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target: move transport_get_sense_data
[GitHub/exynos8895/android_kernel_samsung_universal8895.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 void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 70static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 71 struct se_device *dev);
05d1c7c0 72static int transport_generic_get_mem(struct se_cmd *cmd);
bc187ea6 73static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
39c05f32 74static void transport_put_cmd(struct se_cmd *cmd);
c66ac9db 75static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757 76static void target_complete_ok_work(struct work_struct *work);
c66ac9db 77
e3d6f909 78int init_se_kmem_caches(void)
c66ac9db 79{
c66ac9db
NB		 80 se_sess_cache = kmem_cache_create("se_sess_cache",
81 sizeof(struct se_session), __alignof__(struct se_session),
82 0, NULL);
6708bb27
AG		 83 if (!se_sess_cache) {
84 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 85 " failed\n");
c8e31f26 86 goto out;
c66ac9db
NB		 87 }
88 se_ua_cache = kmem_cache_create("se_ua_cache",
89 sizeof(struct se_ua), __alignof__(struct se_ua),
90 0, NULL);
6708bb27
AG		 91 if (!se_ua_cache) {
92 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 93 goto out_free_sess_cache;
c66ac9db 94 }
c66ac9db
NB		 95 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
96 sizeof(struct t10_pr_registration),
97 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 98 if (!t10_pr_reg_cache) {
99 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 100 " failed\n");
35e0e757 101 goto out_free_ua_cache;
c66ac9db
NB		 102 }
103 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
104 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
105 0, NULL);
6708bb27
AG		 106 if (!t10_alua_lu_gp_cache) {
107 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 108 " failed\n");
35e0e757 109 goto out_free_pr_reg_cache;
c66ac9db
NB		 110 }
111 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
112 sizeof(struct t10_alua_lu_gp_member),
113 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 114 if (!t10_alua_lu_gp_mem_cache) {
115 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 116 "cache failed\n");
35e0e757 117 goto out_free_lu_gp_cache;
c66ac9db
NB		 118 }
119 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
120 sizeof(struct t10_alua_tg_pt_gp),
121 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 122 if (!t10_alua_tg_pt_gp_cache) {
123 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 124 "cache failed\n");
35e0e757 125 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 126 }
127 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
128 "t10_alua_tg_pt_gp_mem_cache",
129 sizeof(struct t10_alua_tg_pt_gp_member),
130 __alignof__(struct t10_alua_tg_pt_gp_member),
131 0, NULL);
6708bb27
AG		 132 if (!t10_alua_tg_pt_gp_mem_cache) {
133 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 134 "mem_t failed\n");
35e0e757 135 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 136 }
137
35e0e757
CH		 138 target_completion_wq = alloc_workqueue("target_completion",
139 WQ_MEM_RECLAIM, 0);
140 if (!target_completion_wq)
141 goto out_free_tg_pt_gp_mem_cache;
142
c66ac9db 143 return 0;
35e0e757
CH		 144
145out_free_tg_pt_gp_mem_cache:
146 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
147out_free_tg_pt_gp_cache:
148 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
149out_free_lu_gp_mem_cache:
150 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
151out_free_lu_gp_cache:
152 kmem_cache_destroy(t10_alua_lu_gp_cache);
153out_free_pr_reg_cache:
154 kmem_cache_destroy(t10_pr_reg_cache);
155out_free_ua_cache:
156 kmem_cache_destroy(se_ua_cache);
157out_free_sess_cache:
158 kmem_cache_destroy(se_sess_cache);
c66ac9db 159out:
e3d6f909 160 return -ENOMEM;
c66ac9db
NB		 161}
162
e3d6f909 163void release_se_kmem_caches(void)
c66ac9db 164{
35e0e757 165 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 166 kmem_cache_destroy(se_sess_cache);
167 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 168 kmem_cache_destroy(t10_pr_reg_cache);
169 kmem_cache_destroy(t10_alua_lu_gp_cache);
170 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
171 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
172 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 173}
174
e3d6f909
AG		 175/* This code ensures unique mib indexes are handed out. */
176static DEFINE_SPINLOCK(scsi_mib_index_lock);
177static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 178
179/*
180 * Allocate a new row index for the entry type specified
181 */
182u32 scsi_get_new_index(scsi_index_t type)
183{
184 u32 new_index;
185
e3d6f909 186 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 187
e3d6f909
AG		 188 spin_lock(&scsi_mib_index_lock);
189 new_index = ++scsi_mib_index[type];
190 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 191
192 return new_index;
193}
194
dbc5623e 195void transport_subsystem_check_init(void)
c66ac9db
NB		 196{
197 int ret;
198
dbc5623e
NB		 199 if (sub_api_initialized)
200 return;
201
c66ac9db
NB		 202 ret = request_module("target_core_iblock");
203 if (ret != 0)
6708bb27 204 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 205
206 ret = request_module("target_core_file");
207 if (ret != 0)
6708bb27 208 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 209
210 ret = request_module("target_core_pscsi");
211 if (ret != 0)
6708bb27 212 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 213
214 ret = request_module("target_core_stgt");
215 if (ret != 0)
6708bb27 216 pr_err("Unable to load target_core_stgt\n");
c66ac9db 217
e3d6f909 218 sub_api_initialized = 1;
dbc5623e 219 return;
c66ac9db
NB		 220}
221
222struct se_session *transport_init_session(void)
223{
224 struct se_session *se_sess;
225
226 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 227 if (!se_sess) {
228 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 229 " se_sess_cache\n");
230 return ERR_PTR(-ENOMEM);
231 }
232 INIT_LIST_HEAD(&se_sess->sess_list);
233 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 234 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
a17f091d 235 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 236 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 237
238 return se_sess;
239}
240EXPORT_SYMBOL(transport_init_session);
241
242/*
140854cb 243 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 244 */
245void __transport_register_session(
246 struct se_portal_group *se_tpg,
247 struct se_node_acl *se_nacl,
248 struct se_session *se_sess,
249 void *fabric_sess_ptr)
250{
251 unsigned char buf[PR_REG_ISID_LEN];
252
253 se_sess->se_tpg = se_tpg;
254 se_sess->fabric_sess_ptr = fabric_sess_ptr;
255 /*
256 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
257 *
258 * Only set for struct se_session's that will actually be moving I/O.
259 * eg: *NOT* discovery sessions.
260 */
261 if (se_nacl) {
262 /*
263 * If the fabric module supports an ISID based TransportID,
264 * save this value in binary from the fabric I_T Nexus now.
265 */
e3d6f909 266 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 267 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 268 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 269 &buf[0], PR_REG_ISID_LEN);
270 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
271 }
afb999ff
NB		 272 kref_get(&se_nacl->acl_kref);
273
c66ac9db
NB		 274 spin_lock_irq(&se_nacl->nacl_sess_lock);
275 /*
276 * The se_nacl->nacl_sess pointer will be set to the
277 * last active I_T Nexus for each struct se_node_acl.
278 */
279 se_nacl->nacl_sess = se_sess;
280
281 list_add_tail(&se_sess->sess_acl_list,
282 &se_nacl->acl_sess_list);
283 spin_unlock_irq(&se_nacl->nacl_sess_lock);
284 }
285 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
286
6708bb27 287 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 288 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 289}
290EXPORT_SYMBOL(__transport_register_session);
291
292void transport_register_session(
293 struct se_portal_group *se_tpg,
294 struct se_node_acl *se_nacl,
295 struct se_session *se_sess,
296 void *fabric_sess_ptr)
297{
140854cb
NB		 298 unsigned long flags;
299
300 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 301 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 302 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 303}
304EXPORT_SYMBOL(transport_register_session);
305
4149268e 306void target_release_session(struct kref *kref)
41ac82b6
NB		 307{
308 struct se_session *se_sess = container_of(kref,
309 struct se_session, sess_kref);
310 struct se_portal_group *se_tpg = se_sess->se_tpg;
311
312 se_tpg->se_tpg_tfo->close_session(se_sess);
313}
314
315void target_get_session(struct se_session *se_sess)
316{
317 kref_get(&se_sess->sess_kref);
318}
319EXPORT_SYMBOL(target_get_session);
320
33933a0e 321void target_put_session(struct se_session *se_sess)
41ac82b6 322{
4149268e
JE		 323 struct se_portal_group *tpg = se_sess->se_tpg;
324
325 if (tpg->se_tpg_tfo->put_session != NULL) {
326 tpg->se_tpg_tfo->put_session(se_sess);
327 return;
328 }
33933a0e 329 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 330}
331EXPORT_SYMBOL(target_put_session);
332
afb999ff
NB		 333static void target_complete_nacl(struct kref *kref)
334{
335 struct se_node_acl *nacl = container_of(kref,
336 struct se_node_acl, acl_kref);
337
338 complete(&nacl->acl_free_comp);
339}
340
341void target_put_nacl(struct se_node_acl *nacl)
342{
343 kref_put(&nacl->acl_kref, target_complete_nacl);
344}
345
c66ac9db
NB		 346void transport_deregister_session_configfs(struct se_session *se_sess)
347{
348 struct se_node_acl *se_nacl;
23388864 349 unsigned long flags;
c66ac9db
NB		 350 /*
351 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
352 */
353 se_nacl = se_sess->se_node_acl;
6708bb27 354 if (se_nacl) {
23388864 355 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 356 if (se_nacl->acl_stop == 0)
357 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 358 /*
359 * If the session list is empty, then clear the pointer.
360 * Otherwise, set the struct se_session pointer from the tail
361 * element of the per struct se_node_acl active session list.
362 */
363 if (list_empty(&se_nacl->acl_sess_list))
364 se_nacl->nacl_sess = NULL;
365 else {
366 se_nacl->nacl_sess = container_of(
367 se_nacl->acl_sess_list.prev,
368 struct se_session, sess_acl_list);
369 }
23388864 370 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 371 }
372}
373EXPORT_SYMBOL(transport_deregister_session_configfs);
374
375void transport_free_session(struct se_session *se_sess)
376{
377 kmem_cache_free(se_sess_cache, se_sess);
378}
379EXPORT_SYMBOL(transport_free_session);
380
381void transport_deregister_session(struct se_session *se_sess)
382{
383 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 384 struct target_core_fabric_ops *se_tfo;
c66ac9db 385 struct se_node_acl *se_nacl;
e63a8e19 386 unsigned long flags;
01468346 387 bool comp_nacl = true;
c66ac9db 388
6708bb27 389 if (!se_tpg) {
c66ac9db
NB		 390 transport_free_session(se_sess);
391 return;
392 }
01468346 393 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 394
e63a8e19 395 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 396 list_del(&se_sess->sess_list);
397 se_sess->se_tpg = NULL;
398 se_sess->fabric_sess_ptr = NULL;
e63a8e19 399 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 400
401 /*
402 * Determine if we need to do extra work for this initiator node's
403 * struct se_node_acl if it had been previously dynamically generated.
404 */
405 se_nacl = se_sess->se_node_acl;
01468346
NB		 406
407 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
408 if (se_nacl && se_nacl->dynamic_node_acl) {
409 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
410 list_del(&se_nacl->acl_list);
411 se_tpg->num_node_acls--;
412 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
413 core_tpg_wait_for_nacl_pr_ref(se_nacl);
414 core_free_device_list_for_node(se_nacl, se_tpg);
415 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
416
417 comp_nacl = false;
418 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 419 }
c66ac9db 420 }
01468346 421 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 422
6708bb27 423 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 424 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 425 /*
afb999ff
NB		 426 * If last kref is dropping now for an explict NodeACL, awake sleeping
427 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
428 * removal context.
01468346
NB		 429 */
430 if (se_nacl && comp_nacl == true)
afb999ff 431 target_put_nacl(se_nacl);
01468346 432
afb999ff 433 transport_free_session(se_sess);
c66ac9db
NB		 434}
435EXPORT_SYMBOL(transport_deregister_session);
436
437/*
a1d8b49a 438 * Called with cmd->t_state_lock held.
c66ac9db 439 */
cf572a96 440static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 441{
42bf829e 442 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 443 unsigned long flags;
444
42bf829e
CH		 445 if (!dev)
446 return;
c66ac9db 447
cf572a96
CH		 448 if (cmd->transport_state & CMD_T_BUSY)
449 return;
c66ac9db 450
cf572a96
CH		 451 spin_lock_irqsave(&dev->execute_task_lock, flags);
452 if (cmd->state_active) {
453 list_del(&cmd->state_list);
cf572a96 454 cmd->state_active = false;
c66ac9db 455 }
cf572a96 456 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 457}
458
f7113a47 459static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
c66ac9db
NB		 460{
461 unsigned long flags;
462
a1d8b49a 463 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 464 /*
465 * Determine if IOCTL context caller in requesting the stopping of this
466 * command for LUN shutdown purposes.
467 */
7d680f3b
CH		 468 if (cmd->transport_state & CMD_T_LUN_STOP) {
469 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
470 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 471
7d680f3b 472 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 473 if (remove_from_lists)
cf572a96 474 target_remove_from_state_list(cmd);
a1d8b49a 475 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 476
a1d8b49a 477 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 478 return 1;
479 }
f7113a47
CH		 480
481 if (remove_from_lists) {
482 target_remove_from_state_list(cmd);
483
484 /*
485 * Clear struct se_cmd->se_lun before the handoff to FE.
486 */
487 cmd->se_lun = NULL;
488 }
489
c66ac9db
NB		 490 /*
491 * Determine if frontend context caller is requesting the stopping of
e3d6f909 492 * this command for frontend exceptions.
c66ac9db 493 */
7d680f3b
CH		 494 if (cmd->transport_state & CMD_T_STOP) {
495 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
496 __func__, __LINE__,
e3d6f909 497 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 498
a1d8b49a 499 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 500
a1d8b49a 501 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 502 return 1;
503 }
f7113a47
CH		 504
505 cmd->transport_state &= ~CMD_T_ACTIVE;
506 if (remove_from_lists) {
507 /*
508 * Some fabric modules like tcm_loop can release
509 * their internally allocated I/O reference now and
510 * struct se_cmd now.
511 *
512 * Fabric modules are expected to return '1' here if the
513 * se_cmd being passed is released at this point,
514 * or zero if not being released.
515 */
516 if (cmd->se_tfo->check_stop_free != NULL) {
517 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
518 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 519 }
f7113a47 520 }
c66ac9db 521
a1d8b49a 522 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 523 return 0;
524}
525
526static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
527{
f7113a47 528 return transport_cmd_check_stop(cmd, true);
c66ac9db
NB		 529}
530
531static void transport_lun_remove_cmd(struct se_cmd *cmd)
532{
e3d6f909 533 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 534 unsigned long flags;
535
536 if (!lun)
537 return;
538
a1d8b49a 539 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 540 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
541 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 542 target_remove_from_state_list(cmd);
c66ac9db 543 }
a1d8b49a 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 545
c66ac9db 546 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 547 if (!list_empty(&cmd->se_lun_node))
548 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 549 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
550}
551
552void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
553{
c8e31f26 554 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 555 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 556
557 if (transport_cmd_check_stop_to_fabric(cmd))
558 return;
af877292 559 if (remove)
e6a2573f 560 transport_put_cmd(cmd);
c66ac9db
NB		 561}
562
35e0e757
CH		 563static void target_complete_failure_work(struct work_struct *work)
564{
565 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
566
03e98c9e 567 transport_generic_request_failure(cmd);
35e0e757
CH		 568}
569
6138ed2a
PB		 570/*
571 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
572 */
573static int transport_get_sense_data(struct se_cmd *cmd)
574{
575 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
576 struct se_device *dev = cmd->se_dev;
577 unsigned long flags;
578 u32 offset = 0;
579
580 WARN_ON(!cmd->se_lun);
581
582 if (!dev)
583 return 0;
584
585 spin_lock_irqsave(&cmd->t_state_lock, flags);
586 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
587 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
588 return 0;
589 }
590
591 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
592 goto out;
593
594 if (!dev->transport->get_sense_buffer) {
595 pr_err("dev->transport->get_sense_buffer is NULL\n");
596 goto out;
597 }
598
599 sense_buffer = dev->transport->get_sense_buffer(cmd);
600 if (!sense_buffer) {
601 pr_err("ITT 0x%08x cmd %p: Unable to locate"
602 " sense buffer for task with sense\n",
603 cmd->se_tfo->get_task_tag(cmd), cmd);
604 goto out;
605 }
606
607 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
608
609 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
610
611 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
612
613 /* Automatically padded */
614 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
615
616 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
617 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
618 return 0;
619
620out:
621 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
622 return -1;
623}
624
5787cacd 625void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 626{
42bf829e 627 struct se_device *dev = cmd->se_dev;
5787cacd 628 int success = scsi_status == GOOD;
c66ac9db 629 unsigned long flags;
c66ac9db 630
5787cacd
CH		 631 cmd->scsi_status = scsi_status;
632
633
a1d8b49a 634 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 635 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 636
c66ac9db 637 if (dev && dev->transport->transport_complete) {
5787cacd
CH		 638 if (dev->transport->transport_complete(cmd,
639 cmd->t_data_sg) != 0) {
c66ac9db 640 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
c66ac9db
NB		 641 success = 1;
642 }
643 }
644
645 /*
5787cacd 646 * See if we are waiting to complete for an exception condition.
c66ac9db 647 */
cf572a96 648 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 649 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 650 complete(&cmd->task_stop_comp);
c66ac9db
NB		 651 return;
652 }
2235007c
CH		 653
654 if (!success)
7d680f3b 655 cmd->transport_state |= CMD_T_FAILED;
2235007c 656
3d28934a
NB		 657 /*
658 * Check for case where an explict ABORT_TASK has been received
659 * and transport_wait_for_tasks() will be waiting for completion..
660 */
661 if (cmd->transport_state & CMD_T_ABORTED &&
662 cmd->transport_state & CMD_T_STOP) {
663 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
664 complete(&cmd->t_transport_stop_comp);
665 return;
666 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 667 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 668 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 669 } else {
35e0e757 670 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 671 }
35e0e757 672
35e0e757 673 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 674 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 675 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 676
35e0e757 677 queue_work(target_completion_wq, &cmd->work);
c66ac9db 678}
6bb35e00
CH		 679EXPORT_SYMBOL(target_complete_cmd);
680
cf572a96 681static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 682{
cf572a96
CH		 683 struct se_device *dev = cmd->se_dev;
684 unsigned long flags;
c66ac9db 685
cf572a96
CH		 686 spin_lock_irqsave(&dev->execute_task_lock, flags);
687 if (!cmd->state_active) {
688 list_add_tail(&cmd->state_list, &dev->state_list);
689 cmd->state_active = true;
c66ac9db 690 }
cf572a96 691 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 692}
693
07bde79a 694/*
f147abb4 695 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 696 */
7a6f0a1e
CH		 697static void transport_write_pending_qf(struct se_cmd *cmd);
698static void transport_complete_qf(struct se_cmd *cmd);
07bde79a
NB		 699
700static void target_qf_do_work(struct work_struct *work)
701{
702 struct se_device *dev = container_of(work, struct se_device,
703 qf_work_queue);
bcac364a 704 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 705 struct se_cmd *cmd, *cmd_tmp;
706
707 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 708 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
709 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 710
bcac364a 711 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 712 list_del(&cmd->se_qf_node);
713 atomic_dec(&dev->dev_qf_count);
714 smp_mb__after_atomic_dec();
07bde79a 715
6708bb27 716 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 717 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 718 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 719 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
720 : "UNKNOWN");
f7a5cc0b 721
7a6f0a1e
CH		 722 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
723 transport_write_pending_qf(cmd);
724 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
725 transport_complete_qf(cmd);
07bde79a 726 }
07bde79a
NB		 727}
728
c66ac9db
NB		 729unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
730{
731 switch (cmd->data_direction) {
732 case DMA_NONE:
733 return "NONE";
734 case DMA_FROM_DEVICE:
735 return "READ";
736 case DMA_TO_DEVICE:
737 return "WRITE";
738 case DMA_BIDIRECTIONAL:
739 return "BIDI";
740 default:
741 break;
742 }
743
744 return "UNKNOWN";
745}
746
747void transport_dump_dev_state(
748 struct se_device *dev,
749 char *b,
750 int *bl)
751{
752 *bl += sprintf(b + *bl, "Status: ");
753 switch (dev->dev_status) {
754 case TRANSPORT_DEVICE_ACTIVATED:
755 *bl += sprintf(b + *bl, "ACTIVATED");
756 break;
757 case TRANSPORT_DEVICE_DEACTIVATED:
758 *bl += sprintf(b + *bl, "DEACTIVATED");
759 break;
760 case TRANSPORT_DEVICE_SHUTDOWN:
761 *bl += sprintf(b + *bl, "SHUTDOWN");
762 break;
763 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
764 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
765 *bl += sprintf(b + *bl, "OFFLINE");
766 break;
767 default:
768 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
769 break;
770 }
771
5f41a31d 772 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd
NB		 773 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
774 dev->se_sub_dev->se_dev_attrib.block_size,
775 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
c66ac9db
NB		 776 *bl += sprintf(b + *bl, " ");
777}
778
c66ac9db
NB		 779void transport_dump_vpd_proto_id(
780 struct t10_vpd *vpd,
781 unsigned char *p_buf,
782 int p_buf_len)
783{
784 unsigned char buf[VPD_TMP_BUF_SIZE];
785 int len;
786
787 memset(buf, 0, VPD_TMP_BUF_SIZE);
788 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
789
790 switch (vpd->protocol_identifier) {
791 case 0x00:
792 sprintf(buf+len, "Fibre Channel\n");
793 break;
794 case 0x10:
795 sprintf(buf+len, "Parallel SCSI\n");
796 break;
797 case 0x20:
798 sprintf(buf+len, "SSA\n");
799 break;
800 case 0x30:
801 sprintf(buf+len, "IEEE 1394\n");
802 break;
803 case 0x40:
804 sprintf(buf+len, "SCSI Remote Direct Memory Access"
805 " Protocol\n");
806 break;
807 case 0x50:
808 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
809 break;
810 case 0x60:
811 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
812 break;
813 case 0x70:
814 sprintf(buf+len, "Automation/Drive Interface Transport"
815 " Protocol\n");
816 break;
817 case 0x80:
818 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
819 break;
820 default:
821 sprintf(buf+len, "Unknown 0x%02x\n",
822 vpd->protocol_identifier);
823 break;
824 }
825
826 if (p_buf)
827 strncpy(p_buf, buf, p_buf_len);
828 else
6708bb27 829 pr_debug("%s", buf);
c66ac9db
NB		 830}
831
832void
833transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
834{
835 /*
836 * Check if the Protocol Identifier Valid (PIV) bit is set..
837 *
838 * from spc3r23.pdf section 7.5.1
839 */
840 if (page_83[1] & 0x80) {
841 vpd->protocol_identifier = (page_83[0] & 0xf0);
842 vpd->protocol_identifier_set = 1;
843 transport_dump_vpd_proto_id(vpd, NULL, 0);
844 }
845}
846EXPORT_SYMBOL(transport_set_vpd_proto_id);
847
848int transport_dump_vpd_assoc(
849 struct t10_vpd *vpd,
850 unsigned char *p_buf,
851 int p_buf_len)
852{
853 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 854 int ret = 0;
855 int len;
c66ac9db
NB		 856
857 memset(buf, 0, VPD_TMP_BUF_SIZE);
858 len = sprintf(buf, "T10 VPD Identifier Association: ");
859
860 switch (vpd->association) {
861 case 0x00:
862 sprintf(buf+len, "addressed logical unit\n");
863 break;
864 case 0x10:
865 sprintf(buf+len, "target port\n");
866 break;
867 case 0x20:
868 sprintf(buf+len, "SCSI target device\n");
869 break;
870 default:
871 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 872 ret = -EINVAL;
c66ac9db
NB		 873 break;
874 }
875
876 if (p_buf)
877 strncpy(p_buf, buf, p_buf_len);
878 else
6708bb27 879 pr_debug("%s", buf);
c66ac9db
NB		 880
881 return ret;
882}
883
884int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
885{
886 /*
887 * The VPD identification association..
888 *
889 * from spc3r23.pdf Section 7.6.3.1 Table 297
890 */
891 vpd->association = (page_83[1] & 0x30);
892 return transport_dump_vpd_assoc(vpd, NULL, 0);
893}
894EXPORT_SYMBOL(transport_set_vpd_assoc);
895
896int transport_dump_vpd_ident_type(
897 struct t10_vpd *vpd,
898 unsigned char *p_buf,
899 int p_buf_len)
900{
901 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 902 int ret = 0;
903 int len;
c66ac9db
NB		 904
905 memset(buf, 0, VPD_TMP_BUF_SIZE);
906 len = sprintf(buf, "T10 VPD Identifier Type: ");
907
908 switch (vpd->device_identifier_type) {
909 case 0x00:
910 sprintf(buf+len, "Vendor specific\n");
911 break;
912 case 0x01:
913 sprintf(buf+len, "T10 Vendor ID based\n");
914 break;
915 case 0x02:
916 sprintf(buf+len, "EUI-64 based\n");
917 break;
918 case 0x03:
919 sprintf(buf+len, "NAA\n");
920 break;
921 case 0x04:
922 sprintf(buf+len, "Relative target port identifier\n");
923 break;
924 case 0x08:
925 sprintf(buf+len, "SCSI name string\n");
926 break;
927 default:
928 sprintf(buf+len, "Unsupported: 0x%02x\n",
929 vpd->device_identifier_type);
e3d6f909 930 ret = -EINVAL;
c66ac9db
NB		 931 break;
932 }
933
e3d6f909
AG		 934 if (p_buf) {
935 if (p_buf_len < strlen(buf)+1)
936 return -EINVAL;
c66ac9db 937 strncpy(p_buf, buf, p_buf_len);
e3d6f909 938 } else {
6708bb27 939 pr_debug("%s", buf);
e3d6f909 940 }
c66ac9db
NB		 941
942 return ret;
943}
944
945int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
946{
947 /*
948 * The VPD identifier type..
949 *
950 * from spc3r23.pdf Section 7.6.3.1 Table 298
951 */
952 vpd->device_identifier_type = (page_83[1] & 0x0f);
953 return transport_dump_vpd_ident_type(vpd, NULL, 0);
954}
955EXPORT_SYMBOL(transport_set_vpd_ident_type);
956
957int transport_dump_vpd_ident(
958 struct t10_vpd *vpd,
959 unsigned char *p_buf,
960 int p_buf_len)
961{
962 unsigned char buf[VPD_TMP_BUF_SIZE];
963 int ret = 0;
964
965 memset(buf, 0, VPD_TMP_BUF_SIZE);
966
967 switch (vpd->device_identifier_code_set) {
968 case 0x01: /* Binary */
969 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
970 &vpd->device_identifier[0]);
971 break;
972 case 0x02: /* ASCII */
973 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
974 &vpd->device_identifier[0]);
975 break;
976 case 0x03: /* UTF-8 */
977 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
978 &vpd->device_identifier[0]);
979 break;
980 default:
981 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
982 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 983 ret = -EINVAL;
c66ac9db
NB		 984 break;
985 }
986
987 if (p_buf)
988 strncpy(p_buf, buf, p_buf_len);
989 else
6708bb27 990 pr_debug("%s", buf);
c66ac9db
NB		 991
992 return ret;
993}
994
995int
996transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
997{
998 static const char hex_str[] = "0123456789abcdef";
999 int j = 0, i = 4; /* offset to start of the identifer */
1000
1001 /*
1002 * The VPD Code Set (encoding)
1003 *
1004 * from spc3r23.pdf Section 7.6.3.1 Table 296
1005 */
1006 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1007 switch (vpd->device_identifier_code_set) {
1008 case 0x01: /* Binary */
1009 vpd->device_identifier[j++] =
1010 hex_str[vpd->device_identifier_type];
1011 while (i < (4 + page_83[3])) {
1012 vpd->device_identifier[j++] =
1013 hex_str[(page_83[i] & 0xf0) >> 4];
1014 vpd->device_identifier[j++] =
1015 hex_str[page_83[i] & 0x0f];
1016 i++;
1017 }
1018 break;
1019 case 0x02: /* ASCII */
1020 case 0x03: /* UTF-8 */
1021 while (i < (4 + page_83[3]))
1022 vpd->device_identifier[j++] = page_83[i++];
1023 break;
1024 default:
1025 break;
1026 }
1027
1028 return transport_dump_vpd_ident(vpd, NULL, 0);
1029}
1030EXPORT_SYMBOL(transport_set_vpd_ident);
1031
1032static void core_setup_task_attr_emulation(struct se_device *dev)
1033{
1034 /*
1035 * If this device is from Target_Core_Mod/pSCSI, disable the
1036 * SAM Task Attribute emulation.
1037 *
1038 * This is currently not available in upsream Linux/SCSI Target
1039 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1040 */
e3d6f909 1041 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1042 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1043 return;
1044 }
1045
1046 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1047 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1048 " device\n", dev->transport->name,
1049 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1050}
1051
1052static void scsi_dump_inquiry(struct se_device *dev)
1053{
e3d6f909 1054 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1055 char buf[17];
c66ac9db
NB		 1056 int i, device_type;
1057 /*
1058 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1059 */
c66ac9db
NB		 1060 for (i = 0; i < 8; i++)
1061 if (wwn->vendor[i] >= 0x20)
e59a41b6 1062 buf[i] = wwn->vendor[i];
c66ac9db 1063 else
e59a41b6
SAS		 1064 buf[i] = ' ';
1065 buf[i] = '\0';
1066 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1067
c66ac9db
NB		 1068 for (i = 0; i < 16; i++)
1069 if (wwn->model[i] >= 0x20)
e59a41b6 1070 buf[i] = wwn->model[i];
c66ac9db 1071 else
e59a41b6
SAS		 1072 buf[i] = ' ';
1073 buf[i] = '\0';
1074 pr_debug(" Model: %s\n", buf);
c66ac9db 1075
c66ac9db
NB		 1076 for (i = 0; i < 4; i++)
1077 if (wwn->revision[i] >= 0x20)
e59a41b6 1078 buf[i] = wwn->revision[i];
c66ac9db 1079 else
e59a41b6
SAS		 1080 buf[i] = ' ';
1081 buf[i] = '\0';
1082 pr_debug(" Revision: %s\n", buf);
c66ac9db 1083
e3d6f909 1084 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1085 pr_debug(" Type: %s ", scsi_device_type(device_type));
1086 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1087 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1088}
1089
1090struct se_device *transport_add_device_to_core_hba(
1091 struct se_hba *hba,
1092 struct se_subsystem_api *transport,
1093 struct se_subsystem_dev *se_dev,
1094 u32 device_flags,
1095 void *transport_dev,
1096 struct se_dev_limits *dev_limits,
1097 const char *inquiry_prod,
1098 const char *inquiry_rev)
1099{
12a18bdc 1100 int force_pt;
c66ac9db
NB		 1101 struct se_device *dev;
1102
1103 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1104 if (!dev) {
1105 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1106 return NULL;
1107 }
c66ac9db
NB		 1108
1109 dev->dev_flags = device_flags;
1110 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1111 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1112 dev->se_hba = hba;
1113 dev->se_sub_dev = se_dev;
1114 dev->transport = transport;
c66ac9db
NB		 1115 INIT_LIST_HEAD(&dev->dev_list);
1116 INIT_LIST_HEAD(&dev->dev_sep_list);
1117 INIT_LIST_HEAD(&dev->dev_tmr_list);
c66ac9db 1118 INIT_LIST_HEAD(&dev->delayed_cmd_list);
cf572a96 1119 INIT_LIST_HEAD(&dev->state_list);
07bde79a 1120 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1121 spin_lock_init(&dev->execute_task_lock);
1122 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1123 spin_lock_init(&dev->dev_reservation_lock);
1124 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1125 spin_lock_init(&dev->se_port_lock);
1126 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1127 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1128 atomic_set(&dev->dev_ordered_id, 0);
1129
1130 se_dev_set_default_attribs(dev, dev_limits);
1131
1132 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1133 dev->creation_time = get_jiffies_64();
1134 spin_lock_init(&dev->stats_lock);
1135
1136 spin_lock(&hba->device_lock);
1137 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1138 hba->dev_count++;
1139 spin_unlock(&hba->device_lock);
1140 /*
1141 * Setup the SAM Task Attribute emulation for struct se_device
1142 */
1143 core_setup_task_attr_emulation(dev);
1144 /*
1145 * Force PR and ALUA passthrough emulation with internal object use.
1146 */
1147 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1148 /*
1149 * Setup the Reservations infrastructure for struct se_device
1150 */
1151 core_setup_reservations(dev, force_pt);
1152 /*
1153 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1154 */
1155 if (core_setup_alua(dev, force_pt) < 0)
2962846d 1156 goto err_dev_list;
c66ac9db
NB		 1157
1158 /*
1159 * Startup the struct se_device processing thread
1160 */
af877292
CH		 1161 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1162 dev->transport->name);
1163 if (!dev->tmr_wq) {
1164 pr_err("Unable to create tmr workqueue for %s\n",
e3d6f909 1165 dev->transport->name);
2962846d 1166 goto err_dev_list;
c66ac9db 1167 }
07bde79a
NB		 1168 /*
1169 * Setup work_queue for QUEUE_FULL
1170 */
1171 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1172 /*
1173 * Preload the initial INQUIRY const values if we are doing
1174 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1175 * passthrough because this is being provided by the backend LLD.
1176 * This is required so that transport_get_inquiry() copies these
1177 * originals once back into DEV_T10_WWN(dev) for the virtual device
1178 * setup.
1179 */
e3d6f909 1180 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1181 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1182 pr_err("All non TCM/pSCSI plugins require"
c66ac9db 1183 " INQUIRY consts\n");
2962846d 1184 goto err_wq;
c66ac9db
NB		 1185 }
1186
e3d6f909
AG		 1187 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1188 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1189 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1190 }
1191 scsi_dump_inquiry(dev);
1192
12a18bdc 1193 return dev;
c66ac9db 1194
2962846d
DC		 1195err_wq:
1196 destroy_workqueue(dev->tmr_wq);
1197err_dev_list:
c66ac9db
NB		 1198 spin_lock(&hba->device_lock);
1199 list_del(&dev->dev_list);
1200 hba->dev_count--;
1201 spin_unlock(&hba->device_lock);
1202
1203 se_release_vpd_for_dev(dev);
1204
c66ac9db
NB		 1205 kfree(dev);
1206
1207 return NULL;
1208}
1209EXPORT_SYMBOL(transport_add_device_to_core_hba);
1210
1fd032ee 1211int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1212{
1213 struct se_device *dev = cmd->se_dev;
1214
1215 if (cmd->unknown_data_length) {
1216 cmd->data_length = size;
1217 } else if (size != cmd->data_length) {
1218 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1219 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1220 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1221 cmd->data_length, size, cmd->t_task_cdb[0]);
1222
9b3b8041
CH		 1223 if (cmd->data_direction == DMA_TO_DEVICE) {
1224 pr_err("Rejecting underflow/overflow"
1225 " WRITE data\n");
1226 goto out_invalid_cdb_field;
1227 }
1228 /*
1229 * Reject READ_* or WRITE_* with overflow/underflow for
1230 * type SCF_SCSI_DATA_CDB.
1231 */
1232 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1233 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1234 " CDB on non 512-byte sector setup subsystem"
1235 " plugin: %s\n", dev->transport->name);
1236 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1237 goto out_invalid_cdb_field;
1238 }
4c054ba6
NB		 1239 /*
1240 * For the overflow case keep the existing fabric provided
1241 * ->data_length. Otherwise for the underflow case, reset
1242 * ->data_length to the smaller SCSI expected data transfer
1243 * length.
1244 */
9b3b8041
CH		 1245 if (size > cmd->data_length) {
1246 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1247 cmd->residual_count = (size - cmd->data_length);
1248 } else {
1249 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1250 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1251 cmd->data_length = size;
9b3b8041 1252 }
9b3b8041
CH		 1253 }
1254
1255 return 0;
1256
1257out_invalid_cdb_field:
1258 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1259 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1260 return -EINVAL;
1261}
1262
c66ac9db
NB		 1263/*
1264 * Used by fabric modules containing a local struct se_cmd within their
1265 * fabric dependent per I/O descriptor.
1266 */
1267void transport_init_se_cmd(
1268 struct se_cmd *cmd,
1269 struct target_core_fabric_ops *tfo,
1270 struct se_session *se_sess,
1271 u32 data_length,
1272 int data_direction,
1273 int task_attr,
1274 unsigned char *sense_buffer)
1275{
5951146d
AG		 1276 INIT_LIST_HEAD(&cmd->se_lun_node);
1277 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1278 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1279 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1280 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1281 init_completion(&cmd->transport_lun_fe_stop_comp);
1282 init_completion(&cmd->transport_lun_stop_comp);
1283 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1284 init_completion(&cmd->cmd_wait_comp);
cf572a96 1285 init_completion(&cmd->task_stop_comp);
a1d8b49a 1286 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1287 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1288
1289 cmd->se_tfo = tfo;
1290 cmd->se_sess = se_sess;
1291 cmd->data_length = data_length;
1292 cmd->data_direction = data_direction;
1293 cmd->sam_task_attr = task_attr;
1294 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1295
1296 cmd->state_active = false;
c66ac9db
NB		 1297}
1298EXPORT_SYMBOL(transport_init_se_cmd);
1299
1300static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1301{
1302 /*
1303 * Check if SAM Task Attribute emulation is enabled for this
1304 * struct se_device storage object
1305 */
5951146d 1306 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1307 return 0;
1308
e66ecd50 1309 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1310 pr_debug("SAM Task Attribute ACA"
c66ac9db 1311 " emulation is not supported\n");
e3d6f909 1312 return -EINVAL;
c66ac9db
NB		 1313 }
1314 /*
1315 * Used to determine when ORDERED commands should go from
1316 * Dormant to Active status.
1317 */
5951146d 1318 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1319 smp_mb__after_atomic_inc();
6708bb27 1320 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1321 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1322 cmd->se_dev->transport->name);
c66ac9db
NB		 1323 return 0;
1324}
1325
a12f41f8 1326/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1327 *
1328 * Called from fabric RX Thread.
1329 */
a12f41f8 1330int target_setup_cmd_from_cdb(
c66ac9db
NB		 1331 struct se_cmd *cmd,
1332 unsigned char *cdb)
1333{
cb4f4d3c
CH		 1334 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1335 u32 pr_reg_type = 0;
1336 u8 alua_ascq = 0;
1337 unsigned long flags;
c66ac9db
NB		 1338 int ret;
1339
c66ac9db
NB		 1340 /*
1341 * Ensure that the received CDB is less than the max (252 + 8) bytes
1342 * for VARIABLE_LENGTH_CMD
1343 */
1344 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1345 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1346 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1347 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1348 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1349 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1350 return -EINVAL;
c66ac9db
NB		 1351 }
1352 /*
1353 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1354 * allocate the additional extended CDB buffer now.. Otherwise
1355 * setup the pointer from __t_task_cdb to t_task_cdb.
1356 */
a1d8b49a
AG		 1357 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1358 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1359 GFP_KERNEL);
6708bb27
AG		 1360 if (!cmd->t_task_cdb) {
1361 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1362 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1363 scsi_command_size(cdb),
a1d8b49a 1364 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1365 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1366 cmd->scsi_sense_reason =
1367 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1368 return -ENOMEM;
c66ac9db
NB		 1369 }
1370 } else
a1d8b49a 1371 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1372 /*
a1d8b49a 1373 * Copy the original CDB into cmd->
c66ac9db 1374 */
a1d8b49a 1375 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1376
1377 /*
1378 * Check for an existing UNIT ATTENTION condition
1379 */
1380 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1381 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1382 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1383 return -EINVAL;
1384 }
1385
1386 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1387 if (ret != 0) {
1388 /*
1389 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1390 * The ALUA additional sense code qualifier (ASCQ) is determined
1391 * by the ALUA primary or secondary access state..
1392 */
1393 if (ret > 0) {
1394 pr_debug("[%s]: ALUA TG Port not available, "
1395 "SenseKey: NOT_READY, ASC/ASCQ: "
1396 "0x04/0x%02x\n",
1397 cmd->se_tfo->get_fabric_name(), alua_ascq);
1398
1399 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1400 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1401 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1402 return -EINVAL;
1403 }
1404 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1405 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1406 return -EINVAL;
1407 }
1408
1409 /*
1410 * Check status for SPC-3 Persistent Reservations
1411 */
1412 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1413 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1414 cmd, cdb, pr_reg_type) != 0) {
1415 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1416 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1417 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1418 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1419 return -EBUSY;
1420 }
1421 /*
1422 * This means the CDB is allowed for the SCSI Initiator port
1423 * when said port is *NOT* holding the legacy SPC-2 or
1424 * SPC-3 Persistent Reservation.
1425 */
1426 }
1427
1fd032ee 1428 ret = cmd->se_dev->transport->parse_cdb(cmd);
c66ac9db
NB		 1429 if (ret < 0)
1430 return ret;
cb4f4d3c
CH		 1431
1432 spin_lock_irqsave(&cmd->t_state_lock, flags);
1433 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1434 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1435
c66ac9db
NB		 1436 /*
1437 * Check for SAM Task Attribute Emulation
1438 */
1439 if (transport_check_alloc_task_attr(cmd) < 0) {
1440 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1441 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1442 return -EINVAL;
c66ac9db
NB		 1443 }
1444 spin_lock(&cmd->se_lun->lun_sep_lock);
1445 if (cmd->se_lun->lun_sep)
1446 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1447 spin_unlock(&cmd->se_lun->lun_sep_lock);
1448 return 0;
1449}
a12f41f8 1450EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1451
695434e1
NB		 1452/*
1453 * Used by fabric module frontends to queue tasks directly.
1454 * Many only be used from process context only
1455 */
1456int transport_handle_cdb_direct(
1457 struct se_cmd *cmd)
1458{
dd8ae59d
NB		 1459 int ret;
1460
695434e1
NB		 1461 if (!cmd->se_lun) {
1462 dump_stack();
6708bb27 1463 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1464 return -EINVAL;
1465 }
1466 if (in_interrupt()) {
1467 dump_stack();
6708bb27 1468 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1469 " from interrupt context\n");
1470 return -EINVAL;
1471 }
dd8ae59d 1472 /*
af877292
CH		 1473 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1474 * outstanding descriptors are handled correctly during shutdown via
1475 * transport_wait_for_tasks()
dd8ae59d
NB		 1476 *
1477 * Also, we don't take cmd->t_state_lock here as we only expect
1478 * this to be called for initial descriptor submission.
1479 */
1480 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1481 cmd->transport_state |= CMD_T_ACTIVE;
1482
dd8ae59d
NB		 1483 /*
1484 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1485 * so follow TRANSPORT_NEW_CMD processing thread context usage
1486 * and call transport_generic_request_failure() if necessary..
1487 */
1488 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1489 if (ret < 0)
1490 transport_generic_request_failure(cmd);
1491
dd8ae59d 1492 return 0;
695434e1
NB		 1493}
1494EXPORT_SYMBOL(transport_handle_cdb_direct);
1495
a6360785
NB		 1496/**
1497 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1498 *
1499 * @se_cmd: command descriptor to submit
1500 * @se_sess: associated se_sess for endpoint
1501 * @cdb: pointer to SCSI CDB
1502 * @sense: pointer to SCSI sense buffer
1503 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1504 * @data_length: fabric expected data transfer length
1505 * @task_addr: SAM task attribute
1506 * @data_dir: DMA data direction
1507 * @flags: flags for command submission from target_sc_flags_tables
1508 *
d6dfc868
RD		 1509 * Returns non zero to signal active I/O shutdown failure. All other
1510 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1511 * but still return zero here.
1512 *
a6360785
NB		 1513 * This may only be called from process context, and also currently
1514 * assumes internal allocation of fabric payload buffer by target-core.
1515 **/
d6dfc868 1516int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1517 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1518 u32 data_length, int task_attr, int data_dir, int flags)
1519{
1520 struct se_portal_group *se_tpg;
1521 int rc;
1522
1523 se_tpg = se_sess->se_tpg;
1524 BUG_ON(!se_tpg);
1525 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1526 BUG_ON(in_interrupt());
1527 /*
1528 * Initialize se_cmd for target operation. From this point
1529 * exceptions are handled by sending exception status via
1530 * target_core_fabric_ops->queue_status() callback
1531 */
1532 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1533 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1534 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1535 se_cmd->unknown_data_length = 1;
a6360785
NB		 1536 /*
1537 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1538 * se_sess->sess_cmd_list. A second kref_get here is necessary
1539 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1540 * kref_put() to happen during fabric packet acknowledgement.
1541 */
bc187ea6
RD		 1542 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1543 if (rc)
d6dfc868 1544 return rc;
a6360785
NB		 1545 /*
1546 * Signal bidirectional data payloads to target-core
1547 */
1548 if (flags & TARGET_SCF_BIDI_OP)
1549 se_cmd->se_cmd_flags |= SCF_BIDI;
1550 /*
1551 * Locate se_lun pointer and attach it to struct se_cmd
1552 */
735703ca
NB		 1553 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1554 transport_send_check_condition_and_sense(se_cmd,
1555 se_cmd->scsi_sense_reason, 0);
1556 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1557 return 0;
735703ca 1558 }
d6e0175c 1559
a12f41f8 1560 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1561 if (rc != 0) {
1562 transport_generic_request_failure(se_cmd);
d6dfc868 1563 return 0;
735703ca 1564 }
11e319ed
AG		 1565
1566 /*
1567 * Check if we need to delay processing because of ALUA
1568 * Active/NonOptimized primary access state..
1569 */
1570 core_alua_check_nonop_delay(se_cmd);
1571
a6360785 1572 transport_handle_cdb_direct(se_cmd);
d6dfc868 1573 return 0;
a6360785
NB		 1574}
1575EXPORT_SYMBOL(target_submit_cmd);
1576
9f0d05c2
NB		 1577static void target_complete_tmr_failure(struct work_struct *work)
1578{
1579 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1580
1581 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1582 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1583 transport_generic_free_cmd(se_cmd, 0);
1584}
1585
ea98d7f9
AG		 1586/**
1587 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1588 * for TMR CDBs
1589 *
1590 * @se_cmd: command descriptor to submit
1591 * @se_sess: associated se_sess for endpoint
1592 * @sense: pointer to SCSI sense buffer
1593 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1594 * @fabric_context: fabric context for TMR req
1595 * @tm_type: Type of TM request
c0974f89
NB		 1596 * @gfp: gfp type for caller
1597 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1598 * @flags: submit cmd flags
ea98d7f9
AG		 1599 *
1600 * Callable from all contexts.
1601 **/
1602
c7042cae 1603int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1604 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1605 void *fabric_tmr_ptr, unsigned char tm_type,
1606 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1607{
1608 struct se_portal_group *se_tpg;
1609 int ret;
1610
1611 se_tpg = se_sess->se_tpg;
1612 BUG_ON(!se_tpg);
1613
1614 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1615 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1616 /*
1617 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1618 * allocation failure.
1619 */
c0974f89 1620 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1621 if (ret < 0)
1622 return -ENOMEM;
ea98d7f9 1623
c0974f89
NB		 1624 if (tm_type == TMR_ABORT_TASK)
1625 se_cmd->se_tmr_req->ref_task_tag = tag;
1626
ea98d7f9 1627 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1628 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1629 if (ret) {
1630 core_tmr_release_req(se_cmd->se_tmr_req);
1631 return ret;
1632 }
ea98d7f9 1633
ea98d7f9
AG		 1634 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1635 if (ret) {
9f0d05c2
NB		 1636 /*
1637 * For callback during failure handling, push this work off
1638 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1639 */
1640 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1641 schedule_work(&se_cmd->work);
c7042cae 1642 return 0;
ea98d7f9
AG		 1643 }
1644 transport_generic_handle_tmr(se_cmd);
c7042cae 1645 return 0;
ea98d7f9
AG		 1646}
1647EXPORT_SYMBOL(target_submit_tmr);
1648
cdbb70bb 1649/*
cf572a96 1650 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1651 * has completed.
1652 */
cf572a96 1653bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1654{
cdbb70bb
CH		 1655 bool was_active = false;
1656
cf572a96
CH		 1657 if (cmd->transport_state & CMD_T_BUSY) {
1658 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1659 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1660
cf572a96
CH		 1661 pr_debug("cmd %p waiting to complete\n", cmd);
1662 wait_for_completion(&cmd->task_stop_comp);
1663 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1664
1665 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1666 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1667 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1668 was_active = true;
1669 }
1670
cdbb70bb
CH		 1671 return was_active;
1672}
1673
c66ac9db
NB		 1674/*
1675 * Handle SAM-esque emulation for generic transport request failures.
1676 */
2fbff127 1677void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1678{
07bde79a
NB		 1679 int ret = 0;
1680
6708bb27 1681 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1682 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1683 cmd->t_task_cdb[0]);
03e98c9e 1684 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1685 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1686 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1687 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1688 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1689 (cmd->transport_state & CMD_T_STOP) != 0,
1690 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1691
c66ac9db
NB		 1692 /*
1693 * For SAM Task Attribute emulation for failed struct se_cmd
1694 */
1695 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1696 transport_complete_task_attr(cmd);
1697
03e98c9e
NB		 1698 switch (cmd->scsi_sense_reason) {
1699 case TCM_NON_EXISTENT_LUN:
1700 case TCM_UNSUPPORTED_SCSI_OPCODE:
1701 case TCM_INVALID_CDB_FIELD:
1702 case TCM_INVALID_PARAMETER_LIST:
1703 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1704 case TCM_UNKNOWN_MODE_PAGE:
1705 case TCM_WRITE_PROTECTED:
e2397c70 1706 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1707 case TCM_CHECK_CONDITION_ABORT_CMD:
1708 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1709 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1710 break;
03e98c9e 1711 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1712 /*
1713 * No SENSE Data payload for this case, set SCSI Status
1714 * and queue the response to $FABRIC_MOD.
1715 *
1716 * Uses linux/include/scsi/scsi.h SAM status codes defs
1717 */
1718 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1719 /*
1720 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1721 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1722 * CONFLICT STATUS.
1723 *
1724 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1725 */
e3d6f909
AG		 1726 if (cmd->se_sess &&
1727 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1728 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1729 cmd->orig_fe_lun, 0x2C,
1730 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1731
07bde79a 1732 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1733 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1734 goto queue_full;
c66ac9db 1735 goto check_stop;
c66ac9db 1736 default:
6708bb27 1737 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1738 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1739 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1740 break;
1741 }
f3146437 1742
03e98c9e
NB		 1743 ret = transport_send_check_condition_and_sense(cmd,
1744 cmd->scsi_sense_reason, 0);
1745 if (ret == -EAGAIN || ret == -ENOMEM)
1746 goto queue_full;
07bde79a 1747
c66ac9db
NB		 1748check_stop:
1749 transport_lun_remove_cmd(cmd);
6708bb27 1750 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1751 ;
07bde79a
NB		 1752 return;
1753
1754queue_full:
e057f533
CH		 1755 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1756 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1757}
2fbff127 1758EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1759
5f41a31d 1760static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1761{
0c2ad7d1 1762 int error = 0;
5f41a31d
CH		 1763
1764 spin_lock_irq(&cmd->t_state_lock);
1765 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1766 spin_unlock_irq(&cmd->t_state_lock);
1767
1768 if (cmd->execute_cmd)
1769 error = cmd->execute_cmd(cmd);
5f41a31d
CH		 1770
1771 if (error) {
1772 spin_lock_irq(&cmd->t_state_lock);
1773 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1774 spin_unlock_irq(&cmd->t_state_lock);
1775
1776 transport_generic_request_failure(cmd);
1777 }
1778}
1779
70baf0ab 1780void target_execute_cmd(struct se_cmd *cmd)
5f41a31d
CH		 1781{
1782 struct se_device *dev = cmd->se_dev;
1783
d59a02b4
CH		 1784 /*
1785 * If the received CDB has aleady been aborted stop processing it here.
1786 */
1787 if (transport_check_aborted_status(cmd, 1))
1788 return;
1789
f7113a47
CH		 1790 /*
1791 * Determine if IOCTL context caller in requesting the stopping of this
1792 * command for LUN shutdown purposes.
1793 */
1794 spin_lock_irq(&cmd->t_state_lock);
1795 if (cmd->transport_state & CMD_T_LUN_STOP) {
1796 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1797 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1798
1799 cmd->transport_state &= ~CMD_T_ACTIVE;
1800 spin_unlock_irq(&cmd->t_state_lock);
1801 complete(&cmd->transport_lun_stop_comp);
1802 return;
1803 }
1804 /*
1805 * Determine if frontend context caller is requesting the stopping of
1806 * this command for frontend exceptions.
1807 */
1808 if (cmd->transport_state & CMD_T_STOP) {
1809 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1810 __func__, __LINE__,
1811 cmd->se_tfo->get_task_tag(cmd));
1812
1813 spin_unlock_irq(&cmd->t_state_lock);
1814 complete(&cmd->t_transport_stop_comp);
5f41a31d 1815 return;
f7113a47
CH		 1816 }
1817
1818 cmd->t_state = TRANSPORT_PROCESSING;
1819 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d
CH		 1820
1821 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1822 goto execute;
1823
c66ac9db 1824 /*
25985edc 1825 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1826 * to allow the passed struct se_cmd list of tasks to the front of the list.
1827 */
5f41a31d
CH		 1828 switch (cmd->sam_task_attr) {
1829 case MSG_HEAD_TAG:
1830 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1831 "se_ordered_id: %u\n",
1832 cmd->t_task_cdb[0], cmd->se_ordered_id);
1833 goto execute;
1834 case MSG_ORDERED_TAG:
1835 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1836 smp_mb__after_atomic_inc();
1837
5f41a31d
CH		 1838 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1839 " se_ordered_id: %u\n",
1840 cmd->t_task_cdb[0], cmd->se_ordered_id);
1841
c66ac9db 1842 /*
5f41a31d
CH		 1843 * Execute an ORDERED command if no other older commands
1844 * exist that need to be completed first.
c66ac9db 1845 */
5f41a31d
CH		 1846 if (!atomic_read(&dev->simple_cmds))
1847 goto execute;
1848 break;
1849 default:
c66ac9db
NB		 1850 /*
1851 * For SIMPLE and UNTAGGED Task Attribute commands
1852 */
5f41a31d 1853 atomic_inc(&dev->simple_cmds);
c66ac9db 1854 smp_mb__after_atomic_inc();
5f41a31d 1855 break;
c66ac9db 1856 }
5f41a31d
CH		 1857
1858 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1859 spin_lock(&dev->delayed_cmd_lock);
5f41a31d
CH		 1860 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1861 spin_unlock(&dev->delayed_cmd_lock);
c66ac9db 1862
6708bb27 1863 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1864 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1865 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db 1866 cmd->se_ordered_id);
5f41a31d 1867 return;
c66ac9db 1868 }
c66ac9db 1869
5f41a31d 1870execute:
c66ac9db 1871 /*
5f41a31d 1872 * Otherwise, no ORDERED task attributes exist..
c66ac9db 1873 */
5f41a31d 1874 __target_execute_cmd(cmd);
c66ac9db 1875}
70baf0ab 1876EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1877
5f41a31d
CH		 1878/*
1879 * Process all commands up to the last received ORDERED task attribute which
1880 * requires another blocking boundary
1881 */
1882static void target_restart_delayed_cmds(struct se_device *dev)
1883{
1884 for (;;) {
1885 struct se_cmd *cmd;
1886
1887 spin_lock(&dev->delayed_cmd_lock);
1888 if (list_empty(&dev->delayed_cmd_list)) {
1889 spin_unlock(&dev->delayed_cmd_lock);
1890 break;
1891 }
1892
1893 cmd = list_entry(dev->delayed_cmd_list.next,
1894 struct se_cmd, se_delayed_node);
1895 list_del(&cmd->se_delayed_node);
1896 spin_unlock(&dev->delayed_cmd_lock);
1897
1898 __target_execute_cmd(cmd);
1899
1900 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1901 break;
1902 }
1903}
1904
c66ac9db 1905/*
35e0e757 1906 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1907 * and ordered cmds need to have their tasks added to the execution queue.
1908 */
1909static void transport_complete_task_attr(struct se_cmd *cmd)
1910{
5951146d 1911 struct se_device *dev = cmd->se_dev;
c66ac9db 1912
e66ecd50 1913 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1914 atomic_dec(&dev->simple_cmds);
1915 smp_mb__after_atomic_dec();
1916 dev->dev_cur_ordered_id++;
6708bb27 1917 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1918 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1919 cmd->se_ordered_id);
e66ecd50 1920 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1921 dev->dev_cur_ordered_id++;
6708bb27 1922 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1923 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1924 cmd->se_ordered_id);
e66ecd50 1925 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1926 atomic_dec(&dev->dev_ordered_sync);
1927 smp_mb__after_atomic_dec();
c66ac9db
NB		 1928
1929 dev->dev_cur_ordered_id++;
6708bb27 1930 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1931 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1932 }
c66ac9db 1933
5f41a31d 1934 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1935}
1936
e057f533 1937static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1938{
1939 int ret = 0;
1940
e057f533
CH		 1941 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1942 transport_complete_task_attr(cmd);
1943
1944 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1945 ret = cmd->se_tfo->queue_status(cmd);
1946 if (ret)
1947 goto out;
1948 }
07bde79a
NB		 1949
1950 switch (cmd->data_direction) {
1951 case DMA_FROM_DEVICE:
1952 ret = cmd->se_tfo->queue_data_in(cmd);
1953 break;
1954 case DMA_TO_DEVICE:
ec98f782 1955 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1956 ret = cmd->se_tfo->queue_data_in(cmd);
1957 if (ret < 0)
e057f533 1958 break;
07bde79a
NB		 1959 }
1960 /* Fall through for DMA_TO_DEVICE */
1961 case DMA_NONE:
1962 ret = cmd->se_tfo->queue_status(cmd);
1963 break;
1964 default:
1965 break;
1966 }
1967
e057f533
CH		 1968out:
1969 if (ret < 0) {
1970 transport_handle_queue_full(cmd, cmd->se_dev);
1971 return;
1972 }
1973 transport_lun_remove_cmd(cmd);
1974 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1975}
1976
1977static void transport_handle_queue_full(
1978 struct se_cmd *cmd,
e057f533 1979 struct se_device *dev)
07bde79a
NB		 1980{
1981 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1982 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1983 atomic_inc(&dev->dev_qf_count);
1984 smp_mb__after_atomic_inc();
1985 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1986
1987 schedule_work(&cmd->se_dev->qf_work_queue);
1988}
1989
35e0e757 1990static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1991{
35e0e757 1992 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 1993 int reason = 0, ret;
35e0e757 1994
c66ac9db
NB		 1995 /*
1996 * Check if we need to move delayed/dormant tasks from cmds on the
1997 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1998 * Attribute.
1999 */
5951146d 2000 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 2001 transport_complete_task_attr(cmd);
07bde79a
NB		 2002 /*
2003 * Check to schedule QUEUE_FULL work, or execute an existing
2004 * cmd->transport_qf_callback()
2005 */
2006 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2007 schedule_work(&cmd->se_dev->qf_work_queue);
2008
c66ac9db
NB		 2009 /*
2010 * Check if we need to retrieve a sense buffer from
2011 * the struct se_cmd in question.
2012 */
2013 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2014 if (transport_get_sense_data(cmd) < 0)
2015 reason = TCM_NON_EXISTENT_LUN;
2016
c66ac9db 2017 if (cmd->scsi_status) {
07bde79a 2018 ret = transport_send_check_condition_and_sense(
c66ac9db 2019 cmd, reason, 1);
f147abb4 2020 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 2021 goto queue_full;
2022
c66ac9db
NB		 2023 transport_lun_remove_cmd(cmd);
2024 transport_cmd_check_stop_to_fabric(cmd);
2025 return;
2026 }
2027 }
2028 /*
25985edc 2029 * Check for a callback, used by amongst other things
c66ac9db
NB		 2030 * XDWRITE_READ_10 emulation.
2031 */
2032 if (cmd->transport_complete_callback)
2033 cmd->transport_complete_callback(cmd);
2034
2035 switch (cmd->data_direction) {
2036 case DMA_FROM_DEVICE:
2037 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2038 if (cmd->se_lun->lun_sep) {
2039 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2040 cmd->data_length;
2041 }
2042 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 2043
07bde79a 2044 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2045 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2046 goto queue_full;
c66ac9db
NB		 2047 break;
2048 case DMA_TO_DEVICE:
2049 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2050 if (cmd->se_lun->lun_sep) {
2051 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2052 cmd->data_length;
2053 }
2054 spin_unlock(&cmd->se_lun->lun_sep_lock);
2055 /*
2056 * Check if we need to send READ payload for BIDI-COMMAND
2057 */
ec98f782 2058 if (cmd->t_bidi_data_sg) {
c66ac9db 2059 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2060 if (cmd->se_lun->lun_sep) {
2061 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2062 cmd->data_length;
2063 }
2064 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2065 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2066 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2067 goto queue_full;
c66ac9db
NB		 2068 break;
2069 }
2070 /* Fall through for DMA_TO_DEVICE */
2071 case DMA_NONE:
07bde79a 2072 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2073 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2074 goto queue_full;
c66ac9db
NB		 2075 break;
2076 default:
2077 break;
2078 }
2079
2080 transport_lun_remove_cmd(cmd);
2081 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2082 return;
2083
2084queue_full:
6708bb27 2085 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2086 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2087 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2088 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2089}
2090
6708bb27 2091static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2092{
ec98f782 2093 struct scatterlist *sg;
ec98f782 2094 int count;
c66ac9db 2095
6708bb27
AG		 2096 for_each_sg(sgl, sg, nents, count)
2097 __free_page(sg_page(sg));
c66ac9db 2098
6708bb27
AG		 2099 kfree(sgl);
2100}
c66ac9db 2101
6708bb27
AG		 2102static inline void transport_free_pages(struct se_cmd *cmd)
2103{
2104 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2105 return;
2106
2107 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2108 cmd->t_data_sg = NULL;
2109 cmd->t_data_nents = 0;
c66ac9db 2110
6708bb27 2111 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2112 cmd->t_bidi_data_sg = NULL;
2113 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2114}
2115
e26d99ae
CH		 2116/**
2117 * transport_release_cmd - free a command
2118 * @cmd: command to free
2119 *
2120 * This routine unconditionally frees a command, and reference counting
2121 * or list removal must be done in the caller.
2122 */
2123static void transport_release_cmd(struct se_cmd *cmd)
2124{
2125 BUG_ON(!cmd->se_tfo);
2126
c8e31f26 2127 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2128 core_tmr_release_req(cmd->se_tmr_req);
2129 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2130 kfree(cmd->t_task_cdb);
2131 /*
7481deb4
NB		 2132 * If this cmd has been setup with target_get_sess_cmd(), drop
2133 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2134 */
7481deb4
NB		 2135 if (cmd->check_release != 0) {
2136 target_put_sess_cmd(cmd->se_sess, cmd);
2137 return;
2138 }
e26d99ae
CH		 2139 cmd->se_tfo->release_cmd(cmd);
2140}
2141
d3df7825
CH		 2142/**
2143 * transport_put_cmd - release a reference to a command
2144 * @cmd: command to release
2145 *
2146 * This routine releases our reference to the command and frees it if possible.
2147 */
39c05f32 2148static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 2149{
2150 unsigned long flags;
c66ac9db 2151
a1d8b49a 2152 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 2153 if (atomic_read(&cmd->t_fe_count)) {
2154 if (!atomic_dec_and_test(&cmd->t_fe_count))
2155 goto out_busy;
2156 }
2157
7d680f3b
CH		 2158 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2159 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2160 target_remove_from_state_list(cmd);
c66ac9db 2161 }
a1d8b49a 2162 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2163
c66ac9db 2164 transport_free_pages(cmd);
31afc39c 2165 transport_release_cmd(cmd);
39c05f32 2166 return;
4911e3cc
CH		 2167out_busy:
2168 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2169}
2170
c66ac9db 2171/*
ec98f782
AG		 2172 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2173 * allocating in the core.
c66ac9db
NB		 2174 * @cmd: Associated se_cmd descriptor
2175 * @mem: SGL style memory for TCM WRITE / READ
2176 * @sg_mem_num: Number of SGL elements
2177 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2178 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2179 *
2180 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2181 * of parameters.
2182 */
2183int transport_generic_map_mem_to_cmd(
2184 struct se_cmd *cmd,
5951146d
AG		 2185 struct scatterlist *sgl,
2186 u32 sgl_count,
2187 struct scatterlist *sgl_bidi,
2188 u32 sgl_bidi_count)
c66ac9db 2189{
5951146d 2190 if (!sgl || !sgl_count)
c66ac9db 2191 return 0;
c66ac9db 2192
64f1db38
CH		 2193 /*
2194 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2195 * scatterlists already have been set to follow what the fabric
2196 * passes for the original expected data transfer length.
2197 */
2198 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2199 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2200 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2201 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2202 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2203 return -EINVAL;
2204 }
c66ac9db 2205
64f1db38
CH		 2206 cmd->t_data_sg = sgl;
2207 cmd->t_data_nents = sgl_count;
c66ac9db 2208
64f1db38
CH		 2209 if (sgl_bidi && sgl_bidi_count) {
2210 cmd->t_bidi_data_sg = sgl_bidi;
2211 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db 2212 }
64f1db38 2213 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 2214 return 0;
2215}
2216EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2217
4949314c 2218void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2219{
ec98f782 2220 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2221 struct page **pages;
2222 int i;
05d1c7c0 2223
ec98f782 2224 BUG_ON(!sg);
05d1c7c0 2225 /*
ec98f782
AG		 2226 * We need to take into account a possible offset here for fabrics like
2227 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2228 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2229 */
4949314c
AG		 2230 if (!cmd->t_data_nents)
2231 return NULL;
2232 else if (cmd->t_data_nents == 1)
2233 return kmap(sg_page(sg)) + sg->offset;
2234
2235 /* >1 page. use vmap */
2236 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2237 if (!pages)
2238 return NULL;
2239
2240 /* convert sg[] to pages[] */
2241 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2242 pages[i] = sg_page(sg);
2243 }
2244
2245 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2246 kfree(pages);
2247 if (!cmd->t_data_vmap)
2248 return NULL;
2249
2250 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2251}
4949314c 2252EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2253
4949314c 2254void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2255{
a1edf9cf 2256 if (!cmd->t_data_nents) {
4949314c 2257 return;
a1edf9cf 2258 } else if (cmd->t_data_nents == 1) {
4949314c 2259 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2260 return;
2261 }
4949314c
AG		 2262
2263 vunmap(cmd->t_data_vmap);
2264 cmd->t_data_vmap = NULL;
05d1c7c0 2265}
4949314c 2266EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2267
c66ac9db 2268static int
05d1c7c0 2269transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2270{
ec98f782
AG		 2271 u32 length = cmd->data_length;
2272 unsigned int nents;
2273 struct page *page;
9db9da33 2274 gfp_t zero_flag;
ec98f782 2275 int i = 0;
c66ac9db 2276
ec98f782
AG		 2277 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2278 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2279 if (!cmd->t_data_sg)
2280 return -ENOMEM;
c66ac9db 2281
ec98f782
AG		 2282 cmd->t_data_nents = nents;
2283 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2284
64f1db38 2285 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2286
ec98f782
AG		 2287 while (length) {
2288 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2289 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2290 if (!page)
2291 goto out;
c66ac9db 2292
ec98f782
AG		 2293 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2294 length -= page_len;
2295 i++;
c66ac9db 2296 }
c66ac9db 2297 return 0;
c66ac9db 2298
ec98f782 2299out:
d0e27c88 2300 while (i > 0) {
ec98f782 2301 i--;
d0e27c88 2302 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2303 }
ec98f782
AG		 2304 kfree(cmd->t_data_sg);
2305 cmd->t_data_sg = NULL;
2306 return -ENOMEM;
c66ac9db
NB		 2307}
2308
da0f7619 2309/*
b16a35b0
AG		 2310 * Allocate any required resources to execute the command. For writes we
2311 * might not have the payload yet, so notify the fabric via a call to
2312 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2313 */
a1d8b49a 2314int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2315{
c66ac9db
NB		 2316 int ret = 0;
2317
2318 /*
2319 * Determine is the TCM fabric module has already allocated physical
2320 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2321 * beforehand.
c66ac9db 2322 */
ec98f782
AG		 2323 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2324 cmd->data_length) {
05d1c7c0 2325 ret = transport_generic_get_mem(cmd);
c66ac9db 2326 if (ret < 0)
03e98c9e 2327 goto out_fail;
c66ac9db 2328 }
74f4cf29
NB		 2329 /*
2330 * If this command doesn't have any payload and we don't have to call
2331 * into the fabric for data transfers, go ahead and complete it right
2332 * away.
2333 */
2334 if (!cmd->data_length) {
7d680f3b 2335 spin_lock_irq(&cmd->t_state_lock);
410f6702 2336 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 2337 cmd->transport_state |= CMD_T_ACTIVE;
2338 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 2339
2340 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2341 u8 ua_asc = 0, ua_ascq = 0;
2342
2343 core_scsi3_ua_clear_for_request_sense(cmd,
2344 &ua_asc, &ua_ascq);
2345 }
2346
410f6702
RD		 2347 INIT_WORK(&cmd->work, target_complete_ok_work);
2348 queue_work(target_completion_wq, &cmd->work);
2349 return 0;
2350 }
da0f7619 2351
4101f0a8 2352 atomic_inc(&cmd->t_fe_count);
4101f0a8 2353
c66ac9db 2354 /*
c3196f0c
CH		 2355 * If this command is not a write we can execute it right here,
2356 * for write buffers we need to notify the fabric driver first
2357 * and let it call back once the write buffers are ready.
c66ac9db 2358 */
5f41a31d 2359 target_add_to_state_list(cmd);
c3196f0c
CH		 2360 if (cmd->data_direction != DMA_TO_DEVICE) {
2361 target_execute_cmd(cmd);
2362 return 0;
2363 }
2364
2365 spin_lock_irq(&cmd->t_state_lock);
2366 cmd->t_state = TRANSPORT_WRITE_PENDING;
2367 spin_unlock_irq(&cmd->t_state_lock);
2368
2369 transport_cmd_check_stop(cmd, false);
2370
2371 ret = cmd->se_tfo->write_pending(cmd);
2372 if (ret == -EAGAIN || ret == -ENOMEM)
2373 goto queue_full;
2374
2375 if (ret < 0)
2376 return ret;
2377 return 1;
da0f7619
CH		 2378
2379out_fail:
2380 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2381 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2382 return -EINVAL;
c3196f0c
CH		 2383queue_full:
2384 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2385 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2386 transport_handle_queue_full(cmd, cmd->se_dev);
2387 return 0;
c66ac9db 2388}
a1d8b49a 2389EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2390
e057f533 2391static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2392{
f147abb4
NB		 2393 int ret;
2394
2395 ret = cmd->se_tfo->write_pending(cmd);
2396 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2397 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2398 cmd);
2399 transport_handle_queue_full(cmd, cmd->se_dev);
2400 }
07bde79a
NB		 2401}
2402
39c05f32 2403void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2404{
d14921d6 2405 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2406 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2407 transport_wait_for_tasks(cmd);
2408
35462975 2409 transport_release_cmd(cmd);
d14921d6
NB		 2410 } else {
2411 if (wait_for_tasks)
2412 transport_wait_for_tasks(cmd);
2413
c66ac9db
NB		 2414 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2415
82f1c8a4 2416 if (cmd->se_lun)
c66ac9db 2417 transport_lun_remove_cmd(cmd);
c66ac9db 2418
39c05f32 2419 transport_put_cmd(cmd);
c66ac9db
NB		 2420 }
2421}
2422EXPORT_SYMBOL(transport_generic_free_cmd);
2423
a17f091d
NB		 2424/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2425 * @se_sess: session to reference
2426 * @se_cmd: command descriptor to add
a6360785 2427 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2428 */
bc187ea6
RD		 2429static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2430 bool ack_kref)
a17f091d
NB		 2431{
2432 unsigned long flags;
bc187ea6 2433 int ret = 0;
a17f091d 2434
7481deb4 2435 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2436 /*
2437 * Add a second kref if the fabric caller is expecting to handle
2438 * fabric acknowledgement that requires two target_put_sess_cmd()
2439 * invocations before se_cmd descriptor release.
2440 */
86715569 2441 if (ack_kref == true) {
a6360785 2442 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2443 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2444 }
7481deb4 2445
a17f091d 2446 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2447 if (se_sess->sess_tearing_down) {
2448 ret = -ESHUTDOWN;
2449 goto out;
2450 }
a17f091d
NB		 2451 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2452 se_cmd->check_release = 1;
bc187ea6
RD		 2453
2454out:
a17f091d 2455 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2456 return ret;
a17f091d 2457}
a17f091d 2458
7481deb4 2459static void target_release_cmd_kref(struct kref *kref)
a17f091d 2460{
7481deb4
NB		 2461 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2462 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2463 unsigned long flags;
2464
2465 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2466 if (list_empty(&se_cmd->se_cmd_list)) {
2467 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2468 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2469 return;
a17f091d 2470 }
a17f091d
NB		 2471 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2472 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2473 complete(&se_cmd->cmd_wait_comp);
7481deb4 2474 return;
a17f091d
NB		 2475 }
2476 list_del(&se_cmd->se_cmd_list);
2477 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2478
7481deb4
NB		 2479 se_cmd->se_tfo->release_cmd(se_cmd);
2480}
2481
2482/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2483 * @se_sess: session to reference
2484 * @se_cmd: command descriptor to drop
2485 */
2486int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2487{
2488 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2489}
2490EXPORT_SYMBOL(target_put_sess_cmd);
2491
1c7b13fe
RD		 2492/* target_sess_cmd_list_set_waiting - Flag all commands in
2493 * sess_cmd_list to complete cmd_wait_comp. Set
2494 * sess_tearing_down so no more commands are queued.
2495 * @se_sess: session to flag
a17f091d 2496 */
1c7b13fe 2497void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2498{
2499 struct se_cmd *se_cmd;
2500 unsigned long flags;
2501
a17f091d 2502 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2503
1c7b13fe
RD		 2504 WARN_ON(se_sess->sess_tearing_down);
2505 se_sess->sess_tearing_down = 1;
a17f091d 2506
1c7b13fe 2507 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
a17f091d
NB		 2508 se_cmd->cmd_wait_set = 1;
2509
2510 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2511}
1c7b13fe 2512EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2513
2514/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2515 * @se_sess: session to wait for active I/O
2516 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2517 */
2518void target_wait_for_sess_cmds(
2519 struct se_session *se_sess,
2520 int wait_for_tasks)
2521{
2522 struct se_cmd *se_cmd, *tmp_cmd;
2523 bool rc = false;
2524
2525 list_for_each_entry_safe(se_cmd, tmp_cmd,
1c7b13fe 2526 &se_sess->sess_cmd_list, se_cmd_list) {
a17f091d
NB		 2527 list_del(&se_cmd->se_cmd_list);
2528
2529 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2530 " %d\n", se_cmd, se_cmd->t_state,
2531 se_cmd->se_tfo->get_cmd_state(se_cmd));
2532
2533 if (wait_for_tasks) {
2534 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2535 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2536 se_cmd->se_tfo->get_cmd_state(se_cmd));
2537
2538 rc = transport_wait_for_tasks(se_cmd);
2539
2540 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2541 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2542 se_cmd->se_tfo->get_cmd_state(se_cmd));
2543 }
2544
2545 if (!rc) {
2546 wait_for_completion(&se_cmd->cmd_wait_comp);
2547 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2548 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2549 se_cmd->se_tfo->get_cmd_state(se_cmd));
2550 }
2551
2552 se_cmd->se_tfo->release_cmd(se_cmd);
2553 }
2554}
2555EXPORT_SYMBOL(target_wait_for_sess_cmds);
2556
c66ac9db
NB		 2557/* transport_lun_wait_for_tasks():
2558 *
2559 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2560 * an struct se_lun to be successfully shutdown.
2561 */
2562static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2563{
2564 unsigned long flags;
cf572a96
CH		 2565 int ret = 0;
2566
c66ac9db
NB		 2567 /*
2568 * If the frontend has already requested this struct se_cmd to
2569 * be stopped, we can safely ignore this struct se_cmd.
2570 */
a1d8b49a 2571 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2572 if (cmd->transport_state & CMD_T_STOP) {
2573 cmd->transport_state &= ~CMD_T_LUN_STOP;
2574
2575 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2576 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2577 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2578 transport_cmd_check_stop(cmd, false);
e3d6f909 2579 return -EPERM;
c66ac9db 2580 }
7d680f3b 2581 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2582 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2583
cf572a96
CH		 2584 // XXX: audit task_flags checks.
2585 spin_lock_irqsave(&cmd->t_state_lock, flags);
2586 if ((cmd->transport_state & CMD_T_BUSY) &&
2587 (cmd->transport_state & CMD_T_SENT)) {
2588 if (!target_stop_cmd(cmd, &flags))
2589 ret++;
cf572a96 2590 }
5f41a31d 2591 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2592
785fdf70
CH		 2593 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2594 " %d\n", cmd, ret);
c66ac9db 2595 if (!ret) {
6708bb27 2596 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2597 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2598 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2599 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2600 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2601 }
c66ac9db
NB		 2602
2603 return 0;
2604}
2605
c66ac9db
NB		 2606static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2607{
2608 struct se_cmd *cmd = NULL;
2609 unsigned long lun_flags, cmd_flags;
2610 /*
2611 * Do exception processing and return CHECK_CONDITION status to the
2612 * Initiator Port.
2613 */
2614 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2615 while (!list_empty(&lun->lun_cmd_list)) {
2616 cmd = list_first_entry(&lun->lun_cmd_list,
2617 struct se_cmd, se_lun_node);
3d26fea0 2618 list_del_init(&cmd->se_lun_node);
5951146d 2619
a1d8b49a 2620 spin_lock(&cmd->t_state_lock);
6708bb27 2621 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2622 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2623 cmd->se_lun->unpacked_lun,
2624 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2625 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2626 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2627
2628 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2629
6708bb27
AG		 2630 if (!cmd->se_lun) {
2631 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2632 cmd->se_tfo->get_task_tag(cmd),
2633 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2634 BUG();
2635 }
2636 /*
2637 * If the Storage engine still owns the iscsi_cmd_t, determine
2638 * and/or stop its context.
2639 */
6708bb27 2640 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2641 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2642 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2643
e3d6f909 2644 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2645 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2646 continue;
2647 }
2648
6708bb27 2649 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2650 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2651 cmd->se_lun->unpacked_lun,
2652 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2653
a1d8b49a 2654 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2655 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2656 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2657 goto check_cond;
2658 }
7d680f3b 2659 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2660 target_remove_from_state_list(cmd);
a1d8b49a 2661 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2662
c66ac9db
NB		 2663 /*
2664 * The Storage engine stopped this struct se_cmd before it was
2665 * send to the fabric frontend for delivery back to the
2666 * Initiator Node. Return this SCSI CDB back with an
2667 * CHECK_CONDITION status.
2668 */
2669check_cond:
2670 transport_send_check_condition_and_sense(cmd,
2671 TCM_NON_EXISTENT_LUN, 0);
2672 /*
2673 * If the fabric frontend is waiting for this iscsi_cmd_t to
2674 * be released, notify the waiting thread now that LU has
2675 * finished accessing it.
2676 */
a1d8b49a 2677 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2678 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2679 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2680 " struct se_cmd: %p ITT: 0x%08x\n",
2681 lun->unpacked_lun,
e3d6f909 2682 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2683
a1d8b49a 2684 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2685 cmd_flags);
f7113a47 2686 transport_cmd_check_stop(cmd, false);
a1d8b49a 2687 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2688 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2689 continue;
2690 }
6708bb27 2691 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2692 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2693
a1d8b49a 2694 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2695 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2696 }
2697 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2698}
2699
2700static int transport_clear_lun_thread(void *p)
2701{
8359cf43 2702 struct se_lun *lun = p;
c66ac9db
NB		 2703
2704 __transport_clear_lun_from_sessions(lun);
2705 complete(&lun->lun_shutdown_comp);
2706
2707 return 0;
2708}
2709
2710int transport_clear_lun_from_sessions(struct se_lun *lun)
2711{
2712 struct task_struct *kt;
2713
5951146d 2714 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2715 "tcm_cl_%u", lun->unpacked_lun);
2716 if (IS_ERR(kt)) {
6708bb27 2717 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2718 return PTR_ERR(kt);
c66ac9db
NB		 2719 }
2720 wait_for_completion(&lun->lun_shutdown_comp);
2721
2722 return 0;
2723}
2724
d14921d6
NB		 2725/**
2726 * transport_wait_for_tasks - wait for completion to occur
2727 * @cmd: command to wait
c66ac9db 2728 *
d14921d6
NB		 2729 * Called from frontend fabric context to wait for storage engine
2730 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2731 */
a17f091d 2732bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2733{
2734 unsigned long flags;
2735
a1d8b49a 2736 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2737 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2738 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2739 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2740 return false;
d14921d6 2741 }
cb4f4d3c 2742
c8e31f26
AG		 2743 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2744 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2745 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2746 return false;
d14921d6 2747 }
c66ac9db
NB		 2748 /*
2749 * If we are already stopped due to an external event (ie: LUN shutdown)
2750 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2751 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2752 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2753 * has completed its operation on the struct se_cmd.
2754 */
7d680f3b 2755 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2756 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2757 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2758 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2759 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2760 /*
2761 * There is a special case for WRITES where a FE exception +
2762 * LUN shutdown means ConfigFS context is still sleeping on
2763 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2764 * We go ahead and up transport_lun_stop_comp just to be sure
2765 * here.
2766 */
a1d8b49a
AG		 2767 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2768 complete(&cmd->transport_lun_stop_comp);
2769 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2770 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2771
cf572a96 2772 target_remove_from_state_list(cmd);
c66ac9db
NB		 2773 /*
2774 * At this point, the frontend who was the originator of this
2775 * struct se_cmd, now owns the structure and can be released through
2776 * normal means below.
2777 */
6708bb27 2778 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2779 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2780 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2781 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2782
7d680f3b 2783 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2784 }
7d680f3b 2785
3d28934a 2786 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2787 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2788 return false;
d14921d6 2789 }
c66ac9db 2790
7d680f3b 2791 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2792
6708bb27 2793 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2794 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2795 cmd, cmd->se_tfo->get_task_tag(cmd),
2796 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2797
a1d8b49a 2798 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2799
a1d8b49a 2800 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2801
a1d8b49a 2802 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2803 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2804
6708bb27 2805 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 2806 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2807 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2808
d14921d6 2809 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2810
2811 return true;
c66ac9db 2812}
d14921d6 2813EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2814
2815static int transport_get_sense_codes(
2816 struct se_cmd *cmd,
2817 u8 *asc,
2818 u8 *ascq)
2819{
2820 *asc = cmd->scsi_asc;
2821 *ascq = cmd->scsi_ascq;
2822
2823 return 0;
2824}
2825
2826static int transport_set_sense_codes(
2827 struct se_cmd *cmd,
2828 u8 asc,
2829 u8 ascq)
2830{
2831 cmd->scsi_asc = asc;
2832 cmd->scsi_ascq = ascq;
2833
2834 return 0;
2835}
2836
2837int transport_send_check_condition_and_sense(
2838 struct se_cmd *cmd,
2839 u8 reason,
2840 int from_transport)
2841{
2842 unsigned char *buffer = cmd->sense_buffer;
2843 unsigned long flags;
2844 int offset;
2845 u8 asc = 0, ascq = 0;
2846
a1d8b49a 2847 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2848 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2849 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2850 return 0;
2851 }
2852 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2853 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2854
2855 if (!reason && from_transport)
2856 goto after_reason;
2857
2858 if (!from_transport)
2859 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2860 /*
2861 * Data Segment and SenseLength of the fabric response PDU.
2862 *
2863 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2864 * from include/scsi/scsi_cmnd.h
2865 */
e3d6f909 2866 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2867 TRANSPORT_SENSE_BUFFER);
2868 /*
2869 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2870 * SENSE KEY values from include/scsi/scsi.h
2871 */
2872 switch (reason) {
2873 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 2874 /* CURRENT ERROR */
2875 buffer[offset] = 0x70;
895f3022 2876 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 2877 /* ILLEGAL REQUEST */
2878 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2879 /* LOGICAL UNIT NOT SUPPORTED */
2880 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2881 break;
c66ac9db
NB		 2882 case TCM_UNSUPPORTED_SCSI_OPCODE:
2883 case TCM_SECTOR_COUNT_TOO_MANY:
2884 /* CURRENT ERROR */
2885 buffer[offset] = 0x70;
895f3022 2886 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2887 /* ILLEGAL REQUEST */
2888 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2889 /* INVALID COMMAND OPERATION CODE */
2890 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2891 break;
2892 case TCM_UNKNOWN_MODE_PAGE:
2893 /* CURRENT ERROR */
2894 buffer[offset] = 0x70;
895f3022 2895 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2896 /* ILLEGAL REQUEST */
2897 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2898 /* INVALID FIELD IN CDB */
2899 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2900 break;
2901 case TCM_CHECK_CONDITION_ABORT_CMD:
2902 /* CURRENT ERROR */
2903 buffer[offset] = 0x70;
895f3022 2904 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2905 /* ABORTED COMMAND */
2906 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2907 /* BUS DEVICE RESET FUNCTION OCCURRED */
2908 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2909 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2910 break;
2911 case TCM_INCORRECT_AMOUNT_OF_DATA:
2912 /* CURRENT ERROR */
2913 buffer[offset] = 0x70;
895f3022 2914 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2915 /* ABORTED COMMAND */
2916 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2917 /* WRITE ERROR */
2918 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2919 /* NOT ENOUGH UNSOLICITED DATA */
2920 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2921 break;
2922 case TCM_INVALID_CDB_FIELD:
2923 /* CURRENT ERROR */
2924 buffer[offset] = 0x70;
895f3022 2925 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 2926 /* ILLEGAL REQUEST */
2927 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 2928 /* INVALID FIELD IN CDB */
2929 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2930 break;
2931 case TCM_INVALID_PARAMETER_LIST:
2932 /* CURRENT ERROR */
2933 buffer[offset] = 0x70;
895f3022 2934 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 2935 /* ILLEGAL REQUEST */
2936 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 2937 /* INVALID FIELD IN PARAMETER LIST */
2938 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2939 break;
2940 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2941 /* CURRENT ERROR */
2942 buffer[offset] = 0x70;
895f3022 2943 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2944 /* ABORTED COMMAND */
2945 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2946 /* WRITE ERROR */
2947 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2948 /* UNEXPECTED_UNSOLICITED_DATA */
2949 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2950 break;
2951 case TCM_SERVICE_CRC_ERROR:
2952 /* CURRENT ERROR */
2953 buffer[offset] = 0x70;
895f3022 2954 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2955 /* ABORTED COMMAND */
2956 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2957 /* PROTOCOL SERVICE CRC ERROR */
2958 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2959 /* N/A */
2960 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2961 break;
2962 case TCM_SNACK_REJECTED:
2963 /* CURRENT ERROR */
2964 buffer[offset] = 0x70;
895f3022 2965 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2966 /* ABORTED COMMAND */
2967 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2968 /* READ ERROR */
2969 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2970 /* FAILED RETRANSMISSION REQUEST */
2971 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2972 break;
2973 case TCM_WRITE_PROTECTED:
2974 /* CURRENT ERROR */
2975 buffer[offset] = 0x70;
895f3022 2976 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2977 /* DATA PROTECT */
2978 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2979 /* WRITE PROTECTED */
2980 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2981 break;
e2397c70
RD		 2982 case TCM_ADDRESS_OUT_OF_RANGE:
2983 /* CURRENT ERROR */
2984 buffer[offset] = 0x70;
2985 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2986 /* ILLEGAL REQUEST */
2987 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2988 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2989 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2990 break;
c66ac9db
NB		 2991 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2992 /* CURRENT ERROR */
2993 buffer[offset] = 0x70;
895f3022 2994 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2995 /* UNIT ATTENTION */
2996 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2997 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2998 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2999 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3000 break;
3001 case TCM_CHECK_CONDITION_NOT_READY:
3002 /* CURRENT ERROR */
3003 buffer[offset] = 0x70;
895f3022 3004 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3005 /* Not Ready */
3006 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3007 transport_get_sense_codes(cmd, &asc, &ascq);
3008 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3009 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3010 break;
3011 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3012 default:
3013 /* CURRENT ERROR */
3014 buffer[offset] = 0x70;
895f3022 3015 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3016 /* ILLEGAL REQUEST */
3017 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3018 /* LOGICAL UNIT COMMUNICATION FAILURE */
3019 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3020 break;
3021 }
3022 /*
3023 * This code uses linux/include/scsi/scsi.h SAM status codes!
3024 */
3025 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3026 /*
3027 * Automatically padded, this value is encoded in the fabric's
3028 * data_length response PDU containing the SCSI defined sense data.
3029 */
3030 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3031
3032after_reason:
07bde79a 3033 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3034}
3035EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3036
3037int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3038{
3039 int ret = 0;
3040
7d680f3b 3041 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 3042 if (!send_status ||
c66ac9db
NB		 3043 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3044 return 1;
8b1e1244 3045
6708bb27 3046 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 3047 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 3048 cmd->t_task_cdb[0],
e3d6f909 3049 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3050
c66ac9db 3051 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 3052 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3053 ret = 1;
3054 }
3055 return ret;
3056}
3057EXPORT_SYMBOL(transport_check_aborted_status);
3058
3059void transport_send_task_abort(struct se_cmd *cmd)
3060{
c252f003
NB		 3061 unsigned long flags;
3062
3063 spin_lock_irqsave(&cmd->t_state_lock, flags);
3064 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3065 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3066 return;
3067 }
3068 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3069
c66ac9db
NB		 3070 /*
3071 * If there are still expected incoming fabric WRITEs, we wait
3072 * until until they have completed before sending a TASK_ABORTED
3073 * response. This response with TASK_ABORTED status will be
3074 * queued back to fabric module by transport_check_aborted_status().
3075 */
3076 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3077 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 3078 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 3079 smp_mb__after_atomic_inc();
c66ac9db
NB		 3080 }
3081 }
3082 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3083
6708bb27 3084 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 3085 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 3086 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3087
e3d6f909 3088 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3089}
3090
af877292 3091static void target_tmr_work(struct work_struct *work)
c66ac9db 3092{
af877292 3093 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3094 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3095 struct se_tmr_req *tmr = cmd->se_tmr_req;
3096 int ret;
3097
3098 switch (tmr->function) {
5c6cd613 3099 case TMR_ABORT_TASK:
3d28934a 3100 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3101 break;
5c6cd613
NB		 3102 case TMR_ABORT_TASK_SET:
3103 case TMR_CLEAR_ACA:
3104 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3105 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3106 break;
5c6cd613 3107 case TMR_LUN_RESET:
c66ac9db
NB		 3108 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3109 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3110 TMR_FUNCTION_REJECTED;
3111 break;
5c6cd613 3112 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3113 tmr->response = TMR_FUNCTION_REJECTED;
3114 break;
5c6cd613 3115 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3116 tmr->response = TMR_FUNCTION_REJECTED;
3117 break;
c66ac9db 3118 default:
6708bb27 3119 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3120 tmr->function);
3121 tmr->response = TMR_FUNCTION_REJECTED;
3122 break;
3123 }
3124
3125 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3126 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3127
b7b8bef7 3128 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3129}
3130
af877292
CH		 3131int transport_generic_handle_tmr(
3132 struct se_cmd *cmd)
c66ac9db 3133{
af877292
CH		 3134 INIT_WORK(&cmd->work, target_tmr_work);
3135 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3136 return 0;
3137}
af877292 3138EXPORT_SYMBOL(transport_generic_handle_tmr);