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 workqueue_struct *target_completion_wq;
62 static struct kmem_cache *se_cmd_cache;
63 static struct kmem_cache *se_sess_cache;
64 struct kmem_cache *se_tmr_req_cache;
65 struct kmem_cache *se_ua_cache;
66 struct kmem_cache *t10_pr_reg_cache;
67 struct kmem_cache *t10_alua_lu_gp_cache;
68 struct kmem_cache *t10_alua_lu_gp_mem_cache;
69 struct kmem_cache *t10_alua_tg_pt_gp_cache;
70 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
72 static int transport_generic_write_pending(struct se_cmd *);
73 static int transport_processing_thread(void *param);
74 static int __transport_execute_tasks(struct se_device *dev);
75 static void transport_complete_task_attr(struct se_cmd *cmd);
76 static void transport_handle_queue_full(struct se_cmd *cmd,
77 struct se_device *dev);
78 static void transport_direct_request_timeout(struct se_cmd *cmd);
79 static void transport_free_dev_tasks(struct se_cmd *cmd);
80 static u32 transport_allocate_tasks(struct se_cmd *cmd,
81 unsigned long long starting_lba,
82 enum dma_data_direction data_direction,
83 struct scatterlist *sgl, unsigned int nents);
84 static int transport_generic_get_mem(struct se_cmd *cmd);
85 static void transport_put_cmd(struct se_cmd *cmd);
86 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
87 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
88 static void transport_generic_request_failure(struct se_cmd *, int, int);
89 static void target_complete_ok_work(struct work_struct *work);
91 int init_se_kmem_caches(void)
93 se_cmd_cache = kmem_cache_create("se_cmd_cache",
94 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
96 pr_err("kmem_cache_create for struct se_cmd failed\n");
99 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
100 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
102 if (!se_tmr_req_cache) {
103 pr_err("kmem_cache_create() for struct se_tmr_req"
105 goto out_free_cmd_cache;
107 se_sess_cache = kmem_cache_create("se_sess_cache",
108 sizeof(struct se_session), __alignof__(struct se_session),
110 if (!se_sess_cache) {
111 pr_err("kmem_cache_create() for struct se_session"
113 goto out_free_tmr_req_cache;
115 se_ua_cache = kmem_cache_create("se_ua_cache",
116 sizeof(struct se_ua), __alignof__(struct se_ua),
119 pr_err("kmem_cache_create() for struct se_ua failed\n");
120 goto out_free_sess_cache;
122 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
123 sizeof(struct t10_pr_registration),
124 __alignof__(struct t10_pr_registration), 0, NULL);
125 if (!t10_pr_reg_cache) {
126 pr_err("kmem_cache_create() for struct t10_pr_registration"
128 goto out_free_ua_cache;
130 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
131 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
133 if (!t10_alua_lu_gp_cache) {
134 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
136 goto out_free_pr_reg_cache;
138 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
139 sizeof(struct t10_alua_lu_gp_member),
140 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
141 if (!t10_alua_lu_gp_mem_cache) {
142 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
144 goto out_free_lu_gp_cache;
146 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
147 sizeof(struct t10_alua_tg_pt_gp),
148 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
149 if (!t10_alua_tg_pt_gp_cache) {
150 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
152 goto out_free_lu_gp_mem_cache;
154 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
155 "t10_alua_tg_pt_gp_mem_cache",
156 sizeof(struct t10_alua_tg_pt_gp_member),
157 __alignof__(struct t10_alua_tg_pt_gp_member),
159 if (!t10_alua_tg_pt_gp_mem_cache) {
160 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
162 goto out_free_tg_pt_gp_cache;
165 target_completion_wq = alloc_workqueue("target_completion",
167 if (!target_completion_wq)
168 goto out_free_tg_pt_gp_mem_cache;
172 out_free_tg_pt_gp_mem_cache:
173 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
174 out_free_tg_pt_gp_cache:
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
176 out_free_lu_gp_mem_cache:
177 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
178 out_free_lu_gp_cache:
179 kmem_cache_destroy(t10_alua_lu_gp_cache);
180 out_free_pr_reg_cache:
181 kmem_cache_destroy(t10_pr_reg_cache);
183 kmem_cache_destroy(se_ua_cache);
185 kmem_cache_destroy(se_sess_cache);
186 out_free_tmr_req_cache:
187 kmem_cache_destroy(se_tmr_req_cache);
189 kmem_cache_destroy(se_cmd_cache);
194 void release_se_kmem_caches(void)
196 destroy_workqueue(target_completion_wq);
197 kmem_cache_destroy(se_cmd_cache);
198 kmem_cache_destroy(se_tmr_req_cache);
199 kmem_cache_destroy(se_sess_cache);
200 kmem_cache_destroy(se_ua_cache);
201 kmem_cache_destroy(t10_pr_reg_cache);
202 kmem_cache_destroy(t10_alua_lu_gp_cache);
203 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
205 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
208 /* This code ensures unique mib indexes are handed out. */
209 static DEFINE_SPINLOCK(scsi_mib_index_lock);
210 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
213 * Allocate a new row index for the entry type specified
215 u32 scsi_get_new_index(scsi_index_t type)
219 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
221 spin_lock(&scsi_mib_index_lock);
222 new_index = ++scsi_mib_index[type];
223 spin_unlock(&scsi_mib_index_lock);
228 void transport_init_queue_obj(struct se_queue_obj *qobj)
230 atomic_set(&qobj->queue_cnt, 0);
231 INIT_LIST_HEAD(&qobj->qobj_list);
232 init_waitqueue_head(&qobj->thread_wq);
233 spin_lock_init(&qobj->cmd_queue_lock);
235 EXPORT_SYMBOL(transport_init_queue_obj);
237 static int transport_subsystem_reqmods(void)
241 ret = request_module("target_core_iblock");
243 pr_err("Unable to load target_core_iblock\n");
245 ret = request_module("target_core_file");
247 pr_err("Unable to load target_core_file\n");
249 ret = request_module("target_core_pscsi");
251 pr_err("Unable to load target_core_pscsi\n");
253 ret = request_module("target_core_stgt");
255 pr_err("Unable to load target_core_stgt\n");
260 int transport_subsystem_check_init(void)
264 if (sub_api_initialized)
267 * Request the loading of known TCM subsystem plugins..
269 ret = transport_subsystem_reqmods();
273 sub_api_initialized = 1;
277 struct se_session *transport_init_session(void)
279 struct se_session *se_sess;
281 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
283 pr_err("Unable to allocate struct se_session from"
285 return ERR_PTR(-ENOMEM);
287 INIT_LIST_HEAD(&se_sess->sess_list);
288 INIT_LIST_HEAD(&se_sess->sess_acl_list);
292 EXPORT_SYMBOL(transport_init_session);
295 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
297 void __transport_register_session(
298 struct se_portal_group *se_tpg,
299 struct se_node_acl *se_nacl,
300 struct se_session *se_sess,
301 void *fabric_sess_ptr)
303 unsigned char buf[PR_REG_ISID_LEN];
305 se_sess->se_tpg = se_tpg;
306 se_sess->fabric_sess_ptr = fabric_sess_ptr;
308 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
310 * Only set for struct se_session's that will actually be moving I/O.
311 * eg: *NOT* discovery sessions.
315 * If the fabric module supports an ISID based TransportID,
316 * save this value in binary from the fabric I_T Nexus now.
318 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
319 memset(&buf[0], 0, PR_REG_ISID_LEN);
320 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
321 &buf[0], PR_REG_ISID_LEN);
322 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
324 spin_lock_irq(&se_nacl->nacl_sess_lock);
326 * The se_nacl->nacl_sess pointer will be set to the
327 * last active I_T Nexus for each struct se_node_acl.
329 se_nacl->nacl_sess = se_sess;
331 list_add_tail(&se_sess->sess_acl_list,
332 &se_nacl->acl_sess_list);
333 spin_unlock_irq(&se_nacl->nacl_sess_lock);
335 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
337 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
338 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
340 EXPORT_SYMBOL(__transport_register_session);
342 void transport_register_session(
343 struct se_portal_group *se_tpg,
344 struct se_node_acl *se_nacl,
345 struct se_session *se_sess,
346 void *fabric_sess_ptr)
348 spin_lock_bh(&se_tpg->session_lock);
349 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
350 spin_unlock_bh(&se_tpg->session_lock);
352 EXPORT_SYMBOL(transport_register_session);
354 void transport_deregister_session_configfs(struct se_session *se_sess)
356 struct se_node_acl *se_nacl;
359 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
361 se_nacl = se_sess->se_node_acl;
363 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
364 list_del(&se_sess->sess_acl_list);
366 * If the session list is empty, then clear the pointer.
367 * Otherwise, set the struct se_session pointer from the tail
368 * element of the per struct se_node_acl active session list.
370 if (list_empty(&se_nacl->acl_sess_list))
371 se_nacl->nacl_sess = NULL;
373 se_nacl->nacl_sess = container_of(
374 se_nacl->acl_sess_list.prev,
375 struct se_session, sess_acl_list);
377 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
380 EXPORT_SYMBOL(transport_deregister_session_configfs);
382 void transport_free_session(struct se_session *se_sess)
384 kmem_cache_free(se_sess_cache, se_sess);
386 EXPORT_SYMBOL(transport_free_session);
388 void transport_deregister_session(struct se_session *se_sess)
390 struct se_portal_group *se_tpg = se_sess->se_tpg;
391 struct se_node_acl *se_nacl;
395 transport_free_session(se_sess);
399 spin_lock_irqsave(&se_tpg->session_lock, flags);
400 list_del(&se_sess->sess_list);
401 se_sess->se_tpg = NULL;
402 se_sess->fabric_sess_ptr = NULL;
403 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
406 * Determine if we need to do extra work for this initiator node's
407 * struct se_node_acl if it had been previously dynamically generated.
409 se_nacl = se_sess->se_node_acl;
411 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
412 if (se_nacl->dynamic_node_acl) {
413 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
415 list_del(&se_nacl->acl_list);
416 se_tpg->num_node_acls--;
417 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
419 core_tpg_wait_for_nacl_pr_ref(se_nacl);
420 core_free_device_list_for_node(se_nacl, se_tpg);
421 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
423 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
426 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
429 transport_free_session(se_sess);
431 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
432 se_tpg->se_tpg_tfo->get_fabric_name());
434 EXPORT_SYMBOL(transport_deregister_session);
437 * Called with cmd->t_state_lock held.
439 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
441 struct se_device *dev = cmd->se_dev;
442 struct se_task *task;
448 list_for_each_entry(task, &cmd->t_task_list, t_list) {
449 if (task->task_flags & TF_ACTIVE)
452 if (!atomic_read(&task->task_state_active))
455 spin_lock_irqsave(&dev->execute_task_lock, flags);
456 list_del(&task->t_state_list);
457 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
458 cmd->se_tfo->get_task_tag(cmd), dev, task);
459 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
461 atomic_set(&task->task_state_active, 0);
462 atomic_dec(&cmd->t_task_cdbs_ex_left);
466 /* transport_cmd_check_stop():
468 * 'transport_off = 1' determines if t_transport_active should be cleared.
469 * 'transport_off = 2' determines if task_dev_state should be removed.
471 * A non-zero u8 t_state sets cmd->t_state.
472 * Returns 1 when command is stopped, else 0.
474 static int transport_cmd_check_stop(
481 spin_lock_irqsave(&cmd->t_state_lock, flags);
483 * Determine if IOCTL context caller in requesting the stopping of this
484 * command for LUN shutdown purposes.
486 if (atomic_read(&cmd->transport_lun_stop)) {
487 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
488 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
489 cmd->se_tfo->get_task_tag(cmd));
491 atomic_set(&cmd->t_transport_active, 0);
492 if (transport_off == 2)
493 transport_all_task_dev_remove_state(cmd);
494 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
496 complete(&cmd->transport_lun_stop_comp);
500 * Determine if frontend context caller is requesting the stopping of
501 * this command for frontend exceptions.
503 if (atomic_read(&cmd->t_transport_stop)) {
504 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
505 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
506 cmd->se_tfo->get_task_tag(cmd));
508 if (transport_off == 2)
509 transport_all_task_dev_remove_state(cmd);
512 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
515 if (transport_off == 2)
517 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
519 complete(&cmd->t_transport_stop_comp);
523 atomic_set(&cmd->t_transport_active, 0);
524 if (transport_off == 2) {
525 transport_all_task_dev_remove_state(cmd);
527 * Clear struct se_cmd->se_lun before the transport_off == 2
528 * handoff to fabric module.
532 * Some fabric modules like tcm_loop can release
533 * their internally allocated I/O reference now and
536 if (cmd->se_tfo->check_stop_free != NULL) {
537 spin_unlock_irqrestore(
538 &cmd->t_state_lock, flags);
540 cmd->se_tfo->check_stop_free(cmd);
544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
548 cmd->t_state = t_state;
549 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
554 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
556 return transport_cmd_check_stop(cmd, 2, 0);
559 static void transport_lun_remove_cmd(struct se_cmd *cmd)
561 struct se_lun *lun = cmd->se_lun;
567 spin_lock_irqsave(&cmd->t_state_lock, flags);
568 if (!atomic_read(&cmd->transport_dev_active)) {
569 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
572 atomic_set(&cmd->transport_dev_active, 0);
573 transport_all_task_dev_remove_state(cmd);
574 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
578 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
579 if (atomic_read(&cmd->transport_lun_active)) {
580 list_del(&cmd->se_lun_node);
581 atomic_set(&cmd->transport_lun_active, 0);
583 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
584 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
587 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
590 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
592 if (!cmd->se_tmr_req)
593 transport_lun_remove_cmd(cmd);
595 if (transport_cmd_check_stop_to_fabric(cmd))
598 transport_remove_cmd_from_queue(cmd);
599 transport_put_cmd(cmd);
603 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
606 struct se_device *dev = cmd->se_dev;
607 struct se_queue_obj *qobj = &dev->dev_queue_obj;
611 spin_lock_irqsave(&cmd->t_state_lock, flags);
612 cmd->t_state = t_state;
613 atomic_set(&cmd->t_transport_active, 1);
614 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
617 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
619 /* If the cmd is already on the list, remove it before we add it */
620 if (!list_empty(&cmd->se_queue_node))
621 list_del(&cmd->se_queue_node);
623 atomic_inc(&qobj->queue_cnt);
626 list_add(&cmd->se_queue_node, &qobj->qobj_list);
628 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
629 atomic_set(&cmd->t_transport_queue_active, 1);
630 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
632 wake_up_interruptible(&qobj->thread_wq);
635 static struct se_cmd *
636 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
641 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
642 if (list_empty(&qobj->qobj_list)) {
643 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
648 atomic_set(&cmd->t_transport_queue_active, 0);
650 list_del_init(&cmd->se_queue_node);
651 atomic_dec(&qobj->queue_cnt);
652 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
657 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
659 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
662 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
663 if (!atomic_read(&cmd->t_transport_queue_active)) {
664 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
667 atomic_set(&cmd->t_transport_queue_active, 0);
668 atomic_dec(&qobj->queue_cnt);
669 list_del_init(&cmd->se_queue_node);
670 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
672 if (atomic_read(&cmd->t_transport_queue_active)) {
673 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
674 cmd->se_tfo->get_task_tag(cmd),
675 atomic_read(&cmd->t_transport_queue_active));
680 * Completion function used by TCM subsystem plugins (such as FILEIO)
681 * for queueing up response from struct se_subsystem_api->do_task()
683 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
685 struct se_task *task = list_entry(cmd->t_task_list.next,
686 struct se_task, t_list);
689 cmd->scsi_status = SAM_STAT_GOOD;
690 task->task_scsi_status = GOOD;
692 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
693 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
694 task->task_se_cmd->transport_error_status =
695 PYX_TRANSPORT_ILLEGAL_REQUEST;
698 transport_complete_task(task, good);
700 EXPORT_SYMBOL(transport_complete_sync_cache);
702 static void target_complete_timeout_work(struct work_struct *work)
704 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
708 * Reset cmd->t_se_count to allow transport_put_cmd()
709 * to allow last call to free memory resources.
711 spin_lock_irqsave(&cmd->t_state_lock, flags);
712 if (atomic_read(&cmd->t_transport_timeout) > 1) {
713 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
715 atomic_sub(tmp, &cmd->t_se_count);
717 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
719 transport_put_cmd(cmd);
722 static void target_complete_failure_work(struct work_struct *work)
724 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
726 transport_generic_request_failure(cmd, 1, 1);
729 /* transport_complete_task():
731 * Called from interrupt and non interrupt context depending
732 * on the transport plugin.
734 void transport_complete_task(struct se_task *task, int success)
736 struct se_cmd *cmd = task->task_se_cmd;
737 struct se_device *dev = cmd->se_dev;
740 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
741 cmd->t_task_cdb[0], dev);
744 atomic_inc(&dev->depth_left);
746 del_timer(&task->task_timer);
748 spin_lock_irqsave(&cmd->t_state_lock, flags);
749 task->task_flags &= ~TF_ACTIVE;
752 * See if any sense data exists, if so set the TASK_SENSE flag.
753 * Also check for any other post completion work that needs to be
754 * done by the plugins.
756 if (dev && dev->transport->transport_complete) {
757 if (dev->transport->transport_complete(task) != 0) {
758 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
759 task->task_sense = 1;
765 * See if we are waiting for outstanding struct se_task
766 * to complete for an exception condition
768 if (task->task_flags & TF_REQUEST_STOP) {
770 * Decrement cmd->t_se_count if this task had
771 * previously thrown its timeout exception handler.
773 if (task->task_flags & TF_TIMEOUT) {
774 atomic_dec(&cmd->t_se_count);
775 task->task_flags &= ~TF_TIMEOUT;
777 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
779 complete(&task->task_stop_comp);
783 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
784 * left counter to determine when the struct se_cmd is ready to be queued to
785 * the processing thread.
787 if (task->task_flags & TF_TIMEOUT) {
788 if (!atomic_dec_and_test(&cmd->t_task_cdbs_timeout_left)) {
789 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
792 INIT_WORK(&cmd->work, target_complete_timeout_work);
795 atomic_dec(&cmd->t_task_cdbs_timeout_left);
798 * Decrement the outstanding t_task_cdbs_left count. The last
799 * struct se_task from struct se_cmd will complete itself into the
800 * device queue depending upon int success.
802 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
803 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
807 if (!success || cmd->t_tasks_failed) {
808 if (!task->task_error_status) {
809 task->task_error_status =
810 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
811 cmd->transport_error_status =
812 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
814 INIT_WORK(&cmd->work, target_complete_failure_work);
816 atomic_set(&cmd->t_transport_complete, 1);
817 INIT_WORK(&cmd->work, target_complete_ok_work);
821 cmd->t_state = TRANSPORT_COMPLETE;
822 atomic_set(&cmd->t_transport_active, 1);
823 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
825 queue_work(target_completion_wq, &cmd->work);
827 EXPORT_SYMBOL(transport_complete_task);
830 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
831 * struct se_task list are ready to be added to the active execution list
834 * Called with se_dev_t->execute_task_lock called.
836 static inline int transport_add_task_check_sam_attr(
837 struct se_task *task,
838 struct se_task *task_prev,
839 struct se_device *dev)
842 * No SAM Task attribute emulation enabled, add to tail of
845 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
846 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
850 * HEAD_OF_QUEUE attribute for received CDB, which means
851 * the first task that is associated with a struct se_cmd goes to
852 * head of the struct se_device->execute_task_list, and task_prev
853 * after that for each subsequent task
855 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
856 list_add(&task->t_execute_list,
857 (task_prev != NULL) ?
858 &task_prev->t_execute_list :
859 &dev->execute_task_list);
861 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
862 " in execution queue\n",
863 task->task_se_cmd->t_task_cdb[0]);
867 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
868 * transitioned from Dermant -> Active state, and are added to the end
869 * of the struct se_device->execute_task_list
871 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
875 /* __transport_add_task_to_execute_queue():
877 * Called with se_dev_t->execute_task_lock called.
879 static void __transport_add_task_to_execute_queue(
880 struct se_task *task,
881 struct se_task *task_prev,
882 struct se_device *dev)
886 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
887 atomic_inc(&dev->execute_tasks);
889 if (atomic_read(&task->task_state_active))
892 * Determine if this task needs to go to HEAD_OF_QUEUE for the
893 * state list as well. Running with SAM Task Attribute emulation
894 * will always return head_of_queue == 0 here
897 list_add(&task->t_state_list, (task_prev) ?
898 &task_prev->t_state_list :
899 &dev->state_task_list);
901 list_add_tail(&task->t_state_list, &dev->state_task_list);
903 atomic_set(&task->task_state_active, 1);
905 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
906 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
910 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
912 struct se_device *dev = cmd->se_dev;
913 struct se_task *task;
916 spin_lock_irqsave(&cmd->t_state_lock, flags);
917 list_for_each_entry(task, &cmd->t_task_list, t_list) {
918 if (atomic_read(&task->task_state_active))
921 spin_lock(&dev->execute_task_lock);
922 list_add_tail(&task->t_state_list, &dev->state_task_list);
923 atomic_set(&task->task_state_active, 1);
925 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
926 task->task_se_cmd->se_tfo->get_task_tag(
927 task->task_se_cmd), task, dev);
929 spin_unlock(&dev->execute_task_lock);
931 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
934 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
936 struct se_device *dev = cmd->se_dev;
937 struct se_task *task, *task_prev = NULL;
940 spin_lock_irqsave(&dev->execute_task_lock, flags);
941 list_for_each_entry(task, &cmd->t_task_list, t_list) {
942 if (!list_empty(&task->t_execute_list))
945 * __transport_add_task_to_execute_queue() handles the
946 * SAM Task Attribute emulation if enabled
948 __transport_add_task_to_execute_queue(task, task_prev, dev);
951 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
954 void __transport_remove_task_from_execute_queue(struct se_task *task,
955 struct se_device *dev)
957 list_del_init(&task->t_execute_list);
958 atomic_dec(&dev->execute_tasks);
961 void transport_remove_task_from_execute_queue(
962 struct se_task *task,
963 struct se_device *dev)
967 if (WARN_ON(list_empty(&task->t_execute_list)))
970 spin_lock_irqsave(&dev->execute_task_lock, flags);
971 __transport_remove_task_from_execute_queue(task, dev);
972 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
976 * Handle QUEUE_FULL / -EAGAIN status
979 static void target_qf_do_work(struct work_struct *work)
981 struct se_device *dev = container_of(work, struct se_device,
983 LIST_HEAD(qf_cmd_list);
984 struct se_cmd *cmd, *cmd_tmp;
986 spin_lock_irq(&dev->qf_cmd_lock);
987 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
988 spin_unlock_irq(&dev->qf_cmd_lock);
990 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
991 list_del(&cmd->se_qf_node);
992 atomic_dec(&dev->dev_qf_count);
993 smp_mb__after_atomic_dec();
995 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
996 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
997 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
998 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
1001 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
1005 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1007 switch (cmd->data_direction) {
1010 case DMA_FROM_DEVICE:
1014 case DMA_BIDIRECTIONAL:
1023 void transport_dump_dev_state(
1024 struct se_device *dev,
1028 *bl += sprintf(b + *bl, "Status: ");
1029 switch (dev->dev_status) {
1030 case TRANSPORT_DEVICE_ACTIVATED:
1031 *bl += sprintf(b + *bl, "ACTIVATED");
1033 case TRANSPORT_DEVICE_DEACTIVATED:
1034 *bl += sprintf(b + *bl, "DEACTIVATED");
1036 case TRANSPORT_DEVICE_SHUTDOWN:
1037 *bl += sprintf(b + *bl, "SHUTDOWN");
1039 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1040 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1041 *bl += sprintf(b + *bl, "OFFLINE");
1044 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1048 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1049 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1051 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
1052 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1053 *bl += sprintf(b + *bl, " ");
1056 void transport_dump_vpd_proto_id(
1057 struct t10_vpd *vpd,
1058 unsigned char *p_buf,
1061 unsigned char buf[VPD_TMP_BUF_SIZE];
1064 memset(buf, 0, VPD_TMP_BUF_SIZE);
1065 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1067 switch (vpd->protocol_identifier) {
1069 sprintf(buf+len, "Fibre Channel\n");
1072 sprintf(buf+len, "Parallel SCSI\n");
1075 sprintf(buf+len, "SSA\n");
1078 sprintf(buf+len, "IEEE 1394\n");
1081 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1085 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1088 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1091 sprintf(buf+len, "Automation/Drive Interface Transport"
1095 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1098 sprintf(buf+len, "Unknown 0x%02x\n",
1099 vpd->protocol_identifier);
1104 strncpy(p_buf, buf, p_buf_len);
1106 pr_debug("%s", buf);
1110 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1113 * Check if the Protocol Identifier Valid (PIV) bit is set..
1115 * from spc3r23.pdf section 7.5.1
1117 if (page_83[1] & 0x80) {
1118 vpd->protocol_identifier = (page_83[0] & 0xf0);
1119 vpd->protocol_identifier_set = 1;
1120 transport_dump_vpd_proto_id(vpd, NULL, 0);
1123 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1125 int transport_dump_vpd_assoc(
1126 struct t10_vpd *vpd,
1127 unsigned char *p_buf,
1130 unsigned char buf[VPD_TMP_BUF_SIZE];
1134 memset(buf, 0, VPD_TMP_BUF_SIZE);
1135 len = sprintf(buf, "T10 VPD Identifier Association: ");
1137 switch (vpd->association) {
1139 sprintf(buf+len, "addressed logical unit\n");
1142 sprintf(buf+len, "target port\n");
1145 sprintf(buf+len, "SCSI target device\n");
1148 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1154 strncpy(p_buf, buf, p_buf_len);
1156 pr_debug("%s", buf);
1161 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1164 * The VPD identification association..
1166 * from spc3r23.pdf Section 7.6.3.1 Table 297
1168 vpd->association = (page_83[1] & 0x30);
1169 return transport_dump_vpd_assoc(vpd, NULL, 0);
1171 EXPORT_SYMBOL(transport_set_vpd_assoc);
1173 int transport_dump_vpd_ident_type(
1174 struct t10_vpd *vpd,
1175 unsigned char *p_buf,
1178 unsigned char buf[VPD_TMP_BUF_SIZE];
1182 memset(buf, 0, VPD_TMP_BUF_SIZE);
1183 len = sprintf(buf, "T10 VPD Identifier Type: ");
1185 switch (vpd->device_identifier_type) {
1187 sprintf(buf+len, "Vendor specific\n");
1190 sprintf(buf+len, "T10 Vendor ID based\n");
1193 sprintf(buf+len, "EUI-64 based\n");
1196 sprintf(buf+len, "NAA\n");
1199 sprintf(buf+len, "Relative target port identifier\n");
1202 sprintf(buf+len, "SCSI name string\n");
1205 sprintf(buf+len, "Unsupported: 0x%02x\n",
1206 vpd->device_identifier_type);
1212 if (p_buf_len < strlen(buf)+1)
1214 strncpy(p_buf, buf, p_buf_len);
1216 pr_debug("%s", buf);
1222 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1225 * The VPD identifier type..
1227 * from spc3r23.pdf Section 7.6.3.1 Table 298
1229 vpd->device_identifier_type = (page_83[1] & 0x0f);
1230 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1232 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1234 int transport_dump_vpd_ident(
1235 struct t10_vpd *vpd,
1236 unsigned char *p_buf,
1239 unsigned char buf[VPD_TMP_BUF_SIZE];
1242 memset(buf, 0, VPD_TMP_BUF_SIZE);
1244 switch (vpd->device_identifier_code_set) {
1245 case 0x01: /* Binary */
1246 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1247 &vpd->device_identifier[0]);
1249 case 0x02: /* ASCII */
1250 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1251 &vpd->device_identifier[0]);
1253 case 0x03: /* UTF-8 */
1254 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1255 &vpd->device_identifier[0]);
1258 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1259 " 0x%02x", vpd->device_identifier_code_set);
1265 strncpy(p_buf, buf, p_buf_len);
1267 pr_debug("%s", buf);
1273 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1275 static const char hex_str[] = "0123456789abcdef";
1276 int j = 0, i = 4; /* offset to start of the identifer */
1279 * The VPD Code Set (encoding)
1281 * from spc3r23.pdf Section 7.6.3.1 Table 296
1283 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1284 switch (vpd->device_identifier_code_set) {
1285 case 0x01: /* Binary */
1286 vpd->device_identifier[j++] =
1287 hex_str[vpd->device_identifier_type];
1288 while (i < (4 + page_83[3])) {
1289 vpd->device_identifier[j++] =
1290 hex_str[(page_83[i] & 0xf0) >> 4];
1291 vpd->device_identifier[j++] =
1292 hex_str[page_83[i] & 0x0f];
1296 case 0x02: /* ASCII */
1297 case 0x03: /* UTF-8 */
1298 while (i < (4 + page_83[3]))
1299 vpd->device_identifier[j++] = page_83[i++];
1305 return transport_dump_vpd_ident(vpd, NULL, 0);
1307 EXPORT_SYMBOL(transport_set_vpd_ident);
1309 static void core_setup_task_attr_emulation(struct se_device *dev)
1312 * If this device is from Target_Core_Mod/pSCSI, disable the
1313 * SAM Task Attribute emulation.
1315 * This is currently not available in upsream Linux/SCSI Target
1316 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1318 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1319 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1323 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1324 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1325 " device\n", dev->transport->name,
1326 dev->transport->get_device_rev(dev));
1329 static void scsi_dump_inquiry(struct se_device *dev)
1331 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1334 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1336 pr_debug(" Vendor: ");
1337 for (i = 0; i < 8; i++)
1338 if (wwn->vendor[i] >= 0x20)
1339 pr_debug("%c", wwn->vendor[i]);
1343 pr_debug(" Model: ");
1344 for (i = 0; i < 16; i++)
1345 if (wwn->model[i] >= 0x20)
1346 pr_debug("%c", wwn->model[i]);
1350 pr_debug(" Revision: ");
1351 for (i = 0; i < 4; i++)
1352 if (wwn->revision[i] >= 0x20)
1353 pr_debug("%c", wwn->revision[i]);
1359 device_type = dev->transport->get_device_type(dev);
1360 pr_debug(" Type: %s ", scsi_device_type(device_type));
1361 pr_debug(" ANSI SCSI revision: %02x\n",
1362 dev->transport->get_device_rev(dev));
1365 struct se_device *transport_add_device_to_core_hba(
1367 struct se_subsystem_api *transport,
1368 struct se_subsystem_dev *se_dev,
1370 void *transport_dev,
1371 struct se_dev_limits *dev_limits,
1372 const char *inquiry_prod,
1373 const char *inquiry_rev)
1376 struct se_device *dev;
1378 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1380 pr_err("Unable to allocate memory for se_dev_t\n");
1384 transport_init_queue_obj(&dev->dev_queue_obj);
1385 dev->dev_flags = device_flags;
1386 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1387 dev->dev_ptr = transport_dev;
1389 dev->se_sub_dev = se_dev;
1390 dev->transport = transport;
1391 atomic_set(&dev->active_cmds, 0);
1392 INIT_LIST_HEAD(&dev->dev_list);
1393 INIT_LIST_HEAD(&dev->dev_sep_list);
1394 INIT_LIST_HEAD(&dev->dev_tmr_list);
1395 INIT_LIST_HEAD(&dev->execute_task_list);
1396 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1397 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1398 INIT_LIST_HEAD(&dev->state_task_list);
1399 INIT_LIST_HEAD(&dev->qf_cmd_list);
1400 spin_lock_init(&dev->execute_task_lock);
1401 spin_lock_init(&dev->delayed_cmd_lock);
1402 spin_lock_init(&dev->ordered_cmd_lock);
1403 spin_lock_init(&dev->state_task_lock);
1404 spin_lock_init(&dev->dev_alua_lock);
1405 spin_lock_init(&dev->dev_reservation_lock);
1406 spin_lock_init(&dev->dev_status_lock);
1407 spin_lock_init(&dev->dev_status_thr_lock);
1408 spin_lock_init(&dev->se_port_lock);
1409 spin_lock_init(&dev->se_tmr_lock);
1410 spin_lock_init(&dev->qf_cmd_lock);
1412 dev->queue_depth = dev_limits->queue_depth;
1413 atomic_set(&dev->depth_left, dev->queue_depth);
1414 atomic_set(&dev->dev_ordered_id, 0);
1416 se_dev_set_default_attribs(dev, dev_limits);
1418 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1419 dev->creation_time = get_jiffies_64();
1420 spin_lock_init(&dev->stats_lock);
1422 spin_lock(&hba->device_lock);
1423 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1425 spin_unlock(&hba->device_lock);
1427 * Setup the SAM Task Attribute emulation for struct se_device
1429 core_setup_task_attr_emulation(dev);
1431 * Force PR and ALUA passthrough emulation with internal object use.
1433 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1435 * Setup the Reservations infrastructure for struct se_device
1437 core_setup_reservations(dev, force_pt);
1439 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1441 if (core_setup_alua(dev, force_pt) < 0)
1445 * Startup the struct se_device processing thread
1447 dev->process_thread = kthread_run(transport_processing_thread, dev,
1448 "LIO_%s", dev->transport->name);
1449 if (IS_ERR(dev->process_thread)) {
1450 pr_err("Unable to create kthread: LIO_%s\n",
1451 dev->transport->name);
1455 * Setup work_queue for QUEUE_FULL
1457 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1459 * Preload the initial INQUIRY const values if we are doing
1460 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1461 * passthrough because this is being provided by the backend LLD.
1462 * This is required so that transport_get_inquiry() copies these
1463 * originals once back into DEV_T10_WWN(dev) for the virtual device
1466 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1467 if (!inquiry_prod || !inquiry_rev) {
1468 pr_err("All non TCM/pSCSI plugins require"
1469 " INQUIRY consts\n");
1473 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1474 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1475 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1477 scsi_dump_inquiry(dev);
1481 kthread_stop(dev->process_thread);
1483 spin_lock(&hba->device_lock);
1484 list_del(&dev->dev_list);
1486 spin_unlock(&hba->device_lock);
1488 se_release_vpd_for_dev(dev);
1494 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1496 /* transport_generic_prepare_cdb():
1498 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1499 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1500 * The point of this is since we are mapping iSCSI LUNs to
1501 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1502 * devices and HBAs for a loop.
1504 static inline void transport_generic_prepare_cdb(
1508 case READ_10: /* SBC - RDProtect */
1509 case READ_12: /* SBC - RDProtect */
1510 case READ_16: /* SBC - RDProtect */
1511 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1512 case VERIFY: /* SBC - VRProtect */
1513 case VERIFY_16: /* SBC - VRProtect */
1514 case WRITE_VERIFY: /* SBC - VRProtect */
1515 case WRITE_VERIFY_12: /* SBC - VRProtect */
1518 cdb[1] &= 0x1f; /* clear logical unit number */
1523 static struct se_task *
1524 transport_generic_get_task(struct se_cmd *cmd,
1525 enum dma_data_direction data_direction)
1527 struct se_task *task;
1528 struct se_device *dev = cmd->se_dev;
1530 task = dev->transport->alloc_task(cmd->t_task_cdb);
1532 pr_err("Unable to allocate struct se_task\n");
1536 INIT_LIST_HEAD(&task->t_list);
1537 INIT_LIST_HEAD(&task->t_execute_list);
1538 INIT_LIST_HEAD(&task->t_state_list);
1539 init_timer(&task->task_timer);
1540 init_completion(&task->task_stop_comp);
1541 task->task_se_cmd = cmd;
1542 task->task_data_direction = data_direction;
1547 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1550 * Used by fabric modules containing a local struct se_cmd within their
1551 * fabric dependent per I/O descriptor.
1553 void transport_init_se_cmd(
1555 struct target_core_fabric_ops *tfo,
1556 struct se_session *se_sess,
1560 unsigned char *sense_buffer)
1562 INIT_LIST_HEAD(&cmd->se_lun_node);
1563 INIT_LIST_HEAD(&cmd->se_delayed_node);
1564 INIT_LIST_HEAD(&cmd->se_ordered_node);
1565 INIT_LIST_HEAD(&cmd->se_qf_node);
1566 INIT_LIST_HEAD(&cmd->se_queue_node);
1568 INIT_LIST_HEAD(&cmd->t_task_list);
1569 init_completion(&cmd->transport_lun_fe_stop_comp);
1570 init_completion(&cmd->transport_lun_stop_comp);
1571 init_completion(&cmd->t_transport_stop_comp);
1572 spin_lock_init(&cmd->t_state_lock);
1573 atomic_set(&cmd->transport_dev_active, 1);
1576 cmd->se_sess = se_sess;
1577 cmd->data_length = data_length;
1578 cmd->data_direction = data_direction;
1579 cmd->sam_task_attr = task_attr;
1580 cmd->sense_buffer = sense_buffer;
1582 EXPORT_SYMBOL(transport_init_se_cmd);
1584 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1587 * Check if SAM Task Attribute emulation is enabled for this
1588 * struct se_device storage object
1590 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1593 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1594 pr_debug("SAM Task Attribute ACA"
1595 " emulation is not supported\n");
1599 * Used to determine when ORDERED commands should go from
1600 * Dormant to Active status.
1602 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1603 smp_mb__after_atomic_inc();
1604 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1605 cmd->se_ordered_id, cmd->sam_task_attr,
1606 cmd->se_dev->transport->name);
1610 /* transport_generic_allocate_tasks():
1612 * Called from fabric RX Thread.
1614 int transport_generic_allocate_tasks(
1620 transport_generic_prepare_cdb(cdb);
1622 * Ensure that the received CDB is less than the max (252 + 8) bytes
1623 * for VARIABLE_LENGTH_CMD
1625 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1626 pr_err("Received SCSI CDB with command_size: %d that"
1627 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1628 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1632 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1633 * allocate the additional extended CDB buffer now.. Otherwise
1634 * setup the pointer from __t_task_cdb to t_task_cdb.
1636 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1637 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1639 if (!cmd->t_task_cdb) {
1640 pr_err("Unable to allocate cmd->t_task_cdb"
1641 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1642 scsi_command_size(cdb),
1643 (unsigned long)sizeof(cmd->__t_task_cdb));
1647 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1649 * Copy the original CDB into cmd->
1651 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1653 * Setup the received CDB based on SCSI defined opcodes and
1654 * perform unit attention, persistent reservations and ALUA
1655 * checks for virtual device backends. The cmd->t_task_cdb
1656 * pointer is expected to be setup before we reach this point.
1658 ret = transport_generic_cmd_sequencer(cmd, cdb);
1662 * Check for SAM Task Attribute Emulation
1664 if (transport_check_alloc_task_attr(cmd) < 0) {
1665 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1666 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1669 spin_lock(&cmd->se_lun->lun_sep_lock);
1670 if (cmd->se_lun->lun_sep)
1671 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1672 spin_unlock(&cmd->se_lun->lun_sep_lock);
1675 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1678 * Used by fabric module frontends to queue tasks directly.
1679 * Many only be used from process context only
1681 int transport_handle_cdb_direct(
1688 pr_err("cmd->se_lun is NULL\n");
1691 if (in_interrupt()) {
1693 pr_err("transport_generic_handle_cdb cannot be called"
1694 " from interrupt context\n");
1698 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1699 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1700 * in existing usage to ensure that outstanding descriptors are handled
1701 * correctly during shutdown via transport_wait_for_tasks()
1703 * Also, we don't take cmd->t_state_lock here as we only expect
1704 * this to be called for initial descriptor submission.
1706 cmd->t_state = TRANSPORT_NEW_CMD;
1707 atomic_set(&cmd->t_transport_active, 1);
1709 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1710 * so follow TRANSPORT_NEW_CMD processing thread context usage
1711 * and call transport_generic_request_failure() if necessary..
1713 ret = transport_generic_new_cmd(cmd);
1717 cmd->transport_error_status = ret;
1718 transport_generic_request_failure(cmd, 0,
1719 (cmd->data_direction != DMA_TO_DEVICE));
1723 EXPORT_SYMBOL(transport_handle_cdb_direct);
1726 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1727 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1728 * complete setup in TCM process context w/ TFO->new_cmd_map().
1730 int transport_generic_handle_cdb_map(
1735 pr_err("cmd->se_lun is NULL\n");
1739 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1742 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1744 /* transport_generic_handle_data():
1748 int transport_generic_handle_data(
1752 * For the software fabric case, then we assume the nexus is being
1753 * failed/shutdown when signals are pending from the kthread context
1754 * caller, so we return a failure. For the HW target mode case running
1755 * in interrupt code, the signal_pending() check is skipped.
1757 if (!in_interrupt() && signal_pending(current))
1760 * If the received CDB has aleady been ABORTED by the generic
1761 * target engine, we now call transport_check_aborted_status()
1762 * to queue any delated TASK_ABORTED status for the received CDB to the
1763 * fabric module as we are expecting no further incoming DATA OUT
1764 * sequences at this point.
1766 if (transport_check_aborted_status(cmd, 1) != 0)
1769 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1772 EXPORT_SYMBOL(transport_generic_handle_data);
1774 /* transport_generic_handle_tmr():
1778 int transport_generic_handle_tmr(
1781 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1784 EXPORT_SYMBOL(transport_generic_handle_tmr);
1786 void transport_generic_free_cmd_intr(
1789 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
1791 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1794 * If the task is active, request it to be stopped and sleep until it
1797 bool target_stop_task(struct se_task *task, unsigned long *flags)
1799 struct se_cmd *cmd = task->task_se_cmd;
1800 bool was_active = false;
1802 if (task->task_flags & TF_ACTIVE) {
1803 task->task_flags |= TF_REQUEST_STOP;
1804 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1806 pr_debug("Task %p waiting to complete\n", task);
1807 del_timer_sync(&task->task_timer);
1808 wait_for_completion(&task->task_stop_comp);
1809 pr_debug("Task %p stopped successfully\n", task);
1811 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1812 atomic_dec(&cmd->t_task_cdbs_left);
1813 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1820 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1822 struct se_task *task, *task_tmp;
1823 unsigned long flags;
1826 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1827 cmd->se_tfo->get_task_tag(cmd));
1830 * No tasks remain in the execution queue
1832 spin_lock_irqsave(&cmd->t_state_lock, flags);
1833 list_for_each_entry_safe(task, task_tmp,
1834 &cmd->t_task_list, t_list) {
1835 pr_debug("Processing task %p\n", task);
1837 * If the struct se_task has not been sent and is not active,
1838 * remove the struct se_task from the execution queue.
1840 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1841 spin_unlock_irqrestore(&cmd->t_state_lock,
1843 transport_remove_task_from_execute_queue(task,
1846 pr_debug("Task %p removed from execute queue\n", task);
1847 spin_lock_irqsave(&cmd->t_state_lock, flags);
1851 if (!target_stop_task(task, &flags)) {
1852 pr_debug("Task %p - did nothing\n", task);
1856 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1862 * Handle SAM-esque emulation for generic transport request failures.
1864 static void transport_generic_request_failure(
1871 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1872 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1873 cmd->t_task_cdb[0]);
1874 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
1875 cmd->se_tfo->get_cmd_state(cmd),
1877 cmd->transport_error_status);
1878 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1879 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1880 " t_transport_active: %d t_transport_stop: %d"
1881 " t_transport_sent: %d\n", cmd->t_task_list_num,
1882 atomic_read(&cmd->t_task_cdbs_left),
1883 atomic_read(&cmd->t_task_cdbs_sent),
1884 atomic_read(&cmd->t_task_cdbs_ex_left),
1885 atomic_read(&cmd->t_transport_active),
1886 atomic_read(&cmd->t_transport_stop),
1887 atomic_read(&cmd->t_transport_sent));
1890 * For SAM Task Attribute emulation for failed struct se_cmd
1892 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1893 transport_complete_task_attr(cmd);
1896 transport_direct_request_timeout(cmd);
1897 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1900 switch (cmd->transport_error_status) {
1901 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1902 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1904 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1905 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1907 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1908 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1910 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1911 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1913 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1915 transport_new_cmd_failure(cmd);
1917 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1918 * we force this session to fall back to session
1921 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1922 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1925 case PYX_TRANSPORT_LU_COMM_FAILURE:
1926 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1927 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1929 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1930 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1932 case PYX_TRANSPORT_WRITE_PROTECTED:
1933 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1935 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1937 * No SENSE Data payload for this case, set SCSI Status
1938 * and queue the response to $FABRIC_MOD.
1940 * Uses linux/include/scsi/scsi.h SAM status codes defs
1942 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1944 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1945 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1948 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1951 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1952 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1953 cmd->orig_fe_lun, 0x2C,
1954 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1956 ret = cmd->se_tfo->queue_status(cmd);
1960 case PYX_TRANSPORT_USE_SENSE_REASON:
1962 * struct se_cmd->scsi_sense_reason already set
1966 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1968 cmd->transport_error_status);
1969 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1973 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1974 * make the call to transport_send_check_condition_and_sense()
1975 * directly. Otherwise expect the fabric to make the call to
1976 * transport_send_check_condition_and_sense() after handling
1977 * possible unsoliticied write data payloads.
1979 if (!sc && !cmd->se_tfo->new_cmd_map)
1980 transport_new_cmd_failure(cmd);
1982 ret = transport_send_check_condition_and_sense(cmd,
1983 cmd->scsi_sense_reason, 0);
1989 transport_lun_remove_cmd(cmd);
1990 if (!transport_cmd_check_stop_to_fabric(cmd))
1995 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1996 transport_handle_queue_full(cmd, cmd->se_dev);
1999 static void transport_direct_request_timeout(struct se_cmd *cmd)
2001 unsigned long flags;
2003 spin_lock_irqsave(&cmd->t_state_lock, flags);
2004 if (!atomic_read(&cmd->t_transport_timeout)) {
2005 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2008 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2009 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2013 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2015 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2018 static inline u32 transport_lba_21(unsigned char *cdb)
2020 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2023 static inline u32 transport_lba_32(unsigned char *cdb)
2025 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2028 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2030 unsigned int __v1, __v2;
2032 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2033 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2035 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2039 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2041 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2043 unsigned int __v1, __v2;
2045 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2046 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2048 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2051 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2053 unsigned long flags;
2055 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2056 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2057 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2061 * Called from interrupt context.
2063 static void transport_task_timeout_handler(unsigned long data)
2065 struct se_task *task = (struct se_task *)data;
2066 struct se_cmd *cmd = task->task_se_cmd;
2067 unsigned long flags;
2069 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2071 spin_lock_irqsave(&cmd->t_state_lock, flags);
2074 * Determine if transport_complete_task() has already been called.
2076 if (!(task->task_flags & TF_ACTIVE)) {
2077 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2079 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2083 atomic_inc(&cmd->t_se_count);
2084 atomic_inc(&cmd->t_transport_timeout);
2085 cmd->t_tasks_failed = 1;
2087 task->task_flags |= TF_TIMEOUT;
2088 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2089 task->task_scsi_status = 1;
2091 if (task->task_flags & TF_REQUEST_STOP) {
2092 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2093 " == 1\n", task, cmd);
2094 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2095 complete(&task->task_stop_comp);
2099 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2100 pr_debug("transport task: %p cmd: %p timeout non zero"
2101 " t_task_cdbs_left\n", task, cmd);
2102 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2105 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2108 INIT_WORK(&cmd->work, target_complete_failure_work);
2109 cmd->t_state = TRANSPORT_COMPLETE;
2110 atomic_set(&cmd->t_transport_active, 1);
2111 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2113 queue_work(target_completion_wq, &cmd->work);
2116 static void transport_start_task_timer(struct se_task *task)
2118 struct se_device *dev = task->task_se_cmd->se_dev;
2122 * If the task_timeout is disabled, exit now.
2124 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
2128 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2129 task->task_timer.data = (unsigned long) task;
2130 task->task_timer.function = transport_task_timeout_handler;
2131 add_timer(&task->task_timer);
2134 static inline int transport_tcq_window_closed(struct se_device *dev)
2136 if (dev->dev_tcq_window_closed++ <
2137 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2138 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2140 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2142 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2147 * Called from Fabric Module context from transport_execute_tasks()
2149 * The return of this function determins if the tasks from struct se_cmd
2150 * get added to the execution queue in transport_execute_tasks(),
2151 * or are added to the delayed or ordered lists here.
2153 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2155 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2158 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2159 * to allow the passed struct se_cmd list of tasks to the front of the list.
2161 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2162 atomic_inc(&cmd->se_dev->dev_hoq_count);
2163 smp_mb__after_atomic_inc();
2164 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2165 " 0x%02x, se_ordered_id: %u\n",
2167 cmd->se_ordered_id);
2169 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2170 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2171 list_add_tail(&cmd->se_ordered_node,
2172 &cmd->se_dev->ordered_cmd_list);
2173 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2175 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2176 smp_mb__after_atomic_inc();
2178 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2179 " list, se_ordered_id: %u\n",
2181 cmd->se_ordered_id);
2183 * Add ORDERED command to tail of execution queue if
2184 * no other older commands exist that need to be
2187 if (!atomic_read(&cmd->se_dev->simple_cmds))
2191 * For SIMPLE and UNTAGGED Task Attribute commands
2193 atomic_inc(&cmd->se_dev->simple_cmds);
2194 smp_mb__after_atomic_inc();
2197 * Otherwise if one or more outstanding ORDERED task attribute exist,
2198 * add the dormant task(s) built for the passed struct se_cmd to the
2199 * execution queue and become in Active state for this struct se_device.
2201 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2203 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2204 * will be drained upon completion of HEAD_OF_QUEUE task.
2206 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2207 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2208 list_add_tail(&cmd->se_delayed_node,
2209 &cmd->se_dev->delayed_cmd_list);
2210 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2212 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2213 " delayed CMD list, se_ordered_id: %u\n",
2214 cmd->t_task_cdb[0], cmd->sam_task_attr,
2215 cmd->se_ordered_id);
2217 * Return zero to let transport_execute_tasks() know
2218 * not to add the delayed tasks to the execution list.
2223 * Otherwise, no ORDERED task attributes exist..
2229 * Called from fabric module context in transport_generic_new_cmd() and
2230 * transport_generic_process_write()
2232 static int transport_execute_tasks(struct se_cmd *cmd)
2236 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2237 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2238 transport_generic_request_failure(cmd, 0, 1);
2243 * Call transport_cmd_check_stop() to see if a fabric exception
2244 * has occurred that prevents execution.
2246 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2248 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2249 * attribute for the tasks of the received struct se_cmd CDB
2251 add_tasks = transport_execute_task_attr(cmd);
2255 * This calls transport_add_tasks_from_cmd() to handle
2256 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2257 * (if enabled) in __transport_add_task_to_execute_queue() and
2258 * transport_add_task_check_sam_attr().
2260 transport_add_tasks_from_cmd(cmd);
2263 * Kick the execution queue for the cmd associated struct se_device
2267 __transport_execute_tasks(cmd->se_dev);
2272 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2273 * from struct se_device->execute_task_list and
2275 * Called from transport_processing_thread()
2277 static int __transport_execute_tasks(struct se_device *dev)
2280 struct se_cmd *cmd = NULL;
2281 struct se_task *task = NULL;
2282 unsigned long flags;
2285 * Check if there is enough room in the device and HBA queue to send
2286 * struct se_tasks to the selected transport.
2289 if (!atomic_read(&dev->depth_left))
2290 return transport_tcq_window_closed(dev);
2292 dev->dev_tcq_window_closed = 0;
2294 spin_lock_irq(&dev->execute_task_lock);
2295 if (list_empty(&dev->execute_task_list)) {
2296 spin_unlock_irq(&dev->execute_task_lock);
2299 task = list_first_entry(&dev->execute_task_list,
2300 struct se_task, t_execute_list);
2301 __transport_remove_task_from_execute_queue(task, dev);
2302 spin_unlock_irq(&dev->execute_task_lock);
2304 atomic_dec(&dev->depth_left);
2306 cmd = task->task_se_cmd;
2308 spin_lock_irqsave(&cmd->t_state_lock, flags);
2309 task->task_flags |= (TF_ACTIVE | TF_SENT);
2310 atomic_inc(&cmd->t_task_cdbs_sent);
2312 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2313 cmd->t_task_list_num)
2314 atomic_set(&cmd->transport_sent, 1);
2316 transport_start_task_timer(task);
2317 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2319 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2320 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2321 * struct se_subsystem_api->do_task() caller below.
2323 if (cmd->transport_emulate_cdb) {
2324 error = cmd->transport_emulate_cdb(cmd);
2326 cmd->transport_error_status = error;
2327 spin_lock_irqsave(&cmd->t_state_lock, flags);
2328 task->task_flags &= ~TF_ACTIVE;
2329 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2330 del_timer_sync(&task->task_timer);
2331 atomic_set(&cmd->transport_sent, 0);
2332 transport_stop_tasks_for_cmd(cmd);
2333 atomic_inc(&dev->depth_left);
2334 transport_generic_request_failure(cmd, 0, 1);
2338 * Handle the successful completion for transport_emulate_cdb()
2339 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2340 * Otherwise the caller is expected to complete the task with
2343 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2344 cmd->scsi_status = SAM_STAT_GOOD;
2345 task->task_scsi_status = GOOD;
2346 transport_complete_task(task, 1);
2350 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2351 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2352 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2353 * LUN emulation code.
2355 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2356 * call ->do_task() directly and let the underlying TCM subsystem plugin
2357 * code handle the CDB emulation.
2359 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2360 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2361 error = transport_emulate_control_cdb(task);
2363 error = dev->transport->do_task(task);
2366 cmd->transport_error_status = error;
2367 spin_lock_irqsave(&cmd->t_state_lock, flags);
2368 task->task_flags &= ~TF_ACTIVE;
2369 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2370 del_timer_sync(&task->task_timer);
2371 atomic_set(&cmd->transport_sent, 0);
2372 transport_stop_tasks_for_cmd(cmd);
2373 atomic_inc(&dev->depth_left);
2374 transport_generic_request_failure(cmd, 0, 1);
2383 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2385 unsigned long flags;
2387 * Any unsolicited data will get dumped for failed command inside of
2390 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2391 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2392 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2393 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2396 static inline u32 transport_get_sectors_6(
2401 struct se_device *dev = cmd->se_dev;
2404 * Assume TYPE_DISK for non struct se_device objects.
2405 * Use 8-bit sector value.
2411 * Use 24-bit allocation length for TYPE_TAPE.
2413 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2414 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2417 * Everything else assume TYPE_DISK Sector CDB location.
2418 * Use 8-bit sector value.
2424 static inline u32 transport_get_sectors_10(
2429 struct se_device *dev = cmd->se_dev;
2432 * Assume TYPE_DISK for non struct se_device objects.
2433 * Use 16-bit sector value.
2439 * XXX_10 is not defined in SSC, throw an exception
2441 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2447 * Everything else assume TYPE_DISK Sector CDB location.
2448 * Use 16-bit sector value.
2451 return (u32)(cdb[7] << 8) + cdb[8];
2454 static inline u32 transport_get_sectors_12(
2459 struct se_device *dev = cmd->se_dev;
2462 * Assume TYPE_DISK for non struct se_device objects.
2463 * Use 32-bit sector value.
2469 * XXX_12 is not defined in SSC, throw an exception
2471 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2477 * Everything else assume TYPE_DISK Sector CDB location.
2478 * Use 32-bit sector value.
2481 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2484 static inline u32 transport_get_sectors_16(
2489 struct se_device *dev = cmd->se_dev;
2492 * Assume TYPE_DISK for non struct se_device objects.
2493 * Use 32-bit sector value.
2499 * Use 24-bit allocation length for TYPE_TAPE.
2501 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2502 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2505 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2506 (cdb[12] << 8) + cdb[13];
2510 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2512 static inline u32 transport_get_sectors_32(
2518 * Assume TYPE_DISK for non struct se_device objects.
2519 * Use 32-bit sector value.
2521 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2522 (cdb[30] << 8) + cdb[31];
2526 static inline u32 transport_get_size(
2531 struct se_device *dev = cmd->se_dev;
2533 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2534 if (cdb[1] & 1) { /* sectors */
2535 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2540 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2541 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2542 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2543 dev->transport->name);
2545 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2548 static void transport_xor_callback(struct se_cmd *cmd)
2550 unsigned char *buf, *addr;
2551 struct scatterlist *sg;
2552 unsigned int offset;
2556 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2558 * 1) read the specified logical block(s);
2559 * 2) transfer logical blocks from the data-out buffer;
2560 * 3) XOR the logical blocks transferred from the data-out buffer with
2561 * the logical blocks read, storing the resulting XOR data in a buffer;
2562 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2563 * blocks transferred from the data-out buffer; and
2564 * 5) transfer the resulting XOR data to the data-in buffer.
2566 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2568 pr_err("Unable to allocate xor_callback buf\n");
2572 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2573 * into the locally allocated *buf
2575 sg_copy_to_buffer(cmd->t_data_sg,
2581 * Now perform the XOR against the BIDI read memory located at
2582 * cmd->t_mem_bidi_list
2586 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2587 addr = kmap_atomic(sg_page(sg), KM_USER0);
2591 for (i = 0; i < sg->length; i++)
2592 *(addr + sg->offset + i) ^= *(buf + offset + i);
2594 offset += sg->length;
2595 kunmap_atomic(addr, KM_USER0);
2603 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2605 static int transport_get_sense_data(struct se_cmd *cmd)
2607 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2608 struct se_device *dev = cmd->se_dev;
2609 struct se_task *task = NULL, *task_tmp;
2610 unsigned long flags;
2613 WARN_ON(!cmd->se_lun);
2618 spin_lock_irqsave(&cmd->t_state_lock, flags);
2619 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2620 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2624 list_for_each_entry_safe(task, task_tmp,
2625 &cmd->t_task_list, t_list) {
2626 if (!task->task_sense)
2629 if (!dev->transport->get_sense_buffer) {
2630 pr_err("dev->transport->get_sense_buffer"
2635 sense_buffer = dev->transport->get_sense_buffer(task);
2636 if (!sense_buffer) {
2637 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2638 " sense buffer for task with sense\n",
2639 cmd->se_tfo->get_task_tag(cmd), task);
2642 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2644 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2645 TRANSPORT_SENSE_BUFFER);
2647 memcpy(&buffer[offset], sense_buffer,
2648 TRANSPORT_SENSE_BUFFER);
2649 cmd->scsi_status = task->task_scsi_status;
2650 /* Automatically padded */
2651 cmd->scsi_sense_length =
2652 (TRANSPORT_SENSE_BUFFER + offset);
2654 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2656 dev->se_hba->hba_id, dev->transport->name,
2660 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2666 transport_handle_reservation_conflict(struct se_cmd *cmd)
2668 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2669 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2670 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2672 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2673 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2676 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2679 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2680 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2681 cmd->orig_fe_lun, 0x2C,
2682 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2686 static inline long long transport_dev_end_lba(struct se_device *dev)
2688 return dev->transport->get_blocks(dev) + 1;
2691 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2693 struct se_device *dev = cmd->se_dev;
2696 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2699 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2701 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2702 pr_err("LBA: %llu Sectors: %u exceeds"
2703 " transport_dev_end_lba(): %llu\n",
2704 cmd->t_task_lba, sectors,
2705 transport_dev_end_lba(dev));
2712 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2715 * Determine if the received WRITE_SAME is used to for direct
2716 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2717 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2718 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2720 int passthrough = (dev->transport->transport_type ==
2721 TRANSPORT_PLUGIN_PHBA_PDEV);
2724 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2725 pr_err("WRITE_SAME PBDATA and LBDATA"
2726 " bits not supported for Block Discard"
2731 * Currently for the emulated case we only accept
2732 * tpws with the UNMAP=1 bit set.
2734 if (!(flags[0] & 0x08)) {
2735 pr_err("WRITE_SAME w/o UNMAP bit not"
2736 " supported for Block Discard Emulation\n");
2744 /* transport_generic_cmd_sequencer():
2746 * Generic Command Sequencer that should work for most DAS transport
2749 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2752 * FIXME: Need to support other SCSI OPCODES where as well.
2754 static int transport_generic_cmd_sequencer(
2758 struct se_device *dev = cmd->se_dev;
2759 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2760 int ret = 0, sector_ret = 0, passthrough;
2761 u32 sectors = 0, size = 0, pr_reg_type = 0;
2765 * Check for an existing UNIT ATTENTION condition
2767 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2768 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2769 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2773 * Check status of Asymmetric Logical Unit Assignment port
2775 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2778 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2779 * The ALUA additional sense code qualifier (ASCQ) is determined
2780 * by the ALUA primary or secondary access state..
2784 pr_debug("[%s]: ALUA TG Port not available,"
2785 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2786 cmd->se_tfo->get_fabric_name(), alua_ascq);
2788 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2789 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2790 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2793 goto out_invalid_cdb_field;
2796 * Check status for SPC-3 Persistent Reservations
2798 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2799 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2800 cmd, cdb, pr_reg_type) != 0)
2801 return transport_handle_reservation_conflict(cmd);
2803 * This means the CDB is allowed for the SCSI Initiator port
2804 * when said port is *NOT* holding the legacy SPC-2 or
2805 * SPC-3 Persistent Reservation.
2811 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2813 goto out_unsupported_cdb;
2814 size = transport_get_size(sectors, cdb, cmd);
2815 cmd->t_task_lba = transport_lba_21(cdb);
2816 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2819 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2821 goto out_unsupported_cdb;
2822 size = transport_get_size(sectors, cdb, cmd);
2823 cmd->t_task_lba = transport_lba_32(cdb);
2824 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2827 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2829 goto out_unsupported_cdb;
2830 size = transport_get_size(sectors, cdb, cmd);
2831 cmd->t_task_lba = transport_lba_32(cdb);
2832 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2835 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2837 goto out_unsupported_cdb;
2838 size = transport_get_size(sectors, cdb, cmd);
2839 cmd->t_task_lba = transport_lba_64(cdb);
2840 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
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->t_tasks_fua = (cdb[1] & 0x8);
2857 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2860 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2862 goto out_unsupported_cdb;
2863 size = transport_get_size(sectors, cdb, cmd);
2864 cmd->t_task_lba = transport_lba_32(cdb);
2865 cmd->t_tasks_fua = (cdb[1] & 0x8);
2866 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2869 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2871 goto out_unsupported_cdb;
2872 size = transport_get_size(sectors, cdb, cmd);
2873 cmd->t_task_lba = transport_lba_64(cdb);
2874 cmd->t_tasks_fua = (cdb[1] & 0x8);
2875 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2877 case XDWRITEREAD_10:
2878 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2879 !(cmd->t_tasks_bidi))
2880 goto out_invalid_cdb_field;
2881 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2883 goto out_unsupported_cdb;
2884 size = transport_get_size(sectors, cdb, cmd);
2885 cmd->t_task_lba = transport_lba_32(cdb);
2886 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2887 passthrough = (dev->transport->transport_type ==
2888 TRANSPORT_PLUGIN_PHBA_PDEV);
2890 * Skip the remaining assignments for TCM/PSCSI passthrough
2895 * Setup BIDI XOR callback to be run after I/O completion.
2897 cmd->transport_complete_callback = &transport_xor_callback;
2898 cmd->t_tasks_fua = (cdb[1] & 0x8);
2900 case VARIABLE_LENGTH_CMD:
2901 service_action = get_unaligned_be16(&cdb[8]);
2903 * Determine if this is TCM/PSCSI device and we should disable
2904 * internal emulation for this CDB.
2906 passthrough = (dev->transport->transport_type ==
2907 TRANSPORT_PLUGIN_PHBA_PDEV);
2909 switch (service_action) {
2910 case XDWRITEREAD_32:
2911 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2913 goto out_unsupported_cdb;
2914 size = transport_get_size(sectors, cdb, cmd);
2916 * Use WRITE_32 and READ_32 opcodes for the emulated
2917 * XDWRITE_READ_32 logic.
2919 cmd->t_task_lba = transport_lba_64_ext(cdb);
2920 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2923 * Skip the remaining assignments for TCM/PSCSI passthrough
2929 * Setup BIDI XOR callback to be run during after I/O
2932 cmd->transport_complete_callback = &transport_xor_callback;
2933 cmd->t_tasks_fua = (cdb[10] & 0x8);
2936 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2938 goto out_unsupported_cdb;
2941 size = transport_get_size(1, cdb, cmd);
2943 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2945 goto out_invalid_cdb_field;
2948 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2949 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2951 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2952 goto out_invalid_cdb_field;
2956 pr_err("VARIABLE_LENGTH_CMD service action"
2957 " 0x%04x not supported\n", service_action);
2958 goto out_unsupported_cdb;
2961 case MAINTENANCE_IN:
2962 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2963 /* MAINTENANCE_IN from SCC-2 */
2965 * Check for emulated MI_REPORT_TARGET_PGS.
2967 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2968 cmd->transport_emulate_cdb =
2969 (su_dev->t10_alua.alua_type ==
2970 SPC3_ALUA_EMULATED) ?
2971 core_emulate_report_target_port_groups :
2974 size = (cdb[6] << 24) | (cdb[7] << 16) |
2975 (cdb[8] << 8) | cdb[9];
2977 /* GPCMD_SEND_KEY from multi media commands */
2978 size = (cdb[8] << 8) + cdb[9];
2980 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2984 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2986 case MODE_SELECT_10:
2987 size = (cdb[7] << 8) + cdb[8];
2988 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2992 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2995 case GPCMD_READ_BUFFER_CAPACITY:
2996 case GPCMD_SEND_OPC:
2999 size = (cdb[7] << 8) + cdb[8];
3000 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3002 case READ_BLOCK_LIMITS:
3003 size = READ_BLOCK_LEN;
3004 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3006 case GPCMD_GET_CONFIGURATION:
3007 case GPCMD_READ_FORMAT_CAPACITIES:
3008 case GPCMD_READ_DISC_INFO:
3009 case GPCMD_READ_TRACK_RZONE_INFO:
3010 size = (cdb[7] << 8) + cdb[8];
3011 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3013 case PERSISTENT_RESERVE_IN:
3014 case PERSISTENT_RESERVE_OUT:
3015 cmd->transport_emulate_cdb =
3016 (su_dev->t10_pr.res_type ==
3017 SPC3_PERSISTENT_RESERVATIONS) ?
3018 core_scsi3_emulate_pr : NULL;
3019 size = (cdb[7] << 8) + cdb[8];
3020 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3022 case GPCMD_MECHANISM_STATUS:
3023 case GPCMD_READ_DVD_STRUCTURE:
3024 size = (cdb[8] << 8) + cdb[9];
3025 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3028 size = READ_POSITION_LEN;
3029 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3031 case MAINTENANCE_OUT:
3032 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3033 /* MAINTENANCE_OUT from SCC-2
3035 * Check for emulated MO_SET_TARGET_PGS.
3037 if (cdb[1] == MO_SET_TARGET_PGS) {
3038 cmd->transport_emulate_cdb =
3039 (su_dev->t10_alua.alua_type ==
3040 SPC3_ALUA_EMULATED) ?
3041 core_emulate_set_target_port_groups :
3045 size = (cdb[6] << 24) | (cdb[7] << 16) |
3046 (cdb[8] << 8) | cdb[9];
3048 /* GPCMD_REPORT_KEY from multi media commands */
3049 size = (cdb[8] << 8) + cdb[9];
3051 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3054 size = (cdb[3] << 8) + cdb[4];
3056 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3057 * See spc4r17 section 5.3
3059 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3060 cmd->sam_task_attr = MSG_HEAD_TAG;
3061 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3064 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3065 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3068 size = READ_CAP_LEN;
3069 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3071 case READ_MEDIA_SERIAL_NUMBER:
3072 case SECURITY_PROTOCOL_IN:
3073 case SECURITY_PROTOCOL_OUT:
3074 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3075 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3077 case SERVICE_ACTION_IN:
3078 case ACCESS_CONTROL_IN:
3079 case ACCESS_CONTROL_OUT:
3081 case READ_ATTRIBUTE:
3082 case RECEIVE_COPY_RESULTS:
3083 case WRITE_ATTRIBUTE:
3084 size = (cdb[10] << 24) | (cdb[11] << 16) |
3085 (cdb[12] << 8) | cdb[13];
3086 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3088 case RECEIVE_DIAGNOSTIC:
3089 case SEND_DIAGNOSTIC:
3090 size = (cdb[3] << 8) | cdb[4];
3091 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3093 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3096 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3097 size = (2336 * sectors);
3098 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3103 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3107 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3109 case READ_ELEMENT_STATUS:
3110 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3111 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3114 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3115 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3120 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3121 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3123 if (cdb[0] == RESERVE_10)
3124 size = (cdb[7] << 8) | cdb[8];
3126 size = cmd->data_length;
3129 * Setup the legacy emulated handler for SPC-2 and
3130 * >= SPC-3 compatible reservation handling (CRH=1)
3131 * Otherwise, we assume the underlying SCSI logic is
3132 * is running in SPC_PASSTHROUGH, and wants reservations
3133 * emulation disabled.
3135 cmd->transport_emulate_cdb =
3136 (su_dev->t10_pr.res_type !=
3138 core_scsi2_emulate_crh : NULL;
3139 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3144 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3145 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3147 if (cdb[0] == RELEASE_10)
3148 size = (cdb[7] << 8) | cdb[8];
3150 size = cmd->data_length;
3152 cmd->transport_emulate_cdb =
3153 (su_dev->t10_pr.res_type !=
3155 core_scsi2_emulate_crh : NULL;
3156 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3158 case SYNCHRONIZE_CACHE:
3159 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3161 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3163 if (cdb[0] == SYNCHRONIZE_CACHE) {
3164 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3165 cmd->t_task_lba = transport_lba_32(cdb);
3167 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3168 cmd->t_task_lba = transport_lba_64(cdb);
3171 goto out_unsupported_cdb;
3173 size = transport_get_size(sectors, cdb, cmd);
3174 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3177 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3179 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3182 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3183 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3185 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3187 * Check to ensure that LBA + Range does not exceed past end of
3188 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3190 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3191 if (transport_cmd_get_valid_sectors(cmd) < 0)
3192 goto out_invalid_cdb_field;
3196 size = get_unaligned_be16(&cdb[7]);
3197 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3200 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3202 goto out_unsupported_cdb;
3205 size = transport_get_size(1, cdb, cmd);
3207 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3208 goto out_invalid_cdb_field;
3211 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3212 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3214 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3215 goto out_invalid_cdb_field;
3218 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3220 goto out_unsupported_cdb;
3223 size = transport_get_size(1, cdb, cmd);
3225 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3226 goto out_invalid_cdb_field;
3229 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3230 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3232 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3233 * of byte 1 bit 3 UNMAP instead of original reserved field
3235 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3236 goto out_invalid_cdb_field;
3238 case ALLOW_MEDIUM_REMOVAL:
3239 case GPCMD_CLOSE_TRACK:
3241 case INITIALIZE_ELEMENT_STATUS:
3242 case GPCMD_LOAD_UNLOAD:
3245 case GPCMD_SET_SPEED:
3248 case TEST_UNIT_READY:
3250 case WRITE_FILEMARKS:
3252 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3255 cmd->transport_emulate_cdb =
3256 transport_core_report_lun_response;
3257 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3259 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3260 * See spc4r17 section 5.3
3262 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3263 cmd->sam_task_attr = MSG_HEAD_TAG;
3264 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3267 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3268 " 0x%02x, sending CHECK_CONDITION.\n",
3269 cmd->se_tfo->get_fabric_name(), cdb[0]);
3270 goto out_unsupported_cdb;
3273 if (size != cmd->data_length) {
3274 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3275 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3276 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3277 cmd->data_length, size, cdb[0]);
3279 cmd->cmd_spdtl = size;
3281 if (cmd->data_direction == DMA_TO_DEVICE) {
3282 pr_err("Rejecting underflow/overflow"
3284 goto out_invalid_cdb_field;
3287 * Reject READ_* or WRITE_* with overflow/underflow for
3288 * type SCF_SCSI_DATA_SG_IO_CDB.
3290 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3291 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3292 " CDB on non 512-byte sector setup subsystem"
3293 " plugin: %s\n", dev->transport->name);
3294 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3295 goto out_invalid_cdb_field;
3298 if (size > cmd->data_length) {
3299 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3300 cmd->residual_count = (size - cmd->data_length);
3302 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3303 cmd->residual_count = (cmd->data_length - size);
3305 cmd->data_length = size;
3308 /* Let's limit control cdbs to a page, for simplicity's sake. */
3309 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3311 goto out_invalid_cdb_field;
3313 transport_set_supported_SAM_opcode(cmd);
3316 out_unsupported_cdb:
3317 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3318 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3320 out_invalid_cdb_field:
3321 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3322 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3327 * Called from I/O completion to determine which dormant/delayed
3328 * and ordered cmds need to have their tasks added to the execution queue.
3330 static void transport_complete_task_attr(struct se_cmd *cmd)
3332 struct se_device *dev = cmd->se_dev;
3333 struct se_cmd *cmd_p, *cmd_tmp;
3334 int new_active_tasks = 0;
3336 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3337 atomic_dec(&dev->simple_cmds);
3338 smp_mb__after_atomic_dec();
3339 dev->dev_cur_ordered_id++;
3340 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3341 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3342 cmd->se_ordered_id);
3343 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3344 atomic_dec(&dev->dev_hoq_count);
3345 smp_mb__after_atomic_dec();
3346 dev->dev_cur_ordered_id++;
3347 pr_debug("Incremented dev_cur_ordered_id: %u for"
3348 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3349 cmd->se_ordered_id);
3350 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3351 spin_lock(&dev->ordered_cmd_lock);
3352 list_del(&cmd->se_ordered_node);
3353 atomic_dec(&dev->dev_ordered_sync);
3354 smp_mb__after_atomic_dec();
3355 spin_unlock(&dev->ordered_cmd_lock);
3357 dev->dev_cur_ordered_id++;
3358 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3359 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3362 * Process all commands up to the last received
3363 * ORDERED task attribute which requires another blocking
3366 spin_lock(&dev->delayed_cmd_lock);
3367 list_for_each_entry_safe(cmd_p, cmd_tmp,
3368 &dev->delayed_cmd_list, se_delayed_node) {
3370 list_del(&cmd_p->se_delayed_node);
3371 spin_unlock(&dev->delayed_cmd_lock);
3373 pr_debug("Calling add_tasks() for"
3374 " cmd_p: 0x%02x Task Attr: 0x%02x"
3375 " Dormant -> Active, se_ordered_id: %u\n",
3376 cmd_p->t_task_cdb[0],
3377 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3379 transport_add_tasks_from_cmd(cmd_p);
3382 spin_lock(&dev->delayed_cmd_lock);
3383 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3386 spin_unlock(&dev->delayed_cmd_lock);
3388 * If new tasks have become active, wake up the transport thread
3389 * to do the processing of the Active tasks.
3391 if (new_active_tasks != 0)
3392 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3395 static void transport_complete_qf(struct se_cmd *cmd)
3399 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3400 transport_complete_task_attr(cmd);
3402 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3403 ret = cmd->se_tfo->queue_status(cmd);
3408 switch (cmd->data_direction) {
3409 case DMA_FROM_DEVICE:
3410 ret = cmd->se_tfo->queue_data_in(cmd);
3413 if (cmd->t_bidi_data_sg) {
3414 ret = cmd->se_tfo->queue_data_in(cmd);
3418 /* Fall through for DMA_TO_DEVICE */
3420 ret = cmd->se_tfo->queue_status(cmd);
3428 transport_handle_queue_full(cmd, cmd->se_dev);
3431 transport_lun_remove_cmd(cmd);
3432 transport_cmd_check_stop_to_fabric(cmd);
3435 static void transport_handle_queue_full(
3437 struct se_device *dev)
3439 spin_lock_irq(&dev->qf_cmd_lock);
3440 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3441 atomic_inc(&dev->dev_qf_count);
3442 smp_mb__after_atomic_inc();
3443 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3445 schedule_work(&cmd->se_dev->qf_work_queue);
3448 static void target_complete_ok_work(struct work_struct *work)
3450 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3451 int reason = 0, ret;
3454 * Check if we need to move delayed/dormant tasks from cmds on the
3455 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3458 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3459 transport_complete_task_attr(cmd);
3461 * Check to schedule QUEUE_FULL work, or execute an existing
3462 * cmd->transport_qf_callback()
3464 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3465 schedule_work(&cmd->se_dev->qf_work_queue);
3468 * Check if we need to retrieve a sense buffer from
3469 * the struct se_cmd in question.
3471 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3472 if (transport_get_sense_data(cmd) < 0)
3473 reason = TCM_NON_EXISTENT_LUN;
3476 * Only set when an struct se_task->task_scsi_status returned
3477 * a non GOOD status.
3479 if (cmd->scsi_status) {
3480 ret = transport_send_check_condition_and_sense(
3485 transport_lun_remove_cmd(cmd);
3486 transport_cmd_check_stop_to_fabric(cmd);
3491 * Check for a callback, used by amongst other things
3492 * XDWRITE_READ_10 emulation.
3494 if (cmd->transport_complete_callback)
3495 cmd->transport_complete_callback(cmd);
3497 switch (cmd->data_direction) {
3498 case DMA_FROM_DEVICE:
3499 spin_lock(&cmd->se_lun->lun_sep_lock);
3500 if (cmd->se_lun->lun_sep) {
3501 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3504 spin_unlock(&cmd->se_lun->lun_sep_lock);
3506 ret = cmd->se_tfo->queue_data_in(cmd);
3511 spin_lock(&cmd->se_lun->lun_sep_lock);
3512 if (cmd->se_lun->lun_sep) {
3513 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3516 spin_unlock(&cmd->se_lun->lun_sep_lock);
3518 * Check if we need to send READ payload for BIDI-COMMAND
3520 if (cmd->t_bidi_data_sg) {
3521 spin_lock(&cmd->se_lun->lun_sep_lock);
3522 if (cmd->se_lun->lun_sep) {
3523 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3526 spin_unlock(&cmd->se_lun->lun_sep_lock);
3527 ret = cmd->se_tfo->queue_data_in(cmd);
3532 /* Fall through for DMA_TO_DEVICE */
3534 ret = cmd->se_tfo->queue_status(cmd);
3542 transport_lun_remove_cmd(cmd);
3543 transport_cmd_check_stop_to_fabric(cmd);
3547 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3548 " data_direction: %d\n", cmd, cmd->data_direction);
3549 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3550 transport_handle_queue_full(cmd, cmd->se_dev);
3553 static void transport_free_dev_tasks(struct se_cmd *cmd)
3555 struct se_task *task, *task_tmp;
3556 unsigned long flags;
3557 LIST_HEAD(dispose_list);
3559 spin_lock_irqsave(&cmd->t_state_lock, flags);
3560 list_for_each_entry_safe(task, task_tmp,
3561 &cmd->t_task_list, t_list) {
3562 if (!(task->task_flags & TF_ACTIVE))
3563 list_move_tail(&task->t_list, &dispose_list);
3565 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3567 while (!list_empty(&dispose_list)) {
3568 task = list_first_entry(&dispose_list, struct se_task, t_list);
3571 * We already cancelled all pending timers in
3572 * transport_complete_task, but that was just a pure del_timer,
3573 * so do a full del_timer_sync here to make sure any handler
3574 * that was running at that point has finished execution.
3576 del_timer_sync(&task->task_timer);
3578 kfree(task->task_sg_bidi);
3579 kfree(task->task_sg);
3581 list_del(&task->t_list);
3583 cmd->se_dev->transport->free_task(task);
3587 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3589 struct scatterlist *sg;
3592 for_each_sg(sgl, sg, nents, count)
3593 __free_page(sg_page(sg));
3598 static inline void transport_free_pages(struct se_cmd *cmd)
3600 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3603 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3604 cmd->t_data_sg = NULL;
3605 cmd->t_data_nents = 0;
3607 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3608 cmd->t_bidi_data_sg = NULL;
3609 cmd->t_bidi_data_nents = 0;
3613 * transport_put_cmd - release a reference to a command
3614 * @cmd: command to release
3616 * This routine releases our reference to the command and frees it if possible.
3618 static void transport_put_cmd(struct se_cmd *cmd)
3620 unsigned long flags;
3623 spin_lock_irqsave(&cmd->t_state_lock, flags);
3624 if (atomic_read(&cmd->t_fe_count)) {
3625 if (!atomic_dec_and_test(&cmd->t_fe_count))
3629 if (atomic_read(&cmd->t_se_count)) {
3630 if (!atomic_dec_and_test(&cmd->t_se_count))
3634 if (atomic_read(&cmd->transport_dev_active)) {
3635 atomic_set(&cmd->transport_dev_active, 0);
3636 transport_all_task_dev_remove_state(cmd);
3639 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3641 if (free_tasks != 0)
3642 transport_free_dev_tasks(cmd);
3644 transport_free_pages(cmd);
3645 transport_release_cmd(cmd);
3648 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3652 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3653 * allocating in the core.
3654 * @cmd: Associated se_cmd descriptor
3655 * @mem: SGL style memory for TCM WRITE / READ
3656 * @sg_mem_num: Number of SGL elements
3657 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3658 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3660 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3663 int transport_generic_map_mem_to_cmd(
3665 struct scatterlist *sgl,
3667 struct scatterlist *sgl_bidi,
3670 if (!sgl || !sgl_count)
3673 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3674 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3676 cmd->t_data_sg = sgl;
3677 cmd->t_data_nents = sgl_count;
3679 if (sgl_bidi && sgl_bidi_count) {
3680 cmd->t_bidi_data_sg = sgl_bidi;
3681 cmd->t_bidi_data_nents = sgl_bidi_count;
3683 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3688 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3690 static int transport_new_cmd_obj(struct se_cmd *cmd)
3692 struct se_device *dev = cmd->se_dev;
3693 int set_counts = 1, rc, task_cdbs;
3696 * Setup any BIDI READ tasks and memory from
3697 * cmd->t_mem_bidi_list so the READ struct se_tasks
3698 * are queued first for the non pSCSI passthrough case.
3700 if (cmd->t_bidi_data_sg &&
3701 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3702 rc = transport_allocate_tasks(cmd,
3705 cmd->t_bidi_data_sg,
3706 cmd->t_bidi_data_nents);
3708 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3709 cmd->scsi_sense_reason =
3710 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3713 atomic_inc(&cmd->t_fe_count);
3714 atomic_inc(&cmd->t_se_count);
3718 * Setup the tasks and memory from cmd->t_mem_list
3719 * Note for BIDI transfers this will contain the WRITE payload
3721 task_cdbs = transport_allocate_tasks(cmd,
3723 cmd->data_direction,
3726 if (task_cdbs <= 0) {
3727 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3728 cmd->scsi_sense_reason =
3729 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3734 atomic_inc(&cmd->t_fe_count);
3735 atomic_inc(&cmd->t_se_count);
3738 cmd->t_task_list_num = task_cdbs;
3740 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3741 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3742 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
3746 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3748 struct scatterlist *sg = cmd->t_data_sg;
3752 * We need to take into account a possible offset here for fabrics like
3753 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3754 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3756 return kmap(sg_page(sg)) + sg->offset;
3758 EXPORT_SYMBOL(transport_kmap_first_data_page);
3760 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3762 kunmap(sg_page(cmd->t_data_sg));
3764 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3767 transport_generic_get_mem(struct se_cmd *cmd)
3769 u32 length = cmd->data_length;
3774 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3775 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3776 if (!cmd->t_data_sg)
3779 cmd->t_data_nents = nents;
3780 sg_init_table(cmd->t_data_sg, nents);
3783 u32 page_len = min_t(u32, length, PAGE_SIZE);
3784 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3788 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3796 __free_page(sg_page(&cmd->t_data_sg[i]));
3799 kfree(cmd->t_data_sg);
3800 cmd->t_data_sg = NULL;
3804 /* Reduce sectors if they are too long for the device */
3805 static inline sector_t transport_limit_task_sectors(
3806 struct se_device *dev,
3807 unsigned long long lba,
3810 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3812 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3813 if ((lba + sectors) > transport_dev_end_lba(dev))
3814 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3821 * This function can be used by HW target mode drivers to create a linked
3822 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3823 * This is intended to be called during the completion path by TCM Core
3824 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3826 void transport_do_task_sg_chain(struct se_cmd *cmd)
3828 struct scatterlist *sg_first = NULL;
3829 struct scatterlist *sg_prev = NULL;
3830 int sg_prev_nents = 0;
3831 struct scatterlist *sg;
3832 struct se_task *task;
3833 u32 chained_nents = 0;
3836 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3839 * Walk the struct se_task list and setup scatterlist chains
3840 * for each contiguously allocated struct se_task->task_sg[].
3842 list_for_each_entry(task, &cmd->t_task_list, t_list) {
3847 sg_first = task->task_sg;
3848 chained_nents = task->task_sg_nents;
3850 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3851 chained_nents += task->task_sg_nents;
3854 * For the padded tasks, use the extra SGL vector allocated
3855 * in transport_allocate_data_tasks() for the sg_prev_nents
3856 * offset into sg_chain() above.
3858 * We do not need the padding for the last task (or a single
3859 * task), but in that case we will never use the sg_prev_nents
3860 * value below which would be incorrect.
3862 sg_prev_nents = (task->task_sg_nents + 1);
3863 sg_prev = task->task_sg;
3866 * Setup the starting pointer and total t_tasks_sg_linked_no including
3867 * padding SGs for linking and to mark the end.
3869 cmd->t_tasks_sg_chained = sg_first;
3870 cmd->t_tasks_sg_chained_no = chained_nents;
3872 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3873 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3874 cmd->t_tasks_sg_chained_no);
3876 for_each_sg(cmd->t_tasks_sg_chained, sg,
3877 cmd->t_tasks_sg_chained_no, i) {
3879 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3880 i, sg, sg_page(sg), sg->length, sg->offset);
3881 if (sg_is_chain(sg))
3882 pr_debug("SG: %p sg_is_chain=1\n", sg);
3884 pr_debug("SG: %p sg_is_last=1\n", sg);
3887 EXPORT_SYMBOL(transport_do_task_sg_chain);
3890 * Break up cmd into chunks transport can handle
3892 static int transport_allocate_data_tasks(
3894 unsigned long long lba,
3895 enum dma_data_direction data_direction,
3896 struct scatterlist *sgl,
3897 unsigned int sgl_nents)
3899 struct se_task *task;
3900 struct se_device *dev = cmd->se_dev;
3901 unsigned long flags;
3903 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3904 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3905 struct scatterlist *sg;
3906 struct scatterlist *cmd_sg;
3908 WARN_ON(cmd->data_length % sector_size);
3909 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3910 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3913 for (i = 0; i < task_count; i++) {
3914 unsigned int task_size, task_sg_nents_padded;
3917 task = transport_generic_get_task(cmd, data_direction);
3921 task->task_lba = lba;
3922 task->task_sectors = min(sectors, dev_max_sectors);
3923 task->task_size = task->task_sectors * sector_size;
3926 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3927 * in order to calculate the number per task SGL entries
3929 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3931 * Check if the fabric module driver is requesting that all
3932 * struct se_task->task_sg[] be chained together.. If so,
3933 * then allocate an extra padding SG entry for linking and
3934 * marking the end of the chained SGL for every task except
3935 * the last one for (task_count > 1) operation, or skipping
3936 * the extra padding for the (task_count == 1) case.
3938 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3939 task_sg_nents_padded = (task->task_sg_nents + 1);
3941 task_sg_nents_padded = task->task_sg_nents;
3943 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3944 task_sg_nents_padded, GFP_KERNEL);
3945 if (!task->task_sg) {
3946 cmd->se_dev->transport->free_task(task);
3950 sg_init_table(task->task_sg, task_sg_nents_padded);
3952 task_size = task->task_size;
3954 /* Build new sgl, only up to task_size */
3955 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3956 if (cmd_sg->length > task_size)
3960 task_size -= cmd_sg->length;
3961 cmd_sg = sg_next(cmd_sg);
3964 lba += task->task_sectors;
3965 sectors -= task->task_sectors;
3967 spin_lock_irqsave(&cmd->t_state_lock, flags);
3968 list_add_tail(&task->t_list, &cmd->t_task_list);
3969 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3976 transport_allocate_control_task(struct se_cmd *cmd)
3978 struct se_task *task;
3979 unsigned long flags;
3981 task = transport_generic_get_task(cmd, cmd->data_direction);
3985 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
3987 if (!task->task_sg) {
3988 cmd->se_dev->transport->free_task(task);
3992 memcpy(task->task_sg, cmd->t_data_sg,
3993 sizeof(struct scatterlist) * cmd->t_data_nents);
3994 task->task_size = cmd->data_length;
3995 task->task_sg_nents = cmd->t_data_nents;
3997 spin_lock_irqsave(&cmd->t_state_lock, flags);
3998 list_add_tail(&task->t_list, &cmd->t_task_list);
3999 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4001 /* Success! Return number of tasks allocated */
4005 static u32 transport_allocate_tasks(
4007 unsigned long long lba,
4008 enum dma_data_direction data_direction,
4009 struct scatterlist *sgl,
4010 unsigned int sgl_nents)
4012 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4013 if (transport_cmd_get_valid_sectors(cmd) < 0)
4016 return transport_allocate_data_tasks(cmd, lba, data_direction,
4019 return transport_allocate_control_task(cmd);
4024 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4026 * Allocate storage transport resources from a set of values predefined
4027 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4028 * Any non zero return here is treated as an "out of resource' op here.
4031 * Generate struct se_task(s) and/or their payloads for this CDB.
4033 int transport_generic_new_cmd(struct se_cmd *cmd)
4038 * Determine is the TCM fabric module has already allocated physical
4039 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4042 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4044 ret = transport_generic_get_mem(cmd);
4049 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4050 * control or data CDB types, and perform the map to backend subsystem
4051 * code from SGL memory allocated here by transport_generic_get_mem(), or
4052 * via pre-existing SGL memory setup explictly by fabric module code with
4053 * transport_generic_map_mem_to_cmd().
4055 ret = transport_new_cmd_obj(cmd);
4059 * For WRITEs, let the fabric know its buffer is ready..
4060 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4061 * will be added to the struct se_device execution queue after its WRITE
4062 * data has arrived. (ie: It gets handled by the transport processing
4063 * thread a second time)
4065 if (cmd->data_direction == DMA_TO_DEVICE) {
4066 transport_add_tasks_to_state_queue(cmd);
4067 return transport_generic_write_pending(cmd);
4070 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4071 * to the execution queue.
4073 transport_execute_tasks(cmd);
4076 EXPORT_SYMBOL(transport_generic_new_cmd);
4078 /* transport_generic_process_write():
4082 void transport_generic_process_write(struct se_cmd *cmd)
4084 transport_execute_tasks(cmd);
4086 EXPORT_SYMBOL(transport_generic_process_write);
4088 static void transport_write_pending_qf(struct se_cmd *cmd)
4090 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4091 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4093 transport_handle_queue_full(cmd, cmd->se_dev);
4097 static int transport_generic_write_pending(struct se_cmd *cmd)
4099 unsigned long flags;
4102 spin_lock_irqsave(&cmd->t_state_lock, flags);
4103 cmd->t_state = TRANSPORT_WRITE_PENDING;
4104 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4107 * Clear the se_cmd for WRITE_PENDING status in order to set
4108 * cmd->t_transport_active=0 so that transport_generic_handle_data
4109 * can be called from HW target mode interrupt code. This is safe
4110 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4111 * because the se_cmd->se_lun pointer is not being cleared.
4113 transport_cmd_check_stop(cmd, 1, 0);
4116 * Call the fabric write_pending function here to let the
4117 * frontend know that WRITE buffers are ready.
4119 ret = cmd->se_tfo->write_pending(cmd);
4125 return PYX_TRANSPORT_WRITE_PENDING;
4128 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
4129 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4130 transport_handle_queue_full(cmd, cmd->se_dev);
4135 * transport_release_cmd - free a command
4136 * @cmd: command to free
4138 * This routine unconditionally frees a command, and reference counting
4139 * or list removal must be done in the caller.
4141 void transport_release_cmd(struct se_cmd *cmd)
4143 BUG_ON(!cmd->se_tfo);
4145 if (cmd->se_tmr_req)
4146 core_tmr_release_req(cmd->se_tmr_req);
4147 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4148 kfree(cmd->t_task_cdb);
4149 cmd->se_tfo->release_cmd(cmd);
4151 EXPORT_SYMBOL(transport_release_cmd);
4153 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
4155 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4156 if (wait_for_tasks && cmd->se_tmr_req)
4157 transport_wait_for_tasks(cmd);
4159 transport_release_cmd(cmd);
4162 transport_wait_for_tasks(cmd);
4164 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4167 transport_lun_remove_cmd(cmd);
4169 transport_free_dev_tasks(cmd);
4171 transport_put_cmd(cmd);
4174 EXPORT_SYMBOL(transport_generic_free_cmd);
4176 /* transport_lun_wait_for_tasks():
4178 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4179 * an struct se_lun to be successfully shutdown.
4181 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4183 unsigned long flags;
4186 * If the frontend has already requested this struct se_cmd to
4187 * be stopped, we can safely ignore this struct se_cmd.
4189 spin_lock_irqsave(&cmd->t_state_lock, flags);
4190 if (atomic_read(&cmd->t_transport_stop)) {
4191 atomic_set(&cmd->transport_lun_stop, 0);
4192 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4193 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4194 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4195 transport_cmd_check_stop(cmd, 1, 0);
4198 atomic_set(&cmd->transport_lun_fe_stop, 1);
4199 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4201 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4203 ret = transport_stop_tasks_for_cmd(cmd);
4205 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4206 " %d\n", cmd, cmd->t_task_list_num, ret);
4208 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4209 cmd->se_tfo->get_task_tag(cmd));
4210 wait_for_completion(&cmd->transport_lun_stop_comp);
4211 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4212 cmd->se_tfo->get_task_tag(cmd));
4214 transport_remove_cmd_from_queue(cmd);
4219 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4221 struct se_cmd *cmd = NULL;
4222 unsigned long lun_flags, cmd_flags;
4224 * Do exception processing and return CHECK_CONDITION status to the
4227 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4228 while (!list_empty(&lun->lun_cmd_list)) {
4229 cmd = list_first_entry(&lun->lun_cmd_list,
4230 struct se_cmd, se_lun_node);
4231 list_del(&cmd->se_lun_node);
4233 atomic_set(&cmd->transport_lun_active, 0);
4235 * This will notify iscsi_target_transport.c:
4236 * transport_cmd_check_stop() that a LUN shutdown is in
4237 * progress for the iscsi_cmd_t.
4239 spin_lock(&cmd->t_state_lock);
4240 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4241 "_lun_stop for ITT: 0x%08x\n",
4242 cmd->se_lun->unpacked_lun,
4243 cmd->se_tfo->get_task_tag(cmd));
4244 atomic_set(&cmd->transport_lun_stop, 1);
4245 spin_unlock(&cmd->t_state_lock);
4247 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4250 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4251 cmd->se_tfo->get_task_tag(cmd),
4252 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4256 * If the Storage engine still owns the iscsi_cmd_t, determine
4257 * and/or stop its context.
4259 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4260 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4261 cmd->se_tfo->get_task_tag(cmd));
4263 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4264 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4268 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4269 "_wait_for_tasks(): SUCCESS\n",
4270 cmd->se_lun->unpacked_lun,
4271 cmd->se_tfo->get_task_tag(cmd));
4273 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4274 if (!atomic_read(&cmd->transport_dev_active)) {
4275 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4278 atomic_set(&cmd->transport_dev_active, 0);
4279 transport_all_task_dev_remove_state(cmd);
4280 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4282 transport_free_dev_tasks(cmd);
4284 * The Storage engine stopped this struct se_cmd before it was
4285 * send to the fabric frontend for delivery back to the
4286 * Initiator Node. Return this SCSI CDB back with an
4287 * CHECK_CONDITION status.
4290 transport_send_check_condition_and_sense(cmd,
4291 TCM_NON_EXISTENT_LUN, 0);
4293 * If the fabric frontend is waiting for this iscsi_cmd_t to
4294 * be released, notify the waiting thread now that LU has
4295 * finished accessing it.
4297 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4298 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4299 pr_debug("SE_LUN[%d] - Detected FE stop for"
4300 " struct se_cmd: %p ITT: 0x%08x\n",
4302 cmd, cmd->se_tfo->get_task_tag(cmd));
4304 spin_unlock_irqrestore(&cmd->t_state_lock,
4306 transport_cmd_check_stop(cmd, 1, 0);
4307 complete(&cmd->transport_lun_fe_stop_comp);
4308 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4311 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4312 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4314 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4315 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4317 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4320 static int transport_clear_lun_thread(void *p)
4322 struct se_lun *lun = (struct se_lun *)p;
4324 __transport_clear_lun_from_sessions(lun);
4325 complete(&lun->lun_shutdown_comp);
4330 int transport_clear_lun_from_sessions(struct se_lun *lun)
4332 struct task_struct *kt;
4334 kt = kthread_run(transport_clear_lun_thread, lun,
4335 "tcm_cl_%u", lun->unpacked_lun);
4337 pr_err("Unable to start clear_lun thread\n");
4340 wait_for_completion(&lun->lun_shutdown_comp);
4346 * transport_wait_for_tasks - wait for completion to occur
4347 * @cmd: command to wait
4349 * Called from frontend fabric context to wait for storage engine
4350 * to pause and/or release frontend generated struct se_cmd.
4352 void transport_wait_for_tasks(struct se_cmd *cmd)
4354 unsigned long flags;
4356 spin_lock_irqsave(&cmd->t_state_lock, flags);
4357 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4358 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4362 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4363 * has been set in transport_set_supported_SAM_opcode().
4365 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4366 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4370 * If we are already stopped due to an external event (ie: LUN shutdown)
4371 * sleep until the connection can have the passed struct se_cmd back.
4372 * The cmd->transport_lun_stopped_sem will be upped by
4373 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4374 * has completed its operation on the struct se_cmd.
4376 if (atomic_read(&cmd->transport_lun_stop)) {
4378 pr_debug("wait_for_tasks: Stopping"
4379 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4380 "_stop_comp); for ITT: 0x%08x\n",
4381 cmd->se_tfo->get_task_tag(cmd));
4383 * There is a special case for WRITES where a FE exception +
4384 * LUN shutdown means ConfigFS context is still sleeping on
4385 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4386 * We go ahead and up transport_lun_stop_comp just to be sure
4389 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4390 complete(&cmd->transport_lun_stop_comp);
4391 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4392 spin_lock_irqsave(&cmd->t_state_lock, flags);
4394 transport_all_task_dev_remove_state(cmd);
4396 * At this point, the frontend who was the originator of this
4397 * struct se_cmd, now owns the structure and can be released through
4398 * normal means below.
4400 pr_debug("wait_for_tasks: Stopped"
4401 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4402 "stop_comp); for ITT: 0x%08x\n",
4403 cmd->se_tfo->get_task_tag(cmd));
4405 atomic_set(&cmd->transport_lun_stop, 0);
4407 if (!atomic_read(&cmd->t_transport_active) ||
4408 atomic_read(&cmd->t_transport_aborted)) {
4409 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4413 atomic_set(&cmd->t_transport_stop, 1);
4415 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4416 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4417 cmd, cmd->se_tfo->get_task_tag(cmd),
4418 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4420 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4422 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4424 wait_for_completion(&cmd->t_transport_stop_comp);
4426 spin_lock_irqsave(&cmd->t_state_lock, flags);
4427 atomic_set(&cmd->t_transport_active, 0);
4428 atomic_set(&cmd->t_transport_stop, 0);
4430 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4431 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4432 cmd->se_tfo->get_task_tag(cmd));
4434 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4436 EXPORT_SYMBOL(transport_wait_for_tasks);
4438 static int transport_get_sense_codes(
4443 *asc = cmd->scsi_asc;
4444 *ascq = cmd->scsi_ascq;
4449 static int transport_set_sense_codes(
4454 cmd->scsi_asc = asc;
4455 cmd->scsi_ascq = ascq;
4460 int transport_send_check_condition_and_sense(
4465 unsigned char *buffer = cmd->sense_buffer;
4466 unsigned long flags;
4468 u8 asc = 0, ascq = 0;
4470 spin_lock_irqsave(&cmd->t_state_lock, flags);
4471 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4472 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4475 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4476 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4478 if (!reason && from_transport)
4481 if (!from_transport)
4482 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4484 * Data Segment and SenseLength of the fabric response PDU.
4486 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4487 * from include/scsi/scsi_cmnd.h
4489 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4490 TRANSPORT_SENSE_BUFFER);
4492 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4493 * SENSE KEY values from include/scsi/scsi.h
4496 case TCM_NON_EXISTENT_LUN:
4498 buffer[offset] = 0x70;
4499 /* ILLEGAL REQUEST */
4500 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4501 /* LOGICAL UNIT NOT SUPPORTED */
4502 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4504 case TCM_UNSUPPORTED_SCSI_OPCODE:
4505 case TCM_SECTOR_COUNT_TOO_MANY:
4507 buffer[offset] = 0x70;
4508 /* ILLEGAL REQUEST */
4509 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4510 /* INVALID COMMAND OPERATION CODE */
4511 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4513 case TCM_UNKNOWN_MODE_PAGE:
4515 buffer[offset] = 0x70;
4516 /* ILLEGAL REQUEST */
4517 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4518 /* INVALID FIELD IN CDB */
4519 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4521 case TCM_CHECK_CONDITION_ABORT_CMD:
4523 buffer[offset] = 0x70;
4524 /* ABORTED COMMAND */
4525 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4526 /* BUS DEVICE RESET FUNCTION OCCURRED */
4527 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4528 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4530 case TCM_INCORRECT_AMOUNT_OF_DATA:
4532 buffer[offset] = 0x70;
4533 /* ABORTED COMMAND */
4534 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4536 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4537 /* NOT ENOUGH UNSOLICITED DATA */
4538 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4540 case TCM_INVALID_CDB_FIELD:
4542 buffer[offset] = 0x70;
4543 /* ABORTED COMMAND */
4544 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4545 /* INVALID FIELD IN CDB */
4546 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4548 case TCM_INVALID_PARAMETER_LIST:
4550 buffer[offset] = 0x70;
4551 /* ABORTED COMMAND */
4552 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4553 /* INVALID FIELD IN PARAMETER LIST */
4554 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4556 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4558 buffer[offset] = 0x70;
4559 /* ABORTED COMMAND */
4560 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4562 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4563 /* UNEXPECTED_UNSOLICITED_DATA */
4564 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4566 case TCM_SERVICE_CRC_ERROR:
4568 buffer[offset] = 0x70;
4569 /* ABORTED COMMAND */
4570 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4571 /* PROTOCOL SERVICE CRC ERROR */
4572 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4574 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4576 case TCM_SNACK_REJECTED:
4578 buffer[offset] = 0x70;
4579 /* ABORTED COMMAND */
4580 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4582 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4583 /* FAILED RETRANSMISSION REQUEST */
4584 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4586 case TCM_WRITE_PROTECTED:
4588 buffer[offset] = 0x70;
4590 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4591 /* WRITE PROTECTED */
4592 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4594 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4596 buffer[offset] = 0x70;
4597 /* UNIT ATTENTION */
4598 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4599 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4600 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4601 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4603 case TCM_CHECK_CONDITION_NOT_READY:
4605 buffer[offset] = 0x70;
4607 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4608 transport_get_sense_codes(cmd, &asc, &ascq);
4609 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4610 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4612 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4615 buffer[offset] = 0x70;
4616 /* ILLEGAL REQUEST */
4617 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4618 /* LOGICAL UNIT COMMUNICATION FAILURE */
4619 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4623 * This code uses linux/include/scsi/scsi.h SAM status codes!
4625 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4627 * Automatically padded, this value is encoded in the fabric's
4628 * data_length response PDU containing the SCSI defined sense data.
4630 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4633 return cmd->se_tfo->queue_status(cmd);
4635 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4637 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4641 if (atomic_read(&cmd->t_transport_aborted) != 0) {
4643 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4646 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4647 " status for CDB: 0x%02x ITT: 0x%08x\n",
4649 cmd->se_tfo->get_task_tag(cmd));
4651 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4652 cmd->se_tfo->queue_status(cmd);
4657 EXPORT_SYMBOL(transport_check_aborted_status);
4659 void transport_send_task_abort(struct se_cmd *cmd)
4661 unsigned long flags;
4663 spin_lock_irqsave(&cmd->t_state_lock, flags);
4664 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4665 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4668 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4671 * If there are still expected incoming fabric WRITEs, we wait
4672 * until until they have completed before sending a TASK_ABORTED
4673 * response. This response with TASK_ABORTED status will be
4674 * queued back to fabric module by transport_check_aborted_status().
4676 if (cmd->data_direction == DMA_TO_DEVICE) {
4677 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4678 atomic_inc(&cmd->t_transport_aborted);
4679 smp_mb__after_atomic_inc();
4680 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4681 transport_new_cmd_failure(cmd);
4685 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4687 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4688 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4689 cmd->se_tfo->get_task_tag(cmd));
4691 cmd->se_tfo->queue_status(cmd);
4694 /* transport_generic_do_tmr():
4698 int transport_generic_do_tmr(struct se_cmd *cmd)
4700 struct se_device *dev = cmd->se_dev;
4701 struct se_tmr_req *tmr = cmd->se_tmr_req;
4704 switch (tmr->function) {
4705 case TMR_ABORT_TASK:
4706 tmr->response = TMR_FUNCTION_REJECTED;
4708 case TMR_ABORT_TASK_SET:
4710 case TMR_CLEAR_TASK_SET:
4711 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4714 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4715 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4716 TMR_FUNCTION_REJECTED;
4718 case TMR_TARGET_WARM_RESET:
4719 tmr->response = TMR_FUNCTION_REJECTED;
4721 case TMR_TARGET_COLD_RESET:
4722 tmr->response = TMR_FUNCTION_REJECTED;
4725 pr_err("Uknown TMR function: 0x%02x.\n",
4727 tmr->response = TMR_FUNCTION_REJECTED;
4731 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4732 cmd->se_tfo->queue_tm_rsp(cmd);
4734 transport_cmd_check_stop_to_fabric(cmd);
4738 /* transport_processing_thread():
4742 static int transport_processing_thread(void *param)
4746 struct se_device *dev = (struct se_device *) param;
4748 set_user_nice(current, -20);
4750 while (!kthread_should_stop()) {
4751 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4752 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4753 kthread_should_stop());
4758 __transport_execute_tasks(dev);
4760 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4764 switch (cmd->t_state) {
4765 case TRANSPORT_NEW_CMD:
4768 case TRANSPORT_NEW_CMD_MAP:
4769 if (!cmd->se_tfo->new_cmd_map) {
4770 pr_err("cmd->se_tfo->new_cmd_map is"
4771 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4774 ret = cmd->se_tfo->new_cmd_map(cmd);
4776 cmd->transport_error_status = ret;
4777 transport_generic_request_failure(cmd,
4778 0, (cmd->data_direction !=
4782 ret = transport_generic_new_cmd(cmd);
4786 cmd->transport_error_status = ret;
4787 transport_generic_request_failure(cmd,
4788 0, (cmd->data_direction !=
4792 case TRANSPORT_PROCESS_WRITE:
4793 transport_generic_process_write(cmd);
4795 case TRANSPORT_FREE_CMD_INTR:
4796 transport_generic_free_cmd(cmd, 0);
4798 case TRANSPORT_PROCESS_TMR:
4799 transport_generic_do_tmr(cmd);
4801 case TRANSPORT_COMPLETE_QF_WP:
4802 transport_write_pending_qf(cmd);
4804 case TRANSPORT_COMPLETE_QF_OK:
4805 transport_complete_qf(cmd);
4808 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4809 "i_state: %d on SE LUN: %u\n",
4811 cmd->se_tfo->get_task_tag(cmd),
4812 cmd->se_tfo->get_cmd_state(cmd),
4813 cmd->se_lun->unpacked_lun);
4821 WARN_ON(!list_empty(&dev->state_task_list));
4822 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4823 dev->process_thread = NULL;