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/version.h>
30 #include <linux/net.h>
31 #include <linux/delay.h>
32 #include <linux/string.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/blkdev.h>
36 #include <linux/spinlock.h>
37 #include <linux/kthread.h>
39 #include <linux/cdrom.h>
40 #include <asm/unaligned.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_cmnd.h>
45 #include <scsi/scsi_tcq.h>
47 #include <target/target_core_base.h>
48 #include <target/target_core_device.h>
49 #include <target/target_core_tmr.h>
50 #include <target/target_core_tpg.h>
51 #include <target/target_core_transport.h>
52 #include <target/target_core_fabric_ops.h>
53 #include <target/target_core_configfs.h>
55 #include "target_core_alua.h"
56 #include "target_core_hba.h"
57 #include "target_core_pr.h"
58 #include "target_core_scdb.h"
59 #include "target_core_ua.h"
61 static int sub_api_initialized
;
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 /* Used for transport_dev_get_map_*() */
74 typedef int (*map_func_t
)(struct se_task
*, u32
);
76 static int transport_generic_write_pending(struct se_cmd
*);
77 static int transport_processing_thread(void *param
);
78 static int __transport_execute_tasks(struct se_device
*dev
);
79 static void transport_complete_task_attr(struct se_cmd
*cmd
);
80 static int transport_complete_qf(struct se_cmd
*cmd
);
81 static void transport_handle_queue_full(struct se_cmd
*cmd
,
82 struct se_device
*dev
, int (*qf_callback
)(struct se_cmd
*));
83 static void transport_direct_request_timeout(struct se_cmd
*cmd
);
84 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
85 static u32
transport_allocate_tasks(struct se_cmd
*cmd
,
86 unsigned long long starting_lba
,
87 enum dma_data_direction data_direction
,
88 struct scatterlist
*sgl
, unsigned int nents
);
89 static int transport_generic_get_mem(struct se_cmd
*cmd
);
90 static int transport_generic_remove(struct se_cmd
*cmd
,
91 int session_reinstatement
);
92 static void transport_release_fe_cmd(struct se_cmd
*cmd
);
93 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
94 struct se_queue_obj
*qobj
);
95 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
96 static void transport_stop_all_task_timers(struct se_cmd
*cmd
);
98 int init_se_kmem_caches(void)
100 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
101 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
103 pr_err("kmem_cache_create for struct se_cmd failed\n");
106 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
107 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
109 if (!se_tmr_req_cache
) {
110 pr_err("kmem_cache_create() for struct se_tmr_req"
114 se_sess_cache
= kmem_cache_create("se_sess_cache",
115 sizeof(struct se_session
), __alignof__(struct se_session
),
117 if (!se_sess_cache
) {
118 pr_err("kmem_cache_create() for struct se_session"
122 se_ua_cache
= kmem_cache_create("se_ua_cache",
123 sizeof(struct se_ua
), __alignof__(struct se_ua
),
126 pr_err("kmem_cache_create() for struct se_ua failed\n");
129 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
130 sizeof(struct t10_pr_registration
),
131 __alignof__(struct t10_pr_registration
), 0, NULL
);
132 if (!t10_pr_reg_cache
) {
133 pr_err("kmem_cache_create() for struct t10_pr_registration"
137 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
138 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
140 if (!t10_alua_lu_gp_cache
) {
141 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
145 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
146 sizeof(struct t10_alua_lu_gp_member
),
147 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
148 if (!t10_alua_lu_gp_mem_cache
) {
149 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
153 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
154 sizeof(struct t10_alua_tg_pt_gp
),
155 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
156 if (!t10_alua_tg_pt_gp_cache
) {
157 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
161 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
162 "t10_alua_tg_pt_gp_mem_cache",
163 sizeof(struct t10_alua_tg_pt_gp_member
),
164 __alignof__(struct t10_alua_tg_pt_gp_member
),
166 if (!t10_alua_tg_pt_gp_mem_cache
) {
167 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
175 kmem_cache_destroy(se_cmd_cache
);
176 if (se_tmr_req_cache
)
177 kmem_cache_destroy(se_tmr_req_cache
);
179 kmem_cache_destroy(se_sess_cache
);
181 kmem_cache_destroy(se_ua_cache
);
182 if (t10_pr_reg_cache
)
183 kmem_cache_destroy(t10_pr_reg_cache
);
184 if (t10_alua_lu_gp_cache
)
185 kmem_cache_destroy(t10_alua_lu_gp_cache
);
186 if (t10_alua_lu_gp_mem_cache
)
187 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
188 if (t10_alua_tg_pt_gp_cache
)
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
190 if (t10_alua_tg_pt_gp_mem_cache
)
191 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
195 void release_se_kmem_caches(void)
197 kmem_cache_destroy(se_cmd_cache
);
198 kmem_cache_destroy(se_tmr_req_cache
);
199 kmem_cache_destroy(se_sess_cache
);
200 kmem_cache_destroy(se_ua_cache
);
201 kmem_cache_destroy(t10_pr_reg_cache
);
202 kmem_cache_destroy(t10_alua_lu_gp_cache
);
203 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
205 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
208 /* This code ensures unique mib indexes are handed out. */
209 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
210 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
213 * Allocate a new row index for the entry type specified
215 u32
scsi_get_new_index(scsi_index_t type
)
219 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
221 spin_lock(&scsi_mib_index_lock
);
222 new_index
= ++scsi_mib_index
[type
];
223 spin_unlock(&scsi_mib_index_lock
);
228 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
230 atomic_set(&qobj
->queue_cnt
, 0);
231 INIT_LIST_HEAD(&qobj
->qobj_list
);
232 init_waitqueue_head(&qobj
->thread_wq
);
233 spin_lock_init(&qobj
->cmd_queue_lock
);
235 EXPORT_SYMBOL(transport_init_queue_obj
);
237 static int transport_subsystem_reqmods(void)
241 ret
= request_module("target_core_iblock");
243 pr_err("Unable to load target_core_iblock\n");
245 ret
= request_module("target_core_file");
247 pr_err("Unable to load target_core_file\n");
249 ret
= request_module("target_core_pscsi");
251 pr_err("Unable to load target_core_pscsi\n");
253 ret
= request_module("target_core_stgt");
255 pr_err("Unable to load target_core_stgt\n");
260 int transport_subsystem_check_init(void)
264 if (sub_api_initialized
)
267 * Request the loading of known TCM subsystem plugins..
269 ret
= transport_subsystem_reqmods();
273 sub_api_initialized
= 1;
277 struct se_session
*transport_init_session(void)
279 struct se_session
*se_sess
;
281 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
283 pr_err("Unable to allocate struct se_session from"
285 return ERR_PTR(-ENOMEM
);
287 INIT_LIST_HEAD(&se_sess
->sess_list
);
288 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
292 EXPORT_SYMBOL(transport_init_session
);
295 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
297 void __transport_register_session(
298 struct se_portal_group
*se_tpg
,
299 struct se_node_acl
*se_nacl
,
300 struct se_session
*se_sess
,
301 void *fabric_sess_ptr
)
303 unsigned char buf
[PR_REG_ISID_LEN
];
305 se_sess
->se_tpg
= se_tpg
;
306 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
308 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
310 * Only set for struct se_session's that will actually be moving I/O.
311 * eg: *NOT* discovery sessions.
315 * If the fabric module supports an ISID based TransportID,
316 * save this value in binary from the fabric I_T Nexus now.
318 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
319 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
320 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
321 &buf
[0], PR_REG_ISID_LEN
);
322 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
324 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
326 * The se_nacl->nacl_sess pointer will be set to the
327 * last active I_T Nexus for each struct se_node_acl.
329 se_nacl
->nacl_sess
= se_sess
;
331 list_add_tail(&se_sess
->sess_acl_list
,
332 &se_nacl
->acl_sess_list
);
333 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
335 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
337 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
338 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
340 EXPORT_SYMBOL(__transport_register_session
);
342 void transport_register_session(
343 struct se_portal_group
*se_tpg
,
344 struct se_node_acl
*se_nacl
,
345 struct se_session
*se_sess
,
346 void *fabric_sess_ptr
)
348 spin_lock_bh(&se_tpg
->session_lock
);
349 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
350 spin_unlock_bh(&se_tpg
->session_lock
);
352 EXPORT_SYMBOL(transport_register_session
);
354 void transport_deregister_session_configfs(struct se_session
*se_sess
)
356 struct se_node_acl
*se_nacl
;
359 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
361 se_nacl
= se_sess
->se_node_acl
;
363 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
364 list_del(&se_sess
->sess_acl_list
);
366 * If the session list is empty, then clear the pointer.
367 * Otherwise, set the struct se_session pointer from the tail
368 * element of the per struct se_node_acl active session list.
370 if (list_empty(&se_nacl
->acl_sess_list
))
371 se_nacl
->nacl_sess
= NULL
;
373 se_nacl
->nacl_sess
= container_of(
374 se_nacl
->acl_sess_list
.prev
,
375 struct se_session
, sess_acl_list
);
377 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
380 EXPORT_SYMBOL(transport_deregister_session_configfs
);
382 void transport_free_session(struct se_session
*se_sess
)
384 kmem_cache_free(se_sess_cache
, se_sess
);
386 EXPORT_SYMBOL(transport_free_session
);
388 void transport_deregister_session(struct se_session
*se_sess
)
390 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
391 struct se_node_acl
*se_nacl
;
394 transport_free_session(se_sess
);
398 spin_lock_bh(&se_tpg
->session_lock
);
399 list_del(&se_sess
->sess_list
);
400 se_sess
->se_tpg
= NULL
;
401 se_sess
->fabric_sess_ptr
= NULL
;
402 spin_unlock_bh(&se_tpg
->session_lock
);
405 * Determine if we need to do extra work for this initiator node's
406 * struct se_node_acl if it had been previously dynamically generated.
408 se_nacl
= se_sess
->se_node_acl
;
410 spin_lock_bh(&se_tpg
->acl_node_lock
);
411 if (se_nacl
->dynamic_node_acl
) {
412 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
414 list_del(&se_nacl
->acl_list
);
415 se_tpg
->num_node_acls
--;
416 spin_unlock_bh(&se_tpg
->acl_node_lock
);
418 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
419 core_free_device_list_for_node(se_nacl
, se_tpg
);
420 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
422 spin_lock_bh(&se_tpg
->acl_node_lock
);
425 spin_unlock_bh(&se_tpg
->acl_node_lock
);
428 transport_free_session(se_sess
);
430 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
431 se_tpg
->se_tpg_tfo
->get_fabric_name());
433 EXPORT_SYMBOL(transport_deregister_session
);
436 * Called with cmd->t_state_lock held.
438 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
440 struct se_device
*dev
;
441 struct se_task
*task
;
444 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
449 if (atomic_read(&task
->task_active
))
452 if (!atomic_read(&task
->task_state_active
))
455 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
456 list_del(&task
->t_state_list
);
457 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
458 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
459 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
461 atomic_set(&task
->task_state_active
, 0);
462 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
466 /* transport_cmd_check_stop():
468 * 'transport_off = 1' determines if t_transport_active should be cleared.
469 * 'transport_off = 2' determines if task_dev_state should be removed.
471 * A non-zero u8 t_state sets cmd->t_state.
472 * Returns 1 when command is stopped, else 0.
474 static int transport_cmd_check_stop(
481 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
483 * Determine if IOCTL context caller in requesting the stopping of this
484 * command for LUN shutdown purposes.
486 if (atomic_read(&cmd
->transport_lun_stop
)) {
487 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
488 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
489 cmd
->se_tfo
->get_task_tag(cmd
));
491 cmd
->deferred_t_state
= cmd
->t_state
;
492 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
493 atomic_set(&cmd
->t_transport_active
, 0);
494 if (transport_off
== 2)
495 transport_all_task_dev_remove_state(cmd
);
496 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
498 complete(&cmd
->transport_lun_stop_comp
);
502 * Determine if frontend context caller is requesting the stopping of
503 * this command for frontend exceptions.
505 if (atomic_read(&cmd
->t_transport_stop
)) {
506 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
507 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
508 cmd
->se_tfo
->get_task_tag(cmd
));
510 cmd
->deferred_t_state
= cmd
->t_state
;
511 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
512 if (transport_off
== 2)
513 transport_all_task_dev_remove_state(cmd
);
516 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
519 if (transport_off
== 2)
521 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
523 complete(&cmd
->t_transport_stop_comp
);
527 atomic_set(&cmd
->t_transport_active
, 0);
528 if (transport_off
== 2) {
529 transport_all_task_dev_remove_state(cmd
);
531 * Clear struct se_cmd->se_lun before the transport_off == 2
532 * handoff to fabric module.
536 * Some fabric modules like tcm_loop can release
537 * their internally allocated I/O reference now and
540 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
541 spin_unlock_irqrestore(
542 &cmd
->t_state_lock
, flags
);
544 cmd
->se_tfo
->check_stop_free(cmd
);
548 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
552 cmd
->t_state
= t_state
;
553 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
558 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
560 return transport_cmd_check_stop(cmd
, 2, 0);
563 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
565 struct se_lun
*lun
= cmd
->se_lun
;
571 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
572 if (!atomic_read(&cmd
->transport_dev_active
)) {
573 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
576 atomic_set(&cmd
->transport_dev_active
, 0);
577 transport_all_task_dev_remove_state(cmd
);
578 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
582 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
583 if (atomic_read(&cmd
->transport_lun_active
)) {
584 list_del(&cmd
->se_lun_node
);
585 atomic_set(&cmd
->transport_lun_active
, 0);
587 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
588 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
591 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
594 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
596 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
597 transport_lun_remove_cmd(cmd
);
599 if (transport_cmd_check_stop_to_fabric(cmd
))
602 transport_generic_remove(cmd
, 0);
605 void transport_cmd_finish_abort_tmr(struct se_cmd
*cmd
)
607 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
609 if (transport_cmd_check_stop_to_fabric(cmd
))
612 transport_generic_remove(cmd
, 0);
615 static void transport_add_cmd_to_queue(
619 struct se_device
*dev
= cmd
->se_dev
;
620 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
623 INIT_LIST_HEAD(&cmd
->se_queue_node
);
626 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
627 cmd
->t_state
= t_state
;
628 atomic_set(&cmd
->t_transport_active
, 1);
629 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
632 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
633 if (cmd
->se_cmd_flags
& SCF_EMULATE_QUEUE_FULL
) {
634 cmd
->se_cmd_flags
&= ~SCF_EMULATE_QUEUE_FULL
;
635 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
637 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
638 atomic_inc(&cmd
->t_transport_queue_active
);
639 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
641 atomic_inc(&qobj
->queue_cnt
);
642 wake_up_interruptible(&qobj
->thread_wq
);
645 static struct se_cmd
*
646 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
651 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
652 if (list_empty(&qobj
->qobj_list
)) {
653 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
656 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
658 atomic_dec(&cmd
->t_transport_queue_active
);
660 list_del(&cmd
->se_queue_node
);
661 atomic_dec(&qobj
->queue_cnt
);
662 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
667 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
668 struct se_queue_obj
*qobj
)
673 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
674 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
675 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
679 list_for_each_entry(t
, &qobj
->qobj_list
, se_queue_node
)
681 atomic_dec(&cmd
->t_transport_queue_active
);
682 atomic_dec(&qobj
->queue_cnt
);
683 list_del(&cmd
->se_queue_node
);
686 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
688 if (atomic_read(&cmd
->t_transport_queue_active
)) {
689 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
690 cmd
->se_tfo
->get_task_tag(cmd
),
691 atomic_read(&cmd
->t_transport_queue_active
));
696 * Completion function used by TCM subsystem plugins (such as FILEIO)
697 * for queueing up response from struct se_subsystem_api->do_task()
699 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
701 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
702 struct se_task
, t_list
);
705 cmd
->scsi_status
= SAM_STAT_GOOD
;
706 task
->task_scsi_status
= GOOD
;
708 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
709 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
710 task
->task_se_cmd
->transport_error_status
=
711 PYX_TRANSPORT_ILLEGAL_REQUEST
;
714 transport_complete_task(task
, good
);
716 EXPORT_SYMBOL(transport_complete_sync_cache
);
718 /* transport_complete_task():
720 * Called from interrupt and non interrupt context depending
721 * on the transport plugin.
723 void transport_complete_task(struct se_task
*task
, int success
)
725 struct se_cmd
*cmd
= task
->task_se_cmd
;
726 struct se_device
*dev
= task
->se_dev
;
730 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
731 cmd
->t_task_cdb
[0], dev
);
734 atomic_inc(&dev
->depth_left
);
736 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
737 atomic_set(&task
->task_active
, 0);
740 * See if any sense data exists, if so set the TASK_SENSE flag.
741 * Also check for any other post completion work that needs to be
742 * done by the plugins.
744 if (dev
&& dev
->transport
->transport_complete
) {
745 if (dev
->transport
->transport_complete(task
) != 0) {
746 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
747 task
->task_sense
= 1;
753 * See if we are waiting for outstanding struct se_task
754 * to complete for an exception condition
756 if (atomic_read(&task
->task_stop
)) {
758 * Decrement cmd->t_se_count if this task had
759 * previously thrown its timeout exception handler.
761 if (atomic_read(&task
->task_timeout
)) {
762 atomic_dec(&cmd
->t_se_count
);
763 atomic_set(&task
->task_timeout
, 0);
765 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
767 complete(&task
->task_stop_comp
);
771 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
772 * left counter to determine when the struct se_cmd is ready to be queued to
773 * the processing thread.
775 if (atomic_read(&task
->task_timeout
)) {
776 if (!atomic_dec_and_test(
777 &cmd
->t_task_cdbs_timeout_left
)) {
778 spin_unlock_irqrestore(&cmd
->t_state_lock
,
782 t_state
= TRANSPORT_COMPLETE_TIMEOUT
;
783 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
785 transport_add_cmd_to_queue(cmd
, t_state
);
788 atomic_dec(&cmd
->t_task_cdbs_timeout_left
);
791 * Decrement the outstanding t_task_cdbs_left count. The last
792 * struct se_task from struct se_cmd will complete itself into the
793 * device queue depending upon int success.
795 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
797 cmd
->t_tasks_failed
= 1;
799 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
803 if (!success
|| cmd
->t_tasks_failed
) {
804 t_state
= TRANSPORT_COMPLETE_FAILURE
;
805 if (!task
->task_error_status
) {
806 task
->task_error_status
=
807 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
808 cmd
->transport_error_status
=
809 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
812 atomic_set(&cmd
->t_transport_complete
, 1);
813 t_state
= TRANSPORT_COMPLETE_OK
;
815 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
817 transport_add_cmd_to_queue(cmd
, t_state
);
819 EXPORT_SYMBOL(transport_complete_task
);
822 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
823 * struct se_task list are ready to be added to the active execution list
826 * Called with se_dev_t->execute_task_lock called.
828 static inline int transport_add_task_check_sam_attr(
829 struct se_task
*task
,
830 struct se_task
*task_prev
,
831 struct se_device
*dev
)
834 * No SAM Task attribute emulation enabled, add to tail of
837 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
838 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
842 * HEAD_OF_QUEUE attribute for received CDB, which means
843 * the first task that is associated with a struct se_cmd goes to
844 * head of the struct se_device->execute_task_list, and task_prev
845 * after that for each subsequent task
847 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
848 list_add(&task
->t_execute_list
,
849 (task_prev
!= NULL
) ?
850 &task_prev
->t_execute_list
:
851 &dev
->execute_task_list
);
853 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
854 " in execution queue\n",
855 task
->task_se_cmd
->t_task_cdb
[0]);
859 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
860 * transitioned from Dermant -> Active state, and are added to the end
861 * of the struct se_device->execute_task_list
863 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
867 /* __transport_add_task_to_execute_queue():
869 * Called with se_dev_t->execute_task_lock called.
871 static void __transport_add_task_to_execute_queue(
872 struct se_task
*task
,
873 struct se_task
*task_prev
,
874 struct se_device
*dev
)
878 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
879 atomic_inc(&dev
->execute_tasks
);
881 if (atomic_read(&task
->task_state_active
))
884 * Determine if this task needs to go to HEAD_OF_QUEUE for the
885 * state list as well. Running with SAM Task Attribute emulation
886 * will always return head_of_queue == 0 here
889 list_add(&task
->t_state_list
, (task_prev
) ?
890 &task_prev
->t_state_list
:
891 &dev
->state_task_list
);
893 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
895 atomic_set(&task
->task_state_active
, 1);
897 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
898 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
902 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
904 struct se_device
*dev
;
905 struct se_task
*task
;
908 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
909 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
912 if (atomic_read(&task
->task_state_active
))
915 spin_lock(&dev
->execute_task_lock
);
916 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
917 atomic_set(&task
->task_state_active
, 1);
919 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
920 task
->task_se_cmd
->se_tfo
->get_task_tag(
921 task
->task_se_cmd
), task
, dev
);
923 spin_unlock(&dev
->execute_task_lock
);
925 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
928 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
930 struct se_device
*dev
= cmd
->se_dev
;
931 struct se_task
*task
, *task_prev
= NULL
;
934 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
935 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
936 if (atomic_read(&task
->task_execute_queue
))
939 * __transport_add_task_to_execute_queue() handles the
940 * SAM Task Attribute emulation if enabled
942 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
943 atomic_set(&task
->task_execute_queue
, 1);
946 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
949 /* transport_remove_task_from_execute_queue():
953 void transport_remove_task_from_execute_queue(
954 struct se_task
*task
,
955 struct se_device
*dev
)
959 if (atomic_read(&task
->task_execute_queue
) == 0) {
964 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
965 list_del(&task
->t_execute_list
);
966 atomic_set(&task
->task_execute_queue
, 0);
967 atomic_dec(&dev
->execute_tasks
);
968 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
972 * Handle QUEUE_FULL / -EAGAIN status
975 static void target_qf_do_work(struct work_struct
*work
)
977 struct se_device
*dev
= container_of(work
, struct se_device
,
979 struct se_cmd
*cmd
, *cmd_tmp
;
981 spin_lock_irq(&dev
->qf_cmd_lock
);
982 list_for_each_entry_safe(cmd
, cmd_tmp
, &dev
->qf_cmd_list
, se_qf_node
) {
984 list_del(&cmd
->se_qf_node
);
985 atomic_dec(&dev
->dev_qf_count
);
986 smp_mb__after_atomic_dec();
987 spin_unlock_irq(&dev
->qf_cmd_lock
);
989 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
990 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
991 (cmd
->t_state
== TRANSPORT_COMPLETE_OK
) ? "COMPLETE_OK" :
992 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
995 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
996 * has been added to head of queue
998 transport_add_cmd_to_queue(cmd
, cmd
->t_state
);
1000 spin_lock_irq(&dev
->qf_cmd_lock
);
1002 spin_unlock_irq(&dev
->qf_cmd_lock
);
1005 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
1007 switch (cmd
->data_direction
) {
1010 case DMA_FROM_DEVICE
:
1014 case DMA_BIDIRECTIONAL
:
1023 void transport_dump_dev_state(
1024 struct se_device
*dev
,
1028 *bl
+= sprintf(b
+ *bl
, "Status: ");
1029 switch (dev
->dev_status
) {
1030 case TRANSPORT_DEVICE_ACTIVATED
:
1031 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1033 case TRANSPORT_DEVICE_DEACTIVATED
:
1034 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1036 case TRANSPORT_DEVICE_SHUTDOWN
:
1037 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1039 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1040 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1041 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1044 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1048 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1049 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1051 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1052 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1053 *bl
+= sprintf(b
+ *bl
, " ");
1056 /* transport_release_all_cmds():
1060 static void transport_release_all_cmds(struct se_device
*dev
)
1062 struct se_cmd
*cmd
, *tcmd
;
1063 int bug_out
= 0, t_state
;
1064 unsigned long flags
;
1066 spin_lock_irqsave(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1067 list_for_each_entry_safe(cmd
, tcmd
, &dev
->dev_queue_obj
.qobj_list
,
1069 t_state
= cmd
->t_state
;
1070 list_del(&cmd
->se_queue_node
);
1071 spin_unlock_irqrestore(&dev
->dev_queue_obj
.cmd_queue_lock
,
1074 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
1075 " t_state: %u directly\n",
1076 cmd
->se_tfo
->get_task_tag(cmd
),
1077 cmd
->se_tfo
->get_cmd_state(cmd
), t_state
);
1079 transport_release_fe_cmd(cmd
);
1082 spin_lock_irqsave(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1084 spin_unlock_irqrestore(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1091 void transport_dump_vpd_proto_id(
1092 struct t10_vpd
*vpd
,
1093 unsigned char *p_buf
,
1096 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1099 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1100 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1102 switch (vpd
->protocol_identifier
) {
1104 sprintf(buf
+len
, "Fibre Channel\n");
1107 sprintf(buf
+len
, "Parallel SCSI\n");
1110 sprintf(buf
+len
, "SSA\n");
1113 sprintf(buf
+len
, "IEEE 1394\n");
1116 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1120 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1123 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1126 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1130 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1133 sprintf(buf
+len
, "Unknown 0x%02x\n",
1134 vpd
->protocol_identifier
);
1139 strncpy(p_buf
, buf
, p_buf_len
);
1141 pr_debug("%s", buf
);
1145 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1148 * Check if the Protocol Identifier Valid (PIV) bit is set..
1150 * from spc3r23.pdf section 7.5.1
1152 if (page_83
[1] & 0x80) {
1153 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1154 vpd
->protocol_identifier_set
= 1;
1155 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1158 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1160 int transport_dump_vpd_assoc(
1161 struct t10_vpd
*vpd
,
1162 unsigned char *p_buf
,
1165 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1169 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1170 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1172 switch (vpd
->association
) {
1174 sprintf(buf
+len
, "addressed logical unit\n");
1177 sprintf(buf
+len
, "target port\n");
1180 sprintf(buf
+len
, "SCSI target device\n");
1183 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1189 strncpy(p_buf
, buf
, p_buf_len
);
1191 pr_debug("%s", buf
);
1196 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1199 * The VPD identification association..
1201 * from spc3r23.pdf Section 7.6.3.1 Table 297
1203 vpd
->association
= (page_83
[1] & 0x30);
1204 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1206 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1208 int transport_dump_vpd_ident_type(
1209 struct t10_vpd
*vpd
,
1210 unsigned char *p_buf
,
1213 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1217 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1218 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1220 switch (vpd
->device_identifier_type
) {
1222 sprintf(buf
+len
, "Vendor specific\n");
1225 sprintf(buf
+len
, "T10 Vendor ID based\n");
1228 sprintf(buf
+len
, "EUI-64 based\n");
1231 sprintf(buf
+len
, "NAA\n");
1234 sprintf(buf
+len
, "Relative target port identifier\n");
1237 sprintf(buf
+len
, "SCSI name string\n");
1240 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1241 vpd
->device_identifier_type
);
1247 if (p_buf_len
< strlen(buf
)+1)
1249 strncpy(p_buf
, buf
, p_buf_len
);
1251 pr_debug("%s", buf
);
1257 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1260 * The VPD identifier type..
1262 * from spc3r23.pdf Section 7.6.3.1 Table 298
1264 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1265 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1267 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1269 int transport_dump_vpd_ident(
1270 struct t10_vpd
*vpd
,
1271 unsigned char *p_buf
,
1274 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1277 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1279 switch (vpd
->device_identifier_code_set
) {
1280 case 0x01: /* Binary */
1281 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1282 &vpd
->device_identifier
[0]);
1284 case 0x02: /* ASCII */
1285 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1286 &vpd
->device_identifier
[0]);
1288 case 0x03: /* UTF-8 */
1289 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1290 &vpd
->device_identifier
[0]);
1293 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1294 " 0x%02x", vpd
->device_identifier_code_set
);
1300 strncpy(p_buf
, buf
, p_buf_len
);
1302 pr_debug("%s", buf
);
1308 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1310 static const char hex_str
[] = "0123456789abcdef";
1311 int j
= 0, i
= 4; /* offset to start of the identifer */
1314 * The VPD Code Set (encoding)
1316 * from spc3r23.pdf Section 7.6.3.1 Table 296
1318 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1319 switch (vpd
->device_identifier_code_set
) {
1320 case 0x01: /* Binary */
1321 vpd
->device_identifier
[j
++] =
1322 hex_str
[vpd
->device_identifier_type
];
1323 while (i
< (4 + page_83
[3])) {
1324 vpd
->device_identifier
[j
++] =
1325 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1326 vpd
->device_identifier
[j
++] =
1327 hex_str
[page_83
[i
] & 0x0f];
1331 case 0x02: /* ASCII */
1332 case 0x03: /* UTF-8 */
1333 while (i
< (4 + page_83
[3]))
1334 vpd
->device_identifier
[j
++] = page_83
[i
++];
1340 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1342 EXPORT_SYMBOL(transport_set_vpd_ident
);
1344 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1347 * If this device is from Target_Core_Mod/pSCSI, disable the
1348 * SAM Task Attribute emulation.
1350 * This is currently not available in upsream Linux/SCSI Target
1351 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1353 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1354 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1358 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1359 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1360 " device\n", dev
->transport
->name
,
1361 dev
->transport
->get_device_rev(dev
));
1364 static void scsi_dump_inquiry(struct se_device
*dev
)
1366 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1369 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1371 pr_debug(" Vendor: ");
1372 for (i
= 0; i
< 8; i
++)
1373 if (wwn
->vendor
[i
] >= 0x20)
1374 pr_debug("%c", wwn
->vendor
[i
]);
1378 pr_debug(" Model: ");
1379 for (i
= 0; i
< 16; i
++)
1380 if (wwn
->model
[i
] >= 0x20)
1381 pr_debug("%c", wwn
->model
[i
]);
1385 pr_debug(" Revision: ");
1386 for (i
= 0; i
< 4; i
++)
1387 if (wwn
->revision
[i
] >= 0x20)
1388 pr_debug("%c", wwn
->revision
[i
]);
1394 device_type
= dev
->transport
->get_device_type(dev
);
1395 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1396 pr_debug(" ANSI SCSI revision: %02x\n",
1397 dev
->transport
->get_device_rev(dev
));
1400 struct se_device
*transport_add_device_to_core_hba(
1402 struct se_subsystem_api
*transport
,
1403 struct se_subsystem_dev
*se_dev
,
1405 void *transport_dev
,
1406 struct se_dev_limits
*dev_limits
,
1407 const char *inquiry_prod
,
1408 const char *inquiry_rev
)
1411 struct se_device
*dev
;
1413 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1415 pr_err("Unable to allocate memory for se_dev_t\n");
1419 transport_init_queue_obj(&dev
->dev_queue_obj
);
1420 dev
->dev_flags
= device_flags
;
1421 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1422 dev
->dev_ptr
= transport_dev
;
1424 dev
->se_sub_dev
= se_dev
;
1425 dev
->transport
= transport
;
1426 atomic_set(&dev
->active_cmds
, 0);
1427 INIT_LIST_HEAD(&dev
->dev_list
);
1428 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1429 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1430 INIT_LIST_HEAD(&dev
->execute_task_list
);
1431 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1432 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1433 INIT_LIST_HEAD(&dev
->state_task_list
);
1434 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1435 spin_lock_init(&dev
->execute_task_lock
);
1436 spin_lock_init(&dev
->delayed_cmd_lock
);
1437 spin_lock_init(&dev
->ordered_cmd_lock
);
1438 spin_lock_init(&dev
->state_task_lock
);
1439 spin_lock_init(&dev
->dev_alua_lock
);
1440 spin_lock_init(&dev
->dev_reservation_lock
);
1441 spin_lock_init(&dev
->dev_status_lock
);
1442 spin_lock_init(&dev
->dev_status_thr_lock
);
1443 spin_lock_init(&dev
->se_port_lock
);
1444 spin_lock_init(&dev
->se_tmr_lock
);
1445 spin_lock_init(&dev
->qf_cmd_lock
);
1447 dev
->queue_depth
= dev_limits
->queue_depth
;
1448 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1449 atomic_set(&dev
->dev_ordered_id
, 0);
1451 se_dev_set_default_attribs(dev
, dev_limits
);
1453 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1454 dev
->creation_time
= get_jiffies_64();
1455 spin_lock_init(&dev
->stats_lock
);
1457 spin_lock(&hba
->device_lock
);
1458 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1460 spin_unlock(&hba
->device_lock
);
1462 * Setup the SAM Task Attribute emulation for struct se_device
1464 core_setup_task_attr_emulation(dev
);
1466 * Force PR and ALUA passthrough emulation with internal object use.
1468 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1470 * Setup the Reservations infrastructure for struct se_device
1472 core_setup_reservations(dev
, force_pt
);
1474 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1476 if (core_setup_alua(dev
, force_pt
) < 0)
1480 * Startup the struct se_device processing thread
1482 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1483 "LIO_%s", dev
->transport
->name
);
1484 if (IS_ERR(dev
->process_thread
)) {
1485 pr_err("Unable to create kthread: LIO_%s\n",
1486 dev
->transport
->name
);
1490 * Setup work_queue for QUEUE_FULL
1492 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1494 * Preload the initial INQUIRY const values if we are doing
1495 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1496 * passthrough because this is being provided by the backend LLD.
1497 * This is required so that transport_get_inquiry() copies these
1498 * originals once back into DEV_T10_WWN(dev) for the virtual device
1501 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1502 if (!inquiry_prod
|| !inquiry_rev
) {
1503 pr_err("All non TCM/pSCSI plugins require"
1504 " INQUIRY consts\n");
1508 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1509 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1510 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1512 scsi_dump_inquiry(dev
);
1516 kthread_stop(dev
->process_thread
);
1518 spin_lock(&hba
->device_lock
);
1519 list_del(&dev
->dev_list
);
1521 spin_unlock(&hba
->device_lock
);
1523 se_release_vpd_for_dev(dev
);
1529 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1531 /* transport_generic_prepare_cdb():
1533 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1534 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1535 * The point of this is since we are mapping iSCSI LUNs to
1536 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1537 * devices and HBAs for a loop.
1539 static inline void transport_generic_prepare_cdb(
1543 case READ_10
: /* SBC - RDProtect */
1544 case READ_12
: /* SBC - RDProtect */
1545 case READ_16
: /* SBC - RDProtect */
1546 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1547 case VERIFY
: /* SBC - VRProtect */
1548 case VERIFY_16
: /* SBC - VRProtect */
1549 case WRITE_VERIFY
: /* SBC - VRProtect */
1550 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1553 cdb
[1] &= 0x1f; /* clear logical unit number */
1558 static struct se_task
*
1559 transport_generic_get_task(struct se_cmd
*cmd
,
1560 enum dma_data_direction data_direction
)
1562 struct se_task
*task
;
1563 struct se_device
*dev
= cmd
->se_dev
;
1565 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1567 pr_err("Unable to allocate struct se_task\n");
1571 INIT_LIST_HEAD(&task
->t_list
);
1572 INIT_LIST_HEAD(&task
->t_execute_list
);
1573 INIT_LIST_HEAD(&task
->t_state_list
);
1574 init_completion(&task
->task_stop_comp
);
1575 task
->task_se_cmd
= cmd
;
1577 task
->task_data_direction
= data_direction
;
1582 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1585 * Used by fabric modules containing a local struct se_cmd within their
1586 * fabric dependent per I/O descriptor.
1588 void transport_init_se_cmd(
1590 struct target_core_fabric_ops
*tfo
,
1591 struct se_session
*se_sess
,
1595 unsigned char *sense_buffer
)
1597 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1598 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1599 INIT_LIST_HEAD(&cmd
->se_ordered_node
);
1600 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1602 INIT_LIST_HEAD(&cmd
->t_task_list
);
1603 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1604 init_completion(&cmd
->transport_lun_stop_comp
);
1605 init_completion(&cmd
->t_transport_stop_comp
);
1606 spin_lock_init(&cmd
->t_state_lock
);
1607 atomic_set(&cmd
->transport_dev_active
, 1);
1610 cmd
->se_sess
= se_sess
;
1611 cmd
->data_length
= data_length
;
1612 cmd
->data_direction
= data_direction
;
1613 cmd
->sam_task_attr
= task_attr
;
1614 cmd
->sense_buffer
= sense_buffer
;
1616 EXPORT_SYMBOL(transport_init_se_cmd
);
1618 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1621 * Check if SAM Task Attribute emulation is enabled for this
1622 * struct se_device storage object
1624 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1627 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1628 pr_debug("SAM Task Attribute ACA"
1629 " emulation is not supported\n");
1633 * Used to determine when ORDERED commands should go from
1634 * Dormant to Active status.
1636 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1637 smp_mb__after_atomic_inc();
1638 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1639 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1640 cmd
->se_dev
->transport
->name
);
1644 void transport_free_se_cmd(
1645 struct se_cmd
*se_cmd
)
1647 if (se_cmd
->se_tmr_req
)
1648 core_tmr_release_req(se_cmd
->se_tmr_req
);
1650 * Check and free any extended CDB buffer that was allocated
1652 if (se_cmd
->t_task_cdb
!= se_cmd
->__t_task_cdb
)
1653 kfree(se_cmd
->t_task_cdb
);
1655 EXPORT_SYMBOL(transport_free_se_cmd
);
1657 static void transport_generic_wait_for_tasks(struct se_cmd
*, int, int);
1659 /* transport_generic_allocate_tasks():
1661 * Called from fabric RX Thread.
1663 int transport_generic_allocate_tasks(
1669 transport_generic_prepare_cdb(cdb
);
1672 * This is needed for early exceptions.
1674 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1677 * Ensure that the received CDB is less than the max (252 + 8) bytes
1678 * for VARIABLE_LENGTH_CMD
1680 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1681 pr_err("Received SCSI CDB with command_size: %d that"
1682 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1683 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1687 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1688 * allocate the additional extended CDB buffer now.. Otherwise
1689 * setup the pointer from __t_task_cdb to t_task_cdb.
1691 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1692 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1694 if (!cmd
->t_task_cdb
) {
1695 pr_err("Unable to allocate cmd->t_task_cdb"
1696 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1697 scsi_command_size(cdb
),
1698 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1702 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1704 * Copy the original CDB into cmd->
1706 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1708 * Setup the received CDB based on SCSI defined opcodes and
1709 * perform unit attention, persistent reservations and ALUA
1710 * checks for virtual device backends. The cmd->t_task_cdb
1711 * pointer is expected to be setup before we reach this point.
1713 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1717 * Check for SAM Task Attribute Emulation
1719 if (transport_check_alloc_task_attr(cmd
) < 0) {
1720 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1721 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1724 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1725 if (cmd
->se_lun
->lun_sep
)
1726 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1727 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1730 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1733 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1734 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1736 int transport_generic_handle_cdb(
1741 pr_err("cmd->se_lun is NULL\n");
1745 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD
);
1748 EXPORT_SYMBOL(transport_generic_handle_cdb
);
1751 * Used by fabric module frontends to queue tasks directly.
1752 * Many only be used from process context only
1754 int transport_handle_cdb_direct(
1759 pr_err("cmd->se_lun is NULL\n");
1762 if (in_interrupt()) {
1764 pr_err("transport_generic_handle_cdb cannot be called"
1765 " from interrupt context\n");
1769 return transport_generic_new_cmd(cmd
);
1771 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1774 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1775 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1776 * complete setup in TCM process context w/ TFO->new_cmd_map().
1778 int transport_generic_handle_cdb_map(
1783 pr_err("cmd->se_lun is NULL\n");
1787 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
);
1790 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1792 /* transport_generic_handle_data():
1796 int transport_generic_handle_data(
1800 * For the software fabric case, then we assume the nexus is being
1801 * failed/shutdown when signals are pending from the kthread context
1802 * caller, so we return a failure. For the HW target mode case running
1803 * in interrupt code, the signal_pending() check is skipped.
1805 if (!in_interrupt() && signal_pending(current
))
1808 * If the received CDB has aleady been ABORTED by the generic
1809 * target engine, we now call transport_check_aborted_status()
1810 * to queue any delated TASK_ABORTED status for the received CDB to the
1811 * fabric module as we are expecting no further incoming DATA OUT
1812 * sequences at this point.
1814 if (transport_check_aborted_status(cmd
, 1) != 0)
1817 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
);
1820 EXPORT_SYMBOL(transport_generic_handle_data
);
1822 /* transport_generic_handle_tmr():
1826 int transport_generic_handle_tmr(
1830 * This is needed for early exceptions.
1832 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1834 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
);
1837 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1839 void transport_generic_free_cmd_intr(
1842 transport_add_cmd_to_queue(cmd
, TRANSPORT_FREE_CMD_INTR
);
1844 EXPORT_SYMBOL(transport_generic_free_cmd_intr
);
1846 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1848 struct se_task
*task
, *task_tmp
;
1849 unsigned long flags
;
1852 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1853 cmd
->se_tfo
->get_task_tag(cmd
));
1856 * No tasks remain in the execution queue
1858 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1859 list_for_each_entry_safe(task
, task_tmp
,
1860 &cmd
->t_task_list
, t_list
) {
1861 pr_debug("task_no[%d] - Processing task %p\n",
1862 task
->task_no
, task
);
1864 * If the struct se_task has not been sent and is not active,
1865 * remove the struct se_task from the execution queue.
1867 if (!atomic_read(&task
->task_sent
) &&
1868 !atomic_read(&task
->task_active
)) {
1869 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1871 transport_remove_task_from_execute_queue(task
,
1874 pr_debug("task_no[%d] - Removed from execute queue\n",
1876 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1881 * If the struct se_task is active, sleep until it is returned
1884 if (atomic_read(&task
->task_active
)) {
1885 atomic_set(&task
->task_stop
, 1);
1886 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1889 pr_debug("task_no[%d] - Waiting to complete\n",
1891 wait_for_completion(&task
->task_stop_comp
);
1892 pr_debug("task_no[%d] - Stopped successfully\n",
1895 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1896 atomic_dec(&cmd
->t_task_cdbs_left
);
1898 atomic_set(&task
->task_active
, 0);
1899 atomic_set(&task
->task_stop
, 0);
1901 pr_debug("task_no[%d] - Did nothing\n", task
->task_no
);
1905 __transport_stop_task_timer(task
, &flags
);
1907 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1913 * Handle SAM-esque emulation for generic transport request failures.
1915 static void transport_generic_request_failure(
1917 struct se_device
*dev
,
1923 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1924 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1925 cmd
->t_task_cdb
[0]);
1926 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1927 " %d/%d transport_error_status: %d\n",
1928 cmd
->se_tfo
->get_cmd_state(cmd
),
1929 cmd
->t_state
, cmd
->deferred_t_state
,
1930 cmd
->transport_error_status
);
1931 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1932 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1933 " t_transport_active: %d t_transport_stop: %d"
1934 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1935 atomic_read(&cmd
->t_task_cdbs_left
),
1936 atomic_read(&cmd
->t_task_cdbs_sent
),
1937 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1938 atomic_read(&cmd
->t_transport_active
),
1939 atomic_read(&cmd
->t_transport_stop
),
1940 atomic_read(&cmd
->t_transport_sent
));
1942 transport_stop_all_task_timers(cmd
);
1945 atomic_inc(&dev
->depth_left
);
1947 * For SAM Task Attribute emulation for failed struct se_cmd
1949 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1950 transport_complete_task_attr(cmd
);
1953 transport_direct_request_timeout(cmd
);
1954 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1957 switch (cmd
->transport_error_status
) {
1958 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1959 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1961 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1962 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1964 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1965 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1967 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1968 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1970 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1972 transport_new_cmd_failure(cmd
);
1974 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1975 * we force this session to fall back to session
1978 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
1979 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
1982 case PYX_TRANSPORT_LU_COMM_FAILURE
:
1983 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
1984 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1986 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
1987 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
1989 case PYX_TRANSPORT_WRITE_PROTECTED
:
1990 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
1992 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
1994 * No SENSE Data payload for this case, set SCSI Status
1995 * and queue the response to $FABRIC_MOD.
1997 * Uses linux/include/scsi/scsi.h SAM status codes defs
1999 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2001 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2002 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2005 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2008 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2009 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2010 cmd
->orig_fe_lun
, 0x2C,
2011 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2013 ret
= cmd
->se_tfo
->queue_status(cmd
);
2017 case PYX_TRANSPORT_USE_SENSE_REASON
:
2019 * struct se_cmd->scsi_sense_reason already set
2023 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
2025 cmd
->transport_error_status
);
2026 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
2031 transport_new_cmd_failure(cmd
);
2033 ret
= transport_send_check_condition_and_sense(cmd
,
2034 cmd
->scsi_sense_reason
, 0);
2040 transport_lun_remove_cmd(cmd
);
2041 if (!transport_cmd_check_stop_to_fabric(cmd
))
2046 cmd
->t_state
= TRANSPORT_COMPLETE_OK
;
2047 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
2050 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
2052 unsigned long flags
;
2054 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2055 if (!atomic_read(&cmd
->t_transport_timeout
)) {
2056 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2059 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
2060 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2064 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
2066 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2069 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
2071 unsigned long flags
;
2074 * Reset cmd->t_se_count to allow transport_generic_remove()
2075 * to allow last call to free memory resources.
2077 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2078 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
2079 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
2081 atomic_sub(tmp
, &cmd
->t_se_count
);
2083 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2085 transport_generic_remove(cmd
, 0);
2088 static inline u32
transport_lba_21(unsigned char *cdb
)
2090 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2093 static inline u32
transport_lba_32(unsigned char *cdb
)
2095 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2098 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2100 unsigned int __v1
, __v2
;
2102 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2103 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2105 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2109 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2111 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2113 unsigned int __v1
, __v2
;
2115 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2116 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2118 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2121 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2123 unsigned long flags
;
2125 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2126 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2127 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2131 * Called from interrupt context.
2133 static void transport_task_timeout_handler(unsigned long data
)
2135 struct se_task
*task
= (struct se_task
*)data
;
2136 struct se_cmd
*cmd
= task
->task_se_cmd
;
2137 unsigned long flags
;
2139 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2141 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2142 if (task
->task_flags
& TF_STOP
) {
2143 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2146 task
->task_flags
&= ~TF_RUNNING
;
2149 * Determine if transport_complete_task() has already been called.
2151 if (!atomic_read(&task
->task_active
)) {
2152 pr_debug("transport task: %p cmd: %p timeout task_active"
2153 " == 0\n", task
, cmd
);
2154 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2158 atomic_inc(&cmd
->t_se_count
);
2159 atomic_inc(&cmd
->t_transport_timeout
);
2160 cmd
->t_tasks_failed
= 1;
2162 atomic_set(&task
->task_timeout
, 1);
2163 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2164 task
->task_scsi_status
= 1;
2166 if (atomic_read(&task
->task_stop
)) {
2167 pr_debug("transport task: %p cmd: %p timeout task_stop"
2168 " == 1\n", task
, cmd
);
2169 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2170 complete(&task
->task_stop_comp
);
2174 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2175 pr_debug("transport task: %p cmd: %p timeout non zero"
2176 " t_task_cdbs_left\n", task
, cmd
);
2177 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2180 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2183 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2184 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2186 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
);
2190 * Called with cmd->t_state_lock held.
2192 static void transport_start_task_timer(struct se_task
*task
)
2194 struct se_device
*dev
= task
->se_dev
;
2197 if (task
->task_flags
& TF_RUNNING
)
2200 * If the task_timeout is disabled, exit now.
2202 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2206 init_timer(&task
->task_timer
);
2207 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2208 task
->task_timer
.data
= (unsigned long) task
;
2209 task
->task_timer
.function
= transport_task_timeout_handler
;
2211 task
->task_flags
|= TF_RUNNING
;
2212 add_timer(&task
->task_timer
);
2214 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2215 " %d\n", task
->task_se_cmd
, task
, timeout
);
2220 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2222 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2224 struct se_cmd
*cmd
= task
->task_se_cmd
;
2226 if (!task
->task_flags
& TF_RUNNING
)
2229 task
->task_flags
|= TF_STOP
;
2230 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
2232 del_timer_sync(&task
->task_timer
);
2234 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
2235 task
->task_flags
&= ~TF_RUNNING
;
2236 task
->task_flags
&= ~TF_STOP
;
2239 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2241 struct se_task
*task
= NULL
, *task_tmp
;
2242 unsigned long flags
;
2244 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2245 list_for_each_entry_safe(task
, task_tmp
,
2246 &cmd
->t_task_list
, t_list
)
2247 __transport_stop_task_timer(task
, &flags
);
2248 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2251 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2253 if (dev
->dev_tcq_window_closed
++ <
2254 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2255 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2257 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2259 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2264 * Called from Fabric Module context from transport_execute_tasks()
2266 * The return of this function determins if the tasks from struct se_cmd
2267 * get added to the execution queue in transport_execute_tasks(),
2268 * or are added to the delayed or ordered lists here.
2270 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2272 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2275 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2276 * to allow the passed struct se_cmd list of tasks to the front of the list.
2278 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2279 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2280 smp_mb__after_atomic_inc();
2281 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2282 " 0x%02x, se_ordered_id: %u\n",
2284 cmd
->se_ordered_id
);
2286 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2287 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2288 list_add_tail(&cmd
->se_ordered_node
,
2289 &cmd
->se_dev
->ordered_cmd_list
);
2290 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2292 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2293 smp_mb__after_atomic_inc();
2295 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2296 " list, se_ordered_id: %u\n",
2298 cmd
->se_ordered_id
);
2300 * Add ORDERED command to tail of execution queue if
2301 * no other older commands exist that need to be
2304 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2308 * For SIMPLE and UNTAGGED Task Attribute commands
2310 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2311 smp_mb__after_atomic_inc();
2314 * Otherwise if one or more outstanding ORDERED task attribute exist,
2315 * add the dormant task(s) built for the passed struct se_cmd to the
2316 * execution queue and become in Active state for this struct se_device.
2318 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2320 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2321 * will be drained upon completion of HEAD_OF_QUEUE task.
2323 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2324 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2325 list_add_tail(&cmd
->se_delayed_node
,
2326 &cmd
->se_dev
->delayed_cmd_list
);
2327 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2329 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2330 " delayed CMD list, se_ordered_id: %u\n",
2331 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2332 cmd
->se_ordered_id
);
2334 * Return zero to let transport_execute_tasks() know
2335 * not to add the delayed tasks to the execution list.
2340 * Otherwise, no ORDERED task attributes exist..
2346 * Called from fabric module context in transport_generic_new_cmd() and
2347 * transport_generic_process_write()
2349 static int transport_execute_tasks(struct se_cmd
*cmd
)
2353 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2354 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2355 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2360 * Call transport_cmd_check_stop() to see if a fabric exception
2361 * has occurred that prevents execution.
2363 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2365 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2366 * attribute for the tasks of the received struct se_cmd CDB
2368 add_tasks
= transport_execute_task_attr(cmd
);
2372 * This calls transport_add_tasks_from_cmd() to handle
2373 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2374 * (if enabled) in __transport_add_task_to_execute_queue() and
2375 * transport_add_task_check_sam_attr().
2377 transport_add_tasks_from_cmd(cmd
);
2380 * Kick the execution queue for the cmd associated struct se_device
2384 __transport_execute_tasks(cmd
->se_dev
);
2389 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2390 * from struct se_device->execute_task_list and
2392 * Called from transport_processing_thread()
2394 static int __transport_execute_tasks(struct se_device
*dev
)
2397 struct se_cmd
*cmd
= NULL
;
2398 struct se_task
*task
= NULL
;
2399 unsigned long flags
;
2402 * Check if there is enough room in the device and HBA queue to send
2403 * struct se_tasks to the selected transport.
2406 if (!atomic_read(&dev
->depth_left
))
2407 return transport_tcq_window_closed(dev
);
2409 dev
->dev_tcq_window_closed
= 0;
2411 spin_lock_irq(&dev
->execute_task_lock
);
2412 if (list_empty(&dev
->execute_task_list
)) {
2413 spin_unlock_irq(&dev
->execute_task_lock
);
2416 task
= list_first_entry(&dev
->execute_task_list
,
2417 struct se_task
, t_execute_list
);
2418 list_del(&task
->t_execute_list
);
2419 atomic_set(&task
->task_execute_queue
, 0);
2420 atomic_dec(&dev
->execute_tasks
);
2421 spin_unlock_irq(&dev
->execute_task_lock
);
2423 atomic_dec(&dev
->depth_left
);
2425 cmd
= task
->task_se_cmd
;
2427 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2428 atomic_set(&task
->task_active
, 1);
2429 atomic_set(&task
->task_sent
, 1);
2430 atomic_inc(&cmd
->t_task_cdbs_sent
);
2432 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2433 cmd
->t_task_list_num
)
2434 atomic_set(&cmd
->transport_sent
, 1);
2436 transport_start_task_timer(task
);
2437 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2439 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2440 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2441 * struct se_subsystem_api->do_task() caller below.
2443 if (cmd
->transport_emulate_cdb
) {
2444 error
= cmd
->transport_emulate_cdb(cmd
);
2446 cmd
->transport_error_status
= error
;
2447 atomic_set(&task
->task_active
, 0);
2448 atomic_set(&cmd
->transport_sent
, 0);
2449 transport_stop_tasks_for_cmd(cmd
);
2450 transport_generic_request_failure(cmd
, dev
, 0, 1);
2454 * Handle the successful completion for transport_emulate_cdb()
2455 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2456 * Otherwise the caller is expected to complete the task with
2459 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2460 cmd
->scsi_status
= SAM_STAT_GOOD
;
2461 task
->task_scsi_status
= GOOD
;
2462 transport_complete_task(task
, 1);
2466 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2467 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2468 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2469 * LUN emulation code.
2471 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2472 * call ->do_task() directly and let the underlying TCM subsystem plugin
2473 * code handle the CDB emulation.
2475 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2476 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2477 error
= transport_emulate_control_cdb(task
);
2479 error
= dev
->transport
->do_task(task
);
2482 cmd
->transport_error_status
= error
;
2483 atomic_set(&task
->task_active
, 0);
2484 atomic_set(&cmd
->transport_sent
, 0);
2485 transport_stop_tasks_for_cmd(cmd
);
2486 transport_generic_request_failure(cmd
, dev
, 0, 1);
2495 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2497 unsigned long flags
;
2499 * Any unsolicited data will get dumped for failed command inside of
2502 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2503 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2504 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2505 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2508 static void transport_nop_wait_for_tasks(struct se_cmd
*, int, int);
2510 static inline u32
transport_get_sectors_6(
2515 struct se_device
*dev
= cmd
->se_dev
;
2518 * Assume TYPE_DISK for non struct se_device objects.
2519 * Use 8-bit sector value.
2525 * Use 24-bit allocation length for TYPE_TAPE.
2527 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2528 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2531 * Everything else assume TYPE_DISK Sector CDB location.
2532 * Use 8-bit sector value.
2538 static inline u32
transport_get_sectors_10(
2543 struct se_device
*dev
= cmd
->se_dev
;
2546 * Assume TYPE_DISK for non struct se_device objects.
2547 * Use 16-bit sector value.
2553 * XXX_10 is not defined in SSC, throw an exception
2555 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2561 * Everything else assume TYPE_DISK Sector CDB location.
2562 * Use 16-bit sector value.
2565 return (u32
)(cdb
[7] << 8) + cdb
[8];
2568 static inline u32
transport_get_sectors_12(
2573 struct se_device
*dev
= cmd
->se_dev
;
2576 * Assume TYPE_DISK for non struct se_device objects.
2577 * Use 32-bit sector value.
2583 * XXX_12 is not defined in SSC, throw an exception
2585 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2591 * Everything else assume TYPE_DISK Sector CDB location.
2592 * Use 32-bit sector value.
2595 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2598 static inline u32
transport_get_sectors_16(
2603 struct se_device
*dev
= cmd
->se_dev
;
2606 * Assume TYPE_DISK for non struct se_device objects.
2607 * Use 32-bit sector value.
2613 * Use 24-bit allocation length for TYPE_TAPE.
2615 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2616 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2619 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2620 (cdb
[12] << 8) + cdb
[13];
2624 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2626 static inline u32
transport_get_sectors_32(
2632 * Assume TYPE_DISK for non struct se_device objects.
2633 * Use 32-bit sector value.
2635 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2636 (cdb
[30] << 8) + cdb
[31];
2640 static inline u32
transport_get_size(
2645 struct se_device
*dev
= cmd
->se_dev
;
2647 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2648 if (cdb
[1] & 1) { /* sectors */
2649 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2654 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2655 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2656 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2657 dev
->transport
->name
);
2659 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2662 static void transport_xor_callback(struct se_cmd
*cmd
)
2664 unsigned char *buf
, *addr
;
2665 struct scatterlist
*sg
;
2666 unsigned int offset
;
2670 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2672 * 1) read the specified logical block(s);
2673 * 2) transfer logical blocks from the data-out buffer;
2674 * 3) XOR the logical blocks transferred from the data-out buffer with
2675 * the logical blocks read, storing the resulting XOR data in a buffer;
2676 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2677 * blocks transferred from the data-out buffer; and
2678 * 5) transfer the resulting XOR data to the data-in buffer.
2680 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2682 pr_err("Unable to allocate xor_callback buf\n");
2686 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2687 * into the locally allocated *buf
2689 sg_copy_to_buffer(cmd
->t_data_sg
,
2695 * Now perform the XOR against the BIDI read memory located at
2696 * cmd->t_mem_bidi_list
2700 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2701 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2705 for (i
= 0; i
< sg
->length
; i
++)
2706 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2708 offset
+= sg
->length
;
2709 kunmap_atomic(addr
, KM_USER0
);
2717 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2719 static int transport_get_sense_data(struct se_cmd
*cmd
)
2721 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2722 struct se_device
*dev
;
2723 struct se_task
*task
= NULL
, *task_tmp
;
2724 unsigned long flags
;
2727 WARN_ON(!cmd
->se_lun
);
2729 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2730 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2731 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2735 list_for_each_entry_safe(task
, task_tmp
,
2736 &cmd
->t_task_list
, t_list
) {
2738 if (!task
->task_sense
)
2745 if (!dev
->transport
->get_sense_buffer
) {
2746 pr_err("dev->transport->get_sense_buffer"
2751 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2752 if (!sense_buffer
) {
2753 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
2754 " sense buffer for task with sense\n",
2755 cmd
->se_tfo
->get_task_tag(cmd
), task
->task_no
);
2758 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2760 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2761 TRANSPORT_SENSE_BUFFER
);
2763 memcpy(&buffer
[offset
], sense_buffer
,
2764 TRANSPORT_SENSE_BUFFER
);
2765 cmd
->scsi_status
= task
->task_scsi_status
;
2766 /* Automatically padded */
2767 cmd
->scsi_sense_length
=
2768 (TRANSPORT_SENSE_BUFFER
+ offset
);
2770 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2772 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2776 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2782 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2784 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
2785 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2786 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2787 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2789 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2790 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2793 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2796 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2797 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2798 cmd
->orig_fe_lun
, 0x2C,
2799 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2803 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2805 return dev
->transport
->get_blocks(dev
) + 1;
2808 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2810 struct se_device
*dev
= cmd
->se_dev
;
2813 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2816 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2818 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2819 pr_err("LBA: %llu Sectors: %u exceeds"
2820 " transport_dev_end_lba(): %llu\n",
2821 cmd
->t_task_lba
, sectors
,
2822 transport_dev_end_lba(dev
));
2823 pr_err(" We should return CHECK_CONDITION"
2824 " but we don't yet\n");
2831 /* transport_generic_cmd_sequencer():
2833 * Generic Command Sequencer that should work for most DAS transport
2836 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2839 * FIXME: Need to support other SCSI OPCODES where as well.
2841 static int transport_generic_cmd_sequencer(
2845 struct se_device
*dev
= cmd
->se_dev
;
2846 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2847 int ret
= 0, sector_ret
= 0, passthrough
;
2848 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2852 * Check for an existing UNIT ATTENTION condition
2854 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2855 cmd
->transport_wait_for_tasks
=
2856 &transport_nop_wait_for_tasks
;
2857 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2858 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2862 * Check status of Asymmetric Logical Unit Assignment port
2864 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2866 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
2868 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2869 * The ALUA additional sense code qualifier (ASCQ) is determined
2870 * by the ALUA primary or secondary access state..
2874 pr_debug("[%s]: ALUA TG Port not available,"
2875 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2876 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2878 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2879 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2880 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2883 goto out_invalid_cdb_field
;
2886 * Check status for SPC-3 Persistent Reservations
2888 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2889 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2890 cmd
, cdb
, pr_reg_type
) != 0)
2891 return transport_handle_reservation_conflict(cmd
);
2893 * This means the CDB is allowed for the SCSI Initiator port
2894 * when said port is *NOT* holding the legacy SPC-2 or
2895 * SPC-3 Persistent Reservation.
2901 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2903 goto out_unsupported_cdb
;
2904 size
= transport_get_size(sectors
, cdb
, cmd
);
2905 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2906 cmd
->t_task_lba
= transport_lba_21(cdb
);
2907 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2910 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2912 goto out_unsupported_cdb
;
2913 size
= transport_get_size(sectors
, cdb
, cmd
);
2914 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2915 cmd
->t_task_lba
= transport_lba_32(cdb
);
2916 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2919 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2921 goto out_unsupported_cdb
;
2922 size
= transport_get_size(sectors
, cdb
, cmd
);
2923 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2924 cmd
->t_task_lba
= transport_lba_32(cdb
);
2925 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2928 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2930 goto out_unsupported_cdb
;
2931 size
= transport_get_size(sectors
, cdb
, cmd
);
2932 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
2933 cmd
->t_task_lba
= transport_lba_64(cdb
);
2934 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2937 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2939 goto out_unsupported_cdb
;
2940 size
= transport_get_size(sectors
, cdb
, cmd
);
2941 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2942 cmd
->t_task_lba
= transport_lba_21(cdb
);
2943 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2946 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2948 goto out_unsupported_cdb
;
2949 size
= transport_get_size(sectors
, cdb
, cmd
);
2950 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2951 cmd
->t_task_lba
= transport_lba_32(cdb
);
2952 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2953 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2956 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2958 goto out_unsupported_cdb
;
2959 size
= transport_get_size(sectors
, cdb
, cmd
);
2960 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2961 cmd
->t_task_lba
= transport_lba_32(cdb
);
2962 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2963 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2966 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2968 goto out_unsupported_cdb
;
2969 size
= transport_get_size(sectors
, cdb
, cmd
);
2970 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
2971 cmd
->t_task_lba
= transport_lba_64(cdb
);
2972 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2973 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2975 case XDWRITEREAD_10
:
2976 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2977 !(cmd
->t_tasks_bidi
))
2978 goto out_invalid_cdb_field
;
2979 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2981 goto out_unsupported_cdb
;
2982 size
= transport_get_size(sectors
, cdb
, cmd
);
2983 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2984 cmd
->t_task_lba
= transport_lba_32(cdb
);
2985 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2986 passthrough
= (dev
->transport
->transport_type
==
2987 TRANSPORT_PLUGIN_PHBA_PDEV
);
2989 * Skip the remaining assignments for TCM/PSCSI passthrough
2994 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2996 cmd
->transport_complete_callback
= &transport_xor_callback
;
2997 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2999 case VARIABLE_LENGTH_CMD
:
3000 service_action
= get_unaligned_be16(&cdb
[8]);
3002 * Determine if this is TCM/PSCSI device and we should disable
3003 * internal emulation for this CDB.
3005 passthrough
= (dev
->transport
->transport_type
==
3006 TRANSPORT_PLUGIN_PHBA_PDEV
);
3008 switch (service_action
) {
3009 case XDWRITEREAD_32
:
3010 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3012 goto out_unsupported_cdb
;
3013 size
= transport_get_size(sectors
, cdb
, cmd
);
3015 * Use WRITE_32 and READ_32 opcodes for the emulated
3016 * XDWRITE_READ_32 logic.
3018 cmd
->transport_split_cdb
= &split_cdb_XX_32
;
3019 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
3020 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3023 * Skip the remaining assignments for TCM/PSCSI passthrough
3029 * Setup BIDI XOR callback to be run during
3030 * transport_generic_complete_ok()
3032 cmd
->transport_complete_callback
= &transport_xor_callback
;
3033 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
3036 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3038 goto out_unsupported_cdb
;
3041 size
= transport_get_size(sectors
, cdb
, cmd
);
3043 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3045 goto out_invalid_cdb_field
;
3048 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
3049 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3052 * Skip the remaining assignments for TCM/PSCSI passthrough
3057 if ((cdb
[10] & 0x04) || (cdb
[10] & 0x02)) {
3058 pr_err("WRITE_SAME PBDATA and LBDATA"
3059 " bits not supported for Block Discard"
3061 goto out_invalid_cdb_field
;
3064 * Currently for the emulated case we only accept
3065 * tpws with the UNMAP=1 bit set.
3067 if (!(cdb
[10] & 0x08)) {
3068 pr_err("WRITE_SAME w/o UNMAP bit not"
3069 " supported for Block Discard Emulation\n");
3070 goto out_invalid_cdb_field
;
3074 pr_err("VARIABLE_LENGTH_CMD service action"
3075 " 0x%04x not supported\n", service_action
);
3076 goto out_unsupported_cdb
;
3079 case MAINTENANCE_IN
:
3080 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3081 /* MAINTENANCE_IN from SCC-2 */
3083 * Check for emulated MI_REPORT_TARGET_PGS.
3085 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
3086 cmd
->transport_emulate_cdb
=
3087 (su_dev
->t10_alua
.alua_type
==
3088 SPC3_ALUA_EMULATED
) ?
3089 core_emulate_report_target_port_groups
:
3092 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3093 (cdb
[8] << 8) | cdb
[9];
3095 /* GPCMD_SEND_KEY from multi media commands */
3096 size
= (cdb
[8] << 8) + cdb
[9];
3098 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3102 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3104 case MODE_SELECT_10
:
3105 size
= (cdb
[7] << 8) + cdb
[8];
3106 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3110 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3113 case GPCMD_READ_BUFFER_CAPACITY
:
3114 case GPCMD_SEND_OPC
:
3117 size
= (cdb
[7] << 8) + cdb
[8];
3118 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3120 case READ_BLOCK_LIMITS
:
3121 size
= READ_BLOCK_LEN
;
3122 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3124 case GPCMD_GET_CONFIGURATION
:
3125 case GPCMD_READ_FORMAT_CAPACITIES
:
3126 case GPCMD_READ_DISC_INFO
:
3127 case GPCMD_READ_TRACK_RZONE_INFO
:
3128 size
= (cdb
[7] << 8) + cdb
[8];
3129 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3131 case PERSISTENT_RESERVE_IN
:
3132 case PERSISTENT_RESERVE_OUT
:
3133 cmd
->transport_emulate_cdb
=
3134 (su_dev
->t10_pr
.res_type
==
3135 SPC3_PERSISTENT_RESERVATIONS
) ?
3136 core_scsi3_emulate_pr
: NULL
;
3137 size
= (cdb
[7] << 8) + cdb
[8];
3138 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3140 case GPCMD_MECHANISM_STATUS
:
3141 case GPCMD_READ_DVD_STRUCTURE
:
3142 size
= (cdb
[8] << 8) + cdb
[9];
3143 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3146 size
= READ_POSITION_LEN
;
3147 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3149 case MAINTENANCE_OUT
:
3150 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3151 /* MAINTENANCE_OUT from SCC-2
3153 * Check for emulated MO_SET_TARGET_PGS.
3155 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3156 cmd
->transport_emulate_cdb
=
3157 (su_dev
->t10_alua
.alua_type
==
3158 SPC3_ALUA_EMULATED
) ?
3159 core_emulate_set_target_port_groups
:
3163 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3164 (cdb
[8] << 8) | cdb
[9];
3166 /* GPCMD_REPORT_KEY from multi media commands */
3167 size
= (cdb
[8] << 8) + cdb
[9];
3169 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3172 size
= (cdb
[3] << 8) + cdb
[4];
3174 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3175 * See spc4r17 section 5.3
3177 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3178 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3179 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3182 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3183 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3186 size
= READ_CAP_LEN
;
3187 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3189 case READ_MEDIA_SERIAL_NUMBER
:
3190 case SECURITY_PROTOCOL_IN
:
3191 case SECURITY_PROTOCOL_OUT
:
3192 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3193 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3195 case SERVICE_ACTION_IN
:
3196 case ACCESS_CONTROL_IN
:
3197 case ACCESS_CONTROL_OUT
:
3199 case READ_ATTRIBUTE
:
3200 case RECEIVE_COPY_RESULTS
:
3201 case WRITE_ATTRIBUTE
:
3202 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3203 (cdb
[12] << 8) | cdb
[13];
3204 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3206 case RECEIVE_DIAGNOSTIC
:
3207 case SEND_DIAGNOSTIC
:
3208 size
= (cdb
[3] << 8) | cdb
[4];
3209 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3211 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3214 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3215 size
= (2336 * sectors
);
3216 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3221 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3225 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3227 case READ_ELEMENT_STATUS
:
3228 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3229 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3232 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3233 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3238 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3239 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3241 if (cdb
[0] == RESERVE_10
)
3242 size
= (cdb
[7] << 8) | cdb
[8];
3244 size
= cmd
->data_length
;
3247 * Setup the legacy emulated handler for SPC-2 and
3248 * >= SPC-3 compatible reservation handling (CRH=1)
3249 * Otherwise, we assume the underlying SCSI logic is
3250 * is running in SPC_PASSTHROUGH, and wants reservations
3251 * emulation disabled.
3253 cmd
->transport_emulate_cdb
=
3254 (su_dev
->t10_pr
.res_type
!=
3256 core_scsi2_emulate_crh
: NULL
;
3257 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3262 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3263 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3265 if (cdb
[0] == RELEASE_10
)
3266 size
= (cdb
[7] << 8) | cdb
[8];
3268 size
= cmd
->data_length
;
3270 cmd
->transport_emulate_cdb
=
3271 (su_dev
->t10_pr
.res_type
!=
3273 core_scsi2_emulate_crh
: NULL
;
3274 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3276 case SYNCHRONIZE_CACHE
:
3277 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3279 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3281 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3282 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3283 cmd
->t_task_lba
= transport_lba_32(cdb
);
3285 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3286 cmd
->t_task_lba
= transport_lba_64(cdb
);
3289 goto out_unsupported_cdb
;
3291 size
= transport_get_size(sectors
, cdb
, cmd
);
3292 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3295 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3297 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3300 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3301 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3303 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3305 * Check to ensure that LBA + Range does not exceed past end of
3308 if (!transport_cmd_get_valid_sectors(cmd
))
3309 goto out_invalid_cdb_field
;
3312 size
= get_unaligned_be16(&cdb
[7]);
3313 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3316 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3318 goto out_unsupported_cdb
;
3321 size
= transport_get_size(sectors
, cdb
, cmd
);
3323 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3324 goto out_invalid_cdb_field
;
3327 cmd
->t_task_lba
= get_unaligned_be16(&cdb
[2]);
3328 passthrough
= (dev
->transport
->transport_type
==
3329 TRANSPORT_PLUGIN_PHBA_PDEV
);
3331 * Determine if the received WRITE_SAME_16 is used to for direct
3332 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3333 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3334 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3335 * TCM/FILEIO subsystem plugin backstores.
3338 if ((cdb
[1] & 0x04) || (cdb
[1] & 0x02)) {
3339 pr_err("WRITE_SAME PBDATA and LBDATA"
3340 " bits not supported for Block Discard"
3342 goto out_invalid_cdb_field
;
3345 * Currently for the emulated case we only accept
3346 * tpws with the UNMAP=1 bit set.
3348 if (!(cdb
[1] & 0x08)) {
3349 pr_err("WRITE_SAME w/o UNMAP bit not "
3350 " supported for Block Discard Emulation\n");
3351 goto out_invalid_cdb_field
;
3354 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3356 case ALLOW_MEDIUM_REMOVAL
:
3357 case GPCMD_CLOSE_TRACK
:
3359 case INITIALIZE_ELEMENT_STATUS
:
3360 case GPCMD_LOAD_UNLOAD
:
3363 case GPCMD_SET_SPEED
:
3366 case TEST_UNIT_READY
:
3368 case WRITE_FILEMARKS
:
3370 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3373 cmd
->transport_emulate_cdb
=
3374 transport_core_report_lun_response
;
3375 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3377 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3378 * See spc4r17 section 5.3
3380 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3381 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3382 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3385 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3386 " 0x%02x, sending CHECK_CONDITION.\n",
3387 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3388 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3389 goto out_unsupported_cdb
;
3392 if (size
!= cmd
->data_length
) {
3393 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3394 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3395 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3396 cmd
->data_length
, size
, cdb
[0]);
3398 cmd
->cmd_spdtl
= size
;
3400 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3401 pr_err("Rejecting underflow/overflow"
3403 goto out_invalid_cdb_field
;
3406 * Reject READ_* or WRITE_* with overflow/underflow for
3407 * type SCF_SCSI_DATA_SG_IO_CDB.
3409 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3410 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3411 " CDB on non 512-byte sector setup subsystem"
3412 " plugin: %s\n", dev
->transport
->name
);
3413 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3414 goto out_invalid_cdb_field
;
3417 if (size
> cmd
->data_length
) {
3418 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3419 cmd
->residual_count
= (size
- cmd
->data_length
);
3421 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3422 cmd
->residual_count
= (cmd
->data_length
- size
);
3424 cmd
->data_length
= size
;
3427 /* Let's limit control cdbs to a page, for simplicity's sake. */
3428 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3430 goto out_invalid_cdb_field
;
3432 transport_set_supported_SAM_opcode(cmd
);
3435 out_unsupported_cdb
:
3436 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3437 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3439 out_invalid_cdb_field
:
3440 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3441 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3446 * Called from transport_generic_complete_ok() and
3447 * transport_generic_request_failure() to determine which dormant/delayed
3448 * and ordered cmds need to have their tasks added to the execution queue.
3450 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3452 struct se_device
*dev
= cmd
->se_dev
;
3453 struct se_cmd
*cmd_p
, *cmd_tmp
;
3454 int new_active_tasks
= 0;
3456 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3457 atomic_dec(&dev
->simple_cmds
);
3458 smp_mb__after_atomic_dec();
3459 dev
->dev_cur_ordered_id
++;
3460 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3461 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3462 cmd
->se_ordered_id
);
3463 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3464 atomic_dec(&dev
->dev_hoq_count
);
3465 smp_mb__after_atomic_dec();
3466 dev
->dev_cur_ordered_id
++;
3467 pr_debug("Incremented dev_cur_ordered_id: %u for"
3468 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3469 cmd
->se_ordered_id
);
3470 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3471 spin_lock(&dev
->ordered_cmd_lock
);
3472 list_del(&cmd
->se_ordered_node
);
3473 atomic_dec(&dev
->dev_ordered_sync
);
3474 smp_mb__after_atomic_dec();
3475 spin_unlock(&dev
->ordered_cmd_lock
);
3477 dev
->dev_cur_ordered_id
++;
3478 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3479 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3482 * Process all commands up to the last received
3483 * ORDERED task attribute which requires another blocking
3486 spin_lock(&dev
->delayed_cmd_lock
);
3487 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3488 &dev
->delayed_cmd_list
, se_delayed_node
) {
3490 list_del(&cmd_p
->se_delayed_node
);
3491 spin_unlock(&dev
->delayed_cmd_lock
);
3493 pr_debug("Calling add_tasks() for"
3494 " cmd_p: 0x%02x Task Attr: 0x%02x"
3495 " Dormant -> Active, se_ordered_id: %u\n",
3496 cmd_p
->t_task_cdb
[0],
3497 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3499 transport_add_tasks_from_cmd(cmd_p
);
3502 spin_lock(&dev
->delayed_cmd_lock
);
3503 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3506 spin_unlock(&dev
->delayed_cmd_lock
);
3508 * If new tasks have become active, wake up the transport thread
3509 * to do the processing of the Active tasks.
3511 if (new_active_tasks
!= 0)
3512 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3515 static int transport_complete_qf(struct se_cmd
*cmd
)
3519 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
3520 return cmd
->se_tfo
->queue_status(cmd
);
3522 switch (cmd
->data_direction
) {
3523 case DMA_FROM_DEVICE
:
3524 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3527 if (cmd
->t_bidi_data_sg
) {
3528 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3532 /* Fall through for DMA_TO_DEVICE */
3534 ret
= cmd
->se_tfo
->queue_status(cmd
);
3543 static void transport_handle_queue_full(
3545 struct se_device
*dev
,
3546 int (*qf_callback
)(struct se_cmd
*))
3548 spin_lock_irq(&dev
->qf_cmd_lock
);
3549 cmd
->se_cmd_flags
|= SCF_EMULATE_QUEUE_FULL
;
3550 cmd
->transport_qf_callback
= qf_callback
;
3551 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3552 atomic_inc(&dev
->dev_qf_count
);
3553 smp_mb__after_atomic_inc();
3554 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3556 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3559 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3561 int reason
= 0, ret
;
3563 * Check if we need to move delayed/dormant tasks from cmds on the
3564 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3567 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3568 transport_complete_task_attr(cmd
);
3570 * Check to schedule QUEUE_FULL work, or execute an existing
3571 * cmd->transport_qf_callback()
3573 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3574 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3576 if (cmd
->transport_qf_callback
) {
3577 ret
= cmd
->transport_qf_callback(cmd
);
3581 cmd
->transport_qf_callback
= NULL
;
3585 * Check if we need to retrieve a sense buffer from
3586 * the struct se_cmd in question.
3588 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3589 if (transport_get_sense_data(cmd
) < 0)
3590 reason
= TCM_NON_EXISTENT_LUN
;
3593 * Only set when an struct se_task->task_scsi_status returned
3594 * a non GOOD status.
3596 if (cmd
->scsi_status
) {
3597 ret
= transport_send_check_condition_and_sense(
3602 transport_lun_remove_cmd(cmd
);
3603 transport_cmd_check_stop_to_fabric(cmd
);
3608 * Check for a callback, used by amongst other things
3609 * XDWRITE_READ_10 emulation.
3611 if (cmd
->transport_complete_callback
)
3612 cmd
->transport_complete_callback(cmd
);
3614 switch (cmd
->data_direction
) {
3615 case DMA_FROM_DEVICE
:
3616 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3617 if (cmd
->se_lun
->lun_sep
) {
3618 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3621 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3623 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3628 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3629 if (cmd
->se_lun
->lun_sep
) {
3630 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3633 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3635 * Check if we need to send READ payload for BIDI-COMMAND
3637 if (cmd
->t_bidi_data_sg
) {
3638 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3639 if (cmd
->se_lun
->lun_sep
) {
3640 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3643 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3644 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3649 /* Fall through for DMA_TO_DEVICE */
3651 ret
= cmd
->se_tfo
->queue_status(cmd
);
3660 transport_lun_remove_cmd(cmd
);
3661 transport_cmd_check_stop_to_fabric(cmd
);
3665 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3666 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3667 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
3670 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3672 struct se_task
*task
, *task_tmp
;
3673 unsigned long flags
;
3675 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3676 list_for_each_entry_safe(task
, task_tmp
,
3677 &cmd
->t_task_list
, t_list
) {
3678 if (atomic_read(&task
->task_active
))
3681 kfree(task
->task_sg_bidi
);
3682 kfree(task
->task_sg
);
3684 list_del(&task
->t_list
);
3686 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3688 task
->se_dev
->transport
->free_task(task
);
3690 pr_err("task[%u] - task->se_dev is NULL\n",
3692 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3694 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3697 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3699 struct scatterlist
*sg
;
3702 for_each_sg(sgl
, sg
, nents
, count
)
3703 __free_page(sg_page(sg
));
3708 static inline void transport_free_pages(struct se_cmd
*cmd
)
3710 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3713 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3714 cmd
->t_data_sg
= NULL
;
3715 cmd
->t_data_nents
= 0;
3717 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3718 cmd
->t_bidi_data_sg
= NULL
;
3719 cmd
->t_bidi_data_nents
= 0;
3722 static inline void transport_release_tasks(struct se_cmd
*cmd
)
3724 transport_free_dev_tasks(cmd
);
3727 static inline int transport_dec_and_check(struct se_cmd
*cmd
)
3729 unsigned long flags
;
3731 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3732 if (atomic_read(&cmd
->t_fe_count
)) {
3733 if (!atomic_dec_and_test(&cmd
->t_fe_count
)) {
3734 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3740 if (atomic_read(&cmd
->t_se_count
)) {
3741 if (!atomic_dec_and_test(&cmd
->t_se_count
)) {
3742 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3747 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3752 static void transport_release_fe_cmd(struct se_cmd
*cmd
)
3754 unsigned long flags
;
3756 if (transport_dec_and_check(cmd
))
3759 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3760 if (!atomic_read(&cmd
->transport_dev_active
)) {
3761 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3764 atomic_set(&cmd
->transport_dev_active
, 0);
3765 transport_all_task_dev_remove_state(cmd
);
3766 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3768 transport_release_tasks(cmd
);
3770 transport_free_pages(cmd
);
3771 transport_free_se_cmd(cmd
);
3772 cmd
->se_tfo
->release_cmd(cmd
);
3776 transport_generic_remove(struct se_cmd
*cmd
, int session_reinstatement
)
3778 unsigned long flags
;
3780 if (transport_dec_and_check(cmd
)) {
3781 if (session_reinstatement
) {
3782 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3783 transport_all_task_dev_remove_state(cmd
);
3784 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3790 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3791 if (!atomic_read(&cmd
->transport_dev_active
)) {
3792 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3795 atomic_set(&cmd
->transport_dev_active
, 0);
3796 transport_all_task_dev_remove_state(cmd
);
3797 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3799 transport_release_tasks(cmd
);
3802 transport_free_pages(cmd
);
3803 transport_release_cmd(cmd
);
3808 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3809 * allocating in the core.
3810 * @cmd: Associated se_cmd descriptor
3811 * @mem: SGL style memory for TCM WRITE / READ
3812 * @sg_mem_num: Number of SGL elements
3813 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3814 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3816 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3819 int transport_generic_map_mem_to_cmd(
3821 struct scatterlist
*sgl
,
3823 struct scatterlist
*sgl_bidi
,
3826 if (!sgl
|| !sgl_count
)
3829 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3830 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3832 cmd
->t_data_sg
= sgl
;
3833 cmd
->t_data_nents
= sgl_count
;
3835 if (sgl_bidi
&& sgl_bidi_count
) {
3836 cmd
->t_bidi_data_sg
= sgl_bidi
;
3837 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3839 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3844 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3846 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
3848 struct se_device
*dev
= cmd
->se_dev
;
3854 * Setup any BIDI READ tasks and memory from
3855 * cmd->t_mem_bidi_list so the READ struct se_tasks
3856 * are queued first for the non pSCSI passthrough case.
3858 if (cmd
->t_bidi_data_sg
&&
3859 (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
3860 rc
= transport_allocate_tasks(cmd
,
3863 cmd
->t_bidi_data_sg
,
3864 cmd
->t_bidi_data_nents
);
3866 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3867 cmd
->scsi_sense_reason
=
3868 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3869 return PYX_TRANSPORT_LU_COMM_FAILURE
;
3871 atomic_inc(&cmd
->t_fe_count
);
3872 atomic_inc(&cmd
->t_se_count
);
3876 * Setup the tasks and memory from cmd->t_mem_list
3877 * Note for BIDI transfers this will contain the WRITE payload
3879 task_cdbs
= transport_allocate_tasks(cmd
,
3881 cmd
->data_direction
,
3884 if (task_cdbs
<= 0) {
3885 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3886 cmd
->scsi_sense_reason
=
3887 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3888 return PYX_TRANSPORT_LU_COMM_FAILURE
;
3892 atomic_inc(&cmd
->t_fe_count
);
3893 atomic_inc(&cmd
->t_se_count
);
3896 cmd
->t_task_list_num
= task_cdbs
;
3898 atomic_set(&cmd
->t_task_cdbs_left
, task_cdbs
);
3899 atomic_set(&cmd
->t_task_cdbs_ex_left
, task_cdbs
);
3900 atomic_set(&cmd
->t_task_cdbs_timeout_left
, task_cdbs
);
3904 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3906 struct scatterlist
*sg
= cmd
->t_data_sg
;
3910 * We need to take into account a possible offset here for fabrics like
3911 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3912 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3914 return kmap(sg_page(sg
)) + sg
->offset
;
3916 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3918 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3920 kunmap(sg_page(cmd
->t_data_sg
));
3922 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3925 transport_generic_get_mem(struct se_cmd
*cmd
)
3927 u32 length
= cmd
->data_length
;
3932 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3933 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3934 if (!cmd
->t_data_sg
)
3937 cmd
->t_data_nents
= nents
;
3938 sg_init_table(cmd
->t_data_sg
, nents
);
3941 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3942 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3946 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3954 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3957 kfree(cmd
->t_data_sg
);
3958 cmd
->t_data_sg
= NULL
;
3962 /* Reduce sectors if they are too long for the device */
3963 static inline sector_t
transport_limit_task_sectors(
3964 struct se_device
*dev
,
3965 unsigned long long lba
,
3968 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3970 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3971 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3972 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3979 * This function can be used by HW target mode drivers to create a linked
3980 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3981 * This is intended to be called during the completion path by TCM Core
3982 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3984 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3986 struct scatterlist
*sg_first
= NULL
;
3987 struct scatterlist
*sg_prev
= NULL
;
3988 int sg_prev_nents
= 0;
3989 struct scatterlist
*sg
;
3990 struct se_task
*task
;
3991 u32 chained_nents
= 0;
3994 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3997 * Walk the struct se_task list and setup scatterlist chains
3998 * for each contiguously allocated struct se_task->task_sg[].
4000 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
4004 BUG_ON(!task
->task_padded_sg
);
4007 sg_first
= task
->task_sg
;
4008 chained_nents
= task
->task_sg_nents
;
4010 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
4011 chained_nents
+= task
->task_sg_nents
;
4014 sg_prev
= task
->task_sg
;
4015 sg_prev_nents
= task
->task_sg_nents
;
4018 * Setup the starting pointer and total t_tasks_sg_linked_no including
4019 * padding SGs for linking and to mark the end.
4021 cmd
->t_tasks_sg_chained
= sg_first
;
4022 cmd
->t_tasks_sg_chained_no
= chained_nents
;
4024 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
4025 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
4026 cmd
->t_tasks_sg_chained_no
);
4028 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
4029 cmd
->t_tasks_sg_chained_no
, i
) {
4031 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
4032 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
4033 if (sg_is_chain(sg
))
4034 pr_debug("SG: %p sg_is_chain=1\n", sg
);
4036 pr_debug("SG: %p sg_is_last=1\n", sg
);
4039 EXPORT_SYMBOL(transport_do_task_sg_chain
);
4042 * Break up cmd into chunks transport can handle
4044 static int transport_allocate_data_tasks(
4046 unsigned long long lba
,
4047 enum dma_data_direction data_direction
,
4048 struct scatterlist
*sgl
,
4049 unsigned int sgl_nents
)
4051 unsigned char *cdb
= NULL
;
4052 struct se_task
*task
;
4053 struct se_device
*dev
= cmd
->se_dev
;
4054 unsigned long flags
;
4055 int task_count
, i
, ret
;
4056 sector_t sectors
, dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
4057 u32 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
4058 struct scatterlist
*sg
;
4059 struct scatterlist
*cmd_sg
;
4061 WARN_ON(cmd
->data_length
% sector_size
);
4062 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
4063 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
4066 for (i
= 0; i
< task_count
; i
++) {
4067 unsigned int task_size
;
4070 task
= transport_generic_get_task(cmd
, data_direction
);
4074 task
->task_lba
= lba
;
4075 task
->task_sectors
= min(sectors
, dev_max_sectors
);
4076 task
->task_size
= task
->task_sectors
* sector_size
;
4078 cdb
= dev
->transport
->get_cdb(task
);
4081 memcpy(cdb
, cmd
->t_task_cdb
,
4082 scsi_command_size(cmd
->t_task_cdb
));
4084 /* Update new cdb with updated lba/sectors */
4085 cmd
->transport_split_cdb(task
->task_lba
, task
->task_sectors
, cdb
);
4088 * Check if the fabric module driver is requesting that all
4089 * struct se_task->task_sg[] be chained together.. If so,
4090 * then allocate an extra padding SG entry for linking and
4091 * marking the end of the chained SGL.
4092 * Possibly over-allocate task sgl size by using cmd sgl size.
4093 * It's so much easier and only a waste when task_count > 1.
4094 * That is extremely rare.
4096 task
->task_sg_nents
= sgl_nents
;
4097 if (cmd
->se_tfo
->task_sg_chaining
) {
4098 task
->task_sg_nents
++;
4099 task
->task_padded_sg
= 1;
4102 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
4103 task
->task_sg_nents
, GFP_KERNEL
);
4104 if (!task
->task_sg
) {
4105 cmd
->se_dev
->transport
->free_task(task
);
4109 sg_init_table(task
->task_sg
, task
->task_sg_nents
);
4111 task_size
= task
->task_size
;
4113 /* Build new sgl, only up to task_size */
4114 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
4115 if (cmd_sg
->length
> task_size
)
4119 task_size
-= cmd_sg
->length
;
4120 cmd_sg
= sg_next(cmd_sg
);
4123 lba
+= task
->task_sectors
;
4124 sectors
-= task
->task_sectors
;
4126 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4127 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4128 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4131 * Now perform the memory map of task->task_sg[] into backend
4132 * subsystem memory..
4134 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
4135 if (atomic_read(&task
->task_sent
))
4137 if (!dev
->transport
->map_data_SG
)
4140 ret
= dev
->transport
->map_data_SG(task
);
4149 transport_allocate_control_task(struct se_cmd
*cmd
)
4151 struct se_device
*dev
= cmd
->se_dev
;
4153 struct se_task
*task
;
4154 unsigned long flags
;
4157 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
4161 cdb
= dev
->transport
->get_cdb(task
);
4163 memcpy(cdb
, cmd
->t_task_cdb
,
4164 scsi_command_size(cmd
->t_task_cdb
));
4166 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
4168 if (!task
->task_sg
) {
4169 cmd
->se_dev
->transport
->free_task(task
);
4173 memcpy(task
->task_sg
, cmd
->t_data_sg
,
4174 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
4175 task
->task_size
= cmd
->data_length
;
4176 task
->task_sg_nents
= cmd
->t_data_nents
;
4178 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4179 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4180 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4182 if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) {
4183 if (dev
->transport
->map_control_SG
)
4184 ret
= dev
->transport
->map_control_SG(task
);
4185 } else if (cmd
->se_cmd_flags
& SCF_SCSI_NON_DATA_CDB
) {
4186 if (dev
->transport
->cdb_none
)
4187 ret
= dev
->transport
->cdb_none(task
);
4189 pr_err("target: Unknown control cmd type!\n");
4193 /* Success! Return number of tasks allocated */
4199 static u32
transport_allocate_tasks(
4201 unsigned long long lba
,
4202 enum dma_data_direction data_direction
,
4203 struct scatterlist
*sgl
,
4204 unsigned int sgl_nents
)
4206 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)
4207 return transport_allocate_data_tasks(cmd
, lba
, data_direction
,
4210 return transport_allocate_control_task(cmd
);
4215 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4217 * Allocate storage transport resources from a set of values predefined
4218 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4219 * Any non zero return here is treated as an "out of resource' op here.
4222 * Generate struct se_task(s) and/or their payloads for this CDB.
4224 int transport_generic_new_cmd(struct se_cmd
*cmd
)
4229 * Determine is the TCM fabric module has already allocated physical
4230 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4233 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
4235 ret
= transport_generic_get_mem(cmd
);
4240 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4241 * control or data CDB types, and perform the map to backend subsystem
4242 * code from SGL memory allocated here by transport_generic_get_mem(), or
4243 * via pre-existing SGL memory setup explictly by fabric module code with
4244 * transport_generic_map_mem_to_cmd().
4246 ret
= transport_new_cmd_obj(cmd
);
4250 * For WRITEs, let the fabric know its buffer is ready..
4251 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4252 * will be added to the struct se_device execution queue after its WRITE
4253 * data has arrived. (ie: It gets handled by the transport processing
4254 * thread a second time)
4256 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4257 transport_add_tasks_to_state_queue(cmd
);
4258 return transport_generic_write_pending(cmd
);
4261 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4262 * to the execution queue.
4264 transport_execute_tasks(cmd
);
4267 EXPORT_SYMBOL(transport_generic_new_cmd
);
4269 /* transport_generic_process_write():
4273 void transport_generic_process_write(struct se_cmd
*cmd
)
4275 transport_execute_tasks(cmd
);
4277 EXPORT_SYMBOL(transport_generic_process_write
);
4279 static int transport_write_pending_qf(struct se_cmd
*cmd
)
4281 return cmd
->se_tfo
->write_pending(cmd
);
4284 /* transport_generic_write_pending():
4288 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4290 unsigned long flags
;
4293 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4294 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4295 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4297 if (cmd
->transport_qf_callback
) {
4298 ret
= cmd
->transport_qf_callback(cmd
);
4304 cmd
->transport_qf_callback
= NULL
;
4309 * Clear the se_cmd for WRITE_PENDING status in order to set
4310 * cmd->t_transport_active=0 so that transport_generic_handle_data
4311 * can be called from HW target mode interrupt code. This is safe
4312 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4313 * because the se_cmd->se_lun pointer is not being cleared.
4315 transport_cmd_check_stop(cmd
, 1, 0);
4318 * Call the fabric write_pending function here to let the
4319 * frontend know that WRITE buffers are ready.
4321 ret
= cmd
->se_tfo
->write_pending(cmd
);
4327 return PYX_TRANSPORT_WRITE_PENDING
;
4330 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4331 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4332 transport_handle_queue_full(cmd
, cmd
->se_dev
,
4333 transport_write_pending_qf
);
4337 void transport_release_cmd(struct se_cmd
*cmd
)
4339 BUG_ON(!cmd
->se_tfo
);
4341 transport_free_se_cmd(cmd
);
4342 cmd
->se_tfo
->release_cmd(cmd
);
4344 EXPORT_SYMBOL(transport_release_cmd
);
4346 /* transport_generic_free_cmd():
4348 * Called from processing frontend to release storage engine resources
4350 void transport_generic_free_cmd(
4353 int session_reinstatement
)
4355 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
))
4356 transport_release_cmd(cmd
);
4358 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4362 pr_debug("cmd: %p ITT: 0x%08x contains"
4363 " cmd->se_lun\n", cmd
,
4364 cmd
->se_tfo
->get_task_tag(cmd
));
4366 transport_lun_remove_cmd(cmd
);
4369 if (wait_for_tasks
&& cmd
->transport_wait_for_tasks
)
4370 cmd
->transport_wait_for_tasks(cmd
, 0, 0);
4372 transport_free_dev_tasks(cmd
);
4374 transport_generic_remove(cmd
, session_reinstatement
);
4377 EXPORT_SYMBOL(transport_generic_free_cmd
);
4379 static void transport_nop_wait_for_tasks(
4382 int session_reinstatement
)
4387 /* transport_lun_wait_for_tasks():
4389 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4390 * an struct se_lun to be successfully shutdown.
4392 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4394 unsigned long flags
;
4397 * If the frontend has already requested this struct se_cmd to
4398 * be stopped, we can safely ignore this struct se_cmd.
4400 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4401 if (atomic_read(&cmd
->t_transport_stop
)) {
4402 atomic_set(&cmd
->transport_lun_stop
, 0);
4403 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4404 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4405 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4406 transport_cmd_check_stop(cmd
, 1, 0);
4409 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4410 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4412 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4414 ret
= transport_stop_tasks_for_cmd(cmd
);
4416 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4417 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4419 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4420 cmd
->se_tfo
->get_task_tag(cmd
));
4421 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4422 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4423 cmd
->se_tfo
->get_task_tag(cmd
));
4425 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
4430 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4432 struct se_cmd
*cmd
= NULL
;
4433 unsigned long lun_flags
, cmd_flags
;
4435 * Do exception processing and return CHECK_CONDITION status to the
4438 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4439 while (!list_empty(&lun
->lun_cmd_list
)) {
4440 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4441 struct se_cmd
, se_lun_node
);
4442 list_del(&cmd
->se_lun_node
);
4444 atomic_set(&cmd
->transport_lun_active
, 0);
4446 * This will notify iscsi_target_transport.c:
4447 * transport_cmd_check_stop() that a LUN shutdown is in
4448 * progress for the iscsi_cmd_t.
4450 spin_lock(&cmd
->t_state_lock
);
4451 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4452 "_lun_stop for ITT: 0x%08x\n",
4453 cmd
->se_lun
->unpacked_lun
,
4454 cmd
->se_tfo
->get_task_tag(cmd
));
4455 atomic_set(&cmd
->transport_lun_stop
, 1);
4456 spin_unlock(&cmd
->t_state_lock
);
4458 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4461 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4462 cmd
->se_tfo
->get_task_tag(cmd
),
4463 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4467 * If the Storage engine still owns the iscsi_cmd_t, determine
4468 * and/or stop its context.
4470 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4471 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4472 cmd
->se_tfo
->get_task_tag(cmd
));
4474 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4475 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4479 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4480 "_wait_for_tasks(): SUCCESS\n",
4481 cmd
->se_lun
->unpacked_lun
,
4482 cmd
->se_tfo
->get_task_tag(cmd
));
4484 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4485 if (!atomic_read(&cmd
->transport_dev_active
)) {
4486 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4489 atomic_set(&cmd
->transport_dev_active
, 0);
4490 transport_all_task_dev_remove_state(cmd
);
4491 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4493 transport_free_dev_tasks(cmd
);
4495 * The Storage engine stopped this struct se_cmd before it was
4496 * send to the fabric frontend for delivery back to the
4497 * Initiator Node. Return this SCSI CDB back with an
4498 * CHECK_CONDITION status.
4501 transport_send_check_condition_and_sense(cmd
,
4502 TCM_NON_EXISTENT_LUN
, 0);
4504 * If the fabric frontend is waiting for this iscsi_cmd_t to
4505 * be released, notify the waiting thread now that LU has
4506 * finished accessing it.
4508 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4509 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4510 pr_debug("SE_LUN[%d] - Detected FE stop for"
4511 " struct se_cmd: %p ITT: 0x%08x\n",
4513 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4515 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4517 transport_cmd_check_stop(cmd
, 1, 0);
4518 complete(&cmd
->transport_lun_fe_stop_comp
);
4519 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4522 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4523 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4525 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4526 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4528 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4531 static int transport_clear_lun_thread(void *p
)
4533 struct se_lun
*lun
= (struct se_lun
*)p
;
4535 __transport_clear_lun_from_sessions(lun
);
4536 complete(&lun
->lun_shutdown_comp
);
4541 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4543 struct task_struct
*kt
;
4545 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4546 "tcm_cl_%u", lun
->unpacked_lun
);
4548 pr_err("Unable to start clear_lun thread\n");
4551 wait_for_completion(&lun
->lun_shutdown_comp
);
4556 /* transport_generic_wait_for_tasks():
4558 * Called from frontend or passthrough context to wait for storage engine
4559 * to pause and/or release frontend generated struct se_cmd.
4561 static void transport_generic_wait_for_tasks(
4564 int session_reinstatement
)
4566 unsigned long flags
;
4568 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
))
4571 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4573 * If we are already stopped due to an external event (ie: LUN shutdown)
4574 * sleep until the connection can have the passed struct se_cmd back.
4575 * The cmd->transport_lun_stopped_sem will be upped by
4576 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4577 * has completed its operation on the struct se_cmd.
4579 if (atomic_read(&cmd
->transport_lun_stop
)) {
4581 pr_debug("wait_for_tasks: Stopping"
4582 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4583 "_stop_comp); for ITT: 0x%08x\n",
4584 cmd
->se_tfo
->get_task_tag(cmd
));
4586 * There is a special case for WRITES where a FE exception +
4587 * LUN shutdown means ConfigFS context is still sleeping on
4588 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4589 * We go ahead and up transport_lun_stop_comp just to be sure
4592 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4593 complete(&cmd
->transport_lun_stop_comp
);
4594 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4595 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4597 transport_all_task_dev_remove_state(cmd
);
4599 * At this point, the frontend who was the originator of this
4600 * struct se_cmd, now owns the structure and can be released through
4601 * normal means below.
4603 pr_debug("wait_for_tasks: Stopped"
4604 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4605 "stop_comp); for ITT: 0x%08x\n",
4606 cmd
->se_tfo
->get_task_tag(cmd
));
4608 atomic_set(&cmd
->transport_lun_stop
, 0);
4610 if (!atomic_read(&cmd
->t_transport_active
) ||
4611 atomic_read(&cmd
->t_transport_aborted
))
4614 atomic_set(&cmd
->t_transport_stop
, 1);
4616 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4617 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4618 " = TRUE\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4619 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
,
4620 cmd
->deferred_t_state
);
4622 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4624 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4626 wait_for_completion(&cmd
->t_transport_stop_comp
);
4628 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4629 atomic_set(&cmd
->t_transport_active
, 0);
4630 atomic_set(&cmd
->t_transport_stop
, 0);
4632 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4633 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4634 cmd
->se_tfo
->get_task_tag(cmd
));
4636 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4640 transport_generic_free_cmd(cmd
, 0, session_reinstatement
);
4643 static int transport_get_sense_codes(
4648 *asc
= cmd
->scsi_asc
;
4649 *ascq
= cmd
->scsi_ascq
;
4654 static int transport_set_sense_codes(
4659 cmd
->scsi_asc
= asc
;
4660 cmd
->scsi_ascq
= ascq
;
4665 int transport_send_check_condition_and_sense(
4670 unsigned char *buffer
= cmd
->sense_buffer
;
4671 unsigned long flags
;
4673 u8 asc
= 0, ascq
= 0;
4675 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4676 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4677 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4680 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4681 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4683 if (!reason
&& from_transport
)
4686 if (!from_transport
)
4687 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4689 * Data Segment and SenseLength of the fabric response PDU.
4691 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4692 * from include/scsi/scsi_cmnd.h
4694 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4695 TRANSPORT_SENSE_BUFFER
);
4697 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4698 * SENSE KEY values from include/scsi/scsi.h
4701 case TCM_NON_EXISTENT_LUN
:
4702 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4703 case TCM_SECTOR_COUNT_TOO_MANY
:
4705 buffer
[offset
] = 0x70;
4706 /* ILLEGAL REQUEST */
4707 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4708 /* INVALID COMMAND OPERATION CODE */
4709 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4711 case TCM_UNKNOWN_MODE_PAGE
:
4713 buffer
[offset
] = 0x70;
4714 /* ILLEGAL REQUEST */
4715 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4716 /* INVALID FIELD IN CDB */
4717 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4719 case TCM_CHECK_CONDITION_ABORT_CMD
:
4721 buffer
[offset
] = 0x70;
4722 /* ABORTED COMMAND */
4723 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4724 /* BUS DEVICE RESET FUNCTION OCCURRED */
4725 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4726 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4728 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4730 buffer
[offset
] = 0x70;
4731 /* ABORTED COMMAND */
4732 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4734 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4735 /* NOT ENOUGH UNSOLICITED DATA */
4736 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4738 case TCM_INVALID_CDB_FIELD
:
4740 buffer
[offset
] = 0x70;
4741 /* ABORTED COMMAND */
4742 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4743 /* INVALID FIELD IN CDB */
4744 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4746 case TCM_INVALID_PARAMETER_LIST
:
4748 buffer
[offset
] = 0x70;
4749 /* ABORTED COMMAND */
4750 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4751 /* INVALID FIELD IN PARAMETER LIST */
4752 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4754 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4756 buffer
[offset
] = 0x70;
4757 /* ABORTED COMMAND */
4758 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4760 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4761 /* UNEXPECTED_UNSOLICITED_DATA */
4762 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4764 case TCM_SERVICE_CRC_ERROR
:
4766 buffer
[offset
] = 0x70;
4767 /* ABORTED COMMAND */
4768 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4769 /* PROTOCOL SERVICE CRC ERROR */
4770 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4772 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4774 case TCM_SNACK_REJECTED
:
4776 buffer
[offset
] = 0x70;
4777 /* ABORTED COMMAND */
4778 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4780 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4781 /* FAILED RETRANSMISSION REQUEST */
4782 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4784 case TCM_WRITE_PROTECTED
:
4786 buffer
[offset
] = 0x70;
4788 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4789 /* WRITE PROTECTED */
4790 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4792 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4794 buffer
[offset
] = 0x70;
4795 /* UNIT ATTENTION */
4796 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4797 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4798 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4799 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4801 case TCM_CHECK_CONDITION_NOT_READY
:
4803 buffer
[offset
] = 0x70;
4805 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4806 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4807 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4808 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4810 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4813 buffer
[offset
] = 0x70;
4814 /* ILLEGAL REQUEST */
4815 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4816 /* LOGICAL UNIT COMMUNICATION FAILURE */
4817 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4821 * This code uses linux/include/scsi/scsi.h SAM status codes!
4823 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4825 * Automatically padded, this value is encoded in the fabric's
4826 * data_length response PDU containing the SCSI defined sense data.
4828 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4831 return cmd
->se_tfo
->queue_status(cmd
);
4833 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4835 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4839 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4841 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4844 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4845 " status for CDB: 0x%02x ITT: 0x%08x\n",
4847 cmd
->se_tfo
->get_task_tag(cmd
));
4849 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4850 cmd
->se_tfo
->queue_status(cmd
);
4855 EXPORT_SYMBOL(transport_check_aborted_status
);
4857 void transport_send_task_abort(struct se_cmd
*cmd
)
4860 * If there are still expected incoming fabric WRITEs, we wait
4861 * until until they have completed before sending a TASK_ABORTED
4862 * response. This response with TASK_ABORTED status will be
4863 * queued back to fabric module by transport_check_aborted_status().
4865 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4866 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4867 atomic_inc(&cmd
->t_transport_aborted
);
4868 smp_mb__after_atomic_inc();
4869 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4870 transport_new_cmd_failure(cmd
);
4874 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4876 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4877 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4878 cmd
->se_tfo
->get_task_tag(cmd
));
4880 cmd
->se_tfo
->queue_status(cmd
);
4883 /* transport_generic_do_tmr():
4887 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4889 struct se_device
*dev
= cmd
->se_dev
;
4890 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4893 switch (tmr
->function
) {
4894 case TMR_ABORT_TASK
:
4895 tmr
->response
= TMR_FUNCTION_REJECTED
;
4897 case TMR_ABORT_TASK_SET
:
4899 case TMR_CLEAR_TASK_SET
:
4900 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4903 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4904 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4905 TMR_FUNCTION_REJECTED
;
4907 case TMR_TARGET_WARM_RESET
:
4908 tmr
->response
= TMR_FUNCTION_REJECTED
;
4910 case TMR_TARGET_COLD_RESET
:
4911 tmr
->response
= TMR_FUNCTION_REJECTED
;
4914 pr_err("Uknown TMR function: 0x%02x.\n",
4916 tmr
->response
= TMR_FUNCTION_REJECTED
;
4920 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4921 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4923 transport_cmd_check_stop(cmd
, 2, 0);
4928 * Called with spin_lock_irq(&dev->execute_task_lock); held
4931 static struct se_task
*
4932 transport_get_task_from_state_list(struct se_device
*dev
)
4934 struct se_task
*task
;
4936 if (list_empty(&dev
->state_task_list
))
4939 list_for_each_entry(task
, &dev
->state_task_list
, t_state_list
)
4942 list_del(&task
->t_state_list
);
4943 atomic_set(&task
->task_state_active
, 0);
4948 static void transport_processing_shutdown(struct se_device
*dev
)
4951 struct se_task
*task
;
4952 unsigned long flags
;
4954 * Empty the struct se_device's struct se_task state list.
4956 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
4957 while ((task
= transport_get_task_from_state_list(dev
))) {
4958 if (!task
->task_se_cmd
) {
4959 pr_err("task->task_se_cmd is NULL!\n");
4962 cmd
= task
->task_se_cmd
;
4964 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
4966 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4968 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
4969 " i_state: %d, t_state/def_t_state:"
4970 " %d/%d cdb: 0x%02x\n", cmd
, task
,
4971 cmd
->se_tfo
->get_task_tag(cmd
),
4972 cmd
->se_tfo
->get_cmd_state(cmd
),
4973 cmd
->t_state
, cmd
->deferred_t_state
,
4974 cmd
->t_task_cdb
[0]);
4975 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
4976 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
4977 " t_transport_stop: %d t_transport_sent: %d\n",
4978 cmd
->se_tfo
->get_task_tag(cmd
),
4979 cmd
->t_task_list_num
,
4980 atomic_read(&cmd
->t_task_cdbs_left
),
4981 atomic_read(&cmd
->t_task_cdbs_sent
),
4982 atomic_read(&cmd
->t_transport_active
),
4983 atomic_read(&cmd
->t_transport_stop
),
4984 atomic_read(&cmd
->t_transport_sent
));
4986 if (atomic_read(&task
->task_active
)) {
4987 atomic_set(&task
->task_stop
, 1);
4988 spin_unlock_irqrestore(
4989 &cmd
->t_state_lock
, flags
);
4991 pr_debug("Waiting for task: %p to shutdown for dev:"
4992 " %p\n", task
, dev
);
4993 wait_for_completion(&task
->task_stop_comp
);
4994 pr_debug("Completed task: %p shutdown for dev: %p\n",
4997 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4998 atomic_dec(&cmd
->t_task_cdbs_left
);
5000 atomic_set(&task
->task_active
, 0);
5001 atomic_set(&task
->task_stop
, 0);
5003 if (atomic_read(&task
->task_execute_queue
) != 0)
5004 transport_remove_task_from_execute_queue(task
, dev
);
5006 __transport_stop_task_timer(task
, &flags
);
5008 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_ex_left
)) {
5009 spin_unlock_irqrestore(
5010 &cmd
->t_state_lock
, flags
);
5012 pr_debug("Skipping task: %p, dev: %p for"
5013 " t_task_cdbs_ex_left: %d\n", task
, dev
,
5014 atomic_read(&cmd
->t_task_cdbs_ex_left
));
5016 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5020 if (atomic_read(&cmd
->t_transport_active
)) {
5021 pr_debug("got t_transport_active = 1 for task: %p, dev:"
5022 " %p\n", task
, dev
);
5024 if (atomic_read(&cmd
->t_fe_count
)) {
5025 spin_unlock_irqrestore(
5026 &cmd
->t_state_lock
, flags
);
5027 transport_send_check_condition_and_sense(
5028 cmd
, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
,
5030 transport_remove_cmd_from_queue(cmd
,
5031 &cmd
->se_dev
->dev_queue_obj
);
5033 transport_lun_remove_cmd(cmd
);
5034 transport_cmd_check_stop(cmd
, 1, 0);
5036 spin_unlock_irqrestore(
5037 &cmd
->t_state_lock
, flags
);
5039 transport_remove_cmd_from_queue(cmd
,
5040 &cmd
->se_dev
->dev_queue_obj
);
5042 transport_lun_remove_cmd(cmd
);
5044 if (transport_cmd_check_stop(cmd
, 1, 0))
5045 transport_generic_remove(cmd
, 0);
5048 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5051 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
5054 if (atomic_read(&cmd
->t_fe_count
)) {
5055 spin_unlock_irqrestore(
5056 &cmd
->t_state_lock
, flags
);
5057 transport_send_check_condition_and_sense(cmd
,
5058 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
5059 transport_remove_cmd_from_queue(cmd
,
5060 &cmd
->se_dev
->dev_queue_obj
);
5062 transport_lun_remove_cmd(cmd
);
5063 transport_cmd_check_stop(cmd
, 1, 0);
5065 spin_unlock_irqrestore(
5066 &cmd
->t_state_lock
, flags
);
5068 transport_remove_cmd_from_queue(cmd
,
5069 &cmd
->se_dev
->dev_queue_obj
);
5070 transport_lun_remove_cmd(cmd
);
5072 if (transport_cmd_check_stop(cmd
, 1, 0))
5073 transport_generic_remove(cmd
, 0);
5076 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5078 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
5080 * Empty the struct se_device's struct se_cmd list.
5082 while ((cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
))) {
5084 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5087 if (atomic_read(&cmd
->t_fe_count
)) {
5088 transport_send_check_condition_and_sense(cmd
,
5089 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
5091 transport_lun_remove_cmd(cmd
);
5092 transport_cmd_check_stop(cmd
, 1, 0);
5094 transport_lun_remove_cmd(cmd
);
5095 if (transport_cmd_check_stop(cmd
, 1, 0))
5096 transport_generic_remove(cmd
, 0);
5101 /* transport_processing_thread():
5105 static int transport_processing_thread(void *param
)
5109 struct se_device
*dev
= (struct se_device
*) param
;
5111 set_user_nice(current
, -20);
5113 while (!kthread_should_stop()) {
5114 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
5115 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
5116 kthread_should_stop());
5120 spin_lock_irq(&dev
->dev_status_lock
);
5121 if (dev
->dev_status
& TRANSPORT_DEVICE_SHUTDOWN
) {
5122 spin_unlock_irq(&dev
->dev_status_lock
);
5123 transport_processing_shutdown(dev
);
5126 spin_unlock_irq(&dev
->dev_status_lock
);
5129 __transport_execute_tasks(dev
);
5131 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
5135 switch (cmd
->t_state
) {
5136 case TRANSPORT_NEW_CMD_MAP
:
5137 if (!cmd
->se_tfo
->new_cmd_map
) {
5138 pr_err("cmd->se_tfo->new_cmd_map is"
5139 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5142 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
5144 cmd
->transport_error_status
= ret
;
5145 transport_generic_request_failure(cmd
, NULL
,
5146 0, (cmd
->data_direction
!=
5151 case TRANSPORT_NEW_CMD
:
5152 ret
= transport_generic_new_cmd(cmd
);
5156 cmd
->transport_error_status
= ret
;
5157 transport_generic_request_failure(cmd
, NULL
,
5158 0, (cmd
->data_direction
!=
5162 case TRANSPORT_PROCESS_WRITE
:
5163 transport_generic_process_write(cmd
);
5165 case TRANSPORT_COMPLETE_OK
:
5166 transport_stop_all_task_timers(cmd
);
5167 transport_generic_complete_ok(cmd
);
5169 case TRANSPORT_REMOVE
:
5170 transport_generic_remove(cmd
, 0);
5172 case TRANSPORT_FREE_CMD_INTR
:
5173 transport_generic_free_cmd(cmd
, 0, 0);
5175 case TRANSPORT_PROCESS_TMR
:
5176 transport_generic_do_tmr(cmd
);
5178 case TRANSPORT_COMPLETE_FAILURE
:
5179 transport_generic_request_failure(cmd
, NULL
, 1, 1);
5181 case TRANSPORT_COMPLETE_TIMEOUT
:
5182 transport_stop_all_task_timers(cmd
);
5183 transport_generic_request_timeout(cmd
);
5185 case TRANSPORT_COMPLETE_QF_WP
:
5186 transport_generic_write_pending(cmd
);
5189 pr_err("Unknown t_state: %d deferred_t_state:"
5190 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5191 " %u\n", cmd
->t_state
, cmd
->deferred_t_state
,
5192 cmd
->se_tfo
->get_task_tag(cmd
),
5193 cmd
->se_tfo
->get_cmd_state(cmd
),
5194 cmd
->se_lun
->unpacked_lun
);
5202 transport_release_all_cmds(dev
);
5203 dev
->process_thread
= NULL
;