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 bool transport_put_cmd(struct se_cmd
*cmd
);
90 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
91 struct se_queue_obj
*qobj
);
92 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
93 static void transport_stop_all_task_timers(struct se_cmd
*cmd
);
95 int init_se_kmem_caches(void)
97 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
98 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
100 pr_err("kmem_cache_create for struct se_cmd failed\n");
103 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
104 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
106 if (!se_tmr_req_cache
) {
107 pr_err("kmem_cache_create() for struct se_tmr_req"
111 se_sess_cache
= kmem_cache_create("se_sess_cache",
112 sizeof(struct se_session
), __alignof__(struct se_session
),
114 if (!se_sess_cache
) {
115 pr_err("kmem_cache_create() for struct se_session"
119 se_ua_cache
= kmem_cache_create("se_ua_cache",
120 sizeof(struct se_ua
), __alignof__(struct se_ua
),
123 pr_err("kmem_cache_create() for struct se_ua failed\n");
126 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
127 sizeof(struct t10_pr_registration
),
128 __alignof__(struct t10_pr_registration
), 0, NULL
);
129 if (!t10_pr_reg_cache
) {
130 pr_err("kmem_cache_create() for struct t10_pr_registration"
134 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
135 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
137 if (!t10_alua_lu_gp_cache
) {
138 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
142 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
143 sizeof(struct t10_alua_lu_gp_member
),
144 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
145 if (!t10_alua_lu_gp_mem_cache
) {
146 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
150 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
151 sizeof(struct t10_alua_tg_pt_gp
),
152 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
153 if (!t10_alua_tg_pt_gp_cache
) {
154 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
158 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
159 "t10_alua_tg_pt_gp_mem_cache",
160 sizeof(struct t10_alua_tg_pt_gp_member
),
161 __alignof__(struct t10_alua_tg_pt_gp_member
),
163 if (!t10_alua_tg_pt_gp_mem_cache
) {
164 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
172 kmem_cache_destroy(se_cmd_cache
);
173 if (se_tmr_req_cache
)
174 kmem_cache_destroy(se_tmr_req_cache
);
176 kmem_cache_destroy(se_sess_cache
);
178 kmem_cache_destroy(se_ua_cache
);
179 if (t10_pr_reg_cache
)
180 kmem_cache_destroy(t10_pr_reg_cache
);
181 if (t10_alua_lu_gp_cache
)
182 kmem_cache_destroy(t10_alua_lu_gp_cache
);
183 if (t10_alua_lu_gp_mem_cache
)
184 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
185 if (t10_alua_tg_pt_gp_cache
)
186 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
187 if (t10_alua_tg_pt_gp_mem_cache
)
188 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
192 void release_se_kmem_caches(void)
194 kmem_cache_destroy(se_cmd_cache
);
195 kmem_cache_destroy(se_tmr_req_cache
);
196 kmem_cache_destroy(se_sess_cache
);
197 kmem_cache_destroy(se_ua_cache
);
198 kmem_cache_destroy(t10_pr_reg_cache
);
199 kmem_cache_destroy(t10_alua_lu_gp_cache
);
200 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
201 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
202 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
205 /* This code ensures unique mib indexes are handed out. */
206 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
207 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
210 * Allocate a new row index for the entry type specified
212 u32
scsi_get_new_index(scsi_index_t type
)
216 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
218 spin_lock(&scsi_mib_index_lock
);
219 new_index
= ++scsi_mib_index
[type
];
220 spin_unlock(&scsi_mib_index_lock
);
225 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
227 atomic_set(&qobj
->queue_cnt
, 0);
228 INIT_LIST_HEAD(&qobj
->qobj_list
);
229 init_waitqueue_head(&qobj
->thread_wq
);
230 spin_lock_init(&qobj
->cmd_queue_lock
);
232 EXPORT_SYMBOL(transport_init_queue_obj
);
234 static int transport_subsystem_reqmods(void)
238 ret
= request_module("target_core_iblock");
240 pr_err("Unable to load target_core_iblock\n");
242 ret
= request_module("target_core_file");
244 pr_err("Unable to load target_core_file\n");
246 ret
= request_module("target_core_pscsi");
248 pr_err("Unable to load target_core_pscsi\n");
250 ret
= request_module("target_core_stgt");
252 pr_err("Unable to load target_core_stgt\n");
257 int transport_subsystem_check_init(void)
261 if (sub_api_initialized
)
264 * Request the loading of known TCM subsystem plugins..
266 ret
= transport_subsystem_reqmods();
270 sub_api_initialized
= 1;
274 struct se_session
*transport_init_session(void)
276 struct se_session
*se_sess
;
278 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
280 pr_err("Unable to allocate struct se_session from"
282 return ERR_PTR(-ENOMEM
);
284 INIT_LIST_HEAD(&se_sess
->sess_list
);
285 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
289 EXPORT_SYMBOL(transport_init_session
);
292 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
294 void __transport_register_session(
295 struct se_portal_group
*se_tpg
,
296 struct se_node_acl
*se_nacl
,
297 struct se_session
*se_sess
,
298 void *fabric_sess_ptr
)
300 unsigned char buf
[PR_REG_ISID_LEN
];
302 se_sess
->se_tpg
= se_tpg
;
303 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
305 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
307 * Only set for struct se_session's that will actually be moving I/O.
308 * eg: *NOT* discovery sessions.
312 * If the fabric module supports an ISID based TransportID,
313 * save this value in binary from the fabric I_T Nexus now.
315 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
316 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
317 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
318 &buf
[0], PR_REG_ISID_LEN
);
319 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
321 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
323 * The se_nacl->nacl_sess pointer will be set to the
324 * last active I_T Nexus for each struct se_node_acl.
326 se_nacl
->nacl_sess
= se_sess
;
328 list_add_tail(&se_sess
->sess_acl_list
,
329 &se_nacl
->acl_sess_list
);
330 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
332 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
334 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
335 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
337 EXPORT_SYMBOL(__transport_register_session
);
339 void transport_register_session(
340 struct se_portal_group
*se_tpg
,
341 struct se_node_acl
*se_nacl
,
342 struct se_session
*se_sess
,
343 void *fabric_sess_ptr
)
345 spin_lock_bh(&se_tpg
->session_lock
);
346 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
347 spin_unlock_bh(&se_tpg
->session_lock
);
349 EXPORT_SYMBOL(transport_register_session
);
351 void transport_deregister_session_configfs(struct se_session
*se_sess
)
353 struct se_node_acl
*se_nacl
;
356 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
358 se_nacl
= se_sess
->se_node_acl
;
360 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
361 list_del(&se_sess
->sess_acl_list
);
363 * If the session list is empty, then clear the pointer.
364 * Otherwise, set the struct se_session pointer from the tail
365 * element of the per struct se_node_acl active session list.
367 if (list_empty(&se_nacl
->acl_sess_list
))
368 se_nacl
->nacl_sess
= NULL
;
370 se_nacl
->nacl_sess
= container_of(
371 se_nacl
->acl_sess_list
.prev
,
372 struct se_session
, sess_acl_list
);
374 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
377 EXPORT_SYMBOL(transport_deregister_session_configfs
);
379 void transport_free_session(struct se_session
*se_sess
)
381 kmem_cache_free(se_sess_cache
, se_sess
);
383 EXPORT_SYMBOL(transport_free_session
);
385 void transport_deregister_session(struct se_session
*se_sess
)
387 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
388 struct se_node_acl
*se_nacl
;
392 transport_free_session(se_sess
);
396 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
397 list_del(&se_sess
->sess_list
);
398 se_sess
->se_tpg
= NULL
;
399 se_sess
->fabric_sess_ptr
= NULL
;
400 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
403 * Determine if we need to do extra work for this initiator node's
404 * struct se_node_acl if it had been previously dynamically generated.
406 se_nacl
= se_sess
->se_node_acl
;
408 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
409 if (se_nacl
->dynamic_node_acl
) {
410 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
412 list_del(&se_nacl
->acl_list
);
413 se_tpg
->num_node_acls
--;
414 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
416 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
417 core_free_device_list_for_node(se_nacl
, se_tpg
);
418 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
420 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
423 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
426 transport_free_session(se_sess
);
428 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
429 se_tpg
->se_tpg_tfo
->get_fabric_name());
431 EXPORT_SYMBOL(transport_deregister_session
);
434 * Called with cmd->t_state_lock held.
436 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
438 struct se_device
*dev
;
439 struct se_task
*task
;
442 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
447 if (atomic_read(&task
->task_active
))
450 if (!atomic_read(&task
->task_state_active
))
453 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
454 list_del(&task
->t_state_list
);
455 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
456 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
457 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
459 atomic_set(&task
->task_state_active
, 0);
460 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
464 /* transport_cmd_check_stop():
466 * 'transport_off = 1' determines if t_transport_active should be cleared.
467 * 'transport_off = 2' determines if task_dev_state should be removed.
469 * A non-zero u8 t_state sets cmd->t_state.
470 * Returns 1 when command is stopped, else 0.
472 static int transport_cmd_check_stop(
479 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
481 * Determine if IOCTL context caller in requesting the stopping of this
482 * command for LUN shutdown purposes.
484 if (atomic_read(&cmd
->transport_lun_stop
)) {
485 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
486 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
487 cmd
->se_tfo
->get_task_tag(cmd
));
489 cmd
->deferred_t_state
= cmd
->t_state
;
490 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
491 atomic_set(&cmd
->t_transport_active
, 0);
492 if (transport_off
== 2)
493 transport_all_task_dev_remove_state(cmd
);
494 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
496 complete(&cmd
->transport_lun_stop_comp
);
500 * Determine if frontend context caller is requesting the stopping of
501 * this command for frontend exceptions.
503 if (atomic_read(&cmd
->t_transport_stop
)) {
504 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
505 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
506 cmd
->se_tfo
->get_task_tag(cmd
));
508 cmd
->deferred_t_state
= cmd
->t_state
;
509 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
510 if (transport_off
== 2)
511 transport_all_task_dev_remove_state(cmd
);
514 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
517 if (transport_off
== 2)
519 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
521 complete(&cmd
->t_transport_stop_comp
);
525 atomic_set(&cmd
->t_transport_active
, 0);
526 if (transport_off
== 2) {
527 transport_all_task_dev_remove_state(cmd
);
529 * Clear struct se_cmd->se_lun before the transport_off == 2
530 * handoff to fabric module.
534 * Some fabric modules like tcm_loop can release
535 * their internally allocated I/O reference now and
538 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
539 spin_unlock_irqrestore(
540 &cmd
->t_state_lock
, flags
);
542 cmd
->se_tfo
->check_stop_free(cmd
);
546 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
550 cmd
->t_state
= t_state
;
551 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
556 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
558 return transport_cmd_check_stop(cmd
, 2, 0);
561 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
563 struct se_lun
*lun
= cmd
->se_lun
;
569 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
570 if (!atomic_read(&cmd
->transport_dev_active
)) {
571 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
574 atomic_set(&cmd
->transport_dev_active
, 0);
575 transport_all_task_dev_remove_state(cmd
);
576 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
580 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
581 if (atomic_read(&cmd
->transport_lun_active
)) {
582 list_del(&cmd
->se_lun_node
);
583 atomic_set(&cmd
->transport_lun_active
, 0);
585 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
586 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
589 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
592 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
594 transport_lun_remove_cmd(cmd
);
596 if (transport_cmd_check_stop_to_fabric(cmd
))
599 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
600 transport_put_cmd(cmd
);
604 void transport_cmd_finish_abort_tmr(struct se_cmd
*cmd
)
606 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
608 if (transport_cmd_check_stop_to_fabric(cmd
))
611 transport_put_cmd(cmd
);
614 static void transport_add_cmd_to_queue(
618 struct se_device
*dev
= cmd
->se_dev
;
619 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
623 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
624 cmd
->t_state
= t_state
;
625 atomic_set(&cmd
->t_transport_active
, 1);
626 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
629 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
631 /* If the cmd is already on the list, remove it before we add it */
632 if (!list_empty(&cmd
->se_queue_node
))
633 list_del(&cmd
->se_queue_node
);
635 atomic_inc(&qobj
->queue_cnt
);
637 if (cmd
->se_cmd_flags
& SCF_EMULATE_QUEUE_FULL
) {
638 cmd
->se_cmd_flags
&= ~SCF_EMULATE_QUEUE_FULL
;
639 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
641 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
642 atomic_set(&cmd
->t_transport_queue_active
, 1);
643 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
645 wake_up_interruptible(&qobj
->thread_wq
);
648 static struct se_cmd
*
649 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
654 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
655 if (list_empty(&qobj
->qobj_list
)) {
656 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
659 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
661 atomic_set(&cmd
->t_transport_queue_active
, 0);
663 list_del_init(&cmd
->se_queue_node
);
664 atomic_dec(&qobj
->queue_cnt
);
665 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
670 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
671 struct se_queue_obj
*qobj
)
675 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
676 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
677 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
680 atomic_set(&cmd
->t_transport_queue_active
, 0);
681 atomic_dec(&qobj
->queue_cnt
);
682 list_del_init(&cmd
->se_queue_node
);
683 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
685 if (atomic_read(&cmd
->t_transport_queue_active
)) {
686 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
687 cmd
->se_tfo
->get_task_tag(cmd
),
688 atomic_read(&cmd
->t_transport_queue_active
));
693 * Completion function used by TCM subsystem plugins (such as FILEIO)
694 * for queueing up response from struct se_subsystem_api->do_task()
696 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
698 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
699 struct se_task
, t_list
);
702 cmd
->scsi_status
= SAM_STAT_GOOD
;
703 task
->task_scsi_status
= GOOD
;
705 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
706 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
707 task
->task_se_cmd
->transport_error_status
=
708 PYX_TRANSPORT_ILLEGAL_REQUEST
;
711 transport_complete_task(task
, good
);
713 EXPORT_SYMBOL(transport_complete_sync_cache
);
715 /* transport_complete_task():
717 * Called from interrupt and non interrupt context depending
718 * on the transport plugin.
720 void transport_complete_task(struct se_task
*task
, int success
)
722 struct se_cmd
*cmd
= task
->task_se_cmd
;
723 struct se_device
*dev
= task
->se_dev
;
727 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
728 cmd
->t_task_cdb
[0], dev
);
731 atomic_inc(&dev
->depth_left
);
733 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
734 atomic_set(&task
->task_active
, 0);
737 * See if any sense data exists, if so set the TASK_SENSE flag.
738 * Also check for any other post completion work that needs to be
739 * done by the plugins.
741 if (dev
&& dev
->transport
->transport_complete
) {
742 if (dev
->transport
->transport_complete(task
) != 0) {
743 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
744 task
->task_sense
= 1;
750 * See if we are waiting for outstanding struct se_task
751 * to complete for an exception condition
753 if (atomic_read(&task
->task_stop
)) {
755 * Decrement cmd->t_se_count if this task had
756 * previously thrown its timeout exception handler.
758 if (atomic_read(&task
->task_timeout
)) {
759 atomic_dec(&cmd
->t_se_count
);
760 atomic_set(&task
->task_timeout
, 0);
762 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
764 complete(&task
->task_stop_comp
);
768 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
769 * left counter to determine when the struct se_cmd is ready to be queued to
770 * the processing thread.
772 if (atomic_read(&task
->task_timeout
)) {
773 if (!atomic_dec_and_test(
774 &cmd
->t_task_cdbs_timeout_left
)) {
775 spin_unlock_irqrestore(&cmd
->t_state_lock
,
779 t_state
= TRANSPORT_COMPLETE_TIMEOUT
;
780 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
782 transport_add_cmd_to_queue(cmd
, t_state
);
785 atomic_dec(&cmd
->t_task_cdbs_timeout_left
);
788 * Decrement the outstanding t_task_cdbs_left count. The last
789 * struct se_task from struct se_cmd will complete itself into the
790 * device queue depending upon int success.
792 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
794 cmd
->t_tasks_failed
= 1;
796 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
800 if (!success
|| cmd
->t_tasks_failed
) {
801 t_state
= TRANSPORT_COMPLETE_FAILURE
;
802 if (!task
->task_error_status
) {
803 task
->task_error_status
=
804 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
805 cmd
->transport_error_status
=
806 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
809 atomic_set(&cmd
->t_transport_complete
, 1);
810 t_state
= TRANSPORT_COMPLETE_OK
;
812 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
814 transport_add_cmd_to_queue(cmd
, t_state
);
816 EXPORT_SYMBOL(transport_complete_task
);
819 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
820 * struct se_task list are ready to be added to the active execution list
823 * Called with se_dev_t->execute_task_lock called.
825 static inline int transport_add_task_check_sam_attr(
826 struct se_task
*task
,
827 struct se_task
*task_prev
,
828 struct se_device
*dev
)
831 * No SAM Task attribute emulation enabled, add to tail of
834 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
835 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
839 * HEAD_OF_QUEUE attribute for received CDB, which means
840 * the first task that is associated with a struct se_cmd goes to
841 * head of the struct se_device->execute_task_list, and task_prev
842 * after that for each subsequent task
844 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
845 list_add(&task
->t_execute_list
,
846 (task_prev
!= NULL
) ?
847 &task_prev
->t_execute_list
:
848 &dev
->execute_task_list
);
850 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
851 " in execution queue\n",
852 task
->task_se_cmd
->t_task_cdb
[0]);
856 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
857 * transitioned from Dermant -> Active state, and are added to the end
858 * of the struct se_device->execute_task_list
860 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
864 /* __transport_add_task_to_execute_queue():
866 * Called with se_dev_t->execute_task_lock called.
868 static void __transport_add_task_to_execute_queue(
869 struct se_task
*task
,
870 struct se_task
*task_prev
,
871 struct se_device
*dev
)
875 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
876 atomic_inc(&dev
->execute_tasks
);
878 if (atomic_read(&task
->task_state_active
))
881 * Determine if this task needs to go to HEAD_OF_QUEUE for the
882 * state list as well. Running with SAM Task Attribute emulation
883 * will always return head_of_queue == 0 here
886 list_add(&task
->t_state_list
, (task_prev
) ?
887 &task_prev
->t_state_list
:
888 &dev
->state_task_list
);
890 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
892 atomic_set(&task
->task_state_active
, 1);
894 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
895 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
899 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
901 struct se_device
*dev
;
902 struct se_task
*task
;
905 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
906 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
909 if (atomic_read(&task
->task_state_active
))
912 spin_lock(&dev
->execute_task_lock
);
913 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
914 atomic_set(&task
->task_state_active
, 1);
916 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
917 task
->task_se_cmd
->se_tfo
->get_task_tag(
918 task
->task_se_cmd
), task
, dev
);
920 spin_unlock(&dev
->execute_task_lock
);
922 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
925 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
927 struct se_device
*dev
= cmd
->se_dev
;
928 struct se_task
*task
, *task_prev
= NULL
;
931 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
932 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
933 if (atomic_read(&task
->task_execute_queue
))
936 * __transport_add_task_to_execute_queue() handles the
937 * SAM Task Attribute emulation if enabled
939 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
940 atomic_set(&task
->task_execute_queue
, 1);
943 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
946 /* transport_remove_task_from_execute_queue():
950 void transport_remove_task_from_execute_queue(
951 struct se_task
*task
,
952 struct se_device
*dev
)
956 if (atomic_read(&task
->task_execute_queue
) == 0) {
961 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
962 list_del(&task
->t_execute_list
);
963 atomic_set(&task
->task_execute_queue
, 0);
964 atomic_dec(&dev
->execute_tasks
);
965 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
969 * Handle QUEUE_FULL / -EAGAIN status
972 static void target_qf_do_work(struct work_struct
*work
)
974 struct se_device
*dev
= container_of(work
, struct se_device
,
976 LIST_HEAD(qf_cmd_list
);
977 struct se_cmd
*cmd
, *cmd_tmp
;
979 spin_lock_irq(&dev
->qf_cmd_lock
);
980 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
981 spin_unlock_irq(&dev
->qf_cmd_lock
);
983 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
984 list_del(&cmd
->se_qf_node
);
985 atomic_dec(&dev
->dev_qf_count
);
986 smp_mb__after_atomic_dec();
988 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
989 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
990 (cmd
->t_state
== TRANSPORT_COMPLETE_OK
) ? "COMPLETE_OK" :
991 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
994 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
995 * has been added to head of queue
997 transport_add_cmd_to_queue(cmd
, cmd
->t_state
);
1001 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
1003 switch (cmd
->data_direction
) {
1006 case DMA_FROM_DEVICE
:
1010 case DMA_BIDIRECTIONAL
:
1019 void transport_dump_dev_state(
1020 struct se_device
*dev
,
1024 *bl
+= sprintf(b
+ *bl
, "Status: ");
1025 switch (dev
->dev_status
) {
1026 case TRANSPORT_DEVICE_ACTIVATED
:
1027 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1029 case TRANSPORT_DEVICE_DEACTIVATED
:
1030 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1032 case TRANSPORT_DEVICE_SHUTDOWN
:
1033 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1035 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1036 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1037 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1040 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1044 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1045 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1047 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1048 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1049 *bl
+= sprintf(b
+ *bl
, " ");
1052 /* transport_release_all_cmds():
1056 static void transport_release_all_cmds(struct se_device
*dev
)
1058 struct se_cmd
*cmd
, *tcmd
;
1059 int bug_out
= 0, t_state
;
1060 unsigned long flags
;
1062 spin_lock_irqsave(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1063 list_for_each_entry_safe(cmd
, tcmd
, &dev
->dev_queue_obj
.qobj_list
,
1065 t_state
= cmd
->t_state
;
1066 list_del_init(&cmd
->se_queue_node
);
1067 spin_unlock_irqrestore(&dev
->dev_queue_obj
.cmd_queue_lock
,
1070 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
1071 " t_state: %u directly\n",
1072 cmd
->se_tfo
->get_task_tag(cmd
),
1073 cmd
->se_tfo
->get_cmd_state(cmd
), t_state
);
1075 transport_put_cmd(cmd
);
1078 spin_lock_irqsave(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1080 spin_unlock_irqrestore(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1087 void transport_dump_vpd_proto_id(
1088 struct t10_vpd
*vpd
,
1089 unsigned char *p_buf
,
1092 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1095 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1096 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1098 switch (vpd
->protocol_identifier
) {
1100 sprintf(buf
+len
, "Fibre Channel\n");
1103 sprintf(buf
+len
, "Parallel SCSI\n");
1106 sprintf(buf
+len
, "SSA\n");
1109 sprintf(buf
+len
, "IEEE 1394\n");
1112 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1116 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1119 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1122 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1126 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1129 sprintf(buf
+len
, "Unknown 0x%02x\n",
1130 vpd
->protocol_identifier
);
1135 strncpy(p_buf
, buf
, p_buf_len
);
1137 pr_debug("%s", buf
);
1141 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1144 * Check if the Protocol Identifier Valid (PIV) bit is set..
1146 * from spc3r23.pdf section 7.5.1
1148 if (page_83
[1] & 0x80) {
1149 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1150 vpd
->protocol_identifier_set
= 1;
1151 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1154 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1156 int transport_dump_vpd_assoc(
1157 struct t10_vpd
*vpd
,
1158 unsigned char *p_buf
,
1161 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1165 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1166 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1168 switch (vpd
->association
) {
1170 sprintf(buf
+len
, "addressed logical unit\n");
1173 sprintf(buf
+len
, "target port\n");
1176 sprintf(buf
+len
, "SCSI target device\n");
1179 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1185 strncpy(p_buf
, buf
, p_buf_len
);
1187 pr_debug("%s", buf
);
1192 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1195 * The VPD identification association..
1197 * from spc3r23.pdf Section 7.6.3.1 Table 297
1199 vpd
->association
= (page_83
[1] & 0x30);
1200 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1202 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1204 int transport_dump_vpd_ident_type(
1205 struct t10_vpd
*vpd
,
1206 unsigned char *p_buf
,
1209 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1213 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1214 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1216 switch (vpd
->device_identifier_type
) {
1218 sprintf(buf
+len
, "Vendor specific\n");
1221 sprintf(buf
+len
, "T10 Vendor ID based\n");
1224 sprintf(buf
+len
, "EUI-64 based\n");
1227 sprintf(buf
+len
, "NAA\n");
1230 sprintf(buf
+len
, "Relative target port identifier\n");
1233 sprintf(buf
+len
, "SCSI name string\n");
1236 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1237 vpd
->device_identifier_type
);
1243 if (p_buf_len
< strlen(buf
)+1)
1245 strncpy(p_buf
, buf
, p_buf_len
);
1247 pr_debug("%s", buf
);
1253 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1256 * The VPD identifier type..
1258 * from spc3r23.pdf Section 7.6.3.1 Table 298
1260 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1261 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1263 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1265 int transport_dump_vpd_ident(
1266 struct t10_vpd
*vpd
,
1267 unsigned char *p_buf
,
1270 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1273 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1275 switch (vpd
->device_identifier_code_set
) {
1276 case 0x01: /* Binary */
1277 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1278 &vpd
->device_identifier
[0]);
1280 case 0x02: /* ASCII */
1281 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1282 &vpd
->device_identifier
[0]);
1284 case 0x03: /* UTF-8 */
1285 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1286 &vpd
->device_identifier
[0]);
1289 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1290 " 0x%02x", vpd
->device_identifier_code_set
);
1296 strncpy(p_buf
, buf
, p_buf_len
);
1298 pr_debug("%s", buf
);
1304 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1306 static const char hex_str
[] = "0123456789abcdef";
1307 int j
= 0, i
= 4; /* offset to start of the identifer */
1310 * The VPD Code Set (encoding)
1312 * from spc3r23.pdf Section 7.6.3.1 Table 296
1314 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1315 switch (vpd
->device_identifier_code_set
) {
1316 case 0x01: /* Binary */
1317 vpd
->device_identifier
[j
++] =
1318 hex_str
[vpd
->device_identifier_type
];
1319 while (i
< (4 + page_83
[3])) {
1320 vpd
->device_identifier
[j
++] =
1321 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1322 vpd
->device_identifier
[j
++] =
1323 hex_str
[page_83
[i
] & 0x0f];
1327 case 0x02: /* ASCII */
1328 case 0x03: /* UTF-8 */
1329 while (i
< (4 + page_83
[3]))
1330 vpd
->device_identifier
[j
++] = page_83
[i
++];
1336 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1338 EXPORT_SYMBOL(transport_set_vpd_ident
);
1340 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1343 * If this device is from Target_Core_Mod/pSCSI, disable the
1344 * SAM Task Attribute emulation.
1346 * This is currently not available in upsream Linux/SCSI Target
1347 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1349 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1350 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1354 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1355 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1356 " device\n", dev
->transport
->name
,
1357 dev
->transport
->get_device_rev(dev
));
1360 static void scsi_dump_inquiry(struct se_device
*dev
)
1362 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1365 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1367 pr_debug(" Vendor: ");
1368 for (i
= 0; i
< 8; i
++)
1369 if (wwn
->vendor
[i
] >= 0x20)
1370 pr_debug("%c", wwn
->vendor
[i
]);
1374 pr_debug(" Model: ");
1375 for (i
= 0; i
< 16; i
++)
1376 if (wwn
->model
[i
] >= 0x20)
1377 pr_debug("%c", wwn
->model
[i
]);
1381 pr_debug(" Revision: ");
1382 for (i
= 0; i
< 4; i
++)
1383 if (wwn
->revision
[i
] >= 0x20)
1384 pr_debug("%c", wwn
->revision
[i
]);
1390 device_type
= dev
->transport
->get_device_type(dev
);
1391 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1392 pr_debug(" ANSI SCSI revision: %02x\n",
1393 dev
->transport
->get_device_rev(dev
));
1396 struct se_device
*transport_add_device_to_core_hba(
1398 struct se_subsystem_api
*transport
,
1399 struct se_subsystem_dev
*se_dev
,
1401 void *transport_dev
,
1402 struct se_dev_limits
*dev_limits
,
1403 const char *inquiry_prod
,
1404 const char *inquiry_rev
)
1407 struct se_device
*dev
;
1409 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1411 pr_err("Unable to allocate memory for se_dev_t\n");
1415 transport_init_queue_obj(&dev
->dev_queue_obj
);
1416 dev
->dev_flags
= device_flags
;
1417 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1418 dev
->dev_ptr
= transport_dev
;
1420 dev
->se_sub_dev
= se_dev
;
1421 dev
->transport
= transport
;
1422 atomic_set(&dev
->active_cmds
, 0);
1423 INIT_LIST_HEAD(&dev
->dev_list
);
1424 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1425 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1426 INIT_LIST_HEAD(&dev
->execute_task_list
);
1427 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1428 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1429 INIT_LIST_HEAD(&dev
->state_task_list
);
1430 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1431 spin_lock_init(&dev
->execute_task_lock
);
1432 spin_lock_init(&dev
->delayed_cmd_lock
);
1433 spin_lock_init(&dev
->ordered_cmd_lock
);
1434 spin_lock_init(&dev
->state_task_lock
);
1435 spin_lock_init(&dev
->dev_alua_lock
);
1436 spin_lock_init(&dev
->dev_reservation_lock
);
1437 spin_lock_init(&dev
->dev_status_lock
);
1438 spin_lock_init(&dev
->dev_status_thr_lock
);
1439 spin_lock_init(&dev
->se_port_lock
);
1440 spin_lock_init(&dev
->se_tmr_lock
);
1441 spin_lock_init(&dev
->qf_cmd_lock
);
1443 dev
->queue_depth
= dev_limits
->queue_depth
;
1444 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1445 atomic_set(&dev
->dev_ordered_id
, 0);
1447 se_dev_set_default_attribs(dev
, dev_limits
);
1449 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1450 dev
->creation_time
= get_jiffies_64();
1451 spin_lock_init(&dev
->stats_lock
);
1453 spin_lock(&hba
->device_lock
);
1454 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1456 spin_unlock(&hba
->device_lock
);
1458 * Setup the SAM Task Attribute emulation for struct se_device
1460 core_setup_task_attr_emulation(dev
);
1462 * Force PR and ALUA passthrough emulation with internal object use.
1464 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1466 * Setup the Reservations infrastructure for struct se_device
1468 core_setup_reservations(dev
, force_pt
);
1470 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1472 if (core_setup_alua(dev
, force_pt
) < 0)
1476 * Startup the struct se_device processing thread
1478 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1479 "LIO_%s", dev
->transport
->name
);
1480 if (IS_ERR(dev
->process_thread
)) {
1481 pr_err("Unable to create kthread: LIO_%s\n",
1482 dev
->transport
->name
);
1486 * Setup work_queue for QUEUE_FULL
1488 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1490 * Preload the initial INQUIRY const values if we are doing
1491 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1492 * passthrough because this is being provided by the backend LLD.
1493 * This is required so that transport_get_inquiry() copies these
1494 * originals once back into DEV_T10_WWN(dev) for the virtual device
1497 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1498 if (!inquiry_prod
|| !inquiry_rev
) {
1499 pr_err("All non TCM/pSCSI plugins require"
1500 " INQUIRY consts\n");
1504 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1505 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1506 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1508 scsi_dump_inquiry(dev
);
1512 kthread_stop(dev
->process_thread
);
1514 spin_lock(&hba
->device_lock
);
1515 list_del(&dev
->dev_list
);
1517 spin_unlock(&hba
->device_lock
);
1519 se_release_vpd_for_dev(dev
);
1525 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1527 /* transport_generic_prepare_cdb():
1529 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1530 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1531 * The point of this is since we are mapping iSCSI LUNs to
1532 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1533 * devices and HBAs for a loop.
1535 static inline void transport_generic_prepare_cdb(
1539 case READ_10
: /* SBC - RDProtect */
1540 case READ_12
: /* SBC - RDProtect */
1541 case READ_16
: /* SBC - RDProtect */
1542 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1543 case VERIFY
: /* SBC - VRProtect */
1544 case VERIFY_16
: /* SBC - VRProtect */
1545 case WRITE_VERIFY
: /* SBC - VRProtect */
1546 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1549 cdb
[1] &= 0x1f; /* clear logical unit number */
1554 static struct se_task
*
1555 transport_generic_get_task(struct se_cmd
*cmd
,
1556 enum dma_data_direction data_direction
)
1558 struct se_task
*task
;
1559 struct se_device
*dev
= cmd
->se_dev
;
1561 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1563 pr_err("Unable to allocate struct se_task\n");
1567 INIT_LIST_HEAD(&task
->t_list
);
1568 INIT_LIST_HEAD(&task
->t_execute_list
);
1569 INIT_LIST_HEAD(&task
->t_state_list
);
1570 init_completion(&task
->task_stop_comp
);
1571 task
->task_se_cmd
= cmd
;
1573 task
->task_data_direction
= data_direction
;
1578 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1581 * Used by fabric modules containing a local struct se_cmd within their
1582 * fabric dependent per I/O descriptor.
1584 void transport_init_se_cmd(
1586 struct target_core_fabric_ops
*tfo
,
1587 struct se_session
*se_sess
,
1591 unsigned char *sense_buffer
)
1593 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1594 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1595 INIT_LIST_HEAD(&cmd
->se_ordered_node
);
1596 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1597 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1599 INIT_LIST_HEAD(&cmd
->t_task_list
);
1600 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1601 init_completion(&cmd
->transport_lun_stop_comp
);
1602 init_completion(&cmd
->t_transport_stop_comp
);
1603 spin_lock_init(&cmd
->t_state_lock
);
1604 atomic_set(&cmd
->transport_dev_active
, 1);
1607 cmd
->se_sess
= se_sess
;
1608 cmd
->data_length
= data_length
;
1609 cmd
->data_direction
= data_direction
;
1610 cmd
->sam_task_attr
= task_attr
;
1611 cmd
->sense_buffer
= sense_buffer
;
1613 EXPORT_SYMBOL(transport_init_se_cmd
);
1615 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1618 * Check if SAM Task Attribute emulation is enabled for this
1619 * struct se_device storage object
1621 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1624 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1625 pr_debug("SAM Task Attribute ACA"
1626 " emulation is not supported\n");
1630 * Used to determine when ORDERED commands should go from
1631 * Dormant to Active status.
1633 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1634 smp_mb__after_atomic_inc();
1635 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1636 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1637 cmd
->se_dev
->transport
->name
);
1641 static void transport_generic_wait_for_tasks(struct se_cmd
*, int, int);
1643 /* transport_generic_allocate_tasks():
1645 * Called from fabric RX Thread.
1647 int transport_generic_allocate_tasks(
1653 transport_generic_prepare_cdb(cdb
);
1656 * This is needed for early exceptions.
1658 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1661 * Ensure that the received CDB is less than the max (252 + 8) bytes
1662 * for VARIABLE_LENGTH_CMD
1664 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1665 pr_err("Received SCSI CDB with command_size: %d that"
1666 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1667 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1671 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1672 * allocate the additional extended CDB buffer now.. Otherwise
1673 * setup the pointer from __t_task_cdb to t_task_cdb.
1675 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1676 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1678 if (!cmd
->t_task_cdb
) {
1679 pr_err("Unable to allocate cmd->t_task_cdb"
1680 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1681 scsi_command_size(cdb
),
1682 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1686 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1688 * Copy the original CDB into cmd->
1690 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1692 * Setup the received CDB based on SCSI defined opcodes and
1693 * perform unit attention, persistent reservations and ALUA
1694 * checks for virtual device backends. The cmd->t_task_cdb
1695 * pointer is expected to be setup before we reach this point.
1697 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1701 * Check for SAM Task Attribute Emulation
1703 if (transport_check_alloc_task_attr(cmd
) < 0) {
1704 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1705 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1708 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1709 if (cmd
->se_lun
->lun_sep
)
1710 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1711 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1714 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1716 static void transport_generic_request_failure(struct se_cmd
*,
1717 struct se_device
*, int, int);
1719 * Used by fabric module frontends to queue tasks directly.
1720 * Many only be used from process context only
1722 int transport_handle_cdb_direct(
1729 pr_err("cmd->se_lun is NULL\n");
1732 if (in_interrupt()) {
1734 pr_err("transport_generic_handle_cdb cannot be called"
1735 " from interrupt context\n");
1739 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1740 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1741 * in existing usage to ensure that outstanding descriptors are handled
1742 * correctly during shutdown via transport_generic_wait_for_tasks()
1744 * Also, we don't take cmd->t_state_lock here as we only expect
1745 * this to be called for initial descriptor submission.
1747 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1748 atomic_set(&cmd
->t_transport_active
, 1);
1750 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1751 * so follow TRANSPORT_NEW_CMD processing thread context usage
1752 * and call transport_generic_request_failure() if necessary..
1754 ret
= transport_generic_new_cmd(cmd
);
1758 cmd
->transport_error_status
= ret
;
1759 transport_generic_request_failure(cmd
, NULL
, 0,
1760 (cmd
->data_direction
!= DMA_TO_DEVICE
));
1764 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1767 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1768 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1769 * complete setup in TCM process context w/ TFO->new_cmd_map().
1771 int transport_generic_handle_cdb_map(
1776 pr_err("cmd->se_lun is NULL\n");
1780 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
);
1783 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1785 /* transport_generic_handle_data():
1789 int transport_generic_handle_data(
1793 * For the software fabric case, then we assume the nexus is being
1794 * failed/shutdown when signals are pending from the kthread context
1795 * caller, so we return a failure. For the HW target mode case running
1796 * in interrupt code, the signal_pending() check is skipped.
1798 if (!in_interrupt() && signal_pending(current
))
1801 * If the received CDB has aleady been ABORTED by the generic
1802 * target engine, we now call transport_check_aborted_status()
1803 * to queue any delated TASK_ABORTED status for the received CDB to the
1804 * fabric module as we are expecting no further incoming DATA OUT
1805 * sequences at this point.
1807 if (transport_check_aborted_status(cmd
, 1) != 0)
1810 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
);
1813 EXPORT_SYMBOL(transport_generic_handle_data
);
1815 /* transport_generic_handle_tmr():
1819 int transport_generic_handle_tmr(
1823 * This is needed for early exceptions.
1825 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1827 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
);
1830 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1832 void transport_generic_free_cmd_intr(
1835 transport_add_cmd_to_queue(cmd
, TRANSPORT_FREE_CMD_INTR
);
1837 EXPORT_SYMBOL(transport_generic_free_cmd_intr
);
1839 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1841 struct se_task
*task
, *task_tmp
;
1842 unsigned long flags
;
1845 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1846 cmd
->se_tfo
->get_task_tag(cmd
));
1849 * No tasks remain in the execution queue
1851 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1852 list_for_each_entry_safe(task
, task_tmp
,
1853 &cmd
->t_task_list
, t_list
) {
1854 pr_debug("task_no[%d] - Processing task %p\n",
1855 task
->task_no
, task
);
1857 * If the struct se_task has not been sent and is not active,
1858 * remove the struct se_task from the execution queue.
1860 if (!atomic_read(&task
->task_sent
) &&
1861 !atomic_read(&task
->task_active
)) {
1862 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1864 transport_remove_task_from_execute_queue(task
,
1867 pr_debug("task_no[%d] - Removed from execute queue\n",
1869 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1874 * If the struct se_task is active, sleep until it is returned
1877 if (atomic_read(&task
->task_active
)) {
1878 atomic_set(&task
->task_stop
, 1);
1879 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1882 pr_debug("task_no[%d] - Waiting to complete\n",
1884 wait_for_completion(&task
->task_stop_comp
);
1885 pr_debug("task_no[%d] - Stopped successfully\n",
1888 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1889 atomic_dec(&cmd
->t_task_cdbs_left
);
1891 atomic_set(&task
->task_active
, 0);
1892 atomic_set(&task
->task_stop
, 0);
1894 pr_debug("task_no[%d] - Did nothing\n", task
->task_no
);
1898 __transport_stop_task_timer(task
, &flags
);
1900 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1906 * Handle SAM-esque emulation for generic transport request failures.
1908 static void transport_generic_request_failure(
1910 struct se_device
*dev
,
1916 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1917 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1918 cmd
->t_task_cdb
[0]);
1919 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1920 " %d/%d transport_error_status: %d\n",
1921 cmd
->se_tfo
->get_cmd_state(cmd
),
1922 cmd
->t_state
, cmd
->deferred_t_state
,
1923 cmd
->transport_error_status
);
1924 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1925 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1926 " t_transport_active: %d t_transport_stop: %d"
1927 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1928 atomic_read(&cmd
->t_task_cdbs_left
),
1929 atomic_read(&cmd
->t_task_cdbs_sent
),
1930 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1931 atomic_read(&cmd
->t_transport_active
),
1932 atomic_read(&cmd
->t_transport_stop
),
1933 atomic_read(&cmd
->t_transport_sent
));
1935 transport_stop_all_task_timers(cmd
);
1938 atomic_inc(&dev
->depth_left
);
1940 * For SAM Task Attribute emulation for failed struct se_cmd
1942 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1943 transport_complete_task_attr(cmd
);
1946 transport_direct_request_timeout(cmd
);
1947 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1950 switch (cmd
->transport_error_status
) {
1951 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1952 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1954 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1955 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1957 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1958 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1960 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1961 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1963 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1965 transport_new_cmd_failure(cmd
);
1967 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1968 * we force this session to fall back to session
1971 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
1972 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
1975 case PYX_TRANSPORT_LU_COMM_FAILURE
:
1976 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
1977 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1979 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
1980 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
1982 case PYX_TRANSPORT_WRITE_PROTECTED
:
1983 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
1985 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
1987 * No SENSE Data payload for this case, set SCSI Status
1988 * and queue the response to $FABRIC_MOD.
1990 * Uses linux/include/scsi/scsi.h SAM status codes defs
1992 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1994 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1995 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1998 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2001 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2002 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2003 cmd
->orig_fe_lun
, 0x2C,
2004 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2006 ret
= cmd
->se_tfo
->queue_status(cmd
);
2010 case PYX_TRANSPORT_USE_SENSE_REASON
:
2012 * struct se_cmd->scsi_sense_reason already set
2016 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
2018 cmd
->transport_error_status
);
2019 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
2023 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2024 * make the call to transport_send_check_condition_and_sense()
2025 * directly. Otherwise expect the fabric to make the call to
2026 * transport_send_check_condition_and_sense() after handling
2027 * possible unsoliticied write data payloads.
2029 if (!sc
&& !cmd
->se_tfo
->new_cmd_map
)
2030 transport_new_cmd_failure(cmd
);
2032 ret
= transport_send_check_condition_and_sense(cmd
,
2033 cmd
->scsi_sense_reason
, 0);
2039 transport_lun_remove_cmd(cmd
);
2040 if (!transport_cmd_check_stop_to_fabric(cmd
))
2045 cmd
->t_state
= TRANSPORT_COMPLETE_OK
;
2046 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
2049 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
2051 unsigned long flags
;
2053 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2054 if (!atomic_read(&cmd
->t_transport_timeout
)) {
2055 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2058 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
2059 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2063 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
2065 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2068 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
2070 unsigned long flags
;
2073 * Reset cmd->t_se_count to allow transport_put_cmd()
2074 * to allow last call to free memory resources.
2076 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2077 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
2078 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
2080 atomic_sub(tmp
, &cmd
->t_se_count
);
2082 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2084 transport_put_cmd(cmd
);
2087 static inline u32
transport_lba_21(unsigned char *cdb
)
2089 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2092 static inline u32
transport_lba_32(unsigned char *cdb
)
2094 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2097 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2099 unsigned int __v1
, __v2
;
2101 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2102 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2104 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2108 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2110 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2112 unsigned int __v1
, __v2
;
2114 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2115 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2117 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2120 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2122 unsigned long flags
;
2124 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2125 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2126 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2130 * Called from interrupt context.
2132 static void transport_task_timeout_handler(unsigned long data
)
2134 struct se_task
*task
= (struct se_task
*)data
;
2135 struct se_cmd
*cmd
= task
->task_se_cmd
;
2136 unsigned long flags
;
2138 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2140 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2141 if (task
->task_flags
& TF_STOP
) {
2142 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2145 task
->task_flags
&= ~TF_RUNNING
;
2148 * Determine if transport_complete_task() has already been called.
2150 if (!atomic_read(&task
->task_active
)) {
2151 pr_debug("transport task: %p cmd: %p timeout task_active"
2152 " == 0\n", task
, cmd
);
2153 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2157 atomic_inc(&cmd
->t_se_count
);
2158 atomic_inc(&cmd
->t_transport_timeout
);
2159 cmd
->t_tasks_failed
= 1;
2161 atomic_set(&task
->task_timeout
, 1);
2162 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2163 task
->task_scsi_status
= 1;
2165 if (atomic_read(&task
->task_stop
)) {
2166 pr_debug("transport task: %p cmd: %p timeout task_stop"
2167 " == 1\n", task
, cmd
);
2168 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2169 complete(&task
->task_stop_comp
);
2173 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2174 pr_debug("transport task: %p cmd: %p timeout non zero"
2175 " t_task_cdbs_left\n", task
, cmd
);
2176 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2179 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2182 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2183 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2185 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
);
2189 * Called with cmd->t_state_lock held.
2191 static void transport_start_task_timer(struct se_task
*task
)
2193 struct se_device
*dev
= task
->se_dev
;
2196 if (task
->task_flags
& TF_RUNNING
)
2199 * If the task_timeout is disabled, exit now.
2201 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2205 init_timer(&task
->task_timer
);
2206 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2207 task
->task_timer
.data
= (unsigned long) task
;
2208 task
->task_timer
.function
= transport_task_timeout_handler
;
2210 task
->task_flags
|= TF_RUNNING
;
2211 add_timer(&task
->task_timer
);
2213 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2214 " %d\n", task
->task_se_cmd
, task
, timeout
);
2219 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2221 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2223 struct se_cmd
*cmd
= task
->task_se_cmd
;
2225 if (!task
->task_flags
& TF_RUNNING
)
2228 task
->task_flags
|= TF_STOP
;
2229 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
2231 del_timer_sync(&task
->task_timer
);
2233 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
2234 task
->task_flags
&= ~TF_RUNNING
;
2235 task
->task_flags
&= ~TF_STOP
;
2238 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2240 struct se_task
*task
= NULL
, *task_tmp
;
2241 unsigned long flags
;
2243 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2244 list_for_each_entry_safe(task
, task_tmp
,
2245 &cmd
->t_task_list
, t_list
)
2246 __transport_stop_task_timer(task
, &flags
);
2247 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2250 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2252 if (dev
->dev_tcq_window_closed
++ <
2253 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2254 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2256 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2258 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2263 * Called from Fabric Module context from transport_execute_tasks()
2265 * The return of this function determins if the tasks from struct se_cmd
2266 * get added to the execution queue in transport_execute_tasks(),
2267 * or are added to the delayed or ordered lists here.
2269 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2271 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2274 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2275 * to allow the passed struct se_cmd list of tasks to the front of the list.
2277 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2278 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2279 smp_mb__after_atomic_inc();
2280 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2281 " 0x%02x, se_ordered_id: %u\n",
2283 cmd
->se_ordered_id
);
2285 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2286 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2287 list_add_tail(&cmd
->se_ordered_node
,
2288 &cmd
->se_dev
->ordered_cmd_list
);
2289 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2291 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2292 smp_mb__after_atomic_inc();
2294 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2295 " list, se_ordered_id: %u\n",
2297 cmd
->se_ordered_id
);
2299 * Add ORDERED command to tail of execution queue if
2300 * no other older commands exist that need to be
2303 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2307 * For SIMPLE and UNTAGGED Task Attribute commands
2309 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2310 smp_mb__after_atomic_inc();
2313 * Otherwise if one or more outstanding ORDERED task attribute exist,
2314 * add the dormant task(s) built for the passed struct se_cmd to the
2315 * execution queue and become in Active state for this struct se_device.
2317 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2319 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2320 * will be drained upon completion of HEAD_OF_QUEUE task.
2322 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2323 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2324 list_add_tail(&cmd
->se_delayed_node
,
2325 &cmd
->se_dev
->delayed_cmd_list
);
2326 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2328 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2329 " delayed CMD list, se_ordered_id: %u\n",
2330 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2331 cmd
->se_ordered_id
);
2333 * Return zero to let transport_execute_tasks() know
2334 * not to add the delayed tasks to the execution list.
2339 * Otherwise, no ORDERED task attributes exist..
2345 * Called from fabric module context in transport_generic_new_cmd() and
2346 * transport_generic_process_write()
2348 static int transport_execute_tasks(struct se_cmd
*cmd
)
2352 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2353 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2354 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2359 * Call transport_cmd_check_stop() to see if a fabric exception
2360 * has occurred that prevents execution.
2362 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2364 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2365 * attribute for the tasks of the received struct se_cmd CDB
2367 add_tasks
= transport_execute_task_attr(cmd
);
2371 * This calls transport_add_tasks_from_cmd() to handle
2372 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2373 * (if enabled) in __transport_add_task_to_execute_queue() and
2374 * transport_add_task_check_sam_attr().
2376 transport_add_tasks_from_cmd(cmd
);
2379 * Kick the execution queue for the cmd associated struct se_device
2383 __transport_execute_tasks(cmd
->se_dev
);
2388 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2389 * from struct se_device->execute_task_list and
2391 * Called from transport_processing_thread()
2393 static int __transport_execute_tasks(struct se_device
*dev
)
2396 struct se_cmd
*cmd
= NULL
;
2397 struct se_task
*task
= NULL
;
2398 unsigned long flags
;
2401 * Check if there is enough room in the device and HBA queue to send
2402 * struct se_tasks to the selected transport.
2405 if (!atomic_read(&dev
->depth_left
))
2406 return transport_tcq_window_closed(dev
);
2408 dev
->dev_tcq_window_closed
= 0;
2410 spin_lock_irq(&dev
->execute_task_lock
);
2411 if (list_empty(&dev
->execute_task_list
)) {
2412 spin_unlock_irq(&dev
->execute_task_lock
);
2415 task
= list_first_entry(&dev
->execute_task_list
,
2416 struct se_task
, t_execute_list
);
2417 list_del(&task
->t_execute_list
);
2418 atomic_set(&task
->task_execute_queue
, 0);
2419 atomic_dec(&dev
->execute_tasks
);
2420 spin_unlock_irq(&dev
->execute_task_lock
);
2422 atomic_dec(&dev
->depth_left
);
2424 cmd
= task
->task_se_cmd
;
2426 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2427 atomic_set(&task
->task_active
, 1);
2428 atomic_set(&task
->task_sent
, 1);
2429 atomic_inc(&cmd
->t_task_cdbs_sent
);
2431 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2432 cmd
->t_task_list_num
)
2433 atomic_set(&cmd
->transport_sent
, 1);
2435 transport_start_task_timer(task
);
2436 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2438 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2439 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2440 * struct se_subsystem_api->do_task() caller below.
2442 if (cmd
->transport_emulate_cdb
) {
2443 error
= cmd
->transport_emulate_cdb(cmd
);
2445 cmd
->transport_error_status
= error
;
2446 atomic_set(&task
->task_active
, 0);
2447 atomic_set(&cmd
->transport_sent
, 0);
2448 transport_stop_tasks_for_cmd(cmd
);
2449 transport_generic_request_failure(cmd
, dev
, 0, 1);
2453 * Handle the successful completion for transport_emulate_cdb()
2454 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2455 * Otherwise the caller is expected to complete the task with
2458 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2459 cmd
->scsi_status
= SAM_STAT_GOOD
;
2460 task
->task_scsi_status
= GOOD
;
2461 transport_complete_task(task
, 1);
2465 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2466 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2467 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2468 * LUN emulation code.
2470 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2471 * call ->do_task() directly and let the underlying TCM subsystem plugin
2472 * code handle the CDB emulation.
2474 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2475 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2476 error
= transport_emulate_control_cdb(task
);
2478 error
= dev
->transport
->do_task(task
);
2481 cmd
->transport_error_status
= error
;
2482 atomic_set(&task
->task_active
, 0);
2483 atomic_set(&cmd
->transport_sent
, 0);
2484 transport_stop_tasks_for_cmd(cmd
);
2485 transport_generic_request_failure(cmd
, dev
, 0, 1);
2494 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2496 unsigned long flags
;
2498 * Any unsolicited data will get dumped for failed command inside of
2501 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2502 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2503 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2504 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2507 static void transport_nop_wait_for_tasks(struct se_cmd
*, int, int);
2509 static inline u32
transport_get_sectors_6(
2514 struct se_device
*dev
= cmd
->se_dev
;
2517 * Assume TYPE_DISK for non struct se_device objects.
2518 * Use 8-bit sector value.
2524 * Use 24-bit allocation length for TYPE_TAPE.
2526 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2527 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2530 * Everything else assume TYPE_DISK Sector CDB location.
2531 * Use 8-bit sector value.
2537 static inline u32
transport_get_sectors_10(
2542 struct se_device
*dev
= cmd
->se_dev
;
2545 * Assume TYPE_DISK for non struct se_device objects.
2546 * Use 16-bit sector value.
2552 * XXX_10 is not defined in SSC, throw an exception
2554 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2560 * Everything else assume TYPE_DISK Sector CDB location.
2561 * Use 16-bit sector value.
2564 return (u32
)(cdb
[7] << 8) + cdb
[8];
2567 static inline u32
transport_get_sectors_12(
2572 struct se_device
*dev
= cmd
->se_dev
;
2575 * Assume TYPE_DISK for non struct se_device objects.
2576 * Use 32-bit sector value.
2582 * XXX_12 is not defined in SSC, throw an exception
2584 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2590 * Everything else assume TYPE_DISK Sector CDB location.
2591 * Use 32-bit sector value.
2594 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2597 static inline u32
transport_get_sectors_16(
2602 struct se_device
*dev
= cmd
->se_dev
;
2605 * Assume TYPE_DISK for non struct se_device objects.
2606 * Use 32-bit sector value.
2612 * Use 24-bit allocation length for TYPE_TAPE.
2614 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2615 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2618 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2619 (cdb
[12] << 8) + cdb
[13];
2623 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2625 static inline u32
transport_get_sectors_32(
2631 * Assume TYPE_DISK for non struct se_device objects.
2632 * Use 32-bit sector value.
2634 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2635 (cdb
[30] << 8) + cdb
[31];
2639 static inline u32
transport_get_size(
2644 struct se_device
*dev
= cmd
->se_dev
;
2646 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2647 if (cdb
[1] & 1) { /* sectors */
2648 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2653 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2654 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2655 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2656 dev
->transport
->name
);
2658 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2661 static void transport_xor_callback(struct se_cmd
*cmd
)
2663 unsigned char *buf
, *addr
;
2664 struct scatterlist
*sg
;
2665 unsigned int offset
;
2669 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2671 * 1) read the specified logical block(s);
2672 * 2) transfer logical blocks from the data-out buffer;
2673 * 3) XOR the logical blocks transferred from the data-out buffer with
2674 * the logical blocks read, storing the resulting XOR data in a buffer;
2675 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2676 * blocks transferred from the data-out buffer; and
2677 * 5) transfer the resulting XOR data to the data-in buffer.
2679 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2681 pr_err("Unable to allocate xor_callback buf\n");
2685 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2686 * into the locally allocated *buf
2688 sg_copy_to_buffer(cmd
->t_data_sg
,
2694 * Now perform the XOR against the BIDI read memory located at
2695 * cmd->t_mem_bidi_list
2699 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2700 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2704 for (i
= 0; i
< sg
->length
; i
++)
2705 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2707 offset
+= sg
->length
;
2708 kunmap_atomic(addr
, KM_USER0
);
2716 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2718 static int transport_get_sense_data(struct se_cmd
*cmd
)
2720 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2721 struct se_device
*dev
;
2722 struct se_task
*task
= NULL
, *task_tmp
;
2723 unsigned long flags
;
2726 WARN_ON(!cmd
->se_lun
);
2728 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2729 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2730 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2734 list_for_each_entry_safe(task
, task_tmp
,
2735 &cmd
->t_task_list
, t_list
) {
2737 if (!task
->task_sense
)
2744 if (!dev
->transport
->get_sense_buffer
) {
2745 pr_err("dev->transport->get_sense_buffer"
2750 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2751 if (!sense_buffer
) {
2752 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
2753 " sense buffer for task with sense\n",
2754 cmd
->se_tfo
->get_task_tag(cmd
), task
->task_no
);
2757 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2759 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2760 TRANSPORT_SENSE_BUFFER
);
2762 memcpy(&buffer
[offset
], sense_buffer
,
2763 TRANSPORT_SENSE_BUFFER
);
2764 cmd
->scsi_status
= task
->task_scsi_status
;
2765 /* Automatically padded */
2766 cmd
->scsi_sense_length
=
2767 (TRANSPORT_SENSE_BUFFER
+ offset
);
2769 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2771 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2775 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2781 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2783 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
2784 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2785 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2786 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2788 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2789 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2792 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2795 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2796 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2797 cmd
->orig_fe_lun
, 0x2C,
2798 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2802 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2804 return dev
->transport
->get_blocks(dev
) + 1;
2807 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2809 struct se_device
*dev
= cmd
->se_dev
;
2812 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2815 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2817 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2818 pr_err("LBA: %llu Sectors: %u exceeds"
2819 " transport_dev_end_lba(): %llu\n",
2820 cmd
->t_task_lba
, sectors
,
2821 transport_dev_end_lba(dev
));
2828 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2831 * Determine if the received WRITE_SAME is used to for direct
2832 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2833 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2834 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2836 int passthrough
= (dev
->transport
->transport_type
==
2837 TRANSPORT_PLUGIN_PHBA_PDEV
);
2840 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2841 pr_err("WRITE_SAME PBDATA and LBDATA"
2842 " bits not supported for Block Discard"
2847 * Currently for the emulated case we only accept
2848 * tpws with the UNMAP=1 bit set.
2850 if (!(flags
[0] & 0x08)) {
2851 pr_err("WRITE_SAME w/o UNMAP bit not"
2852 " supported for Block Discard Emulation\n");
2860 /* transport_generic_cmd_sequencer():
2862 * Generic Command Sequencer that should work for most DAS transport
2865 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2868 * FIXME: Need to support other SCSI OPCODES where as well.
2870 static int transport_generic_cmd_sequencer(
2874 struct se_device
*dev
= cmd
->se_dev
;
2875 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2876 int ret
= 0, sector_ret
= 0, passthrough
;
2877 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2881 * Check for an existing UNIT ATTENTION condition
2883 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2884 cmd
->transport_wait_for_tasks
=
2885 &transport_nop_wait_for_tasks
;
2886 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2887 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2891 * Check status of Asymmetric Logical Unit Assignment port
2893 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2895 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
2897 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2898 * The ALUA additional sense code qualifier (ASCQ) is determined
2899 * by the ALUA primary or secondary access state..
2903 pr_debug("[%s]: ALUA TG Port not available,"
2904 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2905 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2907 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2908 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2909 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2912 goto out_invalid_cdb_field
;
2915 * Check status for SPC-3 Persistent Reservations
2917 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2918 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2919 cmd
, cdb
, pr_reg_type
) != 0)
2920 return transport_handle_reservation_conflict(cmd
);
2922 * This means the CDB is allowed for the SCSI Initiator port
2923 * when said port is *NOT* holding the legacy SPC-2 or
2924 * SPC-3 Persistent Reservation.
2930 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2932 goto out_unsupported_cdb
;
2933 size
= transport_get_size(sectors
, cdb
, cmd
);
2934 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2935 cmd
->t_task_lba
= transport_lba_21(cdb
);
2936 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2939 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2941 goto out_unsupported_cdb
;
2942 size
= transport_get_size(sectors
, cdb
, cmd
);
2943 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2944 cmd
->t_task_lba
= transport_lba_32(cdb
);
2945 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2948 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2950 goto out_unsupported_cdb
;
2951 size
= transport_get_size(sectors
, cdb
, cmd
);
2952 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2953 cmd
->t_task_lba
= transport_lba_32(cdb
);
2954 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2957 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2959 goto out_unsupported_cdb
;
2960 size
= transport_get_size(sectors
, cdb
, cmd
);
2961 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
2962 cmd
->t_task_lba
= transport_lba_64(cdb
);
2963 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2966 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2968 goto out_unsupported_cdb
;
2969 size
= transport_get_size(sectors
, cdb
, cmd
);
2970 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2971 cmd
->t_task_lba
= transport_lba_21(cdb
);
2972 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2975 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2977 goto out_unsupported_cdb
;
2978 size
= transport_get_size(sectors
, cdb
, cmd
);
2979 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2980 cmd
->t_task_lba
= transport_lba_32(cdb
);
2981 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2982 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2985 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2987 goto out_unsupported_cdb
;
2988 size
= transport_get_size(sectors
, cdb
, cmd
);
2989 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2990 cmd
->t_task_lba
= transport_lba_32(cdb
);
2991 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2992 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2995 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2997 goto out_unsupported_cdb
;
2998 size
= transport_get_size(sectors
, cdb
, cmd
);
2999 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
3000 cmd
->t_task_lba
= transport_lba_64(cdb
);
3001 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
3002 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3004 case XDWRITEREAD_10
:
3005 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
3006 !(cmd
->t_tasks_bidi
))
3007 goto out_invalid_cdb_field
;
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
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3015 passthrough
= (dev
->transport
->transport_type
==
3016 TRANSPORT_PLUGIN_PHBA_PDEV
);
3018 * Skip the remaining assignments for TCM/PSCSI passthrough
3023 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3025 cmd
->transport_complete_callback
= &transport_xor_callback
;
3026 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
3028 case VARIABLE_LENGTH_CMD
:
3029 service_action
= get_unaligned_be16(&cdb
[8]);
3031 * Determine if this is TCM/PSCSI device and we should disable
3032 * internal emulation for this CDB.
3034 passthrough
= (dev
->transport
->transport_type
==
3035 TRANSPORT_PLUGIN_PHBA_PDEV
);
3037 switch (service_action
) {
3038 case XDWRITEREAD_32
:
3039 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3041 goto out_unsupported_cdb
;
3042 size
= transport_get_size(sectors
, cdb
, cmd
);
3044 * Use WRITE_32 and READ_32 opcodes for the emulated
3045 * XDWRITE_READ_32 logic.
3047 cmd
->transport_split_cdb
= &split_cdb_XX_32
;
3048 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
3049 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3052 * Skip the remaining assignments for TCM/PSCSI passthrough
3058 * Setup BIDI XOR callback to be run during
3059 * transport_generic_complete_ok()
3061 cmd
->transport_complete_callback
= &transport_xor_callback
;
3062 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
3065 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3067 goto out_unsupported_cdb
;
3070 size
= transport_get_size(1, cdb
, cmd
);
3072 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3074 goto out_invalid_cdb_field
;
3077 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
3078 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3080 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
3081 goto out_invalid_cdb_field
;
3085 pr_err("VARIABLE_LENGTH_CMD service action"
3086 " 0x%04x not supported\n", service_action
);
3087 goto out_unsupported_cdb
;
3090 case MAINTENANCE_IN
:
3091 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3092 /* MAINTENANCE_IN from SCC-2 */
3094 * Check for emulated MI_REPORT_TARGET_PGS.
3096 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
3097 cmd
->transport_emulate_cdb
=
3098 (su_dev
->t10_alua
.alua_type
==
3099 SPC3_ALUA_EMULATED
) ?
3100 core_emulate_report_target_port_groups
:
3103 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3104 (cdb
[8] << 8) | cdb
[9];
3106 /* GPCMD_SEND_KEY from multi media commands */
3107 size
= (cdb
[8] << 8) + cdb
[9];
3109 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3113 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3115 case MODE_SELECT_10
:
3116 size
= (cdb
[7] << 8) + cdb
[8];
3117 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3121 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3124 case GPCMD_READ_BUFFER_CAPACITY
:
3125 case GPCMD_SEND_OPC
:
3128 size
= (cdb
[7] << 8) + cdb
[8];
3129 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3131 case READ_BLOCK_LIMITS
:
3132 size
= READ_BLOCK_LEN
;
3133 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3135 case GPCMD_GET_CONFIGURATION
:
3136 case GPCMD_READ_FORMAT_CAPACITIES
:
3137 case GPCMD_READ_DISC_INFO
:
3138 case GPCMD_READ_TRACK_RZONE_INFO
:
3139 size
= (cdb
[7] << 8) + cdb
[8];
3140 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3142 case PERSISTENT_RESERVE_IN
:
3143 case PERSISTENT_RESERVE_OUT
:
3144 cmd
->transport_emulate_cdb
=
3145 (su_dev
->t10_pr
.res_type
==
3146 SPC3_PERSISTENT_RESERVATIONS
) ?
3147 core_scsi3_emulate_pr
: NULL
;
3148 size
= (cdb
[7] << 8) + cdb
[8];
3149 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3151 case GPCMD_MECHANISM_STATUS
:
3152 case GPCMD_READ_DVD_STRUCTURE
:
3153 size
= (cdb
[8] << 8) + cdb
[9];
3154 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3157 size
= READ_POSITION_LEN
;
3158 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3160 case MAINTENANCE_OUT
:
3161 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3162 /* MAINTENANCE_OUT from SCC-2
3164 * Check for emulated MO_SET_TARGET_PGS.
3166 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3167 cmd
->transport_emulate_cdb
=
3168 (su_dev
->t10_alua
.alua_type
==
3169 SPC3_ALUA_EMULATED
) ?
3170 core_emulate_set_target_port_groups
:
3174 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3175 (cdb
[8] << 8) | cdb
[9];
3177 /* GPCMD_REPORT_KEY from multi media commands */
3178 size
= (cdb
[8] << 8) + cdb
[9];
3180 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3183 size
= (cdb
[3] << 8) + cdb
[4];
3185 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3186 * See spc4r17 section 5.3
3188 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3189 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3190 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3193 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3194 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3197 size
= READ_CAP_LEN
;
3198 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3200 case READ_MEDIA_SERIAL_NUMBER
:
3201 case SECURITY_PROTOCOL_IN
:
3202 case SECURITY_PROTOCOL_OUT
:
3203 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3204 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3206 case SERVICE_ACTION_IN
:
3207 case ACCESS_CONTROL_IN
:
3208 case ACCESS_CONTROL_OUT
:
3210 case READ_ATTRIBUTE
:
3211 case RECEIVE_COPY_RESULTS
:
3212 case WRITE_ATTRIBUTE
:
3213 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3214 (cdb
[12] << 8) | cdb
[13];
3215 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3217 case RECEIVE_DIAGNOSTIC
:
3218 case SEND_DIAGNOSTIC
:
3219 size
= (cdb
[3] << 8) | cdb
[4];
3220 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3222 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3225 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3226 size
= (2336 * sectors
);
3227 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3232 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3236 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3238 case READ_ELEMENT_STATUS
:
3239 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3240 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3243 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3244 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3249 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3250 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3252 if (cdb
[0] == RESERVE_10
)
3253 size
= (cdb
[7] << 8) | cdb
[8];
3255 size
= cmd
->data_length
;
3258 * Setup the legacy emulated handler for SPC-2 and
3259 * >= SPC-3 compatible reservation handling (CRH=1)
3260 * Otherwise, we assume the underlying SCSI logic is
3261 * is running in SPC_PASSTHROUGH, and wants reservations
3262 * emulation disabled.
3264 cmd
->transport_emulate_cdb
=
3265 (su_dev
->t10_pr
.res_type
!=
3267 core_scsi2_emulate_crh
: NULL
;
3268 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3273 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3274 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3276 if (cdb
[0] == RELEASE_10
)
3277 size
= (cdb
[7] << 8) | cdb
[8];
3279 size
= cmd
->data_length
;
3281 cmd
->transport_emulate_cdb
=
3282 (su_dev
->t10_pr
.res_type
!=
3284 core_scsi2_emulate_crh
: NULL
;
3285 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3287 case SYNCHRONIZE_CACHE
:
3288 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3290 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3292 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3293 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3294 cmd
->t_task_lba
= transport_lba_32(cdb
);
3296 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3297 cmd
->t_task_lba
= transport_lba_64(cdb
);
3300 goto out_unsupported_cdb
;
3302 size
= transport_get_size(sectors
, cdb
, cmd
);
3303 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3306 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3308 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3311 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3312 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3314 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3316 * Check to ensure that LBA + Range does not exceed past end of
3317 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3319 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3320 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3321 goto out_invalid_cdb_field
;
3325 size
= get_unaligned_be16(&cdb
[7]);
3326 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3329 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3331 goto out_unsupported_cdb
;
3334 size
= transport_get_size(1, cdb
, cmd
);
3336 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3337 goto out_invalid_cdb_field
;
3340 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3341 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3343 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3344 goto out_invalid_cdb_field
;
3347 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3349 goto out_unsupported_cdb
;
3352 size
= transport_get_size(1, cdb
, cmd
);
3354 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3355 goto out_invalid_cdb_field
;
3358 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3359 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3361 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3362 * of byte 1 bit 3 UNMAP instead of original reserved field
3364 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3365 goto out_invalid_cdb_field
;
3367 case ALLOW_MEDIUM_REMOVAL
:
3368 case GPCMD_CLOSE_TRACK
:
3370 case INITIALIZE_ELEMENT_STATUS
:
3371 case GPCMD_LOAD_UNLOAD
:
3374 case GPCMD_SET_SPEED
:
3377 case TEST_UNIT_READY
:
3379 case WRITE_FILEMARKS
:
3381 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3384 cmd
->transport_emulate_cdb
=
3385 transport_core_report_lun_response
;
3386 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3388 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3389 * See spc4r17 section 5.3
3391 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3392 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3393 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3396 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3397 " 0x%02x, sending CHECK_CONDITION.\n",
3398 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3399 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3400 goto out_unsupported_cdb
;
3403 if (size
!= cmd
->data_length
) {
3404 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3405 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3406 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3407 cmd
->data_length
, size
, cdb
[0]);
3409 cmd
->cmd_spdtl
= size
;
3411 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3412 pr_err("Rejecting underflow/overflow"
3414 goto out_invalid_cdb_field
;
3417 * Reject READ_* or WRITE_* with overflow/underflow for
3418 * type SCF_SCSI_DATA_SG_IO_CDB.
3420 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3421 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3422 " CDB on non 512-byte sector setup subsystem"
3423 " plugin: %s\n", dev
->transport
->name
);
3424 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3425 goto out_invalid_cdb_field
;
3428 if (size
> cmd
->data_length
) {
3429 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3430 cmd
->residual_count
= (size
- cmd
->data_length
);
3432 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3433 cmd
->residual_count
= (cmd
->data_length
- size
);
3435 cmd
->data_length
= size
;
3438 /* Let's limit control cdbs to a page, for simplicity's sake. */
3439 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3441 goto out_invalid_cdb_field
;
3443 transport_set_supported_SAM_opcode(cmd
);
3446 out_unsupported_cdb
:
3447 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3448 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3450 out_invalid_cdb_field
:
3451 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3452 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3457 * Called from transport_generic_complete_ok() and
3458 * transport_generic_request_failure() to determine which dormant/delayed
3459 * and ordered cmds need to have their tasks added to the execution queue.
3461 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3463 struct se_device
*dev
= cmd
->se_dev
;
3464 struct se_cmd
*cmd_p
, *cmd_tmp
;
3465 int new_active_tasks
= 0;
3467 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3468 atomic_dec(&dev
->simple_cmds
);
3469 smp_mb__after_atomic_dec();
3470 dev
->dev_cur_ordered_id
++;
3471 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3472 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3473 cmd
->se_ordered_id
);
3474 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3475 atomic_dec(&dev
->dev_hoq_count
);
3476 smp_mb__after_atomic_dec();
3477 dev
->dev_cur_ordered_id
++;
3478 pr_debug("Incremented dev_cur_ordered_id: %u for"
3479 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3480 cmd
->se_ordered_id
);
3481 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3482 spin_lock(&dev
->ordered_cmd_lock
);
3483 list_del(&cmd
->se_ordered_node
);
3484 atomic_dec(&dev
->dev_ordered_sync
);
3485 smp_mb__after_atomic_dec();
3486 spin_unlock(&dev
->ordered_cmd_lock
);
3488 dev
->dev_cur_ordered_id
++;
3489 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3490 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3493 * Process all commands up to the last received
3494 * ORDERED task attribute which requires another blocking
3497 spin_lock(&dev
->delayed_cmd_lock
);
3498 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3499 &dev
->delayed_cmd_list
, se_delayed_node
) {
3501 list_del(&cmd_p
->se_delayed_node
);
3502 spin_unlock(&dev
->delayed_cmd_lock
);
3504 pr_debug("Calling add_tasks() for"
3505 " cmd_p: 0x%02x Task Attr: 0x%02x"
3506 " Dormant -> Active, se_ordered_id: %u\n",
3507 cmd_p
->t_task_cdb
[0],
3508 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3510 transport_add_tasks_from_cmd(cmd_p
);
3513 spin_lock(&dev
->delayed_cmd_lock
);
3514 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3517 spin_unlock(&dev
->delayed_cmd_lock
);
3519 * If new tasks have become active, wake up the transport thread
3520 * to do the processing of the Active tasks.
3522 if (new_active_tasks
!= 0)
3523 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3526 static int transport_complete_qf(struct se_cmd
*cmd
)
3530 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
3531 return cmd
->se_tfo
->queue_status(cmd
);
3533 switch (cmd
->data_direction
) {
3534 case DMA_FROM_DEVICE
:
3535 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3538 if (cmd
->t_bidi_data_sg
) {
3539 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3543 /* Fall through for DMA_TO_DEVICE */
3545 ret
= cmd
->se_tfo
->queue_status(cmd
);
3554 static void transport_handle_queue_full(
3556 struct se_device
*dev
,
3557 int (*qf_callback
)(struct se_cmd
*))
3559 spin_lock_irq(&dev
->qf_cmd_lock
);
3560 cmd
->se_cmd_flags
|= SCF_EMULATE_QUEUE_FULL
;
3561 cmd
->transport_qf_callback
= qf_callback
;
3562 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3563 atomic_inc(&dev
->dev_qf_count
);
3564 smp_mb__after_atomic_inc();
3565 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3567 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3570 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3572 int reason
= 0, ret
;
3574 * Check if we need to move delayed/dormant tasks from cmds on the
3575 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3578 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3579 transport_complete_task_attr(cmd
);
3581 * Check to schedule QUEUE_FULL work, or execute an existing
3582 * cmd->transport_qf_callback()
3584 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3585 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3587 if (cmd
->transport_qf_callback
) {
3588 ret
= cmd
->transport_qf_callback(cmd
);
3592 cmd
->transport_qf_callback
= NULL
;
3596 * Check if we need to retrieve a sense buffer from
3597 * the struct se_cmd in question.
3599 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3600 if (transport_get_sense_data(cmd
) < 0)
3601 reason
= TCM_NON_EXISTENT_LUN
;
3604 * Only set when an struct se_task->task_scsi_status returned
3605 * a non GOOD status.
3607 if (cmd
->scsi_status
) {
3608 ret
= transport_send_check_condition_and_sense(
3613 transport_lun_remove_cmd(cmd
);
3614 transport_cmd_check_stop_to_fabric(cmd
);
3619 * Check for a callback, used by amongst other things
3620 * XDWRITE_READ_10 emulation.
3622 if (cmd
->transport_complete_callback
)
3623 cmd
->transport_complete_callback(cmd
);
3625 switch (cmd
->data_direction
) {
3626 case DMA_FROM_DEVICE
:
3627 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3628 if (cmd
->se_lun
->lun_sep
) {
3629 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3632 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3634 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3639 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3640 if (cmd
->se_lun
->lun_sep
) {
3641 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3644 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3646 * Check if we need to send READ payload for BIDI-COMMAND
3648 if (cmd
->t_bidi_data_sg
) {
3649 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3650 if (cmd
->se_lun
->lun_sep
) {
3651 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3654 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3655 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3660 /* Fall through for DMA_TO_DEVICE */
3662 ret
= cmd
->se_tfo
->queue_status(cmd
);
3671 transport_lun_remove_cmd(cmd
);
3672 transport_cmd_check_stop_to_fabric(cmd
);
3676 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3677 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3678 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
3681 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3683 struct se_task
*task
, *task_tmp
;
3684 unsigned long flags
;
3686 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3687 list_for_each_entry_safe(task
, task_tmp
,
3688 &cmd
->t_task_list
, t_list
) {
3689 if (atomic_read(&task
->task_active
))
3692 kfree(task
->task_sg_bidi
);
3693 kfree(task
->task_sg
);
3695 list_del(&task
->t_list
);
3697 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3699 task
->se_dev
->transport
->free_task(task
);
3701 pr_err("task[%u] - task->se_dev is NULL\n",
3703 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3705 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3708 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3710 struct scatterlist
*sg
;
3713 for_each_sg(sgl
, sg
, nents
, count
)
3714 __free_page(sg_page(sg
));
3719 static inline void transport_free_pages(struct se_cmd
*cmd
)
3721 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3724 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3725 cmd
->t_data_sg
= NULL
;
3726 cmd
->t_data_nents
= 0;
3728 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3729 cmd
->t_bidi_data_sg
= NULL
;
3730 cmd
->t_bidi_data_nents
= 0;
3734 * transport_put_cmd - release a reference to a command
3735 * @cmd: command to release
3737 * This routine releases our reference to the command and frees it if possible.
3739 static bool transport_put_cmd(struct se_cmd
*cmd
)
3741 unsigned long flags
;
3744 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3745 if (atomic_read(&cmd
->t_fe_count
)) {
3746 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3750 if (atomic_read(&cmd
->t_se_count
)) {
3751 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3755 if (atomic_read(&cmd
->transport_dev_active
)) {
3756 atomic_set(&cmd
->transport_dev_active
, 0);
3757 transport_all_task_dev_remove_state(cmd
);
3760 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3762 if (free_tasks
!= 0)
3763 transport_free_dev_tasks(cmd
);
3765 transport_free_pages(cmd
);
3766 transport_release_cmd(cmd
);
3769 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3774 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3775 * allocating in the core.
3776 * @cmd: Associated se_cmd descriptor
3777 * @mem: SGL style memory for TCM WRITE / READ
3778 * @sg_mem_num: Number of SGL elements
3779 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3780 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3782 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3785 int transport_generic_map_mem_to_cmd(
3787 struct scatterlist
*sgl
,
3789 struct scatterlist
*sgl_bidi
,
3792 if (!sgl
|| !sgl_count
)
3795 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3796 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3798 cmd
->t_data_sg
= sgl
;
3799 cmd
->t_data_nents
= sgl_count
;
3801 if (sgl_bidi
&& sgl_bidi_count
) {
3802 cmd
->t_bidi_data_sg
= sgl_bidi
;
3803 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3805 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3810 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3812 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
3814 struct se_device
*dev
= cmd
->se_dev
;
3815 int set_counts
= 1, rc
, task_cdbs
;
3818 * Setup any BIDI READ tasks and memory from
3819 * cmd->t_mem_bidi_list so the READ struct se_tasks
3820 * are queued first for the non pSCSI passthrough case.
3822 if (cmd
->t_bidi_data_sg
&&
3823 (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
3824 rc
= transport_allocate_tasks(cmd
,
3827 cmd
->t_bidi_data_sg
,
3828 cmd
->t_bidi_data_nents
);
3830 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3831 cmd
->scsi_sense_reason
=
3832 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3835 atomic_inc(&cmd
->t_fe_count
);
3836 atomic_inc(&cmd
->t_se_count
);
3840 * Setup the tasks and memory from cmd->t_mem_list
3841 * Note for BIDI transfers this will contain the WRITE payload
3843 task_cdbs
= transport_allocate_tasks(cmd
,
3845 cmd
->data_direction
,
3848 if (task_cdbs
<= 0) {
3849 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3850 cmd
->scsi_sense_reason
=
3851 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3856 atomic_inc(&cmd
->t_fe_count
);
3857 atomic_inc(&cmd
->t_se_count
);
3860 cmd
->t_task_list_num
= task_cdbs
;
3862 atomic_set(&cmd
->t_task_cdbs_left
, task_cdbs
);
3863 atomic_set(&cmd
->t_task_cdbs_ex_left
, task_cdbs
);
3864 atomic_set(&cmd
->t_task_cdbs_timeout_left
, task_cdbs
);
3868 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3870 struct scatterlist
*sg
= cmd
->t_data_sg
;
3874 * We need to take into account a possible offset here for fabrics like
3875 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3876 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3878 return kmap(sg_page(sg
)) + sg
->offset
;
3880 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3882 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3884 kunmap(sg_page(cmd
->t_data_sg
));
3886 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3889 transport_generic_get_mem(struct se_cmd
*cmd
)
3891 u32 length
= cmd
->data_length
;
3896 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3897 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3898 if (!cmd
->t_data_sg
)
3901 cmd
->t_data_nents
= nents
;
3902 sg_init_table(cmd
->t_data_sg
, nents
);
3905 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3906 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3910 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3918 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3921 kfree(cmd
->t_data_sg
);
3922 cmd
->t_data_sg
= NULL
;
3926 /* Reduce sectors if they are too long for the device */
3927 static inline sector_t
transport_limit_task_sectors(
3928 struct se_device
*dev
,
3929 unsigned long long lba
,
3932 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3934 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3935 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3936 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3943 * This function can be used by HW target mode drivers to create a linked
3944 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3945 * This is intended to be called during the completion path by TCM Core
3946 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3948 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3950 struct scatterlist
*sg_first
= NULL
;
3951 struct scatterlist
*sg_prev
= NULL
;
3952 int sg_prev_nents
= 0;
3953 struct scatterlist
*sg
;
3954 struct se_task
*task
;
3955 u32 chained_nents
= 0;
3958 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3961 * Walk the struct se_task list and setup scatterlist chains
3962 * for each contiguously allocated struct se_task->task_sg[].
3964 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3969 sg_first
= task
->task_sg
;
3970 chained_nents
= task
->task_sg_nents
;
3972 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3973 chained_nents
+= task
->task_sg_nents
;
3976 * For the padded tasks, use the extra SGL vector allocated
3977 * in transport_allocate_data_tasks() for the sg_prev_nents
3978 * offset into sg_chain() above.. The last task of a
3979 * multi-task list, or a single task will not have
3980 * task->task_sg_padded set..
3982 if (task
->task_padded_sg
)
3983 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3985 sg_prev_nents
= task
->task_sg_nents
;
3987 sg_prev
= task
->task_sg
;
3990 * Setup the starting pointer and total t_tasks_sg_linked_no including
3991 * padding SGs for linking and to mark the end.
3993 cmd
->t_tasks_sg_chained
= sg_first
;
3994 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3996 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3997 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3998 cmd
->t_tasks_sg_chained_no
);
4000 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
4001 cmd
->t_tasks_sg_chained_no
, i
) {
4003 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
4004 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
4005 if (sg_is_chain(sg
))
4006 pr_debug("SG: %p sg_is_chain=1\n", sg
);
4008 pr_debug("SG: %p sg_is_last=1\n", sg
);
4011 EXPORT_SYMBOL(transport_do_task_sg_chain
);
4014 * Break up cmd into chunks transport can handle
4016 static int transport_allocate_data_tasks(
4018 unsigned long long lba
,
4019 enum dma_data_direction data_direction
,
4020 struct scatterlist
*sgl
,
4021 unsigned int sgl_nents
)
4023 unsigned char *cdb
= NULL
;
4024 struct se_task
*task
;
4025 struct se_device
*dev
= cmd
->se_dev
;
4026 unsigned long flags
;
4027 int task_count
, i
, ret
;
4028 sector_t sectors
, dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
4029 u32 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
4030 struct scatterlist
*sg
;
4031 struct scatterlist
*cmd_sg
;
4033 WARN_ON(cmd
->data_length
% sector_size
);
4034 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
4035 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
4038 for (i
= 0; i
< task_count
; i
++) {
4039 unsigned int task_size
, task_sg_nents_padded
;
4042 task
= transport_generic_get_task(cmd
, data_direction
);
4046 task
->task_lba
= lba
;
4047 task
->task_sectors
= min(sectors
, dev_max_sectors
);
4048 task
->task_size
= task
->task_sectors
* sector_size
;
4050 cdb
= dev
->transport
->get_cdb(task
);
4053 memcpy(cdb
, cmd
->t_task_cdb
,
4054 scsi_command_size(cmd
->t_task_cdb
));
4056 /* Update new cdb with updated lba/sectors */
4057 cmd
->transport_split_cdb(task
->task_lba
, task
->task_sectors
, cdb
);
4059 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
4060 * in order to calculate the number per task SGL entries
4062 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
4064 * Check if the fabric module driver is requesting that all
4065 * struct se_task->task_sg[] be chained together.. If so,
4066 * then allocate an extra padding SG entry for linking and
4067 * marking the end of the chained SGL for every task except
4068 * the last one for (task_count > 1) operation, or skipping
4069 * the extra padding for the (task_count == 1) case.
4071 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
4072 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
4073 task
->task_padded_sg
= 1;
4075 task_sg_nents_padded
= task
->task_sg_nents
;
4077 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
4078 task_sg_nents_padded
, GFP_KERNEL
);
4079 if (!task
->task_sg
) {
4080 cmd
->se_dev
->transport
->free_task(task
);
4084 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
4086 task_size
= task
->task_size
;
4088 /* Build new sgl, only up to task_size */
4089 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
4090 if (cmd_sg
->length
> task_size
)
4094 task_size
-= cmd_sg
->length
;
4095 cmd_sg
= sg_next(cmd_sg
);
4098 lba
+= task
->task_sectors
;
4099 sectors
-= task
->task_sectors
;
4101 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4102 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4103 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4106 * Now perform the memory map of task->task_sg[] into backend
4107 * subsystem memory..
4109 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
4110 if (atomic_read(&task
->task_sent
))
4112 if (!dev
->transport
->map_data_SG
)
4115 ret
= dev
->transport
->map_data_SG(task
);
4124 transport_allocate_control_task(struct se_cmd
*cmd
)
4126 struct se_device
*dev
= cmd
->se_dev
;
4128 struct se_task
*task
;
4129 unsigned long flags
;
4132 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
4136 cdb
= dev
->transport
->get_cdb(task
);
4138 memcpy(cdb
, cmd
->t_task_cdb
,
4139 scsi_command_size(cmd
->t_task_cdb
));
4141 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
4143 if (!task
->task_sg
) {
4144 cmd
->se_dev
->transport
->free_task(task
);
4148 memcpy(task
->task_sg
, cmd
->t_data_sg
,
4149 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
4150 task
->task_size
= cmd
->data_length
;
4151 task
->task_sg_nents
= cmd
->t_data_nents
;
4153 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4154 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4155 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4157 if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) {
4158 if (dev
->transport
->map_control_SG
)
4159 ret
= dev
->transport
->map_control_SG(task
);
4160 } else if (cmd
->se_cmd_flags
& SCF_SCSI_NON_DATA_CDB
) {
4161 if (dev
->transport
->cdb_none
)
4162 ret
= dev
->transport
->cdb_none(task
);
4164 pr_err("target: Unknown control cmd type!\n");
4168 /* Success! Return number of tasks allocated */
4174 static u32
transport_allocate_tasks(
4176 unsigned long long lba
,
4177 enum dma_data_direction data_direction
,
4178 struct scatterlist
*sgl
,
4179 unsigned int sgl_nents
)
4181 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
4182 if (transport_cmd_get_valid_sectors(cmd
) < 0)
4185 return transport_allocate_data_tasks(cmd
, lba
, data_direction
,
4188 return transport_allocate_control_task(cmd
);
4193 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4195 * Allocate storage transport resources from a set of values predefined
4196 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4197 * Any non zero return here is treated as an "out of resource' op here.
4200 * Generate struct se_task(s) and/or their payloads for this CDB.
4202 int transport_generic_new_cmd(struct se_cmd
*cmd
)
4207 * Determine is the TCM fabric module has already allocated physical
4208 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4211 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
4213 ret
= transport_generic_get_mem(cmd
);
4218 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4219 * control or data CDB types, and perform the map to backend subsystem
4220 * code from SGL memory allocated here by transport_generic_get_mem(), or
4221 * via pre-existing SGL memory setup explictly by fabric module code with
4222 * transport_generic_map_mem_to_cmd().
4224 ret
= transport_new_cmd_obj(cmd
);
4228 * For WRITEs, let the fabric know its buffer is ready..
4229 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4230 * will be added to the struct se_device execution queue after its WRITE
4231 * data has arrived. (ie: It gets handled by the transport processing
4232 * thread a second time)
4234 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4235 transport_add_tasks_to_state_queue(cmd
);
4236 return transport_generic_write_pending(cmd
);
4239 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4240 * to the execution queue.
4242 transport_execute_tasks(cmd
);
4245 EXPORT_SYMBOL(transport_generic_new_cmd
);
4247 /* transport_generic_process_write():
4251 void transport_generic_process_write(struct se_cmd
*cmd
)
4253 transport_execute_tasks(cmd
);
4255 EXPORT_SYMBOL(transport_generic_process_write
);
4257 static int transport_write_pending_qf(struct se_cmd
*cmd
)
4259 return cmd
->se_tfo
->write_pending(cmd
);
4262 /* transport_generic_write_pending():
4266 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4268 unsigned long flags
;
4271 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4272 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4273 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4275 if (cmd
->transport_qf_callback
) {
4276 ret
= cmd
->transport_qf_callback(cmd
);
4282 cmd
->transport_qf_callback
= NULL
;
4287 * Clear the se_cmd for WRITE_PENDING status in order to set
4288 * cmd->t_transport_active=0 so that transport_generic_handle_data
4289 * can be called from HW target mode interrupt code. This is safe
4290 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4291 * because the se_cmd->se_lun pointer is not being cleared.
4293 transport_cmd_check_stop(cmd
, 1, 0);
4296 * Call the fabric write_pending function here to let the
4297 * frontend know that WRITE buffers are ready.
4299 ret
= cmd
->se_tfo
->write_pending(cmd
);
4305 return PYX_TRANSPORT_WRITE_PENDING
;
4308 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4309 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4310 transport_handle_queue_full(cmd
, cmd
->se_dev
,
4311 transport_write_pending_qf
);
4316 * transport_release_cmd - free a command
4317 * @cmd: command to free
4319 * This routine unconditionally frees a command, and reference counting
4320 * or list removal must be done in the caller.
4322 void transport_release_cmd(struct se_cmd
*cmd
)
4324 BUG_ON(!cmd
->se_tfo
);
4326 if (cmd
->se_tmr_req
)
4327 core_tmr_release_req(cmd
->se_tmr_req
);
4328 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
4329 kfree(cmd
->t_task_cdb
);
4330 cmd
->se_tfo
->release_cmd(cmd
);
4332 EXPORT_SYMBOL(transport_release_cmd
);
4334 /* transport_generic_free_cmd():
4336 * Called from processing frontend to release storage engine resources
4338 void transport_generic_free_cmd(
4341 int session_reinstatement
)
4343 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
))
4344 transport_release_cmd(cmd
);
4346 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4350 pr_debug("cmd: %p ITT: 0x%08x contains"
4351 " cmd->se_lun\n", cmd
,
4352 cmd
->se_tfo
->get_task_tag(cmd
));
4354 transport_lun_remove_cmd(cmd
);
4357 if (wait_for_tasks
&& cmd
->transport_wait_for_tasks
)
4358 cmd
->transport_wait_for_tasks(cmd
, 0, 0);
4360 transport_free_dev_tasks(cmd
);
4362 if (!transport_put_cmd(cmd
) && session_reinstatement
) {
4363 unsigned long flags
;
4365 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4366 transport_all_task_dev_remove_state(cmd
);
4367 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4371 EXPORT_SYMBOL(transport_generic_free_cmd
);
4373 static void transport_nop_wait_for_tasks(
4376 int session_reinstatement
)
4381 /* transport_lun_wait_for_tasks():
4383 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4384 * an struct se_lun to be successfully shutdown.
4386 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4388 unsigned long flags
;
4391 * If the frontend has already requested this struct se_cmd to
4392 * be stopped, we can safely ignore this struct se_cmd.
4394 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4395 if (atomic_read(&cmd
->t_transport_stop
)) {
4396 atomic_set(&cmd
->transport_lun_stop
, 0);
4397 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4398 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4399 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4400 transport_cmd_check_stop(cmd
, 1, 0);
4403 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4404 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4406 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4408 ret
= transport_stop_tasks_for_cmd(cmd
);
4410 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4411 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4413 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4414 cmd
->se_tfo
->get_task_tag(cmd
));
4415 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4416 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4417 cmd
->se_tfo
->get_task_tag(cmd
));
4419 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
4424 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4426 struct se_cmd
*cmd
= NULL
;
4427 unsigned long lun_flags
, cmd_flags
;
4429 * Do exception processing and return CHECK_CONDITION status to the
4432 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4433 while (!list_empty(&lun
->lun_cmd_list
)) {
4434 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4435 struct se_cmd
, se_lun_node
);
4436 list_del(&cmd
->se_lun_node
);
4438 atomic_set(&cmd
->transport_lun_active
, 0);
4440 * This will notify iscsi_target_transport.c:
4441 * transport_cmd_check_stop() that a LUN shutdown is in
4442 * progress for the iscsi_cmd_t.
4444 spin_lock(&cmd
->t_state_lock
);
4445 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4446 "_lun_stop for ITT: 0x%08x\n",
4447 cmd
->se_lun
->unpacked_lun
,
4448 cmd
->se_tfo
->get_task_tag(cmd
));
4449 atomic_set(&cmd
->transport_lun_stop
, 1);
4450 spin_unlock(&cmd
->t_state_lock
);
4452 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4455 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4456 cmd
->se_tfo
->get_task_tag(cmd
),
4457 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4461 * If the Storage engine still owns the iscsi_cmd_t, determine
4462 * and/or stop its context.
4464 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4465 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4466 cmd
->se_tfo
->get_task_tag(cmd
));
4468 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4469 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4473 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4474 "_wait_for_tasks(): SUCCESS\n",
4475 cmd
->se_lun
->unpacked_lun
,
4476 cmd
->se_tfo
->get_task_tag(cmd
));
4478 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4479 if (!atomic_read(&cmd
->transport_dev_active
)) {
4480 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4483 atomic_set(&cmd
->transport_dev_active
, 0);
4484 transport_all_task_dev_remove_state(cmd
);
4485 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4487 transport_free_dev_tasks(cmd
);
4489 * The Storage engine stopped this struct se_cmd before it was
4490 * send to the fabric frontend for delivery back to the
4491 * Initiator Node. Return this SCSI CDB back with an
4492 * CHECK_CONDITION status.
4495 transport_send_check_condition_and_sense(cmd
,
4496 TCM_NON_EXISTENT_LUN
, 0);
4498 * If the fabric frontend is waiting for this iscsi_cmd_t to
4499 * be released, notify the waiting thread now that LU has
4500 * finished accessing it.
4502 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4503 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4504 pr_debug("SE_LUN[%d] - Detected FE stop for"
4505 " struct se_cmd: %p ITT: 0x%08x\n",
4507 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4509 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4511 transport_cmd_check_stop(cmd
, 1, 0);
4512 complete(&cmd
->transport_lun_fe_stop_comp
);
4513 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4516 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4517 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4519 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4520 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4522 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4525 static int transport_clear_lun_thread(void *p
)
4527 struct se_lun
*lun
= (struct se_lun
*)p
;
4529 __transport_clear_lun_from_sessions(lun
);
4530 complete(&lun
->lun_shutdown_comp
);
4535 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4537 struct task_struct
*kt
;
4539 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4540 "tcm_cl_%u", lun
->unpacked_lun
);
4542 pr_err("Unable to start clear_lun thread\n");
4545 wait_for_completion(&lun
->lun_shutdown_comp
);
4550 /* transport_generic_wait_for_tasks():
4552 * Called from frontend or passthrough context to wait for storage engine
4553 * to pause and/or release frontend generated struct se_cmd.
4555 static void transport_generic_wait_for_tasks(
4558 int session_reinstatement
)
4560 unsigned long flags
;
4562 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
))
4565 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4567 * If we are already stopped due to an external event (ie: LUN shutdown)
4568 * sleep until the connection can have the passed struct se_cmd back.
4569 * The cmd->transport_lun_stopped_sem will be upped by
4570 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4571 * has completed its operation on the struct se_cmd.
4573 if (atomic_read(&cmd
->transport_lun_stop
)) {
4575 pr_debug("wait_for_tasks: Stopping"
4576 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4577 "_stop_comp); for ITT: 0x%08x\n",
4578 cmd
->se_tfo
->get_task_tag(cmd
));
4580 * There is a special case for WRITES where a FE exception +
4581 * LUN shutdown means ConfigFS context is still sleeping on
4582 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4583 * We go ahead and up transport_lun_stop_comp just to be sure
4586 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4587 complete(&cmd
->transport_lun_stop_comp
);
4588 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4589 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4591 transport_all_task_dev_remove_state(cmd
);
4593 * At this point, the frontend who was the originator of this
4594 * struct se_cmd, now owns the structure and can be released through
4595 * normal means below.
4597 pr_debug("wait_for_tasks: Stopped"
4598 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4599 "stop_comp); for ITT: 0x%08x\n",
4600 cmd
->se_tfo
->get_task_tag(cmd
));
4602 atomic_set(&cmd
->transport_lun_stop
, 0);
4604 if (!atomic_read(&cmd
->t_transport_active
) ||
4605 atomic_read(&cmd
->t_transport_aborted
))
4608 atomic_set(&cmd
->t_transport_stop
, 1);
4610 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4611 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4612 " = TRUE\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4613 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
,
4614 cmd
->deferred_t_state
);
4616 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4618 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4620 wait_for_completion(&cmd
->t_transport_stop_comp
);
4622 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4623 atomic_set(&cmd
->t_transport_active
, 0);
4624 atomic_set(&cmd
->t_transport_stop
, 0);
4626 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4627 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4628 cmd
->se_tfo
->get_task_tag(cmd
));
4630 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4634 transport_generic_free_cmd(cmd
, 0, session_reinstatement
);
4637 static int transport_get_sense_codes(
4642 *asc
= cmd
->scsi_asc
;
4643 *ascq
= cmd
->scsi_ascq
;
4648 static int transport_set_sense_codes(
4653 cmd
->scsi_asc
= asc
;
4654 cmd
->scsi_ascq
= ascq
;
4659 int transport_send_check_condition_and_sense(
4664 unsigned char *buffer
= cmd
->sense_buffer
;
4665 unsigned long flags
;
4667 u8 asc
= 0, ascq
= 0;
4669 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4670 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4671 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4674 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4675 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4677 if (!reason
&& from_transport
)
4680 if (!from_transport
)
4681 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4683 * Data Segment and SenseLength of the fabric response PDU.
4685 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4686 * from include/scsi/scsi_cmnd.h
4688 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4689 TRANSPORT_SENSE_BUFFER
);
4691 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4692 * SENSE KEY values from include/scsi/scsi.h
4695 case TCM_NON_EXISTENT_LUN
:
4697 buffer
[offset
] = 0x70;
4698 /* ILLEGAL REQUEST */
4699 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4700 /* LOGICAL UNIT NOT SUPPORTED */
4701 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4703 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4704 case TCM_SECTOR_COUNT_TOO_MANY
:
4706 buffer
[offset
] = 0x70;
4707 /* ILLEGAL REQUEST */
4708 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4709 /* INVALID COMMAND OPERATION CODE */
4710 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4712 case TCM_UNKNOWN_MODE_PAGE
:
4714 buffer
[offset
] = 0x70;
4715 /* ILLEGAL REQUEST */
4716 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4717 /* INVALID FIELD IN CDB */
4718 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4720 case TCM_CHECK_CONDITION_ABORT_CMD
:
4722 buffer
[offset
] = 0x70;
4723 /* ABORTED COMMAND */
4724 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4725 /* BUS DEVICE RESET FUNCTION OCCURRED */
4726 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4727 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4729 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4731 buffer
[offset
] = 0x70;
4732 /* ABORTED COMMAND */
4733 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4735 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4736 /* NOT ENOUGH UNSOLICITED DATA */
4737 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4739 case TCM_INVALID_CDB_FIELD
:
4741 buffer
[offset
] = 0x70;
4742 /* ABORTED COMMAND */
4743 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4744 /* INVALID FIELD IN CDB */
4745 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4747 case TCM_INVALID_PARAMETER_LIST
:
4749 buffer
[offset
] = 0x70;
4750 /* ABORTED COMMAND */
4751 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4752 /* INVALID FIELD IN PARAMETER LIST */
4753 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4755 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4757 buffer
[offset
] = 0x70;
4758 /* ABORTED COMMAND */
4759 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4761 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4762 /* UNEXPECTED_UNSOLICITED_DATA */
4763 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4765 case TCM_SERVICE_CRC_ERROR
:
4767 buffer
[offset
] = 0x70;
4768 /* ABORTED COMMAND */
4769 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4770 /* PROTOCOL SERVICE CRC ERROR */
4771 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4773 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4775 case TCM_SNACK_REJECTED
:
4777 buffer
[offset
] = 0x70;
4778 /* ABORTED COMMAND */
4779 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4781 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4782 /* FAILED RETRANSMISSION REQUEST */
4783 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4785 case TCM_WRITE_PROTECTED
:
4787 buffer
[offset
] = 0x70;
4789 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4790 /* WRITE PROTECTED */
4791 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4793 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4795 buffer
[offset
] = 0x70;
4796 /* UNIT ATTENTION */
4797 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4798 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4799 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4800 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4802 case TCM_CHECK_CONDITION_NOT_READY
:
4804 buffer
[offset
] = 0x70;
4806 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4807 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4808 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4809 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4811 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4814 buffer
[offset
] = 0x70;
4815 /* ILLEGAL REQUEST */
4816 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4817 /* LOGICAL UNIT COMMUNICATION FAILURE */
4818 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4822 * This code uses linux/include/scsi/scsi.h SAM status codes!
4824 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4826 * Automatically padded, this value is encoded in the fabric's
4827 * data_length response PDU containing the SCSI defined sense data.
4829 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4832 return cmd
->se_tfo
->queue_status(cmd
);
4834 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4836 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4840 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4842 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4845 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4846 " status for CDB: 0x%02x ITT: 0x%08x\n",
4848 cmd
->se_tfo
->get_task_tag(cmd
));
4850 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4851 cmd
->se_tfo
->queue_status(cmd
);
4856 EXPORT_SYMBOL(transport_check_aborted_status
);
4858 void transport_send_task_abort(struct se_cmd
*cmd
)
4860 unsigned long flags
;
4862 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4863 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4864 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4867 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4870 * If there are still expected incoming fabric WRITEs, we wait
4871 * until until they have completed before sending a TASK_ABORTED
4872 * response. This response with TASK_ABORTED status will be
4873 * queued back to fabric module by transport_check_aborted_status().
4875 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4876 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4877 atomic_inc(&cmd
->t_transport_aborted
);
4878 smp_mb__after_atomic_inc();
4879 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4880 transport_new_cmd_failure(cmd
);
4884 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4886 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4887 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4888 cmd
->se_tfo
->get_task_tag(cmd
));
4890 cmd
->se_tfo
->queue_status(cmd
);
4893 /* transport_generic_do_tmr():
4897 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4899 struct se_device
*dev
= cmd
->se_dev
;
4900 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4903 switch (tmr
->function
) {
4904 case TMR_ABORT_TASK
:
4905 tmr
->response
= TMR_FUNCTION_REJECTED
;
4907 case TMR_ABORT_TASK_SET
:
4909 case TMR_CLEAR_TASK_SET
:
4910 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4913 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4914 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4915 TMR_FUNCTION_REJECTED
;
4917 case TMR_TARGET_WARM_RESET
:
4918 tmr
->response
= TMR_FUNCTION_REJECTED
;
4920 case TMR_TARGET_COLD_RESET
:
4921 tmr
->response
= TMR_FUNCTION_REJECTED
;
4924 pr_err("Uknown TMR function: 0x%02x.\n",
4926 tmr
->response
= TMR_FUNCTION_REJECTED
;
4930 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4931 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4933 transport_cmd_check_stop(cmd
, 2, 0);
4938 * Called with spin_lock_irq(&dev->execute_task_lock); held
4941 static struct se_task
*
4942 transport_get_task_from_state_list(struct se_device
*dev
)
4944 struct se_task
*task
;
4946 if (list_empty(&dev
->state_task_list
))
4949 list_for_each_entry(task
, &dev
->state_task_list
, t_state_list
)
4952 list_del(&task
->t_state_list
);
4953 atomic_set(&task
->task_state_active
, 0);
4958 static void transport_processing_shutdown(struct se_device
*dev
)
4961 struct se_task
*task
;
4962 unsigned long flags
;
4964 * Empty the struct se_device's struct se_task state list.
4966 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
4967 while ((task
= transport_get_task_from_state_list(dev
))) {
4968 if (!task
->task_se_cmd
) {
4969 pr_err("task->task_se_cmd is NULL!\n");
4972 cmd
= task
->task_se_cmd
;
4974 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
4976 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4978 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
4979 " i_state: %d, t_state/def_t_state:"
4980 " %d/%d cdb: 0x%02x\n", cmd
, task
,
4981 cmd
->se_tfo
->get_task_tag(cmd
),
4982 cmd
->se_tfo
->get_cmd_state(cmd
),
4983 cmd
->t_state
, cmd
->deferred_t_state
,
4984 cmd
->t_task_cdb
[0]);
4985 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
4986 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
4987 " t_transport_stop: %d t_transport_sent: %d\n",
4988 cmd
->se_tfo
->get_task_tag(cmd
),
4989 cmd
->t_task_list_num
,
4990 atomic_read(&cmd
->t_task_cdbs_left
),
4991 atomic_read(&cmd
->t_task_cdbs_sent
),
4992 atomic_read(&cmd
->t_transport_active
),
4993 atomic_read(&cmd
->t_transport_stop
),
4994 atomic_read(&cmd
->t_transport_sent
));
4996 if (atomic_read(&task
->task_active
)) {
4997 atomic_set(&task
->task_stop
, 1);
4998 spin_unlock_irqrestore(
4999 &cmd
->t_state_lock
, flags
);
5001 pr_debug("Waiting for task: %p to shutdown for dev:"
5002 " %p\n", task
, dev
);
5003 wait_for_completion(&task
->task_stop_comp
);
5004 pr_debug("Completed task: %p shutdown for dev: %p\n",
5007 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
5008 atomic_dec(&cmd
->t_task_cdbs_left
);
5010 atomic_set(&task
->task_active
, 0);
5011 atomic_set(&task
->task_stop
, 0);
5013 if (atomic_read(&task
->task_execute_queue
) != 0)
5014 transport_remove_task_from_execute_queue(task
, dev
);
5016 __transport_stop_task_timer(task
, &flags
);
5018 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_ex_left
)) {
5019 spin_unlock_irqrestore(
5020 &cmd
->t_state_lock
, flags
);
5022 pr_debug("Skipping task: %p, dev: %p for"
5023 " t_task_cdbs_ex_left: %d\n", task
, dev
,
5024 atomic_read(&cmd
->t_task_cdbs_ex_left
));
5026 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5030 if (atomic_read(&cmd
->t_transport_active
)) {
5031 pr_debug("got t_transport_active = 1 for task: %p, dev:"
5032 " %p\n", task
, dev
);
5034 if (atomic_read(&cmd
->t_fe_count
)) {
5035 spin_unlock_irqrestore(
5036 &cmd
->t_state_lock
, flags
);
5037 transport_send_check_condition_and_sense(
5038 cmd
, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
,
5040 transport_remove_cmd_from_queue(cmd
,
5041 &cmd
->se_dev
->dev_queue_obj
);
5043 transport_lun_remove_cmd(cmd
);
5044 transport_cmd_check_stop(cmd
, 1, 0);
5046 spin_unlock_irqrestore(
5047 &cmd
->t_state_lock
, flags
);
5049 transport_remove_cmd_from_queue(cmd
,
5050 &cmd
->se_dev
->dev_queue_obj
);
5052 transport_lun_remove_cmd(cmd
);
5054 if (transport_cmd_check_stop(cmd
, 1, 0))
5055 transport_put_cmd(cmd
);
5058 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5061 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
5064 if (atomic_read(&cmd
->t_fe_count
)) {
5065 spin_unlock_irqrestore(
5066 &cmd
->t_state_lock
, flags
);
5067 transport_send_check_condition_and_sense(cmd
,
5068 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
5069 transport_remove_cmd_from_queue(cmd
,
5070 &cmd
->se_dev
->dev_queue_obj
);
5072 transport_lun_remove_cmd(cmd
);
5073 transport_cmd_check_stop(cmd
, 1, 0);
5075 spin_unlock_irqrestore(
5076 &cmd
->t_state_lock
, flags
);
5078 transport_remove_cmd_from_queue(cmd
,
5079 &cmd
->se_dev
->dev_queue_obj
);
5080 transport_lun_remove_cmd(cmd
);
5082 if (transport_cmd_check_stop(cmd
, 1, 0))
5083 transport_put_cmd(cmd
);
5086 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5088 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
5090 * Empty the struct se_device's struct se_cmd list.
5092 while ((cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
))) {
5094 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5097 if (atomic_read(&cmd
->t_fe_count
)) {
5098 transport_send_check_condition_and_sense(cmd
,
5099 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
5101 transport_lun_remove_cmd(cmd
);
5102 transport_cmd_check_stop(cmd
, 1, 0);
5104 transport_lun_remove_cmd(cmd
);
5105 if (transport_cmd_check_stop(cmd
, 1, 0))
5106 transport_put_cmd(cmd
);
5111 /* transport_processing_thread():
5115 static int transport_processing_thread(void *param
)
5119 struct se_device
*dev
= (struct se_device
*) param
;
5121 set_user_nice(current
, -20);
5123 while (!kthread_should_stop()) {
5124 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
5125 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
5126 kthread_should_stop());
5130 spin_lock_irq(&dev
->dev_status_lock
);
5131 if (dev
->dev_status
& TRANSPORT_DEVICE_SHUTDOWN
) {
5132 spin_unlock_irq(&dev
->dev_status_lock
);
5133 transport_processing_shutdown(dev
);
5136 spin_unlock_irq(&dev
->dev_status_lock
);
5139 __transport_execute_tasks(dev
);
5141 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
5145 switch (cmd
->t_state
) {
5146 case TRANSPORT_NEW_CMD
:
5149 case TRANSPORT_NEW_CMD_MAP
:
5150 if (!cmd
->se_tfo
->new_cmd_map
) {
5151 pr_err("cmd->se_tfo->new_cmd_map is"
5152 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5155 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
5157 cmd
->transport_error_status
= ret
;
5158 transport_generic_request_failure(cmd
, NULL
,
5159 0, (cmd
->data_direction
!=
5163 ret
= transport_generic_new_cmd(cmd
);
5167 cmd
->transport_error_status
= ret
;
5168 transport_generic_request_failure(cmd
, NULL
,
5169 0, (cmd
->data_direction
!=
5173 case TRANSPORT_PROCESS_WRITE
:
5174 transport_generic_process_write(cmd
);
5176 case TRANSPORT_COMPLETE_OK
:
5177 transport_stop_all_task_timers(cmd
);
5178 transport_generic_complete_ok(cmd
);
5180 case TRANSPORT_REMOVE
:
5181 transport_put_cmd(cmd
);
5183 case TRANSPORT_FREE_CMD_INTR
:
5184 transport_generic_free_cmd(cmd
, 0, 0);
5186 case TRANSPORT_PROCESS_TMR
:
5187 transport_generic_do_tmr(cmd
);
5189 case TRANSPORT_COMPLETE_FAILURE
:
5190 transport_generic_request_failure(cmd
, NULL
, 1, 1);
5192 case TRANSPORT_COMPLETE_TIMEOUT
:
5193 transport_stop_all_task_timers(cmd
);
5194 transport_generic_request_timeout(cmd
);
5196 case TRANSPORT_COMPLETE_QF_WP
:
5197 transport_generic_write_pending(cmd
);
5200 pr_err("Unknown t_state: %d deferred_t_state:"
5201 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5202 " %u\n", cmd
->t_state
, cmd
->deferred_t_state
,
5203 cmd
->se_tfo
->get_task_tag(cmd
),
5204 cmd
->se_tfo
->get_cmd_state(cmd
),
5205 cmd
->se_lun
->unpacked_lun
);
5213 transport_release_all_cmds(dev
);
5214 dev
->process_thread
= NULL
;