1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
38 #include <linux/cdrom.h>
39 #include <asm/unaligned.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_tcq.h>
46 #include <target/target_core_base.h>
47 #include <target/target_core_device.h>
48 #include <target/target_core_tmr.h>
49 #include <target/target_core_tpg.h>
50 #include <target/target_core_transport.h>
51 #include <target/target_core_fabric_ops.h>
52 #include <target/target_core_configfs.h>
54 #include "target_core_alua.h"
55 #include "target_core_hba.h"
56 #include "target_core_pr.h"
57 #include "target_core_ua.h"
59 static int sub_api_initialized;
61 static struct workqueue_struct *target_completion_wq;
62 static struct kmem_cache *se_cmd_cache;
63 static struct kmem_cache *se_sess_cache;
64 struct kmem_cache *se_tmr_req_cache;
65 struct kmem_cache *se_ua_cache;
66 struct kmem_cache *t10_pr_reg_cache;
67 struct kmem_cache *t10_alua_lu_gp_cache;
68 struct kmem_cache *t10_alua_lu_gp_mem_cache;
69 struct kmem_cache *t10_alua_tg_pt_gp_cache;
70 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
72 static int transport_generic_write_pending(struct se_cmd *);
73 static int transport_processing_thread(void *param);
74 static int __transport_execute_tasks(struct se_device *dev);
75 static void transport_complete_task_attr(struct se_cmd *cmd);
76 static void transport_handle_queue_full(struct se_cmd *cmd,
77 struct se_device *dev);
78 static void transport_free_dev_tasks(struct se_cmd *cmd);
79 static int transport_generic_get_mem(struct se_cmd *cmd);
80 static void transport_put_cmd(struct se_cmd *cmd);
81 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
82 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
83 static void transport_generic_request_failure(struct se_cmd *, int, int);
84 static void target_complete_ok_work(struct work_struct *work);
86 int init_se_kmem_caches(void)
88 se_cmd_cache = kmem_cache_create("se_cmd_cache",
89 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
91 pr_err("kmem_cache_create for struct se_cmd failed\n");
94 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
95 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
97 if (!se_tmr_req_cache) {
98 pr_err("kmem_cache_create() for struct se_tmr_req"
100 goto out_free_cmd_cache;
102 se_sess_cache = kmem_cache_create("se_sess_cache",
103 sizeof(struct se_session), __alignof__(struct se_session),
105 if (!se_sess_cache) {
106 pr_err("kmem_cache_create() for struct se_session"
108 goto out_free_tmr_req_cache;
110 se_ua_cache = kmem_cache_create("se_ua_cache",
111 sizeof(struct se_ua), __alignof__(struct se_ua),
114 pr_err("kmem_cache_create() for struct se_ua failed\n");
115 goto out_free_sess_cache;
117 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
118 sizeof(struct t10_pr_registration),
119 __alignof__(struct t10_pr_registration), 0, NULL);
120 if (!t10_pr_reg_cache) {
121 pr_err("kmem_cache_create() for struct t10_pr_registration"
123 goto out_free_ua_cache;
125 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
126 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
128 if (!t10_alua_lu_gp_cache) {
129 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
131 goto out_free_pr_reg_cache;
133 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
134 sizeof(struct t10_alua_lu_gp_member),
135 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
136 if (!t10_alua_lu_gp_mem_cache) {
137 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
139 goto out_free_lu_gp_cache;
141 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
142 sizeof(struct t10_alua_tg_pt_gp),
143 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
144 if (!t10_alua_tg_pt_gp_cache) {
145 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
147 goto out_free_lu_gp_mem_cache;
149 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
150 "t10_alua_tg_pt_gp_mem_cache",
151 sizeof(struct t10_alua_tg_pt_gp_member),
152 __alignof__(struct t10_alua_tg_pt_gp_member),
154 if (!t10_alua_tg_pt_gp_mem_cache) {
155 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
157 goto out_free_tg_pt_gp_cache;
160 target_completion_wq = alloc_workqueue("target_completion",
162 if (!target_completion_wq)
163 goto out_free_tg_pt_gp_mem_cache;
167 out_free_tg_pt_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
169 out_free_tg_pt_gp_cache:
170 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
171 out_free_lu_gp_mem_cache:
172 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
173 out_free_lu_gp_cache:
174 kmem_cache_destroy(t10_alua_lu_gp_cache);
175 out_free_pr_reg_cache:
176 kmem_cache_destroy(t10_pr_reg_cache);
178 kmem_cache_destroy(se_ua_cache);
180 kmem_cache_destroy(se_sess_cache);
181 out_free_tmr_req_cache:
182 kmem_cache_destroy(se_tmr_req_cache);
184 kmem_cache_destroy(se_cmd_cache);
189 void release_se_kmem_caches(void)
191 destroy_workqueue(target_completion_wq);
192 kmem_cache_destroy(se_cmd_cache);
193 kmem_cache_destroy(se_tmr_req_cache);
194 kmem_cache_destroy(se_sess_cache);
195 kmem_cache_destroy(se_ua_cache);
196 kmem_cache_destroy(t10_pr_reg_cache);
197 kmem_cache_destroy(t10_alua_lu_gp_cache);
198 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
199 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
200 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
203 /* This code ensures unique mib indexes are handed out. */
204 static DEFINE_SPINLOCK(scsi_mib_index_lock);
205 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
208 * Allocate a new row index for the entry type specified
210 u32 scsi_get_new_index(scsi_index_t type)
214 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
216 spin_lock(&scsi_mib_index_lock);
217 new_index = ++scsi_mib_index[type];
218 spin_unlock(&scsi_mib_index_lock);
223 void transport_init_queue_obj(struct se_queue_obj *qobj)
225 atomic_set(&qobj->queue_cnt, 0);
226 INIT_LIST_HEAD(&qobj->qobj_list);
227 init_waitqueue_head(&qobj->thread_wq);
228 spin_lock_init(&qobj->cmd_queue_lock);
230 EXPORT_SYMBOL(transport_init_queue_obj);
232 void transport_subsystem_check_init(void)
236 if (sub_api_initialized)
239 ret = request_module("target_core_iblock");
241 pr_err("Unable to load target_core_iblock\n");
243 ret = request_module("target_core_file");
245 pr_err("Unable to load target_core_file\n");
247 ret = request_module("target_core_pscsi");
249 pr_err("Unable to load target_core_pscsi\n");
251 ret = request_module("target_core_stgt");
253 pr_err("Unable to load target_core_stgt\n");
255 sub_api_initialized = 1;
259 struct se_session *transport_init_session(void)
261 struct se_session *se_sess;
263 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
265 pr_err("Unable to allocate struct se_session from"
267 return ERR_PTR(-ENOMEM);
269 INIT_LIST_HEAD(&se_sess->sess_list);
270 INIT_LIST_HEAD(&se_sess->sess_acl_list);
271 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
272 INIT_LIST_HEAD(&se_sess->sess_wait_list);
273 spin_lock_init(&se_sess->sess_cmd_lock);
277 EXPORT_SYMBOL(transport_init_session);
280 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
282 void __transport_register_session(
283 struct se_portal_group *se_tpg,
284 struct se_node_acl *se_nacl,
285 struct se_session *se_sess,
286 void *fabric_sess_ptr)
288 unsigned char buf[PR_REG_ISID_LEN];
290 se_sess->se_tpg = se_tpg;
291 se_sess->fabric_sess_ptr = fabric_sess_ptr;
293 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
295 * Only set for struct se_session's that will actually be moving I/O.
296 * eg: *NOT* discovery sessions.
300 * If the fabric module supports an ISID based TransportID,
301 * save this value in binary from the fabric I_T Nexus now.
303 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
304 memset(&buf[0], 0, PR_REG_ISID_LEN);
305 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
306 &buf[0], PR_REG_ISID_LEN);
307 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
309 spin_lock_irq(&se_nacl->nacl_sess_lock);
311 * The se_nacl->nacl_sess pointer will be set to the
312 * last active I_T Nexus for each struct se_node_acl.
314 se_nacl->nacl_sess = se_sess;
316 list_add_tail(&se_sess->sess_acl_list,
317 &se_nacl->acl_sess_list);
318 spin_unlock_irq(&se_nacl->nacl_sess_lock);
320 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
322 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
323 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
325 EXPORT_SYMBOL(__transport_register_session);
327 void transport_register_session(
328 struct se_portal_group *se_tpg,
329 struct se_node_acl *se_nacl,
330 struct se_session *se_sess,
331 void *fabric_sess_ptr)
333 spin_lock_bh(&se_tpg->session_lock);
334 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
335 spin_unlock_bh(&se_tpg->session_lock);
337 EXPORT_SYMBOL(transport_register_session);
339 void transport_deregister_session_configfs(struct se_session *se_sess)
341 struct se_node_acl *se_nacl;
344 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
346 se_nacl = se_sess->se_node_acl;
348 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
349 list_del(&se_sess->sess_acl_list);
351 * If the session list is empty, then clear the pointer.
352 * Otherwise, set the struct se_session pointer from the tail
353 * element of the per struct se_node_acl active session list.
355 if (list_empty(&se_nacl->acl_sess_list))
356 se_nacl->nacl_sess = NULL;
358 se_nacl->nacl_sess = container_of(
359 se_nacl->acl_sess_list.prev,
360 struct se_session, sess_acl_list);
362 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
365 EXPORT_SYMBOL(transport_deregister_session_configfs);
367 void transport_free_session(struct se_session *se_sess)
369 kmem_cache_free(se_sess_cache, se_sess);
371 EXPORT_SYMBOL(transport_free_session);
373 void transport_deregister_session(struct se_session *se_sess)
375 struct se_portal_group *se_tpg = se_sess->se_tpg;
376 struct se_node_acl *se_nacl;
380 transport_free_session(se_sess);
384 spin_lock_irqsave(&se_tpg->session_lock, flags);
385 list_del(&se_sess->sess_list);
386 se_sess->se_tpg = NULL;
387 se_sess->fabric_sess_ptr = NULL;
388 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
391 * Determine if we need to do extra work for this initiator node's
392 * struct se_node_acl if it had been previously dynamically generated.
394 se_nacl = se_sess->se_node_acl;
396 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
397 if (se_nacl->dynamic_node_acl) {
398 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
400 list_del(&se_nacl->acl_list);
401 se_tpg->num_node_acls--;
402 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
404 core_tpg_wait_for_nacl_pr_ref(se_nacl);
405 core_free_device_list_for_node(se_nacl, se_tpg);
406 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
408 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
411 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
414 transport_free_session(se_sess);
416 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
417 se_tpg->se_tpg_tfo->get_fabric_name());
419 EXPORT_SYMBOL(transport_deregister_session);
422 * Called with cmd->t_state_lock held.
424 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
426 struct se_device *dev = cmd->se_dev;
427 struct se_task *task;
433 list_for_each_entry(task, &cmd->t_task_list, t_list) {
434 if (task->task_flags & TF_ACTIVE)
437 if (!atomic_read(&task->task_state_active))
440 spin_lock_irqsave(&dev->execute_task_lock, flags);
441 list_del(&task->t_state_list);
442 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
443 cmd->se_tfo->get_task_tag(cmd), dev, task);
444 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
446 atomic_set(&task->task_state_active, 0);
447 atomic_dec(&cmd->t_task_cdbs_ex_left);
451 /* transport_cmd_check_stop():
453 * 'transport_off = 1' determines if t_transport_active should be cleared.
454 * 'transport_off = 2' determines if task_dev_state should be removed.
456 * A non-zero u8 t_state sets cmd->t_state.
457 * Returns 1 when command is stopped, else 0.
459 static int transport_cmd_check_stop(
466 spin_lock_irqsave(&cmd->t_state_lock, flags);
468 * Determine if IOCTL context caller in requesting the stopping of this
469 * command for LUN shutdown purposes.
471 if (atomic_read(&cmd->transport_lun_stop)) {
472 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
473 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
474 cmd->se_tfo->get_task_tag(cmd));
476 atomic_set(&cmd->t_transport_active, 0);
477 if (transport_off == 2)
478 transport_all_task_dev_remove_state(cmd);
479 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
481 complete(&cmd->transport_lun_stop_comp);
485 * Determine if frontend context caller is requesting the stopping of
486 * this command for frontend exceptions.
488 if (atomic_read(&cmd->t_transport_stop)) {
489 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
490 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
491 cmd->se_tfo->get_task_tag(cmd));
493 if (transport_off == 2)
494 transport_all_task_dev_remove_state(cmd);
497 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
500 if (transport_off == 2)
502 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
504 complete(&cmd->t_transport_stop_comp);
508 atomic_set(&cmd->t_transport_active, 0);
509 if (transport_off == 2) {
510 transport_all_task_dev_remove_state(cmd);
512 * Clear struct se_cmd->se_lun before the transport_off == 2
513 * handoff to fabric module.
517 * Some fabric modules like tcm_loop can release
518 * their internally allocated I/O reference now and
521 * Fabric modules are expected to return '1' here if the
522 * se_cmd being passed is released at this point,
523 * or zero if not being released.
525 if (cmd->se_tfo->check_stop_free != NULL) {
526 spin_unlock_irqrestore(
527 &cmd->t_state_lock, flags);
529 return cmd->se_tfo->check_stop_free(cmd);
532 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
536 cmd->t_state = t_state;
537 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
542 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
544 return transport_cmd_check_stop(cmd, 2, 0);
547 static void transport_lun_remove_cmd(struct se_cmd *cmd)
549 struct se_lun *lun = cmd->se_lun;
555 spin_lock_irqsave(&cmd->t_state_lock, flags);
556 if (!atomic_read(&cmd->transport_dev_active)) {
557 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
560 atomic_set(&cmd->transport_dev_active, 0);
561 transport_all_task_dev_remove_state(cmd);
562 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
566 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
567 if (atomic_read(&cmd->transport_lun_active)) {
568 list_del(&cmd->se_lun_node);
569 atomic_set(&cmd->transport_lun_active, 0);
571 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
572 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
575 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
578 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
580 if (!cmd->se_tmr_req)
581 transport_lun_remove_cmd(cmd);
583 if (transport_cmd_check_stop_to_fabric(cmd))
586 transport_remove_cmd_from_queue(cmd);
587 transport_put_cmd(cmd);
591 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
594 struct se_device *dev = cmd->se_dev;
595 struct se_queue_obj *qobj = &dev->dev_queue_obj;
599 spin_lock_irqsave(&cmd->t_state_lock, flags);
600 cmd->t_state = t_state;
601 atomic_set(&cmd->t_transport_active, 1);
602 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
605 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
607 /* If the cmd is already on the list, remove it before we add it */
608 if (!list_empty(&cmd->se_queue_node))
609 list_del(&cmd->se_queue_node);
611 atomic_inc(&qobj->queue_cnt);
614 list_add(&cmd->se_queue_node, &qobj->qobj_list);
616 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
617 atomic_set(&cmd->t_transport_queue_active, 1);
618 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
620 wake_up_interruptible(&qobj->thread_wq);
623 static struct se_cmd *
624 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
629 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
630 if (list_empty(&qobj->qobj_list)) {
631 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
634 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
636 atomic_set(&cmd->t_transport_queue_active, 0);
638 list_del_init(&cmd->se_queue_node);
639 atomic_dec(&qobj->queue_cnt);
640 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
645 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
647 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
650 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
651 if (!atomic_read(&cmd->t_transport_queue_active)) {
652 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
655 atomic_set(&cmd->t_transport_queue_active, 0);
656 atomic_dec(&qobj->queue_cnt);
657 list_del_init(&cmd->se_queue_node);
658 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
660 if (atomic_read(&cmd->t_transport_queue_active)) {
661 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
662 cmd->se_tfo->get_task_tag(cmd),
663 atomic_read(&cmd->t_transport_queue_active));
668 * Completion function used by TCM subsystem plugins (such as FILEIO)
669 * for queueing up response from struct se_subsystem_api->do_task()
671 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
673 struct se_task *task = list_entry(cmd->t_task_list.next,
674 struct se_task, t_list);
677 cmd->scsi_status = SAM_STAT_GOOD;
678 task->task_scsi_status = GOOD;
680 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
681 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
682 task->task_se_cmd->transport_error_status =
683 PYX_TRANSPORT_ILLEGAL_REQUEST;
686 transport_complete_task(task, good);
688 EXPORT_SYMBOL(transport_complete_sync_cache);
690 static void target_complete_failure_work(struct work_struct *work)
692 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
694 transport_generic_request_failure(cmd, 1, 1);
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;
708 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
709 cmd->t_task_cdb[0], dev);
712 atomic_inc(&dev->depth_left);
714 spin_lock_irqsave(&cmd->t_state_lock, flags);
715 task->task_flags &= ~TF_ACTIVE;
718 * See if any sense data exists, if so set the TASK_SENSE flag.
719 * Also check for any other post completion work that needs to be
720 * done by the plugins.
722 if (dev && dev->transport->transport_complete) {
723 if (dev->transport->transport_complete(task) != 0) {
724 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
725 task->task_sense = 1;
731 * See if we are waiting for outstanding struct se_task
732 * to complete for an exception condition
734 if (task->task_flags & TF_REQUEST_STOP) {
735 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
736 complete(&task->task_stop_comp);
741 cmd->t_tasks_failed = 1;
744 * Decrement the outstanding t_task_cdbs_left count. The last
745 * struct se_task from struct se_cmd will complete itself into the
746 * device queue depending upon int success.
748 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
749 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
753 if (cmd->t_tasks_failed) {
754 if (!task->task_error_status) {
755 task->task_error_status =
756 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
757 cmd->transport_error_status =
758 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
760 INIT_WORK(&cmd->work, target_complete_failure_work);
762 atomic_set(&cmd->t_transport_complete, 1);
763 INIT_WORK(&cmd->work, target_complete_ok_work);
766 cmd->t_state = TRANSPORT_COMPLETE;
767 atomic_set(&cmd->t_transport_active, 1);
768 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
770 queue_work(target_completion_wq, &cmd->work);
772 EXPORT_SYMBOL(transport_complete_task);
775 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
776 * struct se_task list are ready to be added to the active execution list
779 * Called with se_dev_t->execute_task_lock called.
781 static inline int transport_add_task_check_sam_attr(
782 struct se_task *task,
783 struct se_task *task_prev,
784 struct se_device *dev)
787 * No SAM Task attribute emulation enabled, add to tail of
790 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
791 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
795 * HEAD_OF_QUEUE attribute for received CDB, which means
796 * the first task that is associated with a struct se_cmd goes to
797 * head of the struct se_device->execute_task_list, and task_prev
798 * after that for each subsequent task
800 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
801 list_add(&task->t_execute_list,
802 (task_prev != NULL) ?
803 &task_prev->t_execute_list :
804 &dev->execute_task_list);
806 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
807 " in execution queue\n",
808 task->task_se_cmd->t_task_cdb[0]);
812 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
813 * transitioned from Dermant -> Active state, and are added to the end
814 * of the struct se_device->execute_task_list
816 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
820 /* __transport_add_task_to_execute_queue():
822 * Called with se_dev_t->execute_task_lock called.
824 static void __transport_add_task_to_execute_queue(
825 struct se_task *task,
826 struct se_task *task_prev,
827 struct se_device *dev)
831 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
832 atomic_inc(&dev->execute_tasks);
834 if (atomic_read(&task->task_state_active))
837 * Determine if this task needs to go to HEAD_OF_QUEUE for the
838 * state list as well. Running with SAM Task Attribute emulation
839 * will always return head_of_queue == 0 here
842 list_add(&task->t_state_list, (task_prev) ?
843 &task_prev->t_state_list :
844 &dev->state_task_list);
846 list_add_tail(&task->t_state_list, &dev->state_task_list);
848 atomic_set(&task->task_state_active, 1);
850 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
851 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
855 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
857 struct se_device *dev = cmd->se_dev;
858 struct se_task *task;
861 spin_lock_irqsave(&cmd->t_state_lock, flags);
862 list_for_each_entry(task, &cmd->t_task_list, t_list) {
863 if (atomic_read(&task->task_state_active))
866 spin_lock(&dev->execute_task_lock);
867 list_add_tail(&task->t_state_list, &dev->state_task_list);
868 atomic_set(&task->task_state_active, 1);
870 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
871 task->task_se_cmd->se_tfo->get_task_tag(
872 task->task_se_cmd), task, dev);
874 spin_unlock(&dev->execute_task_lock);
876 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
879 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
881 struct se_device *dev = cmd->se_dev;
882 struct se_task *task, *task_prev = NULL;
885 spin_lock_irqsave(&dev->execute_task_lock, flags);
886 list_for_each_entry(task, &cmd->t_task_list, t_list) {
887 if (!list_empty(&task->t_execute_list))
890 * __transport_add_task_to_execute_queue() handles the
891 * SAM Task Attribute emulation if enabled
893 __transport_add_task_to_execute_queue(task, task_prev, dev);
896 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
899 void __transport_remove_task_from_execute_queue(struct se_task *task,
900 struct se_device *dev)
902 list_del_init(&task->t_execute_list);
903 atomic_dec(&dev->execute_tasks);
906 void transport_remove_task_from_execute_queue(
907 struct se_task *task,
908 struct se_device *dev)
912 if (WARN_ON(list_empty(&task->t_execute_list)))
915 spin_lock_irqsave(&dev->execute_task_lock, flags);
916 __transport_remove_task_from_execute_queue(task, dev);
917 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
921 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
924 static void target_qf_do_work(struct work_struct *work)
926 struct se_device *dev = container_of(work, struct se_device,
928 LIST_HEAD(qf_cmd_list);
929 struct se_cmd *cmd, *cmd_tmp;
931 spin_lock_irq(&dev->qf_cmd_lock);
932 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
933 spin_unlock_irq(&dev->qf_cmd_lock);
935 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
936 list_del(&cmd->se_qf_node);
937 atomic_dec(&dev->dev_qf_count);
938 smp_mb__after_atomic_dec();
940 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
941 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
942 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
943 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
946 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
950 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
952 switch (cmd->data_direction) {
955 case DMA_FROM_DEVICE:
959 case DMA_BIDIRECTIONAL:
968 void transport_dump_dev_state(
969 struct se_device *dev,
973 *bl += sprintf(b + *bl, "Status: ");
974 switch (dev->dev_status) {
975 case TRANSPORT_DEVICE_ACTIVATED:
976 *bl += sprintf(b + *bl, "ACTIVATED");
978 case TRANSPORT_DEVICE_DEACTIVATED:
979 *bl += sprintf(b + *bl, "DEACTIVATED");
981 case TRANSPORT_DEVICE_SHUTDOWN:
982 *bl += sprintf(b + *bl, "SHUTDOWN");
984 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
985 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
986 *bl += sprintf(b + *bl, "OFFLINE");
989 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
993 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
994 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
996 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
997 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
998 *bl += sprintf(b + *bl, " ");
1001 void transport_dump_vpd_proto_id(
1002 struct t10_vpd *vpd,
1003 unsigned char *p_buf,
1006 unsigned char buf[VPD_TMP_BUF_SIZE];
1009 memset(buf, 0, VPD_TMP_BUF_SIZE);
1010 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1012 switch (vpd->protocol_identifier) {
1014 sprintf(buf+len, "Fibre Channel\n");
1017 sprintf(buf+len, "Parallel SCSI\n");
1020 sprintf(buf+len, "SSA\n");
1023 sprintf(buf+len, "IEEE 1394\n");
1026 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1030 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1033 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1036 sprintf(buf+len, "Automation/Drive Interface Transport"
1040 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1043 sprintf(buf+len, "Unknown 0x%02x\n",
1044 vpd->protocol_identifier);
1049 strncpy(p_buf, buf, p_buf_len);
1051 pr_debug("%s", buf);
1055 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1058 * Check if the Protocol Identifier Valid (PIV) bit is set..
1060 * from spc3r23.pdf section 7.5.1
1062 if (page_83[1] & 0x80) {
1063 vpd->protocol_identifier = (page_83[0] & 0xf0);
1064 vpd->protocol_identifier_set = 1;
1065 transport_dump_vpd_proto_id(vpd, NULL, 0);
1068 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1070 int transport_dump_vpd_assoc(
1071 struct t10_vpd *vpd,
1072 unsigned char *p_buf,
1075 unsigned char buf[VPD_TMP_BUF_SIZE];
1079 memset(buf, 0, VPD_TMP_BUF_SIZE);
1080 len = sprintf(buf, "T10 VPD Identifier Association: ");
1082 switch (vpd->association) {
1084 sprintf(buf+len, "addressed logical unit\n");
1087 sprintf(buf+len, "target port\n");
1090 sprintf(buf+len, "SCSI target device\n");
1093 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1099 strncpy(p_buf, buf, p_buf_len);
1101 pr_debug("%s", buf);
1106 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1109 * The VPD identification association..
1111 * from spc3r23.pdf Section 7.6.3.1 Table 297
1113 vpd->association = (page_83[1] & 0x30);
1114 return transport_dump_vpd_assoc(vpd, NULL, 0);
1116 EXPORT_SYMBOL(transport_set_vpd_assoc);
1118 int transport_dump_vpd_ident_type(
1119 struct t10_vpd *vpd,
1120 unsigned char *p_buf,
1123 unsigned char buf[VPD_TMP_BUF_SIZE];
1127 memset(buf, 0, VPD_TMP_BUF_SIZE);
1128 len = sprintf(buf, "T10 VPD Identifier Type: ");
1130 switch (vpd->device_identifier_type) {
1132 sprintf(buf+len, "Vendor specific\n");
1135 sprintf(buf+len, "T10 Vendor ID based\n");
1138 sprintf(buf+len, "EUI-64 based\n");
1141 sprintf(buf+len, "NAA\n");
1144 sprintf(buf+len, "Relative target port identifier\n");
1147 sprintf(buf+len, "SCSI name string\n");
1150 sprintf(buf+len, "Unsupported: 0x%02x\n",
1151 vpd->device_identifier_type);
1157 if (p_buf_len < strlen(buf)+1)
1159 strncpy(p_buf, buf, p_buf_len);
1161 pr_debug("%s", buf);
1167 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1170 * The VPD identifier type..
1172 * from spc3r23.pdf Section 7.6.3.1 Table 298
1174 vpd->device_identifier_type = (page_83[1] & 0x0f);
1175 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1177 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1179 int transport_dump_vpd_ident(
1180 struct t10_vpd *vpd,
1181 unsigned char *p_buf,
1184 unsigned char buf[VPD_TMP_BUF_SIZE];
1187 memset(buf, 0, VPD_TMP_BUF_SIZE);
1189 switch (vpd->device_identifier_code_set) {
1190 case 0x01: /* Binary */
1191 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1192 &vpd->device_identifier[0]);
1194 case 0x02: /* ASCII */
1195 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1196 &vpd->device_identifier[0]);
1198 case 0x03: /* UTF-8 */
1199 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1200 &vpd->device_identifier[0]);
1203 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1204 " 0x%02x", vpd->device_identifier_code_set);
1210 strncpy(p_buf, buf, p_buf_len);
1212 pr_debug("%s", buf);
1218 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1220 static const char hex_str[] = "0123456789abcdef";
1221 int j = 0, i = 4; /* offset to start of the identifer */
1224 * The VPD Code Set (encoding)
1226 * from spc3r23.pdf Section 7.6.3.1 Table 296
1228 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1229 switch (vpd->device_identifier_code_set) {
1230 case 0x01: /* Binary */
1231 vpd->device_identifier[j++] =
1232 hex_str[vpd->device_identifier_type];
1233 while (i < (4 + page_83[3])) {
1234 vpd->device_identifier[j++] =
1235 hex_str[(page_83[i] & 0xf0) >> 4];
1236 vpd->device_identifier[j++] =
1237 hex_str[page_83[i] & 0x0f];
1241 case 0x02: /* ASCII */
1242 case 0x03: /* UTF-8 */
1243 while (i < (4 + page_83[3]))
1244 vpd->device_identifier[j++] = page_83[i++];
1250 return transport_dump_vpd_ident(vpd, NULL, 0);
1252 EXPORT_SYMBOL(transport_set_vpd_ident);
1254 static void core_setup_task_attr_emulation(struct se_device *dev)
1257 * If this device is from Target_Core_Mod/pSCSI, disable the
1258 * SAM Task Attribute emulation.
1260 * This is currently not available in upsream Linux/SCSI Target
1261 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1263 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1264 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1268 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1269 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1270 " device\n", dev->transport->name,
1271 dev->transport->get_device_rev(dev));
1274 static void scsi_dump_inquiry(struct se_device *dev)
1276 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1279 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1281 pr_debug(" Vendor: ");
1282 for (i = 0; i < 8; i++)
1283 if (wwn->vendor[i] >= 0x20)
1284 pr_debug("%c", wwn->vendor[i]);
1288 pr_debug(" Model: ");
1289 for (i = 0; i < 16; i++)
1290 if (wwn->model[i] >= 0x20)
1291 pr_debug("%c", wwn->model[i]);
1295 pr_debug(" Revision: ");
1296 for (i = 0; i < 4; i++)
1297 if (wwn->revision[i] >= 0x20)
1298 pr_debug("%c", wwn->revision[i]);
1304 device_type = dev->transport->get_device_type(dev);
1305 pr_debug(" Type: %s ", scsi_device_type(device_type));
1306 pr_debug(" ANSI SCSI revision: %02x\n",
1307 dev->transport->get_device_rev(dev));
1310 struct se_device *transport_add_device_to_core_hba(
1312 struct se_subsystem_api *transport,
1313 struct se_subsystem_dev *se_dev,
1315 void *transport_dev,
1316 struct se_dev_limits *dev_limits,
1317 const char *inquiry_prod,
1318 const char *inquiry_rev)
1321 struct se_device *dev;
1323 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1325 pr_err("Unable to allocate memory for se_dev_t\n");
1329 transport_init_queue_obj(&dev->dev_queue_obj);
1330 dev->dev_flags = device_flags;
1331 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1332 dev->dev_ptr = transport_dev;
1334 dev->se_sub_dev = se_dev;
1335 dev->transport = transport;
1336 atomic_set(&dev->active_cmds, 0);
1337 INIT_LIST_HEAD(&dev->dev_list);
1338 INIT_LIST_HEAD(&dev->dev_sep_list);
1339 INIT_LIST_HEAD(&dev->dev_tmr_list);
1340 INIT_LIST_HEAD(&dev->execute_task_list);
1341 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1342 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1343 INIT_LIST_HEAD(&dev->state_task_list);
1344 INIT_LIST_HEAD(&dev->qf_cmd_list);
1345 spin_lock_init(&dev->execute_task_lock);
1346 spin_lock_init(&dev->delayed_cmd_lock);
1347 spin_lock_init(&dev->ordered_cmd_lock);
1348 spin_lock_init(&dev->state_task_lock);
1349 spin_lock_init(&dev->dev_alua_lock);
1350 spin_lock_init(&dev->dev_reservation_lock);
1351 spin_lock_init(&dev->dev_status_lock);
1352 spin_lock_init(&dev->dev_status_thr_lock);
1353 spin_lock_init(&dev->se_port_lock);
1354 spin_lock_init(&dev->se_tmr_lock);
1355 spin_lock_init(&dev->qf_cmd_lock);
1357 dev->queue_depth = dev_limits->queue_depth;
1358 atomic_set(&dev->depth_left, dev->queue_depth);
1359 atomic_set(&dev->dev_ordered_id, 0);
1361 se_dev_set_default_attribs(dev, dev_limits);
1363 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1364 dev->creation_time = get_jiffies_64();
1365 spin_lock_init(&dev->stats_lock);
1367 spin_lock(&hba->device_lock);
1368 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1370 spin_unlock(&hba->device_lock);
1372 * Setup the SAM Task Attribute emulation for struct se_device
1374 core_setup_task_attr_emulation(dev);
1376 * Force PR and ALUA passthrough emulation with internal object use.
1378 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1380 * Setup the Reservations infrastructure for struct se_device
1382 core_setup_reservations(dev, force_pt);
1384 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1386 if (core_setup_alua(dev, force_pt) < 0)
1390 * Startup the struct se_device processing thread
1392 dev->process_thread = kthread_run(transport_processing_thread, dev,
1393 "LIO_%s", dev->transport->name);
1394 if (IS_ERR(dev->process_thread)) {
1395 pr_err("Unable to create kthread: LIO_%s\n",
1396 dev->transport->name);
1400 * Setup work_queue for QUEUE_FULL
1402 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1404 * Preload the initial INQUIRY const values if we are doing
1405 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1406 * passthrough because this is being provided by the backend LLD.
1407 * This is required so that transport_get_inquiry() copies these
1408 * originals once back into DEV_T10_WWN(dev) for the virtual device
1411 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1412 if (!inquiry_prod || !inquiry_rev) {
1413 pr_err("All non TCM/pSCSI plugins require"
1414 " INQUIRY consts\n");
1418 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1419 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1420 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1422 scsi_dump_inquiry(dev);
1426 kthread_stop(dev->process_thread);
1428 spin_lock(&hba->device_lock);
1429 list_del(&dev->dev_list);
1431 spin_unlock(&hba->device_lock);
1433 se_release_vpd_for_dev(dev);
1439 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1441 /* transport_generic_prepare_cdb():
1443 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1444 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1445 * The point of this is since we are mapping iSCSI LUNs to
1446 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1447 * devices and HBAs for a loop.
1449 static inline void transport_generic_prepare_cdb(
1453 case READ_10: /* SBC - RDProtect */
1454 case READ_12: /* SBC - RDProtect */
1455 case READ_16: /* SBC - RDProtect */
1456 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1457 case VERIFY: /* SBC - VRProtect */
1458 case VERIFY_16: /* SBC - VRProtect */
1459 case WRITE_VERIFY: /* SBC - VRProtect */
1460 case WRITE_VERIFY_12: /* SBC - VRProtect */
1463 cdb[1] &= 0x1f; /* clear logical unit number */
1468 static struct se_task *
1469 transport_generic_get_task(struct se_cmd *cmd,
1470 enum dma_data_direction data_direction)
1472 struct se_task *task;
1473 struct se_device *dev = cmd->se_dev;
1475 task = dev->transport->alloc_task(cmd->t_task_cdb);
1477 pr_err("Unable to allocate struct se_task\n");
1481 INIT_LIST_HEAD(&task->t_list);
1482 INIT_LIST_HEAD(&task->t_execute_list);
1483 INIT_LIST_HEAD(&task->t_state_list);
1484 init_completion(&task->task_stop_comp);
1485 task->task_se_cmd = cmd;
1486 task->task_data_direction = data_direction;
1491 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1494 * Used by fabric modules containing a local struct se_cmd within their
1495 * fabric dependent per I/O descriptor.
1497 void transport_init_se_cmd(
1499 struct target_core_fabric_ops *tfo,
1500 struct se_session *se_sess,
1504 unsigned char *sense_buffer)
1506 INIT_LIST_HEAD(&cmd->se_lun_node);
1507 INIT_LIST_HEAD(&cmd->se_delayed_node);
1508 INIT_LIST_HEAD(&cmd->se_ordered_node);
1509 INIT_LIST_HEAD(&cmd->se_qf_node);
1510 INIT_LIST_HEAD(&cmd->se_queue_node);
1511 INIT_LIST_HEAD(&cmd->se_cmd_list);
1512 INIT_LIST_HEAD(&cmd->t_task_list);
1513 init_completion(&cmd->transport_lun_fe_stop_comp);
1514 init_completion(&cmd->transport_lun_stop_comp);
1515 init_completion(&cmd->t_transport_stop_comp);
1516 init_completion(&cmd->cmd_wait_comp);
1517 spin_lock_init(&cmd->t_state_lock);
1518 atomic_set(&cmd->transport_dev_active, 1);
1521 cmd->se_sess = se_sess;
1522 cmd->data_length = data_length;
1523 cmd->data_direction = data_direction;
1524 cmd->sam_task_attr = task_attr;
1525 cmd->sense_buffer = sense_buffer;
1527 EXPORT_SYMBOL(transport_init_se_cmd);
1529 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1532 * Check if SAM Task Attribute emulation is enabled for this
1533 * struct se_device storage object
1535 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1538 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1539 pr_debug("SAM Task Attribute ACA"
1540 " emulation is not supported\n");
1544 * Used to determine when ORDERED commands should go from
1545 * Dormant to Active status.
1547 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1548 smp_mb__after_atomic_inc();
1549 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1550 cmd->se_ordered_id, cmd->sam_task_attr,
1551 cmd->se_dev->transport->name);
1555 /* transport_generic_allocate_tasks():
1557 * Called from fabric RX Thread.
1559 int transport_generic_allocate_tasks(
1565 transport_generic_prepare_cdb(cdb);
1567 * Ensure that the received CDB is less than the max (252 + 8) bytes
1568 * for VARIABLE_LENGTH_CMD
1570 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1571 pr_err("Received SCSI CDB with command_size: %d that"
1572 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1573 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1577 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1578 * allocate the additional extended CDB buffer now.. Otherwise
1579 * setup the pointer from __t_task_cdb to t_task_cdb.
1581 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1582 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1584 if (!cmd->t_task_cdb) {
1585 pr_err("Unable to allocate cmd->t_task_cdb"
1586 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1587 scsi_command_size(cdb),
1588 (unsigned long)sizeof(cmd->__t_task_cdb));
1592 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1594 * Copy the original CDB into cmd->
1596 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1598 * Setup the received CDB based on SCSI defined opcodes and
1599 * perform unit attention, persistent reservations and ALUA
1600 * checks for virtual device backends. The cmd->t_task_cdb
1601 * pointer is expected to be setup before we reach this point.
1603 ret = transport_generic_cmd_sequencer(cmd, cdb);
1607 * Check for SAM Task Attribute Emulation
1609 if (transport_check_alloc_task_attr(cmd) < 0) {
1610 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1611 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1614 spin_lock(&cmd->se_lun->lun_sep_lock);
1615 if (cmd->se_lun->lun_sep)
1616 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1617 spin_unlock(&cmd->se_lun->lun_sep_lock);
1620 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1623 * Used by fabric module frontends to queue tasks directly.
1624 * Many only be used from process context only
1626 int transport_handle_cdb_direct(
1633 pr_err("cmd->se_lun is NULL\n");
1636 if (in_interrupt()) {
1638 pr_err("transport_generic_handle_cdb cannot be called"
1639 " from interrupt context\n");
1643 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1644 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1645 * in existing usage to ensure that outstanding descriptors are handled
1646 * correctly during shutdown via transport_wait_for_tasks()
1648 * Also, we don't take cmd->t_state_lock here as we only expect
1649 * this to be called for initial descriptor submission.
1651 cmd->t_state = TRANSPORT_NEW_CMD;
1652 atomic_set(&cmd->t_transport_active, 1);
1654 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1655 * so follow TRANSPORT_NEW_CMD processing thread context usage
1656 * and call transport_generic_request_failure() if necessary..
1658 ret = transport_generic_new_cmd(cmd);
1660 cmd->transport_error_status = ret;
1661 transport_generic_request_failure(cmd, 0,
1662 (cmd->data_direction != DMA_TO_DEVICE));
1666 EXPORT_SYMBOL(transport_handle_cdb_direct);
1669 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1670 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1671 * complete setup in TCM process context w/ TFO->new_cmd_map().
1673 int transport_generic_handle_cdb_map(
1678 pr_err("cmd->se_lun is NULL\n");
1682 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1685 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1687 /* transport_generic_handle_data():
1691 int transport_generic_handle_data(
1695 * For the software fabric case, then we assume the nexus is being
1696 * failed/shutdown when signals are pending from the kthread context
1697 * caller, so we return a failure. For the HW target mode case running
1698 * in interrupt code, the signal_pending() check is skipped.
1700 if (!in_interrupt() && signal_pending(current))
1703 * If the received CDB has aleady been ABORTED by the generic
1704 * target engine, we now call transport_check_aborted_status()
1705 * to queue any delated TASK_ABORTED status for the received CDB to the
1706 * fabric module as we are expecting no further incoming DATA OUT
1707 * sequences at this point.
1709 if (transport_check_aborted_status(cmd, 1) != 0)
1712 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1715 EXPORT_SYMBOL(transport_generic_handle_data);
1717 /* transport_generic_handle_tmr():
1721 int transport_generic_handle_tmr(
1724 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1727 EXPORT_SYMBOL(transport_generic_handle_tmr);
1730 * If the task is active, request it to be stopped and sleep until it
1733 bool target_stop_task(struct se_task *task, unsigned long *flags)
1735 struct se_cmd *cmd = task->task_se_cmd;
1736 bool was_active = false;
1738 if (task->task_flags & TF_ACTIVE) {
1739 task->task_flags |= TF_REQUEST_STOP;
1740 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1742 pr_debug("Task %p waiting to complete\n", task);
1743 wait_for_completion(&task->task_stop_comp);
1744 pr_debug("Task %p stopped successfully\n", task);
1746 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1747 atomic_dec(&cmd->t_task_cdbs_left);
1748 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1755 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1757 struct se_task *task, *task_tmp;
1758 unsigned long flags;
1761 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1762 cmd->se_tfo->get_task_tag(cmd));
1765 * No tasks remain in the execution queue
1767 spin_lock_irqsave(&cmd->t_state_lock, flags);
1768 list_for_each_entry_safe(task, task_tmp,
1769 &cmd->t_task_list, t_list) {
1770 pr_debug("Processing task %p\n", task);
1772 * If the struct se_task has not been sent and is not active,
1773 * remove the struct se_task from the execution queue.
1775 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1776 spin_unlock_irqrestore(&cmd->t_state_lock,
1778 transport_remove_task_from_execute_queue(task,
1781 pr_debug("Task %p removed from execute queue\n", task);
1782 spin_lock_irqsave(&cmd->t_state_lock, flags);
1786 if (!target_stop_task(task, &flags)) {
1787 pr_debug("Task %p - did nothing\n", task);
1791 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1797 * Handle SAM-esque emulation for generic transport request failures.
1799 static void transport_generic_request_failure(
1806 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1807 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1808 cmd->t_task_cdb[0]);
1809 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
1810 cmd->se_tfo->get_cmd_state(cmd),
1812 cmd->transport_error_status);
1813 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1814 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1815 " t_transport_active: %d t_transport_stop: %d"
1816 " t_transport_sent: %d\n", cmd->t_task_list_num,
1817 atomic_read(&cmd->t_task_cdbs_left),
1818 atomic_read(&cmd->t_task_cdbs_sent),
1819 atomic_read(&cmd->t_task_cdbs_ex_left),
1820 atomic_read(&cmd->t_transport_active),
1821 atomic_read(&cmd->t_transport_stop),
1822 atomic_read(&cmd->t_transport_sent));
1825 * For SAM Task Attribute emulation for failed struct se_cmd
1827 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1828 transport_complete_task_attr(cmd);
1831 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1834 switch (cmd->transport_error_status) {
1835 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1836 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1838 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1839 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1841 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1842 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1844 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1845 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1847 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1849 transport_new_cmd_failure(cmd);
1851 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1852 * we force this session to fall back to session
1855 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1856 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1859 case PYX_TRANSPORT_LU_COMM_FAILURE:
1860 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1861 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1863 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1864 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1866 case PYX_TRANSPORT_WRITE_PROTECTED:
1867 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1869 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1871 * No SENSE Data payload for this case, set SCSI Status
1872 * and queue the response to $FABRIC_MOD.
1874 * Uses linux/include/scsi/scsi.h SAM status codes defs
1876 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1878 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1879 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1882 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1885 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1886 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1887 cmd->orig_fe_lun, 0x2C,
1888 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1890 ret = cmd->se_tfo->queue_status(cmd);
1891 if (ret == -EAGAIN || ret == -ENOMEM)
1894 case PYX_TRANSPORT_USE_SENSE_REASON:
1896 * struct se_cmd->scsi_sense_reason already set
1900 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1902 cmd->transport_error_status);
1903 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1907 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1908 * make the call to transport_send_check_condition_and_sense()
1909 * directly. Otherwise expect the fabric to make the call to
1910 * transport_send_check_condition_and_sense() after handling
1911 * possible unsoliticied write data payloads.
1913 if (!sc && !cmd->se_tfo->new_cmd_map)
1914 transport_new_cmd_failure(cmd);
1916 ret = transport_send_check_condition_and_sense(cmd,
1917 cmd->scsi_sense_reason, 0);
1918 if (ret == -EAGAIN || ret == -ENOMEM)
1923 transport_lun_remove_cmd(cmd);
1924 if (!transport_cmd_check_stop_to_fabric(cmd))
1929 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1930 transport_handle_queue_full(cmd, cmd->se_dev);
1933 static inline u32 transport_lba_21(unsigned char *cdb)
1935 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1938 static inline u32 transport_lba_32(unsigned char *cdb)
1940 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1943 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1945 unsigned int __v1, __v2;
1947 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1948 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1950 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1954 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1956 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1958 unsigned int __v1, __v2;
1960 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1961 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1963 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1966 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1968 unsigned long flags;
1970 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1971 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1972 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1975 static inline int transport_tcq_window_closed(struct se_device *dev)
1977 if (dev->dev_tcq_window_closed++ <
1978 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1979 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1981 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1983 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
1988 * Called from Fabric Module context from transport_execute_tasks()
1990 * The return of this function determins if the tasks from struct se_cmd
1991 * get added to the execution queue in transport_execute_tasks(),
1992 * or are added to the delayed or ordered lists here.
1994 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1996 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1999 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2000 * to allow the passed struct se_cmd list of tasks to the front of the list.
2002 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2003 atomic_inc(&cmd->se_dev->dev_hoq_count);
2004 smp_mb__after_atomic_inc();
2005 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2006 " 0x%02x, se_ordered_id: %u\n",
2008 cmd->se_ordered_id);
2010 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2011 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2012 list_add_tail(&cmd->se_ordered_node,
2013 &cmd->se_dev->ordered_cmd_list);
2014 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2016 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2017 smp_mb__after_atomic_inc();
2019 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2020 " list, se_ordered_id: %u\n",
2022 cmd->se_ordered_id);
2024 * Add ORDERED command to tail of execution queue if
2025 * no other older commands exist that need to be
2028 if (!atomic_read(&cmd->se_dev->simple_cmds))
2032 * For SIMPLE and UNTAGGED Task Attribute commands
2034 atomic_inc(&cmd->se_dev->simple_cmds);
2035 smp_mb__after_atomic_inc();
2038 * Otherwise if one or more outstanding ORDERED task attribute exist,
2039 * add the dormant task(s) built for the passed struct se_cmd to the
2040 * execution queue and become in Active state for this struct se_device.
2042 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2044 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2045 * will be drained upon completion of HEAD_OF_QUEUE task.
2047 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2048 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2049 list_add_tail(&cmd->se_delayed_node,
2050 &cmd->se_dev->delayed_cmd_list);
2051 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2053 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2054 " delayed CMD list, se_ordered_id: %u\n",
2055 cmd->t_task_cdb[0], cmd->sam_task_attr,
2056 cmd->se_ordered_id);
2058 * Return zero to let transport_execute_tasks() know
2059 * not to add the delayed tasks to the execution list.
2064 * Otherwise, no ORDERED task attributes exist..
2070 * Called from fabric module context in transport_generic_new_cmd() and
2071 * transport_generic_process_write()
2073 static int transport_execute_tasks(struct se_cmd *cmd)
2077 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2078 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2079 transport_generic_request_failure(cmd, 0, 1);
2084 * Call transport_cmd_check_stop() to see if a fabric exception
2085 * has occurred that prevents execution.
2087 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2089 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2090 * attribute for the tasks of the received struct se_cmd CDB
2092 add_tasks = transport_execute_task_attr(cmd);
2096 * This calls transport_add_tasks_from_cmd() to handle
2097 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2098 * (if enabled) in __transport_add_task_to_execute_queue() and
2099 * transport_add_task_check_sam_attr().
2101 transport_add_tasks_from_cmd(cmd);
2104 * Kick the execution queue for the cmd associated struct se_device
2108 __transport_execute_tasks(cmd->se_dev);
2113 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2114 * from struct se_device->execute_task_list and
2116 * Called from transport_processing_thread()
2118 static int __transport_execute_tasks(struct se_device *dev)
2121 struct se_cmd *cmd = NULL;
2122 struct se_task *task = NULL;
2123 unsigned long flags;
2126 * Check if there is enough room in the device and HBA queue to send
2127 * struct se_tasks to the selected transport.
2130 if (!atomic_read(&dev->depth_left))
2131 return transport_tcq_window_closed(dev);
2133 dev->dev_tcq_window_closed = 0;
2135 spin_lock_irq(&dev->execute_task_lock);
2136 if (list_empty(&dev->execute_task_list)) {
2137 spin_unlock_irq(&dev->execute_task_lock);
2140 task = list_first_entry(&dev->execute_task_list,
2141 struct se_task, t_execute_list);
2142 __transport_remove_task_from_execute_queue(task, dev);
2143 spin_unlock_irq(&dev->execute_task_lock);
2145 atomic_dec(&dev->depth_left);
2147 cmd = task->task_se_cmd;
2149 spin_lock_irqsave(&cmd->t_state_lock, flags);
2150 task->task_flags |= (TF_ACTIVE | TF_SENT);
2151 atomic_inc(&cmd->t_task_cdbs_sent);
2153 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2154 cmd->t_task_list_num)
2155 atomic_set(&cmd->t_transport_sent, 1);
2157 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2159 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2160 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2161 * struct se_subsystem_api->do_task() caller below.
2163 if (cmd->transport_emulate_cdb) {
2164 error = cmd->transport_emulate_cdb(cmd);
2166 cmd->transport_error_status = error;
2167 spin_lock_irqsave(&cmd->t_state_lock, flags);
2168 task->task_flags &= ~TF_ACTIVE;
2169 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2170 atomic_set(&cmd->t_transport_sent, 0);
2171 transport_stop_tasks_for_cmd(cmd);
2172 atomic_inc(&dev->depth_left);
2173 transport_generic_request_failure(cmd, 0, 1);
2177 * Handle the successful completion for transport_emulate_cdb()
2178 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2179 * Otherwise the caller is expected to complete the task with
2182 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2183 cmd->scsi_status = SAM_STAT_GOOD;
2184 task->task_scsi_status = GOOD;
2185 transport_complete_task(task, 1);
2189 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2190 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2191 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2192 * LUN emulation code.
2194 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2195 * call ->do_task() directly and let the underlying TCM subsystem plugin
2196 * code handle the CDB emulation.
2198 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2199 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2200 error = transport_emulate_control_cdb(task);
2202 error = dev->transport->do_task(task);
2205 cmd->transport_error_status = error;
2206 spin_lock_irqsave(&cmd->t_state_lock, flags);
2207 task->task_flags &= ~TF_ACTIVE;
2208 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2209 atomic_set(&cmd->t_transport_sent, 0);
2210 transport_stop_tasks_for_cmd(cmd);
2211 atomic_inc(&dev->depth_left);
2212 transport_generic_request_failure(cmd, 0, 1);
2221 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2223 unsigned long flags;
2225 * Any unsolicited data will get dumped for failed command inside of
2228 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2229 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2230 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2231 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2234 static inline u32 transport_get_sectors_6(
2239 struct se_device *dev = cmd->se_dev;
2242 * Assume TYPE_DISK for non struct se_device objects.
2243 * Use 8-bit sector value.
2249 * Use 24-bit allocation length for TYPE_TAPE.
2251 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2252 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2255 * Everything else assume TYPE_DISK Sector CDB location.
2256 * Use 8-bit sector value.
2262 static inline u32 transport_get_sectors_10(
2267 struct se_device *dev = cmd->se_dev;
2270 * Assume TYPE_DISK for non struct se_device objects.
2271 * Use 16-bit sector value.
2277 * XXX_10 is not defined in SSC, throw an exception
2279 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2285 * Everything else assume TYPE_DISK Sector CDB location.
2286 * Use 16-bit sector value.
2289 return (u32)(cdb[7] << 8) + cdb[8];
2292 static inline u32 transport_get_sectors_12(
2297 struct se_device *dev = cmd->se_dev;
2300 * Assume TYPE_DISK for non struct se_device objects.
2301 * Use 32-bit sector value.
2307 * XXX_12 is not defined in SSC, throw an exception
2309 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2315 * Everything else assume TYPE_DISK Sector CDB location.
2316 * Use 32-bit sector value.
2319 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2322 static inline u32 transport_get_sectors_16(
2327 struct se_device *dev = cmd->se_dev;
2330 * Assume TYPE_DISK for non struct se_device objects.
2331 * Use 32-bit sector value.
2337 * Use 24-bit allocation length for TYPE_TAPE.
2339 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2340 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2343 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2344 (cdb[12] << 8) + cdb[13];
2348 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2350 static inline u32 transport_get_sectors_32(
2356 * Assume TYPE_DISK for non struct se_device objects.
2357 * Use 32-bit sector value.
2359 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2360 (cdb[30] << 8) + cdb[31];
2364 static inline u32 transport_get_size(
2369 struct se_device *dev = cmd->se_dev;
2371 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2372 if (cdb[1] & 1) { /* sectors */
2373 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2378 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2379 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2380 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2381 dev->transport->name);
2383 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2386 static void transport_xor_callback(struct se_cmd *cmd)
2388 unsigned char *buf, *addr;
2389 struct scatterlist *sg;
2390 unsigned int offset;
2394 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2396 * 1) read the specified logical block(s);
2397 * 2) transfer logical blocks from the data-out buffer;
2398 * 3) XOR the logical blocks transferred from the data-out buffer with
2399 * the logical blocks read, storing the resulting XOR data in a buffer;
2400 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2401 * blocks transferred from the data-out buffer; and
2402 * 5) transfer the resulting XOR data to the data-in buffer.
2404 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2406 pr_err("Unable to allocate xor_callback buf\n");
2410 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2411 * into the locally allocated *buf
2413 sg_copy_to_buffer(cmd->t_data_sg,
2419 * Now perform the XOR against the BIDI read memory located at
2420 * cmd->t_mem_bidi_list
2424 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2425 addr = kmap_atomic(sg_page(sg), KM_USER0);
2429 for (i = 0; i < sg->length; i++)
2430 *(addr + sg->offset + i) ^= *(buf + offset + i);
2432 offset += sg->length;
2433 kunmap_atomic(addr, KM_USER0);
2441 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2443 static int transport_get_sense_data(struct se_cmd *cmd)
2445 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2446 struct se_device *dev = cmd->se_dev;
2447 struct se_task *task = NULL, *task_tmp;
2448 unsigned long flags;
2451 WARN_ON(!cmd->se_lun);
2456 spin_lock_irqsave(&cmd->t_state_lock, flags);
2457 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2458 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2462 list_for_each_entry_safe(task, task_tmp,
2463 &cmd->t_task_list, t_list) {
2464 if (!task->task_sense)
2467 if (!dev->transport->get_sense_buffer) {
2468 pr_err("dev->transport->get_sense_buffer"
2473 sense_buffer = dev->transport->get_sense_buffer(task);
2474 if (!sense_buffer) {
2475 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2476 " sense buffer for task with sense\n",
2477 cmd->se_tfo->get_task_tag(cmd), task);
2480 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2482 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2483 TRANSPORT_SENSE_BUFFER);
2485 memcpy(&buffer[offset], sense_buffer,
2486 TRANSPORT_SENSE_BUFFER);
2487 cmd->scsi_status = task->task_scsi_status;
2488 /* Automatically padded */
2489 cmd->scsi_sense_length =
2490 (TRANSPORT_SENSE_BUFFER + offset);
2492 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2494 dev->se_hba->hba_id, dev->transport->name,
2498 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2504 transport_handle_reservation_conflict(struct se_cmd *cmd)
2506 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2507 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2508 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2510 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2511 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2514 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2517 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2518 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2519 cmd->orig_fe_lun, 0x2C,
2520 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2524 static inline long long transport_dev_end_lba(struct se_device *dev)
2526 return dev->transport->get_blocks(dev) + 1;
2529 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2531 struct se_device *dev = cmd->se_dev;
2534 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2537 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2539 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2540 pr_err("LBA: %llu Sectors: %u exceeds"
2541 " transport_dev_end_lba(): %llu\n",
2542 cmd->t_task_lba, sectors,
2543 transport_dev_end_lba(dev));
2550 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2553 * Determine if the received WRITE_SAME is used to for direct
2554 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2555 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2556 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2558 int passthrough = (dev->transport->transport_type ==
2559 TRANSPORT_PLUGIN_PHBA_PDEV);
2562 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2563 pr_err("WRITE_SAME PBDATA and LBDATA"
2564 " bits not supported for Block Discard"
2569 * Currently for the emulated case we only accept
2570 * tpws with the UNMAP=1 bit set.
2572 if (!(flags[0] & 0x08)) {
2573 pr_err("WRITE_SAME w/o UNMAP bit not"
2574 " supported for Block Discard Emulation\n");
2582 /* transport_generic_cmd_sequencer():
2584 * Generic Command Sequencer that should work for most DAS transport
2587 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2590 * FIXME: Need to support other SCSI OPCODES where as well.
2592 static int transport_generic_cmd_sequencer(
2596 struct se_device *dev = cmd->se_dev;
2597 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2598 int ret = 0, sector_ret = 0, passthrough;
2599 u32 sectors = 0, size = 0, pr_reg_type = 0;
2603 * Check for an existing UNIT ATTENTION condition
2605 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2606 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2607 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2611 * Check status of Asymmetric Logical Unit Assignment port
2613 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2616 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2617 * The ALUA additional sense code qualifier (ASCQ) is determined
2618 * by the ALUA primary or secondary access state..
2622 pr_debug("[%s]: ALUA TG Port not available,"
2623 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2624 cmd->se_tfo->get_fabric_name(), alua_ascq);
2626 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2627 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2628 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2631 goto out_invalid_cdb_field;
2634 * Check status for SPC-3 Persistent Reservations
2636 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2637 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2638 cmd, cdb, pr_reg_type) != 0)
2639 return transport_handle_reservation_conflict(cmd);
2641 * This means the CDB is allowed for the SCSI Initiator port
2642 * when said port is *NOT* holding the legacy SPC-2 or
2643 * SPC-3 Persistent Reservation.
2649 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2651 goto out_unsupported_cdb;
2652 size = transport_get_size(sectors, cdb, cmd);
2653 cmd->t_task_lba = transport_lba_21(cdb);
2654 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2657 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2659 goto out_unsupported_cdb;
2660 size = transport_get_size(sectors, cdb, cmd);
2661 cmd->t_task_lba = transport_lba_32(cdb);
2662 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2665 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2667 goto out_unsupported_cdb;
2668 size = transport_get_size(sectors, cdb, cmd);
2669 cmd->t_task_lba = transport_lba_32(cdb);
2670 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2673 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2675 goto out_unsupported_cdb;
2676 size = transport_get_size(sectors, cdb, cmd);
2677 cmd->t_task_lba = transport_lba_64(cdb);
2678 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2681 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2683 goto out_unsupported_cdb;
2684 size = transport_get_size(sectors, cdb, cmd);
2685 cmd->t_task_lba = transport_lba_21(cdb);
2686 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2689 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2691 goto out_unsupported_cdb;
2692 size = transport_get_size(sectors, cdb, cmd);
2693 cmd->t_task_lba = transport_lba_32(cdb);
2694 cmd->t_tasks_fua = (cdb[1] & 0x8);
2695 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2698 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2700 goto out_unsupported_cdb;
2701 size = transport_get_size(sectors, cdb, cmd);
2702 cmd->t_task_lba = transport_lba_32(cdb);
2703 cmd->t_tasks_fua = (cdb[1] & 0x8);
2704 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2707 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2709 goto out_unsupported_cdb;
2710 size = transport_get_size(sectors, cdb, cmd);
2711 cmd->t_task_lba = transport_lba_64(cdb);
2712 cmd->t_tasks_fua = (cdb[1] & 0x8);
2713 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2715 case XDWRITEREAD_10:
2716 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2717 !(cmd->t_tasks_bidi))
2718 goto out_invalid_cdb_field;
2719 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2721 goto out_unsupported_cdb;
2722 size = transport_get_size(sectors, cdb, cmd);
2723 cmd->t_task_lba = transport_lba_32(cdb);
2724 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2726 if (dev->transport->transport_type ==
2727 TRANSPORT_PLUGIN_PHBA_PDEV)
2728 goto out_unsupported_cdb;
2730 * Setup BIDI XOR callback to be run after I/O completion.
2732 cmd->transport_complete_callback = &transport_xor_callback;
2733 cmd->t_tasks_fua = (cdb[1] & 0x8);
2735 case VARIABLE_LENGTH_CMD:
2736 service_action = get_unaligned_be16(&cdb[8]);
2738 * Determine if this is TCM/PSCSI device and we should disable
2739 * internal emulation for this CDB.
2741 passthrough = (dev->transport->transport_type ==
2742 TRANSPORT_PLUGIN_PHBA_PDEV);
2744 switch (service_action) {
2745 case XDWRITEREAD_32:
2746 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2748 goto out_unsupported_cdb;
2749 size = transport_get_size(sectors, cdb, cmd);
2751 * Use WRITE_32 and READ_32 opcodes for the emulated
2752 * XDWRITE_READ_32 logic.
2754 cmd->t_task_lba = transport_lba_64_ext(cdb);
2755 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2758 goto out_unsupported_cdb;
2760 * Setup BIDI XOR callback to be run during after I/O
2763 cmd->transport_complete_callback = &transport_xor_callback;
2764 cmd->t_tasks_fua = (cdb[10] & 0x8);
2767 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2769 goto out_unsupported_cdb;
2772 size = transport_get_size(1, cdb, cmd);
2774 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2776 goto out_invalid_cdb_field;
2779 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2780 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2782 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2783 goto out_invalid_cdb_field;
2787 pr_err("VARIABLE_LENGTH_CMD service action"
2788 " 0x%04x not supported\n", service_action);
2789 goto out_unsupported_cdb;
2792 case MAINTENANCE_IN:
2793 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2794 /* MAINTENANCE_IN from SCC-2 */
2796 * Check for emulated MI_REPORT_TARGET_PGS.
2798 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2799 cmd->transport_emulate_cdb =
2800 (su_dev->t10_alua.alua_type ==
2801 SPC3_ALUA_EMULATED) ?
2802 core_emulate_report_target_port_groups :
2805 size = (cdb[6] << 24) | (cdb[7] << 16) |
2806 (cdb[8] << 8) | cdb[9];
2808 /* GPCMD_SEND_KEY from multi media commands */
2809 size = (cdb[8] << 8) + cdb[9];
2811 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2815 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2817 case MODE_SELECT_10:
2818 size = (cdb[7] << 8) + cdb[8];
2819 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2823 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2826 case GPCMD_READ_BUFFER_CAPACITY:
2827 case GPCMD_SEND_OPC:
2830 size = (cdb[7] << 8) + cdb[8];
2831 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2833 case READ_BLOCK_LIMITS:
2834 size = READ_BLOCK_LEN;
2835 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2837 case GPCMD_GET_CONFIGURATION:
2838 case GPCMD_READ_FORMAT_CAPACITIES:
2839 case GPCMD_READ_DISC_INFO:
2840 case GPCMD_READ_TRACK_RZONE_INFO:
2841 size = (cdb[7] << 8) + cdb[8];
2842 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2844 case PERSISTENT_RESERVE_IN:
2845 case PERSISTENT_RESERVE_OUT:
2846 cmd->transport_emulate_cdb =
2847 (su_dev->t10_pr.res_type ==
2848 SPC3_PERSISTENT_RESERVATIONS) ?
2849 core_scsi3_emulate_pr : NULL;
2850 size = (cdb[7] << 8) + cdb[8];
2851 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2853 case GPCMD_MECHANISM_STATUS:
2854 case GPCMD_READ_DVD_STRUCTURE:
2855 size = (cdb[8] << 8) + cdb[9];
2856 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2859 size = READ_POSITION_LEN;
2860 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2862 case MAINTENANCE_OUT:
2863 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2864 /* MAINTENANCE_OUT from SCC-2
2866 * Check for emulated MO_SET_TARGET_PGS.
2868 if (cdb[1] == MO_SET_TARGET_PGS) {
2869 cmd->transport_emulate_cdb =
2870 (su_dev->t10_alua.alua_type ==
2871 SPC3_ALUA_EMULATED) ?
2872 core_emulate_set_target_port_groups :
2876 size = (cdb[6] << 24) | (cdb[7] << 16) |
2877 (cdb[8] << 8) | cdb[9];
2879 /* GPCMD_REPORT_KEY from multi media commands */
2880 size = (cdb[8] << 8) + cdb[9];
2882 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2885 size = (cdb[3] << 8) + cdb[4];
2887 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2888 * See spc4r17 section 5.3
2890 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2891 cmd->sam_task_attr = MSG_HEAD_TAG;
2892 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2895 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2896 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2899 size = READ_CAP_LEN;
2900 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2902 case READ_MEDIA_SERIAL_NUMBER:
2903 case SECURITY_PROTOCOL_IN:
2904 case SECURITY_PROTOCOL_OUT:
2905 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2906 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2908 case SERVICE_ACTION_IN:
2909 case ACCESS_CONTROL_IN:
2910 case ACCESS_CONTROL_OUT:
2912 case READ_ATTRIBUTE:
2913 case RECEIVE_COPY_RESULTS:
2914 case WRITE_ATTRIBUTE:
2915 size = (cdb[10] << 24) | (cdb[11] << 16) |
2916 (cdb[12] << 8) | cdb[13];
2917 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2919 case RECEIVE_DIAGNOSTIC:
2920 case SEND_DIAGNOSTIC:
2921 size = (cdb[3] << 8) | cdb[4];
2922 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2924 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2927 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2928 size = (2336 * sectors);
2929 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2934 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2938 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2940 case READ_ELEMENT_STATUS:
2941 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2942 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2945 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2946 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2951 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2952 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2954 if (cdb[0] == RESERVE_10)
2955 size = (cdb[7] << 8) | cdb[8];
2957 size = cmd->data_length;
2960 * Setup the legacy emulated handler for SPC-2 and
2961 * >= SPC-3 compatible reservation handling (CRH=1)
2962 * Otherwise, we assume the underlying SCSI logic is
2963 * is running in SPC_PASSTHROUGH, and wants reservations
2964 * emulation disabled.
2966 cmd->transport_emulate_cdb =
2967 (su_dev->t10_pr.res_type !=
2969 core_scsi2_emulate_crh : NULL;
2970 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2975 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2976 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2978 if (cdb[0] == RELEASE_10)
2979 size = (cdb[7] << 8) | cdb[8];
2981 size = cmd->data_length;
2983 cmd->transport_emulate_cdb =
2984 (su_dev->t10_pr.res_type !=
2986 core_scsi2_emulate_crh : NULL;
2987 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2989 case SYNCHRONIZE_CACHE:
2990 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2992 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2994 if (cdb[0] == SYNCHRONIZE_CACHE) {
2995 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2996 cmd->t_task_lba = transport_lba_32(cdb);
2998 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2999 cmd->t_task_lba = transport_lba_64(cdb);
3002 goto out_unsupported_cdb;
3004 size = transport_get_size(sectors, cdb, cmd);
3005 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3008 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3010 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3013 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3014 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3016 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3018 * Check to ensure that LBA + Range does not exceed past end of
3019 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3021 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3022 if (transport_cmd_get_valid_sectors(cmd) < 0)
3023 goto out_invalid_cdb_field;
3027 size = get_unaligned_be16(&cdb[7]);
3028 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3031 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3033 goto out_unsupported_cdb;
3036 size = transport_get_size(1, cdb, cmd);
3038 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3039 goto out_invalid_cdb_field;
3042 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3043 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3045 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3046 goto out_invalid_cdb_field;
3049 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3051 goto out_unsupported_cdb;
3054 size = transport_get_size(1, cdb, cmd);
3056 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3057 goto out_invalid_cdb_field;
3060 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3061 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3063 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3064 * of byte 1 bit 3 UNMAP instead of original reserved field
3066 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3067 goto out_invalid_cdb_field;
3069 case ALLOW_MEDIUM_REMOVAL:
3070 case GPCMD_CLOSE_TRACK:
3072 case INITIALIZE_ELEMENT_STATUS:
3073 case GPCMD_LOAD_UNLOAD:
3076 case GPCMD_SET_SPEED:
3079 case TEST_UNIT_READY:
3081 case WRITE_FILEMARKS:
3083 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3086 cmd->transport_emulate_cdb =
3087 transport_core_report_lun_response;
3088 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3090 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3091 * See spc4r17 section 5.3
3093 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3094 cmd->sam_task_attr = MSG_HEAD_TAG;
3095 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3098 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3099 " 0x%02x, sending CHECK_CONDITION.\n",
3100 cmd->se_tfo->get_fabric_name(), cdb[0]);
3101 goto out_unsupported_cdb;
3104 if (size != cmd->data_length) {
3105 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3106 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3107 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3108 cmd->data_length, size, cdb[0]);
3110 cmd->cmd_spdtl = size;
3112 if (cmd->data_direction == DMA_TO_DEVICE) {
3113 pr_err("Rejecting underflow/overflow"
3115 goto out_invalid_cdb_field;
3118 * Reject READ_* or WRITE_* with overflow/underflow for
3119 * type SCF_SCSI_DATA_SG_IO_CDB.
3121 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3122 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3123 " CDB on non 512-byte sector setup subsystem"
3124 " plugin: %s\n", dev->transport->name);
3125 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3126 goto out_invalid_cdb_field;
3129 if (size > cmd->data_length) {
3130 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3131 cmd->residual_count = (size - cmd->data_length);
3133 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3134 cmd->residual_count = (cmd->data_length - size);
3136 cmd->data_length = size;
3139 /* Let's limit control cdbs to a page, for simplicity's sake. */
3140 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3142 goto out_invalid_cdb_field;
3144 transport_set_supported_SAM_opcode(cmd);
3147 out_unsupported_cdb:
3148 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3149 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3151 out_invalid_cdb_field:
3152 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3153 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3158 * Called from I/O completion to determine which dormant/delayed
3159 * and ordered cmds need to have their tasks added to the execution queue.
3161 static void transport_complete_task_attr(struct se_cmd *cmd)
3163 struct se_device *dev = cmd->se_dev;
3164 struct se_cmd *cmd_p, *cmd_tmp;
3165 int new_active_tasks = 0;
3167 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3168 atomic_dec(&dev->simple_cmds);
3169 smp_mb__after_atomic_dec();
3170 dev->dev_cur_ordered_id++;
3171 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3172 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3173 cmd->se_ordered_id);
3174 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3175 atomic_dec(&dev->dev_hoq_count);
3176 smp_mb__after_atomic_dec();
3177 dev->dev_cur_ordered_id++;
3178 pr_debug("Incremented dev_cur_ordered_id: %u for"
3179 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3180 cmd->se_ordered_id);
3181 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3182 spin_lock(&dev->ordered_cmd_lock);
3183 list_del(&cmd->se_ordered_node);
3184 atomic_dec(&dev->dev_ordered_sync);
3185 smp_mb__after_atomic_dec();
3186 spin_unlock(&dev->ordered_cmd_lock);
3188 dev->dev_cur_ordered_id++;
3189 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3190 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3193 * Process all commands up to the last received
3194 * ORDERED task attribute which requires another blocking
3197 spin_lock(&dev->delayed_cmd_lock);
3198 list_for_each_entry_safe(cmd_p, cmd_tmp,
3199 &dev->delayed_cmd_list, se_delayed_node) {
3201 list_del(&cmd_p->se_delayed_node);
3202 spin_unlock(&dev->delayed_cmd_lock);
3204 pr_debug("Calling add_tasks() for"
3205 " cmd_p: 0x%02x Task Attr: 0x%02x"
3206 " Dormant -> Active, se_ordered_id: %u\n",
3207 cmd_p->t_task_cdb[0],
3208 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3210 transport_add_tasks_from_cmd(cmd_p);
3213 spin_lock(&dev->delayed_cmd_lock);
3214 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3217 spin_unlock(&dev->delayed_cmd_lock);
3219 * If new tasks have become active, wake up the transport thread
3220 * to do the processing of the Active tasks.
3222 if (new_active_tasks != 0)
3223 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3226 static void transport_complete_qf(struct se_cmd *cmd)
3230 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3231 transport_complete_task_attr(cmd);
3233 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3234 ret = cmd->se_tfo->queue_status(cmd);
3239 switch (cmd->data_direction) {
3240 case DMA_FROM_DEVICE:
3241 ret = cmd->se_tfo->queue_data_in(cmd);
3244 if (cmd->t_bidi_data_sg) {
3245 ret = cmd->se_tfo->queue_data_in(cmd);
3249 /* Fall through for DMA_TO_DEVICE */
3251 ret = cmd->se_tfo->queue_status(cmd);
3259 transport_handle_queue_full(cmd, cmd->se_dev);
3262 transport_lun_remove_cmd(cmd);
3263 transport_cmd_check_stop_to_fabric(cmd);
3266 static void transport_handle_queue_full(
3268 struct se_device *dev)
3270 spin_lock_irq(&dev->qf_cmd_lock);
3271 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3272 atomic_inc(&dev->dev_qf_count);
3273 smp_mb__after_atomic_inc();
3274 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3276 schedule_work(&cmd->se_dev->qf_work_queue);
3279 static void target_complete_ok_work(struct work_struct *work)
3281 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3282 int reason = 0, ret;
3285 * Check if we need to move delayed/dormant tasks from cmds on the
3286 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3289 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3290 transport_complete_task_attr(cmd);
3292 * Check to schedule QUEUE_FULL work, or execute an existing
3293 * cmd->transport_qf_callback()
3295 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3296 schedule_work(&cmd->se_dev->qf_work_queue);
3299 * Check if we need to retrieve a sense buffer from
3300 * the struct se_cmd in question.
3302 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3303 if (transport_get_sense_data(cmd) < 0)
3304 reason = TCM_NON_EXISTENT_LUN;
3307 * Only set when an struct se_task->task_scsi_status returned
3308 * a non GOOD status.
3310 if (cmd->scsi_status) {
3311 ret = transport_send_check_condition_and_sense(
3313 if (ret == -EAGAIN || ret == -ENOMEM)
3316 transport_lun_remove_cmd(cmd);
3317 transport_cmd_check_stop_to_fabric(cmd);
3322 * Check for a callback, used by amongst other things
3323 * XDWRITE_READ_10 emulation.
3325 if (cmd->transport_complete_callback)
3326 cmd->transport_complete_callback(cmd);
3328 switch (cmd->data_direction) {
3329 case DMA_FROM_DEVICE:
3330 spin_lock(&cmd->se_lun->lun_sep_lock);
3331 if (cmd->se_lun->lun_sep) {
3332 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3335 spin_unlock(&cmd->se_lun->lun_sep_lock);
3337 ret = cmd->se_tfo->queue_data_in(cmd);
3338 if (ret == -EAGAIN || ret == -ENOMEM)
3342 spin_lock(&cmd->se_lun->lun_sep_lock);
3343 if (cmd->se_lun->lun_sep) {
3344 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3347 spin_unlock(&cmd->se_lun->lun_sep_lock);
3349 * Check if we need to send READ payload for BIDI-COMMAND
3351 if (cmd->t_bidi_data_sg) {
3352 spin_lock(&cmd->se_lun->lun_sep_lock);
3353 if (cmd->se_lun->lun_sep) {
3354 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3357 spin_unlock(&cmd->se_lun->lun_sep_lock);
3358 ret = cmd->se_tfo->queue_data_in(cmd);
3359 if (ret == -EAGAIN || ret == -ENOMEM)
3363 /* Fall through for DMA_TO_DEVICE */
3365 ret = cmd->se_tfo->queue_status(cmd);
3366 if (ret == -EAGAIN || ret == -ENOMEM)
3373 transport_lun_remove_cmd(cmd);
3374 transport_cmd_check_stop_to_fabric(cmd);
3378 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3379 " data_direction: %d\n", cmd, cmd->data_direction);
3380 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3381 transport_handle_queue_full(cmd, cmd->se_dev);
3384 static void transport_free_dev_tasks(struct se_cmd *cmd)
3386 struct se_task *task, *task_tmp;
3387 unsigned long flags;
3388 LIST_HEAD(dispose_list);
3390 spin_lock_irqsave(&cmd->t_state_lock, flags);
3391 list_for_each_entry_safe(task, task_tmp,
3392 &cmd->t_task_list, t_list) {
3393 if (!(task->task_flags & TF_ACTIVE))
3394 list_move_tail(&task->t_list, &dispose_list);
3396 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3398 while (!list_empty(&dispose_list)) {
3399 task = list_first_entry(&dispose_list, struct se_task, t_list);
3401 if (task->task_sg != cmd->t_data_sg &&
3402 task->task_sg != cmd->t_bidi_data_sg)
3403 kfree(task->task_sg);
3405 list_del(&task->t_list);
3407 cmd->se_dev->transport->free_task(task);
3411 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3413 struct scatterlist *sg;
3416 for_each_sg(sgl, sg, nents, count)
3417 __free_page(sg_page(sg));
3422 static inline void transport_free_pages(struct se_cmd *cmd)
3424 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3427 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3428 cmd->t_data_sg = NULL;
3429 cmd->t_data_nents = 0;
3431 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3432 cmd->t_bidi_data_sg = NULL;
3433 cmd->t_bidi_data_nents = 0;
3437 * transport_put_cmd - release a reference to a command
3438 * @cmd: command to release
3440 * This routine releases our reference to the command and frees it if possible.
3442 static void transport_put_cmd(struct se_cmd *cmd)
3444 unsigned long flags;
3447 spin_lock_irqsave(&cmd->t_state_lock, flags);
3448 if (atomic_read(&cmd->t_fe_count)) {
3449 if (!atomic_dec_and_test(&cmd->t_fe_count))
3453 if (atomic_read(&cmd->t_se_count)) {
3454 if (!atomic_dec_and_test(&cmd->t_se_count))
3458 if (atomic_read(&cmd->transport_dev_active)) {
3459 atomic_set(&cmd->transport_dev_active, 0);
3460 transport_all_task_dev_remove_state(cmd);
3463 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3465 if (free_tasks != 0)
3466 transport_free_dev_tasks(cmd);
3468 transport_free_pages(cmd);
3469 transport_release_cmd(cmd);
3472 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3476 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3477 * allocating in the core.
3478 * @cmd: Associated se_cmd descriptor
3479 * @mem: SGL style memory for TCM WRITE / READ
3480 * @sg_mem_num: Number of SGL elements
3481 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3482 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3484 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3487 int transport_generic_map_mem_to_cmd(
3489 struct scatterlist *sgl,
3491 struct scatterlist *sgl_bidi,
3494 if (!sgl || !sgl_count)
3497 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3498 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3500 cmd->t_data_sg = sgl;
3501 cmd->t_data_nents = sgl_count;
3503 if (sgl_bidi && sgl_bidi_count) {
3504 cmd->t_bidi_data_sg = sgl_bidi;
3505 cmd->t_bidi_data_nents = sgl_bidi_count;
3507 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3512 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3514 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3516 struct scatterlist *sg = cmd->t_data_sg;
3520 * We need to take into account a possible offset here for fabrics like
3521 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3522 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3524 return kmap(sg_page(sg)) + sg->offset;
3526 EXPORT_SYMBOL(transport_kmap_first_data_page);
3528 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3530 kunmap(sg_page(cmd->t_data_sg));
3532 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3535 transport_generic_get_mem(struct se_cmd *cmd)
3537 u32 length = cmd->data_length;
3542 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3543 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3544 if (!cmd->t_data_sg)
3547 cmd->t_data_nents = nents;
3548 sg_init_table(cmd->t_data_sg, nents);
3551 u32 page_len = min_t(u32, length, PAGE_SIZE);
3552 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3556 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3564 __free_page(sg_page(&cmd->t_data_sg[i]));
3567 kfree(cmd->t_data_sg);
3568 cmd->t_data_sg = NULL;
3572 /* Reduce sectors if they are too long for the device */
3573 static inline sector_t transport_limit_task_sectors(
3574 struct se_device *dev,
3575 unsigned long long lba,
3578 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3580 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3581 if ((lba + sectors) > transport_dev_end_lba(dev))
3582 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3589 * This function can be used by HW target mode drivers to create a linked
3590 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3591 * This is intended to be called during the completion path by TCM Core
3592 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3594 void transport_do_task_sg_chain(struct se_cmd *cmd)
3596 struct scatterlist *sg_first = NULL;
3597 struct scatterlist *sg_prev = NULL;
3598 int sg_prev_nents = 0;
3599 struct scatterlist *sg;
3600 struct se_task *task;
3601 u32 chained_nents = 0;
3604 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3607 * Walk the struct se_task list and setup scatterlist chains
3608 * for each contiguously allocated struct se_task->task_sg[].
3610 list_for_each_entry(task, &cmd->t_task_list, t_list) {
3615 sg_first = task->task_sg;
3616 chained_nents = task->task_sg_nents;
3618 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3619 chained_nents += task->task_sg_nents;
3622 * For the padded tasks, use the extra SGL vector allocated
3623 * in transport_allocate_data_tasks() for the sg_prev_nents
3624 * offset into sg_chain() above.
3626 * We do not need the padding for the last task (or a single
3627 * task), but in that case we will never use the sg_prev_nents
3628 * value below which would be incorrect.
3630 sg_prev_nents = (task->task_sg_nents + 1);
3631 sg_prev = task->task_sg;
3634 * Setup the starting pointer and total t_tasks_sg_linked_no including
3635 * padding SGs for linking and to mark the end.
3637 cmd->t_tasks_sg_chained = sg_first;
3638 cmd->t_tasks_sg_chained_no = chained_nents;
3640 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3641 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3642 cmd->t_tasks_sg_chained_no);
3644 for_each_sg(cmd->t_tasks_sg_chained, sg,
3645 cmd->t_tasks_sg_chained_no, i) {
3647 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3648 i, sg, sg_page(sg), sg->length, sg->offset);
3649 if (sg_is_chain(sg))
3650 pr_debug("SG: %p sg_is_chain=1\n", sg);
3652 pr_debug("SG: %p sg_is_last=1\n", sg);
3655 EXPORT_SYMBOL(transport_do_task_sg_chain);
3658 * Break up cmd into chunks transport can handle
3661 transport_allocate_data_tasks(struct se_cmd *cmd,
3662 enum dma_data_direction data_direction,
3663 struct scatterlist *cmd_sg, unsigned int sgl_nents)
3665 struct se_device *dev = cmd->se_dev;
3667 unsigned long long lba;
3668 sector_t sectors, dev_max_sectors;
3671 if (transport_cmd_get_valid_sectors(cmd) < 0)
3674 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3675 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3677 WARN_ON(cmd->data_length % sector_size);
3679 lba = cmd->t_task_lba;
3680 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3681 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3684 * If we need just a single task reuse the SG list in the command
3685 * and avoid a lot of work.
3687 if (task_count == 1) {
3688 struct se_task *task;
3689 unsigned long flags;
3691 task = transport_generic_get_task(cmd, data_direction);
3695 task->task_sg = cmd_sg;
3696 task->task_sg_nents = sgl_nents;
3698 task->task_lba = lba;
3699 task->task_sectors = sectors;
3700 task->task_size = task->task_sectors * sector_size;
3702 spin_lock_irqsave(&cmd->t_state_lock, flags);
3703 list_add_tail(&task->t_list, &cmd->t_task_list);
3704 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3709 for (i = 0; i < task_count; i++) {
3710 struct se_task *task;
3711 unsigned int task_size, task_sg_nents_padded;
3712 struct scatterlist *sg;
3713 unsigned long flags;
3716 task = transport_generic_get_task(cmd, data_direction);
3720 task->task_lba = lba;
3721 task->task_sectors = min(sectors, dev_max_sectors);
3722 task->task_size = task->task_sectors * sector_size;
3725 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3726 * in order to calculate the number per task SGL entries
3728 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3730 * Check if the fabric module driver is requesting that all
3731 * struct se_task->task_sg[] be chained together.. If so,
3732 * then allocate an extra padding SG entry for linking and
3733 * marking the end of the chained SGL for every task except
3734 * the last one for (task_count > 1) operation, or skipping
3735 * the extra padding for the (task_count == 1) case.
3737 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3738 task_sg_nents_padded = (task->task_sg_nents + 1);
3740 task_sg_nents_padded = task->task_sg_nents;
3742 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3743 task_sg_nents_padded, GFP_KERNEL);
3744 if (!task->task_sg) {
3745 cmd->se_dev->transport->free_task(task);
3749 sg_init_table(task->task_sg, task_sg_nents_padded);
3751 task_size = task->task_size;
3753 /* Build new sgl, only up to task_size */
3754 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3755 if (cmd_sg->length > task_size)
3759 task_size -= cmd_sg->length;
3760 cmd_sg = sg_next(cmd_sg);
3763 lba += task->task_sectors;
3764 sectors -= task->task_sectors;
3766 spin_lock_irqsave(&cmd->t_state_lock, flags);
3767 list_add_tail(&task->t_list, &cmd->t_task_list);
3768 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3775 transport_allocate_control_task(struct se_cmd *cmd)
3777 struct se_task *task;
3778 unsigned long flags;
3780 task = transport_generic_get_task(cmd, cmd->data_direction);
3784 task->task_sg = cmd->t_data_sg;
3785 task->task_size = cmd->data_length;
3786 task->task_sg_nents = cmd->t_data_nents;
3788 spin_lock_irqsave(&cmd->t_state_lock, flags);
3789 list_add_tail(&task->t_list, &cmd->t_task_list);
3790 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3792 /* Success! Return number of tasks allocated */
3797 * Allocate any required ressources to execute the command, and either place
3798 * it on the execution queue if possible. For writes we might not have the
3799 * payload yet, thus notify the fabric via a call to ->write_pending instead.
3801 int transport_generic_new_cmd(struct se_cmd *cmd)
3803 struct se_device *dev = cmd->se_dev;
3804 int task_cdbs, task_cdbs_bidi = 0;
3809 * Determine is the TCM fabric module has already allocated physical
3810 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3813 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3815 ret = transport_generic_get_mem(cmd);
3821 * For BIDI command set up the read tasks first.
3823 if (cmd->t_bidi_data_sg &&
3824 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3825 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3827 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3828 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3829 cmd->t_bidi_data_nents);
3830 if (task_cdbs_bidi <= 0)
3833 atomic_inc(&cmd->t_fe_count);
3834 atomic_inc(&cmd->t_se_count);
3838 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3839 task_cdbs = transport_allocate_data_tasks(cmd,
3840 cmd->data_direction, cmd->t_data_sg,
3843 task_cdbs = transport_allocate_control_task(cmd);
3850 atomic_inc(&cmd->t_fe_count);
3851 atomic_inc(&cmd->t_se_count);
3854 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3855 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3856 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3859 * For WRITEs, let the fabric know its buffer is ready..
3860 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3861 * will be added to the struct se_device execution queue after its WRITE
3862 * data has arrived. (ie: It gets handled by the transport processing
3863 * thread a second time)
3865 if (cmd->data_direction == DMA_TO_DEVICE) {
3866 transport_add_tasks_to_state_queue(cmd);
3867 return transport_generic_write_pending(cmd);
3870 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3871 * to the execution queue.
3873 transport_execute_tasks(cmd);
3877 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3878 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3881 EXPORT_SYMBOL(transport_generic_new_cmd);
3883 /* transport_generic_process_write():
3887 void transport_generic_process_write(struct se_cmd *cmd)
3889 transport_execute_tasks(cmd);
3891 EXPORT_SYMBOL(transport_generic_process_write);
3893 static void transport_write_pending_qf(struct se_cmd *cmd)
3897 ret = cmd->se_tfo->write_pending(cmd);
3898 if (ret == -EAGAIN || ret == -ENOMEM) {
3899 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3901 transport_handle_queue_full(cmd, cmd->se_dev);
3905 static int transport_generic_write_pending(struct se_cmd *cmd)
3907 unsigned long flags;
3910 spin_lock_irqsave(&cmd->t_state_lock, flags);
3911 cmd->t_state = TRANSPORT_WRITE_PENDING;
3912 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3915 * Clear the se_cmd for WRITE_PENDING status in order to set
3916 * cmd->t_transport_active=0 so that transport_generic_handle_data
3917 * can be called from HW target mode interrupt code. This is safe
3918 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3919 * because the se_cmd->se_lun pointer is not being cleared.
3921 transport_cmd_check_stop(cmd, 1, 0);
3924 * Call the fabric write_pending function here to let the
3925 * frontend know that WRITE buffers are ready.
3927 ret = cmd->se_tfo->write_pending(cmd);
3928 if (ret == -EAGAIN || ret == -ENOMEM)
3933 return PYX_TRANSPORT_WRITE_PENDING;
3936 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3937 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3938 transport_handle_queue_full(cmd, cmd->se_dev);
3943 * transport_release_cmd - free a command
3944 * @cmd: command to free
3946 * This routine unconditionally frees a command, and reference counting
3947 * or list removal must be done in the caller.
3949 void transport_release_cmd(struct se_cmd *cmd)
3951 BUG_ON(!cmd->se_tfo);
3953 if (cmd->se_tmr_req)
3954 core_tmr_release_req(cmd->se_tmr_req);
3955 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3956 kfree(cmd->t_task_cdb);
3958 * Check if target_wait_for_sess_cmds() is expecting to
3959 * release se_cmd directly here..
3961 if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3962 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3965 cmd->se_tfo->release_cmd(cmd);
3967 EXPORT_SYMBOL(transport_release_cmd);
3969 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3971 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3972 if (wait_for_tasks && cmd->se_tmr_req)
3973 transport_wait_for_tasks(cmd);
3975 transport_release_cmd(cmd);
3978 transport_wait_for_tasks(cmd);
3980 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3983 transport_lun_remove_cmd(cmd);
3985 transport_free_dev_tasks(cmd);
3987 transport_put_cmd(cmd);
3990 EXPORT_SYMBOL(transport_generic_free_cmd);
3992 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3993 * @se_sess: session to reference
3994 * @se_cmd: command descriptor to add
3996 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3998 unsigned long flags;
4000 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4001 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4002 se_cmd->check_release = 1;
4003 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4005 EXPORT_SYMBOL(target_get_sess_cmd);
4007 /* target_put_sess_cmd - Check for active I/O shutdown or list delete
4008 * @se_sess: session to reference
4009 * @se_cmd: command descriptor to drop
4011 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4013 unsigned long flags;
4015 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4016 if (list_empty(&se_cmd->se_cmd_list)) {
4017 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4022 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4023 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4024 complete(&se_cmd->cmd_wait_comp);
4027 list_del(&se_cmd->se_cmd_list);
4028 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4032 EXPORT_SYMBOL(target_put_sess_cmd);
4034 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4035 * @se_sess: session to split
4037 void target_splice_sess_cmd_list(struct se_session *se_sess)
4039 struct se_cmd *se_cmd;
4040 unsigned long flags;
4042 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4043 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4045 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4046 se_sess->sess_tearing_down = 1;
4048 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4050 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4051 se_cmd->cmd_wait_set = 1;
4053 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4055 EXPORT_SYMBOL(target_splice_sess_cmd_list);
4057 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4058 * @se_sess: session to wait for active I/O
4059 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4061 void target_wait_for_sess_cmds(
4062 struct se_session *se_sess,
4065 struct se_cmd *se_cmd, *tmp_cmd;
4068 list_for_each_entry_safe(se_cmd, tmp_cmd,
4069 &se_sess->sess_wait_list, se_cmd_list) {
4070 list_del(&se_cmd->se_cmd_list);
4072 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4073 " %d\n", se_cmd, se_cmd->t_state,
4074 se_cmd->se_tfo->get_cmd_state(se_cmd));
4076 if (wait_for_tasks) {
4077 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4078 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4079 se_cmd->se_tfo->get_cmd_state(se_cmd));
4081 rc = transport_wait_for_tasks(se_cmd);
4083 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4084 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4085 se_cmd->se_tfo->get_cmd_state(se_cmd));
4089 wait_for_completion(&se_cmd->cmd_wait_comp);
4090 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4091 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4092 se_cmd->se_tfo->get_cmd_state(se_cmd));
4095 se_cmd->se_tfo->release_cmd(se_cmd);
4098 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4100 /* transport_lun_wait_for_tasks():
4102 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4103 * an struct se_lun to be successfully shutdown.
4105 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4107 unsigned long flags;
4110 * If the frontend has already requested this struct se_cmd to
4111 * be stopped, we can safely ignore this struct se_cmd.
4113 spin_lock_irqsave(&cmd->t_state_lock, flags);
4114 if (atomic_read(&cmd->t_transport_stop)) {
4115 atomic_set(&cmd->transport_lun_stop, 0);
4116 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4117 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4118 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4119 transport_cmd_check_stop(cmd, 1, 0);
4122 atomic_set(&cmd->transport_lun_fe_stop, 1);
4123 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4125 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4127 ret = transport_stop_tasks_for_cmd(cmd);
4129 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4130 " %d\n", cmd, cmd->t_task_list_num, ret);
4132 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4133 cmd->se_tfo->get_task_tag(cmd));
4134 wait_for_completion(&cmd->transport_lun_stop_comp);
4135 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4136 cmd->se_tfo->get_task_tag(cmd));
4138 transport_remove_cmd_from_queue(cmd);
4143 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4145 struct se_cmd *cmd = NULL;
4146 unsigned long lun_flags, cmd_flags;
4148 * Do exception processing and return CHECK_CONDITION status to the
4151 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4152 while (!list_empty(&lun->lun_cmd_list)) {
4153 cmd = list_first_entry(&lun->lun_cmd_list,
4154 struct se_cmd, se_lun_node);
4155 list_del(&cmd->se_lun_node);
4157 atomic_set(&cmd->transport_lun_active, 0);
4159 * This will notify iscsi_target_transport.c:
4160 * transport_cmd_check_stop() that a LUN shutdown is in
4161 * progress for the iscsi_cmd_t.
4163 spin_lock(&cmd->t_state_lock);
4164 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4165 "_lun_stop for ITT: 0x%08x\n",
4166 cmd->se_lun->unpacked_lun,
4167 cmd->se_tfo->get_task_tag(cmd));
4168 atomic_set(&cmd->transport_lun_stop, 1);
4169 spin_unlock(&cmd->t_state_lock);
4171 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4174 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4175 cmd->se_tfo->get_task_tag(cmd),
4176 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4180 * If the Storage engine still owns the iscsi_cmd_t, determine
4181 * and/or stop its context.
4183 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4184 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4185 cmd->se_tfo->get_task_tag(cmd));
4187 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4188 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4192 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4193 "_wait_for_tasks(): SUCCESS\n",
4194 cmd->se_lun->unpacked_lun,
4195 cmd->se_tfo->get_task_tag(cmd));
4197 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4198 if (!atomic_read(&cmd->transport_dev_active)) {
4199 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4202 atomic_set(&cmd->transport_dev_active, 0);
4203 transport_all_task_dev_remove_state(cmd);
4204 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4206 transport_free_dev_tasks(cmd);
4208 * The Storage engine stopped this struct se_cmd before it was
4209 * send to the fabric frontend for delivery back to the
4210 * Initiator Node. Return this SCSI CDB back with an
4211 * CHECK_CONDITION status.
4214 transport_send_check_condition_and_sense(cmd,
4215 TCM_NON_EXISTENT_LUN, 0);
4217 * If the fabric frontend is waiting for this iscsi_cmd_t to
4218 * be released, notify the waiting thread now that LU has
4219 * finished accessing it.
4221 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4222 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4223 pr_debug("SE_LUN[%d] - Detected FE stop for"
4224 " struct se_cmd: %p ITT: 0x%08x\n",
4226 cmd, cmd->se_tfo->get_task_tag(cmd));
4228 spin_unlock_irqrestore(&cmd->t_state_lock,
4230 transport_cmd_check_stop(cmd, 1, 0);
4231 complete(&cmd->transport_lun_fe_stop_comp);
4232 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4235 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4236 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4238 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4239 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4241 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4244 static int transport_clear_lun_thread(void *p)
4246 struct se_lun *lun = (struct se_lun *)p;
4248 __transport_clear_lun_from_sessions(lun);
4249 complete(&lun->lun_shutdown_comp);
4254 int transport_clear_lun_from_sessions(struct se_lun *lun)
4256 struct task_struct *kt;
4258 kt = kthread_run(transport_clear_lun_thread, lun,
4259 "tcm_cl_%u", lun->unpacked_lun);
4261 pr_err("Unable to start clear_lun thread\n");
4264 wait_for_completion(&lun->lun_shutdown_comp);
4270 * transport_wait_for_tasks - wait for completion to occur
4271 * @cmd: command to wait
4273 * Called from frontend fabric context to wait for storage engine
4274 * to pause and/or release frontend generated struct se_cmd.
4276 bool transport_wait_for_tasks(struct se_cmd *cmd)
4278 unsigned long flags;
4280 spin_lock_irqsave(&cmd->t_state_lock, flags);
4281 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4282 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4286 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4287 * has been set in transport_set_supported_SAM_opcode().
4289 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4290 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4294 * If we are already stopped due to an external event (ie: LUN shutdown)
4295 * sleep until the connection can have the passed struct se_cmd back.
4296 * The cmd->transport_lun_stopped_sem will be upped by
4297 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4298 * has completed its operation on the struct se_cmd.
4300 if (atomic_read(&cmd->transport_lun_stop)) {
4302 pr_debug("wait_for_tasks: Stopping"
4303 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4304 "_stop_comp); for ITT: 0x%08x\n",
4305 cmd->se_tfo->get_task_tag(cmd));
4307 * There is a special case for WRITES where a FE exception +
4308 * LUN shutdown means ConfigFS context is still sleeping on
4309 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4310 * We go ahead and up transport_lun_stop_comp just to be sure
4313 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4314 complete(&cmd->transport_lun_stop_comp);
4315 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4316 spin_lock_irqsave(&cmd->t_state_lock, flags);
4318 transport_all_task_dev_remove_state(cmd);
4320 * At this point, the frontend who was the originator of this
4321 * struct se_cmd, now owns the structure and can be released through
4322 * normal means below.
4324 pr_debug("wait_for_tasks: Stopped"
4325 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4326 "stop_comp); for ITT: 0x%08x\n",
4327 cmd->se_tfo->get_task_tag(cmd));
4329 atomic_set(&cmd->transport_lun_stop, 0);
4331 if (!atomic_read(&cmd->t_transport_active) ||
4332 atomic_read(&cmd->t_transport_aborted)) {
4333 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4337 atomic_set(&cmd->t_transport_stop, 1);
4339 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4340 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4341 cmd, cmd->se_tfo->get_task_tag(cmd),
4342 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4344 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4346 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4348 wait_for_completion(&cmd->t_transport_stop_comp);
4350 spin_lock_irqsave(&cmd->t_state_lock, flags);
4351 atomic_set(&cmd->t_transport_active, 0);
4352 atomic_set(&cmd->t_transport_stop, 0);
4354 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4355 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4356 cmd->se_tfo->get_task_tag(cmd));
4358 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4362 EXPORT_SYMBOL(transport_wait_for_tasks);
4364 static int transport_get_sense_codes(
4369 *asc = cmd->scsi_asc;
4370 *ascq = cmd->scsi_ascq;
4375 static int transport_set_sense_codes(
4380 cmd->scsi_asc = asc;
4381 cmd->scsi_ascq = ascq;
4386 int transport_send_check_condition_and_sense(
4391 unsigned char *buffer = cmd->sense_buffer;
4392 unsigned long flags;
4394 u8 asc = 0, ascq = 0;
4396 spin_lock_irqsave(&cmd->t_state_lock, flags);
4397 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4398 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4401 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4402 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4404 if (!reason && from_transport)
4407 if (!from_transport)
4408 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4410 * Data Segment and SenseLength of the fabric response PDU.
4412 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4413 * from include/scsi/scsi_cmnd.h
4415 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4416 TRANSPORT_SENSE_BUFFER);
4418 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4419 * SENSE KEY values from include/scsi/scsi.h
4422 case TCM_NON_EXISTENT_LUN:
4424 buffer[offset] = 0x70;
4425 /* ILLEGAL REQUEST */
4426 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4427 /* LOGICAL UNIT NOT SUPPORTED */
4428 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4430 case TCM_UNSUPPORTED_SCSI_OPCODE:
4431 case TCM_SECTOR_COUNT_TOO_MANY:
4433 buffer[offset] = 0x70;
4434 /* ILLEGAL REQUEST */
4435 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4436 /* INVALID COMMAND OPERATION CODE */
4437 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4439 case TCM_UNKNOWN_MODE_PAGE:
4441 buffer[offset] = 0x70;
4442 /* ILLEGAL REQUEST */
4443 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4444 /* INVALID FIELD IN CDB */
4445 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4447 case TCM_CHECK_CONDITION_ABORT_CMD:
4449 buffer[offset] = 0x70;
4450 /* ABORTED COMMAND */
4451 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4452 /* BUS DEVICE RESET FUNCTION OCCURRED */
4453 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4454 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4456 case TCM_INCORRECT_AMOUNT_OF_DATA:
4458 buffer[offset] = 0x70;
4459 /* ABORTED COMMAND */
4460 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4462 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4463 /* NOT ENOUGH UNSOLICITED DATA */
4464 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4466 case TCM_INVALID_CDB_FIELD:
4468 buffer[offset] = 0x70;
4469 /* ABORTED COMMAND */
4470 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4471 /* INVALID FIELD IN CDB */
4472 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4474 case TCM_INVALID_PARAMETER_LIST:
4476 buffer[offset] = 0x70;
4477 /* ABORTED COMMAND */
4478 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4479 /* INVALID FIELD IN PARAMETER LIST */
4480 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4482 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4484 buffer[offset] = 0x70;
4485 /* ABORTED COMMAND */
4486 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4488 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4489 /* UNEXPECTED_UNSOLICITED_DATA */
4490 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4492 case TCM_SERVICE_CRC_ERROR:
4494 buffer[offset] = 0x70;
4495 /* ABORTED COMMAND */
4496 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4497 /* PROTOCOL SERVICE CRC ERROR */
4498 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4500 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4502 case TCM_SNACK_REJECTED:
4504 buffer[offset] = 0x70;
4505 /* ABORTED COMMAND */
4506 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4508 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4509 /* FAILED RETRANSMISSION REQUEST */
4510 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4512 case TCM_WRITE_PROTECTED:
4514 buffer[offset] = 0x70;
4516 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4517 /* WRITE PROTECTED */
4518 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4520 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4522 buffer[offset] = 0x70;
4523 /* UNIT ATTENTION */
4524 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4525 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4526 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4527 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4529 case TCM_CHECK_CONDITION_NOT_READY:
4531 buffer[offset] = 0x70;
4533 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4534 transport_get_sense_codes(cmd, &asc, &ascq);
4535 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4536 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4538 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4541 buffer[offset] = 0x70;
4542 /* ILLEGAL REQUEST */
4543 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4544 /* LOGICAL UNIT COMMUNICATION FAILURE */
4545 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4549 * This code uses linux/include/scsi/scsi.h SAM status codes!
4551 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4553 * Automatically padded, this value is encoded in the fabric's
4554 * data_length response PDU containing the SCSI defined sense data.
4556 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4559 return cmd->se_tfo->queue_status(cmd);
4561 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4563 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4567 if (atomic_read(&cmd->t_transport_aborted) != 0) {
4569 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4572 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4573 " status for CDB: 0x%02x ITT: 0x%08x\n",
4575 cmd->se_tfo->get_task_tag(cmd));
4577 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4578 cmd->se_tfo->queue_status(cmd);
4583 EXPORT_SYMBOL(transport_check_aborted_status);
4585 void transport_send_task_abort(struct se_cmd *cmd)
4587 unsigned long flags;
4589 spin_lock_irqsave(&cmd->t_state_lock, flags);
4590 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4591 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4594 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4597 * If there are still expected incoming fabric WRITEs, we wait
4598 * until until they have completed before sending a TASK_ABORTED
4599 * response. This response with TASK_ABORTED status will be
4600 * queued back to fabric module by transport_check_aborted_status().
4602 if (cmd->data_direction == DMA_TO_DEVICE) {
4603 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4604 atomic_inc(&cmd->t_transport_aborted);
4605 smp_mb__after_atomic_inc();
4606 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4607 transport_new_cmd_failure(cmd);
4611 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4613 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4614 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4615 cmd->se_tfo->get_task_tag(cmd));
4617 cmd->se_tfo->queue_status(cmd);
4620 /* transport_generic_do_tmr():
4624 int transport_generic_do_tmr(struct se_cmd *cmd)
4626 struct se_device *dev = cmd->se_dev;
4627 struct se_tmr_req *tmr = cmd->se_tmr_req;
4630 switch (tmr->function) {
4631 case TMR_ABORT_TASK:
4632 tmr->response = TMR_FUNCTION_REJECTED;
4634 case TMR_ABORT_TASK_SET:
4636 case TMR_CLEAR_TASK_SET:
4637 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4640 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4641 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4642 TMR_FUNCTION_REJECTED;
4644 case TMR_TARGET_WARM_RESET:
4645 tmr->response = TMR_FUNCTION_REJECTED;
4647 case TMR_TARGET_COLD_RESET:
4648 tmr->response = TMR_FUNCTION_REJECTED;
4651 pr_err("Uknown TMR function: 0x%02x.\n",
4653 tmr->response = TMR_FUNCTION_REJECTED;
4657 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4658 cmd->se_tfo->queue_tm_rsp(cmd);
4660 transport_cmd_check_stop_to_fabric(cmd);
4664 /* transport_processing_thread():
4668 static int transport_processing_thread(void *param)
4672 struct se_device *dev = (struct se_device *) param;
4674 set_user_nice(current, -20);
4676 while (!kthread_should_stop()) {
4677 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4678 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4679 kthread_should_stop());
4684 __transport_execute_tasks(dev);
4686 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4690 switch (cmd->t_state) {
4691 case TRANSPORT_NEW_CMD:
4694 case TRANSPORT_NEW_CMD_MAP:
4695 if (!cmd->se_tfo->new_cmd_map) {
4696 pr_err("cmd->se_tfo->new_cmd_map is"
4697 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4700 ret = cmd->se_tfo->new_cmd_map(cmd);
4702 cmd->transport_error_status = ret;
4703 transport_generic_request_failure(cmd,
4704 0, (cmd->data_direction !=
4708 ret = transport_generic_new_cmd(cmd);
4710 cmd->transport_error_status = ret;
4711 transport_generic_request_failure(cmd,
4712 0, (cmd->data_direction !=
4716 case TRANSPORT_PROCESS_WRITE:
4717 transport_generic_process_write(cmd);
4719 case TRANSPORT_PROCESS_TMR:
4720 transport_generic_do_tmr(cmd);
4722 case TRANSPORT_COMPLETE_QF_WP:
4723 transport_write_pending_qf(cmd);
4725 case TRANSPORT_COMPLETE_QF_OK:
4726 transport_complete_qf(cmd);
4729 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4730 "i_state: %d on SE LUN: %u\n",
4732 cmd->se_tfo->get_task_tag(cmd),
4733 cmd->se_tfo->get_cmd_state(cmd),
4734 cmd->se_lun->unpacked_lun);
4742 WARN_ON(!list_empty(&dev->state_task_list));
4743 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4744 dev->process_thread = NULL;