1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/version.h>
30 #include <linux/net.h>
31 #include <linux/delay.h>
32 #include <linux/string.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/blkdev.h>
36 #include <linux/spinlock.h>
37 #include <linux/kthread.h>
39 #include <linux/cdrom.h>
40 #include <asm/unaligned.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_cmnd.h>
45 #include <scsi/libsas.h> /* For TASK_ATTR_* */
47 #include <target/target_core_base.h>
48 #include <target/target_core_device.h>
49 #include <target/target_core_tmr.h>
50 #include <target/target_core_tpg.h>
51 #include <target/target_core_transport.h>
52 #include <target/target_core_fabric_ops.h>
53 #include <target/target_core_configfs.h>
55 #include "target_core_alua.h"
56 #include "target_core_hba.h"
57 #include "target_core_pr.h"
58 #include "target_core_scdb.h"
59 #include "target_core_ua.h"
61 /* #define DEBUG_CDB_HANDLER */
62 #ifdef DEBUG_CDB_HANDLER
63 #define DEBUG_CDB_H(x...) printk(KERN_INFO x)
65 #define DEBUG_CDB_H(x...)
68 /* #define DEBUG_CMD_MAP */
70 #define DEBUG_CMD_M(x...) printk(KERN_INFO x)
72 #define DEBUG_CMD_M(x...)
75 /* #define DEBUG_MEM_ALLOC */
76 #ifdef DEBUG_MEM_ALLOC
77 #define DEBUG_MEM(x...) printk(KERN_INFO x)
79 #define DEBUG_MEM(x...)
82 /* #define DEBUG_MEM2_ALLOC */
83 #ifdef DEBUG_MEM2_ALLOC
84 #define DEBUG_MEM2(x...) printk(KERN_INFO x)
86 #define DEBUG_MEM2(x...)
89 /* #define DEBUG_SG_CALC */
91 #define DEBUG_SC(x...) printk(KERN_INFO x)
93 #define DEBUG_SC(x...)
96 /* #define DEBUG_SE_OBJ */
98 #define DEBUG_SO(x...) printk(KERN_INFO x)
100 #define DEBUG_SO(x...)
103 /* #define DEBUG_CMD_VOL */
105 #define DEBUG_VOL(x...) printk(KERN_INFO x)
107 #define DEBUG_VOL(x...)
110 /* #define DEBUG_CMD_STOP */
111 #ifdef DEBUG_CMD_STOP
112 #define DEBUG_CS(x...) printk(KERN_INFO x)
114 #define DEBUG_CS(x...)
117 /* #define DEBUG_PASSTHROUGH */
118 #ifdef DEBUG_PASSTHROUGH
119 #define DEBUG_PT(x...) printk(KERN_INFO x)
121 #define DEBUG_PT(x...)
124 /* #define DEBUG_TASK_STOP */
125 #ifdef DEBUG_TASK_STOP
126 #define DEBUG_TS(x...) printk(KERN_INFO x)
128 #define DEBUG_TS(x...)
131 /* #define DEBUG_TRANSPORT_STOP */
132 #ifdef DEBUG_TRANSPORT_STOP
133 #define DEBUG_TRANSPORT_S(x...) printk(KERN_INFO x)
135 #define DEBUG_TRANSPORT_S(x...)
138 /* #define DEBUG_TASK_FAILURE */
139 #ifdef DEBUG_TASK_FAILURE
140 #define DEBUG_TF(x...) printk(KERN_INFO x)
142 #define DEBUG_TF(x...)
145 /* #define DEBUG_DEV_OFFLINE */
146 #ifdef DEBUG_DEV_OFFLINE
147 #define DEBUG_DO(x...) printk(KERN_INFO x)
149 #define DEBUG_DO(x...)
152 /* #define DEBUG_TASK_STATE */
153 #ifdef DEBUG_TASK_STATE
154 #define DEBUG_TSTATE(x...) printk(KERN_INFO x)
156 #define DEBUG_TSTATE(x...)
159 /* #define DEBUG_STATUS_THR */
160 #ifdef DEBUG_STATUS_THR
161 #define DEBUG_ST(x...) printk(KERN_INFO x)
163 #define DEBUG_ST(x...)
166 /* #define DEBUG_TASK_TIMEOUT */
167 #ifdef DEBUG_TASK_TIMEOUT
168 #define DEBUG_TT(x...) printk(KERN_INFO x)
170 #define DEBUG_TT(x...)
173 /* #define DEBUG_GENERIC_REQUEST_FAILURE */
174 #ifdef DEBUG_GENERIC_REQUEST_FAILURE
175 #define DEBUG_GRF(x...) printk(KERN_INFO x)
177 #define DEBUG_GRF(x...)
180 /* #define DEBUG_SAM_TASK_ATTRS */
181 #ifdef DEBUG_SAM_TASK_ATTRS
182 #define DEBUG_STA(x...) printk(KERN_INFO x)
184 #define DEBUG_STA(x...)
187 struct se_global
*se_global
;
189 static struct kmem_cache
*se_cmd_cache
;
190 static struct kmem_cache
*se_sess_cache
;
191 struct kmem_cache
*se_tmr_req_cache
;
192 struct kmem_cache
*se_ua_cache
;
193 struct kmem_cache
*se_mem_cache
;
194 struct kmem_cache
*t10_pr_reg_cache
;
195 struct kmem_cache
*t10_alua_lu_gp_cache
;
196 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
197 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
198 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
200 /* Used for transport_dev_get_map_*() */
201 typedef int (*map_func_t
)(struct se_task
*, u32
);
203 static int transport_generic_write_pending(struct se_cmd
*);
204 static int transport_processing_thread(void *);
205 static int __transport_execute_tasks(struct se_device
*dev
);
206 static void transport_complete_task_attr(struct se_cmd
*cmd
);
207 static void transport_direct_request_timeout(struct se_cmd
*cmd
);
208 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
209 static u32
transport_generic_get_cdb_count(struct se_cmd
*cmd
,
210 unsigned long long starting_lba
, u32 sectors
,
211 enum dma_data_direction data_direction
,
212 struct list_head
*mem_list
, int set_counts
);
213 static int transport_generic_get_mem(struct se_cmd
*cmd
, u32 length
,
215 static int transport_generic_remove(struct se_cmd
*cmd
,
216 int release_to_pool
, int session_reinstatement
);
217 static int transport_get_sectors(struct se_cmd
*cmd
);
218 static struct list_head
*transport_init_se_mem_list(void);
219 static int transport_map_sg_to_mem(struct se_cmd
*cmd
,
220 struct list_head
*se_mem_list
, void *in_mem
,
222 static void transport_memcpy_se_mem_read_contig(struct se_cmd
*cmd
,
223 unsigned char *dst
, struct list_head
*se_mem_list
);
224 static void transport_release_fe_cmd(struct se_cmd
*cmd
);
225 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
226 struct se_queue_obj
*qobj
);
227 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
228 static void transport_stop_all_task_timers(struct se_cmd
*cmd
);
230 int transport_emulate_control_cdb(struct se_task
*task
);
232 int init_se_global(void)
234 struct se_global
*global
;
236 global
= kzalloc(sizeof(struct se_global
), GFP_KERNEL
);
238 printk(KERN_ERR
"Unable to allocate memory for struct se_global\n");
242 INIT_LIST_HEAD(&global
->g_lu_gps_list
);
243 INIT_LIST_HEAD(&global
->g_se_tpg_list
);
244 INIT_LIST_HEAD(&global
->g_hba_list
);
245 INIT_LIST_HEAD(&global
->g_se_dev_list
);
246 spin_lock_init(&global
->g_device_lock
);
247 spin_lock_init(&global
->hba_lock
);
248 spin_lock_init(&global
->se_tpg_lock
);
249 spin_lock_init(&global
->lu_gps_lock
);
250 spin_lock_init(&global
->plugin_class_lock
);
252 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
253 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
254 if (!(se_cmd_cache
)) {
255 printk(KERN_ERR
"kmem_cache_create for struct se_cmd failed\n");
258 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
259 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
261 if (!(se_tmr_req_cache
)) {
262 printk(KERN_ERR
"kmem_cache_create() for struct se_tmr_req"
266 se_sess_cache
= kmem_cache_create("se_sess_cache",
267 sizeof(struct se_session
), __alignof__(struct se_session
),
269 if (!(se_sess_cache
)) {
270 printk(KERN_ERR
"kmem_cache_create() for struct se_session"
274 se_ua_cache
= kmem_cache_create("se_ua_cache",
275 sizeof(struct se_ua
), __alignof__(struct se_ua
),
277 if (!(se_ua_cache
)) {
278 printk(KERN_ERR
"kmem_cache_create() for struct se_ua failed\n");
281 se_mem_cache
= kmem_cache_create("se_mem_cache",
282 sizeof(struct se_mem
), __alignof__(struct se_mem
), 0, NULL
);
283 if (!(se_mem_cache
)) {
284 printk(KERN_ERR
"kmem_cache_create() for struct se_mem failed\n");
287 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
288 sizeof(struct t10_pr_registration
),
289 __alignof__(struct t10_pr_registration
), 0, NULL
);
290 if (!(t10_pr_reg_cache
)) {
291 printk(KERN_ERR
"kmem_cache_create() for struct t10_pr_registration"
295 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
296 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
298 if (!(t10_alua_lu_gp_cache
)) {
299 printk(KERN_ERR
"kmem_cache_create() for t10_alua_lu_gp_cache"
303 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
304 sizeof(struct t10_alua_lu_gp_member
),
305 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
306 if (!(t10_alua_lu_gp_mem_cache
)) {
307 printk(KERN_ERR
"kmem_cache_create() for t10_alua_lu_gp_mem_"
311 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
312 sizeof(struct t10_alua_tg_pt_gp
),
313 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
314 if (!(t10_alua_tg_pt_gp_cache
)) {
315 printk(KERN_ERR
"kmem_cache_create() for t10_alua_tg_pt_gp_"
319 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
320 "t10_alua_tg_pt_gp_mem_cache",
321 sizeof(struct t10_alua_tg_pt_gp_member
),
322 __alignof__(struct t10_alua_tg_pt_gp_member
),
324 if (!(t10_alua_tg_pt_gp_mem_cache
)) {
325 printk(KERN_ERR
"kmem_cache_create() for t10_alua_tg_pt_gp_"
335 kmem_cache_destroy(se_cmd_cache
);
336 if (se_tmr_req_cache
)
337 kmem_cache_destroy(se_tmr_req_cache
);
339 kmem_cache_destroy(se_sess_cache
);
341 kmem_cache_destroy(se_ua_cache
);
343 kmem_cache_destroy(se_mem_cache
);
344 if (t10_pr_reg_cache
)
345 kmem_cache_destroy(t10_pr_reg_cache
);
346 if (t10_alua_lu_gp_cache
)
347 kmem_cache_destroy(t10_alua_lu_gp_cache
);
348 if (t10_alua_lu_gp_mem_cache
)
349 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
350 if (t10_alua_tg_pt_gp_cache
)
351 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
352 if (t10_alua_tg_pt_gp_mem_cache
)
353 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
358 void release_se_global(void)
360 struct se_global
*global
;
366 kmem_cache_destroy(se_cmd_cache
);
367 kmem_cache_destroy(se_tmr_req_cache
);
368 kmem_cache_destroy(se_sess_cache
);
369 kmem_cache_destroy(se_ua_cache
);
370 kmem_cache_destroy(se_mem_cache
);
371 kmem_cache_destroy(t10_pr_reg_cache
);
372 kmem_cache_destroy(t10_alua_lu_gp_cache
);
373 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
374 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
375 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
381 /* SCSI statistics table index */
382 static struct scsi_index_table scsi_index_table
;
385 * Initialize the index table for allocating unique row indexes to various mib
388 void init_scsi_index_table(void)
390 memset(&scsi_index_table
, 0, sizeof(struct scsi_index_table
));
391 spin_lock_init(&scsi_index_table
.lock
);
395 * Allocate a new row index for the entry type specified
397 u32
scsi_get_new_index(scsi_index_t type
)
401 if ((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
)) {
402 printk(KERN_ERR
"Invalid index type %d\n", type
);
406 spin_lock(&scsi_index_table
.lock
);
407 new_index
= ++scsi_index_table
.scsi_mib_index
[type
];
409 new_index
= ++scsi_index_table
.scsi_mib_index
[type
];
410 spin_unlock(&scsi_index_table
.lock
);
415 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
417 atomic_set(&qobj
->queue_cnt
, 0);
418 INIT_LIST_HEAD(&qobj
->qobj_list
);
419 init_waitqueue_head(&qobj
->thread_wq
);
420 spin_lock_init(&qobj
->cmd_queue_lock
);
422 EXPORT_SYMBOL(transport_init_queue_obj
);
424 static int transport_subsystem_reqmods(void)
428 ret
= request_module("target_core_iblock");
430 printk(KERN_ERR
"Unable to load target_core_iblock\n");
432 ret
= request_module("target_core_file");
434 printk(KERN_ERR
"Unable to load target_core_file\n");
436 ret
= request_module("target_core_pscsi");
438 printk(KERN_ERR
"Unable to load target_core_pscsi\n");
440 ret
= request_module("target_core_stgt");
442 printk(KERN_ERR
"Unable to load target_core_stgt\n");
447 int transport_subsystem_check_init(void)
449 if (se_global
->g_sub_api_initialized
)
452 * Request the loading of known TCM subsystem plugins..
454 if (transport_subsystem_reqmods() < 0)
457 se_global
->g_sub_api_initialized
= 1;
461 struct se_session
*transport_init_session(void)
463 struct se_session
*se_sess
;
465 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
467 printk(KERN_ERR
"Unable to allocate struct se_session from"
469 return ERR_PTR(-ENOMEM
);
471 INIT_LIST_HEAD(&se_sess
->sess_list
);
472 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
476 EXPORT_SYMBOL(transport_init_session
);
479 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
481 void __transport_register_session(
482 struct se_portal_group
*se_tpg
,
483 struct se_node_acl
*se_nacl
,
484 struct se_session
*se_sess
,
485 void *fabric_sess_ptr
)
487 unsigned char buf
[PR_REG_ISID_LEN
];
489 se_sess
->se_tpg
= se_tpg
;
490 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
492 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
494 * Only set for struct se_session's that will actually be moving I/O.
495 * eg: *NOT* discovery sessions.
499 * If the fabric module supports an ISID based TransportID,
500 * save this value in binary from the fabric I_T Nexus now.
502 if (TPG_TFO(se_tpg
)->sess_get_initiator_sid
!= NULL
) {
503 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
504 TPG_TFO(se_tpg
)->sess_get_initiator_sid(se_sess
,
505 &buf
[0], PR_REG_ISID_LEN
);
506 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
508 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
510 * The se_nacl->nacl_sess pointer will be set to the
511 * last active I_T Nexus for each struct se_node_acl.
513 se_nacl
->nacl_sess
= se_sess
;
515 list_add_tail(&se_sess
->sess_acl_list
,
516 &se_nacl
->acl_sess_list
);
517 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
519 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
521 printk(KERN_INFO
"TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
522 TPG_TFO(se_tpg
)->get_fabric_name(), se_sess
->fabric_sess_ptr
);
524 EXPORT_SYMBOL(__transport_register_session
);
526 void transport_register_session(
527 struct se_portal_group
*se_tpg
,
528 struct se_node_acl
*se_nacl
,
529 struct se_session
*se_sess
,
530 void *fabric_sess_ptr
)
532 spin_lock_bh(&se_tpg
->session_lock
);
533 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
534 spin_unlock_bh(&se_tpg
->session_lock
);
536 EXPORT_SYMBOL(transport_register_session
);
538 void transport_deregister_session_configfs(struct se_session
*se_sess
)
540 struct se_node_acl
*se_nacl
;
543 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
545 se_nacl
= se_sess
->se_node_acl
;
547 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
548 list_del(&se_sess
->sess_acl_list
);
550 * If the session list is empty, then clear the pointer.
551 * Otherwise, set the struct se_session pointer from the tail
552 * element of the per struct se_node_acl active session list.
554 if (list_empty(&se_nacl
->acl_sess_list
))
555 se_nacl
->nacl_sess
= NULL
;
557 se_nacl
->nacl_sess
= container_of(
558 se_nacl
->acl_sess_list
.prev
,
559 struct se_session
, sess_acl_list
);
561 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
564 EXPORT_SYMBOL(transport_deregister_session_configfs
);
566 void transport_free_session(struct se_session
*se_sess
)
568 kmem_cache_free(se_sess_cache
, se_sess
);
570 EXPORT_SYMBOL(transport_free_session
);
572 void transport_deregister_session(struct se_session
*se_sess
)
574 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
575 struct se_node_acl
*se_nacl
;
578 transport_free_session(se_sess
);
582 spin_lock_bh(&se_tpg
->session_lock
);
583 list_del(&se_sess
->sess_list
);
584 se_sess
->se_tpg
= NULL
;
585 se_sess
->fabric_sess_ptr
= NULL
;
586 spin_unlock_bh(&se_tpg
->session_lock
);
589 * Determine if we need to do extra work for this initiator node's
590 * struct se_node_acl if it had been previously dynamically generated.
592 se_nacl
= se_sess
->se_node_acl
;
594 spin_lock_bh(&se_tpg
->acl_node_lock
);
595 if (se_nacl
->dynamic_node_acl
) {
596 if (!(TPG_TFO(se_tpg
)->tpg_check_demo_mode_cache(
598 list_del(&se_nacl
->acl_list
);
599 se_tpg
->num_node_acls
--;
600 spin_unlock_bh(&se_tpg
->acl_node_lock
);
602 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
603 core_free_device_list_for_node(se_nacl
, se_tpg
);
604 TPG_TFO(se_tpg
)->tpg_release_fabric_acl(se_tpg
,
606 spin_lock_bh(&se_tpg
->acl_node_lock
);
609 spin_unlock_bh(&se_tpg
->acl_node_lock
);
612 transport_free_session(se_sess
);
614 printk(KERN_INFO
"TARGET_CORE[%s]: Deregistered fabric_sess\n",
615 TPG_TFO(se_tpg
)->get_fabric_name());
617 EXPORT_SYMBOL(transport_deregister_session
);
620 * Called with T_TASK(cmd)->t_state_lock held.
622 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
624 struct se_device
*dev
;
625 struct se_task
*task
;
631 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
636 if (atomic_read(&task
->task_active
))
639 if (!(atomic_read(&task
->task_state_active
)))
642 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
643 list_del(&task
->t_state_list
);
644 DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n",
645 CMD_TFO(cmd
)->tfo_get_task_tag(cmd
), dev
, task
);
646 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
648 atomic_set(&task
->task_state_active
, 0);
649 atomic_dec(&T_TASK(cmd
)->t_task_cdbs_ex_left
);
653 /* transport_cmd_check_stop():
655 * 'transport_off = 1' determines if t_transport_active should be cleared.
656 * 'transport_off = 2' determines if task_dev_state should be removed.
658 * A non-zero u8 t_state sets cmd->t_state.
659 * Returns 1 when command is stopped, else 0.
661 static int transport_cmd_check_stop(
668 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
670 * Determine if IOCTL context caller in requesting the stopping of this
671 * command for LUN shutdown purposes.
673 if (atomic_read(&T_TASK(cmd
)->transport_lun_stop
)) {
674 DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->transport_lun_stop)"
675 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
676 CMD_TFO(cmd
)->get_task_tag(cmd
));
678 cmd
->deferred_t_state
= cmd
->t_state
;
679 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
680 atomic_set(&T_TASK(cmd
)->t_transport_active
, 0);
681 if (transport_off
== 2)
682 transport_all_task_dev_remove_state(cmd
);
683 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
685 complete(&T_TASK(cmd
)->transport_lun_stop_comp
);
689 * Determine if frontend context caller is requesting the stopping of
690 * this command for frontend excpections.
692 if (atomic_read(&T_TASK(cmd
)->t_transport_stop
)) {
693 DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->t_transport_stop) =="
694 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
695 CMD_TFO(cmd
)->get_task_tag(cmd
));
697 cmd
->deferred_t_state
= cmd
->t_state
;
698 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
699 if (transport_off
== 2)
700 transport_all_task_dev_remove_state(cmd
);
703 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
706 if (transport_off
== 2)
708 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
710 complete(&T_TASK(cmd
)->t_transport_stop_comp
);
714 atomic_set(&T_TASK(cmd
)->t_transport_active
, 0);
715 if (transport_off
== 2) {
716 transport_all_task_dev_remove_state(cmd
);
718 * Clear struct se_cmd->se_lun before the transport_off == 2
719 * handoff to fabric module.
723 * Some fabric modules like tcm_loop can release
724 * their internally allocated I/O refrence now and
727 if (CMD_TFO(cmd
)->check_stop_free
!= NULL
) {
728 spin_unlock_irqrestore(
729 &T_TASK(cmd
)->t_state_lock
, flags
);
731 CMD_TFO(cmd
)->check_stop_free(cmd
);
735 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
739 cmd
->t_state
= t_state
;
740 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
745 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
747 return transport_cmd_check_stop(cmd
, 2, 0);
750 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
752 struct se_lun
*lun
= SE_LUN(cmd
);
758 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
759 if (!(atomic_read(&T_TASK(cmd
)->transport_dev_active
))) {
760 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
763 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 0);
764 transport_all_task_dev_remove_state(cmd
);
765 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
767 transport_free_dev_tasks(cmd
);
770 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
771 if (atomic_read(&T_TASK(cmd
)->transport_lun_active
)) {
772 list_del(&cmd
->se_lun_list
);
773 atomic_set(&T_TASK(cmd
)->transport_lun_active
, 0);
775 printk(KERN_INFO
"Removed ITT: 0x%08x from LUN LIST[%d]\n"
776 CMD_TFO(cmd
)->get_task_tag(cmd
), lun
->unpacked_lun
);
779 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
782 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
784 transport_remove_cmd_from_queue(cmd
, SE_DEV(cmd
)->dev_queue_obj
);
785 transport_lun_remove_cmd(cmd
);
787 if (transport_cmd_check_stop_to_fabric(cmd
))
790 transport_generic_remove(cmd
, 0, 0);
793 void transport_cmd_finish_abort_tmr(struct se_cmd
*cmd
)
795 transport_remove_cmd_from_queue(cmd
, SE_DEV(cmd
)->dev_queue_obj
);
797 if (transport_cmd_check_stop_to_fabric(cmd
))
800 transport_generic_remove(cmd
, 0, 0);
803 static int transport_add_cmd_to_queue(
807 struct se_device
*dev
= cmd
->se_dev
;
808 struct se_queue_obj
*qobj
= dev
->dev_queue_obj
;
809 struct se_queue_req
*qr
;
812 qr
= kzalloc(sizeof(struct se_queue_req
), GFP_ATOMIC
);
814 printk(KERN_ERR
"Unable to allocate memory for"
815 " struct se_queue_req\n");
818 INIT_LIST_HEAD(&qr
->qr_list
);
820 qr
->cmd
= (void *)cmd
;
824 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
825 cmd
->t_state
= t_state
;
826 atomic_set(&T_TASK(cmd
)->t_transport_active
, 1);
827 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
830 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
831 list_add_tail(&qr
->qr_list
, &qobj
->qobj_list
);
832 atomic_inc(&T_TASK(cmd
)->t_transport_queue_active
);
833 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
835 atomic_inc(&qobj
->queue_cnt
);
836 wake_up_interruptible(&qobj
->thread_wq
);
841 * Called with struct se_queue_obj->cmd_queue_lock held.
843 static struct se_queue_req
*
844 __transport_get_qr_from_queue(struct se_queue_obj
*qobj
)
847 struct se_queue_req
*qr
= NULL
;
849 if (list_empty(&qobj
->qobj_list
))
852 list_for_each_entry(qr
, &qobj
->qobj_list
, qr_list
)
856 cmd
= (struct se_cmd
*)qr
->cmd
;
857 atomic_dec(&T_TASK(cmd
)->t_transport_queue_active
);
859 list_del(&qr
->qr_list
);
860 atomic_dec(&qobj
->queue_cnt
);
865 static struct se_queue_req
*
866 transport_get_qr_from_queue(struct se_queue_obj
*qobj
)
869 struct se_queue_req
*qr
;
872 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
873 if (list_empty(&qobj
->qobj_list
)) {
874 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
878 list_for_each_entry(qr
, &qobj
->qobj_list
, qr_list
)
882 cmd
= (struct se_cmd
*)qr
->cmd
;
883 atomic_dec(&T_TASK(cmd
)->t_transport_queue_active
);
885 list_del(&qr
->qr_list
);
886 atomic_dec(&qobj
->queue_cnt
);
887 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
892 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
893 struct se_queue_obj
*qobj
)
895 struct se_cmd
*q_cmd
;
896 struct se_queue_req
*qr
= NULL
, *qr_p
= NULL
;
899 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
900 if (!(atomic_read(&T_TASK(cmd
)->t_transport_queue_active
))) {
901 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
905 list_for_each_entry_safe(qr
, qr_p
, &qobj
->qobj_list
, qr_list
) {
906 q_cmd
= (struct se_cmd
*)qr
->cmd
;
910 atomic_dec(&T_TASK(q_cmd
)->t_transport_queue_active
);
911 atomic_dec(&qobj
->queue_cnt
);
912 list_del(&qr
->qr_list
);
915 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
917 if (atomic_read(&T_TASK(cmd
)->t_transport_queue_active
)) {
918 printk(KERN_ERR
"ITT: 0x%08x t_transport_queue_active: %d\n",
919 CMD_TFO(cmd
)->get_task_tag(cmd
),
920 atomic_read(&T_TASK(cmd
)->t_transport_queue_active
));
925 * Completion function used by TCM subsystem plugins (such as FILEIO)
926 * for queueing up response from struct se_subsystem_api->do_task()
928 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
930 struct se_task
*task
= list_entry(T_TASK(cmd
)->t_task_list
.next
,
931 struct se_task
, t_list
);
934 cmd
->scsi_status
= SAM_STAT_GOOD
;
935 task
->task_scsi_status
= GOOD
;
937 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
938 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
939 TASK_CMD(task
)->transport_error_status
=
940 PYX_TRANSPORT_ILLEGAL_REQUEST
;
943 transport_complete_task(task
, good
);
945 EXPORT_SYMBOL(transport_complete_sync_cache
);
947 /* transport_complete_task():
949 * Called from interrupt and non interrupt context depending
950 * on the transport plugin.
952 void transport_complete_task(struct se_task
*task
, int success
)
954 struct se_cmd
*cmd
= TASK_CMD(task
);
955 struct se_device
*dev
= task
->se_dev
;
959 printk(KERN_INFO
"task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
960 T_TASK(cmd
)->t_task_cdb
[0], dev
);
963 spin_lock_irqsave(&SE_HBA(dev
)->hba_queue_lock
, flags
);
964 atomic_inc(&dev
->depth_left
);
965 atomic_inc(&SE_HBA(dev
)->left_queue_depth
);
966 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
969 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
970 atomic_set(&task
->task_active
, 0);
973 * See if any sense data exists, if so set the TASK_SENSE flag.
974 * Also check for any other post completion work that needs to be
975 * done by the plugins.
977 if (dev
&& dev
->transport
->transport_complete
) {
978 if (dev
->transport
->transport_complete(task
) != 0) {
979 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
980 task
->task_sense
= 1;
986 * See if we are waiting for outstanding struct se_task
987 * to complete for an exception condition
989 if (atomic_read(&task
->task_stop
)) {
991 * Decrement T_TASK(cmd)->t_se_count if this task had
992 * previously thrown its timeout exception handler.
994 if (atomic_read(&task
->task_timeout
)) {
995 atomic_dec(&T_TASK(cmd
)->t_se_count
);
996 atomic_set(&task
->task_timeout
, 0);
998 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1000 complete(&task
->task_stop_comp
);
1004 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
1005 * left counter to determine when the struct se_cmd is ready to be queued to
1006 * the processing thread.
1008 if (atomic_read(&task
->task_timeout
)) {
1009 if (!(atomic_dec_and_test(
1010 &T_TASK(cmd
)->t_task_cdbs_timeout_left
))) {
1011 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
1015 t_state
= TRANSPORT_COMPLETE_TIMEOUT
;
1016 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1018 transport_add_cmd_to_queue(cmd
, t_state
);
1021 atomic_dec(&T_TASK(cmd
)->t_task_cdbs_timeout_left
);
1024 * Decrement the outstanding t_task_cdbs_left count. The last
1025 * struct se_task from struct se_cmd will complete itself into the
1026 * device queue depending upon int success.
1028 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_task_cdbs_left
))) {
1030 T_TASK(cmd
)->t_tasks_failed
= 1;
1032 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1036 if (!success
|| T_TASK(cmd
)->t_tasks_failed
) {
1037 t_state
= TRANSPORT_COMPLETE_FAILURE
;
1038 if (!task
->task_error_status
) {
1039 task
->task_error_status
=
1040 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
1041 cmd
->transport_error_status
=
1042 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
1045 atomic_set(&T_TASK(cmd
)->t_transport_complete
, 1);
1046 t_state
= TRANSPORT_COMPLETE_OK
;
1048 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1050 transport_add_cmd_to_queue(cmd
, t_state
);
1052 EXPORT_SYMBOL(transport_complete_task
);
1055 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
1056 * struct se_task list are ready to be added to the active execution list
1059 * Called with se_dev_t->execute_task_lock called.
1061 static inline int transport_add_task_check_sam_attr(
1062 struct se_task
*task
,
1063 struct se_task
*task_prev
,
1064 struct se_device
*dev
)
1067 * No SAM Task attribute emulation enabled, add to tail of
1070 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
1071 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
1075 * HEAD_OF_QUEUE attribute for received CDB, which means
1076 * the first task that is associated with a struct se_cmd goes to
1077 * head of the struct se_device->execute_task_list, and task_prev
1078 * after that for each subsequent task
1080 if (task
->task_se_cmd
->sam_task_attr
== TASK_ATTR_HOQ
) {
1081 list_add(&task
->t_execute_list
,
1082 (task_prev
!= NULL
) ?
1083 &task_prev
->t_execute_list
:
1084 &dev
->execute_task_list
);
1086 DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
1087 " in execution queue\n",
1088 T_TASK(task
->task_se_cmd
)->t_task_cdb
[0]);
1092 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
1093 * transitioned from Dermant -> Active state, and are added to the end
1094 * of the struct se_device->execute_task_list
1096 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
1100 /* __transport_add_task_to_execute_queue():
1102 * Called with se_dev_t->execute_task_lock called.
1104 static void __transport_add_task_to_execute_queue(
1105 struct se_task
*task
,
1106 struct se_task
*task_prev
,
1107 struct se_device
*dev
)
1111 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
1112 atomic_inc(&dev
->execute_tasks
);
1114 if (atomic_read(&task
->task_state_active
))
1117 * Determine if this task needs to go to HEAD_OF_QUEUE for the
1118 * state list as well. Running with SAM Task Attribute emulation
1119 * will always return head_of_queue == 0 here
1122 list_add(&task
->t_state_list
, (task_prev
) ?
1123 &task_prev
->t_state_list
:
1124 &dev
->state_task_list
);
1126 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
1128 atomic_set(&task
->task_state_active
, 1);
1130 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1131 CMD_TFO(task
->task_se_cmd
)->get_task_tag(task
->task_se_cmd
),
1135 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
1137 struct se_device
*dev
;
1138 struct se_task
*task
;
1139 unsigned long flags
;
1141 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
1142 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
1145 if (atomic_read(&task
->task_state_active
))
1148 spin_lock(&dev
->execute_task_lock
);
1149 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
1150 atomic_set(&task
->task_state_active
, 1);
1152 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1153 CMD_TFO(task
->task_se_cmd
)->get_task_tag(
1154 task
->task_se_cmd
), task
, dev
);
1156 spin_unlock(&dev
->execute_task_lock
);
1158 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1161 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
1163 struct se_device
*dev
= SE_DEV(cmd
);
1164 struct se_task
*task
, *task_prev
= NULL
;
1165 unsigned long flags
;
1167 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
1168 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
1169 if (atomic_read(&task
->task_execute_queue
))
1172 * __transport_add_task_to_execute_queue() handles the
1173 * SAM Task Attribute emulation if enabled
1175 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
1176 atomic_set(&task
->task_execute_queue
, 1);
1179 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
1184 /* transport_get_task_from_execute_queue():
1186 * Called with dev->execute_task_lock held.
1188 static struct se_task
*
1189 transport_get_task_from_execute_queue(struct se_device
*dev
)
1191 struct se_task
*task
;
1193 if (list_empty(&dev
->execute_task_list
))
1196 list_for_each_entry(task
, &dev
->execute_task_list
, t_execute_list
)
1199 list_del(&task
->t_execute_list
);
1200 atomic_dec(&dev
->execute_tasks
);
1205 /* transport_remove_task_from_execute_queue():
1209 void transport_remove_task_from_execute_queue(
1210 struct se_task
*task
,
1211 struct se_device
*dev
)
1213 unsigned long flags
;
1215 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
1216 list_del(&task
->t_execute_list
);
1217 atomic_dec(&dev
->execute_tasks
);
1218 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
1221 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
1223 switch (cmd
->data_direction
) {
1226 case DMA_FROM_DEVICE
:
1230 case DMA_BIDIRECTIONAL
:
1239 void transport_dump_dev_state(
1240 struct se_device
*dev
,
1244 *bl
+= sprintf(b
+ *bl
, "Status: ");
1245 switch (dev
->dev_status
) {
1246 case TRANSPORT_DEVICE_ACTIVATED
:
1247 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1249 case TRANSPORT_DEVICE_DEACTIVATED
:
1250 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1252 case TRANSPORT_DEVICE_SHUTDOWN
:
1253 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1255 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1256 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1257 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1260 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1264 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1265 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1267 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1268 DEV_ATTRIB(dev
)->block_size
, DEV_ATTRIB(dev
)->max_sectors
);
1269 *bl
+= sprintf(b
+ *bl
, " ");
1272 /* transport_release_all_cmds():
1276 static void transport_release_all_cmds(struct se_device
*dev
)
1278 struct se_cmd
*cmd
= NULL
;
1279 struct se_queue_req
*qr
= NULL
, *qr_p
= NULL
;
1280 int bug_out
= 0, t_state
;
1281 unsigned long flags
;
1283 spin_lock_irqsave(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
1284 list_for_each_entry_safe(qr
, qr_p
, &dev
->dev_queue_obj
->qobj_list
,
1287 cmd
= (struct se_cmd
*)qr
->cmd
;
1288 t_state
= qr
->state
;
1289 list_del(&qr
->qr_list
);
1291 spin_unlock_irqrestore(&dev
->dev_queue_obj
->cmd_queue_lock
,
1294 printk(KERN_ERR
"Releasing ITT: 0x%08x, i_state: %u,"
1295 " t_state: %u directly\n",
1296 CMD_TFO(cmd
)->get_task_tag(cmd
),
1297 CMD_TFO(cmd
)->get_cmd_state(cmd
), t_state
);
1299 transport_release_fe_cmd(cmd
);
1302 spin_lock_irqsave(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
1304 spin_unlock_irqrestore(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
1311 void transport_dump_vpd_proto_id(
1312 struct t10_vpd
*vpd
,
1313 unsigned char *p_buf
,
1316 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1319 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1320 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1322 switch (vpd
->protocol_identifier
) {
1324 sprintf(buf
+len
, "Fibre Channel\n");
1327 sprintf(buf
+len
, "Parallel SCSI\n");
1330 sprintf(buf
+len
, "SSA\n");
1333 sprintf(buf
+len
, "IEEE 1394\n");
1336 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1340 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1343 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1346 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1350 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1353 sprintf(buf
+len
, "Unknown 0x%02x\n",
1354 vpd
->protocol_identifier
);
1359 strncpy(p_buf
, buf
, p_buf_len
);
1361 printk(KERN_INFO
"%s", buf
);
1365 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1368 * Check if the Protocol Identifier Valid (PIV) bit is set..
1370 * from spc3r23.pdf section 7.5.1
1372 if (page_83
[1] & 0x80) {
1373 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1374 vpd
->protocol_identifier_set
= 1;
1375 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1378 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1380 int transport_dump_vpd_assoc(
1381 struct t10_vpd
*vpd
,
1382 unsigned char *p_buf
,
1385 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1388 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1389 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1391 switch (vpd
->association
) {
1393 sprintf(buf
+len
, "addressed logical unit\n");
1396 sprintf(buf
+len
, "target port\n");
1399 sprintf(buf
+len
, "SCSI target device\n");
1402 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1408 strncpy(p_buf
, buf
, p_buf_len
);
1415 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1418 * The VPD identification association..
1420 * from spc3r23.pdf Section 7.6.3.1 Table 297
1422 vpd
->association
= (page_83
[1] & 0x30);
1423 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1425 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1427 int transport_dump_vpd_ident_type(
1428 struct t10_vpd
*vpd
,
1429 unsigned char *p_buf
,
1432 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1435 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1436 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1438 switch (vpd
->device_identifier_type
) {
1440 sprintf(buf
+len
, "Vendor specific\n");
1443 sprintf(buf
+len
, "T10 Vendor ID based\n");
1446 sprintf(buf
+len
, "EUI-64 based\n");
1449 sprintf(buf
+len
, "NAA\n");
1452 sprintf(buf
+len
, "Relative target port identifier\n");
1455 sprintf(buf
+len
, "SCSI name string\n");
1458 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1459 vpd
->device_identifier_type
);
1465 strncpy(p_buf
, buf
, p_buf_len
);
1472 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1475 * The VPD identifier type..
1477 * from spc3r23.pdf Section 7.6.3.1 Table 298
1479 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1480 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1482 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1484 int transport_dump_vpd_ident(
1485 struct t10_vpd
*vpd
,
1486 unsigned char *p_buf
,
1489 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1492 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1494 switch (vpd
->device_identifier_code_set
) {
1495 case 0x01: /* Binary */
1496 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1497 &vpd
->device_identifier
[0]);
1499 case 0x02: /* ASCII */
1500 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1501 &vpd
->device_identifier
[0]);
1503 case 0x03: /* UTF-8 */
1504 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1505 &vpd
->device_identifier
[0]);
1508 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1509 " 0x%02x", vpd
->device_identifier_code_set
);
1515 strncpy(p_buf
, buf
, p_buf_len
);
1523 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1525 static const char hex_str
[] = "0123456789abcdef";
1526 int j
= 0, i
= 4; /* offset to start of the identifer */
1529 * The VPD Code Set (encoding)
1531 * from spc3r23.pdf Section 7.6.3.1 Table 296
1533 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1534 switch (vpd
->device_identifier_code_set
) {
1535 case 0x01: /* Binary */
1536 vpd
->device_identifier
[j
++] =
1537 hex_str
[vpd
->device_identifier_type
];
1538 while (i
< (4 + page_83
[3])) {
1539 vpd
->device_identifier
[j
++] =
1540 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1541 vpd
->device_identifier
[j
++] =
1542 hex_str
[page_83
[i
] & 0x0f];
1546 case 0x02: /* ASCII */
1547 case 0x03: /* UTF-8 */
1548 while (i
< (4 + page_83
[3]))
1549 vpd
->device_identifier
[j
++] = page_83
[i
++];
1555 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1557 EXPORT_SYMBOL(transport_set_vpd_ident
);
1559 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1562 * If this device is from Target_Core_Mod/pSCSI, disable the
1563 * SAM Task Attribute emulation.
1565 * This is currently not available in upsream Linux/SCSI Target
1566 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1568 if (TRANSPORT(dev
)->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1569 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1573 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1574 DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1575 " device\n", TRANSPORT(dev
)->name
,
1576 TRANSPORT(dev
)->get_device_rev(dev
));
1579 static void scsi_dump_inquiry(struct se_device
*dev
)
1581 struct t10_wwn
*wwn
= DEV_T10_WWN(dev
);
1584 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1586 printk(" Vendor: ");
1587 for (i
= 0; i
< 8; i
++)
1588 if (wwn
->vendor
[i
] >= 0x20)
1589 printk("%c", wwn
->vendor
[i
]);
1594 for (i
= 0; i
< 16; i
++)
1595 if (wwn
->model
[i
] >= 0x20)
1596 printk("%c", wwn
->model
[i
]);
1600 printk(" Revision: ");
1601 for (i
= 0; i
< 4; i
++)
1602 if (wwn
->revision
[i
] >= 0x20)
1603 printk("%c", wwn
->revision
[i
]);
1609 device_type
= TRANSPORT(dev
)->get_device_type(dev
);
1610 printk(" Type: %s ", scsi_device_type(device_type
));
1611 printk(" ANSI SCSI revision: %02x\n",
1612 TRANSPORT(dev
)->get_device_rev(dev
));
1615 struct se_device
*transport_add_device_to_core_hba(
1617 struct se_subsystem_api
*transport
,
1618 struct se_subsystem_dev
*se_dev
,
1620 void *transport_dev
,
1621 struct se_dev_limits
*dev_limits
,
1622 const char *inquiry_prod
,
1623 const char *inquiry_rev
)
1625 int ret
= 0, force_pt
;
1626 struct se_device
*dev
;
1628 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1630 printk(KERN_ERR
"Unable to allocate memory for se_dev_t\n");
1633 dev
->dev_queue_obj
= kzalloc(sizeof(struct se_queue_obj
), GFP_KERNEL
);
1634 if (!(dev
->dev_queue_obj
)) {
1635 printk(KERN_ERR
"Unable to allocate memory for"
1636 " dev->dev_queue_obj\n");
1640 transport_init_queue_obj(dev
->dev_queue_obj
);
1642 dev
->dev_status_queue_obj
= kzalloc(sizeof(struct se_queue_obj
),
1644 if (!(dev
->dev_status_queue_obj
)) {
1645 printk(KERN_ERR
"Unable to allocate memory for"
1646 " dev->dev_status_queue_obj\n");
1647 kfree(dev
->dev_queue_obj
);
1651 transport_init_queue_obj(dev
->dev_status_queue_obj
);
1653 dev
->dev_flags
= device_flags
;
1654 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1655 dev
->dev_ptr
= (void *) transport_dev
;
1657 dev
->se_sub_dev
= se_dev
;
1658 dev
->transport
= transport
;
1659 atomic_set(&dev
->active_cmds
, 0);
1660 INIT_LIST_HEAD(&dev
->dev_list
);
1661 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1662 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1663 INIT_LIST_HEAD(&dev
->execute_task_list
);
1664 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1665 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1666 INIT_LIST_HEAD(&dev
->state_task_list
);
1667 spin_lock_init(&dev
->execute_task_lock
);
1668 spin_lock_init(&dev
->delayed_cmd_lock
);
1669 spin_lock_init(&dev
->ordered_cmd_lock
);
1670 spin_lock_init(&dev
->state_task_lock
);
1671 spin_lock_init(&dev
->dev_alua_lock
);
1672 spin_lock_init(&dev
->dev_reservation_lock
);
1673 spin_lock_init(&dev
->dev_status_lock
);
1674 spin_lock_init(&dev
->dev_status_thr_lock
);
1675 spin_lock_init(&dev
->se_port_lock
);
1676 spin_lock_init(&dev
->se_tmr_lock
);
1678 dev
->queue_depth
= dev_limits
->queue_depth
;
1679 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1680 atomic_set(&dev
->dev_ordered_id
, 0);
1682 se_dev_set_default_attribs(dev
, dev_limits
);
1684 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1685 dev
->creation_time
= get_jiffies_64();
1686 spin_lock_init(&dev
->stats_lock
);
1688 spin_lock(&hba
->device_lock
);
1689 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1691 spin_unlock(&hba
->device_lock
);
1693 * Setup the SAM Task Attribute emulation for struct se_device
1695 core_setup_task_attr_emulation(dev
);
1697 * Force PR and ALUA passthrough emulation with internal object use.
1699 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1701 * Setup the Reservations infrastructure for struct se_device
1703 core_setup_reservations(dev
, force_pt
);
1705 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1707 if (core_setup_alua(dev
, force_pt
) < 0)
1711 * Startup the struct se_device processing thread
1713 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1714 "LIO_%s", TRANSPORT(dev
)->name
);
1715 if (IS_ERR(dev
->process_thread
)) {
1716 printk(KERN_ERR
"Unable to create kthread: LIO_%s\n",
1717 TRANSPORT(dev
)->name
);
1722 * Preload the initial INQUIRY const values if we are doing
1723 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1724 * passthrough because this is being provided by the backend LLD.
1725 * This is required so that transport_get_inquiry() copies these
1726 * originals once back into DEV_T10_WWN(dev) for the virtual device
1729 if (TRANSPORT(dev
)->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1730 if (!(inquiry_prod
) || !(inquiry_prod
)) {
1731 printk(KERN_ERR
"All non TCM/pSCSI plugins require"
1732 " INQUIRY consts\n");
1736 strncpy(&DEV_T10_WWN(dev
)->vendor
[0], "LIO-ORG", 8);
1737 strncpy(&DEV_T10_WWN(dev
)->model
[0], inquiry_prod
, 16);
1738 strncpy(&DEV_T10_WWN(dev
)->revision
[0], inquiry_rev
, 4);
1740 scsi_dump_inquiry(dev
);
1745 kthread_stop(dev
->process_thread
);
1747 spin_lock(&hba
->device_lock
);
1748 list_del(&dev
->dev_list
);
1750 spin_unlock(&hba
->device_lock
);
1752 se_release_vpd_for_dev(dev
);
1754 kfree(dev
->dev_status_queue_obj
);
1755 kfree(dev
->dev_queue_obj
);
1760 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1762 /* transport_generic_prepare_cdb():
1764 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1765 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1766 * The point of this is since we are mapping iSCSI LUNs to
1767 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1768 * devices and HBAs for a loop.
1770 static inline void transport_generic_prepare_cdb(
1774 case READ_10
: /* SBC - RDProtect */
1775 case READ_12
: /* SBC - RDProtect */
1776 case READ_16
: /* SBC - RDProtect */
1777 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1778 case VERIFY
: /* SBC - VRProtect */
1779 case VERIFY_16
: /* SBC - VRProtect */
1780 case WRITE_VERIFY
: /* SBC - VRProtect */
1781 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1784 cdb
[1] &= 0x1f; /* clear logical unit number */
1789 static struct se_task
*
1790 transport_generic_get_task(struct se_cmd
*cmd
,
1791 enum dma_data_direction data_direction
)
1793 struct se_task
*task
;
1794 struct se_device
*dev
= SE_DEV(cmd
);
1795 unsigned long flags
;
1797 task
= dev
->transport
->alloc_task(cmd
);
1799 printk(KERN_ERR
"Unable to allocate struct se_task\n");
1803 INIT_LIST_HEAD(&task
->t_list
);
1804 INIT_LIST_HEAD(&task
->t_execute_list
);
1805 INIT_LIST_HEAD(&task
->t_state_list
);
1806 init_completion(&task
->task_stop_comp
);
1807 task
->task_no
= T_TASK(cmd
)->t_tasks_no
++;
1808 task
->task_se_cmd
= cmd
;
1810 task
->task_data_direction
= data_direction
;
1812 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
1813 list_add_tail(&task
->t_list
, &T_TASK(cmd
)->t_task_list
);
1814 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
1819 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1821 void transport_device_setup_cmd(struct se_cmd
*cmd
)
1823 cmd
->se_dev
= SE_LUN(cmd
)->lun_se_dev
;
1825 EXPORT_SYMBOL(transport_device_setup_cmd
);
1828 * Used by fabric modules containing a local struct se_cmd within their
1829 * fabric dependent per I/O descriptor.
1831 void transport_init_se_cmd(
1833 struct target_core_fabric_ops
*tfo
,
1834 struct se_session
*se_sess
,
1838 unsigned char *sense_buffer
)
1840 INIT_LIST_HEAD(&cmd
->se_lun_list
);
1841 INIT_LIST_HEAD(&cmd
->se_delayed_list
);
1842 INIT_LIST_HEAD(&cmd
->se_ordered_list
);
1844 * Setup t_task pointer to t_task_backstore
1846 cmd
->t_task
= &cmd
->t_task_backstore
;
1848 INIT_LIST_HEAD(&T_TASK(cmd
)->t_task_list
);
1849 init_completion(&T_TASK(cmd
)->transport_lun_fe_stop_comp
);
1850 init_completion(&T_TASK(cmd
)->transport_lun_stop_comp
);
1851 init_completion(&T_TASK(cmd
)->t_transport_stop_comp
);
1852 spin_lock_init(&T_TASK(cmd
)->t_state_lock
);
1853 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 1);
1856 cmd
->se_sess
= se_sess
;
1857 cmd
->data_length
= data_length
;
1858 cmd
->data_direction
= data_direction
;
1859 cmd
->sam_task_attr
= task_attr
;
1860 cmd
->sense_buffer
= sense_buffer
;
1862 EXPORT_SYMBOL(transport_init_se_cmd
);
1864 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1867 * Check if SAM Task Attribute emulation is enabled for this
1868 * struct se_device storage object
1870 if (SE_DEV(cmd
)->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1873 if (cmd
->sam_task_attr
== TASK_ATTR_ACA
) {
1874 DEBUG_STA("SAM Task Attribute ACA"
1875 " emulation is not supported\n");
1879 * Used to determine when ORDERED commands should go from
1880 * Dormant to Active status.
1882 cmd
->se_ordered_id
= atomic_inc_return(&SE_DEV(cmd
)->dev_ordered_id
);
1883 smp_mb__after_atomic_inc();
1884 DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1885 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1886 TRANSPORT(cmd
->se_dev
)->name
);
1890 void transport_free_se_cmd(
1891 struct se_cmd
*se_cmd
)
1893 if (se_cmd
->se_tmr_req
)
1894 core_tmr_release_req(se_cmd
->se_tmr_req
);
1896 * Check and free any extended CDB buffer that was allocated
1898 if (T_TASK(se_cmd
)->t_task_cdb
!= T_TASK(se_cmd
)->__t_task_cdb
)
1899 kfree(T_TASK(se_cmd
)->t_task_cdb
);
1901 EXPORT_SYMBOL(transport_free_se_cmd
);
1903 static void transport_generic_wait_for_tasks(struct se_cmd
*, int, int);
1905 /* transport_generic_allocate_tasks():
1907 * Called from fabric RX Thread.
1909 int transport_generic_allocate_tasks(
1915 transport_generic_prepare_cdb(cdb
);
1918 * This is needed for early exceptions.
1920 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1922 transport_device_setup_cmd(cmd
);
1924 * Ensure that the received CDB is less than the max (252 + 8) bytes
1925 * for VARIABLE_LENGTH_CMD
1927 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1928 printk(KERN_ERR
"Received SCSI CDB with command_size: %d that"
1929 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1930 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1934 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1935 * allocate the additional extended CDB buffer now.. Otherwise
1936 * setup the pointer from __t_task_cdb to t_task_cdb.
1938 if (scsi_command_size(cdb
) > sizeof(T_TASK(cmd
)->__t_task_cdb
)) {
1939 T_TASK(cmd
)->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1941 if (!(T_TASK(cmd
)->t_task_cdb
)) {
1942 printk(KERN_ERR
"Unable to allocate T_TASK(cmd)->t_task_cdb"
1943 " %u > sizeof(T_TASK(cmd)->__t_task_cdb): %lu ops\n",
1944 scsi_command_size(cdb
),
1945 (unsigned long)sizeof(T_TASK(cmd
)->__t_task_cdb
));
1949 T_TASK(cmd
)->t_task_cdb
= &T_TASK(cmd
)->__t_task_cdb
[0];
1951 * Copy the original CDB into T_TASK(cmd).
1953 memcpy(T_TASK(cmd
)->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1955 * Setup the received CDB based on SCSI defined opcodes and
1956 * perform unit attention, persistent reservations and ALUA
1957 * checks for virtual device backends. The T_TASK(cmd)->t_task_cdb
1958 * pointer is expected to be setup before we reach this point.
1960 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1964 * Check for SAM Task Attribute Emulation
1966 if (transport_check_alloc_task_attr(cmd
) < 0) {
1967 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1968 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1971 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1972 if (cmd
->se_lun
->lun_sep
)
1973 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1974 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1977 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1980 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1981 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1983 int transport_generic_handle_cdb(
1988 printk(KERN_ERR
"SE_LUN(cmd) is NULL\n");
1992 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD
);
1995 EXPORT_SYMBOL(transport_generic_handle_cdb
);
1998 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1999 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
2000 * complete setup in TCM process context w/ TFO->new_cmd_map().
2002 int transport_generic_handle_cdb_map(
2007 printk(KERN_ERR
"SE_LUN(cmd) is NULL\n");
2011 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
);
2014 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
2016 /* transport_generic_handle_data():
2020 int transport_generic_handle_data(
2024 * For the software fabric case, then we assume the nexus is being
2025 * failed/shutdown when signals are pending from the kthread context
2026 * caller, so we return a failure. For the HW target mode case running
2027 * in interrupt code, the signal_pending() check is skipped.
2029 if (!in_interrupt() && signal_pending(current
))
2032 * If the received CDB has aleady been ABORTED by the generic
2033 * target engine, we now call transport_check_aborted_status()
2034 * to queue any delated TASK_ABORTED status for the received CDB to the
2035 * fabric module as we are expecting no futher incoming DATA OUT
2036 * sequences at this point.
2038 if (transport_check_aborted_status(cmd
, 1) != 0)
2041 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
);
2044 EXPORT_SYMBOL(transport_generic_handle_data
);
2046 /* transport_generic_handle_tmr():
2050 int transport_generic_handle_tmr(
2054 * This is needed for early exceptions.
2056 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
2057 transport_device_setup_cmd(cmd
);
2059 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
);
2062 EXPORT_SYMBOL(transport_generic_handle_tmr
);
2064 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
2066 struct se_task
*task
, *task_tmp
;
2067 unsigned long flags
;
2070 DEBUG_TS("ITT[0x%08x] - Stopping tasks\n",
2071 CMD_TFO(cmd
)->get_task_tag(cmd
));
2074 * No tasks remain in the execution queue
2076 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2077 list_for_each_entry_safe(task
, task_tmp
,
2078 &T_TASK(cmd
)->t_task_list
, t_list
) {
2079 DEBUG_TS("task_no[%d] - Processing task %p\n",
2080 task
->task_no
, task
);
2082 * If the struct se_task has not been sent and is not active,
2083 * remove the struct se_task from the execution queue.
2085 if (!atomic_read(&task
->task_sent
) &&
2086 !atomic_read(&task
->task_active
)) {
2087 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
2089 transport_remove_task_from_execute_queue(task
,
2092 DEBUG_TS("task_no[%d] - Removed from execute queue\n",
2094 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2099 * If the struct se_task is active, sleep until it is returned
2102 if (atomic_read(&task
->task_active
)) {
2103 atomic_set(&task
->task_stop
, 1);
2104 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
2107 DEBUG_TS("task_no[%d] - Waiting to complete\n",
2109 wait_for_completion(&task
->task_stop_comp
);
2110 DEBUG_TS("task_no[%d] - Stopped successfully\n",
2113 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2114 atomic_dec(&T_TASK(cmd
)->t_task_cdbs_left
);
2116 atomic_set(&task
->task_active
, 0);
2117 atomic_set(&task
->task_stop
, 0);
2119 DEBUG_TS("task_no[%d] - Did nothing\n", task
->task_no
);
2123 __transport_stop_task_timer(task
, &flags
);
2125 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2130 static void transport_failure_reset_queue_depth(struct se_device
*dev
)
2132 unsigned long flags
;
2134 spin_lock_irqsave(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2135 atomic_inc(&dev
->depth_left
);
2136 atomic_inc(&SE_HBA(dev
)->left_queue_depth
);
2137 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2141 * Handle SAM-esque emulation for generic transport request failures.
2143 static void transport_generic_request_failure(
2145 struct se_device
*dev
,
2149 DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
2150 " CDB: 0x%02x\n", cmd
, CMD_TFO(cmd
)->get_task_tag(cmd
),
2151 T_TASK(cmd
)->t_task_cdb
[0]);
2152 DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:"
2153 " %d/%d transport_error_status: %d\n",
2154 CMD_TFO(cmd
)->get_cmd_state(cmd
),
2155 cmd
->t_state
, cmd
->deferred_t_state
,
2156 cmd
->transport_error_status
);
2157 DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d"
2158 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
2159 " t_transport_active: %d t_transport_stop: %d"
2160 " t_transport_sent: %d\n", T_TASK(cmd
)->t_task_cdbs
,
2161 atomic_read(&T_TASK(cmd
)->t_task_cdbs_left
),
2162 atomic_read(&T_TASK(cmd
)->t_task_cdbs_sent
),
2163 atomic_read(&T_TASK(cmd
)->t_task_cdbs_ex_left
),
2164 atomic_read(&T_TASK(cmd
)->t_transport_active
),
2165 atomic_read(&T_TASK(cmd
)->t_transport_stop
),
2166 atomic_read(&T_TASK(cmd
)->t_transport_sent
));
2168 transport_stop_all_task_timers(cmd
);
2171 transport_failure_reset_queue_depth(dev
);
2173 * For SAM Task Attribute emulation for failed struct se_cmd
2175 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2176 transport_complete_task_attr(cmd
);
2179 transport_direct_request_timeout(cmd
);
2180 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2183 switch (cmd
->transport_error_status
) {
2184 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
2185 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
2187 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
2188 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
2190 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
2191 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
2193 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
2194 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
2196 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
2198 transport_new_cmd_failure(cmd
);
2200 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2201 * we force this session to fall back to session
2204 CMD_TFO(cmd
)->fall_back_to_erl0(cmd
->se_sess
);
2205 CMD_TFO(cmd
)->stop_session(cmd
->se_sess
, 0, 0);
2208 case PYX_TRANSPORT_LU_COMM_FAILURE
:
2209 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
2210 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2212 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
2213 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
2215 case PYX_TRANSPORT_WRITE_PROTECTED
:
2216 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
2218 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
2220 * No SENSE Data payload for this case, set SCSI Status
2221 * and queue the response to $FABRIC_MOD.
2223 * Uses linux/include/scsi/scsi.h SAM status codes defs
2225 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2227 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2228 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2231 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2234 DEV_ATTRIB(cmd
->se_dev
)->emulate_ua_intlck_ctrl
== 2)
2235 core_scsi3_ua_allocate(SE_SESS(cmd
)->se_node_acl
,
2236 cmd
->orig_fe_lun
, 0x2C,
2237 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2239 CMD_TFO(cmd
)->queue_status(cmd
);
2241 case PYX_TRANSPORT_USE_SENSE_REASON
:
2243 * struct se_cmd->scsi_sense_reason already set
2247 printk(KERN_ERR
"Unknown transport error for CDB 0x%02x: %d\n",
2248 T_TASK(cmd
)->t_task_cdb
[0],
2249 cmd
->transport_error_status
);
2250 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
2255 transport_new_cmd_failure(cmd
);
2257 transport_send_check_condition_and_sense(cmd
,
2258 cmd
->scsi_sense_reason
, 0);
2260 transport_lun_remove_cmd(cmd
);
2261 if (!(transport_cmd_check_stop_to_fabric(cmd
)))
2265 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
2267 unsigned long flags
;
2269 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2270 if (!(atomic_read(&T_TASK(cmd
)->t_transport_timeout
))) {
2271 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2274 if (atomic_read(&T_TASK(cmd
)->t_task_cdbs_timeout_left
)) {
2275 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2279 atomic_sub(atomic_read(&T_TASK(cmd
)->t_transport_timeout
),
2280 &T_TASK(cmd
)->t_se_count
);
2281 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2284 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
2286 unsigned long flags
;
2289 * Reset T_TASK(cmd)->t_se_count to allow transport_generic_remove()
2290 * to allow last call to free memory resources.
2292 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2293 if (atomic_read(&T_TASK(cmd
)->t_transport_timeout
) > 1) {
2294 int tmp
= (atomic_read(&T_TASK(cmd
)->t_transport_timeout
) - 1);
2296 atomic_sub(tmp
, &T_TASK(cmd
)->t_se_count
);
2298 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2300 transport_generic_remove(cmd
, 0, 0);
2304 transport_generic_allocate_buf(struct se_cmd
*cmd
, u32 data_length
)
2308 buf
= kzalloc(data_length
, GFP_KERNEL
);
2310 printk(KERN_ERR
"Unable to allocate memory for buffer\n");
2314 T_TASK(cmd
)->t_tasks_se_num
= 0;
2315 T_TASK(cmd
)->t_task_buf
= buf
;
2320 static inline u32
transport_lba_21(unsigned char *cdb
)
2322 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2325 static inline u32
transport_lba_32(unsigned char *cdb
)
2327 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2330 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2332 unsigned int __v1
, __v2
;
2334 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2335 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2337 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2341 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2343 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2345 unsigned int __v1
, __v2
;
2347 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2348 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2350 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2353 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2355 unsigned long flags
;
2357 spin_lock_irqsave(&T_TASK(se_cmd
)->t_state_lock
, flags
);
2358 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2359 spin_unlock_irqrestore(&T_TASK(se_cmd
)->t_state_lock
, flags
);
2363 * Called from interrupt context.
2365 static void transport_task_timeout_handler(unsigned long data
)
2367 struct se_task
*task
= (struct se_task
*)data
;
2368 struct se_cmd
*cmd
= TASK_CMD(task
);
2369 unsigned long flags
;
2371 DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2373 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2374 if (task
->task_flags
& TF_STOP
) {
2375 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2378 task
->task_flags
&= ~TF_RUNNING
;
2381 * Determine if transport_complete_task() has already been called.
2383 if (!(atomic_read(&task
->task_active
))) {
2384 DEBUG_TT("transport task: %p cmd: %p timeout task_active"
2385 " == 0\n", task
, cmd
);
2386 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2390 atomic_inc(&T_TASK(cmd
)->t_se_count
);
2391 atomic_inc(&T_TASK(cmd
)->t_transport_timeout
);
2392 T_TASK(cmd
)->t_tasks_failed
= 1;
2394 atomic_set(&task
->task_timeout
, 1);
2395 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2396 task
->task_scsi_status
= 1;
2398 if (atomic_read(&task
->task_stop
)) {
2399 DEBUG_TT("transport task: %p cmd: %p timeout task_stop"
2400 " == 1\n", task
, cmd
);
2401 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2402 complete(&task
->task_stop_comp
);
2406 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_task_cdbs_left
))) {
2407 DEBUG_TT("transport task: %p cmd: %p timeout non zero"
2408 " t_task_cdbs_left\n", task
, cmd
);
2409 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2412 DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2415 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2416 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2418 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
);
2422 * Called with T_TASK(cmd)->t_state_lock held.
2424 static void transport_start_task_timer(struct se_task
*task
)
2426 struct se_device
*dev
= task
->se_dev
;
2429 if (task
->task_flags
& TF_RUNNING
)
2432 * If the task_timeout is disabled, exit now.
2434 timeout
= DEV_ATTRIB(dev
)->task_timeout
;
2438 init_timer(&task
->task_timer
);
2439 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2440 task
->task_timer
.data
= (unsigned long) task
;
2441 task
->task_timer
.function
= transport_task_timeout_handler
;
2443 task
->task_flags
|= TF_RUNNING
;
2444 add_timer(&task
->task_timer
);
2446 printk(KERN_INFO
"Starting task timer for cmd: %p task: %p seconds:"
2447 " %d\n", task
->task_se_cmd
, task
, timeout
);
2452 * Called with spin_lock_irq(&T_TASK(cmd)->t_state_lock) held.
2454 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2456 struct se_cmd
*cmd
= TASK_CMD(task
);
2458 if (!(task
->task_flags
& TF_RUNNING
))
2461 task
->task_flags
|= TF_STOP
;
2462 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, *flags
);
2464 del_timer_sync(&task
->task_timer
);
2466 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, *flags
);
2467 task
->task_flags
&= ~TF_RUNNING
;
2468 task
->task_flags
&= ~TF_STOP
;
2471 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2473 struct se_task
*task
= NULL
, *task_tmp
;
2474 unsigned long flags
;
2476 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2477 list_for_each_entry_safe(task
, task_tmp
,
2478 &T_TASK(cmd
)->t_task_list
, t_list
)
2479 __transport_stop_task_timer(task
, &flags
);
2480 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2483 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2485 if (dev
->dev_tcq_window_closed
++ <
2486 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2487 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2489 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2491 wake_up_interruptible(&dev
->dev_queue_obj
->thread_wq
);
2496 * Called from Fabric Module context from transport_execute_tasks()
2498 * The return of this function determins if the tasks from struct se_cmd
2499 * get added to the execution queue in transport_execute_tasks(),
2500 * or are added to the delayed or ordered lists here.
2502 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2504 if (SE_DEV(cmd
)->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2507 * Check for the existance of HEAD_OF_QUEUE, and if true return 1
2508 * to allow the passed struct se_cmd list of tasks to the front of the list.
2510 if (cmd
->sam_task_attr
== TASK_ATTR_HOQ
) {
2511 atomic_inc(&SE_DEV(cmd
)->dev_hoq_count
);
2512 smp_mb__after_atomic_inc();
2513 DEBUG_STA("Added HEAD_OF_QUEUE for CDB:"
2514 " 0x%02x, se_ordered_id: %u\n",
2515 T_TASK(cmd
)->t_task_cdb
[0],
2516 cmd
->se_ordered_id
);
2518 } else if (cmd
->sam_task_attr
== TASK_ATTR_ORDERED
) {
2519 spin_lock(&SE_DEV(cmd
)->ordered_cmd_lock
);
2520 list_add_tail(&cmd
->se_ordered_list
,
2521 &SE_DEV(cmd
)->ordered_cmd_list
);
2522 spin_unlock(&SE_DEV(cmd
)->ordered_cmd_lock
);
2524 atomic_inc(&SE_DEV(cmd
)->dev_ordered_sync
);
2525 smp_mb__after_atomic_inc();
2527 DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered"
2528 " list, se_ordered_id: %u\n",
2529 T_TASK(cmd
)->t_task_cdb
[0],
2530 cmd
->se_ordered_id
);
2532 * Add ORDERED command to tail of execution queue if
2533 * no other older commands exist that need to be
2536 if (!(atomic_read(&SE_DEV(cmd
)->simple_cmds
)))
2540 * For SIMPLE and UNTAGGED Task Attribute commands
2542 atomic_inc(&SE_DEV(cmd
)->simple_cmds
);
2543 smp_mb__after_atomic_inc();
2546 * Otherwise if one or more outstanding ORDERED task attribute exist,
2547 * add the dormant task(s) built for the passed struct se_cmd to the
2548 * execution queue and become in Active state for this struct se_device.
2550 if (atomic_read(&SE_DEV(cmd
)->dev_ordered_sync
) != 0) {
2552 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2553 * will be drained upon competion of HEAD_OF_QUEUE task.
2555 spin_lock(&SE_DEV(cmd
)->delayed_cmd_lock
);
2556 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2557 list_add_tail(&cmd
->se_delayed_list
,
2558 &SE_DEV(cmd
)->delayed_cmd_list
);
2559 spin_unlock(&SE_DEV(cmd
)->delayed_cmd_lock
);
2561 DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to"
2562 " delayed CMD list, se_ordered_id: %u\n",
2563 T_TASK(cmd
)->t_task_cdb
[0], cmd
->sam_task_attr
,
2564 cmd
->se_ordered_id
);
2566 * Return zero to let transport_execute_tasks() know
2567 * not to add the delayed tasks to the execution list.
2572 * Otherwise, no ORDERED task attributes exist..
2578 * Called from fabric module context in transport_generic_new_cmd() and
2579 * transport_generic_process_write()
2581 static int transport_execute_tasks(struct se_cmd
*cmd
)
2585 if (!(cmd
->se_cmd_flags
& SCF_SE_DISABLE_ONLINE_CHECK
)) {
2586 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2587 cmd
->transport_error_status
=
2588 PYX_TRANSPORT_LU_COMM_FAILURE
;
2589 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2594 * Call transport_cmd_check_stop() to see if a fabric exception
2595 * has occured that prevents execution.
2597 if (!(transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
))) {
2599 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2600 * attribute for the tasks of the received struct se_cmd CDB
2602 add_tasks
= transport_execute_task_attr(cmd
);
2606 * This calls transport_add_tasks_from_cmd() to handle
2607 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2608 * (if enabled) in __transport_add_task_to_execute_queue() and
2609 * transport_add_task_check_sam_attr().
2611 transport_add_tasks_from_cmd(cmd
);
2614 * Kick the execution queue for the cmd associated struct se_device
2618 __transport_execute_tasks(SE_DEV(cmd
));
2623 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2624 * from struct se_device->execute_task_list and
2626 * Called from transport_processing_thread()
2628 static int __transport_execute_tasks(struct se_device
*dev
)
2631 struct se_cmd
*cmd
= NULL
;
2632 struct se_task
*task
;
2633 unsigned long flags
;
2636 * Check if there is enough room in the device and HBA queue to send
2637 * struct se_transport_task's to the selected transport.
2640 spin_lock_irqsave(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2641 if (!(atomic_read(&dev
->depth_left
)) ||
2642 !(atomic_read(&SE_HBA(dev
)->left_queue_depth
))) {
2643 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2644 return transport_tcq_window_closed(dev
);
2646 dev
->dev_tcq_window_closed
= 0;
2648 spin_lock(&dev
->execute_task_lock
);
2649 task
= transport_get_task_from_execute_queue(dev
);
2650 spin_unlock(&dev
->execute_task_lock
);
2653 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2657 atomic_dec(&dev
->depth_left
);
2658 atomic_dec(&SE_HBA(dev
)->left_queue_depth
);
2659 spin_unlock_irqrestore(&SE_HBA(dev
)->hba_queue_lock
, flags
);
2661 cmd
= TASK_CMD(task
);
2663 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2664 atomic_set(&task
->task_active
, 1);
2665 atomic_set(&task
->task_sent
, 1);
2666 atomic_inc(&T_TASK(cmd
)->t_task_cdbs_sent
);
2668 if (atomic_read(&T_TASK(cmd
)->t_task_cdbs_sent
) ==
2669 T_TASK(cmd
)->t_task_cdbs
)
2670 atomic_set(&cmd
->transport_sent
, 1);
2672 transport_start_task_timer(task
);
2673 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2675 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2676 * to grab REPORT_LUNS CDBs before they hit the
2677 * struct se_subsystem_api->do_task() caller below.
2679 if (cmd
->transport_emulate_cdb
) {
2680 error
= cmd
->transport_emulate_cdb(cmd
);
2682 cmd
->transport_error_status
= error
;
2683 atomic_set(&task
->task_active
, 0);
2684 atomic_set(&cmd
->transport_sent
, 0);
2685 transport_stop_tasks_for_cmd(cmd
);
2686 transport_generic_request_failure(cmd
, dev
, 0, 1);
2690 * Handle the successful completion for transport_emulate_cdb()
2691 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2692 * Otherwise the caller is expected to complete the task with
2695 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2696 cmd
->scsi_status
= SAM_STAT_GOOD
;
2697 task
->task_scsi_status
= GOOD
;
2698 transport_complete_task(task
, 1);
2702 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2703 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2704 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2705 * LUN emulation code.
2707 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2708 * call ->do_task() directly and let the underlying TCM subsystem plugin
2709 * code handle the CDB emulation.
2711 if ((TRANSPORT(dev
)->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2712 (!(TASK_CMD(task
)->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2713 error
= transport_emulate_control_cdb(task
);
2715 error
= TRANSPORT(dev
)->do_task(task
);
2718 cmd
->transport_error_status
= error
;
2719 atomic_set(&task
->task_active
, 0);
2720 atomic_set(&cmd
->transport_sent
, 0);
2721 transport_stop_tasks_for_cmd(cmd
);
2722 transport_generic_request_failure(cmd
, dev
, 0, 1);
2731 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2733 unsigned long flags
;
2735 * Any unsolicited data will get dumped for failed command inside of
2738 spin_lock_irqsave(&T_TASK(se_cmd
)->t_state_lock
, flags
);
2739 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2740 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2741 spin_unlock_irqrestore(&T_TASK(se_cmd
)->t_state_lock
, flags
);
2743 CMD_TFO(se_cmd
)->new_cmd_failure(se_cmd
);
2746 static void transport_nop_wait_for_tasks(struct se_cmd
*, int, int);
2748 static inline u32
transport_get_sectors_6(
2753 struct se_device
*dev
= SE_LUN(cmd
)->lun_se_dev
;
2756 * Assume TYPE_DISK for non struct se_device objects.
2757 * Use 8-bit sector value.
2763 * Use 24-bit allocation length for TYPE_TAPE.
2765 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
)
2766 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2769 * Everything else assume TYPE_DISK Sector CDB location.
2770 * Use 8-bit sector value.
2776 static inline u32
transport_get_sectors_10(
2781 struct se_device
*dev
= SE_LUN(cmd
)->lun_se_dev
;
2784 * Assume TYPE_DISK for non struct se_device objects.
2785 * Use 16-bit sector value.
2791 * XXX_10 is not defined in SSC, throw an exception
2793 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
) {
2799 * Everything else assume TYPE_DISK Sector CDB location.
2800 * Use 16-bit sector value.
2803 return (u32
)(cdb
[7] << 8) + cdb
[8];
2806 static inline u32
transport_get_sectors_12(
2811 struct se_device
*dev
= SE_LUN(cmd
)->lun_se_dev
;
2814 * Assume TYPE_DISK for non struct se_device objects.
2815 * Use 32-bit sector value.
2821 * XXX_12 is not defined in SSC, throw an exception
2823 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
) {
2829 * Everything else assume TYPE_DISK Sector CDB location.
2830 * Use 32-bit sector value.
2833 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2836 static inline u32
transport_get_sectors_16(
2841 struct se_device
*dev
= SE_LUN(cmd
)->lun_se_dev
;
2844 * Assume TYPE_DISK for non struct se_device objects.
2845 * Use 32-bit sector value.
2851 * Use 24-bit allocation length for TYPE_TAPE.
2853 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
)
2854 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2857 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2858 (cdb
[12] << 8) + cdb
[13];
2862 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2864 static inline u32
transport_get_sectors_32(
2870 * Assume TYPE_DISK for non struct se_device objects.
2871 * Use 32-bit sector value.
2873 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2874 (cdb
[30] << 8) + cdb
[31];
2878 static inline u32
transport_get_size(
2883 struct se_device
*dev
= SE_DEV(cmd
);
2885 if (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_TAPE
) {
2886 if (cdb
[1] & 1) { /* sectors */
2887 return DEV_ATTRIB(dev
)->block_size
* sectors
;
2892 printk(KERN_INFO
"Returning block_size: %u, sectors: %u == %u for"
2893 " %s object\n", DEV_ATTRIB(dev
)->block_size
, sectors
,
2894 DEV_ATTRIB(dev
)->block_size
* sectors
,
2895 TRANSPORT(dev
)->name
);
2897 return DEV_ATTRIB(dev
)->block_size
* sectors
;
2900 unsigned char transport_asciihex_to_binaryhex(unsigned char val
[2])
2902 unsigned char result
= 0;
2906 if ((val
[0] >= 'a') && (val
[0] <= 'f'))
2907 result
= ((val
[0] - 'a' + 10) & 0xf) << 4;
2909 if ((val
[0] >= 'A') && (val
[0] <= 'F'))
2910 result
= ((val
[0] - 'A' + 10) & 0xf) << 4;
2912 result
= ((val
[0] - '0') & 0xf) << 4;
2916 if ((val
[1] >= 'a') && (val
[1] <= 'f'))
2917 result
|= ((val
[1] - 'a' + 10) & 0xf);
2919 if ((val
[1] >= 'A') && (val
[1] <= 'F'))
2920 result
|= ((val
[1] - 'A' + 10) & 0xf);
2922 result
|= ((val
[1] - '0') & 0xf);
2926 EXPORT_SYMBOL(transport_asciihex_to_binaryhex
);
2928 static void transport_xor_callback(struct se_cmd
*cmd
)
2930 unsigned char *buf
, *addr
;
2931 struct se_mem
*se_mem
;
2932 unsigned int offset
;
2935 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2937 * 1) read the specified logical block(s);
2938 * 2) transfer logical blocks from the data-out buffer;
2939 * 3) XOR the logical blocks transferred from the data-out buffer with
2940 * the logical blocks read, storing the resulting XOR data in a buffer;
2941 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2942 * blocks transferred from the data-out buffer; and
2943 * 5) transfer the resulting XOR data to the data-in buffer.
2945 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2947 printk(KERN_ERR
"Unable to allocate xor_callback buf\n");
2951 * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list
2952 * into the locally allocated *buf
2954 transport_memcpy_se_mem_read_contig(cmd
, buf
, T_TASK(cmd
)->t_mem_list
);
2956 * Now perform the XOR against the BIDI read memory located at
2957 * T_TASK(cmd)->t_mem_bidi_list
2961 list_for_each_entry(se_mem
, T_TASK(cmd
)->t_mem_bidi_list
, se_list
) {
2962 addr
= (unsigned char *)kmap_atomic(se_mem
->se_page
, KM_USER0
);
2966 for (i
= 0; i
< se_mem
->se_len
; i
++)
2967 *(addr
+ se_mem
->se_off
+ i
) ^= *(buf
+ offset
+ i
);
2969 offset
+= se_mem
->se_len
;
2970 kunmap_atomic(addr
, KM_USER0
);
2977 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2979 static int transport_get_sense_data(struct se_cmd
*cmd
)
2981 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2982 struct se_device
*dev
;
2983 struct se_task
*task
= NULL
, *task_tmp
;
2984 unsigned long flags
;
2988 printk(KERN_ERR
"SE_LUN(cmd) is NULL\n");
2991 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
2992 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2993 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
2997 list_for_each_entry_safe(task
, task_tmp
,
2998 &T_TASK(cmd
)->t_task_list
, t_list
) {
3000 if (!task
->task_sense
)
3007 if (!TRANSPORT(dev
)->get_sense_buffer
) {
3008 printk(KERN_ERR
"TRANSPORT(dev)->get_sense_buffer"
3013 sense_buffer
= TRANSPORT(dev
)->get_sense_buffer(task
);
3014 if (!(sense_buffer
)) {
3015 printk(KERN_ERR
"ITT[0x%08x]_TASK[%d]: Unable to locate"
3016 " sense buffer for task with sense\n",
3017 CMD_TFO(cmd
)->get_task_tag(cmd
), task
->task_no
);
3020 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
3022 offset
= CMD_TFO(cmd
)->set_fabric_sense_len(cmd
,
3023 TRANSPORT_SENSE_BUFFER
);
3025 memcpy((void *)&buffer
[offset
], (void *)sense_buffer
,
3026 TRANSPORT_SENSE_BUFFER
);
3027 cmd
->scsi_status
= task
->task_scsi_status
;
3028 /* Automatically padded */
3029 cmd
->scsi_sense_length
=
3030 (TRANSPORT_SENSE_BUFFER
+ offset
);
3032 printk(KERN_INFO
"HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
3034 dev
->se_hba
->hba_id
, TRANSPORT(dev
)->name
,
3038 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
3043 static int transport_allocate_resources(struct se_cmd
*cmd
)
3045 u32 length
= cmd
->data_length
;
3047 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3048 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
))
3049 return transport_generic_get_mem(cmd
, length
, PAGE_SIZE
);
3050 else if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_NONSG_IO_CDB
)
3051 return transport_generic_allocate_buf(cmd
, length
);
3057 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
3059 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3060 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3061 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
3062 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
3064 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
3065 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
3068 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
3071 DEV_ATTRIB(cmd
->se_dev
)->emulate_ua_intlck_ctrl
== 2)
3072 core_scsi3_ua_allocate(SE_SESS(cmd
)->se_node_acl
,
3073 cmd
->orig_fe_lun
, 0x2C,
3074 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
3078 /* transport_generic_cmd_sequencer():
3080 * Generic Command Sequencer that should work for most DAS transport
3083 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
3086 * FIXME: Need to support other SCSI OPCODES where as well.
3088 static int transport_generic_cmd_sequencer(
3092 struct se_device
*dev
= SE_DEV(cmd
);
3093 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
3094 int ret
= 0, sector_ret
= 0, passthrough
;
3095 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
3099 * Check for an existing UNIT ATTENTION condition
3101 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
3102 cmd
->transport_wait_for_tasks
=
3103 &transport_nop_wait_for_tasks
;
3104 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3105 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
3109 * Check status of Asymmetric Logical Unit Assignment port
3111 ret
= T10_ALUA(su_dev
)->alua_state_check(cmd
, cdb
, &alua_ascq
);
3113 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3115 * Set SCSI additional sense code (ASC) to 'LUN Not Accessable';
3116 * The ALUA additional sense code qualifier (ASCQ) is determined
3117 * by the ALUA primary or secondary access state..
3121 printk(KERN_INFO
"[%s]: ALUA TG Port not available,"
3122 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
3123 CMD_TFO(cmd
)->get_fabric_name(), alua_ascq
);
3125 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
3126 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3127 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
3130 goto out_invalid_cdb_field
;
3133 * Check status for SPC-3 Persistent Reservations
3135 if (T10_PR_OPS(su_dev
)->t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
3136 if (T10_PR_OPS(su_dev
)->t10_seq_non_holder(
3137 cmd
, cdb
, pr_reg_type
) != 0)
3138 return transport_handle_reservation_conflict(cmd
);
3140 * This means the CDB is allowed for the SCSI Initiator port
3141 * when said port is *NOT* holding the legacy SPC-2 or
3142 * SPC-3 Persistent Reservation.
3148 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
3150 goto out_unsupported_cdb
;
3151 size
= transport_get_size(sectors
, cdb
, cmd
);
3152 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
3153 T_TASK(cmd
)->t_task_lba
= transport_lba_21(cdb
);
3154 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3157 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3159 goto out_unsupported_cdb
;
3160 size
= transport_get_size(sectors
, cdb
, cmd
);
3161 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
3162 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3163 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3166 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
3168 goto out_unsupported_cdb
;
3169 size
= transport_get_size(sectors
, cdb
, cmd
);
3170 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
3171 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3172 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3175 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3177 goto out_unsupported_cdb
;
3178 size
= transport_get_size(sectors
, cdb
, cmd
);
3179 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
3180 T_TASK(cmd
)->t_task_lba
= transport_lba_64(cdb
);
3181 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3184 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
3186 goto out_unsupported_cdb
;
3187 size
= transport_get_size(sectors
, cdb
, cmd
);
3188 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
3189 T_TASK(cmd
)->t_task_lba
= transport_lba_21(cdb
);
3190 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3193 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3195 goto out_unsupported_cdb
;
3196 size
= transport_get_size(sectors
, cdb
, cmd
);
3197 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
3198 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3199 T_TASK(cmd
)->t_tasks_fua
= (cdb
[1] & 0x8);
3200 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3203 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
3205 goto out_unsupported_cdb
;
3206 size
= transport_get_size(sectors
, cdb
, cmd
);
3207 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
3208 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3209 T_TASK(cmd
)->t_tasks_fua
= (cdb
[1] & 0x8);
3210 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3213 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3215 goto out_unsupported_cdb
;
3216 size
= transport_get_size(sectors
, cdb
, cmd
);
3217 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
3218 T_TASK(cmd
)->t_task_lba
= transport_lba_64(cdb
);
3219 T_TASK(cmd
)->t_tasks_fua
= (cdb
[1] & 0x8);
3220 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3222 case XDWRITEREAD_10
:
3223 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
3224 !(T_TASK(cmd
)->t_tasks_bidi
))
3225 goto out_invalid_cdb_field
;
3226 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3228 goto out_unsupported_cdb
;
3229 size
= transport_get_size(sectors
, cdb
, cmd
);
3230 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
3231 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3232 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3233 passthrough
= (TRANSPORT(dev
)->transport_type
==
3234 TRANSPORT_PLUGIN_PHBA_PDEV
);
3236 * Skip the remaining assignments for TCM/PSCSI passthrough
3241 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3243 cmd
->transport_complete_callback
= &transport_xor_callback
;
3244 T_TASK(cmd
)->t_tasks_fua
= (cdb
[1] & 0x8);
3246 case VARIABLE_LENGTH_CMD
:
3247 service_action
= get_unaligned_be16(&cdb
[8]);
3249 * Determine if this is TCM/PSCSI device and we should disable
3250 * internal emulation for this CDB.
3252 passthrough
= (TRANSPORT(dev
)->transport_type
==
3253 TRANSPORT_PLUGIN_PHBA_PDEV
);
3255 switch (service_action
) {
3256 case XDWRITEREAD_32
:
3257 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3259 goto out_unsupported_cdb
;
3260 size
= transport_get_size(sectors
, cdb
, cmd
);
3262 * Use WRITE_32 and READ_32 opcodes for the emulated
3263 * XDWRITE_READ_32 logic.
3265 cmd
->transport_split_cdb
= &split_cdb_XX_32
;
3266 T_TASK(cmd
)->t_task_lba
= transport_lba_64_ext(cdb
);
3267 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3270 * Skip the remaining assignments for TCM/PSCSI passthrough
3276 * Setup BIDI XOR callback to be run during
3277 * transport_generic_complete_ok()
3279 cmd
->transport_complete_callback
= &transport_xor_callback
;
3280 T_TASK(cmd
)->t_tasks_fua
= (cdb
[10] & 0x8);
3283 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3285 goto out_unsupported_cdb
;
3286 size
= transport_get_size(sectors
, cdb
, cmd
);
3287 T_TASK(cmd
)->t_task_lba
= get_unaligned_be64(&cdb
[12]);
3288 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3291 * Skip the remaining assignments for TCM/PSCSI passthrough
3296 if ((cdb
[10] & 0x04) || (cdb
[10] & 0x02)) {
3297 printk(KERN_ERR
"WRITE_SAME PBDATA and LBDATA"
3298 " bits not supported for Block Discard"
3300 goto out_invalid_cdb_field
;
3303 * Currently for the emulated case we only accept
3304 * tpws with the UNMAP=1 bit set.
3306 if (!(cdb
[10] & 0x08)) {
3307 printk(KERN_ERR
"WRITE_SAME w/o UNMAP bit not"
3308 " supported for Block Discard Emulation\n");
3309 goto out_invalid_cdb_field
;
3313 printk(KERN_ERR
"VARIABLE_LENGTH_CMD service action"
3314 " 0x%04x not supported\n", service_action
);
3315 goto out_unsupported_cdb
;
3319 if (TRANSPORT(dev
)->get_device_type(dev
) != TYPE_ROM
) {
3320 /* MAINTENANCE_IN from SCC-2 */
3322 * Check for emulated MI_REPORT_TARGET_PGS.
3324 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
3325 cmd
->transport_emulate_cdb
=
3326 (T10_ALUA(su_dev
)->alua_type
==
3327 SPC3_ALUA_EMULATED
) ?
3328 &core_emulate_report_target_port_groups
:
3331 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3332 (cdb
[8] << 8) | cdb
[9];
3334 /* GPCMD_SEND_KEY from multi media commands */
3335 size
= (cdb
[8] << 8) + cdb
[9];
3337 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3341 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3343 case MODE_SELECT_10
:
3344 size
= (cdb
[7] << 8) + cdb
[8];
3345 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3349 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3352 case GPCMD_READ_BUFFER_CAPACITY
:
3353 case GPCMD_SEND_OPC
:
3356 size
= (cdb
[7] << 8) + cdb
[8];
3357 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3359 case READ_BLOCK_LIMITS
:
3360 size
= READ_BLOCK_LEN
;
3361 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3363 case GPCMD_GET_CONFIGURATION
:
3364 case GPCMD_READ_FORMAT_CAPACITIES
:
3365 case GPCMD_READ_DISC_INFO
:
3366 case GPCMD_READ_TRACK_RZONE_INFO
:
3367 size
= (cdb
[7] << 8) + cdb
[8];
3368 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3370 case PERSISTENT_RESERVE_IN
:
3371 case PERSISTENT_RESERVE_OUT
:
3372 cmd
->transport_emulate_cdb
=
3373 (T10_RES(su_dev
)->res_type
==
3374 SPC3_PERSISTENT_RESERVATIONS
) ?
3375 &core_scsi3_emulate_pr
: NULL
;
3376 size
= (cdb
[7] << 8) + cdb
[8];
3377 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3379 case GPCMD_MECHANISM_STATUS
:
3380 case GPCMD_READ_DVD_STRUCTURE
:
3381 size
= (cdb
[8] << 8) + cdb
[9];
3382 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3385 size
= READ_POSITION_LEN
;
3386 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3389 if (TRANSPORT(dev
)->get_device_type(dev
) != TYPE_ROM
) {
3390 /* MAINTENANCE_OUT from SCC-2
3392 * Check for emulated MO_SET_TARGET_PGS.
3394 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3395 cmd
->transport_emulate_cdb
=
3396 (T10_ALUA(su_dev
)->alua_type
==
3397 SPC3_ALUA_EMULATED
) ?
3398 &core_emulate_set_target_port_groups
:
3402 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3403 (cdb
[8] << 8) | cdb
[9];
3405 /* GPCMD_REPORT_KEY from multi media commands */
3406 size
= (cdb
[8] << 8) + cdb
[9];
3408 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3411 size
= (cdb
[3] << 8) + cdb
[4];
3413 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3414 * See spc4r17 section 5.3
3416 if (SE_DEV(cmd
)->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3417 cmd
->sam_task_attr
= TASK_ATTR_HOQ
;
3418 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3421 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3422 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3425 size
= READ_CAP_LEN
;
3426 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3428 case READ_MEDIA_SERIAL_NUMBER
:
3429 case SECURITY_PROTOCOL_IN
:
3430 case SECURITY_PROTOCOL_OUT
:
3431 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3432 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3434 case SERVICE_ACTION_IN
:
3435 case ACCESS_CONTROL_IN
:
3436 case ACCESS_CONTROL_OUT
:
3438 case READ_ATTRIBUTE
:
3439 case RECEIVE_COPY_RESULTS
:
3440 case WRITE_ATTRIBUTE
:
3441 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3442 (cdb
[12] << 8) | cdb
[13];
3443 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3445 case RECEIVE_DIAGNOSTIC
:
3446 case SEND_DIAGNOSTIC
:
3447 size
= (cdb
[3] << 8) | cdb
[4];
3448 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3450 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3453 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3454 size
= (2336 * sectors
);
3455 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3460 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3464 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3466 case READ_ELEMENT_STATUS
:
3467 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3468 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3471 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3472 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3477 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3478 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3480 if (cdb
[0] == RESERVE_10
)
3481 size
= (cdb
[7] << 8) | cdb
[8];
3483 size
= cmd
->data_length
;
3486 * Setup the legacy emulated handler for SPC-2 and
3487 * >= SPC-3 compatible reservation handling (CRH=1)
3488 * Otherwise, we assume the underlying SCSI logic is
3489 * is running in SPC_PASSTHROUGH, and wants reservations
3490 * emulation disabled.
3492 cmd
->transport_emulate_cdb
=
3493 (T10_RES(su_dev
)->res_type
!=
3495 &core_scsi2_emulate_crh
: NULL
;
3496 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3501 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3502 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3504 if (cdb
[0] == RELEASE_10
)
3505 size
= (cdb
[7] << 8) | cdb
[8];
3507 size
= cmd
->data_length
;
3509 cmd
->transport_emulate_cdb
=
3510 (T10_RES(su_dev
)->res_type
!=
3512 &core_scsi2_emulate_crh
: NULL
;
3513 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3515 case SYNCHRONIZE_CACHE
:
3516 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3518 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3520 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3521 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3522 T_TASK(cmd
)->t_task_lba
= transport_lba_32(cdb
);
3524 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3525 T_TASK(cmd
)->t_task_lba
= transport_lba_64(cdb
);
3528 goto out_unsupported_cdb
;
3530 size
= transport_get_size(sectors
, cdb
, cmd
);
3531 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3534 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3536 if (TRANSPORT(dev
)->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3539 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3540 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3542 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3544 * Check to ensure that LBA + Range does not exceed past end of
3547 if (transport_get_sectors(cmd
) < 0)
3548 goto out_invalid_cdb_field
;
3551 size
= get_unaligned_be16(&cdb
[7]);
3552 passthrough
= (TRANSPORT(dev
)->transport_type
==
3553 TRANSPORT_PLUGIN_PHBA_PDEV
);
3555 * Determine if the received UNMAP used to for direct passthrough
3556 * into Linux/SCSI with struct request via TCM/pSCSI or we are
3557 * signaling the use of internal transport_generic_unmap() emulation
3558 * for UNMAP -> Linux/BLOCK disbard with TCM/IBLOCK and TCM/FILEIO
3559 * subsystem plugin backstores.
3562 cmd
->se_cmd_flags
|= SCF_EMULATE_SYNC_UNMAP
;
3564 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3567 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3569 goto out_unsupported_cdb
;
3570 size
= transport_get_size(sectors
, cdb
, cmd
);
3571 T_TASK(cmd
)->t_task_lba
= get_unaligned_be16(&cdb
[2]);
3572 passthrough
= (TRANSPORT(dev
)->transport_type
==
3573 TRANSPORT_PLUGIN_PHBA_PDEV
);
3575 * Determine if the received WRITE_SAME_16 is used to for direct
3576 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3577 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3578 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3579 * TCM/FILEIO subsystem plugin backstores.
3581 if (!(passthrough
)) {
3582 if ((cdb
[1] & 0x04) || (cdb
[1] & 0x02)) {
3583 printk(KERN_ERR
"WRITE_SAME PBDATA and LBDATA"
3584 " bits not supported for Block Discard"
3586 goto out_invalid_cdb_field
;
3589 * Currently for the emulated case we only accept
3590 * tpws with the UNMAP=1 bit set.
3592 if (!(cdb
[1] & 0x08)) {
3593 printk(KERN_ERR
"WRITE_SAME w/o UNMAP bit not "
3594 " supported for Block Discard Emulation\n");
3595 goto out_invalid_cdb_field
;
3598 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3600 case ALLOW_MEDIUM_REMOVAL
:
3601 case GPCMD_CLOSE_TRACK
:
3603 case INITIALIZE_ELEMENT_STATUS
:
3604 case GPCMD_LOAD_UNLOAD
:
3607 case GPCMD_SET_SPEED
:
3610 case TEST_UNIT_READY
:
3612 case WRITE_FILEMARKS
:
3614 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3617 cmd
->transport_emulate_cdb
=
3618 &transport_core_report_lun_response
;
3619 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3621 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3622 * See spc4r17 section 5.3
3624 if (SE_DEV(cmd
)->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3625 cmd
->sam_task_attr
= TASK_ATTR_HOQ
;
3626 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_NONSG_IO_CDB
;
3629 printk(KERN_WARNING
"TARGET_CORE[%s]: Unsupported SCSI Opcode"
3630 " 0x%02x, sending CHECK_CONDITION.\n",
3631 CMD_TFO(cmd
)->get_fabric_name(), cdb
[0]);
3632 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3633 goto out_unsupported_cdb
;
3636 if (size
!= cmd
->data_length
) {
3637 printk(KERN_WARNING
"TARGET_CORE[%s]: Expected Transfer Length:"
3638 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3639 " 0x%02x\n", CMD_TFO(cmd
)->get_fabric_name(),
3640 cmd
->data_length
, size
, cdb
[0]);
3642 cmd
->cmd_spdtl
= size
;
3644 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3645 printk(KERN_ERR
"Rejecting underflow/overflow"
3647 goto out_invalid_cdb_field
;
3650 * Reject READ_* or WRITE_* with overflow/underflow for
3651 * type SCF_SCSI_DATA_SG_IO_CDB.
3653 if (!(ret
) && (DEV_ATTRIB(dev
)->block_size
!= 512)) {
3654 printk(KERN_ERR
"Failing OVERFLOW/UNDERFLOW for LBA op"
3655 " CDB on non 512-byte sector setup subsystem"
3656 " plugin: %s\n", TRANSPORT(dev
)->name
);
3657 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3658 goto out_invalid_cdb_field
;
3661 if (size
> cmd
->data_length
) {
3662 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3663 cmd
->residual_count
= (size
- cmd
->data_length
);
3665 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3666 cmd
->residual_count
= (cmd
->data_length
- size
);
3668 cmd
->data_length
= size
;
3671 transport_set_supported_SAM_opcode(cmd
);
3674 out_unsupported_cdb
:
3675 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3676 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3678 out_invalid_cdb_field
:
3679 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3680 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3684 static inline void transport_release_tasks(struct se_cmd
*);
3687 * This function will copy a contiguous *src buffer into a destination
3688 * struct scatterlist array.
3690 static void transport_memcpy_write_contig(
3692 struct scatterlist
*sg_d
,
3695 u32 i
= 0, length
= 0, total_length
= cmd
->data_length
;
3698 while (total_length
) {
3699 length
= sg_d
[i
].length
;
3701 if (length
> total_length
)
3702 length
= total_length
;
3704 dst
= sg_virt(&sg_d
[i
]);
3706 memcpy(dst
, src
, length
);
3708 if (!(total_length
-= length
))
3717 * This function will copy a struct scatterlist array *sg_s into a destination
3718 * contiguous *dst buffer.
3720 static void transport_memcpy_read_contig(
3723 struct scatterlist
*sg_s
)
3725 u32 i
= 0, length
= 0, total_length
= cmd
->data_length
;
3728 while (total_length
) {
3729 length
= sg_s
[i
].length
;
3731 if (length
> total_length
)
3732 length
= total_length
;
3734 src
= sg_virt(&sg_s
[i
]);
3736 memcpy(dst
, src
, length
);
3738 if (!(total_length
-= length
))
3746 static void transport_memcpy_se_mem_read_contig(
3749 struct list_head
*se_mem_list
)
3751 struct se_mem
*se_mem
;
3753 u32 length
= 0, total_length
= cmd
->data_length
;
3755 list_for_each_entry(se_mem
, se_mem_list
, se_list
) {
3756 length
= se_mem
->se_len
;
3758 if (length
> total_length
)
3759 length
= total_length
;
3761 src
= page_address(se_mem
->se_page
) + se_mem
->se_off
;
3763 memcpy(dst
, src
, length
);
3765 if (!(total_length
-= length
))
3773 * Called from transport_generic_complete_ok() and
3774 * transport_generic_request_failure() to determine which dormant/delayed
3775 * and ordered cmds need to have their tasks added to the execution queue.
3777 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3779 struct se_device
*dev
= SE_DEV(cmd
);
3780 struct se_cmd
*cmd_p
, *cmd_tmp
;
3781 int new_active_tasks
= 0;
3783 if (cmd
->sam_task_attr
== TASK_ATTR_SIMPLE
) {
3784 atomic_dec(&dev
->simple_cmds
);
3785 smp_mb__after_atomic_dec();
3786 dev
->dev_cur_ordered_id
++;
3787 DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for"
3788 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3789 cmd
->se_ordered_id
);
3790 } else if (cmd
->sam_task_attr
== TASK_ATTR_HOQ
) {
3791 atomic_dec(&dev
->dev_hoq_count
);
3792 smp_mb__after_atomic_dec();
3793 dev
->dev_cur_ordered_id
++;
3794 DEBUG_STA("Incremented dev_cur_ordered_id: %u for"
3795 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3796 cmd
->se_ordered_id
);
3797 } else if (cmd
->sam_task_attr
== TASK_ATTR_ORDERED
) {
3798 spin_lock(&dev
->ordered_cmd_lock
);
3799 list_del(&cmd
->se_ordered_list
);
3800 atomic_dec(&dev
->dev_ordered_sync
);
3801 smp_mb__after_atomic_dec();
3802 spin_unlock(&dev
->ordered_cmd_lock
);
3804 dev
->dev_cur_ordered_id
++;
3805 DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:"
3806 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3809 * Process all commands up to the last received
3810 * ORDERED task attribute which requires another blocking
3813 spin_lock(&dev
->delayed_cmd_lock
);
3814 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3815 &dev
->delayed_cmd_list
, se_delayed_list
) {
3817 list_del(&cmd_p
->se_delayed_list
);
3818 spin_unlock(&dev
->delayed_cmd_lock
);
3820 DEBUG_STA("Calling add_tasks() for"
3821 " cmd_p: 0x%02x Task Attr: 0x%02x"
3822 " Dormant -> Active, se_ordered_id: %u\n",
3823 T_TASK(cmd_p
)->t_task_cdb
[0],
3824 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3826 transport_add_tasks_from_cmd(cmd_p
);
3829 spin_lock(&dev
->delayed_cmd_lock
);
3830 if (cmd_p
->sam_task_attr
== TASK_ATTR_ORDERED
)
3833 spin_unlock(&dev
->delayed_cmd_lock
);
3835 * If new tasks have become active, wake up the transport thread
3836 * to do the processing of the Active tasks.
3838 if (new_active_tasks
!= 0)
3839 wake_up_interruptible(&dev
->dev_queue_obj
->thread_wq
);
3842 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3846 * Check if we need to move delayed/dormant tasks from cmds on the
3847 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3850 if (SE_DEV(cmd
)->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3851 transport_complete_task_attr(cmd
);
3853 * Check if we need to retrieve a sense buffer from
3854 * the struct se_cmd in question.
3856 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3857 if (transport_get_sense_data(cmd
) < 0)
3858 reason
= TCM_NON_EXISTENT_LUN
;
3861 * Only set when an struct se_task->task_scsi_status returned
3862 * a non GOOD status.
3864 if (cmd
->scsi_status
) {
3865 transport_send_check_condition_and_sense(
3867 transport_lun_remove_cmd(cmd
);
3868 transport_cmd_check_stop_to_fabric(cmd
);
3873 * Check for a callback, used by amoungst other things
3874 * XDWRITE_READ_10 emulation.
3876 if (cmd
->transport_complete_callback
)
3877 cmd
->transport_complete_callback(cmd
);
3879 switch (cmd
->data_direction
) {
3880 case DMA_FROM_DEVICE
:
3881 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3882 if (SE_LUN(cmd
)->lun_sep
) {
3883 SE_LUN(cmd
)->lun_sep
->sep_stats
.tx_data_octets
+=
3886 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3888 * If enabled by TCM fabirc module pre-registered SGL
3889 * memory, perform the memcpy() from the TCM internal
3890 * contigious buffer back to the original SGL.
3892 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_CONTIG_TO_SG
)
3893 transport_memcpy_write_contig(cmd
,
3894 T_TASK(cmd
)->t_task_pt_sgl
,
3895 T_TASK(cmd
)->t_task_buf
);
3897 CMD_TFO(cmd
)->queue_data_in(cmd
);
3900 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3901 if (SE_LUN(cmd
)->lun_sep
) {
3902 SE_LUN(cmd
)->lun_sep
->sep_stats
.rx_data_octets
+=
3905 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3907 * Check if we need to send READ payload for BIDI-COMMAND
3909 if (T_TASK(cmd
)->t_mem_bidi_list
!= NULL
) {
3910 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3911 if (SE_LUN(cmd
)->lun_sep
) {
3912 SE_LUN(cmd
)->lun_sep
->sep_stats
.tx_data_octets
+=
3915 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3916 CMD_TFO(cmd
)->queue_data_in(cmd
);
3919 /* Fall through for DMA_TO_DEVICE */
3921 CMD_TFO(cmd
)->queue_status(cmd
);
3927 transport_lun_remove_cmd(cmd
);
3928 transport_cmd_check_stop_to_fabric(cmd
);
3931 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3933 struct se_task
*task
, *task_tmp
;
3934 unsigned long flags
;
3936 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
3937 list_for_each_entry_safe(task
, task_tmp
,
3938 &T_TASK(cmd
)->t_task_list
, t_list
) {
3939 if (atomic_read(&task
->task_active
))
3942 kfree(task
->task_sg_bidi
);
3943 kfree(task
->task_sg
);
3945 list_del(&task
->t_list
);
3947 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
3949 TRANSPORT(task
->se_dev
)->free_task(task
);
3951 printk(KERN_ERR
"task[%u] - task->se_dev is NULL\n",
3953 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
3955 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
3958 static inline void transport_free_pages(struct se_cmd
*cmd
)
3960 struct se_mem
*se_mem
, *se_mem_tmp
;
3963 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3965 if (cmd
->se_dev
->transport
->do_se_mem_map
)
3968 if (T_TASK(cmd
)->t_task_buf
) {
3969 kfree(T_TASK(cmd
)->t_task_buf
);
3970 T_TASK(cmd
)->t_task_buf
= NULL
;
3975 * Caller will handle releasing of struct se_mem.
3977 if (cmd
->se_cmd_flags
& SCF_CMD_PASSTHROUGH_NOALLOC
)
3980 if (!(T_TASK(cmd
)->t_tasks_se_num
))
3983 list_for_each_entry_safe(se_mem
, se_mem_tmp
,
3984 T_TASK(cmd
)->t_mem_list
, se_list
) {
3986 * We only release call __free_page(struct se_mem->se_page) when
3987 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3990 __free_page(se_mem
->se_page
);
3992 list_del(&se_mem
->se_list
);
3993 kmem_cache_free(se_mem_cache
, se_mem
);
3996 if (T_TASK(cmd
)->t_mem_bidi_list
&& T_TASK(cmd
)->t_tasks_se_bidi_num
) {
3997 list_for_each_entry_safe(se_mem
, se_mem_tmp
,
3998 T_TASK(cmd
)->t_mem_bidi_list
, se_list
) {
4000 * We only release call __free_page(struct se_mem->se_page) when
4001 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
4004 __free_page(se_mem
->se_page
);
4006 list_del(&se_mem
->se_list
);
4007 kmem_cache_free(se_mem_cache
, se_mem
);
4011 kfree(T_TASK(cmd
)->t_mem_bidi_list
);
4012 T_TASK(cmd
)->t_mem_bidi_list
= NULL
;
4013 kfree(T_TASK(cmd
)->t_mem_list
);
4014 T_TASK(cmd
)->t_mem_list
= NULL
;
4015 T_TASK(cmd
)->t_tasks_se_num
= 0;
4018 static inline void transport_release_tasks(struct se_cmd
*cmd
)
4020 transport_free_dev_tasks(cmd
);
4023 static inline int transport_dec_and_check(struct se_cmd
*cmd
)
4025 unsigned long flags
;
4027 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
4028 if (atomic_read(&T_TASK(cmd
)->t_fe_count
)) {
4029 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_fe_count
))) {
4030 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
4036 if (atomic_read(&T_TASK(cmd
)->t_se_count
)) {
4037 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_se_count
))) {
4038 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
4043 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4048 static void transport_release_fe_cmd(struct se_cmd
*cmd
)
4050 unsigned long flags
;
4052 if (transport_dec_and_check(cmd
))
4055 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
4056 if (!(atomic_read(&T_TASK(cmd
)->transport_dev_active
))) {
4057 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4060 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 0);
4061 transport_all_task_dev_remove_state(cmd
);
4062 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4064 transport_release_tasks(cmd
);
4066 transport_free_pages(cmd
);
4067 transport_free_se_cmd(cmd
);
4068 CMD_TFO(cmd
)->release_cmd_direct(cmd
);
4071 static int transport_generic_remove(
4073 int release_to_pool
,
4074 int session_reinstatement
)
4076 unsigned long flags
;
4081 if (transport_dec_and_check(cmd
)) {
4082 if (session_reinstatement
) {
4083 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
4084 transport_all_task_dev_remove_state(cmd
);
4085 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
4091 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
4092 if (!(atomic_read(&T_TASK(cmd
)->transport_dev_active
))) {
4093 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4096 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 0);
4097 transport_all_task_dev_remove_state(cmd
);
4098 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
4100 transport_release_tasks(cmd
);
4102 transport_free_pages(cmd
);
4105 if (release_to_pool
) {
4106 transport_release_cmd_to_pool(cmd
);
4108 transport_free_se_cmd(cmd
);
4109 CMD_TFO(cmd
)->release_cmd_direct(cmd
);
4116 * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map
4117 * @cmd: Associated se_cmd descriptor
4118 * @mem: SGL style memory for TCM WRITE / READ
4119 * @sg_mem_num: Number of SGL elements
4120 * @mem_bidi_in: SGL style memory for TCM BIDI READ
4121 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
4123 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
4126 int transport_generic_map_mem_to_cmd(
4128 struct scatterlist
*mem
,
4130 struct scatterlist
*mem_bidi_in
,
4131 u32 sg_mem_bidi_num
)
4133 u32 se_mem_cnt_out
= 0;
4136 if (!(mem
) || !(sg_mem_num
))
4139 * Passed *mem will contain a list_head containing preformatted
4140 * struct se_mem elements...
4142 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM
)) {
4143 if ((mem_bidi_in
) || (sg_mem_bidi_num
)) {
4144 printk(KERN_ERR
"SCF_CMD_PASSTHROUGH_NOALLOC not supported"
4145 " with BIDI-COMMAND\n");
4149 T_TASK(cmd
)->t_mem_list
= (struct list_head
*)mem
;
4150 T_TASK(cmd
)->t_tasks_se_num
= sg_mem_num
;
4151 cmd
->se_cmd_flags
|= SCF_CMD_PASSTHROUGH_NOALLOC
;
4155 * Otherwise, assume the caller is passing a struct scatterlist
4156 * array from include/linux/scatterlist.h
4158 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
4159 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
4161 * For CDB using TCM struct se_mem linked list scatterlist memory
4162 * processed into a TCM struct se_subsystem_dev, we do the mapping
4163 * from the passed physical memory to struct se_mem->se_page here.
4165 T_TASK(cmd
)->t_mem_list
= transport_init_se_mem_list();
4166 if (!(T_TASK(cmd
)->t_mem_list
))
4169 ret
= transport_map_sg_to_mem(cmd
,
4170 T_TASK(cmd
)->t_mem_list
, mem
, &se_mem_cnt_out
);
4174 T_TASK(cmd
)->t_tasks_se_num
= se_mem_cnt_out
;
4176 * Setup BIDI READ list of struct se_mem elements
4178 if ((mem_bidi_in
) && (sg_mem_bidi_num
)) {
4179 T_TASK(cmd
)->t_mem_bidi_list
= transport_init_se_mem_list();
4180 if (!(T_TASK(cmd
)->t_mem_bidi_list
)) {
4181 kfree(T_TASK(cmd
)->t_mem_list
);
4186 ret
= transport_map_sg_to_mem(cmd
,
4187 T_TASK(cmd
)->t_mem_bidi_list
, mem_bidi_in
,
4190 kfree(T_TASK(cmd
)->t_mem_list
);
4194 T_TASK(cmd
)->t_tasks_se_bidi_num
= se_mem_cnt_out
;
4196 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
4198 } else if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_NONSG_IO_CDB
) {
4199 if (mem_bidi_in
|| sg_mem_bidi_num
) {
4200 printk(KERN_ERR
"BIDI-Commands not supported using "
4201 "SCF_SCSI_CONTROL_NONSG_IO_CDB\n");
4205 * For incoming CDBs using a contiguous buffer internall with TCM,
4206 * save the passed struct scatterlist memory. After TCM storage object
4207 * processing has completed for this struct se_cmd, TCM core will call
4208 * transport_memcpy_[write,read]_contig() as necessary from
4209 * transport_generic_complete_ok() and transport_write_pending() in order
4210 * to copy the TCM buffer to/from the original passed *mem in SGL ->
4211 * struct scatterlist format.
4213 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_CONTIG_TO_SG
;
4214 T_TASK(cmd
)->t_task_pt_sgl
= mem
;
4219 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
4222 static inline long long transport_dev_end_lba(struct se_device
*dev
)
4224 return dev
->transport
->get_blocks(dev
) + 1;
4227 static int transport_get_sectors(struct se_cmd
*cmd
)
4229 struct se_device
*dev
= SE_DEV(cmd
);
4231 T_TASK(cmd
)->t_tasks_sectors
=
4232 (cmd
->data_length
/ DEV_ATTRIB(dev
)->block_size
);
4233 if (!(T_TASK(cmd
)->t_tasks_sectors
))
4234 T_TASK(cmd
)->t_tasks_sectors
= 1;
4236 if (TRANSPORT(dev
)->get_device_type(dev
) != TYPE_DISK
)
4239 if ((T_TASK(cmd
)->t_task_lba
+ T_TASK(cmd
)->t_tasks_sectors
) >
4240 transport_dev_end_lba(dev
)) {
4241 printk(KERN_ERR
"LBA: %llu Sectors: %u exceeds"
4242 " transport_dev_end_lba(): %llu\n",
4243 T_TASK(cmd
)->t_task_lba
, T_TASK(cmd
)->t_tasks_sectors
,
4244 transport_dev_end_lba(dev
));
4245 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
4246 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
4247 return PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
;
4253 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
4255 struct se_device
*dev
= SE_DEV(cmd
);
4256 u32 task_cdbs
= 0, rc
;
4258 if (!(cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)) {
4260 T_TASK(cmd
)->t_task_cdbs
++;
4265 * Setup any BIDI READ tasks and memory from
4266 * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks
4267 * are queued first for the non pSCSI passthrough case.
4269 if ((T_TASK(cmd
)->t_mem_bidi_list
!= NULL
) &&
4270 (TRANSPORT(dev
)->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
4271 rc
= transport_generic_get_cdb_count(cmd
,
4272 T_TASK(cmd
)->t_task_lba
,
4273 T_TASK(cmd
)->t_tasks_sectors
,
4274 DMA_FROM_DEVICE
, T_TASK(cmd
)->t_mem_bidi_list
,
4277 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
4278 cmd
->scsi_sense_reason
=
4279 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
4280 return PYX_TRANSPORT_LU_COMM_FAILURE
;
4285 * Setup the tasks and memory from T_TASK(cmd)->t_mem_list
4286 * Note for BIDI transfers this will contain the WRITE payload
4288 task_cdbs
= transport_generic_get_cdb_count(cmd
,
4289 T_TASK(cmd
)->t_task_lba
,
4290 T_TASK(cmd
)->t_tasks_sectors
,
4291 cmd
->data_direction
, T_TASK(cmd
)->t_mem_list
,
4294 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
4295 cmd
->scsi_sense_reason
=
4296 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
4297 return PYX_TRANSPORT_LU_COMM_FAILURE
;
4299 T_TASK(cmd
)->t_task_cdbs
+= task_cdbs
;
4302 printk(KERN_INFO
"data_length: %u, LBA: %llu t_tasks_sectors:"
4303 " %u, t_task_cdbs: %u\n", obj_ptr
, cmd
->data_length
,
4304 T_TASK(cmd
)->t_task_lba
, T_TASK(cmd
)->t_tasks_sectors
,
4305 T_TASK(cmd
)->t_task_cdbs
);
4309 atomic_set(&T_TASK(cmd
)->t_task_cdbs_left
, task_cdbs
);
4310 atomic_set(&T_TASK(cmd
)->t_task_cdbs_ex_left
, task_cdbs
);
4311 atomic_set(&T_TASK(cmd
)->t_task_cdbs_timeout_left
, task_cdbs
);
4315 static struct list_head
*transport_init_se_mem_list(void)
4317 struct list_head
*se_mem_list
;
4319 se_mem_list
= kzalloc(sizeof(struct list_head
), GFP_KERNEL
);
4320 if (!(se_mem_list
)) {
4321 printk(KERN_ERR
"Unable to allocate memory for se_mem_list\n");
4324 INIT_LIST_HEAD(se_mem_list
);
4330 transport_generic_get_mem(struct se_cmd
*cmd
, u32 length
, u32 dma_size
)
4333 struct se_mem
*se_mem
;
4335 T_TASK(cmd
)->t_mem_list
= transport_init_se_mem_list();
4336 if (!(T_TASK(cmd
)->t_mem_list
))
4340 * If the device uses memory mapping this is enough.
4342 if (cmd
->se_dev
->transport
->do_se_mem_map
)
4346 * Setup BIDI-COMMAND READ list of struct se_mem elements
4348 if (T_TASK(cmd
)->t_tasks_bidi
) {
4349 T_TASK(cmd
)->t_mem_bidi_list
= transport_init_se_mem_list();
4350 if (!(T_TASK(cmd
)->t_mem_bidi_list
)) {
4351 kfree(T_TASK(cmd
)->t_mem_list
);
4357 se_mem
= kmem_cache_zalloc(se_mem_cache
, GFP_KERNEL
);
4359 printk(KERN_ERR
"Unable to allocate struct se_mem\n");
4362 INIT_LIST_HEAD(&se_mem
->se_list
);
4363 se_mem
->se_len
= (length
> dma_size
) ? dma_size
: length
;
4365 /* #warning FIXME Allocate contigous pages for struct se_mem elements */
4366 se_mem
->se_page
= (struct page
*) alloc_pages(GFP_KERNEL
, 0);
4367 if (!(se_mem
->se_page
)) {
4368 printk(KERN_ERR
"alloc_pages() failed\n");
4372 buf
= kmap_atomic(se_mem
->se_page
, KM_IRQ0
);
4374 printk(KERN_ERR
"kmap_atomic() failed\n");
4377 memset(buf
, 0, se_mem
->se_len
);
4378 kunmap_atomic(buf
, KM_IRQ0
);
4380 list_add_tail(&se_mem
->se_list
, T_TASK(cmd
)->t_mem_list
);
4381 T_TASK(cmd
)->t_tasks_se_num
++;
4383 DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)"
4384 " Offset(%u)\n", se_mem
->se_page
, se_mem
->se_len
,
4387 length
-= se_mem
->se_len
;
4390 DEBUG_MEM("Allocated total struct se_mem elements(%u)\n",
4391 T_TASK(cmd
)->t_tasks_se_num
);
4398 extern u32
transport_calc_sg_num(
4399 struct se_task
*task
,
4400 struct se_mem
*in_se_mem
,
4403 struct se_cmd
*se_cmd
= task
->task_se_cmd
;
4404 struct se_device
*se_dev
= SE_DEV(se_cmd
);
4405 struct se_mem
*se_mem
= in_se_mem
;
4406 struct target_core_fabric_ops
*tfo
= CMD_TFO(se_cmd
);
4407 u32 sg_length
, task_size
= task
->task_size
, task_sg_num_padded
;
4409 while (task_size
!= 0) {
4410 DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)"
4411 " se_mem->se_off(%u) task_offset(%u)\n",
4412 se_mem
->se_page
, se_mem
->se_len
,
4413 se_mem
->se_off
, task_offset
);
4415 if (task_offset
== 0) {
4416 if (task_size
>= se_mem
->se_len
) {
4417 sg_length
= se_mem
->se_len
;
4419 if (!(list_is_last(&se_mem
->se_list
,
4420 T_TASK(se_cmd
)->t_mem_list
)))
4421 se_mem
= list_entry(se_mem
->se_list
.next
,
4422 struct se_mem
, se_list
);
4424 sg_length
= task_size
;
4425 task_size
-= sg_length
;
4429 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4430 sg_length
, task_size
);
4432 if ((se_mem
->se_len
- task_offset
) > task_size
) {
4433 sg_length
= task_size
;
4434 task_size
-= sg_length
;
4437 sg_length
= (se_mem
->se_len
- task_offset
);
4439 if (!(list_is_last(&se_mem
->se_list
,
4440 T_TASK(se_cmd
)->t_mem_list
)))
4441 se_mem
= list_entry(se_mem
->se_list
.next
,
4442 struct se_mem
, se_list
);
4445 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4446 sg_length
, task_size
);
4450 task_size
-= sg_length
;
4452 DEBUG_SC("task[%u] - Reducing task_size to(%u)\n",
4453 task
->task_no
, task_size
);
4455 task
->task_sg_num
++;
4458 * Check if the fabric module driver is requesting that all
4459 * struct se_task->task_sg[] be chained together.. If so,
4460 * then allocate an extra padding SG entry for linking and
4461 * marking the end of the chained SGL.
4463 if (tfo
->task_sg_chaining
) {
4464 task_sg_num_padded
= (task
->task_sg_num
+ 1);
4465 task
->task_padded_sg
= 1;
4467 task_sg_num_padded
= task
->task_sg_num
;
4469 task
->task_sg
= kzalloc(task_sg_num_padded
*
4470 sizeof(struct scatterlist
), GFP_KERNEL
);
4471 if (!(task
->task_sg
)) {
4472 printk(KERN_ERR
"Unable to allocate memory for"
4473 " task->task_sg\n");
4476 sg_init_table(&task
->task_sg
[0], task_sg_num_padded
);
4478 * Setup task->task_sg_bidi for SCSI READ payload for
4479 * TCM/pSCSI passthrough if present for BIDI-COMMAND
4481 if ((T_TASK(se_cmd
)->t_mem_bidi_list
!= NULL
) &&
4482 (TRANSPORT(se_dev
)->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)) {
4483 task
->task_sg_bidi
= kzalloc(task_sg_num_padded
*
4484 sizeof(struct scatterlist
), GFP_KERNEL
);
4485 if (!(task
->task_sg_bidi
)) {
4486 printk(KERN_ERR
"Unable to allocate memory for"
4487 " task->task_sg_bidi\n");
4490 sg_init_table(&task
->task_sg_bidi
[0], task_sg_num_padded
);
4493 * For the chaining case, setup the proper end of SGL for the
4494 * initial submission struct task into struct se_subsystem_api.
4495 * This will be cleared later by transport_do_task_sg_chain()
4497 if (task
->task_padded_sg
) {
4498 sg_mark_end(&task
->task_sg
[task
->task_sg_num
- 1]);
4500 * Added the 'if' check before marking end of bi-directional
4501 * scatterlist (which gets created only in case of request
4504 if (task
->task_sg_bidi
)
4505 sg_mark_end(&task
->task_sg_bidi
[task
->task_sg_num
- 1]);
4508 DEBUG_SC("Successfully allocated task->task_sg_num(%u),"
4509 " task_sg_num_padded(%u)\n", task
->task_sg_num
,
4510 task_sg_num_padded
);
4512 return task
->task_sg_num
;
4515 static inline int transport_set_tasks_sectors_disk(
4516 struct se_task
*task
,
4517 struct se_device
*dev
,
4518 unsigned long long lba
,
4520 int *max_sectors_set
)
4522 if ((lba
+ sectors
) > transport_dev_end_lba(dev
)) {
4523 task
->task_sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
4525 if (task
->task_sectors
> DEV_ATTRIB(dev
)->max_sectors
) {
4526 task
->task_sectors
= DEV_ATTRIB(dev
)->max_sectors
;
4527 *max_sectors_set
= 1;
4530 if (sectors
> DEV_ATTRIB(dev
)->max_sectors
) {
4531 task
->task_sectors
= DEV_ATTRIB(dev
)->max_sectors
;
4532 *max_sectors_set
= 1;
4534 task
->task_sectors
= sectors
;
4540 static inline int transport_set_tasks_sectors_non_disk(
4541 struct se_task
*task
,
4542 struct se_device
*dev
,
4543 unsigned long long lba
,
4545 int *max_sectors_set
)
4547 if (sectors
> DEV_ATTRIB(dev
)->max_sectors
) {
4548 task
->task_sectors
= DEV_ATTRIB(dev
)->max_sectors
;
4549 *max_sectors_set
= 1;
4551 task
->task_sectors
= sectors
;
4556 static inline int transport_set_tasks_sectors(
4557 struct se_task
*task
,
4558 struct se_device
*dev
,
4559 unsigned long long lba
,
4561 int *max_sectors_set
)
4563 return (TRANSPORT(dev
)->get_device_type(dev
) == TYPE_DISK
) ?
4564 transport_set_tasks_sectors_disk(task
, dev
, lba
, sectors
,
4566 transport_set_tasks_sectors_non_disk(task
, dev
, lba
, sectors
,
4570 static int transport_map_sg_to_mem(
4572 struct list_head
*se_mem_list
,
4576 struct se_mem
*se_mem
;
4577 struct scatterlist
*sg
;
4578 u32 sg_count
= 1, cmd_size
= cmd
->data_length
;
4581 printk(KERN_ERR
"No source scatterlist\n");
4584 sg
= (struct scatterlist
*)in_mem
;
4587 se_mem
= kmem_cache_zalloc(se_mem_cache
, GFP_KERNEL
);
4589 printk(KERN_ERR
"Unable to allocate struct se_mem\n");
4592 INIT_LIST_HEAD(&se_mem
->se_list
);
4593 DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u"
4594 " sg_page: %p offset: %d length: %d\n", cmd_size
,
4595 sg_page(sg
), sg
->offset
, sg
->length
);
4597 se_mem
->se_page
= sg_page(sg
);
4598 se_mem
->se_off
= sg
->offset
;
4600 if (cmd_size
> sg
->length
) {
4601 se_mem
->se_len
= sg
->length
;
4605 se_mem
->se_len
= cmd_size
;
4607 cmd_size
-= se_mem
->se_len
;
4609 DEBUG_MEM("sg_to_mem: *se_mem_cnt: %u cmd_size: %u\n",
4610 *se_mem_cnt
, cmd_size
);
4611 DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n",
4612 se_mem
->se_page
, se_mem
->se_off
, se_mem
->se_len
);
4614 list_add_tail(&se_mem
->se_list
, se_mem_list
);
4618 DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments to(%u)"
4619 " struct se_mem\n", sg_count
, *se_mem_cnt
);
4621 if (sg_count
!= *se_mem_cnt
)
4627 /* transport_map_mem_to_sg():
4631 int transport_map_mem_to_sg(
4632 struct se_task
*task
,
4633 struct list_head
*se_mem_list
,
4635 struct se_mem
*in_se_mem
,
4636 struct se_mem
**out_se_mem
,
4640 struct se_cmd
*se_cmd
= task
->task_se_cmd
;
4641 struct se_mem
*se_mem
= in_se_mem
;
4642 struct scatterlist
*sg
= (struct scatterlist
*)in_mem
;
4643 u32 task_size
= task
->task_size
, sg_no
= 0;
4646 printk(KERN_ERR
"Unable to locate valid struct"
4647 " scatterlist pointer\n");
4651 while (task_size
!= 0) {
4653 * Setup the contigious array of scatterlists for
4654 * this struct se_task.
4656 sg_assign_page(sg
, se_mem
->se_page
);
4658 if (*task_offset
== 0) {
4659 sg
->offset
= se_mem
->se_off
;
4661 if (task_size
>= se_mem
->se_len
) {
4662 sg
->length
= se_mem
->se_len
;
4664 if (!(list_is_last(&se_mem
->se_list
,
4665 T_TASK(se_cmd
)->t_mem_list
))) {
4666 se_mem
= list_entry(se_mem
->se_list
.next
,
4667 struct se_mem
, se_list
);
4671 sg
->length
= task_size
;
4673 * Determine if we need to calculate an offset
4674 * into the struct se_mem on the next go around..
4676 task_size
-= sg
->length
;
4678 *task_offset
= sg
->length
;
4684 sg
->offset
= (*task_offset
+ se_mem
->se_off
);
4686 if ((se_mem
->se_len
- *task_offset
) > task_size
) {
4687 sg
->length
= task_size
;
4689 * Determine if we need to calculate an offset
4690 * into the struct se_mem on the next go around..
4692 task_size
-= sg
->length
;
4694 *task_offset
+= sg
->length
;
4698 sg
->length
= (se_mem
->se_len
- *task_offset
);
4700 if (!(list_is_last(&se_mem
->se_list
,
4701 T_TASK(se_cmd
)->t_mem_list
))) {
4702 se_mem
= list_entry(se_mem
->se_list
.next
,
4703 struct se_mem
, se_list
);
4710 task_size
-= sg
->length
;
4712 DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing"
4713 " task_size to(%u), task_offset: %u\n", task
->task_no
, sg_no
,
4714 sg_page(sg
), sg
->length
, sg
->offset
, task_size
, *task_offset
);
4722 if (task_size
> se_cmd
->data_length
)
4725 *out_se_mem
= se_mem
;
4727 DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)"
4728 " SGs\n", task
->task_no
, *se_mem_cnt
, sg_no
);
4734 * This function can be used by HW target mode drivers to create a linked
4735 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4736 * This is intended to be called during the completion path by TCM Core
4737 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4739 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
4741 struct scatterlist
*sg_head
= NULL
, *sg_link
= NULL
, *sg_first
= NULL
;
4742 struct scatterlist
*sg_head_cur
= NULL
, *sg_link_cur
= NULL
;
4743 struct scatterlist
*sg
, *sg_end
= NULL
, *sg_end_cur
= NULL
;
4744 struct se_task
*task
;
4745 struct target_core_fabric_ops
*tfo
= CMD_TFO(cmd
);
4746 u32 task_sg_num
= 0, sg_count
= 0;
4749 if (tfo
->task_sg_chaining
== 0) {
4750 printk(KERN_ERR
"task_sg_chaining is diabled for fabric module:"
4751 " %s\n", tfo
->get_fabric_name());
4756 * Walk the struct se_task list and setup scatterlist chains
4757 * for each contiguosly allocated struct se_task->task_sg[].
4759 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
4760 if (!(task
->task_sg
) || !(task
->task_padded_sg
))
4763 if (sg_head
&& sg_link
) {
4764 sg_head_cur
= &task
->task_sg
[0];
4765 sg_link_cur
= &task
->task_sg
[task
->task_sg_num
];
4767 * Either add chain or mark end of scatterlist
4769 if (!(list_is_last(&task
->t_list
,
4770 &T_TASK(cmd
)->t_task_list
))) {
4772 * Clear existing SGL termination bit set in
4773 * transport_calc_sg_num(), see sg_mark_end()
4775 sg_end_cur
= &task
->task_sg
[task
->task_sg_num
- 1];
4776 sg_end_cur
->page_link
&= ~0x02;
4778 sg_chain(sg_head
, task_sg_num
, sg_head_cur
);
4779 sg_count
+= (task
->task_sg_num
+ 1);
4781 sg_count
+= task
->task_sg_num
;
4783 sg_head
= sg_head_cur
;
4784 sg_link
= sg_link_cur
;
4785 task_sg_num
= task
->task_sg_num
;
4788 sg_head
= sg_first
= &task
->task_sg
[0];
4789 sg_link
= &task
->task_sg
[task
->task_sg_num
];
4790 task_sg_num
= task
->task_sg_num
;
4792 * Check for single task..
4794 if (!(list_is_last(&task
->t_list
, &T_TASK(cmd
)->t_task_list
))) {
4796 * Clear existing SGL termination bit set in
4797 * transport_calc_sg_num(), see sg_mark_end()
4799 sg_end
= &task
->task_sg
[task
->task_sg_num
- 1];
4800 sg_end
->page_link
&= ~0x02;
4801 sg_count
+= (task
->task_sg_num
+ 1);
4803 sg_count
+= task
->task_sg_num
;
4806 * Setup the starting pointer and total t_tasks_sg_linked_no including
4807 * padding SGs for linking and to mark the end.
4809 T_TASK(cmd
)->t_tasks_sg_chained
= sg_first
;
4810 T_TASK(cmd
)->t_tasks_sg_chained_no
= sg_count
;
4812 DEBUG_CMD_M("Setup T_TASK(cmd)->t_tasks_sg_chained: %p and"
4813 " t_tasks_sg_chained_no: %u\n", T_TASK(cmd
)->t_tasks_sg_chained
,
4814 T_TASK(cmd
)->t_tasks_sg_chained_no
);
4816 for_each_sg(T_TASK(cmd
)->t_tasks_sg_chained
, sg
,
4817 T_TASK(cmd
)->t_tasks_sg_chained_no
, i
) {
4819 DEBUG_CMD_M("SG: %p page: %p length: %d offset: %d\n",
4820 sg
, sg_page(sg
), sg
->length
, sg
->offset
);
4821 if (sg_is_chain(sg
))
4822 DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg
);
4824 DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg
);
4828 EXPORT_SYMBOL(transport_do_task_sg_chain
);
4830 static int transport_do_se_mem_map(
4831 struct se_device
*dev
,
4832 struct se_task
*task
,
4833 struct list_head
*se_mem_list
,
4835 struct se_mem
*in_se_mem
,
4836 struct se_mem
**out_se_mem
,
4838 u32
*task_offset_in
)
4840 u32 task_offset
= *task_offset_in
;
4843 * se_subsystem_api_t->do_se_mem_map is used when internal allocation
4844 * has been done by the transport plugin.
4846 if (TRANSPORT(dev
)->do_se_mem_map
) {
4847 ret
= TRANSPORT(dev
)->do_se_mem_map(task
, se_mem_list
,
4848 in_mem
, in_se_mem
, out_se_mem
, se_mem_cnt
,
4851 T_TASK(task
->task_se_cmd
)->t_tasks_se_num
+= *se_mem_cnt
;
4856 BUG_ON(list_empty(se_mem_list
));
4858 * This is the normal path for all normal non BIDI and BIDI-COMMAND
4859 * WRITE payloads.. If we need to do BIDI READ passthrough for
4860 * TCM/pSCSI the first call to transport_do_se_mem_map ->
4861 * transport_calc_sg_num() -> transport_map_mem_to_sg() will do the
4862 * allocation for task->task_sg_bidi, and the subsequent call to
4863 * transport_do_se_mem_map() from transport_generic_get_cdb_count()
4865 if (!(task
->task_sg_bidi
)) {
4867 * Assume default that transport plugin speaks preallocated
4870 if (!(transport_calc_sg_num(task
, in_se_mem
, task_offset
)))
4873 * struct se_task->task_sg now contains the struct scatterlist array.
4875 return transport_map_mem_to_sg(task
, se_mem_list
, task
->task_sg
,
4876 in_se_mem
, out_se_mem
, se_mem_cnt
,
4880 * Handle the se_mem_list -> struct task->task_sg_bidi
4881 * memory map for the extra BIDI READ payload
4883 return transport_map_mem_to_sg(task
, se_mem_list
, task
->task_sg_bidi
,
4884 in_se_mem
, out_se_mem
, se_mem_cnt
,
4888 static u32
transport_generic_get_cdb_count(
4890 unsigned long long lba
,
4892 enum dma_data_direction data_direction
,
4893 struct list_head
*mem_list
,
4896 unsigned char *cdb
= NULL
;
4897 struct se_task
*task
;
4898 struct se_mem
*se_mem
= NULL
, *se_mem_lout
= NULL
;
4899 struct se_mem
*se_mem_bidi
= NULL
, *se_mem_bidi_lout
= NULL
;
4900 struct se_device
*dev
= SE_DEV(cmd
);
4901 int max_sectors_set
= 0, ret
;
4902 u32 task_offset_in
= 0, se_mem_cnt
= 0, se_mem_bidi_cnt
= 0, task_cdbs
= 0;
4905 printk(KERN_ERR
"mem_list is NULL in transport_generic_get"
4910 * While using RAMDISK_DR backstores is the only case where
4911 * mem_list will ever be empty at this point.
4913 if (!(list_empty(mem_list
)))
4914 se_mem
= list_entry(mem_list
->next
, struct se_mem
, se_list
);
4916 * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to
4917 * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation
4919 if ((T_TASK(cmd
)->t_mem_bidi_list
!= NULL
) &&
4920 !(list_empty(T_TASK(cmd
)->t_mem_bidi_list
)) &&
4921 (TRANSPORT(dev
)->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
))
4922 se_mem_bidi
= list_entry(T_TASK(cmd
)->t_mem_bidi_list
->next
,
4923 struct se_mem
, se_list
);
4926 DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n",
4927 CMD_TFO(cmd
)->get_task_tag(cmd
), lba
, sectors
,
4928 transport_dev_end_lba(dev
));
4930 task
= transport_generic_get_task(cmd
, data_direction
);
4934 transport_set_tasks_sectors(task
, dev
, lba
, sectors
,
4937 task
->task_lba
= lba
;
4938 lba
+= task
->task_sectors
;
4939 sectors
-= task
->task_sectors
;
4940 task
->task_size
= (task
->task_sectors
*
4941 DEV_ATTRIB(dev
)->block_size
);
4943 cdb
= TRANSPORT(dev
)->get_cdb(task
);
4945 memcpy(cdb
, T_TASK(cmd
)->t_task_cdb
,
4946 scsi_command_size(T_TASK(cmd
)->t_task_cdb
));
4947 cmd
->transport_split_cdb(task
->task_lba
,
4948 &task
->task_sectors
, cdb
);
4952 * Perform the SE OBJ plugin and/or Transport plugin specific
4953 * mapping for T_TASK(cmd)->t_mem_list. And setup the
4954 * task->task_sg and if necessary task->task_sg_bidi
4956 ret
= transport_do_se_mem_map(dev
, task
, mem_list
,
4957 NULL
, se_mem
, &se_mem_lout
, &se_mem_cnt
,
4962 se_mem
= se_mem_lout
;
4964 * Setup the T_TASK(cmd)->t_mem_bidi_list -> task->task_sg_bidi
4965 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI
4967 * Note that the first call to transport_do_se_mem_map() above will
4968 * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map()
4969 * -> transport_calc_sg_num(), and the second here will do the
4970 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI.
4972 if (task
->task_sg_bidi
!= NULL
) {
4973 ret
= transport_do_se_mem_map(dev
, task
,
4974 T_TASK(cmd
)->t_mem_bidi_list
, NULL
,
4975 se_mem_bidi
, &se_mem_bidi_lout
, &se_mem_bidi_cnt
,
4980 se_mem_bidi
= se_mem_bidi_lout
;
4984 DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
4985 task_cdbs
, task
->task_sg_num
);
4987 if (max_sectors_set
) {
4988 max_sectors_set
= 0;
4997 atomic_inc(&T_TASK(cmd
)->t_fe_count
);
4998 atomic_inc(&T_TASK(cmd
)->t_se_count
);
5001 DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
5002 CMD_TFO(cmd
)->get_task_tag(cmd
), (data_direction
== DMA_TO_DEVICE
)
5003 ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs
);
5011 transport_map_control_cmd_to_task(struct se_cmd
*cmd
)
5013 struct se_device
*dev
= SE_DEV(cmd
);
5015 struct se_task
*task
;
5018 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
5020 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
;
5022 cdb
= TRANSPORT(dev
)->get_cdb(task
);
5024 memcpy(cdb
, cmd
->t_task
->t_task_cdb
,
5025 scsi_command_size(cmd
->t_task
->t_task_cdb
));
5027 task
->task_size
= cmd
->data_length
;
5029 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) ? 1 : 0;
5031 atomic_inc(&cmd
->t_task
->t_fe_count
);
5032 atomic_inc(&cmd
->t_task
->t_se_count
);
5034 if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) {
5035 struct se_mem
*se_mem
= NULL
, *se_mem_lout
= NULL
;
5036 u32 se_mem_cnt
= 0, task_offset
= 0;
5038 if (!list_empty(T_TASK(cmd
)->t_mem_list
))
5039 se_mem
= list_entry(T_TASK(cmd
)->t_mem_list
->next
,
5040 struct se_mem
, se_list
);
5042 ret
= transport_do_se_mem_map(dev
, task
,
5043 cmd
->t_task
->t_mem_list
, NULL
, se_mem
,
5044 &se_mem_lout
, &se_mem_cnt
, &task_offset
);
5046 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
;
5048 if (dev
->transport
->map_task_SG
)
5049 return dev
->transport
->map_task_SG(task
);
5051 } else if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_NONSG_IO_CDB
) {
5052 if (dev
->transport
->map_task_non_SG
)
5053 return dev
->transport
->map_task_non_SG(task
);
5055 } else if (cmd
->se_cmd_flags
& SCF_SCSI_NON_DATA_CDB
) {
5056 if (dev
->transport
->cdb_none
)
5057 return dev
->transport
->cdb_none(task
);
5061 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
;
5065 /* transport_generic_new_cmd(): Called from transport_processing_thread()
5067 * Allocate storage transport resources from a set of values predefined
5068 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
5069 * Any non zero return here is treated as an "out of resource' op here.
5072 * Generate struct se_task(s) and/or their payloads for this CDB.
5074 static int transport_generic_new_cmd(struct se_cmd
*cmd
)
5076 struct se_portal_group
*se_tpg
;
5077 struct se_task
*task
;
5078 struct se_device
*dev
= SE_DEV(cmd
);
5082 * Determine is the TCM fabric module has already allocated physical
5083 * memory, and is directly calling transport_generic_map_mem_to_cmd()
5084 * to setup beforehand the linked list of physical memory at
5085 * T_TASK(cmd)->t_mem_list of struct se_mem->se_page
5087 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)) {
5088 ret
= transport_allocate_resources(cmd
);
5093 ret
= transport_get_sectors(cmd
);
5097 ret
= transport_new_cmd_obj(cmd
);
5102 * Determine if the calling TCM fabric module is talking to
5103 * Linux/NET via kernel sockets and needs to allocate a
5104 * struct iovec array to complete the struct se_cmd
5106 se_tpg
= SE_LUN(cmd
)->lun_sep
->sep_tpg
;
5107 if (TPG_TFO(se_tpg
)->alloc_cmd_iovecs
!= NULL
) {
5108 ret
= TPG_TFO(se_tpg
)->alloc_cmd_iovecs(cmd
);
5110 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
;
5113 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
5114 list_for_each_entry(task
, &T_TASK(cmd
)->t_task_list
, t_list
) {
5115 if (atomic_read(&task
->task_sent
))
5117 if (!dev
->transport
->map_task_SG
)
5120 ret
= dev
->transport
->map_task_SG(task
);
5125 ret
= transport_map_control_cmd_to_task(cmd
);
5131 * For WRITEs, let the iSCSI Target RX Thread know its buffer is ready..
5132 * This WRITE struct se_cmd (and all of its associated struct se_task's)
5133 * will be added to the struct se_device execution queue after its WRITE
5134 * data has arrived. (ie: It gets handled by the transport processing
5135 * thread a second time)
5137 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
5138 transport_add_tasks_to_state_queue(cmd
);
5139 return transport_generic_write_pending(cmd
);
5142 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
5143 * to the execution queue.
5145 transport_execute_tasks(cmd
);
5149 /* transport_generic_process_write():
5153 void transport_generic_process_write(struct se_cmd
*cmd
)
5157 * Copy SCSI Presented DTL sector(s) from received buffers allocated to
5160 if (cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
5161 if (!T_TASK(cmd
)->t_tasks_se_num
) {
5162 unsigned char *dst
, *buf
=
5163 (unsigned char *)T_TASK(cmd
)->t_task_buf
;
5165 dst
= kzalloc(cmd
->cmd_spdtl
), GFP_KERNEL
);
5167 printk(KERN_ERR
"Unable to allocate memory for"
5168 " WRITE underflow\n");
5169 transport_generic_request_failure(cmd
, NULL
,
5170 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
, 1);
5173 memcpy(dst
, buf
, cmd
->cmd_spdtl
);
5175 kfree(T_TASK(cmd
)->t_task_buf
);
5176 T_TASK(cmd
)->t_task_buf
= dst
;
5178 struct scatterlist
*sg
=
5179 (struct scatterlist
*sg
)T_TASK(cmd
)->t_task_buf
;
5180 struct scatterlist
*orig_sg
;
5182 orig_sg
= kzalloc(sizeof(struct scatterlist
) *
5183 T_TASK(cmd
)->t_tasks_se_num
,
5186 printk(KERN_ERR
"Unable to allocate memory"
5187 " for WRITE underflow\n");
5188 transport_generic_request_failure(cmd
, NULL
,
5189 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
, 1);
5193 memcpy(orig_sg
, T_TASK(cmd
)->t_task_buf
,
5194 sizeof(struct scatterlist
) *
5195 T_TASK(cmd
)->t_tasks_se_num
);
5197 cmd
->data_length
= cmd
->cmd_spdtl
;
5199 * FIXME, clear out original struct se_task and state
5202 if (transport_generic_new_cmd(cmd
) < 0) {
5203 transport_generic_request_failure(cmd
, NULL
,
5204 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
, 1);
5209 transport_memcpy_write_sg(cmd
, orig_sg
);
5213 transport_execute_tasks(cmd
);
5215 EXPORT_SYMBOL(transport_generic_process_write
);
5217 /* transport_generic_write_pending():
5221 static int transport_generic_write_pending(struct se_cmd
*cmd
)
5223 unsigned long flags
;
5226 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5227 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
5228 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5230 * For the TCM control CDBs using a contiguous buffer, do the memcpy
5231 * from the passed Linux/SCSI struct scatterlist located at
5232 * T_TASK(se_cmd)->t_task_pt_buf to the contiguous buffer at
5233 * T_TASK(se_cmd)->t_task_buf.
5235 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_CONTIG_TO_SG
)
5236 transport_memcpy_read_contig(cmd
,
5237 T_TASK(cmd
)->t_task_buf
,
5238 T_TASK(cmd
)->t_task_pt_sgl
);
5240 * Clear the se_cmd for WRITE_PENDING status in order to set
5241 * T_TASK(cmd)->t_transport_active=0 so that transport_generic_handle_data
5242 * can be called from HW target mode interrupt code. This is safe
5243 * to be called with transport_off=1 before the CMD_TFO(cmd)->write_pending
5244 * because the se_cmd->se_lun pointer is not being cleared.
5246 transport_cmd_check_stop(cmd
, 1, 0);
5249 * Call the fabric write_pending function here to let the
5250 * frontend know that WRITE buffers are ready.
5252 ret
= CMD_TFO(cmd
)->write_pending(cmd
);
5256 return PYX_TRANSPORT_WRITE_PENDING
;
5259 /* transport_release_cmd_to_pool():
5263 void transport_release_cmd_to_pool(struct se_cmd
*cmd
)
5265 BUG_ON(!T_TASK(cmd
));
5266 BUG_ON(!CMD_TFO(cmd
));
5268 transport_free_se_cmd(cmd
);
5269 CMD_TFO(cmd
)->release_cmd_to_pool(cmd
);
5271 EXPORT_SYMBOL(transport_release_cmd_to_pool
);
5273 /* transport_generic_free_cmd():
5275 * Called from processing frontend to release storage engine resources
5277 void transport_generic_free_cmd(
5280 int release_to_pool
,
5281 int session_reinstatement
)
5283 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) || !T_TASK(cmd
))
5284 transport_release_cmd_to_pool(cmd
);
5286 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
5290 printk(KERN_INFO
"cmd: %p ITT: 0x%08x contains"
5291 " SE_LUN(cmd)\n", cmd
,
5292 CMD_TFO(cmd
)->get_task_tag(cmd
));
5294 transport_lun_remove_cmd(cmd
);
5297 if (wait_for_tasks
&& cmd
->transport_wait_for_tasks
)
5298 cmd
->transport_wait_for_tasks(cmd
, 0, 0);
5300 transport_generic_remove(cmd
, release_to_pool
,
5301 session_reinstatement
);
5304 EXPORT_SYMBOL(transport_generic_free_cmd
);
5306 static void transport_nop_wait_for_tasks(
5309 int session_reinstatement
)
5314 /* transport_lun_wait_for_tasks():
5316 * Called from ConfigFS context to stop the passed struct se_cmd to allow
5317 * an struct se_lun to be successfully shutdown.
5319 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
5321 unsigned long flags
;
5324 * If the frontend has already requested this struct se_cmd to
5325 * be stopped, we can safely ignore this struct se_cmd.
5327 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5328 if (atomic_read(&T_TASK(cmd
)->t_transport_stop
)) {
5329 atomic_set(&T_TASK(cmd
)->transport_lun_stop
, 0);
5330 DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop =="
5331 " TRUE, skipping\n", CMD_TFO(cmd
)->get_task_tag(cmd
));
5332 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5333 transport_cmd_check_stop(cmd
, 1, 0);
5336 atomic_set(&T_TASK(cmd
)->transport_lun_fe_stop
, 1);
5337 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5339 wake_up_interruptible(&SE_DEV(cmd
)->dev_queue_obj
->thread_wq
);
5341 ret
= transport_stop_tasks_for_cmd(cmd
);
5343 DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:"
5344 " %d\n", cmd
, T_TASK(cmd
)->t_task_cdbs
, ret
);
5346 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
5347 CMD_TFO(cmd
)->get_task_tag(cmd
));
5348 wait_for_completion(&T_TASK(cmd
)->transport_lun_stop_comp
);
5349 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
5350 CMD_TFO(cmd
)->get_task_tag(cmd
));
5352 transport_remove_cmd_from_queue(cmd
, SE_DEV(cmd
)->dev_queue_obj
);
5357 /* #define DEBUG_CLEAR_LUN */
5358 #ifdef DEBUG_CLEAR_LUN
5359 #define DEBUG_CLEAR_L(x...) printk(KERN_INFO x)
5361 #define DEBUG_CLEAR_L(x...)
5364 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
5366 struct se_cmd
*cmd
= NULL
;
5367 unsigned long lun_flags
, cmd_flags
;
5369 * Do exception processing and return CHECK_CONDITION status to the
5372 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
5373 while (!list_empty_careful(&lun
->lun_cmd_list
)) {
5374 cmd
= list_entry(lun
->lun_cmd_list
.next
,
5375 struct se_cmd
, se_lun_list
);
5376 list_del(&cmd
->se_lun_list
);
5378 if (!(T_TASK(cmd
))) {
5379 printk(KERN_ERR
"ITT: 0x%08x, T_TASK(cmd) = NULL"
5380 "[i,t]_state: %u/%u\n",
5381 CMD_TFO(cmd
)->get_task_tag(cmd
),
5382 CMD_TFO(cmd
)->get_cmd_state(cmd
), cmd
->t_state
);
5385 atomic_set(&T_TASK(cmd
)->transport_lun_active
, 0);
5387 * This will notify iscsi_target_transport.c:
5388 * transport_cmd_check_stop() that a LUN shutdown is in
5389 * progress for the iscsi_cmd_t.
5391 spin_lock(&T_TASK(cmd
)->t_state_lock
);
5392 DEBUG_CLEAR_L("SE_LUN[%d] - Setting T_TASK(cmd)->transport"
5393 "_lun_stop for ITT: 0x%08x\n",
5394 SE_LUN(cmd
)->unpacked_lun
,
5395 CMD_TFO(cmd
)->get_task_tag(cmd
));
5396 atomic_set(&T_TASK(cmd
)->transport_lun_stop
, 1);
5397 spin_unlock(&T_TASK(cmd
)->t_state_lock
);
5399 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
5401 if (!(SE_LUN(cmd
))) {
5402 printk(KERN_ERR
"ITT: 0x%08x, [i,t]_state: %u/%u\n",
5403 CMD_TFO(cmd
)->get_task_tag(cmd
),
5404 CMD_TFO(cmd
)->get_cmd_state(cmd
), cmd
->t_state
);
5408 * If the Storage engine still owns the iscsi_cmd_t, determine
5409 * and/or stop its context.
5411 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport"
5412 "_lun_wait_for_tasks()\n", SE_LUN(cmd
)->unpacked_lun
,
5413 CMD_TFO(cmd
)->get_task_tag(cmd
));
5415 if (transport_lun_wait_for_tasks(cmd
, SE_LUN(cmd
)) < 0) {
5416 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
5420 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
5421 "_wait_for_tasks(): SUCCESS\n",
5422 SE_LUN(cmd
)->unpacked_lun
,
5423 CMD_TFO(cmd
)->get_task_tag(cmd
));
5425 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5426 if (!(atomic_read(&T_TASK(cmd
)->transport_dev_active
))) {
5427 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5430 atomic_set(&T_TASK(cmd
)->transport_dev_active
, 0);
5431 transport_all_task_dev_remove_state(cmd
);
5432 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5434 transport_free_dev_tasks(cmd
);
5436 * The Storage engine stopped this struct se_cmd before it was
5437 * send to the fabric frontend for delivery back to the
5438 * Initiator Node. Return this SCSI CDB back with an
5439 * CHECK_CONDITION status.
5442 transport_send_check_condition_and_sense(cmd
,
5443 TCM_NON_EXISTENT_LUN
, 0);
5445 * If the fabric frontend is waiting for this iscsi_cmd_t to
5446 * be released, notify the waiting thread now that LU has
5447 * finished accessing it.
5449 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5450 if (atomic_read(&T_TASK(cmd
)->transport_lun_fe_stop
)) {
5451 DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for"
5452 " struct se_cmd: %p ITT: 0x%08x\n",
5454 cmd
, CMD_TFO(cmd
)->get_task_tag(cmd
));
5456 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
,
5458 transport_cmd_check_stop(cmd
, 1, 0);
5459 complete(&T_TASK(cmd
)->transport_lun_fe_stop_comp
);
5460 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
5463 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
5464 lun
->unpacked_lun
, CMD_TFO(cmd
)->get_task_tag(cmd
));
5466 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, cmd_flags
);
5467 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
5469 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
5472 static int transport_clear_lun_thread(void *p
)
5474 struct se_lun
*lun
= (struct se_lun
*)p
;
5476 __transport_clear_lun_from_sessions(lun
);
5477 complete(&lun
->lun_shutdown_comp
);
5482 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
5484 struct task_struct
*kt
;
5486 kt
= kthread_run(transport_clear_lun_thread
, (void *)lun
,
5487 "tcm_cl_%u", lun
->unpacked_lun
);
5489 printk(KERN_ERR
"Unable to start clear_lun thread\n");
5492 wait_for_completion(&lun
->lun_shutdown_comp
);
5497 /* transport_generic_wait_for_tasks():
5499 * Called from frontend or passthrough context to wait for storage engine
5500 * to pause and/or release frontend generated struct se_cmd.
5502 static void transport_generic_wait_for_tasks(
5505 int session_reinstatement
)
5507 unsigned long flags
;
5509 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
))
5512 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5514 * If we are already stopped due to an external event (ie: LUN shutdown)
5515 * sleep until the connection can have the passed struct se_cmd back.
5516 * The T_TASK(cmd)->transport_lun_stopped_sem will be upped by
5517 * transport_clear_lun_from_sessions() once the ConfigFS context caller
5518 * has completed its operation on the struct se_cmd.
5520 if (atomic_read(&T_TASK(cmd
)->transport_lun_stop
)) {
5522 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping"
5523 " wait_for_completion(&T_TASK(cmd)transport_lun_fe"
5524 "_stop_comp); for ITT: 0x%08x\n",
5525 CMD_TFO(cmd
)->get_task_tag(cmd
));
5527 * There is a special case for WRITES where a FE exception +
5528 * LUN shutdown means ConfigFS context is still sleeping on
5529 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
5530 * We go ahead and up transport_lun_stop_comp just to be sure
5533 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5534 complete(&T_TASK(cmd
)->transport_lun_stop_comp
);
5535 wait_for_completion(&T_TASK(cmd
)->transport_lun_fe_stop_comp
);
5536 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5538 transport_all_task_dev_remove_state(cmd
);
5540 * At this point, the frontend who was the originator of this
5541 * struct se_cmd, now owns the structure and can be released through
5542 * normal means below.
5544 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped"
5545 " wait_for_completion(&T_TASK(cmd)transport_lun_fe_"
5546 "stop_comp); for ITT: 0x%08x\n",
5547 CMD_TFO(cmd
)->get_task_tag(cmd
));
5549 atomic_set(&T_TASK(cmd
)->transport_lun_stop
, 0);
5551 if (!atomic_read(&T_TASK(cmd
)->t_transport_active
) ||
5552 atomic_read(&T_TASK(cmd
)->t_transport_aborted
))
5555 atomic_set(&T_TASK(cmd
)->t_transport_stop
, 1);
5557 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x"
5558 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
5559 " = TRUE\n", cmd
, CMD_TFO(cmd
)->get_task_tag(cmd
),
5560 CMD_TFO(cmd
)->get_cmd_state(cmd
), cmd
->t_state
,
5561 cmd
->deferred_t_state
);
5563 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5565 wake_up_interruptible(&SE_DEV(cmd
)->dev_queue_obj
->thread_wq
);
5567 wait_for_completion(&T_TASK(cmd
)->t_transport_stop_comp
);
5569 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5570 atomic_set(&T_TASK(cmd
)->t_transport_active
, 0);
5571 atomic_set(&T_TASK(cmd
)->t_transport_stop
, 0);
5573 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion("
5574 "&T_TASK(cmd)->t_transport_stop_comp) for ITT: 0x%08x\n",
5575 CMD_TFO(cmd
)->get_task_tag(cmd
));
5577 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5581 transport_generic_free_cmd(cmd
, 0, 0, session_reinstatement
);
5584 static int transport_get_sense_codes(
5589 *asc
= cmd
->scsi_asc
;
5590 *ascq
= cmd
->scsi_ascq
;
5595 static int transport_set_sense_codes(
5600 cmd
->scsi_asc
= asc
;
5601 cmd
->scsi_ascq
= ascq
;
5606 int transport_send_check_condition_and_sense(
5611 unsigned char *buffer
= cmd
->sense_buffer
;
5612 unsigned long flags
;
5614 u8 asc
= 0, ascq
= 0;
5616 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5617 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
5618 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5621 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
5622 spin_unlock_irqrestore(&T_TASK(cmd
)->t_state_lock
, flags
);
5624 if (!reason
&& from_transport
)
5627 if (!from_transport
)
5628 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
5630 * Data Segment and SenseLength of the fabric response PDU.
5632 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
5633 * from include/scsi/scsi_cmnd.h
5635 offset
= CMD_TFO(cmd
)->set_fabric_sense_len(cmd
,
5636 TRANSPORT_SENSE_BUFFER
);
5638 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
5639 * SENSE KEY values from include/scsi/scsi.h
5642 case TCM_NON_EXISTENT_LUN
:
5643 case TCM_UNSUPPORTED_SCSI_OPCODE
:
5644 case TCM_SECTOR_COUNT_TOO_MANY
:
5646 buffer
[offset
] = 0x70;
5647 /* ILLEGAL REQUEST */
5648 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
5649 /* INVALID COMMAND OPERATION CODE */
5650 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
5652 case TCM_UNKNOWN_MODE_PAGE
:
5654 buffer
[offset
] = 0x70;
5655 /* ILLEGAL REQUEST */
5656 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
5657 /* INVALID FIELD IN CDB */
5658 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
5660 case TCM_CHECK_CONDITION_ABORT_CMD
:
5662 buffer
[offset
] = 0x70;
5663 /* ABORTED COMMAND */
5664 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5665 /* BUS DEVICE RESET FUNCTION OCCURRED */
5666 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
5667 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
5669 case TCM_INCORRECT_AMOUNT_OF_DATA
:
5671 buffer
[offset
] = 0x70;
5672 /* ABORTED COMMAND */
5673 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5675 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
5676 /* NOT ENOUGH UNSOLICITED DATA */
5677 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
5679 case TCM_INVALID_CDB_FIELD
:
5681 buffer
[offset
] = 0x70;
5682 /* ABORTED COMMAND */
5683 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5684 /* INVALID FIELD IN CDB */
5685 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
5687 case TCM_INVALID_PARAMETER_LIST
:
5689 buffer
[offset
] = 0x70;
5690 /* ABORTED COMMAND */
5691 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5692 /* INVALID FIELD IN PARAMETER LIST */
5693 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
5695 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
5697 buffer
[offset
] = 0x70;
5698 /* ABORTED COMMAND */
5699 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5701 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
5702 /* UNEXPECTED_UNSOLICITED_DATA */
5703 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
5705 case TCM_SERVICE_CRC_ERROR
:
5707 buffer
[offset
] = 0x70;
5708 /* ABORTED COMMAND */
5709 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5710 /* PROTOCOL SERVICE CRC ERROR */
5711 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
5713 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
5715 case TCM_SNACK_REJECTED
:
5717 buffer
[offset
] = 0x70;
5718 /* ABORTED COMMAND */
5719 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
5721 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
5722 /* FAILED RETRANSMISSION REQUEST */
5723 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
5725 case TCM_WRITE_PROTECTED
:
5727 buffer
[offset
] = 0x70;
5729 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
5730 /* WRITE PROTECTED */
5731 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
5733 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
5735 buffer
[offset
] = 0x70;
5736 /* UNIT ATTENTION */
5737 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
5738 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
5739 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
5740 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
5742 case TCM_CHECK_CONDITION_NOT_READY
:
5744 buffer
[offset
] = 0x70;
5746 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
5747 transport_get_sense_codes(cmd
, &asc
, &ascq
);
5748 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
5749 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
5751 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
5754 buffer
[offset
] = 0x70;
5755 /* ILLEGAL REQUEST */
5756 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
5757 /* LOGICAL UNIT COMMUNICATION FAILURE */
5758 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
5762 * This code uses linux/include/scsi/scsi.h SAM status codes!
5764 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
5766 * Automatically padded, this value is encoded in the fabric's
5767 * data_length response PDU containing the SCSI defined sense data.
5769 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
5772 CMD_TFO(cmd
)->queue_status(cmd
);
5775 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
5777 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
5781 if (atomic_read(&T_TASK(cmd
)->t_transport_aborted
) != 0) {
5782 if (!(send_status
) ||
5783 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
5786 printk(KERN_INFO
"Sending delayed SAM_STAT_TASK_ABORTED"
5787 " status for CDB: 0x%02x ITT: 0x%08x\n",
5788 T_TASK(cmd
)->t_task_cdb
[0],
5789 CMD_TFO(cmd
)->get_task_tag(cmd
));
5791 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
5792 CMD_TFO(cmd
)->queue_status(cmd
);
5797 EXPORT_SYMBOL(transport_check_aborted_status
);
5799 void transport_send_task_abort(struct se_cmd
*cmd
)
5802 * If there are still expected incoming fabric WRITEs, we wait
5803 * until until they have completed before sending a TASK_ABORTED
5804 * response. This response with TASK_ABORTED status will be
5805 * queued back to fabric module by transport_check_aborted_status().
5807 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
5808 if (CMD_TFO(cmd
)->write_pending_status(cmd
) != 0) {
5809 atomic_inc(&T_TASK(cmd
)->t_transport_aborted
);
5810 smp_mb__after_atomic_inc();
5811 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
5812 transport_new_cmd_failure(cmd
);
5816 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
5818 printk(KERN_INFO
"Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
5819 " ITT: 0x%08x\n", T_TASK(cmd
)->t_task_cdb
[0],
5820 CMD_TFO(cmd
)->get_task_tag(cmd
));
5822 CMD_TFO(cmd
)->queue_status(cmd
);
5825 /* transport_generic_do_tmr():
5829 int transport_generic_do_tmr(struct se_cmd
*cmd
)
5831 struct se_cmd
*ref_cmd
;
5832 struct se_device
*dev
= SE_DEV(cmd
);
5833 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
5836 switch (tmr
->function
) {
5838 ref_cmd
= tmr
->ref_cmd
;
5839 tmr
->response
= TMR_FUNCTION_REJECTED
;
5841 case ABORT_TASK_SET
:
5843 case CLEAR_TASK_SET
:
5844 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
5847 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
5848 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
5849 TMR_FUNCTION_REJECTED
;
5852 case TARGET_WARM_RESET
:
5853 transport_generic_host_reset(dev
->se_hba
);
5854 tmr
->response
= TMR_FUNCTION_REJECTED
;
5856 case TARGET_COLD_RESET
:
5857 transport_generic_host_reset(dev
->se_hba
);
5858 transport_generic_cold_reset(dev
->se_hba
);
5859 tmr
->response
= TMR_FUNCTION_REJECTED
;
5863 printk(KERN_ERR
"Uknown TMR function: 0x%02x.\n",
5865 tmr
->response
= TMR_FUNCTION_REJECTED
;
5869 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
5870 CMD_TFO(cmd
)->queue_tm_rsp(cmd
);
5872 transport_cmd_check_stop(cmd
, 2, 0);
5877 * Called with spin_lock_irq(&dev->execute_task_lock); held
5880 static struct se_task
*
5881 transport_get_task_from_state_list(struct se_device
*dev
)
5883 struct se_task
*task
;
5885 if (list_empty(&dev
->state_task_list
))
5888 list_for_each_entry(task
, &dev
->state_task_list
, t_state_list
)
5891 list_del(&task
->t_state_list
);
5892 atomic_set(&task
->task_state_active
, 0);
5897 static void transport_processing_shutdown(struct se_device
*dev
)
5900 struct se_queue_req
*qr
;
5901 struct se_task
*task
;
5903 unsigned long flags
;
5905 * Empty the struct se_device's struct se_task state list.
5907 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5908 while ((task
= transport_get_task_from_state_list(dev
))) {
5909 if (!(TASK_CMD(task
))) {
5910 printk(KERN_ERR
"TASK_CMD(task) is NULL!\n");
5913 cmd
= TASK_CMD(task
);
5916 printk(KERN_ERR
"T_TASK(cmd) is NULL for task: %p cmd:"
5917 " %p ITT: 0x%08x\n", task
, cmd
,
5918 CMD_TFO(cmd
)->get_task_tag(cmd
));
5921 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
5923 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5925 DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x,"
5926 " i_state/def_i_state: %d/%d, t_state/def_t_state:"
5927 " %d/%d cdb: 0x%02x\n", cmd
, task
,
5928 CMD_TFO(cmd
)->get_task_tag(cmd
), cmd
->cmd_sn
,
5929 CMD_TFO(cmd
)->get_cmd_state(cmd
), cmd
->deferred_i_state
,
5930 cmd
->t_state
, cmd
->deferred_t_state
,
5931 T_TASK(cmd
)->t_task_cdb
[0]);
5932 DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:"
5933 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5934 " t_transport_stop: %d t_transport_sent: %d\n",
5935 CMD_TFO(cmd
)->get_task_tag(cmd
),
5936 T_TASK(cmd
)->t_task_cdbs
,
5937 atomic_read(&T_TASK(cmd
)->t_task_cdbs_left
),
5938 atomic_read(&T_TASK(cmd
)->t_task_cdbs_sent
),
5939 atomic_read(&T_TASK(cmd
)->t_transport_active
),
5940 atomic_read(&T_TASK(cmd
)->t_transport_stop
),
5941 atomic_read(&T_TASK(cmd
)->t_transport_sent
));
5943 if (atomic_read(&task
->task_active
)) {
5944 atomic_set(&task
->task_stop
, 1);
5945 spin_unlock_irqrestore(
5946 &T_TASK(cmd
)->t_state_lock
, flags
);
5948 DEBUG_DO("Waiting for task: %p to shutdown for dev:"
5949 " %p\n", task
, dev
);
5950 wait_for_completion(&task
->task_stop_comp
);
5951 DEBUG_DO("Completed task: %p shutdown for dev: %p\n",
5954 spin_lock_irqsave(&T_TASK(cmd
)->t_state_lock
, flags
);
5955 atomic_dec(&T_TASK(cmd
)->t_task_cdbs_left
);
5957 atomic_set(&task
->task_active
, 0);
5958 atomic_set(&task
->task_stop
, 0);
5960 if (atomic_read(&task
->task_execute_queue
) != 0)
5961 transport_remove_task_from_execute_queue(task
, dev
);
5963 __transport_stop_task_timer(task
, &flags
);
5965 if (!(atomic_dec_and_test(&T_TASK(cmd
)->t_task_cdbs_ex_left
))) {
5966 spin_unlock_irqrestore(
5967 &T_TASK(cmd
)->t_state_lock
, flags
);
5969 DEBUG_DO("Skipping task: %p, dev: %p for"
5970 " t_task_cdbs_ex_left: %d\n", task
, dev
,
5971 atomic_read(&T_TASK(cmd
)->t_task_cdbs_ex_left
));
5973 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5977 if (atomic_read(&T_TASK(cmd
)->t_transport_active
)) {
5978 DEBUG_DO("got t_transport_active = 1 for task: %p, dev:"
5979 " %p\n", task
, dev
);
5981 if (atomic_read(&T_TASK(cmd
)->t_fe_count
)) {
5982 spin_unlock_irqrestore(
5983 &T_TASK(cmd
)->t_state_lock
, flags
);
5984 transport_send_check_condition_and_sense(
5985 cmd
, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
,
5987 transport_remove_cmd_from_queue(cmd
,
5988 SE_DEV(cmd
)->dev_queue_obj
);
5990 transport_lun_remove_cmd(cmd
);
5991 transport_cmd_check_stop(cmd
, 1, 0);
5993 spin_unlock_irqrestore(
5994 &T_TASK(cmd
)->t_state_lock
, flags
);
5996 transport_remove_cmd_from_queue(cmd
,
5997 SE_DEV(cmd
)->dev_queue_obj
);
5999 transport_lun_remove_cmd(cmd
);
6001 if (transport_cmd_check_stop(cmd
, 1, 0))
6002 transport_generic_remove(cmd
, 0, 0);
6005 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
6008 DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n",
6011 if (atomic_read(&T_TASK(cmd
)->t_fe_count
)) {
6012 spin_unlock_irqrestore(
6013 &T_TASK(cmd
)->t_state_lock
, flags
);
6014 transport_send_check_condition_and_sense(cmd
,
6015 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
6016 transport_remove_cmd_from_queue(cmd
,
6017 SE_DEV(cmd
)->dev_queue_obj
);
6019 transport_lun_remove_cmd(cmd
);
6020 transport_cmd_check_stop(cmd
, 1, 0);
6022 spin_unlock_irqrestore(
6023 &T_TASK(cmd
)->t_state_lock
, flags
);
6025 transport_remove_cmd_from_queue(cmd
,
6026 SE_DEV(cmd
)->dev_queue_obj
);
6027 transport_lun_remove_cmd(cmd
);
6029 if (transport_cmd_check_stop(cmd
, 1, 0))
6030 transport_generic_remove(cmd
, 0, 0);
6033 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
6035 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
6037 * Empty the struct se_device's struct se_cmd list.
6039 spin_lock_irqsave(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
6040 while ((qr
= __transport_get_qr_from_queue(dev
->dev_queue_obj
))) {
6041 spin_unlock_irqrestore(
6042 &dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
6043 cmd
= (struct se_cmd
*)qr
->cmd
;
6047 DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n",
6050 if (atomic_read(&T_TASK(cmd
)->t_fe_count
)) {
6051 transport_send_check_condition_and_sense(cmd
,
6052 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
6054 transport_lun_remove_cmd(cmd
);
6055 transport_cmd_check_stop(cmd
, 1, 0);
6057 transport_lun_remove_cmd(cmd
);
6058 if (transport_cmd_check_stop(cmd
, 1, 0))
6059 transport_generic_remove(cmd
, 0, 0);
6061 spin_lock_irqsave(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
6063 spin_unlock_irqrestore(&dev
->dev_queue_obj
->cmd_queue_lock
, flags
);
6066 /* transport_processing_thread():
6070 static int transport_processing_thread(void *param
)
6074 struct se_device
*dev
= (struct se_device
*) param
;
6075 struct se_queue_req
*qr
;
6077 set_user_nice(current
, -20);
6079 while (!kthread_should_stop()) {
6080 ret
= wait_event_interruptible(dev
->dev_queue_obj
->thread_wq
,
6081 atomic_read(&dev
->dev_queue_obj
->queue_cnt
) ||
6082 kthread_should_stop());
6086 spin_lock_irq(&dev
->dev_status_lock
);
6087 if (dev
->dev_status
& TRANSPORT_DEVICE_SHUTDOWN
) {
6088 spin_unlock_irq(&dev
->dev_status_lock
);
6089 transport_processing_shutdown(dev
);
6092 spin_unlock_irq(&dev
->dev_status_lock
);
6095 __transport_execute_tasks(dev
);
6097 qr
= transport_get_qr_from_queue(dev
->dev_queue_obj
);
6101 cmd
= (struct se_cmd
*)qr
->cmd
;
6102 t_state
= qr
->state
;
6106 case TRANSPORT_NEW_CMD_MAP
:
6107 if (!(CMD_TFO(cmd
)->new_cmd_map
)) {
6108 printk(KERN_ERR
"CMD_TFO(cmd)->new_cmd_map is"
6109 " NULL for TRANSPORT_NEW_CMD_MAP\n");
6112 ret
= CMD_TFO(cmd
)->new_cmd_map(cmd
);
6114 cmd
->transport_error_status
= ret
;
6115 transport_generic_request_failure(cmd
, NULL
,
6116 0, (cmd
->data_direction
!=
6121 case TRANSPORT_NEW_CMD
:
6122 ret
= transport_generic_new_cmd(cmd
);
6124 cmd
->transport_error_status
= ret
;
6125 transport_generic_request_failure(cmd
, NULL
,
6126 0, (cmd
->data_direction
!=
6130 case TRANSPORT_PROCESS_WRITE
:
6131 transport_generic_process_write(cmd
);
6133 case TRANSPORT_COMPLETE_OK
:
6134 transport_stop_all_task_timers(cmd
);
6135 transport_generic_complete_ok(cmd
);
6137 case TRANSPORT_REMOVE
:
6138 transport_generic_remove(cmd
, 1, 0);
6140 case TRANSPORT_PROCESS_TMR
:
6141 transport_generic_do_tmr(cmd
);
6143 case TRANSPORT_COMPLETE_FAILURE
:
6144 transport_generic_request_failure(cmd
, NULL
, 1, 1);
6146 case TRANSPORT_COMPLETE_TIMEOUT
:
6147 transport_stop_all_task_timers(cmd
);
6148 transport_generic_request_timeout(cmd
);
6151 printk(KERN_ERR
"Unknown t_state: %d deferred_t_state:"
6152 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
6153 " %u\n", t_state
, cmd
->deferred_t_state
,
6154 CMD_TFO(cmd
)->get_task_tag(cmd
),
6155 CMD_TFO(cmd
)->get_cmd_state(cmd
),
6156 SE_LUN(cmd
)->unpacked_lun
);
6164 transport_release_all_cmds(dev
);
6165 dev
->process_thread
= NULL
;