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target: Pass 2nd param of transport_split_cdb by value
[linux-block.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
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
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
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.
17 *
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.
22 *
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.
26 *
27 ******************************************************************************/
28
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>
c66ac9db
NB		 37#include <linux/kthread.h>
38#include <linux/in.h>
39#include <linux/cdrom.h>
40#include <asm/unaligned.h>
41#include <net/sock.h>
42#include <net/tcp.h>
43#include <scsi/scsi.h>
44#include <scsi/scsi_cmnd.h>
e66ecd50 45#include <scsi/scsi_tcq.h>
c66ac9db
NB		 46
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>
54
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"
60
61/* #define DEBUG_CDB_HANDLER */
62#ifdef DEBUG_CDB_HANDLER
63#define DEBUG_CDB_H(x...) printk(KERN_INFO x)
64#else
65#define DEBUG_CDB_H(x...)
66#endif
67
68/* #define DEBUG_CMD_MAP */
69#ifdef DEBUG_CMD_MAP
70#define DEBUG_CMD_M(x...) printk(KERN_INFO x)
71#else
72#define DEBUG_CMD_M(x...)
73#endif
74
75/* #define DEBUG_MEM_ALLOC */
76#ifdef DEBUG_MEM_ALLOC
77#define DEBUG_MEM(x...) printk(KERN_INFO x)
78#else
79#define DEBUG_MEM(x...)
80#endif
81
82/* #define DEBUG_MEM2_ALLOC */
83#ifdef DEBUG_MEM2_ALLOC
84#define DEBUG_MEM2(x...) printk(KERN_INFO x)
85#else
86#define DEBUG_MEM2(x...)
87#endif
88
89/* #define DEBUG_SG_CALC */
90#ifdef DEBUG_SG_CALC
91#define DEBUG_SC(x...) printk(KERN_INFO x)
92#else
93#define DEBUG_SC(x...)
94#endif
95
96/* #define DEBUG_SE_OBJ */
97#ifdef DEBUG_SE_OBJ
98#define DEBUG_SO(x...) printk(KERN_INFO x)
99#else
100#define DEBUG_SO(x...)
101#endif
102
103/* #define DEBUG_CMD_VOL */
104#ifdef DEBUG_CMD_VOL
105#define DEBUG_VOL(x...) printk(KERN_INFO x)
106#else
107#define DEBUG_VOL(x...)
108#endif
109
110/* #define DEBUG_CMD_STOP */
111#ifdef DEBUG_CMD_STOP
112#define DEBUG_CS(x...) printk(KERN_INFO x)
113#else
114#define DEBUG_CS(x...)
115#endif
116
117/* #define DEBUG_PASSTHROUGH */
118#ifdef DEBUG_PASSTHROUGH
119#define DEBUG_PT(x...) printk(KERN_INFO x)
120#else
121#define DEBUG_PT(x...)
122#endif
123
124/* #define DEBUG_TASK_STOP */
125#ifdef DEBUG_TASK_STOP
126#define DEBUG_TS(x...) printk(KERN_INFO x)
127#else
128#define DEBUG_TS(x...)
129#endif
130
131/* #define DEBUG_TRANSPORT_STOP */
132#ifdef DEBUG_TRANSPORT_STOP
133#define DEBUG_TRANSPORT_S(x...) printk(KERN_INFO x)
134#else
135#define DEBUG_TRANSPORT_S(x...)
136#endif
137
138/* #define DEBUG_TASK_FAILURE */
139#ifdef DEBUG_TASK_FAILURE
140#define DEBUG_TF(x...) printk(KERN_INFO x)
141#else
142#define DEBUG_TF(x...)
143#endif
144
145/* #define DEBUG_DEV_OFFLINE */
146#ifdef DEBUG_DEV_OFFLINE
147#define DEBUG_DO(x...) printk(KERN_INFO x)
148#else
149#define DEBUG_DO(x...)
150#endif
151
152/* #define DEBUG_TASK_STATE */
153#ifdef DEBUG_TASK_STATE
154#define DEBUG_TSTATE(x...) printk(KERN_INFO x)
155#else
156#define DEBUG_TSTATE(x...)
157#endif
158
159/* #define DEBUG_STATUS_THR */
160#ifdef DEBUG_STATUS_THR
161#define DEBUG_ST(x...) printk(KERN_INFO x)
162#else
163#define DEBUG_ST(x...)
164#endif
165
166/* #define DEBUG_TASK_TIMEOUT */
167#ifdef DEBUG_TASK_TIMEOUT
168#define DEBUG_TT(x...) printk(KERN_INFO x)
169#else
170#define DEBUG_TT(x...)
171#endif
172
173/* #define DEBUG_GENERIC_REQUEST_FAILURE */
174#ifdef DEBUG_GENERIC_REQUEST_FAILURE
175#define DEBUG_GRF(x...) printk(KERN_INFO x)
176#else
177#define DEBUG_GRF(x...)
178#endif
179
180/* #define DEBUG_SAM_TASK_ATTRS */
181#ifdef DEBUG_SAM_TASK_ATTRS
182#define DEBUG_STA(x...) printk(KERN_INFO x)
183#else
184#define DEBUG_STA(x...)
185#endif
186
e3d6f909 187static int sub_api_initialized;
c66ac9db
NB		 188
189static struct kmem_cache *se_cmd_cache;
190static struct kmem_cache *se_sess_cache;
191struct kmem_cache *se_tmr_req_cache;
192struct kmem_cache *se_ua_cache;
193struct kmem_cache *se_mem_cache;
194struct kmem_cache *t10_pr_reg_cache;
195struct kmem_cache *t10_alua_lu_gp_cache;
196struct kmem_cache *t10_alua_lu_gp_mem_cache;
197struct kmem_cache *t10_alua_tg_pt_gp_cache;
198struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
199
200/* Used for transport_dev_get_map_*() */
201typedef int (*map_func_t)(struct se_task *, u32);
202
203static int transport_generic_write_pending(struct se_cmd *);
5951146d 204static int transport_processing_thread(void *param);
c66ac9db
NB		 205static int __transport_execute_tasks(struct se_device *dev);
206static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a
NB		 207static int transport_complete_qf(struct se_cmd *cmd);
208static void transport_handle_queue_full(struct se_cmd *cmd,
209 struct se_device *dev, int (*qf_callback)(struct se_cmd *));
c66ac9db
NB		 210static void transport_direct_request_timeout(struct se_cmd *cmd);
211static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 212static u32 transport_allocate_tasks(struct se_cmd *cmd,
c66ac9db
NB		 213 unsigned long long starting_lba, u32 sectors,
214 enum dma_data_direction data_direction,
215 struct list_head *mem_list, int set_counts);
05d1c7c0 216static int transport_generic_get_mem(struct se_cmd *cmd);
c66ac9db 217static int transport_generic_remove(struct se_cmd *cmd,
35462975 218 int session_reinstatement);
a1d8b49a 219static int transport_cmd_get_valid_sectors(struct se_cmd *cmd);
c66ac9db 220static int transport_map_sg_to_mem(struct se_cmd *cmd,
a1d8b49a
AG		 221 struct list_head *se_mem_list, struct scatterlist *sgl);
222static void transport_memcpy_se_mem_read_contig(unsigned char *dst,
223 struct list_head *se_mem_list, u32 len);
c66ac9db
NB		 224static void transport_release_fe_cmd(struct se_cmd *cmd);
225static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
226 struct se_queue_obj *qobj);
227static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
228static void transport_stop_all_task_timers(struct se_cmd *cmd);
229
e3d6f909 230int init_se_kmem_caches(void)
c66ac9db 231{
c66ac9db
NB		 232 se_cmd_cache = kmem_cache_create("se_cmd_cache",
233 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
234 if (!(se_cmd_cache)) {
235 printk(KERN_ERR "kmem_cache_create for struct se_cmd failed\n");
236 goto out;
237 }
238 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
239 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
240 0, NULL);
241 if (!(se_tmr_req_cache)) {
242 printk(KERN_ERR "kmem_cache_create() for struct se_tmr_req"
243 " failed\n");
244 goto out;
245 }
246 se_sess_cache = kmem_cache_create("se_sess_cache",
247 sizeof(struct se_session), __alignof__(struct se_session),
248 0, NULL);
249 if (!(se_sess_cache)) {
250 printk(KERN_ERR "kmem_cache_create() for struct se_session"
251 " failed\n");
252 goto out;
253 }
254 se_ua_cache = kmem_cache_create("se_ua_cache",
255 sizeof(struct se_ua), __alignof__(struct se_ua),
256 0, NULL);
257 if (!(se_ua_cache)) {
258 printk(KERN_ERR "kmem_cache_create() for struct se_ua failed\n");
259 goto out;
260 }
261 se_mem_cache = kmem_cache_create("se_mem_cache",
262 sizeof(struct se_mem), __alignof__(struct se_mem), 0, NULL);
263 if (!(se_mem_cache)) {
264 printk(KERN_ERR "kmem_cache_create() for struct se_mem failed\n");
265 goto out;
266 }
267 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
268 sizeof(struct t10_pr_registration),
269 __alignof__(struct t10_pr_registration), 0, NULL);
270 if (!(t10_pr_reg_cache)) {
271 printk(KERN_ERR "kmem_cache_create() for struct t10_pr_registration"
272 " failed\n");
273 goto out;
274 }
275 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
276 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
277 0, NULL);
278 if (!(t10_alua_lu_gp_cache)) {
279 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_cache"
280 " failed\n");
281 goto out;
282 }
283 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
284 sizeof(struct t10_alua_lu_gp_member),
285 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
286 if (!(t10_alua_lu_gp_mem_cache)) {
287 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_mem_"
288 "cache failed\n");
289 goto out;
290 }
291 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
292 sizeof(struct t10_alua_tg_pt_gp),
293 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
294 if (!(t10_alua_tg_pt_gp_cache)) {
295 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
296 "cache failed\n");
297 goto out;
298 }
299 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
300 "t10_alua_tg_pt_gp_mem_cache",
301 sizeof(struct t10_alua_tg_pt_gp_member),
302 __alignof__(struct t10_alua_tg_pt_gp_member),
303 0, NULL);
304 if (!(t10_alua_tg_pt_gp_mem_cache)) {
305 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
306 "mem_t failed\n");
307 goto out;
308 }
309
c66ac9db
NB		 310 return 0;
311out:
312 if (se_cmd_cache)
313 kmem_cache_destroy(se_cmd_cache);
314 if (se_tmr_req_cache)
315 kmem_cache_destroy(se_tmr_req_cache);
316 if (se_sess_cache)
317 kmem_cache_destroy(se_sess_cache);
318 if (se_ua_cache)
319 kmem_cache_destroy(se_ua_cache);
320 if (se_mem_cache)
321 kmem_cache_destroy(se_mem_cache);
322 if (t10_pr_reg_cache)
323 kmem_cache_destroy(t10_pr_reg_cache);
324 if (t10_alua_lu_gp_cache)
325 kmem_cache_destroy(t10_alua_lu_gp_cache);
326 if (t10_alua_lu_gp_mem_cache)
327 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
328 if (t10_alua_tg_pt_gp_cache)
329 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
330 if (t10_alua_tg_pt_gp_mem_cache)
331 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 332 return -ENOMEM;
c66ac9db
NB		 333}
334
e3d6f909 335void release_se_kmem_caches(void)
c66ac9db 336{
c66ac9db
NB		 337 kmem_cache_destroy(se_cmd_cache);
338 kmem_cache_destroy(se_tmr_req_cache);
339 kmem_cache_destroy(se_sess_cache);
340 kmem_cache_destroy(se_ua_cache);
341 kmem_cache_destroy(se_mem_cache);
342 kmem_cache_destroy(t10_pr_reg_cache);
343 kmem_cache_destroy(t10_alua_lu_gp_cache);
344 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
345 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
346 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 347}
348
e3d6f909
AG		 349/* This code ensures unique mib indexes are handed out. */
350static DEFINE_SPINLOCK(scsi_mib_index_lock);
351static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 352
353/*
354 * Allocate a new row index for the entry type specified
355 */
356u32 scsi_get_new_index(scsi_index_t type)
357{
358 u32 new_index;
359
e3d6f909 360 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 361
e3d6f909
AG		 362 spin_lock(&scsi_mib_index_lock);
363 new_index = ++scsi_mib_index[type];
364 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 365
366 return new_index;
367}
368
c66ac9db
NB		 369void transport_init_queue_obj(struct se_queue_obj *qobj)
370{
371 atomic_set(&qobj->queue_cnt, 0);
372 INIT_LIST_HEAD(&qobj->qobj_list);
373 init_waitqueue_head(&qobj->thread_wq);
374 spin_lock_init(&qobj->cmd_queue_lock);
375}
376EXPORT_SYMBOL(transport_init_queue_obj);
377
378static int transport_subsystem_reqmods(void)
379{
380 int ret;
381
382 ret = request_module("target_core_iblock");
383 if (ret != 0)
384 printk(KERN_ERR "Unable to load target_core_iblock\n");
385
386 ret = request_module("target_core_file");
387 if (ret != 0)
388 printk(KERN_ERR "Unable to load target_core_file\n");
389
390 ret = request_module("target_core_pscsi");
391 if (ret != 0)
392 printk(KERN_ERR "Unable to load target_core_pscsi\n");
393
394 ret = request_module("target_core_stgt");
395 if (ret != 0)
396 printk(KERN_ERR "Unable to load target_core_stgt\n");
397
398 return 0;
399}
400
401int transport_subsystem_check_init(void)
402{
e3d6f909
AG		 403 int ret;
404
405 if (sub_api_initialized)
c66ac9db
NB		 406 return 0;
407 /*
408 * Request the loading of known TCM subsystem plugins..
409 */
e3d6f909
AG		 410 ret = transport_subsystem_reqmods();
411 if (ret < 0)
412 return ret;
c66ac9db 413
e3d6f909 414 sub_api_initialized = 1;
c66ac9db
NB		 415 return 0;
416}
417
418struct se_session *transport_init_session(void)
419{
420 struct se_session *se_sess;
421
422 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
423 if (!(se_sess)) {
424 printk(KERN_ERR "Unable to allocate struct se_session from"
425 " se_sess_cache\n");
426 return ERR_PTR(-ENOMEM);
427 }
428 INIT_LIST_HEAD(&se_sess->sess_list);
429 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 430
431 return se_sess;
432}
433EXPORT_SYMBOL(transport_init_session);
434
435/*
436 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
437 */
438void __transport_register_session(
439 struct se_portal_group *se_tpg,
440 struct se_node_acl *se_nacl,
441 struct se_session *se_sess,
442 void *fabric_sess_ptr)
443{
444 unsigned char buf[PR_REG_ISID_LEN];
445
446 se_sess->se_tpg = se_tpg;
447 se_sess->fabric_sess_ptr = fabric_sess_ptr;
448 /*
449 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
450 *
451 * Only set for struct se_session's that will actually be moving I/O.
452 * eg: *NOT* discovery sessions.
453 */
454 if (se_nacl) {
455 /*
456 * If the fabric module supports an ISID based TransportID,
457 * save this value in binary from the fabric I_T Nexus now.
458 */
e3d6f909 459 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 460 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 461 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 462 &buf[0], PR_REG_ISID_LEN);
463 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
464 }
465 spin_lock_irq(&se_nacl->nacl_sess_lock);
466 /*
467 * The se_nacl->nacl_sess pointer will be set to the
468 * last active I_T Nexus for each struct se_node_acl.
469 */
470 se_nacl->nacl_sess = se_sess;
471
472 list_add_tail(&se_sess->sess_acl_list,
473 &se_nacl->acl_sess_list);
474 spin_unlock_irq(&se_nacl->nacl_sess_lock);
475 }
476 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
477
478 printk(KERN_INFO "TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 479 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 480}
481EXPORT_SYMBOL(__transport_register_session);
482
483void transport_register_session(
484 struct se_portal_group *se_tpg,
485 struct se_node_acl *se_nacl,
486 struct se_session *se_sess,
487 void *fabric_sess_ptr)
488{
489 spin_lock_bh(&se_tpg->session_lock);
490 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
491 spin_unlock_bh(&se_tpg->session_lock);
492}
493EXPORT_SYMBOL(transport_register_session);
494
495void transport_deregister_session_configfs(struct se_session *se_sess)
496{
497 struct se_node_acl *se_nacl;
23388864 498 unsigned long flags;
c66ac9db
NB		 499 /*
500 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
501 */
502 se_nacl = se_sess->se_node_acl;
503 if ((se_nacl)) {
23388864 504 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 505 list_del(&se_sess->sess_acl_list);
506 /*
507 * If the session list is empty, then clear the pointer.
508 * Otherwise, set the struct se_session pointer from the tail
509 * element of the per struct se_node_acl active session list.
510 */
511 if (list_empty(&se_nacl->acl_sess_list))
512 se_nacl->nacl_sess = NULL;
513 else {
514 se_nacl->nacl_sess = container_of(
515 se_nacl->acl_sess_list.prev,
516 struct se_session, sess_acl_list);
517 }
23388864 518 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 519 }
520}
521EXPORT_SYMBOL(transport_deregister_session_configfs);
522
523void transport_free_session(struct se_session *se_sess)
524{
525 kmem_cache_free(se_sess_cache, se_sess);
526}
527EXPORT_SYMBOL(transport_free_session);
528
529void transport_deregister_session(struct se_session *se_sess)
530{
531 struct se_portal_group *se_tpg = se_sess->se_tpg;
532 struct se_node_acl *se_nacl;
533
534 if (!(se_tpg)) {
535 transport_free_session(se_sess);
536 return;
537 }
c66ac9db
NB		 538
539 spin_lock_bh(&se_tpg->session_lock);
540 list_del(&se_sess->sess_list);
541 se_sess->se_tpg = NULL;
542 se_sess->fabric_sess_ptr = NULL;
543 spin_unlock_bh(&se_tpg->session_lock);
544
545 /*
546 * Determine if we need to do extra work for this initiator node's
547 * struct se_node_acl if it had been previously dynamically generated.
548 */
549 se_nacl = se_sess->se_node_acl;
550 if ((se_nacl)) {
551 spin_lock_bh(&se_tpg->acl_node_lock);
552 if (se_nacl->dynamic_node_acl) {
e3d6f909 553 if (!(se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
c66ac9db
NB		 554 se_tpg))) {
555 list_del(&se_nacl->acl_list);
556 se_tpg->num_node_acls--;
557 spin_unlock_bh(&se_tpg->acl_node_lock);
558
559 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 560 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 561 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db
NB		 562 se_nacl);
563 spin_lock_bh(&se_tpg->acl_node_lock);
564 }
565 }
566 spin_unlock_bh(&se_tpg->acl_node_lock);
567 }
568
569 transport_free_session(se_sess);
570
571 printk(KERN_INFO "TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 572 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 573}
574EXPORT_SYMBOL(transport_deregister_session);
575
576/*
a1d8b49a 577 * Called with cmd->t_state_lock held.
c66ac9db
NB		 578 */
579static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
580{
581 struct se_device *dev;
582 struct se_task *task;
583 unsigned long flags;
584
a1d8b49a 585 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 586 dev = task->se_dev;
587 if (!(dev))
588 continue;
589
590 if (atomic_read(&task->task_active))
591 continue;
592
593 if (!(atomic_read(&task->task_state_active)))
594 continue;
595
596 spin_lock_irqsave(&dev->execute_task_lock, flags);
597 list_del(&task->t_state_list);
598 DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n",
e3d6f909 599 cmd->se_tfo->tfo_get_task_tag(cmd), dev, task);
c66ac9db
NB		 600 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
601
602 atomic_set(&task->task_state_active, 0);
a1d8b49a 603 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 604 }
605}
606
607/* transport_cmd_check_stop():
608 *
609 * 'transport_off = 1' determines if t_transport_active should be cleared.
610 * 'transport_off = 2' determines if task_dev_state should be removed.
611 *
612 * A non-zero u8 t_state sets cmd->t_state.
613 * Returns 1 when command is stopped, else 0.
614 */
615static int transport_cmd_check_stop(
616 struct se_cmd *cmd,
617 int transport_off,
618 u8 t_state)
619{
620 unsigned long flags;
621
a1d8b49a 622 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 623 /*
624 * Determine if IOCTL context caller in requesting the stopping of this
625 * command for LUN shutdown purposes.
626 */
a1d8b49a
AG		 627 if (atomic_read(&cmd->transport_lun_stop)) {
628 DEBUG_CS("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 629 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 630 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 631
632 cmd->deferred_t_state = cmd->t_state;
633 cmd->t_state = TRANSPORT_DEFERRED_CMD;
a1d8b49a 634 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 635 if (transport_off == 2)
636 transport_all_task_dev_remove_state(cmd);
a1d8b49a 637 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 638
a1d8b49a 639 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 640 return 1;
641 }
642 /*
643 * Determine if frontend context caller is requesting the stopping of
e3d6f909 644 * this command for frontend exceptions.
c66ac9db 645 */
a1d8b49a
AG		 646 if (atomic_read(&cmd->t_transport_stop)) {
647 DEBUG_CS("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 648 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 649 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 650
651 cmd->deferred_t_state = cmd->t_state;
652 cmd->t_state = TRANSPORT_DEFERRED_CMD;
653 if (transport_off == 2)
654 transport_all_task_dev_remove_state(cmd);
655
656 /*
657 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
658 * to FE.
659 */
660 if (transport_off == 2)
661 cmd->se_lun = NULL;
a1d8b49a 662 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 663
a1d8b49a 664 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 665 return 1;
666 }
667 if (transport_off) {
a1d8b49a 668 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 669 if (transport_off == 2) {
670 transport_all_task_dev_remove_state(cmd);
671 /*
672 * Clear struct se_cmd->se_lun before the transport_off == 2
673 * handoff to fabric module.
674 */
675 cmd->se_lun = NULL;
676 /*
677 * Some fabric modules like tcm_loop can release
25985edc 678 * their internally allocated I/O reference now and
c66ac9db
NB		 679 * struct se_cmd now.
680 */
e3d6f909 681 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 682 spin_unlock_irqrestore(
a1d8b49a 683 &cmd->t_state_lock, flags);
c66ac9db 684
e3d6f909 685 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 686 return 1;
687 }
688 }
a1d8b49a 689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 690
691 return 0;
692 } else if (t_state)
693 cmd->t_state = t_state;
a1d8b49a 694 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 695
696 return 0;
697}
698
699static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
700{
701 return transport_cmd_check_stop(cmd, 2, 0);
702}
703
704static void transport_lun_remove_cmd(struct se_cmd *cmd)
705{
e3d6f909 706 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 707 unsigned long flags;
708
709 if (!lun)
710 return;
711
a1d8b49a
AG		 712 spin_lock_irqsave(&cmd->t_state_lock, flags);
713 if (!(atomic_read(&cmd->transport_dev_active))) {
714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 715 goto check_lun;
716 }
a1d8b49a 717 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 718 transport_all_task_dev_remove_state(cmd);
a1d8b49a 719 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 720
c66ac9db
NB		 721
722check_lun:
723 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 724 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 725 list_del(&cmd->se_lun_node);
a1d8b49a 726 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 727#if 0
728 printk(KERN_INFO "Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 729 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 730#endif
731 }
732 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
733}
734
735void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
736{
5951146d 737 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 738 transport_lun_remove_cmd(cmd);
739
740 if (transport_cmd_check_stop_to_fabric(cmd))
741 return;
742 if (remove)
35462975 743 transport_generic_remove(cmd, 0);
c66ac9db
NB		 744}
745
746void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
747{
5951146d 748 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 749
750 if (transport_cmd_check_stop_to_fabric(cmd))
751 return;
752
35462975 753 transport_generic_remove(cmd, 0);
c66ac9db
NB		 754}
755
5951146d 756static void transport_add_cmd_to_queue(
c66ac9db
NB		 757 struct se_cmd *cmd,
758 int t_state)
759{
760 struct se_device *dev = cmd->se_dev;
e3d6f909 761 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 762 unsigned long flags;
763
5951146d 764 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db
NB		 765
766 if (t_state) {
a1d8b49a 767 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 768 cmd->t_state = t_state;
a1d8b49a
AG		 769 atomic_set(&cmd->t_transport_active, 1);
770 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 771 }
772
773 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
07bde79a
NB		 774 if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
775 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
776 list_add(&cmd->se_queue_node, &qobj->qobj_list);
777 } else
778 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
a1d8b49a 779 atomic_inc(&cmd->t_transport_queue_active);
c66ac9db
NB		 780 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
781
782 atomic_inc(&qobj->queue_cnt);
783 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 784}
785
5951146d
AG		 786static struct se_cmd *
787transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 788{
5951146d 789 struct se_cmd *cmd;
c66ac9db
NB		 790 unsigned long flags;
791
792 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
793 if (list_empty(&qobj->qobj_list)) {
794 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
795 return NULL;
796 }
5951146d 797 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 798
a1d8b49a 799 atomic_dec(&cmd->t_transport_queue_active);
c66ac9db 800
5951146d 801 list_del(&cmd->se_queue_node);
c66ac9db
NB		 802 atomic_dec(&qobj->queue_cnt);
803 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
804
5951146d 805 return cmd;
c66ac9db
NB		 806}
807
808static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
809 struct se_queue_obj *qobj)
810{
5951146d 811 struct se_cmd *t;
c66ac9db
NB		 812 unsigned long flags;
813
814 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
a1d8b49a 815 if (!(atomic_read(&cmd->t_transport_queue_active))) {
c66ac9db
NB		 816 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
817 return;
818 }
819
5951146d
AG		 820 list_for_each_entry(t, &qobj->qobj_list, se_queue_node)
821 if (t == cmd) {
a1d8b49a 822 atomic_dec(&cmd->t_transport_queue_active);
5951146d
AG		 823 atomic_dec(&qobj->queue_cnt);
824 list_del(&cmd->se_queue_node);
825 break;
826 }
c66ac9db
NB		 827 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
828
a1d8b49a 829 if (atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db 830 printk(KERN_ERR "ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 831 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 832 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 833 }
834}
835
836/*
837 * Completion function used by TCM subsystem plugins (such as FILEIO)
838 * for queueing up response from struct se_subsystem_api->do_task()
839 */
840void transport_complete_sync_cache(struct se_cmd *cmd, int good)
841{
a1d8b49a 842 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 843 struct se_task, t_list);
844
845 if (good) {
846 cmd->scsi_status = SAM_STAT_GOOD;
847 task->task_scsi_status = GOOD;
848 } else {
849 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
850 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 851 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 852 PYX_TRANSPORT_ILLEGAL_REQUEST;
853 }
854
855 transport_complete_task(task, good);
856}
857EXPORT_SYMBOL(transport_complete_sync_cache);
858
859/* transport_complete_task():
860 *
861 * Called from interrupt and non interrupt context depending
862 * on the transport plugin.
863 */
864void transport_complete_task(struct se_task *task, int success)
865{
e3d6f909 866 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 867 struct se_device *dev = task->se_dev;
868 int t_state;
869 unsigned long flags;
870#if 0
871 printk(KERN_INFO "task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 872 cmd->t_task_cdb[0], dev);
c66ac9db 873#endif
e3d6f909 874 if (dev)
c66ac9db 875 atomic_inc(&dev->depth_left);
c66ac9db 876
a1d8b49a 877 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 878 atomic_set(&task->task_active, 0);
879
880 /*
881 * See if any sense data exists, if so set the TASK_SENSE flag.
882 * Also check for any other post completion work that needs to be
883 * done by the plugins.
884 */
885 if (dev && dev->transport->transport_complete) {
886 if (dev->transport->transport_complete(task) != 0) {
887 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
888 task->task_sense = 1;
889 success = 1;
890 }
891 }
892
893 /*
894 * See if we are waiting for outstanding struct se_task
895 * to complete for an exception condition
896 */
897 if (atomic_read(&task->task_stop)) {
898 /*
a1d8b49a 899 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 900 * previously thrown its timeout exception handler.
901 */
902 if (atomic_read(&task->task_timeout)) {
a1d8b49a 903 atomic_dec(&cmd->t_se_count);
c66ac9db
NB		 904 atomic_set(&task->task_timeout, 0);
905 }
a1d8b49a 906 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 907
908 complete(&task->task_stop_comp);
909 return;
910 }
911 /*
912 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
913 * left counter to determine when the struct se_cmd is ready to be queued to
914 * the processing thread.
915 */
916 if (atomic_read(&task->task_timeout)) {
917 if (!(atomic_dec_and_test(
a1d8b49a
AG		 918 &cmd->t_task_cdbs_timeout_left))) {
919 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 920 flags);
921 return;
922 }
923 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 924 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 925
926 transport_add_cmd_to_queue(cmd, t_state);
927 return;
928 }
a1d8b49a 929 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 930
931 /*
932 * Decrement the outstanding t_task_cdbs_left count. The last
933 * struct se_task from struct se_cmd will complete itself into the
934 * device queue depending upon int success.
935 */
a1d8b49a 936 if (!(atomic_dec_and_test(&cmd->t_task_cdbs_left))) {
c66ac9db 937 if (!success)
a1d8b49a 938 cmd->t_tasks_failed = 1;
c66ac9db 939
a1d8b49a 940 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 941 return;
942 }
943
a1d8b49a 944 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 945 t_state = TRANSPORT_COMPLETE_FAILURE;
946 if (!task->task_error_status) {
947 task->task_error_status =
948 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
949 cmd->transport_error_status =
950 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
951 }
952 } else {
a1d8b49a 953 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 954 t_state = TRANSPORT_COMPLETE_OK;
955 }
a1d8b49a 956 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 957
958 transport_add_cmd_to_queue(cmd, t_state);
959}
960EXPORT_SYMBOL(transport_complete_task);
961
962/*
963 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
964 * struct se_task list are ready to be added to the active execution list
965 * struct se_device
966
967 * Called with se_dev_t->execute_task_lock called.
968 */
969static inline int transport_add_task_check_sam_attr(
970 struct se_task *task,
971 struct se_task *task_prev,
972 struct se_device *dev)
973{
974 /*
975 * No SAM Task attribute emulation enabled, add to tail of
976 * execution queue
977 */
978 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
979 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
980 return 0;
981 }
982 /*
983 * HEAD_OF_QUEUE attribute for received CDB, which means
984 * the first task that is associated with a struct se_cmd goes to
985 * head of the struct se_device->execute_task_list, and task_prev
986 * after that for each subsequent task
987 */
e66ecd50 988 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 989 list_add(&task->t_execute_list,
990 (task_prev != NULL) ?
991 &task_prev->t_execute_list :
992 &dev->execute_task_list);
993
994 DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
995 " in execution queue\n",
996 T_TASK(task->task_se_cmd)->t_task_cdb[0]);
997 return 1;
998 }
999 /*
1000 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
1001 * transitioned from Dermant -> Active state, and are added to the end
1002 * of the struct se_device->execute_task_list
1003 */
1004 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
1005 return 0;
1006}
1007
1008/* __transport_add_task_to_execute_queue():
1009 *
1010 * Called with se_dev_t->execute_task_lock called.
1011 */
1012static void __transport_add_task_to_execute_queue(
1013 struct se_task *task,
1014 struct se_task *task_prev,
1015 struct se_device *dev)
1016{
1017 int head_of_queue;
1018
1019 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
1020 atomic_inc(&dev->execute_tasks);
1021
1022 if (atomic_read(&task->task_state_active))
1023 return;
1024 /*
1025 * Determine if this task needs to go to HEAD_OF_QUEUE for the
1026 * state list as well. Running with SAM Task Attribute emulation
1027 * will always return head_of_queue == 0 here
1028 */
1029 if (head_of_queue)
1030 list_add(&task->t_state_list, (task_prev) ?
1031 &task_prev->t_state_list :
1032 &dev->state_task_list);
1033 else
1034 list_add_tail(&task->t_state_list, &dev->state_task_list);
1035
1036 atomic_set(&task->task_state_active, 1);
1037
1038 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 1039 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 1040 task, dev);
1041}
1042
1043static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
1044{
1045 struct se_device *dev;
1046 struct se_task *task;
1047 unsigned long flags;
1048
a1d8b49a
AG		 1049 spin_lock_irqsave(&cmd->t_state_lock, flags);
1050 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 1051 dev = task->se_dev;
1052
1053 if (atomic_read(&task->task_state_active))
1054 continue;
1055
1056 spin_lock(&dev->execute_task_lock);
1057 list_add_tail(&task->t_state_list, &dev->state_task_list);
1058 atomic_set(&task->task_state_active, 1);
1059
1060 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 1061 task->se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 1062 task->task_se_cmd), task, dev);
1063
1064 spin_unlock(&dev->execute_task_lock);
1065 }
a1d8b49a 1066 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1067}
1068
1069static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
1070{
5951146d 1071 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1072 struct se_task *task, *task_prev = NULL;
1073 unsigned long flags;
1074
1075 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 1076 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 1077 if (atomic_read(&task->task_execute_queue))
1078 continue;
1079 /*
1080 * __transport_add_task_to_execute_queue() handles the
1081 * SAM Task Attribute emulation if enabled
1082 */
1083 __transport_add_task_to_execute_queue(task, task_prev, dev);
1084 atomic_set(&task->task_execute_queue, 1);
1085 task_prev = task;
1086 }
1087 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 1088}
1089
1090/* transport_remove_task_from_execute_queue():
1091 *
1092 *
1093 */
52208ae3 1094void transport_remove_task_from_execute_queue(
c66ac9db
NB		 1095 struct se_task *task,
1096 struct se_device *dev)
1097{
1098 unsigned long flags;
1099
af57c3ac
NB		 1100 if (atomic_read(&task->task_execute_queue) == 0) {
1101 dump_stack();
1102 return;
1103 }
1104
c66ac9db
NB		 1105 spin_lock_irqsave(&dev->execute_task_lock, flags);
1106 list_del(&task->t_execute_list);
af57c3ac 1107 atomic_set(&task->task_execute_queue, 0);
c66ac9db
NB		 1108 atomic_dec(&dev->execute_tasks);
1109 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
1110}
1111
07bde79a
NB		 1112/*
1113 * Handle QUEUE_FULL / -EAGAIN status
1114 */
1115
1116static void target_qf_do_work(struct work_struct *work)
1117{
1118 struct se_device *dev = container_of(work, struct se_device,
1119 qf_work_queue);
1120 struct se_cmd *cmd, *cmd_tmp;
1121
1122 spin_lock_irq(&dev->qf_cmd_lock);
1123 list_for_each_entry_safe(cmd, cmd_tmp, &dev->qf_cmd_list, se_qf_node) {
1124
1125 list_del(&cmd->se_qf_node);
1126 atomic_dec(&dev->dev_qf_count);
1127 smp_mb__after_atomic_dec();
1128 spin_unlock_irq(&dev->qf_cmd_lock);
1129
1130 printk(KERN_INFO "Processing %s cmd: %p QUEUE_FULL in work queue"
1131 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
1132 (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
1133 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
1134 : "UNKNOWN");
1135 /*
1136 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
1137 * has been added to head of queue
1138 */
1139 transport_add_cmd_to_queue(cmd, cmd->t_state);
1140
1141 spin_lock_irq(&dev->qf_cmd_lock);
1142 }
1143 spin_unlock_irq(&dev->qf_cmd_lock);
1144}
1145
c66ac9db
NB		 1146unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1147{
1148 switch (cmd->data_direction) {
1149 case DMA_NONE:
1150 return "NONE";
1151 case DMA_FROM_DEVICE:
1152 return "READ";
1153 case DMA_TO_DEVICE:
1154 return "WRITE";
1155 case DMA_BIDIRECTIONAL:
1156 return "BIDI";
1157 default:
1158 break;
1159 }
1160
1161 return "UNKNOWN";
1162}
1163
1164void transport_dump_dev_state(
1165 struct se_device *dev,
1166 char *b,
1167 int *bl)
1168{
1169 *bl += sprintf(b + *bl, "Status: ");
1170 switch (dev->dev_status) {
1171 case TRANSPORT_DEVICE_ACTIVATED:
1172 *bl += sprintf(b + *bl, "ACTIVATED");
1173 break;
1174 case TRANSPORT_DEVICE_DEACTIVATED:
1175 *bl += sprintf(b + *bl, "DEACTIVATED");
1176 break;
1177 case TRANSPORT_DEVICE_SHUTDOWN:
1178 *bl += sprintf(b + *bl, "SHUTDOWN");
1179 break;
1180 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1181 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1182 *bl += sprintf(b + *bl, "OFFLINE");
1183 break;
1184 default:
1185 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1186 break;
1187 }
1188
1189 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1190 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1191 dev->queue_depth);
1192 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1193 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1194 *bl += sprintf(b + *bl, " ");
1195}
1196
1197/* transport_release_all_cmds():
1198 *
1199 *
1200 */
1201static void transport_release_all_cmds(struct se_device *dev)
1202{
5951146d 1203 struct se_cmd *cmd, *tcmd;
c66ac9db
NB		 1204 int bug_out = 0, t_state;
1205 unsigned long flags;
1206
e3d6f909 1207 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
5951146d
AG		 1208 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1209 se_queue_node) {
1210 t_state = cmd->t_state;
1211 list_del(&cmd->se_queue_node);
e3d6f909 1212 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
c66ac9db
NB		 1213 flags);
1214
1215 printk(KERN_ERR "Releasing ITT: 0x%08x, i_state: %u,"
1216 " t_state: %u directly\n",
e3d6f909
AG		 1217 cmd->se_tfo->get_task_tag(cmd),
1218 cmd->se_tfo->get_cmd_state(cmd), t_state);
c66ac9db
NB		 1219
1220 transport_release_fe_cmd(cmd);
1221 bug_out = 1;
1222
e3d6f909 1223 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db 1224 }
e3d6f909 1225 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db
NB		 1226#if 0
1227 if (bug_out)
1228 BUG();
1229#endif
1230}
1231
1232void transport_dump_vpd_proto_id(
1233 struct t10_vpd *vpd,
1234 unsigned char *p_buf,
1235 int p_buf_len)
1236{
1237 unsigned char buf[VPD_TMP_BUF_SIZE];
1238 int len;
1239
1240 memset(buf, 0, VPD_TMP_BUF_SIZE);
1241 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1242
1243 switch (vpd->protocol_identifier) {
1244 case 0x00:
1245 sprintf(buf+len, "Fibre Channel\n");
1246 break;
1247 case 0x10:
1248 sprintf(buf+len, "Parallel SCSI\n");
1249 break;
1250 case 0x20:
1251 sprintf(buf+len, "SSA\n");
1252 break;
1253 case 0x30:
1254 sprintf(buf+len, "IEEE 1394\n");
1255 break;
1256 case 0x40:
1257 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1258 " Protocol\n");
1259 break;
1260 case 0x50:
1261 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1262 break;
1263 case 0x60:
1264 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1265 break;
1266 case 0x70:
1267 sprintf(buf+len, "Automation/Drive Interface Transport"
1268 " Protocol\n");
1269 break;
1270 case 0x80:
1271 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1272 break;
1273 default:
1274 sprintf(buf+len, "Unknown 0x%02x\n",
1275 vpd->protocol_identifier);
1276 break;
1277 }
1278
1279 if (p_buf)
1280 strncpy(p_buf, buf, p_buf_len);
1281 else
1282 printk(KERN_INFO "%s", buf);
1283}
1284
1285void
1286transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1287{
1288 /*
1289 * Check if the Protocol Identifier Valid (PIV) bit is set..
1290 *
1291 * from spc3r23.pdf section 7.5.1
1292 */
1293 if (page_83[1] & 0x80) {
1294 vpd->protocol_identifier = (page_83[0] & 0xf0);
1295 vpd->protocol_identifier_set = 1;
1296 transport_dump_vpd_proto_id(vpd, NULL, 0);
1297 }
1298}
1299EXPORT_SYMBOL(transport_set_vpd_proto_id);
1300
1301int transport_dump_vpd_assoc(
1302 struct t10_vpd *vpd,
1303 unsigned char *p_buf,
1304 int p_buf_len)
1305{
1306 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1307 int ret = 0;
1308 int len;
c66ac9db
NB		 1309
1310 memset(buf, 0, VPD_TMP_BUF_SIZE);
1311 len = sprintf(buf, "T10 VPD Identifier Association: ");
1312
1313 switch (vpd->association) {
1314 case 0x00:
1315 sprintf(buf+len, "addressed logical unit\n");
1316 break;
1317 case 0x10:
1318 sprintf(buf+len, "target port\n");
1319 break;
1320 case 0x20:
1321 sprintf(buf+len, "SCSI target device\n");
1322 break;
1323 default:
1324 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1325 ret = -EINVAL;
c66ac9db
NB		 1326 break;
1327 }
1328
1329 if (p_buf)
1330 strncpy(p_buf, buf, p_buf_len);
1331 else
1332 printk("%s", buf);
1333
1334 return ret;
1335}
1336
1337int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1338{
1339 /*
1340 * The VPD identification association..
1341 *
1342 * from spc3r23.pdf Section 7.6.3.1 Table 297
1343 */
1344 vpd->association = (page_83[1] & 0x30);
1345 return transport_dump_vpd_assoc(vpd, NULL, 0);
1346}
1347EXPORT_SYMBOL(transport_set_vpd_assoc);
1348
1349int transport_dump_vpd_ident_type(
1350 struct t10_vpd *vpd,
1351 unsigned char *p_buf,
1352 int p_buf_len)
1353{
1354 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1355 int ret = 0;
1356 int len;
c66ac9db
NB		 1357
1358 memset(buf, 0, VPD_TMP_BUF_SIZE);
1359 len = sprintf(buf, "T10 VPD Identifier Type: ");
1360
1361 switch (vpd->device_identifier_type) {
1362 case 0x00:
1363 sprintf(buf+len, "Vendor specific\n");
1364 break;
1365 case 0x01:
1366 sprintf(buf+len, "T10 Vendor ID based\n");
1367 break;
1368 case 0x02:
1369 sprintf(buf+len, "EUI-64 based\n");
1370 break;
1371 case 0x03:
1372 sprintf(buf+len, "NAA\n");
1373 break;
1374 case 0x04:
1375 sprintf(buf+len, "Relative target port identifier\n");
1376 break;
1377 case 0x08:
1378 sprintf(buf+len, "SCSI name string\n");
1379 break;
1380 default:
1381 sprintf(buf+len, "Unsupported: 0x%02x\n",
1382 vpd->device_identifier_type);
e3d6f909 1383 ret = -EINVAL;
c66ac9db
NB		 1384 break;
1385 }
1386
e3d6f909
AG		 1387 if (p_buf) {
1388 if (p_buf_len < strlen(buf)+1)
1389 return -EINVAL;
c66ac9db 1390 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1391 } else {
c66ac9db 1392 printk("%s", buf);
e3d6f909 1393 }
c66ac9db
NB		 1394
1395 return ret;
1396}
1397
1398int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1399{
1400 /*
1401 * The VPD identifier type..
1402 *
1403 * from spc3r23.pdf Section 7.6.3.1 Table 298
1404 */
1405 vpd->device_identifier_type = (page_83[1] & 0x0f);
1406 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1407}
1408EXPORT_SYMBOL(transport_set_vpd_ident_type);
1409
1410int transport_dump_vpd_ident(
1411 struct t10_vpd *vpd,
1412 unsigned char *p_buf,
1413 int p_buf_len)
1414{
1415 unsigned char buf[VPD_TMP_BUF_SIZE];
1416 int ret = 0;
1417
1418 memset(buf, 0, VPD_TMP_BUF_SIZE);
1419
1420 switch (vpd->device_identifier_code_set) {
1421 case 0x01: /* Binary */
1422 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1423 &vpd->device_identifier[0]);
1424 break;
1425 case 0x02: /* ASCII */
1426 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1427 &vpd->device_identifier[0]);
1428 break;
1429 case 0x03: /* UTF-8 */
1430 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1431 &vpd->device_identifier[0]);
1432 break;
1433 default:
1434 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1435 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1436 ret = -EINVAL;
c66ac9db
NB		 1437 break;
1438 }
1439
1440 if (p_buf)
1441 strncpy(p_buf, buf, p_buf_len);
1442 else
1443 printk("%s", buf);
1444
1445 return ret;
1446}
1447
1448int
1449transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1450{
1451 static const char hex_str[] = "0123456789abcdef";
1452 int j = 0, i = 4; /* offset to start of the identifer */
1453
1454 /*
1455 * The VPD Code Set (encoding)
1456 *
1457 * from spc3r23.pdf Section 7.6.3.1 Table 296
1458 */
1459 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1460 switch (vpd->device_identifier_code_set) {
1461 case 0x01: /* Binary */
1462 vpd->device_identifier[j++] =
1463 hex_str[vpd->device_identifier_type];
1464 while (i < (4 + page_83[3])) {
1465 vpd->device_identifier[j++] =
1466 hex_str[(page_83[i] & 0xf0) >> 4];
1467 vpd->device_identifier[j++] =
1468 hex_str[page_83[i] & 0x0f];
1469 i++;
1470 }
1471 break;
1472 case 0x02: /* ASCII */
1473 case 0x03: /* UTF-8 */
1474 while (i < (4 + page_83[3]))
1475 vpd->device_identifier[j++] = page_83[i++];
1476 break;
1477 default:
1478 break;
1479 }
1480
1481 return transport_dump_vpd_ident(vpd, NULL, 0);
1482}
1483EXPORT_SYMBOL(transport_set_vpd_ident);
1484
1485static void core_setup_task_attr_emulation(struct se_device *dev)
1486{
1487 /*
1488 * If this device is from Target_Core_Mod/pSCSI, disable the
1489 * SAM Task Attribute emulation.
1490 *
1491 * This is currently not available in upsream Linux/SCSI Target
1492 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1493 */
e3d6f909 1494 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1495 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1496 return;
1497 }
1498
1499 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1500 DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1501 " device\n", dev->transport->name,
1502 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1503}
1504
1505static void scsi_dump_inquiry(struct se_device *dev)
1506{
e3d6f909 1507 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1508 int i, device_type;
1509 /*
1510 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1511 */
1512 printk(" Vendor: ");
1513 for (i = 0; i < 8; i++)
1514 if (wwn->vendor[i] >= 0x20)
1515 printk("%c", wwn->vendor[i]);
1516 else
1517 printk(" ");
1518
1519 printk(" Model: ");
1520 for (i = 0; i < 16; i++)
1521 if (wwn->model[i] >= 0x20)
1522 printk("%c", wwn->model[i]);
1523 else
1524 printk(" ");
1525
1526 printk(" Revision: ");
1527 for (i = 0; i < 4; i++)
1528 if (wwn->revision[i] >= 0x20)
1529 printk("%c", wwn->revision[i]);
1530 else
1531 printk(" ");
1532
1533 printk("\n");
1534
e3d6f909 1535 device_type = dev->transport->get_device_type(dev);
c66ac9db
NB		 1536 printk(" Type: %s ", scsi_device_type(device_type));
1537 printk(" ANSI SCSI revision: %02x\n",
e3d6f909 1538 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1539}
1540
1541struct se_device *transport_add_device_to_core_hba(
1542 struct se_hba *hba,
1543 struct se_subsystem_api *transport,
1544 struct se_subsystem_dev *se_dev,
1545 u32 device_flags,
1546 void *transport_dev,
1547 struct se_dev_limits *dev_limits,
1548 const char *inquiry_prod,
1549 const char *inquiry_rev)
1550{
12a18bdc 1551 int force_pt;
c66ac9db
NB		 1552 struct se_device *dev;
1553
1554 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1555 if (!(dev)) {
1556 printk(KERN_ERR "Unable to allocate memory for se_dev_t\n");
1557 return NULL;
1558 }
c66ac9db 1559
e3d6f909 1560 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1561 dev->dev_flags = device_flags;
1562 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1563 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1564 dev->se_hba = hba;
1565 dev->se_sub_dev = se_dev;
1566 dev->transport = transport;
1567 atomic_set(&dev->active_cmds, 0);
1568 INIT_LIST_HEAD(&dev->dev_list);
1569 INIT_LIST_HEAD(&dev->dev_sep_list);
1570 INIT_LIST_HEAD(&dev->dev_tmr_list);
1571 INIT_LIST_HEAD(&dev->execute_task_list);
1572 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1573 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1574 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1575 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1576 spin_lock_init(&dev->execute_task_lock);
1577 spin_lock_init(&dev->delayed_cmd_lock);
1578 spin_lock_init(&dev->ordered_cmd_lock);
1579 spin_lock_init(&dev->state_task_lock);
1580 spin_lock_init(&dev->dev_alua_lock);
1581 spin_lock_init(&dev->dev_reservation_lock);
1582 spin_lock_init(&dev->dev_status_lock);
1583 spin_lock_init(&dev->dev_status_thr_lock);
1584 spin_lock_init(&dev->se_port_lock);
1585 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1586 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1587
1588 dev->queue_depth = dev_limits->queue_depth;
1589 atomic_set(&dev->depth_left, dev->queue_depth);
1590 atomic_set(&dev->dev_ordered_id, 0);
1591
1592 se_dev_set_default_attribs(dev, dev_limits);
1593
1594 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1595 dev->creation_time = get_jiffies_64();
1596 spin_lock_init(&dev->stats_lock);
1597
1598 spin_lock(&hba->device_lock);
1599 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1600 hba->dev_count++;
1601 spin_unlock(&hba->device_lock);
1602 /*
1603 * Setup the SAM Task Attribute emulation for struct se_device
1604 */
1605 core_setup_task_attr_emulation(dev);
1606 /*
1607 * Force PR and ALUA passthrough emulation with internal object use.
1608 */
1609 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1610 /*
1611 * Setup the Reservations infrastructure for struct se_device
1612 */
1613 core_setup_reservations(dev, force_pt);
1614 /*
1615 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1616 */
1617 if (core_setup_alua(dev, force_pt) < 0)
1618 goto out;
1619
1620 /*
1621 * Startup the struct se_device processing thread
1622 */
1623 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1624 "LIO_%s", dev->transport->name);
c66ac9db
NB		 1625 if (IS_ERR(dev->process_thread)) {
1626 printk(KERN_ERR "Unable to create kthread: LIO_%s\n",
e3d6f909 1627 dev->transport->name);
c66ac9db
NB		 1628 goto out;
1629 }
07bde79a
NB		 1630 /*
1631 * Setup work_queue for QUEUE_FULL
1632 */
1633 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1634 /*
1635 * Preload the initial INQUIRY const values if we are doing
1636 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1637 * passthrough because this is being provided by the backend LLD.
1638 * This is required so that transport_get_inquiry() copies these
1639 * originals once back into DEV_T10_WWN(dev) for the virtual device
1640 * setup.
1641 */
e3d6f909 1642 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1643 if (!inquiry_prod || !inquiry_rev) {
c66ac9db
NB		 1644 printk(KERN_ERR "All non TCM/pSCSI plugins require"
1645 " INQUIRY consts\n");
1646 goto out;
1647 }
1648
e3d6f909
AG		 1649 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1650 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1651 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1652 }
1653 scsi_dump_inquiry(dev);
1654
12a18bdc 1655 return dev;
c66ac9db 1656out:
c66ac9db
NB		 1657 kthread_stop(dev->process_thread);
1658
1659 spin_lock(&hba->device_lock);
1660 list_del(&dev->dev_list);
1661 hba->dev_count--;
1662 spin_unlock(&hba->device_lock);
1663
1664 se_release_vpd_for_dev(dev);
1665
c66ac9db
NB		 1666 kfree(dev);
1667
1668 return NULL;
1669}
1670EXPORT_SYMBOL(transport_add_device_to_core_hba);
1671
1672/* transport_generic_prepare_cdb():
1673 *
1674 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1675 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1676 * The point of this is since we are mapping iSCSI LUNs to
1677 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1678 * devices and HBAs for a loop.
1679 */
1680static inline void transport_generic_prepare_cdb(
1681 unsigned char *cdb)
1682{
1683 switch (cdb[0]) {
1684 case READ_10: /* SBC - RDProtect */
1685 case READ_12: /* SBC - RDProtect */
1686 case READ_16: /* SBC - RDProtect */
1687 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1688 case VERIFY: /* SBC - VRProtect */
1689 case VERIFY_16: /* SBC - VRProtect */
1690 case WRITE_VERIFY: /* SBC - VRProtect */
1691 case WRITE_VERIFY_12: /* SBC - VRProtect */
1692 break;
1693 default:
1694 cdb[1] &= 0x1f; /* clear logical unit number */
1695 break;
1696 }
1697}
1698
1699static struct se_task *
1700transport_generic_get_task(struct se_cmd *cmd,
1701 enum dma_data_direction data_direction)
1702{
1703 struct se_task *task;
5951146d 1704 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1705 unsigned long flags;
1706
1707 task = dev->transport->alloc_task(cmd);
1708 if (!task) {
1709 printk(KERN_ERR "Unable to allocate struct se_task\n");
1710 return NULL;
1711 }
1712
1713 INIT_LIST_HEAD(&task->t_list);
1714 INIT_LIST_HEAD(&task->t_execute_list);
1715 INIT_LIST_HEAD(&task->t_state_list);
1716 init_completion(&task->task_stop_comp);
c66ac9db
NB		 1717 task->task_se_cmd = cmd;
1718 task->se_dev = dev;
1719 task->task_data_direction = data_direction;
1720
a1d8b49a
AG		 1721 spin_lock_irqsave(&cmd->t_state_lock, flags);
1722 list_add_tail(&task->t_list, &cmd->t_task_list);
1723 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1724
1725 return task;
1726}
1727
1728static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1729
c66ac9db
NB		 1730/*
1731 * Used by fabric modules containing a local struct se_cmd within their
1732 * fabric dependent per I/O descriptor.
1733 */
1734void transport_init_se_cmd(
1735 struct se_cmd *cmd,
1736 struct target_core_fabric_ops *tfo,
1737 struct se_session *se_sess,
1738 u32 data_length,
1739 int data_direction,
1740 int task_attr,
1741 unsigned char *sense_buffer)
1742{
5951146d
AG		 1743 INIT_LIST_HEAD(&cmd->se_lun_node);
1744 INIT_LIST_HEAD(&cmd->se_delayed_node);
1745 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1746 INIT_LIST_HEAD(&cmd->se_qf_node);
c66ac9db 1747
a1d8b49a
AG		 1748 INIT_LIST_HEAD(&cmd->t_mem_list);
1749 INIT_LIST_HEAD(&cmd->t_mem_bidi_list);
1750 INIT_LIST_HEAD(&cmd->t_task_list);
1751 init_completion(&cmd->transport_lun_fe_stop_comp);
1752 init_completion(&cmd->transport_lun_stop_comp);
1753 init_completion(&cmd->t_transport_stop_comp);
1754 spin_lock_init(&cmd->t_state_lock);
1755 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1756
1757 cmd->se_tfo = tfo;
1758 cmd->se_sess = se_sess;
1759 cmd->data_length = data_length;
1760 cmd->data_direction = data_direction;
1761 cmd->sam_task_attr = task_attr;
1762 cmd->sense_buffer = sense_buffer;
1763}
1764EXPORT_SYMBOL(transport_init_se_cmd);
1765
1766static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1767{
1768 /*
1769 * Check if SAM Task Attribute emulation is enabled for this
1770 * struct se_device storage object
1771 */
5951146d 1772 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1773 return 0;
1774
e66ecd50 1775 if (cmd->sam_task_attr == MSG_ACA_TAG) {
c66ac9db
NB		 1776 DEBUG_STA("SAM Task Attribute ACA"
1777 " emulation is not supported\n");
e3d6f909 1778 return -EINVAL;
c66ac9db
NB		 1779 }
1780 /*
1781 * Used to determine when ORDERED commands should go from
1782 * Dormant to Active status.
1783 */
5951146d 1784 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db
NB		 1785 smp_mb__after_atomic_inc();
1786 DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1787 cmd->se_ordered_id, cmd->sam_task_attr,
1788 TRANSPORT(cmd->se_dev)->name);
1789 return 0;
1790}
1791
1792void transport_free_se_cmd(
1793 struct se_cmd *se_cmd)
1794{
1795 if (se_cmd->se_tmr_req)
1796 core_tmr_release_req(se_cmd->se_tmr_req);
1797 /*
1798 * Check and free any extended CDB buffer that was allocated
1799 */
a1d8b49a
AG		 1800 if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
1801 kfree(se_cmd->t_task_cdb);
c66ac9db
NB		 1802}
1803EXPORT_SYMBOL(transport_free_se_cmd);
1804
1805static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1806
1807/* transport_generic_allocate_tasks():
1808 *
1809 * Called from fabric RX Thread.
1810 */
1811int transport_generic_allocate_tasks(
1812 struct se_cmd *cmd,
1813 unsigned char *cdb)
1814{
1815 int ret;
1816
1817 transport_generic_prepare_cdb(cdb);
1818
1819 /*
1820 * This is needed for early exceptions.
1821 */
1822 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1823
c66ac9db
NB		 1824 /*
1825 * Ensure that the received CDB is less than the max (252 + 8) bytes
1826 * for VARIABLE_LENGTH_CMD
1827 */
1828 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1829 printk(KERN_ERR "Received SCSI CDB with command_size: %d that"
1830 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1831 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1832 return -EINVAL;
c66ac9db
NB		 1833 }
1834 /*
1835 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1836 * allocate the additional extended CDB buffer now.. Otherwise
1837 * setup the pointer from __t_task_cdb to t_task_cdb.
1838 */
a1d8b49a
AG		 1839 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1840 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1841 GFP_KERNEL);
a1d8b49a
AG		 1842 if (!(cmd->t_task_cdb)) {
1843 printk(KERN_ERR "Unable to allocate cmd->t_task_cdb"
1844 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1845 scsi_command_size(cdb),
a1d8b49a 1846 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1847 return -ENOMEM;
c66ac9db
NB		 1848 }
1849 } else
a1d8b49a 1850 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1851 /*
a1d8b49a 1852 * Copy the original CDB into cmd->
c66ac9db 1853 */
a1d8b49a 1854 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1855 /*
1856 * Setup the received CDB based on SCSI defined opcodes and
1857 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1858 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1859 * pointer is expected to be setup before we reach this point.
1860 */
1861 ret = transport_generic_cmd_sequencer(cmd, cdb);
1862 if (ret < 0)
1863 return ret;
1864 /*
1865 * Check for SAM Task Attribute Emulation
1866 */
1867 if (transport_check_alloc_task_attr(cmd) < 0) {
1868 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1869 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1870 return -EINVAL;
c66ac9db
NB		 1871 }
1872 spin_lock(&cmd->se_lun->lun_sep_lock);
1873 if (cmd->se_lun->lun_sep)
1874 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1875 spin_unlock(&cmd->se_lun->lun_sep_lock);
1876 return 0;
1877}
1878EXPORT_SYMBOL(transport_generic_allocate_tasks);
1879
1880/*
1881 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1882 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1883 */
1884int transport_generic_handle_cdb(
1885 struct se_cmd *cmd)
1886{
e3d6f909 1887 if (!cmd->se_lun) {
c66ac9db 1888 dump_stack();
e3d6f909
AG		 1889 printk(KERN_ERR "cmd->se_lun is NULL\n");
1890 return -EINVAL;
c66ac9db 1891 }
695434e1 1892
c66ac9db
NB		 1893 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1894 return 0;
1895}
1896EXPORT_SYMBOL(transport_generic_handle_cdb);
1897
695434e1
NB		 1898/*
1899 * Used by fabric module frontends to queue tasks directly.
1900 * Many only be used from process context only
1901 */
1902int transport_handle_cdb_direct(
1903 struct se_cmd *cmd)
1904{
1905 if (!cmd->se_lun) {
1906 dump_stack();
1907 printk(KERN_ERR "cmd->se_lun is NULL\n");
1908 return -EINVAL;
1909 }
1910 if (in_interrupt()) {
1911 dump_stack();
1912 printk(KERN_ERR "transport_generic_handle_cdb cannot be called"
1913 " from interrupt context\n");
1914 return -EINVAL;
1915 }
1916
1917 return transport_generic_new_cmd(cmd);
1918}
1919EXPORT_SYMBOL(transport_handle_cdb_direct);
1920
c66ac9db
NB		 1921/*
1922 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1923 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1924 * complete setup in TCM process context w/ TFO->new_cmd_map().
1925 */
1926int transport_generic_handle_cdb_map(
1927 struct se_cmd *cmd)
1928{
e3d6f909 1929 if (!cmd->se_lun) {
c66ac9db 1930 dump_stack();
e3d6f909
AG		 1931 printk(KERN_ERR "cmd->se_lun is NULL\n");
1932 return -EINVAL;
c66ac9db
NB		 1933 }
1934
1935 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1936 return 0;
1937}
1938EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1939
1940/* transport_generic_handle_data():
1941 *
1942 *
1943 */
1944int transport_generic_handle_data(
1945 struct se_cmd *cmd)
1946{
1947 /*
1948 * For the software fabric case, then we assume the nexus is being
1949 * failed/shutdown when signals are pending from the kthread context
1950 * caller, so we return a failure. For the HW target mode case running
1951 * in interrupt code, the signal_pending() check is skipped.
1952 */
1953 if (!in_interrupt() && signal_pending(current))
e3d6f909 1954 return -EPERM;
c66ac9db
NB		 1955 /*
1956 * If the received CDB has aleady been ABORTED by the generic
1957 * target engine, we now call transport_check_aborted_status()
1958 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1959 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1960 * sequences at this point.
1961 */
1962 if (transport_check_aborted_status(cmd, 1) != 0)
1963 return 0;
1964
1965 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1966 return 0;
1967}
1968EXPORT_SYMBOL(transport_generic_handle_data);
1969
1970/* transport_generic_handle_tmr():
1971 *
1972 *
1973 */
1974int transport_generic_handle_tmr(
1975 struct se_cmd *cmd)
1976{
1977 /*
1978 * This is needed for early exceptions.
1979 */
1980 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
c66ac9db
NB		 1981
1982 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1983 return 0;
1984}
1985EXPORT_SYMBOL(transport_generic_handle_tmr);
1986
f4366772
NB		 1987void transport_generic_free_cmd_intr(
1988 struct se_cmd *cmd)
1989{
1990 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1991}
1992EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1993
c66ac9db
NB		 1994static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1995{
1996 struct se_task *task, *task_tmp;
1997 unsigned long flags;
1998 int ret = 0;
1999
2000 DEBUG_TS("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 2001 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2002
2003 /*
2004 * No tasks remain in the execution queue
2005 */
a1d8b49a 2006 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2007 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2008 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2009 DEBUG_TS("task_no[%d] - Processing task %p\n",
2010 task->task_no, task);
2011 /*
2012 * If the struct se_task has not been sent and is not active,
2013 * remove the struct se_task from the execution queue.
2014 */
2015 if (!atomic_read(&task->task_sent) &&
2016 !atomic_read(&task->task_active)) {
a1d8b49a 2017 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 2018 flags);
2019 transport_remove_task_from_execute_queue(task,
2020 task->se_dev);
2021
2022 DEBUG_TS("task_no[%d] - Removed from execute queue\n",
2023 task->task_no);
a1d8b49a 2024 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2025 continue;
2026 }
2027
2028 /*
2029 * If the struct se_task is active, sleep until it is returned
2030 * from the plugin.
2031 */
2032 if (atomic_read(&task->task_active)) {
2033 atomic_set(&task->task_stop, 1);
a1d8b49a 2034 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 2035 flags);
2036
2037 DEBUG_TS("task_no[%d] - Waiting to complete\n",
2038 task->task_no);
2039 wait_for_completion(&task->task_stop_comp);
2040 DEBUG_TS("task_no[%d] - Stopped successfully\n",
2041 task->task_no);
2042
a1d8b49a
AG		 2043 spin_lock_irqsave(&cmd->t_state_lock, flags);
2044 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 2045
2046 atomic_set(&task->task_active, 0);
2047 atomic_set(&task->task_stop, 0);
2048 } else {
2049 DEBUG_TS("task_no[%d] - Did nothing\n", task->task_no);
2050 ret++;
2051 }
2052
2053 __transport_stop_task_timer(task, &flags);
2054 }
a1d8b49a 2055 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2056
2057 return ret;
2058}
2059
c66ac9db
NB		 2060/*
2061 * Handle SAM-esque emulation for generic transport request failures.
2062 */
2063static void transport_generic_request_failure(
2064 struct se_cmd *cmd,
2065 struct se_device *dev,
2066 int complete,
2067 int sc)
2068{
07bde79a
NB		 2069 int ret = 0;
2070
c66ac9db 2071 DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 2072 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 2073 cmd->t_task_cdb[0]);
c66ac9db
NB		 2074 DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:"
2075 " %d/%d transport_error_status: %d\n",
e3d6f909 2076 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 2077 cmd->t_state, cmd->deferred_t_state,
2078 cmd->transport_error_status);
2079 DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d"
2080 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
2081 " t_transport_active: %d t_transport_stop: %d"
a1d8b49a
AG		 2082 " t_transport_sent: %d\n", cmd->t_task_cdbs,
2083 atomic_read(&cmd->t_task_cdbs_left),
2084 atomic_read(&cmd->t_task_cdbs_sent),
2085 atomic_read(&cmd->t_task_cdbs_ex_left),
2086 atomic_read(&cmd->t_transport_active),
2087 atomic_read(&cmd->t_transport_stop),
2088 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 2089
2090 transport_stop_all_task_timers(cmd);
2091
2092 if (dev)
e3d6f909 2093 atomic_inc(&dev->depth_left);
c66ac9db
NB		 2094 /*
2095 * For SAM Task Attribute emulation for failed struct se_cmd
2096 */
2097 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2098 transport_complete_task_attr(cmd);
2099
2100 if (complete) {
2101 transport_direct_request_timeout(cmd);
2102 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2103 }
2104
2105 switch (cmd->transport_error_status) {
2106 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
2107 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2108 break;
2109 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
2110 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
2111 break;
2112 case PYX_TRANSPORT_INVALID_CDB_FIELD:
2113 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2114 break;
2115 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
2116 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2117 break;
2118 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
2119 if (!sc)
2120 transport_new_cmd_failure(cmd);
2121 /*
2122 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2123 * we force this session to fall back to session
2124 * recovery.
2125 */
e3d6f909
AG		 2126 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
2127 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 2128
2129 goto check_stop;
2130 case PYX_TRANSPORT_LU_COMM_FAILURE:
2131 case PYX_TRANSPORT_ILLEGAL_REQUEST:
2132 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2133 break;
2134 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
2135 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
2136 break;
2137 case PYX_TRANSPORT_WRITE_PROTECTED:
2138 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
2139 break;
2140 case PYX_TRANSPORT_RESERVATION_CONFLICT:
2141 /*
2142 * No SENSE Data payload for this case, set SCSI Status
2143 * and queue the response to $FABRIC_MOD.
2144 *
2145 * Uses linux/include/scsi/scsi.h SAM status codes defs
2146 */
2147 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2148 /*
2149 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2150 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2151 * CONFLICT STATUS.
2152 *
2153 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2154 */
e3d6f909
AG		 2155 if (cmd->se_sess &&
2156 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2157 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2158 cmd->orig_fe_lun, 0x2C,
2159 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2160
07bde79a
NB		 2161 ret = cmd->se_tfo->queue_status(cmd);
2162 if (ret == -EAGAIN)
2163 goto queue_full;
c66ac9db
NB		 2164 goto check_stop;
2165 case PYX_TRANSPORT_USE_SENSE_REASON:
2166 /*
2167 * struct se_cmd->scsi_sense_reason already set
2168 */
2169 break;
2170 default:
2171 printk(KERN_ERR "Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 2172 cmd->t_task_cdb[0],
c66ac9db
NB		 2173 cmd->transport_error_status);
2174 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2175 break;
2176 }
2177
2178 if (!sc)
2179 transport_new_cmd_failure(cmd);
07bde79a
NB		 2180 else {
2181 ret = transport_send_check_condition_and_sense(cmd,
2182 cmd->scsi_sense_reason, 0);
2183 if (ret == -EAGAIN)
2184 goto queue_full;
2185 }
2186
c66ac9db
NB		 2187check_stop:
2188 transport_lun_remove_cmd(cmd);
2189 if (!(transport_cmd_check_stop_to_fabric(cmd)))
2190 ;
07bde79a
NB		 2191 return;
2192
2193queue_full:
2194 cmd->t_state = TRANSPORT_COMPLETE_OK;
2195 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 2196}
2197
2198static void transport_direct_request_timeout(struct se_cmd *cmd)
2199{
2200 unsigned long flags;
2201
a1d8b49a
AG		 2202 spin_lock_irqsave(&cmd->t_state_lock, flags);
2203 if (!(atomic_read(&cmd->t_transport_timeout))) {
2204 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2205 return;
2206 }
a1d8b49a
AG		 2207 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2208 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2209 return;
2210 }
2211
a1d8b49a
AG		 2212 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2213 &cmd->t_se_count);
2214 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2215}
2216
2217static void transport_generic_request_timeout(struct se_cmd *cmd)
2218{
2219 unsigned long flags;
2220
2221 /*
a1d8b49a 2222 * Reset cmd->t_se_count to allow transport_generic_remove()
c66ac9db
NB		 2223 * to allow last call to free memory resources.
2224 */
a1d8b49a
AG		 2225 spin_lock_irqsave(&cmd->t_state_lock, flags);
2226 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2227 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2228
a1d8b49a 2229 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2230 }
a1d8b49a 2231 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2232
35462975 2233 transport_generic_remove(cmd, 0);
c66ac9db
NB		 2234}
2235
c66ac9db
NB		 2236static inline u32 transport_lba_21(unsigned char *cdb)
2237{
2238 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2239}
2240
2241static inline u32 transport_lba_32(unsigned char *cdb)
2242{
2243 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2244}
2245
2246static inline unsigned long long transport_lba_64(unsigned char *cdb)
2247{
2248 unsigned int __v1, __v2;
2249
2250 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2251 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2252
2253 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2254}
2255
2256/*
2257 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2258 */
2259static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2260{
2261 unsigned int __v1, __v2;
2262
2263 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2264 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2265
2266 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2267}
2268
2269static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2270{
2271 unsigned long flags;
2272
a1d8b49a 2273 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2274 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2275 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2276}
2277
2278/*
2279 * Called from interrupt context.
2280 */
2281static void transport_task_timeout_handler(unsigned long data)
2282{
2283 struct se_task *task = (struct se_task *)data;
e3d6f909 2284 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2285 unsigned long flags;
2286
2287 DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2288
a1d8b49a 2289 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2290 if (task->task_flags & TF_STOP) {
a1d8b49a 2291 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2292 return;
2293 }
2294 task->task_flags &= ~TF_RUNNING;
2295
2296 /*
2297 * Determine if transport_complete_task() has already been called.
2298 */
2299 if (!(atomic_read(&task->task_active))) {
2300 DEBUG_TT("transport task: %p cmd: %p timeout task_active"
2301 " == 0\n", task, cmd);
a1d8b49a 2302 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2303 return;
2304 }
2305
a1d8b49a
AG		 2306 atomic_inc(&cmd->t_se_count);
2307 atomic_inc(&cmd->t_transport_timeout);
2308 cmd->t_tasks_failed = 1;
c66ac9db
NB		 2309
2310 atomic_set(&task->task_timeout, 1);
2311 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2312 task->task_scsi_status = 1;
2313
2314 if (atomic_read(&task->task_stop)) {
2315 DEBUG_TT("transport task: %p cmd: %p timeout task_stop"
2316 " == 1\n", task, cmd);
a1d8b49a 2317 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2318 complete(&task->task_stop_comp);
2319 return;
2320 }
2321
a1d8b49a 2322 if (!(atomic_dec_and_test(&cmd->t_task_cdbs_left))) {
c66ac9db
NB		 2323 DEBUG_TT("transport task: %p cmd: %p timeout non zero"
2324 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2325 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2326 return;
2327 }
2328 DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2329 task, cmd);
2330
2331 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2332 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2333
2334 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2335}
2336
2337/*
a1d8b49a 2338 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2339 */
2340static void transport_start_task_timer(struct se_task *task)
2341{
2342 struct se_device *dev = task->se_dev;
2343 int timeout;
2344
2345 if (task->task_flags & TF_RUNNING)
2346 return;
2347 /*
2348 * If the task_timeout is disabled, exit now.
2349 */
e3d6f909 2350 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
c66ac9db
NB		 2351 if (!(timeout))
2352 return;
2353
2354 init_timer(&task->task_timer);
2355 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2356 task->task_timer.data = (unsigned long) task;
2357 task->task_timer.function = transport_task_timeout_handler;
2358
2359 task->task_flags |= TF_RUNNING;
2360 add_timer(&task->task_timer);
2361#if 0
2362 printk(KERN_INFO "Starting task timer for cmd: %p task: %p seconds:"
2363 " %d\n", task->task_se_cmd, task, timeout);
2364#endif
2365}
2366
2367/*
a1d8b49a 2368 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2369 */
2370void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2371{
e3d6f909 2372 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2373
2374 if (!(task->task_flags & TF_RUNNING))
2375 return;
2376
2377 task->task_flags |= TF_STOP;
a1d8b49a 2378 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2379
2380 del_timer_sync(&task->task_timer);
2381
a1d8b49a 2382 spin_lock_irqsave(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2383 task->task_flags &= ~TF_RUNNING;
2384 task->task_flags &= ~TF_STOP;
2385}
2386
2387static void transport_stop_all_task_timers(struct se_cmd *cmd)
2388{
2389 struct se_task *task = NULL, *task_tmp;
2390 unsigned long flags;
2391
a1d8b49a 2392 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2393 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2394 &cmd->t_task_list, t_list)
c66ac9db 2395 __transport_stop_task_timer(task, &flags);
a1d8b49a 2396 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2397}
2398
2399static inline int transport_tcq_window_closed(struct se_device *dev)
2400{
2401 if (dev->dev_tcq_window_closed++ <
2402 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2403 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2404 } else
2405 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2406
e3d6f909 2407 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2408 return 0;
2409}
2410
2411/*
2412 * Called from Fabric Module context from transport_execute_tasks()
2413 *
2414 * The return of this function determins if the tasks from struct se_cmd
2415 * get added to the execution queue in transport_execute_tasks(),
2416 * or are added to the delayed or ordered lists here.
2417 */
2418static inline int transport_execute_task_attr(struct se_cmd *cmd)
2419{
5951146d 2420 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2421 return 1;
2422 /*
25985edc 2423 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2424 * to allow the passed struct se_cmd list of tasks to the front of the list.
2425 */
e66ecd50 2426 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2427 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db
NB		 2428 smp_mb__after_atomic_inc();
2429 DEBUG_STA("Added HEAD_OF_QUEUE for CDB:"
2430 " 0x%02x, se_ordered_id: %u\n",
a1d8b49a 2431 cmd->_task_cdb[0],
c66ac9db
NB		 2432 cmd->se_ordered_id);
2433 return 1;
e66ecd50 2434 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2435 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2436 list_add_tail(&cmd->se_ordered_node,
2437 &cmd->se_dev->ordered_cmd_list);
2438 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2439
5951146d 2440 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2441 smp_mb__after_atomic_inc();
2442
2443 DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered"
2444 " list, se_ordered_id: %u\n",
a1d8b49a 2445 cmd->t_task_cdb[0],
c66ac9db
NB		 2446 cmd->se_ordered_id);
2447 /*
2448 * Add ORDERED command to tail of execution queue if
2449 * no other older commands exist that need to be
2450 * completed first.
2451 */
5951146d 2452 if (!(atomic_read(&cmd->se_dev->simple_cmds)))
c66ac9db
NB		 2453 return 1;
2454 } else {
2455 /*
2456 * For SIMPLE and UNTAGGED Task Attribute commands
2457 */
5951146d 2458 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2459 smp_mb__after_atomic_inc();
2460 }
2461 /*
2462 * Otherwise if one or more outstanding ORDERED task attribute exist,
2463 * add the dormant task(s) built for the passed struct se_cmd to the
2464 * execution queue and become in Active state for this struct se_device.
2465 */
5951146d 2466 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2467 /*
2468 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2469 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2470 */
5951146d 2471 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2472 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2473 list_add_tail(&cmd->se_delayed_node,
2474 &cmd->se_dev->delayed_cmd_list);
2475 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db
NB		 2476
2477 DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to"
2478 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2479 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2480 cmd->se_ordered_id);
2481 /*
2482 * Return zero to let transport_execute_tasks() know
2483 * not to add the delayed tasks to the execution list.
2484 */
2485 return 0;
2486 }
2487 /*
2488 * Otherwise, no ORDERED task attributes exist..
2489 */
2490 return 1;
2491}
2492
2493/*
2494 * Called from fabric module context in transport_generic_new_cmd() and
2495 * transport_generic_process_write()
2496 */
2497static int transport_execute_tasks(struct se_cmd *cmd)
2498{
2499 int add_tasks;
2500
db1620a2
CH		 2501 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2502 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2503 transport_generic_request_failure(cmd, NULL, 0, 1);
2504 return 0;
c66ac9db 2505 }
db1620a2 2506
c66ac9db
NB		 2507 /*
2508 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2509 * has occurred that prevents execution.
c66ac9db
NB		 2510 */
2511 if (!(transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))) {
2512 /*
2513 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2514 * attribute for the tasks of the received struct se_cmd CDB
2515 */
2516 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2517 if (!add_tasks)
c66ac9db
NB		 2518 goto execute_tasks;
2519 /*
2520 * This calls transport_add_tasks_from_cmd() to handle
2521 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2522 * (if enabled) in __transport_add_task_to_execute_queue() and
2523 * transport_add_task_check_sam_attr().
2524 */
2525 transport_add_tasks_from_cmd(cmd);
2526 }
2527 /*
2528 * Kick the execution queue for the cmd associated struct se_device
2529 * storage object.
2530 */
2531execute_tasks:
5951146d 2532 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2533 return 0;
2534}
2535
2536/*
2537 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2538 * from struct se_device->execute_task_list and
2539 *
2540 * Called from transport_processing_thread()
2541 */
2542static int __transport_execute_tasks(struct se_device *dev)
2543{
2544 int error;
2545 struct se_cmd *cmd = NULL;
e3d6f909 2546 struct se_task *task = NULL;
c66ac9db
NB		 2547 unsigned long flags;
2548
2549 /*
2550 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2551 * struct se_tasks to the selected transport.
c66ac9db
NB		 2552 */
2553check_depth:
e3d6f909 2554 if (!atomic_read(&dev->depth_left))
c66ac9db 2555 return transport_tcq_window_closed(dev);
c66ac9db 2556
e3d6f909 2557 dev->dev_tcq_window_closed = 0;
c66ac9db 2558
e3d6f909
AG		 2559 spin_lock_irq(&dev->execute_task_lock);
2560 if (list_empty(&dev->execute_task_list)) {
2561 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2562 return 0;
2563 }
e3d6f909
AG		 2564 task = list_first_entry(&dev->execute_task_list,
2565 struct se_task, t_execute_list);
2566 list_del(&task->t_execute_list);
2567 atomic_set(&task->task_execute_queue, 0);
2568 atomic_dec(&dev->execute_tasks);
2569 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2570
2571 atomic_dec(&dev->depth_left);
c66ac9db 2572
e3d6f909 2573 cmd = task->task_se_cmd;
c66ac9db 2574
a1d8b49a 2575 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2576 atomic_set(&task->task_active, 1);
2577 atomic_set(&task->task_sent, 1);
a1d8b49a 2578 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2579
a1d8b49a
AG		 2580 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2581 cmd->t_task_list_num)
c66ac9db
NB		 2582 atomic_set(&cmd->transport_sent, 1);
2583
2584 transport_start_task_timer(task);
a1d8b49a 2585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2586 /*
2587 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2588 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2589 * struct se_subsystem_api->do_task() caller below.
2590 */
2591 if (cmd->transport_emulate_cdb) {
2592 error = cmd->transport_emulate_cdb(cmd);
2593 if (error != 0) {
2594 cmd->transport_error_status = error;
2595 atomic_set(&task->task_active, 0);
2596 atomic_set(&cmd->transport_sent, 0);
2597 transport_stop_tasks_for_cmd(cmd);
2598 transport_generic_request_failure(cmd, dev, 0, 1);
2599 goto check_depth;
2600 }
2601 /*
2602 * Handle the successful completion for transport_emulate_cdb()
2603 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2604 * Otherwise the caller is expected to complete the task with
2605 * proper status.
2606 */
2607 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2608 cmd->scsi_status = SAM_STAT_GOOD;
2609 task->task_scsi_status = GOOD;
2610 transport_complete_task(task, 1);
2611 }
2612 } else {
2613 /*
2614 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2615 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2616 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2617 * LUN emulation code.
2618 *
2619 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2620 * call ->do_task() directly and let the underlying TCM subsystem plugin
2621 * code handle the CDB emulation.
2622 */
e3d6f909
AG		 2623 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2624 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2625 error = transport_emulate_control_cdb(task);
2626 else
e3d6f909 2627 error = dev->transport->do_task(task);
c66ac9db
NB		 2628
2629 if (error != 0) {
2630 cmd->transport_error_status = error;
2631 atomic_set(&task->task_active, 0);
2632 atomic_set(&cmd->transport_sent, 0);
2633 transport_stop_tasks_for_cmd(cmd);
2634 transport_generic_request_failure(cmd, dev, 0, 1);
2635 }
2636 }
2637
2638 goto check_depth;
2639
2640 return 0;
2641}
2642
2643void transport_new_cmd_failure(struct se_cmd *se_cmd)
2644{
2645 unsigned long flags;
2646 /*
2647 * Any unsolicited data will get dumped for failed command inside of
2648 * the fabric plugin
2649 */
a1d8b49a 2650 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2651 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2652 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2653 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2654}
2655
2656static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2657
2658static inline u32 transport_get_sectors_6(
2659 unsigned char *cdb,
2660 struct se_cmd *cmd,
2661 int *ret)
2662{
5951146d 2663 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2664
2665 /*
2666 * Assume TYPE_DISK for non struct se_device objects.
2667 * Use 8-bit sector value.
2668 */
2669 if (!dev)
2670 goto type_disk;
2671
2672 /*
2673 * Use 24-bit allocation length for TYPE_TAPE.
2674 */
e3d6f909 2675 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2676 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2677
2678 /*
2679 * Everything else assume TYPE_DISK Sector CDB location.
2680 * Use 8-bit sector value.
2681 */
2682type_disk:
2683 return (u32)cdb[4];
2684}
2685
2686static inline u32 transport_get_sectors_10(
2687 unsigned char *cdb,
2688 struct se_cmd *cmd,
2689 int *ret)
2690{
5951146d 2691 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2692
2693 /*
2694 * Assume TYPE_DISK for non struct se_device objects.
2695 * Use 16-bit sector value.
2696 */
2697 if (!dev)
2698 goto type_disk;
2699
2700 /*
2701 * XXX_10 is not defined in SSC, throw an exception
2702 */
e3d6f909
AG		 2703 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2704 *ret = -EINVAL;
c66ac9db
NB		 2705 return 0;
2706 }
2707
2708 /*
2709 * Everything else assume TYPE_DISK Sector CDB location.
2710 * Use 16-bit sector value.
2711 */
2712type_disk:
2713 return (u32)(cdb[7] << 8) + cdb[8];
2714}
2715
2716static inline u32 transport_get_sectors_12(
2717 unsigned char *cdb,
2718 struct se_cmd *cmd,
2719 int *ret)
2720{
5951146d 2721 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2722
2723 /*
2724 * Assume TYPE_DISK for non struct se_device objects.
2725 * Use 32-bit sector value.
2726 */
2727 if (!dev)
2728 goto type_disk;
2729
2730 /*
2731 * XXX_12 is not defined in SSC, throw an exception
2732 */
e3d6f909
AG		 2733 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2734 *ret = -EINVAL;
c66ac9db
NB		 2735 return 0;
2736 }
2737
2738 /*
2739 * Everything else assume TYPE_DISK Sector CDB location.
2740 * Use 32-bit sector value.
2741 */
2742type_disk:
2743 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2744}
2745
2746static inline u32 transport_get_sectors_16(
2747 unsigned char *cdb,
2748 struct se_cmd *cmd,
2749 int *ret)
2750{
5951146d 2751 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2752
2753 /*
2754 * Assume TYPE_DISK for non struct se_device objects.
2755 * Use 32-bit sector value.
2756 */
2757 if (!dev)
2758 goto type_disk;
2759
2760 /*
2761 * Use 24-bit allocation length for TYPE_TAPE.
2762 */
e3d6f909 2763 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2764 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2765
2766type_disk:
2767 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2768 (cdb[12] << 8) + cdb[13];
2769}
2770
2771/*
2772 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2773 */
2774static inline u32 transport_get_sectors_32(
2775 unsigned char *cdb,
2776 struct se_cmd *cmd,
2777 int *ret)
2778{
2779 /*
2780 * Assume TYPE_DISK for non struct se_device objects.
2781 * Use 32-bit sector value.
2782 */
2783 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2784 (cdb[30] << 8) + cdb[31];
2785
2786}
2787
2788static inline u32 transport_get_size(
2789 u32 sectors,
2790 unsigned char *cdb,
2791 struct se_cmd *cmd)
2792{
5951146d 2793 struct se_device *dev = cmd->se_dev;
c66ac9db 2794
e3d6f909 2795 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2796 if (cdb[1] & 1) { /* sectors */
e3d6f909 2797 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2798 } else /* bytes */
2799 return sectors;
2800 }
2801#if 0
2802 printk(KERN_INFO "Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2803 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2804 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2805 dev->transport->name);
c66ac9db 2806#endif
e3d6f909 2807 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2808}
2809
2810unsigned char transport_asciihex_to_binaryhex(unsigned char val[2])
2811{
2812 unsigned char result = 0;
2813 /*
2814 * MSB
2815 */
2816 if ((val[0] >= 'a') && (val[0] <= 'f'))
2817 result = ((val[0] - 'a' + 10) & 0xf) << 4;
2818 else
2819 if ((val[0] >= 'A') && (val[0] <= 'F'))
2820 result = ((val[0] - 'A' + 10) & 0xf) << 4;
2821 else /* digit */
2822 result = ((val[0] - '0') & 0xf) << 4;
2823 /*
2824 * LSB
2825 */
2826 if ((val[1] >= 'a') && (val[1] <= 'f'))
2827 result |= ((val[1] - 'a' + 10) & 0xf);
2828 else
2829 if ((val[1] >= 'A') && (val[1] <= 'F'))
2830 result |= ((val[1] - 'A' + 10) & 0xf);
2831 else /* digit */
2832 result |= ((val[1] - '0') & 0xf);
2833
2834 return result;
2835}
2836EXPORT_SYMBOL(transport_asciihex_to_binaryhex);
2837
2838static void transport_xor_callback(struct se_cmd *cmd)
2839{
2840 unsigned char *buf, *addr;
2841 struct se_mem *se_mem;
2842 unsigned int offset;
2843 int i;
2844 /*
2845 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2846 *
2847 * 1) read the specified logical block(s);
2848 * 2) transfer logical blocks from the data-out buffer;
2849 * 3) XOR the logical blocks transferred from the data-out buffer with
2850 * the logical blocks read, storing the resulting XOR data in a buffer;
2851 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2852 * blocks transferred from the data-out buffer; and
2853 * 5) transfer the resulting XOR data to the data-in buffer.
2854 */
2855 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2856 if (!(buf)) {
2857 printk(KERN_ERR "Unable to allocate xor_callback buf\n");
2858 return;
2859 }
2860 /*
a1d8b49a 2861 * Copy the scatterlist WRITE buffer located at cmd->t_mem_list
c66ac9db
NB		 2862 * into the locally allocated *buf
2863 */
a1d8b49a
AG		 2864 transport_memcpy_se_mem_read_contig(buf, &cmd->t_mem_list,
2865 cmd->data_length);
c66ac9db
NB		 2866 /*
2867 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2868 * cmd->t_mem_bidi_list
c66ac9db
NB		 2869 */
2870
2871 offset = 0;
a1d8b49a 2872 list_for_each_entry(se_mem, &cmd->t_mem_bidi_list, se_list) {
c66ac9db
NB		 2873 addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0);
2874 if (!(addr))
2875 goto out;
2876
2877 for (i = 0; i < se_mem->se_len; i++)
2878 *(addr + se_mem->se_off + i) ^= *(buf + offset + i);
2879
2880 offset += se_mem->se_len;
2881 kunmap_atomic(addr, KM_USER0);
2882 }
2883out:
2884 kfree(buf);
2885}
2886
2887/*
2888 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2889 */
2890static int transport_get_sense_data(struct se_cmd *cmd)
2891{
2892 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2893 struct se_device *dev;
2894 struct se_task *task = NULL, *task_tmp;
2895 unsigned long flags;
2896 u32 offset = 0;
2897
e3d6f909
AG		 2898 WARN_ON(!cmd->se_lun);
2899
a1d8b49a 2900 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2901 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2902 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2903 return 0;
2904 }
2905
2906 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2907 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2908
2909 if (!task->task_sense)
2910 continue;
2911
2912 dev = task->se_dev;
2913 if (!(dev))
2914 continue;
2915
e3d6f909
AG		 2916 if (!dev->transport->get_sense_buffer) {
2917 printk(KERN_ERR "dev->transport->get_sense_buffer"
c66ac9db
NB		 2918 " is NULL\n");
2919 continue;
2920 }
2921
e3d6f909 2922 sense_buffer = dev->transport->get_sense_buffer(task);
c66ac9db
NB		 2923 if (!(sense_buffer)) {
2924 printk(KERN_ERR "ITT[0x%08x]_TASK[%d]: Unable to locate"
2925 " sense buffer for task with sense\n",
e3d6f909 2926 cmd->se_tfo->get_task_tag(cmd), task->task_no);
c66ac9db
NB		 2927 continue;
2928 }
a1d8b49a 2929 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2930
e3d6f909 2931 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2932 TRANSPORT_SENSE_BUFFER);
2933
5951146d 2934 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2935 TRANSPORT_SENSE_BUFFER);
2936 cmd->scsi_status = task->task_scsi_status;
2937 /* Automatically padded */
2938 cmd->scsi_sense_length =
2939 (TRANSPORT_SENSE_BUFFER + offset);
2940
2941 printk(KERN_INFO "HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2942 " and sense\n",
e3d6f909 2943 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2944 cmd->scsi_status);
2945 return 0;
2946 }
a1d8b49a 2947 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2948
2949 return -1;
2950}
2951
c66ac9db
NB		 2952static int
2953transport_handle_reservation_conflict(struct se_cmd *cmd)
2954{
2955 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2956 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2957 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2958 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2959 /*
2960 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2961 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2962 * CONFLICT STATUS.
2963 *
2964 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2965 */
e3d6f909
AG		 2966 if (cmd->se_sess &&
2967 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2968 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2969 cmd->orig_fe_lun, 0x2C,
2970 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2971 return -EINVAL;
c66ac9db
NB		 2972}
2973
2974/* transport_generic_cmd_sequencer():
2975 *
2976 * Generic Command Sequencer that should work for most DAS transport
2977 * drivers.
2978 *
2979 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2980 * RX Thread.
2981 *
2982 * FIXME: Need to support other SCSI OPCODES where as well.
2983 */
2984static int transport_generic_cmd_sequencer(
2985 struct se_cmd *cmd,
2986 unsigned char *cdb)
2987{
5951146d 2988 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2989 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2990 int ret = 0, sector_ret = 0, passthrough;
2991 u32 sectors = 0, size = 0, pr_reg_type = 0;
2992 u16 service_action;
2993 u8 alua_ascq = 0;
2994 /*
2995 * Check for an existing UNIT ATTENTION condition
2996 */
2997 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2998 cmd->transport_wait_for_tasks =
2999 &transport_nop_wait_for_tasks;
3000 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3001 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 3002 return -EINVAL;
c66ac9db
NB		 3003 }
3004 /*
3005 * Check status of Asymmetric Logical Unit Assignment port
3006 */
e3d6f909 3007 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db
NB		 3008 if (ret != 0) {
3009 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3010 /*
25985edc 3011 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 3012 * The ALUA additional sense code qualifier (ASCQ) is determined
3013 * by the ALUA primary or secondary access state..
3014 */
3015 if (ret > 0) {
3016#if 0
3017 printk(KERN_INFO "[%s]: ALUA TG Port not available,"
3018 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 3019 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 3020#endif
3021 transport_set_sense_codes(cmd, 0x04, alua_ascq);
3022 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3023 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 3024 return -EINVAL;
c66ac9db
NB		 3025 }
3026 goto out_invalid_cdb_field;
3027 }
3028 /*
3029 * Check status for SPC-3 Persistent Reservations
3030 */
e3d6f909
AG		 3031 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
3032 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 3033 cmd, cdb, pr_reg_type) != 0)
3034 return transport_handle_reservation_conflict(cmd);
3035 /*
3036 * This means the CDB is allowed for the SCSI Initiator port
3037 * when said port is *NOT* holding the legacy SPC-2 or
3038 * SPC-3 Persistent Reservation.
3039 */
3040 }
3041
3042 switch (cdb[0]) {
3043 case READ_6:
3044 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
3045 if (sector_ret)
3046 goto out_unsupported_cdb;
3047 size = transport_get_size(sectors, cdb, cmd);
3048 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 3049 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 3050 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3051 break;
3052 case READ_10:
3053 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3054 if (sector_ret)
3055 goto out_unsupported_cdb;
3056 size = transport_get_size(sectors, cdb, cmd);
3057 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 3058 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3059 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3060 break;
3061 case READ_12:
3062 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3063 if (sector_ret)
3064 goto out_unsupported_cdb;
3065 size = transport_get_size(sectors, cdb, cmd);
3066 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a 3067 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3068 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3069 break;
3070 case READ_16:
3071 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3072 if (sector_ret)
3073 goto out_unsupported_cdb;
3074 size = transport_get_size(sectors, cdb, cmd);
3075 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a 3076 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3077 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3078 break;
3079 case WRITE_6:
3080 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
3081 if (sector_ret)
3082 goto out_unsupported_cdb;
3083 size = transport_get_size(sectors, cdb, cmd);
3084 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 3085 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 3086 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3087 break;
3088 case WRITE_10:
3089 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3090 if (sector_ret)
3091 goto out_unsupported_cdb;
3092 size = transport_get_size(sectors, cdb, cmd);
3093 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a
AG		 3094 cmd->t_task_lba = transport_lba_32(cdb);
3095 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3096 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3097 break;
3098 case WRITE_12:
3099 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3100 if (sector_ret)
3101 goto out_unsupported_cdb;
3102 size = transport_get_size(sectors, cdb, cmd);
3103 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a
AG		 3104 cmd->t_task_lba = transport_lba_32(cdb);
3105 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3106 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3107 break;
3108 case WRITE_16:
3109 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3110 if (sector_ret)
3111 goto out_unsupported_cdb;
3112 size = transport_get_size(sectors, cdb, cmd);
3113 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a
AG		 3114 cmd->t_task_lba = transport_lba_64(cdb);
3115 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3116 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3117 break;
3118 case XDWRITEREAD_10:
3119 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 3120 !(cmd->t_tasks_bidi))
c66ac9db
NB		 3121 goto out_invalid_cdb_field;
3122 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3123 if (sector_ret)
3124 goto out_unsupported_cdb;
3125 size = transport_get_size(sectors, cdb, cmd);
3126 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 3127 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 3128 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 3129 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3130 TRANSPORT_PLUGIN_PHBA_PDEV);
3131 /*
3132 * Skip the remaining assignments for TCM/PSCSI passthrough
3133 */
3134 if (passthrough)
3135 break;
3136 /*
3137 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3138 */
3139 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3140 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3141 break;
3142 case VARIABLE_LENGTH_CMD:
3143 service_action = get_unaligned_be16(&cdb[8]);
3144 /*
3145 * Determine if this is TCM/PSCSI device and we should disable
3146 * internal emulation for this CDB.
3147 */
e3d6f909 3148 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3149 TRANSPORT_PLUGIN_PHBA_PDEV);
3150
3151 switch (service_action) {
3152 case XDWRITEREAD_32:
3153 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3154 if (sector_ret)
3155 goto out_unsupported_cdb;
3156 size = transport_get_size(sectors, cdb, cmd);
3157 /*
3158 * Use WRITE_32 and READ_32 opcodes for the emulated
3159 * XDWRITE_READ_32 logic.
3160 */
3161 cmd->transport_split_cdb = &split_cdb_XX_32;
a1d8b49a 3162 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 3163 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3164
3165 /*
3166 * Skip the remaining assignments for TCM/PSCSI passthrough
3167 */
3168 if (passthrough)
3169 break;
3170
3171 /*
3172 * Setup BIDI XOR callback to be run during
3173 * transport_generic_complete_ok()
3174 */
3175 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3176 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 3177 break;
3178 case WRITE_SAME_32:
3179 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3180 if (sector_ret)
3181 goto out_unsupported_cdb;
dd3a5ad8
NB		 3182
3183 if (sectors != 0)
3184 size = transport_get_size(sectors, cdb, cmd);
3185 else
3186 size = dev->se_sub_dev->se_dev_attrib.block_size;
3187
a1d8b49a 3188 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 3189 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3190
3191 /*
3192 * Skip the remaining assignments for TCM/PSCSI passthrough
3193 */
3194 if (passthrough)
3195 break;
3196
3197 if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
3198 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3199 " bits not supported for Block Discard"
3200 " Emulation\n");
3201 goto out_invalid_cdb_field;
3202 }
3203 /*
3204 * Currently for the emulated case we only accept
3205 * tpws with the UNMAP=1 bit set.
3206 */
3207 if (!(cdb[10] & 0x08)) {
3208 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not"
3209 " supported for Block Discard Emulation\n");
3210 goto out_invalid_cdb_field;
3211 }
3212 break;
3213 default:
3214 printk(KERN_ERR "VARIABLE_LENGTH_CMD service action"
3215 " 0x%04x not supported\n", service_action);
3216 goto out_unsupported_cdb;
3217 }
3218 break;
e434f1f1 3219 case MAINTENANCE_IN:
e3d6f909 3220 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3221 /* MAINTENANCE_IN from SCC-2 */
3222 /*
3223 * Check for emulated MI_REPORT_TARGET_PGS.
3224 */
3225 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3226 cmd->transport_emulate_cdb =
e3d6f909 3227 (su_dev->t10_alua.alua_type ==
c66ac9db 3228 SPC3_ALUA_EMULATED) ?
e3d6f909 3229 core_emulate_report_target_port_groups :
c66ac9db
NB		 3230 NULL;
3231 }
3232 size = (cdb[6] << 24) | (cdb[7] << 16) |
3233 (cdb[8] << 8) | cdb[9];
3234 } else {
3235 /* GPCMD_SEND_KEY from multi media commands */
3236 size = (cdb[8] << 8) + cdb[9];
3237 }
05d1c7c0 3238 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3239 break;
3240 case MODE_SELECT:
3241 size = cdb[4];
3242 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3243 break;
3244 case MODE_SELECT_10:
3245 size = (cdb[7] << 8) + cdb[8];
3246 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3247 break;
3248 case MODE_SENSE:
3249 size = cdb[4];
05d1c7c0 3250 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3251 break;
3252 case MODE_SENSE_10:
3253 case GPCMD_READ_BUFFER_CAPACITY:
3254 case GPCMD_SEND_OPC:
3255 case LOG_SELECT:
3256 case LOG_SENSE:
3257 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3258 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3259 break;
3260 case READ_BLOCK_LIMITS:
3261 size = READ_BLOCK_LEN;
05d1c7c0 3262 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3263 break;
3264 case GPCMD_GET_CONFIGURATION:
3265 case GPCMD_READ_FORMAT_CAPACITIES:
3266 case GPCMD_READ_DISC_INFO:
3267 case GPCMD_READ_TRACK_RZONE_INFO:
3268 size = (cdb[7] << 8) + cdb[8];
3269 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3270 break;
3271 case PERSISTENT_RESERVE_IN:
3272 case PERSISTENT_RESERVE_OUT:
3273 cmd->transport_emulate_cdb =
e3d6f909 3274 (su_dev->t10_pr.res_type ==
c66ac9db 3275 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3276 core_scsi3_emulate_pr : NULL;
c66ac9db 3277 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3278 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3279 break;
3280 case GPCMD_MECHANISM_STATUS:
3281 case GPCMD_READ_DVD_STRUCTURE:
3282 size = (cdb[8] << 8) + cdb[9];
3283 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3284 break;
3285 case READ_POSITION:
3286 size = READ_POSITION_LEN;
05d1c7c0 3287 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3288 break;
e434f1f1 3289 case MAINTENANCE_OUT:
e3d6f909 3290 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3291 /* MAINTENANCE_OUT from SCC-2
3292 *
3293 * Check for emulated MO_SET_TARGET_PGS.
3294 */
3295 if (cdb[1] == MO_SET_TARGET_PGS) {
3296 cmd->transport_emulate_cdb =
e3d6f909 3297 (su_dev->t10_alua.alua_type ==
c66ac9db 3298 SPC3_ALUA_EMULATED) ?
e3d6f909 3299 core_emulate_set_target_port_groups :
c66ac9db
NB		 3300 NULL;
3301 }
3302
3303 size = (cdb[6] << 24) | (cdb[7] << 16) |
3304 (cdb[8] << 8) | cdb[9];
3305 } else {
3306 /* GPCMD_REPORT_KEY from multi media commands */
3307 size = (cdb[8] << 8) + cdb[9];
3308 }
05d1c7c0 3309 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3310 break;
3311 case INQUIRY:
3312 size = (cdb[3] << 8) + cdb[4];
3313 /*
3314 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3315 * See spc4r17 section 5.3
3316 */
5951146d 3317 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3318 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3319 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3320 break;
3321 case READ_BUFFER:
3322 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3323 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3324 break;
3325 case READ_CAPACITY:
3326 size = READ_CAP_LEN;
05d1c7c0 3327 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3328 break;
3329 case READ_MEDIA_SERIAL_NUMBER:
3330 case SECURITY_PROTOCOL_IN:
3331 case SECURITY_PROTOCOL_OUT:
3332 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3333 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3334 break;
3335 case SERVICE_ACTION_IN:
3336 case ACCESS_CONTROL_IN:
3337 case ACCESS_CONTROL_OUT:
3338 case EXTENDED_COPY:
3339 case READ_ATTRIBUTE:
3340 case RECEIVE_COPY_RESULTS:
3341 case WRITE_ATTRIBUTE:
3342 size = (cdb[10] << 24) | (cdb[11] << 16) |
3343 (cdb[12] << 8) | cdb[13];
05d1c7c0 3344 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3345 break;
3346 case RECEIVE_DIAGNOSTIC:
3347 case SEND_DIAGNOSTIC:
3348 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3349 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3350 break;
3351/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3352#if 0
3353 case GPCMD_READ_CD:
3354 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3355 size = (2336 * sectors);
05d1c7c0 3356 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3357 break;
3358#endif
3359 case READ_TOC:
3360 size = cdb[8];
05d1c7c0 3361 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3362 break;
3363 case REQUEST_SENSE:
3364 size = cdb[4];
05d1c7c0 3365 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3366 break;
3367 case READ_ELEMENT_STATUS:
3368 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3369 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3370 break;
3371 case WRITE_BUFFER:
3372 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3373 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3374 break;
3375 case RESERVE:
3376 case RESERVE_10:
3377 /*
3378 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3379 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3380 */
3381 if (cdb[0] == RESERVE_10)
3382 size = (cdb[7] << 8) | cdb[8];
3383 else
3384 size = cmd->data_length;
3385
3386 /*
3387 * Setup the legacy emulated handler for SPC-2 and
3388 * >= SPC-3 compatible reservation handling (CRH=1)
3389 * Otherwise, we assume the underlying SCSI logic is
3390 * is running in SPC_PASSTHROUGH, and wants reservations
3391 * emulation disabled.
3392 */
3393 cmd->transport_emulate_cdb =
e3d6f909 3394 (su_dev->t10_pr.res_type !=
c66ac9db 3395 SPC_PASSTHROUGH) ?
e3d6f909 3396 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3397 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3398 break;
3399 case RELEASE:
3400 case RELEASE_10:
3401 /*
3402 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3403 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3404 */
3405 if (cdb[0] == RELEASE_10)
3406 size = (cdb[7] << 8) | cdb[8];
3407 else
3408 size = cmd->data_length;
3409
3410 cmd->transport_emulate_cdb =
e3d6f909 3411 (su_dev->t10_pr.res_type !=
c66ac9db 3412 SPC_PASSTHROUGH) ?
e3d6f909 3413 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3414 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3415 break;
3416 case SYNCHRONIZE_CACHE:
3417 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3418 /*
3419 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3420 */
3421 if (cdb[0] == SYNCHRONIZE_CACHE) {
3422 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3423 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3424 } else {
3425 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3426 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3427 }
3428 if (sector_ret)
3429 goto out_unsupported_cdb;
3430
3431 size = transport_get_size(sectors, cdb, cmd);
3432 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3433
3434 /*
3435 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3436 */
e3d6f909 3437 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3438 break;
3439 /*
3440 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3441 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3442 */
3443 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3444 /*
3445 * Check to ensure that LBA + Range does not exceed past end of
3446 * device.
3447 */
a1d8b49a 3448 if (!transport_cmd_get_valid_sectors(cmd))
c66ac9db
NB		 3449 goto out_invalid_cdb_field;
3450 break;
3451 case UNMAP:
3452 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3453 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3454 break;
3455 case WRITE_SAME_16:
3456 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3457 if (sector_ret)
3458 goto out_unsupported_cdb;
dd3a5ad8
NB		 3459
3460 if (sectors != 0)
3461 size = transport_get_size(sectors, cdb, cmd);
3462 else
3463 size = dev->se_sub_dev->se_dev_attrib.block_size;
3464
a1d8b49a 3465 cmd->t_task_lba = get_unaligned_be16(&cdb[2]);
e3d6f909 3466 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3467 TRANSPORT_PLUGIN_PHBA_PDEV);
3468 /*
3469 * Determine if the received WRITE_SAME_16 is used to for direct
3470 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3471 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3472 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3473 * TCM/FILEIO subsystem plugin backstores.
3474 */
3475 if (!(passthrough)) {
3476 if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
3477 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3478 " bits not supported for Block Discard"
3479 " Emulation\n");
3480 goto out_invalid_cdb_field;
3481 }
3482 /*
3483 * Currently for the emulated case we only accept
3484 * tpws with the UNMAP=1 bit set.
3485 */
3486 if (!(cdb[1] & 0x08)) {
3487 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not "
3488 " supported for Block Discard Emulation\n");
3489 goto out_invalid_cdb_field;
3490 }
3491 }
3492 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3493 break;
3494 case ALLOW_MEDIUM_REMOVAL:
3495 case GPCMD_CLOSE_TRACK:
3496 case ERASE:
3497 case INITIALIZE_ELEMENT_STATUS:
3498 case GPCMD_LOAD_UNLOAD:
3499 case REZERO_UNIT:
3500 case SEEK_10:
3501 case GPCMD_SET_SPEED:
3502 case SPACE:
3503 case START_STOP:
3504 case TEST_UNIT_READY:
3505 case VERIFY:
3506 case WRITE_FILEMARKS:
3507 case MOVE_MEDIUM:
3508 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3509 break;
3510 case REPORT_LUNS:
3511 cmd->transport_emulate_cdb =
e3d6f909 3512 transport_core_report_lun_response;
c66ac9db
NB		 3513 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3514 /*
3515 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3516 * See spc4r17 section 5.3
3517 */
5951146d 3518 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3519 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3520 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3521 break;
3522 default:
3523 printk(KERN_WARNING "TARGET_CORE[%s]: Unsupported SCSI Opcode"
3524 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3525 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3526 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3527 goto out_unsupported_cdb;
3528 }
3529
3530 if (size != cmd->data_length) {
3531 printk(KERN_WARNING "TARGET_CORE[%s]: Expected Transfer Length:"
3532 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3533 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3534 cmd->data_length, size, cdb[0]);
3535
3536 cmd->cmd_spdtl = size;
3537
3538 if (cmd->data_direction == DMA_TO_DEVICE) {
3539 printk(KERN_ERR "Rejecting underflow/overflow"
3540 " WRITE data\n");
3541 goto out_invalid_cdb_field;
3542 }
3543 /*
3544 * Reject READ_* or WRITE_* with overflow/underflow for
3545 * type SCF_SCSI_DATA_SG_IO_CDB.
3546 */
e3d6f909 3547 if (!(ret) && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
c66ac9db
NB		 3548 printk(KERN_ERR "Failing OVERFLOW/UNDERFLOW for LBA op"
3549 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3550 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3551 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3552 goto out_invalid_cdb_field;
3553 }
3554
3555 if (size > cmd->data_length) {
3556 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3557 cmd->residual_count = (size - cmd->data_length);
3558 } else {
3559 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3560 cmd->residual_count = (cmd->data_length - size);
3561 }
3562 cmd->data_length = size;
3563 }
3564
d0229ae3
AG		 3565 /* Let's limit control cdbs to a page, for simplicity's sake. */
3566 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3567 size > PAGE_SIZE)
3568 goto out_invalid_cdb_field;
3569
c66ac9db
NB		 3570 transport_set_supported_SAM_opcode(cmd);
3571 return ret;
3572
3573out_unsupported_cdb:
3574 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3575 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3576 return -EINVAL;
c66ac9db
NB		 3577out_invalid_cdb_field:
3578 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3579 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3580 return -EINVAL;
c66ac9db
NB		 3581}
3582
3583static inline void transport_release_tasks(struct se_cmd *);
3584
c66ac9db 3585static void transport_memcpy_se_mem_read_contig(
c66ac9db 3586 unsigned char *dst,
a1d8b49a
AG		 3587 struct list_head *se_mem_list,
3588 u32 tot_len)
c66ac9db
NB		 3589{
3590 struct se_mem *se_mem;
3591 void *src;
a1d8b49a 3592 u32 length;
c66ac9db
NB		 3593
3594 list_for_each_entry(se_mem, se_mem_list, se_list) {
a1d8b49a 3595 length = min_t(u32, se_mem->se_len, tot_len);
c66ac9db 3596 src = page_address(se_mem->se_page) + se_mem->se_off;
c66ac9db 3597 memcpy(dst, src, length);
a1d8b49a
AG		 3598 tot_len -= length;
3599 if (!tot_len)
3600 break;
c66ac9db
NB		 3601 dst += length;
3602 }
3603}
3604
3605/*
3606 * Called from transport_generic_complete_ok() and
3607 * transport_generic_request_failure() to determine which dormant/delayed
3608 * and ordered cmds need to have their tasks added to the execution queue.
3609 */
3610static void transport_complete_task_attr(struct se_cmd *cmd)
3611{
5951146d 3612 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3613 struct se_cmd *cmd_p, *cmd_tmp;
3614 int new_active_tasks = 0;
3615
e66ecd50 3616 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3617 atomic_dec(&dev->simple_cmds);
3618 smp_mb__after_atomic_dec();
3619 dev->dev_cur_ordered_id++;
3620 DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for"
3621 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3622 cmd->se_ordered_id);
e66ecd50 3623 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3624 atomic_dec(&dev->dev_hoq_count);
3625 smp_mb__after_atomic_dec();
3626 dev->dev_cur_ordered_id++;
3627 DEBUG_STA("Incremented dev_cur_ordered_id: %u for"
3628 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3629 cmd->se_ordered_id);
e66ecd50 3630 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3631 spin_lock(&dev->ordered_cmd_lock);
5951146d 3632 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3633 atomic_dec(&dev->dev_ordered_sync);
3634 smp_mb__after_atomic_dec();
3635 spin_unlock(&dev->ordered_cmd_lock);
3636
3637 dev->dev_cur_ordered_id++;
3638 DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:"
3639 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3640 }
3641 /*
3642 * Process all commands up to the last received
3643 * ORDERED task attribute which requires another blocking
3644 * boundary
3645 */
3646 spin_lock(&dev->delayed_cmd_lock);
3647 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3648 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3649
5951146d 3650 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3651 spin_unlock(&dev->delayed_cmd_lock);
3652
3653 DEBUG_STA("Calling add_tasks() for"
3654 " cmd_p: 0x%02x Task Attr: 0x%02x"
3655 " Dormant -> Active, se_ordered_id: %u\n",
3656 T_TASK(cmd_p)->t_task_cdb[0],
3657 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3658
3659 transport_add_tasks_from_cmd(cmd_p);
3660 new_active_tasks++;
3661
3662 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3663 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3664 break;
3665 }
3666 spin_unlock(&dev->delayed_cmd_lock);
3667 /*
3668 * If new tasks have become active, wake up the transport thread
3669 * to do the processing of the Active tasks.
3670 */
3671 if (new_active_tasks != 0)
e3d6f909 3672 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3673}
3674
07bde79a
NB		 3675static int transport_complete_qf(struct se_cmd *cmd)
3676{
3677 int ret = 0;
3678
3679 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3680 return cmd->se_tfo->queue_status(cmd);
3681
3682 switch (cmd->data_direction) {
3683 case DMA_FROM_DEVICE:
3684 ret = cmd->se_tfo->queue_data_in(cmd);
3685 break;
3686 case DMA_TO_DEVICE:
3687 if (!list_empty(&cmd->t_mem_bidi_list)) {
3688 ret = cmd->se_tfo->queue_data_in(cmd);
3689 if (ret < 0)
3690 return ret;
3691 }
3692 /* Fall through for DMA_TO_DEVICE */
3693 case DMA_NONE:
3694 ret = cmd->se_tfo->queue_status(cmd);
3695 break;
3696 default:
3697 break;
3698 }
3699
3700 return ret;
3701}
3702
3703static void transport_handle_queue_full(
3704 struct se_cmd *cmd,
3705 struct se_device *dev,
3706 int (*qf_callback)(struct se_cmd *))
3707{
3708 spin_lock_irq(&dev->qf_cmd_lock);
3709 cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3710 cmd->transport_qf_callback = qf_callback;
3711 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3712 atomic_inc(&dev->dev_qf_count);
3713 smp_mb__after_atomic_inc();
3714 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3715
3716 schedule_work(&cmd->se_dev->qf_work_queue);
3717}
3718
c66ac9db
NB		 3719static void transport_generic_complete_ok(struct se_cmd *cmd)
3720{
07bde79a 3721 int reason = 0, ret;
c66ac9db
NB		 3722 /*
3723 * Check if we need to move delayed/dormant tasks from cmds on the
3724 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3725 * Attribute.
3726 */
5951146d 3727 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3728 transport_complete_task_attr(cmd);
07bde79a
NB		 3729 /*
3730 * Check to schedule QUEUE_FULL work, or execute an existing
3731 * cmd->transport_qf_callback()
3732 */
3733 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3734 schedule_work(&cmd->se_dev->qf_work_queue);
3735
3736 if (cmd->transport_qf_callback) {
3737 ret = cmd->transport_qf_callback(cmd);
3738 if (ret < 0)
3739 goto queue_full;
3740
3741 cmd->transport_qf_callback = NULL;
3742 goto done;
3743 }
c66ac9db
NB		 3744 /*
3745 * Check if we need to retrieve a sense buffer from
3746 * the struct se_cmd in question.
3747 */
3748 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3749 if (transport_get_sense_data(cmd) < 0)
3750 reason = TCM_NON_EXISTENT_LUN;
3751
3752 /*
3753 * Only set when an struct se_task->task_scsi_status returned
3754 * a non GOOD status.
3755 */
3756 if (cmd->scsi_status) {
07bde79a 3757 ret = transport_send_check_condition_and_sense(
c66ac9db 3758 cmd, reason, 1);
07bde79a
NB		 3759 if (ret == -EAGAIN)
3760 goto queue_full;
3761
c66ac9db
NB		 3762 transport_lun_remove_cmd(cmd);
3763 transport_cmd_check_stop_to_fabric(cmd);
3764 return;
3765 }
3766 }
3767 /*
25985edc 3768 * Check for a callback, used by amongst other things
c66ac9db
NB		 3769 * XDWRITE_READ_10 emulation.
3770 */
3771 if (cmd->transport_complete_callback)
3772 cmd->transport_complete_callback(cmd);
3773
3774 switch (cmd->data_direction) {
3775 case DMA_FROM_DEVICE:
3776 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3777 if (cmd->se_lun->lun_sep) {
3778 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3779 cmd->data_length;
3780 }
3781 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3782
07bde79a
NB		 3783 ret = cmd->se_tfo->queue_data_in(cmd);
3784 if (ret == -EAGAIN)
3785 goto queue_full;
c66ac9db
NB		 3786 break;
3787 case DMA_TO_DEVICE:
3788 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3789 if (cmd->se_lun->lun_sep) {
3790 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3791 cmd->data_length;
3792 }
3793 spin_unlock(&cmd->se_lun->lun_sep_lock);
3794 /*
3795 * Check if we need to send READ payload for BIDI-COMMAND
3796 */
a1d8b49a 3797 if (!list_empty(&cmd->t_mem_bidi_list)) {
c66ac9db 3798 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3799 if (cmd->se_lun->lun_sep) {
3800 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3801 cmd->data_length;
3802 }
3803 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3804 ret = cmd->se_tfo->queue_data_in(cmd);
3805 if (ret == -EAGAIN)
3806 goto queue_full;
c66ac9db
NB		 3807 break;
3808 }
3809 /* Fall through for DMA_TO_DEVICE */
3810 case DMA_NONE:
07bde79a
NB		 3811 ret = cmd->se_tfo->queue_status(cmd);
3812 if (ret == -EAGAIN)
3813 goto queue_full;
c66ac9db
NB		 3814 break;
3815 default:
3816 break;
3817 }
3818
07bde79a 3819done:
c66ac9db
NB		 3820 transport_lun_remove_cmd(cmd);
3821 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3822 return;
3823
3824queue_full:
3825 printk(KERN_INFO "Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3826 " data_direction: %d\n", cmd, cmd->data_direction);
3827 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 3828}
3829
3830static void transport_free_dev_tasks(struct se_cmd *cmd)
3831{
3832 struct se_task *task, *task_tmp;
3833 unsigned long flags;
3834
a1d8b49a 3835 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3836 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3837 &cmd->t_task_list, t_list) {
c66ac9db
NB		 3838 if (atomic_read(&task->task_active))
3839 continue;
3840
3841 kfree(task->task_sg_bidi);
3842 kfree(task->task_sg);
3843
3844 list_del(&task->t_list);
3845
a1d8b49a 3846 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3847 if (task->se_dev)
e3d6f909 3848 task->se_dev->transport->free_task(task);
c66ac9db
NB		 3849 else
3850 printk(KERN_ERR "task[%u] - task->se_dev is NULL\n",
3851 task->task_no);
a1d8b49a 3852 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3853 }
a1d8b49a 3854 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3855}
3856
3857static inline void transport_free_pages(struct se_cmd *cmd)
3858{
3859 struct se_mem *se_mem, *se_mem_tmp;
3860 int free_page = 1;
3861
3862 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3863 free_page = 0;
3864 if (cmd->se_dev->transport->do_se_mem_map)
3865 free_page = 0;
3866
c66ac9db 3867 list_for_each_entry_safe(se_mem, se_mem_tmp,
a1d8b49a 3868 &cmd->t_mem_list, se_list) {
c66ac9db
NB		 3869 /*
3870 * We only release call __free_page(struct se_mem->se_page) when
3871 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3872 */
3873 if (free_page)
3874 __free_page(se_mem->se_page);
3875
3876 list_del(&se_mem->se_list);
3877 kmem_cache_free(se_mem_cache, se_mem);
3878 }
a1d8b49a 3879 cmd->t_tasks_se_num = 0;
c66ac9db 3880
5951146d 3881 list_for_each_entry_safe(se_mem, se_mem_tmp,
a1d8b49a 3882 &cmd->t_mem_bidi_list, se_list) {
5951146d
AG		 3883 /*
3884 * We only release call __free_page(struct se_mem->se_page) when
3885 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3886 */
3887 if (free_page)
3888 __free_page(se_mem->se_page);
c66ac9db 3889
5951146d
AG		 3890 list_del(&se_mem->se_list);
3891 kmem_cache_free(se_mem_cache, se_mem);
c66ac9db 3892 }
a1d8b49a 3893 cmd->t_tasks_se_bidi_num = 0;
c66ac9db
NB		 3894}
3895
3896static inline void transport_release_tasks(struct se_cmd *cmd)
3897{
3898 transport_free_dev_tasks(cmd);
3899}
3900
3901static inline int transport_dec_and_check(struct se_cmd *cmd)
3902{
3903 unsigned long flags;
3904
a1d8b49a
AG		 3905 spin_lock_irqsave(&cmd->t_state_lock, flags);
3906 if (atomic_read(&cmd->t_fe_count)) {
3907 if (!(atomic_dec_and_test(&cmd->t_fe_count))) {
3908 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3909 flags);
3910 return 1;
3911 }
3912 }
3913
a1d8b49a
AG		 3914 if (atomic_read(&cmd->t_se_count)) {
3915 if (!(atomic_dec_and_test(&cmd->t_se_count))) {
3916 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3917 flags);
3918 return 1;
3919 }
3920 }
a1d8b49a 3921 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3922
3923 return 0;
3924}
3925
3926static void transport_release_fe_cmd(struct se_cmd *cmd)
3927{
3928 unsigned long flags;
3929
3930 if (transport_dec_and_check(cmd))
3931 return;
3932
a1d8b49a
AG		 3933 spin_lock_irqsave(&cmd->t_state_lock, flags);
3934 if (!(atomic_read(&cmd->transport_dev_active))) {
3935 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3936 goto free_pages;
3937 }
a1d8b49a 3938 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3939 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3940 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3941
3942 transport_release_tasks(cmd);
3943free_pages:
3944 transport_free_pages(cmd);
3945 transport_free_se_cmd(cmd);
35462975 3946 cmd->se_tfo->release_cmd(cmd);
c66ac9db
NB		 3947}
3948
35462975
CH		 3949static int
3950transport_generic_remove(struct se_cmd *cmd, int session_reinstatement)
c66ac9db
NB		 3951{
3952 unsigned long flags;
3953
c66ac9db
NB		 3954 if (transport_dec_and_check(cmd)) {
3955 if (session_reinstatement) {
a1d8b49a 3956 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3957 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3958 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3959 flags);
3960 }
3961 return 1;
3962 }
3963
a1d8b49a
AG		 3964 spin_lock_irqsave(&cmd->t_state_lock, flags);
3965 if (!(atomic_read(&cmd->transport_dev_active))) {
3966 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3967 goto free_pages;
3968 }
a1d8b49a 3969 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3970 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3971 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3972
3973 transport_release_tasks(cmd);
5951146d 3974
c66ac9db
NB		 3975free_pages:
3976 transport_free_pages(cmd);
35462975 3977 transport_release_cmd(cmd);
c66ac9db
NB		 3978 return 0;
3979}
3980
3981/*
3982 * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map
3983 * @cmd: Associated se_cmd descriptor
3984 * @mem: SGL style memory for TCM WRITE / READ
3985 * @sg_mem_num: Number of SGL elements
3986 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3987 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3988 *
3989 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3990 * of parameters.
3991 */
3992int transport_generic_map_mem_to_cmd(
3993 struct se_cmd *cmd,
5951146d
AG		 3994 struct scatterlist *sgl,
3995 u32 sgl_count,
3996 struct scatterlist *sgl_bidi,
3997 u32 sgl_bidi_count)
c66ac9db 3998{
c66ac9db
NB		 3999 int ret;
4000
5951146d 4001 if (!sgl || !sgl_count)
c66ac9db 4002 return 0;
c66ac9db 4003
c66ac9db 4004 /*
5951146d 4005 * Convert sgls (sgl, sgl_bidi) to list of se_mems
c66ac9db
NB		 4006 */
4007 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
4008 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
4009 /*
4010 * For CDB using TCM struct se_mem linked list scatterlist memory
4011 * processed into a TCM struct se_subsystem_dev, we do the mapping
4012 * from the passed physical memory to struct se_mem->se_page here.
4013 */
a1d8b49a 4014 ret = transport_map_sg_to_mem(cmd, &cmd->t_mem_list, sgl);
c66ac9db
NB		 4015 if (ret < 0)
4016 return -ENOMEM;
4017
a1d8b49a 4018 cmd->t_tasks_se_num = ret;
c66ac9db
NB		 4019 /*
4020 * Setup BIDI READ list of struct se_mem elements
4021 */
5951146d 4022 if (sgl_bidi && sgl_bidi_count) {
a1d8b49a 4023 ret = transport_map_sg_to_mem(cmd, &cmd->t_mem_bidi_list, sgl_bidi);
5951146d 4024 if (ret < 0)
c66ac9db 4025 return -ENOMEM;
c66ac9db 4026
a1d8b49a 4027 cmd->t_tasks_se_bidi_num = ret;
c66ac9db
NB		 4028 }
4029 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 4030 }
4031
4032 return 0;
4033}
4034EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
4035
4036
4037static inline long long transport_dev_end_lba(struct se_device *dev)
4038{
4039 return dev->transport->get_blocks(dev) + 1;
4040}
4041
a1d8b49a 4042static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
c66ac9db 4043{
5951146d 4044 struct se_device *dev = cmd->se_dev;
a1d8b49a 4045 u32 sectors;
c66ac9db 4046
e3d6f909 4047 if (dev->transport->get_device_type(dev) != TYPE_DISK)
c66ac9db
NB		 4048 return 0;
4049
a1d8b49a
AG		 4050 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
4051
4052 if ((cmd->t_task_lba + sectors) >
c66ac9db
NB		 4053 transport_dev_end_lba(dev)) {
4054 printk(KERN_ERR "LBA: %llu Sectors: %u exceeds"
4055 " transport_dev_end_lba(): %llu\n",
a1d8b49a 4056 cmd->t_task_lba, sectors,
c66ac9db 4057 transport_dev_end_lba(dev));
a1d8b49a 4058 return 0;
c66ac9db
NB		 4059 }
4060
a1d8b49a 4061 return sectors;
c66ac9db
NB		 4062}
4063
4064static int transport_new_cmd_obj(struct se_cmd *cmd)
4065{
5951146d 4066 struct se_device *dev = cmd->se_dev;
a1d8b49a
AG		 4067 u32 task_cdbs;
4068 u32 rc;
c66ac9db
NB		 4069
4070 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
a1d8b49a
AG		 4071 task_cdbs = 1;
4072 cmd->t_task_list_num = 1;
c66ac9db
NB		 4073 } else {
4074 int set_counts = 1;
4075
4076 /*
4077 * Setup any BIDI READ tasks and memory from
a1d8b49a 4078 * cmd->t_mem_bidi_list so the READ struct se_tasks
c66ac9db
NB		 4079 * are queued first for the non pSCSI passthrough case.
4080 */
a1d8b49a 4081 if (!list_empty(&cmd->t_mem_bidi_list) &&
e3d6f909 4082 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
a1d8b49a
AG		 4083 rc = transport_allocate_tasks(cmd,
4084 cmd->t_task_lba,
4085 transport_cmd_get_valid_sectors(cmd),
4086 DMA_FROM_DEVICE, &cmd->t_mem_bidi_list,
c66ac9db
NB		 4087 set_counts);
4088 if (!(rc)) {
4089 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4090 cmd->scsi_sense_reason =
4091 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4092 return PYX_TRANSPORT_LU_COMM_FAILURE;
4093 }
4094 set_counts = 0;
4095 }
4096 /*
a1d8b49a 4097 * Setup the tasks and memory from cmd->t_mem_list
c66ac9db
NB		 4098 * Note for BIDI transfers this will contain the WRITE payload
4099 */
a1d8b49a
AG		 4100 task_cdbs = transport_allocate_tasks(cmd,
4101 cmd->t_task_lba,
4102 transport_cmd_get_valid_sectors(cmd),
4103 cmd->data_direction, &cmd->t_mem_list,
c66ac9db
NB		 4104 set_counts);
4105 if (!(task_cdbs)) {
4106 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4107 cmd->scsi_sense_reason =
4108 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4109 return PYX_TRANSPORT_LU_COMM_FAILURE;
4110 }
a1d8b49a 4111 cmd->t_task_list_num = task_cdbs;
c66ac9db
NB		 4112
4113#if 0
4114 printk(KERN_INFO "data_length: %u, LBA: %llu t_tasks_sectors:"
4115 " %u, t_task_cdbs: %u\n", obj_ptr, cmd->data_length,
a1d8b49a
AG		 4116 cmd->t_task_lba, cmd->t_tasks_sectors,
4117 cmd->t_task_cdbs);
c66ac9db
NB		 4118#endif
4119 }
4120
a1d8b49a
AG		 4121 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
4122 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
4123 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 4124 return 0;
4125}
4126
05d1c7c0
AG		 4127void *transport_kmap_first_data_page(struct se_cmd *cmd)
4128{
4129 struct se_mem *se_mem;
4130
4131 BUG_ON(list_empty(&cmd->t_mem_list));
4132
4133 se_mem = list_first_entry(&cmd->t_mem_list, struct se_mem, se_list);
4134
4135 /*
4136 * 1st se_mem should point to a page, and we shouldn't need more than
4137 * that for this cmd
4138 */
4139 BUG_ON(cmd->data_length > PAGE_SIZE);
4140
4141 return kmap(se_mem->se_page);
4142}
4143EXPORT_SYMBOL(transport_kmap_first_data_page);
4144
4145void transport_kunmap_first_data_page(struct se_cmd *cmd)
4146{
4147 struct se_mem *se_mem;
4148
4149 BUG_ON(list_empty(&cmd->t_mem_list));
4150
4151 se_mem = list_first_entry(&cmd->t_mem_list, struct se_mem, se_list);
4152
4153 kunmap(se_mem->se_page);
4154}
4155EXPORT_SYMBOL(transport_kunmap_first_data_page);
4156
c66ac9db 4157static int
05d1c7c0 4158transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 4159{
c66ac9db 4160 struct se_mem *se_mem;
05d1c7c0 4161 int length = cmd->data_length;
c66ac9db 4162
c66ac9db
NB		 4163 /*
4164 * If the device uses memory mapping this is enough.
4165 */
4166 if (cmd->se_dev->transport->do_se_mem_map)
4167 return 0;
4168
05d1c7c0 4169 /* Even cmds with length 0 will get here, btw */
c66ac9db
NB		 4170 while (length) {
4171 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4172 if (!(se_mem)) {
4173 printk(KERN_ERR "Unable to allocate struct se_mem\n");
4174 goto out;
4175 }
c66ac9db
NB		 4176
4177/* #warning FIXME Allocate contigous pages for struct se_mem elements */
a1d8b49a 4178 se_mem->se_page = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0);
c66ac9db
NB		 4179 if (!(se_mem->se_page)) {
4180 printk(KERN_ERR "alloc_pages() failed\n");
4181 goto out;
4182 }
4183
87210568 4184 INIT_LIST_HEAD(&se_mem->se_list);
a1d8b49a
AG		 4185 se_mem->se_len = min_t(u32, length, PAGE_SIZE);
4186 list_add_tail(&se_mem->se_list, &cmd->t_mem_list);
4187 cmd->t_tasks_se_num++;
c66ac9db
NB		 4188
4189 DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)"
4190 " Offset(%u)\n", se_mem->se_page, se_mem->se_len,
4191 se_mem->se_off);
4192
4193 length -= se_mem->se_len;
4194 }
4195
4196 DEBUG_MEM("Allocated total struct se_mem elements(%u)\n",
a1d8b49a 4197 cmd->t_tasks_se_num);
c66ac9db
NB		 4198
4199 return 0;
4200out:
87210568
JJ		 4201 if (se_mem)
4202 __free_pages(se_mem->se_page, 0);
4203 kmem_cache_free(se_mem_cache, se_mem);
e3d6f909 4204 return -ENOMEM;
c66ac9db
NB		 4205}
4206
e3d6f909 4207int transport_init_task_sg(
c66ac9db
NB		 4208 struct se_task *task,
4209 struct se_mem *in_se_mem,
4210 u32 task_offset)
4211{
4212 struct se_cmd *se_cmd = task->task_se_cmd;
5951146d 4213 struct se_device *se_dev = se_cmd->se_dev;
c66ac9db 4214 struct se_mem *se_mem = in_se_mem;
e3d6f909 4215 struct target_core_fabric_ops *tfo = se_cmd->se_tfo;
c66ac9db
NB		 4216 u32 sg_length, task_size = task->task_size, task_sg_num_padded;
4217
4218 while (task_size != 0) {
4219 DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)"
4220 " se_mem->se_off(%u) task_offset(%u)\n",
4221 se_mem->se_page, se_mem->se_len,
4222 se_mem->se_off, task_offset);
4223
4224 if (task_offset == 0) {
4225 if (task_size >= se_mem->se_len) {
4226 sg_length = se_mem->se_len;
4227
4228 if (!(list_is_last(&se_mem->se_list,
a1d8b49a 4229 &se_cmd->t_mem_list)))
c66ac9db
NB		 4230 se_mem = list_entry(se_mem->se_list.next,
4231 struct se_mem, se_list);
4232 } else {
4233 sg_length = task_size;
4234 task_size -= sg_length;
4235 goto next;
4236 }
4237
4238 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4239 sg_length, task_size);
4240 } else {
4241 if ((se_mem->se_len - task_offset) > task_size) {
4242 sg_length = task_size;
4243 task_size -= sg_length;
4244 goto next;
4245 } else {
4246 sg_length = (se_mem->se_len - task_offset);
4247
4248 if (!(list_is_last(&se_mem->se_list,
a1d8b49a 4249 &se_cmd->t_mem_list)))
c66ac9db
NB		 4250 se_mem = list_entry(se_mem->se_list.next,
4251 struct se_mem, se_list);
4252 }
4253
4254 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4255 sg_length, task_size);
4256
4257 task_offset = 0;
4258 }
4259 task_size -= sg_length;
4260next:
4261 DEBUG_SC("task[%u] - Reducing task_size to(%u)\n",
4262 task->task_no, task_size);
4263
4264 task->task_sg_num++;
4265 }
4266 /*
4267 * Check if the fabric module driver is requesting that all
4268 * struct se_task->task_sg[] be chained together.. If so,
4269 * then allocate an extra padding SG entry for linking and
4270 * marking the end of the chained SGL.
4271 */
4272 if (tfo->task_sg_chaining) {
4273 task_sg_num_padded = (task->task_sg_num + 1);
4274 task->task_padded_sg = 1;
4275 } else
4276 task_sg_num_padded = task->task_sg_num;
4277
4278 task->task_sg = kzalloc(task_sg_num_padded *
4279 sizeof(struct scatterlist), GFP_KERNEL);
4280 if (!(task->task_sg)) {
4281 printk(KERN_ERR "Unable to allocate memory for"
4282 " task->task_sg\n");
e3d6f909 4283 return -ENOMEM;
c66ac9db
NB		 4284 }
4285 sg_init_table(&task->task_sg[0], task_sg_num_padded);
4286 /*
4287 * Setup task->task_sg_bidi for SCSI READ payload for
4288 * TCM/pSCSI passthrough if present for BIDI-COMMAND
4289 */
a1d8b49a 4290 if (!list_empty(&se_cmd->t_mem_bidi_list) &&
e3d6f909 4291 (se_dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) {
c66ac9db
NB		 4292 task->task_sg_bidi = kzalloc(task_sg_num_padded *
4293 sizeof(struct scatterlist), GFP_KERNEL);
4294 if (!(task->task_sg_bidi)) {
e3d6f909
AG		 4295 kfree(task->task_sg);
4296 task->task_sg = NULL;
c66ac9db
NB		 4297 printk(KERN_ERR "Unable to allocate memory for"
4298 " task->task_sg_bidi\n");
e3d6f909 4299 return -ENOMEM;
c66ac9db
NB		 4300 }
4301 sg_init_table(&task->task_sg_bidi[0], task_sg_num_padded);
4302 }
4303 /*
4304 * For the chaining case, setup the proper end of SGL for the
4305 * initial submission struct task into struct se_subsystem_api.
4306 * This will be cleared later by transport_do_task_sg_chain()
4307 */
4308 if (task->task_padded_sg) {
4309 sg_mark_end(&task->task_sg[task->task_sg_num - 1]);
4310 /*
4311 * Added the 'if' check before marking end of bi-directional
4312 * scatterlist (which gets created only in case of request
4313 * (RD + WR).
4314 */
4315 if (task->task_sg_bidi)
4316 sg_mark_end(&task->task_sg_bidi[task->task_sg_num - 1]);
4317 }
4318
4319 DEBUG_SC("Successfully allocated task->task_sg_num(%u),"
4320 " task_sg_num_padded(%u)\n", task->task_sg_num,
4321 task_sg_num_padded);
4322
4323 return task->task_sg_num;
4324}
4325
a1d8b49a
AG		 4326/* Reduce sectors if they are too long for the device */
4327static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 4328 struct se_device *dev,
4329 unsigned long long lba,
a1d8b49a 4330 sector_t sectors)
c66ac9db 4331{
a1d8b49a 4332 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 4333
a1d8b49a
AG		 4334 if (dev->transport->get_device_type(dev) == TYPE_DISK)
4335 if ((lba + sectors) > transport_dev_end_lba(dev))
4336 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 4337
a1d8b49a 4338 return sectors;
c66ac9db
NB		 4339}
4340
5951146d
AG		 4341/*
4342 * Convert a sgl into a linked list of se_mems.
4343 */
c66ac9db
NB		 4344static int transport_map_sg_to_mem(
4345 struct se_cmd *cmd,
4346 struct list_head *se_mem_list,
a1d8b49a 4347 struct scatterlist *sg)
c66ac9db
NB		 4348{
4349 struct se_mem *se_mem;
5951146d 4350 u32 cmd_size = cmd->data_length;
a1d8b49a 4351 int sg_count = 0;
c66ac9db 4352
5951146d 4353 WARN_ON(!sg);
c66ac9db
NB		 4354
4355 while (cmd_size) {
5951146d
AG		 4356 /*
4357 * NOTE: it is safe to return -ENOMEM at any time in creating this
4358 * list because transport_free_pages() will eventually be called, and is
4359 * smart enough to deallocate all list items for sg and sg_bidi lists.
4360 */
c66ac9db
NB		 4361 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4362 if (!(se_mem)) {
4363 printk(KERN_ERR "Unable to allocate struct se_mem\n");
e3d6f909 4364 return -ENOMEM;
c66ac9db
NB		 4365 }
4366 INIT_LIST_HEAD(&se_mem->se_list);
4367 DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u"
4368 " sg_page: %p offset: %d length: %d\n", cmd_size,
4369 sg_page(sg), sg->offset, sg->length);
4370
4371 se_mem->se_page = sg_page(sg);
4372 se_mem->se_off = sg->offset;
4373
4374 if (cmd_size > sg->length) {
4375 se_mem->se_len = sg->length;
4376 sg = sg_next(sg);
c66ac9db
NB		 4377 } else
4378 se_mem->se_len = cmd_size;
4379
4380 cmd_size -= se_mem->se_len;
a1d8b49a 4381 sg_count++;
c66ac9db 4382
5951146d
AG		 4383 DEBUG_MEM("sg_to_mem: sg_count: %u cmd_size: %u\n",
4384 sg_count, cmd_size);
c66ac9db
NB		 4385 DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n",
4386 se_mem->se_page, se_mem->se_off, se_mem->se_len);
4387
4388 list_add_tail(&se_mem->se_list, se_mem_list);
c66ac9db
NB		 4389 }
4390
5951146d 4391 DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments\n", sg_count);
c66ac9db 4392
a1d8b49a 4393 return sg_count;
c66ac9db
NB		 4394}
4395
4396/* transport_map_mem_to_sg():
4397 *
4398 *
4399 */
4400int transport_map_mem_to_sg(
4401 struct se_task *task,
4402 struct list_head *se_mem_list,
a1d8b49a 4403 struct scatterlist *sg,
c66ac9db
NB		 4404 struct se_mem *in_se_mem,
4405 struct se_mem **out_se_mem,
4406 u32 *se_mem_cnt,
4407 u32 *task_offset)
4408{
4409 struct se_cmd *se_cmd = task->task_se_cmd;
4410 struct se_mem *se_mem = in_se_mem;
c66ac9db
NB		 4411 u32 task_size = task->task_size, sg_no = 0;
4412
4413 if (!sg) {
4414 printk(KERN_ERR "Unable to locate valid struct"
4415 " scatterlist pointer\n");
e3d6f909 4416 return -EINVAL;
c66ac9db
NB		 4417 }
4418
4419 while (task_size != 0) {
4420 /*
a1d8b49a 4421 * Setup the contiguous array of scatterlists for
c66ac9db
NB		 4422 * this struct se_task.
4423 */
4424 sg_assign_page(sg, se_mem->se_page);
4425
4426 if (*task_offset == 0) {
4427 sg->offset = se_mem->se_off;
4428
4429 if (task_size >= se_mem->se_len) {
4430 sg->length = se_mem->se_len;
4431
4432 if (!(list_is_last(&se_mem->se_list,
a1d8b49a 4433 &se_cmd->t_mem_list))) {
c66ac9db
NB		 4434 se_mem = list_entry(se_mem->se_list.next,
4435 struct se_mem, se_list);
4436 (*se_mem_cnt)++;
4437 }
4438 } else {
4439 sg->length = task_size;
4440 /*
4441 * Determine if we need to calculate an offset
4442 * into the struct se_mem on the next go around..
4443 */
4444 task_size -= sg->length;
4445 if (!(task_size))
4446 *task_offset = sg->length;
4447
4448 goto next;
4449 }
4450
4451 } else {
4452 sg->offset = (*task_offset + se_mem->se_off);
4453
4454 if ((se_mem->se_len - *task_offset) > task_size) {
4455 sg->length = task_size;
4456 /*
4457 * Determine if we need to calculate an offset
4458 * into the struct se_mem on the next go around..
4459 */
4460 task_size -= sg->length;
4461 if (!(task_size))
4462 *task_offset += sg->length;
4463
4464 goto next;
4465 } else {
4466 sg->length = (se_mem->se_len - *task_offset);
4467
4468 if (!(list_is_last(&se_mem->se_list,
a1d8b49a 4469 &se_cmd->t_mem_list))) {
c66ac9db
NB		 4470 se_mem = list_entry(se_mem->se_list.next,
4471 struct se_mem, se_list);
4472 (*se_mem_cnt)++;
4473 }
4474 }
4475
4476 *task_offset = 0;
4477 }
4478 task_size -= sg->length;
4479next:
4480 DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing"
4481 " task_size to(%u), task_offset: %u\n", task->task_no, sg_no,
4482 sg_page(sg), sg->length, sg->offset, task_size, *task_offset);
4483
4484 sg_no++;
4485 if (!(task_size))
4486 break;
4487
4488 sg = sg_next(sg);
4489
4490 if (task_size > se_cmd->data_length)
4491 BUG();
4492 }
4493 *out_se_mem = se_mem;
4494
4495 DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)"
4496 " SGs\n", task->task_no, *se_mem_cnt, sg_no);
4497
4498 return 0;
4499}
4500
4501/*
4502 * This function can be used by HW target mode drivers to create a linked
4503 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4504 * This is intended to be called during the completion path by TCM Core
4505 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4506 */
4507void transport_do_task_sg_chain(struct se_cmd *cmd)
4508{
4509 struct scatterlist *sg_head = NULL, *sg_link = NULL, *sg_first = NULL;
4510 struct scatterlist *sg_head_cur = NULL, *sg_link_cur = NULL;
4511 struct scatterlist *sg, *sg_end = NULL, *sg_end_cur = NULL;
4512 struct se_task *task;
e3d6f909 4513 struct target_core_fabric_ops *tfo = cmd->se_tfo;
c66ac9db
NB		 4514 u32 task_sg_num = 0, sg_count = 0;
4515 int i;
4516
4517 if (tfo->task_sg_chaining == 0) {
4518 printk(KERN_ERR "task_sg_chaining is diabled for fabric module:"
4519 " %s\n", tfo->get_fabric_name());
4520 dump_stack();
4521 return;
4522 }
4523 /*
4524 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 4525 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 4526 */
a1d8b49a 4527 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 4528 if (!(task->task_sg) || !(task->task_padded_sg))
4529 continue;
4530
4531 if (sg_head && sg_link) {
4532 sg_head_cur = &task->task_sg[0];
4533 sg_link_cur = &task->task_sg[task->task_sg_num];
4534 /*
4535 * Either add chain or mark end of scatterlist
4536 */
4537 if (!(list_is_last(&task->t_list,
a1d8b49a 4538 &cmd->t_task_list))) {
c66ac9db
NB		 4539 /*
4540 * Clear existing SGL termination bit set in
e3d6f909 4541 * transport_init_task_sg(), see sg_mark_end()
c66ac9db
NB		 4542 */
4543 sg_end_cur = &task->task_sg[task->task_sg_num - 1];
4544 sg_end_cur->page_link &= ~0x02;
4545
4546 sg_chain(sg_head, task_sg_num, sg_head_cur);
c66ac9db 4547 sg_count += task->task_sg_num;
97868c89
NB		 4548 task_sg_num = (task->task_sg_num + 1);
4549 } else {
4550 sg_chain(sg_head, task_sg_num, sg_head_cur);
4551 sg_count += task->task_sg_num;
4552 task_sg_num = task->task_sg_num;
4553 }
c66ac9db
NB		 4554
4555 sg_head = sg_head_cur;
4556 sg_link = sg_link_cur;
c66ac9db
NB		 4557 continue;
4558 }
4559 sg_head = sg_first = &task->task_sg[0];
4560 sg_link = &task->task_sg[task->task_sg_num];
c66ac9db
NB		 4561 /*
4562 * Check for single task..
4563 */
a1d8b49a 4564 if (!(list_is_last(&task->t_list, &cmd->t_task_list))) {
c66ac9db
NB		 4565 /*
4566 * Clear existing SGL termination bit set in
e3d6f909 4567 * transport_init_task_sg(), see sg_mark_end()
c66ac9db
NB		 4568 */
4569 sg_end = &task->task_sg[task->task_sg_num - 1];
4570 sg_end->page_link &= ~0x02;
c66ac9db 4571 sg_count += task->task_sg_num;
97868c89
NB		 4572 task_sg_num = (task->task_sg_num + 1);
4573 } else {
4574 sg_count += task->task_sg_num;
4575 task_sg_num = task->task_sg_num;
4576 }
c66ac9db
NB		 4577 }
4578 /*
4579 * Setup the starting pointer and total t_tasks_sg_linked_no including
4580 * padding SGs for linking and to mark the end.
4581 */
a1d8b49a
AG		 4582 cmd->t_tasks_sg_chained = sg_first;
4583 cmd->t_tasks_sg_chained_no = sg_count;
c66ac9db 4584
a1d8b49a
AG		 4585 DEBUG_CMD_M("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
4586 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4587 cmd->t_tasks_sg_chained_no);
c66ac9db 4588
a1d8b49a
AG		 4589 for_each_sg(cmd->t_tasks_sg_chained, sg,
4590 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 4591
5951146d
AG		 4592 DEBUG_CMD_M("SG[%d]: %p page: %p length: %d offset: %d\n",
4593 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db
NB		 4594 if (sg_is_chain(sg))
4595 DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg);
4596 if (sg_is_last(sg))
4597 DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg);
4598 }
c66ac9db
NB		 4599}
4600EXPORT_SYMBOL(transport_do_task_sg_chain);
4601
4602static int transport_do_se_mem_map(
4603 struct se_device *dev,
4604 struct se_task *task,
4605 struct list_head *se_mem_list,
4606 void *in_mem,
4607 struct se_mem *in_se_mem,
4608 struct se_mem **out_se_mem,
4609 u32 *se_mem_cnt,
4610 u32 *task_offset_in)
4611{
4612 u32 task_offset = *task_offset_in;
4613 int ret = 0;
4614 /*
4615 * se_subsystem_api_t->do_se_mem_map is used when internal allocation
4616 * has been done by the transport plugin.
4617 */
e3d6f909
AG		 4618 if (dev->transport->do_se_mem_map) {
4619 ret = dev->transport->do_se_mem_map(task, se_mem_list,
c66ac9db
NB		 4620 in_mem, in_se_mem, out_se_mem, se_mem_cnt,
4621 task_offset_in);
4622 if (ret == 0)
a1d8b49a 4623 task->task_se_cmd->t_tasks_se_num += *se_mem_cnt;
c66ac9db
NB		 4624
4625 return ret;
4626 }
e63af958
NB		 4627
4628 BUG_ON(list_empty(se_mem_list));
c66ac9db
NB		 4629 /*
4630 * This is the normal path for all normal non BIDI and BIDI-COMMAND
4631 * WRITE payloads.. If we need to do BIDI READ passthrough for
4632 * TCM/pSCSI the first call to transport_do_se_mem_map ->
e3d6f909 4633 * transport_init_task_sg() -> transport_map_mem_to_sg() will do the
c66ac9db
NB		 4634 * allocation for task->task_sg_bidi, and the subsequent call to
4635 * transport_do_se_mem_map() from transport_generic_get_cdb_count()
4636 */
4637 if (!(task->task_sg_bidi)) {
4638 /*
4639 * Assume default that transport plugin speaks preallocated
4640 * scatterlists.
4641 */
e3d6f909
AG		 4642 ret = transport_init_task_sg(task, in_se_mem, task_offset);
4643 if (ret <= 0)
4644 return ret;
c66ac9db
NB		 4645 /*
4646 * struct se_task->task_sg now contains the struct scatterlist array.
4647 */
4648 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg,
4649 in_se_mem, out_se_mem, se_mem_cnt,
4650 task_offset_in);
4651 }
4652 /*
4653 * Handle the se_mem_list -> struct task->task_sg_bidi
4654 * memory map for the extra BIDI READ payload
4655 */
4656 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg_bidi,
4657 in_se_mem, out_se_mem, se_mem_cnt,
4658 task_offset_in);
4659}
4660
a1d8b49a
AG		 4661/*
4662 * Break up cmd into chunks transport can handle
4663 */
4664static u32 transport_allocate_tasks(
c66ac9db
NB		 4665 struct se_cmd *cmd,
4666 unsigned long long lba,
4667 u32 sectors,
4668 enum dma_data_direction data_direction,
4669 struct list_head *mem_list,
4670 int set_counts)
4671{
4672 unsigned char *cdb = NULL;
4673 struct se_task *task;
a1d8b49a
AG		 4674 struct se_mem *se_mem = NULL;
4675 struct se_mem *se_mem_lout = NULL;
4676 struct se_mem *se_mem_bidi = NULL;
4677 struct se_mem *se_mem_bidi_lout = NULL;
5951146d 4678 struct se_device *dev = cmd->se_dev;
a1d8b49a
AG		 4679 int ret;
4680 u32 task_offset_in = 0;
4681 u32 se_mem_cnt = 0;
4682 u32 se_mem_bidi_cnt = 0;
4683 u32 task_cdbs = 0;
c66ac9db 4684
a1d8b49a 4685 BUG_ON(!mem_list);
c66ac9db
NB		 4686 /*
4687 * While using RAMDISK_DR backstores is the only case where
4688 * mem_list will ever be empty at this point.
4689 */
4690 if (!(list_empty(mem_list)))
5951146d 4691 se_mem = list_first_entry(mem_list, struct se_mem, se_list);
c66ac9db
NB		 4692 /*
4693 * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to
4694 * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation
4695 */
a1d8b49a 4696 if (!list_empty(&cmd->t_mem_bidi_list) &&
e3d6f909 4697 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV))
a1d8b49a 4698 se_mem_bidi = list_first_entry(&cmd->t_mem_bidi_list,
c66ac9db
NB		 4699 struct se_mem, se_list);
4700
4701 while (sectors) {
a1d8b49a
AG		 4702 sector_t limited_sectors;
4703
c66ac9db 4704 DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n",
e3d6f909 4705 cmd->se_tfo->get_task_tag(cmd), lba, sectors,
c66ac9db
NB		 4706 transport_dev_end_lba(dev));
4707
a1d8b49a
AG		 4708 limited_sectors = transport_limit_task_sectors(dev, lba, sectors);
4709 if (!limited_sectors)
4710 break;
4711
c66ac9db 4712 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 4713 if (!task)
c66ac9db
NB		 4714 goto out;
4715
c66ac9db 4716 task->task_lba = lba;
a1d8b49a 4717 task->task_sectors = limited_sectors;
c66ac9db
NB		 4718 lba += task->task_sectors;
4719 sectors -= task->task_sectors;
4720 task->task_size = (task->task_sectors *
e3d6f909 4721 dev->se_sub_dev->se_dev_attrib.block_size);
c66ac9db 4722
e3d6f909 4723 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4724 /* Should be part of task, can't fail */
4725 BUG_ON(!cdb);
4726
4727 memcpy(cdb, cmd->t_task_cdb,
4728 scsi_command_size(cmd->t_task_cdb));
4729
4730 /* Update new cdb with updated lba/sectors */
3a867205 4731 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
c66ac9db
NB		 4732
4733 /*
4734 * Perform the SE OBJ plugin and/or Transport plugin specific
a1d8b49a 4735 * mapping for cmd->t_mem_list. And setup the
c66ac9db
NB		 4736 * task->task_sg and if necessary task->task_sg_bidi
4737 */
4738 ret = transport_do_se_mem_map(dev, task, mem_list,
4739 NULL, se_mem, &se_mem_lout, &se_mem_cnt,
4740 &task_offset_in);
4741 if (ret < 0)
4742 goto out;
4743
4744 se_mem = se_mem_lout;
4745 /*
a1d8b49a 4746 * Setup the cmd->t_mem_bidi_list -> task->task_sg_bidi
c66ac9db
NB		 4747 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI
4748 *
4749 * Note that the first call to transport_do_se_mem_map() above will
4750 * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map()
e3d6f909 4751 * -> transport_init_task_sg(), and the second here will do the
c66ac9db
NB		 4752 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI.
4753 */
4754 if (task->task_sg_bidi != NULL) {
4755 ret = transport_do_se_mem_map(dev, task,
a1d8b49a 4756 &cmd->t_mem_bidi_list, NULL,
c66ac9db
NB		 4757 se_mem_bidi, &se_mem_bidi_lout, &se_mem_bidi_cnt,
4758 &task_offset_in);
4759 if (ret < 0)
4760 goto out;
4761
4762 se_mem_bidi = se_mem_bidi_lout;
4763 }
4764 task_cdbs++;
4765
4766 DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
4767 task_cdbs, task->task_sg_num);
c66ac9db
NB		 4768 }
4769
4770 if (set_counts) {
a1d8b49a
AG		 4771 atomic_inc(&cmd->t_fe_count);
4772 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 4773 }
4774
4775 DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
e3d6f909 4776 cmd->se_tfo->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE)
c66ac9db
NB		 4777 ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs);
4778
4779 return task_cdbs;
4780out:
4781 return 0;
4782}
4783
4784static int
4785transport_map_control_cmd_to_task(struct se_cmd *cmd)
4786{
5951146d 4787 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4788 unsigned char *cdb;
4789 struct se_task *task;
4790 int ret;
4791
4792 task = transport_generic_get_task(cmd, cmd->data_direction);
4793 if (!task)
4794 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4795
e3d6f909 4796 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4797 BUG_ON(!cdb);
4798 memcpy(cdb, cmd->t_task_cdb,
4799 scsi_command_size(cmd->t_task_cdb));
c66ac9db
NB		 4800
4801 task->task_size = cmd->data_length;
4802 task->task_sg_num =
4803 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) ? 1 : 0;
4804
a1d8b49a
AG		 4805 atomic_inc(&cmd->t_fe_count);
4806 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 4807
4808 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
4809 struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
4810 u32 se_mem_cnt = 0, task_offset = 0;
4811
a1d8b49a
AG		 4812 if (!list_empty(&cmd->t_mem_list))
4813 se_mem = list_first_entry(&cmd->t_mem_list,
e63af958 4814 struct se_mem, se_list);
c66ac9db
NB		 4815
4816 ret = transport_do_se_mem_map(dev, task,
a1d8b49a 4817 &cmd->t_mem_list, NULL, se_mem,
c66ac9db
NB		 4818 &se_mem_lout, &se_mem_cnt, &task_offset);
4819 if (ret < 0)
4820 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4821
4822 if (dev->transport->map_task_SG)
4823 return dev->transport->map_task_SG(task);
4824 return 0;
c66ac9db
NB		 4825 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4826 if (dev->transport->cdb_none)
4827 return dev->transport->cdb_none(task);
4828 return 0;
4829 } else {
4830 BUG();
4831 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4832 }
4833}
4834
4835/* transport_generic_new_cmd(): Called from transport_processing_thread()
4836 *
4837 * Allocate storage transport resources from a set of values predefined
4838 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4839 * Any non zero return here is treated as an "out of resource' op here.
4840 */
4841 /*
4842 * Generate struct se_task(s) and/or their payloads for this CDB.
4843 */
a1d8b49a 4844int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4845{
c66ac9db 4846 struct se_task *task;
5951146d 4847 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4848 int ret = 0;
4849
4850 /*
4851 * Determine is the TCM fabric module has already allocated physical
4852 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4853 * to setup beforehand the linked list of physical memory at
a1d8b49a 4854 * cmd->t_mem_list of struct se_mem->se_page
c66ac9db
NB		 4855 */
4856 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
05d1c7c0 4857 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4858 if (ret < 0)
4859 return ret;
4860 }
4861
c66ac9db
NB		 4862 ret = transport_new_cmd_obj(cmd);
4863 if (ret < 0)
4864 return ret;
4865
c66ac9db 4866 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
a1d8b49a 4867 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 4868 if (atomic_read(&task->task_sent))
4869 continue;
4870 if (!dev->transport->map_task_SG)
4871 continue;
4872
4873 ret = dev->transport->map_task_SG(task);
4874 if (ret < 0)
4875 return ret;
4876 }
4877 } else {
4878 ret = transport_map_control_cmd_to_task(cmd);
4879 if (ret < 0)
4880 return ret;
4881 }
4882
4883 /*
a1d8b49a 4884 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4885 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4886 * will be added to the struct se_device execution queue after its WRITE
4887 * data has arrived. (ie: It gets handled by the transport processing
4888 * thread a second time)
4889 */
4890 if (cmd->data_direction == DMA_TO_DEVICE) {
4891 transport_add_tasks_to_state_queue(cmd);
4892 return transport_generic_write_pending(cmd);
4893 }
4894 /*
4895 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4896 * to the execution queue.
4897 */
4898 transport_execute_tasks(cmd);
4899 return 0;
4900}
a1d8b49a 4901EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4902
4903/* transport_generic_process_write():
4904 *
4905 *
4906 */
4907void transport_generic_process_write(struct se_cmd *cmd)
4908{
4909#if 0
4910 /*
4911 * Copy SCSI Presented DTL sector(s) from received buffers allocated to
4912 * original EDTL
4913 */
4914 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
a1d8b49a 4915 if (!cmd->t_tasks_se_num) {
c66ac9db 4916 unsigned char *dst, *buf =
a1d8b49a 4917 (unsigned char *)cmd->t_task_buf;
c66ac9db
NB		 4918
4919 dst = kzalloc(cmd->cmd_spdtl), GFP_KERNEL);
4920 if (!(dst)) {
4921 printk(KERN_ERR "Unable to allocate memory for"
4922 " WRITE underflow\n");
4923 transport_generic_request_failure(cmd, NULL,
4924 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
4925 return;
4926 }
4927 memcpy(dst, buf, cmd->cmd_spdtl);
4928
a1d8b49a
AG		 4929 kfree(cmd->t_task_buf);
4930 cmd->t_task_buf = dst;
c66ac9db
NB		 4931 } else {
4932 struct scatterlist *sg =
a1d8b49a 4933 (struct scatterlist *sg)cmd->t_task_buf;
c66ac9db
NB		 4934 struct scatterlist *orig_sg;
4935
4936 orig_sg = kzalloc(sizeof(struct scatterlist) *
a1d8b49a 4937 cmd->t_tasks_se_num,
c66ac9db
NB		 4938 GFP_KERNEL))) {
4939 if (!(orig_sg)) {
4940 printk(KERN_ERR "Unable to allocate memory"
4941 " for WRITE underflow\n");
4942 transport_generic_request_failure(cmd, NULL,
4943 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
4944 return;
4945 }
4946
a1d8b49a 4947 memcpy(orig_sg, cmd->t_task_buf,
c66ac9db 4948 sizeof(struct scatterlist) *
a1d8b49a 4949 cmd->t_tasks_se_num);
c66ac9db
NB		 4950
4951 cmd->data_length = cmd->cmd_spdtl;
4952 /*
4953 * FIXME, clear out original struct se_task and state
4954 * information.
4955 */
4956 if (transport_generic_new_cmd(cmd) < 0) {
4957 transport_generic_request_failure(cmd, NULL,
4958 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
4959 kfree(orig_sg);
4960 return;
4961 }
4962
4963 transport_memcpy_write_sg(cmd, orig_sg);
4964 }
4965 }
4966#endif
4967 transport_execute_tasks(cmd);
4968}
4969EXPORT_SYMBOL(transport_generic_process_write);
4970
07bde79a
NB		 4971static int transport_write_pending_qf(struct se_cmd *cmd)
4972{
4973 return cmd->se_tfo->write_pending(cmd);
4974}
4975
c66ac9db
NB		 4976/* transport_generic_write_pending():
4977 *
4978 *
4979 */
4980static int transport_generic_write_pending(struct se_cmd *cmd)
4981{
4982 unsigned long flags;
4983 int ret;
4984
a1d8b49a 4985 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4986 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4987 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a
NB		 4988
4989 if (cmd->transport_qf_callback) {
4990 ret = cmd->transport_qf_callback(cmd);
4991 if (ret == -EAGAIN)
4992 goto queue_full;
4993 else if (ret < 0)
4994 return ret;
4995
4996 cmd->transport_qf_callback = NULL;
4997 return 0;
4998 }
05d1c7c0 4999
c66ac9db
NB		 5000 /*
5001 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 5002 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 5003 * can be called from HW target mode interrupt code. This is safe
e3d6f909 5004 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 5005 * because the se_cmd->se_lun pointer is not being cleared.
5006 */
5007 transport_cmd_check_stop(cmd, 1, 0);
5008
5009 /*
5010 * Call the fabric write_pending function here to let the
5011 * frontend know that WRITE buffers are ready.
5012 */
e3d6f909 5013 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 5014 if (ret == -EAGAIN)
5015 goto queue_full;
5016 else if (ret < 0)
c66ac9db
NB		 5017 return ret;
5018
5019 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 5020
5021queue_full:
5022 printk(KERN_INFO "Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
5023 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
5024 transport_handle_queue_full(cmd, cmd->se_dev,
5025 transport_write_pending_qf);
5026 return ret;
c66ac9db
NB		 5027}
5028
35462975 5029void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 5030{
e3d6f909 5031 BUG_ON(!cmd->se_tfo);
c66ac9db
NB		 5032
5033 transport_free_se_cmd(cmd);
35462975 5034 cmd->se_tfo->release_cmd(cmd);
c66ac9db 5035}
35462975 5036EXPORT_SYMBOL(transport_release_cmd);
c66ac9db
NB		 5037
5038/* transport_generic_free_cmd():
5039 *
5040 * Called from processing frontend to release storage engine resources
5041 */
5042void transport_generic_free_cmd(
5043 struct se_cmd *cmd,
5044 int wait_for_tasks,
c66ac9db
NB		 5045 int session_reinstatement)
5046{
5951146d 5047 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
35462975 5048 transport_release_cmd(cmd);
c66ac9db
NB		 5049 else {
5050 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
5051
e3d6f909 5052 if (cmd->se_lun) {
c66ac9db
NB		 5053#if 0
5054 printk(KERN_INFO "cmd: %p ITT: 0x%08x contains"
e3d6f909
AG		 5055 " cmd->se_lun\n", cmd,
5056 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 5057#endif
5058 transport_lun_remove_cmd(cmd);
5059 }
5060
5061 if (wait_for_tasks && cmd->transport_wait_for_tasks)
5062 cmd->transport_wait_for_tasks(cmd, 0, 0);
5063
f4366772
NB		 5064 transport_free_dev_tasks(cmd);
5065
35462975 5066 transport_generic_remove(cmd, session_reinstatement);
c66ac9db
NB		 5067 }
5068}
5069EXPORT_SYMBOL(transport_generic_free_cmd);
5070
5071static void transport_nop_wait_for_tasks(
5072 struct se_cmd *cmd,
5073 int remove_cmd,
5074 int session_reinstatement)
5075{
5076 return;
5077}
5078
5079/* transport_lun_wait_for_tasks():
5080 *
5081 * Called from ConfigFS context to stop the passed struct se_cmd to allow
5082 * an struct se_lun to be successfully shutdown.
5083 */
5084static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
5085{
5086 unsigned long flags;
5087 int ret;
5088 /*
5089 * If the frontend has already requested this struct se_cmd to
5090 * be stopped, we can safely ignore this struct se_cmd.
5091 */
a1d8b49a
AG		 5092 spin_lock_irqsave(&cmd->t_state_lock, flags);
5093 if (atomic_read(&cmd->t_transport_stop)) {
5094 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 5095 DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 5096 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 5097 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 5098 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 5099 return -EPERM;
c66ac9db 5100 }
a1d8b49a
AG		 5101 atomic_set(&cmd->transport_lun_fe_stop, 1);
5102 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 5103
5951146d 5104 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 5105
5106 ret = transport_stop_tasks_for_cmd(cmd);
5107
5108 DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:"
a1d8b49a 5109 " %d\n", cmd, cmd->t_task_cdbs, ret);
c66ac9db
NB		 5110 if (!ret) {
5111 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 5112 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 5113 wait_for_completion(&cmd->transport_lun_stop_comp);
c66ac9db 5114 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 5115 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5116 }
5951146d 5117 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5118
5119 return 0;
5120}
5121
5122/* #define DEBUG_CLEAR_LUN */
5123#ifdef DEBUG_CLEAR_LUN
5124#define DEBUG_CLEAR_L(x...) printk(KERN_INFO x)
5125#else
5126#define DEBUG_CLEAR_L(x...)
5127#endif
5128
5129static void __transport_clear_lun_from_sessions(struct se_lun *lun)
5130{
5131 struct se_cmd *cmd = NULL;
5132 unsigned long lun_flags, cmd_flags;
5133 /*
5134 * Do exception processing and return CHECK_CONDITION status to the
5135 * Initiator Port.
5136 */
5137 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 5138 while (!list_empty(&lun->lun_cmd_list)) {
5139 cmd = list_first_entry(&lun->lun_cmd_list,
5140 struct se_cmd, se_lun_node);
5141 list_del(&cmd->se_lun_node);
5142
a1d8b49a 5143 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 5144 /*
5145 * This will notify iscsi_target_transport.c:
5146 * transport_cmd_check_stop() that a LUN shutdown is in
5147 * progress for the iscsi_cmd_t.
5148 */
a1d8b49a
AG		 5149 spin_lock(&cmd->t_state_lock);
5150 DEBUG_CLEAR_L("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 5151 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 5152 cmd->se_lun->unpacked_lun,
5153 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 5154 atomic_set(&cmd->transport_lun_stop, 1);
5155 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 5156
5157 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5158
e3d6f909 5159 if (!(cmd->se_lun)) {
c66ac9db 5160 printk(KERN_ERR "ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 5161 cmd->se_tfo->get_task_tag(cmd),
5162 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 5163 BUG();
5164 }
5165 /*
5166 * If the Storage engine still owns the iscsi_cmd_t, determine
5167 * and/or stop its context.
5168 */
5169 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 5170 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
5171 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5172
e3d6f909 5173 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 5174 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5175 continue;
5176 }
5177
5178 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
5179 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 5180 cmd->se_lun->unpacked_lun,
5181 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5182
a1d8b49a
AG		 5183 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
5184 if (!(atomic_read(&cmd->transport_dev_active))) {
5185 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 5186 goto check_cond;
5187 }
a1d8b49a 5188 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 5189 transport_all_task_dev_remove_state(cmd);
a1d8b49a 5190 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 5191
5192 transport_free_dev_tasks(cmd);
5193 /*
5194 * The Storage engine stopped this struct se_cmd before it was
5195 * send to the fabric frontend for delivery back to the
5196 * Initiator Node. Return this SCSI CDB back with an
5197 * CHECK_CONDITION status.
5198 */
5199check_cond:
5200 transport_send_check_condition_and_sense(cmd,
5201 TCM_NON_EXISTENT_LUN, 0);
5202 /*
5203 * If the fabric frontend is waiting for this iscsi_cmd_t to
5204 * be released, notify the waiting thread now that LU has
5205 * finished accessing it.
5206 */
a1d8b49a
AG		 5207 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
5208 if (atomic_read(&cmd->transport_lun_fe_stop)) {
c66ac9db
NB		 5209 DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for"
5210 " struct se_cmd: %p ITT: 0x%08x\n",
5211 lun->unpacked_lun,
e3d6f909 5212 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5213
a1d8b49a 5214 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 5215 cmd_flags);
5216 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 5217 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 5218 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5219 continue;
5220 }
5221 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 5222 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5223
a1d8b49a 5224 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 5225 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5226 }
5227 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5228}
5229
5230static int transport_clear_lun_thread(void *p)
5231{
5232 struct se_lun *lun = (struct se_lun *)p;
5233
5234 __transport_clear_lun_from_sessions(lun);
5235 complete(&lun->lun_shutdown_comp);
5236
5237 return 0;
5238}
5239
5240int transport_clear_lun_from_sessions(struct se_lun *lun)
5241{
5242 struct task_struct *kt;
5243
5951146d 5244 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 5245 "tcm_cl_%u", lun->unpacked_lun);
5246 if (IS_ERR(kt)) {
5247 printk(KERN_ERR "Unable to start clear_lun thread\n");
e3d6f909 5248 return PTR_ERR(kt);
c66ac9db
NB		 5249 }
5250 wait_for_completion(&lun->lun_shutdown_comp);
5251
5252 return 0;
5253}
5254
5255/* transport_generic_wait_for_tasks():
5256 *
5257 * Called from frontend or passthrough context to wait for storage engine
5258 * to pause and/or release frontend generated struct se_cmd.
5259 */
5260static void transport_generic_wait_for_tasks(
5261 struct se_cmd *cmd,
5262 int remove_cmd,
5263 int session_reinstatement)
5264{
5265 unsigned long flags;
5266
5267 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
5268 return;
5269
a1d8b49a 5270 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 5271 /*
5272 * If we are already stopped due to an external event (ie: LUN shutdown)
5273 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 5274 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 5275 * transport_clear_lun_from_sessions() once the ConfigFS context caller
5276 * has completed its operation on the struct se_cmd.
5277 */
a1d8b49a 5278 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db
NB		 5279
5280 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping"
e3d6f909 5281 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 5282 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 5283 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 5284 /*
5285 * There is a special case for WRITES where a FE exception +
5286 * LUN shutdown means ConfigFS context is still sleeping on
5287 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
5288 * We go ahead and up transport_lun_stop_comp just to be sure
5289 * here.
5290 */
a1d8b49a
AG		 5291 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
5292 complete(&cmd->transport_lun_stop_comp);
5293 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
5294 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 5295
5296 transport_all_task_dev_remove_state(cmd);
5297 /*
5298 * At this point, the frontend who was the originator of this
5299 * struct se_cmd, now owns the structure and can be released through
5300 * normal means below.
5301 */
5302 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped"
e3d6f909 5303 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 5304 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 5305 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5306
a1d8b49a 5307 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 5308 }
a1d8b49a
AG		 5309 if (!atomic_read(&cmd->t_transport_active) ||
5310 atomic_read(&cmd->t_transport_aborted))
c66ac9db
NB		 5311 goto remove;
5312
a1d8b49a 5313 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db
NB		 5314
5315 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x"
5316 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 5317 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
5318 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 5319 cmd->deferred_t_state);
5320
a1d8b49a 5321 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 5322
5951146d 5323 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 5324
a1d8b49a 5325 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 5326
a1d8b49a
AG		 5327 spin_lock_irqsave(&cmd->t_state_lock, flags);
5328 atomic_set(&cmd->t_transport_active, 0);
5329 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db
NB		 5330
5331 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 5332 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 5333 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5334remove:
a1d8b49a 5335 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 5336 if (!remove_cmd)
5337 return;
5338
35462975 5339 transport_generic_free_cmd(cmd, 0, session_reinstatement);
c66ac9db
NB		 5340}
5341
5342static int transport_get_sense_codes(
5343 struct se_cmd *cmd,
5344 u8 *asc,
5345 u8 *ascq)
5346{
5347 *asc = cmd->scsi_asc;
5348 *ascq = cmd->scsi_ascq;
5349
5350 return 0;
5351}
5352
5353static int transport_set_sense_codes(
5354 struct se_cmd *cmd,
5355 u8 asc,
5356 u8 ascq)
5357{
5358 cmd->scsi_asc = asc;
5359 cmd->scsi_ascq = ascq;
5360
5361 return 0;
5362}
5363
5364int transport_send_check_condition_and_sense(
5365 struct se_cmd *cmd,
5366 u8 reason,
5367 int from_transport)
5368{
5369 unsigned char *buffer = cmd->sense_buffer;
5370 unsigned long flags;
5371 int offset;
5372 u8 asc = 0, ascq = 0;
5373
a1d8b49a 5374 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 5375 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 5376 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 5377 return 0;
5378 }
5379 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 5380 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 5381
5382 if (!reason && from_transport)
5383 goto after_reason;
5384
5385 if (!from_transport)
5386 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
5387 /*
5388 * Data Segment and SenseLength of the fabric response PDU.
5389 *
5390 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
5391 * from include/scsi/scsi_cmnd.h
5392 */
e3d6f909 5393 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 5394 TRANSPORT_SENSE_BUFFER);
5395 /*
5396 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
5397 * SENSE KEY values from include/scsi/scsi.h
5398 */
5399 switch (reason) {
5400 case TCM_NON_EXISTENT_LUN:
5401 case TCM_UNSUPPORTED_SCSI_OPCODE:
5402 case TCM_SECTOR_COUNT_TOO_MANY:
5403 /* CURRENT ERROR */
5404 buffer[offset] = 0x70;
5405 /* ILLEGAL REQUEST */
5406 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5407 /* INVALID COMMAND OPERATION CODE */
5408 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
5409 break;
5410 case TCM_UNKNOWN_MODE_PAGE:
5411 /* CURRENT ERROR */
5412 buffer[offset] = 0x70;
5413 /* ILLEGAL REQUEST */
5414 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5415 /* INVALID FIELD IN CDB */
5416 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5417 break;
5418 case TCM_CHECK_CONDITION_ABORT_CMD:
5419 /* CURRENT ERROR */
5420 buffer[offset] = 0x70;
5421 /* ABORTED COMMAND */
5422 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5423 /* BUS DEVICE RESET FUNCTION OCCURRED */
5424 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
5425 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
5426 break;
5427 case TCM_INCORRECT_AMOUNT_OF_DATA:
5428 /* CURRENT ERROR */
5429 buffer[offset] = 0x70;
5430 /* ABORTED COMMAND */
5431 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5432 /* WRITE ERROR */
5433 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5434 /* NOT ENOUGH UNSOLICITED DATA */
5435 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
5436 break;
5437 case TCM_INVALID_CDB_FIELD:
5438 /* CURRENT ERROR */
5439 buffer[offset] = 0x70;
5440 /* ABORTED COMMAND */
5441 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5442 /* INVALID FIELD IN CDB */
5443 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5444 break;
5445 case TCM_INVALID_PARAMETER_LIST:
5446 /* CURRENT ERROR */
5447 buffer[offset] = 0x70;
5448 /* ABORTED COMMAND */
5449 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5450 /* INVALID FIELD IN PARAMETER LIST */
5451 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
5452 break;
5453 case TCM_UNEXPECTED_UNSOLICITED_DATA:
5454 /* CURRENT ERROR */
5455 buffer[offset] = 0x70;
5456 /* ABORTED COMMAND */
5457 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5458 /* WRITE ERROR */
5459 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5460 /* UNEXPECTED_UNSOLICITED_DATA */
5461 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
5462 break;
5463 case TCM_SERVICE_CRC_ERROR:
5464 /* CURRENT ERROR */
5465 buffer[offset] = 0x70;
5466 /* ABORTED COMMAND */
5467 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5468 /* PROTOCOL SERVICE CRC ERROR */
5469 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
5470 /* N/A */
5471 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
5472 break;
5473 case TCM_SNACK_REJECTED:
5474 /* CURRENT ERROR */
5475 buffer[offset] = 0x70;
5476 /* ABORTED COMMAND */
5477 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5478 /* READ ERROR */
5479 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
5480 /* FAILED RETRANSMISSION REQUEST */
5481 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
5482 break;
5483 case TCM_WRITE_PROTECTED:
5484 /* CURRENT ERROR */
5485 buffer[offset] = 0x70;
5486 /* DATA PROTECT */
5487 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
5488 /* WRITE PROTECTED */
5489 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
5490 break;
5491 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
5492 /* CURRENT ERROR */
5493 buffer[offset] = 0x70;
5494 /* UNIT ATTENTION */
5495 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
5496 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
5497 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5498 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5499 break;
5500 case TCM_CHECK_CONDITION_NOT_READY:
5501 /* CURRENT ERROR */
5502 buffer[offset] = 0x70;
5503 /* Not Ready */
5504 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
5505 transport_get_sense_codes(cmd, &asc, &ascq);
5506 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5507 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5508 break;
5509 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
5510 default:
5511 /* CURRENT ERROR */
5512 buffer[offset] = 0x70;
5513 /* ILLEGAL REQUEST */
5514 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5515 /* LOGICAL UNIT COMMUNICATION FAILURE */
5516 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
5517 break;
5518 }
5519 /*
5520 * This code uses linux/include/scsi/scsi.h SAM status codes!
5521 */
5522 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
5523 /*
5524 * Automatically padded, this value is encoded in the fabric's
5525 * data_length response PDU containing the SCSI defined sense data.
5526 */
5527 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
5528
5529after_reason:
07bde79a 5530 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 5531}
5532EXPORT_SYMBOL(transport_send_check_condition_and_sense);
5533
5534int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
5535{
5536 int ret = 0;
5537
a1d8b49a 5538 if (atomic_read(&cmd->t_transport_aborted) != 0) {
c66ac9db
NB		 5539 if (!(send_status) ||
5540 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
5541 return 1;
5542#if 0
5543 printk(KERN_INFO "Sending delayed SAM_STAT_TASK_ABORTED"
5544 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 5545 cmd->t_task_cdb[0],
e3d6f909 5546 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 5547#endif
5548 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 5549 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 5550 ret = 1;
5551 }
5552 return ret;
5553}
5554EXPORT_SYMBOL(transport_check_aborted_status);
5555
5556void transport_send_task_abort(struct se_cmd *cmd)
5557{
5558 /*
5559 * If there are still expected incoming fabric WRITEs, we wait
5560 * until until they have completed before sending a TASK_ABORTED
5561 * response. This response with TASK_ABORTED status will be
5562 * queued back to fabric module by transport_check_aborted_status().
5563 */
5564 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 5565 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 5566 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 5567 smp_mb__after_atomic_inc();
5568 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5569 transport_new_cmd_failure(cmd);
5570 return;
5571 }
5572 }
5573 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5574#if 0
5575 printk(KERN_INFO "Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 5576 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 5577 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5578#endif
e3d6f909 5579 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 5580}
5581
5582/* transport_generic_do_tmr():
5583 *
5584 *
5585 */
5586int transport_generic_do_tmr(struct se_cmd *cmd)
5587{
5951146d 5588 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 5589 struct se_tmr_req *tmr = cmd->se_tmr_req;
5590 int ret;
5591
5592 switch (tmr->function) {
5c6cd613 5593 case TMR_ABORT_TASK:
c66ac9db
NB		 5594 tmr->response = TMR_FUNCTION_REJECTED;
5595 break;
5c6cd613
NB		 5596 case TMR_ABORT_TASK_SET:
5597 case TMR_CLEAR_ACA:
5598 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 5599 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
5600 break;
5c6cd613 5601 case TMR_LUN_RESET:
c66ac9db
NB		 5602 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
5603 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
5604 TMR_FUNCTION_REJECTED;
5605 break;
5c6cd613 5606 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 5607 tmr->response = TMR_FUNCTION_REJECTED;
5608 break;
5c6cd613 5609 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 5610 tmr->response = TMR_FUNCTION_REJECTED;
5611 break;
c66ac9db
NB		 5612 default:
5613 printk(KERN_ERR "Uknown TMR function: 0x%02x.\n",
5614 tmr->function);
5615 tmr->response = TMR_FUNCTION_REJECTED;
5616 break;
5617 }
5618
5619 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 5620 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 5621
5622 transport_cmd_check_stop(cmd, 2, 0);
5623 return 0;
5624}
5625
5626/*
5627 * Called with spin_lock_irq(&dev->execute_task_lock); held
5628 *
5629 */
5630static struct se_task *
5631transport_get_task_from_state_list(struct se_device *dev)
5632{
5633 struct se_task *task;
5634
5635 if (list_empty(&dev->state_task_list))
5636 return NULL;
5637
5638 list_for_each_entry(task, &dev->state_task_list, t_state_list)
5639 break;
5640
5641 list_del(&task->t_state_list);
5642 atomic_set(&task->task_state_active, 0);
5643
5644 return task;
5645}
5646
5647static void transport_processing_shutdown(struct se_device *dev)
5648{
5649 struct se_cmd *cmd;
c66ac9db 5650 struct se_task *task;
c66ac9db
NB		 5651 unsigned long flags;
5652 /*
5653 * Empty the struct se_device's struct se_task state list.
5654 */
5655 spin_lock_irqsave(&dev->execute_task_lock, flags);
5656 while ((task = transport_get_task_from_state_list(dev))) {
e3d6f909
AG		 5657 if (!task->task_se_cmd) {
5658 printk(KERN_ERR "task->task_se_cmd is NULL!\n");
c66ac9db
NB		 5659 continue;
5660 }
e3d6f909 5661 cmd = task->task_se_cmd;
c66ac9db 5662
c66ac9db
NB		 5663 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5664
a1d8b49a 5665 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 5666
5667 DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x,"
5668 " i_state/def_i_state: %d/%d, t_state/def_t_state:"
5669 " %d/%d cdb: 0x%02x\n", cmd, task,
e3d6f909
AG		 5670 cmd->se_tfo->get_task_tag(cmd), cmd->cmd_sn,
5671 cmd->se_tfo->get_cmd_state(cmd), cmd->deferred_i_state,
c66ac9db 5672 cmd->t_state, cmd->deferred_t_state,
a1d8b49a 5673 cmd->t_task_cdb[0]);
c66ac9db
NB		 5674 DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:"
5675 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5676 " t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909 5677 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a
AG		 5678 cmd->t_task_cdbs,
5679 atomic_read(&cmd->t_task_cdbs_left),
5680 atomic_read(&cmd->t_task_cdbs_sent),
5681 atomic_read(&cmd->t_transport_active),
5682 atomic_read(&cmd->t_transport_stop),
5683 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 5684
5685 if (atomic_read(&task->task_active)) {
5686 atomic_set(&task->task_stop, 1);
5687 spin_unlock_irqrestore(
a1d8b49a 5688 &cmd->t_state_lock, flags);
c66ac9db
NB		 5689
5690 DEBUG_DO("Waiting for task: %p to shutdown for dev:"
5691 " %p\n", task, dev);
5692 wait_for_completion(&task->task_stop_comp);
5693 DEBUG_DO("Completed task: %p shutdown for dev: %p\n",
5694 task, dev);
5695
a1d8b49a
AG		 5696 spin_lock_irqsave(&cmd->t_state_lock, flags);
5697 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 5698
5699 atomic_set(&task->task_active, 0);
5700 atomic_set(&task->task_stop, 0);
52208ae3
NB		 5701 } else {
5702 if (atomic_read(&task->task_execute_queue) != 0)
5703 transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 5704 }
5705 __transport_stop_task_timer(task, &flags);
5706
a1d8b49a 5707 if (!(atomic_dec_and_test(&cmd->t_task_cdbs_ex_left))) {
c66ac9db 5708 spin_unlock_irqrestore(
a1d8b49a 5709 &cmd->t_state_lock, flags);
c66ac9db
NB		 5710
5711 DEBUG_DO("Skipping task: %p, dev: %p for"
5712 " t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a 5713 atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db
NB		 5714
5715 spin_lock_irqsave(&dev->execute_task_lock, flags);
5716 continue;
5717 }
5718
a1d8b49a 5719 if (atomic_read(&cmd->t_transport_active)) {
c66ac9db
NB		 5720 DEBUG_DO("got t_transport_active = 1 for task: %p, dev:"
5721 " %p\n", task, dev);
5722
a1d8b49a 5723 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5724 spin_unlock_irqrestore(
a1d8b49a 5725 &cmd->t_state_lock, flags);
c66ac9db
NB		 5726 transport_send_check_condition_and_sense(
5727 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5728 0);
5729 transport_remove_cmd_from_queue(cmd,
5951146d 5730 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5731
5732 transport_lun_remove_cmd(cmd);
5733 transport_cmd_check_stop(cmd, 1, 0);
5734 } else {
5735 spin_unlock_irqrestore(
a1d8b49a 5736 &cmd->t_state_lock, flags);
c66ac9db
NB		 5737
5738 transport_remove_cmd_from_queue(cmd,
5951146d 5739 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5740
5741 transport_lun_remove_cmd(cmd);
5742
5743 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5744 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5745 }
5746
5747 spin_lock_irqsave(&dev->execute_task_lock, flags);
5748 continue;
5749 }
5750 DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n",
5751 task, dev);
5752
a1d8b49a 5753 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5754 spin_unlock_irqrestore(
a1d8b49a 5755 &cmd->t_state_lock, flags);
c66ac9db
NB		 5756 transport_send_check_condition_and_sense(cmd,
5757 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5758 transport_remove_cmd_from_queue(cmd,
5951146d 5759 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5760
5761 transport_lun_remove_cmd(cmd);
5762 transport_cmd_check_stop(cmd, 1, 0);
5763 } else {
5764 spin_unlock_irqrestore(
a1d8b49a 5765 &cmd->t_state_lock, flags);
c66ac9db
NB		 5766
5767 transport_remove_cmd_from_queue(cmd,
5951146d 5768 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5769 transport_lun_remove_cmd(cmd);
5770
5771 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5772 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5773 }
5774
5775 spin_lock_irqsave(&dev->execute_task_lock, flags);
5776 }
5777 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5778 /*
5779 * Empty the struct se_device's struct se_cmd list.
5780 */
5951146d 5781 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
c66ac9db
NB		 5782
5783 DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n",
5951146d 5784 cmd, cmd->t_state);
c66ac9db 5785
a1d8b49a 5786 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db
NB		 5787 transport_send_check_condition_and_sense(cmd,
5788 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5789
5790 transport_lun_remove_cmd(cmd);
5791 transport_cmd_check_stop(cmd, 1, 0);
5792 } else {
5793 transport_lun_remove_cmd(cmd);
5794 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5795 transport_generic_remove(cmd, 0);
c66ac9db 5796 }
c66ac9db 5797 }
c66ac9db
NB		 5798}
5799
5800/* transport_processing_thread():
5801 *
5802 *
5803 */
5804static int transport_processing_thread(void *param)
5805{
5951146d 5806 int ret;
c66ac9db
NB		 5807 struct se_cmd *cmd;
5808 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 5809
5810 set_user_nice(current, -20);
5811
5812 while (!kthread_should_stop()) {
e3d6f909
AG		 5813 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5814 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 5815 kthread_should_stop());
5816 if (ret < 0)
5817 goto out;
5818
5819 spin_lock_irq(&dev->dev_status_lock);
5820 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5821 spin_unlock_irq(&dev->dev_status_lock);
5822 transport_processing_shutdown(dev);
5823 continue;
5824 }
5825 spin_unlock_irq(&dev->dev_status_lock);
5826
5827get_cmd:
5828 __transport_execute_tasks(dev);
5829
5951146d
AG		 5830 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5831 if (!cmd)
c66ac9db
NB		 5832 continue;
5833
5951146d 5834 switch (cmd->t_state) {
c66ac9db 5835 case TRANSPORT_NEW_CMD_MAP:
e3d6f909
AG		 5836 if (!(cmd->se_tfo->new_cmd_map)) {
5837 printk(KERN_ERR "cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 5838 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5839 BUG();
5840 }
e3d6f909 5841 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 5842 if (ret < 0) {
5843 cmd->transport_error_status = ret;
5844 transport_generic_request_failure(cmd, NULL,
5845 0, (cmd->data_direction !=
5846 DMA_TO_DEVICE));
5847 break;
5848 }
5849 /* Fall through */
5850 case TRANSPORT_NEW_CMD:
5851 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 5852 if (ret == -EAGAIN)
5853 break;
5854 else if (ret < 0) {
c66ac9db
NB		 5855 cmd->transport_error_status = ret;
5856 transport_generic_request_failure(cmd, NULL,
5857 0, (cmd->data_direction !=
5858 DMA_TO_DEVICE));
5859 }
5860 break;
5861 case TRANSPORT_PROCESS_WRITE:
5862 transport_generic_process_write(cmd);
5863 break;
5864 case TRANSPORT_COMPLETE_OK:
5865 transport_stop_all_task_timers(cmd);
5866 transport_generic_complete_ok(cmd);
5867 break;
5868 case TRANSPORT_REMOVE:
35462975 5869 transport_generic_remove(cmd, 0);
c66ac9db 5870 break;
f4366772 5871 case TRANSPORT_FREE_CMD_INTR:
35462975 5872 transport_generic_free_cmd(cmd, 0, 0);
f4366772 5873 break;
c66ac9db
NB		 5874 case TRANSPORT_PROCESS_TMR:
5875 transport_generic_do_tmr(cmd);
5876 break;
5877 case TRANSPORT_COMPLETE_FAILURE:
5878 transport_generic_request_failure(cmd, NULL, 1, 1);
5879 break;
5880 case TRANSPORT_COMPLETE_TIMEOUT:
5881 transport_stop_all_task_timers(cmd);
5882 transport_generic_request_timeout(cmd);
5883 break;
07bde79a
NB		 5884 case TRANSPORT_COMPLETE_QF_WP:
5885 transport_generic_write_pending(cmd);
5886 break;
c66ac9db
NB		 5887 default:
5888 printk(KERN_ERR "Unknown t_state: %d deferred_t_state:"
5889 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 5890 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 5891 cmd->se_tfo->get_task_tag(cmd),
5892 cmd->se_tfo->get_cmd_state(cmd),
5893 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 5894 BUG();
5895 }
5896
5897 goto get_cmd;
5898 }
5899
5900out:
5901 transport_release_all_cmds(dev);
5902 dev->process_thread = NULL;
5903 return 0;
5904}
Linux 6.x block layer and io_uring tree(s)