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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
[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 TCM 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 <linux/export.h>
39 #include <net/sock.h>
40 #include <net/tcp.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_device.h>
43
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47
48 #include "target_core_internal.h"
49 #include "target_core_alua.h"
50 #include "target_core_pr.h"
51 #include "target_core_ua.h"
52
53 static void se_dev_start(struct se_device *dev);
54 static void se_dev_stop(struct se_device *dev);
55
56 static struct se_hba *lun0_hba;
57 static struct se_subsystem_dev *lun0_su_dev;
58 /* not static, needed by tpg.c */
59 struct se_device *g_lun0_dev;
60
61 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
62 {
63 struct se_lun *se_lun = NULL;
64 struct se_session *se_sess = se_cmd->se_sess;
65 struct se_device *dev;
66 unsigned long flags;
67
68 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
69 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
70 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
71 return -ENODEV;
72 }
73
74 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
75 se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
76 if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
77 struct se_dev_entry *deve = se_cmd->se_deve;
78
79 deve->total_cmds++;
80 deve->total_bytes += se_cmd->data_length;
81
82 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
83 (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
84 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
85 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
86 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
87 " Access for 0x%08x\n",
88 se_cmd->se_tfo->get_fabric_name(),
89 unpacked_lun);
90 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
91 return -EACCES;
92 }
93
94 if (se_cmd->data_direction == DMA_TO_DEVICE)
95 deve->write_bytes += se_cmd->data_length;
96 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
97 deve->read_bytes += se_cmd->data_length;
98
99 deve->deve_cmds++;
100
101 se_lun = deve->se_lun;
102 se_cmd->se_lun = deve->se_lun;
103 se_cmd->pr_res_key = deve->pr_res_key;
104 se_cmd->orig_fe_lun = unpacked_lun;
105 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
106 }
107 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
108
109 if (!se_lun) {
110 /*
111 * Use the se_portal_group->tpg_virt_lun0 to allow for
112 * REPORT_LUNS, et al to be returned when no active
113 * MappedLUN=0 exists for this Initiator Port.
114 */
115 if (unpacked_lun != 0) {
116 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
117 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
118 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
119 " Access for 0x%08x\n",
120 se_cmd->se_tfo->get_fabric_name(),
121 unpacked_lun);
122 return -ENODEV;
123 }
124 /*
125 * Force WRITE PROTECT for virtual LUN 0
126 */
127 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
128 (se_cmd->data_direction != DMA_NONE)) {
129 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
130 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
131 return -EACCES;
132 }
133
134 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
135 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
136 se_cmd->orig_fe_lun = 0;
137 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
138 }
139 /*
140 * Determine if the struct se_lun is online.
141 * FIXME: Check for LUN_RESET + UNIT Attention
142 */
143 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
144 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
145 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
146 return -ENODEV;
147 }
148
149 /* Directly associate cmd with se_dev */
150 se_cmd->se_dev = se_lun->lun_se_dev;
151
152 /* TODO: get rid of this and use atomics for stats */
153 dev = se_lun->lun_se_dev;
154 spin_lock_irqsave(&dev->stats_lock, flags);
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_irqrestore(&dev->stats_lock, flags);
161
162 spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
163 list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
164 spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
165
166 return 0;
167 }
168 EXPORT_SYMBOL(transport_lookup_cmd_lun);
169
170 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
171 {
172 struct se_dev_entry *deve;
173 struct se_lun *se_lun = NULL;
174 struct se_session *se_sess = se_cmd->se_sess;
175 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
176 unsigned long flags;
177
178 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
179 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
180 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
181 return -ENODEV;
182 }
183
184 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
185 se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
186 deve = se_cmd->se_deve;
187
188 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
189 se_tmr->tmr_lun = deve->se_lun;
190 se_cmd->se_lun = deve->se_lun;
191 se_lun = deve->se_lun;
192 se_cmd->pr_res_key = deve->pr_res_key;
193 se_cmd->orig_fe_lun = unpacked_lun;
194 }
195 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
196
197 if (!se_lun) {
198 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
199 " Access for 0x%08x\n",
200 se_cmd->se_tfo->get_fabric_name(),
201 unpacked_lun);
202 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
203 return -ENODEV;
204 }
205 /*
206 * Determine if the struct se_lun is online.
207 * FIXME: Check for LUN_RESET + UNIT Attention
208 */
209 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
210 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
211 return -ENODEV;
212 }
213
214 /* Directly associate cmd with se_dev */
215 se_cmd->se_dev = se_lun->lun_se_dev;
216 se_tmr->tmr_dev = se_lun->lun_se_dev;
217
218 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
219 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
220 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
221
222 return 0;
223 }
224 EXPORT_SYMBOL(transport_lookup_tmr_lun);
225
226 /*
227 * This function is called from core_scsi3_emulate_pro_register_and_move()
228 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
229 * when a matching rtpi is found.
230 */
231 struct se_dev_entry *core_get_se_deve_from_rtpi(
232 struct se_node_acl *nacl,
233 u16 rtpi)
234 {
235 struct se_dev_entry *deve;
236 struct se_lun *lun;
237 struct se_port *port;
238 struct se_portal_group *tpg = nacl->se_tpg;
239 u32 i;
240
241 spin_lock_irq(&nacl->device_list_lock);
242 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
243 deve = nacl->device_list[i];
244
245 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
246 continue;
247
248 lun = deve->se_lun;
249 if (!lun) {
250 pr_err("%s device entries device pointer is"
251 " NULL, but Initiator has access.\n",
252 tpg->se_tpg_tfo->get_fabric_name());
253 continue;
254 }
255 port = lun->lun_sep;
256 if (!port) {
257 pr_err("%s device entries device pointer is"
258 " NULL, but Initiator has access.\n",
259 tpg->se_tpg_tfo->get_fabric_name());
260 continue;
261 }
262 if (port->sep_rtpi != rtpi)
263 continue;
264
265 atomic_inc(&deve->pr_ref_count);
266 smp_mb__after_atomic_inc();
267 spin_unlock_irq(&nacl->device_list_lock);
268
269 return deve;
270 }
271 spin_unlock_irq(&nacl->device_list_lock);
272
273 return NULL;
274 }
275
276 int core_free_device_list_for_node(
277 struct se_node_acl *nacl,
278 struct se_portal_group *tpg)
279 {
280 struct se_dev_entry *deve;
281 struct se_lun *lun;
282 u32 i;
283
284 if (!nacl->device_list)
285 return 0;
286
287 spin_lock_irq(&nacl->device_list_lock);
288 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
289 deve = nacl->device_list[i];
290
291 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
292 continue;
293
294 if (!deve->se_lun) {
295 pr_err("%s device entries device pointer is"
296 " NULL, but Initiator has access.\n",
297 tpg->se_tpg_tfo->get_fabric_name());
298 continue;
299 }
300 lun = deve->se_lun;
301
302 spin_unlock_irq(&nacl->device_list_lock);
303 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
304 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
305 spin_lock_irq(&nacl->device_list_lock);
306 }
307 spin_unlock_irq(&nacl->device_list_lock);
308
309 array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
310 nacl->device_list = NULL;
311
312 return 0;
313 }
314
315 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
316 {
317 struct se_dev_entry *deve;
318 unsigned long flags;
319
320 spin_lock_irqsave(&se_nacl->device_list_lock, flags);
321 deve = se_nacl->device_list[se_cmd->orig_fe_lun];
322 deve->deve_cmds--;
323 spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
324 }
325
326 void core_update_device_list_access(
327 u32 mapped_lun,
328 u32 lun_access,
329 struct se_node_acl *nacl)
330 {
331 struct se_dev_entry *deve;
332
333 spin_lock_irq(&nacl->device_list_lock);
334 deve = nacl->device_list[mapped_lun];
335 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
336 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
337 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
338 } else {
339 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
340 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
341 }
342 spin_unlock_irq(&nacl->device_list_lock);
343 }
344
345 /* core_enable_device_list_for_node():
346 *
347 *
348 */
349 int core_enable_device_list_for_node(
350 struct se_lun *lun,
351 struct se_lun_acl *lun_acl,
352 u32 mapped_lun,
353 u32 lun_access,
354 struct se_node_acl *nacl,
355 struct se_portal_group *tpg)
356 {
357 struct se_port *port = lun->lun_sep;
358 struct se_dev_entry *deve;
359
360 spin_lock_irq(&nacl->device_list_lock);
361
362 deve = nacl->device_list[mapped_lun];
363
364 /*
365 * Check if the call is handling demo mode -> explict LUN ACL
366 * transition. This transition must be for the same struct se_lun
367 * + mapped_lun that was setup in demo mode..
368 */
369 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
370 if (deve->se_lun_acl != NULL) {
371 pr_err("struct se_dev_entry->se_lun_acl"
372 " already set for demo mode -> explict"
373 " LUN ACL transition\n");
374 spin_unlock_irq(&nacl->device_list_lock);
375 return -EINVAL;
376 }
377 if (deve->se_lun != lun) {
378 pr_err("struct se_dev_entry->se_lun does"
379 " match passed struct se_lun for demo mode"
380 " -> explict LUN ACL transition\n");
381 spin_unlock_irq(&nacl->device_list_lock);
382 return -EINVAL;
383 }
384 deve->se_lun_acl = lun_acl;
385
386 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
387 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
388 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
389 } else {
390 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
391 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
392 }
393
394 spin_unlock_irq(&nacl->device_list_lock);
395 return 0;
396 }
397
398 deve->se_lun = lun;
399 deve->se_lun_acl = lun_acl;
400 deve->mapped_lun = mapped_lun;
401 deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
402
403 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
404 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
405 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
406 } else {
407 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
408 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
409 }
410
411 deve->creation_time = get_jiffies_64();
412 deve->attach_count++;
413 spin_unlock_irq(&nacl->device_list_lock);
414
415 spin_lock_bh(&port->sep_alua_lock);
416 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
417 spin_unlock_bh(&port->sep_alua_lock);
418
419 return 0;
420 }
421
422 /* core_disable_device_list_for_node():
423 *
424 *
425 */
426 int core_disable_device_list_for_node(
427 struct se_lun *lun,
428 struct se_lun_acl *lun_acl,
429 u32 mapped_lun,
430 u32 lun_access,
431 struct se_node_acl *nacl,
432 struct se_portal_group *tpg)
433 {
434 struct se_port *port = lun->lun_sep;
435 struct se_dev_entry *deve = nacl->device_list[mapped_lun];
436
437 /*
438 * If the MappedLUN entry is being disabled, the entry in
439 * port->sep_alua_list must be removed now before clearing the
440 * struct se_dev_entry pointers below as logic in
441 * core_alua_do_transition_tg_pt() depends on these being present.
442 *
443 * deve->se_lun_acl will be NULL for demo-mode created LUNs
444 * that have not been explicitly converted to MappedLUNs ->
445 * struct se_lun_acl, but we remove deve->alua_port_list from
446 * port->sep_alua_list. This also means that active UAs and
447 * NodeACL context specific PR metadata for demo-mode
448 * MappedLUN *deve will be released below..
449 */
450 spin_lock_bh(&port->sep_alua_lock);
451 list_del(&deve->alua_port_list);
452 spin_unlock_bh(&port->sep_alua_lock);
453 /*
454 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
455 * PR operation to complete.
456 */
457 while (atomic_read(&deve->pr_ref_count) != 0)
458 cpu_relax();
459
460 spin_lock_irq(&nacl->device_list_lock);
461 /*
462 * Disable struct se_dev_entry LUN ACL mapping
463 */
464 core_scsi3_ua_release_all(deve);
465 deve->se_lun = NULL;
466 deve->se_lun_acl = NULL;
467 deve->lun_flags = 0;
468 deve->creation_time = 0;
469 deve->attach_count--;
470 spin_unlock_irq(&nacl->device_list_lock);
471
472 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
473 return 0;
474 }
475
476 /* core_clear_lun_from_tpg():
477 *
478 *
479 */
480 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
481 {
482 struct se_node_acl *nacl;
483 struct se_dev_entry *deve;
484 u32 i;
485
486 spin_lock_irq(&tpg->acl_node_lock);
487 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
488 spin_unlock_irq(&tpg->acl_node_lock);
489
490 spin_lock_irq(&nacl->device_list_lock);
491 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
492 deve = nacl->device_list[i];
493 if (lun != deve->se_lun)
494 continue;
495 spin_unlock_irq(&nacl->device_list_lock);
496
497 core_disable_device_list_for_node(lun, NULL,
498 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
499 nacl, tpg);
500
501 spin_lock_irq(&nacl->device_list_lock);
502 }
503 spin_unlock_irq(&nacl->device_list_lock);
504
505 spin_lock_irq(&tpg->acl_node_lock);
506 }
507 spin_unlock_irq(&tpg->acl_node_lock);
508 }
509
510 static struct se_port *core_alloc_port(struct se_device *dev)
511 {
512 struct se_port *port, *port_tmp;
513
514 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
515 if (!port) {
516 pr_err("Unable to allocate struct se_port\n");
517 return ERR_PTR(-ENOMEM);
518 }
519 INIT_LIST_HEAD(&port->sep_alua_list);
520 INIT_LIST_HEAD(&port->sep_list);
521 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
522 spin_lock_init(&port->sep_alua_lock);
523 mutex_init(&port->sep_tg_pt_md_mutex);
524
525 spin_lock(&dev->se_port_lock);
526 if (dev->dev_port_count == 0x0000ffff) {
527 pr_warn("Reached dev->dev_port_count =="
528 " 0x0000ffff\n");
529 spin_unlock(&dev->se_port_lock);
530 return ERR_PTR(-ENOSPC);
531 }
532 again:
533 /*
534 * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
535 * Here is the table from spc4r17 section 7.7.3.8.
536 *
537 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
538 *
539 * Code Description
540 * 0h Reserved
541 * 1h Relative port 1, historically known as port A
542 * 2h Relative port 2, historically known as port B
543 * 3h to FFFFh Relative port 3 through 65 535
544 */
545 port->sep_rtpi = dev->dev_rpti_counter++;
546 if (!port->sep_rtpi)
547 goto again;
548
549 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
550 /*
551 * Make sure RELATIVE TARGET PORT IDENTIFER is unique
552 * for 16-bit wrap..
553 */
554 if (port->sep_rtpi == port_tmp->sep_rtpi)
555 goto again;
556 }
557 spin_unlock(&dev->se_port_lock);
558
559 return port;
560 }
561
562 static void core_export_port(
563 struct se_device *dev,
564 struct se_portal_group *tpg,
565 struct se_port *port,
566 struct se_lun *lun)
567 {
568 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
569 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
570
571 spin_lock(&dev->se_port_lock);
572 spin_lock(&lun->lun_sep_lock);
573 port->sep_tpg = tpg;
574 port->sep_lun = lun;
575 lun->lun_sep = port;
576 spin_unlock(&lun->lun_sep_lock);
577
578 list_add_tail(&port->sep_list, &dev->dev_sep_list);
579 spin_unlock(&dev->se_port_lock);
580
581 if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
582 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
583 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
584 pr_err("Unable to allocate t10_alua_tg_pt"
585 "_gp_member_t\n");
586 return;
587 }
588 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
589 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
590 su_dev->t10_alua.default_tg_pt_gp);
591 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
592 pr_debug("%s/%s: Adding to default ALUA Target Port"
593 " Group: alua/default_tg_pt_gp\n",
594 dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
595 }
596
597 dev->dev_port_count++;
598 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
599 }
600
601 /*
602 * Called with struct se_device->se_port_lock spinlock held.
603 */
604 static void core_release_port(struct se_device *dev, struct se_port *port)
605 __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
606 {
607 /*
608 * Wait for any port reference for PR ALL_TG_PT=1 operation
609 * to complete in __core_scsi3_alloc_registration()
610 */
611 spin_unlock(&dev->se_port_lock);
612 if (atomic_read(&port->sep_tg_pt_ref_cnt))
613 cpu_relax();
614 spin_lock(&dev->se_port_lock);
615
616 core_alua_free_tg_pt_gp_mem(port);
617
618 list_del(&port->sep_list);
619 dev->dev_port_count--;
620 kfree(port);
621 }
622
623 int core_dev_export(
624 struct se_device *dev,
625 struct se_portal_group *tpg,
626 struct se_lun *lun)
627 {
628 struct se_port *port;
629
630 port = core_alloc_port(dev);
631 if (IS_ERR(port))
632 return PTR_ERR(port);
633
634 lun->lun_se_dev = dev;
635 se_dev_start(dev);
636
637 atomic_inc(&dev->dev_export_obj.obj_access_count);
638 core_export_port(dev, tpg, port, lun);
639 return 0;
640 }
641
642 void core_dev_unexport(
643 struct se_device *dev,
644 struct se_portal_group *tpg,
645 struct se_lun *lun)
646 {
647 struct se_port *port = lun->lun_sep;
648
649 spin_lock(&lun->lun_sep_lock);
650 if (lun->lun_se_dev == NULL) {
651 spin_unlock(&lun->lun_sep_lock);
652 return;
653 }
654 spin_unlock(&lun->lun_sep_lock);
655
656 spin_lock(&dev->se_port_lock);
657 atomic_dec(&dev->dev_export_obj.obj_access_count);
658 core_release_port(dev, port);
659 spin_unlock(&dev->se_port_lock);
660
661 se_dev_stop(dev);
662 lun->lun_se_dev = NULL;
663 }
664
665 int target_report_luns(struct se_cmd *se_cmd)
666 {
667 struct se_dev_entry *deve;
668 struct se_session *se_sess = se_cmd->se_sess;
669 unsigned char *buf;
670 u32 lun_count = 0, offset = 8, i;
671
672 buf = transport_kmap_data_sg(se_cmd);
673 if (!buf)
674 return -ENOMEM;
675
676 /*
677 * If no struct se_session pointer is present, this struct se_cmd is
678 * coming via a target_core_mod PASSTHROUGH op, and not through
679 * a $FABRIC_MOD. In that case, report LUN=0 only.
680 */
681 if (!se_sess) {
682 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
683 lun_count = 1;
684 goto done;
685 }
686
687 spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
688 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
689 deve = se_sess->se_node_acl->device_list[i];
690 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
691 continue;
692 /*
693 * We determine the correct LUN LIST LENGTH even once we
694 * have reached the initial allocation length.
695 * See SPC2-R20 7.19.
696 */
697 lun_count++;
698 if ((offset + 8) > se_cmd->data_length)
699 continue;
700
701 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
702 offset += 8;
703 }
704 spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
705
706 /*
707 * See SPC3 r07, page 159.
708 */
709 done:
710 lun_count *= 8;
711 buf[0] = ((lun_count >> 24) & 0xff);
712 buf[1] = ((lun_count >> 16) & 0xff);
713 buf[2] = ((lun_count >> 8) & 0xff);
714 buf[3] = (lun_count & 0xff);
715 transport_kunmap_data_sg(se_cmd);
716
717 target_complete_cmd(se_cmd, GOOD);
718 return 0;
719 }
720
721 /* se_release_device_for_hba():
722 *
723 *
724 */
725 void se_release_device_for_hba(struct se_device *dev)
726 {
727 struct se_hba *hba = dev->se_hba;
728
729 if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
730 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
731 (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
732 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
733 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
734 se_dev_stop(dev);
735
736 if (dev->dev_ptr) {
737 destroy_workqueue(dev->tmr_wq);
738 if (dev->transport->free_device)
739 dev->transport->free_device(dev->dev_ptr);
740 }
741
742 spin_lock(&hba->device_lock);
743 list_del(&dev->dev_list);
744 hba->dev_count--;
745 spin_unlock(&hba->device_lock);
746
747 core_scsi3_free_all_registrations(dev);
748 se_release_vpd_for_dev(dev);
749
750 kfree(dev);
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->se_sub_dev->t10_wwn.t10_vpd_lock);
758 list_for_each_entry_safe(vpd, vpd_tmp,
759 &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
760 list_del(&vpd->vpd_list);
761 kfree(vpd);
762 }
763 spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
764 }
765
766 /* se_free_virtual_device():
767 *
768 * Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
769 */
770 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
771 {
772 if (!list_empty(&dev->dev_sep_list))
773 dump_stack();
774
775 core_alua_free_lu_gp_mem(dev);
776 se_release_device_for_hba(dev);
777
778 return 0;
779 }
780
781 static void se_dev_start(struct se_device *dev)
782 {
783 struct se_hba *hba = dev->se_hba;
784
785 spin_lock(&hba->device_lock);
786 atomic_inc(&dev->dev_obj.obj_access_count);
787 if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
788 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
789 dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
790 dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
791 } else if (dev->dev_status &
792 TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
793 dev->dev_status &=
794 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
795 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
796 }
797 }
798 spin_unlock(&hba->device_lock);
799 }
800
801 static void se_dev_stop(struct se_device *dev)
802 {
803 struct se_hba *hba = dev->se_hba;
804
805 spin_lock(&hba->device_lock);
806 atomic_dec(&dev->dev_obj.obj_access_count);
807 if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
808 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
809 dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
810 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
811 } else if (dev->dev_status &
812 TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
813 dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
814 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
815 }
816 }
817 spin_unlock(&hba->device_lock);
818 }
819
820 int se_dev_check_online(struct se_device *dev)
821 {
822 unsigned long flags;
823 int ret;
824
825 spin_lock_irqsave(&dev->dev_status_lock, flags);
826 ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
827 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
828 spin_unlock_irqrestore(&dev->dev_status_lock, flags);
829
830 return ret;
831 }
832
833 int se_dev_check_shutdown(struct se_device *dev)
834 {
835 int ret;
836
837 spin_lock_irq(&dev->dev_status_lock);
838 ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
839 spin_unlock_irq(&dev->dev_status_lock);
840
841 return ret;
842 }
843
844 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
845 {
846 u32 tmp, aligned_max_sectors;
847 /*
848 * Limit max_sectors to a PAGE_SIZE aligned value for modern
849 * transport_allocate_data_tasks() operation.
850 */
851 tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
852 aligned_max_sectors = (tmp / block_size);
853 if (max_sectors != aligned_max_sectors) {
854 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
855 " to %u\n", max_sectors, aligned_max_sectors);
856 return aligned_max_sectors;
857 }
858
859 return max_sectors;
860 }
861
862 void se_dev_set_default_attribs(
863 struct se_device *dev,
864 struct se_dev_limits *dev_limits)
865 {
866 struct queue_limits *limits = &dev_limits->limits;
867
868 dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
869 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
870 dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
871 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
872 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
873 dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
874 dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
875 dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
876 dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
877 dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
878 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
879 dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
880 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
881 /*
882 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
883 * iblock_create_virtdevice() from struct queue_limits values
884 * if blk_queue_discard()==1
885 */
886 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
887 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
888 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
889 dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
890 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
891 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
892 /*
893 * block_size is based on subsystem plugin dependent requirements.
894 */
895 dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
896 dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
897 /*
898 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
899 */
900 limits->max_hw_sectors = se_dev_align_max_sectors(limits->max_hw_sectors,
901 limits->logical_block_size);
902 dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
903
904 /*
905 * Set fabric_max_sectors, which is reported in block limits
906 * VPD page (B0h).
907 */
908 dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
909 /*
910 * Set optimal_sectors from fabric_max_sectors, which can be
911 * lowered via configfs.
912 */
913 dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
914 /*
915 * queue_depth is based on subsystem plugin dependent requirements.
916 */
917 dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
918 dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
919 }
920
921 int se_dev_set_max_unmap_lba_count(
922 struct se_device *dev,
923 u32 max_unmap_lba_count)
924 {
925 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
926 pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
927 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
928 return 0;
929 }
930
931 int se_dev_set_max_unmap_block_desc_count(
932 struct se_device *dev,
933 u32 max_unmap_block_desc_count)
934 {
935 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
936 max_unmap_block_desc_count;
937 pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
938 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
939 return 0;
940 }
941
942 int se_dev_set_unmap_granularity(
943 struct se_device *dev,
944 u32 unmap_granularity)
945 {
946 dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
947 pr_debug("dev[%p]: Set unmap_granularity: %u\n",
948 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
949 return 0;
950 }
951
952 int se_dev_set_unmap_granularity_alignment(
953 struct se_device *dev,
954 u32 unmap_granularity_alignment)
955 {
956 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
957 pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
958 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
959 return 0;
960 }
961
962 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
963 {
964 if (flag != 0 && flag != 1) {
965 pr_err("Illegal value %d\n", flag);
966 return -EINVAL;
967 }
968
969 if (flag) {
970 pr_err("dpo_emulated not supported\n");
971 return -EINVAL;
972 }
973
974 return 0;
975 }
976
977 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
978 {
979 if (flag != 0 && flag != 1) {
980 pr_err("Illegal value %d\n", flag);
981 return -EINVAL;
982 }
983
984 if (flag && dev->transport->fua_write_emulated == 0) {
985 pr_err("fua_write_emulated not supported\n");
986 return -EINVAL;
987 }
988 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
989 pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
990 dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
991 return 0;
992 }
993
994 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
995 {
996 if (flag != 0 && flag != 1) {
997 pr_err("Illegal value %d\n", flag);
998 return -EINVAL;
999 }
1000
1001 if (flag) {
1002 pr_err("ua read emulated not supported\n");
1003 return -EINVAL;
1004 }
1005
1006 return 0;
1007 }
1008
1009 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1010 {
1011 if (flag != 0 && flag != 1) {
1012 pr_err("Illegal value %d\n", flag);
1013 return -EINVAL;
1014 }
1015 if (flag && dev->transport->write_cache_emulated == 0) {
1016 pr_err("write_cache_emulated not supported\n");
1017 return -EINVAL;
1018 }
1019 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1020 pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1021 dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1022 return 0;
1023 }
1024
1025 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1026 {
1027 if ((flag != 0) && (flag != 1) && (flag != 2)) {
1028 pr_err("Illegal value %d\n", flag);
1029 return -EINVAL;
1030 }
1031
1032 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1033 pr_err("dev[%p]: Unable to change SE Device"
1034 " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1035 " exists\n", dev,
1036 atomic_read(&dev->dev_export_obj.obj_access_count));
1037 return -EINVAL;
1038 }
1039 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1040 pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1041 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1042
1043 return 0;
1044 }
1045
1046 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1047 {
1048 if ((flag != 0) && (flag != 1)) {
1049 pr_err("Illegal value %d\n", flag);
1050 return -EINVAL;
1051 }
1052
1053 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1054 pr_err("dev[%p]: Unable to change SE Device TAS while"
1055 " dev_export_obj: %d count exists\n", dev,
1056 atomic_read(&dev->dev_export_obj.obj_access_count));
1057 return -EINVAL;
1058 }
1059 dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1060 pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1061 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1062
1063 return 0;
1064 }
1065
1066 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1067 {
1068 if ((flag != 0) && (flag != 1)) {
1069 pr_err("Illegal value %d\n", flag);
1070 return -EINVAL;
1071 }
1072 /*
1073 * We expect this value to be non-zero when generic Block Layer
1074 * Discard supported is detected iblock_create_virtdevice().
1075 */
1076 if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1077 pr_err("Generic Block Discard not supported\n");
1078 return -ENOSYS;
1079 }
1080
1081 dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1082 pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1083 dev, flag);
1084 return 0;
1085 }
1086
1087 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1088 {
1089 if ((flag != 0) && (flag != 1)) {
1090 pr_err("Illegal value %d\n", flag);
1091 return -EINVAL;
1092 }
1093 /*
1094 * We expect this value to be non-zero when generic Block Layer
1095 * Discard supported is detected iblock_create_virtdevice().
1096 */
1097 if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1098 pr_err("Generic Block Discard not supported\n");
1099 return -ENOSYS;
1100 }
1101
1102 dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1103 pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1104 dev, flag);
1105 return 0;
1106 }
1107
1108 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1109 {
1110 if ((flag != 0) && (flag != 1)) {
1111 pr_err("Illegal value %d\n", flag);
1112 return -EINVAL;
1113 }
1114 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1115 pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1116 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1117 return 0;
1118 }
1119
1120 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1121 {
1122 if ((flag != 0) && (flag != 1)) {
1123 printk(KERN_ERR "Illegal value %d\n", flag);
1124 return -EINVAL;
1125 }
1126 dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1127 pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1128 dev, flag);
1129 return 0;
1130 }
1131
1132 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1133 {
1134 if (flag != 0) {
1135 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1136 " reordering not implemented\n", dev);
1137 return -ENOSYS;
1138 }
1139 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1140 pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1141 return 0;
1142 }
1143
1144 /*
1145 * Note, this can only be called on unexported SE Device Object.
1146 */
1147 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1148 {
1149 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1150 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1151 " dev_export_obj: %d count exists\n", dev,
1152 atomic_read(&dev->dev_export_obj.obj_access_count));
1153 return -EINVAL;
1154 }
1155 if (!queue_depth) {
1156 pr_err("dev[%p]: Illegal ZERO value for queue"
1157 "_depth\n", dev);
1158 return -EINVAL;
1159 }
1160
1161 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1162 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1163 pr_err("dev[%p]: Passed queue_depth: %u"
1164 " exceeds TCM/SE_Device TCQ: %u\n",
1165 dev, queue_depth,
1166 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1167 return -EINVAL;
1168 }
1169 } else {
1170 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1171 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1172 pr_err("dev[%p]: Passed queue_depth:"
1173 " %u exceeds TCM/SE_Device MAX"
1174 " TCQ: %u\n", dev, queue_depth,
1175 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1176 return -EINVAL;
1177 }
1178 }
1179 }
1180
1181 dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1182 pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1183 dev, queue_depth);
1184 return 0;
1185 }
1186
1187 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1188 {
1189 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1190 pr_err("dev[%p]: Unable to change SE Device"
1191 " fabric_max_sectors while dev_export_obj: %d count exists\n",
1192 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1193 return -EINVAL;
1194 }
1195 if (!fabric_max_sectors) {
1196 pr_err("dev[%p]: Illegal ZERO value for"
1197 " fabric_max_sectors\n", dev);
1198 return -EINVAL;
1199 }
1200 if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1201 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1202 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1203 DA_STATUS_MAX_SECTORS_MIN);
1204 return -EINVAL;
1205 }
1206 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1207 if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1208 pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1209 " greater than TCM/SE_Device max_sectors:"
1210 " %u\n", dev, fabric_max_sectors,
1211 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1212 return -EINVAL;
1213 }
1214 } else {
1215 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1216 pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1217 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1218 " %u\n", dev, fabric_max_sectors,
1219 DA_STATUS_MAX_SECTORS_MAX);
1220 return -EINVAL;
1221 }
1222 }
1223 /*
1224 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1225 */
1226 fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1227 dev->se_sub_dev->se_dev_attrib.block_size);
1228
1229 dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1230 pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1231 dev, fabric_max_sectors);
1232 return 0;
1233 }
1234
1235 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1236 {
1237 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1238 pr_err("dev[%p]: Unable to change SE Device"
1239 " optimal_sectors while dev_export_obj: %d count exists\n",
1240 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1241 return -EINVAL;
1242 }
1243 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1244 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1245 " changed for TCM/pSCSI\n", dev);
1246 return -EINVAL;
1247 }
1248 if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1249 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1250 " greater than fabric_max_sectors: %u\n", dev,
1251 optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1252 return -EINVAL;
1253 }
1254
1255 dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1256 pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1257 dev, optimal_sectors);
1258 return 0;
1259 }
1260
1261 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1262 {
1263 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1264 pr_err("dev[%p]: Unable to change SE Device block_size"
1265 " while dev_export_obj: %d count exists\n", dev,
1266 atomic_read(&dev->dev_export_obj.obj_access_count));
1267 return -EINVAL;
1268 }
1269
1270 if ((block_size != 512) &&
1271 (block_size != 1024) &&
1272 (block_size != 2048) &&
1273 (block_size != 4096)) {
1274 pr_err("dev[%p]: Illegal value for block_device: %u"
1275 " for SE device, must be 512, 1024, 2048 or 4096\n",
1276 dev, block_size);
1277 return -EINVAL;
1278 }
1279
1280 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1281 pr_err("dev[%p]: Not allowed to change block_size for"
1282 " Physical Device, use for Linux/SCSI to change"
1283 " block_size for underlying hardware\n", dev);
1284 return -EINVAL;
1285 }
1286
1287 dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1288 pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1289 dev, block_size);
1290 return 0;
1291 }
1292
1293 struct se_lun *core_dev_add_lun(
1294 struct se_portal_group *tpg,
1295 struct se_device *dev,
1296 u32 lun)
1297 {
1298 struct se_lun *lun_p;
1299 int rc;
1300
1301 if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1302 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1303 atomic_read(&dev->dev_access_obj.obj_access_count));
1304 return ERR_PTR(-EACCES);
1305 }
1306
1307 lun_p = core_tpg_pre_addlun(tpg, lun);
1308 if (IS_ERR(lun_p))
1309 return lun_p;
1310
1311 rc = core_tpg_post_addlun(tpg, lun_p,
1312 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1313 if (rc < 0)
1314 return ERR_PTR(rc);
1315
1316 pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1317 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1318 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1319 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1320 /*
1321 * Update LUN maps for dynamically added initiators when
1322 * generate_node_acl is enabled.
1323 */
1324 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1325 struct se_node_acl *acl;
1326 spin_lock_irq(&tpg->acl_node_lock);
1327 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1328 if (acl->dynamic_node_acl &&
1329 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1330 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1331 spin_unlock_irq(&tpg->acl_node_lock);
1332 core_tpg_add_node_to_devs(acl, tpg);
1333 spin_lock_irq(&tpg->acl_node_lock);
1334 }
1335 }
1336 spin_unlock_irq(&tpg->acl_node_lock);
1337 }
1338
1339 return lun_p;
1340 }
1341
1342 /* core_dev_del_lun():
1343 *
1344 *
1345 */
1346 int core_dev_del_lun(
1347 struct se_portal_group *tpg,
1348 u32 unpacked_lun)
1349 {
1350 struct se_lun *lun;
1351
1352 lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1353 if (IS_ERR(lun))
1354 return PTR_ERR(lun);
1355
1356 core_tpg_post_dellun(tpg, lun);
1357
1358 pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1359 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1360 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1361 tpg->se_tpg_tfo->get_fabric_name());
1362
1363 return 0;
1364 }
1365
1366 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1367 {
1368 struct se_lun *lun;
1369
1370 spin_lock(&tpg->tpg_lun_lock);
1371 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1372 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1373 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1374 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1375 TRANSPORT_MAX_LUNS_PER_TPG-1,
1376 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1377 spin_unlock(&tpg->tpg_lun_lock);
1378 return NULL;
1379 }
1380 lun = tpg->tpg_lun_list[unpacked_lun];
1381
1382 if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1383 pr_err("%s Logical Unit Number: %u is not free on"
1384 " Target Portal Group: %hu, ignoring request.\n",
1385 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1386 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1387 spin_unlock(&tpg->tpg_lun_lock);
1388 return NULL;
1389 }
1390 spin_unlock(&tpg->tpg_lun_lock);
1391
1392 return lun;
1393 }
1394
1395 /* core_dev_get_lun():
1396 *
1397 *
1398 */
1399 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1400 {
1401 struct se_lun *lun;
1402
1403 spin_lock(&tpg->tpg_lun_lock);
1404 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1405 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1406 "_TPG-1: %u for Target Portal Group: %hu\n",
1407 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1408 TRANSPORT_MAX_LUNS_PER_TPG-1,
1409 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1410 spin_unlock(&tpg->tpg_lun_lock);
1411 return NULL;
1412 }
1413 lun = tpg->tpg_lun_list[unpacked_lun];
1414
1415 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1416 pr_err("%s Logical Unit Number: %u is not active on"
1417 " Target Portal Group: %hu, ignoring request.\n",
1418 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1419 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1420 spin_unlock(&tpg->tpg_lun_lock);
1421 return NULL;
1422 }
1423 spin_unlock(&tpg->tpg_lun_lock);
1424
1425 return lun;
1426 }
1427
1428 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1429 struct se_portal_group *tpg,
1430 u32 mapped_lun,
1431 char *initiatorname,
1432 int *ret)
1433 {
1434 struct se_lun_acl *lacl;
1435 struct se_node_acl *nacl;
1436
1437 if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1438 pr_err("%s InitiatorName exceeds maximum size.\n",
1439 tpg->se_tpg_tfo->get_fabric_name());
1440 *ret = -EOVERFLOW;
1441 return NULL;
1442 }
1443 nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1444 if (!nacl) {
1445 *ret = -EINVAL;
1446 return NULL;
1447 }
1448 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1449 if (!lacl) {
1450 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1451 *ret = -ENOMEM;
1452 return NULL;
1453 }
1454
1455 INIT_LIST_HEAD(&lacl->lacl_list);
1456 lacl->mapped_lun = mapped_lun;
1457 lacl->se_lun_nacl = nacl;
1458 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1459
1460 return lacl;
1461 }
1462
1463 int core_dev_add_initiator_node_lun_acl(
1464 struct se_portal_group *tpg,
1465 struct se_lun_acl *lacl,
1466 u32 unpacked_lun,
1467 u32 lun_access)
1468 {
1469 struct se_lun *lun;
1470 struct se_node_acl *nacl;
1471
1472 lun = core_dev_get_lun(tpg, unpacked_lun);
1473 if (!lun) {
1474 pr_err("%s Logical Unit Number: %u is not active on"
1475 " Target Portal Group: %hu, ignoring request.\n",
1476 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1477 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1478 return -EINVAL;
1479 }
1480
1481 nacl = lacl->se_lun_nacl;
1482 if (!nacl)
1483 return -EINVAL;
1484
1485 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1486 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1487 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1488
1489 lacl->se_lun = lun;
1490
1491 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1492 lun_access, nacl, tpg) < 0)
1493 return -EINVAL;
1494
1495 spin_lock(&lun->lun_acl_lock);
1496 list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1497 atomic_inc(&lun->lun_acl_count);
1498 smp_mb__after_atomic_inc();
1499 spin_unlock(&lun->lun_acl_lock);
1500
1501 pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1502 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1503 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1504 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1505 lacl->initiatorname);
1506 /*
1507 * Check to see if there are any existing persistent reservation APTPL
1508 * pre-registrations that need to be enabled for this LUN ACL..
1509 */
1510 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1511 return 0;
1512 }
1513
1514 /* core_dev_del_initiator_node_lun_acl():
1515 *
1516 *
1517 */
1518 int core_dev_del_initiator_node_lun_acl(
1519 struct se_portal_group *tpg,
1520 struct se_lun *lun,
1521 struct se_lun_acl *lacl)
1522 {
1523 struct se_node_acl *nacl;
1524
1525 nacl = lacl->se_lun_nacl;
1526 if (!nacl)
1527 return -EINVAL;
1528
1529 spin_lock(&lun->lun_acl_lock);
1530 list_del(&lacl->lacl_list);
1531 atomic_dec(&lun->lun_acl_count);
1532 smp_mb__after_atomic_dec();
1533 spin_unlock(&lun->lun_acl_lock);
1534
1535 core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1536 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1537
1538 lacl->se_lun = NULL;
1539
1540 pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1541 " InitiatorNode: %s Mapped LUN: %u\n",
1542 tpg->se_tpg_tfo->get_fabric_name(),
1543 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1544 lacl->initiatorname, lacl->mapped_lun);
1545
1546 return 0;
1547 }
1548
1549 void core_dev_free_initiator_node_lun_acl(
1550 struct se_portal_group *tpg,
1551 struct se_lun_acl *lacl)
1552 {
1553 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1554 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1555 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1556 tpg->se_tpg_tfo->get_fabric_name(),
1557 lacl->initiatorname, lacl->mapped_lun);
1558
1559 kfree(lacl);
1560 }
1561
1562 int core_dev_setup_virtual_lun0(void)
1563 {
1564 struct se_hba *hba;
1565 struct se_device *dev;
1566 struct se_subsystem_dev *se_dev = NULL;
1567 struct se_subsystem_api *t;
1568 char buf[16];
1569 int ret;
1570
1571 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1572 if (IS_ERR(hba))
1573 return PTR_ERR(hba);
1574
1575 lun0_hba = hba;
1576 t = hba->transport;
1577
1578 se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1579 if (!se_dev) {
1580 pr_err("Unable to allocate memory for"
1581 " struct se_subsystem_dev\n");
1582 ret = -ENOMEM;
1583 goto out;
1584 }
1585 INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1586 spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1587 INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1588 INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1589 spin_lock_init(&se_dev->t10_pr.registration_lock);
1590 spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1591 INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1592 spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1593 spin_lock_init(&se_dev->se_dev_lock);
1594 se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1595 se_dev->t10_wwn.t10_sub_dev = se_dev;
1596 se_dev->t10_alua.t10_sub_dev = se_dev;
1597 se_dev->se_dev_attrib.da_sub_dev = se_dev;
1598 se_dev->se_dev_hba = hba;
1599
1600 se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1601 if (!se_dev->se_dev_su_ptr) {
1602 pr_err("Unable to locate subsystem dependent pointer"
1603 " from allocate_virtdevice()\n");
1604 ret = -ENOMEM;
1605 goto out;
1606 }
1607 lun0_su_dev = se_dev;
1608
1609 memset(buf, 0, 16);
1610 sprintf(buf, "rd_pages=8");
1611 t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1612
1613 dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1614 if (IS_ERR(dev)) {
1615 ret = PTR_ERR(dev);
1616 goto out;
1617 }
1618 se_dev->se_dev_ptr = dev;
1619 g_lun0_dev = dev;
1620
1621 return 0;
1622 out:
1623 lun0_su_dev = NULL;
1624 kfree(se_dev);
1625 if (lun0_hba) {
1626 core_delete_hba(lun0_hba);
1627 lun0_hba = NULL;
1628 }
1629 return ret;
1630 }
1631
1632
1633 void core_dev_release_virtual_lun0(void)
1634 {
1635 struct se_hba *hba = lun0_hba;
1636 struct se_subsystem_dev *su_dev = lun0_su_dev;
1637
1638 if (!hba)
1639 return;
1640
1641 if (g_lun0_dev)
1642 se_free_virtual_device(g_lun0_dev, hba);
1643
1644 kfree(su_dev);
1645 core_delete_hba(hba);
1646 }
Linux kernel - Deliverables
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