projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
target: split transport_cmd_check_stop
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
015487b8 40#include <linux/ratelimit.h>
c66ac9db
NB		 41#include <asm/unaligned.h>
42#include <net/sock.h>
43#include <net/tcp.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_cmnd.h>
e66ecd50 46#include <scsi/scsi_tcq.h>
c66ac9db
NB		 47
48#include <target/target_core_base.h>
c4795fb2
CH		 49#include <target/target_core_backend.h>
50#include <target/target_core_fabric.h>
c66ac9db
NB		 51#include <target/target_core_configfs.h>
52
e26d99ae 53#include "target_core_internal.h"
c66ac9db 54#include "target_core_alua.h"
c66ac9db 55#include "target_core_pr.h"
c66ac9db
NB		 56#include "target_core_ua.h"
57
e3d6f909 58static int sub_api_initialized;
c66ac9db 59
35e0e757 60static struct workqueue_struct *target_completion_wq;
c66ac9db 61static struct kmem_cache *se_sess_cache;
c66ac9db 62struct kmem_cache *se_ua_cache;
c66ac9db
NB		 63struct kmem_cache *t10_pr_reg_cache;
64struct kmem_cache *t10_alua_lu_gp_cache;
65struct kmem_cache *t10_alua_lu_gp_mem_cache;
66struct kmem_cache *t10_alua_tg_pt_gp_cache;
67struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
c66ac9db 69static int transport_generic_write_pending(struct se_cmd *);
5951146d 70static int transport_processing_thread(void *param);
c66ac9db 71static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 72static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 73 struct se_device *dev);
05d1c7c0 74static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 75static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 76static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 77static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757 78static void target_complete_ok_work(struct work_struct *work);
c66ac9db 79
e3d6f909 80int init_se_kmem_caches(void)
c66ac9db 81{
c66ac9db
NB		 82 se_sess_cache = kmem_cache_create("se_sess_cache",
83 sizeof(struct se_session), __alignof__(struct se_session),
84 0, NULL);
6708bb27
AG		 85 if (!se_sess_cache) {
86 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 87 " failed\n");
c8e31f26 88 goto out;
c66ac9db
NB		 89 }
90 se_ua_cache = kmem_cache_create("se_ua_cache",
91 sizeof(struct se_ua), __alignof__(struct se_ua),
92 0, NULL);
6708bb27
AG		 93 if (!se_ua_cache) {
94 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 95 goto out_free_sess_cache;
c66ac9db 96 }
c66ac9db
NB		 97 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
98 sizeof(struct t10_pr_registration),
99 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 100 if (!t10_pr_reg_cache) {
101 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 102 " failed\n");
35e0e757 103 goto out_free_ua_cache;
c66ac9db
NB		 104 }
105 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
106 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
107 0, NULL);
6708bb27
AG		 108 if (!t10_alua_lu_gp_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 110 " failed\n");
35e0e757 111 goto out_free_pr_reg_cache;
c66ac9db
NB		 112 }
113 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
114 sizeof(struct t10_alua_lu_gp_member),
115 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 116 if (!t10_alua_lu_gp_mem_cache) {
117 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 118 "cache failed\n");
35e0e757 119 goto out_free_lu_gp_cache;
c66ac9db
NB		 120 }
121 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
122 sizeof(struct t10_alua_tg_pt_gp),
123 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 124 if (!t10_alua_tg_pt_gp_cache) {
125 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 126 "cache failed\n");
35e0e757 127 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 128 }
129 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
130 "t10_alua_tg_pt_gp_mem_cache",
131 sizeof(struct t10_alua_tg_pt_gp_member),
132 __alignof__(struct t10_alua_tg_pt_gp_member),
133 0, NULL);
6708bb27
AG		 134 if (!t10_alua_tg_pt_gp_mem_cache) {
135 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 136 "mem_t failed\n");
35e0e757 137 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 138 }
139
35e0e757
CH		 140 target_completion_wq = alloc_workqueue("target_completion",
141 WQ_MEM_RECLAIM, 0);
142 if (!target_completion_wq)
143 goto out_free_tg_pt_gp_mem_cache;
144
c66ac9db 145 return 0;
35e0e757
CH		 146
147out_free_tg_pt_gp_mem_cache:
148 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
149out_free_tg_pt_gp_cache:
150 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
151out_free_lu_gp_mem_cache:
152 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
153out_free_lu_gp_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_cache);
155out_free_pr_reg_cache:
156 kmem_cache_destroy(t10_pr_reg_cache);
157out_free_ua_cache:
158 kmem_cache_destroy(se_ua_cache);
159out_free_sess_cache:
160 kmem_cache_destroy(se_sess_cache);
c66ac9db 161out:
e3d6f909 162 return -ENOMEM;
c66ac9db
NB		 163}
164
e3d6f909 165void release_se_kmem_caches(void)
c66ac9db 166{
35e0e757 167 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 168 kmem_cache_destroy(se_sess_cache);
169 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 170 kmem_cache_destroy(t10_pr_reg_cache);
171 kmem_cache_destroy(t10_alua_lu_gp_cache);
172 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
173 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
174 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 175}
176
e3d6f909
AG		 177/* This code ensures unique mib indexes are handed out. */
178static DEFINE_SPINLOCK(scsi_mib_index_lock);
179static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 180
181/*
182 * Allocate a new row index for the entry type specified
183 */
184u32 scsi_get_new_index(scsi_index_t type)
185{
186 u32 new_index;
187
e3d6f909 188 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 189
e3d6f909
AG		 190 spin_lock(&scsi_mib_index_lock);
191 new_index = ++scsi_mib_index[type];
192 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 193
194 return new_index;
195}
196
e26d99ae 197static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 198{
199 atomic_set(&qobj->queue_cnt, 0);
200 INIT_LIST_HEAD(&qobj->qobj_list);
201 init_waitqueue_head(&qobj->thread_wq);
202 spin_lock_init(&qobj->cmd_queue_lock);
203}
c66ac9db 204
dbc5623e 205void transport_subsystem_check_init(void)
c66ac9db
NB		 206{
207 int ret;
208
dbc5623e
NB		 209 if (sub_api_initialized)
210 return;
211
c66ac9db
NB		 212 ret = request_module("target_core_iblock");
213 if (ret != 0)
6708bb27 214 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 215
216 ret = request_module("target_core_file");
217 if (ret != 0)
6708bb27 218 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 219
220 ret = request_module("target_core_pscsi");
221 if (ret != 0)
6708bb27 222 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 223
224 ret = request_module("target_core_stgt");
225 if (ret != 0)
6708bb27 226 pr_err("Unable to load target_core_stgt\n");
c66ac9db 227
e3d6f909 228 sub_api_initialized = 1;
dbc5623e 229 return;
c66ac9db
NB		 230}
231
232struct se_session *transport_init_session(void)
233{
234 struct se_session *se_sess;
235
236 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 237 if (!se_sess) {
238 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 239 " se_sess_cache\n");
240 return ERR_PTR(-ENOMEM);
241 }
242 INIT_LIST_HEAD(&se_sess->sess_list);
243 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 244 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
245 INIT_LIST_HEAD(&se_sess->sess_wait_list);
246 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 247 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 248
249 return se_sess;
250}
251EXPORT_SYMBOL(transport_init_session);
252
253/*
140854cb 254 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 255 */
256void __transport_register_session(
257 struct se_portal_group *se_tpg,
258 struct se_node_acl *se_nacl,
259 struct se_session *se_sess,
260 void *fabric_sess_ptr)
261{
262 unsigned char buf[PR_REG_ISID_LEN];
263
264 se_sess->se_tpg = se_tpg;
265 se_sess->fabric_sess_ptr = fabric_sess_ptr;
266 /*
267 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
268 *
269 * Only set for struct se_session's that will actually be moving I/O.
270 * eg: *NOT* discovery sessions.
271 */
272 if (se_nacl) {
273 /*
274 * If the fabric module supports an ISID based TransportID,
275 * save this value in binary from the fabric I_T Nexus now.
276 */
e3d6f909 277 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 278 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 279 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 280 &buf[0], PR_REG_ISID_LEN);
281 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
282 }
afb999ff
NB		 283 kref_get(&se_nacl->acl_kref);
284
c66ac9db
NB		 285 spin_lock_irq(&se_nacl->nacl_sess_lock);
286 /*
287 * The se_nacl->nacl_sess pointer will be set to the
288 * last active I_T Nexus for each struct se_node_acl.
289 */
290 se_nacl->nacl_sess = se_sess;
291
292 list_add_tail(&se_sess->sess_acl_list,
293 &se_nacl->acl_sess_list);
294 spin_unlock_irq(&se_nacl->nacl_sess_lock);
295 }
296 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
297
6708bb27 298 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 299 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 300}
301EXPORT_SYMBOL(__transport_register_session);
302
303void transport_register_session(
304 struct se_portal_group *se_tpg,
305 struct se_node_acl *se_nacl,
306 struct se_session *se_sess,
307 void *fabric_sess_ptr)
308{
140854cb
NB		 309 unsigned long flags;
310
311 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 312 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 313 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 314}
315EXPORT_SYMBOL(transport_register_session);
316
4149268e 317void target_release_session(struct kref *kref)
41ac82b6
NB		 318{
319 struct se_session *se_sess = container_of(kref,
320 struct se_session, sess_kref);
321 struct se_portal_group *se_tpg = se_sess->se_tpg;
322
323 se_tpg->se_tpg_tfo->close_session(se_sess);
324}
325
326void target_get_session(struct se_session *se_sess)
327{
328 kref_get(&se_sess->sess_kref);
329}
330EXPORT_SYMBOL(target_get_session);
331
33933a0e 332void target_put_session(struct se_session *se_sess)
41ac82b6 333{
4149268e
JE		 334 struct se_portal_group *tpg = se_sess->se_tpg;
335
336 if (tpg->se_tpg_tfo->put_session != NULL) {
337 tpg->se_tpg_tfo->put_session(se_sess);
338 return;
339 }
33933a0e 340 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 341}
342EXPORT_SYMBOL(target_put_session);
343
afb999ff
NB		 344static void target_complete_nacl(struct kref *kref)
345{
346 struct se_node_acl *nacl = container_of(kref,
347 struct se_node_acl, acl_kref);
348
349 complete(&nacl->acl_free_comp);
350}
351
352void target_put_nacl(struct se_node_acl *nacl)
353{
354 kref_put(&nacl->acl_kref, target_complete_nacl);
355}
356
c66ac9db
NB		 357void transport_deregister_session_configfs(struct se_session *se_sess)
358{
359 struct se_node_acl *se_nacl;
23388864 360 unsigned long flags;
c66ac9db
NB		 361 /*
362 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
363 */
364 se_nacl = se_sess->se_node_acl;
6708bb27 365 if (se_nacl) {
23388864 366 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 367 if (se_nacl->acl_stop == 0)
368 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 369 /*
370 * If the session list is empty, then clear the pointer.
371 * Otherwise, set the struct se_session pointer from the tail
372 * element of the per struct se_node_acl active session list.
373 */
374 if (list_empty(&se_nacl->acl_sess_list))
375 se_nacl->nacl_sess = NULL;
376 else {
377 se_nacl->nacl_sess = container_of(
378 se_nacl->acl_sess_list.prev,
379 struct se_session, sess_acl_list);
380 }
23388864 381 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 382 }
383}
384EXPORT_SYMBOL(transport_deregister_session_configfs);
385
386void transport_free_session(struct se_session *se_sess)
387{
388 kmem_cache_free(se_sess_cache, se_sess);
389}
390EXPORT_SYMBOL(transport_free_session);
391
392void transport_deregister_session(struct se_session *se_sess)
393{
394 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 395 struct target_core_fabric_ops *se_tfo;
c66ac9db 396 struct se_node_acl *se_nacl;
e63a8e19 397 unsigned long flags;
01468346 398 bool comp_nacl = true;
c66ac9db 399
6708bb27 400 if (!se_tpg) {
c66ac9db
NB		 401 transport_free_session(se_sess);
402 return;
403 }
01468346 404 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 405
e63a8e19 406 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 407 list_del(&se_sess->sess_list);
408 se_sess->se_tpg = NULL;
409 se_sess->fabric_sess_ptr = NULL;
e63a8e19 410 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 411
412 /*
413 * Determine if we need to do extra work for this initiator node's
414 * struct se_node_acl if it had been previously dynamically generated.
415 */
416 se_nacl = se_sess->se_node_acl;
01468346
NB		 417
418 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
419 if (se_nacl && se_nacl->dynamic_node_acl) {
420 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
421 list_del(&se_nacl->acl_list);
422 se_tpg->num_node_acls--;
423 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
424 core_tpg_wait_for_nacl_pr_ref(se_nacl);
425 core_free_device_list_for_node(se_nacl, se_tpg);
426 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
427
428 comp_nacl = false;
429 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 430 }
c66ac9db 431 }
01468346 432 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 433
6708bb27 434 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 435 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 436 /*
afb999ff
NB		 437 * If last kref is dropping now for an explict NodeACL, awake sleeping
438 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
439 * removal context.
01468346
NB		 440 */
441 if (se_nacl && comp_nacl == true)
afb999ff 442 target_put_nacl(se_nacl);
01468346 443
afb999ff 444 transport_free_session(se_sess);
c66ac9db
NB		 445}
446EXPORT_SYMBOL(transport_deregister_session);
447
448/*
a1d8b49a 449 * Called with cmd->t_state_lock held.
c66ac9db 450 */
cf572a96 451static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 452{
42bf829e 453 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 454 unsigned long flags;
455
42bf829e
CH		 456 if (!dev)
457 return;
c66ac9db 458
cf572a96
CH		 459 if (cmd->transport_state & CMD_T_BUSY)
460 return;
c66ac9db 461
cf572a96
CH		 462 spin_lock_irqsave(&dev->execute_task_lock, flags);
463 if (cmd->state_active) {
464 list_del(&cmd->state_list);
cf572a96 465 cmd->state_active = false;
c66ac9db 466 }
cf572a96 467 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 468}
469
f7113a47 470static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
c66ac9db
NB		 471{
472 unsigned long flags;
473
a1d8b49a 474 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 475 /*
476 * Determine if IOCTL context caller in requesting the stopping of this
477 * command for LUN shutdown purposes.
478 */
7d680f3b
CH		 479 if (cmd->transport_state & CMD_T_LUN_STOP) {
480 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
481 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 482
7d680f3b 483 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 484 if (remove_from_lists)
cf572a96 485 target_remove_from_state_list(cmd);
a1d8b49a 486 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 487
a1d8b49a 488 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 489 return 1;
490 }
f7113a47
CH		 491
492 if (remove_from_lists) {
493 target_remove_from_state_list(cmd);
494
495 /*
496 * Clear struct se_cmd->se_lun before the handoff to FE.
497 */
498 cmd->se_lun = NULL;
499 }
500
c66ac9db
NB		 501 /*
502 * Determine if frontend context caller is requesting the stopping of
e3d6f909 503 * this command for frontend exceptions.
c66ac9db 504 */
7d680f3b
CH		 505 if (cmd->transport_state & CMD_T_STOP) {
506 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
507 __func__, __LINE__,
e3d6f909 508 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 509
a1d8b49a 510 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 511
a1d8b49a 512 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 513 return 1;
514 }
f7113a47
CH		 515
516 cmd->transport_state &= ~CMD_T_ACTIVE;
517 if (remove_from_lists) {
518 /*
519 * Some fabric modules like tcm_loop can release
520 * their internally allocated I/O reference now and
521 * struct se_cmd now.
522 *
523 * Fabric modules are expected to return '1' here if the
524 * se_cmd being passed is released at this point,
525 * or zero if not being released.
526 */
527 if (cmd->se_tfo->check_stop_free != NULL) {
528 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
529 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 530 }
f7113a47 531 }
c66ac9db 532
a1d8b49a 533 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 534 return 0;
535}
536
537static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
538{
f7113a47 539 return transport_cmd_check_stop(cmd, true);
c66ac9db
NB		 540}
541
542static void transport_lun_remove_cmd(struct se_cmd *cmd)
543{
e3d6f909 544 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 545 unsigned long flags;
546
547 if (!lun)
548 return;
549
a1d8b49a 550 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 551 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
552 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 553 target_remove_from_state_list(cmd);
c66ac9db 554 }
a1d8b49a 555 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 556
c66ac9db 557 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 558 if (!list_empty(&cmd->se_lun_node))
559 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 560 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
561}
562
563void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
564{
c8e31f26 565 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 566 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 567
568 if (transport_cmd_check_stop_to_fabric(cmd))
569 return;
77039d1e 570 if (remove) {
3df8d40b 571 transport_remove_cmd_from_queue(cmd);
e6a2573f 572 transport_put_cmd(cmd);
77039d1e 573 }
c66ac9db
NB		 574}
575
f7a5cc0b
CH		 576static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
577 bool at_head)
c66ac9db
NB		 578{
579 struct se_device *dev = cmd->se_dev;
e3d6f909 580 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 581 unsigned long flags;
582
c66ac9db 583 if (t_state) {
a1d8b49a 584 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 585 cmd->t_state = t_state;
7d680f3b 586 cmd->transport_state |= CMD_T_ACTIVE;
a1d8b49a 587 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 588 }
589
590 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 591
592 /* If the cmd is already on the list, remove it before we add it */
593 if (!list_empty(&cmd->se_queue_node))
594 list_del(&cmd->se_queue_node);
595 else
596 atomic_inc(&qobj->queue_cnt);
597
f7a5cc0b 598 if (at_head)
07bde79a 599 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 600 else
07bde79a 601 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
7d680f3b 602 cmd->transport_state |= CMD_T_QUEUED;
c66ac9db
NB		 603 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
604
c66ac9db 605 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 606}
607
5951146d
AG		 608static struct se_cmd *
609transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 610{
5951146d 611 struct se_cmd *cmd;
c66ac9db
NB		 612 unsigned long flags;
613
614 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
615 if (list_empty(&qobj->qobj_list)) {
616 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
617 return NULL;
618 }
5951146d 619 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 620
7d680f3b 621 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2 622 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 623 atomic_dec(&qobj->queue_cnt);
624 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
625
5951146d 626 return cmd;
c66ac9db
NB		 627}
628
3df8d40b 629static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 630{
3df8d40b 631 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 632 unsigned long flags;
633
634 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
7d680f3b 635 if (!(cmd->transport_state & CMD_T_QUEUED)) {
c66ac9db
NB		 636 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
637 return;
638 }
7d680f3b 639 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2
RD		 640 atomic_dec(&qobj->queue_cnt);
641 list_del_init(&cmd->se_queue_node);
c66ac9db 642 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
c66ac9db
NB		 643}
644
35e0e757
CH		 645static void target_complete_failure_work(struct work_struct *work)
646{
647 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
648
03e98c9e 649 transport_generic_request_failure(cmd);
35e0e757
CH		 650}
651
5787cacd 652void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 653{
42bf829e 654 struct se_device *dev = cmd->se_dev;
5787cacd 655 int success = scsi_status == GOOD;
c66ac9db 656 unsigned long flags;
c66ac9db 657
5787cacd
CH		 658 cmd->scsi_status = scsi_status;
659
660
a1d8b49a 661 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 662 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 663
c66ac9db 664 if (dev && dev->transport->transport_complete) {
5787cacd
CH		 665 if (dev->transport->transport_complete(cmd,
666 cmd->t_data_sg) != 0) {
c66ac9db 667 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
c66ac9db
NB		 668 success = 1;
669 }
670 }
671
672 /*
5787cacd 673 * See if we are waiting to complete for an exception condition.
c66ac9db 674 */
cf572a96 675 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 676 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 677 complete(&cmd->task_stop_comp);
c66ac9db
NB		 678 return;
679 }
2235007c
CH		 680
681 if (!success)
7d680f3b 682 cmd->transport_state |= CMD_T_FAILED;
2235007c 683
3d28934a
NB		 684 /*
685 * Check for case where an explict ABORT_TASK has been received
686 * and transport_wait_for_tasks() will be waiting for completion..
687 */
688 if (cmd->transport_state & CMD_T_ABORTED &&
689 cmd->transport_state & CMD_T_STOP) {
690 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
691 complete(&cmd->t_transport_stop_comp);
692 return;
693 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 694 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 695 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 696 } else {
35e0e757 697 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 698 }
35e0e757 699
35e0e757 700 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 701 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 702 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 703
35e0e757 704 queue_work(target_completion_wq, &cmd->work);
c66ac9db 705}
6bb35e00
CH		 706EXPORT_SYMBOL(target_complete_cmd);
707
cf572a96 708static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 709{
cf572a96
CH		 710 struct se_device *dev = cmd->se_dev;
711 unsigned long flags;
c66ac9db 712
cf572a96
CH		 713 spin_lock_irqsave(&dev->execute_task_lock, flags);
714 if (!cmd->state_active) {
715 list_add_tail(&cmd->state_list, &dev->state_list);
716 cmd->state_active = true;
c66ac9db 717 }
cf572a96 718 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 719}
720
07bde79a 721/*
f147abb4 722 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 723 */
724
725static void target_qf_do_work(struct work_struct *work)
726{
727 struct se_device *dev = container_of(work, struct se_device,
728 qf_work_queue);
bcac364a 729 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 730 struct se_cmd *cmd, *cmd_tmp;
731
732 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 733 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
734 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 735
bcac364a 736 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 737 list_del(&cmd->se_qf_node);
738 atomic_dec(&dev->dev_qf_count);
739 smp_mb__after_atomic_dec();
07bde79a 740
6708bb27 741 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 742 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 743 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 744 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
745 : "UNKNOWN");
f7a5cc0b
CH		 746
747 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 748 }
07bde79a
NB		 749}
750
c66ac9db
NB		 751unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
752{
753 switch (cmd->data_direction) {
754 case DMA_NONE:
755 return "NONE";
756 case DMA_FROM_DEVICE:
757 return "READ";
758 case DMA_TO_DEVICE:
759 return "WRITE";
760 case DMA_BIDIRECTIONAL:
761 return "BIDI";
762 default:
763 break;
764 }
765
766 return "UNKNOWN";
767}
768
769void transport_dump_dev_state(
770 struct se_device *dev,
771 char *b,
772 int *bl)
773{
774 *bl += sprintf(b + *bl, "Status: ");
775 switch (dev->dev_status) {
776 case TRANSPORT_DEVICE_ACTIVATED:
777 *bl += sprintf(b + *bl, "ACTIVATED");
778 break;
779 case TRANSPORT_DEVICE_DEACTIVATED:
780 *bl += sprintf(b + *bl, "DEACTIVATED");
781 break;
782 case TRANSPORT_DEVICE_SHUTDOWN:
783 *bl += sprintf(b + *bl, "SHUTDOWN");
784 break;
785 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
786 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
787 *bl += sprintf(b + *bl, "OFFLINE");
788 break;
789 default:
790 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
791 break;
792 }
793
5f41a31d 794 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd
NB		 795 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
796 dev->se_sub_dev->se_dev_attrib.block_size,
797 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
c66ac9db
NB		 798 *bl += sprintf(b + *bl, " ");
799}
800
c66ac9db
NB		 801void transport_dump_vpd_proto_id(
802 struct t10_vpd *vpd,
803 unsigned char *p_buf,
804 int p_buf_len)
805{
806 unsigned char buf[VPD_TMP_BUF_SIZE];
807 int len;
808
809 memset(buf, 0, VPD_TMP_BUF_SIZE);
810 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
811
812 switch (vpd->protocol_identifier) {
813 case 0x00:
814 sprintf(buf+len, "Fibre Channel\n");
815 break;
816 case 0x10:
817 sprintf(buf+len, "Parallel SCSI\n");
818 break;
819 case 0x20:
820 sprintf(buf+len, "SSA\n");
821 break;
822 case 0x30:
823 sprintf(buf+len, "IEEE 1394\n");
824 break;
825 case 0x40:
826 sprintf(buf+len, "SCSI Remote Direct Memory Access"
827 " Protocol\n");
828 break;
829 case 0x50:
830 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
831 break;
832 case 0x60:
833 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
834 break;
835 case 0x70:
836 sprintf(buf+len, "Automation/Drive Interface Transport"
837 " Protocol\n");
838 break;
839 case 0x80:
840 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
841 break;
842 default:
843 sprintf(buf+len, "Unknown 0x%02x\n",
844 vpd->protocol_identifier);
845 break;
846 }
847
848 if (p_buf)
849 strncpy(p_buf, buf, p_buf_len);
850 else
6708bb27 851 pr_debug("%s", buf);
c66ac9db
NB		 852}
853
854void
855transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
856{
857 /*
858 * Check if the Protocol Identifier Valid (PIV) bit is set..
859 *
860 * from spc3r23.pdf section 7.5.1
861 */
862 if (page_83[1] & 0x80) {
863 vpd->protocol_identifier = (page_83[0] & 0xf0);
864 vpd->protocol_identifier_set = 1;
865 transport_dump_vpd_proto_id(vpd, NULL, 0);
866 }
867}
868EXPORT_SYMBOL(transport_set_vpd_proto_id);
869
870int transport_dump_vpd_assoc(
871 struct t10_vpd *vpd,
872 unsigned char *p_buf,
873 int p_buf_len)
874{
875 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 876 int ret = 0;
877 int len;
c66ac9db
NB		 878
879 memset(buf, 0, VPD_TMP_BUF_SIZE);
880 len = sprintf(buf, "T10 VPD Identifier Association: ");
881
882 switch (vpd->association) {
883 case 0x00:
884 sprintf(buf+len, "addressed logical unit\n");
885 break;
886 case 0x10:
887 sprintf(buf+len, "target port\n");
888 break;
889 case 0x20:
890 sprintf(buf+len, "SCSI target device\n");
891 break;
892 default:
893 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 894 ret = -EINVAL;
c66ac9db
NB		 895 break;
896 }
897
898 if (p_buf)
899 strncpy(p_buf, buf, p_buf_len);
900 else
6708bb27 901 pr_debug("%s", buf);
c66ac9db
NB		 902
903 return ret;
904}
905
906int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
907{
908 /*
909 * The VPD identification association..
910 *
911 * from spc3r23.pdf Section 7.6.3.1 Table 297
912 */
913 vpd->association = (page_83[1] & 0x30);
914 return transport_dump_vpd_assoc(vpd, NULL, 0);
915}
916EXPORT_SYMBOL(transport_set_vpd_assoc);
917
918int transport_dump_vpd_ident_type(
919 struct t10_vpd *vpd,
920 unsigned char *p_buf,
921 int p_buf_len)
922{
923 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 924 int ret = 0;
925 int len;
c66ac9db
NB		 926
927 memset(buf, 0, VPD_TMP_BUF_SIZE);
928 len = sprintf(buf, "T10 VPD Identifier Type: ");
929
930 switch (vpd->device_identifier_type) {
931 case 0x00:
932 sprintf(buf+len, "Vendor specific\n");
933 break;
934 case 0x01:
935 sprintf(buf+len, "T10 Vendor ID based\n");
936 break;
937 case 0x02:
938 sprintf(buf+len, "EUI-64 based\n");
939 break;
940 case 0x03:
941 sprintf(buf+len, "NAA\n");
942 break;
943 case 0x04:
944 sprintf(buf+len, "Relative target port identifier\n");
945 break;
946 case 0x08:
947 sprintf(buf+len, "SCSI name string\n");
948 break;
949 default:
950 sprintf(buf+len, "Unsupported: 0x%02x\n",
951 vpd->device_identifier_type);
e3d6f909 952 ret = -EINVAL;
c66ac9db
NB		 953 break;
954 }
955
e3d6f909
AG		 956 if (p_buf) {
957 if (p_buf_len < strlen(buf)+1)
958 return -EINVAL;
c66ac9db 959 strncpy(p_buf, buf, p_buf_len);
e3d6f909 960 } else {
6708bb27 961 pr_debug("%s", buf);
e3d6f909 962 }
c66ac9db
NB		 963
964 return ret;
965}
966
967int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
968{
969 /*
970 * The VPD identifier type..
971 *
972 * from spc3r23.pdf Section 7.6.3.1 Table 298
973 */
974 vpd->device_identifier_type = (page_83[1] & 0x0f);
975 return transport_dump_vpd_ident_type(vpd, NULL, 0);
976}
977EXPORT_SYMBOL(transport_set_vpd_ident_type);
978
979int transport_dump_vpd_ident(
980 struct t10_vpd *vpd,
981 unsigned char *p_buf,
982 int p_buf_len)
983{
984 unsigned char buf[VPD_TMP_BUF_SIZE];
985 int ret = 0;
986
987 memset(buf, 0, VPD_TMP_BUF_SIZE);
988
989 switch (vpd->device_identifier_code_set) {
990 case 0x01: /* Binary */
991 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
992 &vpd->device_identifier[0]);
993 break;
994 case 0x02: /* ASCII */
995 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
996 &vpd->device_identifier[0]);
997 break;
998 case 0x03: /* UTF-8 */
999 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1000 &vpd->device_identifier[0]);
1001 break;
1002 default:
1003 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1004 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1005 ret = -EINVAL;
c66ac9db
NB		 1006 break;
1007 }
1008
1009 if (p_buf)
1010 strncpy(p_buf, buf, p_buf_len);
1011 else
6708bb27 1012 pr_debug("%s", buf);
c66ac9db
NB		 1013
1014 return ret;
1015}
1016
1017int
1018transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1019{
1020 static const char hex_str[] = "0123456789abcdef";
1021 int j = 0, i = 4; /* offset to start of the identifer */
1022
1023 /*
1024 * The VPD Code Set (encoding)
1025 *
1026 * from spc3r23.pdf Section 7.6.3.1 Table 296
1027 */
1028 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1029 switch (vpd->device_identifier_code_set) {
1030 case 0x01: /* Binary */
1031 vpd->device_identifier[j++] =
1032 hex_str[vpd->device_identifier_type];
1033 while (i < (4 + page_83[3])) {
1034 vpd->device_identifier[j++] =
1035 hex_str[(page_83[i] & 0xf0) >> 4];
1036 vpd->device_identifier[j++] =
1037 hex_str[page_83[i] & 0x0f];
1038 i++;
1039 }
1040 break;
1041 case 0x02: /* ASCII */
1042 case 0x03: /* UTF-8 */
1043 while (i < (4 + page_83[3]))
1044 vpd->device_identifier[j++] = page_83[i++];
1045 break;
1046 default:
1047 break;
1048 }
1049
1050 return transport_dump_vpd_ident(vpd, NULL, 0);
1051}
1052EXPORT_SYMBOL(transport_set_vpd_ident);
1053
1054static void core_setup_task_attr_emulation(struct se_device *dev)
1055{
1056 /*
1057 * If this device is from Target_Core_Mod/pSCSI, disable the
1058 * SAM Task Attribute emulation.
1059 *
1060 * This is currently not available in upsream Linux/SCSI Target
1061 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1062 */
e3d6f909 1063 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1064 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1065 return;
1066 }
1067
1068 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1069 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1070 " device\n", dev->transport->name,
1071 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1072}
1073
1074static void scsi_dump_inquiry(struct se_device *dev)
1075{
e3d6f909 1076 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1077 char buf[17];
c66ac9db
NB		 1078 int i, device_type;
1079 /*
1080 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1081 */
c66ac9db
NB		 1082 for (i = 0; i < 8; i++)
1083 if (wwn->vendor[i] >= 0x20)
e59a41b6 1084 buf[i] = wwn->vendor[i];
c66ac9db 1085 else
e59a41b6
SAS		 1086 buf[i] = ' ';
1087 buf[i] = '\0';
1088 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1089
c66ac9db
NB		 1090 for (i = 0; i < 16; i++)
1091 if (wwn->model[i] >= 0x20)
e59a41b6 1092 buf[i] = wwn->model[i];
c66ac9db 1093 else
e59a41b6
SAS		 1094 buf[i] = ' ';
1095 buf[i] = '\0';
1096 pr_debug(" Model: %s\n", buf);
c66ac9db 1097
c66ac9db
NB		 1098 for (i = 0; i < 4; i++)
1099 if (wwn->revision[i] >= 0x20)
e59a41b6 1100 buf[i] = wwn->revision[i];
c66ac9db 1101 else
e59a41b6
SAS		 1102 buf[i] = ' ';
1103 buf[i] = '\0';
1104 pr_debug(" Revision: %s\n", buf);
c66ac9db 1105
e3d6f909 1106 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1107 pr_debug(" Type: %s ", scsi_device_type(device_type));
1108 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1109 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1110}
1111
1112struct se_device *transport_add_device_to_core_hba(
1113 struct se_hba *hba,
1114 struct se_subsystem_api *transport,
1115 struct se_subsystem_dev *se_dev,
1116 u32 device_flags,
1117 void *transport_dev,
1118 struct se_dev_limits *dev_limits,
1119 const char *inquiry_prod,
1120 const char *inquiry_rev)
1121{
12a18bdc 1122 int force_pt;
c66ac9db
NB		 1123 struct se_device *dev;
1124
1125 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1126 if (!dev) {
1127 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1128 return NULL;
1129 }
c66ac9db 1130
e3d6f909 1131 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1132 dev->dev_flags = device_flags;
1133 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1134 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1135 dev->se_hba = hba;
1136 dev->se_sub_dev = se_dev;
1137 dev->transport = transport;
c66ac9db
NB		 1138 INIT_LIST_HEAD(&dev->dev_list);
1139 INIT_LIST_HEAD(&dev->dev_sep_list);
1140 INIT_LIST_HEAD(&dev->dev_tmr_list);
c66ac9db 1141 INIT_LIST_HEAD(&dev->delayed_cmd_list);
cf572a96 1142 INIT_LIST_HEAD(&dev->state_list);
07bde79a 1143 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1144 spin_lock_init(&dev->execute_task_lock);
1145 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1146 spin_lock_init(&dev->dev_reservation_lock);
1147 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1148 spin_lock_init(&dev->se_port_lock);
1149 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1150 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1151 atomic_set(&dev->dev_ordered_id, 0);
1152
1153 se_dev_set_default_attribs(dev, dev_limits);
1154
1155 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1156 dev->creation_time = get_jiffies_64();
1157 spin_lock_init(&dev->stats_lock);
1158
1159 spin_lock(&hba->device_lock);
1160 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1161 hba->dev_count++;
1162 spin_unlock(&hba->device_lock);
1163 /*
1164 * Setup the SAM Task Attribute emulation for struct se_device
1165 */
1166 core_setup_task_attr_emulation(dev);
1167 /*
1168 * Force PR and ALUA passthrough emulation with internal object use.
1169 */
1170 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1171 /*
1172 * Setup the Reservations infrastructure for struct se_device
1173 */
1174 core_setup_reservations(dev, force_pt);
1175 /*
1176 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1177 */
1178 if (core_setup_alua(dev, force_pt) < 0)
1179 goto out;
1180
1181 /*
1182 * Startup the struct se_device processing thread
1183 */
1184 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1185 "LIO_%s", dev->transport->name);
c66ac9db 1186 if (IS_ERR(dev->process_thread)) {
6708bb27 1187 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1188 dev->transport->name);
c66ac9db
NB		 1189 goto out;
1190 }
07bde79a
NB		 1191 /*
1192 * Setup work_queue for QUEUE_FULL
1193 */
1194 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1195 /*
1196 * Preload the initial INQUIRY const values if we are doing
1197 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1198 * passthrough because this is being provided by the backend LLD.
1199 * This is required so that transport_get_inquiry() copies these
1200 * originals once back into DEV_T10_WWN(dev) for the virtual device
1201 * setup.
1202 */
e3d6f909 1203 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1204 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1205 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1206 " INQUIRY consts\n");
1207 goto out;
1208 }
1209
e3d6f909
AG		 1210 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1211 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1212 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1213 }
1214 scsi_dump_inquiry(dev);
1215
12a18bdc 1216 return dev;
c66ac9db 1217out:
c66ac9db
NB		 1218 kthread_stop(dev->process_thread);
1219
1220 spin_lock(&hba->device_lock);
1221 list_del(&dev->dev_list);
1222 hba->dev_count--;
1223 spin_unlock(&hba->device_lock);
1224
1225 se_release_vpd_for_dev(dev);
1226
c66ac9db
NB		 1227 kfree(dev);
1228
1229 return NULL;
1230}
1231EXPORT_SYMBOL(transport_add_device_to_core_hba);
1232
1fd032ee 1233int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1234{
1235 struct se_device *dev = cmd->se_dev;
1236
1237 if (cmd->unknown_data_length) {
1238 cmd->data_length = size;
1239 } else if (size != cmd->data_length) {
1240 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1241 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1242 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1243 cmd->data_length, size, cmd->t_task_cdb[0]);
1244
1245 cmd->cmd_spdtl = size;
1246
1247 if (cmd->data_direction == DMA_TO_DEVICE) {
1248 pr_err("Rejecting underflow/overflow"
1249 " WRITE data\n");
1250 goto out_invalid_cdb_field;
1251 }
1252 /*
1253 * Reject READ_* or WRITE_* with overflow/underflow for
1254 * type SCF_SCSI_DATA_CDB.
1255 */
1256 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1257 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1258 " CDB on non 512-byte sector setup subsystem"
1259 " plugin: %s\n", dev->transport->name);
1260 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1261 goto out_invalid_cdb_field;
1262 }
1263
1264 if (size > cmd->data_length) {
1265 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1266 cmd->residual_count = (size - cmd->data_length);
1267 } else {
1268 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1269 cmd->residual_count = (cmd->data_length - size);
1270 }
1271 cmd->data_length = size;
1272 }
1273
1274 return 0;
1275
1276out_invalid_cdb_field:
1277 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1278 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1279 return -EINVAL;
1280}
1281
c66ac9db
NB		 1282/*
1283 * Used by fabric modules containing a local struct se_cmd within their
1284 * fabric dependent per I/O descriptor.
1285 */
1286void transport_init_se_cmd(
1287 struct se_cmd *cmd,
1288 struct target_core_fabric_ops *tfo,
1289 struct se_session *se_sess,
1290 u32 data_length,
1291 int data_direction,
1292 int task_attr,
1293 unsigned char *sense_buffer)
1294{
5951146d
AG		 1295 INIT_LIST_HEAD(&cmd->se_lun_node);
1296 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1297 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1298 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1299 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1300 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1301 init_completion(&cmd->transport_lun_fe_stop_comp);
1302 init_completion(&cmd->transport_lun_stop_comp);
1303 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1304 init_completion(&cmd->cmd_wait_comp);
cf572a96 1305 init_completion(&cmd->task_stop_comp);
a1d8b49a 1306 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1307 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1308
1309 cmd->se_tfo = tfo;
1310 cmd->se_sess = se_sess;
1311 cmd->data_length = data_length;
1312 cmd->data_direction = data_direction;
1313 cmd->sam_task_attr = task_attr;
1314 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1315
1316 cmd->state_active = false;
c66ac9db
NB		 1317}
1318EXPORT_SYMBOL(transport_init_se_cmd);
1319
1320static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1321{
1322 /*
1323 * Check if SAM Task Attribute emulation is enabled for this
1324 * struct se_device storage object
1325 */
5951146d 1326 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1327 return 0;
1328
e66ecd50 1329 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1330 pr_debug("SAM Task Attribute ACA"
c66ac9db 1331 " emulation is not supported\n");
e3d6f909 1332 return -EINVAL;
c66ac9db
NB		 1333 }
1334 /*
1335 * Used to determine when ORDERED commands should go from
1336 * Dormant to Active status.
1337 */
5951146d 1338 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1339 smp_mb__after_atomic_inc();
6708bb27 1340 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1341 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1342 cmd->se_dev->transport->name);
c66ac9db
NB		 1343 return 0;
1344}
1345
a12f41f8 1346/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1347 *
1348 * Called from fabric RX Thread.
1349 */
a12f41f8 1350int target_setup_cmd_from_cdb(
c66ac9db
NB		 1351 struct se_cmd *cmd,
1352 unsigned char *cdb)
1353{
cb4f4d3c
CH		 1354 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1355 u32 pr_reg_type = 0;
1356 u8 alua_ascq = 0;
1357 unsigned long flags;
c66ac9db
NB		 1358 int ret;
1359
c66ac9db
NB		 1360 /*
1361 * Ensure that the received CDB is less than the max (252 + 8) bytes
1362 * for VARIABLE_LENGTH_CMD
1363 */
1364 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1365 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1366 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1367 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1368 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1369 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1370 return -EINVAL;
c66ac9db
NB		 1371 }
1372 /*
1373 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1374 * allocate the additional extended CDB buffer now.. Otherwise
1375 * setup the pointer from __t_task_cdb to t_task_cdb.
1376 */
a1d8b49a
AG		 1377 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1378 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1379 GFP_KERNEL);
6708bb27
AG		 1380 if (!cmd->t_task_cdb) {
1381 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1382 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1383 scsi_command_size(cdb),
a1d8b49a 1384 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1385 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1386 cmd->scsi_sense_reason =
1387 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1388 return -ENOMEM;
c66ac9db
NB		 1389 }
1390 } else
a1d8b49a 1391 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1392 /*
a1d8b49a 1393 * Copy the original CDB into cmd->
c66ac9db 1394 */
a1d8b49a 1395 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1396
1397 /*
1398 * Check for an existing UNIT ATTENTION condition
1399 */
1400 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1401 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1402 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1403 return -EINVAL;
1404 }
1405
1406 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1407 if (ret != 0) {
1408 /*
1409 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1410 * The ALUA additional sense code qualifier (ASCQ) is determined
1411 * by the ALUA primary or secondary access state..
1412 */
1413 if (ret > 0) {
1414 pr_debug("[%s]: ALUA TG Port not available, "
1415 "SenseKey: NOT_READY, ASC/ASCQ: "
1416 "0x04/0x%02x\n",
1417 cmd->se_tfo->get_fabric_name(), alua_ascq);
1418
1419 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1420 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1421 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1422 return -EINVAL;
1423 }
1424 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1425 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1426 return -EINVAL;
1427 }
1428
1429 /*
1430 * Check status for SPC-3 Persistent Reservations
1431 */
1432 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1433 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1434 cmd, cdb, pr_reg_type) != 0) {
1435 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1436 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1437 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1438 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1439 return -EBUSY;
1440 }
1441 /*
1442 * This means the CDB is allowed for the SCSI Initiator port
1443 * when said port is *NOT* holding the legacy SPC-2 or
1444 * SPC-3 Persistent Reservation.
1445 */
1446 }
1447
1fd032ee 1448 ret = cmd->se_dev->transport->parse_cdb(cmd);
c66ac9db
NB		 1449 if (ret < 0)
1450 return ret;
cb4f4d3c
CH		 1451
1452 spin_lock_irqsave(&cmd->t_state_lock, flags);
1453 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1454 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1455
c66ac9db
NB		 1456 /*
1457 * Check for SAM Task Attribute Emulation
1458 */
1459 if (transport_check_alloc_task_attr(cmd) < 0) {
1460 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1461 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1462 return -EINVAL;
c66ac9db
NB		 1463 }
1464 spin_lock(&cmd->se_lun->lun_sep_lock);
1465 if (cmd->se_lun->lun_sep)
1466 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1467 spin_unlock(&cmd->se_lun->lun_sep_lock);
1468 return 0;
1469}
a12f41f8 1470EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1471
695434e1
NB		 1472/*
1473 * Used by fabric module frontends to queue tasks directly.
1474 * Many only be used from process context only
1475 */
1476int transport_handle_cdb_direct(
1477 struct se_cmd *cmd)
1478{
dd8ae59d
NB		 1479 int ret;
1480
695434e1
NB		 1481 if (!cmd->se_lun) {
1482 dump_stack();
6708bb27 1483 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1484 return -EINVAL;
1485 }
1486 if (in_interrupt()) {
1487 dump_stack();
6708bb27 1488 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1489 " from interrupt context\n");
1490 return -EINVAL;
1491 }
dd8ae59d 1492 /*
7d680f3b 1493 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
dd8ae59d
NB		 1494 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1495 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1496 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1497 *
1498 * Also, we don't take cmd->t_state_lock here as we only expect
1499 * this to be called for initial descriptor submission.
1500 */
1501 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1502 cmd->transport_state |= CMD_T_ACTIVE;
1503
dd8ae59d
NB		 1504 /*
1505 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1506 * so follow TRANSPORT_NEW_CMD processing thread context usage
1507 * and call transport_generic_request_failure() if necessary..
1508 */
1509 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1510 if (ret < 0)
1511 transport_generic_request_failure(cmd);
1512
dd8ae59d 1513 return 0;
695434e1
NB		 1514}
1515EXPORT_SYMBOL(transport_handle_cdb_direct);
1516
a6360785
NB		 1517/**
1518 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1519 *
1520 * @se_cmd: command descriptor to submit
1521 * @se_sess: associated se_sess for endpoint
1522 * @cdb: pointer to SCSI CDB
1523 * @sense: pointer to SCSI sense buffer
1524 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1525 * @data_length: fabric expected data transfer length
1526 * @task_addr: SAM task attribute
1527 * @data_dir: DMA data direction
1528 * @flags: flags for command submission from target_sc_flags_tables
1529 *
1530 * This may only be called from process context, and also currently
1531 * assumes internal allocation of fabric payload buffer by target-core.
1532 **/
1edcdb49 1533void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1534 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1535 u32 data_length, int task_attr, int data_dir, int flags)
1536{
1537 struct se_portal_group *se_tpg;
1538 int rc;
1539
1540 se_tpg = se_sess->se_tpg;
1541 BUG_ON(!se_tpg);
1542 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1543 BUG_ON(in_interrupt());
1544 /*
1545 * Initialize se_cmd for target operation. From this point
1546 * exceptions are handled by sending exception status via
1547 * target_core_fabric_ops->queue_status() callback
1548 */
1549 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1550 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1551 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1552 se_cmd->unknown_data_length = 1;
a6360785
NB		 1553 /*
1554 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1555 * se_sess->sess_cmd_list. A second kref_get here is necessary
1556 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1557 * kref_put() to happen during fabric packet acknowledgement.
1558 */
1559 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1560 /*
1561 * Signal bidirectional data payloads to target-core
1562 */
1563 if (flags & TARGET_SCF_BIDI_OP)
1564 se_cmd->se_cmd_flags |= SCF_BIDI;
1565 /*
1566 * Locate se_lun pointer and attach it to struct se_cmd
1567 */
735703ca
NB		 1568 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1569 transport_send_check_condition_and_sense(se_cmd,
1570 se_cmd->scsi_sense_reason, 0);
1571 target_put_sess_cmd(se_sess, se_cmd);
1572 return;
1573 }
d6e0175c 1574
a12f41f8 1575 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1576 if (rc != 0) {
1577 transport_generic_request_failure(se_cmd);
1578 return;
1579 }
11e319ed
AG		 1580
1581 /*
1582 * Check if we need to delay processing because of ALUA
1583 * Active/NonOptimized primary access state..
1584 */
1585 core_alua_check_nonop_delay(se_cmd);
1586
a6360785
NB		 1587 /*
1588 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1589 * for immediate execution of READs, otherwise wait for
1590 * transport_generic_handle_data() to be called for WRITEs
1591 * when fabric has filled the incoming buffer.
1592 */
1593 transport_handle_cdb_direct(se_cmd);
1edcdb49 1594 return;
a6360785
NB		 1595}
1596EXPORT_SYMBOL(target_submit_cmd);
1597
9f0d05c2
NB		 1598static void target_complete_tmr_failure(struct work_struct *work)
1599{
1600 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1601
1602 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1603 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1604 transport_generic_free_cmd(se_cmd, 0);
1605}
1606
ea98d7f9
AG		 1607/**
1608 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1609 * for TMR CDBs
1610 *
1611 * @se_cmd: command descriptor to submit
1612 * @se_sess: associated se_sess for endpoint
1613 * @sense: pointer to SCSI sense buffer
1614 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1615 * @fabric_context: fabric context for TMR req
1616 * @tm_type: Type of TM request
c0974f89
NB		 1617 * @gfp: gfp type for caller
1618 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1619 * @flags: submit cmd flags
ea98d7f9
AG		 1620 *
1621 * Callable from all contexts.
1622 **/
1623
c7042cae 1624int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1625 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1626 void *fabric_tmr_ptr, unsigned char tm_type,
1627 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1628{
1629 struct se_portal_group *se_tpg;
1630 int ret;
1631
1632 se_tpg = se_sess->se_tpg;
1633 BUG_ON(!se_tpg);
1634
1635 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1636 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1637 /*
1638 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1639 * allocation failure.
1640 */
c0974f89 1641 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1642 if (ret < 0)
1643 return -ENOMEM;
ea98d7f9 1644
c0974f89
NB		 1645 if (tm_type == TMR_ABORT_TASK)
1646 se_cmd->se_tmr_req->ref_task_tag = tag;
1647
ea98d7f9
AG		 1648 /* See target_submit_cmd for commentary */
1649 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1650
ea98d7f9
AG		 1651 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1652 if (ret) {
9f0d05c2
NB		 1653 /*
1654 * For callback during failure handling, push this work off
1655 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1656 */
1657 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1658 schedule_work(&se_cmd->work);
c7042cae 1659 return 0;
ea98d7f9
AG		 1660 }
1661 transport_generic_handle_tmr(se_cmd);
c7042cae 1662 return 0;
ea98d7f9
AG		 1663}
1664EXPORT_SYMBOL(target_submit_tmr);
1665
c66ac9db
NB		 1666/*
1667 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1668 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1669 * complete setup in TCM process context w/ TFO->new_cmd_map().
1670 */
1671int transport_generic_handle_cdb_map(
1672 struct se_cmd *cmd)
1673{
e3d6f909 1674 if (!cmd->se_lun) {
c66ac9db 1675 dump_stack();
6708bb27 1676 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1677 return -EINVAL;
c66ac9db
NB		 1678 }
1679
f7a5cc0b 1680 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1681 return 0;
1682}
1683EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1684
1685/* transport_generic_handle_data():
1686 *
1687 *
1688 */
1689int transport_generic_handle_data(
1690 struct se_cmd *cmd)
1691{
1692 /*
1693 * For the software fabric case, then we assume the nexus is being
1694 * failed/shutdown when signals are pending from the kthread context
1695 * caller, so we return a failure. For the HW target mode case running
1696 * in interrupt code, the signal_pending() check is skipped.
1697 */
1698 if (!in_interrupt() && signal_pending(current))
e3d6f909 1699 return -EPERM;
c66ac9db
NB		 1700 /*
1701 * If the received CDB has aleady been ABORTED by the generic
1702 * target engine, we now call transport_check_aborted_status()
1703 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1704 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1705 * sequences at this point.
1706 */
1707 if (transport_check_aborted_status(cmd, 1) != 0)
1708 return 0;
1709
f7a5cc0b 1710 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1711 return 0;
1712}
1713EXPORT_SYMBOL(transport_generic_handle_data);
1714
1715/* transport_generic_handle_tmr():
1716 *
1717 *
1718 */
1719int transport_generic_handle_tmr(
1720 struct se_cmd *cmd)
1721{
f7a5cc0b 1722 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1723 return 0;
1724}
1725EXPORT_SYMBOL(transport_generic_handle_tmr);
1726
cdbb70bb 1727/*
cf572a96 1728 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1729 * has completed.
1730 */
cf572a96 1731bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1732{
cdbb70bb
CH		 1733 bool was_active = false;
1734
cf572a96
CH		 1735 if (cmd->transport_state & CMD_T_BUSY) {
1736 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1737 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1738
cf572a96
CH		 1739 pr_debug("cmd %p waiting to complete\n", cmd);
1740 wait_for_completion(&cmd->task_stop_comp);
1741 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1742
1743 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1744 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1745 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1746 was_active = true;
1747 }
1748
cdbb70bb
CH		 1749 return was_active;
1750}
1751
c66ac9db
NB		 1752/*
1753 * Handle SAM-esque emulation for generic transport request failures.
1754 */
2fbff127 1755void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1756{
07bde79a
NB		 1757 int ret = 0;
1758
6708bb27 1759 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1760 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1761 cmd->t_task_cdb[0]);
03e98c9e 1762 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1763 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1764 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1765 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1766 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1767 (cmd->transport_state & CMD_T_STOP) != 0,
1768 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1769
c66ac9db
NB		 1770 /*
1771 * For SAM Task Attribute emulation for failed struct se_cmd
1772 */
1773 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1774 transport_complete_task_attr(cmd);
1775
03e98c9e
NB		 1776 switch (cmd->scsi_sense_reason) {
1777 case TCM_NON_EXISTENT_LUN:
1778 case TCM_UNSUPPORTED_SCSI_OPCODE:
1779 case TCM_INVALID_CDB_FIELD:
1780 case TCM_INVALID_PARAMETER_LIST:
1781 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1782 case TCM_UNKNOWN_MODE_PAGE:
1783 case TCM_WRITE_PROTECTED:
1784 case TCM_CHECK_CONDITION_ABORT_CMD:
1785 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1786 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1787 break;
03e98c9e 1788 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1789 /*
1790 * No SENSE Data payload for this case, set SCSI Status
1791 * and queue the response to $FABRIC_MOD.
1792 *
1793 * Uses linux/include/scsi/scsi.h SAM status codes defs
1794 */
1795 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1796 /*
1797 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1798 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1799 * CONFLICT STATUS.
1800 *
1801 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1802 */
e3d6f909
AG		 1803 if (cmd->se_sess &&
1804 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1805 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1806 cmd->orig_fe_lun, 0x2C,
1807 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1808
07bde79a 1809 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1810 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1811 goto queue_full;
c66ac9db 1812 goto check_stop;
c66ac9db 1813 default:
6708bb27 1814 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1815 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1816 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1817 break;
1818 }
16ab8e60
NB		 1819 /*
1820 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1821 * make the call to transport_send_check_condition_and_sense()
1822 * directly. Otherwise expect the fabric to make the call to
1823 * transport_send_check_condition_and_sense() after handling
1824 * possible unsoliticied write data payloads.
1825 */
03e98c9e
NB		 1826 ret = transport_send_check_condition_and_sense(cmd,
1827 cmd->scsi_sense_reason, 0);
1828 if (ret == -EAGAIN || ret == -ENOMEM)
1829 goto queue_full;
07bde79a 1830
c66ac9db
NB		 1831check_stop:
1832 transport_lun_remove_cmd(cmd);
6708bb27 1833 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1834 ;
07bde79a
NB		 1835 return;
1836
1837queue_full:
e057f533
CH		 1838 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1839 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1840}
2fbff127 1841EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1842
5f41a31d 1843static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1844{
0c2ad7d1 1845 int error = 0;
5f41a31d
CH		 1846
1847 spin_lock_irq(&cmd->t_state_lock);
1848 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1849 spin_unlock_irq(&cmd->t_state_lock);
1850
1851 if (cmd->execute_cmd)
1852 error = cmd->execute_cmd(cmd);
5f41a31d
CH		 1853
1854 if (error) {
1855 spin_lock_irq(&cmd->t_state_lock);
1856 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1857 spin_unlock_irq(&cmd->t_state_lock);
1858
1859 transport_generic_request_failure(cmd);
1860 }
1861}
1862
1863static void target_execute_cmd(struct se_cmd *cmd)
1864{
1865 struct se_device *dev = cmd->se_dev;
1866
f7113a47
CH		 1867 /*
1868 * Determine if IOCTL context caller in requesting the stopping of this
1869 * command for LUN shutdown purposes.
1870 */
1871 spin_lock_irq(&cmd->t_state_lock);
1872 if (cmd->transport_state & CMD_T_LUN_STOP) {
1873 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1874 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1875
1876 cmd->transport_state &= ~CMD_T_ACTIVE;
1877 spin_unlock_irq(&cmd->t_state_lock);
1878 complete(&cmd->transport_lun_stop_comp);
1879 return;
1880 }
1881 /*
1882 * Determine if frontend context caller is requesting the stopping of
1883 * this command for frontend exceptions.
1884 */
1885 if (cmd->transport_state & CMD_T_STOP) {
1886 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1887 __func__, __LINE__,
1888 cmd->se_tfo->get_task_tag(cmd));
1889
1890 spin_unlock_irq(&cmd->t_state_lock);
1891 complete(&cmd->t_transport_stop_comp);
5f41a31d 1892 return;
f7113a47
CH		 1893 }
1894
1895 cmd->t_state = TRANSPORT_PROCESSING;
1896 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d
CH		 1897
1898 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1899 goto execute;
1900
c66ac9db 1901 /*
25985edc 1902 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1903 * to allow the passed struct se_cmd list of tasks to the front of the list.
1904 */
5f41a31d
CH		 1905 switch (cmd->sam_task_attr) {
1906 case MSG_HEAD_TAG:
1907 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1908 "se_ordered_id: %u\n",
1909 cmd->t_task_cdb[0], cmd->se_ordered_id);
1910 goto execute;
1911 case MSG_ORDERED_TAG:
1912 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1913 smp_mb__after_atomic_inc();
1914
5f41a31d
CH		 1915 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1916 " se_ordered_id: %u\n",
1917 cmd->t_task_cdb[0], cmd->se_ordered_id);
1918
c66ac9db 1919 /*
5f41a31d
CH		 1920 * Execute an ORDERED command if no other older commands
1921 * exist that need to be completed first.
c66ac9db 1922 */
5f41a31d
CH		 1923 if (!atomic_read(&dev->simple_cmds))
1924 goto execute;
1925 break;
1926 default:
c66ac9db
NB		 1927 /*
1928 * For SIMPLE and UNTAGGED Task Attribute commands
1929 */
5f41a31d 1930 atomic_inc(&dev->simple_cmds);
c66ac9db 1931 smp_mb__after_atomic_inc();
5f41a31d 1932 break;
c66ac9db 1933 }
5f41a31d
CH		 1934
1935 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1936 spin_lock(&dev->delayed_cmd_lock);
5f41a31d
CH		 1937 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1938 spin_unlock(&dev->delayed_cmd_lock);
c66ac9db 1939
6708bb27 1940 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1941 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1942 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db 1943 cmd->se_ordered_id);
5f41a31d 1944 return;
c66ac9db 1945 }
c66ac9db 1946
5f41a31d 1947execute:
c66ac9db 1948 /*
5f41a31d 1949 * Otherwise, no ORDERED task attributes exist..
c66ac9db 1950 */
5f41a31d 1951 __target_execute_cmd(cmd);
c66ac9db
NB		 1952}
1953
c66ac9db
NB		 1954/*
1955 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1956 */
1957static int transport_get_sense_data(struct se_cmd *cmd)
1958{
1959 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 1960 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1961 unsigned long flags;
1962 u32 offset = 0;
1963
e3d6f909
AG		 1964 WARN_ON(!cmd->se_lun);
1965
42bf829e
CH		 1966 if (!dev)
1967 return 0;
1968
a1d8b49a 1969 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1970 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 1971 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1972 return 0;
1973 }
1974
cf572a96
CH		 1975 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1976 goto out;
c66ac9db 1977
cf572a96
CH		 1978 if (!dev->transport->get_sense_buffer) {
1979 pr_err("dev->transport->get_sense_buffer is NULL\n");
1980 goto out;
1981 }
c66ac9db 1982
5787cacd 1983 sense_buffer = dev->transport->get_sense_buffer(cmd);
cf572a96 1984 if (!sense_buffer) {
5787cacd 1985 pr_err("ITT 0x%08x cmd %p: Unable to locate"
cf572a96 1986 " sense buffer for task with sense\n",
5787cacd 1987 cmd->se_tfo->get_task_tag(cmd), cmd);
cf572a96 1988 goto out;
c66ac9db 1989 }
5787cacd 1990
cf572a96
CH		 1991 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1992
1993 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1994
1995 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
cf572a96
CH		 1996
1997 /* Automatically padded */
1998 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1999
2000 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2001 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2002 return 0;
2003
785fdf70 2004out:
a1d8b49a 2005 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2006 return -1;
2007}
2008
5f41a31d
CH		 2009/*
2010 * Process all commands up to the last received ORDERED task attribute which
2011 * requires another blocking boundary
2012 */
2013static void target_restart_delayed_cmds(struct se_device *dev)
2014{
2015 for (;;) {
2016 struct se_cmd *cmd;
2017
2018 spin_lock(&dev->delayed_cmd_lock);
2019 if (list_empty(&dev->delayed_cmd_list)) {
2020 spin_unlock(&dev->delayed_cmd_lock);
2021 break;
2022 }
2023
2024 cmd = list_entry(dev->delayed_cmd_list.next,
2025 struct se_cmd, se_delayed_node);
2026 list_del(&cmd->se_delayed_node);
2027 spin_unlock(&dev->delayed_cmd_lock);
2028
2029 __target_execute_cmd(cmd);
2030
2031 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
2032 break;
2033 }
2034}
2035
c66ac9db 2036/*
35e0e757 2037 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 2038 * and ordered cmds need to have their tasks added to the execution queue.
2039 */
2040static void transport_complete_task_attr(struct se_cmd *cmd)
2041{
5951146d 2042 struct se_device *dev = cmd->se_dev;
c66ac9db 2043
e66ecd50 2044 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 2045 atomic_dec(&dev->simple_cmds);
2046 smp_mb__after_atomic_dec();
2047 dev->dev_cur_ordered_id++;
6708bb27 2048 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 2049 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
2050 cmd->se_ordered_id);
e66ecd50 2051 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 2052 dev->dev_cur_ordered_id++;
6708bb27 2053 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 2054 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
2055 cmd->se_ordered_id);
e66ecd50 2056 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 2057 atomic_dec(&dev->dev_ordered_sync);
2058 smp_mb__after_atomic_dec();
c66ac9db
NB		 2059
2060 dev->dev_cur_ordered_id++;
6708bb27 2061 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 2062 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
2063 }
c66ac9db 2064
5f41a31d 2065 target_restart_delayed_cmds(dev);
c66ac9db
NB		 2066}
2067
e057f533 2068static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 2069{
2070 int ret = 0;
2071
e057f533
CH		 2072 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2073 transport_complete_task_attr(cmd);
2074
2075 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2076 ret = cmd->se_tfo->queue_status(cmd);
2077 if (ret)
2078 goto out;
2079 }
07bde79a
NB		 2080
2081 switch (cmd->data_direction) {
2082 case DMA_FROM_DEVICE:
2083 ret = cmd->se_tfo->queue_data_in(cmd);
2084 break;
2085 case DMA_TO_DEVICE:
ec98f782 2086 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 2087 ret = cmd->se_tfo->queue_data_in(cmd);
2088 if (ret < 0)
e057f533 2089 break;
07bde79a
NB		 2090 }
2091 /* Fall through for DMA_TO_DEVICE */
2092 case DMA_NONE:
2093 ret = cmd->se_tfo->queue_status(cmd);
2094 break;
2095 default:
2096 break;
2097 }
2098
e057f533
CH		 2099out:
2100 if (ret < 0) {
2101 transport_handle_queue_full(cmd, cmd->se_dev);
2102 return;
2103 }
2104 transport_lun_remove_cmd(cmd);
2105 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2106}
2107
2108static void transport_handle_queue_full(
2109 struct se_cmd *cmd,
e057f533 2110 struct se_device *dev)
07bde79a
NB		 2111{
2112 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 2113 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2114 atomic_inc(&dev->dev_qf_count);
2115 smp_mb__after_atomic_inc();
2116 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2117
2118 schedule_work(&cmd->se_dev->qf_work_queue);
2119}
2120
35e0e757 2121static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2122{
35e0e757 2123 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 2124 int reason = 0, ret;
35e0e757 2125
c66ac9db
NB		 2126 /*
2127 * Check if we need to move delayed/dormant tasks from cmds on the
2128 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2129 * Attribute.
2130 */
5951146d 2131 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 2132 transport_complete_task_attr(cmd);
07bde79a
NB		 2133 /*
2134 * Check to schedule QUEUE_FULL work, or execute an existing
2135 * cmd->transport_qf_callback()
2136 */
2137 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2138 schedule_work(&cmd->se_dev->qf_work_queue);
2139
c66ac9db
NB		 2140 /*
2141 * Check if we need to retrieve a sense buffer from
2142 * the struct se_cmd in question.
2143 */
2144 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2145 if (transport_get_sense_data(cmd) < 0)
2146 reason = TCM_NON_EXISTENT_LUN;
2147
c66ac9db 2148 if (cmd->scsi_status) {
07bde79a 2149 ret = transport_send_check_condition_and_sense(
c66ac9db 2150 cmd, reason, 1);
f147abb4 2151 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 2152 goto queue_full;
2153
c66ac9db
NB		 2154 transport_lun_remove_cmd(cmd);
2155 transport_cmd_check_stop_to_fabric(cmd);
2156 return;
2157 }
2158 }
2159 /*
25985edc 2160 * Check for a callback, used by amongst other things
c66ac9db
NB		 2161 * XDWRITE_READ_10 emulation.
2162 */
2163 if (cmd->transport_complete_callback)
2164 cmd->transport_complete_callback(cmd);
2165
2166 switch (cmd->data_direction) {
2167 case DMA_FROM_DEVICE:
2168 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2169 if (cmd->se_lun->lun_sep) {
2170 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2171 cmd->data_length;
2172 }
2173 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 2174
07bde79a 2175 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2176 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2177 goto queue_full;
c66ac9db
NB		 2178 break;
2179 case DMA_TO_DEVICE:
2180 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2181 if (cmd->se_lun->lun_sep) {
2182 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2183 cmd->data_length;
2184 }
2185 spin_unlock(&cmd->se_lun->lun_sep_lock);
2186 /*
2187 * Check if we need to send READ payload for BIDI-COMMAND
2188 */
ec98f782 2189 if (cmd->t_bidi_data_sg) {
c66ac9db 2190 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2191 if (cmd->se_lun->lun_sep) {
2192 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2193 cmd->data_length;
2194 }
2195 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2196 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2197 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2198 goto queue_full;
c66ac9db
NB		 2199 break;
2200 }
2201 /* Fall through for DMA_TO_DEVICE */
2202 case DMA_NONE:
07bde79a 2203 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2204 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2205 goto queue_full;
c66ac9db
NB		 2206 break;
2207 default:
2208 break;
2209 }
2210
2211 transport_lun_remove_cmd(cmd);
2212 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2213 return;
2214
2215queue_full:
6708bb27 2216 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2217 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2218 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2219 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2220}
2221
6708bb27 2222static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2223{
ec98f782 2224 struct scatterlist *sg;
ec98f782 2225 int count;
c66ac9db 2226
6708bb27
AG		 2227 for_each_sg(sgl, sg, nents, count)
2228 __free_page(sg_page(sg));
c66ac9db 2229
6708bb27
AG		 2230 kfree(sgl);
2231}
c66ac9db 2232
6708bb27
AG		 2233static inline void transport_free_pages(struct se_cmd *cmd)
2234{
2235 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2236 return;
2237
2238 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2239 cmd->t_data_sg = NULL;
2240 cmd->t_data_nents = 0;
c66ac9db 2241
6708bb27 2242 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2243 cmd->t_bidi_data_sg = NULL;
2244 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2245}
2246
e26d99ae
CH		 2247/**
2248 * transport_release_cmd - free a command
2249 * @cmd: command to free
2250 *
2251 * This routine unconditionally frees a command, and reference counting
2252 * or list removal must be done in the caller.
2253 */
2254static void transport_release_cmd(struct se_cmd *cmd)
2255{
2256 BUG_ON(!cmd->se_tfo);
2257
c8e31f26 2258 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2259 core_tmr_release_req(cmd->se_tmr_req);
2260 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2261 kfree(cmd->t_task_cdb);
2262 /*
7481deb4
NB		 2263 * If this cmd has been setup with target_get_sess_cmd(), drop
2264 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2265 */
7481deb4
NB		 2266 if (cmd->check_release != 0) {
2267 target_put_sess_cmd(cmd->se_sess, cmd);
2268 return;
2269 }
e26d99ae
CH		 2270 cmd->se_tfo->release_cmd(cmd);
2271}
2272
d3df7825
CH		 2273/**
2274 * transport_put_cmd - release a reference to a command
2275 * @cmd: command to release
2276 *
2277 * This routine releases our reference to the command and frees it if possible.
2278 */
39c05f32 2279static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 2280{
2281 unsigned long flags;
c66ac9db 2282
a1d8b49a 2283 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 2284 if (atomic_read(&cmd->t_fe_count)) {
2285 if (!atomic_dec_and_test(&cmd->t_fe_count))
2286 goto out_busy;
2287 }
2288
7d680f3b
CH		 2289 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2290 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2291 target_remove_from_state_list(cmd);
c66ac9db 2292 }
a1d8b49a 2293 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2294
c66ac9db 2295 transport_free_pages(cmd);
31afc39c 2296 transport_release_cmd(cmd);
39c05f32 2297 return;
4911e3cc
CH		 2298out_busy:
2299 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2300}
2301
c66ac9db 2302/*
ec98f782
AG		 2303 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2304 * allocating in the core.
c66ac9db
NB		 2305 * @cmd: Associated se_cmd descriptor
2306 * @mem: SGL style memory for TCM WRITE / READ
2307 * @sg_mem_num: Number of SGL elements
2308 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2309 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2310 *
2311 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2312 * of parameters.
2313 */
2314int transport_generic_map_mem_to_cmd(
2315 struct se_cmd *cmd,
5951146d
AG		 2316 struct scatterlist *sgl,
2317 u32 sgl_count,
2318 struct scatterlist *sgl_bidi,
2319 u32 sgl_bidi_count)
c66ac9db 2320{
5951146d 2321 if (!sgl || !sgl_count)
c66ac9db 2322 return 0;
c66ac9db 2323
64f1db38
CH		 2324 /*
2325 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2326 * scatterlists already have been set to follow what the fabric
2327 * passes for the original expected data transfer length.
2328 */
2329 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2330 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2331 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2332 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2333 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2334 return -EINVAL;
2335 }
c66ac9db 2336
64f1db38
CH		 2337 cmd->t_data_sg = sgl;
2338 cmd->t_data_nents = sgl_count;
c66ac9db 2339
64f1db38
CH		 2340 if (sgl_bidi && sgl_bidi_count) {
2341 cmd->t_bidi_data_sg = sgl_bidi;
2342 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db 2343 }
64f1db38 2344 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 2345 return 0;
2346}
2347EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2348
4949314c 2349void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2350{
ec98f782 2351 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2352 struct page **pages;
2353 int i;
05d1c7c0 2354
ec98f782 2355 BUG_ON(!sg);
05d1c7c0 2356 /*
ec98f782
AG		 2357 * We need to take into account a possible offset here for fabrics like
2358 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2359 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2360 */
4949314c
AG		 2361 if (!cmd->t_data_nents)
2362 return NULL;
2363 else if (cmd->t_data_nents == 1)
2364 return kmap(sg_page(sg)) + sg->offset;
2365
2366 /* >1 page. use vmap */
2367 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2368 if (!pages)
2369 return NULL;
2370
2371 /* convert sg[] to pages[] */
2372 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2373 pages[i] = sg_page(sg);
2374 }
2375
2376 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2377 kfree(pages);
2378 if (!cmd->t_data_vmap)
2379 return NULL;
2380
2381 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2382}
4949314c 2383EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2384
4949314c 2385void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2386{
a1edf9cf 2387 if (!cmd->t_data_nents) {
4949314c 2388 return;
a1edf9cf 2389 } else if (cmd->t_data_nents == 1) {
4949314c 2390 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2391 return;
2392 }
4949314c
AG		 2393
2394 vunmap(cmd->t_data_vmap);
2395 cmd->t_data_vmap = NULL;
05d1c7c0 2396}
4949314c 2397EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2398
c66ac9db 2399static int
05d1c7c0 2400transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2401{
ec98f782
AG		 2402 u32 length = cmd->data_length;
2403 unsigned int nents;
2404 struct page *page;
9db9da33 2405 gfp_t zero_flag;
ec98f782 2406 int i = 0;
c66ac9db 2407
ec98f782
AG		 2408 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2409 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2410 if (!cmd->t_data_sg)
2411 return -ENOMEM;
c66ac9db 2412
ec98f782
AG		 2413 cmd->t_data_nents = nents;
2414 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2415
64f1db38 2416 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2417
ec98f782
AG		 2418 while (length) {
2419 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2420 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2421 if (!page)
2422 goto out;
c66ac9db 2423
ec98f782
AG		 2424 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2425 length -= page_len;
2426 i++;
c66ac9db 2427 }
c66ac9db 2428 return 0;
c66ac9db 2429
ec98f782
AG		 2430out:
2431 while (i >= 0) {
2432 __free_page(sg_page(&cmd->t_data_sg[i]));
2433 i--;
c66ac9db 2434 }
ec98f782
AG		 2435 kfree(cmd->t_data_sg);
2436 cmd->t_data_sg = NULL;
2437 return -ENOMEM;
c66ac9db
NB		 2438}
2439
da0f7619 2440/*
b16a35b0
AG		 2441 * Allocate any required resources to execute the command. For writes we
2442 * might not have the payload yet, so notify the fabric via a call to
2443 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2444 */
a1d8b49a 2445int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2446{
c66ac9db
NB		 2447 int ret = 0;
2448
2449 /*
2450 * Determine is the TCM fabric module has already allocated physical
2451 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2452 * beforehand.
c66ac9db 2453 */
ec98f782
AG		 2454 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2455 cmd->data_length) {
05d1c7c0 2456 ret = transport_generic_get_mem(cmd);
c66ac9db 2457 if (ret < 0)
03e98c9e 2458 goto out_fail;
c66ac9db 2459 }
da0f7619 2460
4101f0a8 2461 /* Workaround for handling zero-length control CDBs */
64f1db38 2462 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
7d680f3b 2463 spin_lock_irq(&cmd->t_state_lock);
410f6702 2464 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 2465 cmd->transport_state |= CMD_T_ACTIVE;
2466 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 2467
2468 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2469 u8 ua_asc = 0, ua_ascq = 0;
2470
2471 core_scsi3_ua_clear_for_request_sense(cmd,
2472 &ua_asc, &ua_ascq);
2473 }
2474
410f6702
RD		 2475 INIT_WORK(&cmd->work, target_complete_ok_work);
2476 queue_work(target_completion_wq, &cmd->work);
2477 return 0;
2478 }
da0f7619 2479
4101f0a8 2480 atomic_inc(&cmd->t_fe_count);
4101f0a8 2481
c66ac9db 2482 /*
5787cacd
CH		 2483 * For WRITEs, let the fabric know its buffer is ready.
2484 *
2485 * The command will be added to the execution queue after its write
2486 * data has arrived.
5f41a31d 2487 *
5787cacd 2488 * Everything else but a WRITE, add the command to the execution queue.
c66ac9db 2489 */
5f41a31d
CH		 2490 target_add_to_state_list(cmd);
2491 if (cmd->data_direction == DMA_TO_DEVICE)
2492 return transport_generic_write_pending(cmd);
2493 target_execute_cmd(cmd);
c66ac9db 2494 return 0;
da0f7619
CH		 2495
2496out_fail:
2497 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2498 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2499 return -EINVAL;
c66ac9db 2500}
a1d8b49a 2501EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 2502
2503/* transport_generic_process_write():
2504 *
2505 *
2506 */
2507void transport_generic_process_write(struct se_cmd *cmd)
2508{
5f41a31d 2509 target_execute_cmd(cmd);
c66ac9db
NB		 2510}
2511EXPORT_SYMBOL(transport_generic_process_write);
2512
e057f533 2513static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2514{
f147abb4
NB		 2515 int ret;
2516
2517 ret = cmd->se_tfo->write_pending(cmd);
2518 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2519 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2520 cmd);
2521 transport_handle_queue_full(cmd, cmd->se_dev);
2522 }
07bde79a
NB		 2523}
2524
c66ac9db
NB		 2525static int transport_generic_write_pending(struct se_cmd *cmd)
2526{
2527 unsigned long flags;
2528 int ret;
2529
a1d8b49a 2530 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2531 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 2532 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 2533
c66ac9db
NB		 2534 /*
2535 * Clear the se_cmd for WRITE_PENDING status in order to set
7d680f3b
CH		 2536 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
2537 * from HW target mode interrupt code. This is safe to be called
f7113a47 2538 * with remove_from_lists false before the cmd->se_tfo->write_pending
c66ac9db
NB		 2539 * because the se_cmd->se_lun pointer is not being cleared.
2540 */
f7113a47 2541 transport_cmd_check_stop(cmd, false);
c66ac9db
NB		 2542
2543 /*
2544 * Call the fabric write_pending function here to let the
2545 * frontend know that WRITE buffers are ready.
2546 */
e3d6f909 2547 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 2548 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 2549 goto queue_full;
2550 else if (ret < 0)
c66ac9db
NB		 2551 return ret;
2552
03e98c9e 2553 return 1;
07bde79a
NB		 2554
2555queue_full:
6708bb27 2556 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 2557 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 2558 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 2559 return 0;
c66ac9db
NB		 2560}
2561
39c05f32 2562void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2563{
d14921d6 2564 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2565 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2566 transport_wait_for_tasks(cmd);
2567
35462975 2568 transport_release_cmd(cmd);
d14921d6
NB		 2569 } else {
2570 if (wait_for_tasks)
2571 transport_wait_for_tasks(cmd);
2572
c66ac9db
NB		 2573 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2574
82f1c8a4 2575 if (cmd->se_lun)
c66ac9db 2576 transport_lun_remove_cmd(cmd);
c66ac9db 2577
39c05f32 2578 transport_put_cmd(cmd);
c66ac9db
NB		 2579 }
2580}
2581EXPORT_SYMBOL(transport_generic_free_cmd);
2582
a17f091d
NB		 2583/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2584 * @se_sess: session to reference
2585 * @se_cmd: command descriptor to add
a6360785 2586 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2587 */
a6360785
NB		 2588void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2589 bool ack_kref)
a17f091d
NB		 2590{
2591 unsigned long flags;
2592
7481deb4 2593 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2594 /*
2595 * Add a second kref if the fabric caller is expecting to handle
2596 * fabric acknowledgement that requires two target_put_sess_cmd()
2597 * invocations before se_cmd descriptor release.
2598 */
86715569 2599 if (ack_kref == true) {
a6360785 2600 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2601 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2602 }
7481deb4 2603
a17f091d
NB		 2604 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2605 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2606 se_cmd->check_release = 1;
2607 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2608}
2609EXPORT_SYMBOL(target_get_sess_cmd);
2610
7481deb4 2611static void target_release_cmd_kref(struct kref *kref)
a17f091d 2612{
7481deb4
NB		 2613 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2614 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2615 unsigned long flags;
2616
2617 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2618 if (list_empty(&se_cmd->se_cmd_list)) {
2619 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2620 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2621 return;
a17f091d 2622 }
a17f091d
NB		 2623 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2624 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2625 complete(&se_cmd->cmd_wait_comp);
7481deb4 2626 return;
a17f091d
NB		 2627 }
2628 list_del(&se_cmd->se_cmd_list);
2629 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2630
7481deb4
NB		 2631 se_cmd->se_tfo->release_cmd(se_cmd);
2632}
2633
2634/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2635 * @se_sess: session to reference
2636 * @se_cmd: command descriptor to drop
2637 */
2638int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2639{
2640 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2641}
2642EXPORT_SYMBOL(target_put_sess_cmd);
2643
2644/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
2645 * @se_sess: session to split
2646 */
2647void target_splice_sess_cmd_list(struct se_session *se_sess)
2648{
2649 struct se_cmd *se_cmd;
2650 unsigned long flags;
2651
2652 WARN_ON(!list_empty(&se_sess->sess_wait_list));
2653 INIT_LIST_HEAD(&se_sess->sess_wait_list);
2654
2655 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2656 se_sess->sess_tearing_down = 1;
2657
2658 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2659
2660 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2661 se_cmd->cmd_wait_set = 1;
2662
2663 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2664}
2665EXPORT_SYMBOL(target_splice_sess_cmd_list);
2666
2667/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2668 * @se_sess: session to wait for active I/O
2669 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2670 */
2671void target_wait_for_sess_cmds(
2672 struct se_session *se_sess,
2673 int wait_for_tasks)
2674{
2675 struct se_cmd *se_cmd, *tmp_cmd;
2676 bool rc = false;
2677
2678 list_for_each_entry_safe(se_cmd, tmp_cmd,
2679 &se_sess->sess_wait_list, se_cmd_list) {
2680 list_del(&se_cmd->se_cmd_list);
2681
2682 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2683 " %d\n", se_cmd, se_cmd->t_state,
2684 se_cmd->se_tfo->get_cmd_state(se_cmd));
2685
2686 if (wait_for_tasks) {
2687 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2688 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2689 se_cmd->se_tfo->get_cmd_state(se_cmd));
2690
2691 rc = transport_wait_for_tasks(se_cmd);
2692
2693 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2694 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2695 se_cmd->se_tfo->get_cmd_state(se_cmd));
2696 }
2697
2698 if (!rc) {
2699 wait_for_completion(&se_cmd->cmd_wait_comp);
2700 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2701 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2702 se_cmd->se_tfo->get_cmd_state(se_cmd));
2703 }
2704
2705 se_cmd->se_tfo->release_cmd(se_cmd);
2706 }
2707}
2708EXPORT_SYMBOL(target_wait_for_sess_cmds);
2709
c66ac9db
NB		 2710/* transport_lun_wait_for_tasks():
2711 *
2712 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2713 * an struct se_lun to be successfully shutdown.
2714 */
2715static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2716{
2717 unsigned long flags;
cf572a96
CH		 2718 int ret = 0;
2719
c66ac9db
NB		 2720 /*
2721 * If the frontend has already requested this struct se_cmd to
2722 * be stopped, we can safely ignore this struct se_cmd.
2723 */
a1d8b49a 2724 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2725 if (cmd->transport_state & CMD_T_STOP) {
2726 cmd->transport_state &= ~CMD_T_LUN_STOP;
2727
2728 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2729 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2730 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2731 transport_cmd_check_stop(cmd, false);
e3d6f909 2732 return -EPERM;
c66ac9db 2733 }
7d680f3b 2734 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2735 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2736
5951146d 2737 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 2738
cf572a96
CH		 2739 // XXX: audit task_flags checks.
2740 spin_lock_irqsave(&cmd->t_state_lock, flags);
2741 if ((cmd->transport_state & CMD_T_BUSY) &&
2742 (cmd->transport_state & CMD_T_SENT)) {
2743 if (!target_stop_cmd(cmd, &flags))
2744 ret++;
cf572a96 2745 }
5f41a31d 2746 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2747
785fdf70
CH		 2748 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2749 " %d\n", cmd, ret);
c66ac9db 2750 if (!ret) {
6708bb27 2751 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2752 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2753 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2754 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2755 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2756 }
3df8d40b 2757 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 2758
2759 return 0;
2760}
2761
c66ac9db
NB		 2762static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2763{
2764 struct se_cmd *cmd = NULL;
2765 unsigned long lun_flags, cmd_flags;
2766 /*
2767 * Do exception processing and return CHECK_CONDITION status to the
2768 * Initiator Port.
2769 */
2770 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2771 while (!list_empty(&lun->lun_cmd_list)) {
2772 cmd = list_first_entry(&lun->lun_cmd_list,
2773 struct se_cmd, se_lun_node);
3d26fea0 2774 list_del_init(&cmd->se_lun_node);
5951146d 2775
a1d8b49a 2776 spin_lock(&cmd->t_state_lock);
6708bb27 2777 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2778 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2779 cmd->se_lun->unpacked_lun,
2780 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2781 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2782 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2783
2784 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2785
6708bb27
AG		 2786 if (!cmd->se_lun) {
2787 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2788 cmd->se_tfo->get_task_tag(cmd),
2789 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2790 BUG();
2791 }
2792 /*
2793 * If the Storage engine still owns the iscsi_cmd_t, determine
2794 * and/or stop its context.
2795 */
6708bb27 2796 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2797 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2798 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2799
e3d6f909 2800 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2801 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2802 continue;
2803 }
2804
6708bb27 2805 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2806 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2807 cmd->se_lun->unpacked_lun,
2808 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2809
a1d8b49a 2810 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2811 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2812 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2813 goto check_cond;
2814 }
7d680f3b 2815 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2816 target_remove_from_state_list(cmd);
a1d8b49a 2817 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2818
c66ac9db
NB		 2819 /*
2820 * The Storage engine stopped this struct se_cmd before it was
2821 * send to the fabric frontend for delivery back to the
2822 * Initiator Node. Return this SCSI CDB back with an
2823 * CHECK_CONDITION status.
2824 */
2825check_cond:
2826 transport_send_check_condition_and_sense(cmd,
2827 TCM_NON_EXISTENT_LUN, 0);
2828 /*
2829 * If the fabric frontend is waiting for this iscsi_cmd_t to
2830 * be released, notify the waiting thread now that LU has
2831 * finished accessing it.
2832 */
a1d8b49a 2833 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2834 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2835 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2836 " struct se_cmd: %p ITT: 0x%08x\n",
2837 lun->unpacked_lun,
e3d6f909 2838 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2839
a1d8b49a 2840 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2841 cmd_flags);
f7113a47 2842 transport_cmd_check_stop(cmd, false);
a1d8b49a 2843 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2844 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2845 continue;
2846 }
6708bb27 2847 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2848 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2849
a1d8b49a 2850 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2851 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2852 }
2853 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2854}
2855
2856static int transport_clear_lun_thread(void *p)
2857{
8359cf43 2858 struct se_lun *lun = p;
c66ac9db
NB		 2859
2860 __transport_clear_lun_from_sessions(lun);
2861 complete(&lun->lun_shutdown_comp);
2862
2863 return 0;
2864}
2865
2866int transport_clear_lun_from_sessions(struct se_lun *lun)
2867{
2868 struct task_struct *kt;
2869
5951146d 2870 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2871 "tcm_cl_%u", lun->unpacked_lun);
2872 if (IS_ERR(kt)) {
6708bb27 2873 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2874 return PTR_ERR(kt);
c66ac9db
NB		 2875 }
2876 wait_for_completion(&lun->lun_shutdown_comp);
2877
2878 return 0;
2879}
2880
d14921d6
NB		 2881/**
2882 * transport_wait_for_tasks - wait for completion to occur
2883 * @cmd: command to wait
c66ac9db 2884 *
d14921d6
NB		 2885 * Called from frontend fabric context to wait for storage engine
2886 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2887 */
a17f091d 2888bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2889{
2890 unsigned long flags;
2891
a1d8b49a 2892 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2893 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2894 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2895 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2896 return false;
d14921d6 2897 }
cb4f4d3c 2898
c8e31f26
AG		 2899 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2900 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2901 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2902 return false;
d14921d6 2903 }
c66ac9db
NB		 2904 /*
2905 * If we are already stopped due to an external event (ie: LUN shutdown)
2906 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2907 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2908 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2909 * has completed its operation on the struct se_cmd.
2910 */
7d680f3b 2911 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2912 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2913 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2914 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2915 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2916 /*
2917 * There is a special case for WRITES where a FE exception +
2918 * LUN shutdown means ConfigFS context is still sleeping on
2919 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2920 * We go ahead and up transport_lun_stop_comp just to be sure
2921 * here.
2922 */
a1d8b49a
AG		 2923 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2924 complete(&cmd->transport_lun_stop_comp);
2925 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2926 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2927
cf572a96 2928 target_remove_from_state_list(cmd);
c66ac9db
NB		 2929 /*
2930 * At this point, the frontend who was the originator of this
2931 * struct se_cmd, now owns the structure and can be released through
2932 * normal means below.
2933 */
6708bb27 2934 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2935 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2936 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2937 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2938
7d680f3b 2939 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2940 }
7d680f3b 2941
3d28934a 2942 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2943 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2944 return false;
d14921d6 2945 }
c66ac9db 2946
7d680f3b 2947 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2948
6708bb27 2949 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2950 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2951 cmd, cmd->se_tfo->get_task_tag(cmd),
2952 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2953
a1d8b49a 2954 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2955
5951146d 2956 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 2957
a1d8b49a 2958 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2959
a1d8b49a 2960 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2961 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2962
6708bb27 2963 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 2964 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2965 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2966
d14921d6 2967 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2968
2969 return true;
c66ac9db 2970}
d14921d6 2971EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2972
2973static int transport_get_sense_codes(
2974 struct se_cmd *cmd,
2975 u8 *asc,
2976 u8 *ascq)
2977{
2978 *asc = cmd->scsi_asc;
2979 *ascq = cmd->scsi_ascq;
2980
2981 return 0;
2982}
2983
2984static int transport_set_sense_codes(
2985 struct se_cmd *cmd,
2986 u8 asc,
2987 u8 ascq)
2988{
2989 cmd->scsi_asc = asc;
2990 cmd->scsi_ascq = ascq;
2991
2992 return 0;
2993}
2994
2995int transport_send_check_condition_and_sense(
2996 struct se_cmd *cmd,
2997 u8 reason,
2998 int from_transport)
2999{
3000 unsigned char *buffer = cmd->sense_buffer;
3001 unsigned long flags;
3002 int offset;
3003 u8 asc = 0, ascq = 0;
3004
a1d8b49a 3005 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3006 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 3007 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3008 return 0;
3009 }
3010 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 3011 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3012
3013 if (!reason && from_transport)
3014 goto after_reason;
3015
3016 if (!from_transport)
3017 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
3018 /*
3019 * Data Segment and SenseLength of the fabric response PDU.
3020 *
3021 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
3022 * from include/scsi/scsi_cmnd.h
3023 */
e3d6f909 3024 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 3025 TRANSPORT_SENSE_BUFFER);
3026 /*
3027 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
3028 * SENSE KEY values from include/scsi/scsi.h
3029 */
3030 switch (reason) {
3031 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 3032 /* CURRENT ERROR */
3033 buffer[offset] = 0x70;
895f3022 3034 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 3035 /* ILLEGAL REQUEST */
3036 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3037 /* LOGICAL UNIT NOT SUPPORTED */
3038 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
3039 break;
c66ac9db
NB		 3040 case TCM_UNSUPPORTED_SCSI_OPCODE:
3041 case TCM_SECTOR_COUNT_TOO_MANY:
3042 /* CURRENT ERROR */
3043 buffer[offset] = 0x70;
895f3022 3044 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3045 /* ILLEGAL REQUEST */
3046 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3047 /* INVALID COMMAND OPERATION CODE */
3048 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
3049 break;
3050 case TCM_UNKNOWN_MODE_PAGE:
3051 /* CURRENT ERROR */
3052 buffer[offset] = 0x70;
895f3022 3053 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3054 /* ILLEGAL REQUEST */
3055 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3056 /* INVALID FIELD IN CDB */
3057 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
3058 break;
3059 case TCM_CHECK_CONDITION_ABORT_CMD:
3060 /* CURRENT ERROR */
3061 buffer[offset] = 0x70;
895f3022 3062 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3063 /* ABORTED COMMAND */
3064 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3065 /* BUS DEVICE RESET FUNCTION OCCURRED */
3066 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
3067 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
3068 break;
3069 case TCM_INCORRECT_AMOUNT_OF_DATA:
3070 /* CURRENT ERROR */
3071 buffer[offset] = 0x70;
895f3022 3072 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3073 /* ABORTED COMMAND */
3074 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3075 /* WRITE ERROR */
3076 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
3077 /* NOT ENOUGH UNSOLICITED DATA */
3078 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
3079 break;
3080 case TCM_INVALID_CDB_FIELD:
3081 /* CURRENT ERROR */
3082 buffer[offset] = 0x70;
895f3022 3083 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 3084 /* ILLEGAL REQUEST */
3085 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 3086 /* INVALID FIELD IN CDB */
3087 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
3088 break;
3089 case TCM_INVALID_PARAMETER_LIST:
3090 /* CURRENT ERROR */
3091 buffer[offset] = 0x70;
895f3022 3092 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 3093 /* ILLEGAL REQUEST */
3094 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 3095 /* INVALID FIELD IN PARAMETER LIST */
3096 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
3097 break;
3098 case TCM_UNEXPECTED_UNSOLICITED_DATA:
3099 /* CURRENT ERROR */
3100 buffer[offset] = 0x70;
895f3022 3101 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3102 /* ABORTED COMMAND */
3103 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3104 /* WRITE ERROR */
3105 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
3106 /* UNEXPECTED_UNSOLICITED_DATA */
3107 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
3108 break;
3109 case TCM_SERVICE_CRC_ERROR:
3110 /* CURRENT ERROR */
3111 buffer[offset] = 0x70;
895f3022 3112 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3113 /* ABORTED COMMAND */
3114 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3115 /* PROTOCOL SERVICE CRC ERROR */
3116 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
3117 /* N/A */
3118 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
3119 break;
3120 case TCM_SNACK_REJECTED:
3121 /* CURRENT ERROR */
3122 buffer[offset] = 0x70;
895f3022 3123 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3124 /* ABORTED COMMAND */
3125 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3126 /* READ ERROR */
3127 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
3128 /* FAILED RETRANSMISSION REQUEST */
3129 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
3130 break;
3131 case TCM_WRITE_PROTECTED:
3132 /* CURRENT ERROR */
3133 buffer[offset] = 0x70;
895f3022 3134 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3135 /* DATA PROTECT */
3136 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
3137 /* WRITE PROTECTED */
3138 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
3139 break;
3140 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
3141 /* CURRENT ERROR */
3142 buffer[offset] = 0x70;
895f3022 3143 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3144 /* UNIT ATTENTION */
3145 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
3146 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3147 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3148 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3149 break;
3150 case TCM_CHECK_CONDITION_NOT_READY:
3151 /* CURRENT ERROR */
3152 buffer[offset] = 0x70;
895f3022 3153 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3154 /* Not Ready */
3155 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3156 transport_get_sense_codes(cmd, &asc, &ascq);
3157 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3158 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3159 break;
3160 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3161 default:
3162 /* CURRENT ERROR */
3163 buffer[offset] = 0x70;
895f3022 3164 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3165 /* ILLEGAL REQUEST */
3166 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3167 /* LOGICAL UNIT COMMUNICATION FAILURE */
3168 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3169 break;
3170 }
3171 /*
3172 * This code uses linux/include/scsi/scsi.h SAM status codes!
3173 */
3174 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3175 /*
3176 * Automatically padded, this value is encoded in the fabric's
3177 * data_length response PDU containing the SCSI defined sense data.
3178 */
3179 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3180
3181after_reason:
07bde79a 3182 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3183}
3184EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3185
3186int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3187{
3188 int ret = 0;
3189
7d680f3b 3190 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 3191 if (!send_status ||
c66ac9db
NB		 3192 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3193 return 1;
8b1e1244 3194
6708bb27 3195 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 3196 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 3197 cmd->t_task_cdb[0],
e3d6f909 3198 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3199
c66ac9db 3200 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 3201 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3202 ret = 1;
3203 }
3204 return ret;
3205}
3206EXPORT_SYMBOL(transport_check_aborted_status);
3207
3208void transport_send_task_abort(struct se_cmd *cmd)
3209{
c252f003
NB		 3210 unsigned long flags;
3211
3212 spin_lock_irqsave(&cmd->t_state_lock, flags);
3213 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3214 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3215 return;
3216 }
3217 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3218
c66ac9db
NB		 3219 /*
3220 * If there are still expected incoming fabric WRITEs, we wait
3221 * until until they have completed before sending a TASK_ABORTED
3222 * response. This response with TASK_ABORTED status will be
3223 * queued back to fabric module by transport_check_aborted_status().
3224 */
3225 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3226 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 3227 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 3228 smp_mb__after_atomic_inc();
c66ac9db
NB		 3229 }
3230 }
3231 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3232
6708bb27 3233 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 3234 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 3235 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3236
e3d6f909 3237 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3238}
3239
e26d99ae 3240static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 3241{
5951146d 3242 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3243 struct se_tmr_req *tmr = cmd->se_tmr_req;
3244 int ret;
3245
3246 switch (tmr->function) {
5c6cd613 3247 case TMR_ABORT_TASK:
3d28934a 3248 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3249 break;
5c6cd613
NB		 3250 case TMR_ABORT_TASK_SET:
3251 case TMR_CLEAR_ACA:
3252 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3253 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3254 break;
5c6cd613 3255 case TMR_LUN_RESET:
c66ac9db
NB		 3256 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3257 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3258 TMR_FUNCTION_REJECTED;
3259 break;
5c6cd613 3260 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3261 tmr->response = TMR_FUNCTION_REJECTED;
3262 break;
5c6cd613 3263 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3264 tmr->response = TMR_FUNCTION_REJECTED;
3265 break;
c66ac9db 3266 default:
6708bb27 3267 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3268 tmr->function);
3269 tmr->response = TMR_FUNCTION_REJECTED;
3270 break;
3271 }
3272
3273 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3274 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3275
b7b8bef7 3276 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3277 return 0;
3278}
3279
c66ac9db
NB		 3280/* transport_processing_thread():
3281 *
3282 *
3283 */
3284static int transport_processing_thread(void *param)
3285{
5951146d 3286 int ret;
c66ac9db 3287 struct se_cmd *cmd;
8359cf43 3288 struct se_device *dev = param;
c66ac9db 3289
c66ac9db 3290 while (!kthread_should_stop()) {
e3d6f909
AG		 3291 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
3292 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 3293 kthread_should_stop());
3294 if (ret < 0)
3295 goto out;
3296
c66ac9db 3297get_cmd:
5951146d
AG		 3298 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
3299 if (!cmd)
c66ac9db
NB		 3300 continue;
3301
5951146d 3302 switch (cmd->t_state) {
680b73c5
CH		 3303 case TRANSPORT_NEW_CMD:
3304 BUG();
3305 break;
c66ac9db 3306 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 3307 if (!cmd->se_tfo->new_cmd_map) {
3308 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 3309 " NULL for TRANSPORT_NEW_CMD_MAP\n");
3310 BUG();
3311 }
e3d6f909 3312 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 3313 if (ret < 0) {
03e98c9e 3314 transport_generic_request_failure(cmd);
c66ac9db
NB		 3315 break;
3316 }
c66ac9db 3317 ret = transport_generic_new_cmd(cmd);
f147abb4 3318 if (ret < 0) {
03e98c9e
NB		 3319 transport_generic_request_failure(cmd);
3320 break;
c66ac9db
NB		 3321 }
3322 break;
3323 case TRANSPORT_PROCESS_WRITE:
3324 transport_generic_process_write(cmd);
3325 break;
c66ac9db
NB		 3326 case TRANSPORT_PROCESS_TMR:
3327 transport_generic_do_tmr(cmd);
3328 break;
07bde79a 3329 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 3330 transport_write_pending_qf(cmd);
3331 break;
3332 case TRANSPORT_COMPLETE_QF_OK:
3333 transport_complete_qf(cmd);
07bde79a 3334 break;
c66ac9db 3335 default:
f2da9dbd
CH		 3336 pr_err("Unknown t_state: %d for ITT: 0x%08x "
3337 "i_state: %d on SE LUN: %u\n",
3338 cmd->t_state,
e3d6f909
AG		 3339 cmd->se_tfo->get_task_tag(cmd),
3340 cmd->se_tfo->get_cmd_state(cmd),
3341 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 3342 BUG();
3343 }
3344
3345 goto get_cmd;
3346 }
3347
3348out:
cf572a96 3349 WARN_ON(!list_empty(&dev->state_list));
ce8762f6 3350 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 3351 dev->process_thread = NULL;
3352 return 0;
3353}
kernel source for telekom puls (alcatel/mediatek)