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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[deliverable/linux.git] / drivers / target / target_core_device.c
1 /*******************************************************************************
2 * Filename: target_core_device.c (based on iscsi_target_device.c)
3 *
4 * This file contains the iSCSI Virtual Device and Disk Transport
5 * agnostic related functions.
6 *
7 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
8 * Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved.
9 * Copyright (c) 2007-2010 Rising Tide Systems
10 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 *
12 * Nicholas A. Bellinger <nab@kernel.org>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 *
28 ******************************************************************************/
29
30 #include <linux/net.h>
31 #include <linux/string.h>
32 #include <linux/delay.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
37 #include <linux/in.h>
38 #include <net/sock.h>
39 #include <net/tcp.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_device.h>
42
43 #include <target/target_core_base.h>
44 #include <target/target_core_device.h>
45 #include <target/target_core_tpg.h>
46 #include <target/target_core_transport.h>
47 #include <target/target_core_fabric_ops.h>
48
49 #include "target_core_alua.h"
50 #include "target_core_hba.h"
51 #include "target_core_pr.h"
52 #include "target_core_ua.h"
53
54 static void se_dev_start(struct se_device *dev);
55 static void se_dev_stop(struct se_device *dev);
56
57 int transport_get_lun_for_cmd(
58 struct se_cmd *se_cmd,
59 unsigned char *cdb,
60 u32 unpacked_lun)
61 {
62 struct se_dev_entry *deve;
63 struct se_lun *se_lun = NULL;
64 struct se_session *se_sess = SE_SESS(se_cmd);
65 unsigned long flags;
66 int read_only = 0;
67
68 spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
69 deve = se_cmd->se_deve =
70 &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
71 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
72 if (se_cmd) {
73 deve->total_cmds++;
74 deve->total_bytes += se_cmd->data_length;
75
76 if (se_cmd->data_direction == DMA_TO_DEVICE) {
77 if (deve->lun_flags &
78 TRANSPORT_LUNFLAGS_READ_ONLY) {
79 read_only = 1;
80 goto out;
81 }
82 deve->write_bytes += se_cmd->data_length;
83 } else if (se_cmd->data_direction ==
84 DMA_FROM_DEVICE) {
85 deve->read_bytes += se_cmd->data_length;
86 }
87 }
88 deve->deve_cmds++;
89
90 se_lun = se_cmd->se_lun = deve->se_lun;
91 se_cmd->pr_res_key = deve->pr_res_key;
92 se_cmd->orig_fe_lun = unpacked_lun;
93 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
94 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
95 }
96 out:
97 spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
98
99 if (!se_lun) {
100 if (read_only) {
101 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
102 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
103 printk("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
104 " Access for 0x%08x\n",
105 CMD_TFO(se_cmd)->get_fabric_name(),
106 unpacked_lun);
107 return -1;
108 } else {
109 /*
110 * Use the se_portal_group->tpg_virt_lun0 to allow for
111 * REPORT_LUNS, et al to be returned when no active
112 * MappedLUN=0 exists for this Initiator Port.
113 */
114 if (unpacked_lun != 0) {
115 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
116 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
117 printk("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
118 " Access for 0x%08x\n",
119 CMD_TFO(se_cmd)->get_fabric_name(),
120 unpacked_lun);
121 return -1;
122 }
123 /*
124 * Force WRITE PROTECT for virtual LUN 0
125 */
126 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
127 (se_cmd->data_direction != DMA_NONE)) {
128 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
129 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
130 return -1;
131 }
132 #if 0
133 printk("TARGET_CORE[%s]: Using virtual LUN0! :-)\n",
134 CMD_TFO(se_cmd)->get_fabric_name());
135 #endif
136 se_lun = se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
137 se_cmd->orig_fe_lun = 0;
138 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
139 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
140 }
141 }
142 /*
143 * Determine if the struct se_lun is online.
144 */
145 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
146 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
147 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
148 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
149 return -1;
150 }
151
152 {
153 struct se_device *dev = se_lun->lun_se_dev;
154 spin_lock_irq(&dev->stats_lock);
155 dev->num_cmds++;
156 if (se_cmd->data_direction == DMA_TO_DEVICE)
157 dev->write_bytes += se_cmd->data_length;
158 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
159 dev->read_bytes += se_cmd->data_length;
160 spin_unlock_irq(&dev->stats_lock);
161 }
162
163 /*
164 * Add the iscsi_cmd_t to the struct se_lun's cmd list. This list is used
165 * for tracking state of struct se_cmds during LUN shutdown events.
166 */
167 spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
168 list_add_tail(&se_cmd->se_lun_list, &se_lun->lun_cmd_list);
169 atomic_set(&T_TASK(se_cmd)->transport_lun_active, 1);
170 #if 0
171 printk(KERN_INFO "Adding ITT: 0x%08x to LUN LIST[%d]\n",
172 CMD_TFO(se_cmd)->get_task_tag(se_cmd), se_lun->unpacked_lun);
173 #endif
174 spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
175
176 return 0;
177 }
178 EXPORT_SYMBOL(transport_get_lun_for_cmd);
179
180 int transport_get_lun_for_tmr(
181 struct se_cmd *se_cmd,
182 u32 unpacked_lun)
183 {
184 struct se_device *dev = NULL;
185 struct se_dev_entry *deve;
186 struct se_lun *se_lun = NULL;
187 struct se_session *se_sess = SE_SESS(se_cmd);
188 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
189
190 spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
191 deve = se_cmd->se_deve =
192 &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
193 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
194 se_lun = se_cmd->se_lun = se_tmr->tmr_lun = deve->se_lun;
195 dev = se_tmr->tmr_dev = se_lun->lun_se_dev;
196 se_cmd->pr_res_key = deve->pr_res_key;
197 se_cmd->orig_fe_lun = unpacked_lun;
198 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
199 /* se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; */
200 }
201 spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
202
203 if (!se_lun) {
204 printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
205 " Access for 0x%08x\n",
206 CMD_TFO(se_cmd)->get_fabric_name(),
207 unpacked_lun);
208 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
209 return -1;
210 }
211 /*
212 * Determine if the struct se_lun is online.
213 */
214 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
215 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
216 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
217 return -1;
218 }
219
220 spin_lock(&dev->se_tmr_lock);
221 list_add_tail(&se_tmr->tmr_list, &dev->dev_tmr_list);
222 spin_unlock(&dev->se_tmr_lock);
223
224 return 0;
225 }
226 EXPORT_SYMBOL(transport_get_lun_for_tmr);
227
228 /*
229 * This function is called from core_scsi3_emulate_pro_register_and_move()
230 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
231 * when a matching rtpi is found.
232 */
233 struct se_dev_entry *core_get_se_deve_from_rtpi(
234 struct se_node_acl *nacl,
235 u16 rtpi)
236 {
237 struct se_dev_entry *deve;
238 struct se_lun *lun;
239 struct se_port *port;
240 struct se_portal_group *tpg = nacl->se_tpg;
241 u32 i;
242
243 spin_lock_irq(&nacl->device_list_lock);
244 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
245 deve = &nacl->device_list[i];
246
247 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
248 continue;
249
250 lun = deve->se_lun;
251 if (!(lun)) {
252 printk(KERN_ERR "%s device entries device pointer is"
253 " NULL, but Initiator has access.\n",
254 TPG_TFO(tpg)->get_fabric_name());
255 continue;
256 }
257 port = lun->lun_sep;
258 if (!(port)) {
259 printk(KERN_ERR "%s device entries device pointer is"
260 " NULL, but Initiator has access.\n",
261 TPG_TFO(tpg)->get_fabric_name());
262 continue;
263 }
264 if (port->sep_rtpi != rtpi)
265 continue;
266
267 atomic_inc(&deve->pr_ref_count);
268 smp_mb__after_atomic_inc();
269 spin_unlock_irq(&nacl->device_list_lock);
270
271 return deve;
272 }
273 spin_unlock_irq(&nacl->device_list_lock);
274
275 return NULL;
276 }
277
278 int core_free_device_list_for_node(
279 struct se_node_acl *nacl,
280 struct se_portal_group *tpg)
281 {
282 struct se_dev_entry *deve;
283 struct se_lun *lun;
284 u32 i;
285
286 if (!nacl->device_list)
287 return 0;
288
289 spin_lock_irq(&nacl->device_list_lock);
290 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
291 deve = &nacl->device_list[i];
292
293 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
294 continue;
295
296 if (!deve->se_lun) {
297 printk(KERN_ERR "%s device entries device pointer is"
298 " NULL, but Initiator has access.\n",
299 TPG_TFO(tpg)->get_fabric_name());
300 continue;
301 }
302 lun = deve->se_lun;
303
304 spin_unlock_irq(&nacl->device_list_lock);
305 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
306 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
307 spin_lock_irq(&nacl->device_list_lock);
308 }
309 spin_unlock_irq(&nacl->device_list_lock);
310
311 kfree(nacl->device_list);
312 nacl->device_list = NULL;
313
314 return 0;
315 }
316
317 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
318 {
319 struct se_dev_entry *deve;
320
321 spin_lock_irq(&se_nacl->device_list_lock);
322 deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
323 deve->deve_cmds--;
324 spin_unlock_irq(&se_nacl->device_list_lock);
325
326 return;
327 }
328
329 void core_update_device_list_access(
330 u32 mapped_lun,
331 u32 lun_access,
332 struct se_node_acl *nacl)
333 {
334 struct se_dev_entry *deve;
335
336 spin_lock_irq(&nacl->device_list_lock);
337 deve = &nacl->device_list[mapped_lun];
338 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
339 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
340 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
341 } else {
342 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
343 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
344 }
345 spin_unlock_irq(&nacl->device_list_lock);
346
347 return;
348 }
349
350 /* core_update_device_list_for_node():
351 *
352 *
353 */
354 int core_update_device_list_for_node(
355 struct se_lun *lun,
356 struct se_lun_acl *lun_acl,
357 u32 mapped_lun,
358 u32 lun_access,
359 struct se_node_acl *nacl,
360 struct se_portal_group *tpg,
361 int enable)
362 {
363 struct se_port *port = lun->lun_sep;
364 struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
365 int trans = 0;
366 /*
367 * If the MappedLUN entry is being disabled, the entry in
368 * port->sep_alua_list must be removed now before clearing the
369 * struct se_dev_entry pointers below as logic in
370 * core_alua_do_transition_tg_pt() depends on these being present.
371 */
372 if (!(enable)) {
373 /*
374 * deve->se_lun_acl will be NULL for demo-mode created LUNs
375 * that have not been explicitly concerted to MappedLUNs ->
376 * struct se_lun_acl, but we remove deve->alua_port_list from
377 * port->sep_alua_list. This also means that active UAs and
378 * NodeACL context specific PR metadata for demo-mode
379 * MappedLUN *deve will be released below..
380 */
381 spin_lock_bh(&port->sep_alua_lock);
382 list_del(&deve->alua_port_list);
383 spin_unlock_bh(&port->sep_alua_lock);
384 }
385
386 spin_lock_irq(&nacl->device_list_lock);
387 if (enable) {
388 /*
389 * Check if the call is handling demo mode -> explict LUN ACL
390 * transition. This transition must be for the same struct se_lun
391 * + mapped_lun that was setup in demo mode..
392 */
393 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
394 if (deve->se_lun_acl != NULL) {
395 printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
396 " already set for demo mode -> explict"
397 " LUN ACL transition\n");
398 spin_unlock_irq(&nacl->device_list_lock);
399 return -1;
400 }
401 if (deve->se_lun != lun) {
402 printk(KERN_ERR "struct se_dev_entry->se_lun does"
403 " match passed struct se_lun for demo mode"
404 " -> explict LUN ACL transition\n");
405 spin_unlock_irq(&nacl->device_list_lock);
406 return -1;
407 }
408 deve->se_lun_acl = lun_acl;
409 trans = 1;
410 } else {
411 deve->se_lun = lun;
412 deve->se_lun_acl = lun_acl;
413 deve->mapped_lun = mapped_lun;
414 deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
415 }
416
417 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
418 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
419 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
420 } else {
421 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
422 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
423 }
424
425 if (trans) {
426 spin_unlock_irq(&nacl->device_list_lock);
427 return 0;
428 }
429 deve->creation_time = get_jiffies_64();
430 deve->attach_count++;
431 spin_unlock_irq(&nacl->device_list_lock);
432
433 spin_lock_bh(&port->sep_alua_lock);
434 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
435 spin_unlock_bh(&port->sep_alua_lock);
436
437 return 0;
438 }
439 /*
440 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
441 * PR operation to complete.
442 */
443 spin_unlock_irq(&nacl->device_list_lock);
444 while (atomic_read(&deve->pr_ref_count) != 0)
445 cpu_relax();
446 spin_lock_irq(&nacl->device_list_lock);
447 /*
448 * Disable struct se_dev_entry LUN ACL mapping
449 */
450 core_scsi3_ua_release_all(deve);
451 deve->se_lun = NULL;
452 deve->se_lun_acl = NULL;
453 deve->lun_flags = 0;
454 deve->creation_time = 0;
455 deve->attach_count--;
456 spin_unlock_irq(&nacl->device_list_lock);
457
458 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
459 return 0;
460 }
461
462 /* core_clear_lun_from_tpg():
463 *
464 *
465 */
466 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
467 {
468 struct se_node_acl *nacl;
469 struct se_dev_entry *deve;
470 u32 i;
471
472 spin_lock_bh(&tpg->acl_node_lock);
473 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
474 spin_unlock_bh(&tpg->acl_node_lock);
475
476 spin_lock_irq(&nacl->device_list_lock);
477 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
478 deve = &nacl->device_list[i];
479 if (lun != deve->se_lun)
480 continue;
481 spin_unlock_irq(&nacl->device_list_lock);
482
483 core_update_device_list_for_node(lun, NULL,
484 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
485 nacl, tpg, 0);
486
487 spin_lock_irq(&nacl->device_list_lock);
488 }
489 spin_unlock_irq(&nacl->device_list_lock);
490
491 spin_lock_bh(&tpg->acl_node_lock);
492 }
493 spin_unlock_bh(&tpg->acl_node_lock);
494
495 return;
496 }
497
498 static struct se_port *core_alloc_port(struct se_device *dev)
499 {
500 struct se_port *port, *port_tmp;
501
502 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
503 if (!(port)) {
504 printk(KERN_ERR "Unable to allocate struct se_port\n");
505 return NULL;
506 }
507 INIT_LIST_HEAD(&port->sep_alua_list);
508 INIT_LIST_HEAD(&port->sep_list);
509 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
510 spin_lock_init(&port->sep_alua_lock);
511 mutex_init(&port->sep_tg_pt_md_mutex);
512
513 spin_lock(&dev->se_port_lock);
514 if (dev->dev_port_count == 0x0000ffff) {
515 printk(KERN_WARNING "Reached dev->dev_port_count =="
516 " 0x0000ffff\n");
517 spin_unlock(&dev->se_port_lock);
518 return NULL;
519 }
520 again:
521 /*
522 * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
523 * Here is the table from spc4r17 section 7.7.3.8.
524 *
525 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
526 *
527 * Code Description
528 * 0h Reserved
529 * 1h Relative port 1, historically known as port A
530 * 2h Relative port 2, historically known as port B
531 * 3h to FFFFh Relative port 3 through 65 535
532 */
533 port->sep_rtpi = dev->dev_rpti_counter++;
534 if (!(port->sep_rtpi))
535 goto again;
536
537 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
538 /*
539 * Make sure RELATIVE TARGET PORT IDENTIFER is unique
540 * for 16-bit wrap..
541 */
542 if (port->sep_rtpi == port_tmp->sep_rtpi)
543 goto again;
544 }
545 spin_unlock(&dev->se_port_lock);
546
547 return port;
548 }
549
550 static void core_export_port(
551 struct se_device *dev,
552 struct se_portal_group *tpg,
553 struct se_port *port,
554 struct se_lun *lun)
555 {
556 struct se_subsystem_dev *su_dev = SU_DEV(dev);
557 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
558
559 spin_lock(&dev->se_port_lock);
560 spin_lock(&lun->lun_sep_lock);
561 port->sep_tpg = tpg;
562 port->sep_lun = lun;
563 lun->lun_sep = port;
564 spin_unlock(&lun->lun_sep_lock);
565
566 list_add_tail(&port->sep_list, &dev->dev_sep_list);
567 spin_unlock(&dev->se_port_lock);
568
569 if (T10_ALUA(su_dev)->alua_type == SPC3_ALUA_EMULATED) {
570 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
571 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
572 printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
573 "_gp_member_t\n");
574 return;
575 }
576 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
577 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
578 T10_ALUA(su_dev)->default_tg_pt_gp);
579 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
580 printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
581 " Group: alua/default_tg_pt_gp\n",
582 TRANSPORT(dev)->name, TPG_TFO(tpg)->get_fabric_name());
583 }
584
585 dev->dev_port_count++;
586 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
587 }
588
589 /*
590 * Called with struct se_device->se_port_lock spinlock held.
591 */
592 static void core_release_port(struct se_device *dev, struct se_port *port)
593 __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
594 {
595 /*
596 * Wait for any port reference for PR ALL_TG_PT=1 operation
597 * to complete in __core_scsi3_alloc_registration()
598 */
599 spin_unlock(&dev->se_port_lock);
600 if (atomic_read(&port->sep_tg_pt_ref_cnt))
601 cpu_relax();
602 spin_lock(&dev->se_port_lock);
603
604 core_alua_free_tg_pt_gp_mem(port);
605
606 list_del(&port->sep_list);
607 dev->dev_port_count--;
608 kfree(port);
609
610 return;
611 }
612
613 int core_dev_export(
614 struct se_device *dev,
615 struct se_portal_group *tpg,
616 struct se_lun *lun)
617 {
618 struct se_port *port;
619
620 port = core_alloc_port(dev);
621 if (!(port))
622 return -1;
623
624 lun->lun_se_dev = dev;
625 se_dev_start(dev);
626
627 atomic_inc(&dev->dev_export_obj.obj_access_count);
628 core_export_port(dev, tpg, port, lun);
629 return 0;
630 }
631
632 void core_dev_unexport(
633 struct se_device *dev,
634 struct se_portal_group *tpg,
635 struct se_lun *lun)
636 {
637 struct se_port *port = lun->lun_sep;
638
639 spin_lock(&lun->lun_sep_lock);
640 if (lun->lun_se_dev == NULL) {
641 spin_unlock(&lun->lun_sep_lock);
642 return;
643 }
644 spin_unlock(&lun->lun_sep_lock);
645
646 spin_lock(&dev->se_port_lock);
647 atomic_dec(&dev->dev_export_obj.obj_access_count);
648 core_release_port(dev, port);
649 spin_unlock(&dev->se_port_lock);
650
651 se_dev_stop(dev);
652 lun->lun_se_dev = NULL;
653 }
654
655 int transport_core_report_lun_response(struct se_cmd *se_cmd)
656 {
657 struct se_dev_entry *deve;
658 struct se_lun *se_lun;
659 struct se_session *se_sess = SE_SESS(se_cmd);
660 struct se_task *se_task;
661 unsigned char *buf = (unsigned char *)T_TASK(se_cmd)->t_task_buf;
662 u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
663
664 list_for_each_entry(se_task, &T_TASK(se_cmd)->t_task_list, t_list)
665 break;
666
667 if (!(se_task)) {
668 printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
669 return PYX_TRANSPORT_LU_COMM_FAILURE;
670 }
671
672 /*
673 * If no struct se_session pointer is present, this struct se_cmd is
674 * coming via a target_core_mod PASSTHROUGH op, and not through
675 * a $FABRIC_MOD. In that case, report LUN=0 only.
676 */
677 if (!(se_sess)) {
678 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
679 lun_count = 1;
680 goto done;
681 }
682
683 spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
684 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
685 deve = &SE_NODE_ACL(se_sess)->device_list[i];
686 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
687 continue;
688 se_lun = deve->se_lun;
689 /*
690 * We determine the correct LUN LIST LENGTH even once we
691 * have reached the initial allocation length.
692 * See SPC2-R20 7.19.
693 */
694 lun_count++;
695 if ((cdb_offset + 8) >= se_cmd->data_length)
696 continue;
697
698 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
699 offset += 8;
700 cdb_offset += 8;
701 }
702 spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
703
704 /*
705 * See SPC3 r07, page 159.
706 */
707 done:
708 lun_count *= 8;
709 buf[0] = ((lun_count >> 24) & 0xff);
710 buf[1] = ((lun_count >> 16) & 0xff);
711 buf[2] = ((lun_count >> 8) & 0xff);
712 buf[3] = (lun_count & 0xff);
713
714 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
715 }
716
717 /* se_release_device_for_hba():
718 *
719 *
720 */
721 void se_release_device_for_hba(struct se_device *dev)
722 {
723 struct se_hba *hba = dev->se_hba;
724
725 if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
726 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
727 (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
728 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
729 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
730 se_dev_stop(dev);
731
732 if (dev->dev_ptr) {
733 kthread_stop(dev->process_thread);
734 if (dev->transport->free_device)
735 dev->transport->free_device(dev->dev_ptr);
736 }
737
738 spin_lock(&hba->device_lock);
739 list_del(&dev->dev_list);
740 hba->dev_count--;
741 spin_unlock(&hba->device_lock);
742
743 core_scsi3_free_all_registrations(dev);
744 se_release_vpd_for_dev(dev);
745
746 kfree(dev->dev_status_queue_obj);
747 kfree(dev->dev_queue_obj);
748 kfree(dev);
749
750 return;
751 }
752
753 void se_release_vpd_for_dev(struct se_device *dev)
754 {
755 struct t10_vpd *vpd, *vpd_tmp;
756
757 spin_lock(&DEV_T10_WWN(dev)->t10_vpd_lock);
758 list_for_each_entry_safe(vpd, vpd_tmp,
759 &DEV_T10_WWN(dev)->t10_vpd_list, vpd_list) {
760 list_del(&vpd->vpd_list);
761 kfree(vpd);
762 }
763 spin_unlock(&DEV_T10_WWN(dev)->t10_vpd_lock);
764
765 return;
766 }
767
768 /* se_free_virtual_device():
769 *
770 * Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
771 */
772 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
773 {
774 if (!list_empty(&dev->dev_sep_list))
775 dump_stack();
776
777 core_alua_free_lu_gp_mem(dev);
778 se_release_device_for_hba(dev);
779
780 return 0;
781 }
782
783 static void se_dev_start(struct se_device *dev)
784 {
785 struct se_hba *hba = dev->se_hba;
786
787 spin_lock(&hba->device_lock);
788 atomic_inc(&dev->dev_obj.obj_access_count);
789 if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
790 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
791 dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
792 dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
793 } else if (dev->dev_status &
794 TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
795 dev->dev_status &=
796 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
797 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
798 }
799 }
800 spin_unlock(&hba->device_lock);
801 }
802
803 static void se_dev_stop(struct se_device *dev)
804 {
805 struct se_hba *hba = dev->se_hba;
806
807 spin_lock(&hba->device_lock);
808 atomic_dec(&dev->dev_obj.obj_access_count);
809 if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
810 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
811 dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
812 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
813 } else if (dev->dev_status &
814 TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
815 dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
816 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
817 }
818 }
819 spin_unlock(&hba->device_lock);
820 }
821
822 int se_dev_check_online(struct se_device *dev)
823 {
824 int ret;
825
826 spin_lock_irq(&dev->dev_status_lock);
827 ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
828 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
829 spin_unlock_irq(&dev->dev_status_lock);
830
831 return ret;
832 }
833
834 int se_dev_check_shutdown(struct se_device *dev)
835 {
836 int ret;
837
838 spin_lock_irq(&dev->dev_status_lock);
839 ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
840 spin_unlock_irq(&dev->dev_status_lock);
841
842 return ret;
843 }
844
845 void se_dev_set_default_attribs(
846 struct se_device *dev,
847 struct se_dev_limits *dev_limits)
848 {
849 struct queue_limits *limits = &dev_limits->limits;
850
851 DEV_ATTRIB(dev)->emulate_dpo = DA_EMULATE_DPO;
852 DEV_ATTRIB(dev)->emulate_fua_write = DA_EMULATE_FUA_WRITE;
853 DEV_ATTRIB(dev)->emulate_fua_read = DA_EMULATE_FUA_READ;
854 DEV_ATTRIB(dev)->emulate_write_cache = DA_EMULATE_WRITE_CACHE;
855 DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
856 DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
857 DEV_ATTRIB(dev)->emulate_tpu = DA_EMULATE_TPU;
858 DEV_ATTRIB(dev)->emulate_tpws = DA_EMULATE_TPWS;
859 DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
860 DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
861 DEV_ATTRIB(dev)->enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
862 /*
863 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
864 * iblock_create_virtdevice() from struct queue_limits values
865 * if blk_queue_discard()==1
866 */
867 DEV_ATTRIB(dev)->max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
868 DEV_ATTRIB(dev)->max_unmap_block_desc_count =
869 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
870 DEV_ATTRIB(dev)->unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
871 DEV_ATTRIB(dev)->unmap_granularity_alignment =
872 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
873 /*
874 * block_size is based on subsystem plugin dependent requirements.
875 */
876 DEV_ATTRIB(dev)->hw_block_size = limits->logical_block_size;
877 DEV_ATTRIB(dev)->block_size = limits->logical_block_size;
878 /*
879 * max_sectors is based on subsystem plugin dependent requirements.
880 */
881 DEV_ATTRIB(dev)->hw_max_sectors = limits->max_hw_sectors;
882 DEV_ATTRIB(dev)->max_sectors = limits->max_sectors;
883 /*
884 * Set optimal_sectors from max_sectors, which can be lowered via
885 * configfs.
886 */
887 DEV_ATTRIB(dev)->optimal_sectors = limits->max_sectors;
888 /*
889 * queue_depth is based on subsystem plugin dependent requirements.
890 */
891 DEV_ATTRIB(dev)->hw_queue_depth = dev_limits->hw_queue_depth;
892 DEV_ATTRIB(dev)->queue_depth = dev_limits->queue_depth;
893 }
894
895 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
896 {
897 if (task_timeout > DA_TASK_TIMEOUT_MAX) {
898 printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
899 " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
900 return -1;
901 } else {
902 DEV_ATTRIB(dev)->task_timeout = task_timeout;
903 printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
904 dev, task_timeout);
905 }
906
907 return 0;
908 }
909
910 int se_dev_set_max_unmap_lba_count(
911 struct se_device *dev,
912 u32 max_unmap_lba_count)
913 {
914 DEV_ATTRIB(dev)->max_unmap_lba_count = max_unmap_lba_count;
915 printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
916 dev, DEV_ATTRIB(dev)->max_unmap_lba_count);
917 return 0;
918 }
919
920 int se_dev_set_max_unmap_block_desc_count(
921 struct se_device *dev,
922 u32 max_unmap_block_desc_count)
923 {
924 DEV_ATTRIB(dev)->max_unmap_block_desc_count = max_unmap_block_desc_count;
925 printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
926 dev, DEV_ATTRIB(dev)->max_unmap_block_desc_count);
927 return 0;
928 }
929
930 int se_dev_set_unmap_granularity(
931 struct se_device *dev,
932 u32 unmap_granularity)
933 {
934 DEV_ATTRIB(dev)->unmap_granularity = unmap_granularity;
935 printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
936 dev, DEV_ATTRIB(dev)->unmap_granularity);
937 return 0;
938 }
939
940 int se_dev_set_unmap_granularity_alignment(
941 struct se_device *dev,
942 u32 unmap_granularity_alignment)
943 {
944 DEV_ATTRIB(dev)->unmap_granularity_alignment = unmap_granularity_alignment;
945 printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
946 dev, DEV_ATTRIB(dev)->unmap_granularity_alignment);
947 return 0;
948 }
949
950 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
951 {
952 if ((flag != 0) && (flag != 1)) {
953 printk(KERN_ERR "Illegal value %d\n", flag);
954 return -1;
955 }
956 if (TRANSPORT(dev)->dpo_emulated == NULL) {
957 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated is NULL\n");
958 return -1;
959 }
960 if (TRANSPORT(dev)->dpo_emulated(dev) == 0) {
961 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated not supported\n");
962 return -1;
963 }
964 DEV_ATTRIB(dev)->emulate_dpo = flag;
965 printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
966 " bit: %d\n", dev, DEV_ATTRIB(dev)->emulate_dpo);
967 return 0;
968 }
969
970 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
971 {
972 if ((flag != 0) && (flag != 1)) {
973 printk(KERN_ERR "Illegal value %d\n", flag);
974 return -1;
975 }
976 if (TRANSPORT(dev)->fua_write_emulated == NULL) {
977 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated is NULL\n");
978 return -1;
979 }
980 if (TRANSPORT(dev)->fua_write_emulated(dev) == 0) {
981 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated not supported\n");
982 return -1;
983 }
984 DEV_ATTRIB(dev)->emulate_fua_write = flag;
985 printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
986 dev, DEV_ATTRIB(dev)->emulate_fua_write);
987 return 0;
988 }
989
990 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
991 {
992 if ((flag != 0) && (flag != 1)) {
993 printk(KERN_ERR "Illegal value %d\n", flag);
994 return -1;
995 }
996 if (TRANSPORT(dev)->fua_read_emulated == NULL) {
997 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated is NULL\n");
998 return -1;
999 }
1000 if (TRANSPORT(dev)->fua_read_emulated(dev) == 0) {
1001 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated not supported\n");
1002 return -1;
1003 }
1004 DEV_ATTRIB(dev)->emulate_fua_read = flag;
1005 printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
1006 dev, DEV_ATTRIB(dev)->emulate_fua_read);
1007 return 0;
1008 }
1009
1010 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1011 {
1012 if ((flag != 0) && (flag != 1)) {
1013 printk(KERN_ERR "Illegal value %d\n", flag);
1014 return -1;
1015 }
1016 if (TRANSPORT(dev)->write_cache_emulated == NULL) {
1017 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated is NULL\n");
1018 return -1;
1019 }
1020 if (TRANSPORT(dev)->write_cache_emulated(dev) == 0) {
1021 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated not supported\n");
1022 return -1;
1023 }
1024 DEV_ATTRIB(dev)->emulate_write_cache = flag;
1025 printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1026 dev, DEV_ATTRIB(dev)->emulate_write_cache);
1027 return 0;
1028 }
1029
1030 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1031 {
1032 if ((flag != 0) && (flag != 1) && (flag != 2)) {
1033 printk(KERN_ERR "Illegal value %d\n", flag);
1034 return -1;
1035 }
1036
1037 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1038 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1039 " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1040 " exists\n", dev,
1041 atomic_read(&dev->dev_export_obj.obj_access_count));
1042 return -1;
1043 }
1044 DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
1045 printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1046 dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
1047
1048 return 0;
1049 }
1050
1051 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1052 {
1053 if ((flag != 0) && (flag != 1)) {
1054 printk(KERN_ERR "Illegal value %d\n", flag);
1055 return -1;
1056 }
1057
1058 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1059 printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
1060 " dev_export_obj: %d count exists\n", dev,
1061 atomic_read(&dev->dev_export_obj.obj_access_count));
1062 return -1;
1063 }
1064 DEV_ATTRIB(dev)->emulate_tas = flag;
1065 printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1066 dev, (DEV_ATTRIB(dev)->emulate_tas) ? "Enabled" : "Disabled");
1067
1068 return 0;
1069 }
1070
1071 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1072 {
1073 if ((flag != 0) && (flag != 1)) {
1074 printk(KERN_ERR "Illegal value %d\n", flag);
1075 return -1;
1076 }
1077 /*
1078 * We expect this value to be non-zero when generic Block Layer
1079 * Discard supported is detected iblock_create_virtdevice().
1080 */
1081 if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1082 printk(KERN_ERR "Generic Block Discard not supported\n");
1083 return -ENOSYS;
1084 }
1085
1086 DEV_ATTRIB(dev)->emulate_tpu = flag;
1087 printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1088 dev, flag);
1089 return 0;
1090 }
1091
1092 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1093 {
1094 if ((flag != 0) && (flag != 1)) {
1095 printk(KERN_ERR "Illegal value %d\n", flag);
1096 return -1;
1097 }
1098 /*
1099 * We expect this value to be non-zero when generic Block Layer
1100 * Discard supported is detected iblock_create_virtdevice().
1101 */
1102 if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1103 printk(KERN_ERR "Generic Block Discard not supported\n");
1104 return -ENOSYS;
1105 }
1106
1107 DEV_ATTRIB(dev)->emulate_tpws = flag;
1108 printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1109 dev, flag);
1110 return 0;
1111 }
1112
1113 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1114 {
1115 if ((flag != 0) && (flag != 1)) {
1116 printk(KERN_ERR "Illegal value %d\n", flag);
1117 return -1;
1118 }
1119 DEV_ATTRIB(dev)->enforce_pr_isids = flag;
1120 printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1121 (DEV_ATTRIB(dev)->enforce_pr_isids) ? "Enabled" : "Disabled");
1122 return 0;
1123 }
1124
1125 /*
1126 * Note, this can only be called on unexported SE Device Object.
1127 */
1128 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1129 {
1130 u32 orig_queue_depth = dev->queue_depth;
1131
1132 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1133 printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
1134 " dev_export_obj: %d count exists\n", dev,
1135 atomic_read(&dev->dev_export_obj.obj_access_count));
1136 return -1;
1137 }
1138 if (!(queue_depth)) {
1139 printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
1140 "_depth\n", dev);
1141 return -1;
1142 }
1143
1144 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1145 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1146 printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
1147 " exceeds TCM/SE_Device TCQ: %u\n",
1148 dev, queue_depth,
1149 DEV_ATTRIB(dev)->hw_queue_depth);
1150 return -1;
1151 }
1152 } else {
1153 if (queue_depth > DEV_ATTRIB(dev)->queue_depth) {
1154 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1155 printk(KERN_ERR "dev[%p]: Passed queue_depth:"
1156 " %u exceeds TCM/SE_Device MAX"
1157 " TCQ: %u\n", dev, queue_depth,
1158 DEV_ATTRIB(dev)->hw_queue_depth);
1159 return -1;
1160 }
1161 }
1162 }
1163
1164 DEV_ATTRIB(dev)->queue_depth = dev->queue_depth = queue_depth;
1165 if (queue_depth > orig_queue_depth)
1166 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1167 else if (queue_depth < orig_queue_depth)
1168 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1169
1170 printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
1171 dev, queue_depth);
1172 return 0;
1173 }
1174
1175 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1176 {
1177 int force = 0; /* Force setting for VDEVS */
1178
1179 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1180 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1181 " max_sectors while dev_export_obj: %d count exists\n",
1182 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1183 return -1;
1184 }
1185 if (!(max_sectors)) {
1186 printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
1187 " max_sectors\n", dev);
1188 return -1;
1189 }
1190 if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1191 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
1192 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1193 DA_STATUS_MAX_SECTORS_MIN);
1194 return -1;
1195 }
1196 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1197 if (max_sectors > DEV_ATTRIB(dev)->hw_max_sectors) {
1198 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1199 " greater than TCM/SE_Device max_sectors:"
1200 " %u\n", dev, max_sectors,
1201 DEV_ATTRIB(dev)->hw_max_sectors);
1202 return -1;
1203 }
1204 } else {
1205 if (!(force) && (max_sectors >
1206 DEV_ATTRIB(dev)->hw_max_sectors)) {
1207 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1208 " greater than TCM/SE_Device max_sectors"
1209 ": %u, use force=1 to override.\n", dev,
1210 max_sectors, DEV_ATTRIB(dev)->hw_max_sectors);
1211 return -1;
1212 }
1213 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1214 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1215 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1216 " %u\n", dev, max_sectors,
1217 DA_STATUS_MAX_SECTORS_MAX);
1218 return -1;
1219 }
1220 }
1221
1222 DEV_ATTRIB(dev)->max_sectors = max_sectors;
1223 printk("dev[%p]: SE Device max_sectors changed to %u\n",
1224 dev, max_sectors);
1225 return 0;
1226 }
1227
1228 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1229 {
1230 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1231 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1232 " optimal_sectors while dev_export_obj: %d count exists\n",
1233 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1234 return -EINVAL;
1235 }
1236 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1237 printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
1238 " changed for TCM/pSCSI\n", dev);
1239 return -EINVAL;
1240 }
1241 if (optimal_sectors > DEV_ATTRIB(dev)->max_sectors) {
1242 printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
1243 " greater than max_sectors: %u\n", dev,
1244 optimal_sectors, DEV_ATTRIB(dev)->max_sectors);
1245 return -EINVAL;
1246 }
1247
1248 DEV_ATTRIB(dev)->optimal_sectors = optimal_sectors;
1249 printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
1250 dev, optimal_sectors);
1251 return 0;
1252 }
1253
1254 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1255 {
1256 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1257 printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
1258 " while dev_export_obj: %d count exists\n", dev,
1259 atomic_read(&dev->dev_export_obj.obj_access_count));
1260 return -1;
1261 }
1262
1263 if ((block_size != 512) &&
1264 (block_size != 1024) &&
1265 (block_size != 2048) &&
1266 (block_size != 4096)) {
1267 printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
1268 " for SE device, must be 512, 1024, 2048 or 4096\n",
1269 dev, block_size);
1270 return -1;
1271 }
1272
1273 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1274 printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
1275 " Physical Device, use for Linux/SCSI to change"
1276 " block_size for underlying hardware\n", dev);
1277 return -1;
1278 }
1279
1280 DEV_ATTRIB(dev)->block_size = block_size;
1281 printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
1282 dev, block_size);
1283 return 0;
1284 }
1285
1286 struct se_lun *core_dev_add_lun(
1287 struct se_portal_group *tpg,
1288 struct se_hba *hba,
1289 struct se_device *dev,
1290 u32 lun)
1291 {
1292 struct se_lun *lun_p;
1293 u32 lun_access = 0;
1294
1295 if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1296 printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
1297 atomic_read(&dev->dev_access_obj.obj_access_count));
1298 return NULL;
1299 }
1300
1301 lun_p = core_tpg_pre_addlun(tpg, lun);
1302 if ((IS_ERR(lun_p)) || !(lun_p))
1303 return NULL;
1304
1305 if (dev->dev_flags & DF_READ_ONLY)
1306 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1307 else
1308 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1309
1310 if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1311 return NULL;
1312
1313 printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1314 " CORE HBA: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1315 TPG_TFO(tpg)->tpg_get_tag(tpg), lun_p->unpacked_lun,
1316 TPG_TFO(tpg)->get_fabric_name(), hba->hba_id);
1317 /*
1318 * Update LUN maps for dynamically added initiators when
1319 * generate_node_acl is enabled.
1320 */
1321 if (TPG_TFO(tpg)->tpg_check_demo_mode(tpg)) {
1322 struct se_node_acl *acl;
1323 spin_lock_bh(&tpg->acl_node_lock);
1324 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1325 if (acl->dynamic_node_acl) {
1326 spin_unlock_bh(&tpg->acl_node_lock);
1327 core_tpg_add_node_to_devs(acl, tpg);
1328 spin_lock_bh(&tpg->acl_node_lock);
1329 }
1330 }
1331 spin_unlock_bh(&tpg->acl_node_lock);
1332 }
1333
1334 return lun_p;
1335 }
1336
1337 /* core_dev_del_lun():
1338 *
1339 *
1340 */
1341 int core_dev_del_lun(
1342 struct se_portal_group *tpg,
1343 u32 unpacked_lun)
1344 {
1345 struct se_lun *lun;
1346 int ret = 0;
1347
1348 lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1349 if (!(lun))
1350 return ret;
1351
1352 core_tpg_post_dellun(tpg, lun);
1353
1354 printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1355 " device object\n", TPG_TFO(tpg)->get_fabric_name(),
1356 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun,
1357 TPG_TFO(tpg)->get_fabric_name());
1358
1359 return 0;
1360 }
1361
1362 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1363 {
1364 struct se_lun *lun;
1365
1366 spin_lock(&tpg->tpg_lun_lock);
1367 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1368 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1369 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1370 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1371 TRANSPORT_MAX_LUNS_PER_TPG-1,
1372 TPG_TFO(tpg)->tpg_get_tag(tpg));
1373 spin_unlock(&tpg->tpg_lun_lock);
1374 return NULL;
1375 }
1376 lun = &tpg->tpg_lun_list[unpacked_lun];
1377
1378 if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1379 printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
1380 " Target Portal Group: %hu, ignoring request.\n",
1381 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1382 TPG_TFO(tpg)->tpg_get_tag(tpg));
1383 spin_unlock(&tpg->tpg_lun_lock);
1384 return NULL;
1385 }
1386 spin_unlock(&tpg->tpg_lun_lock);
1387
1388 return lun;
1389 }
1390
1391 /* core_dev_get_lun():
1392 *
1393 *
1394 */
1395 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1396 {
1397 struct se_lun *lun;
1398
1399 spin_lock(&tpg->tpg_lun_lock);
1400 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1401 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1402 "_TPG-1: %u for Target Portal Group: %hu\n",
1403 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1404 TRANSPORT_MAX_LUNS_PER_TPG-1,
1405 TPG_TFO(tpg)->tpg_get_tag(tpg));
1406 spin_unlock(&tpg->tpg_lun_lock);
1407 return NULL;
1408 }
1409 lun = &tpg->tpg_lun_list[unpacked_lun];
1410
1411 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1412 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1413 " Target Portal Group: %hu, ignoring request.\n",
1414 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1415 TPG_TFO(tpg)->tpg_get_tag(tpg));
1416 spin_unlock(&tpg->tpg_lun_lock);
1417 return NULL;
1418 }
1419 spin_unlock(&tpg->tpg_lun_lock);
1420
1421 return lun;
1422 }
1423
1424 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1425 struct se_portal_group *tpg,
1426 u32 mapped_lun,
1427 char *initiatorname,
1428 int *ret)
1429 {
1430 struct se_lun_acl *lacl;
1431 struct se_node_acl *nacl;
1432
1433 if (strlen(initiatorname) > TRANSPORT_IQN_LEN) {
1434 printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
1435 TPG_TFO(tpg)->get_fabric_name());
1436 *ret = -EOVERFLOW;
1437 return NULL;
1438 }
1439 nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1440 if (!(nacl)) {
1441 *ret = -EINVAL;
1442 return NULL;
1443 }
1444 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1445 if (!(lacl)) {
1446 printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
1447 *ret = -ENOMEM;
1448 return NULL;
1449 }
1450
1451 INIT_LIST_HEAD(&lacl->lacl_list);
1452 lacl->mapped_lun = mapped_lun;
1453 lacl->se_lun_nacl = nacl;
1454 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1455
1456 return lacl;
1457 }
1458
1459 int core_dev_add_initiator_node_lun_acl(
1460 struct se_portal_group *tpg,
1461 struct se_lun_acl *lacl,
1462 u32 unpacked_lun,
1463 u32 lun_access)
1464 {
1465 struct se_lun *lun;
1466 struct se_node_acl *nacl;
1467
1468 lun = core_dev_get_lun(tpg, unpacked_lun);
1469 if (!(lun)) {
1470 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1471 " Target Portal Group: %hu, ignoring request.\n",
1472 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1473 TPG_TFO(tpg)->tpg_get_tag(tpg));
1474 return -EINVAL;
1475 }
1476
1477 nacl = lacl->se_lun_nacl;
1478 if (!(nacl))
1479 return -EINVAL;
1480
1481 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1482 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1483 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1484
1485 lacl->se_lun = lun;
1486
1487 if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1488 lun_access, nacl, tpg, 1) < 0)
1489 return -EINVAL;
1490
1491 spin_lock(&lun->lun_acl_lock);
1492 list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1493 atomic_inc(&lun->lun_acl_count);
1494 smp_mb__after_atomic_inc();
1495 spin_unlock(&lun->lun_acl_lock);
1496
1497 printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1498 " InitiatorNode: %s\n", TPG_TFO(tpg)->get_fabric_name(),
1499 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1500 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1501 lacl->initiatorname);
1502 /*
1503 * Check to see if there are any existing persistent reservation APTPL
1504 * pre-registrations that need to be enabled for this LUN ACL..
1505 */
1506 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1507 return 0;
1508 }
1509
1510 /* core_dev_del_initiator_node_lun_acl():
1511 *
1512 *
1513 */
1514 int core_dev_del_initiator_node_lun_acl(
1515 struct se_portal_group *tpg,
1516 struct se_lun *lun,
1517 struct se_lun_acl *lacl)
1518 {
1519 struct se_node_acl *nacl;
1520
1521 nacl = lacl->se_lun_nacl;
1522 if (!(nacl))
1523 return -EINVAL;
1524
1525 spin_lock(&lun->lun_acl_lock);
1526 list_del(&lacl->lacl_list);
1527 atomic_dec(&lun->lun_acl_count);
1528 smp_mb__after_atomic_dec();
1529 spin_unlock(&lun->lun_acl_lock);
1530
1531 core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1532 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1533
1534 lacl->se_lun = NULL;
1535
1536 printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1537 " InitiatorNode: %s Mapped LUN: %u\n",
1538 TPG_TFO(tpg)->get_fabric_name(),
1539 TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
1540 lacl->initiatorname, lacl->mapped_lun);
1541
1542 return 0;
1543 }
1544
1545 void core_dev_free_initiator_node_lun_acl(
1546 struct se_portal_group *tpg,
1547 struct se_lun_acl *lacl)
1548 {
1549 printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1550 " Mapped LUN: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1551 TPG_TFO(tpg)->tpg_get_tag(tpg),
1552 TPG_TFO(tpg)->get_fabric_name(),
1553 lacl->initiatorname, lacl->mapped_lun);
1554
1555 kfree(lacl);
1556 }
1557
1558 int core_dev_setup_virtual_lun0(void)
1559 {
1560 struct se_hba *hba;
1561 struct se_device *dev;
1562 struct se_subsystem_dev *se_dev = NULL;
1563 struct se_subsystem_api *t;
1564 char buf[16];
1565 int ret;
1566
1567 hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
1568 if (IS_ERR(hba))
1569 return PTR_ERR(hba);
1570
1571 se_global->g_lun0_hba = hba;
1572 t = hba->transport;
1573
1574 se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1575 if (!(se_dev)) {
1576 printk(KERN_ERR "Unable to allocate memory for"
1577 " struct se_subsystem_dev\n");
1578 ret = -ENOMEM;
1579 goto out;
1580 }
1581 INIT_LIST_HEAD(&se_dev->g_se_dev_list);
1582 INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1583 spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1584 INIT_LIST_HEAD(&se_dev->t10_reservation.registration_list);
1585 INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
1586 spin_lock_init(&se_dev->t10_reservation.registration_lock);
1587 spin_lock_init(&se_dev->t10_reservation.aptpl_reg_lock);
1588 INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1589 spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1590 spin_lock_init(&se_dev->se_dev_lock);
1591 se_dev->t10_reservation.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1592 se_dev->t10_wwn.t10_sub_dev = se_dev;
1593 se_dev->t10_alua.t10_sub_dev = se_dev;
1594 se_dev->se_dev_attrib.da_sub_dev = se_dev;
1595 se_dev->se_dev_hba = hba;
1596
1597 se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1598 if (!(se_dev->se_dev_su_ptr)) {
1599 printk(KERN_ERR "Unable to locate subsystem dependent pointer"
1600 " from allocate_virtdevice()\n");
1601 ret = -ENOMEM;
1602 goto out;
1603 }
1604 se_global->g_lun0_su_dev = se_dev;
1605
1606 memset(buf, 0, 16);
1607 sprintf(buf, "rd_pages=8");
1608 t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1609
1610 dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1611 if (!(dev) || IS_ERR(dev)) {
1612 ret = -ENOMEM;
1613 goto out;
1614 }
1615 se_dev->se_dev_ptr = dev;
1616 se_global->g_lun0_dev = dev;
1617
1618 return 0;
1619 out:
1620 se_global->g_lun0_su_dev = NULL;
1621 kfree(se_dev);
1622 if (se_global->g_lun0_hba) {
1623 core_delete_hba(se_global->g_lun0_hba);
1624 se_global->g_lun0_hba = NULL;
1625 }
1626 return ret;
1627 }
1628
1629
1630 void core_dev_release_virtual_lun0(void)
1631 {
1632 struct se_hba *hba = se_global->g_lun0_hba;
1633 struct se_subsystem_dev *su_dev = se_global->g_lun0_su_dev;
1634
1635 if (!(hba))
1636 return;
1637
1638 if (se_global->g_lun0_dev)
1639 se_free_virtual_device(se_global->g_lun0_dev, hba);
1640
1641 kfree(su_dev);
1642 core_delete_hba(hba);
1643 }
Linux kernel - Deliverables
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