]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/target/target_core_transport.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
target: Add transport_handle_cdb_direct optimization
[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
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
61/* #define DEBUG_CDB_HANDLER */
62#ifdef DEBUG_CDB_HANDLER
63#define DEBUG_CDB_H(x...) printk(KERN_INFO x)
64#else
65#define DEBUG_CDB_H(x...)
66#endif
67
68/* #define DEBUG_CMD_MAP */
69#ifdef DEBUG_CMD_MAP
70#define DEBUG_CMD_M(x...) printk(KERN_INFO x)
71#else
72#define DEBUG_CMD_M(x...)
73#endif
74
75/* #define DEBUG_MEM_ALLOC */
76#ifdef DEBUG_MEM_ALLOC
77#define DEBUG_MEM(x...) printk(KERN_INFO x)
78#else
79#define DEBUG_MEM(x...)
80#endif
81
82/* #define DEBUG_MEM2_ALLOC */
83#ifdef DEBUG_MEM2_ALLOC
84#define DEBUG_MEM2(x...) printk(KERN_INFO x)
85#else
86#define DEBUG_MEM2(x...)
87#endif
88
89/* #define DEBUG_SG_CALC */
90#ifdef DEBUG_SG_CALC
91#define DEBUG_SC(x...) printk(KERN_INFO x)
92#else
93#define DEBUG_SC(x...)
94#endif
95
96/* #define DEBUG_SE_OBJ */
97#ifdef DEBUG_SE_OBJ
98#define DEBUG_SO(x...) printk(KERN_INFO x)
99#else
100#define DEBUG_SO(x...)
101#endif
102
103/* #define DEBUG_CMD_VOL */
104#ifdef DEBUG_CMD_VOL
105#define DEBUG_VOL(x...) printk(KERN_INFO x)
106#else
107#define DEBUG_VOL(x...)
108#endif
109
110/* #define DEBUG_CMD_STOP */
111#ifdef DEBUG_CMD_STOP
112#define DEBUG_CS(x...) printk(KERN_INFO x)
113#else
114#define DEBUG_CS(x...)
115#endif
116
117/* #define DEBUG_PASSTHROUGH */
118#ifdef DEBUG_PASSTHROUGH
119#define DEBUG_PT(x...) printk(KERN_INFO x)
120#else
121#define DEBUG_PT(x...)
122#endif
123
124/* #define DEBUG_TASK_STOP */
125#ifdef DEBUG_TASK_STOP
126#define DEBUG_TS(x...) printk(KERN_INFO x)
127#else
128#define DEBUG_TS(x...)
129#endif
130
131/* #define DEBUG_TRANSPORT_STOP */
132#ifdef DEBUG_TRANSPORT_STOP
133#define DEBUG_TRANSPORT_S(x...) printk(KERN_INFO x)
134#else
135#define DEBUG_TRANSPORT_S(x...)
136#endif
137
138/* #define DEBUG_TASK_FAILURE */
139#ifdef DEBUG_TASK_FAILURE
140#define DEBUG_TF(x...) printk(KERN_INFO x)
141#else
142#define DEBUG_TF(x...)
143#endif
144
145/* #define DEBUG_DEV_OFFLINE */
146#ifdef DEBUG_DEV_OFFLINE
147#define DEBUG_DO(x...) printk(KERN_INFO x)
148#else
149#define DEBUG_DO(x...)
150#endif
151
152/* #define DEBUG_TASK_STATE */
153#ifdef DEBUG_TASK_STATE
154#define DEBUG_TSTATE(x...) printk(KERN_INFO x)
155#else
156#define DEBUG_TSTATE(x...)
157#endif
158
159/* #define DEBUG_STATUS_THR */
160#ifdef DEBUG_STATUS_THR
161#define DEBUG_ST(x...) printk(KERN_INFO x)
162#else
163#define DEBUG_ST(x...)
164#endif
165
166/* #define DEBUG_TASK_TIMEOUT */
167#ifdef DEBUG_TASK_TIMEOUT
168#define DEBUG_TT(x...) printk(KERN_INFO x)
169#else
170#define DEBUG_TT(x...)
171#endif
172
173/* #define DEBUG_GENERIC_REQUEST_FAILURE */
174#ifdef DEBUG_GENERIC_REQUEST_FAILURE
175#define DEBUG_GRF(x...) printk(KERN_INFO x)
176#else
177#define DEBUG_GRF(x...)
178#endif
179
180/* #define DEBUG_SAM_TASK_ATTRS */
181#ifdef DEBUG_SAM_TASK_ATTRS
182#define DEBUG_STA(x...) printk(KERN_INFO x)
183#else
184#define DEBUG_STA(x...)
185#endif
186
e3d6f909 187static int sub_api_initialized;
c66ac9db
NB		 188
189static struct kmem_cache *se_cmd_cache;
190static struct kmem_cache *se_sess_cache;
191struct kmem_cache *se_tmr_req_cache;
192struct kmem_cache *se_ua_cache;
193struct kmem_cache *se_mem_cache;
194struct kmem_cache *t10_pr_reg_cache;
195struct kmem_cache *t10_alua_lu_gp_cache;
196struct kmem_cache *t10_alua_lu_gp_mem_cache;
197struct kmem_cache *t10_alua_tg_pt_gp_cache;
198struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
199
200/* Used for transport_dev_get_map_*() */
201typedef int (*map_func_t)(struct se_task *, u32);
202
203static int transport_generic_write_pending(struct se_cmd *);
5951146d 204static int transport_processing_thread(void *param);
c66ac9db
NB		 205static int __transport_execute_tasks(struct se_device *dev);
206static void transport_complete_task_attr(struct se_cmd *cmd);
207static void transport_direct_request_timeout(struct se_cmd *cmd);
208static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 209static u32 transport_allocate_tasks(struct se_cmd *cmd,
c66ac9db
NB		 210 unsigned long long starting_lba, u32 sectors,
211 enum dma_data_direction data_direction,
212 struct list_head *mem_list, int set_counts);
a1d8b49a 213static int transport_generic_get_mem(struct se_cmd *cmd, u32 length);
c66ac9db 214static int transport_generic_remove(struct se_cmd *cmd,
35462975 215 int session_reinstatement);
a1d8b49a 216static int transport_cmd_get_valid_sectors(struct se_cmd *cmd);
c66ac9db 217static int transport_map_sg_to_mem(struct se_cmd *cmd,
a1d8b49a
AG		 218 struct list_head *se_mem_list, struct scatterlist *sgl);
219static void transport_memcpy_se_mem_read_contig(unsigned char *dst,
220 struct list_head *se_mem_list, u32 len);
c66ac9db
NB		 221static void transport_release_fe_cmd(struct se_cmd *cmd);
222static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
223 struct se_queue_obj *qobj);
224static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
225static void transport_stop_all_task_timers(struct se_cmd *cmd);
226
e3d6f909 227int init_se_kmem_caches(void)
c66ac9db 228{
c66ac9db
NB		 229 se_cmd_cache = kmem_cache_create("se_cmd_cache",
230 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
231 if (!(se_cmd_cache)) {
232 printk(KERN_ERR "kmem_cache_create for struct se_cmd failed\n");
233 goto out;
234 }
235 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
236 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
237 0, NULL);
238 if (!(se_tmr_req_cache)) {
239 printk(KERN_ERR "kmem_cache_create() for struct se_tmr_req"
240 " failed\n");
241 goto out;
242 }
243 se_sess_cache = kmem_cache_create("se_sess_cache",
244 sizeof(struct se_session), __alignof__(struct se_session),
245 0, NULL);
246 if (!(se_sess_cache)) {
247 printk(KERN_ERR "kmem_cache_create() for struct se_session"
248 " failed\n");
249 goto out;
250 }
251 se_ua_cache = kmem_cache_create("se_ua_cache",
252 sizeof(struct se_ua), __alignof__(struct se_ua),
253 0, NULL);
254 if (!(se_ua_cache)) {
255 printk(KERN_ERR "kmem_cache_create() for struct se_ua failed\n");
256 goto out;
257 }
258 se_mem_cache = kmem_cache_create("se_mem_cache",
259 sizeof(struct se_mem), __alignof__(struct se_mem), 0, NULL);
260 if (!(se_mem_cache)) {
261 printk(KERN_ERR "kmem_cache_create() for struct se_mem failed\n");
262 goto out;
263 }
264 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
265 sizeof(struct t10_pr_registration),
266 __alignof__(struct t10_pr_registration), 0, NULL);
267 if (!(t10_pr_reg_cache)) {
268 printk(KERN_ERR "kmem_cache_create() for struct t10_pr_registration"
269 " failed\n");
270 goto out;
271 }
272 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
273 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
274 0, NULL);
275 if (!(t10_alua_lu_gp_cache)) {
276 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_cache"
277 " failed\n");
278 goto out;
279 }
280 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
281 sizeof(struct t10_alua_lu_gp_member),
282 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
283 if (!(t10_alua_lu_gp_mem_cache)) {
284 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_mem_"
285 "cache failed\n");
286 goto out;
287 }
288 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
289 sizeof(struct t10_alua_tg_pt_gp),
290 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
291 if (!(t10_alua_tg_pt_gp_cache)) {
292 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
293 "cache failed\n");
294 goto out;
295 }
296 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
297 "t10_alua_tg_pt_gp_mem_cache",
298 sizeof(struct t10_alua_tg_pt_gp_member),
299 __alignof__(struct t10_alua_tg_pt_gp_member),
300 0, NULL);
301 if (!(t10_alua_tg_pt_gp_mem_cache)) {
302 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
303 "mem_t failed\n");
304 goto out;
305 }
306
c66ac9db
NB		 307 return 0;
308out:
309 if (se_cmd_cache)
310 kmem_cache_destroy(se_cmd_cache);
311 if (se_tmr_req_cache)
312 kmem_cache_destroy(se_tmr_req_cache);
313 if (se_sess_cache)
314 kmem_cache_destroy(se_sess_cache);
315 if (se_ua_cache)
316 kmem_cache_destroy(se_ua_cache);
317 if (se_mem_cache)
318 kmem_cache_destroy(se_mem_cache);
319 if (t10_pr_reg_cache)
320 kmem_cache_destroy(t10_pr_reg_cache);
321 if (t10_alua_lu_gp_cache)
322 kmem_cache_destroy(t10_alua_lu_gp_cache);
323 if (t10_alua_lu_gp_mem_cache)
324 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
325 if (t10_alua_tg_pt_gp_cache)
326 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
327 if (t10_alua_tg_pt_gp_mem_cache)
328 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 329 return -ENOMEM;
c66ac9db
NB		 330}
331
e3d6f909 332void release_se_kmem_caches(void)
c66ac9db 333{
c66ac9db
NB		 334 kmem_cache_destroy(se_cmd_cache);
335 kmem_cache_destroy(se_tmr_req_cache);
336 kmem_cache_destroy(se_sess_cache);
337 kmem_cache_destroy(se_ua_cache);
338 kmem_cache_destroy(se_mem_cache);
339 kmem_cache_destroy(t10_pr_reg_cache);
340 kmem_cache_destroy(t10_alua_lu_gp_cache);
341 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
342 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
343 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 344}
345
e3d6f909
AG		 346/* This code ensures unique mib indexes are handed out. */
347static DEFINE_SPINLOCK(scsi_mib_index_lock);
348static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 349
350/*
351 * Allocate a new row index for the entry type specified
352 */
353u32 scsi_get_new_index(scsi_index_t type)
354{
355 u32 new_index;
356
e3d6f909 357 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 358
e3d6f909
AG		 359 spin_lock(&scsi_mib_index_lock);
360 new_index = ++scsi_mib_index[type];
361 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 362
363 return new_index;
364}
365
c66ac9db
NB		 366void transport_init_queue_obj(struct se_queue_obj *qobj)
367{
368 atomic_set(&qobj->queue_cnt, 0);
369 INIT_LIST_HEAD(&qobj->qobj_list);
370 init_waitqueue_head(&qobj->thread_wq);
371 spin_lock_init(&qobj->cmd_queue_lock);
372}
373EXPORT_SYMBOL(transport_init_queue_obj);
374
375static int transport_subsystem_reqmods(void)
376{
377 int ret;
378
379 ret = request_module("target_core_iblock");
380 if (ret != 0)
381 printk(KERN_ERR "Unable to load target_core_iblock\n");
382
383 ret = request_module("target_core_file");
384 if (ret != 0)
385 printk(KERN_ERR "Unable to load target_core_file\n");
386
387 ret = request_module("target_core_pscsi");
388 if (ret != 0)
389 printk(KERN_ERR "Unable to load target_core_pscsi\n");
390
391 ret = request_module("target_core_stgt");
392 if (ret != 0)
393 printk(KERN_ERR "Unable to load target_core_stgt\n");
394
395 return 0;
396}
397
398int transport_subsystem_check_init(void)
399{
e3d6f909
AG		 400 int ret;
401
402 if (sub_api_initialized)
c66ac9db
NB		 403 return 0;
404 /*
405 * Request the loading of known TCM subsystem plugins..
406 */
e3d6f909
AG		 407 ret = transport_subsystem_reqmods();
408 if (ret < 0)
409 return ret;
c66ac9db 410
e3d6f909 411 sub_api_initialized = 1;
c66ac9db
NB		 412 return 0;
413}
414
415struct se_session *transport_init_session(void)
416{
417 struct se_session *se_sess;
418
419 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
420 if (!(se_sess)) {
421 printk(KERN_ERR "Unable to allocate struct se_session from"
422 " se_sess_cache\n");
423 return ERR_PTR(-ENOMEM);
424 }
425 INIT_LIST_HEAD(&se_sess->sess_list);
426 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 427
428 return se_sess;
429}
430EXPORT_SYMBOL(transport_init_session);
431
432/*
433 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
434 */
435void __transport_register_session(
436 struct se_portal_group *se_tpg,
437 struct se_node_acl *se_nacl,
438 struct se_session *se_sess,
439 void *fabric_sess_ptr)
440{
441 unsigned char buf[PR_REG_ISID_LEN];
442
443 se_sess->se_tpg = se_tpg;
444 se_sess->fabric_sess_ptr = fabric_sess_ptr;
445 /*
446 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
447 *
448 * Only set for struct se_session's that will actually be moving I/O.
449 * eg: *NOT* discovery sessions.
450 */
451 if (se_nacl) {
452 /*
453 * If the fabric module supports an ISID based TransportID,
454 * save this value in binary from the fabric I_T Nexus now.
455 */
e3d6f909 456 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 457 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 458 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 459 &buf[0], PR_REG_ISID_LEN);
460 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
461 }
462 spin_lock_irq(&se_nacl->nacl_sess_lock);
463 /*
464 * The se_nacl->nacl_sess pointer will be set to the
465 * last active I_T Nexus for each struct se_node_acl.
466 */
467 se_nacl->nacl_sess = se_sess;
468
469 list_add_tail(&se_sess->sess_acl_list,
470 &se_nacl->acl_sess_list);
471 spin_unlock_irq(&se_nacl->nacl_sess_lock);
472 }
473 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
474
475 printk(KERN_INFO "TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 476 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 477}
478EXPORT_SYMBOL(__transport_register_session);
479
480void transport_register_session(
481 struct se_portal_group *se_tpg,
482 struct se_node_acl *se_nacl,
483 struct se_session *se_sess,
484 void *fabric_sess_ptr)
485{
486 spin_lock_bh(&se_tpg->session_lock);
487 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
488 spin_unlock_bh(&se_tpg->session_lock);
489}
490EXPORT_SYMBOL(transport_register_session);
491
492void transport_deregister_session_configfs(struct se_session *se_sess)
493{
494 struct se_node_acl *se_nacl;
23388864 495 unsigned long flags;
c66ac9db
NB		 496 /*
497 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
498 */
499 se_nacl = se_sess->se_node_acl;
500 if ((se_nacl)) {
23388864 501 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 502 list_del(&se_sess->sess_acl_list);
503 /*
504 * If the session list is empty, then clear the pointer.
505 * Otherwise, set the struct se_session pointer from the tail
506 * element of the per struct se_node_acl active session list.
507 */
508 if (list_empty(&se_nacl->acl_sess_list))
509 se_nacl->nacl_sess = NULL;
510 else {
511 se_nacl->nacl_sess = container_of(
512 se_nacl->acl_sess_list.prev,
513 struct se_session, sess_acl_list);
514 }
23388864 515 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 516 }
517}
518EXPORT_SYMBOL(transport_deregister_session_configfs);
519
520void transport_free_session(struct se_session *se_sess)
521{
522 kmem_cache_free(se_sess_cache, se_sess);
523}
524EXPORT_SYMBOL(transport_free_session);
525
526void transport_deregister_session(struct se_session *se_sess)
527{
528 struct se_portal_group *se_tpg = se_sess->se_tpg;
529 struct se_node_acl *se_nacl;
530
531 if (!(se_tpg)) {
532 transport_free_session(se_sess);
533 return;
534 }
c66ac9db
NB		 535
536 spin_lock_bh(&se_tpg->session_lock);
537 list_del(&se_sess->sess_list);
538 se_sess->se_tpg = NULL;
539 se_sess->fabric_sess_ptr = NULL;
540 spin_unlock_bh(&se_tpg->session_lock);
541
542 /*
543 * Determine if we need to do extra work for this initiator node's
544 * struct se_node_acl if it had been previously dynamically generated.
545 */
546 se_nacl = se_sess->se_node_acl;
547 if ((se_nacl)) {
548 spin_lock_bh(&se_tpg->acl_node_lock);
549 if (se_nacl->dynamic_node_acl) {
e3d6f909 550 if (!(se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
c66ac9db
NB		 551 se_tpg))) {
552 list_del(&se_nacl->acl_list);
553 se_tpg->num_node_acls--;
554 spin_unlock_bh(&se_tpg->acl_node_lock);
555
556 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 557 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 558 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db
NB		 559 se_nacl);
560 spin_lock_bh(&se_tpg->acl_node_lock);
561 }
562 }
563 spin_unlock_bh(&se_tpg->acl_node_lock);
564 }
565
566 transport_free_session(se_sess);
567
568 printk(KERN_INFO "TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 569 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 570}
571EXPORT_SYMBOL(transport_deregister_session);
572
573/*
a1d8b49a 574 * Called with cmd->t_state_lock held.
c66ac9db
NB		 575 */
576static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
577{
578 struct se_device *dev;
579 struct se_task *task;
580 unsigned long flags;
581
a1d8b49a 582 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 583 dev = task->se_dev;
584 if (!(dev))
585 continue;
586
587 if (atomic_read(&task->task_active))
588 continue;
589
590 if (!(atomic_read(&task->task_state_active)))
591 continue;
592
593 spin_lock_irqsave(&dev->execute_task_lock, flags);
594 list_del(&task->t_state_list);
595 DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n",
e3d6f909 596 cmd->se_tfo->tfo_get_task_tag(cmd), dev, task);
c66ac9db
NB		 597 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
598
599 atomic_set(&task->task_state_active, 0);
a1d8b49a 600 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 601 }
602}
603
604/* transport_cmd_check_stop():
605 *
606 * 'transport_off = 1' determines if t_transport_active should be cleared.
607 * 'transport_off = 2' determines if task_dev_state should be removed.
608 *
609 * A non-zero u8 t_state sets cmd->t_state.
610 * Returns 1 when command is stopped, else 0.
611 */
612static int transport_cmd_check_stop(
613 struct se_cmd *cmd,
614 int transport_off,
615 u8 t_state)
616{
617 unsigned long flags;
618
a1d8b49a 619 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 620 /*
621 * Determine if IOCTL context caller in requesting the stopping of this
622 * command for LUN shutdown purposes.
623 */
a1d8b49a
AG		 624 if (atomic_read(&cmd->transport_lun_stop)) {
625 DEBUG_CS("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 626 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 627 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 628
629 cmd->deferred_t_state = cmd->t_state;
630 cmd->t_state = TRANSPORT_DEFERRED_CMD;
a1d8b49a 631 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 632 if (transport_off == 2)
633 transport_all_task_dev_remove_state(cmd);
a1d8b49a 634 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 635
a1d8b49a 636 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 637 return 1;
638 }
639 /*
640 * Determine if frontend context caller is requesting the stopping of
e3d6f909 641 * this command for frontend exceptions.
c66ac9db 642 */
a1d8b49a
AG		 643 if (atomic_read(&cmd->t_transport_stop)) {
644 DEBUG_CS("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 645 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 646 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 647
648 cmd->deferred_t_state = cmd->t_state;
649 cmd->t_state = TRANSPORT_DEFERRED_CMD;
650 if (transport_off == 2)
651 transport_all_task_dev_remove_state(cmd);
652
653 /*
654 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
655 * to FE.
656 */
657 if (transport_off == 2)
658 cmd->se_lun = NULL;
a1d8b49a 659 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 660
a1d8b49a 661 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 662 return 1;
663 }
664 if (transport_off) {
a1d8b49a 665 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 666 if (transport_off == 2) {
667 transport_all_task_dev_remove_state(cmd);
668 /*
669 * Clear struct se_cmd->se_lun before the transport_off == 2
670 * handoff to fabric module.
671 */
672 cmd->se_lun = NULL;
673 /*
674 * Some fabric modules like tcm_loop can release
25985edc 675 * their internally allocated I/O reference now and
c66ac9db
NB		 676 * struct se_cmd now.
677 */
e3d6f909 678 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 679 spin_unlock_irqrestore(
a1d8b49a 680 &cmd->t_state_lock, flags);
c66ac9db 681
e3d6f909 682 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 683 return 1;
684 }
685 }
a1d8b49a 686 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 687
688 return 0;
689 } else if (t_state)
690 cmd->t_state = t_state;
a1d8b49a 691 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 692
693 return 0;
694}
695
696static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
697{
698 return transport_cmd_check_stop(cmd, 2, 0);
699}
700
701static void transport_lun_remove_cmd(struct se_cmd *cmd)
702{
e3d6f909 703 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 704 unsigned long flags;
705
706 if (!lun)
707 return;
708
a1d8b49a
AG		 709 spin_lock_irqsave(&cmd->t_state_lock, flags);
710 if (!(atomic_read(&cmd->transport_dev_active))) {
711 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 712 goto check_lun;
713 }
a1d8b49a 714 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 715 transport_all_task_dev_remove_state(cmd);
a1d8b49a 716 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 717
c66ac9db
NB		 718
719check_lun:
720 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 721 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 722 list_del(&cmd->se_lun_node);
a1d8b49a 723 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 724#if 0
725 printk(KERN_INFO "Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 726 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 727#endif
728 }
729 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
730}
731
732void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
733{
5951146d 734 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 735 transport_lun_remove_cmd(cmd);
736
737 if (transport_cmd_check_stop_to_fabric(cmd))
738 return;
739 if (remove)
35462975 740 transport_generic_remove(cmd, 0);
c66ac9db
NB		 741}
742
743void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
744{
5951146d 745 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 746
747 if (transport_cmd_check_stop_to_fabric(cmd))
748 return;
749
35462975 750 transport_generic_remove(cmd, 0);
c66ac9db
NB		 751}
752
5951146d 753static void transport_add_cmd_to_queue(
c66ac9db
NB		 754 struct se_cmd *cmd,
755 int t_state)
756{
757 struct se_device *dev = cmd->se_dev;
e3d6f909 758 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 759 unsigned long flags;
760
5951146d 761 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db
NB		 762
763 if (t_state) {
a1d8b49a 764 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 765 cmd->t_state = t_state;
a1d8b49a
AG		 766 atomic_set(&cmd->t_transport_active, 1);
767 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 768 }
769
770 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
5951146d 771 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
a1d8b49a 772 atomic_inc(&cmd->t_transport_queue_active);
c66ac9db
NB		 773 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
774
775 atomic_inc(&qobj->queue_cnt);
776 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 777}
778
5951146d
AG		 779static struct se_cmd *
780transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 781{
5951146d 782 struct se_cmd *cmd;
c66ac9db
NB		 783 unsigned long flags;
784
785 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
786 if (list_empty(&qobj->qobj_list)) {
787 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
788 return NULL;
789 }
5951146d 790 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 791
a1d8b49a 792 atomic_dec(&cmd->t_transport_queue_active);
c66ac9db 793
5951146d 794 list_del(&cmd->se_queue_node);
c66ac9db
NB		 795 atomic_dec(&qobj->queue_cnt);
796 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
797
5951146d 798 return cmd;
c66ac9db
NB		 799}
800
801static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
802 struct se_queue_obj *qobj)
803{
5951146d 804 struct se_cmd *t;
c66ac9db
NB		 805 unsigned long flags;
806
807 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
a1d8b49a 808 if (!(atomic_read(&cmd->t_transport_queue_active))) {
c66ac9db
NB		 809 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
810 return;
811 }
812
5951146d
AG		 813 list_for_each_entry(t, &qobj->qobj_list, se_queue_node)
814 if (t == cmd) {
a1d8b49a 815 atomic_dec(&cmd->t_transport_queue_active);
5951146d
AG		 816 atomic_dec(&qobj->queue_cnt);
817 list_del(&cmd->se_queue_node);
818 break;
819 }
c66ac9db
NB		 820 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
821
a1d8b49a 822 if (atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db 823 printk(KERN_ERR "ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 824 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 825 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 826 }
827}
828
829/*
830 * Completion function used by TCM subsystem plugins (such as FILEIO)
831 * for queueing up response from struct se_subsystem_api->do_task()
832 */
833void transport_complete_sync_cache(struct se_cmd *cmd, int good)
834{
a1d8b49a 835 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 836 struct se_task, t_list);
837
838 if (good) {
839 cmd->scsi_status = SAM_STAT_GOOD;
840 task->task_scsi_status = GOOD;
841 } else {
842 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
843 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 844 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 845 PYX_TRANSPORT_ILLEGAL_REQUEST;
846 }
847
848 transport_complete_task(task, good);
849}
850EXPORT_SYMBOL(transport_complete_sync_cache);
851
852/* transport_complete_task():
853 *
854 * Called from interrupt and non interrupt context depending
855 * on the transport plugin.
856 */
857void transport_complete_task(struct se_task *task, int success)
858{
e3d6f909 859 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 860 struct se_device *dev = task->se_dev;
861 int t_state;
862 unsigned long flags;
863#if 0
864 printk(KERN_INFO "task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 865 cmd->t_task_cdb[0], dev);
c66ac9db 866#endif
e3d6f909 867 if (dev)
c66ac9db 868 atomic_inc(&dev->depth_left);
c66ac9db 869
a1d8b49a 870 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 871 atomic_set(&task->task_active, 0);
872
873 /*
874 * See if any sense data exists, if so set the TASK_SENSE flag.
875 * Also check for any other post completion work that needs to be
876 * done by the plugins.
877 */
878 if (dev && dev->transport->transport_complete) {
879 if (dev->transport->transport_complete(task) != 0) {
880 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
881 task->task_sense = 1;
882 success = 1;
883 }
884 }
885
886 /*
887 * See if we are waiting for outstanding struct se_task
888 * to complete for an exception condition
889 */
890 if (atomic_read(&task->task_stop)) {
891 /*
a1d8b49a 892 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 893 * previously thrown its timeout exception handler.
894 */
895 if (atomic_read(&task->task_timeout)) {
a1d8b49a 896 atomic_dec(&cmd->t_se_count);
c66ac9db
NB		 897 atomic_set(&task->task_timeout, 0);
898 }
a1d8b49a 899 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 900
901 complete(&task->task_stop_comp);
902 return;
903 }
904 /*
905 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
906 * left counter to determine when the struct se_cmd is ready to be queued to
907 * the processing thread.
908 */
909 if (atomic_read(&task->task_timeout)) {
910 if (!(atomic_dec_and_test(
a1d8b49a
AG		 911 &cmd->t_task_cdbs_timeout_left))) {
912 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 913 flags);
914 return;
915 }
916 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 917 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 918
919 transport_add_cmd_to_queue(cmd, t_state);
920 return;
921 }
a1d8b49a 922 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 923
924 /*
925 * Decrement the outstanding t_task_cdbs_left count. The last
926 * struct se_task from struct se_cmd will complete itself into the
927 * device queue depending upon int success.
928 */
a1d8b49a 929 if (!(atomic_dec_and_test(&cmd->t_task_cdbs_left))) {
c66ac9db 930 if (!success)
a1d8b49a 931 cmd->t_tasks_failed = 1;
c66ac9db 932
a1d8b49a 933 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 934 return;
935 }
936
a1d8b49a 937 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 938 t_state = TRANSPORT_COMPLETE_FAILURE;
939 if (!task->task_error_status) {
940 task->task_error_status =
941 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
942 cmd->transport_error_status =
943 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
944 }
945 } else {
a1d8b49a 946 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 947 t_state = TRANSPORT_COMPLETE_OK;
948 }
a1d8b49a 949 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 950
951 transport_add_cmd_to_queue(cmd, t_state);
952}
953EXPORT_SYMBOL(transport_complete_task);
954
955/*
956 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
957 * struct se_task list are ready to be added to the active execution list
958 * struct se_device
959
960 * Called with se_dev_t->execute_task_lock called.
961 */
962static inline int transport_add_task_check_sam_attr(
963 struct se_task *task,
964 struct se_task *task_prev,
965 struct se_device *dev)
966{
967 /*
968 * No SAM Task attribute emulation enabled, add to tail of
969 * execution queue
970 */
971 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
972 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
973 return 0;
974 }
975 /*
976 * HEAD_OF_QUEUE attribute for received CDB, which means
977 * the first task that is associated with a struct se_cmd goes to
978 * head of the struct se_device->execute_task_list, and task_prev
979 * after that for each subsequent task
980 */
e66ecd50 981 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 982 list_add(&task->t_execute_list,
983 (task_prev != NULL) ?
984 &task_prev->t_execute_list :
985 &dev->execute_task_list);
986
987 DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
988 " in execution queue\n",
989 T_TASK(task->task_se_cmd)->t_task_cdb[0]);
990 return 1;
991 }
992 /*
993 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
994 * transitioned from Dermant -> Active state, and are added to the end
995 * of the struct se_device->execute_task_list
996 */
997 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
998 return 0;
999}
1000
1001/* __transport_add_task_to_execute_queue():
1002 *
1003 * Called with se_dev_t->execute_task_lock called.
1004 */
1005static void __transport_add_task_to_execute_queue(
1006 struct se_task *task,
1007 struct se_task *task_prev,
1008 struct se_device *dev)
1009{
1010 int head_of_queue;
1011
1012 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
1013 atomic_inc(&dev->execute_tasks);
1014
1015 if (atomic_read(&task->task_state_active))
1016 return;
1017 /*
1018 * Determine if this task needs to go to HEAD_OF_QUEUE for the
1019 * state list as well. Running with SAM Task Attribute emulation
1020 * will always return head_of_queue == 0 here
1021 */
1022 if (head_of_queue)
1023 list_add(&task->t_state_list, (task_prev) ?
1024 &task_prev->t_state_list :
1025 &dev->state_task_list);
1026 else
1027 list_add_tail(&task->t_state_list, &dev->state_task_list);
1028
1029 atomic_set(&task->task_state_active, 1);
1030
1031 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 1032 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 1033 task, dev);
1034}
1035
1036static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
1037{
1038 struct se_device *dev;
1039 struct se_task *task;
1040 unsigned long flags;
1041
a1d8b49a
AG		 1042 spin_lock_irqsave(&cmd->t_state_lock, flags);
1043 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 1044 dev = task->se_dev;
1045
1046 if (atomic_read(&task->task_state_active))
1047 continue;
1048
1049 spin_lock(&dev->execute_task_lock);
1050 list_add_tail(&task->t_state_list, &dev->state_task_list);
1051 atomic_set(&task->task_state_active, 1);
1052
1053 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 1054 task->se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 1055 task->task_se_cmd), task, dev);
1056
1057 spin_unlock(&dev->execute_task_lock);
1058 }
a1d8b49a 1059 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1060}
1061
1062static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
1063{
5951146d 1064 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1065 struct se_task *task, *task_prev = NULL;
1066 unsigned long flags;
1067
1068 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 1069 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 1070 if (atomic_read(&task->task_execute_queue))
1071 continue;
1072 /*
1073 * __transport_add_task_to_execute_queue() handles the
1074 * SAM Task Attribute emulation if enabled
1075 */
1076 __transport_add_task_to_execute_queue(task, task_prev, dev);
1077 atomic_set(&task->task_execute_queue, 1);
1078 task_prev = task;
1079 }
1080 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 1081}
1082
1083/* transport_remove_task_from_execute_queue():
1084 *
1085 *
1086 */
52208ae3 1087void transport_remove_task_from_execute_queue(
c66ac9db
NB		 1088 struct se_task *task,
1089 struct se_device *dev)
1090{
1091 unsigned long flags;
1092
af57c3ac
NB		 1093 if (atomic_read(&task->task_execute_queue) == 0) {
1094 dump_stack();
1095 return;
1096 }
1097
c66ac9db
NB		 1098 spin_lock_irqsave(&dev->execute_task_lock, flags);
1099 list_del(&task->t_execute_list);
af57c3ac 1100 atomic_set(&task->task_execute_queue, 0);
c66ac9db
NB		 1101 atomic_dec(&dev->execute_tasks);
1102 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
1103}
1104
1105unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1106{
1107 switch (cmd->data_direction) {
1108 case DMA_NONE:
1109 return "NONE";
1110 case DMA_FROM_DEVICE:
1111 return "READ";
1112 case DMA_TO_DEVICE:
1113 return "WRITE";
1114 case DMA_BIDIRECTIONAL:
1115 return "BIDI";
1116 default:
1117 break;
1118 }
1119
1120 return "UNKNOWN";
1121}
1122
1123void transport_dump_dev_state(
1124 struct se_device *dev,
1125 char *b,
1126 int *bl)
1127{
1128 *bl += sprintf(b + *bl, "Status: ");
1129 switch (dev->dev_status) {
1130 case TRANSPORT_DEVICE_ACTIVATED:
1131 *bl += sprintf(b + *bl, "ACTIVATED");
1132 break;
1133 case TRANSPORT_DEVICE_DEACTIVATED:
1134 *bl += sprintf(b + *bl, "DEACTIVATED");
1135 break;
1136 case TRANSPORT_DEVICE_SHUTDOWN:
1137 *bl += sprintf(b + *bl, "SHUTDOWN");
1138 break;
1139 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1140 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1141 *bl += sprintf(b + *bl, "OFFLINE");
1142 break;
1143 default:
1144 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1145 break;
1146 }
1147
1148 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1149 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1150 dev->queue_depth);
1151 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1152 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1153 *bl += sprintf(b + *bl, " ");
1154}
1155
1156/* transport_release_all_cmds():
1157 *
1158 *
1159 */
1160static void transport_release_all_cmds(struct se_device *dev)
1161{
5951146d 1162 struct se_cmd *cmd, *tcmd;
c66ac9db
NB		 1163 int bug_out = 0, t_state;
1164 unsigned long flags;
1165
e3d6f909 1166 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
5951146d
AG		 1167 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1168 se_queue_node) {
1169 t_state = cmd->t_state;
1170 list_del(&cmd->se_queue_node);
e3d6f909 1171 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
c66ac9db
NB		 1172 flags);
1173
1174 printk(KERN_ERR "Releasing ITT: 0x%08x, i_state: %u,"
1175 " t_state: %u directly\n",
e3d6f909
AG		 1176 cmd->se_tfo->get_task_tag(cmd),
1177 cmd->se_tfo->get_cmd_state(cmd), t_state);
c66ac9db
NB		 1178
1179 transport_release_fe_cmd(cmd);
1180 bug_out = 1;
1181
e3d6f909 1182 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db 1183 }
e3d6f909 1184 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db
NB		 1185#if 0
1186 if (bug_out)
1187 BUG();
1188#endif
1189}
1190
1191void transport_dump_vpd_proto_id(
1192 struct t10_vpd *vpd,
1193 unsigned char *p_buf,
1194 int p_buf_len)
1195{
1196 unsigned char buf[VPD_TMP_BUF_SIZE];
1197 int len;
1198
1199 memset(buf, 0, VPD_TMP_BUF_SIZE);
1200 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1201
1202 switch (vpd->protocol_identifier) {
1203 case 0x00:
1204 sprintf(buf+len, "Fibre Channel\n");
1205 break;
1206 case 0x10:
1207 sprintf(buf+len, "Parallel SCSI\n");
1208 break;
1209 case 0x20:
1210 sprintf(buf+len, "SSA\n");
1211 break;
1212 case 0x30:
1213 sprintf(buf+len, "IEEE 1394\n");
1214 break;
1215 case 0x40:
1216 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1217 " Protocol\n");
1218 break;
1219 case 0x50:
1220 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1221 break;
1222 case 0x60:
1223 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1224 break;
1225 case 0x70:
1226 sprintf(buf+len, "Automation/Drive Interface Transport"
1227 " Protocol\n");
1228 break;
1229 case 0x80:
1230 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1231 break;
1232 default:
1233 sprintf(buf+len, "Unknown 0x%02x\n",
1234 vpd->protocol_identifier);
1235 break;
1236 }
1237
1238 if (p_buf)
1239 strncpy(p_buf, buf, p_buf_len);
1240 else
1241 printk(KERN_INFO "%s", buf);
1242}
1243
1244void
1245transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1246{
1247 /*
1248 * Check if the Protocol Identifier Valid (PIV) bit is set..
1249 *
1250 * from spc3r23.pdf section 7.5.1
1251 */
1252 if (page_83[1] & 0x80) {
1253 vpd->protocol_identifier = (page_83[0] & 0xf0);
1254 vpd->protocol_identifier_set = 1;
1255 transport_dump_vpd_proto_id(vpd, NULL, 0);
1256 }
1257}
1258EXPORT_SYMBOL(transport_set_vpd_proto_id);
1259
1260int transport_dump_vpd_assoc(
1261 struct t10_vpd *vpd,
1262 unsigned char *p_buf,
1263 int p_buf_len)
1264{
1265 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1266 int ret = 0;
1267 int len;
c66ac9db
NB		 1268
1269 memset(buf, 0, VPD_TMP_BUF_SIZE);
1270 len = sprintf(buf, "T10 VPD Identifier Association: ");
1271
1272 switch (vpd->association) {
1273 case 0x00:
1274 sprintf(buf+len, "addressed logical unit\n");
1275 break;
1276 case 0x10:
1277 sprintf(buf+len, "target port\n");
1278 break;
1279 case 0x20:
1280 sprintf(buf+len, "SCSI target device\n");
1281 break;
1282 default:
1283 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1284 ret = -EINVAL;
c66ac9db
NB		 1285 break;
1286 }
1287
1288 if (p_buf)
1289 strncpy(p_buf, buf, p_buf_len);
1290 else
1291 printk("%s", buf);
1292
1293 return ret;
1294}
1295
1296int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1297{
1298 /*
1299 * The VPD identification association..
1300 *
1301 * from spc3r23.pdf Section 7.6.3.1 Table 297
1302 */
1303 vpd->association = (page_83[1] & 0x30);
1304 return transport_dump_vpd_assoc(vpd, NULL, 0);
1305}
1306EXPORT_SYMBOL(transport_set_vpd_assoc);
1307
1308int transport_dump_vpd_ident_type(
1309 struct t10_vpd *vpd,
1310 unsigned char *p_buf,
1311 int p_buf_len)
1312{
1313 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1314 int ret = 0;
1315 int len;
c66ac9db
NB		 1316
1317 memset(buf, 0, VPD_TMP_BUF_SIZE);
1318 len = sprintf(buf, "T10 VPD Identifier Type: ");
1319
1320 switch (vpd->device_identifier_type) {
1321 case 0x00:
1322 sprintf(buf+len, "Vendor specific\n");
1323 break;
1324 case 0x01:
1325 sprintf(buf+len, "T10 Vendor ID based\n");
1326 break;
1327 case 0x02:
1328 sprintf(buf+len, "EUI-64 based\n");
1329 break;
1330 case 0x03:
1331 sprintf(buf+len, "NAA\n");
1332 break;
1333 case 0x04:
1334 sprintf(buf+len, "Relative target port identifier\n");
1335 break;
1336 case 0x08:
1337 sprintf(buf+len, "SCSI name string\n");
1338 break;
1339 default:
1340 sprintf(buf+len, "Unsupported: 0x%02x\n",
1341 vpd->device_identifier_type);
e3d6f909 1342 ret = -EINVAL;
c66ac9db
NB		 1343 break;
1344 }
1345
e3d6f909
AG		 1346 if (p_buf) {
1347 if (p_buf_len < strlen(buf)+1)
1348 return -EINVAL;
c66ac9db 1349 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1350 } else {
c66ac9db 1351 printk("%s", buf);
e3d6f909 1352 }
c66ac9db
NB		 1353
1354 return ret;
1355}
1356
1357int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1358{
1359 /*
1360 * The VPD identifier type..
1361 *
1362 * from spc3r23.pdf Section 7.6.3.1 Table 298
1363 */
1364 vpd->device_identifier_type = (page_83[1] & 0x0f);
1365 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1366}
1367EXPORT_SYMBOL(transport_set_vpd_ident_type);
1368
1369int transport_dump_vpd_ident(
1370 struct t10_vpd *vpd,
1371 unsigned char *p_buf,
1372 int p_buf_len)
1373{
1374 unsigned char buf[VPD_TMP_BUF_SIZE];
1375 int ret = 0;
1376
1377 memset(buf, 0, VPD_TMP_BUF_SIZE);
1378
1379 switch (vpd->device_identifier_code_set) {
1380 case 0x01: /* Binary */
1381 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1382 &vpd->device_identifier[0]);
1383 break;
1384 case 0x02: /* ASCII */
1385 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1386 &vpd->device_identifier[0]);
1387 break;
1388 case 0x03: /* UTF-8 */
1389 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1390 &vpd->device_identifier[0]);
1391 break;
1392 default:
1393 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1394 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1395 ret = -EINVAL;
c66ac9db
NB		 1396 break;
1397 }
1398
1399 if (p_buf)
1400 strncpy(p_buf, buf, p_buf_len);
1401 else
1402 printk("%s", buf);
1403
1404 return ret;
1405}
1406
1407int
1408transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1409{
1410 static const char hex_str[] = "0123456789abcdef";
1411 int j = 0, i = 4; /* offset to start of the identifer */
1412
1413 /*
1414 * The VPD Code Set (encoding)
1415 *
1416 * from spc3r23.pdf Section 7.6.3.1 Table 296
1417 */
1418 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1419 switch (vpd->device_identifier_code_set) {
1420 case 0x01: /* Binary */
1421 vpd->device_identifier[j++] =
1422 hex_str[vpd->device_identifier_type];
1423 while (i < (4 + page_83[3])) {
1424 vpd->device_identifier[j++] =
1425 hex_str[(page_83[i] & 0xf0) >> 4];
1426 vpd->device_identifier[j++] =
1427 hex_str[page_83[i] & 0x0f];
1428 i++;
1429 }
1430 break;
1431 case 0x02: /* ASCII */
1432 case 0x03: /* UTF-8 */
1433 while (i < (4 + page_83[3]))
1434 vpd->device_identifier[j++] = page_83[i++];
1435 break;
1436 default:
1437 break;
1438 }
1439
1440 return transport_dump_vpd_ident(vpd, NULL, 0);
1441}
1442EXPORT_SYMBOL(transport_set_vpd_ident);
1443
1444static void core_setup_task_attr_emulation(struct se_device *dev)
1445{
1446 /*
1447 * If this device is from Target_Core_Mod/pSCSI, disable the
1448 * SAM Task Attribute emulation.
1449 *
1450 * This is currently not available in upsream Linux/SCSI Target
1451 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1452 */
e3d6f909 1453 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1454 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1455 return;
1456 }
1457
1458 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1459 DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1460 " device\n", dev->transport->name,
1461 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1462}
1463
1464static void scsi_dump_inquiry(struct se_device *dev)
1465{
e3d6f909 1466 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1467 int i, device_type;
1468 /*
1469 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1470 */
1471 printk(" Vendor: ");
1472 for (i = 0; i < 8; i++)
1473 if (wwn->vendor[i] >= 0x20)
1474 printk("%c", wwn->vendor[i]);
1475 else
1476 printk(" ");
1477
1478 printk(" Model: ");
1479 for (i = 0; i < 16; i++)
1480 if (wwn->model[i] >= 0x20)
1481 printk("%c", wwn->model[i]);
1482 else
1483 printk(" ");
1484
1485 printk(" Revision: ");
1486 for (i = 0; i < 4; i++)
1487 if (wwn->revision[i] >= 0x20)
1488 printk("%c", wwn->revision[i]);
1489 else
1490 printk(" ");
1491
1492 printk("\n");
1493
e3d6f909 1494 device_type = dev->transport->get_device_type(dev);
c66ac9db
NB		 1495 printk(" Type: %s ", scsi_device_type(device_type));
1496 printk(" ANSI SCSI revision: %02x\n",
e3d6f909 1497 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1498}
1499
1500struct se_device *transport_add_device_to_core_hba(
1501 struct se_hba *hba,
1502 struct se_subsystem_api *transport,
1503 struct se_subsystem_dev *se_dev,
1504 u32 device_flags,
1505 void *transport_dev,
1506 struct se_dev_limits *dev_limits,
1507 const char *inquiry_prod,
1508 const char *inquiry_rev)
1509{
12a18bdc 1510 int force_pt;
c66ac9db
NB		 1511 struct se_device *dev;
1512
1513 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1514 if (!(dev)) {
1515 printk(KERN_ERR "Unable to allocate memory for se_dev_t\n");
1516 return NULL;
1517 }
c66ac9db 1518
e3d6f909 1519 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1520 dev->dev_flags = device_flags;
1521 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1522 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1523 dev->se_hba = hba;
1524 dev->se_sub_dev = se_dev;
1525 dev->transport = transport;
1526 atomic_set(&dev->active_cmds, 0);
1527 INIT_LIST_HEAD(&dev->dev_list);
1528 INIT_LIST_HEAD(&dev->dev_sep_list);
1529 INIT_LIST_HEAD(&dev->dev_tmr_list);
1530 INIT_LIST_HEAD(&dev->execute_task_list);
1531 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1532 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1533 INIT_LIST_HEAD(&dev->state_task_list);
1534 spin_lock_init(&dev->execute_task_lock);
1535 spin_lock_init(&dev->delayed_cmd_lock);
1536 spin_lock_init(&dev->ordered_cmd_lock);
1537 spin_lock_init(&dev->state_task_lock);
1538 spin_lock_init(&dev->dev_alua_lock);
1539 spin_lock_init(&dev->dev_reservation_lock);
1540 spin_lock_init(&dev->dev_status_lock);
1541 spin_lock_init(&dev->dev_status_thr_lock);
1542 spin_lock_init(&dev->se_port_lock);
1543 spin_lock_init(&dev->se_tmr_lock);
1544
1545 dev->queue_depth = dev_limits->queue_depth;
1546 atomic_set(&dev->depth_left, dev->queue_depth);
1547 atomic_set(&dev->dev_ordered_id, 0);
1548
1549 se_dev_set_default_attribs(dev, dev_limits);
1550
1551 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1552 dev->creation_time = get_jiffies_64();
1553 spin_lock_init(&dev->stats_lock);
1554
1555 spin_lock(&hba->device_lock);
1556 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1557 hba->dev_count++;
1558 spin_unlock(&hba->device_lock);
1559 /*
1560 * Setup the SAM Task Attribute emulation for struct se_device
1561 */
1562 core_setup_task_attr_emulation(dev);
1563 /*
1564 * Force PR and ALUA passthrough emulation with internal object use.
1565 */
1566 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1567 /*
1568 * Setup the Reservations infrastructure for struct se_device
1569 */
1570 core_setup_reservations(dev, force_pt);
1571 /*
1572 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1573 */
1574 if (core_setup_alua(dev, force_pt) < 0)
1575 goto out;
1576
1577 /*
1578 * Startup the struct se_device processing thread
1579 */
1580 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1581 "LIO_%s", dev->transport->name);
c66ac9db
NB		 1582 if (IS_ERR(dev->process_thread)) {
1583 printk(KERN_ERR "Unable to create kthread: LIO_%s\n",
e3d6f909 1584 dev->transport->name);
c66ac9db
NB		 1585 goto out;
1586 }
1587
1588 /*
1589 * Preload the initial INQUIRY const values if we are doing
1590 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1591 * passthrough because this is being provided by the backend LLD.
1592 * This is required so that transport_get_inquiry() copies these
1593 * originals once back into DEV_T10_WWN(dev) for the virtual device
1594 * setup.
1595 */
e3d6f909 1596 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1597 if (!inquiry_prod || !inquiry_rev) {
c66ac9db
NB		 1598 printk(KERN_ERR "All non TCM/pSCSI plugins require"
1599 " INQUIRY consts\n");
1600 goto out;
1601 }
1602
e3d6f909
AG		 1603 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1604 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1605 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1606 }
1607 scsi_dump_inquiry(dev);
1608
12a18bdc 1609 return dev;
c66ac9db 1610out:
c66ac9db
NB		 1611 kthread_stop(dev->process_thread);
1612
1613 spin_lock(&hba->device_lock);
1614 list_del(&dev->dev_list);
1615 hba->dev_count--;
1616 spin_unlock(&hba->device_lock);
1617
1618 se_release_vpd_for_dev(dev);
1619
c66ac9db
NB		 1620 kfree(dev);
1621
1622 return NULL;
1623}
1624EXPORT_SYMBOL(transport_add_device_to_core_hba);
1625
1626/* transport_generic_prepare_cdb():
1627 *
1628 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1629 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1630 * The point of this is since we are mapping iSCSI LUNs to
1631 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1632 * devices and HBAs for a loop.
1633 */
1634static inline void transport_generic_prepare_cdb(
1635 unsigned char *cdb)
1636{
1637 switch (cdb[0]) {
1638 case READ_10: /* SBC - RDProtect */
1639 case READ_12: /* SBC - RDProtect */
1640 case READ_16: /* SBC - RDProtect */
1641 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1642 case VERIFY: /* SBC - VRProtect */
1643 case VERIFY_16: /* SBC - VRProtect */
1644 case WRITE_VERIFY: /* SBC - VRProtect */
1645 case WRITE_VERIFY_12: /* SBC - VRProtect */
1646 break;
1647 default:
1648 cdb[1] &= 0x1f; /* clear logical unit number */
1649 break;
1650 }
1651}
1652
1653static struct se_task *
1654transport_generic_get_task(struct se_cmd *cmd,
1655 enum dma_data_direction data_direction)
1656{
1657 struct se_task *task;
5951146d 1658 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1659 unsigned long flags;
1660
1661 task = dev->transport->alloc_task(cmd);
1662 if (!task) {
1663 printk(KERN_ERR "Unable to allocate struct se_task\n");
1664 return NULL;
1665 }
1666
1667 INIT_LIST_HEAD(&task->t_list);
1668 INIT_LIST_HEAD(&task->t_execute_list);
1669 INIT_LIST_HEAD(&task->t_state_list);
1670 init_completion(&task->task_stop_comp);
c66ac9db
NB		 1671 task->task_se_cmd = cmd;
1672 task->se_dev = dev;
1673 task->task_data_direction = data_direction;
1674
a1d8b49a
AG		 1675 spin_lock_irqsave(&cmd->t_state_lock, flags);
1676 list_add_tail(&task->t_list, &cmd->t_task_list);
1677 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1678
1679 return task;
1680}
1681
1682static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1683
c66ac9db
NB		 1684/*
1685 * Used by fabric modules containing a local struct se_cmd within their
1686 * fabric dependent per I/O descriptor.
1687 */
1688void transport_init_se_cmd(
1689 struct se_cmd *cmd,
1690 struct target_core_fabric_ops *tfo,
1691 struct se_session *se_sess,
1692 u32 data_length,
1693 int data_direction,
1694 int task_attr,
1695 unsigned char *sense_buffer)
1696{
5951146d
AG		 1697 INIT_LIST_HEAD(&cmd->se_lun_node);
1698 INIT_LIST_HEAD(&cmd->se_delayed_node);
1699 INIT_LIST_HEAD(&cmd->se_ordered_node);
c66ac9db 1700
a1d8b49a
AG		 1701 INIT_LIST_HEAD(&cmd->t_mem_list);
1702 INIT_LIST_HEAD(&cmd->t_mem_bidi_list);
1703 INIT_LIST_HEAD(&cmd->t_task_list);
1704 init_completion(&cmd->transport_lun_fe_stop_comp);
1705 init_completion(&cmd->transport_lun_stop_comp);
1706 init_completion(&cmd->t_transport_stop_comp);
1707 spin_lock_init(&cmd->t_state_lock);
1708 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1709
1710 cmd->se_tfo = tfo;
1711 cmd->se_sess = se_sess;
1712 cmd->data_length = data_length;
1713 cmd->data_direction = data_direction;
1714 cmd->sam_task_attr = task_attr;
1715 cmd->sense_buffer = sense_buffer;
1716}
1717EXPORT_SYMBOL(transport_init_se_cmd);
1718
1719static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1720{
1721 /*
1722 * Check if SAM Task Attribute emulation is enabled for this
1723 * struct se_device storage object
1724 */
5951146d 1725 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1726 return 0;
1727
e66ecd50 1728 if (cmd->sam_task_attr == MSG_ACA_TAG) {
c66ac9db
NB		 1729 DEBUG_STA("SAM Task Attribute ACA"
1730 " emulation is not supported\n");
e3d6f909 1731 return -EINVAL;
c66ac9db
NB		 1732 }
1733 /*
1734 * Used to determine when ORDERED commands should go from
1735 * Dormant to Active status.
1736 */
5951146d 1737 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db
NB		 1738 smp_mb__after_atomic_inc();
1739 DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1740 cmd->se_ordered_id, cmd->sam_task_attr,
1741 TRANSPORT(cmd->se_dev)->name);
1742 return 0;
1743}
1744
1745void transport_free_se_cmd(
1746 struct se_cmd *se_cmd)
1747{
1748 if (se_cmd->se_tmr_req)
1749 core_tmr_release_req(se_cmd->se_tmr_req);
1750 /*
1751 * Check and free any extended CDB buffer that was allocated
1752 */
a1d8b49a
AG		 1753 if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
1754 kfree(se_cmd->t_task_cdb);
c66ac9db
NB		 1755}
1756EXPORT_SYMBOL(transport_free_se_cmd);
1757
1758static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1759
1760/* transport_generic_allocate_tasks():
1761 *
1762 * Called from fabric RX Thread.
1763 */
1764int transport_generic_allocate_tasks(
1765 struct se_cmd *cmd,
1766 unsigned char *cdb)
1767{
1768 int ret;
1769
1770 transport_generic_prepare_cdb(cdb);
1771
1772 /*
1773 * This is needed for early exceptions.
1774 */
1775 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1776
c66ac9db
NB		 1777 /*
1778 * Ensure that the received CDB is less than the max (252 + 8) bytes
1779 * for VARIABLE_LENGTH_CMD
1780 */
1781 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1782 printk(KERN_ERR "Received SCSI CDB with command_size: %d that"
1783 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1784 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1785 return -EINVAL;
c66ac9db
NB		 1786 }
1787 /*
1788 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1789 * allocate the additional extended CDB buffer now.. Otherwise
1790 * setup the pointer from __t_task_cdb to t_task_cdb.
1791 */
a1d8b49a
AG		 1792 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1793 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1794 GFP_KERNEL);
a1d8b49a
AG		 1795 if (!(cmd->t_task_cdb)) {
1796 printk(KERN_ERR "Unable to allocate cmd->t_task_cdb"
1797 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1798 scsi_command_size(cdb),
a1d8b49a 1799 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1800 return -ENOMEM;
c66ac9db
NB		 1801 }
1802 } else
a1d8b49a 1803 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1804 /*
a1d8b49a 1805 * Copy the original CDB into cmd->
c66ac9db 1806 */
a1d8b49a 1807 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1808 /*
1809 * Setup the received CDB based on SCSI defined opcodes and
1810 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1811 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1812 * pointer is expected to be setup before we reach this point.
1813 */
1814 ret = transport_generic_cmd_sequencer(cmd, cdb);
1815 if (ret < 0)
1816 return ret;
1817 /*
1818 * Check for SAM Task Attribute Emulation
1819 */
1820 if (transport_check_alloc_task_attr(cmd) < 0) {
1821 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1822 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1823 return -EINVAL;
c66ac9db
NB		 1824 }
1825 spin_lock(&cmd->se_lun->lun_sep_lock);
1826 if (cmd->se_lun->lun_sep)
1827 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1828 spin_unlock(&cmd->se_lun->lun_sep_lock);
1829 return 0;
1830}
1831EXPORT_SYMBOL(transport_generic_allocate_tasks);
1832
1833/*
1834 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1835 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1836 */
1837int transport_generic_handle_cdb(
1838 struct se_cmd *cmd)
1839{
e3d6f909 1840 if (!cmd->se_lun) {
c66ac9db 1841 dump_stack();
e3d6f909
AG		 1842 printk(KERN_ERR "cmd->se_lun is NULL\n");
1843 return -EINVAL;
c66ac9db 1844 }
695434e1 1845
c66ac9db
NB		 1846 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1847 return 0;
1848}
1849EXPORT_SYMBOL(transport_generic_handle_cdb);
1850
695434e1
NB		 1851/*
1852 * Used by fabric module frontends to queue tasks directly.
1853 * Many only be used from process context only
1854 */
1855int transport_handle_cdb_direct(
1856 struct se_cmd *cmd)
1857{
1858 if (!cmd->se_lun) {
1859 dump_stack();
1860 printk(KERN_ERR "cmd->se_lun is NULL\n");
1861 return -EINVAL;
1862 }
1863 if (in_interrupt()) {
1864 dump_stack();
1865 printk(KERN_ERR "transport_generic_handle_cdb cannot be called"
1866 " from interrupt context\n");
1867 return -EINVAL;
1868 }
1869
1870 return transport_generic_new_cmd(cmd);
1871}
1872EXPORT_SYMBOL(transport_handle_cdb_direct);
1873
c66ac9db
NB		 1874/*
1875 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1876 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1877 * complete setup in TCM process context w/ TFO->new_cmd_map().
1878 */
1879int transport_generic_handle_cdb_map(
1880 struct se_cmd *cmd)
1881{
e3d6f909 1882 if (!cmd->se_lun) {
c66ac9db 1883 dump_stack();
e3d6f909
AG		 1884 printk(KERN_ERR "cmd->se_lun is NULL\n");
1885 return -EINVAL;
c66ac9db
NB		 1886 }
1887
1888 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1889 return 0;
1890}
1891EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1892
1893/* transport_generic_handle_data():
1894 *
1895 *
1896 */
1897int transport_generic_handle_data(
1898 struct se_cmd *cmd)
1899{
1900 /*
1901 * For the software fabric case, then we assume the nexus is being
1902 * failed/shutdown when signals are pending from the kthread context
1903 * caller, so we return a failure. For the HW target mode case running
1904 * in interrupt code, the signal_pending() check is skipped.
1905 */
1906 if (!in_interrupt() && signal_pending(current))
e3d6f909 1907 return -EPERM;
c66ac9db
NB		 1908 /*
1909 * If the received CDB has aleady been ABORTED by the generic
1910 * target engine, we now call transport_check_aborted_status()
1911 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1912 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1913 * sequences at this point.
1914 */
1915 if (transport_check_aborted_status(cmd, 1) != 0)
1916 return 0;
1917
1918 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1919 return 0;
1920}
1921EXPORT_SYMBOL(transport_generic_handle_data);
1922
1923/* transport_generic_handle_tmr():
1924 *
1925 *
1926 */
1927int transport_generic_handle_tmr(
1928 struct se_cmd *cmd)
1929{
1930 /*
1931 * This is needed for early exceptions.
1932 */
1933 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
c66ac9db
NB		 1934
1935 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1936 return 0;
1937}
1938EXPORT_SYMBOL(transport_generic_handle_tmr);
1939
f4366772
NB		 1940void transport_generic_free_cmd_intr(
1941 struct se_cmd *cmd)
1942{
1943 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1944}
1945EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1946
c66ac9db
NB		 1947static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1948{
1949 struct se_task *task, *task_tmp;
1950 unsigned long flags;
1951 int ret = 0;
1952
1953 DEBUG_TS("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1954 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1955
1956 /*
1957 * No tasks remain in the execution queue
1958 */
a1d8b49a 1959 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1960 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1961 &cmd->t_task_list, t_list) {
c66ac9db
NB		 1962 DEBUG_TS("task_no[%d] - Processing task %p\n",
1963 task->task_no, task);
1964 /*
1965 * If the struct se_task has not been sent and is not active,
1966 * remove the struct se_task from the execution queue.
1967 */
1968 if (!atomic_read(&task->task_sent) &&
1969 !atomic_read(&task->task_active)) {
a1d8b49a 1970 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1971 flags);
1972 transport_remove_task_from_execute_queue(task,
1973 task->se_dev);
1974
1975 DEBUG_TS("task_no[%d] - Removed from execute queue\n",
1976 task->task_no);
a1d8b49a 1977 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1978 continue;
1979 }
1980
1981 /*
1982 * If the struct se_task is active, sleep until it is returned
1983 * from the plugin.
1984 */
1985 if (atomic_read(&task->task_active)) {
1986 atomic_set(&task->task_stop, 1);
a1d8b49a 1987 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1988 flags);
1989
1990 DEBUG_TS("task_no[%d] - Waiting to complete\n",
1991 task->task_no);
1992 wait_for_completion(&task->task_stop_comp);
1993 DEBUG_TS("task_no[%d] - Stopped successfully\n",
1994 task->task_no);
1995
a1d8b49a
AG		 1996 spin_lock_irqsave(&cmd->t_state_lock, flags);
1997 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 1998
1999 atomic_set(&task->task_active, 0);
2000 atomic_set(&task->task_stop, 0);
2001 } else {
2002 DEBUG_TS("task_no[%d] - Did nothing\n", task->task_no);
2003 ret++;
2004 }
2005
2006 __transport_stop_task_timer(task, &flags);
2007 }
a1d8b49a 2008 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2009
2010 return ret;
2011}
2012
c66ac9db
NB		 2013/*
2014 * Handle SAM-esque emulation for generic transport request failures.
2015 */
2016static void transport_generic_request_failure(
2017 struct se_cmd *cmd,
2018 struct se_device *dev,
2019 int complete,
2020 int sc)
2021{
2022 DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 2023 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 2024 cmd->t_task_cdb[0]);
c66ac9db
NB		 2025 DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:"
2026 " %d/%d transport_error_status: %d\n",
e3d6f909 2027 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 2028 cmd->t_state, cmd->deferred_t_state,
2029 cmd->transport_error_status);
2030 DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d"
2031 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
2032 " t_transport_active: %d t_transport_stop: %d"
a1d8b49a
AG		 2033 " t_transport_sent: %d\n", cmd->t_task_cdbs,
2034 atomic_read(&cmd->t_task_cdbs_left),
2035 atomic_read(&cmd->t_task_cdbs_sent),
2036 atomic_read(&cmd->t_task_cdbs_ex_left),
2037 atomic_read(&cmd->t_transport_active),
2038 atomic_read(&cmd->t_transport_stop),
2039 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 2040
2041 transport_stop_all_task_timers(cmd);
2042
2043 if (dev)
e3d6f909 2044 atomic_inc(&dev->depth_left);
c66ac9db
NB		 2045 /*
2046 * For SAM Task Attribute emulation for failed struct se_cmd
2047 */
2048 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2049 transport_complete_task_attr(cmd);
2050
2051 if (complete) {
2052 transport_direct_request_timeout(cmd);
2053 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2054 }
2055
2056 switch (cmd->transport_error_status) {
2057 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
2058 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2059 break;
2060 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
2061 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
2062 break;
2063 case PYX_TRANSPORT_INVALID_CDB_FIELD:
2064 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2065 break;
2066 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
2067 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2068 break;
2069 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
2070 if (!sc)
2071 transport_new_cmd_failure(cmd);
2072 /*
2073 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2074 * we force this session to fall back to session
2075 * recovery.
2076 */
e3d6f909
AG		 2077 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
2078 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 2079
2080 goto check_stop;
2081 case PYX_TRANSPORT_LU_COMM_FAILURE:
2082 case PYX_TRANSPORT_ILLEGAL_REQUEST:
2083 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2084 break;
2085 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
2086 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
2087 break;
2088 case PYX_TRANSPORT_WRITE_PROTECTED:
2089 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
2090 break;
2091 case PYX_TRANSPORT_RESERVATION_CONFLICT:
2092 /*
2093 * No SENSE Data payload for this case, set SCSI Status
2094 * and queue the response to $FABRIC_MOD.
2095 *
2096 * Uses linux/include/scsi/scsi.h SAM status codes defs
2097 */
2098 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2099 /*
2100 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2101 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2102 * CONFLICT STATUS.
2103 *
2104 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2105 */
e3d6f909
AG		 2106 if (cmd->se_sess &&
2107 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2108 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2109 cmd->orig_fe_lun, 0x2C,
2110 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2111
e3d6f909 2112 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2113 goto check_stop;
2114 case PYX_TRANSPORT_USE_SENSE_REASON:
2115 /*
2116 * struct se_cmd->scsi_sense_reason already set
2117 */
2118 break;
2119 default:
2120 printk(KERN_ERR "Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 2121 cmd->t_task_cdb[0],
c66ac9db
NB		 2122 cmd->transport_error_status);
2123 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2124 break;
2125 }
2126
2127 if (!sc)
2128 transport_new_cmd_failure(cmd);
2129 else
2130 transport_send_check_condition_and_sense(cmd,
2131 cmd->scsi_sense_reason, 0);
2132check_stop:
2133 transport_lun_remove_cmd(cmd);
2134 if (!(transport_cmd_check_stop_to_fabric(cmd)))
2135 ;
2136}
2137
2138static void transport_direct_request_timeout(struct se_cmd *cmd)
2139{
2140 unsigned long flags;
2141
a1d8b49a
AG		 2142 spin_lock_irqsave(&cmd->t_state_lock, flags);
2143 if (!(atomic_read(&cmd->t_transport_timeout))) {
2144 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2145 return;
2146 }
a1d8b49a
AG		 2147 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2148 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2149 return;
2150 }
2151
a1d8b49a
AG		 2152 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2153 &cmd->t_se_count);
2154 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2155}
2156
2157static void transport_generic_request_timeout(struct se_cmd *cmd)
2158{
2159 unsigned long flags;
2160
2161 /*
a1d8b49a 2162 * Reset cmd->t_se_count to allow transport_generic_remove()
c66ac9db
NB		 2163 * to allow last call to free memory resources.
2164 */
a1d8b49a
AG		 2165 spin_lock_irqsave(&cmd->t_state_lock, flags);
2166 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2167 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2168
a1d8b49a 2169 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2170 }
a1d8b49a 2171 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2172
35462975 2173 transport_generic_remove(cmd, 0);
c66ac9db
NB		 2174}
2175
2176static int
2177transport_generic_allocate_buf(struct se_cmd *cmd, u32 data_length)
2178{
2179 unsigned char *buf;
2180
2181 buf = kzalloc(data_length, GFP_KERNEL);
2182 if (!(buf)) {
2183 printk(KERN_ERR "Unable to allocate memory for buffer\n");
e3d6f909 2184 return -ENOMEM;
c66ac9db
NB		 2185 }
2186
a1d8b49a
AG		 2187 cmd->t_tasks_se_num = 0;
2188 cmd->t_task_buf = buf;
c66ac9db
NB		 2189
2190 return 0;
2191}
2192
2193static inline u32 transport_lba_21(unsigned char *cdb)
2194{
2195 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2196}
2197
2198static inline u32 transport_lba_32(unsigned char *cdb)
2199{
2200 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2201}
2202
2203static inline unsigned long long transport_lba_64(unsigned char *cdb)
2204{
2205 unsigned int __v1, __v2;
2206
2207 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2208 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2209
2210 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2211}
2212
2213/*
2214 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2215 */
2216static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2217{
2218 unsigned int __v1, __v2;
2219
2220 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2221 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2222
2223 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2224}
2225
2226static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2227{
2228 unsigned long flags;
2229
a1d8b49a 2230 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2231 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2232 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2233}
2234
2235/*
2236 * Called from interrupt context.
2237 */
2238static void transport_task_timeout_handler(unsigned long data)
2239{
2240 struct se_task *task = (struct se_task *)data;
e3d6f909 2241 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2242 unsigned long flags;
2243
2244 DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2245
a1d8b49a 2246 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2247 if (task->task_flags & TF_STOP) {
a1d8b49a 2248 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2249 return;
2250 }
2251 task->task_flags &= ~TF_RUNNING;
2252
2253 /*
2254 * Determine if transport_complete_task() has already been called.
2255 */
2256 if (!(atomic_read(&task->task_active))) {
2257 DEBUG_TT("transport task: %p cmd: %p timeout task_active"
2258 " == 0\n", task, cmd);
a1d8b49a 2259 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2260 return;
2261 }
2262
a1d8b49a
AG		 2263 atomic_inc(&cmd->t_se_count);
2264 atomic_inc(&cmd->t_transport_timeout);
2265 cmd->t_tasks_failed = 1;
c66ac9db
NB		 2266
2267 atomic_set(&task->task_timeout, 1);
2268 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2269 task->task_scsi_status = 1;
2270
2271 if (atomic_read(&task->task_stop)) {
2272 DEBUG_TT("transport task: %p cmd: %p timeout task_stop"
2273 " == 1\n", task, cmd);
a1d8b49a 2274 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2275 complete(&task->task_stop_comp);
2276 return;
2277 }
2278
a1d8b49a 2279 if (!(atomic_dec_and_test(&cmd->t_task_cdbs_left))) {
c66ac9db
NB		 2280 DEBUG_TT("transport task: %p cmd: %p timeout non zero"
2281 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2282 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2283 return;
2284 }
2285 DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2286 task, cmd);
2287
2288 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2289 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2290
2291 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2292}
2293
2294/*
a1d8b49a 2295 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2296 */
2297static void transport_start_task_timer(struct se_task *task)
2298{
2299 struct se_device *dev = task->se_dev;
2300 int timeout;
2301
2302 if (task->task_flags & TF_RUNNING)
2303 return;
2304 /*
2305 * If the task_timeout is disabled, exit now.
2306 */
e3d6f909 2307 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
c66ac9db
NB		 2308 if (!(timeout))
2309 return;
2310
2311 init_timer(&task->task_timer);
2312 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2313 task->task_timer.data = (unsigned long) task;
2314 task->task_timer.function = transport_task_timeout_handler;
2315
2316 task->task_flags |= TF_RUNNING;
2317 add_timer(&task->task_timer);
2318#if 0
2319 printk(KERN_INFO "Starting task timer for cmd: %p task: %p seconds:"
2320 " %d\n", task->task_se_cmd, task, timeout);
2321#endif
2322}
2323
2324/*
a1d8b49a 2325 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2326 */
2327void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2328{
e3d6f909 2329 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2330
2331 if (!(task->task_flags & TF_RUNNING))
2332 return;
2333
2334 task->task_flags |= TF_STOP;
a1d8b49a 2335 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2336
2337 del_timer_sync(&task->task_timer);
2338
a1d8b49a 2339 spin_lock_irqsave(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2340 task->task_flags &= ~TF_RUNNING;
2341 task->task_flags &= ~TF_STOP;
2342}
2343
2344static void transport_stop_all_task_timers(struct se_cmd *cmd)
2345{
2346 struct se_task *task = NULL, *task_tmp;
2347 unsigned long flags;
2348
a1d8b49a 2349 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2350 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2351 &cmd->t_task_list, t_list)
c66ac9db 2352 __transport_stop_task_timer(task, &flags);
a1d8b49a 2353 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2354}
2355
2356static inline int transport_tcq_window_closed(struct se_device *dev)
2357{
2358 if (dev->dev_tcq_window_closed++ <
2359 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2360 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2361 } else
2362 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2363
e3d6f909 2364 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2365 return 0;
2366}
2367
2368/*
2369 * Called from Fabric Module context from transport_execute_tasks()
2370 *
2371 * The return of this function determins if the tasks from struct se_cmd
2372 * get added to the execution queue in transport_execute_tasks(),
2373 * or are added to the delayed or ordered lists here.
2374 */
2375static inline int transport_execute_task_attr(struct se_cmd *cmd)
2376{
5951146d 2377 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2378 return 1;
2379 /*
25985edc 2380 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2381 * to allow the passed struct se_cmd list of tasks to the front of the list.
2382 */
e66ecd50 2383 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2384 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db
NB		 2385 smp_mb__after_atomic_inc();
2386 DEBUG_STA("Added HEAD_OF_QUEUE for CDB:"
2387 " 0x%02x, se_ordered_id: %u\n",
a1d8b49a 2388 cmd->_task_cdb[0],
c66ac9db
NB		 2389 cmd->se_ordered_id);
2390 return 1;
e66ecd50 2391 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2392 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2393 list_add_tail(&cmd->se_ordered_node,
2394 &cmd->se_dev->ordered_cmd_list);
2395 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2396
5951146d 2397 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2398 smp_mb__after_atomic_inc();
2399
2400 DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered"
2401 " list, se_ordered_id: %u\n",
a1d8b49a 2402 cmd->t_task_cdb[0],
c66ac9db
NB		 2403 cmd->se_ordered_id);
2404 /*
2405 * Add ORDERED command to tail of execution queue if
2406 * no other older commands exist that need to be
2407 * completed first.
2408 */
5951146d 2409 if (!(atomic_read(&cmd->se_dev->simple_cmds)))
c66ac9db
NB		 2410 return 1;
2411 } else {
2412 /*
2413 * For SIMPLE and UNTAGGED Task Attribute commands
2414 */
5951146d 2415 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2416 smp_mb__after_atomic_inc();
2417 }
2418 /*
2419 * Otherwise if one or more outstanding ORDERED task attribute exist,
2420 * add the dormant task(s) built for the passed struct se_cmd to the
2421 * execution queue and become in Active state for this struct se_device.
2422 */
5951146d 2423 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2424 /*
2425 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2426 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2427 */
5951146d 2428 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2429 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2430 list_add_tail(&cmd->se_delayed_node,
2431 &cmd->se_dev->delayed_cmd_list);
2432 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db
NB		 2433
2434 DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to"
2435 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2436 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2437 cmd->se_ordered_id);
2438 /*
2439 * Return zero to let transport_execute_tasks() know
2440 * not to add the delayed tasks to the execution list.
2441 */
2442 return 0;
2443 }
2444 /*
2445 * Otherwise, no ORDERED task attributes exist..
2446 */
2447 return 1;
2448}
2449
2450/*
2451 * Called from fabric module context in transport_generic_new_cmd() and
2452 * transport_generic_process_write()
2453 */
2454static int transport_execute_tasks(struct se_cmd *cmd)
2455{
2456 int add_tasks;
2457
db1620a2
CH		 2458 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2459 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2460 transport_generic_request_failure(cmd, NULL, 0, 1);
2461 return 0;
c66ac9db 2462 }
db1620a2 2463
c66ac9db
NB		 2464 /*
2465 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2466 * has occurred that prevents execution.
c66ac9db
NB		 2467 */
2468 if (!(transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))) {
2469 /*
2470 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2471 * attribute for the tasks of the received struct se_cmd CDB
2472 */
2473 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2474 if (!add_tasks)
c66ac9db
NB		 2475 goto execute_tasks;
2476 /*
2477 * This calls transport_add_tasks_from_cmd() to handle
2478 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2479 * (if enabled) in __transport_add_task_to_execute_queue() and
2480 * transport_add_task_check_sam_attr().
2481 */
2482 transport_add_tasks_from_cmd(cmd);
2483 }
2484 /*
2485 * Kick the execution queue for the cmd associated struct se_device
2486 * storage object.
2487 */
2488execute_tasks:
5951146d 2489 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2490 return 0;
2491}
2492
2493/*
2494 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2495 * from struct se_device->execute_task_list and
2496 *
2497 * Called from transport_processing_thread()
2498 */
2499static int __transport_execute_tasks(struct se_device *dev)
2500{
2501 int error;
2502 struct se_cmd *cmd = NULL;
e3d6f909 2503 struct se_task *task = NULL;
c66ac9db
NB		 2504 unsigned long flags;
2505
2506 /*
2507 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2508 * struct se_tasks to the selected transport.
c66ac9db
NB		 2509 */
2510check_depth:
e3d6f909 2511 if (!atomic_read(&dev->depth_left))
c66ac9db 2512 return transport_tcq_window_closed(dev);
c66ac9db 2513
e3d6f909 2514 dev->dev_tcq_window_closed = 0;
c66ac9db 2515
e3d6f909
AG		 2516 spin_lock_irq(&dev->execute_task_lock);
2517 if (list_empty(&dev->execute_task_list)) {
2518 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2519 return 0;
2520 }
e3d6f909
AG		 2521 task = list_first_entry(&dev->execute_task_list,
2522 struct se_task, t_execute_list);
2523 list_del(&task->t_execute_list);
2524 atomic_set(&task->task_execute_queue, 0);
2525 atomic_dec(&dev->execute_tasks);
2526 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2527
2528 atomic_dec(&dev->depth_left);
c66ac9db 2529
e3d6f909 2530 cmd = task->task_se_cmd;
c66ac9db 2531
a1d8b49a 2532 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2533 atomic_set(&task->task_active, 1);
2534 atomic_set(&task->task_sent, 1);
a1d8b49a 2535 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2536
a1d8b49a
AG		 2537 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2538 cmd->t_task_list_num)
c66ac9db
NB		 2539 atomic_set(&cmd->transport_sent, 1);
2540
2541 transport_start_task_timer(task);
a1d8b49a 2542 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2543 /*
2544 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2545 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2546 * struct se_subsystem_api->do_task() caller below.
2547 */
2548 if (cmd->transport_emulate_cdb) {
2549 error = cmd->transport_emulate_cdb(cmd);
2550 if (error != 0) {
2551 cmd->transport_error_status = error;
2552 atomic_set(&task->task_active, 0);
2553 atomic_set(&cmd->transport_sent, 0);
2554 transport_stop_tasks_for_cmd(cmd);
2555 transport_generic_request_failure(cmd, dev, 0, 1);
2556 goto check_depth;
2557 }
2558 /*
2559 * Handle the successful completion for transport_emulate_cdb()
2560 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2561 * Otherwise the caller is expected to complete the task with
2562 * proper status.
2563 */
2564 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2565 cmd->scsi_status = SAM_STAT_GOOD;
2566 task->task_scsi_status = GOOD;
2567 transport_complete_task(task, 1);
2568 }
2569 } else {
2570 /*
2571 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2572 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2573 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2574 * LUN emulation code.
2575 *
2576 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2577 * call ->do_task() directly and let the underlying TCM subsystem plugin
2578 * code handle the CDB emulation.
2579 */
e3d6f909
AG		 2580 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2581 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2582 error = transport_emulate_control_cdb(task);
2583 else
e3d6f909 2584 error = dev->transport->do_task(task);
c66ac9db
NB		 2585
2586 if (error != 0) {
2587 cmd->transport_error_status = error;
2588 atomic_set(&task->task_active, 0);
2589 atomic_set(&cmd->transport_sent, 0);
2590 transport_stop_tasks_for_cmd(cmd);
2591 transport_generic_request_failure(cmd, dev, 0, 1);
2592 }
2593 }
2594
2595 goto check_depth;
2596
2597 return 0;
2598}
2599
2600void transport_new_cmd_failure(struct se_cmd *se_cmd)
2601{
2602 unsigned long flags;
2603 /*
2604 * Any unsolicited data will get dumped for failed command inside of
2605 * the fabric plugin
2606 */
a1d8b49a 2607 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2608 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2609 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2610 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2611}
2612
2613static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2614
2615static inline u32 transport_get_sectors_6(
2616 unsigned char *cdb,
2617 struct se_cmd *cmd,
2618 int *ret)
2619{
5951146d 2620 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2621
2622 /*
2623 * Assume TYPE_DISK for non struct se_device objects.
2624 * Use 8-bit sector value.
2625 */
2626 if (!dev)
2627 goto type_disk;
2628
2629 /*
2630 * Use 24-bit allocation length for TYPE_TAPE.
2631 */
e3d6f909 2632 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2633 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2634
2635 /*
2636 * Everything else assume TYPE_DISK Sector CDB location.
2637 * Use 8-bit sector value.
2638 */
2639type_disk:
2640 return (u32)cdb[4];
2641}
2642
2643static inline u32 transport_get_sectors_10(
2644 unsigned char *cdb,
2645 struct se_cmd *cmd,
2646 int *ret)
2647{
5951146d 2648 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2649
2650 /*
2651 * Assume TYPE_DISK for non struct se_device objects.
2652 * Use 16-bit sector value.
2653 */
2654 if (!dev)
2655 goto type_disk;
2656
2657 /*
2658 * XXX_10 is not defined in SSC, throw an exception
2659 */
e3d6f909
AG		 2660 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2661 *ret = -EINVAL;
c66ac9db
NB		 2662 return 0;
2663 }
2664
2665 /*
2666 * Everything else assume TYPE_DISK Sector CDB location.
2667 * Use 16-bit sector value.
2668 */
2669type_disk:
2670 return (u32)(cdb[7] << 8) + cdb[8];
2671}
2672
2673static inline u32 transport_get_sectors_12(
2674 unsigned char *cdb,
2675 struct se_cmd *cmd,
2676 int *ret)
2677{
5951146d 2678 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2679
2680 /*
2681 * Assume TYPE_DISK for non struct se_device objects.
2682 * Use 32-bit sector value.
2683 */
2684 if (!dev)
2685 goto type_disk;
2686
2687 /*
2688 * XXX_12 is not defined in SSC, throw an exception
2689 */
e3d6f909
AG		 2690 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2691 *ret = -EINVAL;
c66ac9db
NB		 2692 return 0;
2693 }
2694
2695 /*
2696 * Everything else assume TYPE_DISK Sector CDB location.
2697 * Use 32-bit sector value.
2698 */
2699type_disk:
2700 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2701}
2702
2703static inline u32 transport_get_sectors_16(
2704 unsigned char *cdb,
2705 struct se_cmd *cmd,
2706 int *ret)
2707{
5951146d 2708 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2709
2710 /*
2711 * Assume TYPE_DISK for non struct se_device objects.
2712 * Use 32-bit sector value.
2713 */
2714 if (!dev)
2715 goto type_disk;
2716
2717 /*
2718 * Use 24-bit allocation length for TYPE_TAPE.
2719 */
e3d6f909 2720 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2721 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2722
2723type_disk:
2724 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2725 (cdb[12] << 8) + cdb[13];
2726}
2727
2728/*
2729 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2730 */
2731static inline u32 transport_get_sectors_32(
2732 unsigned char *cdb,
2733 struct se_cmd *cmd,
2734 int *ret)
2735{
2736 /*
2737 * Assume TYPE_DISK for non struct se_device objects.
2738 * Use 32-bit sector value.
2739 */
2740 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2741 (cdb[30] << 8) + cdb[31];
2742
2743}
2744
2745static inline u32 transport_get_size(
2746 u32 sectors,
2747 unsigned char *cdb,
2748 struct se_cmd *cmd)
2749{
5951146d 2750 struct se_device *dev = cmd->se_dev;
c66ac9db 2751
e3d6f909 2752 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2753 if (cdb[1] & 1) { /* sectors */
e3d6f909 2754 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2755 } else /* bytes */
2756 return sectors;
2757 }
2758#if 0
2759 printk(KERN_INFO "Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2760 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2761 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2762 dev->transport->name);
c66ac9db 2763#endif
e3d6f909 2764 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2765}
2766
2767unsigned char transport_asciihex_to_binaryhex(unsigned char val[2])
2768{
2769 unsigned char result = 0;
2770 /*
2771 * MSB
2772 */
2773 if ((val[0] >= 'a') && (val[0] <= 'f'))
2774 result = ((val[0] - 'a' + 10) & 0xf) << 4;
2775 else
2776 if ((val[0] >= 'A') && (val[0] <= 'F'))
2777 result = ((val[0] - 'A' + 10) & 0xf) << 4;
2778 else /* digit */
2779 result = ((val[0] - '0') & 0xf) << 4;
2780 /*
2781 * LSB
2782 */
2783 if ((val[1] >= 'a') && (val[1] <= 'f'))
2784 result |= ((val[1] - 'a' + 10) & 0xf);
2785 else
2786 if ((val[1] >= 'A') && (val[1] <= 'F'))
2787 result |= ((val[1] - 'A' + 10) & 0xf);
2788 else /* digit */
2789 result |= ((val[1] - '0') & 0xf);
2790
2791 return result;
2792}
2793EXPORT_SYMBOL(transport_asciihex_to_binaryhex);
2794
2795static void transport_xor_callback(struct se_cmd *cmd)
2796{
2797 unsigned char *buf, *addr;
2798 struct se_mem *se_mem;
2799 unsigned int offset;
2800 int i;
2801 /*
2802 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2803 *
2804 * 1) read the specified logical block(s);
2805 * 2) transfer logical blocks from the data-out buffer;
2806 * 3) XOR the logical blocks transferred from the data-out buffer with
2807 * the logical blocks read, storing the resulting XOR data in a buffer;
2808 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2809 * blocks transferred from the data-out buffer; and
2810 * 5) transfer the resulting XOR data to the data-in buffer.
2811 */
2812 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2813 if (!(buf)) {
2814 printk(KERN_ERR "Unable to allocate xor_callback buf\n");
2815 return;
2816 }
2817 /*
a1d8b49a 2818 * Copy the scatterlist WRITE buffer located at cmd->t_mem_list
c66ac9db
NB		 2819 * into the locally allocated *buf
2820 */
a1d8b49a
AG		 2821 transport_memcpy_se_mem_read_contig(buf, &cmd->t_mem_list,
2822 cmd->data_length);
c66ac9db
NB		 2823 /*
2824 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2825 * cmd->t_mem_bidi_list
c66ac9db
NB		 2826 */
2827
2828 offset = 0;
a1d8b49a 2829 list_for_each_entry(se_mem, &cmd->t_mem_bidi_list, se_list) {
c66ac9db
NB		 2830 addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0);
2831 if (!(addr))
2832 goto out;
2833
2834 for (i = 0; i < se_mem->se_len; i++)
2835 *(addr + se_mem->se_off + i) ^= *(buf + offset + i);
2836
2837 offset += se_mem->se_len;
2838 kunmap_atomic(addr, KM_USER0);
2839 }
2840out:
2841 kfree(buf);
2842}
2843
2844/*
2845 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2846 */
2847static int transport_get_sense_data(struct se_cmd *cmd)
2848{
2849 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2850 struct se_device *dev;
2851 struct se_task *task = NULL, *task_tmp;
2852 unsigned long flags;
2853 u32 offset = 0;
2854
e3d6f909
AG		 2855 WARN_ON(!cmd->se_lun);
2856
a1d8b49a 2857 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2858 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2859 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2860 return 0;
2861 }
2862
2863 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2864 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2865
2866 if (!task->task_sense)
2867 continue;
2868
2869 dev = task->se_dev;
2870 if (!(dev))
2871 continue;
2872
e3d6f909
AG		 2873 if (!dev->transport->get_sense_buffer) {
2874 printk(KERN_ERR "dev->transport->get_sense_buffer"
c66ac9db
NB		 2875 " is NULL\n");
2876 continue;
2877 }
2878
e3d6f909 2879 sense_buffer = dev->transport->get_sense_buffer(task);
c66ac9db
NB		 2880 if (!(sense_buffer)) {
2881 printk(KERN_ERR "ITT[0x%08x]_TASK[%d]: Unable to locate"
2882 " sense buffer for task with sense\n",
e3d6f909 2883 cmd->se_tfo->get_task_tag(cmd), task->task_no);
c66ac9db
NB		 2884 continue;
2885 }
a1d8b49a 2886 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2887
e3d6f909 2888 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2889 TRANSPORT_SENSE_BUFFER);
2890
5951146d 2891 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2892 TRANSPORT_SENSE_BUFFER);
2893 cmd->scsi_status = task->task_scsi_status;
2894 /* Automatically padded */
2895 cmd->scsi_sense_length =
2896 (TRANSPORT_SENSE_BUFFER + offset);
2897
2898 printk(KERN_INFO "HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2899 " and sense\n",
e3d6f909 2900 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2901 cmd->scsi_status);
2902 return 0;
2903 }
a1d8b49a 2904 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2905
2906 return -1;
2907}
2908
2909static int transport_allocate_resources(struct se_cmd *cmd)
2910{
2911 u32 length = cmd->data_length;
2912
2913 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
2914 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB))
a1d8b49a 2915 return transport_generic_get_mem(cmd, length);
c66ac9db
NB		 2916 else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB)
2917 return transport_generic_allocate_buf(cmd, length);
2918 else
2919 return 0;
2920}
2921
2922static int
2923transport_handle_reservation_conflict(struct se_cmd *cmd)
2924{
2925 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2926 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2927 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2928 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2929 /*
2930 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2931 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2932 * CONFLICT STATUS.
2933 *
2934 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2935 */
e3d6f909
AG		 2936 if (cmd->se_sess &&
2937 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2938 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2939 cmd->orig_fe_lun, 0x2C,
2940 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2941 return -EINVAL;
c66ac9db
NB		 2942}
2943
2944/* transport_generic_cmd_sequencer():
2945 *
2946 * Generic Command Sequencer that should work for most DAS transport
2947 * drivers.
2948 *
2949 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2950 * RX Thread.
2951 *
2952 * FIXME: Need to support other SCSI OPCODES where as well.
2953 */
2954static int transport_generic_cmd_sequencer(
2955 struct se_cmd *cmd,
2956 unsigned char *cdb)
2957{
5951146d 2958 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2959 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2960 int ret = 0, sector_ret = 0, passthrough;
2961 u32 sectors = 0, size = 0, pr_reg_type = 0;
2962 u16 service_action;
2963 u8 alua_ascq = 0;
2964 /*
2965 * Check for an existing UNIT ATTENTION condition
2966 */
2967 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2968 cmd->transport_wait_for_tasks =
2969 &transport_nop_wait_for_tasks;
2970 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2971 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2972 return -EINVAL;
c66ac9db
NB		 2973 }
2974 /*
2975 * Check status of Asymmetric Logical Unit Assignment port
2976 */
e3d6f909 2977 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db
NB		 2978 if (ret != 0) {
2979 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2980 /*
25985edc 2981 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2982 * The ALUA additional sense code qualifier (ASCQ) is determined
2983 * by the ALUA primary or secondary access state..
2984 */
2985 if (ret > 0) {
2986#if 0
2987 printk(KERN_INFO "[%s]: ALUA TG Port not available,"
2988 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2989 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2990#endif
2991 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2992 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2993 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2994 return -EINVAL;
c66ac9db
NB		 2995 }
2996 goto out_invalid_cdb_field;
2997 }
2998 /*
2999 * Check status for SPC-3 Persistent Reservations
3000 */
e3d6f909
AG		 3001 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
3002 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 3003 cmd, cdb, pr_reg_type) != 0)
3004 return transport_handle_reservation_conflict(cmd);
3005 /*
3006 * This means the CDB is allowed for the SCSI Initiator port
3007 * when said port is *NOT* holding the legacy SPC-2 or
3008 * SPC-3 Persistent Reservation.
3009 */
3010 }
3011
3012 switch (cdb[0]) {
3013 case READ_6:
3014 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
3015 if (sector_ret)
3016 goto out_unsupported_cdb;
3017 size = transport_get_size(sectors, cdb, cmd);
3018 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 3019 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 3020 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3021 break;
3022 case READ_10:
3023 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3024 if (sector_ret)
3025 goto out_unsupported_cdb;
3026 size = transport_get_size(sectors, cdb, cmd);
3027 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 3028 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3029 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3030 break;
3031 case READ_12:
3032 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3033 if (sector_ret)
3034 goto out_unsupported_cdb;
3035 size = transport_get_size(sectors, cdb, cmd);
3036 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a 3037 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3038 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3039 break;
3040 case READ_16:
3041 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3042 if (sector_ret)
3043 goto out_unsupported_cdb;
3044 size = transport_get_size(sectors, cdb, cmd);
3045 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a 3046 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3047 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3048 break;
3049 case WRITE_6:
3050 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
3051 if (sector_ret)
3052 goto out_unsupported_cdb;
3053 size = transport_get_size(sectors, cdb, cmd);
3054 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 3055 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 3056 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3057 break;
3058 case WRITE_10:
3059 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3060 if (sector_ret)
3061 goto out_unsupported_cdb;
3062 size = transport_get_size(sectors, cdb, cmd);
3063 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a
AG		 3064 cmd->t_task_lba = transport_lba_32(cdb);
3065 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3066 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3067 break;
3068 case WRITE_12:
3069 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3070 if (sector_ret)
3071 goto out_unsupported_cdb;
3072 size = transport_get_size(sectors, cdb, cmd);
3073 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a
AG		 3074 cmd->t_task_lba = transport_lba_32(cdb);
3075 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3076 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3077 break;
3078 case WRITE_16:
3079 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3080 if (sector_ret)
3081 goto out_unsupported_cdb;
3082 size = transport_get_size(sectors, cdb, cmd);
3083 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a
AG		 3084 cmd->t_task_lba = transport_lba_64(cdb);
3085 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3086 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3087 break;
3088 case XDWRITEREAD_10:
3089 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 3090 !(cmd->t_tasks_bidi))
c66ac9db
NB		 3091 goto out_invalid_cdb_field;
3092 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3093 if (sector_ret)
3094 goto out_unsupported_cdb;
3095 size = transport_get_size(sectors, cdb, cmd);
3096 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 3097 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 3098 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 3099 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3100 TRANSPORT_PLUGIN_PHBA_PDEV);
3101 /*
3102 * Skip the remaining assignments for TCM/PSCSI passthrough
3103 */
3104 if (passthrough)
3105 break;
3106 /*
3107 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3108 */
3109 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3110 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3111 break;
3112 case VARIABLE_LENGTH_CMD:
3113 service_action = get_unaligned_be16(&cdb[8]);
3114 /*
3115 * Determine if this is TCM/PSCSI device and we should disable
3116 * internal emulation for this CDB.
3117 */
e3d6f909 3118 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3119 TRANSPORT_PLUGIN_PHBA_PDEV);
3120
3121 switch (service_action) {
3122 case XDWRITEREAD_32:
3123 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3124 if (sector_ret)
3125 goto out_unsupported_cdb;
3126 size = transport_get_size(sectors, cdb, cmd);
3127 /*
3128 * Use WRITE_32 and READ_32 opcodes for the emulated
3129 * XDWRITE_READ_32 logic.
3130 */
3131 cmd->transport_split_cdb = &split_cdb_XX_32;
a1d8b49a 3132 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 3133 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3134
3135 /*
3136 * Skip the remaining assignments for TCM/PSCSI passthrough
3137 */
3138 if (passthrough)
3139 break;
3140
3141 /*
3142 * Setup BIDI XOR callback to be run during
3143 * transport_generic_complete_ok()
3144 */
3145 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3146 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 3147 break;
3148 case WRITE_SAME_32:
3149 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3150 if (sector_ret)
3151 goto out_unsupported_cdb;
dd3a5ad8
NB		 3152
3153 if (sectors != 0)
3154 size = transport_get_size(sectors, cdb, cmd);
3155 else
3156 size = dev->se_sub_dev->se_dev_attrib.block_size;
3157
a1d8b49a 3158 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 3159 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3160
3161 /*
3162 * Skip the remaining assignments for TCM/PSCSI passthrough
3163 */
3164 if (passthrough)
3165 break;
3166
3167 if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
3168 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3169 " bits not supported for Block Discard"
3170 " Emulation\n");
3171 goto out_invalid_cdb_field;
3172 }
3173 /*
3174 * Currently for the emulated case we only accept
3175 * tpws with the UNMAP=1 bit set.
3176 */
3177 if (!(cdb[10] & 0x08)) {
3178 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not"
3179 " supported for Block Discard Emulation\n");
3180 goto out_invalid_cdb_field;
3181 }
3182 break;
3183 default:
3184 printk(KERN_ERR "VARIABLE_LENGTH_CMD service action"
3185 " 0x%04x not supported\n", service_action);
3186 goto out_unsupported_cdb;
3187 }
3188 break;
e434f1f1 3189 case MAINTENANCE_IN:
e3d6f909 3190 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3191 /* MAINTENANCE_IN from SCC-2 */
3192 /*
3193 * Check for emulated MI_REPORT_TARGET_PGS.
3194 */
3195 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3196 cmd->transport_emulate_cdb =
e3d6f909 3197 (su_dev->t10_alua.alua_type ==
c66ac9db 3198 SPC3_ALUA_EMULATED) ?
e3d6f909 3199 core_emulate_report_target_port_groups :
c66ac9db
NB		 3200 NULL;
3201 }
3202 size = (cdb[6] << 24) | (cdb[7] << 16) |
3203 (cdb[8] << 8) | cdb[9];
3204 } else {
3205 /* GPCMD_SEND_KEY from multi media commands */
3206 size = (cdb[8] << 8) + cdb[9];
3207 }
3208 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3209 break;
3210 case MODE_SELECT:
3211 size = cdb[4];
3212 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3213 break;
3214 case MODE_SELECT_10:
3215 size = (cdb[7] << 8) + cdb[8];
3216 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3217 break;
3218 case MODE_SENSE:
3219 size = cdb[4];
3220 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3221 break;
3222 case MODE_SENSE_10:
3223 case GPCMD_READ_BUFFER_CAPACITY:
3224 case GPCMD_SEND_OPC:
3225 case LOG_SELECT:
3226 case LOG_SENSE:
3227 size = (cdb[7] << 8) + cdb[8];
3228 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3229 break;
3230 case READ_BLOCK_LIMITS:
3231 size = READ_BLOCK_LEN;
3232 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3233 break;
3234 case GPCMD_GET_CONFIGURATION:
3235 case GPCMD_READ_FORMAT_CAPACITIES:
3236 case GPCMD_READ_DISC_INFO:
3237 case GPCMD_READ_TRACK_RZONE_INFO:
3238 size = (cdb[7] << 8) + cdb[8];
3239 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3240 break;
3241 case PERSISTENT_RESERVE_IN:
3242 case PERSISTENT_RESERVE_OUT:
3243 cmd->transport_emulate_cdb =
e3d6f909 3244 (su_dev->t10_pr.res_type ==
c66ac9db 3245 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3246 core_scsi3_emulate_pr : NULL;
c66ac9db
NB		 3247 size = (cdb[7] << 8) + cdb[8];
3248 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3249 break;
3250 case GPCMD_MECHANISM_STATUS:
3251 case GPCMD_READ_DVD_STRUCTURE:
3252 size = (cdb[8] << 8) + cdb[9];
3253 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3254 break;
3255 case READ_POSITION:
3256 size = READ_POSITION_LEN;
3257 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3258 break;
e434f1f1 3259 case MAINTENANCE_OUT:
e3d6f909 3260 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3261 /* MAINTENANCE_OUT from SCC-2
3262 *
3263 * Check for emulated MO_SET_TARGET_PGS.
3264 */
3265 if (cdb[1] == MO_SET_TARGET_PGS) {
3266 cmd->transport_emulate_cdb =
e3d6f909 3267 (su_dev->t10_alua.alua_type ==
c66ac9db 3268 SPC3_ALUA_EMULATED) ?
e3d6f909 3269 core_emulate_set_target_port_groups :
c66ac9db
NB		 3270 NULL;
3271 }
3272
3273 size = (cdb[6] << 24) | (cdb[7] << 16) |
3274 (cdb[8] << 8) | cdb[9];
3275 } else {
3276 /* GPCMD_REPORT_KEY from multi media commands */
3277 size = (cdb[8] << 8) + cdb[9];
3278 }
3279 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3280 break;
3281 case INQUIRY:
3282 size = (cdb[3] << 8) + cdb[4];
3283 /*
3284 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3285 * See spc4r17 section 5.3
3286 */
5951146d 3287 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3288 cmd->sam_task_attr = MSG_HEAD_TAG;
c66ac9db
NB		 3289 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3290 break;
3291 case READ_BUFFER:
3292 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3293 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3294 break;
3295 case READ_CAPACITY:
3296 size = READ_CAP_LEN;
3297 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3298 break;
3299 case READ_MEDIA_SERIAL_NUMBER:
3300 case SECURITY_PROTOCOL_IN:
3301 case SECURITY_PROTOCOL_OUT:
3302 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3303 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3304 break;
3305 case SERVICE_ACTION_IN:
3306 case ACCESS_CONTROL_IN:
3307 case ACCESS_CONTROL_OUT:
3308 case EXTENDED_COPY:
3309 case READ_ATTRIBUTE:
3310 case RECEIVE_COPY_RESULTS:
3311 case WRITE_ATTRIBUTE:
3312 size = (cdb[10] << 24) | (cdb[11] << 16) |
3313 (cdb[12] << 8) | cdb[13];
3314 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3315 break;
3316 case RECEIVE_DIAGNOSTIC:
3317 case SEND_DIAGNOSTIC:
3318 size = (cdb[3] << 8) | cdb[4];
3319 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3320 break;
3321/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3322#if 0
3323 case GPCMD_READ_CD:
3324 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3325 size = (2336 * sectors);
3326 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3327 break;
3328#endif
3329 case READ_TOC:
3330 size = cdb[8];
3331 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3332 break;
3333 case REQUEST_SENSE:
3334 size = cdb[4];
3335 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3336 break;
3337 case READ_ELEMENT_STATUS:
3338 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3339 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3340 break;
3341 case WRITE_BUFFER:
3342 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3343 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3344 break;
3345 case RESERVE:
3346 case RESERVE_10:
3347 /*
3348 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3349 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3350 */
3351 if (cdb[0] == RESERVE_10)
3352 size = (cdb[7] << 8) | cdb[8];
3353 else
3354 size = cmd->data_length;
3355
3356 /*
3357 * Setup the legacy emulated handler for SPC-2 and
3358 * >= SPC-3 compatible reservation handling (CRH=1)
3359 * Otherwise, we assume the underlying SCSI logic is
3360 * is running in SPC_PASSTHROUGH, and wants reservations
3361 * emulation disabled.
3362 */
3363 cmd->transport_emulate_cdb =
e3d6f909 3364 (su_dev->t10_pr.res_type !=
c66ac9db 3365 SPC_PASSTHROUGH) ?
e3d6f909 3366 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3367 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3368 break;
3369 case RELEASE:
3370 case RELEASE_10:
3371 /*
3372 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3373 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3374 */
3375 if (cdb[0] == RELEASE_10)
3376 size = (cdb[7] << 8) | cdb[8];
3377 else
3378 size = cmd->data_length;
3379
3380 cmd->transport_emulate_cdb =
e3d6f909 3381 (su_dev->t10_pr.res_type !=
c66ac9db 3382 SPC_PASSTHROUGH) ?
e3d6f909 3383 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3384 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3385 break;
3386 case SYNCHRONIZE_CACHE:
3387 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3388 /*
3389 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3390 */
3391 if (cdb[0] == SYNCHRONIZE_CACHE) {
3392 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3393 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3394 } else {
3395 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3396 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3397 }
3398 if (sector_ret)
3399 goto out_unsupported_cdb;
3400
3401 size = transport_get_size(sectors, cdb, cmd);
3402 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3403
3404 /*
3405 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3406 */
e3d6f909 3407 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3408 break;
3409 /*
3410 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3411 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3412 */
3413 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3414 /*
3415 * Check to ensure that LBA + Range does not exceed past end of
3416 * device.
3417 */
a1d8b49a 3418 if (!transport_cmd_get_valid_sectors(cmd))
c66ac9db
NB		 3419 goto out_invalid_cdb_field;
3420 break;
3421 case UNMAP:
3422 size = get_unaligned_be16(&cdb[7]);
c66ac9db
NB		 3423 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3424 break;
3425 case WRITE_SAME_16:
3426 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3427 if (sector_ret)
3428 goto out_unsupported_cdb;
dd3a5ad8
NB		 3429
3430 if (sectors != 0)
3431 size = transport_get_size(sectors, cdb, cmd);
3432 else
3433 size = dev->se_sub_dev->se_dev_attrib.block_size;
3434
a1d8b49a 3435 cmd->t_task_lba = get_unaligned_be16(&cdb[2]);
e3d6f909 3436 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3437 TRANSPORT_PLUGIN_PHBA_PDEV);
3438 /*
3439 * Determine if the received WRITE_SAME_16 is used to for direct
3440 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3441 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3442 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3443 * TCM/FILEIO subsystem plugin backstores.
3444 */
3445 if (!(passthrough)) {
3446 if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
3447 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3448 " bits not supported for Block Discard"
3449 " Emulation\n");
3450 goto out_invalid_cdb_field;
3451 }
3452 /*
3453 * Currently for the emulated case we only accept
3454 * tpws with the UNMAP=1 bit set.
3455 */
3456 if (!(cdb[1] & 0x08)) {
3457 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not "
3458 " supported for Block Discard Emulation\n");
3459 goto out_invalid_cdb_field;
3460 }
3461 }
3462 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3463 break;
3464 case ALLOW_MEDIUM_REMOVAL:
3465 case GPCMD_CLOSE_TRACK:
3466 case ERASE:
3467 case INITIALIZE_ELEMENT_STATUS:
3468 case GPCMD_LOAD_UNLOAD:
3469 case REZERO_UNIT:
3470 case SEEK_10:
3471 case GPCMD_SET_SPEED:
3472 case SPACE:
3473 case START_STOP:
3474 case TEST_UNIT_READY:
3475 case VERIFY:
3476 case WRITE_FILEMARKS:
3477 case MOVE_MEDIUM:
3478 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3479 break;
3480 case REPORT_LUNS:
3481 cmd->transport_emulate_cdb =
e3d6f909 3482 transport_core_report_lun_response;
c66ac9db
NB		 3483 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3484 /*
3485 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3486 * See spc4r17 section 5.3
3487 */
5951146d 3488 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3489 cmd->sam_task_attr = MSG_HEAD_TAG;
c66ac9db
NB		 3490 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3491 break;
3492 default:
3493 printk(KERN_WARNING "TARGET_CORE[%s]: Unsupported SCSI Opcode"
3494 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3495 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3496 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3497 goto out_unsupported_cdb;
3498 }
3499
3500 if (size != cmd->data_length) {
3501 printk(KERN_WARNING "TARGET_CORE[%s]: Expected Transfer Length:"
3502 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3503 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3504 cmd->data_length, size, cdb[0]);
3505
3506 cmd->cmd_spdtl = size;
3507
3508 if (cmd->data_direction == DMA_TO_DEVICE) {
3509 printk(KERN_ERR "Rejecting underflow/overflow"
3510 " WRITE data\n");
3511 goto out_invalid_cdb_field;
3512 }
3513 /*
3514 * Reject READ_* or WRITE_* with overflow/underflow for
3515 * type SCF_SCSI_DATA_SG_IO_CDB.
3516 */
e3d6f909 3517 if (!(ret) && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
c66ac9db
NB		 3518 printk(KERN_ERR "Failing OVERFLOW/UNDERFLOW for LBA op"
3519 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3520 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3521 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3522 goto out_invalid_cdb_field;
3523 }
3524
3525 if (size > cmd->data_length) {
3526 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3527 cmd->residual_count = (size - cmd->data_length);
3528 } else {
3529 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3530 cmd->residual_count = (cmd->data_length - size);
3531 }
3532 cmd->data_length = size;
3533 }
3534
3535 transport_set_supported_SAM_opcode(cmd);
3536 return ret;
3537
3538out_unsupported_cdb:
3539 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3540 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3541 return -EINVAL;
c66ac9db
NB		 3542out_invalid_cdb_field:
3543 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3544 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3545 return -EINVAL;
c66ac9db
NB		 3546}
3547
3548static inline void transport_release_tasks(struct se_cmd *);
3549
c66ac9db 3550static void transport_memcpy_se_mem_read_contig(
c66ac9db 3551 unsigned char *dst,
a1d8b49a
AG		 3552 struct list_head *se_mem_list,
3553 u32 tot_len)
c66ac9db
NB		 3554{
3555 struct se_mem *se_mem;
3556 void *src;
a1d8b49a 3557 u32 length;
c66ac9db
NB		 3558
3559 list_for_each_entry(se_mem, se_mem_list, se_list) {
a1d8b49a 3560 length = min_t(u32, se_mem->se_len, tot_len);
c66ac9db 3561 src = page_address(se_mem->se_page) + se_mem->se_off;
c66ac9db 3562 memcpy(dst, src, length);
a1d8b49a
AG		 3563 tot_len -= length;
3564 if (!tot_len)
3565 break;
c66ac9db
NB		 3566 dst += length;
3567 }
3568}
3569
3570/*
3571 * Called from transport_generic_complete_ok() and
3572 * transport_generic_request_failure() to determine which dormant/delayed
3573 * and ordered cmds need to have their tasks added to the execution queue.
3574 */
3575static void transport_complete_task_attr(struct se_cmd *cmd)
3576{
5951146d 3577 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3578 struct se_cmd *cmd_p, *cmd_tmp;
3579 int new_active_tasks = 0;
3580
e66ecd50 3581 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3582 atomic_dec(&dev->simple_cmds);
3583 smp_mb__after_atomic_dec();
3584 dev->dev_cur_ordered_id++;
3585 DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for"
3586 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3587 cmd->se_ordered_id);
e66ecd50 3588 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3589 atomic_dec(&dev->dev_hoq_count);
3590 smp_mb__after_atomic_dec();
3591 dev->dev_cur_ordered_id++;
3592 DEBUG_STA("Incremented dev_cur_ordered_id: %u for"
3593 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3594 cmd->se_ordered_id);
e66ecd50 3595 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3596 spin_lock(&dev->ordered_cmd_lock);
5951146d 3597 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3598 atomic_dec(&dev->dev_ordered_sync);
3599 smp_mb__after_atomic_dec();
3600 spin_unlock(&dev->ordered_cmd_lock);
3601
3602 dev->dev_cur_ordered_id++;
3603 DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:"
3604 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3605 }
3606 /*
3607 * Process all commands up to the last received
3608 * ORDERED task attribute which requires another blocking
3609 * boundary
3610 */
3611 spin_lock(&dev->delayed_cmd_lock);
3612 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3613 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3614
5951146d 3615 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3616 spin_unlock(&dev->delayed_cmd_lock);
3617
3618 DEBUG_STA("Calling add_tasks() for"
3619 " cmd_p: 0x%02x Task Attr: 0x%02x"
3620 " Dormant -> Active, se_ordered_id: %u\n",
3621 T_TASK(cmd_p)->t_task_cdb[0],
3622 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3623
3624 transport_add_tasks_from_cmd(cmd_p);
3625 new_active_tasks++;
3626
3627 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3628 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3629 break;
3630 }
3631 spin_unlock(&dev->delayed_cmd_lock);
3632 /*
3633 * If new tasks have become active, wake up the transport thread
3634 * to do the processing of the Active tasks.
3635 */
3636 if (new_active_tasks != 0)
e3d6f909 3637 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3638}
3639
3640static void transport_generic_complete_ok(struct se_cmd *cmd)
3641{
3642 int reason = 0;
3643 /*
3644 * Check if we need to move delayed/dormant tasks from cmds on the
3645 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3646 * Attribute.
3647 */
5951146d 3648 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 3649 transport_complete_task_attr(cmd);
3650 /*
3651 * Check if we need to retrieve a sense buffer from
3652 * the struct se_cmd in question.
3653 */
3654 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3655 if (transport_get_sense_data(cmd) < 0)
3656 reason = TCM_NON_EXISTENT_LUN;
3657
3658 /*
3659 * Only set when an struct se_task->task_scsi_status returned
3660 * a non GOOD status.
3661 */
3662 if (cmd->scsi_status) {
3663 transport_send_check_condition_and_sense(
3664 cmd, reason, 1);
3665 transport_lun_remove_cmd(cmd);
3666 transport_cmd_check_stop_to_fabric(cmd);
3667 return;
3668 }
3669 }
3670 /*
25985edc 3671 * Check for a callback, used by amongst other things
c66ac9db
NB		 3672 * XDWRITE_READ_10 emulation.
3673 */
3674 if (cmd->transport_complete_callback)
3675 cmd->transport_complete_callback(cmd);
3676
3677 switch (cmd->data_direction) {
3678 case DMA_FROM_DEVICE:
3679 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3680 if (cmd->se_lun->lun_sep) {
3681 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3682 cmd->data_length;
3683 }
3684 spin_unlock(&cmd->se_lun->lun_sep_lock);
3685 /*
a1d8b49a 3686 * If enabled by TCM fabric module pre-registered SGL
c66ac9db 3687 * memory, perform the memcpy() from the TCM internal
a1d8b49a 3688 * contiguous buffer back to the original SGL.
c66ac9db
NB		 3689 */
3690 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
a1d8b49a
AG		 3691 sg_copy_from_buffer(cmd->t_task_pt_sgl,
3692 cmd->t_task_pt_sgl_num,
3693 cmd->t_task_buf,
3694 cmd->data_length);
c66ac9db 3695
e3d6f909 3696 cmd->se_tfo->queue_data_in(cmd);
c66ac9db
NB		 3697 break;
3698 case DMA_TO_DEVICE:
3699 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3700 if (cmd->se_lun->lun_sep) {
3701 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3702 cmd->data_length;
3703 }
3704 spin_unlock(&cmd->se_lun->lun_sep_lock);
3705 /*
3706 * Check if we need to send READ payload for BIDI-COMMAND
3707 */
a1d8b49a 3708 if (!list_empty(&cmd->t_mem_bidi_list)) {
c66ac9db 3709 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3710 if (cmd->se_lun->lun_sep) {
3711 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3712 cmd->data_length;
3713 }
3714 spin_unlock(&cmd->se_lun->lun_sep_lock);
e3d6f909 3715 cmd->se_tfo->queue_data_in(cmd);
c66ac9db
NB		 3716 break;
3717 }
3718 /* Fall through for DMA_TO_DEVICE */
3719 case DMA_NONE:
e3d6f909 3720 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3721 break;
3722 default:
3723 break;
3724 }
3725
3726 transport_lun_remove_cmd(cmd);
3727 transport_cmd_check_stop_to_fabric(cmd);
3728}
3729
3730static void transport_free_dev_tasks(struct se_cmd *cmd)
3731{
3732 struct se_task *task, *task_tmp;
3733 unsigned long flags;
3734
a1d8b49a 3735 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3736 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3737 &cmd->t_task_list, t_list) {
c66ac9db
NB		 3738 if (atomic_read(&task->task_active))
3739 continue;
3740
3741 kfree(task->task_sg_bidi);
3742 kfree(task->task_sg);
3743
3744 list_del(&task->t_list);
3745
a1d8b49a 3746 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3747 if (task->se_dev)
e3d6f909 3748 task->se_dev->transport->free_task(task);
c66ac9db
NB		 3749 else
3750 printk(KERN_ERR "task[%u] - task->se_dev is NULL\n",
3751 task->task_no);
a1d8b49a 3752 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3753 }
a1d8b49a 3754 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3755}
3756
3757static inline void transport_free_pages(struct se_cmd *cmd)
3758{
3759 struct se_mem *se_mem, *se_mem_tmp;
3760 int free_page = 1;
3761
3762 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3763 free_page = 0;
3764 if (cmd->se_dev->transport->do_se_mem_map)
3765 free_page = 0;
3766
a1d8b49a
AG		 3767 if (cmd->t_task_buf) {
3768 kfree(cmd->t_task_buf);
3769 cmd->t_task_buf = NULL;
c66ac9db
NB		 3770 return;
3771 }
3772
c66ac9db 3773 list_for_each_entry_safe(se_mem, se_mem_tmp,
a1d8b49a 3774 &cmd->t_mem_list, se_list) {
c66ac9db
NB		 3775 /*
3776 * We only release call __free_page(struct se_mem->se_page) when
3777 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3778 */
3779 if (free_page)
3780 __free_page(se_mem->se_page);
3781
3782 list_del(&se_mem->se_list);
3783 kmem_cache_free(se_mem_cache, se_mem);
3784 }
a1d8b49a 3785 cmd->t_tasks_se_num = 0;
c66ac9db 3786
5951146d 3787 list_for_each_entry_safe(se_mem, se_mem_tmp,
a1d8b49a 3788 &cmd->t_mem_bidi_list, se_list) {
5951146d
AG		 3789 /*
3790 * We only release call __free_page(struct se_mem->se_page) when
3791 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3792 */
3793 if (free_page)
3794 __free_page(se_mem->se_page);
c66ac9db 3795
5951146d
AG		 3796 list_del(&se_mem->se_list);
3797 kmem_cache_free(se_mem_cache, se_mem);
c66ac9db 3798 }
a1d8b49a 3799 cmd->t_tasks_se_bidi_num = 0;
c66ac9db
NB		 3800}
3801
3802static inline void transport_release_tasks(struct se_cmd *cmd)
3803{
3804 transport_free_dev_tasks(cmd);
3805}
3806
3807static inline int transport_dec_and_check(struct se_cmd *cmd)
3808{
3809 unsigned long flags;
3810
a1d8b49a
AG		 3811 spin_lock_irqsave(&cmd->t_state_lock, flags);
3812 if (atomic_read(&cmd->t_fe_count)) {
3813 if (!(atomic_dec_and_test(&cmd->t_fe_count))) {
3814 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3815 flags);
3816 return 1;
3817 }
3818 }
3819
a1d8b49a
AG		 3820 if (atomic_read(&cmd->t_se_count)) {
3821 if (!(atomic_dec_and_test(&cmd->t_se_count))) {
3822 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3823 flags);
3824 return 1;
3825 }
3826 }
a1d8b49a 3827 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3828
3829 return 0;
3830}
3831
3832static void transport_release_fe_cmd(struct se_cmd *cmd)
3833{
3834 unsigned long flags;
3835
3836 if (transport_dec_and_check(cmd))
3837 return;
3838
a1d8b49a
AG		 3839 spin_lock_irqsave(&cmd->t_state_lock, flags);
3840 if (!(atomic_read(&cmd->transport_dev_active))) {
3841 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3842 goto free_pages;
3843 }
a1d8b49a 3844 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3845 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3846 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3847
3848 transport_release_tasks(cmd);
3849free_pages:
3850 transport_free_pages(cmd);
3851 transport_free_se_cmd(cmd);
35462975 3852 cmd->se_tfo->release_cmd(cmd);
c66ac9db
NB		 3853}
3854
35462975
CH		 3855static int
3856transport_generic_remove(struct se_cmd *cmd, int session_reinstatement)
c66ac9db
NB		 3857{
3858 unsigned long flags;
3859
c66ac9db
NB		 3860 if (transport_dec_and_check(cmd)) {
3861 if (session_reinstatement) {
a1d8b49a 3862 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3863 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3864 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3865 flags);
3866 }
3867 return 1;
3868 }
3869
a1d8b49a
AG		 3870 spin_lock_irqsave(&cmd->t_state_lock, flags);
3871 if (!(atomic_read(&cmd->transport_dev_active))) {
3872 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3873 goto free_pages;
3874 }
a1d8b49a 3875 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3876 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3877 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3878
3879 transport_release_tasks(cmd);
5951146d 3880
c66ac9db
NB		 3881free_pages:
3882 transport_free_pages(cmd);
35462975 3883 transport_release_cmd(cmd);
c66ac9db
NB		 3884 return 0;
3885}
3886
3887/*
3888 * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map
3889 * @cmd: Associated se_cmd descriptor
3890 * @mem: SGL style memory for TCM WRITE / READ
3891 * @sg_mem_num: Number of SGL elements
3892 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3893 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3894 *
3895 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3896 * of parameters.
3897 */
3898int transport_generic_map_mem_to_cmd(
3899 struct se_cmd *cmd,
5951146d
AG		 3900 struct scatterlist *sgl,
3901 u32 sgl_count,
3902 struct scatterlist *sgl_bidi,
3903 u32 sgl_bidi_count)
c66ac9db 3904{
c66ac9db
NB		 3905 int ret;
3906
5951146d 3907 if (!sgl || !sgl_count)
c66ac9db 3908 return 0;
c66ac9db 3909
c66ac9db 3910 /*
5951146d 3911 * Convert sgls (sgl, sgl_bidi) to list of se_mems
c66ac9db
NB		 3912 */
3913 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3914 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3915 /*
3916 * For CDB using TCM struct se_mem linked list scatterlist memory
3917 * processed into a TCM struct se_subsystem_dev, we do the mapping
3918 * from the passed physical memory to struct se_mem->se_page here.
3919 */
a1d8b49a 3920 ret = transport_map_sg_to_mem(cmd, &cmd->t_mem_list, sgl);
c66ac9db
NB		 3921 if (ret < 0)
3922 return -ENOMEM;
3923
a1d8b49a 3924 cmd->t_tasks_se_num = ret;
c66ac9db
NB		 3925 /*
3926 * Setup BIDI READ list of struct se_mem elements
3927 */
5951146d 3928 if (sgl_bidi && sgl_bidi_count) {
a1d8b49a 3929 ret = transport_map_sg_to_mem(cmd, &cmd->t_mem_bidi_list, sgl_bidi);
5951146d 3930 if (ret < 0)
c66ac9db 3931 return -ENOMEM;
c66ac9db 3932
a1d8b49a 3933 cmd->t_tasks_se_bidi_num = ret;
c66ac9db
NB		 3934 }
3935 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3936
3937 } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
5951146d 3938 if (sgl_bidi || sgl_bidi_count) {
c66ac9db
NB		 3939 printk(KERN_ERR "BIDI-Commands not supported using "
3940 "SCF_SCSI_CONTROL_NONSG_IO_CDB\n");
3941 return -ENOSYS;
3942 }
3943 /*
a1d8b49a 3944 * For incoming CDBs using a contiguous buffer internal with TCM,
c66ac9db
NB		 3945 * save the passed struct scatterlist memory. After TCM storage object
3946 * processing has completed for this struct se_cmd, TCM core will call
3947 * transport_memcpy_[write,read]_contig() as necessary from
3948 * transport_generic_complete_ok() and transport_write_pending() in order
3949 * to copy the TCM buffer to/from the original passed *mem in SGL ->
3950 * struct scatterlist format.
3951 */
3952 cmd->se_cmd_flags |= SCF_PASSTHROUGH_CONTIG_TO_SG;
a1d8b49a
AG		 3953 cmd->t_task_pt_sgl = sgl;
3954 cmd->t_task_pt_sgl_num = sgl_count;
c66ac9db
NB		 3955 }
3956
3957 return 0;
3958}
3959EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3960
3961
3962static inline long long transport_dev_end_lba(struct se_device *dev)
3963{
3964 return dev->transport->get_blocks(dev) + 1;
3965}
3966
a1d8b49a 3967static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
c66ac9db 3968{
5951146d 3969 struct se_device *dev = cmd->se_dev;
a1d8b49a 3970 u32 sectors;
c66ac9db 3971
e3d6f909 3972 if (dev->transport->get_device_type(dev) != TYPE_DISK)
c66ac9db
NB		 3973 return 0;
3974
a1d8b49a
AG		 3975 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
3976
3977 if ((cmd->t_task_lba + sectors) >
c66ac9db
NB		 3978 transport_dev_end_lba(dev)) {
3979 printk(KERN_ERR "LBA: %llu Sectors: %u exceeds"
3980 " transport_dev_end_lba(): %llu\n",
a1d8b49a 3981 cmd->t_task_lba, sectors,
c66ac9db 3982 transport_dev_end_lba(dev));
a1d8b49a 3983 return 0;
c66ac9db
NB		 3984 }
3985
a1d8b49a 3986 return sectors;
c66ac9db
NB		 3987}
3988
3989static int transport_new_cmd_obj(struct se_cmd *cmd)
3990{
5951146d 3991 struct se_device *dev = cmd->se_dev;
a1d8b49a
AG		 3992 u32 task_cdbs;
3993 u32 rc;
c66ac9db
NB		 3994
3995 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
a1d8b49a
AG		 3996 task_cdbs = 1;
3997 cmd->t_task_list_num = 1;
c66ac9db
NB		 3998 } else {
3999 int set_counts = 1;
4000
4001 /*
4002 * Setup any BIDI READ tasks and memory from
a1d8b49a 4003 * cmd->t_mem_bidi_list so the READ struct se_tasks
c66ac9db
NB		 4004 * are queued first for the non pSCSI passthrough case.
4005 */
a1d8b49a 4006 if (!list_empty(&cmd->t_mem_bidi_list) &&
e3d6f909 4007 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
a1d8b49a
AG		 4008 rc = transport_allocate_tasks(cmd,
4009 cmd->t_task_lba,
4010 transport_cmd_get_valid_sectors(cmd),
4011 DMA_FROM_DEVICE, &cmd->t_mem_bidi_list,
c66ac9db
NB		 4012 set_counts);
4013 if (!(rc)) {
4014 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4015 cmd->scsi_sense_reason =
4016 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4017 return PYX_TRANSPORT_LU_COMM_FAILURE;
4018 }
4019 set_counts = 0;
4020 }
4021 /*
a1d8b49a 4022 * Setup the tasks and memory from cmd->t_mem_list
c66ac9db
NB		 4023 * Note for BIDI transfers this will contain the WRITE payload
4024 */
a1d8b49a
AG		 4025 task_cdbs = transport_allocate_tasks(cmd,
4026 cmd->t_task_lba,
4027 transport_cmd_get_valid_sectors(cmd),
4028 cmd->data_direction, &cmd->t_mem_list,
c66ac9db
NB		 4029 set_counts);
4030 if (!(task_cdbs)) {
4031 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4032 cmd->scsi_sense_reason =
4033 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4034 return PYX_TRANSPORT_LU_COMM_FAILURE;
4035 }
a1d8b49a 4036 cmd->t_task_list_num = task_cdbs;
c66ac9db
NB		 4037
4038#if 0
4039 printk(KERN_INFO "data_length: %u, LBA: %llu t_tasks_sectors:"
4040 " %u, t_task_cdbs: %u\n", obj_ptr, cmd->data_length,
a1d8b49a
AG		 4041 cmd->t_task_lba, cmd->t_tasks_sectors,
4042 cmd->t_task_cdbs);
c66ac9db
NB		 4043#endif
4044 }
4045
a1d8b49a
AG		 4046 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
4047 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
4048 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 4049 return 0;
4050}
4051
c66ac9db 4052static int
a1d8b49a 4053transport_generic_get_mem(struct se_cmd *cmd, u32 length)
c66ac9db 4054{
c66ac9db
NB		 4055 struct se_mem *se_mem;
4056
c66ac9db
NB		 4057 /*
4058 * If the device uses memory mapping this is enough.
4059 */
4060 if (cmd->se_dev->transport->do_se_mem_map)
4061 return 0;
4062
c66ac9db
NB		 4063 while (length) {
4064 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4065 if (!(se_mem)) {
4066 printk(KERN_ERR "Unable to allocate struct se_mem\n");
4067 goto out;
4068 }
c66ac9db
NB		 4069
4070/* #warning FIXME Allocate contigous pages for struct se_mem elements */
a1d8b49a 4071 se_mem->se_page = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0);
c66ac9db
NB		 4072 if (!(se_mem->se_page)) {
4073 printk(KERN_ERR "alloc_pages() failed\n");
4074 goto out;
4075 }
4076
87210568 4077 INIT_LIST_HEAD(&se_mem->se_list);
a1d8b49a
AG		 4078 se_mem->se_len = min_t(u32, length, PAGE_SIZE);
4079 list_add_tail(&se_mem->se_list, &cmd->t_mem_list);
4080 cmd->t_tasks_se_num++;
c66ac9db
NB		 4081
4082 DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)"
4083 " Offset(%u)\n", se_mem->se_page, se_mem->se_len,
4084 se_mem->se_off);
4085
4086 length -= se_mem->se_len;
4087 }
4088
4089 DEBUG_MEM("Allocated total struct se_mem elements(%u)\n",
a1d8b49a 4090 cmd->t_tasks_se_num);
c66ac9db
NB		 4091
4092 return 0;
4093out:
87210568
JJ		 4094 if (se_mem)
4095 __free_pages(se_mem->se_page, 0);
4096 kmem_cache_free(se_mem_cache, se_mem);
e3d6f909 4097 return -ENOMEM;
c66ac9db
NB		 4098}
4099
e3d6f909 4100int transport_init_task_sg(
c66ac9db
NB		 4101 struct se_task *task,
4102 struct se_mem *in_se_mem,
4103 u32 task_offset)
4104{
4105 struct se_cmd *se_cmd = task->task_se_cmd;
5951146d 4106 struct se_device *se_dev = se_cmd->se_dev;
c66ac9db 4107 struct se_mem *se_mem = in_se_mem;
e3d6f909 4108 struct target_core_fabric_ops *tfo = se_cmd->se_tfo;
c66ac9db
NB		 4109 u32 sg_length, task_size = task->task_size, task_sg_num_padded;
4110
4111 while (task_size != 0) {
4112 DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)"
4113 " se_mem->se_off(%u) task_offset(%u)\n",
4114 se_mem->se_page, se_mem->se_len,
4115 se_mem->se_off, task_offset);
4116
4117 if (task_offset == 0) {
4118 if (task_size >= se_mem->se_len) {
4119 sg_length = se_mem->se_len;
4120
4121 if (!(list_is_last(&se_mem->se_list,
a1d8b49a 4122 &se_cmd->t_mem_list)))
c66ac9db
NB		 4123 se_mem = list_entry(se_mem->se_list.next,
4124 struct se_mem, se_list);
4125 } else {
4126 sg_length = task_size;
4127 task_size -= sg_length;
4128 goto next;
4129 }
4130
4131 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4132 sg_length, task_size);
4133 } else {
4134 if ((se_mem->se_len - task_offset) > task_size) {
4135 sg_length = task_size;
4136 task_size -= sg_length;
4137 goto next;
4138 } else {
4139 sg_length = (se_mem->se_len - task_offset);
4140
4141 if (!(list_is_last(&se_mem->se_list,
a1d8b49a 4142 &se_cmd->t_mem_list)))
c66ac9db
NB		 4143 se_mem = list_entry(se_mem->se_list.next,
4144 struct se_mem, se_list);
4145 }
4146
4147 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4148 sg_length, task_size);
4149
4150 task_offset = 0;
4151 }
4152 task_size -= sg_length;
4153next:
4154 DEBUG_SC("task[%u] - Reducing task_size to(%u)\n",
4155 task->task_no, task_size);
4156
4157 task->task_sg_num++;
4158 }
4159 /*
4160 * Check if the fabric module driver is requesting that all
4161 * struct se_task->task_sg[] be chained together.. If so,
4162 * then allocate an extra padding SG entry for linking and
4163 * marking the end of the chained SGL.
4164 */
4165 if (tfo->task_sg_chaining) {
4166 task_sg_num_padded = (task->task_sg_num + 1);
4167 task->task_padded_sg = 1;
4168 } else
4169 task_sg_num_padded = task->task_sg_num;
4170
4171 task->task_sg = kzalloc(task_sg_num_padded *
4172 sizeof(struct scatterlist), GFP_KERNEL);
4173 if (!(task->task_sg)) {
4174 printk(KERN_ERR "Unable to allocate memory for"
4175 " task->task_sg\n");
e3d6f909 4176 return -ENOMEM;
c66ac9db
NB		 4177 }
4178 sg_init_table(&task->task_sg[0], task_sg_num_padded);
4179 /*
4180 * Setup task->task_sg_bidi for SCSI READ payload for
4181 * TCM/pSCSI passthrough if present for BIDI-COMMAND
4182 */
a1d8b49a 4183 if (!list_empty(&se_cmd->t_mem_bidi_list) &&
e3d6f909 4184 (se_dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) {
c66ac9db
NB		 4185 task->task_sg_bidi = kzalloc(task_sg_num_padded *
4186 sizeof(struct scatterlist), GFP_KERNEL);
4187 if (!(task->task_sg_bidi)) {
e3d6f909
AG		 4188 kfree(task->task_sg);
4189 task->task_sg = NULL;
c66ac9db
NB		 4190 printk(KERN_ERR "Unable to allocate memory for"
4191 " task->task_sg_bidi\n");
e3d6f909 4192 return -ENOMEM;
c66ac9db
NB		 4193 }
4194 sg_init_table(&task->task_sg_bidi[0], task_sg_num_padded);
4195 }
4196 /*
4197 * For the chaining case, setup the proper end of SGL for the
4198 * initial submission struct task into struct se_subsystem_api.
4199 * This will be cleared later by transport_do_task_sg_chain()
4200 */
4201 if (task->task_padded_sg) {
4202 sg_mark_end(&task->task_sg[task->task_sg_num - 1]);
4203 /*
4204 * Added the 'if' check before marking end of bi-directional
4205 * scatterlist (which gets created only in case of request
4206 * (RD + WR).
4207 */
4208 if (task->task_sg_bidi)
4209 sg_mark_end(&task->task_sg_bidi[task->task_sg_num - 1]);
4210 }
4211
4212 DEBUG_SC("Successfully allocated task->task_sg_num(%u),"
4213 " task_sg_num_padded(%u)\n", task->task_sg_num,
4214 task_sg_num_padded);
4215
4216 return task->task_sg_num;
4217}
4218
a1d8b49a
AG		 4219/* Reduce sectors if they are too long for the device */
4220static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 4221 struct se_device *dev,
4222 unsigned long long lba,
a1d8b49a 4223 sector_t sectors)
c66ac9db 4224{
a1d8b49a 4225 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 4226
a1d8b49a
AG		 4227 if (dev->transport->get_device_type(dev) == TYPE_DISK)
4228 if ((lba + sectors) > transport_dev_end_lba(dev))
4229 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 4230
a1d8b49a 4231 return sectors;
c66ac9db
NB		 4232}
4233
5951146d
AG		 4234/*
4235 * Convert a sgl into a linked list of se_mems.
4236 */
c66ac9db
NB		 4237static int transport_map_sg_to_mem(
4238 struct se_cmd *cmd,
4239 struct list_head *se_mem_list,
a1d8b49a 4240 struct scatterlist *sg)
c66ac9db
NB		 4241{
4242 struct se_mem *se_mem;
5951146d 4243 u32 cmd_size = cmd->data_length;
a1d8b49a 4244 int sg_count = 0;
c66ac9db 4245
5951146d 4246 WARN_ON(!sg);
c66ac9db
NB		 4247
4248 while (cmd_size) {
5951146d
AG		 4249 /*
4250 * NOTE: it is safe to return -ENOMEM at any time in creating this
4251 * list because transport_free_pages() will eventually be called, and is
4252 * smart enough to deallocate all list items for sg and sg_bidi lists.
4253 */
c66ac9db
NB		 4254 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4255 if (!(se_mem)) {
4256 printk(KERN_ERR "Unable to allocate struct se_mem\n");
e3d6f909 4257 return -ENOMEM;
c66ac9db
NB		 4258 }
4259 INIT_LIST_HEAD(&se_mem->se_list);
4260 DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u"
4261 " sg_page: %p offset: %d length: %d\n", cmd_size,
4262 sg_page(sg), sg->offset, sg->length);
4263
4264 se_mem->se_page = sg_page(sg);
4265 se_mem->se_off = sg->offset;
4266
4267 if (cmd_size > sg->length) {
4268 se_mem->se_len = sg->length;
4269 sg = sg_next(sg);
c66ac9db
NB		 4270 } else
4271 se_mem->se_len = cmd_size;
4272
4273 cmd_size -= se_mem->se_len;
a1d8b49a 4274 sg_count++;
c66ac9db 4275
5951146d
AG		 4276 DEBUG_MEM("sg_to_mem: sg_count: %u cmd_size: %u\n",
4277 sg_count, cmd_size);
c66ac9db
NB		 4278 DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n",
4279 se_mem->se_page, se_mem->se_off, se_mem->se_len);
4280
4281 list_add_tail(&se_mem->se_list, se_mem_list);
c66ac9db
NB		 4282 }
4283
5951146d 4284 DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments\n", sg_count);
c66ac9db 4285
a1d8b49a 4286 return sg_count;
c66ac9db
NB		 4287}
4288
4289/* transport_map_mem_to_sg():
4290 *
4291 *
4292 */
4293int transport_map_mem_to_sg(
4294 struct se_task *task,
4295 struct list_head *se_mem_list,
a1d8b49a 4296 struct scatterlist *sg,
c66ac9db
NB		 4297 struct se_mem *in_se_mem,
4298 struct se_mem **out_se_mem,
4299 u32 *se_mem_cnt,
4300 u32 *task_offset)
4301{
4302 struct se_cmd *se_cmd = task->task_se_cmd;
4303 struct se_mem *se_mem = in_se_mem;
c66ac9db
NB		 4304 u32 task_size = task->task_size, sg_no = 0;
4305
4306 if (!sg) {
4307 printk(KERN_ERR "Unable to locate valid struct"
4308 " scatterlist pointer\n");
e3d6f909 4309 return -EINVAL;
c66ac9db
NB		 4310 }
4311
4312 while (task_size != 0) {
4313 /*
a1d8b49a 4314 * Setup the contiguous array of scatterlists for
c66ac9db
NB		 4315 * this struct se_task.
4316 */
4317 sg_assign_page(sg, se_mem->se_page);
4318
4319 if (*task_offset == 0) {
4320 sg->offset = se_mem->se_off;
4321
4322 if (task_size >= se_mem->se_len) {
4323 sg->length = se_mem->se_len;
4324
4325 if (!(list_is_last(&se_mem->se_list,
a1d8b49a 4326 &se_cmd->t_mem_list))) {
c66ac9db
NB		 4327 se_mem = list_entry(se_mem->se_list.next,
4328 struct se_mem, se_list);
4329 (*se_mem_cnt)++;
4330 }
4331 } else {
4332 sg->length = task_size;
4333 /*
4334 * Determine if we need to calculate an offset
4335 * into the struct se_mem on the next go around..
4336 */
4337 task_size -= sg->length;
4338 if (!(task_size))
4339 *task_offset = sg->length;
4340
4341 goto next;
4342 }
4343
4344 } else {
4345 sg->offset = (*task_offset + se_mem->se_off);
4346
4347 if ((se_mem->se_len - *task_offset) > task_size) {
4348 sg->length = task_size;
4349 /*
4350 * Determine if we need to calculate an offset
4351 * into the struct se_mem on the next go around..
4352 */
4353 task_size -= sg->length;
4354 if (!(task_size))
4355 *task_offset += sg->length;
4356
4357 goto next;
4358 } else {
4359 sg->length = (se_mem->se_len - *task_offset);
4360
4361 if (!(list_is_last(&se_mem->se_list,
a1d8b49a 4362 &se_cmd->t_mem_list))) {
c66ac9db
NB		 4363 se_mem = list_entry(se_mem->se_list.next,
4364 struct se_mem, se_list);
4365 (*se_mem_cnt)++;
4366 }
4367 }
4368
4369 *task_offset = 0;
4370 }
4371 task_size -= sg->length;
4372next:
4373 DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing"
4374 " task_size to(%u), task_offset: %u\n", task->task_no, sg_no,
4375 sg_page(sg), sg->length, sg->offset, task_size, *task_offset);
4376
4377 sg_no++;
4378 if (!(task_size))
4379 break;
4380
4381 sg = sg_next(sg);
4382
4383 if (task_size > se_cmd->data_length)
4384 BUG();
4385 }
4386 *out_se_mem = se_mem;
4387
4388 DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)"
4389 " SGs\n", task->task_no, *se_mem_cnt, sg_no);
4390
4391 return 0;
4392}
4393
4394/*
4395 * This function can be used by HW target mode drivers to create a linked
4396 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4397 * This is intended to be called during the completion path by TCM Core
4398 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4399 */
4400void transport_do_task_sg_chain(struct se_cmd *cmd)
4401{
4402 struct scatterlist *sg_head = NULL, *sg_link = NULL, *sg_first = NULL;
4403 struct scatterlist *sg_head_cur = NULL, *sg_link_cur = NULL;
4404 struct scatterlist *sg, *sg_end = NULL, *sg_end_cur = NULL;
4405 struct se_task *task;
e3d6f909 4406 struct target_core_fabric_ops *tfo = cmd->se_tfo;
c66ac9db
NB		 4407 u32 task_sg_num = 0, sg_count = 0;
4408 int i;
4409
4410 if (tfo->task_sg_chaining == 0) {
4411 printk(KERN_ERR "task_sg_chaining is diabled for fabric module:"
4412 " %s\n", tfo->get_fabric_name());
4413 dump_stack();
4414 return;
4415 }
4416 /*
4417 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 4418 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 4419 */
a1d8b49a 4420 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 4421 if (!(task->task_sg) || !(task->task_padded_sg))
4422 continue;
4423
4424 if (sg_head && sg_link) {
4425 sg_head_cur = &task->task_sg[0];
4426 sg_link_cur = &task->task_sg[task->task_sg_num];
4427 /*
4428 * Either add chain or mark end of scatterlist
4429 */
4430 if (!(list_is_last(&task->t_list,
a1d8b49a 4431 &cmd->t_task_list))) {
c66ac9db
NB		 4432 /*
4433 * Clear existing SGL termination bit set in
e3d6f909 4434 * transport_init_task_sg(), see sg_mark_end()
c66ac9db
NB		 4435 */
4436 sg_end_cur = &task->task_sg[task->task_sg_num - 1];
4437 sg_end_cur->page_link &= ~0x02;
4438
4439 sg_chain(sg_head, task_sg_num, sg_head_cur);
c66ac9db 4440 sg_count += task->task_sg_num;
97868c89
NB		 4441 task_sg_num = (task->task_sg_num + 1);
4442 } else {
4443 sg_chain(sg_head, task_sg_num, sg_head_cur);
4444 sg_count += task->task_sg_num;
4445 task_sg_num = task->task_sg_num;
4446 }
c66ac9db
NB		 4447
4448 sg_head = sg_head_cur;
4449 sg_link = sg_link_cur;
c66ac9db
NB		 4450 continue;
4451 }
4452 sg_head = sg_first = &task->task_sg[0];
4453 sg_link = &task->task_sg[task->task_sg_num];
c66ac9db
NB		 4454 /*
4455 * Check for single task..
4456 */
a1d8b49a 4457 if (!(list_is_last(&task->t_list, &cmd->t_task_list))) {
c66ac9db
NB		 4458 /*
4459 * Clear existing SGL termination bit set in
e3d6f909 4460 * transport_init_task_sg(), see sg_mark_end()
c66ac9db
NB		 4461 */
4462 sg_end = &task->task_sg[task->task_sg_num - 1];
4463 sg_end->page_link &= ~0x02;
c66ac9db 4464 sg_count += task->task_sg_num;
97868c89
NB		 4465 task_sg_num = (task->task_sg_num + 1);
4466 } else {
4467 sg_count += task->task_sg_num;
4468 task_sg_num = task->task_sg_num;
4469 }
c66ac9db
NB		 4470 }
4471 /*
4472 * Setup the starting pointer and total t_tasks_sg_linked_no including
4473 * padding SGs for linking and to mark the end.
4474 */
a1d8b49a
AG		 4475 cmd->t_tasks_sg_chained = sg_first;
4476 cmd->t_tasks_sg_chained_no = sg_count;
c66ac9db 4477
a1d8b49a
AG		 4478 DEBUG_CMD_M("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
4479 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4480 cmd->t_tasks_sg_chained_no);
c66ac9db 4481
a1d8b49a
AG		 4482 for_each_sg(cmd->t_tasks_sg_chained, sg,
4483 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 4484
5951146d
AG		 4485 DEBUG_CMD_M("SG[%d]: %p page: %p length: %d offset: %d\n",
4486 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db
NB		 4487 if (sg_is_chain(sg))
4488 DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg);
4489 if (sg_is_last(sg))
4490 DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg);
4491 }
c66ac9db
NB		 4492}
4493EXPORT_SYMBOL(transport_do_task_sg_chain);
4494
4495static int transport_do_se_mem_map(
4496 struct se_device *dev,
4497 struct se_task *task,
4498 struct list_head *se_mem_list,
4499 void *in_mem,
4500 struct se_mem *in_se_mem,
4501 struct se_mem **out_se_mem,
4502 u32 *se_mem_cnt,
4503 u32 *task_offset_in)
4504{
4505 u32 task_offset = *task_offset_in;
4506 int ret = 0;
4507 /*
4508 * se_subsystem_api_t->do_se_mem_map is used when internal allocation
4509 * has been done by the transport plugin.
4510 */
e3d6f909
AG		 4511 if (dev->transport->do_se_mem_map) {
4512 ret = dev->transport->do_se_mem_map(task, se_mem_list,
c66ac9db
NB		 4513 in_mem, in_se_mem, out_se_mem, se_mem_cnt,
4514 task_offset_in);
4515 if (ret == 0)
a1d8b49a 4516 task->task_se_cmd->t_tasks_se_num += *se_mem_cnt;
c66ac9db
NB		 4517
4518 return ret;
4519 }
e63af958
NB		 4520
4521 BUG_ON(list_empty(se_mem_list));
c66ac9db
NB		 4522 /*
4523 * This is the normal path for all normal non BIDI and BIDI-COMMAND
4524 * WRITE payloads.. If we need to do BIDI READ passthrough for
4525 * TCM/pSCSI the first call to transport_do_se_mem_map ->
e3d6f909 4526 * transport_init_task_sg() -> transport_map_mem_to_sg() will do the
c66ac9db
NB		 4527 * allocation for task->task_sg_bidi, and the subsequent call to
4528 * transport_do_se_mem_map() from transport_generic_get_cdb_count()
4529 */
4530 if (!(task->task_sg_bidi)) {
4531 /*
4532 * Assume default that transport plugin speaks preallocated
4533 * scatterlists.
4534 */
e3d6f909
AG		 4535 ret = transport_init_task_sg(task, in_se_mem, task_offset);
4536 if (ret <= 0)
4537 return ret;
c66ac9db
NB		 4538 /*
4539 * struct se_task->task_sg now contains the struct scatterlist array.
4540 */
4541 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg,
4542 in_se_mem, out_se_mem, se_mem_cnt,
4543 task_offset_in);
4544 }
4545 /*
4546 * Handle the se_mem_list -> struct task->task_sg_bidi
4547 * memory map for the extra BIDI READ payload
4548 */
4549 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg_bidi,
4550 in_se_mem, out_se_mem, se_mem_cnt,
4551 task_offset_in);
4552}
4553
a1d8b49a
AG		 4554/*
4555 * Break up cmd into chunks transport can handle
4556 */
4557static u32 transport_allocate_tasks(
c66ac9db
NB		 4558 struct se_cmd *cmd,
4559 unsigned long long lba,
4560 u32 sectors,
4561 enum dma_data_direction data_direction,
4562 struct list_head *mem_list,
4563 int set_counts)
4564{
4565 unsigned char *cdb = NULL;
4566 struct se_task *task;
a1d8b49a
AG		 4567 struct se_mem *se_mem = NULL;
4568 struct se_mem *se_mem_lout = NULL;
4569 struct se_mem *se_mem_bidi = NULL;
4570 struct se_mem *se_mem_bidi_lout = NULL;
5951146d 4571 struct se_device *dev = cmd->se_dev;
a1d8b49a
AG		 4572 int ret;
4573 u32 task_offset_in = 0;
4574 u32 se_mem_cnt = 0;
4575 u32 se_mem_bidi_cnt = 0;
4576 u32 task_cdbs = 0;
c66ac9db 4577
a1d8b49a 4578 BUG_ON(!mem_list);
c66ac9db
NB		 4579 /*
4580 * While using RAMDISK_DR backstores is the only case where
4581 * mem_list will ever be empty at this point.
4582 */
4583 if (!(list_empty(mem_list)))
5951146d 4584 se_mem = list_first_entry(mem_list, struct se_mem, se_list);
c66ac9db
NB		 4585 /*
4586 * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to
4587 * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation
4588 */
a1d8b49a 4589 if (!list_empty(&cmd->t_mem_bidi_list) &&
e3d6f909 4590 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV))
a1d8b49a 4591 se_mem_bidi = list_first_entry(&cmd->t_mem_bidi_list,
c66ac9db
NB		 4592 struct se_mem, se_list);
4593
4594 while (sectors) {
a1d8b49a
AG		 4595 sector_t limited_sectors;
4596
c66ac9db 4597 DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n",
e3d6f909 4598 cmd->se_tfo->get_task_tag(cmd), lba, sectors,
c66ac9db
NB		 4599 transport_dev_end_lba(dev));
4600
a1d8b49a
AG		 4601 limited_sectors = transport_limit_task_sectors(dev, lba, sectors);
4602 if (!limited_sectors)
4603 break;
4604
c66ac9db 4605 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 4606 if (!task)
c66ac9db
NB		 4607 goto out;
4608
c66ac9db 4609 task->task_lba = lba;
a1d8b49a 4610 task->task_sectors = limited_sectors;
c66ac9db
NB		 4611 lba += task->task_sectors;
4612 sectors -= task->task_sectors;
4613 task->task_size = (task->task_sectors *
e3d6f909 4614 dev->se_sub_dev->se_dev_attrib.block_size);
c66ac9db 4615
e3d6f909 4616 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4617 /* Should be part of task, can't fail */
4618 BUG_ON(!cdb);
4619
4620 memcpy(cdb, cmd->t_task_cdb,
4621 scsi_command_size(cmd->t_task_cdb));
4622
4623 /* Update new cdb with updated lba/sectors */
4624 cmd->transport_split_cdb(task->task_lba,
4625 &task->task_sectors, cdb);
c66ac9db
NB		 4626
4627 /*
4628 * Perform the SE OBJ plugin and/or Transport plugin specific
a1d8b49a 4629 * mapping for cmd->t_mem_list. And setup the
c66ac9db
NB		 4630 * task->task_sg and if necessary task->task_sg_bidi
4631 */
4632 ret = transport_do_se_mem_map(dev, task, mem_list,
4633 NULL, se_mem, &se_mem_lout, &se_mem_cnt,
4634 &task_offset_in);
4635 if (ret < 0)
4636 goto out;
4637
4638 se_mem = se_mem_lout;
4639 /*
a1d8b49a 4640 * Setup the cmd->t_mem_bidi_list -> task->task_sg_bidi
c66ac9db
NB		 4641 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI
4642 *
4643 * Note that the first call to transport_do_se_mem_map() above will
4644 * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map()
e3d6f909 4645 * -> transport_init_task_sg(), and the second here will do the
c66ac9db
NB		 4646 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI.
4647 */
4648 if (task->task_sg_bidi != NULL) {
4649 ret = transport_do_se_mem_map(dev, task,
a1d8b49a 4650 &cmd->t_mem_bidi_list, NULL,
c66ac9db
NB		 4651 se_mem_bidi, &se_mem_bidi_lout, &se_mem_bidi_cnt,
4652 &task_offset_in);
4653 if (ret < 0)
4654 goto out;
4655
4656 se_mem_bidi = se_mem_bidi_lout;
4657 }
4658 task_cdbs++;
4659
4660 DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
4661 task_cdbs, task->task_sg_num);
c66ac9db
NB		 4662 }
4663
4664 if (set_counts) {
a1d8b49a
AG		 4665 atomic_inc(&cmd->t_fe_count);
4666 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 4667 }
4668
4669 DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
e3d6f909 4670 cmd->se_tfo->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE)
c66ac9db
NB		 4671 ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs);
4672
4673 return task_cdbs;
4674out:
4675 return 0;
4676}
4677
4678static int
4679transport_map_control_cmd_to_task(struct se_cmd *cmd)
4680{
5951146d 4681 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4682 unsigned char *cdb;
4683 struct se_task *task;
4684 int ret;
4685
4686 task = transport_generic_get_task(cmd, cmd->data_direction);
4687 if (!task)
4688 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4689
e3d6f909 4690 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4691 BUG_ON(!cdb);
4692 memcpy(cdb, cmd->t_task_cdb,
4693 scsi_command_size(cmd->t_task_cdb));
c66ac9db
NB		 4694
4695 task->task_size = cmd->data_length;
4696 task->task_sg_num =
4697 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) ? 1 : 0;
4698
a1d8b49a
AG		 4699 atomic_inc(&cmd->t_fe_count);
4700 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 4701
4702 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
4703 struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
4704 u32 se_mem_cnt = 0, task_offset = 0;
4705
a1d8b49a
AG		 4706 if (!list_empty(&cmd->t_mem_list))
4707 se_mem = list_first_entry(&cmd->t_mem_list,
e63af958 4708 struct se_mem, se_list);
c66ac9db
NB		 4709
4710 ret = transport_do_se_mem_map(dev, task,
a1d8b49a 4711 &cmd->t_mem_list, NULL, se_mem,
c66ac9db
NB		 4712 &se_mem_lout, &se_mem_cnt, &task_offset);
4713 if (ret < 0)
4714 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4715
4716 if (dev->transport->map_task_SG)
4717 return dev->transport->map_task_SG(task);
4718 return 0;
4719 } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
4720 if (dev->transport->map_task_non_SG)
4721 return dev->transport->map_task_non_SG(task);
4722 return 0;
4723 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4724 if (dev->transport->cdb_none)
4725 return dev->transport->cdb_none(task);
4726 return 0;
4727 } else {
4728 BUG();
4729 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4730 }
4731}
4732
4733/* transport_generic_new_cmd(): Called from transport_processing_thread()
4734 *
4735 * Allocate storage transport resources from a set of values predefined
4736 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4737 * Any non zero return here is treated as an "out of resource' op here.
4738 */
4739 /*
4740 * Generate struct se_task(s) and/or their payloads for this CDB.
4741 */
a1d8b49a 4742int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4743{
c66ac9db 4744 struct se_task *task;
5951146d 4745 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4746 int ret = 0;
4747
4748 /*
4749 * Determine is the TCM fabric module has already allocated physical
4750 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4751 * to setup beforehand the linked list of physical memory at
a1d8b49a 4752 * cmd->t_mem_list of struct se_mem->se_page
c66ac9db
NB		 4753 */
4754 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
4755 ret = transport_allocate_resources(cmd);
4756 if (ret < 0)
4757 return ret;
4758 }
4759
c66ac9db
NB		 4760 ret = transport_new_cmd_obj(cmd);
4761 if (ret < 0)
4762 return ret;
4763
c66ac9db 4764 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
a1d8b49a 4765 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 4766 if (atomic_read(&task->task_sent))
4767 continue;
4768 if (!dev->transport->map_task_SG)
4769 continue;
4770
4771 ret = dev->transport->map_task_SG(task);
4772 if (ret < 0)
4773 return ret;
4774 }
4775 } else {
4776 ret = transport_map_control_cmd_to_task(cmd);
4777 if (ret < 0)
4778 return ret;
4779 }
4780
4781 /*
a1d8b49a 4782 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4783 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4784 * will be added to the struct se_device execution queue after its WRITE
4785 * data has arrived. (ie: It gets handled by the transport processing
4786 * thread a second time)
4787 */
4788 if (cmd->data_direction == DMA_TO_DEVICE) {
4789 transport_add_tasks_to_state_queue(cmd);
4790 return transport_generic_write_pending(cmd);
4791 }
4792 /*
4793 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4794 * to the execution queue.
4795 */
4796 transport_execute_tasks(cmd);
4797 return 0;
4798}
a1d8b49a 4799EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4800
4801/* transport_generic_process_write():
4802 *
4803 *
4804 */
4805void transport_generic_process_write(struct se_cmd *cmd)
4806{
4807#if 0
4808 /*
4809 * Copy SCSI Presented DTL sector(s) from received buffers allocated to
4810 * original EDTL
4811 */
4812 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
a1d8b49a 4813 if (!cmd->t_tasks_se_num) {
c66ac9db 4814 unsigned char *dst, *buf =
a1d8b49a 4815 (unsigned char *)cmd->t_task_buf;
c66ac9db
NB		 4816
4817 dst = kzalloc(cmd->cmd_spdtl), GFP_KERNEL);
4818 if (!(dst)) {
4819 printk(KERN_ERR "Unable to allocate memory for"
4820 " WRITE underflow\n");
4821 transport_generic_request_failure(cmd, NULL,
4822 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
4823 return;
4824 }
4825 memcpy(dst, buf, cmd->cmd_spdtl);
4826
a1d8b49a
AG		 4827 kfree(cmd->t_task_buf);
4828 cmd->t_task_buf = dst;
c66ac9db
NB		 4829 } else {
4830 struct scatterlist *sg =
a1d8b49a 4831 (struct scatterlist *sg)cmd->t_task_buf;
c66ac9db
NB		 4832 struct scatterlist *orig_sg;
4833
4834 orig_sg = kzalloc(sizeof(struct scatterlist) *
a1d8b49a 4835 cmd->t_tasks_se_num,
c66ac9db
NB		 4836 GFP_KERNEL))) {
4837 if (!(orig_sg)) {
4838 printk(KERN_ERR "Unable to allocate memory"
4839 " for WRITE underflow\n");
4840 transport_generic_request_failure(cmd, NULL,
4841 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
4842 return;
4843 }
4844
a1d8b49a 4845 memcpy(orig_sg, cmd->t_task_buf,
c66ac9db 4846 sizeof(struct scatterlist) *
a1d8b49a 4847 cmd->t_tasks_se_num);
c66ac9db
NB		 4848
4849 cmd->data_length = cmd->cmd_spdtl;
4850 /*
4851 * FIXME, clear out original struct se_task and state
4852 * information.
4853 */
4854 if (transport_generic_new_cmd(cmd) < 0) {
4855 transport_generic_request_failure(cmd, NULL,
4856 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
4857 kfree(orig_sg);
4858 return;
4859 }
4860
4861 transport_memcpy_write_sg(cmd, orig_sg);
4862 }
4863 }
4864#endif
4865 transport_execute_tasks(cmd);
4866}
4867EXPORT_SYMBOL(transport_generic_process_write);
4868
4869/* transport_generic_write_pending():
4870 *
4871 *
4872 */
4873static int transport_generic_write_pending(struct se_cmd *cmd)
4874{
4875 unsigned long flags;
4876 int ret;
4877
a1d8b49a 4878 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4879 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4880 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4881 /*
4882 * For the TCM control CDBs using a contiguous buffer, do the memcpy
4883 * from the passed Linux/SCSI struct scatterlist located at
a1d8b49a
AG		 4884 * se_cmd->t_task_pt_sgl to the contiguous buffer at
4885 * se_cmd->t_task_buf.
c66ac9db
NB		 4886 */
4887 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
a1d8b49a
AG		 4888 sg_copy_to_buffer(cmd->t_task_pt_sgl,
4889 cmd->t_task_pt_sgl_num,
4890 cmd->t_task_buf,
4891 cmd->data_length);
c66ac9db
NB		 4892 /*
4893 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4894 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4895 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4896 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4897 * because the se_cmd->se_lun pointer is not being cleared.
4898 */
4899 transport_cmd_check_stop(cmd, 1, 0);
4900
4901 /*
4902 * Call the fabric write_pending function here to let the
4903 * frontend know that WRITE buffers are ready.
4904 */
e3d6f909 4905 ret = cmd->se_tfo->write_pending(cmd);
c66ac9db
NB		 4906 if (ret < 0)
4907 return ret;
4908
4909 return PYX_TRANSPORT_WRITE_PENDING;
4910}
4911
35462975 4912void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4913{
e3d6f909 4914 BUG_ON(!cmd->se_tfo);
c66ac9db
NB		 4915
4916 transport_free_se_cmd(cmd);
35462975 4917 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4918}
35462975 4919EXPORT_SYMBOL(transport_release_cmd);
c66ac9db
NB		 4920
4921/* transport_generic_free_cmd():
4922 *
4923 * Called from processing frontend to release storage engine resources
4924 */
4925void transport_generic_free_cmd(
4926 struct se_cmd *cmd,
4927 int wait_for_tasks,
c66ac9db
NB		 4928 int session_reinstatement)
4929{
5951146d 4930 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
35462975 4931 transport_release_cmd(cmd);
c66ac9db
NB		 4932 else {
4933 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4934
e3d6f909 4935 if (cmd->se_lun) {
c66ac9db
NB		 4936#if 0
4937 printk(KERN_INFO "cmd: %p ITT: 0x%08x contains"
e3d6f909
AG		 4938 " cmd->se_lun\n", cmd,
4939 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4940#endif
4941 transport_lun_remove_cmd(cmd);
4942 }
4943
4944 if (wait_for_tasks && cmd->transport_wait_for_tasks)
4945 cmd->transport_wait_for_tasks(cmd, 0, 0);
4946
f4366772
NB		 4947 transport_free_dev_tasks(cmd);
4948
35462975 4949 transport_generic_remove(cmd, session_reinstatement);
c66ac9db
NB		 4950 }
4951}
4952EXPORT_SYMBOL(transport_generic_free_cmd);
4953
4954static void transport_nop_wait_for_tasks(
4955 struct se_cmd *cmd,
4956 int remove_cmd,
4957 int session_reinstatement)
4958{
4959 return;
4960}
4961
4962/* transport_lun_wait_for_tasks():
4963 *
4964 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4965 * an struct se_lun to be successfully shutdown.
4966 */
4967static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4968{
4969 unsigned long flags;
4970 int ret;
4971 /*
4972 * If the frontend has already requested this struct se_cmd to
4973 * be stopped, we can safely ignore this struct se_cmd.
4974 */
a1d8b49a
AG		 4975 spin_lock_irqsave(&cmd->t_state_lock, flags);
4976 if (atomic_read(&cmd->t_transport_stop)) {
4977 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4978 DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4979 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4980 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4981 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4982 return -EPERM;
c66ac9db 4983 }
a1d8b49a
AG		 4984 atomic_set(&cmd->transport_lun_fe_stop, 1);
4985 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4986
5951146d 4987 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4988
4989 ret = transport_stop_tasks_for_cmd(cmd);
4990
4991 DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:"
a1d8b49a 4992 " %d\n", cmd, cmd->t_task_cdbs, ret);
c66ac9db
NB		 4993 if (!ret) {
4994 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4995 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4996 wait_for_completion(&cmd->transport_lun_stop_comp);
c66ac9db 4997 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4998 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4999 }
5951146d 5000 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5001
5002 return 0;
5003}
5004
5005/* #define DEBUG_CLEAR_LUN */
5006#ifdef DEBUG_CLEAR_LUN
5007#define DEBUG_CLEAR_L(x...) printk(KERN_INFO x)
5008#else
5009#define DEBUG_CLEAR_L(x...)
5010#endif
5011
5012static void __transport_clear_lun_from_sessions(struct se_lun *lun)
5013{
5014 struct se_cmd *cmd = NULL;
5015 unsigned long lun_flags, cmd_flags;
5016 /*
5017 * Do exception processing and return CHECK_CONDITION status to the
5018 * Initiator Port.
5019 */
5020 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 5021 while (!list_empty(&lun->lun_cmd_list)) {
5022 cmd = list_first_entry(&lun->lun_cmd_list,
5023 struct se_cmd, se_lun_node);
5024 list_del(&cmd->se_lun_node);
5025
a1d8b49a 5026 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 5027 /*
5028 * This will notify iscsi_target_transport.c:
5029 * transport_cmd_check_stop() that a LUN shutdown is in
5030 * progress for the iscsi_cmd_t.
5031 */
a1d8b49a
AG		 5032 spin_lock(&cmd->t_state_lock);
5033 DEBUG_CLEAR_L("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 5034 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 5035 cmd->se_lun->unpacked_lun,
5036 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 5037 atomic_set(&cmd->transport_lun_stop, 1);
5038 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 5039
5040 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5041
e3d6f909 5042 if (!(cmd->se_lun)) {
c66ac9db 5043 printk(KERN_ERR "ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 5044 cmd->se_tfo->get_task_tag(cmd),
5045 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 5046 BUG();
5047 }
5048 /*
5049 * If the Storage engine still owns the iscsi_cmd_t, determine
5050 * and/or stop its context.
5051 */
5052 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 5053 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
5054 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5055
e3d6f909 5056 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 5057 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5058 continue;
5059 }
5060
5061 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
5062 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 5063 cmd->se_lun->unpacked_lun,
5064 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5065
a1d8b49a
AG		 5066 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
5067 if (!(atomic_read(&cmd->transport_dev_active))) {
5068 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 5069 goto check_cond;
5070 }
a1d8b49a 5071 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 5072 transport_all_task_dev_remove_state(cmd);
a1d8b49a 5073 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 5074
5075 transport_free_dev_tasks(cmd);
5076 /*
5077 * The Storage engine stopped this struct se_cmd before it was
5078 * send to the fabric frontend for delivery back to the
5079 * Initiator Node. Return this SCSI CDB back with an
5080 * CHECK_CONDITION status.
5081 */
5082check_cond:
5083 transport_send_check_condition_and_sense(cmd,
5084 TCM_NON_EXISTENT_LUN, 0);
5085 /*
5086 * If the fabric frontend is waiting for this iscsi_cmd_t to
5087 * be released, notify the waiting thread now that LU has
5088 * finished accessing it.
5089 */
a1d8b49a
AG		 5090 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
5091 if (atomic_read(&cmd->transport_lun_fe_stop)) {
c66ac9db
NB		 5092 DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for"
5093 " struct se_cmd: %p ITT: 0x%08x\n",
5094 lun->unpacked_lun,
e3d6f909 5095 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5096
a1d8b49a 5097 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 5098 cmd_flags);
5099 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 5100 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 5101 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5102 continue;
5103 }
5104 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 5105 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5106
a1d8b49a 5107 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 5108 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5109 }
5110 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5111}
5112
5113static int transport_clear_lun_thread(void *p)
5114{
5115 struct se_lun *lun = (struct se_lun *)p;
5116
5117 __transport_clear_lun_from_sessions(lun);
5118 complete(&lun->lun_shutdown_comp);
5119
5120 return 0;
5121}
5122
5123int transport_clear_lun_from_sessions(struct se_lun *lun)
5124{
5125 struct task_struct *kt;
5126
5951146d 5127 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 5128 "tcm_cl_%u", lun->unpacked_lun);
5129 if (IS_ERR(kt)) {
5130 printk(KERN_ERR "Unable to start clear_lun thread\n");
e3d6f909 5131 return PTR_ERR(kt);
c66ac9db
NB		 5132 }
5133 wait_for_completion(&lun->lun_shutdown_comp);
5134
5135 return 0;
5136}
5137
5138/* transport_generic_wait_for_tasks():
5139 *
5140 * Called from frontend or passthrough context to wait for storage engine
5141 * to pause and/or release frontend generated struct se_cmd.
5142 */
5143static void transport_generic_wait_for_tasks(
5144 struct se_cmd *cmd,
5145 int remove_cmd,
5146 int session_reinstatement)
5147{
5148 unsigned long flags;
5149
5150 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
5151 return;
5152
a1d8b49a 5153 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 5154 /*
5155 * If we are already stopped due to an external event (ie: LUN shutdown)
5156 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 5157 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 5158 * transport_clear_lun_from_sessions() once the ConfigFS context caller
5159 * has completed its operation on the struct se_cmd.
5160 */
a1d8b49a 5161 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db
NB		 5162
5163 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping"
e3d6f909 5164 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 5165 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 5166 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 5167 /*
5168 * There is a special case for WRITES where a FE exception +
5169 * LUN shutdown means ConfigFS context is still sleeping on
5170 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
5171 * We go ahead and up transport_lun_stop_comp just to be sure
5172 * here.
5173 */
a1d8b49a
AG		 5174 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
5175 complete(&cmd->transport_lun_stop_comp);
5176 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
5177 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 5178
5179 transport_all_task_dev_remove_state(cmd);
5180 /*
5181 * At this point, the frontend who was the originator of this
5182 * struct se_cmd, now owns the structure and can be released through
5183 * normal means below.
5184 */
5185 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped"
e3d6f909 5186 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 5187 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 5188 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5189
a1d8b49a 5190 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 5191 }
a1d8b49a
AG		 5192 if (!atomic_read(&cmd->t_transport_active) ||
5193 atomic_read(&cmd->t_transport_aborted))
c66ac9db
NB		 5194 goto remove;
5195
a1d8b49a 5196 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db
NB		 5197
5198 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x"
5199 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 5200 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
5201 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 5202 cmd->deferred_t_state);
5203
a1d8b49a 5204 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 5205
5951146d 5206 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 5207
a1d8b49a 5208 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 5209
a1d8b49a
AG		 5210 spin_lock_irqsave(&cmd->t_state_lock, flags);
5211 atomic_set(&cmd->t_transport_active, 0);
5212 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db
NB		 5213
5214 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 5215 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 5216 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5217remove:
a1d8b49a 5218 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 5219 if (!remove_cmd)
5220 return;
5221
35462975 5222 transport_generic_free_cmd(cmd, 0, session_reinstatement);
c66ac9db
NB		 5223}
5224
5225static int transport_get_sense_codes(
5226 struct se_cmd *cmd,
5227 u8 *asc,
5228 u8 *ascq)
5229{
5230 *asc = cmd->scsi_asc;
5231 *ascq = cmd->scsi_ascq;
5232
5233 return 0;
5234}
5235
5236static int transport_set_sense_codes(
5237 struct se_cmd *cmd,
5238 u8 asc,
5239 u8 ascq)
5240{
5241 cmd->scsi_asc = asc;
5242 cmd->scsi_ascq = ascq;
5243
5244 return 0;
5245}
5246
5247int transport_send_check_condition_and_sense(
5248 struct se_cmd *cmd,
5249 u8 reason,
5250 int from_transport)
5251{
5252 unsigned char *buffer = cmd->sense_buffer;
5253 unsigned long flags;
5254 int offset;
5255 u8 asc = 0, ascq = 0;
5256
a1d8b49a 5257 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 5258 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 5259 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 5260 return 0;
5261 }
5262 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 5263 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 5264
5265 if (!reason && from_transport)
5266 goto after_reason;
5267
5268 if (!from_transport)
5269 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
5270 /*
5271 * Data Segment and SenseLength of the fabric response PDU.
5272 *
5273 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
5274 * from include/scsi/scsi_cmnd.h
5275 */
e3d6f909 5276 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 5277 TRANSPORT_SENSE_BUFFER);
5278 /*
5279 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
5280 * SENSE KEY values from include/scsi/scsi.h
5281 */
5282 switch (reason) {
5283 case TCM_NON_EXISTENT_LUN:
5284 case TCM_UNSUPPORTED_SCSI_OPCODE:
5285 case TCM_SECTOR_COUNT_TOO_MANY:
5286 /* CURRENT ERROR */
5287 buffer[offset] = 0x70;
5288 /* ILLEGAL REQUEST */
5289 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5290 /* INVALID COMMAND OPERATION CODE */
5291 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
5292 break;
5293 case TCM_UNKNOWN_MODE_PAGE:
5294 /* CURRENT ERROR */
5295 buffer[offset] = 0x70;
5296 /* ILLEGAL REQUEST */
5297 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5298 /* INVALID FIELD IN CDB */
5299 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5300 break;
5301 case TCM_CHECK_CONDITION_ABORT_CMD:
5302 /* CURRENT ERROR */
5303 buffer[offset] = 0x70;
5304 /* ABORTED COMMAND */
5305 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5306 /* BUS DEVICE RESET FUNCTION OCCURRED */
5307 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
5308 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
5309 break;
5310 case TCM_INCORRECT_AMOUNT_OF_DATA:
5311 /* CURRENT ERROR */
5312 buffer[offset] = 0x70;
5313 /* ABORTED COMMAND */
5314 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5315 /* WRITE ERROR */
5316 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5317 /* NOT ENOUGH UNSOLICITED DATA */
5318 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
5319 break;
5320 case TCM_INVALID_CDB_FIELD:
5321 /* CURRENT ERROR */
5322 buffer[offset] = 0x70;
5323 /* ABORTED COMMAND */
5324 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5325 /* INVALID FIELD IN CDB */
5326 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5327 break;
5328 case TCM_INVALID_PARAMETER_LIST:
5329 /* CURRENT ERROR */
5330 buffer[offset] = 0x70;
5331 /* ABORTED COMMAND */
5332 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5333 /* INVALID FIELD IN PARAMETER LIST */
5334 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
5335 break;
5336 case TCM_UNEXPECTED_UNSOLICITED_DATA:
5337 /* CURRENT ERROR */
5338 buffer[offset] = 0x70;
5339 /* ABORTED COMMAND */
5340 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5341 /* WRITE ERROR */
5342 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5343 /* UNEXPECTED_UNSOLICITED_DATA */
5344 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
5345 break;
5346 case TCM_SERVICE_CRC_ERROR:
5347 /* CURRENT ERROR */
5348 buffer[offset] = 0x70;
5349 /* ABORTED COMMAND */
5350 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5351 /* PROTOCOL SERVICE CRC ERROR */
5352 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
5353 /* N/A */
5354 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
5355 break;
5356 case TCM_SNACK_REJECTED:
5357 /* CURRENT ERROR */
5358 buffer[offset] = 0x70;
5359 /* ABORTED COMMAND */
5360 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5361 /* READ ERROR */
5362 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
5363 /* FAILED RETRANSMISSION REQUEST */
5364 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
5365 break;
5366 case TCM_WRITE_PROTECTED:
5367 /* CURRENT ERROR */
5368 buffer[offset] = 0x70;
5369 /* DATA PROTECT */
5370 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
5371 /* WRITE PROTECTED */
5372 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
5373 break;
5374 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
5375 /* CURRENT ERROR */
5376 buffer[offset] = 0x70;
5377 /* UNIT ATTENTION */
5378 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
5379 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
5380 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5381 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5382 break;
5383 case TCM_CHECK_CONDITION_NOT_READY:
5384 /* CURRENT ERROR */
5385 buffer[offset] = 0x70;
5386 /* Not Ready */
5387 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
5388 transport_get_sense_codes(cmd, &asc, &ascq);
5389 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5390 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5391 break;
5392 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
5393 default:
5394 /* CURRENT ERROR */
5395 buffer[offset] = 0x70;
5396 /* ILLEGAL REQUEST */
5397 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5398 /* LOGICAL UNIT COMMUNICATION FAILURE */
5399 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
5400 break;
5401 }
5402 /*
5403 * This code uses linux/include/scsi/scsi.h SAM status codes!
5404 */
5405 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
5406 /*
5407 * Automatically padded, this value is encoded in the fabric's
5408 * data_length response PDU containing the SCSI defined sense data.
5409 */
5410 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
5411
5412after_reason:
e3d6f909 5413 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 5414 return 0;
5415}
5416EXPORT_SYMBOL(transport_send_check_condition_and_sense);
5417
5418int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
5419{
5420 int ret = 0;
5421
a1d8b49a 5422 if (atomic_read(&cmd->t_transport_aborted) != 0) {
c66ac9db
NB		 5423 if (!(send_status) ||
5424 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
5425 return 1;
5426#if 0
5427 printk(KERN_INFO "Sending delayed SAM_STAT_TASK_ABORTED"
5428 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 5429 cmd->t_task_cdb[0],
e3d6f909 5430 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 5431#endif
5432 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 5433 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 5434 ret = 1;
5435 }
5436 return ret;
5437}
5438EXPORT_SYMBOL(transport_check_aborted_status);
5439
5440void transport_send_task_abort(struct se_cmd *cmd)
5441{
5442 /*
5443 * If there are still expected incoming fabric WRITEs, we wait
5444 * until until they have completed before sending a TASK_ABORTED
5445 * response. This response with TASK_ABORTED status will be
5446 * queued back to fabric module by transport_check_aborted_status().
5447 */
5448 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 5449 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 5450 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 5451 smp_mb__after_atomic_inc();
5452 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5453 transport_new_cmd_failure(cmd);
5454 return;
5455 }
5456 }
5457 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5458#if 0
5459 printk(KERN_INFO "Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 5460 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 5461 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 5462#endif
e3d6f909 5463 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 5464}
5465
5466/* transport_generic_do_tmr():
5467 *
5468 *
5469 */
5470int transport_generic_do_tmr(struct se_cmd *cmd)
5471{
5951146d 5472 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 5473 struct se_tmr_req *tmr = cmd->se_tmr_req;
5474 int ret;
5475
5476 switch (tmr->function) {
5c6cd613 5477 case TMR_ABORT_TASK:
c66ac9db
NB		 5478 tmr->response = TMR_FUNCTION_REJECTED;
5479 break;
5c6cd613
NB		 5480 case TMR_ABORT_TASK_SET:
5481 case TMR_CLEAR_ACA:
5482 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 5483 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
5484 break;
5c6cd613 5485 case TMR_LUN_RESET:
c66ac9db
NB		 5486 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
5487 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
5488 TMR_FUNCTION_REJECTED;
5489 break;
5c6cd613 5490 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 5491 tmr->response = TMR_FUNCTION_REJECTED;
5492 break;
5c6cd613 5493 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 5494 tmr->response = TMR_FUNCTION_REJECTED;
5495 break;
c66ac9db
NB		 5496 default:
5497 printk(KERN_ERR "Uknown TMR function: 0x%02x.\n",
5498 tmr->function);
5499 tmr->response = TMR_FUNCTION_REJECTED;
5500 break;
5501 }
5502
5503 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 5504 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 5505
5506 transport_cmd_check_stop(cmd, 2, 0);
5507 return 0;
5508}
5509
5510/*
5511 * Called with spin_lock_irq(&dev->execute_task_lock); held
5512 *
5513 */
5514static struct se_task *
5515transport_get_task_from_state_list(struct se_device *dev)
5516{
5517 struct se_task *task;
5518
5519 if (list_empty(&dev->state_task_list))
5520 return NULL;
5521
5522 list_for_each_entry(task, &dev->state_task_list, t_state_list)
5523 break;
5524
5525 list_del(&task->t_state_list);
5526 atomic_set(&task->task_state_active, 0);
5527
5528 return task;
5529}
5530
5531static void transport_processing_shutdown(struct se_device *dev)
5532{
5533 struct se_cmd *cmd;
c66ac9db 5534 struct se_task *task;
c66ac9db
NB		 5535 unsigned long flags;
5536 /*
5537 * Empty the struct se_device's struct se_task state list.
5538 */
5539 spin_lock_irqsave(&dev->execute_task_lock, flags);
5540 while ((task = transport_get_task_from_state_list(dev))) {
e3d6f909
AG		 5541 if (!task->task_se_cmd) {
5542 printk(KERN_ERR "task->task_se_cmd is NULL!\n");
c66ac9db
NB		 5543 continue;
5544 }
e3d6f909 5545 cmd = task->task_se_cmd;
c66ac9db 5546
c66ac9db
NB		 5547 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5548
a1d8b49a 5549 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 5550
5551 DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x,"
5552 " i_state/def_i_state: %d/%d, t_state/def_t_state:"
5553 " %d/%d cdb: 0x%02x\n", cmd, task,
e3d6f909
AG		 5554 cmd->se_tfo->get_task_tag(cmd), cmd->cmd_sn,
5555 cmd->se_tfo->get_cmd_state(cmd), cmd->deferred_i_state,
c66ac9db 5556 cmd->t_state, cmd->deferred_t_state,
a1d8b49a 5557 cmd->t_task_cdb[0]);
c66ac9db
NB		 5558 DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:"
5559 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5560 " t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909 5561 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a
AG		 5562 cmd->t_task_cdbs,
5563 atomic_read(&cmd->t_task_cdbs_left),
5564 atomic_read(&cmd->t_task_cdbs_sent),
5565 atomic_read(&cmd->t_transport_active),
5566 atomic_read(&cmd->t_transport_stop),
5567 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 5568
5569 if (atomic_read(&task->task_active)) {
5570 atomic_set(&task->task_stop, 1);
5571 spin_unlock_irqrestore(
a1d8b49a 5572 &cmd->t_state_lock, flags);
c66ac9db
NB		 5573
5574 DEBUG_DO("Waiting for task: %p to shutdown for dev:"
5575 " %p\n", task, dev);
5576 wait_for_completion(&task->task_stop_comp);
5577 DEBUG_DO("Completed task: %p shutdown for dev: %p\n",
5578 task, dev);
5579
a1d8b49a
AG		 5580 spin_lock_irqsave(&cmd->t_state_lock, flags);
5581 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 5582
5583 atomic_set(&task->task_active, 0);
5584 atomic_set(&task->task_stop, 0);
52208ae3
NB		 5585 } else {
5586 if (atomic_read(&task->task_execute_queue) != 0)
5587 transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 5588 }
5589 __transport_stop_task_timer(task, &flags);
5590
a1d8b49a 5591 if (!(atomic_dec_and_test(&cmd->t_task_cdbs_ex_left))) {
c66ac9db 5592 spin_unlock_irqrestore(
a1d8b49a 5593 &cmd->t_state_lock, flags);
c66ac9db
NB		 5594
5595 DEBUG_DO("Skipping task: %p, dev: %p for"
5596 " t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a 5597 atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db
NB		 5598
5599 spin_lock_irqsave(&dev->execute_task_lock, flags);
5600 continue;
5601 }
5602
a1d8b49a 5603 if (atomic_read(&cmd->t_transport_active)) {
c66ac9db
NB		 5604 DEBUG_DO("got t_transport_active = 1 for task: %p, dev:"
5605 " %p\n", task, dev);
5606
a1d8b49a 5607 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5608 spin_unlock_irqrestore(
a1d8b49a 5609 &cmd->t_state_lock, flags);
c66ac9db
NB		 5610 transport_send_check_condition_and_sense(
5611 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5612 0);
5613 transport_remove_cmd_from_queue(cmd,
5951146d 5614 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5615
5616 transport_lun_remove_cmd(cmd);
5617 transport_cmd_check_stop(cmd, 1, 0);
5618 } else {
5619 spin_unlock_irqrestore(
a1d8b49a 5620 &cmd->t_state_lock, flags);
c66ac9db
NB		 5621
5622 transport_remove_cmd_from_queue(cmd,
5951146d 5623 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5624
5625 transport_lun_remove_cmd(cmd);
5626
5627 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5628 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5629 }
5630
5631 spin_lock_irqsave(&dev->execute_task_lock, flags);
5632 continue;
5633 }
5634 DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n",
5635 task, dev);
5636
a1d8b49a 5637 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5638 spin_unlock_irqrestore(
a1d8b49a 5639 &cmd->t_state_lock, flags);
c66ac9db
NB		 5640 transport_send_check_condition_and_sense(cmd,
5641 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5642 transport_remove_cmd_from_queue(cmd,
5951146d 5643 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5644
5645 transport_lun_remove_cmd(cmd);
5646 transport_cmd_check_stop(cmd, 1, 0);
5647 } else {
5648 spin_unlock_irqrestore(
a1d8b49a 5649 &cmd->t_state_lock, flags);
c66ac9db
NB		 5650
5651 transport_remove_cmd_from_queue(cmd,
5951146d 5652 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5653 transport_lun_remove_cmd(cmd);
5654
5655 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5656 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5657 }
5658
5659 spin_lock_irqsave(&dev->execute_task_lock, flags);
5660 }
5661 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5662 /*
5663 * Empty the struct se_device's struct se_cmd list.
5664 */
5951146d 5665 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
c66ac9db
NB		 5666
5667 DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n",
5951146d 5668 cmd, cmd->t_state);
c66ac9db 5669
a1d8b49a 5670 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db
NB		 5671 transport_send_check_condition_and_sense(cmd,
5672 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5673
5674 transport_lun_remove_cmd(cmd);
5675 transport_cmd_check_stop(cmd, 1, 0);
5676 } else {
5677 transport_lun_remove_cmd(cmd);
5678 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5679 transport_generic_remove(cmd, 0);
c66ac9db 5680 }
c66ac9db 5681 }
c66ac9db
NB		 5682}
5683
5684/* transport_processing_thread():
5685 *
5686 *
5687 */
5688static int transport_processing_thread(void *param)
5689{
5951146d 5690 int ret;
c66ac9db
NB		 5691 struct se_cmd *cmd;
5692 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 5693
5694 set_user_nice(current, -20);
5695
5696 while (!kthread_should_stop()) {
e3d6f909
AG		 5697 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5698 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 5699 kthread_should_stop());
5700 if (ret < 0)
5701 goto out;
5702
5703 spin_lock_irq(&dev->dev_status_lock);
5704 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5705 spin_unlock_irq(&dev->dev_status_lock);
5706 transport_processing_shutdown(dev);
5707 continue;
5708 }
5709 spin_unlock_irq(&dev->dev_status_lock);
5710
5711get_cmd:
5712 __transport_execute_tasks(dev);
5713
5951146d
AG		 5714 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5715 if (!cmd)
c66ac9db
NB		 5716 continue;
5717
5951146d 5718 switch (cmd->t_state) {
c66ac9db 5719 case TRANSPORT_NEW_CMD_MAP:
e3d6f909
AG		 5720 if (!(cmd->se_tfo->new_cmd_map)) {
5721 printk(KERN_ERR "cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 5722 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5723 BUG();
5724 }
e3d6f909 5725 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 5726 if (ret < 0) {
5727 cmd->transport_error_status = ret;
5728 transport_generic_request_failure(cmd, NULL,
5729 0, (cmd->data_direction !=
5730 DMA_TO_DEVICE));
5731 break;
5732 }
5733 /* Fall through */
5734 case TRANSPORT_NEW_CMD:
5735 ret = transport_generic_new_cmd(cmd);
5736 if (ret < 0) {
5737 cmd->transport_error_status = ret;
5738 transport_generic_request_failure(cmd, NULL,
5739 0, (cmd->data_direction !=
5740 DMA_TO_DEVICE));
5741 }
5742 break;
5743 case TRANSPORT_PROCESS_WRITE:
5744 transport_generic_process_write(cmd);
5745 break;
5746 case TRANSPORT_COMPLETE_OK:
5747 transport_stop_all_task_timers(cmd);
5748 transport_generic_complete_ok(cmd);
5749 break;
5750 case TRANSPORT_REMOVE:
35462975 5751 transport_generic_remove(cmd, 0);
c66ac9db 5752 break;
f4366772 5753 case TRANSPORT_FREE_CMD_INTR:
35462975 5754 transport_generic_free_cmd(cmd, 0, 0);
f4366772 5755 break;
c66ac9db
NB		 5756 case TRANSPORT_PROCESS_TMR:
5757 transport_generic_do_tmr(cmd);
5758 break;
5759 case TRANSPORT_COMPLETE_FAILURE:
5760 transport_generic_request_failure(cmd, NULL, 1, 1);
5761 break;
5762 case TRANSPORT_COMPLETE_TIMEOUT:
5763 transport_stop_all_task_timers(cmd);
5764 transport_generic_request_timeout(cmd);
5765 break;
5766 default:
5767 printk(KERN_ERR "Unknown t_state: %d deferred_t_state:"
5768 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 5769 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 5770 cmd->se_tfo->get_task_tag(cmd),
5771 cmd->se_tfo->get_cmd_state(cmd),
5772 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 5773 BUG();
5774 }
5775
5776 goto get_cmd;
5777 }
5778
5779out:
5780 transport_release_all_cmds(dev);
5781 dev->process_thread = NULL;
5782 return 0;
5783}
ubuntu-bionic-kernel mirror