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target: replace the processing thread with a TMR work queue
[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_update_device_list_for_node(lun, NULL, deve->mapped_lun,
304 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
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_update_device_list_for_node():
346 *
347 *
348 */
349 int core_update_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 int enable)
357 {
358 struct se_port *port = lun->lun_sep;
359 struct se_dev_entry *deve = nacl->device_list[mapped_lun];
360 int trans = 0;
361 /*
362 * If the MappedLUN entry is being disabled, the entry in
363 * port->sep_alua_list must be removed now before clearing the
364 * struct se_dev_entry pointers below as logic in
365 * core_alua_do_transition_tg_pt() depends on these being present.
366 */
367 if (!enable) {
368 /*
369 * deve->se_lun_acl will be NULL for demo-mode created LUNs
370 * that have not been explicitly concerted to MappedLUNs ->
371 * struct se_lun_acl, but we remove deve->alua_port_list from
372 * port->sep_alua_list. This also means that active UAs and
373 * NodeACL context specific PR metadata for demo-mode
374 * MappedLUN *deve will be released below..
375 */
376 spin_lock_bh(&port->sep_alua_lock);
377 list_del(&deve->alua_port_list);
378 spin_unlock_bh(&port->sep_alua_lock);
379 }
380
381 spin_lock_irq(&nacl->device_list_lock);
382 if (enable) {
383 /*
384 * Check if the call is handling demo mode -> explict LUN ACL
385 * transition. This transition must be for the same struct se_lun
386 * + mapped_lun that was setup in demo mode..
387 */
388 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
389 if (deve->se_lun_acl != NULL) {
390 pr_err("struct se_dev_entry->se_lun_acl"
391 " already set for demo mode -> explict"
392 " LUN ACL transition\n");
393 spin_unlock_irq(&nacl->device_list_lock);
394 return -EINVAL;
395 }
396 if (deve->se_lun != lun) {
397 pr_err("struct se_dev_entry->se_lun does"
398 " match passed struct se_lun for demo mode"
399 " -> explict LUN ACL transition\n");
400 spin_unlock_irq(&nacl->device_list_lock);
401 return -EINVAL;
402 }
403 deve->se_lun_acl = lun_acl;
404 trans = 1;
405 } else {
406 deve->se_lun = lun;
407 deve->se_lun_acl = lun_acl;
408 deve->mapped_lun = mapped_lun;
409 deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
410 }
411
412 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
413 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
414 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
415 } else {
416 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
417 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
418 }
419
420 if (trans) {
421 spin_unlock_irq(&nacl->device_list_lock);
422 return 0;
423 }
424 deve->creation_time = get_jiffies_64();
425 deve->attach_count++;
426 spin_unlock_irq(&nacl->device_list_lock);
427
428 spin_lock_bh(&port->sep_alua_lock);
429 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
430 spin_unlock_bh(&port->sep_alua_lock);
431
432 return 0;
433 }
434 /*
435 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
436 * PR operation to complete.
437 */
438 spin_unlock_irq(&nacl->device_list_lock);
439 while (atomic_read(&deve->pr_ref_count) != 0)
440 cpu_relax();
441 spin_lock_irq(&nacl->device_list_lock);
442 /*
443 * Disable struct se_dev_entry LUN ACL mapping
444 */
445 core_scsi3_ua_release_all(deve);
446 deve->se_lun = NULL;
447 deve->se_lun_acl = NULL;
448 deve->lun_flags = 0;
449 deve->creation_time = 0;
450 deve->attach_count--;
451 spin_unlock_irq(&nacl->device_list_lock);
452
453 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
454 return 0;
455 }
456
457 /* core_clear_lun_from_tpg():
458 *
459 *
460 */
461 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
462 {
463 struct se_node_acl *nacl;
464 struct se_dev_entry *deve;
465 u32 i;
466
467 spin_lock_irq(&tpg->acl_node_lock);
468 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
469 spin_unlock_irq(&tpg->acl_node_lock);
470
471 spin_lock_irq(&nacl->device_list_lock);
472 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
473 deve = nacl->device_list[i];
474 if (lun != deve->se_lun)
475 continue;
476 spin_unlock_irq(&nacl->device_list_lock);
477
478 core_update_device_list_for_node(lun, NULL,
479 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
480 nacl, tpg, 0);
481
482 spin_lock_irq(&nacl->device_list_lock);
483 }
484 spin_unlock_irq(&nacl->device_list_lock);
485
486 spin_lock_irq(&tpg->acl_node_lock);
487 }
488 spin_unlock_irq(&tpg->acl_node_lock);
489 }
490
491 static struct se_port *core_alloc_port(struct se_device *dev)
492 {
493 struct se_port *port, *port_tmp;
494
495 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
496 if (!port) {
497 pr_err("Unable to allocate struct se_port\n");
498 return ERR_PTR(-ENOMEM);
499 }
500 INIT_LIST_HEAD(&port->sep_alua_list);
501 INIT_LIST_HEAD(&port->sep_list);
502 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
503 spin_lock_init(&port->sep_alua_lock);
504 mutex_init(&port->sep_tg_pt_md_mutex);
505
506 spin_lock(&dev->se_port_lock);
507 if (dev->dev_port_count == 0x0000ffff) {
508 pr_warn("Reached dev->dev_port_count =="
509 " 0x0000ffff\n");
510 spin_unlock(&dev->se_port_lock);
511 return ERR_PTR(-ENOSPC);
512 }
513 again:
514 /*
515 * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
516 * Here is the table from spc4r17 section 7.7.3.8.
517 *
518 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
519 *
520 * Code Description
521 * 0h Reserved
522 * 1h Relative port 1, historically known as port A
523 * 2h Relative port 2, historically known as port B
524 * 3h to FFFFh Relative port 3 through 65 535
525 */
526 port->sep_rtpi = dev->dev_rpti_counter++;
527 if (!port->sep_rtpi)
528 goto again;
529
530 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
531 /*
532 * Make sure RELATIVE TARGET PORT IDENTIFER is unique
533 * for 16-bit wrap..
534 */
535 if (port->sep_rtpi == port_tmp->sep_rtpi)
536 goto again;
537 }
538 spin_unlock(&dev->se_port_lock);
539
540 return port;
541 }
542
543 static void core_export_port(
544 struct se_device *dev,
545 struct se_portal_group *tpg,
546 struct se_port *port,
547 struct se_lun *lun)
548 {
549 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
550 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
551
552 spin_lock(&dev->se_port_lock);
553 spin_lock(&lun->lun_sep_lock);
554 port->sep_tpg = tpg;
555 port->sep_lun = lun;
556 lun->lun_sep = port;
557 spin_unlock(&lun->lun_sep_lock);
558
559 list_add_tail(&port->sep_list, &dev->dev_sep_list);
560 spin_unlock(&dev->se_port_lock);
561
562 if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
563 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
564 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
565 pr_err("Unable to allocate t10_alua_tg_pt"
566 "_gp_member_t\n");
567 return;
568 }
569 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
570 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
571 su_dev->t10_alua.default_tg_pt_gp);
572 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
573 pr_debug("%s/%s: Adding to default ALUA Target Port"
574 " Group: alua/default_tg_pt_gp\n",
575 dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
576 }
577
578 dev->dev_port_count++;
579 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
580 }
581
582 /*
583 * Called with struct se_device->se_port_lock spinlock held.
584 */
585 static void core_release_port(struct se_device *dev, struct se_port *port)
586 __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
587 {
588 /*
589 * Wait for any port reference for PR ALL_TG_PT=1 operation
590 * to complete in __core_scsi3_alloc_registration()
591 */
592 spin_unlock(&dev->se_port_lock);
593 if (atomic_read(&port->sep_tg_pt_ref_cnt))
594 cpu_relax();
595 spin_lock(&dev->se_port_lock);
596
597 core_alua_free_tg_pt_gp_mem(port);
598
599 list_del(&port->sep_list);
600 dev->dev_port_count--;
601 kfree(port);
602 }
603
604 int core_dev_export(
605 struct se_device *dev,
606 struct se_portal_group *tpg,
607 struct se_lun *lun)
608 {
609 struct se_port *port;
610
611 port = core_alloc_port(dev);
612 if (IS_ERR(port))
613 return PTR_ERR(port);
614
615 lun->lun_se_dev = dev;
616 se_dev_start(dev);
617
618 atomic_inc(&dev->dev_export_obj.obj_access_count);
619 core_export_port(dev, tpg, port, lun);
620 return 0;
621 }
622
623 void core_dev_unexport(
624 struct se_device *dev,
625 struct se_portal_group *tpg,
626 struct se_lun *lun)
627 {
628 struct se_port *port = lun->lun_sep;
629
630 spin_lock(&lun->lun_sep_lock);
631 if (lun->lun_se_dev == NULL) {
632 spin_unlock(&lun->lun_sep_lock);
633 return;
634 }
635 spin_unlock(&lun->lun_sep_lock);
636
637 spin_lock(&dev->se_port_lock);
638 atomic_dec(&dev->dev_export_obj.obj_access_count);
639 core_release_port(dev, port);
640 spin_unlock(&dev->se_port_lock);
641
642 se_dev_stop(dev);
643 lun->lun_se_dev = NULL;
644 }
645
646 int target_report_luns(struct se_cmd *se_cmd)
647 {
648 struct se_dev_entry *deve;
649 struct se_session *se_sess = se_cmd->se_sess;
650 unsigned char *buf;
651 u32 lun_count = 0, offset = 8, i;
652
653 buf = transport_kmap_data_sg(se_cmd);
654 if (!buf)
655 return -ENOMEM;
656
657 /*
658 * If no struct se_session pointer is present, this struct se_cmd is
659 * coming via a target_core_mod PASSTHROUGH op, and not through
660 * a $FABRIC_MOD. In that case, report LUN=0 only.
661 */
662 if (!se_sess) {
663 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
664 lun_count = 1;
665 goto done;
666 }
667
668 spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
669 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
670 deve = se_sess->se_node_acl->device_list[i];
671 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
672 continue;
673 /*
674 * We determine the correct LUN LIST LENGTH even once we
675 * have reached the initial allocation length.
676 * See SPC2-R20 7.19.
677 */
678 lun_count++;
679 if ((offset + 8) > se_cmd->data_length)
680 continue;
681
682 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
683 offset += 8;
684 }
685 spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
686
687 /*
688 * See SPC3 r07, page 159.
689 */
690 done:
691 lun_count *= 8;
692 buf[0] = ((lun_count >> 24) & 0xff);
693 buf[1] = ((lun_count >> 16) & 0xff);
694 buf[2] = ((lun_count >> 8) & 0xff);
695 buf[3] = (lun_count & 0xff);
696 transport_kunmap_data_sg(se_cmd);
697
698 target_complete_cmd(se_cmd, GOOD);
699 return 0;
700 }
701
702 /* se_release_device_for_hba():
703 *
704 *
705 */
706 void se_release_device_for_hba(struct se_device *dev)
707 {
708 struct se_hba *hba = dev->se_hba;
709
710 if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
711 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
712 (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
713 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
714 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
715 se_dev_stop(dev);
716
717 if (dev->dev_ptr) {
718 destroy_workqueue(dev->tmr_wq);
719 if (dev->transport->free_device)
720 dev->transport->free_device(dev->dev_ptr);
721 }
722
723 spin_lock(&hba->device_lock);
724 list_del(&dev->dev_list);
725 hba->dev_count--;
726 spin_unlock(&hba->device_lock);
727
728 core_scsi3_free_all_registrations(dev);
729 se_release_vpd_for_dev(dev);
730
731 kfree(dev);
732 }
733
734 void se_release_vpd_for_dev(struct se_device *dev)
735 {
736 struct t10_vpd *vpd, *vpd_tmp;
737
738 spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
739 list_for_each_entry_safe(vpd, vpd_tmp,
740 &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
741 list_del(&vpd->vpd_list);
742 kfree(vpd);
743 }
744 spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
745 }
746
747 /* se_free_virtual_device():
748 *
749 * Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
750 */
751 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
752 {
753 if (!list_empty(&dev->dev_sep_list))
754 dump_stack();
755
756 core_alua_free_lu_gp_mem(dev);
757 se_release_device_for_hba(dev);
758
759 return 0;
760 }
761
762 static void se_dev_start(struct se_device *dev)
763 {
764 struct se_hba *hba = dev->se_hba;
765
766 spin_lock(&hba->device_lock);
767 atomic_inc(&dev->dev_obj.obj_access_count);
768 if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
769 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
770 dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
771 dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
772 } else if (dev->dev_status &
773 TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
774 dev->dev_status &=
775 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
776 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
777 }
778 }
779 spin_unlock(&hba->device_lock);
780 }
781
782 static void se_dev_stop(struct se_device *dev)
783 {
784 struct se_hba *hba = dev->se_hba;
785
786 spin_lock(&hba->device_lock);
787 atomic_dec(&dev->dev_obj.obj_access_count);
788 if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
789 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
790 dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
791 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
792 } else if (dev->dev_status &
793 TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
794 dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
795 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
796 }
797 }
798 spin_unlock(&hba->device_lock);
799 }
800
801 int se_dev_check_online(struct se_device *dev)
802 {
803 unsigned long flags;
804 int ret;
805
806 spin_lock_irqsave(&dev->dev_status_lock, flags);
807 ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
808 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
809 spin_unlock_irqrestore(&dev->dev_status_lock, flags);
810
811 return ret;
812 }
813
814 int se_dev_check_shutdown(struct se_device *dev)
815 {
816 int ret;
817
818 spin_lock_irq(&dev->dev_status_lock);
819 ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
820 spin_unlock_irq(&dev->dev_status_lock);
821
822 return ret;
823 }
824
825 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
826 {
827 u32 tmp, aligned_max_sectors;
828 /*
829 * Limit max_sectors to a PAGE_SIZE aligned value for modern
830 * transport_allocate_data_tasks() operation.
831 */
832 tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
833 aligned_max_sectors = (tmp / block_size);
834 if (max_sectors != aligned_max_sectors) {
835 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
836 " to %u\n", max_sectors, aligned_max_sectors);
837 return aligned_max_sectors;
838 }
839
840 return max_sectors;
841 }
842
843 void se_dev_set_default_attribs(
844 struct se_device *dev,
845 struct se_dev_limits *dev_limits)
846 {
847 struct queue_limits *limits = &dev_limits->limits;
848
849 dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
850 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
851 dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
852 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
853 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
854 dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
855 dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
856 dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
857 dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
858 dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
859 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
860 dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
861 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
862 /*
863 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
864 * iblock_create_virtdevice() from struct queue_limits values
865 * if blk_queue_discard()==1
866 */
867 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
868 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
869 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
870 dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
871 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
872 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
873 /*
874 * block_size is based on subsystem plugin dependent requirements.
875 */
876 dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
877 dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
878 /*
879 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
880 */
881 limits->max_hw_sectors = se_dev_align_max_sectors(limits->max_hw_sectors,
882 limits->logical_block_size);
883 dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
884
885 /*
886 * Set fabric_max_sectors, which is reported in block limits
887 * VPD page (B0h).
888 */
889 dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
890 /*
891 * Set optimal_sectors from fabric_max_sectors, which can be
892 * lowered via configfs.
893 */
894 dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
895 /*
896 * queue_depth is based on subsystem plugin dependent requirements.
897 */
898 dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
899 dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
900 }
901
902 int se_dev_set_max_unmap_lba_count(
903 struct se_device *dev,
904 u32 max_unmap_lba_count)
905 {
906 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
907 pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
908 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
909 return 0;
910 }
911
912 int se_dev_set_max_unmap_block_desc_count(
913 struct se_device *dev,
914 u32 max_unmap_block_desc_count)
915 {
916 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
917 max_unmap_block_desc_count;
918 pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
919 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
920 return 0;
921 }
922
923 int se_dev_set_unmap_granularity(
924 struct se_device *dev,
925 u32 unmap_granularity)
926 {
927 dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
928 pr_debug("dev[%p]: Set unmap_granularity: %u\n",
929 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
930 return 0;
931 }
932
933 int se_dev_set_unmap_granularity_alignment(
934 struct se_device *dev,
935 u32 unmap_granularity_alignment)
936 {
937 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
938 pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
939 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
940 return 0;
941 }
942
943 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
944 {
945 if (flag != 0 && flag != 1) {
946 pr_err("Illegal value %d\n", flag);
947 return -EINVAL;
948 }
949
950 if (flag) {
951 pr_err("dpo_emulated not supported\n");
952 return -EINVAL;
953 }
954
955 return 0;
956 }
957
958 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
959 {
960 if (flag != 0 && flag != 1) {
961 pr_err("Illegal value %d\n", flag);
962 return -EINVAL;
963 }
964
965 if (flag && dev->transport->fua_write_emulated == 0) {
966 pr_err("fua_write_emulated not supported\n");
967 return -EINVAL;
968 }
969 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
970 pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
971 dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
972 return 0;
973 }
974
975 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
976 {
977 if (flag != 0 && flag != 1) {
978 pr_err("Illegal value %d\n", flag);
979 return -EINVAL;
980 }
981
982 if (flag) {
983 pr_err("ua read emulated not supported\n");
984 return -EINVAL;
985 }
986
987 return 0;
988 }
989
990 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
991 {
992 if (flag != 0 && flag != 1) {
993 pr_err("Illegal value %d\n", flag);
994 return -EINVAL;
995 }
996 if (flag && dev->transport->write_cache_emulated == 0) {
997 pr_err("write_cache_emulated not supported\n");
998 return -EINVAL;
999 }
1000 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1001 pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1002 dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1003 return 0;
1004 }
1005
1006 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1007 {
1008 if ((flag != 0) && (flag != 1) && (flag != 2)) {
1009 pr_err("Illegal value %d\n", flag);
1010 return -EINVAL;
1011 }
1012
1013 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1014 pr_err("dev[%p]: Unable to change SE Device"
1015 " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1016 " exists\n", dev,
1017 atomic_read(&dev->dev_export_obj.obj_access_count));
1018 return -EINVAL;
1019 }
1020 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1021 pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1022 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1023
1024 return 0;
1025 }
1026
1027 int se_dev_set_emulate_tas(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
1034 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1035 pr_err("dev[%p]: Unable to change SE Device TAS while"
1036 " dev_export_obj: %d count exists\n", dev,
1037 atomic_read(&dev->dev_export_obj.obj_access_count));
1038 return -EINVAL;
1039 }
1040 dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1041 pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1042 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1043
1044 return 0;
1045 }
1046
1047 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1048 {
1049 if ((flag != 0) && (flag != 1)) {
1050 pr_err("Illegal value %d\n", flag);
1051 return -EINVAL;
1052 }
1053 /*
1054 * We expect this value to be non-zero when generic Block Layer
1055 * Discard supported is detected iblock_create_virtdevice().
1056 */
1057 if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1058 pr_err("Generic Block Discard not supported\n");
1059 return -ENOSYS;
1060 }
1061
1062 dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1063 pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1064 dev, flag);
1065 return 0;
1066 }
1067
1068 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1069 {
1070 if ((flag != 0) && (flag != 1)) {
1071 pr_err("Illegal value %d\n", flag);
1072 return -EINVAL;
1073 }
1074 /*
1075 * We expect this value to be non-zero when generic Block Layer
1076 * Discard supported is detected iblock_create_virtdevice().
1077 */
1078 if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1079 pr_err("Generic Block Discard not supported\n");
1080 return -ENOSYS;
1081 }
1082
1083 dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1084 pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1085 dev, flag);
1086 return 0;
1087 }
1088
1089 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1090 {
1091 if ((flag != 0) && (flag != 1)) {
1092 pr_err("Illegal value %d\n", flag);
1093 return -EINVAL;
1094 }
1095 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1096 pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1097 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1098 return 0;
1099 }
1100
1101 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1102 {
1103 if ((flag != 0) && (flag != 1)) {
1104 printk(KERN_ERR "Illegal value %d\n", flag);
1105 return -EINVAL;
1106 }
1107 dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1108 pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1109 dev, flag);
1110 return 0;
1111 }
1112
1113 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1114 {
1115 if (flag != 0) {
1116 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1117 " reordering not implemented\n", dev);
1118 return -ENOSYS;
1119 }
1120 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1121 pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1122 return 0;
1123 }
1124
1125 /*
1126 * Note, this can only be called on unexported SE Device Object.
1127 */
1128 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1129 {
1130 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1131 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1132 " dev_export_obj: %d count exists\n", dev,
1133 atomic_read(&dev->dev_export_obj.obj_access_count));
1134 return -EINVAL;
1135 }
1136 if (!queue_depth) {
1137 pr_err("dev[%p]: Illegal ZERO value for queue"
1138 "_depth\n", dev);
1139 return -EINVAL;
1140 }
1141
1142 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1143 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1144 pr_err("dev[%p]: Passed queue_depth: %u"
1145 " exceeds TCM/SE_Device TCQ: %u\n",
1146 dev, queue_depth,
1147 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1148 return -EINVAL;
1149 }
1150 } else {
1151 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1152 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1153 pr_err("dev[%p]: Passed queue_depth:"
1154 " %u exceeds TCM/SE_Device MAX"
1155 " TCQ: %u\n", dev, queue_depth,
1156 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1157 return -EINVAL;
1158 }
1159 }
1160 }
1161
1162 dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1163 pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1164 dev, queue_depth);
1165 return 0;
1166 }
1167
1168 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1169 {
1170 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1171 pr_err("dev[%p]: Unable to change SE Device"
1172 " fabric_max_sectors while dev_export_obj: %d count exists\n",
1173 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1174 return -EINVAL;
1175 }
1176 if (!fabric_max_sectors) {
1177 pr_err("dev[%p]: Illegal ZERO value for"
1178 " fabric_max_sectors\n", dev);
1179 return -EINVAL;
1180 }
1181 if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1182 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1183 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1184 DA_STATUS_MAX_SECTORS_MIN);
1185 return -EINVAL;
1186 }
1187 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1188 if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1189 pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1190 " greater than TCM/SE_Device max_sectors:"
1191 " %u\n", dev, fabric_max_sectors,
1192 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1193 return -EINVAL;
1194 }
1195 } else {
1196 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1197 pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1198 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1199 " %u\n", dev, fabric_max_sectors,
1200 DA_STATUS_MAX_SECTORS_MAX);
1201 return -EINVAL;
1202 }
1203 }
1204 /*
1205 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1206 */
1207 fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1208 dev->se_sub_dev->se_dev_attrib.block_size);
1209
1210 dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1211 pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1212 dev, fabric_max_sectors);
1213 return 0;
1214 }
1215
1216 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1217 {
1218 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1219 pr_err("dev[%p]: Unable to change SE Device"
1220 " optimal_sectors while dev_export_obj: %d count exists\n",
1221 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1222 return -EINVAL;
1223 }
1224 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1225 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1226 " changed for TCM/pSCSI\n", dev);
1227 return -EINVAL;
1228 }
1229 if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1230 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1231 " greater than fabric_max_sectors: %u\n", dev,
1232 optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1233 return -EINVAL;
1234 }
1235
1236 dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1237 pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1238 dev, optimal_sectors);
1239 return 0;
1240 }
1241
1242 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1243 {
1244 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1245 pr_err("dev[%p]: Unable to change SE Device block_size"
1246 " while dev_export_obj: %d count exists\n", dev,
1247 atomic_read(&dev->dev_export_obj.obj_access_count));
1248 return -EINVAL;
1249 }
1250
1251 if ((block_size != 512) &&
1252 (block_size != 1024) &&
1253 (block_size != 2048) &&
1254 (block_size != 4096)) {
1255 pr_err("dev[%p]: Illegal value for block_device: %u"
1256 " for SE device, must be 512, 1024, 2048 or 4096\n",
1257 dev, block_size);
1258 return -EINVAL;
1259 }
1260
1261 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1262 pr_err("dev[%p]: Not allowed to change block_size for"
1263 " Physical Device, use for Linux/SCSI to change"
1264 " block_size for underlying hardware\n", dev);
1265 return -EINVAL;
1266 }
1267
1268 dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1269 pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1270 dev, block_size);
1271 return 0;
1272 }
1273
1274 struct se_lun *core_dev_add_lun(
1275 struct se_portal_group *tpg,
1276 struct se_hba *hba,
1277 struct se_device *dev,
1278 u32 lun)
1279 {
1280 struct se_lun *lun_p;
1281 int rc;
1282
1283 if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1284 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1285 atomic_read(&dev->dev_access_obj.obj_access_count));
1286 return ERR_PTR(-EACCES);
1287 }
1288
1289 lun_p = core_tpg_pre_addlun(tpg, lun);
1290 if (IS_ERR(lun_p))
1291 return lun_p;
1292
1293 rc = core_tpg_post_addlun(tpg, lun_p,
1294 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1295 if (rc < 0)
1296 return ERR_PTR(rc);
1297
1298 pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1299 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1300 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1301 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1302 /*
1303 * Update LUN maps for dynamically added initiators when
1304 * generate_node_acl is enabled.
1305 */
1306 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1307 struct se_node_acl *acl;
1308 spin_lock_irq(&tpg->acl_node_lock);
1309 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1310 if (acl->dynamic_node_acl &&
1311 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1312 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1313 spin_unlock_irq(&tpg->acl_node_lock);
1314 core_tpg_add_node_to_devs(acl, tpg);
1315 spin_lock_irq(&tpg->acl_node_lock);
1316 }
1317 }
1318 spin_unlock_irq(&tpg->acl_node_lock);
1319 }
1320
1321 return lun_p;
1322 }
1323
1324 /* core_dev_del_lun():
1325 *
1326 *
1327 */
1328 int core_dev_del_lun(
1329 struct se_portal_group *tpg,
1330 u32 unpacked_lun)
1331 {
1332 struct se_lun *lun;
1333
1334 lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1335 if (IS_ERR(lun))
1336 return PTR_ERR(lun);
1337
1338 core_tpg_post_dellun(tpg, lun);
1339
1340 pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1341 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1342 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1343 tpg->se_tpg_tfo->get_fabric_name());
1344
1345 return 0;
1346 }
1347
1348 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1349 {
1350 struct se_lun *lun;
1351
1352 spin_lock(&tpg->tpg_lun_lock);
1353 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1354 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1355 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1356 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1357 TRANSPORT_MAX_LUNS_PER_TPG-1,
1358 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1359 spin_unlock(&tpg->tpg_lun_lock);
1360 return NULL;
1361 }
1362 lun = tpg->tpg_lun_list[unpacked_lun];
1363
1364 if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1365 pr_err("%s Logical Unit Number: %u is not free on"
1366 " Target Portal Group: %hu, ignoring request.\n",
1367 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1368 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1369 spin_unlock(&tpg->tpg_lun_lock);
1370 return NULL;
1371 }
1372 spin_unlock(&tpg->tpg_lun_lock);
1373
1374 return lun;
1375 }
1376
1377 /* core_dev_get_lun():
1378 *
1379 *
1380 */
1381 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1382 {
1383 struct se_lun *lun;
1384
1385 spin_lock(&tpg->tpg_lun_lock);
1386 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1387 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1388 "_TPG-1: %u for Target Portal Group: %hu\n",
1389 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1390 TRANSPORT_MAX_LUNS_PER_TPG-1,
1391 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1392 spin_unlock(&tpg->tpg_lun_lock);
1393 return NULL;
1394 }
1395 lun = tpg->tpg_lun_list[unpacked_lun];
1396
1397 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1398 pr_err("%s Logical Unit Number: %u is not active on"
1399 " Target Portal Group: %hu, ignoring request.\n",
1400 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1401 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1402 spin_unlock(&tpg->tpg_lun_lock);
1403 return NULL;
1404 }
1405 spin_unlock(&tpg->tpg_lun_lock);
1406
1407 return lun;
1408 }
1409
1410 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1411 struct se_portal_group *tpg,
1412 u32 mapped_lun,
1413 char *initiatorname,
1414 int *ret)
1415 {
1416 struct se_lun_acl *lacl;
1417 struct se_node_acl *nacl;
1418
1419 if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1420 pr_err("%s InitiatorName exceeds maximum size.\n",
1421 tpg->se_tpg_tfo->get_fabric_name());
1422 *ret = -EOVERFLOW;
1423 return NULL;
1424 }
1425 nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1426 if (!nacl) {
1427 *ret = -EINVAL;
1428 return NULL;
1429 }
1430 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1431 if (!lacl) {
1432 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1433 *ret = -ENOMEM;
1434 return NULL;
1435 }
1436
1437 INIT_LIST_HEAD(&lacl->lacl_list);
1438 lacl->mapped_lun = mapped_lun;
1439 lacl->se_lun_nacl = nacl;
1440 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1441
1442 return lacl;
1443 }
1444
1445 int core_dev_add_initiator_node_lun_acl(
1446 struct se_portal_group *tpg,
1447 struct se_lun_acl *lacl,
1448 u32 unpacked_lun,
1449 u32 lun_access)
1450 {
1451 struct se_lun *lun;
1452 struct se_node_acl *nacl;
1453
1454 lun = core_dev_get_lun(tpg, unpacked_lun);
1455 if (!lun) {
1456 pr_err("%s Logical Unit Number: %u is not active on"
1457 " Target Portal Group: %hu, ignoring request.\n",
1458 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1459 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1460 return -EINVAL;
1461 }
1462
1463 nacl = lacl->se_lun_nacl;
1464 if (!nacl)
1465 return -EINVAL;
1466
1467 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1468 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1469 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1470
1471 lacl->se_lun = lun;
1472
1473 if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1474 lun_access, nacl, tpg, 1) < 0)
1475 return -EINVAL;
1476
1477 spin_lock(&lun->lun_acl_lock);
1478 list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1479 atomic_inc(&lun->lun_acl_count);
1480 smp_mb__after_atomic_inc();
1481 spin_unlock(&lun->lun_acl_lock);
1482
1483 pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1484 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1485 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1486 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1487 lacl->initiatorname);
1488 /*
1489 * Check to see if there are any existing persistent reservation APTPL
1490 * pre-registrations that need to be enabled for this LUN ACL..
1491 */
1492 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1493 return 0;
1494 }
1495
1496 /* core_dev_del_initiator_node_lun_acl():
1497 *
1498 *
1499 */
1500 int core_dev_del_initiator_node_lun_acl(
1501 struct se_portal_group *tpg,
1502 struct se_lun *lun,
1503 struct se_lun_acl *lacl)
1504 {
1505 struct se_node_acl *nacl;
1506
1507 nacl = lacl->se_lun_nacl;
1508 if (!nacl)
1509 return -EINVAL;
1510
1511 spin_lock(&lun->lun_acl_lock);
1512 list_del(&lacl->lacl_list);
1513 atomic_dec(&lun->lun_acl_count);
1514 smp_mb__after_atomic_dec();
1515 spin_unlock(&lun->lun_acl_lock);
1516
1517 core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1518 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1519
1520 lacl->se_lun = NULL;
1521
1522 pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1523 " InitiatorNode: %s Mapped LUN: %u\n",
1524 tpg->se_tpg_tfo->get_fabric_name(),
1525 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1526 lacl->initiatorname, lacl->mapped_lun);
1527
1528 return 0;
1529 }
1530
1531 void core_dev_free_initiator_node_lun_acl(
1532 struct se_portal_group *tpg,
1533 struct se_lun_acl *lacl)
1534 {
1535 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1536 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1537 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1538 tpg->se_tpg_tfo->get_fabric_name(),
1539 lacl->initiatorname, lacl->mapped_lun);
1540
1541 kfree(lacl);
1542 }
1543
1544 int core_dev_setup_virtual_lun0(void)
1545 {
1546 struct se_hba *hba;
1547 struct se_device *dev;
1548 struct se_subsystem_dev *se_dev = NULL;
1549 struct se_subsystem_api *t;
1550 char buf[16];
1551 int ret;
1552
1553 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1554 if (IS_ERR(hba))
1555 return PTR_ERR(hba);
1556
1557 lun0_hba = hba;
1558 t = hba->transport;
1559
1560 se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1561 if (!se_dev) {
1562 pr_err("Unable to allocate memory for"
1563 " struct se_subsystem_dev\n");
1564 ret = -ENOMEM;
1565 goto out;
1566 }
1567 INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1568 spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1569 INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1570 INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1571 spin_lock_init(&se_dev->t10_pr.registration_lock);
1572 spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1573 INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1574 spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1575 spin_lock_init(&se_dev->se_dev_lock);
1576 se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1577 se_dev->t10_wwn.t10_sub_dev = se_dev;
1578 se_dev->t10_alua.t10_sub_dev = se_dev;
1579 se_dev->se_dev_attrib.da_sub_dev = se_dev;
1580 se_dev->se_dev_hba = hba;
1581
1582 se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1583 if (!se_dev->se_dev_su_ptr) {
1584 pr_err("Unable to locate subsystem dependent pointer"
1585 " from allocate_virtdevice()\n");
1586 ret = -ENOMEM;
1587 goto out;
1588 }
1589 lun0_su_dev = se_dev;
1590
1591 memset(buf, 0, 16);
1592 sprintf(buf, "rd_pages=8");
1593 t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1594
1595 dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1596 if (IS_ERR(dev)) {
1597 ret = PTR_ERR(dev);
1598 goto out;
1599 }
1600 se_dev->se_dev_ptr = dev;
1601 g_lun0_dev = dev;
1602
1603 return 0;
1604 out:
1605 lun0_su_dev = NULL;
1606 kfree(se_dev);
1607 if (lun0_hba) {
1608 core_delete_hba(lun0_hba);
1609 lun0_hba = NULL;
1610 }
1611 return ret;
1612 }
1613
1614
1615 void core_dev_release_virtual_lun0(void)
1616 {
1617 struct se_hba *hba = lun0_hba;
1618 struct se_subsystem_dev *su_dev = lun0_su_dev;
1619
1620 if (!hba)
1621 return;
1622
1623 if (g_lun0_dev)
1624 se_free_virtual_device(g_lun0_dev, hba);
1625
1626 kfree(su_dev);
1627 core_delete_hba(hba);
1628 }
Linux kernel - Deliverables
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