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xhci: Add completion code to the debug ouput of unhandled transfer events
[deliverable/linux.git] / drivers / target / target_core_transport.c
1 /*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * (c) Copyright 2002-2013 Datera, Inc.
7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/slab.h>
31 #include <linux/spinlock.h>
32 #include <linux/kthread.h>
33 #include <linux/in.h>
34 #include <linux/cdrom.h>
35 #include <linux/module.h>
36 #include <linux/ratelimit.h>
37 #include <asm/unaligned.h>
38 #include <net/sock.h>
39 #include <net/tcp.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_tcq.h>
43
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47 #include <target/target_core_configfs.h>
48
49 #include "target_core_internal.h"
50 #include "target_core_alua.h"
51 #include "target_core_pr.h"
52 #include "target_core_ua.h"
53
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/target.h>
56
57 static struct workqueue_struct *target_completion_wq;
58 static struct kmem_cache *se_sess_cache;
59 struct kmem_cache *se_ua_cache;
60 struct kmem_cache *t10_pr_reg_cache;
61 struct kmem_cache *t10_alua_lu_gp_cache;
62 struct kmem_cache *t10_alua_lu_gp_mem_cache;
63 struct kmem_cache *t10_alua_tg_pt_gp_cache;
64 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
65 struct kmem_cache *t10_alua_lba_map_cache;
66 struct kmem_cache *t10_alua_lba_map_mem_cache;
67
68 static void transport_complete_task_attr(struct se_cmd *cmd);
69 static void transport_handle_queue_full(struct se_cmd *cmd,
70 struct se_device *dev);
71 static int transport_put_cmd(struct se_cmd *cmd);
72 static void target_complete_ok_work(struct work_struct *work);
73
74 int init_se_kmem_caches(void)
75 {
76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
78 0, NULL);
79 if (!se_sess_cache) {
80 pr_err("kmem_cache_create() for struct se_session"
81 " failed\n");
82 goto out;
83 }
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
86 0, NULL);
87 if (!se_ua_cache) {
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
89 goto out_free_sess_cache;
90 }
91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
96 " failed\n");
97 goto out_free_ua_cache;
98 }
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 0, NULL);
102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
104 " failed\n");
105 goto out_free_pr_reg_cache;
106 }
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
112 "cache failed\n");
113 goto out_free_lu_gp_cache;
114 }
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
120 "cache failed\n");
121 goto out_free_lu_gp_mem_cache;
122 }
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
127 0, NULL);
128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
130 "mem_t failed\n");
131 goto out_free_tg_pt_gp_cache;
132 }
133 t10_alua_lba_map_cache = kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map),
136 __alignof__(struct t10_alua_lba_map), 0, NULL);
137 if (!t10_alua_lba_map_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
139 "cache failed\n");
140 goto out_free_tg_pt_gp_mem_cache;
141 }
142 t10_alua_lba_map_mem_cache = kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member),
145 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
146 if (!t10_alua_lba_map_mem_cache) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
148 "cache failed\n");
149 goto out_free_lba_map_cache;
150 }
151
152 target_completion_wq = alloc_workqueue("target_completion",
153 WQ_MEM_RECLAIM, 0);
154 if (!target_completion_wq)
155 goto out_free_lba_map_mem_cache;
156
157 return 0;
158
159 out_free_lba_map_mem_cache:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
161 out_free_lba_map_cache:
162 kmem_cache_destroy(t10_alua_lba_map_cache);
163 out_free_tg_pt_gp_mem_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
165 out_free_tg_pt_gp_cache:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167 out_free_lu_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169 out_free_lu_gp_cache:
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171 out_free_pr_reg_cache:
172 kmem_cache_destroy(t10_pr_reg_cache);
173 out_free_ua_cache:
174 kmem_cache_destroy(se_ua_cache);
175 out_free_sess_cache:
176 kmem_cache_destroy(se_sess_cache);
177 out:
178 return -ENOMEM;
179 }
180
181 void release_se_kmem_caches(void)
182 {
183 destroy_workqueue(target_completion_wq);
184 kmem_cache_destroy(se_sess_cache);
185 kmem_cache_destroy(se_ua_cache);
186 kmem_cache_destroy(t10_pr_reg_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
191 kmem_cache_destroy(t10_alua_lba_map_cache);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
193 }
194
195 /* This code ensures unique mib indexes are handed out. */
196 static DEFINE_SPINLOCK(scsi_mib_index_lock);
197 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
198
199 /*
200 * Allocate a new row index for the entry type specified
201 */
202 u32 scsi_get_new_index(scsi_index_t type)
203 {
204 u32 new_index;
205
206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
207
208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
211
212 return new_index;
213 }
214
215 void transport_subsystem_check_init(void)
216 {
217 int ret;
218 static int sub_api_initialized;
219
220 if (sub_api_initialized)
221 return;
222
223 ret = request_module("target_core_iblock");
224 if (ret != 0)
225 pr_err("Unable to load target_core_iblock\n");
226
227 ret = request_module("target_core_file");
228 if (ret != 0)
229 pr_err("Unable to load target_core_file\n");
230
231 ret = request_module("target_core_pscsi");
232 if (ret != 0)
233 pr_err("Unable to load target_core_pscsi\n");
234
235 ret = request_module("target_core_user");
236 if (ret != 0)
237 pr_err("Unable to load target_core_user\n");
238
239 sub_api_initialized = 1;
240 }
241
242 struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
243 {
244 struct se_session *se_sess;
245
246 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
247 if (!se_sess) {
248 pr_err("Unable to allocate struct se_session from"
249 " se_sess_cache\n");
250 return ERR_PTR(-ENOMEM);
251 }
252 INIT_LIST_HEAD(&se_sess->sess_list);
253 INIT_LIST_HEAD(&se_sess->sess_acl_list);
254 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
255 INIT_LIST_HEAD(&se_sess->sess_wait_list);
256 spin_lock_init(&se_sess->sess_cmd_lock);
257 kref_init(&se_sess->sess_kref);
258 se_sess->sup_prot_ops = sup_prot_ops;
259
260 return se_sess;
261 }
262 EXPORT_SYMBOL(transport_init_session);
263
264 int transport_alloc_session_tags(struct se_session *se_sess,
265 unsigned int tag_num, unsigned int tag_size)
266 {
267 int rc;
268
269 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
270 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
271 if (!se_sess->sess_cmd_map) {
272 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
273 if (!se_sess->sess_cmd_map) {
274 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
275 return -ENOMEM;
276 }
277 }
278
279 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
280 if (rc < 0) {
281 pr_err("Unable to init se_sess->sess_tag_pool,"
282 " tag_num: %u\n", tag_num);
283 if (is_vmalloc_addr(se_sess->sess_cmd_map))
284 vfree(se_sess->sess_cmd_map);
285 else
286 kfree(se_sess->sess_cmd_map);
287 se_sess->sess_cmd_map = NULL;
288 return -ENOMEM;
289 }
290
291 return 0;
292 }
293 EXPORT_SYMBOL(transport_alloc_session_tags);
294
295 struct se_session *transport_init_session_tags(unsigned int tag_num,
296 unsigned int tag_size,
297 enum target_prot_op sup_prot_ops)
298 {
299 struct se_session *se_sess;
300 int rc;
301
302 se_sess = transport_init_session(sup_prot_ops);
303 if (IS_ERR(se_sess))
304 return se_sess;
305
306 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
307 if (rc < 0) {
308 transport_free_session(se_sess);
309 return ERR_PTR(-ENOMEM);
310 }
311
312 return se_sess;
313 }
314 EXPORT_SYMBOL(transport_init_session_tags);
315
316 /*
317 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
318 */
319 void __transport_register_session(
320 struct se_portal_group *se_tpg,
321 struct se_node_acl *se_nacl,
322 struct se_session *se_sess,
323 void *fabric_sess_ptr)
324 {
325 unsigned char buf[PR_REG_ISID_LEN];
326
327 se_sess->se_tpg = se_tpg;
328 se_sess->fabric_sess_ptr = fabric_sess_ptr;
329 /*
330 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
331 *
332 * Only set for struct se_session's that will actually be moving I/O.
333 * eg: *NOT* discovery sessions.
334 */
335 if (se_nacl) {
336 /*
337 * If the fabric module supports an ISID based TransportID,
338 * save this value in binary from the fabric I_T Nexus now.
339 */
340 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
341 memset(&buf[0], 0, PR_REG_ISID_LEN);
342 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
343 &buf[0], PR_REG_ISID_LEN);
344 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
345 }
346 kref_get(&se_nacl->acl_kref);
347
348 spin_lock_irq(&se_nacl->nacl_sess_lock);
349 /*
350 * The se_nacl->nacl_sess pointer will be set to the
351 * last active I_T Nexus for each struct se_node_acl.
352 */
353 se_nacl->nacl_sess = se_sess;
354
355 list_add_tail(&se_sess->sess_acl_list,
356 &se_nacl->acl_sess_list);
357 spin_unlock_irq(&se_nacl->nacl_sess_lock);
358 }
359 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
360
361 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
362 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
363 }
364 EXPORT_SYMBOL(__transport_register_session);
365
366 void transport_register_session(
367 struct se_portal_group *se_tpg,
368 struct se_node_acl *se_nacl,
369 struct se_session *se_sess,
370 void *fabric_sess_ptr)
371 {
372 unsigned long flags;
373
374 spin_lock_irqsave(&se_tpg->session_lock, flags);
375 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
376 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
377 }
378 EXPORT_SYMBOL(transport_register_session);
379
380 static void target_release_session(struct kref *kref)
381 {
382 struct se_session *se_sess = container_of(kref,
383 struct se_session, sess_kref);
384 struct se_portal_group *se_tpg = se_sess->se_tpg;
385
386 se_tpg->se_tpg_tfo->close_session(se_sess);
387 }
388
389 void target_get_session(struct se_session *se_sess)
390 {
391 kref_get(&se_sess->sess_kref);
392 }
393 EXPORT_SYMBOL(target_get_session);
394
395 void target_put_session(struct se_session *se_sess)
396 {
397 struct se_portal_group *tpg = se_sess->se_tpg;
398
399 if (tpg->se_tpg_tfo->put_session != NULL) {
400 tpg->se_tpg_tfo->put_session(se_sess);
401 return;
402 }
403 kref_put(&se_sess->sess_kref, target_release_session);
404 }
405 EXPORT_SYMBOL(target_put_session);
406
407 static void target_complete_nacl(struct kref *kref)
408 {
409 struct se_node_acl *nacl = container_of(kref,
410 struct se_node_acl, acl_kref);
411
412 complete(&nacl->acl_free_comp);
413 }
414
415 void target_put_nacl(struct se_node_acl *nacl)
416 {
417 kref_put(&nacl->acl_kref, target_complete_nacl);
418 }
419
420 void transport_deregister_session_configfs(struct se_session *se_sess)
421 {
422 struct se_node_acl *se_nacl;
423 unsigned long flags;
424 /*
425 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
426 */
427 se_nacl = se_sess->se_node_acl;
428 if (se_nacl) {
429 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
430 if (se_nacl->acl_stop == 0)
431 list_del(&se_sess->sess_acl_list);
432 /*
433 * If the session list is empty, then clear the pointer.
434 * Otherwise, set the struct se_session pointer from the tail
435 * element of the per struct se_node_acl active session list.
436 */
437 if (list_empty(&se_nacl->acl_sess_list))
438 se_nacl->nacl_sess = NULL;
439 else {
440 se_nacl->nacl_sess = container_of(
441 se_nacl->acl_sess_list.prev,
442 struct se_session, sess_acl_list);
443 }
444 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
445 }
446 }
447 EXPORT_SYMBOL(transport_deregister_session_configfs);
448
449 void transport_free_session(struct se_session *se_sess)
450 {
451 if (se_sess->sess_cmd_map) {
452 percpu_ida_destroy(&se_sess->sess_tag_pool);
453 if (is_vmalloc_addr(se_sess->sess_cmd_map))
454 vfree(se_sess->sess_cmd_map);
455 else
456 kfree(se_sess->sess_cmd_map);
457 }
458 kmem_cache_free(se_sess_cache, se_sess);
459 }
460 EXPORT_SYMBOL(transport_free_session);
461
462 void transport_deregister_session(struct se_session *se_sess)
463 {
464 struct se_portal_group *se_tpg = se_sess->se_tpg;
465 struct target_core_fabric_ops *se_tfo;
466 struct se_node_acl *se_nacl;
467 unsigned long flags;
468 bool comp_nacl = true;
469
470 if (!se_tpg) {
471 transport_free_session(se_sess);
472 return;
473 }
474 se_tfo = se_tpg->se_tpg_tfo;
475
476 spin_lock_irqsave(&se_tpg->session_lock, flags);
477 list_del(&se_sess->sess_list);
478 se_sess->se_tpg = NULL;
479 se_sess->fabric_sess_ptr = NULL;
480 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
481
482 /*
483 * Determine if we need to do extra work for this initiator node's
484 * struct se_node_acl if it had been previously dynamically generated.
485 */
486 se_nacl = se_sess->se_node_acl;
487
488 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
489 if (se_nacl && se_nacl->dynamic_node_acl) {
490 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
491 list_del(&se_nacl->acl_list);
492 se_tpg->num_node_acls--;
493 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
494 core_tpg_wait_for_nacl_pr_ref(se_nacl);
495 core_free_device_list_for_node(se_nacl, se_tpg);
496 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
497
498 comp_nacl = false;
499 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
500 }
501 }
502 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
503
504 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
505 se_tpg->se_tpg_tfo->get_fabric_name());
506 /*
507 * If last kref is dropping now for an explicit NodeACL, awake sleeping
508 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
509 * removal context.
510 */
511 if (se_nacl && comp_nacl)
512 target_put_nacl(se_nacl);
513
514 transport_free_session(se_sess);
515 }
516 EXPORT_SYMBOL(transport_deregister_session);
517
518 /*
519 * Called with cmd->t_state_lock held.
520 */
521 static void target_remove_from_state_list(struct se_cmd *cmd)
522 {
523 struct se_device *dev = cmd->se_dev;
524 unsigned long flags;
525
526 if (!dev)
527 return;
528
529 if (cmd->transport_state & CMD_T_BUSY)
530 return;
531
532 spin_lock_irqsave(&dev->execute_task_lock, flags);
533 if (cmd->state_active) {
534 list_del(&cmd->state_list);
535 cmd->state_active = false;
536 }
537 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
538 }
539
540 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
541 bool write_pending)
542 {
543 unsigned long flags;
544
545 spin_lock_irqsave(&cmd->t_state_lock, flags);
546 if (write_pending)
547 cmd->t_state = TRANSPORT_WRITE_PENDING;
548
549 if (remove_from_lists) {
550 target_remove_from_state_list(cmd);
551
552 /*
553 * Clear struct se_cmd->se_lun before the handoff to FE.
554 */
555 cmd->se_lun = NULL;
556 }
557
558 /*
559 * Determine if frontend context caller is requesting the stopping of
560 * this command for frontend exceptions.
561 */
562 if (cmd->transport_state & CMD_T_STOP) {
563 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
564 __func__, __LINE__,
565 cmd->se_tfo->get_task_tag(cmd));
566
567 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
568
569 complete_all(&cmd->t_transport_stop_comp);
570 return 1;
571 }
572
573 cmd->transport_state &= ~CMD_T_ACTIVE;
574 if (remove_from_lists) {
575 /*
576 * Some fabric modules like tcm_loop can release
577 * their internally allocated I/O reference now and
578 * struct se_cmd now.
579 *
580 * Fabric modules are expected to return '1' here if the
581 * se_cmd being passed is released at this point,
582 * or zero if not being released.
583 */
584 if (cmd->se_tfo->check_stop_free != NULL) {
585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
586 return cmd->se_tfo->check_stop_free(cmd);
587 }
588 }
589
590 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
591 return 0;
592 }
593
594 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
595 {
596 return transport_cmd_check_stop(cmd, true, false);
597 }
598
599 static void transport_lun_remove_cmd(struct se_cmd *cmd)
600 {
601 struct se_lun *lun = cmd->se_lun;
602
603 if (!lun)
604 return;
605
606 if (cmpxchg(&cmd->lun_ref_active, true, false))
607 percpu_ref_put(&lun->lun_ref);
608 }
609
610 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
611 {
612 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
613 transport_lun_remove_cmd(cmd);
614 /*
615 * Allow the fabric driver to unmap any resources before
616 * releasing the descriptor via TFO->release_cmd()
617 */
618 if (remove)
619 cmd->se_tfo->aborted_task(cmd);
620
621 if (transport_cmd_check_stop_to_fabric(cmd))
622 return;
623 if (remove)
624 transport_put_cmd(cmd);
625 }
626
627 static void target_complete_failure_work(struct work_struct *work)
628 {
629 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
630
631 transport_generic_request_failure(cmd,
632 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
633 }
634
635 /*
636 * Used when asking transport to copy Sense Data from the underlying
637 * Linux/SCSI struct scsi_cmnd
638 */
639 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
640 {
641 struct se_device *dev = cmd->se_dev;
642
643 WARN_ON(!cmd->se_lun);
644
645 if (!dev)
646 return NULL;
647
648 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
649 return NULL;
650
651 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
652
653 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
654 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
655 return cmd->sense_buffer;
656 }
657
658 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
659 {
660 struct se_device *dev = cmd->se_dev;
661 int success = scsi_status == GOOD;
662 unsigned long flags;
663
664 cmd->scsi_status = scsi_status;
665
666
667 spin_lock_irqsave(&cmd->t_state_lock, flags);
668 cmd->transport_state &= ~CMD_T_BUSY;
669
670 if (dev && dev->transport->transport_complete) {
671 dev->transport->transport_complete(cmd,
672 cmd->t_data_sg,
673 transport_get_sense_buffer(cmd));
674 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
675 success = 1;
676 }
677
678 /*
679 * See if we are waiting to complete for an exception condition.
680 */
681 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
682 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
683 complete(&cmd->task_stop_comp);
684 return;
685 }
686
687 /*
688 * Check for case where an explicit ABORT_TASK has been received
689 * and transport_wait_for_tasks() will be waiting for completion..
690 */
691 if (cmd->transport_state & CMD_T_ABORTED &&
692 cmd->transport_state & CMD_T_STOP) {
693 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
694 complete_all(&cmd->t_transport_stop_comp);
695 return;
696 } else if (!success) {
697 INIT_WORK(&cmd->work, target_complete_failure_work);
698 } else {
699 INIT_WORK(&cmd->work, target_complete_ok_work);
700 }
701
702 cmd->t_state = TRANSPORT_COMPLETE;
703 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
704 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
705
706 queue_work(target_completion_wq, &cmd->work);
707 }
708 EXPORT_SYMBOL(target_complete_cmd);
709
710 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
711 {
712 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
713 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
714 cmd->residual_count += cmd->data_length - length;
715 } else {
716 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
717 cmd->residual_count = cmd->data_length - length;
718 }
719
720 cmd->data_length = length;
721 }
722
723 target_complete_cmd(cmd, scsi_status);
724 }
725 EXPORT_SYMBOL(target_complete_cmd_with_length);
726
727 static void target_add_to_state_list(struct se_cmd *cmd)
728 {
729 struct se_device *dev = cmd->se_dev;
730 unsigned long flags;
731
732 spin_lock_irqsave(&dev->execute_task_lock, flags);
733 if (!cmd->state_active) {
734 list_add_tail(&cmd->state_list, &dev->state_list);
735 cmd->state_active = true;
736 }
737 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
738 }
739
740 /*
741 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
742 */
743 static void transport_write_pending_qf(struct se_cmd *cmd);
744 static void transport_complete_qf(struct se_cmd *cmd);
745
746 void target_qf_do_work(struct work_struct *work)
747 {
748 struct se_device *dev = container_of(work, struct se_device,
749 qf_work_queue);
750 LIST_HEAD(qf_cmd_list);
751 struct se_cmd *cmd, *cmd_tmp;
752
753 spin_lock_irq(&dev->qf_cmd_lock);
754 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
755 spin_unlock_irq(&dev->qf_cmd_lock);
756
757 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
758 list_del(&cmd->se_qf_node);
759 atomic_dec_mb(&dev->dev_qf_count);
760
761 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
762 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
763 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
764 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
765 : "UNKNOWN");
766
767 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
768 transport_write_pending_qf(cmd);
769 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
770 transport_complete_qf(cmd);
771 }
772 }
773
774 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
775 {
776 switch (cmd->data_direction) {
777 case DMA_NONE:
778 return "NONE";
779 case DMA_FROM_DEVICE:
780 return "READ";
781 case DMA_TO_DEVICE:
782 return "WRITE";
783 case DMA_BIDIRECTIONAL:
784 return "BIDI";
785 default:
786 break;
787 }
788
789 return "UNKNOWN";
790 }
791
792 void transport_dump_dev_state(
793 struct se_device *dev,
794 char *b,
795 int *bl)
796 {
797 *bl += sprintf(b + *bl, "Status: ");
798 if (dev->export_count)
799 *bl += sprintf(b + *bl, "ACTIVATED");
800 else
801 *bl += sprintf(b + *bl, "DEACTIVATED");
802
803 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
804 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
805 dev->dev_attrib.block_size,
806 dev->dev_attrib.hw_max_sectors);
807 *bl += sprintf(b + *bl, " ");
808 }
809
810 void transport_dump_vpd_proto_id(
811 struct t10_vpd *vpd,
812 unsigned char *p_buf,
813 int p_buf_len)
814 {
815 unsigned char buf[VPD_TMP_BUF_SIZE];
816 int len;
817
818 memset(buf, 0, VPD_TMP_BUF_SIZE);
819 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
820
821 switch (vpd->protocol_identifier) {
822 case 0x00:
823 sprintf(buf+len, "Fibre Channel\n");
824 break;
825 case 0x10:
826 sprintf(buf+len, "Parallel SCSI\n");
827 break;
828 case 0x20:
829 sprintf(buf+len, "SSA\n");
830 break;
831 case 0x30:
832 sprintf(buf+len, "IEEE 1394\n");
833 break;
834 case 0x40:
835 sprintf(buf+len, "SCSI Remote Direct Memory Access"
836 " Protocol\n");
837 break;
838 case 0x50:
839 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
840 break;
841 case 0x60:
842 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
843 break;
844 case 0x70:
845 sprintf(buf+len, "Automation/Drive Interface Transport"
846 " Protocol\n");
847 break;
848 case 0x80:
849 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
850 break;
851 default:
852 sprintf(buf+len, "Unknown 0x%02x\n",
853 vpd->protocol_identifier);
854 break;
855 }
856
857 if (p_buf)
858 strncpy(p_buf, buf, p_buf_len);
859 else
860 pr_debug("%s", buf);
861 }
862
863 void
864 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
865 {
866 /*
867 * Check if the Protocol Identifier Valid (PIV) bit is set..
868 *
869 * from spc3r23.pdf section 7.5.1
870 */
871 if (page_83[1] & 0x80) {
872 vpd->protocol_identifier = (page_83[0] & 0xf0);
873 vpd->protocol_identifier_set = 1;
874 transport_dump_vpd_proto_id(vpd, NULL, 0);
875 }
876 }
877 EXPORT_SYMBOL(transport_set_vpd_proto_id);
878
879 int transport_dump_vpd_assoc(
880 struct t10_vpd *vpd,
881 unsigned char *p_buf,
882 int p_buf_len)
883 {
884 unsigned char buf[VPD_TMP_BUF_SIZE];
885 int ret = 0;
886 int len;
887
888 memset(buf, 0, VPD_TMP_BUF_SIZE);
889 len = sprintf(buf, "T10 VPD Identifier Association: ");
890
891 switch (vpd->association) {
892 case 0x00:
893 sprintf(buf+len, "addressed logical unit\n");
894 break;
895 case 0x10:
896 sprintf(buf+len, "target port\n");
897 break;
898 case 0x20:
899 sprintf(buf+len, "SCSI target device\n");
900 break;
901 default:
902 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
903 ret = -EINVAL;
904 break;
905 }
906
907 if (p_buf)
908 strncpy(p_buf, buf, p_buf_len);
909 else
910 pr_debug("%s", buf);
911
912 return ret;
913 }
914
915 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
916 {
917 /*
918 * The VPD identification association..
919 *
920 * from spc3r23.pdf Section 7.6.3.1 Table 297
921 */
922 vpd->association = (page_83[1] & 0x30);
923 return transport_dump_vpd_assoc(vpd, NULL, 0);
924 }
925 EXPORT_SYMBOL(transport_set_vpd_assoc);
926
927 int transport_dump_vpd_ident_type(
928 struct t10_vpd *vpd,
929 unsigned char *p_buf,
930 int p_buf_len)
931 {
932 unsigned char buf[VPD_TMP_BUF_SIZE];
933 int ret = 0;
934 int len;
935
936 memset(buf, 0, VPD_TMP_BUF_SIZE);
937 len = sprintf(buf, "T10 VPD Identifier Type: ");
938
939 switch (vpd->device_identifier_type) {
940 case 0x00:
941 sprintf(buf+len, "Vendor specific\n");
942 break;
943 case 0x01:
944 sprintf(buf+len, "T10 Vendor ID based\n");
945 break;
946 case 0x02:
947 sprintf(buf+len, "EUI-64 based\n");
948 break;
949 case 0x03:
950 sprintf(buf+len, "NAA\n");
951 break;
952 case 0x04:
953 sprintf(buf+len, "Relative target port identifier\n");
954 break;
955 case 0x08:
956 sprintf(buf+len, "SCSI name string\n");
957 break;
958 default:
959 sprintf(buf+len, "Unsupported: 0x%02x\n",
960 vpd->device_identifier_type);
961 ret = -EINVAL;
962 break;
963 }
964
965 if (p_buf) {
966 if (p_buf_len < strlen(buf)+1)
967 return -EINVAL;
968 strncpy(p_buf, buf, p_buf_len);
969 } else {
970 pr_debug("%s", buf);
971 }
972
973 return ret;
974 }
975
976 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
977 {
978 /*
979 * The VPD identifier type..
980 *
981 * from spc3r23.pdf Section 7.6.3.1 Table 298
982 */
983 vpd->device_identifier_type = (page_83[1] & 0x0f);
984 return transport_dump_vpd_ident_type(vpd, NULL, 0);
985 }
986 EXPORT_SYMBOL(transport_set_vpd_ident_type);
987
988 int transport_dump_vpd_ident(
989 struct t10_vpd *vpd,
990 unsigned char *p_buf,
991 int p_buf_len)
992 {
993 unsigned char buf[VPD_TMP_BUF_SIZE];
994 int ret = 0;
995
996 memset(buf, 0, VPD_TMP_BUF_SIZE);
997
998 switch (vpd->device_identifier_code_set) {
999 case 0x01: /* Binary */
1000 snprintf(buf, sizeof(buf),
1001 "T10 VPD Binary Device Identifier: %s\n",
1002 &vpd->device_identifier[0]);
1003 break;
1004 case 0x02: /* ASCII */
1005 snprintf(buf, sizeof(buf),
1006 "T10 VPD ASCII Device Identifier: %s\n",
1007 &vpd->device_identifier[0]);
1008 break;
1009 case 0x03: /* UTF-8 */
1010 snprintf(buf, sizeof(buf),
1011 "T10 VPD UTF-8 Device Identifier: %s\n",
1012 &vpd->device_identifier[0]);
1013 break;
1014 default:
1015 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1016 " 0x%02x", vpd->device_identifier_code_set);
1017 ret = -EINVAL;
1018 break;
1019 }
1020
1021 if (p_buf)
1022 strncpy(p_buf, buf, p_buf_len);
1023 else
1024 pr_debug("%s", buf);
1025
1026 return ret;
1027 }
1028
1029 int
1030 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1031 {
1032 static const char hex_str[] = "0123456789abcdef";
1033 int j = 0, i = 4; /* offset to start of the identifier */
1034
1035 /*
1036 * The VPD Code Set (encoding)
1037 *
1038 * from spc3r23.pdf Section 7.6.3.1 Table 296
1039 */
1040 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1041 switch (vpd->device_identifier_code_set) {
1042 case 0x01: /* Binary */
1043 vpd->device_identifier[j++] =
1044 hex_str[vpd->device_identifier_type];
1045 while (i < (4 + page_83[3])) {
1046 vpd->device_identifier[j++] =
1047 hex_str[(page_83[i] & 0xf0) >> 4];
1048 vpd->device_identifier[j++] =
1049 hex_str[page_83[i] & 0x0f];
1050 i++;
1051 }
1052 break;
1053 case 0x02: /* ASCII */
1054 case 0x03: /* UTF-8 */
1055 while (i < (4 + page_83[3]))
1056 vpd->device_identifier[j++] = page_83[i++];
1057 break;
1058 default:
1059 break;
1060 }
1061
1062 return transport_dump_vpd_ident(vpd, NULL, 0);
1063 }
1064 EXPORT_SYMBOL(transport_set_vpd_ident);
1065
1066 sense_reason_t
1067 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1068 {
1069 struct se_device *dev = cmd->se_dev;
1070
1071 if (cmd->unknown_data_length) {
1072 cmd->data_length = size;
1073 } else if (size != cmd->data_length) {
1074 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1075 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1076 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1077 cmd->data_length, size, cmd->t_task_cdb[0]);
1078
1079 if (cmd->data_direction == DMA_TO_DEVICE) {
1080 pr_err("Rejecting underflow/overflow"
1081 " WRITE data\n");
1082 return TCM_INVALID_CDB_FIELD;
1083 }
1084 /*
1085 * Reject READ_* or WRITE_* with overflow/underflow for
1086 * type SCF_SCSI_DATA_CDB.
1087 */
1088 if (dev->dev_attrib.block_size != 512) {
1089 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1090 " CDB on non 512-byte sector setup subsystem"
1091 " plugin: %s\n", dev->transport->name);
1092 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1093 return TCM_INVALID_CDB_FIELD;
1094 }
1095 /*
1096 * For the overflow case keep the existing fabric provided
1097 * ->data_length. Otherwise for the underflow case, reset
1098 * ->data_length to the smaller SCSI expected data transfer
1099 * length.
1100 */
1101 if (size > cmd->data_length) {
1102 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1103 cmd->residual_count = (size - cmd->data_length);
1104 } else {
1105 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1106 cmd->residual_count = (cmd->data_length - size);
1107 cmd->data_length = size;
1108 }
1109 }
1110
1111 return 0;
1112
1113 }
1114
1115 /*
1116 * Used by fabric modules containing a local struct se_cmd within their
1117 * fabric dependent per I/O descriptor.
1118 */
1119 void transport_init_se_cmd(
1120 struct se_cmd *cmd,
1121 struct target_core_fabric_ops *tfo,
1122 struct se_session *se_sess,
1123 u32 data_length,
1124 int data_direction,
1125 int task_attr,
1126 unsigned char *sense_buffer)
1127 {
1128 INIT_LIST_HEAD(&cmd->se_delayed_node);
1129 INIT_LIST_HEAD(&cmd->se_qf_node);
1130 INIT_LIST_HEAD(&cmd->se_cmd_list);
1131 INIT_LIST_HEAD(&cmd->state_list);
1132 init_completion(&cmd->t_transport_stop_comp);
1133 init_completion(&cmd->cmd_wait_comp);
1134 init_completion(&cmd->task_stop_comp);
1135 spin_lock_init(&cmd->t_state_lock);
1136 kref_init(&cmd->cmd_kref);
1137 cmd->transport_state = CMD_T_DEV_ACTIVE;
1138
1139 cmd->se_tfo = tfo;
1140 cmd->se_sess = se_sess;
1141 cmd->data_length = data_length;
1142 cmd->data_direction = data_direction;
1143 cmd->sam_task_attr = task_attr;
1144 cmd->sense_buffer = sense_buffer;
1145
1146 cmd->state_active = false;
1147 }
1148 EXPORT_SYMBOL(transport_init_se_cmd);
1149
1150 static sense_reason_t
1151 transport_check_alloc_task_attr(struct se_cmd *cmd)
1152 {
1153 struct se_device *dev = cmd->se_dev;
1154
1155 /*
1156 * Check if SAM Task Attribute emulation is enabled for this
1157 * struct se_device storage object
1158 */
1159 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1160 return 0;
1161
1162 if (cmd->sam_task_attr == TCM_ACA_TAG) {
1163 pr_debug("SAM Task Attribute ACA"
1164 " emulation is not supported\n");
1165 return TCM_INVALID_CDB_FIELD;
1166 }
1167 /*
1168 * Used to determine when ORDERED commands should go from
1169 * Dormant to Active status.
1170 */
1171 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1172 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1173 cmd->se_ordered_id, cmd->sam_task_attr,
1174 dev->transport->name);
1175 return 0;
1176 }
1177
1178 sense_reason_t
1179 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1180 {
1181 struct se_device *dev = cmd->se_dev;
1182 sense_reason_t ret;
1183
1184 /*
1185 * Ensure that the received CDB is less than the max (252 + 8) bytes
1186 * for VARIABLE_LENGTH_CMD
1187 */
1188 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1189 pr_err("Received SCSI CDB with command_size: %d that"
1190 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1191 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1192 return TCM_INVALID_CDB_FIELD;
1193 }
1194 /*
1195 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1196 * allocate the additional extended CDB buffer now.. Otherwise
1197 * setup the pointer from __t_task_cdb to t_task_cdb.
1198 */
1199 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1200 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1201 GFP_KERNEL);
1202 if (!cmd->t_task_cdb) {
1203 pr_err("Unable to allocate cmd->t_task_cdb"
1204 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1205 scsi_command_size(cdb),
1206 (unsigned long)sizeof(cmd->__t_task_cdb));
1207 return TCM_OUT_OF_RESOURCES;
1208 }
1209 } else
1210 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1211 /*
1212 * Copy the original CDB into cmd->
1213 */
1214 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1215
1216 trace_target_sequencer_start(cmd);
1217
1218 /*
1219 * Check for an existing UNIT ATTENTION condition
1220 */
1221 ret = target_scsi3_ua_check(cmd);
1222 if (ret)
1223 return ret;
1224
1225 ret = target_alua_state_check(cmd);
1226 if (ret)
1227 return ret;
1228
1229 ret = target_check_reservation(cmd);
1230 if (ret) {
1231 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1232 return ret;
1233 }
1234
1235 ret = dev->transport->parse_cdb(cmd);
1236 if (ret)
1237 return ret;
1238
1239 ret = transport_check_alloc_task_attr(cmd);
1240 if (ret)
1241 return ret;
1242
1243 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1244
1245 spin_lock(&cmd->se_lun->lun_sep_lock);
1246 if (cmd->se_lun->lun_sep)
1247 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1248 spin_unlock(&cmd->se_lun->lun_sep_lock);
1249 return 0;
1250 }
1251 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1252
1253 /*
1254 * Used by fabric module frontends to queue tasks directly.
1255 * Many only be used from process context only
1256 */
1257 int transport_handle_cdb_direct(
1258 struct se_cmd *cmd)
1259 {
1260 sense_reason_t ret;
1261
1262 if (!cmd->se_lun) {
1263 dump_stack();
1264 pr_err("cmd->se_lun is NULL\n");
1265 return -EINVAL;
1266 }
1267 if (in_interrupt()) {
1268 dump_stack();
1269 pr_err("transport_generic_handle_cdb cannot be called"
1270 " from interrupt context\n");
1271 return -EINVAL;
1272 }
1273 /*
1274 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1275 * outstanding descriptors are handled correctly during shutdown via
1276 * transport_wait_for_tasks()
1277 *
1278 * Also, we don't take cmd->t_state_lock here as we only expect
1279 * this to be called for initial descriptor submission.
1280 */
1281 cmd->t_state = TRANSPORT_NEW_CMD;
1282 cmd->transport_state |= CMD_T_ACTIVE;
1283
1284 /*
1285 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1286 * so follow TRANSPORT_NEW_CMD processing thread context usage
1287 * and call transport_generic_request_failure() if necessary..
1288 */
1289 ret = transport_generic_new_cmd(cmd);
1290 if (ret)
1291 transport_generic_request_failure(cmd, ret);
1292 return 0;
1293 }
1294 EXPORT_SYMBOL(transport_handle_cdb_direct);
1295
1296 sense_reason_t
1297 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1298 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1299 {
1300 if (!sgl || !sgl_count)
1301 return 0;
1302
1303 /*
1304 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1305 * scatterlists already have been set to follow what the fabric
1306 * passes for the original expected data transfer length.
1307 */
1308 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1309 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1310 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1311 return TCM_INVALID_CDB_FIELD;
1312 }
1313
1314 cmd->t_data_sg = sgl;
1315 cmd->t_data_nents = sgl_count;
1316
1317 if (sgl_bidi && sgl_bidi_count) {
1318 cmd->t_bidi_data_sg = sgl_bidi;
1319 cmd->t_bidi_data_nents = sgl_bidi_count;
1320 }
1321 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1322 return 0;
1323 }
1324
1325 /*
1326 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1327 * se_cmd + use pre-allocated SGL memory.
1328 *
1329 * @se_cmd: command descriptor to submit
1330 * @se_sess: associated se_sess for endpoint
1331 * @cdb: pointer to SCSI CDB
1332 * @sense: pointer to SCSI sense buffer
1333 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1334 * @data_length: fabric expected data transfer length
1335 * @task_addr: SAM task attribute
1336 * @data_dir: DMA data direction
1337 * @flags: flags for command submission from target_sc_flags_tables
1338 * @sgl: struct scatterlist memory for unidirectional mapping
1339 * @sgl_count: scatterlist count for unidirectional mapping
1340 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1341 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1342 * @sgl_prot: struct scatterlist memory protection information
1343 * @sgl_prot_count: scatterlist count for protection information
1344 *
1345 * Returns non zero to signal active I/O shutdown failure. All other
1346 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1347 * but still return zero here.
1348 *
1349 * This may only be called from process context, and also currently
1350 * assumes internal allocation of fabric payload buffer by target-core.
1351 */
1352 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1353 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1354 u32 data_length, int task_attr, int data_dir, int flags,
1355 struct scatterlist *sgl, u32 sgl_count,
1356 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1357 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1358 {
1359 struct se_portal_group *se_tpg;
1360 sense_reason_t rc;
1361 int ret;
1362
1363 se_tpg = se_sess->se_tpg;
1364 BUG_ON(!se_tpg);
1365 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1366 BUG_ON(in_interrupt());
1367 /*
1368 * Initialize se_cmd for target operation. From this point
1369 * exceptions are handled by sending exception status via
1370 * target_core_fabric_ops->queue_status() callback
1371 */
1372 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1373 data_length, data_dir, task_attr, sense);
1374 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1375 se_cmd->unknown_data_length = 1;
1376 /*
1377 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1378 * se_sess->sess_cmd_list. A second kref_get here is necessary
1379 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1380 * kref_put() to happen during fabric packet acknowledgement.
1381 */
1382 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1383 if (ret)
1384 return ret;
1385 /*
1386 * Signal bidirectional data payloads to target-core
1387 */
1388 if (flags & TARGET_SCF_BIDI_OP)
1389 se_cmd->se_cmd_flags |= SCF_BIDI;
1390 /*
1391 * Locate se_lun pointer and attach it to struct se_cmd
1392 */
1393 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1394 if (rc) {
1395 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1396 target_put_sess_cmd(se_sess, se_cmd);
1397 return 0;
1398 }
1399
1400 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1401 if (rc != 0) {
1402 transport_generic_request_failure(se_cmd, rc);
1403 return 0;
1404 }
1405
1406 /*
1407 * Save pointers for SGLs containing protection information,
1408 * if present.
1409 */
1410 if (sgl_prot_count) {
1411 se_cmd->t_prot_sg = sgl_prot;
1412 se_cmd->t_prot_nents = sgl_prot_count;
1413 }
1414
1415 /*
1416 * When a non zero sgl_count has been passed perform SGL passthrough
1417 * mapping for pre-allocated fabric memory instead of having target
1418 * core perform an internal SGL allocation..
1419 */
1420 if (sgl_count != 0) {
1421 BUG_ON(!sgl);
1422
1423 /*
1424 * A work-around for tcm_loop as some userspace code via
1425 * scsi-generic do not memset their associated read buffers,
1426 * so go ahead and do that here for type non-data CDBs. Also
1427 * note that this is currently guaranteed to be a single SGL
1428 * for this case by target core in target_setup_cmd_from_cdb()
1429 * -> transport_generic_cmd_sequencer().
1430 */
1431 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1432 se_cmd->data_direction == DMA_FROM_DEVICE) {
1433 unsigned char *buf = NULL;
1434
1435 if (sgl)
1436 buf = kmap(sg_page(sgl)) + sgl->offset;
1437
1438 if (buf) {
1439 memset(buf, 0, sgl->length);
1440 kunmap(sg_page(sgl));
1441 }
1442 }
1443
1444 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1445 sgl_bidi, sgl_bidi_count);
1446 if (rc != 0) {
1447 transport_generic_request_failure(se_cmd, rc);
1448 return 0;
1449 }
1450 }
1451
1452 /*
1453 * Check if we need to delay processing because of ALUA
1454 * Active/NonOptimized primary access state..
1455 */
1456 core_alua_check_nonop_delay(se_cmd);
1457
1458 transport_handle_cdb_direct(se_cmd);
1459 return 0;
1460 }
1461 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1462
1463 /*
1464 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1465 *
1466 * @se_cmd: command descriptor to submit
1467 * @se_sess: associated se_sess for endpoint
1468 * @cdb: pointer to SCSI CDB
1469 * @sense: pointer to SCSI sense buffer
1470 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1471 * @data_length: fabric expected data transfer length
1472 * @task_addr: SAM task attribute
1473 * @data_dir: DMA data direction
1474 * @flags: flags for command submission from target_sc_flags_tables
1475 *
1476 * Returns non zero to signal active I/O shutdown failure. All other
1477 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1478 * but still return zero here.
1479 *
1480 * This may only be called from process context, and also currently
1481 * assumes internal allocation of fabric payload buffer by target-core.
1482 *
1483 * It also assumes interal target core SGL memory allocation.
1484 */
1485 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1486 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1487 u32 data_length, int task_attr, int data_dir, int flags)
1488 {
1489 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1490 unpacked_lun, data_length, task_attr, data_dir,
1491 flags, NULL, 0, NULL, 0, NULL, 0);
1492 }
1493 EXPORT_SYMBOL(target_submit_cmd);
1494
1495 static void target_complete_tmr_failure(struct work_struct *work)
1496 {
1497 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1498
1499 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1500 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1501
1502 transport_cmd_check_stop_to_fabric(se_cmd);
1503 }
1504
1505 /**
1506 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1507 * for TMR CDBs
1508 *
1509 * @se_cmd: command descriptor to submit
1510 * @se_sess: associated se_sess for endpoint
1511 * @sense: pointer to SCSI sense buffer
1512 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1513 * @fabric_context: fabric context for TMR req
1514 * @tm_type: Type of TM request
1515 * @gfp: gfp type for caller
1516 * @tag: referenced task tag for TMR_ABORT_TASK
1517 * @flags: submit cmd flags
1518 *
1519 * Callable from all contexts.
1520 **/
1521
1522 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1523 unsigned char *sense, u32 unpacked_lun,
1524 void *fabric_tmr_ptr, unsigned char tm_type,
1525 gfp_t gfp, unsigned int tag, int flags)
1526 {
1527 struct se_portal_group *se_tpg;
1528 int ret;
1529
1530 se_tpg = se_sess->se_tpg;
1531 BUG_ON(!se_tpg);
1532
1533 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1534 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
1535 /*
1536 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1537 * allocation failure.
1538 */
1539 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1540 if (ret < 0)
1541 return -ENOMEM;
1542
1543 if (tm_type == TMR_ABORT_TASK)
1544 se_cmd->se_tmr_req->ref_task_tag = tag;
1545
1546 /* See target_submit_cmd for commentary */
1547 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1548 if (ret) {
1549 core_tmr_release_req(se_cmd->se_tmr_req);
1550 return ret;
1551 }
1552
1553 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1554 if (ret) {
1555 /*
1556 * For callback during failure handling, push this work off
1557 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1558 */
1559 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1560 schedule_work(&se_cmd->work);
1561 return 0;
1562 }
1563 transport_generic_handle_tmr(se_cmd);
1564 return 0;
1565 }
1566 EXPORT_SYMBOL(target_submit_tmr);
1567
1568 /*
1569 * If the cmd is active, request it to be stopped and sleep until it
1570 * has completed.
1571 */
1572 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1573 {
1574 bool was_active = false;
1575
1576 if (cmd->transport_state & CMD_T_BUSY) {
1577 cmd->transport_state |= CMD_T_REQUEST_STOP;
1578 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1579
1580 pr_debug("cmd %p waiting to complete\n", cmd);
1581 wait_for_completion(&cmd->task_stop_comp);
1582 pr_debug("cmd %p stopped successfully\n", cmd);
1583
1584 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1585 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1586 cmd->transport_state &= ~CMD_T_BUSY;
1587 was_active = true;
1588 }
1589
1590 return was_active;
1591 }
1592
1593 /*
1594 * Handle SAM-esque emulation for generic transport request failures.
1595 */
1596 void transport_generic_request_failure(struct se_cmd *cmd,
1597 sense_reason_t sense_reason)
1598 {
1599 int ret = 0;
1600
1601 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1602 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1603 cmd->t_task_cdb[0]);
1604 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1605 cmd->se_tfo->get_cmd_state(cmd),
1606 cmd->t_state, sense_reason);
1607 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1608 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1609 (cmd->transport_state & CMD_T_STOP) != 0,
1610 (cmd->transport_state & CMD_T_SENT) != 0);
1611
1612 /*
1613 * For SAM Task Attribute emulation for failed struct se_cmd
1614 */
1615 transport_complete_task_attr(cmd);
1616 /*
1617 * Handle special case for COMPARE_AND_WRITE failure, where the
1618 * callback is expected to drop the per device ->caw_mutex.
1619 */
1620 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1621 cmd->transport_complete_callback)
1622 cmd->transport_complete_callback(cmd);
1623
1624 switch (sense_reason) {
1625 case TCM_NON_EXISTENT_LUN:
1626 case TCM_UNSUPPORTED_SCSI_OPCODE:
1627 case TCM_INVALID_CDB_FIELD:
1628 case TCM_INVALID_PARAMETER_LIST:
1629 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1630 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1631 case TCM_UNKNOWN_MODE_PAGE:
1632 case TCM_WRITE_PROTECTED:
1633 case TCM_ADDRESS_OUT_OF_RANGE:
1634 case TCM_CHECK_CONDITION_ABORT_CMD:
1635 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1636 case TCM_CHECK_CONDITION_NOT_READY:
1637 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1638 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1639 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1640 break;
1641 case TCM_OUT_OF_RESOURCES:
1642 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1643 break;
1644 case TCM_RESERVATION_CONFLICT:
1645 /*
1646 * No SENSE Data payload for this case, set SCSI Status
1647 * and queue the response to $FABRIC_MOD.
1648 *
1649 * Uses linux/include/scsi/scsi.h SAM status codes defs
1650 */
1651 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1652 /*
1653 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1654 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1655 * CONFLICT STATUS.
1656 *
1657 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1658 */
1659 if (cmd->se_sess &&
1660 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1661 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1662 cmd->orig_fe_lun, 0x2C,
1663 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1664
1665 trace_target_cmd_complete(cmd);
1666 ret = cmd->se_tfo-> queue_status(cmd);
1667 if (ret == -EAGAIN || ret == -ENOMEM)
1668 goto queue_full;
1669 goto check_stop;
1670 default:
1671 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1672 cmd->t_task_cdb[0], sense_reason);
1673 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1674 break;
1675 }
1676
1677 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1678 if (ret == -EAGAIN || ret == -ENOMEM)
1679 goto queue_full;
1680
1681 check_stop:
1682 transport_lun_remove_cmd(cmd);
1683 if (!transport_cmd_check_stop_to_fabric(cmd))
1684 ;
1685 return;
1686
1687 queue_full:
1688 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1689 transport_handle_queue_full(cmd, cmd->se_dev);
1690 }
1691 EXPORT_SYMBOL(transport_generic_request_failure);
1692
1693 void __target_execute_cmd(struct se_cmd *cmd)
1694 {
1695 sense_reason_t ret;
1696
1697 if (cmd->execute_cmd) {
1698 ret = cmd->execute_cmd(cmd);
1699 if (ret) {
1700 spin_lock_irq(&cmd->t_state_lock);
1701 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1702 spin_unlock_irq(&cmd->t_state_lock);
1703
1704 transport_generic_request_failure(cmd, ret);
1705 }
1706 }
1707 }
1708
1709 static bool target_handle_task_attr(struct se_cmd *cmd)
1710 {
1711 struct se_device *dev = cmd->se_dev;
1712
1713 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1714 return false;
1715
1716 /*
1717 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1718 * to allow the passed struct se_cmd list of tasks to the front of the list.
1719 */
1720 switch (cmd->sam_task_attr) {
1721 case TCM_HEAD_TAG:
1722 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1723 "se_ordered_id: %u\n",
1724 cmd->t_task_cdb[0], cmd->se_ordered_id);
1725 return false;
1726 case TCM_ORDERED_TAG:
1727 atomic_inc_mb(&dev->dev_ordered_sync);
1728
1729 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1730 " se_ordered_id: %u\n",
1731 cmd->t_task_cdb[0], cmd->se_ordered_id);
1732
1733 /*
1734 * Execute an ORDERED command if no other older commands
1735 * exist that need to be completed first.
1736 */
1737 if (!atomic_read(&dev->simple_cmds))
1738 return false;
1739 break;
1740 default:
1741 /*
1742 * For SIMPLE and UNTAGGED Task Attribute commands
1743 */
1744 atomic_inc_mb(&dev->simple_cmds);
1745 break;
1746 }
1747
1748 if (atomic_read(&dev->dev_ordered_sync) == 0)
1749 return false;
1750
1751 spin_lock(&dev->delayed_cmd_lock);
1752 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1753 spin_unlock(&dev->delayed_cmd_lock);
1754
1755 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1756 " delayed CMD list, se_ordered_id: %u\n",
1757 cmd->t_task_cdb[0], cmd->sam_task_attr,
1758 cmd->se_ordered_id);
1759 return true;
1760 }
1761
1762 void target_execute_cmd(struct se_cmd *cmd)
1763 {
1764 /*
1765 * If the received CDB has aleady been aborted stop processing it here.
1766 */
1767 if (transport_check_aborted_status(cmd, 1))
1768 return;
1769
1770 /*
1771 * Determine if frontend context caller is requesting the stopping of
1772 * this command for frontend exceptions.
1773 */
1774 spin_lock_irq(&cmd->t_state_lock);
1775 if (cmd->transport_state & CMD_T_STOP) {
1776 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1777 __func__, __LINE__,
1778 cmd->se_tfo->get_task_tag(cmd));
1779
1780 spin_unlock_irq(&cmd->t_state_lock);
1781 complete_all(&cmd->t_transport_stop_comp);
1782 return;
1783 }
1784
1785 cmd->t_state = TRANSPORT_PROCESSING;
1786 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1787 spin_unlock_irq(&cmd->t_state_lock);
1788 /*
1789 * Perform WRITE_INSERT of PI using software emulation when backend
1790 * device has PI enabled, if the transport has not already generated
1791 * PI using hardware WRITE_INSERT offload.
1792 */
1793 if (cmd->prot_op == TARGET_PROT_DOUT_INSERT) {
1794 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1795 sbc_dif_generate(cmd);
1796 }
1797
1798 if (target_handle_task_attr(cmd)) {
1799 spin_lock_irq(&cmd->t_state_lock);
1800 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1801 spin_unlock_irq(&cmd->t_state_lock);
1802 return;
1803 }
1804
1805 __target_execute_cmd(cmd);
1806 }
1807 EXPORT_SYMBOL(target_execute_cmd);
1808
1809 /*
1810 * Process all commands up to the last received ORDERED task attribute which
1811 * requires another blocking boundary
1812 */
1813 static void target_restart_delayed_cmds(struct se_device *dev)
1814 {
1815 for (;;) {
1816 struct se_cmd *cmd;
1817
1818 spin_lock(&dev->delayed_cmd_lock);
1819 if (list_empty(&dev->delayed_cmd_list)) {
1820 spin_unlock(&dev->delayed_cmd_lock);
1821 break;
1822 }
1823
1824 cmd = list_entry(dev->delayed_cmd_list.next,
1825 struct se_cmd, se_delayed_node);
1826 list_del(&cmd->se_delayed_node);
1827 spin_unlock(&dev->delayed_cmd_lock);
1828
1829 __target_execute_cmd(cmd);
1830
1831 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
1832 break;
1833 }
1834 }
1835
1836 /*
1837 * Called from I/O completion to determine which dormant/delayed
1838 * and ordered cmds need to have their tasks added to the execution queue.
1839 */
1840 static void transport_complete_task_attr(struct se_cmd *cmd)
1841 {
1842 struct se_device *dev = cmd->se_dev;
1843
1844 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1845 return;
1846
1847 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
1848 atomic_dec_mb(&dev->simple_cmds);
1849 dev->dev_cur_ordered_id++;
1850 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1851 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1852 cmd->se_ordered_id);
1853 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
1854 dev->dev_cur_ordered_id++;
1855 pr_debug("Incremented dev_cur_ordered_id: %u for"
1856 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1857 cmd->se_ordered_id);
1858 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
1859 atomic_dec_mb(&dev->dev_ordered_sync);
1860
1861 dev->dev_cur_ordered_id++;
1862 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1863 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1864 }
1865
1866 target_restart_delayed_cmds(dev);
1867 }
1868
1869 static void transport_complete_qf(struct se_cmd *cmd)
1870 {
1871 int ret = 0;
1872
1873 transport_complete_task_attr(cmd);
1874
1875 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1876 trace_target_cmd_complete(cmd);
1877 ret = cmd->se_tfo->queue_status(cmd);
1878 goto out;
1879 }
1880
1881 switch (cmd->data_direction) {
1882 case DMA_FROM_DEVICE:
1883 trace_target_cmd_complete(cmd);
1884 ret = cmd->se_tfo->queue_data_in(cmd);
1885 break;
1886 case DMA_TO_DEVICE:
1887 if (cmd->se_cmd_flags & SCF_BIDI) {
1888 ret = cmd->se_tfo->queue_data_in(cmd);
1889 if (ret < 0)
1890 break;
1891 }
1892 /* Fall through for DMA_TO_DEVICE */
1893 case DMA_NONE:
1894 trace_target_cmd_complete(cmd);
1895 ret = cmd->se_tfo->queue_status(cmd);
1896 break;
1897 default:
1898 break;
1899 }
1900
1901 out:
1902 if (ret < 0) {
1903 transport_handle_queue_full(cmd, cmd->se_dev);
1904 return;
1905 }
1906 transport_lun_remove_cmd(cmd);
1907 transport_cmd_check_stop_to_fabric(cmd);
1908 }
1909
1910 static void transport_handle_queue_full(
1911 struct se_cmd *cmd,
1912 struct se_device *dev)
1913 {
1914 spin_lock_irq(&dev->qf_cmd_lock);
1915 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1916 atomic_inc_mb(&dev->dev_qf_count);
1917 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1918
1919 schedule_work(&cmd->se_dev->qf_work_queue);
1920 }
1921
1922 static bool target_check_read_strip(struct se_cmd *cmd)
1923 {
1924 sense_reason_t rc;
1925
1926 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
1927 rc = sbc_dif_read_strip(cmd);
1928 if (rc) {
1929 cmd->pi_err = rc;
1930 return true;
1931 }
1932 }
1933
1934 return false;
1935 }
1936
1937 static void target_complete_ok_work(struct work_struct *work)
1938 {
1939 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1940 int ret;
1941
1942 /*
1943 * Check if we need to move delayed/dormant tasks from cmds on the
1944 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1945 * Attribute.
1946 */
1947 transport_complete_task_attr(cmd);
1948
1949 /*
1950 * Check to schedule QUEUE_FULL work, or execute an existing
1951 * cmd->transport_qf_callback()
1952 */
1953 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1954 schedule_work(&cmd->se_dev->qf_work_queue);
1955
1956 /*
1957 * Check if we need to send a sense buffer from
1958 * the struct se_cmd in question.
1959 */
1960 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1961 WARN_ON(!cmd->scsi_status);
1962 ret = transport_send_check_condition_and_sense(
1963 cmd, 0, 1);
1964 if (ret == -EAGAIN || ret == -ENOMEM)
1965 goto queue_full;
1966
1967 transport_lun_remove_cmd(cmd);
1968 transport_cmd_check_stop_to_fabric(cmd);
1969 return;
1970 }
1971 /*
1972 * Check for a callback, used by amongst other things
1973 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
1974 */
1975 if (cmd->transport_complete_callback) {
1976 sense_reason_t rc;
1977
1978 rc = cmd->transport_complete_callback(cmd);
1979 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
1980 return;
1981 } else if (rc) {
1982 ret = transport_send_check_condition_and_sense(cmd,
1983 rc, 0);
1984 if (ret == -EAGAIN || ret == -ENOMEM)
1985 goto queue_full;
1986
1987 transport_lun_remove_cmd(cmd);
1988 transport_cmd_check_stop_to_fabric(cmd);
1989 return;
1990 }
1991 }
1992
1993 switch (cmd->data_direction) {
1994 case DMA_FROM_DEVICE:
1995 spin_lock(&cmd->se_lun->lun_sep_lock);
1996 if (cmd->se_lun->lun_sep) {
1997 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1998 cmd->data_length;
1999 }
2000 spin_unlock(&cmd->se_lun->lun_sep_lock);
2001 /*
2002 * Perform READ_STRIP of PI using software emulation when
2003 * backend had PI enabled, if the transport will not be
2004 * performing hardware READ_STRIP offload.
2005 */
2006 if (cmd->prot_op == TARGET_PROT_DIN_STRIP &&
2007 target_check_read_strip(cmd)) {
2008 ret = transport_send_check_condition_and_sense(cmd,
2009 cmd->pi_err, 0);
2010 if (ret == -EAGAIN || ret == -ENOMEM)
2011 goto queue_full;
2012
2013 transport_lun_remove_cmd(cmd);
2014 transport_cmd_check_stop_to_fabric(cmd);
2015 return;
2016 }
2017
2018 trace_target_cmd_complete(cmd);
2019 ret = cmd->se_tfo->queue_data_in(cmd);
2020 if (ret == -EAGAIN || ret == -ENOMEM)
2021 goto queue_full;
2022 break;
2023 case DMA_TO_DEVICE:
2024 spin_lock(&cmd->se_lun->lun_sep_lock);
2025 if (cmd->se_lun->lun_sep) {
2026 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2027 cmd->data_length;
2028 }
2029 spin_unlock(&cmd->se_lun->lun_sep_lock);
2030 /*
2031 * Check if we need to send READ payload for BIDI-COMMAND
2032 */
2033 if (cmd->se_cmd_flags & SCF_BIDI) {
2034 spin_lock(&cmd->se_lun->lun_sep_lock);
2035 if (cmd->se_lun->lun_sep) {
2036 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2037 cmd->data_length;
2038 }
2039 spin_unlock(&cmd->se_lun->lun_sep_lock);
2040 ret = cmd->se_tfo->queue_data_in(cmd);
2041 if (ret == -EAGAIN || ret == -ENOMEM)
2042 goto queue_full;
2043 break;
2044 }
2045 /* Fall through for DMA_TO_DEVICE */
2046 case DMA_NONE:
2047 trace_target_cmd_complete(cmd);
2048 ret = cmd->se_tfo->queue_status(cmd);
2049 if (ret == -EAGAIN || ret == -ENOMEM)
2050 goto queue_full;
2051 break;
2052 default:
2053 break;
2054 }
2055
2056 transport_lun_remove_cmd(cmd);
2057 transport_cmd_check_stop_to_fabric(cmd);
2058 return;
2059
2060 queue_full:
2061 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2062 " data_direction: %d\n", cmd, cmd->data_direction);
2063 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2064 transport_handle_queue_full(cmd, cmd->se_dev);
2065 }
2066
2067 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2068 {
2069 struct scatterlist *sg;
2070 int count;
2071
2072 for_each_sg(sgl, sg, nents, count)
2073 __free_page(sg_page(sg));
2074
2075 kfree(sgl);
2076 }
2077
2078 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2079 {
2080 /*
2081 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2082 * emulation, and free + reset pointers if necessary..
2083 */
2084 if (!cmd->t_data_sg_orig)
2085 return;
2086
2087 kfree(cmd->t_data_sg);
2088 cmd->t_data_sg = cmd->t_data_sg_orig;
2089 cmd->t_data_sg_orig = NULL;
2090 cmd->t_data_nents = cmd->t_data_nents_orig;
2091 cmd->t_data_nents_orig = 0;
2092 }
2093
2094 static inline void transport_free_pages(struct se_cmd *cmd)
2095 {
2096 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2097 transport_reset_sgl_orig(cmd);
2098 return;
2099 }
2100 transport_reset_sgl_orig(cmd);
2101
2102 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2103 cmd->t_data_sg = NULL;
2104 cmd->t_data_nents = 0;
2105
2106 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2107 cmd->t_bidi_data_sg = NULL;
2108 cmd->t_bidi_data_nents = 0;
2109
2110 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2111 cmd->t_prot_sg = NULL;
2112 cmd->t_prot_nents = 0;
2113 }
2114
2115 /**
2116 * transport_release_cmd - free a command
2117 * @cmd: command to free
2118 *
2119 * This routine unconditionally frees a command, and reference counting
2120 * or list removal must be done in the caller.
2121 */
2122 static int transport_release_cmd(struct se_cmd *cmd)
2123 {
2124 BUG_ON(!cmd->se_tfo);
2125
2126 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2127 core_tmr_release_req(cmd->se_tmr_req);
2128 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2129 kfree(cmd->t_task_cdb);
2130 /*
2131 * If this cmd has been setup with target_get_sess_cmd(), drop
2132 * the kref and call ->release_cmd() in kref callback.
2133 */
2134 return target_put_sess_cmd(cmd->se_sess, cmd);
2135 }
2136
2137 /**
2138 * transport_put_cmd - release a reference to a command
2139 * @cmd: command to release
2140 *
2141 * This routine releases our reference to the command and frees it if possible.
2142 */
2143 static int transport_put_cmd(struct se_cmd *cmd)
2144 {
2145 transport_free_pages(cmd);
2146 return transport_release_cmd(cmd);
2147 }
2148
2149 void *transport_kmap_data_sg(struct se_cmd *cmd)
2150 {
2151 struct scatterlist *sg = cmd->t_data_sg;
2152 struct page **pages;
2153 int i;
2154
2155 /*
2156 * We need to take into account a possible offset here for fabrics like
2157 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2158 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2159 */
2160 if (!cmd->t_data_nents)
2161 return NULL;
2162
2163 BUG_ON(!sg);
2164 if (cmd->t_data_nents == 1)
2165 return kmap(sg_page(sg)) + sg->offset;
2166
2167 /* >1 page. use vmap */
2168 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2169 if (!pages)
2170 return NULL;
2171
2172 /* convert sg[] to pages[] */
2173 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2174 pages[i] = sg_page(sg);
2175 }
2176
2177 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2178 kfree(pages);
2179 if (!cmd->t_data_vmap)
2180 return NULL;
2181
2182 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2183 }
2184 EXPORT_SYMBOL(transport_kmap_data_sg);
2185
2186 void transport_kunmap_data_sg(struct se_cmd *cmd)
2187 {
2188 if (!cmd->t_data_nents) {
2189 return;
2190 } else if (cmd->t_data_nents == 1) {
2191 kunmap(sg_page(cmd->t_data_sg));
2192 return;
2193 }
2194
2195 vunmap(cmd->t_data_vmap);
2196 cmd->t_data_vmap = NULL;
2197 }
2198 EXPORT_SYMBOL(transport_kunmap_data_sg);
2199
2200 int
2201 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2202 bool zero_page)
2203 {
2204 struct scatterlist *sg;
2205 struct page *page;
2206 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2207 unsigned int nent;
2208 int i = 0;
2209
2210 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2211 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2212 if (!sg)
2213 return -ENOMEM;
2214
2215 sg_init_table(sg, nent);
2216
2217 while (length) {
2218 u32 page_len = min_t(u32, length, PAGE_SIZE);
2219 page = alloc_page(GFP_KERNEL | zero_flag);
2220 if (!page)
2221 goto out;
2222
2223 sg_set_page(&sg[i], page, page_len, 0);
2224 length -= page_len;
2225 i++;
2226 }
2227 *sgl = sg;
2228 *nents = nent;
2229 return 0;
2230
2231 out:
2232 while (i > 0) {
2233 i--;
2234 __free_page(sg_page(&sg[i]));
2235 }
2236 kfree(sg);
2237 return -ENOMEM;
2238 }
2239
2240 /*
2241 * Allocate any required resources to execute the command. For writes we
2242 * might not have the payload yet, so notify the fabric via a call to
2243 * ->write_pending instead. Otherwise place it on the execution queue.
2244 */
2245 sense_reason_t
2246 transport_generic_new_cmd(struct se_cmd *cmd)
2247 {
2248 int ret = 0;
2249
2250 /*
2251 * Determine is the TCM fabric module has already allocated physical
2252 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2253 * beforehand.
2254 */
2255 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2256 cmd->data_length) {
2257 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2258
2259 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2260 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2261 u32 bidi_length;
2262
2263 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2264 bidi_length = cmd->t_task_nolb *
2265 cmd->se_dev->dev_attrib.block_size;
2266 else
2267 bidi_length = cmd->data_length;
2268
2269 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2270 &cmd->t_bidi_data_nents,
2271 bidi_length, zero_flag);
2272 if (ret < 0)
2273 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2274 }
2275
2276 if (cmd->prot_op != TARGET_PROT_NORMAL) {
2277 ret = target_alloc_sgl(&cmd->t_prot_sg,
2278 &cmd->t_prot_nents,
2279 cmd->prot_length, true);
2280 if (ret < 0)
2281 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2282 }
2283
2284 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2285 cmd->data_length, zero_flag);
2286 if (ret < 0)
2287 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2288 }
2289 /*
2290 * If this command is not a write we can execute it right here,
2291 * for write buffers we need to notify the fabric driver first
2292 * and let it call back once the write buffers are ready.
2293 */
2294 target_add_to_state_list(cmd);
2295 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
2296 target_execute_cmd(cmd);
2297 return 0;
2298 }
2299 transport_cmd_check_stop(cmd, false, true);
2300
2301 ret = cmd->se_tfo->write_pending(cmd);
2302 if (ret == -EAGAIN || ret == -ENOMEM)
2303 goto queue_full;
2304
2305 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2306 WARN_ON(ret);
2307
2308 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2309
2310 queue_full:
2311 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2312 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2313 transport_handle_queue_full(cmd, cmd->se_dev);
2314 return 0;
2315 }
2316 EXPORT_SYMBOL(transport_generic_new_cmd);
2317
2318 static void transport_write_pending_qf(struct se_cmd *cmd)
2319 {
2320 int ret;
2321
2322 ret = cmd->se_tfo->write_pending(cmd);
2323 if (ret == -EAGAIN || ret == -ENOMEM) {
2324 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2325 cmd);
2326 transport_handle_queue_full(cmd, cmd->se_dev);
2327 }
2328 }
2329
2330 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2331 {
2332 unsigned long flags;
2333 int ret = 0;
2334
2335 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2336 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2337 transport_wait_for_tasks(cmd);
2338
2339 ret = transport_release_cmd(cmd);
2340 } else {
2341 if (wait_for_tasks)
2342 transport_wait_for_tasks(cmd);
2343 /*
2344 * Handle WRITE failure case where transport_generic_new_cmd()
2345 * has already added se_cmd to state_list, but fabric has
2346 * failed command before I/O submission.
2347 */
2348 if (cmd->state_active) {
2349 spin_lock_irqsave(&cmd->t_state_lock, flags);
2350 target_remove_from_state_list(cmd);
2351 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2352 }
2353
2354 if (cmd->se_lun)
2355 transport_lun_remove_cmd(cmd);
2356
2357 ret = transport_put_cmd(cmd);
2358 }
2359 return ret;
2360 }
2361 EXPORT_SYMBOL(transport_generic_free_cmd);
2362
2363 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2364 * @se_sess: session to reference
2365 * @se_cmd: command descriptor to add
2366 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2367 */
2368 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2369 bool ack_kref)
2370 {
2371 unsigned long flags;
2372 int ret = 0;
2373
2374 /*
2375 * Add a second kref if the fabric caller is expecting to handle
2376 * fabric acknowledgement that requires two target_put_sess_cmd()
2377 * invocations before se_cmd descriptor release.
2378 */
2379 if (ack_kref) {
2380 kref_get(&se_cmd->cmd_kref);
2381 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2382 }
2383
2384 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2385 if (se_sess->sess_tearing_down) {
2386 ret = -ESHUTDOWN;
2387 goto out;
2388 }
2389 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2390 out:
2391 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2392 return ret;
2393 }
2394 EXPORT_SYMBOL(target_get_sess_cmd);
2395
2396 static void target_release_cmd_kref(struct kref *kref)
2397 {
2398 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2399 struct se_session *se_sess = se_cmd->se_sess;
2400
2401 if (list_empty(&se_cmd->se_cmd_list)) {
2402 spin_unlock(&se_sess->sess_cmd_lock);
2403 se_cmd->se_tfo->release_cmd(se_cmd);
2404 return;
2405 }
2406 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2407 spin_unlock(&se_sess->sess_cmd_lock);
2408 complete(&se_cmd->cmd_wait_comp);
2409 return;
2410 }
2411 list_del(&se_cmd->se_cmd_list);
2412 spin_unlock(&se_sess->sess_cmd_lock);
2413
2414 se_cmd->se_tfo->release_cmd(se_cmd);
2415 }
2416
2417 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2418 * @se_sess: session to reference
2419 * @se_cmd: command descriptor to drop
2420 */
2421 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2422 {
2423 if (!se_sess) {
2424 se_cmd->se_tfo->release_cmd(se_cmd);
2425 return 1;
2426 }
2427 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2428 &se_sess->sess_cmd_lock);
2429 }
2430 EXPORT_SYMBOL(target_put_sess_cmd);
2431
2432 /* target_sess_cmd_list_set_waiting - Flag all commands in
2433 * sess_cmd_list to complete cmd_wait_comp. Set
2434 * sess_tearing_down so no more commands are queued.
2435 * @se_sess: session to flag
2436 */
2437 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2438 {
2439 struct se_cmd *se_cmd;
2440 unsigned long flags;
2441
2442 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2443 if (se_sess->sess_tearing_down) {
2444 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2445 return;
2446 }
2447 se_sess->sess_tearing_down = 1;
2448 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2449
2450 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2451 se_cmd->cmd_wait_set = 1;
2452
2453 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2454 }
2455 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2456
2457 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2458 * @se_sess: session to wait for active I/O
2459 */
2460 void target_wait_for_sess_cmds(struct se_session *se_sess)
2461 {
2462 struct se_cmd *se_cmd, *tmp_cmd;
2463 unsigned long flags;
2464
2465 list_for_each_entry_safe(se_cmd, tmp_cmd,
2466 &se_sess->sess_wait_list, se_cmd_list) {
2467 list_del(&se_cmd->se_cmd_list);
2468
2469 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2470 " %d\n", se_cmd, se_cmd->t_state,
2471 se_cmd->se_tfo->get_cmd_state(se_cmd));
2472
2473 wait_for_completion(&se_cmd->cmd_wait_comp);
2474 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2475 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2476 se_cmd->se_tfo->get_cmd_state(se_cmd));
2477
2478 se_cmd->se_tfo->release_cmd(se_cmd);
2479 }
2480
2481 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2482 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2483 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2484
2485 }
2486 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2487
2488 static int transport_clear_lun_ref_thread(void *p)
2489 {
2490 struct se_lun *lun = p;
2491
2492 percpu_ref_kill(&lun->lun_ref);
2493
2494 wait_for_completion(&lun->lun_ref_comp);
2495 complete(&lun->lun_shutdown_comp);
2496
2497 return 0;
2498 }
2499
2500 int transport_clear_lun_ref(struct se_lun *lun)
2501 {
2502 struct task_struct *kt;
2503
2504 kt = kthread_run(transport_clear_lun_ref_thread, lun,
2505 "tcm_cl_%u", lun->unpacked_lun);
2506 if (IS_ERR(kt)) {
2507 pr_err("Unable to start clear_lun thread\n");
2508 return PTR_ERR(kt);
2509 }
2510 wait_for_completion(&lun->lun_shutdown_comp);
2511
2512 return 0;
2513 }
2514
2515 /**
2516 * transport_wait_for_tasks - wait for completion to occur
2517 * @cmd: command to wait
2518 *
2519 * Called from frontend fabric context to wait for storage engine
2520 * to pause and/or release frontend generated struct se_cmd.
2521 */
2522 bool transport_wait_for_tasks(struct se_cmd *cmd)
2523 {
2524 unsigned long flags;
2525
2526 spin_lock_irqsave(&cmd->t_state_lock, flags);
2527 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2528 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2529 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2530 return false;
2531 }
2532
2533 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2534 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2535 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2536 return false;
2537 }
2538
2539 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2540 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2541 return false;
2542 }
2543
2544 cmd->transport_state |= CMD_T_STOP;
2545
2546 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2547 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2548 cmd, cmd->se_tfo->get_task_tag(cmd),
2549 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2550
2551 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2552
2553 wait_for_completion(&cmd->t_transport_stop_comp);
2554
2555 spin_lock_irqsave(&cmd->t_state_lock, flags);
2556 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2557
2558 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2559 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2560 cmd->se_tfo->get_task_tag(cmd));
2561
2562 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2563
2564 return true;
2565 }
2566 EXPORT_SYMBOL(transport_wait_for_tasks);
2567
2568 static int transport_get_sense_codes(
2569 struct se_cmd *cmd,
2570 u8 *asc,
2571 u8 *ascq)
2572 {
2573 *asc = cmd->scsi_asc;
2574 *ascq = cmd->scsi_ascq;
2575
2576 return 0;
2577 }
2578
2579 static
2580 void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2581 {
2582 /* Place failed LBA in sense data information descriptor 0. */
2583 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2584 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2585 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2586 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2587
2588 /* Descriptor Information: failing sector */
2589 put_unaligned_be64(bad_sector, &buffer[12]);
2590 }
2591
2592 int
2593 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2594 sense_reason_t reason, int from_transport)
2595 {
2596 unsigned char *buffer = cmd->sense_buffer;
2597 unsigned long flags;
2598 u8 asc = 0, ascq = 0;
2599
2600 spin_lock_irqsave(&cmd->t_state_lock, flags);
2601 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2602 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2603 return 0;
2604 }
2605 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2606 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2607
2608 if (!reason && from_transport)
2609 goto after_reason;
2610
2611 if (!from_transport)
2612 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2613
2614 /*
2615 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2616 * SENSE KEY values from include/scsi/scsi.h
2617 */
2618 switch (reason) {
2619 case TCM_NO_SENSE:
2620 /* CURRENT ERROR */
2621 buffer[0] = 0x70;
2622 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2623 /* Not Ready */
2624 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2625 /* NO ADDITIONAL SENSE INFORMATION */
2626 buffer[SPC_ASC_KEY_OFFSET] = 0;
2627 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2628 break;
2629 case TCM_NON_EXISTENT_LUN:
2630 /* CURRENT ERROR */
2631 buffer[0] = 0x70;
2632 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2633 /* ILLEGAL REQUEST */
2634 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2635 /* LOGICAL UNIT NOT SUPPORTED */
2636 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2637 break;
2638 case TCM_UNSUPPORTED_SCSI_OPCODE:
2639 case TCM_SECTOR_COUNT_TOO_MANY:
2640 /* CURRENT ERROR */
2641 buffer[0] = 0x70;
2642 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2643 /* ILLEGAL REQUEST */
2644 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2645 /* INVALID COMMAND OPERATION CODE */
2646 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2647 break;
2648 case TCM_UNKNOWN_MODE_PAGE:
2649 /* CURRENT ERROR */
2650 buffer[0] = 0x70;
2651 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2652 /* ILLEGAL REQUEST */
2653 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2654 /* INVALID FIELD IN CDB */
2655 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2656 break;
2657 case TCM_CHECK_CONDITION_ABORT_CMD:
2658 /* CURRENT ERROR */
2659 buffer[0] = 0x70;
2660 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2661 /* ABORTED COMMAND */
2662 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2663 /* BUS DEVICE RESET FUNCTION OCCURRED */
2664 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2665 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2666 break;
2667 case TCM_INCORRECT_AMOUNT_OF_DATA:
2668 /* CURRENT ERROR */
2669 buffer[0] = 0x70;
2670 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2671 /* ABORTED COMMAND */
2672 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2673 /* WRITE ERROR */
2674 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2675 /* NOT ENOUGH UNSOLICITED DATA */
2676 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2677 break;
2678 case TCM_INVALID_CDB_FIELD:
2679 /* CURRENT ERROR */
2680 buffer[0] = 0x70;
2681 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2682 /* ILLEGAL REQUEST */
2683 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2684 /* INVALID FIELD IN CDB */
2685 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2686 break;
2687 case TCM_INVALID_PARAMETER_LIST:
2688 /* CURRENT ERROR */
2689 buffer[0] = 0x70;
2690 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2691 /* ILLEGAL REQUEST */
2692 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2693 /* INVALID FIELD IN PARAMETER LIST */
2694 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2695 break;
2696 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2697 /* CURRENT ERROR */
2698 buffer[0] = 0x70;
2699 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2700 /* ILLEGAL REQUEST */
2701 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2702 /* PARAMETER LIST LENGTH ERROR */
2703 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2704 break;
2705 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2706 /* CURRENT ERROR */
2707 buffer[0] = 0x70;
2708 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2709 /* ABORTED COMMAND */
2710 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2711 /* WRITE ERROR */
2712 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2713 /* UNEXPECTED_UNSOLICITED_DATA */
2714 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2715 break;
2716 case TCM_SERVICE_CRC_ERROR:
2717 /* CURRENT ERROR */
2718 buffer[0] = 0x70;
2719 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2720 /* ABORTED COMMAND */
2721 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2722 /* PROTOCOL SERVICE CRC ERROR */
2723 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2724 /* N/A */
2725 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2726 break;
2727 case TCM_SNACK_REJECTED:
2728 /* CURRENT ERROR */
2729 buffer[0] = 0x70;
2730 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2731 /* ABORTED COMMAND */
2732 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2733 /* READ ERROR */
2734 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2735 /* FAILED RETRANSMISSION REQUEST */
2736 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2737 break;
2738 case TCM_WRITE_PROTECTED:
2739 /* CURRENT ERROR */
2740 buffer[0] = 0x70;
2741 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2742 /* DATA PROTECT */
2743 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2744 /* WRITE PROTECTED */
2745 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2746 break;
2747 case TCM_ADDRESS_OUT_OF_RANGE:
2748 /* CURRENT ERROR */
2749 buffer[0] = 0x70;
2750 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2751 /* ILLEGAL REQUEST */
2752 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2753 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2754 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2755 break;
2756 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2757 /* CURRENT ERROR */
2758 buffer[0] = 0x70;
2759 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2760 /* UNIT ATTENTION */
2761 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2762 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2763 buffer[SPC_ASC_KEY_OFFSET] = asc;
2764 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2765 break;
2766 case TCM_CHECK_CONDITION_NOT_READY:
2767 /* CURRENT ERROR */
2768 buffer[0] = 0x70;
2769 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2770 /* Not Ready */
2771 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2772 transport_get_sense_codes(cmd, &asc, &ascq);
2773 buffer[SPC_ASC_KEY_OFFSET] = asc;
2774 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2775 break;
2776 case TCM_MISCOMPARE_VERIFY:
2777 /* CURRENT ERROR */
2778 buffer[0] = 0x70;
2779 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2780 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2781 /* MISCOMPARE DURING VERIFY OPERATION */
2782 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2783 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2784 break;
2785 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2786 /* CURRENT ERROR */
2787 buffer[0] = 0x70;
2788 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2789 /* ILLEGAL REQUEST */
2790 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2791 /* LOGICAL BLOCK GUARD CHECK FAILED */
2792 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2793 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
2794 transport_err_sector_info(buffer, cmd->bad_sector);
2795 break;
2796 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2797 /* CURRENT ERROR */
2798 buffer[0] = 0x70;
2799 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2800 /* ILLEGAL REQUEST */
2801 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2802 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2803 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2804 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
2805 transport_err_sector_info(buffer, cmd->bad_sector);
2806 break;
2807 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2808 /* CURRENT ERROR */
2809 buffer[0] = 0x70;
2810 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2811 /* ILLEGAL REQUEST */
2812 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2813 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2814 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2815 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2816 transport_err_sector_info(buffer, cmd->bad_sector);
2817 break;
2818 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2819 default:
2820 /* CURRENT ERROR */
2821 buffer[0] = 0x70;
2822 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2823 /*
2824 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2825 * Solaris initiators. Returning NOT READY instead means the
2826 * operations will be retried a finite number of times and we
2827 * can survive intermittent errors.
2828 */
2829 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2830 /* LOGICAL UNIT COMMUNICATION FAILURE */
2831 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2832 break;
2833 }
2834 /*
2835 * This code uses linux/include/scsi/scsi.h SAM status codes!
2836 */
2837 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2838 /*
2839 * Automatically padded, this value is encoded in the fabric's
2840 * data_length response PDU containing the SCSI defined sense data.
2841 */
2842 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2843
2844 after_reason:
2845 trace_target_cmd_complete(cmd);
2846 return cmd->se_tfo->queue_status(cmd);
2847 }
2848 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2849
2850 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2851 {
2852 if (!(cmd->transport_state & CMD_T_ABORTED))
2853 return 0;
2854
2855 /*
2856 * If cmd has been aborted but either no status is to be sent or it has
2857 * already been sent, just return
2858 */
2859 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
2860 return 1;
2861
2862 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2863 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2864
2865 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
2866 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2867 trace_target_cmd_complete(cmd);
2868 cmd->se_tfo->queue_status(cmd);
2869
2870 return 1;
2871 }
2872 EXPORT_SYMBOL(transport_check_aborted_status);
2873
2874 void transport_send_task_abort(struct se_cmd *cmd)
2875 {
2876 unsigned long flags;
2877
2878 spin_lock_irqsave(&cmd->t_state_lock, flags);
2879 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
2880 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2881 return;
2882 }
2883 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2884
2885 /*
2886 * If there are still expected incoming fabric WRITEs, we wait
2887 * until until they have completed before sending a TASK_ABORTED
2888 * response. This response with TASK_ABORTED status will be
2889 * queued back to fabric module by transport_check_aborted_status().
2890 */
2891 if (cmd->data_direction == DMA_TO_DEVICE) {
2892 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2893 cmd->transport_state |= CMD_T_ABORTED;
2894 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
2895 return;
2896 }
2897 }
2898 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2899
2900 transport_lun_remove_cmd(cmd);
2901
2902 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2903 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2904 cmd->se_tfo->get_task_tag(cmd));
2905
2906 trace_target_cmd_complete(cmd);
2907 cmd->se_tfo->queue_status(cmd);
2908 }
2909
2910 static void target_tmr_work(struct work_struct *work)
2911 {
2912 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2913 struct se_device *dev = cmd->se_dev;
2914 struct se_tmr_req *tmr = cmd->se_tmr_req;
2915 int ret;
2916
2917 switch (tmr->function) {
2918 case TMR_ABORT_TASK:
2919 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2920 break;
2921 case TMR_ABORT_TASK_SET:
2922 case TMR_CLEAR_ACA:
2923 case TMR_CLEAR_TASK_SET:
2924 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2925 break;
2926 case TMR_LUN_RESET:
2927 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2928 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2929 TMR_FUNCTION_REJECTED;
2930 break;
2931 case TMR_TARGET_WARM_RESET:
2932 tmr->response = TMR_FUNCTION_REJECTED;
2933 break;
2934 case TMR_TARGET_COLD_RESET:
2935 tmr->response = TMR_FUNCTION_REJECTED;
2936 break;
2937 default:
2938 pr_err("Uknown TMR function: 0x%02x.\n",
2939 tmr->function);
2940 tmr->response = TMR_FUNCTION_REJECTED;
2941 break;
2942 }
2943
2944 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
2945 cmd->se_tfo->queue_tm_rsp(cmd);
2946
2947 transport_cmd_check_stop_to_fabric(cmd);
2948 }
2949
2950 int transport_generic_handle_tmr(
2951 struct se_cmd *cmd)
2952 {
2953 unsigned long flags;
2954
2955 spin_lock_irqsave(&cmd->t_state_lock, flags);
2956 cmd->transport_state |= CMD_T_ACTIVE;
2957 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2958
2959 INIT_WORK(&cmd->work, target_tmr_work);
2960 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
2961 return 0;
2962 }
2963 EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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