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