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staging: iio: max517: Fix iio_info changes
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / target / target_core_transport.c
blob4dafeb8b56381173b733653ce0e9b1c6c9755efd
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>
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>
45 #include <scsi/scsi_tcq.h>
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
187 struct se_global *se_global;
188
189 static struct kmem_cache *se_cmd_cache;
190 static struct kmem_cache *se_sess_cache;
191 struct kmem_cache *se_tmr_req_cache;
192 struct kmem_cache *se_ua_cache;
193 struct kmem_cache *se_mem_cache;
194 struct kmem_cache *t10_pr_reg_cache;
195 struct kmem_cache *t10_alua_lu_gp_cache;
196 struct kmem_cache *t10_alua_lu_gp_mem_cache;
197 struct kmem_cache *t10_alua_tg_pt_gp_cache;
198 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
199
200 /* Used for transport_dev_get_map_*() */
201 typedef int (*map_func_t)(struct se_task *, u32);
202
203 static int transport_generic_write_pending(struct se_cmd *);
204 static int transport_processing_thread(void *);
205 static int __transport_execute_tasks(struct se_device *dev);
206 static void transport_complete_task_attr(struct se_cmd *cmd);
207 static void transport_direct_request_timeout(struct se_cmd *cmd);
208 static void transport_free_dev_tasks(struct se_cmd *cmd);
209 static u32 transport_generic_get_cdb_count(struct se_cmd *cmd,
210 unsigned long long starting_lba, u32 sectors,
211 enum dma_data_direction data_direction,
212 struct list_head *mem_list, int set_counts);
213 static int transport_generic_get_mem(struct se_cmd *cmd, u32 length,
214 u32 dma_size);
215 static int transport_generic_remove(struct se_cmd *cmd,
216 int release_to_pool, int session_reinstatement);
217 static int transport_get_sectors(struct se_cmd *cmd);
218 static struct list_head *transport_init_se_mem_list(void);
219 static int transport_map_sg_to_mem(struct se_cmd *cmd,
220 struct list_head *se_mem_list, void *in_mem,
221 u32 *se_mem_cnt);
222 static void transport_memcpy_se_mem_read_contig(struct se_cmd *cmd,
223 unsigned char *dst, struct list_head *se_mem_list);
224 static void transport_release_fe_cmd(struct se_cmd *cmd);
225 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
226 struct se_queue_obj *qobj);
227 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
228 static void transport_stop_all_task_timers(struct se_cmd *cmd);
229
230 int init_se_global(void)
231 {
232 struct se_global *global;
233
234 global = kzalloc(sizeof(struct se_global), GFP_KERNEL);
235 if (!(global)) {
236 printk(KERN_ERR "Unable to allocate memory for struct se_global\n");
237 return -1;
238 }
239
240 INIT_LIST_HEAD(&global->g_lu_gps_list);
241 INIT_LIST_HEAD(&global->g_se_tpg_list);
242 INIT_LIST_HEAD(&global->g_hba_list);
243 INIT_LIST_HEAD(&global->g_se_dev_list);
244 spin_lock_init(&global->g_device_lock);
245 spin_lock_init(&global->hba_lock);
246 spin_lock_init(&global->se_tpg_lock);
247 spin_lock_init(&global->lu_gps_lock);
248 spin_lock_init(&global->plugin_class_lock);
249
250 se_cmd_cache = kmem_cache_create("se_cmd_cache",
251 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
252 if (!(se_cmd_cache)) {
253 printk(KERN_ERR "kmem_cache_create for struct se_cmd failed\n");
254 goto out;
255 }
256 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
257 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
258 0, NULL);
259 if (!(se_tmr_req_cache)) {
260 printk(KERN_ERR "kmem_cache_create() for struct se_tmr_req"
261 " failed\n");
262 goto out;
263 }
264 se_sess_cache = kmem_cache_create("se_sess_cache",
265 sizeof(struct se_session), __alignof__(struct se_session),
266 0, NULL);
267 if (!(se_sess_cache)) {
268 printk(KERN_ERR "kmem_cache_create() for struct se_session"
269 " failed\n");
270 goto out;
271 }
272 se_ua_cache = kmem_cache_create("se_ua_cache",
273 sizeof(struct se_ua), __alignof__(struct se_ua),
274 0, NULL);
275 if (!(se_ua_cache)) {
276 printk(KERN_ERR "kmem_cache_create() for struct se_ua failed\n");
277 goto out;
278 }
279 se_mem_cache = kmem_cache_create("se_mem_cache",
280 sizeof(struct se_mem), __alignof__(struct se_mem), 0, NULL);
281 if (!(se_mem_cache)) {
282 printk(KERN_ERR "kmem_cache_create() for struct se_mem failed\n");
283 goto out;
284 }
285 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
286 sizeof(struct t10_pr_registration),
287 __alignof__(struct t10_pr_registration), 0, NULL);
288 if (!(t10_pr_reg_cache)) {
289 printk(KERN_ERR "kmem_cache_create() for struct t10_pr_registration"
290 " failed\n");
291 goto out;
292 }
293 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
294 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
295 0, NULL);
296 if (!(t10_alua_lu_gp_cache)) {
297 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_cache"
298 " failed\n");
299 goto out;
300 }
301 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
302 sizeof(struct t10_alua_lu_gp_member),
303 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
304 if (!(t10_alua_lu_gp_mem_cache)) {
305 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_mem_"
306 "cache failed\n");
307 goto out;
308 }
309 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
310 sizeof(struct t10_alua_tg_pt_gp),
311 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
312 if (!(t10_alua_tg_pt_gp_cache)) {
313 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
314 "cache failed\n");
315 goto out;
316 }
317 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
318 "t10_alua_tg_pt_gp_mem_cache",
319 sizeof(struct t10_alua_tg_pt_gp_member),
320 __alignof__(struct t10_alua_tg_pt_gp_member),
321 0, NULL);
322 if (!(t10_alua_tg_pt_gp_mem_cache)) {
323 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
324 "mem_t failed\n");
325 goto out;
326 }
327
328 se_global = global;
329
330 return 0;
331 out:
332 if (se_cmd_cache)
333 kmem_cache_destroy(se_cmd_cache);
334 if (se_tmr_req_cache)
335 kmem_cache_destroy(se_tmr_req_cache);
336 if (se_sess_cache)
337 kmem_cache_destroy(se_sess_cache);
338 if (se_ua_cache)
339 kmem_cache_destroy(se_ua_cache);
340 if (se_mem_cache)
341 kmem_cache_destroy(se_mem_cache);
342 if (t10_pr_reg_cache)
343 kmem_cache_destroy(t10_pr_reg_cache);
344 if (t10_alua_lu_gp_cache)
345 kmem_cache_destroy(t10_alua_lu_gp_cache);
346 if (t10_alua_lu_gp_mem_cache)
347 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
348 if (t10_alua_tg_pt_gp_cache)
349 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
350 if (t10_alua_tg_pt_gp_mem_cache)
351 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
352 kfree(global);
353 return -1;
354 }
355
356 void release_se_global(void)
357 {
358 struct se_global *global;
359
360 global = se_global;
361 if (!(global))
362 return;
363
364 kmem_cache_destroy(se_cmd_cache);
365 kmem_cache_destroy(se_tmr_req_cache);
366 kmem_cache_destroy(se_sess_cache);
367 kmem_cache_destroy(se_ua_cache);
368 kmem_cache_destroy(se_mem_cache);
369 kmem_cache_destroy(t10_pr_reg_cache);
370 kmem_cache_destroy(t10_alua_lu_gp_cache);
371 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
372 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
373 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
374 kfree(global);
375
376 se_global = NULL;
377 }
378
379 /* SCSI statistics table index */
380 static struct scsi_index_table scsi_index_table;
381
382 /*
383 * Initialize the index table for allocating unique row indexes to various mib
384 * tables.
385 */
386 void init_scsi_index_table(void)
387 {
388 memset(&scsi_index_table, 0, sizeof(struct scsi_index_table));
389 spin_lock_init(&scsi_index_table.lock);
390 }
391
392 /*
393 * Allocate a new row index for the entry type specified
394 */
395 u32 scsi_get_new_index(scsi_index_t type)
396 {
397 u32 new_index;
398
399 if ((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)) {
400 printk(KERN_ERR "Invalid index type %d\n", type);
401 return -EINVAL;
402 }
403
404 spin_lock(&scsi_index_table.lock);
405 new_index = ++scsi_index_table.scsi_mib_index[type];
406 if (new_index == 0)
407 new_index = ++scsi_index_table.scsi_mib_index[type];
408 spin_unlock(&scsi_index_table.lock);
409
410 return new_index;
411 }
412
413 void transport_init_queue_obj(struct se_queue_obj *qobj)
414 {
415 atomic_set(&qobj->queue_cnt, 0);
416 INIT_LIST_HEAD(&qobj->qobj_list);
417 init_waitqueue_head(&qobj->thread_wq);
418 spin_lock_init(&qobj->cmd_queue_lock);
419 }
420 EXPORT_SYMBOL(transport_init_queue_obj);
421
422 static int transport_subsystem_reqmods(void)
423 {
424 int ret;
425
426 ret = request_module("target_core_iblock");
427 if (ret != 0)
428 printk(KERN_ERR "Unable to load target_core_iblock\n");
429
430 ret = request_module("target_core_file");
431 if (ret != 0)
432 printk(KERN_ERR "Unable to load target_core_file\n");
433
434 ret = request_module("target_core_pscsi");
435 if (ret != 0)
436 printk(KERN_ERR "Unable to load target_core_pscsi\n");
437
438 ret = request_module("target_core_stgt");
439 if (ret != 0)
440 printk(KERN_ERR "Unable to load target_core_stgt\n");
441
442 return 0;
443 }
444
445 int transport_subsystem_check_init(void)
446 {
447 if (se_global->g_sub_api_initialized)
448 return 0;
449 /*
450 * Request the loading of known TCM subsystem plugins..
451 */
452 if (transport_subsystem_reqmods() < 0)
453 return -1;
454
455 se_global->g_sub_api_initialized = 1;
456 return 0;
457 }
458
459 struct se_session *transport_init_session(void)
460 {
461 struct se_session *se_sess;
462
463 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
464 if (!(se_sess)) {
465 printk(KERN_ERR "Unable to allocate struct se_session from"
466 " se_sess_cache\n");
467 return ERR_PTR(-ENOMEM);
468 }
469 INIT_LIST_HEAD(&se_sess->sess_list);
470 INIT_LIST_HEAD(&se_sess->sess_acl_list);
471
472 return se_sess;
473 }
474 EXPORT_SYMBOL(transport_init_session);
475
476 /*
477 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
478 */
479 void __transport_register_session(
480 struct se_portal_group *se_tpg,
481 struct se_node_acl *se_nacl,
482 struct se_session *se_sess,
483 void *fabric_sess_ptr)
484 {
485 unsigned char buf[PR_REG_ISID_LEN];
486
487 se_sess->se_tpg = se_tpg;
488 se_sess->fabric_sess_ptr = fabric_sess_ptr;
489 /*
490 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
491 *
492 * Only set for struct se_session's that will actually be moving I/O.
493 * eg: *NOT* discovery sessions.
494 */
495 if (se_nacl) {
496 /*
497 * If the fabric module supports an ISID based TransportID,
498 * save this value in binary from the fabric I_T Nexus now.
499 */
500 if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) {
501 memset(&buf[0], 0, PR_REG_ISID_LEN);
502 TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess,
503 &buf[0], PR_REG_ISID_LEN);
504 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
505 }
506 spin_lock_irq(&se_nacl->nacl_sess_lock);
507 /*
508 * The se_nacl->nacl_sess pointer will be set to the
509 * last active I_T Nexus for each struct se_node_acl.
510 */
511 se_nacl->nacl_sess = se_sess;
512
513 list_add_tail(&se_sess->sess_acl_list,
514 &se_nacl->acl_sess_list);
515 spin_unlock_irq(&se_nacl->nacl_sess_lock);
516 }
517 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
518
519 printk(KERN_INFO "TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
520 TPG_TFO(se_tpg)->get_fabric_name(), se_sess->fabric_sess_ptr);
521 }
522 EXPORT_SYMBOL(__transport_register_session);
523
524 void transport_register_session(
525 struct se_portal_group *se_tpg,
526 struct se_node_acl *se_nacl,
527 struct se_session *se_sess,
528 void *fabric_sess_ptr)
529 {
530 spin_lock_bh(&se_tpg->session_lock);
531 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
532 spin_unlock_bh(&se_tpg->session_lock);
533 }
534 EXPORT_SYMBOL(transport_register_session);
535
536 void transport_deregister_session_configfs(struct se_session *se_sess)
537 {
538 struct se_node_acl *se_nacl;
539
540 /*
541 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
542 */
543 se_nacl = se_sess->se_node_acl;
544 if ((se_nacl)) {
545 spin_lock_irq(&se_nacl->nacl_sess_lock);
546 list_del(&se_sess->sess_acl_list);
547 /*
548 * If the session list is empty, then clear the pointer.
549 * Otherwise, set the struct se_session pointer from the tail
550 * element of the per struct se_node_acl active session list.
551 */
552 if (list_empty(&se_nacl->acl_sess_list))
553 se_nacl->nacl_sess = NULL;
554 else {
555 se_nacl->nacl_sess = container_of(
556 se_nacl->acl_sess_list.prev,
557 struct se_session, sess_acl_list);
558 }
559 spin_unlock_irq(&se_nacl->nacl_sess_lock);
560 }
561 }
562 EXPORT_SYMBOL(transport_deregister_session_configfs);
563
564 void transport_free_session(struct se_session *se_sess)
565 {
566 kmem_cache_free(se_sess_cache, se_sess);
567 }
568 EXPORT_SYMBOL(transport_free_session);
569
570 void transport_deregister_session(struct se_session *se_sess)
571 {
572 struct se_portal_group *se_tpg = se_sess->se_tpg;
573 struct se_node_acl *se_nacl;
574
575 if (!(se_tpg)) {
576 transport_free_session(se_sess);
577 return;
578 }
579
580 spin_lock_bh(&se_tpg->session_lock);
581 list_del(&se_sess->sess_list);
582 se_sess->se_tpg = NULL;
583 se_sess->fabric_sess_ptr = NULL;
584 spin_unlock_bh(&se_tpg->session_lock);
585
586 /*
587 * Determine if we need to do extra work for this initiator node's
588 * struct se_node_acl if it had been previously dynamically generated.
589 */
590 se_nacl = se_sess->se_node_acl;
591 if ((se_nacl)) {
592 spin_lock_bh(&se_tpg->acl_node_lock);
593 if (se_nacl->dynamic_node_acl) {
594 if (!(TPG_TFO(se_tpg)->tpg_check_demo_mode_cache(
595 se_tpg))) {
596 list_del(&se_nacl->acl_list);
597 se_tpg->num_node_acls--;
598 spin_unlock_bh(&se_tpg->acl_node_lock);
599
600 core_tpg_wait_for_nacl_pr_ref(se_nacl);
601 core_free_device_list_for_node(se_nacl, se_tpg);
602 TPG_TFO(se_tpg)->tpg_release_fabric_acl(se_tpg,
603 se_nacl);
604 spin_lock_bh(&se_tpg->acl_node_lock);
605 }
606 }
607 spin_unlock_bh(&se_tpg->acl_node_lock);
608 }
609
610 transport_free_session(se_sess);
611
612 printk(KERN_INFO "TARGET_CORE[%s]: Deregistered fabric_sess\n",
613 TPG_TFO(se_tpg)->get_fabric_name());
614 }
615 EXPORT_SYMBOL(transport_deregister_session);
616
617 /*
618 * Called with T_TASK(cmd)->t_state_lock held.
619 */
620 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
621 {
622 struct se_device *dev;
623 struct se_task *task;
624 unsigned long flags;
625
626 if (!T_TASK(cmd))
627 return;
628
629 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
630 dev = task->se_dev;
631 if (!(dev))
632 continue;
633
634 if (atomic_read(&task->task_active))
635 continue;
636
637 if (!(atomic_read(&task->task_state_active)))
638 continue;
639
640 spin_lock_irqsave(&dev->execute_task_lock, flags);
641 list_del(&task->t_state_list);
642 DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n",
643 CMD_TFO(cmd)->tfo_get_task_tag(cmd), dev, task);
644 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
645
646 atomic_set(&task->task_state_active, 0);
647 atomic_dec(&T_TASK(cmd)->t_task_cdbs_ex_left);
648 }
649 }
650
651 /* transport_cmd_check_stop():
652 *
653 * 'transport_off = 1' determines if t_transport_active should be cleared.
654 * 'transport_off = 2' determines if task_dev_state should be removed.
655 *
656 * A non-zero u8 t_state sets cmd->t_state.
657 * Returns 1 when command is stopped, else 0.
658 */
659 static int transport_cmd_check_stop(
660 struct se_cmd *cmd,
661 int transport_off,
662 u8 t_state)
663 {
664 unsigned long flags;
665
666 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
667 /*
668 * Determine if IOCTL context caller in requesting the stopping of this
669 * command for LUN shutdown purposes.
670 */
671 if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) {
672 DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->transport_lun_stop)"
673 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
674 CMD_TFO(cmd)->get_task_tag(cmd));
675
676 cmd->deferred_t_state = cmd->t_state;
677 cmd->t_state = TRANSPORT_DEFERRED_CMD;
678 atomic_set(&T_TASK(cmd)->t_transport_active, 0);
679 if (transport_off == 2)
680 transport_all_task_dev_remove_state(cmd);
681 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
682
683 complete(&T_TASK(cmd)->transport_lun_stop_comp);
684 return 1;
685 }
686 /*
687 * Determine if frontend context caller is requesting the stopping of
688 * this command for frontend excpections.
689 */
690 if (atomic_read(&T_TASK(cmd)->t_transport_stop)) {
691 DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->t_transport_stop) =="
692 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
693 CMD_TFO(cmd)->get_task_tag(cmd));
694
695 cmd->deferred_t_state = cmd->t_state;
696 cmd->t_state = TRANSPORT_DEFERRED_CMD;
697 if (transport_off == 2)
698 transport_all_task_dev_remove_state(cmd);
699
700 /*
701 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
702 * to FE.
703 */
704 if (transport_off == 2)
705 cmd->se_lun = NULL;
706 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
707
708 complete(&T_TASK(cmd)->t_transport_stop_comp);
709 return 1;
710 }
711 if (transport_off) {
712 atomic_set(&T_TASK(cmd)->t_transport_active, 0);
713 if (transport_off == 2) {
714 transport_all_task_dev_remove_state(cmd);
715 /*
716 * Clear struct se_cmd->se_lun before the transport_off == 2
717 * handoff to fabric module.
718 */
719 cmd->se_lun = NULL;
720 /*
721 * Some fabric modules like tcm_loop can release
722 * their internally allocated I/O reference now and
723 * struct se_cmd now.
724 */
725 if (CMD_TFO(cmd)->check_stop_free != NULL) {
726 spin_unlock_irqrestore(
727 &T_TASK(cmd)->t_state_lock, flags);
728
729 CMD_TFO(cmd)->check_stop_free(cmd);
730 return 1;
731 }
732 }
733 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
734
735 return 0;
736 } else if (t_state)
737 cmd->t_state = t_state;
738 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
739
740 return 0;
741 }
742
743 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
744 {
745 return transport_cmd_check_stop(cmd, 2, 0);
746 }
747
748 static void transport_lun_remove_cmd(struct se_cmd *cmd)
749 {
750 struct se_lun *lun = SE_LUN(cmd);
751 unsigned long flags;
752
753 if (!lun)
754 return;
755
756 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
757 if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
758 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
759 goto check_lun;
760 }
761 atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
762 transport_all_task_dev_remove_state(cmd);
763 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
764
765
766 check_lun:
767 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
768 if (atomic_read(&T_TASK(cmd)->transport_lun_active)) {
769 list_del(&cmd->se_lun_list);
770 atomic_set(&T_TASK(cmd)->transport_lun_active, 0);
771 #if 0
772 printk(KERN_INFO "Removed ITT: 0x%08x from LUN LIST[%d]\n"
773 CMD_TFO(cmd)->get_task_tag(cmd), lun->unpacked_lun);
774 #endif
775 }
776 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
777 }
778
779 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
780 {
781 transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
782 transport_lun_remove_cmd(cmd);
783
784 if (transport_cmd_check_stop_to_fabric(cmd))
785 return;
786 if (remove)
787 transport_generic_remove(cmd, 0, 0);
788 }
789
790 void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
791 {
792 transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
793
794 if (transport_cmd_check_stop_to_fabric(cmd))
795 return;
796
797 transport_generic_remove(cmd, 0, 0);
798 }
799
800 static int transport_add_cmd_to_queue(
801 struct se_cmd *cmd,
802 int t_state)
803 {
804 struct se_device *dev = cmd->se_dev;
805 struct se_queue_obj *qobj = dev->dev_queue_obj;
806 struct se_queue_req *qr;
807 unsigned long flags;
808
809 qr = kzalloc(sizeof(struct se_queue_req), GFP_ATOMIC);
810 if (!(qr)) {
811 printk(KERN_ERR "Unable to allocate memory for"
812 " struct se_queue_req\n");
813 return -1;
814 }
815 INIT_LIST_HEAD(&qr->qr_list);
816
817 qr->cmd = (void *)cmd;
818 qr->state = t_state;
819
820 if (t_state) {
821 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
822 cmd->t_state = t_state;
823 atomic_set(&T_TASK(cmd)->t_transport_active, 1);
824 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
825 }
826
827 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
828 list_add_tail(&qr->qr_list, &qobj->qobj_list);
829 atomic_inc(&T_TASK(cmd)->t_transport_queue_active);
830 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
831
832 atomic_inc(&qobj->queue_cnt);
833 wake_up_interruptible(&qobj->thread_wq);
834 return 0;
835 }
836
837 /*
838 * Called with struct se_queue_obj->cmd_queue_lock held.
839 */
840 static struct se_queue_req *
841 __transport_get_qr_from_queue(struct se_queue_obj *qobj)
842 {
843 struct se_cmd *cmd;
844 struct se_queue_req *qr = NULL;
845
846 if (list_empty(&qobj->qobj_list))
847 return NULL;
848
849 list_for_each_entry(qr, &qobj->qobj_list, qr_list)
850 break;
851
852 if (qr->cmd) {
853 cmd = (struct se_cmd *)qr->cmd;
854 atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
855 }
856 list_del(&qr->qr_list);
857 atomic_dec(&qobj->queue_cnt);
858
859 return qr;
860 }
861
862 static struct se_queue_req *
863 transport_get_qr_from_queue(struct se_queue_obj *qobj)
864 {
865 struct se_cmd *cmd;
866 struct se_queue_req *qr;
867 unsigned long flags;
868
869 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
870 if (list_empty(&qobj->qobj_list)) {
871 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
872 return NULL;
873 }
874
875 list_for_each_entry(qr, &qobj->qobj_list, qr_list)
876 break;
877
878 if (qr->cmd) {
879 cmd = (struct se_cmd *)qr->cmd;
880 atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
881 }
882 list_del(&qr->qr_list);
883 atomic_dec(&qobj->queue_cnt);
884 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
885
886 return qr;
887 }
888
889 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
890 struct se_queue_obj *qobj)
891 {
892 struct se_cmd *q_cmd;
893 struct se_queue_req *qr = NULL, *qr_p = NULL;
894 unsigned long flags;
895
896 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
897 if (!(atomic_read(&T_TASK(cmd)->t_transport_queue_active))) {
898 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
899 return;
900 }
901
902 list_for_each_entry_safe(qr, qr_p, &qobj->qobj_list, qr_list) {
903 q_cmd = (struct se_cmd *)qr->cmd;
904 if (q_cmd != cmd)
905 continue;
906
907 atomic_dec(&T_TASK(q_cmd)->t_transport_queue_active);
908 atomic_dec(&qobj->queue_cnt);
909 list_del(&qr->qr_list);
910 kfree(qr);
911 }
912 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
913
914 if (atomic_read(&T_TASK(cmd)->t_transport_queue_active)) {
915 printk(KERN_ERR "ITT: 0x%08x t_transport_queue_active: %d\n",
916 CMD_TFO(cmd)->get_task_tag(cmd),
917 atomic_read(&T_TASK(cmd)->t_transport_queue_active));
918 }
919 }
920
921 /*
922 * Completion function used by TCM subsystem plugins (such as FILEIO)
923 * for queueing up response from struct se_subsystem_api->do_task()
924 */
925 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
926 {
927 struct se_task *task = list_entry(T_TASK(cmd)->t_task_list.next,
928 struct se_task, t_list);
929
930 if (good) {
931 cmd->scsi_status = SAM_STAT_GOOD;
932 task->task_scsi_status = GOOD;
933 } else {
934 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
935 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
936 TASK_CMD(task)->transport_error_status =
937 PYX_TRANSPORT_ILLEGAL_REQUEST;
938 }
939
940 transport_complete_task(task, good);
941 }
942 EXPORT_SYMBOL(transport_complete_sync_cache);
943
944 /* transport_complete_task():
945 *
946 * Called from interrupt and non interrupt context depending
947 * on the transport plugin.
948 */
949 void transport_complete_task(struct se_task *task, int success)
950 {
951 struct se_cmd *cmd = TASK_CMD(task);
952 struct se_device *dev = task->se_dev;
953 int t_state;
954 unsigned long flags;
955 #if 0
956 printk(KERN_INFO "task: %p CDB: 0x%02x obj_ptr: %p\n", task,
957 T_TASK(cmd)->t_task_cdb[0], dev);
958 #endif
959 if (dev) {
960 spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);
961 atomic_inc(&dev->depth_left);
962 atomic_inc(&SE_HBA(dev)->left_queue_depth);
963 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
964 }
965
966 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
967 atomic_set(&task->task_active, 0);
968
969 /*
970 * See if any sense data exists, if so set the TASK_SENSE flag.
971 * Also check for any other post completion work that needs to be
972 * done by the plugins.
973 */
974 if (dev && dev->transport->transport_complete) {
975 if (dev->transport->transport_complete(task) != 0) {
976 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
977 task->task_sense = 1;
978 success = 1;
979 }
980 }
981
982 /*
983 * See if we are waiting for outstanding struct se_task
984 * to complete for an exception condition
985 */
986 if (atomic_read(&task->task_stop)) {
987 /*
988 * Decrement T_TASK(cmd)->t_se_count if this task had
989 * previously thrown its timeout exception handler.
990 */
991 if (atomic_read(&task->task_timeout)) {
992 atomic_dec(&T_TASK(cmd)->t_se_count);
993 atomic_set(&task->task_timeout, 0);
994 }
995 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
996
997 complete(&task->task_stop_comp);
998 return;
999 }
1000 /*
1001 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
1002 * left counter to determine when the struct se_cmd is ready to be queued to
1003 * the processing thread.
1004 */
1005 if (atomic_read(&task->task_timeout)) {
1006 if (!(atomic_dec_and_test(
1007 &T_TASK(cmd)->t_task_cdbs_timeout_left))) {
1008 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
1009 flags);
1010 return;
1011 }
1012 t_state = TRANSPORT_COMPLETE_TIMEOUT;
1013 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1014
1015 transport_add_cmd_to_queue(cmd, t_state);
1016 return;
1017 }
1018 atomic_dec(&T_TASK(cmd)->t_task_cdbs_timeout_left);
1019
1020 /*
1021 * Decrement the outstanding t_task_cdbs_left count. The last
1022 * struct se_task from struct se_cmd will complete itself into the
1023 * device queue depending upon int success.
1024 */
1025 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) {
1026 if (!success)
1027 T_TASK(cmd)->t_tasks_failed = 1;
1028
1029 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1030 return;
1031 }
1032
1033 if (!success || T_TASK(cmd)->t_tasks_failed) {
1034 t_state = TRANSPORT_COMPLETE_FAILURE;
1035 if (!task->task_error_status) {
1036 task->task_error_status =
1037 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1038 cmd->transport_error_status =
1039 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1040 }
1041 } else {
1042 atomic_set(&T_TASK(cmd)->t_transport_complete, 1);
1043 t_state = TRANSPORT_COMPLETE_OK;
1044 }
1045 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1046
1047 transport_add_cmd_to_queue(cmd, t_state);
1048 }
1049 EXPORT_SYMBOL(transport_complete_task);
1050
1051 /*
1052 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
1053 * struct se_task list are ready to be added to the active execution list
1054 * struct se_device
1055
1056 * Called with se_dev_t->execute_task_lock called.
1057 */
1058 static inline int transport_add_task_check_sam_attr(
1059 struct se_task *task,
1060 struct se_task *task_prev,
1061 struct se_device *dev)
1062 {
1063 /*
1064 * No SAM Task attribute emulation enabled, add to tail of
1065 * execution queue
1066 */
1067 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
1068 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
1069 return 0;
1070 }
1071 /*
1072 * HEAD_OF_QUEUE attribute for received CDB, which means
1073 * the first task that is associated with a struct se_cmd goes to
1074 * head of the struct se_device->execute_task_list, and task_prev
1075 * after that for each subsequent task
1076 */
1077 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
1078 list_add(&task->t_execute_list,
1079 (task_prev != NULL) ?
1080 &task_prev->t_execute_list :
1081 &dev->execute_task_list);
1082
1083 DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
1084 " in execution queue\n",
1085 T_TASK(task->task_se_cmd)->t_task_cdb[0]);
1086 return 1;
1087 }
1088 /*
1089 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
1090 * transitioned from Dermant -> Active state, and are added to the end
1091 * of the struct se_device->execute_task_list
1092 */
1093 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
1094 return 0;
1095 }
1096
1097 /* __transport_add_task_to_execute_queue():
1098 *
1099 * Called with se_dev_t->execute_task_lock called.
1100 */
1101 static void __transport_add_task_to_execute_queue(
1102 struct se_task *task,
1103 struct se_task *task_prev,
1104 struct se_device *dev)
1105 {
1106 int head_of_queue;
1107
1108 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
1109 atomic_inc(&dev->execute_tasks);
1110
1111 if (atomic_read(&task->task_state_active))
1112 return;
1113 /*
1114 * Determine if this task needs to go to HEAD_OF_QUEUE for the
1115 * state list as well. Running with SAM Task Attribute emulation
1116 * will always return head_of_queue == 0 here
1117 */
1118 if (head_of_queue)
1119 list_add(&task->t_state_list, (task_prev) ?
1120 &task_prev->t_state_list :
1121 &dev->state_task_list);
1122 else
1123 list_add_tail(&task->t_state_list, &dev->state_task_list);
1124
1125 atomic_set(&task->task_state_active, 1);
1126
1127 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1128 CMD_TFO(task->task_se_cmd)->get_task_tag(task->task_se_cmd),
1129 task, dev);
1130 }
1131
1132 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
1133 {
1134 struct se_device *dev;
1135 struct se_task *task;
1136 unsigned long flags;
1137
1138 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
1139 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
1140 dev = task->se_dev;
1141
1142 if (atomic_read(&task->task_state_active))
1143 continue;
1144
1145 spin_lock(&dev->execute_task_lock);
1146 list_add_tail(&task->t_state_list, &dev->state_task_list);
1147 atomic_set(&task->task_state_active, 1);
1148
1149 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1150 CMD_TFO(task->task_se_cmd)->get_task_tag(
1151 task->task_se_cmd), task, dev);
1152
1153 spin_unlock(&dev->execute_task_lock);
1154 }
1155 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1156 }
1157
1158 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
1159 {
1160 struct se_device *dev = SE_DEV(cmd);
1161 struct se_task *task, *task_prev = NULL;
1162 unsigned long flags;
1163
1164 spin_lock_irqsave(&dev->execute_task_lock, flags);
1165 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
1166 if (atomic_read(&task->task_execute_queue))
1167 continue;
1168 /*
1169 * __transport_add_task_to_execute_queue() handles the
1170 * SAM Task Attribute emulation if enabled
1171 */
1172 __transport_add_task_to_execute_queue(task, task_prev, dev);
1173 atomic_set(&task->task_execute_queue, 1);
1174 task_prev = task;
1175 }
1176 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
1177
1178 return;
1179 }
1180
1181 /* transport_get_task_from_execute_queue():
1182 *
1183 * Called with dev->execute_task_lock held.
1184 */
1185 static struct se_task *
1186 transport_get_task_from_execute_queue(struct se_device *dev)
1187 {
1188 struct se_task *task;
1189
1190 if (list_empty(&dev->execute_task_list))
1191 return NULL;
1192
1193 list_for_each_entry(task, &dev->execute_task_list, t_execute_list)
1194 break;
1195
1196 list_del(&task->t_execute_list);
1197 atomic_set(&task->task_execute_queue, 0);
1198 atomic_dec(&dev->execute_tasks);
1199
1200 return task;
1201 }
1202
1203 /* transport_remove_task_from_execute_queue():
1204 *
1205 *
1206 */
1207 void transport_remove_task_from_execute_queue(
1208 struct se_task *task,
1209 struct se_device *dev)
1210 {
1211 unsigned long flags;
1212
1213 if (atomic_read(&task->task_execute_queue) == 0) {
1214 dump_stack();
1215 return;
1216 }
1217
1218 spin_lock_irqsave(&dev->execute_task_lock, flags);
1219 list_del(&task->t_execute_list);
1220 atomic_set(&task->task_execute_queue, 0);
1221 atomic_dec(&dev->execute_tasks);
1222 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
1223 }
1224
1225 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1226 {
1227 switch (cmd->data_direction) {
1228 case DMA_NONE:
1229 return "NONE";
1230 case DMA_FROM_DEVICE:
1231 return "READ";
1232 case DMA_TO_DEVICE:
1233 return "WRITE";
1234 case DMA_BIDIRECTIONAL:
1235 return "BIDI";
1236 default:
1237 break;
1238 }
1239
1240 return "UNKNOWN";
1241 }
1242
1243 void transport_dump_dev_state(
1244 struct se_device *dev,
1245 char *b,
1246 int *bl)
1247 {
1248 *bl += sprintf(b + *bl, "Status: ");
1249 switch (dev->dev_status) {
1250 case TRANSPORT_DEVICE_ACTIVATED:
1251 *bl += sprintf(b + *bl, "ACTIVATED");
1252 break;
1253 case TRANSPORT_DEVICE_DEACTIVATED:
1254 *bl += sprintf(b + *bl, "DEACTIVATED");
1255 break;
1256 case TRANSPORT_DEVICE_SHUTDOWN:
1257 *bl += sprintf(b + *bl, "SHUTDOWN");
1258 break;
1259 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1260 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1261 *bl += sprintf(b + *bl, "OFFLINE");
1262 break;
1263 default:
1264 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1265 break;
1266 }
1267
1268 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1269 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1270 dev->queue_depth);
1271 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
1272 DEV_ATTRIB(dev)->block_size, DEV_ATTRIB(dev)->max_sectors);
1273 *bl += sprintf(b + *bl, " ");
1274 }
1275
1276 /* transport_release_all_cmds():
1277 *
1278 *
1279 */
1280 static void transport_release_all_cmds(struct se_device *dev)
1281 {
1282 struct se_cmd *cmd = NULL;
1283 struct se_queue_req *qr = NULL, *qr_p = NULL;
1284 int bug_out = 0, t_state;
1285 unsigned long flags;
1286
1287 spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
1288 list_for_each_entry_safe(qr, qr_p, &dev->dev_queue_obj->qobj_list,
1289 qr_list) {
1290
1291 cmd = (struct se_cmd *)qr->cmd;
1292 t_state = qr->state;
1293 list_del(&qr->qr_list);
1294 kfree(qr);
1295 spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock,
1296 flags);
1297
1298 printk(KERN_ERR "Releasing ITT: 0x%08x, i_state: %u,"
1299 " t_state: %u directly\n",
1300 CMD_TFO(cmd)->get_task_tag(cmd),
1301 CMD_TFO(cmd)->get_cmd_state(cmd), t_state);
1302
1303 transport_release_fe_cmd(cmd);
1304 bug_out = 1;
1305
1306 spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
1307 }
1308 spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags);
1309 #if 0
1310 if (bug_out)
1311 BUG();
1312 #endif
1313 }
1314
1315 void transport_dump_vpd_proto_id(
1316 struct t10_vpd *vpd,
1317 unsigned char *p_buf,
1318 int p_buf_len)
1319 {
1320 unsigned char buf[VPD_TMP_BUF_SIZE];
1321 int len;
1322
1323 memset(buf, 0, VPD_TMP_BUF_SIZE);
1324 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1325
1326 switch (vpd->protocol_identifier) {
1327 case 0x00:
1328 sprintf(buf+len, "Fibre Channel\n");
1329 break;
1330 case 0x10:
1331 sprintf(buf+len, "Parallel SCSI\n");
1332 break;
1333 case 0x20:
1334 sprintf(buf+len, "SSA\n");
1335 break;
1336 case 0x30:
1337 sprintf(buf+len, "IEEE 1394\n");
1338 break;
1339 case 0x40:
1340 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1341 " Protocol\n");
1342 break;
1343 case 0x50:
1344 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1345 break;
1346 case 0x60:
1347 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1348 break;
1349 case 0x70:
1350 sprintf(buf+len, "Automation/Drive Interface Transport"
1351 " Protocol\n");
1352 break;
1353 case 0x80:
1354 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1355 break;
1356 default:
1357 sprintf(buf+len, "Unknown 0x%02x\n",
1358 vpd->protocol_identifier);
1359 break;
1360 }
1361
1362 if (p_buf)
1363 strncpy(p_buf, buf, p_buf_len);
1364 else
1365 printk(KERN_INFO "%s", buf);
1366 }
1367
1368 void
1369 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1370 {
1371 /*
1372 * Check if the Protocol Identifier Valid (PIV) bit is set..
1373 *
1374 * from spc3r23.pdf section 7.5.1
1375 */
1376 if (page_83[1] & 0x80) {
1377 vpd->protocol_identifier = (page_83[0] & 0xf0);
1378 vpd->protocol_identifier_set = 1;
1379 transport_dump_vpd_proto_id(vpd, NULL, 0);
1380 }
1381 }
1382 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1383
1384 int transport_dump_vpd_assoc(
1385 struct t10_vpd *vpd,
1386 unsigned char *p_buf,
1387 int p_buf_len)
1388 {
1389 unsigned char buf[VPD_TMP_BUF_SIZE];
1390 int ret = 0, len;
1391
1392 memset(buf, 0, VPD_TMP_BUF_SIZE);
1393 len = sprintf(buf, "T10 VPD Identifier Association: ");
1394
1395 switch (vpd->association) {
1396 case 0x00:
1397 sprintf(buf+len, "addressed logical unit\n");
1398 break;
1399 case 0x10:
1400 sprintf(buf+len, "target port\n");
1401 break;
1402 case 0x20:
1403 sprintf(buf+len, "SCSI target device\n");
1404 break;
1405 default:
1406 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1407 ret = -1;
1408 break;
1409 }
1410
1411 if (p_buf)
1412 strncpy(p_buf, buf, p_buf_len);
1413 else
1414 printk("%s", buf);
1415
1416 return ret;
1417 }
1418
1419 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1420 {
1421 /*
1422 * The VPD identification association..
1423 *
1424 * from spc3r23.pdf Section 7.6.3.1 Table 297
1425 */
1426 vpd->association = (page_83[1] & 0x30);
1427 return transport_dump_vpd_assoc(vpd, NULL, 0);
1428 }
1429 EXPORT_SYMBOL(transport_set_vpd_assoc);
1430
1431 int transport_dump_vpd_ident_type(
1432 struct t10_vpd *vpd,
1433 unsigned char *p_buf,
1434 int p_buf_len)
1435 {
1436 unsigned char buf[VPD_TMP_BUF_SIZE];
1437 int ret = 0, len;
1438
1439 memset(buf, 0, VPD_TMP_BUF_SIZE);
1440 len = sprintf(buf, "T10 VPD Identifier Type: ");
1441
1442 switch (vpd->device_identifier_type) {
1443 case 0x00:
1444 sprintf(buf+len, "Vendor specific\n");
1445 break;
1446 case 0x01:
1447 sprintf(buf+len, "T10 Vendor ID based\n");
1448 break;
1449 case 0x02:
1450 sprintf(buf+len, "EUI-64 based\n");
1451 break;
1452 case 0x03:
1453 sprintf(buf+len, "NAA\n");
1454 break;
1455 case 0x04:
1456 sprintf(buf+len, "Relative target port identifier\n");
1457 break;
1458 case 0x08:
1459 sprintf(buf+len, "SCSI name string\n");
1460 break;
1461 default:
1462 sprintf(buf+len, "Unsupported: 0x%02x\n",
1463 vpd->device_identifier_type);
1464 ret = -1;
1465 break;
1466 }
1467
1468 if (p_buf)
1469 strncpy(p_buf, buf, p_buf_len);
1470 else
1471 printk("%s", buf);
1472
1473 return ret;
1474 }
1475
1476 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1477 {
1478 /*
1479 * The VPD identifier type..
1480 *
1481 * from spc3r23.pdf Section 7.6.3.1 Table 298
1482 */
1483 vpd->device_identifier_type = (page_83[1] & 0x0f);
1484 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1485 }
1486 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1487
1488 int transport_dump_vpd_ident(
1489 struct t10_vpd *vpd,
1490 unsigned char *p_buf,
1491 int p_buf_len)
1492 {
1493 unsigned char buf[VPD_TMP_BUF_SIZE];
1494 int ret = 0;
1495
1496 memset(buf, 0, VPD_TMP_BUF_SIZE);
1497
1498 switch (vpd->device_identifier_code_set) {
1499 case 0x01: /* Binary */
1500 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1501 &vpd->device_identifier[0]);
1502 break;
1503 case 0x02: /* ASCII */
1504 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1505 &vpd->device_identifier[0]);
1506 break;
1507 case 0x03: /* UTF-8 */
1508 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1509 &vpd->device_identifier[0]);
1510 break;
1511 default:
1512 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1513 " 0x%02x", vpd->device_identifier_code_set);
1514 ret = -1;
1515 break;
1516 }
1517
1518 if (p_buf)
1519 strncpy(p_buf, buf, p_buf_len);
1520 else
1521 printk("%s", buf);
1522
1523 return ret;
1524 }
1525
1526 int
1527 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1528 {
1529 static const char hex_str[] = "0123456789abcdef";
1530 int j = 0, i = 4; /* offset to start of the identifer */
1531
1532 /*
1533 * The VPD Code Set (encoding)
1534 *
1535 * from spc3r23.pdf Section 7.6.3.1 Table 296
1536 */
1537 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1538 switch (vpd->device_identifier_code_set) {
1539 case 0x01: /* Binary */
1540 vpd->device_identifier[j++] =
1541 hex_str[vpd->device_identifier_type];
1542 while (i < (4 + page_83[3])) {
1543 vpd->device_identifier[j++] =
1544 hex_str[(page_83[i] & 0xf0) >> 4];
1545 vpd->device_identifier[j++] =
1546 hex_str[page_83[i] & 0x0f];
1547 i++;
1548 }
1549 break;
1550 case 0x02: /* ASCII */
1551 case 0x03: /* UTF-8 */
1552 while (i < (4 + page_83[3]))
1553 vpd->device_identifier[j++] = page_83[i++];
1554 break;
1555 default:
1556 break;
1557 }
1558
1559 return transport_dump_vpd_ident(vpd, NULL, 0);
1560 }
1561 EXPORT_SYMBOL(transport_set_vpd_ident);
1562
1563 static void core_setup_task_attr_emulation(struct se_device *dev)
1564 {
1565 /*
1566 * If this device is from Target_Core_Mod/pSCSI, disable the
1567 * SAM Task Attribute emulation.
1568 *
1569 * This is currently not available in upsream Linux/SCSI Target
1570 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1571 */
1572 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1573 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1574 return;
1575 }
1576
1577 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1578 DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1579 " device\n", TRANSPORT(dev)->name,
1580 TRANSPORT(dev)->get_device_rev(dev));
1581 }
1582
1583 static void scsi_dump_inquiry(struct se_device *dev)
1584 {
1585 struct t10_wwn *wwn = DEV_T10_WWN(dev);
1586 int i, device_type;
1587 /*
1588 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1589 */
1590 printk(" Vendor: ");
1591 for (i = 0; i < 8; i++)
1592 if (wwn->vendor[i] >= 0x20)
1593 printk("%c", wwn->vendor[i]);
1594 else
1595 printk(" ");
1596
1597 printk(" Model: ");
1598 for (i = 0; i < 16; i++)
1599 if (wwn->model[i] >= 0x20)
1600 printk("%c", wwn->model[i]);
1601 else
1602 printk(" ");
1603
1604 printk(" Revision: ");
1605 for (i = 0; i < 4; i++)
1606 if (wwn->revision[i] >= 0x20)
1607 printk("%c", wwn->revision[i]);
1608 else
1609 printk(" ");
1610
1611 printk("\n");
1612
1613 device_type = TRANSPORT(dev)->get_device_type(dev);
1614 printk(" Type: %s ", scsi_device_type(device_type));
1615 printk(" ANSI SCSI revision: %02x\n",
1616 TRANSPORT(dev)->get_device_rev(dev));
1617 }
1618
1619 struct se_device *transport_add_device_to_core_hba(
1620 struct se_hba *hba,
1621 struct se_subsystem_api *transport,
1622 struct se_subsystem_dev *se_dev,
1623 u32 device_flags,
1624 void *transport_dev,
1625 struct se_dev_limits *dev_limits,
1626 const char *inquiry_prod,
1627 const char *inquiry_rev)
1628 {
1629 int force_pt;
1630 struct se_device *dev;
1631
1632 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1633 if (!(dev)) {
1634 printk(KERN_ERR "Unable to allocate memory for se_dev_t\n");
1635 return NULL;
1636 }
1637 dev->dev_queue_obj = kzalloc(sizeof(struct se_queue_obj), GFP_KERNEL);
1638 if (!(dev->dev_queue_obj)) {
1639 printk(KERN_ERR "Unable to allocate memory for"
1640 " dev->dev_queue_obj\n");
1641 kfree(dev);
1642 return NULL;
1643 }
1644 transport_init_queue_obj(dev->dev_queue_obj);
1645
1646 dev->dev_status_queue_obj = kzalloc(sizeof(struct se_queue_obj),
1647 GFP_KERNEL);
1648 if (!(dev->dev_status_queue_obj)) {
1649 printk(KERN_ERR "Unable to allocate memory for"
1650 " dev->dev_status_queue_obj\n");
1651 kfree(dev->dev_queue_obj);
1652 kfree(dev);
1653 return NULL;
1654 }
1655 transport_init_queue_obj(dev->dev_status_queue_obj);
1656
1657 dev->dev_flags = device_flags;
1658 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1659 dev->dev_ptr = (void *) transport_dev;
1660 dev->se_hba = hba;
1661 dev->se_sub_dev = se_dev;
1662 dev->transport = transport;
1663 atomic_set(&dev->active_cmds, 0);
1664 INIT_LIST_HEAD(&dev->dev_list);
1665 INIT_LIST_HEAD(&dev->dev_sep_list);
1666 INIT_LIST_HEAD(&dev->dev_tmr_list);
1667 INIT_LIST_HEAD(&dev->execute_task_list);
1668 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1669 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1670 INIT_LIST_HEAD(&dev->state_task_list);
1671 spin_lock_init(&dev->execute_task_lock);
1672 spin_lock_init(&dev->delayed_cmd_lock);
1673 spin_lock_init(&dev->ordered_cmd_lock);
1674 spin_lock_init(&dev->state_task_lock);
1675 spin_lock_init(&dev->dev_alua_lock);
1676 spin_lock_init(&dev->dev_reservation_lock);
1677 spin_lock_init(&dev->dev_status_lock);
1678 spin_lock_init(&dev->dev_status_thr_lock);
1679 spin_lock_init(&dev->se_port_lock);
1680 spin_lock_init(&dev->se_tmr_lock);
1681
1682 dev->queue_depth = dev_limits->queue_depth;
1683 atomic_set(&dev->depth_left, dev->queue_depth);
1684 atomic_set(&dev->dev_ordered_id, 0);
1685
1686 se_dev_set_default_attribs(dev, dev_limits);
1687
1688 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1689 dev->creation_time = get_jiffies_64();
1690 spin_lock_init(&dev->stats_lock);
1691
1692 spin_lock(&hba->device_lock);
1693 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1694 hba->dev_count++;
1695 spin_unlock(&hba->device_lock);
1696 /*
1697 * Setup the SAM Task Attribute emulation for struct se_device
1698 */
1699 core_setup_task_attr_emulation(dev);
1700 /*
1701 * Force PR and ALUA passthrough emulation with internal object use.
1702 */
1703 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1704 /*
1705 * Setup the Reservations infrastructure for struct se_device
1706 */
1707 core_setup_reservations(dev, force_pt);
1708 /*
1709 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1710 */
1711 if (core_setup_alua(dev, force_pt) < 0)
1712 goto out;
1713
1714 /*
1715 * Startup the struct se_device processing thread
1716 */
1717 dev->process_thread = kthread_run(transport_processing_thread, dev,
1718 "LIO_%s", TRANSPORT(dev)->name);
1719 if (IS_ERR(dev->process_thread)) {
1720 printk(KERN_ERR "Unable to create kthread: LIO_%s\n",
1721 TRANSPORT(dev)->name);
1722 goto out;
1723 }
1724
1725 /*
1726 * Preload the initial INQUIRY const values if we are doing
1727 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1728 * passthrough because this is being provided by the backend LLD.
1729 * This is required so that transport_get_inquiry() copies these
1730 * originals once back into DEV_T10_WWN(dev) for the virtual device
1731 * setup.
1732 */
1733 if (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1734 if (!(inquiry_prod) || !(inquiry_prod)) {
1735 printk(KERN_ERR "All non TCM/pSCSI plugins require"
1736 " INQUIRY consts\n");
1737 goto out;
1738 }
1739
1740 strncpy(&DEV_T10_WWN(dev)->vendor[0], "LIO-ORG", 8);
1741 strncpy(&DEV_T10_WWN(dev)->model[0], inquiry_prod, 16);
1742 strncpy(&DEV_T10_WWN(dev)->revision[0], inquiry_rev, 4);
1743 }
1744 scsi_dump_inquiry(dev);
1745
1746 return dev;
1747 out:
1748 kthread_stop(dev->process_thread);
1749
1750 spin_lock(&hba->device_lock);
1751 list_del(&dev->dev_list);
1752 hba->dev_count--;
1753 spin_unlock(&hba->device_lock);
1754
1755 se_release_vpd_for_dev(dev);
1756
1757 kfree(dev->dev_status_queue_obj);
1758 kfree(dev->dev_queue_obj);
1759 kfree(dev);
1760
1761 return NULL;
1762 }
1763 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1764
1765 /* transport_generic_prepare_cdb():
1766 *
1767 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1768 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1769 * The point of this is since we are mapping iSCSI LUNs to
1770 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1771 * devices and HBAs for a loop.
1772 */
1773 static inline void transport_generic_prepare_cdb(
1774 unsigned char *cdb)
1775 {
1776 switch (cdb[0]) {
1777 case READ_10: /* SBC - RDProtect */
1778 case READ_12: /* SBC - RDProtect */
1779 case READ_16: /* SBC - RDProtect */
1780 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1781 case VERIFY: /* SBC - VRProtect */
1782 case VERIFY_16: /* SBC - VRProtect */
1783 case WRITE_VERIFY: /* SBC - VRProtect */
1784 case WRITE_VERIFY_12: /* SBC - VRProtect */
1785 break;
1786 default:
1787 cdb[1] &= 0x1f; /* clear logical unit number */
1788 break;
1789 }
1790 }
1791
1792 static struct se_task *
1793 transport_generic_get_task(struct se_cmd *cmd,
1794 enum dma_data_direction data_direction)
1795 {
1796 struct se_task *task;
1797 struct se_device *dev = SE_DEV(cmd);
1798 unsigned long flags;
1799
1800 task = dev->transport->alloc_task(cmd);
1801 if (!task) {
1802 printk(KERN_ERR "Unable to allocate struct se_task\n");
1803 return NULL;
1804 }
1805
1806 INIT_LIST_HEAD(&task->t_list);
1807 INIT_LIST_HEAD(&task->t_execute_list);
1808 INIT_LIST_HEAD(&task->t_state_list);
1809 init_completion(&task->task_stop_comp);
1810 task->task_no = T_TASK(cmd)->t_tasks_no++;
1811 task->task_se_cmd = cmd;
1812 task->se_dev = dev;
1813 task->task_data_direction = data_direction;
1814
1815 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
1816 list_add_tail(&task->t_list, &T_TASK(cmd)->t_task_list);
1817 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
1818
1819 return task;
1820 }
1821
1822 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1823
1824 void transport_device_setup_cmd(struct se_cmd *cmd)
1825 {
1826 cmd->se_dev = SE_LUN(cmd)->lun_se_dev;
1827 }
1828 EXPORT_SYMBOL(transport_device_setup_cmd);
1829
1830 /*
1831 * Used by fabric modules containing a local struct se_cmd within their
1832 * fabric dependent per I/O descriptor.
1833 */
1834 void transport_init_se_cmd(
1835 struct se_cmd *cmd,
1836 struct target_core_fabric_ops *tfo,
1837 struct se_session *se_sess,
1838 u32 data_length,
1839 int data_direction,
1840 int task_attr,
1841 unsigned char *sense_buffer)
1842 {
1843 INIT_LIST_HEAD(&cmd->se_lun_list);
1844 INIT_LIST_HEAD(&cmd->se_delayed_list);
1845 INIT_LIST_HEAD(&cmd->se_ordered_list);
1846 /*
1847 * Setup t_task pointer to t_task_backstore
1848 */
1849 cmd->t_task = &cmd->t_task_backstore;
1850
1851 INIT_LIST_HEAD(&T_TASK(cmd)->t_task_list);
1852 init_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp);
1853 init_completion(&T_TASK(cmd)->transport_lun_stop_comp);
1854 init_completion(&T_TASK(cmd)->t_transport_stop_comp);
1855 spin_lock_init(&T_TASK(cmd)->t_state_lock);
1856 atomic_set(&T_TASK(cmd)->transport_dev_active, 1);
1857
1858 cmd->se_tfo = tfo;
1859 cmd->se_sess = se_sess;
1860 cmd->data_length = data_length;
1861 cmd->data_direction = data_direction;
1862 cmd->sam_task_attr = task_attr;
1863 cmd->sense_buffer = sense_buffer;
1864 }
1865 EXPORT_SYMBOL(transport_init_se_cmd);
1866
1867 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1868 {
1869 /*
1870 * Check if SAM Task Attribute emulation is enabled for this
1871 * struct se_device storage object
1872 */
1873 if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1874 return 0;
1875
1876 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1877 DEBUG_STA("SAM Task Attribute ACA"
1878 " emulation is not supported\n");
1879 return -1;
1880 }
1881 /*
1882 * Used to determine when ORDERED commands should go from
1883 * Dormant to Active status.
1884 */
1885 cmd->se_ordered_id = atomic_inc_return(&SE_DEV(cmd)->dev_ordered_id);
1886 smp_mb__after_atomic_inc();
1887 DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1888 cmd->se_ordered_id, cmd->sam_task_attr,
1889 TRANSPORT(cmd->se_dev)->name);
1890 return 0;
1891 }
1892
1893 void transport_free_se_cmd(
1894 struct se_cmd *se_cmd)
1895 {
1896 if (se_cmd->se_tmr_req)
1897 core_tmr_release_req(se_cmd->se_tmr_req);
1898 /*
1899 * Check and free any extended CDB buffer that was allocated
1900 */
1901 if (T_TASK(se_cmd)->t_task_cdb != T_TASK(se_cmd)->__t_task_cdb)
1902 kfree(T_TASK(se_cmd)->t_task_cdb);
1903 }
1904 EXPORT_SYMBOL(transport_free_se_cmd);
1905
1906 static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1907
1908 /* transport_generic_allocate_tasks():
1909 *
1910 * Called from fabric RX Thread.
1911 */
1912 int transport_generic_allocate_tasks(
1913 struct se_cmd *cmd,
1914 unsigned char *cdb)
1915 {
1916 int ret;
1917
1918 transport_generic_prepare_cdb(cdb);
1919
1920 /*
1921 * This is needed for early exceptions.
1922 */
1923 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1924
1925 transport_device_setup_cmd(cmd);
1926 /*
1927 * Ensure that the received CDB is less than the max (252 + 8) bytes
1928 * for VARIABLE_LENGTH_CMD
1929 */
1930 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1931 printk(KERN_ERR "Received SCSI CDB with command_size: %d that"
1932 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1933 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1934 return -1;
1935 }
1936 /*
1937 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1938 * allocate the additional extended CDB buffer now.. Otherwise
1939 * setup the pointer from __t_task_cdb to t_task_cdb.
1940 */
1941 if (scsi_command_size(cdb) > sizeof(T_TASK(cmd)->__t_task_cdb)) {
1942 T_TASK(cmd)->t_task_cdb = kzalloc(scsi_command_size(cdb),
1943 GFP_KERNEL);
1944 if (!(T_TASK(cmd)->t_task_cdb)) {
1945 printk(KERN_ERR "Unable to allocate T_TASK(cmd)->t_task_cdb"
1946 " %u > sizeof(T_TASK(cmd)->__t_task_cdb): %lu ops\n",
1947 scsi_command_size(cdb),
1948 (unsigned long)sizeof(T_TASK(cmd)->__t_task_cdb));
1949 return -1;
1950 }
1951 } else
1952 T_TASK(cmd)->t_task_cdb = &T_TASK(cmd)->__t_task_cdb[0];
1953 /*
1954 * Copy the original CDB into T_TASK(cmd).
1955 */
1956 memcpy(T_TASK(cmd)->t_task_cdb, cdb, scsi_command_size(cdb));
1957 /*
1958 * Setup the received CDB based on SCSI defined opcodes and
1959 * perform unit attention, persistent reservations and ALUA
1960 * checks for virtual device backends. The T_TASK(cmd)->t_task_cdb
1961 * pointer is expected to be setup before we reach this point.
1962 */
1963 ret = transport_generic_cmd_sequencer(cmd, cdb);
1964 if (ret < 0)
1965 return ret;
1966 /*
1967 * Check for SAM Task Attribute Emulation
1968 */
1969 if (transport_check_alloc_task_attr(cmd) < 0) {
1970 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1971 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1972 return -2;
1973 }
1974 spin_lock(&cmd->se_lun->lun_sep_lock);
1975 if (cmd->se_lun->lun_sep)
1976 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1977 spin_unlock(&cmd->se_lun->lun_sep_lock);
1978 return 0;
1979 }
1980 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1981
1982 /*
1983 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1984 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1985 */
1986 int transport_generic_handle_cdb(
1987 struct se_cmd *cmd)
1988 {
1989 if (!SE_LUN(cmd)) {
1990 dump_stack();
1991 printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
1992 return -1;
1993 }
1994
1995 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1996 return 0;
1997 }
1998 EXPORT_SYMBOL(transport_generic_handle_cdb);
1999
2000 /*
2001 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
2002 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
2003 * complete setup in TCM process context w/ TFO->new_cmd_map().
2004 */
2005 int transport_generic_handle_cdb_map(
2006 struct se_cmd *cmd)
2007 {
2008 if (!SE_LUN(cmd)) {
2009 dump_stack();
2010 printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
2011 return -1;
2012 }
2013
2014 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
2015 return 0;
2016 }
2017 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
2018
2019 /* transport_generic_handle_data():
2020 *
2021 *
2022 */
2023 int transport_generic_handle_data(
2024 struct se_cmd *cmd)
2025 {
2026 /*
2027 * For the software fabric case, then we assume the nexus is being
2028 * failed/shutdown when signals are pending from the kthread context
2029 * caller, so we return a failure. For the HW target mode case running
2030 * in interrupt code, the signal_pending() check is skipped.
2031 */
2032 if (!in_interrupt() && signal_pending(current))
2033 return -1;
2034 /*
2035 * If the received CDB has aleady been ABORTED by the generic
2036 * target engine, we now call transport_check_aborted_status()
2037 * to queue any delated TASK_ABORTED status for the received CDB to the
2038 * fabric module as we are expecting no further incoming DATA OUT
2039 * sequences at this point.
2040 */
2041 if (transport_check_aborted_status(cmd, 1) != 0)
2042 return 0;
2043
2044 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
2045 return 0;
2046 }
2047 EXPORT_SYMBOL(transport_generic_handle_data);
2048
2049 /* transport_generic_handle_tmr():
2050 *
2051 *
2052 */
2053 int transport_generic_handle_tmr(
2054 struct se_cmd *cmd)
2055 {
2056 /*
2057 * This is needed for early exceptions.
2058 */
2059 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
2060 transport_device_setup_cmd(cmd);
2061
2062 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
2063 return 0;
2064 }
2065 EXPORT_SYMBOL(transport_generic_handle_tmr);
2066
2067 void transport_generic_free_cmd_intr(
2068 struct se_cmd *cmd)
2069 {
2070 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
2071 }
2072 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
2073
2074 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
2075 {
2076 struct se_task *task, *task_tmp;
2077 unsigned long flags;
2078 int ret = 0;
2079
2080 DEBUG_TS("ITT[0x%08x] - Stopping tasks\n",
2081 CMD_TFO(cmd)->get_task_tag(cmd));
2082
2083 /*
2084 * No tasks remain in the execution queue
2085 */
2086 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2087 list_for_each_entry_safe(task, task_tmp,
2088 &T_TASK(cmd)->t_task_list, t_list) {
2089 DEBUG_TS("task_no[%d] - Processing task %p\n",
2090 task->task_no, task);
2091 /*
2092 * If the struct se_task has not been sent and is not active,
2093 * remove the struct se_task from the execution queue.
2094 */
2095 if (!atomic_read(&task->task_sent) &&
2096 !atomic_read(&task->task_active)) {
2097 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
2098 flags);
2099 transport_remove_task_from_execute_queue(task,
2100 task->se_dev);
2101
2102 DEBUG_TS("task_no[%d] - Removed from execute queue\n",
2103 task->task_no);
2104 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2105 continue;
2106 }
2107
2108 /*
2109 * If the struct se_task is active, sleep until it is returned
2110 * from the plugin.
2111 */
2112 if (atomic_read(&task->task_active)) {
2113 atomic_set(&task->task_stop, 1);
2114 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
2115 flags);
2116
2117 DEBUG_TS("task_no[%d] - Waiting to complete\n",
2118 task->task_no);
2119 wait_for_completion(&task->task_stop_comp);
2120 DEBUG_TS("task_no[%d] - Stopped successfully\n",
2121 task->task_no);
2122
2123 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2124 atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
2125
2126 atomic_set(&task->task_active, 0);
2127 atomic_set(&task->task_stop, 0);
2128 } else {
2129 DEBUG_TS("task_no[%d] - Did nothing\n", task->task_no);
2130 ret++;
2131 }
2132
2133 __transport_stop_task_timer(task, &flags);
2134 }
2135 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2136
2137 return ret;
2138 }
2139
2140 static void transport_failure_reset_queue_depth(struct se_device *dev)
2141 {
2142 unsigned long flags;
2143
2144 spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);
2145 atomic_inc(&dev->depth_left);
2146 atomic_inc(&SE_HBA(dev)->left_queue_depth);
2147 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
2148 }
2149
2150 /*
2151 * Handle SAM-esque emulation for generic transport request failures.
2152 */
2153 static void transport_generic_request_failure(
2154 struct se_cmd *cmd,
2155 struct se_device *dev,
2156 int complete,
2157 int sc)
2158 {
2159 DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
2160 " CDB: 0x%02x\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd),
2161 T_TASK(cmd)->t_task_cdb[0]);
2162 DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:"
2163 " %d/%d transport_error_status: %d\n",
2164 CMD_TFO(cmd)->get_cmd_state(cmd),
2165 cmd->t_state, cmd->deferred_t_state,
2166 cmd->transport_error_status);
2167 DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d"
2168 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
2169 " t_transport_active: %d t_transport_stop: %d"
2170 " t_transport_sent: %d\n", T_TASK(cmd)->t_task_cdbs,
2171 atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
2172 atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
2173 atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left),
2174 atomic_read(&T_TASK(cmd)->t_transport_active),
2175 atomic_read(&T_TASK(cmd)->t_transport_stop),
2176 atomic_read(&T_TASK(cmd)->t_transport_sent));
2177
2178 transport_stop_all_task_timers(cmd);
2179
2180 if (dev)
2181 transport_failure_reset_queue_depth(dev);
2182 /*
2183 * For SAM Task Attribute emulation for failed struct se_cmd
2184 */
2185 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2186 transport_complete_task_attr(cmd);
2187
2188 if (complete) {
2189 transport_direct_request_timeout(cmd);
2190 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2191 }
2192
2193 switch (cmd->transport_error_status) {
2194 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
2195 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2196 break;
2197 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
2198 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
2199 break;
2200 case PYX_TRANSPORT_INVALID_CDB_FIELD:
2201 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2202 break;
2203 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
2204 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2205 break;
2206 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
2207 if (!sc)
2208 transport_new_cmd_failure(cmd);
2209 /*
2210 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2211 * we force this session to fall back to session
2212 * recovery.
2213 */
2214 CMD_TFO(cmd)->fall_back_to_erl0(cmd->se_sess);
2215 CMD_TFO(cmd)->stop_session(cmd->se_sess, 0, 0);
2216
2217 goto check_stop;
2218 case PYX_TRANSPORT_LU_COMM_FAILURE:
2219 case PYX_TRANSPORT_ILLEGAL_REQUEST:
2220 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2221 break;
2222 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
2223 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
2224 break;
2225 case PYX_TRANSPORT_WRITE_PROTECTED:
2226 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
2227 break;
2228 case PYX_TRANSPORT_RESERVATION_CONFLICT:
2229 /*
2230 * No SENSE Data payload for this case, set SCSI Status
2231 * and queue the response to $FABRIC_MOD.
2232 *
2233 * Uses linux/include/scsi/scsi.h SAM status codes defs
2234 */
2235 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2236 /*
2237 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2238 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2239 * CONFLICT STATUS.
2240 *
2241 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2242 */
2243 if (SE_SESS(cmd) &&
2244 DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2)
2245 core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl,
2246 cmd->orig_fe_lun, 0x2C,
2247 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2248
2249 CMD_TFO(cmd)->queue_status(cmd);
2250 goto check_stop;
2251 case PYX_TRANSPORT_USE_SENSE_REASON:
2252 /*
2253 * struct se_cmd->scsi_sense_reason already set
2254 */
2255 break;
2256 default:
2257 printk(KERN_ERR "Unknown transport error for CDB 0x%02x: %d\n",
2258 T_TASK(cmd)->t_task_cdb[0],
2259 cmd->transport_error_status);
2260 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2261 break;
2262 }
2263
2264 if (!sc)
2265 transport_new_cmd_failure(cmd);
2266 else
2267 transport_send_check_condition_and_sense(cmd,
2268 cmd->scsi_sense_reason, 0);
2269 check_stop:
2270 transport_lun_remove_cmd(cmd);
2271 if (!(transport_cmd_check_stop_to_fabric(cmd)))
2272 ;
2273 }
2274
2275 static void transport_direct_request_timeout(struct se_cmd *cmd)
2276 {
2277 unsigned long flags;
2278
2279 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2280 if (!(atomic_read(&T_TASK(cmd)->t_transport_timeout))) {
2281 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2282 return;
2283 }
2284 if (atomic_read(&T_TASK(cmd)->t_task_cdbs_timeout_left)) {
2285 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2286 return;
2287 }
2288
2289 atomic_sub(atomic_read(&T_TASK(cmd)->t_transport_timeout),
2290 &T_TASK(cmd)->t_se_count);
2291 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2292 }
2293
2294 static void transport_generic_request_timeout(struct se_cmd *cmd)
2295 {
2296 unsigned long flags;
2297
2298 /*
2299 * Reset T_TASK(cmd)->t_se_count to allow transport_generic_remove()
2300 * to allow last call to free memory resources.
2301 */
2302 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2303 if (atomic_read(&T_TASK(cmd)->t_transport_timeout) > 1) {
2304 int tmp = (atomic_read(&T_TASK(cmd)->t_transport_timeout) - 1);
2305
2306 atomic_sub(tmp, &T_TASK(cmd)->t_se_count);
2307 }
2308 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2309
2310 transport_generic_remove(cmd, 0, 0);
2311 }
2312
2313 static int
2314 transport_generic_allocate_buf(struct se_cmd *cmd, u32 data_length)
2315 {
2316 unsigned char *buf;
2317
2318 buf = kzalloc(data_length, GFP_KERNEL);
2319 if (!(buf)) {
2320 printk(KERN_ERR "Unable to allocate memory for buffer\n");
2321 return -1;
2322 }
2323
2324 T_TASK(cmd)->t_tasks_se_num = 0;
2325 T_TASK(cmd)->t_task_buf = buf;
2326
2327 return 0;
2328 }
2329
2330 static inline u32 transport_lba_21(unsigned char *cdb)
2331 {
2332 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2333 }
2334
2335 static inline u32 transport_lba_32(unsigned char *cdb)
2336 {
2337 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2338 }
2339
2340 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2341 {
2342 unsigned int __v1, __v2;
2343
2344 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2345 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2346
2347 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2348 }
2349
2350 /*
2351 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2352 */
2353 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2354 {
2355 unsigned int __v1, __v2;
2356
2357 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2358 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2359
2360 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2361 }
2362
2363 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2364 {
2365 unsigned long flags;
2366
2367 spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags);
2368 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2369 spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags);
2370 }
2371
2372 /*
2373 * Called from interrupt context.
2374 */
2375 static void transport_task_timeout_handler(unsigned long data)
2376 {
2377 struct se_task *task = (struct se_task *)data;
2378 struct se_cmd *cmd = TASK_CMD(task);
2379 unsigned long flags;
2380
2381 DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2382
2383 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2384 if (task->task_flags & TF_STOP) {
2385 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2386 return;
2387 }
2388 task->task_flags &= ~TF_RUNNING;
2389
2390 /*
2391 * Determine if transport_complete_task() has already been called.
2392 */
2393 if (!(atomic_read(&task->task_active))) {
2394 DEBUG_TT("transport task: %p cmd: %p timeout task_active"
2395 " == 0\n", task, cmd);
2396 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2397 return;
2398 }
2399
2400 atomic_inc(&T_TASK(cmd)->t_se_count);
2401 atomic_inc(&T_TASK(cmd)->t_transport_timeout);
2402 T_TASK(cmd)->t_tasks_failed = 1;
2403
2404 atomic_set(&task->task_timeout, 1);
2405 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2406 task->task_scsi_status = 1;
2407
2408 if (atomic_read(&task->task_stop)) {
2409 DEBUG_TT("transport task: %p cmd: %p timeout task_stop"
2410 " == 1\n", task, cmd);
2411 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2412 complete(&task->task_stop_comp);
2413 return;
2414 }
2415
2416 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) {
2417 DEBUG_TT("transport task: %p cmd: %p timeout non zero"
2418 " t_task_cdbs_left\n", task, cmd);
2419 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2420 return;
2421 }
2422 DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2423 task, cmd);
2424
2425 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
2426 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2427
2428 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2429 }
2430
2431 /*
2432 * Called with T_TASK(cmd)->t_state_lock held.
2433 */
2434 static void transport_start_task_timer(struct se_task *task)
2435 {
2436 struct se_device *dev = task->se_dev;
2437 int timeout;
2438
2439 if (task->task_flags & TF_RUNNING)
2440 return;
2441 /*
2442 * If the task_timeout is disabled, exit now.
2443 */
2444 timeout = DEV_ATTRIB(dev)->task_timeout;
2445 if (!(timeout))
2446 return;
2447
2448 init_timer(&task->task_timer);
2449 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2450 task->task_timer.data = (unsigned long) task;
2451 task->task_timer.function = transport_task_timeout_handler;
2452
2453 task->task_flags |= TF_RUNNING;
2454 add_timer(&task->task_timer);
2455 #if 0
2456 printk(KERN_INFO "Starting task timer for cmd: %p task: %p seconds:"
2457 " %d\n", task->task_se_cmd, task, timeout);
2458 #endif
2459 }
2460
2461 /*
2462 * Called with spin_lock_irq(&T_TASK(cmd)->t_state_lock) held.
2463 */
2464 void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2465 {
2466 struct se_cmd *cmd = TASK_CMD(task);
2467
2468 if (!(task->task_flags & TF_RUNNING))
2469 return;
2470
2471 task->task_flags |= TF_STOP;
2472 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, *flags);
2473
2474 del_timer_sync(&task->task_timer);
2475
2476 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, *flags);
2477 task->task_flags &= ~TF_RUNNING;
2478 task->task_flags &= ~TF_STOP;
2479 }
2480
2481 static void transport_stop_all_task_timers(struct se_cmd *cmd)
2482 {
2483 struct se_task *task = NULL, *task_tmp;
2484 unsigned long flags;
2485
2486 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2487 list_for_each_entry_safe(task, task_tmp,
2488 &T_TASK(cmd)->t_task_list, t_list)
2489 __transport_stop_task_timer(task, &flags);
2490 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2491 }
2492
2493 static inline int transport_tcq_window_closed(struct se_device *dev)
2494 {
2495 if (dev->dev_tcq_window_closed++ <
2496 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2497 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2498 } else
2499 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2500
2501 wake_up_interruptible(&dev->dev_queue_obj->thread_wq);
2502 return 0;
2503 }
2504
2505 /*
2506 * Called from Fabric Module context from transport_execute_tasks()
2507 *
2508 * The return of this function determins if the tasks from struct se_cmd
2509 * get added to the execution queue in transport_execute_tasks(),
2510 * or are added to the delayed or ordered lists here.
2511 */
2512 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2513 {
2514 if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2515 return 1;
2516 /*
2517 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2518 * to allow the passed struct se_cmd list of tasks to the front of the list.
2519 */
2520 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2521 atomic_inc(&SE_DEV(cmd)->dev_hoq_count);
2522 smp_mb__after_atomic_inc();
2523 DEBUG_STA("Added HEAD_OF_QUEUE for CDB:"
2524 " 0x%02x, se_ordered_id: %u\n",
2525 T_TASK(cmd)->t_task_cdb[0],
2526 cmd->se_ordered_id);
2527 return 1;
2528 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2529 spin_lock(&SE_DEV(cmd)->ordered_cmd_lock);
2530 list_add_tail(&cmd->se_ordered_list,
2531 &SE_DEV(cmd)->ordered_cmd_list);
2532 spin_unlock(&SE_DEV(cmd)->ordered_cmd_lock);
2533
2534 atomic_inc(&SE_DEV(cmd)->dev_ordered_sync);
2535 smp_mb__after_atomic_inc();
2536
2537 DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered"
2538 " list, se_ordered_id: %u\n",
2539 T_TASK(cmd)->t_task_cdb[0],
2540 cmd->se_ordered_id);
2541 /*
2542 * Add ORDERED command to tail of execution queue if
2543 * no other older commands exist that need to be
2544 * completed first.
2545 */
2546 if (!(atomic_read(&SE_DEV(cmd)->simple_cmds)))
2547 return 1;
2548 } else {
2549 /*
2550 * For SIMPLE and UNTAGGED Task Attribute commands
2551 */
2552 atomic_inc(&SE_DEV(cmd)->simple_cmds);
2553 smp_mb__after_atomic_inc();
2554 }
2555 /*
2556 * Otherwise if one or more outstanding ORDERED task attribute exist,
2557 * add the dormant task(s) built for the passed struct se_cmd to the
2558 * execution queue and become in Active state for this struct se_device.
2559 */
2560 if (atomic_read(&SE_DEV(cmd)->dev_ordered_sync) != 0) {
2561 /*
2562 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2563 * will be drained upon completion of HEAD_OF_QUEUE task.
2564 */
2565 spin_lock(&SE_DEV(cmd)->delayed_cmd_lock);
2566 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2567 list_add_tail(&cmd->se_delayed_list,
2568 &SE_DEV(cmd)->delayed_cmd_list);
2569 spin_unlock(&SE_DEV(cmd)->delayed_cmd_lock);
2570
2571 DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to"
2572 " delayed CMD list, se_ordered_id: %u\n",
2573 T_TASK(cmd)->t_task_cdb[0], cmd->sam_task_attr,
2574 cmd->se_ordered_id);
2575 /*
2576 * Return zero to let transport_execute_tasks() know
2577 * not to add the delayed tasks to the execution list.
2578 */
2579 return 0;
2580 }
2581 /*
2582 * Otherwise, no ORDERED task attributes exist..
2583 */
2584 return 1;
2585 }
2586
2587 /*
2588 * Called from fabric module context in transport_generic_new_cmd() and
2589 * transport_generic_process_write()
2590 */
2591 static int transport_execute_tasks(struct se_cmd *cmd)
2592 {
2593 int add_tasks;
2594
2595 if (!(cmd->se_cmd_flags & SCF_SE_DISABLE_ONLINE_CHECK)) {
2596 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2597 cmd->transport_error_status =
2598 PYX_TRANSPORT_LU_COMM_FAILURE;
2599 transport_generic_request_failure(cmd, NULL, 0, 1);
2600 return 0;
2601 }
2602 }
2603 /*
2604 * Call transport_cmd_check_stop() to see if a fabric exception
2605 * has occurred that prevents execution.
2606 */
2607 if (!(transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))) {
2608 /*
2609 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2610 * attribute for the tasks of the received struct se_cmd CDB
2611 */
2612 add_tasks = transport_execute_task_attr(cmd);
2613 if (add_tasks == 0)
2614 goto execute_tasks;
2615 /*
2616 * This calls transport_add_tasks_from_cmd() to handle
2617 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2618 * (if enabled) in __transport_add_task_to_execute_queue() and
2619 * transport_add_task_check_sam_attr().
2620 */
2621 transport_add_tasks_from_cmd(cmd);
2622 }
2623 /*
2624 * Kick the execution queue for the cmd associated struct se_device
2625 * storage object.
2626 */
2627 execute_tasks:
2628 __transport_execute_tasks(SE_DEV(cmd));
2629 return 0;
2630 }
2631
2632 /*
2633 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2634 * from struct se_device->execute_task_list and
2635 *
2636 * Called from transport_processing_thread()
2637 */
2638 static int __transport_execute_tasks(struct se_device *dev)
2639 {
2640 int error;
2641 struct se_cmd *cmd = NULL;
2642 struct se_task *task;
2643 unsigned long flags;
2644
2645 /*
2646 * Check if there is enough room in the device and HBA queue to send
2647 * struct se_transport_task's to the selected transport.
2648 */
2649 check_depth:
2650 spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);
2651 if (!(atomic_read(&dev->depth_left)) ||
2652 !(atomic_read(&SE_HBA(dev)->left_queue_depth))) {
2653 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
2654 return transport_tcq_window_closed(dev);
2655 }
2656 dev->dev_tcq_window_closed = 0;
2657
2658 spin_lock(&dev->execute_task_lock);
2659 task = transport_get_task_from_execute_queue(dev);
2660 spin_unlock(&dev->execute_task_lock);
2661
2662 if (!task) {
2663 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
2664 return 0;
2665 }
2666
2667 atomic_dec(&dev->depth_left);
2668 atomic_dec(&SE_HBA(dev)->left_queue_depth);
2669 spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
2670
2671 cmd = TASK_CMD(task);
2672
2673 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
2674 atomic_set(&task->task_active, 1);
2675 atomic_set(&task->task_sent, 1);
2676 atomic_inc(&T_TASK(cmd)->t_task_cdbs_sent);
2677
2678 if (atomic_read(&T_TASK(cmd)->t_task_cdbs_sent) ==
2679 T_TASK(cmd)->t_task_cdbs)
2680 atomic_set(&cmd->transport_sent, 1);
2681
2682 transport_start_task_timer(task);
2683 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
2684 /*
2685 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2686 * to grab REPORT_LUNS CDBs before they hit the
2687 * struct se_subsystem_api->do_task() caller below.
2688 */
2689 if (cmd->transport_emulate_cdb) {
2690 error = cmd->transport_emulate_cdb(cmd);
2691 if (error != 0) {
2692 cmd->transport_error_status = error;
2693 atomic_set(&task->task_active, 0);
2694 atomic_set(&cmd->transport_sent, 0);
2695 transport_stop_tasks_for_cmd(cmd);
2696 transport_generic_request_failure(cmd, dev, 0, 1);
2697 goto check_depth;
2698 }
2699 /*
2700 * Handle the successful completion for transport_emulate_cdb()
2701 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2702 * Otherwise the caller is expected to complete the task with
2703 * proper status.
2704 */
2705 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2706 cmd->scsi_status = SAM_STAT_GOOD;
2707 task->task_scsi_status = GOOD;
2708 transport_complete_task(task, 1);
2709 }
2710 } else {
2711 /*
2712 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2713 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2714 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2715 * LUN emulation code.
2716 *
2717 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2718 * call ->do_task() directly and let the underlying TCM subsystem plugin
2719 * code handle the CDB emulation.
2720 */
2721 if ((TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2722 (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2723 error = transport_emulate_control_cdb(task);
2724 else
2725 error = TRANSPORT(dev)->do_task(task);
2726
2727 if (error != 0) {
2728 cmd->transport_error_status = error;
2729 atomic_set(&task->task_active, 0);
2730 atomic_set(&cmd->transport_sent, 0);
2731 transport_stop_tasks_for_cmd(cmd);
2732 transport_generic_request_failure(cmd, dev, 0, 1);
2733 }
2734 }
2735
2736 goto check_depth;
2737
2738 return 0;
2739 }
2740
2741 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2742 {
2743 unsigned long flags;
2744 /*
2745 * Any unsolicited data will get dumped for failed command inside of
2746 * the fabric plugin
2747 */
2748 spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags);
2749 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2750 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2751 spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags);
2752
2753 CMD_TFO(se_cmd)->new_cmd_failure(se_cmd);
2754 }
2755
2756 static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2757
2758 static inline u32 transport_get_sectors_6(
2759 unsigned char *cdb,
2760 struct se_cmd *cmd,
2761 int *ret)
2762 {
2763 struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
2764
2765 /*
2766 * Assume TYPE_DISK for non struct se_device objects.
2767 * Use 8-bit sector value.
2768 */
2769 if (!dev)
2770 goto type_disk;
2771
2772 /*
2773 * Use 24-bit allocation length for TYPE_TAPE.
2774 */
2775 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE)
2776 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2777
2778 /*
2779 * Everything else assume TYPE_DISK Sector CDB location.
2780 * Use 8-bit sector value.
2781 */
2782 type_disk:
2783 return (u32)cdb[4];
2784 }
2785
2786 static inline u32 transport_get_sectors_10(
2787 unsigned char *cdb,
2788 struct se_cmd *cmd,
2789 int *ret)
2790 {
2791 struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
2792
2793 /*
2794 * Assume TYPE_DISK for non struct se_device objects.
2795 * Use 16-bit sector value.
2796 */
2797 if (!dev)
2798 goto type_disk;
2799
2800 /*
2801 * XXX_10 is not defined in SSC, throw an exception
2802 */
2803 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
2804 *ret = -1;
2805 return 0;
2806 }
2807
2808 /*
2809 * Everything else assume TYPE_DISK Sector CDB location.
2810 * Use 16-bit sector value.
2811 */
2812 type_disk:
2813 return (u32)(cdb[7] << 8) + cdb[8];
2814 }
2815
2816 static inline u32 transport_get_sectors_12(
2817 unsigned char *cdb,
2818 struct se_cmd *cmd,
2819 int *ret)
2820 {
2821 struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
2822
2823 /*
2824 * Assume TYPE_DISK for non struct se_device objects.
2825 * Use 32-bit sector value.
2826 */
2827 if (!dev)
2828 goto type_disk;
2829
2830 /*
2831 * XXX_12 is not defined in SSC, throw an exception
2832 */
2833 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
2834 *ret = -1;
2835 return 0;
2836 }
2837
2838 /*
2839 * Everything else assume TYPE_DISK Sector CDB location.
2840 * Use 32-bit sector value.
2841 */
2842 type_disk:
2843 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2844 }
2845
2846 static inline u32 transport_get_sectors_16(
2847 unsigned char *cdb,
2848 struct se_cmd *cmd,
2849 int *ret)
2850 {
2851 struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
2852
2853 /*
2854 * Assume TYPE_DISK for non struct se_device objects.
2855 * Use 32-bit sector value.
2856 */
2857 if (!dev)
2858 goto type_disk;
2859
2860 /*
2861 * Use 24-bit allocation length for TYPE_TAPE.
2862 */
2863 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE)
2864 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2865
2866 type_disk:
2867 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2868 (cdb[12] << 8) + cdb[13];
2869 }
2870
2871 /*
2872 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2873 */
2874 static inline u32 transport_get_sectors_32(
2875 unsigned char *cdb,
2876 struct se_cmd *cmd,
2877 int *ret)
2878 {
2879 /*
2880 * Assume TYPE_DISK for non struct se_device objects.
2881 * Use 32-bit sector value.
2882 */
2883 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2884 (cdb[30] << 8) + cdb[31];
2885
2886 }
2887
2888 static inline u32 transport_get_size(
2889 u32 sectors,
2890 unsigned char *cdb,
2891 struct se_cmd *cmd)
2892 {
2893 struct se_device *dev = SE_DEV(cmd);
2894
2895 if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
2896 if (cdb[1] & 1) { /* sectors */
2897 return DEV_ATTRIB(dev)->block_size * sectors;
2898 } else /* bytes */
2899 return sectors;
2900 }
2901 #if 0
2902 printk(KERN_INFO "Returning block_size: %u, sectors: %u == %u for"
2903 " %s object\n", DEV_ATTRIB(dev)->block_size, sectors,
2904 DEV_ATTRIB(dev)->block_size * sectors,
2905 TRANSPORT(dev)->name);
2906 #endif
2907 return DEV_ATTRIB(dev)->block_size * sectors;
2908 }
2909
2910 unsigned char transport_asciihex_to_binaryhex(unsigned char val[2])
2911 {
2912 unsigned char result = 0;
2913 /*
2914 * MSB
2915 */
2916 if ((val[0] >= 'a') && (val[0] <= 'f'))
2917 result = ((val[0] - 'a' + 10) & 0xf) << 4;
2918 else
2919 if ((val[0] >= 'A') && (val[0] <= 'F'))
2920 result = ((val[0] - 'A' + 10) & 0xf) << 4;
2921 else /* digit */
2922 result = ((val[0] - '0') & 0xf) << 4;
2923 /*
2924 * LSB
2925 */
2926 if ((val[1] >= 'a') && (val[1] <= 'f'))
2927 result |= ((val[1] - 'a' + 10) & 0xf);
2928 else
2929 if ((val[1] >= 'A') && (val[1] <= 'F'))
2930 result |= ((val[1] - 'A' + 10) & 0xf);
2931 else /* digit */
2932 result |= ((val[1] - '0') & 0xf);
2933
2934 return result;
2935 }
2936 EXPORT_SYMBOL(transport_asciihex_to_binaryhex);
2937
2938 static void transport_xor_callback(struct se_cmd *cmd)
2939 {
2940 unsigned char *buf, *addr;
2941 struct se_mem *se_mem;
2942 unsigned int offset;
2943 int i;
2944 /*
2945 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2946 *
2947 * 1) read the specified logical block(s);
2948 * 2) transfer logical blocks from the data-out buffer;
2949 * 3) XOR the logical blocks transferred from the data-out buffer with
2950 * the logical blocks read, storing the resulting XOR data in a buffer;
2951 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2952 * blocks transferred from the data-out buffer; and
2953 * 5) transfer the resulting XOR data to the data-in buffer.
2954 */
2955 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2956 if (!(buf)) {
2957 printk(KERN_ERR "Unable to allocate xor_callback buf\n");
2958 return;
2959 }
2960 /*
2961 * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list
2962 * into the locally allocated *buf
2963 */
2964 transport_memcpy_se_mem_read_contig(cmd, buf, T_TASK(cmd)->t_mem_list);
2965 /*
2966 * Now perform the XOR against the BIDI read memory located at
2967 * T_TASK(cmd)->t_mem_bidi_list
2968 */
2969
2970 offset = 0;
2971 list_for_each_entry(se_mem, T_TASK(cmd)->t_mem_bidi_list, se_list) {
2972 addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0);
2973 if (!(addr))
2974 goto out;
2975
2976 for (i = 0; i < se_mem->se_len; i++)
2977 *(addr + se_mem->se_off + i) ^= *(buf + offset + i);
2978
2979 offset += se_mem->se_len;
2980 kunmap_atomic(addr, KM_USER0);
2981 }
2982 out:
2983 kfree(buf);
2984 }
2985
2986 /*
2987 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2988 */
2989 static int transport_get_sense_data(struct se_cmd *cmd)
2990 {
2991 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2992 struct se_device *dev;
2993 struct se_task *task = NULL, *task_tmp;
2994 unsigned long flags;
2995 u32 offset = 0;
2996
2997 if (!SE_LUN(cmd)) {
2998 printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
2999 return -1;
3000 }
3001 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
3002 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3003 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
3004 return 0;
3005 }
3006
3007 list_for_each_entry_safe(task, task_tmp,
3008 &T_TASK(cmd)->t_task_list, t_list) {
3009
3010 if (!task->task_sense)
3011 continue;
3012
3013 dev = task->se_dev;
3014 if (!(dev))
3015 continue;
3016
3017 if (!TRANSPORT(dev)->get_sense_buffer) {
3018 printk(KERN_ERR "TRANSPORT(dev)->get_sense_buffer"
3019 " is NULL\n");
3020 continue;
3021 }
3022
3023 sense_buffer = TRANSPORT(dev)->get_sense_buffer(task);
3024 if (!(sense_buffer)) {
3025 printk(KERN_ERR "ITT[0x%08x]_TASK[%d]: Unable to locate"
3026 " sense buffer for task with sense\n",
3027 CMD_TFO(cmd)->get_task_tag(cmd), task->task_no);
3028 continue;
3029 }
3030 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
3031
3032 offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd,
3033 TRANSPORT_SENSE_BUFFER);
3034
3035 memcpy((void *)&buffer[offset], (void *)sense_buffer,
3036 TRANSPORT_SENSE_BUFFER);
3037 cmd->scsi_status = task->task_scsi_status;
3038 /* Automatically padded */
3039 cmd->scsi_sense_length =
3040 (TRANSPORT_SENSE_BUFFER + offset);
3041
3042 printk(KERN_INFO "HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
3043 " and sense\n",
3044 dev->se_hba->hba_id, TRANSPORT(dev)->name,
3045 cmd->scsi_status);
3046 return 0;
3047 }
3048 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
3049
3050 return -1;
3051 }
3052
3053 static int transport_allocate_resources(struct se_cmd *cmd)
3054 {
3055 u32 length = cmd->data_length;
3056
3057 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3058 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB))
3059 return transport_generic_get_mem(cmd, length, PAGE_SIZE);
3060 else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB)
3061 return transport_generic_allocate_buf(cmd, length);
3062 else
3063 return 0;
3064 }
3065
3066 static int
3067 transport_handle_reservation_conflict(struct se_cmd *cmd)
3068 {
3069 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3070 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3071 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
3072 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
3073 /*
3074 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
3075 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
3076 * CONFLICT STATUS.
3077 *
3078 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
3079 */
3080 if (SE_SESS(cmd) &&
3081 DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2)
3082 core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl,
3083 cmd->orig_fe_lun, 0x2C,
3084 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
3085 return -2;
3086 }
3087
3088 /* transport_generic_cmd_sequencer():
3089 *
3090 * Generic Command Sequencer that should work for most DAS transport
3091 * drivers.
3092 *
3093 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
3094 * RX Thread.
3095 *
3096 * FIXME: Need to support other SCSI OPCODES where as well.
3097 */
3098 static int transport_generic_cmd_sequencer(
3099 struct se_cmd *cmd,
3100 unsigned char *cdb)
3101 {
3102 struct se_device *dev = SE_DEV(cmd);
3103 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
3104 int ret = 0, sector_ret = 0, passthrough;
3105 u32 sectors = 0, size = 0, pr_reg_type = 0;
3106 u16 service_action;
3107 u8 alua_ascq = 0;
3108 /*
3109 * Check for an existing UNIT ATTENTION condition
3110 */
3111 if (core_scsi3_ua_check(cmd, cdb) < 0) {
3112 cmd->transport_wait_for_tasks =
3113 &transport_nop_wait_for_tasks;
3114 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3115 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
3116 return -2;
3117 }
3118 /*
3119 * Check status of Asymmetric Logical Unit Assignment port
3120 */
3121 ret = T10_ALUA(su_dev)->alua_state_check(cmd, cdb, &alua_ascq);
3122 if (ret != 0) {
3123 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3124 /*
3125 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
3126 * The ALUA additional sense code qualifier (ASCQ) is determined
3127 * by the ALUA primary or secondary access state..
3128 */
3129 if (ret > 0) {
3130 #if 0
3131 printk(KERN_INFO "[%s]: ALUA TG Port not available,"
3132 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
3133 CMD_TFO(cmd)->get_fabric_name(), alua_ascq);
3134 #endif
3135 transport_set_sense_codes(cmd, 0x04, alua_ascq);
3136 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3137 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
3138 return -2;
3139 }
3140 goto out_invalid_cdb_field;
3141 }
3142 /*
3143 * Check status for SPC-3 Persistent Reservations
3144 */
3145 if (T10_PR_OPS(su_dev)->t10_reservation_check(cmd, &pr_reg_type) != 0) {
3146 if (T10_PR_OPS(su_dev)->t10_seq_non_holder(
3147 cmd, cdb, pr_reg_type) != 0)
3148 return transport_handle_reservation_conflict(cmd);
3149 /*
3150 * This means the CDB is allowed for the SCSI Initiator port
3151 * when said port is *NOT* holding the legacy SPC-2 or
3152 * SPC-3 Persistent Reservation.
3153 */
3154 }
3155
3156 switch (cdb[0]) {
3157 case READ_6:
3158 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
3159 if (sector_ret)
3160 goto out_unsupported_cdb;
3161 size = transport_get_size(sectors, cdb, cmd);
3162 cmd->transport_split_cdb = &split_cdb_XX_6;
3163 T_TASK(cmd)->t_task_lba = transport_lba_21(cdb);
3164 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3165 break;
3166 case READ_10:
3167 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3168 if (sector_ret)
3169 goto out_unsupported_cdb;
3170 size = transport_get_size(sectors, cdb, cmd);
3171 cmd->transport_split_cdb = &split_cdb_XX_10;
3172 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3173 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3174 break;
3175 case READ_12:
3176 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3177 if (sector_ret)
3178 goto out_unsupported_cdb;
3179 size = transport_get_size(sectors, cdb, cmd);
3180 cmd->transport_split_cdb = &split_cdb_XX_12;
3181 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3182 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3183 break;
3184 case READ_16:
3185 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3186 if (sector_ret)
3187 goto out_unsupported_cdb;
3188 size = transport_get_size(sectors, cdb, cmd);
3189 cmd->transport_split_cdb = &split_cdb_XX_16;
3190 T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
3191 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3192 break;
3193 case WRITE_6:
3194 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
3195 if (sector_ret)
3196 goto out_unsupported_cdb;
3197 size = transport_get_size(sectors, cdb, cmd);
3198 cmd->transport_split_cdb = &split_cdb_XX_6;
3199 T_TASK(cmd)->t_task_lba = transport_lba_21(cdb);
3200 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3201 break;
3202 case WRITE_10:
3203 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3204 if (sector_ret)
3205 goto out_unsupported_cdb;
3206 size = transport_get_size(sectors, cdb, cmd);
3207 cmd->transport_split_cdb = &split_cdb_XX_10;
3208 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3209 T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
3210 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3211 break;
3212 case WRITE_12:
3213 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3214 if (sector_ret)
3215 goto out_unsupported_cdb;
3216 size = transport_get_size(sectors, cdb, cmd);
3217 cmd->transport_split_cdb = &split_cdb_XX_12;
3218 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3219 T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
3220 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3221 break;
3222 case WRITE_16:
3223 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3224 if (sector_ret)
3225 goto out_unsupported_cdb;
3226 size = transport_get_size(sectors, cdb, cmd);
3227 cmd->transport_split_cdb = &split_cdb_XX_16;
3228 T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
3229 T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
3230 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3231 break;
3232 case XDWRITEREAD_10:
3233 if ((cmd->data_direction != DMA_TO_DEVICE) ||
3234 !(T_TASK(cmd)->t_tasks_bidi))
3235 goto out_invalid_cdb_field;
3236 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3237 if (sector_ret)
3238 goto out_unsupported_cdb;
3239 size = transport_get_size(sectors, cdb, cmd);
3240 cmd->transport_split_cdb = &split_cdb_XX_10;
3241 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3242 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3243 passthrough = (TRANSPORT(dev)->transport_type ==
3244 TRANSPORT_PLUGIN_PHBA_PDEV);
3245 /*
3246 * Skip the remaining assignments for TCM/PSCSI passthrough
3247 */
3248 if (passthrough)
3249 break;
3250 /*
3251 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3252 */
3253 cmd->transport_complete_callback = &transport_xor_callback;
3254 T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
3255 break;
3256 case VARIABLE_LENGTH_CMD:
3257 service_action = get_unaligned_be16(&cdb[8]);
3258 /*
3259 * Determine if this is TCM/PSCSI device and we should disable
3260 * internal emulation for this CDB.
3261 */
3262 passthrough = (TRANSPORT(dev)->transport_type ==
3263 TRANSPORT_PLUGIN_PHBA_PDEV);
3264
3265 switch (service_action) {
3266 case XDWRITEREAD_32:
3267 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3268 if (sector_ret)
3269 goto out_unsupported_cdb;
3270 size = transport_get_size(sectors, cdb, cmd);
3271 /*
3272 * Use WRITE_32 and READ_32 opcodes for the emulated
3273 * XDWRITE_READ_32 logic.
3274 */
3275 cmd->transport_split_cdb = &split_cdb_XX_32;
3276 T_TASK(cmd)->t_task_lba = transport_lba_64_ext(cdb);
3277 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3278
3279 /*
3280 * Skip the remaining assignments for TCM/PSCSI passthrough
3281 */
3282 if (passthrough)
3283 break;
3284
3285 /*
3286 * Setup BIDI XOR callback to be run during
3287 * transport_generic_complete_ok()
3288 */
3289 cmd->transport_complete_callback = &transport_xor_callback;
3290 T_TASK(cmd)->t_tasks_fua = (cdb[10] & 0x8);
3291 break;
3292 case WRITE_SAME_32:
3293 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3294 if (sector_ret)
3295 goto out_unsupported_cdb;
3296 size = transport_get_size(sectors, cdb, cmd);
3297 T_TASK(cmd)->t_task_lba = get_unaligned_be64(&cdb[12]);
3298 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3299
3300 /*
3301 * Skip the remaining assignments for TCM/PSCSI passthrough
3302 */
3303 if (passthrough)
3304 break;
3305
3306 if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
3307 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3308 " bits not supported for Block Discard"
3309 " Emulation\n");
3310 goto out_invalid_cdb_field;
3311 }
3312 /*
3313 * Currently for the emulated case we only accept
3314 * tpws with the UNMAP=1 bit set.
3315 */
3316 if (!(cdb[10] & 0x08)) {
3317 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not"
3318 " supported for Block Discard Emulation\n");
3319 goto out_invalid_cdb_field;
3320 }
3321 break;
3322 default:
3323 printk(KERN_ERR "VARIABLE_LENGTH_CMD service action"
3324 " 0x%04x not supported\n", service_action);
3325 goto out_unsupported_cdb;
3326 }
3327 break;
3328 case 0xa3:
3329 if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
3330 /* MAINTENANCE_IN from SCC-2 */
3331 /*
3332 * Check for emulated MI_REPORT_TARGET_PGS.
3333 */
3334 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3335 cmd->transport_emulate_cdb =
3336 (T10_ALUA(su_dev)->alua_type ==
3337 SPC3_ALUA_EMULATED) ?
3338 &core_emulate_report_target_port_groups :
3339 NULL;
3340 }
3341 size = (cdb[6] << 24) | (cdb[7] << 16) |
3342 (cdb[8] << 8) | cdb[9];
3343 } else {
3344 /* GPCMD_SEND_KEY from multi media commands */
3345 size = (cdb[8] << 8) + cdb[9];
3346 }
3347 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3348 break;
3349 case MODE_SELECT:
3350 size = cdb[4];
3351 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3352 break;
3353 case MODE_SELECT_10:
3354 size = (cdb[7] << 8) + cdb[8];
3355 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3356 break;
3357 case MODE_SENSE:
3358 size = cdb[4];
3359 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3360 break;
3361 case MODE_SENSE_10:
3362 case GPCMD_READ_BUFFER_CAPACITY:
3363 case GPCMD_SEND_OPC:
3364 case LOG_SELECT:
3365 case LOG_SENSE:
3366 size = (cdb[7] << 8) + cdb[8];
3367 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3368 break;
3369 case READ_BLOCK_LIMITS:
3370 size = READ_BLOCK_LEN;
3371 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3372 break;
3373 case GPCMD_GET_CONFIGURATION:
3374 case GPCMD_READ_FORMAT_CAPACITIES:
3375 case GPCMD_READ_DISC_INFO:
3376 case GPCMD_READ_TRACK_RZONE_INFO:
3377 size = (cdb[7] << 8) + cdb[8];
3378 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3379 break;
3380 case PERSISTENT_RESERVE_IN:
3381 case PERSISTENT_RESERVE_OUT:
3382 cmd->transport_emulate_cdb =
3383 (T10_RES(su_dev)->res_type ==
3384 SPC3_PERSISTENT_RESERVATIONS) ?
3385 &core_scsi3_emulate_pr : NULL;
3386 size = (cdb[7] << 8) + cdb[8];
3387 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3388 break;
3389 case GPCMD_MECHANISM_STATUS:
3390 case GPCMD_READ_DVD_STRUCTURE:
3391 size = (cdb[8] << 8) + cdb[9];
3392 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3393 break;
3394 case READ_POSITION:
3395 size = READ_POSITION_LEN;
3396 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3397 break;
3398 case 0xa4:
3399 if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
3400 /* MAINTENANCE_OUT from SCC-2
3401 *
3402 * Check for emulated MO_SET_TARGET_PGS.
3403 */
3404 if (cdb[1] == MO_SET_TARGET_PGS) {
3405 cmd->transport_emulate_cdb =
3406 (T10_ALUA(su_dev)->alua_type ==
3407 SPC3_ALUA_EMULATED) ?
3408 &core_emulate_set_target_port_groups :
3409 NULL;
3410 }
3411
3412 size = (cdb[6] << 24) | (cdb[7] << 16) |
3413 (cdb[8] << 8) | cdb[9];
3414 } else {
3415 /* GPCMD_REPORT_KEY from multi media commands */
3416 size = (cdb[8] << 8) + cdb[9];
3417 }
3418 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3419 break;
3420 case INQUIRY:
3421 size = (cdb[3] << 8) + cdb[4];
3422 /*
3423 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3424 * See spc4r17 section 5.3
3425 */
3426 if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3427 cmd->sam_task_attr = MSG_HEAD_TAG;
3428 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3429 break;
3430 case READ_BUFFER:
3431 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3432 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3433 break;
3434 case READ_CAPACITY:
3435 size = READ_CAP_LEN;
3436 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3437 break;
3438 case READ_MEDIA_SERIAL_NUMBER:
3439 case SECURITY_PROTOCOL_IN:
3440 case SECURITY_PROTOCOL_OUT:
3441 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3442 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3443 break;
3444 case SERVICE_ACTION_IN:
3445 case ACCESS_CONTROL_IN:
3446 case ACCESS_CONTROL_OUT:
3447 case EXTENDED_COPY:
3448 case READ_ATTRIBUTE:
3449 case RECEIVE_COPY_RESULTS:
3450 case WRITE_ATTRIBUTE:
3451 size = (cdb[10] << 24) | (cdb[11] << 16) |
3452 (cdb[12] << 8) | cdb[13];
3453 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3454 break;
3455 case RECEIVE_DIAGNOSTIC:
3456 case SEND_DIAGNOSTIC:
3457 size = (cdb[3] << 8) | cdb[4];
3458 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3459 break;
3460 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3461 #if 0
3462 case GPCMD_READ_CD:
3463 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3464 size = (2336 * sectors);
3465 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3466 break;
3467 #endif
3468 case READ_TOC:
3469 size = cdb[8];
3470 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3471 break;
3472 case REQUEST_SENSE:
3473 size = cdb[4];
3474 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3475 break;
3476 case READ_ELEMENT_STATUS:
3477 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3478 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3479 break;
3480 case WRITE_BUFFER:
3481 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3482 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3483 break;
3484 case RESERVE:
3485 case RESERVE_10:
3486 /*
3487 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3488 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3489 */
3490 if (cdb[0] == RESERVE_10)
3491 size = (cdb[7] << 8) | cdb[8];
3492 else
3493 size = cmd->data_length;
3494
3495 /*
3496 * Setup the legacy emulated handler for SPC-2 and
3497 * >= SPC-3 compatible reservation handling (CRH=1)
3498 * Otherwise, we assume the underlying SCSI logic is
3499 * is running in SPC_PASSTHROUGH, and wants reservations
3500 * emulation disabled.
3501 */
3502 cmd->transport_emulate_cdb =
3503 (T10_RES(su_dev)->res_type !=
3504 SPC_PASSTHROUGH) ?
3505 &core_scsi2_emulate_crh : NULL;
3506 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3507 break;
3508 case RELEASE:
3509 case RELEASE_10:
3510 /*
3511 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3512 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3513 */
3514 if (cdb[0] == RELEASE_10)
3515 size = (cdb[7] << 8) | cdb[8];
3516 else
3517 size = cmd->data_length;
3518
3519 cmd->transport_emulate_cdb =
3520 (T10_RES(su_dev)->res_type !=
3521 SPC_PASSTHROUGH) ?
3522 &core_scsi2_emulate_crh : NULL;
3523 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3524 break;
3525 case SYNCHRONIZE_CACHE:
3526 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3527 /*
3528 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3529 */
3530 if (cdb[0] == SYNCHRONIZE_CACHE) {
3531 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3532 T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
3533 } else {
3534 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3535 T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
3536 }
3537 if (sector_ret)
3538 goto out_unsupported_cdb;
3539
3540 size = transport_get_size(sectors, cdb, cmd);
3541 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3542
3543 /*
3544 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3545 */
3546 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3547 break;
3548 /*
3549 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3550 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3551 */
3552 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3553 /*
3554 * Check to ensure that LBA + Range does not exceed past end of
3555 * device.
3556 */
3557 if (transport_get_sectors(cmd) < 0)
3558 goto out_invalid_cdb_field;
3559 break;
3560 case UNMAP:
3561 size = get_unaligned_be16(&cdb[7]);
3562 passthrough = (TRANSPORT(dev)->transport_type ==
3563 TRANSPORT_PLUGIN_PHBA_PDEV);
3564 /*
3565 * Determine if the received UNMAP used to for direct passthrough
3566 * into Linux/SCSI with struct request via TCM/pSCSI or we are
3567 * signaling the use of internal transport_generic_unmap() emulation
3568 * for UNMAP -> Linux/BLOCK disbard with TCM/IBLOCK and TCM/FILEIO
3569 * subsystem plugin backstores.
3570 */
3571 if (!(passthrough))
3572 cmd->se_cmd_flags |= SCF_EMULATE_SYNC_UNMAP;
3573
3574 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3575 break;
3576 case WRITE_SAME_16:
3577 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3578 if (sector_ret)
3579 goto out_unsupported_cdb;
3580 size = transport_get_size(sectors, cdb, cmd);
3581 T_TASK(cmd)->t_task_lba = get_unaligned_be16(&cdb[2]);
3582 passthrough = (TRANSPORT(dev)->transport_type ==
3583 TRANSPORT_PLUGIN_PHBA_PDEV);
3584 /*
3585 * Determine if the received WRITE_SAME_16 is used to for direct
3586 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3587 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3588 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3589 * TCM/FILEIO subsystem plugin backstores.
3590 */
3591 if (!(passthrough)) {
3592 if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
3593 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3594 " bits not supported for Block Discard"
3595 " Emulation\n");
3596 goto out_invalid_cdb_field;
3597 }
3598 /*
3599 * Currently for the emulated case we only accept
3600 * tpws with the UNMAP=1 bit set.
3601 */
3602 if (!(cdb[1] & 0x08)) {
3603 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not "
3604 " supported for Block Discard Emulation\n");
3605 goto out_invalid_cdb_field;
3606 }
3607 }
3608 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3609 break;
3610 case ALLOW_MEDIUM_REMOVAL:
3611 case GPCMD_CLOSE_TRACK:
3612 case ERASE:
3613 case INITIALIZE_ELEMENT_STATUS:
3614 case GPCMD_LOAD_UNLOAD:
3615 case REZERO_UNIT:
3616 case SEEK_10:
3617 case GPCMD_SET_SPEED:
3618 case SPACE:
3619 case START_STOP:
3620 case TEST_UNIT_READY:
3621 case VERIFY:
3622 case WRITE_FILEMARKS:
3623 case MOVE_MEDIUM:
3624 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3625 break;
3626 case REPORT_LUNS:
3627 cmd->transport_emulate_cdb =
3628 &transport_core_report_lun_response;
3629 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3630 /*
3631 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3632 * See spc4r17 section 5.3
3633 */
3634 if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3635 cmd->sam_task_attr = MSG_HEAD_TAG;
3636 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3637 break;
3638 default:
3639 printk(KERN_WARNING "TARGET_CORE[%s]: Unsupported SCSI Opcode"
3640 " 0x%02x, sending CHECK_CONDITION.\n",
3641 CMD_TFO(cmd)->get_fabric_name(), cdb[0]);
3642 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3643 goto out_unsupported_cdb;
3644 }
3645
3646 if (size != cmd->data_length) {
3647 printk(KERN_WARNING "TARGET_CORE[%s]: Expected Transfer Length:"
3648 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3649 " 0x%02x\n", CMD_TFO(cmd)->get_fabric_name(),
3650 cmd->data_length, size, cdb[0]);
3651
3652 cmd->cmd_spdtl = size;
3653
3654 if (cmd->data_direction == DMA_TO_DEVICE) {
3655 printk(KERN_ERR "Rejecting underflow/overflow"
3656 " WRITE data\n");
3657 goto out_invalid_cdb_field;
3658 }
3659 /*
3660 * Reject READ_* or WRITE_* with overflow/underflow for
3661 * type SCF_SCSI_DATA_SG_IO_CDB.
3662 */
3663 if (!(ret) && (DEV_ATTRIB(dev)->block_size != 512)) {
3664 printk(KERN_ERR "Failing OVERFLOW/UNDERFLOW for LBA op"
3665 " CDB on non 512-byte sector setup subsystem"
3666 " plugin: %s\n", TRANSPORT(dev)->name);
3667 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3668 goto out_invalid_cdb_field;
3669 }
3670
3671 if (size > cmd->data_length) {
3672 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3673 cmd->residual_count = (size - cmd->data_length);
3674 } else {
3675 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3676 cmd->residual_count = (cmd->data_length - size);
3677 }
3678 cmd->data_length = size;
3679 }
3680
3681 transport_set_supported_SAM_opcode(cmd);
3682 return ret;
3683
3684 out_unsupported_cdb:
3685 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3686 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3687 return -2;
3688 out_invalid_cdb_field:
3689 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3690 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3691 return -2;
3692 }
3693
3694 static inline void transport_release_tasks(struct se_cmd *);
3695
3696 /*
3697 * This function will copy a contiguous *src buffer into a destination
3698 * struct scatterlist array.
3699 */
3700 static void transport_memcpy_write_contig(
3701 struct se_cmd *cmd,
3702 struct scatterlist *sg_d,
3703 unsigned char *src)
3704 {
3705 u32 i = 0, length = 0, total_length = cmd->data_length;
3706 void *dst;
3707
3708 while (total_length) {
3709 length = sg_d[i].length;
3710
3711 if (length > total_length)
3712 length = total_length;
3713
3714 dst = sg_virt(&sg_d[i]);
3715
3716 memcpy(dst, src, length);
3717
3718 if (!(total_length -= length))
3719 return;
3720
3721 src += length;
3722 i++;
3723 }
3724 }
3725
3726 /*
3727 * This function will copy a struct scatterlist array *sg_s into a destination
3728 * contiguous *dst buffer.
3729 */
3730 static void transport_memcpy_read_contig(
3731 struct se_cmd *cmd,
3732 unsigned char *dst,
3733 struct scatterlist *sg_s)
3734 {
3735 u32 i = 0, length = 0, total_length = cmd->data_length;
3736 void *src;
3737
3738 while (total_length) {
3739 length = sg_s[i].length;
3740
3741 if (length > total_length)
3742 length = total_length;
3743
3744 src = sg_virt(&sg_s[i]);
3745
3746 memcpy(dst, src, length);
3747
3748 if (!(total_length -= length))
3749 return;
3750
3751 dst += length;
3752 i++;
3753 }
3754 }
3755
3756 static void transport_memcpy_se_mem_read_contig(
3757 struct se_cmd *cmd,
3758 unsigned char *dst,
3759 struct list_head *se_mem_list)
3760 {
3761 struct se_mem *se_mem;
3762 void *src;
3763 u32 length = 0, total_length = cmd->data_length;
3764
3765 list_for_each_entry(se_mem, se_mem_list, se_list) {
3766 length = se_mem->se_len;
3767
3768 if (length > total_length)
3769 length = total_length;
3770
3771 src = page_address(se_mem->se_page) + se_mem->se_off;
3772
3773 memcpy(dst, src, length);
3774
3775 if (!(total_length -= length))
3776 return;
3777
3778 dst += length;
3779 }
3780 }
3781
3782 /*
3783 * Called from transport_generic_complete_ok() and
3784 * transport_generic_request_failure() to determine which dormant/delayed
3785 * and ordered cmds need to have their tasks added to the execution queue.
3786 */
3787 static void transport_complete_task_attr(struct se_cmd *cmd)
3788 {
3789 struct se_device *dev = SE_DEV(cmd);
3790 struct se_cmd *cmd_p, *cmd_tmp;
3791 int new_active_tasks = 0;
3792
3793 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3794 atomic_dec(&dev->simple_cmds);
3795 smp_mb__after_atomic_dec();
3796 dev->dev_cur_ordered_id++;
3797 DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for"
3798 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3799 cmd->se_ordered_id);
3800 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3801 atomic_dec(&dev->dev_hoq_count);
3802 smp_mb__after_atomic_dec();
3803 dev->dev_cur_ordered_id++;
3804 DEBUG_STA("Incremented dev_cur_ordered_id: %u for"
3805 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3806 cmd->se_ordered_id);
3807 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3808 spin_lock(&dev->ordered_cmd_lock);
3809 list_del(&cmd->se_ordered_list);
3810 atomic_dec(&dev->dev_ordered_sync);
3811 smp_mb__after_atomic_dec();
3812 spin_unlock(&dev->ordered_cmd_lock);
3813
3814 dev->dev_cur_ordered_id++;
3815 DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:"
3816 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3817 }
3818 /*
3819 * Process all commands up to the last received
3820 * ORDERED task attribute which requires another blocking
3821 * boundary
3822 */
3823 spin_lock(&dev->delayed_cmd_lock);
3824 list_for_each_entry_safe(cmd_p, cmd_tmp,
3825 &dev->delayed_cmd_list, se_delayed_list) {
3826
3827 list_del(&cmd_p->se_delayed_list);
3828 spin_unlock(&dev->delayed_cmd_lock);
3829
3830 DEBUG_STA("Calling add_tasks() for"
3831 " cmd_p: 0x%02x Task Attr: 0x%02x"
3832 " Dormant -> Active, se_ordered_id: %u\n",
3833 T_TASK(cmd_p)->t_task_cdb[0],
3834 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3835
3836 transport_add_tasks_from_cmd(cmd_p);
3837 new_active_tasks++;
3838
3839 spin_lock(&dev->delayed_cmd_lock);
3840 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3841 break;
3842 }
3843 spin_unlock(&dev->delayed_cmd_lock);
3844 /*
3845 * If new tasks have become active, wake up the transport thread
3846 * to do the processing of the Active tasks.
3847 */
3848 if (new_active_tasks != 0)
3849 wake_up_interruptible(&dev->dev_queue_obj->thread_wq);
3850 }
3851
3852 static void transport_generic_complete_ok(struct se_cmd *cmd)
3853 {
3854 int reason = 0;
3855 /*
3856 * Check if we need to move delayed/dormant tasks from cmds on the
3857 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3858 * Attribute.
3859 */
3860 if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3861 transport_complete_task_attr(cmd);
3862 /*
3863 * Check if we need to retrieve a sense buffer from
3864 * the struct se_cmd in question.
3865 */
3866 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3867 if (transport_get_sense_data(cmd) < 0)
3868 reason = TCM_NON_EXISTENT_LUN;
3869
3870 /*
3871 * Only set when an struct se_task->task_scsi_status returned
3872 * a non GOOD status.
3873 */
3874 if (cmd->scsi_status) {
3875 transport_send_check_condition_and_sense(
3876 cmd, reason, 1);
3877 transport_lun_remove_cmd(cmd);
3878 transport_cmd_check_stop_to_fabric(cmd);
3879 return;
3880 }
3881 }
3882 /*
3883 * Check for a callback, used by amongst other things
3884 * XDWRITE_READ_10 emulation.
3885 */
3886 if (cmd->transport_complete_callback)
3887 cmd->transport_complete_callback(cmd);
3888
3889 switch (cmd->data_direction) {
3890 case DMA_FROM_DEVICE:
3891 spin_lock(&cmd->se_lun->lun_sep_lock);
3892 if (SE_LUN(cmd)->lun_sep) {
3893 SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
3894 cmd->data_length;
3895 }
3896 spin_unlock(&cmd->se_lun->lun_sep_lock);
3897 /*
3898 * If enabled by TCM fabirc module pre-registered SGL
3899 * memory, perform the memcpy() from the TCM internal
3900 * contigious buffer back to the original SGL.
3901 */
3902 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
3903 transport_memcpy_write_contig(cmd,
3904 T_TASK(cmd)->t_task_pt_sgl,
3905 T_TASK(cmd)->t_task_buf);
3906
3907 CMD_TFO(cmd)->queue_data_in(cmd);
3908 break;
3909 case DMA_TO_DEVICE:
3910 spin_lock(&cmd->se_lun->lun_sep_lock);
3911 if (SE_LUN(cmd)->lun_sep) {
3912 SE_LUN(cmd)->lun_sep->sep_stats.rx_data_octets +=
3913 cmd->data_length;
3914 }
3915 spin_unlock(&cmd->se_lun->lun_sep_lock);
3916 /*
3917 * Check if we need to send READ payload for BIDI-COMMAND
3918 */
3919 if (T_TASK(cmd)->t_mem_bidi_list != NULL) {
3920 spin_lock(&cmd->se_lun->lun_sep_lock);
3921 if (SE_LUN(cmd)->lun_sep) {
3922 SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
3923 cmd->data_length;
3924 }
3925 spin_unlock(&cmd->se_lun->lun_sep_lock);
3926 CMD_TFO(cmd)->queue_data_in(cmd);
3927 break;
3928 }
3929 /* Fall through for DMA_TO_DEVICE */
3930 case DMA_NONE:
3931 CMD_TFO(cmd)->queue_status(cmd);
3932 break;
3933 default:
3934 break;
3935 }
3936
3937 transport_lun_remove_cmd(cmd);
3938 transport_cmd_check_stop_to_fabric(cmd);
3939 }
3940
3941 static void transport_free_dev_tasks(struct se_cmd *cmd)
3942 {
3943 struct se_task *task, *task_tmp;
3944 unsigned long flags;
3945
3946 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
3947 list_for_each_entry_safe(task, task_tmp,
3948 &T_TASK(cmd)->t_task_list, t_list) {
3949 if (atomic_read(&task->task_active))
3950 continue;
3951
3952 kfree(task->task_sg_bidi);
3953 kfree(task->task_sg);
3954
3955 list_del(&task->t_list);
3956
3957 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
3958 if (task->se_dev)
3959 TRANSPORT(task->se_dev)->free_task(task);
3960 else
3961 printk(KERN_ERR "task[%u] - task->se_dev is NULL\n",
3962 task->task_no);
3963 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
3964 }
3965 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
3966 }
3967
3968 static inline void transport_free_pages(struct se_cmd *cmd)
3969 {
3970 struct se_mem *se_mem, *se_mem_tmp;
3971 int free_page = 1;
3972
3973 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3974 free_page = 0;
3975 if (cmd->se_dev->transport->do_se_mem_map)
3976 free_page = 0;
3977
3978 if (T_TASK(cmd)->t_task_buf) {
3979 kfree(T_TASK(cmd)->t_task_buf);
3980 T_TASK(cmd)->t_task_buf = NULL;
3981 return;
3982 }
3983
3984 /*
3985 * Caller will handle releasing of struct se_mem.
3986 */
3987 if (cmd->se_cmd_flags & SCF_CMD_PASSTHROUGH_NOALLOC)
3988 return;
3989
3990 if (!(T_TASK(cmd)->t_tasks_se_num))
3991 return;
3992
3993 list_for_each_entry_safe(se_mem, se_mem_tmp,
3994 T_TASK(cmd)->t_mem_list, se_list) {
3995 /*
3996 * We only release call __free_page(struct se_mem->se_page) when
3997 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3998 */
3999 if (free_page)
4000 __free_page(se_mem->se_page);
4001
4002 list_del(&se_mem->se_list);
4003 kmem_cache_free(se_mem_cache, se_mem);
4004 }
4005
4006 if (T_TASK(cmd)->t_mem_bidi_list && T_TASK(cmd)->t_tasks_se_bidi_num) {
4007 list_for_each_entry_safe(se_mem, se_mem_tmp,
4008 T_TASK(cmd)->t_mem_bidi_list, se_list) {
4009 /*
4010 * We only release call __free_page(struct se_mem->se_page) when
4011 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
4012 */
4013 if (free_page)
4014 __free_page(se_mem->se_page);
4015
4016 list_del(&se_mem->se_list);
4017 kmem_cache_free(se_mem_cache, se_mem);
4018 }
4019 }
4020
4021 kfree(T_TASK(cmd)->t_mem_bidi_list);
4022 T_TASK(cmd)->t_mem_bidi_list = NULL;
4023 kfree(T_TASK(cmd)->t_mem_list);
4024 T_TASK(cmd)->t_mem_list = NULL;
4025 T_TASK(cmd)->t_tasks_se_num = 0;
4026 }
4027
4028 static inline void transport_release_tasks(struct se_cmd *cmd)
4029 {
4030 transport_free_dev_tasks(cmd);
4031 }
4032
4033 static inline int transport_dec_and_check(struct se_cmd *cmd)
4034 {
4035 unsigned long flags;
4036
4037 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
4038 if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
4039 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_fe_count))) {
4040 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
4041 flags);
4042 return 1;
4043 }
4044 }
4045
4046 if (atomic_read(&T_TASK(cmd)->t_se_count)) {
4047 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_se_count))) {
4048 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
4049 flags);
4050 return 1;
4051 }
4052 }
4053 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4054
4055 return 0;
4056 }
4057
4058 static void transport_release_fe_cmd(struct se_cmd *cmd)
4059 {
4060 unsigned long flags;
4061
4062 if (transport_dec_and_check(cmd))
4063 return;
4064
4065 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
4066 if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
4067 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4068 goto free_pages;
4069 }
4070 atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
4071 transport_all_task_dev_remove_state(cmd);
4072 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4073
4074 transport_release_tasks(cmd);
4075 free_pages:
4076 transport_free_pages(cmd);
4077 transport_free_se_cmd(cmd);
4078 CMD_TFO(cmd)->release_cmd_direct(cmd);
4079 }
4080
4081 static int transport_generic_remove(
4082 struct se_cmd *cmd,
4083 int release_to_pool,
4084 int session_reinstatement)
4085 {
4086 unsigned long flags;
4087
4088 if (!(T_TASK(cmd)))
4089 goto release_cmd;
4090
4091 if (transport_dec_and_check(cmd)) {
4092 if (session_reinstatement) {
4093 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
4094 transport_all_task_dev_remove_state(cmd);
4095 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
4096 flags);
4097 }
4098 return 1;
4099 }
4100
4101 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
4102 if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
4103 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4104 goto free_pages;
4105 }
4106 atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
4107 transport_all_task_dev_remove_state(cmd);
4108 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
4109
4110 transport_release_tasks(cmd);
4111 free_pages:
4112 transport_free_pages(cmd);
4113
4114 release_cmd:
4115 if (release_to_pool) {
4116 transport_release_cmd_to_pool(cmd);
4117 } else {
4118 transport_free_se_cmd(cmd);
4119 CMD_TFO(cmd)->release_cmd_direct(cmd);
4120 }
4121
4122 return 0;
4123 }
4124
4125 /*
4126 * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map
4127 * @cmd: Associated se_cmd descriptor
4128 * @mem: SGL style memory for TCM WRITE / READ
4129 * @sg_mem_num: Number of SGL elements
4130 * @mem_bidi_in: SGL style memory for TCM BIDI READ
4131 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
4132 *
4133 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
4134 * of parameters.
4135 */
4136 int transport_generic_map_mem_to_cmd(
4137 struct se_cmd *cmd,
4138 struct scatterlist *mem,
4139 u32 sg_mem_num,
4140 struct scatterlist *mem_bidi_in,
4141 u32 sg_mem_bidi_num)
4142 {
4143 u32 se_mem_cnt_out = 0;
4144 int ret;
4145
4146 if (!(mem) || !(sg_mem_num))
4147 return 0;
4148 /*
4149 * Passed *mem will contain a list_head containing preformatted
4150 * struct se_mem elements...
4151 */
4152 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM)) {
4153 if ((mem_bidi_in) || (sg_mem_bidi_num)) {
4154 printk(KERN_ERR "SCF_CMD_PASSTHROUGH_NOALLOC not supported"
4155 " with BIDI-COMMAND\n");
4156 return -ENOSYS;
4157 }
4158
4159 T_TASK(cmd)->t_mem_list = (struct list_head *)mem;
4160 T_TASK(cmd)->t_tasks_se_num = sg_mem_num;
4161 cmd->se_cmd_flags |= SCF_CMD_PASSTHROUGH_NOALLOC;
4162 return 0;
4163 }
4164 /*
4165 * Otherwise, assume the caller is passing a struct scatterlist
4166 * array from include/linux/scatterlist.h
4167 */
4168 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
4169 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
4170 /*
4171 * For CDB using TCM struct se_mem linked list scatterlist memory
4172 * processed into a TCM struct se_subsystem_dev, we do the mapping
4173 * from the passed physical memory to struct se_mem->se_page here.
4174 */
4175 T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
4176 if (!(T_TASK(cmd)->t_mem_list))
4177 return -ENOMEM;
4178
4179 ret = transport_map_sg_to_mem(cmd,
4180 T_TASK(cmd)->t_mem_list, mem, &se_mem_cnt_out);
4181 if (ret < 0)
4182 return -ENOMEM;
4183
4184 T_TASK(cmd)->t_tasks_se_num = se_mem_cnt_out;
4185 /*
4186 * Setup BIDI READ list of struct se_mem elements
4187 */
4188 if ((mem_bidi_in) && (sg_mem_bidi_num)) {
4189 T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
4190 if (!(T_TASK(cmd)->t_mem_bidi_list)) {
4191 kfree(T_TASK(cmd)->t_mem_list);
4192 return -ENOMEM;
4193 }
4194 se_mem_cnt_out = 0;
4195
4196 ret = transport_map_sg_to_mem(cmd,
4197 T_TASK(cmd)->t_mem_bidi_list, mem_bidi_in,
4198 &se_mem_cnt_out);
4199 if (ret < 0) {
4200 kfree(T_TASK(cmd)->t_mem_list);
4201 return -ENOMEM;
4202 }
4203
4204 T_TASK(cmd)->t_tasks_se_bidi_num = se_mem_cnt_out;
4205 }
4206 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
4207
4208 } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
4209 if (mem_bidi_in || sg_mem_bidi_num) {
4210 printk(KERN_ERR "BIDI-Commands not supported using "
4211 "SCF_SCSI_CONTROL_NONSG_IO_CDB\n");
4212 return -ENOSYS;
4213 }
4214 /*
4215 * For incoming CDBs using a contiguous buffer internall with TCM,
4216 * save the passed struct scatterlist memory. After TCM storage object
4217 * processing has completed for this struct se_cmd, TCM core will call
4218 * transport_memcpy_[write,read]_contig() as necessary from
4219 * transport_generic_complete_ok() and transport_write_pending() in order
4220 * to copy the TCM buffer to/from the original passed *mem in SGL ->
4221 * struct scatterlist format.
4222 */
4223 cmd->se_cmd_flags |= SCF_PASSTHROUGH_CONTIG_TO_SG;
4224 T_TASK(cmd)->t_task_pt_sgl = mem;
4225 }
4226
4227 return 0;
4228 }
4229 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
4230
4231
4232 static inline long long transport_dev_end_lba(struct se_device *dev)
4233 {
4234 return dev->transport->get_blocks(dev) + 1;
4235 }
4236
4237 static int transport_get_sectors(struct se_cmd *cmd)
4238 {
4239 struct se_device *dev = SE_DEV(cmd);
4240
4241 T_TASK(cmd)->t_tasks_sectors =
4242 (cmd->data_length / DEV_ATTRIB(dev)->block_size);
4243 if (!(T_TASK(cmd)->t_tasks_sectors))
4244 T_TASK(cmd)->t_tasks_sectors = 1;
4245
4246 if (TRANSPORT(dev)->get_device_type(dev) != TYPE_DISK)
4247 return 0;
4248
4249 if ((T_TASK(cmd)->t_task_lba + T_TASK(cmd)->t_tasks_sectors) >
4250 transport_dev_end_lba(dev)) {
4251 printk(KERN_ERR "LBA: %llu Sectors: %u exceeds"
4252 " transport_dev_end_lba(): %llu\n",
4253 T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors,
4254 transport_dev_end_lba(dev));
4255 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4256 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
4257 return PYX_TRANSPORT_REQ_TOO_MANY_SECTORS;
4258 }
4259
4260 return 0;
4261 }
4262
4263 static int transport_new_cmd_obj(struct se_cmd *cmd)
4264 {
4265 struct se_device *dev = SE_DEV(cmd);
4266 u32 task_cdbs = 0, rc;
4267
4268 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
4269 task_cdbs++;
4270 T_TASK(cmd)->t_task_cdbs++;
4271 } else {
4272 int set_counts = 1;
4273
4274 /*
4275 * Setup any BIDI READ tasks and memory from
4276 * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks
4277 * are queued first for the non pSCSI passthrough case.
4278 */
4279 if ((T_TASK(cmd)->t_mem_bidi_list != NULL) &&
4280 (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
4281 rc = transport_generic_get_cdb_count(cmd,
4282 T_TASK(cmd)->t_task_lba,
4283 T_TASK(cmd)->t_tasks_sectors,
4284 DMA_FROM_DEVICE, T_TASK(cmd)->t_mem_bidi_list,
4285 set_counts);
4286 if (!(rc)) {
4287 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4288 cmd->scsi_sense_reason =
4289 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4290 return PYX_TRANSPORT_LU_COMM_FAILURE;
4291 }
4292 set_counts = 0;
4293 }
4294 /*
4295 * Setup the tasks and memory from T_TASK(cmd)->t_mem_list
4296 * Note for BIDI transfers this will contain the WRITE payload
4297 */
4298 task_cdbs = transport_generic_get_cdb_count(cmd,
4299 T_TASK(cmd)->t_task_lba,
4300 T_TASK(cmd)->t_tasks_sectors,
4301 cmd->data_direction, T_TASK(cmd)->t_mem_list,
4302 set_counts);
4303 if (!(task_cdbs)) {
4304 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4305 cmd->scsi_sense_reason =
4306 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4307 return PYX_TRANSPORT_LU_COMM_FAILURE;
4308 }
4309 T_TASK(cmd)->t_task_cdbs += task_cdbs;
4310
4311 #if 0
4312 printk(KERN_INFO "data_length: %u, LBA: %llu t_tasks_sectors:"
4313 " %u, t_task_cdbs: %u\n", obj_ptr, cmd->data_length,
4314 T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors,
4315 T_TASK(cmd)->t_task_cdbs);
4316 #endif
4317 }
4318
4319 atomic_set(&T_TASK(cmd)->t_task_cdbs_left, task_cdbs);
4320 atomic_set(&T_TASK(cmd)->t_task_cdbs_ex_left, task_cdbs);
4321 atomic_set(&T_TASK(cmd)->t_task_cdbs_timeout_left, task_cdbs);
4322 return 0;
4323 }
4324
4325 static struct list_head *transport_init_se_mem_list(void)
4326 {
4327 struct list_head *se_mem_list;
4328
4329 se_mem_list = kzalloc(sizeof(struct list_head), GFP_KERNEL);
4330 if (!(se_mem_list)) {
4331 printk(KERN_ERR "Unable to allocate memory for se_mem_list\n");
4332 return NULL;
4333 }
4334 INIT_LIST_HEAD(se_mem_list);
4335
4336 return se_mem_list;
4337 }
4338
4339 static int
4340 transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
4341 {
4342 unsigned char *buf;
4343 struct se_mem *se_mem;
4344
4345 T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
4346 if (!(T_TASK(cmd)->t_mem_list))
4347 return -ENOMEM;
4348
4349 /*
4350 * If the device uses memory mapping this is enough.
4351 */
4352 if (cmd->se_dev->transport->do_se_mem_map)
4353 return 0;
4354
4355 /*
4356 * Setup BIDI-COMMAND READ list of struct se_mem elements
4357 */
4358 if (T_TASK(cmd)->t_tasks_bidi) {
4359 T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
4360 if (!(T_TASK(cmd)->t_mem_bidi_list)) {
4361 kfree(T_TASK(cmd)->t_mem_list);
4362 return -ENOMEM;
4363 }
4364 }
4365
4366 while (length) {
4367 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4368 if (!(se_mem)) {
4369 printk(KERN_ERR "Unable to allocate struct se_mem\n");
4370 goto out;
4371 }
4372
4373 /* #warning FIXME Allocate contigous pages for struct se_mem elements */
4374 se_mem->se_page = alloc_pages(GFP_KERNEL, 0);
4375 if (!(se_mem->se_page)) {
4376 printk(KERN_ERR "alloc_pages() failed\n");
4377 goto out;
4378 }
4379
4380 buf = kmap_atomic(se_mem->se_page, KM_IRQ0);
4381 if (!(buf)) {
4382 printk(KERN_ERR "kmap_atomic() failed\n");
4383 goto out;
4384 }
4385 INIT_LIST_HEAD(&se_mem->se_list);
4386 se_mem->se_len = (length > dma_size) ? dma_size : length;
4387 memset(buf, 0, se_mem->se_len);
4388 kunmap_atomic(buf, KM_IRQ0);
4389
4390 list_add_tail(&se_mem->se_list, T_TASK(cmd)->t_mem_list);
4391 T_TASK(cmd)->t_tasks_se_num++;
4392
4393 DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)"
4394 " Offset(%u)\n", se_mem->se_page, se_mem->se_len,
4395 se_mem->se_off);
4396
4397 length -= se_mem->se_len;
4398 }
4399
4400 DEBUG_MEM("Allocated total struct se_mem elements(%u)\n",
4401 T_TASK(cmd)->t_tasks_se_num);
4402
4403 return 0;
4404 out:
4405 if (se_mem)
4406 __free_pages(se_mem->se_page, 0);
4407 kmem_cache_free(se_mem_cache, se_mem);
4408 return -1;
4409 }
4410
4411 u32 transport_calc_sg_num(
4412 struct se_task *task,
4413 struct se_mem *in_se_mem,
4414 u32 task_offset)
4415 {
4416 struct se_cmd *se_cmd = task->task_se_cmd;
4417 struct se_device *se_dev = SE_DEV(se_cmd);
4418 struct se_mem *se_mem = in_se_mem;
4419 struct target_core_fabric_ops *tfo = CMD_TFO(se_cmd);
4420 u32 sg_length, task_size = task->task_size, task_sg_num_padded;
4421
4422 while (task_size != 0) {
4423 DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)"
4424 " se_mem->se_off(%u) task_offset(%u)\n",
4425 se_mem->se_page, se_mem->se_len,
4426 se_mem->se_off, task_offset);
4427
4428 if (task_offset == 0) {
4429 if (task_size >= se_mem->se_len) {
4430 sg_length = se_mem->se_len;
4431
4432 if (!(list_is_last(&se_mem->se_list,
4433 T_TASK(se_cmd)->t_mem_list)))
4434 se_mem = list_entry(se_mem->se_list.next,
4435 struct se_mem, se_list);
4436 } else {
4437 sg_length = task_size;
4438 task_size -= sg_length;
4439 goto next;
4440 }
4441
4442 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4443 sg_length, task_size);
4444 } else {
4445 if ((se_mem->se_len - task_offset) > task_size) {
4446 sg_length = task_size;
4447 task_size -= sg_length;
4448 goto next;
4449 } else {
4450 sg_length = (se_mem->se_len - task_offset);
4451
4452 if (!(list_is_last(&se_mem->se_list,
4453 T_TASK(se_cmd)->t_mem_list)))
4454 se_mem = list_entry(se_mem->se_list.next,
4455 struct se_mem, se_list);
4456 }
4457
4458 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4459 sg_length, task_size);
4460
4461 task_offset = 0;
4462 }
4463 task_size -= sg_length;
4464 next:
4465 DEBUG_SC("task[%u] - Reducing task_size to(%u)\n",
4466 task->task_no, task_size);
4467
4468 task->task_sg_num++;
4469 }
4470 /*
4471 * Check if the fabric module driver is requesting that all
4472 * struct se_task->task_sg[] be chained together.. If so,
4473 * then allocate an extra padding SG entry for linking and
4474 * marking the end of the chained SGL.
4475 */
4476 if (tfo->task_sg_chaining) {
4477 task_sg_num_padded = (task->task_sg_num + 1);
4478 task->task_padded_sg = 1;
4479 } else
4480 task_sg_num_padded = task->task_sg_num;
4481
4482 task->task_sg = kzalloc(task_sg_num_padded *
4483 sizeof(struct scatterlist), GFP_KERNEL);
4484 if (!(task->task_sg)) {
4485 printk(KERN_ERR "Unable to allocate memory for"
4486 " task->task_sg\n");
4487 return 0;
4488 }
4489 sg_init_table(&task->task_sg[0], task_sg_num_padded);
4490 /*
4491 * Setup task->task_sg_bidi for SCSI READ payload for
4492 * TCM/pSCSI passthrough if present for BIDI-COMMAND
4493 */
4494 if ((T_TASK(se_cmd)->t_mem_bidi_list != NULL) &&
4495 (TRANSPORT(se_dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) {
4496 task->task_sg_bidi = kzalloc(task_sg_num_padded *
4497 sizeof(struct scatterlist), GFP_KERNEL);
4498 if (!(task->task_sg_bidi)) {
4499 printk(KERN_ERR "Unable to allocate memory for"
4500 " task->task_sg_bidi\n");
4501 return 0;
4502 }
4503 sg_init_table(&task->task_sg_bidi[0], task_sg_num_padded);
4504 }
4505 /*
4506 * For the chaining case, setup the proper end of SGL for the
4507 * initial submission struct task into struct se_subsystem_api.
4508 * This will be cleared later by transport_do_task_sg_chain()
4509 */
4510 if (task->task_padded_sg) {
4511 sg_mark_end(&task->task_sg[task->task_sg_num - 1]);
4512 /*
4513 * Added the 'if' check before marking end of bi-directional
4514 * scatterlist (which gets created only in case of request
4515 * (RD + WR).
4516 */
4517 if (task->task_sg_bidi)
4518 sg_mark_end(&task->task_sg_bidi[task->task_sg_num - 1]);
4519 }
4520
4521 DEBUG_SC("Successfully allocated task->task_sg_num(%u),"
4522 " task_sg_num_padded(%u)\n", task->task_sg_num,
4523 task_sg_num_padded);
4524
4525 return task->task_sg_num;
4526 }
4527
4528 static inline int transport_set_tasks_sectors_disk(
4529 struct se_task *task,
4530 struct se_device *dev,
4531 unsigned long long lba,
4532 u32 sectors,
4533 int *max_sectors_set)
4534 {
4535 if ((lba + sectors) > transport_dev_end_lba(dev)) {
4536 task->task_sectors = ((transport_dev_end_lba(dev) - lba) + 1);
4537
4538 if (task->task_sectors > DEV_ATTRIB(dev)->max_sectors) {
4539 task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
4540 *max_sectors_set = 1;
4541 }
4542 } else {
4543 if (sectors > DEV_ATTRIB(dev)->max_sectors) {
4544 task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
4545 *max_sectors_set = 1;
4546 } else
4547 task->task_sectors = sectors;
4548 }
4549
4550 return 0;
4551 }
4552
4553 static inline int transport_set_tasks_sectors_non_disk(
4554 struct se_task *task,
4555 struct se_device *dev,
4556 unsigned long long lba,
4557 u32 sectors,
4558 int *max_sectors_set)
4559 {
4560 if (sectors > DEV_ATTRIB(dev)->max_sectors) {
4561 task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
4562 *max_sectors_set = 1;
4563 } else
4564 task->task_sectors = sectors;
4565
4566 return 0;
4567 }
4568
4569 static inline int transport_set_tasks_sectors(
4570 struct se_task *task,
4571 struct se_device *dev,
4572 unsigned long long lba,
4573 u32 sectors,
4574 int *max_sectors_set)
4575 {
4576 return (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK) ?
4577 transport_set_tasks_sectors_disk(task, dev, lba, sectors,
4578 max_sectors_set) :
4579 transport_set_tasks_sectors_non_disk(task, dev, lba, sectors,
4580 max_sectors_set);
4581 }
4582
4583 static int transport_map_sg_to_mem(
4584 struct se_cmd *cmd,
4585 struct list_head *se_mem_list,
4586 void *in_mem,
4587 u32 *se_mem_cnt)
4588 {
4589 struct se_mem *se_mem;
4590 struct scatterlist *sg;
4591 u32 sg_count = 1, cmd_size = cmd->data_length;
4592
4593 if (!in_mem) {
4594 printk(KERN_ERR "No source scatterlist\n");
4595 return -1;
4596 }
4597 sg = (struct scatterlist *)in_mem;
4598
4599 while (cmd_size) {
4600 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4601 if (!(se_mem)) {
4602 printk(KERN_ERR "Unable to allocate struct se_mem\n");
4603 return -1;
4604 }
4605 INIT_LIST_HEAD(&se_mem->se_list);
4606 DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u"
4607 " sg_page: %p offset: %d length: %d\n", cmd_size,
4608 sg_page(sg), sg->offset, sg->length);
4609
4610 se_mem->se_page = sg_page(sg);
4611 se_mem->se_off = sg->offset;
4612
4613 if (cmd_size > sg->length) {
4614 se_mem->se_len = sg->length;
4615 sg = sg_next(sg);
4616 sg_count++;
4617 } else
4618 se_mem->se_len = cmd_size;
4619
4620 cmd_size -= se_mem->se_len;
4621
4622 DEBUG_MEM("sg_to_mem: *se_mem_cnt: %u cmd_size: %u\n",
4623 *se_mem_cnt, cmd_size);
4624 DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n",
4625 se_mem->se_page, se_mem->se_off, se_mem->se_len);
4626
4627 list_add_tail(&se_mem->se_list, se_mem_list);
4628 (*se_mem_cnt)++;
4629 }
4630
4631 DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments to(%u)"
4632 " struct se_mem\n", sg_count, *se_mem_cnt);
4633
4634 if (sg_count != *se_mem_cnt)
4635 BUG();
4636
4637 return 0;
4638 }
4639
4640 /* transport_map_mem_to_sg():
4641 *
4642 *
4643 */
4644 int transport_map_mem_to_sg(
4645 struct se_task *task,
4646 struct list_head *se_mem_list,
4647 void *in_mem,
4648 struct se_mem *in_se_mem,
4649 struct se_mem **out_se_mem,
4650 u32 *se_mem_cnt,
4651 u32 *task_offset)
4652 {
4653 struct se_cmd *se_cmd = task->task_se_cmd;
4654 struct se_mem *se_mem = in_se_mem;
4655 struct scatterlist *sg = (struct scatterlist *)in_mem;
4656 u32 task_size = task->task_size, sg_no = 0;
4657
4658 if (!sg) {
4659 printk(KERN_ERR "Unable to locate valid struct"
4660 " scatterlist pointer\n");
4661 return -1;
4662 }
4663
4664 while (task_size != 0) {
4665 /*
4666 * Setup the contigious array of scatterlists for
4667 * this struct se_task.
4668 */
4669 sg_assign_page(sg, se_mem->se_page);
4670
4671 if (*task_offset == 0) {
4672 sg->offset = se_mem->se_off;
4673
4674 if (task_size >= se_mem->se_len) {
4675 sg->length = se_mem->se_len;
4676
4677 if (!(list_is_last(&se_mem->se_list,
4678 T_TASK(se_cmd)->t_mem_list))) {
4679 se_mem = list_entry(se_mem->se_list.next,
4680 struct se_mem, se_list);
4681 (*se_mem_cnt)++;
4682 }
4683 } else {
4684 sg->length = task_size;
4685 /*
4686 * Determine if we need to calculate an offset
4687 * into the struct se_mem on the next go around..
4688 */
4689 task_size -= sg->length;
4690 if (!(task_size))
4691 *task_offset = sg->length;
4692
4693 goto next;
4694 }
4695
4696 } else {
4697 sg->offset = (*task_offset + se_mem->se_off);
4698
4699 if ((se_mem->se_len - *task_offset) > task_size) {
4700 sg->length = task_size;
4701 /*
4702 * Determine if we need to calculate an offset
4703 * into the struct se_mem on the next go around..
4704 */
4705 task_size -= sg->length;
4706 if (!(task_size))
4707 *task_offset += sg->length;
4708
4709 goto next;
4710 } else {
4711 sg->length = (se_mem->se_len - *task_offset);
4712
4713 if (!(list_is_last(&se_mem->se_list,
4714 T_TASK(se_cmd)->t_mem_list))) {
4715 se_mem = list_entry(se_mem->se_list.next,
4716 struct se_mem, se_list);
4717 (*se_mem_cnt)++;
4718 }
4719 }
4720
4721 *task_offset = 0;
4722 }
4723 task_size -= sg->length;
4724 next:
4725 DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing"
4726 " task_size to(%u), task_offset: %u\n", task->task_no, sg_no,
4727 sg_page(sg), sg->length, sg->offset, task_size, *task_offset);
4728
4729 sg_no++;
4730 if (!(task_size))
4731 break;
4732
4733 sg = sg_next(sg);
4734
4735 if (task_size > se_cmd->data_length)
4736 BUG();
4737 }
4738 *out_se_mem = se_mem;
4739
4740 DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)"
4741 " SGs\n", task->task_no, *se_mem_cnt, sg_no);
4742
4743 return 0;
4744 }
4745
4746 /*
4747 * This function can be used by HW target mode drivers to create a linked
4748 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4749 * This is intended to be called during the completion path by TCM Core
4750 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4751 */
4752 void transport_do_task_sg_chain(struct se_cmd *cmd)
4753 {
4754 struct scatterlist *sg_head = NULL, *sg_link = NULL, *sg_first = NULL;
4755 struct scatterlist *sg_head_cur = NULL, *sg_link_cur = NULL;
4756 struct scatterlist *sg, *sg_end = NULL, *sg_end_cur = NULL;
4757 struct se_task *task;
4758 struct target_core_fabric_ops *tfo = CMD_TFO(cmd);
4759 u32 task_sg_num = 0, sg_count = 0;
4760 int i;
4761
4762 if (tfo->task_sg_chaining == 0) {
4763 printk(KERN_ERR "task_sg_chaining is diabled for fabric module:"
4764 " %s\n", tfo->get_fabric_name());
4765 dump_stack();
4766 return;
4767 }
4768 /*
4769 * Walk the struct se_task list and setup scatterlist chains
4770 * for each contiguosly allocated struct se_task->task_sg[].
4771 */
4772 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
4773 if (!(task->task_sg) || !(task->task_padded_sg))
4774 continue;
4775
4776 if (sg_head && sg_link) {
4777 sg_head_cur = &task->task_sg[0];
4778 sg_link_cur = &task->task_sg[task->task_sg_num];
4779 /*
4780 * Either add chain or mark end of scatterlist
4781 */
4782 if (!(list_is_last(&task->t_list,
4783 &T_TASK(cmd)->t_task_list))) {
4784 /*
4785 * Clear existing SGL termination bit set in
4786 * transport_calc_sg_num(), see sg_mark_end()
4787 */
4788 sg_end_cur = &task->task_sg[task->task_sg_num - 1];
4789 sg_end_cur->page_link &= ~0x02;
4790
4791 sg_chain(sg_head, task_sg_num, sg_head_cur);
4792 sg_count += task->task_sg_num;
4793 task_sg_num = (task->task_sg_num + 1);
4794 } else {
4795 sg_chain(sg_head, task_sg_num, sg_head_cur);
4796 sg_count += task->task_sg_num;
4797 task_sg_num = task->task_sg_num;
4798 }
4799
4800 sg_head = sg_head_cur;
4801 sg_link = sg_link_cur;
4802 continue;
4803 }
4804 sg_head = sg_first = &task->task_sg[0];
4805 sg_link = &task->task_sg[task->task_sg_num];
4806 /*
4807 * Check for single task..
4808 */
4809 if (!(list_is_last(&task->t_list, &T_TASK(cmd)->t_task_list))) {
4810 /*
4811 * Clear existing SGL termination bit set in
4812 * transport_calc_sg_num(), see sg_mark_end()
4813 */
4814 sg_end = &task->task_sg[task->task_sg_num - 1];
4815 sg_end->page_link &= ~0x02;
4816 sg_count += task->task_sg_num;
4817 task_sg_num = (task->task_sg_num + 1);
4818 } else {
4819 sg_count += task->task_sg_num;
4820 task_sg_num = task->task_sg_num;
4821 }
4822 }
4823 /*
4824 * Setup the starting pointer and total t_tasks_sg_linked_no including
4825 * padding SGs for linking and to mark the end.
4826 */
4827 T_TASK(cmd)->t_tasks_sg_chained = sg_first;
4828 T_TASK(cmd)->t_tasks_sg_chained_no = sg_count;
4829
4830 DEBUG_CMD_M("Setup cmd: %p T_TASK(cmd)->t_tasks_sg_chained: %p and"
4831 " t_tasks_sg_chained_no: %u\n", cmd, T_TASK(cmd)->t_tasks_sg_chained,
4832 T_TASK(cmd)->t_tasks_sg_chained_no);
4833
4834 for_each_sg(T_TASK(cmd)->t_tasks_sg_chained, sg,
4835 T_TASK(cmd)->t_tasks_sg_chained_no, i) {
4836
4837 DEBUG_CMD_M("SG[%d]: %p page: %p length: %d offset: %d, magic: 0x%08x\n",
4838 i, sg, sg_page(sg), sg->length, sg->offset, sg->sg_magic);
4839 if (sg_is_chain(sg))
4840 DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg);
4841 if (sg_is_last(sg))
4842 DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg);
4843 }
4844 }
4845 EXPORT_SYMBOL(transport_do_task_sg_chain);
4846
4847 static int transport_do_se_mem_map(
4848 struct se_device *dev,
4849 struct se_task *task,
4850 struct list_head *se_mem_list,
4851 void *in_mem,
4852 struct se_mem *in_se_mem,
4853 struct se_mem **out_se_mem,
4854 u32 *se_mem_cnt,
4855 u32 *task_offset_in)
4856 {
4857 u32 task_offset = *task_offset_in;
4858 int ret = 0;
4859 /*
4860 * se_subsystem_api_t->do_se_mem_map is used when internal allocation
4861 * has been done by the transport plugin.
4862 */
4863 if (TRANSPORT(dev)->do_se_mem_map) {
4864 ret = TRANSPORT(dev)->do_se_mem_map(task, se_mem_list,
4865 in_mem, in_se_mem, out_se_mem, se_mem_cnt,
4866 task_offset_in);
4867 if (ret == 0)
4868 T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt;
4869
4870 return ret;
4871 }
4872
4873 BUG_ON(list_empty(se_mem_list));
4874 /*
4875 * This is the normal path for all normal non BIDI and BIDI-COMMAND
4876 * WRITE payloads.. If we need to do BIDI READ passthrough for
4877 * TCM/pSCSI the first call to transport_do_se_mem_map ->
4878 * transport_calc_sg_num() -> transport_map_mem_to_sg() will do the
4879 * allocation for task->task_sg_bidi, and the subsequent call to
4880 * transport_do_se_mem_map() from transport_generic_get_cdb_count()
4881 */
4882 if (!(task->task_sg_bidi)) {
4883 /*
4884 * Assume default that transport plugin speaks preallocated
4885 * scatterlists.
4886 */
4887 if (!(transport_calc_sg_num(task, in_se_mem, task_offset)))
4888 return -1;
4889 /*
4890 * struct se_task->task_sg now contains the struct scatterlist array.
4891 */
4892 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg,
4893 in_se_mem, out_se_mem, se_mem_cnt,
4894 task_offset_in);
4895 }
4896 /*
4897 * Handle the se_mem_list -> struct task->task_sg_bidi
4898 * memory map for the extra BIDI READ payload
4899 */
4900 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg_bidi,
4901 in_se_mem, out_se_mem, se_mem_cnt,
4902 task_offset_in);
4903 }
4904
4905 static u32 transport_generic_get_cdb_count(
4906 struct se_cmd *cmd,
4907 unsigned long long lba,
4908 u32 sectors,
4909 enum dma_data_direction data_direction,
4910 struct list_head *mem_list,
4911 int set_counts)
4912 {
4913 unsigned char *cdb = NULL;
4914 struct se_task *task;
4915 struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
4916 struct se_mem *se_mem_bidi = NULL, *se_mem_bidi_lout = NULL;
4917 struct se_device *dev = SE_DEV(cmd);
4918 int max_sectors_set = 0, ret;
4919 u32 task_offset_in = 0, se_mem_cnt = 0, se_mem_bidi_cnt = 0, task_cdbs = 0;
4920
4921 if (!mem_list) {
4922 printk(KERN_ERR "mem_list is NULL in transport_generic_get"
4923 "_cdb_count()\n");
4924 return 0;
4925 }
4926 /*
4927 * While using RAMDISK_DR backstores is the only case where
4928 * mem_list will ever be empty at this point.
4929 */
4930 if (!(list_empty(mem_list)))
4931 se_mem = list_entry(mem_list->next, struct se_mem, se_list);
4932 /*
4933 * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to
4934 * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation
4935 */
4936 if ((T_TASK(cmd)->t_mem_bidi_list != NULL) &&
4937 !(list_empty(T_TASK(cmd)->t_mem_bidi_list)) &&
4938 (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV))
4939 se_mem_bidi = list_entry(T_TASK(cmd)->t_mem_bidi_list->next,
4940 struct se_mem, se_list);
4941
4942 while (sectors) {
4943 DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n",
4944 CMD_TFO(cmd)->get_task_tag(cmd), lba, sectors,
4945 transport_dev_end_lba(dev));
4946
4947 task = transport_generic_get_task(cmd, data_direction);
4948 if (!(task))
4949 goto out;
4950
4951 transport_set_tasks_sectors(task, dev, lba, sectors,
4952 &max_sectors_set);
4953
4954 task->task_lba = lba;
4955 lba += task->task_sectors;
4956 sectors -= task->task_sectors;
4957 task->task_size = (task->task_sectors *
4958 DEV_ATTRIB(dev)->block_size);
4959
4960 cdb = TRANSPORT(dev)->get_cdb(task);
4961 if ((cdb)) {
4962 memcpy(cdb, T_TASK(cmd)->t_task_cdb,
4963 scsi_command_size(T_TASK(cmd)->t_task_cdb));
4964 cmd->transport_split_cdb(task->task_lba,
4965 &task->task_sectors, cdb);
4966 }
4967
4968 /*
4969 * Perform the SE OBJ plugin and/or Transport plugin specific
4970 * mapping for T_TASK(cmd)->t_mem_list. And setup the
4971 * task->task_sg and if necessary task->task_sg_bidi
4972 */
4973 ret = transport_do_se_mem_map(dev, task, mem_list,
4974 NULL, se_mem, &se_mem_lout, &se_mem_cnt,
4975 &task_offset_in);
4976 if (ret < 0)
4977 goto out;
4978
4979 se_mem = se_mem_lout;
4980 /*
4981 * Setup the T_TASK(cmd)->t_mem_bidi_list -> task->task_sg_bidi
4982 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI
4983 *
4984 * Note that the first call to transport_do_se_mem_map() above will
4985 * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map()
4986 * -> transport_calc_sg_num(), and the second here will do the
4987 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI.
4988 */
4989 if (task->task_sg_bidi != NULL) {
4990 ret = transport_do_se_mem_map(dev, task,
4991 T_TASK(cmd)->t_mem_bidi_list, NULL,
4992 se_mem_bidi, &se_mem_bidi_lout, &se_mem_bidi_cnt,
4993 &task_offset_in);
4994 if (ret < 0)
4995 goto out;
4996
4997 se_mem_bidi = se_mem_bidi_lout;
4998 }
4999 task_cdbs++;
5000
5001 DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
5002 task_cdbs, task->task_sg_num);
5003
5004 if (max_sectors_set) {
5005 max_sectors_set = 0;
5006 continue;
5007 }
5008
5009 if (!sectors)
5010 break;
5011 }
5012
5013 if (set_counts) {
5014 atomic_inc(&T_TASK(cmd)->t_fe_count);
5015 atomic_inc(&T_TASK(cmd)->t_se_count);
5016 }
5017
5018 DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
5019 CMD_TFO(cmd)->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE)
5020 ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs);
5021
5022 return task_cdbs;
5023 out:
5024 return 0;
5025 }
5026
5027 static int
5028 transport_map_control_cmd_to_task(struct se_cmd *cmd)
5029 {
5030 struct se_device *dev = SE_DEV(cmd);
5031 unsigned char *cdb;
5032 struct se_task *task;
5033 int ret;
5034
5035 task = transport_generic_get_task(cmd, cmd->data_direction);
5036 if (!task)
5037 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
5038
5039 cdb = TRANSPORT(dev)->get_cdb(task);
5040 if (cdb)
5041 memcpy(cdb, cmd->t_task->t_task_cdb,
5042 scsi_command_size(cmd->t_task->t_task_cdb));
5043
5044 task->task_size = cmd->data_length;
5045 task->task_sg_num =
5046 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) ? 1 : 0;
5047
5048 atomic_inc(&cmd->t_task->t_fe_count);
5049 atomic_inc(&cmd->t_task->t_se_count);
5050
5051 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
5052 struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
5053 u32 se_mem_cnt = 0, task_offset = 0;
5054
5055 if (!list_empty(T_TASK(cmd)->t_mem_list))
5056 se_mem = list_entry(T_TASK(cmd)->t_mem_list->next,
5057 struct se_mem, se_list);
5058
5059 ret = transport_do_se_mem_map(dev, task,
5060 cmd->t_task->t_mem_list, NULL, se_mem,
5061 &se_mem_lout, &se_mem_cnt, &task_offset);
5062 if (ret < 0)
5063 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
5064
5065 if (dev->transport->map_task_SG)
5066 return dev->transport->map_task_SG(task);
5067 return 0;
5068 } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
5069 if (dev->transport->map_task_non_SG)
5070 return dev->transport->map_task_non_SG(task);
5071 return 0;
5072 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
5073 if (dev->transport->cdb_none)
5074 return dev->transport->cdb_none(task);
5075 return 0;
5076 } else {
5077 BUG();
5078 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
5079 }
5080 }
5081
5082 /* transport_generic_new_cmd(): Called from transport_processing_thread()
5083 *
5084 * Allocate storage transport resources from a set of values predefined
5085 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
5086 * Any non zero return here is treated as an "out of resource' op here.
5087 */
5088 /*
5089 * Generate struct se_task(s) and/or their payloads for this CDB.
5090 */
5091 static int transport_generic_new_cmd(struct se_cmd *cmd)
5092 {
5093 struct se_portal_group *se_tpg;
5094 struct se_task *task;
5095 struct se_device *dev = SE_DEV(cmd);
5096 int ret = 0;
5097
5098 /*
5099 * Determine is the TCM fabric module has already allocated physical
5100 * memory, and is directly calling transport_generic_map_mem_to_cmd()
5101 * to setup beforehand the linked list of physical memory at
5102 * T_TASK(cmd)->t_mem_list of struct se_mem->se_page
5103 */
5104 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
5105 ret = transport_allocate_resources(cmd);
5106 if (ret < 0)
5107 return ret;
5108 }
5109
5110 ret = transport_get_sectors(cmd);
5111 if (ret < 0)
5112 return ret;
5113
5114 ret = transport_new_cmd_obj(cmd);
5115 if (ret < 0)
5116 return ret;
5117
5118 /*
5119 * Determine if the calling TCM fabric module is talking to
5120 * Linux/NET via kernel sockets and needs to allocate a
5121 * struct iovec array to complete the struct se_cmd
5122 */
5123 se_tpg = SE_LUN(cmd)->lun_sep->sep_tpg;
5124 if (TPG_TFO(se_tpg)->alloc_cmd_iovecs != NULL) {
5125 ret = TPG_TFO(se_tpg)->alloc_cmd_iovecs(cmd);
5126 if (ret < 0)
5127 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
5128 }
5129
5130 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
5131 list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
5132 if (atomic_read(&task->task_sent))
5133 continue;
5134 if (!dev->transport->map_task_SG)
5135 continue;
5136
5137 ret = dev->transport->map_task_SG(task);
5138 if (ret < 0)
5139 return ret;
5140 }
5141 } else {
5142 ret = transport_map_control_cmd_to_task(cmd);
5143 if (ret < 0)
5144 return ret;
5145 }
5146
5147 /*
5148 * For WRITEs, let the iSCSI Target RX Thread know its buffer is ready..
5149 * This WRITE struct se_cmd (and all of its associated struct se_task's)
5150 * will be added to the struct se_device execution queue after its WRITE
5151 * data has arrived. (ie: It gets handled by the transport processing
5152 * thread a second time)
5153 */
5154 if (cmd->data_direction == DMA_TO_DEVICE) {
5155 transport_add_tasks_to_state_queue(cmd);
5156 return transport_generic_write_pending(cmd);
5157 }
5158 /*
5159 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
5160 * to the execution queue.
5161 */
5162 transport_execute_tasks(cmd);
5163 return 0;
5164 }
5165
5166 /* transport_generic_process_write():
5167 *
5168 *
5169 */
5170 void transport_generic_process_write(struct se_cmd *cmd)
5171 {
5172 #if 0
5173 /*
5174 * Copy SCSI Presented DTL sector(s) from received buffers allocated to
5175 * original EDTL
5176 */
5177 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
5178 if (!T_TASK(cmd)->t_tasks_se_num) {
5179 unsigned char *dst, *buf =
5180 (unsigned char *)T_TASK(cmd)->t_task_buf;
5181
5182 dst = kzalloc(cmd->cmd_spdtl), GFP_KERNEL);
5183 if (!(dst)) {
5184 printk(KERN_ERR "Unable to allocate memory for"
5185 " WRITE underflow\n");
5186 transport_generic_request_failure(cmd, NULL,
5187 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
5188 return;
5189 }
5190 memcpy(dst, buf, cmd->cmd_spdtl);
5191
5192 kfree(T_TASK(cmd)->t_task_buf);
5193 T_TASK(cmd)->t_task_buf = dst;
5194 } else {
5195 struct scatterlist *sg =
5196 (struct scatterlist *sg)T_TASK(cmd)->t_task_buf;
5197 struct scatterlist *orig_sg;
5198
5199 orig_sg = kzalloc(sizeof(struct scatterlist) *
5200 T_TASK(cmd)->t_tasks_se_num,
5201 GFP_KERNEL))) {
5202 if (!(orig_sg)) {
5203 printk(KERN_ERR "Unable to allocate memory"
5204 " for WRITE underflow\n");
5205 transport_generic_request_failure(cmd, NULL,
5206 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
5207 return;
5208 }
5209
5210 memcpy(orig_sg, T_TASK(cmd)->t_task_buf,
5211 sizeof(struct scatterlist) *
5212 T_TASK(cmd)->t_tasks_se_num);
5213
5214 cmd->data_length = cmd->cmd_spdtl;
5215 /*
5216 * FIXME, clear out original struct se_task and state
5217 * information.
5218 */
5219 if (transport_generic_new_cmd(cmd) < 0) {
5220 transport_generic_request_failure(cmd, NULL,
5221 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
5222 kfree(orig_sg);
5223 return;
5224 }
5225
5226 transport_memcpy_write_sg(cmd, orig_sg);
5227 }
5228 }
5229 #endif
5230 transport_execute_tasks(cmd);
5231 }
5232 EXPORT_SYMBOL(transport_generic_process_write);
5233
5234 /* transport_generic_write_pending():
5235 *
5236 *
5237 */
5238 static int transport_generic_write_pending(struct se_cmd *cmd)
5239 {
5240 unsigned long flags;
5241 int ret;
5242
5243 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5244 cmd->t_state = TRANSPORT_WRITE_PENDING;
5245 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5246 /*
5247 * For the TCM control CDBs using a contiguous buffer, do the memcpy
5248 * from the passed Linux/SCSI struct scatterlist located at
5249 * T_TASK(se_cmd)->t_task_pt_buf to the contiguous buffer at
5250 * T_TASK(se_cmd)->t_task_buf.
5251 */
5252 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
5253 transport_memcpy_read_contig(cmd,
5254 T_TASK(cmd)->t_task_buf,
5255 T_TASK(cmd)->t_task_pt_sgl);
5256 /*
5257 * Clear the se_cmd for WRITE_PENDING status in order to set
5258 * T_TASK(cmd)->t_transport_active=0 so that transport_generic_handle_data
5259 * can be called from HW target mode interrupt code. This is safe
5260 * to be called with transport_off=1 before the CMD_TFO(cmd)->write_pending
5261 * because the se_cmd->se_lun pointer is not being cleared.
5262 */
5263 transport_cmd_check_stop(cmd, 1, 0);
5264
5265 /*
5266 * Call the fabric write_pending function here to let the
5267 * frontend know that WRITE buffers are ready.
5268 */
5269 ret = CMD_TFO(cmd)->write_pending(cmd);
5270 if (ret < 0)
5271 return ret;
5272
5273 return PYX_TRANSPORT_WRITE_PENDING;
5274 }
5275
5276 /* transport_release_cmd_to_pool():
5277 *
5278 *
5279 */
5280 void transport_release_cmd_to_pool(struct se_cmd *cmd)
5281 {
5282 BUG_ON(!T_TASK(cmd));
5283 BUG_ON(!CMD_TFO(cmd));
5284
5285 transport_free_se_cmd(cmd);
5286 CMD_TFO(cmd)->release_cmd_to_pool(cmd);
5287 }
5288 EXPORT_SYMBOL(transport_release_cmd_to_pool);
5289
5290 /* transport_generic_free_cmd():
5291 *
5292 * Called from processing frontend to release storage engine resources
5293 */
5294 void transport_generic_free_cmd(
5295 struct se_cmd *cmd,
5296 int wait_for_tasks,
5297 int release_to_pool,
5298 int session_reinstatement)
5299 {
5300 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) || !T_TASK(cmd))
5301 transport_release_cmd_to_pool(cmd);
5302 else {
5303 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
5304
5305 if (SE_LUN(cmd)) {
5306 #if 0
5307 printk(KERN_INFO "cmd: %p ITT: 0x%08x contains"
5308 " SE_LUN(cmd)\n", cmd,
5309 CMD_TFO(cmd)->get_task_tag(cmd));
5310 #endif
5311 transport_lun_remove_cmd(cmd);
5312 }
5313
5314 if (wait_for_tasks && cmd->transport_wait_for_tasks)
5315 cmd->transport_wait_for_tasks(cmd, 0, 0);
5316
5317 transport_free_dev_tasks(cmd);
5318
5319 transport_generic_remove(cmd, release_to_pool,
5320 session_reinstatement);
5321 }
5322 }
5323 EXPORT_SYMBOL(transport_generic_free_cmd);
5324
5325 static void transport_nop_wait_for_tasks(
5326 struct se_cmd *cmd,
5327 int remove_cmd,
5328 int session_reinstatement)
5329 {
5330 return;
5331 }
5332
5333 /* transport_lun_wait_for_tasks():
5334 *
5335 * Called from ConfigFS context to stop the passed struct se_cmd to allow
5336 * an struct se_lun to be successfully shutdown.
5337 */
5338 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
5339 {
5340 unsigned long flags;
5341 int ret;
5342 /*
5343 * If the frontend has already requested this struct se_cmd to
5344 * be stopped, we can safely ignore this struct se_cmd.
5345 */
5346 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5347 if (atomic_read(&T_TASK(cmd)->t_transport_stop)) {
5348 atomic_set(&T_TASK(cmd)->transport_lun_stop, 0);
5349 DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop =="
5350 " TRUE, skipping\n", CMD_TFO(cmd)->get_task_tag(cmd));
5351 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5352 transport_cmd_check_stop(cmd, 1, 0);
5353 return -1;
5354 }
5355 atomic_set(&T_TASK(cmd)->transport_lun_fe_stop, 1);
5356 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5357
5358 wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq);
5359
5360 ret = transport_stop_tasks_for_cmd(cmd);
5361
5362 DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:"
5363 " %d\n", cmd, T_TASK(cmd)->t_task_cdbs, ret);
5364 if (!ret) {
5365 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
5366 CMD_TFO(cmd)->get_task_tag(cmd));
5367 wait_for_completion(&T_TASK(cmd)->transport_lun_stop_comp);
5368 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
5369 CMD_TFO(cmd)->get_task_tag(cmd));
5370 }
5371 transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
5372
5373 return 0;
5374 }
5375
5376 /* #define DEBUG_CLEAR_LUN */
5377 #ifdef DEBUG_CLEAR_LUN
5378 #define DEBUG_CLEAR_L(x...) printk(KERN_INFO x)
5379 #else
5380 #define DEBUG_CLEAR_L(x...)
5381 #endif
5382
5383 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
5384 {
5385 struct se_cmd *cmd = NULL;
5386 unsigned long lun_flags, cmd_flags;
5387 /*
5388 * Do exception processing and return CHECK_CONDITION status to the
5389 * Initiator Port.
5390 */
5391 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5392 while (!list_empty_careful(&lun->lun_cmd_list)) {
5393 cmd = list_entry(lun->lun_cmd_list.next,
5394 struct se_cmd, se_lun_list);
5395 list_del(&cmd->se_lun_list);
5396
5397 if (!(T_TASK(cmd))) {
5398 printk(KERN_ERR "ITT: 0x%08x, T_TASK(cmd) = NULL"
5399 "[i,t]_state: %u/%u\n",
5400 CMD_TFO(cmd)->get_task_tag(cmd),
5401 CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state);
5402 BUG();
5403 }
5404 atomic_set(&T_TASK(cmd)->transport_lun_active, 0);
5405 /*
5406 * This will notify iscsi_target_transport.c:
5407 * transport_cmd_check_stop() that a LUN shutdown is in
5408 * progress for the iscsi_cmd_t.
5409 */
5410 spin_lock(&T_TASK(cmd)->t_state_lock);
5411 DEBUG_CLEAR_L("SE_LUN[%d] - Setting T_TASK(cmd)->transport"
5412 "_lun_stop for ITT: 0x%08x\n",
5413 SE_LUN(cmd)->unpacked_lun,
5414 CMD_TFO(cmd)->get_task_tag(cmd));
5415 atomic_set(&T_TASK(cmd)->transport_lun_stop, 1);
5416 spin_unlock(&T_TASK(cmd)->t_state_lock);
5417
5418 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5419
5420 if (!(SE_LUN(cmd))) {
5421 printk(KERN_ERR "ITT: 0x%08x, [i,t]_state: %u/%u\n",
5422 CMD_TFO(cmd)->get_task_tag(cmd),
5423 CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state);
5424 BUG();
5425 }
5426 /*
5427 * If the Storage engine still owns the iscsi_cmd_t, determine
5428 * and/or stop its context.
5429 */
5430 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport"
5431 "_lun_wait_for_tasks()\n", SE_LUN(cmd)->unpacked_lun,
5432 CMD_TFO(cmd)->get_task_tag(cmd));
5433
5434 if (transport_lun_wait_for_tasks(cmd, SE_LUN(cmd)) < 0) {
5435 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5436 continue;
5437 }
5438
5439 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
5440 "_wait_for_tasks(): SUCCESS\n",
5441 SE_LUN(cmd)->unpacked_lun,
5442 CMD_TFO(cmd)->get_task_tag(cmd));
5443
5444 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags);
5445 if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
5446 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
5447 goto check_cond;
5448 }
5449 atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
5450 transport_all_task_dev_remove_state(cmd);
5451 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
5452
5453 transport_free_dev_tasks(cmd);
5454 /*
5455 * The Storage engine stopped this struct se_cmd before it was
5456 * send to the fabric frontend for delivery back to the
5457 * Initiator Node. Return this SCSI CDB back with an
5458 * CHECK_CONDITION status.
5459 */
5460 check_cond:
5461 transport_send_check_condition_and_sense(cmd,
5462 TCM_NON_EXISTENT_LUN, 0);
5463 /*
5464 * If the fabric frontend is waiting for this iscsi_cmd_t to
5465 * be released, notify the waiting thread now that LU has
5466 * finished accessing it.
5467 */
5468 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags);
5469 if (atomic_read(&T_TASK(cmd)->transport_lun_fe_stop)) {
5470 DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for"
5471 " struct se_cmd: %p ITT: 0x%08x\n",
5472 lun->unpacked_lun,
5473 cmd, CMD_TFO(cmd)->get_task_tag(cmd));
5474
5475 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
5476 cmd_flags);
5477 transport_cmd_check_stop(cmd, 1, 0);
5478 complete(&T_TASK(cmd)->transport_lun_fe_stop_comp);
5479 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5480 continue;
5481 }
5482 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
5483 lun->unpacked_lun, CMD_TFO(cmd)->get_task_tag(cmd));
5484
5485 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
5486 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5487 }
5488 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5489 }
5490
5491 static int transport_clear_lun_thread(void *p)
5492 {
5493 struct se_lun *lun = (struct se_lun *)p;
5494
5495 __transport_clear_lun_from_sessions(lun);
5496 complete(&lun->lun_shutdown_comp);
5497
5498 return 0;
5499 }
5500
5501 int transport_clear_lun_from_sessions(struct se_lun *lun)
5502 {
5503 struct task_struct *kt;
5504
5505 kt = kthread_run(transport_clear_lun_thread, (void *)lun,
5506 "tcm_cl_%u", lun->unpacked_lun);
5507 if (IS_ERR(kt)) {
5508 printk(KERN_ERR "Unable to start clear_lun thread\n");
5509 return -1;
5510 }
5511 wait_for_completion(&lun->lun_shutdown_comp);
5512
5513 return 0;
5514 }
5515
5516 /* transport_generic_wait_for_tasks():
5517 *
5518 * Called from frontend or passthrough context to wait for storage engine
5519 * to pause and/or release frontend generated struct se_cmd.
5520 */
5521 static void transport_generic_wait_for_tasks(
5522 struct se_cmd *cmd,
5523 int remove_cmd,
5524 int session_reinstatement)
5525 {
5526 unsigned long flags;
5527
5528 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
5529 return;
5530
5531 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5532 /*
5533 * If we are already stopped due to an external event (ie: LUN shutdown)
5534 * sleep until the connection can have the passed struct se_cmd back.
5535 * The T_TASK(cmd)->transport_lun_stopped_sem will be upped by
5536 * transport_clear_lun_from_sessions() once the ConfigFS context caller
5537 * has completed its operation on the struct se_cmd.
5538 */
5539 if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) {
5540
5541 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping"
5542 " wait_for_completion(&T_TASK(cmd)transport_lun_fe"
5543 "_stop_comp); for ITT: 0x%08x\n",
5544 CMD_TFO(cmd)->get_task_tag(cmd));
5545 /*
5546 * There is a special case for WRITES where a FE exception +
5547 * LUN shutdown means ConfigFS context is still sleeping on
5548 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
5549 * We go ahead and up transport_lun_stop_comp just to be sure
5550 * here.
5551 */
5552 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5553 complete(&T_TASK(cmd)->transport_lun_stop_comp);
5554 wait_for_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp);
5555 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5556
5557 transport_all_task_dev_remove_state(cmd);
5558 /*
5559 * At this point, the frontend who was the originator of this
5560 * struct se_cmd, now owns the structure and can be released through
5561 * normal means below.
5562 */
5563 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped"
5564 " wait_for_completion(&T_TASK(cmd)transport_lun_fe_"
5565 "stop_comp); for ITT: 0x%08x\n",
5566 CMD_TFO(cmd)->get_task_tag(cmd));
5567
5568 atomic_set(&T_TASK(cmd)->transport_lun_stop, 0);
5569 }
5570 if (!atomic_read(&T_TASK(cmd)->t_transport_active) ||
5571 atomic_read(&T_TASK(cmd)->t_transport_aborted))
5572 goto remove;
5573
5574 atomic_set(&T_TASK(cmd)->t_transport_stop, 1);
5575
5576 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x"
5577 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
5578 " = TRUE\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd),
5579 CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state,
5580 cmd->deferred_t_state);
5581
5582 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5583
5584 wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq);
5585
5586 wait_for_completion(&T_TASK(cmd)->t_transport_stop_comp);
5587
5588 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5589 atomic_set(&T_TASK(cmd)->t_transport_active, 0);
5590 atomic_set(&T_TASK(cmd)->t_transport_stop, 0);
5591
5592 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion("
5593 "&T_TASK(cmd)->t_transport_stop_comp) for ITT: 0x%08x\n",
5594 CMD_TFO(cmd)->get_task_tag(cmd));
5595 remove:
5596 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5597 if (!remove_cmd)
5598 return;
5599
5600 transport_generic_free_cmd(cmd, 0, 0, session_reinstatement);
5601 }
5602
5603 static int transport_get_sense_codes(
5604 struct se_cmd *cmd,
5605 u8 *asc,
5606 u8 *ascq)
5607 {
5608 *asc = cmd->scsi_asc;
5609 *ascq = cmd->scsi_ascq;
5610
5611 return 0;
5612 }
5613
5614 static int transport_set_sense_codes(
5615 struct se_cmd *cmd,
5616 u8 asc,
5617 u8 ascq)
5618 {
5619 cmd->scsi_asc = asc;
5620 cmd->scsi_ascq = ascq;
5621
5622 return 0;
5623 }
5624
5625 int transport_send_check_condition_and_sense(
5626 struct se_cmd *cmd,
5627 u8 reason,
5628 int from_transport)
5629 {
5630 unsigned char *buffer = cmd->sense_buffer;
5631 unsigned long flags;
5632 int offset;
5633 u8 asc = 0, ascq = 0;
5634
5635 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5636 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
5637 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5638 return 0;
5639 }
5640 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
5641 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
5642
5643 if (!reason && from_transport)
5644 goto after_reason;
5645
5646 if (!from_transport)
5647 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
5648 /*
5649 * Data Segment and SenseLength of the fabric response PDU.
5650 *
5651 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
5652 * from include/scsi/scsi_cmnd.h
5653 */
5654 offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd,
5655 TRANSPORT_SENSE_BUFFER);
5656 /*
5657 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
5658 * SENSE KEY values from include/scsi/scsi.h
5659 */
5660 switch (reason) {
5661 case TCM_NON_EXISTENT_LUN:
5662 case TCM_UNSUPPORTED_SCSI_OPCODE:
5663 case TCM_SECTOR_COUNT_TOO_MANY:
5664 /* CURRENT ERROR */
5665 buffer[offset] = 0x70;
5666 /* ILLEGAL REQUEST */
5667 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5668 /* INVALID COMMAND OPERATION CODE */
5669 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
5670 break;
5671 case TCM_UNKNOWN_MODE_PAGE:
5672 /* CURRENT ERROR */
5673 buffer[offset] = 0x70;
5674 /* ILLEGAL REQUEST */
5675 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5676 /* INVALID FIELD IN CDB */
5677 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5678 break;
5679 case TCM_CHECK_CONDITION_ABORT_CMD:
5680 /* CURRENT ERROR */
5681 buffer[offset] = 0x70;
5682 /* ABORTED COMMAND */
5683 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5684 /* BUS DEVICE RESET FUNCTION OCCURRED */
5685 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
5686 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
5687 break;
5688 case TCM_INCORRECT_AMOUNT_OF_DATA:
5689 /* CURRENT ERROR */
5690 buffer[offset] = 0x70;
5691 /* ABORTED COMMAND */
5692 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5693 /* WRITE ERROR */
5694 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5695 /* NOT ENOUGH UNSOLICITED DATA */
5696 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
5697 break;
5698 case TCM_INVALID_CDB_FIELD:
5699 /* CURRENT ERROR */
5700 buffer[offset] = 0x70;
5701 /* ABORTED COMMAND */
5702 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5703 /* INVALID FIELD IN CDB */
5704 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5705 break;
5706 case TCM_INVALID_PARAMETER_LIST:
5707 /* CURRENT ERROR */
5708 buffer[offset] = 0x70;
5709 /* ABORTED COMMAND */
5710 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5711 /* INVALID FIELD IN PARAMETER LIST */
5712 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
5713 break;
5714 case TCM_UNEXPECTED_UNSOLICITED_DATA:
5715 /* CURRENT ERROR */
5716 buffer[offset] = 0x70;
5717 /* ABORTED COMMAND */
5718 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5719 /* WRITE ERROR */
5720 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5721 /* UNEXPECTED_UNSOLICITED_DATA */
5722 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
5723 break;
5724 case TCM_SERVICE_CRC_ERROR:
5725 /* CURRENT ERROR */
5726 buffer[offset] = 0x70;
5727 /* ABORTED COMMAND */
5728 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5729 /* PROTOCOL SERVICE CRC ERROR */
5730 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
5731 /* N/A */
5732 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
5733 break;
5734 case TCM_SNACK_REJECTED:
5735 /* CURRENT ERROR */
5736 buffer[offset] = 0x70;
5737 /* ABORTED COMMAND */
5738 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5739 /* READ ERROR */
5740 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
5741 /* FAILED RETRANSMISSION REQUEST */
5742 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
5743 break;
5744 case TCM_WRITE_PROTECTED:
5745 /* CURRENT ERROR */
5746 buffer[offset] = 0x70;
5747 /* DATA PROTECT */
5748 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
5749 /* WRITE PROTECTED */
5750 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
5751 break;
5752 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
5753 /* CURRENT ERROR */
5754 buffer[offset] = 0x70;
5755 /* UNIT ATTENTION */
5756 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
5757 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
5758 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5759 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5760 break;
5761 case TCM_CHECK_CONDITION_NOT_READY:
5762 /* CURRENT ERROR */
5763 buffer[offset] = 0x70;
5764 /* Not Ready */
5765 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
5766 transport_get_sense_codes(cmd, &asc, &ascq);
5767 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5768 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5769 break;
5770 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
5771 default:
5772 /* CURRENT ERROR */
5773 buffer[offset] = 0x70;
5774 /* ILLEGAL REQUEST */
5775 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5776 /* LOGICAL UNIT COMMUNICATION FAILURE */
5777 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
5778 break;
5779 }
5780 /*
5781 * This code uses linux/include/scsi/scsi.h SAM status codes!
5782 */
5783 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
5784 /*
5785 * Automatically padded, this value is encoded in the fabric's
5786 * data_length response PDU containing the SCSI defined sense data.
5787 */
5788 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
5789
5790 after_reason:
5791 CMD_TFO(cmd)->queue_status(cmd);
5792 return 0;
5793 }
5794 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
5795
5796 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
5797 {
5798 int ret = 0;
5799
5800 if (atomic_read(&T_TASK(cmd)->t_transport_aborted) != 0) {
5801 if (!(send_status) ||
5802 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
5803 return 1;
5804 #if 0
5805 printk(KERN_INFO "Sending delayed SAM_STAT_TASK_ABORTED"
5806 " status for CDB: 0x%02x ITT: 0x%08x\n",
5807 T_TASK(cmd)->t_task_cdb[0],
5808 CMD_TFO(cmd)->get_task_tag(cmd));
5809 #endif
5810 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
5811 CMD_TFO(cmd)->queue_status(cmd);
5812 ret = 1;
5813 }
5814 return ret;
5815 }
5816 EXPORT_SYMBOL(transport_check_aborted_status);
5817
5818 void transport_send_task_abort(struct se_cmd *cmd)
5819 {
5820 /*
5821 * If there are still expected incoming fabric WRITEs, we wait
5822 * until until they have completed before sending a TASK_ABORTED
5823 * response. This response with TASK_ABORTED status will be
5824 * queued back to fabric module by transport_check_aborted_status().
5825 */
5826 if (cmd->data_direction == DMA_TO_DEVICE) {
5827 if (CMD_TFO(cmd)->write_pending_status(cmd) != 0) {
5828 atomic_inc(&T_TASK(cmd)->t_transport_aborted);
5829 smp_mb__after_atomic_inc();
5830 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5831 transport_new_cmd_failure(cmd);
5832 return;
5833 }
5834 }
5835 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5836 #if 0
5837 printk(KERN_INFO "Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
5838 " ITT: 0x%08x\n", T_TASK(cmd)->t_task_cdb[0],
5839 CMD_TFO(cmd)->get_task_tag(cmd));
5840 #endif
5841 CMD_TFO(cmd)->queue_status(cmd);
5842 }
5843
5844 /* transport_generic_do_tmr():
5845 *
5846 *
5847 */
5848 int transport_generic_do_tmr(struct se_cmd *cmd)
5849 {
5850 struct se_cmd *ref_cmd;
5851 struct se_device *dev = SE_DEV(cmd);
5852 struct se_tmr_req *tmr = cmd->se_tmr_req;
5853 int ret;
5854
5855 switch (tmr->function) {
5856 case TMR_ABORT_TASK:
5857 ref_cmd = tmr->ref_cmd;
5858 tmr->response = TMR_FUNCTION_REJECTED;
5859 break;
5860 case TMR_ABORT_TASK_SET:
5861 case TMR_CLEAR_ACA:
5862 case TMR_CLEAR_TASK_SET:
5863 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
5864 break;
5865 case TMR_LUN_RESET:
5866 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
5867 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
5868 TMR_FUNCTION_REJECTED;
5869 break;
5870 case TMR_TARGET_WARM_RESET:
5871 tmr->response = TMR_FUNCTION_REJECTED;
5872 break;
5873 case TMR_TARGET_COLD_RESET:
5874 tmr->response = TMR_FUNCTION_REJECTED;
5875 break;
5876 default:
5877 printk(KERN_ERR "Uknown TMR function: 0x%02x.\n",
5878 tmr->function);
5879 tmr->response = TMR_FUNCTION_REJECTED;
5880 break;
5881 }
5882
5883 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
5884 CMD_TFO(cmd)->queue_tm_rsp(cmd);
5885
5886 transport_cmd_check_stop(cmd, 2, 0);
5887 return 0;
5888 }
5889
5890 /*
5891 * Called with spin_lock_irq(&dev->execute_task_lock); held
5892 *
5893 */
5894 static struct se_task *
5895 transport_get_task_from_state_list(struct se_device *dev)
5896 {
5897 struct se_task *task;
5898
5899 if (list_empty(&dev->state_task_list))
5900 return NULL;
5901
5902 list_for_each_entry(task, &dev->state_task_list, t_state_list)
5903 break;
5904
5905 list_del(&task->t_state_list);
5906 atomic_set(&task->task_state_active, 0);
5907
5908 return task;
5909 }
5910
5911 static void transport_processing_shutdown(struct se_device *dev)
5912 {
5913 struct se_cmd *cmd;
5914 struct se_queue_req *qr;
5915 struct se_task *task;
5916 u8 state;
5917 unsigned long flags;
5918 /*
5919 * Empty the struct se_device's struct se_task state list.
5920 */
5921 spin_lock_irqsave(&dev->execute_task_lock, flags);
5922 while ((task = transport_get_task_from_state_list(dev))) {
5923 if (!(TASK_CMD(task))) {
5924 printk(KERN_ERR "TASK_CMD(task) is NULL!\n");
5925 continue;
5926 }
5927 cmd = TASK_CMD(task);
5928
5929 if (!T_TASK(cmd)) {
5930 printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:"
5931 " %p ITT: 0x%08x\n", task, cmd,
5932 CMD_TFO(cmd)->get_task_tag(cmd));
5933 continue;
5934 }
5935 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5936
5937 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5938
5939 DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x,"
5940 " i_state/def_i_state: %d/%d, t_state/def_t_state:"
5941 " %d/%d cdb: 0x%02x\n", cmd, task,
5942 CMD_TFO(cmd)->get_task_tag(cmd), cmd->cmd_sn,
5943 CMD_TFO(cmd)->get_cmd_state(cmd), cmd->deferred_i_state,
5944 cmd->t_state, cmd->deferred_t_state,
5945 T_TASK(cmd)->t_task_cdb[0]);
5946 DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:"
5947 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5948 " t_transport_stop: %d t_transport_sent: %d\n",
5949 CMD_TFO(cmd)->get_task_tag(cmd),
5950 T_TASK(cmd)->t_task_cdbs,
5951 atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
5952 atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
5953 atomic_read(&T_TASK(cmd)->t_transport_active),
5954 atomic_read(&T_TASK(cmd)->t_transport_stop),
5955 atomic_read(&T_TASK(cmd)->t_transport_sent));
5956
5957 if (atomic_read(&task->task_active)) {
5958 atomic_set(&task->task_stop, 1);
5959 spin_unlock_irqrestore(
5960 &T_TASK(cmd)->t_state_lock, flags);
5961
5962 DEBUG_DO("Waiting for task: %p to shutdown for dev:"
5963 " %p\n", task, dev);
5964 wait_for_completion(&task->task_stop_comp);
5965 DEBUG_DO("Completed task: %p shutdown for dev: %p\n",
5966 task, dev);
5967
5968 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
5969 atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
5970
5971 atomic_set(&task->task_active, 0);
5972 atomic_set(&task->task_stop, 0);
5973 } else {
5974 if (atomic_read(&task->task_execute_queue) != 0)
5975 transport_remove_task_from_execute_queue(task, dev);
5976 }
5977 __transport_stop_task_timer(task, &flags);
5978
5979 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) {
5980 spin_unlock_irqrestore(
5981 &T_TASK(cmd)->t_state_lock, flags);
5982
5983 DEBUG_DO("Skipping task: %p, dev: %p for"
5984 " t_task_cdbs_ex_left: %d\n", task, dev,
5985 atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left));
5986
5987 spin_lock_irqsave(&dev->execute_task_lock, flags);
5988 continue;
5989 }
5990
5991 if (atomic_read(&T_TASK(cmd)->t_transport_active)) {
5992 DEBUG_DO("got t_transport_active = 1 for task: %p, dev:"
5993 " %p\n", task, dev);
5994
5995 if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
5996 spin_unlock_irqrestore(
5997 &T_TASK(cmd)->t_state_lock, flags);
5998 transport_send_check_condition_and_sense(
5999 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
6000 0);
6001 transport_remove_cmd_from_queue(cmd,
6002 SE_DEV(cmd)->dev_queue_obj);
6003
6004 transport_lun_remove_cmd(cmd);
6005 transport_cmd_check_stop(cmd, 1, 0);
6006 } else {
6007 spin_unlock_irqrestore(
6008 &T_TASK(cmd)->t_state_lock, flags);
6009
6010 transport_remove_cmd_from_queue(cmd,
6011 SE_DEV(cmd)->dev_queue_obj);
6012
6013 transport_lun_remove_cmd(cmd);
6014
6015 if (transport_cmd_check_stop(cmd, 1, 0))
6016 transport_generic_remove(cmd, 0, 0);
6017 }
6018
6019 spin_lock_irqsave(&dev->execute_task_lock, flags);
6020 continue;
6021 }
6022 DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n",
6023 task, dev);
6024
6025 if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
6026 spin_unlock_irqrestore(
6027 &T_TASK(cmd)->t_state_lock, flags);
6028 transport_send_check_condition_and_sense(cmd,
6029 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
6030 transport_remove_cmd_from_queue(cmd,
6031 SE_DEV(cmd)->dev_queue_obj);
6032
6033 transport_lun_remove_cmd(cmd);
6034 transport_cmd_check_stop(cmd, 1, 0);
6035 } else {
6036 spin_unlock_irqrestore(
6037 &T_TASK(cmd)->t_state_lock, flags);
6038
6039 transport_remove_cmd_from_queue(cmd,
6040 SE_DEV(cmd)->dev_queue_obj);
6041 transport_lun_remove_cmd(cmd);
6042
6043 if (transport_cmd_check_stop(cmd, 1, 0))
6044 transport_generic_remove(cmd, 0, 0);
6045 }
6046
6047 spin_lock_irqsave(&dev->execute_task_lock, flags);
6048 }
6049 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
6050 /*
6051 * Empty the struct se_device's struct se_cmd list.
6052 */
6053 spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
6054 while ((qr = __transport_get_qr_from_queue(dev->dev_queue_obj))) {
6055 spin_unlock_irqrestore(
6056 &dev->dev_queue_obj->cmd_queue_lock, flags);
6057 cmd = (struct se_cmd *)qr->cmd;
6058 state = qr->state;
6059 kfree(qr);
6060
6061 DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n",
6062 cmd, state);
6063
6064 if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
6065 transport_send_check_condition_and_sense(cmd,
6066 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
6067
6068 transport_lun_remove_cmd(cmd);
6069 transport_cmd_check_stop(cmd, 1, 0);
6070 } else {
6071 transport_lun_remove_cmd(cmd);
6072 if (transport_cmd_check_stop(cmd, 1, 0))
6073 transport_generic_remove(cmd, 0, 0);
6074 }
6075 spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
6076 }
6077 spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags);
6078 }
6079
6080 /* transport_processing_thread():
6081 *
6082 *
6083 */
6084 static int transport_processing_thread(void *param)
6085 {
6086 int ret, t_state;
6087 struct se_cmd *cmd;
6088 struct se_device *dev = (struct se_device *) param;
6089 struct se_queue_req *qr;
6090
6091 set_user_nice(current, -20);
6092
6093 while (!kthread_should_stop()) {
6094 ret = wait_event_interruptible(dev->dev_queue_obj->thread_wq,
6095 atomic_read(&dev->dev_queue_obj->queue_cnt) ||
6096 kthread_should_stop());
6097 if (ret < 0)
6098 goto out;
6099
6100 spin_lock_irq(&dev->dev_status_lock);
6101 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
6102 spin_unlock_irq(&dev->dev_status_lock);
6103 transport_processing_shutdown(dev);
6104 continue;
6105 }
6106 spin_unlock_irq(&dev->dev_status_lock);
6107
6108 get_cmd:
6109 __transport_execute_tasks(dev);
6110
6111 qr = transport_get_qr_from_queue(dev->dev_queue_obj);
6112 if (!(qr))
6113 continue;
6114
6115 cmd = (struct se_cmd *)qr->cmd;
6116 t_state = qr->state;
6117 kfree(qr);
6118
6119 switch (t_state) {
6120 case TRANSPORT_NEW_CMD_MAP:
6121 if (!(CMD_TFO(cmd)->new_cmd_map)) {
6122 printk(KERN_ERR "CMD_TFO(cmd)->new_cmd_map is"
6123 " NULL for TRANSPORT_NEW_CMD_MAP\n");
6124 BUG();
6125 }
6126 ret = CMD_TFO(cmd)->new_cmd_map(cmd);
6127 if (ret < 0) {
6128 cmd->transport_error_status = ret;
6129 transport_generic_request_failure(cmd, NULL,
6130 0, (cmd->data_direction !=
6131 DMA_TO_DEVICE));
6132 break;
6133 }
6134 /* Fall through */
6135 case TRANSPORT_NEW_CMD:
6136 ret = transport_generic_new_cmd(cmd);
6137 if (ret < 0) {
6138 cmd->transport_error_status = ret;
6139 transport_generic_request_failure(cmd, NULL,
6140 0, (cmd->data_direction !=
6141 DMA_TO_DEVICE));
6142 }
6143 break;
6144 case TRANSPORT_PROCESS_WRITE:
6145 transport_generic_process_write(cmd);
6146 break;
6147 case TRANSPORT_COMPLETE_OK:
6148 transport_stop_all_task_timers(cmd);
6149 transport_generic_complete_ok(cmd);
6150 break;
6151 case TRANSPORT_REMOVE:
6152 transport_generic_remove(cmd, 1, 0);
6153 break;
6154 case TRANSPORT_FREE_CMD_INTR:
6155 transport_generic_free_cmd(cmd, 0, 1, 0);
6156 break;
6157 case TRANSPORT_PROCESS_TMR:
6158 transport_generic_do_tmr(cmd);
6159 break;
6160 case TRANSPORT_COMPLETE_FAILURE:
6161 transport_generic_request_failure(cmd, NULL, 1, 1);
6162 break;
6163 case TRANSPORT_COMPLETE_TIMEOUT:
6164 transport_stop_all_task_timers(cmd);
6165 transport_generic_request_timeout(cmd);
6166 break;
6167 default:
6168 printk(KERN_ERR "Unknown t_state: %d deferred_t_state:"
6169 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
6170 " %u\n", t_state, cmd->deferred_t_state,
6171 CMD_TFO(cmd)->get_task_tag(cmd),
6172 CMD_TFO(cmd)->get_cmd_state(cmd),
6173 SE_LUN(cmd)->unpacked_lun);
6174 BUG();
6175 }
6176
6177 goto get_cmd;
6178 }
6179
6180 out:
6181 transport_release_all_cmds(dev);
6182 dev->process_thread = NULL;
6183 return 0;
6184 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree