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Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad...
[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_device.h>
46 #include <target/target_core_tpg.h>
47 #include <target/target_core_transport.h>
48 #include <target/target_core_fabric_ops.h>
49
50 #include "target_core_alua.h"
51 #include "target_core_hba.h"
52 #include "target_core_pr.h"
53 #include "target_core_ua.h"
54
55 static void se_dev_start(struct se_device *dev);
56 static void se_dev_stop(struct se_device *dev);
57
58 static struct se_hba *lun0_hba;
59 static struct se_subsystem_dev *lun0_su_dev;
60 /* not static, needed by tpg.c */
61 struct se_device *g_lun0_dev;
62
63 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
64 {
65 struct se_lun *se_lun = NULL;
66 struct se_session *se_sess = se_cmd->se_sess;
67 struct se_device *dev;
68 unsigned long flags;
69
70 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
71 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
72 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
73 return -ENODEV;
74 }
75
76 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
77 se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
78 if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
79 struct se_dev_entry *deve = se_cmd->se_deve;
80
81 deve->total_cmds++;
82 deve->total_bytes += se_cmd->data_length;
83
84 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
85 (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
86 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
87 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
88 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
89 " Access for 0x%08x\n",
90 se_cmd->se_tfo->get_fabric_name(),
91 unpacked_lun);
92 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
93 return -EACCES;
94 }
95
96 if (se_cmd->data_direction == DMA_TO_DEVICE)
97 deve->write_bytes += se_cmd->data_length;
98 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
99 deve->read_bytes += se_cmd->data_length;
100
101 deve->deve_cmds++;
102
103 se_lun = deve->se_lun;
104 se_cmd->se_lun = deve->se_lun;
105 se_cmd->pr_res_key = deve->pr_res_key;
106 se_cmd->orig_fe_lun = unpacked_lun;
107 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
108 }
109 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
110
111 if (!se_lun) {
112 /*
113 * Use the se_portal_group->tpg_virt_lun0 to allow for
114 * REPORT_LUNS, et al to be returned when no active
115 * MappedLUN=0 exists for this Initiator Port.
116 */
117 if (unpacked_lun != 0) {
118 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
119 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
120 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
121 " Access for 0x%08x\n",
122 se_cmd->se_tfo->get_fabric_name(),
123 unpacked_lun);
124 return -ENODEV;
125 }
126 /*
127 * Force WRITE PROTECT for virtual LUN 0
128 */
129 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
130 (se_cmd->data_direction != DMA_NONE)) {
131 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
132 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
133 return -EACCES;
134 }
135
136 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
137 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
138 se_cmd->orig_fe_lun = 0;
139 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
140 }
141 /*
142 * Determine if the struct se_lun is online.
143 * FIXME: Check for LUN_RESET + UNIT Attention
144 */
145 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
146 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
147 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
148 return -ENODEV;
149 }
150
151 /* Directly associate cmd with se_dev */
152 se_cmd->se_dev = se_lun->lun_se_dev;
153
154 /* TODO: get rid of this and use atomics for stats */
155 dev = se_lun->lun_se_dev;
156 spin_lock_irqsave(&dev->stats_lock, flags);
157 dev->num_cmds++;
158 if (se_cmd->data_direction == DMA_TO_DEVICE)
159 dev->write_bytes += se_cmd->data_length;
160 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
161 dev->read_bytes += se_cmd->data_length;
162 spin_unlock_irqrestore(&dev->stats_lock, flags);
163
164 /*
165 * Add the iscsi_cmd_t to the struct se_lun's cmd list. This list is used
166 * for tracking state of struct se_cmds during LUN shutdown events.
167 */
168 spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
169 list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
170 atomic_set(&se_cmd->transport_lun_active, 1);
171 spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
172
173 return 0;
174 }
175 EXPORT_SYMBOL(transport_lookup_cmd_lun);
176
177 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
178 {
179 struct se_dev_entry *deve;
180 struct se_lun *se_lun = NULL;
181 struct se_session *se_sess = se_cmd->se_sess;
182 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
183 unsigned long flags;
184
185 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
186 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
187 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
188 return -ENODEV;
189 }
190
191 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
192 se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
193 deve = se_cmd->se_deve;
194
195 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
196 se_tmr->tmr_lun = deve->se_lun;
197 se_cmd->se_lun = deve->se_lun;
198 se_lun = deve->se_lun;
199 se_cmd->pr_res_key = deve->pr_res_key;
200 se_cmd->orig_fe_lun = unpacked_lun;
201 }
202 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
203
204 if (!se_lun) {
205 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
206 " Access for 0x%08x\n",
207 se_cmd->se_tfo->get_fabric_name(),
208 unpacked_lun);
209 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
210 return -ENODEV;
211 }
212 /*
213 * Determine if the struct se_lun is online.
214 * FIXME: Check for LUN_RESET + UNIT Attention
215 */
216 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
217 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
218 return -ENODEV;
219 }
220
221 /* Directly associate cmd with se_dev */
222 se_cmd->se_dev = se_lun->lun_se_dev;
223 se_tmr->tmr_dev = se_lun->lun_se_dev;
224
225 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
226 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
227 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
228
229 return 0;
230 }
231 EXPORT_SYMBOL(transport_lookup_tmr_lun);
232
233 /*
234 * This function is called from core_scsi3_emulate_pro_register_and_move()
235 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
236 * when a matching rtpi is found.
237 */
238 struct se_dev_entry *core_get_se_deve_from_rtpi(
239 struct se_node_acl *nacl,
240 u16 rtpi)
241 {
242 struct se_dev_entry *deve;
243 struct se_lun *lun;
244 struct se_port *port;
245 struct se_portal_group *tpg = nacl->se_tpg;
246 u32 i;
247
248 spin_lock_irq(&nacl->device_list_lock);
249 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
250 deve = &nacl->device_list[i];
251
252 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
253 continue;
254
255 lun = deve->se_lun;
256 if (!lun) {
257 pr_err("%s device entries device pointer is"
258 " NULL, but Initiator has access.\n",
259 tpg->se_tpg_tfo->get_fabric_name());
260 continue;
261 }
262 port = lun->lun_sep;
263 if (!port) {
264 pr_err("%s device entries device pointer is"
265 " NULL, but Initiator has access.\n",
266 tpg->se_tpg_tfo->get_fabric_name());
267 continue;
268 }
269 if (port->sep_rtpi != rtpi)
270 continue;
271
272 atomic_inc(&deve->pr_ref_count);
273 smp_mb__after_atomic_inc();
274 spin_unlock_irq(&nacl->device_list_lock);
275
276 return deve;
277 }
278 spin_unlock_irq(&nacl->device_list_lock);
279
280 return NULL;
281 }
282
283 int core_free_device_list_for_node(
284 struct se_node_acl *nacl,
285 struct se_portal_group *tpg)
286 {
287 struct se_dev_entry *deve;
288 struct se_lun *lun;
289 u32 i;
290
291 if (!nacl->device_list)
292 return 0;
293
294 spin_lock_irq(&nacl->device_list_lock);
295 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
296 deve = &nacl->device_list[i];
297
298 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
299 continue;
300
301 if (!deve->se_lun) {
302 pr_err("%s device entries device pointer is"
303 " NULL, but Initiator has access.\n",
304 tpg->se_tpg_tfo->get_fabric_name());
305 continue;
306 }
307 lun = deve->se_lun;
308
309 spin_unlock_irq(&nacl->device_list_lock);
310 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
311 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
312 spin_lock_irq(&nacl->device_list_lock);
313 }
314 spin_unlock_irq(&nacl->device_list_lock);
315
316 kfree(nacl->device_list);
317 nacl->device_list = NULL;
318
319 return 0;
320 }
321
322 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
323 {
324 struct se_dev_entry *deve;
325
326 spin_lock_irq(&se_nacl->device_list_lock);
327 deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
328 deve->deve_cmds--;
329 spin_unlock_irq(&se_nacl->device_list_lock);
330 }
331
332 void core_update_device_list_access(
333 u32 mapped_lun,
334 u32 lun_access,
335 struct se_node_acl *nacl)
336 {
337 struct se_dev_entry *deve;
338
339 spin_lock_irq(&nacl->device_list_lock);
340 deve = &nacl->device_list[mapped_lun];
341 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
342 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
343 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
344 } else {
345 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
346 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
347 }
348 spin_unlock_irq(&nacl->device_list_lock);
349 }
350
351 /* core_update_device_list_for_node():
352 *
353 *
354 */
355 int core_update_device_list_for_node(
356 struct se_lun *lun,
357 struct se_lun_acl *lun_acl,
358 u32 mapped_lun,
359 u32 lun_access,
360 struct se_node_acl *nacl,
361 struct se_portal_group *tpg,
362 int enable)
363 {
364 struct se_port *port = lun->lun_sep;
365 struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
366 int trans = 0;
367 /*
368 * If the MappedLUN entry is being disabled, the entry in
369 * port->sep_alua_list must be removed now before clearing the
370 * struct se_dev_entry pointers below as logic in
371 * core_alua_do_transition_tg_pt() depends on these being present.
372 */
373 if (!enable) {
374 /*
375 * deve->se_lun_acl will be NULL for demo-mode created LUNs
376 * that have not been explicitly concerted to MappedLUNs ->
377 * struct se_lun_acl, but we remove deve->alua_port_list from
378 * port->sep_alua_list. This also means that active UAs and
379 * NodeACL context specific PR metadata for demo-mode
380 * MappedLUN *deve will be released below..
381 */
382 spin_lock_bh(&port->sep_alua_lock);
383 list_del(&deve->alua_port_list);
384 spin_unlock_bh(&port->sep_alua_lock);
385 }
386
387 spin_lock_irq(&nacl->device_list_lock);
388 if (enable) {
389 /*
390 * Check if the call is handling demo mode -> explict LUN ACL
391 * transition. This transition must be for the same struct se_lun
392 * + mapped_lun that was setup in demo mode..
393 */
394 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
395 if (deve->se_lun_acl != NULL) {
396 pr_err("struct se_dev_entry->se_lun_acl"
397 " already set for demo mode -> explict"
398 " LUN ACL transition\n");
399 spin_unlock_irq(&nacl->device_list_lock);
400 return -EINVAL;
401 }
402 if (deve->se_lun != lun) {
403 pr_err("struct se_dev_entry->se_lun does"
404 " match passed struct se_lun for demo mode"
405 " -> explict LUN ACL transition\n");
406 spin_unlock_irq(&nacl->device_list_lock);
407 return -EINVAL;
408 }
409 deve->se_lun_acl = lun_acl;
410 trans = 1;
411 } else {
412 deve->se_lun = lun;
413 deve->se_lun_acl = lun_acl;
414 deve->mapped_lun = mapped_lun;
415 deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
416 }
417
418 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
419 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
420 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
421 } else {
422 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
423 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
424 }
425
426 if (trans) {
427 spin_unlock_irq(&nacl->device_list_lock);
428 return 0;
429 }
430 deve->creation_time = get_jiffies_64();
431 deve->attach_count++;
432 spin_unlock_irq(&nacl->device_list_lock);
433
434 spin_lock_bh(&port->sep_alua_lock);
435 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
436 spin_unlock_bh(&port->sep_alua_lock);
437
438 return 0;
439 }
440 /*
441 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
442 * PR operation to complete.
443 */
444 spin_unlock_irq(&nacl->device_list_lock);
445 while (atomic_read(&deve->pr_ref_count) != 0)
446 cpu_relax();
447 spin_lock_irq(&nacl->device_list_lock);
448 /*
449 * Disable struct se_dev_entry LUN ACL mapping
450 */
451 core_scsi3_ua_release_all(deve);
452 deve->se_lun = NULL;
453 deve->se_lun_acl = NULL;
454 deve->lun_flags = 0;
455 deve->creation_time = 0;
456 deve->attach_count--;
457 spin_unlock_irq(&nacl->device_list_lock);
458
459 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
460 return 0;
461 }
462
463 /* core_clear_lun_from_tpg():
464 *
465 *
466 */
467 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
468 {
469 struct se_node_acl *nacl;
470 struct se_dev_entry *deve;
471 u32 i;
472
473 spin_lock_irq(&tpg->acl_node_lock);
474 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
475 spin_unlock_irq(&tpg->acl_node_lock);
476
477 spin_lock_irq(&nacl->device_list_lock);
478 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
479 deve = &nacl->device_list[i];
480 if (lun != deve->se_lun)
481 continue;
482 spin_unlock_irq(&nacl->device_list_lock);
483
484 core_update_device_list_for_node(lun, NULL,
485 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
486 nacl, tpg, 0);
487
488 spin_lock_irq(&nacl->device_list_lock);
489 }
490 spin_unlock_irq(&nacl->device_list_lock);
491
492 spin_lock_irq(&tpg->acl_node_lock);
493 }
494 spin_unlock_irq(&tpg->acl_node_lock);
495 }
496
497 static struct se_port *core_alloc_port(struct se_device *dev)
498 {
499 struct se_port *port, *port_tmp;
500
501 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
502 if (!port) {
503 pr_err("Unable to allocate struct se_port\n");
504 return ERR_PTR(-ENOMEM);
505 }
506 INIT_LIST_HEAD(&port->sep_alua_list);
507 INIT_LIST_HEAD(&port->sep_list);
508 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
509 spin_lock_init(&port->sep_alua_lock);
510 mutex_init(&port->sep_tg_pt_md_mutex);
511
512 spin_lock(&dev->se_port_lock);
513 if (dev->dev_port_count == 0x0000ffff) {
514 pr_warn("Reached dev->dev_port_count =="
515 " 0x0000ffff\n");
516 spin_unlock(&dev->se_port_lock);
517 return ERR_PTR(-ENOSPC);
518 }
519 again:
520 /*
521 * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
522 * Here is the table from spc4r17 section 7.7.3.8.
523 *
524 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
525 *
526 * Code Description
527 * 0h Reserved
528 * 1h Relative port 1, historically known as port A
529 * 2h Relative port 2, historically known as port B
530 * 3h to FFFFh Relative port 3 through 65 535
531 */
532 port->sep_rtpi = dev->dev_rpti_counter++;
533 if (!port->sep_rtpi)
534 goto again;
535
536 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
537 /*
538 * Make sure RELATIVE TARGET PORT IDENTIFER is unique
539 * for 16-bit wrap..
540 */
541 if (port->sep_rtpi == port_tmp->sep_rtpi)
542 goto again;
543 }
544 spin_unlock(&dev->se_port_lock);
545
546 return port;
547 }
548
549 static void core_export_port(
550 struct se_device *dev,
551 struct se_portal_group *tpg,
552 struct se_port *port,
553 struct se_lun *lun)
554 {
555 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
556 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
557
558 spin_lock(&dev->se_port_lock);
559 spin_lock(&lun->lun_sep_lock);
560 port->sep_tpg = tpg;
561 port->sep_lun = lun;
562 lun->lun_sep = port;
563 spin_unlock(&lun->lun_sep_lock);
564
565 list_add_tail(&port->sep_list, &dev->dev_sep_list);
566 spin_unlock(&dev->se_port_lock);
567
568 if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
569 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
570 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
571 pr_err("Unable to allocate t10_alua_tg_pt"
572 "_gp_member_t\n");
573 return;
574 }
575 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
576 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
577 su_dev->t10_alua.default_tg_pt_gp);
578 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
579 pr_debug("%s/%s: Adding to default ALUA Target Port"
580 " Group: alua/default_tg_pt_gp\n",
581 dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
582 }
583
584 dev->dev_port_count++;
585 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
586 }
587
588 /*
589 * Called with struct se_device->se_port_lock spinlock held.
590 */
591 static void core_release_port(struct se_device *dev, struct se_port *port)
592 __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
593 {
594 /*
595 * Wait for any port reference for PR ALL_TG_PT=1 operation
596 * to complete in __core_scsi3_alloc_registration()
597 */
598 spin_unlock(&dev->se_port_lock);
599 if (atomic_read(&port->sep_tg_pt_ref_cnt))
600 cpu_relax();
601 spin_lock(&dev->se_port_lock);
602
603 core_alua_free_tg_pt_gp_mem(port);
604
605 list_del(&port->sep_list);
606 dev->dev_port_count--;
607 kfree(port);
608 }
609
610 int core_dev_export(
611 struct se_device *dev,
612 struct se_portal_group *tpg,
613 struct se_lun *lun)
614 {
615 struct se_port *port;
616
617 port = core_alloc_port(dev);
618 if (IS_ERR(port))
619 return PTR_ERR(port);
620
621 lun->lun_se_dev = dev;
622 se_dev_start(dev);
623
624 atomic_inc(&dev->dev_export_obj.obj_access_count);
625 core_export_port(dev, tpg, port, lun);
626 return 0;
627 }
628
629 void core_dev_unexport(
630 struct se_device *dev,
631 struct se_portal_group *tpg,
632 struct se_lun *lun)
633 {
634 struct se_port *port = lun->lun_sep;
635
636 spin_lock(&lun->lun_sep_lock);
637 if (lun->lun_se_dev == NULL) {
638 spin_unlock(&lun->lun_sep_lock);
639 return;
640 }
641 spin_unlock(&lun->lun_sep_lock);
642
643 spin_lock(&dev->se_port_lock);
644 atomic_dec(&dev->dev_export_obj.obj_access_count);
645 core_release_port(dev, port);
646 spin_unlock(&dev->se_port_lock);
647
648 se_dev_stop(dev);
649 lun->lun_se_dev = NULL;
650 }
651
652 int target_report_luns(struct se_task *se_task)
653 {
654 struct se_cmd *se_cmd = se_task->task_se_cmd;
655 struct se_dev_entry *deve;
656 struct se_lun *se_lun;
657 struct se_session *se_sess = se_cmd->se_sess;
658 unsigned char *buf;
659 u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
660
661 buf = transport_kmap_first_data_page(se_cmd);
662
663 /*
664 * If no struct se_session pointer is present, this struct se_cmd is
665 * coming via a target_core_mod PASSTHROUGH op, and not through
666 * a $FABRIC_MOD. In that case, report LUN=0 only.
667 */
668 if (!se_sess) {
669 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
670 lun_count = 1;
671 goto done;
672 }
673
674 spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
675 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
676 deve = &se_sess->se_node_acl->device_list[i];
677 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
678 continue;
679 se_lun = deve->se_lun;
680 /*
681 * We determine the correct LUN LIST LENGTH even once we
682 * have reached the initial allocation length.
683 * See SPC2-R20 7.19.
684 */
685 lun_count++;
686 if ((cdb_offset + 8) >= se_cmd->data_length)
687 continue;
688
689 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
690 offset += 8;
691 cdb_offset += 8;
692 }
693 spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
694
695 /*
696 * See SPC3 r07, page 159.
697 */
698 done:
699 transport_kunmap_first_data_page(se_cmd);
700 lun_count *= 8;
701 buf[0] = ((lun_count >> 24) & 0xff);
702 buf[1] = ((lun_count >> 16) & 0xff);
703 buf[2] = ((lun_count >> 8) & 0xff);
704 buf[3] = (lun_count & 0xff);
705
706 se_task->task_scsi_status = GOOD;
707 transport_complete_task(se_task, 1);
708 return 0;
709 }
710
711 /* se_release_device_for_hba():
712 *
713 *
714 */
715 void se_release_device_for_hba(struct se_device *dev)
716 {
717 struct se_hba *hba = dev->se_hba;
718
719 if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
720 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
721 (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
722 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
723 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
724 se_dev_stop(dev);
725
726 if (dev->dev_ptr) {
727 kthread_stop(dev->process_thread);
728 if (dev->transport->free_device)
729 dev->transport->free_device(dev->dev_ptr);
730 }
731
732 spin_lock(&hba->device_lock);
733 list_del(&dev->dev_list);
734 hba->dev_count--;
735 spin_unlock(&hba->device_lock);
736
737 core_scsi3_free_all_registrations(dev);
738 se_release_vpd_for_dev(dev);
739
740 kfree(dev);
741 }
742
743 void se_release_vpd_for_dev(struct se_device *dev)
744 {
745 struct t10_vpd *vpd, *vpd_tmp;
746
747 spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
748 list_for_each_entry_safe(vpd, vpd_tmp,
749 &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
750 list_del(&vpd->vpd_list);
751 kfree(vpd);
752 }
753 spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
754 }
755
756 /* se_free_virtual_device():
757 *
758 * Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
759 */
760 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
761 {
762 if (!list_empty(&dev->dev_sep_list))
763 dump_stack();
764
765 core_alua_free_lu_gp_mem(dev);
766 se_release_device_for_hba(dev);
767
768 return 0;
769 }
770
771 static void se_dev_start(struct se_device *dev)
772 {
773 struct se_hba *hba = dev->se_hba;
774
775 spin_lock(&hba->device_lock);
776 atomic_inc(&dev->dev_obj.obj_access_count);
777 if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
778 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
779 dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
780 dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
781 } else if (dev->dev_status &
782 TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
783 dev->dev_status &=
784 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
785 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
786 }
787 }
788 spin_unlock(&hba->device_lock);
789 }
790
791 static void se_dev_stop(struct se_device *dev)
792 {
793 struct se_hba *hba = dev->se_hba;
794
795 spin_lock(&hba->device_lock);
796 atomic_dec(&dev->dev_obj.obj_access_count);
797 if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
798 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
799 dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
800 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
801 } else if (dev->dev_status &
802 TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
803 dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
804 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
805 }
806 }
807 spin_unlock(&hba->device_lock);
808 }
809
810 int se_dev_check_online(struct se_device *dev)
811 {
812 unsigned long flags;
813 int ret;
814
815 spin_lock_irqsave(&dev->dev_status_lock, flags);
816 ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
817 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
818 spin_unlock_irqrestore(&dev->dev_status_lock, flags);
819
820 return ret;
821 }
822
823 int se_dev_check_shutdown(struct se_device *dev)
824 {
825 int ret;
826
827 spin_lock_irq(&dev->dev_status_lock);
828 ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
829 spin_unlock_irq(&dev->dev_status_lock);
830
831 return ret;
832 }
833
834 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
835 {
836 u32 tmp, aligned_max_sectors;
837 /*
838 * Limit max_sectors to a PAGE_SIZE aligned value for modern
839 * transport_allocate_data_tasks() operation.
840 */
841 tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
842 aligned_max_sectors = (tmp / block_size);
843 if (max_sectors != aligned_max_sectors) {
844 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
845 " to %u\n", max_sectors, aligned_max_sectors);
846 return aligned_max_sectors;
847 }
848
849 return max_sectors;
850 }
851
852 void se_dev_set_default_attribs(
853 struct se_device *dev,
854 struct se_dev_limits *dev_limits)
855 {
856 struct queue_limits *limits = &dev_limits->limits;
857
858 dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
859 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
860 dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
861 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
862 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
863 dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
864 dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
865 dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
866 dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
867 dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
868 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
869 dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
870 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
871 /*
872 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
873 * iblock_create_virtdevice() from struct queue_limits values
874 * if blk_queue_discard()==1
875 */
876 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
877 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
878 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
879 dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
880 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
881 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
882 /*
883 * block_size is based on subsystem plugin dependent requirements.
884 */
885 dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
886 dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
887 /*
888 * max_sectors is based on subsystem plugin dependent requirements.
889 */
890 dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
891 /*
892 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
893 */
894 limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
895 limits->logical_block_size);
896 dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
897 /*
898 * Set optimal_sectors from max_sectors, which can be lowered via
899 * configfs.
900 */
901 dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
902 /*
903 * queue_depth is based on subsystem plugin dependent requirements.
904 */
905 dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
906 dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
907 }
908
909 int se_dev_set_max_unmap_lba_count(
910 struct se_device *dev,
911 u32 max_unmap_lba_count)
912 {
913 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
914 pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
915 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
916 return 0;
917 }
918
919 int se_dev_set_max_unmap_block_desc_count(
920 struct se_device *dev,
921 u32 max_unmap_block_desc_count)
922 {
923 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
924 max_unmap_block_desc_count;
925 pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
926 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
927 return 0;
928 }
929
930 int se_dev_set_unmap_granularity(
931 struct se_device *dev,
932 u32 unmap_granularity)
933 {
934 dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
935 pr_debug("dev[%p]: Set unmap_granularity: %u\n",
936 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
937 return 0;
938 }
939
940 int se_dev_set_unmap_granularity_alignment(
941 struct se_device *dev,
942 u32 unmap_granularity_alignment)
943 {
944 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
945 pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
946 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
947 return 0;
948 }
949
950 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
951 {
952 if (flag != 0 && flag != 1) {
953 pr_err("Illegal value %d\n", flag);
954 return -EINVAL;
955 }
956
957 if (flag) {
958 pr_err("dpo_emulated not supported\n");
959 return -EINVAL;
960 }
961
962 return 0;
963 }
964
965 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
966 {
967 if (flag != 0 && flag != 1) {
968 pr_err("Illegal value %d\n", flag);
969 return -EINVAL;
970 }
971
972 if (flag && dev->transport->fua_write_emulated == 0) {
973 pr_err("fua_write_emulated not supported\n");
974 return -EINVAL;
975 }
976 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
977 pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
978 dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
979 return 0;
980 }
981
982 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
983 {
984 if (flag != 0 && flag != 1) {
985 pr_err("Illegal value %d\n", flag);
986 return -EINVAL;
987 }
988
989 if (flag) {
990 pr_err("ua read emulated not supported\n");
991 return -EINVAL;
992 }
993
994 return 0;
995 }
996
997 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
998 {
999 if (flag != 0 && flag != 1) {
1000 pr_err("Illegal value %d\n", flag);
1001 return -EINVAL;
1002 }
1003 if (flag && dev->transport->write_cache_emulated == 0) {
1004 pr_err("write_cache_emulated not supported\n");
1005 return -EINVAL;
1006 }
1007 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1008 pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1009 dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1010 return 0;
1011 }
1012
1013 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1014 {
1015 if ((flag != 0) && (flag != 1) && (flag != 2)) {
1016 pr_err("Illegal value %d\n", flag);
1017 return -EINVAL;
1018 }
1019
1020 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1021 pr_err("dev[%p]: Unable to change SE Device"
1022 " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1023 " exists\n", dev,
1024 atomic_read(&dev->dev_export_obj.obj_access_count));
1025 return -EINVAL;
1026 }
1027 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1028 pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1029 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1030
1031 return 0;
1032 }
1033
1034 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1035 {
1036 if ((flag != 0) && (flag != 1)) {
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 TAS while"
1043 " dev_export_obj: %d count exists\n", dev,
1044 atomic_read(&dev->dev_export_obj.obj_access_count));
1045 return -EINVAL;
1046 }
1047 dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1048 pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1049 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1050
1051 return 0;
1052 }
1053
1054 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1055 {
1056 if ((flag != 0) && (flag != 1)) {
1057 pr_err("Illegal value %d\n", flag);
1058 return -EINVAL;
1059 }
1060 /*
1061 * We expect this value to be non-zero when generic Block Layer
1062 * Discard supported is detected iblock_create_virtdevice().
1063 */
1064 if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1065 pr_err("Generic Block Discard not supported\n");
1066 return -ENOSYS;
1067 }
1068
1069 dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1070 pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1071 dev, flag);
1072 return 0;
1073 }
1074
1075 int se_dev_set_emulate_tpws(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_tpws = flag;
1091 pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1092 dev, flag);
1093 return 0;
1094 }
1095
1096 int se_dev_set_enforce_pr_isids(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 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1103 pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1104 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1105 return 0;
1106 }
1107
1108 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1109 {
1110 if ((flag != 0) && (flag != 1)) {
1111 printk(KERN_ERR "Illegal value %d\n", flag);
1112 return -EINVAL;
1113 }
1114 dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1115 pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1116 dev, flag);
1117 return 0;
1118 }
1119
1120 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1121 {
1122 if (flag != 0) {
1123 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1124 " reordering not implemented\n", dev);
1125 return -ENOSYS;
1126 }
1127 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1128 pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1129 return 0;
1130 }
1131
1132 /*
1133 * Note, this can only be called on unexported SE Device Object.
1134 */
1135 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1136 {
1137 u32 orig_queue_depth = dev->queue_depth;
1138
1139 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1140 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1141 " dev_export_obj: %d count exists\n", dev,
1142 atomic_read(&dev->dev_export_obj.obj_access_count));
1143 return -EINVAL;
1144 }
1145 if (!queue_depth) {
1146 pr_err("dev[%p]: Illegal ZERO value for queue"
1147 "_depth\n", dev);
1148 return -EINVAL;
1149 }
1150
1151 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1152 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1153 pr_err("dev[%p]: Passed queue_depth: %u"
1154 " exceeds TCM/SE_Device TCQ: %u\n",
1155 dev, queue_depth,
1156 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1157 return -EINVAL;
1158 }
1159 } else {
1160 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1161 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1162 pr_err("dev[%p]: Passed queue_depth:"
1163 " %u exceeds TCM/SE_Device MAX"
1164 " TCQ: %u\n", dev, queue_depth,
1165 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1166 return -EINVAL;
1167 }
1168 }
1169 }
1170
1171 dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1172 if (queue_depth > orig_queue_depth)
1173 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1174 else if (queue_depth < orig_queue_depth)
1175 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1176
1177 pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1178 dev, queue_depth);
1179 return 0;
1180 }
1181
1182 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1183 {
1184 int force = 0; /* Force setting for VDEVS */
1185
1186 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1187 pr_err("dev[%p]: Unable to change SE Device"
1188 " max_sectors while dev_export_obj: %d count exists\n",
1189 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1190 return -EINVAL;
1191 }
1192 if (!max_sectors) {
1193 pr_err("dev[%p]: Illegal ZERO value for"
1194 " max_sectors\n", dev);
1195 return -EINVAL;
1196 }
1197 if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1198 pr_err("dev[%p]: Passed max_sectors: %u less than"
1199 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1200 DA_STATUS_MAX_SECTORS_MIN);
1201 return -EINVAL;
1202 }
1203 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1204 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1205 pr_err("dev[%p]: Passed max_sectors: %u"
1206 " greater than TCM/SE_Device max_sectors:"
1207 " %u\n", dev, max_sectors,
1208 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1209 return -EINVAL;
1210 }
1211 } else {
1212 if (!force && (max_sectors >
1213 dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1214 pr_err("dev[%p]: Passed max_sectors: %u"
1215 " greater than TCM/SE_Device max_sectors"
1216 ": %u, use force=1 to override.\n", dev,
1217 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1218 return -EINVAL;
1219 }
1220 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1221 pr_err("dev[%p]: Passed max_sectors: %u"
1222 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1223 " %u\n", dev, max_sectors,
1224 DA_STATUS_MAX_SECTORS_MAX);
1225 return -EINVAL;
1226 }
1227 }
1228 /*
1229 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1230 */
1231 max_sectors = se_dev_align_max_sectors(max_sectors,
1232 dev->se_sub_dev->se_dev_attrib.block_size);
1233
1234 dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1235 pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1236 dev, max_sectors);
1237 return 0;
1238 }
1239
1240 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1241 {
1242 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1243 pr_err("dev[%p]: Unable to change SE Device"
1244 " optimal_sectors while dev_export_obj: %d count exists\n",
1245 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1246 return -EINVAL;
1247 }
1248 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1249 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1250 " changed for TCM/pSCSI\n", dev);
1251 return -EINVAL;
1252 }
1253 if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1254 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1255 " greater than max_sectors: %u\n", dev,
1256 optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1257 return -EINVAL;
1258 }
1259
1260 dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1261 pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1262 dev, optimal_sectors);
1263 return 0;
1264 }
1265
1266 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1267 {
1268 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1269 pr_err("dev[%p]: Unable to change SE Device block_size"
1270 " while dev_export_obj: %d count exists\n", dev,
1271 atomic_read(&dev->dev_export_obj.obj_access_count));
1272 return -EINVAL;
1273 }
1274
1275 if ((block_size != 512) &&
1276 (block_size != 1024) &&
1277 (block_size != 2048) &&
1278 (block_size != 4096)) {
1279 pr_err("dev[%p]: Illegal value for block_device: %u"
1280 " for SE device, must be 512, 1024, 2048 or 4096\n",
1281 dev, block_size);
1282 return -EINVAL;
1283 }
1284
1285 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1286 pr_err("dev[%p]: Not allowed to change block_size for"
1287 " Physical Device, use for Linux/SCSI to change"
1288 " block_size for underlying hardware\n", dev);
1289 return -EINVAL;
1290 }
1291
1292 dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1293 pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1294 dev, block_size);
1295 return 0;
1296 }
1297
1298 struct se_lun *core_dev_add_lun(
1299 struct se_portal_group *tpg,
1300 struct se_hba *hba,
1301 struct se_device *dev,
1302 u32 lun)
1303 {
1304 struct se_lun *lun_p;
1305 u32 lun_access = 0;
1306
1307 if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1308 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1309 atomic_read(&dev->dev_access_obj.obj_access_count));
1310 return NULL;
1311 }
1312
1313 lun_p = core_tpg_pre_addlun(tpg, lun);
1314 if ((IS_ERR(lun_p)) || !lun_p)
1315 return NULL;
1316
1317 if (dev->dev_flags & DF_READ_ONLY)
1318 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1319 else
1320 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1321
1322 if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1323 return NULL;
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(), 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 int ret = 0;
1361
1362 lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1363 if (!lun)
1364 return ret;
1365
1366 core_tpg_post_dellun(tpg, lun);
1367
1368 pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1369 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1370 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1371 tpg->se_tpg_tfo->get_fabric_name());
1372
1373 return 0;
1374 }
1375
1376 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1377 {
1378 struct se_lun *lun;
1379
1380 spin_lock(&tpg->tpg_lun_lock);
1381 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1382 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1383 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1384 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1385 TRANSPORT_MAX_LUNS_PER_TPG-1,
1386 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1387 spin_unlock(&tpg->tpg_lun_lock);
1388 return NULL;
1389 }
1390 lun = &tpg->tpg_lun_list[unpacked_lun];
1391
1392 if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1393 pr_err("%s Logical Unit Number: %u is not free on"
1394 " Target Portal Group: %hu, ignoring request.\n",
1395 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1396 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1397 spin_unlock(&tpg->tpg_lun_lock);
1398 return NULL;
1399 }
1400 spin_unlock(&tpg->tpg_lun_lock);
1401
1402 return lun;
1403 }
1404
1405 /* core_dev_get_lun():
1406 *
1407 *
1408 */
1409 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1410 {
1411 struct se_lun *lun;
1412
1413 spin_lock(&tpg->tpg_lun_lock);
1414 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1415 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1416 "_TPG-1: %u for Target Portal Group: %hu\n",
1417 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1418 TRANSPORT_MAX_LUNS_PER_TPG-1,
1419 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1420 spin_unlock(&tpg->tpg_lun_lock);
1421 return NULL;
1422 }
1423 lun = &tpg->tpg_lun_list[unpacked_lun];
1424
1425 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1426 pr_err("%s Logical Unit Number: %u is not active on"
1427 " Target Portal Group: %hu, ignoring request.\n",
1428 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1429 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1430 spin_unlock(&tpg->tpg_lun_lock);
1431 return NULL;
1432 }
1433 spin_unlock(&tpg->tpg_lun_lock);
1434
1435 return lun;
1436 }
1437
1438 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1439 struct se_portal_group *tpg,
1440 u32 mapped_lun,
1441 char *initiatorname,
1442 int *ret)
1443 {
1444 struct se_lun_acl *lacl;
1445 struct se_node_acl *nacl;
1446
1447 if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1448 pr_err("%s InitiatorName exceeds maximum size.\n",
1449 tpg->se_tpg_tfo->get_fabric_name());
1450 *ret = -EOVERFLOW;
1451 return NULL;
1452 }
1453 nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1454 if (!nacl) {
1455 *ret = -EINVAL;
1456 return NULL;
1457 }
1458 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1459 if (!lacl) {
1460 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1461 *ret = -ENOMEM;
1462 return NULL;
1463 }
1464
1465 INIT_LIST_HEAD(&lacl->lacl_list);
1466 lacl->mapped_lun = mapped_lun;
1467 lacl->se_lun_nacl = nacl;
1468 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1469
1470 return lacl;
1471 }
1472
1473 int core_dev_add_initiator_node_lun_acl(
1474 struct se_portal_group *tpg,
1475 struct se_lun_acl *lacl,
1476 u32 unpacked_lun,
1477 u32 lun_access)
1478 {
1479 struct se_lun *lun;
1480 struct se_node_acl *nacl;
1481
1482 lun = core_dev_get_lun(tpg, unpacked_lun);
1483 if (!lun) {
1484 pr_err("%s Logical Unit Number: %u is not active on"
1485 " Target Portal Group: %hu, ignoring request.\n",
1486 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1487 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1488 return -EINVAL;
1489 }
1490
1491 nacl = lacl->se_lun_nacl;
1492 if (!nacl)
1493 return -EINVAL;
1494
1495 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1496 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1497 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1498
1499 lacl->se_lun = lun;
1500
1501 if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1502 lun_access, nacl, tpg, 1) < 0)
1503 return -EINVAL;
1504
1505 spin_lock(&lun->lun_acl_lock);
1506 list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1507 atomic_inc(&lun->lun_acl_count);
1508 smp_mb__after_atomic_inc();
1509 spin_unlock(&lun->lun_acl_lock);
1510
1511 pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1512 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1513 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1514 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1515 lacl->initiatorname);
1516 /*
1517 * Check to see if there are any existing persistent reservation APTPL
1518 * pre-registrations that need to be enabled for this LUN ACL..
1519 */
1520 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1521 return 0;
1522 }
1523
1524 /* core_dev_del_initiator_node_lun_acl():
1525 *
1526 *
1527 */
1528 int core_dev_del_initiator_node_lun_acl(
1529 struct se_portal_group *tpg,
1530 struct se_lun *lun,
1531 struct se_lun_acl *lacl)
1532 {
1533 struct se_node_acl *nacl;
1534
1535 nacl = lacl->se_lun_nacl;
1536 if (!nacl)
1537 return -EINVAL;
1538
1539 spin_lock(&lun->lun_acl_lock);
1540 list_del(&lacl->lacl_list);
1541 atomic_dec(&lun->lun_acl_count);
1542 smp_mb__after_atomic_dec();
1543 spin_unlock(&lun->lun_acl_lock);
1544
1545 core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1546 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1547
1548 lacl->se_lun = NULL;
1549
1550 pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1551 " InitiatorNode: %s Mapped LUN: %u\n",
1552 tpg->se_tpg_tfo->get_fabric_name(),
1553 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1554 lacl->initiatorname, lacl->mapped_lun);
1555
1556 return 0;
1557 }
1558
1559 void core_dev_free_initiator_node_lun_acl(
1560 struct se_portal_group *tpg,
1561 struct se_lun_acl *lacl)
1562 {
1563 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1564 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1565 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1566 tpg->se_tpg_tfo->get_fabric_name(),
1567 lacl->initiatorname, lacl->mapped_lun);
1568
1569 kfree(lacl);
1570 }
1571
1572 int core_dev_setup_virtual_lun0(void)
1573 {
1574 struct se_hba *hba;
1575 struct se_device *dev;
1576 struct se_subsystem_dev *se_dev = NULL;
1577 struct se_subsystem_api *t;
1578 char buf[16];
1579 int ret;
1580
1581 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1582 if (IS_ERR(hba))
1583 return PTR_ERR(hba);
1584
1585 lun0_hba = hba;
1586 t = hba->transport;
1587
1588 se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1589 if (!se_dev) {
1590 pr_err("Unable to allocate memory for"
1591 " struct se_subsystem_dev\n");
1592 ret = -ENOMEM;
1593 goto out;
1594 }
1595 INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1596 spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1597 INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1598 INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1599 spin_lock_init(&se_dev->t10_pr.registration_lock);
1600 spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1601 INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1602 spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1603 spin_lock_init(&se_dev->se_dev_lock);
1604 se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1605 se_dev->t10_wwn.t10_sub_dev = se_dev;
1606 se_dev->t10_alua.t10_sub_dev = se_dev;
1607 se_dev->se_dev_attrib.da_sub_dev = se_dev;
1608 se_dev->se_dev_hba = hba;
1609
1610 se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1611 if (!se_dev->se_dev_su_ptr) {
1612 pr_err("Unable to locate subsystem dependent pointer"
1613 " from allocate_virtdevice()\n");
1614 ret = -ENOMEM;
1615 goto out;
1616 }
1617 lun0_su_dev = se_dev;
1618
1619 memset(buf, 0, 16);
1620 sprintf(buf, "rd_pages=8");
1621 t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1622
1623 dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1624 if (IS_ERR(dev)) {
1625 ret = PTR_ERR(dev);
1626 goto out;
1627 }
1628 se_dev->se_dev_ptr = dev;
1629 g_lun0_dev = dev;
1630
1631 return 0;
1632 out:
1633 lun0_su_dev = NULL;
1634 kfree(se_dev);
1635 if (lun0_hba) {
1636 core_delete_hba(lun0_hba);
1637 lun0_hba = NULL;
1638 }
1639 return ret;
1640 }
1641
1642
1643 void core_dev_release_virtual_lun0(void)
1644 {
1645 struct se_hba *hba = lun0_hba;
1646 struct se_subsystem_dev *su_dev = lun0_su_dev;
1647
1648 if (!hba)
1649 return;
1650
1651 if (g_lun0_dev)
1652 se_free_virtual_device(g_lun0_dev, hba);
1653
1654 kfree(su_dev);
1655 core_delete_hba(hba);
1656 }
Linux kernel - Deliverables
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