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Merge remote-tracking branch 'regmap/fix/debugfs' into regmap-linus
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
fd9a11d7 6 * (c) Copyright 2002-2012 RisingTide Systems LLC.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
31#include <linux/blkdev.h>
32#include <linux/spinlock.h>
c66ac9db
NB		 33#include <linux/kthread.h>
34#include <linux/in.h>
35#include <linux/cdrom.h>
827509e3 36#include <linux/module.h>
015487b8 37#include <linux/ratelimit.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_cmnd.h>
e66ecd50 43#include <scsi/scsi_tcq.h>
c66ac9db
NB		 44
45#include <target/target_core_base.h>
c4795fb2
CH		 46#include <target/target_core_backend.h>
47#include <target/target_core_fabric.h>
c66ac9db
NB		 48#include <target/target_core_configfs.h>
49
e26d99ae 50#include "target_core_internal.h"
c66ac9db 51#include "target_core_alua.h"
c66ac9db 52#include "target_core_pr.h"
c66ac9db
NB		 53#include "target_core_ua.h"
54
35e0e757 55static struct workqueue_struct *target_completion_wq;
c66ac9db 56static struct kmem_cache *se_sess_cache;
c66ac9db 57struct kmem_cache *se_ua_cache;
c66ac9db
NB		 58struct kmem_cache *t10_pr_reg_cache;
59struct kmem_cache *t10_alua_lu_gp_cache;
60struct kmem_cache *t10_alua_lu_gp_mem_cache;
61struct kmem_cache *t10_alua_tg_pt_gp_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
63
c66ac9db 64static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 65static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 66 struct se_device *dev);
05d1c7c0 67static int transport_generic_get_mem(struct se_cmd *cmd);
d5ddad41 68static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 69static void target_complete_ok_work(struct work_struct *work);
c66ac9db 70
e3d6f909 71int init_se_kmem_caches(void)
c66ac9db 72{
c66ac9db
NB		 73 se_sess_cache = kmem_cache_create("se_sess_cache",
74 sizeof(struct se_session), __alignof__(struct se_session),
75 0, NULL);
6708bb27
AG		 76 if (!se_sess_cache) {
77 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 78 " failed\n");
c8e31f26 79 goto out;
c66ac9db
NB		 80 }
81 se_ua_cache = kmem_cache_create("se_ua_cache",
82 sizeof(struct se_ua), __alignof__(struct se_ua),
83 0, NULL);
6708bb27
AG		 84 if (!se_ua_cache) {
85 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 86 goto out_free_sess_cache;
c66ac9db 87 }
c66ac9db
NB		 88 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
89 sizeof(struct t10_pr_registration),
90 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 91 if (!t10_pr_reg_cache) {
92 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 93 " failed\n");
35e0e757 94 goto out_free_ua_cache;
c66ac9db
NB		 95 }
96 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
97 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
98 0, NULL);
6708bb27
AG		 99 if (!t10_alua_lu_gp_cache) {
100 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 101 " failed\n");
35e0e757 102 goto out_free_pr_reg_cache;
c66ac9db
NB		 103 }
104 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
105 sizeof(struct t10_alua_lu_gp_member),
106 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 107 if (!t10_alua_lu_gp_mem_cache) {
108 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 109 "cache failed\n");
35e0e757 110 goto out_free_lu_gp_cache;
c66ac9db
NB		 111 }
112 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
113 sizeof(struct t10_alua_tg_pt_gp),
114 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 115 if (!t10_alua_tg_pt_gp_cache) {
116 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 117 "cache failed\n");
35e0e757 118 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 119 }
120 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
121 "t10_alua_tg_pt_gp_mem_cache",
122 sizeof(struct t10_alua_tg_pt_gp_member),
123 __alignof__(struct t10_alua_tg_pt_gp_member),
124 0, NULL);
6708bb27
AG		 125 if (!t10_alua_tg_pt_gp_mem_cache) {
126 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 127 "mem_t failed\n");
35e0e757 128 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 129 }
130
35e0e757
CH		 131 target_completion_wq = alloc_workqueue("target_completion",
132 WQ_MEM_RECLAIM, 0);
133 if (!target_completion_wq)
134 goto out_free_tg_pt_gp_mem_cache;
135
c66ac9db 136 return 0;
35e0e757
CH		 137
138out_free_tg_pt_gp_mem_cache:
139 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
140out_free_tg_pt_gp_cache:
141 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
142out_free_lu_gp_mem_cache:
143 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
144out_free_lu_gp_cache:
145 kmem_cache_destroy(t10_alua_lu_gp_cache);
146out_free_pr_reg_cache:
147 kmem_cache_destroy(t10_pr_reg_cache);
148out_free_ua_cache:
149 kmem_cache_destroy(se_ua_cache);
150out_free_sess_cache:
151 kmem_cache_destroy(se_sess_cache);
c66ac9db 152out:
e3d6f909 153 return -ENOMEM;
c66ac9db
NB		 154}
155
e3d6f909 156void release_se_kmem_caches(void)
c66ac9db 157{
35e0e757 158 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 159 kmem_cache_destroy(se_sess_cache);
160 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 161 kmem_cache_destroy(t10_pr_reg_cache);
162 kmem_cache_destroy(t10_alua_lu_gp_cache);
163 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
164 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
165 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 166}
167
e3d6f909
AG		 168/* This code ensures unique mib indexes are handed out. */
169static DEFINE_SPINLOCK(scsi_mib_index_lock);
170static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 171
172/*
173 * Allocate a new row index for the entry type specified
174 */
175u32 scsi_get_new_index(scsi_index_t type)
176{
177 u32 new_index;
178
e3d6f909 179 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 180
e3d6f909
AG		 181 spin_lock(&scsi_mib_index_lock);
182 new_index = ++scsi_mib_index[type];
183 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 184
185 return new_index;
186}
187
dbc5623e 188void transport_subsystem_check_init(void)
c66ac9db
NB		 189{
190 int ret;
283669d2 191 static int sub_api_initialized;
c66ac9db 192
dbc5623e
NB		 193 if (sub_api_initialized)
194 return;
195
c66ac9db
NB		 196 ret = request_module("target_core_iblock");
197 if (ret != 0)
6708bb27 198 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 199
200 ret = request_module("target_core_file");
201 if (ret != 0)
6708bb27 202 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 203
204 ret = request_module("target_core_pscsi");
205 if (ret != 0)
6708bb27 206 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 207
e3d6f909 208 sub_api_initialized = 1;
c66ac9db
NB		 209}
210
211struct se_session *transport_init_session(void)
212{
213 struct se_session *se_sess;
214
215 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 216 if (!se_sess) {
217 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 218 " se_sess_cache\n");
219 return ERR_PTR(-ENOMEM);
220 }
221 INIT_LIST_HEAD(&se_sess->sess_list);
222 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 223 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 224 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 225 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 226 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 227
228 return se_sess;
229}
230EXPORT_SYMBOL(transport_init_session);
231
232/*
140854cb 233 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 234 */
235void __transport_register_session(
236 struct se_portal_group *se_tpg,
237 struct se_node_acl *se_nacl,
238 struct se_session *se_sess,
239 void *fabric_sess_ptr)
240{
241 unsigned char buf[PR_REG_ISID_LEN];
242
243 se_sess->se_tpg = se_tpg;
244 se_sess->fabric_sess_ptr = fabric_sess_ptr;
245 /*
246 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
247 *
248 * Only set for struct se_session's that will actually be moving I/O.
249 * eg: *NOT* discovery sessions.
250 */
251 if (se_nacl) {
252 /*
253 * If the fabric module supports an ISID based TransportID,
254 * save this value in binary from the fabric I_T Nexus now.
255 */
e3d6f909 256 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 257 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 258 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 259 &buf[0], PR_REG_ISID_LEN);
260 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
261 }
afb999ff
NB		 262 kref_get(&se_nacl->acl_kref);
263
c66ac9db
NB		 264 spin_lock_irq(&se_nacl->nacl_sess_lock);
265 /*
266 * The se_nacl->nacl_sess pointer will be set to the
267 * last active I_T Nexus for each struct se_node_acl.
268 */
269 se_nacl->nacl_sess = se_sess;
270
271 list_add_tail(&se_sess->sess_acl_list,
272 &se_nacl->acl_sess_list);
273 spin_unlock_irq(&se_nacl->nacl_sess_lock);
274 }
275 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
276
6708bb27 277 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 278 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 279}
280EXPORT_SYMBOL(__transport_register_session);
281
282void transport_register_session(
283 struct se_portal_group *se_tpg,
284 struct se_node_acl *se_nacl,
285 struct se_session *se_sess,
286 void *fabric_sess_ptr)
287{
140854cb
NB		 288 unsigned long flags;
289
290 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 291 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 292 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 293}
294EXPORT_SYMBOL(transport_register_session);
295
ecf0dd66 296static void target_release_session(struct kref *kref)
41ac82b6
NB		 297{
298 struct se_session *se_sess = container_of(kref,
299 struct se_session, sess_kref);
300 struct se_portal_group *se_tpg = se_sess->se_tpg;
301
302 se_tpg->se_tpg_tfo->close_session(se_sess);
303}
304
305void target_get_session(struct se_session *se_sess)
306{
307 kref_get(&se_sess->sess_kref);
308}
309EXPORT_SYMBOL(target_get_session);
310
33933a0e 311void target_put_session(struct se_session *se_sess)
41ac82b6 312{
4149268e
JE		 313 struct se_portal_group *tpg = se_sess->se_tpg;
314
315 if (tpg->se_tpg_tfo->put_session != NULL) {
316 tpg->se_tpg_tfo->put_session(se_sess);
317 return;
318 }
33933a0e 319 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 320}
321EXPORT_SYMBOL(target_put_session);
322
afb999ff
NB		 323static void target_complete_nacl(struct kref *kref)
324{
325 struct se_node_acl *nacl = container_of(kref,
326 struct se_node_acl, acl_kref);
327
328 complete(&nacl->acl_free_comp);
329}
330
331void target_put_nacl(struct se_node_acl *nacl)
332{
333 kref_put(&nacl->acl_kref, target_complete_nacl);
334}
335
c66ac9db
NB		 336void transport_deregister_session_configfs(struct se_session *se_sess)
337{
338 struct se_node_acl *se_nacl;
23388864 339 unsigned long flags;
c66ac9db
NB		 340 /*
341 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
342 */
343 se_nacl = se_sess->se_node_acl;
6708bb27 344 if (se_nacl) {
23388864 345 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 346 if (se_nacl->acl_stop == 0)
347 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 348 /*
349 * If the session list is empty, then clear the pointer.
350 * Otherwise, set the struct se_session pointer from the tail
351 * element of the per struct se_node_acl active session list.
352 */
353 if (list_empty(&se_nacl->acl_sess_list))
354 se_nacl->nacl_sess = NULL;
355 else {
356 se_nacl->nacl_sess = container_of(
357 se_nacl->acl_sess_list.prev,
358 struct se_session, sess_acl_list);
359 }
23388864 360 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 361 }
362}
363EXPORT_SYMBOL(transport_deregister_session_configfs);
364
365void transport_free_session(struct se_session *se_sess)
366{
367 kmem_cache_free(se_sess_cache, se_sess);
368}
369EXPORT_SYMBOL(transport_free_session);
370
371void transport_deregister_session(struct se_session *se_sess)
372{
373 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 374 struct target_core_fabric_ops *se_tfo;
c66ac9db 375 struct se_node_acl *se_nacl;
e63a8e19 376 unsigned long flags;
01468346 377 bool comp_nacl = true;
c66ac9db 378
6708bb27 379 if (!se_tpg) {
c66ac9db
NB		 380 transport_free_session(se_sess);
381 return;
382 }
01468346 383 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 384
e63a8e19 385 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 386 list_del(&se_sess->sess_list);
387 se_sess->se_tpg = NULL;
388 se_sess->fabric_sess_ptr = NULL;
e63a8e19 389 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 390
391 /*
392 * Determine if we need to do extra work for this initiator node's
393 * struct se_node_acl if it had been previously dynamically generated.
394 */
395 se_nacl = se_sess->se_node_acl;
01468346
NB		 396
397 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
398 if (se_nacl && se_nacl->dynamic_node_acl) {
399 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
400 list_del(&se_nacl->acl_list);
401 se_tpg->num_node_acls--;
402 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
403 core_tpg_wait_for_nacl_pr_ref(se_nacl);
404 core_free_device_list_for_node(se_nacl, se_tpg);
405 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
406
407 comp_nacl = false;
408 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 409 }
c66ac9db 410 }
01468346 411 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 412
6708bb27 413 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 414 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 415 /*
afb999ff
NB		 416 * If last kref is dropping now for an explict NodeACL, awake sleeping
417 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
418 * removal context.
01468346
NB		 419 */
420 if (se_nacl && comp_nacl == true)
afb999ff 421 target_put_nacl(se_nacl);
01468346 422
afb999ff 423 transport_free_session(se_sess);
c66ac9db
NB		 424}
425EXPORT_SYMBOL(transport_deregister_session);
426
427/*
a1d8b49a 428 * Called with cmd->t_state_lock held.
c66ac9db 429 */
cf572a96 430static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 431{
42bf829e 432 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 433 unsigned long flags;
434
42bf829e
CH		 435 if (!dev)
436 return;
c66ac9db 437
cf572a96
CH		 438 if (cmd->transport_state & CMD_T_BUSY)
439 return;
c66ac9db 440
cf572a96
CH		 441 spin_lock_irqsave(&dev->execute_task_lock, flags);
442 if (cmd->state_active) {
443 list_del(&cmd->state_list);
cf572a96 444 cmd->state_active = false;
c66ac9db 445 }
cf572a96 446 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 447}
448
f7113a47 449static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
c66ac9db
NB		 450{
451 unsigned long flags;
452
a1d8b49a 453 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 454 /*
455 * Determine if IOCTL context caller in requesting the stopping of this
456 * command for LUN shutdown purposes.
457 */
7d680f3b
CH		 458 if (cmd->transport_state & CMD_T_LUN_STOP) {
459 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
460 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 461
7d680f3b 462 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 463 if (remove_from_lists)
cf572a96 464 target_remove_from_state_list(cmd);
a1d8b49a 465 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 466
a1d8b49a 467 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 468 return 1;
469 }
f7113a47
CH		 470
471 if (remove_from_lists) {
472 target_remove_from_state_list(cmd);
473
474 /*
475 * Clear struct se_cmd->se_lun before the handoff to FE.
476 */
477 cmd->se_lun = NULL;
478 }
479
c66ac9db
NB		 480 /*
481 * Determine if frontend context caller is requesting the stopping of
e3d6f909 482 * this command for frontend exceptions.
c66ac9db 483 */
7d680f3b
CH		 484 if (cmd->transport_state & CMD_T_STOP) {
485 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
486 __func__, __LINE__,
e3d6f909 487 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 488
a1d8b49a 489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 490
a1d8b49a 491 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 492 return 1;
493 }
f7113a47
CH		 494
495 cmd->transport_state &= ~CMD_T_ACTIVE;
496 if (remove_from_lists) {
497 /*
498 * Some fabric modules like tcm_loop can release
499 * their internally allocated I/O reference now and
500 * struct se_cmd now.
501 *
502 * Fabric modules are expected to return '1' here if the
503 * se_cmd being passed is released at this point,
504 * or zero if not being released.
505 */
506 if (cmd->se_tfo->check_stop_free != NULL) {
507 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
508 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 509 }
f7113a47 510 }
c66ac9db 511
a1d8b49a 512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 513 return 0;
514}
515
516static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
517{
f7113a47 518 return transport_cmd_check_stop(cmd, true);
c66ac9db
NB		 519}
520
521static void transport_lun_remove_cmd(struct se_cmd *cmd)
522{
e3d6f909 523 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 524 unsigned long flags;
525
526 if (!lun)
527 return;
528
a1d8b49a 529 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 530 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
531 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 532 target_remove_from_state_list(cmd);
c66ac9db 533 }
a1d8b49a 534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 535
c66ac9db 536 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 537 if (!list_empty(&cmd->se_lun_node))
538 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 539 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
540}
541
542void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
543{
c66ac9db
NB		 544 if (transport_cmd_check_stop_to_fabric(cmd))
545 return;
af877292 546 if (remove)
e6a2573f 547 transport_put_cmd(cmd);
c66ac9db
NB		 548}
549
35e0e757
CH		 550static void target_complete_failure_work(struct work_struct *work)
551{
552 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
553
de103c93
CH		 554 transport_generic_request_failure(cmd,
555 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 556}
557
6138ed2a 558/*
d5829eac
PB		 559 * Used when asking transport to copy Sense Data from the underlying
560 * Linux/SCSI struct scsi_cmnd
6138ed2a 561 */
d5829eac 562static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 563{
6138ed2a 564 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 565
566 WARN_ON(!cmd->se_lun);
567
568 if (!dev)
d5829eac 569 return NULL;
6138ed2a 570
d5829eac
PB		 571 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
572 return NULL;
6138ed2a 573
9c58b7dd 574 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 575
d5829eac 576 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 577 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 578 return cmd->sense_buffer;
6138ed2a
PB		 579}
580
5787cacd 581void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 582{
42bf829e 583 struct se_device *dev = cmd->se_dev;
5787cacd 584 int success = scsi_status == GOOD;
c66ac9db 585 unsigned long flags;
c66ac9db 586
5787cacd
CH		 587 cmd->scsi_status = scsi_status;
588
589
a1d8b49a 590 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 591 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 592
c66ac9db 593 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 594 dev->transport->transport_complete(cmd,
595 cmd->t_data_sg,
596 transport_get_sense_buffer(cmd));
597 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 598 success = 1;
c66ac9db
NB		 599 }
600
601 /*
5787cacd 602 * See if we are waiting to complete for an exception condition.
c66ac9db 603 */
cf572a96 604 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 606 complete(&cmd->task_stop_comp);
c66ac9db
NB		 607 return;
608 }
2235007c
CH		 609
610 if (!success)
7d680f3b 611 cmd->transport_state |= CMD_T_FAILED;
2235007c 612
3d28934a
NB		 613 /*
614 * Check for case where an explict ABORT_TASK has been received
615 * and transport_wait_for_tasks() will be waiting for completion..
616 */
617 if (cmd->transport_state & CMD_T_ABORTED &&
618 cmd->transport_state & CMD_T_STOP) {
619 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
620 complete(&cmd->t_transport_stop_comp);
621 return;
622 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 623 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 624 } else {
35e0e757 625 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 626 }
35e0e757 627
35e0e757 628 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 629 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 631
35e0e757 632 queue_work(target_completion_wq, &cmd->work);
c66ac9db 633}
6bb35e00
CH		 634EXPORT_SYMBOL(target_complete_cmd);
635
cf572a96 636static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 637{
cf572a96
CH		 638 struct se_device *dev = cmd->se_dev;
639 unsigned long flags;
c66ac9db 640
cf572a96
CH		 641 spin_lock_irqsave(&dev->execute_task_lock, flags);
642 if (!cmd->state_active) {
643 list_add_tail(&cmd->state_list, &dev->state_list);
644 cmd->state_active = true;
c66ac9db 645 }
cf572a96 646 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 647}
648
07bde79a 649/*
f147abb4 650 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 651 */
7a6f0a1e
CH		 652static void transport_write_pending_qf(struct se_cmd *cmd);
653static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 654
0fd97ccf 655void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 656{
657 struct se_device *dev = container_of(work, struct se_device,
658 qf_work_queue);
bcac364a 659 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 660 struct se_cmd *cmd, *cmd_tmp;
661
662 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 663 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
664 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 665
bcac364a 666 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 667 list_del(&cmd->se_qf_node);
668 atomic_dec(&dev->dev_qf_count);
669 smp_mb__after_atomic_dec();
07bde79a 670
6708bb27 671 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 672 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 673 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 674 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
675 : "UNKNOWN");
f7a5cc0b 676
7a6f0a1e
CH		 677 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
678 transport_write_pending_qf(cmd);
679 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
680 transport_complete_qf(cmd);
07bde79a 681 }
07bde79a
NB		 682}
683
c66ac9db
NB		 684unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
685{
686 switch (cmd->data_direction) {
687 case DMA_NONE:
688 return "NONE";
689 case DMA_FROM_DEVICE:
690 return "READ";
691 case DMA_TO_DEVICE:
692 return "WRITE";
693 case DMA_BIDIRECTIONAL:
694 return "BIDI";
695 default:
696 break;
697 }
698
699 return "UNKNOWN";
700}
701
702void transport_dump_dev_state(
703 struct se_device *dev,
704 char *b,
705 int *bl)
706{
707 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 708 if (dev->export_count)
c66ac9db 709 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 710 else
c66ac9db 711 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 712
5f41a31d 713 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 714 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 715 dev->dev_attrib.block_size,
716 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 717 *bl += sprintf(b + *bl, " ");
718}
719
c66ac9db
NB		 720void transport_dump_vpd_proto_id(
721 struct t10_vpd *vpd,
722 unsigned char *p_buf,
723 int p_buf_len)
724{
725 unsigned char buf[VPD_TMP_BUF_SIZE];
726 int len;
727
728 memset(buf, 0, VPD_TMP_BUF_SIZE);
729 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
730
731 switch (vpd->protocol_identifier) {
732 case 0x00:
733 sprintf(buf+len, "Fibre Channel\n");
734 break;
735 case 0x10:
736 sprintf(buf+len, "Parallel SCSI\n");
737 break;
738 case 0x20:
739 sprintf(buf+len, "SSA\n");
740 break;
741 case 0x30:
742 sprintf(buf+len, "IEEE 1394\n");
743 break;
744 case 0x40:
745 sprintf(buf+len, "SCSI Remote Direct Memory Access"
746 " Protocol\n");
747 break;
748 case 0x50:
749 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
750 break;
751 case 0x60:
752 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
753 break;
754 case 0x70:
755 sprintf(buf+len, "Automation/Drive Interface Transport"
756 " Protocol\n");
757 break;
758 case 0x80:
759 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
760 break;
761 default:
762 sprintf(buf+len, "Unknown 0x%02x\n",
763 vpd->protocol_identifier);
764 break;
765 }
766
767 if (p_buf)
768 strncpy(p_buf, buf, p_buf_len);
769 else
6708bb27 770 pr_debug("%s", buf);
c66ac9db
NB		 771}
772
773void
774transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
775{
776 /*
777 * Check if the Protocol Identifier Valid (PIV) bit is set..
778 *
779 * from spc3r23.pdf section 7.5.1
780 */
781 if (page_83[1] & 0x80) {
782 vpd->protocol_identifier = (page_83[0] & 0xf0);
783 vpd->protocol_identifier_set = 1;
784 transport_dump_vpd_proto_id(vpd, NULL, 0);
785 }
786}
787EXPORT_SYMBOL(transport_set_vpd_proto_id);
788
789int transport_dump_vpd_assoc(
790 struct t10_vpd *vpd,
791 unsigned char *p_buf,
792 int p_buf_len)
793{
794 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 795 int ret = 0;
796 int len;
c66ac9db
NB		 797
798 memset(buf, 0, VPD_TMP_BUF_SIZE);
799 len = sprintf(buf, "T10 VPD Identifier Association: ");
800
801 switch (vpd->association) {
802 case 0x00:
803 sprintf(buf+len, "addressed logical unit\n");
804 break;
805 case 0x10:
806 sprintf(buf+len, "target port\n");
807 break;
808 case 0x20:
809 sprintf(buf+len, "SCSI target device\n");
810 break;
811 default:
812 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 813 ret = -EINVAL;
c66ac9db
NB		 814 break;
815 }
816
817 if (p_buf)
818 strncpy(p_buf, buf, p_buf_len);
819 else
6708bb27 820 pr_debug("%s", buf);
c66ac9db
NB		 821
822 return ret;
823}
824
825int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
826{
827 /*
828 * The VPD identification association..
829 *
830 * from spc3r23.pdf Section 7.6.3.1 Table 297
831 */
832 vpd->association = (page_83[1] & 0x30);
833 return transport_dump_vpd_assoc(vpd, NULL, 0);
834}
835EXPORT_SYMBOL(transport_set_vpd_assoc);
836
837int transport_dump_vpd_ident_type(
838 struct t10_vpd *vpd,
839 unsigned char *p_buf,
840 int p_buf_len)
841{
842 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 843 int ret = 0;
844 int len;
c66ac9db
NB		 845
846 memset(buf, 0, VPD_TMP_BUF_SIZE);
847 len = sprintf(buf, "T10 VPD Identifier Type: ");
848
849 switch (vpd->device_identifier_type) {
850 case 0x00:
851 sprintf(buf+len, "Vendor specific\n");
852 break;
853 case 0x01:
854 sprintf(buf+len, "T10 Vendor ID based\n");
855 break;
856 case 0x02:
857 sprintf(buf+len, "EUI-64 based\n");
858 break;
859 case 0x03:
860 sprintf(buf+len, "NAA\n");
861 break;
862 case 0x04:
863 sprintf(buf+len, "Relative target port identifier\n");
864 break;
865 case 0x08:
866 sprintf(buf+len, "SCSI name string\n");
867 break;
868 default:
869 sprintf(buf+len, "Unsupported: 0x%02x\n",
870 vpd->device_identifier_type);
e3d6f909 871 ret = -EINVAL;
c66ac9db
NB		 872 break;
873 }
874
e3d6f909
AG		 875 if (p_buf) {
876 if (p_buf_len < strlen(buf)+1)
877 return -EINVAL;
c66ac9db 878 strncpy(p_buf, buf, p_buf_len);
e3d6f909 879 } else {
6708bb27 880 pr_debug("%s", buf);
e3d6f909 881 }
c66ac9db
NB		 882
883 return ret;
884}
885
886int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
887{
888 /*
889 * The VPD identifier type..
890 *
891 * from spc3r23.pdf Section 7.6.3.1 Table 298
892 */
893 vpd->device_identifier_type = (page_83[1] & 0x0f);
894 return transport_dump_vpd_ident_type(vpd, NULL, 0);
895}
896EXPORT_SYMBOL(transport_set_vpd_ident_type);
897
898int transport_dump_vpd_ident(
899 struct t10_vpd *vpd,
900 unsigned char *p_buf,
901 int p_buf_len)
902{
903 unsigned char buf[VPD_TMP_BUF_SIZE];
904 int ret = 0;
905
906 memset(buf, 0, VPD_TMP_BUF_SIZE);
907
908 switch (vpd->device_identifier_code_set) {
909 case 0x01: /* Binary */
703d641d
DC		 910 snprintf(buf, sizeof(buf),
911 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 912 &vpd->device_identifier[0]);
913 break;
914 case 0x02: /* ASCII */
703d641d
DC		 915 snprintf(buf, sizeof(buf),
916 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 917 &vpd->device_identifier[0]);
918 break;
919 case 0x03: /* UTF-8 */
703d641d
DC		 920 snprintf(buf, sizeof(buf),
921 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 922 &vpd->device_identifier[0]);
923 break;
924 default:
925 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
926 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 927 ret = -EINVAL;
c66ac9db
NB		 928 break;
929 }
930
931 if (p_buf)
932 strncpy(p_buf, buf, p_buf_len);
933 else
6708bb27 934 pr_debug("%s", buf);
c66ac9db
NB		 935
936 return ret;
937}
938
939int
940transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
941{
942 static const char hex_str[] = "0123456789abcdef";
35d1efe8 943 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 944
945 /*
946 * The VPD Code Set (encoding)
947 *
948 * from spc3r23.pdf Section 7.6.3.1 Table 296
949 */
950 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
951 switch (vpd->device_identifier_code_set) {
952 case 0x01: /* Binary */
953 vpd->device_identifier[j++] =
954 hex_str[vpd->device_identifier_type];
955 while (i < (4 + page_83[3])) {
956 vpd->device_identifier[j++] =
957 hex_str[(page_83[i] & 0xf0) >> 4];
958 vpd->device_identifier[j++] =
959 hex_str[page_83[i] & 0x0f];
960 i++;
961 }
962 break;
963 case 0x02: /* ASCII */
964 case 0x03: /* UTF-8 */
965 while (i < (4 + page_83[3]))
966 vpd->device_identifier[j++] = page_83[i++];
967 break;
968 default:
969 break;
970 }
971
972 return transport_dump_vpd_ident(vpd, NULL, 0);
973}
974EXPORT_SYMBOL(transport_set_vpd_ident);
975
de103c93
CH		 976sense_reason_t
977target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 978{
979 struct se_device *dev = cmd->se_dev;
980
981 if (cmd->unknown_data_length) {
982 cmd->data_length = size;
983 } else if (size != cmd->data_length) {
984 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
985 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
986 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
987 cmd->data_length, size, cmd->t_task_cdb[0]);
988
9b3b8041
CH		 989 if (cmd->data_direction == DMA_TO_DEVICE) {
990 pr_err("Rejecting underflow/overflow"
991 " WRITE data\n");
de103c93 992 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 993 }
994 /*
995 * Reject READ_* or WRITE_* with overflow/underflow for
996 * type SCF_SCSI_DATA_CDB.
997 */
0fd97ccf 998 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 999 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1000 " CDB on non 512-byte sector setup subsystem"
1001 " plugin: %s\n", dev->transport->name);
1002 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1003 return TCM_INVALID_CDB_FIELD;
9b3b8041 1004 }
4c054ba6
NB		 1005 /*
1006 * For the overflow case keep the existing fabric provided
1007 * ->data_length. Otherwise for the underflow case, reset
1008 * ->data_length to the smaller SCSI expected data transfer
1009 * length.
1010 */
9b3b8041
CH		 1011 if (size > cmd->data_length) {
1012 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1013 cmd->residual_count = (size - cmd->data_length);
1014 } else {
1015 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1016 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1017 cmd->data_length = size;
9b3b8041 1018 }
9b3b8041
CH		 1019 }
1020
1021 return 0;
1022
9b3b8041
CH		 1023}
1024
c66ac9db
NB		 1025/*
1026 * Used by fabric modules containing a local struct se_cmd within their
1027 * fabric dependent per I/O descriptor.
1028 */
1029void transport_init_se_cmd(
1030 struct se_cmd *cmd,
1031 struct target_core_fabric_ops *tfo,
1032 struct se_session *se_sess,
1033 u32 data_length,
1034 int data_direction,
1035 int task_attr,
1036 unsigned char *sense_buffer)
1037{
5951146d
AG		 1038 INIT_LIST_HEAD(&cmd->se_lun_node);
1039 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1040 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1041 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1042 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1043 init_completion(&cmd->transport_lun_fe_stop_comp);
1044 init_completion(&cmd->transport_lun_stop_comp);
1045 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1046 init_completion(&cmd->cmd_wait_comp);
cf572a96 1047 init_completion(&cmd->task_stop_comp);
a1d8b49a 1048 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1049 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1050
1051 cmd->se_tfo = tfo;
1052 cmd->se_sess = se_sess;
1053 cmd->data_length = data_length;
1054 cmd->data_direction = data_direction;
1055 cmd->sam_task_attr = task_attr;
1056 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1057
1058 cmd->state_active = false;
c66ac9db
NB		 1059}
1060EXPORT_SYMBOL(transport_init_se_cmd);
1061
de103c93
CH		 1062static sense_reason_t
1063transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1064{
019c4ca6
CH		 1065 struct se_device *dev = cmd->se_dev;
1066
c66ac9db
NB		 1067 /*
1068 * Check if SAM Task Attribute emulation is enabled for this
1069 * struct se_device storage object
1070 */
019c4ca6 1071 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1072 return 0;
1073
e66ecd50 1074 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1075 pr_debug("SAM Task Attribute ACA"
c66ac9db 1076 " emulation is not supported\n");
de103c93 1077 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1078 }
1079 /*
1080 * Used to determine when ORDERED commands should go from
1081 * Dormant to Active status.
1082 */
019c4ca6 1083 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1084 smp_mb__after_atomic_inc();
6708bb27 1085 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1086 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1087 dev->transport->name);
c66ac9db
NB		 1088 return 0;
1089}
1090
de103c93
CH		 1091sense_reason_t
1092target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1093{
0fd97ccf 1094 struct se_device *dev = cmd->se_dev;
cb4f4d3c 1095 unsigned long flags;
de103c93 1096 sense_reason_t ret;
c66ac9db 1097
c66ac9db
NB		 1098 /*
1099 * Ensure that the received CDB is less than the max (252 + 8) bytes
1100 * for VARIABLE_LENGTH_CMD
1101 */
1102 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1103 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1104 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1105 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1106 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1107 }
1108 /*
1109 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1110 * allocate the additional extended CDB buffer now.. Otherwise
1111 * setup the pointer from __t_task_cdb to t_task_cdb.
1112 */
a1d8b49a
AG		 1113 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1114 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1115 GFP_KERNEL);
6708bb27
AG		 1116 if (!cmd->t_task_cdb) {
1117 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1118 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1119 scsi_command_size(cdb),
a1d8b49a 1120 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1121 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1122 }
1123 } else
a1d8b49a 1124 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1125 /*
a1d8b49a 1126 * Copy the original CDB into cmd->
c66ac9db 1127 */
a1d8b49a 1128 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1129
1130 /*
1131 * Check for an existing UNIT ATTENTION condition
1132 */
de103c93
CH		 1133 ret = target_scsi3_ua_check(cmd);
1134 if (ret)
1135 return ret;
cb4f4d3c 1136
c87fbd56 1137 ret = target_alua_state_check(cmd);
de103c93
CH		 1138 if (ret)
1139 return ret;
cb4f4d3c 1140
d977f437 1141 ret = target_check_reservation(cmd);
f85eda8d
NB		 1142 if (ret) {
1143 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1144 return ret;
f85eda8d 1145 }
cb4f4d3c 1146
0fd97ccf 1147 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1148 if (ret)
1149 return ret;
1150
1151 ret = transport_check_alloc_task_attr(cmd);
1152 if (ret)
c66ac9db 1153 return ret;
cb4f4d3c
CH		 1154
1155 spin_lock_irqsave(&cmd->t_state_lock, flags);
1156 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1157 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1158
c66ac9db
NB		 1159 spin_lock(&cmd->se_lun->lun_sep_lock);
1160 if (cmd->se_lun->lun_sep)
1161 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1162 spin_unlock(&cmd->se_lun->lun_sep_lock);
1163 return 0;
1164}
a12f41f8 1165EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1166
695434e1
NB		 1167/*
1168 * Used by fabric module frontends to queue tasks directly.
1169 * Many only be used from process context only
1170 */
1171int transport_handle_cdb_direct(
1172 struct se_cmd *cmd)
1173{
de103c93 1174 sense_reason_t ret;
dd8ae59d 1175
695434e1
NB		 1176 if (!cmd->se_lun) {
1177 dump_stack();
6708bb27 1178 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1179 return -EINVAL;
1180 }
1181 if (in_interrupt()) {
1182 dump_stack();
6708bb27 1183 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1184 " from interrupt context\n");
1185 return -EINVAL;
1186 }
dd8ae59d 1187 /*
af877292
CH		 1188 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1189 * outstanding descriptors are handled correctly during shutdown via
1190 * transport_wait_for_tasks()
dd8ae59d
NB		 1191 *
1192 * Also, we don't take cmd->t_state_lock here as we only expect
1193 * this to be called for initial descriptor submission.
1194 */
1195 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1196 cmd->transport_state |= CMD_T_ACTIVE;
1197
dd8ae59d
NB		 1198 /*
1199 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1200 * so follow TRANSPORT_NEW_CMD processing thread context usage
1201 * and call transport_generic_request_failure() if necessary..
1202 */
1203 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1204 if (ret)
1205 transport_generic_request_failure(cmd, ret);
dd8ae59d 1206 return 0;
695434e1
NB		 1207}
1208EXPORT_SYMBOL(transport_handle_cdb_direct);
1209
de103c93
CH		 1210static sense_reason_t
1211transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1212 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1213{
1214 if (!sgl || !sgl_count)
1215 return 0;
1216
1217 /*
1218 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1219 * scatterlists already have been set to follow what the fabric
1220 * passes for the original expected data transfer length.
1221 */
1222 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1223 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1224 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1225 return TCM_INVALID_CDB_FIELD;
1226 }
1227
1228 cmd->t_data_sg = sgl;
1229 cmd->t_data_nents = sgl_count;
1230
1231 if (sgl_bidi && sgl_bidi_count) {
1232 cmd->t_bidi_data_sg = sgl_bidi;
1233 cmd->t_bidi_data_nents = sgl_bidi_count;
1234 }
1235 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1236 return 0;
1237}
1238
a026757f
NB		 1239/*
1240 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1241 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1242 *
1243 * @se_cmd: command descriptor to submit
1244 * @se_sess: associated se_sess for endpoint
1245 * @cdb: pointer to SCSI CDB
1246 * @sense: pointer to SCSI sense buffer
1247 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1248 * @data_length: fabric expected data transfer length
1249 * @task_addr: SAM task attribute
1250 * @data_dir: DMA data direction
1251 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1252 * @sgl: struct scatterlist memory for unidirectional mapping
1253 * @sgl_count: scatterlist count for unidirectional mapping
1254 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1255 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1256 *
d6dfc868
RD		 1257 * Returns non zero to signal active I/O shutdown failure. All other
1258 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1259 * but still return zero here.
1260 *
a6360785
NB		 1261 * This may only be called from process context, and also currently
1262 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1263 */
1264int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1265 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1266 u32 data_length, int task_attr, int data_dir, int flags,
1267 struct scatterlist *sgl, u32 sgl_count,
1268 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1269{
1270 struct se_portal_group *se_tpg;
de103c93
CH		 1271 sense_reason_t rc;
1272 int ret;
a6360785
NB		 1273
1274 se_tpg = se_sess->se_tpg;
1275 BUG_ON(!se_tpg);
1276 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1277 BUG_ON(in_interrupt());
1278 /*
1279 * Initialize se_cmd for target operation. From this point
1280 * exceptions are handled by sending exception status via
1281 * target_core_fabric_ops->queue_status() callback
1282 */
1283 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1284 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1285 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1286 se_cmd->unknown_data_length = 1;
a6360785
NB		 1287 /*
1288 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1289 * se_sess->sess_cmd_list. A second kref_get here is necessary
1290 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1291 * kref_put() to happen during fabric packet acknowledgement.
1292 */
de103c93
CH		 1293 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1294 if (ret)
1295 return ret;
a6360785
NB		 1296 /*
1297 * Signal bidirectional data payloads to target-core
1298 */
1299 if (flags & TARGET_SCF_BIDI_OP)
1300 se_cmd->se_cmd_flags |= SCF_BIDI;
1301 /*
1302 * Locate se_lun pointer and attach it to struct se_cmd
1303 */
de103c93
CH		 1304 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1305 if (rc) {
1306 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1307 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1308 return 0;
735703ca 1309 }
d6e0175c 1310
a12f41f8 1311 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1312 if (rc != 0) {
de103c93 1313 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1314 return 0;
735703ca 1315 }
a026757f
NB		 1316 /*
1317 * When a non zero sgl_count has been passed perform SGL passthrough
1318 * mapping for pre-allocated fabric memory instead of having target
1319 * core perform an internal SGL allocation..
1320 */
1321 if (sgl_count != 0) {
1322 BUG_ON(!sgl);
1323
944981c7
NB		 1324 /*
1325 * A work-around for tcm_loop as some userspace code via
1326 * scsi-generic do not memset their associated read buffers,
1327 * so go ahead and do that here for type non-data CDBs. Also
1328 * note that this is currently guaranteed to be a single SGL
1329 * for this case by target core in target_setup_cmd_from_cdb()
1330 * -> transport_generic_cmd_sequencer().
1331 */
1332 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1333 se_cmd->data_direction == DMA_FROM_DEVICE) {
1334 unsigned char *buf = NULL;
1335
1336 if (sgl)
1337 buf = kmap(sg_page(sgl)) + sgl->offset;
1338
1339 if (buf) {
1340 memset(buf, 0, sgl->length);
1341 kunmap(sg_page(sgl));
1342 }
1343 }
1344
a026757f
NB		 1345 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1346 sgl_bidi, sgl_bidi_count);
1347 if (rc != 0) {
de103c93 1348 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1349 return 0;
1350 }
1351 }
11e319ed
AG		 1352 /*
1353 * Check if we need to delay processing because of ALUA
1354 * Active/NonOptimized primary access state..
1355 */
1356 core_alua_check_nonop_delay(se_cmd);
1357
a6360785 1358 transport_handle_cdb_direct(se_cmd);
d6dfc868 1359 return 0;
a6360785 1360}
a026757f
NB		 1361EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1362
1363/*
1364 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1365 *
1366 * @se_cmd: command descriptor to submit
1367 * @se_sess: associated se_sess for endpoint
1368 * @cdb: pointer to SCSI CDB
1369 * @sense: pointer to SCSI sense buffer
1370 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1371 * @data_length: fabric expected data transfer length
1372 * @task_addr: SAM task attribute
1373 * @data_dir: DMA data direction
1374 * @flags: flags for command submission from target_sc_flags_tables
1375 *
1376 * Returns non zero to signal active I/O shutdown failure. All other
1377 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1378 * but still return zero here.
1379 *
1380 * This may only be called from process context, and also currently
1381 * assumes internal allocation of fabric payload buffer by target-core.
1382 *
1383 * It also assumes interal target core SGL memory allocation.
1384 */
1385int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1386 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1387 u32 data_length, int task_attr, int data_dir, int flags)
1388{
1389 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1390 unpacked_lun, data_length, task_attr, data_dir,
1391 flags, NULL, 0, NULL, 0);
1392}
a6360785
NB		 1393EXPORT_SYMBOL(target_submit_cmd);
1394
9f0d05c2
NB		 1395static void target_complete_tmr_failure(struct work_struct *work)
1396{
1397 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1398
1399 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1400 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1401
1402 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1403}
1404
ea98d7f9
AG		 1405/**
1406 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1407 * for TMR CDBs
1408 *
1409 * @se_cmd: command descriptor to submit
1410 * @se_sess: associated se_sess for endpoint
1411 * @sense: pointer to SCSI sense buffer
1412 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1413 * @fabric_context: fabric context for TMR req
1414 * @tm_type: Type of TM request
c0974f89
NB		 1415 * @gfp: gfp type for caller
1416 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1417 * @flags: submit cmd flags
ea98d7f9
AG		 1418 *
1419 * Callable from all contexts.
1420 **/
1421
c7042cae 1422int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1423 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1424 void *fabric_tmr_ptr, unsigned char tm_type,
1425 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1426{
1427 struct se_portal_group *se_tpg;
1428 int ret;
1429
1430 se_tpg = se_sess->se_tpg;
1431 BUG_ON(!se_tpg);
1432
1433 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1434 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1435 /*
1436 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1437 * allocation failure.
1438 */
c0974f89 1439 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1440 if (ret < 0)
1441 return -ENOMEM;
ea98d7f9 1442
c0974f89
NB		 1443 if (tm_type == TMR_ABORT_TASK)
1444 se_cmd->se_tmr_req->ref_task_tag = tag;
1445
ea98d7f9 1446 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1447 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1448 if (ret) {
1449 core_tmr_release_req(se_cmd->se_tmr_req);
1450 return ret;
1451 }
ea98d7f9 1452
ea98d7f9
AG		 1453 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1454 if (ret) {
9f0d05c2
NB		 1455 /*
1456 * For callback during failure handling, push this work off
1457 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1458 */
1459 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1460 schedule_work(&se_cmd->work);
c7042cae 1461 return 0;
ea98d7f9
AG		 1462 }
1463 transport_generic_handle_tmr(se_cmd);
c7042cae 1464 return 0;
ea98d7f9
AG		 1465}
1466EXPORT_SYMBOL(target_submit_tmr);
1467
cdbb70bb 1468/*
cf572a96 1469 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1470 * has completed.
1471 */
cf572a96 1472bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1473{
cdbb70bb
CH		 1474 bool was_active = false;
1475
cf572a96
CH		 1476 if (cmd->transport_state & CMD_T_BUSY) {
1477 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1478 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1479
cf572a96
CH		 1480 pr_debug("cmd %p waiting to complete\n", cmd);
1481 wait_for_completion(&cmd->task_stop_comp);
1482 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1483
1484 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1485 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1486 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1487 was_active = true;
1488 }
1489
cdbb70bb
CH		 1490 return was_active;
1491}
1492
c66ac9db
NB		 1493/*
1494 * Handle SAM-esque emulation for generic transport request failures.
1495 */
de103c93
CH		 1496void transport_generic_request_failure(struct se_cmd *cmd,
1497 sense_reason_t sense_reason)
c66ac9db 1498{
07bde79a
NB		 1499 int ret = 0;
1500
6708bb27 1501 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1502 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1503 cmd->t_task_cdb[0]);
de103c93 1504 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1505 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1506 cmd->t_state, sense_reason);
d43d6aea 1507 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1508 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1509 (cmd->transport_state & CMD_T_STOP) != 0,
1510 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1511
c66ac9db
NB		 1512 /*
1513 * For SAM Task Attribute emulation for failed struct se_cmd
1514 */
019c4ca6 1515 transport_complete_task_attr(cmd);
c66ac9db 1516
de103c93 1517 switch (sense_reason) {
03e98c9e
NB		 1518 case TCM_NON_EXISTENT_LUN:
1519 case TCM_UNSUPPORTED_SCSI_OPCODE:
1520 case TCM_INVALID_CDB_FIELD:
1521 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1522 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1523 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1524 case TCM_UNKNOWN_MODE_PAGE:
1525 case TCM_WRITE_PROTECTED:
e2397c70 1526 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1527 case TCM_CHECK_CONDITION_ABORT_CMD:
1528 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1529 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1530 break;
de103c93
CH		 1531 case TCM_OUT_OF_RESOURCES:
1532 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1533 break;
03e98c9e 1534 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1535 /*
1536 * No SENSE Data payload for this case, set SCSI Status
1537 * and queue the response to $FABRIC_MOD.
1538 *
1539 * Uses linux/include/scsi/scsi.h SAM status codes defs
1540 */
1541 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1542 /*
1543 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1544 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1545 * CONFLICT STATUS.
1546 *
1547 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1548 */
e3d6f909 1549 if (cmd->se_sess &&
0fd97ccf 1550 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1551 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1552 cmd->orig_fe_lun, 0x2C,
1553 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1554
07bde79a 1555 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1556 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1557 goto queue_full;
c66ac9db 1558 goto check_stop;
c66ac9db 1559 default:
6708bb27 1560 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1561 cmd->t_task_cdb[0], sense_reason);
1562 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1563 break;
1564 }
f3146437 1565
de103c93 1566 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1567 if (ret == -EAGAIN || ret == -ENOMEM)
1568 goto queue_full;
07bde79a 1569
c66ac9db
NB		 1570check_stop:
1571 transport_lun_remove_cmd(cmd);
6708bb27 1572 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1573 ;
07bde79a
NB		 1574 return;
1575
1576queue_full:
e057f533
CH		 1577 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1578 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1579}
2fbff127 1580EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1581
5f41a31d 1582static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1583{
de103c93 1584 sense_reason_t ret;
5f41a31d
CH		 1585
1586 spin_lock_irq(&cmd->t_state_lock);
1587 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1588 spin_unlock_irq(&cmd->t_state_lock);
1589
de103c93
CH		 1590 if (cmd->execute_cmd) {
1591 ret = cmd->execute_cmd(cmd);
1592 if (ret) {
1593 spin_lock_irq(&cmd->t_state_lock);
1594 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1595 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1596
de103c93
CH		 1597 transport_generic_request_failure(cmd, ret);
1598 }
5f41a31d
CH		 1599 }
1600}
1601
019c4ca6 1602static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1603{
1604 struct se_device *dev = cmd->se_dev;
1605
019c4ca6
CH		 1606 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1607 return false;
5f41a31d 1608
c66ac9db 1609 /*
25985edc 1610 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1611 * to allow the passed struct se_cmd list of tasks to the front of the list.
1612 */
5f41a31d
CH		 1613 switch (cmd->sam_task_attr) {
1614 case MSG_HEAD_TAG:
1615 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1616 "se_ordered_id: %u\n",
1617 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1618 return false;
5f41a31d
CH		 1619 case MSG_ORDERED_TAG:
1620 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1621 smp_mb__after_atomic_inc();
1622
5f41a31d
CH		 1623 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1624 " se_ordered_id: %u\n",
1625 cmd->t_task_cdb[0], cmd->se_ordered_id);
1626
c66ac9db 1627 /*
5f41a31d
CH		 1628 * Execute an ORDERED command if no other older commands
1629 * exist that need to be completed first.
c66ac9db 1630 */
5f41a31d 1631 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1632 return false;
5f41a31d
CH		 1633 break;
1634 default:
c66ac9db
NB		 1635 /*
1636 * For SIMPLE and UNTAGGED Task Attribute commands
1637 */
5f41a31d 1638 atomic_inc(&dev->simple_cmds);
c66ac9db 1639 smp_mb__after_atomic_inc();
5f41a31d 1640 break;
c66ac9db 1641 }
5f41a31d 1642
019c4ca6
CH		 1643 if (atomic_read(&dev->dev_ordered_sync) == 0)
1644 return false;
c66ac9db 1645
019c4ca6
CH		 1646 spin_lock(&dev->delayed_cmd_lock);
1647 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1648 spin_unlock(&dev->delayed_cmd_lock);
1649
1650 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1651 " delayed CMD list, se_ordered_id: %u\n",
1652 cmd->t_task_cdb[0], cmd->sam_task_attr,
1653 cmd->se_ordered_id);
1654 return true;
1655}
1656
1657void target_execute_cmd(struct se_cmd *cmd)
1658{
1659 /*
1660 * If the received CDB has aleady been aborted stop processing it here.
1661 */
5bd665f2
LT		 1662 if (transport_check_aborted_status(cmd, 1)) {
1663 complete(&cmd->transport_lun_stop_comp);
5f41a31d 1664 return;
c66ac9db 1665 }
c66ac9db 1666
c66ac9db 1667 /*
019c4ca6
CH		 1668 * Determine if IOCTL context caller in requesting the stopping of this
1669 * command for LUN shutdown purposes.
c66ac9db 1670 */
019c4ca6
CH		 1671 spin_lock_irq(&cmd->t_state_lock);
1672 if (cmd->transport_state & CMD_T_LUN_STOP) {
1673 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1674 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1675
1676 cmd->transport_state &= ~CMD_T_ACTIVE;
1677 spin_unlock_irq(&cmd->t_state_lock);
1678 complete(&cmd->transport_lun_stop_comp);
1679 return;
1680 }
1681 /*
1682 * Determine if frontend context caller is requesting the stopping of
1683 * this command for frontend exceptions.
1684 */
1685 if (cmd->transport_state & CMD_T_STOP) {
1686 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1687 __func__, __LINE__,
1688 cmd->se_tfo->get_task_tag(cmd));
1689
1690 spin_unlock_irq(&cmd->t_state_lock);
1691 complete(&cmd->t_transport_stop_comp);
1692 return;
1693 }
1694
1695 cmd->t_state = TRANSPORT_PROCESSING;
e627c615 1696 cmd->transport_state |= CMD_T_ACTIVE;
019c4ca6
CH		 1697 spin_unlock_irq(&cmd->t_state_lock);
1698
1699 if (!target_handle_task_attr(cmd))
1700 __target_execute_cmd(cmd);
c66ac9db 1701}
70baf0ab 1702EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1703
5f41a31d
CH		 1704/*
1705 * Process all commands up to the last received ORDERED task attribute which
1706 * requires another blocking boundary
1707 */
1708static void target_restart_delayed_cmds(struct se_device *dev)
1709{
1710 for (;;) {
1711 struct se_cmd *cmd;
1712
1713 spin_lock(&dev->delayed_cmd_lock);
1714 if (list_empty(&dev->delayed_cmd_list)) {
1715 spin_unlock(&dev->delayed_cmd_lock);
1716 break;
1717 }
1718
1719 cmd = list_entry(dev->delayed_cmd_list.next,
1720 struct se_cmd, se_delayed_node);
1721 list_del(&cmd->se_delayed_node);
1722 spin_unlock(&dev->delayed_cmd_lock);
1723
1724 __target_execute_cmd(cmd);
1725
1726 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1727 break;
1728 }
1729}
1730
c66ac9db 1731/*
35e0e757 1732 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1733 * and ordered cmds need to have their tasks added to the execution queue.
1734 */
1735static void transport_complete_task_attr(struct se_cmd *cmd)
1736{
5951146d 1737 struct se_device *dev = cmd->se_dev;
c66ac9db 1738
019c4ca6
CH		 1739 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1740 return;
1741
e66ecd50 1742 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1743 atomic_dec(&dev->simple_cmds);
1744 smp_mb__after_atomic_dec();
1745 dev->dev_cur_ordered_id++;
6708bb27 1746 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1747 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1748 cmd->se_ordered_id);
e66ecd50 1749 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1750 dev->dev_cur_ordered_id++;
6708bb27 1751 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1752 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1753 cmd->se_ordered_id);
e66ecd50 1754 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1755 atomic_dec(&dev->dev_ordered_sync);
1756 smp_mb__after_atomic_dec();
c66ac9db
NB		 1757
1758 dev->dev_cur_ordered_id++;
6708bb27 1759 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1760 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1761 }
c66ac9db 1762
5f41a31d 1763 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1764}
1765
e057f533 1766static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1767{
1768 int ret = 0;
1769
019c4ca6 1770 transport_complete_task_attr(cmd);
e057f533
CH		 1771
1772 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1773 ret = cmd->se_tfo->queue_status(cmd);
1774 if (ret)
1775 goto out;
1776 }
07bde79a
NB		 1777
1778 switch (cmd->data_direction) {
1779 case DMA_FROM_DEVICE:
1780 ret = cmd->se_tfo->queue_data_in(cmd);
1781 break;
1782 case DMA_TO_DEVICE:
ec98f782 1783 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1784 ret = cmd->se_tfo->queue_data_in(cmd);
1785 if (ret < 0)
e057f533 1786 break;
07bde79a
NB		 1787 }
1788 /* Fall through for DMA_TO_DEVICE */
1789 case DMA_NONE:
1790 ret = cmd->se_tfo->queue_status(cmd);
1791 break;
1792 default:
1793 break;
1794 }
1795
e057f533
CH		 1796out:
1797 if (ret < 0) {
1798 transport_handle_queue_full(cmd, cmd->se_dev);
1799 return;
1800 }
1801 transport_lun_remove_cmd(cmd);
1802 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1803}
1804
1805static void transport_handle_queue_full(
1806 struct se_cmd *cmd,
e057f533 1807 struct se_device *dev)
07bde79a
NB		 1808{
1809 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1810 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1811 atomic_inc(&dev->dev_qf_count);
1812 smp_mb__after_atomic_inc();
1813 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1814
1815 schedule_work(&cmd->se_dev->qf_work_queue);
1816}
1817
35e0e757 1818static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1819{
35e0e757 1820 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1821 int ret;
35e0e757 1822
c66ac9db
NB		 1823 /*
1824 * Check if we need to move delayed/dormant tasks from cmds on the
1825 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1826 * Attribute.
1827 */
019c4ca6
CH		 1828 transport_complete_task_attr(cmd);
1829
07bde79a
NB		 1830 /*
1831 * Check to schedule QUEUE_FULL work, or execute an existing
1832 * cmd->transport_qf_callback()
1833 */
1834 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1835 schedule_work(&cmd->se_dev->qf_work_queue);
1836
c66ac9db 1837 /*
d5829eac 1838 * Check if we need to send a sense buffer from
c66ac9db
NB		 1839 * the struct se_cmd in question.
1840 */
1841 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1842 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1843 ret = transport_send_check_condition_and_sense(
1844 cmd, 0, 1);
1845 if (ret == -EAGAIN || ret == -ENOMEM)
1846 goto queue_full;
1847
1848 transport_lun_remove_cmd(cmd);
1849 transport_cmd_check_stop_to_fabric(cmd);
1850 return;
c66ac9db
NB		 1851 }
1852 /*
25985edc 1853 * Check for a callback, used by amongst other things
c66ac9db
NB		 1854 * XDWRITE_READ_10 emulation.
1855 */
1856 if (cmd->transport_complete_callback)
1857 cmd->transport_complete_callback(cmd);
1858
1859 switch (cmd->data_direction) {
1860 case DMA_FROM_DEVICE:
1861 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1862 if (cmd->se_lun->lun_sep) {
1863 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1864 cmd->data_length;
1865 }
1866 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1867
07bde79a 1868 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1869 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1870 goto queue_full;
c66ac9db
NB		 1871 break;
1872 case DMA_TO_DEVICE:
1873 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1874 if (cmd->se_lun->lun_sep) {
1875 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1876 cmd->data_length;
1877 }
1878 spin_unlock(&cmd->se_lun->lun_sep_lock);
1879 /*
1880 * Check if we need to send READ payload for BIDI-COMMAND
1881 */
ec98f782 1882 if (cmd->t_bidi_data_sg) {
c66ac9db 1883 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1884 if (cmd->se_lun->lun_sep) {
1885 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1886 cmd->data_length;
1887 }
1888 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1889 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1890 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1891 goto queue_full;
c66ac9db
NB		 1892 break;
1893 }
1894 /* Fall through for DMA_TO_DEVICE */
1895 case DMA_NONE:
07bde79a 1896 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1897 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1898 goto queue_full;
c66ac9db
NB		 1899 break;
1900 default:
1901 break;
1902 }
1903
1904 transport_lun_remove_cmd(cmd);
1905 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1906 return;
1907
1908queue_full:
6708bb27 1909 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1910 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1911 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1912 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1913}
1914
6708bb27 1915static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1916{
ec98f782 1917 struct scatterlist *sg;
ec98f782 1918 int count;
c66ac9db 1919
6708bb27
AG		 1920 for_each_sg(sgl, sg, nents, count)
1921 __free_page(sg_page(sg));
c66ac9db 1922
6708bb27
AG		 1923 kfree(sgl);
1924}
c66ac9db 1925
6708bb27
AG		 1926static inline void transport_free_pages(struct se_cmd *cmd)
1927{
1928 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1929 return;
1930
1931 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 1932 cmd->t_data_sg = NULL;
1933 cmd->t_data_nents = 0;
c66ac9db 1934
6708bb27 1935 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 1936 cmd->t_bidi_data_sg = NULL;
1937 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 1938}
1939
e26d99ae
CH		 1940/**
1941 * transport_release_cmd - free a command
1942 * @cmd: command to free
1943 *
1944 * This routine unconditionally frees a command, and reference counting
1945 * or list removal must be done in the caller.
1946 */
d5ddad41 1947static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 1948{
1949 BUG_ON(!cmd->se_tfo);
1950
c8e31f26 1951 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 1952 core_tmr_release_req(cmd->se_tmr_req);
1953 if (cmd->t_task_cdb != cmd->__t_task_cdb)
1954 kfree(cmd->t_task_cdb);
1955 /*
7481deb4
NB		 1956 * If this cmd has been setup with target_get_sess_cmd(), drop
1957 * the kref and call ->release_cmd() in kref callback.
e26d99ae 1958 */
d5ddad41
NB		 1959 if (cmd->check_release != 0)
1960 return target_put_sess_cmd(cmd->se_sess, cmd);
1961
e26d99ae 1962 cmd->se_tfo->release_cmd(cmd);
d5ddad41 1963 return 1;
e26d99ae
CH		 1964}
1965
d3df7825
CH		 1966/**
1967 * transport_put_cmd - release a reference to a command
1968 * @cmd: command to release
1969 *
1970 * This routine releases our reference to the command and frees it if possible.
1971 */
d5ddad41 1972static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 1973{
1974 unsigned long flags;
c66ac9db 1975
a1d8b49a 1976 spin_lock_irqsave(&cmd->t_state_lock, flags);
d9ed6947
RD		 1977 if (atomic_read(&cmd->t_fe_count) &&
1978 !atomic_dec_and_test(&cmd->t_fe_count)) {
1979 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
d5ddad41 1980 return 0;
4911e3cc
CH		 1981 }
1982
7d680f3b
CH		 1983 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
1984 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 1985 target_remove_from_state_list(cmd);
c66ac9db 1986 }
a1d8b49a 1987 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 1988
c66ac9db 1989 transport_free_pages(cmd);
d5ddad41 1990 return transport_release_cmd(cmd);
c66ac9db 1991}
c66ac9db 1992
4949314c 1993void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 1994{
ec98f782 1995 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 1996 struct page **pages;
1997 int i;
05d1c7c0
AG		 1998
1999 /*
ec98f782
AG		 2000 * We need to take into account a possible offset here for fabrics like
2001 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2002 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2003 */
4949314c
AG		 2004 if (!cmd->t_data_nents)
2005 return NULL;
3717ef0c
PB		 2006
2007 BUG_ON(!sg);
2008 if (cmd->t_data_nents == 1)
4949314c
AG		 2009 return kmap(sg_page(sg)) + sg->offset;
2010
2011 /* >1 page. use vmap */
2012 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2013 if (!pages)
4949314c
AG		 2014 return NULL;
2015
2016 /* convert sg[] to pages[] */
2017 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2018 pages[i] = sg_page(sg);
2019 }
2020
2021 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2022 kfree(pages);
de103c93 2023 if (!cmd->t_data_vmap)
4949314c
AG		 2024 return NULL;
2025
2026 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2027}
4949314c 2028EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2029
4949314c 2030void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2031{
a1edf9cf 2032 if (!cmd->t_data_nents) {
4949314c 2033 return;
a1edf9cf 2034 } else if (cmd->t_data_nents == 1) {
4949314c 2035 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2036 return;
2037 }
4949314c
AG		 2038
2039 vunmap(cmd->t_data_vmap);
2040 cmd->t_data_vmap = NULL;
05d1c7c0 2041}
4949314c 2042EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2043
c66ac9db 2044static int
05d1c7c0 2045transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2046{
ec98f782
AG		 2047 u32 length = cmd->data_length;
2048 unsigned int nents;
2049 struct page *page;
9db9da33 2050 gfp_t zero_flag;
ec98f782 2051 int i = 0;
c66ac9db 2052
ec98f782
AG		 2053 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2054 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2055 if (!cmd->t_data_sg)
2056 return -ENOMEM;
c66ac9db 2057
ec98f782
AG		 2058 cmd->t_data_nents = nents;
2059 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2060
64f1db38 2061 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2062
ec98f782
AG		 2063 while (length) {
2064 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2065 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2066 if (!page)
2067 goto out;
c66ac9db 2068
ec98f782
AG		 2069 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2070 length -= page_len;
2071 i++;
c66ac9db 2072 }
c66ac9db 2073 return 0;
c66ac9db 2074
ec98f782 2075out:
d0e27c88 2076 while (i > 0) {
ec98f782 2077 i--;
d0e27c88 2078 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2079 }
ec98f782
AG		 2080 kfree(cmd->t_data_sg);
2081 cmd->t_data_sg = NULL;
2082 return -ENOMEM;
c66ac9db
NB		 2083}
2084
da0f7619 2085/*
b16a35b0
AG		 2086 * Allocate any required resources to execute the command. For writes we
2087 * might not have the payload yet, so notify the fabric via a call to
2088 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2089 */
de103c93
CH		 2090sense_reason_t
2091transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2092{
c66ac9db
NB		 2093 int ret = 0;
2094
2095 /*
2096 * Determine is the TCM fabric module has already allocated physical
2097 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2098 * beforehand.
c66ac9db 2099 */
ec98f782
AG		 2100 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2101 cmd->data_length) {
05d1c7c0 2102 ret = transport_generic_get_mem(cmd);
c66ac9db 2103 if (ret < 0)
de103c93 2104 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2105 }
da0f7619 2106
4101f0a8 2107 atomic_inc(&cmd->t_fe_count);
4101f0a8 2108
c66ac9db 2109 /*
c3196f0c
CH		 2110 * If this command is not a write we can execute it right here,
2111 * for write buffers we need to notify the fabric driver first
2112 * and let it call back once the write buffers are ready.
c66ac9db 2113 */
5f41a31d 2114 target_add_to_state_list(cmd);
c3196f0c
CH		 2115 if (cmd->data_direction != DMA_TO_DEVICE) {
2116 target_execute_cmd(cmd);
2117 return 0;
2118 }
2119
2120 spin_lock_irq(&cmd->t_state_lock);
2121 cmd->t_state = TRANSPORT_WRITE_PENDING;
2122 spin_unlock_irq(&cmd->t_state_lock);
2123
2124 transport_cmd_check_stop(cmd, false);
2125
2126 ret = cmd->se_tfo->write_pending(cmd);
2127 if (ret == -EAGAIN || ret == -ENOMEM)
2128 goto queue_full;
2129
de103c93
CH		 2130 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2131 WARN_ON(ret);
2132
b69c1fcf 2133 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2134
c3196f0c
CH		 2135queue_full:
2136 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2137 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2138 transport_handle_queue_full(cmd, cmd->se_dev);
2139 return 0;
c66ac9db 2140}
a1d8b49a 2141EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2142
e057f533 2143static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2144{
f147abb4
NB		 2145 int ret;
2146
2147 ret = cmd->se_tfo->write_pending(cmd);
2148 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2149 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2150 cmd);
2151 transport_handle_queue_full(cmd, cmd->se_dev);
2152 }
07bde79a
NB		 2153}
2154
d5ddad41 2155int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2156{
d5ddad41
NB		 2157 int ret = 0;
2158
d14921d6 2159 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2160 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2161 transport_wait_for_tasks(cmd);
2162
d5ddad41 2163 ret = transport_release_cmd(cmd);
d14921d6
NB		 2164 } else {
2165 if (wait_for_tasks)
2166 transport_wait_for_tasks(cmd);
2167
82f1c8a4 2168 if (cmd->se_lun)
c66ac9db 2169 transport_lun_remove_cmd(cmd);
c66ac9db 2170
d5ddad41 2171 ret = transport_put_cmd(cmd);
c66ac9db 2172 }
d5ddad41 2173 return ret;
c66ac9db
NB		 2174}
2175EXPORT_SYMBOL(transport_generic_free_cmd);
2176
a17f091d
NB		 2177/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2178 * @se_sess: session to reference
2179 * @se_cmd: command descriptor to add
a6360785 2180 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2181 */
20361e69 2182int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2183 bool ack_kref)
a17f091d
NB		 2184{
2185 unsigned long flags;
bc187ea6 2186 int ret = 0;
a17f091d 2187
7481deb4 2188 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2189 /*
2190 * Add a second kref if the fabric caller is expecting to handle
2191 * fabric acknowledgement that requires two target_put_sess_cmd()
2192 * invocations before se_cmd descriptor release.
2193 */
86715569 2194 if (ack_kref == true) {
a6360785 2195 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2196 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2197 }
7481deb4 2198
a17f091d 2199 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2200 if (se_sess->sess_tearing_down) {
2201 ret = -ESHUTDOWN;
2202 goto out;
2203 }
a17f091d
NB		 2204 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2205 se_cmd->check_release = 1;
bc187ea6
RD		 2206
2207out:
a17f091d 2208 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2209 return ret;
a17f091d 2210}
20361e69 2211EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2212
7481deb4 2213static void target_release_cmd_kref(struct kref *kref)
a17f091d 2214{
7481deb4
NB		 2215 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2216 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2217
a17f091d 2218 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2219 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2220 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2221 return;
a17f091d 2222 }
a17f091d 2223 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2224 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2225 complete(&se_cmd->cmd_wait_comp);
7481deb4 2226 return;
a17f091d
NB		 2227 }
2228 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2229 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2230
7481deb4
NB		 2231 se_cmd->se_tfo->release_cmd(se_cmd);
2232}
2233
2234/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2235 * @se_sess: session to reference
2236 * @se_cmd: command descriptor to drop
2237 */
2238int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2239{
ccf5ae83
JE		 2240 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2241 &se_sess->sess_cmd_lock);
a17f091d
NB		 2242}
2243EXPORT_SYMBOL(target_put_sess_cmd);
2244
1c7b13fe
RD		 2245/* target_sess_cmd_list_set_waiting - Flag all commands in
2246 * sess_cmd_list to complete cmd_wait_comp. Set
2247 * sess_tearing_down so no more commands are queued.
2248 * @se_sess: session to flag
a17f091d 2249 */
1c7b13fe 2250void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2251{
2252 struct se_cmd *se_cmd;
2253 unsigned long flags;
2254
a17f091d 2255 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2256 if (se_sess->sess_tearing_down) {
2257 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2258 return;
2259 }
1c7b13fe 2260 se_sess->sess_tearing_down = 1;
9b31a328 2261 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2262
9b31a328 2263 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2264 se_cmd->cmd_wait_set = 1;
2265
2266 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2267}
1c7b13fe 2268EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2269
2270/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2271 * @se_sess: session to wait for active I/O
a17f091d 2272 */
be646c2d 2273void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2274{
2275 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2276 unsigned long flags;
a17f091d
NB		 2277
2278 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2279 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2280 list_del(&se_cmd->se_cmd_list);
2281
2282 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2283 " %d\n", se_cmd, se_cmd->t_state,
2284 se_cmd->se_tfo->get_cmd_state(se_cmd));
2285
be646c2d
JE		 2286 wait_for_completion(&se_cmd->cmd_wait_comp);
2287 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2288 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2289 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2290
2291 se_cmd->se_tfo->release_cmd(se_cmd);
2292 }
9b31a328
NB		 2293
2294 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2295 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2296 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2297
a17f091d
NB		 2298}
2299EXPORT_SYMBOL(target_wait_for_sess_cmds);
2300
c66ac9db
NB		 2301/* transport_lun_wait_for_tasks():
2302 *
2303 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2304 * an struct se_lun to be successfully shutdown.
2305 */
2306static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2307{
2308 unsigned long flags;
cf572a96
CH		 2309 int ret = 0;
2310
c66ac9db
NB		 2311 /*
2312 * If the frontend has already requested this struct se_cmd to
2313 * be stopped, we can safely ignore this struct se_cmd.
2314 */
a1d8b49a 2315 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2316 if (cmd->transport_state & CMD_T_STOP) {
2317 cmd->transport_state &= ~CMD_T_LUN_STOP;
2318
2319 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2320 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2321 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2322 transport_cmd_check_stop(cmd, false);
e3d6f909 2323 return -EPERM;
c66ac9db 2324 }
7d680f3b 2325 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2326 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2327
cf572a96
CH		 2328 // XXX: audit task_flags checks.
2329 spin_lock_irqsave(&cmd->t_state_lock, flags);
2330 if ((cmd->transport_state & CMD_T_BUSY) &&
2331 (cmd->transport_state & CMD_T_SENT)) {
2332 if (!target_stop_cmd(cmd, &flags))
2333 ret++;
cf572a96 2334 }
5f41a31d 2335 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2336
785fdf70
CH		 2337 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2338 " %d\n", cmd, ret);
c66ac9db 2339 if (!ret) {
6708bb27 2340 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2341 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2342 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2343 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2344 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2345 }
c66ac9db
NB		 2346
2347 return 0;
2348}
2349
c66ac9db
NB		 2350static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2351{
2352 struct se_cmd *cmd = NULL;
2353 unsigned long lun_flags, cmd_flags;
2354 /*
2355 * Do exception processing and return CHECK_CONDITION status to the
2356 * Initiator Port.
2357 */
2358 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2359 while (!list_empty(&lun->lun_cmd_list)) {
2360 cmd = list_first_entry(&lun->lun_cmd_list,
2361 struct se_cmd, se_lun_node);
3d26fea0 2362 list_del_init(&cmd->se_lun_node);
5951146d 2363
a1d8b49a 2364 spin_lock(&cmd->t_state_lock);
6708bb27 2365 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2366 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2367 cmd->se_lun->unpacked_lun,
2368 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2369 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2370 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2371
2372 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2373
6708bb27
AG		 2374 if (!cmd->se_lun) {
2375 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2376 cmd->se_tfo->get_task_tag(cmd),
2377 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2378 BUG();
2379 }
2380 /*
2381 * If the Storage engine still owns the iscsi_cmd_t, determine
2382 * and/or stop its context.
2383 */
6708bb27 2384 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2385 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2386 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2387
e3d6f909 2388 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2389 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2390 continue;
2391 }
2392
6708bb27 2393 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2394 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2395 cmd->se_lun->unpacked_lun,
2396 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2397
a1d8b49a 2398 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2399 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2400 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2401 goto check_cond;
2402 }
7d680f3b 2403 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2404 target_remove_from_state_list(cmd);
a1d8b49a 2405 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2406
c66ac9db
NB		 2407 /*
2408 * The Storage engine stopped this struct se_cmd before it was
2409 * send to the fabric frontend for delivery back to the
2410 * Initiator Node. Return this SCSI CDB back with an
2411 * CHECK_CONDITION status.
2412 */
2413check_cond:
2414 transport_send_check_condition_and_sense(cmd,
2415 TCM_NON_EXISTENT_LUN, 0);
2416 /*
2417 * If the fabric frontend is waiting for this iscsi_cmd_t to
2418 * be released, notify the waiting thread now that LU has
2419 * finished accessing it.
2420 */
a1d8b49a 2421 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2422 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2423 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2424 " struct se_cmd: %p ITT: 0x%08x\n",
2425 lun->unpacked_lun,
e3d6f909 2426 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2427
a1d8b49a 2428 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2429 cmd_flags);
f7113a47 2430 transport_cmd_check_stop(cmd, false);
a1d8b49a 2431 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2432 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2433 continue;
2434 }
6708bb27 2435 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2436 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2437
a1d8b49a 2438 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2439 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2440 }
2441 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2442}
2443
2444static int transport_clear_lun_thread(void *p)
2445{
8359cf43 2446 struct se_lun *lun = p;
c66ac9db
NB		 2447
2448 __transport_clear_lun_from_sessions(lun);
2449 complete(&lun->lun_shutdown_comp);
2450
2451 return 0;
2452}
2453
2454int transport_clear_lun_from_sessions(struct se_lun *lun)
2455{
2456 struct task_struct *kt;
2457
5951146d 2458 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2459 "tcm_cl_%u", lun->unpacked_lun);
2460 if (IS_ERR(kt)) {
6708bb27 2461 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2462 return PTR_ERR(kt);
c66ac9db
NB		 2463 }
2464 wait_for_completion(&lun->lun_shutdown_comp);
2465
2466 return 0;
2467}
2468
d14921d6
NB		 2469/**
2470 * transport_wait_for_tasks - wait for completion to occur
2471 * @cmd: command to wait
c66ac9db 2472 *
d14921d6
NB		 2473 * Called from frontend fabric context to wait for storage engine
2474 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2475 */
a17f091d 2476bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2477{
2478 unsigned long flags;
2479
a1d8b49a 2480 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2481 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2482 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2483 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2484 return false;
d14921d6 2485 }
cb4f4d3c 2486
c8e31f26
AG		 2487 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2488 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2490 return false;
d14921d6 2491 }
c66ac9db
NB		 2492 /*
2493 * If we are already stopped due to an external event (ie: LUN shutdown)
2494 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2495 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2496 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2497 * has completed its operation on the struct se_cmd.
2498 */
7d680f3b 2499 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2500 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2501 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2502 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2503 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2504 /*
2505 * There is a special case for WRITES where a FE exception +
2506 * LUN shutdown means ConfigFS context is still sleeping on
2507 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2508 * We go ahead and up transport_lun_stop_comp just to be sure
2509 * here.
2510 */
a1d8b49a
AG		 2511 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2512 complete(&cmd->transport_lun_stop_comp);
2513 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2514 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2515
cf572a96 2516 target_remove_from_state_list(cmd);
c66ac9db
NB		 2517 /*
2518 * At this point, the frontend who was the originator of this
2519 * struct se_cmd, now owns the structure and can be released through
2520 * normal means below.
2521 */
6708bb27 2522 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2523 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2524 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2525 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2526
7d680f3b 2527 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2528 }
7d680f3b 2529
3d28934a 2530 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2531 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2532 return false;
d14921d6 2533 }
c66ac9db 2534
7d680f3b 2535 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2536
6708bb27 2537 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2538 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2539 cmd, cmd->se_tfo->get_task_tag(cmd),
2540 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2541
a1d8b49a 2542 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2543
a1d8b49a 2544 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2545
a1d8b49a 2546 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2547 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2548
35d1efe8 2549 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2550 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2551 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2552
d14921d6 2553 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2554
2555 return true;
c66ac9db 2556}
d14921d6 2557EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2558
2559static int transport_get_sense_codes(
2560 struct se_cmd *cmd,
2561 u8 *asc,
2562 u8 *ascq)
2563{
2564 *asc = cmd->scsi_asc;
2565 *ascq = cmd->scsi_ascq;
2566
2567 return 0;
2568}
2569
de103c93
CH		 2570int
2571transport_send_check_condition_and_sense(struct se_cmd *cmd,
2572 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2573{
2574 unsigned char *buffer = cmd->sense_buffer;
2575 unsigned long flags;
c66ac9db
NB		 2576 u8 asc = 0, ascq = 0;
2577
a1d8b49a 2578 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2579 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2580 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2581 return 0;
2582 }
2583 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2584 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2585
2586 if (!reason && from_transport)
2587 goto after_reason;
2588
2589 if (!from_transport)
2590 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2591
c66ac9db
NB		 2592 /*
2593 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2594 * SENSE KEY values from include/scsi/scsi.h
2595 */
2596 switch (reason) {
ba829137
HR		 2597 case TCM_NO_SENSE:
2598 /* CURRENT ERROR */
2599 buffer[0] = 0x70;
2600 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2601 /* Not Ready */
2602 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2603 /* NO ADDITIONAL SENSE INFORMATION */
2604 buffer[SPC_ASC_KEY_OFFSET] = 0;
2605 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2606 break;
c66ac9db 2607 case TCM_NON_EXISTENT_LUN:
eb39d340 2608 /* CURRENT ERROR */
9c58b7dd
RD		 2609 buffer[0] = 0x70;
2610 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2611 /* ILLEGAL REQUEST */
9c58b7dd 2612 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2613 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2614 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2615 break;
c66ac9db
NB		 2616 case TCM_UNSUPPORTED_SCSI_OPCODE:
2617 case TCM_SECTOR_COUNT_TOO_MANY:
2618 /* CURRENT ERROR */
9c58b7dd
RD		 2619 buffer[0] = 0x70;
2620 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2621 /* ILLEGAL REQUEST */
9c58b7dd 2622 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2623 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2624 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2625 break;
2626 case TCM_UNKNOWN_MODE_PAGE:
2627 /* CURRENT ERROR */
9c58b7dd
RD		 2628 buffer[0] = 0x70;
2629 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2630 /* ILLEGAL REQUEST */
9c58b7dd 2631 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2632 /* INVALID FIELD IN CDB */
9c58b7dd 2633 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2634 break;
2635 case TCM_CHECK_CONDITION_ABORT_CMD:
2636 /* CURRENT ERROR */
9c58b7dd
RD		 2637 buffer[0] = 0x70;
2638 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2639 /* ABORTED COMMAND */
9c58b7dd 2640 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2641 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2642 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2643 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2644 break;
2645 case TCM_INCORRECT_AMOUNT_OF_DATA:
2646 /* CURRENT ERROR */
9c58b7dd
RD		 2647 buffer[0] = 0x70;
2648 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2649 /* ABORTED COMMAND */
9c58b7dd 2650 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2651 /* WRITE ERROR */
9c58b7dd 2652 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2653 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2654 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2655 break;
2656 case TCM_INVALID_CDB_FIELD:
2657 /* CURRENT ERROR */
9c58b7dd
RD		 2658 buffer[0] = 0x70;
2659 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2660 /* ILLEGAL REQUEST */
9c58b7dd 2661 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2662 /* INVALID FIELD IN CDB */
9c58b7dd 2663 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2664 break;
2665 case TCM_INVALID_PARAMETER_LIST:
2666 /* CURRENT ERROR */
9c58b7dd
RD		 2667 buffer[0] = 0x70;
2668 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2669 /* ILLEGAL REQUEST */
9c58b7dd 2670 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2671 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2672 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2673 break;
bb992e72
RD		 2674 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2675 /* CURRENT ERROR */
2676 buffer[0] = 0x70;
2677 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2678 /* ILLEGAL REQUEST */
2679 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2680 /* PARAMETER LIST LENGTH ERROR */
2681 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2682 break;
c66ac9db
NB		 2683 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2684 /* CURRENT ERROR */
9c58b7dd
RD		 2685 buffer[0] = 0x70;
2686 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2687 /* ABORTED COMMAND */
9c58b7dd 2688 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2689 /* WRITE ERROR */
9c58b7dd 2690 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2691 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2692 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2693 break;
2694 case TCM_SERVICE_CRC_ERROR:
2695 /* CURRENT ERROR */
9c58b7dd
RD		 2696 buffer[0] = 0x70;
2697 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2698 /* ABORTED COMMAND */
9c58b7dd 2699 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2700 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2701 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2702 /* N/A */
9c58b7dd 2703 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2704 break;
2705 case TCM_SNACK_REJECTED:
2706 /* CURRENT ERROR */
9c58b7dd
RD		 2707 buffer[0] = 0x70;
2708 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2709 /* ABORTED COMMAND */
9c58b7dd 2710 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2711 /* READ ERROR */
9c58b7dd 2712 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2713 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2714 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2715 break;
2716 case TCM_WRITE_PROTECTED:
2717 /* CURRENT ERROR */
9c58b7dd
RD		 2718 buffer[0] = 0x70;
2719 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2720 /* DATA PROTECT */
9c58b7dd 2721 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2722 /* WRITE PROTECTED */
9c58b7dd 2723 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2724 break;
e2397c70
RD		 2725 case TCM_ADDRESS_OUT_OF_RANGE:
2726 /* CURRENT ERROR */
9c58b7dd
RD		 2727 buffer[0] = 0x70;
2728 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2729 /* ILLEGAL REQUEST */
9c58b7dd 2730 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2731 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2732 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2733 break;
c66ac9db
NB		 2734 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2735 /* CURRENT ERROR */
9c58b7dd
RD		 2736 buffer[0] = 0x70;
2737 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2738 /* UNIT ATTENTION */
9c58b7dd 2739 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2740 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2741 buffer[SPC_ASC_KEY_OFFSET] = asc;
2742 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2743 break;
2744 case TCM_CHECK_CONDITION_NOT_READY:
2745 /* CURRENT ERROR */
9c58b7dd
RD		 2746 buffer[0] = 0x70;
2747 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2748 /* Not Ready */
9c58b7dd 2749 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2750 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2751 buffer[SPC_ASC_KEY_OFFSET] = asc;
2752 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2753 break;
2754 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2755 default:
2756 /* CURRENT ERROR */
9c58b7dd
RD		 2757 buffer[0] = 0x70;
2758 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2759 /*
2760 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2761 * Solaris initiators. Returning NOT READY instead means the
2762 * operations will be retried a finite number of times and we
2763 * can survive intermittent errors.
2764 */
2765 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2766 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2767 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2768 break;
2769 }
2770 /*
2771 * This code uses linux/include/scsi/scsi.h SAM status codes!
2772 */
2773 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2774 /*
2775 * Automatically padded, this value is encoded in the fabric's
2776 * data_length response PDU containing the SCSI defined sense data.
2777 */
9c58b7dd 2778 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2779
2780after_reason:
07bde79a 2781 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2782}
2783EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2784
2785int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2786{
c18bc7d8
RD		 2787 if (!(cmd->transport_state & CMD_T_ABORTED))
2788 return 0;
c66ac9db 2789
c18bc7d8
RD		 2790 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2791 return 1;
8b1e1244 2792
c18bc7d8
RD		 2793 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2794 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2795
c18bc7d8
RD		 2796 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2797 cmd->se_tfo->queue_status(cmd);
2798
2799 return 1;
c66ac9db
NB		 2800}
2801EXPORT_SYMBOL(transport_check_aborted_status);
2802
2803void transport_send_task_abort(struct se_cmd *cmd)
2804{
c252f003
NB		 2805 unsigned long flags;
2806
2807 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2808 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2809 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2810 return;
2811 }
2812 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2813
c66ac9db
NB		 2814 /*
2815 * If there are still expected incoming fabric WRITEs, we wait
2816 * until until they have completed before sending a TASK_ABORTED
2817 * response. This response with TASK_ABORTED status will be
2818 * queued back to fabric module by transport_check_aborted_status().
2819 */
2820 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2821 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2822 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2823 smp_mb__after_atomic_inc();
c66ac9db
NB		 2824 }
2825 }
2826 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2827
72b59d6e
RD		 2828 transport_lun_remove_cmd(cmd);
2829
6708bb27 2830 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2831 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2832 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2833
e3d6f909 2834 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2835}
2836
af877292 2837static void target_tmr_work(struct work_struct *work)
c66ac9db 2838{
af877292 2839 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2840 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2841 struct se_tmr_req *tmr = cmd->se_tmr_req;
2842 int ret;
2843
2844 switch (tmr->function) {
5c6cd613 2845 case TMR_ABORT_TASK:
3d28934a 2846 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2847 break;
5c6cd613
NB		 2848 case TMR_ABORT_TASK_SET:
2849 case TMR_CLEAR_ACA:
2850 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2851 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2852 break;
5c6cd613 2853 case TMR_LUN_RESET:
c66ac9db
NB		 2854 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2855 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2856 TMR_FUNCTION_REJECTED;
2857 break;
5c6cd613 2858 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2859 tmr->response = TMR_FUNCTION_REJECTED;
2860 break;
5c6cd613 2861 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2862 tmr->response = TMR_FUNCTION_REJECTED;
2863 break;
c66ac9db 2864 default:
6708bb27 2865 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2866 tmr->function);
2867 tmr->response = TMR_FUNCTION_REJECTED;
2868 break;
2869 }
2870
2871 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2872 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2873
b7b8bef7 2874 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2875}
2876
af877292
CH		 2877int transport_generic_handle_tmr(
2878 struct se_cmd *cmd)
c66ac9db 2879{
af877292
CH		 2880 INIT_WORK(&cmd->work, target_tmr_work);
2881 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2882 return 0;
2883}
af877292 2884EXPORT_SYMBOL(transport_generic_handle_tmr);
kernel source for telekom puls (alcatel/mediatek)