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Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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 IDENTIFIER 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 IDENTIFIER 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 IDENTIFIER */
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 if (se_cmd->data_length < 16) {
673 pr_warn("REPORT LUNS allocation length %u too small\n",
674 se_cmd->data_length);
675 se_cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
676 return -EINVAL;
677 }
678
679 buf = transport_kmap_data_sg(se_cmd);
680 if (!buf)
681 return -ENOMEM;
682
683 /*
684 * If no struct se_session pointer is present, this struct se_cmd is
685 * coming via a target_core_mod PASSTHROUGH op, and not through
686 * a $FABRIC_MOD. In that case, report LUN=0 only.
687 */
688 if (!se_sess) {
689 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
690 lun_count = 1;
691 goto done;
692 }
693
694 spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
695 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
696 deve = se_sess->se_node_acl->device_list[i];
697 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
698 continue;
699 /*
700 * We determine the correct LUN LIST LENGTH even once we
701 * have reached the initial allocation length.
702 * See SPC2-R20 7.19.
703 */
704 lun_count++;
705 if ((offset + 8) > se_cmd->data_length)
706 continue;
707
708 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
709 offset += 8;
710 }
711 spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
712
713 /*
714 * See SPC3 r07, page 159.
715 */
716 done:
717 lun_count *= 8;
718 buf[0] = ((lun_count >> 24) & 0xff);
719 buf[1] = ((lun_count >> 16) & 0xff);
720 buf[2] = ((lun_count >> 8) & 0xff);
721 buf[3] = (lun_count & 0xff);
722 transport_kunmap_data_sg(se_cmd);
723
724 target_complete_cmd(se_cmd, GOOD);
725 return 0;
726 }
727
728 /* se_release_device_for_hba():
729 *
730 *
731 */
732 void se_release_device_for_hba(struct se_device *dev)
733 {
734 struct se_hba *hba = dev->se_hba;
735
736 if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
737 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
738 (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
739 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
740 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
741 se_dev_stop(dev);
742
743 if (dev->dev_ptr) {
744 destroy_workqueue(dev->tmr_wq);
745 if (dev->transport->free_device)
746 dev->transport->free_device(dev->dev_ptr);
747 }
748
749 spin_lock(&hba->device_lock);
750 list_del(&dev->dev_list);
751 hba->dev_count--;
752 spin_unlock(&hba->device_lock);
753
754 core_scsi3_free_all_registrations(dev);
755 se_release_vpd_for_dev(dev);
756
757 kfree(dev);
758 }
759
760 void se_release_vpd_for_dev(struct se_device *dev)
761 {
762 struct t10_vpd *vpd, *vpd_tmp;
763
764 spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
765 list_for_each_entry_safe(vpd, vpd_tmp,
766 &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
767 list_del(&vpd->vpd_list);
768 kfree(vpd);
769 }
770 spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
771 }
772
773 /* se_free_virtual_device():
774 *
775 * Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
776 */
777 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
778 {
779 if (!list_empty(&dev->dev_sep_list))
780 dump_stack();
781
782 core_alua_free_lu_gp_mem(dev);
783 se_release_device_for_hba(dev);
784
785 return 0;
786 }
787
788 static void se_dev_start(struct se_device *dev)
789 {
790 struct se_hba *hba = dev->se_hba;
791
792 spin_lock(&hba->device_lock);
793 atomic_inc(&dev->dev_obj.obj_access_count);
794 if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
795 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
796 dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
797 dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
798 } else if (dev->dev_status &
799 TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
800 dev->dev_status &=
801 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
802 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
803 }
804 }
805 spin_unlock(&hba->device_lock);
806 }
807
808 static void se_dev_stop(struct se_device *dev)
809 {
810 struct se_hba *hba = dev->se_hba;
811
812 spin_lock(&hba->device_lock);
813 atomic_dec(&dev->dev_obj.obj_access_count);
814 if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
815 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
816 dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
817 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
818 } else if (dev->dev_status &
819 TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
820 dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
821 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
822 }
823 }
824 spin_unlock(&hba->device_lock);
825 }
826
827 int se_dev_check_online(struct se_device *dev)
828 {
829 unsigned long flags;
830 int ret;
831
832 spin_lock_irqsave(&dev->dev_status_lock, flags);
833 ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
834 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
835 spin_unlock_irqrestore(&dev->dev_status_lock, flags);
836
837 return ret;
838 }
839
840 int se_dev_check_shutdown(struct se_device *dev)
841 {
842 int ret;
843
844 spin_lock_irq(&dev->dev_status_lock);
845 ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
846 spin_unlock_irq(&dev->dev_status_lock);
847
848 return ret;
849 }
850
851 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
852 {
853 u32 aligned_max_sectors;
854 u32 alignment;
855 /*
856 * Limit max_sectors to a PAGE_SIZE aligned value for modern
857 * transport_allocate_data_tasks() operation.
858 */
859 alignment = max(1ul, PAGE_SIZE / block_size);
860 aligned_max_sectors = rounddown(max_sectors, alignment);
861
862 if (max_sectors != aligned_max_sectors)
863 pr_info("Rounding down aligned max_sectors from %u to %u\n",
864 max_sectors, aligned_max_sectors);
865
866 return aligned_max_sectors;
867 }
868
869 void se_dev_set_default_attribs(
870 struct se_device *dev,
871 struct se_dev_limits *dev_limits)
872 {
873 struct queue_limits *limits = &dev_limits->limits;
874
875 dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
876 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
877 dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
878 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
879 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
880 dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
881 dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
882 dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
883 dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
884 dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
885 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
886 dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
887 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
888 /*
889 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
890 * iblock_create_virtdevice() from struct queue_limits values
891 * if blk_queue_discard()==1
892 */
893 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
894 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
895 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
896 dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
897 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
898 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
899 /*
900 * block_size is based on subsystem plugin dependent requirements.
901 */
902 dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
903 dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
904 /*
905 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
906 */
907 limits->max_hw_sectors = se_dev_align_max_sectors(limits->max_hw_sectors,
908 limits->logical_block_size);
909 dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
910
911 /*
912 * Set fabric_max_sectors, which is reported in block limits
913 * VPD page (B0h).
914 */
915 dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
916 /*
917 * Set optimal_sectors from fabric_max_sectors, which can be
918 * lowered via configfs.
919 */
920 dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
921 /*
922 * queue_depth is based on subsystem plugin dependent requirements.
923 */
924 dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
925 dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
926 }
927
928 int se_dev_set_max_unmap_lba_count(
929 struct se_device *dev,
930 u32 max_unmap_lba_count)
931 {
932 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
933 pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
934 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
935 return 0;
936 }
937
938 int se_dev_set_max_unmap_block_desc_count(
939 struct se_device *dev,
940 u32 max_unmap_block_desc_count)
941 {
942 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
943 max_unmap_block_desc_count;
944 pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
945 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
946 return 0;
947 }
948
949 int se_dev_set_unmap_granularity(
950 struct se_device *dev,
951 u32 unmap_granularity)
952 {
953 dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
954 pr_debug("dev[%p]: Set unmap_granularity: %u\n",
955 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
956 return 0;
957 }
958
959 int se_dev_set_unmap_granularity_alignment(
960 struct se_device *dev,
961 u32 unmap_granularity_alignment)
962 {
963 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
964 pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
965 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
966 return 0;
967 }
968
969 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
970 {
971 if (flag != 0 && flag != 1) {
972 pr_err("Illegal value %d\n", flag);
973 return -EINVAL;
974 }
975
976 if (flag) {
977 pr_err("dpo_emulated not supported\n");
978 return -EINVAL;
979 }
980
981 return 0;
982 }
983
984 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
985 {
986 if (flag != 0 && flag != 1) {
987 pr_err("Illegal value %d\n", flag);
988 return -EINVAL;
989 }
990
991 if (flag &&
992 dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
993 pr_err("emulate_fua_write not supported for pSCSI\n");
994 return -EINVAL;
995 }
996 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
997 pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
998 dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
999 return 0;
1000 }
1001
1002 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
1003 {
1004 if (flag != 0 && flag != 1) {
1005 pr_err("Illegal value %d\n", flag);
1006 return -EINVAL;
1007 }
1008
1009 if (flag) {
1010 pr_err("ua read emulated not supported\n");
1011 return -EINVAL;
1012 }
1013
1014 return 0;
1015 }
1016
1017 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1018 {
1019 if (flag != 0 && flag != 1) {
1020 pr_err("Illegal value %d\n", flag);
1021 return -EINVAL;
1022 }
1023 if (flag &&
1024 dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1025 pr_err("emulate_write_cache not supported for pSCSI\n");
1026 return -EINVAL;
1027 }
1028 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1029 pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1030 dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1031 return 0;
1032 }
1033
1034 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1035 {
1036 if ((flag != 0) && (flag != 1) && (flag != 2)) {
1037 pr_err("Illegal value %d\n", flag);
1038 return -EINVAL;
1039 }
1040
1041 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1042 pr_err("dev[%p]: Unable to change SE Device"
1043 " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1044 " exists\n", dev,
1045 atomic_read(&dev->dev_export_obj.obj_access_count));
1046 return -EINVAL;
1047 }
1048 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1049 pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1050 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1051
1052 return 0;
1053 }
1054
1055 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1056 {
1057 if ((flag != 0) && (flag != 1)) {
1058 pr_err("Illegal value %d\n", flag);
1059 return -EINVAL;
1060 }
1061
1062 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1063 pr_err("dev[%p]: Unable to change SE Device TAS while"
1064 " dev_export_obj: %d count exists\n", dev,
1065 atomic_read(&dev->dev_export_obj.obj_access_count));
1066 return -EINVAL;
1067 }
1068 dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1069 pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1070 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1071
1072 return 0;
1073 }
1074
1075 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1076 {
1077 if ((flag != 0) && (flag != 1)) {
1078 pr_err("Illegal value %d\n", flag);
1079 return -EINVAL;
1080 }
1081 /*
1082 * We expect this value to be non-zero when generic Block Layer
1083 * Discard supported is detected iblock_create_virtdevice().
1084 */
1085 if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1086 pr_err("Generic Block Discard not supported\n");
1087 return -ENOSYS;
1088 }
1089
1090 dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1091 pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1092 dev, flag);
1093 return 0;
1094 }
1095
1096 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1097 {
1098 if ((flag != 0) && (flag != 1)) {
1099 pr_err("Illegal value %d\n", flag);
1100 return -EINVAL;
1101 }
1102 /*
1103 * We expect this value to be non-zero when generic Block Layer
1104 * Discard supported is detected iblock_create_virtdevice().
1105 */
1106 if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1107 pr_err("Generic Block Discard not supported\n");
1108 return -ENOSYS;
1109 }
1110
1111 dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1112 pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1113 dev, flag);
1114 return 0;
1115 }
1116
1117 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1118 {
1119 if ((flag != 0) && (flag != 1)) {
1120 pr_err("Illegal value %d\n", flag);
1121 return -EINVAL;
1122 }
1123 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1124 pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1125 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1126 return 0;
1127 }
1128
1129 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1130 {
1131 if ((flag != 0) && (flag != 1)) {
1132 printk(KERN_ERR "Illegal value %d\n", flag);
1133 return -EINVAL;
1134 }
1135 dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1136 pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1137 dev, flag);
1138 return 0;
1139 }
1140
1141 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1142 {
1143 if (flag != 0) {
1144 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1145 " reordering not implemented\n", dev);
1146 return -ENOSYS;
1147 }
1148 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1149 pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1150 return 0;
1151 }
1152
1153 /*
1154 * Note, this can only be called on unexported SE Device Object.
1155 */
1156 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1157 {
1158 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1159 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1160 " dev_export_obj: %d count exists\n", dev,
1161 atomic_read(&dev->dev_export_obj.obj_access_count));
1162 return -EINVAL;
1163 }
1164 if (!queue_depth) {
1165 pr_err("dev[%p]: Illegal ZERO value for queue"
1166 "_depth\n", dev);
1167 return -EINVAL;
1168 }
1169
1170 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1171 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1172 pr_err("dev[%p]: Passed queue_depth: %u"
1173 " exceeds TCM/SE_Device TCQ: %u\n",
1174 dev, queue_depth,
1175 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1176 return -EINVAL;
1177 }
1178 } else {
1179 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1180 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1181 pr_err("dev[%p]: Passed queue_depth:"
1182 " %u exceeds TCM/SE_Device MAX"
1183 " TCQ: %u\n", dev, queue_depth,
1184 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1185 return -EINVAL;
1186 }
1187 }
1188 }
1189
1190 dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1191 pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1192 dev, queue_depth);
1193 return 0;
1194 }
1195
1196 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1197 {
1198 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1199 pr_err("dev[%p]: Unable to change SE Device"
1200 " fabric_max_sectors while dev_export_obj: %d count exists\n",
1201 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1202 return -EINVAL;
1203 }
1204 if (!fabric_max_sectors) {
1205 pr_err("dev[%p]: Illegal ZERO value for"
1206 " fabric_max_sectors\n", dev);
1207 return -EINVAL;
1208 }
1209 if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1210 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1211 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1212 DA_STATUS_MAX_SECTORS_MIN);
1213 return -EINVAL;
1214 }
1215 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1216 if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1217 pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1218 " greater than TCM/SE_Device max_sectors:"
1219 " %u\n", dev, fabric_max_sectors,
1220 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1221 return -EINVAL;
1222 }
1223 } else {
1224 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1225 pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1226 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1227 " %u\n", dev, fabric_max_sectors,
1228 DA_STATUS_MAX_SECTORS_MAX);
1229 return -EINVAL;
1230 }
1231 }
1232 /*
1233 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1234 */
1235 fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1236 dev->se_sub_dev->se_dev_attrib.block_size);
1237
1238 dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1239 pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1240 dev, fabric_max_sectors);
1241 return 0;
1242 }
1243
1244 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1245 {
1246 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1247 pr_err("dev[%p]: Unable to change SE Device"
1248 " optimal_sectors while dev_export_obj: %d count exists\n",
1249 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1250 return -EINVAL;
1251 }
1252 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1253 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1254 " changed for TCM/pSCSI\n", dev);
1255 return -EINVAL;
1256 }
1257 if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1258 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1259 " greater than fabric_max_sectors: %u\n", dev,
1260 optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1261 return -EINVAL;
1262 }
1263
1264 dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1265 pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1266 dev, optimal_sectors);
1267 return 0;
1268 }
1269
1270 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1271 {
1272 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1273 pr_err("dev[%p]: Unable to change SE Device block_size"
1274 " while dev_export_obj: %d count exists\n", dev,
1275 atomic_read(&dev->dev_export_obj.obj_access_count));
1276 return -EINVAL;
1277 }
1278
1279 if ((block_size != 512) &&
1280 (block_size != 1024) &&
1281 (block_size != 2048) &&
1282 (block_size != 4096)) {
1283 pr_err("dev[%p]: Illegal value for block_device: %u"
1284 " for SE device, must be 512, 1024, 2048 or 4096\n",
1285 dev, block_size);
1286 return -EINVAL;
1287 }
1288
1289 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1290 pr_err("dev[%p]: Not allowed to change block_size for"
1291 " Physical Device, use for Linux/SCSI to change"
1292 " block_size for underlying hardware\n", dev);
1293 return -EINVAL;
1294 }
1295
1296 dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1297 pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1298 dev, block_size);
1299 return 0;
1300 }
1301
1302 struct se_lun *core_dev_add_lun(
1303 struct se_portal_group *tpg,
1304 struct se_device *dev,
1305 u32 lun)
1306 {
1307 struct se_lun *lun_p;
1308 int rc;
1309
1310 if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1311 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1312 atomic_read(&dev->dev_access_obj.obj_access_count));
1313 return ERR_PTR(-EACCES);
1314 }
1315
1316 lun_p = core_tpg_pre_addlun(tpg, lun);
1317 if (IS_ERR(lun_p))
1318 return lun_p;
1319
1320 rc = core_tpg_post_addlun(tpg, lun_p,
1321 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1322 if (rc < 0)
1323 return ERR_PTR(rc);
1324
1325 pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1326 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1327 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1328 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1329 /*
1330 * Update LUN maps for dynamically added initiators when
1331 * generate_node_acl is enabled.
1332 */
1333 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1334 struct se_node_acl *acl;
1335 spin_lock_irq(&tpg->acl_node_lock);
1336 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1337 if (acl->dynamic_node_acl &&
1338 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1339 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1340 spin_unlock_irq(&tpg->acl_node_lock);
1341 core_tpg_add_node_to_devs(acl, tpg);
1342 spin_lock_irq(&tpg->acl_node_lock);
1343 }
1344 }
1345 spin_unlock_irq(&tpg->acl_node_lock);
1346 }
1347
1348 return lun_p;
1349 }
1350
1351 /* core_dev_del_lun():
1352 *
1353 *
1354 */
1355 int core_dev_del_lun(
1356 struct se_portal_group *tpg,
1357 u32 unpacked_lun)
1358 {
1359 struct se_lun *lun;
1360
1361 lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1362 if (IS_ERR(lun))
1363 return PTR_ERR(lun);
1364
1365 core_tpg_post_dellun(tpg, lun);
1366
1367 pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1368 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1369 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1370 tpg->se_tpg_tfo->get_fabric_name());
1371
1372 return 0;
1373 }
1374
1375 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1376 {
1377 struct se_lun *lun;
1378
1379 spin_lock(&tpg->tpg_lun_lock);
1380 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1381 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1382 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1383 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1384 TRANSPORT_MAX_LUNS_PER_TPG-1,
1385 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1386 spin_unlock(&tpg->tpg_lun_lock);
1387 return NULL;
1388 }
1389 lun = tpg->tpg_lun_list[unpacked_lun];
1390
1391 if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1392 pr_err("%s Logical Unit Number: %u is not free on"
1393 " Target Portal Group: %hu, ignoring request.\n",
1394 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1395 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1396 spin_unlock(&tpg->tpg_lun_lock);
1397 return NULL;
1398 }
1399 spin_unlock(&tpg->tpg_lun_lock);
1400
1401 return lun;
1402 }
1403
1404 /* core_dev_get_lun():
1405 *
1406 *
1407 */
1408 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1409 {
1410 struct se_lun *lun;
1411
1412 spin_lock(&tpg->tpg_lun_lock);
1413 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1414 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1415 "_TPG-1: %u for Target Portal Group: %hu\n",
1416 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1417 TRANSPORT_MAX_LUNS_PER_TPG-1,
1418 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1419 spin_unlock(&tpg->tpg_lun_lock);
1420 return NULL;
1421 }
1422 lun = tpg->tpg_lun_list[unpacked_lun];
1423
1424 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1425 pr_err("%s Logical Unit Number: %u is not active on"
1426 " Target Portal Group: %hu, ignoring request.\n",
1427 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1428 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1429 spin_unlock(&tpg->tpg_lun_lock);
1430 return NULL;
1431 }
1432 spin_unlock(&tpg->tpg_lun_lock);
1433
1434 return lun;
1435 }
1436
1437 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1438 struct se_portal_group *tpg,
1439 u32 mapped_lun,
1440 char *initiatorname,
1441 int *ret)
1442 {
1443 struct se_lun_acl *lacl;
1444 struct se_node_acl *nacl;
1445
1446 if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1447 pr_err("%s InitiatorName exceeds maximum size.\n",
1448 tpg->se_tpg_tfo->get_fabric_name());
1449 *ret = -EOVERFLOW;
1450 return NULL;
1451 }
1452 nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1453 if (!nacl) {
1454 *ret = -EINVAL;
1455 return NULL;
1456 }
1457 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1458 if (!lacl) {
1459 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1460 *ret = -ENOMEM;
1461 return NULL;
1462 }
1463
1464 INIT_LIST_HEAD(&lacl->lacl_list);
1465 lacl->mapped_lun = mapped_lun;
1466 lacl->se_lun_nacl = nacl;
1467 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1468
1469 return lacl;
1470 }
1471
1472 int core_dev_add_initiator_node_lun_acl(
1473 struct se_portal_group *tpg,
1474 struct se_lun_acl *lacl,
1475 u32 unpacked_lun,
1476 u32 lun_access)
1477 {
1478 struct se_lun *lun;
1479 struct se_node_acl *nacl;
1480
1481 lun = core_dev_get_lun(tpg, unpacked_lun);
1482 if (!lun) {
1483 pr_err("%s Logical Unit Number: %u is not active on"
1484 " Target Portal Group: %hu, ignoring request.\n",
1485 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1486 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1487 return -EINVAL;
1488 }
1489
1490 nacl = lacl->se_lun_nacl;
1491 if (!nacl)
1492 return -EINVAL;
1493
1494 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1495 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1496 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1497
1498 lacl->se_lun = lun;
1499
1500 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1501 lun_access, nacl, tpg) < 0)
1502 return -EINVAL;
1503
1504 spin_lock(&lun->lun_acl_lock);
1505 list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1506 atomic_inc(&lun->lun_acl_count);
1507 smp_mb__after_atomic_inc();
1508 spin_unlock(&lun->lun_acl_lock);
1509
1510 pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1511 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1512 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1513 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1514 lacl->initiatorname);
1515 /*
1516 * Check to see if there are any existing persistent reservation APTPL
1517 * pre-registrations that need to be enabled for this LUN ACL..
1518 */
1519 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1520 return 0;
1521 }
1522
1523 /* core_dev_del_initiator_node_lun_acl():
1524 *
1525 *
1526 */
1527 int core_dev_del_initiator_node_lun_acl(
1528 struct se_portal_group *tpg,
1529 struct se_lun *lun,
1530 struct se_lun_acl *lacl)
1531 {
1532 struct se_node_acl *nacl;
1533
1534 nacl = lacl->se_lun_nacl;
1535 if (!nacl)
1536 return -EINVAL;
1537
1538 spin_lock(&lun->lun_acl_lock);
1539 list_del(&lacl->lacl_list);
1540 atomic_dec(&lun->lun_acl_count);
1541 smp_mb__after_atomic_dec();
1542 spin_unlock(&lun->lun_acl_lock);
1543
1544 core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1545 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1546
1547 lacl->se_lun = NULL;
1548
1549 pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1550 " InitiatorNode: %s Mapped LUN: %u\n",
1551 tpg->se_tpg_tfo->get_fabric_name(),
1552 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1553 lacl->initiatorname, lacl->mapped_lun);
1554
1555 return 0;
1556 }
1557
1558 void core_dev_free_initiator_node_lun_acl(
1559 struct se_portal_group *tpg,
1560 struct se_lun_acl *lacl)
1561 {
1562 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1563 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1564 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1565 tpg->se_tpg_tfo->get_fabric_name(),
1566 lacl->initiatorname, lacl->mapped_lun);
1567
1568 kfree(lacl);
1569 }
1570
1571 int core_dev_setup_virtual_lun0(void)
1572 {
1573 struct se_hba *hba;
1574 struct se_device *dev;
1575 struct se_subsystem_dev *se_dev = NULL;
1576 struct se_subsystem_api *t;
1577 char buf[16];
1578 int ret;
1579
1580 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1581 if (IS_ERR(hba))
1582 return PTR_ERR(hba);
1583
1584 lun0_hba = hba;
1585 t = hba->transport;
1586
1587 se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1588 if (!se_dev) {
1589 pr_err("Unable to allocate memory for"
1590 " struct se_subsystem_dev\n");
1591 ret = -ENOMEM;
1592 goto out;
1593 }
1594 INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1595 spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1596 INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1597 INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1598 spin_lock_init(&se_dev->t10_pr.registration_lock);
1599 spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1600 INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1601 spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1602 spin_lock_init(&se_dev->se_dev_lock);
1603 se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1604 se_dev->t10_wwn.t10_sub_dev = se_dev;
1605 se_dev->t10_alua.t10_sub_dev = se_dev;
1606 se_dev->se_dev_attrib.da_sub_dev = se_dev;
1607 se_dev->se_dev_hba = hba;
1608
1609 se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1610 if (!se_dev->se_dev_su_ptr) {
1611 pr_err("Unable to locate subsystem dependent pointer"
1612 " from allocate_virtdevice()\n");
1613 ret = -ENOMEM;
1614 goto out;
1615 }
1616 lun0_su_dev = se_dev;
1617
1618 memset(buf, 0, 16);
1619 sprintf(buf, "rd_pages=8");
1620 t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1621
1622 dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1623 if (IS_ERR(dev)) {
1624 ret = PTR_ERR(dev);
1625 goto out;
1626 }
1627 se_dev->se_dev_ptr = dev;
1628 g_lun0_dev = dev;
1629
1630 return 0;
1631 out:
1632 lun0_su_dev = NULL;
1633 kfree(se_dev);
1634 if (lun0_hba) {
1635 core_delete_hba(lun0_hba);
1636 lun0_hba = NULL;
1637 }
1638 return ret;
1639 }
1640
1641
1642 void core_dev_release_virtual_lun0(void)
1643 {
1644 struct se_hba *hba = lun0_hba;
1645 struct se_subsystem_dev *su_dev = lun0_su_dev;
1646
1647 if (!hba)
1648 return;
1649
1650 if (g_lun0_dev)
1651 se_free_virtual_device(g_lun0_dev, hba);
1652
1653 kfree(su_dev);
1654 core_delete_hba(hba);
1655 }
Linux kernel - Deliverables
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