1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
38 #include <linux/cdrom.h>
39 #include <asm/unaligned.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_tcq.h>
46 #include <target/target_core_base.h>
47 #include <target/target_core_device.h>
48 #include <target/target_core_tmr.h>
49 #include <target/target_core_tpg.h>
50 #include <target/target_core_transport.h>
51 #include <target/target_core_fabric_ops.h>
52 #include <target/target_core_configfs.h>
54 #include "target_core_alua.h"
55 #include "target_core_hba.h"
56 #include "target_core_pr.h"
57 #include "target_core_scdb.h"
58 #include "target_core_ua.h"
60 static int sub_api_initialized
;
62 static struct kmem_cache
*se_cmd_cache
;
63 static struct kmem_cache
*se_sess_cache
;
64 struct kmem_cache
*se_tmr_req_cache
;
65 struct kmem_cache
*se_ua_cache
;
66 struct kmem_cache
*t10_pr_reg_cache
;
67 struct kmem_cache
*t10_alua_lu_gp_cache
;
68 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
69 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
70 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
72 /* Used for transport_dev_get_map_*() */
73 typedef int (*map_func_t
)(struct se_task
*, u32
);
75 static int transport_generic_write_pending(struct se_cmd
*);
76 static int transport_processing_thread(void *param
);
77 static int __transport_execute_tasks(struct se_device
*dev
);
78 static void transport_complete_task_attr(struct se_cmd
*cmd
);
79 static int transport_complete_qf(struct se_cmd
*cmd
);
80 static void transport_handle_queue_full(struct se_cmd
*cmd
,
81 struct se_device
*dev
, int (*qf_callback
)(struct se_cmd
*));
82 static void transport_direct_request_timeout(struct se_cmd
*cmd
);
83 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
84 static u32
transport_allocate_tasks(struct se_cmd
*cmd
,
85 unsigned long long starting_lba
,
86 enum dma_data_direction data_direction
,
87 struct scatterlist
*sgl
, unsigned int nents
);
88 static int transport_generic_get_mem(struct se_cmd
*cmd
);
89 static int transport_generic_remove(struct se_cmd
*cmd
,
90 int session_reinstatement
);
91 static void transport_release_fe_cmd(struct se_cmd
*cmd
);
92 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
93 struct se_queue_obj
*qobj
);
94 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
95 static void transport_stop_all_task_timers(struct se_cmd
*cmd
);
97 int init_se_kmem_caches(void)
99 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
100 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
102 pr_err("kmem_cache_create for struct se_cmd failed\n");
105 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
106 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
108 if (!se_tmr_req_cache
) {
109 pr_err("kmem_cache_create() for struct se_tmr_req"
113 se_sess_cache
= kmem_cache_create("se_sess_cache",
114 sizeof(struct se_session
), __alignof__(struct se_session
),
116 if (!se_sess_cache
) {
117 pr_err("kmem_cache_create() for struct se_session"
121 se_ua_cache
= kmem_cache_create("se_ua_cache",
122 sizeof(struct se_ua
), __alignof__(struct se_ua
),
125 pr_err("kmem_cache_create() for struct se_ua failed\n");
128 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
129 sizeof(struct t10_pr_registration
),
130 __alignof__(struct t10_pr_registration
), 0, NULL
);
131 if (!t10_pr_reg_cache
) {
132 pr_err("kmem_cache_create() for struct t10_pr_registration"
136 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
137 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
139 if (!t10_alua_lu_gp_cache
) {
140 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
144 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
145 sizeof(struct t10_alua_lu_gp_member
),
146 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
147 if (!t10_alua_lu_gp_mem_cache
) {
148 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
152 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
153 sizeof(struct t10_alua_tg_pt_gp
),
154 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
155 if (!t10_alua_tg_pt_gp_cache
) {
156 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
160 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
161 "t10_alua_tg_pt_gp_mem_cache",
162 sizeof(struct t10_alua_tg_pt_gp_member
),
163 __alignof__(struct t10_alua_tg_pt_gp_member
),
165 if (!t10_alua_tg_pt_gp_mem_cache
) {
166 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
174 kmem_cache_destroy(se_cmd_cache
);
175 if (se_tmr_req_cache
)
176 kmem_cache_destroy(se_tmr_req_cache
);
178 kmem_cache_destroy(se_sess_cache
);
180 kmem_cache_destroy(se_ua_cache
);
181 if (t10_pr_reg_cache
)
182 kmem_cache_destroy(t10_pr_reg_cache
);
183 if (t10_alua_lu_gp_cache
)
184 kmem_cache_destroy(t10_alua_lu_gp_cache
);
185 if (t10_alua_lu_gp_mem_cache
)
186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
187 if (t10_alua_tg_pt_gp_cache
)
188 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
189 if (t10_alua_tg_pt_gp_mem_cache
)
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
194 void release_se_kmem_caches(void)
196 kmem_cache_destroy(se_cmd_cache
);
197 kmem_cache_destroy(se_tmr_req_cache
);
198 kmem_cache_destroy(se_sess_cache
);
199 kmem_cache_destroy(se_ua_cache
);
200 kmem_cache_destroy(t10_pr_reg_cache
);
201 kmem_cache_destroy(t10_alua_lu_gp_cache
);
202 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
203 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
207 /* This code ensures unique mib indexes are handed out. */
208 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
209 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
212 * Allocate a new row index for the entry type specified
214 u32
scsi_get_new_index(scsi_index_t type
)
218 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
220 spin_lock(&scsi_mib_index_lock
);
221 new_index
= ++scsi_mib_index
[type
];
222 spin_unlock(&scsi_mib_index_lock
);
227 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
229 atomic_set(&qobj
->queue_cnt
, 0);
230 INIT_LIST_HEAD(&qobj
->qobj_list
);
231 init_waitqueue_head(&qobj
->thread_wq
);
232 spin_lock_init(&qobj
->cmd_queue_lock
);
234 EXPORT_SYMBOL(transport_init_queue_obj
);
236 static int transport_subsystem_reqmods(void)
240 ret
= request_module("target_core_iblock");
242 pr_err("Unable to load target_core_iblock\n");
244 ret
= request_module("target_core_file");
246 pr_err("Unable to load target_core_file\n");
248 ret
= request_module("target_core_pscsi");
250 pr_err("Unable to load target_core_pscsi\n");
252 ret
= request_module("target_core_stgt");
254 pr_err("Unable to load target_core_stgt\n");
259 int transport_subsystem_check_init(void)
263 if (sub_api_initialized
)
266 * Request the loading of known TCM subsystem plugins..
268 ret
= transport_subsystem_reqmods();
272 sub_api_initialized
= 1;
276 struct se_session
*transport_init_session(void)
278 struct se_session
*se_sess
;
280 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
282 pr_err("Unable to allocate struct se_session from"
284 return ERR_PTR(-ENOMEM
);
286 INIT_LIST_HEAD(&se_sess
->sess_list
);
287 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
291 EXPORT_SYMBOL(transport_init_session
);
294 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
296 void __transport_register_session(
297 struct se_portal_group
*se_tpg
,
298 struct se_node_acl
*se_nacl
,
299 struct se_session
*se_sess
,
300 void *fabric_sess_ptr
)
302 unsigned char buf
[PR_REG_ISID_LEN
];
304 se_sess
->se_tpg
= se_tpg
;
305 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
307 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
309 * Only set for struct se_session's that will actually be moving I/O.
310 * eg: *NOT* discovery sessions.
314 * If the fabric module supports an ISID based TransportID,
315 * save this value in binary from the fabric I_T Nexus now.
317 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
318 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
319 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
320 &buf
[0], PR_REG_ISID_LEN
);
321 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
323 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
325 * The se_nacl->nacl_sess pointer will be set to the
326 * last active I_T Nexus for each struct se_node_acl.
328 se_nacl
->nacl_sess
= se_sess
;
330 list_add_tail(&se_sess
->sess_acl_list
,
331 &se_nacl
->acl_sess_list
);
332 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
334 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
336 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
337 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
339 EXPORT_SYMBOL(__transport_register_session
);
341 void transport_register_session(
342 struct se_portal_group
*se_tpg
,
343 struct se_node_acl
*se_nacl
,
344 struct se_session
*se_sess
,
345 void *fabric_sess_ptr
)
347 spin_lock_bh(&se_tpg
->session_lock
);
348 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
349 spin_unlock_bh(&se_tpg
->session_lock
);
351 EXPORT_SYMBOL(transport_register_session
);
353 void transport_deregister_session_configfs(struct se_session
*se_sess
)
355 struct se_node_acl
*se_nacl
;
358 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
360 se_nacl
= se_sess
->se_node_acl
;
362 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
363 list_del(&se_sess
->sess_acl_list
);
365 * If the session list is empty, then clear the pointer.
366 * Otherwise, set the struct se_session pointer from the tail
367 * element of the per struct se_node_acl active session list.
369 if (list_empty(&se_nacl
->acl_sess_list
))
370 se_nacl
->nacl_sess
= NULL
;
372 se_nacl
->nacl_sess
= container_of(
373 se_nacl
->acl_sess_list
.prev
,
374 struct se_session
, sess_acl_list
);
376 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
379 EXPORT_SYMBOL(transport_deregister_session_configfs
);
381 void transport_free_session(struct se_session
*se_sess
)
383 kmem_cache_free(se_sess_cache
, se_sess
);
385 EXPORT_SYMBOL(transport_free_session
);
387 void transport_deregister_session(struct se_session
*se_sess
)
389 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
390 struct se_node_acl
*se_nacl
;
394 transport_free_session(se_sess
);
398 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
399 list_del(&se_sess
->sess_list
);
400 se_sess
->se_tpg
= NULL
;
401 se_sess
->fabric_sess_ptr
= NULL
;
402 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
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_irqsave(&se_tpg
->acl_node_lock
, flags
);
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_irqrestore(&se_tpg
->acl_node_lock
, flags
);
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_irqsave(&se_tpg
->acl_node_lock
, flags
);
425 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
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 LIST_HEAD(qf_cmd_list
);
980 struct se_cmd
*cmd
, *cmd_tmp
;
982 spin_lock_irq(&dev
->qf_cmd_lock
);
983 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
984 spin_unlock_irq(&dev
->qf_cmd_lock
);
986 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
987 list_del(&cmd
->se_qf_node
);
988 atomic_dec(&dev
->dev_qf_count
);
989 smp_mb__after_atomic_dec();
991 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
992 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
993 (cmd
->t_state
== TRANSPORT_COMPLETE_OK
) ? "COMPLETE_OK" :
994 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
997 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
998 * has been added to head of queue
1000 transport_add_cmd_to_queue(cmd
, cmd
->t_state
);
1004 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
1006 switch (cmd
->data_direction
) {
1009 case DMA_FROM_DEVICE
:
1013 case DMA_BIDIRECTIONAL
:
1022 void transport_dump_dev_state(
1023 struct se_device
*dev
,
1027 *bl
+= sprintf(b
+ *bl
, "Status: ");
1028 switch (dev
->dev_status
) {
1029 case TRANSPORT_DEVICE_ACTIVATED
:
1030 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1032 case TRANSPORT_DEVICE_DEACTIVATED
:
1033 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1035 case TRANSPORT_DEVICE_SHUTDOWN
:
1036 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1038 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1039 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1040 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1043 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1047 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1048 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1050 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1051 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1052 *bl
+= sprintf(b
+ *bl
, " ");
1055 /* transport_release_all_cmds():
1059 static void transport_release_all_cmds(struct se_device
*dev
)
1061 struct se_cmd
*cmd
, *tcmd
;
1062 int bug_out
= 0, t_state
;
1063 unsigned long flags
;
1065 spin_lock_irqsave(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1066 list_for_each_entry_safe(cmd
, tcmd
, &dev
->dev_queue_obj
.qobj_list
,
1068 t_state
= cmd
->t_state
;
1069 list_del(&cmd
->se_queue_node
);
1070 spin_unlock_irqrestore(&dev
->dev_queue_obj
.cmd_queue_lock
,
1073 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
1074 " t_state: %u directly\n",
1075 cmd
->se_tfo
->get_task_tag(cmd
),
1076 cmd
->se_tfo
->get_cmd_state(cmd
), t_state
);
1078 transport_release_fe_cmd(cmd
);
1081 spin_lock_irqsave(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1083 spin_unlock_irqrestore(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1090 void transport_dump_vpd_proto_id(
1091 struct t10_vpd
*vpd
,
1092 unsigned char *p_buf
,
1095 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1098 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1099 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1101 switch (vpd
->protocol_identifier
) {
1103 sprintf(buf
+len
, "Fibre Channel\n");
1106 sprintf(buf
+len
, "Parallel SCSI\n");
1109 sprintf(buf
+len
, "SSA\n");
1112 sprintf(buf
+len
, "IEEE 1394\n");
1115 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1119 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1122 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1125 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1129 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1132 sprintf(buf
+len
, "Unknown 0x%02x\n",
1133 vpd
->protocol_identifier
);
1138 strncpy(p_buf
, buf
, p_buf_len
);
1140 pr_debug("%s", buf
);
1144 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1147 * Check if the Protocol Identifier Valid (PIV) bit is set..
1149 * from spc3r23.pdf section 7.5.1
1151 if (page_83
[1] & 0x80) {
1152 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1153 vpd
->protocol_identifier_set
= 1;
1154 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1157 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1159 int transport_dump_vpd_assoc(
1160 struct t10_vpd
*vpd
,
1161 unsigned char *p_buf
,
1164 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1168 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1169 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1171 switch (vpd
->association
) {
1173 sprintf(buf
+len
, "addressed logical unit\n");
1176 sprintf(buf
+len
, "target port\n");
1179 sprintf(buf
+len
, "SCSI target device\n");
1182 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1188 strncpy(p_buf
, buf
, p_buf_len
);
1190 pr_debug("%s", buf
);
1195 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1198 * The VPD identification association..
1200 * from spc3r23.pdf Section 7.6.3.1 Table 297
1202 vpd
->association
= (page_83
[1] & 0x30);
1203 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1205 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1207 int transport_dump_vpd_ident_type(
1208 struct t10_vpd
*vpd
,
1209 unsigned char *p_buf
,
1212 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1216 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1217 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1219 switch (vpd
->device_identifier_type
) {
1221 sprintf(buf
+len
, "Vendor specific\n");
1224 sprintf(buf
+len
, "T10 Vendor ID based\n");
1227 sprintf(buf
+len
, "EUI-64 based\n");
1230 sprintf(buf
+len
, "NAA\n");
1233 sprintf(buf
+len
, "Relative target port identifier\n");
1236 sprintf(buf
+len
, "SCSI name string\n");
1239 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1240 vpd
->device_identifier_type
);
1246 if (p_buf_len
< strlen(buf
)+1)
1248 strncpy(p_buf
, buf
, p_buf_len
);
1250 pr_debug("%s", buf
);
1256 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1259 * The VPD identifier type..
1261 * from spc3r23.pdf Section 7.6.3.1 Table 298
1263 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1264 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1266 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1268 int transport_dump_vpd_ident(
1269 struct t10_vpd
*vpd
,
1270 unsigned char *p_buf
,
1273 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1276 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1278 switch (vpd
->device_identifier_code_set
) {
1279 case 0x01: /* Binary */
1280 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1281 &vpd
->device_identifier
[0]);
1283 case 0x02: /* ASCII */
1284 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1285 &vpd
->device_identifier
[0]);
1287 case 0x03: /* UTF-8 */
1288 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1289 &vpd
->device_identifier
[0]);
1292 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1293 " 0x%02x", vpd
->device_identifier_code_set
);
1299 strncpy(p_buf
, buf
, p_buf_len
);
1301 pr_debug("%s", buf
);
1307 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1309 static const char hex_str
[] = "0123456789abcdef";
1310 int j
= 0, i
= 4; /* offset to start of the identifer */
1313 * The VPD Code Set (encoding)
1315 * from spc3r23.pdf Section 7.6.3.1 Table 296
1317 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1318 switch (vpd
->device_identifier_code_set
) {
1319 case 0x01: /* Binary */
1320 vpd
->device_identifier
[j
++] =
1321 hex_str
[vpd
->device_identifier_type
];
1322 while (i
< (4 + page_83
[3])) {
1323 vpd
->device_identifier
[j
++] =
1324 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1325 vpd
->device_identifier
[j
++] =
1326 hex_str
[page_83
[i
] & 0x0f];
1330 case 0x02: /* ASCII */
1331 case 0x03: /* UTF-8 */
1332 while (i
< (4 + page_83
[3]))
1333 vpd
->device_identifier
[j
++] = page_83
[i
++];
1339 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1341 EXPORT_SYMBOL(transport_set_vpd_ident
);
1343 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1346 * If this device is from Target_Core_Mod/pSCSI, disable the
1347 * SAM Task Attribute emulation.
1349 * This is currently not available in upsream Linux/SCSI Target
1350 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1352 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1353 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1357 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1358 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1359 " device\n", dev
->transport
->name
,
1360 dev
->transport
->get_device_rev(dev
));
1363 static void scsi_dump_inquiry(struct se_device
*dev
)
1365 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1368 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1370 pr_debug(" Vendor: ");
1371 for (i
= 0; i
< 8; i
++)
1372 if (wwn
->vendor
[i
] >= 0x20)
1373 pr_debug("%c", wwn
->vendor
[i
]);
1377 pr_debug(" Model: ");
1378 for (i
= 0; i
< 16; i
++)
1379 if (wwn
->model
[i
] >= 0x20)
1380 pr_debug("%c", wwn
->model
[i
]);
1384 pr_debug(" Revision: ");
1385 for (i
= 0; i
< 4; i
++)
1386 if (wwn
->revision
[i
] >= 0x20)
1387 pr_debug("%c", wwn
->revision
[i
]);
1393 device_type
= dev
->transport
->get_device_type(dev
);
1394 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1395 pr_debug(" ANSI SCSI revision: %02x\n",
1396 dev
->transport
->get_device_rev(dev
));
1399 struct se_device
*transport_add_device_to_core_hba(
1401 struct se_subsystem_api
*transport
,
1402 struct se_subsystem_dev
*se_dev
,
1404 void *transport_dev
,
1405 struct se_dev_limits
*dev_limits
,
1406 const char *inquiry_prod
,
1407 const char *inquiry_rev
)
1410 struct se_device
*dev
;
1412 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1414 pr_err("Unable to allocate memory for se_dev_t\n");
1418 transport_init_queue_obj(&dev
->dev_queue_obj
);
1419 dev
->dev_flags
= device_flags
;
1420 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1421 dev
->dev_ptr
= transport_dev
;
1423 dev
->se_sub_dev
= se_dev
;
1424 dev
->transport
= transport
;
1425 atomic_set(&dev
->active_cmds
, 0);
1426 INIT_LIST_HEAD(&dev
->dev_list
);
1427 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1428 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1429 INIT_LIST_HEAD(&dev
->execute_task_list
);
1430 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1431 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1432 INIT_LIST_HEAD(&dev
->state_task_list
);
1433 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1434 spin_lock_init(&dev
->execute_task_lock
);
1435 spin_lock_init(&dev
->delayed_cmd_lock
);
1436 spin_lock_init(&dev
->ordered_cmd_lock
);
1437 spin_lock_init(&dev
->state_task_lock
);
1438 spin_lock_init(&dev
->dev_alua_lock
);
1439 spin_lock_init(&dev
->dev_reservation_lock
);
1440 spin_lock_init(&dev
->dev_status_lock
);
1441 spin_lock_init(&dev
->dev_status_thr_lock
);
1442 spin_lock_init(&dev
->se_port_lock
);
1443 spin_lock_init(&dev
->se_tmr_lock
);
1444 spin_lock_init(&dev
->qf_cmd_lock
);
1446 dev
->queue_depth
= dev_limits
->queue_depth
;
1447 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1448 atomic_set(&dev
->dev_ordered_id
, 0);
1450 se_dev_set_default_attribs(dev
, dev_limits
);
1452 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1453 dev
->creation_time
= get_jiffies_64();
1454 spin_lock_init(&dev
->stats_lock
);
1456 spin_lock(&hba
->device_lock
);
1457 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1459 spin_unlock(&hba
->device_lock
);
1461 * Setup the SAM Task Attribute emulation for struct se_device
1463 core_setup_task_attr_emulation(dev
);
1465 * Force PR and ALUA passthrough emulation with internal object use.
1467 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1469 * Setup the Reservations infrastructure for struct se_device
1471 core_setup_reservations(dev
, force_pt
);
1473 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1475 if (core_setup_alua(dev
, force_pt
) < 0)
1479 * Startup the struct se_device processing thread
1481 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1482 "LIO_%s", dev
->transport
->name
);
1483 if (IS_ERR(dev
->process_thread
)) {
1484 pr_err("Unable to create kthread: LIO_%s\n",
1485 dev
->transport
->name
);
1489 * Setup work_queue for QUEUE_FULL
1491 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1493 * Preload the initial INQUIRY const values if we are doing
1494 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1495 * passthrough because this is being provided by the backend LLD.
1496 * This is required so that transport_get_inquiry() copies these
1497 * originals once back into DEV_T10_WWN(dev) for the virtual device
1500 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1501 if (!inquiry_prod
|| !inquiry_rev
) {
1502 pr_err("All non TCM/pSCSI plugins require"
1503 " INQUIRY consts\n");
1507 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1508 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1509 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1511 scsi_dump_inquiry(dev
);
1515 kthread_stop(dev
->process_thread
);
1517 spin_lock(&hba
->device_lock
);
1518 list_del(&dev
->dev_list
);
1520 spin_unlock(&hba
->device_lock
);
1522 se_release_vpd_for_dev(dev
);
1528 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1530 /* transport_generic_prepare_cdb():
1532 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1533 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1534 * The point of this is since we are mapping iSCSI LUNs to
1535 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1536 * devices and HBAs for a loop.
1538 static inline void transport_generic_prepare_cdb(
1542 case READ_10
: /* SBC - RDProtect */
1543 case READ_12
: /* SBC - RDProtect */
1544 case READ_16
: /* SBC - RDProtect */
1545 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1546 case VERIFY
: /* SBC - VRProtect */
1547 case VERIFY_16
: /* SBC - VRProtect */
1548 case WRITE_VERIFY
: /* SBC - VRProtect */
1549 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1552 cdb
[1] &= 0x1f; /* clear logical unit number */
1557 static struct se_task
*
1558 transport_generic_get_task(struct se_cmd
*cmd
,
1559 enum dma_data_direction data_direction
)
1561 struct se_task
*task
;
1562 struct se_device
*dev
= cmd
->se_dev
;
1564 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1566 pr_err("Unable to allocate struct se_task\n");
1570 INIT_LIST_HEAD(&task
->t_list
);
1571 INIT_LIST_HEAD(&task
->t_execute_list
);
1572 INIT_LIST_HEAD(&task
->t_state_list
);
1573 init_completion(&task
->task_stop_comp
);
1574 task
->task_se_cmd
= cmd
;
1576 task
->task_data_direction
= data_direction
;
1581 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1584 * Used by fabric modules containing a local struct se_cmd within their
1585 * fabric dependent per I/O descriptor.
1587 void transport_init_se_cmd(
1589 struct target_core_fabric_ops
*tfo
,
1590 struct se_session
*se_sess
,
1594 unsigned char *sense_buffer
)
1596 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1597 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1598 INIT_LIST_HEAD(&cmd
->se_ordered_node
);
1599 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1601 INIT_LIST_HEAD(&cmd
->t_task_list
);
1602 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1603 init_completion(&cmd
->transport_lun_stop_comp
);
1604 init_completion(&cmd
->t_transport_stop_comp
);
1605 spin_lock_init(&cmd
->t_state_lock
);
1606 atomic_set(&cmd
->transport_dev_active
, 1);
1609 cmd
->se_sess
= se_sess
;
1610 cmd
->data_length
= data_length
;
1611 cmd
->data_direction
= data_direction
;
1612 cmd
->sam_task_attr
= task_attr
;
1613 cmd
->sense_buffer
= sense_buffer
;
1615 EXPORT_SYMBOL(transport_init_se_cmd
);
1617 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1620 * Check if SAM Task Attribute emulation is enabled for this
1621 * struct se_device storage object
1623 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1626 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1627 pr_debug("SAM Task Attribute ACA"
1628 " emulation is not supported\n");
1632 * Used to determine when ORDERED commands should go from
1633 * Dormant to Active status.
1635 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1636 smp_mb__after_atomic_inc();
1637 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1638 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1639 cmd
->se_dev
->transport
->name
);
1643 void transport_free_se_cmd(
1644 struct se_cmd
*se_cmd
)
1646 if (se_cmd
->se_tmr_req
)
1647 core_tmr_release_req(se_cmd
->se_tmr_req
);
1649 * Check and free any extended CDB buffer that was allocated
1651 if (se_cmd
->t_task_cdb
!= se_cmd
->__t_task_cdb
)
1652 kfree(se_cmd
->t_task_cdb
);
1654 EXPORT_SYMBOL(transport_free_se_cmd
);
1656 static void transport_generic_wait_for_tasks(struct se_cmd
*, int, int);
1658 /* transport_generic_allocate_tasks():
1660 * Called from fabric RX Thread.
1662 int transport_generic_allocate_tasks(
1668 transport_generic_prepare_cdb(cdb
);
1671 * This is needed for early exceptions.
1673 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1676 * Ensure that the received CDB is less than the max (252 + 8) bytes
1677 * for VARIABLE_LENGTH_CMD
1679 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1680 pr_err("Received SCSI CDB with command_size: %d that"
1681 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1682 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1686 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1687 * allocate the additional extended CDB buffer now.. Otherwise
1688 * setup the pointer from __t_task_cdb to t_task_cdb.
1690 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1691 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1693 if (!cmd
->t_task_cdb
) {
1694 pr_err("Unable to allocate cmd->t_task_cdb"
1695 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1696 scsi_command_size(cdb
),
1697 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1701 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1703 * Copy the original CDB into cmd->
1705 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1707 * Setup the received CDB based on SCSI defined opcodes and
1708 * perform unit attention, persistent reservations and ALUA
1709 * checks for virtual device backends. The cmd->t_task_cdb
1710 * pointer is expected to be setup before we reach this point.
1712 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1716 * Check for SAM Task Attribute Emulation
1718 if (transport_check_alloc_task_attr(cmd
) < 0) {
1719 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1720 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1723 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1724 if (cmd
->se_lun
->lun_sep
)
1725 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1726 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1729 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1732 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1733 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1735 int transport_generic_handle_cdb(
1740 pr_err("cmd->se_lun is NULL\n");
1744 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD
);
1747 EXPORT_SYMBOL(transport_generic_handle_cdb
);
1749 static void transport_generic_request_failure(struct se_cmd
*,
1750 struct se_device
*, int, int);
1752 * Used by fabric module frontends to queue tasks directly.
1753 * Many only be used from process context only
1755 int transport_handle_cdb_direct(
1762 pr_err("cmd->se_lun is NULL\n");
1765 if (in_interrupt()) {
1767 pr_err("transport_generic_handle_cdb cannot be called"
1768 " from interrupt context\n");
1772 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1773 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1774 * in existing usage to ensure that outstanding descriptors are handled
1775 * correctly during shutdown via transport_generic_wait_for_tasks()
1777 * Also, we don't take cmd->t_state_lock here as we only expect
1778 * this to be called for initial descriptor submission.
1780 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1781 atomic_set(&cmd
->t_transport_active
, 1);
1783 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1784 * so follow TRANSPORT_NEW_CMD processing thread context usage
1785 * and call transport_generic_request_failure() if necessary..
1787 ret
= transport_generic_new_cmd(cmd
);
1791 cmd
->transport_error_status
= ret
;
1792 transport_generic_request_failure(cmd
, NULL
, 0,
1793 (cmd
->data_direction
!= DMA_TO_DEVICE
));
1797 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1800 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1801 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1802 * complete setup in TCM process context w/ TFO->new_cmd_map().
1804 int transport_generic_handle_cdb_map(
1809 pr_err("cmd->se_lun is NULL\n");
1813 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
);
1816 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1818 /* transport_generic_handle_data():
1822 int transport_generic_handle_data(
1826 * For the software fabric case, then we assume the nexus is being
1827 * failed/shutdown when signals are pending from the kthread context
1828 * caller, so we return a failure. For the HW target mode case running
1829 * in interrupt code, the signal_pending() check is skipped.
1831 if (!in_interrupt() && signal_pending(current
))
1834 * If the received CDB has aleady been ABORTED by the generic
1835 * target engine, we now call transport_check_aborted_status()
1836 * to queue any delated TASK_ABORTED status for the received CDB to the
1837 * fabric module as we are expecting no further incoming DATA OUT
1838 * sequences at this point.
1840 if (transport_check_aborted_status(cmd
, 1) != 0)
1843 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
);
1846 EXPORT_SYMBOL(transport_generic_handle_data
);
1848 /* transport_generic_handle_tmr():
1852 int transport_generic_handle_tmr(
1856 * This is needed for early exceptions.
1858 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1860 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
);
1863 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1865 void transport_generic_free_cmd_intr(
1868 transport_add_cmd_to_queue(cmd
, TRANSPORT_FREE_CMD_INTR
);
1870 EXPORT_SYMBOL(transport_generic_free_cmd_intr
);
1872 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1874 struct se_task
*task
, *task_tmp
;
1875 unsigned long flags
;
1878 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1879 cmd
->se_tfo
->get_task_tag(cmd
));
1882 * No tasks remain in the execution queue
1884 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1885 list_for_each_entry_safe(task
, task_tmp
,
1886 &cmd
->t_task_list
, t_list
) {
1887 pr_debug("task_no[%d] - Processing task %p\n",
1888 task
->task_no
, task
);
1890 * If the struct se_task has not been sent and is not active,
1891 * remove the struct se_task from the execution queue.
1893 if (!atomic_read(&task
->task_sent
) &&
1894 !atomic_read(&task
->task_active
)) {
1895 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1897 transport_remove_task_from_execute_queue(task
,
1900 pr_debug("task_no[%d] - Removed from execute queue\n",
1902 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1907 * If the struct se_task is active, sleep until it is returned
1910 if (atomic_read(&task
->task_active
)) {
1911 atomic_set(&task
->task_stop
, 1);
1912 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1915 pr_debug("task_no[%d] - Waiting to complete\n",
1917 wait_for_completion(&task
->task_stop_comp
);
1918 pr_debug("task_no[%d] - Stopped successfully\n",
1921 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1922 atomic_dec(&cmd
->t_task_cdbs_left
);
1924 atomic_set(&task
->task_active
, 0);
1925 atomic_set(&task
->task_stop
, 0);
1927 pr_debug("task_no[%d] - Did nothing\n", task
->task_no
);
1931 __transport_stop_task_timer(task
, &flags
);
1933 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1939 * Handle SAM-esque emulation for generic transport request failures.
1941 static void transport_generic_request_failure(
1943 struct se_device
*dev
,
1949 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1950 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1951 cmd
->t_task_cdb
[0]);
1952 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1953 " %d/%d transport_error_status: %d\n",
1954 cmd
->se_tfo
->get_cmd_state(cmd
),
1955 cmd
->t_state
, cmd
->deferred_t_state
,
1956 cmd
->transport_error_status
);
1957 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1958 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1959 " t_transport_active: %d t_transport_stop: %d"
1960 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1961 atomic_read(&cmd
->t_task_cdbs_left
),
1962 atomic_read(&cmd
->t_task_cdbs_sent
),
1963 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1964 atomic_read(&cmd
->t_transport_active
),
1965 atomic_read(&cmd
->t_transport_stop
),
1966 atomic_read(&cmd
->t_transport_sent
));
1968 transport_stop_all_task_timers(cmd
);
1971 atomic_inc(&dev
->depth_left
);
1973 * For SAM Task Attribute emulation for failed struct se_cmd
1975 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1976 transport_complete_task_attr(cmd
);
1979 transport_direct_request_timeout(cmd
);
1980 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1983 switch (cmd
->transport_error_status
) {
1984 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1985 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1987 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1988 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1990 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1991 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1993 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1994 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1996 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1998 transport_new_cmd_failure(cmd
);
2000 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2001 * we force this session to fall back to session
2004 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
2005 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
2008 case PYX_TRANSPORT_LU_COMM_FAILURE
:
2009 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
2010 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2012 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
2013 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
2015 case PYX_TRANSPORT_WRITE_PROTECTED
:
2016 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
2018 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
2020 * No SENSE Data payload for this case, set SCSI Status
2021 * and queue the response to $FABRIC_MOD.
2023 * Uses linux/include/scsi/scsi.h SAM status codes defs
2025 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2027 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2028 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2031 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2034 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2035 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2036 cmd
->orig_fe_lun
, 0x2C,
2037 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2039 ret
= cmd
->se_tfo
->queue_status(cmd
);
2043 case PYX_TRANSPORT_USE_SENSE_REASON
:
2045 * struct se_cmd->scsi_sense_reason already set
2049 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
2051 cmd
->transport_error_status
);
2052 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
2056 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2057 * make the call to transport_send_check_condition_and_sense()
2058 * directly. Otherwise expect the fabric to make the call to
2059 * transport_send_check_condition_and_sense() after handling
2060 * possible unsoliticied write data payloads.
2062 if (!sc
&& !cmd
->se_tfo
->new_cmd_map
)
2063 transport_new_cmd_failure(cmd
);
2065 ret
= transport_send_check_condition_and_sense(cmd
,
2066 cmd
->scsi_sense_reason
, 0);
2072 transport_lun_remove_cmd(cmd
);
2073 if (!transport_cmd_check_stop_to_fabric(cmd
))
2078 cmd
->t_state
= TRANSPORT_COMPLETE_OK
;
2079 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
2082 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
2084 unsigned long flags
;
2086 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2087 if (!atomic_read(&cmd
->t_transport_timeout
)) {
2088 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2091 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
2092 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2096 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
2098 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2101 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
2103 unsigned long flags
;
2106 * Reset cmd->t_se_count to allow transport_generic_remove()
2107 * to allow last call to free memory resources.
2109 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2110 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
2111 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
2113 atomic_sub(tmp
, &cmd
->t_se_count
);
2115 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2117 transport_generic_remove(cmd
, 0);
2120 static inline u32
transport_lba_21(unsigned char *cdb
)
2122 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2125 static inline u32
transport_lba_32(unsigned char *cdb
)
2127 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2130 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2132 unsigned int __v1
, __v2
;
2134 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2135 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2137 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2141 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2143 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2145 unsigned int __v1
, __v2
;
2147 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2148 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2150 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2153 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2155 unsigned long flags
;
2157 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2158 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2159 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2163 * Called from interrupt context.
2165 static void transport_task_timeout_handler(unsigned long data
)
2167 struct se_task
*task
= (struct se_task
*)data
;
2168 struct se_cmd
*cmd
= task
->task_se_cmd
;
2169 unsigned long flags
;
2171 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2173 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2174 if (task
->task_flags
& TF_STOP
) {
2175 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2178 task
->task_flags
&= ~TF_RUNNING
;
2181 * Determine if transport_complete_task() has already been called.
2183 if (!atomic_read(&task
->task_active
)) {
2184 pr_debug("transport task: %p cmd: %p timeout task_active"
2185 " == 0\n", task
, cmd
);
2186 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2190 atomic_inc(&cmd
->t_se_count
);
2191 atomic_inc(&cmd
->t_transport_timeout
);
2192 cmd
->t_tasks_failed
= 1;
2194 atomic_set(&task
->task_timeout
, 1);
2195 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2196 task
->task_scsi_status
= 1;
2198 if (atomic_read(&task
->task_stop
)) {
2199 pr_debug("transport task: %p cmd: %p timeout task_stop"
2200 " == 1\n", task
, cmd
);
2201 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2202 complete(&task
->task_stop_comp
);
2206 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2207 pr_debug("transport task: %p cmd: %p timeout non zero"
2208 " t_task_cdbs_left\n", task
, cmd
);
2209 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2212 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2215 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2216 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2218 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
);
2222 * Called with cmd->t_state_lock held.
2224 static void transport_start_task_timer(struct se_task
*task
)
2226 struct se_device
*dev
= task
->se_dev
;
2229 if (task
->task_flags
& TF_RUNNING
)
2232 * If the task_timeout is disabled, exit now.
2234 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2238 init_timer(&task
->task_timer
);
2239 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2240 task
->task_timer
.data
= (unsigned long) task
;
2241 task
->task_timer
.function
= transport_task_timeout_handler
;
2243 task
->task_flags
|= TF_RUNNING
;
2244 add_timer(&task
->task_timer
);
2246 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2247 " %d\n", task
->task_se_cmd
, task
, timeout
);
2252 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2254 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2256 struct se_cmd
*cmd
= task
->task_se_cmd
;
2258 if (!task
->task_flags
& TF_RUNNING
)
2261 task
->task_flags
|= TF_STOP
;
2262 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
2264 del_timer_sync(&task
->task_timer
);
2266 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
2267 task
->task_flags
&= ~TF_RUNNING
;
2268 task
->task_flags
&= ~TF_STOP
;
2271 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2273 struct se_task
*task
= NULL
, *task_tmp
;
2274 unsigned long flags
;
2276 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2277 list_for_each_entry_safe(task
, task_tmp
,
2278 &cmd
->t_task_list
, t_list
)
2279 __transport_stop_task_timer(task
, &flags
);
2280 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2283 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2285 if (dev
->dev_tcq_window_closed
++ <
2286 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2287 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2289 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2291 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2296 * Called from Fabric Module context from transport_execute_tasks()
2298 * The return of this function determins if the tasks from struct se_cmd
2299 * get added to the execution queue in transport_execute_tasks(),
2300 * or are added to the delayed or ordered lists here.
2302 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2304 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2307 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2308 * to allow the passed struct se_cmd list of tasks to the front of the list.
2310 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2311 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2312 smp_mb__after_atomic_inc();
2313 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2314 " 0x%02x, se_ordered_id: %u\n",
2316 cmd
->se_ordered_id
);
2318 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2319 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2320 list_add_tail(&cmd
->se_ordered_node
,
2321 &cmd
->se_dev
->ordered_cmd_list
);
2322 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2324 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2325 smp_mb__after_atomic_inc();
2327 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2328 " list, se_ordered_id: %u\n",
2330 cmd
->se_ordered_id
);
2332 * Add ORDERED command to tail of execution queue if
2333 * no other older commands exist that need to be
2336 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2340 * For SIMPLE and UNTAGGED Task Attribute commands
2342 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2343 smp_mb__after_atomic_inc();
2346 * Otherwise if one or more outstanding ORDERED task attribute exist,
2347 * add the dormant task(s) built for the passed struct se_cmd to the
2348 * execution queue and become in Active state for this struct se_device.
2350 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2352 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2353 * will be drained upon completion of HEAD_OF_QUEUE task.
2355 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2356 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2357 list_add_tail(&cmd
->se_delayed_node
,
2358 &cmd
->se_dev
->delayed_cmd_list
);
2359 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2361 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2362 " delayed CMD list, se_ordered_id: %u\n",
2363 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2364 cmd
->se_ordered_id
);
2366 * Return zero to let transport_execute_tasks() know
2367 * not to add the delayed tasks to the execution list.
2372 * Otherwise, no ORDERED task attributes exist..
2378 * Called from fabric module context in transport_generic_new_cmd() and
2379 * transport_generic_process_write()
2381 static int transport_execute_tasks(struct se_cmd
*cmd
)
2385 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2386 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2387 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2392 * Call transport_cmd_check_stop() to see if a fabric exception
2393 * has occurred that prevents execution.
2395 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2397 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2398 * attribute for the tasks of the received struct se_cmd CDB
2400 add_tasks
= transport_execute_task_attr(cmd
);
2404 * This calls transport_add_tasks_from_cmd() to handle
2405 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2406 * (if enabled) in __transport_add_task_to_execute_queue() and
2407 * transport_add_task_check_sam_attr().
2409 transport_add_tasks_from_cmd(cmd
);
2412 * Kick the execution queue for the cmd associated struct se_device
2416 __transport_execute_tasks(cmd
->se_dev
);
2421 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2422 * from struct se_device->execute_task_list and
2424 * Called from transport_processing_thread()
2426 static int __transport_execute_tasks(struct se_device
*dev
)
2429 struct se_cmd
*cmd
= NULL
;
2430 struct se_task
*task
= NULL
;
2431 unsigned long flags
;
2434 * Check if there is enough room in the device and HBA queue to send
2435 * struct se_tasks to the selected transport.
2438 if (!atomic_read(&dev
->depth_left
))
2439 return transport_tcq_window_closed(dev
);
2441 dev
->dev_tcq_window_closed
= 0;
2443 spin_lock_irq(&dev
->execute_task_lock
);
2444 if (list_empty(&dev
->execute_task_list
)) {
2445 spin_unlock_irq(&dev
->execute_task_lock
);
2448 task
= list_first_entry(&dev
->execute_task_list
,
2449 struct se_task
, t_execute_list
);
2450 list_del(&task
->t_execute_list
);
2451 atomic_set(&task
->task_execute_queue
, 0);
2452 atomic_dec(&dev
->execute_tasks
);
2453 spin_unlock_irq(&dev
->execute_task_lock
);
2455 atomic_dec(&dev
->depth_left
);
2457 cmd
= task
->task_se_cmd
;
2459 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2460 atomic_set(&task
->task_active
, 1);
2461 atomic_set(&task
->task_sent
, 1);
2462 atomic_inc(&cmd
->t_task_cdbs_sent
);
2464 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2465 cmd
->t_task_list_num
)
2466 atomic_set(&cmd
->transport_sent
, 1);
2468 transport_start_task_timer(task
);
2469 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2471 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2472 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2473 * struct se_subsystem_api->do_task() caller below.
2475 if (cmd
->transport_emulate_cdb
) {
2476 error
= cmd
->transport_emulate_cdb(cmd
);
2478 cmd
->transport_error_status
= error
;
2479 atomic_set(&task
->task_active
, 0);
2480 atomic_set(&cmd
->transport_sent
, 0);
2481 transport_stop_tasks_for_cmd(cmd
);
2482 transport_generic_request_failure(cmd
, dev
, 0, 1);
2486 * Handle the successful completion for transport_emulate_cdb()
2487 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2488 * Otherwise the caller is expected to complete the task with
2491 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2492 cmd
->scsi_status
= SAM_STAT_GOOD
;
2493 task
->task_scsi_status
= GOOD
;
2494 transport_complete_task(task
, 1);
2498 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2499 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2500 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2501 * LUN emulation code.
2503 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2504 * call ->do_task() directly and let the underlying TCM subsystem plugin
2505 * code handle the CDB emulation.
2507 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2508 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2509 error
= transport_emulate_control_cdb(task
);
2511 error
= dev
->transport
->do_task(task
);
2514 cmd
->transport_error_status
= error
;
2515 atomic_set(&task
->task_active
, 0);
2516 atomic_set(&cmd
->transport_sent
, 0);
2517 transport_stop_tasks_for_cmd(cmd
);
2518 transport_generic_request_failure(cmd
, dev
, 0, 1);
2527 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2529 unsigned long flags
;
2531 * Any unsolicited data will get dumped for failed command inside of
2534 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2535 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2536 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2537 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2540 static void transport_nop_wait_for_tasks(struct se_cmd
*, int, int);
2542 static inline u32
transport_get_sectors_6(
2547 struct se_device
*dev
= cmd
->se_dev
;
2550 * Assume TYPE_DISK for non struct se_device objects.
2551 * Use 8-bit sector value.
2557 * Use 24-bit allocation length for TYPE_TAPE.
2559 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2560 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2563 * Everything else assume TYPE_DISK Sector CDB location.
2564 * Use 8-bit sector value.
2570 static inline u32
transport_get_sectors_10(
2575 struct se_device
*dev
= cmd
->se_dev
;
2578 * Assume TYPE_DISK for non struct se_device objects.
2579 * Use 16-bit sector value.
2585 * XXX_10 is not defined in SSC, throw an exception
2587 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2593 * Everything else assume TYPE_DISK Sector CDB location.
2594 * Use 16-bit sector value.
2597 return (u32
)(cdb
[7] << 8) + cdb
[8];
2600 static inline u32
transport_get_sectors_12(
2605 struct se_device
*dev
= cmd
->se_dev
;
2608 * Assume TYPE_DISK for non struct se_device objects.
2609 * Use 32-bit sector value.
2615 * XXX_12 is not defined in SSC, throw an exception
2617 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2623 * Everything else assume TYPE_DISK Sector CDB location.
2624 * Use 32-bit sector value.
2627 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2630 static inline u32
transport_get_sectors_16(
2635 struct se_device
*dev
= cmd
->se_dev
;
2638 * Assume TYPE_DISK for non struct se_device objects.
2639 * Use 32-bit sector value.
2645 * Use 24-bit allocation length for TYPE_TAPE.
2647 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2648 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2651 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2652 (cdb
[12] << 8) + cdb
[13];
2656 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2658 static inline u32
transport_get_sectors_32(
2664 * Assume TYPE_DISK for non struct se_device objects.
2665 * Use 32-bit sector value.
2667 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2668 (cdb
[30] << 8) + cdb
[31];
2672 static inline u32
transport_get_size(
2677 struct se_device
*dev
= cmd
->se_dev
;
2679 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2680 if (cdb
[1] & 1) { /* sectors */
2681 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2686 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2687 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2688 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2689 dev
->transport
->name
);
2691 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2694 static void transport_xor_callback(struct se_cmd
*cmd
)
2696 unsigned char *buf
, *addr
;
2697 struct scatterlist
*sg
;
2698 unsigned int offset
;
2702 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2704 * 1) read the specified logical block(s);
2705 * 2) transfer logical blocks from the data-out buffer;
2706 * 3) XOR the logical blocks transferred from the data-out buffer with
2707 * the logical blocks read, storing the resulting XOR data in a buffer;
2708 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2709 * blocks transferred from the data-out buffer; and
2710 * 5) transfer the resulting XOR data to the data-in buffer.
2712 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2714 pr_err("Unable to allocate xor_callback buf\n");
2718 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2719 * into the locally allocated *buf
2721 sg_copy_to_buffer(cmd
->t_data_sg
,
2727 * Now perform the XOR against the BIDI read memory located at
2728 * cmd->t_mem_bidi_list
2732 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2733 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2737 for (i
= 0; i
< sg
->length
; i
++)
2738 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2740 offset
+= sg
->length
;
2741 kunmap_atomic(addr
, KM_USER0
);
2749 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2751 static int transport_get_sense_data(struct se_cmd
*cmd
)
2753 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2754 struct se_device
*dev
;
2755 struct se_task
*task
= NULL
, *task_tmp
;
2756 unsigned long flags
;
2759 WARN_ON(!cmd
->se_lun
);
2761 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2762 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2763 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2767 list_for_each_entry_safe(task
, task_tmp
,
2768 &cmd
->t_task_list
, t_list
) {
2770 if (!task
->task_sense
)
2777 if (!dev
->transport
->get_sense_buffer
) {
2778 pr_err("dev->transport->get_sense_buffer"
2783 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2784 if (!sense_buffer
) {
2785 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
2786 " sense buffer for task with sense\n",
2787 cmd
->se_tfo
->get_task_tag(cmd
), task
->task_no
);
2790 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2792 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2793 TRANSPORT_SENSE_BUFFER
);
2795 memcpy(&buffer
[offset
], sense_buffer
,
2796 TRANSPORT_SENSE_BUFFER
);
2797 cmd
->scsi_status
= task
->task_scsi_status
;
2798 /* Automatically padded */
2799 cmd
->scsi_sense_length
=
2800 (TRANSPORT_SENSE_BUFFER
+ offset
);
2802 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2804 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2808 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2814 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2816 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
2817 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2818 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2819 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2821 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2822 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2825 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2828 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2829 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2830 cmd
->orig_fe_lun
, 0x2C,
2831 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2835 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2837 return dev
->transport
->get_blocks(dev
) + 1;
2840 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2842 struct se_device
*dev
= cmd
->se_dev
;
2845 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2848 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2850 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2851 pr_err("LBA: %llu Sectors: %u exceeds"
2852 " transport_dev_end_lba(): %llu\n",
2853 cmd
->t_task_lba
, sectors
,
2854 transport_dev_end_lba(dev
));
2861 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2864 * Determine if the received WRITE_SAME is used to for direct
2865 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2866 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2867 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2869 int passthrough
= (dev
->transport
->transport_type
==
2870 TRANSPORT_PLUGIN_PHBA_PDEV
);
2873 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2874 pr_err("WRITE_SAME PBDATA and LBDATA"
2875 " bits not supported for Block Discard"
2880 * Currently for the emulated case we only accept
2881 * tpws with the UNMAP=1 bit set.
2883 if (!(flags
[0] & 0x08)) {
2884 pr_err("WRITE_SAME w/o UNMAP bit not"
2885 " supported for Block Discard Emulation\n");
2893 /* transport_generic_cmd_sequencer():
2895 * Generic Command Sequencer that should work for most DAS transport
2898 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2901 * FIXME: Need to support other SCSI OPCODES where as well.
2903 static int transport_generic_cmd_sequencer(
2907 struct se_device
*dev
= cmd
->se_dev
;
2908 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2909 int ret
= 0, sector_ret
= 0, passthrough
;
2910 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2914 * Check for an existing UNIT ATTENTION condition
2916 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2917 cmd
->transport_wait_for_tasks
=
2918 &transport_nop_wait_for_tasks
;
2919 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2920 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2924 * Check status of Asymmetric Logical Unit Assignment port
2926 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2928 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
2930 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2931 * The ALUA additional sense code qualifier (ASCQ) is determined
2932 * by the ALUA primary or secondary access state..
2936 pr_debug("[%s]: ALUA TG Port not available,"
2937 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2938 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2940 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2941 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2942 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2945 goto out_invalid_cdb_field
;
2948 * Check status for SPC-3 Persistent Reservations
2950 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2951 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2952 cmd
, cdb
, pr_reg_type
) != 0)
2953 return transport_handle_reservation_conflict(cmd
);
2955 * This means the CDB is allowed for the SCSI Initiator port
2956 * when said port is *NOT* holding the legacy SPC-2 or
2957 * SPC-3 Persistent Reservation.
2963 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2965 goto out_unsupported_cdb
;
2966 size
= transport_get_size(sectors
, cdb
, cmd
);
2967 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2968 cmd
->t_task_lba
= transport_lba_21(cdb
);
2969 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2972 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2974 goto out_unsupported_cdb
;
2975 size
= transport_get_size(sectors
, cdb
, cmd
);
2976 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2977 cmd
->t_task_lba
= transport_lba_32(cdb
);
2978 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2981 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2983 goto out_unsupported_cdb
;
2984 size
= transport_get_size(sectors
, cdb
, cmd
);
2985 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2986 cmd
->t_task_lba
= transport_lba_32(cdb
);
2987 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2990 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2992 goto out_unsupported_cdb
;
2993 size
= transport_get_size(sectors
, cdb
, cmd
);
2994 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
2995 cmd
->t_task_lba
= transport_lba_64(cdb
);
2996 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2999 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
3001 goto out_unsupported_cdb
;
3002 size
= transport_get_size(sectors
, cdb
, cmd
);
3003 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
3004 cmd
->t_task_lba
= transport_lba_21(cdb
);
3005 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3008 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3010 goto out_unsupported_cdb
;
3011 size
= transport_get_size(sectors
, cdb
, cmd
);
3012 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
3013 cmd
->t_task_lba
= transport_lba_32(cdb
);
3014 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
3015 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3018 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
3020 goto out_unsupported_cdb
;
3021 size
= transport_get_size(sectors
, cdb
, cmd
);
3022 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
3023 cmd
->t_task_lba
= transport_lba_32(cdb
);
3024 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
3025 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3028 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3030 goto out_unsupported_cdb
;
3031 size
= transport_get_size(sectors
, cdb
, cmd
);
3032 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
3033 cmd
->t_task_lba
= transport_lba_64(cdb
);
3034 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
3035 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3037 case XDWRITEREAD_10
:
3038 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
3039 !(cmd
->t_tasks_bidi
))
3040 goto out_invalid_cdb_field
;
3041 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3043 goto out_unsupported_cdb
;
3044 size
= transport_get_size(sectors
, cdb
, cmd
);
3045 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
3046 cmd
->t_task_lba
= transport_lba_32(cdb
);
3047 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3048 passthrough
= (dev
->transport
->transport_type
==
3049 TRANSPORT_PLUGIN_PHBA_PDEV
);
3051 * Skip the remaining assignments for TCM/PSCSI passthrough
3056 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3058 cmd
->transport_complete_callback
= &transport_xor_callback
;
3059 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
3061 case VARIABLE_LENGTH_CMD
:
3062 service_action
= get_unaligned_be16(&cdb
[8]);
3064 * Determine if this is TCM/PSCSI device and we should disable
3065 * internal emulation for this CDB.
3067 passthrough
= (dev
->transport
->transport_type
==
3068 TRANSPORT_PLUGIN_PHBA_PDEV
);
3070 switch (service_action
) {
3071 case XDWRITEREAD_32
:
3072 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3074 goto out_unsupported_cdb
;
3075 size
= transport_get_size(sectors
, cdb
, cmd
);
3077 * Use WRITE_32 and READ_32 opcodes for the emulated
3078 * XDWRITE_READ_32 logic.
3080 cmd
->transport_split_cdb
= &split_cdb_XX_32
;
3081 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
3082 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3085 * Skip the remaining assignments for TCM/PSCSI passthrough
3091 * Setup BIDI XOR callback to be run during
3092 * transport_generic_complete_ok()
3094 cmd
->transport_complete_callback
= &transport_xor_callback
;
3095 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
3098 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3100 goto out_unsupported_cdb
;
3103 size
= transport_get_size(1, cdb
, cmd
);
3105 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3107 goto out_invalid_cdb_field
;
3110 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
3111 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3113 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
3114 goto out_invalid_cdb_field
;
3118 pr_err("VARIABLE_LENGTH_CMD service action"
3119 " 0x%04x not supported\n", service_action
);
3120 goto out_unsupported_cdb
;
3123 case MAINTENANCE_IN
:
3124 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3125 /* MAINTENANCE_IN from SCC-2 */
3127 * Check for emulated MI_REPORT_TARGET_PGS.
3129 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
3130 cmd
->transport_emulate_cdb
=
3131 (su_dev
->t10_alua
.alua_type
==
3132 SPC3_ALUA_EMULATED
) ?
3133 core_emulate_report_target_port_groups
:
3136 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3137 (cdb
[8] << 8) | cdb
[9];
3139 /* GPCMD_SEND_KEY from multi media commands */
3140 size
= (cdb
[8] << 8) + cdb
[9];
3142 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3146 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3148 case MODE_SELECT_10
:
3149 size
= (cdb
[7] << 8) + cdb
[8];
3150 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3154 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3157 case GPCMD_READ_BUFFER_CAPACITY
:
3158 case GPCMD_SEND_OPC
:
3161 size
= (cdb
[7] << 8) + cdb
[8];
3162 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3164 case READ_BLOCK_LIMITS
:
3165 size
= READ_BLOCK_LEN
;
3166 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3168 case GPCMD_GET_CONFIGURATION
:
3169 case GPCMD_READ_FORMAT_CAPACITIES
:
3170 case GPCMD_READ_DISC_INFO
:
3171 case GPCMD_READ_TRACK_RZONE_INFO
:
3172 size
= (cdb
[7] << 8) + cdb
[8];
3173 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3175 case PERSISTENT_RESERVE_IN
:
3176 case PERSISTENT_RESERVE_OUT
:
3177 cmd
->transport_emulate_cdb
=
3178 (su_dev
->t10_pr
.res_type
==
3179 SPC3_PERSISTENT_RESERVATIONS
) ?
3180 core_scsi3_emulate_pr
: NULL
;
3181 size
= (cdb
[7] << 8) + cdb
[8];
3182 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3184 case GPCMD_MECHANISM_STATUS
:
3185 case GPCMD_READ_DVD_STRUCTURE
:
3186 size
= (cdb
[8] << 8) + cdb
[9];
3187 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3190 size
= READ_POSITION_LEN
;
3191 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3193 case MAINTENANCE_OUT
:
3194 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3195 /* MAINTENANCE_OUT from SCC-2
3197 * Check for emulated MO_SET_TARGET_PGS.
3199 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3200 cmd
->transport_emulate_cdb
=
3201 (su_dev
->t10_alua
.alua_type
==
3202 SPC3_ALUA_EMULATED
) ?
3203 core_emulate_set_target_port_groups
:
3207 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3208 (cdb
[8] << 8) | cdb
[9];
3210 /* GPCMD_REPORT_KEY from multi media commands */
3211 size
= (cdb
[8] << 8) + cdb
[9];
3213 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3216 size
= (cdb
[3] << 8) + cdb
[4];
3218 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3219 * See spc4r17 section 5.3
3221 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3222 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3223 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3226 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3227 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3230 size
= READ_CAP_LEN
;
3231 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3233 case READ_MEDIA_SERIAL_NUMBER
:
3234 case SECURITY_PROTOCOL_IN
:
3235 case SECURITY_PROTOCOL_OUT
:
3236 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3237 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3239 case SERVICE_ACTION_IN
:
3240 case ACCESS_CONTROL_IN
:
3241 case ACCESS_CONTROL_OUT
:
3243 case READ_ATTRIBUTE
:
3244 case RECEIVE_COPY_RESULTS
:
3245 case WRITE_ATTRIBUTE
:
3246 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3247 (cdb
[12] << 8) | cdb
[13];
3248 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3250 case RECEIVE_DIAGNOSTIC
:
3251 case SEND_DIAGNOSTIC
:
3252 size
= (cdb
[3] << 8) | cdb
[4];
3253 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3255 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3258 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3259 size
= (2336 * sectors
);
3260 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3265 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3269 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3271 case READ_ELEMENT_STATUS
:
3272 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3273 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3276 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3277 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3282 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3283 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3285 if (cdb
[0] == RESERVE_10
)
3286 size
= (cdb
[7] << 8) | cdb
[8];
3288 size
= cmd
->data_length
;
3291 * Setup the legacy emulated handler for SPC-2 and
3292 * >= SPC-3 compatible reservation handling (CRH=1)
3293 * Otherwise, we assume the underlying SCSI logic is
3294 * is running in SPC_PASSTHROUGH, and wants reservations
3295 * emulation disabled.
3297 cmd
->transport_emulate_cdb
=
3298 (su_dev
->t10_pr
.res_type
!=
3300 core_scsi2_emulate_crh
: NULL
;
3301 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3306 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3307 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3309 if (cdb
[0] == RELEASE_10
)
3310 size
= (cdb
[7] << 8) | cdb
[8];
3312 size
= cmd
->data_length
;
3314 cmd
->transport_emulate_cdb
=
3315 (su_dev
->t10_pr
.res_type
!=
3317 core_scsi2_emulate_crh
: NULL
;
3318 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3320 case SYNCHRONIZE_CACHE
:
3321 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3323 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3325 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3326 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3327 cmd
->t_task_lba
= transport_lba_32(cdb
);
3329 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3330 cmd
->t_task_lba
= transport_lba_64(cdb
);
3333 goto out_unsupported_cdb
;
3335 size
= transport_get_size(sectors
, cdb
, cmd
);
3336 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3339 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3341 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3344 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3345 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3347 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3349 * Check to ensure that LBA + Range does not exceed past end of
3350 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3352 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3353 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3354 goto out_invalid_cdb_field
;
3358 size
= get_unaligned_be16(&cdb
[7]);
3359 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3362 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3364 goto out_unsupported_cdb
;
3367 size
= transport_get_size(1, cdb
, cmd
);
3369 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3370 goto out_invalid_cdb_field
;
3373 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3374 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3376 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3377 goto out_invalid_cdb_field
;
3380 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3382 goto out_unsupported_cdb
;
3385 size
= transport_get_size(1, cdb
, cmd
);
3387 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3388 goto out_invalid_cdb_field
;
3391 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3392 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3394 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3395 * of byte 1 bit 3 UNMAP instead of original reserved field
3397 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3398 goto out_invalid_cdb_field
;
3400 case ALLOW_MEDIUM_REMOVAL
:
3401 case GPCMD_CLOSE_TRACK
:
3403 case INITIALIZE_ELEMENT_STATUS
:
3404 case GPCMD_LOAD_UNLOAD
:
3407 case GPCMD_SET_SPEED
:
3410 case TEST_UNIT_READY
:
3412 case WRITE_FILEMARKS
:
3414 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3417 cmd
->transport_emulate_cdb
=
3418 transport_core_report_lun_response
;
3419 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3421 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3422 * See spc4r17 section 5.3
3424 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3425 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3426 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3429 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3430 " 0x%02x, sending CHECK_CONDITION.\n",
3431 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3432 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3433 goto out_unsupported_cdb
;
3436 if (size
!= cmd
->data_length
) {
3437 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3438 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3439 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3440 cmd
->data_length
, size
, cdb
[0]);
3442 cmd
->cmd_spdtl
= size
;
3444 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3445 pr_err("Rejecting underflow/overflow"
3447 goto out_invalid_cdb_field
;
3450 * Reject READ_* or WRITE_* with overflow/underflow for
3451 * type SCF_SCSI_DATA_SG_IO_CDB.
3453 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3454 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3455 " CDB on non 512-byte sector setup subsystem"
3456 " plugin: %s\n", dev
->transport
->name
);
3457 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3458 goto out_invalid_cdb_field
;
3461 if (size
> cmd
->data_length
) {
3462 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3463 cmd
->residual_count
= (size
- cmd
->data_length
);
3465 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3466 cmd
->residual_count
= (cmd
->data_length
- size
);
3468 cmd
->data_length
= size
;
3471 /* Let's limit control cdbs to a page, for simplicity's sake. */
3472 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3474 goto out_invalid_cdb_field
;
3476 transport_set_supported_SAM_opcode(cmd
);
3479 out_unsupported_cdb
:
3480 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3481 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3483 out_invalid_cdb_field
:
3484 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3485 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3490 * Called from transport_generic_complete_ok() and
3491 * transport_generic_request_failure() to determine which dormant/delayed
3492 * and ordered cmds need to have their tasks added to the execution queue.
3494 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3496 struct se_device
*dev
= cmd
->se_dev
;
3497 struct se_cmd
*cmd_p
, *cmd_tmp
;
3498 int new_active_tasks
= 0;
3500 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3501 atomic_dec(&dev
->simple_cmds
);
3502 smp_mb__after_atomic_dec();
3503 dev
->dev_cur_ordered_id
++;
3504 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3505 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3506 cmd
->se_ordered_id
);
3507 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3508 atomic_dec(&dev
->dev_hoq_count
);
3509 smp_mb__after_atomic_dec();
3510 dev
->dev_cur_ordered_id
++;
3511 pr_debug("Incremented dev_cur_ordered_id: %u for"
3512 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3513 cmd
->se_ordered_id
);
3514 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3515 spin_lock(&dev
->ordered_cmd_lock
);
3516 list_del(&cmd
->se_ordered_node
);
3517 atomic_dec(&dev
->dev_ordered_sync
);
3518 smp_mb__after_atomic_dec();
3519 spin_unlock(&dev
->ordered_cmd_lock
);
3521 dev
->dev_cur_ordered_id
++;
3522 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3523 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3526 * Process all commands up to the last received
3527 * ORDERED task attribute which requires another blocking
3530 spin_lock(&dev
->delayed_cmd_lock
);
3531 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3532 &dev
->delayed_cmd_list
, se_delayed_node
) {
3534 list_del(&cmd_p
->se_delayed_node
);
3535 spin_unlock(&dev
->delayed_cmd_lock
);
3537 pr_debug("Calling add_tasks() for"
3538 " cmd_p: 0x%02x Task Attr: 0x%02x"
3539 " Dormant -> Active, se_ordered_id: %u\n",
3540 cmd_p
->t_task_cdb
[0],
3541 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3543 transport_add_tasks_from_cmd(cmd_p
);
3546 spin_lock(&dev
->delayed_cmd_lock
);
3547 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3550 spin_unlock(&dev
->delayed_cmd_lock
);
3552 * If new tasks have become active, wake up the transport thread
3553 * to do the processing of the Active tasks.
3555 if (new_active_tasks
!= 0)
3556 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3559 static int transport_complete_qf(struct se_cmd
*cmd
)
3563 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
3564 return cmd
->se_tfo
->queue_status(cmd
);
3566 switch (cmd
->data_direction
) {
3567 case DMA_FROM_DEVICE
:
3568 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3571 if (cmd
->t_bidi_data_sg
) {
3572 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3576 /* Fall through for DMA_TO_DEVICE */
3578 ret
= cmd
->se_tfo
->queue_status(cmd
);
3587 static void transport_handle_queue_full(
3589 struct se_device
*dev
,
3590 int (*qf_callback
)(struct se_cmd
*))
3592 spin_lock_irq(&dev
->qf_cmd_lock
);
3593 cmd
->se_cmd_flags
|= SCF_EMULATE_QUEUE_FULL
;
3594 cmd
->transport_qf_callback
= qf_callback
;
3595 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3596 atomic_inc(&dev
->dev_qf_count
);
3597 smp_mb__after_atomic_inc();
3598 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3600 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3603 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3605 int reason
= 0, ret
;
3607 * Check if we need to move delayed/dormant tasks from cmds on the
3608 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3611 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3612 transport_complete_task_attr(cmd
);
3614 * Check to schedule QUEUE_FULL work, or execute an existing
3615 * cmd->transport_qf_callback()
3617 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3618 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3620 if (cmd
->transport_qf_callback
) {
3621 ret
= cmd
->transport_qf_callback(cmd
);
3625 cmd
->transport_qf_callback
= NULL
;
3629 * Check if we need to retrieve a sense buffer from
3630 * the struct se_cmd in question.
3632 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3633 if (transport_get_sense_data(cmd
) < 0)
3634 reason
= TCM_NON_EXISTENT_LUN
;
3637 * Only set when an struct se_task->task_scsi_status returned
3638 * a non GOOD status.
3640 if (cmd
->scsi_status
) {
3641 ret
= transport_send_check_condition_and_sense(
3646 transport_lun_remove_cmd(cmd
);
3647 transport_cmd_check_stop_to_fabric(cmd
);
3652 * Check for a callback, used by amongst other things
3653 * XDWRITE_READ_10 emulation.
3655 if (cmd
->transport_complete_callback
)
3656 cmd
->transport_complete_callback(cmd
);
3658 switch (cmd
->data_direction
) {
3659 case DMA_FROM_DEVICE
:
3660 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3661 if (cmd
->se_lun
->lun_sep
) {
3662 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3665 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3667 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3672 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3673 if (cmd
->se_lun
->lun_sep
) {
3674 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3677 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3679 * Check if we need to send READ payload for BIDI-COMMAND
3681 if (cmd
->t_bidi_data_sg
) {
3682 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3683 if (cmd
->se_lun
->lun_sep
) {
3684 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3687 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3688 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3693 /* Fall through for DMA_TO_DEVICE */
3695 ret
= cmd
->se_tfo
->queue_status(cmd
);
3704 transport_lun_remove_cmd(cmd
);
3705 transport_cmd_check_stop_to_fabric(cmd
);
3709 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3710 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3711 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
3714 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3716 struct se_task
*task
, *task_tmp
;
3717 unsigned long flags
;
3719 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3720 list_for_each_entry_safe(task
, task_tmp
,
3721 &cmd
->t_task_list
, t_list
) {
3722 if (atomic_read(&task
->task_active
))
3725 kfree(task
->task_sg_bidi
);
3726 kfree(task
->task_sg
);
3728 list_del(&task
->t_list
);
3730 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3732 task
->se_dev
->transport
->free_task(task
);
3734 pr_err("task[%u] - task->se_dev is NULL\n",
3736 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3738 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3741 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3743 struct scatterlist
*sg
;
3746 for_each_sg(sgl
, sg
, nents
, count
)
3747 __free_page(sg_page(sg
));
3752 static inline void transport_free_pages(struct se_cmd
*cmd
)
3754 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3757 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3758 cmd
->t_data_sg
= NULL
;
3759 cmd
->t_data_nents
= 0;
3761 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3762 cmd
->t_bidi_data_sg
= NULL
;
3763 cmd
->t_bidi_data_nents
= 0;
3766 static inline void transport_release_tasks(struct se_cmd
*cmd
)
3768 transport_free_dev_tasks(cmd
);
3771 static inline int transport_dec_and_check(struct se_cmd
*cmd
)
3773 unsigned long flags
;
3775 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3776 if (atomic_read(&cmd
->t_fe_count
)) {
3777 if (!atomic_dec_and_test(&cmd
->t_fe_count
)) {
3778 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3784 if (atomic_read(&cmd
->t_se_count
)) {
3785 if (!atomic_dec_and_test(&cmd
->t_se_count
)) {
3786 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3791 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3796 static void transport_release_fe_cmd(struct se_cmd
*cmd
)
3798 unsigned long flags
;
3800 if (transport_dec_and_check(cmd
))
3803 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3804 if (!atomic_read(&cmd
->transport_dev_active
)) {
3805 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3808 atomic_set(&cmd
->transport_dev_active
, 0);
3809 transport_all_task_dev_remove_state(cmd
);
3810 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3812 transport_release_tasks(cmd
);
3814 transport_free_pages(cmd
);
3815 transport_free_se_cmd(cmd
);
3816 cmd
->se_tfo
->release_cmd(cmd
);
3820 transport_generic_remove(struct se_cmd
*cmd
, int session_reinstatement
)
3822 unsigned long flags
;
3824 if (transport_dec_and_check(cmd
)) {
3825 if (session_reinstatement
) {
3826 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3827 transport_all_task_dev_remove_state(cmd
);
3828 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3834 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3835 if (!atomic_read(&cmd
->transport_dev_active
)) {
3836 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3839 atomic_set(&cmd
->transport_dev_active
, 0);
3840 transport_all_task_dev_remove_state(cmd
);
3841 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3843 transport_release_tasks(cmd
);
3846 transport_free_pages(cmd
);
3847 transport_release_cmd(cmd
);
3852 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3853 * allocating in the core.
3854 * @cmd: Associated se_cmd descriptor
3855 * @mem: SGL style memory for TCM WRITE / READ
3856 * @sg_mem_num: Number of SGL elements
3857 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3858 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3860 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3863 int transport_generic_map_mem_to_cmd(
3865 struct scatterlist
*sgl
,
3867 struct scatterlist
*sgl_bidi
,
3870 if (!sgl
|| !sgl_count
)
3873 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3874 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3876 cmd
->t_data_sg
= sgl
;
3877 cmd
->t_data_nents
= sgl_count
;
3879 if (sgl_bidi
&& sgl_bidi_count
) {
3880 cmd
->t_bidi_data_sg
= sgl_bidi
;
3881 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3883 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3888 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3890 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
3892 struct se_device
*dev
= cmd
->se_dev
;
3893 int set_counts
= 1, rc
, task_cdbs
;
3896 * Setup any BIDI READ tasks and memory from
3897 * cmd->t_mem_bidi_list so the READ struct se_tasks
3898 * are queued first for the non pSCSI passthrough case.
3900 if (cmd
->t_bidi_data_sg
&&
3901 (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
3902 rc
= transport_allocate_tasks(cmd
,
3905 cmd
->t_bidi_data_sg
,
3906 cmd
->t_bidi_data_nents
);
3908 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3909 cmd
->scsi_sense_reason
=
3910 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3913 atomic_inc(&cmd
->t_fe_count
);
3914 atomic_inc(&cmd
->t_se_count
);
3918 * Setup the tasks and memory from cmd->t_mem_list
3919 * Note for BIDI transfers this will contain the WRITE payload
3921 task_cdbs
= transport_allocate_tasks(cmd
,
3923 cmd
->data_direction
,
3926 if (task_cdbs
<= 0) {
3927 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3928 cmd
->scsi_sense_reason
=
3929 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3934 atomic_inc(&cmd
->t_fe_count
);
3935 atomic_inc(&cmd
->t_se_count
);
3938 cmd
->t_task_list_num
= task_cdbs
;
3940 atomic_set(&cmd
->t_task_cdbs_left
, task_cdbs
);
3941 atomic_set(&cmd
->t_task_cdbs_ex_left
, task_cdbs
);
3942 atomic_set(&cmd
->t_task_cdbs_timeout_left
, task_cdbs
);
3946 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3948 struct scatterlist
*sg
= cmd
->t_data_sg
;
3952 * We need to take into account a possible offset here for fabrics like
3953 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3954 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3956 return kmap(sg_page(sg
)) + sg
->offset
;
3958 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3960 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3962 kunmap(sg_page(cmd
->t_data_sg
));
3964 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3967 transport_generic_get_mem(struct se_cmd
*cmd
)
3969 u32 length
= cmd
->data_length
;
3974 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3975 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3976 if (!cmd
->t_data_sg
)
3979 cmd
->t_data_nents
= nents
;
3980 sg_init_table(cmd
->t_data_sg
, nents
);
3983 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3984 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3988 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3996 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3999 kfree(cmd
->t_data_sg
);
4000 cmd
->t_data_sg
= NULL
;
4004 /* Reduce sectors if they are too long for the device */
4005 static inline sector_t
transport_limit_task_sectors(
4006 struct se_device
*dev
,
4007 unsigned long long lba
,
4010 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
4012 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
4013 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
4014 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
4021 * This function can be used by HW target mode drivers to create a linked
4022 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4023 * This is intended to be called during the completion path by TCM Core
4024 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4026 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
4028 struct scatterlist
*sg_first
= NULL
;
4029 struct scatterlist
*sg_prev
= NULL
;
4030 int sg_prev_nents
= 0;
4031 struct scatterlist
*sg
;
4032 struct se_task
*task
;
4033 u32 chained_nents
= 0;
4036 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
4039 * Walk the struct se_task list and setup scatterlist chains
4040 * for each contiguously allocated struct se_task->task_sg[].
4042 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
4047 sg_first
= task
->task_sg
;
4048 chained_nents
= task
->task_sg_nents
;
4050 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
4051 chained_nents
+= task
->task_sg_nents
;
4054 * For the padded tasks, use the extra SGL vector allocated
4055 * in transport_allocate_data_tasks() for the sg_prev_nents
4056 * offset into sg_chain() above.. The last task of a
4057 * multi-task list, or a single task will not have
4058 * task->task_sg_padded set..
4060 if (task
->task_padded_sg
)
4061 sg_prev_nents
= (task
->task_sg_nents
+ 1);
4063 sg_prev_nents
= task
->task_sg_nents
;
4065 sg_prev
= task
->task_sg
;
4068 * Setup the starting pointer and total t_tasks_sg_linked_no including
4069 * padding SGs for linking and to mark the end.
4071 cmd
->t_tasks_sg_chained
= sg_first
;
4072 cmd
->t_tasks_sg_chained_no
= chained_nents
;
4074 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
4075 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
4076 cmd
->t_tasks_sg_chained_no
);
4078 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
4079 cmd
->t_tasks_sg_chained_no
, i
) {
4081 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
4082 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
4083 if (sg_is_chain(sg
))
4084 pr_debug("SG: %p sg_is_chain=1\n", sg
);
4086 pr_debug("SG: %p sg_is_last=1\n", sg
);
4089 EXPORT_SYMBOL(transport_do_task_sg_chain
);
4092 * Break up cmd into chunks transport can handle
4094 static int transport_allocate_data_tasks(
4096 unsigned long long lba
,
4097 enum dma_data_direction data_direction
,
4098 struct scatterlist
*sgl
,
4099 unsigned int sgl_nents
)
4101 unsigned char *cdb
= NULL
;
4102 struct se_task
*task
;
4103 struct se_device
*dev
= cmd
->se_dev
;
4104 unsigned long flags
;
4105 int task_count
, i
, ret
;
4106 sector_t sectors
, dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
4107 u32 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
4108 struct scatterlist
*sg
;
4109 struct scatterlist
*cmd_sg
;
4111 WARN_ON(cmd
->data_length
% sector_size
);
4112 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
4113 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
4116 for (i
= 0; i
< task_count
; i
++) {
4117 unsigned int task_size
, task_sg_nents_padded
;
4120 task
= transport_generic_get_task(cmd
, data_direction
);
4124 task
->task_lba
= lba
;
4125 task
->task_sectors
= min(sectors
, dev_max_sectors
);
4126 task
->task_size
= task
->task_sectors
* sector_size
;
4128 cdb
= dev
->transport
->get_cdb(task
);
4131 memcpy(cdb
, cmd
->t_task_cdb
,
4132 scsi_command_size(cmd
->t_task_cdb
));
4134 /* Update new cdb with updated lba/sectors */
4135 cmd
->transport_split_cdb(task
->task_lba
, task
->task_sectors
, cdb
);
4137 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
4138 * in order to calculate the number per task SGL entries
4140 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
4142 * Check if the fabric module driver is requesting that all
4143 * struct se_task->task_sg[] be chained together.. If so,
4144 * then allocate an extra padding SG entry for linking and
4145 * marking the end of the chained SGL for every task except
4146 * the last one for (task_count > 1) operation, or skipping
4147 * the extra padding for the (task_count == 1) case.
4149 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
4150 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
4151 task
->task_padded_sg
= 1;
4153 task_sg_nents_padded
= task
->task_sg_nents
;
4155 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
4156 task_sg_nents_padded
, GFP_KERNEL
);
4157 if (!task
->task_sg
) {
4158 cmd
->se_dev
->transport
->free_task(task
);
4162 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
4164 task_size
= task
->task_size
;
4166 /* Build new sgl, only up to task_size */
4167 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
4168 if (cmd_sg
->length
> task_size
)
4172 task_size
-= cmd_sg
->length
;
4173 cmd_sg
= sg_next(cmd_sg
);
4176 lba
+= task
->task_sectors
;
4177 sectors
-= task
->task_sectors
;
4179 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4180 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4181 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4184 * Now perform the memory map of task->task_sg[] into backend
4185 * subsystem memory..
4187 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
4188 if (atomic_read(&task
->task_sent
))
4190 if (!dev
->transport
->map_data_SG
)
4193 ret
= dev
->transport
->map_data_SG(task
);
4202 transport_allocate_control_task(struct se_cmd
*cmd
)
4204 struct se_device
*dev
= cmd
->se_dev
;
4206 struct se_task
*task
;
4207 unsigned long flags
;
4210 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
4214 cdb
= dev
->transport
->get_cdb(task
);
4216 memcpy(cdb
, cmd
->t_task_cdb
,
4217 scsi_command_size(cmd
->t_task_cdb
));
4219 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
4221 if (!task
->task_sg
) {
4222 cmd
->se_dev
->transport
->free_task(task
);
4226 memcpy(task
->task_sg
, cmd
->t_data_sg
,
4227 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
4228 task
->task_size
= cmd
->data_length
;
4229 task
->task_sg_nents
= cmd
->t_data_nents
;
4231 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4232 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4233 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4235 if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) {
4236 if (dev
->transport
->map_control_SG
)
4237 ret
= dev
->transport
->map_control_SG(task
);
4238 } else if (cmd
->se_cmd_flags
& SCF_SCSI_NON_DATA_CDB
) {
4239 if (dev
->transport
->cdb_none
)
4240 ret
= dev
->transport
->cdb_none(task
);
4242 pr_err("target: Unknown control cmd type!\n");
4246 /* Success! Return number of tasks allocated */
4252 static u32
transport_allocate_tasks(
4254 unsigned long long lba
,
4255 enum dma_data_direction data_direction
,
4256 struct scatterlist
*sgl
,
4257 unsigned int sgl_nents
)
4259 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
4260 if (transport_cmd_get_valid_sectors(cmd
) < 0)
4263 return transport_allocate_data_tasks(cmd
, lba
, data_direction
,
4266 return transport_allocate_control_task(cmd
);
4271 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4273 * Allocate storage transport resources from a set of values predefined
4274 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4275 * Any non zero return here is treated as an "out of resource' op here.
4278 * Generate struct se_task(s) and/or their payloads for this CDB.
4280 int transport_generic_new_cmd(struct se_cmd
*cmd
)
4285 * Determine is the TCM fabric module has already allocated physical
4286 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4289 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
4291 ret
= transport_generic_get_mem(cmd
);
4296 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4297 * control or data CDB types, and perform the map to backend subsystem
4298 * code from SGL memory allocated here by transport_generic_get_mem(), or
4299 * via pre-existing SGL memory setup explictly by fabric module code with
4300 * transport_generic_map_mem_to_cmd().
4302 ret
= transport_new_cmd_obj(cmd
);
4306 * For WRITEs, let the fabric know its buffer is ready..
4307 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4308 * will be added to the struct se_device execution queue after its WRITE
4309 * data has arrived. (ie: It gets handled by the transport processing
4310 * thread a second time)
4312 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4313 transport_add_tasks_to_state_queue(cmd
);
4314 return transport_generic_write_pending(cmd
);
4317 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4318 * to the execution queue.
4320 transport_execute_tasks(cmd
);
4323 EXPORT_SYMBOL(transport_generic_new_cmd
);
4325 /* transport_generic_process_write():
4329 void transport_generic_process_write(struct se_cmd
*cmd
)
4331 transport_execute_tasks(cmd
);
4333 EXPORT_SYMBOL(transport_generic_process_write
);
4335 static int transport_write_pending_qf(struct se_cmd
*cmd
)
4337 return cmd
->se_tfo
->write_pending(cmd
);
4340 /* transport_generic_write_pending():
4344 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4346 unsigned long flags
;
4349 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4350 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4351 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4353 if (cmd
->transport_qf_callback
) {
4354 ret
= cmd
->transport_qf_callback(cmd
);
4360 cmd
->transport_qf_callback
= NULL
;
4365 * Clear the se_cmd for WRITE_PENDING status in order to set
4366 * cmd->t_transport_active=0 so that transport_generic_handle_data
4367 * can be called from HW target mode interrupt code. This is safe
4368 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4369 * because the se_cmd->se_lun pointer is not being cleared.
4371 transport_cmd_check_stop(cmd
, 1, 0);
4374 * Call the fabric write_pending function here to let the
4375 * frontend know that WRITE buffers are ready.
4377 ret
= cmd
->se_tfo
->write_pending(cmd
);
4383 return PYX_TRANSPORT_WRITE_PENDING
;
4386 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4387 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4388 transport_handle_queue_full(cmd
, cmd
->se_dev
,
4389 transport_write_pending_qf
);
4393 void transport_release_cmd(struct se_cmd
*cmd
)
4395 BUG_ON(!cmd
->se_tfo
);
4397 transport_free_se_cmd(cmd
);
4398 cmd
->se_tfo
->release_cmd(cmd
);
4400 EXPORT_SYMBOL(transport_release_cmd
);
4402 /* transport_generic_free_cmd():
4404 * Called from processing frontend to release storage engine resources
4406 void transport_generic_free_cmd(
4409 int session_reinstatement
)
4411 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
))
4412 transport_release_cmd(cmd
);
4414 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4418 pr_debug("cmd: %p ITT: 0x%08x contains"
4419 " cmd->se_lun\n", cmd
,
4420 cmd
->se_tfo
->get_task_tag(cmd
));
4422 transport_lun_remove_cmd(cmd
);
4425 if (wait_for_tasks
&& cmd
->transport_wait_for_tasks
)
4426 cmd
->transport_wait_for_tasks(cmd
, 0, 0);
4428 transport_free_dev_tasks(cmd
);
4430 transport_generic_remove(cmd
, session_reinstatement
);
4433 EXPORT_SYMBOL(transport_generic_free_cmd
);
4435 static void transport_nop_wait_for_tasks(
4438 int session_reinstatement
)
4443 /* transport_lun_wait_for_tasks():
4445 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4446 * an struct se_lun to be successfully shutdown.
4448 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4450 unsigned long flags
;
4453 * If the frontend has already requested this struct se_cmd to
4454 * be stopped, we can safely ignore this struct se_cmd.
4456 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4457 if (atomic_read(&cmd
->t_transport_stop
)) {
4458 atomic_set(&cmd
->transport_lun_stop
, 0);
4459 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4460 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4461 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4462 transport_cmd_check_stop(cmd
, 1, 0);
4465 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4466 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4468 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4470 ret
= transport_stop_tasks_for_cmd(cmd
);
4472 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4473 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4475 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4476 cmd
->se_tfo
->get_task_tag(cmd
));
4477 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4478 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4479 cmd
->se_tfo
->get_task_tag(cmd
));
4481 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
4486 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4488 struct se_cmd
*cmd
= NULL
;
4489 unsigned long lun_flags
, cmd_flags
;
4491 * Do exception processing and return CHECK_CONDITION status to the
4494 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4495 while (!list_empty(&lun
->lun_cmd_list
)) {
4496 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4497 struct se_cmd
, se_lun_node
);
4498 list_del(&cmd
->se_lun_node
);
4500 atomic_set(&cmd
->transport_lun_active
, 0);
4502 * This will notify iscsi_target_transport.c:
4503 * transport_cmd_check_stop() that a LUN shutdown is in
4504 * progress for the iscsi_cmd_t.
4506 spin_lock(&cmd
->t_state_lock
);
4507 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4508 "_lun_stop for ITT: 0x%08x\n",
4509 cmd
->se_lun
->unpacked_lun
,
4510 cmd
->se_tfo
->get_task_tag(cmd
));
4511 atomic_set(&cmd
->transport_lun_stop
, 1);
4512 spin_unlock(&cmd
->t_state_lock
);
4514 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4517 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4518 cmd
->se_tfo
->get_task_tag(cmd
),
4519 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4523 * If the Storage engine still owns the iscsi_cmd_t, determine
4524 * and/or stop its context.
4526 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4527 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4528 cmd
->se_tfo
->get_task_tag(cmd
));
4530 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4531 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4535 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4536 "_wait_for_tasks(): SUCCESS\n",
4537 cmd
->se_lun
->unpacked_lun
,
4538 cmd
->se_tfo
->get_task_tag(cmd
));
4540 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4541 if (!atomic_read(&cmd
->transport_dev_active
)) {
4542 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4545 atomic_set(&cmd
->transport_dev_active
, 0);
4546 transport_all_task_dev_remove_state(cmd
);
4547 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4549 transport_free_dev_tasks(cmd
);
4551 * The Storage engine stopped this struct se_cmd before it was
4552 * send to the fabric frontend for delivery back to the
4553 * Initiator Node. Return this SCSI CDB back with an
4554 * CHECK_CONDITION status.
4557 transport_send_check_condition_and_sense(cmd
,
4558 TCM_NON_EXISTENT_LUN
, 0);
4560 * If the fabric frontend is waiting for this iscsi_cmd_t to
4561 * be released, notify the waiting thread now that LU has
4562 * finished accessing it.
4564 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4565 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4566 pr_debug("SE_LUN[%d] - Detected FE stop for"
4567 " struct se_cmd: %p ITT: 0x%08x\n",
4569 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4571 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4573 transport_cmd_check_stop(cmd
, 1, 0);
4574 complete(&cmd
->transport_lun_fe_stop_comp
);
4575 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4578 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4579 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4581 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4582 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4584 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4587 static int transport_clear_lun_thread(void *p
)
4589 struct se_lun
*lun
= (struct se_lun
*)p
;
4591 __transport_clear_lun_from_sessions(lun
);
4592 complete(&lun
->lun_shutdown_comp
);
4597 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4599 struct task_struct
*kt
;
4601 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4602 "tcm_cl_%u", lun
->unpacked_lun
);
4604 pr_err("Unable to start clear_lun thread\n");
4607 wait_for_completion(&lun
->lun_shutdown_comp
);
4612 /* transport_generic_wait_for_tasks():
4614 * Called from frontend or passthrough context to wait for storage engine
4615 * to pause and/or release frontend generated struct se_cmd.
4617 static void transport_generic_wait_for_tasks(
4620 int session_reinstatement
)
4622 unsigned long flags
;
4624 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
))
4627 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4629 * If we are already stopped due to an external event (ie: LUN shutdown)
4630 * sleep until the connection can have the passed struct se_cmd back.
4631 * The cmd->transport_lun_stopped_sem will be upped by
4632 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4633 * has completed its operation on the struct se_cmd.
4635 if (atomic_read(&cmd
->transport_lun_stop
)) {
4637 pr_debug("wait_for_tasks: Stopping"
4638 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4639 "_stop_comp); for ITT: 0x%08x\n",
4640 cmd
->se_tfo
->get_task_tag(cmd
));
4642 * There is a special case for WRITES where a FE exception +
4643 * LUN shutdown means ConfigFS context is still sleeping on
4644 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4645 * We go ahead and up transport_lun_stop_comp just to be sure
4648 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4649 complete(&cmd
->transport_lun_stop_comp
);
4650 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4651 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4653 transport_all_task_dev_remove_state(cmd
);
4655 * At this point, the frontend who was the originator of this
4656 * struct se_cmd, now owns the structure and can be released through
4657 * normal means below.
4659 pr_debug("wait_for_tasks: Stopped"
4660 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4661 "stop_comp); for ITT: 0x%08x\n",
4662 cmd
->se_tfo
->get_task_tag(cmd
));
4664 atomic_set(&cmd
->transport_lun_stop
, 0);
4666 if (!atomic_read(&cmd
->t_transport_active
) ||
4667 atomic_read(&cmd
->t_transport_aborted
))
4670 atomic_set(&cmd
->t_transport_stop
, 1);
4672 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4673 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4674 " = TRUE\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4675 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
,
4676 cmd
->deferred_t_state
);
4678 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4680 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4682 wait_for_completion(&cmd
->t_transport_stop_comp
);
4684 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4685 atomic_set(&cmd
->t_transport_active
, 0);
4686 atomic_set(&cmd
->t_transport_stop
, 0);
4688 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4689 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4690 cmd
->se_tfo
->get_task_tag(cmd
));
4692 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4696 transport_generic_free_cmd(cmd
, 0, session_reinstatement
);
4699 static int transport_get_sense_codes(
4704 *asc
= cmd
->scsi_asc
;
4705 *ascq
= cmd
->scsi_ascq
;
4710 static int transport_set_sense_codes(
4715 cmd
->scsi_asc
= asc
;
4716 cmd
->scsi_ascq
= ascq
;
4721 int transport_send_check_condition_and_sense(
4726 unsigned char *buffer
= cmd
->sense_buffer
;
4727 unsigned long flags
;
4729 u8 asc
= 0, ascq
= 0;
4731 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4732 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4733 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4736 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4737 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4739 if (!reason
&& from_transport
)
4742 if (!from_transport
)
4743 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4745 * Data Segment and SenseLength of the fabric response PDU.
4747 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4748 * from include/scsi/scsi_cmnd.h
4750 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4751 TRANSPORT_SENSE_BUFFER
);
4753 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4754 * SENSE KEY values from include/scsi/scsi.h
4757 case TCM_NON_EXISTENT_LUN
:
4759 buffer
[offset
] = 0x70;
4760 /* ILLEGAL REQUEST */
4761 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4762 /* LOGICAL UNIT NOT SUPPORTED */
4763 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4765 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4766 case TCM_SECTOR_COUNT_TOO_MANY
:
4768 buffer
[offset
] = 0x70;
4769 /* ILLEGAL REQUEST */
4770 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4771 /* INVALID COMMAND OPERATION CODE */
4772 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4774 case TCM_UNKNOWN_MODE_PAGE
:
4776 buffer
[offset
] = 0x70;
4777 /* ILLEGAL REQUEST */
4778 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4779 /* INVALID FIELD IN CDB */
4780 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4782 case TCM_CHECK_CONDITION_ABORT_CMD
:
4784 buffer
[offset
] = 0x70;
4785 /* ABORTED COMMAND */
4786 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4787 /* BUS DEVICE RESET FUNCTION OCCURRED */
4788 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4789 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4791 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4793 buffer
[offset
] = 0x70;
4794 /* ABORTED COMMAND */
4795 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4797 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4798 /* NOT ENOUGH UNSOLICITED DATA */
4799 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4801 case TCM_INVALID_CDB_FIELD
:
4803 buffer
[offset
] = 0x70;
4804 /* ABORTED COMMAND */
4805 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4806 /* INVALID FIELD IN CDB */
4807 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4809 case TCM_INVALID_PARAMETER_LIST
:
4811 buffer
[offset
] = 0x70;
4812 /* ABORTED COMMAND */
4813 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4814 /* INVALID FIELD IN PARAMETER LIST */
4815 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4817 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4819 buffer
[offset
] = 0x70;
4820 /* ABORTED COMMAND */
4821 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4823 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4824 /* UNEXPECTED_UNSOLICITED_DATA */
4825 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4827 case TCM_SERVICE_CRC_ERROR
:
4829 buffer
[offset
] = 0x70;
4830 /* ABORTED COMMAND */
4831 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4832 /* PROTOCOL SERVICE CRC ERROR */
4833 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4835 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4837 case TCM_SNACK_REJECTED
:
4839 buffer
[offset
] = 0x70;
4840 /* ABORTED COMMAND */
4841 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4843 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4844 /* FAILED RETRANSMISSION REQUEST */
4845 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4847 case TCM_WRITE_PROTECTED
:
4849 buffer
[offset
] = 0x70;
4851 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4852 /* WRITE PROTECTED */
4853 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4855 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4857 buffer
[offset
] = 0x70;
4858 /* UNIT ATTENTION */
4859 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4860 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4861 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4862 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4864 case TCM_CHECK_CONDITION_NOT_READY
:
4866 buffer
[offset
] = 0x70;
4868 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4869 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4870 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4871 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4873 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4876 buffer
[offset
] = 0x70;
4877 /* ILLEGAL REQUEST */
4878 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4879 /* LOGICAL UNIT COMMUNICATION FAILURE */
4880 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4884 * This code uses linux/include/scsi/scsi.h SAM status codes!
4886 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4888 * Automatically padded, this value is encoded in the fabric's
4889 * data_length response PDU containing the SCSI defined sense data.
4891 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4894 return cmd
->se_tfo
->queue_status(cmd
);
4896 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4898 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4902 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4904 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4907 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4908 " status for CDB: 0x%02x ITT: 0x%08x\n",
4910 cmd
->se_tfo
->get_task_tag(cmd
));
4912 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4913 cmd
->se_tfo
->queue_status(cmd
);
4918 EXPORT_SYMBOL(transport_check_aborted_status
);
4920 void transport_send_task_abort(struct se_cmd
*cmd
)
4923 * If there are still expected incoming fabric WRITEs, we wait
4924 * until until they have completed before sending a TASK_ABORTED
4925 * response. This response with TASK_ABORTED status will be
4926 * queued back to fabric module by transport_check_aborted_status().
4928 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4929 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4930 atomic_inc(&cmd
->t_transport_aborted
);
4931 smp_mb__after_atomic_inc();
4932 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4933 transport_new_cmd_failure(cmd
);
4937 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4939 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4940 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4941 cmd
->se_tfo
->get_task_tag(cmd
));
4943 cmd
->se_tfo
->queue_status(cmd
);
4946 /* transport_generic_do_tmr():
4950 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4952 struct se_device
*dev
= cmd
->se_dev
;
4953 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4956 switch (tmr
->function
) {
4957 case TMR_ABORT_TASK
:
4958 tmr
->response
= TMR_FUNCTION_REJECTED
;
4960 case TMR_ABORT_TASK_SET
:
4962 case TMR_CLEAR_TASK_SET
:
4963 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4966 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4967 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4968 TMR_FUNCTION_REJECTED
;
4970 case TMR_TARGET_WARM_RESET
:
4971 tmr
->response
= TMR_FUNCTION_REJECTED
;
4973 case TMR_TARGET_COLD_RESET
:
4974 tmr
->response
= TMR_FUNCTION_REJECTED
;
4977 pr_err("Uknown TMR function: 0x%02x.\n",
4979 tmr
->response
= TMR_FUNCTION_REJECTED
;
4983 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4984 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4986 transport_cmd_check_stop(cmd
, 2, 0);
4991 * Called with spin_lock_irq(&dev->execute_task_lock); held
4994 static struct se_task
*
4995 transport_get_task_from_state_list(struct se_device
*dev
)
4997 struct se_task
*task
;
4999 if (list_empty(&dev
->state_task_list
))
5002 list_for_each_entry(task
, &dev
->state_task_list
, t_state_list
)
5005 list_del(&task
->t_state_list
);
5006 atomic_set(&task
->task_state_active
, 0);
5011 static void transport_processing_shutdown(struct se_device
*dev
)
5014 struct se_task
*task
;
5015 unsigned long flags
;
5017 * Empty the struct se_device's struct se_task state list.
5019 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5020 while ((task
= transport_get_task_from_state_list(dev
))) {
5021 if (!task
->task_se_cmd
) {
5022 pr_err("task->task_se_cmd is NULL!\n");
5025 cmd
= task
->task_se_cmd
;
5027 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
5029 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
5031 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
5032 " i_state: %d, t_state/def_t_state:"
5033 " %d/%d cdb: 0x%02x\n", cmd
, task
,
5034 cmd
->se_tfo
->get_task_tag(cmd
),
5035 cmd
->se_tfo
->get_cmd_state(cmd
),
5036 cmd
->t_state
, cmd
->deferred_t_state
,
5037 cmd
->t_task_cdb
[0]);
5038 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
5039 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5040 " t_transport_stop: %d t_transport_sent: %d\n",
5041 cmd
->se_tfo
->get_task_tag(cmd
),
5042 cmd
->t_task_list_num
,
5043 atomic_read(&cmd
->t_task_cdbs_left
),
5044 atomic_read(&cmd
->t_task_cdbs_sent
),
5045 atomic_read(&cmd
->t_transport_active
),
5046 atomic_read(&cmd
->t_transport_stop
),
5047 atomic_read(&cmd
->t_transport_sent
));
5049 if (atomic_read(&task
->task_active
)) {
5050 atomic_set(&task
->task_stop
, 1);
5051 spin_unlock_irqrestore(
5052 &cmd
->t_state_lock
, flags
);
5054 pr_debug("Waiting for task: %p to shutdown for dev:"
5055 " %p\n", task
, dev
);
5056 wait_for_completion(&task
->task_stop_comp
);
5057 pr_debug("Completed task: %p shutdown for dev: %p\n",
5060 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
5061 atomic_dec(&cmd
->t_task_cdbs_left
);
5063 atomic_set(&task
->task_active
, 0);
5064 atomic_set(&task
->task_stop
, 0);
5066 if (atomic_read(&task
->task_execute_queue
) != 0)
5067 transport_remove_task_from_execute_queue(task
, dev
);
5069 __transport_stop_task_timer(task
, &flags
);
5071 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_ex_left
)) {
5072 spin_unlock_irqrestore(
5073 &cmd
->t_state_lock
, flags
);
5075 pr_debug("Skipping task: %p, dev: %p for"
5076 " t_task_cdbs_ex_left: %d\n", task
, dev
,
5077 atomic_read(&cmd
->t_task_cdbs_ex_left
));
5079 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5083 if (atomic_read(&cmd
->t_transport_active
)) {
5084 pr_debug("got t_transport_active = 1 for task: %p, dev:"
5085 " %p\n", task
, dev
);
5087 if (atomic_read(&cmd
->t_fe_count
)) {
5088 spin_unlock_irqrestore(
5089 &cmd
->t_state_lock
, flags
);
5090 transport_send_check_condition_and_sense(
5091 cmd
, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
,
5093 transport_remove_cmd_from_queue(cmd
,
5094 &cmd
->se_dev
->dev_queue_obj
);
5096 transport_lun_remove_cmd(cmd
);
5097 transport_cmd_check_stop(cmd
, 1, 0);
5099 spin_unlock_irqrestore(
5100 &cmd
->t_state_lock
, flags
);
5102 transport_remove_cmd_from_queue(cmd
,
5103 &cmd
->se_dev
->dev_queue_obj
);
5105 transport_lun_remove_cmd(cmd
);
5107 if (transport_cmd_check_stop(cmd
, 1, 0))
5108 transport_generic_remove(cmd
, 0);
5111 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5114 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
5117 if (atomic_read(&cmd
->t_fe_count
)) {
5118 spin_unlock_irqrestore(
5119 &cmd
->t_state_lock
, flags
);
5120 transport_send_check_condition_and_sense(cmd
,
5121 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
5122 transport_remove_cmd_from_queue(cmd
,
5123 &cmd
->se_dev
->dev_queue_obj
);
5125 transport_lun_remove_cmd(cmd
);
5126 transport_cmd_check_stop(cmd
, 1, 0);
5128 spin_unlock_irqrestore(
5129 &cmd
->t_state_lock
, flags
);
5131 transport_remove_cmd_from_queue(cmd
,
5132 &cmd
->se_dev
->dev_queue_obj
);
5133 transport_lun_remove_cmd(cmd
);
5135 if (transport_cmd_check_stop(cmd
, 1, 0))
5136 transport_generic_remove(cmd
, 0);
5139 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5141 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
5143 * Empty the struct se_device's struct se_cmd list.
5145 while ((cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
))) {
5147 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5150 if (atomic_read(&cmd
->t_fe_count
)) {
5151 transport_send_check_condition_and_sense(cmd
,
5152 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
5154 transport_lun_remove_cmd(cmd
);
5155 transport_cmd_check_stop(cmd
, 1, 0);
5157 transport_lun_remove_cmd(cmd
);
5158 if (transport_cmd_check_stop(cmd
, 1, 0))
5159 transport_generic_remove(cmd
, 0);
5164 /* transport_processing_thread():
5168 static int transport_processing_thread(void *param
)
5172 struct se_device
*dev
= (struct se_device
*) param
;
5174 set_user_nice(current
, -20);
5176 while (!kthread_should_stop()) {
5177 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
5178 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
5179 kthread_should_stop());
5183 spin_lock_irq(&dev
->dev_status_lock
);
5184 if (dev
->dev_status
& TRANSPORT_DEVICE_SHUTDOWN
) {
5185 spin_unlock_irq(&dev
->dev_status_lock
);
5186 transport_processing_shutdown(dev
);
5189 spin_unlock_irq(&dev
->dev_status_lock
);
5192 __transport_execute_tasks(dev
);
5194 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
5198 switch (cmd
->t_state
) {
5199 case TRANSPORT_NEW_CMD_MAP
:
5200 if (!cmd
->se_tfo
->new_cmd_map
) {
5201 pr_err("cmd->se_tfo->new_cmd_map is"
5202 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5205 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
5207 cmd
->transport_error_status
= ret
;
5208 transport_generic_request_failure(cmd
, NULL
,
5209 0, (cmd
->data_direction
!=
5214 case TRANSPORT_NEW_CMD
:
5215 ret
= transport_generic_new_cmd(cmd
);
5219 cmd
->transport_error_status
= ret
;
5220 transport_generic_request_failure(cmd
, NULL
,
5221 0, (cmd
->data_direction
!=
5225 case TRANSPORT_PROCESS_WRITE
:
5226 transport_generic_process_write(cmd
);
5228 case TRANSPORT_COMPLETE_OK
:
5229 transport_stop_all_task_timers(cmd
);
5230 transport_generic_complete_ok(cmd
);
5232 case TRANSPORT_REMOVE
:
5233 transport_generic_remove(cmd
, 0);
5235 case TRANSPORT_FREE_CMD_INTR
:
5236 transport_generic_free_cmd(cmd
, 0, 0);
5238 case TRANSPORT_PROCESS_TMR
:
5239 transport_generic_do_tmr(cmd
);
5241 case TRANSPORT_COMPLETE_FAILURE
:
5242 transport_generic_request_failure(cmd
, NULL
, 1, 1);
5244 case TRANSPORT_COMPLETE_TIMEOUT
:
5245 transport_stop_all_task_timers(cmd
);
5246 transport_generic_request_timeout(cmd
);
5248 case TRANSPORT_COMPLETE_QF_WP
:
5249 transport_generic_write_pending(cmd
);
5252 pr_err("Unknown t_state: %d deferred_t_state:"
5253 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5254 " %u\n", cmd
->t_state
, cmd
->deferred_t_state
,
5255 cmd
->se_tfo
->get_task_tag(cmd
),
5256 cmd
->se_tfo
->get_cmd_state(cmd
),
5257 cmd
->se_lun
->unpacked_lun
);
5265 transport_release_all_cmds(dev
);
5266 dev
->process_thread
= NULL
;