(&lun->lun_shutdown_comp);
4294 int transport_clear_lun_from_sessions(struct se_lun *lun)
4296 struct task_struct *kt;
4298 kt = kthread_run(transport_clear_lun_thread, lun,
4299 "tcm_cl_%u", lun->unpacked_lun);
4301 pr_err("Unable to start clear_lun thread\n");
4304 wait_for_completion(&lun->lun_shutdown_comp);
4310 * transport_wait_for_tasks - wait for completion to occur
4311 * @cmd: command to wait
4313 * Called from frontend fabric context to wait for storage engine
4314 * to pause and/or release frontend generated struct se_cmd.
4316 bool transport_wait_for_tasks(struct se_cmd *cmd)
4318 unsigned long flags;
4320 spin_lock_irqsave(&cmd->t_state_lock, flags);
4321 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
4322 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
4323 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4327 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4328 * has been set in transport_set_supported_SAM_opcode().
4330 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
4331 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
4332 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4336 * If we are already stopped due to an external event (ie: LUN shutdown)
4337 * sleep until the connection can have the passed struct se_cmd back.
4338 * The cmd->transport_lun_stopped_sem will be upped by
4339 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4340 * has completed its operation on the struct se_cmd.
4342 if (cmd->transport_state & CMD_T_LUN_STOP) {
4343 pr_debug("wait_for_tasks: Stopping"
4344 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4345 "_stop_comp); for ITT: 0x%08x\n",
4346 cmd->se_tfo->get_task_tag(cmd));
4348 * There is a special case for WRITES where a FE exception +
4349 * LUN shutdown means ConfigFS context is still sleeping on
4350 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4351 * We go ahead and up transport_lun_stop_comp just to be sure
4354 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4355 complete(&cmd->transport_lun_stop_comp);
4356 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4357 spin_lock_irqsave(&cmd->t_state_lock, flags);
4359 transport_all_task_dev_remove_state(cmd);
4361 * At this point, the frontend who was the originator of this
4362 * struct se_cmd, now owns the structure and can be released through
4363 * normal means below.
4365 pr_debug("wait_for_tasks: Stopped"
4366 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4367 "stop_comp); for ITT: 0x%08x\n",
4368 cmd->se_tfo->get_task_tag(cmd));
4370 cmd->transport_state &= ~CMD_T_LUN_STOP;
4373 if (!(cmd->transport_state & CMD_T_ACTIVE) ||
4374 (cmd->transport_state & CMD_T_ABORTED)) {
4375 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4379 cmd->transport_state |= CMD_T_STOP;
4381 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4382 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4383 cmd, cmd->se_tfo->get_task_tag(cmd),
4384 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4386 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4388 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4390 wait_for_completion(&cmd->t_transport_stop_comp);
4392 spin_lock_irqsave(&cmd->t_state_lock, flags);
4393 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
4395 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4396 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4397 cmd->se_tfo->get_task_tag(cmd));
4399 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4403 EXPORT_SYMBOL(transport_wait_for_tasks);
4405 static int transport_get_sense_codes(
4410 *asc = cmd->scsi_asc;
4411 *ascq = cmd->scsi_ascq;
4416 static int transport_set_sense_codes(
4421 cmd->scsi_asc = asc;
4422 cmd->scsi_ascq = ascq;
4427 int transport_send_check_condition_and_sense(
4432 unsigned char *buffer = cmd->sense_buffer;
4433 unsigned long flags;
4435 u8 asc = 0, ascq = 0;
4437 spin_lock_irqsave(&cmd->t_state_lock, flags);
4438 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4439 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4442 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4443 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4445 if (!reason && from_transport)
4448 if (!from_transport)
4449 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4451 * Data Segment and SenseLength of the fabric response PDU.
4453 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4454 * from include/scsi/scsi_cmnd.h
4456 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4457 TRANSPORT_SENSE_BUFFER);
4459 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4460 * SENSE KEY values from include/scsi/scsi.h
4463 case TCM_NON_EXISTENT_LUN:
4465 buffer[offset] = 0x70;
4466 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4467 /* ILLEGAL REQUEST */
4468 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4469 /* LOGICAL UNIT NOT SUPPORTED */
4470 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4472 case TCM_UNSUPPORTED_SCSI_OPCODE:
4473 case TCM_SECTOR_COUNT_TOO_MANY:
4475 buffer[offset] = 0x70;
4476 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4477 /* ILLEGAL REQUEST */
4478 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4479 /* INVALID COMMAND OPERATION CODE */
4480 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4482 case TCM_UNKNOWN_MODE_PAGE:
4484 buffer[offset] = 0x70;
4485 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4486 /* ILLEGAL REQUEST */
4487 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4488 /* INVALID FIELD IN CDB */
4489 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4491 case TCM_CHECK_CONDITION_ABORT_CMD:
4493 buffer[offset] = 0x70;
4494 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4495 /* ABORTED COMMAND */
4496 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4497 /* BUS DEVICE RESET FUNCTION OCCURRED */
4498 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4499 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4501 case TCM_INCORRECT_AMOUNT_OF_DATA:
4503 buffer[offset] = 0x70;
4504 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4505 /* ABORTED COMMAND */
4506 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4508 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4509 /* NOT ENOUGH UNSOLICITED DATA */
4510 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4512 case TCM_INVALID_CDB_FIELD:
4514 buffer[offset] = 0x70;
4515 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4516 /* ILLEGAL REQUEST */
4517 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4518 /* INVALID FIELD IN CDB */
4519 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4521 case TCM_INVALID_PARAMETER_LIST:
4523 buffer[offset] = 0x70;
4524 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4525 /* ILLEGAL REQUEST */
4526 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4527 /* INVALID FIELD IN PARAMETER LIST */
4528 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4530 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4532 buffer[offset] = 0x70;
4533 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4534 /* ABORTED COMMAND */
4535 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4537 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4538 /* UNEXPECTED_UNSOLICITED_DATA */
4539 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4541 case TCM_SERVICE_CRC_ERROR:
4543 buffer[offset] = 0x70;
4544 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4545 /* ABORTED COMMAND */
4546 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4547 /* PROTOCOL SERVICE CRC ERROR */
4548 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4550 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4552 case TCM_SNACK_REJECTED:
4554 buffer[offset] = 0x70;
4555 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4556 /* ABORTED COMMAND */
4557 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4559 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4560 /* FAILED RETRANSMISSION REQUEST */
4561 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4563 case TCM_WRITE_PROTECTED:
4565 buffer[offset] = 0x70;
4566 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4568 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4569 /* WRITE PROTECTED */
4570 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4572 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4574 buffer[offset] = 0x70;
4575 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4576 /* UNIT ATTENTION */
4577 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4578 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4579 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4580 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4582 case TCM_CHECK_CONDITION_NOT_READY:
4584 buffer[offset] = 0x70;
4585 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4587 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4588 transport_get_sense_codes(cmd, &asc, &ascq);
4589 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4590 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4592 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4595 buffer[offset] = 0x70;
4596 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4597 /* ILLEGAL REQUEST */
4598 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4599 /* LOGICAL UNIT COMMUNICATION FAILURE */
4600 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4604 * This code uses linux/include/scsi/scsi.h SAM status codes!
4606 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4608 * Automatically padded, this value is encoded in the fabric's
4609 * data_length response PDU containing the SCSI defined sense data.
4611 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4614 return cmd->se_tfo->queue_status(cmd);
4616 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4618 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4622 if (cmd->transport_state & CMD_T_ABORTED) {
4624 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4627 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4628 " status for CDB: 0x%02x ITT: 0x%08x\n",
4630 cmd->se_tfo->get_task_tag(cmd));
4632 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4633 cmd->se_tfo->queue_status(cmd);
4638 EXPORT_SYMBOL(transport_check_aborted_status);
4640 void transport_send_task_abort(struct se_cmd *cmd)
4642 unsigned long flags;
4644 spin_lock_irqsave(&cmd->t_state_lock, flags);
4645 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4646 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4649 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4652 * If there are still expected incoming fabric WRITEs, we wait
4653 * until until they have completed before sending a TASK_ABORTED
4654 * response. This response with TASK_ABORTED status will be
4655 * queued back to fabric module by transport_check_aborted_status().
4657 if (cmd->data_direction == DMA_TO_DEVICE) {
4658 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4659 cmd->transport_state |= CMD_T_ABORTED;
4660 smp_mb__after_atomic_inc();
4663 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4665 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4666 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4667 cmd->se_tfo->get_task_tag(cmd));
4669 cmd->se_tfo->queue_status(cmd);
4672 static int transport_generic_do_tmr(struct se_cmd *cmd)
4674 struct se_device *dev = cmd->se_dev;
4675 struct se_tmr_req *tmr = cmd->se_tmr_req;
4678 switch (tmr->function) {
4679 case TMR_ABORT_TASK:
4680 tmr->response = TMR_FUNCTION_REJECTED;
4682 case TMR_ABORT_TASK_SET:
4684 case TMR_CLEAR_TASK_SET:
4685 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4688 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4689 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4690 TMR_FUNCTION_REJECTED;
4692 case TMR_TARGET_WARM_RESET:
4693 tmr->response = TMR_FUNCTION_REJECTED;
4695 case TMR_TARGET_COLD_RESET:
4696 tmr->response = TMR_FUNCTION_REJECTED;
4699 pr_err("Uknown TMR function: 0x%02x.\n",
4701 tmr->response = TMR_FUNCTION_REJECTED;
4705 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4706 cmd->se_tfo->queue_tm_rsp(cmd);
4708 transport_cmd_check_stop_to_fabric(cmd);
4712 /* transport_processing_thread():
4716 static int transport_processing_thread(void *param)
4720 struct se_device *dev = param;
4722 while (!kthread_should_stop()) {
4723 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4724 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4725 kthread_should_stop());
4730 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4734 switch (cmd->t_state) {
4735 case TRANSPORT_NEW_CMD:
4738 case TRANSPORT_NEW_CMD_MAP:
4739 if (!cmd->se_tfo->new_cmd_map) {
4740 pr_err("cmd->se_tfo->new_cmd_map is"
4741 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4744 ret = cmd->se_tfo->new_cmd_map(cmd);
4746 transport_generic_request_failure(cmd);
4749 ret = transport_generic_new_cmd(cmd);
4751 transport_generic_request_failure(cmd);
4755 case TRANSPORT_PROCESS_WRITE:
4756 transport_generic_process_write(cmd);
4758 case TRANSPORT_PROCESS_TMR:
4759 transport_generic_do_tmr(cmd);
4761 case TRANSPORT_COMPLETE_QF_WP:
4762 transport_write_pending_qf(cmd);
4764 case TRANSPORT_COMPLETE_QF_OK:
4765 transport_complete_qf(cmd);
4768 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4769 "i_state: %d on SE LUN: %u\n",
4771 cmd->se_tfo->get_task_tag(cmd),
4772 cmd->se_tfo->get_cmd_state(cmd),
4773 cmd->se_lun->unpacked_lun);
4781 WARN_ON(!list_empty(&dev->state_task_list));
4782 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4783 dev->process_thread = NULL;