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_cdb.h"
56 #include "target_core_hba.h"
57 #include "target_core_pr.h"
58 #include "target_core_ua.h"
60 static int sub_api_initialized;
62 static struct workqueue_struct *target_completion_wq;
63 static struct kmem_cache *se_cmd_cache;
64 static struct kmem_cache *se_sess_cache;
65 struct kmem_cache *se_tmr_req_cache;
66 struct kmem_cache *se_ua_cache;
67 struct kmem_cache *t10_pr_reg_cache;
68 struct kmem_cache *t10_alua_lu_gp_cache;
69 struct kmem_cache *t10_alua_lu_gp_mem_cache;
70 struct kmem_cache *t10_alua_tg_pt_gp_cache;
71 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
73 static int transport_generic_write_pending(struct se_cmd *);
74 static int transport_processing_thread(void *param);
75 static int __transport_execute_tasks(struct se_device *dev);
76 static void transport_complete_task_attr(struct se_cmd *cmd);
77 static void transport_handle_queue_full(struct se_cmd *cmd,
78 struct se_device *dev);
79 static void transport_free_dev_tasks(struct se_cmd *cmd);
80 static int transport_generic_get_mem(struct se_cmd *cmd);
81 static void transport_put_cmd(struct se_cmd *cmd);
82 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
83 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
84 static void transport_generic_request_failure(struct se_cmd *, int, int);
85 static void target_complete_ok_work(struct work_struct *work);
87 int init_se_kmem_caches(void)
89 se_cmd_cache = kmem_cache_create("se_cmd_cache",
90 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
92 pr_err("kmem_cache_create for struct se_cmd failed\n");
95 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
96 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
98 if (!se_tmr_req_cache) {
99 pr_err("kmem_cache_create() for struct se_tmr_req"
101 goto out_free_cmd_cache;
103 se_sess_cache = kmem_cache_create("se_sess_cache",
104 sizeof(struct se_session), __alignof__(struct se_session),
106 if (!se_sess_cache) {
107 pr_err("kmem_cache_create() for struct se_session"
109 goto out_free_tmr_req_cache;
111 se_ua_cache = kmem_cache_create("se_ua_cache",
112 sizeof(struct se_ua), __alignof__(struct se_ua),
115 pr_err("kmem_cache_create() for struct se_ua failed\n");
116 goto out_free_sess_cache;
118 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
119 sizeof(struct t10_pr_registration),
120 __alignof__(struct t10_pr_registration), 0, NULL);
121 if (!t10_pr_reg_cache) {
122 pr_err("kmem_cache_create() for struct t10_pr_registration"
124 goto out_free_ua_cache;
126 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
127 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
129 if (!t10_alua_lu_gp_cache) {
130 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
132 goto out_free_pr_reg_cache;
134 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
135 sizeof(struct t10_alua_lu_gp_member),
136 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
137 if (!t10_alua_lu_gp_mem_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
140 goto out_free_lu_gp_cache;
142 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
143 sizeof(struct t10_alua_tg_pt_gp),
144 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
145 if (!t10_alua_tg_pt_gp_cache) {
146 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
148 goto out_free_lu_gp_mem_cache;
150 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
151 "t10_alua_tg_pt_gp_mem_cache",
152 sizeof(struct t10_alua_tg_pt_gp_member),
153 __alignof__(struct t10_alua_tg_pt_gp_member),
155 if (!t10_alua_tg_pt_gp_mem_cache) {
156 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
158 goto out_free_tg_pt_gp_cache;
161 target_completion_wq = alloc_workqueue("target_completion",
163 if (!target_completion_wq)
164 goto out_free_tg_pt_gp_mem_cache;
168 out_free_tg_pt_gp_mem_cache:
169 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
170 out_free_tg_pt_gp_cache:
171 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
172 out_free_lu_gp_mem_cache:
173 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
174 out_free_lu_gp_cache:
175 kmem_cache_destroy(t10_alua_lu_gp_cache);
176 out_free_pr_reg_cache:
177 kmem_cache_destroy(t10_pr_reg_cache);
179 kmem_cache_destroy(se_ua_cache);
181 kmem_cache_destroy(se_sess_cache);
182 out_free_tmr_req_cache:
183 kmem_cache_destroy(se_tmr_req_cache);
185 kmem_cache_destroy(se_cmd_cache);
190 void release_se_kmem_caches(void)
192 destroy_workqueue(target_completion_wq);
193 kmem_cache_destroy(se_cmd_cache);
194 kmem_cache_destroy(se_tmr_req_cache);
195 kmem_cache_destroy(se_sess_cache);
196 kmem_cache_destroy(se_ua_cache);
197 kmem_cache_destroy(t10_pr_reg_cache);
198 kmem_cache_destroy(t10_alua_lu_gp_cache);
199 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
200 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
201 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
204 /* This code ensures unique mib indexes are handed out. */
205 static DEFINE_SPINLOCK(scsi_mib_index_lock);
206 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
209 * Allocate a new row index for the entry type specified
211 u32 scsi_get_new_index(scsi_index_t type)
215 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
217 spin_lock(&scsi_mib_index_lock);
218 new_index = ++scsi_mib_index[type];
219 spin_unlock(&scsi_mib_index_lock);
224 void transport_init_queue_obj(struct se_queue_obj *qobj)
226 atomic_set(&qobj->queue_cnt, 0);
227 INIT_LIST_HEAD(&qobj->qobj_list);
228 init_waitqueue_head(&qobj->thread_wq);
229 spin_lock_init(&qobj->cmd_queue_lock);
231 EXPORT_SYMBOL(transport_init_queue_obj);
233 void transport_subsystem_check_init(void)
237 if (sub_api_initialized)
240 ret = request_module("target_core_iblock");
242 pr_err("Unable to load target_core_iblock\n");
244 ret = request_module("target_core_file");
246 pr_err("Unable to load target_core_file\n");
248 ret = request_module("target_core_pscsi");
250 pr_err("Unable to load target_core_pscsi\n");
252 ret = request_module("target_core_stgt");
254 pr_err("Unable to load target_core_stgt\n");
256 sub_api_initialized = 1;
260 struct se_session *transport_init_session(void)
262 struct se_session *se_sess;
264 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
266 pr_err("Unable to allocate struct se_session from"
268 return ERR_PTR(-ENOMEM);
270 INIT_LIST_HEAD(&se_sess->sess_list);
271 INIT_LIST_HEAD(&se_sess->sess_acl_list);
272 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
273 INIT_LIST_HEAD(&se_sess->sess_wait_list);
274 spin_lock_init(&se_sess->sess_cmd_lock);
278 EXPORT_SYMBOL(transport_init_session);
281 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
283 void __transport_register_session(
284 struct se_portal_group *se_tpg,
285 struct se_node_acl *se_nacl,
286 struct se_session *se_sess,
287 void *fabric_sess_ptr)
289 unsigned char buf[PR_REG_ISID_LEN];
291 se_sess->se_tpg = se_tpg;
292 se_sess->fabric_sess_ptr = fabric_sess_ptr;
294 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
296 * Only set for struct se_session's that will actually be moving I/O.
297 * eg: *NOT* discovery sessions.
301 * If the fabric module supports an ISID based TransportID,
302 * save this value in binary from the fabric I_T Nexus now.
304 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
305 memset(&buf[0], 0, PR_REG_ISID_LEN);
306 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
307 &buf[0], PR_REG_ISID_LEN);
308 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
310 spin_lock_irq(&se_nacl->nacl_sess_lock);
312 * The se_nacl->nacl_sess pointer will be set to the
313 * last active I_T Nexus for each struct se_node_acl.
315 se_nacl->nacl_sess = se_sess;
317 list_add_tail(&se_sess->sess_acl_list,
318 &se_nacl->acl_sess_list);
319 spin_unlock_irq(&se_nacl->nacl_sess_lock);
321 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
323 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
324 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
326 EXPORT_SYMBOL(__transport_register_session);
328 void transport_register_session(
329 struct se_portal_group *se_tpg,
330 struct se_node_acl *se_nacl,
331 struct se_session *se_sess,
332 void *fabric_sess_ptr)
334 spin_lock_bh(&se_tpg->session_lock);
335 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
336 spin_unlock_bh(&se_tpg->session_lock);
338 EXPORT_SYMBOL(transport_register_session);
340 void transport_deregister_session_configfs(struct se_session *se_sess)
342 struct se_node_acl *se_nacl;
345 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
347 se_nacl = se_sess->se_node_acl;
349 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
350 list_del(&se_sess->sess_acl_list);
352 * If the session list is empty, then clear the pointer.
353 * Otherwise, set the struct se_session pointer from the tail
354 * element of the per struct se_node_acl active session list.
356 if (list_empty(&se_nacl->acl_sess_list))
357 se_nacl->nacl_sess = NULL;
359 se_nacl->nacl_sess = container_of(
360 se_nacl->acl_sess_list.prev,
361 struct se_session, sess_acl_list);
363 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
366 EXPORT_SYMBOL(transport_deregister_session_configfs);
368 void transport_free_session(struct se_session *se_sess)
370 kmem_cache_free(se_sess_cache, se_sess);
372 EXPORT_SYMBOL(transport_free_session);
374 void transport_deregister_session(struct se_session *se_sess)
376 struct se_portal_group *se_tpg = se_sess->se_tpg;
377 struct se_node_acl *se_nacl;
381 transport_free_session(se_sess);
385 spin_lock_irqsave(&se_tpg->session_lock, flags);
386 list_del(&se_sess->sess_list);
387 se_sess->se_tpg = NULL;
388 se_sess->fabric_sess_ptr = NULL;
389 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
392 * Determine if we need to do extra work for this initiator node's
393 * struct se_node_acl if it had been previously dynamically generated.
395 se_nacl = se_sess->se_node_acl;
397 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
398 if (se_nacl->dynamic_node_acl) {
399 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
401 list_del(&se_nacl->acl_list);
402 se_tpg->num_node_acls--;
403 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
405 core_tpg_wait_for_nacl_pr_ref(se_nacl);
406 core_free_device_list_for_node(se_nacl, se_tpg);
407 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
409 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
412 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
415 transport_free_session(se_sess);
417 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
418 se_tpg->se_tpg_tfo->get_fabric_name());
420 EXPORT_SYMBOL(transport_deregister_session);
423 * Called with cmd->t_state_lock held.
425 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
427 struct se_device *dev = cmd->se_dev;
428 struct se_task *task;
434 list_for_each_entry(task, &cmd->t_task_list, t_list) {
435 if (task->task_flags & TF_ACTIVE)
438 if (!atomic_read(&task->task_state_active))
441 spin_lock_irqsave(&dev->execute_task_lock, flags);
442 list_del(&task->t_state_list);
443 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
444 cmd->se_tfo->get_task_tag(cmd), dev, task);
445 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
447 atomic_set(&task->task_state_active, 0);
448 atomic_dec(&cmd->t_task_cdbs_ex_left);
452 /* transport_cmd_check_stop():
454 * 'transport_off = 1' determines if t_transport_active should be cleared.
455 * 'transport_off = 2' determines if task_dev_state should be removed.
457 * A non-zero u8 t_state sets cmd->t_state.
458 * Returns 1 when command is stopped, else 0.
460 static int transport_cmd_check_stop(
467 spin_lock_irqsave(&cmd->t_state_lock, flags);
469 * Determine if IOCTL context caller in requesting the stopping of this
470 * command for LUN shutdown purposes.
472 if (atomic_read(&cmd->transport_lun_stop)) {
473 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
474 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
475 cmd->se_tfo->get_task_tag(cmd));
477 atomic_set(&cmd->t_transport_active, 0);
478 if (transport_off == 2)
479 transport_all_task_dev_remove_state(cmd);
480 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
482 complete(&cmd->transport_lun_stop_comp);
486 * Determine if frontend context caller is requesting the stopping of
487 * this command for frontend exceptions.
489 if (atomic_read(&cmd->t_transport_stop)) {
490 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
491 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
492 cmd->se_tfo->get_task_tag(cmd));
494 if (transport_off == 2)
495 transport_all_task_dev_remove_state(cmd);
498 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
501 if (transport_off == 2)
503 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
505 complete(&cmd->t_transport_stop_comp);
509 atomic_set(&cmd->t_transport_active, 0);
510 if (transport_off == 2) {
511 transport_all_task_dev_remove_state(cmd);
513 * Clear struct se_cmd->se_lun before the transport_off == 2
514 * handoff to fabric module.
518 * Some fabric modules like tcm_loop can release
519 * their internally allocated I/O reference now and
522 * Fabric modules are expected to return '1' here if the
523 * se_cmd being passed is released at this point,
524 * or zero if not being released.
526 if (cmd->se_tfo->check_stop_free != NULL) {
527 spin_unlock_irqrestore(
528 &cmd->t_state_lock, flags);
530 return cmd->se_tfo->check_stop_free(cmd);
533 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
537 cmd->t_state = t_state;
538 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
543 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
545 return transport_cmd_check_stop(cmd, 2, 0);
548 static void transport_lun_remove_cmd(struct se_cmd *cmd)
550 struct se_lun *lun = cmd->se_lun;
556 spin_lock_irqsave(&cmd->t_state_lock, flags);
557 if (!atomic_read(&cmd->transport_dev_active)) {
558 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
561 atomic_set(&cmd->transport_dev_active, 0);
562 transport_all_task_dev_remove_state(cmd);
563 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
567 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
568 if (atomic_read(&cmd->transport_lun_active)) {
569 list_del(&cmd->se_lun_node);
570 atomic_set(&cmd->transport_lun_active, 0);
572 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
573 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
576 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
579 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
581 if (!cmd->se_tmr_req)
582 transport_lun_remove_cmd(cmd);
584 if (transport_cmd_check_stop_to_fabric(cmd))
587 transport_remove_cmd_from_queue(cmd);
588 transport_put_cmd(cmd);
592 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
595 struct se_device *dev = cmd->se_dev;
596 struct se_queue_obj *qobj = &dev->dev_queue_obj;
600 spin_lock_irqsave(&cmd->t_state_lock, flags);
601 cmd->t_state = t_state;
602 atomic_set(&cmd->t_transport_active, 1);
603 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
606 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
608 /* If the cmd is already on the list, remove it before we add it */
609 if (!list_empty(&cmd->se_queue_node))
610 list_del(&cmd->se_queue_node);
612 atomic_inc(&qobj->queue_cnt);
615 list_add(&cmd->se_queue_node, &qobj->qobj_list);
617 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
618 atomic_set(&cmd->t_transport_queue_active, 1);
619 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
621 wake_up_interruptible(&qobj->thread_wq);
624 static struct se_cmd *
625 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
630 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
631 if (list_empty(&qobj->qobj_list)) {
632 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
635 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
637 atomic_set(&cmd->t_transport_queue_active, 0);
639 list_del_init(&cmd->se_queue_node);
640 atomic_dec(&qobj->queue_cnt);
641 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
648 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
651 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
652 if (!atomic_read(&cmd->t_transport_queue_active)) {
653 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
656 atomic_set(&cmd->t_transport_queue_active, 0);
657 atomic_dec(&qobj->queue_cnt);
658 list_del_init(&cmd->se_queue_node);
659 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
661 if (atomic_read(&cmd->t_transport_queue_active)) {
662 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
663 cmd->se_tfo->get_task_tag(cmd),
664 atomic_read(&cmd->t_transport_queue_active));
669 * Completion function used by TCM subsystem plugins (such as FILEIO)
670 * for queueing up response from struct se_subsystem_api->do_task()
672 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
674 struct se_task *task = list_entry(cmd->t_task_list.next,
675 struct se_task, t_list);
678 cmd->scsi_status = SAM_STAT_GOOD;
679 task->task_scsi_status = GOOD;
681 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
682 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
683 task->task_se_cmd->transport_error_status =
684 PYX_TRANSPORT_ILLEGAL_REQUEST;
687 transport_complete_task(task, good);
689 EXPORT_SYMBOL(transport_complete_sync_cache);
691 static void target_complete_failure_work(struct work_struct *work)
693 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
695 transport_generic_request_failure(cmd, 1, 1);
698 /* transport_complete_task():
700 * Called from interrupt and non interrupt context depending
701 * on the transport plugin.
703 void transport_complete_task(struct se_task *task, int success)
705 struct se_cmd *cmd = task->task_se_cmd;
706 struct se_device *dev = cmd->se_dev;
709 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
710 cmd->t_task_cdb[0], dev);
713 atomic_inc(&dev->depth_left);
715 spin_lock_irqsave(&cmd->t_state_lock, flags);
716 task->task_flags &= ~TF_ACTIVE;
719 * See if any sense data exists, if so set the TASK_SENSE flag.
720 * Also check for any other post completion work that needs to be
721 * done by the plugins.
723 if (dev && dev->transport->transport_complete) {
724 if (dev->transport->transport_complete(task) != 0) {
725 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
726 task->task_sense = 1;
732 * See if we are waiting for outstanding struct se_task
733 * to complete for an exception condition
735 if (task->task_flags & TF_REQUEST_STOP) {
736 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
737 complete(&task->task_stop_comp);
742 cmd->t_tasks_failed = 1;
745 * Decrement the outstanding t_task_cdbs_left count. The last
746 * struct se_task from struct se_cmd will complete itself into the
747 * device queue depending upon int success.
749 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
750 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
754 if (cmd->t_tasks_failed) {
755 if (!task->task_error_status) {
756 task->task_error_status =
757 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
758 cmd->transport_error_status =
759 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
761 INIT_WORK(&cmd->work, target_complete_failure_work);
763 atomic_set(&cmd->t_transport_complete, 1);
764 INIT_WORK(&cmd->work, target_complete_ok_work);
767 cmd->t_state = TRANSPORT_COMPLETE;
768 atomic_set(&cmd->t_transport_active, 1);
769 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
771 queue_work(target_completion_wq, &cmd->work);
773 EXPORT_SYMBOL(transport_complete_task);
776 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
777 * struct se_task list are ready to be added to the active execution list
780 * Called with se_dev_t->execute_task_lock called.
782 static inline int transport_add_task_check_sam_attr(
783 struct se_task *task,
784 struct se_task *task_prev,
785 struct se_device *dev)
788 * No SAM Task attribute emulation enabled, add to tail of
791 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
792 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
796 * HEAD_OF_QUEUE attribute for received CDB, which means
797 * the first task that is associated with a struct se_cmd goes to
798 * head of the struct se_device->execute_task_list, and task_prev
799 * after that for each subsequent task
801 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
802 list_add(&task->t_execute_list,
803 (task_prev != NULL) ?
804 &task_prev->t_execute_list :
805 &dev->execute_task_list);
807 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
808 " in execution queue\n",
809 task->task_se_cmd->t_task_cdb[0]);
813 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
814 * transitioned from Dermant -> Active state, and are added to the end
815 * of the struct se_device->execute_task_list
817 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
821 /* __transport_add_task_to_execute_queue():
823 * Called with se_dev_t->execute_task_lock called.
825 static void __transport_add_task_to_execute_queue(
826 struct se_task *task,
827 struct se_task *task_prev,
828 struct se_device *dev)
832 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
833 atomic_inc(&dev->execute_tasks);
835 if (atomic_read(&task->task_state_active))
838 * Determine if this task needs to go to HEAD_OF_QUEUE for the
839 * state list as well. Running with SAM Task Attribute emulation
840 * will always return head_of_queue == 0 here
843 list_add(&task->t_state_list, (task_prev) ?
844 &task_prev->t_state_list :
845 &dev->state_task_list);
847 list_add_tail(&task->t_state_list, &dev->state_task_list);
849 atomic_set(&task->task_state_active, 1);
851 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
852 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
856 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
858 struct se_device *dev = cmd->se_dev;
859 struct se_task *task;
862 spin_lock_irqsave(&cmd->t_state_lock, flags);
863 list_for_each_entry(task, &cmd->t_task_list, t_list) {
864 if (atomic_read(&task->task_state_active))
867 spin_lock(&dev->execute_task_lock);
868 list_add_tail(&task->t_state_list, &dev->state_task_list);
869 atomic_set(&task->task_state_active, 1);
871 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
872 task->task_se_cmd->se_tfo->get_task_tag(
873 task->task_se_cmd), task, dev);
875 spin_unlock(&dev->execute_task_lock);
877 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
880 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
882 struct se_device *dev = cmd->se_dev;
883 struct se_task *task, *task_prev = NULL;
886 spin_lock_irqsave(&dev->execute_task_lock, flags);
887 list_for_each_entry(task, &cmd->t_task_list, t_list) {
888 if (!list_empty(&task->t_execute_list))
891 * __transport_add_task_to_execute_queue() handles the
892 * SAM Task Attribute emulation if enabled
894 __transport_add_task_to_execute_queue(task, task_prev, dev);
897 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
900 void __transport_remove_task_from_execute_queue(struct se_task *task,
901 struct se_device *dev)
903 list_del_init(&task->t_execute_list);
904 atomic_dec(&dev->execute_tasks);
907 void transport_remove_task_from_execute_queue(
908 struct se_task *task,
909 struct se_device *dev)
913 if (WARN_ON(list_empty(&task->t_execute_list)))
916 spin_lock_irqsave(&dev->execute_task_lock, flags);
917 __transport_remove_task_from_execute_queue(task, dev);
918 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
922 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
925 static void target_qf_do_work(struct work_struct *work)
927 struct se_device *dev = container_of(work, struct se_device,
929 LIST_HEAD(qf_cmd_list);
930 struct se_cmd *cmd, *cmd_tmp;
932 spin_lock_irq(&dev->qf_cmd_lock);
933 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
934 spin_unlock_irq(&dev->qf_cmd_lock);
936 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
937 list_del(&cmd->se_qf_node);
938 atomic_dec(&dev->dev_qf_count);
939 smp_mb__after_atomic_dec();
941 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
942 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
943 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
944 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
947 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
951 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
953 switch (cmd->data_direction) {
956 case DMA_FROM_DEVICE:
960 case DMA_BIDIRECTIONAL:
969 void transport_dump_dev_state(
970 struct se_device *dev,
974 *bl += sprintf(b + *bl, "Status: ");
975 switch (dev->dev_status) {
976 case TRANSPORT_DEVICE_ACTIVATED:
977 *bl += sprintf(b + *bl, "ACTIVATED");
979 case TRANSPORT_DEVICE_DEACTIVATED:
980 *bl += sprintf(b + *bl, "DEACTIVATED");
982 case TRANSPORT_DEVICE_SHUTDOWN:
983 *bl += sprintf(b + *bl, "SHUTDOWN");
985 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
986 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
987 *bl += sprintf(b + *bl, "OFFLINE");
990 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
994 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
995 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
997 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
998 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
999 *bl += sprintf(b + *bl, " ");
1002 void transport_dump_vpd_proto_id(
1003 struct t10_vpd *vpd,
1004 unsigned char *p_buf,
1007 unsigned char buf[VPD_TMP_BUF_SIZE];
1010 memset(buf, 0, VPD_TMP_BUF_SIZE);
1011 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1013 switch (vpd->protocol_identifier) {
1015 sprintf(buf+len, "Fibre Channel\n");
1018 sprintf(buf+len, "Parallel SCSI\n");
1021 sprintf(buf+len, "SSA\n");
1024 sprintf(buf+len, "IEEE 1394\n");
1027 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1031 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1034 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1037 sprintf(buf+len, "Automation/Drive Interface Transport"
1041 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1044 sprintf(buf+len, "Unknown 0x%02x\n",
1045 vpd->protocol_identifier);
1050 strncpy(p_buf, buf, p_buf_len);
1052 pr_debug("%s", buf);
1056 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1059 * Check if the Protocol Identifier Valid (PIV) bit is set..
1061 * from spc3r23.pdf section 7.5.1
1063 if (page_83[1] & 0x80) {
1064 vpd->protocol_identifier = (page_83[0] & 0xf0);
1065 vpd->protocol_identifier_set = 1;
1066 transport_dump_vpd_proto_id(vpd, NULL, 0);
1069 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1071 int transport_dump_vpd_assoc(
1072 struct t10_vpd *vpd,
1073 unsigned char *p_buf,
1076 unsigned char buf[VPD_TMP_BUF_SIZE];
1080 memset(buf, 0, VPD_TMP_BUF_SIZE);
1081 len = sprintf(buf, "T10 VPD Identifier Association: ");
1083 switch (vpd->association) {
1085 sprintf(buf+len, "addressed logical unit\n");
1088 sprintf(buf+len, "target port\n");
1091 sprintf(buf+len, "SCSI target device\n");
1094 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1100 strncpy(p_buf, buf, p_buf_len);
1102 pr_debug("%s", buf);
1107 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1110 * The VPD identification association..
1112 * from spc3r23.pdf Section 7.6.3.1 Table 297
1114 vpd->association = (page_83[1] & 0x30);
1115 return transport_dump_vpd_assoc(vpd, NULL, 0);
1117 EXPORT_SYMBOL(transport_set_vpd_assoc);
1119 int transport_dump_vpd_ident_type(
1120 struct t10_vpd *vpd,
1121 unsigned char *p_buf,
1124 unsigned char buf[VPD_TMP_BUF_SIZE];
1128 memset(buf, 0, VPD_TMP_BUF_SIZE);
1129 len = sprintf(buf, "T10 VPD Identifier Type: ");
1131 switch (vpd->device_identifier_type) {
1133 sprintf(buf+len, "Vendor specific\n");
1136 sprintf(buf+len, "T10 Vendor ID based\n");
1139 sprintf(buf+len, "EUI-64 based\n");
1142 sprintf(buf+len, "NAA\n");
1145 sprintf(buf+len, "Relative target port identifier\n");
1148 sprintf(buf+len, "SCSI name string\n");
1151 sprintf(buf+len, "Unsupported: 0x%02x\n",
1152 vpd->device_identifier_type);
1158 if (p_buf_len < strlen(buf)+1)
1160 strncpy(p_buf, buf, p_buf_len);
1162 pr_debug("%s", buf);
1168 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1171 * The VPD identifier type..
1173 * from spc3r23.pdf Section 7.6.3.1 Table 298
1175 vpd->device_identifier_type = (page_83[1] & 0x0f);
1176 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1178 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1180 int transport_dump_vpd_ident(
1181 struct t10_vpd *vpd,
1182 unsigned char *p_buf,
1185 unsigned char buf[VPD_TMP_BUF_SIZE];
1188 memset(buf, 0, VPD_TMP_BUF_SIZE);
1190 switch (vpd->device_identifier_code_set) {
1191 case 0x01: /* Binary */
1192 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1193 &vpd->device_identifier[0]);
1195 case 0x02: /* ASCII */
1196 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1197 &vpd->device_identifier[0]);
1199 case 0x03: /* UTF-8 */
1200 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1201 &vpd->device_identifier[0]);
1204 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1205 " 0x%02x", vpd->device_identifier_code_set);
1211 strncpy(p_buf, buf, p_buf_len);
1213 pr_debug("%s", buf);
1219 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1221 static const char hex_str[] = "0123456789abcdef";
1222 int j = 0, i = 4; /* offset to start of the identifer */
1225 * The VPD Code Set (encoding)
1227 * from spc3r23.pdf Section 7.6.3.1 Table 296
1229 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1230 switch (vpd->device_identifier_code_set) {
1231 case 0x01: /* Binary */
1232 vpd->device_identifier[j++] =
1233 hex_str[vpd->device_identifier_type];
1234 while (i < (4 + page_83[3])) {
1235 vpd->device_identifier[j++] =
1236 hex_str[(page_83[i] & 0xf0) >> 4];
1237 vpd->device_identifier[j++] =
1238 hex_str[page_83[i] & 0x0f];
1242 case 0x02: /* ASCII */
1243 case 0x03: /* UTF-8 */
1244 while (i < (4 + page_83[3]))
1245 vpd->device_identifier[j++] = page_83[i++];
1251 return transport_dump_vpd_ident(vpd, NULL, 0);
1253 EXPORT_SYMBOL(transport_set_vpd_ident);
1255 static void core_setup_task_attr_emulation(struct se_device *dev)
1258 * If this device is from Target_Core_Mod/pSCSI, disable the
1259 * SAM Task Attribute emulation.
1261 * This is currently not available in upsream Linux/SCSI Target
1262 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1264 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1265 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1269 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1270 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1271 " device\n", dev->transport->name,
1272 dev->transport->get_device_rev(dev));
1275 static void scsi_dump_inquiry(struct se_device *dev)
1277 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1280 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1282 pr_debug(" Vendor: ");
1283 for (i = 0; i < 8; i++)
1284 if (wwn->vendor[i] >= 0x20)
1285 pr_debug("%c", wwn->vendor[i]);
1289 pr_debug(" Model: ");
1290 for (i = 0; i < 16; i++)
1291 if (wwn->model[i] >= 0x20)
1292 pr_debug("%c", wwn->model[i]);
1296 pr_debug(" Revision: ");
1297 for (i = 0; i < 4; i++)
1298 if (wwn->revision[i] >= 0x20)
1299 pr_debug("%c", wwn->revision[i]);
1305 device_type = dev->transport->get_device_type(dev);
1306 pr_debug(" Type: %s ", scsi_device_type(device_type));
1307 pr_debug(" ANSI SCSI revision: %02x\n",
1308 dev->transport->get_device_rev(dev));
1311 struct se_device *transport_add_device_to_core_hba(
1313 struct se_subsystem_api *transport,
1314 struct se_subsystem_dev *se_dev,
1316 void *transport_dev,
1317 struct se_dev_limits *dev_limits,
1318 const char *inquiry_prod,
1319 const char *inquiry_rev)
1322 struct se_device *dev;
1324 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1326 pr_err("Unable to allocate memory for se_dev_t\n");
1330 transport_init_queue_obj(&dev->dev_queue_obj);
1331 dev->dev_flags = device_flags;
1332 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1333 dev->dev_ptr = transport_dev;
1335 dev->se_sub_dev = se_dev;
1336 dev->transport = transport;
1337 atomic_set(&dev->active_cmds, 0);
1338 INIT_LIST_HEAD(&dev->dev_list);
1339 INIT_LIST_HEAD(&dev->dev_sep_list);
1340 INIT_LIST_HEAD(&dev->dev_tmr_list);
1341 INIT_LIST_HEAD(&dev->execute_task_list);
1342 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1343 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1344 INIT_LIST_HEAD(&dev->state_task_list);
1345 INIT_LIST_HEAD(&dev->qf_cmd_list);
1346 spin_lock_init(&dev->execute_task_lock);
1347 spin_lock_init(&dev->delayed_cmd_lock);
1348 spin_lock_init(&dev->ordered_cmd_lock);
1349 spin_lock_init(&dev->state_task_lock);
1350 spin_lock_init(&dev->dev_alua_lock);
1351 spin_lock_init(&dev->dev_reservation_lock);
1352 spin_lock_init(&dev->dev_status_lock);
1353 spin_lock_init(&dev->dev_status_thr_lock);
1354 spin_lock_init(&dev->se_port_lock);
1355 spin_lock_init(&dev->se_tmr_lock);
1356 spin_lock_init(&dev->qf_cmd_lock);
1358 dev->queue_depth = dev_limits->queue_depth;
1359 atomic_set(&dev->depth_left, dev->queue_depth);
1360 atomic_set(&dev->dev_ordered_id, 0);
1362 se_dev_set_default_attribs(dev, dev_limits);
1364 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1365 dev->creation_time = get_jiffies_64();
1366 spin_lock_init(&dev->stats_lock);
1368 spin_lock(&hba->device_lock);
1369 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1371 spin_unlock(&hba->device_lock);
1373 * Setup the SAM Task Attribute emulation for struct se_device
1375 core_setup_task_attr_emulation(dev);
1377 * Force PR and ALUA passthrough emulation with internal object use.
1379 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1381 * Setup the Reservations infrastructure for struct se_device
1383 core_setup_reservations(dev, force_pt);
1385 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1387 if (core_setup_alua(dev, force_pt) < 0)
1391 * Startup the struct se_device processing thread
1393 dev->process_thread = kthread_run(transport_processing_thread, dev,
1394 "LIO_%s", dev->transport->name);
1395 if (IS_ERR(dev->process_thread)) {
1396 pr_err("Unable to create kthread: LIO_%s\n",
1397 dev->transport->name);
1401 * Setup work_queue for QUEUE_FULL
1403 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1405 * Preload the initial INQUIRY const values if we are doing
1406 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1407 * passthrough because this is being provided by the backend LLD.
1408 * This is required so that transport_get_inquiry() copies these
1409 * originals once back into DEV_T10_WWN(dev) for the virtual device
1412 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1413 if (!inquiry_prod || !inquiry_rev) {
1414 pr_err("All non TCM/pSCSI plugins require"
1415 " INQUIRY consts\n");
1419 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1420 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1421 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1423 scsi_dump_inquiry(dev);
1427 kthread_stop(dev->process_thread);
1429 spin_lock(&hba->device_lock);
1430 list_del(&dev->dev_list);
1432 spin_unlock(&hba->device_lock);
1434 se_release_vpd_for_dev(dev);
1440 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1442 /* transport_generic_prepare_cdb():
1444 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1445 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1446 * The point of this is since we are mapping iSCSI LUNs to
1447 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1448 * devices and HBAs for a loop.
1450 static inline void transport_generic_prepare_cdb(
1454 case READ_10: /* SBC - RDProtect */
1455 case READ_12: /* SBC - RDProtect */
1456 case READ_16: /* SBC - RDProtect */
1457 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1458 case VERIFY: /* SBC - VRProtect */
1459 case VERIFY_16: /* SBC - VRProtect */
1460 case WRITE_VERIFY: /* SBC - VRProtect */
1461 case WRITE_VERIFY_12: /* SBC - VRProtect */
1464 cdb[1] &= 0x1f; /* clear logical unit number */
1469 static struct se_task *
1470 transport_generic_get_task(struct se_cmd *cmd,
1471 enum dma_data_direction data_direction)
1473 struct se_task *task;
1474 struct se_device *dev = cmd->se_dev;
1476 task = dev->transport->alloc_task(cmd->t_task_cdb);
1478 pr_err("Unable to allocate struct se_task\n");
1482 INIT_LIST_HEAD(&task->t_list);
1483 INIT_LIST_HEAD(&task->t_execute_list);
1484 INIT_LIST_HEAD(&task->t_state_list);
1485 init_completion(&task->task_stop_comp);
1486 task->task_se_cmd = cmd;
1487 task->task_data_direction = data_direction;
1492 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1495 * Used by fabric modules containing a local struct se_cmd within their
1496 * fabric dependent per I/O descriptor.
1498 void transport_init_se_cmd(
1500 struct target_core_fabric_ops *tfo,
1501 struct se_session *se_sess,
1505 unsigned char *sense_buffer)
1507 INIT_LIST_HEAD(&cmd->se_lun_node);
1508 INIT_LIST_HEAD(&cmd->se_delayed_node);
1509 INIT_LIST_HEAD(&cmd->se_ordered_node);
1510 INIT_LIST_HEAD(&cmd->se_qf_node);
1511 INIT_LIST_HEAD(&cmd->se_queue_node);
1512 INIT_LIST_HEAD(&cmd->se_cmd_list);
1513 INIT_LIST_HEAD(&cmd->t_task_list);
1514 init_completion(&cmd->transport_lun_fe_stop_comp);
1515 init_completion(&cmd->transport_lun_stop_comp);
1516 init_completion(&cmd->t_transport_stop_comp);
1517 init_completion(&cmd->cmd_wait_comp);
1518 spin_lock_init(&cmd->t_state_lock);
1519 atomic_set(&cmd->transport_dev_active, 1);
1522 cmd->se_sess = se_sess;
1523 cmd->data_length = data_length;
1524 cmd->data_direction = data_direction;
1525 cmd->sam_task_attr = task_attr;
1526 cmd->sense_buffer = sense_buffer;
1528 EXPORT_SYMBOL(transport_init_se_cmd);
1530 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1533 * Check if SAM Task Attribute emulation is enabled for this
1534 * struct se_device storage object
1536 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1539 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1540 pr_debug("SAM Task Attribute ACA"
1541 " emulation is not supported\n");
1545 * Used to determine when ORDERED commands should go from
1546 * Dormant to Active status.
1548 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1549 smp_mb__after_atomic_inc();
1550 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1551 cmd->se_ordered_id, cmd->sam_task_attr,
1552 cmd->se_dev->transport->name);
1556 /* transport_generic_allocate_tasks():
1558 * Called from fabric RX Thread.
1560 int transport_generic_allocate_tasks(
1566 transport_generic_prepare_cdb(cdb);
1568 * Ensure that the received CDB is less than the max (252 + 8) bytes
1569 * for VARIABLE_LENGTH_CMD
1571 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1572 pr_err("Received SCSI CDB with command_size: %d that"
1573 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1574 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1578 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1579 * allocate the additional extended CDB buffer now.. Otherwise
1580 * setup the pointer from __t_task_cdb to t_task_cdb.
1582 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1583 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1585 if (!cmd->t_task_cdb) {
1586 pr_err("Unable to allocate cmd->t_task_cdb"
1587 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1588 scsi_command_size(cdb),
1589 (unsigned long)sizeof(cmd->__t_task_cdb));
1593 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1595 * Copy the original CDB into cmd->
1597 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1599 * Setup the received CDB based on SCSI defined opcodes and
1600 * perform unit attention, persistent reservations and ALUA
1601 * checks for virtual device backends. The cmd->t_task_cdb
1602 * pointer is expected to be setup before we reach this point.
1604 ret = transport_generic_cmd_sequencer(cmd, cdb);
1608 * Check for SAM Task Attribute Emulation
1610 if (transport_check_alloc_task_attr(cmd) < 0) {
1611 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1612 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1615 spin_lock(&cmd->se_lun->lun_sep_lock);
1616 if (cmd->se_lun->lun_sep)
1617 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1618 spin_unlock(&cmd->se_lun->lun_sep_lock);
1621 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1624 * Used by fabric module frontends to queue tasks directly.
1625 * Many only be used from process context only
1627 int transport_handle_cdb_direct(
1634 pr_err("cmd->se_lun is NULL\n");
1637 if (in_interrupt()) {
1639 pr_err("transport_generic_handle_cdb cannot be called"
1640 " from interrupt context\n");
1644 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1645 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1646 * in existing usage to ensure that outstanding descriptors are handled
1647 * correctly during shutdown via transport_wait_for_tasks()
1649 * Also, we don't take cmd->t_state_lock here as we only expect
1650 * this to be called for initial descriptor submission.
1652 cmd->t_state = TRANSPORT_NEW_CMD;
1653 atomic_set(&cmd->t_transport_active, 1);
1655 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1656 * so follow TRANSPORT_NEW_CMD processing thread context usage
1657 * and call transport_generic_request_failure() if necessary..
1659 ret = transport_generic_new_cmd(cmd);
1661 cmd->transport_error_status = ret;
1662 transport_generic_request_failure(cmd, 0,
1663 (cmd->data_direction != DMA_TO_DEVICE));
1667 EXPORT_SYMBOL(transport_handle_cdb_direct);
1670 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1671 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1672 * complete setup in TCM process context w/ TFO->new_cmd_map().
1674 int transport_generic_handle_cdb_map(
1679 pr_err("cmd->se_lun is NULL\n");
1683 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1686 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1688 /* transport_generic_handle_data():
1692 int transport_generic_handle_data(
1696 * For the software fabric case, then we assume the nexus is being
1697 * failed/shutdown when signals are pending from the kthread context
1698 * caller, so we return a failure. For the HW target mode case running
1699 * in interrupt code, the signal_pending() check is skipped.
1701 if (!in_interrupt() && signal_pending(current))
1704 * If the received CDB has aleady been ABORTED by the generic
1705 * target engine, we now call transport_check_aborted_status()
1706 * to queue any delated TASK_ABORTED status for the received CDB to the
1707 * fabric module as we are expecting no further incoming DATA OUT
1708 * sequences at this point.
1710 if (transport_check_aborted_status(cmd, 1) != 0)
1713 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1716 EXPORT_SYMBOL(transport_generic_handle_data);
1718 /* transport_generic_handle_tmr():
1722 int transport_generic_handle_tmr(
1725 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1728 EXPORT_SYMBOL(transport_generic_handle_tmr);
1731 * If the task is active, request it to be stopped and sleep until it
1734 bool target_stop_task(struct se_task *task, unsigned long *flags)
1736 struct se_cmd *cmd = task->task_se_cmd;
1737 bool was_active = false;
1739 if (task->task_flags & TF_ACTIVE) {
1740 task->task_flags |= TF_REQUEST_STOP;
1741 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1743 pr_debug("Task %p waiting to complete\n", task);
1744 wait_for_completion(&task->task_stop_comp);
1745 pr_debug("Task %p stopped successfully\n", task);
1747 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1748 atomic_dec(&cmd->t_task_cdbs_left);
1749 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1756 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1758 struct se_task *task, *task_tmp;
1759 unsigned long flags;
1762 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1763 cmd->se_tfo->get_task_tag(cmd));
1766 * No tasks remain in the execution queue
1768 spin_lock_irqsave(&cmd->t_state_lock, flags);
1769 list_for_each_entry_safe(task, task_tmp,
1770 &cmd->t_task_list, t_list) {
1771 pr_debug("Processing task %p\n", task);
1773 * If the struct se_task has not been sent and is not active,
1774 * remove the struct se_task from the execution queue.
1776 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1777 spin_unlock_irqrestore(&cmd->t_state_lock,
1779 transport_remove_task_from_execute_queue(task,
1782 pr_debug("Task %p removed from execute queue\n", task);
1783 spin_lock_irqsave(&cmd->t_state_lock, flags);
1787 if (!target_stop_task(task, &flags)) {
1788 pr_debug("Task %p - did nothing\n", task);
1792 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1798 * Handle SAM-esque emulation for generic transport request failures.
1800 static void transport_generic_request_failure(
1807 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1808 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1809 cmd->t_task_cdb[0]);
1810 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
1811 cmd->se_tfo->get_cmd_state(cmd),
1813 cmd->transport_error_status);
1814 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1815 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1816 " t_transport_active: %d t_transport_stop: %d"
1817 " t_transport_sent: %d\n", cmd->t_task_list_num,
1818 atomic_read(&cmd->t_task_cdbs_left),
1819 atomic_read(&cmd->t_task_cdbs_sent),
1820 atomic_read(&cmd->t_task_cdbs_ex_left),
1821 atomic_read(&cmd->t_transport_active),
1822 atomic_read(&cmd->t_transport_stop),
1823 atomic_read(&cmd->t_transport_sent));
1826 * For SAM Task Attribute emulation for failed struct se_cmd
1828 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1829 transport_complete_task_attr(cmd);
1832 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1835 switch (cmd->transport_error_status) {
1836 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1837 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1839 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1840 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1842 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1843 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1845 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1846 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1848 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1850 transport_new_cmd_failure(cmd);
1852 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1853 * we force this session to fall back to session
1856 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1857 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1860 case PYX_TRANSPORT_LU_COMM_FAILURE:
1861 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1862 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1864 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1865 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1867 case PYX_TRANSPORT_WRITE_PROTECTED:
1868 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1870 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1872 * No SENSE Data payload for this case, set SCSI Status
1873 * and queue the response to $FABRIC_MOD.
1875 * Uses linux/include/scsi/scsi.h SAM status codes defs
1877 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1879 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1880 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1883 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1886 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1887 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1888 cmd->orig_fe_lun, 0x2C,
1889 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1891 ret = cmd->se_tfo->queue_status(cmd);
1892 if (ret == -EAGAIN || ret == -ENOMEM)
1895 case PYX_TRANSPORT_USE_SENSE_REASON:
1897 * struct se_cmd->scsi_sense_reason already set
1901 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1903 cmd->transport_error_status);
1904 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1908 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1909 * make the call to transport_send_check_condition_and_sense()
1910 * directly. Otherwise expect the fabric to make the call to
1911 * transport_send_check_condition_and_sense() after handling
1912 * possible unsoliticied write data payloads.
1914 if (!sc && !cmd->se_tfo->new_cmd_map)
1915 transport_new_cmd_failure(cmd);
1917 ret = transport_send_check_condition_and_sense(cmd,
1918 cmd->scsi_sense_reason, 0);
1919 if (ret == -EAGAIN || ret == -ENOMEM)
1924 transport_lun_remove_cmd(cmd);
1925 if (!transport_cmd_check_stop_to_fabric(cmd))
1930 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1931 transport_handle_queue_full(cmd, cmd->se_dev);
1934 static inline u32 transport_lba_21(unsigned char *cdb)
1936 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1939 static inline u32 transport_lba_32(unsigned char *cdb)
1941 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1944 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1946 unsigned int __v1, __v2;
1948 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1949 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1951 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1955 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1957 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1959 unsigned int __v1, __v2;
1961 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1962 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1964 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1967 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1969 unsigned long flags;
1971 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1972 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1973 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1976 static inline int transport_tcq_window_closed(struct se_device *dev)
1978 if (dev->dev_tcq_window_closed++ <
1979 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1980 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1982 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1984 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
1989 * Called from Fabric Module context from transport_execute_tasks()
1991 * The return of this function determins if the tasks from struct se_cmd
1992 * get added to the execution queue in transport_execute_tasks(),
1993 * or are added to the delayed or ordered lists here.
1995 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1997 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2000 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2001 * to allow the passed struct se_cmd list of tasks to the front of the list.
2003 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2004 atomic_inc(&cmd->se_dev->dev_hoq_count);
2005 smp_mb__after_atomic_inc();
2006 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2007 " 0x%02x, se_ordered_id: %u\n",
2009 cmd->se_ordered_id);
2011 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2012 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2013 list_add_tail(&cmd->se_ordered_node,
2014 &cmd->se_dev->ordered_cmd_list);
2015 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2017 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2018 smp_mb__after_atomic_inc();
2020 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2021 " list, se_ordered_id: %u\n",
2023 cmd->se_ordered_id);
2025 * Add ORDERED command to tail of execution queue if
2026 * no other older commands exist that need to be
2029 if (!atomic_read(&cmd->se_dev->simple_cmds))
2033 * For SIMPLE and UNTAGGED Task Attribute commands
2035 atomic_inc(&cmd->se_dev->simple_cmds);
2036 smp_mb__after_atomic_inc();
2039 * Otherwise if one or more outstanding ORDERED task attribute exist,
2040 * add the dormant task(s) built for the passed struct se_cmd to the
2041 * execution queue and become in Active state for this struct se_device.
2043 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2045 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2046 * will be drained upon completion of HEAD_OF_QUEUE task.
2048 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2049 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2050 list_add_tail(&cmd->se_delayed_node,
2051 &cmd->se_dev->delayed_cmd_list);
2052 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2054 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2055 " delayed CMD list, se_ordered_id: %u\n",
2056 cmd->t_task_cdb[0], cmd->sam_task_attr,
2057 cmd->se_ordered_id);
2059 * Return zero to let transport_execute_tasks() know
2060 * not to add the delayed tasks to the execution list.
2065 * Otherwise, no ORDERED task attributes exist..
2071 * Called from fabric module context in transport_generic_new_cmd() and
2072 * transport_generic_process_write()
2074 static int transport_execute_tasks(struct se_cmd *cmd)
2078 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2079 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2080 transport_generic_request_failure(cmd, 0, 1);
2085 * Call transport_cmd_check_stop() to see if a fabric exception
2086 * has occurred that prevents execution.
2088 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2090 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2091 * attribute for the tasks of the received struct se_cmd CDB
2093 add_tasks = transport_execute_task_attr(cmd);
2097 * This calls transport_add_tasks_from_cmd() to handle
2098 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2099 * (if enabled) in __transport_add_task_to_execute_queue() and
2100 * transport_add_task_check_sam_attr().
2102 transport_add_tasks_from_cmd(cmd);
2105 * Kick the execution queue for the cmd associated struct se_device
2109 __transport_execute_tasks(cmd->se_dev);
2114 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2115 * from struct se_device->execute_task_list and
2117 * Called from transport_processing_thread()
2119 static int __transport_execute_tasks(struct se_device *dev)
2122 struct se_cmd *cmd = NULL;
2123 struct se_task *task = NULL;
2124 unsigned long flags;
2127 * Check if there is enough room in the device and HBA queue to send
2128 * struct se_tasks to the selected transport.
2131 if (!atomic_read(&dev->depth_left))
2132 return transport_tcq_window_closed(dev);
2134 dev->dev_tcq_window_closed = 0;
2136 spin_lock_irq(&dev->execute_task_lock);
2137 if (list_empty(&dev->execute_task_list)) {
2138 spin_unlock_irq(&dev->execute_task_lock);
2141 task = list_first_entry(&dev->execute_task_list,
2142 struct se_task, t_execute_list);
2143 __transport_remove_task_from_execute_queue(task, dev);
2144 spin_unlock_irq(&dev->execute_task_lock);
2146 atomic_dec(&dev->depth_left);
2148 cmd = task->task_se_cmd;
2150 spin_lock_irqsave(&cmd->t_state_lock, flags);
2151 task->task_flags |= (TF_ACTIVE | TF_SENT);
2152 atomic_inc(&cmd->t_task_cdbs_sent);
2154 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2155 cmd->t_task_list_num)
2156 atomic_set(&cmd->t_transport_sent, 1);
2158 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2160 if (cmd->execute_task)
2161 error = cmd->execute_task(task);
2163 error = dev->transport->do_task(task);
2165 cmd->transport_error_status = error;
2166 spin_lock_irqsave(&cmd->t_state_lock, flags);
2167 task->task_flags &= ~TF_ACTIVE;
2168 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2169 atomic_set(&cmd->t_transport_sent, 0);
2170 transport_stop_tasks_for_cmd(cmd);
2171 atomic_inc(&dev->depth_left);
2172 transport_generic_request_failure(cmd, 0, 1);
2180 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2182 unsigned long flags;
2184 * Any unsolicited data will get dumped for failed command inside of
2187 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2188 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2189 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2190 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2193 static inline u32 transport_get_sectors_6(
2198 struct se_device *dev = cmd->se_dev;
2201 * Assume TYPE_DISK for non struct se_device objects.
2202 * Use 8-bit sector value.
2208 * Use 24-bit allocation length for TYPE_TAPE.
2210 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2211 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2214 * Everything else assume TYPE_DISK Sector CDB location.
2215 * Use 8-bit sector value.
2221 static inline u32 transport_get_sectors_10(
2226 struct se_device *dev = cmd->se_dev;
2229 * Assume TYPE_DISK for non struct se_device objects.
2230 * Use 16-bit sector value.
2236 * XXX_10 is not defined in SSC, throw an exception
2238 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2244 * Everything else assume TYPE_DISK Sector CDB location.
2245 * Use 16-bit sector value.
2248 return (u32)(cdb[7] << 8) + cdb[8];
2251 static inline u32 transport_get_sectors_12(
2256 struct se_device *dev = cmd->se_dev;
2259 * Assume TYPE_DISK for non struct se_device objects.
2260 * Use 32-bit sector value.
2266 * XXX_12 is not defined in SSC, throw an exception
2268 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2274 * Everything else assume TYPE_DISK Sector CDB location.
2275 * Use 32-bit sector value.
2278 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2281 static inline u32 transport_get_sectors_16(
2286 struct se_device *dev = cmd->se_dev;
2289 * Assume TYPE_DISK for non struct se_device objects.
2290 * Use 32-bit sector value.
2296 * Use 24-bit allocation length for TYPE_TAPE.
2298 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2299 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2302 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2303 (cdb[12] << 8) + cdb[13];
2307 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2309 static inline u32 transport_get_sectors_32(
2315 * Assume TYPE_DISK for non struct se_device objects.
2316 * Use 32-bit sector value.
2318 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2319 (cdb[30] << 8) + cdb[31];
2323 static inline u32 transport_get_size(
2328 struct se_device *dev = cmd->se_dev;
2330 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2331 if (cdb[1] & 1) { /* sectors */
2332 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2337 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2338 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2339 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2340 dev->transport->name);
2342 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2345 static void transport_xor_callback(struct se_cmd *cmd)
2347 unsigned char *buf, *addr;
2348 struct scatterlist *sg;
2349 unsigned int offset;
2353 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2355 * 1) read the specified logical block(s);
2356 * 2) transfer logical blocks from the data-out buffer;
2357 * 3) XOR the logical blocks transferred from the data-out buffer with
2358 * the logical blocks read, storing the resulting XOR data in a buffer;
2359 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2360 * blocks transferred from the data-out buffer; and
2361 * 5) transfer the resulting XOR data to the data-in buffer.
2363 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2365 pr_err("Unable to allocate xor_callback buf\n");
2369 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2370 * into the locally allocated *buf
2372 sg_copy_to_buffer(cmd->t_data_sg,
2378 * Now perform the XOR against the BIDI read memory located at
2379 * cmd->t_mem_bidi_list
2383 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2384 addr = kmap_atomic(sg_page(sg), KM_USER0);
2388 for (i = 0; i < sg->length; i++)
2389 *(addr + sg->offset + i) ^= *(buf + offset + i);
2391 offset += sg->length;
2392 kunmap_atomic(addr, KM_USER0);
2400 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2402 static int transport_get_sense_data(struct se_cmd *cmd)
2404 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2405 struct se_device *dev = cmd->se_dev;
2406 struct se_task *task = NULL, *task_tmp;
2407 unsigned long flags;
2410 WARN_ON(!cmd->se_lun);
2415 spin_lock_irqsave(&cmd->t_state_lock, flags);
2416 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2417 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2421 list_for_each_entry_safe(task, task_tmp,
2422 &cmd->t_task_list, t_list) {
2423 if (!task->task_sense)
2426 if (!dev->transport->get_sense_buffer) {
2427 pr_err("dev->transport->get_sense_buffer"
2432 sense_buffer = dev->transport->get_sense_buffer(task);
2433 if (!sense_buffer) {
2434 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2435 " sense buffer for task with sense\n",
2436 cmd->se_tfo->get_task_tag(cmd), task);
2439 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2441 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2442 TRANSPORT_SENSE_BUFFER);
2444 memcpy(&buffer[offset], sense_buffer,
2445 TRANSPORT_SENSE_BUFFER);
2446 cmd->scsi_status = task->task_scsi_status;
2447 /* Automatically padded */
2448 cmd->scsi_sense_length =
2449 (TRANSPORT_SENSE_BUFFER + offset);
2451 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2453 dev->se_hba->hba_id, dev->transport->name,
2457 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2463 transport_handle_reservation_conflict(struct se_cmd *cmd)
2465 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2466 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2467 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2469 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2470 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2473 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2476 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2477 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2478 cmd->orig_fe_lun, 0x2C,
2479 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2483 static inline long long transport_dev_end_lba(struct se_device *dev)
2485 return dev->transport->get_blocks(dev) + 1;
2488 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2490 struct se_device *dev = cmd->se_dev;
2493 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2496 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2498 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2499 pr_err("LBA: %llu Sectors: %u exceeds"
2500 " transport_dev_end_lba(): %llu\n",
2501 cmd->t_task_lba, sectors,
2502 transport_dev_end_lba(dev));
2509 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2512 * Determine if the received WRITE_SAME is used to for direct
2513 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2514 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2515 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2517 int passthrough = (dev->transport->transport_type ==
2518 TRANSPORT_PLUGIN_PHBA_PDEV);
2521 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2522 pr_err("WRITE_SAME PBDATA and LBDATA"
2523 " bits not supported for Block Discard"
2528 * Currently for the emulated case we only accept
2529 * tpws with the UNMAP=1 bit set.
2531 if (!(flags[0] & 0x08)) {
2532 pr_err("WRITE_SAME w/o UNMAP bit not"
2533 " supported for Block Discard Emulation\n");
2541 /* transport_generic_cmd_sequencer():
2543 * Generic Command Sequencer that should work for most DAS transport
2546 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2549 * FIXME: Need to support other SCSI OPCODES where as well.
2551 static int transport_generic_cmd_sequencer(
2555 struct se_device *dev = cmd->se_dev;
2556 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2557 int ret = 0, sector_ret = 0, passthrough;
2558 u32 sectors = 0, size = 0, pr_reg_type = 0;
2562 * Check for an existing UNIT ATTENTION condition
2564 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2565 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2566 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2570 * Check status of Asymmetric Logical Unit Assignment port
2572 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2575 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2576 * The ALUA additional sense code qualifier (ASCQ) is determined
2577 * by the ALUA primary or secondary access state..
2581 pr_debug("[%s]: ALUA TG Port not available,"
2582 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2583 cmd->se_tfo->get_fabric_name(), alua_ascq);
2585 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2586 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2587 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2590 goto out_invalid_cdb_field;
2593 * Check status for SPC-3 Persistent Reservations
2595 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2596 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2597 cmd, cdb, pr_reg_type) != 0)
2598 return transport_handle_reservation_conflict(cmd);
2600 * This means the CDB is allowed for the SCSI Initiator port
2601 * when said port is *NOT* holding the legacy SPC-2 or
2602 * SPC-3 Persistent Reservation.
2607 * If we operate in passthrough mode we skip most CDB emulation and
2608 * instead hand the commands down to the physical SCSI device.
2611 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2615 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2617 goto out_unsupported_cdb;
2618 size = transport_get_size(sectors, cdb, cmd);
2619 cmd->t_task_lba = transport_lba_21(cdb);
2620 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2623 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2625 goto out_unsupported_cdb;
2626 size = transport_get_size(sectors, cdb, cmd);
2627 cmd->t_task_lba = transport_lba_32(cdb);
2628 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2631 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2633 goto out_unsupported_cdb;
2634 size = transport_get_size(sectors, cdb, cmd);
2635 cmd->t_task_lba = transport_lba_32(cdb);
2636 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2639 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2641 goto out_unsupported_cdb;
2642 size = transport_get_size(sectors, cdb, cmd);
2643 cmd->t_task_lba = transport_lba_64(cdb);
2644 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2647 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2649 goto out_unsupported_cdb;
2650 size = transport_get_size(sectors, cdb, cmd);
2651 cmd->t_task_lba = transport_lba_21(cdb);
2652 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2655 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2657 goto out_unsupported_cdb;
2658 size = transport_get_size(sectors, cdb, cmd);
2659 cmd->t_task_lba = transport_lba_32(cdb);
2660 cmd->t_tasks_fua = (cdb[1] & 0x8);
2661 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2664 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2666 goto out_unsupported_cdb;
2667 size = transport_get_size(sectors, cdb, cmd);
2668 cmd->t_task_lba = transport_lba_32(cdb);
2669 cmd->t_tasks_fua = (cdb[1] & 0x8);
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->t_tasks_fua = (cdb[1] & 0x8);
2679 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2681 case XDWRITEREAD_10:
2682 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2683 !(cmd->t_tasks_bidi))
2684 goto out_invalid_cdb_field;
2685 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2687 goto out_unsupported_cdb;
2688 size = transport_get_size(sectors, cdb, cmd);
2689 cmd->t_task_lba = transport_lba_32(cdb);
2690 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2693 * Do now allow BIDI commands for passthrough mode.
2696 goto out_unsupported_cdb;
2699 * Setup BIDI XOR callback to be run after I/O completion.
2701 cmd->transport_complete_callback = &transport_xor_callback;
2702 cmd->t_tasks_fua = (cdb[1] & 0x8);
2704 case VARIABLE_LENGTH_CMD:
2705 service_action = get_unaligned_be16(&cdb[8]);
2706 switch (service_action) {
2707 case XDWRITEREAD_32:
2708 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2710 goto out_unsupported_cdb;
2711 size = transport_get_size(sectors, cdb, cmd);
2713 * Use WRITE_32 and READ_32 opcodes for the emulated
2714 * XDWRITE_READ_32 logic.
2716 cmd->t_task_lba = transport_lba_64_ext(cdb);
2717 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2720 * Do now allow BIDI commands for passthrough mode.
2723 goto out_unsupported_cdb;
2726 * Setup BIDI XOR callback to be run during after I/O
2729 cmd->transport_complete_callback = &transport_xor_callback;
2730 cmd->t_tasks_fua = (cdb[10] & 0x8);
2733 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2735 goto out_unsupported_cdb;
2738 size = transport_get_size(1, cdb, cmd);
2740 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2742 goto out_invalid_cdb_field;
2745 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2746 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2748 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2749 goto out_invalid_cdb_field;
2751 cmd->execute_task = target_emulate_write_same;
2754 pr_err("VARIABLE_LENGTH_CMD service action"
2755 " 0x%04x not supported\n", service_action);
2756 goto out_unsupported_cdb;
2759 case MAINTENANCE_IN:
2760 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2761 /* MAINTENANCE_IN from SCC-2 */
2763 * Check for emulated MI_REPORT_TARGET_PGS.
2765 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2766 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2768 target_emulate_report_target_port_groups;
2770 size = (cdb[6] << 24) | (cdb[7] << 16) |
2771 (cdb[8] << 8) | cdb[9];
2773 /* GPCMD_SEND_KEY from multi media commands */
2774 size = (cdb[8] << 8) + cdb[9];
2776 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2780 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2782 case MODE_SELECT_10:
2783 size = (cdb[7] << 8) + cdb[8];
2784 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2788 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2790 cmd->execute_task = target_emulate_modesense;
2793 size = (cdb[7] << 8) + cdb[8];
2794 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2796 cmd->execute_task = target_emulate_modesense;
2798 case GPCMD_READ_BUFFER_CAPACITY:
2799 case GPCMD_SEND_OPC:
2802 size = (cdb[7] << 8) + cdb[8];
2803 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2805 case READ_BLOCK_LIMITS:
2806 size = READ_BLOCK_LEN;
2807 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2809 case GPCMD_GET_CONFIGURATION:
2810 case GPCMD_READ_FORMAT_CAPACITIES:
2811 case GPCMD_READ_DISC_INFO:
2812 case GPCMD_READ_TRACK_RZONE_INFO:
2813 size = (cdb[7] << 8) + cdb[8];
2814 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2816 case PERSISTENT_RESERVE_IN:
2817 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2818 cmd->execute_task = target_scsi3_emulate_pr_in;
2819 size = (cdb[7] << 8) + cdb[8];
2820 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2822 case PERSISTENT_RESERVE_OUT:
2823 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2824 cmd->execute_task = target_scsi3_emulate_pr_out;
2825 size = (cdb[7] << 8) + cdb[8];
2826 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2828 case GPCMD_MECHANISM_STATUS:
2829 case GPCMD_READ_DVD_STRUCTURE:
2830 size = (cdb[8] << 8) + cdb[9];
2831 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2834 size = READ_POSITION_LEN;
2835 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2837 case MAINTENANCE_OUT:
2838 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2839 /* MAINTENANCE_OUT from SCC-2
2841 * Check for emulated MO_SET_TARGET_PGS.
2843 if (cdb[1] == MO_SET_TARGET_PGS &&
2844 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2846 target_emulate_set_target_port_groups;
2849 size = (cdb[6] << 24) | (cdb[7] << 16) |
2850 (cdb[8] << 8) | cdb[9];
2852 /* GPCMD_REPORT_KEY from multi media commands */
2853 size = (cdb[8] << 8) + cdb[9];
2855 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2858 size = (cdb[3] << 8) + cdb[4];
2860 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2861 * See spc4r17 section 5.3
2863 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2864 cmd->sam_task_attr = MSG_HEAD_TAG;
2865 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2867 cmd->execute_task = target_emulate_inquiry;
2870 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2871 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2874 size = READ_CAP_LEN;
2875 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2877 cmd->execute_task = target_emulate_readcapacity;
2879 case READ_MEDIA_SERIAL_NUMBER:
2880 case SECURITY_PROTOCOL_IN:
2881 case SECURITY_PROTOCOL_OUT:
2882 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2883 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2885 case SERVICE_ACTION_IN:
2886 switch (cmd->t_task_cdb[1] & 0x1f) {
2887 case SAI_READ_CAPACITY_16:
2890 target_emulate_readcapacity_16;
2896 pr_err("Unsupported SA: 0x%02x\n",
2897 cmd->t_task_cdb[1] & 0x1f);
2898 goto out_unsupported_cdb;
2901 case ACCESS_CONTROL_IN:
2902 case ACCESS_CONTROL_OUT:
2904 case READ_ATTRIBUTE:
2905 case RECEIVE_COPY_RESULTS:
2906 case WRITE_ATTRIBUTE:
2907 size = (cdb[10] << 24) | (cdb[11] << 16) |
2908 (cdb[12] << 8) | cdb[13];
2909 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2911 case RECEIVE_DIAGNOSTIC:
2912 case SEND_DIAGNOSTIC:
2913 size = (cdb[3] << 8) | cdb[4];
2914 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2916 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2919 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2920 size = (2336 * sectors);
2921 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2926 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2930 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2932 cmd->execute_task = target_emulate_request_sense;
2934 case READ_ELEMENT_STATUS:
2935 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2936 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2939 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2940 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2945 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2946 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2948 if (cdb[0] == RESERVE_10)
2949 size = (cdb[7] << 8) | cdb[8];
2951 size = cmd->data_length;
2954 * Setup the legacy emulated handler for SPC-2 and
2955 * >= SPC-3 compatible reservation handling (CRH=1)
2956 * Otherwise, we assume the underlying SCSI logic is
2957 * is running in SPC_PASSTHROUGH, and wants reservations
2958 * emulation disabled.
2960 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2961 cmd->execute_task = target_scsi2_reservation_reserve;
2962 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2967 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2968 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2970 if (cdb[0] == RELEASE_10)
2971 size = (cdb[7] << 8) | cdb[8];
2973 size = cmd->data_length;
2975 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2976 cmd->execute_task = target_scsi2_reservation_release;
2977 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2979 case SYNCHRONIZE_CACHE:
2980 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2982 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2984 if (cdb[0] == SYNCHRONIZE_CACHE) {
2985 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2986 cmd->t_task_lba = transport_lba_32(cdb);
2988 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2989 cmd->t_task_lba = transport_lba_64(cdb);
2992 goto out_unsupported_cdb;
2994 size = transport_get_size(sectors, cdb, cmd);
2995 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3001 * Check to ensure that LBA + Range does not exceed past end of
3002 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3004 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3005 if (transport_cmd_get_valid_sectors(cmd) < 0)
3006 goto out_invalid_cdb_field;
3008 cmd->execute_task = target_emulate_synchronize_cache;
3011 size = get_unaligned_be16(&cdb[7]);
3012 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3014 cmd->execute_task = target_emulate_unmap;
3017 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3019 goto out_unsupported_cdb;
3022 size = transport_get_size(1, cdb, cmd);
3024 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3025 goto out_invalid_cdb_field;
3028 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3029 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3031 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3032 goto out_invalid_cdb_field;
3034 cmd->execute_task = target_emulate_write_same;
3037 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3039 goto out_unsupported_cdb;
3042 size = transport_get_size(1, cdb, cmd);
3044 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3045 goto out_invalid_cdb_field;
3048 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3049 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3051 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3052 * of byte 1 bit 3 UNMAP instead of original reserved field
3054 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3055 goto out_invalid_cdb_field;
3057 cmd->execute_task = target_emulate_write_same;
3059 case ALLOW_MEDIUM_REMOVAL:
3065 case TEST_UNIT_READY:
3067 case WRITE_FILEMARKS:
3068 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3070 cmd->execute_task = target_emulate_noop;
3072 case GPCMD_CLOSE_TRACK:
3073 case INITIALIZE_ELEMENT_STATUS:
3074 case GPCMD_LOAD_UNLOAD:
3075 case GPCMD_SET_SPEED:
3077 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3080 cmd->execute_task = target_report_luns;
3081 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3083 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3084 * See spc4r17 section 5.3
3086 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3087 cmd->sam_task_attr = MSG_HEAD_TAG;
3088 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3091 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3092 " 0x%02x, sending CHECK_CONDITION.\n",
3093 cmd->se_tfo->get_fabric_name(), cdb[0]);
3094 goto out_unsupported_cdb;
3097 if (size != cmd->data_length) {
3098 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3099 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3100 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3101 cmd->data_length, size, cdb[0]);
3103 cmd->cmd_spdtl = size;
3105 if (cmd->data_direction == DMA_TO_DEVICE) {
3106 pr_err("Rejecting underflow/overflow"
3108 goto out_invalid_cdb_field;
3111 * Reject READ_* or WRITE_* with overflow/underflow for
3112 * type SCF_SCSI_DATA_SG_IO_CDB.
3114 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3115 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3116 " CDB on non 512-byte sector setup subsystem"
3117 " plugin: %s\n", dev->transport->name);
3118 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3119 goto out_invalid_cdb_field;
3122 if (size > cmd->data_length) {
3123 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3124 cmd->residual_count = (size - cmd->data_length);
3126 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3127 cmd->residual_count = (cmd->data_length - size);
3129 cmd->data_length = size;
3132 /* reject any command that we don't have a handler for */
3133 if (!(passthrough || cmd->execute_task ||
3134 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3135 goto out_unsupported_cdb;
3137 /* Let's limit control cdbs to a page, for simplicity's sake. */
3138 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3140 goto out_invalid_cdb_field;
3142 transport_set_supported_SAM_opcode(cmd);
3145 out_unsupported_cdb:
3146 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3147 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3149 out_invalid_cdb_field:
3150 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3151 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3156 * Called from I/O completion to determine which dormant/delayed
3157 * and ordered cmds need to have their tasks added to the execution queue.
3159 static void transport_complete_task_attr(struct se_cmd *cmd)
3161 struct se_device *dev = cmd->se_dev;
3162 struct se_cmd *cmd_p, *cmd_tmp;
3163 int new_active_tasks = 0;
3165 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3166 atomic_dec(&dev->simple_cmds);
3167 smp_mb__after_atomic_dec();
3168 dev->dev_cur_ordered_id++;
3169 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3170 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3171 cmd->se_ordered_id);
3172 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3173 atomic_dec(&dev->dev_hoq_count);
3174 smp_mb__after_atomic_dec();
3175 dev->dev_cur_ordered_id++;
3176 pr_debug("Incremented dev_cur_ordered_id: %u for"
3177 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3178 cmd->se_ordered_id);
3179 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3180 spin_lock(&dev->ordered_cmd_lock);
3181 list_del(&cmd->se_ordered_node);
3182 atomic_dec(&dev->dev_ordered_sync);
3183 smp_mb__after_atomic_dec();
3184 spin_unlock(&dev->ordered_cmd_lock);
3186 dev->dev_cur_ordered_id++;
3187 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3188 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3191 * Process all commands up to the last received
3192 * ORDERED task attribute which requires another blocking
3195 spin_lock(&dev->delayed_cmd_lock);
3196 list_for_each_entry_safe(cmd_p, cmd_tmp,
3197 &dev->delayed_cmd_list, se_delayed_node) {
3199 list_del(&cmd_p->se_delayed_node);
3200 spin_unlock(&dev->delayed_cmd_lock);
3202 pr_debug("Calling add_tasks() for"
3203 " cmd_p: 0x%02x Task Attr: 0x%02x"
3204 " Dormant -> Active, se_ordered_id: %u\n",
3205 cmd_p->t_task_cdb[0],
3206 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3208 transport_add_tasks_from_cmd(cmd_p);
3211 spin_lock(&dev->delayed_cmd_lock);
3212 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3215 spin_unlock(&dev->delayed_cmd_lock);
3217 * If new tasks have become active, wake up the transport thread
3218 * to do the processing of the Active tasks.
3220 if (new_active_tasks != 0)
3221 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3224 static void transport_complete_qf(struct se_cmd *cmd)
3228 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3229 transport_complete_task_attr(cmd);
3231 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3232 ret = cmd->se_tfo->queue_status(cmd);
3237 switch (cmd->data_direction) {
3238 case DMA_FROM_DEVICE:
3239 ret = cmd->se_tfo->queue_data_in(cmd);
3242 if (cmd->t_bidi_data_sg) {
3243 ret = cmd->se_tfo->queue_data_in(cmd);
3247 /* Fall through for DMA_TO_DEVICE */
3249 ret = cmd->se_tfo->queue_status(cmd);
3257 transport_handle_queue_full(cmd, cmd->se_dev);
3260 transport_lun_remove_cmd(cmd);
3261 transport_cmd_check_stop_to_fabric(cmd);
3264 static void transport_handle_queue_full(
3266 struct se_device *dev)
3268 spin_lock_irq(&dev->qf_cmd_lock);
3269 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3270 atomic_inc(&dev->dev_qf_count);
3271 smp_mb__after_atomic_inc();
3272 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3274 schedule_work(&cmd->se_dev->qf_work_queue);
3277 static void target_complete_ok_work(struct work_struct *work)
3279 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3280 int reason = 0, ret;
3283 * Check if we need to move delayed/dormant tasks from cmds on the
3284 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3287 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3288 transport_complete_task_attr(cmd);
3290 * Check to schedule QUEUE_FULL work, or execute an existing
3291 * cmd->transport_qf_callback()
3293 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3294 schedule_work(&cmd->se_dev->qf_work_queue);
3297 * Check if we need to retrieve a sense buffer from
3298 * the struct se_cmd in question.
3300 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3301 if (transport_get_sense_data(cmd) < 0)
3302 reason = TCM_NON_EXISTENT_LUN;
3305 * Only set when an struct se_task->task_scsi_status returned
3306 * a non GOOD status.
3308 if (cmd->scsi_status) {
3309 ret = transport_send_check_condition_and_sense(
3311 if (ret == -EAGAIN || ret == -ENOMEM)
3314 transport_lun_remove_cmd(cmd);
3315 transport_cmd_check_stop_to_fabric(cmd);
3320 * Check for a callback, used by amongst other things
3321 * XDWRITE_READ_10 emulation.
3323 if (cmd->transport_complete_callback)
3324 cmd->transport_complete_callback(cmd);
3326 switch (cmd->data_direction) {
3327 case DMA_FROM_DEVICE:
3328 spin_lock(&cmd->se_lun->lun_sep_lock);
3329 if (cmd->se_lun->lun_sep) {
3330 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3333 spin_unlock(&cmd->se_lun->lun_sep_lock);
3335 ret = cmd->se_tfo->queue_data_in(cmd);
3336 if (ret == -EAGAIN || ret == -ENOMEM)
3340 spin_lock(&cmd->se_lun->lun_sep_lock);
3341 if (cmd->se_lun->lun_sep) {
3342 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3345 spin_unlock(&cmd->se_lun->lun_sep_lock);
3347 * Check if we need to send READ payload for BIDI-COMMAND
3349 if (cmd->t_bidi_data_sg) {
3350 spin_lock(&cmd->se_lun->lun_sep_lock);
3351 if (cmd->se_lun->lun_sep) {
3352 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3355 spin_unlock(&cmd->se_lun->lun_sep_lock);
3356 ret = cmd->se_tfo->queue_data_in(cmd);
3357 if (ret == -EAGAIN || ret == -ENOMEM)
3361 /* Fall through for DMA_TO_DEVICE */
3363 ret = cmd->se_tfo->queue_status(cmd);
3364 if (ret == -EAGAIN || ret == -ENOMEM)
3371 transport_lun_remove_cmd(cmd);
3372 transport_cmd_check_stop_to_fabric(cmd);
3376 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3377 " data_direction: %d\n", cmd, cmd->data_direction);
3378 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3379 transport_handle_queue_full(cmd, cmd->se_dev);
3382 static void transport_free_dev_tasks(struct se_cmd *cmd)
3384 struct se_task *task, *task_tmp;
3385 unsigned long flags;
3386 LIST_HEAD(dispose_list);
3388 spin_lock_irqsave(&cmd->t_state_lock, flags);
3389 list_for_each_entry_safe(task, task_tmp,
3390 &cmd->t_task_list, t_list) {
3391 if (!(task->task_flags & TF_ACTIVE))
3392 list_move_tail(&task->t_list, &dispose_list);
3394 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3396 while (!list_empty(&dispose_list)) {
3397 task = list_first_entry(&dispose_list, struct se_task, t_list);
3399 if (task->task_sg != cmd->t_data_sg &&
3400 task->task_sg != cmd->t_bidi_data_sg)
3401 kfree(task->task_sg);
3403 list_del(&task->t_list);
3405 cmd->se_dev->transport->free_task(task);
3409 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3411 struct scatterlist *sg;
3414 for_each_sg(sgl, sg, nents, count)
3415 __free_page(sg_page(sg));
3420 static inline void transport_free_pages(struct se_cmd *cmd)
3422 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3425 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3426 cmd->t_data_sg = NULL;
3427 cmd->t_data_nents = 0;
3429 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3430 cmd->t_bidi_data_sg = NULL;
3431 cmd->t_bidi_data_nents = 0;
3435 * transport_put_cmd - release a reference to a command
3436 * @cmd: command to release
3438 * This routine releases our reference to the command and frees it if possible.
3440 static void transport_put_cmd(struct se_cmd *cmd)
3442 unsigned long flags;
3445 spin_lock_irqsave(&cmd->t_state_lock, flags);
3446 if (atomic_read(&cmd->t_fe_count)) {
3447 if (!atomic_dec_and_test(&cmd->t_fe_count))
3451 if (atomic_read(&cmd->t_se_count)) {
3452 if (!atomic_dec_and_test(&cmd->t_se_count))
3456 if (atomic_read(&cmd->transport_dev_active)) {
3457 atomic_set(&cmd->transport_dev_active, 0);
3458 transport_all_task_dev_remove_state(cmd);
3461 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3463 if (free_tasks != 0)
3464 transport_free_dev_tasks(cmd);
3466 transport_free_pages(cmd);
3467 transport_release_cmd(cmd);
3470 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3474 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3475 * allocating in the core.
3476 * @cmd: Associated se_cmd descriptor
3477 * @mem: SGL style memory for TCM WRITE / READ
3478 * @sg_mem_num: Number of SGL elements
3479 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3480 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3482 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3485 int transport_generic_map_mem_to_cmd(
3487 struct scatterlist *sgl,
3489 struct scatterlist *sgl_bidi,
3492 if (!sgl || !sgl_count)
3495 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3496 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3498 cmd->t_data_sg = sgl;
3499 cmd->t_data_nents = sgl_count;
3501 if (sgl_bidi && sgl_bidi_count) {
3502 cmd->t_bidi_data_sg = sgl_bidi;
3503 cmd->t_bidi_data_nents = sgl_bidi_count;
3505 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3510 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3512 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3514 struct scatterlist *sg = cmd->t_data_sg;
3518 * We need to take into account a possible offset here for fabrics like
3519 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3520 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3522 return kmap(sg_page(sg)) + sg->offset;
3524 EXPORT_SYMBOL(transport_kmap_first_data_page);
3526 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3528 kunmap(sg_page(cmd->t_data_sg));
3530 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3533 transport_generic_get_mem(struct se_cmd *cmd)
3535 u32 length = cmd->data_length;
3540 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3541 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3542 if (!cmd->t_data_sg)
3545 cmd->t_data_nents = nents;
3546 sg_init_table(cmd->t_data_sg, nents);
3549 u32 page_len = min_t(u32, length, PAGE_SIZE);
3550 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3554 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3562 __free_page(sg_page(&cmd->t_data_sg[i]));
3565 kfree(cmd->t_data_sg);
3566 cmd->t_data_sg = NULL;
3570 /* Reduce sectors if they are too long for the device */
3571 static inline sector_t transport_limit_task_sectors(
3572 struct se_device *dev,
3573 unsigned long long lba,
3576 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3578 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3579 if ((lba + sectors) > transport_dev_end_lba(dev))
3580 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3587 * This function can be used by HW target mode drivers to create a linked
3588 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3589 * This is intended to be called during the completion path by TCM Core
3590 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3592 void transport_do_task_sg_chain(struct se_cmd *cmd)
3594 struct scatterlist *sg_first = NULL;
3595 struct scatterlist *sg_prev = NULL;
3596 int sg_prev_nents = 0;
3597 struct scatterlist *sg;
3598 struct se_task *task;
3599 u32 chained_nents = 0;
3602 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3605 * Walk the struct se_task list and setup scatterlist chains
3606 * for each contiguously allocated struct se_task->task_sg[].
3608 list_for_each_entry(task, &cmd->t_task_list, t_list) {
3613 sg_first = task->task_sg;
3614 chained_nents = task->task_sg_nents;
3616 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3617 chained_nents += task->task_sg_nents;
3620 * For the padded tasks, use the extra SGL vector allocated
3621 * in transport_allocate_data_tasks() for the sg_prev_nents
3622 * offset into sg_chain() above.
3624 * We do not need the padding for the last task (or a single
3625 * task), but in that case we will never use the sg_prev_nents
3626 * value below which would be incorrect.
3628 sg_prev_nents = (task->task_sg_nents + 1);
3629 sg_prev = task->task_sg;
3632 * Setup the starting pointer and total t_tasks_sg_linked_no including
3633 * padding SGs for linking and to mark the end.
3635 cmd->t_tasks_sg_chained = sg_first;
3636 cmd->t_tasks_sg_chained_no = chained_nents;
3638 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3639 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3640 cmd->t_tasks_sg_chained_no);
3642 for_each_sg(cmd->t_tasks_sg_chained, sg,
3643 cmd->t_tasks_sg_chained_no, i) {
3645 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3646 i, sg, sg_page(sg), sg->length, sg->offset);
3647 if (sg_is_chain(sg))
3648 pr_debug("SG: %p sg_is_chain=1\n", sg);
3650 pr_debug("SG: %p sg_is_last=1\n", sg);
3653 EXPORT_SYMBOL(transport_do_task_sg_chain);
3656 * Break up cmd into chunks transport can handle
3659 transport_allocate_data_tasks(struct se_cmd *cmd,
3660 enum dma_data_direction data_direction,
3661 struct scatterlist *cmd_sg, unsigned int sgl_nents)
3663 struct se_device *dev = cmd->se_dev;
3665 unsigned long long lba;
3666 sector_t sectors, dev_max_sectors;
3669 if (transport_cmd_get_valid_sectors(cmd) < 0)
3672 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3673 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3675 WARN_ON(cmd->data_length % sector_size);
3677 lba = cmd->t_task_lba;
3678 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3679 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3682 * If we need just a single task reuse the SG list in the command
3683 * and avoid a lot of work.
3685 if (task_count == 1) {
3686 struct se_task *task;
3687 unsigned long flags;
3689 task = transport_generic_get_task(cmd, data_direction);
3693 task->task_sg = cmd_sg;
3694 task->task_sg_nents = sgl_nents;
3696 task->task_lba = lba;
3697 task->task_sectors = sectors;
3698 task->task_size = task->task_sectors * sector_size;
3700 spin_lock_irqsave(&cmd->t_state_lock, flags);
3701 list_add_tail(&task->t_list, &cmd->t_task_list);
3702 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3707 for (i = 0; i < task_count; i++) {
3708 struct se_task *task;
3709 unsigned int task_size, task_sg_nents_padded;
3710 struct scatterlist *sg;
3711 unsigned long flags;
3714 task = transport_generic_get_task(cmd, data_direction);
3718 task->task_lba = lba;
3719 task->task_sectors = min(sectors, dev_max_sectors);
3720 task->task_size = task->task_sectors * sector_size;
3723 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3724 * in order to calculate the number per task SGL entries
3726 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3728 * Check if the fabric module driver is requesting that all
3729 * struct se_task->task_sg[] be chained together.. If so,
3730 * then allocate an extra padding SG entry for linking and
3731 * marking the end of the chained SGL for every task except
3732 * the last one for (task_count > 1) operation, or skipping
3733 * the extra padding for the (task_count == 1) case.
3735 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3736 task_sg_nents_padded = (task->task_sg_nents + 1);
3738 task_sg_nents_padded = task->task_sg_nents;
3740 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3741 task_sg_nents_padded, GFP_KERNEL);
3742 if (!task->task_sg) {
3743 cmd->se_dev->transport->free_task(task);
3747 sg_init_table(task->task_sg, task_sg_nents_padded);
3749 task_size = task->task_size;
3751 /* Build new sgl, only up to task_size */
3752 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3753 if (cmd_sg->length > task_size)
3757 task_size -= cmd_sg->length;
3758 cmd_sg = sg_next(cmd_sg);
3761 lba += task->task_sectors;
3762 sectors -= task->task_sectors;
3764 spin_lock_irqsave(&cmd->t_state_lock, flags);
3765 list_add_tail(&task->t_list, &cmd->t_task_list);
3766 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3773 transport_allocate_control_task(struct se_cmd *cmd)
3775 struct se_task *task;
3776 unsigned long flags;
3778 task = transport_generic_get_task(cmd, cmd->data_direction);
3782 task->task_sg = cmd->t_data_sg;
3783 task->task_size = cmd->data_length;
3784 task->task_sg_nents = cmd->t_data_nents;
3786 spin_lock_irqsave(&cmd->t_state_lock, flags);
3787 list_add_tail(&task->t_list, &cmd->t_task_list);
3788 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3790 /* Success! Return number of tasks allocated */
3795 * Allocate any required ressources to execute the command, and either place
3796 * it on the execution queue if possible. For writes we might not have the
3797 * payload yet, thus notify the fabric via a call to ->write_pending instead.
3799 int transport_generic_new_cmd(struct se_cmd *cmd)
3801 struct se_device *dev = cmd->se_dev;
3802 int task_cdbs, task_cdbs_bidi = 0;
3807 * Determine is the TCM fabric module has already allocated physical
3808 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3811 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3813 ret = transport_generic_get_mem(cmd);
3819 * For BIDI command set up the read tasks first.
3821 if (cmd->t_bidi_data_sg &&
3822 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3823 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3825 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3826 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3827 cmd->t_bidi_data_nents);
3828 if (task_cdbs_bidi <= 0)
3831 atomic_inc(&cmd->t_fe_count);
3832 atomic_inc(&cmd->t_se_count);
3836 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3837 task_cdbs = transport_allocate_data_tasks(cmd,
3838 cmd->data_direction, cmd->t_data_sg,
3841 task_cdbs = transport_allocate_control_task(cmd);
3848 atomic_inc(&cmd->t_fe_count);
3849 atomic_inc(&cmd->t_se_count);
3852 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3853 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3854 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3857 * For WRITEs, let the fabric know its buffer is ready..
3858 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3859 * will be added to the struct se_device execution queue after its WRITE
3860 * data has arrived. (ie: It gets handled by the transport processing
3861 * thread a second time)
3863 if (cmd->data_direction == DMA_TO_DEVICE) {
3864 transport_add_tasks_to_state_queue(cmd);
3865 return transport_generic_write_pending(cmd);
3868 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3869 * to the execution queue.
3871 transport_execute_tasks(cmd);
3875 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3876 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3879 EXPORT_SYMBOL(transport_generic_new_cmd);
3881 /* transport_generic_process_write():
3885 void transport_generic_process_write(struct se_cmd *cmd)
3887 transport_execute_tasks(cmd);
3889 EXPORT_SYMBOL(transport_generic_process_write);
3891 static void transport_write_pending_qf(struct se_cmd *cmd)
3895 ret = cmd->se_tfo->write_pending(cmd);
3896 if (ret == -EAGAIN || ret == -ENOMEM) {
3897 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3899 transport_handle_queue_full(cmd, cmd->se_dev);
3903 static int transport_generic_write_pending(struct se_cmd *cmd)
3905 unsigned long flags;
3908 spin_lock_irqsave(&cmd->t_state_lock, flags);
3909 cmd->t_state = TRANSPORT_WRITE_PENDING;
3910 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3913 * Clear the se_cmd for WRITE_PENDING status in order to set
3914 * cmd->t_transport_active=0 so that transport_generic_handle_data
3915 * can be called from HW target mode interrupt code. This is safe
3916 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3917 * because the se_cmd->se_lun pointer is not being cleared.
3919 transport_cmd_check_stop(cmd, 1, 0);
3922 * Call the fabric write_pending function here to let the
3923 * frontend know that WRITE buffers are ready.
3925 ret = cmd->se_tfo->write_pending(cmd);
3926 if (ret == -EAGAIN || ret == -ENOMEM)
3931 return PYX_TRANSPORT_WRITE_PENDING;
3934 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3935 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3936 transport_handle_queue_full(cmd, cmd->se_dev);
3941 * transport_release_cmd - free a command
3942 * @cmd: command to free
3944 * This routine unconditionally frees a command, and reference counting
3945 * or list removal must be done in the caller.
3947 void transport_release_cmd(struct se_cmd *cmd)
3949 BUG_ON(!cmd->se_tfo);
3951 if (cmd->se_tmr_req)
3952 core_tmr_release_req(cmd->se_tmr_req);
3953 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3954 kfree(cmd->t_task_cdb);
3956 * Check if target_wait_for_sess_cmds() is expecting to
3957 * release se_cmd directly here..
3959 if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3960 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3963 cmd->se_tfo->release_cmd(cmd);
3965 EXPORT_SYMBOL(transport_release_cmd);
3967 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3969 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3970 if (wait_for_tasks && cmd->se_tmr_req)
3971 transport_wait_for_tasks(cmd);
3973 transport_release_cmd(cmd);
3976 transport_wait_for_tasks(cmd);
3978 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3981 transport_lun_remove_cmd(cmd);
3983 transport_free_dev_tasks(cmd);
3985 transport_put_cmd(cmd);
3988 EXPORT_SYMBOL(transport_generic_free_cmd);
3990 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3991 * @se_sess: session to reference
3992 * @se_cmd: command descriptor to add
3994 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3996 unsigned long flags;
3998 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3999 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4000 se_cmd->check_release = 1;
4001 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4003 EXPORT_SYMBOL(target_get_sess_cmd);
4005 /* target_put_sess_cmd - Check for active I/O shutdown or list delete
4006 * @se_sess: session to reference
4007 * @se_cmd: command descriptor to drop
4009 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4011 unsigned long flags;
4013 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4014 if (list_empty(&se_cmd->se_cmd_list)) {
4015 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4020 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4021 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4022 complete(&se_cmd->cmd_wait_comp);
4025 list_del(&se_cmd->se_cmd_list);
4026 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4030 EXPORT_SYMBOL(target_put_sess_cmd);
4032 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4033 * @se_sess: session to split
4035 void target_splice_sess_cmd_list(struct se_session *se_sess)
4037 struct se_cmd *se_cmd;
4038 unsigned long flags;
4040 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4041 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4043 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4044 se_sess->sess_tearing_down = 1;
4046 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4048 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4049 se_cmd->cmd_wait_set = 1;
4051 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4053 EXPORT_SYMBOL(target_splice_sess_cmd_list);
4055 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4056 * @se_sess: session to wait for active I/O
4057 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4059 void target_wait_for_sess_cmds(
4060 struct se_session *se_sess,
4063 struct se_cmd *se_cmd, *tmp_cmd;
4066 list_for_each_entry_safe(se_cmd, tmp_cmd,
4067 &se_sess->sess_wait_list, se_cmd_list) {
4068 list_del(&se_cmd->se_cmd_list);
4070 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4071 " %d\n", se_cmd, se_cmd->t_state,
4072 se_cmd->se_tfo->get_cmd_state(se_cmd));
4074 if (wait_for_tasks) {
4075 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4076 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4077 se_cmd->se_tfo->get_cmd_state(se_cmd));
4079 rc = transport_wait_for_tasks(se_cmd);
4081 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4082 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4083 se_cmd->se_tfo->get_cmd_state(se_cmd));
4087 wait_for_completion(&se_cmd->cmd_wait_comp);
4088 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4089 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4090 se_cmd->se_tfo->get_cmd_state(se_cmd));
4093 se_cmd->se_tfo->release_cmd(se_cmd);
4096 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4098 /* transport_lun_wait_for_tasks():
4100 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4101 * an struct se_lun to be successfully shutdown.
4103 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4105 unsigned long flags;
4108 * If the frontend has already requested this struct se_cmd to
4109 * be stopped, we can safely ignore this struct se_cmd.
4111 spin_lock_irqsave(&cmd->t_state_lock, flags);
4112 if (atomic_read(&cmd->t_transport_stop)) {
4113 atomic_set(&cmd->transport_lun_stop, 0);
4114 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4115 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4116 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4117 transport_cmd_check_stop(cmd, 1, 0);
4120 atomic_set(&cmd->transport_lun_fe_stop, 1);
4121 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4123 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4125 ret = transport_stop_tasks_for_cmd(cmd);
4127 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4128 " %d\n", cmd, cmd->t_task_list_num, ret);
4130 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4131 cmd->se_tfo->get_task_tag(cmd));
4132 wait_for_completion(&cmd->transport_lun_stop_comp);
4133 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4134 cmd->se_tfo->get_task_tag(cmd));
4136 transport_remove_cmd_from_queue(cmd);
4141 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4143 struct se_cmd *cmd = NULL;
4144 unsigned long lun_flags, cmd_flags;
4146 * Do exception processing and return CHECK_CONDITION status to the
4149 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4150 while (!list_empty(&lun->lun_cmd_list)) {
4151 cmd = list_first_entry(&lun->lun_cmd_list,
4152 struct se_cmd, se_lun_node);
4153 list_del(&cmd->se_lun_node);
4155 atomic_set(&cmd->transport_lun_active, 0);
4157 * This will notify iscsi_target_transport.c:
4158 * transport_cmd_check_stop() that a LUN shutdown is in
4159 * progress for the iscsi_cmd_t.
4161 spin_lock(&cmd->t_state_lock);
4162 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4163 "_lun_stop for ITT: 0x%08x\n",
4164 cmd->se_lun->unpacked_lun,
4165 cmd->se_tfo->get_task_tag(cmd));
4166 atomic_set(&cmd->transport_lun_stop, 1);
4167 spin_unlock(&cmd->t_state_lock);
4169 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4172 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4173 cmd->se_tfo->get_task_tag(cmd),
4174 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4178 * If the Storage engine still owns the iscsi_cmd_t, determine
4179 * and/or stop its context.
4181 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4182 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4183 cmd->se_tfo->get_task_tag(cmd));
4185 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4186 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4190 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4191 "_wait_for_tasks(): SUCCESS\n",
4192 cmd->se_lun->unpacked_lun,
4193 cmd->se_tfo->get_task_tag(cmd));
4195 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4196 if (!atomic_read(&cmd->transport_dev_active)) {
4197 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4200 atomic_set(&cmd->transport_dev_active, 0);
4201 transport_all_task_dev_remove_state(cmd);
4202 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4204 transport_free_dev_tasks(cmd);
4206 * The Storage engine stopped this struct se_cmd before it was
4207 * send to the fabric frontend for delivery back to the
4208 * Initiator Node. Return this SCSI CDB back with an
4209 * CHECK_CONDITION status.
4212 transport_send_check_condition_and_sense(cmd,
4213 TCM_NON_EXISTENT_LUN, 0);
4215 * If the fabric frontend is waiting for this iscsi_cmd_t to
4216 * be released, notify the waiting thread now that LU has
4217 * finished accessing it.
4219 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4220 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4221 pr_debug("SE_LUN[%d] - Detected FE stop for"
4222 " struct se_cmd: %p ITT: 0x%08x\n",
4224 cmd, cmd->se_tfo->get_task_tag(cmd));
4226 spin_unlock_irqrestore(&cmd->t_state_lock,
4228 transport_cmd_check_stop(cmd, 1, 0);
4229 complete(&cmd->transport_lun_fe_stop_comp);
4230 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4233 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4234 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4236 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4237 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4239 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4242 static int transport_clear_lun_thread(void *p)
4244 struct se_lun *lun = (struct se_lun *)p;
4246 __transport_clear_lun_from_sessions(lun);
4247 complete(&lun->lun_shutdown_comp);
4252 int transport_clear_lun_from_sessions(struct se_lun *lun)
4254 struct task_struct *kt;
4256 kt = kthread_run(transport_clear_lun_thread, lun,
4257 "tcm_cl_%u", lun->unpacked_lun);
4259 pr_err("Unable to start clear_lun thread\n");
4262 wait_for_completion(&lun->lun_shutdown_comp);
4268 * transport_wait_for_tasks - wait for completion to occur
4269 * @cmd: command to wait
4271 * Called from frontend fabric context to wait for storage engine
4272 * to pause and/or release frontend generated struct se_cmd.
4274 bool transport_wait_for_tasks(struct se_cmd *cmd)
4276 unsigned long flags;
4278 spin_lock_irqsave(&cmd->t_state_lock, flags);
4279 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4280 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4284 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4285 * has been set in transport_set_supported_SAM_opcode().
4287 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4288 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4292 * If we are already stopped due to an external event (ie: LUN shutdown)
4293 * sleep until the connection can have the passed struct se_cmd back.
4294 * The cmd->transport_lun_stopped_sem will be upped by
4295 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4296 * has completed its operation on the struct se_cmd.
4298 if (atomic_read(&cmd->transport_lun_stop)) {
4300 pr_debug("wait_for_tasks: Stopping"
4301 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4302 "_stop_comp); for ITT: 0x%08x\n",
4303 cmd->se_tfo->get_task_tag(cmd));
4305 * There is a special case for WRITES where a FE exception +
4306 * LUN shutdown means ConfigFS context is still sleeping on
4307 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4308 * We go ahead and up transport_lun_stop_comp just to be sure
4311 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4312 complete(&cmd->transport_lun_stop_comp);
4313 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4314 spin_lock_irqsave(&cmd->t_state_lock, flags);
4316 transport_all_task_dev_remove_state(cmd);
4318 * At this point, the frontend who was the originator of this
4319 * struct se_cmd, now owns the structure and can be released through
4320 * normal means below.
4322 pr_debug("wait_for_tasks: Stopped"
4323 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4324 "stop_comp); for ITT: 0x%08x\n",
4325 cmd->se_tfo->get_task_tag(cmd));
4327 atomic_set(&cmd->transport_lun_stop, 0);
4329 if (!atomic_read(&cmd->t_transport_active) ||
4330 atomic_read(&cmd->t_transport_aborted)) {
4331 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4335 atomic_set(&cmd->t_transport_stop, 1);
4337 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4338 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4339 cmd, cmd->se_tfo->get_task_tag(cmd),
4340 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4342 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4344 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4346 wait_for_completion(&cmd->t_transport_stop_comp);
4348 spin_lock_irqsave(&cmd->t_state_lock, flags);
4349 atomic_set(&cmd->t_transport_active, 0);
4350 atomic_set(&cmd->t_transport_stop, 0);
4352 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4353 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4354 cmd->se_tfo->get_task_tag(cmd));
4356 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4360 EXPORT_SYMBOL(transport_wait_for_tasks);
4362 static int transport_get_sense_codes(
4367 *asc = cmd->scsi_asc;
4368 *ascq = cmd->scsi_ascq;
4373 static int transport_set_sense_codes(
4378 cmd->scsi_asc = asc;
4379 cmd->scsi_ascq = ascq;
4384 int transport_send_check_condition_and_sense(
4389 unsigned char *buffer = cmd->sense_buffer;
4390 unsigned long flags;
4392 u8 asc = 0, ascq = 0;
4394 spin_lock_irqsave(&cmd->t_state_lock, flags);
4395 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4396 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4399 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4400 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4402 if (!reason && from_transport)
4405 if (!from_transport)
4406 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4408 * Data Segment and SenseLength of the fabric response PDU.
4410 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4411 * from include/scsi/scsi_cmnd.h
4413 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4414 TRANSPORT_SENSE_BUFFER);
4416 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4417 * SENSE KEY values from include/scsi/scsi.h
4420 case TCM_NON_EXISTENT_LUN:
4422 buffer[offset] = 0x70;
4423 /* ILLEGAL REQUEST */
4424 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4425 /* LOGICAL UNIT NOT SUPPORTED */
4426 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4428 case TCM_UNSUPPORTED_SCSI_OPCODE:
4429 case TCM_SECTOR_COUNT_TOO_MANY:
4431 buffer[offset] = 0x70;
4432 /* ILLEGAL REQUEST */
4433 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4434 /* INVALID COMMAND OPERATION CODE */
4435 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4437 case TCM_UNKNOWN_MODE_PAGE:
4439 buffer[offset] = 0x70;
4440 /* ILLEGAL REQUEST */
4441 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4442 /* INVALID FIELD IN CDB */
4443 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4445 case TCM_CHECK_CONDITION_ABORT_CMD:
4447 buffer[offset] = 0x70;
4448 /* ABORTED COMMAND */
4449 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4450 /* BUS DEVICE RESET FUNCTION OCCURRED */
4451 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4452 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4454 case TCM_INCORRECT_AMOUNT_OF_DATA:
4456 buffer[offset] = 0x70;
4457 /* ABORTED COMMAND */
4458 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4460 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4461 /* NOT ENOUGH UNSOLICITED DATA */
4462 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4464 case TCM_INVALID_CDB_FIELD:
4466 buffer[offset] = 0x70;
4467 /* ABORTED COMMAND */
4468 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4469 /* INVALID FIELD IN CDB */
4470 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4472 case TCM_INVALID_PARAMETER_LIST:
4474 buffer[offset] = 0x70;
4475 /* ABORTED COMMAND */
4476 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4477 /* INVALID FIELD IN PARAMETER LIST */
4478 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4480 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4482 buffer[offset] = 0x70;
4483 /* ABORTED COMMAND */
4484 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4486 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4487 /* UNEXPECTED_UNSOLICITED_DATA */
4488 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4490 case TCM_SERVICE_CRC_ERROR:
4492 buffer[offset] = 0x70;
4493 /* ABORTED COMMAND */
4494 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4495 /* PROTOCOL SERVICE CRC ERROR */
4496 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4498 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4500 case TCM_SNACK_REJECTED:
4502 buffer[offset] = 0x70;
4503 /* ABORTED COMMAND */
4504 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4506 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4507 /* FAILED RETRANSMISSION REQUEST */
4508 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4510 case TCM_WRITE_PROTECTED:
4512 buffer[offset] = 0x70;
4514 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4515 /* WRITE PROTECTED */
4516 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4518 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4520 buffer[offset] = 0x70;
4521 /* UNIT ATTENTION */
4522 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4523 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4524 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4525 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4527 case TCM_CHECK_CONDITION_NOT_READY:
4529 buffer[offset] = 0x70;
4531 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4532 transport_get_sense_codes(cmd, &asc, &ascq);
4533 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4534 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4536 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4539 buffer[offset] = 0x70;
4540 /* ILLEGAL REQUEST */
4541 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4542 /* LOGICAL UNIT COMMUNICATION FAILURE */
4543 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4547 * This code uses linux/include/scsi/scsi.h SAM status codes!
4549 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4551 * Automatically padded, this value is encoded in the fabric's
4552 * data_length response PDU containing the SCSI defined sense data.
4554 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4557 return cmd->se_tfo->queue_status(cmd);
4559 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4561 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4565 if (atomic_read(&cmd->t_transport_aborted) != 0) {
4567 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4570 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4571 " status for CDB: 0x%02x ITT: 0x%08x\n",
4573 cmd->se_tfo->get_task_tag(cmd));
4575 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4576 cmd->se_tfo->queue_status(cmd);
4581 EXPORT_SYMBOL(transport_check_aborted_status);
4583 void transport_send_task_abort(struct se_cmd *cmd)
4585 unsigned long flags;
4587 spin_lock_irqsave(&cmd->t_state_lock, flags);
4588 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4592 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4595 * If there are still expected incoming fabric WRITEs, we wait
4596 * until until they have completed before sending a TASK_ABORTED
4597 * response. This response with TASK_ABORTED status will be
4598 * queued back to fabric module by transport_check_aborted_status().
4600 if (cmd->data_direction == DMA_TO_DEVICE) {
4601 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4602 atomic_inc(&cmd->t_transport_aborted);
4603 smp_mb__after_atomic_inc();
4604 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4605 transport_new_cmd_failure(cmd);
4609 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4611 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4612 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4613 cmd->se_tfo->get_task_tag(cmd));
4615 cmd->se_tfo->queue_status(cmd);
4618 /* transport_generic_do_tmr():
4622 int transport_generic_do_tmr(struct se_cmd *cmd)
4624 struct se_device *dev = cmd->se_dev;
4625 struct se_tmr_req *tmr = cmd->se_tmr_req;
4628 switch (tmr->function) {
4629 case TMR_ABORT_TASK:
4630 tmr->response = TMR_FUNCTION_REJECTED;
4632 case TMR_ABORT_TASK_SET:
4634 case TMR_CLEAR_TASK_SET:
4635 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4638 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4639 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4640 TMR_FUNCTION_REJECTED;
4642 case TMR_TARGET_WARM_RESET:
4643 tmr->response = TMR_FUNCTION_REJECTED;
4645 case TMR_TARGET_COLD_RESET:
4646 tmr->response = TMR_FUNCTION_REJECTED;
4649 pr_err("Uknown TMR function: 0x%02x.\n",
4651 tmr->response = TMR_FUNCTION_REJECTED;
4655 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4656 cmd->se_tfo->queue_tm_rsp(cmd);
4658 transport_cmd_check_stop_to_fabric(cmd);
4662 /* transport_processing_thread():
4666 static int transport_processing_thread(void *param)
4670 struct se_device *dev = (struct se_device *) param;
4672 set_user_nice(current, -20);
4674 while (!kthread_should_stop()) {
4675 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4676 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4677 kthread_should_stop());
4682 __transport_execute_tasks(dev);
4684 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4688 switch (cmd->t_state) {
4689 case TRANSPORT_NEW_CMD:
4692 case TRANSPORT_NEW_CMD_MAP:
4693 if (!cmd->se_tfo->new_cmd_map) {
4694 pr_err("cmd->se_tfo->new_cmd_map is"
4695 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4698 ret = cmd->se_tfo->new_cmd_map(cmd);
4700 cmd->transport_error_status = ret;
4701 transport_generic_request_failure(cmd,
4702 0, (cmd->data_direction !=
4706 ret = transport_generic_new_cmd(cmd);
4708 cmd->transport_error_status = ret;
4709 transport_generic_request_failure(cmd,
4710 0, (cmd->data_direction !=
4714 case TRANSPORT_PROCESS_WRITE:
4715 transport_generic_process_write(cmd);
4717 case TRANSPORT_PROCESS_TMR:
4718 transport_generic_do_tmr(cmd);
4720 case TRANSPORT_COMPLETE_QF_WP:
4721 transport_write_pending_qf(cmd);
4723 case TRANSPORT_COMPLETE_QF_OK:
4724 transport_complete_qf(cmd);
4727 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4728 "i_state: %d on SE LUN: %u\n",
4730 cmd->se_tfo->get_task_tag(cmd),
4731 cmd->se_tfo->get_cmd_state(cmd),
4732 cmd->se_lun->unpacked_lun);
4740 WARN_ON(!list_empty(&dev->state_task_list));
4741 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4742 dev->process_thread = NULL;