target: Remove __transport_execute_tasks() for each processing context
[linux-2.6.git] / drivers / target / target_core_transport.c
1 /*******************************************************************************
2  * Filename:  target_core_transport.c
3  *
4  * This file contains the Generic Target Engine Core.
5  *
6  * 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_backend.h>
49 #include <target/target_core_fabric.h>
50 #include <target/target_core_configfs.h>
51
52 #include "target_core_internal.h"
53 #include "target_core_alua.h"
54 #include "target_core_pr.h"
55 #include "target_core_ua.h"
56
57 static int sub_api_initialized;
58
59 static struct workqueue_struct *target_completion_wq;
60 static struct kmem_cache *se_sess_cache;
61 struct kmem_cache *se_tmr_req_cache;
62 struct kmem_cache *se_ua_cache;
63 struct kmem_cache *t10_pr_reg_cache;
64 struct kmem_cache *t10_alua_lu_gp_cache;
65 struct kmem_cache *t10_alua_lu_gp_mem_cache;
66 struct kmem_cache *t10_alua_tg_pt_gp_cache;
67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
69 static int transport_generic_write_pending(struct se_cmd *);
70 static int transport_processing_thread(void *param);
71 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
72 static void transport_complete_task_attr(struct se_cmd *cmd);
73 static void transport_handle_queue_full(struct se_cmd *cmd,
74                 struct se_device *dev);
75 static void transport_free_dev_tasks(struct se_cmd *cmd);
76 static int transport_generic_get_mem(struct se_cmd *cmd);
77 static void transport_put_cmd(struct se_cmd *cmd);
78 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
79 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
80 static void transport_generic_request_failure(struct se_cmd *);
81 static void target_complete_ok_work(struct work_struct *work);
82
83 int init_se_kmem_caches(void)
84 {
85         se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
86                         sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
87                         0, NULL);
88         if (!se_tmr_req_cache) {
89                 pr_err("kmem_cache_create() for struct se_tmr_req"
90                                 " failed\n");
91                 goto out;
92         }
93         se_sess_cache = kmem_cache_create("se_sess_cache",
94                         sizeof(struct se_session), __alignof__(struct se_session),
95                         0, NULL);
96         if (!se_sess_cache) {
97                 pr_err("kmem_cache_create() for struct se_session"
98                                 " failed\n");
99                 goto out_free_tmr_req_cache;
100         }
101         se_ua_cache = kmem_cache_create("se_ua_cache",
102                         sizeof(struct se_ua), __alignof__(struct se_ua),
103                         0, NULL);
104         if (!se_ua_cache) {
105                 pr_err("kmem_cache_create() for struct se_ua failed\n");
106                 goto out_free_sess_cache;
107         }
108         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
109                         sizeof(struct t10_pr_registration),
110                         __alignof__(struct t10_pr_registration), 0, NULL);
111         if (!t10_pr_reg_cache) {
112                 pr_err("kmem_cache_create() for struct t10_pr_registration"
113                                 " failed\n");
114                 goto out_free_ua_cache;
115         }
116         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
117                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
118                         0, NULL);
119         if (!t10_alua_lu_gp_cache) {
120                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
121                                 " failed\n");
122                 goto out_free_pr_reg_cache;
123         }
124         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
125                         sizeof(struct t10_alua_lu_gp_member),
126                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
127         if (!t10_alua_lu_gp_mem_cache) {
128                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
129                                 "cache failed\n");
130                 goto out_free_lu_gp_cache;
131         }
132         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
133                         sizeof(struct t10_alua_tg_pt_gp),
134                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
135         if (!t10_alua_tg_pt_gp_cache) {
136                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
137                                 "cache failed\n");
138                 goto out_free_lu_gp_mem_cache;
139         }
140         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
141                         "t10_alua_tg_pt_gp_mem_cache",
142                         sizeof(struct t10_alua_tg_pt_gp_member),
143                         __alignof__(struct t10_alua_tg_pt_gp_member),
144                         0, NULL);
145         if (!t10_alua_tg_pt_gp_mem_cache) {
146                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
147                                 "mem_t failed\n");
148                 goto out_free_tg_pt_gp_cache;
149         }
150
151         target_completion_wq = alloc_workqueue("target_completion",
152                                                WQ_MEM_RECLAIM, 0);
153         if (!target_completion_wq)
154                 goto out_free_tg_pt_gp_mem_cache;
155
156         return 0;
157
158 out_free_tg_pt_gp_mem_cache:
159         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
160 out_free_tg_pt_gp_cache:
161         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
162 out_free_lu_gp_mem_cache:
163         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
164 out_free_lu_gp_cache:
165         kmem_cache_destroy(t10_alua_lu_gp_cache);
166 out_free_pr_reg_cache:
167         kmem_cache_destroy(t10_pr_reg_cache);
168 out_free_ua_cache:
169         kmem_cache_destroy(se_ua_cache);
170 out_free_sess_cache:
171         kmem_cache_destroy(se_sess_cache);
172 out_free_tmr_req_cache:
173         kmem_cache_destroy(se_tmr_req_cache);
174 out:
175         return -ENOMEM;
176 }
177
178 void release_se_kmem_caches(void)
179 {
180         destroy_workqueue(target_completion_wq);
181         kmem_cache_destroy(se_tmr_req_cache);
182         kmem_cache_destroy(se_sess_cache);
183         kmem_cache_destroy(se_ua_cache);
184         kmem_cache_destroy(t10_pr_reg_cache);
185         kmem_cache_destroy(t10_alua_lu_gp_cache);
186         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
187         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
188         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
189 }
190
191 /* This code ensures unique mib indexes are handed out. */
192 static DEFINE_SPINLOCK(scsi_mib_index_lock);
193 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
194
195 /*
196  * Allocate a new row index for the entry type specified
197  */
198 u32 scsi_get_new_index(scsi_index_t type)
199 {
200         u32 new_index;
201
202         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
203
204         spin_lock(&scsi_mib_index_lock);
205         new_index = ++scsi_mib_index[type];
206         spin_unlock(&scsi_mib_index_lock);
207
208         return new_index;
209 }
210
211 static void transport_init_queue_obj(struct se_queue_obj *qobj)
212 {
213         atomic_set(&qobj->queue_cnt, 0);
214         INIT_LIST_HEAD(&qobj->qobj_list);
215         init_waitqueue_head(&qobj->thread_wq);
216         spin_lock_init(&qobj->cmd_queue_lock);
217 }
218
219 void transport_subsystem_check_init(void)
220 {
221         int ret;
222
223         if (sub_api_initialized)
224                 return;
225
226         ret = request_module("target_core_iblock");
227         if (ret != 0)
228                 pr_err("Unable to load target_core_iblock\n");
229
230         ret = request_module("target_core_file");
231         if (ret != 0)
232                 pr_err("Unable to load target_core_file\n");
233
234         ret = request_module("target_core_pscsi");
235         if (ret != 0)
236                 pr_err("Unable to load target_core_pscsi\n");
237
238         ret = request_module("target_core_stgt");
239         if (ret != 0)
240                 pr_err("Unable to load target_core_stgt\n");
241
242         sub_api_initialized = 1;
243         return;
244 }
245
246 struct se_session *transport_init_session(void)
247 {
248         struct se_session *se_sess;
249
250         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
251         if (!se_sess) {
252                 pr_err("Unable to allocate struct se_session from"
253                                 " se_sess_cache\n");
254                 return ERR_PTR(-ENOMEM);
255         }
256         INIT_LIST_HEAD(&se_sess->sess_list);
257         INIT_LIST_HEAD(&se_sess->sess_acl_list);
258         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
259         INIT_LIST_HEAD(&se_sess->sess_wait_list);
260         spin_lock_init(&se_sess->sess_cmd_lock);
261
262         return se_sess;
263 }
264 EXPORT_SYMBOL(transport_init_session);
265
266 /*
267  * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
268  */
269 void __transport_register_session(
270         struct se_portal_group *se_tpg,
271         struct se_node_acl *se_nacl,
272         struct se_session *se_sess,
273         void *fabric_sess_ptr)
274 {
275         unsigned char buf[PR_REG_ISID_LEN];
276
277         se_sess->se_tpg = se_tpg;
278         se_sess->fabric_sess_ptr = fabric_sess_ptr;
279         /*
280          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
281          *
282          * Only set for struct se_session's that will actually be moving I/O.
283          * eg: *NOT* discovery sessions.
284          */
285         if (se_nacl) {
286                 /*
287                  * If the fabric module supports an ISID based TransportID,
288                  * save this value in binary from the fabric I_T Nexus now.
289                  */
290                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
291                         memset(&buf[0], 0, PR_REG_ISID_LEN);
292                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
293                                         &buf[0], PR_REG_ISID_LEN);
294                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
295                 }
296                 spin_lock_irq(&se_nacl->nacl_sess_lock);
297                 /*
298                  * The se_nacl->nacl_sess pointer will be set to the
299                  * last active I_T Nexus for each struct se_node_acl.
300                  */
301                 se_nacl->nacl_sess = se_sess;
302
303                 list_add_tail(&se_sess->sess_acl_list,
304                               &se_nacl->acl_sess_list);
305                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
306         }
307         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
308
309         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
310                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
311 }
312 EXPORT_SYMBOL(__transport_register_session);
313
314 void transport_register_session(
315         struct se_portal_group *se_tpg,
316         struct se_node_acl *se_nacl,
317         struct se_session *se_sess,
318         void *fabric_sess_ptr)
319 {
320         spin_lock_bh(&se_tpg->session_lock);
321         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
322         spin_unlock_bh(&se_tpg->session_lock);
323 }
324 EXPORT_SYMBOL(transport_register_session);
325
326 void transport_deregister_session_configfs(struct se_session *se_sess)
327 {
328         struct se_node_acl *se_nacl;
329         unsigned long flags;
330         /*
331          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
332          */
333         se_nacl = se_sess->se_node_acl;
334         if (se_nacl) {
335                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
336                 list_del(&se_sess->sess_acl_list);
337                 /*
338                  * If the session list is empty, then clear the pointer.
339                  * Otherwise, set the struct se_session pointer from the tail
340                  * element of the per struct se_node_acl active session list.
341                  */
342                 if (list_empty(&se_nacl->acl_sess_list))
343                         se_nacl->nacl_sess = NULL;
344                 else {
345                         se_nacl->nacl_sess = container_of(
346                                         se_nacl->acl_sess_list.prev,
347                                         struct se_session, sess_acl_list);
348                 }
349                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
350         }
351 }
352 EXPORT_SYMBOL(transport_deregister_session_configfs);
353
354 void transport_free_session(struct se_session *se_sess)
355 {
356         kmem_cache_free(se_sess_cache, se_sess);
357 }
358 EXPORT_SYMBOL(transport_free_session);
359
360 void transport_deregister_session(struct se_session *se_sess)
361 {
362         struct se_portal_group *se_tpg = se_sess->se_tpg;
363         struct se_node_acl *se_nacl;
364         unsigned long flags;
365
366         if (!se_tpg) {
367                 transport_free_session(se_sess);
368                 return;
369         }
370
371         spin_lock_irqsave(&se_tpg->session_lock, flags);
372         list_del(&se_sess->sess_list);
373         se_sess->se_tpg = NULL;
374         se_sess->fabric_sess_ptr = NULL;
375         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
376
377         /*
378          * Determine if we need to do extra work for this initiator node's
379          * struct se_node_acl if it had been previously dynamically generated.
380          */
381         se_nacl = se_sess->se_node_acl;
382         if (se_nacl) {
383                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
384                 if (se_nacl->dynamic_node_acl) {
385                         if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
386                                         se_tpg)) {
387                                 list_del(&se_nacl->acl_list);
388                                 se_tpg->num_node_acls--;
389                                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
390
391                                 core_tpg_wait_for_nacl_pr_ref(se_nacl);
392                                 core_free_device_list_for_node(se_nacl, se_tpg);
393                                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
394                                                 se_nacl);
395                                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
396                         }
397                 }
398                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
399         }
400
401         transport_free_session(se_sess);
402
403         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
404                 se_tpg->se_tpg_tfo->get_fabric_name());
405 }
406 EXPORT_SYMBOL(transport_deregister_session);
407
408 /*
409  * Called with cmd->t_state_lock held.
410  */
411 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
412 {
413         struct se_device *dev = cmd->se_dev;
414         struct se_task *task;
415         unsigned long flags;
416
417         if (!dev)
418                 return;
419
420         list_for_each_entry(task, &cmd->t_task_list, t_list) {
421                 if (task->task_flags & TF_ACTIVE)
422                         continue;
423
424                 spin_lock_irqsave(&dev->execute_task_lock, flags);
425                 if (task->t_state_active) {
426                         pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
427                                 cmd->se_tfo->get_task_tag(cmd), dev, task);
428
429                         list_del(&task->t_state_list);
430                         atomic_dec(&cmd->t_task_cdbs_ex_left);
431                         task->t_state_active = false;
432                 }
433                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
434         }
435
436 }
437
438 /*      transport_cmd_check_stop():
439  *
440  *      'transport_off = 1' determines if t_transport_active should be cleared.
441  *      'transport_off = 2' determines if task_dev_state should be removed.
442  *
443  *      A non-zero u8 t_state sets cmd->t_state.
444  *      Returns 1 when command is stopped, else 0.
445  */
446 static int transport_cmd_check_stop(
447         struct se_cmd *cmd,
448         int transport_off,
449         u8 t_state)
450 {
451         unsigned long flags;
452
453         spin_lock_irqsave(&cmd->t_state_lock, flags);
454         /*
455          * Determine if IOCTL context caller in requesting the stopping of this
456          * command for LUN shutdown purposes.
457          */
458         if (atomic_read(&cmd->transport_lun_stop)) {
459                 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
460                         " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
461                         cmd->se_tfo->get_task_tag(cmd));
462
463                 atomic_set(&cmd->t_transport_active, 0);
464                 if (transport_off == 2)
465                         transport_all_task_dev_remove_state(cmd);
466                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
467
468                 complete(&cmd->transport_lun_stop_comp);
469                 return 1;
470         }
471         /*
472          * Determine if frontend context caller is requesting the stopping of
473          * this command for frontend exceptions.
474          */
475         if (atomic_read(&cmd->t_transport_stop)) {
476                 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
477                         " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
478                         cmd->se_tfo->get_task_tag(cmd));
479
480                 if (transport_off == 2)
481                         transport_all_task_dev_remove_state(cmd);
482
483                 /*
484                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
485                  * to FE.
486                  */
487                 if (transport_off == 2)
488                         cmd->se_lun = NULL;
489                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
490
491                 complete(&cmd->t_transport_stop_comp);
492                 return 1;
493         }
494         if (transport_off) {
495                 atomic_set(&cmd->t_transport_active, 0);
496                 if (transport_off == 2) {
497                         transport_all_task_dev_remove_state(cmd);
498                         /*
499                          * Clear struct se_cmd->se_lun before the transport_off == 2
500                          * handoff to fabric module.
501                          */
502                         cmd->se_lun = NULL;
503                         /*
504                          * Some fabric modules like tcm_loop can release
505                          * their internally allocated I/O reference now and
506                          * struct se_cmd now.
507                          *
508                          * Fabric modules are expected to return '1' here if the
509                          * se_cmd being passed is released at this point,
510                          * or zero if not being released.
511                          */
512                         if (cmd->se_tfo->check_stop_free != NULL) {
513                                 spin_unlock_irqrestore(
514                                         &cmd->t_state_lock, flags);
515
516                                 return cmd->se_tfo->check_stop_free(cmd);
517                         }
518                 }
519                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
520
521                 return 0;
522         } else if (t_state)
523                 cmd->t_state = t_state;
524         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
525
526         return 0;
527 }
528
529 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
530 {
531         return transport_cmd_check_stop(cmd, 2, 0);
532 }
533
534 static void transport_lun_remove_cmd(struct se_cmd *cmd)
535 {
536         struct se_lun *lun = cmd->se_lun;
537         unsigned long flags;
538
539         if (!lun)
540                 return;
541
542         spin_lock_irqsave(&cmd->t_state_lock, flags);
543         if (!atomic_read(&cmd->transport_dev_active)) {
544                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
545                 goto check_lun;
546         }
547         atomic_set(&cmd->transport_dev_active, 0);
548         transport_all_task_dev_remove_state(cmd);
549         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
550
551
552 check_lun:
553         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
554         if (atomic_read(&cmd->transport_lun_active)) {
555                 list_del(&cmd->se_lun_node);
556                 atomic_set(&cmd->transport_lun_active, 0);
557 #if 0
558                 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
559                         cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
560 #endif
561         }
562         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
563 }
564
565 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
566 {
567         if (!cmd->se_tmr_req)
568                 transport_lun_remove_cmd(cmd);
569
570         if (transport_cmd_check_stop_to_fabric(cmd))
571                 return;
572         if (remove) {
573                 transport_remove_cmd_from_queue(cmd);
574                 transport_put_cmd(cmd);
575         }
576 }
577
578 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
579                 bool at_head)
580 {
581         struct se_device *dev = cmd->se_dev;
582         struct se_queue_obj *qobj = &dev->dev_queue_obj;
583         unsigned long flags;
584
585         if (t_state) {
586                 spin_lock_irqsave(&cmd->t_state_lock, flags);
587                 cmd->t_state = t_state;
588                 atomic_set(&cmd->t_transport_active, 1);
589                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
590         }
591
592         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
593
594         /* If the cmd is already on the list, remove it before we add it */
595         if (!list_empty(&cmd->se_queue_node))
596                 list_del(&cmd->se_queue_node);
597         else
598                 atomic_inc(&qobj->queue_cnt);
599
600         if (at_head)
601                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
602         else
603                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
604         atomic_set(&cmd->t_transport_queue_active, 1);
605         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
606
607         wake_up_interruptible(&qobj->thread_wq);
608 }
609
610 static struct se_cmd *
611 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
612 {
613         struct se_cmd *cmd;
614         unsigned long flags;
615
616         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
617         if (list_empty(&qobj->qobj_list)) {
618                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
619                 return NULL;
620         }
621         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
622
623         atomic_set(&cmd->t_transport_queue_active, 0);
624
625         list_del_init(&cmd->se_queue_node);
626         atomic_dec(&qobj->queue_cnt);
627         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
628
629         return cmd;
630 }
631
632 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
633 {
634         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
635         unsigned long flags;
636
637         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
638         if (!atomic_read(&cmd->t_transport_queue_active)) {
639                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640                 return;
641         }
642         atomic_set(&cmd->t_transport_queue_active, 0);
643         atomic_dec(&qobj->queue_cnt);
644         list_del_init(&cmd->se_queue_node);
645         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646
647         if (atomic_read(&cmd->t_transport_queue_active)) {
648                 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
649                         cmd->se_tfo->get_task_tag(cmd),
650                         atomic_read(&cmd->t_transport_queue_active));
651         }
652 }
653
654 /*
655  * Completion function used by TCM subsystem plugins (such as FILEIO)
656  * for queueing up response from struct se_subsystem_api->do_task()
657  */
658 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
659 {
660         struct se_task *task = list_entry(cmd->t_task_list.next,
661                                 struct se_task, t_list);
662
663         if (good) {
664                 cmd->scsi_status = SAM_STAT_GOOD;
665                 task->task_scsi_status = GOOD;
666         } else {
667                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
668                 task->task_se_cmd->scsi_sense_reason =
669                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
670
671         }
672
673         transport_complete_task(task, good);
674 }
675 EXPORT_SYMBOL(transport_complete_sync_cache);
676
677 static void target_complete_failure_work(struct work_struct *work)
678 {
679         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
680
681         transport_generic_request_failure(cmd);
682 }
683
684 /*      transport_complete_task():
685  *
686  *      Called from interrupt and non interrupt context depending
687  *      on the transport plugin.
688  */
689 void transport_complete_task(struct se_task *task, int success)
690 {
691         struct se_cmd *cmd = task->task_se_cmd;
692         struct se_device *dev = cmd->se_dev;
693         unsigned long flags;
694
695         spin_lock_irqsave(&cmd->t_state_lock, flags);
696         task->task_flags &= ~TF_ACTIVE;
697
698         /*
699          * See if any sense data exists, if so set the TASK_SENSE flag.
700          * Also check for any other post completion work that needs to be
701          * done by the plugins.
702          */
703         if (dev && dev->transport->transport_complete) {
704                 if (dev->transport->transport_complete(task) != 0) {
705                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
706                         task->task_flags |= TF_HAS_SENSE;
707                         success = 1;
708                 }
709         }
710
711         /*
712          * See if we are waiting for outstanding struct se_task
713          * to complete for an exception condition
714          */
715         if (task->task_flags & TF_REQUEST_STOP) {
716                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
717                 complete(&task->task_stop_comp);
718                 return;
719         }
720
721         if (!success)
722                 cmd->t_tasks_failed = 1;
723
724         /*
725          * Decrement the outstanding t_task_cdbs_left count.  The last
726          * struct se_task from struct se_cmd will complete itself into the
727          * device queue depending upon int success.
728          */
729         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
730                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
731                 return;
732         }
733
734         if (cmd->t_tasks_failed) {
735                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
736                 INIT_WORK(&cmd->work, target_complete_failure_work);
737         } else {
738                 atomic_set(&cmd->t_transport_complete, 1);
739                 INIT_WORK(&cmd->work, target_complete_ok_work);
740         }
741
742         cmd->t_state = TRANSPORT_COMPLETE;
743         atomic_set(&cmd->t_transport_active, 1);
744         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
745
746         queue_work(target_completion_wq, &cmd->work);
747 }
748 EXPORT_SYMBOL(transport_complete_task);
749
750 /*
751  * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
752  * struct se_task list are ready to be added to the active execution list
753  * struct se_device
754
755  * Called with se_dev_t->execute_task_lock called.
756  */
757 static inline int transport_add_task_check_sam_attr(
758         struct se_task *task,
759         struct se_task *task_prev,
760         struct se_device *dev)
761 {
762         /*
763          * No SAM Task attribute emulation enabled, add to tail of
764          * execution queue
765          */
766         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
767                 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
768                 return 0;
769         }
770         /*
771          * HEAD_OF_QUEUE attribute for received CDB, which means
772          * the first task that is associated with a struct se_cmd goes to
773          * head of the struct se_device->execute_task_list, and task_prev
774          * after that for each subsequent task
775          */
776         if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
777                 list_add(&task->t_execute_list,
778                                 (task_prev != NULL) ?
779                                 &task_prev->t_execute_list :
780                                 &dev->execute_task_list);
781
782                 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
783                                 " in execution queue\n",
784                                 task->task_se_cmd->t_task_cdb[0]);
785                 return 1;
786         }
787         /*
788          * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
789          * transitioned from Dermant -> Active state, and are added to the end
790          * of the struct se_device->execute_task_list
791          */
792         list_add_tail(&task->t_execute_list, &dev->execute_task_list);
793         return 0;
794 }
795
796 /*      __transport_add_task_to_execute_queue():
797  *
798  *      Called with se_dev_t->execute_task_lock called.
799  */
800 static void __transport_add_task_to_execute_queue(
801         struct se_task *task,
802         struct se_task *task_prev,
803         struct se_device *dev)
804 {
805         int head_of_queue;
806
807         head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
808         atomic_inc(&dev->execute_tasks);
809
810         if (task->t_state_active)
811                 return;
812         /*
813          * Determine if this task needs to go to HEAD_OF_QUEUE for the
814          * state list as well.  Running with SAM Task Attribute emulation
815          * will always return head_of_queue == 0 here
816          */
817         if (head_of_queue)
818                 list_add(&task->t_state_list, (task_prev) ?
819                                 &task_prev->t_state_list :
820                                 &dev->state_task_list);
821         else
822                 list_add_tail(&task->t_state_list, &dev->state_task_list);
823
824         task->t_state_active = true;
825
826         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
827                 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
828                 task, dev);
829 }
830
831 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
832 {
833         struct se_device *dev = cmd->se_dev;
834         struct se_task *task;
835         unsigned long flags;
836
837         spin_lock_irqsave(&cmd->t_state_lock, flags);
838         list_for_each_entry(task, &cmd->t_task_list, t_list) {
839                 spin_lock(&dev->execute_task_lock);
840                 if (!task->t_state_active) {
841                         list_add_tail(&task->t_state_list,
842                                       &dev->state_task_list);
843                         task->t_state_active = true;
844
845                         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
846                                 task->task_se_cmd->se_tfo->get_task_tag(
847                                 task->task_se_cmd), task, dev);
848                 }
849                 spin_unlock(&dev->execute_task_lock);
850         }
851         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
852 }
853
854 static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
855 {
856         struct se_device *dev = cmd->se_dev;
857         struct se_task *task, *task_prev = NULL;
858
859         list_for_each_entry(task, &cmd->t_task_list, t_list) {
860                 if (!list_empty(&task->t_execute_list))
861                         continue;
862                 /*
863                  * __transport_add_task_to_execute_queue() handles the
864                  * SAM Task Attribute emulation if enabled
865                  */
866                 __transport_add_task_to_execute_queue(task, task_prev, dev);
867                 task_prev = task;
868         }
869 }
870
871 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
872 {
873         unsigned long flags;
874         struct se_device *dev = cmd->se_dev;
875
876         spin_lock_irqsave(&dev->execute_task_lock, flags);
877         __transport_add_tasks_from_cmd(cmd);
878         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
879 }
880
881 void __transport_remove_task_from_execute_queue(struct se_task *task,
882                 struct se_device *dev)
883 {
884         list_del_init(&task->t_execute_list);
885         atomic_dec(&dev->execute_tasks);
886 }
887
888 static void transport_remove_task_from_execute_queue(
889         struct se_task *task,
890         struct se_device *dev)
891 {
892         unsigned long flags;
893
894         if (WARN_ON(list_empty(&task->t_execute_list)))
895                 return;
896
897         spin_lock_irqsave(&dev->execute_task_lock, flags);
898         __transport_remove_task_from_execute_queue(task, dev);
899         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
900 }
901
902 /*
903  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
904  */
905
906 static void target_qf_do_work(struct work_struct *work)
907 {
908         struct se_device *dev = container_of(work, struct se_device,
909                                         qf_work_queue);
910         LIST_HEAD(qf_cmd_list);
911         struct se_cmd *cmd, *cmd_tmp;
912
913         spin_lock_irq(&dev->qf_cmd_lock);
914         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
915         spin_unlock_irq(&dev->qf_cmd_lock);
916
917         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
918                 list_del(&cmd->se_qf_node);
919                 atomic_dec(&dev->dev_qf_count);
920                 smp_mb__after_atomic_dec();
921
922                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
923                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
924                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
925                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
926                         : "UNKNOWN");
927
928                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
929         }
930 }
931
932 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
933 {
934         switch (cmd->data_direction) {
935         case DMA_NONE:
936                 return "NONE";
937         case DMA_FROM_DEVICE:
938                 return "READ";
939         case DMA_TO_DEVICE:
940                 return "WRITE";
941         case DMA_BIDIRECTIONAL:
942                 return "BIDI";
943         default:
944                 break;
945         }
946
947         return "UNKNOWN";
948 }
949
950 void transport_dump_dev_state(
951         struct se_device *dev,
952         char *b,
953         int *bl)
954 {
955         *bl += sprintf(b + *bl, "Status: ");
956         switch (dev->dev_status) {
957         case TRANSPORT_DEVICE_ACTIVATED:
958                 *bl += sprintf(b + *bl, "ACTIVATED");
959                 break;
960         case TRANSPORT_DEVICE_DEACTIVATED:
961                 *bl += sprintf(b + *bl, "DEACTIVATED");
962                 break;
963         case TRANSPORT_DEVICE_SHUTDOWN:
964                 *bl += sprintf(b + *bl, "SHUTDOWN");
965                 break;
966         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
967         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
968                 *bl += sprintf(b + *bl, "OFFLINE");
969                 break;
970         default:
971                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
972                 break;
973         }
974
975         *bl += sprintf(b + *bl, "  Execute/Max Queue Depth: %d/%d",
976                 atomic_read(&dev->execute_tasks), dev->queue_depth);
977         *bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
978                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
979         *bl += sprintf(b + *bl, "        ");
980 }
981
982 void transport_dump_vpd_proto_id(
983         struct t10_vpd *vpd,
984         unsigned char *p_buf,
985         int p_buf_len)
986 {
987         unsigned char buf[VPD_TMP_BUF_SIZE];
988         int len;
989
990         memset(buf, 0, VPD_TMP_BUF_SIZE);
991         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
992
993         switch (vpd->protocol_identifier) {
994         case 0x00:
995                 sprintf(buf+len, "Fibre Channel\n");
996                 break;
997         case 0x10:
998                 sprintf(buf+len, "Parallel SCSI\n");
999                 break;
1000         case 0x20:
1001                 sprintf(buf+len, "SSA\n");
1002                 break;
1003         case 0x30:
1004                 sprintf(buf+len, "IEEE 1394\n");
1005                 break;
1006         case 0x40:
1007                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1008                                 " Protocol\n");
1009                 break;
1010         case 0x50:
1011                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1012                 break;
1013         case 0x60:
1014                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1015                 break;
1016         case 0x70:
1017                 sprintf(buf+len, "Automation/Drive Interface Transport"
1018                                 " Protocol\n");
1019                 break;
1020         case 0x80:
1021                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1022                 break;
1023         default:
1024                 sprintf(buf+len, "Unknown 0x%02x\n",
1025                                 vpd->protocol_identifier);
1026                 break;
1027         }
1028
1029         if (p_buf)
1030                 strncpy(p_buf, buf, p_buf_len);
1031         else
1032                 pr_debug("%s", buf);
1033 }
1034
1035 void
1036 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1037 {
1038         /*
1039          * Check if the Protocol Identifier Valid (PIV) bit is set..
1040          *
1041          * from spc3r23.pdf section 7.5.1
1042          */
1043          if (page_83[1] & 0x80) {
1044                 vpd->protocol_identifier = (page_83[0] & 0xf0);
1045                 vpd->protocol_identifier_set = 1;
1046                 transport_dump_vpd_proto_id(vpd, NULL, 0);
1047         }
1048 }
1049 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1050
1051 int transport_dump_vpd_assoc(
1052         struct t10_vpd *vpd,
1053         unsigned char *p_buf,
1054         int p_buf_len)
1055 {
1056         unsigned char buf[VPD_TMP_BUF_SIZE];
1057         int ret = 0;
1058         int len;
1059
1060         memset(buf, 0, VPD_TMP_BUF_SIZE);
1061         len = sprintf(buf, "T10 VPD Identifier Association: ");
1062
1063         switch (vpd->association) {
1064         case 0x00:
1065                 sprintf(buf+len, "addressed logical unit\n");
1066                 break;
1067         case 0x10:
1068                 sprintf(buf+len, "target port\n");
1069                 break;
1070         case 0x20:
1071                 sprintf(buf+len, "SCSI target device\n");
1072                 break;
1073         default:
1074                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1075                 ret = -EINVAL;
1076                 break;
1077         }
1078
1079         if (p_buf)
1080                 strncpy(p_buf, buf, p_buf_len);
1081         else
1082                 pr_debug("%s", buf);
1083
1084         return ret;
1085 }
1086
1087 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1088 {
1089         /*
1090          * The VPD identification association..
1091          *
1092          * from spc3r23.pdf Section 7.6.3.1 Table 297
1093          */
1094         vpd->association = (page_83[1] & 0x30);
1095         return transport_dump_vpd_assoc(vpd, NULL, 0);
1096 }
1097 EXPORT_SYMBOL(transport_set_vpd_assoc);
1098
1099 int transport_dump_vpd_ident_type(
1100         struct t10_vpd *vpd,
1101         unsigned char *p_buf,
1102         int p_buf_len)
1103 {
1104         unsigned char buf[VPD_TMP_BUF_SIZE];
1105         int ret = 0;
1106         int len;
1107
1108         memset(buf, 0, VPD_TMP_BUF_SIZE);
1109         len = sprintf(buf, "T10 VPD Identifier Type: ");
1110
1111         switch (vpd->device_identifier_type) {
1112         case 0x00:
1113                 sprintf(buf+len, "Vendor specific\n");
1114                 break;
1115         case 0x01:
1116                 sprintf(buf+len, "T10 Vendor ID based\n");
1117                 break;
1118         case 0x02:
1119                 sprintf(buf+len, "EUI-64 based\n");
1120                 break;
1121         case 0x03:
1122                 sprintf(buf+len, "NAA\n");
1123                 break;
1124         case 0x04:
1125                 sprintf(buf+len, "Relative target port identifier\n");
1126                 break;
1127         case 0x08:
1128                 sprintf(buf+len, "SCSI name string\n");
1129                 break;
1130         default:
1131                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1132                                 vpd->device_identifier_type);
1133                 ret = -EINVAL;
1134                 break;
1135         }
1136
1137         if (p_buf) {
1138                 if (p_buf_len < strlen(buf)+1)
1139                         return -EINVAL;
1140                 strncpy(p_buf, buf, p_buf_len);
1141         } else {
1142                 pr_debug("%s", buf);
1143         }
1144
1145         return ret;
1146 }
1147
1148 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1149 {
1150         /*
1151          * The VPD identifier type..
1152          *
1153          * from spc3r23.pdf Section 7.6.3.1 Table 298
1154          */
1155         vpd->device_identifier_type = (page_83[1] & 0x0f);
1156         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1157 }
1158 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1159
1160 int transport_dump_vpd_ident(
1161         struct t10_vpd *vpd,
1162         unsigned char *p_buf,
1163         int p_buf_len)
1164 {
1165         unsigned char buf[VPD_TMP_BUF_SIZE];
1166         int ret = 0;
1167
1168         memset(buf, 0, VPD_TMP_BUF_SIZE);
1169
1170         switch (vpd->device_identifier_code_set) {
1171         case 0x01: /* Binary */
1172                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1173                         &vpd->device_identifier[0]);
1174                 break;
1175         case 0x02: /* ASCII */
1176                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1177                         &vpd->device_identifier[0]);
1178                 break;
1179         case 0x03: /* UTF-8 */
1180                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1181                         &vpd->device_identifier[0]);
1182                 break;
1183         default:
1184                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1185                         " 0x%02x", vpd->device_identifier_code_set);
1186                 ret = -EINVAL;
1187                 break;
1188         }
1189
1190         if (p_buf)
1191                 strncpy(p_buf, buf, p_buf_len);
1192         else
1193                 pr_debug("%s", buf);
1194
1195         return ret;
1196 }
1197
1198 int
1199 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1200 {
1201         static const char hex_str[] = "0123456789abcdef";
1202         int j = 0, i = 4; /* offset to start of the identifer */
1203
1204         /*
1205          * The VPD Code Set (encoding)
1206          *
1207          * from spc3r23.pdf Section 7.6.3.1 Table 296
1208          */
1209         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1210         switch (vpd->device_identifier_code_set) {
1211         case 0x01: /* Binary */
1212                 vpd->device_identifier[j++] =
1213                                 hex_str[vpd->device_identifier_type];
1214                 while (i < (4 + page_83[3])) {
1215                         vpd->device_identifier[j++] =
1216                                 hex_str[(page_83[i] & 0xf0) >> 4];
1217                         vpd->device_identifier[j++] =
1218                                 hex_str[page_83[i] & 0x0f];
1219                         i++;
1220                 }
1221                 break;
1222         case 0x02: /* ASCII */
1223         case 0x03: /* UTF-8 */
1224                 while (i < (4 + page_83[3]))
1225                         vpd->device_identifier[j++] = page_83[i++];
1226                 break;
1227         default:
1228                 break;
1229         }
1230
1231         return transport_dump_vpd_ident(vpd, NULL, 0);
1232 }
1233 EXPORT_SYMBOL(transport_set_vpd_ident);
1234
1235 static void core_setup_task_attr_emulation(struct se_device *dev)
1236 {
1237         /*
1238          * If this device is from Target_Core_Mod/pSCSI, disable the
1239          * SAM Task Attribute emulation.
1240          *
1241          * This is currently not available in upsream Linux/SCSI Target
1242          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1243          */
1244         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1245                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1246                 return;
1247         }
1248
1249         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1250         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1251                 " device\n", dev->transport->name,
1252                 dev->transport->get_device_rev(dev));
1253 }
1254
1255 static void scsi_dump_inquiry(struct se_device *dev)
1256 {
1257         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1258         int i, device_type;
1259         /*
1260          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1261          */
1262         pr_debug("  Vendor: ");
1263         for (i = 0; i < 8; i++)
1264                 if (wwn->vendor[i] >= 0x20)
1265                         pr_debug("%c", wwn->vendor[i]);
1266                 else
1267                         pr_debug(" ");
1268
1269         pr_debug("  Model: ");
1270         for (i = 0; i < 16; i++)
1271                 if (wwn->model[i] >= 0x20)
1272                         pr_debug("%c", wwn->model[i]);
1273                 else
1274                         pr_debug(" ");
1275
1276         pr_debug("  Revision: ");
1277         for (i = 0; i < 4; i++)
1278                 if (wwn->revision[i] >= 0x20)
1279                         pr_debug("%c", wwn->revision[i]);
1280                 else
1281                         pr_debug(" ");
1282
1283         pr_debug("\n");
1284
1285         device_type = dev->transport->get_device_type(dev);
1286         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1287         pr_debug("                 ANSI SCSI revision: %02x\n",
1288                                 dev->transport->get_device_rev(dev));
1289 }
1290
1291 struct se_device *transport_add_device_to_core_hba(
1292         struct se_hba *hba,
1293         struct se_subsystem_api *transport,
1294         struct se_subsystem_dev *se_dev,
1295         u32 device_flags,
1296         void *transport_dev,
1297         struct se_dev_limits *dev_limits,
1298         const char *inquiry_prod,
1299         const char *inquiry_rev)
1300 {
1301         int force_pt;
1302         struct se_device  *dev;
1303
1304         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1305         if (!dev) {
1306                 pr_err("Unable to allocate memory for se_dev_t\n");
1307                 return NULL;
1308         }
1309
1310         transport_init_queue_obj(&dev->dev_queue_obj);
1311         dev->dev_flags          = device_flags;
1312         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1313         dev->dev_ptr            = transport_dev;
1314         dev->se_hba             = hba;
1315         dev->se_sub_dev         = se_dev;
1316         dev->transport          = transport;
1317         INIT_LIST_HEAD(&dev->dev_list);
1318         INIT_LIST_HEAD(&dev->dev_sep_list);
1319         INIT_LIST_HEAD(&dev->dev_tmr_list);
1320         INIT_LIST_HEAD(&dev->execute_task_list);
1321         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1322         INIT_LIST_HEAD(&dev->state_task_list);
1323         INIT_LIST_HEAD(&dev->qf_cmd_list);
1324         spin_lock_init(&dev->execute_task_lock);
1325         spin_lock_init(&dev->delayed_cmd_lock);
1326         spin_lock_init(&dev->dev_reservation_lock);
1327         spin_lock_init(&dev->dev_status_lock);
1328         spin_lock_init(&dev->se_port_lock);
1329         spin_lock_init(&dev->se_tmr_lock);
1330         spin_lock_init(&dev->qf_cmd_lock);
1331         atomic_set(&dev->dev_ordered_id, 0);
1332
1333         se_dev_set_default_attribs(dev, dev_limits);
1334
1335         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1336         dev->creation_time = get_jiffies_64();
1337         spin_lock_init(&dev->stats_lock);
1338
1339         spin_lock(&hba->device_lock);
1340         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1341         hba->dev_count++;
1342         spin_unlock(&hba->device_lock);
1343         /*
1344          * Setup the SAM Task Attribute emulation for struct se_device
1345          */
1346         core_setup_task_attr_emulation(dev);
1347         /*
1348          * Force PR and ALUA passthrough emulation with internal object use.
1349          */
1350         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1351         /*
1352          * Setup the Reservations infrastructure for struct se_device
1353          */
1354         core_setup_reservations(dev, force_pt);
1355         /*
1356          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1357          */
1358         if (core_setup_alua(dev, force_pt) < 0)
1359                 goto out;
1360
1361         /*
1362          * Startup the struct se_device processing thread
1363          */
1364         dev->process_thread = kthread_run(transport_processing_thread, dev,
1365                                           "LIO_%s", dev->transport->name);
1366         if (IS_ERR(dev->process_thread)) {
1367                 pr_err("Unable to create kthread: LIO_%s\n",
1368                         dev->transport->name);
1369                 goto out;
1370         }
1371         /*
1372          * Setup work_queue for QUEUE_FULL
1373          */
1374         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1375         /*
1376          * Preload the initial INQUIRY const values if we are doing
1377          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1378          * passthrough because this is being provided by the backend LLD.
1379          * This is required so that transport_get_inquiry() copies these
1380          * originals once back into DEV_T10_WWN(dev) for the virtual device
1381          * setup.
1382          */
1383         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1384                 if (!inquiry_prod || !inquiry_rev) {
1385                         pr_err("All non TCM/pSCSI plugins require"
1386                                 " INQUIRY consts\n");
1387                         goto out;
1388                 }
1389
1390                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1391                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1392                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1393         }
1394         scsi_dump_inquiry(dev);
1395
1396         return dev;
1397 out:
1398         kthread_stop(dev->process_thread);
1399
1400         spin_lock(&hba->device_lock);
1401         list_del(&dev->dev_list);
1402         hba->dev_count--;
1403         spin_unlock(&hba->device_lock);
1404
1405         se_release_vpd_for_dev(dev);
1406
1407         kfree(dev);
1408
1409         return NULL;
1410 }
1411 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1412
1413 /*      transport_generic_prepare_cdb():
1414  *
1415  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1416  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1417  *      The point of this is since we are mapping iSCSI LUNs to
1418  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1419  *      devices and HBAs for a loop.
1420  */
1421 static inline void transport_generic_prepare_cdb(
1422         unsigned char *cdb)
1423 {
1424         switch (cdb[0]) {
1425         case READ_10: /* SBC - RDProtect */
1426         case READ_12: /* SBC - RDProtect */
1427         case READ_16: /* SBC - RDProtect */
1428         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1429         case VERIFY: /* SBC - VRProtect */
1430         case VERIFY_16: /* SBC - VRProtect */
1431         case WRITE_VERIFY: /* SBC - VRProtect */
1432         case WRITE_VERIFY_12: /* SBC - VRProtect */
1433                 break;
1434         default:
1435                 cdb[1] &= 0x1f; /* clear logical unit number */
1436                 break;
1437         }
1438 }
1439
1440 static struct se_task *
1441 transport_generic_get_task(struct se_cmd *cmd,
1442                 enum dma_data_direction data_direction)
1443 {
1444         struct se_task *task;
1445         struct se_device *dev = cmd->se_dev;
1446
1447         task = dev->transport->alloc_task(cmd->t_task_cdb);
1448         if (!task) {
1449                 pr_err("Unable to allocate struct se_task\n");
1450                 return NULL;
1451         }
1452
1453         INIT_LIST_HEAD(&task->t_list);
1454         INIT_LIST_HEAD(&task->t_execute_list);
1455         INIT_LIST_HEAD(&task->t_state_list);
1456         init_completion(&task->task_stop_comp);
1457         task->task_se_cmd = cmd;
1458         task->task_data_direction = data_direction;
1459
1460         return task;
1461 }
1462
1463 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1464
1465 /*
1466  * Used by fabric modules containing a local struct se_cmd within their
1467  * fabric dependent per I/O descriptor.
1468  */
1469 void transport_init_se_cmd(
1470         struct se_cmd *cmd,
1471         struct target_core_fabric_ops *tfo,
1472         struct se_session *se_sess,
1473         u32 data_length,
1474         int data_direction,
1475         int task_attr,
1476         unsigned char *sense_buffer)
1477 {
1478         INIT_LIST_HEAD(&cmd->se_lun_node);
1479         INIT_LIST_HEAD(&cmd->se_delayed_node);
1480         INIT_LIST_HEAD(&cmd->se_qf_node);
1481         INIT_LIST_HEAD(&cmd->se_queue_node);
1482         INIT_LIST_HEAD(&cmd->se_cmd_list);
1483         INIT_LIST_HEAD(&cmd->t_task_list);
1484         init_completion(&cmd->transport_lun_fe_stop_comp);
1485         init_completion(&cmd->transport_lun_stop_comp);
1486         init_completion(&cmd->t_transport_stop_comp);
1487         init_completion(&cmd->cmd_wait_comp);
1488         spin_lock_init(&cmd->t_state_lock);
1489         atomic_set(&cmd->transport_dev_active, 1);
1490
1491         cmd->se_tfo = tfo;
1492         cmd->se_sess = se_sess;
1493         cmd->data_length = data_length;
1494         cmd->data_direction = data_direction;
1495         cmd->sam_task_attr = task_attr;
1496         cmd->sense_buffer = sense_buffer;
1497 }
1498 EXPORT_SYMBOL(transport_init_se_cmd);
1499
1500 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1501 {
1502         /*
1503          * Check if SAM Task Attribute emulation is enabled for this
1504          * struct se_device storage object
1505          */
1506         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1507                 return 0;
1508
1509         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1510                 pr_debug("SAM Task Attribute ACA"
1511                         " emulation is not supported\n");
1512                 return -EINVAL;
1513         }
1514         /*
1515          * Used to determine when ORDERED commands should go from
1516          * Dormant to Active status.
1517          */
1518         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1519         smp_mb__after_atomic_inc();
1520         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1521                         cmd->se_ordered_id, cmd->sam_task_attr,
1522                         cmd->se_dev->transport->name);
1523         return 0;
1524 }
1525
1526 /*      transport_generic_allocate_tasks():
1527  *
1528  *      Called from fabric RX Thread.
1529  */
1530 int transport_generic_allocate_tasks(
1531         struct se_cmd *cmd,
1532         unsigned char *cdb)
1533 {
1534         int ret;
1535
1536         transport_generic_prepare_cdb(cdb);
1537         /*
1538          * Ensure that the received CDB is less than the max (252 + 8) bytes
1539          * for VARIABLE_LENGTH_CMD
1540          */
1541         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1542                 pr_err("Received SCSI CDB with command_size: %d that"
1543                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1544                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1545                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1546                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1547                 return -EINVAL;
1548         }
1549         /*
1550          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1551          * allocate the additional extended CDB buffer now..  Otherwise
1552          * setup the pointer from __t_task_cdb to t_task_cdb.
1553          */
1554         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1555                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1556                                                 GFP_KERNEL);
1557                 if (!cmd->t_task_cdb) {
1558                         pr_err("Unable to allocate cmd->t_task_cdb"
1559                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1560                                 scsi_command_size(cdb),
1561                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1562                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1563                         cmd->scsi_sense_reason =
1564                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1565                         return -ENOMEM;
1566                 }
1567         } else
1568                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1569         /*
1570          * Copy the original CDB into cmd->
1571          */
1572         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1573         /*
1574          * Setup the received CDB based on SCSI defined opcodes and
1575          * perform unit attention, persistent reservations and ALUA
1576          * checks for virtual device backends.  The cmd->t_task_cdb
1577          * pointer is expected to be setup before we reach this point.
1578          */
1579         ret = transport_generic_cmd_sequencer(cmd, cdb);
1580         if (ret < 0)
1581                 return ret;
1582         /*
1583          * Check for SAM Task Attribute Emulation
1584          */
1585         if (transport_check_alloc_task_attr(cmd) < 0) {
1586                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1587                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1588                 return -EINVAL;
1589         }
1590         spin_lock(&cmd->se_lun->lun_sep_lock);
1591         if (cmd->se_lun->lun_sep)
1592                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1593         spin_unlock(&cmd->se_lun->lun_sep_lock);
1594         return 0;
1595 }
1596 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1597
1598 /*
1599  * Used by fabric module frontends to queue tasks directly.
1600  * Many only be used from process context only
1601  */
1602 int transport_handle_cdb_direct(
1603         struct se_cmd *cmd)
1604 {
1605         int ret;
1606
1607         if (!cmd->se_lun) {
1608                 dump_stack();
1609                 pr_err("cmd->se_lun is NULL\n");
1610                 return -EINVAL;
1611         }
1612         if (in_interrupt()) {
1613                 dump_stack();
1614                 pr_err("transport_generic_handle_cdb cannot be called"
1615                                 " from interrupt context\n");
1616                 return -EINVAL;
1617         }
1618         /*
1619          * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1620          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1621          * in existing usage to ensure that outstanding descriptors are handled
1622          * correctly during shutdown via transport_wait_for_tasks()
1623          *
1624          * Also, we don't take cmd->t_state_lock here as we only expect
1625          * this to be called for initial descriptor submission.
1626          */
1627         cmd->t_state = TRANSPORT_NEW_CMD;
1628         atomic_set(&cmd->t_transport_active, 1);
1629         /*
1630          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1631          * so follow TRANSPORT_NEW_CMD processing thread context usage
1632          * and call transport_generic_request_failure() if necessary..
1633          */
1634         ret = transport_generic_new_cmd(cmd);
1635         if (ret < 0)
1636                 transport_generic_request_failure(cmd);
1637
1638         return 0;
1639 }
1640 EXPORT_SYMBOL(transport_handle_cdb_direct);
1641
1642 /**
1643  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1644  *
1645  * @se_cmd: command descriptor to submit
1646  * @se_sess: associated se_sess for endpoint
1647  * @cdb: pointer to SCSI CDB
1648  * @sense: pointer to SCSI sense buffer
1649  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1650  * @data_length: fabric expected data transfer length
1651  * @task_addr: SAM task attribute
1652  * @data_dir: DMA data direction
1653  * @flags: flags for command submission from target_sc_flags_tables
1654  *
1655  * This may only be called from process context, and also currently
1656  * assumes internal allocation of fabric payload buffer by target-core.
1657  **/
1658 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1659                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1660                 u32 data_length, int task_attr, int data_dir, int flags)
1661 {
1662         struct se_portal_group *se_tpg;
1663         int rc;
1664
1665         se_tpg = se_sess->se_tpg;
1666         BUG_ON(!se_tpg);
1667         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1668         BUG_ON(in_interrupt());
1669         /*
1670          * Initialize se_cmd for target operation.  From this point
1671          * exceptions are handled by sending exception status via
1672          * target_core_fabric_ops->queue_status() callback
1673          */
1674         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1675                                 data_length, data_dir, task_attr, sense);
1676         /*
1677          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1678          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1679          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1680          * kref_put() to happen during fabric packet acknowledgement.
1681          */
1682         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1683         /*
1684          * Signal bidirectional data payloads to target-core
1685          */
1686         if (flags & TARGET_SCF_BIDI_OP)
1687                 se_cmd->se_cmd_flags |= SCF_BIDI;
1688         /*
1689          * Locate se_lun pointer and attach it to struct se_cmd
1690          */
1691         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0)
1692                 goto out_check_cond;
1693         /*
1694          * Sanitize CDBs via transport_generic_cmd_sequencer() and
1695          * allocate the necessary tasks to complete the received CDB+data
1696          */
1697         rc = transport_generic_allocate_tasks(se_cmd, cdb);
1698         if (rc != 0)
1699                 goto out_check_cond;
1700         /*
1701          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1702          * for immediate execution of READs, otherwise wait for
1703          * transport_generic_handle_data() to be called for WRITEs
1704          * when fabric has filled the incoming buffer.
1705          */
1706         transport_handle_cdb_direct(se_cmd);
1707         return 0;
1708
1709 out_check_cond:
1710         transport_send_check_condition_and_sense(se_cmd,
1711                                 se_cmd->scsi_sense_reason, 0);
1712         return 0;
1713 }
1714 EXPORT_SYMBOL(target_submit_cmd);
1715
1716 /*
1717  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1718  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1719  * complete setup in TCM process context w/ TFO->new_cmd_map().
1720  */
1721 int transport_generic_handle_cdb_map(
1722         struct se_cmd *cmd)
1723 {
1724         if (!cmd->se_lun) {
1725                 dump_stack();
1726                 pr_err("cmd->se_lun is NULL\n");
1727                 return -EINVAL;
1728         }
1729
1730         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1731         return 0;
1732 }
1733 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1734
1735 /*      transport_generic_handle_data():
1736  *
1737  *
1738  */
1739 int transport_generic_handle_data(
1740         struct se_cmd *cmd)
1741 {
1742         /*
1743          * For the software fabric case, then we assume the nexus is being
1744          * failed/shutdown when signals are pending from the kthread context
1745          * caller, so we return a failure.  For the HW target mode case running
1746          * in interrupt code, the signal_pending() check is skipped.
1747          */
1748         if (!in_interrupt() && signal_pending(current))
1749                 return -EPERM;
1750         /*
1751          * If the received CDB has aleady been ABORTED by the generic
1752          * target engine, we now call transport_check_aborted_status()
1753          * to queue any delated TASK_ABORTED status for the received CDB to the
1754          * fabric module as we are expecting no further incoming DATA OUT
1755          * sequences at this point.
1756          */
1757         if (transport_check_aborted_status(cmd, 1) != 0)
1758                 return 0;
1759
1760         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1761         return 0;
1762 }
1763 EXPORT_SYMBOL(transport_generic_handle_data);
1764
1765 /*      transport_generic_handle_tmr():
1766  *
1767  *
1768  */
1769 int transport_generic_handle_tmr(
1770         struct se_cmd *cmd)
1771 {
1772         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1773         return 0;
1774 }
1775 EXPORT_SYMBOL(transport_generic_handle_tmr);
1776
1777 /*
1778  * If the task is active, request it to be stopped and sleep until it
1779  * has completed.
1780  */
1781 bool target_stop_task(struct se_task *task, unsigned long *flags)
1782 {
1783         struct se_cmd *cmd = task->task_se_cmd;
1784         bool was_active = false;
1785
1786         if (task->task_flags & TF_ACTIVE) {
1787                 task->task_flags |= TF_REQUEST_STOP;
1788                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1789
1790                 pr_debug("Task %p waiting to complete\n", task);
1791                 wait_for_completion(&task->task_stop_comp);
1792                 pr_debug("Task %p stopped successfully\n", task);
1793
1794                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1795                 atomic_dec(&cmd->t_task_cdbs_left);
1796                 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1797                 was_active = true;
1798         }
1799
1800         return was_active;
1801 }
1802
1803 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1804 {
1805         struct se_task *task, *task_tmp;
1806         unsigned long flags;
1807         int ret = 0;
1808
1809         pr_debug("ITT[0x%08x] - Stopping tasks\n",
1810                 cmd->se_tfo->get_task_tag(cmd));
1811
1812         /*
1813          * No tasks remain in the execution queue
1814          */
1815         spin_lock_irqsave(&cmd->t_state_lock, flags);
1816         list_for_each_entry_safe(task, task_tmp,
1817                                 &cmd->t_task_list, t_list) {
1818                 pr_debug("Processing task %p\n", task);
1819                 /*
1820                  * If the struct se_task has not been sent and is not active,
1821                  * remove the struct se_task from the execution queue.
1822                  */
1823                 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1824                         spin_unlock_irqrestore(&cmd->t_state_lock,
1825                                         flags);
1826                         transport_remove_task_from_execute_queue(task,
1827                                         cmd->se_dev);
1828
1829                         pr_debug("Task %p removed from execute queue\n", task);
1830                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1831                         continue;
1832                 }
1833
1834                 if (!target_stop_task(task, &flags)) {
1835                         pr_debug("Task %p - did nothing\n", task);
1836                         ret++;
1837                 }
1838         }
1839         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1840
1841         return ret;
1842 }
1843
1844 /*
1845  * Handle SAM-esque emulation for generic transport request failures.
1846  */
1847 static void transport_generic_request_failure(struct se_cmd *cmd)
1848 {
1849         int ret = 0;
1850
1851         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1852                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1853                 cmd->t_task_cdb[0]);
1854         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1855                 cmd->se_tfo->get_cmd_state(cmd),
1856                 cmd->t_state, cmd->scsi_sense_reason);
1857         pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1858                 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1859                 " t_transport_active: %d t_transport_stop: %d"
1860                 " t_transport_sent: %d\n", cmd->t_task_list_num,
1861                 atomic_read(&cmd->t_task_cdbs_left),
1862                 atomic_read(&cmd->t_task_cdbs_sent),
1863                 atomic_read(&cmd->t_task_cdbs_ex_left),
1864                 atomic_read(&cmd->t_transport_active),
1865                 atomic_read(&cmd->t_transport_stop),
1866                 atomic_read(&cmd->t_transport_sent));
1867
1868         /*
1869          * For SAM Task Attribute emulation for failed struct se_cmd
1870          */
1871         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1872                 transport_complete_task_attr(cmd);
1873
1874         switch (cmd->scsi_sense_reason) {
1875         case TCM_NON_EXISTENT_LUN:
1876         case TCM_UNSUPPORTED_SCSI_OPCODE:
1877         case TCM_INVALID_CDB_FIELD:
1878         case TCM_INVALID_PARAMETER_LIST:
1879         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1880         case TCM_UNKNOWN_MODE_PAGE:
1881         case TCM_WRITE_PROTECTED:
1882         case TCM_CHECK_CONDITION_ABORT_CMD:
1883         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1884         case TCM_CHECK_CONDITION_NOT_READY:
1885                 break;
1886         case TCM_RESERVATION_CONFLICT:
1887                 /*
1888                  * No SENSE Data payload for this case, set SCSI Status
1889                  * and queue the response to $FABRIC_MOD.
1890                  *
1891                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1892                  */
1893                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1894                 /*
1895                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1896                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1897                  * CONFLICT STATUS.
1898                  *
1899                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1900                  */
1901                 if (cmd->se_sess &&
1902                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1903                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1904                                 cmd->orig_fe_lun, 0x2C,
1905                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1906
1907                 ret = cmd->se_tfo->queue_status(cmd);
1908                 if (ret == -EAGAIN || ret == -ENOMEM)
1909                         goto queue_full;
1910                 goto check_stop;
1911         default:
1912                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1913                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1914                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1915                 break;
1916         }
1917         /*
1918          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1919          * make the call to transport_send_check_condition_and_sense()
1920          * directly.  Otherwise expect the fabric to make the call to
1921          * transport_send_check_condition_and_sense() after handling
1922          * possible unsoliticied write data payloads.
1923          */
1924         ret = transport_send_check_condition_and_sense(cmd,
1925                         cmd->scsi_sense_reason, 0);
1926         if (ret == -EAGAIN || ret == -ENOMEM)
1927                 goto queue_full;
1928
1929 check_stop:
1930         transport_lun_remove_cmd(cmd);
1931         if (!transport_cmd_check_stop_to_fabric(cmd))
1932                 ;
1933         return;
1934
1935 queue_full:
1936         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1937         transport_handle_queue_full(cmd, cmd->se_dev);
1938 }
1939
1940 static inline u32 transport_lba_21(unsigned char *cdb)
1941 {
1942         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1943 }
1944
1945 static inline u32 transport_lba_32(unsigned char *cdb)
1946 {
1947         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1948 }
1949
1950 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1951 {
1952         unsigned int __v1, __v2;
1953
1954         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1955         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1956
1957         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1958 }
1959
1960 /*
1961  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1962  */
1963 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1964 {
1965         unsigned int __v1, __v2;
1966
1967         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1968         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1969
1970         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1971 }
1972
1973 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1974 {
1975         unsigned long flags;
1976
1977         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1978         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1979         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1980 }
1981
1982 /*
1983  * Called from Fabric Module context from transport_execute_tasks()
1984  *
1985  * The return of this function determins if the tasks from struct se_cmd
1986  * get added to the execution queue in transport_execute_tasks(),
1987  * or are added to the delayed or ordered lists here.
1988  */
1989 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1990 {
1991         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1992                 return 1;
1993         /*
1994          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1995          * to allow the passed struct se_cmd list of tasks to the front of the list.
1996          */
1997          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1998                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1999                         " 0x%02x, se_ordered_id: %u\n",
2000                         cmd->t_task_cdb[0],
2001                         cmd->se_ordered_id);
2002                 return 1;
2003         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2004                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2005                 smp_mb__after_atomic_inc();
2006
2007                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2008                                 " list, se_ordered_id: %u\n",
2009                                 cmd->t_task_cdb[0],
2010                                 cmd->se_ordered_id);
2011                 /*
2012                  * Add ORDERED command to tail of execution queue if
2013                  * no other older commands exist that need to be
2014                  * completed first.
2015                  */
2016                 if (!atomic_read(&cmd->se_dev->simple_cmds))
2017                         return 1;
2018         } else {
2019                 /*
2020                  * For SIMPLE and UNTAGGED Task Attribute commands
2021                  */
2022                 atomic_inc(&cmd->se_dev->simple_cmds);
2023                 smp_mb__after_atomic_inc();
2024         }
2025         /*
2026          * Otherwise if one or more outstanding ORDERED task attribute exist,
2027          * add the dormant task(s) built for the passed struct se_cmd to the
2028          * execution queue and become in Active state for this struct se_device.
2029          */
2030         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2031                 /*
2032                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
2033                  * will be drained upon completion of HEAD_OF_QUEUE task.
2034                  */
2035                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2036                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2037                 list_add_tail(&cmd->se_delayed_node,
2038                                 &cmd->se_dev->delayed_cmd_list);
2039                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2040
2041                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2042                         " delayed CMD list, se_ordered_id: %u\n",
2043                         cmd->t_task_cdb[0], cmd->sam_task_attr,
2044                         cmd->se_ordered_id);
2045                 /*
2046                  * Return zero to let transport_execute_tasks() know
2047                  * not to add the delayed tasks to the execution list.
2048                  */
2049                 return 0;
2050         }
2051         /*
2052          * Otherwise, no ORDERED task attributes exist..
2053          */
2054         return 1;
2055 }
2056
2057 /*
2058  * Called from fabric module context in transport_generic_new_cmd() and
2059  * transport_generic_process_write()
2060  */
2061 static int transport_execute_tasks(struct se_cmd *cmd)
2062 {
2063         int add_tasks;
2064         struct se_device *se_dev = cmd->se_dev;
2065
2066         if (se_dev_check_online(cmd->se_dev) != 0) {
2067                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2068                 transport_generic_request_failure(cmd);
2069                 return 0;
2070         }
2071
2072         /*
2073          * Call transport_cmd_check_stop() to see if a fabric exception
2074          * has occurred that prevents execution.
2075          */
2076         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2077                 /*
2078                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2079                  * attribute for the tasks of the received struct se_cmd CDB
2080                  */
2081                 add_tasks = transport_execute_task_attr(cmd);
2082                 if (!add_tasks)
2083                         goto execute_tasks;
2084                 /*
2085                  * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2086                  * adds associated se_tasks while holding dev->execute_task_lock
2087                  * before I/O dispath to avoid a double spinlock access.
2088                  */
2089                 __transport_execute_tasks(se_dev, cmd);
2090                 return 0;
2091         }
2092
2093 execute_tasks:
2094         __transport_execute_tasks(se_dev, NULL);
2095         return 0;
2096 }
2097
2098 /*
2099  * Called to check struct se_device tcq depth window, and once open pull struct se_task
2100  * from struct se_device->execute_task_list and
2101  *
2102  * Called from transport_processing_thread()
2103  */
2104 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
2105 {
2106         int error;
2107         struct se_cmd *cmd = NULL;
2108         struct se_task *task = NULL;
2109         unsigned long flags;
2110
2111 check_depth:
2112         spin_lock_irq(&dev->execute_task_lock);
2113         if (new_cmd != NULL)
2114                 __transport_add_tasks_from_cmd(new_cmd);
2115
2116         if (list_empty(&dev->execute_task_list)) {
2117                 spin_unlock_irq(&dev->execute_task_lock);
2118                 return 0;
2119         }
2120         task = list_first_entry(&dev->execute_task_list,
2121                                 struct se_task, t_execute_list);
2122         __transport_remove_task_from_execute_queue(task, dev);
2123         spin_unlock_irq(&dev->execute_task_lock);
2124
2125         cmd = task->task_se_cmd;
2126         spin_lock_irqsave(&cmd->t_state_lock, flags);
2127         task->task_flags |= (TF_ACTIVE | TF_SENT);
2128         atomic_inc(&cmd->t_task_cdbs_sent);
2129
2130         if (atomic_read(&cmd->t_task_cdbs_sent) ==
2131             cmd->t_task_list_num)
2132                 atomic_set(&cmd->t_transport_sent, 1);
2133
2134         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2135
2136         if (cmd->execute_task)
2137                 error = cmd->execute_task(task);
2138         else
2139                 error = dev->transport->do_task(task);
2140         if (error != 0) {
2141                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2142                 task->task_flags &= ~TF_ACTIVE;
2143                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2144                 atomic_set(&cmd->t_transport_sent, 0);
2145                 transport_stop_tasks_for_cmd(cmd);
2146                 transport_generic_request_failure(cmd);
2147         }
2148
2149         new_cmd = NULL;
2150         goto check_depth;
2151
2152         return 0;
2153 }
2154
2155 static inline u32 transport_get_sectors_6(
2156         unsigned char *cdb,
2157         struct se_cmd *cmd,
2158         int *ret)
2159 {
2160         struct se_device *dev = cmd->se_dev;
2161
2162         /*
2163          * Assume TYPE_DISK for non struct se_device objects.
2164          * Use 8-bit sector value.
2165          */
2166         if (!dev)
2167                 goto type_disk;
2168
2169         /*
2170          * Use 24-bit allocation length for TYPE_TAPE.
2171          */
2172         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2173                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2174
2175         /*
2176          * Everything else assume TYPE_DISK Sector CDB location.
2177          * Use 8-bit sector value.  SBC-3 says:
2178          *
2179          *   A TRANSFER LENGTH field set to zero specifies that 256
2180          *   logical blocks shall be written.  Any other value
2181          *   specifies the number of logical blocks that shall be
2182          *   written.
2183          */
2184 type_disk:
2185         return cdb[4] ? : 256;
2186 }
2187
2188 static inline u32 transport_get_sectors_10(
2189         unsigned char *cdb,
2190         struct se_cmd *cmd,
2191         int *ret)
2192 {
2193         struct se_device *dev = cmd->se_dev;
2194
2195         /*
2196          * Assume TYPE_DISK for non struct se_device objects.
2197          * Use 16-bit sector value.
2198          */
2199         if (!dev)
2200                 goto type_disk;
2201
2202         /*
2203          * XXX_10 is not defined in SSC, throw an exception
2204          */
2205         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2206                 *ret = -EINVAL;
2207                 return 0;
2208         }
2209
2210         /*
2211          * Everything else assume TYPE_DISK Sector CDB location.
2212          * Use 16-bit sector value.
2213          */
2214 type_disk:
2215         return (u32)(cdb[7] << 8) + cdb[8];
2216 }
2217
2218 static inline u32 transport_get_sectors_12(
2219         unsigned char *cdb,
2220         struct se_cmd *cmd,
2221         int *ret)
2222 {
2223         struct se_device *dev = cmd->se_dev;
2224
2225         /*
2226          * Assume TYPE_DISK for non struct se_device objects.
2227          * Use 32-bit sector value.
2228          */
2229         if (!dev)
2230                 goto type_disk;
2231
2232         /*
2233          * XXX_12 is not defined in SSC, throw an exception
2234          */
2235         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2236                 *ret = -EINVAL;
2237                 return 0;
2238         }
2239
2240         /*
2241          * Everything else assume TYPE_DISK Sector CDB location.
2242          * Use 32-bit sector value.
2243          */
2244 type_disk:
2245         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2246 }
2247
2248 static inline u32 transport_get_sectors_16(
2249         unsigned char *cdb,
2250         struct se_cmd *cmd,
2251         int *ret)
2252 {
2253         struct se_device *dev = cmd->se_dev;
2254
2255         /*
2256          * Assume TYPE_DISK for non struct se_device objects.
2257          * Use 32-bit sector value.
2258          */
2259         if (!dev)
2260                 goto type_disk;
2261
2262         /*
2263          * Use 24-bit allocation length for TYPE_TAPE.
2264          */
2265         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2266                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2267
2268 type_disk:
2269         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2270                     (cdb[12] << 8) + cdb[13];
2271 }
2272
2273 /*
2274  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2275  */
2276 static inline u32 transport_get_sectors_32(
2277         unsigned char *cdb,
2278         struct se_cmd *cmd,
2279         int *ret)
2280 {
2281         /*
2282          * Assume TYPE_DISK for non struct se_device objects.
2283          * Use 32-bit sector value.
2284          */
2285         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2286                     (cdb[30] << 8) + cdb[31];
2287
2288 }
2289
2290 static inline u32 transport_get_size(
2291         u32 sectors,
2292         unsigned char *cdb,
2293         struct se_cmd *cmd)
2294 {
2295         struct se_device *dev = cmd->se_dev;
2296
2297         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2298                 if (cdb[1] & 1) { /* sectors */
2299                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2300                 } else /* bytes */
2301                         return sectors;
2302         }
2303 #if 0
2304         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2305                         " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2306                         dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2307                         dev->transport->name);
2308 #endif
2309         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2310 }
2311
2312 static void transport_xor_callback(struct se_cmd *cmd)
2313 {
2314         unsigned char *buf, *addr;
2315         struct scatterlist *sg;
2316         unsigned int offset;
2317         int i;
2318         int count;
2319         /*
2320          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2321          *
2322          * 1) read the specified logical block(s);
2323          * 2) transfer logical blocks from the data-out buffer;
2324          * 3) XOR the logical blocks transferred from the data-out buffer with
2325          *    the logical blocks read, storing the resulting XOR data in a buffer;
2326          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2327          *    blocks transferred from the data-out buffer; and
2328          * 5) transfer the resulting XOR data to the data-in buffer.
2329          */
2330         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2331         if (!buf) {
2332                 pr_err("Unable to allocate xor_callback buf\n");
2333                 return;
2334         }
2335         /*
2336          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2337          * into the locally allocated *buf
2338          */
2339         sg_copy_to_buffer(cmd->t_data_sg,
2340                           cmd->t_data_nents,
2341                           buf,
2342                           cmd->data_length);
2343
2344         /*
2345          * Now perform the XOR against the BIDI read memory located at
2346          * cmd->t_mem_bidi_list
2347          */
2348
2349         offset = 0;
2350         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2351                 addr = kmap_atomic(sg_page(sg), KM_USER0);
2352                 if (!addr)
2353                         goto out;
2354
2355                 for (i = 0; i < sg->length; i++)
2356                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2357
2358                 offset += sg->length;
2359                 kunmap_atomic(addr, KM_USER0);
2360         }
2361
2362 out:
2363         kfree(buf);
2364 }
2365
2366 /*
2367  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2368  */
2369 static int transport_get_sense_data(struct se_cmd *cmd)
2370 {
2371         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2372         struct se_device *dev = cmd->se_dev;
2373         struct se_task *task = NULL, *task_tmp;
2374         unsigned long flags;
2375         u32 offset = 0;
2376
2377         WARN_ON(!cmd->se_lun);
2378
2379         if (!dev)
2380                 return 0;
2381
2382         spin_lock_irqsave(&cmd->t_state_lock, flags);
2383         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2384                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2385                 return 0;
2386         }
2387
2388         list_for_each_entry_safe(task, task_tmp,
2389                                 &cmd->t_task_list, t_list) {
2390                 if (!(task->task_flags & TF_HAS_SENSE))
2391                         continue;
2392
2393                 if (!dev->transport->get_sense_buffer) {
2394                         pr_err("dev->transport->get_sense_buffer"
2395                                         " is NULL\n");
2396                         continue;
2397                 }
2398
2399                 sense_buffer = dev->transport->get_sense_buffer(task);
2400                 if (!sense_buffer) {
2401                         pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2402                                 " sense buffer for task with sense\n",
2403                                 cmd->se_tfo->get_task_tag(cmd), task);
2404                         continue;
2405                 }
2406                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2407
2408                 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2409                                 TRANSPORT_SENSE_BUFFER);
2410
2411                 memcpy(&buffer[offset], sense_buffer,
2412                                 TRANSPORT_SENSE_BUFFER);
2413                 cmd->scsi_status = task->task_scsi_status;
2414                 /* Automatically padded */
2415                 cmd->scsi_sense_length =
2416                                 (TRANSPORT_SENSE_BUFFER + offset);
2417
2418                 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2419                                 " and sense\n",
2420                         dev->se_hba->hba_id, dev->transport->name,
2421                                 cmd->scsi_status);
2422                 return 0;
2423         }
2424         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2425
2426         return -1;
2427 }
2428
2429 static inline long long transport_dev_end_lba(struct se_device *dev)
2430 {
2431         return dev->transport->get_blocks(dev) + 1;
2432 }
2433
2434 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2435 {
2436         struct se_device *dev = cmd->se_dev;
2437         u32 sectors;
2438
2439         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2440                 return 0;
2441
2442         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2443
2444         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2445                 pr_err("LBA: %llu Sectors: %u exceeds"
2446                         " transport_dev_end_lba(): %llu\n",
2447                         cmd->t_task_lba, sectors,
2448                         transport_dev_end_lba(dev));
2449                 return -EINVAL;
2450         }
2451
2452         return 0;
2453 }
2454
2455 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2456 {
2457         /*
2458          * Determine if the received WRITE_SAME is used to for direct
2459          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2460          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2461          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2462          */
2463         int passthrough = (dev->transport->transport_type ==
2464                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2465
2466         if (!passthrough) {
2467                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2468                         pr_err("WRITE_SAME PBDATA and LBDATA"
2469                                 " bits not supported for Block Discard"
2470                                 " Emulation\n");
2471                         return -ENOSYS;
2472                 }
2473                 /*
2474                  * Currently for the emulated case we only accept
2475                  * tpws with the UNMAP=1 bit set.
2476                  */
2477                 if (!(flags[0] & 0x08)) {
2478                         pr_err("WRITE_SAME w/o UNMAP bit not"
2479                                 " supported for Block Discard Emulation\n");
2480                         return -ENOSYS;
2481                 }
2482         }
2483
2484         return 0;
2485 }
2486
2487 /*      transport_generic_cmd_sequencer():
2488  *
2489  *      Generic Command Sequencer that should work for most DAS transport
2490  *      drivers.
2491  *
2492  *      Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2493  *      RX Thread.
2494  *
2495  *      FIXME: Need to support other SCSI OPCODES where as well.
2496  */
2497 static int transport_generic_cmd_sequencer(
2498         struct se_cmd *cmd,
2499         unsigned char *cdb)
2500 {
2501         struct se_device *dev = cmd->se_dev;
2502         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2503         int ret = 0, sector_ret = 0, passthrough;
2504         u32 sectors = 0, size = 0, pr_reg_type = 0;
2505         u16 service_action;
2506         u8 alua_ascq = 0;
2507         /*
2508          * Check for an existing UNIT ATTENTION condition
2509          */
2510         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2511                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2512                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2513                 return -EINVAL;
2514         }
2515         /*
2516          * Check status of Asymmetric Logical Unit Assignment port
2517          */
2518         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2519         if (ret != 0) {
2520                 /*
2521                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2522                  * The ALUA additional sense code qualifier (ASCQ) is determined
2523                  * by the ALUA primary or secondary access state..
2524                  */
2525                 if (ret > 0) {
2526 #if 0
2527                         pr_debug("[%s]: ALUA TG Port not available,"
2528                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2529                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2530 #endif
2531                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2532                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2533                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2534                         return -EINVAL;
2535                 }
2536                 goto out_invalid_cdb_field;
2537         }
2538         /*
2539          * Check status for SPC-3 Persistent Reservations
2540          */
2541         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2542                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2543                                         cmd, cdb, pr_reg_type) != 0) {
2544                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2545                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2546                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2547                         return -EBUSY;
2548                 }
2549                 /*
2550                  * This means the CDB is allowed for the SCSI Initiator port
2551                  * when said port is *NOT* holding the legacy SPC-2 or
2552                  * SPC-3 Persistent Reservation.
2553                  */
2554         }
2555
2556         /*
2557          * If we operate in passthrough mode we skip most CDB emulation and
2558          * instead hand the commands down to the physical SCSI device.
2559          */
2560         passthrough =
2561                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2562
2563         switch (cdb[0]) {
2564         case READ_6:
2565                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2566                 if (sector_ret)
2567                         goto out_unsupported_cdb;
2568                 size = transport_get_size(sectors, cdb, cmd);
2569                 cmd->t_task_lba = transport_lba_21(cdb);
2570                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2571                 break;
2572         case READ_10:
2573                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2574                 if (sector_ret)
2575                         goto out_unsupported_cdb;
2576                 size = transport_get_size(sectors, cdb, cmd);
2577                 cmd->t_task_lba = transport_lba_32(cdb);
2578                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2579                 break;
2580         case READ_12:
2581                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2582                 if (sector_ret)
2583                         goto out_unsupported_cdb;
2584                 size = transport_get_size(sectors, cdb, cmd);
2585                 cmd->t_task_lba = transport_lba_32(cdb);
2586                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2587                 break;
2588         case READ_16:
2589                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2590                 if (sector_ret)
2591                         goto out_unsupported_cdb;
2592                 size = transport_get_size(sectors, cdb, cmd);
2593                 cmd->t_task_lba = transport_lba_64(cdb);
2594                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2595                 break;
2596         case WRITE_6:
2597                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2598                 if (sector_ret)
2599                         goto out_unsupported_cdb;
2600                 size = transport_get_size(sectors, cdb, cmd);
2601                 cmd->t_task_lba = transport_lba_21(cdb);
2602                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2603                 break;
2604         case WRITE_10:
2605                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2606                 if (sector_ret)
2607                         goto out_unsupported_cdb;
2608                 size = transport_get_size(sectors, cdb, cmd);
2609                 cmd->t_task_lba = transport_lba_32(cdb);
2610                 if (cdb[1] & 0x8)
2611                         cmd->se_cmd_flags |= SCF_FUA;
2612                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2613                 break;
2614         case WRITE_12:
2615                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2616                 if (sector_ret)
2617                         goto out_unsupported_cdb;
2618                 size = transport_get_size(sectors, cdb, cmd);
2619                 cmd->t_task_lba = transport_lba_32(cdb);
2620                 if (cdb[1] & 0x8)
2621                         cmd->se_cmd_flags |= SCF_FUA;
2622                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2623                 break;
2624         case WRITE_16:
2625                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2626                 if (sector_ret)
2627                         goto out_unsupported_cdb;
2628                 size = transport_get_size(sectors, cdb, cmd);
2629                 cmd->t_task_lba = transport_lba_64(cdb);
2630                 if (cdb[1] & 0x8)
2631                         cmd->se_cmd_flags |= SCF_FUA;
2632                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2633                 break;
2634         case XDWRITEREAD_10:
2635                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2636                     !(cmd->se_cmd_flags & SCF_BIDI))
2637                         goto out_invalid_cdb_field;
2638                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2639                 if (sector_ret)
2640                         goto out_unsupported_cdb;
2641                 size = transport_get_size(sectors, cdb, cmd);
2642                 cmd->t_task_lba = transport_lba_32(cdb);
2643                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2644
2645                 /*
2646                  * Do now allow BIDI commands for passthrough mode.
2647                  */
2648                 if (passthrough)
2649                         goto out_unsupported_cdb;
2650
2651                 /*
2652                  * Setup BIDI XOR callback to be run after I/O completion.
2653                  */
2654                 cmd->transport_complete_callback = &transport_xor_callback;
2655                 if (cdb[1] & 0x8)
2656                         cmd->se_cmd_flags |= SCF_FUA;
2657                 break;
2658         case VARIABLE_LENGTH_CMD:
2659                 service_action = get_unaligned_be16(&cdb[8]);
2660                 switch (service_action) {
2661                 case XDWRITEREAD_32:
2662                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2663                         if (sector_ret)
2664                                 goto out_unsupported_cdb;
2665                         size = transport_get_size(sectors, cdb, cmd);
2666                         /*
2667                          * Use WRITE_32 and READ_32 opcodes for the emulated
2668                          * XDWRITE_READ_32 logic.
2669                          */
2670                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2671                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2672
2673                         /*
2674                          * Do now allow BIDI commands for passthrough mode.
2675                          */
2676                         if (passthrough)
2677                                 goto out_unsupported_cdb;
2678
2679                         /*
2680                          * Setup BIDI XOR callback to be run during after I/O
2681                          * completion.
2682                          */
2683                         cmd->transport_complete_callback = &transport_xor_callback;
2684                         if (cdb[1] & 0x8)
2685                                 cmd->se_cmd_flags |= SCF_FUA;
2686                         break;
2687                 case WRITE_SAME_32:
2688                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2689                         if (sector_ret)
2690                                 goto out_unsupported_cdb;
2691
2692                         if (sectors)
2693                                 size = transport_get_size(1, cdb, cmd);
2694                         else {
2695                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2696                                        " supported\n");
2697                                 goto out_invalid_cdb_field;
2698                         }
2699
2700                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2701                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2702
2703                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2704                                 goto out_invalid_cdb_field;
2705                         if (!passthrough)
2706                                 cmd->execute_task = target_emulate_write_same;
2707                         break;
2708                 default:
2709                         pr_err("VARIABLE_LENGTH_CMD service action"
2710                                 " 0x%04x not supported\n", service_action);
2711                         goto out_unsupported_cdb;
2712                 }
2713                 break;
2714         case MAINTENANCE_IN:
2715                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2716                         /* MAINTENANCE_IN from SCC-2 */
2717                         /*
2718                          * Check for emulated MI_REPORT_TARGET_PGS.
2719                          */
2720                         if (cdb[1] == MI_REPORT_TARGET_PGS &&
2721                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2722                                 cmd->execute_task =
2723                                         target_emulate_report_target_port_groups;
2724                         }
2725                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2726                                (cdb[8] << 8) | cdb[9];
2727                 } else {
2728                         /* GPCMD_SEND_KEY from multi media commands */
2729                         size = (cdb[8] << 8) + cdb[9];
2730                 }
2731                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2732                 break;
2733         case MODE_SELECT:
2734                 size = cdb[4];
2735                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2736                 break;
2737         case MODE_SELECT_10:
2738                 size = (cdb[7] << 8) + cdb[8];
2739                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2740                 break;
2741         case MODE_SENSE:
2742                 size = cdb[4];
2743                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2744                 if (!passthrough)
2745                         cmd->execute_task = target_emulate_modesense;
2746                 break;
2747         case MODE_SENSE_10:
2748                 size = (cdb[7] << 8) + cdb[8];
2749                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2750                 if (!passthrough)
2751                         cmd->execute_task = target_emulate_modesense;
2752                 break;
2753         case GPCMD_READ_BUFFER_CAPACITY:
2754         case GPCMD_SEND_OPC:
2755         case LOG_SELECT:
2756         case LOG_SENSE:
2757                 size = (cdb[7] << 8) + cdb[8];
2758                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2759                 break;
2760         case READ_BLOCK_LIMITS:
2761                 size = READ_BLOCK_LEN;
2762                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2763                 break;
2764         case GPCMD_GET_CONFIGURATION:
2765         case GPCMD_READ_FORMAT_CAPACITIES:
2766         case GPCMD_READ_DISC_INFO:
2767         case GPCMD_READ_TRACK_RZONE_INFO:
2768                 size = (cdb[7] << 8) + cdb[8];
2769                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2770                 break;
2771         case PERSISTENT_RESERVE_IN:
2772                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2773                         cmd->execute_task = target_scsi3_emulate_pr_in;
2774                 size = (cdb[7] << 8) + cdb[8];
2775                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2776                 break;
2777         case PERSISTENT_RESERVE_OUT:
2778                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2779                         cmd->execute_task = target_scsi3_emulate_pr_out;
2780                 size = (cdb[7] << 8) + cdb[8];
2781                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2782                 break;
2783         case GPCMD_MECHANISM_STATUS:
2784         case GPCMD_READ_DVD_STRUCTURE:
2785                 size = (cdb[8] << 8) + cdb[9];
2786                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2787                 break;
2788         case READ_POSITION:
2789                 size = READ_POSITION_LEN;
2790                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2791                 break;
2792         case MAINTENANCE_OUT:
2793                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2794                         /* MAINTENANCE_OUT from SCC-2
2795                          *
2796                          * Check for emulated MO_SET_TARGET_PGS.
2797                          */
2798                         if (cdb[1] == MO_SET_TARGET_PGS &&
2799                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2800                                 cmd->execute_task =
2801                                         target_emulate_set_target_port_groups;
2802                         }
2803
2804                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2805                                (cdb[8] << 8) | cdb[9];
2806                 } else  {
2807                         /* GPCMD_REPORT_KEY from multi media commands */
2808                         size = (cdb[8] << 8) + cdb[9];
2809                 }
2810                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2811                 break;
2812         case INQUIRY:
2813                 size = (cdb[3] << 8) + cdb[4];
2814                 /*
2815                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2816                  * See spc4r17 section 5.3
2817                  */
2818                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2819                         cmd->sam_task_attr = MSG_HEAD_TAG;
2820                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2821                 if (!passthrough)
2822                         cmd->execute_task = target_emulate_inquiry;
2823                 break;
2824         case READ_BUFFER:
2825                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2826                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2827                 break;
2828         case READ_CAPACITY:
2829                 size = READ_CAP_LEN;
2830                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2831                 if (!passthrough)
2832                         cmd->execute_task = target_emulate_readcapacity;
2833                 break;
2834         case READ_MEDIA_SERIAL_NUMBER:
2835         case SECURITY_PROTOCOL_IN:
2836         case SECURITY_PROTOCOL_OUT:
2837                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2838                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2839                 break;
2840         case SERVICE_ACTION_IN:
2841                 switch (cmd->t_task_cdb[1] & 0x1f) {
2842                 case SAI_READ_CAPACITY_16:
2843                         if (!passthrough)
2844                                 cmd->execute_task =
2845                                         target_emulate_readcapacity_16;
2846                         break;
2847                 default:
2848                         if (passthrough)
2849                                 break;
2850
2851                         pr_err("Unsupported SA: 0x%02x\n",
2852                                 cmd->t_task_cdb[1] & 0x1f);
2853                         goto out_unsupported_cdb;
2854                 }
2855                 /*FALLTHROUGH*/
2856         case ACCESS_CONTROL_IN:
2857         case ACCESS_CONTROL_OUT:
2858         case EXTENDED_COPY:
2859         case READ_ATTRIBUTE:
2860         case RECEIVE_COPY_RESULTS:
2861         case WRITE_ATTRIBUTE:
2862                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2863                        (cdb[12] << 8) | cdb[13];
2864                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2865                 break;
2866         case RECEIVE_DIAGNOSTIC:
2867         case SEND_DIAGNOSTIC:
2868                 size = (cdb[3] << 8) | cdb[4];
2869                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2870                 break;
2871 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2872 #if 0
2873         case GPCMD_READ_CD:
2874                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2875                 size = (2336 * sectors);
2876                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2877                 break;
2878 #endif
2879         case READ_TOC:
2880                 size = cdb[8];
2881                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2882                 break;
2883         case REQUEST_SENSE:
2884                 size = cdb[4];
2885                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2886                 if (!passthrough)
2887                         cmd->execute_task = target_emulate_request_sense;
2888                 break;
2889         case READ_ELEMENT_STATUS:
2890                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2891                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2892                 break;
2893         case WRITE_BUFFER:
2894                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2895                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2896                 break;
2897         case RESERVE:
2898         case RESERVE_10:
2899                 /*
2900                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2901                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2902                  */
2903                 if (cdb[0] == RESERVE_10)
2904                         size = (cdb[7] << 8) | cdb[8];
2905                 else
2906                         size = cmd->data_length;
2907
2908                 /*
2909                  * Setup the legacy emulated handler for SPC-2 and
2910                  * >= SPC-3 compatible reservation handling (CRH=1)
2911                  * Otherwise, we assume the underlying SCSI logic is
2912                  * is running in SPC_PASSTHROUGH, and wants reservations
2913                  * emulation disabled.
2914                  */
2915                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2916                         cmd->execute_task = target_scsi2_reservation_reserve;
2917                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2918                 break;
2919         case RELEASE:
2920         case RELEASE_10:
2921                 /*
2922                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2923                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2924                 */
2925                 if (cdb[0] == RELEASE_10)
2926                         size = (cdb[7] << 8) | cdb[8];
2927                 else
2928                         size = cmd->data_length;
2929
2930                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2931                         cmd->execute_task = target_scsi2_reservation_release;
2932                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2933                 break;
2934         case SYNCHRONIZE_CACHE:
2935         case 0x91: /* SYNCHRONIZE_CACHE_16: */
2936                 /*
2937                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2938                  */
2939                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2940                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2941                         cmd->t_task_lba = transport_lba_32(cdb);
2942                 } else {
2943                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2944                         cmd->t_task_lba = transport_lba_64(cdb);
2945                 }
2946                 if (sector_ret)
2947                         goto out_unsupported_cdb;
2948
2949                 size = transport_get_size(sectors, cdb, cmd);
2950                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2951
2952                 if (passthrough)
2953                         break;
2954
2955                 /*
2956                  * Check to ensure that LBA + Range does not exceed past end of
2957                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2958                  */
2959                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2960                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2961                                 goto out_invalid_cdb_field;
2962                 }
2963                 cmd->execute_task = target_emulate_synchronize_cache;
2964                 break;
2965         case UNMAP:
2966                 size = get_unaligned_be16(&cdb[7]);
2967                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2968                 if (!passthrough)
2969                         cmd->execute_task = target_emulate_unmap;
2970                 break;
2971         case WRITE_SAME_16:
2972                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2973                 if (sector_ret)
2974                         goto out_unsupported_cdb;
2975
2976                 if (sectors)
2977                         size = transport_get_size(1, cdb, cmd);
2978                 else {
2979                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2980                         goto out_invalid_cdb_field;
2981                 }
2982
2983                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2984                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2985
2986                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2987                         goto out_invalid_cdb_field;
2988                 if (!passthrough)
2989                         cmd->execute_task = target_emulate_write_same;
2990                 break;
2991         case WRITE_SAME:
2992                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2993                 if (sector_ret)
2994                         goto out_unsupported_cdb;
2995
2996                 if (sectors)
2997                         size = transport_get_size(1, cdb, cmd);
2998                 else {
2999                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3000                         goto out_invalid_cdb_field;
3001                 }
3002
3003                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3004                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3005                 /*
3006                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3007                  * of byte 1 bit 3 UNMAP instead of original reserved field
3008                  */
3009                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3010                         goto out_invalid_cdb_field;
3011                 if (!passthrough)
3012                         cmd->execute_task = target_emulate_write_same;
3013                 break;
3014         case ALLOW_MEDIUM_REMOVAL:
3015         case ERASE:
3016         case REZERO_UNIT:
3017         case SEEK_10:
3018         case SPACE:
3019         case START_STOP:
3020         case TEST_UNIT_READY:
3021         case VERIFY:
3022         case WRITE_FILEMARKS:
3023                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3024                 if (!passthrough)
3025                         cmd->execute_task = target_emulate_noop;
3026                 break;
3027         case GPCMD_CLOSE_TRACK:
3028         case INITIALIZE_ELEMENT_STATUS:
3029         case GPCMD_LOAD_UNLOAD:
3030         case GPCMD_SET_SPEED:
3031         case MOVE_MEDIUM:
3032                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3033                 break;
3034         case REPORT_LUNS:
3035                 cmd->execute_task = target_report_luns;
3036                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3037                 /*
3038                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3039                  * See spc4r17 section 5.3
3040                  */
3041                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3042                         cmd->sam_task_attr = MSG_HEAD_TAG;
3043                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3044                 break;
3045         default:
3046                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3047                         " 0x%02x, sending CHECK_CONDITION.\n",
3048                         cmd->se_tfo->get_fabric_name(), cdb[0]);
3049                 goto out_unsupported_cdb;
3050         }
3051
3052         if (size != cmd->data_length) {
3053                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3054                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3055                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3056                                 cmd->data_length, size, cdb[0]);
3057
3058                 cmd->cmd_spdtl = size;
3059
3060                 if (cmd->data_direction == DMA_TO_DEVICE) {
3061                         pr_err("Rejecting underflow/overflow"
3062                                         " WRITE data\n");
3063                         goto out_invalid_cdb_field;
3064                 }
3065                 /*
3066                  * Reject READ_* or WRITE_* with overflow/underflow for
3067                  * type SCF_SCSI_DATA_SG_IO_CDB.
3068                  */
3069                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
3070                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3071                                 " CDB on non 512-byte sector setup subsystem"
3072                                 " plugin: %s\n", dev->transport->name);
3073                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3074                         goto out_invalid_cdb_field;
3075                 }
3076
3077                 if (size > cmd->data_length) {
3078                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3079                         cmd->residual_count = (size - cmd->data_length);
3080                 } else {
3081                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3082                         cmd->residual_count = (cmd->data_length - size);
3083                 }
3084                 cmd->data_length = size;
3085         }
3086
3087         /* reject any command that we don't have a handler for */
3088         if (!(passthrough || cmd->execute_task ||
3089              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3090                 goto out_unsupported_cdb;
3091
3092         /* Let's limit control cdbs to a page, for simplicity's sake. */
3093         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3094             size > PAGE_SIZE)
3095                 goto out_invalid_cdb_field;
3096
3097         transport_set_supported_SAM_opcode(cmd);
3098         return ret;
3099
3100 out_unsupported_cdb:
3101         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3102         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3103         return -EINVAL;
3104 out_invalid_cdb_field:
3105         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3106         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3107         return -EINVAL;
3108 }
3109
3110 /*
3111  * Called from I/O completion to determine which dormant/delayed
3112  * and ordered cmds need to have their tasks added to the execution queue.
3113  */
3114 static void transport_complete_task_attr(struct se_cmd *cmd)
3115 {
3116         struct se_device *dev = cmd->se_dev;
3117         struct se_cmd *cmd_p, *cmd_tmp;
3118         int new_active_tasks = 0;
3119
3120         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3121                 atomic_dec(&dev->simple_cmds);
3122                 smp_mb__after_atomic_dec();
3123                 dev->dev_cur_ordered_id++;
3124                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3125                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3126                         cmd->se_ordered_id);
3127         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3128                 dev->dev_cur_ordered_id++;
3129                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3130                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3131                         cmd->se_ordered_id);
3132         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3133                 atomic_dec(&dev->dev_ordered_sync);
3134                 smp_mb__after_atomic_dec();
3135
3136                 dev->dev_cur_ordered_id++;
3137                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3138                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3139         }
3140         /*
3141          * Process all commands up to the last received
3142          * ORDERED task attribute which requires another blocking
3143          * boundary
3144          */
3145         spin_lock(&dev->delayed_cmd_lock);
3146         list_for_each_entry_safe(cmd_p, cmd_tmp,
3147                         &dev->delayed_cmd_list, se_delayed_node) {
3148
3149                 list_del(&cmd_p->se_delayed_node);
3150                 spin_unlock(&dev->delayed_cmd_lock);
3151
3152                 pr_debug("Calling add_tasks() for"
3153                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3154                         " Dormant -> Active, se_ordered_id: %u\n",
3155                         cmd_p->t_task_cdb[0],
3156                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3157
3158                 transport_add_tasks_from_cmd(cmd_p);
3159                 new_active_tasks++;
3160
3161                 spin_lock(&dev->delayed_cmd_lock);
3162                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3163                         break;
3164         }
3165         spin_unlock(&dev->delayed_cmd_lock);
3166         /*
3167          * If new tasks have become active, wake up the transport thread
3168          * to do the processing of the Active tasks.
3169          */
3170         if (new_active_tasks != 0)
3171                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3172 }
3173
3174 static void transport_complete_qf(struct se_cmd *cmd)
3175 {
3176         int ret = 0;
3177
3178         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3179                 transport_complete_task_attr(cmd);
3180
3181         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3182                 ret = cmd->se_tfo->queue_status(cmd);
3183                 if (ret)
3184                         goto out;
3185         }
3186
3187         switch (cmd->data_direction) {
3188         case DMA_FROM_DEVICE:
3189                 ret = cmd->se_tfo->queue_data_in(cmd);
3190                 break;
3191         case DMA_TO_DEVICE:
3192                 if (cmd->t_bidi_data_sg) {
3193                         ret = cmd->se_tfo->queue_data_in(cmd);
3194                         if (ret < 0)
3195                                 break;
3196                 }
3197                 /* Fall through for DMA_TO_DEVICE */
3198         case DMA_NONE:
3199                 ret = cmd->se_tfo->queue_status(cmd);
3200                 break;
3201         default:
3202                 break;
3203         }
3204
3205 out:
3206         if (ret < 0) {
3207                 transport_handle_queue_full(cmd, cmd->se_dev);
3208                 return;
3209         }
3210         transport_lun_remove_cmd(cmd);
3211         transport_cmd_check_stop_to_fabric(cmd);
3212 }
3213
3214 static void transport_handle_queue_full(
3215         struct se_cmd *cmd,
3216         struct se_device *dev)
3217 {
3218         spin_lock_irq(&dev->qf_cmd_lock);
3219         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3220         atomic_inc(&dev->dev_qf_count);
3221         smp_mb__after_atomic_inc();
3222         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3223
3224         schedule_work(&cmd->se_dev->qf_work_queue);
3225 }
3226
3227 static void target_complete_ok_work(struct work_struct *work)
3228 {
3229         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3230         int reason = 0, ret;
3231
3232         /*
3233          * Check if we need to move delayed/dormant tasks from cmds on the
3234          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3235          * Attribute.
3236          */
3237         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3238                 transport_complete_task_attr(cmd);
3239         /*
3240          * Check to schedule QUEUE_FULL work, or execute an existing
3241          * cmd->transport_qf_callback()
3242          */
3243         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3244                 schedule_work(&cmd->se_dev->qf_work_queue);
3245
3246         /*
3247          * Check if we need to retrieve a sense buffer from
3248          * the struct se_cmd in question.
3249          */
3250         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3251                 if (transport_get_sense_data(cmd) < 0)
3252                         reason = TCM_NON_EXISTENT_LUN;
3253
3254                 /*
3255                  * Only set when an struct se_task->task_scsi_status returned
3256                  * a non GOOD status.
3257                  */
3258                 if (cmd->scsi_status) {
3259                         ret = transport_send_check_condition_and_sense(
3260                                         cmd, reason, 1);
3261                         if (ret == -EAGAIN || ret == -ENOMEM)
3262                                 goto queue_full;
3263
3264                         transport_lun_remove_cmd(cmd);
3265                         transport_cmd_check_stop_to_fabric(cmd);
3266                         return;
3267                 }
3268         }
3269         /*
3270          * Check for a callback, used by amongst other things
3271          * XDWRITE_READ_10 emulation.
3272          */
3273         if (cmd->transport_complete_callback)
3274                 cmd->transport_complete_callback(cmd);
3275
3276         switch (cmd->data_direction) {
3277         case DMA_FROM_DEVICE:
3278                 spin_lock(&cmd->se_lun->lun_sep_lock);
3279                 if (cmd->se_lun->lun_sep) {
3280                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3281                                         cmd->data_length;
3282                 }
3283                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3284
3285                 ret = cmd->se_tfo->queue_data_in(cmd);
3286                 if (ret == -EAGAIN || ret == -ENOMEM)
3287                         goto queue_full;
3288                 break;
3289         case DMA_TO_DEVICE:
3290                 spin_lock(&cmd->se_lun->lun_sep_lock);
3291                 if (cmd->se_lun->lun_sep) {
3292                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3293                                 cmd->data_length;
3294                 }
3295                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3296                 /*
3297                  * Check if we need to send READ payload for BIDI-COMMAND
3298                  */
3299                 if (cmd->t_bidi_data_sg) {
3300                         spin_lock(&cmd->se_lun->lun_sep_lock);
3301                         if (cmd->se_lun->lun_sep) {
3302                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3303                                         cmd->data_length;
3304                         }
3305                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3306                         ret = cmd->se_tfo->queue_data_in(cmd);
3307                         if (ret == -EAGAIN || ret == -ENOMEM)
3308                                 goto queue_full;
3309                         break;
3310                 }
3311                 /* Fall through for DMA_TO_DEVICE */
3312         case DMA_NONE:
3313                 ret = cmd->se_tfo->queue_status(cmd);
3314                 if (ret == -EAGAIN || ret == -ENOMEM)
3315                         goto queue_full;
3316                 break;
3317         default:
3318                 break;
3319         }
3320
3321         transport_lun_remove_cmd(cmd);
3322         transport_cmd_check_stop_to_fabric(cmd);
3323         return;
3324
3325 queue_full:
3326         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3327                 " data_direction: %d\n", cmd, cmd->data_direction);
3328         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3329         transport_handle_queue_full(cmd, cmd->se_dev);
3330 }
3331
3332 static void transport_free_dev_tasks(struct se_cmd *cmd)
3333 {
3334         struct se_task *task, *task_tmp;
3335         unsigned long flags;
3336         LIST_HEAD(dispose_list);
3337
3338         spin_lock_irqsave(&cmd->t_state_lock, flags);
3339         list_for_each_entry_safe(task, task_tmp,
3340                                 &cmd->t_task_list, t_list) {
3341                 if (!(task->task_flags & TF_ACTIVE))
3342                         list_move_tail(&task->t_list, &dispose_list);
3343         }
3344         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3345
3346         while (!list_empty(&dispose_list)) {
3347                 task = list_first_entry(&dispose_list, struct se_task, t_list);
3348
3349                 if (task->task_sg != cmd->t_data_sg &&
3350                     task->task_sg != cmd->t_bidi_data_sg)
3351                         kfree(task->task_sg);
3352
3353                 list_del(&task->t_list);
3354
3355                 cmd->se_dev->transport->free_task(task);
3356         }
3357 }
3358
3359 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3360 {
3361         struct scatterlist *sg;
3362         int count;
3363
3364         for_each_sg(sgl, sg, nents, count)
3365                 __free_page(sg_page(sg));
3366
3367         kfree(sgl);
3368 }
3369
3370 static inline void transport_free_pages(struct se_cmd *cmd)
3371 {
3372         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3373                 return;
3374
3375         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3376         cmd->t_data_sg = NULL;
3377         cmd->t_data_nents = 0;
3378
3379         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3380         cmd->t_bidi_data_sg = NULL;
3381         cmd->t_bidi_data_nents = 0;
3382 }
3383
3384 /**
3385  * transport_release_cmd - free a command
3386  * @cmd:       command to free
3387  *
3388  * This routine unconditionally frees a command, and reference counting
3389  * or list removal must be done in the caller.
3390  */
3391 static void transport_release_cmd(struct se_cmd *cmd)
3392 {
3393         BUG_ON(!cmd->se_tfo);
3394
3395         if (cmd->se_tmr_req)
3396                 core_tmr_release_req(cmd->se_tmr_req);
3397         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3398                 kfree(cmd->t_task_cdb);
3399         /*
3400          * If this cmd has been setup with target_get_sess_cmd(), drop
3401          * the kref and call ->release_cmd() in kref callback.
3402          */
3403          if (cmd->check_release != 0) {
3404                 target_put_sess_cmd(cmd->se_sess, cmd);
3405                 return;
3406         }
3407         cmd->se_tfo->release_cmd(cmd);
3408 }
3409
3410 /**
3411  * transport_put_cmd - release a reference to a command
3412  * @cmd:       command to release
3413  *
3414  * This routine releases our reference to the command and frees it if possible.
3415  */
3416 static void transport_put_cmd(struct se_cmd *cmd)
3417 {
3418         unsigned long flags;
3419         int free_tasks = 0;
3420
3421         spin_lock_irqsave(&cmd->t_state_lock, flags);
3422         if (atomic_read(&cmd->t_fe_count)) {
3423                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3424                         goto out_busy;
3425         }
3426
3427         if (atomic_read(&cmd->t_se_count)) {
3428                 if (!atomic_dec_and_test(&cmd->t_se_count))
3429                         goto out_busy;
3430         }
3431
3432         if (atomic_read(&cmd->transport_dev_active)) {
3433                 atomic_set(&cmd->transport_dev_active, 0);
3434                 transport_all_task_dev_remove_state(cmd);
3435                 free_tasks = 1;
3436         }
3437         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3438
3439         if (free_tasks != 0)
3440                 transport_free_dev_tasks(cmd);
3441
3442         transport_free_pages(cmd);
3443         transport_release_cmd(cmd);
3444         return;
3445 out_busy:
3446         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3447 }
3448
3449 /*
3450  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3451  * allocating in the core.
3452  * @cmd:  Associated se_cmd descriptor
3453  * @mem:  SGL style memory for TCM WRITE / READ
3454  * @sg_mem_num: Number of SGL elements
3455  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3456  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3457  *
3458  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3459  * of parameters.
3460  */
3461 int transport_generic_map_mem_to_cmd(
3462         struct se_cmd *cmd,
3463         struct scatterlist *sgl,
3464         u32 sgl_count,
3465         struct scatterlist *sgl_bidi,
3466         u32 sgl_bidi_count)
3467 {
3468         if (!sgl || !sgl_count)
3469                 return 0;
3470
3471         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3472             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3473                 /*
3474                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3475                  * scatterlists already have been set to follow what the fabric
3476                  * passes for the original expected data transfer length.
3477                  */
3478                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3479                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3480                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3481                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3482                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3483                         return -EINVAL;
3484                 }
3485
3486                 cmd->t_data_sg = sgl;
3487                 cmd->t_data_nents = sgl_count;
3488
3489                 if (sgl_bidi && sgl_bidi_count) {
3490                         cmd->t_bidi_data_sg = sgl_bidi;
3491                         cmd->t_bidi_data_nents = sgl_bidi_count;
3492                 }
3493                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3494         }
3495
3496         return 0;
3497 }
3498 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3499
3500 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3501 {
3502         struct scatterlist *sg = cmd->t_data_sg;
3503
3504         BUG_ON(!sg);
3505         /*
3506          * We need to take into account a possible offset here for fabrics like
3507          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3508          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3509          */
3510         return kmap(sg_page(sg)) + sg->offset;
3511 }
3512 EXPORT_SYMBOL(transport_kmap_first_data_page);
3513
3514 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3515 {
3516         kunmap(sg_page(cmd->t_data_sg));
3517 }
3518 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3519
3520 static int
3521 transport_generic_get_mem(struct se_cmd *cmd)
3522 {
3523         u32 length = cmd->data_length;
3524         unsigned int nents;
3525         struct page *page;
3526         int i = 0;
3527
3528         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3529         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3530         if (!cmd->t_data_sg)
3531                 return -ENOMEM;
3532
3533         cmd->t_data_nents = nents;
3534         sg_init_table(cmd->t_data_sg, nents);
3535
3536         while (length) {
3537                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3538                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3539                 if (!page)
3540                         goto out;
3541
3542                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3543                 length -= page_len;
3544                 i++;
3545         }
3546         return 0;
3547
3548 out:
3549         while (i >= 0) {
3550                 __free_page(sg_page(&cmd->t_data_sg[i]));
3551                 i--;
3552         }
3553         kfree(cmd->t_data_sg);
3554         cmd->t_data_sg = NULL;
3555         return -ENOMEM;
3556 }
3557
3558 /* Reduce sectors if they are too long for the device */
3559 static inline sector_t transport_limit_task_sectors(
3560         struct se_device *dev,
3561         unsigned long long lba,
3562         sector_t sectors)
3563 {
3564         sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3565
3566         if (dev->transport->get_device_type(dev) == TYPE_DISK)
3567                 if ((lba + sectors) > transport_dev_end_lba(dev))
3568                         sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3569
3570         return sectors;
3571 }
3572
3573
3574 /*
3575  * This function can be used by HW target mode drivers to create a linked
3576  * scatterlist from all contiguously allocated struct se_task->task_sg[].
3577  * This is intended to be called during the completion path by TCM Core
3578  * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3579  */
3580 void transport_do_task_sg_chain(struct se_cmd *cmd)
3581 {
3582         struct scatterlist *sg_first = NULL;
3583         struct scatterlist *sg_prev = NULL;
3584         int sg_prev_nents = 0;
3585         struct scatterlist *sg;
3586         struct se_task *task;
3587         u32 chained_nents = 0;
3588         int i;
3589
3590         BUG_ON(!cmd->se_tfo->task_sg_chaining);
3591
3592         /*
3593          * Walk the struct se_task list and setup scatterlist chains
3594          * for each contiguously allocated struct se_task->task_sg[].
3595          */
3596         list_for_each_entry(task, &cmd->t_task_list, t_list) {
3597                 if (!task->task_sg)
3598                         continue;
3599
3600                 if (!sg_first) {
3601                         sg_first = task->task_sg;
3602                         chained_nents = task->task_sg_nents;
3603                 } else {
3604                         sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3605                         chained_nents += task->task_sg_nents;
3606                 }
3607                 /*
3608                  * For the padded tasks, use the extra SGL vector allocated
3609                  * in transport_allocate_data_tasks() for the sg_prev_nents
3610                  * offset into sg_chain() above.
3611                  *
3612                  * We do not need the padding for the last task (or a single
3613                  * task), but in that case we will never use the sg_prev_nents
3614                  * value below which would be incorrect.
3615                  */
3616                 sg_prev_nents = (task->task_sg_nents + 1);
3617                 sg_prev = task->task_sg;
3618         }
3619         /*
3620          * Setup the starting pointer and total t_tasks_sg_linked_no including
3621          * padding SGs for linking and to mark the end.
3622          */
3623         cmd->t_tasks_sg_chained = sg_first;
3624         cmd->t_tasks_sg_chained_no = chained_nents;
3625
3626         pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3627                 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3628                 cmd->t_tasks_sg_chained_no);
3629
3630         for_each_sg(cmd->t_tasks_sg_chained, sg,
3631                         cmd->t_tasks_sg_chained_no, i) {
3632
3633                 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3634                         i, sg, sg_page(sg), sg->length, sg->offset);
3635                 if (sg_is_chain(sg))
3636                         pr_debug("SG: %p sg_is_chain=1\n", sg);
3637                 if (sg_is_last(sg))
3638                         pr_debug("SG: %p sg_is_last=1\n", sg);
3639         }
3640 }
3641 EXPORT_SYMBOL(transport_do_task_sg_chain);
3642
3643 /*
3644  * Break up cmd into chunks transport can handle
3645  */
3646 static int
3647 transport_allocate_data_tasks(struct se_cmd *cmd,
3648         enum dma_data_direction data_direction,
3649         struct scatterlist *cmd_sg, unsigned int sgl_nents)
3650 {
3651         struct se_device *dev = cmd->se_dev;
3652         int task_count, i;
3653         unsigned long long lba;
3654         sector_t sectors, dev_max_sectors;
3655         u32 sector_size;
3656
3657         if (transport_cmd_get_valid_sectors(cmd) < 0)
3658                 return -EINVAL;
3659
3660         dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3661         sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3662
3663         WARN_ON(cmd->data_length % sector_size);
3664
3665         lba = cmd->t_task_lba;
3666         sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3667         task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3668
3669         /*
3670          * If we need just a single task reuse the SG list in the command
3671          * and avoid a lot of work.
3672          */
3673         if (task_count == 1) {
3674                 struct se_task *task;
3675                 unsigned long flags;
3676
3677                 task = transport_generic_get_task(cmd, data_direction);
3678                 if (!task)
3679                         return -ENOMEM;
3680
3681                 task->task_sg = cmd_sg;
3682                 task->task_sg_nents = sgl_nents;
3683
3684                 task->task_lba = lba;
3685                 task->task_sectors = sectors;
3686                 task->task_size = task->task_sectors * sector_size;
3687
3688                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3689                 list_add_tail(&task->t_list, &cmd->t_task_list);
3690                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3691
3692                 return task_count;
3693         }
3694
3695         for (i = 0; i < task_count; i++) {
3696                 struct se_task *task;
3697                 unsigned int task_size, task_sg_nents_padded;
3698                 struct scatterlist *sg;
3699                 unsigned long flags;
3700                 int count;
3701
3702                 task = transport_generic_get_task(cmd, data_direction);
3703                 if (!task)
3704                         return -ENOMEM;
3705
3706                 task->task_lba = lba;
3707                 task->task_sectors = min(sectors, dev_max_sectors);
3708                 task->task_size = task->task_sectors * sector_size;
3709
3710                 /*
3711                  * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3712                  * in order to calculate the number per task SGL entries
3713                  */
3714                 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3715                 /*
3716                  * Check if the fabric module driver is requesting that all
3717                  * struct se_task->task_sg[] be chained together..  If so,
3718                  * then allocate an extra padding SG entry for linking and
3719                  * marking the end of the chained SGL for every task except
3720                  * the last one for (task_count > 1) operation, or skipping
3721                  * the extra padding for the (task_count == 1) case.
3722                  */
3723                 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3724                         task_sg_nents_padded = (task->task_sg_nents + 1);
3725                 } else
3726                         task_sg_nents_padded = task->task_sg_nents;
3727
3728                 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3729                                         task_sg_nents_padded, GFP_KERNEL);
3730                 if (!task->task_sg) {
3731                         cmd->se_dev->transport->free_task(task);
3732                         return -ENOMEM;
3733                 }
3734
3735                 sg_init_table(task->task_sg, task_sg_nents_padded);
3736
3737                 task_size = task->task_size;
3738
3739                 /* Build new sgl, only up to task_size */
3740                 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3741                         if (cmd_sg->length > task_size)
3742                                 break;
3743
3744                         *sg = *cmd_sg;
3745                         task_size -= cmd_sg->length;
3746                         cmd_sg = sg_next(cmd_sg);
3747                 }
3748
3749                 lba += task->task_sectors;
3750                 sectors -= task->task_sectors;
3751
3752                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3753                 list_add_tail(&task->t_list, &cmd->t_task_list);
3754                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3755         }
3756
3757         return task_count;
3758 }
3759
3760 static int
3761 transport_allocate_control_task(struct se_cmd *cmd)
3762 {
3763         struct se_task *task;
3764         unsigned long flags;
3765
3766         task = transport_generic_get_task(cmd, cmd->data_direction);
3767         if (!task)
3768                 return -ENOMEM;
3769
3770         task->task_sg = cmd->t_data_sg;
3771         task->task_size = cmd->data_length;
3772         task->task_sg_nents = cmd->t_data_nents;
3773
3774         spin_lock_irqsave(&cmd->t_state_lock, flags);
3775         list_add_tail(&task->t_list, &cmd->t_task_list);
3776         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3777
3778         /* Success! Return number of tasks allocated */
3779         return 1;
3780 }
3781
3782 /*
3783  * Allocate any required ressources to execute the command, and either place
3784  * it on the execution queue if possible.  For writes we might not have the
3785  * payload yet, thus notify the fabric via a call to ->write_pending instead.
3786  */
3787 int transport_generic_new_cmd(struct se_cmd *cmd)
3788 {
3789         struct se_device *dev = cmd->se_dev;
3790         int task_cdbs, task_cdbs_bidi = 0;
3791         int set_counts = 1;
3792         int ret = 0;
3793
3794         /*
3795          * Determine is the TCM fabric module has already allocated physical
3796          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3797          * beforehand.
3798          */
3799         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3800             cmd->data_length) {
3801                 ret = transport_generic_get_mem(cmd);
3802                 if (ret < 0)
3803                         goto out_fail;
3804         }
3805
3806         /*
3807          * For BIDI command set up the read tasks first.
3808          */
3809         if (cmd->t_bidi_data_sg &&
3810             dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3811                 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3812
3813                 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3814                                 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3815                                 cmd->t_bidi_data_nents);
3816                 if (task_cdbs_bidi <= 0)
3817                         goto out_fail;
3818
3819                 atomic_inc(&cmd->t_fe_count);
3820                 atomic_inc(&cmd->t_se_count);
3821                 set_counts = 0;
3822         }
3823
3824         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3825                 task_cdbs = transport_allocate_data_tasks(cmd,
3826                                         cmd->data_direction, cmd->t_data_sg,
3827                                         cmd->t_data_nents);
3828         } else {
3829                 task_cdbs = transport_allocate_control_task(cmd);
3830         }
3831
3832         if (task_cdbs < 0)
3833                 goto out_fail;
3834         else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3835                 cmd->t_state = TRANSPORT_COMPLETE;
3836                 atomic_set(&cmd->t_transport_active, 1);
3837                 INIT_WORK(&cmd->work, target_complete_ok_work);
3838                 queue_work(target_completion_wq, &cmd->work);
3839                 return 0;
3840         }
3841
3842         if (set_counts) {
3843                 atomic_inc(&cmd->t_fe_count);
3844                 atomic_inc(&cmd->t_se_count);
3845         }
3846
3847         cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3848         atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3849         atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3850
3851         /*
3852          * For WRITEs, let the fabric know its buffer is ready..
3853          * This WRITE struct se_cmd (and all of its associated struct se_task's)
3854          * will be added to the struct se_device execution queue after its WRITE
3855          * data has arrived. (ie: It gets handled by the transport processing
3856          * thread a second time)
3857          */
3858         if (cmd->data_direction == DMA_TO_DEVICE) {
3859                 transport_add_tasks_to_state_queue(cmd);
3860                 return transport_generic_write_pending(cmd);
3861         }
3862         /*
3863          * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3864          * to the execution queue.
3865          */
3866         transport_execute_tasks(cmd);
3867         return 0;
3868
3869 out_fail:
3870         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3871         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3872         return -EINVAL;
3873 }
3874 EXPORT_SYMBOL(transport_generic_new_cmd);
3875
3876 /*      transport_generic_process_write():
3877  *
3878  *
3879  */
3880 void transport_generic_process_write(struct se_cmd *cmd)
3881 {
3882         transport_execute_tasks(cmd);
3883 }
3884 EXPORT_SYMBOL(transport_generic_process_write);
3885
3886 static void transport_write_pending_qf(struct se_cmd *cmd)
3887 {
3888         int ret;
3889
3890         ret = cmd->se_tfo->write_pending(cmd);
3891         if (ret == -EAGAIN || ret == -ENOMEM) {
3892                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3893                          cmd);
3894                 transport_handle_queue_full(cmd, cmd->se_dev);
3895         }
3896 }
3897
3898 static int transport_generic_write_pending(struct se_cmd *cmd)
3899 {
3900         unsigned long flags;
3901         int ret;
3902
3903         spin_lock_irqsave(&cmd->t_state_lock, flags);
3904         cmd->t_state = TRANSPORT_WRITE_PENDING;
3905         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3906
3907         /*
3908          * Clear the se_cmd for WRITE_PENDING status in order to set
3909          * cmd->t_transport_active=0 so that transport_generic_handle_data
3910          * can be called from HW target mode interrupt code.  This is safe
3911          * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3912          * because the se_cmd->se_lun pointer is not being cleared.
3913          */
3914         transport_cmd_check_stop(cmd, 1, 0);
3915
3916         /*
3917          * Call the fabric write_pending function here to let the
3918          * frontend know that WRITE buffers are ready.
3919          */
3920         ret = cmd->se_tfo->write_pending(cmd);
3921         if (ret == -EAGAIN || ret == -ENOMEM)
3922                 goto queue_full;
3923         else if (ret < 0)
3924                 return ret;
3925
3926         return 1;
3927
3928 queue_full:
3929         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3930         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3931         transport_handle_queue_full(cmd, cmd->se_dev);
3932         return 0;
3933 }
3934
3935 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3936 {
3937         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3938                 if (wait_for_tasks && cmd->se_tmr_req)
3939                          transport_wait_for_tasks(cmd);
3940
3941                 transport_release_cmd(cmd);
3942         } else {
3943                 if (wait_for_tasks)
3944                         transport_wait_for_tasks(cmd);
3945
3946                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3947
3948                 if (cmd->se_lun)
3949                         transport_lun_remove_cmd(cmd);
3950
3951                 transport_free_dev_tasks(cmd);
3952
3953                 transport_put_cmd(cmd);
3954         }
3955 }
3956 EXPORT_SYMBOL(transport_generic_free_cmd);
3957
3958 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3959  * @se_sess:    session to reference
3960  * @se_cmd:     command descriptor to add
3961  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
3962  */
3963 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3964                         bool ack_kref)
3965 {
3966         unsigned long flags;
3967
3968         kref_init(&se_cmd->cmd_kref);
3969         /*
3970          * Add a second kref if the fabric caller is expecting to handle
3971          * fabric acknowledgement that requires two target_put_sess_cmd()
3972          * invocations before se_cmd descriptor release.
3973          */
3974         if (ack_kref == true)
3975                 kref_get(&se_cmd->cmd_kref);
3976
3977         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3978         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3979         se_cmd->check_release = 1;
3980         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3981 }
3982 EXPORT_SYMBOL(target_get_sess_cmd);
3983
3984 static void target_release_cmd_kref(struct kref *kref)
3985 {
3986         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3987         struct se_session *se_sess = se_cmd->se_sess;
3988         unsigned long flags;
3989
3990         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3991         if (list_empty(&se_cmd->se_cmd_list)) {
3992                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3993                 WARN_ON(1);
3994                 return;
3995         }
3996         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3997                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3998                 complete(&se_cmd->cmd_wait_comp);
3999                 return;
4000         }
4001         list_del(&se_cmd->se_cmd_list);
4002         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4003
4004         se_cmd->se_tfo->release_cmd(se_cmd);
4005 }
4006
4007 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4008  * @se_sess:    session to reference
4009  * @se_cmd:     command descriptor to drop
4010  */
4011 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4012 {
4013         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
4014 }
4015 EXPORT_SYMBOL(target_put_sess_cmd);
4016
4017 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4018  * @se_sess:    session to split
4019  */
4020 void target_splice_sess_cmd_list(struct se_session *se_sess)
4021 {
4022         struct se_cmd *se_cmd;
4023         unsigned long flags;
4024
4025         WARN_ON(!list_empty(&se_sess->sess_wait_list));
4026         INIT_LIST_HEAD(&se_sess->sess_wait_list);
4027
4028         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4029         se_sess->sess_tearing_down = 1;
4030
4031         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4032
4033         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4034                 se_cmd->cmd_wait_set = 1;
4035
4036         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4037 }
4038 EXPORT_SYMBOL(target_splice_sess_cmd_list);
4039
4040 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4041  * @se_sess:    session to wait for active I/O
4042  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
4043  */
4044 void target_wait_for_sess_cmds(
4045         struct se_session *se_sess,
4046         int wait_for_tasks)
4047 {
4048         struct se_cmd *se_cmd, *tmp_cmd;
4049         bool rc = false;
4050
4051         list_for_each_entry_safe(se_cmd, tmp_cmd,
4052                                 &se_sess->sess_wait_list, se_cmd_list) {
4053                 list_del(&se_cmd->se_cmd_list);
4054
4055                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4056                         " %d\n", se_cmd, se_cmd->t_state,
4057                         se_cmd->se_tfo->get_cmd_state(se_cmd));
4058
4059                 if (wait_for_tasks) {
4060                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4061                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4062                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4063
4064                         rc = transport_wait_for_tasks(se_cmd);
4065
4066                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4067                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4068                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4069                 }
4070
4071                 if (!rc) {
4072                         wait_for_completion(&se_cmd->cmd_wait_comp);
4073                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4074                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4075                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4076                 }
4077
4078                 se_cmd->se_tfo->release_cmd(se_cmd);
4079         }
4080 }
4081 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4082
4083 /*      transport_lun_wait_for_tasks():
4084  *
4085  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
4086  *      an struct se_lun to be successfully shutdown.
4087  */
4088 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4089 {
4090         unsigned long flags;
4091         int ret;
4092         /*
4093          * If the frontend has already requested this struct se_cmd to
4094          * be stopped, we can safely ignore this struct se_cmd.
4095          */
4096         spin_lock_irqsave(&cmd->t_state_lock, flags);
4097         if (atomic_read(&cmd->t_transport_stop)) {
4098                 atomic_set(&cmd->transport_lun_stop, 0);
4099                 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4100                         " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4101                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4102                 transport_cmd_check_stop(cmd, 1, 0);
4103                 return -EPERM;
4104         }
4105         atomic_set(&cmd->transport_lun_fe_stop, 1);
4106         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4107
4108         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4109
4110         ret = transport_stop_tasks_for_cmd(cmd);
4111
4112         pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4113                         " %d\n", cmd, cmd->t_task_list_num, ret);
4114         if (!ret) {
4115                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4116                                 cmd->se_tfo->get_task_tag(cmd));
4117                 wait_for_completion(&cmd->transport_lun_stop_comp);
4118                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4119                                 cmd->se_tfo->get_task_tag(cmd));
4120         }
4121         transport_remove_cmd_from_queue(cmd);
4122
4123         return 0;
4124 }
4125
4126 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4127 {
4128         struct se_cmd *cmd = NULL;
4129         unsigned long lun_flags, cmd_flags;
4130         /*
4131          * Do exception processing and return CHECK_CONDITION status to the
4132          * Initiator Port.
4133          */
4134         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4135         while (!list_empty(&lun->lun_cmd_list)) {
4136                 cmd = list_first_entry(&lun->lun_cmd_list,
4137                        struct se_cmd, se_lun_node);
4138                 list_del(&cmd->se_lun_node);
4139
4140                 atomic_set(&cmd->transport_lun_active, 0);
4141                 /*
4142                  * This will notify iscsi_target_transport.c:
4143                  * transport_cmd_check_stop() that a LUN shutdown is in
4144                  * progress for the iscsi_cmd_t.
4145                  */
4146                 spin_lock(&cmd->t_state_lock);
4147                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4148                         "_lun_stop for  ITT: 0x%08x\n",
4149                         cmd->se_lun->unpacked_lun,
4150                         cmd->se_tfo->get_task_tag(cmd));
4151                 atomic_set(&cmd->transport_lun_stop, 1);
4152                 spin_unlock(&cmd->t_state_lock);
4153
4154                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4155
4156                 if (!cmd->se_lun) {
4157                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4158                                 cmd->se_tfo->get_task_tag(cmd),
4159                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4160                         BUG();
4161                 }
4162                 /*
4163                  * If the Storage engine still owns the iscsi_cmd_t, determine
4164                  * and/or stop its context.
4165                  */
4166                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4167                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4168                         cmd->se_tfo->get_task_tag(cmd));
4169
4170                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4171                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4172                         continue;
4173                 }
4174
4175                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4176                         "_wait_for_tasks(): SUCCESS\n",
4177                         cmd->se_lun->unpacked_lun,
4178                         cmd->se_tfo->get_task_tag(cmd));
4179
4180                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4181                 if (!atomic_read(&cmd->transport_dev_active)) {
4182                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4183                         goto check_cond;
4184                 }
4185                 atomic_set(&cmd->transport_dev_active, 0);
4186                 transport_all_task_dev_remove_state(cmd);
4187                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4188
4189                 transport_free_dev_tasks(cmd);
4190                 /*
4191                  * The Storage engine stopped this struct se_cmd before it was
4192                  * send to the fabric frontend for delivery back to the
4193                  * Initiator Node.  Return this SCSI CDB back with an
4194                  * CHECK_CONDITION status.
4195                  */
4196 check_cond:
4197                 transport_send_check_condition_and_sense(cmd,
4198                                 TCM_NON_EXISTENT_LUN, 0);
4199                 /*
4200                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
4201                  * be released, notify the waiting thread now that LU has
4202                  * finished accessing it.
4203                  */
4204                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4205                 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4206                         pr_debug("SE_LUN[%d] - Detected FE stop for"
4207                                 " struct se_cmd: %p ITT: 0x%08x\n",
4208                                 lun->unpacked_lun,
4209                                 cmd, cmd->se_tfo->get_task_tag(cmd));
4210
4211                         spin_unlock_irqrestore(&cmd->t_state_lock,
4212                                         cmd_flags);
4213                         transport_cmd_check_stop(cmd, 1, 0);
4214                         complete(&cmd->transport_lun_fe_stop_comp);
4215                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4216                         continue;
4217                 }
4218                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4219                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4220
4221                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4222                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4223         }
4224         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4225 }
4226
4227 static int transport_clear_lun_thread(void *p)
4228 {
4229         struct se_lun *lun = p;
4230
4231         __transport_clear_lun_from_sessions(lun);
4232         complete(&lun->lun_shutdown_comp);
4233
4234         return 0;
4235 }
4236
4237 int transport_clear_lun_from_sessions(struct se_lun *lun)
4238 {
4239         struct task_struct *kt;
4240
4241         kt = kthread_run(transport_clear_lun_thread, lun,
4242                         "tcm_cl_%u", lun->unpacked_lun);
4243         if (IS_ERR(kt)) {
4244                 pr_err("Unable to start clear_lun thread\n");
4245                 return PTR_ERR(kt);
4246         }
4247         wait_for_completion(&lun->lun_shutdown_comp);
4248
4249         return 0;
4250 }
4251
4252 /**
4253  * transport_wait_for_tasks - wait for completion to occur
4254  * @cmd:        command to wait
4255  *
4256  * Called from frontend fabric context to wait for storage engine
4257  * to pause and/or release frontend generated struct se_cmd.
4258  */
4259 bool transport_wait_for_tasks(struct se_cmd *cmd)
4260 {
4261         unsigned long flags;
4262
4263         spin_lock_irqsave(&cmd->t_state_lock, flags);
4264         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4265                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4266                 return false;
4267         }
4268         /*
4269          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4270          * has been set in transport_set_supported_SAM_opcode().
4271          */
4272         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4273                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4274                 return false;
4275         }
4276         /*
4277          * If we are already stopped due to an external event (ie: LUN shutdown)
4278          * sleep until the connection can have the passed struct se_cmd back.
4279          * The cmd->transport_lun_stopped_sem will be upped by
4280          * transport_clear_lun_from_sessions() once the ConfigFS context caller
4281          * has completed its operation on the struct se_cmd.
4282          */
4283         if (atomic_read(&cmd->transport_lun_stop)) {
4284
4285                 pr_debug("wait_for_tasks: Stopping"
4286                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4287                         "_stop_comp); for ITT: 0x%08x\n",
4288                         cmd->se_tfo->get_task_tag(cmd));
4289                 /*
4290                  * There is a special case for WRITES where a FE exception +
4291                  * LUN shutdown means ConfigFS context is still sleeping on
4292                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4293                  * We go ahead and up transport_lun_stop_comp just to be sure
4294                  * here.
4295                  */
4296                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4297                 complete(&cmd->transport_lun_stop_comp);
4298                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4299                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4300
4301                 transport_all_task_dev_remove_state(cmd);
4302                 /*
4303                  * At this point, the frontend who was the originator of this
4304                  * struct se_cmd, now owns the structure and can be released through
4305                  * normal means below.
4306                  */
4307                 pr_debug("wait_for_tasks: Stopped"
4308                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4309                         "stop_comp); for ITT: 0x%08x\n",
4310                         cmd->se_tfo->get_task_tag(cmd));
4311
4312                 atomic_set(&cmd->transport_lun_stop, 0);
4313         }
4314         if (!atomic_read(&cmd->t_transport_active) ||
4315              atomic_read(&cmd->t_transport_aborted)) {
4316                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4317                 return false;
4318         }
4319
4320         atomic_set(&cmd->t_transport_stop, 1);
4321
4322         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4323                 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4324                 cmd, cmd->se_tfo->get_task_tag(cmd),
4325                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4326
4327         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4328
4329         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4330
4331         wait_for_completion(&cmd->t_transport_stop_comp);
4332
4333         spin_lock_irqsave(&cmd->t_state_lock, flags);
4334         atomic_set(&cmd->t_transport_active, 0);
4335         atomic_set(&cmd->t_transport_stop, 0);
4336
4337         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4338                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4339                 cmd->se_tfo->get_task_tag(cmd));
4340
4341         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4342
4343         return true;
4344 }
4345 EXPORT_SYMBOL(transport_wait_for_tasks);
4346
4347 static int transport_get_sense_codes(
4348         struct se_cmd *cmd,
4349         u8 *asc,
4350         u8 *ascq)
4351 {
4352         *asc = cmd->scsi_asc;
4353         *ascq = cmd->scsi_ascq;
4354
4355         return 0;
4356 }
4357
4358 static int transport_set_sense_codes(
4359         struct se_cmd *cmd,
4360         u8 asc,
4361         u8 ascq)
4362 {
4363         cmd->scsi_asc = asc;
4364         cmd->scsi_ascq = ascq;
4365
4366         return 0;
4367 }
4368
4369 int transport_send_check_condition_and_sense(
4370         struct se_cmd *cmd,
4371         u8 reason,
4372         int from_transport)
4373 {
4374         unsigned char *buffer = cmd->sense_buffer;
4375         unsigned long flags;
4376         int offset;
4377         u8 asc = 0, ascq = 0;
4378
4379         spin_lock_irqsave(&cmd->t_state_lock, flags);
4380         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4381                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4382                 return 0;
4383         }
4384         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4385         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4386
4387         if (!reason && from_transport)
4388                 goto after_reason;
4389
4390         if (!from_transport)
4391                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4392         /*
4393          * Data Segment and SenseLength of the fabric response PDU.
4394          *
4395          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4396          * from include/scsi/scsi_cmnd.h
4397          */
4398         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4399                                 TRANSPORT_SENSE_BUFFER);
4400         /*
4401          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4402          * SENSE KEY values from include/scsi/scsi.h
4403          */
4404         switch (reason) {
4405         case TCM_NON_EXISTENT_LUN:
4406                 /* CURRENT ERROR */
4407                 buffer[offset] = 0x70;
4408                 /* ILLEGAL REQUEST */
4409                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4410                 /* LOGICAL UNIT NOT SUPPORTED */
4411                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4412                 break;
4413         case TCM_UNSUPPORTED_SCSI_OPCODE:
4414         case TCM_SECTOR_COUNT_TOO_MANY:
4415                 /* CURRENT ERROR */
4416                 buffer[offset] = 0x70;
4417                 /* ILLEGAL REQUEST */
4418                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4419                 /* INVALID COMMAND OPERATION CODE */
4420                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4421                 break;
4422         case TCM_UNKNOWN_MODE_PAGE:
4423                 /* CURRENT ERROR */
4424                 buffer[offset] = 0x70;
4425                 /* ILLEGAL REQUEST */
4426                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4427                 /* INVALID FIELD IN CDB */
4428                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4429                 break;
4430         case TCM_CHECK_CONDITION_ABORT_CMD:
4431                 /* CURRENT ERROR */
4432                 buffer[offset] = 0x70;
4433                 /* ABORTED COMMAND */
4434                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4435                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4436                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4437                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4438                 break;
4439         case TCM_INCORRECT_AMOUNT_OF_DATA:
4440                 /* CURRENT ERROR */
4441                 buffer[offset] = 0x70;
4442                 /* ABORTED COMMAND */
4443                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4444                 /* WRITE ERROR */
4445                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4446                 /* NOT ENOUGH UNSOLICITED DATA */
4447                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4448                 break;
4449         case TCM_INVALID_CDB_FIELD:
4450                 /* CURRENT ERROR */
4451                 buffer[offset] = 0x70;
4452                 /* ABORTED COMMAND */
4453                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4454                 /* INVALID FIELD IN CDB */
4455                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4456                 break;
4457         case TCM_INVALID_PARAMETER_LIST:
4458                 /* CURRENT ERROR */
4459                 buffer[offset] = 0x70;
4460                 /* ABORTED COMMAND */
4461                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4462                 /* INVALID FIELD IN PARAMETER LIST */
4463                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4464                 break;
4465         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4466                 /* CURRENT ERROR */
4467                 buffer[offset] = 0x70;
4468                 /* ABORTED COMMAND */
4469                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4470                 /* WRITE ERROR */
4471                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4472                 /* UNEXPECTED_UNSOLICITED_DATA */
4473                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4474                 break;
4475         case TCM_SERVICE_CRC_ERROR:
4476                 /* CURRENT ERROR */
4477                 buffer[offset] = 0x70;
4478                 /* ABORTED COMMAND */
4479                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4480                 /* PROTOCOL SERVICE CRC ERROR */
4481                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4482                 /* N/A */
4483                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4484                 break;
4485         case TCM_SNACK_REJECTED:
4486                 /* CURRENT ERROR */
4487                 buffer[offset] = 0x70;
4488                 /* ABORTED COMMAND */
4489                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4490                 /* READ ERROR */
4491                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4492                 /* FAILED RETRANSMISSION REQUEST */
4493                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4494                 break;
4495         case TCM_WRITE_PROTECTED:
4496                 /* CURRENT ERROR */
4497                 buffer[offset] = 0x70;
4498                 /* DATA PROTECT */
4499                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4500                 /* WRITE PROTECTED */
4501                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4502                 break;
4503         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4504                 /* CURRENT ERROR */
4505                 buffer[offset] = 0x70;
4506                 /* UNIT ATTENTION */
4507                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4508                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4509                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4510                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4511                 break;
4512         case TCM_CHECK_CONDITION_NOT_READY:
4513                 /* CURRENT ERROR */
4514                 buffer[offset] = 0x70;
4515                 /* Not Ready */
4516                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4517                 transport_get_sense_codes(cmd, &asc, &ascq);
4518                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4519                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4520                 break;
4521         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4522         default:
4523                 /* CURRENT ERROR */
4524                 buffer[offset] = 0x70;
4525                 /* ILLEGAL REQUEST */
4526                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4527                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4528                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4529                 break;
4530         }
4531         /*
4532          * This code uses linux/include/scsi/scsi.h SAM status codes!
4533          */
4534         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4535         /*
4536          * Automatically padded, this value is encoded in the fabric's
4537          * data_length response PDU containing the SCSI defined sense data.
4538          */
4539         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4540
4541 after_reason:
4542         return cmd->se_tfo->queue_status(cmd);
4543 }
4544 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4545
4546 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4547 {
4548         int ret = 0;
4549
4550         if (atomic_read(&cmd->t_transport_aborted) != 0) {
4551                 if (!send_status ||
4552                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4553                         return 1;
4554 #if 0
4555                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4556                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4557                         cmd->t_task_cdb[0],
4558                         cmd->se_tfo->get_task_tag(cmd));
4559 #endif
4560                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4561                 cmd->se_tfo->queue_status(cmd);
4562                 ret = 1;
4563         }
4564         return ret;
4565 }
4566 EXPORT_SYMBOL(transport_check_aborted_status);
4567
4568 void transport_send_task_abort(struct se_cmd *cmd)
4569 {
4570         unsigned long flags;
4571
4572         spin_lock_irqsave(&cmd->t_state_lock, flags);
4573         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4574                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4575                 return;
4576         }
4577         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4578
4579         /*
4580          * If there are still expected incoming fabric WRITEs, we wait
4581          * until until they have completed before sending a TASK_ABORTED
4582          * response.  This response with TASK_ABORTED status will be
4583          * queued back to fabric module by transport_check_aborted_status().
4584          */
4585         if (cmd->data_direction == DMA_TO_DEVICE) {
4586                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4587                         atomic_inc(&cmd->t_transport_aborted);
4588                         smp_mb__after_atomic_inc();
4589                 }
4590         }
4591         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4592 #if 0
4593         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4594                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4595                 cmd->se_tfo->get_task_tag(cmd));
4596 #endif
4597         cmd->se_tfo->queue_status(cmd);
4598 }
4599
4600 static int transport_generic_do_tmr(struct se_cmd *cmd)
4601 {
4602         struct se_device *dev = cmd->se_dev;
4603         struct se_tmr_req *tmr = cmd->se_tmr_req;
4604         int ret;
4605
4606         switch (tmr->function) {
4607         case TMR_ABORT_TASK:
4608                 tmr->response = TMR_FUNCTION_REJECTED;
4609                 break;
4610         case TMR_ABORT_TASK_SET:
4611         case TMR_CLEAR_ACA:
4612         case TMR_CLEAR_TASK_SET:
4613                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4614                 break;
4615         case TMR_LUN_RESET:
4616                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4617                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4618                                          TMR_FUNCTION_REJECTED;
4619                 break;
4620         case TMR_TARGET_WARM_RESET:
4621                 tmr->response = TMR_FUNCTION_REJECTED;
4622                 break;
4623         case TMR_TARGET_COLD_RESET:
4624                 tmr->response = TMR_FUNCTION_REJECTED;
4625                 break;
4626         default:
4627                 pr_err("Uknown TMR function: 0x%02x.\n",
4628                                 tmr->function);
4629                 tmr->response = TMR_FUNCTION_REJECTED;
4630                 break;
4631         }
4632
4633         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4634         cmd->se_tfo->queue_tm_rsp(cmd);
4635
4636         transport_cmd_check_stop_to_fabric(cmd);
4637         return 0;
4638 }
4639
4640 /*      transport_processing_thread():
4641  *
4642  *
4643  */
4644 static int transport_processing_thread(void *param)
4645 {
4646         int ret;
4647         struct se_cmd *cmd;
4648         struct se_device *dev = param;
4649
4650         while (!kthread_should_stop()) {
4651                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4652                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4653                                 kthread_should_stop());
4654                 if (ret < 0)
4655                         goto out;
4656
4657 get_cmd:
4658                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4659                 if (!cmd)
4660                         continue;
4661
4662                 switch (cmd->t_state) {
4663                 case TRANSPORT_NEW_CMD:
4664                         BUG();
4665                         break;
4666                 case TRANSPORT_NEW_CMD_MAP:
4667                         if (!cmd->se_tfo->new_cmd_map) {
4668                                 pr_err("cmd->se_tfo->new_cmd_map is"
4669                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4670                                 BUG();
4671                         }
4672                         ret = cmd->se_tfo->new_cmd_map(cmd);
4673                         if (ret < 0) {
4674                                 transport_generic_request_failure(cmd);
4675                                 break;
4676                         }
4677                         ret = transport_generic_new_cmd(cmd);
4678                         if (ret < 0) {
4679                                 transport_generic_request_failure(cmd);
4680                                 break;
4681                         }
4682                         break;
4683                 case TRANSPORT_PROCESS_WRITE:
4684                         transport_generic_process_write(cmd);
4685                         break;
4686                 case TRANSPORT_PROCESS_TMR:
4687                         transport_generic_do_tmr(cmd);
4688                         break;
4689                 case TRANSPORT_COMPLETE_QF_WP:
4690                         transport_write_pending_qf(cmd);
4691                         break;
4692                 case TRANSPORT_COMPLETE_QF_OK:
4693                         transport_complete_qf(cmd);
4694                         break;
4695                 default:
4696                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4697                                 "i_state: %d on SE LUN: %u\n",
4698                                 cmd->t_state,
4699                                 cmd->se_tfo->get_task_tag(cmd),
4700                                 cmd->se_tfo->get_cmd_state(cmd),
4701                                 cmd->se_lun->unpacked_lun);
4702                         BUG();
4703                 }
4704
4705                 goto get_cmd;
4706         }
4707
4708 out:
4709         WARN_ON(!list_empty(&dev->state_task_list));
4710         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4711         dev->process_thread = NULL;
4712         return 0;
4713 }