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 init_se_global(void)
232 struct se_global *global;
234 global = kzalloc(sizeof(struct se_global), GFP_KERNEL);
236 printk(KERN_ERR "Unable to allocate memory for struct se_global\n");
240 INIT_LIST_HEAD(&global->g_lu_gps_list);
241 INIT_LIST_HEAD(&global->g_se_tpg_list);
242 INIT_LIST_HEAD(&global->g_hba_list);
243 INIT_LIST_HEAD(&global->g_se_dev_list);
244 spin_lock_init(&global->g_device_lock);
245 spin_lock_init(&global->hba_lock);
246 spin_lock_init(&global->se_tpg_lock);
247 spin_lock_init(&global->lu_gps_lock);
248 spin_lock_init(&global->plugin_class_lock);
250 se_cmd_cache = kmem_cache_create("se_cmd_cache",
251 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
252 if (!(se_cmd_cache)) {
253 printk(KERN_ERR "kmem_cache_create for struct se_cmd failed\n");
256 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
257 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
259 if (!(se_tmr_req_cache)) {
260 printk(KERN_ERR "kmem_cache_create() for struct se_tmr_req"
264 se_sess_cache = kmem_cache_create("se_sess_cache",
265 sizeof(struct se_session), __alignof__(struct se_session),
267 if (!(se_sess_cache)) {
268 printk(KERN_ERR "kmem_cache_create() for struct se_session"
272 se_ua_cache = kmem_cache_create("se_ua_cache",
273 sizeof(struct se_ua), __alignof__(struct se_ua),
275 if (!(se_ua_cache)) {
276 printk(KERN_ERR "kmem_cache_create() for struct se_ua failed\n");
279 se_mem_cache = kmem_cache_create("se_mem_cache",
280 sizeof(struct se_mem), __alignof__(struct se_mem), 0, NULL);
281 if (!(se_mem_cache)) {
282 printk(KERN_ERR "kmem_cache_create() for struct se_mem failed\n");
285 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
286 sizeof(struct t10_pr_registration),
287 __alignof__(struct t10_pr_registration), 0, NULL);
288 if (!(t10_pr_reg_cache)) {
289 printk(KERN_ERR "kmem_cache_create() for struct t10_pr_registration"
293 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
294 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
296 if (!(t10_alua_lu_gp_cache)) {
297 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_cache"
301 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
302 sizeof(struct t10_alua_lu_gp_member),
303 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
304 if (!(t10_alua_lu_gp_mem_cache)) {
305 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_mem_"
309 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
310 sizeof(struct t10_alua_tg_pt_gp),
311 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
312 if (!(t10_alua_tg_pt_gp_cache)) {
313 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
317 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
318 "t10_alua_tg_pt_gp_mem_cache",
319 sizeof(struct t10_alua_tg_pt_gp_member),
320 __alignof__(struct t10_alua_tg_pt_gp_member),
322 if (!(t10_alua_tg_pt_gp_mem_cache)) {
323 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
333 kmem_cache_destroy(se_cmd_cache);
334 if (se_tmr_req_cache)
335 kmem_cache_destroy(se_tmr_req_cache);
337 kmem_cache_destroy(se_sess_cache);
339 kmem_cache_destroy(se_ua_cache);
341 kmem_cache_destroy(se_mem_cache);
342 if (t10_pr_reg_cache)
343 kmem_cache_destroy(t10_pr_reg_cache);
344 if (t10_alua_lu_gp_cache)
345 kmem_cache_destroy(t10_alua_lu_gp_cache);
346 if (t10_alua_lu_gp_mem_cache)
347 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
348 if (t10_alua_tg_pt_gp_cache)
349 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
350 if (t10_alua_tg_pt_gp_mem_cache)
351 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
356 void release_se_global(void)
358 struct se_global *global;
364 kmem_cache_destroy(se_cmd_cache);
365 kmem_cache_destroy(se_tmr_req_cache);
366 kmem_cache_destroy(se_sess_cache);
367 kmem_cache_destroy(se_ua_cache);
368 kmem_cache_destroy(se_mem_cache);
369 kmem_cache_destroy(t10_pr_reg_cache);
370 kmem_cache_destroy(t10_alua_lu_gp_cache);
371 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
372 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
373 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
379 /* SCSI statistics table index */
380 static struct scsi_index_table scsi_index_table;
383 * Initialize the index table for allocating unique row indexes to various mib
386 void init_scsi_index_table(void)
388 memset(&scsi_index_table, 0, sizeof(struct scsi_index_table));
389 spin_lock_init(&scsi_index_table.lock);
393 * Allocate a new row index for the entry type specified
395 u32 scsi_get_new_index(scsi_index_t type)
399 if ((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)) {
400 printk(KERN_ERR "Invalid index type %d\n", type);
404 spin_lock(&scsi_index_table.lock);
405 new_index = ++scsi_index_table.scsi_mib_index[type];
407 new_index = ++scsi_index_table.scsi_mib_index[type];
408 spin_unlock(&scsi_index_table.lock);
413 void transport_init_queue_obj(struct se_queue_obj *qobj)
415 atomic_set(&qobj->queue_cnt, 0);
416 INIT_LIST_HEAD(&qobj->qobj_list);
417 init_waitqueue_head(&qobj->thread_wq);
418 spin_lock_init(&qobj->cmd_queue_lock);
420 EXPORT_SYMBOL(transport_init_queue_obj);
422 static int transport_subsystem_reqmods(void)
426 ret = request_module("target_core_iblock");
428 printk(KERN_ERR "Unable to load target_core_iblock\n");
430 ret = request_module("target_core_file");
432 printk(KERN_ERR "Unable to load target_core_file\n");
434 ret = request_module("target_core_pscsi");
436 printk(KERN_ERR "Unable to load target_core_pscsi\n");
438 ret = request_module("target_core_stgt");
440 printk(KERN_ERR "Unable to load target_core_stgt\n");
445 int transport_subsystem_check_init(void)
447 if (se_global->g_sub_api_initialized)
450 * Request the loading of known TCM subsystem plugins..
452 if (transport_subsystem_reqmods() < 0)
455 se_global->g_sub_api_initialized = 1;
459 struct se_session *transport_init_session(void)
461 struct se_session *se_sess;
463 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
465 printk(KERN_ERR "Unable to allocate struct se_session from"
467 return ERR_PTR(-ENOMEM);
469 INIT_LIST_HEAD(&se_sess->sess_list);
470 INIT_LIST_HEAD(&se_sess->sess_acl_list);
474 EXPORT_SYMBOL(transport_init_session);
477 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
479 void __transport_register_session(
480 struct se_portal_group *se_tpg,
481 struct se_node_acl *se_nacl,
482 struct se_session *se_sess,
483 void *fabric_sess_ptr)
485 unsigned char buf[PR_REG_ISID_LEN];
487 se_sess->se_tpg = se_tpg;
488 se_sess->fabric_sess_ptr = fabric_sess_ptr;
490 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
492 * Only set for struct se_session's that will actually be moving I/O.
493 * eg: *NOT* discovery sessions.
497 * If the fabric module supports an ISID based TransportID,
498 * save this value in binary from the fabric I_T Nexus now.
500 if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) {
501 memset(&buf[0], 0, PR_REG_ISID_LEN);
502 TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess,
503 &buf[0], PR_REG_ISID_LEN);
504 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
506 spin_lock_irq(&se_nacl->nacl_sess_lock);
508 * The se_nacl->nacl_sess pointer will be set to the
509 * last active I_T Nexus for each struct se_node_acl.
511 se_nacl->nacl_sess = se_sess;
513 list_add_tail(&se_sess->sess_acl_list,
514 &se_nacl->acl_sess_list);
515 spin_unlock_irq(&se_nacl->nacl_sess_lock);
517 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
519 printk(KERN_INFO "TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
520 TPG_TFO(se_tpg)->get_fabric_name(), se_sess->fabric_sess_ptr);
522 EXPORT_SYMBOL(__transport_register_session);
524 void transport_register_session(
525 struct se_portal_group *se_tpg,
526 struct se_node_acl *se_nacl,
527 struct se_session *se_sess,
528 void *fabric_sess_ptr)
530 spin_lock_bh(&se_tpg->session_lock);
531 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
532 spin_unlock_bh(&se_tpg->session_lock);
534 EXPORT_SYMBOL(transport_register_session);
536 void transport_deregister_session_configfs(struct se_session *se_sess)
538 struct se_node_acl *se_nacl;
541 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
543 se_nacl = se_sess->se_node_acl;
545 spin_lock_irq(&se_nacl->nacl_sess_lock);
546 list_del(&se_sess->sess_acl_list);
548 * If the session list is empty, then clear the pointer.
549 * Otherwise, set the struct se_session pointer from the tail
550 * element of the per struct se_node_acl active session list.
552 if (list_empty(&se_nacl->acl_sess_list))
553 se_nacl->nacl_sess = NULL;
555 se_nacl->nacl_sess = container_of(
556 se_nacl->acl_sess_list.prev,
557 struct se_session, sess_acl_list);
559 spin_unlock_irq(&se_nacl->nacl_sess_lock);
562 EXPORT_SYMBOL(transport_deregister_session_configfs);
564 void transport_free_session(struct se_session *se_sess)
566 kmem_cache_free(se_sess_cache, se_sess);
568 EXPORT_SYMBOL(transport_free_session);
570 void transport_deregister_session(struct se_session *se_sess)
572 struct se_portal_group *se_tpg = se_sess->se_tpg;
573 struct se_node_acl *se_nacl;
576 transport_free_session(se_sess);
580 spin_lock_bh(&se_tpg->session_lock);
581 list_del(&se_sess->sess_list);
582 se_sess->se_tpg = NULL;
583 se_sess->fabric_sess_ptr = NULL;
584 spin_unlock_bh(&se_tpg->session_lock);
587 * Determine if we need to do extra work for this initiator node's
588 * struct se_node_acl if it had been previously dynamically generated.
590 se_nacl = se_sess->se_node_acl;
592 spin_lock_bh(&se_tpg->acl_node_lock);
593 if (se_nacl->dynamic_node_acl) {
594 if (!(TPG_TFO(se_tpg)->tpg_check_demo_mode_cache(
596 list_del(&se_nacl->acl_list);
597 se_tpg->num_node_acls--;
598 spin_unlock_bh(&se_tpg->acl_node_lock);
600 core_tpg_wait_for_nacl_pr_ref(se_nacl);
601 core_free_device_list_for_node(se_nacl, se_tpg);
602 TPG_TFO(se_tpg)->tpg_release_fabric_acl(se_tpg,
604 spin_lock_bh(&se_tpg->acl_node_lock);
607 spin_unlock_bh(&se_tpg->acl_node_lock);
610 transport_free_session(se_sess);
612 printk(KERN_INFO "TARGET_CORE[%s]: Deregistered fabric_sess\n",
613 TPG_TFO(se_tpg)->get_fabric_name());
615 EXPORT_SYMBOL(transport_deregister_session);
618 * Called with T_TASK(cmd)->t_state_lock held.
620 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
622 struct se_device *dev;
623 struct se_task *task;
629 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
634 if (atomic_read(&task->task_active))
637 if (!(atomic_read(&task->task_state_active)))
640 spin_lock_irqsave(&dev->execute_task_lock, flags);
641 list_del(&task->t_state_list);
642 DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n",
643 CMD_TFO(cmd)->tfo_get_task_tag(cmd), dev, task);
644 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
646 atomic_set(&task->task_state_active, 0);
647 atomic_dec(&T_TASK(cmd)->t_task_cdbs_ex_left);
651 /* transport_cmd_check_stop():
653 * 'transport_off = 1' determines if t_transport_active should be cleared.
654 * 'transport_off = 2' determines if task_dev_state should be removed.
656 * A non-zero u8 t_state sets cmd->t_state.
657 * Returns 1 when command is stopped, else 0.
659 static int transport_cmd_check_stop(
666 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
668 * Determine if IOCTL context caller in requesting the stopping of this
669 * command for LUN shutdown purposes.
671 if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) {
672 DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->transport_lun_stop)"
673 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
674 CMD_TFO(cmd)->get_task_tag(cmd));
676 cmd->deferred_t_state = cmd->t_state;
677 cmd->t_state = TRANSPORT_DEFERRED_CMD;
678 atomic_set(&T_TASK(cmd)->t_transport_active, 0);
679 if (transport_off == 2)
680 transport_all_task_dev_remove_state(cmd);
681 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
683 complete(&T_TASK(cmd)->transport_lun_stop_comp);
687 * Determine if frontend context caller is requesting the stopping of
688 * this command for frontend excpections.
690 if (atomic_read(&T_TASK(cmd)->t_transport_stop)) {
691 DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->t_transport_stop) =="
692 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
693 CMD_TFO(cmd)->get_task_tag(cmd));
695 cmd->deferred_t_state = cmd->t_state;
696 cmd->t_state = TRANSPORT_DEFERRED_CMD;
697 if (transport_off == 2)
698 transport_all_task_dev_remove_state(cmd);
701 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
704 if (transport_off == 2)
706 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
708 complete(&T_TASK(cmd)->t_transport_stop_comp);
712 atomic_set(&T_TASK(cmd)->t_transport_active, 0);
713 if (transport_off == 2) {
714 transport_all_task_dev_remove_state(cmd);
716 * Clear struct se_cmd->se_lun before the transport_off == 2
717 * handoff to fabric module.
721 * Some fabric modules like tcm_loop can release
722 * their internally allocated I/O refrence now and
725 if (CMD_TFO(cmd)->check_stop_free != NULL) {
726 spin_unlock_irqrestore(
727 &T_TASK(cmd)->t_state_lock, flags);
729 CMD_TFO(cmd)->check_stop_free(cmd);
733 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
737 cmd->t_state = t_state;
738 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
743 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
745 return transport_cmd_check_stop(cmd, 2, 0);
748 static void transport_lun_remove_cmd(struct se_cmd *cmd)
750 struct se_lun *lun = SE_LUN(cmd);
756 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
757 if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
758 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
761 atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
762 transport_all_task_dev_remove_state(cmd);
763 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
765 transport_free_dev_tasks(cmd);
768 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
769 if (atomic_read(&T_TASK(cmd)->transport_lun_active)) {
770 list_del(&cmd->se_lun_list);
771 atomic_set(&T_TASK(cmd)->transport_lun_active, 0);
773 printk(KERN_INFO "Removed ITT: 0x%08x from LUN LIST[%d]\n"
774 CMD_TFO(cmd)->get_task_tag(cmd), lun->unpacked_lun);
777 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
780 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
782 transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
783 transport_lun_remove_cmd(cmd);
785 if (transport_cmd_check_stop_to_fabric(cmd))
788 transport_generic_remove(cmd, 0, 0);
791 void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
793 transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
795 if (transport_cmd_check_stop_to_fabric(cmd))
798 transport_generic_remove(cmd, 0, 0);
801 static int transport_add_cmd_to_queue(
805 struct se_device *dev = cmd->se_dev;
806 struct se_queue_obj *qobj = dev->dev_queue_obj;
807 struct se_queue_req *qr;
810 qr = kzalloc(sizeof(struct se_queue_req), GFP_ATOMIC);
812 printk(KERN_ERR "Unable to allocate memory for"
813 " struct se_queue_req\n");
816 INIT_LIST_HEAD(&qr->qr_list);
818 qr->cmd = (void *)cmd;
822 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
823 cmd->t_state = t_state;
824 atomic_set(&T_TASK(cmd)->t_transport_active, 1);
825 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
828 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
829 list_add_tail(&qr->qr_list, &qobj->qobj_list);
830 atomic_inc(&T_TASK(cmd)->t_transport_queue_active);
831 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
833 atomic_inc(&qobj->queue_cnt);
834 wake_up_interruptible(&qobj->thread_wq);
839 * Called with struct se_queue_obj->cmd_queue_lock held.
841 static struct se_queue_req *
842 __transport_get_qr_from_queue(struct se_queue_obj *qobj)
845 struct se_queue_req *qr = NULL;
847 if (list_empty(&qobj->qobj_list))
850 list_for_each_entry(qr, &qobj->qobj_list, qr_list)
854 cmd = (struct se_cmd *)qr->cmd;
855 atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
857 list_del(&qr->qr_list);
858 atomic_dec(&qobj->queue_cnt);
863 static struct se_queue_req *
864 transport_get_qr_from_queue(struct se_queue_obj *qobj)
867 struct se_queue_req *qr;
870 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
871 if (list_empty(&qobj->qobj_list)) {
872 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
876 list_for_each_entry(qr, &qobj->qobj_list, qr_list)
880 cmd = (struct se_cmd *)qr->cmd;
881 atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
883 list_del(&qr->qr_list);
884 atomic_dec(&qobj->queue_cnt);
885 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
890 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
891 struct se_queue_obj *qobj)
893 struct se_cmd *q_cmd;
894 struct se_queue_req *qr = NULL, *qr_p = NULL;
897 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
898 if (!(atomic_read(&T_TASK(cmd)->t_transport_queue_active))) {
899 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
903 list_for_each_entry_safe(qr, qr_p, &qobj->qobj_list, qr_list) {
904 q_cmd = (struct se_cmd *)qr->cmd;
908 atomic_dec(&T_TASK(q_cmd)->t_transport_queue_active);
909 atomic_dec(&qobj->queue_cnt);
910 list_del(&qr->qr_list);
913 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
915 if (atomic_read(&T_TASK(cmd)->t_transport_queue_active)) {
916 printk(KERN_ERR "ITT: 0x%08x t_transport_queue_active: %d\n",
917 CMD_TFO(cmd)->get_task_tag(cmd),
918 atomic_read(&T_TASK(cmd)->t_transport_queue_active));
923 * Completion function used by TCM subsystem plugins (such as FILEIO)
924 * for queueing up response from struct se_subsystem_api->do_task()
926 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
928 struct se_task *task = list_entry(T_TASK(cmd)->t_task_list.next,
929 struct se_task, t_list);
932 cmd->scsi_status = SAM_STAT_GOOD;
933 task->task_scsi_status = GOOD;
935 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
936 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
937 TASK_CMD(task)->transport_error_status =
938 PYX_TRANSPORT_ILLEGAL_REQUEST;
941 transport_complete_task(task, good);
943 EXPORT_SYMBOL(transport_complete_sync_cache);
945 /* transport_complete_task():
947 * Called from interrupt and non interrupt context depending
948 * on the transport plugin.
950 void transport_complete_task(struct se_task *task, int success)
952 struct se_cmd *cmd = TASK_CMD(task);
953 struct se_device *dev = task->se_dev;
957 printk(KERN_INFO "task: %p CDB: 0x%02x obj_ptr: %p\n", task,
958 T_TASK(cmd)->t_task_cdb[0], dev);
961 spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);
962 atomic_inc(&dev->depth_left);
963 atomic_inc(&SE_HBA(dev)->left_queue_depth);
964 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
967 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
968 atomic_set(&task->task_active, 0);
971 * See if any sense data exists, if so set the TASK_SENSE flag.
972 * Also check for any other post completion work that needs to be
973 * done by the plugins.
975 if (dev && dev->transport->transport_complete) {
976 if (dev->transport->transport_complete(task) != 0) {
977 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
978 task->task_sense = 1;
984 * See if we are waiting for outstanding struct se_task
985 * to complete for an exception condition
987 if (atomic_read(&task->task_stop)) {
989 * Decrement T_TASK(cmd)->t_se_count if this task had
990 * previously thrown its timeout exception handler.
992 if (atomic_read(&task->task_timeout)) {
993 atomic_dec(&T_TASK(cmd)->t_se_count);
994 atomic_set(&task->task_timeout, 0);
996 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
998 complete(&task->task_stop_comp);
1002 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
1003 * left counter to determine when the struct se_cmd is ready to be queued to
1004 * the processing thread.
1006 if (atomic_read(&task->task_timeout)) {
1007 if (!(atomic_dec_and_test(
1008 &T_TASK(cmd)->t_task_cdbs_timeout_left))) {
1009 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
1013 t_state = TRANSPORT_COMPLETE_TIMEOUT;
1014 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1016 transport_add_cmd_to_queue(cmd, t_state);
1019 atomic_dec(&T_TASK(cmd)->t_task_cdbs_timeout_left);
1022 * Decrement the outstanding t_task_cdbs_left count. The last
1023 * struct se_task from struct se_cmd will complete itself into the
1024 * device queue depending upon int success.
1026 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) {
1028 T_TASK(cmd)->t_tasks_failed = 1;
1030 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1034 if (!success || T_TASK(cmd)->t_tasks_failed) {
1035 t_state = TRANSPORT_COMPLETE_FAILURE;
1036 if (!task->task_error_status) {
1037 task->task_error_status =
1038 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1039 cmd->transport_error_status =
1040 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1043 atomic_set(&T_TASK(cmd)->t_transport_complete, 1);
1044 t_state = TRANSPORT_COMPLETE_OK;
1046 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1048 transport_add_cmd_to_queue(cmd, t_state);
1050 EXPORT_SYMBOL(transport_complete_task);
1053 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
1054 * struct se_task list are ready to be added to the active execution list
1057 * Called with se_dev_t->execute_task_lock called.
1059 static inline int transport_add_task_check_sam_attr(
1060 struct se_task *task,
1061 struct se_task *task_prev,
1062 struct se_device *dev)
1065 * No SAM Task attribute emulation enabled, add to tail of
1068 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
1069 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
1073 * HEAD_OF_QUEUE attribute for received CDB, which means
1074 * the first task that is associated with a struct se_cmd goes to
1075 * head of the struct se_device->execute_task_list, and task_prev
1076 * after that for each subsequent task
1078 if (task->task_se_cmd->sam_task_attr == TASK_ATTR_HOQ) {
1079 list_add(&task->t_execute_list,
1080 (task_prev != NULL) ?
1081 &task_prev->t_execute_list :
1082 &dev->execute_task_list);
1084 DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
1085 " in execution queue\n",
1086 T_TASK(task->task_se_cmd)->t_task_cdb[0]);
1090 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
1091 * transitioned from Dermant -> Active state, and are added to the end
1092 * of the struct se_device->execute_task_list
1094 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
1098 /* __transport_add_task_to_execute_queue():
1100 * Called with se_dev_t->execute_task_lock called.
1102 static void __transport_add_task_to_execute_queue(
1103 struct se_task *task,
1104 struct se_task *task_prev,
1105 struct se_device *dev)
1109 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
1110 atomic_inc(&dev->execute_tasks);
1112 if (atomic_read(&task->task_state_active))
1115 * Determine if this task needs to go to HEAD_OF_QUEUE for the
1116 * state list as well. Running with SAM Task Attribute emulation
1117 * will always return head_of_queue == 0 here
1120 list_add(&task->t_state_list, (task_prev) ?
1121 &task_prev->t_state_list :
1122 &dev->state_task_list);
1124 list_add_tail(&task->t_state_list, &dev->state_task_list);
1126 atomic_set(&task->task_state_active, 1);
1128 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1129 CMD_TFO(task->task_se_cmd)->get_task_tag(task->task_se_cmd),
1133 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
1135 struct se_device *dev;
1136 struct se_task *task;
1137 unsigned long flags;
1139 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
1140 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
1143 if (atomic_read(&task->task_state_active))
1146 spin_lock(&dev->execute_task_lock);
1147 list_add_tail(&task->t_state_list, &dev->state_task_list);
1148 atomic_set(&task->task_state_active, 1);
1150 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1151 CMD_TFO(task->task_se_cmd)->get_task_tag(
1152 task->task_se_cmd), task, dev);
1154 spin_unlock(&dev->execute_task_lock);
1156 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1159 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
1161 struct se_device *dev = SE_DEV(cmd);
1162 struct se_task *task, *task_prev = NULL;
1163 unsigned long flags;
1165 spin_lock_irqsave(&dev->execute_task_lock, flags);
1166 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
1167 if (atomic_read(&task->task_execute_queue))
1170 * __transport_add_task_to_execute_queue() handles the
1171 * SAM Task Attribute emulation if enabled
1173 __transport_add_task_to_execute_queue(task, task_prev, dev);
1174 atomic_set(&task->task_execute_queue, 1);
1177 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
1182 /* transport_get_task_from_execute_queue():
1184 * Called with dev->execute_task_lock held.
1186 static struct se_task *
1187 transport_get_task_from_execute_queue(struct se_device *dev)
1189 struct se_task *task;
1191 if (list_empty(&dev->execute_task_list))
1194 list_for_each_entry(task, &dev->execute_task_list, t_execute_list)
1197 list_del(&task->t_execute_list);
1198 atomic_dec(&dev->execute_tasks);
1203 /* transport_remove_task_from_execute_queue():
1207 void transport_remove_task_from_execute_queue(
1208 struct se_task *task,
1209 struct se_device *dev)
1211 unsigned long flags;
1213 spin_lock_irqsave(&dev->execute_task_lock, flags);
1214 list_del(&task->t_execute_list);
1215 atomic_dec(&dev->execute_tasks);
1216 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
1219 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1221 switch (cmd->data_direction) {
1224 case DMA_FROM_DEVICE:
1228 case DMA_BIDIRECTIONAL:
1237 void transport_dump_dev_state(
1238 struct se_device *dev,
1242 *bl += sprintf(b + *bl, "Status: ");
1243 switch (dev->dev_status) {
1244 case TRANSPORT_DEVICE_ACTIVATED:
1245 *bl += sprintf(b + *bl, "ACTIVATED");
1247 case TRANSPORT_DEVICE_DEACTIVATED:
1248 *bl += sprintf(b + *bl, "DEACTIVATED");
1250 case TRANSPORT_DEVICE_SHUTDOWN:
1251 *bl += sprintf(b + *bl, "SHUTDOWN");
1253 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1254 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1255 *bl += sprintf(b + *bl, "OFFLINE");
1258 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1262 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1263 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1265 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
1266 DEV_ATTRIB(dev)->block_size, DEV_ATTRIB(dev)->max_sectors);
1267 *bl += sprintf(b + *bl, " ");
1270 /* transport_release_all_cmds():
1274 static void transport_release_all_cmds(struct se_device *dev)
1276 struct se_cmd *cmd = NULL;
1277 struct se_queue_req *qr = NULL, *qr_p = NULL;
1278 int bug_out = 0, t_state;
1279 unsigned long flags;
1281 spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
1282 list_for_each_entry_safe(qr, qr_p, &dev->dev_queue_obj->qobj_list,
1285 cmd = (struct se_cmd *)qr->cmd;
1286 t_state = qr->state;
1287 list_del(&qr->qr_list);
1289 spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock,
1292 printk(KERN_ERR "Releasing ITT: 0x%08x, i_state: %u,"
1293 " t_state: %u directly\n",
1294 CMD_TFO(cmd)->get_task_tag(cmd),
1295 CMD_TFO(cmd)->get_cmd_state(cmd), t_state);
1297 transport_release_fe_cmd(cmd);
1300 spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
1302 spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags);
1309 void transport_dump_vpd_proto_id(
1310 struct t10_vpd *vpd,
1311 unsigned char *p_buf,
1314 unsigned char buf[VPD_TMP_BUF_SIZE];
1317 memset(buf, 0, VPD_TMP_BUF_SIZE);
1318 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1320 switch (vpd->protocol_identifier) {
1322 sprintf(buf+len, "Fibre Channel\n");
1325 sprintf(buf+len, "Parallel SCSI\n");
1328 sprintf(buf+len, "SSA\n");
1331 sprintf(buf+len, "IEEE 1394\n");
1334 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1338 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1341 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1344 sprintf(buf+len, "Automation/Drive Interface Transport"
1348 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1351 sprintf(buf+len, "Unknown 0x%02x\n",
1352 vpd->protocol_identifier);
1357 strncpy(p_buf, buf, p_buf_len);
1359 printk(KERN_INFO "%s", buf);
1363 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1366 * Check if the Protocol Identifier Valid (PIV) bit is set..
1368 * from spc3r23.pdf section 7.5.1
1370 if (page_83[1] & 0x80) {
1371 vpd->protocol_identifier = (page_83[0] & 0xf0);
1372 vpd->protocol_identifier_set = 1;
1373 transport_dump_vpd_proto_id(vpd, NULL, 0);
1376 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1378 int transport_dump_vpd_assoc(
1379 struct t10_vpd *vpd,
1380 unsigned char *p_buf,
1383 unsigned char buf[VPD_TMP_BUF_SIZE];
1386 memset(buf, 0, VPD_TMP_BUF_SIZE);
1387 len = sprintf(buf, "T10 VPD Identifier Association: ");
1389 switch (vpd->association) {
1391 sprintf(buf+len, "addressed logical unit\n");
1394 sprintf(buf+len, "target port\n");
1397 sprintf(buf+len, "SCSI target device\n");
1400 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1406 strncpy(p_buf, buf, p_buf_len);
1413 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1416 * The VPD identification association..
1418 * from spc3r23.pdf Section 7.6.3.1 Table 297
1420 vpd->association = (page_83[1] & 0x30);
1421 return transport_dump_vpd_assoc(vpd, NULL, 0);
1423 EXPORT_SYMBOL(transport_set_vpd_assoc);
1425 int transport_dump_vpd_ident_type(
1426 struct t10_vpd *vpd,
1427 unsigned char *p_buf,
1430 unsigned char buf[VPD_TMP_BUF_SIZE];
1433 memset(buf, 0, VPD_TMP_BUF_SIZE);
1434 len = sprintf(buf, "T10 VPD Identifier Type: ");
1436 switch (vpd->device_identifier_type) {
1438 sprintf(buf+len, "Vendor specific\n");
1441 sprintf(buf+len, "T10 Vendor ID based\n");
1444 sprintf(buf+len, "EUI-64 based\n");
1447 sprintf(buf+len, "NAA\n");
1450 sprintf(buf+len, "Relative target port identifier\n");
1453 sprintf(buf+len, "SCSI name string\n");
1456 sprintf(buf+len, "Unsupported: 0x%02x\n",
1457 vpd->device_identifier_type);
1463 strncpy(p_buf, buf, p_buf_len);
1470 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1473 * The VPD identifier type..
1475 * from spc3r23.pdf Section 7.6.3.1 Table 298
1477 vpd->device_identifier_type = (page_83[1] & 0x0f);
1478 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1480 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1482 int transport_dump_vpd_ident(
1483 struct t10_vpd *vpd,
1484 unsigned char *p_buf,
1487 unsigned char buf[VPD_TMP_BUF_SIZE];
1490 memset(buf, 0, VPD_TMP_BUF_SIZE);
1492 switch (vpd->device_identifier_code_set) {
1493 case 0x01: /* Binary */
1494 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1495 &vpd->device_identifier[0]);
1497 case 0x02: /* ASCII */
1498 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1499 &vpd->device_identifier[0]);
1501 case 0x03: /* UTF-8 */
1502 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1503 &vpd->device_identifier[0]);
1506 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1507 " 0x%02x", vpd->device_identifier_code_set);
1513 strncpy(p_buf, buf, p_buf_len);
1521 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1523 static const char hex_str[] = "0123456789abcdef";
1524 int j = 0, i = 4; /* offset to start of the identifer */
1527 * The VPD Code Set (encoding)
1529 * from spc3r23.pdf Section 7.6.3.1 Table 296
1531 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1532 switch (vpd->device_identifier_code_set) {
1533 case 0x01: /* Binary */
1534 vpd->device_identifier[j++] =
1535 hex_str[vpd->device_identifier_type];
1536 while (i < (4 + page_83[3])) {
1537 vpd->device_identifier[j++] =
1538 hex_str[(page_83[i] & 0xf0) >> 4];
1539 vpd->device_identifier[j++] =
1540 hex_str[page_83[i] & 0x0f];
1544 case 0x02: /* ASCII */
1545 case 0x03: /* UTF-8 */
1546 while (i < (4 + page_83[3]))
1547 vpd->device_identifier[j++] = page_83[i++];
1553 return transport_dump_vpd_ident(vpd, NULL, 0);
1555 EXPORT_SYMBOL(transport_set_vpd_ident);
1557 static void core_setup_task_attr_emulation(struct se_device *dev)
1560 * If this device is from Target_Core_Mod/pSCSI, disable the
1561 * SAM Task Attribute emulation.
1563 * This is currently not available in upsream Linux/SCSI Target
1564 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1566 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1567 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1571 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1572 DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1573 " device\n", TRANSPORT(dev)->name,
1574 TRANSPORT(dev)->get_device_rev(dev));
1577 static void scsi_dump_inquiry(struct se_device *dev)
1579 struct t10_wwn *wwn = DEV_T10_WWN(dev);
1582 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1584 printk(" Vendor: ");
1585 for (i = 0; i < 8; i++)
1586 if (wwn->vendor[i] >= 0x20)
1587 printk("%c", wwn->vendor[i]);
1592 for (i = 0; i < 16; i++)
1593 if (wwn->model[i] >= 0x20)
1594 printk("%c", wwn->model[i]);
1598 printk(" Revision: ");
1599 for (i = 0; i < 4; i++)
1600 if (wwn->revision[i] >= 0x20)
1601 printk("%c", wwn->revision[i]);
1607 device_type = TRANSPORT(dev)->get_device_type(dev);
1608 printk(" Type: %s ", scsi_device_type(device_type));
1609 printk(" ANSI SCSI revision: %02x\n",
1610 TRANSPORT(dev)->get_device_rev(dev));
1613 struct se_device *transport_add_device_to_core_hba(
1615 struct se_subsystem_api *transport,
1616 struct se_subsystem_dev *se_dev,
1618 void *transport_dev,
1619 struct se_dev_limits *dev_limits,
1620 const char *inquiry_prod,
1621 const char *inquiry_rev)
1623 int ret = 0, force_pt;
1624 struct se_device *dev;
1626 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1628 printk(KERN_ERR "Unable to allocate memory for se_dev_t\n");
1631 dev->dev_queue_obj = kzalloc(sizeof(struct se_queue_obj), GFP_KERNEL);
1632 if (!(dev->dev_queue_obj)) {
1633 printk(KERN_ERR "Unable to allocate memory for"
1634 " dev->dev_queue_obj\n");
1638 transport_init_queue_obj(dev->dev_queue_obj);
1640 dev->dev_status_queue_obj = kzalloc(sizeof(struct se_queue_obj),
1642 if (!(dev->dev_status_queue_obj)) {
1643 printk(KERN_ERR "Unable to allocate memory for"
1644 " dev->dev_status_queue_obj\n");
1645 kfree(dev->dev_queue_obj);
1649 transport_init_queue_obj(dev->dev_status_queue_obj);
1651 dev->dev_flags = device_flags;
1652 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1653 dev->dev_ptr = (void *) transport_dev;
1655 dev->se_sub_dev = se_dev;
1656 dev->transport = transport;
1657 atomic_set(&dev->active_cmds, 0);
1658 INIT_LIST_HEAD(&dev->dev_list);
1659 INIT_LIST_HEAD(&dev->dev_sep_list);
1660 INIT_LIST_HEAD(&dev->dev_tmr_list);
1661 INIT_LIST_HEAD(&dev->execute_task_list);
1662 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1663 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1664 INIT_LIST_HEAD(&dev->state_task_list);
1665 spin_lock_init(&dev->execute_task_lock);
1666 spin_lock_init(&dev->delayed_cmd_lock);
1667 spin_lock_init(&dev->ordered_cmd_lock);
1668 spin_lock_init(&dev->state_task_lock);
1669 spin_lock_init(&dev->dev_alua_lock);
1670 spin_lock_init(&dev->dev_reservation_lock);
1671 spin_lock_init(&dev->dev_status_lock);
1672 spin_lock_init(&dev->dev_status_thr_lock);
1673 spin_lock_init(&dev->se_port_lock);
1674 spin_lock_init(&dev->se_tmr_lock);
1676 dev->queue_depth = dev_limits->queue_depth;
1677 atomic_set(&dev->depth_left, dev->queue_depth);
1678 atomic_set(&dev->dev_ordered_id, 0);
1680 se_dev_set_default_attribs(dev, dev_limits);
1682 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1683 dev->creation_time = get_jiffies_64();
1684 spin_lock_init(&dev->stats_lock);
1686 spin_lock(&hba->device_lock);
1687 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1689 spin_unlock(&hba->device_lock);
1691 * Setup the SAM Task Attribute emulation for struct se_device
1693 core_setup_task_attr_emulation(dev);
1695 * Force PR and ALUA passthrough emulation with internal object use.
1697 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1699 * Setup the Reservations infrastructure for struct se_device
1701 core_setup_reservations(dev, force_pt);
1703 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1705 if (core_setup_alua(dev, force_pt) < 0)
1709 * Startup the struct se_device processing thread
1711 dev->process_thread = kthread_run(transport_processing_thread, dev,
1712 "LIO_%s", TRANSPORT(dev)->name);
1713 if (IS_ERR(dev->process_thread)) {
1714 printk(KERN_ERR "Unable to create kthread: LIO_%s\n",
1715 TRANSPORT(dev)->name);
1720 * Preload the initial INQUIRY const values if we are doing
1721 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1722 * passthrough because this is being provided by the backend LLD.
1723 * This is required so that transport_get_inquiry() copies these
1724 * originals once back into DEV_T10_WWN(dev) for the virtual device
1727 if (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1728 if (!(inquiry_prod) || !(inquiry_prod)) {
1729 printk(KERN_ERR "All non TCM/pSCSI plugins require"
1730 " INQUIRY consts\n");
1734 strncpy(&DEV_T10_WWN(dev)->vendor[0], "LIO-ORG", 8);
1735 strncpy(&DEV_T10_WWN(dev)->model[0], inquiry_prod, 16);
1736 strncpy(&DEV_T10_WWN(dev)->revision[0], inquiry_rev, 4);
1738 scsi_dump_inquiry(dev);
1743 kthread_stop(dev->process_thread);
1745 spin_lock(&hba->device_lock);
1746 list_del(&dev->dev_list);
1748 spin_unlock(&hba->device_lock);
1750 se_release_vpd_for_dev(dev);
1752 kfree(dev->dev_status_queue_obj);
1753 kfree(dev->dev_queue_obj);
1758 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1760 /* transport_generic_prepare_cdb():
1762 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1763 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1764 * The point of this is since we are mapping iSCSI LUNs to
1765 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1766 * devices and HBAs for a loop.
1768 static inline void transport_generic_prepare_cdb(
1772 case READ_10: /* SBC - RDProtect */
1773 case READ_12: /* SBC - RDProtect */
1774 case READ_16: /* SBC - RDProtect */
1775 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1776 case VERIFY: /* SBC - VRProtect */
1777 case VERIFY_16: /* SBC - VRProtect */
1778 case WRITE_VERIFY: /* SBC - VRProtect */
1779 case WRITE_VERIFY_12: /* SBC - VRProtect */
1782 cdb[1] &= 0x1f; /* clear logical unit number */
1787 static struct se_task *
1788 transport_generic_get_task(struct se_cmd *cmd,
1789 enum dma_data_direction data_direction)
1791 struct se_task *task;
1792 struct se_device *dev = SE_DEV(cmd);
1793 unsigned long flags;
1795 task = dev->transport->alloc_task(cmd);
1797 printk(KERN_ERR "Unable to allocate struct se_task\n");
1801 INIT_LIST_HEAD(&task->t_list);
1802 INIT_LIST_HEAD(&task->t_execute_list);
1803 INIT_LIST_HEAD(&task->t_state_list);
1804 init_completion(&task->task_stop_comp);
1805 task->task_no = T_TASK(cmd)->t_tasks_no++;
1806 task->task_se_cmd = cmd;
1808 task->task_data_direction = data_direction;
1810 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
1811 list_add_tail(&task->t_list, &T_TASK(cmd)->t_task_list);
1812 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1817 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1819 void transport_device_setup_cmd(struct se_cmd *cmd)
1821 cmd->se_dev = SE_LUN(cmd)->lun_se_dev;
1823 EXPORT_SYMBOL(transport_device_setup_cmd);
1826 * Used by fabric modules containing a local struct se_cmd within their
1827 * fabric dependent per I/O descriptor.
1829 void transport_init_se_cmd(
1831 struct target_core_fabric_ops *tfo,
1832 struct se_session *se_sess,
1836 unsigned char *sense_buffer)
1838 INIT_LIST_HEAD(&cmd->se_lun_list);
1839 INIT_LIST_HEAD(&cmd->se_delayed_list);
1840 INIT_LIST_HEAD(&cmd->se_ordered_list);
1842 * Setup t_task pointer to t_task_backstore
1844 cmd->t_task = &cmd->t_task_backstore;
1846 INIT_LIST_HEAD(&T_TASK(cmd)->t_task_list);
1847 init_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp);
1848 init_completion(&T_TASK(cmd)->transport_lun_stop_comp);
1849 init_completion(&T_TASK(cmd)->t_transport_stop_comp);
1850 spin_lock_init(&T_TASK(cmd)->t_state_lock);
1851 atomic_set(&T_TASK(cmd)->transport_dev_active, 1);
1854 cmd->se_sess = se_sess;
1855 cmd->data_length = data_length;
1856 cmd->data_direction = data_direction;
1857 cmd->sam_task_attr = task_attr;
1858 cmd->sense_buffer = sense_buffer;
1860 EXPORT_SYMBOL(transport_init_se_cmd);
1862 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1865 * Check if SAM Task Attribute emulation is enabled for this
1866 * struct se_device storage object
1868 if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1871 if (cmd->sam_task_attr == TASK_ATTR_ACA) {
1872 DEBUG_STA("SAM Task Attribute ACA"
1873 " emulation is not supported\n");
1877 * Used to determine when ORDERED commands should go from
1878 * Dormant to Active status.
1880 cmd->se_ordered_id = atomic_inc_return(&SE_DEV(cmd)->dev_ordered_id);
1881 smp_mb__after_atomic_inc();
1882 DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1883 cmd->se_ordered_id, cmd->sam_task_attr,
1884 TRANSPORT(cmd->se_dev)->name);
1888 void transport_free_se_cmd(
1889 struct se_cmd *se_cmd)
1891 if (se_cmd->se_tmr_req)
1892 core_tmr_release_req(se_cmd->se_tmr_req);
1894 * Check and free any extended CDB buffer that was allocated
1896 if (T_TASK(se_cmd)->t_task_cdb != T_TASK(se_cmd)->__t_task_cdb)
1897 kfree(T_TASK(se_cmd)->t_task_cdb);
1899 EXPORT_SYMBOL(transport_free_se_cmd);
1901 static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1903 /* transport_generic_allocate_tasks():
1905 * Called from fabric RX Thread.
1907 int transport_generic_allocate_tasks(
1913 transport_generic_prepare_cdb(cdb);
1916 * This is needed for early exceptions.
1918 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1920 transport_device_setup_cmd(cmd);
1922 * Ensure that the received CDB is less than the max (252 + 8) bytes
1923 * for VARIABLE_LENGTH_CMD
1925 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1926 printk(KERN_ERR "Received SCSI CDB with command_size: %d that"
1927 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1928 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1932 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1933 * allocate the additional extended CDB buffer now.. Otherwise
1934 * setup the pointer from __t_task_cdb to t_task_cdb.
1936 if (scsi_command_size(cdb) > sizeof(T_TASK(cmd)->__t_task_cdb)) {
1937 T_TASK(cmd)->t_task_cdb = kzalloc(scsi_command_size(cdb),
1939 if (!(T_TASK(cmd)->t_task_cdb)) {
1940 printk(KERN_ERR "Unable to allocate T_TASK(cmd)->t_task_cdb"
1941 " %u > sizeof(T_TASK(cmd)->__t_task_cdb): %lu ops\n",
1942 scsi_command_size(cdb),
1943 (unsigned long)sizeof(T_TASK(cmd)->__t_task_cdb));
1947 T_TASK(cmd)->t_task_cdb = &T_TASK(cmd)->__t_task_cdb[0];
1949 * Copy the original CDB into T_TASK(cmd).
1951 memcpy(T_TASK(cmd)->t_task_cdb, cdb, scsi_command_size(cdb));
1953 * Setup the received CDB based on SCSI defined opcodes and
1954 * perform unit attention, persistent reservations and ALUA
1955 * checks for virtual device backends. The T_TASK(cmd)->t_task_cdb
1956 * pointer is expected to be setup before we reach this point.
1958 ret = transport_generic_cmd_sequencer(cmd, cdb);
1962 * Check for SAM Task Attribute Emulation
1964 if (transport_check_alloc_task_attr(cmd) < 0) {
1965 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1966 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1969 spin_lock(&cmd->se_lun->lun_sep_lock);
1970 if (cmd->se_lun->lun_sep)
1971 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1972 spin_unlock(&cmd->se_lun->lun_sep_lock);
1975 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1978 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1979 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1981 int transport_generic_handle_cdb(
1986 printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
1990 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1993 EXPORT_SYMBOL(transport_generic_handle_cdb);
1996 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1997 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1998 * complete setup in TCM process context w/ TFO->new_cmd_map().
2000 int transport_generic_handle_cdb_map(
2005 printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
2009 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
2012 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
2014 /* transport_generic_handle_data():
2018 int transport_generic_handle_data(
2022 * For the software fabric case, then we assume the nexus is being
2023 * failed/shutdown when signals are pending from the kthread context
2024 * caller, so we return a failure. For the HW target mode case running
2025 * in interrupt code, the signal_pending() check is skipped.
2027 if (!in_interrupt() && signal_pending(current))
2030 * If the received CDB has aleady been ABORTED by the generic
2031 * target engine, we now call transport_check_aborted_status()
2032 * to queue any delated TASK_ABORTED status for the received CDB to the
2033 * fabric module as we are expecting no futher incoming DATA OUT
2034 * sequences at this point.
2036 if (transport_check_aborted_status(cmd, 1) != 0)
2039 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
2042 EXPORT_SYMBOL(transport_generic_handle_data);
2044 /* transport_generic_handle_tmr():
2048 int transport_generic_handle_tmr(
2052 * This is needed for early exceptions.
2054 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
2055 transport_device_setup_cmd(cmd);
2057 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
2060 EXPORT_SYMBOL(transport_generic_handle_tmr);
2062 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
2064 struct se_task *task, *task_tmp;
2065 unsigned long flags;
2068 DEBUG_TS("ITT[0x%08x] - Stopping tasks\n",
2069 CMD_TFO(cmd)->get_task_tag(cmd));
2072 * No tasks remain in the execution queue
2074 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2075 list_for_each_entry_safe(task, task_tmp,
2076 &T_TASK(cmd)->t_task_list, t_list) {
2077 DEBUG_TS("task_no[%d] - Processing task %p\n",
2078 task->task_no, task);
2080 * If the struct se_task has not been sent and is not active,
2081 * remove the struct se_task from the execution queue.
2083 if (!atomic_read(&task->task_sent) &&
2084 !atomic_read(&task->task_active)) {
2085 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
2087 transport_remove_task_from_execute_queue(task,
2090 DEBUG_TS("task_no[%d] - Removed from execute queue\n",
2092 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2097 * If the struct se_task is active, sleep until it is returned
2100 if (atomic_read(&task->task_active)) {
2101 atomic_set(&task->task_stop, 1);
2102 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
2105 DEBUG_TS("task_no[%d] - Waiting to complete\n",
2107 wait_for_completion(&task->task_stop_comp);
2108 DEBUG_TS("task_no[%d] - Stopped successfully\n",
2111 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2112 atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
2114 atomic_set(&task->task_active, 0);
2115 atomic_set(&task->task_stop, 0);
2117 DEBUG_TS("task_no[%d] - Did nothing\n", task->task_no);
2121 __transport_stop_task_timer(task, &flags);
2123 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2128 static void transport_failure_reset_queue_depth(struct se_device *dev)
2130 unsigned long flags;
2132 spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);;
2133 atomic_inc(&dev->depth_left);
2134 atomic_inc(&SE_HBA(dev)->left_queue_depth);
2135 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
2139 * Handle SAM-esque emulation for generic transport request failures.
2141 static void transport_generic_request_failure(
2143 struct se_device *dev,
2147 DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
2148 " CDB: 0x%02x\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd),
2149 T_TASK(cmd)->t_task_cdb[0]);
2150 DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:"
2151 " %d/%d transport_error_status: %d\n",
2152 CMD_TFO(cmd)->get_cmd_state(cmd),
2153 cmd->t_state, cmd->deferred_t_state,
2154 cmd->transport_error_status);
2155 DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d"
2156 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
2157 " t_transport_active: %d t_transport_stop: %d"
2158 " t_transport_sent: %d\n", T_TASK(cmd)->t_task_cdbs,
2159 atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
2160 atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
2161 atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left),
2162 atomic_read(&T_TASK(cmd)->t_transport_active),
2163 atomic_read(&T_TASK(cmd)->t_transport_stop),
2164 atomic_read(&T_TASK(cmd)->t_transport_sent));
2166 transport_stop_all_task_timers(cmd);
2169 transport_failure_reset_queue_depth(dev);
2171 * For SAM Task Attribute emulation for failed struct se_cmd
2173 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2174 transport_complete_task_attr(cmd);
2177 transport_direct_request_timeout(cmd);
2178 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2181 switch (cmd->transport_error_status) {
2182 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
2183 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2185 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
2186 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
2188 case PYX_TRANSPORT_INVALID_CDB_FIELD:
2189 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2191 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
2192 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2194 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
2196 transport_new_cmd_failure(cmd);
2198 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2199 * we force this session to fall back to session
2202 CMD_TFO(cmd)->fall_back_to_erl0(cmd->se_sess);
2203 CMD_TFO(cmd)->stop_session(cmd->se_sess, 0, 0);
2206 case PYX_TRANSPORT_LU_COMM_FAILURE:
2207 case PYX_TRANSPORT_ILLEGAL_REQUEST:
2208 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2210 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
2211 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
2213 case PYX_TRANSPORT_WRITE_PROTECTED:
2214 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
2216 case PYX_TRANSPORT_RESERVATION_CONFLICT:
2218 * No SENSE Data payload for this case, set SCSI Status
2219 * and queue the response to $FABRIC_MOD.
2221 * Uses linux/include/scsi/scsi.h SAM status codes defs
2223 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2225 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2226 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2229 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2232 DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2)
2233 core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl,
2234 cmd->orig_fe_lun, 0x2C,
2235 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2237 CMD_TFO(cmd)->queue_status(cmd);
2239 case PYX_TRANSPORT_USE_SENSE_REASON:
2241 * struct se_cmd->scsi_sense_reason already set
2245 printk(KERN_ERR "Unknown transport error for CDB 0x%02x: %d\n",
2246 T_TASK(cmd)->t_task_cdb[0],
2247 cmd->transport_error_status);
2248 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2253 transport_new_cmd_failure(cmd);
2255 transport_send_check_condition_and_sense(cmd,
2256 cmd->scsi_sense_reason, 0);
2258 transport_lun_remove_cmd(cmd);
2259 if (!(transport_cmd_check_stop_to_fabric(cmd)))
2263 static void transport_direct_request_timeout(struct se_cmd *cmd)
2265 unsigned long flags;
2267 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2268 if (!(atomic_read(&T_TASK(cmd)->t_transport_timeout))) {
2269 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2272 if (atomic_read(&T_TASK(cmd)->t_task_cdbs_timeout_left)) {
2273 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2277 atomic_sub(atomic_read(&T_TASK(cmd)->t_transport_timeout),
2278 &T_TASK(cmd)->t_se_count);
2279 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2282 static void transport_generic_request_timeout(struct se_cmd *cmd)
2284 unsigned long flags;
2287 * Reset T_TASK(cmd)->t_se_count to allow transport_generic_remove()
2288 * to allow last call to free memory resources.
2290 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2291 if (atomic_read(&T_TASK(cmd)->t_transport_timeout) > 1) {
2292 int tmp = (atomic_read(&T_TASK(cmd)->t_transport_timeout) - 1);
2294 atomic_sub(tmp, &T_TASK(cmd)->t_se_count);
2296 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2298 transport_generic_remove(cmd, 0, 0);
2302 transport_generic_allocate_buf(struct se_cmd *cmd, u32 data_length)
2306 buf = kzalloc(data_length, GFP_KERNEL);
2308 printk(KERN_ERR "Unable to allocate memory for buffer\n");
2312 T_TASK(cmd)->t_tasks_se_num = 0;
2313 T_TASK(cmd)->t_task_buf = buf;
2318 static inline u32 transport_lba_21(unsigned char *cdb)
2320 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2323 static inline u32 transport_lba_32(unsigned char *cdb)
2325 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2328 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2330 unsigned int __v1, __v2;
2332 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2333 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2335 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2339 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2341 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2343 unsigned int __v1, __v2;
2345 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2346 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2348 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2351 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2353 unsigned long flags;
2355 spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags);
2356 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2357 spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags);
2361 * Called from interrupt context.
2363 static void transport_task_timeout_handler(unsigned long data)
2365 struct se_task *task = (struct se_task *)data;
2366 struct se_cmd *cmd = TASK_CMD(task);
2367 unsigned long flags;
2369 DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2371 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2372 if (task->task_flags & TF_STOP) {
2373 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2376 task->task_flags &= ~TF_RUNNING;
2379 * Determine if transport_complete_task() has already been called.
2381 if (!(atomic_read(&task->task_active))) {
2382 DEBUG_TT("transport task: %p cmd: %p timeout task_active"
2383 " == 0\n", task, cmd);
2384 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2388 atomic_inc(&T_TASK(cmd)->t_se_count);
2389 atomic_inc(&T_TASK(cmd)->t_transport_timeout);
2390 T_TASK(cmd)->t_tasks_failed = 1;
2392 atomic_set(&task->task_timeout, 1);
2393 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2394 task->task_scsi_status = 1;
2396 if (atomic_read(&task->task_stop)) {
2397 DEBUG_TT("transport task: %p cmd: %p timeout task_stop"
2398 " == 1\n", task, cmd);
2399 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2400 complete(&task->task_stop_comp);
2404 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) {
2405 DEBUG_TT("transport task: %p cmd: %p timeout non zero"
2406 " t_task_cdbs_left\n", task, cmd);
2407 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2410 DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2413 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
2414 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2416 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2420 * Called with T_TASK(cmd)->t_state_lock held.
2422 static void transport_start_task_timer(struct se_task *task)
2424 struct se_device *dev = task->se_dev;
2427 if (task->task_flags & TF_RUNNING)
2430 * If the task_timeout is disabled, exit now.
2432 timeout = DEV_ATTRIB(dev)->task_timeout;
2436 init_timer(&task->task_timer);
2437 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2438 task->task_timer.data = (unsigned long) task;
2439 task->task_timer.function = transport_task_timeout_handler;
2441 task->task_flags |= TF_RUNNING;
2442 add_timer(&task->task_timer);
2444 printk(KERN_INFO "Starting task timer for cmd: %p task: %p seconds:"
2445 " %d\n", task->task_se_cmd, task, timeout);
2450 * Called with spin_lock_irq(&T_TASK(cmd)->t_state_lock) held.
2452 void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2454 struct se_cmd *cmd = TASK_CMD(task);
2456 if (!(task->task_flags & TF_RUNNING))
2459 task->task_flags |= TF_STOP;
2460 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, *flags);
2462 del_timer_sync(&task->task_timer);
2464 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, *flags);
2465 task->task_flags &= ~TF_RUNNING;
2466 task->task_flags &= ~TF_STOP;
2469 static void transport_stop_all_task_timers(struct se_cmd *cmd)
2471 struct se_task *task = NULL, *task_tmp;
2472 unsigned long flags;
2474 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2475 list_for_each_entry_safe(task, task_tmp,
2476 &T_TASK(cmd)->t_task_list, t_list)
2477 __transport_stop_task_timer(task, &flags);
2478 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2481 static inline int transport_tcq_window_closed(struct se_device *dev)
2483 if (dev->dev_tcq_window_closed++ <
2484 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2485 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2487 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2489 wake_up_interruptible(&dev->dev_queue_obj->thread_wq);
2494 * Called from Fabric Module context from transport_execute_tasks()
2496 * The return of this function determins if the tasks from struct se_cmd
2497 * get added to the execution queue in transport_execute_tasks(),
2498 * or are added to the delayed or ordered lists here.
2500 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2502 if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2505 * Check for the existance of HEAD_OF_QUEUE, and if true return 1
2506 * to allow the passed struct se_cmd list of tasks to the front of the list.
2508 if (cmd->sam_task_attr == TASK_ATTR_HOQ) {
2509 atomic_inc(&SE_DEV(cmd)->dev_hoq_count);
2510 smp_mb__after_atomic_inc();
2511 DEBUG_STA("Added HEAD_OF_QUEUE for CDB:"
2512 " 0x%02x, se_ordered_id: %u\n",
2513 T_TASK(cmd)->t_task_cdb[0],
2514 cmd->se_ordered_id);
2516 } else if (cmd->sam_task_attr == TASK_ATTR_ORDERED) {
2517 spin_lock(&SE_DEV(cmd)->ordered_cmd_lock);
2518 list_add_tail(&cmd->se_ordered_list,
2519 &SE_DEV(cmd)->ordered_cmd_list);
2520 spin_unlock(&SE_DEV(cmd)->ordered_cmd_lock);
2522 atomic_inc(&SE_DEV(cmd)->dev_ordered_sync);
2523 smp_mb__after_atomic_inc();
2525 DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered"
2526 " list, se_ordered_id: %u\n",
2527 T_TASK(cmd)->t_task_cdb[0],
2528 cmd->se_ordered_id);
2530 * Add ORDERED command to tail of execution queue if
2531 * no other older commands exist that need to be
2534 if (!(atomic_read(&SE_DEV(cmd)->simple_cmds)))
2538 * For SIMPLE and UNTAGGED Task Attribute commands
2540 atomic_inc(&SE_DEV(cmd)->simple_cmds);
2541 smp_mb__after_atomic_inc();
2544 * Otherwise if one or more outstanding ORDERED task attribute exist,
2545 * add the dormant task(s) built for the passed struct se_cmd to the
2546 * execution queue and become in Active state for this struct se_device.
2548 if (atomic_read(&SE_DEV(cmd)->dev_ordered_sync) != 0) {
2550 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2551 * will be drained upon competion of HEAD_OF_QUEUE task.
2553 spin_lock(&SE_DEV(cmd)->delayed_cmd_lock);
2554 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2555 list_add_tail(&cmd->se_delayed_list,
2556 &SE_DEV(cmd)->delayed_cmd_list);
2557 spin_unlock(&SE_DEV(cmd)->delayed_cmd_lock);
2559 DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to"
2560 " delayed CMD list, se_ordered_id: %u\n",
2561 T_TASK(cmd)->t_task_cdb[0], cmd->sam_task_attr,
2562 cmd->se_ordered_id);
2564 * Return zero to let transport_execute_tasks() know
2565 * not to add the delayed tasks to the execution list.
2570 * Otherwise, no ORDERED task attributes exist..
2576 * Called from fabric module context in transport_generic_new_cmd() and
2577 * transport_generic_process_write()
2579 static int transport_execute_tasks(struct se_cmd *cmd)
2583 if (!(cmd->se_cmd_flags & SCF_SE_DISABLE_ONLINE_CHECK)) {
2584 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2585 cmd->transport_error_status =
2586 PYX_TRANSPORT_LU_COMM_FAILURE;
2587 transport_generic_request_failure(cmd, NULL, 0, 1);
2592 * Call transport_cmd_check_stop() to see if a fabric exception
2593 * has occured that prevents execution.
2595 if (!(transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))) {
2597 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2598 * attribute for the tasks of the received struct se_cmd CDB
2600 add_tasks = transport_execute_task_attr(cmd);
2604 * This calls transport_add_tasks_from_cmd() to handle
2605 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2606 * (if enabled) in __transport_add_task_to_execute_queue() and
2607 * transport_add_task_check_sam_attr().
2609 transport_add_tasks_from_cmd(cmd);
2612 * Kick the execution queue for the cmd associated struct se_device
2616 __transport_execute_tasks(SE_DEV(cmd));
2621 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2622 * from struct se_device->execute_task_list and
2624 * Called from transport_processing_thread()
2626 static int __transport_execute_tasks(struct se_device *dev)
2629 struct se_cmd *cmd = NULL;
2630 struct se_task *task;
2631 unsigned long flags;
2634 * Check if there is enough room in the device and HBA queue to send
2635 * struct se_transport_task's to the selected transport.
2638 spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);
2639 if (!(atomic_read(&dev->depth_left)) ||
2640 !(atomic_read(&SE_HBA(dev)->left_queue_depth))) {
2641 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
2642 return transport_tcq_window_closed(dev);
2644 dev->dev_tcq_window_closed = 0;
2646 spin_lock(&dev->execute_task_lock);
2647 task = transport_get_task_from_execute_queue(dev);
2648 spin_unlock(&dev->execute_task_lock);
2651 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
2655 atomic_dec(&dev->depth_left);
2656 atomic_dec(&SE_HBA(dev)->left_queue_depth);
2657 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
2659 cmd = TASK_CMD(task);
2661 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2662 atomic_set(&task->task_active, 1);
2663 atomic_set(&task->task_sent, 1);
2664 atomic_inc(&T_TASK(cmd)->t_task_cdbs_sent);
2666 if (atomic_read(&T_TASK(cmd)->t_task_cdbs_sent) ==
2667 T_TASK(cmd)->t_task_cdbs)
2668 atomic_set(&cmd->transport_sent, 1);
2670 transport_start_task_timer(task);
2671 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2673 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2674 * to grab REPORT_LUNS CDBs before they hit the
2675 * struct se_subsystem_api->do_task() caller below.
2677 if (cmd->transport_emulate_cdb) {
2678 error = cmd->transport_emulate_cdb(cmd);
2680 cmd->transport_error_status = error;
2681 atomic_set(&task->task_active, 0);
2682 atomic_set(&cmd->transport_sent, 0);
2683 transport_stop_tasks_for_cmd(cmd);
2684 transport_generic_request_failure(cmd, dev, 0, 1);
2688 * Handle the successful completion for transport_emulate_cdb()
2689 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2690 * Otherwise the caller is expected to complete the task with
2693 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2694 cmd->scsi_status = SAM_STAT_GOOD;
2695 task->task_scsi_status = GOOD;
2696 transport_complete_task(task, 1);
2700 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2701 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2702 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2703 * LUN emulation code.
2705 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2706 * call ->do_task() directly and let the underlying TCM subsystem plugin
2707 * code handle the CDB emulation.
2709 if ((TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2710 (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2711 error = transport_emulate_control_cdb(task);
2713 error = TRANSPORT(dev)->do_task(task);
2716 cmd->transport_error_status = error;
2717 atomic_set(&task->task_active, 0);
2718 atomic_set(&cmd->transport_sent, 0);
2719 transport_stop_tasks_for_cmd(cmd);
2720 transport_generic_request_failure(cmd, dev, 0, 1);
2729 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2731 unsigned long flags;
2733 * Any unsolicited data will get dumped for failed command inside of
2736 spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags);
2737 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2738 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2739 spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags);
2741 CMD_TFO(se_cmd)->new_cmd_failure(se_cmd);
2744 static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2746 static inline u32 transport_get_sectors_6(
2751 struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
2754 * Assume TYPE_DISK for non struct se_device objects.
2755 * Use 8-bit sector value.
2761 * Use 24-bit allocation length for TYPE_TAPE.
2763 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE)
2764 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2767 * Everything else assume TYPE_DISK Sector CDB location.
2768 * Use 8-bit sector value.
2774 static inline u32 transport_get_sectors_10(
2779 struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
2782 * Assume TYPE_DISK for non struct se_device objects.
2783 * Use 16-bit sector value.
2789 * XXX_10 is not defined in SSC, throw an exception
2791 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
2797 * Everything else assume TYPE_DISK Sector CDB location.
2798 * Use 16-bit sector value.
2801 return (u32)(cdb[7] << 8) + cdb[8];
2804 static inline u32 transport_get_sectors_12(
2809 struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
2812 * Assume TYPE_DISK for non struct se_device objects.
2813 * Use 32-bit sector value.
2819 * XXX_12 is not defined in SSC, throw an exception
2821 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
2827 * Everything else assume TYPE_DISK Sector CDB location.
2828 * Use 32-bit sector value.
2831 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2834 static inline u32 transport_get_sectors_16(
2839 struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
2842 * Assume TYPE_DISK for non struct se_device objects.
2843 * Use 32-bit sector value.
2849 * Use 24-bit allocation length for TYPE_TAPE.
2851 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE)
2852 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2855 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2856 (cdb[12] << 8) + cdb[13];
2860 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2862 static inline u32 transport_get_sectors_32(
2868 * Assume TYPE_DISK for non struct se_device objects.
2869 * Use 32-bit sector value.
2871 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2872 (cdb[30] << 8) + cdb[31];
2876 static inline u32 transport_get_size(
2881 struct se_device *dev = SE_DEV(cmd);
2883 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
2884 if (cdb[1] & 1) { /* sectors */
2885 return DEV_ATTRIB(dev)->block_size * sectors;
2890 printk(KERN_INFO "Returning block_size: %u, sectors: %u == %u for"
2891 " %s object\n", DEV_ATTRIB(dev)->block_size, sectors,
2892 DEV_ATTRIB(dev)->block_size * sectors,
2893 TRANSPORT(dev)->name);
2895 return DEV_ATTRIB(dev)->block_size * sectors;
2898 unsigned char transport_asciihex_to_binaryhex(unsigned char val[2])
2900 unsigned char result = 0;
2904 if ((val[0] >= 'a') && (val[0] <= 'f'))
2905 result = ((val[0] - 'a' + 10) & 0xf) << 4;
2907 if ((val[0] >= 'A') && (val[0] <= 'F'))
2908 result = ((val[0] - 'A' + 10) & 0xf) << 4;
2910 result = ((val[0] - '0') & 0xf) << 4;
2914 if ((val[1] >= 'a') && (val[1] <= 'f'))
2915 result |= ((val[1] - 'a' + 10) & 0xf);
2917 if ((val[1] >= 'A') && (val[1] <= 'F'))
2918 result |= ((val[1] - 'A' + 10) & 0xf);
2920 result |= ((val[1] - '0') & 0xf);
2924 EXPORT_SYMBOL(transport_asciihex_to_binaryhex);
2926 static void transport_xor_callback(struct se_cmd *cmd)
2928 unsigned char *buf, *addr;
2929 struct se_mem *se_mem;
2930 unsigned int offset;
2933 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2935 * 1) read the specified logical block(s);
2936 * 2) transfer logical blocks from the data-out buffer;
2937 * 3) XOR the logical blocks transferred from the data-out buffer with
2938 * the logical blocks read, storing the resulting XOR data in a buffer;
2939 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2940 * blocks transferred from the data-out buffer; and
2941 * 5) transfer the resulting XOR data to the data-in buffer.
2943 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2945 printk(KERN_ERR "Unable to allocate xor_callback buf\n");
2949 * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list
2950 * into the locally allocated *buf
2952 transport_memcpy_se_mem_read_contig(cmd, buf, T_TASK(cmd)->t_mem_list);
2954 * Now perform the XOR against the BIDI read memory located at
2955 * T_TASK(cmd)->t_mem_bidi_list
2959 list_for_each_entry(se_mem, T_TASK(cmd)->t_mem_bidi_list, se_list) {
2960 addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0);
2964 for (i = 0; i < se_mem->se_len; i++)
2965 *(addr + se_mem->se_off + i) ^= *(buf + offset + i);
2967 offset += se_mem->se_len;
2968 kunmap_atomic(addr, KM_USER0);
2975 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2977 static int transport_get_sense_data(struct se_cmd *cmd)
2979 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2980 struct se_device *dev;
2981 struct se_task *task = NULL, *task_tmp;
2982 unsigned long flags;
2986 printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
2989 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2990 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2991 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2995 list_for_each_entry_safe(task, task_tmp,
2996 &T_TASK(cmd)->t_task_list, t_list) {
2998 if (!task->task_sense)
3005 if (!TRANSPORT(dev)->get_sense_buffer) {
3006 printk(KERN_ERR "TRANSPORT(dev)->get_sense_buffer"
3011 sense_buffer = TRANSPORT(dev)->get_sense_buffer(task);
3012 if (!(sense_buffer)) {
3013 printk(KERN_ERR "ITT[0x%08x]_TASK[%d]: Unable to locate"
3014 " sense buffer for task with sense\n",
3015 CMD_TFO(cmd)->get_task_tag(cmd), task->task_no);
3018 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
3020 offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd,
3021 TRANSPORT_SENSE_BUFFER);
3023 memcpy((void *)&buffer[offset], (void *)sense_buffer,
3024 TRANSPORT_SENSE_BUFFER);
3025 cmd->scsi_status = task->task_scsi_status;
3026 /* Automatically padded */
3027 cmd->scsi_sense_length =
3028 (TRANSPORT_SENSE_BUFFER + offset);
3030 printk(KERN_INFO "HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
3032 dev->se_hba->hba_id, TRANSPORT(dev)->name,
3036 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
3041 static int transport_allocate_resources(struct se_cmd *cmd)
3043 u32 length = cmd->data_length;
3045 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3046 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB))
3047 return transport_generic_get_mem(cmd, length, PAGE_SIZE);
3048 else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB)
3049 return transport_generic_allocate_buf(cmd, length);
3055 transport_handle_reservation_conflict(struct se_cmd *cmd)
3057 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3058 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3059 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
3060 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
3062 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
3063 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
3066 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
3069 DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2)
3070 core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl,
3071 cmd->orig_fe_lun, 0x2C,
3072 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
3076 /* transport_generic_cmd_sequencer():
3078 * Generic Command Sequencer that should work for most DAS transport
3081 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
3084 * FIXME: Need to support other SCSI OPCODES where as well.
3086 static int transport_generic_cmd_sequencer(
3090 struct se_device *dev = SE_DEV(cmd);
3091 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
3092 int ret = 0, sector_ret = 0, passthrough;
3093 u32 sectors = 0, size = 0, pr_reg_type = 0;
3097 * Check for an existing UNIT ATTENTION condition
3099 if (core_scsi3_ua_check(cmd, cdb) < 0) {
3100 cmd->transport_wait_for_tasks =
3101 &transport_nop_wait_for_tasks;
3102 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3103 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
3107 * Check status of Asymmetric Logical Unit Assignment port
3109 ret = T10_ALUA(su_dev)->alua_state_check(cmd, cdb, &alua_ascq);
3111 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3113 * Set SCSI additional sense code (ASC) to 'LUN Not Accessable';
3114 * The ALUA additional sense code qualifier (ASCQ) is determined
3115 * by the ALUA primary or secondary access state..
3119 printk(KERN_INFO "[%s]: ALUA TG Port not available,"
3120 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
3121 CMD_TFO(cmd)->get_fabric_name(), alua_ascq);
3123 transport_set_sense_codes(cmd, 0x04, alua_ascq);
3124 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3125 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
3128 goto out_invalid_cdb_field;
3131 * Check status for SPC-3 Persistent Reservations
3133 if (T10_PR_OPS(su_dev)->t10_reservation_check(cmd, &pr_reg_type) != 0) {
3134 if (T10_PR_OPS(su_dev)->t10_seq_non_holder(
3135 cmd, cdb, pr_reg_type) != 0)
3136 return transport_handle_reservation_conflict(cmd);
3138 * This means the CDB is allowed for the SCSI Initiator port
3139 * when said port is *NOT* holding the legacy SPC-2 or
3140 * SPC-3 Persistent Reservation.
3146 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
3148 goto out_unsupported_cdb;
3149 size = transport_get_size(sectors, cdb, cmd);
3150 cmd->transport_split_cdb = &split_cdb_XX_6;
3151 T_TASK(cmd)->t_task_lba = transport_lba_21(cdb);
3152 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3155 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3157 goto out_unsupported_cdb;
3158 size = transport_get_size(sectors, cdb, cmd);
3159 cmd->transport_split_cdb = &split_cdb_XX_10;
3160 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3161 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3164 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
3166 goto out_unsupported_cdb;
3167 size = transport_get_size(sectors, cdb, cmd);
3168 cmd->transport_split_cdb = &split_cdb_XX_12;
3169 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3170 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3173 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3175 goto out_unsupported_cdb;
3176 size = transport_get_size(sectors, cdb, cmd);
3177 cmd->transport_split_cdb = &split_cdb_XX_16;
3178 T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
3179 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3182 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
3184 goto out_unsupported_cdb;
3185 size = transport_get_size(sectors, cdb, cmd);
3186 cmd->transport_split_cdb = &split_cdb_XX_6;
3187 T_TASK(cmd)->t_task_lba = transport_lba_21(cdb);
3188 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3191 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3193 goto out_unsupported_cdb;
3194 size = transport_get_size(sectors, cdb, cmd);
3195 cmd->transport_split_cdb = &split_cdb_XX_10;
3196 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3197 T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
3198 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3201 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
3203 goto out_unsupported_cdb;
3204 size = transport_get_size(sectors, cdb, cmd);
3205 cmd->transport_split_cdb = &split_cdb_XX_12;
3206 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3207 T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
3208 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3211 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3213 goto out_unsupported_cdb;
3214 size = transport_get_size(sectors, cdb, cmd);
3215 cmd->transport_split_cdb = &split_cdb_XX_16;
3216 T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
3217 T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
3218 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3220 case XDWRITEREAD_10:
3221 if ((cmd->data_direction != DMA_TO_DEVICE) ||
3222 !(T_TASK(cmd)->t_tasks_bidi))
3223 goto out_invalid_cdb_field;
3224 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3226 goto out_unsupported_cdb;
3227 size = transport_get_size(sectors, cdb, cmd);
3228 cmd->transport_split_cdb = &split_cdb_XX_10;
3229 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3230 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3231 passthrough = (TRANSPORT(dev)->transport_type ==
3232 TRANSPORT_PLUGIN_PHBA_PDEV);
3234 * Skip the remaining assignments for TCM/PSCSI passthrough
3239 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3241 cmd->transport_complete_callback = &transport_xor_callback;
3242 T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
3244 case VARIABLE_LENGTH_CMD:
3245 service_action = get_unaligned_be16(&cdb[8]);
3247 * Determine if this is TCM/PSCSI device and we should disable
3248 * internal emulation for this CDB.
3250 passthrough = (TRANSPORT(dev)->transport_type ==
3251 TRANSPORT_PLUGIN_PHBA_PDEV);
3253 switch (service_action) {
3254 case XDWRITEREAD_32:
3255 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
3257 goto out_unsupported_cdb;
3258 size = transport_get_size(sectors, cdb, cmd);
3260 * Use WRITE_32 and READ_32 opcodes for the emulated
3261 * XDWRITE_READ_32 logic.
3263 cmd->transport_split_cdb = &split_cdb_XX_32;
3264 T_TASK(cmd)->t_task_lba = transport_lba_64_ext(cdb);
3265 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3268 * Skip the remaining assignments for TCM/PSCSI passthrough
3274 * Setup BIDI XOR callback to be run during
3275 * transport_generic_complete_ok()
3277 cmd->transport_complete_callback = &transport_xor_callback;
3278 T_TASK(cmd)->t_tasks_fua = (cdb[10] & 0x8);
3281 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
3283 goto out_unsupported_cdb;
3284 size = transport_get_size(sectors, cdb, cmd);
3285 T_TASK(cmd)->t_task_lba = get_unaligned_be64(&cdb[12]);
3286 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3289 * Skip the remaining assignments for TCM/PSCSI passthrough
3294 if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
3295 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3296 " bits not supported for Block Discard"
3298 goto out_invalid_cdb_field;
3301 * Currently for the emulated case we only accept
3302 * tpws with the UNMAP=1 bit set.
3304 if (!(cdb[10] & 0x08)) {
3305 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not"
3306 " supported for Block Discard Emulation\n");
3307 goto out_invalid_cdb_field;
3311 printk(KERN_ERR "VARIABLE_LENGTH_CMD service action"
3312 " 0x%04x not supported\n", service_action);
3313 goto out_unsupported_cdb;
3317 if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
3318 /* MAINTENANCE_IN from SCC-2 */
3320 * Check for emulated MI_REPORT_TARGET_PGS.
3322 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3323 cmd->transport_emulate_cdb =
3324 (T10_ALUA(su_dev)->alua_type ==
3325 SPC3_ALUA_EMULATED) ?
3326 &core_emulate_report_target_port_groups :
3329 size = (cdb[6] << 24) | (cdb[7] << 16) |
3330 (cdb[8] << 8) | cdb[9];
3332 /* GPCMD_SEND_KEY from multi media commands */
3333 size = (cdb[8] << 8) + cdb[9];
3335 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3339 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3341 case MODE_SELECT_10:
3342 size = (cdb[7] << 8) + cdb[8];
3343 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3347 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3350 case GPCMD_READ_BUFFER_CAPACITY:
3351 case GPCMD_SEND_OPC:
3354 size = (cdb[7] << 8) + cdb[8];
3355 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3357 case READ_BLOCK_LIMITS:
3358 size = READ_BLOCK_LEN;
3359 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3361 case GPCMD_GET_CONFIGURATION:
3362 case GPCMD_READ_FORMAT_CAPACITIES:
3363 case GPCMD_READ_DISC_INFO:
3364 case GPCMD_READ_TRACK_RZONE_INFO:
3365 size = (cdb[7] << 8) + cdb[8];
3366 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3368 case PERSISTENT_RESERVE_IN:
3369 case PERSISTENT_RESERVE_OUT:
3370 cmd->transport_emulate_cdb =
3371 (T10_RES(su_dev)->res_type ==
3372 SPC3_PERSISTENT_RESERVATIONS) ?
3373 &core_scsi3_emulate_pr : NULL;
3374 size = (cdb[7] << 8) + cdb[8];
3375 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3377 case GPCMD_MECHANISM_STATUS:
3378 case GPCMD_READ_DVD_STRUCTURE:
3379 size = (cdb[8] << 8) + cdb[9];
3380 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3383 size = READ_POSITION_LEN;
3384 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3387 if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
3388 /* MAINTENANCE_OUT from SCC-2
3390 * Check for emulated MO_SET_TARGET_PGS.
3392 if (cdb[1] == MO_SET_TARGET_PGS) {
3393 cmd->transport_emulate_cdb =
3394 (T10_ALUA(su_dev)->alua_type ==
3395 SPC3_ALUA_EMULATED) ?
3396 &core_emulate_set_target_port_groups :
3400 size = (cdb[6] << 24) | (cdb[7] << 16) |
3401 (cdb[8] << 8) | cdb[9];
3403 /* GPCMD_REPORT_KEY from multi media commands */
3404 size = (cdb[8] << 8) + cdb[9];
3406 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3409 size = (cdb[3] << 8) + cdb[4];
3411 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3412 * See spc4r17 section 5.3
3414 if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3415 cmd->sam_task_attr = TASK_ATTR_HOQ;
3416 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3419 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3420 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3423 size = READ_CAP_LEN;
3424 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3426 case READ_MEDIA_SERIAL_NUMBER:
3427 case SECURITY_PROTOCOL_IN:
3428 case SECURITY_PROTOCOL_OUT:
3429 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3430 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3432 case SERVICE_ACTION_IN:
3433 case ACCESS_CONTROL_IN:
3434 case ACCESS_CONTROL_OUT:
3436 case READ_ATTRIBUTE:
3437 case RECEIVE_COPY_RESULTS:
3438 case WRITE_ATTRIBUTE:
3439 size = (cdb[10] << 24) | (cdb[11] << 16) |
3440 (cdb[12] << 8) | cdb[13];
3441 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3443 case RECEIVE_DIAGNOSTIC:
3444 case SEND_DIAGNOSTIC:
3445 size = (cdb[3] << 8) | cdb[4];
3446 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3448 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3451 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3452 size = (2336 * sectors);
3453 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3458 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3462 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3464 case READ_ELEMENT_STATUS:
3465 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3466 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3469 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3470 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3475 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3476 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3478 if (cdb[0] == RESERVE_10)
3479 size = (cdb[7] << 8) | cdb[8];
3481 size = cmd->data_length;
3484 * Setup the legacy emulated handler for SPC-2 and
3485 * >= SPC-3 compatible reservation handling (CRH=1)
3486 * Otherwise, we assume the underlying SCSI logic is
3487 * is running in SPC_PASSTHROUGH, and wants reservations
3488 * emulation disabled.
3490 cmd->transport_emulate_cdb =
3491 (T10_RES(su_dev)->res_type !=
3493 &core_scsi2_emulate_crh : NULL;
3494 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3499 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3500 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3502 if (cdb[0] == RELEASE_10)
3503 size = (cdb[7] << 8) | cdb[8];
3505 size = cmd->data_length;
3507 cmd->transport_emulate_cdb =
3508 (T10_RES(su_dev)->res_type !=
3510 &core_scsi2_emulate_crh : NULL;
3511 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3513 case SYNCHRONIZE_CACHE:
3514 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3516 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3518 if (cdb[0] == SYNCHRONIZE_CACHE) {
3519 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
3520 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3522 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3523 T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
3526 goto out_unsupported_cdb;
3528 size = transport_get_size(sectors, cdb, cmd);
3529 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3532 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3534 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3537 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3538 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3540 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3542 * Check to ensure that LBA + Range does not exceed past end of
3545 if (transport_get_sectors(cmd) < 0)
3546 goto out_invalid_cdb_field;
3549 size = get_unaligned_be16(&cdb[7]);
3550 passthrough = (TRANSPORT(dev)->transport_type ==
3551 TRANSPORT_PLUGIN_PHBA_PDEV);
3553 * Determine if the received UNMAP used to for direct passthrough
3554 * into Linux/SCSI with struct request via TCM/pSCSI or we are
3555 * signaling the use of internal transport_generic_unmap() emulation
3556 * for UNMAP -> Linux/BLOCK disbard with TCM/IBLOCK and TCM/FILEIO
3557 * subsystem plugin backstores.
3560 cmd->se_cmd_flags |= SCF_EMULATE_SYNC_UNMAP;
3562 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3565 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
3567 goto out_unsupported_cdb;
3568 size = transport_get_size(sectors, cdb, cmd);
3569 T_TASK(cmd)->t_task_lba = get_unaligned_be16(&cdb[2]);
3570 passthrough = (TRANSPORT(dev)->transport_type ==
3571 TRANSPORT_PLUGIN_PHBA_PDEV);
3573 * Determine if the received WRITE_SAME_16 is used to for direct
3574 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3575 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3576 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3577 * TCM/FILEIO subsystem plugin backstores.
3579 if (!(passthrough)) {
3580 if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
3581 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3582 " bits not supported for Block Discard"
3584 goto out_invalid_cdb_field;
3587 * Currently for the emulated case we only accept
3588 * tpws with the UNMAP=1 bit set.
3590 if (!(cdb[1] & 0x08)) {
3591 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not "
3592 " supported for Block Discard Emulation\n");
3593 goto out_invalid_cdb_field;
3596 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3598 case ALLOW_MEDIUM_REMOVAL:
3599 case GPCMD_CLOSE_TRACK:
3601 case INITIALIZE_ELEMENT_STATUS:
3602 case GPCMD_LOAD_UNLOAD:
3605 case GPCMD_SET_SPEED:
3608 case TEST_UNIT_READY:
3610 case WRITE_FILEMARKS:
3612 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3615 cmd->transport_emulate_cdb =
3616 &transport_core_report_lun_response;
3617 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3619 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3620 * See spc4r17 section 5.3
3622 if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3623 cmd->sam_task_attr = TASK_ATTR_HOQ;
3624 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3627 printk(KERN_WARNING "TARGET_CORE[%s]: Unsupported SCSI Opcode"
3628 " 0x%02x, sending CHECK_CONDITION.\n",
3629 CMD_TFO(cmd)->get_fabric_name(), cdb[0]);
3630 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3631 goto out_unsupported_cdb;
3634 if (size != cmd->data_length) {
3635 printk(KERN_WARNING "TARGET_CORE[%s]: Expected Transfer Length:"
3636 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3637 " 0x%02x\n", CMD_TFO(cmd)->get_fabric_name(),
3638 cmd->data_length, size, cdb[0]);
3640 cmd->cmd_spdtl = size;
3642 if (cmd->data_direction == DMA_TO_DEVICE) {
3643 printk(KERN_ERR "Rejecting underflow/overflow"
3645 goto out_invalid_cdb_field;
3648 * Reject READ_* or WRITE_* with overflow/underflow for
3649 * type SCF_SCSI_DATA_SG_IO_CDB.
3651 if (!(ret) && (DEV_ATTRIB(dev)->block_size != 512)) {
3652 printk(KERN_ERR "Failing OVERFLOW/UNDERFLOW for LBA op"
3653 " CDB on non 512-byte sector setup subsystem"
3654 " plugin: %s\n", TRANSPORT(dev)->name);
3655 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3656 goto out_invalid_cdb_field;
3659 if (size > cmd->data_length) {
3660 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3661 cmd->residual_count = (size - cmd->data_length);
3663 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3664 cmd->residual_count = (cmd->data_length - size);
3666 cmd->data_length = size;
3669 transport_set_supported_SAM_opcode(cmd);
3672 out_unsupported_cdb:
3673 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3674 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3676 out_invalid_cdb_field:
3677 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3678 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3682 static inline void transport_release_tasks(struct se_cmd *);
3685 * This function will copy a contiguous *src buffer into a destination
3686 * struct scatterlist array.
3688 static void transport_memcpy_write_contig(
3690 struct scatterlist *sg_d,
3693 u32 i = 0, length = 0, total_length = cmd->data_length;
3696 while (total_length) {
3697 length = sg_d[i].length;
3699 if (length > total_length)
3700 length = total_length;
3702 dst = sg_virt(&sg_d[i]);
3704 memcpy(dst, src, length);
3706 if (!(total_length -= length))
3715 * This function will copy a struct scatterlist array *sg_s into a destination
3716 * contiguous *dst buffer.
3718 static void transport_memcpy_read_contig(
3721 struct scatterlist *sg_s)
3723 u32 i = 0, length = 0, total_length = cmd->data_length;
3726 while (total_length) {
3727 length = sg_s[i].length;
3729 if (length > total_length)
3730 length = total_length;
3732 src = sg_virt(&sg_s[i]);
3734 memcpy(dst, src, length);
3736 if (!(total_length -= length))
3744 static void transport_memcpy_se_mem_read_contig(
3747 struct list_head *se_mem_list)
3749 struct se_mem *se_mem;
3751 u32 length = 0, total_length = cmd->data_length;
3753 list_for_each_entry(se_mem, se_mem_list, se_list) {
3754 length = se_mem->se_len;
3756 if (length > total_length)
3757 length = total_length;
3759 src = page_address(se_mem->se_page) + se_mem->se_off;
3761 memcpy(dst, src, length);
3763 if (!(total_length -= length))
3771 * Called from transport_generic_complete_ok() and
3772 * transport_generic_request_failure() to determine which dormant/delayed
3773 * and ordered cmds need to have their tasks added to the execution queue.
3775 static void transport_complete_task_attr(struct se_cmd *cmd)
3777 struct se_device *dev = SE_DEV(cmd);
3778 struct se_cmd *cmd_p, *cmd_tmp;
3779 int new_active_tasks = 0;
3781 if (cmd->sam_task_attr == TASK_ATTR_SIMPLE) {
3782 atomic_dec(&dev->simple_cmds);
3783 smp_mb__after_atomic_dec();
3784 dev->dev_cur_ordered_id++;
3785 DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for"
3786 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3787 cmd->se_ordered_id);
3788 } else if (cmd->sam_task_attr == TASK_ATTR_HOQ) {
3789 atomic_dec(&dev->dev_hoq_count);
3790 smp_mb__after_atomic_dec();
3791 dev->dev_cur_ordered_id++;
3792 DEBUG_STA("Incremented dev_cur_ordered_id: %u for"
3793 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3794 cmd->se_ordered_id);
3795 } else if (cmd->sam_task_attr == TASK_ATTR_ORDERED) {
3796 spin_lock(&dev->ordered_cmd_lock);
3797 list_del(&cmd->se_ordered_list);
3798 atomic_dec(&dev->dev_ordered_sync);
3799 smp_mb__after_atomic_dec();
3800 spin_unlock(&dev->ordered_cmd_lock);
3802 dev->dev_cur_ordered_id++;
3803 DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:"
3804 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3807 * Process all commands up to the last received
3808 * ORDERED task attribute which requires another blocking
3811 spin_lock(&dev->delayed_cmd_lock);
3812 list_for_each_entry_safe(cmd_p, cmd_tmp,
3813 &dev->delayed_cmd_list, se_delayed_list) {
3815 list_del(&cmd_p->se_delayed_list);
3816 spin_unlock(&dev->delayed_cmd_lock);
3818 DEBUG_STA("Calling add_tasks() for"
3819 " cmd_p: 0x%02x Task Attr: 0x%02x"
3820 " Dormant -> Active, se_ordered_id: %u\n",
3821 T_TASK(cmd_p)->t_task_cdb[0],
3822 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3824 transport_add_tasks_from_cmd(cmd_p);
3827 spin_lock(&dev->delayed_cmd_lock);
3828 if (cmd_p->sam_task_attr == TASK_ATTR_ORDERED)
3831 spin_unlock(&dev->delayed_cmd_lock);
3833 * If new tasks have become active, wake up the transport thread
3834 * to do the processing of the Active tasks.
3836 if (new_active_tasks != 0)
3837 wake_up_interruptible(&dev->dev_queue_obj->thread_wq);
3840 static void transport_generic_complete_ok(struct se_cmd *cmd)
3844 * Check if we need to move delayed/dormant tasks from cmds on the
3845 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3848 if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3849 transport_complete_task_attr(cmd);
3851 * Check if we need to retrieve a sense buffer from
3852 * the struct se_cmd in question.
3854 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3855 if (transport_get_sense_data(cmd) < 0)
3856 reason = TCM_NON_EXISTENT_LUN;
3859 * Only set when an struct se_task->task_scsi_status returned
3860 * a non GOOD status.
3862 if (cmd->scsi_status) {
3863 transport_send_check_condition_and_sense(
3865 transport_lun_remove_cmd(cmd);
3866 transport_cmd_check_stop_to_fabric(cmd);
3871 * Check for a callback, used by amoungst other things
3872 * XDWRITE_READ_10 emulation.
3874 if (cmd->transport_complete_callback)
3875 cmd->transport_complete_callback(cmd);
3877 switch (cmd->data_direction) {
3878 case DMA_FROM_DEVICE:
3879 spin_lock(&cmd->se_lun->lun_sep_lock);
3880 if (SE_LUN(cmd)->lun_sep) {
3881 SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
3884 spin_unlock(&cmd->se_lun->lun_sep_lock);
3886 * If enabled by TCM fabirc module pre-registered SGL
3887 * memory, perform the memcpy() from the TCM internal
3888 * contigious buffer back to the original SGL.
3890 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
3891 transport_memcpy_write_contig(cmd,
3892 T_TASK(cmd)->t_task_pt_sgl,
3893 T_TASK(cmd)->t_task_buf);
3895 CMD_TFO(cmd)->queue_data_in(cmd);
3898 spin_lock(&cmd->se_lun->lun_sep_lock);
3899 if (SE_LUN(cmd)->lun_sep) {
3900 SE_LUN(cmd)->lun_sep->sep_stats.rx_data_octets +=
3903 spin_unlock(&cmd->se_lun->lun_sep_lock);
3905 * Check if we need to send READ payload for BIDI-COMMAND
3907 if (T_TASK(cmd)->t_mem_bidi_list != NULL) {
3908 spin_lock(&cmd->se_lun->lun_sep_lock);
3909 if (SE_LUN(cmd)->lun_sep) {
3910 SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
3913 spin_unlock(&cmd->se_lun->lun_sep_lock);
3914 CMD_TFO(cmd)->queue_data_in(cmd);
3917 /* Fall through for DMA_TO_DEVICE */
3919 CMD_TFO(cmd)->queue_status(cmd);
3925 transport_lun_remove_cmd(cmd);
3926 transport_cmd_check_stop_to_fabric(cmd);
3929 static void transport_free_dev_tasks(struct se_cmd *cmd)
3931 struct se_task *task, *task_tmp;
3932 unsigned long flags;
3934 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
3935 list_for_each_entry_safe(task, task_tmp,
3936 &T_TASK(cmd)->t_task_list, t_list) {
3937 if (atomic_read(&task->task_active))
3940 kfree(task->task_sg_bidi);
3941 kfree(task->task_sg);
3943 list_del(&task->t_list);
3945 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
3947 TRANSPORT(task->se_dev)->free_task(task);
3949 printk(KERN_ERR "task[%u] - task->se_dev is NULL\n",
3951 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
3953 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
3956 static inline void transport_free_pages(struct se_cmd *cmd)
3958 struct se_mem *se_mem, *se_mem_tmp;
3961 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3963 if (cmd->se_dev->transport->do_se_mem_map)
3966 if (T_TASK(cmd)->t_task_buf) {
3967 kfree(T_TASK(cmd)->t_task_buf);
3968 T_TASK(cmd)->t_task_buf = NULL;
3973 * Caller will handle releasing of struct se_mem.
3975 if (cmd->se_cmd_flags & SCF_CMD_PASSTHROUGH_NOALLOC)
3978 if (!(T_TASK(cmd)->t_tasks_se_num))
3981 list_for_each_entry_safe(se_mem, se_mem_tmp,
3982 T_TASK(cmd)->t_mem_list, se_list) {
3984 * We only release call __free_page(struct se_mem->se_page) when
3985 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3988 __free_page(se_mem->se_page);
3990 list_del(&se_mem->se_list);
3991 kmem_cache_free(se_mem_cache, se_mem);
3994 if (T_TASK(cmd)->t_mem_bidi_list && T_TASK(cmd)->t_tasks_se_bidi_num) {
3995 list_for_each_entry_safe(se_mem, se_mem_tmp,
3996 T_TASK(cmd)->t_mem_bidi_list, se_list) {
3998 * We only release call __free_page(struct se_mem->se_page) when
3999 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
4002 __free_page(se_mem->se_page);
4004 list_del(&se_mem->se_list);
4005 kmem_cache_free(se_mem_cache, se_mem);
4009 kfree(T_TASK(cmd)->t_mem_bidi_list);
4010 T_TASK(cmd)->t_mem_bidi_list = NULL;
4011 kfree(T_TASK(cmd)->t_mem_list);
4012 T_TASK(cmd)->t_mem_list = NULL;
4013 T_TASK(cmd)->t_tasks_se_num = 0;
4016 static inline void transport_release_tasks(struct se_cmd *cmd)
4018 transport_free_dev_tasks(cmd);
4021 static inline int transport_dec_and_check(struct se_cmd *cmd)
4023 unsigned long flags;
4025 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
4026 if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
4027 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_fe_count))) {
4028 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
4034 if (atomic_read(&T_TASK(cmd)->t_se_count)) {
4035 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_se_count))) {
4036 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
4041 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4046 static void transport_release_fe_cmd(struct se_cmd *cmd)
4048 unsigned long flags;
4050 if (transport_dec_and_check(cmd))
4053 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
4054 if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
4055 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4058 atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
4059 transport_all_task_dev_remove_state(cmd);
4060 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4062 transport_release_tasks(cmd);
4064 transport_free_pages(cmd);
4065 transport_free_se_cmd(cmd);
4066 CMD_TFO(cmd)->release_cmd_direct(cmd);
4069 static int transport_generic_remove(
4071 int release_to_pool,
4072 int session_reinstatement)
4074 unsigned long flags;
4079 if (transport_dec_and_check(cmd)) {
4080 if (session_reinstatement) {
4081 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
4082 transport_all_task_dev_remove_state(cmd);
4083 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
4089 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
4090 if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
4091 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4094 atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
4095 transport_all_task_dev_remove_state(cmd);
4096 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4098 transport_release_tasks(cmd);
4100 transport_free_pages(cmd);
4103 if (release_to_pool) {
4104 transport_release_cmd_to_pool(cmd);
4106 transport_free_se_cmd(cmd);
4107 CMD_TFO(cmd)->release_cmd_direct(cmd);
4114 * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map
4115 * @cmd: Associated se_cmd descriptor
4116 * @mem: SGL style memory for TCM WRITE / READ
4117 * @sg_mem_num: Number of SGL elements
4118 * @mem_bidi_in: SGL style memory for TCM BIDI READ
4119 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
4121 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
4124 int transport_generic_map_mem_to_cmd(
4126 struct scatterlist *mem,
4128 struct scatterlist *mem_bidi_in,
4129 u32 sg_mem_bidi_num)
4131 u32 se_mem_cnt_out = 0;
4134 if (!(mem) || !(sg_mem_num))
4137 * Passed *mem will contain a list_head containing preformatted
4138 * struct se_mem elements...
4140 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM)) {
4141 if ((mem_bidi_in) || (sg_mem_bidi_num)) {
4142 printk(KERN_ERR "SCF_CMD_PASSTHROUGH_NOALLOC not supported"
4143 " with BIDI-COMMAND\n");
4147 T_TASK(cmd)->t_mem_list = (struct list_head *)mem;
4148 T_TASK(cmd)->t_tasks_se_num = sg_mem_num;
4149 cmd->se_cmd_flags |= SCF_CMD_PASSTHROUGH_NOALLOC;
4153 * Otherwise, assume the caller is passing a struct scatterlist
4154 * array from include/linux/scatterlist.h
4156 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
4157 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
4159 * For CDB using TCM struct se_mem linked list scatterlist memory
4160 * processed into a TCM struct se_subsystem_dev, we do the mapping
4161 * from the passed physical memory to struct se_mem->se_page here.
4163 T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
4164 if (!(T_TASK(cmd)->t_mem_list))
4167 ret = transport_map_sg_to_mem(cmd,
4168 T_TASK(cmd)->t_mem_list, mem, &se_mem_cnt_out);
4172 T_TASK(cmd)->t_tasks_se_num = se_mem_cnt_out;
4174 * Setup BIDI READ list of struct se_mem elements
4176 if ((mem_bidi_in) && (sg_mem_bidi_num)) {
4177 T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
4178 if (!(T_TASK(cmd)->t_mem_bidi_list)) {
4179 kfree(T_TASK(cmd)->t_mem_list);
4184 ret = transport_map_sg_to_mem(cmd,
4185 T_TASK(cmd)->t_mem_bidi_list, mem_bidi_in,
4188 kfree(T_TASK(cmd)->t_mem_list);
4192 T_TASK(cmd)->t_tasks_se_bidi_num = se_mem_cnt_out;
4194 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
4196 } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
4197 if (mem_bidi_in || sg_mem_bidi_num) {
4198 printk(KERN_ERR "BIDI-Commands not supported using "
4199 "SCF_SCSI_CONTROL_NONSG_IO_CDB\n");
4203 * For incoming CDBs using a contiguous buffer internall with TCM,
4204 * save the passed struct scatterlist memory. After TCM storage object
4205 * processing has completed for this struct se_cmd, TCM core will call
4206 * transport_memcpy_[write,read]_contig() as necessary from
4207 * transport_generic_complete_ok() and transport_write_pending() in order
4208 * to copy the TCM buffer to/from the original passed *mem in SGL ->
4209 * struct scatterlist format.
4211 cmd->se_cmd_flags |= SCF_PASSTHROUGH_CONTIG_TO_SG;
4212 T_TASK(cmd)->t_task_pt_sgl = mem;
4217 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
4220 static inline long long transport_dev_end_lba(struct se_device *dev)
4222 return dev->transport->get_blocks(dev) + 1;
4225 static int transport_get_sectors(struct se_cmd *cmd)
4227 struct se_device *dev = SE_DEV(cmd);
4229 T_TASK(cmd)->t_tasks_sectors =
4230 (cmd->data_length / DEV_ATTRIB(dev)->block_size);
4231 if (!(T_TASK(cmd)->t_tasks_sectors))
4232 T_TASK(cmd)->t_tasks_sectors = 1;
4234 if (TRANSPORT(dev)->get_device_type(dev) != TYPE_DISK)
4237 if ((T_TASK(cmd)->t_task_lba + T_TASK(cmd)->t_tasks_sectors) >
4238 transport_dev_end_lba(dev)) {
4239 printk(KERN_ERR "LBA: %llu Sectors: %u exceeds"
4240 " transport_dev_end_lba(): %llu\n",
4241 T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors,
4242 transport_dev_end_lba(dev));
4243 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4244 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
4245 return PYX_TRANSPORT_REQ_TOO_MANY_SECTORS;
4251 static int transport_new_cmd_obj(struct se_cmd *cmd)
4253 struct se_device *dev = SE_DEV(cmd);
4254 u32 task_cdbs = 0, rc;
4256 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
4258 T_TASK(cmd)->t_task_cdbs++;
4263 * Setup any BIDI READ tasks and memory from
4264 * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks
4265 * are queued first for the non pSCSI passthrough case.
4267 if ((T_TASK(cmd)->t_mem_bidi_list != NULL) &&
4268 (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
4269 rc = transport_generic_get_cdb_count(cmd,
4270 T_TASK(cmd)->t_task_lba,
4271 T_TASK(cmd)->t_tasks_sectors,
4272 DMA_FROM_DEVICE, T_TASK(cmd)->t_mem_bidi_list,
4275 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4276 cmd->scsi_sense_reason =
4277 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4278 return PYX_TRANSPORT_LU_COMM_FAILURE;
4283 * Setup the tasks and memory from T_TASK(cmd)->t_mem_list
4284 * Note for BIDI transfers this will contain the WRITE payload
4286 task_cdbs = transport_generic_get_cdb_count(cmd,
4287 T_TASK(cmd)->t_task_lba,
4288 T_TASK(cmd)->t_tasks_sectors,
4289 cmd->data_direction, T_TASK(cmd)->t_mem_list,
4292 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4293 cmd->scsi_sense_reason =
4294 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4295 return PYX_TRANSPORT_LU_COMM_FAILURE;
4297 T_TASK(cmd)->t_task_cdbs += task_cdbs;
4300 printk(KERN_INFO "data_length: %u, LBA: %llu t_tasks_sectors:"
4301 " %u, t_task_cdbs: %u\n", obj_ptr, cmd->data_length,
4302 T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors,
4303 T_TASK(cmd)->t_task_cdbs);
4307 atomic_set(&T_TASK(cmd)->t_task_cdbs_left, task_cdbs);
4308 atomic_set(&T_TASK(cmd)->t_task_cdbs_ex_left, task_cdbs);
4309 atomic_set(&T_TASK(cmd)->t_task_cdbs_timeout_left, task_cdbs);
4313 static struct list_head *transport_init_se_mem_list(void)
4315 struct list_head *se_mem_list;
4317 se_mem_list = kzalloc(sizeof(struct list_head), GFP_KERNEL);
4318 if (!(se_mem_list)) {
4319 printk(KERN_ERR "Unable to allocate memory for se_mem_list\n");
4322 INIT_LIST_HEAD(se_mem_list);
4328 transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
4331 struct se_mem *se_mem;
4333 T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
4334 if (!(T_TASK(cmd)->t_mem_list))
4338 * If the device uses memory mapping this is enough.
4340 if (cmd->se_dev->transport->do_se_mem_map)
4344 * Setup BIDI-COMMAND READ list of struct se_mem elements
4346 if (T_TASK(cmd)->t_tasks_bidi) {
4347 T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
4348 if (!(T_TASK(cmd)->t_mem_bidi_list)) {
4349 kfree(T_TASK(cmd)->t_mem_list);
4355 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4357 printk(KERN_ERR "Unable to allocate struct se_mem\n");
4360 INIT_LIST_HEAD(&se_mem->se_list);
4361 se_mem->se_len = (length > dma_size) ? dma_size : length;
4363 /* #warning FIXME Allocate contigous pages for struct se_mem elements */
4364 se_mem->se_page = (struct page *) alloc_pages(GFP_KERNEL, 0);
4365 if (!(se_mem->se_page)) {
4366 printk(KERN_ERR "alloc_pages() failed\n");
4370 buf = kmap_atomic(se_mem->se_page, KM_IRQ0);
4372 printk(KERN_ERR "kmap_atomic() failed\n");
4375 memset(buf, 0, se_mem->se_len);
4376 kunmap_atomic(buf, KM_IRQ0);
4378 list_add_tail(&se_mem->se_list, T_TASK(cmd)->t_mem_list);
4379 T_TASK(cmd)->t_tasks_se_num++;
4381 DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)"
4382 " Offset(%u)\n", se_mem->se_page, se_mem->se_len,
4385 length -= se_mem->se_len;
4388 DEBUG_MEM("Allocated total struct se_mem elements(%u)\n",
4389 T_TASK(cmd)->t_tasks_se_num);
4396 u32 transport_calc_sg_num(
4397 struct se_task *task,
4398 struct se_mem *in_se_mem,
4401 struct se_cmd *se_cmd = task->task_se_cmd;
4402 struct se_device *se_dev = SE_DEV(se_cmd);
4403 struct se_mem *se_mem = in_se_mem;
4404 struct target_core_fabric_ops *tfo = CMD_TFO(se_cmd);
4405 u32 sg_length, task_size = task->task_size, task_sg_num_padded;
4407 while (task_size != 0) {
4408 DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)"
4409 " se_mem->se_off(%u) task_offset(%u)\n",
4410 se_mem->se_page, se_mem->se_len,
4411 se_mem->se_off, task_offset);
4413 if (task_offset == 0) {
4414 if (task_size >= se_mem->se_len) {
4415 sg_length = se_mem->se_len;
4417 if (!(list_is_last(&se_mem->se_list,
4418 T_TASK(se_cmd)->t_mem_list)))
4419 se_mem = list_entry(se_mem->se_list.next,
4420 struct se_mem, se_list);
4422 sg_length = task_size;
4423 task_size -= sg_length;
4427 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4428 sg_length, task_size);
4430 if ((se_mem->se_len - task_offset) > task_size) {
4431 sg_length = task_size;
4432 task_size -= sg_length;
4435 sg_length = (se_mem->se_len - task_offset);
4437 if (!(list_is_last(&se_mem->se_list,
4438 T_TASK(se_cmd)->t_mem_list)))
4439 se_mem = list_entry(se_mem->se_list.next,
4440 struct se_mem, se_list);
4443 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4444 sg_length, task_size);
4448 task_size -= sg_length;
4450 DEBUG_SC("task[%u] - Reducing task_size to(%u)\n",
4451 task->task_no, task_size);
4453 task->task_sg_num++;
4456 * Check if the fabric module driver is requesting that all
4457 * struct se_task->task_sg[] be chained together.. If so,
4458 * then allocate an extra padding SG entry for linking and
4459 * marking the end of the chained SGL.
4461 if (tfo->task_sg_chaining) {
4462 task_sg_num_padded = (task->task_sg_num + 1);
4463 task->task_padded_sg = 1;
4465 task_sg_num_padded = task->task_sg_num;
4467 task->task_sg = kzalloc(task_sg_num_padded *
4468 sizeof(struct scatterlist), GFP_KERNEL);
4469 if (!(task->task_sg)) {
4470 printk(KERN_ERR "Unable to allocate memory for"
4471 " task->task_sg\n");
4474 sg_init_table(&task->task_sg[0], task_sg_num_padded);
4476 * Setup task->task_sg_bidi for SCSI READ payload for
4477 * TCM/pSCSI passthrough if present for BIDI-COMMAND
4479 if ((T_TASK(se_cmd)->t_mem_bidi_list != NULL) &&
4480 (TRANSPORT(se_dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) {
4481 task->task_sg_bidi = kzalloc(task_sg_num_padded *
4482 sizeof(struct scatterlist), GFP_KERNEL);
4483 if (!(task->task_sg_bidi)) {
4484 printk(KERN_ERR "Unable to allocate memory for"
4485 " task->task_sg_bidi\n");
4488 sg_init_table(&task->task_sg_bidi[0], task_sg_num_padded);
4491 * For the chaining case, setup the proper end of SGL for the
4492 * initial submission struct task into struct se_subsystem_api.
4493 * This will be cleared later by transport_do_task_sg_chain()
4495 if (task->task_padded_sg) {
4496 sg_mark_end(&task->task_sg[task->task_sg_num - 1]);
4498 * Added the 'if' check before marking end of bi-directional
4499 * scatterlist (which gets created only in case of request
4502 if (task->task_sg_bidi)
4503 sg_mark_end(&task->task_sg_bidi[task->task_sg_num - 1]);
4506 DEBUG_SC("Successfully allocated task->task_sg_num(%u),"
4507 " task_sg_num_padded(%u)\n", task->task_sg_num,
4508 task_sg_num_padded);
4510 return task->task_sg_num;
4513 static inline int transport_set_tasks_sectors_disk(
4514 struct se_task *task,
4515 struct se_device *dev,
4516 unsigned long long lba,
4518 int *max_sectors_set)
4520 if ((lba + sectors) > transport_dev_end_lba(dev)) {
4521 task->task_sectors = ((transport_dev_end_lba(dev) - lba) + 1);
4523 if (task->task_sectors > DEV_ATTRIB(dev)->max_sectors) {
4524 task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
4525 *max_sectors_set = 1;
4528 if (sectors > DEV_ATTRIB(dev)->max_sectors) {
4529 task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
4530 *max_sectors_set = 1;
4532 task->task_sectors = sectors;
4538 static inline int transport_set_tasks_sectors_non_disk(
4539 struct se_task *task,
4540 struct se_device *dev,
4541 unsigned long long lba,
4543 int *max_sectors_set)
4545 if (sectors > DEV_ATTRIB(dev)->max_sectors) {
4546 task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
4547 *max_sectors_set = 1;
4549 task->task_sectors = sectors;
4554 static inline int transport_set_tasks_sectors(
4555 struct se_task *task,
4556 struct se_device *dev,
4557 unsigned long long lba,
4559 int *max_sectors_set)
4561 return (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK) ?
4562 transport_set_tasks_sectors_disk(task, dev, lba, sectors,
4564 transport_set_tasks_sectors_non_disk(task, dev, lba, sectors,
4568 static int transport_map_sg_to_mem(
4570 struct list_head *se_mem_list,
4574 struct se_mem *se_mem;
4575 struct scatterlist *sg;
4576 u32 sg_count = 1, cmd_size = cmd->data_length;
4579 printk(KERN_ERR "No source scatterlist\n");
4582 sg = (struct scatterlist *)in_mem;
4585 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4587 printk(KERN_ERR "Unable to allocate struct se_mem\n");
4590 INIT_LIST_HEAD(&se_mem->se_list);
4591 DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u"
4592 " sg_page: %p offset: %d length: %d\n", cmd_size,
4593 sg_page(sg), sg->offset, sg->length);
4595 se_mem->se_page = sg_page(sg);
4596 se_mem->se_off = sg->offset;
4598 if (cmd_size > sg->length) {
4599 se_mem->se_len = sg->length;
4603 se_mem->se_len = cmd_size;
4605 cmd_size -= se_mem->se_len;
4607 DEBUG_MEM("sg_to_mem: *se_mem_cnt: %u cmd_size: %u\n",
4608 *se_mem_cnt, cmd_size);
4609 DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n",
4610 se_mem->se_page, se_mem->se_off, se_mem->se_len);
4612 list_add_tail(&se_mem->se_list, se_mem_list);
4616 DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments to(%u)"
4617 " struct se_mem\n", sg_count, *se_mem_cnt);
4619 if (sg_count != *se_mem_cnt)
4625 /* transport_map_mem_to_sg():
4629 int transport_map_mem_to_sg(
4630 struct se_task *task,
4631 struct list_head *se_mem_list,
4633 struct se_mem *in_se_mem,
4634 struct se_mem **out_se_mem,
4638 struct se_cmd *se_cmd = task->task_se_cmd;
4639 struct se_mem *se_mem = in_se_mem;
4640 struct scatterlist *sg = (struct scatterlist *)in_mem;
4641 u32 task_size = task->task_size, sg_no = 0;
4644 printk(KERN_ERR "Unable to locate valid struct"
4645 " scatterlist pointer\n");
4649 while (task_size != 0) {
4651 * Setup the contigious array of scatterlists for
4652 * this struct se_task.
4654 sg_assign_page(sg, se_mem->se_page);
4656 if (*task_offset == 0) {
4657 sg->offset = se_mem->se_off;
4659 if (task_size >= se_mem->se_len) {
4660 sg->length = se_mem->se_len;
4662 if (!(list_is_last(&se_mem->se_list,
4663 T_TASK(se_cmd)->t_mem_list))) {
4664 se_mem = list_entry(se_mem->se_list.next,
4665 struct se_mem, se_list);
4669 sg->length = task_size;
4671 * Determine if we need to calculate an offset
4672 * into the struct se_mem on the next go around..
4674 task_size -= sg->length;
4676 *task_offset = sg->length;
4682 sg->offset = (*task_offset + se_mem->se_off);
4684 if ((se_mem->se_len - *task_offset) > task_size) {
4685 sg->length = task_size;
4687 * Determine if we need to calculate an offset
4688 * into the struct se_mem on the next go around..
4690 task_size -= sg->length;
4692 *task_offset += sg->length;
4696 sg->length = (se_mem->se_len - *task_offset);
4698 if (!(list_is_last(&se_mem->se_list,
4699 T_TASK(se_cmd)->t_mem_list))) {
4700 se_mem = list_entry(se_mem->se_list.next,
4701 struct se_mem, se_list);
4708 task_size -= sg->length;
4710 DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing"
4711 " task_size to(%u), task_offset: %u\n", task->task_no, sg_no,
4712 sg_page(sg), sg->length, sg->offset, task_size, *task_offset);
4720 if (task_size > se_cmd->data_length)
4723 *out_se_mem = se_mem;
4725 DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)"
4726 " SGs\n", task->task_no, *se_mem_cnt, sg_no);
4732 * This function can be used by HW target mode drivers to create a linked
4733 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4734 * This is intended to be called during the completion path by TCM Core
4735 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4737 void transport_do_task_sg_chain(struct se_cmd *cmd)
4739 struct scatterlist *sg_head = NULL, *sg_link = NULL, *sg_first = NULL;
4740 struct scatterlist *sg_head_cur = NULL, *sg_link_cur = NULL;
4741 struct scatterlist *sg, *sg_end = NULL, *sg_end_cur = NULL;
4742 struct se_task *task;
4743 struct target_core_fabric_ops *tfo = CMD_TFO(cmd);
4744 u32 task_sg_num = 0, sg_count = 0;
4747 if (tfo->task_sg_chaining == 0) {
4748 printk(KERN_ERR "task_sg_chaining is diabled for fabric module:"
4749 " %s\n", tfo->get_fabric_name());
4754 * Walk the struct se_task list and setup scatterlist chains
4755 * for each contiguosly allocated struct se_task->task_sg[].
4757 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
4758 if (!(task->task_sg) || !(task->task_padded_sg))
4761 if (sg_head && sg_link) {
4762 sg_head_cur = &task->task_sg[0];
4763 sg_link_cur = &task->task_sg[task->task_sg_num];
4765 * Either add chain or mark end of scatterlist
4767 if (!(list_is_last(&task->t_list,
4768 &T_TASK(cmd)->t_task_list))) {
4770 * Clear existing SGL termination bit set in
4771 * transport_calc_sg_num(), see sg_mark_end()
4773 sg_end_cur = &task->task_sg[task->task_sg_num - 1];
4774 sg_end_cur->page_link &= ~0x02;
4776 sg_chain(sg_head, task_sg_num, sg_head_cur);
4777 sg_count += (task->task_sg_num + 1);
4779 sg_count += task->task_sg_num;
4781 sg_head = sg_head_cur;
4782 sg_link = sg_link_cur;
4783 task_sg_num = task->task_sg_num;
4786 sg_head = sg_first = &task->task_sg[0];
4787 sg_link = &task->task_sg[task->task_sg_num];
4788 task_sg_num = task->task_sg_num;
4790 * Check for single task..
4792 if (!(list_is_last(&task->t_list, &T_TASK(cmd)->t_task_list))) {
4794 * Clear existing SGL termination bit set in
4795 * transport_calc_sg_num(), see sg_mark_end()
4797 sg_end = &task->task_sg[task->task_sg_num - 1];
4798 sg_end->page_link &= ~0x02;
4799 sg_count += (task->task_sg_num + 1);
4801 sg_count += task->task_sg_num;
4804 * Setup the starting pointer and total t_tasks_sg_linked_no including
4805 * padding SGs for linking and to mark the end.
4807 T_TASK(cmd)->t_tasks_sg_chained = sg_first;
4808 T_TASK(cmd)->t_tasks_sg_chained_no = sg_count;
4810 DEBUG_CMD_M("Setup T_TASK(cmd)->t_tasks_sg_chained: %p and"
4811 " t_tasks_sg_chained_no: %u\n", T_TASK(cmd)->t_tasks_sg_chained,
4812 T_TASK(cmd)->t_tasks_sg_chained_no);
4814 for_each_sg(T_TASK(cmd)->t_tasks_sg_chained, sg,
4815 T_TASK(cmd)->t_tasks_sg_chained_no, i) {
4817 DEBUG_CMD_M("SG: %p page: %p length: %d offset: %d\n",
4818 sg, sg_page(sg), sg->length, sg->offset);
4819 if (sg_is_chain(sg))
4820 DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg);
4822 DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg);
4826 EXPORT_SYMBOL(transport_do_task_sg_chain);
4828 static int transport_do_se_mem_map(
4829 struct se_device *dev,
4830 struct se_task *task,
4831 struct list_head *se_mem_list,
4833 struct se_mem *in_se_mem,
4834 struct se_mem **out_se_mem,
4836 u32 *task_offset_in)
4838 u32 task_offset = *task_offset_in;
4841 * se_subsystem_api_t->do_se_mem_map is used when internal allocation
4842 * has been done by the transport plugin.
4844 if (TRANSPORT(dev)->do_se_mem_map) {
4845 ret = TRANSPORT(dev)->do_se_mem_map(task, se_mem_list,
4846 in_mem, in_se_mem, out_se_mem, se_mem_cnt,
4849 T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt;
4854 BUG_ON(list_empty(se_mem_list));
4856 * This is the normal path for all normal non BIDI and BIDI-COMMAND
4857 * WRITE payloads.. If we need to do BIDI READ passthrough for
4858 * TCM/pSCSI the first call to transport_do_se_mem_map ->
4859 * transport_calc_sg_num() -> transport_map_mem_to_sg() will do the
4860 * allocation for task->task_sg_bidi, and the subsequent call to
4861 * transport_do_se_mem_map() from transport_generic_get_cdb_count()
4863 if (!(task->task_sg_bidi)) {
4865 * Assume default that transport plugin speaks preallocated
4868 if (!(transport_calc_sg_num(task, in_se_mem, task_offset)))
4871 * struct se_task->task_sg now contains the struct scatterlist array.
4873 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg,
4874 in_se_mem, out_se_mem, se_mem_cnt,
4878 * Handle the se_mem_list -> struct task->task_sg_bidi
4879 * memory map for the extra BIDI READ payload
4881 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg_bidi,
4882 in_se_mem, out_se_mem, se_mem_cnt,
4886 static u32 transport_generic_get_cdb_count(
4888 unsigned long long lba,
4890 enum dma_data_direction data_direction,
4891 struct list_head *mem_list,
4894 unsigned char *cdb = NULL;
4895 struct se_task *task;
4896 struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
4897 struct se_mem *se_mem_bidi = NULL, *se_mem_bidi_lout = NULL;
4898 struct se_device *dev = SE_DEV(cmd);
4899 int max_sectors_set = 0, ret;
4900 u32 task_offset_in = 0, se_mem_cnt = 0, se_mem_bidi_cnt = 0, task_cdbs = 0;
4903 printk(KERN_ERR "mem_list is NULL in transport_generic_get"
4908 * While using RAMDISK_DR backstores is the only case where
4909 * mem_list will ever be empty at this point.
4911 if (!(list_empty(mem_list)))
4912 se_mem = list_entry(mem_list->next, struct se_mem, se_list);
4914 * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to
4915 * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation
4917 if ((T_TASK(cmd)->t_mem_bidi_list != NULL) &&
4918 !(list_empty(T_TASK(cmd)->t_mem_bidi_list)) &&
4919 (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV))
4920 se_mem_bidi = list_entry(T_TASK(cmd)->t_mem_bidi_list->next,
4921 struct se_mem, se_list);
4924 DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n",
4925 CMD_TFO(cmd)->get_task_tag(cmd), lba, sectors,
4926 transport_dev_end_lba(dev));
4928 task = transport_generic_get_task(cmd, data_direction);
4932 transport_set_tasks_sectors(task, dev, lba, sectors,
4935 task->task_lba = lba;
4936 lba += task->task_sectors;
4937 sectors -= task->task_sectors;
4938 task->task_size = (task->task_sectors *
4939 DEV_ATTRIB(dev)->block_size);
4941 cdb = TRANSPORT(dev)->get_cdb(task);
4943 memcpy(cdb, T_TASK(cmd)->t_task_cdb,
4944 scsi_command_size(T_TASK(cmd)->t_task_cdb));
4945 cmd->transport_split_cdb(task->task_lba,
4946 &task->task_sectors, cdb);
4950 * Perform the SE OBJ plugin and/or Transport plugin specific
4951 * mapping for T_TASK(cmd)->t_mem_list. And setup the
4952 * task->task_sg and if necessary task->task_sg_bidi
4954 ret = transport_do_se_mem_map(dev, task, mem_list,
4955 NULL, se_mem, &se_mem_lout, &se_mem_cnt,
4960 se_mem = se_mem_lout;
4962 * Setup the T_TASK(cmd)->t_mem_bidi_list -> task->task_sg_bidi
4963 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI
4965 * Note that the first call to transport_do_se_mem_map() above will
4966 * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map()
4967 * -> transport_calc_sg_num(), and the second here will do the
4968 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI.
4970 if (task->task_sg_bidi != NULL) {
4971 ret = transport_do_se_mem_map(dev, task,
4972 T_TASK(cmd)->t_mem_bidi_list, NULL,
4973 se_mem_bidi, &se_mem_bidi_lout, &se_mem_bidi_cnt,
4978 se_mem_bidi = se_mem_bidi_lout;
4982 DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
4983 task_cdbs, task->task_sg_num);
4985 if (max_sectors_set) {
4986 max_sectors_set = 0;
4995 atomic_inc(&T_TASK(cmd)->t_fe_count);
4996 atomic_inc(&T_TASK(cmd)->t_se_count);
4999 DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
5000 CMD_TFO(cmd)->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE)
5001 ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs);
5009 transport_map_control_cmd_to_task(struct se_cmd *cmd)
5011 struct se_device *dev = SE_DEV(cmd);
5013 struct se_task *task;
5016 task = transport_generic_get_task(cmd, cmd->data_direction);
5018 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
5020 cdb = TRANSPORT(dev)->get_cdb(task);
5022 memcpy(cdb, cmd->t_task->t_task_cdb,
5023 scsi_command_size(cmd->t_task->t_task_cdb));
5025 task->task_size = cmd->data_length;
5027 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) ? 1 : 0;
5029 atomic_inc(&cmd->t_task->t_fe_count);
5030 atomic_inc(&cmd->t_task->t_se_count);
5032 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
5033 struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
5034 u32 se_mem_cnt = 0, task_offset = 0;
5036 if (!list_empty(T_TASK(cmd)->t_mem_list))
5037 se_mem = list_entry(T_TASK(cmd)->t_mem_list->next,
5038 struct se_mem, se_list);
5040 ret = transport_do_se_mem_map(dev, task,
5041 cmd->t_task->t_mem_list, NULL, se_mem,
5042 &se_mem_lout, &se_mem_cnt, &task_offset);
5044 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
5046 if (dev->transport->map_task_SG)
5047 return dev->transport->map_task_SG(task);
5049 } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
5050 if (dev->transport->map_task_non_SG)
5051 return dev->transport->map_task_non_SG(task);
5053 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
5054 if (dev->transport->cdb_none)
5055 return dev->transport->cdb_none(task);
5059 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
5063 /* transport_generic_new_cmd(): Called from transport_processing_thread()
5065 * Allocate storage transport resources from a set of values predefined
5066 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
5067 * Any non zero return here is treated as an "out of resource' op here.
5070 * Generate struct se_task(s) and/or their payloads for this CDB.
5072 static int transport_generic_new_cmd(struct se_cmd *cmd)
5074 struct se_portal_group *se_tpg;
5075 struct se_task *task;
5076 struct se_device *dev = SE_DEV(cmd);
5080 * Determine is the TCM fabric module has already allocated physical
5081 * memory, and is directly calling transport_generic_map_mem_to_cmd()
5082 * to setup beforehand the linked list of physical memory at
5083 * T_TASK(cmd)->t_mem_list of struct se_mem->se_page
5085 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
5086 ret = transport_allocate_resources(cmd);
5091 ret = transport_get_sectors(cmd);
5095 ret = transport_new_cmd_obj(cmd);
5100 * Determine if the calling TCM fabric module is talking to
5101 * Linux/NET via kernel sockets and needs to allocate a
5102 * struct iovec array to complete the struct se_cmd
5104 se_tpg = SE_LUN(cmd)->lun_sep->sep_tpg;
5105 if (TPG_TFO(se_tpg)->alloc_cmd_iovecs != NULL) {
5106 ret = TPG_TFO(se_tpg)->alloc_cmd_iovecs(cmd);
5108 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
5111 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
5112 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
5113 if (atomic_read(&task->task_sent))
5115 if (!dev->transport->map_task_SG)
5118 ret = dev->transport->map_task_SG(task);
5123 ret = transport_map_control_cmd_to_task(cmd);
5129 * For WRITEs, let the iSCSI Target RX Thread know its buffer is ready..
5130 * This WRITE struct se_cmd (and all of its associated struct se_task's)
5131 * will be added to the struct se_device execution queue after its WRITE
5132 * data has arrived. (ie: It gets handled by the transport processing
5133 * thread a second time)
5135 if (cmd->data_direction == DMA_TO_DEVICE) {
5136 transport_add_tasks_to_state_queue(cmd);
5137 return transport_generic_write_pending(cmd);
5140 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
5141 * to the execution queue.
5143 transport_execute_tasks(cmd);
5147 /* transport_generic_process_write():
5151 void transport_generic_process_write(struct se_cmd *cmd)
5155 * Copy SCSI Presented DTL sector(s) from received buffers allocated to
5158 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
5159 if (!T_TASK(cmd)->t_tasks_se_num) {
5160 unsigned char *dst, *buf =
5161 (unsigned char *)T_TASK(cmd)->t_task_buf;
5163 dst = kzalloc(cmd->cmd_spdtl), GFP_KERNEL);
5165 printk(KERN_ERR "Unable to allocate memory for"
5166 " WRITE underflow\n");
5167 transport_generic_request_failure(cmd, NULL,
5168 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
5171 memcpy(dst, buf, cmd->cmd_spdtl);
5173 kfree(T_TASK(cmd)->t_task_buf);
5174 T_TASK(cmd)->t_task_buf = dst;
5176 struct scatterlist *sg =
5177 (struct scatterlist *sg)T_TASK(cmd)->t_task_buf;
5178 struct scatterlist *orig_sg;
5180 orig_sg = kzalloc(sizeof(struct scatterlist) *
5181 T_TASK(cmd)->t_tasks_se_num,
5184 printk(KERN_ERR "Unable to allocate memory"
5185 " for WRITE underflow\n");
5186 transport_generic_request_failure(cmd, NULL,
5187 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
5191 memcpy(orig_sg, T_TASK(cmd)->t_task_buf,
5192 sizeof(struct scatterlist) *
5193 T_TASK(cmd)->t_tasks_se_num);
5195 cmd->data_length = cmd->cmd_spdtl;
5197 * FIXME, clear out original struct se_task and state
5200 if (transport_generic_new_cmd(cmd) < 0) {
5201 transport_generic_request_failure(cmd, NULL,
5202 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
5207 transport_memcpy_write_sg(cmd, orig_sg);
5211 transport_execute_tasks(cmd);
5213 EXPORT_SYMBOL(transport_generic_process_write);
5215 /* transport_generic_write_pending():
5219 static int transport_generic_write_pending(struct se_cmd *cmd)
5221 unsigned long flags;
5224 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5225 cmd->t_state = TRANSPORT_WRITE_PENDING;
5226 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5228 * For the TCM control CDBs using a contiguous buffer, do the memcpy
5229 * from the passed Linux/SCSI struct scatterlist located at
5230 * T_TASK(se_cmd)->t_task_pt_buf to the contiguous buffer at
5231 * T_TASK(se_cmd)->t_task_buf.
5233 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
5234 transport_memcpy_read_contig(cmd,
5235 T_TASK(cmd)->t_task_buf,
5236 T_TASK(cmd)->t_task_pt_sgl);
5238 * Clear the se_cmd for WRITE_PENDING status in order to set
5239 * T_TASK(cmd)->t_transport_active=0 so that transport_generic_handle_data
5240 * can be called from HW target mode interrupt code. This is safe
5241 * to be called with transport_off=1 before the CMD_TFO(cmd)->write_pending
5242 * because the se_cmd->se_lun pointer is not being cleared.
5244 transport_cmd_check_stop(cmd, 1, 0);
5247 * Call the fabric write_pending function here to let the
5248 * frontend know that WRITE buffers are ready.
5250 ret = CMD_TFO(cmd)->write_pending(cmd);
5254 return PYX_TRANSPORT_WRITE_PENDING;
5257 /* transport_release_cmd_to_pool():
5261 void transport_release_cmd_to_pool(struct se_cmd *cmd)
5263 BUG_ON(!T_TASK(cmd));
5264 BUG_ON(!CMD_TFO(cmd));
5266 transport_free_se_cmd(cmd);
5267 CMD_TFO(cmd)->release_cmd_to_pool(cmd);
5269 EXPORT_SYMBOL(transport_release_cmd_to_pool);
5271 /* transport_generic_free_cmd():
5273 * Called from processing frontend to release storage engine resources
5275 void transport_generic_free_cmd(
5278 int release_to_pool,
5279 int session_reinstatement)
5281 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) || !T_TASK(cmd))
5282 transport_release_cmd_to_pool(cmd);
5284 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
5288 printk(KERN_INFO "cmd: %p ITT: 0x%08x contains"
5289 " SE_LUN(cmd)\n", cmd,
5290 CMD_TFO(cmd)->get_task_tag(cmd));
5292 transport_lun_remove_cmd(cmd);
5295 if (wait_for_tasks && cmd->transport_wait_for_tasks)
5296 cmd->transport_wait_for_tasks(cmd, 0, 0);
5298 transport_generic_remove(cmd, release_to_pool,
5299 session_reinstatement);
5302 EXPORT_SYMBOL(transport_generic_free_cmd);
5304 static void transport_nop_wait_for_tasks(
5307 int session_reinstatement)
5312 /* transport_lun_wait_for_tasks():
5314 * Called from ConfigFS context to stop the passed struct se_cmd to allow
5315 * an struct se_lun to be successfully shutdown.
5317 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
5319 unsigned long flags;
5322 * If the frontend has already requested this struct se_cmd to
5323 * be stopped, we can safely ignore this struct se_cmd.
5325 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5326 if (atomic_read(&T_TASK(cmd)->t_transport_stop)) {
5327 atomic_set(&T_TASK(cmd)->transport_lun_stop, 0);
5328 DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop =="
5329 " TRUE, skipping\n", CMD_TFO(cmd)->get_task_tag(cmd));
5330 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5331 transport_cmd_check_stop(cmd, 1, 0);
5334 atomic_set(&T_TASK(cmd)->transport_lun_fe_stop, 1);
5335 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5337 wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq);
5339 ret = transport_stop_tasks_for_cmd(cmd);
5341 DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:"
5342 " %d\n", cmd, T_TASK(cmd)->t_task_cdbs, ret);
5344 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
5345 CMD_TFO(cmd)->get_task_tag(cmd));
5346 wait_for_completion(&T_TASK(cmd)->transport_lun_stop_comp);
5347 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
5348 CMD_TFO(cmd)->get_task_tag(cmd));
5350 transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
5355 /* #define DEBUG_CLEAR_LUN */
5356 #ifdef DEBUG_CLEAR_LUN
5357 #define DEBUG_CLEAR_L(x...) printk(KERN_INFO x)
5359 #define DEBUG_CLEAR_L(x...)
5362 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
5364 struct se_cmd *cmd = NULL;
5365 unsigned long lun_flags, cmd_flags;
5367 * Do exception processing and return CHECK_CONDITION status to the
5370 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5371 while (!list_empty_careful(&lun->lun_cmd_list)) {
5372 cmd = list_entry(lun->lun_cmd_list.next,
5373 struct se_cmd, se_lun_list);
5374 list_del(&cmd->se_lun_list);
5376 if (!(T_TASK(cmd))) {
5377 printk(KERN_ERR "ITT: 0x%08x, T_TASK(cmd) = NULL"
5378 "[i,t]_state: %u/%u\n",
5379 CMD_TFO(cmd)->get_task_tag(cmd),
5380 CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state);
5383 atomic_set(&T_TASK(cmd)->transport_lun_active, 0);
5385 * This will notify iscsi_target_transport.c:
5386 * transport_cmd_check_stop() that a LUN shutdown is in
5387 * progress for the iscsi_cmd_t.
5389 spin_lock(&T_TASK(cmd)->t_state_lock);
5390 DEBUG_CLEAR_L("SE_LUN[%d] - Setting T_TASK(cmd)->transport"
5391 "_lun_stop for ITT: 0x%08x\n",
5392 SE_LUN(cmd)->unpacked_lun,
5393 CMD_TFO(cmd)->get_task_tag(cmd));
5394 atomic_set(&T_TASK(cmd)->transport_lun_stop, 1);
5395 spin_unlock(&T_TASK(cmd)->t_state_lock);
5397 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5399 if (!(SE_LUN(cmd))) {
5400 printk(KERN_ERR "ITT: 0x%08x, [i,t]_state: %u/%u\n",
5401 CMD_TFO(cmd)->get_task_tag(cmd),
5402 CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state);
5406 * If the Storage engine still owns the iscsi_cmd_t, determine
5407 * and/or stop its context.
5409 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport"
5410 "_lun_wait_for_tasks()\n", SE_LUN(cmd)->unpacked_lun,
5411 CMD_TFO(cmd)->get_task_tag(cmd));
5413 if (transport_lun_wait_for_tasks(cmd, SE_LUN(cmd)) < 0) {
5414 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5418 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
5419 "_wait_for_tasks(): SUCCESS\n",
5420 SE_LUN(cmd)->unpacked_lun,
5421 CMD_TFO(cmd)->get_task_tag(cmd));
5423 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags);
5424 if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
5425 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
5428 atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
5429 transport_all_task_dev_remove_state(cmd);
5430 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
5432 transport_free_dev_tasks(cmd);
5434 * The Storage engine stopped this struct se_cmd before it was
5435 * send to the fabric frontend for delivery back to the
5436 * Initiator Node. Return this SCSI CDB back with an
5437 * CHECK_CONDITION status.
5440 transport_send_check_condition_and_sense(cmd,
5441 TCM_NON_EXISTENT_LUN, 0);
5443 * If the fabric frontend is waiting for this iscsi_cmd_t to
5444 * be released, notify the waiting thread now that LU has
5445 * finished accessing it.
5447 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags);
5448 if (atomic_read(&T_TASK(cmd)->transport_lun_fe_stop)) {
5449 DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for"
5450 " struct se_cmd: %p ITT: 0x%08x\n",
5452 cmd, CMD_TFO(cmd)->get_task_tag(cmd));
5454 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
5456 transport_cmd_check_stop(cmd, 1, 0);
5457 complete(&T_TASK(cmd)->transport_lun_fe_stop_comp);
5458 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5461 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
5462 lun->unpacked_lun, CMD_TFO(cmd)->get_task_tag(cmd));
5464 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
5465 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5467 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5470 static int transport_clear_lun_thread(void *p)
5472 struct se_lun *lun = (struct se_lun *)p;
5474 __transport_clear_lun_from_sessions(lun);
5475 complete(&lun->lun_shutdown_comp);
5480 int transport_clear_lun_from_sessions(struct se_lun *lun)
5482 struct task_struct *kt;
5484 kt = kthread_run(transport_clear_lun_thread, (void *)lun,
5485 "tcm_cl_%u", lun->unpacked_lun);
5487 printk(KERN_ERR "Unable to start clear_lun thread\n");
5490 wait_for_completion(&lun->lun_shutdown_comp);
5495 /* transport_generic_wait_for_tasks():
5497 * Called from frontend or passthrough context to wait for storage engine
5498 * to pause and/or release frontend generated struct se_cmd.
5500 static void transport_generic_wait_for_tasks(
5503 int session_reinstatement)
5505 unsigned long flags;
5507 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
5510 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5512 * If we are already stopped due to an external event (ie: LUN shutdown)
5513 * sleep until the connection can have the passed struct se_cmd back.
5514 * The T_TASK(cmd)->transport_lun_stopped_sem will be upped by
5515 * transport_clear_lun_from_sessions() once the ConfigFS context caller
5516 * has completed its operation on the struct se_cmd.
5518 if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) {
5520 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping"
5521 " wait_for_completion(&T_TASK(cmd)transport_lun_fe"
5522 "_stop_comp); for ITT: 0x%08x\n",
5523 CMD_TFO(cmd)->get_task_tag(cmd));
5525 * There is a special case for WRITES where a FE exception +
5526 * LUN shutdown means ConfigFS context is still sleeping on
5527 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
5528 * We go ahead and up transport_lun_stop_comp just to be sure
5531 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5532 complete(&T_TASK(cmd)->transport_lun_stop_comp);
5533 wait_for_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp);
5534 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5536 transport_all_task_dev_remove_state(cmd);
5538 * At this point, the frontend who was the originator of this
5539 * struct se_cmd, now owns the structure and can be released through
5540 * normal means below.
5542 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped"
5543 " wait_for_completion(&T_TASK(cmd)transport_lun_fe_"
5544 "stop_comp); for ITT: 0x%08x\n",
5545 CMD_TFO(cmd)->get_task_tag(cmd));
5547 atomic_set(&T_TASK(cmd)->transport_lun_stop, 0);
5549 if (!atomic_read(&T_TASK(cmd)->t_transport_active) ||
5550 atomic_read(&T_TASK(cmd)->t_transport_aborted))
5553 atomic_set(&T_TASK(cmd)->t_transport_stop, 1);
5555 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x"
5556 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
5557 " = TRUE\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd),
5558 CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state,
5559 cmd->deferred_t_state);
5561 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5563 wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq);
5565 wait_for_completion(&T_TASK(cmd)->t_transport_stop_comp);
5567 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5568 atomic_set(&T_TASK(cmd)->t_transport_active, 0);
5569 atomic_set(&T_TASK(cmd)->t_transport_stop, 0);
5571 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion("
5572 "&T_TASK(cmd)->t_transport_stop_comp) for ITT: 0x%08x\n",
5573 CMD_TFO(cmd)->get_task_tag(cmd));
5575 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5579 transport_generic_free_cmd(cmd, 0, 0, session_reinstatement);
5582 static int transport_get_sense_codes(
5587 *asc = cmd->scsi_asc;
5588 *ascq = cmd->scsi_ascq;
5593 static int transport_set_sense_codes(
5598 cmd->scsi_asc = asc;
5599 cmd->scsi_ascq = ascq;
5604 int transport_send_check_condition_and_sense(
5609 unsigned char *buffer = cmd->sense_buffer;
5610 unsigned long flags;
5612 u8 asc = 0, ascq = 0;
5614 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5615 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
5616 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5619 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
5620 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5622 if (!reason && from_transport)
5625 if (!from_transport)
5626 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
5628 * Data Segment and SenseLength of the fabric response PDU.
5630 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
5631 * from include/scsi/scsi_cmnd.h
5633 offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd,
5634 TRANSPORT_SENSE_BUFFER);
5636 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
5637 * SENSE KEY values from include/scsi/scsi.h
5640 case TCM_NON_EXISTENT_LUN:
5641 case TCM_UNSUPPORTED_SCSI_OPCODE:
5642 case TCM_SECTOR_COUNT_TOO_MANY:
5644 buffer[offset] = 0x70;
5645 /* ILLEGAL REQUEST */
5646 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5647 /* INVALID COMMAND OPERATION CODE */
5648 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
5650 case TCM_UNKNOWN_MODE_PAGE:
5652 buffer[offset] = 0x70;
5653 /* ILLEGAL REQUEST */
5654 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5655 /* INVALID FIELD IN CDB */
5656 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5658 case TCM_CHECK_CONDITION_ABORT_CMD:
5660 buffer[offset] = 0x70;
5661 /* ABORTED COMMAND */
5662 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5663 /* BUS DEVICE RESET FUNCTION OCCURRED */
5664 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
5665 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
5667 case TCM_INCORRECT_AMOUNT_OF_DATA:
5669 buffer[offset] = 0x70;
5670 /* ABORTED COMMAND */
5671 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5673 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5674 /* NOT ENOUGH UNSOLICITED DATA */
5675 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
5677 case TCM_INVALID_CDB_FIELD:
5679 buffer[offset] = 0x70;
5680 /* ABORTED COMMAND */
5681 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5682 /* INVALID FIELD IN CDB */
5683 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5685 case TCM_INVALID_PARAMETER_LIST:
5687 buffer[offset] = 0x70;
5688 /* ABORTED COMMAND */
5689 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5690 /* INVALID FIELD IN PARAMETER LIST */
5691 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
5693 case TCM_UNEXPECTED_UNSOLICITED_DATA:
5695 buffer[offset] = 0x70;
5696 /* ABORTED COMMAND */
5697 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5699 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5700 /* UNEXPECTED_UNSOLICITED_DATA */
5701 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
5703 case TCM_SERVICE_CRC_ERROR:
5705 buffer[offset] = 0x70;
5706 /* ABORTED COMMAND */
5707 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5708 /* PROTOCOL SERVICE CRC ERROR */
5709 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
5711 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
5713 case TCM_SNACK_REJECTED:
5715 buffer[offset] = 0x70;
5716 /* ABORTED COMMAND */
5717 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5719 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
5720 /* FAILED RETRANSMISSION REQUEST */
5721 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
5723 case TCM_WRITE_PROTECTED:
5725 buffer[offset] = 0x70;
5727 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
5728 /* WRITE PROTECTED */
5729 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
5731 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
5733 buffer[offset] = 0x70;
5734 /* UNIT ATTENTION */
5735 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
5736 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
5737 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5738 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5740 case TCM_CHECK_CONDITION_NOT_READY:
5742 buffer[offset] = 0x70;
5744 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
5745 transport_get_sense_codes(cmd, &asc, &ascq);
5746 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5747 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5749 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
5752 buffer[offset] = 0x70;
5753 /* ILLEGAL REQUEST */
5754 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5755 /* LOGICAL UNIT COMMUNICATION FAILURE */
5756 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
5760 * This code uses linux/include/scsi/scsi.h SAM status codes!
5762 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
5764 * Automatically padded, this value is encoded in the fabric's
5765 * data_length response PDU containing the SCSI defined sense data.
5767 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
5770 CMD_TFO(cmd)->queue_status(cmd);
5773 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
5775 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
5779 if (atomic_read(&T_TASK(cmd)->t_transport_aborted) != 0) {
5780 if (!(send_status) ||
5781 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
5784 printk(KERN_INFO "Sending delayed SAM_STAT_TASK_ABORTED"
5785 " status for CDB: 0x%02x ITT: 0x%08x\n",
5786 T_TASK(cmd)->t_task_cdb[0],
5787 CMD_TFO(cmd)->get_task_tag(cmd));
5789 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
5790 CMD_TFO(cmd)->queue_status(cmd);
5795 EXPORT_SYMBOL(transport_check_aborted_status);
5797 void transport_send_task_abort(struct se_cmd *cmd)
5800 * If there are still expected incoming fabric WRITEs, we wait
5801 * until until they have completed before sending a TASK_ABORTED
5802 * response. This response with TASK_ABORTED status will be
5803 * queued back to fabric module by transport_check_aborted_status().
5805 if (cmd->data_direction == DMA_TO_DEVICE) {
5806 if (CMD_TFO(cmd)->write_pending_status(cmd) != 0) {
5807 atomic_inc(&T_TASK(cmd)->t_transport_aborted);
5808 smp_mb__after_atomic_inc();
5809 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5810 transport_new_cmd_failure(cmd);
5814 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5816 printk(KERN_INFO "Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
5817 " ITT: 0x%08x\n", T_TASK(cmd)->t_task_cdb[0],
5818 CMD_TFO(cmd)->get_task_tag(cmd));
5820 CMD_TFO(cmd)->queue_status(cmd);
5823 /* transport_generic_do_tmr():
5827 int transport_generic_do_tmr(struct se_cmd *cmd)
5829 struct se_cmd *ref_cmd;
5830 struct se_device *dev = SE_DEV(cmd);
5831 struct se_tmr_req *tmr = cmd->se_tmr_req;
5834 switch (tmr->function) {
5836 ref_cmd = tmr->ref_cmd;
5837 tmr->response = TMR_FUNCTION_REJECTED;
5839 case ABORT_TASK_SET:
5841 case CLEAR_TASK_SET:
5842 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
5845 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
5846 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
5847 TMR_FUNCTION_REJECTED;
5850 case TARGET_WARM_RESET:
5851 transport_generic_host_reset(dev->se_hba);
5852 tmr->response = TMR_FUNCTION_REJECTED;
5854 case TARGET_COLD_RESET:
5855 transport_generic_host_reset(dev->se_hba);
5856 transport_generic_cold_reset(dev->se_hba);
5857 tmr->response = TMR_FUNCTION_REJECTED;
5861 printk(KERN_ERR "Uknown TMR function: 0x%02x.\n",
5863 tmr->response = TMR_FUNCTION_REJECTED;
5867 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
5868 CMD_TFO(cmd)->queue_tm_rsp(cmd);
5870 transport_cmd_check_stop(cmd, 2, 0);
5875 * Called with spin_lock_irq(&dev->execute_task_lock); held
5878 static struct se_task *
5879 transport_get_task_from_state_list(struct se_device *dev)
5881 struct se_task *task;
5883 if (list_empty(&dev->state_task_list))
5886 list_for_each_entry(task, &dev->state_task_list, t_state_list)
5889 list_del(&task->t_state_list);
5890 atomic_set(&task->task_state_active, 0);
5895 static void transport_processing_shutdown(struct se_device *dev)
5898 struct se_queue_req *qr;
5899 struct se_task *task;
5901 unsigned long flags;
5903 * Empty the struct se_device's struct se_task state list.
5905 spin_lock_irqsave(&dev->execute_task_lock, flags);
5906 while ((task = transport_get_task_from_state_list(dev))) {
5907 if (!(TASK_CMD(task))) {
5908 printk(KERN_ERR "TASK_CMD(task) is NULL!\n");
5911 cmd = TASK_CMD(task);
5914 printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:"
5915 " %p ITT: 0x%08x\n", task, cmd,
5916 CMD_TFO(cmd)->get_task_tag(cmd));
5919 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5921 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5923 DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x,"
5924 " i_state/def_i_state: %d/%d, t_state/def_t_state:"
5925 " %d/%d cdb: 0x%02x\n", cmd, task,
5926 CMD_TFO(cmd)->get_task_tag(cmd), cmd->cmd_sn,
5927 CMD_TFO(cmd)->get_cmd_state(cmd), cmd->deferred_i_state,
5928 cmd->t_state, cmd->deferred_t_state,
5929 T_TASK(cmd)->t_task_cdb[0]);
5930 DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:"
5931 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5932 " t_transport_stop: %d t_transport_sent: %d\n",
5933 CMD_TFO(cmd)->get_task_tag(cmd),
5934 T_TASK(cmd)->t_task_cdbs,
5935 atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
5936 atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
5937 atomic_read(&T_TASK(cmd)->t_transport_active),
5938 atomic_read(&T_TASK(cmd)->t_transport_stop),
5939 atomic_read(&T_TASK(cmd)->t_transport_sent));
5941 if (atomic_read(&task->task_active)) {
5942 atomic_set(&task->task_stop, 1);
5943 spin_unlock_irqrestore(
5944 &T_TASK(cmd)->t_state_lock, flags);
5946 DEBUG_DO("Waiting for task: %p to shutdown for dev:"
5947 " %p\n", task, dev);
5948 wait_for_completion(&task->task_stop_comp);
5949 DEBUG_DO("Completed task: %p shutdown for dev: %p\n",
5952 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5953 atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
5955 atomic_set(&task->task_active, 0);
5956 atomic_set(&task->task_stop, 0);
5958 if (atomic_read(&task->task_execute_queue) != 0)
5959 transport_remove_task_from_execute_queue(task, dev);
5961 __transport_stop_task_timer(task, &flags);
5963 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) {
5964 spin_unlock_irqrestore(
5965 &T_TASK(cmd)->t_state_lock, flags);
5967 DEBUG_DO("Skipping task: %p, dev: %p for"
5968 " t_task_cdbs_ex_left: %d\n", task, dev,
5969 atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left));
5971 spin_lock_irqsave(&dev->execute_task_lock, flags);
5975 if (atomic_read(&T_TASK(cmd)->t_transport_active)) {
5976 DEBUG_DO("got t_transport_active = 1 for task: %p, dev:"
5977 " %p\n", task, dev);
5979 if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
5980 spin_unlock_irqrestore(
5981 &T_TASK(cmd)->t_state_lock, flags);
5982 transport_send_check_condition_and_sense(
5983 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5985 transport_remove_cmd_from_queue(cmd,
5986 SE_DEV(cmd)->dev_queue_obj);
5988 transport_lun_remove_cmd(cmd);
5989 transport_cmd_check_stop(cmd, 1, 0);
5991 spin_unlock_irqrestore(
5992 &T_TASK(cmd)->t_state_lock, flags);
5994 transport_remove_cmd_from_queue(cmd,
5995 SE_DEV(cmd)->dev_queue_obj);
5997 transport_lun_remove_cmd(cmd);
5999 if (transport_cmd_check_stop(cmd, 1, 0))
6000 transport_generic_remove(cmd, 0, 0);
6003 spin_lock_irqsave(&dev->execute_task_lock, flags);
6006 DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n",
6009 if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
6010 spin_unlock_irqrestore(
6011 &T_TASK(cmd)->t_state_lock, flags);
6012 transport_send_check_condition_and_sense(cmd,
6013 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
6014 transport_remove_cmd_from_queue(cmd,
6015 SE_DEV(cmd)->dev_queue_obj);
6017 transport_lun_remove_cmd(cmd);
6018 transport_cmd_check_stop(cmd, 1, 0);
6020 spin_unlock_irqrestore(
6021 &T_TASK(cmd)->t_state_lock, flags);
6023 transport_remove_cmd_from_queue(cmd,
6024 SE_DEV(cmd)->dev_queue_obj);
6025 transport_lun_remove_cmd(cmd);
6027 if (transport_cmd_check_stop(cmd, 1, 0))
6028 transport_generic_remove(cmd, 0, 0);
6031 spin_lock_irqsave(&dev->execute_task_lock, flags);
6033 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
6035 * Empty the struct se_device's struct se_cmd list.
6037 spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
6038 while ((qr = __transport_get_qr_from_queue(dev->dev_queue_obj))) {
6039 spin_unlock_irqrestore(
6040 &dev->dev_queue_obj->cmd_queue_lock, flags);
6041 cmd = (struct se_cmd *)qr->cmd;
6045 DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n",
6048 if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
6049 transport_send_check_condition_and_sense(cmd,
6050 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
6052 transport_lun_remove_cmd(cmd);
6053 transport_cmd_check_stop(cmd, 1, 0);
6055 transport_lun_remove_cmd(cmd);
6056 if (transport_cmd_check_stop(cmd, 1, 0))
6057 transport_generic_remove(cmd, 0, 0);
6059 spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
6061 spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags);
6064 /* transport_processing_thread():
6068 static int transport_processing_thread(void *param)
6072 struct se_device *dev = (struct se_device *) param;
6073 struct se_queue_req *qr;
6075 set_user_nice(current, -20);
6077 while (!kthread_should_stop()) {
6078 ret = wait_event_interruptible(dev->dev_queue_obj->thread_wq,
6079 atomic_read(&dev->dev_queue_obj->queue_cnt) ||
6080 kthread_should_stop());
6084 spin_lock_irq(&dev->dev_status_lock);
6085 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
6086 spin_unlock_irq(&dev->dev_status_lock);
6087 transport_processing_shutdown(dev);
6090 spin_unlock_irq(&dev->dev_status_lock);
6093 __transport_execute_tasks(dev);
6095 qr = transport_get_qr_from_queue(dev->dev_queue_obj);
6099 cmd = (struct se_cmd *)qr->cmd;
6100 t_state = qr->state;
6104 case TRANSPORT_NEW_CMD_MAP:
6105 if (!(CMD_TFO(cmd)->new_cmd_map)) {
6106 printk(KERN_ERR "CMD_TFO(cmd)->new_cmd_map is"
6107 " NULL for TRANSPORT_NEW_CMD_MAP\n");
6110 ret = CMD_TFO(cmd)->new_cmd_map(cmd);
6112 cmd->transport_error_status = ret;
6113 transport_generic_request_failure(cmd, NULL,
6114 0, (cmd->data_direction !=
6119 case TRANSPORT_NEW_CMD:
6120 ret = transport_generic_new_cmd(cmd);
6122 cmd->transport_error_status = ret;
6123 transport_generic_request_failure(cmd, NULL,
6124 0, (cmd->data_direction !=
6128 case TRANSPORT_PROCESS_WRITE:
6129 transport_generic_process_write(cmd);
6131 case TRANSPORT_COMPLETE_OK:
6132 transport_stop_all_task_timers(cmd);
6133 transport_generic_complete_ok(cmd);
6135 case TRANSPORT_REMOVE:
6136 transport_generic_remove(cmd, 1, 0);
6138 case TRANSPORT_PROCESS_TMR:
6139 transport_generic_do_tmr(cmd);
6141 case TRANSPORT_COMPLETE_FAILURE:
6142 transport_generic_request_failure(cmd, NULL, 1, 1);
6144 case TRANSPORT_COMPLETE_TIMEOUT:
6145 transport_stop_all_task_timers(cmd);
6146 transport_generic_request_timeout(cmd);
6149 printk(KERN_ERR "Unknown t_state: %d deferred_t_state:"
6150 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
6151 " %u\n", t_state, cmd->deferred_t_state,
6152 CMD_TFO(cmd)->get_task_tag(cmd),
6153 CMD_TFO(cmd)->get_cmd_state(cmd),
6154 SE_LUN(cmd)->unpacked_lun);
6162 transport_release_all_cmds(dev);
6163 dev->process_thread = NULL;