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target: simplify transport_put_cmd
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
39#include <asm/unaligned.h>
40#include <net/sock.h>
41#include <net/tcp.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_cmnd.h>
e66ecd50 44#include <scsi/scsi_tcq.h>
c66ac9db
NB		 45
46#include <target/target_core_base.h>
47#include <target/target_core_device.h>
48#include <target/target_core_tmr.h>
49#include <target/target_core_tpg.h>
50#include <target/target_core_transport.h>
51#include <target/target_core_fabric_ops.h>
52#include <target/target_core_configfs.h>
53
54#include "target_core_alua.h"
55#include "target_core_hba.h"
56#include "target_core_pr.h"
57#include "target_core_scdb.h"
58#include "target_core_ua.h"
59
e3d6f909 60static int sub_api_initialized;
c66ac9db
NB		 61
62static struct kmem_cache *se_cmd_cache;
63static struct kmem_cache *se_sess_cache;
64struct kmem_cache *se_tmr_req_cache;
65struct kmem_cache *se_ua_cache;
c66ac9db
NB		 66struct kmem_cache *t10_pr_reg_cache;
67struct kmem_cache *t10_alua_lu_gp_cache;
68struct kmem_cache *t10_alua_lu_gp_mem_cache;
69struct kmem_cache *t10_alua_tg_pt_gp_cache;
70struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71
72/* Used for transport_dev_get_map_*() */
73typedef int (*map_func_t)(struct se_task *, u32);
74
75static int transport_generic_write_pending(struct se_cmd *);
5951146d 76static int transport_processing_thread(void *param);
c66ac9db
NB		 77static int __transport_execute_tasks(struct se_device *dev);
78static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a
NB		 79static int transport_complete_qf(struct se_cmd *cmd);
80static void transport_handle_queue_full(struct se_cmd *cmd,
81 struct se_device *dev, int (*qf_callback)(struct se_cmd *));
c66ac9db
NB		 82static void transport_direct_request_timeout(struct se_cmd *cmd);
83static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 84static u32 transport_allocate_tasks(struct se_cmd *cmd,
ec98f782 85 unsigned long long starting_lba,
c66ac9db 86 enum dma_data_direction data_direction,
ec98f782 87 struct scatterlist *sgl, unsigned int nents);
05d1c7c0 88static int transport_generic_get_mem(struct se_cmd *cmd);
c66ac9db 89static int transport_generic_remove(struct se_cmd *cmd,
35462975 90 int session_reinstatement);
d3df7825 91static bool transport_put_cmd(struct se_cmd *cmd);
c66ac9db
NB		 92static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
93 struct se_queue_obj *qobj);
94static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
95static void transport_stop_all_task_timers(struct se_cmd *cmd);
96
e3d6f909 97int init_se_kmem_caches(void)
c66ac9db 98{
c66ac9db
NB		 99 se_cmd_cache = kmem_cache_create("se_cmd_cache",
100 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 101 if (!se_cmd_cache) {
102 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 103 goto out;
104 }
105 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
106 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
107 0, NULL);
6708bb27
AG		 108 if (!se_tmr_req_cache) {
109 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db
NB		 110 " failed\n");
111 goto out;
112 }
113 se_sess_cache = kmem_cache_create("se_sess_cache",
114 sizeof(struct se_session), __alignof__(struct se_session),
115 0, NULL);
6708bb27
AG		 116 if (!se_sess_cache) {
117 pr_err("kmem_cache_create() for struct se_session"
c66ac9db
NB		 118 " failed\n");
119 goto out;
120 }
121 se_ua_cache = kmem_cache_create("se_ua_cache",
122 sizeof(struct se_ua), __alignof__(struct se_ua),
123 0, NULL);
6708bb27
AG		 124 if (!se_ua_cache) {
125 pr_err("kmem_cache_create() for struct se_ua failed\n");
c66ac9db
NB		 126 goto out;
127 }
c66ac9db
NB		 128 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
129 sizeof(struct t10_pr_registration),
130 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 131 if (!t10_pr_reg_cache) {
132 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db
NB		 133 " failed\n");
134 goto out;
135 }
136 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
137 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
138 0, NULL);
6708bb27
AG		 139 if (!t10_alua_lu_gp_cache) {
140 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db
NB		 141 " failed\n");
142 goto out;
143 }
144 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
145 sizeof(struct t10_alua_lu_gp_member),
146 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 147 if (!t10_alua_lu_gp_mem_cache) {
148 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db
NB		 149 "cache failed\n");
150 goto out;
151 }
152 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
153 sizeof(struct t10_alua_tg_pt_gp),
154 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 155 if (!t10_alua_tg_pt_gp_cache) {
156 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 157 "cache failed\n");
158 goto out;
159 }
160 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
161 "t10_alua_tg_pt_gp_mem_cache",
162 sizeof(struct t10_alua_tg_pt_gp_member),
163 __alignof__(struct t10_alua_tg_pt_gp_member),
164 0, NULL);
6708bb27
AG		 165 if (!t10_alua_tg_pt_gp_mem_cache) {
166 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 167 "mem_t failed\n");
168 goto out;
169 }
170
c66ac9db
NB		 171 return 0;
172out:
173 if (se_cmd_cache)
174 kmem_cache_destroy(se_cmd_cache);
175 if (se_tmr_req_cache)
176 kmem_cache_destroy(se_tmr_req_cache);
177 if (se_sess_cache)
178 kmem_cache_destroy(se_sess_cache);
179 if (se_ua_cache)
180 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 181 if (t10_pr_reg_cache)
182 kmem_cache_destroy(t10_pr_reg_cache);
183 if (t10_alua_lu_gp_cache)
184 kmem_cache_destroy(t10_alua_lu_gp_cache);
185 if (t10_alua_lu_gp_mem_cache)
186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
187 if (t10_alua_tg_pt_gp_cache)
188 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
189 if (t10_alua_tg_pt_gp_mem_cache)
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 191 return -ENOMEM;
c66ac9db
NB		 192}
193
e3d6f909 194void release_se_kmem_caches(void)
c66ac9db 195{
c66ac9db
NB		 196 kmem_cache_destroy(se_cmd_cache);
197 kmem_cache_destroy(se_tmr_req_cache);
198 kmem_cache_destroy(se_sess_cache);
199 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 200 kmem_cache_destroy(t10_pr_reg_cache);
201 kmem_cache_destroy(t10_alua_lu_gp_cache);
202 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
203 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 205}
206
e3d6f909
AG		 207/* This code ensures unique mib indexes are handed out. */
208static DEFINE_SPINLOCK(scsi_mib_index_lock);
209static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 210
211/*
212 * Allocate a new row index for the entry type specified
213 */
214u32 scsi_get_new_index(scsi_index_t type)
215{
216 u32 new_index;
217
e3d6f909 218 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 219
e3d6f909
AG		 220 spin_lock(&scsi_mib_index_lock);
221 new_index = ++scsi_mib_index[type];
222 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 223
224 return new_index;
225}
226
c66ac9db
NB		 227void transport_init_queue_obj(struct se_queue_obj *qobj)
228{
229 atomic_set(&qobj->queue_cnt, 0);
230 INIT_LIST_HEAD(&qobj->qobj_list);
231 init_waitqueue_head(&qobj->thread_wq);
232 spin_lock_init(&qobj->cmd_queue_lock);
233}
234EXPORT_SYMBOL(transport_init_queue_obj);
235
236static int transport_subsystem_reqmods(void)
237{
238 int ret;
239
240 ret = request_module("target_core_iblock");
241 if (ret != 0)
6708bb27 242 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 243
244 ret = request_module("target_core_file");
245 if (ret != 0)
6708bb27 246 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 247
248 ret = request_module("target_core_pscsi");
249 if (ret != 0)
6708bb27 250 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 251
252 ret = request_module("target_core_stgt");
253 if (ret != 0)
6708bb27 254 pr_err("Unable to load target_core_stgt\n");
c66ac9db
NB		 255
256 return 0;
257}
258
259int transport_subsystem_check_init(void)
260{
e3d6f909
AG		 261 int ret;
262
263 if (sub_api_initialized)
c66ac9db
NB		 264 return 0;
265 /*
266 * Request the loading of known TCM subsystem plugins..
267 */
e3d6f909
AG		 268 ret = transport_subsystem_reqmods();
269 if (ret < 0)
270 return ret;
c66ac9db 271
e3d6f909 272 sub_api_initialized = 1;
c66ac9db
NB		 273 return 0;
274}
275
276struct se_session *transport_init_session(void)
277{
278 struct se_session *se_sess;
279
280 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 281 if (!se_sess) {
282 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 283 " se_sess_cache\n");
284 return ERR_PTR(-ENOMEM);
285 }
286 INIT_LIST_HEAD(&se_sess->sess_list);
287 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 288
289 return se_sess;
290}
291EXPORT_SYMBOL(transport_init_session);
292
293/*
294 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
295 */
296void __transport_register_session(
297 struct se_portal_group *se_tpg,
298 struct se_node_acl *se_nacl,
299 struct se_session *se_sess,
300 void *fabric_sess_ptr)
301{
302 unsigned char buf[PR_REG_ISID_LEN];
303
304 se_sess->se_tpg = se_tpg;
305 se_sess->fabric_sess_ptr = fabric_sess_ptr;
306 /*
307 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
308 *
309 * Only set for struct se_session's that will actually be moving I/O.
310 * eg: *NOT* discovery sessions.
311 */
312 if (se_nacl) {
313 /*
314 * If the fabric module supports an ISID based TransportID,
315 * save this value in binary from the fabric I_T Nexus now.
316 */
e3d6f909 317 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 318 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 319 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 320 &buf[0], PR_REG_ISID_LEN);
321 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
322 }
323 spin_lock_irq(&se_nacl->nacl_sess_lock);
324 /*
325 * The se_nacl->nacl_sess pointer will be set to the
326 * last active I_T Nexus for each struct se_node_acl.
327 */
328 se_nacl->nacl_sess = se_sess;
329
330 list_add_tail(&se_sess->sess_acl_list,
331 &se_nacl->acl_sess_list);
332 spin_unlock_irq(&se_nacl->nacl_sess_lock);
333 }
334 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
335
6708bb27 336 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 337 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 338}
339EXPORT_SYMBOL(__transport_register_session);
340
341void transport_register_session(
342 struct se_portal_group *se_tpg,
343 struct se_node_acl *se_nacl,
344 struct se_session *se_sess,
345 void *fabric_sess_ptr)
346{
347 spin_lock_bh(&se_tpg->session_lock);
348 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
349 spin_unlock_bh(&se_tpg->session_lock);
350}
351EXPORT_SYMBOL(transport_register_session);
352
353void transport_deregister_session_configfs(struct se_session *se_sess)
354{
355 struct se_node_acl *se_nacl;
23388864 356 unsigned long flags;
c66ac9db
NB		 357 /*
358 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
359 */
360 se_nacl = se_sess->se_node_acl;
6708bb27 361 if (se_nacl) {
23388864 362 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 363 list_del(&se_sess->sess_acl_list);
364 /*
365 * If the session list is empty, then clear the pointer.
366 * Otherwise, set the struct se_session pointer from the tail
367 * element of the per struct se_node_acl active session list.
368 */
369 if (list_empty(&se_nacl->acl_sess_list))
370 se_nacl->nacl_sess = NULL;
371 else {
372 se_nacl->nacl_sess = container_of(
373 se_nacl->acl_sess_list.prev,
374 struct se_session, sess_acl_list);
375 }
23388864 376 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 377 }
378}
379EXPORT_SYMBOL(transport_deregister_session_configfs);
380
381void transport_free_session(struct se_session *se_sess)
382{
383 kmem_cache_free(se_sess_cache, se_sess);
384}
385EXPORT_SYMBOL(transport_free_session);
386
387void transport_deregister_session(struct se_session *se_sess)
388{
389 struct se_portal_group *se_tpg = se_sess->se_tpg;
390 struct se_node_acl *se_nacl;
e63a8e19 391 unsigned long flags;
c66ac9db 392
6708bb27 393 if (!se_tpg) {
c66ac9db
NB		 394 transport_free_session(se_sess);
395 return;
396 }
c66ac9db 397
e63a8e19 398 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 399 list_del(&se_sess->sess_list);
400 se_sess->se_tpg = NULL;
401 se_sess->fabric_sess_ptr = NULL;
e63a8e19 402 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 403
404 /*
405 * Determine if we need to do extra work for this initiator node's
406 * struct se_node_acl if it had been previously dynamically generated.
407 */
408 se_nacl = se_sess->se_node_acl;
6708bb27 409 if (se_nacl) {
e63a8e19 410 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 411 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 412 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
413 se_tpg)) {
c66ac9db
NB		 414 list_del(&se_nacl->acl_list);
415 se_tpg->num_node_acls--;
e63a8e19 416 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 417
418 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 419 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 420 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 421 se_nacl);
e63a8e19 422 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 423 }
424 }
e63a8e19 425 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 426 }
427
428 transport_free_session(se_sess);
429
6708bb27 430 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 431 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 432}
433EXPORT_SYMBOL(transport_deregister_session);
434
435/*
a1d8b49a 436 * Called with cmd->t_state_lock held.
c66ac9db
NB		 437 */
438static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
439{
440 struct se_device *dev;
441 struct se_task *task;
442 unsigned long flags;
443
a1d8b49a 444 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 445 dev = task->se_dev;
6708bb27 446 if (!dev)
c66ac9db
NB		 447 continue;
448
449 if (atomic_read(&task->task_active))
450 continue;
451
6708bb27 452 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 453 continue;
454
455 spin_lock_irqsave(&dev->execute_task_lock, flags);
456 list_del(&task->t_state_list);
6708bb27
AG		 457 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
458 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 459 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
460
461 atomic_set(&task->task_state_active, 0);
a1d8b49a 462 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 463 }
464}
465
466/* transport_cmd_check_stop():
467 *
468 * 'transport_off = 1' determines if t_transport_active should be cleared.
469 * 'transport_off = 2' determines if task_dev_state should be removed.
470 *
471 * A non-zero u8 t_state sets cmd->t_state.
472 * Returns 1 when command is stopped, else 0.
473 */
474static int transport_cmd_check_stop(
475 struct se_cmd *cmd,
476 int transport_off,
477 u8 t_state)
478{
479 unsigned long flags;
480
a1d8b49a 481 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 482 /*
483 * Determine if IOCTL context caller in requesting the stopping of this
484 * command for LUN shutdown purposes.
485 */
a1d8b49a 486 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 487 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 488 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 489 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 490
491 cmd->deferred_t_state = cmd->t_state;
492 cmd->t_state = TRANSPORT_DEFERRED_CMD;
a1d8b49a 493 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 494 if (transport_off == 2)
495 transport_all_task_dev_remove_state(cmd);
a1d8b49a 496 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 497
a1d8b49a 498 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 499 return 1;
500 }
501 /*
502 * Determine if frontend context caller is requesting the stopping of
e3d6f909 503 * this command for frontend exceptions.
c66ac9db 504 */
a1d8b49a 505 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 506 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 507 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 508 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 509
510 cmd->deferred_t_state = cmd->t_state;
511 cmd->t_state = TRANSPORT_DEFERRED_CMD;
512 if (transport_off == 2)
513 transport_all_task_dev_remove_state(cmd);
514
515 /*
516 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
517 * to FE.
518 */
519 if (transport_off == 2)
520 cmd->se_lun = NULL;
a1d8b49a 521 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 522
a1d8b49a 523 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 524 return 1;
525 }
526 if (transport_off) {
a1d8b49a 527 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 528 if (transport_off == 2) {
529 transport_all_task_dev_remove_state(cmd);
530 /*
531 * Clear struct se_cmd->se_lun before the transport_off == 2
532 * handoff to fabric module.
533 */
534 cmd->se_lun = NULL;
535 /*
536 * Some fabric modules like tcm_loop can release
25985edc 537 * their internally allocated I/O reference now and
c66ac9db
NB		 538 * struct se_cmd now.
539 */
e3d6f909 540 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 541 spin_unlock_irqrestore(
a1d8b49a 542 &cmd->t_state_lock, flags);
c66ac9db 543
e3d6f909 544 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 545 return 1;
546 }
547 }
a1d8b49a 548 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 549
550 return 0;
551 } else if (t_state)
552 cmd->t_state = t_state;
a1d8b49a 553 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 554
555 return 0;
556}
557
558static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
559{
560 return transport_cmd_check_stop(cmd, 2, 0);
561}
562
563static void transport_lun_remove_cmd(struct se_cmd *cmd)
564{
e3d6f909 565 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 566 unsigned long flags;
567
568 if (!lun)
569 return;
570
a1d8b49a 571 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 572 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 573 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 574 goto check_lun;
575 }
a1d8b49a 576 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 577 transport_all_task_dev_remove_state(cmd);
a1d8b49a 578 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 579
c66ac9db
NB		 580
581check_lun:
582 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 583 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 584 list_del(&cmd->se_lun_node);
a1d8b49a 585 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 586#if 0
6708bb27 587 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 588 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 589#endif
590 }
591 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
592}
593
594void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
595{
c66ac9db
NB		 596 transport_lun_remove_cmd(cmd);
597
598 if (transport_cmd_check_stop_to_fabric(cmd))
599 return;
77039d1e
NB		 600 if (remove) {
601 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
35462975 602 transport_generic_remove(cmd, 0);
77039d1e 603 }
c66ac9db
NB		 604}
605
606void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
607{
5951146d 608 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 609
610 if (transport_cmd_check_stop_to_fabric(cmd))
611 return;
612
35462975 613 transport_generic_remove(cmd, 0);
c66ac9db
NB		 614}
615
5951146d 616static void transport_add_cmd_to_queue(
c66ac9db
NB		 617 struct se_cmd *cmd,
618 int t_state)
619{
620 struct se_device *dev = cmd->se_dev;
e3d6f909 621 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 622 unsigned long flags;
623
c66ac9db 624 if (t_state) {
a1d8b49a 625 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 626 cmd->t_state = t_state;
a1d8b49a
AG		 627 atomic_set(&cmd->t_transport_active, 1);
628 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 629 }
630
631 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 632
633 /* If the cmd is already on the list, remove it before we add it */
634 if (!list_empty(&cmd->se_queue_node))
635 list_del(&cmd->se_queue_node);
636 else
637 atomic_inc(&qobj->queue_cnt);
638
07bde79a
NB		 639 if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
640 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
641 list_add(&cmd->se_queue_node, &qobj->qobj_list);
642 } else
643 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 644 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 645 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646
c66ac9db 647 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 648}
649
5951146d
AG		 650static struct se_cmd *
651transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 652{
5951146d 653 struct se_cmd *cmd;
c66ac9db
NB		 654 unsigned long flags;
655
656 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
657 if (list_empty(&qobj->qobj_list)) {
658 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
659 return NULL;
660 }
5951146d 661 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 662
79a7fef2 663 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 664
79a7fef2 665 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 666 atomic_dec(&qobj->queue_cnt);
667 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
668
5951146d 669 return cmd;
c66ac9db
NB		 670}
671
672static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
673 struct se_queue_obj *qobj)
674{
c66ac9db
NB		 675 unsigned long flags;
676
677 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 678 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 679 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
680 return;
681 }
79a7fef2
RD		 682 atomic_set(&cmd->t_transport_queue_active, 0);
683 atomic_dec(&qobj->queue_cnt);
684 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 685 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
686
a1d8b49a 687 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 688 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 689 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 690 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 691 }
692}
693
694/*
695 * Completion function used by TCM subsystem plugins (such as FILEIO)
696 * for queueing up response from struct se_subsystem_api->do_task()
697 */
698void transport_complete_sync_cache(struct se_cmd *cmd, int good)
699{
a1d8b49a 700 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 701 struct se_task, t_list);
702
703 if (good) {
704 cmd->scsi_status = SAM_STAT_GOOD;
705 task->task_scsi_status = GOOD;
706 } else {
707 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
708 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 709 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 710 PYX_TRANSPORT_ILLEGAL_REQUEST;
711 }
712
713 transport_complete_task(task, good);
714}
715EXPORT_SYMBOL(transport_complete_sync_cache);
716
717/* transport_complete_task():
718 *
719 * Called from interrupt and non interrupt context depending
720 * on the transport plugin.
721 */
722void transport_complete_task(struct se_task *task, int success)
723{
e3d6f909 724 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 725 struct se_device *dev = task->se_dev;
726 int t_state;
727 unsigned long flags;
728#if 0
6708bb27 729 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 730 cmd->t_task_cdb[0], dev);
c66ac9db 731#endif
e3d6f909 732 if (dev)
c66ac9db 733 atomic_inc(&dev->depth_left);
c66ac9db 734
a1d8b49a 735 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 736 atomic_set(&task->task_active, 0);
737
738 /*
739 * See if any sense data exists, if so set the TASK_SENSE flag.
740 * Also check for any other post completion work that needs to be
741 * done by the plugins.
742 */
743 if (dev && dev->transport->transport_complete) {
744 if (dev->transport->transport_complete(task) != 0) {
745 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
746 task->task_sense = 1;
747 success = 1;
748 }
749 }
750
751 /*
752 * See if we are waiting for outstanding struct se_task
753 * to complete for an exception condition
754 */
755 if (atomic_read(&task->task_stop)) {
756 /*
a1d8b49a 757 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 758 * previously thrown its timeout exception handler.
759 */
760 if (atomic_read(&task->task_timeout)) {
a1d8b49a 761 atomic_dec(&cmd->t_se_count);
c66ac9db
NB		 762 atomic_set(&task->task_timeout, 0);
763 }
a1d8b49a 764 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 765
766 complete(&task->task_stop_comp);
767 return;
768 }
769 /*
770 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
771 * left counter to determine when the struct se_cmd is ready to be queued to
772 * the processing thread.
773 */
774 if (atomic_read(&task->task_timeout)) {
6708bb27
AG		 775 if (!atomic_dec_and_test(
776 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 777 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 778 flags);
779 return;
780 }
781 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 782 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 783
784 transport_add_cmd_to_queue(cmd, t_state);
785 return;
786 }
a1d8b49a 787 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 788
789 /*
790 * Decrement the outstanding t_task_cdbs_left count. The last
791 * struct se_task from struct se_cmd will complete itself into the
792 * device queue depending upon int success.
793 */
6708bb27 794 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 795 if (!success)
a1d8b49a 796 cmd->t_tasks_failed = 1;
c66ac9db 797
a1d8b49a 798 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 799 return;
800 }
801
a1d8b49a 802 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 803 t_state = TRANSPORT_COMPLETE_FAILURE;
804 if (!task->task_error_status) {
805 task->task_error_status =
806 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
807 cmd->transport_error_status =
808 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
809 }
810 } else {
a1d8b49a 811 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 812 t_state = TRANSPORT_COMPLETE_OK;
813 }
a1d8b49a 814 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 815
816 transport_add_cmd_to_queue(cmd, t_state);
817}
818EXPORT_SYMBOL(transport_complete_task);
819
820/*
821 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
822 * struct se_task list are ready to be added to the active execution list
823 * struct se_device
824
825 * Called with se_dev_t->execute_task_lock called.
826 */
827static inline int transport_add_task_check_sam_attr(
828 struct se_task *task,
829 struct se_task *task_prev,
830 struct se_device *dev)
831{
832 /*
833 * No SAM Task attribute emulation enabled, add to tail of
834 * execution queue
835 */
836 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
837 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
838 return 0;
839 }
840 /*
841 * HEAD_OF_QUEUE attribute for received CDB, which means
842 * the first task that is associated with a struct se_cmd goes to
843 * head of the struct se_device->execute_task_list, and task_prev
844 * after that for each subsequent task
845 */
e66ecd50 846 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 847 list_add(&task->t_execute_list,
848 (task_prev != NULL) ?
849 &task_prev->t_execute_list :
850 &dev->execute_task_list);
851
6708bb27 852 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 853 " in execution queue\n",
6708bb27 854 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 855 return 1;
856 }
857 /*
858 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
859 * transitioned from Dermant -> Active state, and are added to the end
860 * of the struct se_device->execute_task_list
861 */
862 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
863 return 0;
864}
865
866/* __transport_add_task_to_execute_queue():
867 *
868 * Called with se_dev_t->execute_task_lock called.
869 */
870static void __transport_add_task_to_execute_queue(
871 struct se_task *task,
872 struct se_task *task_prev,
873 struct se_device *dev)
874{
875 int head_of_queue;
876
877 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
878 atomic_inc(&dev->execute_tasks);
879
880 if (atomic_read(&task->task_state_active))
881 return;
882 /*
883 * Determine if this task needs to go to HEAD_OF_QUEUE for the
884 * state list as well. Running with SAM Task Attribute emulation
885 * will always return head_of_queue == 0 here
886 */
887 if (head_of_queue)
888 list_add(&task->t_state_list, (task_prev) ?
889 &task_prev->t_state_list :
890 &dev->state_task_list);
891 else
892 list_add_tail(&task->t_state_list, &dev->state_task_list);
893
894 atomic_set(&task->task_state_active, 1);
895
6708bb27 896 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 897 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 898 task, dev);
899}
900
901static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
902{
903 struct se_device *dev;
904 struct se_task *task;
905 unsigned long flags;
906
a1d8b49a
AG		 907 spin_lock_irqsave(&cmd->t_state_lock, flags);
908 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 909 dev = task->se_dev;
910
911 if (atomic_read(&task->task_state_active))
912 continue;
913
914 spin_lock(&dev->execute_task_lock);
915 list_add_tail(&task->t_state_list, &dev->state_task_list);
916 atomic_set(&task->task_state_active, 1);
917
6708bb27
AG		 918 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
919 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 920 task->task_se_cmd), task, dev);
921
922 spin_unlock(&dev->execute_task_lock);
923 }
a1d8b49a 924 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 925}
926
927static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
928{
5951146d 929 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 930 struct se_task *task, *task_prev = NULL;
931 unsigned long flags;
932
933 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 934 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 935 if (atomic_read(&task->task_execute_queue))
936 continue;
937 /*
938 * __transport_add_task_to_execute_queue() handles the
939 * SAM Task Attribute emulation if enabled
940 */
941 __transport_add_task_to_execute_queue(task, task_prev, dev);
942 atomic_set(&task->task_execute_queue, 1);
943 task_prev = task;
944 }
945 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 946}
947
948/* transport_remove_task_from_execute_queue():
949 *
950 *
951 */
52208ae3 952void transport_remove_task_from_execute_queue(
c66ac9db
NB		 953 struct se_task *task,
954 struct se_device *dev)
955{
956 unsigned long flags;
957
af57c3ac
NB		 958 if (atomic_read(&task->task_execute_queue) == 0) {
959 dump_stack();
960 return;
961 }
962
c66ac9db
NB		 963 spin_lock_irqsave(&dev->execute_task_lock, flags);
964 list_del(&task->t_execute_list);
af57c3ac 965 atomic_set(&task->task_execute_queue, 0);
c66ac9db
NB		 966 atomic_dec(&dev->execute_tasks);
967 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
968}
969
07bde79a
NB		 970/*
971 * Handle QUEUE_FULL / -EAGAIN status
972 */
973
974static void target_qf_do_work(struct work_struct *work)
975{
976 struct se_device *dev = container_of(work, struct se_device,
977 qf_work_queue);
bcac364a 978 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 979 struct se_cmd *cmd, *cmd_tmp;
980
981 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 982 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
983 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 984
bcac364a 985 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 986 list_del(&cmd->se_qf_node);
987 atomic_dec(&dev->dev_qf_count);
988 smp_mb__after_atomic_dec();
07bde79a 989
6708bb27 990 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a
NB		 991 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
992 (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
993 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
994 : "UNKNOWN");
995 /*
996 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
997 * has been added to head of queue
998 */
999 transport_add_cmd_to_queue(cmd, cmd->t_state);
07bde79a 1000 }
07bde79a
NB		 1001}
1002
c66ac9db
NB		 1003unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1004{
1005 switch (cmd->data_direction) {
1006 case DMA_NONE:
1007 return "NONE";
1008 case DMA_FROM_DEVICE:
1009 return "READ";
1010 case DMA_TO_DEVICE:
1011 return "WRITE";
1012 case DMA_BIDIRECTIONAL:
1013 return "BIDI";
1014 default:
1015 break;
1016 }
1017
1018 return "UNKNOWN";
1019}
1020
1021void transport_dump_dev_state(
1022 struct se_device *dev,
1023 char *b,
1024 int *bl)
1025{
1026 *bl += sprintf(b + *bl, "Status: ");
1027 switch (dev->dev_status) {
1028 case TRANSPORT_DEVICE_ACTIVATED:
1029 *bl += sprintf(b + *bl, "ACTIVATED");
1030 break;
1031 case TRANSPORT_DEVICE_DEACTIVATED:
1032 *bl += sprintf(b + *bl, "DEACTIVATED");
1033 break;
1034 case TRANSPORT_DEVICE_SHUTDOWN:
1035 *bl += sprintf(b + *bl, "SHUTDOWN");
1036 break;
1037 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1038 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1039 *bl += sprintf(b + *bl, "OFFLINE");
1040 break;
1041 default:
1042 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1043 break;
1044 }
1045
1046 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1047 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1048 dev->queue_depth);
1049 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1050 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1051 *bl += sprintf(b + *bl, " ");
1052}
1053
1054/* transport_release_all_cmds():
1055 *
1056 *
1057 */
1058static void transport_release_all_cmds(struct se_device *dev)
1059{
5951146d 1060 struct se_cmd *cmd, *tcmd;
c66ac9db
NB		 1061 int bug_out = 0, t_state;
1062 unsigned long flags;
1063
e3d6f909 1064 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
5951146d
AG		 1065 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1066 se_queue_node) {
1067 t_state = cmd->t_state;
79a7fef2 1068 list_del_init(&cmd->se_queue_node);
e3d6f909 1069 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
c66ac9db
NB		 1070 flags);
1071
6708bb27 1072 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
c66ac9db 1073 " t_state: %u directly\n",
e3d6f909
AG		 1074 cmd->se_tfo->get_task_tag(cmd),
1075 cmd->se_tfo->get_cmd_state(cmd), t_state);
c66ac9db 1076
d3df7825 1077 transport_put_cmd(cmd);
c66ac9db
NB		 1078 bug_out = 1;
1079
e3d6f909 1080 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db 1081 }
e3d6f909 1082 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db
NB		 1083#if 0
1084 if (bug_out)
1085 BUG();
1086#endif
1087}
1088
1089void transport_dump_vpd_proto_id(
1090 struct t10_vpd *vpd,
1091 unsigned char *p_buf,
1092 int p_buf_len)
1093{
1094 unsigned char buf[VPD_TMP_BUF_SIZE];
1095 int len;
1096
1097 memset(buf, 0, VPD_TMP_BUF_SIZE);
1098 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1099
1100 switch (vpd->protocol_identifier) {
1101 case 0x00:
1102 sprintf(buf+len, "Fibre Channel\n");
1103 break;
1104 case 0x10:
1105 sprintf(buf+len, "Parallel SCSI\n");
1106 break;
1107 case 0x20:
1108 sprintf(buf+len, "SSA\n");
1109 break;
1110 case 0x30:
1111 sprintf(buf+len, "IEEE 1394\n");
1112 break;
1113 case 0x40:
1114 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1115 " Protocol\n");
1116 break;
1117 case 0x50:
1118 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1119 break;
1120 case 0x60:
1121 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1122 break;
1123 case 0x70:
1124 sprintf(buf+len, "Automation/Drive Interface Transport"
1125 " Protocol\n");
1126 break;
1127 case 0x80:
1128 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1129 break;
1130 default:
1131 sprintf(buf+len, "Unknown 0x%02x\n",
1132 vpd->protocol_identifier);
1133 break;
1134 }
1135
1136 if (p_buf)
1137 strncpy(p_buf, buf, p_buf_len);
1138 else
6708bb27 1139 pr_debug("%s", buf);
c66ac9db
NB		 1140}
1141
1142void
1143transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1144{
1145 /*
1146 * Check if the Protocol Identifier Valid (PIV) bit is set..
1147 *
1148 * from spc3r23.pdf section 7.5.1
1149 */
1150 if (page_83[1] & 0x80) {
1151 vpd->protocol_identifier = (page_83[0] & 0xf0);
1152 vpd->protocol_identifier_set = 1;
1153 transport_dump_vpd_proto_id(vpd, NULL, 0);
1154 }
1155}
1156EXPORT_SYMBOL(transport_set_vpd_proto_id);
1157
1158int transport_dump_vpd_assoc(
1159 struct t10_vpd *vpd,
1160 unsigned char *p_buf,
1161 int p_buf_len)
1162{
1163 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1164 int ret = 0;
1165 int len;
c66ac9db
NB		 1166
1167 memset(buf, 0, VPD_TMP_BUF_SIZE);
1168 len = sprintf(buf, "T10 VPD Identifier Association: ");
1169
1170 switch (vpd->association) {
1171 case 0x00:
1172 sprintf(buf+len, "addressed logical unit\n");
1173 break;
1174 case 0x10:
1175 sprintf(buf+len, "target port\n");
1176 break;
1177 case 0x20:
1178 sprintf(buf+len, "SCSI target device\n");
1179 break;
1180 default:
1181 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1182 ret = -EINVAL;
c66ac9db
NB		 1183 break;
1184 }
1185
1186 if (p_buf)
1187 strncpy(p_buf, buf, p_buf_len);
1188 else
6708bb27 1189 pr_debug("%s", buf);
c66ac9db
NB		 1190
1191 return ret;
1192}
1193
1194int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1195{
1196 /*
1197 * The VPD identification association..
1198 *
1199 * from spc3r23.pdf Section 7.6.3.1 Table 297
1200 */
1201 vpd->association = (page_83[1] & 0x30);
1202 return transport_dump_vpd_assoc(vpd, NULL, 0);
1203}
1204EXPORT_SYMBOL(transport_set_vpd_assoc);
1205
1206int transport_dump_vpd_ident_type(
1207 struct t10_vpd *vpd,
1208 unsigned char *p_buf,
1209 int p_buf_len)
1210{
1211 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1212 int ret = 0;
1213 int len;
c66ac9db
NB		 1214
1215 memset(buf, 0, VPD_TMP_BUF_SIZE);
1216 len = sprintf(buf, "T10 VPD Identifier Type: ");
1217
1218 switch (vpd->device_identifier_type) {
1219 case 0x00:
1220 sprintf(buf+len, "Vendor specific\n");
1221 break;
1222 case 0x01:
1223 sprintf(buf+len, "T10 Vendor ID based\n");
1224 break;
1225 case 0x02:
1226 sprintf(buf+len, "EUI-64 based\n");
1227 break;
1228 case 0x03:
1229 sprintf(buf+len, "NAA\n");
1230 break;
1231 case 0x04:
1232 sprintf(buf+len, "Relative target port identifier\n");
1233 break;
1234 case 0x08:
1235 sprintf(buf+len, "SCSI name string\n");
1236 break;
1237 default:
1238 sprintf(buf+len, "Unsupported: 0x%02x\n",
1239 vpd->device_identifier_type);
e3d6f909 1240 ret = -EINVAL;
c66ac9db
NB		 1241 break;
1242 }
1243
e3d6f909
AG		 1244 if (p_buf) {
1245 if (p_buf_len < strlen(buf)+1)
1246 return -EINVAL;
c66ac9db 1247 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1248 } else {
6708bb27 1249 pr_debug("%s", buf);
e3d6f909 1250 }
c66ac9db
NB		 1251
1252 return ret;
1253}
1254
1255int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1256{
1257 /*
1258 * The VPD identifier type..
1259 *
1260 * from spc3r23.pdf Section 7.6.3.1 Table 298
1261 */
1262 vpd->device_identifier_type = (page_83[1] & 0x0f);
1263 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1264}
1265EXPORT_SYMBOL(transport_set_vpd_ident_type);
1266
1267int transport_dump_vpd_ident(
1268 struct t10_vpd *vpd,
1269 unsigned char *p_buf,
1270 int p_buf_len)
1271{
1272 unsigned char buf[VPD_TMP_BUF_SIZE];
1273 int ret = 0;
1274
1275 memset(buf, 0, VPD_TMP_BUF_SIZE);
1276
1277 switch (vpd->device_identifier_code_set) {
1278 case 0x01: /* Binary */
1279 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1280 &vpd->device_identifier[0]);
1281 break;
1282 case 0x02: /* ASCII */
1283 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1284 &vpd->device_identifier[0]);
1285 break;
1286 case 0x03: /* UTF-8 */
1287 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1288 &vpd->device_identifier[0]);
1289 break;
1290 default:
1291 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1292 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1293 ret = -EINVAL;
c66ac9db
NB		 1294 break;
1295 }
1296
1297 if (p_buf)
1298 strncpy(p_buf, buf, p_buf_len);
1299 else
6708bb27 1300 pr_debug("%s", buf);
c66ac9db
NB		 1301
1302 return ret;
1303}
1304
1305int
1306transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1307{
1308 static const char hex_str[] = "0123456789abcdef";
1309 int j = 0, i = 4; /* offset to start of the identifer */
1310
1311 /*
1312 * The VPD Code Set (encoding)
1313 *
1314 * from spc3r23.pdf Section 7.6.3.1 Table 296
1315 */
1316 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1317 switch (vpd->device_identifier_code_set) {
1318 case 0x01: /* Binary */
1319 vpd->device_identifier[j++] =
1320 hex_str[vpd->device_identifier_type];
1321 while (i < (4 + page_83[3])) {
1322 vpd->device_identifier[j++] =
1323 hex_str[(page_83[i] & 0xf0) >> 4];
1324 vpd->device_identifier[j++] =
1325 hex_str[page_83[i] & 0x0f];
1326 i++;
1327 }
1328 break;
1329 case 0x02: /* ASCII */
1330 case 0x03: /* UTF-8 */
1331 while (i < (4 + page_83[3]))
1332 vpd->device_identifier[j++] = page_83[i++];
1333 break;
1334 default:
1335 break;
1336 }
1337
1338 return transport_dump_vpd_ident(vpd, NULL, 0);
1339}
1340EXPORT_SYMBOL(transport_set_vpd_ident);
1341
1342static void core_setup_task_attr_emulation(struct se_device *dev)
1343{
1344 /*
1345 * If this device is from Target_Core_Mod/pSCSI, disable the
1346 * SAM Task Attribute emulation.
1347 *
1348 * This is currently not available in upsream Linux/SCSI Target
1349 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1350 */
e3d6f909 1351 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1352 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1353 return;
1354 }
1355
1356 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1357 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1358 " device\n", dev->transport->name,
1359 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1360}
1361
1362static void scsi_dump_inquiry(struct se_device *dev)
1363{
e3d6f909 1364 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1365 int i, device_type;
1366 /*
1367 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1368 */
6708bb27 1369 pr_debug(" Vendor: ");
c66ac9db
NB		 1370 for (i = 0; i < 8; i++)
1371 if (wwn->vendor[i] >= 0x20)
6708bb27 1372 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1373 else
6708bb27 1374 pr_debug(" ");
c66ac9db 1375
6708bb27 1376 pr_debug(" Model: ");
c66ac9db
NB		 1377 for (i = 0; i < 16; i++)
1378 if (wwn->model[i] >= 0x20)
6708bb27 1379 pr_debug("%c", wwn->model[i]);
c66ac9db 1380 else
6708bb27 1381 pr_debug(" ");
c66ac9db 1382
6708bb27 1383 pr_debug(" Revision: ");
c66ac9db
NB		 1384 for (i = 0; i < 4; i++)
1385 if (wwn->revision[i] >= 0x20)
6708bb27 1386 pr_debug("%c", wwn->revision[i]);
c66ac9db 1387 else
6708bb27 1388 pr_debug(" ");
c66ac9db 1389
6708bb27 1390 pr_debug("\n");
c66ac9db 1391
e3d6f909 1392 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1393 pr_debug(" Type: %s ", scsi_device_type(device_type));
1394 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1395 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1396}
1397
1398struct se_device *transport_add_device_to_core_hba(
1399 struct se_hba *hba,
1400 struct se_subsystem_api *transport,
1401 struct se_subsystem_dev *se_dev,
1402 u32 device_flags,
1403 void *transport_dev,
1404 struct se_dev_limits *dev_limits,
1405 const char *inquiry_prod,
1406 const char *inquiry_rev)
1407{
12a18bdc 1408 int force_pt;
c66ac9db
NB		 1409 struct se_device *dev;
1410
1411 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1412 if (!dev) {
1413 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1414 return NULL;
1415 }
c66ac9db 1416
e3d6f909 1417 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1418 dev->dev_flags = device_flags;
1419 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1420 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1421 dev->se_hba = hba;
1422 dev->se_sub_dev = se_dev;
1423 dev->transport = transport;
1424 atomic_set(&dev->active_cmds, 0);
1425 INIT_LIST_HEAD(&dev->dev_list);
1426 INIT_LIST_HEAD(&dev->dev_sep_list);
1427 INIT_LIST_HEAD(&dev->dev_tmr_list);
1428 INIT_LIST_HEAD(&dev->execute_task_list);
1429 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1430 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1431 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1432 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1433 spin_lock_init(&dev->execute_task_lock);
1434 spin_lock_init(&dev->delayed_cmd_lock);
1435 spin_lock_init(&dev->ordered_cmd_lock);
1436 spin_lock_init(&dev->state_task_lock);
1437 spin_lock_init(&dev->dev_alua_lock);
1438 spin_lock_init(&dev->dev_reservation_lock);
1439 spin_lock_init(&dev->dev_status_lock);
1440 spin_lock_init(&dev->dev_status_thr_lock);
1441 spin_lock_init(&dev->se_port_lock);
1442 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1443 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1444
1445 dev->queue_depth = dev_limits->queue_depth;
1446 atomic_set(&dev->depth_left, dev->queue_depth);
1447 atomic_set(&dev->dev_ordered_id, 0);
1448
1449 se_dev_set_default_attribs(dev, dev_limits);
1450
1451 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1452 dev->creation_time = get_jiffies_64();
1453 spin_lock_init(&dev->stats_lock);
1454
1455 spin_lock(&hba->device_lock);
1456 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1457 hba->dev_count++;
1458 spin_unlock(&hba->device_lock);
1459 /*
1460 * Setup the SAM Task Attribute emulation for struct se_device
1461 */
1462 core_setup_task_attr_emulation(dev);
1463 /*
1464 * Force PR and ALUA passthrough emulation with internal object use.
1465 */
1466 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1467 /*
1468 * Setup the Reservations infrastructure for struct se_device
1469 */
1470 core_setup_reservations(dev, force_pt);
1471 /*
1472 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1473 */
1474 if (core_setup_alua(dev, force_pt) < 0)
1475 goto out;
1476
1477 /*
1478 * Startup the struct se_device processing thread
1479 */
1480 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1481 "LIO_%s", dev->transport->name);
c66ac9db 1482 if (IS_ERR(dev->process_thread)) {
6708bb27 1483 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1484 dev->transport->name);
c66ac9db
NB		 1485 goto out;
1486 }
07bde79a
NB		 1487 /*
1488 * Setup work_queue for QUEUE_FULL
1489 */
1490 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1491 /*
1492 * Preload the initial INQUIRY const values if we are doing
1493 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1494 * passthrough because this is being provided by the backend LLD.
1495 * This is required so that transport_get_inquiry() copies these
1496 * originals once back into DEV_T10_WWN(dev) for the virtual device
1497 * setup.
1498 */
e3d6f909 1499 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1500 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1501 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1502 " INQUIRY consts\n");
1503 goto out;
1504 }
1505
e3d6f909
AG		 1506 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1507 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1508 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1509 }
1510 scsi_dump_inquiry(dev);
1511
12a18bdc 1512 return dev;
c66ac9db 1513out:
c66ac9db
NB		 1514 kthread_stop(dev->process_thread);
1515
1516 spin_lock(&hba->device_lock);
1517 list_del(&dev->dev_list);
1518 hba->dev_count--;
1519 spin_unlock(&hba->device_lock);
1520
1521 se_release_vpd_for_dev(dev);
1522
c66ac9db
NB		 1523 kfree(dev);
1524
1525 return NULL;
1526}
1527EXPORT_SYMBOL(transport_add_device_to_core_hba);
1528
1529/* transport_generic_prepare_cdb():
1530 *
1531 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1532 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1533 * The point of this is since we are mapping iSCSI LUNs to
1534 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1535 * devices and HBAs for a loop.
1536 */
1537static inline void transport_generic_prepare_cdb(
1538 unsigned char *cdb)
1539{
1540 switch (cdb[0]) {
1541 case READ_10: /* SBC - RDProtect */
1542 case READ_12: /* SBC - RDProtect */
1543 case READ_16: /* SBC - RDProtect */
1544 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1545 case VERIFY: /* SBC - VRProtect */
1546 case VERIFY_16: /* SBC - VRProtect */
1547 case WRITE_VERIFY: /* SBC - VRProtect */
1548 case WRITE_VERIFY_12: /* SBC - VRProtect */
1549 break;
1550 default:
1551 cdb[1] &= 0x1f; /* clear logical unit number */
1552 break;
1553 }
1554}
1555
1556static struct se_task *
1557transport_generic_get_task(struct se_cmd *cmd,
1558 enum dma_data_direction data_direction)
1559{
1560 struct se_task *task;
5951146d 1561 struct se_device *dev = cmd->se_dev;
c66ac9db 1562
6708bb27 1563 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1564 if (!task) {
6708bb27 1565 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1566 return NULL;
1567 }
1568
1569 INIT_LIST_HEAD(&task->t_list);
1570 INIT_LIST_HEAD(&task->t_execute_list);
1571 INIT_LIST_HEAD(&task->t_state_list);
1572 init_completion(&task->task_stop_comp);
c66ac9db
NB		 1573 task->task_se_cmd = cmd;
1574 task->se_dev = dev;
1575 task->task_data_direction = data_direction;
1576
c66ac9db
NB		 1577 return task;
1578}
1579
1580static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1581
c66ac9db
NB		 1582/*
1583 * Used by fabric modules containing a local struct se_cmd within their
1584 * fabric dependent per I/O descriptor.
1585 */
1586void transport_init_se_cmd(
1587 struct se_cmd *cmd,
1588 struct target_core_fabric_ops *tfo,
1589 struct se_session *se_sess,
1590 u32 data_length,
1591 int data_direction,
1592 int task_attr,
1593 unsigned char *sense_buffer)
1594{
5951146d
AG		 1595 INIT_LIST_HEAD(&cmd->se_lun_node);
1596 INIT_LIST_HEAD(&cmd->se_delayed_node);
1597 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1598 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1599 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1600
a1d8b49a
AG		 1601 INIT_LIST_HEAD(&cmd->t_task_list);
1602 init_completion(&cmd->transport_lun_fe_stop_comp);
1603 init_completion(&cmd->transport_lun_stop_comp);
1604 init_completion(&cmd->t_transport_stop_comp);
1605 spin_lock_init(&cmd->t_state_lock);
1606 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1607
1608 cmd->se_tfo = tfo;
1609 cmd->se_sess = se_sess;
1610 cmd->data_length = data_length;
1611 cmd->data_direction = data_direction;
1612 cmd->sam_task_attr = task_attr;
1613 cmd->sense_buffer = sense_buffer;
1614}
1615EXPORT_SYMBOL(transport_init_se_cmd);
1616
1617static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1618{
1619 /*
1620 * Check if SAM Task Attribute emulation is enabled for this
1621 * struct se_device storage object
1622 */
5951146d 1623 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1624 return 0;
1625
e66ecd50 1626 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1627 pr_debug("SAM Task Attribute ACA"
c66ac9db 1628 " emulation is not supported\n");
e3d6f909 1629 return -EINVAL;
c66ac9db
NB		 1630 }
1631 /*
1632 * Used to determine when ORDERED commands should go from
1633 * Dormant to Active status.
1634 */
5951146d 1635 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1636 smp_mb__after_atomic_inc();
6708bb27 1637 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1638 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1639 cmd->se_dev->transport->name);
c66ac9db
NB		 1640 return 0;
1641}
1642
c66ac9db
NB		 1643static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1644
1645/* transport_generic_allocate_tasks():
1646 *
1647 * Called from fabric RX Thread.
1648 */
1649int transport_generic_allocate_tasks(
1650 struct se_cmd *cmd,
1651 unsigned char *cdb)
1652{
1653 int ret;
1654
1655 transport_generic_prepare_cdb(cdb);
1656
1657 /*
1658 * This is needed for early exceptions.
1659 */
1660 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1661
c66ac9db
NB		 1662 /*
1663 * Ensure that the received CDB is less than the max (252 + 8) bytes
1664 * for VARIABLE_LENGTH_CMD
1665 */
1666 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1667 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1668 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1669 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1670 return -EINVAL;
c66ac9db
NB		 1671 }
1672 /*
1673 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1674 * allocate the additional extended CDB buffer now.. Otherwise
1675 * setup the pointer from __t_task_cdb to t_task_cdb.
1676 */
a1d8b49a
AG		 1677 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1678 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1679 GFP_KERNEL);
6708bb27
AG		 1680 if (!cmd->t_task_cdb) {
1681 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1682 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1683 scsi_command_size(cdb),
a1d8b49a 1684 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1685 return -ENOMEM;
c66ac9db
NB		 1686 }
1687 } else
a1d8b49a 1688 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1689 /*
a1d8b49a 1690 * Copy the original CDB into cmd->
c66ac9db 1691 */
a1d8b49a 1692 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1693 /*
1694 * Setup the received CDB based on SCSI defined opcodes and
1695 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1696 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1697 * pointer is expected to be setup before we reach this point.
1698 */
1699 ret = transport_generic_cmd_sequencer(cmd, cdb);
1700 if (ret < 0)
1701 return ret;
1702 /*
1703 * Check for SAM Task Attribute Emulation
1704 */
1705 if (transport_check_alloc_task_attr(cmd) < 0) {
1706 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1707 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1708 return -EINVAL;
c66ac9db
NB		 1709 }
1710 spin_lock(&cmd->se_lun->lun_sep_lock);
1711 if (cmd->se_lun->lun_sep)
1712 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1713 spin_unlock(&cmd->se_lun->lun_sep_lock);
1714 return 0;
1715}
1716EXPORT_SYMBOL(transport_generic_allocate_tasks);
1717
dd8ae59d
NB		 1718static void transport_generic_request_failure(struct se_cmd *,
1719 struct se_device *, int, int);
695434e1
NB		 1720/*
1721 * Used by fabric module frontends to queue tasks directly.
1722 * Many only be used from process context only
1723 */
1724int transport_handle_cdb_direct(
1725 struct se_cmd *cmd)
1726{
dd8ae59d
NB		 1727 int ret;
1728
695434e1
NB		 1729 if (!cmd->se_lun) {
1730 dump_stack();
6708bb27 1731 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1732 return -EINVAL;
1733 }
1734 if (in_interrupt()) {
1735 dump_stack();
6708bb27 1736 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1737 " from interrupt context\n");
1738 return -EINVAL;
1739 }
dd8ae59d
NB		 1740 /*
1741 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1742 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1743 * in existing usage to ensure that outstanding descriptors are handled
1744 * correctly during shutdown via transport_generic_wait_for_tasks()
1745 *
1746 * Also, we don't take cmd->t_state_lock here as we only expect
1747 * this to be called for initial descriptor submission.
1748 */
1749 cmd->t_state = TRANSPORT_NEW_CMD;
1750 atomic_set(&cmd->t_transport_active, 1);
1751 /*
1752 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1753 * so follow TRANSPORT_NEW_CMD processing thread context usage
1754 * and call transport_generic_request_failure() if necessary..
1755 */
1756 ret = transport_generic_new_cmd(cmd);
1757 if (ret == -EAGAIN)
1758 return 0;
1759 else if (ret < 0) {
1760 cmd->transport_error_status = ret;
1761 transport_generic_request_failure(cmd, NULL, 0,
1762 (cmd->data_direction != DMA_TO_DEVICE));
1763 }
1764 return 0;
695434e1
NB		 1765}
1766EXPORT_SYMBOL(transport_handle_cdb_direct);
1767
c66ac9db
NB		 1768/*
1769 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1770 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1771 * complete setup in TCM process context w/ TFO->new_cmd_map().
1772 */
1773int transport_generic_handle_cdb_map(
1774 struct se_cmd *cmd)
1775{
e3d6f909 1776 if (!cmd->se_lun) {
c66ac9db 1777 dump_stack();
6708bb27 1778 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1779 return -EINVAL;
c66ac9db
NB		 1780 }
1781
1782 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1783 return 0;
1784}
1785EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1786
1787/* transport_generic_handle_data():
1788 *
1789 *
1790 */
1791int transport_generic_handle_data(
1792 struct se_cmd *cmd)
1793{
1794 /*
1795 * For the software fabric case, then we assume the nexus is being
1796 * failed/shutdown when signals are pending from the kthread context
1797 * caller, so we return a failure. For the HW target mode case running
1798 * in interrupt code, the signal_pending() check is skipped.
1799 */
1800 if (!in_interrupt() && signal_pending(current))
e3d6f909 1801 return -EPERM;
c66ac9db
NB		 1802 /*
1803 * If the received CDB has aleady been ABORTED by the generic
1804 * target engine, we now call transport_check_aborted_status()
1805 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1806 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1807 * sequences at this point.
1808 */
1809 if (transport_check_aborted_status(cmd, 1) != 0)
1810 return 0;
1811
1812 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1813 return 0;
1814}
1815EXPORT_SYMBOL(transport_generic_handle_data);
1816
1817/* transport_generic_handle_tmr():
1818 *
1819 *
1820 */
1821int transport_generic_handle_tmr(
1822 struct se_cmd *cmd)
1823{
1824 /*
1825 * This is needed for early exceptions.
1826 */
1827 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
c66ac9db
NB		 1828
1829 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1830 return 0;
1831}
1832EXPORT_SYMBOL(transport_generic_handle_tmr);
1833
f4366772
NB		 1834void transport_generic_free_cmd_intr(
1835 struct se_cmd *cmd)
1836{
1837 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1838}
1839EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1840
c66ac9db
NB		 1841static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1842{
1843 struct se_task *task, *task_tmp;
1844 unsigned long flags;
1845 int ret = 0;
1846
6708bb27 1847 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1848 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1849
1850 /*
1851 * No tasks remain in the execution queue
1852 */
a1d8b49a 1853 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1854 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1855 &cmd->t_task_list, t_list) {
6708bb27 1856 pr_debug("task_no[%d] - Processing task %p\n",
c66ac9db
NB		 1857 task->task_no, task);
1858 /*
1859 * If the struct se_task has not been sent and is not active,
1860 * remove the struct se_task from the execution queue.
1861 */
1862 if (!atomic_read(&task->task_sent) &&
1863 !atomic_read(&task->task_active)) {
a1d8b49a 1864 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1865 flags);
1866 transport_remove_task_from_execute_queue(task,
1867 task->se_dev);
1868
6708bb27 1869 pr_debug("task_no[%d] - Removed from execute queue\n",
c66ac9db 1870 task->task_no);
a1d8b49a 1871 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1872 continue;
1873 }
1874
1875 /*
1876 * If the struct se_task is active, sleep until it is returned
1877 * from the plugin.
1878 */
1879 if (atomic_read(&task->task_active)) {
1880 atomic_set(&task->task_stop, 1);
a1d8b49a 1881 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1882 flags);
1883
6708bb27 1884 pr_debug("task_no[%d] - Waiting to complete\n",
c66ac9db
NB		 1885 task->task_no);
1886 wait_for_completion(&task->task_stop_comp);
6708bb27 1887 pr_debug("task_no[%d] - Stopped successfully\n",
c66ac9db
NB		 1888 task->task_no);
1889
a1d8b49a
AG		 1890 spin_lock_irqsave(&cmd->t_state_lock, flags);
1891 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 1892
1893 atomic_set(&task->task_active, 0);
1894 atomic_set(&task->task_stop, 0);
1895 } else {
6708bb27 1896 pr_debug("task_no[%d] - Did nothing\n", task->task_no);
c66ac9db
NB		 1897 ret++;
1898 }
1899
1900 __transport_stop_task_timer(task, &flags);
1901 }
a1d8b49a 1902 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1903
1904 return ret;
1905}
1906
c66ac9db
NB		 1907/*
1908 * Handle SAM-esque emulation for generic transport request failures.
1909 */
1910static void transport_generic_request_failure(
1911 struct se_cmd *cmd,
1912 struct se_device *dev,
1913 int complete,
1914 int sc)
1915{
07bde79a
NB		 1916 int ret = 0;
1917
6708bb27 1918 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1919 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1920 cmd->t_task_cdb[0]);
6708bb27 1921 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1922 " %d/%d transport_error_status: %d\n",
e3d6f909 1923 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1924 cmd->t_state, cmd->deferred_t_state,
1925 cmd->transport_error_status);
6708bb27 1926 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1927 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1928 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1929 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1930 atomic_read(&cmd->t_task_cdbs_left),
1931 atomic_read(&cmd->t_task_cdbs_sent),
1932 atomic_read(&cmd->t_task_cdbs_ex_left),
1933 atomic_read(&cmd->t_transport_active),
1934 atomic_read(&cmd->t_transport_stop),
1935 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 1936
1937 transport_stop_all_task_timers(cmd);
1938
1939 if (dev)
e3d6f909 1940 atomic_inc(&dev->depth_left);
c66ac9db
NB		 1941 /*
1942 * For SAM Task Attribute emulation for failed struct se_cmd
1943 */
1944 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1945 transport_complete_task_attr(cmd);
1946
1947 if (complete) {
1948 transport_direct_request_timeout(cmd);
1949 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1950 }
1951
1952 switch (cmd->transport_error_status) {
1953 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1954 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1955 break;
1956 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1957 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1958 break;
1959 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1960 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1961 break;
1962 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1963 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1964 break;
1965 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1966 if (!sc)
1967 transport_new_cmd_failure(cmd);
1968 /*
1969 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1970 * we force this session to fall back to session
1971 * recovery.
1972 */
e3d6f909
AG		 1973 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1974 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1975
1976 goto check_stop;
1977 case PYX_TRANSPORT_LU_COMM_FAILURE:
1978 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1979 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1980 break;
1981 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1982 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1983 break;
1984 case PYX_TRANSPORT_WRITE_PROTECTED:
1985 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1986 break;
1987 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1988 /*
1989 * No SENSE Data payload for this case, set SCSI Status
1990 * and queue the response to $FABRIC_MOD.
1991 *
1992 * Uses linux/include/scsi/scsi.h SAM status codes defs
1993 */
1994 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1995 /*
1996 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1997 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1998 * CONFLICT STATUS.
1999 *
2000 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2001 */
e3d6f909
AG		 2002 if (cmd->se_sess &&
2003 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2004 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2005 cmd->orig_fe_lun, 0x2C,
2006 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2007
07bde79a
NB		 2008 ret = cmd->se_tfo->queue_status(cmd);
2009 if (ret == -EAGAIN)
2010 goto queue_full;
c66ac9db
NB		 2011 goto check_stop;
2012 case PYX_TRANSPORT_USE_SENSE_REASON:
2013 /*
2014 * struct se_cmd->scsi_sense_reason already set
2015 */
2016 break;
2017 default:
6708bb27 2018 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 2019 cmd->t_task_cdb[0],
c66ac9db
NB		 2020 cmd->transport_error_status);
2021 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2022 break;
2023 }
16ab8e60
NB		 2024 /*
2025 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2026 * make the call to transport_send_check_condition_and_sense()
2027 * directly. Otherwise expect the fabric to make the call to
2028 * transport_send_check_condition_and_sense() after handling
2029 * possible unsoliticied write data payloads.
2030 */
2031 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 2032 transport_new_cmd_failure(cmd);
07bde79a
NB		 2033 else {
2034 ret = transport_send_check_condition_and_sense(cmd,
2035 cmd->scsi_sense_reason, 0);
2036 if (ret == -EAGAIN)
2037 goto queue_full;
2038 }
2039
c66ac9db
NB		 2040check_stop:
2041 transport_lun_remove_cmd(cmd);
6708bb27 2042 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2043 ;
07bde79a
NB		 2044 return;
2045
2046queue_full:
2047 cmd->t_state = TRANSPORT_COMPLETE_OK;
2048 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 2049}
2050
2051static void transport_direct_request_timeout(struct se_cmd *cmd)
2052{
2053 unsigned long flags;
2054
a1d8b49a 2055 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 2056 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 2057 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2058 return;
2059 }
a1d8b49a
AG		 2060 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2061 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2062 return;
2063 }
2064
a1d8b49a
AG		 2065 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2066 &cmd->t_se_count);
2067 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2068}
2069
2070static void transport_generic_request_timeout(struct se_cmd *cmd)
2071{
2072 unsigned long flags;
2073
2074 /*
a1d8b49a 2075 * Reset cmd->t_se_count to allow transport_generic_remove()
c66ac9db
NB		 2076 * to allow last call to free memory resources.
2077 */
a1d8b49a
AG		 2078 spin_lock_irqsave(&cmd->t_state_lock, flags);
2079 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2080 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2081
a1d8b49a 2082 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2083 }
a1d8b49a 2084 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2085
35462975 2086 transport_generic_remove(cmd, 0);
c66ac9db
NB		 2087}
2088
c66ac9db
NB		 2089static inline u32 transport_lba_21(unsigned char *cdb)
2090{
2091 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2092}
2093
2094static inline u32 transport_lba_32(unsigned char *cdb)
2095{
2096 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2097}
2098
2099static inline unsigned long long transport_lba_64(unsigned char *cdb)
2100{
2101 unsigned int __v1, __v2;
2102
2103 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2104 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2105
2106 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2107}
2108
2109/*
2110 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2111 */
2112static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2113{
2114 unsigned int __v1, __v2;
2115
2116 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2117 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2118
2119 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2120}
2121
2122static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2123{
2124 unsigned long flags;
2125
a1d8b49a 2126 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2127 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2128 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2129}
2130
2131/*
2132 * Called from interrupt context.
2133 */
2134static void transport_task_timeout_handler(unsigned long data)
2135{
2136 struct se_task *task = (struct se_task *)data;
e3d6f909 2137 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2138 unsigned long flags;
2139
6708bb27 2140 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2141
a1d8b49a 2142 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2143 if (task->task_flags & TF_STOP) {
a1d8b49a 2144 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2145 return;
2146 }
2147 task->task_flags &= ~TF_RUNNING;
2148
2149 /*
2150 * Determine if transport_complete_task() has already been called.
2151 */
6708bb27
AG		 2152 if (!atomic_read(&task->task_active)) {
2153 pr_debug("transport task: %p cmd: %p timeout task_active"
c66ac9db 2154 " == 0\n", task, cmd);
a1d8b49a 2155 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2156 return;
2157 }
2158
a1d8b49a
AG		 2159 atomic_inc(&cmd->t_se_count);
2160 atomic_inc(&cmd->t_transport_timeout);
2161 cmd->t_tasks_failed = 1;
c66ac9db
NB		 2162
2163 atomic_set(&task->task_timeout, 1);
2164 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2165 task->task_scsi_status = 1;
2166
2167 if (atomic_read(&task->task_stop)) {
6708bb27 2168 pr_debug("transport task: %p cmd: %p timeout task_stop"
c66ac9db 2169 " == 1\n", task, cmd);
a1d8b49a 2170 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2171 complete(&task->task_stop_comp);
2172 return;
2173 }
2174
6708bb27
AG		 2175 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2176 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2177 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2178 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2179 return;
2180 }
6708bb27 2181 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2182 task, cmd);
2183
2184 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2185 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2186
2187 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2188}
2189
2190/*
a1d8b49a 2191 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2192 */
2193static void transport_start_task_timer(struct se_task *task)
2194{
2195 struct se_device *dev = task->se_dev;
2196 int timeout;
2197
2198 if (task->task_flags & TF_RUNNING)
2199 return;
2200 /*
2201 * If the task_timeout is disabled, exit now.
2202 */
e3d6f909 2203 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2204 if (!timeout)
c66ac9db
NB		 2205 return;
2206
2207 init_timer(&task->task_timer);
2208 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2209 task->task_timer.data = (unsigned long) task;
2210 task->task_timer.function = transport_task_timeout_handler;
2211
2212 task->task_flags |= TF_RUNNING;
2213 add_timer(&task->task_timer);
2214#if 0
6708bb27 2215 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
c66ac9db
NB		 2216 " %d\n", task->task_se_cmd, task, timeout);
2217#endif
2218}
2219
2220/*
a1d8b49a 2221 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2222 */
2223void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2224{
e3d6f909 2225 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db 2226
6708bb27 2227 if (!task->task_flags & TF_RUNNING)
c66ac9db
NB		 2228 return;
2229
2230 task->task_flags |= TF_STOP;
a1d8b49a 2231 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2232
2233 del_timer_sync(&task->task_timer);
2234
a1d8b49a 2235 spin_lock_irqsave(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2236 task->task_flags &= ~TF_RUNNING;
2237 task->task_flags &= ~TF_STOP;
2238}
2239
2240static void transport_stop_all_task_timers(struct se_cmd *cmd)
2241{
2242 struct se_task *task = NULL, *task_tmp;
2243 unsigned long flags;
2244
a1d8b49a 2245 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2246 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2247 &cmd->t_task_list, t_list)
c66ac9db 2248 __transport_stop_task_timer(task, &flags);
a1d8b49a 2249 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2250}
2251
2252static inline int transport_tcq_window_closed(struct se_device *dev)
2253{
2254 if (dev->dev_tcq_window_closed++ <
2255 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2256 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2257 } else
2258 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2259
e3d6f909 2260 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2261 return 0;
2262}
2263
2264/*
2265 * Called from Fabric Module context from transport_execute_tasks()
2266 *
2267 * The return of this function determins if the tasks from struct se_cmd
2268 * get added to the execution queue in transport_execute_tasks(),
2269 * or are added to the delayed or ordered lists here.
2270 */
2271static inline int transport_execute_task_attr(struct se_cmd *cmd)
2272{
5951146d 2273 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2274 return 1;
2275 /*
25985edc 2276 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2277 * to allow the passed struct se_cmd list of tasks to the front of the list.
2278 */
e66ecd50 2279 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2280 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2281 smp_mb__after_atomic_inc();
6708bb27 2282 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2283 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2284 cmd->t_task_cdb[0],
c66ac9db
NB		 2285 cmd->se_ordered_id);
2286 return 1;
e66ecd50 2287 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2288 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2289 list_add_tail(&cmd->se_ordered_node,
2290 &cmd->se_dev->ordered_cmd_list);
2291 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2292
5951146d 2293 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2294 smp_mb__after_atomic_inc();
2295
6708bb27 2296 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2297 " list, se_ordered_id: %u\n",
a1d8b49a 2298 cmd->t_task_cdb[0],
c66ac9db
NB		 2299 cmd->se_ordered_id);
2300 /*
2301 * Add ORDERED command to tail of execution queue if
2302 * no other older commands exist that need to be
2303 * completed first.
2304 */
6708bb27 2305 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2306 return 1;
2307 } else {
2308 /*
2309 * For SIMPLE and UNTAGGED Task Attribute commands
2310 */
5951146d 2311 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2312 smp_mb__after_atomic_inc();
2313 }
2314 /*
2315 * Otherwise if one or more outstanding ORDERED task attribute exist,
2316 * add the dormant task(s) built for the passed struct se_cmd to the
2317 * execution queue and become in Active state for this struct se_device.
2318 */
5951146d 2319 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2320 /*
2321 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2322 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2323 */
5951146d 2324 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2325 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2326 list_add_tail(&cmd->se_delayed_node,
2327 &cmd->se_dev->delayed_cmd_list);
2328 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2329
6708bb27 2330 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2331 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2332 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2333 cmd->se_ordered_id);
2334 /*
2335 * Return zero to let transport_execute_tasks() know
2336 * not to add the delayed tasks to the execution list.
2337 */
2338 return 0;
2339 }
2340 /*
2341 * Otherwise, no ORDERED task attributes exist..
2342 */
2343 return 1;
2344}
2345
2346/*
2347 * Called from fabric module context in transport_generic_new_cmd() and
2348 * transport_generic_process_write()
2349 */
2350static int transport_execute_tasks(struct se_cmd *cmd)
2351{
2352 int add_tasks;
2353
db1620a2
CH		 2354 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2355 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2356 transport_generic_request_failure(cmd, NULL, 0, 1);
2357 return 0;
c66ac9db 2358 }
db1620a2 2359
c66ac9db
NB		 2360 /*
2361 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2362 * has occurred that prevents execution.
c66ac9db 2363 */
6708bb27 2364 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2365 /*
2366 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2367 * attribute for the tasks of the received struct se_cmd CDB
2368 */
2369 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2370 if (!add_tasks)
c66ac9db
NB		 2371 goto execute_tasks;
2372 /*
2373 * This calls transport_add_tasks_from_cmd() to handle
2374 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2375 * (if enabled) in __transport_add_task_to_execute_queue() and
2376 * transport_add_task_check_sam_attr().
2377 */
2378 transport_add_tasks_from_cmd(cmd);
2379 }
2380 /*
2381 * Kick the execution queue for the cmd associated struct se_device
2382 * storage object.
2383 */
2384execute_tasks:
5951146d 2385 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2386 return 0;
2387}
2388
2389/*
2390 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2391 * from struct se_device->execute_task_list and
2392 *
2393 * Called from transport_processing_thread()
2394 */
2395static int __transport_execute_tasks(struct se_device *dev)
2396{
2397 int error;
2398 struct se_cmd *cmd = NULL;
e3d6f909 2399 struct se_task *task = NULL;
c66ac9db
NB		 2400 unsigned long flags;
2401
2402 /*
2403 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2404 * struct se_tasks to the selected transport.
c66ac9db
NB		 2405 */
2406check_depth:
e3d6f909 2407 if (!atomic_read(&dev->depth_left))
c66ac9db 2408 return transport_tcq_window_closed(dev);
c66ac9db 2409
e3d6f909 2410 dev->dev_tcq_window_closed = 0;
c66ac9db 2411
e3d6f909
AG		 2412 spin_lock_irq(&dev->execute_task_lock);
2413 if (list_empty(&dev->execute_task_list)) {
2414 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2415 return 0;
2416 }
e3d6f909
AG		 2417 task = list_first_entry(&dev->execute_task_list,
2418 struct se_task, t_execute_list);
2419 list_del(&task->t_execute_list);
2420 atomic_set(&task->task_execute_queue, 0);
2421 atomic_dec(&dev->execute_tasks);
2422 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2423
2424 atomic_dec(&dev->depth_left);
c66ac9db 2425
e3d6f909 2426 cmd = task->task_se_cmd;
c66ac9db 2427
a1d8b49a 2428 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2429 atomic_set(&task->task_active, 1);
2430 atomic_set(&task->task_sent, 1);
a1d8b49a 2431 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2432
a1d8b49a
AG		 2433 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2434 cmd->t_task_list_num)
c66ac9db
NB		 2435 atomic_set(&cmd->transport_sent, 1);
2436
2437 transport_start_task_timer(task);
a1d8b49a 2438 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2439 /*
2440 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2441 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2442 * struct se_subsystem_api->do_task() caller below.
2443 */
2444 if (cmd->transport_emulate_cdb) {
2445 error = cmd->transport_emulate_cdb(cmd);
2446 if (error != 0) {
2447 cmd->transport_error_status = error;
2448 atomic_set(&task->task_active, 0);
2449 atomic_set(&cmd->transport_sent, 0);
2450 transport_stop_tasks_for_cmd(cmd);
2451 transport_generic_request_failure(cmd, dev, 0, 1);
2452 goto check_depth;
2453 }
2454 /*
2455 * Handle the successful completion for transport_emulate_cdb()
2456 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2457 * Otherwise the caller is expected to complete the task with
2458 * proper status.
2459 */
2460 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2461 cmd->scsi_status = SAM_STAT_GOOD;
2462 task->task_scsi_status = GOOD;
2463 transport_complete_task(task, 1);
2464 }
2465 } else {
2466 /*
2467 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2468 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2469 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2470 * LUN emulation code.
2471 *
2472 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2473 * call ->do_task() directly and let the underlying TCM subsystem plugin
2474 * code handle the CDB emulation.
2475 */
e3d6f909
AG		 2476 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2477 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2478 error = transport_emulate_control_cdb(task);
2479 else
e3d6f909 2480 error = dev->transport->do_task(task);
c66ac9db
NB		 2481
2482 if (error != 0) {
2483 cmd->transport_error_status = error;
2484 atomic_set(&task->task_active, 0);
2485 atomic_set(&cmd->transport_sent, 0);
2486 transport_stop_tasks_for_cmd(cmd);
2487 transport_generic_request_failure(cmd, dev, 0, 1);
2488 }
2489 }
2490
2491 goto check_depth;
2492
2493 return 0;
2494}
2495
2496void transport_new_cmd_failure(struct se_cmd *se_cmd)
2497{
2498 unsigned long flags;
2499 /*
2500 * Any unsolicited data will get dumped for failed command inside of
2501 * the fabric plugin
2502 */
a1d8b49a 2503 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2504 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2505 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2506 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2507}
2508
2509static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2510
2511static inline u32 transport_get_sectors_6(
2512 unsigned char *cdb,
2513 struct se_cmd *cmd,
2514 int *ret)
2515{
5951146d 2516 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2517
2518 /*
2519 * Assume TYPE_DISK for non struct se_device objects.
2520 * Use 8-bit sector value.
2521 */
2522 if (!dev)
2523 goto type_disk;
2524
2525 /*
2526 * Use 24-bit allocation length for TYPE_TAPE.
2527 */
e3d6f909 2528 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2529 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2530
2531 /*
2532 * Everything else assume TYPE_DISK Sector CDB location.
2533 * Use 8-bit sector value.
2534 */
2535type_disk:
2536 return (u32)cdb[4];
2537}
2538
2539static inline u32 transport_get_sectors_10(
2540 unsigned char *cdb,
2541 struct se_cmd *cmd,
2542 int *ret)
2543{
5951146d 2544 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2545
2546 /*
2547 * Assume TYPE_DISK for non struct se_device objects.
2548 * Use 16-bit sector value.
2549 */
2550 if (!dev)
2551 goto type_disk;
2552
2553 /*
2554 * XXX_10 is not defined in SSC, throw an exception
2555 */
e3d6f909
AG		 2556 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2557 *ret = -EINVAL;
c66ac9db
NB		 2558 return 0;
2559 }
2560
2561 /*
2562 * Everything else assume TYPE_DISK Sector CDB location.
2563 * Use 16-bit sector value.
2564 */
2565type_disk:
2566 return (u32)(cdb[7] << 8) + cdb[8];
2567}
2568
2569static inline u32 transport_get_sectors_12(
2570 unsigned char *cdb,
2571 struct se_cmd *cmd,
2572 int *ret)
2573{
5951146d 2574 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2575
2576 /*
2577 * Assume TYPE_DISK for non struct se_device objects.
2578 * Use 32-bit sector value.
2579 */
2580 if (!dev)
2581 goto type_disk;
2582
2583 /*
2584 * XXX_12 is not defined in SSC, throw an exception
2585 */
e3d6f909
AG		 2586 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2587 *ret = -EINVAL;
c66ac9db
NB		 2588 return 0;
2589 }
2590
2591 /*
2592 * Everything else assume TYPE_DISK Sector CDB location.
2593 * Use 32-bit sector value.
2594 */
2595type_disk:
2596 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2597}
2598
2599static inline u32 transport_get_sectors_16(
2600 unsigned char *cdb,
2601 struct se_cmd *cmd,
2602 int *ret)
2603{
5951146d 2604 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2605
2606 /*
2607 * Assume TYPE_DISK for non struct se_device objects.
2608 * Use 32-bit sector value.
2609 */
2610 if (!dev)
2611 goto type_disk;
2612
2613 /*
2614 * Use 24-bit allocation length for TYPE_TAPE.
2615 */
e3d6f909 2616 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2617 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2618
2619type_disk:
2620 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2621 (cdb[12] << 8) + cdb[13];
2622}
2623
2624/*
2625 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2626 */
2627static inline u32 transport_get_sectors_32(
2628 unsigned char *cdb,
2629 struct se_cmd *cmd,
2630 int *ret)
2631{
2632 /*
2633 * Assume TYPE_DISK for non struct se_device objects.
2634 * Use 32-bit sector value.
2635 */
2636 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2637 (cdb[30] << 8) + cdb[31];
2638
2639}
2640
2641static inline u32 transport_get_size(
2642 u32 sectors,
2643 unsigned char *cdb,
2644 struct se_cmd *cmd)
2645{
5951146d 2646 struct se_device *dev = cmd->se_dev;
c66ac9db 2647
e3d6f909 2648 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2649 if (cdb[1] & 1) { /* sectors */
e3d6f909 2650 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2651 } else /* bytes */
2652 return sectors;
2653 }
2654#if 0
6708bb27 2655 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2656 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2657 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2658 dev->transport->name);
c66ac9db 2659#endif
e3d6f909 2660 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2661}
2662
c66ac9db
NB		 2663static void transport_xor_callback(struct se_cmd *cmd)
2664{
2665 unsigned char *buf, *addr;
ec98f782 2666 struct scatterlist *sg;
c66ac9db
NB		 2667 unsigned int offset;
2668 int i;
ec98f782 2669 int count;
c66ac9db
NB		 2670 /*
2671 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2672 *
2673 * 1) read the specified logical block(s);
2674 * 2) transfer logical blocks from the data-out buffer;
2675 * 3) XOR the logical blocks transferred from the data-out buffer with
2676 * the logical blocks read, storing the resulting XOR data in a buffer;
2677 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2678 * blocks transferred from the data-out buffer; and
2679 * 5) transfer the resulting XOR data to the data-in buffer.
2680 */
2681 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2682 if (!buf) {
2683 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2684 return;
2685 }
2686 /*
ec98f782 2687 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2688 * into the locally allocated *buf
2689 */
ec98f782
AG		 2690 sg_copy_to_buffer(cmd->t_data_sg,
2691 cmd->t_data_nents,
2692 buf,
2693 cmd->data_length);
2694
c66ac9db
NB		 2695 /*
2696 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2697 * cmd->t_mem_bidi_list
c66ac9db
NB		 2698 */
2699
2700 offset = 0;
ec98f782
AG		 2701 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2702 addr = kmap_atomic(sg_page(sg), KM_USER0);
2703 if (!addr)
c66ac9db
NB		 2704 goto out;
2705
ec98f782
AG		 2706 for (i = 0; i < sg->length; i++)
2707 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2708
ec98f782 2709 offset += sg->length;
c66ac9db
NB		 2710 kunmap_atomic(addr, KM_USER0);
2711 }
ec98f782 2712
c66ac9db
NB		 2713out:
2714 kfree(buf);
2715}
2716
2717/*
2718 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2719 */
2720static int transport_get_sense_data(struct se_cmd *cmd)
2721{
2722 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2723 struct se_device *dev;
2724 struct se_task *task = NULL, *task_tmp;
2725 unsigned long flags;
2726 u32 offset = 0;
2727
e3d6f909
AG		 2728 WARN_ON(!cmd->se_lun);
2729
a1d8b49a 2730 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2731 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2732 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2733 return 0;
2734 }
2735
2736 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2737 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2738
2739 if (!task->task_sense)
2740 continue;
2741
2742 dev = task->se_dev;
6708bb27 2743 if (!dev)
c66ac9db
NB		 2744 continue;
2745
e3d6f909 2746 if (!dev->transport->get_sense_buffer) {
6708bb27 2747 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2748 " is NULL\n");
2749 continue;
2750 }
2751
e3d6f909 2752 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27
AG		 2753 if (!sense_buffer) {
2754 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
c66ac9db 2755 " sense buffer for task with sense\n",
e3d6f909 2756 cmd->se_tfo->get_task_tag(cmd), task->task_no);
c66ac9db
NB		 2757 continue;
2758 }
a1d8b49a 2759 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2760
e3d6f909 2761 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2762 TRANSPORT_SENSE_BUFFER);
2763
5951146d 2764 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2765 TRANSPORT_SENSE_BUFFER);
2766 cmd->scsi_status = task->task_scsi_status;
2767 /* Automatically padded */
2768 cmd->scsi_sense_length =
2769 (TRANSPORT_SENSE_BUFFER + offset);
2770
6708bb27 2771 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2772 " and sense\n",
e3d6f909 2773 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2774 cmd->scsi_status);
2775 return 0;
2776 }
a1d8b49a 2777 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2778
2779 return -1;
2780}
2781
c66ac9db
NB		 2782static int
2783transport_handle_reservation_conflict(struct se_cmd *cmd)
2784{
2785 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2786 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2787 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2788 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2789 /*
2790 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2791 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2792 * CONFLICT STATUS.
2793 *
2794 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2795 */
e3d6f909
AG		 2796 if (cmd->se_sess &&
2797 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2798 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2799 cmd->orig_fe_lun, 0x2C,
2800 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2801 return -EINVAL;
c66ac9db
NB		 2802}
2803
ec98f782
AG		 2804static inline long long transport_dev_end_lba(struct se_device *dev)
2805{
2806 return dev->transport->get_blocks(dev) + 1;
2807}
2808
2809static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2810{
2811 struct se_device *dev = cmd->se_dev;
2812 u32 sectors;
2813
2814 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2815 return 0;
2816
2817 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2818
6708bb27
AG		 2819 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2820 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2821 " transport_dev_end_lba(): %llu\n",
2822 cmd->t_task_lba, sectors,
2823 transport_dev_end_lba(dev));
7abbe7f3 2824 return -EINVAL;
ec98f782
AG		 2825 }
2826
7abbe7f3 2827 return 0;
ec98f782
AG		 2828}
2829
706d5860
NB		 2830static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2831{
2832 /*
2833 * Determine if the received WRITE_SAME is used to for direct
2834 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2835 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2836 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2837 */
2838 int passthrough = (dev->transport->transport_type ==
2839 TRANSPORT_PLUGIN_PHBA_PDEV);
2840
2841 if (!passthrough) {
2842 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2843 pr_err("WRITE_SAME PBDATA and LBDATA"
2844 " bits not supported for Block Discard"
2845 " Emulation\n");
2846 return -ENOSYS;
2847 }
2848 /*
2849 * Currently for the emulated case we only accept
2850 * tpws with the UNMAP=1 bit set.
2851 */
2852 if (!(flags[0] & 0x08)) {
2853 pr_err("WRITE_SAME w/o UNMAP bit not"
2854 " supported for Block Discard Emulation\n");
2855 return -ENOSYS;
2856 }
2857 }
2858
2859 return 0;
2860}
2861
c66ac9db
NB		 2862/* transport_generic_cmd_sequencer():
2863 *
2864 * Generic Command Sequencer that should work for most DAS transport
2865 * drivers.
2866 *
2867 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2868 * RX Thread.
2869 *
2870 * FIXME: Need to support other SCSI OPCODES where as well.
2871 */
2872static int transport_generic_cmd_sequencer(
2873 struct se_cmd *cmd,
2874 unsigned char *cdb)
2875{
5951146d 2876 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2877 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2878 int ret = 0, sector_ret = 0, passthrough;
2879 u32 sectors = 0, size = 0, pr_reg_type = 0;
2880 u16 service_action;
2881 u8 alua_ascq = 0;
2882 /*
2883 * Check for an existing UNIT ATTENTION condition
2884 */
2885 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2886 cmd->transport_wait_for_tasks =
2887 &transport_nop_wait_for_tasks;
2888 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2889 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2890 return -EINVAL;
c66ac9db
NB		 2891 }
2892 /*
2893 * Check status of Asymmetric Logical Unit Assignment port
2894 */
e3d6f909 2895 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db
NB		 2896 if (ret != 0) {
2897 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2898 /*
25985edc 2899 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2900 * The ALUA additional sense code qualifier (ASCQ) is determined
2901 * by the ALUA primary or secondary access state..
2902 */
2903 if (ret > 0) {
2904#if 0
6708bb27 2905 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2906 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2907 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2908#endif
2909 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2910 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2911 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2912 return -EINVAL;
c66ac9db
NB		 2913 }
2914 goto out_invalid_cdb_field;
2915 }
2916 /*
2917 * Check status for SPC-3 Persistent Reservations
2918 */
e3d6f909
AG		 2919 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2920 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2921 cmd, cdb, pr_reg_type) != 0)
2922 return transport_handle_reservation_conflict(cmd);
2923 /*
2924 * This means the CDB is allowed for the SCSI Initiator port
2925 * when said port is *NOT* holding the legacy SPC-2 or
2926 * SPC-3 Persistent Reservation.
2927 */
2928 }
2929
2930 switch (cdb[0]) {
2931 case READ_6:
2932 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2933 if (sector_ret)
2934 goto out_unsupported_cdb;
2935 size = transport_get_size(sectors, cdb, cmd);
2936 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2937 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2938 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2939 break;
2940 case READ_10:
2941 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2942 if (sector_ret)
2943 goto out_unsupported_cdb;
2944 size = transport_get_size(sectors, cdb, cmd);
2945 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 2946 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2947 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2948 break;
2949 case READ_12:
2950 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2951 if (sector_ret)
2952 goto out_unsupported_cdb;
2953 size = transport_get_size(sectors, cdb, cmd);
2954 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a 2955 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2956 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2957 break;
2958 case READ_16:
2959 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2960 if (sector_ret)
2961 goto out_unsupported_cdb;
2962 size = transport_get_size(sectors, cdb, cmd);
2963 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a 2964 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2965 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2966 break;
2967 case WRITE_6:
2968 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2969 if (sector_ret)
2970 goto out_unsupported_cdb;
2971 size = transport_get_size(sectors, cdb, cmd);
2972 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2973 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2974 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2975 break;
2976 case WRITE_10:
2977 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2978 if (sector_ret)
2979 goto out_unsupported_cdb;
2980 size = transport_get_size(sectors, cdb, cmd);
2981 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a
AG		 2982 cmd->t_task_lba = transport_lba_32(cdb);
2983 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2984 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2985 break;
2986 case WRITE_12:
2987 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2988 if (sector_ret)
2989 goto out_unsupported_cdb;
2990 size = transport_get_size(sectors, cdb, cmd);
2991 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a
AG		 2992 cmd->t_task_lba = transport_lba_32(cdb);
2993 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2994 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2995 break;
2996 case WRITE_16:
2997 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2998 if (sector_ret)
2999 goto out_unsupported_cdb;
3000 size = transport_get_size(sectors, cdb, cmd);
3001 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a
AG		 3002 cmd->t_task_lba = transport_lba_64(cdb);
3003 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3004 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3005 break;
3006 case XDWRITEREAD_10:
3007 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 3008 !(cmd->t_tasks_bidi))
c66ac9db
NB		 3009 goto out_invalid_cdb_field;
3010 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3011 if (sector_ret)
3012 goto out_unsupported_cdb;
3013 size = transport_get_size(sectors, cdb, cmd);
3014 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 3015 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 3016 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 3017 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3018 TRANSPORT_PLUGIN_PHBA_PDEV);
3019 /*
3020 * Skip the remaining assignments for TCM/PSCSI passthrough
3021 */
3022 if (passthrough)
3023 break;
3024 /*
3025 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3026 */
3027 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3028 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3029 break;
3030 case VARIABLE_LENGTH_CMD:
3031 service_action = get_unaligned_be16(&cdb[8]);
3032 /*
3033 * Determine if this is TCM/PSCSI device and we should disable
3034 * internal emulation for this CDB.
3035 */
e3d6f909 3036 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3037 TRANSPORT_PLUGIN_PHBA_PDEV);
3038
3039 switch (service_action) {
3040 case XDWRITEREAD_32:
3041 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3042 if (sector_ret)
3043 goto out_unsupported_cdb;
3044 size = transport_get_size(sectors, cdb, cmd);
3045 /*
3046 * Use WRITE_32 and READ_32 opcodes for the emulated
3047 * XDWRITE_READ_32 logic.
3048 */
3049 cmd->transport_split_cdb = &split_cdb_XX_32;
a1d8b49a 3050 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 3051 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3052
3053 /*
3054 * Skip the remaining assignments for TCM/PSCSI passthrough
3055 */
3056 if (passthrough)
3057 break;
3058
3059 /*
3060 * Setup BIDI XOR callback to be run during
3061 * transport_generic_complete_ok()
3062 */
3063 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3064 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 3065 break;
3066 case WRITE_SAME_32:
3067 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3068 if (sector_ret)
3069 goto out_unsupported_cdb;
dd3a5ad8 3070
6708bb27 3071 if (sectors)
12850626 3072 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3073 else {
3074 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3075 " supported\n");
3076 goto out_invalid_cdb_field;
3077 }
dd3a5ad8 3078
a1d8b49a 3079 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 3080 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3081
706d5860 3082 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 3083 goto out_invalid_cdb_field;
706d5860 3084
c66ac9db
NB		 3085 break;
3086 default:
6708bb27 3087 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 3088 " 0x%04x not supported\n", service_action);
3089 goto out_unsupported_cdb;
3090 }
3091 break;
e434f1f1 3092 case MAINTENANCE_IN:
e3d6f909 3093 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3094 /* MAINTENANCE_IN from SCC-2 */
3095 /*
3096 * Check for emulated MI_REPORT_TARGET_PGS.
3097 */
3098 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3099 cmd->transport_emulate_cdb =
e3d6f909 3100 (su_dev->t10_alua.alua_type ==
c66ac9db 3101 SPC3_ALUA_EMULATED) ?
e3d6f909 3102 core_emulate_report_target_port_groups :
c66ac9db
NB		 3103 NULL;
3104 }
3105 size = (cdb[6] << 24) | (cdb[7] << 16) |
3106 (cdb[8] << 8) | cdb[9];
3107 } else {
3108 /* GPCMD_SEND_KEY from multi media commands */
3109 size = (cdb[8] << 8) + cdb[9];
3110 }
05d1c7c0 3111 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3112 break;
3113 case MODE_SELECT:
3114 size = cdb[4];
3115 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3116 break;
3117 case MODE_SELECT_10:
3118 size = (cdb[7] << 8) + cdb[8];
3119 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3120 break;
3121 case MODE_SENSE:
3122 size = cdb[4];
05d1c7c0 3123 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3124 break;
3125 case MODE_SENSE_10:
3126 case GPCMD_READ_BUFFER_CAPACITY:
3127 case GPCMD_SEND_OPC:
3128 case LOG_SELECT:
3129 case LOG_SENSE:
3130 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3131 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3132 break;
3133 case READ_BLOCK_LIMITS:
3134 size = READ_BLOCK_LEN;
05d1c7c0 3135 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3136 break;
3137 case GPCMD_GET_CONFIGURATION:
3138 case GPCMD_READ_FORMAT_CAPACITIES:
3139 case GPCMD_READ_DISC_INFO:
3140 case GPCMD_READ_TRACK_RZONE_INFO:
3141 size = (cdb[7] << 8) + cdb[8];
3142 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3143 break;
3144 case PERSISTENT_RESERVE_IN:
3145 case PERSISTENT_RESERVE_OUT:
3146 cmd->transport_emulate_cdb =
e3d6f909 3147 (su_dev->t10_pr.res_type ==
c66ac9db 3148 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3149 core_scsi3_emulate_pr : NULL;
c66ac9db 3150 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3151 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3152 break;
3153 case GPCMD_MECHANISM_STATUS:
3154 case GPCMD_READ_DVD_STRUCTURE:
3155 size = (cdb[8] << 8) + cdb[9];
3156 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3157 break;
3158 case READ_POSITION:
3159 size = READ_POSITION_LEN;
05d1c7c0 3160 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3161 break;
e434f1f1 3162 case MAINTENANCE_OUT:
e3d6f909 3163 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3164 /* MAINTENANCE_OUT from SCC-2
3165 *
3166 * Check for emulated MO_SET_TARGET_PGS.
3167 */
3168 if (cdb[1] == MO_SET_TARGET_PGS) {
3169 cmd->transport_emulate_cdb =
e3d6f909 3170 (su_dev->t10_alua.alua_type ==
c66ac9db 3171 SPC3_ALUA_EMULATED) ?
e3d6f909 3172 core_emulate_set_target_port_groups :
c66ac9db
NB		 3173 NULL;
3174 }
3175
3176 size = (cdb[6] << 24) | (cdb[7] << 16) |
3177 (cdb[8] << 8) | cdb[9];
3178 } else {
3179 /* GPCMD_REPORT_KEY from multi media commands */
3180 size = (cdb[8] << 8) + cdb[9];
3181 }
05d1c7c0 3182 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3183 break;
3184 case INQUIRY:
3185 size = (cdb[3] << 8) + cdb[4];
3186 /*
3187 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3188 * See spc4r17 section 5.3
3189 */
5951146d 3190 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3191 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3192 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3193 break;
3194 case READ_BUFFER:
3195 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3196 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3197 break;
3198 case READ_CAPACITY:
3199 size = READ_CAP_LEN;
05d1c7c0 3200 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3201 break;
3202 case READ_MEDIA_SERIAL_NUMBER:
3203 case SECURITY_PROTOCOL_IN:
3204 case SECURITY_PROTOCOL_OUT:
3205 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3206 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3207 break;
3208 case SERVICE_ACTION_IN:
3209 case ACCESS_CONTROL_IN:
3210 case ACCESS_CONTROL_OUT:
3211 case EXTENDED_COPY:
3212 case READ_ATTRIBUTE:
3213 case RECEIVE_COPY_RESULTS:
3214 case WRITE_ATTRIBUTE:
3215 size = (cdb[10] << 24) | (cdb[11] << 16) |
3216 (cdb[12] << 8) | cdb[13];
05d1c7c0 3217 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3218 break;
3219 case RECEIVE_DIAGNOSTIC:
3220 case SEND_DIAGNOSTIC:
3221 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3222 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3223 break;
3224/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3225#if 0
3226 case GPCMD_READ_CD:
3227 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3228 size = (2336 * sectors);
05d1c7c0 3229 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3230 break;
3231#endif
3232 case READ_TOC:
3233 size = cdb[8];
05d1c7c0 3234 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3235 break;
3236 case REQUEST_SENSE:
3237 size = cdb[4];
05d1c7c0 3238 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3239 break;
3240 case READ_ELEMENT_STATUS:
3241 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3242 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3243 break;
3244 case WRITE_BUFFER:
3245 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3246 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3247 break;
3248 case RESERVE:
3249 case RESERVE_10:
3250 /*
3251 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3252 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3253 */
3254 if (cdb[0] == RESERVE_10)
3255 size = (cdb[7] << 8) | cdb[8];
3256 else
3257 size = cmd->data_length;
3258
3259 /*
3260 * Setup the legacy emulated handler for SPC-2 and
3261 * >= SPC-3 compatible reservation handling (CRH=1)
3262 * Otherwise, we assume the underlying SCSI logic is
3263 * is running in SPC_PASSTHROUGH, and wants reservations
3264 * emulation disabled.
3265 */
3266 cmd->transport_emulate_cdb =
e3d6f909 3267 (su_dev->t10_pr.res_type !=
c66ac9db 3268 SPC_PASSTHROUGH) ?
e3d6f909 3269 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3270 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3271 break;
3272 case RELEASE:
3273 case RELEASE_10:
3274 /*
3275 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3276 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3277 */
3278 if (cdb[0] == RELEASE_10)
3279 size = (cdb[7] << 8) | cdb[8];
3280 else
3281 size = cmd->data_length;
3282
3283 cmd->transport_emulate_cdb =
e3d6f909 3284 (su_dev->t10_pr.res_type !=
c66ac9db 3285 SPC_PASSTHROUGH) ?
e3d6f909 3286 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3287 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3288 break;
3289 case SYNCHRONIZE_CACHE:
3290 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3291 /*
3292 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3293 */
3294 if (cdb[0] == SYNCHRONIZE_CACHE) {
3295 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3296 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3297 } else {
3298 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3299 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3300 }
3301 if (sector_ret)
3302 goto out_unsupported_cdb;
3303
3304 size = transport_get_size(sectors, cdb, cmd);
3305 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3306
3307 /*
3308 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3309 */
e3d6f909 3310 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3311 break;
3312 /*
3313 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3314 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3315 */
3316 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3317 /*
3318 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3319 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3320 */
7abbe7f3
NB		 3321 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3322 if (transport_cmd_get_valid_sectors(cmd) < 0)
3323 goto out_invalid_cdb_field;
3324 }
c66ac9db
NB		 3325 break;
3326 case UNMAP:
3327 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3328 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3329 break;
3330 case WRITE_SAME_16:
3331 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3332 if (sector_ret)
3333 goto out_unsupported_cdb;
dd3a5ad8 3334
6708bb27 3335 if (sectors)
12850626 3336 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3337 else {
3338 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3339 goto out_invalid_cdb_field;
3340 }
dd3a5ad8 3341
5db0753b 3342 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3343 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3344
3345 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3346 goto out_invalid_cdb_field;
3347 break;
3348 case WRITE_SAME:
3349 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3350 if (sector_ret)
3351 goto out_unsupported_cdb;
3352
3353 if (sectors)
12850626 3354 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3355 else {
3356 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3357 goto out_invalid_cdb_field;
c66ac9db 3358 }
706d5860
NB		 3359
3360 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3361 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3362 /*
3363 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3364 * of byte 1 bit 3 UNMAP instead of original reserved field
3365 */
3366 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3367 goto out_invalid_cdb_field;
c66ac9db
NB		 3368 break;
3369 case ALLOW_MEDIUM_REMOVAL:
3370 case GPCMD_CLOSE_TRACK:
3371 case ERASE:
3372 case INITIALIZE_ELEMENT_STATUS:
3373 case GPCMD_LOAD_UNLOAD:
3374 case REZERO_UNIT:
3375 case SEEK_10:
3376 case GPCMD_SET_SPEED:
3377 case SPACE:
3378 case START_STOP:
3379 case TEST_UNIT_READY:
3380 case VERIFY:
3381 case WRITE_FILEMARKS:
3382 case MOVE_MEDIUM:
3383 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3384 break;
3385 case REPORT_LUNS:
3386 cmd->transport_emulate_cdb =
e3d6f909 3387 transport_core_report_lun_response;
c66ac9db
NB		 3388 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3389 /*
3390 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3391 * See spc4r17 section 5.3
3392 */
5951146d 3393 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3394 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3395 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3396 break;
3397 default:
6708bb27 3398 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3399 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3400 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3401 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3402 goto out_unsupported_cdb;
3403 }
3404
3405 if (size != cmd->data_length) {
6708bb27 3406 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3407 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3408 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3409 cmd->data_length, size, cdb[0]);
3410
3411 cmd->cmd_spdtl = size;
3412
3413 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3414 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3415 " WRITE data\n");
3416 goto out_invalid_cdb_field;
3417 }
3418 /*
3419 * Reject READ_* or WRITE_* with overflow/underflow for
3420 * type SCF_SCSI_DATA_SG_IO_CDB.
3421 */
6708bb27
AG		 3422 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3423 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3424 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3425 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3426 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3427 goto out_invalid_cdb_field;
3428 }
3429
3430 if (size > cmd->data_length) {
3431 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3432 cmd->residual_count = (size - cmd->data_length);
3433 } else {
3434 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3435 cmd->residual_count = (cmd->data_length - size);
3436 }
3437 cmd->data_length = size;
3438 }
3439
d0229ae3
AG		 3440 /* Let's limit control cdbs to a page, for simplicity's sake. */
3441 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3442 size > PAGE_SIZE)
3443 goto out_invalid_cdb_field;
3444
c66ac9db
NB		 3445 transport_set_supported_SAM_opcode(cmd);
3446 return ret;
3447
3448out_unsupported_cdb:
3449 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3450 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3451 return -EINVAL;
c66ac9db
NB		 3452out_invalid_cdb_field:
3453 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3454 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3455 return -EINVAL;
c66ac9db
NB		 3456}
3457
c66ac9db
NB		 3458/*
3459 * Called from transport_generic_complete_ok() and
3460 * transport_generic_request_failure() to determine which dormant/delayed
3461 * and ordered cmds need to have their tasks added to the execution queue.
3462 */
3463static void transport_complete_task_attr(struct se_cmd *cmd)
3464{
5951146d 3465 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3466 struct se_cmd *cmd_p, *cmd_tmp;
3467 int new_active_tasks = 0;
3468
e66ecd50 3469 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3470 atomic_dec(&dev->simple_cmds);
3471 smp_mb__after_atomic_dec();
3472 dev->dev_cur_ordered_id++;
6708bb27 3473 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3474 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3475 cmd->se_ordered_id);
e66ecd50 3476 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3477 atomic_dec(&dev->dev_hoq_count);
3478 smp_mb__after_atomic_dec();
3479 dev->dev_cur_ordered_id++;
6708bb27 3480 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3481 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3482 cmd->se_ordered_id);
e66ecd50 3483 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3484 spin_lock(&dev->ordered_cmd_lock);
5951146d 3485 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3486 atomic_dec(&dev->dev_ordered_sync);
3487 smp_mb__after_atomic_dec();
3488 spin_unlock(&dev->ordered_cmd_lock);
3489
3490 dev->dev_cur_ordered_id++;
6708bb27 3491 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3492 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3493 }
3494 /*
3495 * Process all commands up to the last received
3496 * ORDERED task attribute which requires another blocking
3497 * boundary
3498 */
3499 spin_lock(&dev->delayed_cmd_lock);
3500 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3501 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3502
5951146d 3503 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3504 spin_unlock(&dev->delayed_cmd_lock);
3505
6708bb27 3506 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3507 " cmd_p: 0x%02x Task Attr: 0x%02x"
3508 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3509 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3510 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3511
3512 transport_add_tasks_from_cmd(cmd_p);
3513 new_active_tasks++;
3514
3515 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3516 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3517 break;
3518 }
3519 spin_unlock(&dev->delayed_cmd_lock);
3520 /*
3521 * If new tasks have become active, wake up the transport thread
3522 * to do the processing of the Active tasks.
3523 */
3524 if (new_active_tasks != 0)
e3d6f909 3525 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3526}
3527
07bde79a
NB		 3528static int transport_complete_qf(struct se_cmd *cmd)
3529{
3530 int ret = 0;
3531
3532 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3533 return cmd->se_tfo->queue_status(cmd);
3534
3535 switch (cmd->data_direction) {
3536 case DMA_FROM_DEVICE:
3537 ret = cmd->se_tfo->queue_data_in(cmd);
3538 break;
3539 case DMA_TO_DEVICE:
ec98f782 3540 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3541 ret = cmd->se_tfo->queue_data_in(cmd);
3542 if (ret < 0)
3543 return ret;
3544 }
3545 /* Fall through for DMA_TO_DEVICE */
3546 case DMA_NONE:
3547 ret = cmd->se_tfo->queue_status(cmd);
3548 break;
3549 default:
3550 break;
3551 }
3552
3553 return ret;
3554}
3555
3556static void transport_handle_queue_full(
3557 struct se_cmd *cmd,
3558 struct se_device *dev,
3559 int (*qf_callback)(struct se_cmd *))
3560{
3561 spin_lock_irq(&dev->qf_cmd_lock);
3562 cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3563 cmd->transport_qf_callback = qf_callback;
3564 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3565 atomic_inc(&dev->dev_qf_count);
3566 smp_mb__after_atomic_inc();
3567 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3568
3569 schedule_work(&cmd->se_dev->qf_work_queue);
3570}
3571
c66ac9db
NB		 3572static void transport_generic_complete_ok(struct se_cmd *cmd)
3573{
07bde79a 3574 int reason = 0, ret;
c66ac9db
NB		 3575 /*
3576 * Check if we need to move delayed/dormant tasks from cmds on the
3577 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3578 * Attribute.
3579 */
5951146d 3580 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3581 transport_complete_task_attr(cmd);
07bde79a
NB		 3582 /*
3583 * Check to schedule QUEUE_FULL work, or execute an existing
3584 * cmd->transport_qf_callback()
3585 */
3586 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3587 schedule_work(&cmd->se_dev->qf_work_queue);
3588
3589 if (cmd->transport_qf_callback) {
3590 ret = cmd->transport_qf_callback(cmd);
3591 if (ret < 0)
3592 goto queue_full;
3593
3594 cmd->transport_qf_callback = NULL;
3595 goto done;
3596 }
c66ac9db
NB		 3597 /*
3598 * Check if we need to retrieve a sense buffer from
3599 * the struct se_cmd in question.
3600 */
3601 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3602 if (transport_get_sense_data(cmd) < 0)
3603 reason = TCM_NON_EXISTENT_LUN;
3604
3605 /*
3606 * Only set when an struct se_task->task_scsi_status returned
3607 * a non GOOD status.
3608 */
3609 if (cmd->scsi_status) {
07bde79a 3610 ret = transport_send_check_condition_and_sense(
c66ac9db 3611 cmd, reason, 1);
07bde79a
NB		 3612 if (ret == -EAGAIN)
3613 goto queue_full;
3614
c66ac9db
NB		 3615 transport_lun_remove_cmd(cmd);
3616 transport_cmd_check_stop_to_fabric(cmd);
3617 return;
3618 }
3619 }
3620 /*
25985edc 3621 * Check for a callback, used by amongst other things
c66ac9db
NB		 3622 * XDWRITE_READ_10 emulation.
3623 */
3624 if (cmd->transport_complete_callback)
3625 cmd->transport_complete_callback(cmd);
3626
3627 switch (cmd->data_direction) {
3628 case DMA_FROM_DEVICE:
3629 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3630 if (cmd->se_lun->lun_sep) {
3631 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3632 cmd->data_length;
3633 }
3634 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3635
07bde79a
NB		 3636 ret = cmd->se_tfo->queue_data_in(cmd);
3637 if (ret == -EAGAIN)
3638 goto queue_full;
c66ac9db
NB		 3639 break;
3640 case DMA_TO_DEVICE:
3641 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3642 if (cmd->se_lun->lun_sep) {
3643 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3644 cmd->data_length;
3645 }
3646 spin_unlock(&cmd->se_lun->lun_sep_lock);
3647 /*
3648 * Check if we need to send READ payload for BIDI-COMMAND
3649 */
ec98f782 3650 if (cmd->t_bidi_data_sg) {
c66ac9db 3651 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3652 if (cmd->se_lun->lun_sep) {
3653 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3654 cmd->data_length;
3655 }
3656 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3657 ret = cmd->se_tfo->queue_data_in(cmd);
3658 if (ret == -EAGAIN)
3659 goto queue_full;
c66ac9db
NB		 3660 break;
3661 }
3662 /* Fall through for DMA_TO_DEVICE */
3663 case DMA_NONE:
07bde79a
NB		 3664 ret = cmd->se_tfo->queue_status(cmd);
3665 if (ret == -EAGAIN)
3666 goto queue_full;
c66ac9db
NB		 3667 break;
3668 default:
3669 break;
3670 }
3671
07bde79a 3672done:
c66ac9db
NB		 3673 transport_lun_remove_cmd(cmd);
3674 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3675 return;
3676
3677queue_full:
6708bb27 3678 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a
NB		 3679 " data_direction: %d\n", cmd, cmd->data_direction);
3680 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 3681}
3682
3683static void transport_free_dev_tasks(struct se_cmd *cmd)
3684{
3685 struct se_task *task, *task_tmp;
3686 unsigned long flags;
3687
a1d8b49a 3688 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3689 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3690 &cmd->t_task_list, t_list) {
c66ac9db
NB		 3691 if (atomic_read(&task->task_active))
3692 continue;
3693
3694 kfree(task->task_sg_bidi);
3695 kfree(task->task_sg);
3696
3697 list_del(&task->t_list);
3698
a1d8b49a 3699 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3700 if (task->se_dev)
e3d6f909 3701 task->se_dev->transport->free_task(task);
c66ac9db 3702 else
6708bb27 3703 pr_err("task[%u] - task->se_dev is NULL\n",
c66ac9db 3704 task->task_no);
a1d8b49a 3705 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3706 }
a1d8b49a 3707 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3708}
3709
6708bb27 3710static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3711{
ec98f782 3712 struct scatterlist *sg;
ec98f782 3713 int count;
c66ac9db 3714
6708bb27
AG		 3715 for_each_sg(sgl, sg, nents, count)
3716 __free_page(sg_page(sg));
c66ac9db 3717
6708bb27
AG		 3718 kfree(sgl);
3719}
c66ac9db 3720
6708bb27
AG		 3721static inline void transport_free_pages(struct se_cmd *cmd)
3722{
3723 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3724 return;
3725
3726 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3727 cmd->t_data_sg = NULL;
3728 cmd->t_data_nents = 0;
c66ac9db 3729
6708bb27 3730 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3731 cmd->t_bidi_data_sg = NULL;
3732 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3733}
3734
d3df7825
CH		 3735/**
3736 * transport_put_cmd - release a reference to a command
3737 * @cmd: command to release
3738 *
3739 * This routine releases our reference to the command and frees it if possible.
3740 */
3741static bool transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3742{
3743 unsigned long flags;
4911e3cc 3744 int free_tasks = 0;
c66ac9db 3745
a1d8b49a 3746 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3747 if (atomic_read(&cmd->t_fe_count)) {
3748 if (!atomic_dec_and_test(&cmd->t_fe_count))
3749 goto out_busy;
3750 }
3751
3752 if (atomic_read(&cmd->t_se_count)) {
3753 if (!atomic_dec_and_test(&cmd->t_se_count))
3754 goto out_busy;
3755 }
3756
3757 if (atomic_read(&cmd->transport_dev_active)) {
3758 atomic_set(&cmd->transport_dev_active, 0);
3759 transport_all_task_dev_remove_state(cmd);
3760 free_tasks = 1;
c66ac9db 3761 }
a1d8b49a 3762 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3763
4911e3cc
CH		 3764 if (free_tasks != 0)
3765 transport_free_dev_tasks(cmd);
d3df7825 3766
c66ac9db 3767 transport_free_pages(cmd);
31afc39c 3768 transport_release_cmd(cmd);
d3df7825 3769 return true;
4911e3cc
CH		 3770out_busy:
3771 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3772 return false;
c66ac9db
NB		 3773}
3774
35462975
CH		 3775static int
3776transport_generic_remove(struct se_cmd *cmd, int session_reinstatement)
c66ac9db
NB		 3777{
3778 unsigned long flags;
3779
d3df7825 3780 if (!transport_put_cmd(cmd)) {
c66ac9db 3781 if (session_reinstatement) {
a1d8b49a 3782 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3783 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3784 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3785 flags);
3786 }
3787 return 1;
3788 }
3789
c66ac9db
NB		 3790 return 0;
3791}
3792
3793/*
ec98f782
AG		 3794 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3795 * allocating in the core.
c66ac9db
NB		 3796 * @cmd: Associated se_cmd descriptor
3797 * @mem: SGL style memory for TCM WRITE / READ
3798 * @sg_mem_num: Number of SGL elements
3799 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3800 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3801 *
3802 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3803 * of parameters.
3804 */
3805int transport_generic_map_mem_to_cmd(
3806 struct se_cmd *cmd,
5951146d
AG		 3807 struct scatterlist *sgl,
3808 u32 sgl_count,
3809 struct scatterlist *sgl_bidi,
3810 u32 sgl_bidi_count)
c66ac9db 3811{
5951146d 3812 if (!sgl || !sgl_count)
c66ac9db 3813 return 0;
c66ac9db 3814
c66ac9db
NB		 3815 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3816 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3817
ec98f782
AG		 3818 cmd->t_data_sg = sgl;
3819 cmd->t_data_nents = sgl_count;
c66ac9db 3820
ec98f782
AG		 3821 if (sgl_bidi && sgl_bidi_count) {
3822 cmd->t_bidi_data_sg = sgl_bidi;
3823 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3824 }
3825 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3826 }
3827
3828 return 0;
3829}
3830EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3831
c66ac9db
NB		 3832static int transport_new_cmd_obj(struct se_cmd *cmd)
3833{
5951146d 3834 struct se_device *dev = cmd->se_dev;
01cde4d5 3835 int set_counts = 1, rc, task_cdbs;
c66ac9db 3836
ec98f782
AG		 3837 /*
3838 * Setup any BIDI READ tasks and memory from
3839 * cmd->t_mem_bidi_list so the READ struct se_tasks
3840 * are queued first for the non pSCSI passthrough case.
3841 */
3842 if (cmd->t_bidi_data_sg &&
3843 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3844 rc = transport_allocate_tasks(cmd,
3845 cmd->t_task_lba,
3846 DMA_FROM_DEVICE,
3847 cmd->t_bidi_data_sg,
3848 cmd->t_bidi_data_nents);
6708bb27 3849 if (rc <= 0) {
c66ac9db
NB		 3850 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3851 cmd->scsi_sense_reason =
ec98f782 3852 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3853 return -EINVAL;
c66ac9db 3854 }
ec98f782
AG		 3855 atomic_inc(&cmd->t_fe_count);
3856 atomic_inc(&cmd->t_se_count);
3857 set_counts = 0;
3858 }
3859 /*
3860 * Setup the tasks and memory from cmd->t_mem_list
3861 * Note for BIDI transfers this will contain the WRITE payload
3862 */
3863 task_cdbs = transport_allocate_tasks(cmd,
3864 cmd->t_task_lba,
3865 cmd->data_direction,
3866 cmd->t_data_sg,
3867 cmd->t_data_nents);
6708bb27 3868 if (task_cdbs <= 0) {
ec98f782
AG		 3869 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3870 cmd->scsi_sense_reason =
3871 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3872 return -EINVAL;
ec98f782 3873 }
c66ac9db 3874
ec98f782
AG		 3875 if (set_counts) {
3876 atomic_inc(&cmd->t_fe_count);
3877 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3878 }
3879
ec98f782
AG		 3880 cmd->t_task_list_num = task_cdbs;
3881
a1d8b49a
AG		 3882 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3883 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3884 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3885 return 0;
3886}
3887
05d1c7c0
AG		 3888void *transport_kmap_first_data_page(struct se_cmd *cmd)
3889{
ec98f782 3890 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3891
ec98f782 3892 BUG_ON(!sg);
05d1c7c0 3893 /*
ec98f782
AG		 3894 * We need to take into account a possible offset here for fabrics like
3895 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3896 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3897 */
ec98f782 3898 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3899}
3900EXPORT_SYMBOL(transport_kmap_first_data_page);
3901
3902void transport_kunmap_first_data_page(struct se_cmd *cmd)
3903{
ec98f782 3904 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3905}
3906EXPORT_SYMBOL(transport_kunmap_first_data_page);
3907
c66ac9db 3908static int
05d1c7c0 3909transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3910{
ec98f782
AG		 3911 u32 length = cmd->data_length;
3912 unsigned int nents;
3913 struct page *page;
3914 int i = 0;
c66ac9db 3915
ec98f782
AG		 3916 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3917 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3918 if (!cmd->t_data_sg)
3919 return -ENOMEM;
c66ac9db 3920
ec98f782
AG		 3921 cmd->t_data_nents = nents;
3922 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3923
ec98f782
AG		 3924 while (length) {
3925 u32 page_len = min_t(u32, length, PAGE_SIZE);
3926 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3927 if (!page)
3928 goto out;
c66ac9db 3929
ec98f782
AG		 3930 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3931 length -= page_len;
3932 i++;
c66ac9db 3933 }
c66ac9db 3934 return 0;
c66ac9db 3935
ec98f782
AG		 3936out:
3937 while (i >= 0) {
3938 __free_page(sg_page(&cmd->t_data_sg[i]));
3939 i--;
c66ac9db 3940 }
ec98f782
AG		 3941 kfree(cmd->t_data_sg);
3942 cmd->t_data_sg = NULL;
3943 return -ENOMEM;
c66ac9db
NB		 3944}
3945
a1d8b49a
AG		 3946/* Reduce sectors if they are too long for the device */
3947static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3948 struct se_device *dev,
3949 unsigned long long lba,
a1d8b49a 3950 sector_t sectors)
c66ac9db 3951{
a1d8b49a 3952 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3953
a1d8b49a
AG		 3954 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3955 if ((lba + sectors) > transport_dev_end_lba(dev))
3956 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3957
a1d8b49a 3958 return sectors;
c66ac9db
NB		 3959}
3960
c66ac9db
NB		 3961
3962/*
3963 * This function can be used by HW target mode drivers to create a linked
3964 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3965 * This is intended to be called during the completion path by TCM Core
3966 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3967 */
3968void transport_do_task_sg_chain(struct se_cmd *cmd)
3969{
ec98f782
AG		 3970 struct scatterlist *sg_first = NULL;
3971 struct scatterlist *sg_prev = NULL;
3972 int sg_prev_nents = 0;
3973 struct scatterlist *sg;
c66ac9db 3974 struct se_task *task;
ec98f782 3975 u32 chained_nents = 0;
c66ac9db
NB		 3976 int i;
3977
ec98f782
AG		 3978 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3979
c66ac9db
NB		 3980 /*
3981 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3982 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3983 */
a1d8b49a 3984 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3985 if (!task->task_sg)
c66ac9db
NB		 3986 continue;
3987
ec98f782
AG		 3988 if (!sg_first) {
3989 sg_first = task->task_sg;
6708bb27 3990 chained_nents = task->task_sg_nents;
97868c89 3991 } else {
ec98f782 3992 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3993 chained_nents += task->task_sg_nents;
97868c89 3994 }
c3c74c7a
NB		 3995 /*
3996 * For the padded tasks, use the extra SGL vector allocated
3997 * in transport_allocate_data_tasks() for the sg_prev_nents
3998 * offset into sg_chain() above.. The last task of a
3999 * multi-task list, or a single task will not have
4000 * task->task_sg_padded set..
4001 */
4002 if (task->task_padded_sg)
4003 sg_prev_nents = (task->task_sg_nents + 1);
4004 else
4005 sg_prev_nents = task->task_sg_nents;
ec98f782
AG		 4006
4007 sg_prev = task->task_sg;
c66ac9db
NB		 4008 }
4009 /*
4010 * Setup the starting pointer and total t_tasks_sg_linked_no including
4011 * padding SGs for linking and to mark the end.
4012 */
a1d8b49a 4013 cmd->t_tasks_sg_chained = sg_first;
ec98f782 4014 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 4015
6708bb27 4016 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 4017 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4018 cmd->t_tasks_sg_chained_no);
c66ac9db 4019
a1d8b49a
AG		 4020 for_each_sg(cmd->t_tasks_sg_chained, sg,
4021 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 4022
6708bb27 4023 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 4024 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 4025 if (sg_is_chain(sg))
6708bb27 4026 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 4027 if (sg_is_last(sg))
6708bb27 4028 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 4029 }
c66ac9db
NB		 4030}
4031EXPORT_SYMBOL(transport_do_task_sg_chain);
4032
a1d8b49a
AG		 4033/*
4034 * Break up cmd into chunks transport can handle
4035 */
ec98f782 4036static int transport_allocate_data_tasks(
c66ac9db
NB		 4037 struct se_cmd *cmd,
4038 unsigned long long lba,
c66ac9db 4039 enum dma_data_direction data_direction,
ec98f782
AG		 4040 struct scatterlist *sgl,
4041 unsigned int sgl_nents)
c66ac9db
NB		 4042{
4043 unsigned char *cdb = NULL;
4044 struct se_task *task;
5951146d 4045 struct se_device *dev = cmd->se_dev;
ec98f782 4046 unsigned long flags;
1d20bb61 4047 int task_count, i, ret;
277c5f27 4048 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 4049 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
4050 struct scatterlist *sg;
4051 struct scatterlist *cmd_sg;
a1d8b49a 4052
ec98f782
AG		 4053 WARN_ON(cmd->data_length % sector_size);
4054 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 4055 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
4056
ec98f782
AG		 4057 cmd_sg = sgl;
4058 for (i = 0; i < task_count; i++) {
c3c74c7a 4059 unsigned int task_size, task_sg_nents_padded;
ec98f782 4060 int count;
a1d8b49a 4061
c66ac9db 4062 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 4063 if (!task)
ec98f782 4064 return -ENOMEM;
c66ac9db 4065
c66ac9db 4066 task->task_lba = lba;
ec98f782
AG		 4067 task->task_sectors = min(sectors, dev_max_sectors);
4068 task->task_size = task->task_sectors * sector_size;
c66ac9db 4069
e3d6f909 4070 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4071 BUG_ON(!cdb);
4072
4073 memcpy(cdb, cmd->t_task_cdb,
4074 scsi_command_size(cmd->t_task_cdb));
4075
4076 /* Update new cdb with updated lba/sectors */
3a867205 4077 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
525a48a2
NB		 4078 /*
4079 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
4080 * in order to calculate the number per task SGL entries
4081 */
4082 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 4083 /*
ec98f782
AG		 4084 * Check if the fabric module driver is requesting that all
4085 * struct se_task->task_sg[] be chained together.. If so,
4086 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 4087 * marking the end of the chained SGL for every task except
4088 * the last one for (task_count > 1) operation, or skipping
4089 * the extra padding for the (task_count == 1) case.
c66ac9db 4090 */
c3c74c7a
NB		 4091 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
4092 task_sg_nents_padded = (task->task_sg_nents + 1);
ec98f782 4093 task->task_padded_sg = 1;
c3c74c7a
NB		 4094 } else
4095 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 4096
1d20bb61 4097 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 4098 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 4099 if (!task->task_sg) {
4100 cmd->se_dev->transport->free_task(task);
4101 return -ENOMEM;
4102 }
4103
c3c74c7a 4104 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 4105
ec98f782
AG		 4106 task_size = task->task_size;
4107
4108 /* Build new sgl, only up to task_size */
6708bb27 4109 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 4110 if (cmd_sg->length > task_size)
4111 break;
4112
4113 *sg = *cmd_sg;
4114 task_size -= cmd_sg->length;
4115 cmd_sg = sg_next(cmd_sg);
c66ac9db 4116 }
c66ac9db 4117
ec98f782
AG		 4118 lba += task->task_sectors;
4119 sectors -= task->task_sectors;
c66ac9db 4120
ec98f782
AG		 4121 spin_lock_irqsave(&cmd->t_state_lock, flags);
4122 list_add_tail(&task->t_list, &cmd->t_task_list);
4123 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4124 }
1d20bb61
NB		 4125 /*
4126 * Now perform the memory map of task->task_sg[] into backend
4127 * subsystem memory..
4128 */
4129 list_for_each_entry(task, &cmd->t_task_list, t_list) {
4130 if (atomic_read(&task->task_sent))
4131 continue;
4132 if (!dev->transport->map_data_SG)
4133 continue;
4134
4135 ret = dev->transport->map_data_SG(task);
4136 if (ret < 0)
4137 return 0;
4138 }
c66ac9db 4139
ec98f782 4140 return task_count;
c66ac9db
NB		 4141}
4142
4143static int
ec98f782 4144transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 4145{
5951146d 4146 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4147 unsigned char *cdb;
4148 struct se_task *task;
ec98f782 4149 unsigned long flags;
6708bb27 4150 int ret = 0;
c66ac9db
NB		 4151
4152 task = transport_generic_get_task(cmd, cmd->data_direction);
4153 if (!task)
ec98f782 4154 return -ENOMEM;
c66ac9db 4155
e3d6f909 4156 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4157 BUG_ON(!cdb);
4158 memcpy(cdb, cmd->t_task_cdb,
4159 scsi_command_size(cmd->t_task_cdb));
c66ac9db 4160
ec98f782
AG		 4161 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4162 GFP_KERNEL);
4163 if (!task->task_sg) {
4164 cmd->se_dev->transport->free_task(task);
4165 return -ENOMEM;
4166 }
4167
4168 memcpy(task->task_sg, cmd->t_data_sg,
4169 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 4170 task->task_size = cmd->data_length;
6708bb27 4171 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 4172
ec98f782
AG		 4173 spin_lock_irqsave(&cmd->t_state_lock, flags);
4174 list_add_tail(&task->t_list, &cmd->t_task_list);
4175 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4176
4177 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
1d20bb61
NB		 4178 if (dev->transport->map_control_SG)
4179 ret = dev->transport->map_control_SG(task);
c66ac9db
NB		 4180 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4181 if (dev->transport->cdb_none)
6708bb27 4182 ret = dev->transport->cdb_none(task);
c66ac9db 4183 } else {
6708bb27 4184 pr_err("target: Unknown control cmd type!\n");
c66ac9db 4185 BUG();
ec98f782 4186 }
6708bb27
AG		 4187
4188 /* Success! Return number of tasks allocated */
4189 if (ret == 0)
4190 return 1;
4191 return ret;
ec98f782
AG		 4192}
4193
4194static u32 transport_allocate_tasks(
4195 struct se_cmd *cmd,
4196 unsigned long long lba,
4197 enum dma_data_direction data_direction,
4198 struct scatterlist *sgl,
4199 unsigned int sgl_nents)
4200{
01cde4d5
NB		 4201 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4202 if (transport_cmd_get_valid_sectors(cmd) < 0)
4203 return -EINVAL;
4204
ec98f782
AG		 4205 return transport_allocate_data_tasks(cmd, lba, data_direction,
4206 sgl, sgl_nents);
01cde4d5 4207 } else
6708bb27
AG		 4208 return transport_allocate_control_task(cmd);
4209
c66ac9db
NB		 4210}
4211
ec98f782 4212
c66ac9db
NB		 4213/* transport_generic_new_cmd(): Called from transport_processing_thread()
4214 *
4215 * Allocate storage transport resources from a set of values predefined
4216 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4217 * Any non zero return here is treated as an "out of resource' op here.
4218 */
4219 /*
4220 * Generate struct se_task(s) and/or their payloads for this CDB.
4221 */
a1d8b49a 4222int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4223{
c66ac9db
NB		 4224 int ret = 0;
4225
4226 /*
4227 * Determine is the TCM fabric module has already allocated physical
4228 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4229 * beforehand.
c66ac9db 4230 */
ec98f782
AG		 4231 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4232 cmd->data_length) {
05d1c7c0 4233 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4234 if (ret < 0)
4235 return ret;
4236 }
1d20bb61
NB		 4237 /*
4238 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4239 * control or data CDB types, and perform the map to backend subsystem
4240 * code from SGL memory allocated here by transport_generic_get_mem(), or
4241 * via pre-existing SGL memory setup explictly by fabric module code with
4242 * transport_generic_map_mem_to_cmd().
4243 */
c66ac9db
NB		 4244 ret = transport_new_cmd_obj(cmd);
4245 if (ret < 0)
4246 return ret;
c66ac9db 4247 /*
a1d8b49a 4248 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4249 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4250 * will be added to the struct se_device execution queue after its WRITE
4251 * data has arrived. (ie: It gets handled by the transport processing
4252 * thread a second time)
4253 */
4254 if (cmd->data_direction == DMA_TO_DEVICE) {
4255 transport_add_tasks_to_state_queue(cmd);
4256 return transport_generic_write_pending(cmd);
4257 }
4258 /*
4259 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4260 * to the execution queue.
4261 */
4262 transport_execute_tasks(cmd);
4263 return 0;
4264}
a1d8b49a 4265EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4266
4267/* transport_generic_process_write():
4268 *
4269 *
4270 */
4271void transport_generic_process_write(struct se_cmd *cmd)
4272{
c66ac9db
NB		 4273 transport_execute_tasks(cmd);
4274}
4275EXPORT_SYMBOL(transport_generic_process_write);
4276
07bde79a
NB		 4277static int transport_write_pending_qf(struct se_cmd *cmd)
4278{
4279 return cmd->se_tfo->write_pending(cmd);
4280}
4281
c66ac9db
NB		 4282/* transport_generic_write_pending():
4283 *
4284 *
4285 */
4286static int transport_generic_write_pending(struct se_cmd *cmd)
4287{
4288 unsigned long flags;
4289 int ret;
4290
a1d8b49a 4291 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4292 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4293 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a
NB		 4294
4295 if (cmd->transport_qf_callback) {
4296 ret = cmd->transport_qf_callback(cmd);
4297 if (ret == -EAGAIN)
4298 goto queue_full;
4299 else if (ret < 0)
4300 return ret;
4301
4302 cmd->transport_qf_callback = NULL;
4303 return 0;
4304 }
05d1c7c0 4305
c66ac9db
NB		 4306 /*
4307 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4308 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4309 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4310 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4311 * because the se_cmd->se_lun pointer is not being cleared.
4312 */
4313 transport_cmd_check_stop(cmd, 1, 0);
4314
4315 /*
4316 * Call the fabric write_pending function here to let the
4317 * frontend know that WRITE buffers are ready.
4318 */
e3d6f909 4319 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4320 if (ret == -EAGAIN)
4321 goto queue_full;
4322 else if (ret < 0)
c66ac9db
NB		 4323 return ret;
4324
4325 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4326
4327queue_full:
6708bb27 4328 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a
NB		 4329 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4330 transport_handle_queue_full(cmd, cmd->se_dev,
4331 transport_write_pending_qf);
4332 return ret;
c66ac9db
NB		 4333}
4334
2dbc43d2
CH		 4335/**
4336 * transport_release_cmd - free a command
4337 * @cmd: command to free
4338 *
4339 * This routine unconditionally frees a command, and reference counting
4340 * or list removal must be done in the caller.
4341 */
35462975 4342void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4343{
e3d6f909 4344 BUG_ON(!cmd->se_tfo);
c66ac9db 4345
2dbc43d2
CH		 4346 if (cmd->se_tmr_req)
4347 core_tmr_release_req(cmd->se_tmr_req);
4348 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4349 kfree(cmd->t_task_cdb);
35462975 4350 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4351}
35462975 4352EXPORT_SYMBOL(transport_release_cmd);
c66ac9db
NB		 4353
4354/* transport_generic_free_cmd():
4355 *
4356 * Called from processing frontend to release storage engine resources
4357 */
4358void transport_generic_free_cmd(
4359 struct se_cmd *cmd,
4360 int wait_for_tasks,
c66ac9db
NB		 4361 int session_reinstatement)
4362{
5951146d 4363 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
35462975 4364 transport_release_cmd(cmd);
c66ac9db
NB		 4365 else {
4366 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4367
e3d6f909 4368 if (cmd->se_lun) {
c66ac9db 4369#if 0
6708bb27 4370 pr_debug("cmd: %p ITT: 0x%08x contains"
e3d6f909
AG		 4371 " cmd->se_lun\n", cmd,
4372 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4373#endif
4374 transport_lun_remove_cmd(cmd);
4375 }
4376
4377 if (wait_for_tasks && cmd->transport_wait_for_tasks)
4378 cmd->transport_wait_for_tasks(cmd, 0, 0);
4379
f4366772
NB		 4380 transport_free_dev_tasks(cmd);
4381
35462975 4382 transport_generic_remove(cmd, session_reinstatement);
c66ac9db
NB		 4383 }
4384}
4385EXPORT_SYMBOL(transport_generic_free_cmd);
4386
4387static void transport_nop_wait_for_tasks(
4388 struct se_cmd *cmd,
4389 int remove_cmd,
4390 int session_reinstatement)
4391{
4392 return;
4393}
4394
4395/* transport_lun_wait_for_tasks():
4396 *
4397 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4398 * an struct se_lun to be successfully shutdown.
4399 */
4400static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4401{
4402 unsigned long flags;
4403 int ret;
4404 /*
4405 * If the frontend has already requested this struct se_cmd to
4406 * be stopped, we can safely ignore this struct se_cmd.
4407 */
a1d8b49a
AG		 4408 spin_lock_irqsave(&cmd->t_state_lock, flags);
4409 if (atomic_read(&cmd->t_transport_stop)) {
4410 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4411 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4412 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4413 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4414 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4415 return -EPERM;
c66ac9db 4416 }
a1d8b49a
AG		 4417 atomic_set(&cmd->transport_lun_fe_stop, 1);
4418 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4419
5951146d 4420 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4421
4422 ret = transport_stop_tasks_for_cmd(cmd);
4423
6708bb27
AG		 4424 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4425 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4426 if (!ret) {
6708bb27 4427 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4428 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4429 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4430 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4431 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4432 }
5951146d 4433 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4434
4435 return 0;
4436}
4437
c66ac9db
NB		 4438static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4439{
4440 struct se_cmd *cmd = NULL;
4441 unsigned long lun_flags, cmd_flags;
4442 /*
4443 * Do exception processing and return CHECK_CONDITION status to the
4444 * Initiator Port.
4445 */
4446 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4447 while (!list_empty(&lun->lun_cmd_list)) {
4448 cmd = list_first_entry(&lun->lun_cmd_list,
4449 struct se_cmd, se_lun_node);
4450 list_del(&cmd->se_lun_node);
4451
a1d8b49a 4452 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4453 /*
4454 * This will notify iscsi_target_transport.c:
4455 * transport_cmd_check_stop() that a LUN shutdown is in
4456 * progress for the iscsi_cmd_t.
4457 */
a1d8b49a 4458 spin_lock(&cmd->t_state_lock);
6708bb27 4459 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4460 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4461 cmd->se_lun->unpacked_lun,
4462 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4463 atomic_set(&cmd->transport_lun_stop, 1);
4464 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4465
4466 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4467
6708bb27
AG		 4468 if (!cmd->se_lun) {
4469 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4470 cmd->se_tfo->get_task_tag(cmd),
4471 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4472 BUG();
4473 }
4474 /*
4475 * If the Storage engine still owns the iscsi_cmd_t, determine
4476 * and/or stop its context.
4477 */
6708bb27 4478 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4479 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4480 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4481
e3d6f909 4482 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4483 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4484 continue;
4485 }
4486
6708bb27 4487 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4488 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4489 cmd->se_lun->unpacked_lun,
4490 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4491
a1d8b49a 4492 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4493 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4494 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4495 goto check_cond;
4496 }
a1d8b49a 4497 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4498 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4499 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4500
4501 transport_free_dev_tasks(cmd);
4502 /*
4503 * The Storage engine stopped this struct se_cmd before it was
4504 * send to the fabric frontend for delivery back to the
4505 * Initiator Node. Return this SCSI CDB back with an
4506 * CHECK_CONDITION status.
4507 */
4508check_cond:
4509 transport_send_check_condition_and_sense(cmd,
4510 TCM_NON_EXISTENT_LUN, 0);
4511 /*
4512 * If the fabric frontend is waiting for this iscsi_cmd_t to
4513 * be released, notify the waiting thread now that LU has
4514 * finished accessing it.
4515 */
a1d8b49a
AG		 4516 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4517 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4518 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4519 " struct se_cmd: %p ITT: 0x%08x\n",
4520 lun->unpacked_lun,
e3d6f909 4521 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4522
a1d8b49a 4523 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4524 cmd_flags);
4525 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4526 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4527 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4528 continue;
4529 }
6708bb27 4530 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4531 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4532
a1d8b49a 4533 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4534 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4535 }
4536 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4537}
4538
4539static int transport_clear_lun_thread(void *p)
4540{
4541 struct se_lun *lun = (struct se_lun *)p;
4542
4543 __transport_clear_lun_from_sessions(lun);
4544 complete(&lun->lun_shutdown_comp);
4545
4546 return 0;
4547}
4548
4549int transport_clear_lun_from_sessions(struct se_lun *lun)
4550{
4551 struct task_struct *kt;
4552
5951146d 4553 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4554 "tcm_cl_%u", lun->unpacked_lun);
4555 if (IS_ERR(kt)) {
6708bb27 4556 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4557 return PTR_ERR(kt);
c66ac9db
NB		 4558 }
4559 wait_for_completion(&lun->lun_shutdown_comp);
4560
4561 return 0;
4562}
4563
4564/* transport_generic_wait_for_tasks():
4565 *
4566 * Called from frontend or passthrough context to wait for storage engine
4567 * to pause and/or release frontend generated struct se_cmd.
4568 */
4569static void transport_generic_wait_for_tasks(
4570 struct se_cmd *cmd,
4571 int remove_cmd,
4572 int session_reinstatement)
4573{
4574 unsigned long flags;
4575
4576 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
4577 return;
4578
a1d8b49a 4579 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4580 /*
4581 * If we are already stopped due to an external event (ie: LUN shutdown)
4582 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4583 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4584 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4585 * has completed its operation on the struct se_cmd.
4586 */
a1d8b49a 4587 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4588
6708bb27 4589 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4590 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4591 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4592 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4593 /*
4594 * There is a special case for WRITES where a FE exception +
4595 * LUN shutdown means ConfigFS context is still sleeping on
4596 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4597 * We go ahead and up transport_lun_stop_comp just to be sure
4598 * here.
4599 */
a1d8b49a
AG		 4600 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4601 complete(&cmd->transport_lun_stop_comp);
4602 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4603 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4604
4605 transport_all_task_dev_remove_state(cmd);
4606 /*
4607 * At this point, the frontend who was the originator of this
4608 * struct se_cmd, now owns the structure and can be released through
4609 * normal means below.
4610 */
6708bb27 4611 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4612 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4613 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4614 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4615
a1d8b49a 4616 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4617 }
a1d8b49a
AG		 4618 if (!atomic_read(&cmd->t_transport_active) ||
4619 atomic_read(&cmd->t_transport_aborted))
c66ac9db
NB		 4620 goto remove;
4621
a1d8b49a 4622 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4623
6708bb27 4624 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4625 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4626 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4627 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4628 cmd->deferred_t_state);
4629
a1d8b49a 4630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4631
5951146d 4632 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4633
a1d8b49a 4634 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4635
a1d8b49a
AG		 4636 spin_lock_irqsave(&cmd->t_state_lock, flags);
4637 atomic_set(&cmd->t_transport_active, 0);
4638 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4639
6708bb27 4640 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4641 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4642 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4643remove:
a1d8b49a 4644 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4645 if (!remove_cmd)
4646 return;
4647
35462975 4648 transport_generic_free_cmd(cmd, 0, session_reinstatement);
c66ac9db
NB		 4649}
4650
4651static int transport_get_sense_codes(
4652 struct se_cmd *cmd,
4653 u8 *asc,
4654 u8 *ascq)
4655{
4656 *asc = cmd->scsi_asc;
4657 *ascq = cmd->scsi_ascq;
4658
4659 return 0;
4660}
4661
4662static int transport_set_sense_codes(
4663 struct se_cmd *cmd,
4664 u8 asc,
4665 u8 ascq)
4666{
4667 cmd->scsi_asc = asc;
4668 cmd->scsi_ascq = ascq;
4669
4670 return 0;
4671}
4672
4673int transport_send_check_condition_and_sense(
4674 struct se_cmd *cmd,
4675 u8 reason,
4676 int from_transport)
4677{
4678 unsigned char *buffer = cmd->sense_buffer;
4679 unsigned long flags;
4680 int offset;
4681 u8 asc = 0, ascq = 0;
4682
a1d8b49a 4683 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4684 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4685 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4686 return 0;
4687 }
4688 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4690
4691 if (!reason && from_transport)
4692 goto after_reason;
4693
4694 if (!from_transport)
4695 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4696 /*
4697 * Data Segment and SenseLength of the fabric response PDU.
4698 *
4699 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4700 * from include/scsi/scsi_cmnd.h
4701 */
e3d6f909 4702 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4703 TRANSPORT_SENSE_BUFFER);
4704 /*
4705 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4706 * SENSE KEY values from include/scsi/scsi.h
4707 */
4708 switch (reason) {
4709 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4710 /* CURRENT ERROR */
4711 buffer[offset] = 0x70;
4712 /* ILLEGAL REQUEST */
4713 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4714 /* LOGICAL UNIT NOT SUPPORTED */
4715 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4716 break;
c66ac9db
NB		 4717 case TCM_UNSUPPORTED_SCSI_OPCODE:
4718 case TCM_SECTOR_COUNT_TOO_MANY:
4719 /* CURRENT ERROR */
4720 buffer[offset] = 0x70;
4721 /* ILLEGAL REQUEST */
4722 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4723 /* INVALID COMMAND OPERATION CODE */
4724 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4725 break;
4726 case TCM_UNKNOWN_MODE_PAGE:
4727 /* CURRENT ERROR */
4728 buffer[offset] = 0x70;
4729 /* ILLEGAL REQUEST */
4730 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4731 /* INVALID FIELD IN CDB */
4732 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4733 break;
4734 case TCM_CHECK_CONDITION_ABORT_CMD:
4735 /* CURRENT ERROR */
4736 buffer[offset] = 0x70;
4737 /* ABORTED COMMAND */
4738 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4739 /* BUS DEVICE RESET FUNCTION OCCURRED */
4740 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4741 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4742 break;
4743 case TCM_INCORRECT_AMOUNT_OF_DATA:
4744 /* CURRENT ERROR */
4745 buffer[offset] = 0x70;
4746 /* ABORTED COMMAND */
4747 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4748 /* WRITE ERROR */
4749 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4750 /* NOT ENOUGH UNSOLICITED DATA */
4751 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4752 break;
4753 case TCM_INVALID_CDB_FIELD:
4754 /* CURRENT ERROR */
4755 buffer[offset] = 0x70;
4756 /* ABORTED COMMAND */
4757 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4758 /* INVALID FIELD IN CDB */
4759 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4760 break;
4761 case TCM_INVALID_PARAMETER_LIST:
4762 /* CURRENT ERROR */
4763 buffer[offset] = 0x70;
4764 /* ABORTED COMMAND */
4765 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4766 /* INVALID FIELD IN PARAMETER LIST */
4767 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4768 break;
4769 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4770 /* CURRENT ERROR */
4771 buffer[offset] = 0x70;
4772 /* ABORTED COMMAND */
4773 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4774 /* WRITE ERROR */
4775 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4776 /* UNEXPECTED_UNSOLICITED_DATA */
4777 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4778 break;
4779 case TCM_SERVICE_CRC_ERROR:
4780 /* CURRENT ERROR */
4781 buffer[offset] = 0x70;
4782 /* ABORTED COMMAND */
4783 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4784 /* PROTOCOL SERVICE CRC ERROR */
4785 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4786 /* N/A */
4787 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4788 break;
4789 case TCM_SNACK_REJECTED:
4790 /* CURRENT ERROR */
4791 buffer[offset] = 0x70;
4792 /* ABORTED COMMAND */
4793 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4794 /* READ ERROR */
4795 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4796 /* FAILED RETRANSMISSION REQUEST */
4797 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4798 break;
4799 case TCM_WRITE_PROTECTED:
4800 /* CURRENT ERROR */
4801 buffer[offset] = 0x70;
4802 /* DATA PROTECT */
4803 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4804 /* WRITE PROTECTED */
4805 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4806 break;
4807 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4808 /* CURRENT ERROR */
4809 buffer[offset] = 0x70;
4810 /* UNIT ATTENTION */
4811 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4812 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4813 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4814 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4815 break;
4816 case TCM_CHECK_CONDITION_NOT_READY:
4817 /* CURRENT ERROR */
4818 buffer[offset] = 0x70;
4819 /* Not Ready */
4820 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4821 transport_get_sense_codes(cmd, &asc, &ascq);
4822 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4823 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4824 break;
4825 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4826 default:
4827 /* CURRENT ERROR */
4828 buffer[offset] = 0x70;
4829 /* ILLEGAL REQUEST */
4830 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4831 /* LOGICAL UNIT COMMUNICATION FAILURE */
4832 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4833 break;
4834 }
4835 /*
4836 * This code uses linux/include/scsi/scsi.h SAM status codes!
4837 */
4838 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4839 /*
4840 * Automatically padded, this value is encoded in the fabric's
4841 * data_length response PDU containing the SCSI defined sense data.
4842 */
4843 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4844
4845after_reason:
07bde79a 4846 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4847}
4848EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4849
4850int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4851{
4852 int ret = 0;
4853
a1d8b49a 4854 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4855 if (!send_status ||
c66ac9db
NB		 4856 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4857 return 1;
4858#if 0
6708bb27 4859 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4860 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4861 cmd->t_task_cdb[0],
e3d6f909 4862 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4863#endif
4864 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4865 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4866 ret = 1;
4867 }
4868 return ret;
4869}
4870EXPORT_SYMBOL(transport_check_aborted_status);
4871
4872void transport_send_task_abort(struct se_cmd *cmd)
4873{
c252f003
NB		 4874 unsigned long flags;
4875
4876 spin_lock_irqsave(&cmd->t_state_lock, flags);
4877 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4878 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4879 return;
4880 }
4881 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4882
c66ac9db
NB		 4883 /*
4884 * If there are still expected incoming fabric WRITEs, we wait
4885 * until until they have completed before sending a TASK_ABORTED
4886 * response. This response with TASK_ABORTED status will be
4887 * queued back to fabric module by transport_check_aborted_status().
4888 */
4889 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4890 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4891 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4892 smp_mb__after_atomic_inc();
4893 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4894 transport_new_cmd_failure(cmd);
4895 return;
4896 }
4897 }
4898 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4899#if 0
6708bb27 4900 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4901 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4902 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4903#endif
e3d6f909 4904 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4905}
4906
4907/* transport_generic_do_tmr():
4908 *
4909 *
4910 */
4911int transport_generic_do_tmr(struct se_cmd *cmd)
4912{
5951146d 4913 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4914 struct se_tmr_req *tmr = cmd->se_tmr_req;
4915 int ret;
4916
4917 switch (tmr->function) {
5c6cd613 4918 case TMR_ABORT_TASK:
c66ac9db
NB		 4919 tmr->response = TMR_FUNCTION_REJECTED;
4920 break;
5c6cd613
NB		 4921 case TMR_ABORT_TASK_SET:
4922 case TMR_CLEAR_ACA:
4923 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4924 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4925 break;
5c6cd613 4926 case TMR_LUN_RESET:
c66ac9db
NB		 4927 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4928 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4929 TMR_FUNCTION_REJECTED;
4930 break;
5c6cd613 4931 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4932 tmr->response = TMR_FUNCTION_REJECTED;
4933 break;
5c6cd613 4934 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4935 tmr->response = TMR_FUNCTION_REJECTED;
4936 break;
c66ac9db 4937 default:
6708bb27 4938 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4939 tmr->function);
4940 tmr->response = TMR_FUNCTION_REJECTED;
4941 break;
4942 }
4943
4944 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4945 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 4946
4947 transport_cmd_check_stop(cmd, 2, 0);
4948 return 0;
4949}
4950
4951/*
4952 * Called with spin_lock_irq(&dev->execute_task_lock); held
4953 *
4954 */
4955static struct se_task *
4956transport_get_task_from_state_list(struct se_device *dev)
4957{
4958 struct se_task *task;
4959
4960 if (list_empty(&dev->state_task_list))
4961 return NULL;
4962
4963 list_for_each_entry(task, &dev->state_task_list, t_state_list)
4964 break;
4965
4966 list_del(&task->t_state_list);
4967 atomic_set(&task->task_state_active, 0);
4968
4969 return task;
4970}
4971
4972static void transport_processing_shutdown(struct se_device *dev)
4973{
4974 struct se_cmd *cmd;
c66ac9db 4975 struct se_task *task;
c66ac9db
NB		 4976 unsigned long flags;
4977 /*
4978 * Empty the struct se_device's struct se_task state list.
4979 */
4980 spin_lock_irqsave(&dev->execute_task_lock, flags);
4981 while ((task = transport_get_task_from_state_list(dev))) {
e3d6f909 4982 if (!task->task_se_cmd) {
6708bb27 4983 pr_err("task->task_se_cmd is NULL!\n");
c66ac9db
NB		 4984 continue;
4985 }
e3d6f909 4986 cmd = task->task_se_cmd;
c66ac9db 4987
c66ac9db
NB		 4988 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
4989
a1d8b49a 4990 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4991
6708bb27
AG		 4992 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
4993 " i_state: %d, t_state/def_t_state:"
c66ac9db 4994 " %d/%d cdb: 0x%02x\n", cmd, task,
6708bb27
AG		 4995 cmd->se_tfo->get_task_tag(cmd),
4996 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db 4997 cmd->t_state, cmd->deferred_t_state,
a1d8b49a 4998 cmd->t_task_cdb[0]);
6708bb27 4999 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
c66ac9db
NB		 5000 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5001 " t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909 5002 cmd->se_tfo->get_task_tag(cmd),
6708bb27 5003 cmd->t_task_list_num,
a1d8b49a
AG		 5004 atomic_read(&cmd->t_task_cdbs_left),
5005 atomic_read(&cmd->t_task_cdbs_sent),
5006 atomic_read(&cmd->t_transport_active),
5007 atomic_read(&cmd->t_transport_stop),
5008 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 5009
5010 if (atomic_read(&task->task_active)) {
5011 atomic_set(&task->task_stop, 1);
5012 spin_unlock_irqrestore(
a1d8b49a 5013 &cmd->t_state_lock, flags);
c66ac9db 5014
6708bb27 5015 pr_debug("Waiting for task: %p to shutdown for dev:"
c66ac9db
NB		 5016 " %p\n", task, dev);
5017 wait_for_completion(&task->task_stop_comp);
6708bb27 5018 pr_debug("Completed task: %p shutdown for dev: %p\n",
c66ac9db
NB		 5019 task, dev);
5020
a1d8b49a
AG		 5021 spin_lock_irqsave(&cmd->t_state_lock, flags);
5022 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 5023
5024 atomic_set(&task->task_active, 0);
5025 atomic_set(&task->task_stop, 0);
52208ae3
NB		 5026 } else {
5027 if (atomic_read(&task->task_execute_queue) != 0)
5028 transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 5029 }
5030 __transport_stop_task_timer(task, &flags);
5031
6708bb27 5032 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
c66ac9db 5033 spin_unlock_irqrestore(
a1d8b49a 5034 &cmd->t_state_lock, flags);
c66ac9db 5035
6708bb27 5036 pr_debug("Skipping task: %p, dev: %p for"
c66ac9db 5037 " t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a 5038 atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db
NB		 5039
5040 spin_lock_irqsave(&dev->execute_task_lock, flags);
5041 continue;
5042 }
5043
a1d8b49a 5044 if (atomic_read(&cmd->t_transport_active)) {
6708bb27 5045 pr_debug("got t_transport_active = 1 for task: %p, dev:"
c66ac9db
NB		 5046 " %p\n", task, dev);
5047
a1d8b49a 5048 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5049 spin_unlock_irqrestore(
a1d8b49a 5050 &cmd->t_state_lock, flags);
c66ac9db
NB		 5051 transport_send_check_condition_and_sense(
5052 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5053 0);
5054 transport_remove_cmd_from_queue(cmd,
5951146d 5055 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5056
5057 transport_lun_remove_cmd(cmd);
5058 transport_cmd_check_stop(cmd, 1, 0);
5059 } else {
5060 spin_unlock_irqrestore(
a1d8b49a 5061 &cmd->t_state_lock, flags);
c66ac9db
NB		 5062
5063 transport_remove_cmd_from_queue(cmd,
5951146d 5064 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5065
5066 transport_lun_remove_cmd(cmd);
5067
5068 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5069 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5070 }
5071
5072 spin_lock_irqsave(&dev->execute_task_lock, flags);
5073 continue;
5074 }
6708bb27 5075 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
c66ac9db
NB		 5076 task, dev);
5077
a1d8b49a 5078 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5079 spin_unlock_irqrestore(
a1d8b49a 5080 &cmd->t_state_lock, flags);
c66ac9db
NB		 5081 transport_send_check_condition_and_sense(cmd,
5082 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5083 transport_remove_cmd_from_queue(cmd,
5951146d 5084 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5085
5086 transport_lun_remove_cmd(cmd);
5087 transport_cmd_check_stop(cmd, 1, 0);
5088 } else {
5089 spin_unlock_irqrestore(
a1d8b49a 5090 &cmd->t_state_lock, flags);
c66ac9db
NB		 5091
5092 transport_remove_cmd_from_queue(cmd,
5951146d 5093 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5094 transport_lun_remove_cmd(cmd);
5095
5096 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5097 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5098 }
5099
5100 spin_lock_irqsave(&dev->execute_task_lock, flags);
5101 }
5102 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5103 /*
5104 * Empty the struct se_device's struct se_cmd list.
5105 */
5951146d 5106 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
c66ac9db 5107
6708bb27 5108 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5951146d 5109 cmd, cmd->t_state);
c66ac9db 5110
a1d8b49a 5111 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db
NB		 5112 transport_send_check_condition_and_sense(cmd,
5113 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5114
5115 transport_lun_remove_cmd(cmd);
5116 transport_cmd_check_stop(cmd, 1, 0);
5117 } else {
5118 transport_lun_remove_cmd(cmd);
5119 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5120 transport_generic_remove(cmd, 0);
c66ac9db 5121 }
c66ac9db 5122 }
c66ac9db
NB		 5123}
5124
5125/* transport_processing_thread():
5126 *
5127 *
5128 */
5129static int transport_processing_thread(void *param)
5130{
5951146d 5131 int ret;
c66ac9db
NB		 5132 struct se_cmd *cmd;
5133 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 5134
5135 set_user_nice(current, -20);
5136
5137 while (!kthread_should_stop()) {
e3d6f909
AG		 5138 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5139 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 5140 kthread_should_stop());
5141 if (ret < 0)
5142 goto out;
5143
5144 spin_lock_irq(&dev->dev_status_lock);
5145 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5146 spin_unlock_irq(&dev->dev_status_lock);
5147 transport_processing_shutdown(dev);
5148 continue;
5149 }
5150 spin_unlock_irq(&dev->dev_status_lock);
5151
5152get_cmd:
5153 __transport_execute_tasks(dev);
5154
5951146d
AG		 5155 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5156 if (!cmd)
c66ac9db
NB		 5157 continue;
5158
5951146d 5159 switch (cmd->t_state) {
680b73c5
CH		 5160 case TRANSPORT_NEW_CMD:
5161 BUG();
5162 break;
c66ac9db 5163 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 5164 if (!cmd->se_tfo->new_cmd_map) {
5165 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 5166 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5167 BUG();
5168 }
e3d6f909 5169 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 5170 if (ret < 0) {
5171 cmd->transport_error_status = ret;
5172 transport_generic_request_failure(cmd, NULL,
5173 0, (cmd->data_direction !=
5174 DMA_TO_DEVICE));
5175 break;
5176 }
c66ac9db 5177 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 5178 if (ret == -EAGAIN)
5179 break;
5180 else if (ret < 0) {
c66ac9db
NB		 5181 cmd->transport_error_status = ret;
5182 transport_generic_request_failure(cmd, NULL,
5183 0, (cmd->data_direction !=
5184 DMA_TO_DEVICE));
5185 }
5186 break;
5187 case TRANSPORT_PROCESS_WRITE:
5188 transport_generic_process_write(cmd);
5189 break;
5190 case TRANSPORT_COMPLETE_OK:
5191 transport_stop_all_task_timers(cmd);
5192 transport_generic_complete_ok(cmd);
5193 break;
5194 case TRANSPORT_REMOVE:
35462975 5195 transport_generic_remove(cmd, 0);
c66ac9db 5196 break;
f4366772 5197 case TRANSPORT_FREE_CMD_INTR:
35462975 5198 transport_generic_free_cmd(cmd, 0, 0);
f4366772 5199 break;
c66ac9db
NB		 5200 case TRANSPORT_PROCESS_TMR:
5201 transport_generic_do_tmr(cmd);
5202 break;
5203 case TRANSPORT_COMPLETE_FAILURE:
5204 transport_generic_request_failure(cmd, NULL, 1, 1);
5205 break;
5206 case TRANSPORT_COMPLETE_TIMEOUT:
5207 transport_stop_all_task_timers(cmd);
5208 transport_generic_request_timeout(cmd);
5209 break;
07bde79a
NB		 5210 case TRANSPORT_COMPLETE_QF_WP:
5211 transport_generic_write_pending(cmd);
5212 break;
c66ac9db 5213 default:
6708bb27 5214 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 5215 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 5216 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 5217 cmd->se_tfo->get_task_tag(cmd),
5218 cmd->se_tfo->get_cmd_state(cmd),
5219 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 5220 BUG();
5221 }
5222
5223 goto get_cmd;
5224 }
5225
5226out:
5227 transport_release_all_cmds(dev);
5228 dev->process_thread = NULL;
5229 return 0;
5230}
kernel source for telekom puls (alcatel/mediatek)