1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
38 #include <linux/cdrom.h>
39 #include <asm/unaligned.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_tcq.h>
46 #include <target/target_core_base.h>
47 #include <target/target_core_device.h>
48 #include <target/target_core_tmr.h>
49 #include <target/target_core_tpg.h>
50 #include <target/target_core_transport.h>
51 #include <target/target_core_fabric_ops.h>
52 #include <target/target_core_configfs.h>
54 #include "target_core_alua.h"
55 #include "target_core_hba.h"
56 #include "target_core_pr.h"
57 #include "target_core_ua.h"
59 static int sub_api_initialized;
61 static struct kmem_cache *se_cmd_cache;
62 static struct kmem_cache *se_sess_cache;
63 struct kmem_cache *se_tmr_req_cache;
64 struct kmem_cache *se_ua_cache;
65 struct kmem_cache *t10_pr_reg_cache;
66 struct kmem_cache *t10_alua_lu_gp_cache;
67 struct kmem_cache *t10_alua_lu_gp_mem_cache;
68 struct kmem_cache *t10_alua_tg_pt_gp_cache;
69 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71 static int transport_generic_write_pending(struct se_cmd *);
72 static int transport_processing_thread(void *param);
73 static int __transport_execute_tasks(struct se_device *dev);
74 static void transport_complete_task_attr(struct se_cmd *cmd);
75 static void transport_handle_queue_full(struct se_cmd *cmd,
76 struct se_device *dev);
77 static void transport_direct_request_timeout(struct se_cmd *cmd);
78 static void transport_free_dev_tasks(struct se_cmd *cmd);
79 static u32 transport_allocate_tasks(struct se_cmd *cmd,
80 unsigned long long starting_lba,
81 enum dma_data_direction data_direction,
82 struct scatterlist *sgl, unsigned int nents);
83 static int transport_generic_get_mem(struct se_cmd *cmd);
84 static void transport_put_cmd(struct se_cmd *cmd);
85 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
86 struct se_queue_obj *qobj);
87 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
88 static void transport_stop_all_task_timers(struct se_cmd *cmd);
90 int init_se_kmem_caches(void)
92 se_cmd_cache = kmem_cache_create("se_cmd_cache",
93 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
95 pr_err("kmem_cache_create for struct se_cmd failed\n");
98 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
99 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
101 if (!se_tmr_req_cache) {
102 pr_err("kmem_cache_create() for struct se_tmr_req"
106 se_sess_cache = kmem_cache_create("se_sess_cache",
107 sizeof(struct se_session), __alignof__(struct se_session),
109 if (!se_sess_cache) {
110 pr_err("kmem_cache_create() for struct se_session"
114 se_ua_cache = kmem_cache_create("se_ua_cache",
115 sizeof(struct se_ua), __alignof__(struct se_ua),
118 pr_err("kmem_cache_create() for struct se_ua failed\n");
121 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
122 sizeof(struct t10_pr_registration),
123 __alignof__(struct t10_pr_registration), 0, NULL);
124 if (!t10_pr_reg_cache) {
125 pr_err("kmem_cache_create() for struct t10_pr_registration"
129 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
130 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
132 if (!t10_alua_lu_gp_cache) {
133 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
137 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
138 sizeof(struct t10_alua_lu_gp_member),
139 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
140 if (!t10_alua_lu_gp_mem_cache) {
141 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
145 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
146 sizeof(struct t10_alua_tg_pt_gp),
147 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
148 if (!t10_alua_tg_pt_gp_cache) {
149 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
153 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
154 "t10_alua_tg_pt_gp_mem_cache",
155 sizeof(struct t10_alua_tg_pt_gp_member),
156 __alignof__(struct t10_alua_tg_pt_gp_member),
158 if (!t10_alua_tg_pt_gp_mem_cache) {
159 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
167 kmem_cache_destroy(se_cmd_cache);
168 if (se_tmr_req_cache)
169 kmem_cache_destroy(se_tmr_req_cache);
171 kmem_cache_destroy(se_sess_cache);
173 kmem_cache_destroy(se_ua_cache);
174 if (t10_pr_reg_cache)
175 kmem_cache_destroy(t10_pr_reg_cache);
176 if (t10_alua_lu_gp_cache)
177 kmem_cache_destroy(t10_alua_lu_gp_cache);
178 if (t10_alua_lu_gp_mem_cache)
179 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
180 if (t10_alua_tg_pt_gp_cache)
181 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
182 if (t10_alua_tg_pt_gp_mem_cache)
183 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
187 void release_se_kmem_caches(void)
189 kmem_cache_destroy(se_cmd_cache);
190 kmem_cache_destroy(se_tmr_req_cache);
191 kmem_cache_destroy(se_sess_cache);
192 kmem_cache_destroy(se_ua_cache);
193 kmem_cache_destroy(t10_pr_reg_cache);
194 kmem_cache_destroy(t10_alua_lu_gp_cache);
195 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
196 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
197 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
200 /* This code ensures unique mib indexes are handed out. */
201 static DEFINE_SPINLOCK(scsi_mib_index_lock);
202 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
205 * Allocate a new row index for the entry type specified
207 u32 scsi_get_new_index(scsi_index_t type)
211 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
213 spin_lock(&scsi_mib_index_lock);
214 new_index = ++scsi_mib_index[type];
215 spin_unlock(&scsi_mib_index_lock);
220 void transport_init_queue_obj(struct se_queue_obj *qobj)
222 atomic_set(&qobj->queue_cnt, 0);
223 INIT_LIST_HEAD(&qobj->qobj_list);
224 init_waitqueue_head(&qobj->thread_wq);
225 spin_lock_init(&qobj->cmd_queue_lock);
227 EXPORT_SYMBOL(transport_init_queue_obj);
229 static int transport_subsystem_reqmods(void)
233 ret = request_module("target_core_iblock");
235 pr_err("Unable to load target_core_iblock\n");
237 ret = request_module("target_core_file");
239 pr_err("Unable to load target_core_file\n");
241 ret = request_module("target_core_pscsi");
243 pr_err("Unable to load target_core_pscsi\n");
245 ret = request_module("target_core_stgt");
247 pr_err("Unable to load target_core_stgt\n");
252 int transport_subsystem_check_init(void)
256 if (sub_api_initialized)
259 * Request the loading of known TCM subsystem plugins..
261 ret = transport_subsystem_reqmods();
265 sub_api_initialized = 1;
269 struct se_session *transport_init_session(void)
271 struct se_session *se_sess;
273 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
275 pr_err("Unable to allocate struct se_session from"
277 return ERR_PTR(-ENOMEM);
279 INIT_LIST_HEAD(&se_sess->sess_list);
280 INIT_LIST_HEAD(&se_sess->sess_acl_list);
284 EXPORT_SYMBOL(transport_init_session);
287 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
289 void __transport_register_session(
290 struct se_portal_group *se_tpg,
291 struct se_node_acl *se_nacl,
292 struct se_session *se_sess,
293 void *fabric_sess_ptr)
295 unsigned char buf[PR_REG_ISID_LEN];
297 se_sess->se_tpg = se_tpg;
298 se_sess->fabric_sess_ptr = fabric_sess_ptr;
300 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
302 * Only set for struct se_session's that will actually be moving I/O.
303 * eg: *NOT* discovery sessions.
307 * If the fabric module supports an ISID based TransportID,
308 * save this value in binary from the fabric I_T Nexus now.
310 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
311 memset(&buf[0], 0, PR_REG_ISID_LEN);
312 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
313 &buf[0], PR_REG_ISID_LEN);
314 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
316 spin_lock_irq(&se_nacl->nacl_sess_lock);
318 * The se_nacl->nacl_sess pointer will be set to the
319 * last active I_T Nexus for each struct se_node_acl.
321 se_nacl->nacl_sess = se_sess;
323 list_add_tail(&se_sess->sess_acl_list,
324 &se_nacl->acl_sess_list);
325 spin_unlock_irq(&se_nacl->nacl_sess_lock);
327 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
329 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
330 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
332 EXPORT_SYMBOL(__transport_register_session);
334 void transport_register_session(
335 struct se_portal_group *se_tpg,
336 struct se_node_acl *se_nacl,
337 struct se_session *se_sess,
338 void *fabric_sess_ptr)
340 spin_lock_bh(&se_tpg->session_lock);
341 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
342 spin_unlock_bh(&se_tpg->session_lock);
344 EXPORT_SYMBOL(transport_register_session);
346 void transport_deregister_session_configfs(struct se_session *se_sess)
348 struct se_node_acl *se_nacl;
351 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
353 se_nacl = se_sess->se_node_acl;
355 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
356 list_del(&se_sess->sess_acl_list);
358 * If the session list is empty, then clear the pointer.
359 * Otherwise, set the struct se_session pointer from the tail
360 * element of the per struct se_node_acl active session list.
362 if (list_empty(&se_nacl->acl_sess_list))
363 se_nacl->nacl_sess = NULL;
365 se_nacl->nacl_sess = container_of(
366 se_nacl->acl_sess_list.prev,
367 struct se_session, sess_acl_list);
369 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
372 EXPORT_SYMBOL(transport_deregister_session_configfs);
374 void transport_free_session(struct se_session *se_sess)
376 kmem_cache_free(se_sess_cache, se_sess);
378 EXPORT_SYMBOL(transport_free_session);
380 void transport_deregister_session(struct se_session *se_sess)
382 struct se_portal_group *se_tpg = se_sess->se_tpg;
383 struct se_node_acl *se_nacl;
387 transport_free_session(se_sess);
391 spin_lock_irqsave(&se_tpg->session_lock, flags);
392 list_del(&se_sess->sess_list);
393 se_sess->se_tpg = NULL;
394 se_sess->fabric_sess_ptr = NULL;
395 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
398 * Determine if we need to do extra work for this initiator node's
399 * struct se_node_acl if it had been previously dynamically generated.
401 se_nacl = se_sess->se_node_acl;
403 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
404 if (se_nacl->dynamic_node_acl) {
405 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
407 list_del(&se_nacl->acl_list);
408 se_tpg->num_node_acls--;
409 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
411 core_tpg_wait_for_nacl_pr_ref(se_nacl);
412 core_free_device_list_for_node(se_nacl, se_tpg);
413 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
415 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
418 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
421 transport_free_session(se_sess);
423 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
424 se_tpg->se_tpg_tfo->get_fabric_name());
426 EXPORT_SYMBOL(transport_deregister_session);
429 * Called with cmd->t_state_lock held.
431 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
433 struct se_device *dev = cmd->se_dev;
434 struct se_task *task;
440 list_for_each_entry(task, &cmd->t_task_list, t_list) {
441 if (task->task_flags & TF_ACTIVE)
444 if (!atomic_read(&task->task_state_active))
447 spin_lock_irqsave(&dev->execute_task_lock, flags);
448 list_del(&task->t_state_list);
449 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
450 cmd->se_tfo->get_task_tag(cmd), dev, task);
451 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
453 atomic_set(&task->task_state_active, 0);
454 atomic_dec(&cmd->t_task_cdbs_ex_left);
458 /* transport_cmd_check_stop():
460 * 'transport_off = 1' determines if t_transport_active should be cleared.
461 * 'transport_off = 2' determines if task_dev_state should be removed.
463 * A non-zero u8 t_state sets cmd->t_state.
464 * Returns 1 when command is stopped, else 0.
466 static int transport_cmd_check_stop(
473 spin_lock_irqsave(&cmd->t_state_lock, flags);
475 * Determine if IOCTL context caller in requesting the stopping of this
476 * command for LUN shutdown purposes.
478 if (atomic_read(&cmd->transport_lun_stop)) {
479 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
480 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
481 cmd->se_tfo->get_task_tag(cmd));
483 cmd->deferred_t_state = cmd->t_state;
484 cmd->t_state = TRANSPORT_DEFERRED_CMD;
485 atomic_set(&cmd->t_transport_active, 0);
486 if (transport_off == 2)
487 transport_all_task_dev_remove_state(cmd);
488 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
490 complete(&cmd->transport_lun_stop_comp);
494 * Determine if frontend context caller is requesting the stopping of
495 * this command for frontend exceptions.
497 if (atomic_read(&cmd->t_transport_stop)) {
498 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
499 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
500 cmd->se_tfo->get_task_tag(cmd));
502 cmd->deferred_t_state = cmd->t_state;
503 cmd->t_state = TRANSPORT_DEFERRED_CMD;
504 if (transport_off == 2)
505 transport_all_task_dev_remove_state(cmd);
508 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
511 if (transport_off == 2)
513 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
515 complete(&cmd->t_transport_stop_comp);
519 atomic_set(&cmd->t_transport_active, 0);
520 if (transport_off == 2) {
521 transport_all_task_dev_remove_state(cmd);
523 * Clear struct se_cmd->se_lun before the transport_off == 2
524 * handoff to fabric module.
528 * Some fabric modules like tcm_loop can release
529 * their internally allocated I/O reference now and
532 if (cmd->se_tfo->check_stop_free != NULL) {
533 spin_unlock_irqrestore(
534 &cmd->t_state_lock, flags);
536 cmd->se_tfo->check_stop_free(cmd);
540 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
544 cmd->t_state = t_state;
545 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
550 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
552 return transport_cmd_check_stop(cmd, 2, 0);
555 static void transport_lun_remove_cmd(struct se_cmd *cmd)
557 struct se_lun *lun = cmd->se_lun;
563 spin_lock_irqsave(&cmd->t_state_lock, flags);
564 if (!atomic_read(&cmd->transport_dev_active)) {
565 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
568 atomic_set(&cmd->transport_dev_active, 0);
569 transport_all_task_dev_remove_state(cmd);
570 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
574 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
575 if (atomic_read(&cmd->transport_lun_active)) {
576 list_del(&cmd->se_lun_node);
577 atomic_set(&cmd->transport_lun_active, 0);
579 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
580 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
583 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
586 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
588 if (!cmd->se_tmr_req)
589 transport_lun_remove_cmd(cmd);
591 if (transport_cmd_check_stop_to_fabric(cmd))
594 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
595 transport_put_cmd(cmd);
599 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
602 struct se_device *dev = cmd->se_dev;
603 struct se_queue_obj *qobj = &dev->dev_queue_obj;
607 spin_lock_irqsave(&cmd->t_state_lock, flags);
608 cmd->t_state = t_state;
609 atomic_set(&cmd->t_transport_active, 1);
610 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
613 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
615 /* If the cmd is already on the list, remove it before we add it */
616 if (!list_empty(&cmd->se_queue_node))
617 list_del(&cmd->se_queue_node);
619 atomic_inc(&qobj->queue_cnt);
622 list_add(&cmd->se_queue_node, &qobj->qobj_list);
624 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
625 atomic_set(&cmd->t_transport_queue_active, 1);
626 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
628 wake_up_interruptible(&qobj->thread_wq);
631 static struct se_cmd *
632 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
637 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
638 if (list_empty(&qobj->qobj_list)) {
639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
642 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
644 atomic_set(&cmd->t_transport_queue_active, 0);
646 list_del_init(&cmd->se_queue_node);
647 atomic_dec(&qobj->queue_cnt);
648 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
653 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
654 struct se_queue_obj *qobj)
658 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
659 if (!atomic_read(&cmd->t_transport_queue_active)) {
660 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
663 atomic_set(&cmd->t_transport_queue_active, 0);
664 atomic_dec(&qobj->queue_cnt);
665 list_del_init(&cmd->se_queue_node);
666 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
668 if (atomic_read(&cmd->t_transport_queue_active)) {
669 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
670 cmd->se_tfo->get_task_tag(cmd),
671 atomic_read(&cmd->t_transport_queue_active));
676 * Completion function used by TCM subsystem plugins (such as FILEIO)
677 * for queueing up response from struct se_subsystem_api->do_task()
679 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
681 struct se_task *task = list_entry(cmd->t_task_list.next,
682 struct se_task, t_list);
685 cmd->scsi_status = SAM_STAT_GOOD;
686 task->task_scsi_status = GOOD;
688 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
689 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
690 task->task_se_cmd->transport_error_status =
691 PYX_TRANSPORT_ILLEGAL_REQUEST;
694 transport_complete_task(task, good);
696 EXPORT_SYMBOL(transport_complete_sync_cache);
698 /* transport_complete_task():
700 * Called from interrupt and non interrupt context depending
701 * on the transport plugin.
703 void transport_complete_task(struct se_task *task, int success)
705 struct se_cmd *cmd = task->task_se_cmd;
706 struct se_device *dev = cmd->se_dev;
710 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
711 cmd->t_task_cdb[0], dev);
714 atomic_inc(&dev->depth_left);
716 spin_lock_irqsave(&cmd->t_state_lock, flags);
717 task->task_flags &= ~TF_ACTIVE;
720 * See if any sense data exists, if so set the TASK_SENSE flag.
721 * Also check for any other post completion work that needs to be
722 * done by the plugins.
724 if (dev && dev->transport->transport_complete) {
725 if (dev->transport->transport_complete(task) != 0) {
726 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
727 task->task_sense = 1;
733 * See if we are waiting for outstanding struct se_task
734 * to complete for an exception condition
736 if (task->task_flags & TF_REQUEST_STOP) {
738 * Decrement cmd->t_se_count if this task had
739 * previously thrown its timeout exception handler.
741 if (task->task_flags & TF_TIMEOUT) {
742 atomic_dec(&cmd->t_se_count);
743 task->task_flags &= ~TF_TIMEOUT;
745 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
747 complete(&task->task_stop_comp);
751 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
752 * left counter to determine when the struct se_cmd is ready to be queued to
753 * the processing thread.
755 if (task->task_flags & TF_TIMEOUT) {
756 if (!atomic_dec_and_test(
757 &cmd->t_task_cdbs_timeout_left)) {
758 spin_unlock_irqrestore(&cmd->t_state_lock,
762 t_state = TRANSPORT_COMPLETE_TIMEOUT;
763 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
765 transport_add_cmd_to_queue(cmd, t_state, false);
768 atomic_dec(&cmd->t_task_cdbs_timeout_left);
771 * Decrement the outstanding t_task_cdbs_left count. The last
772 * struct se_task from struct se_cmd will complete itself into the
773 * device queue depending upon int success.
775 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
777 cmd->t_tasks_failed = 1;
779 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
783 if (!success || cmd->t_tasks_failed) {
784 t_state = TRANSPORT_COMPLETE_FAILURE;
785 if (!task->task_error_status) {
786 task->task_error_status =
787 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
788 cmd->transport_error_status =
789 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
792 atomic_set(&cmd->t_transport_complete, 1);
793 t_state = TRANSPORT_COMPLETE_OK;
795 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
797 transport_add_cmd_to_queue(cmd, t_state, false);
799 EXPORT_SYMBOL(transport_complete_task);
802 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
803 * struct se_task list are ready to be added to the active execution list
806 * Called with se_dev_t->execute_task_lock called.
808 static inline int transport_add_task_check_sam_attr(
809 struct se_task *task,
810 struct se_task *task_prev,
811 struct se_device *dev)
814 * No SAM Task attribute emulation enabled, add to tail of
817 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
818 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
822 * HEAD_OF_QUEUE attribute for received CDB, which means
823 * the first task that is associated with a struct se_cmd goes to
824 * head of the struct se_device->execute_task_list, and task_prev
825 * after that for each subsequent task
827 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
828 list_add(&task->t_execute_list,
829 (task_prev != NULL) ?
830 &task_prev->t_execute_list :
831 &dev->execute_task_list);
833 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
834 " in execution queue\n",
835 task->task_se_cmd->t_task_cdb[0]);
839 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
840 * transitioned from Dermant -> Active state, and are added to the end
841 * of the struct se_device->execute_task_list
843 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
847 /* __transport_add_task_to_execute_queue():
849 * Called with se_dev_t->execute_task_lock called.
851 static void __transport_add_task_to_execute_queue(
852 struct se_task *task,
853 struct se_task *task_prev,
854 struct se_device *dev)
858 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
859 atomic_inc(&dev->execute_tasks);
861 if (atomic_read(&task->task_state_active))
864 * Determine if this task needs to go to HEAD_OF_QUEUE for the
865 * state list as well. Running with SAM Task Attribute emulation
866 * will always return head_of_queue == 0 here
869 list_add(&task->t_state_list, (task_prev) ?
870 &task_prev->t_state_list :
871 &dev->state_task_list);
873 list_add_tail(&task->t_state_list, &dev->state_task_list);
875 atomic_set(&task->task_state_active, 1);
877 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
878 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
882 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
884 struct se_device *dev = cmd->se_dev;
885 struct se_task *task;
888 spin_lock_irqsave(&cmd->t_state_lock, flags);
889 list_for_each_entry(task, &cmd->t_task_list, t_list) {
890 if (atomic_read(&task->task_state_active))
893 spin_lock(&dev->execute_task_lock);
894 list_add_tail(&task->t_state_list, &dev->state_task_list);
895 atomic_set(&task->task_state_active, 1);
897 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
898 task->task_se_cmd->se_tfo->get_task_tag(
899 task->task_se_cmd), task, dev);
901 spin_unlock(&dev->execute_task_lock);
903 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
906 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
908 struct se_device *dev = cmd->se_dev;
909 struct se_task *task, *task_prev = NULL;
912 spin_lock_irqsave(&dev->execute_task_lock, flags);
913 list_for_each_entry(task, &cmd->t_task_list, t_list) {
914 if (!list_empty(&task->t_execute_list))
917 * __transport_add_task_to_execute_queue() handles the
918 * SAM Task Attribute emulation if enabled
920 __transport_add_task_to_execute_queue(task, task_prev, dev);
923 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
926 void __transport_remove_task_from_execute_queue(struct se_task *task,
927 struct se_device *dev)
929 list_del_init(&task->t_execute_list);
930 atomic_dec(&dev->execute_tasks);
933 void transport_remove_task_from_execute_queue(
934 struct se_task *task,
935 struct se_device *dev)
939 if (WARN_ON(list_empty(&task->t_execute_list)))
942 spin_lock_irqsave(&dev->execute_task_lock, flags);
943 __transport_remove_task_from_execute_queue(task, dev);
944 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
948 * Handle QUEUE_FULL / -EAGAIN status
951 static void target_qf_do_work(struct work_struct *work)
953 struct se_device *dev = container_of(work, struct se_device,
955 LIST_HEAD(qf_cmd_list);
956 struct se_cmd *cmd, *cmd_tmp;
958 spin_lock_irq(&dev->qf_cmd_lock);
959 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
960 spin_unlock_irq(&dev->qf_cmd_lock);
962 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
963 list_del(&cmd->se_qf_node);
964 atomic_dec(&dev->dev_qf_count);
965 smp_mb__after_atomic_dec();
967 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
968 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
969 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
970 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
973 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
977 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
979 switch (cmd->data_direction) {
982 case DMA_FROM_DEVICE:
986 case DMA_BIDIRECTIONAL:
995 void transport_dump_dev_state(
996 struct se_device *dev,
1000 *bl += sprintf(b + *bl, "Status: ");
1001 switch (dev->dev_status) {
1002 case TRANSPORT_DEVICE_ACTIVATED:
1003 *bl += sprintf(b + *bl, "ACTIVATED");
1005 case TRANSPORT_DEVICE_DEACTIVATED:
1006 *bl += sprintf(b + *bl, "DEACTIVATED");
1008 case TRANSPORT_DEVICE_SHUTDOWN:
1009 *bl += sprintf(b + *bl, "SHUTDOWN");
1011 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1012 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1013 *bl += sprintf(b + *bl, "OFFLINE");
1016 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1020 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1021 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1023 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
1024 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1025 *bl += sprintf(b + *bl, " ");
1028 void transport_dump_vpd_proto_id(
1029 struct t10_vpd *vpd,
1030 unsigned char *p_buf,
1033 unsigned char buf[VPD_TMP_BUF_SIZE];
1036 memset(buf, 0, VPD_TMP_BUF_SIZE);
1037 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1039 switch (vpd->protocol_identifier) {
1041 sprintf(buf+len, "Fibre Channel\n");
1044 sprintf(buf+len, "Parallel SCSI\n");
1047 sprintf(buf+len, "SSA\n");
1050 sprintf(buf+len, "IEEE 1394\n");
1053 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1057 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1060 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1063 sprintf(buf+len, "Automation/Drive Interface Transport"
1067 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1070 sprintf(buf+len, "Unknown 0x%02x\n",
1071 vpd->protocol_identifier);
1076 strncpy(p_buf, buf, p_buf_len);
1078 pr_debug("%s", buf);
1082 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1085 * Check if the Protocol Identifier Valid (PIV) bit is set..
1087 * from spc3r23.pdf section 7.5.1
1089 if (page_83[1] & 0x80) {
1090 vpd->protocol_identifier = (page_83[0] & 0xf0);
1091 vpd->protocol_identifier_set = 1;
1092 transport_dump_vpd_proto_id(vpd, NULL, 0);
1095 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1097 int transport_dump_vpd_assoc(
1098 struct t10_vpd *vpd,
1099 unsigned char *p_buf,
1102 unsigned char buf[VPD_TMP_BUF_SIZE];
1106 memset(buf, 0, VPD_TMP_BUF_SIZE);
1107 len = sprintf(buf, "T10 VPD Identifier Association: ");
1109 switch (vpd->association) {
1111 sprintf(buf+len, "addressed logical unit\n");
1114 sprintf(buf+len, "target port\n");
1117 sprintf(buf+len, "SCSI target device\n");
1120 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1126 strncpy(p_buf, buf, p_buf_len);
1128 pr_debug("%s", buf);
1133 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1136 * The VPD identification association..
1138 * from spc3r23.pdf Section 7.6.3.1 Table 297
1140 vpd->association = (page_83[1] & 0x30);
1141 return transport_dump_vpd_assoc(vpd, NULL, 0);
1143 EXPORT_SYMBOL(transport_set_vpd_assoc);
1145 int transport_dump_vpd_ident_type(
1146 struct t10_vpd *vpd,
1147 unsigned char *p_buf,
1150 unsigned char buf[VPD_TMP_BUF_SIZE];
1154 memset(buf, 0, VPD_TMP_BUF_SIZE);
1155 len = sprintf(buf, "T10 VPD Identifier Type: ");
1157 switch (vpd->device_identifier_type) {
1159 sprintf(buf+len, "Vendor specific\n");
1162 sprintf(buf+len, "T10 Vendor ID based\n");
1165 sprintf(buf+len, "EUI-64 based\n");
1168 sprintf(buf+len, "NAA\n");
1171 sprintf(buf+len, "Relative target port identifier\n");
1174 sprintf(buf+len, "SCSI name string\n");
1177 sprintf(buf+len, "Unsupported: 0x%02x\n",
1178 vpd->device_identifier_type);
1184 if (p_buf_len < strlen(buf)+1)
1186 strncpy(p_buf, buf, p_buf_len);
1188 pr_debug("%s", buf);
1194 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1197 * The VPD identifier type..
1199 * from spc3r23.pdf Section 7.6.3.1 Table 298
1201 vpd->device_identifier_type = (page_83[1] & 0x0f);
1202 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1204 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1206 int transport_dump_vpd_ident(
1207 struct t10_vpd *vpd,
1208 unsigned char *p_buf,
1211 unsigned char buf[VPD_TMP_BUF_SIZE];
1214 memset(buf, 0, VPD_TMP_BUF_SIZE);
1216 switch (vpd->device_identifier_code_set) {
1217 case 0x01: /* Binary */
1218 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1219 &vpd->device_identifier[0]);
1221 case 0x02: /* ASCII */
1222 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1223 &vpd->device_identifier[0]);
1225 case 0x03: /* UTF-8 */
1226 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1227 &vpd->device_identifier[0]);
1230 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1231 " 0x%02x", vpd->device_identifier_code_set);
1237 strncpy(p_buf, buf, p_buf_len);
1239 pr_debug("%s", buf);
1245 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1247 static const char hex_str[] = "0123456789abcdef";
1248 int j = 0, i = 4; /* offset to start of the identifer */
1251 * The VPD Code Set (encoding)
1253 * from spc3r23.pdf Section 7.6.3.1 Table 296
1255 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1256 switch (vpd->device_identifier_code_set) {
1257 case 0x01: /* Binary */
1258 vpd->device_identifier[j++] =
1259 hex_str[vpd->device_identifier_type];
1260 while (i < (4 + page_83[3])) {
1261 vpd->device_identifier[j++] =
1262 hex_str[(page_83[i] & 0xf0) >> 4];
1263 vpd->device_identifier[j++] =
1264 hex_str[page_83[i] & 0x0f];
1268 case 0x02: /* ASCII */
1269 case 0x03: /* UTF-8 */
1270 while (i < (4 + page_83[3]))
1271 vpd->device_identifier[j++] = page_83[i++];
1277 return transport_dump_vpd_ident(vpd, NULL, 0);
1279 EXPORT_SYMBOL(transport_set_vpd_ident);
1281 static void core_setup_task_attr_emulation(struct se_device *dev)
1284 * If this device is from Target_Core_Mod/pSCSI, disable the
1285 * SAM Task Attribute emulation.
1287 * This is currently not available in upsream Linux/SCSI Target
1288 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1290 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1291 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1295 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1296 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1297 " device\n", dev->transport->name,
1298 dev->transport->get_device_rev(dev));
1301 static void scsi_dump_inquiry(struct se_device *dev)
1303 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1306 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1308 pr_debug(" Vendor: ");
1309 for (i = 0; i < 8; i++)
1310 if (wwn->vendor[i] >= 0x20)
1311 pr_debug("%c", wwn->vendor[i]);
1315 pr_debug(" Model: ");
1316 for (i = 0; i < 16; i++)
1317 if (wwn->model[i] >= 0x20)
1318 pr_debug("%c", wwn->model[i]);
1322 pr_debug(" Revision: ");
1323 for (i = 0; i < 4; i++)
1324 if (wwn->revision[i] >= 0x20)
1325 pr_debug("%c", wwn->revision[i]);
1331 device_type = dev->transport->get_device_type(dev);
1332 pr_debug(" Type: %s ", scsi_device_type(device_type));
1333 pr_debug(" ANSI SCSI revision: %02x\n",
1334 dev->transport->get_device_rev(dev));
1337 struct se_device *transport_add_device_to_core_hba(
1339 struct se_subsystem_api *transport,
1340 struct se_subsystem_dev *se_dev,
1342 void *transport_dev,
1343 struct se_dev_limits *dev_limits,
1344 const char *inquiry_prod,
1345 const char *inquiry_rev)
1348 struct se_device *dev;
1350 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1352 pr_err("Unable to allocate memory for se_dev_t\n");
1356 transport_init_queue_obj(&dev->dev_queue_obj);
1357 dev->dev_flags = device_flags;
1358 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1359 dev->dev_ptr = transport_dev;
1361 dev->se_sub_dev = se_dev;
1362 dev->transport = transport;
1363 atomic_set(&dev->active_cmds, 0);
1364 INIT_LIST_HEAD(&dev->dev_list);
1365 INIT_LIST_HEAD(&dev->dev_sep_list);
1366 INIT_LIST_HEAD(&dev->dev_tmr_list);
1367 INIT_LIST_HEAD(&dev->execute_task_list);
1368 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1369 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1370 INIT_LIST_HEAD(&dev->state_task_list);
1371 INIT_LIST_HEAD(&dev->qf_cmd_list);
1372 spin_lock_init(&dev->execute_task_lock);
1373 spin_lock_init(&dev->delayed_cmd_lock);
1374 spin_lock_init(&dev->ordered_cmd_lock);
1375 spin_lock_init(&dev->state_task_lock);
1376 spin_lock_init(&dev->dev_alua_lock);
1377 spin_lock_init(&dev->dev_reservation_lock);
1378 spin_lock_init(&dev->dev_status_lock);
1379 spin_lock_init(&dev->dev_status_thr_lock);
1380 spin_lock_init(&dev->se_port_lock);
1381 spin_lock_init(&dev->se_tmr_lock);
1382 spin_lock_init(&dev->qf_cmd_lock);
1384 dev->queue_depth = dev_limits->queue_depth;
1385 atomic_set(&dev->depth_left, dev->queue_depth);
1386 atomic_set(&dev->dev_ordered_id, 0);
1388 se_dev_set_default_attribs(dev, dev_limits);
1390 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1391 dev->creation_time = get_jiffies_64();
1392 spin_lock_init(&dev->stats_lock);
1394 spin_lock(&hba->device_lock);
1395 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1397 spin_unlock(&hba->device_lock);
1399 * Setup the SAM Task Attribute emulation for struct se_device
1401 core_setup_task_attr_emulation(dev);
1403 * Force PR and ALUA passthrough emulation with internal object use.
1405 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1407 * Setup the Reservations infrastructure for struct se_device
1409 core_setup_reservations(dev, force_pt);
1411 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1413 if (core_setup_alua(dev, force_pt) < 0)
1417 * Startup the struct se_device processing thread
1419 dev->process_thread = kthread_run(transport_processing_thread, dev,
1420 "LIO_%s", dev->transport->name);
1421 if (IS_ERR(dev->process_thread)) {
1422 pr_err("Unable to create kthread: LIO_%s\n",
1423 dev->transport->name);
1427 * Setup work_queue for QUEUE_FULL
1429 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1431 * Preload the initial INQUIRY const values if we are doing
1432 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1433 * passthrough because this is being provided by the backend LLD.
1434 * This is required so that transport_get_inquiry() copies these
1435 * originals once back into DEV_T10_WWN(dev) for the virtual device
1438 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1439 if (!inquiry_prod || !inquiry_rev) {
1440 pr_err("All non TCM/pSCSI plugins require"
1441 " INQUIRY consts\n");
1445 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1446 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1447 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1449 scsi_dump_inquiry(dev);
1453 kthread_stop(dev->process_thread);
1455 spin_lock(&hba->device_lock);
1456 list_del(&dev->dev_list);
1458 spin_unlock(&hba->device_lock);
1460 se_release_vpd_for_dev(dev);
1466 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1468 /* transport_generic_prepare_cdb():
1470 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1471 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1472 * The point of this is since we are mapping iSCSI LUNs to
1473 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1474 * devices and HBAs for a loop.
1476 static inline void transport_generic_prepare_cdb(
1480 case READ_10: /* SBC - RDProtect */
1481 case READ_12: /* SBC - RDProtect */
1482 case READ_16: /* SBC - RDProtect */
1483 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1484 case VERIFY: /* SBC - VRProtect */
1485 case VERIFY_16: /* SBC - VRProtect */
1486 case WRITE_VERIFY: /* SBC - VRProtect */
1487 case WRITE_VERIFY_12: /* SBC - VRProtect */
1490 cdb[1] &= 0x1f; /* clear logical unit number */
1495 static struct se_task *
1496 transport_generic_get_task(struct se_cmd *cmd,
1497 enum dma_data_direction data_direction)
1499 struct se_task *task;
1500 struct se_device *dev = cmd->se_dev;
1502 task = dev->transport->alloc_task(cmd->t_task_cdb);
1504 pr_err("Unable to allocate struct se_task\n");
1508 INIT_LIST_HEAD(&task->t_list);
1509 INIT_LIST_HEAD(&task->t_execute_list);
1510 INIT_LIST_HEAD(&task->t_state_list);
1511 init_completion(&task->task_stop_comp);
1512 task->task_se_cmd = cmd;
1513 task->task_data_direction = data_direction;
1518 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1521 * Used by fabric modules containing a local struct se_cmd within their
1522 * fabric dependent per I/O descriptor.
1524 void transport_init_se_cmd(
1526 struct target_core_fabric_ops *tfo,
1527 struct se_session *se_sess,
1531 unsigned char *sense_buffer)
1533 INIT_LIST_HEAD(&cmd->se_lun_node);
1534 INIT_LIST_HEAD(&cmd->se_delayed_node);
1535 INIT_LIST_HEAD(&cmd->se_ordered_node);
1536 INIT_LIST_HEAD(&cmd->se_qf_node);
1537 INIT_LIST_HEAD(&cmd->se_queue_node);
1539 INIT_LIST_HEAD(&cmd->t_task_list);
1540 init_completion(&cmd->transport_lun_fe_stop_comp);
1541 init_completion(&cmd->transport_lun_stop_comp);
1542 init_completion(&cmd->t_transport_stop_comp);
1543 spin_lock_init(&cmd->t_state_lock);
1544 atomic_set(&cmd->transport_dev_active, 1);
1547 cmd->se_sess = se_sess;
1548 cmd->data_length = data_length;
1549 cmd->data_direction = data_direction;
1550 cmd->sam_task_attr = task_attr;
1551 cmd->sense_buffer = sense_buffer;
1553 EXPORT_SYMBOL(transport_init_se_cmd);
1555 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1558 * Check if SAM Task Attribute emulation is enabled for this
1559 * struct se_device storage object
1561 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1564 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1565 pr_debug("SAM Task Attribute ACA"
1566 " emulation is not supported\n");
1570 * Used to determine when ORDERED commands should go from
1571 * Dormant to Active status.
1573 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1574 smp_mb__after_atomic_inc();
1575 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1576 cmd->se_ordered_id, cmd->sam_task_attr,
1577 cmd->se_dev->transport->name);
1581 /* transport_generic_allocate_tasks():
1583 * Called from fabric RX Thread.
1585 int transport_generic_allocate_tasks(
1591 transport_generic_prepare_cdb(cdb);
1593 * Ensure that the received CDB is less than the max (252 + 8) bytes
1594 * for VARIABLE_LENGTH_CMD
1596 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1597 pr_err("Received SCSI CDB with command_size: %d that"
1598 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1599 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1603 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1604 * allocate the additional extended CDB buffer now.. Otherwise
1605 * setup the pointer from __t_task_cdb to t_task_cdb.
1607 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1608 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1610 if (!cmd->t_task_cdb) {
1611 pr_err("Unable to allocate cmd->t_task_cdb"
1612 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1613 scsi_command_size(cdb),
1614 (unsigned long)sizeof(cmd->__t_task_cdb));
1618 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1620 * Copy the original CDB into cmd->
1622 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1624 * Setup the received CDB based on SCSI defined opcodes and
1625 * perform unit attention, persistent reservations and ALUA
1626 * checks for virtual device backends. The cmd->t_task_cdb
1627 * pointer is expected to be setup before we reach this point.
1629 ret = transport_generic_cmd_sequencer(cmd, cdb);
1633 * Check for SAM Task Attribute Emulation
1635 if (transport_check_alloc_task_attr(cmd) < 0) {
1636 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1637 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1640 spin_lock(&cmd->se_lun->lun_sep_lock);
1641 if (cmd->se_lun->lun_sep)
1642 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1643 spin_unlock(&cmd->se_lun->lun_sep_lock);
1646 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1648 static void transport_generic_request_failure(struct se_cmd *,
1649 struct se_device *, int, int);
1651 * Used by fabric module frontends to queue tasks directly.
1652 * Many only be used from process context only
1654 int transport_handle_cdb_direct(
1661 pr_err("cmd->se_lun is NULL\n");
1664 if (in_interrupt()) {
1666 pr_err("transport_generic_handle_cdb cannot be called"
1667 " from interrupt context\n");
1671 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1672 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1673 * in existing usage to ensure that outstanding descriptors are handled
1674 * correctly during shutdown via transport_wait_for_tasks()
1676 * Also, we don't take cmd->t_state_lock here as we only expect
1677 * this to be called for initial descriptor submission.
1679 cmd->t_state = TRANSPORT_NEW_CMD;
1680 atomic_set(&cmd->t_transport_active, 1);
1682 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1683 * so follow TRANSPORT_NEW_CMD processing thread context usage
1684 * and call transport_generic_request_failure() if necessary..
1686 ret = transport_generic_new_cmd(cmd);
1690 cmd->transport_error_status = ret;
1691 transport_generic_request_failure(cmd, NULL, 0,
1692 (cmd->data_direction != DMA_TO_DEVICE));
1696 EXPORT_SYMBOL(transport_handle_cdb_direct);
1699 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1700 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1701 * complete setup in TCM process context w/ TFO->new_cmd_map().
1703 int transport_generic_handle_cdb_map(
1708 pr_err("cmd->se_lun is NULL\n");
1712 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1715 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1717 /* transport_generic_handle_data():
1721 int transport_generic_handle_data(
1725 * For the software fabric case, then we assume the nexus is being
1726 * failed/shutdown when signals are pending from the kthread context
1727 * caller, so we return a failure. For the HW target mode case running
1728 * in interrupt code, the signal_pending() check is skipped.
1730 if (!in_interrupt() && signal_pending(current))
1733 * If the received CDB has aleady been ABORTED by the generic
1734 * target engine, we now call transport_check_aborted_status()
1735 * to queue any delated TASK_ABORTED status for the received CDB to the
1736 * fabric module as we are expecting no further incoming DATA OUT
1737 * sequences at this point.
1739 if (transport_check_aborted_status(cmd, 1) != 0)
1742 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1745 EXPORT_SYMBOL(transport_generic_handle_data);
1747 /* transport_generic_handle_tmr():
1751 int transport_generic_handle_tmr(
1754 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1757 EXPORT_SYMBOL(transport_generic_handle_tmr);
1759 void transport_generic_free_cmd_intr(
1762 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
1764 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1766 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1768 struct se_task *task, *task_tmp;
1769 unsigned long flags;
1772 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1773 cmd->se_tfo->get_task_tag(cmd));
1776 * No tasks remain in the execution queue
1778 spin_lock_irqsave(&cmd->t_state_lock, flags);
1779 list_for_each_entry_safe(task, task_tmp,
1780 &cmd->t_task_list, t_list) {
1781 pr_debug("Processing task %p\n", task);
1783 * If the struct se_task has not been sent and is not active,
1784 * remove the struct se_task from the execution queue.
1786 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1787 spin_unlock_irqrestore(&cmd->t_state_lock,
1789 transport_remove_task_from_execute_queue(task,
1792 pr_debug("Task %p removed from execute queue\n", task);
1793 spin_lock_irqsave(&cmd->t_state_lock, flags);
1798 * If the struct se_task is active, sleep until it is returned
1801 if (task->task_flags & TF_ACTIVE) {
1802 task->task_flags |= TF_REQUEST_STOP;
1803 spin_unlock_irqrestore(&cmd->t_state_lock,
1806 pr_debug("Task %p waiting to complete\n", task);
1807 wait_for_completion(&task->task_stop_comp);
1808 pr_debug("Task %p stopped successfully\n", task);
1810 spin_lock_irqsave(&cmd->t_state_lock, flags);
1811 atomic_dec(&cmd->t_task_cdbs_left);
1812 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1814 pr_debug("Task %p - did nothing\n", task);
1818 __transport_stop_task_timer(task, &flags);
1820 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1826 * Handle SAM-esque emulation for generic transport request failures.
1828 static void transport_generic_request_failure(
1830 struct se_device *dev,
1836 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1837 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1838 cmd->t_task_cdb[0]);
1839 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1840 " %d/%d transport_error_status: %d\n",
1841 cmd->se_tfo->get_cmd_state(cmd),
1842 cmd->t_state, cmd->deferred_t_state,
1843 cmd->transport_error_status);
1844 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1845 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1846 " t_transport_active: %d t_transport_stop: %d"
1847 " t_transport_sent: %d\n", cmd->t_task_list_num,
1848 atomic_read(&cmd->t_task_cdbs_left),
1849 atomic_read(&cmd->t_task_cdbs_sent),
1850 atomic_read(&cmd->t_task_cdbs_ex_left),
1851 atomic_read(&cmd->t_transport_active),
1852 atomic_read(&cmd->t_transport_stop),
1853 atomic_read(&cmd->t_transport_sent));
1855 transport_stop_all_task_timers(cmd);
1858 atomic_inc(&dev->depth_left);
1860 * For SAM Task Attribute emulation for failed struct se_cmd
1862 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1863 transport_complete_task_attr(cmd);
1866 transport_direct_request_timeout(cmd);
1867 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1870 switch (cmd->transport_error_status) {
1871 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1872 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1874 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1875 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1877 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1878 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1880 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1881 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1883 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1885 transport_new_cmd_failure(cmd);
1887 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1888 * we force this session to fall back to session
1891 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1892 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1895 case PYX_TRANSPORT_LU_COMM_FAILURE:
1896 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1897 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1899 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1900 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1902 case PYX_TRANSPORT_WRITE_PROTECTED:
1903 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1905 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1907 * No SENSE Data payload for this case, set SCSI Status
1908 * and queue the response to $FABRIC_MOD.
1910 * Uses linux/include/scsi/scsi.h SAM status codes defs
1912 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1914 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1915 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1918 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1921 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1922 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1923 cmd->orig_fe_lun, 0x2C,
1924 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1926 ret = cmd->se_tfo->queue_status(cmd);
1930 case PYX_TRANSPORT_USE_SENSE_REASON:
1932 * struct se_cmd->scsi_sense_reason already set
1936 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1938 cmd->transport_error_status);
1939 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1943 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1944 * make the call to transport_send_check_condition_and_sense()
1945 * directly. Otherwise expect the fabric to make the call to
1946 * transport_send_check_condition_and_sense() after handling
1947 * possible unsoliticied write data payloads.
1949 if (!sc && !cmd->se_tfo->new_cmd_map)
1950 transport_new_cmd_failure(cmd);
1952 ret = transport_send_check_condition_and_sense(cmd,
1953 cmd->scsi_sense_reason, 0);
1959 transport_lun_remove_cmd(cmd);
1960 if (!transport_cmd_check_stop_to_fabric(cmd))
1965 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1966 transport_handle_queue_full(cmd, cmd->se_dev);
1969 static void transport_direct_request_timeout(struct se_cmd *cmd)
1971 unsigned long flags;
1973 spin_lock_irqsave(&cmd->t_state_lock, flags);
1974 if (!atomic_read(&cmd->t_transport_timeout)) {
1975 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1978 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
1979 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1983 atomic_sub(atomic_read(&cmd->t_transport_timeout),
1985 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1988 static void transport_generic_request_timeout(struct se_cmd *cmd)
1990 unsigned long flags;
1993 * Reset cmd->t_se_count to allow transport_put_cmd()
1994 * to allow last call to free memory resources.
1996 spin_lock_irqsave(&cmd->t_state_lock, flags);
1997 if (atomic_read(&cmd->t_transport_timeout) > 1) {
1998 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
2000 atomic_sub(tmp, &cmd->t_se_count);
2002 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2004 transport_put_cmd(cmd);
2007 static inline u32 transport_lba_21(unsigned char *cdb)
2009 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2012 static inline u32 transport_lba_32(unsigned char *cdb)
2014 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2017 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2019 unsigned int __v1, __v2;
2021 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2022 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2024 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2028 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2030 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2032 unsigned int __v1, __v2;
2034 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2035 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2037 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2040 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2042 unsigned long flags;
2044 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2045 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2046 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2050 * Called from interrupt context.
2052 static void transport_task_timeout_handler(unsigned long data)
2054 struct se_task *task = (struct se_task *)data;
2055 struct se_cmd *cmd = task->task_se_cmd;
2056 unsigned long flags;
2058 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2060 spin_lock_irqsave(&cmd->t_state_lock, flags);
2061 if (task->task_flags & TF_TIMER_STOP) {
2062 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2065 task->task_flags &= ~TF_TIMER_RUNNING;
2068 * Determine if transport_complete_task() has already been called.
2070 if (!(task->task_flags & TF_ACTIVE)) {
2071 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2073 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2077 atomic_inc(&cmd->t_se_count);
2078 atomic_inc(&cmd->t_transport_timeout);
2079 cmd->t_tasks_failed = 1;
2081 task->task_flags |= TF_TIMEOUT;
2082 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2083 task->task_scsi_status = 1;
2085 if (task->task_flags & TF_REQUEST_STOP) {
2086 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2087 " == 1\n", task, cmd);
2088 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2089 complete(&task->task_stop_comp);
2093 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2094 pr_debug("transport task: %p cmd: %p timeout non zero"
2095 " t_task_cdbs_left\n", task, cmd);
2096 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2099 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2102 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
2103 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2105 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE, false);
2109 * Called with cmd->t_state_lock held.
2111 static void transport_start_task_timer(struct se_task *task)
2113 struct se_device *dev = task->task_se_cmd->se_dev;
2116 if (task->task_flags & TF_TIMER_RUNNING)
2119 * If the task_timeout is disabled, exit now.
2121 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
2125 init_timer(&task->task_timer);
2126 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2127 task->task_timer.data = (unsigned long) task;
2128 task->task_timer.function = transport_task_timeout_handler;
2130 task->task_flags |= TF_TIMER_RUNNING;
2131 add_timer(&task->task_timer);
2133 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2134 " %d\n", task->task_se_cmd, task, timeout);
2139 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2141 void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2143 struct se_cmd *cmd = task->task_se_cmd;
2145 if (!(task->task_flags & TF_TIMER_RUNNING))
2148 task->task_flags |= TF_TIMER_STOP;
2149 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
2151 del_timer_sync(&task->task_timer);
2153 spin_lock_irqsave(&cmd->t_state_lock, *flags);
2154 task->task_flags &= ~TF_TIMER_RUNNING;
2155 task->task_flags &= ~TF_TIMER_STOP;
2158 static void transport_stop_all_task_timers(struct se_cmd *cmd)
2160 struct se_task *task = NULL, *task_tmp;
2161 unsigned long flags;
2163 spin_lock_irqsave(&cmd->t_state_lock, flags);
2164 list_for_each_entry_safe(task, task_tmp,
2165 &cmd->t_task_list, t_list)
2166 __transport_stop_task_timer(task, &flags);
2167 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2170 static inline int transport_tcq_window_closed(struct se_device *dev)
2172 if (dev->dev_tcq_window_closed++ <
2173 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2174 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2176 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2178 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2183 * Called from Fabric Module context from transport_execute_tasks()
2185 * The return of this function determins if the tasks from struct se_cmd
2186 * get added to the execution queue in transport_execute_tasks(),
2187 * or are added to the delayed or ordered lists here.
2189 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2191 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2194 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2195 * to allow the passed struct se_cmd list of tasks to the front of the list.
2197 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2198 atomic_inc(&cmd->se_dev->dev_hoq_count);
2199 smp_mb__after_atomic_inc();
2200 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2201 " 0x%02x, se_ordered_id: %u\n",
2203 cmd->se_ordered_id);
2205 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2206 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2207 list_add_tail(&cmd->se_ordered_node,
2208 &cmd->se_dev->ordered_cmd_list);
2209 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2211 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2212 smp_mb__after_atomic_inc();
2214 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2215 " list, se_ordered_id: %u\n",
2217 cmd->se_ordered_id);
2219 * Add ORDERED command to tail of execution queue if
2220 * no other older commands exist that need to be
2223 if (!atomic_read(&cmd->se_dev->simple_cmds))
2227 * For SIMPLE and UNTAGGED Task Attribute commands
2229 atomic_inc(&cmd->se_dev->simple_cmds);
2230 smp_mb__after_atomic_inc();
2233 * Otherwise if one or more outstanding ORDERED task attribute exist,
2234 * add the dormant task(s) built for the passed struct se_cmd to the
2235 * execution queue and become in Active state for this struct se_device.
2237 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2239 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2240 * will be drained upon completion of HEAD_OF_QUEUE task.
2242 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2243 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2244 list_add_tail(&cmd->se_delayed_node,
2245 &cmd->se_dev->delayed_cmd_list);
2246 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2248 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2249 " delayed CMD list, se_ordered_id: %u\n",
2250 cmd->t_task_cdb[0], cmd->sam_task_attr,
2251 cmd->se_ordered_id);
2253 * Return zero to let transport_execute_tasks() know
2254 * not to add the delayed tasks to the execution list.
2259 * Otherwise, no ORDERED task attributes exist..
2265 * Called from fabric module context in transport_generic_new_cmd() and
2266 * transport_generic_process_write()
2268 static int transport_execute_tasks(struct se_cmd *cmd)
2272 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2273 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2274 transport_generic_request_failure(cmd, NULL, 0, 1);
2279 * Call transport_cmd_check_stop() to see if a fabric exception
2280 * has occurred that prevents execution.
2282 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2284 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2285 * attribute for the tasks of the received struct se_cmd CDB
2287 add_tasks = transport_execute_task_attr(cmd);
2291 * This calls transport_add_tasks_from_cmd() to handle
2292 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2293 * (if enabled) in __transport_add_task_to_execute_queue() and
2294 * transport_add_task_check_sam_attr().
2296 transport_add_tasks_from_cmd(cmd);
2299 * Kick the execution queue for the cmd associated struct se_device
2303 __transport_execute_tasks(cmd->se_dev);
2308 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2309 * from struct se_device->execute_task_list and
2311 * Called from transport_processing_thread()
2313 static int __transport_execute_tasks(struct se_device *dev)
2316 struct se_cmd *cmd = NULL;
2317 struct se_task *task = NULL;
2318 unsigned long flags;
2321 * Check if there is enough room in the device and HBA queue to send
2322 * struct se_tasks to the selected transport.
2325 if (!atomic_read(&dev->depth_left))
2326 return transport_tcq_window_closed(dev);
2328 dev->dev_tcq_window_closed = 0;
2330 spin_lock_irq(&dev->execute_task_lock);
2331 if (list_empty(&dev->execute_task_list)) {
2332 spin_unlock_irq(&dev->execute_task_lock);
2335 task = list_first_entry(&dev->execute_task_list,
2336 struct se_task, t_execute_list);
2337 __transport_remove_task_from_execute_queue(task, dev);
2338 spin_unlock_irq(&dev->execute_task_lock);
2340 atomic_dec(&dev->depth_left);
2342 cmd = task->task_se_cmd;
2344 spin_lock_irqsave(&cmd->t_state_lock, flags);
2345 task->task_flags |= (TF_ACTIVE | TF_SENT);
2346 atomic_inc(&cmd->t_task_cdbs_sent);
2348 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2349 cmd->t_task_list_num)
2350 atomic_set(&cmd->transport_sent, 1);
2352 transport_start_task_timer(task);
2353 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2355 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2356 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2357 * struct se_subsystem_api->do_task() caller below.
2359 if (cmd->transport_emulate_cdb) {
2360 error = cmd->transport_emulate_cdb(cmd);
2362 cmd->transport_error_status = error;
2363 spin_lock_irqsave(&cmd->t_state_lock, flags);
2364 task->task_flags &= ~TF_ACTIVE;
2365 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2366 atomic_set(&cmd->transport_sent, 0);
2367 transport_stop_tasks_for_cmd(cmd);
2368 transport_generic_request_failure(cmd, dev, 0, 1);
2372 * Handle the successful completion for transport_emulate_cdb()
2373 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2374 * Otherwise the caller is expected to complete the task with
2377 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2378 cmd->scsi_status = SAM_STAT_GOOD;
2379 task->task_scsi_status = GOOD;
2380 transport_complete_task(task, 1);
2384 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2385 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2386 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2387 * LUN emulation code.
2389 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2390 * call ->do_task() directly and let the underlying TCM subsystem plugin
2391 * code handle the CDB emulation.
2393 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2394 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2395 error = transport_emulate_control_cdb(task);
2397 error = dev->transport->do_task(task);
2400 cmd->transport_error_status = error;
2401 spin_lock_irqsave(&cmd->t_state_lock, flags);
2402 task->task_flags &= ~TF_ACTIVE;
2403 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2404 atomic_set(&cmd->transport_sent, 0);
2405 transport_stop_tasks_for_cmd(cmd);
2406 transport_generic_request_failure(cmd, dev, 0, 1);
2415 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2417 unsigned long flags;
2419 * Any unsolicited data will get dumped for failed command inside of
2422 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2423 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2424 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2425 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2428 static inline u32 transport_get_sectors_6(
2433 struct se_device *dev = cmd->se_dev;
2436 * Assume TYPE_DISK for non struct se_device objects.
2437 * Use 8-bit sector value.
2443 * Use 24-bit allocation length for TYPE_TAPE.
2445 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2446 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2449 * Everything else assume TYPE_DISK Sector CDB location.
2450 * Use 8-bit sector value.
2456 static inline u32 transport_get_sectors_10(
2461 struct se_device *dev = cmd->se_dev;
2464 * Assume TYPE_DISK for non struct se_device objects.
2465 * Use 16-bit sector value.
2471 * XXX_10 is not defined in SSC, throw an exception
2473 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2479 * Everything else assume TYPE_DISK Sector CDB location.
2480 * Use 16-bit sector value.
2483 return (u32)(cdb[7] << 8) + cdb[8];
2486 static inline u32 transport_get_sectors_12(
2491 struct se_device *dev = cmd->se_dev;
2494 * Assume TYPE_DISK for non struct se_device objects.
2495 * Use 32-bit sector value.
2501 * XXX_12 is not defined in SSC, throw an exception
2503 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2509 * Everything else assume TYPE_DISK Sector CDB location.
2510 * Use 32-bit sector value.
2513 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2516 static inline u32 transport_get_sectors_16(
2521 struct se_device *dev = cmd->se_dev;
2524 * Assume TYPE_DISK for non struct se_device objects.
2525 * Use 32-bit sector value.
2531 * Use 24-bit allocation length for TYPE_TAPE.
2533 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2534 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2537 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2538 (cdb[12] << 8) + cdb[13];
2542 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2544 static inline u32 transport_get_sectors_32(
2550 * Assume TYPE_DISK for non struct se_device objects.
2551 * Use 32-bit sector value.
2553 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2554 (cdb[30] << 8) + cdb[31];
2558 static inline u32 transport_get_size(
2563 struct se_device *dev = cmd->se_dev;
2565 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2566 if (cdb[1] & 1) { /* sectors */
2567 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2572 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2573 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2574 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2575 dev->transport->name);
2577 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2580 static void transport_xor_callback(struct se_cmd *cmd)
2582 unsigned char *buf, *addr;
2583 struct scatterlist *sg;
2584 unsigned int offset;
2588 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2590 * 1) read the specified logical block(s);
2591 * 2) transfer logical blocks from the data-out buffer;
2592 * 3) XOR the logical blocks transferred from the data-out buffer with
2593 * the logical blocks read, storing the resulting XOR data in a buffer;
2594 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2595 * blocks transferred from the data-out buffer; and
2596 * 5) transfer the resulting XOR data to the data-in buffer.
2598 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2600 pr_err("Unable to allocate xor_callback buf\n");
2604 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2605 * into the locally allocated *buf
2607 sg_copy_to_buffer(cmd->t_data_sg,
2613 * Now perform the XOR against the BIDI read memory located at
2614 * cmd->t_mem_bidi_list
2618 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2619 addr = kmap_atomic(sg_page(sg), KM_USER0);
2623 for (i = 0; i < sg->length; i++)
2624 *(addr + sg->offset + i) ^= *(buf + offset + i);
2626 offset += sg->length;
2627 kunmap_atomic(addr, KM_USER0);
2635 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2637 static int transport_get_sense_data(struct se_cmd *cmd)
2639 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2640 struct se_device *dev = cmd->se_dev;
2641 struct se_task *task = NULL, *task_tmp;
2642 unsigned long flags;
2645 WARN_ON(!cmd->se_lun);
2650 spin_lock_irqsave(&cmd->t_state_lock, flags);
2651 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2652 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2656 list_for_each_entry_safe(task, task_tmp,
2657 &cmd->t_task_list, t_list) {
2658 if (!task->task_sense)
2661 if (!dev->transport->get_sense_buffer) {
2662 pr_err("dev->transport->get_sense_buffer"
2667 sense_buffer = dev->transport->get_sense_buffer(task);
2668 if (!sense_buffer) {
2669 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2670 " sense buffer for task with sense\n",
2671 cmd->se_tfo->get_task_tag(cmd), task);
2674 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2676 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2677 TRANSPORT_SENSE_BUFFER);
2679 memcpy(&buffer[offset], sense_buffer,
2680 TRANSPORT_SENSE_BUFFER);
2681 cmd->scsi_status = task->task_scsi_status;
2682 /* Automatically padded */
2683 cmd->scsi_sense_length =
2684 (TRANSPORT_SENSE_BUFFER + offset);
2686 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2688 dev->se_hba->hba_id, dev->transport->name,
2692 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2698 transport_handle_reservation_conflict(struct se_cmd *cmd)
2700 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2701 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2702 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2704 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2705 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2708 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2711 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2712 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2713 cmd->orig_fe_lun, 0x2C,
2714 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2718 static inline long long transport_dev_end_lba(struct se_device *dev)
2720 return dev->transport->get_blocks(dev) + 1;
2723 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2725 struct se_device *dev = cmd->se_dev;
2728 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2731 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2733 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2734 pr_err("LBA: %llu Sectors: %u exceeds"
2735 " transport_dev_end_lba(): %llu\n",
2736 cmd->t_task_lba, sectors,
2737 transport_dev_end_lba(dev));
2744 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2747 * Determine if the received WRITE_SAME is used to for direct
2748 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2749 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2750 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2752 int passthrough = (dev->transport->transport_type ==
2753 TRANSPORT_PLUGIN_PHBA_PDEV);
2756 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2757 pr_err("WRITE_SAME PBDATA and LBDATA"
2758 " bits not supported for Block Discard"
2763 * Currently for the emulated case we only accept
2764 * tpws with the UNMAP=1 bit set.
2766 if (!(flags[0] & 0x08)) {
2767 pr_err("WRITE_SAME w/o UNMAP bit not"
2768 " supported for Block Discard Emulation\n");
2776 /* transport_generic_cmd_sequencer():
2778 * Generic Command Sequencer that should work for most DAS transport
2781 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2784 * FIXME: Need to support other SCSI OPCODES where as well.
2786 static int transport_generic_cmd_sequencer(
2790 struct se_device *dev = cmd->se_dev;
2791 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2792 int ret = 0, sector_ret = 0, passthrough;
2793 u32 sectors = 0, size = 0, pr_reg_type = 0;
2797 * Check for an existing UNIT ATTENTION condition
2799 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2800 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2801 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2805 * Check status of Asymmetric Logical Unit Assignment port
2807 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2810 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2811 * The ALUA additional sense code qualifier (ASCQ) is determined
2812 * by the ALUA primary or secondary access state..
2816 pr_debug("[%s]: ALUA TG Port not available,"
2817 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2818 cmd->se_tfo->get_fabric_name(), alua_ascq);
2820 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2821 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2822 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2825 goto out_invalid_cdb_field;
2828 * Check status for SPC-3 Persistent Reservations
2830 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2831 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2832 cmd, cdb, pr_reg_type) != 0)
2833 return transport_handle_reservation_conflict(cmd);
2835 * This means the CDB is allowed for the SCSI Initiator port
2836 * when said port is *NOT* holding the legacy SPC-2 or
2837 * SPC-3 Persistent Reservation.
2843 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2845 goto out_unsupported_cdb;
2846 size = transport_get_size(sectors, cdb, cmd);
2847 cmd->t_task_lba = transport_lba_21(cdb);
2848 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2851 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2853 goto out_unsupported_cdb;
2854 size = transport_get_size(sectors, cdb, cmd);
2855 cmd->t_task_lba = transport_lba_32(cdb);
2856 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2859 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2861 goto out_unsupported_cdb;
2862 size = transport_get_size(sectors, cdb, cmd);
2863 cmd->t_task_lba = transport_lba_32(cdb);
2864 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2867 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2869 goto out_unsupported_cdb;
2870 size = transport_get_size(sectors, cdb, cmd);
2871 cmd->t_task_lba = transport_lba_64(cdb);
2872 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2875 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2877 goto out_unsupported_cdb;
2878 size = transport_get_size(sectors, cdb, cmd);
2879 cmd->t_task_lba = transport_lba_21(cdb);
2880 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2883 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2885 goto out_unsupported_cdb;
2886 size = transport_get_size(sectors, cdb, cmd);
2887 cmd->t_task_lba = transport_lba_32(cdb);
2888 cmd->t_tasks_fua = (cdb[1] & 0x8);
2889 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2892 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2894 goto out_unsupported_cdb;
2895 size = transport_get_size(sectors, cdb, cmd);
2896 cmd->t_task_lba = transport_lba_32(cdb);
2897 cmd->t_tasks_fua = (cdb[1] & 0x8);
2898 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2901 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2903 goto out_unsupported_cdb;
2904 size = transport_get_size(sectors, cdb, cmd);
2905 cmd->t_task_lba = transport_lba_64(cdb);
2906 cmd->t_tasks_fua = (cdb[1] & 0x8);
2907 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2909 case XDWRITEREAD_10:
2910 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2911 !(cmd->t_tasks_bidi))
2912 goto out_invalid_cdb_field;
2913 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2915 goto out_unsupported_cdb;
2916 size = transport_get_size(sectors, cdb, cmd);
2917 cmd->t_task_lba = transport_lba_32(cdb);
2918 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2919 passthrough = (dev->transport->transport_type ==
2920 TRANSPORT_PLUGIN_PHBA_PDEV);
2922 * Skip the remaining assignments for TCM/PSCSI passthrough
2927 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2929 cmd->transport_complete_callback = &transport_xor_callback;
2930 cmd->t_tasks_fua = (cdb[1] & 0x8);
2932 case VARIABLE_LENGTH_CMD:
2933 service_action = get_unaligned_be16(&cdb[8]);
2935 * Determine if this is TCM/PSCSI device and we should disable
2936 * internal emulation for this CDB.
2938 passthrough = (dev->transport->transport_type ==
2939 TRANSPORT_PLUGIN_PHBA_PDEV);
2941 switch (service_action) {
2942 case XDWRITEREAD_32:
2943 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2945 goto out_unsupported_cdb;
2946 size = transport_get_size(sectors, cdb, cmd);
2948 * Use WRITE_32 and READ_32 opcodes for the emulated
2949 * XDWRITE_READ_32 logic.
2951 cmd->t_task_lba = transport_lba_64_ext(cdb);
2952 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2955 * Skip the remaining assignments for TCM/PSCSI passthrough
2961 * Setup BIDI XOR callback to be run during
2962 * transport_generic_complete_ok()
2964 cmd->transport_complete_callback = &transport_xor_callback;
2965 cmd->t_tasks_fua = (cdb[10] & 0x8);
2968 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2970 goto out_unsupported_cdb;
2973 size = transport_get_size(1, cdb, cmd);
2975 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2977 goto out_invalid_cdb_field;
2980 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2981 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2983 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2984 goto out_invalid_cdb_field;
2988 pr_err("VARIABLE_LENGTH_CMD service action"
2989 " 0x%04x not supported\n", service_action);
2990 goto out_unsupported_cdb;
2993 case MAINTENANCE_IN:
2994 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2995 /* MAINTENANCE_IN from SCC-2 */
2997 * Check for emulated MI_REPORT_TARGET_PGS.
2999 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3000 cmd->transport_emulate_cdb =
3001 (su_dev->t10_alua.alua_type ==
3002 SPC3_ALUA_EMULATED) ?
3003 core_emulate_report_target_port_groups :
3006 size = (cdb[6] << 24) | (cdb[7] << 16) |
3007 (cdb[8] << 8) | cdb[9];
3009 /* GPCMD_SEND_KEY from multi media commands */
3010 size = (cdb[8] << 8) + cdb[9];
3012 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3016 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3018 case MODE_SELECT_10:
3019 size = (cdb[7] << 8) + cdb[8];
3020 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3024 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3027 case GPCMD_READ_BUFFER_CAPACITY:
3028 case GPCMD_SEND_OPC:
3031 size = (cdb[7] << 8) + cdb[8];
3032 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3034 case READ_BLOCK_LIMITS:
3035 size = READ_BLOCK_LEN;
3036 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3038 case GPCMD_GET_CONFIGURATION:
3039 case GPCMD_READ_FORMAT_CAPACITIES:
3040 case GPCMD_READ_DISC_INFO:
3041 case GPCMD_READ_TRACK_RZONE_INFO:
3042 size = (cdb[7] << 8) + cdb[8];
3043 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3045 case PERSISTENT_RESERVE_IN:
3046 case PERSISTENT_RESERVE_OUT:
3047 cmd->transport_emulate_cdb =
3048 (su_dev->t10_pr.res_type ==
3049 SPC3_PERSISTENT_RESERVATIONS) ?
3050 core_scsi3_emulate_pr : NULL;
3051 size = (cdb[7] << 8) + cdb[8];
3052 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3054 case GPCMD_MECHANISM_STATUS:
3055 case GPCMD_READ_DVD_STRUCTURE:
3056 size = (cdb[8] << 8) + cdb[9];
3057 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3060 size = READ_POSITION_LEN;
3061 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3063 case MAINTENANCE_OUT:
3064 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3065 /* MAINTENANCE_OUT from SCC-2
3067 * Check for emulated MO_SET_TARGET_PGS.
3069 if (cdb[1] == MO_SET_TARGET_PGS) {
3070 cmd->transport_emulate_cdb =
3071 (su_dev->t10_alua.alua_type ==
3072 SPC3_ALUA_EMULATED) ?
3073 core_emulate_set_target_port_groups :
3077 size = (cdb[6] << 24) | (cdb[7] << 16) |
3078 (cdb[8] << 8) | cdb[9];
3080 /* GPCMD_REPORT_KEY from multi media commands */
3081 size = (cdb[8] << 8) + cdb[9];
3083 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3086 size = (cdb[3] << 8) + cdb[4];
3088 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3089 * See spc4r17 section 5.3
3091 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3092 cmd->sam_task_attr = MSG_HEAD_TAG;
3093 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3096 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3097 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3100 size = READ_CAP_LEN;
3101 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3103 case READ_MEDIA_SERIAL_NUMBER:
3104 case SECURITY_PROTOCOL_IN:
3105 case SECURITY_PROTOCOL_OUT:
3106 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3107 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3109 case SERVICE_ACTION_IN:
3110 case ACCESS_CONTROL_IN:
3111 case ACCESS_CONTROL_OUT:
3113 case READ_ATTRIBUTE:
3114 case RECEIVE_COPY_RESULTS:
3115 case WRITE_ATTRIBUTE:
3116 size = (cdb[10] << 24) | (cdb[11] << 16) |
3117 (cdb[12] << 8) | cdb[13];
3118 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3120 case RECEIVE_DIAGNOSTIC:
3121 case SEND_DIAGNOSTIC:
3122 size = (cdb[3] << 8) | cdb[4];
3123 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3125 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3128 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3129 size = (2336 * sectors);
3130 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3135 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3139 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3141 case READ_ELEMENT_STATUS:
3142 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3143 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3146 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3147 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3152 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3153 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3155 if (cdb[0] == RESERVE_10)
3156 size = (cdb[7] << 8) | cdb[8];
3158 size = cmd->data_length;
3161 * Setup the legacy emulated handler for SPC-2 and
3162 * >= SPC-3 compatible reservation handling (CRH=1)
3163 * Otherwise, we assume the underlying SCSI logic is
3164 * is running in SPC_PASSTHROUGH, and wants reservations
3165 * emulation disabled.
3167 cmd->transport_emulate_cdb =
3168 (su_dev->t10_pr.res_type !=
3170 core_scsi2_emulate_crh : NULL;
3171 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3176 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3177 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3179 if (cdb[0] == RELEASE_10)
3180 size = (cdb[7] << 8) | cdb[8];
3182 size = cmd->data_length;
3184 cmd->transport_emulate_cdb =
3185 (su_dev->t10_pr.res_type !=
3187 core_scsi2_emulate_crh : NULL;
3188 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3190 case SYNCHRONIZE_CACHE:
3191 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3193 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3195 if (cdb[0] == SYNCHRONIZE_CACHE) {
3196 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3197 cmd->t_task_lba = transport_lba_32(cdb);
3199 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3200 cmd->t_task_lba = transport_lba_64(cdb);
3203 goto out_unsupported_cdb;
3205 size = transport_get_size(sectors, cdb, cmd);
3206 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3209 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3211 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3214 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3215 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3217 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3219 * Check to ensure that LBA + Range does not exceed past end of
3220 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3222 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3223 if (transport_cmd_get_valid_sectors(cmd) < 0)
3224 goto out_invalid_cdb_field;
3228 size = get_unaligned_be16(&cdb[7]);
3229 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3232 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3234 goto out_unsupported_cdb;
3237 size = transport_get_size(1, cdb, cmd);
3239 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3240 goto out_invalid_cdb_field;
3243 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3244 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3246 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3247 goto out_invalid_cdb_field;
3250 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3252 goto out_unsupported_cdb;
3255 size = transport_get_size(1, cdb, cmd);
3257 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3258 goto out_invalid_cdb_field;
3261 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3262 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3264 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3265 * of byte 1 bit 3 UNMAP instead of original reserved field
3267 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3268 goto out_invalid_cdb_field;
3270 case ALLOW_MEDIUM_REMOVAL:
3271 case GPCMD_CLOSE_TRACK:
3273 case INITIALIZE_ELEMENT_STATUS:
3274 case GPCMD_LOAD_UNLOAD:
3277 case GPCMD_SET_SPEED:
3280 case TEST_UNIT_READY:
3282 case WRITE_FILEMARKS:
3284 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3287 cmd->transport_emulate_cdb =
3288 transport_core_report_lun_response;
3289 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3291 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3292 * See spc4r17 section 5.3
3294 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3295 cmd->sam_task_attr = MSG_HEAD_TAG;
3296 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3299 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3300 " 0x%02x, sending CHECK_CONDITION.\n",
3301 cmd->se_tfo->get_fabric_name(), cdb[0]);
3302 goto out_unsupported_cdb;
3305 if (size != cmd->data_length) {
3306 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3307 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3308 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3309 cmd->data_length, size, cdb[0]);
3311 cmd->cmd_spdtl = size;
3313 if (cmd->data_direction == DMA_TO_DEVICE) {
3314 pr_err("Rejecting underflow/overflow"
3316 goto out_invalid_cdb_field;
3319 * Reject READ_* or WRITE_* with overflow/underflow for
3320 * type SCF_SCSI_DATA_SG_IO_CDB.
3322 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3323 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3324 " CDB on non 512-byte sector setup subsystem"
3325 " plugin: %s\n", dev->transport->name);
3326 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3327 goto out_invalid_cdb_field;
3330 if (size > cmd->data_length) {
3331 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3332 cmd->residual_count = (size - cmd->data_length);
3334 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3335 cmd->residual_count = (cmd->data_length - size);
3337 cmd->data_length = size;
3340 /* Let's limit control cdbs to a page, for simplicity's sake. */
3341 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3343 goto out_invalid_cdb_field;
3345 transport_set_supported_SAM_opcode(cmd);
3348 out_unsupported_cdb:
3349 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3350 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3352 out_invalid_cdb_field:
3353 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3354 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3359 * Called from transport_generic_complete_ok() and
3360 * transport_generic_request_failure() to determine which dormant/delayed
3361 * and ordered cmds need to have their tasks added to the execution queue.
3363 static void transport_complete_task_attr(struct se_cmd *cmd)
3365 struct se_device *dev = cmd->se_dev;
3366 struct se_cmd *cmd_p, *cmd_tmp;
3367 int new_active_tasks = 0;
3369 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3370 atomic_dec(&dev->simple_cmds);
3371 smp_mb__after_atomic_dec();
3372 dev->dev_cur_ordered_id++;
3373 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3374 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3375 cmd->se_ordered_id);
3376 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3377 atomic_dec(&dev->dev_hoq_count);
3378 smp_mb__after_atomic_dec();
3379 dev->dev_cur_ordered_id++;
3380 pr_debug("Incremented dev_cur_ordered_id: %u for"
3381 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3382 cmd->se_ordered_id);
3383 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3384 spin_lock(&dev->ordered_cmd_lock);
3385 list_del(&cmd->se_ordered_node);
3386 atomic_dec(&dev->dev_ordered_sync);
3387 smp_mb__after_atomic_dec();
3388 spin_unlock(&dev->ordered_cmd_lock);
3390 dev->dev_cur_ordered_id++;
3391 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3392 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3395 * Process all commands up to the last received
3396 * ORDERED task attribute which requires another blocking
3399 spin_lock(&dev->delayed_cmd_lock);
3400 list_for_each_entry_safe(cmd_p, cmd_tmp,
3401 &dev->delayed_cmd_list, se_delayed_node) {
3403 list_del(&cmd_p->se_delayed_node);
3404 spin_unlock(&dev->delayed_cmd_lock);
3406 pr_debug("Calling add_tasks() for"
3407 " cmd_p: 0x%02x Task Attr: 0x%02x"
3408 " Dormant -> Active, se_ordered_id: %u\n",
3409 cmd_p->t_task_cdb[0],
3410 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3412 transport_add_tasks_from_cmd(cmd_p);
3415 spin_lock(&dev->delayed_cmd_lock);
3416 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3419 spin_unlock(&dev->delayed_cmd_lock);
3421 * If new tasks have become active, wake up the transport thread
3422 * to do the processing of the Active tasks.
3424 if (new_active_tasks != 0)
3425 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3428 static void transport_complete_qf(struct se_cmd *cmd)
3432 transport_stop_all_task_timers(cmd);
3433 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3434 transport_complete_task_attr(cmd);
3436 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3437 ret = cmd->se_tfo->queue_status(cmd);
3442 switch (cmd->data_direction) {
3443 case DMA_FROM_DEVICE:
3444 ret = cmd->se_tfo->queue_data_in(cmd);
3447 if (cmd->t_bidi_data_sg) {
3448 ret = cmd->se_tfo->queue_data_in(cmd);
3452 /* Fall through for DMA_TO_DEVICE */
3454 ret = cmd->se_tfo->queue_status(cmd);
3462 transport_handle_queue_full(cmd, cmd->se_dev);
3465 transport_lun_remove_cmd(cmd);
3466 transport_cmd_check_stop_to_fabric(cmd);
3469 static void transport_handle_queue_full(
3471 struct se_device *dev)
3473 spin_lock_irq(&dev->qf_cmd_lock);
3474 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3475 atomic_inc(&dev->dev_qf_count);
3476 smp_mb__after_atomic_inc();
3477 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3479 schedule_work(&cmd->se_dev->qf_work_queue);
3482 static void transport_generic_complete_ok(struct se_cmd *cmd)
3484 int reason = 0, ret;
3486 * Check if we need to move delayed/dormant tasks from cmds on the
3487 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3490 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3491 transport_complete_task_attr(cmd);
3493 * Check to schedule QUEUE_FULL work, or execute an existing
3494 * cmd->transport_qf_callback()
3496 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3497 schedule_work(&cmd->se_dev->qf_work_queue);
3500 * Check if we need to retrieve a sense buffer from
3501 * the struct se_cmd in question.
3503 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3504 if (transport_get_sense_data(cmd) < 0)
3505 reason = TCM_NON_EXISTENT_LUN;
3508 * Only set when an struct se_task->task_scsi_status returned
3509 * a non GOOD status.
3511 if (cmd->scsi_status) {
3512 ret = transport_send_check_condition_and_sense(
3517 transport_lun_remove_cmd(cmd);
3518 transport_cmd_check_stop_to_fabric(cmd);
3523 * Check for a callback, used by amongst other things
3524 * XDWRITE_READ_10 emulation.
3526 if (cmd->transport_complete_callback)
3527 cmd->transport_complete_callback(cmd);
3529 switch (cmd->data_direction) {
3530 case DMA_FROM_DEVICE:
3531 spin_lock(&cmd->se_lun->lun_sep_lock);
3532 if (cmd->se_lun->lun_sep) {
3533 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3536 spin_unlock(&cmd->se_lun->lun_sep_lock);
3538 ret = cmd->se_tfo->queue_data_in(cmd);
3543 spin_lock(&cmd->se_lun->lun_sep_lock);
3544 if (cmd->se_lun->lun_sep) {
3545 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3548 spin_unlock(&cmd->se_lun->lun_sep_lock);
3550 * Check if we need to send READ payload for BIDI-COMMAND
3552 if (cmd->t_bidi_data_sg) {
3553 spin_lock(&cmd->se_lun->lun_sep_lock);
3554 if (cmd->se_lun->lun_sep) {
3555 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3558 spin_unlock(&cmd->se_lun->lun_sep_lock);
3559 ret = cmd->se_tfo->queue_data_in(cmd);
3564 /* Fall through for DMA_TO_DEVICE */
3566 ret = cmd->se_tfo->queue_status(cmd);
3574 transport_lun_remove_cmd(cmd);
3575 transport_cmd_check_stop_to_fabric(cmd);
3579 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3580 " data_direction: %d\n", cmd, cmd->data_direction);
3581 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3582 transport_handle_queue_full(cmd, cmd->se_dev);
3585 static void transport_free_dev_tasks(struct se_cmd *cmd)
3587 struct se_task *task, *task_tmp;
3588 unsigned long flags;
3590 spin_lock_irqsave(&cmd->t_state_lock, flags);
3591 list_for_each_entry_safe(task, task_tmp,
3592 &cmd->t_task_list, t_list) {
3593 if (task->task_flags & TF_ACTIVE)
3596 kfree(task->task_sg_bidi);
3597 kfree(task->task_sg);
3599 list_del(&task->t_list);
3601 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3602 cmd->se_dev->transport->free_task(task);
3603 spin_lock_irqsave(&cmd->t_state_lock, flags);
3605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3608 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3610 struct scatterlist *sg;
3613 for_each_sg(sgl, sg, nents, count)
3614 __free_page(sg_page(sg));
3619 static inline void transport_free_pages(struct se_cmd *cmd)
3621 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3624 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3625 cmd->t_data_sg = NULL;
3626 cmd->t_data_nents = 0;
3628 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3629 cmd->t_bidi_data_sg = NULL;
3630 cmd->t_bidi_data_nents = 0;
3634 * transport_put_cmd - release a reference to a command
3635 * @cmd: command to release
3637 * This routine releases our reference to the command and frees it if possible.
3639 static void transport_put_cmd(struct se_cmd *cmd)
3641 unsigned long flags;
3644 spin_lock_irqsave(&cmd->t_state_lock, flags);
3645 if (atomic_read(&cmd->t_fe_count)) {
3646 if (!atomic_dec_and_test(&cmd->t_fe_count))
3650 if (atomic_read(&cmd->t_se_count)) {
3651 if (!atomic_dec_and_test(&cmd->t_se_count))
3655 if (atomic_read(&cmd->transport_dev_active)) {
3656 atomic_set(&cmd->transport_dev_active, 0);
3657 transport_all_task_dev_remove_state(cmd);
3660 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3662 if (free_tasks != 0)
3663 transport_free_dev_tasks(cmd);
3665 transport_free_pages(cmd);
3666 transport_release_cmd(cmd);
3669 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3673 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3674 * allocating in the core.
3675 * @cmd: Associated se_cmd descriptor
3676 * @mem: SGL style memory for TCM WRITE / READ
3677 * @sg_mem_num: Number of SGL elements
3678 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3679 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3681 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3684 int transport_generic_map_mem_to_cmd(
3686 struct scatterlist *sgl,
3688 struct scatterlist *sgl_bidi,
3691 if (!sgl || !sgl_count)
3694 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3695 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3697 cmd->t_data_sg = sgl;
3698 cmd->t_data_nents = sgl_count;
3700 if (sgl_bidi && sgl_bidi_count) {
3701 cmd->t_bidi_data_sg = sgl_bidi;
3702 cmd->t_bidi_data_nents = sgl_bidi_count;
3704 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3709 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3711 static int transport_new_cmd_obj(struct se_cmd *cmd)
3713 struct se_device *dev = cmd->se_dev;
3714 int set_counts = 1, rc, task_cdbs;
3717 * Setup any BIDI READ tasks and memory from
3718 * cmd->t_mem_bidi_list so the READ struct se_tasks
3719 * are queued first for the non pSCSI passthrough case.
3721 if (cmd->t_bidi_data_sg &&
3722 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3723 rc = transport_allocate_tasks(cmd,
3726 cmd->t_bidi_data_sg,
3727 cmd->t_bidi_data_nents);
3729 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3730 cmd->scsi_sense_reason =
3731 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3734 atomic_inc(&cmd->t_fe_count);
3735 atomic_inc(&cmd->t_se_count);
3739 * Setup the tasks and memory from cmd->t_mem_list
3740 * Note for BIDI transfers this will contain the WRITE payload
3742 task_cdbs = transport_allocate_tasks(cmd,
3744 cmd->data_direction,
3747 if (task_cdbs <= 0) {
3748 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3749 cmd->scsi_sense_reason =
3750 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3755 atomic_inc(&cmd->t_fe_count);
3756 atomic_inc(&cmd->t_se_count);
3759 cmd->t_task_list_num = task_cdbs;
3761 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3762 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3763 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
3767 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3769 struct scatterlist *sg = cmd->t_data_sg;
3773 * We need to take into account a possible offset here for fabrics like
3774 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3775 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3777 return kmap(sg_page(sg)) + sg->offset;
3779 EXPORT_SYMBOL(transport_kmap_first_data_page);
3781 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3783 kunmap(sg_page(cmd->t_data_sg));
3785 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3788 transport_generic_get_mem(struct se_cmd *cmd)
3790 u32 length = cmd->data_length;
3795 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3796 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3797 if (!cmd->t_data_sg)
3800 cmd->t_data_nents = nents;
3801 sg_init_table(cmd->t_data_sg, nents);
3804 u32 page_len = min_t(u32, length, PAGE_SIZE);
3805 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3809 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3817 __free_page(sg_page(&cmd->t_data_sg[i]));
3820 kfree(cmd->t_data_sg);
3821 cmd->t_data_sg = NULL;
3825 /* Reduce sectors if they are too long for the device */
3826 static inline sector_t transport_limit_task_sectors(
3827 struct se_device *dev,
3828 unsigned long long lba,
3831 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3833 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3834 if ((lba + sectors) > transport_dev_end_lba(dev))
3835 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3842 * This function can be used by HW target mode drivers to create a linked
3843 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3844 * This is intended to be called during the completion path by TCM Core
3845 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3847 void transport_do_task_sg_chain(struct se_cmd *cmd)
3849 struct scatterlist *sg_first = NULL;
3850 struct scatterlist *sg_prev = NULL;
3851 int sg_prev_nents = 0;
3852 struct scatterlist *sg;
3853 struct se_task *task;
3854 u32 chained_nents = 0;
3857 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3860 * Walk the struct se_task list and setup scatterlist chains
3861 * for each contiguously allocated struct se_task->task_sg[].
3863 list_for_each_entry(task, &cmd->t_task_list, t_list) {
3868 sg_first = task->task_sg;
3869 chained_nents = task->task_sg_nents;
3871 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3872 chained_nents += task->task_sg_nents;
3875 * For the padded tasks, use the extra SGL vector allocated
3876 * in transport_allocate_data_tasks() for the sg_prev_nents
3877 * offset into sg_chain() above.
3879 * We do not need the padding for the last task (or a single
3880 * task), but in that case we will never use the sg_prev_nents
3881 * value below which would be incorrect.
3883 sg_prev_nents = (task->task_sg_nents + 1);
3884 sg_prev = task->task_sg;
3887 * Setup the starting pointer and total t_tasks_sg_linked_no including
3888 * padding SGs for linking and to mark the end.
3890 cmd->t_tasks_sg_chained = sg_first;
3891 cmd->t_tasks_sg_chained_no = chained_nents;
3893 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3894 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3895 cmd->t_tasks_sg_chained_no);
3897 for_each_sg(cmd->t_tasks_sg_chained, sg,
3898 cmd->t_tasks_sg_chained_no, i) {
3900 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3901 i, sg, sg_page(sg), sg->length, sg->offset);
3902 if (sg_is_chain(sg))
3903 pr_debug("SG: %p sg_is_chain=1\n", sg);
3905 pr_debug("SG: %p sg_is_last=1\n", sg);
3908 EXPORT_SYMBOL(transport_do_task_sg_chain);
3911 * Break up cmd into chunks transport can handle
3913 static int transport_allocate_data_tasks(
3915 unsigned long long lba,
3916 enum dma_data_direction data_direction,
3917 struct scatterlist *sgl,
3918 unsigned int sgl_nents)
3920 struct se_task *task;
3921 struct se_device *dev = cmd->se_dev;
3922 unsigned long flags;
3924 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3925 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3926 struct scatterlist *sg;
3927 struct scatterlist *cmd_sg;
3929 WARN_ON(cmd->data_length % sector_size);
3930 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3931 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3934 for (i = 0; i < task_count; i++) {
3935 unsigned int task_size, task_sg_nents_padded;
3938 task = transport_generic_get_task(cmd, data_direction);
3942 task->task_lba = lba;
3943 task->task_sectors = min(sectors, dev_max_sectors);
3944 task->task_size = task->task_sectors * sector_size;
3947 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3948 * in order to calculate the number per task SGL entries
3950 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3952 * Check if the fabric module driver is requesting that all
3953 * struct se_task->task_sg[] be chained together.. If so,
3954 * then allocate an extra padding SG entry for linking and
3955 * marking the end of the chained SGL for every task except
3956 * the last one for (task_count > 1) operation, or skipping
3957 * the extra padding for the (task_count == 1) case.
3959 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3960 task_sg_nents_padded = (task->task_sg_nents + 1);
3962 task_sg_nents_padded = task->task_sg_nents;
3964 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3965 task_sg_nents_padded, GFP_KERNEL);
3966 if (!task->task_sg) {
3967 cmd->se_dev->transport->free_task(task);
3971 sg_init_table(task->task_sg, task_sg_nents_padded);
3973 task_size = task->task_size;
3975 /* Build new sgl, only up to task_size */
3976 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3977 if (cmd_sg->length > task_size)
3981 task_size -= cmd_sg->length;
3982 cmd_sg = sg_next(cmd_sg);
3985 lba += task->task_sectors;
3986 sectors -= task->task_sectors;
3988 spin_lock_irqsave(&cmd->t_state_lock, flags);
3989 list_add_tail(&task->t_list, &cmd->t_task_list);
3990 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3997 transport_allocate_control_task(struct se_cmd *cmd)
3999 struct se_task *task;
4000 unsigned long flags;
4002 task = transport_generic_get_task(cmd, cmd->data_direction);
4006 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4008 if (!task->task_sg) {
4009 cmd->se_dev->transport->free_task(task);
4013 memcpy(task->task_sg, cmd->t_data_sg,
4014 sizeof(struct scatterlist) * cmd->t_data_nents);
4015 task->task_size = cmd->data_length;
4016 task->task_sg_nents = cmd->t_data_nents;
4018 spin_lock_irqsave(&cmd->t_state_lock, flags);
4019 list_add_tail(&task->t_list, &cmd->t_task_list);
4020 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4022 /* Success! Return number of tasks allocated */
4026 static u32 transport_allocate_tasks(
4028 unsigned long long lba,
4029 enum dma_data_direction data_direction,
4030 struct scatterlist *sgl,
4031 unsigned int sgl_nents)
4033 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4034 if (transport_cmd_get_valid_sectors(cmd) < 0)
4037 return transport_allocate_data_tasks(cmd, lba, data_direction,
4040 return transport_allocate_control_task(cmd);
4045 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4047 * Allocate storage transport resources from a set of values predefined
4048 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4049 * Any non zero return here is treated as an "out of resource' op here.
4052 * Generate struct se_task(s) and/or their payloads for this CDB.
4054 int transport_generic_new_cmd(struct se_cmd *cmd)
4059 * Determine is the TCM fabric module has already allocated physical
4060 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4063 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4065 ret = transport_generic_get_mem(cmd);
4070 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4071 * control or data CDB types, and perform the map to backend subsystem
4072 * code from SGL memory allocated here by transport_generic_get_mem(), or
4073 * via pre-existing SGL memory setup explictly by fabric module code with
4074 * transport_generic_map_mem_to_cmd().
4076 ret = transport_new_cmd_obj(cmd);
4080 * For WRITEs, let the fabric know its buffer is ready..
4081 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4082 * will be added to the struct se_device execution queue after its WRITE
4083 * data has arrived. (ie: It gets handled by the transport processing
4084 * thread a second time)
4086 if (cmd->data_direction == DMA_TO_DEVICE) {
4087 transport_add_tasks_to_state_queue(cmd);
4088 return transport_generic_write_pending(cmd);
4091 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4092 * to the execution queue.
4094 transport_execute_tasks(cmd);
4097 EXPORT_SYMBOL(transport_generic_new_cmd);
4099 /* transport_generic_process_write():
4103 void transport_generic_process_write(struct se_cmd *cmd)
4105 transport_execute_tasks(cmd);
4107 EXPORT_SYMBOL(transport_generic_process_write);
4109 static void transport_write_pending_qf(struct se_cmd *cmd)
4111 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4112 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4114 transport_handle_queue_full(cmd, cmd->se_dev);
4118 static int transport_generic_write_pending(struct se_cmd *cmd)
4120 unsigned long flags;
4123 spin_lock_irqsave(&cmd->t_state_lock, flags);
4124 cmd->t_state = TRANSPORT_WRITE_PENDING;
4125 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4128 * Clear the se_cmd for WRITE_PENDING status in order to set
4129 * cmd->t_transport_active=0 so that transport_generic_handle_data
4130 * can be called from HW target mode interrupt code. This is safe
4131 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4132 * because the se_cmd->se_lun pointer is not being cleared.
4134 transport_cmd_check_stop(cmd, 1, 0);
4137 * Call the fabric write_pending function here to let the
4138 * frontend know that WRITE buffers are ready.
4140 ret = cmd->se_tfo->write_pending(cmd);
4146 return PYX_TRANSPORT_WRITE_PENDING;
4149 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
4150 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4151 transport_handle_queue_full(cmd, cmd->se_dev);
4156 * transport_release_cmd - free a command
4157 * @cmd: command to free
4159 * This routine unconditionally frees a command, and reference counting
4160 * or list removal must be done in the caller.
4162 void transport_release_cmd(struct se_cmd *cmd)
4164 BUG_ON(!cmd->se_tfo);
4166 if (cmd->se_tmr_req)
4167 core_tmr_release_req(cmd->se_tmr_req);
4168 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4169 kfree(cmd->t_task_cdb);
4170 cmd->se_tfo->release_cmd(cmd);
4172 EXPORT_SYMBOL(transport_release_cmd);
4174 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
4176 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4177 if (wait_for_tasks && cmd->se_tmr_req)
4178 transport_wait_for_tasks(cmd);
4180 transport_release_cmd(cmd);
4183 transport_wait_for_tasks(cmd);
4185 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4188 transport_lun_remove_cmd(cmd);
4190 transport_free_dev_tasks(cmd);
4192 transport_put_cmd(cmd);
4195 EXPORT_SYMBOL(transport_generic_free_cmd);
4197 /* transport_lun_wait_for_tasks():
4199 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4200 * an struct se_lun to be successfully shutdown.
4202 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4204 unsigned long flags;
4207 * If the frontend has already requested this struct se_cmd to
4208 * be stopped, we can safely ignore this struct se_cmd.
4210 spin_lock_irqsave(&cmd->t_state_lock, flags);
4211 if (atomic_read(&cmd->t_transport_stop)) {
4212 atomic_set(&cmd->transport_lun_stop, 0);
4213 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4214 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4215 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4216 transport_cmd_check_stop(cmd, 1, 0);
4219 atomic_set(&cmd->transport_lun_fe_stop, 1);
4220 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4222 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4224 ret = transport_stop_tasks_for_cmd(cmd);
4226 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4227 " %d\n", cmd, cmd->t_task_list_num, ret);
4229 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4230 cmd->se_tfo->get_task_tag(cmd));
4231 wait_for_completion(&cmd->transport_lun_stop_comp);
4232 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4233 cmd->se_tfo->get_task_tag(cmd));
4235 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
4240 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4242 struct se_cmd *cmd = NULL;
4243 unsigned long lun_flags, cmd_flags;
4245 * Do exception processing and return CHECK_CONDITION status to the
4248 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4249 while (!list_empty(&lun->lun_cmd_list)) {
4250 cmd = list_first_entry(&lun->lun_cmd_list,
4251 struct se_cmd, se_lun_node);
4252 list_del(&cmd->se_lun_node);
4254 atomic_set(&cmd->transport_lun_active, 0);
4256 * This will notify iscsi_target_transport.c:
4257 * transport_cmd_check_stop() that a LUN shutdown is in
4258 * progress for the iscsi_cmd_t.
4260 spin_lock(&cmd->t_state_lock);
4261 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4262 "_lun_stop for ITT: 0x%08x\n",
4263 cmd->se_lun->unpacked_lun,
4264 cmd->se_tfo->get_task_tag(cmd));
4265 atomic_set(&cmd->transport_lun_stop, 1);
4266 spin_unlock(&cmd->t_state_lock);
4268 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4271 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4272 cmd->se_tfo->get_task_tag(cmd),
4273 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4277 * If the Storage engine still owns the iscsi_cmd_t, determine
4278 * and/or stop its context.
4280 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4281 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4282 cmd->se_tfo->get_task_tag(cmd));
4284 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4285 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4289 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4290 "_wait_for_tasks(): SUCCESS\n",
4291 cmd->se_lun->unpacked_lun,
4292 cmd->se_tfo->get_task_tag(cmd));
4294 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4295 if (!atomic_read(&cmd->transport_dev_active)) {
4296 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4299 atomic_set(&cmd->transport_dev_active, 0);
4300 transport_all_task_dev_remove_state(cmd);
4301 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4303 transport_free_dev_tasks(cmd);
4305 * The Storage engine stopped this struct se_cmd before it was
4306 * send to the fabric frontend for delivery back to the
4307 * Initiator Node. Return this SCSI CDB back with an
4308 * CHECK_CONDITION status.
4311 transport_send_check_condition_and_sense(cmd,
4312 TCM_NON_EXISTENT_LUN, 0);
4314 * If the fabric frontend is waiting for this iscsi_cmd_t to
4315 * be released, notify the waiting thread now that LU has
4316 * finished accessing it.
4318 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4319 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4320 pr_debug("SE_LUN[%d] - Detected FE stop for"
4321 " struct se_cmd: %p ITT: 0x%08x\n",
4323 cmd, cmd->se_tfo->get_task_tag(cmd));
4325 spin_unlock_irqrestore(&cmd->t_state_lock,
4327 transport_cmd_check_stop(cmd, 1, 0);
4328 complete(&cmd->transport_lun_fe_stop_comp);
4329 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4332 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4333 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4335 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4336 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4338 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4341 static int transport_clear_lun_thread(void *p)
4343 struct se_lun *lun = (struct se_lun *)p;
4345 __transport_clear_lun_from_sessions(lun);
4346 complete(&lun->lun_shutdown_comp);
4351 int transport_clear_lun_from_sessions(struct se_lun *lun)
4353 struct task_struct *kt;
4355 kt = kthread_run(transport_clear_lun_thread, lun,
4356 "tcm_cl_%u", lun->unpacked_lun);
4358 pr_err("Unable to start clear_lun thread\n");
4361 wait_for_completion(&lun->lun_shutdown_comp);
4367 * transport_wait_for_tasks - wait for completion to occur
4368 * @cmd: command to wait
4370 * Called from frontend fabric context to wait for storage engine
4371 * to pause and/or release frontend generated struct se_cmd.
4373 void transport_wait_for_tasks(struct se_cmd *cmd)
4375 unsigned long flags;
4377 spin_lock_irqsave(&cmd->t_state_lock, flags);
4378 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4379 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4383 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4384 * has been set in transport_set_supported_SAM_opcode().
4386 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4387 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4391 * If we are already stopped due to an external event (ie: LUN shutdown)
4392 * sleep until the connection can have the passed struct se_cmd back.
4393 * The cmd->transport_lun_stopped_sem will be upped by
4394 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4395 * has completed its operation on the struct se_cmd.
4397 if (atomic_read(&cmd->transport_lun_stop)) {
4399 pr_debug("wait_for_tasks: Stopping"
4400 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4401 "_stop_comp); for ITT: 0x%08x\n",
4402 cmd->se_tfo->get_task_tag(cmd));
4404 * There is a special case for WRITES where a FE exception +
4405 * LUN shutdown means ConfigFS context is still sleeping on
4406 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4407 * We go ahead and up transport_lun_stop_comp just to be sure
4410 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4411 complete(&cmd->transport_lun_stop_comp);
4412 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4413 spin_lock_irqsave(&cmd->t_state_lock, flags);
4415 transport_all_task_dev_remove_state(cmd);
4417 * At this point, the frontend who was the originator of this
4418 * struct se_cmd, now owns the structure and can be released through
4419 * normal means below.
4421 pr_debug("wait_for_tasks: Stopped"
4422 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4423 "stop_comp); for ITT: 0x%08x\n",
4424 cmd->se_tfo->get_task_tag(cmd));
4426 atomic_set(&cmd->transport_lun_stop, 0);
4428 if (!atomic_read(&cmd->t_transport_active) ||
4429 atomic_read(&cmd->t_transport_aborted)) {
4430 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4434 atomic_set(&cmd->t_transport_stop, 1);
4436 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4437 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4438 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4439 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
4440 cmd->deferred_t_state);
4442 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4444 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4446 wait_for_completion(&cmd->t_transport_stop_comp);
4448 spin_lock_irqsave(&cmd->t_state_lock, flags);
4449 atomic_set(&cmd->t_transport_active, 0);
4450 atomic_set(&cmd->t_transport_stop, 0);
4452 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4453 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4454 cmd->se_tfo->get_task_tag(cmd));
4456 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4458 EXPORT_SYMBOL(transport_wait_for_tasks);
4460 static int transport_get_sense_codes(
4465 *asc = cmd->scsi_asc;
4466 *ascq = cmd->scsi_ascq;
4471 static int transport_set_sense_codes(
4476 cmd->scsi_asc = asc;
4477 cmd->scsi_ascq = ascq;
4482 int transport_send_check_condition_and_sense(
4487 unsigned char *buffer = cmd->sense_buffer;
4488 unsigned long flags;
4490 u8 asc = 0, ascq = 0;
4492 spin_lock_irqsave(&cmd->t_state_lock, flags);
4493 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4494 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4497 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4498 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4500 if (!reason && from_transport)
4503 if (!from_transport)
4504 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4506 * Data Segment and SenseLength of the fabric response PDU.
4508 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4509 * from include/scsi/scsi_cmnd.h
4511 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4512 TRANSPORT_SENSE_BUFFER);
4514 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4515 * SENSE KEY values from include/scsi/scsi.h
4518 case TCM_NON_EXISTENT_LUN:
4520 buffer[offset] = 0x70;
4521 /* ILLEGAL REQUEST */
4522 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4523 /* LOGICAL UNIT NOT SUPPORTED */
4524 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4526 case TCM_UNSUPPORTED_SCSI_OPCODE:
4527 case TCM_SECTOR_COUNT_TOO_MANY:
4529 buffer[offset] = 0x70;
4530 /* ILLEGAL REQUEST */
4531 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4532 /* INVALID COMMAND OPERATION CODE */
4533 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4535 case TCM_UNKNOWN_MODE_PAGE:
4537 buffer[offset] = 0x70;
4538 /* ILLEGAL REQUEST */
4539 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4540 /* INVALID FIELD IN CDB */
4541 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4543 case TCM_CHECK_CONDITION_ABORT_CMD:
4545 buffer[offset] = 0x70;
4546 /* ABORTED COMMAND */
4547 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4548 /* BUS DEVICE RESET FUNCTION OCCURRED */
4549 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4550 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4552 case TCM_INCORRECT_AMOUNT_OF_DATA:
4554 buffer[offset] = 0x70;
4555 /* ABORTED COMMAND */
4556 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4558 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4559 /* NOT ENOUGH UNSOLICITED DATA */
4560 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4562 case TCM_INVALID_CDB_FIELD:
4564 buffer[offset] = 0x70;
4565 /* ABORTED COMMAND */
4566 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4567 /* INVALID FIELD IN CDB */
4568 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4570 case TCM_INVALID_PARAMETER_LIST:
4572 buffer[offset] = 0x70;
4573 /* ABORTED COMMAND */
4574 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4575 /* INVALID FIELD IN PARAMETER LIST */
4576 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4578 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4580 buffer[offset] = 0x70;
4581 /* ABORTED COMMAND */
4582 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4584 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4585 /* UNEXPECTED_UNSOLICITED_DATA */
4586 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4588 case TCM_SERVICE_CRC_ERROR:
4590 buffer[offset] = 0x70;
4591 /* ABORTED COMMAND */
4592 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4593 /* PROTOCOL SERVICE CRC ERROR */
4594 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4596 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4598 case TCM_SNACK_REJECTED:
4600 buffer[offset] = 0x70;
4601 /* ABORTED COMMAND */
4602 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4604 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4605 /* FAILED RETRANSMISSION REQUEST */
4606 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4608 case TCM_WRITE_PROTECTED:
4610 buffer[offset] = 0x70;
4612 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4613 /* WRITE PROTECTED */
4614 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4616 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4618 buffer[offset] = 0x70;
4619 /* UNIT ATTENTION */
4620 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4621 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4622 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4623 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4625 case TCM_CHECK_CONDITION_NOT_READY:
4627 buffer[offset] = 0x70;
4629 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4630 transport_get_sense_codes(cmd, &asc, &ascq);
4631 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4632 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4634 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4637 buffer[offset] = 0x70;
4638 /* ILLEGAL REQUEST */
4639 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4640 /* LOGICAL UNIT COMMUNICATION FAILURE */
4641 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4645 * This code uses linux/include/scsi/scsi.h SAM status codes!
4647 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4649 * Automatically padded, this value is encoded in the fabric's
4650 * data_length response PDU containing the SCSI defined sense data.
4652 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4655 return cmd->se_tfo->queue_status(cmd);
4657 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4659 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4663 if (atomic_read(&cmd->t_transport_aborted) != 0) {
4665 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4668 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4669 " status for CDB: 0x%02x ITT: 0x%08x\n",
4671 cmd->se_tfo->get_task_tag(cmd));
4673 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4674 cmd->se_tfo->queue_status(cmd);
4679 EXPORT_SYMBOL(transport_check_aborted_status);
4681 void transport_send_task_abort(struct se_cmd *cmd)
4683 unsigned long flags;
4685 spin_lock_irqsave(&cmd->t_state_lock, flags);
4686 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4687 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4690 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4693 * If there are still expected incoming fabric WRITEs, we wait
4694 * until until they have completed before sending a TASK_ABORTED
4695 * response. This response with TASK_ABORTED status will be
4696 * queued back to fabric module by transport_check_aborted_status().
4698 if (cmd->data_direction == DMA_TO_DEVICE) {
4699 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4700 atomic_inc(&cmd->t_transport_aborted);
4701 smp_mb__after_atomic_inc();
4702 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4703 transport_new_cmd_failure(cmd);
4707 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4709 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4710 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4711 cmd->se_tfo->get_task_tag(cmd));
4713 cmd->se_tfo->queue_status(cmd);
4716 /* transport_generic_do_tmr():
4720 int transport_generic_do_tmr(struct se_cmd *cmd)
4722 struct se_device *dev = cmd->se_dev;
4723 struct se_tmr_req *tmr = cmd->se_tmr_req;
4726 switch (tmr->function) {
4727 case TMR_ABORT_TASK:
4728 tmr->response = TMR_FUNCTION_REJECTED;
4730 case TMR_ABORT_TASK_SET:
4732 case TMR_CLEAR_TASK_SET:
4733 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4736 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4737 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4738 TMR_FUNCTION_REJECTED;
4740 case TMR_TARGET_WARM_RESET:
4741 tmr->response = TMR_FUNCTION_REJECTED;
4743 case TMR_TARGET_COLD_RESET:
4744 tmr->response = TMR_FUNCTION_REJECTED;
4747 pr_err("Uknown TMR function: 0x%02x.\n",
4749 tmr->response = TMR_FUNCTION_REJECTED;
4753 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4754 cmd->se_tfo->queue_tm_rsp(cmd);
4756 transport_cmd_check_stop(cmd, 2, 0);
4760 /* transport_processing_thread():
4764 static int transport_processing_thread(void *param)
4768 struct se_device *dev = (struct se_device *) param;
4770 set_user_nice(current, -20);
4772 while (!kthread_should_stop()) {
4773 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4774 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4775 kthread_should_stop());
4780 __transport_execute_tasks(dev);
4782 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4786 switch (cmd->t_state) {
4787 case TRANSPORT_NEW_CMD:
4790 case TRANSPORT_NEW_CMD_MAP:
4791 if (!cmd->se_tfo->new_cmd_map) {
4792 pr_err("cmd->se_tfo->new_cmd_map is"
4793 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4796 ret = cmd->se_tfo->new_cmd_map(cmd);
4798 cmd->transport_error_status = ret;
4799 transport_generic_request_failure(cmd, NULL,
4800 0, (cmd->data_direction !=
4804 ret = transport_generic_new_cmd(cmd);
4808 cmd->transport_error_status = ret;
4809 transport_generic_request_failure(cmd, NULL,
4810 0, (cmd->data_direction !=
4814 case TRANSPORT_PROCESS_WRITE:
4815 transport_generic_process_write(cmd);
4817 case TRANSPORT_COMPLETE_OK:
4818 transport_stop_all_task_timers(cmd);
4819 transport_generic_complete_ok(cmd);
4821 case TRANSPORT_REMOVE:
4822 transport_put_cmd(cmd);
4824 case TRANSPORT_FREE_CMD_INTR:
4825 transport_generic_free_cmd(cmd, 0);
4827 case TRANSPORT_PROCESS_TMR:
4828 transport_generic_do_tmr(cmd);
4830 case TRANSPORT_COMPLETE_FAILURE:
4831 transport_generic_request_failure(cmd, NULL, 1, 1);
4833 case TRANSPORT_COMPLETE_TIMEOUT:
4834 transport_stop_all_task_timers(cmd);
4835 transport_generic_request_timeout(cmd);
4837 case TRANSPORT_COMPLETE_QF_WP:
4838 transport_write_pending_qf(cmd);
4840 case TRANSPORT_COMPLETE_QF_OK:
4841 transport_complete_qf(cmd);
4844 pr_err("Unknown t_state: %d deferred_t_state:"
4845 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
4846 " %u\n", cmd->t_state, cmd->deferred_t_state,
4847 cmd->se_tfo->get_task_tag(cmd),
4848 cmd->se_tfo->get_cmd_state(cmd),
4849 cmd->se_lun->unpacked_lun);
4857 WARN_ON(!list_empty(&dev->state_task_list));
4858 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4859 dev->process_thread = NULL;