1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/version.h>
30 #include <linux/net.h>
31 #include <linux/delay.h>
32 #include <linux/string.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/blkdev.h>
36 #include <linux/spinlock.h>
37 #include <linux/smp_lock.h>
38 #include <linux/kthread.h>
40 #include <linux/cdrom.h>
41 #include <asm/unaligned.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/libsas.h> /* For TASK_ATTR_* */
48 #include <target/target_core_base.h>
49 #include <target/target_core_device.h>
50 #include <target/target_core_tmr.h>
51 #include <target/target_core_tpg.h>
52 #include <target/target_core_transport.h>
53 #include <target/target_core_fabric_ops.h>
54 #include <target/target_core_configfs.h>
56 #include "target_core_alua.h"
57 #include "target_core_hba.h"
58 #include "target_core_pr.h"
59 #include "target_core_scdb.h"
60 #include "target_core_ua.h"
62 /* #define DEBUG_CDB_HANDLER */
63 #ifdef DEBUG_CDB_HANDLER
64 #define DEBUG_CDB_H(x...) printk(KERN_INFO x)
66 #define DEBUG_CDB_H(x...)
69 /* #define DEBUG_CMD_MAP */
71 #define DEBUG_CMD_M(x...) printk(KERN_INFO x)
73 #define DEBUG_CMD_M(x...)
76 /* #define DEBUG_MEM_ALLOC */
77 #ifdef DEBUG_MEM_ALLOC
78 #define DEBUG_MEM(x...) printk(KERN_INFO x)
80 #define DEBUG_MEM(x...)
83 /* #define DEBUG_MEM2_ALLOC */
84 #ifdef DEBUG_MEM2_ALLOC
85 #define DEBUG_MEM2(x...) printk(KERN_INFO x)
87 #define DEBUG_MEM2(x...)
90 /* #define DEBUG_SG_CALC */
92 #define DEBUG_SC(x...) printk(KERN_INFO x)
94 #define DEBUG_SC(x...)
97 /* #define DEBUG_SE_OBJ */
99 #define DEBUG_SO(x...) printk(KERN_INFO x)
101 #define DEBUG_SO(x...)
104 /* #define DEBUG_CMD_VOL */
106 #define DEBUG_VOL(x...) printk(KERN_INFO x)
108 #define DEBUG_VOL(x...)
111 /* #define DEBUG_CMD_STOP */
112 #ifdef DEBUG_CMD_STOP
113 #define DEBUG_CS(x...) printk(KERN_INFO x)
115 #define DEBUG_CS(x...)
118 /* #define DEBUG_PASSTHROUGH */
119 #ifdef DEBUG_PASSTHROUGH
120 #define DEBUG_PT(x...) printk(KERN_INFO x)
122 #define DEBUG_PT(x...)
125 /* #define DEBUG_TASK_STOP */
126 #ifdef DEBUG_TASK_STOP
127 #define DEBUG_TS(x...) printk(KERN_INFO x)
129 #define DEBUG_TS(x...)
132 /* #define DEBUG_TRANSPORT_STOP */
133 #ifdef DEBUG_TRANSPORT_STOP
134 #define DEBUG_TRANSPORT_S(x...) printk(KERN_INFO x)
136 #define DEBUG_TRANSPORT_S(x...)
139 /* #define DEBUG_TASK_FAILURE */
140 #ifdef DEBUG_TASK_FAILURE
141 #define DEBUG_TF(x...) printk(KERN_INFO x)
143 #define DEBUG_TF(x...)
146 /* #define DEBUG_DEV_OFFLINE */
147 #ifdef DEBUG_DEV_OFFLINE
148 #define DEBUG_DO(x...) printk(KERN_INFO x)
150 #define DEBUG_DO(x...)
153 /* #define DEBUG_TASK_STATE */
154 #ifdef DEBUG_TASK_STATE
155 #define DEBUG_TSTATE(x...) printk(KERN_INFO x)
157 #define DEBUG_TSTATE(x...)
160 /* #define DEBUG_STATUS_THR */
161 #ifdef DEBUG_STATUS_THR
162 #define DEBUG_ST(x...) printk(KERN_INFO x)
164 #define DEBUG_ST(x...)
167 /* #define DEBUG_TASK_TIMEOUT */
168 #ifdef DEBUG_TASK_TIMEOUT
169 #define DEBUG_TT(x...) printk(KERN_INFO x)
171 #define DEBUG_TT(x...)
174 /* #define DEBUG_GENERIC_REQUEST_FAILURE */
175 #ifdef DEBUG_GENERIC_REQUEST_FAILURE
176 #define DEBUG_GRF(x...) printk(KERN_INFO x)
178 #define DEBUG_GRF(x...)
181 /* #define DEBUG_SAM_TASK_ATTRS */
182 #ifdef DEBUG_SAM_TASK_ATTRS
183 #define DEBUG_STA(x...) printk(KERN_INFO x)
185 #define DEBUG_STA(x...)
188 struct se_global
*se_global
;
190 static struct kmem_cache
*se_cmd_cache
;
191 static struct kmem_cache
*se_sess_cache
;
192 struct kmem_cache
*se_tmr_req_cache
;
193 struct kmem_cache
*se_ua_cache
;
194 struct kmem_cache
*se_mem_cache
;
195 struct kmem_cache
*t10_pr_reg_cache
;
196 struct kmem_cache
*t10_alua_lu_gp_cache
;
197 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
198 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
199 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
201 /* Used for transport_dev_get_map_*() */
202 typedef int (*map_func_t
)(struct se_task
*, u32
);
204 static int transport_generic_write_pending(struct se_cmd
*);
205 static int transport_processing_thread(void *);
206 static int __transport_execute_tasks(struct se_device
*dev
);
207 static void transport_complete_task_attr(struct se_cmd
*cmd
);
208 static void transport_direct_request_timeout(struct se_cmd
*cmd
);
209 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
210 static u32
transport_generic_get_cdb_count(struct se_cmd
*cmd
,
211 unsigned long long starting_lba
, u32 sectors
,
212 enum dma_data_direction data_direction
,
213 struct list_head
*mem_list
, int set_counts
);
214 static int transport_generic_get_mem(struct se_cmd
*cmd
, u32 length
,
216 static int transport_generic_remove(struct se_cmd
*cmd
,
217 int release_to_pool
, int session_reinstatement
);
218 static int transport_get_sectors(struct se_cmd
*cmd
);
219 static struct list_head
*transport_init_se_mem_list(void);
220 static int transport_map_sg_to_mem(struct se_cmd
*cmd
,
221 struct list_head
*se_mem_list
, void *in_mem
,
223 static void transport_memcpy_se_mem_read_contig(struct se_cmd
*cmd
,
224 unsigned char *dst
, struct list_head
*se_mem_list
);
225 static void transport_release_fe_cmd(struct se_cmd
*cmd
);
226 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
227 struct se_queue_obj
*qobj
);
228 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
229 static void transport_stop_all_task_timers(struct se_cmd
*cmd
);
231 int transport_emulate_control_cdb(struct se_task
*task
);
233 int init_se_global(void)
235 struct se_global
*global
;
237 global
= kzalloc(sizeof(struct se_global
), GFP_KERNEL
);
239 printk(KERN_ERR
"Unable to allocate memory for struct se_global\n");
243 INIT_LIST_HEAD(&global
->g_lu_gps_list
);
244 INIT_LIST_HEAD(&global
->g_se_tpg_list
);
245 INIT_LIST_HEAD(&global
->g_hba_list
);
246 INIT_LIST_HEAD(&global
->g_se_dev_list
);
247 spin_lock_init(&global
->g_device_lock
);
248 spin_lock_init(&global
->hba_lock
);
249 spin_lock_init(&global
->se_tpg_lock
);
250 spin_lock_init(&global
->lu_gps_lock
);
251 spin_lock_init(&global
->plugin_class_lock
);
253 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
254 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
255 if (!(se_cmd_cache
)) {
256 printk(KERN_ERR
"kmem_cache_create for struct se_cmd failed\n");
259 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
260 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
262 if (!(se_tmr_req_cache
)) {
263 printk(KERN_ERR
"kmem_cache_create() for struct se_tmr_req"
267 se_sess_cache
= kmem_cache_create("se_sess_cache",
268 sizeof(struct se_session
), __alignof__(struct se_session
),
270 if (!(se_sess_cache
)) {
271 printk(KERN_ERR
"kmem_cache_create() for struct se_session"
275 se_ua_cache
= kmem_cache_create("se_ua_cache",
276 sizeof(struct se_ua
), __alignof__(struct se_ua
),
278 if (!(se_ua_cache
)) {
279 printk(KERN_ERR
"kmem_cache_create() for struct se_ua failed\n");
282 se_mem_cache
= kmem_cache_create("se_mem_cache",
283 sizeof(struct se_mem
), __alignof__(struct se_mem
), 0, NULL
);
284 if (!(se_mem_cache
)) {
285 printk(KERN_ERR
"kmem_cache_create() for struct se_mem failed\n");
288 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
289 sizeof(struct t10_pr_registration
),
290 __alignof__(struct t10_pr_registration
), 0, NULL
);
291 if (!(t10_pr_reg_cache
)) {
292 printk(KERN_ERR
"kmem_cache_create() for struct t10_pr_registration"
296 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
297 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
299 if (!(t10_alua_lu_gp_cache
)) {
300 printk(KERN_ERR
"kmem_cache_create() for t10_alua_lu_gp_cache"
304 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
305 sizeof(struct t10_alua_lu_gp_member
),
306 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
307 if (!(t10_alua_lu_gp_mem_cache
)) {
308 printk(KERN_ERR
"kmem_cache_create() for t10_alua_lu_gp_mem_"
312 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
313 sizeof(struct t10_alua_tg_pt_gp
),
314 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
315 if (!(t10_alua_tg_pt_gp_cache
)) {
316 printk(KERN_ERR
"kmem_cache_create() for t10_alua_tg_pt_gp_"
320 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
321 "t10_alua_tg_pt_gp_mem_cache",
322 sizeof(struct t10_alua_tg_pt_gp_member
),
323 __alignof__(struct t10_alua_tg_pt_gp_member
),
325 if (!(t10_alua_tg_pt_gp_mem_cache
)) {
326 printk(KERN_ERR
"kmem_cache_create() for t10_alua_tg_pt_gp_"
336 kmem_cache_destroy(se_cmd_cache
);
337 if (se_tmr_req_cache
)
338 kmem_cache_destroy(se_tmr_req_cache
);
340 kmem_cache_destroy(se_sess_cache
);
342 kmem_cache_destroy(se_ua_cache
);
344 kmem_cache_destroy(se_mem_cache
);
345 if (t10_pr_reg_cache
)
346 kmem_cache_destroy(t10_pr_reg_cache
);
347 if (t10_alua_lu_gp_cache
)
348 kmem_cache_destroy(t10_alua_lu_gp_cache
);
349 if (t10_alua_lu_gp_mem_cache
)
350 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
351 if (t10_alua_tg_pt_gp_cache
)
352 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
353 if (t10_alua_tg_pt_gp_mem_cache
)
354 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
359 void release_se_global(void)
361 struct se_global
*global
;
367 kmem_cache_destroy(se_cmd_cache
);
368 kmem_cache_destroy(se_tmr_req_cache
);
369 kmem_cache_destroy(se_sess_cache
);
370 kmem_cache_destroy(se_ua_cache
);
371 kmem_cache_destroy(se_mem_cache
);
372 kmem_cache_destroy(t10_pr_reg_cache
);
373 kmem_cache_destroy(t10_alua_lu_gp_cache
);
374 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
375 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
376 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
382 /* SCSI statistics table index */
383 static struct scsi_index_table scsi_index_table
;
386 * Initialize the index table for allocating unique row indexes to various mib
389 void init_scsi_index_table(void)
391 memset(&scsi_index_table
, 0, sizeof(struct scsi_index_table
));
392 spin_lock_init(&scsi_index_table
.lock
);
396 * Allocate a new row index for the entry type specified
398 u32
scsi_get_new_index(scsi_index_t type
)
402 if ((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
)) {
403 printk(KERN_ERR
"Invalid index type %d\n", type
);
407 spin_lock(&scsi_index_table
.lock
);
408 new_index
= ++scsi_index_table
.scsi_mib_index
[type
];
410 new_index
= ++scsi_index_table
.scsi_mib_index
[type
];
411 spin_unlock(&scsi_index_table
.lock
);
416 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
418 atomic_set(&qobj
->queue_cnt
, 0);
419 INIT_LIST_HEAD(&qobj
->qobj_list
);
420 init_waitqueue_head(&qobj
->thread_wq
);
421 spin_lock_init(&qobj
->cmd_queue_lock
);
423 EXPORT_SYMBOL(transport_init_queue_obj
);
425 static int transport_subsystem_reqmods(void)
429 ret
= request_module("target_core_iblock");
431 printk(KERN_ERR
"Unable to load target_core_iblock\n");
433 ret
= request_module("target_core_file");
435 printk(KERN_ERR
"Unable to load target_core_file\n");
437 ret
= request_module("target_core_pscsi");
439 printk(KERN_ERR
"Unable to load target_core_pscsi\n");
441 ret
= request_module("target_core_stgt");
443 printk(KERN_ERR
"Unable to load target_core_stgt\n");
448 int transport_subsystem_check_init(void)
450 if (se_global
->g_sub_api_initialized
)
453 * Request the loading of known TCM subsystem plugins..
455 if (transport_subsystem_reqmods() < 0)
458 se_global
->g_sub_api_initialized
= 1;
462 struct se_session
*transport_init_session(void)
464 struct se_session
*se_sess
;
466 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
468 printk(KERN_ERR
"Unable to allocate struct se_session from"
470 return ERR_PTR(-ENOMEM
);
472 INIT_LIST_HEAD(&se_sess
->sess_list
);
473 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
477 EXPORT_SYMBOL(transport_init_session
);
480 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
482 void __transport_register_session(
483 struct se_portal_group
*se_tpg
,
484 struct se_node_acl
*se_nacl
,
485 struct se_session
*se_sess
,
486 void *fabric_sess_ptr
)
488 unsigned char buf
[PR_REG_ISID_LEN
];
490 se_sess
->se_tpg
= se_tpg
;
491 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
493 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
495 * Only set for struct se_session's that will actually be moving I/O.
496 * eg: *NOT* discovery sessions.
500 * If the fabric module supports an ISID based TransportID,
501 * save this value in binary from the fabric I_T Nexus now.
503 if (TPG_TFO(se_tpg
)->sess_get_initiator_sid
!= NULL
) {
504 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
505 TPG_TFO(se_tpg
)->sess_get_initiator_sid(se_sess
,
506 &buf
[0], PR_REG_ISID_LEN
);
507 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
509 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
511 * The se_nacl->nacl_sess pointer will be set to the
512 * last active I_T Nexus for each struct se_node_acl.
514 se_nacl
->nacl_sess
= se_sess
;
516 list_add_tail(&se_sess
->sess_acl_list
,
517 &se_nacl
->acl_sess_list
);
518 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
520 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
522 printk(KERN_INFO
"TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
523 TPG_TFO(se_tpg
)->get_fabric_name(), se_sess
->fabric_sess_ptr
);
525 EXPORT_SYMBOL(__transport_register_session
);
527 void transport_register_session(
528 struct se_portal_group
*se_tpg
,
529 struct se_node_acl
*se_nacl
,
530 struct se_session
*se_sess
,
531 void *fabric_sess_ptr
)
533 spin_lock_bh(&se_tpg
->session_lock
);
534 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
535 spin_unlock_bh(&se_tpg
->session_lock
);
537 EXPORT_SYMBOL(transport_register_session
);
539 void transport_deregister_session_configfs(struct se_session
*se_sess
)
541 struct se_node_acl
*se_nacl
;
544 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
546 se_nacl
= se_sess
->se_node_acl
;
548 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
549 list_del(&se_sess
->sess_acl_list
);
551 * If the session list is empty, then clear the pointer.
552 * Otherwise, set the struct se_session pointer from the tail
553 * element of the per struct se_node_acl active session list.
555 if (list_empty(&se_nacl
->acl_sess_list
))
556 se_nacl
->nacl_sess
= NULL
;
558 se_nacl
->nacl_sess
= container_of(
559 se_nacl
->acl_sess_list
.prev
,
560 struct se_session
, sess_acl_list
);
562 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
565 EXPORT_SYMBOL(transport_deregister_session_configfs
);
567 void transport_free_session(struct se_session
*se_sess
)
569 kmem_cache_free(se_sess_cache
, se_sess
);
571 EXPORT_SYMBOL(transport_free_session
);
573 void transport_deregister_session(struct se_session
*se_sess
)
575 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
576 struct se_node_acl
*se_nacl
;
579 transport_free_session(se_sess
);
583 spin_lock_bh(&se_tpg
->session_lock
);
584 list_del(&se_sess
->sess_list
);
585 se_sess
->se_tpg
= NULL
;
586 se_sess
->fabric_sess_ptr
= NULL
;
587 spin_unlock_bh(&se_tpg
->session_lock
);
590 * Determine if we need to do extra work for this initiator node's
591 * struct se_node_acl if it had been previously dynamically generated.
593 se_nacl
= se_sess
->se_node_acl
;
595 spin_lock_bh(&se_tpg
->acl_node_lock
);
596 if (se_nacl
->dynamic_node_acl
) {
597 if (!(TPG_TFO(se_tpg
)->tpg_check_demo_mode_cache(
599 list_del(&se_nacl
->acl_list
);
600 se_tpg
->num_node_acls
--;
601 spin_unlock_bh(&se_tpg
->acl_node_lock
);
603 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
604 core_free_device_list_for_node(se_nacl
, se_tpg
);
605 TPG_TFO(se_tpg
)->tpg_release_fabric_acl(se_tpg
,
607 spin_lock_bh(&se_tpg
->acl_node_lock
);
610 spin_unlock_bh(&se_tpg
->acl_node_lock
);
613 transport_free_session(se_sess
);
615 printk(KERN_INFO
"TARGET_CORE[%s]: Deregistered fabric_sess\n",
616 TPG_TFO(se_tpg
)->get_fabric_name());
618 EXPORT_SYMBOL(transport_deregister_session
);
621 * Called with T_TASK(cmd)->t_state_lock held.
623 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
625 struct se_device
*dev
;
626 struct se_task
*task
;
632 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
637 if (atomic_read(&task
->task_active
))
640 if (!(atomic_read(&task
->task_state_active
)))
643 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
644 list_del(&task
->t_state_list
);
645 DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n",
646 CMD_TFO(cmd
)->tfo_get_task_tag(cmd
), dev
, task
);
647 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
649 atomic_set(&task
->task_state_active
, 0);
650 atomic_dec(&T_TASK(cmd
)->t_task_cdbs_ex_left
);
654 /* transport_cmd_check_stop():
656 * 'transport_off = 1' determines if t_transport_active should be cleared.
657 * 'transport_off = 2' determines if task_dev_state should be removed.
659 * A non-zero u8 t_state sets cmd->t_state.
660 * Returns 1 when command is stopped, else 0.
662 static int transport_cmd_check_stop(
669 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
671 * Determine if IOCTL context caller in requesting the stopping of this
672 * command for LUN shutdown purposes.
674 if (atomic_read(&T_TASK(cmd
)->transport_lun_stop
)) {
675 DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->transport_lun_stop)"
676 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
677 CMD_TFO(cmd
)->get_task_tag(cmd
));
679 cmd
->deferred_t_state
= cmd
->t_state
;
680 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
681 atomic_set(&T_TASK(cmd
)->t_transport_active
, 0);
682 if (transport_off
== 2)
683 transport_all_task_dev_remove_state(cmd
);
684 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
686 complete(&T_TASK(cmd
)->transport_lun_stop_comp
);
690 * Determine if frontend context caller is requesting the stopping of
691 * this command for frontend excpections.
693 if (atomic_read(&T_TASK(cmd
)->t_transport_stop
)) {
694 DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->t_transport_stop) =="
695 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
696 CMD_TFO(cmd
)->get_task_tag(cmd
));
698 cmd
->deferred_t_state
= cmd
->t_state
;
699 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
700 if (transport_off
== 2)
701 transport_all_task_dev_remove_state(cmd
);
704 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
707 if (transport_off
== 2)
709 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
711 complete(&T_TASK(cmd
)->t_transport_stop_comp
);
715 atomic_set(&T_TASK(cmd
)->t_transport_active
, 0);
716 if (transport_off
== 2) {
717 transport_all_task_dev_remove_state(cmd
);
719 * Clear struct se_cmd->se_lun before the transport_off == 2
720 * handoff to fabric module.
724 * Some fabric modules like tcm_loop can release
725 * their internally allocated I/O refrence now and
728 if (CMD_TFO(cmd
)->check_stop_free
!= NULL
) {
729 spin_unlock_irqrestore(
730 &T_TASK(cmd
)->t_state_lock
, flags
);
732 CMD_TFO(cmd
)->check_stop_free(cmd
);
736 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
740 cmd
->t_state
= t_state
;
741 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
746 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
748 return transport_cmd_check_stop(cmd
, 2, 0);
751 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
753 struct se_lun
*lun
= SE_LUN(cmd
);
759 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
760 if (!(atomic_read(&T_TASK(cmd
)->transport_dev_active
))) {
761 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
764 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 0);
765 transport_all_task_dev_remove_state(cmd
);
766 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
768 transport_free_dev_tasks(cmd
);
771 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
772 if (atomic_read(&T_TASK(cmd
)->transport_lun_active
)) {
773 list_del(&cmd
->se_lun_list
);
774 atomic_set(&T_TASK(cmd
)->transport_lun_active
, 0);
776 printk(KERN_INFO
"Removed ITT: 0x%08x from LUN LIST[%d]\n"
777 CMD_TFO(cmd
)->get_task_tag(cmd
), lun
->unpacked_lun
);
780 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
783 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
785 transport_remove_cmd_from_queue(cmd
, SE_DEV(cmd
)->dev_queue_obj
);
786 transport_lun_remove_cmd(cmd
);
788 if (transport_cmd_check_stop_to_fabric(cmd
))
791 transport_generic_remove(cmd
, 0, 0);
794 void transport_cmd_finish_abort_tmr(struct se_cmd
*cmd
)
796 transport_remove_cmd_from_queue(cmd
, SE_DEV(cmd
)->dev_queue_obj
);
798 if (transport_cmd_check_stop_to_fabric(cmd
))
801 transport_generic_remove(cmd
, 0, 0);
804 static int transport_add_cmd_to_queue(
808 struct se_device
*dev
= cmd
->se_dev
;
809 struct se_queue_obj
*qobj
= dev
->dev_queue_obj
;
810 struct se_queue_req
*qr
;
813 qr
= kzalloc(sizeof(struct se_queue_req
), GFP_ATOMIC
);
815 printk(KERN_ERR
"Unable to allocate memory for"
816 " struct se_queue_req\n");
819 INIT_LIST_HEAD(&qr
->qr_list
);
821 qr
->cmd
= (void *)cmd
;
825 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
826 cmd
->t_state
= t_state
;
827 atomic_set(&T_TASK(cmd
)->t_transport_active
, 1);
828 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
831 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
832 list_add_tail(&qr
->qr_list
, &qobj
->qobj_list
);
833 atomic_inc(&T_TASK(cmd
)->t_transport_queue_active
);
834 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
836 atomic_inc(&qobj
->queue_cnt
);
837 wake_up_interruptible(&qobj
->thread_wq
);
842 * Called with struct se_queue_obj->cmd_queue_lock held.
844 static struct se_queue_req
*
845 __transport_get_qr_from_queue(struct se_queue_obj
*qobj
)
848 struct se_queue_req
*qr
= NULL
;
850 if (list_empty(&qobj
->qobj_list
))
853 list_for_each_entry(qr
, &qobj
->qobj_list
, qr_list
)
857 cmd
= (struct se_cmd
*)qr
->cmd
;
858 atomic_dec(&T_TASK(cmd
)->t_transport_queue_active
);
860 list_del(&qr
->qr_list
);
861 atomic_dec(&qobj
->queue_cnt
);
866 static struct se_queue_req
*
867 transport_get_qr_from_queue(struct se_queue_obj
*qobj
)
870 struct se_queue_req
*qr
;
873 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
874 if (list_empty(&qobj
->qobj_list
)) {
875 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
879 list_for_each_entry(qr
, &qobj
->qobj_list
, qr_list
)
883 cmd
= (struct se_cmd
*)qr
->cmd
;
884 atomic_dec(&T_TASK(cmd
)->t_transport_queue_active
);
886 list_del(&qr
->qr_list
);
887 atomic_dec(&qobj
->queue_cnt
);
888 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
893 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
894 struct se_queue_obj
*qobj
)
896 struct se_cmd
*q_cmd
;
897 struct se_queue_req
*qr
= NULL
, *qr_p
= NULL
;
900 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
901 if (!(atomic_read(&T_TASK(cmd
)->t_transport_queue_active
))) {
902 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
906 list_for_each_entry_safe(qr
, qr_p
, &qobj
->qobj_list
, qr_list
) {
907 q_cmd
= (struct se_cmd
*)qr
->cmd
;
911 atomic_dec(&T_TASK(q_cmd
)->t_transport_queue_active
);
912 atomic_dec(&qobj
->queue_cnt
);
913 list_del(&qr
->qr_list
);
916 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
918 if (atomic_read(&T_TASK(cmd
)->t_transport_queue_active
)) {
919 printk(KERN_ERR
"ITT: 0x%08x t_transport_queue_active: %d\n",
920 CMD_TFO(cmd
)->get_task_tag(cmd
),
921 atomic_read(&T_TASK(cmd
)->t_transport_queue_active
));
926 * Completion function used by TCM subsystem plugins (such as FILEIO)
927 * for queueing up response from struct se_subsystem_api->do_task()
929 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
931 struct se_task
*task
= list_entry(T_TASK(cmd
)->t_task_list
.next
,
932 struct se_task
, t_list
);
935 cmd
->scsi_status
= SAM_STAT_GOOD
;
936 task
->task_scsi_status
= GOOD
;
938 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
939 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
940 TASK_CMD(task
)->transport_error_status
=
941 PYX_TRANSPORT_ILLEGAL_REQUEST
;
944 transport_complete_task(task
, good
);
946 EXPORT_SYMBOL(transport_complete_sync_cache
);
948 /* transport_complete_task():
950 * Called from interrupt and non interrupt context depending
951 * on the transport plugin.
953 void transport_complete_task(struct se_task
*task
, int success
)
955 struct se_cmd
*cmd
= TASK_CMD(task
);
956 struct se_device
*dev
= task
->se_dev
;
960 printk(KERN_INFO
"task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
961 T_TASK(cmd
)->t_task_cdb
[0], dev
);
964 spin_lock_irqsave(&SE_HBA(dev
)->hba_queue_lock
, flags
);
965 atomic_inc(&dev
->depth_left
);
966 atomic_inc(&SE_HBA(dev
)->left_queue_depth
);
967 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
970 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
971 atomic_set(&task
->task_active
, 0);
974 * See if any sense data exists, if so set the TASK_SENSE flag.
975 * Also check for any other post completion work that needs to be
976 * done by the plugins.
978 if (dev
&& dev
->transport
->transport_complete
) {
979 if (dev
->transport
->transport_complete(task
) != 0) {
980 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
981 task
->task_sense
= 1;
987 * See if we are waiting for outstanding struct se_task
988 * to complete for an exception condition
990 if (atomic_read(&task
->task_stop
)) {
992 * Decrement T_TASK(cmd)->t_se_count if this task had
993 * previously thrown its timeout exception handler.
995 if (atomic_read(&task
->task_timeout
)) {
996 atomic_dec(&T_TASK(cmd
)->t_se_count
);
997 atomic_set(&task
->task_timeout
, 0);
999 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1001 complete(&task
->task_stop_comp
);
1005 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
1006 * left counter to determine when the struct se_cmd is ready to be queued to
1007 * the processing thread.
1009 if (atomic_read(&task
->task_timeout
)) {
1010 if (!(atomic_dec_and_test(
1011 &T_TASK(cmd
)->t_task_cdbs_timeout_left
))) {
1012 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
1016 t_state
= TRANSPORT_COMPLETE_TIMEOUT
;
1017 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1019 transport_add_cmd_to_queue(cmd
, t_state
);
1022 atomic_dec(&T_TASK(cmd
)->t_task_cdbs_timeout_left
);
1025 * Decrement the outstanding t_task_cdbs_left count. The last
1026 * struct se_task from struct se_cmd will complete itself into the
1027 * device queue depending upon int success.
1029 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_task_cdbs_left
))) {
1031 T_TASK(cmd
)->t_tasks_failed
= 1;
1033 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1037 if (!success
|| T_TASK(cmd
)->t_tasks_failed
) {
1038 t_state
= TRANSPORT_COMPLETE_FAILURE
;
1039 if (!task
->task_error_status
) {
1040 task
->task_error_status
=
1041 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
1042 cmd
->transport_error_status
=
1043 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
1046 atomic_set(&T_TASK(cmd
)->t_transport_complete
, 1);
1047 t_state
= TRANSPORT_COMPLETE_OK
;
1049 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1051 transport_add_cmd_to_queue(cmd
, t_state
);
1053 EXPORT_SYMBOL(transport_complete_task
);
1056 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
1057 * struct se_task list are ready to be added to the active execution list
1060 * Called with se_dev_t->execute_task_lock called.
1062 static inline int transport_add_task_check_sam_attr(
1063 struct se_task
*task
,
1064 struct se_task
*task_prev
,
1065 struct se_device
*dev
)
1068 * No SAM Task attribute emulation enabled, add to tail of
1071 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
1072 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
1076 * HEAD_OF_QUEUE attribute for received CDB, which means
1077 * the first task that is associated with a struct se_cmd goes to
1078 * head of the struct se_device->execute_task_list, and task_prev
1079 * after that for each subsequent task
1081 if (task
->task_se_cmd
->sam_task_attr
== TASK_ATTR_HOQ
) {
1082 list_add(&task
->t_execute_list
,
1083 (task_prev
!= NULL
) ?
1084 &task_prev
->t_execute_list
:
1085 &dev
->execute_task_list
);
1087 DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
1088 " in execution queue\n",
1089 T_TASK(task
->task_se_cmd
)->t_task_cdb
[0]);
1093 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
1094 * transitioned from Dermant -> Active state, and are added to the end
1095 * of the struct se_device->execute_task_list
1097 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
1101 /* __transport_add_task_to_execute_queue():
1103 * Called with se_dev_t->execute_task_lock called.
1105 static void __transport_add_task_to_execute_queue(
1106 struct se_task
*task
,
1107 struct se_task
*task_prev
,
1108 struct se_device
*dev
)
1112 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
1113 atomic_inc(&dev
->execute_tasks
);
1115 if (atomic_read(&task
->task_state_active
))
1118 * Determine if this task needs to go to HEAD_OF_QUEUE for the
1119 * state list as well. Running with SAM Task Attribute emulation
1120 * will always return head_of_queue == 0 here
1123 list_add(&task
->t_state_list
, (task_prev
) ?
1124 &task_prev
->t_state_list
:
1125 &dev
->state_task_list
);
1127 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
1129 atomic_set(&task
->task_state_active
, 1);
1131 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1132 CMD_TFO(task
->task_se_cmd
)->get_task_tag(task
->task_se_cmd
),
1136 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
1138 struct se_device
*dev
;
1139 struct se_task
*task
;
1140 unsigned long flags
;
1142 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
1143 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
1146 if (atomic_read(&task
->task_state_active
))
1149 spin_lock(&dev
->execute_task_lock
);
1150 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
1151 atomic_set(&task
->task_state_active
, 1);
1153 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1154 CMD_TFO(task
->task_se_cmd
)->get_task_tag(
1155 task
->task_se_cmd
), task
, dev
);
1157 spin_unlock(&dev
->execute_task_lock
);
1159 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1162 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
1164 struct se_device
*dev
= SE_DEV(cmd
);
1165 struct se_task
*task
, *task_prev
= NULL
;
1166 unsigned long flags
;
1168 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
1169 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
1170 if (atomic_read(&task
->task_execute_queue
))
1173 * __transport_add_task_to_execute_queue() handles the
1174 * SAM Task Attribute emulation if enabled
1176 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
1177 atomic_set(&task
->task_execute_queue
, 1);
1180 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
1185 /* transport_get_task_from_execute_queue():
1187 * Called with dev->execute_task_lock held.
1189 static struct se_task
*
1190 transport_get_task_from_execute_queue(struct se_device
*dev
)
1192 struct se_task
*task
;
1194 if (list_empty(&dev
->execute_task_list
))
1197 list_for_each_entry(task
, &dev
->execute_task_list
, t_execute_list
)
1200 list_del(&task
->t_execute_list
);
1201 atomic_dec(&dev
->execute_tasks
);
1206 /* transport_remove_task_from_execute_queue():
1210 void transport_remove_task_from_execute_queue(
1211 struct se_task
*task
,
1212 struct se_device
*dev
)
1214 unsigned long flags
;
1216 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
1217 list_del(&task
->t_execute_list
);
1218 atomic_dec(&dev
->execute_tasks
);
1219 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
1222 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
1224 switch (cmd
->data_direction
) {
1227 case DMA_FROM_DEVICE
:
1231 case DMA_BIDIRECTIONAL
:
1240 void transport_dump_dev_state(
1241 struct se_device
*dev
,
1245 *bl
+= sprintf(b
+ *bl
, "Status: ");
1246 switch (dev
->dev_status
) {
1247 case TRANSPORT_DEVICE_ACTIVATED
:
1248 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1250 case TRANSPORT_DEVICE_DEACTIVATED
:
1251 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1253 case TRANSPORT_DEVICE_SHUTDOWN
:
1254 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1256 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1257 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1258 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1261 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1265 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1266 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1268 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1269 DEV_ATTRIB(dev
)->block_size
, DEV_ATTRIB(dev
)->max_sectors
);
1270 *bl
+= sprintf(b
+ *bl
, " ");
1273 /* transport_release_all_cmds():
1277 static void transport_release_all_cmds(struct se_device
*dev
)
1279 struct se_cmd
*cmd
= NULL
;
1280 struct se_queue_req
*qr
= NULL
, *qr_p
= NULL
;
1281 int bug_out
= 0, t_state
;
1282 unsigned long flags
;
1284 spin_lock_irqsave(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
1285 list_for_each_entry_safe(qr
, qr_p
, &dev
->dev_queue_obj
->qobj_list
,
1288 cmd
= (struct se_cmd
*)qr
->cmd
;
1289 t_state
= qr
->state
;
1290 list_del(&qr
->qr_list
);
1292 spin_unlock_irqrestore(&dev
->dev_queue_obj
->cmd_queue_lock
,
1295 printk(KERN_ERR
"Releasing ITT: 0x%08x, i_state: %u,"
1296 " t_state: %u directly\n",
1297 CMD_TFO(cmd
)->get_task_tag(cmd
),
1298 CMD_TFO(cmd
)->get_cmd_state(cmd
), t_state
);
1300 transport_release_fe_cmd(cmd
);
1303 spin_lock_irqsave(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
1305 spin_unlock_irqrestore(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
1312 void transport_dump_vpd_proto_id(
1313 struct t10_vpd
*vpd
,
1314 unsigned char *p_buf
,
1317 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1320 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1321 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1323 switch (vpd
->protocol_identifier
) {
1325 sprintf(buf
+len
, "Fibre Channel\n");
1328 sprintf(buf
+len
, "Parallel SCSI\n");
1331 sprintf(buf
+len
, "SSA\n");
1334 sprintf(buf
+len
, "IEEE 1394\n");
1337 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1341 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1344 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1347 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1351 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1354 sprintf(buf
+len
, "Unknown 0x%02x\n",
1355 vpd
->protocol_identifier
);
1360 strncpy(p_buf
, buf
, p_buf_len
);
1362 printk(KERN_INFO
"%s", buf
);
1366 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1369 * Check if the Protocol Identifier Valid (PIV) bit is set..
1371 * from spc3r23.pdf section 7.5.1
1373 if (page_83
[1] & 0x80) {
1374 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1375 vpd
->protocol_identifier_set
= 1;
1376 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1379 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1381 int transport_dump_vpd_assoc(
1382 struct t10_vpd
*vpd
,
1383 unsigned char *p_buf
,
1386 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1389 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1390 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1392 switch (vpd
->association
) {
1394 sprintf(buf
+len
, "addressed logical unit\n");
1397 sprintf(buf
+len
, "target port\n");
1400 sprintf(buf
+len
, "SCSI target device\n");
1403 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1409 strncpy(p_buf
, buf
, p_buf_len
);
1416 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1419 * The VPD identification association..
1421 * from spc3r23.pdf Section 7.6.3.1 Table 297
1423 vpd
->association
= (page_83
[1] & 0x30);
1424 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1426 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1428 int transport_dump_vpd_ident_type(
1429 struct t10_vpd
*vpd
,
1430 unsigned char *p_buf
,
1433 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1436 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1437 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1439 switch (vpd
->device_identifier_type
) {
1441 sprintf(buf
+len
, "Vendor specific\n");
1444 sprintf(buf
+len
, "T10 Vendor ID based\n");
1447 sprintf(buf
+len
, "EUI-64 based\n");
1450 sprintf(buf
+len
, "NAA\n");
1453 sprintf(buf
+len
, "Relative target port identifier\n");
1456 sprintf(buf
+len
, "SCSI name string\n");
1459 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1460 vpd
->device_identifier_type
);
1466 strncpy(p_buf
, buf
, p_buf_len
);
1473 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1476 * The VPD identifier type..
1478 * from spc3r23.pdf Section 7.6.3.1 Table 298
1480 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1481 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1483 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1485 int transport_dump_vpd_ident(
1486 struct t10_vpd
*vpd
,
1487 unsigned char *p_buf
,
1490 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1493 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1495 switch (vpd
->device_identifier_code_set
) {
1496 case 0x01: /* Binary */
1497 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1498 &vpd
->device_identifier
[0]);
1500 case 0x02: /* ASCII */
1501 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1502 &vpd
->device_identifier
[0]);
1504 case 0x03: /* UTF-8 */
1505 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1506 &vpd
->device_identifier
[0]);
1509 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1510 " 0x%02x", vpd
->device_identifier_code_set
);
1516 strncpy(p_buf
, buf
, p_buf_len
);
1524 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1526 static const char hex_str
[] = "0123456789abcdef";
1527 int j
= 0, i
= 4; /* offset to start of the identifer */
1530 * The VPD Code Set (encoding)
1532 * from spc3r23.pdf Section 7.6.3.1 Table 296
1534 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1535 switch (vpd
->device_identifier_code_set
) {
1536 case 0x01: /* Binary */
1537 vpd
->device_identifier
[j
++] =
1538 hex_str
[vpd
->device_identifier_type
];
1539 while (i
< (4 + page_83
[3])) {
1540 vpd
->device_identifier
[j
++] =
1541 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1542 vpd
->device_identifier
[j
++] =
1543 hex_str
[page_83
[i
] & 0x0f];
1547 case 0x02: /* ASCII */
1548 case 0x03: /* UTF-8 */
1549 while (i
< (4 + page_83
[3]))
1550 vpd
->device_identifier
[j
++] = page_83
[i
++];
1556 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1558 EXPORT_SYMBOL(transport_set_vpd_ident
);
1560 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1563 * If this device is from Target_Core_Mod/pSCSI, disable the
1564 * SAM Task Attribute emulation.
1566 * This is currently not available in upsream Linux/SCSI Target
1567 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1569 if (TRANSPORT(dev
)->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1570 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1574 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1575 DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1576 " device\n", TRANSPORT(dev
)->name
,
1577 TRANSPORT(dev
)->get_device_rev(dev
));
1580 static void scsi_dump_inquiry(struct se_device
*dev
)
1582 struct t10_wwn
*wwn
= DEV_T10_WWN(dev
);
1585 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1587 printk(" Vendor: ");
1588 for (i
= 0; i
< 8; i
++)
1589 if (wwn
->vendor
[i
] >= 0x20)
1590 printk("%c", wwn
->vendor
[i
]);
1595 for (i
= 0; i
< 16; i
++)
1596 if (wwn
->model
[i
] >= 0x20)
1597 printk("%c", wwn
->model
[i
]);
1601 printk(" Revision: ");
1602 for (i
= 0; i
< 4; i
++)
1603 if (wwn
->revision
[i
] >= 0x20)
1604 printk("%c", wwn
->revision
[i
]);
1610 device_type
= TRANSPORT(dev
)->get_device_type(dev
);
1611 printk(" Type: %s ", scsi_device_type(device_type
));
1612 printk(" ANSI SCSI revision: %02x\n",
1613 TRANSPORT(dev
)->get_device_rev(dev
));
1616 struct se_device
*transport_add_device_to_core_hba(
1618 struct se_subsystem_api
*transport
,
1619 struct se_subsystem_dev
*se_dev
,
1621 void *transport_dev
,
1622 struct se_dev_limits
*dev_limits
,
1623 const char *inquiry_prod
,
1624 const char *inquiry_rev
)
1626 int ret
= 0, force_pt
;
1627 struct se_device
*dev
;
1629 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1631 printk(KERN_ERR
"Unable to allocate memory for se_dev_t\n");
1634 dev
->dev_queue_obj
= kzalloc(sizeof(struct se_queue_obj
), GFP_KERNEL
);
1635 if (!(dev
->dev_queue_obj
)) {
1636 printk(KERN_ERR
"Unable to allocate memory for"
1637 " dev->dev_queue_obj\n");
1641 transport_init_queue_obj(dev
->dev_queue_obj
);
1643 dev
->dev_status_queue_obj
= kzalloc(sizeof(struct se_queue_obj
),
1645 if (!(dev
->dev_status_queue_obj
)) {
1646 printk(KERN_ERR
"Unable to allocate memory for"
1647 " dev->dev_status_queue_obj\n");
1648 kfree(dev
->dev_queue_obj
);
1652 transport_init_queue_obj(dev
->dev_status_queue_obj
);
1654 dev
->dev_flags
= device_flags
;
1655 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1656 dev
->dev_ptr
= (void *) transport_dev
;
1658 dev
->se_sub_dev
= se_dev
;
1659 dev
->transport
= transport
;
1660 atomic_set(&dev
->active_cmds
, 0);
1661 INIT_LIST_HEAD(&dev
->dev_list
);
1662 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1663 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1664 INIT_LIST_HEAD(&dev
->execute_task_list
);
1665 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1666 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1667 INIT_LIST_HEAD(&dev
->state_task_list
);
1668 spin_lock_init(&dev
->execute_task_lock
);
1669 spin_lock_init(&dev
->delayed_cmd_lock
);
1670 spin_lock_init(&dev
->ordered_cmd_lock
);
1671 spin_lock_init(&dev
->state_task_lock
);
1672 spin_lock_init(&dev
->dev_alua_lock
);
1673 spin_lock_init(&dev
->dev_reservation_lock
);
1674 spin_lock_init(&dev
->dev_status_lock
);
1675 spin_lock_init(&dev
->dev_status_thr_lock
);
1676 spin_lock_init(&dev
->se_port_lock
);
1677 spin_lock_init(&dev
->se_tmr_lock
);
1679 dev
->queue_depth
= dev_limits
->queue_depth
;
1680 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1681 atomic_set(&dev
->dev_ordered_id
, 0);
1683 se_dev_set_default_attribs(dev
, dev_limits
);
1685 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1686 dev
->creation_time
= get_jiffies_64();
1687 spin_lock_init(&dev
->stats_lock
);
1689 spin_lock(&hba
->device_lock
);
1690 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1692 spin_unlock(&hba
->device_lock
);
1694 * Setup the SAM Task Attribute emulation for struct se_device
1696 core_setup_task_attr_emulation(dev
);
1698 * Force PR and ALUA passthrough emulation with internal object use.
1700 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1702 * Setup the Reservations infrastructure for struct se_device
1704 core_setup_reservations(dev
, force_pt
);
1706 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1708 if (core_setup_alua(dev
, force_pt
) < 0)
1712 * Startup the struct se_device processing thread
1714 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1715 "LIO_%s", TRANSPORT(dev
)->name
);
1716 if (IS_ERR(dev
->process_thread
)) {
1717 printk(KERN_ERR
"Unable to create kthread: LIO_%s\n",
1718 TRANSPORT(dev
)->name
);
1723 * Preload the initial INQUIRY const values if we are doing
1724 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1725 * passthrough because this is being provided by the backend LLD.
1726 * This is required so that transport_get_inquiry() copies these
1727 * originals once back into DEV_T10_WWN(dev) for the virtual device
1730 if (TRANSPORT(dev
)->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1731 if (!(inquiry_prod
) || !(inquiry_prod
)) {
1732 printk(KERN_ERR
"All non TCM/pSCSI plugins require"
1733 " INQUIRY consts\n");
1737 strncpy(&DEV_T10_WWN(dev
)->vendor
[0], "LIO-ORG", 8);
1738 strncpy(&DEV_T10_WWN(dev
)->model
[0], inquiry_prod
, 16);
1739 strncpy(&DEV_T10_WWN(dev
)->revision
[0], inquiry_rev
, 4);
1741 scsi_dump_inquiry(dev
);
1746 kthread_stop(dev
->process_thread
);
1748 spin_lock(&hba
->device_lock
);
1749 list_del(&dev
->dev_list
);
1751 spin_unlock(&hba
->device_lock
);
1753 se_release_vpd_for_dev(dev
);
1755 kfree(dev
->dev_status_queue_obj
);
1756 kfree(dev
->dev_queue_obj
);
1761 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1763 /* transport_generic_prepare_cdb():
1765 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1766 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1767 * The point of this is since we are mapping iSCSI LUNs to
1768 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1769 * devices and HBAs for a loop.
1771 static inline void transport_generic_prepare_cdb(
1775 case READ_10
: /* SBC - RDProtect */
1776 case READ_12
: /* SBC - RDProtect */
1777 case READ_16
: /* SBC - RDProtect */
1778 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1779 case VERIFY
: /* SBC - VRProtect */
1780 case VERIFY_16
: /* SBC - VRProtect */
1781 case WRITE_VERIFY
: /* SBC - VRProtect */
1782 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1785 cdb
[1] &= 0x1f; /* clear logical unit number */
1790 static struct se_task
*
1791 transport_generic_get_task(struct se_cmd
*cmd
,
1792 enum dma_data_direction data_direction
)
1794 struct se_task
*task
;
1795 struct se_device
*dev
= SE_DEV(cmd
);
1796 unsigned long flags
;
1798 task
= dev
->transport
->alloc_task(cmd
);
1800 printk(KERN_ERR
"Unable to allocate struct se_task\n");
1804 INIT_LIST_HEAD(&task
->t_list
);
1805 INIT_LIST_HEAD(&task
->t_execute_list
);
1806 INIT_LIST_HEAD(&task
->t_state_list
);
1807 init_completion(&task
->task_stop_comp
);
1808 task
->task_no
= T_TASK(cmd
)->t_tasks_no
++;
1809 task
->task_se_cmd
= cmd
;
1811 task
->task_data_direction
= data_direction
;
1813 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
1814 list_add_tail(&task
->t_list
, &T_TASK(cmd
)->t_task_list
);
1815 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1820 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1822 void transport_device_setup_cmd(struct se_cmd
*cmd
)
1824 cmd
->se_dev
= SE_LUN(cmd
)->lun_se_dev
;
1826 EXPORT_SYMBOL(transport_device_setup_cmd
);
1829 * Used by fabric modules containing a local struct se_cmd within their
1830 * fabric dependent per I/O descriptor.
1832 void transport_init_se_cmd(
1834 struct target_core_fabric_ops
*tfo
,
1835 struct se_session
*se_sess
,
1839 unsigned char *sense_buffer
)
1841 INIT_LIST_HEAD(&cmd
->se_lun_list
);
1842 INIT_LIST_HEAD(&cmd
->se_delayed_list
);
1843 INIT_LIST_HEAD(&cmd
->se_ordered_list
);
1845 * Setup t_task pointer to t_task_backstore
1847 cmd
->t_task
= &cmd
->t_task_backstore
;
1849 INIT_LIST_HEAD(&T_TASK(cmd
)->t_task_list
);
1850 init_completion(&T_TASK(cmd
)->transport_lun_fe_stop_comp
);
1851 init_completion(&T_TASK(cmd
)->transport_lun_stop_comp
);
1852 init_completion(&T_TASK(cmd
)->t_transport_stop_comp
);
1853 spin_lock_init(&T_TASK(cmd
)->t_state_lock
);
1854 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 1);
1857 cmd
->se_sess
= se_sess
;
1858 cmd
->data_length
= data_length
;
1859 cmd
->data_direction
= data_direction
;
1860 cmd
->sam_task_attr
= task_attr
;
1861 cmd
->sense_buffer
= sense_buffer
;
1863 EXPORT_SYMBOL(transport_init_se_cmd
);
1865 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1868 * Check if SAM Task Attribute emulation is enabled for this
1869 * struct se_device storage object
1871 if (SE_DEV(cmd
)->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1874 if (cmd
->sam_task_attr
== TASK_ATTR_ACA
) {
1875 DEBUG_STA("SAM Task Attribute ACA"
1876 " emulation is not supported\n");
1880 * Used to determine when ORDERED commands should go from
1881 * Dormant to Active status.
1883 cmd
->se_ordered_id
= atomic_inc_return(&SE_DEV(cmd
)->dev_ordered_id
);
1884 smp_mb__after_atomic_inc();
1885 DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1886 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1887 TRANSPORT(cmd
->se_dev
)->name
);
1891 void transport_free_se_cmd(
1892 struct se_cmd
*se_cmd
)
1894 if (se_cmd
->se_tmr_req
)
1895 core_tmr_release_req(se_cmd
->se_tmr_req
);
1897 * Check and free any extended CDB buffer that was allocated
1899 if (T_TASK(se_cmd
)->t_task_cdb
!= T_TASK(se_cmd
)->__t_task_cdb
)
1900 kfree(T_TASK(se_cmd
)->t_task_cdb
);
1902 EXPORT_SYMBOL(transport_free_se_cmd
);
1904 static void transport_generic_wait_for_tasks(struct se_cmd
*, int, int);
1906 /* transport_generic_allocate_tasks():
1908 * Called from fabric RX Thread.
1910 int transport_generic_allocate_tasks(
1916 transport_generic_prepare_cdb(cdb
);
1919 * This is needed for early exceptions.
1921 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1923 transport_device_setup_cmd(cmd
);
1925 * Ensure that the received CDB is less than the max (252 + 8) bytes
1926 * for VARIABLE_LENGTH_CMD
1928 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1929 printk(KERN_ERR
"Received SCSI CDB with command_size: %d that"
1930 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1931 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1935 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1936 * allocate the additional extended CDB buffer now.. Otherwise
1937 * setup the pointer from __t_task_cdb to t_task_cdb.
1939 if (scsi_command_size(cdb
) > sizeof(T_TASK(cmd
)->__t_task_cdb
)) {
1940 T_TASK(cmd
)->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1942 if (!(T_TASK(cmd
)->t_task_cdb
)) {
1943 printk(KERN_ERR
"Unable to allocate T_TASK(cmd)->t_task_cdb"
1944 " %u > sizeof(T_TASK(cmd)->__t_task_cdb): %lu ops\n",
1945 scsi_command_size(cdb
),
1946 (unsigned long)sizeof(T_TASK(cmd
)->__t_task_cdb
));
1950 T_TASK(cmd
)->t_task_cdb
= &T_TASK(cmd
)->__t_task_cdb
[0];
1952 * Copy the original CDB into T_TASK(cmd).
1954 memcpy(T_TASK(cmd
)->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1956 * Setup the received CDB based on SCSI defined opcodes and
1957 * perform unit attention, persistent reservations and ALUA
1958 * checks for virtual device backends. The T_TASK(cmd)->t_task_cdb
1959 * pointer is expected to be setup before we reach this point.
1961 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1965 * Check for SAM Task Attribute Emulation
1967 if (transport_check_alloc_task_attr(cmd
) < 0) {
1968 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1969 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1972 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1973 if (cmd
->se_lun
->lun_sep
)
1974 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1975 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1978 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1981 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1982 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1984 int transport_generic_handle_cdb(
1989 printk(KERN_ERR
"SE_LUN(cmd) is NULL\n");
1993 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD
);
1996 EXPORT_SYMBOL(transport_generic_handle_cdb
);
1999 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
2000 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
2001 * complete setup in TCM process context w/ TFO->new_cmd_map().
2003 int transport_generic_handle_cdb_map(
2008 printk(KERN_ERR
"SE_LUN(cmd) is NULL\n");
2012 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
);
2015 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
2017 /* transport_generic_handle_data():
2021 int transport_generic_handle_data(
2025 * For the software fabric case, then we assume the nexus is being
2026 * failed/shutdown when signals are pending from the kthread context
2027 * caller, so we return a failure. For the HW target mode case running
2028 * in interrupt code, the signal_pending() check is skipped.
2030 if (!in_interrupt() && signal_pending(current
))
2033 * If the received CDB has aleady been ABORTED by the generic
2034 * target engine, we now call transport_check_aborted_status()
2035 * to queue any delated TASK_ABORTED status for the received CDB to the
2036 * fabric module as we are expecting no futher incoming DATA OUT
2037 * sequences at this point.
2039 if (transport_check_aborted_status(cmd
, 1) != 0)
2042 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
);
2045 EXPORT_SYMBOL(transport_generic_handle_data
);
2047 /* transport_generic_handle_tmr():
2051 int transport_generic_handle_tmr(
2055 * This is needed for early exceptions.
2057 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
2058 transport_device_setup_cmd(cmd
);
2060 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
);
2063 EXPORT_SYMBOL(transport_generic_handle_tmr
);
2065 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
2067 struct se_task
*task
, *task_tmp
;
2068 unsigned long flags
;
2071 DEBUG_TS("ITT[0x%08x] - Stopping tasks\n",
2072 CMD_TFO(cmd
)->get_task_tag(cmd
));
2075 * No tasks remain in the execution queue
2077 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2078 list_for_each_entry_safe(task
, task_tmp
,
2079 &T_TASK(cmd
)->t_task_list
, t_list
) {
2080 DEBUG_TS("task_no[%d] - Processing task %p\n",
2081 task
->task_no
, task
);
2083 * If the struct se_task has not been sent and is not active,
2084 * remove the struct se_task from the execution queue.
2086 if (!atomic_read(&task
->task_sent
) &&
2087 !atomic_read(&task
->task_active
)) {
2088 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
2090 transport_remove_task_from_execute_queue(task
,
2093 DEBUG_TS("task_no[%d] - Removed from execute queue\n",
2095 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2100 * If the struct se_task is active, sleep until it is returned
2103 if (atomic_read(&task
->task_active
)) {
2104 atomic_set(&task
->task_stop
, 1);
2105 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
2108 DEBUG_TS("task_no[%d] - Waiting to complete\n",
2110 wait_for_completion(&task
->task_stop_comp
);
2111 DEBUG_TS("task_no[%d] - Stopped successfully\n",
2114 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2115 atomic_dec(&T_TASK(cmd
)->t_task_cdbs_left
);
2117 atomic_set(&task
->task_active
, 0);
2118 atomic_set(&task
->task_stop
, 0);
2120 DEBUG_TS("task_no[%d] - Did nothing\n", task
->task_no
);
2124 __transport_stop_task_timer(task
, &flags
);
2126 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2131 static void transport_failure_reset_queue_depth(struct se_device
*dev
)
2133 unsigned long flags
;
2135 spin_lock_irqsave(&SE_HBA(dev
)->hba_queue_lock
, flags
);;
2136 atomic_inc(&dev
->depth_left
);
2137 atomic_inc(&SE_HBA(dev
)->left_queue_depth
);
2138 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2142 * Handle SAM-esque emulation for generic transport request failures.
2144 static void transport_generic_request_failure(
2146 struct se_device
*dev
,
2150 DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
2151 " CDB: 0x%02x\n", cmd
, CMD_TFO(cmd
)->get_task_tag(cmd
),
2152 T_TASK(cmd
)->t_task_cdb
[0]);
2153 DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:"
2154 " %d/%d transport_error_status: %d\n",
2155 CMD_TFO(cmd
)->get_cmd_state(cmd
),
2156 cmd
->t_state
, cmd
->deferred_t_state
,
2157 cmd
->transport_error_status
);
2158 DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d"
2159 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
2160 " t_transport_active: %d t_transport_stop: %d"
2161 " t_transport_sent: %d\n", T_TASK(cmd
)->t_task_cdbs
,
2162 atomic_read(&T_TASK(cmd
)->t_task_cdbs_left
),
2163 atomic_read(&T_TASK(cmd
)->t_task_cdbs_sent
),
2164 atomic_read(&T_TASK(cmd
)->t_task_cdbs_ex_left
),
2165 atomic_read(&T_TASK(cmd
)->t_transport_active
),
2166 atomic_read(&T_TASK(cmd
)->t_transport_stop
),
2167 atomic_read(&T_TASK(cmd
)->t_transport_sent
));
2169 transport_stop_all_task_timers(cmd
);
2172 transport_failure_reset_queue_depth(dev
);
2174 * For SAM Task Attribute emulation for failed struct se_cmd
2176 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2177 transport_complete_task_attr(cmd
);
2180 transport_direct_request_timeout(cmd
);
2181 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2184 switch (cmd
->transport_error_status
) {
2185 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
2186 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
2188 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
2189 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
2191 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
2192 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
2194 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
2195 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
2197 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
2199 transport_new_cmd_failure(cmd
);
2201 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2202 * we force this session to fall back to session
2205 CMD_TFO(cmd
)->fall_back_to_erl0(cmd
->se_sess
);
2206 CMD_TFO(cmd
)->stop_session(cmd
->se_sess
, 0, 0);
2209 case PYX_TRANSPORT_LU_COMM_FAILURE
:
2210 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
2211 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2213 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
2214 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
2216 case PYX_TRANSPORT_WRITE_PROTECTED
:
2217 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
2219 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
2221 * No SENSE Data payload for this case, set SCSI Status
2222 * and queue the response to $FABRIC_MOD.
2224 * Uses linux/include/scsi/scsi.h SAM status codes defs
2226 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2228 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2229 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2232 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2235 DEV_ATTRIB(cmd
->se_dev
)->emulate_ua_intlck_ctrl
== 2)
2236 core_scsi3_ua_allocate(SE_SESS(cmd
)->se_node_acl
,
2237 cmd
->orig_fe_lun
, 0x2C,
2238 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2240 CMD_TFO(cmd
)->queue_status(cmd
);
2242 case PYX_TRANSPORT_USE_SENSE_REASON
:
2244 * struct se_cmd->scsi_sense_reason already set
2248 printk(KERN_ERR
"Unknown transport error for CDB 0x%02x: %d\n",
2249 T_TASK(cmd
)->t_task_cdb
[0],
2250 cmd
->transport_error_status
);
2251 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
2256 transport_new_cmd_failure(cmd
);
2258 transport_send_check_condition_and_sense(cmd
,
2259 cmd
->scsi_sense_reason
, 0);
2261 transport_lun_remove_cmd(cmd
);
2262 if (!(transport_cmd_check_stop_to_fabric(cmd
)))
2266 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
2268 unsigned long flags
;
2270 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2271 if (!(atomic_read(&T_TASK(cmd
)->t_transport_timeout
))) {
2272 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2275 if (atomic_read(&T_TASK(cmd
)->t_task_cdbs_timeout_left
)) {
2276 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2280 atomic_sub(atomic_read(&T_TASK(cmd
)->t_transport_timeout
),
2281 &T_TASK(cmd
)->t_se_count
);
2282 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2285 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
2287 unsigned long flags
;
2290 * Reset T_TASK(cmd)->t_se_count to allow transport_generic_remove()
2291 * to allow last call to free memory resources.
2293 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2294 if (atomic_read(&T_TASK(cmd
)->t_transport_timeout
) > 1) {
2295 int tmp
= (atomic_read(&T_TASK(cmd
)->t_transport_timeout
) - 1);
2297 atomic_sub(tmp
, &T_TASK(cmd
)->t_se_count
);
2299 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2301 transport_generic_remove(cmd
, 0, 0);
2305 transport_generic_allocate_buf(struct se_cmd
*cmd
, u32 data_length
)
2309 buf
= kzalloc(data_length
, GFP_KERNEL
);
2311 printk(KERN_ERR
"Unable to allocate memory for buffer\n");
2315 T_TASK(cmd
)->t_tasks_se_num
= 0;
2316 T_TASK(cmd
)->t_task_buf
= buf
;
2321 static inline u32
transport_lba_21(unsigned char *cdb
)
2323 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2326 static inline u32
transport_lba_32(unsigned char *cdb
)
2328 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2331 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2333 unsigned int __v1
, __v2
;
2335 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2336 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2338 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2342 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2344 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2346 unsigned int __v1
, __v2
;
2348 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2349 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2351 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2354 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2356 unsigned long flags
;
2358 spin_lock_irqsave(&T_TASK(se_cmd
)->t_state_lock
, flags
);
2359 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2360 spin_unlock_irqrestore(&T_TASK(se_cmd
)->t_state_lock
, flags
);
2364 * Called from interrupt context.
2366 static void transport_task_timeout_handler(unsigned long data
)
2368 struct se_task
*task
= (struct se_task
*)data
;
2369 struct se_cmd
*cmd
= TASK_CMD(task
);
2370 unsigned long flags
;
2372 DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2374 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2375 if (task
->task_flags
& TF_STOP
) {
2376 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2379 task
->task_flags
&= ~TF_RUNNING
;
2382 * Determine if transport_complete_task() has already been called.
2384 if (!(atomic_read(&task
->task_active
))) {
2385 DEBUG_TT("transport task: %p cmd: %p timeout task_active"
2386 " == 0\n", task
, cmd
);
2387 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2391 atomic_inc(&T_TASK(cmd
)->t_se_count
);
2392 atomic_inc(&T_TASK(cmd
)->t_transport_timeout
);
2393 T_TASK(cmd
)->t_tasks_failed
= 1;
2395 atomic_set(&task
->task_timeout
, 1);
2396 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2397 task
->task_scsi_status
= 1;
2399 if (atomic_read(&task
->task_stop
)) {
2400 DEBUG_TT("transport task: %p cmd: %p timeout task_stop"
2401 " == 1\n", task
, cmd
);
2402 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2403 complete(&task
->task_stop_comp
);
2407 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_task_cdbs_left
))) {
2408 DEBUG_TT("transport task: %p cmd: %p timeout non zero"
2409 " t_task_cdbs_left\n", task
, cmd
);
2410 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2413 DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2416 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2417 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2419 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
);
2423 * Called with T_TASK(cmd)->t_state_lock held.
2425 static void transport_start_task_timer(struct se_task
*task
)
2427 struct se_device
*dev
= task
->se_dev
;
2430 if (task
->task_flags
& TF_RUNNING
)
2433 * If the task_timeout is disabled, exit now.
2435 timeout
= DEV_ATTRIB(dev
)->task_timeout
;
2439 init_timer(&task
->task_timer
);
2440 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2441 task
->task_timer
.data
= (unsigned long) task
;
2442 task
->task_timer
.function
= transport_task_timeout_handler
;
2444 task
->task_flags
|= TF_RUNNING
;
2445 add_timer(&task
->task_timer
);
2447 printk(KERN_INFO
"Starting task timer for cmd: %p task: %p seconds:"
2448 " %d\n", task
->task_se_cmd
, task
, timeout
);
2453 * Called with spin_lock_irq(&T_TASK(cmd)->t_state_lock) held.
2455 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2457 struct se_cmd
*cmd
= TASK_CMD(task
);
2459 if (!(task
->task_flags
& TF_RUNNING
))
2462 task
->task_flags
|= TF_STOP
;
2463 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, *flags
);
2465 del_timer_sync(&task
->task_timer
);
2467 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, *flags
);
2468 task
->task_flags
&= ~TF_RUNNING
;
2469 task
->task_flags
&= ~TF_STOP
;
2472 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2474 struct se_task
*task
= NULL
, *task_tmp
;
2475 unsigned long flags
;
2477 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2478 list_for_each_entry_safe(task
, task_tmp
,
2479 &T_TASK(cmd
)->t_task_list
, t_list
)
2480 __transport_stop_task_timer(task
, &flags
);
2481 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2484 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2486 if (dev
->dev_tcq_window_closed
++ <
2487 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2488 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2490 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2492 wake_up_interruptible(&dev
->dev_queue_obj
->thread_wq
);
2497 * Called from Fabric Module context from transport_execute_tasks()
2499 * The return of this function determins if the tasks from struct se_cmd
2500 * get added to the execution queue in transport_execute_tasks(),
2501 * or are added to the delayed or ordered lists here.
2503 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2505 if (SE_DEV(cmd
)->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2508 * Check for the existance of HEAD_OF_QUEUE, and if true return 1
2509 * to allow the passed struct se_cmd list of tasks to the front of the list.
2511 if (cmd
->sam_task_attr
== TASK_ATTR_HOQ
) {
2512 atomic_inc(&SE_DEV(cmd
)->dev_hoq_count
);
2513 smp_mb__after_atomic_inc();
2514 DEBUG_STA("Added HEAD_OF_QUEUE for CDB:"
2515 " 0x%02x, se_ordered_id: %u\n",
2516 T_TASK(cmd
)->t_task_cdb
[0],
2517 cmd
->se_ordered_id
);
2519 } else if (cmd
->sam_task_attr
== TASK_ATTR_ORDERED
) {
2520 spin_lock(&SE_DEV(cmd
)->ordered_cmd_lock
);
2521 list_add_tail(&cmd
->se_ordered_list
,
2522 &SE_DEV(cmd
)->ordered_cmd_list
);
2523 spin_unlock(&SE_DEV(cmd
)->ordered_cmd_lock
);
2525 atomic_inc(&SE_DEV(cmd
)->dev_ordered_sync
);
2526 smp_mb__after_atomic_inc();
2528 DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered"
2529 " list, se_ordered_id: %u\n",
2530 T_TASK(cmd
)->t_task_cdb
[0],
2531 cmd
->se_ordered_id
);
2533 * Add ORDERED command to tail of execution queue if
2534 * no other older commands exist that need to be
2537 if (!(atomic_read(&SE_DEV(cmd
)->simple_cmds
)))
2541 * For SIMPLE and UNTAGGED Task Attribute commands
2543 atomic_inc(&SE_DEV(cmd
)->simple_cmds
);
2544 smp_mb__after_atomic_inc();
2547 * Otherwise if one or more outstanding ORDERED task attribute exist,
2548 * add the dormant task(s) built for the passed struct se_cmd to the
2549 * execution queue and become in Active state for this struct se_device.
2551 if (atomic_read(&SE_DEV(cmd
)->dev_ordered_sync
) != 0) {
2553 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2554 * will be drained upon competion of HEAD_OF_QUEUE task.
2556 spin_lock(&SE_DEV(cmd
)->delayed_cmd_lock
);
2557 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2558 list_add_tail(&cmd
->se_delayed_list
,
2559 &SE_DEV(cmd
)->delayed_cmd_list
);
2560 spin_unlock(&SE_DEV(cmd
)->delayed_cmd_lock
);
2562 DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to"
2563 " delayed CMD list, se_ordered_id: %u\n",
2564 T_TASK(cmd
)->t_task_cdb
[0], cmd
->sam_task_attr
,
2565 cmd
->se_ordered_id
);
2567 * Return zero to let transport_execute_tasks() know
2568 * not to add the delayed tasks to the execution list.
2573 * Otherwise, no ORDERED task attributes exist..
2579 * Called from fabric module context in transport_generic_new_cmd() and
2580 * transport_generic_process_write()
2582 static int transport_execute_tasks(struct se_cmd
*cmd
)
2586 if (!(cmd
->se_cmd_flags
& SCF_SE_DISABLE_ONLINE_CHECK
)) {
2587 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2588 cmd
->transport_error_status
=
2589 PYX_TRANSPORT_LU_COMM_FAILURE
;
2590 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2595 * Call transport_cmd_check_stop() to see if a fabric exception
2596 * has occured that prevents execution.
2598 if (!(transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
))) {
2600 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2601 * attribute for the tasks of the received struct se_cmd CDB
2603 add_tasks
= transport_execute_task_attr(cmd
);
2607 * This calls transport_add_tasks_from_cmd() to handle
2608 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2609 * (if enabled) in __transport_add_task_to_execute_queue() and
2610 * transport_add_task_check_sam_attr().
2612 transport_add_tasks_from_cmd(cmd
);
2615 * Kick the execution queue for the cmd associated struct se_device
2619 __transport_execute_tasks(SE_DEV(cmd
));
2624 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2625 * from struct se_device->execute_task_list and
2627 * Called from transport_processing_thread()
2629 static int __transport_execute_tasks(struct se_device
*dev
)
2632 struct se_cmd
*cmd
= NULL
;
2633 struct se_task
*task
;
2634 unsigned long flags
;
2637 * Check if there is enough room in the device and HBA queue to send
2638 * struct se_transport_task's to the selected transport.
2641 spin_lock_irqsave(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2642 if (!(atomic_read(&dev
->depth_left
)) ||
2643 !(atomic_read(&SE_HBA(dev
)->left_queue_depth
))) {
2644 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2645 return transport_tcq_window_closed(dev
);
2647 dev
->dev_tcq_window_closed
= 0;
2649 spin_lock(&dev
->execute_task_lock
);
2650 task
= transport_get_task_from_execute_queue(dev
);
2651 spin_unlock(&dev
->execute_task_lock
);
2654 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2658 atomic_dec(&dev
->depth_left
);
2659 atomic_dec(&SE_HBA(dev
)->left_queue_depth
);
2660 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2662 cmd
= TASK_CMD(task
);
2664 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2665 atomic_set(&task
->task_active
, 1);
2666 atomic_set(&task
->task_sent
, 1);
2667 atomic_inc(&T_TASK(cmd
)->t_task_cdbs_sent
);
2669 if (atomic_read(&T_TASK(cmd
)->t_task_cdbs_sent
) ==
2670 T_TASK(cmd
)->t_task_cdbs
)
2671 atomic_set(&cmd
->transport_sent
, 1);
2673 transport_start_task_timer(task
);
2674 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2676 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2677 * to grab REPORT_LUNS CDBs before they hit the
2678 * struct se_subsystem_api->do_task() caller below.
2680 if (cmd
->transport_emulate_cdb
) {
2681 error
= cmd
->transport_emulate_cdb(cmd
);
2683 cmd
->transport_error_status
= error
;
2684 atomic_set(&task
->task_active
, 0);
2685 atomic_set(&cmd
->transport_sent
, 0);
2686 transport_stop_tasks_for_cmd(cmd
);
2687 transport_generic_request_failure(cmd
, dev
, 0, 1);
2691 * Handle the successful completion for transport_emulate_cdb()
2692 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2693 * Otherwise the caller is expected to complete the task with
2696 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2697 cmd
->scsi_status
= SAM_STAT_GOOD
;
2698 task
->task_scsi_status
= GOOD
;
2699 transport_complete_task(task
, 1);
2703 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2704 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2705 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2706 * LUN emulation code.
2708 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2709 * call ->do_task() directly and let the underlying TCM subsystem plugin
2710 * code handle the CDB emulation.
2712 if ((TRANSPORT(dev
)->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2713 (!(TASK_CMD(task
)->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2714 error
= transport_emulate_control_cdb(task
);
2716 error
= TRANSPORT(dev
)->do_task(task
);
2719 cmd
->transport_error_status
= error
;
2720 atomic_set(&task
->task_active
, 0);
2721 atomic_set(&cmd
->transport_sent
, 0);
2722 transport_stop_tasks_for_cmd(cmd
);
2723 transport_generic_request_failure(cmd
, dev
, 0, 1);
2732 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2734 unsigned long flags
;
2736 * Any unsolicited data will get dumped for failed command inside of
2739 spin_lock_irqsave(&T_TASK(se_cmd
)->t_state_lock
, flags
);
2740 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2741 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2742 spin_unlock_irqrestore(&T_TASK(se_cmd
)->t_state_lock
, flags
);
2744 CMD_TFO(se_cmd
)->new_cmd_failure(se_cmd
);
2747 static void transport_nop_wait_for_tasks(struct se_cmd
*, int, int);
2749 static inline u32
transport_get_sectors_6(
2754 struct se_device
*dev
= SE_LUN(cmd
)->lun_se_dev
;
2757 * Assume TYPE_DISK for non struct se_device objects.
2758 * Use 8-bit sector value.
2764 * Use 24-bit allocation length for TYPE_TAPE.
2766 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
)
2767 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2770 * Everything else assume TYPE_DISK Sector CDB location.
2771 * Use 8-bit sector value.
2777 static inline u32
transport_get_sectors_10(
2782 struct se_device
*dev
= SE_LUN(cmd
)->lun_se_dev
;
2785 * Assume TYPE_DISK for non struct se_device objects.
2786 * Use 16-bit sector value.
2792 * XXX_10 is not defined in SSC, throw an exception
2794 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
) {
2800 * Everything else assume TYPE_DISK Sector CDB location.
2801 * Use 16-bit sector value.
2804 return (u32
)(cdb
[7] << 8) + cdb
[8];
2807 static inline u32
transport_get_sectors_12(
2812 struct se_device
*dev
= SE_LUN(cmd
)->lun_se_dev
;
2815 * Assume TYPE_DISK for non struct se_device objects.
2816 * Use 32-bit sector value.
2822 * XXX_12 is not defined in SSC, throw an exception
2824 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
) {
2830 * Everything else assume TYPE_DISK Sector CDB location.
2831 * Use 32-bit sector value.
2834 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2837 static inline u32
transport_get_sectors_16(
2842 struct se_device
*dev
= SE_LUN(cmd
)->lun_se_dev
;
2845 * Assume TYPE_DISK for non struct se_device objects.
2846 * Use 32-bit sector value.
2852 * Use 24-bit allocation length for TYPE_TAPE.
2854 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
)
2855 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2858 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2859 (cdb
[12] << 8) + cdb
[13];
2863 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2865 static inline u32
transport_get_sectors_32(
2871 * Assume TYPE_DISK for non struct se_device objects.
2872 * Use 32-bit sector value.
2874 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2875 (cdb
[30] << 8) + cdb
[31];
2879 static inline u32
transport_get_size(
2884 struct se_device
*dev
= SE_DEV(cmd
);
2886 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
) {
2887 if (cdb
[1] & 1) { /* sectors */
2888 return DEV_ATTRIB(dev
)->block_size
* sectors
;
2893 printk(KERN_INFO
"Returning block_size: %u, sectors: %u == %u for"
2894 " %s object\n", DEV_ATTRIB(dev
)->block_size
, sectors
,
2895 DEV_ATTRIB(dev
)->block_size
* sectors
,
2896 TRANSPORT(dev
)->name
);
2898 return DEV_ATTRIB(dev
)->block_size
* sectors
;
2901 unsigned char transport_asciihex_to_binaryhex(unsigned char val
[2])
2903 unsigned char result
= 0;
2907 if ((val
[0] >= 'a') && (val
[0] <= 'f'))
2908 result
= ((val
[0] - 'a' + 10) & 0xf) << 4;
2910 if ((val
[0] >= 'A') && (val
[0] <= 'F'))
2911 result
= ((val
[0] - 'A' + 10) & 0xf) << 4;
2913 result
= ((val
[0] - '0') & 0xf) << 4;
2917 if ((val
[1] >= 'a') && (val
[1] <= 'f'))
2918 result
|= ((val
[1] - 'a' + 10) & 0xf);
2920 if ((val
[1] >= 'A') && (val
[1] <= 'F'))
2921 result
|= ((val
[1] - 'A' + 10) & 0xf);
2923 result
|= ((val
[1] - '0') & 0xf);
2927 EXPORT_SYMBOL(transport_asciihex_to_binaryhex
);
2929 static void transport_xor_callback(struct se_cmd
*cmd
)
2931 unsigned char *buf
, *addr
;
2932 struct se_mem
*se_mem
;
2933 unsigned int offset
;
2936 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2938 * 1) read the specified logical block(s);
2939 * 2) transfer logical blocks from the data-out buffer;
2940 * 3) XOR the logical blocks transferred from the data-out buffer with
2941 * the logical blocks read, storing the resulting XOR data in a buffer;
2942 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2943 * blocks transferred from the data-out buffer; and
2944 * 5) transfer the resulting XOR data to the data-in buffer.
2946 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2948 printk(KERN_ERR
"Unable to allocate xor_callback buf\n");
2952 * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list
2953 * into the locally allocated *buf
2955 transport_memcpy_se_mem_read_contig(cmd
, buf
, T_TASK(cmd
)->t_mem_list
);
2957 * Now perform the XOR against the BIDI read memory located at
2958 * T_TASK(cmd)->t_mem_bidi_list
2962 list_for_each_entry(se_mem
, T_TASK(cmd
)->t_mem_bidi_list
, se_list
) {
2963 addr
= (unsigned char *)kmap_atomic(se_mem
->se_page
, KM_USER0
);
2967 for (i
= 0; i
< se_mem
->se_len
; i
++)
2968 *(addr
+ se_mem
->se_off
+ i
) ^= *(buf
+ offset
+ i
);
2970 offset
+= se_mem
->se_len
;
2971 kunmap_atomic(addr
, KM_USER0
);
2978 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2980 static int transport_get_sense_data(struct se_cmd
*cmd
)
2982 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2983 struct se_device
*dev
;
2984 struct se_task
*task
= NULL
, *task_tmp
;
2985 unsigned long flags
;
2989 printk(KERN_ERR
"SE_LUN(cmd) is NULL\n");
2992 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2993 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2994 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2998 list_for_each_entry_safe(task
, task_tmp
,
2999 &T_TASK(cmd
)->t_task_list
, t_list
) {
3001 if (!task
->task_sense
)
3008 if (!TRANSPORT(dev
)->get_sense_buffer
) {
3009 printk(KERN_ERR
"TRANSPORT(dev)->get_sense_buffer"
3014 sense_buffer
= TRANSPORT(dev
)->get_sense_buffer(task
);
3015 if (!(sense_buffer
)) {
3016 printk(KERN_ERR
"ITT[0x%08x]_TASK[%d]: Unable to locate"
3017 " sense buffer for task with sense\n",
3018 CMD_TFO(cmd
)->get_task_tag(cmd
), task
->task_no
);
3021 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
3023 offset
= CMD_TFO(cmd
)->set_fabric_sense_len(cmd
,
3024 TRANSPORT_SENSE_BUFFER
);
3026 memcpy((void *)&buffer
[offset
], (void *)sense_buffer
,
3027 TRANSPORT_SENSE_BUFFER
);
3028 cmd
->scsi_status
= task
->task_scsi_status
;
3029 /* Automatically padded */
3030 cmd
->scsi_sense_length
=
3031 (TRANSPORT_SENSE_BUFFER
+ offset
);
3033 printk(KERN_INFO
"HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
3035 dev
->se_hba
->hba_id
, TRANSPORT(dev
)->name
,
3039 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
3044 static int transport_allocate_resources(struct se_cmd
*cmd
)
3046 u32 length
= cmd
->data_length
;
3048 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3049 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
))
3050 return transport_generic_get_mem(cmd
, length
, PAGE_SIZE
);
3051 else if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_NONSG_IO_CDB
)
3052 return transport_generic_allocate_buf(cmd
, length
);
3058 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
3060 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3061 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3062 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
3063 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
3065 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
3066 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
3069 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
3072 DEV_ATTRIB(cmd
->se_dev
)->emulate_ua_intlck_ctrl
== 2)
3073 core_scsi3_ua_allocate(SE_SESS(cmd
)->se_node_acl
,
3074 cmd
->orig_fe_lun
, 0x2C,
3075 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
3079 /* transport_generic_cmd_sequencer():
3081 * Generic Command Sequencer that should work for most DAS transport
3084 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
3087 * FIXME: Need to support other SCSI OPCODES where as well.
3089 static int transport_generic_cmd_sequencer(
3093 struct se_device
*dev
= SE_DEV(cmd
);
3094 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
3095 int ret
= 0, sector_ret
= 0, passthrough
;
3096 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
3100 * Check for an existing UNIT ATTENTION condition
3102 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
3103 cmd
->transport_wait_for_tasks
=
3104 &transport_nop_wait_for_tasks
;
3105 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3106 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
3110 * Check status of Asymmetric Logical Unit Assignment port
3112 ret
= T10_ALUA(su_dev
)->alua_state_check(cmd
, cdb
, &alua_ascq
);
3114 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3116 * Set SCSI additional sense code (ASC) to 'LUN Not Accessable';
3117 * The ALUA additional sense code qualifier (ASCQ) is determined
3118 * by the ALUA primary or secondary access state..
3122 printk(KERN_INFO
"[%s]: ALUA TG Port not available,"
3123 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
3124 CMD_TFO(cmd
)->get_fabric_name(), alua_ascq
);
3126 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
3127 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3128 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
3131 goto out_invalid_cdb_field
;
3134 * Check status for SPC-3 Persistent Reservations
3136 if (T10_PR_OPS(su_dev
)->t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
3137 if (T10_PR_OPS(su_dev
)->t10_seq_non_holder(
3138 cmd
, cdb
, pr_reg_type
) != 0)
3139 return transport_handle_reservation_conflict(cmd
);
3141 * This means the CDB is allowed for the SCSI Initiator port
3142 * when said port is *NOT* holding the legacy SPC-2 or
3143 * SPC-3 Persistent Reservation.
3149 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
3151 goto out_unsupported_cdb
;
3152 size
= transport_get_size(sectors
, cdb
, cmd
);
3153 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
3154 T_TASK(cmd
)->t_task_lba
= transport_lba_21(cdb
);
3155 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3158 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3160 goto out_unsupported_cdb
;
3161 size
= transport_get_size(sectors
, cdb
, cmd
);
3162 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
3163 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3164 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3167 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
3169 goto out_unsupported_cdb
;
3170 size
= transport_get_size(sectors
, cdb
, cmd
);
3171 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
3172 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3173 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3176 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3178 goto out_unsupported_cdb
;
3179 size
= transport_get_size(sectors
, cdb
, cmd
);
3180 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
3181 T_TASK(cmd
)->t_task_lba
= transport_lba_64(cdb
);
3182 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3185 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
3187 goto out_unsupported_cdb
;
3188 size
= transport_get_size(sectors
, cdb
, cmd
);
3189 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
3190 T_TASK(cmd
)->t_task_lba
= transport_lba_21(cdb
);
3191 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3194 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3196 goto out_unsupported_cdb
;
3197 size
= transport_get_size(sectors
, cdb
, cmd
);
3198 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
3199 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3200 T_TASK(cmd
)->t_tasks_fua
= (cdb
[1] & 0x8);
3201 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3204 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
3206 goto out_unsupported_cdb
;
3207 size
= transport_get_size(sectors
, cdb
, cmd
);
3208 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
3209 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3210 T_TASK(cmd
)->t_tasks_fua
= (cdb
[1] & 0x8);
3211 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3214 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3216 goto out_unsupported_cdb
;
3217 size
= transport_get_size(sectors
, cdb
, cmd
);
3218 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
3219 T_TASK(cmd
)->t_task_lba
= transport_lba_64(cdb
);
3220 T_TASK(cmd
)->t_tasks_fua
= (cdb
[1] & 0x8);
3221 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3223 case XDWRITEREAD_10
:
3224 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
3225 !(T_TASK(cmd
)->t_tasks_bidi
))
3226 goto out_invalid_cdb_field
;
3227 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3229 goto out_unsupported_cdb
;
3230 size
= transport_get_size(sectors
, cdb
, cmd
);
3231 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
3232 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3233 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3234 passthrough
= (TRANSPORT(dev
)->transport_type
==
3235 TRANSPORT_PLUGIN_PHBA_PDEV
);
3237 * Skip the remaining assignments for TCM/PSCSI passthrough
3242 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3244 cmd
->transport_complete_callback
= &transport_xor_callback
;
3245 T_TASK(cmd
)->t_tasks_fua
= (cdb
[1] & 0x8);
3247 case VARIABLE_LENGTH_CMD
:
3248 service_action
= get_unaligned_be16(&cdb
[8]);
3250 * Determine if this is TCM/PSCSI device and we should disable
3251 * internal emulation for this CDB.
3253 passthrough
= (TRANSPORT(dev
)->transport_type
==
3254 TRANSPORT_PLUGIN_PHBA_PDEV
);
3256 switch (service_action
) {
3257 case XDWRITEREAD_32
:
3258 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3260 goto out_unsupported_cdb
;
3261 size
= transport_get_size(sectors
, cdb
, cmd
);
3263 * Use WRITE_32 and READ_32 opcodes for the emulated
3264 * XDWRITE_READ_32 logic.
3266 cmd
->transport_split_cdb
= &split_cdb_XX_32
;
3267 T_TASK(cmd
)->t_task_lba
= transport_lba_64_ext(cdb
);
3268 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3271 * Skip the remaining assignments for TCM/PSCSI passthrough
3277 * Setup BIDI XOR callback to be run during
3278 * transport_generic_complete_ok()
3280 cmd
->transport_complete_callback
= &transport_xor_callback
;
3281 T_TASK(cmd
)->t_tasks_fua
= (cdb
[10] & 0x8);
3284 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3286 goto out_unsupported_cdb
;
3287 size
= transport_get_size(sectors
, cdb
, cmd
);
3288 T_TASK(cmd
)->t_task_lba
= get_unaligned_be64(&cdb
[12]);
3289 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3292 * Skip the remaining assignments for TCM/PSCSI passthrough
3297 if ((cdb
[10] & 0x04) || (cdb
[10] & 0x02)) {
3298 printk(KERN_ERR
"WRITE_SAME PBDATA and LBDATA"
3299 " bits not supported for Block Discard"
3301 goto out_invalid_cdb_field
;
3304 * Currently for the emulated case we only accept
3305 * tpws with the UNMAP=1 bit set.
3307 if (!(cdb
[10] & 0x08)) {
3308 printk(KERN_ERR
"WRITE_SAME w/o UNMAP bit not"
3309 " supported for Block Discard Emulation\n");
3310 goto out_invalid_cdb_field
;
3314 printk(KERN_ERR
"VARIABLE_LENGTH_CMD service action"
3315 " 0x%04x not supported\n", service_action
);
3316 goto out_unsupported_cdb
;
3320 if (TRANSPORT(dev
)->get_device_type(dev
) != TYPE_ROM
) {
3321 /* MAINTENANCE_IN from SCC-2 */
3323 * Check for emulated MI_REPORT_TARGET_PGS.
3325 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
3326 cmd
->transport_emulate_cdb
=
3327 (T10_ALUA(su_dev
)->alua_type
==
3328 SPC3_ALUA_EMULATED
) ?
3329 &core_emulate_report_target_port_groups
:
3332 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3333 (cdb
[8] << 8) | cdb
[9];
3335 /* GPCMD_SEND_KEY from multi media commands */
3336 size
= (cdb
[8] << 8) + cdb
[9];
3338 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3342 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3344 case MODE_SELECT_10
:
3345 size
= (cdb
[7] << 8) + cdb
[8];
3346 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3350 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3353 case GPCMD_READ_BUFFER_CAPACITY
:
3354 case GPCMD_SEND_OPC
:
3357 size
= (cdb
[7] << 8) + cdb
[8];
3358 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3360 case READ_BLOCK_LIMITS
:
3361 size
= READ_BLOCK_LEN
;
3362 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3364 case GPCMD_GET_CONFIGURATION
:
3365 case GPCMD_READ_FORMAT_CAPACITIES
:
3366 case GPCMD_READ_DISC_INFO
:
3367 case GPCMD_READ_TRACK_RZONE_INFO
:
3368 size
= (cdb
[7] << 8) + cdb
[8];
3369 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3371 case PERSISTENT_RESERVE_IN
:
3372 case PERSISTENT_RESERVE_OUT
:
3373 cmd
->transport_emulate_cdb
=
3374 (T10_RES(su_dev
)->res_type
==
3375 SPC3_PERSISTENT_RESERVATIONS
) ?
3376 &core_scsi3_emulate_pr
: NULL
;
3377 size
= (cdb
[7] << 8) + cdb
[8];
3378 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3380 case GPCMD_MECHANISM_STATUS
:
3381 case GPCMD_READ_DVD_STRUCTURE
:
3382 size
= (cdb
[8] << 8) + cdb
[9];
3383 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3386 size
= READ_POSITION_LEN
;
3387 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3390 if (TRANSPORT(dev
)->get_device_type(dev
) != TYPE_ROM
) {
3391 /* MAINTENANCE_OUT from SCC-2
3393 * Check for emulated MO_SET_TARGET_PGS.
3395 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3396 cmd
->transport_emulate_cdb
=
3397 (T10_ALUA(su_dev
)->alua_type
==
3398 SPC3_ALUA_EMULATED
) ?
3399 &core_emulate_set_target_port_groups
:
3403 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3404 (cdb
[8] << 8) | cdb
[9];
3406 /* GPCMD_REPORT_KEY from multi media commands */
3407 size
= (cdb
[8] << 8) + cdb
[9];
3409 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3412 size
= (cdb
[3] << 8) + cdb
[4];
3414 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3415 * See spc4r17 section 5.3
3417 if (SE_DEV(cmd
)->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3418 cmd
->sam_task_attr
= TASK_ATTR_HOQ
;
3419 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3422 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3423 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3426 size
= READ_CAP_LEN
;
3427 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3429 case READ_MEDIA_SERIAL_NUMBER
:
3430 case SECURITY_PROTOCOL_IN
:
3431 case SECURITY_PROTOCOL_OUT
:
3432 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3433 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3435 case SERVICE_ACTION_IN
:
3436 case ACCESS_CONTROL_IN
:
3437 case ACCESS_CONTROL_OUT
:
3439 case READ_ATTRIBUTE
:
3440 case RECEIVE_COPY_RESULTS
:
3441 case WRITE_ATTRIBUTE
:
3442 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3443 (cdb
[12] << 8) | cdb
[13];
3444 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3446 case RECEIVE_DIAGNOSTIC
:
3447 case SEND_DIAGNOSTIC
:
3448 size
= (cdb
[3] << 8) | cdb
[4];
3449 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3451 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3454 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3455 size
= (2336 * sectors
);
3456 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3461 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3465 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3467 case READ_ELEMENT_STATUS
:
3468 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3469 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3472 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3473 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3478 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3479 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3481 if (cdb
[0] == RESERVE_10
)
3482 size
= (cdb
[7] << 8) | cdb
[8];
3484 size
= cmd
->data_length
;
3487 * Setup the legacy emulated handler for SPC-2 and
3488 * >= SPC-3 compatible reservation handling (CRH=1)
3489 * Otherwise, we assume the underlying SCSI logic is
3490 * is running in SPC_PASSTHROUGH, and wants reservations
3491 * emulation disabled.
3493 cmd
->transport_emulate_cdb
=
3494 (T10_RES(su_dev
)->res_type
!=
3496 &core_scsi2_emulate_crh
: NULL
;
3497 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3502 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3503 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3505 if (cdb
[0] == RELEASE_10
)
3506 size
= (cdb
[7] << 8) | cdb
[8];
3508 size
= cmd
->data_length
;
3510 cmd
->transport_emulate_cdb
=
3511 (T10_RES(su_dev
)->res_type
!=
3513 &core_scsi2_emulate_crh
: NULL
;
3514 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3516 case SYNCHRONIZE_CACHE
:
3517 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3519 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3521 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3522 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3523 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3525 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3526 T_TASK(cmd
)->t_task_lba
= transport_lba_64(cdb
);
3529 goto out_unsupported_cdb
;
3531 size
= transport_get_size(sectors
, cdb
, cmd
);
3532 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3535 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3537 if (TRANSPORT(dev
)->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3540 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3541 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3543 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3545 * Check to ensure that LBA + Range does not exceed past end of
3548 if (transport_get_sectors(cmd
) < 0)
3549 goto out_invalid_cdb_field
;
3552 size
= get_unaligned_be16(&cdb
[7]);
3553 passthrough
= (TRANSPORT(dev
)->transport_type
==
3554 TRANSPORT_PLUGIN_PHBA_PDEV
);
3556 * Determine if the received UNMAP used to for direct passthrough
3557 * into Linux/SCSI with struct request via TCM/pSCSI or we are
3558 * signaling the use of internal transport_generic_unmap() emulation
3559 * for UNMAP -> Linux/BLOCK disbard with TCM/IBLOCK and TCM/FILEIO
3560 * subsystem plugin backstores.
3563 cmd
->se_cmd_flags
|= SCF_EMULATE_SYNC_UNMAP
;
3565 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3568 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3570 goto out_unsupported_cdb
;
3571 size
= transport_get_size(sectors
, cdb
, cmd
);
3572 T_TASK(cmd
)->t_task_lba
= get_unaligned_be16(&cdb
[2]);
3573 passthrough
= (TRANSPORT(dev
)->transport_type
==
3574 TRANSPORT_PLUGIN_PHBA_PDEV
);
3576 * Determine if the received WRITE_SAME_16 is used to for direct
3577 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3578 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3579 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3580 * TCM/FILEIO subsystem plugin backstores.
3582 if (!(passthrough
)) {
3583 if ((cdb
[1] & 0x04) || (cdb
[1] & 0x02)) {
3584 printk(KERN_ERR
"WRITE_SAME PBDATA and LBDATA"
3585 " bits not supported for Block Discard"
3587 goto out_invalid_cdb_field
;
3590 * Currently for the emulated case we only accept
3591 * tpws with the UNMAP=1 bit set.
3593 if (!(cdb
[1] & 0x08)) {
3594 printk(KERN_ERR
"WRITE_SAME w/o UNMAP bit not "
3595 " supported for Block Discard Emulation\n");
3596 goto out_invalid_cdb_field
;
3599 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3601 case ALLOW_MEDIUM_REMOVAL
:
3602 case GPCMD_CLOSE_TRACK
:
3604 case INITIALIZE_ELEMENT_STATUS
:
3605 case GPCMD_LOAD_UNLOAD
:
3608 case GPCMD_SET_SPEED
:
3611 case TEST_UNIT_READY
:
3613 case WRITE_FILEMARKS
:
3615 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3618 cmd
->transport_emulate_cdb
=
3619 &transport_core_report_lun_response
;
3620 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3622 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3623 * See spc4r17 section 5.3
3625 if (SE_DEV(cmd
)->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3626 cmd
->sam_task_attr
= TASK_ATTR_HOQ
;
3627 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3630 printk(KERN_WARNING
"TARGET_CORE[%s]: Unsupported SCSI Opcode"
3631 " 0x%02x, sending CHECK_CONDITION.\n",
3632 CMD_TFO(cmd
)->get_fabric_name(), cdb
[0]);
3633 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3634 goto out_unsupported_cdb
;
3637 if (size
!= cmd
->data_length
) {
3638 printk(KERN_WARNING
"TARGET_CORE[%s]: Expected Transfer Length:"
3639 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3640 " 0x%02x\n", CMD_TFO(cmd
)->get_fabric_name(),
3641 cmd
->data_length
, size
, cdb
[0]);
3643 cmd
->cmd_spdtl
= size
;
3645 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3646 printk(KERN_ERR
"Rejecting underflow/overflow"
3648 goto out_invalid_cdb_field
;
3651 * Reject READ_* or WRITE_* with overflow/underflow for
3652 * type SCF_SCSI_DATA_SG_IO_CDB.
3654 if (!(ret
) && (DEV_ATTRIB(dev
)->block_size
!= 512)) {
3655 printk(KERN_ERR
"Failing OVERFLOW/UNDERFLOW for LBA op"
3656 " CDB on non 512-byte sector setup subsystem"
3657 " plugin: %s\n", TRANSPORT(dev
)->name
);
3658 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3659 goto out_invalid_cdb_field
;
3662 if (size
> cmd
->data_length
) {
3663 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3664 cmd
->residual_count
= (size
- cmd
->data_length
);
3666 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3667 cmd
->residual_count
= (cmd
->data_length
- size
);
3669 cmd
->data_length
= size
;
3672 transport_set_supported_SAM_opcode(cmd
);
3675 out_unsupported_cdb
:
3676 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3677 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3679 out_invalid_cdb_field
:
3680 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3681 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3685 static inline void transport_release_tasks(struct se_cmd
*);
3688 * This function will copy a contiguous *src buffer into a destination
3689 * struct scatterlist array.
3691 static void transport_memcpy_write_contig(
3693 struct scatterlist
*sg_d
,
3696 u32 i
= 0, length
= 0, total_length
= cmd
->data_length
;
3699 while (total_length
) {
3700 length
= sg_d
[i
].length
;
3702 if (length
> total_length
)
3703 length
= total_length
;
3705 dst
= sg_virt(&sg_d
[i
]);
3707 memcpy(dst
, src
, length
);
3709 if (!(total_length
-= length
))
3718 * This function will copy a struct scatterlist array *sg_s into a destination
3719 * contiguous *dst buffer.
3721 static void transport_memcpy_read_contig(
3724 struct scatterlist
*sg_s
)
3726 u32 i
= 0, length
= 0, total_length
= cmd
->data_length
;
3729 while (total_length
) {
3730 length
= sg_s
[i
].length
;
3732 if (length
> total_length
)
3733 length
= total_length
;
3735 src
= sg_virt(&sg_s
[i
]);
3737 memcpy(dst
, src
, length
);
3739 if (!(total_length
-= length
))
3747 static void transport_memcpy_se_mem_read_contig(
3750 struct list_head
*se_mem_list
)
3752 struct se_mem
*se_mem
;
3754 u32 length
= 0, total_length
= cmd
->data_length
;
3756 list_for_each_entry(se_mem
, se_mem_list
, se_list
) {
3757 length
= se_mem
->se_len
;
3759 if (length
> total_length
)
3760 length
= total_length
;
3762 src
= page_address(se_mem
->se_page
) + se_mem
->se_off
;
3764 memcpy(dst
, src
, length
);
3766 if (!(total_length
-= length
))
3774 * Called from transport_generic_complete_ok() and
3775 * transport_generic_request_failure() to determine which dormant/delayed
3776 * and ordered cmds need to have their tasks added to the execution queue.
3778 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3780 struct se_device
*dev
= SE_DEV(cmd
);
3781 struct se_cmd
*cmd_p
, *cmd_tmp
;
3782 int new_active_tasks
= 0;
3784 if (cmd
->sam_task_attr
== TASK_ATTR_SIMPLE
) {
3785 atomic_dec(&dev
->simple_cmds
);
3786 smp_mb__after_atomic_dec();
3787 dev
->dev_cur_ordered_id
++;
3788 DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for"
3789 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3790 cmd
->se_ordered_id
);
3791 } else if (cmd
->sam_task_attr
== TASK_ATTR_HOQ
) {
3792 atomic_dec(&dev
->dev_hoq_count
);
3793 smp_mb__after_atomic_dec();
3794 dev
->dev_cur_ordered_id
++;
3795 DEBUG_STA("Incremented dev_cur_ordered_id: %u for"
3796 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3797 cmd
->se_ordered_id
);
3798 } else if (cmd
->sam_task_attr
== TASK_ATTR_ORDERED
) {
3799 spin_lock(&dev
->ordered_cmd_lock
);
3800 list_del(&cmd
->se_ordered_list
);
3801 atomic_dec(&dev
->dev_ordered_sync
);
3802 smp_mb__after_atomic_dec();
3803 spin_unlock(&dev
->ordered_cmd_lock
);
3805 dev
->dev_cur_ordered_id
++;
3806 DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:"
3807 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3810 * Process all commands up to the last received
3811 * ORDERED task attribute which requires another blocking
3814 spin_lock(&dev
->delayed_cmd_lock
);
3815 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3816 &dev
->delayed_cmd_list
, se_delayed_list
) {
3818 list_del(&cmd_p
->se_delayed_list
);
3819 spin_unlock(&dev
->delayed_cmd_lock
);
3821 DEBUG_STA("Calling add_tasks() for"
3822 " cmd_p: 0x%02x Task Attr: 0x%02x"
3823 " Dormant -> Active, se_ordered_id: %u\n",
3824 T_TASK(cmd_p
)->t_task_cdb
[0],
3825 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3827 transport_add_tasks_from_cmd(cmd_p
);
3830 spin_lock(&dev
->delayed_cmd_lock
);
3831 if (cmd_p
->sam_task_attr
== TASK_ATTR_ORDERED
)
3834 spin_unlock(&dev
->delayed_cmd_lock
);
3836 * If new tasks have become active, wake up the transport thread
3837 * to do the processing of the Active tasks.
3839 if (new_active_tasks
!= 0)
3840 wake_up_interruptible(&dev
->dev_queue_obj
->thread_wq
);
3843 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3847 * Check if we need to move delayed/dormant tasks from cmds on the
3848 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3851 if (SE_DEV(cmd
)->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3852 transport_complete_task_attr(cmd
);
3854 * Check if we need to retrieve a sense buffer from
3855 * the struct se_cmd in question.
3857 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3858 if (transport_get_sense_data(cmd
) < 0)
3859 reason
= TCM_NON_EXISTENT_LUN
;
3862 * Only set when an struct se_task->task_scsi_status returned
3863 * a non GOOD status.
3865 if (cmd
->scsi_status
) {
3866 transport_send_check_condition_and_sense(
3868 transport_lun_remove_cmd(cmd
);
3869 transport_cmd_check_stop_to_fabric(cmd
);
3874 * Check for a callback, used by amoungst other things
3875 * XDWRITE_READ_10 emulation.
3877 if (cmd
->transport_complete_callback
)
3878 cmd
->transport_complete_callback(cmd
);
3880 switch (cmd
->data_direction
) {
3881 case DMA_FROM_DEVICE
:
3882 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3883 if (SE_LUN(cmd
)->lun_sep
) {
3884 SE_LUN(cmd
)->lun_sep
->sep_stats
.tx_data_octets
+=
3887 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3889 * If enabled by TCM fabirc module pre-registered SGL
3890 * memory, perform the memcpy() from the TCM internal
3891 * contigious buffer back to the original SGL.
3893 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_CONTIG_TO_SG
)
3894 transport_memcpy_write_contig(cmd
,
3895 T_TASK(cmd
)->t_task_pt_sgl
,
3896 T_TASK(cmd
)->t_task_buf
);
3898 CMD_TFO(cmd
)->queue_data_in(cmd
);
3901 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3902 if (SE_LUN(cmd
)->lun_sep
) {
3903 SE_LUN(cmd
)->lun_sep
->sep_stats
.rx_data_octets
+=
3906 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3908 * Check if we need to send READ payload for BIDI-COMMAND
3910 if (T_TASK(cmd
)->t_mem_bidi_list
!= NULL
) {
3911 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3912 if (SE_LUN(cmd
)->lun_sep
) {
3913 SE_LUN(cmd
)->lun_sep
->sep_stats
.tx_data_octets
+=
3916 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3917 CMD_TFO(cmd
)->queue_data_in(cmd
);
3920 /* Fall through for DMA_TO_DEVICE */
3922 CMD_TFO(cmd
)->queue_status(cmd
);
3928 transport_lun_remove_cmd(cmd
);
3929 transport_cmd_check_stop_to_fabric(cmd
);
3932 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3934 struct se_task
*task
, *task_tmp
;
3935 unsigned long flags
;
3937 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
3938 list_for_each_entry_safe(task
, task_tmp
,
3939 &T_TASK(cmd
)->t_task_list
, t_list
) {
3940 if (atomic_read(&task
->task_active
))
3943 kfree(task
->task_sg_bidi
);
3944 kfree(task
->task_sg
);
3946 list_del(&task
->t_list
);
3948 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
3950 TRANSPORT(task
->se_dev
)->free_task(task
);
3952 printk(KERN_ERR
"task[%u] - task->se_dev is NULL\n",
3954 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
3956 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
3959 static inline void transport_free_pages(struct se_cmd
*cmd
)
3961 struct se_mem
*se_mem
, *se_mem_tmp
;
3964 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3966 if (cmd
->se_dev
->transport
->do_se_mem_map
)
3969 if (T_TASK(cmd
)->t_task_buf
) {
3970 kfree(T_TASK(cmd
)->t_task_buf
);
3971 T_TASK(cmd
)->t_task_buf
= NULL
;
3976 * Caller will handle releasing of struct se_mem.
3978 if (cmd
->se_cmd_flags
& SCF_CMD_PASSTHROUGH_NOALLOC
)
3981 if (!(T_TASK(cmd
)->t_tasks_se_num
))
3984 list_for_each_entry_safe(se_mem
, se_mem_tmp
,
3985 T_TASK(cmd
)->t_mem_list
, se_list
) {
3987 * We only release call __free_page(struct se_mem->se_page) when
3988 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3991 __free_page(se_mem
->se_page
);
3993 list_del(&se_mem
->se_list
);
3994 kmem_cache_free(se_mem_cache
, se_mem
);
3997 if (T_TASK(cmd
)->t_mem_bidi_list
&& T_TASK(cmd
)->t_tasks_se_bidi_num
) {
3998 list_for_each_entry_safe(se_mem
, se_mem_tmp
,
3999 T_TASK(cmd
)->t_mem_bidi_list
, se_list
) {
4001 * We only release call __free_page(struct se_mem->se_page) when
4002 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
4005 __free_page(se_mem
->se_page
);
4007 list_del(&se_mem
->se_list
);
4008 kmem_cache_free(se_mem_cache
, se_mem
);
4012 kfree(T_TASK(cmd
)->t_mem_bidi_list
);
4013 T_TASK(cmd
)->t_mem_bidi_list
= NULL
;
4014 kfree(T_TASK(cmd
)->t_mem_list
);
4015 T_TASK(cmd
)->t_mem_list
= NULL
;
4016 T_TASK(cmd
)->t_tasks_se_num
= 0;
4019 static inline void transport_release_tasks(struct se_cmd
*cmd
)
4021 transport_free_dev_tasks(cmd
);
4024 static inline int transport_dec_and_check(struct se_cmd
*cmd
)
4026 unsigned long flags
;
4028 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
4029 if (atomic_read(&T_TASK(cmd
)->t_fe_count
)) {
4030 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_fe_count
))) {
4031 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
4037 if (atomic_read(&T_TASK(cmd
)->t_se_count
)) {
4038 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_se_count
))) {
4039 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
4044 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4049 static void transport_release_fe_cmd(struct se_cmd
*cmd
)
4051 unsigned long flags
;
4053 if (transport_dec_and_check(cmd
))
4056 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
4057 if (!(atomic_read(&T_TASK(cmd
)->transport_dev_active
))) {
4058 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4061 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 0);
4062 transport_all_task_dev_remove_state(cmd
);
4063 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4065 transport_release_tasks(cmd
);
4067 transport_free_pages(cmd
);
4068 transport_free_se_cmd(cmd
);
4069 CMD_TFO(cmd
)->release_cmd_direct(cmd
);
4072 static int transport_generic_remove(
4074 int release_to_pool
,
4075 int session_reinstatement
)
4077 unsigned long flags
;
4082 if (transport_dec_and_check(cmd
)) {
4083 if (session_reinstatement
) {
4084 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
4085 transport_all_task_dev_remove_state(cmd
);
4086 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
4092 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
4093 if (!(atomic_read(&T_TASK(cmd
)->transport_dev_active
))) {
4094 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4097 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 0);
4098 transport_all_task_dev_remove_state(cmd
);
4099 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4101 transport_release_tasks(cmd
);
4103 transport_free_pages(cmd
);
4106 if (release_to_pool
) {
4107 transport_release_cmd_to_pool(cmd
);
4109 transport_free_se_cmd(cmd
);
4110 CMD_TFO(cmd
)->release_cmd_direct(cmd
);
4117 * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map
4118 * @cmd: Associated se_cmd descriptor
4119 * @mem: SGL style memory for TCM WRITE / READ
4120 * @sg_mem_num: Number of SGL elements
4121 * @mem_bidi_in: SGL style memory for TCM BIDI READ
4122 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
4124 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
4127 int transport_generic_map_mem_to_cmd(
4129 struct scatterlist
*mem
,
4131 struct scatterlist
*mem_bidi_in
,
4132 u32 sg_mem_bidi_num
)
4134 u32 se_mem_cnt_out
= 0;
4137 if (!(mem
) || !(sg_mem_num
))
4140 * Passed *mem will contain a list_head containing preformatted
4141 * struct se_mem elements...
4143 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM
)) {
4144 if ((mem_bidi_in
) || (sg_mem_bidi_num
)) {
4145 printk(KERN_ERR
"SCF_CMD_PASSTHROUGH_NOALLOC not supported"
4146 " with BIDI-COMMAND\n");
4150 T_TASK(cmd
)->t_mem_list
= (struct list_head
*)mem
;
4151 T_TASK(cmd
)->t_tasks_se_num
= sg_mem_num
;
4152 cmd
->se_cmd_flags
|= SCF_CMD_PASSTHROUGH_NOALLOC
;
4156 * Otherwise, assume the caller is passing a struct scatterlist
4157 * array from include/linux/scatterlist.h
4159 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
4160 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
4162 * For CDB using TCM struct se_mem linked list scatterlist memory
4163 * processed into a TCM struct se_subsystem_dev, we do the mapping
4164 * from the passed physical memory to struct se_mem->se_page here.
4166 T_TASK(cmd
)->t_mem_list
= transport_init_se_mem_list();
4167 if (!(T_TASK(cmd
)->t_mem_list
))
4170 ret
= transport_map_sg_to_mem(cmd
,
4171 T_TASK(cmd
)->t_mem_list
, mem
, &se_mem_cnt_out
);
4175 T_TASK(cmd
)->t_tasks_se_num
= se_mem_cnt_out
;
4177 * Setup BIDI READ list of struct se_mem elements
4179 if ((mem_bidi_in
) && (sg_mem_bidi_num
)) {
4180 T_TASK(cmd
)->t_mem_bidi_list
= transport_init_se_mem_list();
4181 if (!(T_TASK(cmd
)->t_mem_bidi_list
)) {
4182 kfree(T_TASK(cmd
)->t_mem_list
);
4187 ret
= transport_map_sg_to_mem(cmd
,
4188 T_TASK(cmd
)->t_mem_bidi_list
, mem_bidi_in
,
4191 kfree(T_TASK(cmd
)->t_mem_list
);
4195 T_TASK(cmd
)->t_tasks_se_bidi_num
= se_mem_cnt_out
;
4197 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
4199 } else if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_NONSG_IO_CDB
) {
4200 if (mem_bidi_in
|| sg_mem_bidi_num
) {
4201 printk(KERN_ERR
"BIDI-Commands not supported using "
4202 "SCF_SCSI_CONTROL_NONSG_IO_CDB\n");
4206 * For incoming CDBs using a contiguous buffer internall with TCM,
4207 * save the passed struct scatterlist memory. After TCM storage object
4208 * processing has completed for this struct se_cmd, TCM core will call
4209 * transport_memcpy_[write,read]_contig() as necessary from
4210 * transport_generic_complete_ok() and transport_write_pending() in order
4211 * to copy the TCM buffer to/from the original passed *mem in SGL ->
4212 * struct scatterlist format.
4214 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_CONTIG_TO_SG
;
4215 T_TASK(cmd
)->t_task_pt_sgl
= mem
;
4220 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
4223 static inline long long transport_dev_end_lba(struct se_device
*dev
)
4225 return dev
->transport
->get_blocks(dev
) + 1;
4228 static int transport_get_sectors(struct se_cmd
*cmd
)
4230 struct se_device
*dev
= SE_DEV(cmd
);
4232 T_TASK(cmd
)->t_tasks_sectors
=
4233 (cmd
->data_length
/ DEV_ATTRIB(dev
)->block_size
);
4234 if (!(T_TASK(cmd
)->t_tasks_sectors
))
4235 T_TASK(cmd
)->t_tasks_sectors
= 1;
4237 if (TRANSPORT(dev
)->get_device_type(dev
) != TYPE_DISK
)
4240 if ((T_TASK(cmd
)->t_task_lba
+ T_TASK(cmd
)->t_tasks_sectors
) >
4241 transport_dev_end_lba(dev
)) {
4242 printk(KERN_ERR
"LBA: %llu Sectors: %u exceeds"
4243 " transport_dev_end_lba(): %llu\n",
4244 T_TASK(cmd
)->t_task_lba
, T_TASK(cmd
)->t_tasks_sectors
,
4245 transport_dev_end_lba(dev
));
4246 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
4247 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
4248 return PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
;
4254 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
4256 struct se_device
*dev
= SE_DEV(cmd
);
4257 u32 task_cdbs
= 0, rc
;
4259 if (!(cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)) {
4261 T_TASK(cmd
)->t_task_cdbs
++;
4266 * Setup any BIDI READ tasks and memory from
4267 * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks
4268 * are queued first for the non pSCSI passthrough case.
4270 if ((T_TASK(cmd
)->t_mem_bidi_list
!= NULL
) &&
4271 (TRANSPORT(dev
)->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
4272 rc
= transport_generic_get_cdb_count(cmd
,
4273 T_TASK(cmd
)->t_task_lba
,
4274 T_TASK(cmd
)->t_tasks_sectors
,
4275 DMA_FROM_DEVICE
, T_TASK(cmd
)->t_mem_bidi_list
,
4278 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
4279 cmd
->scsi_sense_reason
=
4280 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
4281 return PYX_TRANSPORT_LU_COMM_FAILURE
;
4286 * Setup the tasks and memory from T_TASK(cmd)->t_mem_list
4287 * Note for BIDI transfers this will contain the WRITE payload
4289 task_cdbs
= transport_generic_get_cdb_count(cmd
,
4290 T_TASK(cmd
)->t_task_lba
,
4291 T_TASK(cmd
)->t_tasks_sectors
,
4292 cmd
->data_direction
, T_TASK(cmd
)->t_mem_list
,
4295 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
4296 cmd
->scsi_sense_reason
=
4297 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
4298 return PYX_TRANSPORT_LU_COMM_FAILURE
;
4300 T_TASK(cmd
)->t_task_cdbs
+= task_cdbs
;
4303 printk(KERN_INFO
"data_length: %u, LBA: %llu t_tasks_sectors:"
4304 " %u, t_task_cdbs: %u\n", obj_ptr
, cmd
->data_length
,
4305 T_TASK(cmd
)->t_task_lba
, T_TASK(cmd
)->t_tasks_sectors
,
4306 T_TASK(cmd
)->t_task_cdbs
);
4310 atomic_set(&T_TASK(cmd
)->t_task_cdbs_left
, task_cdbs
);
4311 atomic_set(&T_TASK(cmd
)->t_task_cdbs_ex_left
, task_cdbs
);
4312 atomic_set(&T_TASK(cmd
)->t_task_cdbs_timeout_left
, task_cdbs
);
4316 static struct list_head
*transport_init_se_mem_list(void)
4318 struct list_head
*se_mem_list
;
4320 se_mem_list
= kzalloc(sizeof(struct list_head
), GFP_KERNEL
);
4321 if (!(se_mem_list
)) {
4322 printk(KERN_ERR
"Unable to allocate memory for se_mem_list\n");
4325 INIT_LIST_HEAD(se_mem_list
);
4331 transport_generic_get_mem(struct se_cmd
*cmd
, u32 length
, u32 dma_size
)
4334 struct se_mem
*se_mem
;
4336 T_TASK(cmd
)->t_mem_list
= transport_init_se_mem_list();
4337 if (!(T_TASK(cmd
)->t_mem_list
))
4341 * If the device uses memory mapping this is enough.
4343 if (cmd
->se_dev
->transport
->do_se_mem_map
)
4347 * Setup BIDI-COMMAND READ list of struct se_mem elements
4349 if (T_TASK(cmd
)->t_tasks_bidi
) {
4350 T_TASK(cmd
)->t_mem_bidi_list
= transport_init_se_mem_list();
4351 if (!(T_TASK(cmd
)->t_mem_bidi_list
)) {
4352 kfree(T_TASK(cmd
)->t_mem_list
);
4358 se_mem
= kmem_cache_zalloc(se_mem_cache
, GFP_KERNEL
);
4360 printk(KERN_ERR
"Unable to allocate struct se_mem\n");
4363 INIT_LIST_HEAD(&se_mem
->se_list
);
4364 se_mem
->se_len
= (length
> dma_size
) ? dma_size
: length
;
4366 /* #warning FIXME Allocate contigous pages for struct se_mem elements */
4367 se_mem
->se_page
= (struct page
*) alloc_pages(GFP_KERNEL
, 0);
4368 if (!(se_mem
->se_page
)) {
4369 printk(KERN_ERR
"alloc_pages() failed\n");
4373 buf
= kmap_atomic(se_mem
->se_page
, KM_IRQ0
);
4375 printk(KERN_ERR
"kmap_atomic() failed\n");
4378 memset(buf
, 0, se_mem
->se_len
);
4379 kunmap_atomic(buf
, KM_IRQ0
);
4381 list_add_tail(&se_mem
->se_list
, T_TASK(cmd
)->t_mem_list
);
4382 T_TASK(cmd
)->t_tasks_se_num
++;
4384 DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)"
4385 " Offset(%u)\n", se_mem
->se_page
, se_mem
->se_len
,
4388 length
-= se_mem
->se_len
;
4391 DEBUG_MEM("Allocated total struct se_mem elements(%u)\n",
4392 T_TASK(cmd
)->t_tasks_se_num
);
4399 extern u32
transport_calc_sg_num(
4400 struct se_task
*task
,
4401 struct se_mem
*in_se_mem
,
4404 struct se_cmd
*se_cmd
= task
->task_se_cmd
;
4405 struct se_device
*se_dev
= SE_DEV(se_cmd
);
4406 struct se_mem
*se_mem
= in_se_mem
;
4407 struct target_core_fabric_ops
*tfo
= CMD_TFO(se_cmd
);
4408 u32 sg_length
, task_size
= task
->task_size
, task_sg_num_padded
;
4410 while (task_size
!= 0) {
4411 DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)"
4412 " se_mem->se_off(%u) task_offset(%u)\n",
4413 se_mem
->se_page
, se_mem
->se_len
,
4414 se_mem
->se_off
, task_offset
);
4416 if (task_offset
== 0) {
4417 if (task_size
>= se_mem
->se_len
) {
4418 sg_length
= se_mem
->se_len
;
4420 if (!(list_is_last(&se_mem
->se_list
,
4421 T_TASK(se_cmd
)->t_mem_list
)))
4422 se_mem
= list_entry(se_mem
->se_list
.next
,
4423 struct se_mem
, se_list
);
4425 sg_length
= task_size
;
4426 task_size
-= sg_length
;
4430 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4431 sg_length
, task_size
);
4433 if ((se_mem
->se_len
- task_offset
) > task_size
) {
4434 sg_length
= task_size
;
4435 task_size
-= sg_length
;
4438 sg_length
= (se_mem
->se_len
- task_offset
);
4440 if (!(list_is_last(&se_mem
->se_list
,
4441 T_TASK(se_cmd
)->t_mem_list
)))
4442 se_mem
= list_entry(se_mem
->se_list
.next
,
4443 struct se_mem
, se_list
);
4446 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4447 sg_length
, task_size
);
4451 task_size
-= sg_length
;
4453 DEBUG_SC("task[%u] - Reducing task_size to(%u)\n",
4454 task
->task_no
, task_size
);
4456 task
->task_sg_num
++;
4459 * Check if the fabric module driver is requesting that all
4460 * struct se_task->task_sg[] be chained together.. If so,
4461 * then allocate an extra padding SG entry for linking and
4462 * marking the end of the chained SGL.
4464 if (tfo
->task_sg_chaining
) {
4465 task_sg_num_padded
= (task
->task_sg_num
+ 1);
4466 task
->task_padded_sg
= 1;
4468 task_sg_num_padded
= task
->task_sg_num
;
4470 task
->task_sg
= kzalloc(task_sg_num_padded
*
4471 sizeof(struct scatterlist
), GFP_KERNEL
);
4472 if (!(task
->task_sg
)) {
4473 printk(KERN_ERR
"Unable to allocate memory for"
4474 " task->task_sg\n");
4477 sg_init_table(&task
->task_sg
[0], task_sg_num_padded
);
4479 * Setup task->task_sg_bidi for SCSI READ payload for
4480 * TCM/pSCSI passthrough if present for BIDI-COMMAND
4482 if ((T_TASK(se_cmd
)->t_mem_bidi_list
!= NULL
) &&
4483 (TRANSPORT(se_dev
)->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)) {
4484 task
->task_sg_bidi
= kzalloc(task_sg_num_padded
*
4485 sizeof(struct scatterlist
), GFP_KERNEL
);
4486 if (!(task
->task_sg_bidi
)) {
4487 printk(KERN_ERR
"Unable to allocate memory for"
4488 " task->task_sg_bidi\n");
4491 sg_init_table(&task
->task_sg_bidi
[0], task_sg_num_padded
);
4494 * For the chaining case, setup the proper end of SGL for the
4495 * initial submission struct task into struct se_subsystem_api.
4496 * This will be cleared later by transport_do_task_sg_chain()
4498 if (task
->task_padded_sg
) {
4499 sg_mark_end(&task
->task_sg
[task
->task_sg_num
- 1]);
4501 * Added the 'if' check before marking end of bi-directional
4502 * scatterlist (which gets created only in case of request
4505 if (task
->task_sg_bidi
)
4506 sg_mark_end(&task
->task_sg_bidi
[task
->task_sg_num
- 1]);
4509 DEBUG_SC("Successfully allocated task->task_sg_num(%u),"
4510 " task_sg_num_padded(%u)\n", task
->task_sg_num
,
4511 task_sg_num_padded
);
4513 return task
->task_sg_num
;
4516 static inline int transport_set_tasks_sectors_disk(
4517 struct se_task
*task
,
4518 struct se_device
*dev
,
4519 unsigned long long lba
,
4521 int *max_sectors_set
)
4523 if ((lba
+ sectors
) > transport_dev_end_lba(dev
)) {
4524 task
->task_sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
4526 if (task
->task_sectors
> DEV_ATTRIB(dev
)->max_sectors
) {
4527 task
->task_sectors
= DEV_ATTRIB(dev
)->max_sectors
;
4528 *max_sectors_set
= 1;
4531 if (sectors
> DEV_ATTRIB(dev
)->max_sectors
) {
4532 task
->task_sectors
= DEV_ATTRIB(dev
)->max_sectors
;
4533 *max_sectors_set
= 1;
4535 task
->task_sectors
= sectors
;
4541 static inline int transport_set_tasks_sectors_non_disk(
4542 struct se_task
*task
,
4543 struct se_device
*dev
,
4544 unsigned long long lba
,
4546 int *max_sectors_set
)
4548 if (sectors
> DEV_ATTRIB(dev
)->max_sectors
) {
4549 task
->task_sectors
= DEV_ATTRIB(dev
)->max_sectors
;
4550 *max_sectors_set
= 1;
4552 task
->task_sectors
= sectors
;
4557 static inline int transport_set_tasks_sectors(
4558 struct se_task
*task
,
4559 struct se_device
*dev
,
4560 unsigned long long lba
,
4562 int *max_sectors_set
)
4564 return (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_DISK
) ?
4565 transport_set_tasks_sectors_disk(task
, dev
, lba
, sectors
,
4567 transport_set_tasks_sectors_non_disk(task
, dev
, lba
, sectors
,
4571 static int transport_map_sg_to_mem(
4573 struct list_head
*se_mem_list
,
4577 struct se_mem
*se_mem
;
4578 struct scatterlist
*sg
;
4579 u32 sg_count
= 1, cmd_size
= cmd
->data_length
;
4582 printk(KERN_ERR
"No source scatterlist\n");
4585 sg
= (struct scatterlist
*)in_mem
;
4588 se_mem
= kmem_cache_zalloc(se_mem_cache
, GFP_KERNEL
);
4590 printk(KERN_ERR
"Unable to allocate struct se_mem\n");
4593 INIT_LIST_HEAD(&se_mem
->se_list
);
4594 DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u"
4595 " sg_page: %p offset: %d length: %d\n", cmd_size
,
4596 sg_page(sg
), sg
->offset
, sg
->length
);
4598 se_mem
->se_page
= sg_page(sg
);
4599 se_mem
->se_off
= sg
->offset
;
4601 if (cmd_size
> sg
->length
) {
4602 se_mem
->se_len
= sg
->length
;
4606 se_mem
->se_len
= cmd_size
;
4608 cmd_size
-= se_mem
->se_len
;
4610 DEBUG_MEM("sg_to_mem: *se_mem_cnt: %u cmd_size: %u\n",
4611 *se_mem_cnt
, cmd_size
);
4612 DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n",
4613 se_mem
->se_page
, se_mem
->se_off
, se_mem
->se_len
);
4615 list_add_tail(&se_mem
->se_list
, se_mem_list
);
4619 DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments to(%u)"
4620 " struct se_mem\n", sg_count
, *se_mem_cnt
);
4622 if (sg_count
!= *se_mem_cnt
)
4628 /* transport_map_mem_to_sg():
4632 int transport_map_mem_to_sg(
4633 struct se_task
*task
,
4634 struct list_head
*se_mem_list
,
4636 struct se_mem
*in_se_mem
,
4637 struct se_mem
**out_se_mem
,
4641 struct se_cmd
*se_cmd
= task
->task_se_cmd
;
4642 struct se_mem
*se_mem
= in_se_mem
;
4643 struct scatterlist
*sg
= (struct scatterlist
*)in_mem
;
4644 u32 task_size
= task
->task_size
, sg_no
= 0;
4647 printk(KERN_ERR
"Unable to locate valid struct"
4648 " scatterlist pointer\n");
4652 while (task_size
!= 0) {
4654 * Setup the contigious array of scatterlists for
4655 * this struct se_task.
4657 sg_assign_page(sg
, se_mem
->se_page
);
4659 if (*task_offset
== 0) {
4660 sg
->offset
= se_mem
->se_off
;
4662 if (task_size
>= se_mem
->se_len
) {
4663 sg
->length
= se_mem
->se_len
;
4665 if (!(list_is_last(&se_mem
->se_list
,
4666 T_TASK(se_cmd
)->t_mem_list
))) {
4667 se_mem
= list_entry(se_mem
->se_list
.next
,
4668 struct se_mem
, se_list
);
4672 sg
->length
= task_size
;
4674 * Determine if we need to calculate an offset
4675 * into the struct se_mem on the next go around..
4677 task_size
-= sg
->length
;
4679 *task_offset
= sg
->length
;
4685 sg
->offset
= (*task_offset
+ se_mem
->se_off
);
4687 if ((se_mem
->se_len
- *task_offset
) > task_size
) {
4688 sg
->length
= task_size
;
4690 * Determine if we need to calculate an offset
4691 * into the struct se_mem on the next go around..
4693 task_size
-= sg
->length
;
4695 *task_offset
+= sg
->length
;
4699 sg
->length
= (se_mem
->se_len
- *task_offset
);
4701 if (!(list_is_last(&se_mem
->se_list
,
4702 T_TASK(se_cmd
)->t_mem_list
))) {
4703 se_mem
= list_entry(se_mem
->se_list
.next
,
4704 struct se_mem
, se_list
);
4711 task_size
-= sg
->length
;
4713 DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing"
4714 " task_size to(%u), task_offset: %u\n", task
->task_no
, sg_no
,
4715 sg_page(sg
), sg
->length
, sg
->offset
, task_size
, *task_offset
);
4723 if (task_size
> se_cmd
->data_length
)
4726 *out_se_mem
= se_mem
;
4728 DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)"
4729 " SGs\n", task
->task_no
, *se_mem_cnt
, sg_no
);
4735 * This function can be used by HW target mode drivers to create a linked
4736 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4737 * This is intended to be called during the completion path by TCM Core
4738 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4740 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
4742 struct scatterlist
*sg_head
= NULL
, *sg_link
= NULL
, *sg_first
= NULL
;
4743 struct scatterlist
*sg_head_cur
= NULL
, *sg_link_cur
= NULL
;
4744 struct scatterlist
*sg
, *sg_end
= NULL
, *sg_end_cur
= NULL
;
4745 struct se_task
*task
;
4746 struct target_core_fabric_ops
*tfo
= CMD_TFO(cmd
);
4747 u32 task_sg_num
= 0, sg_count
= 0;
4750 if (tfo
->task_sg_chaining
== 0) {
4751 printk(KERN_ERR
"task_sg_chaining is diabled for fabric module:"
4752 " %s\n", tfo
->get_fabric_name());
4757 * Walk the struct se_task list and setup scatterlist chains
4758 * for each contiguosly allocated struct se_task->task_sg[].
4760 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
4761 if (!(task
->task_sg
) || !(task
->task_padded_sg
))
4764 if (sg_head
&& sg_link
) {
4765 sg_head_cur
= &task
->task_sg
[0];
4766 sg_link_cur
= &task
->task_sg
[task
->task_sg_num
];
4768 * Either add chain or mark end of scatterlist
4770 if (!(list_is_last(&task
->t_list
,
4771 &T_TASK(cmd
)->t_task_list
))) {
4773 * Clear existing SGL termination bit set in
4774 * transport_calc_sg_num(), see sg_mark_end()
4776 sg_end_cur
= &task
->task_sg
[task
->task_sg_num
- 1];
4777 sg_end_cur
->page_link
&= ~0x02;
4779 sg_chain(sg_head
, task_sg_num
, sg_head_cur
);
4780 sg_count
+= (task
->task_sg_num
+ 1);
4782 sg_count
+= task
->task_sg_num
;
4784 sg_head
= sg_head_cur
;
4785 sg_link
= sg_link_cur
;
4786 task_sg_num
= task
->task_sg_num
;
4789 sg_head
= sg_first
= &task
->task_sg
[0];
4790 sg_link
= &task
->task_sg
[task
->task_sg_num
];
4791 task_sg_num
= task
->task_sg_num
;
4793 * Check for single task..
4795 if (!(list_is_last(&task
->t_list
, &T_TASK(cmd
)->t_task_list
))) {
4797 * Clear existing SGL termination bit set in
4798 * transport_calc_sg_num(), see sg_mark_end()
4800 sg_end
= &task
->task_sg
[task
->task_sg_num
- 1];
4801 sg_end
->page_link
&= ~0x02;
4802 sg_count
+= (task
->task_sg_num
+ 1);
4804 sg_count
+= task
->task_sg_num
;
4807 * Setup the starting pointer and total t_tasks_sg_linked_no including
4808 * padding SGs for linking and to mark the end.
4810 T_TASK(cmd
)->t_tasks_sg_chained
= sg_first
;
4811 T_TASK(cmd
)->t_tasks_sg_chained_no
= sg_count
;
4813 DEBUG_CMD_M("Setup T_TASK(cmd)->t_tasks_sg_chained: %p and"
4814 " t_tasks_sg_chained_no: %u\n", T_TASK(cmd
)->t_tasks_sg_chained
,
4815 T_TASK(cmd
)->t_tasks_sg_chained_no
);
4817 for_each_sg(T_TASK(cmd
)->t_tasks_sg_chained
, sg
,
4818 T_TASK(cmd
)->t_tasks_sg_chained_no
, i
) {
4820 DEBUG_CMD_M("SG: %p page: %p length: %d offset: %d\n",
4821 sg
, sg_page(sg
), sg
->length
, sg
->offset
);
4822 if (sg_is_chain(sg
))
4823 DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg
);
4825 DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg
);
4829 EXPORT_SYMBOL(transport_do_task_sg_chain
);
4831 static int transport_do_se_mem_map(
4832 struct se_device
*dev
,
4833 struct se_task
*task
,
4834 struct list_head
*se_mem_list
,
4836 struct se_mem
*in_se_mem
,
4837 struct se_mem
**out_se_mem
,
4839 u32
*task_offset_in
)
4841 u32 task_offset
= *task_offset_in
;
4844 * se_subsystem_api_t->do_se_mem_map is used when internal allocation
4845 * has been done by the transport plugin.
4847 if (TRANSPORT(dev
)->do_se_mem_map
) {
4848 ret
= TRANSPORT(dev
)->do_se_mem_map(task
, se_mem_list
,
4849 in_mem
, in_se_mem
, out_se_mem
, se_mem_cnt
,
4852 T_TASK(task
->task_se_cmd
)->t_tasks_se_num
+= *se_mem_cnt
;
4857 BUG_ON(list_empty(se_mem_list
));
4859 * This is the normal path for all normal non BIDI and BIDI-COMMAND
4860 * WRITE payloads.. If we need to do BIDI READ passthrough for
4861 * TCM/pSCSI the first call to transport_do_se_mem_map ->
4862 * transport_calc_sg_num() -> transport_map_mem_to_sg() will do the
4863 * allocation for task->task_sg_bidi, and the subsequent call to
4864 * transport_do_se_mem_map() from transport_generic_get_cdb_count()
4866 if (!(task
->task_sg_bidi
)) {
4868 * Assume default that transport plugin speaks preallocated
4871 if (!(transport_calc_sg_num(task
, in_se_mem
, task_offset
)))
4874 * struct se_task->task_sg now contains the struct scatterlist array.
4876 return transport_map_mem_to_sg(task
, se_mem_list
, task
->task_sg
,
4877 in_se_mem
, out_se_mem
, se_mem_cnt
,
4881 * Handle the se_mem_list -> struct task->task_sg_bidi
4882 * memory map for the extra BIDI READ payload
4884 return transport_map_mem_to_sg(task
, se_mem_list
, task
->task_sg_bidi
,
4885 in_se_mem
, out_se_mem
, se_mem_cnt
,
4889 static u32
transport_generic_get_cdb_count(
4891 unsigned long long lba
,
4893 enum dma_data_direction data_direction
,
4894 struct list_head
*mem_list
,
4897 unsigned char *cdb
= NULL
;
4898 struct se_task
*task
;
4899 struct se_mem
*se_mem
= NULL
, *se_mem_lout
= NULL
;
4900 struct se_mem
*se_mem_bidi
= NULL
, *se_mem_bidi_lout
= NULL
;
4901 struct se_device
*dev
= SE_DEV(cmd
);
4902 int max_sectors_set
= 0, ret
;
4903 u32 task_offset_in
= 0, se_mem_cnt
= 0, se_mem_bidi_cnt
= 0, task_cdbs
= 0;
4906 printk(KERN_ERR
"mem_list is NULL in transport_generic_get"
4911 * While using RAMDISK_DR backstores is the only case where
4912 * mem_list will ever be empty at this point.
4914 if (!(list_empty(mem_list
)))
4915 se_mem
= list_entry(mem_list
->next
, struct se_mem
, se_list
);
4917 * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to
4918 * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation
4920 if ((T_TASK(cmd
)->t_mem_bidi_list
!= NULL
) &&
4921 !(list_empty(T_TASK(cmd
)->t_mem_bidi_list
)) &&
4922 (TRANSPORT(dev
)->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
))
4923 se_mem_bidi
= list_entry(T_TASK(cmd
)->t_mem_bidi_list
->next
,
4924 struct se_mem
, se_list
);
4927 DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n",
4928 CMD_TFO(cmd
)->get_task_tag(cmd
), lba
, sectors
,
4929 transport_dev_end_lba(dev
));
4931 task
= transport_generic_get_task(cmd
, data_direction
);
4935 transport_set_tasks_sectors(task
, dev
, lba
, sectors
,
4938 task
->task_lba
= lba
;
4939 lba
+= task
->task_sectors
;
4940 sectors
-= task
->task_sectors
;
4941 task
->task_size
= (task
->task_sectors
*
4942 DEV_ATTRIB(dev
)->block_size
);
4944 cdb
= TRANSPORT(dev
)->get_cdb(task
);
4946 memcpy(cdb
, T_TASK(cmd
)->t_task_cdb
,
4947 scsi_command_size(T_TASK(cmd
)->t_task_cdb
));
4948 cmd
->transport_split_cdb(task
->task_lba
,
4949 &task
->task_sectors
, cdb
);
4953 * Perform the SE OBJ plugin and/or Transport plugin specific
4954 * mapping for T_TASK(cmd)->t_mem_list. And setup the
4955 * task->task_sg and if necessary task->task_sg_bidi
4957 ret
= transport_do_se_mem_map(dev
, task
, mem_list
,
4958 NULL
, se_mem
, &se_mem_lout
, &se_mem_cnt
,
4963 se_mem
= se_mem_lout
;
4965 * Setup the T_TASK(cmd)->t_mem_bidi_list -> task->task_sg_bidi
4966 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI
4968 * Note that the first call to transport_do_se_mem_map() above will
4969 * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map()
4970 * -> transport_calc_sg_num(), and the second here will do the
4971 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI.
4973 if (task
->task_sg_bidi
!= NULL
) {
4974 ret
= transport_do_se_mem_map(dev
, task
,
4975 T_TASK(cmd
)->t_mem_bidi_list
, NULL
,
4976 se_mem_bidi
, &se_mem_bidi_lout
, &se_mem_bidi_cnt
,
4981 se_mem_bidi
= se_mem_bidi_lout
;
4985 DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
4986 task_cdbs
, task
->task_sg_num
);
4988 if (max_sectors_set
) {
4989 max_sectors_set
= 0;
4998 atomic_inc(&T_TASK(cmd
)->t_fe_count
);
4999 atomic_inc(&T_TASK(cmd
)->t_se_count
);
5002 DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
5003 CMD_TFO(cmd
)->get_task_tag(cmd
), (data_direction
== DMA_TO_DEVICE
)
5004 ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs
);
5012 transport_map_control_cmd_to_task(struct se_cmd
*cmd
)
5014 struct se_device
*dev
= SE_DEV(cmd
);
5016 struct se_task
*task
;
5019 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
5021 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
;
5023 cdb
= TRANSPORT(dev
)->get_cdb(task
);
5025 memcpy(cdb
, cmd
->t_task
->t_task_cdb
,
5026 scsi_command_size(cmd
->t_task
->t_task_cdb
));
5028 task
->task_size
= cmd
->data_length
;
5030 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) ? 1 : 0;
5032 atomic_inc(&cmd
->t_task
->t_fe_count
);
5033 atomic_inc(&cmd
->t_task
->t_se_count
);
5035 if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) {
5036 struct se_mem
*se_mem
= NULL
, *se_mem_lout
= NULL
;
5037 u32 se_mem_cnt
= 0, task_offset
= 0;
5039 if (!list_empty(T_TASK(cmd
)->t_mem_list
))
5040 se_mem
= list_entry(T_TASK(cmd
)->t_mem_list
->next
,
5041 struct se_mem
, se_list
);
5043 ret
= transport_do_se_mem_map(dev
, task
,
5044 cmd
->t_task
->t_mem_list
, NULL
, se_mem
,
5045 &se_mem_lout
, &se_mem_cnt
, &task_offset
);
5047 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
;
5049 if (dev
->transport
->map_task_SG
)
5050 return dev
->transport
->map_task_SG(task
);
5052 } else if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_NONSG_IO_CDB
) {
5053 if (dev
->transport
->map_task_non_SG
)
5054 return dev
->transport
->map_task_non_SG(task
);
5056 } else if (cmd
->se_cmd_flags
& SCF_SCSI_NON_DATA_CDB
) {
5057 if (dev
->transport
->cdb_none
)
5058 return dev
->transport
->cdb_none(task
);
5062 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
;
5066 /* transport_generic_new_cmd(): Called from transport_processing_thread()
5068 * Allocate storage transport resources from a set of values predefined
5069 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
5070 * Any non zero return here is treated as an "out of resource' op here.
5073 * Generate struct se_task(s) and/or their payloads for this CDB.
5075 static int transport_generic_new_cmd(struct se_cmd
*cmd
)
5077 struct se_portal_group
*se_tpg
;
5078 struct se_task
*task
;
5079 struct se_device
*dev
= SE_DEV(cmd
);
5083 * Determine is the TCM fabric module has already allocated physical
5084 * memory, and is directly calling transport_generic_map_mem_to_cmd()
5085 * to setup beforehand the linked list of physical memory at
5086 * T_TASK(cmd)->t_mem_list of struct se_mem->se_page
5088 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)) {
5089 ret
= transport_allocate_resources(cmd
);
5094 ret
= transport_get_sectors(cmd
);
5098 ret
= transport_new_cmd_obj(cmd
);
5103 * Determine if the calling TCM fabric module is talking to
5104 * Linux/NET via kernel sockets and needs to allocate a
5105 * struct iovec array to complete the struct se_cmd
5107 se_tpg
= SE_LUN(cmd
)->lun_sep
->sep_tpg
;
5108 if (TPG_TFO(se_tpg
)->alloc_cmd_iovecs
!= NULL
) {
5109 ret
= TPG_TFO(se_tpg
)->alloc_cmd_iovecs(cmd
);
5111 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
;
5114 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
5115 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
5116 if (atomic_read(&task
->task_sent
))
5118 if (!dev
->transport
->map_task_SG
)
5121 ret
= dev
->transport
->map_task_SG(task
);
5126 ret
= transport_map_control_cmd_to_task(cmd
);
5132 * For WRITEs, let the iSCSI Target RX Thread know its buffer is ready..
5133 * This WRITE struct se_cmd (and all of its associated struct se_task's)
5134 * will be added to the struct se_device execution queue after its WRITE
5135 * data has arrived. (ie: It gets handled by the transport processing
5136 * thread a second time)
5138 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
5139 transport_add_tasks_to_state_queue(cmd
);
5140 return transport_generic_write_pending(cmd
);
5143 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
5144 * to the execution queue.
5146 transport_execute_tasks(cmd
);
5150 /* transport_generic_process_write():
5154 void transport_generic_process_write(struct se_cmd
*cmd
)
5158 * Copy SCSI Presented DTL sector(s) from received buffers allocated to
5161 if (cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
5162 if (!T_TASK(cmd
)->t_tasks_se_num
) {
5163 unsigned char *dst
, *buf
=
5164 (unsigned char *)T_TASK(cmd
)->t_task_buf
;
5166 dst
= kzalloc(cmd
->cmd_spdtl
), GFP_KERNEL
);
5168 printk(KERN_ERR
"Unable to allocate memory for"
5169 " WRITE underflow\n");
5170 transport_generic_request_failure(cmd
, NULL
,
5171 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
, 1);
5174 memcpy(dst
, buf
, cmd
->cmd_spdtl
);
5176 kfree(T_TASK(cmd
)->t_task_buf
);
5177 T_TASK(cmd
)->t_task_buf
= dst
;
5179 struct scatterlist
*sg
=
5180 (struct scatterlist
*sg
)T_TASK(cmd
)->t_task_buf
;
5181 struct scatterlist
*orig_sg
;
5183 orig_sg
= kzalloc(sizeof(struct scatterlist
) *
5184 T_TASK(cmd
)->t_tasks_se_num
,
5187 printk(KERN_ERR
"Unable to allocate memory"
5188 " for WRITE underflow\n");
5189 transport_generic_request_failure(cmd
, NULL
,
5190 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
, 1);
5194 memcpy(orig_sg
, T_TASK(cmd
)->t_task_buf
,
5195 sizeof(struct scatterlist
) *
5196 T_TASK(cmd
)->t_tasks_se_num
);
5198 cmd
->data_length
= cmd
->cmd_spdtl
;
5200 * FIXME, clear out original struct se_task and state
5203 if (transport_generic_new_cmd(cmd
) < 0) {
5204 transport_generic_request_failure(cmd
, NULL
,
5205 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
, 1);
5210 transport_memcpy_write_sg(cmd
, orig_sg
);
5214 transport_execute_tasks(cmd
);
5216 EXPORT_SYMBOL(transport_generic_process_write
);
5218 /* transport_generic_write_pending():
5222 static int transport_generic_write_pending(struct se_cmd
*cmd
)
5224 unsigned long flags
;
5227 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5228 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
5229 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5231 * For the TCM control CDBs using a contiguous buffer, do the memcpy
5232 * from the passed Linux/SCSI struct scatterlist located at
5233 * T_TASK(se_cmd)->t_task_pt_buf to the contiguous buffer at
5234 * T_TASK(se_cmd)->t_task_buf.
5236 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_CONTIG_TO_SG
)
5237 transport_memcpy_read_contig(cmd
,
5238 T_TASK(cmd
)->t_task_buf
,
5239 T_TASK(cmd
)->t_task_pt_sgl
);
5241 * Clear the se_cmd for WRITE_PENDING status in order to set
5242 * T_TASK(cmd)->t_transport_active=0 so that transport_generic_handle_data
5243 * can be called from HW target mode interrupt code. This is safe
5244 * to be called with transport_off=1 before the CMD_TFO(cmd)->write_pending
5245 * because the se_cmd->se_lun pointer is not being cleared.
5247 transport_cmd_check_stop(cmd
, 1, 0);
5250 * Call the fabric write_pending function here to let the
5251 * frontend know that WRITE buffers are ready.
5253 ret
= CMD_TFO(cmd
)->write_pending(cmd
);
5257 return PYX_TRANSPORT_WRITE_PENDING
;
5260 /* transport_release_cmd_to_pool():
5264 void transport_release_cmd_to_pool(struct se_cmd
*cmd
)
5266 BUG_ON(!T_TASK(cmd
));
5267 BUG_ON(!CMD_TFO(cmd
));
5269 transport_free_se_cmd(cmd
);
5270 CMD_TFO(cmd
)->release_cmd_to_pool(cmd
);
5272 EXPORT_SYMBOL(transport_release_cmd_to_pool
);
5274 /* transport_generic_free_cmd():
5276 * Called from processing frontend to release storage engine resources
5278 void transport_generic_free_cmd(
5281 int release_to_pool
,
5282 int session_reinstatement
)
5284 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) || !T_TASK(cmd
))
5285 transport_release_cmd_to_pool(cmd
);
5287 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
5291 printk(KERN_INFO
"cmd: %p ITT: 0x%08x contains"
5292 " SE_LUN(cmd)\n", cmd
,
5293 CMD_TFO(cmd
)->get_task_tag(cmd
));
5295 transport_lun_remove_cmd(cmd
);
5298 if (wait_for_tasks
&& cmd
->transport_wait_for_tasks
)
5299 cmd
->transport_wait_for_tasks(cmd
, 0, 0);
5301 transport_generic_remove(cmd
, release_to_pool
,
5302 session_reinstatement
);
5305 EXPORT_SYMBOL(transport_generic_free_cmd
);
5307 static void transport_nop_wait_for_tasks(
5310 int session_reinstatement
)
5315 /* transport_lun_wait_for_tasks():
5317 * Called from ConfigFS context to stop the passed struct se_cmd to allow
5318 * an struct se_lun to be successfully shutdown.
5320 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
5322 unsigned long flags
;
5325 * If the frontend has already requested this struct se_cmd to
5326 * be stopped, we can safely ignore this struct se_cmd.
5328 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5329 if (atomic_read(&T_TASK(cmd
)->t_transport_stop
)) {
5330 atomic_set(&T_TASK(cmd
)->transport_lun_stop
, 0);
5331 DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop =="
5332 " TRUE, skipping\n", CMD_TFO(cmd
)->get_task_tag(cmd
));
5333 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5334 transport_cmd_check_stop(cmd
, 1, 0);
5337 atomic_set(&T_TASK(cmd
)->transport_lun_fe_stop
, 1);
5338 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5340 wake_up_interruptible(&SE_DEV(cmd
)->dev_queue_obj
->thread_wq
);
5342 ret
= transport_stop_tasks_for_cmd(cmd
);
5344 DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:"
5345 " %d\n", cmd
, T_TASK(cmd
)->t_task_cdbs
, ret
);
5347 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
5348 CMD_TFO(cmd
)->get_task_tag(cmd
));
5349 wait_for_completion(&T_TASK(cmd
)->transport_lun_stop_comp
);
5350 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
5351 CMD_TFO(cmd
)->get_task_tag(cmd
));
5353 transport_remove_cmd_from_queue(cmd
, SE_DEV(cmd
)->dev_queue_obj
);
5358 /* #define DEBUG_CLEAR_LUN */
5359 #ifdef DEBUG_CLEAR_LUN
5360 #define DEBUG_CLEAR_L(x...) printk(KERN_INFO x)
5362 #define DEBUG_CLEAR_L(x...)
5365 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
5367 struct se_cmd
*cmd
= NULL
;
5368 unsigned long lun_flags
, cmd_flags
;
5370 * Do exception processing and return CHECK_CONDITION status to the
5373 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
5374 while (!list_empty_careful(&lun
->lun_cmd_list
)) {
5375 cmd
= list_entry(lun
->lun_cmd_list
.next
,
5376 struct se_cmd
, se_lun_list
);
5377 list_del(&cmd
->se_lun_list
);
5379 if (!(T_TASK(cmd
))) {
5380 printk(KERN_ERR
"ITT: 0x%08x, T_TASK(cmd) = NULL"
5381 "[i,t]_state: %u/%u\n",
5382 CMD_TFO(cmd
)->get_task_tag(cmd
),
5383 CMD_TFO(cmd
)->get_cmd_state(cmd
), cmd
->t_state
);
5386 atomic_set(&T_TASK(cmd
)->transport_lun_active
, 0);
5388 * This will notify iscsi_target_transport.c:
5389 * transport_cmd_check_stop() that a LUN shutdown is in
5390 * progress for the iscsi_cmd_t.
5392 spin_lock(&T_TASK(cmd
)->t_state_lock
);
5393 DEBUG_CLEAR_L("SE_LUN[%d] - Setting T_TASK(cmd)->transport"
5394 "_lun_stop for ITT: 0x%08x\n",
5395 SE_LUN(cmd
)->unpacked_lun
,
5396 CMD_TFO(cmd
)->get_task_tag(cmd
));
5397 atomic_set(&T_TASK(cmd
)->transport_lun_stop
, 1);
5398 spin_unlock(&T_TASK(cmd
)->t_state_lock
);
5400 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
5402 if (!(SE_LUN(cmd
))) {
5403 printk(KERN_ERR
"ITT: 0x%08x, [i,t]_state: %u/%u\n",
5404 CMD_TFO(cmd
)->get_task_tag(cmd
),
5405 CMD_TFO(cmd
)->get_cmd_state(cmd
), cmd
->t_state
);
5409 * If the Storage engine still owns the iscsi_cmd_t, determine
5410 * and/or stop its context.
5412 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport"
5413 "_lun_wait_for_tasks()\n", SE_LUN(cmd
)->unpacked_lun
,
5414 CMD_TFO(cmd
)->get_task_tag(cmd
));
5416 if (transport_lun_wait_for_tasks(cmd
, SE_LUN(cmd
)) < 0) {
5417 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
5421 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
5422 "_wait_for_tasks(): SUCCESS\n",
5423 SE_LUN(cmd
)->unpacked_lun
,
5424 CMD_TFO(cmd
)->get_task_tag(cmd
));
5426 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5427 if (!(atomic_read(&T_TASK(cmd
)->transport_dev_active
))) {
5428 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5431 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 0);
5432 transport_all_task_dev_remove_state(cmd
);
5433 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5435 transport_free_dev_tasks(cmd
);
5437 * The Storage engine stopped this struct se_cmd before it was
5438 * send to the fabric frontend for delivery back to the
5439 * Initiator Node. Return this SCSI CDB back with an
5440 * CHECK_CONDITION status.
5443 transport_send_check_condition_and_sense(cmd
,
5444 TCM_NON_EXISTENT_LUN
, 0);
5446 * If the fabric frontend is waiting for this iscsi_cmd_t to
5447 * be released, notify the waiting thread now that LU has
5448 * finished accessing it.
5450 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5451 if (atomic_read(&T_TASK(cmd
)->transport_lun_fe_stop
)) {
5452 DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for"
5453 " struct se_cmd: %p ITT: 0x%08x\n",
5455 cmd
, CMD_TFO(cmd
)->get_task_tag(cmd
));
5457 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
5459 transport_cmd_check_stop(cmd
, 1, 0);
5460 complete(&T_TASK(cmd
)->transport_lun_fe_stop_comp
);
5461 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
5464 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
5465 lun
->unpacked_lun
, CMD_TFO(cmd
)->get_task_tag(cmd
));
5467 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5468 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
5470 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
5473 static int transport_clear_lun_thread(void *p
)
5475 struct se_lun
*lun
= (struct se_lun
*)p
;
5477 __transport_clear_lun_from_sessions(lun
);
5478 complete(&lun
->lun_shutdown_comp
);
5483 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
5485 struct task_struct
*kt
;
5487 kt
= kthread_run(transport_clear_lun_thread
, (void *)lun
,
5488 "tcm_cl_%u", lun
->unpacked_lun
);
5490 printk(KERN_ERR
"Unable to start clear_lun thread\n");
5493 wait_for_completion(&lun
->lun_shutdown_comp
);
5498 /* transport_generic_wait_for_tasks():
5500 * Called from frontend or passthrough context to wait for storage engine
5501 * to pause and/or release frontend generated struct se_cmd.
5503 static void transport_generic_wait_for_tasks(
5506 int session_reinstatement
)
5508 unsigned long flags
;
5510 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
))
5513 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5515 * If we are already stopped due to an external event (ie: LUN shutdown)
5516 * sleep until the connection can have the passed struct se_cmd back.
5517 * The T_TASK(cmd)->transport_lun_stopped_sem will be upped by
5518 * transport_clear_lun_from_sessions() once the ConfigFS context caller
5519 * has completed its operation on the struct se_cmd.
5521 if (atomic_read(&T_TASK(cmd
)->transport_lun_stop
)) {
5523 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping"
5524 " wait_for_completion(&T_TASK(cmd)transport_lun_fe"
5525 "_stop_comp); for ITT: 0x%08x\n",
5526 CMD_TFO(cmd
)->get_task_tag(cmd
));
5528 * There is a special case for WRITES where a FE exception +
5529 * LUN shutdown means ConfigFS context is still sleeping on
5530 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
5531 * We go ahead and up transport_lun_stop_comp just to be sure
5534 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5535 complete(&T_TASK(cmd
)->transport_lun_stop_comp
);
5536 wait_for_completion(&T_TASK(cmd
)->transport_lun_fe_stop_comp
);
5537 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5539 transport_all_task_dev_remove_state(cmd
);
5541 * At this point, the frontend who was the originator of this
5542 * struct se_cmd, now owns the structure and can be released through
5543 * normal means below.
5545 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped"
5546 " wait_for_completion(&T_TASK(cmd)transport_lun_fe_"
5547 "stop_comp); for ITT: 0x%08x\n",
5548 CMD_TFO(cmd
)->get_task_tag(cmd
));
5550 atomic_set(&T_TASK(cmd
)->transport_lun_stop
, 0);
5552 if (!atomic_read(&T_TASK(cmd
)->t_transport_active
) ||
5553 atomic_read(&T_TASK(cmd
)->t_transport_aborted
))
5556 atomic_set(&T_TASK(cmd
)->t_transport_stop
, 1);
5558 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x"
5559 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
5560 " = TRUE\n", cmd
, CMD_TFO(cmd
)->get_task_tag(cmd
),
5561 CMD_TFO(cmd
)->get_cmd_state(cmd
), cmd
->t_state
,
5562 cmd
->deferred_t_state
);
5564 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5566 wake_up_interruptible(&SE_DEV(cmd
)->dev_queue_obj
->thread_wq
);
5568 wait_for_completion(&T_TASK(cmd
)->t_transport_stop_comp
);
5570 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5571 atomic_set(&T_TASK(cmd
)->t_transport_active
, 0);
5572 atomic_set(&T_TASK(cmd
)->t_transport_stop
, 0);
5574 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion("
5575 "&T_TASK(cmd)->t_transport_stop_comp) for ITT: 0x%08x\n",
5576 CMD_TFO(cmd
)->get_task_tag(cmd
));
5578 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5582 transport_generic_free_cmd(cmd
, 0, 0, session_reinstatement
);
5585 static int transport_get_sense_codes(
5590 *asc
= cmd
->scsi_asc
;
5591 *ascq
= cmd
->scsi_ascq
;
5596 static int transport_set_sense_codes(
5601 cmd
->scsi_asc
= asc
;
5602 cmd
->scsi_ascq
= ascq
;
5607 int transport_send_check_condition_and_sense(
5612 unsigned char *buffer
= cmd
->sense_buffer
;
5613 unsigned long flags
;
5615 u8 asc
= 0, ascq
= 0;
5617 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5618 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
5619 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5622 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
5623 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5625 if (!reason
&& from_transport
)
5628 if (!from_transport
)
5629 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
5631 * Data Segment and SenseLength of the fabric response PDU.
5633 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
5634 * from include/scsi/scsi_cmnd.h
5636 offset
= CMD_TFO(cmd
)->set_fabric_sense_len(cmd
,
5637 TRANSPORT_SENSE_BUFFER
);
5639 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
5640 * SENSE KEY values from include/scsi/scsi.h
5643 case TCM_NON_EXISTENT_LUN
:
5644 case TCM_UNSUPPORTED_SCSI_OPCODE
:
5645 case TCM_SECTOR_COUNT_TOO_MANY
:
5647 buffer
[offset
] = 0x70;
5648 /* ILLEGAL REQUEST */
5649 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
5650 /* INVALID COMMAND OPERATION CODE */
5651 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
5653 case TCM_UNKNOWN_MODE_PAGE
:
5655 buffer
[offset
] = 0x70;
5656 /* ILLEGAL REQUEST */
5657 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
5658 /* INVALID FIELD IN CDB */
5659 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
5661 case TCM_CHECK_CONDITION_ABORT_CMD
:
5663 buffer
[offset
] = 0x70;
5664 /* ABORTED COMMAND */
5665 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5666 /* BUS DEVICE RESET FUNCTION OCCURRED */
5667 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
5668 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
5670 case TCM_INCORRECT_AMOUNT_OF_DATA
:
5672 buffer
[offset
] = 0x70;
5673 /* ABORTED COMMAND */
5674 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5676 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
5677 /* NOT ENOUGH UNSOLICITED DATA */
5678 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
5680 case TCM_INVALID_CDB_FIELD
:
5682 buffer
[offset
] = 0x70;
5683 /* ABORTED COMMAND */
5684 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5685 /* INVALID FIELD IN CDB */
5686 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
5688 case TCM_INVALID_PARAMETER_LIST
:
5690 buffer
[offset
] = 0x70;
5691 /* ABORTED COMMAND */
5692 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5693 /* INVALID FIELD IN PARAMETER LIST */
5694 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
5696 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
5698 buffer
[offset
] = 0x70;
5699 /* ABORTED COMMAND */
5700 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5702 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
5703 /* UNEXPECTED_UNSOLICITED_DATA */
5704 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
5706 case TCM_SERVICE_CRC_ERROR
:
5708 buffer
[offset
] = 0x70;
5709 /* ABORTED COMMAND */
5710 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5711 /* PROTOCOL SERVICE CRC ERROR */
5712 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
5714 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
5716 case TCM_SNACK_REJECTED
:
5718 buffer
[offset
] = 0x70;
5719 /* ABORTED COMMAND */
5720 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5722 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
5723 /* FAILED RETRANSMISSION REQUEST */
5724 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
5726 case TCM_WRITE_PROTECTED
:
5728 buffer
[offset
] = 0x70;
5730 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
5731 /* WRITE PROTECTED */
5732 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
5734 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
5736 buffer
[offset
] = 0x70;
5737 /* UNIT ATTENTION */
5738 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
5739 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
5740 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
5741 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
5743 case TCM_CHECK_CONDITION_NOT_READY
:
5745 buffer
[offset
] = 0x70;
5747 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
5748 transport_get_sense_codes(cmd
, &asc
, &ascq
);
5749 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
5750 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
5752 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
5755 buffer
[offset
] = 0x70;
5756 /* ILLEGAL REQUEST */
5757 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
5758 /* LOGICAL UNIT COMMUNICATION FAILURE */
5759 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
5763 * This code uses linux/include/scsi/scsi.h SAM status codes!
5765 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
5767 * Automatically padded, this value is encoded in the fabric's
5768 * data_length response PDU containing the SCSI defined sense data.
5770 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
5773 CMD_TFO(cmd
)->queue_status(cmd
);
5776 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
5778 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
5782 if (atomic_read(&T_TASK(cmd
)->t_transport_aborted
) != 0) {
5783 if (!(send_status
) ||
5784 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
5787 printk(KERN_INFO
"Sending delayed SAM_STAT_TASK_ABORTED"
5788 " status for CDB: 0x%02x ITT: 0x%08x\n",
5789 T_TASK(cmd
)->t_task_cdb
[0],
5790 CMD_TFO(cmd
)->get_task_tag(cmd
));
5792 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
5793 CMD_TFO(cmd
)->queue_status(cmd
);
5798 EXPORT_SYMBOL(transport_check_aborted_status
);
5800 void transport_send_task_abort(struct se_cmd
*cmd
)
5803 * If there are still expected incoming fabric WRITEs, we wait
5804 * until until they have completed before sending a TASK_ABORTED
5805 * response. This response with TASK_ABORTED status will be
5806 * queued back to fabric module by transport_check_aborted_status().
5808 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
5809 if (CMD_TFO(cmd
)->write_pending_status(cmd
) != 0) {
5810 atomic_inc(&T_TASK(cmd
)->t_transport_aborted
);
5811 smp_mb__after_atomic_inc();
5812 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
5813 transport_new_cmd_failure(cmd
);
5817 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
5819 printk(KERN_INFO
"Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
5820 " ITT: 0x%08x\n", T_TASK(cmd
)->t_task_cdb
[0],
5821 CMD_TFO(cmd
)->get_task_tag(cmd
));
5823 CMD_TFO(cmd
)->queue_status(cmd
);
5826 /* transport_generic_do_tmr():
5830 int transport_generic_do_tmr(struct se_cmd
*cmd
)
5832 struct se_cmd
*ref_cmd
;
5833 struct se_device
*dev
= SE_DEV(cmd
);
5834 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
5837 switch (tmr
->function
) {
5839 ref_cmd
= tmr
->ref_cmd
;
5840 tmr
->response
= TMR_FUNCTION_REJECTED
;
5842 case ABORT_TASK_SET
:
5844 case CLEAR_TASK_SET
:
5845 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
5848 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
5849 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
5850 TMR_FUNCTION_REJECTED
;
5853 case TARGET_WARM_RESET
:
5854 transport_generic_host_reset(dev
->se_hba
);
5855 tmr
->response
= TMR_FUNCTION_REJECTED
;
5857 case TARGET_COLD_RESET
:
5858 transport_generic_host_reset(dev
->se_hba
);
5859 transport_generic_cold_reset(dev
->se_hba
);
5860 tmr
->response
= TMR_FUNCTION_REJECTED
;
5864 printk(KERN_ERR
"Uknown TMR function: 0x%02x.\n",
5866 tmr
->response
= TMR_FUNCTION_REJECTED
;
5870 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
5871 CMD_TFO(cmd
)->queue_tm_rsp(cmd
);
5873 transport_cmd_check_stop(cmd
, 2, 0);
5878 * Called with spin_lock_irq(&dev->execute_task_lock); held
5881 static struct se_task
*
5882 transport_get_task_from_state_list(struct se_device
*dev
)
5884 struct se_task
*task
;
5886 if (list_empty(&dev
->state_task_list
))
5889 list_for_each_entry(task
, &dev
->state_task_list
, t_state_list
)
5892 list_del(&task
->t_state_list
);
5893 atomic_set(&task
->task_state_active
, 0);
5898 static void transport_processing_shutdown(struct se_device
*dev
)
5901 struct se_queue_req
*qr
;
5902 struct se_task
*task
;
5904 unsigned long flags
;
5906 * Empty the struct se_device's struct se_task state list.
5908 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5909 while ((task
= transport_get_task_from_state_list(dev
))) {
5910 if (!(TASK_CMD(task
))) {
5911 printk(KERN_ERR
"TASK_CMD(task) is NULL!\n");
5914 cmd
= TASK_CMD(task
);
5917 printk(KERN_ERR
"T_TASK(cmd) is NULL for task: %p cmd:"
5918 " %p ITT: 0x%08x\n", task
, cmd
,
5919 CMD_TFO(cmd
)->get_task_tag(cmd
));
5922 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
5924 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5926 DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x,"
5927 " i_state/def_i_state: %d/%d, t_state/def_t_state:"
5928 " %d/%d cdb: 0x%02x\n", cmd
, task
,
5929 CMD_TFO(cmd
)->get_task_tag(cmd
), cmd
->cmd_sn
,
5930 CMD_TFO(cmd
)->get_cmd_state(cmd
), cmd
->deferred_i_state
,
5931 cmd
->t_state
, cmd
->deferred_t_state
,
5932 T_TASK(cmd
)->t_task_cdb
[0]);
5933 DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:"
5934 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5935 " t_transport_stop: %d t_transport_sent: %d\n",
5936 CMD_TFO(cmd
)->get_task_tag(cmd
),
5937 T_TASK(cmd
)->t_task_cdbs
,
5938 atomic_read(&T_TASK(cmd
)->t_task_cdbs_left
),
5939 atomic_read(&T_TASK(cmd
)->t_task_cdbs_sent
),
5940 atomic_read(&T_TASK(cmd
)->t_transport_active
),
5941 atomic_read(&T_TASK(cmd
)->t_transport_stop
),
5942 atomic_read(&T_TASK(cmd
)->t_transport_sent
));
5944 if (atomic_read(&task
->task_active
)) {
5945 atomic_set(&task
->task_stop
, 1);
5946 spin_unlock_irqrestore(
5947 &T_TASK(cmd
)->t_state_lock
, flags
);
5949 DEBUG_DO("Waiting for task: %p to shutdown for dev:"
5950 " %p\n", task
, dev
);
5951 wait_for_completion(&task
->task_stop_comp
);
5952 DEBUG_DO("Completed task: %p shutdown for dev: %p\n",
5955 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5956 atomic_dec(&T_TASK(cmd
)->t_task_cdbs_left
);
5958 atomic_set(&task
->task_active
, 0);
5959 atomic_set(&task
->task_stop
, 0);
5961 if (atomic_read(&task
->task_execute_queue
) != 0)
5962 transport_remove_task_from_execute_queue(task
, dev
);
5964 __transport_stop_task_timer(task
, &flags
);
5966 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_task_cdbs_ex_left
))) {
5967 spin_unlock_irqrestore(
5968 &T_TASK(cmd
)->t_state_lock
, flags
);
5970 DEBUG_DO("Skipping task: %p, dev: %p for"
5971 " t_task_cdbs_ex_left: %d\n", task
, dev
,
5972 atomic_read(&T_TASK(cmd
)->t_task_cdbs_ex_left
));
5974 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5978 if (atomic_read(&T_TASK(cmd
)->t_transport_active
)) {
5979 DEBUG_DO("got t_transport_active = 1 for task: %p, dev:"
5980 " %p\n", task
, dev
);
5982 if (atomic_read(&T_TASK(cmd
)->t_fe_count
)) {
5983 spin_unlock_irqrestore(
5984 &T_TASK(cmd
)->t_state_lock
, flags
);
5985 transport_send_check_condition_and_sense(
5986 cmd
, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
,
5988 transport_remove_cmd_from_queue(cmd
,
5989 SE_DEV(cmd
)->dev_queue_obj
);
5991 transport_lun_remove_cmd(cmd
);
5992 transport_cmd_check_stop(cmd
, 1, 0);
5994 spin_unlock_irqrestore(
5995 &T_TASK(cmd
)->t_state_lock
, flags
);
5997 transport_remove_cmd_from_queue(cmd
,
5998 SE_DEV(cmd
)->dev_queue_obj
);
6000 transport_lun_remove_cmd(cmd
);
6002 if (transport_cmd_check_stop(cmd
, 1, 0))
6003 transport_generic_remove(cmd
, 0, 0);
6006 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
6009 DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n",
6012 if (atomic_read(&T_TASK(cmd
)->t_fe_count
)) {
6013 spin_unlock_irqrestore(
6014 &T_TASK(cmd
)->t_state_lock
, flags
);
6015 transport_send_check_condition_and_sense(cmd
,
6016 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
6017 transport_remove_cmd_from_queue(cmd
,
6018 SE_DEV(cmd
)->dev_queue_obj
);
6020 transport_lun_remove_cmd(cmd
);
6021 transport_cmd_check_stop(cmd
, 1, 0);
6023 spin_unlock_irqrestore(
6024 &T_TASK(cmd
)->t_state_lock
, flags
);
6026 transport_remove_cmd_from_queue(cmd
,
6027 SE_DEV(cmd
)->dev_queue_obj
);
6028 transport_lun_remove_cmd(cmd
);
6030 if (transport_cmd_check_stop(cmd
, 1, 0))
6031 transport_generic_remove(cmd
, 0, 0);
6034 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
6036 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
6038 * Empty the struct se_device's struct se_cmd list.
6040 spin_lock_irqsave(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
6041 while ((qr
= __transport_get_qr_from_queue(dev
->dev_queue_obj
))) {
6042 spin_unlock_irqrestore(
6043 &dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
6044 cmd
= (struct se_cmd
*)qr
->cmd
;
6048 DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n",
6051 if (atomic_read(&T_TASK(cmd
)->t_fe_count
)) {
6052 transport_send_check_condition_and_sense(cmd
,
6053 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
6055 transport_lun_remove_cmd(cmd
);
6056 transport_cmd_check_stop(cmd
, 1, 0);
6058 transport_lun_remove_cmd(cmd
);
6059 if (transport_cmd_check_stop(cmd
, 1, 0))
6060 transport_generic_remove(cmd
, 0, 0);
6062 spin_lock_irqsave(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
6064 spin_unlock_irqrestore(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
6067 /* transport_processing_thread():
6071 static int transport_processing_thread(void *param
)
6075 struct se_device
*dev
= (struct se_device
*) param
;
6076 struct se_queue_req
*qr
;
6078 set_user_nice(current
, -20);
6080 while (!kthread_should_stop()) {
6081 ret
= wait_event_interruptible(dev
->dev_queue_obj
->thread_wq
,
6082 atomic_read(&dev
->dev_queue_obj
->queue_cnt
) ||
6083 kthread_should_stop());
6087 spin_lock_irq(&dev
->dev_status_lock
);
6088 if (dev
->dev_status
& TRANSPORT_DEVICE_SHUTDOWN
) {
6089 spin_unlock_irq(&dev
->dev_status_lock
);
6090 transport_processing_shutdown(dev
);
6093 spin_unlock_irq(&dev
->dev_status_lock
);
6096 __transport_execute_tasks(dev
);
6098 qr
= transport_get_qr_from_queue(dev
->dev_queue_obj
);
6102 cmd
= (struct se_cmd
*)qr
->cmd
;
6103 t_state
= qr
->state
;
6107 case TRANSPORT_NEW_CMD_MAP
:
6108 if (!(CMD_TFO(cmd
)->new_cmd_map
)) {
6109 printk(KERN_ERR
"CMD_TFO(cmd)->new_cmd_map is"
6110 " NULL for TRANSPORT_NEW_CMD_MAP\n");
6113 ret
= CMD_TFO(cmd
)->new_cmd_map(cmd
);
6115 cmd
->transport_error_status
= ret
;
6116 transport_generic_request_failure(cmd
, NULL
,
6117 0, (cmd
->data_direction
!=
6122 case TRANSPORT_NEW_CMD
:
6123 ret
= transport_generic_new_cmd(cmd
);
6125 cmd
->transport_error_status
= ret
;
6126 transport_generic_request_failure(cmd
, NULL
,
6127 0, (cmd
->data_direction
!=
6131 case TRANSPORT_PROCESS_WRITE
:
6132 transport_generic_process_write(cmd
);
6134 case TRANSPORT_COMPLETE_OK
:
6135 transport_stop_all_task_timers(cmd
);
6136 transport_generic_complete_ok(cmd
);
6138 case TRANSPORT_REMOVE
:
6139 transport_generic_remove(cmd
, 1, 0);
6141 case TRANSPORT_PROCESS_TMR
:
6142 transport_generic_do_tmr(cmd
);
6144 case TRANSPORT_COMPLETE_FAILURE
:
6145 transport_generic_request_failure(cmd
, NULL
, 1, 1);
6147 case TRANSPORT_COMPLETE_TIMEOUT
:
6148 transport_stop_all_task_timers(cmd
);
6149 transport_generic_request_timeout(cmd
);
6152 printk(KERN_ERR
"Unknown t_state: %d deferred_t_state:"
6153 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
6154 " %u\n", t_state
, cmd
->deferred_t_state
,
6155 CMD_TFO(cmd
)->get_task_tag(cmd
),
6156 CMD_TFO(cmd
)->get_cmd_state(cmd
),
6157 SE_LUN(cmd
)->unpacked_lun
);
6165 transport_release_all_cmds(dev
);
6166 dev
->process_thread
= NULL
;