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gma500: udelay(20000) it too long again
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / target_core_transport.c
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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
29#include <linux/version.h>
30#include <linux/net.h>
31#include <linux/delay.h>
32#include <linux/string.h>
33#include <linux/timer.h>
34#include <linux/slab.h>
35#include <linux/blkdev.h>
36#include <linux/spinlock.h>
c66ac9db
NB		 37#include <linux/kthread.h>
38#include <linux/in.h>
39#include <linux/cdrom.h>
40#include <asm/unaligned.h>
41#include <net/sock.h>
42#include <net/tcp.h>
43#include <scsi/scsi.h>
44#include <scsi/scsi_cmnd.h>
e66ecd50 45#include <scsi/scsi_tcq.h>
c66ac9db
NB		 46
47#include <target/target_core_base.h>
48#include <target/target_core_device.h>
49#include <target/target_core_tmr.h>
50#include <target/target_core_tpg.h>
51#include <target/target_core_transport.h>
52#include <target/target_core_fabric_ops.h>
53#include <target/target_core_configfs.h>
54
55#include "target_core_alua.h"
56#include "target_core_hba.h"
57#include "target_core_pr.h"
58#include "target_core_scdb.h"
59#include "target_core_ua.h"
60
e3d6f909 61static int sub_api_initialized;
c66ac9db
NB		 62
63static struct kmem_cache *se_cmd_cache;
64static struct kmem_cache *se_sess_cache;
65struct kmem_cache *se_tmr_req_cache;
66struct kmem_cache *se_ua_cache;
c66ac9db
NB		 67struct kmem_cache *t10_pr_reg_cache;
68struct kmem_cache *t10_alua_lu_gp_cache;
69struct kmem_cache *t10_alua_lu_gp_mem_cache;
70struct kmem_cache *t10_alua_tg_pt_gp_cache;
71struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
72
73/* Used for transport_dev_get_map_*() */
74typedef int (*map_func_t)(struct se_task *, u32);
75
76static int transport_generic_write_pending(struct se_cmd *);
5951146d 77static int transport_processing_thread(void *param);
c66ac9db
NB		 78static int __transport_execute_tasks(struct se_device *dev);
79static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a
NB		 80static int transport_complete_qf(struct se_cmd *cmd);
81static void transport_handle_queue_full(struct se_cmd *cmd,
82 struct se_device *dev, int (*qf_callback)(struct se_cmd *));
c66ac9db
NB		 83static void transport_direct_request_timeout(struct se_cmd *cmd);
84static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 85static u32 transport_allocate_tasks(struct se_cmd *cmd,
ec98f782 86 unsigned long long starting_lba,
c66ac9db 87 enum dma_data_direction data_direction,
ec98f782 88 struct scatterlist *sgl, unsigned int nents);
05d1c7c0 89static int transport_generic_get_mem(struct se_cmd *cmd);
c66ac9db 90static int transport_generic_remove(struct se_cmd *cmd,
35462975 91 int session_reinstatement);
c66ac9db
NB		 92static void transport_release_fe_cmd(struct se_cmd *cmd);
93static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
94 struct se_queue_obj *qobj);
95static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
96static void transport_stop_all_task_timers(struct se_cmd *cmd);
97
e3d6f909 98int init_se_kmem_caches(void)
c66ac9db 99{
c66ac9db
NB		 100 se_cmd_cache = kmem_cache_create("se_cmd_cache",
101 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 102 if (!se_cmd_cache) {
103 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 104 goto out;
105 }
106 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
107 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
108 0, NULL);
6708bb27
AG		 109 if (!se_tmr_req_cache) {
110 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db
NB		 111 " failed\n");
112 goto out;
113 }
114 se_sess_cache = kmem_cache_create("se_sess_cache",
115 sizeof(struct se_session), __alignof__(struct se_session),
116 0, NULL);
6708bb27
AG		 117 if (!se_sess_cache) {
118 pr_err("kmem_cache_create() for struct se_session"
c66ac9db
NB		 119 " failed\n");
120 goto out;
121 }
122 se_ua_cache = kmem_cache_create("se_ua_cache",
123 sizeof(struct se_ua), __alignof__(struct se_ua),
124 0, NULL);
6708bb27
AG		 125 if (!se_ua_cache) {
126 pr_err("kmem_cache_create() for struct se_ua failed\n");
c66ac9db
NB		 127 goto out;
128 }
c66ac9db
NB		 129 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
130 sizeof(struct t10_pr_registration),
131 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 132 if (!t10_pr_reg_cache) {
133 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db
NB		 134 " failed\n");
135 goto out;
136 }
137 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
138 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
139 0, NULL);
6708bb27
AG		 140 if (!t10_alua_lu_gp_cache) {
141 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db
NB		 142 " failed\n");
143 goto out;
144 }
145 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
146 sizeof(struct t10_alua_lu_gp_member),
147 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 148 if (!t10_alua_lu_gp_mem_cache) {
149 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db
NB		 150 "cache failed\n");
151 goto out;
152 }
153 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
154 sizeof(struct t10_alua_tg_pt_gp),
155 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 156 if (!t10_alua_tg_pt_gp_cache) {
157 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 158 "cache failed\n");
159 goto out;
160 }
161 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
162 "t10_alua_tg_pt_gp_mem_cache",
163 sizeof(struct t10_alua_tg_pt_gp_member),
164 __alignof__(struct t10_alua_tg_pt_gp_member),
165 0, NULL);
6708bb27
AG		 166 if (!t10_alua_tg_pt_gp_mem_cache) {
167 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 168 "mem_t failed\n");
169 goto out;
170 }
171
c66ac9db
NB		 172 return 0;
173out:
174 if (se_cmd_cache)
175 kmem_cache_destroy(se_cmd_cache);
176 if (se_tmr_req_cache)
177 kmem_cache_destroy(se_tmr_req_cache);
178 if (se_sess_cache)
179 kmem_cache_destroy(se_sess_cache);
180 if (se_ua_cache)
181 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 182 if (t10_pr_reg_cache)
183 kmem_cache_destroy(t10_pr_reg_cache);
184 if (t10_alua_lu_gp_cache)
185 kmem_cache_destroy(t10_alua_lu_gp_cache);
186 if (t10_alua_lu_gp_mem_cache)
187 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
188 if (t10_alua_tg_pt_gp_cache)
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 if (t10_alua_tg_pt_gp_mem_cache)
191 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 192 return -ENOMEM;
c66ac9db
NB		 193}
194
e3d6f909 195void release_se_kmem_caches(void)
c66ac9db 196{
c66ac9db
NB		 197 kmem_cache_destroy(se_cmd_cache);
198 kmem_cache_destroy(se_tmr_req_cache);
199 kmem_cache_destroy(se_sess_cache);
200 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 201 kmem_cache_destroy(t10_pr_reg_cache);
202 kmem_cache_destroy(t10_alua_lu_gp_cache);
203 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
205 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 206}
207
e3d6f909
AG		 208/* This code ensures unique mib indexes are handed out. */
209static DEFINE_SPINLOCK(scsi_mib_index_lock);
210static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 211
212/*
213 * Allocate a new row index for the entry type specified
214 */
215u32 scsi_get_new_index(scsi_index_t type)
216{
217 u32 new_index;
218
e3d6f909 219 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 220
e3d6f909
AG		 221 spin_lock(&scsi_mib_index_lock);
222 new_index = ++scsi_mib_index[type];
223 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 224
225 return new_index;
226}
227
c66ac9db
NB		 228void transport_init_queue_obj(struct se_queue_obj *qobj)
229{
230 atomic_set(&qobj->queue_cnt, 0);
231 INIT_LIST_HEAD(&qobj->qobj_list);
232 init_waitqueue_head(&qobj->thread_wq);
233 spin_lock_init(&qobj->cmd_queue_lock);
234}
235EXPORT_SYMBOL(transport_init_queue_obj);
236
237static int transport_subsystem_reqmods(void)
238{
239 int ret;
240
241 ret = request_module("target_core_iblock");
242 if (ret != 0)
6708bb27 243 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 244
245 ret = request_module("target_core_file");
246 if (ret != 0)
6708bb27 247 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 248
249 ret = request_module("target_core_pscsi");
250 if (ret != 0)
6708bb27 251 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 252
253 ret = request_module("target_core_stgt");
254 if (ret != 0)
6708bb27 255 pr_err("Unable to load target_core_stgt\n");
c66ac9db
NB		 256
257 return 0;
258}
259
260int transport_subsystem_check_init(void)
261{
e3d6f909
AG		 262 int ret;
263
264 if (sub_api_initialized)
c66ac9db
NB		 265 return 0;
266 /*
267 * Request the loading of known TCM subsystem plugins..
268 */
e3d6f909
AG		 269 ret = transport_subsystem_reqmods();
270 if (ret < 0)
271 return ret;
c66ac9db 272
e3d6f909 273 sub_api_initialized = 1;
c66ac9db
NB		 274 return 0;
275}
276
277struct se_session *transport_init_session(void)
278{
279 struct se_session *se_sess;
280
281 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 282 if (!se_sess) {
283 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 284 " se_sess_cache\n");
285 return ERR_PTR(-ENOMEM);
286 }
287 INIT_LIST_HEAD(&se_sess->sess_list);
288 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 289
290 return se_sess;
291}
292EXPORT_SYMBOL(transport_init_session);
293
294/*
295 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
296 */
297void __transport_register_session(
298 struct se_portal_group *se_tpg,
299 struct se_node_acl *se_nacl,
300 struct se_session *se_sess,
301 void *fabric_sess_ptr)
302{
303 unsigned char buf[PR_REG_ISID_LEN];
304
305 se_sess->se_tpg = se_tpg;
306 se_sess->fabric_sess_ptr = fabric_sess_ptr;
307 /*
308 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
309 *
310 * Only set for struct se_session's that will actually be moving I/O.
311 * eg: *NOT* discovery sessions.
312 */
313 if (se_nacl) {
314 /*
315 * If the fabric module supports an ISID based TransportID,
316 * save this value in binary from the fabric I_T Nexus now.
317 */
e3d6f909 318 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 319 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 320 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 321 &buf[0], PR_REG_ISID_LEN);
322 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
323 }
324 spin_lock_irq(&se_nacl->nacl_sess_lock);
325 /*
326 * The se_nacl->nacl_sess pointer will be set to the
327 * last active I_T Nexus for each struct se_node_acl.
328 */
329 se_nacl->nacl_sess = se_sess;
330
331 list_add_tail(&se_sess->sess_acl_list,
332 &se_nacl->acl_sess_list);
333 spin_unlock_irq(&se_nacl->nacl_sess_lock);
334 }
335 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
336
6708bb27 337 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 338 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 339}
340EXPORT_SYMBOL(__transport_register_session);
341
342void transport_register_session(
343 struct se_portal_group *se_tpg,
344 struct se_node_acl *se_nacl,
345 struct se_session *se_sess,
346 void *fabric_sess_ptr)
347{
348 spin_lock_bh(&se_tpg->session_lock);
349 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
350 spin_unlock_bh(&se_tpg->session_lock);
351}
352EXPORT_SYMBOL(transport_register_session);
353
354void transport_deregister_session_configfs(struct se_session *se_sess)
355{
356 struct se_node_acl *se_nacl;
23388864 357 unsigned long flags;
c66ac9db
NB		 358 /*
359 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
360 */
361 se_nacl = se_sess->se_node_acl;
6708bb27 362 if (se_nacl) {
23388864 363 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 364 list_del(&se_sess->sess_acl_list);
365 /*
366 * If the session list is empty, then clear the pointer.
367 * Otherwise, set the struct se_session pointer from the tail
368 * element of the per struct se_node_acl active session list.
369 */
370 if (list_empty(&se_nacl->acl_sess_list))
371 se_nacl->nacl_sess = NULL;
372 else {
373 se_nacl->nacl_sess = container_of(
374 se_nacl->acl_sess_list.prev,
375 struct se_session, sess_acl_list);
376 }
23388864 377 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 378 }
379}
380EXPORT_SYMBOL(transport_deregister_session_configfs);
381
382void transport_free_session(struct se_session *se_sess)
383{
384 kmem_cache_free(se_sess_cache, se_sess);
385}
386EXPORT_SYMBOL(transport_free_session);
387
388void transport_deregister_session(struct se_session *se_sess)
389{
390 struct se_portal_group *se_tpg = se_sess->se_tpg;
391 struct se_node_acl *se_nacl;
392
6708bb27 393 if (!se_tpg) {
c66ac9db
NB		 394 transport_free_session(se_sess);
395 return;
396 }
c66ac9db
NB		 397
398 spin_lock_bh(&se_tpg->session_lock);
399 list_del(&se_sess->sess_list);
400 se_sess->se_tpg = NULL;
401 se_sess->fabric_sess_ptr = NULL;
402 spin_unlock_bh(&se_tpg->session_lock);
403
404 /*
405 * Determine if we need to do extra work for this initiator node's
406 * struct se_node_acl if it had been previously dynamically generated.
407 */
408 se_nacl = se_sess->se_node_acl;
6708bb27 409 if (se_nacl) {
c66ac9db
NB		 410 spin_lock_bh(&se_tpg->acl_node_lock);
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--;
416 spin_unlock_bh(&se_tpg->acl_node_lock);
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
NB		 421 se_nacl);
422 spin_lock_bh(&se_tpg->acl_node_lock);
423 }
424 }
425 spin_unlock_bh(&se_tpg->acl_node_lock);
426 }
427
428 transport_free_session(se_sess);
429
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{
5951146d 596 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 597 transport_lun_remove_cmd(cmd);
598
599 if (transport_cmd_check_stop_to_fabric(cmd))
600 return;
601 if (remove)
35462975 602 transport_generic_remove(cmd, 0);
c66ac9db
NB		 603}
604
605void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
606{
5951146d 607 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 608
609 if (transport_cmd_check_stop_to_fabric(cmd))
610 return;
611
35462975 612 transport_generic_remove(cmd, 0);
c66ac9db
NB		 613}
614
5951146d 615static void transport_add_cmd_to_queue(
c66ac9db
NB		 616 struct se_cmd *cmd,
617 int t_state)
618{
619 struct se_device *dev = cmd->se_dev;
e3d6f909 620 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 621 unsigned long flags;
622
5951146d 623 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db
NB		 624
625 if (t_state) {
a1d8b49a 626 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 627 cmd->t_state = t_state;
a1d8b49a
AG		 628 atomic_set(&cmd->t_transport_active, 1);
629 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 630 }
631
632 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
07bde79a
NB		 633 if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
634 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
635 list_add(&cmd->se_queue_node, &qobj->qobj_list);
636 } else
637 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
a1d8b49a 638 atomic_inc(&cmd->t_transport_queue_active);
c66ac9db
NB		 639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640
641 atomic_inc(&qobj->queue_cnt);
642 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 643}
644
5951146d
AG		 645static struct se_cmd *
646transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 647{
5951146d 648 struct se_cmd *cmd;
c66ac9db
NB		 649 unsigned long flags;
650
651 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
652 if (list_empty(&qobj->qobj_list)) {
653 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
654 return NULL;
655 }
5951146d 656 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 657
a1d8b49a 658 atomic_dec(&cmd->t_transport_queue_active);
c66ac9db 659
5951146d 660 list_del(&cmd->se_queue_node);
c66ac9db
NB		 661 atomic_dec(&qobj->queue_cnt);
662 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
663
5951146d 664 return cmd;
c66ac9db
NB		 665}
666
667static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
668 struct se_queue_obj *qobj)
669{
5951146d 670 struct se_cmd *t;
c66ac9db
NB		 671 unsigned long flags;
672
673 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 674 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 675 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
676 return;
677 }
678
5951146d
AG		 679 list_for_each_entry(t, &qobj->qobj_list, se_queue_node)
680 if (t == cmd) {
a1d8b49a 681 atomic_dec(&cmd->t_transport_queue_active);
5951146d
AG		 682 atomic_dec(&qobj->queue_cnt);
683 list_del(&cmd->se_queue_node);
684 break;
685 }
c66ac9db
NB		 686 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
687
a1d8b49a 688 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 689 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 690 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 691 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 692 }
693}
694
695/*
696 * Completion function used by TCM subsystem plugins (such as FILEIO)
697 * for queueing up response from struct se_subsystem_api->do_task()
698 */
699void transport_complete_sync_cache(struct se_cmd *cmd, int good)
700{
a1d8b49a 701 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 702 struct se_task, t_list);
703
704 if (good) {
705 cmd->scsi_status = SAM_STAT_GOOD;
706 task->task_scsi_status = GOOD;
707 } else {
708 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
709 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 710 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 711 PYX_TRANSPORT_ILLEGAL_REQUEST;
712 }
713
714 transport_complete_task(task, good);
715}
716EXPORT_SYMBOL(transport_complete_sync_cache);
717
718/* transport_complete_task():
719 *
720 * Called from interrupt and non interrupt context depending
721 * on the transport plugin.
722 */
723void transport_complete_task(struct se_task *task, int success)
724{
e3d6f909 725 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 726 struct se_device *dev = task->se_dev;
727 int t_state;
728 unsigned long flags;
729#if 0
6708bb27 730 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 731 cmd->t_task_cdb[0], dev);
c66ac9db 732#endif
e3d6f909 733 if (dev)
c66ac9db 734 atomic_inc(&dev->depth_left);
c66ac9db 735
a1d8b49a 736 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 737 atomic_set(&task->task_active, 0);
738
739 /*
740 * See if any sense data exists, if so set the TASK_SENSE flag.
741 * Also check for any other post completion work that needs to be
742 * done by the plugins.
743 */
744 if (dev && dev->transport->transport_complete) {
745 if (dev->transport->transport_complete(task) != 0) {
746 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
747 task->task_sense = 1;
748 success = 1;
749 }
750 }
751
752 /*
753 * See if we are waiting for outstanding struct se_task
754 * to complete for an exception condition
755 */
756 if (atomic_read(&task->task_stop)) {
757 /*
a1d8b49a 758 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 759 * previously thrown its timeout exception handler.
760 */
761 if (atomic_read(&task->task_timeout)) {
a1d8b49a 762 atomic_dec(&cmd->t_se_count);
c66ac9db
NB		 763 atomic_set(&task->task_timeout, 0);
764 }
a1d8b49a 765 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 766
767 complete(&task->task_stop_comp);
768 return;
769 }
770 /*
771 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
772 * left counter to determine when the struct se_cmd is ready to be queued to
773 * the processing thread.
774 */
775 if (atomic_read(&task->task_timeout)) {
6708bb27
AG		 776 if (!atomic_dec_and_test(
777 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 778 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 779 flags);
780 return;
781 }
782 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 783 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 784
785 transport_add_cmd_to_queue(cmd, t_state);
786 return;
787 }
a1d8b49a 788 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 789
790 /*
791 * Decrement the outstanding t_task_cdbs_left count. The last
792 * struct se_task from struct se_cmd will complete itself into the
793 * device queue depending upon int success.
794 */
6708bb27 795 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 796 if (!success)
a1d8b49a 797 cmd->t_tasks_failed = 1;
c66ac9db 798
a1d8b49a 799 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 800 return;
801 }
802
a1d8b49a 803 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 804 t_state = TRANSPORT_COMPLETE_FAILURE;
805 if (!task->task_error_status) {
806 task->task_error_status =
807 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
808 cmd->transport_error_status =
809 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
810 }
811 } else {
a1d8b49a 812 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 813 t_state = TRANSPORT_COMPLETE_OK;
814 }
a1d8b49a 815 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 816
817 transport_add_cmd_to_queue(cmd, t_state);
818}
819EXPORT_SYMBOL(transport_complete_task);
820
821/*
822 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
823 * struct se_task list are ready to be added to the active execution list
824 * struct se_device
825
826 * Called with se_dev_t->execute_task_lock called.
827 */
828static inline int transport_add_task_check_sam_attr(
829 struct se_task *task,
830 struct se_task *task_prev,
831 struct se_device *dev)
832{
833 /*
834 * No SAM Task attribute emulation enabled, add to tail of
835 * execution queue
836 */
837 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
838 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
839 return 0;
840 }
841 /*
842 * HEAD_OF_QUEUE attribute for received CDB, which means
843 * the first task that is associated with a struct se_cmd goes to
844 * head of the struct se_device->execute_task_list, and task_prev
845 * after that for each subsequent task
846 */
e66ecd50 847 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 848 list_add(&task->t_execute_list,
849 (task_prev != NULL) ?
850 &task_prev->t_execute_list :
851 &dev->execute_task_list);
852
6708bb27 853 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 854 " in execution queue\n",
6708bb27 855 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 856 return 1;
857 }
858 /*
859 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
860 * transitioned from Dermant -> Active state, and are added to the end
861 * of the struct se_device->execute_task_list
862 */
863 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
864 return 0;
865}
866
867/* __transport_add_task_to_execute_queue():
868 *
869 * Called with se_dev_t->execute_task_lock called.
870 */
871static void __transport_add_task_to_execute_queue(
872 struct se_task *task,
873 struct se_task *task_prev,
874 struct se_device *dev)
875{
876 int head_of_queue;
877
878 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
879 atomic_inc(&dev->execute_tasks);
880
881 if (atomic_read(&task->task_state_active))
882 return;
883 /*
884 * Determine if this task needs to go to HEAD_OF_QUEUE for the
885 * state list as well. Running with SAM Task Attribute emulation
886 * will always return head_of_queue == 0 here
887 */
888 if (head_of_queue)
889 list_add(&task->t_state_list, (task_prev) ?
890 &task_prev->t_state_list :
891 &dev->state_task_list);
892 else
893 list_add_tail(&task->t_state_list, &dev->state_task_list);
894
895 atomic_set(&task->task_state_active, 1);
896
6708bb27 897 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 898 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 899 task, dev);
900}
901
902static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
903{
904 struct se_device *dev;
905 struct se_task *task;
906 unsigned long flags;
907
a1d8b49a
AG		 908 spin_lock_irqsave(&cmd->t_state_lock, flags);
909 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 910 dev = task->se_dev;
911
912 if (atomic_read(&task->task_state_active))
913 continue;
914
915 spin_lock(&dev->execute_task_lock);
916 list_add_tail(&task->t_state_list, &dev->state_task_list);
917 atomic_set(&task->task_state_active, 1);
918
6708bb27
AG		 919 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
920 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 921 task->task_se_cmd), task, dev);
922
923 spin_unlock(&dev->execute_task_lock);
924 }
a1d8b49a 925 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 926}
927
928static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
929{
5951146d 930 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 931 struct se_task *task, *task_prev = NULL;
932 unsigned long flags;
933
934 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 935 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 936 if (atomic_read(&task->task_execute_queue))
937 continue;
938 /*
939 * __transport_add_task_to_execute_queue() handles the
940 * SAM Task Attribute emulation if enabled
941 */
942 __transport_add_task_to_execute_queue(task, task_prev, dev);
943 atomic_set(&task->task_execute_queue, 1);
944 task_prev = task;
945 }
946 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 947}
948
949/* transport_remove_task_from_execute_queue():
950 *
951 *
952 */
52208ae3 953void transport_remove_task_from_execute_queue(
c66ac9db
NB		 954 struct se_task *task,
955 struct se_device *dev)
956{
957 unsigned long flags;
958
af57c3ac
NB		 959 if (atomic_read(&task->task_execute_queue) == 0) {
960 dump_stack();
961 return;
962 }
963
c66ac9db
NB		 964 spin_lock_irqsave(&dev->execute_task_lock, flags);
965 list_del(&task->t_execute_list);
af57c3ac 966 atomic_set(&task->task_execute_queue, 0);
c66ac9db
NB		 967 atomic_dec(&dev->execute_tasks);
968 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
969}
970
07bde79a
NB		 971/*
972 * Handle QUEUE_FULL / -EAGAIN status
973 */
974
975static void target_qf_do_work(struct work_struct *work)
976{
977 struct se_device *dev = container_of(work, struct se_device,
978 qf_work_queue);
979 struct se_cmd *cmd, *cmd_tmp;
980
981 spin_lock_irq(&dev->qf_cmd_lock);
982 list_for_each_entry_safe(cmd, cmd_tmp, &dev->qf_cmd_list, se_qf_node) {
983
984 list_del(&cmd->se_qf_node);
985 atomic_dec(&dev->dev_qf_count);
986 smp_mb__after_atomic_dec();
987 spin_unlock_irq(&dev->qf_cmd_lock);
988
6708bb27 989 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a
NB		 990 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
991 (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
992 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
993 : "UNKNOWN");
994 /*
995 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
996 * has been added to head of queue
997 */
998 transport_add_cmd_to_queue(cmd, cmd->t_state);
999
1000 spin_lock_irq(&dev->qf_cmd_lock);
1001 }
1002 spin_unlock_irq(&dev->qf_cmd_lock);
1003}
1004
c66ac9db
NB		 1005unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1006{
1007 switch (cmd->data_direction) {
1008 case DMA_NONE:
1009 return "NONE";
1010 case DMA_FROM_DEVICE:
1011 return "READ";
1012 case DMA_TO_DEVICE:
1013 return "WRITE";
1014 case DMA_BIDIRECTIONAL:
1015 return "BIDI";
1016 default:
1017 break;
1018 }
1019
1020 return "UNKNOWN";
1021}
1022
1023void transport_dump_dev_state(
1024 struct se_device *dev,
1025 char *b,
1026 int *bl)
1027{
1028 *bl += sprintf(b + *bl, "Status: ");
1029 switch (dev->dev_status) {
1030 case TRANSPORT_DEVICE_ACTIVATED:
1031 *bl += sprintf(b + *bl, "ACTIVATED");
1032 break;
1033 case TRANSPORT_DEVICE_DEACTIVATED:
1034 *bl += sprintf(b + *bl, "DEACTIVATED");
1035 break;
1036 case TRANSPORT_DEVICE_SHUTDOWN:
1037 *bl += sprintf(b + *bl, "SHUTDOWN");
1038 break;
1039 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1040 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1041 *bl += sprintf(b + *bl, "OFFLINE");
1042 break;
1043 default:
1044 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1045 break;
1046 }
1047
1048 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1049 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1050 dev->queue_depth);
1051 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1052 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1053 *bl += sprintf(b + *bl, " ");
1054}
1055
1056/* transport_release_all_cmds():
1057 *
1058 *
1059 */
1060static void transport_release_all_cmds(struct se_device *dev)
1061{
5951146d 1062 struct se_cmd *cmd, *tcmd;
c66ac9db
NB		 1063 int bug_out = 0, t_state;
1064 unsigned long flags;
1065
e3d6f909 1066 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
5951146d
AG		 1067 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1068 se_queue_node) {
1069 t_state = cmd->t_state;
1070 list_del(&cmd->se_queue_node);
e3d6f909 1071 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
c66ac9db
NB		 1072 flags);
1073
6708bb27 1074 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
c66ac9db 1075 " t_state: %u directly\n",
e3d6f909
AG		 1076 cmd->se_tfo->get_task_tag(cmd),
1077 cmd->se_tfo->get_cmd_state(cmd), t_state);
c66ac9db
NB		 1078
1079 transport_release_fe_cmd(cmd);
1080 bug_out = 1;
1081
e3d6f909 1082 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db 1083 }
e3d6f909 1084 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db
NB		 1085#if 0
1086 if (bug_out)
1087 BUG();
1088#endif
1089}
1090
1091void transport_dump_vpd_proto_id(
1092 struct t10_vpd *vpd,
1093 unsigned char *p_buf,
1094 int p_buf_len)
1095{
1096 unsigned char buf[VPD_TMP_BUF_SIZE];
1097 int len;
1098
1099 memset(buf, 0, VPD_TMP_BUF_SIZE);
1100 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1101
1102 switch (vpd->protocol_identifier) {
1103 case 0x00:
1104 sprintf(buf+len, "Fibre Channel\n");
1105 break;
1106 case 0x10:
1107 sprintf(buf+len, "Parallel SCSI\n");
1108 break;
1109 case 0x20:
1110 sprintf(buf+len, "SSA\n");
1111 break;
1112 case 0x30:
1113 sprintf(buf+len, "IEEE 1394\n");
1114 break;
1115 case 0x40:
1116 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1117 " Protocol\n");
1118 break;
1119 case 0x50:
1120 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1121 break;
1122 case 0x60:
1123 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1124 break;
1125 case 0x70:
1126 sprintf(buf+len, "Automation/Drive Interface Transport"
1127 " Protocol\n");
1128 break;
1129 case 0x80:
1130 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1131 break;
1132 default:
1133 sprintf(buf+len, "Unknown 0x%02x\n",
1134 vpd->protocol_identifier);
1135 break;
1136 }
1137
1138 if (p_buf)
1139 strncpy(p_buf, buf, p_buf_len);
1140 else
6708bb27 1141 pr_debug("%s", buf);
c66ac9db
NB		 1142}
1143
1144void
1145transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1146{
1147 /*
1148 * Check if the Protocol Identifier Valid (PIV) bit is set..
1149 *
1150 * from spc3r23.pdf section 7.5.1
1151 */
1152 if (page_83[1] & 0x80) {
1153 vpd->protocol_identifier = (page_83[0] & 0xf0);
1154 vpd->protocol_identifier_set = 1;
1155 transport_dump_vpd_proto_id(vpd, NULL, 0);
1156 }
1157}
1158EXPORT_SYMBOL(transport_set_vpd_proto_id);
1159
1160int transport_dump_vpd_assoc(
1161 struct t10_vpd *vpd,
1162 unsigned char *p_buf,
1163 int p_buf_len)
1164{
1165 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1166 int ret = 0;
1167 int len;
c66ac9db
NB		 1168
1169 memset(buf, 0, VPD_TMP_BUF_SIZE);
1170 len = sprintf(buf, "T10 VPD Identifier Association: ");
1171
1172 switch (vpd->association) {
1173 case 0x00:
1174 sprintf(buf+len, "addressed logical unit\n");
1175 break;
1176 case 0x10:
1177 sprintf(buf+len, "target port\n");
1178 break;
1179 case 0x20:
1180 sprintf(buf+len, "SCSI target device\n");
1181 break;
1182 default:
1183 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1184 ret = -EINVAL;
c66ac9db
NB		 1185 break;
1186 }
1187
1188 if (p_buf)
1189 strncpy(p_buf, buf, p_buf_len);
1190 else
6708bb27 1191 pr_debug("%s", buf);
c66ac9db
NB		 1192
1193 return ret;
1194}
1195
1196int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1197{
1198 /*
1199 * The VPD identification association..
1200 *
1201 * from spc3r23.pdf Section 7.6.3.1 Table 297
1202 */
1203 vpd->association = (page_83[1] & 0x30);
1204 return transport_dump_vpd_assoc(vpd, NULL, 0);
1205}
1206EXPORT_SYMBOL(transport_set_vpd_assoc);
1207
1208int transport_dump_vpd_ident_type(
1209 struct t10_vpd *vpd,
1210 unsigned char *p_buf,
1211 int p_buf_len)
1212{
1213 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1214 int ret = 0;
1215 int len;
c66ac9db
NB		 1216
1217 memset(buf, 0, VPD_TMP_BUF_SIZE);
1218 len = sprintf(buf, "T10 VPD Identifier Type: ");
1219
1220 switch (vpd->device_identifier_type) {
1221 case 0x00:
1222 sprintf(buf+len, "Vendor specific\n");
1223 break;
1224 case 0x01:
1225 sprintf(buf+len, "T10 Vendor ID based\n");
1226 break;
1227 case 0x02:
1228 sprintf(buf+len, "EUI-64 based\n");
1229 break;
1230 case 0x03:
1231 sprintf(buf+len, "NAA\n");
1232 break;
1233 case 0x04:
1234 sprintf(buf+len, "Relative target port identifier\n");
1235 break;
1236 case 0x08:
1237 sprintf(buf+len, "SCSI name string\n");
1238 break;
1239 default:
1240 sprintf(buf+len, "Unsupported: 0x%02x\n",
1241 vpd->device_identifier_type);
e3d6f909 1242 ret = -EINVAL;
c66ac9db
NB		 1243 break;
1244 }
1245
e3d6f909
AG		 1246 if (p_buf) {
1247 if (p_buf_len < strlen(buf)+1)
1248 return -EINVAL;
c66ac9db 1249 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1250 } else {
6708bb27 1251 pr_debug("%s", buf);
e3d6f909 1252 }
c66ac9db
NB		 1253
1254 return ret;
1255}
1256
1257int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1258{
1259 /*
1260 * The VPD identifier type..
1261 *
1262 * from spc3r23.pdf Section 7.6.3.1 Table 298
1263 */
1264 vpd->device_identifier_type = (page_83[1] & 0x0f);
1265 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1266}
1267EXPORT_SYMBOL(transport_set_vpd_ident_type);
1268
1269int transport_dump_vpd_ident(
1270 struct t10_vpd *vpd,
1271 unsigned char *p_buf,
1272 int p_buf_len)
1273{
1274 unsigned char buf[VPD_TMP_BUF_SIZE];
1275 int ret = 0;
1276
1277 memset(buf, 0, VPD_TMP_BUF_SIZE);
1278
1279 switch (vpd->device_identifier_code_set) {
1280 case 0x01: /* Binary */
1281 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1282 &vpd->device_identifier[0]);
1283 break;
1284 case 0x02: /* ASCII */
1285 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1286 &vpd->device_identifier[0]);
1287 break;
1288 case 0x03: /* UTF-8 */
1289 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1290 &vpd->device_identifier[0]);
1291 break;
1292 default:
1293 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1294 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1295 ret = -EINVAL;
c66ac9db
NB		 1296 break;
1297 }
1298
1299 if (p_buf)
1300 strncpy(p_buf, buf, p_buf_len);
1301 else
6708bb27 1302 pr_debug("%s", buf);
c66ac9db
NB		 1303
1304 return ret;
1305}
1306
1307int
1308transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1309{
1310 static const char hex_str[] = "0123456789abcdef";
1311 int j = 0, i = 4; /* offset to start of the identifer */
1312
1313 /*
1314 * The VPD Code Set (encoding)
1315 *
1316 * from spc3r23.pdf Section 7.6.3.1 Table 296
1317 */
1318 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1319 switch (vpd->device_identifier_code_set) {
1320 case 0x01: /* Binary */
1321 vpd->device_identifier[j++] =
1322 hex_str[vpd->device_identifier_type];
1323 while (i < (4 + page_83[3])) {
1324 vpd->device_identifier[j++] =
1325 hex_str[(page_83[i] & 0xf0) >> 4];
1326 vpd->device_identifier[j++] =
1327 hex_str[page_83[i] & 0x0f];
1328 i++;
1329 }
1330 break;
1331 case 0x02: /* ASCII */
1332 case 0x03: /* UTF-8 */
1333 while (i < (4 + page_83[3]))
1334 vpd->device_identifier[j++] = page_83[i++];
1335 break;
1336 default:
1337 break;
1338 }
1339
1340 return transport_dump_vpd_ident(vpd, NULL, 0);
1341}
1342EXPORT_SYMBOL(transport_set_vpd_ident);
1343
1344static void core_setup_task_attr_emulation(struct se_device *dev)
1345{
1346 /*
1347 * If this device is from Target_Core_Mod/pSCSI, disable the
1348 * SAM Task Attribute emulation.
1349 *
1350 * This is currently not available in upsream Linux/SCSI Target
1351 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1352 */
e3d6f909 1353 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1354 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1355 return;
1356 }
1357
1358 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1359 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1360 " device\n", dev->transport->name,
1361 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1362}
1363
1364static void scsi_dump_inquiry(struct se_device *dev)
1365{
e3d6f909 1366 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1367 int i, device_type;
1368 /*
1369 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1370 */
6708bb27 1371 pr_debug(" Vendor: ");
c66ac9db
NB		 1372 for (i = 0; i < 8; i++)
1373 if (wwn->vendor[i] >= 0x20)
6708bb27 1374 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1375 else
6708bb27 1376 pr_debug(" ");
c66ac9db 1377
6708bb27 1378 pr_debug(" Model: ");
c66ac9db
NB		 1379 for (i = 0; i < 16; i++)
1380 if (wwn->model[i] >= 0x20)
6708bb27 1381 pr_debug("%c", wwn->model[i]);
c66ac9db 1382 else
6708bb27 1383 pr_debug(" ");
c66ac9db 1384
6708bb27 1385 pr_debug(" Revision: ");
c66ac9db
NB		 1386 for (i = 0; i < 4; i++)
1387 if (wwn->revision[i] >= 0x20)
6708bb27 1388 pr_debug("%c", wwn->revision[i]);
c66ac9db 1389 else
6708bb27 1390 pr_debug(" ");
c66ac9db 1391
6708bb27 1392 pr_debug("\n");
c66ac9db 1393
e3d6f909 1394 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1395 pr_debug(" Type: %s ", scsi_device_type(device_type));
1396 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1397 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1398}
1399
1400struct se_device *transport_add_device_to_core_hba(
1401 struct se_hba *hba,
1402 struct se_subsystem_api *transport,
1403 struct se_subsystem_dev *se_dev,
1404 u32 device_flags,
1405 void *transport_dev,
1406 struct se_dev_limits *dev_limits,
1407 const char *inquiry_prod,
1408 const char *inquiry_rev)
1409{
12a18bdc 1410 int force_pt;
c66ac9db
NB		 1411 struct se_device *dev;
1412
1413 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1414 if (!dev) {
1415 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1416 return NULL;
1417 }
c66ac9db 1418
e3d6f909 1419 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1420 dev->dev_flags = device_flags;
1421 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1422 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1423 dev->se_hba = hba;
1424 dev->se_sub_dev = se_dev;
1425 dev->transport = transport;
1426 atomic_set(&dev->active_cmds, 0);
1427 INIT_LIST_HEAD(&dev->dev_list);
1428 INIT_LIST_HEAD(&dev->dev_sep_list);
1429 INIT_LIST_HEAD(&dev->dev_tmr_list);
1430 INIT_LIST_HEAD(&dev->execute_task_list);
1431 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1432 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1433 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1434 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1435 spin_lock_init(&dev->execute_task_lock);
1436 spin_lock_init(&dev->delayed_cmd_lock);
1437 spin_lock_init(&dev->ordered_cmd_lock);
1438 spin_lock_init(&dev->state_task_lock);
1439 spin_lock_init(&dev->dev_alua_lock);
1440 spin_lock_init(&dev->dev_reservation_lock);
1441 spin_lock_init(&dev->dev_status_lock);
1442 spin_lock_init(&dev->dev_status_thr_lock);
1443 spin_lock_init(&dev->se_port_lock);
1444 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1445 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1446
1447 dev->queue_depth = dev_limits->queue_depth;
1448 atomic_set(&dev->depth_left, dev->queue_depth);
1449 atomic_set(&dev->dev_ordered_id, 0);
1450
1451 se_dev_set_default_attribs(dev, dev_limits);
1452
1453 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1454 dev->creation_time = get_jiffies_64();
1455 spin_lock_init(&dev->stats_lock);
1456
1457 spin_lock(&hba->device_lock);
1458 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1459 hba->dev_count++;
1460 spin_unlock(&hba->device_lock);
1461 /*
1462 * Setup the SAM Task Attribute emulation for struct se_device
1463 */
1464 core_setup_task_attr_emulation(dev);
1465 /*
1466 * Force PR and ALUA passthrough emulation with internal object use.
1467 */
1468 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1469 /*
1470 * Setup the Reservations infrastructure for struct se_device
1471 */
1472 core_setup_reservations(dev, force_pt);
1473 /*
1474 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1475 */
1476 if (core_setup_alua(dev, force_pt) < 0)
1477 goto out;
1478
1479 /*
1480 * Startup the struct se_device processing thread
1481 */
1482 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1483 "LIO_%s", dev->transport->name);
c66ac9db 1484 if (IS_ERR(dev->process_thread)) {
6708bb27 1485 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1486 dev->transport->name);
c66ac9db
NB		 1487 goto out;
1488 }
07bde79a
NB		 1489 /*
1490 * Setup work_queue for QUEUE_FULL
1491 */
1492 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1493 /*
1494 * Preload the initial INQUIRY const values if we are doing
1495 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1496 * passthrough because this is being provided by the backend LLD.
1497 * This is required so that transport_get_inquiry() copies these
1498 * originals once back into DEV_T10_WWN(dev) for the virtual device
1499 * setup.
1500 */
e3d6f909 1501 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1502 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1503 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1504 " INQUIRY consts\n");
1505 goto out;
1506 }
1507
e3d6f909
AG		 1508 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1509 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1510 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1511 }
1512 scsi_dump_inquiry(dev);
1513
12a18bdc 1514 return dev;
c66ac9db 1515out:
c66ac9db
NB		 1516 kthread_stop(dev->process_thread);
1517
1518 spin_lock(&hba->device_lock);
1519 list_del(&dev->dev_list);
1520 hba->dev_count--;
1521 spin_unlock(&hba->device_lock);
1522
1523 se_release_vpd_for_dev(dev);
1524
c66ac9db
NB		 1525 kfree(dev);
1526
1527 return NULL;
1528}
1529EXPORT_SYMBOL(transport_add_device_to_core_hba);
1530
1531/* transport_generic_prepare_cdb():
1532 *
1533 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1534 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1535 * The point of this is since we are mapping iSCSI LUNs to
1536 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1537 * devices and HBAs for a loop.
1538 */
1539static inline void transport_generic_prepare_cdb(
1540 unsigned char *cdb)
1541{
1542 switch (cdb[0]) {
1543 case READ_10: /* SBC - RDProtect */
1544 case READ_12: /* SBC - RDProtect */
1545 case READ_16: /* SBC - RDProtect */
1546 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1547 case VERIFY: /* SBC - VRProtect */
1548 case VERIFY_16: /* SBC - VRProtect */
1549 case WRITE_VERIFY: /* SBC - VRProtect */
1550 case WRITE_VERIFY_12: /* SBC - VRProtect */
1551 break;
1552 default:
1553 cdb[1] &= 0x1f; /* clear logical unit number */
1554 break;
1555 }
1556}
1557
1558static struct se_task *
1559transport_generic_get_task(struct se_cmd *cmd,
1560 enum dma_data_direction data_direction)
1561{
1562 struct se_task *task;
5951146d 1563 struct se_device *dev = cmd->se_dev;
c66ac9db 1564
6708bb27 1565 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1566 if (!task) {
6708bb27 1567 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1568 return NULL;
1569 }
1570
1571 INIT_LIST_HEAD(&task->t_list);
1572 INIT_LIST_HEAD(&task->t_execute_list);
1573 INIT_LIST_HEAD(&task->t_state_list);
1574 init_completion(&task->task_stop_comp);
c66ac9db
NB		 1575 task->task_se_cmd = cmd;
1576 task->se_dev = dev;
1577 task->task_data_direction = data_direction;
1578
c66ac9db
NB		 1579 return task;
1580}
1581
1582static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1583
c66ac9db
NB		 1584/*
1585 * Used by fabric modules containing a local struct se_cmd within their
1586 * fabric dependent per I/O descriptor.
1587 */
1588void transport_init_se_cmd(
1589 struct se_cmd *cmd,
1590 struct target_core_fabric_ops *tfo,
1591 struct se_session *se_sess,
1592 u32 data_length,
1593 int data_direction,
1594 int task_attr,
1595 unsigned char *sense_buffer)
1596{
5951146d
AG		 1597 INIT_LIST_HEAD(&cmd->se_lun_node);
1598 INIT_LIST_HEAD(&cmd->se_delayed_node);
1599 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1600 INIT_LIST_HEAD(&cmd->se_qf_node);
c66ac9db 1601
a1d8b49a
AG		 1602 INIT_LIST_HEAD(&cmd->t_task_list);
1603 init_completion(&cmd->transport_lun_fe_stop_comp);
1604 init_completion(&cmd->transport_lun_stop_comp);
1605 init_completion(&cmd->t_transport_stop_comp);
1606 spin_lock_init(&cmd->t_state_lock);
1607 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1608
1609 cmd->se_tfo = tfo;
1610 cmd->se_sess = se_sess;
1611 cmd->data_length = data_length;
1612 cmd->data_direction = data_direction;
1613 cmd->sam_task_attr = task_attr;
1614 cmd->sense_buffer = sense_buffer;
1615}
1616EXPORT_SYMBOL(transport_init_se_cmd);
1617
1618static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1619{
1620 /*
1621 * Check if SAM Task Attribute emulation is enabled for this
1622 * struct se_device storage object
1623 */
5951146d 1624 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1625 return 0;
1626
e66ecd50 1627 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1628 pr_debug("SAM Task Attribute ACA"
c66ac9db 1629 " emulation is not supported\n");
e3d6f909 1630 return -EINVAL;
c66ac9db
NB		 1631 }
1632 /*
1633 * Used to determine when ORDERED commands should go from
1634 * Dormant to Active status.
1635 */
5951146d 1636 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1637 smp_mb__after_atomic_inc();
6708bb27 1638 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1639 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1640 cmd->se_dev->transport->name);
c66ac9db
NB		 1641 return 0;
1642}
1643
1644void transport_free_se_cmd(
1645 struct se_cmd *se_cmd)
1646{
1647 if (se_cmd->se_tmr_req)
1648 core_tmr_release_req(se_cmd->se_tmr_req);
1649 /*
1650 * Check and free any extended CDB buffer that was allocated
1651 */
a1d8b49a
AG		 1652 if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
1653 kfree(se_cmd->t_task_cdb);
c66ac9db
NB		 1654}
1655EXPORT_SYMBOL(transport_free_se_cmd);
1656
1657static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1658
1659/* transport_generic_allocate_tasks():
1660 *
1661 * Called from fabric RX Thread.
1662 */
1663int transport_generic_allocate_tasks(
1664 struct se_cmd *cmd,
1665 unsigned char *cdb)
1666{
1667 int ret;
1668
1669 transport_generic_prepare_cdb(cdb);
1670
1671 /*
1672 * This is needed for early exceptions.
1673 */
1674 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1675
c66ac9db
NB		 1676 /*
1677 * Ensure that the received CDB is less than the max (252 + 8) bytes
1678 * for VARIABLE_LENGTH_CMD
1679 */
1680 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1681 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1682 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1683 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1684 return -EINVAL;
c66ac9db
NB		 1685 }
1686 /*
1687 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1688 * allocate the additional extended CDB buffer now.. Otherwise
1689 * setup the pointer from __t_task_cdb to t_task_cdb.
1690 */
a1d8b49a
AG		 1691 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1692 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1693 GFP_KERNEL);
6708bb27
AG		 1694 if (!cmd->t_task_cdb) {
1695 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1696 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1697 scsi_command_size(cdb),
a1d8b49a 1698 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1699 return -ENOMEM;
c66ac9db
NB		 1700 }
1701 } else
a1d8b49a 1702 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1703 /*
a1d8b49a 1704 * Copy the original CDB into cmd->
c66ac9db 1705 */
a1d8b49a 1706 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1707 /*
1708 * Setup the received CDB based on SCSI defined opcodes and
1709 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1710 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1711 * pointer is expected to be setup before we reach this point.
1712 */
1713 ret = transport_generic_cmd_sequencer(cmd, cdb);
1714 if (ret < 0)
1715 return ret;
1716 /*
1717 * Check for SAM Task Attribute Emulation
1718 */
1719 if (transport_check_alloc_task_attr(cmd) < 0) {
1720 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1721 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1722 return -EINVAL;
c66ac9db
NB		 1723 }
1724 spin_lock(&cmd->se_lun->lun_sep_lock);
1725 if (cmd->se_lun->lun_sep)
1726 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1727 spin_unlock(&cmd->se_lun->lun_sep_lock);
1728 return 0;
1729}
1730EXPORT_SYMBOL(transport_generic_allocate_tasks);
1731
1732/*
1733 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1734 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1735 */
1736int transport_generic_handle_cdb(
1737 struct se_cmd *cmd)
1738{
e3d6f909 1739 if (!cmd->se_lun) {
c66ac9db 1740 dump_stack();
6708bb27 1741 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1742 return -EINVAL;
c66ac9db 1743 }
695434e1 1744
c66ac9db
NB		 1745 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1746 return 0;
1747}
1748EXPORT_SYMBOL(transport_generic_handle_cdb);
1749
695434e1
NB		 1750/*
1751 * Used by fabric module frontends to queue tasks directly.
1752 * Many only be used from process context only
1753 */
1754int transport_handle_cdb_direct(
1755 struct se_cmd *cmd)
1756{
1757 if (!cmd->se_lun) {
1758 dump_stack();
6708bb27 1759 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1760 return -EINVAL;
1761 }
1762 if (in_interrupt()) {
1763 dump_stack();
6708bb27 1764 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1765 " from interrupt context\n");
1766 return -EINVAL;
1767 }
1768
1769 return transport_generic_new_cmd(cmd);
1770}
1771EXPORT_SYMBOL(transport_handle_cdb_direct);
1772
c66ac9db
NB		 1773/*
1774 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1775 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1776 * complete setup in TCM process context w/ TFO->new_cmd_map().
1777 */
1778int transport_generic_handle_cdb_map(
1779 struct se_cmd *cmd)
1780{
e3d6f909 1781 if (!cmd->se_lun) {
c66ac9db 1782 dump_stack();
6708bb27 1783 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1784 return -EINVAL;
c66ac9db
NB		 1785 }
1786
1787 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1788 return 0;
1789}
1790EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1791
1792/* transport_generic_handle_data():
1793 *
1794 *
1795 */
1796int transport_generic_handle_data(
1797 struct se_cmd *cmd)
1798{
1799 /*
1800 * For the software fabric case, then we assume the nexus is being
1801 * failed/shutdown when signals are pending from the kthread context
1802 * caller, so we return a failure. For the HW target mode case running
1803 * in interrupt code, the signal_pending() check is skipped.
1804 */
1805 if (!in_interrupt() && signal_pending(current))
e3d6f909 1806 return -EPERM;
c66ac9db
NB		 1807 /*
1808 * If the received CDB has aleady been ABORTED by the generic
1809 * target engine, we now call transport_check_aborted_status()
1810 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1811 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1812 * sequences at this point.
1813 */
1814 if (transport_check_aborted_status(cmd, 1) != 0)
1815 return 0;
1816
1817 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1818 return 0;
1819}
1820EXPORT_SYMBOL(transport_generic_handle_data);
1821
1822/* transport_generic_handle_tmr():
1823 *
1824 *
1825 */
1826int transport_generic_handle_tmr(
1827 struct se_cmd *cmd)
1828{
1829 /*
1830 * This is needed for early exceptions.
1831 */
1832 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
c66ac9db
NB		 1833
1834 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1835 return 0;
1836}
1837EXPORT_SYMBOL(transport_generic_handle_tmr);
1838
f4366772
NB		 1839void transport_generic_free_cmd_intr(
1840 struct se_cmd *cmd)
1841{
1842 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1843}
1844EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1845
c66ac9db
NB		 1846static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1847{
1848 struct se_task *task, *task_tmp;
1849 unsigned long flags;
1850 int ret = 0;
1851
6708bb27 1852 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1853 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1854
1855 /*
1856 * No tasks remain in the execution queue
1857 */
a1d8b49a 1858 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1859 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1860 &cmd->t_task_list, t_list) {
6708bb27 1861 pr_debug("task_no[%d] - Processing task %p\n",
c66ac9db
NB		 1862 task->task_no, task);
1863 /*
1864 * If the struct se_task has not been sent and is not active,
1865 * remove the struct se_task from the execution queue.
1866 */
1867 if (!atomic_read(&task->task_sent) &&
1868 !atomic_read(&task->task_active)) {
a1d8b49a 1869 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1870 flags);
1871 transport_remove_task_from_execute_queue(task,
1872 task->se_dev);
1873
6708bb27 1874 pr_debug("task_no[%d] - Removed from execute queue\n",
c66ac9db 1875 task->task_no);
a1d8b49a 1876 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1877 continue;
1878 }
1879
1880 /*
1881 * If the struct se_task is active, sleep until it is returned
1882 * from the plugin.
1883 */
1884 if (atomic_read(&task->task_active)) {
1885 atomic_set(&task->task_stop, 1);
a1d8b49a 1886 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1887 flags);
1888
6708bb27 1889 pr_debug("task_no[%d] - Waiting to complete\n",
c66ac9db
NB		 1890 task->task_no);
1891 wait_for_completion(&task->task_stop_comp);
6708bb27 1892 pr_debug("task_no[%d] - Stopped successfully\n",
c66ac9db
NB		 1893 task->task_no);
1894
a1d8b49a
AG		 1895 spin_lock_irqsave(&cmd->t_state_lock, flags);
1896 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 1897
1898 atomic_set(&task->task_active, 0);
1899 atomic_set(&task->task_stop, 0);
1900 } else {
6708bb27 1901 pr_debug("task_no[%d] - Did nothing\n", task->task_no);
c66ac9db
NB		 1902 ret++;
1903 }
1904
1905 __transport_stop_task_timer(task, &flags);
1906 }
a1d8b49a 1907 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1908
1909 return ret;
1910}
1911
c66ac9db
NB		 1912/*
1913 * Handle SAM-esque emulation for generic transport request failures.
1914 */
1915static void transport_generic_request_failure(
1916 struct se_cmd *cmd,
1917 struct se_device *dev,
1918 int complete,
1919 int sc)
1920{
07bde79a
NB		 1921 int ret = 0;
1922
6708bb27 1923 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1924 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1925 cmd->t_task_cdb[0]);
6708bb27 1926 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1927 " %d/%d transport_error_status: %d\n",
e3d6f909 1928 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1929 cmd->t_state, cmd->deferred_t_state,
1930 cmd->transport_error_status);
6708bb27 1931 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1932 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1933 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1934 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1935 atomic_read(&cmd->t_task_cdbs_left),
1936 atomic_read(&cmd->t_task_cdbs_sent),
1937 atomic_read(&cmd->t_task_cdbs_ex_left),
1938 atomic_read(&cmd->t_transport_active),
1939 atomic_read(&cmd->t_transport_stop),
1940 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 1941
1942 transport_stop_all_task_timers(cmd);
1943
1944 if (dev)
e3d6f909 1945 atomic_inc(&dev->depth_left);
c66ac9db
NB		 1946 /*
1947 * For SAM Task Attribute emulation for failed struct se_cmd
1948 */
1949 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1950 transport_complete_task_attr(cmd);
1951
1952 if (complete) {
1953 transport_direct_request_timeout(cmd);
1954 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1955 }
1956
1957 switch (cmd->transport_error_status) {
1958 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1959 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1960 break;
1961 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1962 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1963 break;
1964 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1965 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1966 break;
1967 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1968 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1969 break;
1970 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1971 if (!sc)
1972 transport_new_cmd_failure(cmd);
1973 /*
1974 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1975 * we force this session to fall back to session
1976 * recovery.
1977 */
e3d6f909
AG		 1978 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1979 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1980
1981 goto check_stop;
1982 case PYX_TRANSPORT_LU_COMM_FAILURE:
1983 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1984 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1985 break;
1986 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1987 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1988 break;
1989 case PYX_TRANSPORT_WRITE_PROTECTED:
1990 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1991 break;
1992 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1993 /*
1994 * No SENSE Data payload for this case, set SCSI Status
1995 * and queue the response to $FABRIC_MOD.
1996 *
1997 * Uses linux/include/scsi/scsi.h SAM status codes defs
1998 */
1999 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2000 /*
2001 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2002 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2003 * CONFLICT STATUS.
2004 *
2005 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2006 */
e3d6f909
AG		 2007 if (cmd->se_sess &&
2008 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2009 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2010 cmd->orig_fe_lun, 0x2C,
2011 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2012
07bde79a
NB		 2013 ret = cmd->se_tfo->queue_status(cmd);
2014 if (ret == -EAGAIN)
2015 goto queue_full;
c66ac9db
NB		 2016 goto check_stop;
2017 case PYX_TRANSPORT_USE_SENSE_REASON:
2018 /*
2019 * struct se_cmd->scsi_sense_reason already set
2020 */
2021 break;
2022 default:
6708bb27 2023 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 2024 cmd->t_task_cdb[0],
c66ac9db
NB		 2025 cmd->transport_error_status);
2026 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2027 break;
2028 }
2029
2030 if (!sc)
2031 transport_new_cmd_failure(cmd);
07bde79a
NB		 2032 else {
2033 ret = transport_send_check_condition_and_sense(cmd,
2034 cmd->scsi_sense_reason, 0);
2035 if (ret == -EAGAIN)
2036 goto queue_full;
2037 }
2038
c66ac9db
NB		 2039check_stop:
2040 transport_lun_remove_cmd(cmd);
6708bb27 2041 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2042 ;
07bde79a
NB		 2043 return;
2044
2045queue_full:
2046 cmd->t_state = TRANSPORT_COMPLETE_OK;
2047 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 2048}
2049
2050static void transport_direct_request_timeout(struct se_cmd *cmd)
2051{
2052 unsigned long flags;
2053
a1d8b49a 2054 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 2055 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 2056 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2057 return;
2058 }
a1d8b49a
AG		 2059 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2060 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2061 return;
2062 }
2063
a1d8b49a
AG		 2064 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2065 &cmd->t_se_count);
2066 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2067}
2068
2069static void transport_generic_request_timeout(struct se_cmd *cmd)
2070{
2071 unsigned long flags;
2072
2073 /*
a1d8b49a 2074 * Reset cmd->t_se_count to allow transport_generic_remove()
c66ac9db
NB		 2075 * to allow last call to free memory resources.
2076 */
a1d8b49a
AG		 2077 spin_lock_irqsave(&cmd->t_state_lock, flags);
2078 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2079 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2080
a1d8b49a 2081 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2082 }
a1d8b49a 2083 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2084
35462975 2085 transport_generic_remove(cmd, 0);
c66ac9db
NB		 2086}
2087
c66ac9db
NB		 2088static inline u32 transport_lba_21(unsigned char *cdb)
2089{
2090 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2091}
2092
2093static inline u32 transport_lba_32(unsigned char *cdb)
2094{
2095 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2096}
2097
2098static inline unsigned long long transport_lba_64(unsigned char *cdb)
2099{
2100 unsigned int __v1, __v2;
2101
2102 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2103 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2104
2105 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2106}
2107
2108/*
2109 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2110 */
2111static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2112{
2113 unsigned int __v1, __v2;
2114
2115 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2116 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2117
2118 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2119}
2120
2121static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2122{
2123 unsigned long flags;
2124
a1d8b49a 2125 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2126 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2127 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2128}
2129
2130/*
2131 * Called from interrupt context.
2132 */
2133static void transport_task_timeout_handler(unsigned long data)
2134{
2135 struct se_task *task = (struct se_task *)data;
e3d6f909 2136 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2137 unsigned long flags;
2138
6708bb27 2139 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2140
a1d8b49a 2141 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2142 if (task->task_flags & TF_STOP) {
a1d8b49a 2143 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2144 return;
2145 }
2146 task->task_flags &= ~TF_RUNNING;
2147
2148 /*
2149 * Determine if transport_complete_task() has already been called.
2150 */
6708bb27
AG		 2151 if (!atomic_read(&task->task_active)) {
2152 pr_debug("transport task: %p cmd: %p timeout task_active"
c66ac9db 2153 " == 0\n", task, cmd);
a1d8b49a 2154 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2155 return;
2156 }
2157
a1d8b49a
AG		 2158 atomic_inc(&cmd->t_se_count);
2159 atomic_inc(&cmd->t_transport_timeout);
2160 cmd->t_tasks_failed = 1;
c66ac9db
NB		 2161
2162 atomic_set(&task->task_timeout, 1);
2163 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2164 task->task_scsi_status = 1;
2165
2166 if (atomic_read(&task->task_stop)) {
6708bb27 2167 pr_debug("transport task: %p cmd: %p timeout task_stop"
c66ac9db 2168 " == 1\n", task, cmd);
a1d8b49a 2169 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2170 complete(&task->task_stop_comp);
2171 return;
2172 }
2173
6708bb27
AG		 2174 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2175 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2176 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2177 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2178 return;
2179 }
6708bb27 2180 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2181 task, cmd);
2182
2183 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2184 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2185
2186 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2187}
2188
2189/*
a1d8b49a 2190 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2191 */
2192static void transport_start_task_timer(struct se_task *task)
2193{
2194 struct se_device *dev = task->se_dev;
2195 int timeout;
2196
2197 if (task->task_flags & TF_RUNNING)
2198 return;
2199 /*
2200 * If the task_timeout is disabled, exit now.
2201 */
e3d6f909 2202 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2203 if (!timeout)
c66ac9db
NB		 2204 return;
2205
2206 init_timer(&task->task_timer);
2207 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2208 task->task_timer.data = (unsigned long) task;
2209 task->task_timer.function = transport_task_timeout_handler;
2210
2211 task->task_flags |= TF_RUNNING;
2212 add_timer(&task->task_timer);
2213#if 0
6708bb27 2214 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
c66ac9db
NB		 2215 " %d\n", task->task_se_cmd, task, timeout);
2216#endif
2217}
2218
2219/*
a1d8b49a 2220 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2221 */
2222void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2223{
e3d6f909 2224 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db 2225
6708bb27 2226 if (!task->task_flags & TF_RUNNING)
c66ac9db
NB		 2227 return;
2228
2229 task->task_flags |= TF_STOP;
a1d8b49a 2230 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2231
2232 del_timer_sync(&task->task_timer);
2233
a1d8b49a 2234 spin_lock_irqsave(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2235 task->task_flags &= ~TF_RUNNING;
2236 task->task_flags &= ~TF_STOP;
2237}
2238
2239static void transport_stop_all_task_timers(struct se_cmd *cmd)
2240{
2241 struct se_task *task = NULL, *task_tmp;
2242 unsigned long flags;
2243
a1d8b49a 2244 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2245 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2246 &cmd->t_task_list, t_list)
c66ac9db 2247 __transport_stop_task_timer(task, &flags);
a1d8b49a 2248 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2249}
2250
2251static inline int transport_tcq_window_closed(struct se_device *dev)
2252{
2253 if (dev->dev_tcq_window_closed++ <
2254 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2255 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2256 } else
2257 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2258
e3d6f909 2259 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2260 return 0;
2261}
2262
2263/*
2264 * Called from Fabric Module context from transport_execute_tasks()
2265 *
2266 * The return of this function determins if the tasks from struct se_cmd
2267 * get added to the execution queue in transport_execute_tasks(),
2268 * or are added to the delayed or ordered lists here.
2269 */
2270static inline int transport_execute_task_attr(struct se_cmd *cmd)
2271{
5951146d 2272 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2273 return 1;
2274 /*
25985edc 2275 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2276 * to allow the passed struct se_cmd list of tasks to the front of the list.
2277 */
e66ecd50 2278 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2279 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2280 smp_mb__after_atomic_inc();
6708bb27 2281 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2282 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2283 cmd->t_task_cdb[0],
c66ac9db
NB		 2284 cmd->se_ordered_id);
2285 return 1;
e66ecd50 2286 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2287 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2288 list_add_tail(&cmd->se_ordered_node,
2289 &cmd->se_dev->ordered_cmd_list);
2290 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2291
5951146d 2292 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2293 smp_mb__after_atomic_inc();
2294
6708bb27 2295 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2296 " list, se_ordered_id: %u\n",
a1d8b49a 2297 cmd->t_task_cdb[0],
c66ac9db
NB		 2298 cmd->se_ordered_id);
2299 /*
2300 * Add ORDERED command to tail of execution queue if
2301 * no other older commands exist that need to be
2302 * completed first.
2303 */
6708bb27 2304 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2305 return 1;
2306 } else {
2307 /*
2308 * For SIMPLE and UNTAGGED Task Attribute commands
2309 */
5951146d 2310 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2311 smp_mb__after_atomic_inc();
2312 }
2313 /*
2314 * Otherwise if one or more outstanding ORDERED task attribute exist,
2315 * add the dormant task(s) built for the passed struct se_cmd to the
2316 * execution queue and become in Active state for this struct se_device.
2317 */
5951146d 2318 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2319 /*
2320 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2321 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2322 */
5951146d 2323 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2324 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2325 list_add_tail(&cmd->se_delayed_node,
2326 &cmd->se_dev->delayed_cmd_list);
2327 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2328
6708bb27 2329 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2330 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2331 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2332 cmd->se_ordered_id);
2333 /*
2334 * Return zero to let transport_execute_tasks() know
2335 * not to add the delayed tasks to the execution list.
2336 */
2337 return 0;
2338 }
2339 /*
2340 * Otherwise, no ORDERED task attributes exist..
2341 */
2342 return 1;
2343}
2344
2345/*
2346 * Called from fabric module context in transport_generic_new_cmd() and
2347 * transport_generic_process_write()
2348 */
2349static int transport_execute_tasks(struct se_cmd *cmd)
2350{
2351 int add_tasks;
2352
db1620a2
CH		 2353 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2354 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2355 transport_generic_request_failure(cmd, NULL, 0, 1);
2356 return 0;
c66ac9db 2357 }
db1620a2 2358
c66ac9db
NB		 2359 /*
2360 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2361 * has occurred that prevents execution.
c66ac9db 2362 */
6708bb27 2363 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2364 /*
2365 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2366 * attribute for the tasks of the received struct se_cmd CDB
2367 */
2368 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2369 if (!add_tasks)
c66ac9db
NB		 2370 goto execute_tasks;
2371 /*
2372 * This calls transport_add_tasks_from_cmd() to handle
2373 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2374 * (if enabled) in __transport_add_task_to_execute_queue() and
2375 * transport_add_task_check_sam_attr().
2376 */
2377 transport_add_tasks_from_cmd(cmd);
2378 }
2379 /*
2380 * Kick the execution queue for the cmd associated struct se_device
2381 * storage object.
2382 */
2383execute_tasks:
5951146d 2384 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2385 return 0;
2386}
2387
2388/*
2389 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2390 * from struct se_device->execute_task_list and
2391 *
2392 * Called from transport_processing_thread()
2393 */
2394static int __transport_execute_tasks(struct se_device *dev)
2395{
2396 int error;
2397 struct se_cmd *cmd = NULL;
e3d6f909 2398 struct se_task *task = NULL;
c66ac9db
NB		 2399 unsigned long flags;
2400
2401 /*
2402 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2403 * struct se_tasks to the selected transport.
c66ac9db
NB		 2404 */
2405check_depth:
e3d6f909 2406 if (!atomic_read(&dev->depth_left))
c66ac9db 2407 return transport_tcq_window_closed(dev);
c66ac9db 2408
e3d6f909 2409 dev->dev_tcq_window_closed = 0;
c66ac9db 2410
e3d6f909
AG		 2411 spin_lock_irq(&dev->execute_task_lock);
2412 if (list_empty(&dev->execute_task_list)) {
2413 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2414 return 0;
2415 }
e3d6f909
AG		 2416 task = list_first_entry(&dev->execute_task_list,
2417 struct se_task, t_execute_list);
2418 list_del(&task->t_execute_list);
2419 atomic_set(&task->task_execute_queue, 0);
2420 atomic_dec(&dev->execute_tasks);
2421 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2422
2423 atomic_dec(&dev->depth_left);
c66ac9db 2424
e3d6f909 2425 cmd = task->task_se_cmd;
c66ac9db 2426
a1d8b49a 2427 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2428 atomic_set(&task->task_active, 1);
2429 atomic_set(&task->task_sent, 1);
a1d8b49a 2430 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2431
a1d8b49a
AG		 2432 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2433 cmd->t_task_list_num)
c66ac9db
NB		 2434 atomic_set(&cmd->transport_sent, 1);
2435
2436 transport_start_task_timer(task);
a1d8b49a 2437 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2438 /*
2439 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2440 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2441 * struct se_subsystem_api->do_task() caller below.
2442 */
2443 if (cmd->transport_emulate_cdb) {
2444 error = cmd->transport_emulate_cdb(cmd);
2445 if (error != 0) {
2446 cmd->transport_error_status = error;
2447 atomic_set(&task->task_active, 0);
2448 atomic_set(&cmd->transport_sent, 0);
2449 transport_stop_tasks_for_cmd(cmd);
2450 transport_generic_request_failure(cmd, dev, 0, 1);
2451 goto check_depth;
2452 }
2453 /*
2454 * Handle the successful completion for transport_emulate_cdb()
2455 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2456 * Otherwise the caller is expected to complete the task with
2457 * proper status.
2458 */
2459 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2460 cmd->scsi_status = SAM_STAT_GOOD;
2461 task->task_scsi_status = GOOD;
2462 transport_complete_task(task, 1);
2463 }
2464 } else {
2465 /*
2466 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2467 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2468 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2469 * LUN emulation code.
2470 *
2471 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2472 * call ->do_task() directly and let the underlying TCM subsystem plugin
2473 * code handle the CDB emulation.
2474 */
e3d6f909
AG		 2475 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2476 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2477 error = transport_emulate_control_cdb(task);
2478 else
e3d6f909 2479 error = dev->transport->do_task(task);
c66ac9db
NB		 2480
2481 if (error != 0) {
2482 cmd->transport_error_status = error;
2483 atomic_set(&task->task_active, 0);
2484 atomic_set(&cmd->transport_sent, 0);
2485 transport_stop_tasks_for_cmd(cmd);
2486 transport_generic_request_failure(cmd, dev, 0, 1);
2487 }
2488 }
2489
2490 goto check_depth;
2491
2492 return 0;
2493}
2494
2495void transport_new_cmd_failure(struct se_cmd *se_cmd)
2496{
2497 unsigned long flags;
2498 /*
2499 * Any unsolicited data will get dumped for failed command inside of
2500 * the fabric plugin
2501 */
a1d8b49a 2502 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2503 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2504 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2505 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2506}
2507
2508static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2509
2510static inline u32 transport_get_sectors_6(
2511 unsigned char *cdb,
2512 struct se_cmd *cmd,
2513 int *ret)
2514{
5951146d 2515 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2516
2517 /*
2518 * Assume TYPE_DISK for non struct se_device objects.
2519 * Use 8-bit sector value.
2520 */
2521 if (!dev)
2522 goto type_disk;
2523
2524 /*
2525 * Use 24-bit allocation length for TYPE_TAPE.
2526 */
e3d6f909 2527 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2528 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2529
2530 /*
2531 * Everything else assume TYPE_DISK Sector CDB location.
2532 * Use 8-bit sector value.
2533 */
2534type_disk:
2535 return (u32)cdb[4];
2536}
2537
2538static inline u32 transport_get_sectors_10(
2539 unsigned char *cdb,
2540 struct se_cmd *cmd,
2541 int *ret)
2542{
5951146d 2543 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2544
2545 /*
2546 * Assume TYPE_DISK for non struct se_device objects.
2547 * Use 16-bit sector value.
2548 */
2549 if (!dev)
2550 goto type_disk;
2551
2552 /*
2553 * XXX_10 is not defined in SSC, throw an exception
2554 */
e3d6f909
AG		 2555 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2556 *ret = -EINVAL;
c66ac9db
NB		 2557 return 0;
2558 }
2559
2560 /*
2561 * Everything else assume TYPE_DISK Sector CDB location.
2562 * Use 16-bit sector value.
2563 */
2564type_disk:
2565 return (u32)(cdb[7] << 8) + cdb[8];
2566}
2567
2568static inline u32 transport_get_sectors_12(
2569 unsigned char *cdb,
2570 struct se_cmd *cmd,
2571 int *ret)
2572{
5951146d 2573 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2574
2575 /*
2576 * Assume TYPE_DISK for non struct se_device objects.
2577 * Use 32-bit sector value.
2578 */
2579 if (!dev)
2580 goto type_disk;
2581
2582 /*
2583 * XXX_12 is not defined in SSC, throw an exception
2584 */
e3d6f909
AG		 2585 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2586 *ret = -EINVAL;
c66ac9db
NB		 2587 return 0;
2588 }
2589
2590 /*
2591 * Everything else assume TYPE_DISK Sector CDB location.
2592 * Use 32-bit sector value.
2593 */
2594type_disk:
2595 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2596}
2597
2598static inline u32 transport_get_sectors_16(
2599 unsigned char *cdb,
2600 struct se_cmd *cmd,
2601 int *ret)
2602{
5951146d 2603 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2604
2605 /*
2606 * Assume TYPE_DISK for non struct se_device objects.
2607 * Use 32-bit sector value.
2608 */
2609 if (!dev)
2610 goto type_disk;
2611
2612 /*
2613 * Use 24-bit allocation length for TYPE_TAPE.
2614 */
e3d6f909 2615 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2616 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2617
2618type_disk:
2619 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2620 (cdb[12] << 8) + cdb[13];
2621}
2622
2623/*
2624 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2625 */
2626static inline u32 transport_get_sectors_32(
2627 unsigned char *cdb,
2628 struct se_cmd *cmd,
2629 int *ret)
2630{
2631 /*
2632 * Assume TYPE_DISK for non struct se_device objects.
2633 * Use 32-bit sector value.
2634 */
2635 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2636 (cdb[30] << 8) + cdb[31];
2637
2638}
2639
2640static inline u32 transport_get_size(
2641 u32 sectors,
2642 unsigned char *cdb,
2643 struct se_cmd *cmd)
2644{
5951146d 2645 struct se_device *dev = cmd->se_dev;
c66ac9db 2646
e3d6f909 2647 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2648 if (cdb[1] & 1) { /* sectors */
e3d6f909 2649 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2650 } else /* bytes */
2651 return sectors;
2652 }
2653#if 0
6708bb27 2654 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2655 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2656 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2657 dev->transport->name);
c66ac9db 2658#endif
e3d6f909 2659 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2660}
2661
c66ac9db
NB		 2662static void transport_xor_callback(struct se_cmd *cmd)
2663{
2664 unsigned char *buf, *addr;
ec98f782 2665 struct scatterlist *sg;
c66ac9db
NB		 2666 unsigned int offset;
2667 int i;
ec98f782 2668 int count;
c66ac9db
NB		 2669 /*
2670 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2671 *
2672 * 1) read the specified logical block(s);
2673 * 2) transfer logical blocks from the data-out buffer;
2674 * 3) XOR the logical blocks transferred from the data-out buffer with
2675 * the logical blocks read, storing the resulting XOR data in a buffer;
2676 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2677 * blocks transferred from the data-out buffer; and
2678 * 5) transfer the resulting XOR data to the data-in buffer.
2679 */
2680 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2681 if (!buf) {
2682 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2683 return;
2684 }
2685 /*
ec98f782 2686 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2687 * into the locally allocated *buf
2688 */
ec98f782
AG		 2689 sg_copy_to_buffer(cmd->t_data_sg,
2690 cmd->t_data_nents,
2691 buf,
2692 cmd->data_length);
2693
c66ac9db
NB		 2694 /*
2695 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2696 * cmd->t_mem_bidi_list
c66ac9db
NB		 2697 */
2698
2699 offset = 0;
ec98f782
AG		 2700 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2701 addr = kmap_atomic(sg_page(sg), KM_USER0);
2702 if (!addr)
c66ac9db
NB		 2703 goto out;
2704
ec98f782
AG		 2705 for (i = 0; i < sg->length; i++)
2706 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2707
ec98f782 2708 offset += sg->length;
c66ac9db
NB		 2709 kunmap_atomic(addr, KM_USER0);
2710 }
ec98f782 2711
c66ac9db
NB		 2712out:
2713 kfree(buf);
2714}
2715
2716/*
2717 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2718 */
2719static int transport_get_sense_data(struct se_cmd *cmd)
2720{
2721 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2722 struct se_device *dev;
2723 struct se_task *task = NULL, *task_tmp;
2724 unsigned long flags;
2725 u32 offset = 0;
2726
e3d6f909
AG		 2727 WARN_ON(!cmd->se_lun);
2728
a1d8b49a 2729 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2730 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2731 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2732 return 0;
2733 }
2734
2735 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2736 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2737
2738 if (!task->task_sense)
2739 continue;
2740
2741 dev = task->se_dev;
6708bb27 2742 if (!dev)
c66ac9db
NB		 2743 continue;
2744
e3d6f909 2745 if (!dev->transport->get_sense_buffer) {
6708bb27 2746 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2747 " is NULL\n");
2748 continue;
2749 }
2750
e3d6f909 2751 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27
AG		 2752 if (!sense_buffer) {
2753 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
c66ac9db 2754 " sense buffer for task with sense\n",
e3d6f909 2755 cmd->se_tfo->get_task_tag(cmd), task->task_no);
c66ac9db
NB		 2756 continue;
2757 }
a1d8b49a 2758 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2759
e3d6f909 2760 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2761 TRANSPORT_SENSE_BUFFER);
2762
5951146d 2763 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2764 TRANSPORT_SENSE_BUFFER);
2765 cmd->scsi_status = task->task_scsi_status;
2766 /* Automatically padded */
2767 cmd->scsi_sense_length =
2768 (TRANSPORT_SENSE_BUFFER + offset);
2769
6708bb27 2770 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2771 " and sense\n",
e3d6f909 2772 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2773 cmd->scsi_status);
2774 return 0;
2775 }
a1d8b49a 2776 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2777
2778 return -1;
2779}
2780
c66ac9db
NB		 2781static int
2782transport_handle_reservation_conflict(struct se_cmd *cmd)
2783{
2784 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2785 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2786 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2787 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2788 /*
2789 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2790 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2791 * CONFLICT STATUS.
2792 *
2793 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2794 */
e3d6f909
AG		 2795 if (cmd->se_sess &&
2796 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2797 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2798 cmd->orig_fe_lun, 0x2C,
2799 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2800 return -EINVAL;
c66ac9db
NB		 2801}
2802
ec98f782
AG		 2803static inline long long transport_dev_end_lba(struct se_device *dev)
2804{
2805 return dev->transport->get_blocks(dev) + 1;
2806}
2807
2808static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2809{
2810 struct se_device *dev = cmd->se_dev;
2811 u32 sectors;
2812
2813 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2814 return 0;
2815
2816 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2817
6708bb27
AG		 2818 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2819 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2820 " transport_dev_end_lba(): %llu\n",
2821 cmd->t_task_lba, sectors,
2822 transport_dev_end_lba(dev));
6708bb27 2823 pr_err(" We should return CHECK_CONDITION"
ec98f782
AG		 2824 " but we don't yet\n");
2825 return 0;
2826 }
2827
2828 return sectors;
2829}
2830
c66ac9db
NB		 2831/* transport_generic_cmd_sequencer():
2832 *
2833 * Generic Command Sequencer that should work for most DAS transport
2834 * drivers.
2835 *
2836 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2837 * RX Thread.
2838 *
2839 * FIXME: Need to support other SCSI OPCODES where as well.
2840 */
2841static int transport_generic_cmd_sequencer(
2842 struct se_cmd *cmd,
2843 unsigned char *cdb)
2844{
5951146d 2845 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2846 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2847 int ret = 0, sector_ret = 0, passthrough;
2848 u32 sectors = 0, size = 0, pr_reg_type = 0;
2849 u16 service_action;
2850 u8 alua_ascq = 0;
2851 /*
2852 * Check for an existing UNIT ATTENTION condition
2853 */
2854 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2855 cmd->transport_wait_for_tasks =
2856 &transport_nop_wait_for_tasks;
2857 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2858 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2859 return -EINVAL;
c66ac9db
NB		 2860 }
2861 /*
2862 * Check status of Asymmetric Logical Unit Assignment port
2863 */
e3d6f909 2864 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db
NB		 2865 if (ret != 0) {
2866 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2867 /*
25985edc 2868 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2869 * The ALUA additional sense code qualifier (ASCQ) is determined
2870 * by the ALUA primary or secondary access state..
2871 */
2872 if (ret > 0) {
2873#if 0
6708bb27 2874 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2875 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2876 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2877#endif
2878 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2879 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2880 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2881 return -EINVAL;
c66ac9db
NB		 2882 }
2883 goto out_invalid_cdb_field;
2884 }
2885 /*
2886 * Check status for SPC-3 Persistent Reservations
2887 */
e3d6f909
AG		 2888 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2889 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2890 cmd, cdb, pr_reg_type) != 0)
2891 return transport_handle_reservation_conflict(cmd);
2892 /*
2893 * This means the CDB is allowed for the SCSI Initiator port
2894 * when said port is *NOT* holding the legacy SPC-2 or
2895 * SPC-3 Persistent Reservation.
2896 */
2897 }
2898
2899 switch (cdb[0]) {
2900 case READ_6:
2901 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2902 if (sector_ret)
2903 goto out_unsupported_cdb;
2904 size = transport_get_size(sectors, cdb, cmd);
2905 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2906 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2907 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2908 break;
2909 case READ_10:
2910 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2911 if (sector_ret)
2912 goto out_unsupported_cdb;
2913 size = transport_get_size(sectors, cdb, cmd);
2914 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 2915 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2916 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2917 break;
2918 case READ_12:
2919 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2920 if (sector_ret)
2921 goto out_unsupported_cdb;
2922 size = transport_get_size(sectors, cdb, cmd);
2923 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a 2924 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2925 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2926 break;
2927 case READ_16:
2928 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2929 if (sector_ret)
2930 goto out_unsupported_cdb;
2931 size = transport_get_size(sectors, cdb, cmd);
2932 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a 2933 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2934 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2935 break;
2936 case WRITE_6:
2937 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2938 if (sector_ret)
2939 goto out_unsupported_cdb;
2940 size = transport_get_size(sectors, cdb, cmd);
2941 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2942 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2943 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2944 break;
2945 case WRITE_10:
2946 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2947 if (sector_ret)
2948 goto out_unsupported_cdb;
2949 size = transport_get_size(sectors, cdb, cmd);
2950 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a
AG		 2951 cmd->t_task_lba = transport_lba_32(cdb);
2952 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2953 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2954 break;
2955 case WRITE_12:
2956 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2957 if (sector_ret)
2958 goto out_unsupported_cdb;
2959 size = transport_get_size(sectors, cdb, cmd);
2960 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a
AG		 2961 cmd->t_task_lba = transport_lba_32(cdb);
2962 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2963 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2964 break;
2965 case WRITE_16:
2966 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2967 if (sector_ret)
2968 goto out_unsupported_cdb;
2969 size = transport_get_size(sectors, cdb, cmd);
2970 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a
AG		 2971 cmd->t_task_lba = transport_lba_64(cdb);
2972 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2973 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2974 break;
2975 case XDWRITEREAD_10:
2976 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2977 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2978 goto out_invalid_cdb_field;
2979 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2980 if (sector_ret)
2981 goto out_unsupported_cdb;
2982 size = transport_get_size(sectors, cdb, cmd);
2983 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 2984 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2985 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 2986 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2987 TRANSPORT_PLUGIN_PHBA_PDEV);
2988 /*
2989 * Skip the remaining assignments for TCM/PSCSI passthrough
2990 */
2991 if (passthrough)
2992 break;
2993 /*
2994 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2995 */
2996 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2997 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2998 break;
2999 case VARIABLE_LENGTH_CMD:
3000 service_action = get_unaligned_be16(&cdb[8]);
3001 /*
3002 * Determine if this is TCM/PSCSI device and we should disable
3003 * internal emulation for this CDB.
3004 */
e3d6f909 3005 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3006 TRANSPORT_PLUGIN_PHBA_PDEV);
3007
3008 switch (service_action) {
3009 case XDWRITEREAD_32:
3010 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3011 if (sector_ret)
3012 goto out_unsupported_cdb;
3013 size = transport_get_size(sectors, cdb, cmd);
3014 /*
3015 * Use WRITE_32 and READ_32 opcodes for the emulated
3016 * XDWRITE_READ_32 logic.
3017 */
3018 cmd->transport_split_cdb = &split_cdb_XX_32;
a1d8b49a 3019 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 3020 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3021
3022 /*
3023 * Skip the remaining assignments for TCM/PSCSI passthrough
3024 */
3025 if (passthrough)
3026 break;
3027
3028 /*
3029 * Setup BIDI XOR callback to be run during
3030 * transport_generic_complete_ok()
3031 */
3032 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3033 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 3034 break;
3035 case WRITE_SAME_32:
3036 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3037 if (sector_ret)
3038 goto out_unsupported_cdb;
dd3a5ad8 3039
6708bb27 3040 if (sectors)
dd3a5ad8 3041 size = transport_get_size(sectors, cdb, cmd);
6708bb27
AG		 3042 else {
3043 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3044 " supported\n");
3045 goto out_invalid_cdb_field;
3046 }
dd3a5ad8 3047
a1d8b49a 3048 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 3049 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3050
3051 /*
3052 * Skip the remaining assignments for TCM/PSCSI passthrough
3053 */
3054 if (passthrough)
3055 break;
3056
3057 if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
6708bb27 3058 pr_err("WRITE_SAME PBDATA and LBDATA"
c66ac9db
NB		 3059 " bits not supported for Block Discard"
3060 " Emulation\n");
3061 goto out_invalid_cdb_field;
3062 }
3063 /*
3064 * Currently for the emulated case we only accept
3065 * tpws with the UNMAP=1 bit set.
3066 */
3067 if (!(cdb[10] & 0x08)) {
6708bb27 3068 pr_err("WRITE_SAME w/o UNMAP bit not"
c66ac9db
NB		 3069 " supported for Block Discard Emulation\n");
3070 goto out_invalid_cdb_field;
3071 }
3072 break;
3073 default:
6708bb27 3074 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 3075 " 0x%04x not supported\n", service_action);
3076 goto out_unsupported_cdb;
3077 }
3078 break;
e434f1f1 3079 case MAINTENANCE_IN:
e3d6f909 3080 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3081 /* MAINTENANCE_IN from SCC-2 */
3082 /*
3083 * Check for emulated MI_REPORT_TARGET_PGS.
3084 */
3085 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3086 cmd->transport_emulate_cdb =
e3d6f909 3087 (su_dev->t10_alua.alua_type ==
c66ac9db 3088 SPC3_ALUA_EMULATED) ?
e3d6f909 3089 core_emulate_report_target_port_groups :
c66ac9db
NB		 3090 NULL;
3091 }
3092 size = (cdb[6] << 24) | (cdb[7] << 16) |
3093 (cdb[8] << 8) | cdb[9];
3094 } else {
3095 /* GPCMD_SEND_KEY from multi media commands */
3096 size = (cdb[8] << 8) + cdb[9];
3097 }
05d1c7c0 3098 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3099 break;
3100 case MODE_SELECT:
3101 size = cdb[4];
3102 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3103 break;
3104 case MODE_SELECT_10:
3105 size = (cdb[7] << 8) + cdb[8];
3106 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3107 break;
3108 case MODE_SENSE:
3109 size = cdb[4];
05d1c7c0 3110 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3111 break;
3112 case MODE_SENSE_10:
3113 case GPCMD_READ_BUFFER_CAPACITY:
3114 case GPCMD_SEND_OPC:
3115 case LOG_SELECT:
3116 case LOG_SENSE:
3117 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3118 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3119 break;
3120 case READ_BLOCK_LIMITS:
3121 size = READ_BLOCK_LEN;
05d1c7c0 3122 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3123 break;
3124 case GPCMD_GET_CONFIGURATION:
3125 case GPCMD_READ_FORMAT_CAPACITIES:
3126 case GPCMD_READ_DISC_INFO:
3127 case GPCMD_READ_TRACK_RZONE_INFO:
3128 size = (cdb[7] << 8) + cdb[8];
3129 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3130 break;
3131 case PERSISTENT_RESERVE_IN:
3132 case PERSISTENT_RESERVE_OUT:
3133 cmd->transport_emulate_cdb =
e3d6f909 3134 (su_dev->t10_pr.res_type ==
c66ac9db 3135 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3136 core_scsi3_emulate_pr : NULL;
c66ac9db 3137 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3138 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3139 break;
3140 case GPCMD_MECHANISM_STATUS:
3141 case GPCMD_READ_DVD_STRUCTURE:
3142 size = (cdb[8] << 8) + cdb[9];
3143 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3144 break;
3145 case READ_POSITION:
3146 size = READ_POSITION_LEN;
05d1c7c0 3147 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3148 break;
e434f1f1 3149 case MAINTENANCE_OUT:
e3d6f909 3150 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3151 /* MAINTENANCE_OUT from SCC-2
3152 *
3153 * Check for emulated MO_SET_TARGET_PGS.
3154 */
3155 if (cdb[1] == MO_SET_TARGET_PGS) {
3156 cmd->transport_emulate_cdb =
e3d6f909 3157 (su_dev->t10_alua.alua_type ==
c66ac9db 3158 SPC3_ALUA_EMULATED) ?
e3d6f909 3159 core_emulate_set_target_port_groups :
c66ac9db
NB		 3160 NULL;
3161 }
3162
3163 size = (cdb[6] << 24) | (cdb[7] << 16) |
3164 (cdb[8] << 8) | cdb[9];
3165 } else {
3166 /* GPCMD_REPORT_KEY from multi media commands */
3167 size = (cdb[8] << 8) + cdb[9];
3168 }
05d1c7c0 3169 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3170 break;
3171 case INQUIRY:
3172 size = (cdb[3] << 8) + cdb[4];
3173 /*
3174 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3175 * See spc4r17 section 5.3
3176 */
5951146d 3177 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3178 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3179 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3180 break;
3181 case READ_BUFFER:
3182 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3183 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3184 break;
3185 case READ_CAPACITY:
3186 size = READ_CAP_LEN;
05d1c7c0 3187 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3188 break;
3189 case READ_MEDIA_SERIAL_NUMBER:
3190 case SECURITY_PROTOCOL_IN:
3191 case SECURITY_PROTOCOL_OUT:
3192 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3193 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3194 break;
3195 case SERVICE_ACTION_IN:
3196 case ACCESS_CONTROL_IN:
3197 case ACCESS_CONTROL_OUT:
3198 case EXTENDED_COPY:
3199 case READ_ATTRIBUTE:
3200 case RECEIVE_COPY_RESULTS:
3201 case WRITE_ATTRIBUTE:
3202 size = (cdb[10] << 24) | (cdb[11] << 16) |
3203 (cdb[12] << 8) | cdb[13];
05d1c7c0 3204 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3205 break;
3206 case RECEIVE_DIAGNOSTIC:
3207 case SEND_DIAGNOSTIC:
3208 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3209 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3210 break;
3211/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3212#if 0
3213 case GPCMD_READ_CD:
3214 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3215 size = (2336 * sectors);
05d1c7c0 3216 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3217 break;
3218#endif
3219 case READ_TOC:
3220 size = cdb[8];
05d1c7c0 3221 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3222 break;
3223 case REQUEST_SENSE:
3224 size = cdb[4];
05d1c7c0 3225 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3226 break;
3227 case READ_ELEMENT_STATUS:
3228 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3229 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3230 break;
3231 case WRITE_BUFFER:
3232 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3233 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3234 break;
3235 case RESERVE:
3236 case RESERVE_10:
3237 /*
3238 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3239 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3240 */
3241 if (cdb[0] == RESERVE_10)
3242 size = (cdb[7] << 8) | cdb[8];
3243 else
3244 size = cmd->data_length;
3245
3246 /*
3247 * Setup the legacy emulated handler for SPC-2 and
3248 * >= SPC-3 compatible reservation handling (CRH=1)
3249 * Otherwise, we assume the underlying SCSI logic is
3250 * is running in SPC_PASSTHROUGH, and wants reservations
3251 * emulation disabled.
3252 */
3253 cmd->transport_emulate_cdb =
e3d6f909 3254 (su_dev->t10_pr.res_type !=
c66ac9db 3255 SPC_PASSTHROUGH) ?
e3d6f909 3256 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3257 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3258 break;
3259 case RELEASE:
3260 case RELEASE_10:
3261 /*
3262 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3263 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3264 */
3265 if (cdb[0] == RELEASE_10)
3266 size = (cdb[7] << 8) | cdb[8];
3267 else
3268 size = cmd->data_length;
3269
3270 cmd->transport_emulate_cdb =
e3d6f909 3271 (su_dev->t10_pr.res_type !=
c66ac9db 3272 SPC_PASSTHROUGH) ?
e3d6f909 3273 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3274 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3275 break;
3276 case SYNCHRONIZE_CACHE:
3277 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3278 /*
3279 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3280 */
3281 if (cdb[0] == SYNCHRONIZE_CACHE) {
3282 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3283 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3284 } else {
3285 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3286 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3287 }
3288 if (sector_ret)
3289 goto out_unsupported_cdb;
3290
3291 size = transport_get_size(sectors, cdb, cmd);
3292 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3293
3294 /*
3295 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3296 */
e3d6f909 3297 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3298 break;
3299 /*
3300 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3301 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3302 */
3303 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3304 /*
3305 * Check to ensure that LBA + Range does not exceed past end of
3306 * device.
3307 */
a1d8b49a 3308 if (!transport_cmd_get_valid_sectors(cmd))
c66ac9db
NB		 3309 goto out_invalid_cdb_field;
3310 break;
3311 case UNMAP:
3312 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3313 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3314 break;
3315 case WRITE_SAME_16:
3316 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3317 if (sector_ret)
3318 goto out_unsupported_cdb;
dd3a5ad8 3319
6708bb27 3320 if (sectors)
dd3a5ad8 3321 size = transport_get_size(sectors, cdb, cmd);
6708bb27
AG		 3322 else {
3323 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3324 goto out_invalid_cdb_field;
3325 }
dd3a5ad8 3326
a1d8b49a 3327 cmd->t_task_lba = get_unaligned_be16(&cdb[2]);
e3d6f909 3328 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3329 TRANSPORT_PLUGIN_PHBA_PDEV);
3330 /*
3331 * Determine if the received WRITE_SAME_16 is used to for direct
3332 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3333 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3334 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3335 * TCM/FILEIO subsystem plugin backstores.
3336 */
6708bb27 3337 if (!passthrough) {
c66ac9db 3338 if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
6708bb27 3339 pr_err("WRITE_SAME PBDATA and LBDATA"
c66ac9db
NB		 3340 " bits not supported for Block Discard"
3341 " Emulation\n");
3342 goto out_invalid_cdb_field;
3343 }
3344 /*
3345 * Currently for the emulated case we only accept
3346 * tpws with the UNMAP=1 bit set.
3347 */
3348 if (!(cdb[1] & 0x08)) {
6708bb27 3349 pr_err("WRITE_SAME w/o UNMAP bit not "
c66ac9db
NB		 3350 " supported for Block Discard Emulation\n");
3351 goto out_invalid_cdb_field;
3352 }
3353 }
3354 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3355 break;
3356 case ALLOW_MEDIUM_REMOVAL:
3357 case GPCMD_CLOSE_TRACK:
3358 case ERASE:
3359 case INITIALIZE_ELEMENT_STATUS:
3360 case GPCMD_LOAD_UNLOAD:
3361 case REZERO_UNIT:
3362 case SEEK_10:
3363 case GPCMD_SET_SPEED:
3364 case SPACE:
3365 case START_STOP:
3366 case TEST_UNIT_READY:
3367 case VERIFY:
3368 case WRITE_FILEMARKS:
3369 case MOVE_MEDIUM:
3370 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3371 break;
3372 case REPORT_LUNS:
3373 cmd->transport_emulate_cdb =
e3d6f909 3374 transport_core_report_lun_response;
c66ac9db
NB		 3375 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3376 /*
3377 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3378 * See spc4r17 section 5.3
3379 */
5951146d 3380 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3381 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3382 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3383 break;
3384 default:
6708bb27 3385 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3386 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3387 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3388 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3389 goto out_unsupported_cdb;
3390 }
3391
3392 if (size != cmd->data_length) {
6708bb27 3393 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3394 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3395 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3396 cmd->data_length, size, cdb[0]);
3397
3398 cmd->cmd_spdtl = size;
3399
3400 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3401 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3402 " WRITE data\n");
3403 goto out_invalid_cdb_field;
3404 }
3405 /*
3406 * Reject READ_* or WRITE_* with overflow/underflow for
3407 * type SCF_SCSI_DATA_SG_IO_CDB.
3408 */
6708bb27
AG		 3409 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3410 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3411 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3412 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3413 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3414 goto out_invalid_cdb_field;
3415 }
3416
3417 if (size > cmd->data_length) {
3418 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3419 cmd->residual_count = (size - cmd->data_length);
3420 } else {
3421 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3422 cmd->residual_count = (cmd->data_length - size);
3423 }
3424 cmd->data_length = size;
3425 }
3426
d0229ae3
AG		 3427 /* Let's limit control cdbs to a page, for simplicity's sake. */
3428 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3429 size > PAGE_SIZE)
3430 goto out_invalid_cdb_field;
3431
c66ac9db
NB		 3432 transport_set_supported_SAM_opcode(cmd);
3433 return ret;
3434
3435out_unsupported_cdb:
3436 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3437 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3438 return -EINVAL;
c66ac9db
NB		 3439out_invalid_cdb_field:
3440 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3441 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3442 return -EINVAL;
c66ac9db
NB		 3443}
3444
c66ac9db
NB		 3445/*
3446 * Called from transport_generic_complete_ok() and
3447 * transport_generic_request_failure() to determine which dormant/delayed
3448 * and ordered cmds need to have their tasks added to the execution queue.
3449 */
3450static void transport_complete_task_attr(struct se_cmd *cmd)
3451{
5951146d 3452 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3453 struct se_cmd *cmd_p, *cmd_tmp;
3454 int new_active_tasks = 0;
3455
e66ecd50 3456 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3457 atomic_dec(&dev->simple_cmds);
3458 smp_mb__after_atomic_dec();
3459 dev->dev_cur_ordered_id++;
6708bb27 3460 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3461 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3462 cmd->se_ordered_id);
e66ecd50 3463 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3464 atomic_dec(&dev->dev_hoq_count);
3465 smp_mb__after_atomic_dec();
3466 dev->dev_cur_ordered_id++;
6708bb27 3467 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3468 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3469 cmd->se_ordered_id);
e66ecd50 3470 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3471 spin_lock(&dev->ordered_cmd_lock);
5951146d 3472 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3473 atomic_dec(&dev->dev_ordered_sync);
3474 smp_mb__after_atomic_dec();
3475 spin_unlock(&dev->ordered_cmd_lock);
3476
3477 dev->dev_cur_ordered_id++;
6708bb27 3478 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3479 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3480 }
3481 /*
3482 * Process all commands up to the last received
3483 * ORDERED task attribute which requires another blocking
3484 * boundary
3485 */
3486 spin_lock(&dev->delayed_cmd_lock);
3487 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3488 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3489
5951146d 3490 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3491 spin_unlock(&dev->delayed_cmd_lock);
3492
6708bb27 3493 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3494 " cmd_p: 0x%02x Task Attr: 0x%02x"
3495 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3496 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3497 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3498
3499 transport_add_tasks_from_cmd(cmd_p);
3500 new_active_tasks++;
3501
3502 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3503 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3504 break;
3505 }
3506 spin_unlock(&dev->delayed_cmd_lock);
3507 /*
3508 * If new tasks have become active, wake up the transport thread
3509 * to do the processing of the Active tasks.
3510 */
3511 if (new_active_tasks != 0)
e3d6f909 3512 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3513}
3514
07bde79a
NB		 3515static int transport_complete_qf(struct se_cmd *cmd)
3516{
3517 int ret = 0;
3518
3519 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3520 return cmd->se_tfo->queue_status(cmd);
3521
3522 switch (cmd->data_direction) {
3523 case DMA_FROM_DEVICE:
3524 ret = cmd->se_tfo->queue_data_in(cmd);
3525 break;
3526 case DMA_TO_DEVICE:
ec98f782 3527 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3528 ret = cmd->se_tfo->queue_data_in(cmd);
3529 if (ret < 0)
3530 return ret;
3531 }
3532 /* Fall through for DMA_TO_DEVICE */
3533 case DMA_NONE:
3534 ret = cmd->se_tfo->queue_status(cmd);
3535 break;
3536 default:
3537 break;
3538 }
3539
3540 return ret;
3541}
3542
3543static void transport_handle_queue_full(
3544 struct se_cmd *cmd,
3545 struct se_device *dev,
3546 int (*qf_callback)(struct se_cmd *))
3547{
3548 spin_lock_irq(&dev->qf_cmd_lock);
3549 cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3550 cmd->transport_qf_callback = qf_callback;
3551 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3552 atomic_inc(&dev->dev_qf_count);
3553 smp_mb__after_atomic_inc();
3554 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3555
3556 schedule_work(&cmd->se_dev->qf_work_queue);
3557}
3558
c66ac9db
NB		 3559static void transport_generic_complete_ok(struct se_cmd *cmd)
3560{
07bde79a 3561 int reason = 0, ret;
c66ac9db
NB		 3562 /*
3563 * Check if we need to move delayed/dormant tasks from cmds on the
3564 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3565 * Attribute.
3566 */
5951146d 3567 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3568 transport_complete_task_attr(cmd);
07bde79a
NB		 3569 /*
3570 * Check to schedule QUEUE_FULL work, or execute an existing
3571 * cmd->transport_qf_callback()
3572 */
3573 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3574 schedule_work(&cmd->se_dev->qf_work_queue);
3575
3576 if (cmd->transport_qf_callback) {
3577 ret = cmd->transport_qf_callback(cmd);
3578 if (ret < 0)
3579 goto queue_full;
3580
3581 cmd->transport_qf_callback = NULL;
3582 goto done;
3583 }
c66ac9db
NB		 3584 /*
3585 * Check if we need to retrieve a sense buffer from
3586 * the struct se_cmd in question.
3587 */
3588 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3589 if (transport_get_sense_data(cmd) < 0)
3590 reason = TCM_NON_EXISTENT_LUN;
3591
3592 /*
3593 * Only set when an struct se_task->task_scsi_status returned
3594 * a non GOOD status.
3595 */
3596 if (cmd->scsi_status) {
07bde79a 3597 ret = transport_send_check_condition_and_sense(
c66ac9db 3598 cmd, reason, 1);
07bde79a
NB		 3599 if (ret == -EAGAIN)
3600 goto queue_full;
3601
c66ac9db
NB		 3602 transport_lun_remove_cmd(cmd);
3603 transport_cmd_check_stop_to_fabric(cmd);
3604 return;
3605 }
3606 }
3607 /*
25985edc 3608 * Check for a callback, used by amongst other things
c66ac9db
NB		 3609 * XDWRITE_READ_10 emulation.
3610 */
3611 if (cmd->transport_complete_callback)
3612 cmd->transport_complete_callback(cmd);
3613
3614 switch (cmd->data_direction) {
3615 case DMA_FROM_DEVICE:
3616 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3617 if (cmd->se_lun->lun_sep) {
3618 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3619 cmd->data_length;
3620 }
3621 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3622
07bde79a
NB		 3623 ret = cmd->se_tfo->queue_data_in(cmd);
3624 if (ret == -EAGAIN)
3625 goto queue_full;
c66ac9db
NB		 3626 break;
3627 case DMA_TO_DEVICE:
3628 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3629 if (cmd->se_lun->lun_sep) {
3630 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3631 cmd->data_length;
3632 }
3633 spin_unlock(&cmd->se_lun->lun_sep_lock);
3634 /*
3635 * Check if we need to send READ payload for BIDI-COMMAND
3636 */
ec98f782 3637 if (cmd->t_bidi_data_sg) {
c66ac9db 3638 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3639 if (cmd->se_lun->lun_sep) {
3640 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3641 cmd->data_length;
3642 }
3643 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3644 ret = cmd->se_tfo->queue_data_in(cmd);
3645 if (ret == -EAGAIN)
3646 goto queue_full;
c66ac9db
NB		 3647 break;
3648 }
3649 /* Fall through for DMA_TO_DEVICE */
3650 case DMA_NONE:
07bde79a
NB		 3651 ret = cmd->se_tfo->queue_status(cmd);
3652 if (ret == -EAGAIN)
3653 goto queue_full;
c66ac9db
NB		 3654 break;
3655 default:
3656 break;
3657 }
3658
07bde79a 3659done:
c66ac9db
NB		 3660 transport_lun_remove_cmd(cmd);
3661 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3662 return;
3663
3664queue_full:
6708bb27 3665 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a
NB		 3666 " data_direction: %d\n", cmd, cmd->data_direction);
3667 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 3668}
3669
3670static void transport_free_dev_tasks(struct se_cmd *cmd)
3671{
3672 struct se_task *task, *task_tmp;
3673 unsigned long flags;
3674
a1d8b49a 3675 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3676 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3677 &cmd->t_task_list, t_list) {
c66ac9db
NB		 3678 if (atomic_read(&task->task_active))
3679 continue;
3680
3681 kfree(task->task_sg_bidi);
3682 kfree(task->task_sg);
3683
3684 list_del(&task->t_list);
3685
a1d8b49a 3686 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3687 if (task->se_dev)
e3d6f909 3688 task->se_dev->transport->free_task(task);
c66ac9db 3689 else
6708bb27 3690 pr_err("task[%u] - task->se_dev is NULL\n",
c66ac9db 3691 task->task_no);
a1d8b49a 3692 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3693 }
a1d8b49a 3694 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3695}
3696
6708bb27 3697static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3698{
ec98f782 3699 struct scatterlist *sg;
ec98f782 3700 int count;
c66ac9db 3701
6708bb27
AG		 3702 for_each_sg(sgl, sg, nents, count)
3703 __free_page(sg_page(sg));
c66ac9db 3704
6708bb27
AG		 3705 kfree(sgl);
3706}
c66ac9db 3707
6708bb27
AG		 3708static inline void transport_free_pages(struct se_cmd *cmd)
3709{
3710 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3711 return;
3712
3713 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3714 cmd->t_data_sg = NULL;
3715 cmd->t_data_nents = 0;
c66ac9db 3716
6708bb27 3717 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3718 cmd->t_bidi_data_sg = NULL;
3719 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3720}
3721
3722static inline void transport_release_tasks(struct se_cmd *cmd)
3723{
3724 transport_free_dev_tasks(cmd);
3725}
3726
3727static inline int transport_dec_and_check(struct se_cmd *cmd)
3728{
3729 unsigned long flags;
3730
a1d8b49a
AG		 3731 spin_lock_irqsave(&cmd->t_state_lock, flags);
3732 if (atomic_read(&cmd->t_fe_count)) {
6708bb27 3733 if (!atomic_dec_and_test(&cmd->t_fe_count)) {
a1d8b49a 3734 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3735 flags);
3736 return 1;
3737 }
3738 }
3739
a1d8b49a 3740 if (atomic_read(&cmd->t_se_count)) {
6708bb27 3741 if (!atomic_dec_and_test(&cmd->t_se_count)) {
a1d8b49a 3742 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3743 flags);
3744 return 1;
3745 }
3746 }
a1d8b49a 3747 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3748
3749 return 0;
3750}
3751
3752static void transport_release_fe_cmd(struct se_cmd *cmd)
3753{
3754 unsigned long flags;
3755
3756 if (transport_dec_and_check(cmd))
3757 return;
3758
a1d8b49a 3759 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3760 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3761 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3762 goto free_pages;
3763 }
a1d8b49a 3764 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3765 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3766 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3767
3768 transport_release_tasks(cmd);
3769free_pages:
3770 transport_free_pages(cmd);
3771 transport_free_se_cmd(cmd);
35462975 3772 cmd->se_tfo->release_cmd(cmd);
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
c66ac9db
NB		 3780 if (transport_dec_and_check(cmd)) {
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
a1d8b49a 3790 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3791 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3792 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3793 goto free_pages;
3794 }
a1d8b49a 3795 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3796 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3797 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3798
3799 transport_release_tasks(cmd);
5951146d 3800
c66ac9db
NB		 3801free_pages:
3802 transport_free_pages(cmd);
35462975 3803 transport_release_cmd(cmd);
c66ac9db
NB		 3804 return 0;
3805}
3806
3807/*
ec98f782
AG		 3808 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3809 * allocating in the core.
c66ac9db
NB		 3810 * @cmd: Associated se_cmd descriptor
3811 * @mem: SGL style memory for TCM WRITE / READ
3812 * @sg_mem_num: Number of SGL elements
3813 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3814 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3815 *
3816 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3817 * of parameters.
3818 */
3819int transport_generic_map_mem_to_cmd(
3820 struct se_cmd *cmd,
5951146d
AG		 3821 struct scatterlist *sgl,
3822 u32 sgl_count,
3823 struct scatterlist *sgl_bidi,
3824 u32 sgl_bidi_count)
c66ac9db 3825{
5951146d 3826 if (!sgl || !sgl_count)
c66ac9db 3827 return 0;
c66ac9db 3828
c66ac9db
NB		 3829 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3830 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3831
ec98f782
AG		 3832 cmd->t_data_sg = sgl;
3833 cmd->t_data_nents = sgl_count;
c66ac9db 3834
ec98f782
AG		 3835 if (sgl_bidi && sgl_bidi_count) {
3836 cmd->t_bidi_data_sg = sgl_bidi;
3837 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3838 }
3839 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3840 }
3841
3842 return 0;
3843}
3844EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3845
c66ac9db
NB		 3846static int transport_new_cmd_obj(struct se_cmd *cmd)
3847{
5951146d 3848 struct se_device *dev = cmd->se_dev;
a1d8b49a
AG		 3849 u32 task_cdbs;
3850 u32 rc;
ec98f782 3851 int set_counts = 1;
c66ac9db 3852
ec98f782
AG		 3853 /*
3854 * Setup any BIDI READ tasks and memory from
3855 * cmd->t_mem_bidi_list so the READ struct se_tasks
3856 * are queued first for the non pSCSI passthrough case.
3857 */
3858 if (cmd->t_bidi_data_sg &&
3859 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3860 rc = transport_allocate_tasks(cmd,
3861 cmd->t_task_lba,
3862 DMA_FROM_DEVICE,
3863 cmd->t_bidi_data_sg,
3864 cmd->t_bidi_data_nents);
6708bb27 3865 if (rc <= 0) {
c66ac9db
NB		 3866 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3867 cmd->scsi_sense_reason =
ec98f782 3868 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3869 return PYX_TRANSPORT_LU_COMM_FAILURE;
3870 }
ec98f782
AG		 3871 atomic_inc(&cmd->t_fe_count);
3872 atomic_inc(&cmd->t_se_count);
3873 set_counts = 0;
3874 }
3875 /*
3876 * Setup the tasks and memory from cmd->t_mem_list
3877 * Note for BIDI transfers this will contain the WRITE payload
3878 */
3879 task_cdbs = transport_allocate_tasks(cmd,
3880 cmd->t_task_lba,
3881 cmd->data_direction,
3882 cmd->t_data_sg,
3883 cmd->t_data_nents);
6708bb27 3884 if (task_cdbs <= 0) {
ec98f782
AG		 3885 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3886 cmd->scsi_sense_reason =
3887 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3888 return PYX_TRANSPORT_LU_COMM_FAILURE;
3889 }
c66ac9db 3890
ec98f782
AG		 3891 if (set_counts) {
3892 atomic_inc(&cmd->t_fe_count);
3893 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3894 }
3895
ec98f782
AG		 3896 cmd->t_task_list_num = task_cdbs;
3897
a1d8b49a
AG		 3898 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3899 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3900 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3901 return 0;
3902}
3903
05d1c7c0
AG		 3904void *transport_kmap_first_data_page(struct se_cmd *cmd)
3905{
ec98f782 3906 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3907
ec98f782 3908 BUG_ON(!sg);
05d1c7c0 3909 /*
ec98f782
AG		 3910 * We need to take into account a possible offset here for fabrics like
3911 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3912 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3913 */
ec98f782 3914 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3915}
3916EXPORT_SYMBOL(transport_kmap_first_data_page);
3917
3918void transport_kunmap_first_data_page(struct se_cmd *cmd)
3919{
ec98f782 3920 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3921}
3922EXPORT_SYMBOL(transport_kunmap_first_data_page);
3923
c66ac9db 3924static int
05d1c7c0 3925transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3926{
ec98f782
AG		 3927 u32 length = cmd->data_length;
3928 unsigned int nents;
3929 struct page *page;
3930 int i = 0;
c66ac9db 3931
ec98f782
AG		 3932 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3933 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3934 if (!cmd->t_data_sg)
3935 return -ENOMEM;
c66ac9db 3936
ec98f782
AG		 3937 cmd->t_data_nents = nents;
3938 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3939
ec98f782
AG		 3940 while (length) {
3941 u32 page_len = min_t(u32, length, PAGE_SIZE);
3942 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3943 if (!page)
3944 goto out;
c66ac9db 3945
ec98f782
AG		 3946 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3947 length -= page_len;
3948 i++;
c66ac9db 3949 }
c66ac9db 3950 return 0;
c66ac9db 3951
ec98f782
AG		 3952out:
3953 while (i >= 0) {
3954 __free_page(sg_page(&cmd->t_data_sg[i]));
3955 i--;
c66ac9db 3956 }
ec98f782
AG		 3957 kfree(cmd->t_data_sg);
3958 cmd->t_data_sg = NULL;
3959 return -ENOMEM;
c66ac9db
NB		 3960}
3961
a1d8b49a
AG		 3962/* Reduce sectors if they are too long for the device */
3963static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3964 struct se_device *dev,
3965 unsigned long long lba,
a1d8b49a 3966 sector_t sectors)
c66ac9db 3967{
a1d8b49a 3968 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3969
a1d8b49a
AG		 3970 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3971 if ((lba + sectors) > transport_dev_end_lba(dev))
3972 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3973
a1d8b49a 3974 return sectors;
c66ac9db
NB		 3975}
3976
c66ac9db
NB		 3977
3978/*
3979 * This function can be used by HW target mode drivers to create a linked
3980 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3981 * This is intended to be called during the completion path by TCM Core
3982 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3983 */
3984void transport_do_task_sg_chain(struct se_cmd *cmd)
3985{
ec98f782
AG		 3986 struct scatterlist *sg_first = NULL;
3987 struct scatterlist *sg_prev = NULL;
3988 int sg_prev_nents = 0;
3989 struct scatterlist *sg;
c66ac9db 3990 struct se_task *task;
ec98f782 3991 u32 chained_nents = 0;
c66ac9db
NB		 3992 int i;
3993
ec98f782
AG		 3994 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3995
c66ac9db
NB		 3996 /*
3997 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3998 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3999 */
a1d8b49a 4000 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 4001 if (!task->task_sg)
c66ac9db
NB		 4002 continue;
4003
ec98f782 4004 BUG_ON(!task->task_padded_sg);
c66ac9db 4005
ec98f782
AG		 4006 if (!sg_first) {
4007 sg_first = task->task_sg;
6708bb27 4008 chained_nents = task->task_sg_nents;
97868c89 4009 } else {
ec98f782 4010 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 4011 chained_nents += task->task_sg_nents;
97868c89 4012 }
ec98f782
AG		 4013
4014 sg_prev = task->task_sg;
6708bb27 4015 sg_prev_nents = task->task_sg_nents;
c66ac9db
NB		 4016 }
4017 /*
4018 * Setup the starting pointer and total t_tasks_sg_linked_no including
4019 * padding SGs for linking and to mark the end.
4020 */
a1d8b49a 4021 cmd->t_tasks_sg_chained = sg_first;
ec98f782 4022 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 4023
6708bb27 4024 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 4025 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4026 cmd->t_tasks_sg_chained_no);
c66ac9db 4027
a1d8b49a
AG		 4028 for_each_sg(cmd->t_tasks_sg_chained, sg,
4029 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 4030
6708bb27 4031 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 4032 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 4033 if (sg_is_chain(sg))
6708bb27 4034 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 4035 if (sg_is_last(sg))
6708bb27 4036 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 4037 }
c66ac9db
NB		 4038}
4039EXPORT_SYMBOL(transport_do_task_sg_chain);
4040
a1d8b49a
AG		 4041/*
4042 * Break up cmd into chunks transport can handle
4043 */
ec98f782 4044static int transport_allocate_data_tasks(
c66ac9db
NB		 4045 struct se_cmd *cmd,
4046 unsigned long long lba,
c66ac9db 4047 enum dma_data_direction data_direction,
ec98f782
AG		 4048 struct scatterlist *sgl,
4049 unsigned int sgl_nents)
c66ac9db
NB		 4050{
4051 unsigned char *cdb = NULL;
4052 struct se_task *task;
5951146d 4053 struct se_device *dev = cmd->se_dev;
ec98f782
AG		 4054 unsigned long flags;
4055 sector_t sectors;
1d20bb61 4056 int task_count, i, ret;
ec98f782
AG		 4057 sector_t dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
4058 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
4059 struct scatterlist *sg;
4060 struct scatterlist *cmd_sg;
a1d8b49a 4061
ec98f782
AG		 4062 WARN_ON(cmd->data_length % sector_size);
4063 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
4064 task_count = DIV_ROUND_UP(sectors, dev_max_sectors);
c66ac9db 4065
ec98f782
AG		 4066 cmd_sg = sgl;
4067 for (i = 0; i < task_count; i++) {
4068 unsigned int task_size;
4069 int count;
a1d8b49a 4070
c66ac9db 4071 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 4072 if (!task)
ec98f782 4073 return -ENOMEM;
c66ac9db 4074
c66ac9db 4075 task->task_lba = lba;
ec98f782
AG		 4076 task->task_sectors = min(sectors, dev_max_sectors);
4077 task->task_size = task->task_sectors * sector_size;
c66ac9db 4078
e3d6f909 4079 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4080 BUG_ON(!cdb);
4081
4082 memcpy(cdb, cmd->t_task_cdb,
4083 scsi_command_size(cmd->t_task_cdb));
4084
4085 /* Update new cdb with updated lba/sectors */
3a867205 4086 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
c66ac9db
NB		 4087
4088 /*
ec98f782
AG		 4089 * Check if the fabric module driver is requesting that all
4090 * struct se_task->task_sg[] be chained together.. If so,
4091 * then allocate an extra padding SG entry for linking and
4092 * marking the end of the chained SGL.
4093 * Possibly over-allocate task sgl size by using cmd sgl size.
4094 * It's so much easier and only a waste when task_count > 1.
4095 * That is extremely rare.
c66ac9db 4096 */
6708bb27 4097 task->task_sg_nents = sgl_nents;
ec98f782 4098 if (cmd->se_tfo->task_sg_chaining) {
6708bb27 4099 task->task_sg_nents++;
ec98f782
AG		 4100 task->task_padded_sg = 1;
4101 }
c66ac9db 4102
1d20bb61 4103 task->task_sg = kmalloc(sizeof(struct scatterlist) *
6708bb27 4104 task->task_sg_nents, GFP_KERNEL);
ec98f782
AG		 4105 if (!task->task_sg) {
4106 cmd->se_dev->transport->free_task(task);
4107 return -ENOMEM;
4108 }
4109
6708bb27 4110 sg_init_table(task->task_sg, task->task_sg_nents);
c66ac9db 4111
ec98f782
AG		 4112 task_size = task->task_size;
4113
4114 /* Build new sgl, only up to task_size */
6708bb27 4115 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 4116 if (cmd_sg->length > task_size)
4117 break;
4118
4119 *sg = *cmd_sg;
4120 task_size -= cmd_sg->length;
4121 cmd_sg = sg_next(cmd_sg);
c66ac9db 4122 }
c66ac9db 4123
ec98f782
AG		 4124 lba += task->task_sectors;
4125 sectors -= task->task_sectors;
c66ac9db 4126
ec98f782
AG		 4127 spin_lock_irqsave(&cmd->t_state_lock, flags);
4128 list_add_tail(&task->t_list, &cmd->t_task_list);
4129 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4130 }
1d20bb61
NB		 4131 /*
4132 * Now perform the memory map of task->task_sg[] into backend
4133 * subsystem memory..
4134 */
4135 list_for_each_entry(task, &cmd->t_task_list, t_list) {
4136 if (atomic_read(&task->task_sent))
4137 continue;
4138 if (!dev->transport->map_data_SG)
4139 continue;
4140
4141 ret = dev->transport->map_data_SG(task);
4142 if (ret < 0)
4143 return 0;
4144 }
c66ac9db 4145
ec98f782 4146 return task_count;
c66ac9db
NB		 4147}
4148
4149static int
ec98f782 4150transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 4151{
5951146d 4152 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4153 unsigned char *cdb;
4154 struct se_task *task;
ec98f782 4155 unsigned long flags;
6708bb27 4156 int ret = 0;
c66ac9db
NB		 4157
4158 task = transport_generic_get_task(cmd, cmd->data_direction);
4159 if (!task)
ec98f782 4160 return -ENOMEM;
c66ac9db 4161
e3d6f909 4162 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4163 BUG_ON(!cdb);
4164 memcpy(cdb, cmd->t_task_cdb,
4165 scsi_command_size(cmd->t_task_cdb));
c66ac9db 4166
ec98f782
AG		 4167 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4168 GFP_KERNEL);
4169 if (!task->task_sg) {
4170 cmd->se_dev->transport->free_task(task);
4171 return -ENOMEM;
4172 }
4173
4174 memcpy(task->task_sg, cmd->t_data_sg,
4175 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 4176 task->task_size = cmd->data_length;
6708bb27 4177 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 4178
ec98f782
AG		 4179 spin_lock_irqsave(&cmd->t_state_lock, flags);
4180 list_add_tail(&task->t_list, &cmd->t_task_list);
4181 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4182
4183 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
1d20bb61
NB		 4184 if (dev->transport->map_control_SG)
4185 ret = dev->transport->map_control_SG(task);
c66ac9db
NB		 4186 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4187 if (dev->transport->cdb_none)
6708bb27 4188 ret = dev->transport->cdb_none(task);
c66ac9db 4189 } else {
6708bb27 4190 pr_err("target: Unknown control cmd type!\n");
c66ac9db 4191 BUG();
ec98f782 4192 }
6708bb27
AG		 4193
4194 /* Success! Return number of tasks allocated */
4195 if (ret == 0)
4196 return 1;
4197 return ret;
ec98f782
AG		 4198}
4199
4200static u32 transport_allocate_tasks(
4201 struct se_cmd *cmd,
4202 unsigned long long lba,
4203 enum dma_data_direction data_direction,
4204 struct scatterlist *sgl,
4205 unsigned int sgl_nents)
4206{
6708bb27 4207 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)
ec98f782
AG		 4208 return transport_allocate_data_tasks(cmd, lba, data_direction,
4209 sgl, sgl_nents);
6708bb27
AG		 4210 else
4211 return transport_allocate_control_task(cmd);
4212
c66ac9db
NB		 4213}
4214
ec98f782 4215
c66ac9db
NB		 4216/* transport_generic_new_cmd(): Called from transport_processing_thread()
4217 *
4218 * Allocate storage transport resources from a set of values predefined
4219 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4220 * Any non zero return here is treated as an "out of resource' op here.
4221 */
4222 /*
4223 * Generate struct se_task(s) and/or their payloads for this CDB.
4224 */
a1d8b49a 4225int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4226{
c66ac9db
NB		 4227 int ret = 0;
4228
4229 /*
4230 * Determine is the TCM fabric module has already allocated physical
4231 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4232 * beforehand.
c66ac9db 4233 */
ec98f782
AG		 4234 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4235 cmd->data_length) {
05d1c7c0 4236 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4237 if (ret < 0)
4238 return ret;
4239 }
1d20bb61
NB		 4240 /*
4241 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4242 * control or data CDB types, and perform the map to backend subsystem
4243 * code from SGL memory allocated here by transport_generic_get_mem(), or
4244 * via pre-existing SGL memory setup explictly by fabric module code with
4245 * transport_generic_map_mem_to_cmd().
4246 */
c66ac9db
NB		 4247 ret = transport_new_cmd_obj(cmd);
4248 if (ret < 0)
4249 return ret;
c66ac9db 4250 /*
a1d8b49a 4251 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4252 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4253 * will be added to the struct se_device execution queue after its WRITE
4254 * data has arrived. (ie: It gets handled by the transport processing
4255 * thread a second time)
4256 */
4257 if (cmd->data_direction == DMA_TO_DEVICE) {
4258 transport_add_tasks_to_state_queue(cmd);
4259 return transport_generic_write_pending(cmd);
4260 }
4261 /*
4262 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4263 * to the execution queue.
4264 */
4265 transport_execute_tasks(cmd);
4266 return 0;
4267}
a1d8b49a 4268EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4269
4270/* transport_generic_process_write():
4271 *
4272 *
4273 */
4274void transport_generic_process_write(struct se_cmd *cmd)
4275{
c66ac9db
NB		 4276 transport_execute_tasks(cmd);
4277}
4278EXPORT_SYMBOL(transport_generic_process_write);
4279
07bde79a
NB		 4280static int transport_write_pending_qf(struct se_cmd *cmd)
4281{
4282 return cmd->se_tfo->write_pending(cmd);
4283}
4284
c66ac9db
NB		 4285/* transport_generic_write_pending():
4286 *
4287 *
4288 */
4289static int transport_generic_write_pending(struct se_cmd *cmd)
4290{
4291 unsigned long flags;
4292 int ret;
4293
a1d8b49a 4294 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4295 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4296 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a
NB		 4297
4298 if (cmd->transport_qf_callback) {
4299 ret = cmd->transport_qf_callback(cmd);
4300 if (ret == -EAGAIN)
4301 goto queue_full;
4302 else if (ret < 0)
4303 return ret;
4304
4305 cmd->transport_qf_callback = NULL;
4306 return 0;
4307 }
05d1c7c0 4308
c66ac9db
NB		 4309 /*
4310 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4311 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4312 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4313 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4314 * because the se_cmd->se_lun pointer is not being cleared.
4315 */
4316 transport_cmd_check_stop(cmd, 1, 0);
4317
4318 /*
4319 * Call the fabric write_pending function here to let the
4320 * frontend know that WRITE buffers are ready.
4321 */
e3d6f909 4322 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4323 if (ret == -EAGAIN)
4324 goto queue_full;
4325 else if (ret < 0)
c66ac9db
NB		 4326 return ret;
4327
4328 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4329
4330queue_full:
6708bb27 4331 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a
NB		 4332 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4333 transport_handle_queue_full(cmd, cmd->se_dev,
4334 transport_write_pending_qf);
4335 return ret;
c66ac9db
NB		 4336}
4337
35462975 4338void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4339{
e3d6f909 4340 BUG_ON(!cmd->se_tfo);
c66ac9db
NB		 4341
4342 transport_free_se_cmd(cmd);
35462975 4343 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4344}
35462975 4345EXPORT_SYMBOL(transport_release_cmd);
c66ac9db
NB		 4346
4347/* transport_generic_free_cmd():
4348 *
4349 * Called from processing frontend to release storage engine resources
4350 */
4351void transport_generic_free_cmd(
4352 struct se_cmd *cmd,
4353 int wait_for_tasks,
c66ac9db
NB		 4354 int session_reinstatement)
4355{
5951146d 4356 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
35462975 4357 transport_release_cmd(cmd);
c66ac9db
NB		 4358 else {
4359 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4360
e3d6f909 4361 if (cmd->se_lun) {
c66ac9db 4362#if 0
6708bb27 4363 pr_debug("cmd: %p ITT: 0x%08x contains"
e3d6f909
AG		 4364 " cmd->se_lun\n", cmd,
4365 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4366#endif
4367 transport_lun_remove_cmd(cmd);
4368 }
4369
4370 if (wait_for_tasks && cmd->transport_wait_for_tasks)
4371 cmd->transport_wait_for_tasks(cmd, 0, 0);
4372
f4366772
NB		 4373 transport_free_dev_tasks(cmd);
4374
35462975 4375 transport_generic_remove(cmd, session_reinstatement);
c66ac9db
NB		 4376 }
4377}
4378EXPORT_SYMBOL(transport_generic_free_cmd);
4379
4380static void transport_nop_wait_for_tasks(
4381 struct se_cmd *cmd,
4382 int remove_cmd,
4383 int session_reinstatement)
4384{
4385 return;
4386}
4387
4388/* transport_lun_wait_for_tasks():
4389 *
4390 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4391 * an struct se_lun to be successfully shutdown.
4392 */
4393static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4394{
4395 unsigned long flags;
4396 int ret;
4397 /*
4398 * If the frontend has already requested this struct se_cmd to
4399 * be stopped, we can safely ignore this struct se_cmd.
4400 */
a1d8b49a
AG		 4401 spin_lock_irqsave(&cmd->t_state_lock, flags);
4402 if (atomic_read(&cmd->t_transport_stop)) {
4403 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4404 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4405 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4406 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4407 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4408 return -EPERM;
c66ac9db 4409 }
a1d8b49a
AG		 4410 atomic_set(&cmd->transport_lun_fe_stop, 1);
4411 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4412
5951146d 4413 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4414
4415 ret = transport_stop_tasks_for_cmd(cmd);
4416
6708bb27
AG		 4417 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4418 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4419 if (!ret) {
6708bb27 4420 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4421 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4422 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4423 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4424 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4425 }
5951146d 4426 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4427
4428 return 0;
4429}
4430
c66ac9db
NB		 4431static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4432{
4433 struct se_cmd *cmd = NULL;
4434 unsigned long lun_flags, cmd_flags;
4435 /*
4436 * Do exception processing and return CHECK_CONDITION status to the
4437 * Initiator Port.
4438 */
4439 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4440 while (!list_empty(&lun->lun_cmd_list)) {
4441 cmd = list_first_entry(&lun->lun_cmd_list,
4442 struct se_cmd, se_lun_node);
4443 list_del(&cmd->se_lun_node);
4444
a1d8b49a 4445 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4446 /*
4447 * This will notify iscsi_target_transport.c:
4448 * transport_cmd_check_stop() that a LUN shutdown is in
4449 * progress for the iscsi_cmd_t.
4450 */
a1d8b49a 4451 spin_lock(&cmd->t_state_lock);
6708bb27 4452 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4453 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4454 cmd->se_lun->unpacked_lun,
4455 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4456 atomic_set(&cmd->transport_lun_stop, 1);
4457 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4458
4459 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4460
6708bb27
AG		 4461 if (!cmd->se_lun) {
4462 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4463 cmd->se_tfo->get_task_tag(cmd),
4464 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4465 BUG();
4466 }
4467 /*
4468 * If the Storage engine still owns the iscsi_cmd_t, determine
4469 * and/or stop its context.
4470 */
6708bb27 4471 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4472 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4473 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4474
e3d6f909 4475 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4476 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4477 continue;
4478 }
4479
6708bb27 4480 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4481 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4482 cmd->se_lun->unpacked_lun,
4483 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4484
a1d8b49a 4485 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4486 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4487 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4488 goto check_cond;
4489 }
a1d8b49a 4490 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4491 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4492 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4493
4494 transport_free_dev_tasks(cmd);
4495 /*
4496 * The Storage engine stopped this struct se_cmd before it was
4497 * send to the fabric frontend for delivery back to the
4498 * Initiator Node. Return this SCSI CDB back with an
4499 * CHECK_CONDITION status.
4500 */
4501check_cond:
4502 transport_send_check_condition_and_sense(cmd,
4503 TCM_NON_EXISTENT_LUN, 0);
4504 /*
4505 * If the fabric frontend is waiting for this iscsi_cmd_t to
4506 * be released, notify the waiting thread now that LU has
4507 * finished accessing it.
4508 */
a1d8b49a
AG		 4509 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4510 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4511 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4512 " struct se_cmd: %p ITT: 0x%08x\n",
4513 lun->unpacked_lun,
e3d6f909 4514 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4515
a1d8b49a 4516 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4517 cmd_flags);
4518 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4519 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4520 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4521 continue;
4522 }
6708bb27 4523 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4524 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4525
a1d8b49a 4526 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4527 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4528 }
4529 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4530}
4531
4532static int transport_clear_lun_thread(void *p)
4533{
4534 struct se_lun *lun = (struct se_lun *)p;
4535
4536 __transport_clear_lun_from_sessions(lun);
4537 complete(&lun->lun_shutdown_comp);
4538
4539 return 0;
4540}
4541
4542int transport_clear_lun_from_sessions(struct se_lun *lun)
4543{
4544 struct task_struct *kt;
4545
5951146d 4546 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4547 "tcm_cl_%u", lun->unpacked_lun);
4548 if (IS_ERR(kt)) {
6708bb27 4549 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4550 return PTR_ERR(kt);
c66ac9db
NB		 4551 }
4552 wait_for_completion(&lun->lun_shutdown_comp);
4553
4554 return 0;
4555}
4556
4557/* transport_generic_wait_for_tasks():
4558 *
4559 * Called from frontend or passthrough context to wait for storage engine
4560 * to pause and/or release frontend generated struct se_cmd.
4561 */
4562static void transport_generic_wait_for_tasks(
4563 struct se_cmd *cmd,
4564 int remove_cmd,
4565 int session_reinstatement)
4566{
4567 unsigned long flags;
4568
4569 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
4570 return;
4571
a1d8b49a 4572 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4573 /*
4574 * If we are already stopped due to an external event (ie: LUN shutdown)
4575 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4576 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4577 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4578 * has completed its operation on the struct se_cmd.
4579 */
a1d8b49a 4580 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4581
6708bb27 4582 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4583 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4584 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4585 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4586 /*
4587 * There is a special case for WRITES where a FE exception +
4588 * LUN shutdown means ConfigFS context is still sleeping on
4589 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4590 * We go ahead and up transport_lun_stop_comp just to be sure
4591 * here.
4592 */
a1d8b49a
AG		 4593 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4594 complete(&cmd->transport_lun_stop_comp);
4595 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4596 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4597
4598 transport_all_task_dev_remove_state(cmd);
4599 /*
4600 * At this point, the frontend who was the originator of this
4601 * struct se_cmd, now owns the structure and can be released through
4602 * normal means below.
4603 */
6708bb27 4604 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4605 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4606 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4607 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4608
a1d8b49a 4609 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4610 }
a1d8b49a
AG		 4611 if (!atomic_read(&cmd->t_transport_active) ||
4612 atomic_read(&cmd->t_transport_aborted))
c66ac9db
NB		 4613 goto remove;
4614
a1d8b49a 4615 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4616
6708bb27 4617 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4618 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4619 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4620 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4621 cmd->deferred_t_state);
4622
a1d8b49a 4623 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4624
5951146d 4625 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4626
a1d8b49a 4627 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4628
a1d8b49a
AG		 4629 spin_lock_irqsave(&cmd->t_state_lock, flags);
4630 atomic_set(&cmd->t_transport_active, 0);
4631 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4632
6708bb27 4633 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4634 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4635 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4636remove:
a1d8b49a 4637 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4638 if (!remove_cmd)
4639 return;
4640
35462975 4641 transport_generic_free_cmd(cmd, 0, session_reinstatement);
c66ac9db
NB		 4642}
4643
4644static int transport_get_sense_codes(
4645 struct se_cmd *cmd,
4646 u8 *asc,
4647 u8 *ascq)
4648{
4649 *asc = cmd->scsi_asc;
4650 *ascq = cmd->scsi_ascq;
4651
4652 return 0;
4653}
4654
4655static int transport_set_sense_codes(
4656 struct se_cmd *cmd,
4657 u8 asc,
4658 u8 ascq)
4659{
4660 cmd->scsi_asc = asc;
4661 cmd->scsi_ascq = ascq;
4662
4663 return 0;
4664}
4665
4666int transport_send_check_condition_and_sense(
4667 struct se_cmd *cmd,
4668 u8 reason,
4669 int from_transport)
4670{
4671 unsigned char *buffer = cmd->sense_buffer;
4672 unsigned long flags;
4673 int offset;
4674 u8 asc = 0, ascq = 0;
4675
a1d8b49a 4676 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4677 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4678 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4679 return 0;
4680 }
4681 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4682 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4683
4684 if (!reason && from_transport)
4685 goto after_reason;
4686
4687 if (!from_transport)
4688 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4689 /*
4690 * Data Segment and SenseLength of the fabric response PDU.
4691 *
4692 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4693 * from include/scsi/scsi_cmnd.h
4694 */
e3d6f909 4695 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4696 TRANSPORT_SENSE_BUFFER);
4697 /*
4698 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4699 * SENSE KEY values from include/scsi/scsi.h
4700 */
4701 switch (reason) {
4702 case TCM_NON_EXISTENT_LUN:
4703 case TCM_UNSUPPORTED_SCSI_OPCODE:
4704 case TCM_SECTOR_COUNT_TOO_MANY:
4705 /* CURRENT ERROR */
4706 buffer[offset] = 0x70;
4707 /* ILLEGAL REQUEST */
4708 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4709 /* INVALID COMMAND OPERATION CODE */
4710 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4711 break;
4712 case TCM_UNKNOWN_MODE_PAGE:
4713 /* CURRENT ERROR */
4714 buffer[offset] = 0x70;
4715 /* ILLEGAL REQUEST */
4716 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4717 /* INVALID FIELD IN CDB */
4718 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4719 break;
4720 case TCM_CHECK_CONDITION_ABORT_CMD:
4721 /* CURRENT ERROR */
4722 buffer[offset] = 0x70;
4723 /* ABORTED COMMAND */
4724 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4725 /* BUS DEVICE RESET FUNCTION OCCURRED */
4726 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4727 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4728 break;
4729 case TCM_INCORRECT_AMOUNT_OF_DATA:
4730 /* CURRENT ERROR */
4731 buffer[offset] = 0x70;
4732 /* ABORTED COMMAND */
4733 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4734 /* WRITE ERROR */
4735 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4736 /* NOT ENOUGH UNSOLICITED DATA */
4737 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4738 break;
4739 case TCM_INVALID_CDB_FIELD:
4740 /* CURRENT ERROR */
4741 buffer[offset] = 0x70;
4742 /* ABORTED COMMAND */
4743 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4744 /* INVALID FIELD IN CDB */
4745 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4746 break;
4747 case TCM_INVALID_PARAMETER_LIST:
4748 /* CURRENT ERROR */
4749 buffer[offset] = 0x70;
4750 /* ABORTED COMMAND */
4751 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4752 /* INVALID FIELD IN PARAMETER LIST */
4753 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4754 break;
4755 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4756 /* CURRENT ERROR */
4757 buffer[offset] = 0x70;
4758 /* ABORTED COMMAND */
4759 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4760 /* WRITE ERROR */
4761 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4762 /* UNEXPECTED_UNSOLICITED_DATA */
4763 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4764 break;
4765 case TCM_SERVICE_CRC_ERROR:
4766 /* CURRENT ERROR */
4767 buffer[offset] = 0x70;
4768 /* ABORTED COMMAND */
4769 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4770 /* PROTOCOL SERVICE CRC ERROR */
4771 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4772 /* N/A */
4773 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4774 break;
4775 case TCM_SNACK_REJECTED:
4776 /* CURRENT ERROR */
4777 buffer[offset] = 0x70;
4778 /* ABORTED COMMAND */
4779 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4780 /* READ ERROR */
4781 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4782 /* FAILED RETRANSMISSION REQUEST */
4783 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4784 break;
4785 case TCM_WRITE_PROTECTED:
4786 /* CURRENT ERROR */
4787 buffer[offset] = 0x70;
4788 /* DATA PROTECT */
4789 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4790 /* WRITE PROTECTED */
4791 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4792 break;
4793 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4794 /* CURRENT ERROR */
4795 buffer[offset] = 0x70;
4796 /* UNIT ATTENTION */
4797 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4798 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4799 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4800 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4801 break;
4802 case TCM_CHECK_CONDITION_NOT_READY:
4803 /* CURRENT ERROR */
4804 buffer[offset] = 0x70;
4805 /* Not Ready */
4806 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4807 transport_get_sense_codes(cmd, &asc, &ascq);
4808 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4809 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4810 break;
4811 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4812 default:
4813 /* CURRENT ERROR */
4814 buffer[offset] = 0x70;
4815 /* ILLEGAL REQUEST */
4816 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4817 /* LOGICAL UNIT COMMUNICATION FAILURE */
4818 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4819 break;
4820 }
4821 /*
4822 * This code uses linux/include/scsi/scsi.h SAM status codes!
4823 */
4824 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4825 /*
4826 * Automatically padded, this value is encoded in the fabric's
4827 * data_length response PDU containing the SCSI defined sense data.
4828 */
4829 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4830
4831after_reason:
07bde79a 4832 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4833}
4834EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4835
4836int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4837{
4838 int ret = 0;
4839
a1d8b49a 4840 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4841 if (!send_status ||
c66ac9db
NB		 4842 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4843 return 1;
4844#if 0
6708bb27 4845 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4846 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4847 cmd->t_task_cdb[0],
e3d6f909 4848 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4849#endif
4850 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4851 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4852 ret = 1;
4853 }
4854 return ret;
4855}
4856EXPORT_SYMBOL(transport_check_aborted_status);
4857
4858void transport_send_task_abort(struct se_cmd *cmd)
4859{
4860 /*
4861 * If there are still expected incoming fabric WRITEs, we wait
4862 * until until they have completed before sending a TASK_ABORTED
4863 * response. This response with TASK_ABORTED status will be
4864 * queued back to fabric module by transport_check_aborted_status().
4865 */
4866 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4867 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4868 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4869 smp_mb__after_atomic_inc();
4870 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4871 transport_new_cmd_failure(cmd);
4872 return;
4873 }
4874 }
4875 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4876#if 0
6708bb27 4877 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4878 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4879 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4880#endif
e3d6f909 4881 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4882}
4883
4884/* transport_generic_do_tmr():
4885 *
4886 *
4887 */
4888int transport_generic_do_tmr(struct se_cmd *cmd)
4889{
5951146d 4890 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4891 struct se_tmr_req *tmr = cmd->se_tmr_req;
4892 int ret;
4893
4894 switch (tmr->function) {
5c6cd613 4895 case TMR_ABORT_TASK:
c66ac9db
NB		 4896 tmr->response = TMR_FUNCTION_REJECTED;
4897 break;
5c6cd613
NB		 4898 case TMR_ABORT_TASK_SET:
4899 case TMR_CLEAR_ACA:
4900 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4901 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4902 break;
5c6cd613 4903 case TMR_LUN_RESET:
c66ac9db
NB		 4904 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4905 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4906 TMR_FUNCTION_REJECTED;
4907 break;
5c6cd613 4908 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4909 tmr->response = TMR_FUNCTION_REJECTED;
4910 break;
5c6cd613 4911 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4912 tmr->response = TMR_FUNCTION_REJECTED;
4913 break;
c66ac9db 4914 default:
6708bb27 4915 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4916 tmr->function);
4917 tmr->response = TMR_FUNCTION_REJECTED;
4918 break;
4919 }
4920
4921 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4922 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 4923
4924 transport_cmd_check_stop(cmd, 2, 0);
4925 return 0;
4926}
4927
4928/*
4929 * Called with spin_lock_irq(&dev->execute_task_lock); held
4930 *
4931 */
4932static struct se_task *
4933transport_get_task_from_state_list(struct se_device *dev)
4934{
4935 struct se_task *task;
4936
4937 if (list_empty(&dev->state_task_list))
4938 return NULL;
4939
4940 list_for_each_entry(task, &dev->state_task_list, t_state_list)
4941 break;
4942
4943 list_del(&task->t_state_list);
4944 atomic_set(&task->task_state_active, 0);
4945
4946 return task;
4947}
4948
4949static void transport_processing_shutdown(struct se_device *dev)
4950{
4951 struct se_cmd *cmd;
c66ac9db 4952 struct se_task *task;
c66ac9db
NB		 4953 unsigned long flags;
4954 /*
4955 * Empty the struct se_device's struct se_task state list.
4956 */
4957 spin_lock_irqsave(&dev->execute_task_lock, flags);
4958 while ((task = transport_get_task_from_state_list(dev))) {
e3d6f909 4959 if (!task->task_se_cmd) {
6708bb27 4960 pr_err("task->task_se_cmd is NULL!\n");
c66ac9db
NB		 4961 continue;
4962 }
e3d6f909 4963 cmd = task->task_se_cmd;
c66ac9db 4964
c66ac9db
NB		 4965 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
4966
a1d8b49a 4967 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4968
6708bb27
AG		 4969 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
4970 " i_state: %d, t_state/def_t_state:"
c66ac9db 4971 " %d/%d cdb: 0x%02x\n", cmd, task,
6708bb27
AG		 4972 cmd->se_tfo->get_task_tag(cmd),
4973 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db 4974 cmd->t_state, cmd->deferred_t_state,
a1d8b49a 4975 cmd->t_task_cdb[0]);
6708bb27 4976 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
c66ac9db
NB		 4977 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
4978 " t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909 4979 cmd->se_tfo->get_task_tag(cmd),
6708bb27 4980 cmd->t_task_list_num,
a1d8b49a
AG		 4981 atomic_read(&cmd->t_task_cdbs_left),
4982 atomic_read(&cmd->t_task_cdbs_sent),
4983 atomic_read(&cmd->t_transport_active),
4984 atomic_read(&cmd->t_transport_stop),
4985 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 4986
4987 if (atomic_read(&task->task_active)) {
4988 atomic_set(&task->task_stop, 1);
4989 spin_unlock_irqrestore(
a1d8b49a 4990 &cmd->t_state_lock, flags);
c66ac9db 4991
6708bb27 4992 pr_debug("Waiting for task: %p to shutdown for dev:"
c66ac9db
NB		 4993 " %p\n", task, dev);
4994 wait_for_completion(&task->task_stop_comp);
6708bb27 4995 pr_debug("Completed task: %p shutdown for dev: %p\n",
c66ac9db
NB		 4996 task, dev);
4997
a1d8b49a
AG		 4998 spin_lock_irqsave(&cmd->t_state_lock, flags);
4999 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 5000
5001 atomic_set(&task->task_active, 0);
5002 atomic_set(&task->task_stop, 0);
52208ae3
NB		 5003 } else {
5004 if (atomic_read(&task->task_execute_queue) != 0)
5005 transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 5006 }
5007 __transport_stop_task_timer(task, &flags);
5008
6708bb27 5009 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
c66ac9db 5010 spin_unlock_irqrestore(
a1d8b49a 5011 &cmd->t_state_lock, flags);
c66ac9db 5012
6708bb27 5013 pr_debug("Skipping task: %p, dev: %p for"
c66ac9db 5014 " t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a 5015 atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db
NB		 5016
5017 spin_lock_irqsave(&dev->execute_task_lock, flags);
5018 continue;
5019 }
5020
a1d8b49a 5021 if (atomic_read(&cmd->t_transport_active)) {
6708bb27 5022 pr_debug("got t_transport_active = 1 for task: %p, dev:"
c66ac9db
NB		 5023 " %p\n", task, dev);
5024
a1d8b49a 5025 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5026 spin_unlock_irqrestore(
a1d8b49a 5027 &cmd->t_state_lock, flags);
c66ac9db
NB		 5028 transport_send_check_condition_and_sense(
5029 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5030 0);
5031 transport_remove_cmd_from_queue(cmd,
5951146d 5032 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5033
5034 transport_lun_remove_cmd(cmd);
5035 transport_cmd_check_stop(cmd, 1, 0);
5036 } else {
5037 spin_unlock_irqrestore(
a1d8b49a 5038 &cmd->t_state_lock, flags);
c66ac9db
NB		 5039
5040 transport_remove_cmd_from_queue(cmd,
5951146d 5041 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5042
5043 transport_lun_remove_cmd(cmd);
5044
5045 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5046 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5047 }
5048
5049 spin_lock_irqsave(&dev->execute_task_lock, flags);
5050 continue;
5051 }
6708bb27 5052 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
c66ac9db
NB		 5053 task, dev);
5054
a1d8b49a 5055 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5056 spin_unlock_irqrestore(
a1d8b49a 5057 &cmd->t_state_lock, flags);
c66ac9db
NB		 5058 transport_send_check_condition_and_sense(cmd,
5059 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5060 transport_remove_cmd_from_queue(cmd,
5951146d 5061 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5062
5063 transport_lun_remove_cmd(cmd);
5064 transport_cmd_check_stop(cmd, 1, 0);
5065 } else {
5066 spin_unlock_irqrestore(
a1d8b49a 5067 &cmd->t_state_lock, flags);
c66ac9db
NB		 5068
5069 transport_remove_cmd_from_queue(cmd,
5951146d 5070 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5071 transport_lun_remove_cmd(cmd);
5072
5073 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5074 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5075 }
5076
5077 spin_lock_irqsave(&dev->execute_task_lock, flags);
5078 }
5079 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5080 /*
5081 * Empty the struct se_device's struct se_cmd list.
5082 */
5951146d 5083 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
c66ac9db 5084
6708bb27 5085 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5951146d 5086 cmd, cmd->t_state);
c66ac9db 5087
a1d8b49a 5088 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db
NB		 5089 transport_send_check_condition_and_sense(cmd,
5090 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5091
5092 transport_lun_remove_cmd(cmd);
5093 transport_cmd_check_stop(cmd, 1, 0);
5094 } else {
5095 transport_lun_remove_cmd(cmd);
5096 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5097 transport_generic_remove(cmd, 0);
c66ac9db 5098 }
c66ac9db 5099 }
c66ac9db
NB		 5100}
5101
5102/* transport_processing_thread():
5103 *
5104 *
5105 */
5106static int transport_processing_thread(void *param)
5107{
5951146d 5108 int ret;
c66ac9db
NB		 5109 struct se_cmd *cmd;
5110 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 5111
5112 set_user_nice(current, -20);
5113
5114 while (!kthread_should_stop()) {
e3d6f909
AG		 5115 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5116 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 5117 kthread_should_stop());
5118 if (ret < 0)
5119 goto out;
5120
5121 spin_lock_irq(&dev->dev_status_lock);
5122 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5123 spin_unlock_irq(&dev->dev_status_lock);
5124 transport_processing_shutdown(dev);
5125 continue;
5126 }
5127 spin_unlock_irq(&dev->dev_status_lock);
5128
5129get_cmd:
5130 __transport_execute_tasks(dev);
5131
5951146d
AG		 5132 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5133 if (!cmd)
c66ac9db
NB		 5134 continue;
5135
5951146d 5136 switch (cmd->t_state) {
c66ac9db 5137 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 5138 if (!cmd->se_tfo->new_cmd_map) {
5139 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 5140 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5141 BUG();
5142 }
e3d6f909 5143 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 5144 if (ret < 0) {
5145 cmd->transport_error_status = ret;
5146 transport_generic_request_failure(cmd, NULL,
5147 0, (cmd->data_direction !=
5148 DMA_TO_DEVICE));
5149 break;
5150 }
5151 /* Fall through */
5152 case TRANSPORT_NEW_CMD:
5153 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 5154 if (ret == -EAGAIN)
5155 break;
5156 else if (ret < 0) {
c66ac9db
NB		 5157 cmd->transport_error_status = ret;
5158 transport_generic_request_failure(cmd, NULL,
5159 0, (cmd->data_direction !=
5160 DMA_TO_DEVICE));
5161 }
5162 break;
5163 case TRANSPORT_PROCESS_WRITE:
5164 transport_generic_process_write(cmd);
5165 break;
5166 case TRANSPORT_COMPLETE_OK:
5167 transport_stop_all_task_timers(cmd);
5168 transport_generic_complete_ok(cmd);
5169 break;
5170 case TRANSPORT_REMOVE:
35462975 5171 transport_generic_remove(cmd, 0);
c66ac9db 5172 break;
f4366772 5173 case TRANSPORT_FREE_CMD_INTR:
35462975 5174 transport_generic_free_cmd(cmd, 0, 0);
f4366772 5175 break;
c66ac9db
NB		 5176 case TRANSPORT_PROCESS_TMR:
5177 transport_generic_do_tmr(cmd);
5178 break;
5179 case TRANSPORT_COMPLETE_FAILURE:
5180 transport_generic_request_failure(cmd, NULL, 1, 1);
5181 break;
5182 case TRANSPORT_COMPLETE_TIMEOUT:
5183 transport_stop_all_task_timers(cmd);
5184 transport_generic_request_timeout(cmd);
5185 break;
07bde79a
NB		 5186 case TRANSPORT_COMPLETE_QF_WP:
5187 transport_generic_write_pending(cmd);
5188 break;
c66ac9db 5189 default:
6708bb27 5190 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 5191 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 5192 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 5193 cmd->se_tfo->get_task_tag(cmd),
5194 cmd->se_tfo->get_cmd_state(cmd),
5195 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 5196 BUG();
5197 }
5198
5199 goto get_cmd;
5200 }
5201
5202out:
5203 transport_release_all_cmds(dev);
5204 dev->process_thread = NULL;
5205 return 0;
5206}
kernel source for telekom puls (alcatel/mediatek)