?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
USB: serial: fix whitespace issues
[zen-stable.git] / drivers / target / target_core_transport.c
blob3400ae6e93f83d2ae5b25395b97bbd6158877ec0
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/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
37 #include <linux/in.h>
38 #include <linux/cdrom.h>
39 #include <linux/module.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>
45 #include <scsi/scsi_tcq.h>
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_cdb.h"
57 #include "target_core_hba.h"
58 #include "target_core_pr.h"
59 #include "target_core_ua.h"
60
61 static int sub_api_initialized;
62
63 static struct workqueue_struct *target_completion_wq;
64 static struct kmem_cache *se_cmd_cache;
65 static struct kmem_cache *se_sess_cache;
66 struct kmem_cache *se_tmr_req_cache;
67 struct kmem_cache *se_ua_cache;
68 struct kmem_cache *t10_pr_reg_cache;
69 struct kmem_cache *t10_alua_lu_gp_cache;
70 struct kmem_cache *t10_alua_lu_gp_mem_cache;
71 struct kmem_cache *t10_alua_tg_pt_gp_cache;
72 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
73
74 static int transport_generic_write_pending(struct se_cmd *);
75 static int transport_processing_thread(void *param);
76 static int __transport_execute_tasks(struct se_device *dev);
77 static void transport_complete_task_attr(struct se_cmd *cmd);
78 static void transport_handle_queue_full(struct se_cmd *cmd,
79 struct se_device *dev);
80 static void transport_free_dev_tasks(struct se_cmd *cmd);
81 static int transport_generic_get_mem(struct se_cmd *cmd);
82 static void transport_put_cmd(struct se_cmd *cmd);
83 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
84 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
85 static void transport_generic_request_failure(struct se_cmd *, int, int);
86 static void target_complete_ok_work(struct work_struct *work);
87
88 int init_se_kmem_caches(void)
89 {
90 se_cmd_cache = kmem_cache_create("se_cmd_cache",
91 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
92 if (!se_cmd_cache) {
93 pr_err("kmem_cache_create for struct se_cmd failed\n");
94 goto out;
95 }
96 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
97 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
98 0, NULL);
99 if (!se_tmr_req_cache) {
100 pr_err("kmem_cache_create() for struct se_tmr_req"
101 " failed\n");
102 goto out_free_cmd_cache;
103 }
104 se_sess_cache = kmem_cache_create("se_sess_cache",
105 sizeof(struct se_session), __alignof__(struct se_session),
106 0, NULL);
107 if (!se_sess_cache) {
108 pr_err("kmem_cache_create() for struct se_session"
109 " failed\n");
110 goto out_free_tmr_req_cache;
111 }
112 se_ua_cache = kmem_cache_create("se_ua_cache",
113 sizeof(struct se_ua), __alignof__(struct se_ua),
114 0, NULL);
115 if (!se_ua_cache) {
116 pr_err("kmem_cache_create() for struct se_ua failed\n");
117 goto out_free_sess_cache;
118 }
119 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
120 sizeof(struct t10_pr_registration),
121 __alignof__(struct t10_pr_registration), 0, NULL);
122 if (!t10_pr_reg_cache) {
123 pr_err("kmem_cache_create() for struct t10_pr_registration"
124 " failed\n");
125 goto out_free_ua_cache;
126 }
127 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
128 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
129 0, NULL);
130 if (!t10_alua_lu_gp_cache) {
131 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
132 " failed\n");
133 goto out_free_pr_reg_cache;
134 }
135 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
136 sizeof(struct t10_alua_lu_gp_member),
137 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
138 if (!t10_alua_lu_gp_mem_cache) {
139 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
140 "cache failed\n");
141 goto out_free_lu_gp_cache;
142 }
143 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
144 sizeof(struct t10_alua_tg_pt_gp),
145 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
146 if (!t10_alua_tg_pt_gp_cache) {
147 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
148 "cache failed\n");
149 goto out_free_lu_gp_mem_cache;
150 }
151 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
152 "t10_alua_tg_pt_gp_mem_cache",
153 sizeof(struct t10_alua_tg_pt_gp_member),
154 __alignof__(struct t10_alua_tg_pt_gp_member),
155 0, NULL);
156 if (!t10_alua_tg_pt_gp_mem_cache) {
157 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
158 "mem_t failed\n");
159 goto out_free_tg_pt_gp_cache;
160 }
161
162 target_completion_wq = alloc_workqueue("target_completion",
163 WQ_MEM_RECLAIM, 0);
164 if (!target_completion_wq)
165 goto out_free_tg_pt_gp_mem_cache;
166
167 return 0;
168
169 out_free_tg_pt_gp_mem_cache:
170 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
171 out_free_tg_pt_gp_cache:
172 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
173 out_free_lu_gp_mem_cache:
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 out_free_lu_gp_cache:
176 kmem_cache_destroy(t10_alua_lu_gp_cache);
177 out_free_pr_reg_cache:
178 kmem_cache_destroy(t10_pr_reg_cache);
179 out_free_ua_cache:
180 kmem_cache_destroy(se_ua_cache);
181 out_free_sess_cache:
182 kmem_cache_destroy(se_sess_cache);
183 out_free_tmr_req_cache:
184 kmem_cache_destroy(se_tmr_req_cache);
185 out_free_cmd_cache:
186 kmem_cache_destroy(se_cmd_cache);
187 out:
188 return -ENOMEM;
189 }
190
191 void release_se_kmem_caches(void)
192 {
193 destroy_workqueue(target_completion_wq);
194 kmem_cache_destroy(se_cmd_cache);
195 kmem_cache_destroy(se_tmr_req_cache);
196 kmem_cache_destroy(se_sess_cache);
197 kmem_cache_destroy(se_ua_cache);
198 kmem_cache_destroy(t10_pr_reg_cache);
199 kmem_cache_destroy(t10_alua_lu_gp_cache);
200 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
201 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
202 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
203 }
204
205 /* This code ensures unique mib indexes are handed out. */
206 static DEFINE_SPINLOCK(scsi_mib_index_lock);
207 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
208
209 /*
210 * Allocate a new row index for the entry type specified
211 */
212 u32 scsi_get_new_index(scsi_index_t type)
213 {
214 u32 new_index;
215
216 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
217
218 spin_lock(&scsi_mib_index_lock);
219 new_index = ++scsi_mib_index[type];
220 spin_unlock(&scsi_mib_index_lock);
221
222 return new_index;
223 }
224
225 void transport_init_queue_obj(struct se_queue_obj *qobj)
226 {
227 atomic_set(&qobj->queue_cnt, 0);
228 INIT_LIST_HEAD(&qobj->qobj_list);
229 init_waitqueue_head(&qobj->thread_wq);
230 spin_lock_init(&qobj->cmd_queue_lock);
231 }
232 EXPORT_SYMBOL(transport_init_queue_obj);
233
234 void transport_subsystem_check_init(void)
235 {
236 int ret;
237
238 if (sub_api_initialized)
239 return;
240
241 ret = request_module("target_core_iblock");
242 if (ret != 0)
243 pr_err("Unable to load target_core_iblock\n");
244
245 ret = request_module("target_core_file");
246 if (ret != 0)
247 pr_err("Unable to load target_core_file\n");
248
249 ret = request_module("target_core_pscsi");
250 if (ret != 0)
251 pr_err("Unable to load target_core_pscsi\n");
252
253 ret = request_module("target_core_stgt");
254 if (ret != 0)
255 pr_err("Unable to load target_core_stgt\n");
256
257 sub_api_initialized = 1;
258 return;
259 }
260
261 struct se_session *transport_init_session(void)
262 {
263 struct se_session *se_sess;
264
265 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
266 if (!se_sess) {
267 pr_err("Unable to allocate struct se_session from"
268 " se_sess_cache\n");
269 return ERR_PTR(-ENOMEM);
270 }
271 INIT_LIST_HEAD(&se_sess->sess_list);
272 INIT_LIST_HEAD(&se_sess->sess_acl_list);
273 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
274 INIT_LIST_HEAD(&se_sess->sess_wait_list);
275 spin_lock_init(&se_sess->sess_cmd_lock);
276
277 return se_sess;
278 }
279 EXPORT_SYMBOL(transport_init_session);
280
281 /*
282 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
283 */
284 void __transport_register_session(
285 struct se_portal_group *se_tpg,
286 struct se_node_acl *se_nacl,
287 struct se_session *se_sess,
288 void *fabric_sess_ptr)
289 {
290 unsigned char buf[PR_REG_ISID_LEN];
291
292 se_sess->se_tpg = se_tpg;
293 se_sess->fabric_sess_ptr = fabric_sess_ptr;
294 /*
295 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
296 *
297 * Only set for struct se_session's that will actually be moving I/O.
298 * eg: *NOT* discovery sessions.
299 */
300 if (se_nacl) {
301 /*
302 * If the fabric module supports an ISID based TransportID,
303 * save this value in binary from the fabric I_T Nexus now.
304 */
305 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
306 memset(&buf[0], 0, PR_REG_ISID_LEN);
307 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
308 &buf[0], PR_REG_ISID_LEN);
309 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
310 }
311 spin_lock_irq(&se_nacl->nacl_sess_lock);
312 /*
313 * The se_nacl->nacl_sess pointer will be set to the
314 * last active I_T Nexus for each struct se_node_acl.
315 */
316 se_nacl->nacl_sess = se_sess;
317
318 list_add_tail(&se_sess->sess_acl_list,
319 &se_nacl->acl_sess_list);
320 spin_unlock_irq(&se_nacl->nacl_sess_lock);
321 }
322 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
323
324 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
325 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
326 }
327 EXPORT_SYMBOL(__transport_register_session);
328
329 void transport_register_session(
330 struct se_portal_group *se_tpg,
331 struct se_node_acl *se_nacl,
332 struct se_session *se_sess,
333 void *fabric_sess_ptr)
334 {
335 spin_lock_bh(&se_tpg->session_lock);
336 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
337 spin_unlock_bh(&se_tpg->session_lock);
338 }
339 EXPORT_SYMBOL(transport_register_session);
340
341 void transport_deregister_session_configfs(struct se_session *se_sess)
342 {
343 struct se_node_acl *se_nacl;
344 unsigned long flags;
345 /*
346 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
347 */
348 se_nacl = se_sess->se_node_acl;
349 if (se_nacl) {
350 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
351 list_del(&se_sess->sess_acl_list);
352 /*
353 * If the session list is empty, then clear the pointer.
354 * Otherwise, set the struct se_session pointer from the tail
355 * element of the per struct se_node_acl active session list.
356 */
357 if (list_empty(&se_nacl->acl_sess_list))
358 se_nacl->nacl_sess = NULL;
359 else {
360 se_nacl->nacl_sess = container_of(
361 se_nacl->acl_sess_list.prev,
362 struct se_session, sess_acl_list);
363 }
364 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
365 }
366 }
367 EXPORT_SYMBOL(transport_deregister_session_configfs);
368
369 void transport_free_session(struct se_session *se_sess)
370 {
371 kmem_cache_free(se_sess_cache, se_sess);
372 }
373 EXPORT_SYMBOL(transport_free_session);
374
375 void transport_deregister_session(struct se_session *se_sess)
376 {
377 struct se_portal_group *se_tpg = se_sess->se_tpg;
378 struct se_node_acl *se_nacl;
379 unsigned long flags;
380
381 if (!se_tpg) {
382 transport_free_session(se_sess);
383 return;
384 }
385
386 spin_lock_irqsave(&se_tpg->session_lock, flags);
387 list_del(&se_sess->sess_list);
388 se_sess->se_tpg = NULL;
389 se_sess->fabric_sess_ptr = NULL;
390 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
391
392 /*
393 * Determine if we need to do extra work for this initiator node's
394 * struct se_node_acl if it had been previously dynamically generated.
395 */
396 se_nacl = se_sess->se_node_acl;
397 if (se_nacl) {
398 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
399 if (se_nacl->dynamic_node_acl) {
400 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
401 se_tpg)) {
402 list_del(&se_nacl->acl_list);
403 se_tpg->num_node_acls--;
404 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
405
406 core_tpg_wait_for_nacl_pr_ref(se_nacl);
407 core_free_device_list_for_node(se_nacl, se_tpg);
408 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
409 se_nacl);
410 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
411 }
412 }
413 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
414 }
415
416 transport_free_session(se_sess);
417
418 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
419 se_tpg->se_tpg_tfo->get_fabric_name());
420 }
421 EXPORT_SYMBOL(transport_deregister_session);
422
423 /*
424 * Called with cmd->t_state_lock held.
425 */
426 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
427 {
428 struct se_device *dev = cmd->se_dev;
429 struct se_task *task;
430 unsigned long flags;
431
432 if (!dev)
433 return;
434
435 list_for_each_entry(task, &cmd->t_task_list, t_list) {
436 if (task->task_flags & TF_ACTIVE)
437 continue;
438
439 if (!atomic_read(&task->task_state_active))
440 continue;
441
442 spin_lock_irqsave(&dev->execute_task_lock, flags);
443 list_del(&task->t_state_list);
444 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
445 cmd->se_tfo->get_task_tag(cmd), dev, task);
446 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
447
448 atomic_set(&task->task_state_active, 0);
449 atomic_dec(&cmd->t_task_cdbs_ex_left);
450 }
451 }
452
453 /* transport_cmd_check_stop():
454 *
455 * 'transport_off = 1' determines if t_transport_active should be cleared.
456 * 'transport_off = 2' determines if task_dev_state should be removed.
457 *
458 * A non-zero u8 t_state sets cmd->t_state.
459 * Returns 1 when command is stopped, else 0.
460 */
461 static int transport_cmd_check_stop(
462 struct se_cmd *cmd,
463 int transport_off,
464 u8 t_state)
465 {
466 unsigned long flags;
467
468 spin_lock_irqsave(&cmd->t_state_lock, flags);
469 /*
470 * Determine if IOCTL context caller in requesting the stopping of this
471 * command for LUN shutdown purposes.
472 */
473 if (atomic_read(&cmd->transport_lun_stop)) {
474 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
475 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
476 cmd->se_tfo->get_task_tag(cmd));
477
478 atomic_set(&cmd->t_transport_active, 0);
479 if (transport_off == 2)
480 transport_all_task_dev_remove_state(cmd);
481 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
482
483 complete(&cmd->transport_lun_stop_comp);
484 return 1;
485 }
486 /*
487 * Determine if frontend context caller is requesting the stopping of
488 * this command for frontend exceptions.
489 */
490 if (atomic_read(&cmd->t_transport_stop)) {
491 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
492 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
493 cmd->se_tfo->get_task_tag(cmd));
494
495 if (transport_off == 2)
496 transport_all_task_dev_remove_state(cmd);
497
498 /*
499 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
500 * to FE.
501 */
502 if (transport_off == 2)
503 cmd->se_lun = NULL;
504 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
505
506 complete(&cmd->t_transport_stop_comp);
507 return 1;
508 }
509 if (transport_off) {
510 atomic_set(&cmd->t_transport_active, 0);
511 if (transport_off == 2) {
512 transport_all_task_dev_remove_state(cmd);
513 /*
514 * Clear struct se_cmd->se_lun before the transport_off == 2
515 * handoff to fabric module.
516 */
517 cmd->se_lun = NULL;
518 /*
519 * Some fabric modules like tcm_loop can release
520 * their internally allocated I/O reference now and
521 * struct se_cmd now.
522 *
523 * Fabric modules are expected to return '1' here if the
524 * se_cmd being passed is released at this point,
525 * or zero if not being released.
526 */
527 if (cmd->se_tfo->check_stop_free != NULL) {
528 spin_unlock_irqrestore(
529 &cmd->t_state_lock, flags);
530
531 return cmd->se_tfo->check_stop_free(cmd);
532 }
533 }
534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
535
536 return 0;
537 } else if (t_state)
538 cmd->t_state = t_state;
539 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
540
541 return 0;
542 }
543
544 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
545 {
546 return transport_cmd_check_stop(cmd, 2, 0);
547 }
548
549 static void transport_lun_remove_cmd(struct se_cmd *cmd)
550 {
551 struct se_lun *lun = cmd->se_lun;
552 unsigned long flags;
553
554 if (!lun)
555 return;
556
557 spin_lock_irqsave(&cmd->t_state_lock, flags);
558 if (!atomic_read(&cmd->transport_dev_active)) {
559 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
560 goto check_lun;
561 }
562 atomic_set(&cmd->transport_dev_active, 0);
563 transport_all_task_dev_remove_state(cmd);
564 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
565
566
567 check_lun:
568 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
569 if (atomic_read(&cmd->transport_lun_active)) {
570 list_del(&cmd->se_lun_node);
571 atomic_set(&cmd->transport_lun_active, 0);
572 #if 0
573 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
574 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
575 #endif
576 }
577 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
578 }
579
580 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
581 {
582 if (!cmd->se_tmr_req)
583 transport_lun_remove_cmd(cmd);
584
585 if (transport_cmd_check_stop_to_fabric(cmd))
586 return;
587 if (remove) {
588 transport_remove_cmd_from_queue(cmd);
589 transport_put_cmd(cmd);
590 }
591 }
592
593 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
594 bool at_head)
595 {
596 struct se_device *dev = cmd->se_dev;
597 struct se_queue_obj *qobj = &dev->dev_queue_obj;
598 unsigned long flags;
599
600 if (t_state) {
601 spin_lock_irqsave(&cmd->t_state_lock, flags);
602 cmd->t_state = t_state;
603 atomic_set(&cmd->t_transport_active, 1);
604 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
605 }
606
607 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
608
609 /* If the cmd is already on the list, remove it before we add it */
610 if (!list_empty(&cmd->se_queue_node))
611 list_del(&cmd->se_queue_node);
612 else
613 atomic_inc(&qobj->queue_cnt);
614
615 if (at_head)
616 list_add(&cmd->se_queue_node, &qobj->qobj_list);
617 else
618 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
619 atomic_set(&cmd->t_transport_queue_active, 1);
620 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
621
622 wake_up_interruptible(&qobj->thread_wq);
623 }
624
625 static struct se_cmd *
626 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
627 {
628 struct se_cmd *cmd;
629 unsigned long flags;
630
631 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
632 if (list_empty(&qobj->qobj_list)) {
633 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
634 return NULL;
635 }
636 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
637
638 atomic_set(&cmd->t_transport_queue_active, 0);
639
640 list_del_init(&cmd->se_queue_node);
641 atomic_dec(&qobj->queue_cnt);
642 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
643
644 return cmd;
645 }
646
647 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
648 {
649 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
650 unsigned long flags;
651
652 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
653 if (!atomic_read(&cmd->t_transport_queue_active)) {
654 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
655 return;
656 }
657 atomic_set(&cmd->t_transport_queue_active, 0);
658 atomic_dec(&qobj->queue_cnt);
659 list_del_init(&cmd->se_queue_node);
660 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
661
662 if (atomic_read(&cmd->t_transport_queue_active)) {
663 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
664 cmd->se_tfo->get_task_tag(cmd),
665 atomic_read(&cmd->t_transport_queue_active));
666 }
667 }
668
669 /*
670 * Completion function used by TCM subsystem plugins (such as FILEIO)
671 * for queueing up response from struct se_subsystem_api->do_task()
672 */
673 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
674 {
675 struct se_task *task = list_entry(cmd->t_task_list.next,
676 struct se_task, t_list);
677
678 if (good) {
679 cmd->scsi_status = SAM_STAT_GOOD;
680 task->task_scsi_status = GOOD;
681 } else {
682 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
683 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
684 task->task_se_cmd->transport_error_status =
685 PYX_TRANSPORT_ILLEGAL_REQUEST;
686 }
687
688 transport_complete_task(task, good);
689 }
690 EXPORT_SYMBOL(transport_complete_sync_cache);
691
692 static void target_complete_failure_work(struct work_struct *work)
693 {
694 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
695
696 transport_generic_request_failure(cmd, 1, 1);
697 }
698
699 /* transport_complete_task():
700 *
701 * Called from interrupt and non interrupt context depending
702 * on the transport plugin.
703 */
704 void transport_complete_task(struct se_task *task, int success)
705 {
706 struct se_cmd *cmd = task->task_se_cmd;
707 struct se_device *dev = cmd->se_dev;
708 unsigned long flags;
709 #if 0
710 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
711 cmd->t_task_cdb[0], dev);
712 #endif
713 if (dev)
714 atomic_inc(&dev->depth_left);
715
716 spin_lock_irqsave(&cmd->t_state_lock, flags);
717 task->task_flags &= ~TF_ACTIVE;
718
719 /*
720 * See if any sense data exists, if so set the TASK_SENSE flag.
721 * Also check for any other post completion work that needs to be
722 * done by the plugins.
723 */
724 if (dev && dev->transport->transport_complete) {
725 if (dev->transport->transport_complete(task) != 0) {
726 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
727 task->task_sense = 1;
728 success = 1;
729 }
730 }
731
732 /*
733 * See if we are waiting for outstanding struct se_task
734 * to complete for an exception condition
735 */
736 if (task->task_flags & TF_REQUEST_STOP) {
737 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
738 complete(&task->task_stop_comp);
739 return;
740 }
741
742 if (!success)
743 cmd->t_tasks_failed = 1;
744
745 /*
746 * Decrement the outstanding t_task_cdbs_left count. The last
747 * struct se_task from struct se_cmd will complete itself into the
748 * device queue depending upon int success.
749 */
750 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
751 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
752 return;
753 }
754
755 if (cmd->t_tasks_failed) {
756 if (!task->task_error_status) {
757 task->task_error_status =
758 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
759 cmd->transport_error_status =
760 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
761 }
762 INIT_WORK(&cmd->work, target_complete_failure_work);
763 } else {
764 atomic_set(&cmd->t_transport_complete, 1);
765 INIT_WORK(&cmd->work, target_complete_ok_work);
766 }
767
768 cmd->t_state = TRANSPORT_COMPLETE;
769 atomic_set(&cmd->t_transport_active, 1);
770 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
771
772 queue_work(target_completion_wq, &cmd->work);
773 }
774 EXPORT_SYMBOL(transport_complete_task);
775
776 /*
777 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
778 * struct se_task list are ready to be added to the active execution list
779 * struct se_device
780
781 * Called with se_dev_t->execute_task_lock called.
782 */
783 static inline int transport_add_task_check_sam_attr(
784 struct se_task *task,
785 struct se_task *task_prev,
786 struct se_device *dev)
787 {
788 /*
789 * No SAM Task attribute emulation enabled, add to tail of
790 * execution queue
791 */
792 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
793 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
794 return 0;
795 }
796 /*
797 * HEAD_OF_QUEUE attribute for received CDB, which means
798 * the first task that is associated with a struct se_cmd goes to
799 * head of the struct se_device->execute_task_list, and task_prev
800 * after that for each subsequent task
801 */
802 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
803 list_add(&task->t_execute_list,
804 (task_prev != NULL) ?
805 &task_prev->t_execute_list :
806 &dev->execute_task_list);
807
808 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
809 " in execution queue\n",
810 task->task_se_cmd->t_task_cdb[0]);
811 return 1;
812 }
813 /*
814 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
815 * transitioned from Dermant -> Active state, and are added to the end
816 * of the struct se_device->execute_task_list
817 */
818 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
819 return 0;
820 }
821
822 /* __transport_add_task_to_execute_queue():
823 *
824 * Called with se_dev_t->execute_task_lock called.
825 */
826 static void __transport_add_task_to_execute_queue(
827 struct se_task *task,
828 struct se_task *task_prev,
829 struct se_device *dev)
830 {
831 int head_of_queue;
832
833 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
834 atomic_inc(&dev->execute_tasks);
835
836 if (atomic_read(&task->task_state_active))
837 return;
838 /*
839 * Determine if this task needs to go to HEAD_OF_QUEUE for the
840 * state list as well. Running with SAM Task Attribute emulation
841 * will always return head_of_queue == 0 here
842 */
843 if (head_of_queue)
844 list_add(&task->t_state_list, (task_prev) ?
845 &task_prev->t_state_list :
846 &dev->state_task_list);
847 else
848 list_add_tail(&task->t_state_list, &dev->state_task_list);
849
850 atomic_set(&task->task_state_active, 1);
851
852 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
853 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
854 task, dev);
855 }
856
857 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
858 {
859 struct se_device *dev = cmd->se_dev;
860 struct se_task *task;
861 unsigned long flags;
862
863 spin_lock_irqsave(&cmd->t_state_lock, flags);
864 list_for_each_entry(task, &cmd->t_task_list, t_list) {
865 if (atomic_read(&task->task_state_active))
866 continue;
867
868 spin_lock(&dev->execute_task_lock);
869 list_add_tail(&task->t_state_list, &dev->state_task_list);
870 atomic_set(&task->task_state_active, 1);
871
872 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
873 task->task_se_cmd->se_tfo->get_task_tag(
874 task->task_se_cmd), task, dev);
875
876 spin_unlock(&dev->execute_task_lock);
877 }
878 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
879 }
880
881 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
882 {
883 struct se_device *dev = cmd->se_dev;
884 struct se_task *task, *task_prev = NULL;
885 unsigned long flags;
886
887 spin_lock_irqsave(&dev->execute_task_lock, flags);
888 list_for_each_entry(task, &cmd->t_task_list, t_list) {
889 if (!list_empty(&task->t_execute_list))
890 continue;
891 /*
892 * __transport_add_task_to_execute_queue() handles the
893 * SAM Task Attribute emulation if enabled
894 */
895 __transport_add_task_to_execute_queue(task, task_prev, dev);
896 task_prev = task;
897 }
898 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
899 }
900
901 void __transport_remove_task_from_execute_queue(struct se_task *task,
902 struct se_device *dev)
903 {
904 list_del_init(&task->t_execute_list);
905 atomic_dec(&dev->execute_tasks);
906 }
907
908 void transport_remove_task_from_execute_queue(
909 struct se_task *task,
910 struct se_device *dev)
911 {
912 unsigned long flags;
913
914 if (WARN_ON(list_empty(&task->t_execute_list)))
915 return;
916
917 spin_lock_irqsave(&dev->execute_task_lock, flags);
918 __transport_remove_task_from_execute_queue(task, dev);
919 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
920 }
921
922 /*
923 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
924 */
925
926 static void target_qf_do_work(struct work_struct *work)
927 {
928 struct se_device *dev = container_of(work, struct se_device,
929 qf_work_queue);
930 LIST_HEAD(qf_cmd_list);
931 struct se_cmd *cmd, *cmd_tmp;
932
933 spin_lock_irq(&dev->qf_cmd_lock);
934 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
935 spin_unlock_irq(&dev->qf_cmd_lock);
936
937 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
938 list_del(&cmd->se_qf_node);
939 atomic_dec(&dev->dev_qf_count);
940 smp_mb__after_atomic_dec();
941
942 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
943 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
944 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
945 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
946 : "UNKNOWN");
947
948 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
949 }
950 }
951
952 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
953 {
954 switch (cmd->data_direction) {
955 case DMA_NONE:
956 return "NONE";
957 case DMA_FROM_DEVICE:
958 return "READ";
959 case DMA_TO_DEVICE:
960 return "WRITE";
961 case DMA_BIDIRECTIONAL:
962 return "BIDI";
963 default:
964 break;
965 }
966
967 return "UNKNOWN";
968 }
969
970 void transport_dump_dev_state(
971 struct se_device *dev,
972 char *b,
973 int *bl)
974 {
975 *bl += sprintf(b + *bl, "Status: ");
976 switch (dev->dev_status) {
977 case TRANSPORT_DEVICE_ACTIVATED:
978 *bl += sprintf(b + *bl, "ACTIVATED");
979 break;
980 case TRANSPORT_DEVICE_DEACTIVATED:
981 *bl += sprintf(b + *bl, "DEACTIVATED");
982 break;
983 case TRANSPORT_DEVICE_SHUTDOWN:
984 *bl += sprintf(b + *bl, "SHUTDOWN");
985 break;
986 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
987 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
988 *bl += sprintf(b + *bl, "OFFLINE");
989 break;
990 default:
991 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
992 break;
993 }
994
995 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
996 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
997 dev->queue_depth);
998 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
999 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1000 *bl += sprintf(b + *bl, " ");
1001 }
1002
1003 void transport_dump_vpd_proto_id(
1004 struct t10_vpd *vpd,
1005 unsigned char *p_buf,
1006 int p_buf_len)
1007 {
1008 unsigned char buf[VPD_TMP_BUF_SIZE];
1009 int len;
1010
1011 memset(buf, 0, VPD_TMP_BUF_SIZE);
1012 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1013
1014 switch (vpd->protocol_identifier) {
1015 case 0x00:
1016 sprintf(buf+len, "Fibre Channel\n");
1017 break;
1018 case 0x10:
1019 sprintf(buf+len, "Parallel SCSI\n");
1020 break;
1021 case 0x20:
1022 sprintf(buf+len, "SSA\n");
1023 break;
1024 case 0x30:
1025 sprintf(buf+len, "IEEE 1394\n");
1026 break;
1027 case 0x40:
1028 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1029 " Protocol\n");
1030 break;
1031 case 0x50:
1032 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1033 break;
1034 case 0x60:
1035 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1036 break;
1037 case 0x70:
1038 sprintf(buf+len, "Automation/Drive Interface Transport"
1039 " Protocol\n");
1040 break;
1041 case 0x80:
1042 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1043 break;
1044 default:
1045 sprintf(buf+len, "Unknown 0x%02x\n",
1046 vpd->protocol_identifier);
1047 break;
1048 }
1049
1050 if (p_buf)
1051 strncpy(p_buf, buf, p_buf_len);
1052 else
1053 pr_debug("%s", buf);
1054 }
1055
1056 void
1057 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1058 {
1059 /*
1060 * Check if the Protocol Identifier Valid (PIV) bit is set..
1061 *
1062 * from spc3r23.pdf section 7.5.1
1063 */
1064 if (page_83[1] & 0x80) {
1065 vpd->protocol_identifier = (page_83[0] & 0xf0);
1066 vpd->protocol_identifier_set = 1;
1067 transport_dump_vpd_proto_id(vpd, NULL, 0);
1068 }
1069 }
1070 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1071
1072 int transport_dump_vpd_assoc(
1073 struct t10_vpd *vpd,
1074 unsigned char *p_buf,
1075 int p_buf_len)
1076 {
1077 unsigned char buf[VPD_TMP_BUF_SIZE];
1078 int ret = 0;
1079 int len;
1080
1081 memset(buf, 0, VPD_TMP_BUF_SIZE);
1082 len = sprintf(buf, "T10 VPD Identifier Association: ");
1083
1084 switch (vpd->association) {
1085 case 0x00:
1086 sprintf(buf+len, "addressed logical unit\n");
1087 break;
1088 case 0x10:
1089 sprintf(buf+len, "target port\n");
1090 break;
1091 case 0x20:
1092 sprintf(buf+len, "SCSI target device\n");
1093 break;
1094 default:
1095 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1096 ret = -EINVAL;
1097 break;
1098 }
1099
1100 if (p_buf)
1101 strncpy(p_buf, buf, p_buf_len);
1102 else
1103 pr_debug("%s", buf);
1104
1105 return ret;
1106 }
1107
1108 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1109 {
1110 /*
1111 * The VPD identification association..
1112 *
1113 * from spc3r23.pdf Section 7.6.3.1 Table 297
1114 */
1115 vpd->association = (page_83[1] & 0x30);
1116 return transport_dump_vpd_assoc(vpd, NULL, 0);
1117 }
1118 EXPORT_SYMBOL(transport_set_vpd_assoc);
1119
1120 int transport_dump_vpd_ident_type(
1121 struct t10_vpd *vpd,
1122 unsigned char *p_buf,
1123 int p_buf_len)
1124 {
1125 unsigned char buf[VPD_TMP_BUF_SIZE];
1126 int ret = 0;
1127 int len;
1128
1129 memset(buf, 0, VPD_TMP_BUF_SIZE);
1130 len = sprintf(buf, "T10 VPD Identifier Type: ");
1131
1132 switch (vpd->device_identifier_type) {
1133 case 0x00:
1134 sprintf(buf+len, "Vendor specific\n");
1135 break;
1136 case 0x01:
1137 sprintf(buf+len, "T10 Vendor ID based\n");
1138 break;
1139 case 0x02:
1140 sprintf(buf+len, "EUI-64 based\n");
1141 break;
1142 case 0x03:
1143 sprintf(buf+len, "NAA\n");
1144 break;
1145 case 0x04:
1146 sprintf(buf+len, "Relative target port identifier\n");
1147 break;
1148 case 0x08:
1149 sprintf(buf+len, "SCSI name string\n");
1150 break;
1151 default:
1152 sprintf(buf+len, "Unsupported: 0x%02x\n",
1153 vpd->device_identifier_type);
1154 ret = -EINVAL;
1155 break;
1156 }
1157
1158 if (p_buf) {
1159 if (p_buf_len < strlen(buf)+1)
1160 return -EINVAL;
1161 strncpy(p_buf, buf, p_buf_len);
1162 } else {
1163 pr_debug("%s", buf);
1164 }
1165
1166 return ret;
1167 }
1168
1169 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1170 {
1171 /*
1172 * The VPD identifier type..
1173 *
1174 * from spc3r23.pdf Section 7.6.3.1 Table 298
1175 */
1176 vpd->device_identifier_type = (page_83[1] & 0x0f);
1177 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1178 }
1179 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1180
1181 int transport_dump_vpd_ident(
1182 struct t10_vpd *vpd,
1183 unsigned char *p_buf,
1184 int p_buf_len)
1185 {
1186 unsigned char buf[VPD_TMP_BUF_SIZE];
1187 int ret = 0;
1188
1189 memset(buf, 0, VPD_TMP_BUF_SIZE);
1190
1191 switch (vpd->device_identifier_code_set) {
1192 case 0x01: /* Binary */
1193 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1194 &vpd->device_identifier[0]);
1195 break;
1196 case 0x02: /* ASCII */
1197 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1198 &vpd->device_identifier[0]);
1199 break;
1200 case 0x03: /* UTF-8 */
1201 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1202 &vpd->device_identifier[0]);
1203 break;
1204 default:
1205 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1206 " 0x%02x", vpd->device_identifier_code_set);
1207 ret = -EINVAL;
1208 break;
1209 }
1210
1211 if (p_buf)
1212 strncpy(p_buf, buf, p_buf_len);
1213 else
1214 pr_debug("%s", buf);
1215
1216 return ret;
1217 }
1218
1219 int
1220 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1221 {
1222 static const char hex_str[] = "0123456789abcdef";
1223 int j = 0, i = 4; /* offset to start of the identifer */
1224
1225 /*
1226 * The VPD Code Set (encoding)
1227 *
1228 * from spc3r23.pdf Section 7.6.3.1 Table 296
1229 */
1230 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1231 switch (vpd->device_identifier_code_set) {
1232 case 0x01: /* Binary */
1233 vpd->device_identifier[j++] =
1234 hex_str[vpd->device_identifier_type];
1235 while (i < (4 + page_83[3])) {
1236 vpd->device_identifier[j++] =
1237 hex_str[(page_83[i] & 0xf0) >> 4];
1238 vpd->device_identifier[j++] =
1239 hex_str[page_83[i] & 0x0f];
1240 i++;
1241 }
1242 break;
1243 case 0x02: /* ASCII */
1244 case 0x03: /* UTF-8 */
1245 while (i < (4 + page_83[3]))
1246 vpd->device_identifier[j++] = page_83[i++];
1247 break;
1248 default:
1249 break;
1250 }
1251
1252 return transport_dump_vpd_ident(vpd, NULL, 0);
1253 }
1254 EXPORT_SYMBOL(transport_set_vpd_ident);
1255
1256 static void core_setup_task_attr_emulation(struct se_device *dev)
1257 {
1258 /*
1259 * If this device is from Target_Core_Mod/pSCSI, disable the
1260 * SAM Task Attribute emulation.
1261 *
1262 * This is currently not available in upsream Linux/SCSI Target
1263 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1264 */
1265 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1266 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1267 return;
1268 }
1269
1270 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1271 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1272 " device\n", dev->transport->name,
1273 dev->transport->get_device_rev(dev));
1274 }
1275
1276 static void scsi_dump_inquiry(struct se_device *dev)
1277 {
1278 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1279 int i, device_type;
1280 /*
1281 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1282 */
1283 pr_debug(" Vendor: ");
1284 for (i = 0; i < 8; i++)
1285 if (wwn->vendor[i] >= 0x20)
1286 pr_debug("%c", wwn->vendor[i]);
1287 else
1288 pr_debug(" ");
1289
1290 pr_debug(" Model: ");
1291 for (i = 0; i < 16; i++)
1292 if (wwn->model[i] >= 0x20)
1293 pr_debug("%c", wwn->model[i]);
1294 else
1295 pr_debug(" ");
1296
1297 pr_debug(" Revision: ");
1298 for (i = 0; i < 4; i++)
1299 if (wwn->revision[i] >= 0x20)
1300 pr_debug("%c", wwn->revision[i]);
1301 else
1302 pr_debug(" ");
1303
1304 pr_debug("\n");
1305
1306 device_type = dev->transport->get_device_type(dev);
1307 pr_debug(" Type: %s ", scsi_device_type(device_type));
1308 pr_debug(" ANSI SCSI revision: %02x\n",
1309 dev->transport->get_device_rev(dev));
1310 }
1311
1312 struct se_device *transport_add_device_to_core_hba(
1313 struct se_hba *hba,
1314 struct se_subsystem_api *transport,
1315 struct se_subsystem_dev *se_dev,
1316 u32 device_flags,
1317 void *transport_dev,
1318 struct se_dev_limits *dev_limits,
1319 const char *inquiry_prod,
1320 const char *inquiry_rev)
1321 {
1322 int force_pt;
1323 struct se_device *dev;
1324
1325 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1326 if (!dev) {
1327 pr_err("Unable to allocate memory for se_dev_t\n");
1328 return NULL;
1329 }
1330
1331 transport_init_queue_obj(&dev->dev_queue_obj);
1332 dev->dev_flags = device_flags;
1333 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1334 dev->dev_ptr = transport_dev;
1335 dev->se_hba = hba;
1336 dev->se_sub_dev = se_dev;
1337 dev->transport = transport;
1338 atomic_set(&dev->active_cmds, 0);
1339 INIT_LIST_HEAD(&dev->dev_list);
1340 INIT_LIST_HEAD(&dev->dev_sep_list);
1341 INIT_LIST_HEAD(&dev->dev_tmr_list);
1342 INIT_LIST_HEAD(&dev->execute_task_list);
1343 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1344 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1345 INIT_LIST_HEAD(&dev->state_task_list);
1346 INIT_LIST_HEAD(&dev->qf_cmd_list);
1347 spin_lock_init(&dev->execute_task_lock);
1348 spin_lock_init(&dev->delayed_cmd_lock);
1349 spin_lock_init(&dev->ordered_cmd_lock);
1350 spin_lock_init(&dev->state_task_lock);
1351 spin_lock_init(&dev->dev_alua_lock);
1352 spin_lock_init(&dev->dev_reservation_lock);
1353 spin_lock_init(&dev->dev_status_lock);
1354 spin_lock_init(&dev->dev_status_thr_lock);
1355 spin_lock_init(&dev->se_port_lock);
1356 spin_lock_init(&dev->se_tmr_lock);
1357 spin_lock_init(&dev->qf_cmd_lock);
1358
1359 dev->queue_depth = dev_limits->queue_depth;
1360 atomic_set(&dev->depth_left, dev->queue_depth);
1361 atomic_set(&dev->dev_ordered_id, 0);
1362
1363 se_dev_set_default_attribs(dev, dev_limits);
1364
1365 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1366 dev->creation_time = get_jiffies_64();
1367 spin_lock_init(&dev->stats_lock);
1368
1369 spin_lock(&hba->device_lock);
1370 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1371 hba->dev_count++;
1372 spin_unlock(&hba->device_lock);
1373 /*
1374 * Setup the SAM Task Attribute emulation for struct se_device
1375 */
1376 core_setup_task_attr_emulation(dev);
1377 /*
1378 * Force PR and ALUA passthrough emulation with internal object use.
1379 */
1380 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1381 /*
1382 * Setup the Reservations infrastructure for struct se_device
1383 */
1384 core_setup_reservations(dev, force_pt);
1385 /*
1386 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1387 */
1388 if (core_setup_alua(dev, force_pt) < 0)
1389 goto out;
1390
1391 /*
1392 * Startup the struct se_device processing thread
1393 */
1394 dev->process_thread = kthread_run(transport_processing_thread, dev,
1395 "LIO_%s", dev->transport->name);
1396 if (IS_ERR(dev->process_thread)) {
1397 pr_err("Unable to create kthread: LIO_%s\n",
1398 dev->transport->name);
1399 goto out;
1400 }
1401 /*
1402 * Setup work_queue for QUEUE_FULL
1403 */
1404 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1405 /*
1406 * Preload the initial INQUIRY const values if we are doing
1407 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1408 * passthrough because this is being provided by the backend LLD.
1409 * This is required so that transport_get_inquiry() copies these
1410 * originals once back into DEV_T10_WWN(dev) for the virtual device
1411 * setup.
1412 */
1413 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1414 if (!inquiry_prod || !inquiry_rev) {
1415 pr_err("All non TCM/pSCSI plugins require"
1416 " INQUIRY consts\n");
1417 goto out;
1418 }
1419
1420 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1421 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1422 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1423 }
1424 scsi_dump_inquiry(dev);
1425
1426 return dev;
1427 out:
1428 kthread_stop(dev->process_thread);
1429
1430 spin_lock(&hba->device_lock);
1431 list_del(&dev->dev_list);
1432 hba->dev_count--;
1433 spin_unlock(&hba->device_lock);
1434
1435 se_release_vpd_for_dev(dev);
1436
1437 kfree(dev);
1438
1439 return NULL;
1440 }
1441 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1442
1443 /* transport_generic_prepare_cdb():
1444 *
1445 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1446 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1447 * The point of this is since we are mapping iSCSI LUNs to
1448 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1449 * devices and HBAs for a loop.
1450 */
1451 static inline void transport_generic_prepare_cdb(
1452 unsigned char *cdb)
1453 {
1454 switch (cdb[0]) {
1455 case READ_10: /* SBC - RDProtect */
1456 case READ_12: /* SBC - RDProtect */
1457 case READ_16: /* SBC - RDProtect */
1458 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1459 case VERIFY: /* SBC - VRProtect */
1460 case VERIFY_16: /* SBC - VRProtect */
1461 case WRITE_VERIFY: /* SBC - VRProtect */
1462 case WRITE_VERIFY_12: /* SBC - VRProtect */
1463 break;
1464 default:
1465 cdb[1] &= 0x1f; /* clear logical unit number */
1466 break;
1467 }
1468 }
1469
1470 static struct se_task *
1471 transport_generic_get_task(struct se_cmd *cmd,
1472 enum dma_data_direction data_direction)
1473 {
1474 struct se_task *task;
1475 struct se_device *dev = cmd->se_dev;
1476
1477 task = dev->transport->alloc_task(cmd->t_task_cdb);
1478 if (!task) {
1479 pr_err("Unable to allocate struct se_task\n");
1480 return NULL;
1481 }
1482
1483 INIT_LIST_HEAD(&task->t_list);
1484 INIT_LIST_HEAD(&task->t_execute_list);
1485 INIT_LIST_HEAD(&task->t_state_list);
1486 init_completion(&task->task_stop_comp);
1487 task->task_se_cmd = cmd;
1488 task->task_data_direction = data_direction;
1489
1490 return task;
1491 }
1492
1493 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1494
1495 /*
1496 * Used by fabric modules containing a local struct se_cmd within their
1497 * fabric dependent per I/O descriptor.
1498 */
1499 void transport_init_se_cmd(
1500 struct se_cmd *cmd,
1501 struct target_core_fabric_ops *tfo,
1502 struct se_session *se_sess,
1503 u32 data_length,
1504 int data_direction,
1505 int task_attr,
1506 unsigned char *sense_buffer)
1507 {
1508 INIT_LIST_HEAD(&cmd->se_lun_node);
1509 INIT_LIST_HEAD(&cmd->se_delayed_node);
1510 INIT_LIST_HEAD(&cmd->se_ordered_node);
1511 INIT_LIST_HEAD(&cmd->se_qf_node);
1512 INIT_LIST_HEAD(&cmd->se_queue_node);
1513 INIT_LIST_HEAD(&cmd->se_cmd_list);
1514 INIT_LIST_HEAD(&cmd->t_task_list);
1515 init_completion(&cmd->transport_lun_fe_stop_comp);
1516 init_completion(&cmd->transport_lun_stop_comp);
1517 init_completion(&cmd->t_transport_stop_comp);
1518 init_completion(&cmd->cmd_wait_comp);
1519 spin_lock_init(&cmd->t_state_lock);
1520 atomic_set(&cmd->transport_dev_active, 1);
1521
1522 cmd->se_tfo = tfo;
1523 cmd->se_sess = se_sess;
1524 cmd->data_length = data_length;
1525 cmd->data_direction = data_direction;
1526 cmd->sam_task_attr = task_attr;
1527 cmd->sense_buffer = sense_buffer;
1528 }
1529 EXPORT_SYMBOL(transport_init_se_cmd);
1530
1531 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1532 {
1533 /*
1534 * Check if SAM Task Attribute emulation is enabled for this
1535 * struct se_device storage object
1536 */
1537 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1538 return 0;
1539
1540 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1541 pr_debug("SAM Task Attribute ACA"
1542 " emulation is not supported\n");
1543 return -EINVAL;
1544 }
1545 /*
1546 * Used to determine when ORDERED commands should go from
1547 * Dormant to Active status.
1548 */
1549 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1550 smp_mb__after_atomic_inc();
1551 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1552 cmd->se_ordered_id, cmd->sam_task_attr,
1553 cmd->se_dev->transport->name);
1554 return 0;
1555 }
1556
1557 /* transport_generic_allocate_tasks():
1558 *
1559 * Called from fabric RX Thread.
1560 */
1561 int transport_generic_allocate_tasks(
1562 struct se_cmd *cmd,
1563 unsigned char *cdb)
1564 {
1565 int ret;
1566
1567 transport_generic_prepare_cdb(cdb);
1568 /*
1569 * Ensure that the received CDB is less than the max (252 + 8) bytes
1570 * for VARIABLE_LENGTH_CMD
1571 */
1572 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1573 pr_err("Received SCSI CDB with command_size: %d that"
1574 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1575 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1576 return -EINVAL;
1577 }
1578 /*
1579 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1580 * allocate the additional extended CDB buffer now.. Otherwise
1581 * setup the pointer from __t_task_cdb to t_task_cdb.
1582 */
1583 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1584 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1585 GFP_KERNEL);
1586 if (!cmd->t_task_cdb) {
1587 pr_err("Unable to allocate cmd->t_task_cdb"
1588 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1589 scsi_command_size(cdb),
1590 (unsigned long)sizeof(cmd->__t_task_cdb));
1591 return -ENOMEM;
1592 }
1593 } else
1594 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1595 /*
1596 * Copy the original CDB into cmd->
1597 */
1598 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1599 /*
1600 * Setup the received CDB based on SCSI defined opcodes and
1601 * perform unit attention, persistent reservations and ALUA
1602 * checks for virtual device backends. The cmd->t_task_cdb
1603 * pointer is expected to be setup before we reach this point.
1604 */
1605 ret = transport_generic_cmd_sequencer(cmd, cdb);
1606 if (ret < 0)
1607 return ret;
1608 /*
1609 * Check for SAM Task Attribute Emulation
1610 */
1611 if (transport_check_alloc_task_attr(cmd) < 0) {
1612 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1613 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1614 return -EINVAL;
1615 }
1616 spin_lock(&cmd->se_lun->lun_sep_lock);
1617 if (cmd->se_lun->lun_sep)
1618 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1619 spin_unlock(&cmd->se_lun->lun_sep_lock);
1620 return 0;
1621 }
1622 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1623
1624 /*
1625 * Used by fabric module frontends to queue tasks directly.
1626 * Many only be used from process context only
1627 */
1628 int transport_handle_cdb_direct(
1629 struct se_cmd *cmd)
1630 {
1631 int ret;
1632
1633 if (!cmd->se_lun) {
1634 dump_stack();
1635 pr_err("cmd->se_lun is NULL\n");
1636 return -EINVAL;
1637 }
1638 if (in_interrupt()) {
1639 dump_stack();
1640 pr_err("transport_generic_handle_cdb cannot be called"
1641 " from interrupt context\n");
1642 return -EINVAL;
1643 }
1644 /*
1645 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1646 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1647 * in existing usage to ensure that outstanding descriptors are handled
1648 * correctly during shutdown via transport_wait_for_tasks()
1649 *
1650 * Also, we don't take cmd->t_state_lock here as we only expect
1651 * this to be called for initial descriptor submission.
1652 */
1653 cmd->t_state = TRANSPORT_NEW_CMD;
1654 atomic_set(&cmd->t_transport_active, 1);
1655 /*
1656 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1657 * so follow TRANSPORT_NEW_CMD processing thread context usage
1658 * and call transport_generic_request_failure() if necessary..
1659 */
1660 ret = transport_generic_new_cmd(cmd);
1661 if (ret < 0) {
1662 cmd->transport_error_status = ret;
1663 transport_generic_request_failure(cmd, 0,
1664 (cmd->data_direction != DMA_TO_DEVICE));
1665 }
1666 return 0;
1667 }
1668 EXPORT_SYMBOL(transport_handle_cdb_direct);
1669
1670 /*
1671 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1672 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1673 * complete setup in TCM process context w/ TFO->new_cmd_map().
1674 */
1675 int transport_generic_handle_cdb_map(
1676 struct se_cmd *cmd)
1677 {
1678 if (!cmd->se_lun) {
1679 dump_stack();
1680 pr_err("cmd->se_lun is NULL\n");
1681 return -EINVAL;
1682 }
1683
1684 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1685 return 0;
1686 }
1687 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1688
1689 /* transport_generic_handle_data():
1690 *
1691 *
1692 */
1693 int transport_generic_handle_data(
1694 struct se_cmd *cmd)
1695 {
1696 /*
1697 * For the software fabric case, then we assume the nexus is being
1698 * failed/shutdown when signals are pending from the kthread context
1699 * caller, so we return a failure. For the HW target mode case running
1700 * in interrupt code, the signal_pending() check is skipped.
1701 */
1702 if (!in_interrupt() && signal_pending(current))
1703 return -EPERM;
1704 /*
1705 * If the received CDB has aleady been ABORTED by the generic
1706 * target engine, we now call transport_check_aborted_status()
1707 * to queue any delated TASK_ABORTED status for the received CDB to the
1708 * fabric module as we are expecting no further incoming DATA OUT
1709 * sequences at this point.
1710 */
1711 if (transport_check_aborted_status(cmd, 1) != 0)
1712 return 0;
1713
1714 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1715 return 0;
1716 }
1717 EXPORT_SYMBOL(transport_generic_handle_data);
1718
1719 /* transport_generic_handle_tmr():
1720 *
1721 *
1722 */
1723 int transport_generic_handle_tmr(
1724 struct se_cmd *cmd)
1725 {
1726 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1727 return 0;
1728 }
1729 EXPORT_SYMBOL(transport_generic_handle_tmr);
1730
1731 /*
1732 * If the task is active, request it to be stopped and sleep until it
1733 * has completed.
1734 */
1735 bool target_stop_task(struct se_task *task, unsigned long *flags)
1736 {
1737 struct se_cmd *cmd = task->task_se_cmd;
1738 bool was_active = false;
1739
1740 if (task->task_flags & TF_ACTIVE) {
1741 task->task_flags |= TF_REQUEST_STOP;
1742 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1743
1744 pr_debug("Task %p waiting to complete\n", task);
1745 wait_for_completion(&task->task_stop_comp);
1746 pr_debug("Task %p stopped successfully\n", task);
1747
1748 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1749 atomic_dec(&cmd->t_task_cdbs_left);
1750 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1751 was_active = true;
1752 }
1753
1754 return was_active;
1755 }
1756
1757 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1758 {
1759 struct se_task *task, *task_tmp;
1760 unsigned long flags;
1761 int ret = 0;
1762
1763 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1764 cmd->se_tfo->get_task_tag(cmd));
1765
1766 /*
1767 * No tasks remain in the execution queue
1768 */
1769 spin_lock_irqsave(&cmd->t_state_lock, flags);
1770 list_for_each_entry_safe(task, task_tmp,
1771 &cmd->t_task_list, t_list) {
1772 pr_debug("Processing task %p\n", task);
1773 /*
1774 * If the struct se_task has not been sent and is not active,
1775 * remove the struct se_task from the execution queue.
1776 */
1777 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1778 spin_unlock_irqrestore(&cmd->t_state_lock,
1779 flags);
1780 transport_remove_task_from_execute_queue(task,
1781 cmd->se_dev);
1782
1783 pr_debug("Task %p removed from execute queue\n", task);
1784 spin_lock_irqsave(&cmd->t_state_lock, flags);
1785 continue;
1786 }
1787
1788 if (!target_stop_task(task, &flags)) {
1789 pr_debug("Task %p - did nothing\n", task);
1790 ret++;
1791 }
1792 }
1793 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1794
1795 return ret;
1796 }
1797
1798 /*
1799 * Handle SAM-esque emulation for generic transport request failures.
1800 */
1801 static void transport_generic_request_failure(
1802 struct se_cmd *cmd,
1803 int complete,
1804 int sc)
1805 {
1806 int ret = 0;
1807
1808 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1809 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1810 cmd->t_task_cdb[0]);
1811 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
1812 cmd->se_tfo->get_cmd_state(cmd),
1813 cmd->t_state,
1814 cmd->transport_error_status);
1815 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1816 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1817 " t_transport_active: %d t_transport_stop: %d"
1818 " t_transport_sent: %d\n", cmd->t_task_list_num,
1819 atomic_read(&cmd->t_task_cdbs_left),
1820 atomic_read(&cmd->t_task_cdbs_sent),
1821 atomic_read(&cmd->t_task_cdbs_ex_left),
1822 atomic_read(&cmd->t_transport_active),
1823 atomic_read(&cmd->t_transport_stop),
1824 atomic_read(&cmd->t_transport_sent));
1825
1826 /*
1827 * For SAM Task Attribute emulation for failed struct se_cmd
1828 */
1829 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1830 transport_complete_task_attr(cmd);
1831
1832 if (complete) {
1833 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1834 }
1835
1836 switch (cmd->transport_error_status) {
1837 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1838 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1839 break;
1840 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1841 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1842 break;
1843 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1844 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1845 break;
1846 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1847 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1848 break;
1849 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1850 if (!sc)
1851 transport_new_cmd_failure(cmd);
1852 /*
1853 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1854 * we force this session to fall back to session
1855 * recovery.
1856 */
1857 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1858 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1859
1860 goto check_stop;
1861 case PYX_TRANSPORT_LU_COMM_FAILURE:
1862 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1863 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1864 break;
1865 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1866 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1867 break;
1868 case PYX_TRANSPORT_WRITE_PROTECTED:
1869 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1870 break;
1871 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1872 /*
1873 * No SENSE Data payload for this case, set SCSI Status
1874 * and queue the response to $FABRIC_MOD.
1875 *
1876 * Uses linux/include/scsi/scsi.h SAM status codes defs
1877 */
1878 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1879 /*
1880 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1881 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1882 * CONFLICT STATUS.
1883 *
1884 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1885 */
1886 if (cmd->se_sess &&
1887 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1888 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1889 cmd->orig_fe_lun, 0x2C,
1890 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1891
1892 ret = cmd->se_tfo->queue_status(cmd);
1893 if (ret == -EAGAIN || ret == -ENOMEM)
1894 goto queue_full;
1895 goto check_stop;
1896 case PYX_TRANSPORT_USE_SENSE_REASON:
1897 /*
1898 * struct se_cmd->scsi_sense_reason already set
1899 */
1900 break;
1901 default:
1902 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1903 cmd->t_task_cdb[0],
1904 cmd->transport_error_status);
1905 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1906 break;
1907 }
1908 /*
1909 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1910 * make the call to transport_send_check_condition_and_sense()
1911 * directly. Otherwise expect the fabric to make the call to
1912 * transport_send_check_condition_and_sense() after handling
1913 * possible unsoliticied write data payloads.
1914 */
1915 if (!sc && !cmd->se_tfo->new_cmd_map)
1916 transport_new_cmd_failure(cmd);
1917 else {
1918 ret = transport_send_check_condition_and_sense(cmd,
1919 cmd->scsi_sense_reason, 0);
1920 if (ret == -EAGAIN || ret == -ENOMEM)
1921 goto queue_full;
1922 }
1923
1924 check_stop:
1925 transport_lun_remove_cmd(cmd);
1926 if (!transport_cmd_check_stop_to_fabric(cmd))
1927 ;
1928 return;
1929
1930 queue_full:
1931 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1932 transport_handle_queue_full(cmd, cmd->se_dev);
1933 }
1934
1935 static inline u32 transport_lba_21(unsigned char *cdb)
1936 {
1937 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1938 }
1939
1940 static inline u32 transport_lba_32(unsigned char *cdb)
1941 {
1942 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1943 }
1944
1945 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1946 {
1947 unsigned int __v1, __v2;
1948
1949 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1950 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1951
1952 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1953 }
1954
1955 /*
1956 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1957 */
1958 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1959 {
1960 unsigned int __v1, __v2;
1961
1962 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1963 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1964
1965 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1966 }
1967
1968 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1969 {
1970 unsigned long flags;
1971
1972 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1973 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1974 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1975 }
1976
1977 static inline int transport_tcq_window_closed(struct se_device *dev)
1978 {
1979 if (dev->dev_tcq_window_closed++ <
1980 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1981 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1982 } else
1983 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1984
1985 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
1986 return 0;
1987 }
1988
1989 /*
1990 * Called from Fabric Module context from transport_execute_tasks()
1991 *
1992 * The return of this function determins if the tasks from struct se_cmd
1993 * get added to the execution queue in transport_execute_tasks(),
1994 * or are added to the delayed or ordered lists here.
1995 */
1996 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1997 {
1998 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1999 return 1;
2000 /*
2001 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2002 * to allow the passed struct se_cmd list of tasks to the front of the list.
2003 */
2004 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2005 atomic_inc(&cmd->se_dev->dev_hoq_count);
2006 smp_mb__after_atomic_inc();
2007 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2008 " 0x%02x, se_ordered_id: %u\n",
2009 cmd->t_task_cdb[0],
2010 cmd->se_ordered_id);
2011 return 1;
2012 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2013 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2014 list_add_tail(&cmd->se_ordered_node,
2015 &cmd->se_dev->ordered_cmd_list);
2016 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2017
2018 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2019 smp_mb__after_atomic_inc();
2020
2021 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2022 " list, se_ordered_id: %u\n",
2023 cmd->t_task_cdb[0],
2024 cmd->se_ordered_id);
2025 /*
2026 * Add ORDERED command to tail of execution queue if
2027 * no other older commands exist that need to be
2028 * completed first.
2029 */
2030 if (!atomic_read(&cmd->se_dev->simple_cmds))
2031 return 1;
2032 } else {
2033 /*
2034 * For SIMPLE and UNTAGGED Task Attribute commands
2035 */
2036 atomic_inc(&cmd->se_dev->simple_cmds);
2037 smp_mb__after_atomic_inc();
2038 }
2039 /*
2040 * Otherwise if one or more outstanding ORDERED task attribute exist,
2041 * add the dormant task(s) built for the passed struct se_cmd to the
2042 * execution queue and become in Active state for this struct se_device.
2043 */
2044 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2045 /*
2046 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2047 * will be drained upon completion of HEAD_OF_QUEUE task.
2048 */
2049 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2050 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2051 list_add_tail(&cmd->se_delayed_node,
2052 &cmd->se_dev->delayed_cmd_list);
2053 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2054
2055 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2056 " delayed CMD list, se_ordered_id: %u\n",
2057 cmd->t_task_cdb[0], cmd->sam_task_attr,
2058 cmd->se_ordered_id);
2059 /*
2060 * Return zero to let transport_execute_tasks() know
2061 * not to add the delayed tasks to the execution list.
2062 */
2063 return 0;
2064 }
2065 /*
2066 * Otherwise, no ORDERED task attributes exist..
2067 */
2068 return 1;
2069 }
2070
2071 /*
2072 * Called from fabric module context in transport_generic_new_cmd() and
2073 * transport_generic_process_write()
2074 */
2075 static int transport_execute_tasks(struct se_cmd *cmd)
2076 {
2077 int add_tasks;
2078
2079 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2080 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2081 transport_generic_request_failure(cmd, 0, 1);
2082 return 0;
2083 }
2084
2085 /*
2086 * Call transport_cmd_check_stop() to see if a fabric exception
2087 * has occurred that prevents execution.
2088 */
2089 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2090 /*
2091 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2092 * attribute for the tasks of the received struct se_cmd CDB
2093 */
2094 add_tasks = transport_execute_task_attr(cmd);
2095 if (!add_tasks)
2096 goto execute_tasks;
2097 /*
2098 * This calls transport_add_tasks_from_cmd() to handle
2099 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2100 * (if enabled) in __transport_add_task_to_execute_queue() and
2101 * transport_add_task_check_sam_attr().
2102 */
2103 transport_add_tasks_from_cmd(cmd);
2104 }
2105 /*
2106 * Kick the execution queue for the cmd associated struct se_device
2107 * storage object.
2108 */
2109 execute_tasks:
2110 __transport_execute_tasks(cmd->se_dev);
2111 return 0;
2112 }
2113
2114 /*
2115 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2116 * from struct se_device->execute_task_list and
2117 *
2118 * Called from transport_processing_thread()
2119 */
2120 static int __transport_execute_tasks(struct se_device *dev)
2121 {
2122 int error;
2123 struct se_cmd *cmd = NULL;
2124 struct se_task *task = NULL;
2125 unsigned long flags;
2126
2127 /*
2128 * Check if there is enough room in the device and HBA queue to send
2129 * struct se_tasks to the selected transport.
2130 */
2131 check_depth:
2132 if (!atomic_read(&dev->depth_left))
2133 return transport_tcq_window_closed(dev);
2134
2135 dev->dev_tcq_window_closed = 0;
2136
2137 spin_lock_irq(&dev->execute_task_lock);
2138 if (list_empty(&dev->execute_task_list)) {
2139 spin_unlock_irq(&dev->execute_task_lock);
2140 return 0;
2141 }
2142 task = list_first_entry(&dev->execute_task_list,
2143 struct se_task, t_execute_list);
2144 __transport_remove_task_from_execute_queue(task, dev);
2145 spin_unlock_irq(&dev->execute_task_lock);
2146
2147 atomic_dec(&dev->depth_left);
2148
2149 cmd = task->task_se_cmd;
2150
2151 spin_lock_irqsave(&cmd->t_state_lock, flags);
2152 task->task_flags |= (TF_ACTIVE | TF_SENT);
2153 atomic_inc(&cmd->t_task_cdbs_sent);
2154
2155 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2156 cmd->t_task_list_num)
2157 atomic_set(&cmd->t_transport_sent, 1);
2158
2159 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2160
2161 if (cmd->execute_task)
2162 error = cmd->execute_task(task);
2163 else
2164 error = dev->transport->do_task(task);
2165 if (error != 0) {
2166 cmd->transport_error_status = error;
2167 spin_lock_irqsave(&cmd->t_state_lock, flags);
2168 task->task_flags &= ~TF_ACTIVE;
2169 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2170 atomic_set(&cmd->t_transport_sent, 0);
2171 transport_stop_tasks_for_cmd(cmd);
2172 atomic_inc(&dev->depth_left);
2173 transport_generic_request_failure(cmd, 0, 1);
2174 }
2175
2176 goto check_depth;
2177
2178 return 0;
2179 }
2180
2181 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2182 {
2183 unsigned long flags;
2184 /*
2185 * Any unsolicited data will get dumped for failed command inside of
2186 * the fabric plugin
2187 */
2188 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2189 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2190 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2191 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2192 }
2193
2194 static inline u32 transport_get_sectors_6(
2195 unsigned char *cdb,
2196 struct se_cmd *cmd,
2197 int *ret)
2198 {
2199 struct se_device *dev = cmd->se_dev;
2200
2201 /*
2202 * Assume TYPE_DISK for non struct se_device objects.
2203 * Use 8-bit sector value.
2204 */
2205 if (!dev)
2206 goto type_disk;
2207
2208 /*
2209 * Use 24-bit allocation length for TYPE_TAPE.
2210 */
2211 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2212 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2213
2214 /*
2215 * Everything else assume TYPE_DISK Sector CDB location.
2216 * Use 8-bit sector value.
2217 */
2218 type_disk:
2219 return (u32)cdb[4];
2220 }
2221
2222 static inline u32 transport_get_sectors_10(
2223 unsigned char *cdb,
2224 struct se_cmd *cmd,
2225 int *ret)
2226 {
2227 struct se_device *dev = cmd->se_dev;
2228
2229 /*
2230 * Assume TYPE_DISK for non struct se_device objects.
2231 * Use 16-bit sector value.
2232 */
2233 if (!dev)
2234 goto type_disk;
2235
2236 /*
2237 * XXX_10 is not defined in SSC, throw an exception
2238 */
2239 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2240 *ret = -EINVAL;
2241 return 0;
2242 }
2243
2244 /*
2245 * Everything else assume TYPE_DISK Sector CDB location.
2246 * Use 16-bit sector value.
2247 */
2248 type_disk:
2249 return (u32)(cdb[7] << 8) + cdb[8];
2250 }
2251
2252 static inline u32 transport_get_sectors_12(
2253 unsigned char *cdb,
2254 struct se_cmd *cmd,
2255 int *ret)
2256 {
2257 struct se_device *dev = cmd->se_dev;
2258
2259 /*
2260 * Assume TYPE_DISK for non struct se_device objects.
2261 * Use 32-bit sector value.
2262 */
2263 if (!dev)
2264 goto type_disk;
2265
2266 /*
2267 * XXX_12 is not defined in SSC, throw an exception
2268 */
2269 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2270 *ret = -EINVAL;
2271 return 0;
2272 }
2273
2274 /*
2275 * Everything else assume TYPE_DISK Sector CDB location.
2276 * Use 32-bit sector value.
2277 */
2278 type_disk:
2279 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2280 }
2281
2282 static inline u32 transport_get_sectors_16(
2283 unsigned char *cdb,
2284 struct se_cmd *cmd,
2285 int *ret)
2286 {
2287 struct se_device *dev = cmd->se_dev;
2288
2289 /*
2290 * Assume TYPE_DISK for non struct se_device objects.
2291 * Use 32-bit sector value.
2292 */
2293 if (!dev)
2294 goto type_disk;
2295
2296 /*
2297 * Use 24-bit allocation length for TYPE_TAPE.
2298 */
2299 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2300 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2301
2302 type_disk:
2303 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2304 (cdb[12] << 8) + cdb[13];
2305 }
2306
2307 /*
2308 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2309 */
2310 static inline u32 transport_get_sectors_32(
2311 unsigned char *cdb,
2312 struct se_cmd *cmd,
2313 int *ret)
2314 {
2315 /*
2316 * Assume TYPE_DISK for non struct se_device objects.
2317 * Use 32-bit sector value.
2318 */
2319 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2320 (cdb[30] << 8) + cdb[31];
2321
2322 }
2323
2324 static inline u32 transport_get_size(
2325 u32 sectors,
2326 unsigned char *cdb,
2327 struct se_cmd *cmd)
2328 {
2329 struct se_device *dev = cmd->se_dev;
2330
2331 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2332 if (cdb[1] & 1) { /* sectors */
2333 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2334 } else /* bytes */
2335 return sectors;
2336 }
2337 #if 0
2338 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2339 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2340 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2341 dev->transport->name);
2342 #endif
2343 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2344 }
2345
2346 static void transport_xor_callback(struct se_cmd *cmd)
2347 {
2348 unsigned char *buf, *addr;
2349 struct scatterlist *sg;
2350 unsigned int offset;
2351 int i;
2352 int count;
2353 /*
2354 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2355 *
2356 * 1) read the specified logical block(s);
2357 * 2) transfer logical blocks from the data-out buffer;
2358 * 3) XOR the logical blocks transferred from the data-out buffer with
2359 * the logical blocks read, storing the resulting XOR data in a buffer;
2360 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2361 * blocks transferred from the data-out buffer; and
2362 * 5) transfer the resulting XOR data to the data-in buffer.
2363 */
2364 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2365 if (!buf) {
2366 pr_err("Unable to allocate xor_callback buf\n");
2367 return;
2368 }
2369 /*
2370 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2371 * into the locally allocated *buf
2372 */
2373 sg_copy_to_buffer(cmd->t_data_sg,
2374 cmd->t_data_nents,
2375 buf,
2376 cmd->data_length);
2377
2378 /*
2379 * Now perform the XOR against the BIDI read memory located at
2380 * cmd->t_mem_bidi_list
2381 */
2382
2383 offset = 0;
2384 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2385 addr = kmap_atomic(sg_page(sg), KM_USER0);
2386 if (!addr)
2387 goto out;
2388
2389 for (i = 0; i < sg->length; i++)
2390 *(addr + sg->offset + i) ^= *(buf + offset + i);
2391
2392 offset += sg->length;
2393 kunmap_atomic(addr, KM_USER0);
2394 }
2395
2396 out:
2397 kfree(buf);
2398 }
2399
2400 /*
2401 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2402 */
2403 static int transport_get_sense_data(struct se_cmd *cmd)
2404 {
2405 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2406 struct se_device *dev = cmd->se_dev;
2407 struct se_task *task = NULL, *task_tmp;
2408 unsigned long flags;
2409 u32 offset = 0;
2410
2411 WARN_ON(!cmd->se_lun);
2412
2413 if (!dev)
2414 return 0;
2415
2416 spin_lock_irqsave(&cmd->t_state_lock, flags);
2417 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2418 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2419 return 0;
2420 }
2421
2422 list_for_each_entry_safe(task, task_tmp,
2423 &cmd->t_task_list, t_list) {
2424 if (!task->task_sense)
2425 continue;
2426
2427 if (!dev->transport->get_sense_buffer) {
2428 pr_err("dev->transport->get_sense_buffer"
2429 " is NULL\n");
2430 continue;
2431 }
2432
2433 sense_buffer = dev->transport->get_sense_buffer(task);
2434 if (!sense_buffer) {
2435 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2436 " sense buffer for task with sense\n",
2437 cmd->se_tfo->get_task_tag(cmd), task);
2438 continue;
2439 }
2440 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2441
2442 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2443 TRANSPORT_SENSE_BUFFER);
2444
2445 memcpy(&buffer[offset], sense_buffer,
2446 TRANSPORT_SENSE_BUFFER);
2447 cmd->scsi_status = task->task_scsi_status;
2448 /* Automatically padded */
2449 cmd->scsi_sense_length =
2450 (TRANSPORT_SENSE_BUFFER + offset);
2451
2452 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2453 " and sense\n",
2454 dev->se_hba->hba_id, dev->transport->name,
2455 cmd->scsi_status);
2456 return 0;
2457 }
2458 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2459
2460 return -1;
2461 }
2462
2463 static int
2464 transport_handle_reservation_conflict(struct se_cmd *cmd)
2465 {
2466 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2467 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2468 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2469 /*
2470 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2471 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2472 * CONFLICT STATUS.
2473 *
2474 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2475 */
2476 if (cmd->se_sess &&
2477 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2478 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2479 cmd->orig_fe_lun, 0x2C,
2480 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2481 return -EINVAL;
2482 }
2483
2484 static inline long long transport_dev_end_lba(struct se_device *dev)
2485 {
2486 return dev->transport->get_blocks(dev) + 1;
2487 }
2488
2489 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2490 {
2491 struct se_device *dev = cmd->se_dev;
2492 u32 sectors;
2493
2494 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2495 return 0;
2496
2497 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2498
2499 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2500 pr_err("LBA: %llu Sectors: %u exceeds"
2501 " transport_dev_end_lba(): %llu\n",
2502 cmd->t_task_lba, sectors,
2503 transport_dev_end_lba(dev));
2504 return -EINVAL;
2505 }
2506
2507 return 0;
2508 }
2509
2510 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2511 {
2512 /*
2513 * Determine if the received WRITE_SAME is used to for direct
2514 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2515 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2516 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2517 */
2518 int passthrough = (dev->transport->transport_type ==
2519 TRANSPORT_PLUGIN_PHBA_PDEV);
2520
2521 if (!passthrough) {
2522 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2523 pr_err("WRITE_SAME PBDATA and LBDATA"
2524 " bits not supported for Block Discard"
2525 " Emulation\n");
2526 return -ENOSYS;
2527 }
2528 /*
2529 * Currently for the emulated case we only accept
2530 * tpws with the UNMAP=1 bit set.
2531 */
2532 if (!(flags[0] & 0x08)) {
2533 pr_err("WRITE_SAME w/o UNMAP bit not"
2534 " supported for Block Discard Emulation\n");
2535 return -ENOSYS;
2536 }
2537 }
2538
2539 return 0;
2540 }
2541
2542 /* transport_generic_cmd_sequencer():
2543 *
2544 * Generic Command Sequencer that should work for most DAS transport
2545 * drivers.
2546 *
2547 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2548 * RX Thread.
2549 *
2550 * FIXME: Need to support other SCSI OPCODES where as well.
2551 */
2552 static int transport_generic_cmd_sequencer(
2553 struct se_cmd *cmd,
2554 unsigned char *cdb)
2555 {
2556 struct se_device *dev = cmd->se_dev;
2557 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2558 int ret = 0, sector_ret = 0, passthrough;
2559 u32 sectors = 0, size = 0, pr_reg_type = 0;
2560 u16 service_action;
2561 u8 alua_ascq = 0;
2562 /*
2563 * Check for an existing UNIT ATTENTION condition
2564 */
2565 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2566 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2567 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2568 return -EINVAL;
2569 }
2570 /*
2571 * Check status of Asymmetric Logical Unit Assignment port
2572 */
2573 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2574 if (ret != 0) {
2575 /*
2576 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2577 * The ALUA additional sense code qualifier (ASCQ) is determined
2578 * by the ALUA primary or secondary access state..
2579 */
2580 if (ret > 0) {
2581 #if 0
2582 pr_debug("[%s]: ALUA TG Port not available,"
2583 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2584 cmd->se_tfo->get_fabric_name(), alua_ascq);
2585 #endif
2586 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2587 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2588 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2589 return -EINVAL;
2590 }
2591 goto out_invalid_cdb_field;
2592 }
2593 /*
2594 * Check status for SPC-3 Persistent Reservations
2595 */
2596 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2597 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2598 cmd, cdb, pr_reg_type) != 0)
2599 return transport_handle_reservation_conflict(cmd);
2600 /*
2601 * This means the CDB is allowed for the SCSI Initiator port
2602 * when said port is *NOT* holding the legacy SPC-2 or
2603 * SPC-3 Persistent Reservation.
2604 */
2605 }
2606
2607 /*
2608 * If we operate in passthrough mode we skip most CDB emulation and
2609 * instead hand the commands down to the physical SCSI device.
2610 */
2611 passthrough =
2612 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2613
2614 switch (cdb[0]) {
2615 case READ_6:
2616 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2617 if (sector_ret)
2618 goto out_unsupported_cdb;
2619 size = transport_get_size(sectors, cdb, cmd);
2620 cmd->t_task_lba = transport_lba_21(cdb);
2621 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2622 break;
2623 case READ_10:
2624 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2625 if (sector_ret)
2626 goto out_unsupported_cdb;
2627 size = transport_get_size(sectors, cdb, cmd);
2628 cmd->t_task_lba = transport_lba_32(cdb);
2629 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2630 break;
2631 case READ_12:
2632 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2633 if (sector_ret)
2634 goto out_unsupported_cdb;
2635 size = transport_get_size(sectors, cdb, cmd);
2636 cmd->t_task_lba = transport_lba_32(cdb);
2637 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2638 break;
2639 case READ_16:
2640 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2641 if (sector_ret)
2642 goto out_unsupported_cdb;
2643 size = transport_get_size(sectors, cdb, cmd);
2644 cmd->t_task_lba = transport_lba_64(cdb);
2645 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2646 break;
2647 case WRITE_6:
2648 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2649 if (sector_ret)
2650 goto out_unsupported_cdb;
2651 size = transport_get_size(sectors, cdb, cmd);
2652 cmd->t_task_lba = transport_lba_21(cdb);
2653 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2654 break;
2655 case WRITE_10:
2656 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2657 if (sector_ret)
2658 goto out_unsupported_cdb;
2659 size = transport_get_size(sectors, cdb, cmd);
2660 cmd->t_task_lba = transport_lba_32(cdb);
2661 cmd->t_tasks_fua = (cdb[1] & 0x8);
2662 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2663 break;
2664 case WRITE_12:
2665 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2666 if (sector_ret)
2667 goto out_unsupported_cdb;
2668 size = transport_get_size(sectors, cdb, cmd);
2669 cmd->t_task_lba = transport_lba_32(cdb);
2670 cmd->t_tasks_fua = (cdb[1] & 0x8);
2671 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2672 break;
2673 case WRITE_16:
2674 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2675 if (sector_ret)
2676 goto out_unsupported_cdb;
2677 size = transport_get_size(sectors, cdb, cmd);
2678 cmd->t_task_lba = transport_lba_64(cdb);
2679 cmd->t_tasks_fua = (cdb[1] & 0x8);
2680 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2681 break;
2682 case XDWRITEREAD_10:
2683 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2684 !(cmd->t_tasks_bidi))
2685 goto out_invalid_cdb_field;
2686 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2687 if (sector_ret)
2688 goto out_unsupported_cdb;
2689 size = transport_get_size(sectors, cdb, cmd);
2690 cmd->t_task_lba = transport_lba_32(cdb);
2691 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2692
2693 /*
2694 * Do now allow BIDI commands for passthrough mode.
2695 */
2696 if (passthrough)
2697 goto out_unsupported_cdb;
2698
2699 /*
2700 * Setup BIDI XOR callback to be run after I/O completion.
2701 */
2702 cmd->transport_complete_callback = &transport_xor_callback;
2703 cmd->t_tasks_fua = (cdb[1] & 0x8);
2704 break;
2705 case VARIABLE_LENGTH_CMD:
2706 service_action = get_unaligned_be16(&cdb[8]);
2707 switch (service_action) {
2708 case XDWRITEREAD_32:
2709 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2710 if (sector_ret)
2711 goto out_unsupported_cdb;
2712 size = transport_get_size(sectors, cdb, cmd);
2713 /*
2714 * Use WRITE_32 and READ_32 opcodes for the emulated
2715 * XDWRITE_READ_32 logic.
2716 */
2717 cmd->t_task_lba = transport_lba_64_ext(cdb);
2718 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2719
2720 /*
2721 * Do now allow BIDI commands for passthrough mode.
2722 */
2723 if (passthrough)
2724 goto out_unsupported_cdb;
2725
2726 /*
2727 * Setup BIDI XOR callback to be run during after I/O
2728 * completion.
2729 */
2730 cmd->transport_complete_callback = &transport_xor_callback;
2731 cmd->t_tasks_fua = (cdb[10] & 0x8);
2732 break;
2733 case WRITE_SAME_32:
2734 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2735 if (sector_ret)
2736 goto out_unsupported_cdb;
2737
2738 if (sectors)
2739 size = transport_get_size(1, cdb, cmd);
2740 else {
2741 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2742 " supported\n");
2743 goto out_invalid_cdb_field;
2744 }
2745
2746 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2747 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2748
2749 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2750 goto out_invalid_cdb_field;
2751 if (!passthrough)
2752 cmd->execute_task = target_emulate_write_same;
2753 break;
2754 default:
2755 pr_err("VARIABLE_LENGTH_CMD service action"
2756 " 0x%04x not supported\n", service_action);
2757 goto out_unsupported_cdb;
2758 }
2759 break;
2760 case MAINTENANCE_IN:
2761 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2762 /* MAINTENANCE_IN from SCC-2 */
2763 /*
2764 * Check for emulated MI_REPORT_TARGET_PGS.
2765 */
2766 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2767 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2768 cmd->execute_task =
2769 target_emulate_report_target_port_groups;
2770 }
2771 size = (cdb[6] << 24) | (cdb[7] << 16) |
2772 (cdb[8] << 8) | cdb[9];
2773 } else {
2774 /* GPCMD_SEND_KEY from multi media commands */
2775 size = (cdb[8] << 8) + cdb[9];
2776 }
2777 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2778 break;
2779 case MODE_SELECT:
2780 size = cdb[4];
2781 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2782 break;
2783 case MODE_SELECT_10:
2784 size = (cdb[7] << 8) + cdb[8];
2785 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2786 break;
2787 case MODE_SENSE:
2788 size = cdb[4];
2789 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2790 if (!passthrough)
2791 cmd->execute_task = target_emulate_modesense;
2792 break;
2793 case MODE_SENSE_10:
2794 size = (cdb[7] << 8) + cdb[8];
2795 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2796 if (!passthrough)
2797 cmd->execute_task = target_emulate_modesense;
2798 break;
2799 case GPCMD_READ_BUFFER_CAPACITY:
2800 case GPCMD_SEND_OPC:
2801 case LOG_SELECT:
2802 case LOG_SENSE:
2803 size = (cdb[7] << 8) + cdb[8];
2804 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2805 break;
2806 case READ_BLOCK_LIMITS:
2807 size = READ_BLOCK_LEN;
2808 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2809 break;
2810 case GPCMD_GET_CONFIGURATION:
2811 case GPCMD_READ_FORMAT_CAPACITIES:
2812 case GPCMD_READ_DISC_INFO:
2813 case GPCMD_READ_TRACK_RZONE_INFO:
2814 size = (cdb[7] << 8) + cdb[8];
2815 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2816 break;
2817 case PERSISTENT_RESERVE_IN:
2818 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2819 cmd->execute_task = target_scsi3_emulate_pr_in;
2820 size = (cdb[7] << 8) + cdb[8];
2821 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2822 break;
2823 case PERSISTENT_RESERVE_OUT:
2824 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2825 cmd->execute_task = target_scsi3_emulate_pr_out;
2826 size = (cdb[7] << 8) + cdb[8];
2827 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2828 break;
2829 case GPCMD_MECHANISM_STATUS:
2830 case GPCMD_READ_DVD_STRUCTURE:
2831 size = (cdb[8] << 8) + cdb[9];
2832 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2833 break;
2834 case READ_POSITION:
2835 size = READ_POSITION_LEN;
2836 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2837 break;
2838 case MAINTENANCE_OUT:
2839 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2840 /* MAINTENANCE_OUT from SCC-2
2841 *
2842 * Check for emulated MO_SET_TARGET_PGS.
2843 */
2844 if (cdb[1] == MO_SET_TARGET_PGS &&
2845 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2846 cmd->execute_task =
2847 target_emulate_set_target_port_groups;
2848 }
2849
2850 size = (cdb[6] << 24) | (cdb[7] << 16) |
2851 (cdb[8] << 8) | cdb[9];
2852 } else {
2853 /* GPCMD_REPORT_KEY from multi media commands */
2854 size = (cdb[8] << 8) + cdb[9];
2855 }
2856 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2857 break;
2858 case INQUIRY:
2859 size = (cdb[3] << 8) + cdb[4];
2860 /*
2861 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2862 * See spc4r17 section 5.3
2863 */
2864 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2865 cmd->sam_task_attr = MSG_HEAD_TAG;
2866 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2867 if (!passthrough)
2868 cmd->execute_task = target_emulate_inquiry;
2869 break;
2870 case READ_BUFFER:
2871 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2872 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2873 break;
2874 case READ_CAPACITY:
2875 size = READ_CAP_LEN;
2876 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2877 if (!passthrough)
2878 cmd->execute_task = target_emulate_readcapacity;
2879 break;
2880 case READ_MEDIA_SERIAL_NUMBER:
2881 case SECURITY_PROTOCOL_IN:
2882 case SECURITY_PROTOCOL_OUT:
2883 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2884 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2885 break;
2886 case SERVICE_ACTION_IN:
2887 switch (cmd->t_task_cdb[1] & 0x1f) {
2888 case SAI_READ_CAPACITY_16:
2889 if (!passthrough)
2890 cmd->execute_task =
2891 target_emulate_readcapacity_16;
2892 break;
2893 default:
2894 if (passthrough)
2895 break;
2896
2897 pr_err("Unsupported SA: 0x%02x\n",
2898 cmd->t_task_cdb[1] & 0x1f);
2899 goto out_unsupported_cdb;
2900 }
2901 /*FALLTHROUGH*/
2902 case ACCESS_CONTROL_IN:
2903 case ACCESS_CONTROL_OUT:
2904 case EXTENDED_COPY:
2905 case READ_ATTRIBUTE:
2906 case RECEIVE_COPY_RESULTS:
2907 case WRITE_ATTRIBUTE:
2908 size = (cdb[10] << 24) | (cdb[11] << 16) |
2909 (cdb[12] << 8) | cdb[13];
2910 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2911 break;
2912 case RECEIVE_DIAGNOSTIC:
2913 case SEND_DIAGNOSTIC:
2914 size = (cdb[3] << 8) | cdb[4];
2915 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2916 break;
2917 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2918 #if 0
2919 case GPCMD_READ_CD:
2920 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2921 size = (2336 * sectors);
2922 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2923 break;
2924 #endif
2925 case READ_TOC:
2926 size = cdb[8];
2927 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2928 break;
2929 case REQUEST_SENSE:
2930 size = cdb[4];
2931 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2932 if (!passthrough)
2933 cmd->execute_task = target_emulate_request_sense;
2934 break;
2935 case READ_ELEMENT_STATUS:
2936 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2937 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2938 break;
2939 case WRITE_BUFFER:
2940 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2941 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2942 break;
2943 case RESERVE:
2944 case RESERVE_10:
2945 /*
2946 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2947 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2948 */
2949 if (cdb[0] == RESERVE_10)
2950 size = (cdb[7] << 8) | cdb[8];
2951 else
2952 size = cmd->data_length;
2953
2954 /*
2955 * Setup the legacy emulated handler for SPC-2 and
2956 * >= SPC-3 compatible reservation handling (CRH=1)
2957 * Otherwise, we assume the underlying SCSI logic is
2958 * is running in SPC_PASSTHROUGH, and wants reservations
2959 * emulation disabled.
2960 */
2961 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2962 cmd->execute_task = target_scsi2_reservation_reserve;
2963 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2964 break;
2965 case RELEASE:
2966 case RELEASE_10:
2967 /*
2968 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2969 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2970 */
2971 if (cdb[0] == RELEASE_10)
2972 size = (cdb[7] << 8) | cdb[8];
2973 else
2974 size = cmd->data_length;
2975
2976 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2977 cmd->execute_task = target_scsi2_reservation_release;
2978 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2979 break;
2980 case SYNCHRONIZE_CACHE:
2981 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2982 /*
2983 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2984 */
2985 if (cdb[0] == SYNCHRONIZE_CACHE) {
2986 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2987 cmd->t_task_lba = transport_lba_32(cdb);
2988 } else {
2989 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2990 cmd->t_task_lba = transport_lba_64(cdb);
2991 }
2992 if (sector_ret)
2993 goto out_unsupported_cdb;
2994
2995 size = transport_get_size(sectors, cdb, cmd);
2996 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2997
2998 if (passthrough)
2999 break;
3000
3001 /*
3002 * Check to ensure that LBA + Range does not exceed past end of
3003 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3004 */
3005 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3006 if (transport_cmd_get_valid_sectors(cmd) < 0)
3007 goto out_invalid_cdb_field;
3008 }
3009 cmd->execute_task = target_emulate_synchronize_cache;
3010 break;
3011 case UNMAP:
3012 size = get_unaligned_be16(&cdb[7]);
3013 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3014 if (!passthrough)
3015 cmd->execute_task = target_emulate_unmap;
3016 break;
3017 case WRITE_SAME_16:
3018 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3019 if (sector_ret)
3020 goto out_unsupported_cdb;
3021
3022 if (sectors)
3023 size = transport_get_size(1, cdb, cmd);
3024 else {
3025 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3026 goto out_invalid_cdb_field;
3027 }
3028
3029 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3030 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3031
3032 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3033 goto out_invalid_cdb_field;
3034 if (!passthrough)
3035 cmd->execute_task = target_emulate_write_same;
3036 break;
3037 case WRITE_SAME:
3038 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3039 if (sector_ret)
3040 goto out_unsupported_cdb;
3041
3042 if (sectors)
3043 size = transport_get_size(1, cdb, cmd);
3044 else {
3045 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3046 goto out_invalid_cdb_field;
3047 }
3048
3049 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3050 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3051 /*
3052 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3053 * of byte 1 bit 3 UNMAP instead of original reserved field
3054 */
3055 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3056 goto out_invalid_cdb_field;
3057 if (!passthrough)
3058 cmd->execute_task = target_emulate_write_same;
3059 break;
3060 case ALLOW_MEDIUM_REMOVAL:
3061 case ERASE:
3062 case REZERO_UNIT:
3063 case SEEK_10:
3064 case SPACE:
3065 case START_STOP:
3066 case TEST_UNIT_READY:
3067 case VERIFY:
3068 case WRITE_FILEMARKS:
3069 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3070 if (!passthrough)
3071 cmd->execute_task = target_emulate_noop;
3072 break;
3073 case GPCMD_CLOSE_TRACK:
3074 case INITIALIZE_ELEMENT_STATUS:
3075 case GPCMD_LOAD_UNLOAD:
3076 case GPCMD_SET_SPEED:
3077 case MOVE_MEDIUM:
3078 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3079 break;
3080 case REPORT_LUNS:
3081 cmd->execute_task = target_report_luns;
3082 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3083 /*
3084 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3085 * See spc4r17 section 5.3
3086 */
3087 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3088 cmd->sam_task_attr = MSG_HEAD_TAG;
3089 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3090 break;
3091 default:
3092 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3093 " 0x%02x, sending CHECK_CONDITION.\n",
3094 cmd->se_tfo->get_fabric_name(), cdb[0]);
3095 goto out_unsupported_cdb;
3096 }
3097
3098 if (size != cmd->data_length) {
3099 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3100 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3101 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3102 cmd->data_length, size, cdb[0]);
3103
3104 cmd->cmd_spdtl = size;
3105
3106 if (cmd->data_direction == DMA_TO_DEVICE) {
3107 pr_err("Rejecting underflow/overflow"
3108 " WRITE data\n");
3109 goto out_invalid_cdb_field;
3110 }
3111 /*
3112 * Reject READ_* or WRITE_* with overflow/underflow for
3113 * type SCF_SCSI_DATA_SG_IO_CDB.
3114 */
3115 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3116 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3117 " CDB on non 512-byte sector setup subsystem"
3118 " plugin: %s\n", dev->transport->name);
3119 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3120 goto out_invalid_cdb_field;
3121 }
3122
3123 if (size > cmd->data_length) {
3124 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3125 cmd->residual_count = (size - cmd->data_length);
3126 } else {
3127 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3128 cmd->residual_count = (cmd->data_length - size);
3129 }
3130 cmd->data_length = size;
3131 }
3132
3133 /* reject any command that we don't have a handler for */
3134 if (!(passthrough || cmd->execute_task ||
3135 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3136 goto out_unsupported_cdb;
3137
3138 /* Let's limit control cdbs to a page, for simplicity's sake. */
3139 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3140 size > PAGE_SIZE)
3141 goto out_invalid_cdb_field;
3142
3143 transport_set_supported_SAM_opcode(cmd);
3144 return ret;
3145
3146 out_unsupported_cdb:
3147 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3148 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3149 return -EINVAL;
3150 out_invalid_cdb_field:
3151 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3152 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3153 return -EINVAL;
3154 }
3155
3156 /*
3157 * Called from I/O completion to determine which dormant/delayed
3158 * and ordered cmds need to have their tasks added to the execution queue.
3159 */
3160 static void transport_complete_task_attr(struct se_cmd *cmd)
3161 {
3162 struct se_device *dev = cmd->se_dev;
3163 struct se_cmd *cmd_p, *cmd_tmp;
3164 int new_active_tasks = 0;
3165
3166 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3167 atomic_dec(&dev->simple_cmds);
3168 smp_mb__after_atomic_dec();
3169 dev->dev_cur_ordered_id++;
3170 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3171 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3172 cmd->se_ordered_id);
3173 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3174 atomic_dec(&dev->dev_hoq_count);
3175 smp_mb__after_atomic_dec();
3176 dev->dev_cur_ordered_id++;
3177 pr_debug("Incremented dev_cur_ordered_id: %u for"
3178 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3179 cmd->se_ordered_id);
3180 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3181 spin_lock(&dev->ordered_cmd_lock);
3182 list_del(&cmd->se_ordered_node);
3183 atomic_dec(&dev->dev_ordered_sync);
3184 smp_mb__after_atomic_dec();
3185 spin_unlock(&dev->ordered_cmd_lock);
3186
3187 dev->dev_cur_ordered_id++;
3188 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3189 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3190 }
3191 /*
3192 * Process all commands up to the last received
3193 * ORDERED task attribute which requires another blocking
3194 * boundary
3195 */
3196 spin_lock(&dev->delayed_cmd_lock);
3197 list_for_each_entry_safe(cmd_p, cmd_tmp,
3198 &dev->delayed_cmd_list, se_delayed_node) {
3199
3200 list_del(&cmd_p->se_delayed_node);
3201 spin_unlock(&dev->delayed_cmd_lock);
3202
3203 pr_debug("Calling add_tasks() for"
3204 " cmd_p: 0x%02x Task Attr: 0x%02x"
3205 " Dormant -> Active, se_ordered_id: %u\n",
3206 cmd_p->t_task_cdb[0],
3207 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3208
3209 transport_add_tasks_from_cmd(cmd_p);
3210 new_active_tasks++;
3211
3212 spin_lock(&dev->delayed_cmd_lock);
3213 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3214 break;
3215 }
3216 spin_unlock(&dev->delayed_cmd_lock);
3217 /*
3218 * If new tasks have become active, wake up the transport thread
3219 * to do the processing of the Active tasks.
3220 */
3221 if (new_active_tasks != 0)
3222 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3223 }
3224
3225 static void transport_complete_qf(struct se_cmd *cmd)
3226 {
3227 int ret = 0;
3228
3229 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3230 transport_complete_task_attr(cmd);
3231
3232 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3233 ret = cmd->se_tfo->queue_status(cmd);
3234 if (ret)
3235 goto out;
3236 }
3237
3238 switch (cmd->data_direction) {
3239 case DMA_FROM_DEVICE:
3240 ret = cmd->se_tfo->queue_data_in(cmd);
3241 break;
3242 case DMA_TO_DEVICE:
3243 if (cmd->t_bidi_data_sg) {
3244 ret = cmd->se_tfo->queue_data_in(cmd);
3245 if (ret < 0)
3246 break;
3247 }
3248 /* Fall through for DMA_TO_DEVICE */
3249 case DMA_NONE:
3250 ret = cmd->se_tfo->queue_status(cmd);
3251 break;
3252 default:
3253 break;
3254 }
3255
3256 out:
3257 if (ret < 0) {
3258 transport_handle_queue_full(cmd, cmd->se_dev);
3259 return;
3260 }
3261 transport_lun_remove_cmd(cmd);
3262 transport_cmd_check_stop_to_fabric(cmd);
3263 }
3264
3265 static void transport_handle_queue_full(
3266 struct se_cmd *cmd,
3267 struct se_device *dev)
3268 {
3269 spin_lock_irq(&dev->qf_cmd_lock);
3270 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3271 atomic_inc(&dev->dev_qf_count);
3272 smp_mb__after_atomic_inc();
3273 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3274
3275 schedule_work(&cmd->se_dev->qf_work_queue);
3276 }
3277
3278 static void target_complete_ok_work(struct work_struct *work)
3279 {
3280 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3281 int reason = 0, ret;
3282
3283 /*
3284 * Check if we need to move delayed/dormant tasks from cmds on the
3285 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3286 * Attribute.
3287 */
3288 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3289 transport_complete_task_attr(cmd);
3290 /*
3291 * Check to schedule QUEUE_FULL work, or execute an existing
3292 * cmd->transport_qf_callback()
3293 */
3294 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3295 schedule_work(&cmd->se_dev->qf_work_queue);
3296
3297 /*
3298 * Check if we need to retrieve a sense buffer from
3299 * the struct se_cmd in question.
3300 */
3301 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3302 if (transport_get_sense_data(cmd) < 0)
3303 reason = TCM_NON_EXISTENT_LUN;
3304
3305 /*
3306 * Only set when an struct se_task->task_scsi_status returned
3307 * a non GOOD status.
3308 */
3309 if (cmd->scsi_status) {
3310 ret = transport_send_check_condition_and_sense(
3311 cmd, reason, 1);
3312 if (ret == -EAGAIN || ret == -ENOMEM)
3313 goto queue_full;
3314
3315 transport_lun_remove_cmd(cmd);
3316 transport_cmd_check_stop_to_fabric(cmd);
3317 return;
3318 }
3319 }
3320 /*
3321 * Check for a callback, used by amongst other things
3322 * XDWRITE_READ_10 emulation.
3323 */
3324 if (cmd->transport_complete_callback)
3325 cmd->transport_complete_callback(cmd);
3326
3327 switch (cmd->data_direction) {
3328 case DMA_FROM_DEVICE:
3329 spin_lock(&cmd->se_lun->lun_sep_lock);
3330 if (cmd->se_lun->lun_sep) {
3331 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3332 cmd->data_length;
3333 }
3334 spin_unlock(&cmd->se_lun->lun_sep_lock);
3335
3336 ret = cmd->se_tfo->queue_data_in(cmd);
3337 if (ret == -EAGAIN || ret == -ENOMEM)
3338 goto queue_full;
3339 break;
3340 case DMA_TO_DEVICE:
3341 spin_lock(&cmd->se_lun->lun_sep_lock);
3342 if (cmd->se_lun->lun_sep) {
3343 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3344 cmd->data_length;
3345 }
3346 spin_unlock(&cmd->se_lun->lun_sep_lock);
3347 /*
3348 * Check if we need to send READ payload for BIDI-COMMAND
3349 */
3350 if (cmd->t_bidi_data_sg) {
3351 spin_lock(&cmd->se_lun->lun_sep_lock);
3352 if (cmd->se_lun->lun_sep) {
3353 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3354 cmd->data_length;
3355 }
3356 spin_unlock(&cmd->se_lun->lun_sep_lock);
3357 ret = cmd->se_tfo->queue_data_in(cmd);
3358 if (ret == -EAGAIN || ret == -ENOMEM)
3359 goto queue_full;
3360 break;
3361 }
3362 /* Fall through for DMA_TO_DEVICE */
3363 case DMA_NONE:
3364 ret = cmd->se_tfo->queue_status(cmd);
3365 if (ret == -EAGAIN || ret == -ENOMEM)
3366 goto queue_full;
3367 break;
3368 default:
3369 break;
3370 }
3371
3372 transport_lun_remove_cmd(cmd);
3373 transport_cmd_check_stop_to_fabric(cmd);
3374 return;
3375
3376 queue_full:
3377 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3378 " data_direction: %d\n", cmd, cmd->data_direction);
3379 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3380 transport_handle_queue_full(cmd, cmd->se_dev);
3381 }
3382
3383 static void transport_free_dev_tasks(struct se_cmd *cmd)
3384 {
3385 struct se_task *task, *task_tmp;
3386 unsigned long flags;
3387 LIST_HEAD(dispose_list);
3388
3389 spin_lock_irqsave(&cmd->t_state_lock, flags);
3390 list_for_each_entry_safe(task, task_tmp,
3391 &cmd->t_task_list, t_list) {
3392 if (!(task->task_flags & TF_ACTIVE))
3393 list_move_tail(&task->t_list, &dispose_list);
3394 }
3395 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3396
3397 while (!list_empty(&dispose_list)) {
3398 task = list_first_entry(&dispose_list, struct se_task, t_list);
3399
3400 if (task->task_sg != cmd->t_data_sg &&
3401 task->task_sg != cmd->t_bidi_data_sg)
3402 kfree(task->task_sg);
3403
3404 list_del(&task->t_list);
3405
3406 cmd->se_dev->transport->free_task(task);
3407 }
3408 }
3409
3410 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3411 {
3412 struct scatterlist *sg;
3413 int count;
3414
3415 for_each_sg(sgl, sg, nents, count)
3416 __free_page(sg_page(sg));
3417
3418 kfree(sgl);
3419 }
3420
3421 static inline void transport_free_pages(struct se_cmd *cmd)
3422 {
3423 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3424 return;
3425
3426 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3427 cmd->t_data_sg = NULL;
3428 cmd->t_data_nents = 0;
3429
3430 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3431 cmd->t_bidi_data_sg = NULL;
3432 cmd->t_bidi_data_nents = 0;
3433 }
3434
3435 /**
3436 * transport_put_cmd - release a reference to a command
3437 * @cmd: command to release
3438 *
3439 * This routine releases our reference to the command and frees it if possible.
3440 */
3441 static void transport_put_cmd(struct se_cmd *cmd)
3442 {
3443 unsigned long flags;
3444 int free_tasks = 0;
3445
3446 spin_lock_irqsave(&cmd->t_state_lock, flags);
3447 if (atomic_read(&cmd->t_fe_count)) {
3448 if (!atomic_dec_and_test(&cmd->t_fe_count))
3449 goto out_busy;
3450 }
3451
3452 if (atomic_read(&cmd->t_se_count)) {
3453 if (!atomic_dec_and_test(&cmd->t_se_count))
3454 goto out_busy;
3455 }
3456
3457 if (atomic_read(&cmd->transport_dev_active)) {
3458 atomic_set(&cmd->transport_dev_active, 0);
3459 transport_all_task_dev_remove_state(cmd);
3460 free_tasks = 1;
3461 }
3462 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3463
3464 if (free_tasks != 0)
3465 transport_free_dev_tasks(cmd);
3466
3467 transport_free_pages(cmd);
3468 transport_release_cmd(cmd);
3469 return;
3470 out_busy:
3471 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3472 }
3473
3474 /*
3475 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3476 * allocating in the core.
3477 * @cmd: Associated se_cmd descriptor
3478 * @mem: SGL style memory for TCM WRITE / READ
3479 * @sg_mem_num: Number of SGL elements
3480 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3481 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3482 *
3483 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3484 * of parameters.
3485 */
3486 int transport_generic_map_mem_to_cmd(
3487 struct se_cmd *cmd,
3488 struct scatterlist *sgl,
3489 u32 sgl_count,
3490 struct scatterlist *sgl_bidi,
3491 u32 sgl_bidi_count)
3492 {
3493 if (!sgl || !sgl_count)
3494 return 0;
3495
3496 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3497 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3498
3499 cmd->t_data_sg = sgl;
3500 cmd->t_data_nents = sgl_count;
3501
3502 if (sgl_bidi && sgl_bidi_count) {
3503 cmd->t_bidi_data_sg = sgl_bidi;
3504 cmd->t_bidi_data_nents = sgl_bidi_count;
3505 }
3506 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3507 }
3508
3509 return 0;
3510 }
3511 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3512
3513 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3514 {
3515 struct scatterlist *sg = cmd->t_data_sg;
3516
3517 BUG_ON(!sg);
3518 /*
3519 * We need to take into account a possible offset here for fabrics like
3520 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3521 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3522 */
3523 return kmap(sg_page(sg)) + sg->offset;
3524 }
3525 EXPORT_SYMBOL(transport_kmap_first_data_page);
3526
3527 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3528 {
3529 kunmap(sg_page(cmd->t_data_sg));
3530 }
3531 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3532
3533 static int
3534 transport_generic_get_mem(struct se_cmd *cmd)
3535 {
3536 u32 length = cmd->data_length;
3537 unsigned int nents;
3538 struct page *page;
3539 int i = 0;
3540
3541 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3542 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3543 if (!cmd->t_data_sg)
3544 return -ENOMEM;
3545
3546 cmd->t_data_nents = nents;
3547 sg_init_table(cmd->t_data_sg, nents);
3548
3549 while (length) {
3550 u32 page_len = min_t(u32, length, PAGE_SIZE);
3551 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3552 if (!page)
3553 goto out;
3554
3555 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3556 length -= page_len;
3557 i++;
3558 }
3559 return 0;
3560
3561 out:
3562 while (i >= 0) {
3563 __free_page(sg_page(&cmd->t_data_sg[i]));
3564 i--;
3565 }
3566 kfree(cmd->t_data_sg);
3567 cmd->t_data_sg = NULL;
3568 return -ENOMEM;
3569 }
3570
3571 /* Reduce sectors if they are too long for the device */
3572 static inline sector_t transport_limit_task_sectors(
3573 struct se_device *dev,
3574 unsigned long long lba,
3575 sector_t sectors)
3576 {
3577 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3578
3579 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3580 if ((lba + sectors) > transport_dev_end_lba(dev))
3581 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3582
3583 return sectors;
3584 }
3585
3586
3587 /*
3588 * This function can be used by HW target mode drivers to create a linked
3589 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3590 * This is intended to be called during the completion path by TCM Core
3591 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3592 */
3593 void transport_do_task_sg_chain(struct se_cmd *cmd)
3594 {
3595 struct scatterlist *sg_first = NULL;
3596 struct scatterlist *sg_prev = NULL;
3597 int sg_prev_nents = 0;
3598 struct scatterlist *sg;
3599 struct se_task *task;
3600 u32 chained_nents = 0;
3601 int i;
3602
3603 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3604
3605 /*
3606 * Walk the struct se_task list and setup scatterlist chains
3607 * for each contiguously allocated struct se_task->task_sg[].
3608 */
3609 list_for_each_entry(task, &cmd->t_task_list, t_list) {
3610 if (!task->task_sg)
3611 continue;
3612
3613 if (!sg_first) {
3614 sg_first = task->task_sg;
3615 chained_nents = task->task_sg_nents;
3616 } else {
3617 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3618 chained_nents += task->task_sg_nents;
3619 }
3620 /*
3621 * For the padded tasks, use the extra SGL vector allocated
3622 * in transport_allocate_data_tasks() for the sg_prev_nents
3623 * offset into sg_chain() above.
3624 *
3625 * We do not need the padding for the last task (or a single
3626 * task), but in that case we will never use the sg_prev_nents
3627 * value below which would be incorrect.
3628 */
3629 sg_prev_nents = (task->task_sg_nents + 1);
3630 sg_prev = task->task_sg;
3631 }
3632 /*
3633 * Setup the starting pointer and total t_tasks_sg_linked_no including
3634 * padding SGs for linking and to mark the end.
3635 */
3636 cmd->t_tasks_sg_chained = sg_first;
3637 cmd->t_tasks_sg_chained_no = chained_nents;
3638
3639 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3640 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3641 cmd->t_tasks_sg_chained_no);
3642
3643 for_each_sg(cmd->t_tasks_sg_chained, sg,
3644 cmd->t_tasks_sg_chained_no, i) {
3645
3646 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3647 i, sg, sg_page(sg), sg->length, sg->offset);
3648 if (sg_is_chain(sg))
3649 pr_debug("SG: %p sg_is_chain=1\n", sg);
3650 if (sg_is_last(sg))
3651 pr_debug("SG: %p sg_is_last=1\n", sg);
3652 }
3653 }
3654 EXPORT_SYMBOL(transport_do_task_sg_chain);
3655
3656 /*
3657 * Break up cmd into chunks transport can handle
3658 */
3659 static int
3660 transport_allocate_data_tasks(struct se_cmd *cmd,
3661 enum dma_data_direction data_direction,
3662 struct scatterlist *cmd_sg, unsigned int sgl_nents)
3663 {
3664 struct se_device *dev = cmd->se_dev;
3665 int task_count, i;
3666 unsigned long long lba;
3667 sector_t sectors, dev_max_sectors;
3668 u32 sector_size;
3669
3670 if (transport_cmd_get_valid_sectors(cmd) < 0)
3671 return -EINVAL;
3672
3673 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3674 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3675
3676 WARN_ON(cmd->data_length % sector_size);
3677
3678 lba = cmd->t_task_lba;
3679 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3680 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3681
3682 /*
3683 * If we need just a single task reuse the SG list in the command
3684 * and avoid a lot of work.
3685 */
3686 if (task_count == 1) {
3687 struct se_task *task;
3688 unsigned long flags;
3689
3690 task = transport_generic_get_task(cmd, data_direction);
3691 if (!task)
3692 return -ENOMEM;
3693
3694 task->task_sg = cmd_sg;
3695 task->task_sg_nents = sgl_nents;
3696
3697 task->task_lba = lba;
3698 task->task_sectors = sectors;
3699 task->task_size = task->task_sectors * sector_size;
3700
3701 spin_lock_irqsave(&cmd->t_state_lock, flags);
3702 list_add_tail(&task->t_list, &cmd->t_task_list);
3703 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3704
3705 return task_count;
3706 }
3707
3708 for (i = 0; i < task_count; i++) {
3709 struct se_task *task;
3710 unsigned int task_size, task_sg_nents_padded;
3711 struct scatterlist *sg;
3712 unsigned long flags;
3713 int count;
3714
3715 task = transport_generic_get_task(cmd, data_direction);
3716 if (!task)
3717 return -ENOMEM;
3718
3719 task->task_lba = lba;
3720 task->task_sectors = min(sectors, dev_max_sectors);
3721 task->task_size = task->task_sectors * sector_size;
3722
3723 /*
3724 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3725 * in order to calculate the number per task SGL entries
3726 */
3727 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3728 /*
3729 * Check if the fabric module driver is requesting that all
3730 * struct se_task->task_sg[] be chained together.. If so,
3731 * then allocate an extra padding SG entry for linking and
3732 * marking the end of the chained SGL for every task except
3733 * the last one for (task_count > 1) operation, or skipping
3734 * the extra padding for the (task_count == 1) case.
3735 */
3736 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3737 task_sg_nents_padded = (task->task_sg_nents + 1);
3738 } else
3739 task_sg_nents_padded = task->task_sg_nents;
3740
3741 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3742 task_sg_nents_padded, GFP_KERNEL);
3743 if (!task->task_sg) {
3744 cmd->se_dev->transport->free_task(task);
3745 return -ENOMEM;
3746 }
3747
3748 sg_init_table(task->task_sg, task_sg_nents_padded);
3749
3750 task_size = task->task_size;
3751
3752 /* Build new sgl, only up to task_size */
3753 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3754 if (cmd_sg->length > task_size)
3755 break;
3756
3757 *sg = *cmd_sg;
3758 task_size -= cmd_sg->length;
3759 cmd_sg = sg_next(cmd_sg);
3760 }
3761
3762 lba += task->task_sectors;
3763 sectors -= task->task_sectors;
3764
3765 spin_lock_irqsave(&cmd->t_state_lock, flags);
3766 list_add_tail(&task->t_list, &cmd->t_task_list);
3767 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3768 }
3769
3770 return task_count;
3771 }
3772
3773 static int
3774 transport_allocate_control_task(struct se_cmd *cmd)
3775 {
3776 struct se_task *task;
3777 unsigned long flags;
3778
3779 task = transport_generic_get_task(cmd, cmd->data_direction);
3780 if (!task)
3781 return -ENOMEM;
3782
3783 task->task_sg = cmd->t_data_sg;
3784 task->task_size = cmd->data_length;
3785 task->task_sg_nents = cmd->t_data_nents;
3786
3787 spin_lock_irqsave(&cmd->t_state_lock, flags);
3788 list_add_tail(&task->t_list, &cmd->t_task_list);
3789 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3790
3791 /* Success! Return number of tasks allocated */
3792 return 1;
3793 }
3794
3795 /*
3796 * Allocate any required ressources to execute the command, and either place
3797 * it on the execution queue if possible. For writes we might not have the
3798 * payload yet, thus notify the fabric via a call to ->write_pending instead.
3799 */
3800 int transport_generic_new_cmd(struct se_cmd *cmd)
3801 {
3802 struct se_device *dev = cmd->se_dev;
3803 int task_cdbs, task_cdbs_bidi = 0;
3804 int set_counts = 1;
3805 int ret = 0;
3806
3807 /*
3808 * Determine is the TCM fabric module has already allocated physical
3809 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3810 * beforehand.
3811 */
3812 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3813 cmd->data_length) {
3814 ret = transport_generic_get_mem(cmd);
3815 if (ret < 0)
3816 return ret;
3817 }
3818
3819 /*
3820 * For BIDI command set up the read tasks first.
3821 */
3822 if (cmd->t_bidi_data_sg &&
3823 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3824 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3825
3826 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3827 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3828 cmd->t_bidi_data_nents);
3829 if (task_cdbs_bidi <= 0)
3830 goto out_fail;
3831
3832 atomic_inc(&cmd->t_fe_count);
3833 atomic_inc(&cmd->t_se_count);
3834 set_counts = 0;
3835 }
3836
3837 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3838 task_cdbs = transport_allocate_data_tasks(cmd,
3839 cmd->data_direction, cmd->t_data_sg,
3840 cmd->t_data_nents);
3841 } else {
3842 task_cdbs = transport_allocate_control_task(cmd);
3843 }
3844
3845 if (task_cdbs <= 0)
3846 goto out_fail;
3847
3848 if (set_counts) {
3849 atomic_inc(&cmd->t_fe_count);
3850 atomic_inc(&cmd->t_se_count);
3851 }
3852
3853 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3854 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3855 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3856
3857 /*
3858 * For WRITEs, let the fabric know its buffer is ready..
3859 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3860 * will be added to the struct se_device execution queue after its WRITE
3861 * data has arrived. (ie: It gets handled by the transport processing
3862 * thread a second time)
3863 */
3864 if (cmd->data_direction == DMA_TO_DEVICE) {
3865 transport_add_tasks_to_state_queue(cmd);
3866 return transport_generic_write_pending(cmd);
3867 }
3868 /*
3869 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3870 * to the execution queue.
3871 */
3872 transport_execute_tasks(cmd);
3873 return 0;
3874
3875 out_fail:
3876 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3877 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3878 return -EINVAL;
3879 }
3880 EXPORT_SYMBOL(transport_generic_new_cmd);
3881
3882 /* transport_generic_process_write():
3883 *
3884 *
3885 */
3886 void transport_generic_process_write(struct se_cmd *cmd)
3887 {
3888 transport_execute_tasks(cmd);
3889 }
3890 EXPORT_SYMBOL(transport_generic_process_write);
3891
3892 static void transport_write_pending_qf(struct se_cmd *cmd)
3893 {
3894 int ret;
3895
3896 ret = cmd->se_tfo->write_pending(cmd);
3897 if (ret == -EAGAIN || ret == -ENOMEM) {
3898 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3899 cmd);
3900 transport_handle_queue_full(cmd, cmd->se_dev);
3901 }
3902 }
3903
3904 static int transport_generic_write_pending(struct se_cmd *cmd)
3905 {
3906 unsigned long flags;
3907 int ret;
3908
3909 spin_lock_irqsave(&cmd->t_state_lock, flags);
3910 cmd->t_state = TRANSPORT_WRITE_PENDING;
3911 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3912
3913 /*
3914 * Clear the se_cmd for WRITE_PENDING status in order to set
3915 * cmd->t_transport_active=0 so that transport_generic_handle_data
3916 * can be called from HW target mode interrupt code. This is safe
3917 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3918 * because the se_cmd->se_lun pointer is not being cleared.
3919 */
3920 transport_cmd_check_stop(cmd, 1, 0);
3921
3922 /*
3923 * Call the fabric write_pending function here to let the
3924 * frontend know that WRITE buffers are ready.
3925 */
3926 ret = cmd->se_tfo->write_pending(cmd);
3927 if (ret == -EAGAIN || ret == -ENOMEM)
3928 goto queue_full;
3929 else if (ret < 0)
3930 return ret;
3931
3932 return PYX_TRANSPORT_WRITE_PENDING;
3933
3934 queue_full:
3935 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3936 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3937 transport_handle_queue_full(cmd, cmd->se_dev);
3938 return 0;
3939 }
3940
3941 /**
3942 * transport_release_cmd - free a command
3943 * @cmd: command to free
3944 *
3945 * This routine unconditionally frees a command, and reference counting
3946 * or list removal must be done in the caller.
3947 */
3948 void transport_release_cmd(struct se_cmd *cmd)
3949 {
3950 BUG_ON(!cmd->se_tfo);
3951
3952 if (cmd->se_tmr_req)
3953 core_tmr_release_req(cmd->se_tmr_req);
3954 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3955 kfree(cmd->t_task_cdb);
3956 /*
3957 * Check if target_wait_for_sess_cmds() is expecting to
3958 * release se_cmd directly here..
3959 */
3960 if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3961 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3962 return;
3963
3964 cmd->se_tfo->release_cmd(cmd);
3965 }
3966 EXPORT_SYMBOL(transport_release_cmd);
3967
3968 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3969 {
3970 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3971 if (wait_for_tasks && cmd->se_tmr_req)
3972 transport_wait_for_tasks(cmd);
3973
3974 transport_release_cmd(cmd);
3975 } else {
3976 if (wait_for_tasks)
3977 transport_wait_for_tasks(cmd);
3978
3979 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3980
3981 if (cmd->se_lun)
3982 transport_lun_remove_cmd(cmd);
3983
3984 transport_free_dev_tasks(cmd);
3985
3986 transport_put_cmd(cmd);
3987 }
3988 }
3989 EXPORT_SYMBOL(transport_generic_free_cmd);
3990
3991 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3992 * @se_sess: session to reference
3993 * @se_cmd: command descriptor to add
3994 */
3995 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3996 {
3997 unsigned long flags;
3998
3999 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4000 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4001 se_cmd->check_release = 1;
4002 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4003 }
4004 EXPORT_SYMBOL(target_get_sess_cmd);
4005
4006 /* target_put_sess_cmd - Check for active I/O shutdown or list delete
4007 * @se_sess: session to reference
4008 * @se_cmd: command descriptor to drop
4009 */
4010 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4011 {
4012 unsigned long flags;
4013
4014 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4015 if (list_empty(&se_cmd->se_cmd_list)) {
4016 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4017 WARN_ON(1);
4018 return 0;
4019 }
4020
4021 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4022 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4023 complete(&se_cmd->cmd_wait_comp);
4024 return 1;
4025 }
4026 list_del(&se_cmd->se_cmd_list);
4027 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4028
4029 return 0;
4030 }
4031 EXPORT_SYMBOL(target_put_sess_cmd);
4032
4033 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4034 * @se_sess: session to split
4035 */
4036 void target_splice_sess_cmd_list(struct se_session *se_sess)
4037 {
4038 struct se_cmd *se_cmd;
4039 unsigned long flags;
4040
4041 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4042 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4043
4044 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4045 se_sess->sess_tearing_down = 1;
4046
4047 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4048
4049 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4050 se_cmd->cmd_wait_set = 1;
4051
4052 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4053 }
4054 EXPORT_SYMBOL(target_splice_sess_cmd_list);
4055
4056 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4057 * @se_sess: session to wait for active I/O
4058 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4059 */
4060 void target_wait_for_sess_cmds(
4061 struct se_session *se_sess,
4062 int wait_for_tasks)
4063 {
4064 struct se_cmd *se_cmd, *tmp_cmd;
4065 bool rc = false;
4066
4067 list_for_each_entry_safe(se_cmd, tmp_cmd,
4068 &se_sess->sess_wait_list, se_cmd_list) {
4069 list_del(&se_cmd->se_cmd_list);
4070
4071 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4072 " %d\n", se_cmd, se_cmd->t_state,
4073 se_cmd->se_tfo->get_cmd_state(se_cmd));
4074
4075 if (wait_for_tasks) {
4076 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4077 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4078 se_cmd->se_tfo->get_cmd_state(se_cmd));
4079
4080 rc = transport_wait_for_tasks(se_cmd);
4081
4082 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4083 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4084 se_cmd->se_tfo->get_cmd_state(se_cmd));
4085 }
4086
4087 if (!rc) {
4088 wait_for_completion(&se_cmd->cmd_wait_comp);
4089 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4090 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4091 se_cmd->se_tfo->get_cmd_state(se_cmd));
4092 }
4093
4094 se_cmd->se_tfo->release_cmd(se_cmd);
4095 }
4096 }
4097 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4098
4099 /* transport_lun_wait_for_tasks():
4100 *
4101 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4102 * an struct se_lun to be successfully shutdown.
4103 */
4104 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4105 {
4106 unsigned long flags;
4107 int ret;
4108 /*
4109 * If the frontend has already requested this struct se_cmd to
4110 * be stopped, we can safely ignore this struct se_cmd.
4111 */
4112 spin_lock_irqsave(&cmd->t_state_lock, flags);
4113 if (atomic_read(&cmd->t_transport_stop)) {
4114 atomic_set(&cmd->transport_lun_stop, 0);
4115 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4116 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4117 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4118 transport_cmd_check_stop(cmd, 1, 0);
4119 return -EPERM;
4120 }
4121 atomic_set(&cmd->transport_lun_fe_stop, 1);
4122 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4123
4124 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4125
4126 ret = transport_stop_tasks_for_cmd(cmd);
4127
4128 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4129 " %d\n", cmd, cmd->t_task_list_num, ret);
4130 if (!ret) {
4131 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4132 cmd->se_tfo->get_task_tag(cmd));
4133 wait_for_completion(&cmd->transport_lun_stop_comp);
4134 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4135 cmd->se_tfo->get_task_tag(cmd));
4136 }
4137 transport_remove_cmd_from_queue(cmd);
4138
4139 return 0;
4140 }
4141
4142 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4143 {
4144 struct se_cmd *cmd = NULL;
4145 unsigned long lun_flags, cmd_flags;
4146 /*
4147 * Do exception processing and return CHECK_CONDITION status to the
4148 * Initiator Port.
4149 */
4150 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4151 while (!list_empty(&lun->lun_cmd_list)) {
4152 cmd = list_first_entry(&lun->lun_cmd_list,
4153 struct se_cmd, se_lun_node);
4154 list_del(&cmd->se_lun_node);
4155
4156 atomic_set(&cmd->transport_lun_active, 0);
4157 /*
4158 * This will notify iscsi_target_transport.c:
4159 * transport_cmd_check_stop() that a LUN shutdown is in
4160 * progress for the iscsi_cmd_t.
4161 */
4162 spin_lock(&cmd->t_state_lock);
4163 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4164 "_lun_stop for ITT: 0x%08x\n",
4165 cmd->se_lun->unpacked_lun,
4166 cmd->se_tfo->get_task_tag(cmd));
4167 atomic_set(&cmd->transport_lun_stop, 1);
4168 spin_unlock(&cmd->t_state_lock);
4169
4170 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4171
4172 if (!cmd->se_lun) {
4173 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4174 cmd->se_tfo->get_task_tag(cmd),
4175 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4176 BUG();
4177 }
4178 /*
4179 * If the Storage engine still owns the iscsi_cmd_t, determine
4180 * and/or stop its context.
4181 */
4182 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4183 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4184 cmd->se_tfo->get_task_tag(cmd));
4185
4186 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4187 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4188 continue;
4189 }
4190
4191 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4192 "_wait_for_tasks(): SUCCESS\n",
4193 cmd->se_lun->unpacked_lun,
4194 cmd->se_tfo->get_task_tag(cmd));
4195
4196 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4197 if (!atomic_read(&cmd->transport_dev_active)) {
4198 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4199 goto check_cond;
4200 }
4201 atomic_set(&cmd->transport_dev_active, 0);
4202 transport_all_task_dev_remove_state(cmd);
4203 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4204
4205 transport_free_dev_tasks(cmd);
4206 /*
4207 * The Storage engine stopped this struct se_cmd before it was
4208 * send to the fabric frontend for delivery back to the
4209 * Initiator Node. Return this SCSI CDB back with an
4210 * CHECK_CONDITION status.
4211 */
4212 check_cond:
4213 transport_send_check_condition_and_sense(cmd,
4214 TCM_NON_EXISTENT_LUN, 0);
4215 /*
4216 * If the fabric frontend is waiting for this iscsi_cmd_t to
4217 * be released, notify the waiting thread now that LU has
4218 * finished accessing it.
4219 */
4220 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4221 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4222 pr_debug("SE_LUN[%d] - Detected FE stop for"
4223 " struct se_cmd: %p ITT: 0x%08x\n",
4224 lun->unpacked_lun,
4225 cmd, cmd->se_tfo->get_task_tag(cmd));
4226
4227 spin_unlock_irqrestore(&cmd->t_state_lock,
4228 cmd_flags);
4229 transport_cmd_check_stop(cmd, 1, 0);
4230 complete(&cmd->transport_lun_fe_stop_comp);
4231 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4232 continue;
4233 }
4234 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4235 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4236
4237 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4238 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4239 }
4240 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4241 }
4242
4243 static int transport_clear_lun_thread(void *p)
4244 {
4245 struct se_lun *lun = (struct se_lun *)p;
4246
4247 __transport_clear_lun_from_sessions(lun);
4248 complete(&lun->lun_shutdown_comp);
4249
4250 return 0;
4251 }
4252
4253 int transport_clear_lun_from_sessions(struct se_lun *lun)
4254 {
4255 struct task_struct *kt;
4256
4257 kt = kthread_run(transport_clear_lun_thread, lun,
4258 "tcm_cl_%u", lun->unpacked_lun);
4259 if (IS_ERR(kt)) {
4260 pr_err("Unable to start clear_lun thread\n");
4261 return PTR_ERR(kt);
4262 }
4263 wait_for_completion(&lun->lun_shutdown_comp);
4264
4265 return 0;
4266 }
4267
4268 /**
4269 * transport_wait_for_tasks - wait for completion to occur
4270 * @cmd: command to wait
4271 *
4272 * Called from frontend fabric context to wait for storage engine
4273 * to pause and/or release frontend generated struct se_cmd.
4274 */
4275 bool transport_wait_for_tasks(struct se_cmd *cmd)
4276 {
4277 unsigned long flags;
4278
4279 spin_lock_irqsave(&cmd->t_state_lock, flags);
4280 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4281 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4282 return false;
4283 }
4284 /*
4285 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4286 * has been set in transport_set_supported_SAM_opcode().
4287 */
4288 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4289 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4290 return false;
4291 }
4292 /*
4293 * If we are already stopped due to an external event (ie: LUN shutdown)
4294 * sleep until the connection can have the passed struct se_cmd back.
4295 * The cmd->transport_lun_stopped_sem will be upped by
4296 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4297 * has completed its operation on the struct se_cmd.
4298 */
4299 if (atomic_read(&cmd->transport_lun_stop)) {
4300
4301 pr_debug("wait_for_tasks: Stopping"
4302 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4303 "_stop_comp); for ITT: 0x%08x\n",
4304 cmd->se_tfo->get_task_tag(cmd));
4305 /*
4306 * There is a special case for WRITES where a FE exception +
4307 * LUN shutdown means ConfigFS context is still sleeping on
4308 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4309 * We go ahead and up transport_lun_stop_comp just to be sure
4310 * here.
4311 */
4312 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4313 complete(&cmd->transport_lun_stop_comp);
4314 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4315 spin_lock_irqsave(&cmd->t_state_lock, flags);
4316
4317 transport_all_task_dev_remove_state(cmd);
4318 /*
4319 * At this point, the frontend who was the originator of this
4320 * struct se_cmd, now owns the structure and can be released through
4321 * normal means below.
4322 */
4323 pr_debug("wait_for_tasks: Stopped"
4324 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4325 "stop_comp); for ITT: 0x%08x\n",
4326 cmd->se_tfo->get_task_tag(cmd));
4327
4328 atomic_set(&cmd->transport_lun_stop, 0);
4329 }
4330 if (!atomic_read(&cmd->t_transport_active) ||
4331 atomic_read(&cmd->t_transport_aborted)) {
4332 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4333 return false;
4334 }
4335
4336 atomic_set(&cmd->t_transport_stop, 1);
4337
4338 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4339 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4340 cmd, cmd->se_tfo->get_task_tag(cmd),
4341 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4342
4343 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4344
4345 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4346
4347 wait_for_completion(&cmd->t_transport_stop_comp);
4348
4349 spin_lock_irqsave(&cmd->t_state_lock, flags);
4350 atomic_set(&cmd->t_transport_active, 0);
4351 atomic_set(&cmd->t_transport_stop, 0);
4352
4353 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4354 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4355 cmd->se_tfo->get_task_tag(cmd));
4356
4357 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4358
4359 return true;
4360 }
4361 EXPORT_SYMBOL(transport_wait_for_tasks);
4362
4363 static int transport_get_sense_codes(
4364 struct se_cmd *cmd,
4365 u8 *asc,
4366 u8 *ascq)
4367 {
4368 *asc = cmd->scsi_asc;
4369 *ascq = cmd->scsi_ascq;
4370
4371 return 0;
4372 }
4373
4374 static int transport_set_sense_codes(
4375 struct se_cmd *cmd,
4376 u8 asc,
4377 u8 ascq)
4378 {
4379 cmd->scsi_asc = asc;
4380 cmd->scsi_ascq = ascq;
4381
4382 return 0;
4383 }
4384
4385 int transport_send_check_condition_and_sense(
4386 struct se_cmd *cmd,
4387 u8 reason,
4388 int from_transport)
4389 {
4390 unsigned char *buffer = cmd->sense_buffer;
4391 unsigned long flags;
4392 int offset;
4393 u8 asc = 0, ascq = 0;
4394
4395 spin_lock_irqsave(&cmd->t_state_lock, flags);
4396 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4397 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4398 return 0;
4399 }
4400 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4401 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4402
4403 if (!reason && from_transport)
4404 goto after_reason;
4405
4406 if (!from_transport)
4407 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4408 /*
4409 * Data Segment and SenseLength of the fabric response PDU.
4410 *
4411 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4412 * from include/scsi/scsi_cmnd.h
4413 */
4414 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4415 TRANSPORT_SENSE_BUFFER);
4416 /*
4417 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4418 * SENSE KEY values from include/scsi/scsi.h
4419 */
4420 switch (reason) {
4421 case TCM_NON_EXISTENT_LUN:
4422 /* CURRENT ERROR */
4423 buffer[offset] = 0x70;
4424 /* ILLEGAL REQUEST */
4425 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4426 /* LOGICAL UNIT NOT SUPPORTED */
4427 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4428 break;
4429 case TCM_UNSUPPORTED_SCSI_OPCODE:
4430 case TCM_SECTOR_COUNT_TOO_MANY:
4431 /* CURRENT ERROR */
4432 buffer[offset] = 0x70;
4433 /* ILLEGAL REQUEST */
4434 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4435 /* INVALID COMMAND OPERATION CODE */
4436 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4437 break;
4438 case TCM_UNKNOWN_MODE_PAGE:
4439 /* CURRENT ERROR */
4440 buffer[offset] = 0x70;
4441 /* ILLEGAL REQUEST */
4442 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4443 /* INVALID FIELD IN CDB */
4444 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4445 break;
4446 case TCM_CHECK_CONDITION_ABORT_CMD:
4447 /* CURRENT ERROR */
4448 buffer[offset] = 0x70;
4449 /* ABORTED COMMAND */
4450 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4451 /* BUS DEVICE RESET FUNCTION OCCURRED */
4452 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4453 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4454 break;
4455 case TCM_INCORRECT_AMOUNT_OF_DATA:
4456 /* CURRENT ERROR */
4457 buffer[offset] = 0x70;
4458 /* ABORTED COMMAND */
4459 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4460 /* WRITE ERROR */
4461 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4462 /* NOT ENOUGH UNSOLICITED DATA */
4463 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4464 break;
4465 case TCM_INVALID_CDB_FIELD:
4466 /* CURRENT ERROR */
4467 buffer[offset] = 0x70;
4468 /* ABORTED COMMAND */
4469 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4470 /* INVALID FIELD IN CDB */
4471 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4472 break;
4473 case TCM_INVALID_PARAMETER_LIST:
4474 /* CURRENT ERROR */
4475 buffer[offset] = 0x70;
4476 /* ABORTED COMMAND */
4477 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4478 /* INVALID FIELD IN PARAMETER LIST */
4479 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4480 break;
4481 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4482 /* CURRENT ERROR */
4483 buffer[offset] = 0x70;
4484 /* ABORTED COMMAND */
4485 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4486 /* WRITE ERROR */
4487 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4488 /* UNEXPECTED_UNSOLICITED_DATA */
4489 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4490 break;
4491 case TCM_SERVICE_CRC_ERROR:
4492 /* CURRENT ERROR */
4493 buffer[offset] = 0x70;
4494 /* ABORTED COMMAND */
4495 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4496 /* PROTOCOL SERVICE CRC ERROR */
4497 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4498 /* N/A */
4499 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4500 break;
4501 case TCM_SNACK_REJECTED:
4502 /* CURRENT ERROR */
4503 buffer[offset] = 0x70;
4504 /* ABORTED COMMAND */
4505 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4506 /* READ ERROR */
4507 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4508 /* FAILED RETRANSMISSION REQUEST */
4509 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4510 break;
4511 case TCM_WRITE_PROTECTED:
4512 /* CURRENT ERROR */
4513 buffer[offset] = 0x70;
4514 /* DATA PROTECT */
4515 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4516 /* WRITE PROTECTED */
4517 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4518 break;
4519 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4520 /* CURRENT ERROR */
4521 buffer[offset] = 0x70;
4522 /* UNIT ATTENTION */
4523 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4524 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4525 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4526 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4527 break;
4528 case TCM_CHECK_CONDITION_NOT_READY:
4529 /* CURRENT ERROR */
4530 buffer[offset] = 0x70;
4531 /* Not Ready */
4532 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4533 transport_get_sense_codes(cmd, &asc, &ascq);
4534 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4535 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4536 break;
4537 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4538 default:
4539 /* CURRENT ERROR */
4540 buffer[offset] = 0x70;
4541 /* ILLEGAL REQUEST */
4542 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4543 /* LOGICAL UNIT COMMUNICATION FAILURE */
4544 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4545 break;
4546 }
4547 /*
4548 * This code uses linux/include/scsi/scsi.h SAM status codes!
4549 */
4550 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4551 /*
4552 * Automatically padded, this value is encoded in the fabric's
4553 * data_length response PDU containing the SCSI defined sense data.
4554 */
4555 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4556
4557 after_reason:
4558 return cmd->se_tfo->queue_status(cmd);
4559 }
4560 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4561
4562 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4563 {
4564 int ret = 0;
4565
4566 if (atomic_read(&cmd->t_transport_aborted) != 0) {
4567 if (!send_status ||
4568 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4569 return 1;
4570 #if 0
4571 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4572 " status for CDB: 0x%02x ITT: 0x%08x\n",
4573 cmd->t_task_cdb[0],
4574 cmd->se_tfo->get_task_tag(cmd));
4575 #endif
4576 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4577 cmd->se_tfo->queue_status(cmd);
4578 ret = 1;
4579 }
4580 return ret;
4581 }
4582 EXPORT_SYMBOL(transport_check_aborted_status);
4583
4584 void transport_send_task_abort(struct se_cmd *cmd)
4585 {
4586 unsigned long flags;
4587
4588 spin_lock_irqsave(&cmd->t_state_lock, flags);
4589 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4590 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4591 return;
4592 }
4593 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4594
4595 /*
4596 * If there are still expected incoming fabric WRITEs, we wait
4597 * until until they have completed before sending a TASK_ABORTED
4598 * response. This response with TASK_ABORTED status will be
4599 * queued back to fabric module by transport_check_aborted_status().
4600 */
4601 if (cmd->data_direction == DMA_TO_DEVICE) {
4602 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4603 atomic_inc(&cmd->t_transport_aborted);
4604 smp_mb__after_atomic_inc();
4605 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4606 transport_new_cmd_failure(cmd);
4607 return;
4608 }
4609 }
4610 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4611 #if 0
4612 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4613 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4614 cmd->se_tfo->get_task_tag(cmd));
4615 #endif
4616 cmd->se_tfo->queue_status(cmd);
4617 }
4618
4619 /* transport_generic_do_tmr():
4620 *
4621 *
4622 */
4623 int transport_generic_do_tmr(struct se_cmd *cmd)
4624 {
4625 struct se_device *dev = cmd->se_dev;
4626 struct se_tmr_req *tmr = cmd->se_tmr_req;
4627 int ret;
4628
4629 switch (tmr->function) {
4630 case TMR_ABORT_TASK:
4631 tmr->response = TMR_FUNCTION_REJECTED;
4632 break;
4633 case TMR_ABORT_TASK_SET:
4634 case TMR_CLEAR_ACA:
4635 case TMR_CLEAR_TASK_SET:
4636 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4637 break;
4638 case TMR_LUN_RESET:
4639 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4640 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4641 TMR_FUNCTION_REJECTED;
4642 break;
4643 case TMR_TARGET_WARM_RESET:
4644 tmr->response = TMR_FUNCTION_REJECTED;
4645 break;
4646 case TMR_TARGET_COLD_RESET:
4647 tmr->response = TMR_FUNCTION_REJECTED;
4648 break;
4649 default:
4650 pr_err("Uknown TMR function: 0x%02x.\n",
4651 tmr->function);
4652 tmr->response = TMR_FUNCTION_REJECTED;
4653 break;
4654 }
4655
4656 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4657 cmd->se_tfo->queue_tm_rsp(cmd);
4658
4659 transport_cmd_check_stop_to_fabric(cmd);
4660 return 0;
4661 }
4662
4663 /* transport_processing_thread():
4664 *
4665 *
4666 */
4667 static int transport_processing_thread(void *param)
4668 {
4669 int ret;
4670 struct se_cmd *cmd;
4671 struct se_device *dev = (struct se_device *) param;
4672
4673 set_user_nice(current, -20);
4674
4675 while (!kthread_should_stop()) {
4676 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4677 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4678 kthread_should_stop());
4679 if (ret < 0)
4680 goto out;
4681
4682 get_cmd:
4683 __transport_execute_tasks(dev);
4684
4685 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4686 if (!cmd)
4687 continue;
4688
4689 switch (cmd->t_state) {
4690 case TRANSPORT_NEW_CMD:
4691 BUG();
4692 break;
4693 case TRANSPORT_NEW_CMD_MAP:
4694 if (!cmd->se_tfo->new_cmd_map) {
4695 pr_err("cmd->se_tfo->new_cmd_map is"
4696 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4697 BUG();
4698 }
4699 ret = cmd->se_tfo->new_cmd_map(cmd);
4700 if (ret < 0) {
4701 cmd->transport_error_status = ret;
4702 transport_generic_request_failure(cmd,
4703 0, (cmd->data_direction !=
4704 DMA_TO_DEVICE));
4705 break;
4706 }
4707 ret = transport_generic_new_cmd(cmd);
4708 if (ret < 0) {
4709 cmd->transport_error_status = ret;
4710 transport_generic_request_failure(cmd,
4711 0, (cmd->data_direction !=
4712 DMA_TO_DEVICE));
4713 }
4714 break;
4715 case TRANSPORT_PROCESS_WRITE:
4716 transport_generic_process_write(cmd);
4717 break;
4718 case TRANSPORT_PROCESS_TMR:
4719 transport_generic_do_tmr(cmd);
4720 break;
4721 case TRANSPORT_COMPLETE_QF_WP:
4722 transport_write_pending_qf(cmd);
4723 break;
4724 case TRANSPORT_COMPLETE_QF_OK:
4725 transport_complete_qf(cmd);
4726 break;
4727 default:
4728 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4729 "i_state: %d on SE LUN: %u\n",
4730 cmd->t_state,
4731 cmd->se_tfo->get_task_tag(cmd),
4732 cmd->se_tfo->get_cmd_state(cmd),
4733 cmd->se_lun->unpacked_lun);
4734 BUG();
4735 }
4736
4737 goto get_cmd;
4738 }
4739
4740 out:
4741 WARN_ON(!list_empty(&dev->state_task_list));
4742 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4743 dev->process_thread = NULL;
4744 return 0;
4745 }