1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
38 #include <linux/cdrom.h>
39 #include <asm/unaligned.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_tcq.h>
46 #include <target/target_core_base.h>
47 #include <target/target_core_device.h>
48 #include <target/target_core_tmr.h>
49 #include <target/target_core_tpg.h>
50 #include <target/target_core_transport.h>
51 #include <target/target_core_fabric_ops.h>
52 #include <target/target_core_configfs.h>
54 #include "target_core_alua.h"
55 #include "target_core_hba.h"
56 #include "target_core_pr.h"
57 #include "target_core_ua.h"
59 static int sub_api_initialized;
61 static struct kmem_cache *se_cmd_cache;
62 static struct kmem_cache *se_sess_cache;
63 struct kmem_cache *se_tmr_req_cache;
64 struct kmem_cache *se_ua_cache;
65 struct kmem_cache *t10_pr_reg_cache;
66 struct kmem_cache *t10_alua_lu_gp_cache;
67 struct kmem_cache *t10_alua_lu_gp_mem_cache;
68 struct kmem_cache *t10_alua_tg_pt_gp_cache;
69 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71 static int transport_generic_write_pending(struct se_cmd *);
72 static int transport_processing_thread(void *param);
73 static int __transport_execute_tasks(struct se_device *dev);
74 static void transport_complete_task_attr(struct se_cmd *cmd);
75 static void transport_handle_queue_full(struct se_cmd *cmd,
76 struct se_device *dev);
77 static void transport_direct_request_timeout(struct se_cmd *cmd);
78 static void transport_free_dev_tasks(struct se_cmd *cmd);
79 static u32 transport_allocate_tasks(struct se_cmd *cmd,
80 unsigned long long starting_lba,
81 enum dma_data_direction data_direction,
82 struct scatterlist *sgl, unsigned int nents);
83 static int transport_generic_get_mem(struct se_cmd *cmd);
84 static void transport_put_cmd(struct se_cmd *cmd);
85 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
86 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
87 static void transport_stop_all_task_timers(struct se_cmd *cmd);
89 int init_se_kmem_caches(void)
91 se_cmd_cache = kmem_cache_create("se_cmd_cache",
92 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
94 pr_err("kmem_cache_create for struct se_cmd failed\n");
97 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
98 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
100 if (!se_tmr_req_cache) {
101 pr_err("kmem_cache_create() for struct se_tmr_req"
105 se_sess_cache = kmem_cache_create("se_sess_cache",
106 sizeof(struct se_session), __alignof__(struct se_session),
108 if (!se_sess_cache) {
109 pr_err("kmem_cache_create() for struct se_session"
113 se_ua_cache = kmem_cache_create("se_ua_cache",
114 sizeof(struct se_ua), __alignof__(struct se_ua),
117 pr_err("kmem_cache_create() for struct se_ua failed\n");
120 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
121 sizeof(struct t10_pr_registration),
122 __alignof__(struct t10_pr_registration), 0, NULL);
123 if (!t10_pr_reg_cache) {
124 pr_err("kmem_cache_create() for struct t10_pr_registration"
128 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
129 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
131 if (!t10_alua_lu_gp_cache) {
132 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
136 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
137 sizeof(struct t10_alua_lu_gp_member),
138 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
139 if (!t10_alua_lu_gp_mem_cache) {
140 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
144 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
145 sizeof(struct t10_alua_tg_pt_gp),
146 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
147 if (!t10_alua_tg_pt_gp_cache) {
148 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
152 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
153 "t10_alua_tg_pt_gp_mem_cache",
154 sizeof(struct t10_alua_tg_pt_gp_member),
155 __alignof__(struct t10_alua_tg_pt_gp_member),
157 if (!t10_alua_tg_pt_gp_mem_cache) {
158 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
166 kmem_cache_destroy(se_cmd_cache);
167 if (se_tmr_req_cache)
168 kmem_cache_destroy(se_tmr_req_cache);
170 kmem_cache_destroy(se_sess_cache);
172 kmem_cache_destroy(se_ua_cache);
173 if (t10_pr_reg_cache)
174 kmem_cache_destroy(t10_pr_reg_cache);
175 if (t10_alua_lu_gp_cache)
176 kmem_cache_destroy(t10_alua_lu_gp_cache);
177 if (t10_alua_lu_gp_mem_cache)
178 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
179 if (t10_alua_tg_pt_gp_cache)
180 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
181 if (t10_alua_tg_pt_gp_mem_cache)
182 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
186 void release_se_kmem_caches(void)
188 kmem_cache_destroy(se_cmd_cache);
189 kmem_cache_destroy(se_tmr_req_cache);
190 kmem_cache_destroy(se_sess_cache);
191 kmem_cache_destroy(se_ua_cache);
192 kmem_cache_destroy(t10_pr_reg_cache);
193 kmem_cache_destroy(t10_alua_lu_gp_cache);
194 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
195 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
196 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
199 /* This code ensures unique mib indexes are handed out. */
200 static DEFINE_SPINLOCK(scsi_mib_index_lock);
201 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
204 * Allocate a new row index for the entry type specified
206 u32 scsi_get_new_index(scsi_index_t type)
210 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
212 spin_lock(&scsi_mib_index_lock);
213 new_index = ++scsi_mib_index[type];
214 spin_unlock(&scsi_mib_index_lock);
219 void transport_init_queue_obj(struct se_queue_obj *qobj)
221 atomic_set(&qobj->queue_cnt, 0);
222 INIT_LIST_HEAD(&qobj->qobj_list);
223 init_waitqueue_head(&qobj->thread_wq);
224 spin_lock_init(&qobj->cmd_queue_lock);
226 EXPORT_SYMBOL(transport_init_queue_obj);
228 static int transport_subsystem_reqmods(void)
232 ret = request_module("target_core_iblock");
234 pr_err("Unable to load target_core_iblock\n");
236 ret = request_module("target_core_file");
238 pr_err("Unable to load target_core_file\n");
240 ret = request_module("target_core_pscsi");
242 pr_err("Unable to load target_core_pscsi\n");
244 ret = request_module("target_core_stgt");
246 pr_err("Unable to load target_core_stgt\n");
251 int transport_subsystem_check_init(void)
255 if (sub_api_initialized)
258 * Request the loading of known TCM subsystem plugins..
260 ret = transport_subsystem_reqmods();
264 sub_api_initialized = 1;
268 struct se_session *transport_init_session(void)
270 struct se_session *se_sess;
272 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
274 pr_err("Unable to allocate struct se_session from"
276 return ERR_PTR(-ENOMEM);
278 INIT_LIST_HEAD(&se_sess->sess_list);
279 INIT_LIST_HEAD(&se_sess->sess_acl_list);
283 EXPORT_SYMBOL(transport_init_session);
286 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
288 void __transport_register_session(
289 struct se_portal_group *se_tpg,
290 struct se_node_acl *se_nacl,
291 struct se_session *se_sess,
292 void *fabric_sess_ptr)
294 unsigned char buf[PR_REG_ISID_LEN];
296 se_sess->se_tpg = se_tpg;
297 se_sess->fabric_sess_ptr = fabric_sess_ptr;
299 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
301 * Only set for struct se_session's that will actually be moving I/O.
302 * eg: *NOT* discovery sessions.
306 * If the fabric module supports an ISID based TransportID,
307 * save this value in binary from the fabric I_T Nexus now.
309 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
310 memset(&buf[0], 0, PR_REG_ISID_LEN);
311 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
312 &buf[0], PR_REG_ISID_LEN);
313 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
315 spin_lock_irq(&se_nacl->nacl_sess_lock);
317 * The se_nacl->nacl_sess pointer will be set to the
318 * last active I_T Nexus for each struct se_node_acl.
320 se_nacl->nacl_sess = se_sess;
322 list_add_tail(&se_sess->sess_acl_list,
323 &se_nacl->acl_sess_list);
324 spin_unlock_irq(&se_nacl->nacl_sess_lock);
326 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
328 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
329 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
331 EXPORT_SYMBOL(__transport_register_session);
333 void transport_register_session(
334 struct se_portal_group *se_tpg,
335 struct se_node_acl *se_nacl,
336 struct se_session *se_sess,
337 void *fabric_sess_ptr)
339 spin_lock_bh(&se_tpg->session_lock);
340 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
341 spin_unlock_bh(&se_tpg->session_lock);
343 EXPORT_SYMBOL(transport_register_session);
345 void transport_deregister_session_configfs(struct se_session *se_sess)
347 struct se_node_acl *se_nacl;
350 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
352 se_nacl = se_sess->se_node_acl;
354 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
355 list_del(&se_sess->sess_acl_list);
357 * If the session list is empty, then clear the pointer.
358 * Otherwise, set the struct se_session pointer from the tail
359 * element of the per struct se_node_acl active session list.
361 if (list_empty(&se_nacl->acl_sess_list))
362 se_nacl->nacl_sess = NULL;
364 se_nacl->nacl_sess = container_of(
365 se_nacl->acl_sess_list.prev,
366 struct se_session, sess_acl_list);
368 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
371 EXPORT_SYMBOL(transport_deregister_session_configfs);
373 void transport_free_session(struct se_session *se_sess)
375 kmem_cache_free(se_sess_cache, se_sess);
377 EXPORT_SYMBOL(transport_free_session);
379 void transport_deregister_session(struct se_session *se_sess)
381 struct se_portal_group *se_tpg = se_sess->se_tpg;
382 struct se_node_acl *se_nacl;
386 transport_free_session(se_sess);
390 spin_lock_irqsave(&se_tpg->session_lock, flags);
391 list_del(&se_sess->sess_list);
392 se_sess->se_tpg = NULL;
393 se_sess->fabric_sess_ptr = NULL;
394 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
397 * Determine if we need to do extra work for this initiator node's
398 * struct se_node_acl if it had been previously dynamically generated.
400 se_nacl = se_sess->se_node_acl;
402 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
403 if (se_nacl->dynamic_node_acl) {
404 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
406 list_del(&se_nacl->acl_list);
407 se_tpg->num_node_acls--;
408 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
410 core_tpg_wait_for_nacl_pr_ref(se_nacl);
411 core_free_device_list_for_node(se_nacl, se_tpg);
412 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
414 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
417 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
420 transport_free_session(se_sess);
422 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
423 se_tpg->se_tpg_tfo->get_fabric_name());
425 EXPORT_SYMBOL(transport_deregister_session);
428 * Called with cmd->t_state_lock held.
430 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
432 struct se_device *dev = cmd->se_dev;
433 struct se_task *task;
439 list_for_each_entry(task, &cmd->t_task_list, t_list) {
440 if (task->task_flags & TF_ACTIVE)
443 if (!atomic_read(&task->task_state_active))
446 spin_lock_irqsave(&dev->execute_task_lock, flags);
447 list_del(&task->t_state_list);
448 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
449 cmd->se_tfo->get_task_tag(cmd), dev, task);
450 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
452 atomic_set(&task->task_state_active, 0);
453 atomic_dec(&cmd->t_task_cdbs_ex_left);
457 /* transport_cmd_check_stop():
459 * 'transport_off = 1' determines if t_transport_active should be cleared.
460 * 'transport_off = 2' determines if task_dev_state should be removed.
462 * A non-zero u8 t_state sets cmd->t_state.
463 * Returns 1 when command is stopped, else 0.
465 static int transport_cmd_check_stop(
472 spin_lock_irqsave(&cmd->t_state_lock, flags);
474 * Determine if IOCTL context caller in requesting the stopping of this
475 * command for LUN shutdown purposes.
477 if (atomic_read(&cmd->transport_lun_stop)) {
478 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
479 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
480 cmd->se_tfo->get_task_tag(cmd));
482 cmd->deferred_t_state = cmd->t_state;
483 cmd->t_state = TRANSPORT_DEFERRED_CMD;
484 atomic_set(&cmd->t_transport_active, 0);
485 if (transport_off == 2)
486 transport_all_task_dev_remove_state(cmd);
487 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
489 complete(&cmd->transport_lun_stop_comp);
493 * Determine if frontend context caller is requesting the stopping of
494 * this command for frontend exceptions.
496 if (atomic_read(&cmd->t_transport_stop)) {
497 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
498 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
499 cmd->se_tfo->get_task_tag(cmd));
501 cmd->deferred_t_state = cmd->t_state;
502 cmd->t_state = TRANSPORT_DEFERRED_CMD;
503 if (transport_off == 2)
504 transport_all_task_dev_remove_state(cmd);
507 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
510 if (transport_off == 2)
512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
514 complete(&cmd->t_transport_stop_comp);
518 atomic_set(&cmd->t_transport_active, 0);
519 if (transport_off == 2) {
520 transport_all_task_dev_remove_state(cmd);
522 * Clear struct se_cmd->se_lun before the transport_off == 2
523 * handoff to fabric module.
527 * Some fabric modules like tcm_loop can release
528 * their internally allocated I/O reference now and
531 if (cmd->se_tfo->check_stop_free != NULL) {
532 spin_unlock_irqrestore(
533 &cmd->t_state_lock, flags);
535 cmd->se_tfo->check_stop_free(cmd);
539 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
543 cmd->t_state = t_state;
544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
549 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
551 return transport_cmd_check_stop(cmd, 2, 0);
554 static void transport_lun_remove_cmd(struct se_cmd *cmd)
556 struct se_lun *lun = cmd->se_lun;
562 spin_lock_irqsave(&cmd->t_state_lock, flags);
563 if (!atomic_read(&cmd->transport_dev_active)) {
564 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
567 atomic_set(&cmd->transport_dev_active, 0);
568 transport_all_task_dev_remove_state(cmd);
569 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
573 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
574 if (atomic_read(&cmd->transport_lun_active)) {
575 list_del(&cmd->se_lun_node);
576 atomic_set(&cmd->transport_lun_active, 0);
578 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
579 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
582 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
585 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
587 if (!cmd->se_tmr_req)
588 transport_lun_remove_cmd(cmd);
590 if (transport_cmd_check_stop_to_fabric(cmd))
593 transport_remove_cmd_from_queue(cmd);
594 transport_put_cmd(cmd);
598 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
601 struct se_device *dev = cmd->se_dev;
602 struct se_queue_obj *qobj = &dev->dev_queue_obj;
606 spin_lock_irqsave(&cmd->t_state_lock, flags);
607 cmd->t_state = t_state;
608 atomic_set(&cmd->t_transport_active, 1);
609 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
612 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
614 /* If the cmd is already on the list, remove it before we add it */
615 if (!list_empty(&cmd->se_queue_node))
616 list_del(&cmd->se_queue_node);
618 atomic_inc(&qobj->queue_cnt);
621 list_add(&cmd->se_queue_node, &qobj->qobj_list);
623 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
624 atomic_set(&cmd->t_transport_queue_active, 1);
625 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
627 wake_up_interruptible(&qobj->thread_wq);
630 static struct se_cmd *
631 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
636 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
637 if (list_empty(&qobj->qobj_list)) {
638 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
641 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
643 atomic_set(&cmd->t_transport_queue_active, 0);
645 list_del_init(&cmd->se_queue_node);
646 atomic_dec(&qobj->queue_cnt);
647 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
652 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
654 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
657 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
658 if (!atomic_read(&cmd->t_transport_queue_active)) {
659 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
662 atomic_set(&cmd->t_transport_queue_active, 0);
663 atomic_dec(&qobj->queue_cnt);
664 list_del_init(&cmd->se_queue_node);
665 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
667 if (atomic_read(&cmd->t_transport_queue_active)) {
668 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
669 cmd->se_tfo->get_task_tag(cmd),
670 atomic_read(&cmd->t_transport_queue_active));
675 * Completion function used by TCM subsystem plugins (such as FILEIO)
676 * for queueing up response from struct se_subsystem_api->do_task()
678 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
680 struct se_task *task = list_entry(cmd->t_task_list.next,
681 struct se_task, t_list);
684 cmd->scsi_status = SAM_STAT_GOOD;
685 task->task_scsi_status = GOOD;
687 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
688 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
689 task->task_se_cmd->transport_error_status =
690 PYX_TRANSPORT_ILLEGAL_REQUEST;
693 transport_complete_task(task, good);
695 EXPORT_SYMBOL(transport_complete_sync_cache);
697 /* transport_complete_task():
699 * Called from interrupt and non interrupt context depending
700 * on the transport plugin.
702 void transport_complete_task(struct se_task *task, int success)
704 struct se_cmd *cmd = task->task_se_cmd;
705 struct se_device *dev = cmd->se_dev;
709 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
710 cmd->t_task_cdb[0], dev);
713 atomic_inc(&dev->depth_left);
715 spin_lock_irqsave(&cmd->t_state_lock, flags);
716 task->task_flags &= ~TF_ACTIVE;
719 * See if any sense data exists, if so set the TASK_SENSE flag.
720 * Also check for any other post completion work that needs to be
721 * done by the plugins.
723 if (dev && dev->transport->transport_complete) {
724 if (dev->transport->transport_complete(task) != 0) {
725 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
726 task->task_sense = 1;
732 * See if we are waiting for outstanding struct se_task
733 * to complete for an exception condition
735 if (task->task_flags & TF_REQUEST_STOP) {
737 * Decrement cmd->t_se_count if this task had
738 * previously thrown its timeout exception handler.
740 if (task->task_flags & TF_TIMEOUT) {
741 atomic_dec(&cmd->t_se_count);
742 task->task_flags &= ~TF_TIMEOUT;
744 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
746 complete(&task->task_stop_comp);
750 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
751 * left counter to determine when the struct se_cmd is ready to be queued to
752 * the processing thread.
754 if (task->task_flags & TF_TIMEOUT) {
755 if (!atomic_dec_and_test(
756 &cmd->t_task_cdbs_timeout_left)) {
757 spin_unlock_irqrestore(&cmd->t_state_lock,
761 t_state = TRANSPORT_COMPLETE_TIMEOUT;
762 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
764 transport_add_cmd_to_queue(cmd, t_state, false);
767 atomic_dec(&cmd->t_task_cdbs_timeout_left);
770 * Decrement the outstanding t_task_cdbs_left count. The last
771 * struct se_task from struct se_cmd will complete itself into the
772 * device queue depending upon int success.
774 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
776 cmd->t_tasks_failed = 1;
778 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
782 if (!success || cmd->t_tasks_failed) {
783 t_state = TRANSPORT_COMPLETE_FAILURE;
784 if (!task->task_error_status) {
785 task->task_error_status =
786 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
787 cmd->transport_error_status =
788 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
791 atomic_set(&cmd->t_transport_complete, 1);
792 t_state = TRANSPORT_COMPLETE_OK;
794 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
796 transport_add_cmd_to_queue(cmd, t_state, false);
798 EXPORT_SYMBOL(transport_complete_task);
801 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
802 * struct se_task list are ready to be added to the active execution list
805 * Called with se_dev_t->execute_task_lock called.
807 static inline int transport_add_task_check_sam_attr(
808 struct se_task *task,
809 struct se_task *task_prev,
810 struct se_device *dev)
813 * No SAM Task attribute emulation enabled, add to tail of
816 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
817 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
821 * HEAD_OF_QUEUE attribute for received CDB, which means
822 * the first task that is associated with a struct se_cmd goes to
823 * head of the struct se_device->execute_task_list, and task_prev
824 * after that for each subsequent task
826 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
827 list_add(&task->t_execute_list,
828 (task_prev != NULL) ?
829 &task_prev->t_execute_list :
830 &dev->execute_task_list);
832 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
833 " in execution queue\n",
834 task->task_se_cmd->t_task_cdb[0]);
838 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
839 * transitioned from Dermant -> Active state, and are added to the end
840 * of the struct se_device->execute_task_list
842 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
846 /* __transport_add_task_to_execute_queue():
848 * Called with se_dev_t->execute_task_lock called.
850 static void __transport_add_task_to_execute_queue(
851 struct se_task *task,
852 struct se_task *task_prev,
853 struct se_device *dev)
857 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
858 atomic_inc(&dev->execute_tasks);
860 if (atomic_read(&task->task_state_active))
863 * Determine if this task needs to go to HEAD_OF_QUEUE for the
864 * state list as well. Running with SAM Task Attribute emulation
865 * will always return head_of_queue == 0 here
868 list_add(&task->t_state_list, (task_prev) ?
869 &task_prev->t_state_list :
870 &dev->state_task_list);
872 list_add_tail(&task->t_state_list, &dev->state_task_list);
874 atomic_set(&task->task_state_active, 1);
876 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
877 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
881 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
883 struct se_device *dev = cmd->se_dev;
884 struct se_task *task;
887 spin_lock_irqsave(&cmd->t_state_lock, flags);
888 list_for_each_entry(task, &cmd->t_task_list, t_list) {
889 if (atomic_read(&task->task_state_active))
892 spin_lock(&dev->execute_task_lock);
893 list_add_tail(&task->t_state_list, &dev->state_task_list);
894 atomic_set(&task->task_state_active, 1);
896 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
897 task->task_se_cmd->se_tfo->get_task_tag(
898 task->task_se_cmd), task, dev);
900 spin_unlock(&dev->execute_task_lock);
902 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
905 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
907 struct se_device *dev = cmd->se_dev;
908 struct se_task *task, *task_prev = NULL;
911 spin_lock_irqsave(&dev->execute_task_lock, flags);
912 list_for_each_entry(task, &cmd->t_task_list, t_list) {
913 if (!list_empty(&task->t_execute_list))
916 * __transport_add_task_to_execute_queue() handles the
917 * SAM Task Attribute emulation if enabled
919 __transport_add_task_to_execute_queue(task, task_prev, dev);
922 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
925 void __transport_remove_task_from_execute_queue(struct se_task *task,
926 struct se_device *dev)
928 list_del_init(&task->t_execute_list);
929 atomic_dec(&dev->execute_tasks);
932 void transport_remove_task_from_execute_queue(
933 struct se_task *task,
934 struct se_device *dev)
938 if (WARN_ON(list_empty(&task->t_execute_list)))
941 spin_lock_irqsave(&dev->execute_task_lock, flags);
942 __transport_remove_task_from_execute_queue(task, dev);
943 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
947 * Handle QUEUE_FULL / -EAGAIN status
950 static void target_qf_do_work(struct work_struct *work)
952 struct se_device *dev = container_of(work, struct se_device,
954 LIST_HEAD(qf_cmd_list);
955 struct se_cmd *cmd, *cmd_tmp;
957 spin_lock_irq(&dev->qf_cmd_lock);
958 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
959 spin_unlock_irq(&dev->qf_cmd_lock);
961 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
962 list_del(&cmd->se_qf_node);
963 atomic_dec(&dev->dev_qf_count);
964 smp_mb__after_atomic_dec();
966 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
967 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
968 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
969 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
972 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
976 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
978 switch (cmd->data_direction) {
981 case DMA_FROM_DEVICE:
985 case DMA_BIDIRECTIONAL:
994 void transport_dump_dev_state(
995 struct se_device *dev,
999 *bl += sprintf(b + *bl, "Status: ");
1000 switch (dev->dev_status) {
1001 case TRANSPORT_DEVICE_ACTIVATED:
1002 *bl += sprintf(b + *bl, "ACTIVATED");
1004 case TRANSPORT_DEVICE_DEACTIVATED:
1005 *bl += sprintf(b + *bl, "DEACTIVATED");
1007 case TRANSPORT_DEVICE_SHUTDOWN:
1008 *bl += sprintf(b + *bl, "SHUTDOWN");
1010 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1011 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1012 *bl += sprintf(b + *bl, "OFFLINE");
1015 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1019 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1020 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1022 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
1023 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1024 *bl += sprintf(b + *bl, " ");
1027 void transport_dump_vpd_proto_id(
1028 struct t10_vpd *vpd,
1029 unsigned char *p_buf,
1032 unsigned char buf[VPD_TMP_BUF_SIZE];
1035 memset(buf, 0, VPD_TMP_BUF_SIZE);
1036 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1038 switch (vpd->protocol_identifier) {
1040 sprintf(buf+len, "Fibre Channel\n");
1043 sprintf(buf+len, "Parallel SCSI\n");
1046 sprintf(buf+len, "SSA\n");
1049 sprintf(buf+len, "IEEE 1394\n");
1052 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1056 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1059 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1062 sprintf(buf+len, "Automation/Drive Interface Transport"
1066 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1069 sprintf(buf+len, "Unknown 0x%02x\n",
1070 vpd->protocol_identifier);
1075 strncpy(p_buf, buf, p_buf_len);
1077 pr_debug("%s", buf);
1081 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1084 * Check if the Protocol Identifier Valid (PIV) bit is set..
1086 * from spc3r23.pdf section 7.5.1
1088 if (page_83[1] & 0x80) {
1089 vpd->protocol_identifier = (page_83[0] & 0xf0);
1090 vpd->protocol_identifier_set = 1;
1091 transport_dump_vpd_proto_id(vpd, NULL, 0);
1094 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1096 int transport_dump_vpd_assoc(
1097 struct t10_vpd *vpd,
1098 unsigned char *p_buf,
1101 unsigned char buf[VPD_TMP_BUF_SIZE];
1105 memset(buf, 0, VPD_TMP_BUF_SIZE);
1106 len = sprintf(buf, "T10 VPD Identifier Association: ");
1108 switch (vpd->association) {
1110 sprintf(buf+len, "addressed logical unit\n");
1113 sprintf(buf+len, "target port\n");
1116 sprintf(buf+len, "SCSI target device\n");
1119 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1125 strncpy(p_buf, buf, p_buf_len);
1127 pr_debug("%s", buf);
1132 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1135 * The VPD identification association..
1137 * from spc3r23.pdf Section 7.6.3.1 Table 297
1139 vpd->association = (page_83[1] & 0x30);
1140 return transport_dump_vpd_assoc(vpd, NULL, 0);
1142 EXPORT_SYMBOL(transport_set_vpd_assoc);
1144 int transport_dump_vpd_ident_type(
1145 struct t10_vpd *vpd,
1146 unsigned char *p_buf,
1149 unsigned char buf[VPD_TMP_BUF_SIZE];
1153 memset(buf, 0, VPD_TMP_BUF_SIZE);
1154 len = sprintf(buf, "T10 VPD Identifier Type: ");
1156 switch (vpd->device_identifier_type) {
1158 sprintf(buf+len, "Vendor specific\n");
1161 sprintf(buf+len, "T10 Vendor ID based\n");
1164 sprintf(buf+len, "EUI-64 based\n");
1167 sprintf(buf+len, "NAA\n");
1170 sprintf(buf+len, "Relative target port identifier\n");
1173 sprintf(buf+len, "SCSI name string\n");
1176 sprintf(buf+len, "Unsupported: 0x%02x\n",
1177 vpd->device_identifier_type);
1183 if (p_buf_len < strlen(buf)+1)
1185 strncpy(p_buf, buf, p_buf_len);
1187 pr_debug("%s", buf);
1193 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1196 * The VPD identifier type..
1198 * from spc3r23.pdf Section 7.6.3.1 Table 298
1200 vpd->device_identifier_type = (page_83[1] & 0x0f);
1201 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1203 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1205 int transport_dump_vpd_ident(
1206 struct t10_vpd *vpd,
1207 unsigned char *p_buf,
1210 unsigned char buf[VPD_TMP_BUF_SIZE];
1213 memset(buf, 0, VPD_TMP_BUF_SIZE);
1215 switch (vpd->device_identifier_code_set) {
1216 case 0x01: /* Binary */
1217 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1218 &vpd->device_identifier[0]);
1220 case 0x02: /* ASCII */
1221 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1222 &vpd->device_identifier[0]);
1224 case 0x03: /* UTF-8 */
1225 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1226 &vpd->device_identifier[0]);
1229 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1230 " 0x%02x", vpd->device_identifier_code_set);
1236 strncpy(p_buf, buf, p_buf_len);
1238 pr_debug("%s", buf);
1244 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1246 static const char hex_str[] = "0123456789abcdef";
1247 int j = 0, i = 4; /* offset to start of the identifer */
1250 * The VPD Code Set (encoding)
1252 * from spc3r23.pdf Section 7.6.3.1 Table 296
1254 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1255 switch (vpd->device_identifier_code_set) {
1256 case 0x01: /* Binary */
1257 vpd->device_identifier[j++] =
1258 hex_str[vpd->device_identifier_type];
1259 while (i < (4 + page_83[3])) {
1260 vpd->device_identifier[j++] =
1261 hex_str[(page_83[i] & 0xf0) >> 4];
1262 vpd->device_identifier[j++] =
1263 hex_str[page_83[i] & 0x0f];
1267 case 0x02: /* ASCII */
1268 case 0x03: /* UTF-8 */
1269 while (i < (4 + page_83[3]))
1270 vpd->device_identifier[j++] = page_83[i++];
1276 return transport_dump_vpd_ident(vpd, NULL, 0);
1278 EXPORT_SYMBOL(transport_set_vpd_ident);
1280 static void core_setup_task_attr_emulation(struct se_device *dev)
1283 * If this device is from Target_Core_Mod/pSCSI, disable the
1284 * SAM Task Attribute emulation.
1286 * This is currently not available in upsream Linux/SCSI Target
1287 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1289 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1290 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1294 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1295 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1296 " device\n", dev->transport->name,
1297 dev->transport->get_device_rev(dev));
1300 static void scsi_dump_inquiry(struct se_device *dev)
1302 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1305 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1307 pr_debug(" Vendor: ");
1308 for (i = 0; i < 8; i++)
1309 if (wwn->vendor[i] >= 0x20)
1310 pr_debug("%c", wwn->vendor[i]);
1314 pr_debug(" Model: ");
1315 for (i = 0; i < 16; i++)
1316 if (wwn->model[i] >= 0x20)
1317 pr_debug("%c", wwn->model[i]);
1321 pr_debug(" Revision: ");
1322 for (i = 0; i < 4; i++)
1323 if (wwn->revision[i] >= 0x20)
1324 pr_debug("%c", wwn->revision[i]);
1330 device_type = dev->transport->get_device_type(dev);
1331 pr_debug(" Type: %s ", scsi_device_type(device_type));
1332 pr_debug(" ANSI SCSI revision: %02x\n",
1333 dev->transport->get_device_rev(dev));
1336 struct se_device *transport_add_device_to_core_hba(
1338 struct se_subsystem_api *transport,
1339 struct se_subsystem_dev *se_dev,
1341 void *transport_dev,
1342 struct se_dev_limits *dev_limits,
1343 const char *inquiry_prod,
1344 const char *inquiry_rev)
1347 struct se_device *dev;
1349 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1351 pr_err("Unable to allocate memory for se_dev_t\n");
1355 transport_init_queue_obj(&dev->dev_queue_obj);
1356 dev->dev_flags = device_flags;
1357 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1358 dev->dev_ptr = transport_dev;
1360 dev->se_sub_dev = se_dev;
1361 dev->transport = transport;
1362 atomic_set(&dev->active_cmds, 0);
1363 INIT_LIST_HEAD(&dev->dev_list);
1364 INIT_LIST_HEAD(&dev->dev_sep_list);
1365 INIT_LIST_HEAD(&dev->dev_tmr_list);
1366 INIT_LIST_HEAD(&dev->execute_task_list);
1367 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1368 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1369 INIT_LIST_HEAD(&dev->state_task_list);
1370 INIT_LIST_HEAD(&dev->qf_cmd_list);
1371 spin_lock_init(&dev->execute_task_lock);
1372 spin_lock_init(&dev->delayed_cmd_lock);
1373 spin_lock_init(&dev->ordered_cmd_lock);
1374 spin_lock_init(&dev->state_task_lock);
1375 spin_lock_init(&dev->dev_alua_lock);
1376 spin_lock_init(&dev->dev_reservation_lock);
1377 spin_lock_init(&dev->dev_status_lock);
1378 spin_lock_init(&dev->dev_status_thr_lock);
1379 spin_lock_init(&dev->se_port_lock);
1380 spin_lock_init(&dev->se_tmr_lock);
1381 spin_lock_init(&dev->qf_cmd_lock);
1383 dev->queue_depth = dev_limits->queue_depth;
1384 atomic_set(&dev->depth_left, dev->queue_depth);
1385 atomic_set(&dev->dev_ordered_id, 0);
1387 se_dev_set_default_attribs(dev, dev_limits);
1389 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1390 dev->creation_time = get_jiffies_64();
1391 spin_lock_init(&dev->stats_lock);
1393 spin_lock(&hba->device_lock);
1394 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1396 spin_unlock(&hba->device_lock);
1398 * Setup the SAM Task Attribute emulation for struct se_device
1400 core_setup_task_attr_emulation(dev);
1402 * Force PR and ALUA passthrough emulation with internal object use.
1404 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1406 * Setup the Reservations infrastructure for struct se_device
1408 core_setup_reservations(dev, force_pt);
1410 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1412 if (core_setup_alua(dev, force_pt) < 0)
1416 * Startup the struct se_device processing thread
1418 dev->process_thread = kthread_run(transport_processing_thread, dev,
1419 "LIO_%s", dev->transport->name);
1420 if (IS_ERR(dev->process_thread)) {
1421 pr_err("Unable to create kthread: LIO_%s\n",
1422 dev->transport->name);
1426 * Setup work_queue for QUEUE_FULL
1428 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1430 * Preload the initial INQUIRY const values if we are doing
1431 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1432 * passthrough because this is being provided by the backend LLD.
1433 * This is required so that transport_get_inquiry() copies these
1434 * originals once back into DEV_T10_WWN(dev) for the virtual device
1437 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1438 if (!inquiry_prod || !inquiry_rev) {
1439 pr_err("All non TCM/pSCSI plugins require"
1440 " INQUIRY consts\n");
1444 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1445 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1446 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1448 scsi_dump_inquiry(dev);
1452 kthread_stop(dev->process_thread);
1454 spin_lock(&hba->device_lock);
1455 list_del(&dev->dev_list);
1457 spin_unlock(&hba->device_lock);
1459 se_release_vpd_for_dev(dev);
1465 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1467 /* transport_generic_prepare_cdb():
1469 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1470 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1471 * The point of this is since we are mapping iSCSI LUNs to
1472 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1473 * devices and HBAs for a loop.
1475 static inline void transport_generic_prepare_cdb(
1479 case READ_10: /* SBC - RDProtect */
1480 case READ_12: /* SBC - RDProtect */
1481 case READ_16: /* SBC - RDProtect */
1482 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1483 case VERIFY: /* SBC - VRProtect */
1484 case VERIFY_16: /* SBC - VRProtect */
1485 case WRITE_VERIFY: /* SBC - VRProtect */
1486 case WRITE_VERIFY_12: /* SBC - VRProtect */
1489 cdb[1] &= 0x1f; /* clear logical unit number */
1494 static struct se_task *
1495 transport_generic_get_task(struct se_cmd *cmd,
1496 enum dma_data_direction data_direction)
1498 struct se_task *task;
1499 struct se_device *dev = cmd->se_dev;
1501 task = dev->transport->alloc_task(cmd->t_task_cdb);
1503 pr_err("Unable to allocate struct se_task\n");
1507 INIT_LIST_HEAD(&task->t_list);
1508 INIT_LIST_HEAD(&task->t_execute_list);
1509 INIT_LIST_HEAD(&task->t_state_list);
1510 init_completion(&task->task_stop_comp);
1511 task->task_se_cmd = cmd;
1512 task->task_data_direction = data_direction;
1517 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1520 * Used by fabric modules containing a local struct se_cmd within their
1521 * fabric dependent per I/O descriptor.
1523 void transport_init_se_cmd(
1525 struct target_core_fabric_ops *tfo,
1526 struct se_session *se_sess,
1530 unsigned char *sense_buffer)
1532 INIT_LIST_HEAD(&cmd->se_lun_node);
1533 INIT_LIST_HEAD(&cmd->se_delayed_node);
1534 INIT_LIST_HEAD(&cmd->se_ordered_node);
1535 INIT_LIST_HEAD(&cmd->se_qf_node);
1536 INIT_LIST_HEAD(&cmd->se_queue_node);
1538 INIT_LIST_HEAD(&cmd->t_task_list);
1539 init_completion(&cmd->transport_lun_fe_stop_comp);
1540 init_completion(&cmd->transport_lun_stop_comp);
1541 init_completion(&cmd->t_transport_stop_comp);
1542 spin_lock_init(&cmd->t_state_lock);
1543 atomic_set(&cmd->transport_dev_active, 1);
1546 cmd->se_sess = se_sess;
1547 cmd->data_length = data_length;
1548 cmd->data_direction = data_direction;
1549 cmd->sam_task_attr = task_attr;
1550 cmd->sense_buffer = sense_buffer;
1552 EXPORT_SYMBOL(transport_init_se_cmd);
1554 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1557 * Check if SAM Task Attribute emulation is enabled for this
1558 * struct se_device storage object
1560 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1563 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1564 pr_debug("SAM Task Attribute ACA"
1565 " emulation is not supported\n");
1569 * Used to determine when ORDERED commands should go from
1570 * Dormant to Active status.
1572 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1573 smp_mb__after_atomic_inc();
1574 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1575 cmd->se_ordered_id, cmd->sam_task_attr,
1576 cmd->se_dev->transport->name);
1580 /* transport_generic_allocate_tasks():
1582 * Called from fabric RX Thread.
1584 int transport_generic_allocate_tasks(
1590 transport_generic_prepare_cdb(cdb);
1592 * Ensure that the received CDB is less than the max (252 + 8) bytes
1593 * for VARIABLE_LENGTH_CMD
1595 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1596 pr_err("Received SCSI CDB with command_size: %d that"
1597 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1598 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1602 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1603 * allocate the additional extended CDB buffer now.. Otherwise
1604 * setup the pointer from __t_task_cdb to t_task_cdb.
1606 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1607 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1609 if (!cmd->t_task_cdb) {
1610 pr_err("Unable to allocate cmd->t_task_cdb"
1611 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1612 scsi_command_size(cdb),
1613 (unsigned long)sizeof(cmd->__t_task_cdb));
1617 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1619 * Copy the original CDB into cmd->
1621 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1623 * Setup the received CDB based on SCSI defined opcodes and
1624 * perform unit attention, persistent reservations and ALUA
1625 * checks for virtual device backends. The cmd->t_task_cdb
1626 * pointer is expected to be setup before we reach this point.
1628 ret = transport_generic_cmd_sequencer(cmd, cdb);
1632 * Check for SAM Task Attribute Emulation
1634 if (transport_check_alloc_task_attr(cmd) < 0) {
1635 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1636 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1639 spin_lock(&cmd->se_lun->lun_sep_lock);
1640 if (cmd->se_lun->lun_sep)
1641 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1642 spin_unlock(&cmd->se_lun->lun_sep_lock);
1645 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1647 static void transport_generic_request_failure(struct se_cmd *,
1648 struct se_device *, int, int);
1650 * Used by fabric module frontends to queue tasks directly.
1651 * Many only be used from process context only
1653 int transport_handle_cdb_direct(
1660 pr_err("cmd->se_lun is NULL\n");
1663 if (in_interrupt()) {
1665 pr_err("transport_generic_handle_cdb cannot be called"
1666 " from interrupt context\n");
1670 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1671 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1672 * in existing usage to ensure that outstanding descriptors are handled
1673 * correctly during shutdown via transport_wait_for_tasks()
1675 * Also, we don't take cmd->t_state_lock here as we only expect
1676 * this to be called for initial descriptor submission.
1678 cmd->t_state = TRANSPORT_NEW_CMD;
1679 atomic_set(&cmd->t_transport_active, 1);
1681 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1682 * so follow TRANSPORT_NEW_CMD processing thread context usage
1683 * and call transport_generic_request_failure() if necessary..
1685 ret = transport_generic_new_cmd(cmd);
1689 cmd->transport_error_status = ret;
1690 transport_generic_request_failure(cmd, NULL, 0,
1691 (cmd->data_direction != DMA_TO_DEVICE));
1695 EXPORT_SYMBOL(transport_handle_cdb_direct);
1698 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1699 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1700 * complete setup in TCM process context w/ TFO->new_cmd_map().
1702 int transport_generic_handle_cdb_map(
1707 pr_err("cmd->se_lun is NULL\n");
1711 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1714 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1716 /* transport_generic_handle_data():
1720 int transport_generic_handle_data(
1724 * For the software fabric case, then we assume the nexus is being
1725 * failed/shutdown when signals are pending from the kthread context
1726 * caller, so we return a failure. For the HW target mode case running
1727 * in interrupt code, the signal_pending() check is skipped.
1729 if (!in_interrupt() && signal_pending(current))
1732 * If the received CDB has aleady been ABORTED by the generic
1733 * target engine, we now call transport_check_aborted_status()
1734 * to queue any delated TASK_ABORTED status for the received CDB to the
1735 * fabric module as we are expecting no further incoming DATA OUT
1736 * sequences at this point.
1738 if (transport_check_aborted_status(cmd, 1) != 0)
1741 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1744 EXPORT_SYMBOL(transport_generic_handle_data);
1746 /* transport_generic_handle_tmr():
1750 int transport_generic_handle_tmr(
1753 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1756 EXPORT_SYMBOL(transport_generic_handle_tmr);
1758 void transport_generic_free_cmd_intr(
1761 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
1763 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1765 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1767 struct se_task *task, *task_tmp;
1768 unsigned long flags;
1771 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1772 cmd->se_tfo->get_task_tag(cmd));
1775 * No tasks remain in the execution queue
1777 spin_lock_irqsave(&cmd->t_state_lock, flags);
1778 list_for_each_entry_safe(task, task_tmp,
1779 &cmd->t_task_list, t_list) {
1780 pr_debug("Processing task %p\n", task);
1782 * If the struct se_task has not been sent and is not active,
1783 * remove the struct se_task from the execution queue.
1785 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1786 spin_unlock_irqrestore(&cmd->t_state_lock,
1788 transport_remove_task_from_execute_queue(task,
1791 pr_debug("Task %p removed from execute queue\n", task);
1792 spin_lock_irqsave(&cmd->t_state_lock, flags);
1797 * If the struct se_task is active, sleep until it is returned
1800 if (task->task_flags & TF_ACTIVE) {
1801 task->task_flags |= TF_REQUEST_STOP;
1802 spin_unlock_irqrestore(&cmd->t_state_lock,
1805 pr_debug("Task %p waiting to complete\n", task);
1806 wait_for_completion(&task->task_stop_comp);
1807 pr_debug("Task %p stopped successfully\n", task);
1809 spin_lock_irqsave(&cmd->t_state_lock, flags);
1810 atomic_dec(&cmd->t_task_cdbs_left);
1811 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1813 pr_debug("Task %p - did nothing\n", task);
1817 __transport_stop_task_timer(task, &flags);
1819 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1825 * Handle SAM-esque emulation for generic transport request failures.
1827 static void transport_generic_request_failure(
1829 struct se_device *dev,
1835 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1836 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1837 cmd->t_task_cdb[0]);
1838 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1839 " %d/%d transport_error_status: %d\n",
1840 cmd->se_tfo->get_cmd_state(cmd),
1841 cmd->t_state, cmd->deferred_t_state,
1842 cmd->transport_error_status);
1843 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1844 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1845 " t_transport_active: %d t_transport_stop: %d"
1846 " t_transport_sent: %d\n", cmd->t_task_list_num,
1847 atomic_read(&cmd->t_task_cdbs_left),
1848 atomic_read(&cmd->t_task_cdbs_sent),
1849 atomic_read(&cmd->t_task_cdbs_ex_left),
1850 atomic_read(&cmd->t_transport_active),
1851 atomic_read(&cmd->t_transport_stop),
1852 atomic_read(&cmd->t_transport_sent));
1854 transport_stop_all_task_timers(cmd);
1857 atomic_inc(&dev->depth_left);
1859 * For SAM Task Attribute emulation for failed struct se_cmd
1861 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1862 transport_complete_task_attr(cmd);
1865 transport_direct_request_timeout(cmd);
1866 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1869 switch (cmd->transport_error_status) {
1870 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1871 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1873 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1874 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1876 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1877 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1879 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1880 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1882 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1884 transport_new_cmd_failure(cmd);
1886 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1887 * we force this session to fall back to session
1890 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1891 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1894 case PYX_TRANSPORT_LU_COMM_FAILURE:
1895 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1896 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1898 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1899 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1901 case PYX_TRANSPORT_WRITE_PROTECTED:
1902 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1904 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1906 * No SENSE Data payload for this case, set SCSI Status
1907 * and queue the response to $FABRIC_MOD.
1909 * Uses linux/include/scsi/scsi.h SAM status codes defs
1911 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1913 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1914 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1917 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1920 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1921 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1922 cmd->orig_fe_lun, 0x2C,
1923 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1925 ret = cmd->se_tfo->queue_status(cmd);
1929 case PYX_TRANSPORT_USE_SENSE_REASON:
1931 * struct se_cmd->scsi_sense_reason already set
1935 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1937 cmd->transport_error_status);
1938 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1942 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1943 * make the call to transport_send_check_condition_and_sense()
1944 * directly. Otherwise expect the fabric to make the call to
1945 * transport_send_check_condition_and_sense() after handling
1946 * possible unsoliticied write data payloads.
1948 if (!sc && !cmd->se_tfo->new_cmd_map)
1949 transport_new_cmd_failure(cmd);
1951 ret = transport_send_check_condition_and_sense(cmd,
1952 cmd->scsi_sense_reason, 0);
1958 transport_lun_remove_cmd(cmd);
1959 if (!transport_cmd_check_stop_to_fabric(cmd))
1964 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1965 transport_handle_queue_full(cmd, cmd->se_dev);
1968 static void transport_direct_request_timeout(struct se_cmd *cmd)
1970 unsigned long flags;
1972 spin_lock_irqsave(&cmd->t_state_lock, flags);
1973 if (!atomic_read(&cmd->t_transport_timeout)) {
1974 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1977 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
1978 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1982 atomic_sub(atomic_read(&cmd->t_transport_timeout),
1984 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1987 static void transport_generic_request_timeout(struct se_cmd *cmd)
1989 unsigned long flags;
1992 * Reset cmd->t_se_count to allow transport_put_cmd()
1993 * to allow last call to free memory resources.
1995 spin_lock_irqsave(&cmd->t_state_lock, flags);
1996 if (atomic_read(&cmd->t_transport_timeout) > 1) {
1997 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
1999 atomic_sub(tmp, &cmd->t_se_count);
2001 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2003 transport_put_cmd(cmd);
2006 static inline u32 transport_lba_21(unsigned char *cdb)
2008 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2011 static inline u32 transport_lba_32(unsigned char *cdb)
2013 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2016 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2018 unsigned int __v1, __v2;
2020 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2021 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2023 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2027 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2029 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2031 unsigned int __v1, __v2;
2033 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2034 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2036 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2039 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2041 unsigned long flags;
2043 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2044 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2045 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2049 * Called from interrupt context.
2051 static void transport_task_timeout_handler(unsigned long data)
2053 struct se_task *task = (struct se_task *)data;
2054 struct se_cmd *cmd = task->task_se_cmd;
2055 unsigned long flags;
2057 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2059 spin_lock_irqsave(&cmd->t_state_lock, flags);
2060 if (task->task_flags & TF_TIMER_STOP) {
2061 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2064 task->task_flags &= ~TF_TIMER_RUNNING;
2067 * Determine if transport_complete_task() has already been called.
2069 if (!(task->task_flags & TF_ACTIVE)) {
2070 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2072 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2076 atomic_inc(&cmd->t_se_count);
2077 atomic_inc(&cmd->t_transport_timeout);
2078 cmd->t_tasks_failed = 1;
2080 task->task_flags |= TF_TIMEOUT;
2081 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2082 task->task_scsi_status = 1;
2084 if (task->task_flags & TF_REQUEST_STOP) {
2085 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2086 " == 1\n", task, cmd);
2087 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2088 complete(&task->task_stop_comp);
2092 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2093 pr_debug("transport task: %p cmd: %p timeout non zero"
2094 " t_task_cdbs_left\n", task, cmd);
2095 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2098 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2101 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
2102 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2104 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE, false);
2108 * Called with cmd->t_state_lock held.
2110 static void transport_start_task_timer(struct se_task *task)
2112 struct se_device *dev = task->task_se_cmd->se_dev;
2115 if (task->task_flags & TF_TIMER_RUNNING)
2118 * If the task_timeout is disabled, exit now.
2120 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
2124 init_timer(&task->task_timer);
2125 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2126 task->task_timer.data = (unsigned long) task;
2127 task->task_timer.function = transport_task_timeout_handler;
2129 task->task_flags |= TF_TIMER_RUNNING;
2130 add_timer(&task->task_timer);
2132 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2133 " %d\n", task->task_se_cmd, task, timeout);
2138 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2140 void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2142 struct se_cmd *cmd = task->task_se_cmd;
2144 if (!(task->task_flags & TF_TIMER_RUNNING))
2147 task->task_flags |= TF_TIMER_STOP;
2148 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
2150 del_timer_sync(&task->task_timer);
2152 spin_lock_irqsave(&cmd->t_state_lock, *flags);
2153 task->task_flags &= ~TF_TIMER_RUNNING;
2154 task->task_flags &= ~TF_TIMER_STOP;
2157 static void transport_stop_all_task_timers(struct se_cmd *cmd)
2159 struct se_task *task = NULL, *task_tmp;
2160 unsigned long flags;
2162 spin_lock_irqsave(&cmd->t_state_lock, flags);
2163 list_for_each_entry_safe(task, task_tmp,
2164 &cmd->t_task_list, t_list)
2165 __transport_stop_task_timer(task, &flags);
2166 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2169 static inline int transport_tcq_window_closed(struct se_device *dev)
2171 if (dev->dev_tcq_window_closed++ <
2172 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2173 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2175 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2177 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2182 * Called from Fabric Module context from transport_execute_tasks()
2184 * The return of this function determins if the tasks from struct se_cmd
2185 * get added to the execution queue in transport_execute_tasks(),
2186 * or are added to the delayed or ordered lists here.
2188 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2190 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2193 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2194 * to allow the passed struct se_cmd list of tasks to the front of the list.
2196 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2197 atomic_inc(&cmd->se_dev->dev_hoq_count);
2198 smp_mb__after_atomic_inc();
2199 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2200 " 0x%02x, se_ordered_id: %u\n",
2202 cmd->se_ordered_id);
2204 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2205 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2206 list_add_tail(&cmd->se_ordered_node,
2207 &cmd->se_dev->ordered_cmd_list);
2208 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2210 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2211 smp_mb__after_atomic_inc();
2213 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2214 " list, se_ordered_id: %u\n",
2216 cmd->se_ordered_id);
2218 * Add ORDERED command to tail of execution queue if
2219 * no other older commands exist that need to be
2222 if (!atomic_read(&cmd->se_dev->simple_cmds))
2226 * For SIMPLE and UNTAGGED Task Attribute commands
2228 atomic_inc(&cmd->se_dev->simple_cmds);
2229 smp_mb__after_atomic_inc();
2232 * Otherwise if one or more outstanding ORDERED task attribute exist,
2233 * add the dormant task(s) built for the passed struct se_cmd to the
2234 * execution queue and become in Active state for this struct se_device.
2236 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2238 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2239 * will be drained upon completion of HEAD_OF_QUEUE task.
2241 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2242 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2243 list_add_tail(&cmd->se_delayed_node,
2244 &cmd->se_dev->delayed_cmd_list);
2245 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2247 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2248 " delayed CMD list, se_ordered_id: %u\n",
2249 cmd->t_task_cdb[0], cmd->sam_task_attr,
2250 cmd->se_ordered_id);
2252 * Return zero to let transport_execute_tasks() know
2253 * not to add the delayed tasks to the execution list.
2258 * Otherwise, no ORDERED task attributes exist..
2264 * Called from fabric module context in transport_generic_new_cmd() and
2265 * transport_generic_process_write()
2267 static int transport_execute_tasks(struct se_cmd *cmd)
2271 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2272 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2273 transport_generic_request_failure(cmd, NULL, 0, 1);
2278 * Call transport_cmd_check_stop() to see if a fabric exception
2279 * has occurred that prevents execution.
2281 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2283 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2284 * attribute for the tasks of the received struct se_cmd CDB
2286 add_tasks = transport_execute_task_attr(cmd);
2290 * This calls transport_add_tasks_from_cmd() to handle
2291 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2292 * (if enabled) in __transport_add_task_to_execute_queue() and
2293 * transport_add_task_check_sam_attr().
2295 transport_add_tasks_from_cmd(cmd);
2298 * Kick the execution queue for the cmd associated struct se_device
2302 __transport_execute_tasks(cmd->se_dev);
2307 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2308 * from struct se_device->execute_task_list and
2310 * Called from transport_processing_thread()
2312 static int __transport_execute_tasks(struct se_device *dev)
2315 struct se_cmd *cmd = NULL;
2316 struct se_task *task = NULL;
2317 unsigned long flags;
2320 * Check if there is enough room in the device and HBA queue to send
2321 * struct se_tasks to the selected transport.
2324 if (!atomic_read(&dev->depth_left))
2325 return transport_tcq_window_closed(dev);
2327 dev->dev_tcq_window_closed = 0;
2329 spin_lock_irq(&dev->execute_task_lock);
2330 if (list_empty(&dev->execute_task_list)) {
2331 spin_unlock_irq(&dev->execute_task_lock);
2334 task = list_first_entry(&dev->execute_task_list,
2335 struct se_task, t_execute_list);
2336 __transport_remove_task_from_execute_queue(task, dev);
2337 spin_unlock_irq(&dev->execute_task_lock);
2339 atomic_dec(&dev->depth_left);
2341 cmd = task->task_se_cmd;
2343 spin_lock_irqsave(&cmd->t_state_lock, flags);
2344 task->task_flags |= (TF_ACTIVE | TF_SENT);
2345 atomic_inc(&cmd->t_task_cdbs_sent);
2347 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2348 cmd->t_task_list_num)
2349 atomic_set(&cmd->transport_sent, 1);
2351 transport_start_task_timer(task);
2352 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2354 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2355 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2356 * struct se_subsystem_api->do_task() caller below.
2358 if (cmd->transport_emulate_cdb) {
2359 error = cmd->transport_emulate_cdb(cmd);
2361 cmd->transport_error_status = error;
2362 spin_lock_irqsave(&cmd->t_state_lock, flags);
2363 task->task_flags &= ~TF_ACTIVE;
2364 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2365 atomic_set(&cmd->transport_sent, 0);
2366 transport_stop_tasks_for_cmd(cmd);
2367 transport_generic_request_failure(cmd, dev, 0, 1);
2371 * Handle the successful completion for transport_emulate_cdb()
2372 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2373 * Otherwise the caller is expected to complete the task with
2376 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2377 cmd->scsi_status = SAM_STAT_GOOD;
2378 task->task_scsi_status = GOOD;
2379 transport_complete_task(task, 1);
2383 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2384 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2385 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2386 * LUN emulation code.
2388 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2389 * call ->do_task() directly and let the underlying TCM subsystem plugin
2390 * code handle the CDB emulation.
2392 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2393 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2394 error = transport_emulate_control_cdb(task);
2396 error = dev->transport->do_task(task);
2399 cmd->transport_error_status = error;
2400 spin_lock_irqsave(&cmd->t_state_lock, flags);
2401 task->task_flags &= ~TF_ACTIVE;
2402 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2403 atomic_set(&cmd->transport_sent, 0);
2404 transport_stop_tasks_for_cmd(cmd);
2405 transport_generic_request_failure(cmd, dev, 0, 1);
2414 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2416 unsigned long flags;
2418 * Any unsolicited data will get dumped for failed command inside of
2421 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2422 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2423 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2424 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2427 static inline u32 transport_get_sectors_6(
2432 struct se_device *dev = cmd->se_dev;
2435 * Assume TYPE_DISK for non struct se_device objects.
2436 * Use 8-bit sector value.
2442 * Use 24-bit allocation length for TYPE_TAPE.
2444 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2445 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2448 * Everything else assume TYPE_DISK Sector CDB location.
2449 * Use 8-bit sector value.
2455 static inline u32 transport_get_sectors_10(
2460 struct se_device *dev = cmd->se_dev;
2463 * Assume TYPE_DISK for non struct se_device objects.
2464 * Use 16-bit sector value.
2470 * XXX_10 is not defined in SSC, throw an exception
2472 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2478 * Everything else assume TYPE_DISK Sector CDB location.
2479 * Use 16-bit sector value.
2482 return (u32)(cdb[7] << 8) + cdb[8];
2485 static inline u32 transport_get_sectors_12(
2490 struct se_device *dev = cmd->se_dev;
2493 * Assume TYPE_DISK for non struct se_device objects.
2494 * Use 32-bit sector value.
2500 * XXX_12 is not defined in SSC, throw an exception
2502 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2508 * Everything else assume TYPE_DISK Sector CDB location.
2509 * Use 32-bit sector value.
2512 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2515 static inline u32 transport_get_sectors_16(
2520 struct se_device *dev = cmd->se_dev;
2523 * Assume TYPE_DISK for non struct se_device objects.
2524 * Use 32-bit sector value.
2530 * Use 24-bit allocation length for TYPE_TAPE.
2532 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2533 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2536 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2537 (cdb[12] << 8) + cdb[13];
2541 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2543 static inline u32 transport_get_sectors_32(
2549 * Assume TYPE_DISK for non struct se_device objects.
2550 * Use 32-bit sector value.
2552 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2553 (cdb[30] << 8) + cdb[31];
2557 static inline u32 transport_get_size(
2562 struct se_device *dev = cmd->se_dev;
2564 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2565 if (cdb[1] & 1) { /* sectors */
2566 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2571 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2572 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2573 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2574 dev->transport->name);
2576 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2579 static void transport_xor_callback(struct se_cmd *cmd)
2581 unsigned char *buf, *addr;
2582 struct scatterlist *sg;
2583 unsigned int offset;
2587 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2589 * 1) read the specified logical block(s);
2590 * 2) transfer logical blocks from the data-out buffer;
2591 * 3) XOR the logical blocks transferred from the data-out buffer with
2592 * the logical blocks read, storing the resulting XOR data in a buffer;
2593 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2594 * blocks transferred from the data-out buffer; and
2595 * 5) transfer the resulting XOR data to the data-in buffer.
2597 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2599 pr_err("Unable to allocate xor_callback buf\n");
2603 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2604 * into the locally allocated *buf
2606 sg_copy_to_buffer(cmd->t_data_sg,
2612 * Now perform the XOR against the BIDI read memory located at
2613 * cmd->t_mem_bidi_list
2617 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2618 addr = kmap_atomic(sg_page(sg), KM_USER0);
2622 for (i = 0; i < sg->length; i++)
2623 *(addr + sg->offset + i) ^= *(buf + offset + i);
2625 offset += sg->length;
2626 kunmap_atomic(addr, KM_USER0);
2634 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2636 static int transport_get_sense_data(struct se_cmd *cmd)
2638 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2639 struct se_device *dev = cmd->se_dev;
2640 struct se_task *task = NULL, *task_tmp;
2641 unsigned long flags;
2644 WARN_ON(!cmd->se_lun);
2649 spin_lock_irqsave(&cmd->t_state_lock, flags);
2650 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2651 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2655 list_for_each_entry_safe(task, task_tmp,
2656 &cmd->t_task_list, t_list) {
2657 if (!task->task_sense)
2660 if (!dev->transport->get_sense_buffer) {
2661 pr_err("dev->transport->get_sense_buffer"
2666 sense_buffer = dev->transport->get_sense_buffer(task);
2667 if (!sense_buffer) {
2668 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2669 " sense buffer for task with sense\n",
2670 cmd->se_tfo->get_task_tag(cmd), task);
2673 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2675 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2676 TRANSPORT_SENSE_BUFFER);
2678 memcpy(&buffer[offset], sense_buffer,
2679 TRANSPORT_SENSE_BUFFER);
2680 cmd->scsi_status = task->task_scsi_status;
2681 /* Automatically padded */
2682 cmd->scsi_sense_length =
2683 (TRANSPORT_SENSE_BUFFER + offset);
2685 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2687 dev->se_hba->hba_id, dev->transport->name,
2691 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2697 transport_handle_reservation_conflict(struct se_cmd *cmd)
2699 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2700 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2701 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2703 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2704 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2707 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2710 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2711 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2712 cmd->orig_fe_lun, 0x2C,
2713 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2717 static inline long long transport_dev_end_lba(struct se_device *dev)
2719 return dev->transport->get_blocks(dev) + 1;
2722 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2724 struct se_device *dev = cmd->se_dev;
2727 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2730 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2732 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2733 pr_err("LBA: %llu Sectors: %u exceeds"
2734 " transport_dev_end_lba(): %llu\n",
2735 cmd->t_task_lba, sectors,
2736 transport_dev_end_lba(dev));
2743 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2746 * Determine if the received WRITE_SAME is used to for direct
2747 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2748 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2749 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2751 int passthrough = (dev->transport->transport_type ==
2752 TRANSPORT_PLUGIN_PHBA_PDEV);
2755 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2756 pr_err("WRITE_SAME PBDATA and LBDATA"
2757 " bits not supported for Block Discard"
2762 * Currently for the emulated case we only accept
2763 * tpws with the UNMAP=1 bit set.
2765 if (!(flags[0] & 0x08)) {
2766 pr_err("WRITE_SAME w/o UNMAP bit not"
2767 " supported for Block Discard Emulation\n");
2775 /* transport_generic_cmd_sequencer():
2777 * Generic Command Sequencer that should work for most DAS transport
2780 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2783 * FIXME: Need to support other SCSI OPCODES where as well.
2785 static int transport_generic_cmd_sequencer(
2789 struct se_device *dev = cmd->se_dev;
2790 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2791 int ret = 0, sector_ret = 0, passthrough;
2792 u32 sectors = 0, size = 0, pr_reg_type = 0;
2796 * Check for an existing UNIT ATTENTION condition
2798 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2799 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2800 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2804 * Check status of Asymmetric Logical Unit Assignment port
2806 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2809 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2810 * The ALUA additional sense code qualifier (ASCQ) is determined
2811 * by the ALUA primary or secondary access state..
2815 pr_debug("[%s]: ALUA TG Port not available,"
2816 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2817 cmd->se_tfo->get_fabric_name(), alua_ascq);
2819 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2820 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2821 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2824 goto out_invalid_cdb_field;
2827 * Check status for SPC-3 Persistent Reservations
2829 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2830 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2831 cmd, cdb, pr_reg_type) != 0)
2832 return transport_handle_reservation_conflict(cmd);
2834 * This means the CDB is allowed for the SCSI Initiator port
2835 * when said port is *NOT* holding the legacy SPC-2 or
2836 * SPC-3 Persistent Reservation.
2842 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2844 goto out_unsupported_cdb;
2845 size = transport_get_size(sectors, cdb, cmd);
2846 cmd->t_task_lba = transport_lba_21(cdb);
2847 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2850 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2852 goto out_unsupported_cdb;
2853 size = transport_get_size(sectors, cdb, cmd);
2854 cmd->t_task_lba = transport_lba_32(cdb);
2855 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2858 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2860 goto out_unsupported_cdb;
2861 size = transport_get_size(sectors, cdb, cmd);
2862 cmd->t_task_lba = transport_lba_32(cdb);
2863 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2866 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2868 goto out_unsupported_cdb;
2869 size = transport_get_size(sectors, cdb, cmd);
2870 cmd->t_task_lba = transport_lba_64(cdb);
2871 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2874 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2876 goto out_unsupported_cdb;
2877 size = transport_get_size(sectors, cdb, cmd);
2878 cmd->t_task_lba = transport_lba_21(cdb);
2879 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2882 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2884 goto out_unsupported_cdb;
2885 size = transport_get_size(sectors, cdb, cmd);
2886 cmd->t_task_lba = transport_lba_32(cdb);
2887 cmd->t_tasks_fua = (cdb[1] & 0x8);
2888 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2891 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2893 goto out_unsupported_cdb;
2894 size = transport_get_size(sectors, cdb, cmd);
2895 cmd->t_task_lba = transport_lba_32(cdb);
2896 cmd->t_tasks_fua = (cdb[1] & 0x8);
2897 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2900 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2902 goto out_unsupported_cdb;
2903 size = transport_get_size(sectors, cdb, cmd);
2904 cmd->t_task_lba = transport_lba_64(cdb);
2905 cmd->t_tasks_fua = (cdb[1] & 0x8);
2906 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2908 case XDWRITEREAD_10:
2909 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2910 !(cmd->t_tasks_bidi))
2911 goto out_invalid_cdb_field;
2912 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2914 goto out_unsupported_cdb;
2915 size = transport_get_size(sectors, cdb, cmd);
2916 cmd->t_task_lba = transport_lba_32(cdb);
2917 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2918 passthrough = (dev->transport->transport_type ==
2919 TRANSPORT_PLUGIN_PHBA_PDEV);
2921 * Skip the remaining assignments for TCM/PSCSI passthrough
2926 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2928 cmd->transport_complete_callback = &transport_xor_callback;
2929 cmd->t_tasks_fua = (cdb[1] & 0x8);
2931 case VARIABLE_LENGTH_CMD:
2932 service_action = get_unaligned_be16(&cdb[8]);
2934 * Determine if this is TCM/PSCSI device and we should disable
2935 * internal emulation for this CDB.
2937 passthrough = (dev->transport->transport_type ==
2938 TRANSPORT_PLUGIN_PHBA_PDEV);
2940 switch (service_action) {
2941 case XDWRITEREAD_32:
2942 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2944 goto out_unsupported_cdb;
2945 size = transport_get_size(sectors, cdb, cmd);
2947 * Use WRITE_32 and READ_32 opcodes for the emulated
2948 * XDWRITE_READ_32 logic.
2950 cmd->t_task_lba = transport_lba_64_ext(cdb);
2951 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2954 * Skip the remaining assignments for TCM/PSCSI passthrough
2960 * Setup BIDI XOR callback to be run during
2961 * transport_generic_complete_ok()
2963 cmd->transport_complete_callback = &transport_xor_callback;
2964 cmd->t_tasks_fua = (cdb[10] & 0x8);
2967 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2969 goto out_unsupported_cdb;
2972 size = transport_get_size(1, cdb, cmd);
2974 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2976 goto out_invalid_cdb_field;
2979 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2980 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2982 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2983 goto out_invalid_cdb_field;
2987 pr_err("VARIABLE_LENGTH_CMD service action"
2988 " 0x%04x not supported\n", service_action);
2989 goto out_unsupported_cdb;
2992 case MAINTENANCE_IN:
2993 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2994 /* MAINTENANCE_IN from SCC-2 */
2996 * Check for emulated MI_REPORT_TARGET_PGS.
2998 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2999 cmd->transport_emulate_cdb =
3000 (su_dev->t10_alua.alua_type ==
3001 SPC3_ALUA_EMULATED) ?
3002 core_emulate_report_target_port_groups :
3005 size = (cdb[6] << 24) | (cdb[7] << 16) |
3006 (cdb[8] << 8) | cdb[9];
3008 /* GPCMD_SEND_KEY from multi media commands */
3009 size = (cdb[8] << 8) + cdb[9];
3011 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3015 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3017 case MODE_SELECT_10:
3018 size = (cdb[7] << 8) + cdb[8];
3019 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3023 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3026 case GPCMD_READ_BUFFER_CAPACITY:
3027 case GPCMD_SEND_OPC:
3030 size = (cdb[7] << 8) + cdb[8];
3031 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3033 case READ_BLOCK_LIMITS:
3034 size = READ_BLOCK_LEN;
3035 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3037 case GPCMD_GET_CONFIGURATION:
3038 case GPCMD_READ_FORMAT_CAPACITIES:
3039 case GPCMD_READ_DISC_INFO:
3040 case GPCMD_READ_TRACK_RZONE_INFO:
3041 size = (cdb[7] << 8) + cdb[8];
3042 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3044 case PERSISTENT_RESERVE_IN:
3045 case PERSISTENT_RESERVE_OUT:
3046 cmd->transport_emulate_cdb =
3047 (su_dev->t10_pr.res_type ==
3048 SPC3_PERSISTENT_RESERVATIONS) ?
3049 core_scsi3_emulate_pr : NULL;
3050 size = (cdb[7] << 8) + cdb[8];
3051 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3053 case GPCMD_MECHANISM_STATUS:
3054 case GPCMD_READ_DVD_STRUCTURE:
3055 size = (cdb[8] << 8) + cdb[9];
3056 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3059 size = READ_POSITION_LEN;
3060 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3062 case MAINTENANCE_OUT:
3063 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3064 /* MAINTENANCE_OUT from SCC-2
3066 * Check for emulated MO_SET_TARGET_PGS.
3068 if (cdb[1] == MO_SET_TARGET_PGS) {
3069 cmd->transport_emulate_cdb =
3070 (su_dev->t10_alua.alua_type ==
3071 SPC3_ALUA_EMULATED) ?
3072 core_emulate_set_target_port_groups :
3076 size = (cdb[6] << 24) | (cdb[7] << 16) |
3077 (cdb[8] << 8) | cdb[9];
3079 /* GPCMD_REPORT_KEY from multi media commands */
3080 size = (cdb[8] << 8) + cdb[9];
3082 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3085 size = (cdb[3] << 8) + cdb[4];
3087 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3088 * See spc4r17 section 5.3
3090 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3091 cmd->sam_task_attr = MSG_HEAD_TAG;
3092 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3095 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3096 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3099 size = READ_CAP_LEN;
3100 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3102 case READ_MEDIA_SERIAL_NUMBER:
3103 case SECURITY_PROTOCOL_IN:
3104 case SECURITY_PROTOCOL_OUT:
3105 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3106 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3108 case SERVICE_ACTION_IN:
3109 case ACCESS_CONTROL_IN:
3110 case ACCESS_CONTROL_OUT:
3112 case READ_ATTRIBUTE:
3113 case RECEIVE_COPY_RESULTS:
3114 case WRITE_ATTRIBUTE:
3115 size = (cdb[10] << 24) | (cdb[11] << 16) |
3116 (cdb[12] << 8) | cdb[13];
3117 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3119 case RECEIVE_DIAGNOSTIC:
3120 case SEND_DIAGNOSTIC:
3121 size = (cdb[3] << 8) | cdb[4];
3122 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3124 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3127 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3128 size = (2336 * sectors);
3129 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3134 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3138 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3140 case READ_ELEMENT_STATUS:
3141 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3142 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3145 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3146 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3151 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3152 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3154 if (cdb[0] == RESERVE_10)
3155 size = (cdb[7] << 8) | cdb[8];
3157 size = cmd->data_length;
3160 * Setup the legacy emulated handler for SPC-2 and
3161 * >= SPC-3 compatible reservation handling (CRH=1)
3162 * Otherwise, we assume the underlying SCSI logic is
3163 * is running in SPC_PASSTHROUGH, and wants reservations
3164 * emulation disabled.
3166 cmd->transport_emulate_cdb =
3167 (su_dev->t10_pr.res_type !=
3169 core_scsi2_emulate_crh : NULL;
3170 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3175 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3176 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3178 if (cdb[0] == RELEASE_10)
3179 size = (cdb[7] << 8) | cdb[8];
3181 size = cmd->data_length;
3183 cmd->transport_emulate_cdb =
3184 (su_dev->t10_pr.res_type !=
3186 core_scsi2_emulate_crh : NULL;
3187 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3189 case SYNCHRONIZE_CACHE:
3190 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3192 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3194 if (cdb[0] == SYNCHRONIZE_CACHE) {
3195 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3196 cmd->t_task_lba = transport_lba_32(cdb);
3198 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3199 cmd->t_task_lba = transport_lba_64(cdb);
3202 goto out_unsupported_cdb;
3204 size = transport_get_size(sectors, cdb, cmd);
3205 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3208 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3210 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3213 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3214 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3216 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3218 * Check to ensure that LBA + Range does not exceed past end of
3219 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3221 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3222 if (transport_cmd_get_valid_sectors(cmd) < 0)
3223 goto out_invalid_cdb_field;
3227 size = get_unaligned_be16(&cdb[7]);
3228 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3231 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3233 goto out_unsupported_cdb;
3236 size = transport_get_size(1, cdb, cmd);
3238 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3239 goto out_invalid_cdb_field;
3242 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3243 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3245 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3246 goto out_invalid_cdb_field;
3249 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3251 goto out_unsupported_cdb;
3254 size = transport_get_size(1, cdb, cmd);
3256 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3257 goto out_invalid_cdb_field;
3260 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3261 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3263 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3264 * of byte 1 bit 3 UNMAP instead of original reserved field
3266 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3267 goto out_invalid_cdb_field;
3269 case ALLOW_MEDIUM_REMOVAL:
3270 case GPCMD_CLOSE_TRACK:
3272 case INITIALIZE_ELEMENT_STATUS:
3273 case GPCMD_LOAD_UNLOAD:
3276 case GPCMD_SET_SPEED:
3279 case TEST_UNIT_READY:
3281 case WRITE_FILEMARKS:
3283 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3286 cmd->transport_emulate_cdb =
3287 transport_core_report_lun_response;
3288 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3290 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3291 * See spc4r17 section 5.3
3293 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3294 cmd->sam_task_attr = MSG_HEAD_TAG;
3295 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3298 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3299 " 0x%02x, sending CHECK_CONDITION.\n",
3300 cmd->se_tfo->get_fabric_name(), cdb[0]);
3301 goto out_unsupported_cdb;
3304 if (size != cmd->data_length) {
3305 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3306 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3307 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3308 cmd->data_length, size, cdb[0]);
3310 cmd->cmd_spdtl = size;
3312 if (cmd->data_direction == DMA_TO_DEVICE) {
3313 pr_err("Rejecting underflow/overflow"
3315 goto out_invalid_cdb_field;
3318 * Reject READ_* or WRITE_* with overflow/underflow for
3319 * type SCF_SCSI_DATA_SG_IO_CDB.
3321 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3322 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3323 " CDB on non 512-byte sector setup subsystem"
3324 " plugin: %s\n", dev->transport->name);
3325 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3326 goto out_invalid_cdb_field;
3329 if (size > cmd->data_length) {
3330 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3331 cmd->residual_count = (size - cmd->data_length);
3333 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3334 cmd->residual_count = (cmd->data_length - size);
3336 cmd->data_length = size;
3339 /* Let's limit control cdbs to a page, for simplicity's sake. */
3340 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3342 goto out_invalid_cdb_field;
3344 transport_set_supported_SAM_opcode(cmd);
3347 out_unsupported_cdb:
3348 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3349 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3351 out_invalid_cdb_field:
3352 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3353 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3358 * Called from transport_generic_complete_ok() and
3359 * transport_generic_request_failure() to determine which dormant/delayed
3360 * and ordered cmds need to have their tasks added to the execution queue.
3362 static void transport_complete_task_attr(struct se_cmd *cmd)
3364 struct se_device *dev = cmd->se_dev;
3365 struct se_cmd *cmd_p, *cmd_tmp;
3366 int new_active_tasks = 0;
3368 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3369 atomic_dec(&dev->simple_cmds);
3370 smp_mb__after_atomic_dec();
3371 dev->dev_cur_ordered_id++;
3372 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3373 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3374 cmd->se_ordered_id);
3375 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3376 atomic_dec(&dev->dev_hoq_count);
3377 smp_mb__after_atomic_dec();
3378 dev->dev_cur_ordered_id++;
3379 pr_debug("Incremented dev_cur_ordered_id: %u for"
3380 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3381 cmd->se_ordered_id);
3382 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3383 spin_lock(&dev->ordered_cmd_lock);
3384 list_del(&cmd->se_ordered_node);
3385 atomic_dec(&dev->dev_ordered_sync);
3386 smp_mb__after_atomic_dec();
3387 spin_unlock(&dev->ordered_cmd_lock);
3389 dev->dev_cur_ordered_id++;
3390 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3391 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3394 * Process all commands up to the last received
3395 * ORDERED task attribute which requires another blocking
3398 spin_lock(&dev->delayed_cmd_lock);
3399 list_for_each_entry_safe(cmd_p, cmd_tmp,
3400 &dev->delayed_cmd_list, se_delayed_node) {
3402 list_del(&cmd_p->se_delayed_node);
3403 spin_unlock(&dev->delayed_cmd_lock);
3405 pr_debug("Calling add_tasks() for"
3406 " cmd_p: 0x%02x Task Attr: 0x%02x"
3407 " Dormant -> Active, se_ordered_id: %u\n",
3408 cmd_p->t_task_cdb[0],
3409 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3411 transport_add_tasks_from_cmd(cmd_p);
3414 spin_lock(&dev->delayed_cmd_lock);
3415 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3418 spin_unlock(&dev->delayed_cmd_lock);
3420 * If new tasks have become active, wake up the transport thread
3421 * to do the processing of the Active tasks.
3423 if (new_active_tasks != 0)
3424 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3427 static void transport_complete_qf(struct se_cmd *cmd)
3431 transport_stop_all_task_timers(cmd);
3432 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3433 transport_complete_task_attr(cmd);
3435 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3436 ret = cmd->se_tfo->queue_status(cmd);
3441 switch (cmd->data_direction) {
3442 case DMA_FROM_DEVICE:
3443 ret = cmd->se_tfo->queue_data_in(cmd);
3446 if (cmd->t_bidi_data_sg) {
3447 ret = cmd->se_tfo->queue_data_in(cmd);
3451 /* Fall through for DMA_TO_DEVICE */
3453 ret = cmd->se_tfo->queue_status(cmd);
3461 transport_handle_queue_full(cmd, cmd->se_dev);
3464 transport_lun_remove_cmd(cmd);
3465 transport_cmd_check_stop_to_fabric(cmd);
3468 static void transport_handle_queue_full(
3470 struct se_device *dev)
3472 spin_lock_irq(&dev->qf_cmd_lock);
3473 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3474 atomic_inc(&dev->dev_qf_count);
3475 smp_mb__after_atomic_inc();
3476 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3478 schedule_work(&cmd->se_dev->qf_work_queue);
3481 static void transport_generic_complete_ok(struct se_cmd *cmd)
3483 int reason = 0, ret;
3485 * Check if we need to move delayed/dormant tasks from cmds on the
3486 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3489 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3490 transport_complete_task_attr(cmd);
3492 * Check to schedule QUEUE_FULL work, or execute an existing
3493 * cmd->transport_qf_callback()
3495 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3496 schedule_work(&cmd->se_dev->qf_work_queue);
3499 * Check if we need to retrieve a sense buffer from
3500 * the struct se_cmd in question.
3502 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3503 if (transport_get_sense_data(cmd) < 0)
3504 reason = TCM_NON_EXISTENT_LUN;
3507 * Only set when an struct se_task->task_scsi_status returned
3508 * a non GOOD status.
3510 if (cmd->scsi_status) {
3511 ret = transport_send_check_condition_and_sense(
3516 transport_lun_remove_cmd(cmd);
3517 transport_cmd_check_stop_to_fabric(cmd);
3522 * Check for a callback, used by amongst other things
3523 * XDWRITE_READ_10 emulation.
3525 if (cmd->transport_complete_callback)
3526 cmd->transport_complete_callback(cmd);
3528 switch (cmd->data_direction) {
3529 case DMA_FROM_DEVICE:
3530 spin_lock(&cmd->se_lun->lun_sep_lock);
3531 if (cmd->se_lun->lun_sep) {
3532 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3535 spin_unlock(&cmd->se_lun->lun_sep_lock);
3537 ret = cmd->se_tfo->queue_data_in(cmd);
3542 spin_lock(&cmd->se_lun->lun_sep_lock);
3543 if (cmd->se_lun->lun_sep) {
3544 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3547 spin_unlock(&cmd->se_lun->lun_sep_lock);
3549 * Check if we need to send READ payload for BIDI-COMMAND
3551 if (cmd->t_bidi_data_sg) {
3552 spin_lock(&cmd->se_lun->lun_sep_lock);
3553 if (cmd->se_lun->lun_sep) {
3554 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3557 spin_unlock(&cmd->se_lun->lun_sep_lock);
3558 ret = cmd->se_tfo->queue_data_in(cmd);
3563 /* Fall through for DMA_TO_DEVICE */
3565 ret = cmd->se_tfo->queue_status(cmd);
3573 transport_lun_remove_cmd(cmd);
3574 transport_cmd_check_stop_to_fabric(cmd);
3578 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3579 " data_direction: %d\n", cmd, cmd->data_direction);
3580 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3581 transport_handle_queue_full(cmd, cmd->se_dev);
3584 static void transport_free_dev_tasks(struct se_cmd *cmd)
3586 struct se_task *task, *task_tmp;
3587 unsigned long flags;
3588 LIST_HEAD(dispose_list);
3590 spin_lock_irqsave(&cmd->t_state_lock, flags);
3591 list_for_each_entry_safe(task, task_tmp,
3592 &cmd->t_task_list, t_list) {
3593 if (!(task->task_flags & TF_ACTIVE))
3594 list_move_tail(&task->t_list, &dispose_list);
3596 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3598 while (!list_empty(&dispose_list)) {
3599 task = list_first_entry(&dispose_list, struct se_task, t_list);
3601 kfree(task->task_sg_bidi);
3602 kfree(task->task_sg);
3604 list_del(&task->t_list);
3606 cmd->se_dev->transport->free_task(task);
3610 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3612 struct scatterlist *sg;
3615 for_each_sg(sgl, sg, nents, count)
3616 __free_page(sg_page(sg));
3621 static inline void transport_free_pages(struct se_cmd *cmd)
3623 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3626 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3627 cmd->t_data_sg = NULL;
3628 cmd->t_data_nents = 0;
3630 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3631 cmd->t_bidi_data_sg = NULL;
3632 cmd->t_bidi_data_nents = 0;
3636 * transport_put_cmd - release a reference to a command
3637 * @cmd: command to release
3639 * This routine releases our reference to the command and frees it if possible.
3641 static void transport_put_cmd(struct se_cmd *cmd)
3643 unsigned long flags;
3646 spin_lock_irqsave(&cmd->t_state_lock, flags);
3647 if (atomic_read(&cmd->t_fe_count)) {
3648 if (!atomic_dec_and_test(&cmd->t_fe_count))
3652 if (atomic_read(&cmd->t_se_count)) {
3653 if (!atomic_dec_and_test(&cmd->t_se_count))
3657 if (atomic_read(&cmd->transport_dev_active)) {
3658 atomic_set(&cmd->transport_dev_active, 0);
3659 transport_all_task_dev_remove_state(cmd);
3662 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3664 if (free_tasks != 0)
3665 transport_free_dev_tasks(cmd);
3667 transport_free_pages(cmd);
3668 transport_release_cmd(cmd);
3671 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3675 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3676 * allocating in the core.
3677 * @cmd: Associated se_cmd descriptor
3678 * @mem: SGL style memory for TCM WRITE / READ
3679 * @sg_mem_num: Number of SGL elements
3680 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3681 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3683 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3686 int transport_generic_map_mem_to_cmd(
3688 struct scatterlist *sgl,
3690 struct scatterlist *sgl_bidi,
3693 if (!sgl || !sgl_count)
3696 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3697 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3699 cmd->t_data_sg = sgl;
3700 cmd->t_data_nents = sgl_count;
3702 if (sgl_bidi && sgl_bidi_count) {
3703 cmd->t_bidi_data_sg = sgl_bidi;
3704 cmd->t_bidi_data_nents = sgl_bidi_count;
3706 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3711 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3713 static int transport_new_cmd_obj(struct se_cmd *cmd)
3715 struct se_device *dev = cmd->se_dev;
3716 int set_counts = 1, rc, task_cdbs;
3719 * Setup any BIDI READ tasks and memory from
3720 * cmd->t_mem_bidi_list so the READ struct se_tasks
3721 * are queued first for the non pSCSI passthrough case.
3723 if (cmd->t_bidi_data_sg &&
3724 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3725 rc = transport_allocate_tasks(cmd,
3728 cmd->t_bidi_data_sg,
3729 cmd->t_bidi_data_nents);
3731 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3732 cmd->scsi_sense_reason =
3733 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3736 atomic_inc(&cmd->t_fe_count);
3737 atomic_inc(&cmd->t_se_count);
3741 * Setup the tasks and memory from cmd->t_mem_list
3742 * Note for BIDI transfers this will contain the WRITE payload
3744 task_cdbs = transport_allocate_tasks(cmd,
3746 cmd->data_direction,
3749 if (task_cdbs <= 0) {
3750 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3751 cmd->scsi_sense_reason =
3752 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3757 atomic_inc(&cmd->t_fe_count);
3758 atomic_inc(&cmd->t_se_count);
3761 cmd->t_task_list_num = task_cdbs;
3763 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3764 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3765 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
3769 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3771 struct scatterlist *sg = cmd->t_data_sg;
3775 * We need to take into account a possible offset here for fabrics like
3776 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3777 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3779 return kmap(sg_page(sg)) + sg->offset;
3781 EXPORT_SYMBOL(transport_kmap_first_data_page);
3783 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3785 kunmap(sg_page(cmd->t_data_sg));
3787 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3790 transport_generic_get_mem(struct se_cmd *cmd)
3792 u32 length = cmd->data_length;
3797 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3798 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3799 if (!cmd->t_data_sg)
3802 cmd->t_data_nents = nents;
3803 sg_init_table(cmd->t_data_sg, nents);
3806 u32 page_len = min_t(u32, length, PAGE_SIZE);
3807 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3811 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3819 __free_page(sg_page(&cmd->t_data_sg[i]));
3822 kfree(cmd->t_data_sg);
3823 cmd->t_data_sg = NULL;
3827 /* Reduce sectors if they are too long for the device */
3828 static inline sector_t transport_limit_task_sectors(
3829 struct se_device *dev,
3830 unsigned long long lba,
3833 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3835 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3836 if ((lba + sectors) > transport_dev_end_lba(dev))
3837 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3844 * This function can be used by HW target mode drivers to create a linked
3845 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3846 * This is intended to be called during the completion path by TCM Core
3847 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3849 void transport_do_task_sg_chain(struct se_cmd *cmd)
3851 struct scatterlist *sg_first = NULL;
3852 struct scatterlist *sg_prev = NULL;
3853 int sg_prev_nents = 0;
3854 struct scatterlist *sg;
3855 struct se_task *task;
3856 u32 chained_nents = 0;
3859 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3862 * Walk the struct se_task list and setup scatterlist chains
3863 * for each contiguously allocated struct se_task->task_sg[].
3865 list_for_each_entry(task, &cmd->t_task_list, t_list) {
3870 sg_first = task->task_sg;
3871 chained_nents = task->task_sg_nents;
3873 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3874 chained_nents += task->task_sg_nents;
3877 * For the padded tasks, use the extra SGL vector allocated
3878 * in transport_allocate_data_tasks() for the sg_prev_nents
3879 * offset into sg_chain() above.
3881 * We do not need the padding for the last task (or a single
3882 * task), but in that case we will never use the sg_prev_nents
3883 * value below which would be incorrect.
3885 sg_prev_nents = (task->task_sg_nents + 1);
3886 sg_prev = task->task_sg;
3889 * Setup the starting pointer and total t_tasks_sg_linked_no including
3890 * padding SGs for linking and to mark the end.
3892 cmd->t_tasks_sg_chained = sg_first;
3893 cmd->t_tasks_sg_chained_no = chained_nents;
3895 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3896 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3897 cmd->t_tasks_sg_chained_no);
3899 for_each_sg(cmd->t_tasks_sg_chained, sg,
3900 cmd->t_tasks_sg_chained_no, i) {
3902 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3903 i, sg, sg_page(sg), sg->length, sg->offset);
3904 if (sg_is_chain(sg))
3905 pr_debug("SG: %p sg_is_chain=1\n", sg);
3907 pr_debug("SG: %p sg_is_last=1\n", sg);
3910 EXPORT_SYMBOL(transport_do_task_sg_chain);
3913 * Break up cmd into chunks transport can handle
3915 static int transport_allocate_data_tasks(
3917 unsigned long long lba,
3918 enum dma_data_direction data_direction,
3919 struct scatterlist *sgl,
3920 unsigned int sgl_nents)
3922 struct se_task *task;
3923 struct se_device *dev = cmd->se_dev;
3924 unsigned long flags;
3926 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3927 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3928 struct scatterlist *sg;
3929 struct scatterlist *cmd_sg;
3931 WARN_ON(cmd->data_length % sector_size);
3932 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3933 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3936 for (i = 0; i < task_count; i++) {
3937 unsigned int task_size, task_sg_nents_padded;
3940 task = transport_generic_get_task(cmd, data_direction);
3944 task->task_lba = lba;
3945 task->task_sectors = min(sectors, dev_max_sectors);
3946 task->task_size = task->task_sectors * sector_size;
3949 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3950 * in order to calculate the number per task SGL entries
3952 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3954 * Check if the fabric module driver is requesting that all
3955 * struct se_task->task_sg[] be chained together.. If so,
3956 * then allocate an extra padding SG entry for linking and
3957 * marking the end of the chained SGL for every task except
3958 * the last one for (task_count > 1) operation, or skipping
3959 * the extra padding for the (task_count == 1) case.
3961 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3962 task_sg_nents_padded = (task->task_sg_nents + 1);
3964 task_sg_nents_padded = task->task_sg_nents;
3966 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3967 task_sg_nents_padded, GFP_KERNEL);
3968 if (!task->task_sg) {
3969 cmd->se_dev->transport->free_task(task);
3973 sg_init_table(task->task_sg, task_sg_nents_padded);
3975 task_size = task->task_size;
3977 /* Build new sgl, only up to task_size */
3978 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3979 if (cmd_sg->length > task_size)
3983 task_size -= cmd_sg->length;
3984 cmd_sg = sg_next(cmd_sg);
3987 lba += task->task_sectors;
3988 sectors -= task->task_sectors;
3990 spin_lock_irqsave(&cmd->t_state_lock, flags);
3991 list_add_tail(&task->t_list, &cmd->t_task_list);
3992 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3999 transport_allocate_control_task(struct se_cmd *cmd)
4001 struct se_task *task;
4002 unsigned long flags;
4004 task = transport_generic_get_task(cmd, cmd->data_direction);
4008 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4010 if (!task->task_sg) {
4011 cmd->se_dev->transport->free_task(task);
4015 memcpy(task->task_sg, cmd->t_data_sg,
4016 sizeof(struct scatterlist) * cmd->t_data_nents);
4017 task->task_size = cmd->data_length;
4018 task->task_sg_nents = cmd->t_data_nents;
4020 spin_lock_irqsave(&cmd->t_state_lock, flags);
4021 list_add_tail(&task->t_list, &cmd->t_task_list);
4022 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4024 /* Success! Return number of tasks allocated */
4028 static u32 transport_allocate_tasks(
4030 unsigned long long lba,
4031 enum dma_data_direction data_direction,
4032 struct scatterlist *sgl,
4033 unsigned int sgl_nents)
4035 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4036 if (transport_cmd_get_valid_sectors(cmd) < 0)
4039 return transport_allocate_data_tasks(cmd, lba, data_direction,
4042 return transport_allocate_control_task(cmd);
4047 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4049 * Allocate storage transport resources from a set of values predefined
4050 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4051 * Any non zero return here is treated as an "out of resource' op here.
4054 * Generate struct se_task(s) and/or their payloads for this CDB.
4056 int transport_generic_new_cmd(struct se_cmd *cmd)
4061 * Determine is the TCM fabric module has already allocated physical
4062 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4065 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4067 ret = transport_generic_get_mem(cmd);
4072 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4073 * control or data CDB types, and perform the map to backend subsystem
4074 * code from SGL memory allocated here by transport_generic_get_mem(), or
4075 * via pre-existing SGL memory setup explictly by fabric module code with
4076 * transport_generic_map_mem_to_cmd().
4078 ret = transport_new_cmd_obj(cmd);
4082 * For WRITEs, let the fabric know its buffer is ready..
4083 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4084 * will be added to the struct se_device execution queue after its WRITE
4085 * data has arrived. (ie: It gets handled by the transport processing
4086 * thread a second time)
4088 if (cmd->data_direction == DMA_TO_DEVICE) {
4089 transport_add_tasks_to_state_queue(cmd);
4090 return transport_generic_write_pending(cmd);
4093 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4094 * to the execution queue.
4096 transport_execute_tasks(cmd);
4099 EXPORT_SYMBOL(transport_generic_new_cmd);
4101 /* transport_generic_process_write():
4105 void transport_generic_process_write(struct se_cmd *cmd)
4107 transport_execute_tasks(cmd);
4109 EXPORT_SYMBOL(transport_generic_process_write);
4111 static void transport_write_pending_qf(struct se_cmd *cmd)
4113 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4114 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4116 transport_handle_queue_full(cmd, cmd->se_dev);
4120 static int transport_generic_write_pending(struct se_cmd *cmd)
4122 unsigned long flags;
4125 spin_lock_irqsave(&cmd->t_state_lock, flags);
4126 cmd->t_state = TRANSPORT_WRITE_PENDING;
4127 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4130 * Clear the se_cmd for WRITE_PENDING status in order to set
4131 * cmd->t_transport_active=0 so that transport_generic_handle_data
4132 * can be called from HW target mode interrupt code. This is safe
4133 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4134 * because the se_cmd->se_lun pointer is not being cleared.
4136 transport_cmd_check_stop(cmd, 1, 0);
4139 * Call the fabric write_pending function here to let the
4140 * frontend know that WRITE buffers are ready.
4142 ret = cmd->se_tfo->write_pending(cmd);
4148 return PYX_TRANSPORT_WRITE_PENDING;
4151 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
4152 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4153 transport_handle_queue_full(cmd, cmd->se_dev);
4158 * transport_release_cmd - free a command
4159 * @cmd: command to free
4161 * This routine unconditionally frees a command, and reference counting
4162 * or list removal must be done in the caller.
4164 void transport_release_cmd(struct se_cmd *cmd)
4166 BUG_ON(!cmd->se_tfo);
4168 if (cmd->se_tmr_req)
4169 core_tmr_release_req(cmd->se_tmr_req);
4170 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4171 kfree(cmd->t_task_cdb);
4172 cmd->se_tfo->release_cmd(cmd);
4174 EXPORT_SYMBOL(transport_release_cmd);
4176 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
4178 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4179 if (wait_for_tasks && cmd->se_tmr_req)
4180 transport_wait_for_tasks(cmd);
4182 transport_release_cmd(cmd);
4185 transport_wait_for_tasks(cmd);
4187 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4190 transport_lun_remove_cmd(cmd);
4192 transport_free_dev_tasks(cmd);
4194 transport_put_cmd(cmd);
4197 EXPORT_SYMBOL(transport_generic_free_cmd);
4199 /* transport_lun_wait_for_tasks():
4201 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4202 * an struct se_lun to be successfully shutdown.
4204 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4206 unsigned long flags;
4209 * If the frontend has already requested this struct se_cmd to
4210 * be stopped, we can safely ignore this struct se_cmd.
4212 spin_lock_irqsave(&cmd->t_state_lock, flags);
4213 if (atomic_read(&cmd->t_transport_stop)) {
4214 atomic_set(&cmd->transport_lun_stop, 0);
4215 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4216 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4217 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4218 transport_cmd_check_stop(cmd, 1, 0);
4221 atomic_set(&cmd->transport_lun_fe_stop, 1);
4222 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4224 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4226 ret = transport_stop_tasks_for_cmd(cmd);
4228 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4229 " %d\n", cmd, cmd->t_task_list_num, ret);
4231 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4232 cmd->se_tfo->get_task_tag(cmd));
4233 wait_for_completion(&cmd->transport_lun_stop_comp);
4234 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4235 cmd->se_tfo->get_task_tag(cmd));
4237 transport_remove_cmd_from_queue(cmd);
4242 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4244 struct se_cmd *cmd = NULL;
4245 unsigned long lun_flags, cmd_flags;
4247 * Do exception processing and return CHECK_CONDITION status to the
4250 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4251 while (!list_empty(&lun->lun_cmd_list)) {
4252 cmd = list_first_entry(&lun->lun_cmd_list,
4253 struct se_cmd, se_lun_node);
4254 list_del(&cmd->se_lun_node);
4256 atomic_set(&cmd->transport_lun_active, 0);
4258 * This will notify iscsi_target_transport.c:
4259 * transport_cmd_check_stop() that a LUN shutdown is in
4260 * progress for the iscsi_cmd_t.
4262 spin_lock(&cmd->t_state_lock);
4263 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4264 "_lun_stop for ITT: 0x%08x\n",
4265 cmd->se_lun->unpacked_lun,
4266 cmd->se_tfo->get_task_tag(cmd));
4267 atomic_set(&cmd->transport_lun_stop, 1);
4268 spin_unlock(&cmd->t_state_lock);
4270 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4273 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4274 cmd->se_tfo->get_task_tag(cmd),
4275 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4279 * If the Storage engine still owns the iscsi_cmd_t, determine
4280 * and/or stop its context.
4282 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4283 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4284 cmd->se_tfo->get_task_tag(cmd));
4286 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4287 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4291 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4292 "_wait_for_tasks(): SUCCESS\n",
4293 cmd->se_lun->unpacked_lun,
4294 cmd->se_tfo->get_task_tag(cmd));
4296 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4297 if (!atomic_read(&cmd->transport_dev_active)) {
4298 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4301 atomic_set(&cmd->transport_dev_active, 0);
4302 transport_all_task_dev_remove_state(cmd);
4303 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4305 transport_free_dev_tasks(cmd);
4307 * The Storage engine stopped this struct se_cmd before it was
4308 * send to the fabric frontend for delivery back to the
4309 * Initiator Node. Return this SCSI CDB back with an
4310 * CHECK_CONDITION status.
4313 transport_send_check_condition_and_sense(cmd,
4314 TCM_NON_EXISTENT_LUN, 0);
4316 * If the fabric frontend is waiting for this iscsi_cmd_t to
4317 * be released, notify the waiting thread now that LU has
4318 * finished accessing it.
4320 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4321 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4322 pr_debug("SE_LUN[%d] - Detected FE stop for"
4323 " struct se_cmd: %p ITT: 0x%08x\n",
4325 cmd, cmd->se_tfo->get_task_tag(cmd));
4327 spin_unlock_irqrestore(&cmd->t_state_lock,
4329 transport_cmd_check_stop(cmd, 1, 0);
4330 complete(&cmd->transport_lun_fe_stop_comp);
4331 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4334 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4335 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4337 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4338 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4340 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4343 static int transport_clear_lun_thread(void *p)
4345 struct se_lun *lun = (struct se_lun *)p;
4347 __transport_clear_lun_from_sessions(lun);
4348 complete(&lun->lun_shutdown_comp);
4353 int transport_clear_lun_from_sessions(struct se_lun *lun)
4355 struct task_struct *kt;
4357 kt = kthread_run(transport_clear_lun_thread, lun,
4358 "tcm_cl_%u", lun->unpacked_lun);
4360 pr_err("Unable to start clear_lun thread\n");
4363 wait_for_completion(&lun->lun_shutdown_comp);
4369 * transport_wait_for_tasks - wait for completion to occur
4370 * @cmd: command to wait
4372 * Called from frontend fabric context to wait for storage engine
4373 * to pause and/or release frontend generated struct se_cmd.
4375 void transport_wait_for_tasks(struct se_cmd *cmd)
4377 unsigned long flags;
4379 spin_lock_irqsave(&cmd->t_state_lock, flags);
4380 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4381 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4385 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4386 * has been set in transport_set_supported_SAM_opcode().
4388 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4389 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4393 * If we are already stopped due to an external event (ie: LUN shutdown)
4394 * sleep until the connection can have the passed struct se_cmd back.
4395 * The cmd->transport_lun_stopped_sem will be upped by
4396 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4397 * has completed its operation on the struct se_cmd.
4399 if (atomic_read(&cmd->transport_lun_stop)) {
4401 pr_debug("wait_for_tasks: Stopping"
4402 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4403 "_stop_comp); for ITT: 0x%08x\n",
4404 cmd->se_tfo->get_task_tag(cmd));
4406 * There is a special case for WRITES where a FE exception +
4407 * LUN shutdown means ConfigFS context is still sleeping on
4408 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4409 * We go ahead and up transport_lun_stop_comp just to be sure
4412 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4413 complete(&cmd->transport_lun_stop_comp);
4414 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4415 spin_lock_irqsave(&cmd->t_state_lock, flags);
4417 transport_all_task_dev_remove_state(cmd);
4419 * At this point, the frontend who was the originator of this
4420 * struct se_cmd, now owns the structure and can be released through
4421 * normal means below.
4423 pr_debug("wait_for_tasks: Stopped"
4424 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4425 "stop_comp); for ITT: 0x%08x\n",
4426 cmd->se_tfo->get_task_tag(cmd));
4428 atomic_set(&cmd->transport_lun_stop, 0);
4430 if (!atomic_read(&cmd->t_transport_active) ||
4431 atomic_read(&cmd->t_transport_aborted)) {
4432 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4436 atomic_set(&cmd->t_transport_stop, 1);
4438 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4439 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4440 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4441 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
4442 cmd->deferred_t_state);
4444 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4446 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4448 wait_for_completion(&cmd->t_transport_stop_comp);
4450 spin_lock_irqsave(&cmd->t_state_lock, flags);
4451 atomic_set(&cmd->t_transport_active, 0);
4452 atomic_set(&cmd->t_transport_stop, 0);
4454 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4455 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4456 cmd->se_tfo->get_task_tag(cmd));
4458 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4460 EXPORT_SYMBOL(transport_wait_for_tasks);
4462 static int transport_get_sense_codes(
4467 *asc = cmd->scsi_asc;
4468 *ascq = cmd->scsi_ascq;
4473 static int transport_set_sense_codes(
4478 cmd->scsi_asc = asc;
4479 cmd->scsi_ascq = ascq;
4484 int transport_send_check_condition_and_sense(
4489 unsigned char *buffer = cmd->sense_buffer;
4490 unsigned long flags;
4492 u8 asc = 0, ascq = 0;
4494 spin_lock_irqsave(&cmd->t_state_lock, flags);
4495 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4496 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4499 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4500 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4502 if (!reason && from_transport)
4505 if (!from_transport)
4506 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4508 * Data Segment and SenseLength of the fabric response PDU.
4510 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4511 * from include/scsi/scsi_cmnd.h
4513 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4514 TRANSPORT_SENSE_BUFFER);
4516 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4517 * SENSE KEY values from include/scsi/scsi.h
4520 case TCM_NON_EXISTENT_LUN:
4522 buffer[offset] = 0x70;
4523 /* ILLEGAL REQUEST */
4524 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4525 /* LOGICAL UNIT NOT SUPPORTED */
4526 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4528 case TCM_UNSUPPORTED_SCSI_OPCODE:
4529 case TCM_SECTOR_COUNT_TOO_MANY:
4531 buffer[offset] = 0x70;
4532 /* ILLEGAL REQUEST */
4533 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4534 /* INVALID COMMAND OPERATION CODE */
4535 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4537 case TCM_UNKNOWN_MODE_PAGE:
4539 buffer[offset] = 0x70;
4540 /* ILLEGAL REQUEST */
4541 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4542 /* INVALID FIELD IN CDB */
4543 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4545 case TCM_CHECK_CONDITION_ABORT_CMD:
4547 buffer[offset] = 0x70;
4548 /* ABORTED COMMAND */
4549 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4550 /* BUS DEVICE RESET FUNCTION OCCURRED */
4551 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4552 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4554 case TCM_INCORRECT_AMOUNT_OF_DATA:
4556 buffer[offset] = 0x70;
4557 /* ABORTED COMMAND */
4558 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4560 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4561 /* NOT ENOUGH UNSOLICITED DATA */
4562 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4564 case TCM_INVALID_CDB_FIELD:
4566 buffer[offset] = 0x70;
4567 /* ABORTED COMMAND */
4568 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4569 /* INVALID FIELD IN CDB */
4570 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4572 case TCM_INVALID_PARAMETER_LIST:
4574 buffer[offset] = 0x70;
4575 /* ABORTED COMMAND */
4576 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4577 /* INVALID FIELD IN PARAMETER LIST */
4578 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4580 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4582 buffer[offset] = 0x70;
4583 /* ABORTED COMMAND */
4584 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4586 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4587 /* UNEXPECTED_UNSOLICITED_DATA */
4588 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4590 case TCM_SERVICE_CRC_ERROR:
4592 buffer[offset] = 0x70;
4593 /* ABORTED COMMAND */
4594 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4595 /* PROTOCOL SERVICE CRC ERROR */
4596 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4598 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4600 case TCM_SNACK_REJECTED:
4602 buffer[offset] = 0x70;
4603 /* ABORTED COMMAND */
4604 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4606 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4607 /* FAILED RETRANSMISSION REQUEST */
4608 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4610 case TCM_WRITE_PROTECTED:
4612 buffer[offset] = 0x70;
4614 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4615 /* WRITE PROTECTED */
4616 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4618 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4620 buffer[offset] = 0x70;
4621 /* UNIT ATTENTION */
4622 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4623 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4624 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4625 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4627 case TCM_CHECK_CONDITION_NOT_READY:
4629 buffer[offset] = 0x70;
4631 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4632 transport_get_sense_codes(cmd, &asc, &ascq);
4633 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4634 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4636 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4639 buffer[offset] = 0x70;
4640 /* ILLEGAL REQUEST */
4641 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4642 /* LOGICAL UNIT COMMUNICATION FAILURE */
4643 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4647 * This code uses linux/include/scsi/scsi.h SAM status codes!
4649 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4651 * Automatically padded, this value is encoded in the fabric's
4652 * data_length response PDU containing the SCSI defined sense data.
4654 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4657 return cmd->se_tfo->queue_status(cmd);
4659 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4661 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4665 if (atomic_read(&cmd->t_transport_aborted) != 0) {
4667 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4670 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4671 " status for CDB: 0x%02x ITT: 0x%08x\n",
4673 cmd->se_tfo->get_task_tag(cmd));
4675 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4676 cmd->se_tfo->queue_status(cmd);
4681 EXPORT_SYMBOL(transport_check_aborted_status);
4683 void transport_send_task_abort(struct se_cmd *cmd)
4685 unsigned long flags;
4687 spin_lock_irqsave(&cmd->t_state_lock, flags);
4688 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4692 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4695 * If there are still expected incoming fabric WRITEs, we wait
4696 * until until they have completed before sending a TASK_ABORTED
4697 * response. This response with TASK_ABORTED status will be
4698 * queued back to fabric module by transport_check_aborted_status().
4700 if (cmd->data_direction == DMA_TO_DEVICE) {
4701 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4702 atomic_inc(&cmd->t_transport_aborted);
4703 smp_mb__after_atomic_inc();
4704 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4705 transport_new_cmd_failure(cmd);
4709 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4711 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4712 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4713 cmd->se_tfo->get_task_tag(cmd));
4715 cmd->se_tfo->queue_status(cmd);
4718 /* transport_generic_do_tmr():
4722 int transport_generic_do_tmr(struct se_cmd *cmd)
4724 struct se_device *dev = cmd->se_dev;
4725 struct se_tmr_req *tmr = cmd->se_tmr_req;
4728 switch (tmr->function) {
4729 case TMR_ABORT_TASK:
4730 tmr->response = TMR_FUNCTION_REJECTED;
4732 case TMR_ABORT_TASK_SET:
4734 case TMR_CLEAR_TASK_SET:
4735 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4738 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4739 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4740 TMR_FUNCTION_REJECTED;
4742 case TMR_TARGET_WARM_RESET:
4743 tmr->response = TMR_FUNCTION_REJECTED;
4745 case TMR_TARGET_COLD_RESET:
4746 tmr->response = TMR_FUNCTION_REJECTED;
4749 pr_err("Uknown TMR function: 0x%02x.\n",
4751 tmr->response = TMR_FUNCTION_REJECTED;
4755 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4756 cmd->se_tfo->queue_tm_rsp(cmd);
4758 transport_cmd_check_stop_to_fabric(cmd);
4762 /* transport_processing_thread():
4766 static int transport_processing_thread(void *param)
4770 struct se_device *dev = (struct se_device *) param;
4772 set_user_nice(current, -20);
4774 while (!kthread_should_stop()) {
4775 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4776 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4777 kthread_should_stop());
4782 __transport_execute_tasks(dev);
4784 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4788 switch (cmd->t_state) {
4789 case TRANSPORT_NEW_CMD:
4792 case TRANSPORT_NEW_CMD_MAP:
4793 if (!cmd->se_tfo->new_cmd_map) {
4794 pr_err("cmd->se_tfo->new_cmd_map is"
4795 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4798 ret = cmd->se_tfo->new_cmd_map(cmd);
4800 cmd->transport_error_status = ret;
4801 transport_generic_request_failure(cmd, NULL,
4802 0, (cmd->data_direction !=
4806 ret = transport_generic_new_cmd(cmd);
4810 cmd->transport_error_status = ret;
4811 transport_generic_request_failure(cmd, NULL,
4812 0, (cmd->data_direction !=
4816 case TRANSPORT_PROCESS_WRITE:
4817 transport_generic_process_write(cmd);
4819 case TRANSPORT_COMPLETE_OK:
4820 transport_stop_all_task_timers(cmd);
4821 transport_generic_complete_ok(cmd);
4823 case TRANSPORT_REMOVE:
4824 transport_put_cmd(cmd);
4826 case TRANSPORT_FREE_CMD_INTR:
4827 transport_generic_free_cmd(cmd, 0);
4829 case TRANSPORT_PROCESS_TMR:
4830 transport_generic_do_tmr(cmd);
4832 case TRANSPORT_COMPLETE_FAILURE:
4833 transport_generic_request_failure(cmd, NULL, 1, 1);
4835 case TRANSPORT_COMPLETE_TIMEOUT:
4836 transport_stop_all_task_timers(cmd);
4837 transport_generic_request_timeout(cmd);
4839 case TRANSPORT_COMPLETE_QF_WP:
4840 transport_write_pending_qf(cmd);
4842 case TRANSPORT_COMPLETE_QF_OK:
4843 transport_complete_qf(cmd);
4846 pr_err("Unknown t_state: %d deferred_t_state:"
4847 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
4848 " %u\n", cmd->t_state, cmd->deferred_t_state,
4849 cmd->se_tfo->get_task_tag(cmd),
4850 cmd->se_tfo->get_cmd_state(cmd),
4851 cmd->se_lun->unpacked_lun);
4859 WARN_ON(!list_empty(&dev->state_task_list));
4860 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4861 dev->process_thread = NULL;