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371a9770f563e513d3be0fd18680294db5f72ec3
[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 * (c) Copyright 2003-2013 Datera, Inc.
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
27 #include <linux/net.h>
28 #include <linux/string.h>
29 #include <linux/delay.h>
30 #include <linux/timer.h>
31 #include <linux/slab.h>
32 #include <linux/spinlock.h>
33 #include <linux/kthread.h>
34 #include <linux/in.h>
35 #include <linux/export.h>
36 #include <asm/unaligned.h>
37 #include <net/sock.h>
38 #include <net/tcp.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_device.h>
41
42 #include <target/target_core_base.h>
43 #include <target/target_core_backend.h>
44 #include <target/target_core_fabric.h>
45
46 #include "target_core_internal.h"
47 #include "target_core_alua.h"
48 #include "target_core_pr.h"
49 #include "target_core_ua.h"
50
51 DEFINE_MUTEX(g_device_mutex);
52 LIST_HEAD(g_device_list);
53
54 static struct se_hba *lun0_hba;
55 /* not static, needed by tpg.c */
56 struct se_device *g_lun0_dev;
57
58 sense_reason_t
59 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
60 {
61 struct se_lun *se_lun = NULL;
62 struct se_session *se_sess = se_cmd->se_sess;
63 struct se_device *dev;
64 unsigned long flags;
65
66 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
67 return TCM_NON_EXISTENT_LUN;
68
69 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
70 se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
71 if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
72 struct se_dev_entry *deve = se_cmd->se_deve;
73
74 deve->total_cmds++;
75
76 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
77 (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
78 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
79 " Access for 0x%08x\n",
80 se_cmd->se_tfo->get_fabric_name(),
81 unpacked_lun);
82 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
83 return TCM_WRITE_PROTECTED;
84 }
85
86 if (se_cmd->data_direction == DMA_TO_DEVICE)
87 deve->write_bytes += se_cmd->data_length;
88 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
89 deve->read_bytes += se_cmd->data_length;
90
91 se_lun = deve->se_lun;
92 se_cmd->se_lun = deve->se_lun;
93 se_cmd->pr_res_key = deve->pr_res_key;
94 se_cmd->orig_fe_lun = unpacked_lun;
95 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
96
97 percpu_ref_get(&se_lun->lun_ref);
98 se_cmd->lun_ref_active = true;
99 }
100 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
101
102 if (!se_lun) {
103 /*
104 * Use the se_portal_group->tpg_virt_lun0 to allow for
105 * REPORT_LUNS, et al to be returned when no active
106 * MappedLUN=0 exists for this Initiator Port.
107 */
108 if (unpacked_lun != 0) {
109 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
110 " Access for 0x%08x\n",
111 se_cmd->se_tfo->get_fabric_name(),
112 unpacked_lun);
113 return TCM_NON_EXISTENT_LUN;
114 }
115 /*
116 * Force WRITE PROTECT for virtual LUN 0
117 */
118 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
119 (se_cmd->data_direction != DMA_NONE))
120 return TCM_WRITE_PROTECTED;
121
122 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
123 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
124 se_cmd->orig_fe_lun = 0;
125 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
126
127 percpu_ref_get(&se_lun->lun_ref);
128 se_cmd->lun_ref_active = true;
129 }
130
131 /* Directly associate cmd with se_dev */
132 se_cmd->se_dev = se_lun->lun_se_dev;
133
134 dev = se_lun->lun_se_dev;
135 atomic_long_inc(&dev->num_cmds);
136 if (se_cmd->data_direction == DMA_TO_DEVICE)
137 atomic_long_add(se_cmd->data_length, &dev->write_bytes);
138 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
139 atomic_long_add(se_cmd->data_length, &dev->read_bytes);
140
141 return 0;
142 }
143 EXPORT_SYMBOL(transport_lookup_cmd_lun);
144
145 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
146 {
147 struct se_dev_entry *deve;
148 struct se_lun *se_lun = NULL;
149 struct se_session *se_sess = se_cmd->se_sess;
150 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
151 unsigned long flags;
152
153 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
154 return -ENODEV;
155
156 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
157 se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
158 deve = se_cmd->se_deve;
159
160 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
161 se_tmr->tmr_lun = deve->se_lun;
162 se_cmd->se_lun = deve->se_lun;
163 se_lun = deve->se_lun;
164 se_cmd->pr_res_key = deve->pr_res_key;
165 se_cmd->orig_fe_lun = unpacked_lun;
166 }
167 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
168
169 if (!se_lun) {
170 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
171 " Access for 0x%08x\n",
172 se_cmd->se_tfo->get_fabric_name(),
173 unpacked_lun);
174 return -ENODEV;
175 }
176
177 /* Directly associate cmd with se_dev */
178 se_cmd->se_dev = se_lun->lun_se_dev;
179 se_tmr->tmr_dev = se_lun->lun_se_dev;
180
181 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
182 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
183 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
184
185 return 0;
186 }
187 EXPORT_SYMBOL(transport_lookup_tmr_lun);
188
189 /*
190 * This function is called from core_scsi3_emulate_pro_register_and_move()
191 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
192 * when a matching rtpi is found.
193 */
194 struct se_dev_entry *core_get_se_deve_from_rtpi(
195 struct se_node_acl *nacl,
196 u16 rtpi)
197 {
198 struct se_dev_entry *deve;
199 struct se_lun *lun;
200 struct se_port *port;
201 struct se_portal_group *tpg = nacl->se_tpg;
202 u32 i;
203
204 spin_lock_irq(&nacl->device_list_lock);
205 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
206 deve = nacl->device_list[i];
207
208 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
209 continue;
210
211 lun = deve->se_lun;
212 if (!lun) {
213 pr_err("%s device entries device pointer is"
214 " NULL, but Initiator has access.\n",
215 tpg->se_tpg_tfo->get_fabric_name());
216 continue;
217 }
218 port = lun->lun_sep;
219 if (!port) {
220 pr_err("%s device entries device pointer is"
221 " NULL, but Initiator has access.\n",
222 tpg->se_tpg_tfo->get_fabric_name());
223 continue;
224 }
225 if (port->sep_rtpi != rtpi)
226 continue;
227
228 atomic_inc_mb(&deve->pr_ref_count);
229 spin_unlock_irq(&nacl->device_list_lock);
230
231 return deve;
232 }
233 spin_unlock_irq(&nacl->device_list_lock);
234
235 return NULL;
236 }
237
238 int core_free_device_list_for_node(
239 struct se_node_acl *nacl,
240 struct se_portal_group *tpg)
241 {
242 struct se_dev_entry *deve;
243 struct se_lun *lun;
244 u32 i;
245
246 if (!nacl->device_list)
247 return 0;
248
249 spin_lock_irq(&nacl->device_list_lock);
250 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
251 deve = nacl->device_list[i];
252
253 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
254 continue;
255
256 if (!deve->se_lun) {
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 lun = deve->se_lun;
263
264 spin_unlock_irq(&nacl->device_list_lock);
265 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
266 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
267 spin_lock_irq(&nacl->device_list_lock);
268 }
269 spin_unlock_irq(&nacl->device_list_lock);
270
271 array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
272 nacl->device_list = NULL;
273
274 return 0;
275 }
276
277 void core_update_device_list_access(
278 u32 mapped_lun,
279 u32 lun_access,
280 struct se_node_acl *nacl)
281 {
282 struct se_dev_entry *deve;
283
284 spin_lock_irq(&nacl->device_list_lock);
285 deve = nacl->device_list[mapped_lun];
286 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
287 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
288 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
289 } else {
290 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
291 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
292 }
293 spin_unlock_irq(&nacl->device_list_lock);
294 }
295
296 /* core_enable_device_list_for_node():
297 *
298 *
299 */
300 int core_enable_device_list_for_node(
301 struct se_lun *lun,
302 struct se_lun_acl *lun_acl,
303 u32 mapped_lun,
304 u32 lun_access,
305 struct se_node_acl *nacl,
306 struct se_portal_group *tpg)
307 {
308 struct se_port *port = lun->lun_sep;
309 struct se_dev_entry *deve;
310
311 spin_lock_irq(&nacl->device_list_lock);
312
313 deve = nacl->device_list[mapped_lun];
314
315 /*
316 * Check if the call is handling demo mode -> explicit LUN ACL
317 * transition. This transition must be for the same struct se_lun
318 * + mapped_lun that was setup in demo mode..
319 */
320 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
321 if (deve->se_lun_acl != NULL) {
322 pr_err("struct se_dev_entry->se_lun_acl"
323 " already set for demo mode -> explicit"
324 " LUN ACL transition\n");
325 spin_unlock_irq(&nacl->device_list_lock);
326 return -EINVAL;
327 }
328 if (deve->se_lun != lun) {
329 pr_err("struct se_dev_entry->se_lun does"
330 " match passed struct se_lun for demo mode"
331 " -> explicit LUN ACL transition\n");
332 spin_unlock_irq(&nacl->device_list_lock);
333 return -EINVAL;
334 }
335 deve->se_lun_acl = lun_acl;
336
337 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
338 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
339 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
340 } else {
341 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
342 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
343 }
344
345 spin_unlock_irq(&nacl->device_list_lock);
346 return 0;
347 }
348
349 deve->se_lun = lun;
350 deve->se_lun_acl = lun_acl;
351 deve->mapped_lun = mapped_lun;
352 deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
353
354 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
355 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
356 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
357 } else {
358 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
359 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
360 }
361
362 deve->creation_time = get_jiffies_64();
363 deve->attach_count++;
364 spin_unlock_irq(&nacl->device_list_lock);
365
366 spin_lock_bh(&port->sep_alua_lock);
367 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
368 spin_unlock_bh(&port->sep_alua_lock);
369
370 return 0;
371 }
372
373 /* core_disable_device_list_for_node():
374 *
375 *
376 */
377 int core_disable_device_list_for_node(
378 struct se_lun *lun,
379 struct se_lun_acl *lun_acl,
380 u32 mapped_lun,
381 u32 lun_access,
382 struct se_node_acl *nacl,
383 struct se_portal_group *tpg)
384 {
385 struct se_port *port = lun->lun_sep;
386 struct se_dev_entry *deve = nacl->device_list[mapped_lun];
387
388 /*
389 * If the MappedLUN entry is being disabled, the entry in
390 * port->sep_alua_list must be removed now before clearing the
391 * struct se_dev_entry pointers below as logic in
392 * core_alua_do_transition_tg_pt() depends on these being present.
393 *
394 * deve->se_lun_acl will be NULL for demo-mode created LUNs
395 * that have not been explicitly converted to MappedLUNs ->
396 * struct se_lun_acl, but we remove deve->alua_port_list from
397 * port->sep_alua_list. This also means that active UAs and
398 * NodeACL context specific PR metadata for demo-mode
399 * MappedLUN *deve will be released below..
400 */
401 spin_lock_bh(&port->sep_alua_lock);
402 list_del(&deve->alua_port_list);
403 spin_unlock_bh(&port->sep_alua_lock);
404 /*
405 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
406 * PR operation to complete.
407 */
408 while (atomic_read(&deve->pr_ref_count) != 0)
409 cpu_relax();
410
411 spin_lock_irq(&nacl->device_list_lock);
412 /*
413 * Disable struct se_dev_entry LUN ACL mapping
414 */
415 core_scsi3_ua_release_all(deve);
416 deve->se_lun = NULL;
417 deve->se_lun_acl = NULL;
418 deve->lun_flags = 0;
419 deve->creation_time = 0;
420 deve->attach_count--;
421 spin_unlock_irq(&nacl->device_list_lock);
422
423 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
424 return 0;
425 }
426
427 /* core_clear_lun_from_tpg():
428 *
429 *
430 */
431 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
432 {
433 struct se_node_acl *nacl;
434 struct se_dev_entry *deve;
435 u32 i;
436
437 spin_lock_irq(&tpg->acl_node_lock);
438 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
439 spin_unlock_irq(&tpg->acl_node_lock);
440
441 spin_lock_irq(&nacl->device_list_lock);
442 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
443 deve = nacl->device_list[i];
444 if (lun != deve->se_lun)
445 continue;
446 spin_unlock_irq(&nacl->device_list_lock);
447
448 core_disable_device_list_for_node(lun, NULL,
449 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
450 nacl, tpg);
451
452 spin_lock_irq(&nacl->device_list_lock);
453 }
454 spin_unlock_irq(&nacl->device_list_lock);
455
456 spin_lock_irq(&tpg->acl_node_lock);
457 }
458 spin_unlock_irq(&tpg->acl_node_lock);
459 }
460
461 static struct se_port *core_alloc_port(struct se_device *dev)
462 {
463 struct se_port *port, *port_tmp;
464
465 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
466 if (!port) {
467 pr_err("Unable to allocate struct se_port\n");
468 return ERR_PTR(-ENOMEM);
469 }
470 INIT_LIST_HEAD(&port->sep_alua_list);
471 INIT_LIST_HEAD(&port->sep_list);
472 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
473 spin_lock_init(&port->sep_alua_lock);
474 mutex_init(&port->sep_tg_pt_md_mutex);
475
476 spin_lock(&dev->se_port_lock);
477 if (dev->dev_port_count == 0x0000ffff) {
478 pr_warn("Reached dev->dev_port_count =="
479 " 0x0000ffff\n");
480 spin_unlock(&dev->se_port_lock);
481 return ERR_PTR(-ENOSPC);
482 }
483 again:
484 /*
485 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
486 * Here is the table from spc4r17 section 7.7.3.8.
487 *
488 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
489 *
490 * Code Description
491 * 0h Reserved
492 * 1h Relative port 1, historically known as port A
493 * 2h Relative port 2, historically known as port B
494 * 3h to FFFFh Relative port 3 through 65 535
495 */
496 port->sep_rtpi = dev->dev_rpti_counter++;
497 if (!port->sep_rtpi)
498 goto again;
499
500 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
501 /*
502 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
503 * for 16-bit wrap..
504 */
505 if (port->sep_rtpi == port_tmp->sep_rtpi)
506 goto again;
507 }
508 spin_unlock(&dev->se_port_lock);
509
510 return port;
511 }
512
513 static void core_export_port(
514 struct se_device *dev,
515 struct se_portal_group *tpg,
516 struct se_port *port,
517 struct se_lun *lun)
518 {
519 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
520
521 spin_lock(&dev->se_port_lock);
522 spin_lock(&lun->lun_sep_lock);
523 port->sep_tpg = tpg;
524 port->sep_lun = lun;
525 lun->lun_sep = port;
526 spin_unlock(&lun->lun_sep_lock);
527
528 list_add_tail(&port->sep_list, &dev->dev_sep_list);
529 spin_unlock(&dev->se_port_lock);
530
531 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
532 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
533 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
534 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
535 pr_err("Unable to allocate t10_alua_tg_pt"
536 "_gp_member_t\n");
537 return;
538 }
539 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
540 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
541 dev->t10_alua.default_tg_pt_gp);
542 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
543 pr_debug("%s/%s: Adding to default ALUA Target Port"
544 " Group: alua/default_tg_pt_gp\n",
545 dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
546 }
547
548 dev->dev_port_count++;
549 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
550 }
551
552 /*
553 * Called with struct se_device->se_port_lock spinlock held.
554 */
555 static void core_release_port(struct se_device *dev, struct se_port *port)
556 __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
557 {
558 /*
559 * Wait for any port reference for PR ALL_TG_PT=1 operation
560 * to complete in __core_scsi3_alloc_registration()
561 */
562 spin_unlock(&dev->se_port_lock);
563 if (atomic_read(&port->sep_tg_pt_ref_cnt))
564 cpu_relax();
565 spin_lock(&dev->se_port_lock);
566
567 core_alua_free_tg_pt_gp_mem(port);
568
569 list_del(&port->sep_list);
570 dev->dev_port_count--;
571 kfree(port);
572 }
573
574 int core_dev_export(
575 struct se_device *dev,
576 struct se_portal_group *tpg,
577 struct se_lun *lun)
578 {
579 struct se_hba *hba = dev->se_hba;
580 struct se_port *port;
581
582 port = core_alloc_port(dev);
583 if (IS_ERR(port))
584 return PTR_ERR(port);
585
586 lun->lun_se_dev = dev;
587
588 spin_lock(&hba->device_lock);
589 dev->export_count++;
590 spin_unlock(&hba->device_lock);
591
592 core_export_port(dev, tpg, port, lun);
593 return 0;
594 }
595
596 void core_dev_unexport(
597 struct se_device *dev,
598 struct se_portal_group *tpg,
599 struct se_lun *lun)
600 {
601 struct se_hba *hba = dev->se_hba;
602 struct se_port *port = lun->lun_sep;
603
604 spin_lock(&lun->lun_sep_lock);
605 if (lun->lun_se_dev == NULL) {
606 spin_unlock(&lun->lun_sep_lock);
607 return;
608 }
609 spin_unlock(&lun->lun_sep_lock);
610
611 spin_lock(&dev->se_port_lock);
612 core_release_port(dev, port);
613 spin_unlock(&dev->se_port_lock);
614
615 spin_lock(&hba->device_lock);
616 dev->export_count--;
617 spin_unlock(&hba->device_lock);
618
619 lun->lun_sep = NULL;
620 lun->lun_se_dev = NULL;
621 }
622
623 static void se_release_vpd_for_dev(struct se_device *dev)
624 {
625 struct t10_vpd *vpd, *vpd_tmp;
626
627 spin_lock(&dev->t10_wwn.t10_vpd_lock);
628 list_for_each_entry_safe(vpd, vpd_tmp,
629 &dev->t10_wwn.t10_vpd_list, vpd_list) {
630 list_del(&vpd->vpd_list);
631 kfree(vpd);
632 }
633 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
634 }
635
636 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
637 {
638 u32 aligned_max_sectors;
639 u32 alignment;
640 /*
641 * Limit max_sectors to a PAGE_SIZE aligned value for modern
642 * transport_allocate_data_tasks() operation.
643 */
644 alignment = max(1ul, PAGE_SIZE / block_size);
645 aligned_max_sectors = rounddown(max_sectors, alignment);
646
647 if (max_sectors != aligned_max_sectors)
648 pr_info("Rounding down aligned max_sectors from %u to %u\n",
649 max_sectors, aligned_max_sectors);
650
651 return aligned_max_sectors;
652 }
653
654 bool se_dev_check_wce(struct se_device *dev)
655 {
656 bool wce = false;
657
658 if (dev->transport->get_write_cache)
659 wce = dev->transport->get_write_cache(dev);
660 else if (dev->dev_attrib.emulate_write_cache > 0)
661 wce = true;
662
663 return wce;
664 }
665
666 int se_dev_set_max_unmap_lba_count(
667 struct se_device *dev,
668 u32 max_unmap_lba_count)
669 {
670 dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
671 pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
672 dev, dev->dev_attrib.max_unmap_lba_count);
673 return 0;
674 }
675 EXPORT_SYMBOL(se_dev_set_max_unmap_lba_count);
676
677 int se_dev_set_max_unmap_block_desc_count(
678 struct se_device *dev,
679 u32 max_unmap_block_desc_count)
680 {
681 dev->dev_attrib.max_unmap_block_desc_count =
682 max_unmap_block_desc_count;
683 pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
684 dev, dev->dev_attrib.max_unmap_block_desc_count);
685 return 0;
686 }
687 EXPORT_SYMBOL(se_dev_set_max_unmap_block_desc_count);
688
689 int se_dev_set_unmap_granularity(
690 struct se_device *dev,
691 u32 unmap_granularity)
692 {
693 dev->dev_attrib.unmap_granularity = unmap_granularity;
694 pr_debug("dev[%p]: Set unmap_granularity: %u\n",
695 dev, dev->dev_attrib.unmap_granularity);
696 return 0;
697 }
698 EXPORT_SYMBOL(se_dev_set_unmap_granularity);
699
700 int se_dev_set_unmap_granularity_alignment(
701 struct se_device *dev,
702 u32 unmap_granularity_alignment)
703 {
704 dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
705 pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
706 dev, dev->dev_attrib.unmap_granularity_alignment);
707 return 0;
708 }
709 EXPORT_SYMBOL(se_dev_set_unmap_granularity_alignment);
710
711 int se_dev_set_max_write_same_len(
712 struct se_device *dev,
713 u32 max_write_same_len)
714 {
715 dev->dev_attrib.max_write_same_len = max_write_same_len;
716 pr_debug("dev[%p]: Set max_write_same_len: %u\n",
717 dev, dev->dev_attrib.max_write_same_len);
718 return 0;
719 }
720 EXPORT_SYMBOL(se_dev_set_max_write_same_len);
721
722 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
723 {
724 const char *configname;
725
726 configname = config_item_name(&dev->dev_group.cg_item);
727 if (strlen(configname) >= 16) {
728 pr_warn("dev[%p]: Backstore name '%s' is too long for "
729 "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
730 configname);
731 }
732 snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
733 }
734
735 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
736 {
737 if (dev->export_count) {
738 pr_err("dev[%p]: Unable to change model alias"
739 " while export_count is %d\n",
740 dev, dev->export_count);
741 return -EINVAL;
742 }
743
744 if (flag != 0 && flag != 1) {
745 pr_err("Illegal value %d\n", flag);
746 return -EINVAL;
747 }
748
749 if (flag) {
750 dev_set_t10_wwn_model_alias(dev);
751 } else {
752 strncpy(&dev->t10_wwn.model[0],
753 dev->transport->inquiry_prod, 16);
754 }
755 dev->dev_attrib.emulate_model_alias = flag;
756
757 return 0;
758 }
759 EXPORT_SYMBOL(se_dev_set_emulate_model_alias);
760
761 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
762 {
763 printk_once(KERN_WARNING
764 "ignoring deprecated emulate_dpo attribute\n");
765 return 0;
766 }
767 EXPORT_SYMBOL(se_dev_set_emulate_dpo);
768
769 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
770 {
771 if (flag != 0 && flag != 1) {
772 pr_err("Illegal value %d\n", flag);
773 return -EINVAL;
774 }
775 if (flag &&
776 dev->transport->get_write_cache) {
777 pr_warn("emulate_fua_write not supported for this device, ignoring\n");
778 return 0;
779 }
780 if (dev->export_count) {
781 pr_err("emulate_fua_write cannot be changed with active"
782 " exports: %d\n", dev->export_count);
783 return -EINVAL;
784 }
785 dev->dev_attrib.emulate_fua_write = flag;
786 pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
787 dev, dev->dev_attrib.emulate_fua_write);
788 return 0;
789 }
790 EXPORT_SYMBOL(se_dev_set_emulate_fua_write);
791
792 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
793 {
794 printk_once(KERN_WARNING
795 "ignoring deprecated emulate_fua_read attribute\n");
796 return 0;
797 }
798 EXPORT_SYMBOL(se_dev_set_emulate_fua_read);
799
800 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
801 {
802 if (flag != 0 && flag != 1) {
803 pr_err("Illegal value %d\n", flag);
804 return -EINVAL;
805 }
806 if (flag &&
807 dev->transport->get_write_cache) {
808 pr_err("emulate_write_cache not supported for this device\n");
809 return -EINVAL;
810 }
811 if (dev->export_count) {
812 pr_err("emulate_write_cache cannot be changed with active"
813 " exports: %d\n", dev->export_count);
814 return -EINVAL;
815 }
816 dev->dev_attrib.emulate_write_cache = flag;
817 pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
818 dev, dev->dev_attrib.emulate_write_cache);
819 return 0;
820 }
821 EXPORT_SYMBOL(se_dev_set_emulate_write_cache);
822
823 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
824 {
825 if ((flag != 0) && (flag != 1) && (flag != 2)) {
826 pr_err("Illegal value %d\n", flag);
827 return -EINVAL;
828 }
829
830 if (dev->export_count) {
831 pr_err("dev[%p]: Unable to change SE Device"
832 " UA_INTRLCK_CTRL while export_count is %d\n",
833 dev, dev->export_count);
834 return -EINVAL;
835 }
836 dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
837 pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
838 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
839
840 return 0;
841 }
842 EXPORT_SYMBOL(se_dev_set_emulate_ua_intlck_ctrl);
843
844 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
845 {
846 if ((flag != 0) && (flag != 1)) {
847 pr_err("Illegal value %d\n", flag);
848 return -EINVAL;
849 }
850
851 if (dev->export_count) {
852 pr_err("dev[%p]: Unable to change SE Device TAS while"
853 " export_count is %d\n",
854 dev, dev->export_count);
855 return -EINVAL;
856 }
857 dev->dev_attrib.emulate_tas = flag;
858 pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
859 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
860
861 return 0;
862 }
863 EXPORT_SYMBOL(se_dev_set_emulate_tas);
864
865 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
866 {
867 if ((flag != 0) && (flag != 1)) {
868 pr_err("Illegal value %d\n", flag);
869 return -EINVAL;
870 }
871 /*
872 * We expect this value to be non-zero when generic Block Layer
873 * Discard supported is detected iblock_create_virtdevice().
874 */
875 if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
876 pr_err("Generic Block Discard not supported\n");
877 return -ENOSYS;
878 }
879
880 dev->dev_attrib.emulate_tpu = flag;
881 pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
882 dev, flag);
883 return 0;
884 }
885 EXPORT_SYMBOL(se_dev_set_emulate_tpu);
886
887 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
888 {
889 if ((flag != 0) && (flag != 1)) {
890 pr_err("Illegal value %d\n", flag);
891 return -EINVAL;
892 }
893 /*
894 * We expect this value to be non-zero when generic Block Layer
895 * Discard supported is detected iblock_create_virtdevice().
896 */
897 if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
898 pr_err("Generic Block Discard not supported\n");
899 return -ENOSYS;
900 }
901
902 dev->dev_attrib.emulate_tpws = flag;
903 pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
904 dev, flag);
905 return 0;
906 }
907 EXPORT_SYMBOL(se_dev_set_emulate_tpws);
908
909 int se_dev_set_emulate_caw(struct se_device *dev, int flag)
910 {
911 if (flag != 0 && flag != 1) {
912 pr_err("Illegal value %d\n", flag);
913 return -EINVAL;
914 }
915 dev->dev_attrib.emulate_caw = flag;
916 pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
917 dev, flag);
918
919 return 0;
920 }
921 EXPORT_SYMBOL(se_dev_set_emulate_caw);
922
923 int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
924 {
925 if (flag != 0 && flag != 1) {
926 pr_err("Illegal value %d\n", flag);
927 return -EINVAL;
928 }
929 dev->dev_attrib.emulate_3pc = flag;
930 pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
931 dev, flag);
932
933 return 0;
934 }
935 EXPORT_SYMBOL(se_dev_set_emulate_3pc);
936
937 int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
938 {
939 int rc, old_prot = dev->dev_attrib.pi_prot_type;
940
941 if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
942 pr_err("Illegal value %d for pi_prot_type\n", flag);
943 return -EINVAL;
944 }
945 if (flag == 2) {
946 pr_err("DIF TYPE2 protection currently not supported\n");
947 return -ENOSYS;
948 }
949 if (dev->dev_attrib.hw_pi_prot_type) {
950 pr_warn("DIF protection enabled on underlying hardware,"
951 " ignoring\n");
952 return 0;
953 }
954 if (!dev->transport->init_prot || !dev->transport->free_prot) {
955 /* 0 is only allowed value for non-supporting backends */
956 if (flag == 0)
957 return 0;
958
959 pr_err("DIF protection not supported by backend: %s\n",
960 dev->transport->name);
961 return -ENOSYS;
962 }
963 if (!(dev->dev_flags & DF_CONFIGURED)) {
964 pr_err("DIF protection requires device to be configured\n");
965 return -ENODEV;
966 }
967 if (dev->export_count) {
968 pr_err("dev[%p]: Unable to change SE Device PROT type while"
969 " export_count is %d\n", dev, dev->export_count);
970 return -EINVAL;
971 }
972
973 dev->dev_attrib.pi_prot_type = flag;
974
975 if (flag && !old_prot) {
976 rc = dev->transport->init_prot(dev);
977 if (rc) {
978 dev->dev_attrib.pi_prot_type = old_prot;
979 return rc;
980 }
981
982 } else if (!flag && old_prot) {
983 dev->transport->free_prot(dev);
984 }
985 pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
986
987 return 0;
988 }
989 EXPORT_SYMBOL(se_dev_set_pi_prot_type);
990
991 int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
992 {
993 int rc;
994
995 if (!flag)
996 return 0;
997
998 if (flag != 1) {
999 pr_err("Illegal value %d for pi_prot_format\n", flag);
1000 return -EINVAL;
1001 }
1002 if (!dev->transport->format_prot) {
1003 pr_err("DIF protection format not supported by backend %s\n",
1004 dev->transport->name);
1005 return -ENOSYS;
1006 }
1007 if (!(dev->dev_flags & DF_CONFIGURED)) {
1008 pr_err("DIF protection format requires device to be configured\n");
1009 return -ENODEV;
1010 }
1011 if (dev->export_count) {
1012 pr_err("dev[%p]: Unable to format SE Device PROT type while"
1013 " export_count is %d\n", dev, dev->export_count);
1014 return -EINVAL;
1015 }
1016
1017 rc = dev->transport->format_prot(dev);
1018 if (rc)
1019 return rc;
1020
1021 pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
1022
1023 return 0;
1024 }
1025 EXPORT_SYMBOL(se_dev_set_pi_prot_format);
1026
1027 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1028 {
1029 if ((flag != 0) && (flag != 1)) {
1030 pr_err("Illegal value %d\n", flag);
1031 return -EINVAL;
1032 }
1033 dev->dev_attrib.enforce_pr_isids = flag;
1034 pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1035 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1036 return 0;
1037 }
1038 EXPORT_SYMBOL(se_dev_set_enforce_pr_isids);
1039
1040 int se_dev_set_force_pr_aptpl(struct se_device *dev, int flag)
1041 {
1042 if ((flag != 0) && (flag != 1)) {
1043 printk(KERN_ERR "Illegal value %d\n", flag);
1044 return -EINVAL;
1045 }
1046 if (dev->export_count) {
1047 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
1048 " export_count is %d\n", dev, dev->export_count);
1049 return -EINVAL;
1050 }
1051
1052 dev->dev_attrib.force_pr_aptpl = flag;
1053 pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", dev, flag);
1054 return 0;
1055 }
1056 EXPORT_SYMBOL(se_dev_set_force_pr_aptpl);
1057
1058 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1059 {
1060 if ((flag != 0) && (flag != 1)) {
1061 printk(KERN_ERR "Illegal value %d\n", flag);
1062 return -EINVAL;
1063 }
1064 dev->dev_attrib.is_nonrot = flag;
1065 pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1066 dev, flag);
1067 return 0;
1068 }
1069 EXPORT_SYMBOL(se_dev_set_is_nonrot);
1070
1071 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1072 {
1073 if (flag != 0) {
1074 printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
1075 " reordering not implemented\n", dev);
1076 return -ENOSYS;
1077 }
1078 dev->dev_attrib.emulate_rest_reord = flag;
1079 pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1080 return 0;
1081 }
1082 EXPORT_SYMBOL(se_dev_set_emulate_rest_reord);
1083
1084 /*
1085 * Note, this can only be called on unexported SE Device Object.
1086 */
1087 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1088 {
1089 if (dev->export_count) {
1090 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1091 " export_count is %d\n",
1092 dev, dev->export_count);
1093 return -EINVAL;
1094 }
1095 if (!queue_depth) {
1096 pr_err("dev[%p]: Illegal ZERO value for queue"
1097 "_depth\n", dev);
1098 return -EINVAL;
1099 }
1100
1101 if (queue_depth > dev->dev_attrib.queue_depth) {
1102 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1103 pr_err("dev[%p]: Passed queue_depth:"
1104 " %u exceeds TCM/SE_Device MAX"
1105 " TCQ: %u\n", dev, queue_depth,
1106 dev->dev_attrib.hw_queue_depth);
1107 return -EINVAL;
1108 }
1109 }
1110 dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1111 pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1112 dev, queue_depth);
1113 return 0;
1114 }
1115 EXPORT_SYMBOL(se_dev_set_queue_depth);
1116
1117 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1118 {
1119 if (dev->export_count) {
1120 pr_err("dev[%p]: Unable to change SE Device"
1121 " optimal_sectors while export_count is %d\n",
1122 dev, dev->export_count);
1123 return -EINVAL;
1124 }
1125 if (optimal_sectors > dev->dev_attrib.hw_max_sectors) {
1126 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1127 " greater than hw_max_sectors: %u\n", dev,
1128 optimal_sectors, dev->dev_attrib.hw_max_sectors);
1129 return -EINVAL;
1130 }
1131
1132 dev->dev_attrib.optimal_sectors = optimal_sectors;
1133 pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1134 dev, optimal_sectors);
1135 return 0;
1136 }
1137 EXPORT_SYMBOL(se_dev_set_optimal_sectors);
1138
1139 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1140 {
1141 if (dev->export_count) {
1142 pr_err("dev[%p]: Unable to change SE Device block_size"
1143 " while export_count is %d\n",
1144 dev, dev->export_count);
1145 return -EINVAL;
1146 }
1147
1148 if ((block_size != 512) &&
1149 (block_size != 1024) &&
1150 (block_size != 2048) &&
1151 (block_size != 4096)) {
1152 pr_err("dev[%p]: Illegal value for block_device: %u"
1153 " for SE device, must be 512, 1024, 2048 or 4096\n",
1154 dev, block_size);
1155 return -EINVAL;
1156 }
1157
1158 dev->dev_attrib.block_size = block_size;
1159 pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1160 dev, block_size);
1161
1162 if (dev->dev_attrib.max_bytes_per_io)
1163 dev->dev_attrib.hw_max_sectors =
1164 dev->dev_attrib.max_bytes_per_io / block_size;
1165
1166 return 0;
1167 }
1168 EXPORT_SYMBOL(se_dev_set_block_size);
1169
1170 struct se_lun *core_dev_add_lun(
1171 struct se_portal_group *tpg,
1172 struct se_device *dev,
1173 u32 unpacked_lun)
1174 {
1175 struct se_lun *lun;
1176 int rc;
1177
1178 lun = core_tpg_alloc_lun(tpg, unpacked_lun);
1179 if (IS_ERR(lun))
1180 return lun;
1181
1182 rc = core_tpg_add_lun(tpg, lun,
1183 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1184 if (rc < 0)
1185 return ERR_PTR(rc);
1186
1187 pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1188 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1189 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1190 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1191 /*
1192 * Update LUN maps for dynamically added initiators when
1193 * generate_node_acl is enabled.
1194 */
1195 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1196 struct se_node_acl *acl;
1197 spin_lock_irq(&tpg->acl_node_lock);
1198 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1199 if (acl->dynamic_node_acl &&
1200 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1201 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1202 spin_unlock_irq(&tpg->acl_node_lock);
1203 core_tpg_add_node_to_devs(acl, tpg);
1204 spin_lock_irq(&tpg->acl_node_lock);
1205 }
1206 }
1207 spin_unlock_irq(&tpg->acl_node_lock);
1208 }
1209
1210 return lun;
1211 }
1212
1213 /* core_dev_del_lun():
1214 *
1215 *
1216 */
1217 void core_dev_del_lun(
1218 struct se_portal_group *tpg,
1219 struct se_lun *lun)
1220 {
1221 pr_debug("%s_TPG[%u]_LUN[%u] - Deactivating %s Logical Unit from"
1222 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1223 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1224 tpg->se_tpg_tfo->get_fabric_name());
1225
1226 core_tpg_remove_lun(tpg, lun);
1227 }
1228
1229 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1230 {
1231 struct se_lun *lun;
1232
1233 spin_lock(&tpg->tpg_lun_lock);
1234 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1235 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1236 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1237 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1238 TRANSPORT_MAX_LUNS_PER_TPG-1,
1239 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1240 spin_unlock(&tpg->tpg_lun_lock);
1241 return NULL;
1242 }
1243 lun = tpg->tpg_lun_list[unpacked_lun];
1244
1245 if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1246 pr_err("%s Logical Unit Number: %u is not free on"
1247 " Target Portal Group: %hu, ignoring request.\n",
1248 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1249 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1250 spin_unlock(&tpg->tpg_lun_lock);
1251 return NULL;
1252 }
1253 spin_unlock(&tpg->tpg_lun_lock);
1254
1255 return lun;
1256 }
1257
1258 /* core_dev_get_lun():
1259 *
1260 *
1261 */
1262 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1263 {
1264 struct se_lun *lun;
1265
1266 spin_lock(&tpg->tpg_lun_lock);
1267 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1268 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1269 "_TPG-1: %u for Target Portal Group: %hu\n",
1270 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1271 TRANSPORT_MAX_LUNS_PER_TPG-1,
1272 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1273 spin_unlock(&tpg->tpg_lun_lock);
1274 return NULL;
1275 }
1276 lun = tpg->tpg_lun_list[unpacked_lun];
1277
1278 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1279 pr_err("%s Logical Unit Number: %u is not active on"
1280 " Target Portal Group: %hu, ignoring request.\n",
1281 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1282 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1283 spin_unlock(&tpg->tpg_lun_lock);
1284 return NULL;
1285 }
1286 spin_unlock(&tpg->tpg_lun_lock);
1287
1288 return lun;
1289 }
1290
1291 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1292 struct se_portal_group *tpg,
1293 struct se_node_acl *nacl,
1294 u32 mapped_lun,
1295 int *ret)
1296 {
1297 struct se_lun_acl *lacl;
1298
1299 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1300 pr_err("%s InitiatorName exceeds maximum size.\n",
1301 tpg->se_tpg_tfo->get_fabric_name());
1302 *ret = -EOVERFLOW;
1303 return NULL;
1304 }
1305 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1306 if (!lacl) {
1307 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1308 *ret = -ENOMEM;
1309 return NULL;
1310 }
1311
1312 INIT_LIST_HEAD(&lacl->lacl_list);
1313 lacl->mapped_lun = mapped_lun;
1314 lacl->se_lun_nacl = nacl;
1315 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1316 nacl->initiatorname);
1317
1318 return lacl;
1319 }
1320
1321 int core_dev_add_initiator_node_lun_acl(
1322 struct se_portal_group *tpg,
1323 struct se_lun_acl *lacl,
1324 u32 unpacked_lun,
1325 u32 lun_access)
1326 {
1327 struct se_lun *lun;
1328 struct se_node_acl *nacl;
1329
1330 lun = core_dev_get_lun(tpg, unpacked_lun);
1331 if (!lun) {
1332 pr_err("%s Logical Unit Number: %u is not active on"
1333 " Target Portal Group: %hu, ignoring request.\n",
1334 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1335 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1336 return -EINVAL;
1337 }
1338
1339 nacl = lacl->se_lun_nacl;
1340 if (!nacl)
1341 return -EINVAL;
1342
1343 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1344 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1345 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1346
1347 lacl->se_lun = lun;
1348
1349 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1350 lun_access, nacl, tpg) < 0)
1351 return -EINVAL;
1352
1353 spin_lock(&lun->lun_acl_lock);
1354 list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1355 atomic_inc_mb(&lun->lun_acl_count);
1356 spin_unlock(&lun->lun_acl_lock);
1357
1358 pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1359 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1360 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1361 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1362 lacl->initiatorname);
1363 /*
1364 * Check to see if there are any existing persistent reservation APTPL
1365 * pre-registrations that need to be enabled for this LUN ACL..
1366 */
1367 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, nacl,
1368 lacl->mapped_lun);
1369 return 0;
1370 }
1371
1372 /* core_dev_del_initiator_node_lun_acl():
1373 *
1374 *
1375 */
1376 int core_dev_del_initiator_node_lun_acl(
1377 struct se_portal_group *tpg,
1378 struct se_lun *lun,
1379 struct se_lun_acl *lacl)
1380 {
1381 struct se_node_acl *nacl;
1382
1383 nacl = lacl->se_lun_nacl;
1384 if (!nacl)
1385 return -EINVAL;
1386
1387 spin_lock(&lun->lun_acl_lock);
1388 list_del(&lacl->lacl_list);
1389 atomic_dec_mb(&lun->lun_acl_count);
1390 spin_unlock(&lun->lun_acl_lock);
1391
1392 core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1393 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1394
1395 lacl->se_lun = NULL;
1396
1397 pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1398 " InitiatorNode: %s Mapped LUN: %u\n",
1399 tpg->se_tpg_tfo->get_fabric_name(),
1400 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1401 lacl->initiatorname, lacl->mapped_lun);
1402
1403 return 0;
1404 }
1405
1406 void core_dev_free_initiator_node_lun_acl(
1407 struct se_portal_group *tpg,
1408 struct se_lun_acl *lacl)
1409 {
1410 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1411 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1412 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1413 tpg->se_tpg_tfo->get_fabric_name(),
1414 lacl->initiatorname, lacl->mapped_lun);
1415
1416 kfree(lacl);
1417 }
1418
1419 static void scsi_dump_inquiry(struct se_device *dev)
1420 {
1421 struct t10_wwn *wwn = &dev->t10_wwn;
1422 char buf[17];
1423 int i, device_type;
1424 /*
1425 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1426 */
1427 for (i = 0; i < 8; i++)
1428 if (wwn->vendor[i] >= 0x20)
1429 buf[i] = wwn->vendor[i];
1430 else
1431 buf[i] = ' ';
1432 buf[i] = '\0';
1433 pr_debug(" Vendor: %s\n", buf);
1434
1435 for (i = 0; i < 16; i++)
1436 if (wwn->model[i] >= 0x20)
1437 buf[i] = wwn->model[i];
1438 else
1439 buf[i] = ' ';
1440 buf[i] = '\0';
1441 pr_debug(" Model: %s\n", buf);
1442
1443 for (i = 0; i < 4; i++)
1444 if (wwn->revision[i] >= 0x20)
1445 buf[i] = wwn->revision[i];
1446 else
1447 buf[i] = ' ';
1448 buf[i] = '\0';
1449 pr_debug(" Revision: %s\n", buf);
1450
1451 device_type = dev->transport->get_device_type(dev);
1452 pr_debug(" Type: %s ", scsi_device_type(device_type));
1453 }
1454
1455 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1456 {
1457 struct se_device *dev;
1458 struct se_lun *xcopy_lun;
1459
1460 dev = hba->transport->alloc_device(hba, name);
1461 if (!dev)
1462 return NULL;
1463
1464 dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1465 dev->se_hba = hba;
1466 dev->transport = hba->transport;
1467 dev->prot_length = sizeof(struct se_dif_v1_tuple);
1468
1469 INIT_LIST_HEAD(&dev->dev_list);
1470 INIT_LIST_HEAD(&dev->dev_sep_list);
1471 INIT_LIST_HEAD(&dev->dev_tmr_list);
1472 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1473 INIT_LIST_HEAD(&dev->state_list);
1474 INIT_LIST_HEAD(&dev->qf_cmd_list);
1475 INIT_LIST_HEAD(&dev->g_dev_node);
1476 spin_lock_init(&dev->execute_task_lock);
1477 spin_lock_init(&dev->delayed_cmd_lock);
1478 spin_lock_init(&dev->dev_reservation_lock);
1479 spin_lock_init(&dev->se_port_lock);
1480 spin_lock_init(&dev->se_tmr_lock);
1481 spin_lock_init(&dev->qf_cmd_lock);
1482 sema_init(&dev->caw_sem, 1);
1483 atomic_set(&dev->dev_ordered_id, 0);
1484 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1485 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1486 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1487 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1488 spin_lock_init(&dev->t10_pr.registration_lock);
1489 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1490 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1491 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1492 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
1493 spin_lock_init(&dev->t10_alua.lba_map_lock);
1494
1495 dev->t10_wwn.t10_dev = dev;
1496 dev->t10_alua.t10_dev = dev;
1497
1498 dev->dev_attrib.da_dev = dev;
1499 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1500 dev->dev_attrib.emulate_dpo = 1;
1501 dev->dev_attrib.emulate_fua_write = 1;
1502 dev->dev_attrib.emulate_fua_read = 1;
1503 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1504 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1505 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1506 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1507 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1508 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
1509 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
1510 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
1511 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1512 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
1513 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1514 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1515 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1516 dev->dev_attrib.max_unmap_block_desc_count =
1517 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1518 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1519 dev->dev_attrib.unmap_granularity_alignment =
1520 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1521 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1522
1523 xcopy_lun = &dev->xcopy_lun;
1524 xcopy_lun->lun_se_dev = dev;
1525 init_completion(&xcopy_lun->lun_shutdown_comp);
1526 INIT_LIST_HEAD(&xcopy_lun->lun_acl_list);
1527 spin_lock_init(&xcopy_lun->lun_acl_lock);
1528 spin_lock_init(&xcopy_lun->lun_sep_lock);
1529 init_completion(&xcopy_lun->lun_ref_comp);
1530
1531 return dev;
1532 }
1533
1534 int target_configure_device(struct se_device *dev)
1535 {
1536 struct se_hba *hba = dev->se_hba;
1537 int ret;
1538
1539 if (dev->dev_flags & DF_CONFIGURED) {
1540 pr_err("se_dev->se_dev_ptr already set for storage"
1541 " object\n");
1542 return -EEXIST;
1543 }
1544
1545 ret = dev->transport->configure_device(dev);
1546 if (ret)
1547 goto out;
1548 /*
1549 * XXX: there is not much point to have two different values here..
1550 */
1551 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1552 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1553
1554 /*
1555 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1556 */
1557 dev->dev_attrib.hw_max_sectors =
1558 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1559 dev->dev_attrib.hw_block_size);
1560 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
1561
1562 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1563 dev->creation_time = get_jiffies_64();
1564
1565 ret = core_setup_alua(dev);
1566 if (ret)
1567 goto out;
1568
1569 /*
1570 * Startup the struct se_device processing thread
1571 */
1572 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1573 dev->transport->name);
1574 if (!dev->tmr_wq) {
1575 pr_err("Unable to create tmr workqueue for %s\n",
1576 dev->transport->name);
1577 ret = -ENOMEM;
1578 goto out_free_alua;
1579 }
1580
1581 /*
1582 * Setup work_queue for QUEUE_FULL
1583 */
1584 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1585
1586 /*
1587 * Preload the initial INQUIRY const values if we are doing
1588 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1589 * passthrough because this is being provided by the backend LLD.
1590 */
1591 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
1592 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1593 strncpy(&dev->t10_wwn.model[0],
1594 dev->transport->inquiry_prod, 16);
1595 strncpy(&dev->t10_wwn.revision[0],
1596 dev->transport->inquiry_rev, 4);
1597 }
1598
1599 scsi_dump_inquiry(dev);
1600
1601 spin_lock(&hba->device_lock);
1602 hba->dev_count++;
1603 spin_unlock(&hba->device_lock);
1604
1605 mutex_lock(&g_device_mutex);
1606 list_add_tail(&dev->g_dev_node, &g_device_list);
1607 mutex_unlock(&g_device_mutex);
1608
1609 dev->dev_flags |= DF_CONFIGURED;
1610
1611 return 0;
1612
1613 out_free_alua:
1614 core_alua_free_lu_gp_mem(dev);
1615 out:
1616 se_release_vpd_for_dev(dev);
1617 return ret;
1618 }
1619
1620 void target_free_device(struct se_device *dev)
1621 {
1622 struct se_hba *hba = dev->se_hba;
1623
1624 WARN_ON(!list_empty(&dev->dev_sep_list));
1625
1626 if (dev->dev_flags & DF_CONFIGURED) {
1627 destroy_workqueue(dev->tmr_wq);
1628
1629 mutex_lock(&g_device_mutex);
1630 list_del(&dev->g_dev_node);
1631 mutex_unlock(&g_device_mutex);
1632
1633 spin_lock(&hba->device_lock);
1634 hba->dev_count--;
1635 spin_unlock(&hba->device_lock);
1636 }
1637
1638 core_alua_free_lu_gp_mem(dev);
1639 core_alua_set_lba_map(dev, NULL, 0, 0);
1640 core_scsi3_free_all_registrations(dev);
1641 se_release_vpd_for_dev(dev);
1642
1643 if (dev->transport->free_prot)
1644 dev->transport->free_prot(dev);
1645
1646 dev->transport->free_device(dev);
1647 }
1648
1649 int core_dev_setup_virtual_lun0(void)
1650 {
1651 struct se_hba *hba;
1652 struct se_device *dev;
1653 char buf[] = "rd_pages=8,rd_nullio=1";
1654 int ret;
1655
1656 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1657 if (IS_ERR(hba))
1658 return PTR_ERR(hba);
1659
1660 dev = target_alloc_device(hba, "virt_lun0");
1661 if (!dev) {
1662 ret = -ENOMEM;
1663 goto out_free_hba;
1664 }
1665
1666 hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1667
1668 ret = target_configure_device(dev);
1669 if (ret)
1670 goto out_free_se_dev;
1671
1672 lun0_hba = hba;
1673 g_lun0_dev = dev;
1674 return 0;
1675
1676 out_free_se_dev:
1677 target_free_device(dev);
1678 out_free_hba:
1679 core_delete_hba(hba);
1680 return ret;
1681 }
1682
1683
1684 void core_dev_release_virtual_lun0(void)
1685 {
1686 struct se_hba *hba = lun0_hba;
1687
1688 if (!hba)
1689 return;
1690
1691 if (g_lun0_dev)
1692 target_free_device(g_lun0_dev);
1693 core_delete_hba(hba);
1694 }
1695
1696 /*
1697 * Common CDB parsing for kernel and user passthrough.
1698 */
1699 sense_reason_t
1700 passthrough_parse_cdb(struct se_cmd *cmd,
1701 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1702 {
1703 unsigned char *cdb = cmd->t_task_cdb;
1704
1705 /*
1706 * Clear a lun set in the cdb if the initiator talking to use spoke
1707 * and old standards version, as we can't assume the underlying device
1708 * won't choke up on it.
1709 */
1710 switch (cdb[0]) {
1711 case READ_10: /* SBC - RDProtect */
1712 case READ_12: /* SBC - RDProtect */
1713 case READ_16: /* SBC - RDProtect */
1714 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1715 case VERIFY: /* SBC - VRProtect */
1716 case VERIFY_16: /* SBC - VRProtect */
1717 case WRITE_VERIFY: /* SBC - VRProtect */
1718 case WRITE_VERIFY_12: /* SBC - VRProtect */
1719 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1720 break;
1721 default:
1722 cdb[1] &= 0x1f; /* clear logical unit number */
1723 break;
1724 }
1725
1726 /*
1727 * For REPORT LUNS we always need to emulate the response, for everything
1728 * else, pass it up.
1729 */
1730 if (cdb[0] == REPORT_LUNS) {
1731 cmd->execute_cmd = spc_emulate_report_luns;
1732 return TCM_NO_SENSE;
1733 }
1734
1735 /* Set DATA_CDB flag for ops that should have it */
1736 switch (cdb[0]) {
1737 case READ_6:
1738 case READ_10:
1739 case READ_12:
1740 case READ_16:
1741 case WRITE_6:
1742 case WRITE_10:
1743 case WRITE_12:
1744 case WRITE_16:
1745 case WRITE_VERIFY:
1746 case WRITE_VERIFY_12:
1747 case 0x8e: /* WRITE_VERIFY_16 */
1748 case COMPARE_AND_WRITE:
1749 case XDWRITEREAD_10:
1750 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1751 break;
1752 case VARIABLE_LENGTH_CMD:
1753 switch (get_unaligned_be16(&cdb[8])) {
1754 case READ_32:
1755 case WRITE_32:
1756 case 0x0c: /* WRITE_VERIFY_32 */
1757 case XDWRITEREAD_32:
1758 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1759 break;
1760 }
1761 }
1762
1763 cmd->execute_cmd = exec_cmd;
1764
1765 return TCM_NO_SENSE;
1766 }
1767 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux kernel - Deliverables
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