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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / drivers / target / target_core_device.c
blob4cee1138284be93c1eeee84a7b1adb8ca6103fce
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * Filename: target_core_device.c (based on iscsi_target_device.c)
4 *
5 * This file contains the TCM Virtual Device and Disk Transport
6 * agnostic related functions.
7 *
8 * (c) Copyright 2003-2013 Datera, Inc.
9 *
10 * Nicholas A. Bellinger <nab@kernel.org>
11 *
12 ******************************************************************************/
13
14 #include <linux/net.h>
15 #include <linux/string.h>
16 #include <linux/delay.h>
17 #include <linux/timer.h>
18 #include <linux/slab.h>
19 #include <linux/spinlock.h>
20 #include <linux/kthread.h>
21 #include <linux/in.h>
22 #include <linux/export.h>
23 #include <linux/t10-pi.h>
24 #include <asm/unaligned.h>
25 #include <net/sock.h>
26 #include <net/tcp.h>
27 #include <scsi/scsi_common.h>
28 #include <scsi/scsi_proto.h>
29
30 #include <target/target_core_base.h>
31 #include <target/target_core_backend.h>
32 #include <target/target_core_fabric.h>
33
34 #include "target_core_internal.h"
35 #include "target_core_alua.h"
36 #include "target_core_pr.h"
37 #include "target_core_ua.h"
38
39 static DEFINE_MUTEX(device_mutex);
40 static LIST_HEAD(device_list);
41 static DEFINE_IDR(devices_idr);
42
43 static struct se_hba *lun0_hba;
44 /* not static, needed by tpg.c */
45 struct se_device *g_lun0_dev;
46
47 sense_reason_t
48 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
49 {
50 struct se_lun *se_lun = NULL;
51 struct se_session *se_sess = se_cmd->se_sess;
52 struct se_node_acl *nacl = se_sess->se_node_acl;
53 struct se_dev_entry *deve;
54 sense_reason_t ret = TCM_NO_SENSE;
55
56 rcu_read_lock();
57 deve = target_nacl_find_deve(nacl, unpacked_lun);
58 if (deve) {
59 atomic_long_inc(&deve->total_cmds);
60
61 if (se_cmd->data_direction == DMA_TO_DEVICE)
62 atomic_long_add(se_cmd->data_length,
63 &deve->write_bytes);
64 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
65 atomic_long_add(se_cmd->data_length,
66 &deve->read_bytes);
67
68 se_lun = rcu_dereference(deve->se_lun);
69
70 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
71 se_lun = NULL;
72 goto out_unlock;
73 }
74
75 se_cmd->se_lun = se_lun;
76 se_cmd->pr_res_key = deve->pr_res_key;
77 se_cmd->orig_fe_lun = unpacked_lun;
78 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
79 se_cmd->lun_ref_active = true;
80
81 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
82 deve->lun_access_ro) {
83 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
84 " Access for 0x%08llx\n",
85 se_cmd->se_tfo->fabric_name,
86 unpacked_lun);
87 rcu_read_unlock();
88 ret = TCM_WRITE_PROTECTED;
89 goto ref_dev;
90 }
91 }
92 out_unlock:
93 rcu_read_unlock();
94
95 if (!se_lun) {
96 /*
97 * Use the se_portal_group->tpg_virt_lun0 to allow for
98 * REPORT_LUNS, et al to be returned when no active
99 * MappedLUN=0 exists for this Initiator Port.
100 */
101 if (unpacked_lun != 0) {
102 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
103 " Access for 0x%08llx\n",
104 se_cmd->se_tfo->fabric_name,
105 unpacked_lun);
106 return TCM_NON_EXISTENT_LUN;
107 }
108
109 se_lun = se_sess->se_tpg->tpg_virt_lun0;
110 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
111 se_cmd->orig_fe_lun = 0;
112 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
113
114 percpu_ref_get(&se_lun->lun_ref);
115 se_cmd->lun_ref_active = true;
116
117 /*
118 * Force WRITE PROTECT for virtual LUN 0
119 */
120 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
121 (se_cmd->data_direction != DMA_NONE)) {
122 ret = TCM_WRITE_PROTECTED;
123 goto ref_dev;
124 }
125 }
126 /*
127 * RCU reference protected by percpu se_lun->lun_ref taken above that
128 * must drop to zero (including initial reference) before this se_lun
129 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
130 * target_core_fabric_configfs.c:target_fabric_port_release
131 */
132 ref_dev:
133 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
134 atomic_long_inc(&se_cmd->se_dev->num_cmds);
135
136 if (se_cmd->data_direction == DMA_TO_DEVICE)
137 atomic_long_add(se_cmd->data_length,
138 &se_cmd->se_dev->write_bytes);
139 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
140 atomic_long_add(se_cmd->data_length,
141 &se_cmd->se_dev->read_bytes);
142
143 return ret;
144 }
145 EXPORT_SYMBOL(transport_lookup_cmd_lun);
146
147 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
148 {
149 struct se_dev_entry *deve;
150 struct se_lun *se_lun = NULL;
151 struct se_session *se_sess = se_cmd->se_sess;
152 struct se_node_acl *nacl = se_sess->se_node_acl;
153 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
154 unsigned long flags;
155
156 rcu_read_lock();
157 deve = target_nacl_find_deve(nacl, unpacked_lun);
158 if (deve) {
159 se_lun = rcu_dereference(deve->se_lun);
160
161 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
162 se_lun = NULL;
163 goto out_unlock;
164 }
165
166 se_cmd->se_lun = se_lun;
167 se_cmd->pr_res_key = deve->pr_res_key;
168 se_cmd->orig_fe_lun = unpacked_lun;
169 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
170 se_cmd->lun_ref_active = true;
171 }
172 out_unlock:
173 rcu_read_unlock();
174
175 if (!se_lun) {
176 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
177 " Access for 0x%08llx\n",
178 se_cmd->se_tfo->fabric_name,
179 unpacked_lun);
180 return -ENODEV;
181 }
182 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
183 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
184
185 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
186 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
187 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
188
189 return 0;
190 }
191 EXPORT_SYMBOL(transport_lookup_tmr_lun);
192
193 bool target_lun_is_rdonly(struct se_cmd *cmd)
194 {
195 struct se_session *se_sess = cmd->se_sess;
196 struct se_dev_entry *deve;
197 bool ret;
198
199 rcu_read_lock();
200 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
201 ret = deve && deve->lun_access_ro;
202 rcu_read_unlock();
203
204 return ret;
205 }
206 EXPORT_SYMBOL(target_lun_is_rdonly);
207
208 /*
209 * This function is called from core_scsi3_emulate_pro_register_and_move()
210 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
211 * when a matching rtpi is found.
212 */
213 struct se_dev_entry *core_get_se_deve_from_rtpi(
214 struct se_node_acl *nacl,
215 u16 rtpi)
216 {
217 struct se_dev_entry *deve;
218 struct se_lun *lun;
219 struct se_portal_group *tpg = nacl->se_tpg;
220
221 rcu_read_lock();
222 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
223 lun = rcu_dereference(deve->se_lun);
224 if (!lun) {
225 pr_err("%s device entries device pointer is"
226 " NULL, but Initiator has access.\n",
227 tpg->se_tpg_tfo->fabric_name);
228 continue;
229 }
230 if (lun->lun_rtpi != rtpi)
231 continue;
232
233 kref_get(&deve->pr_kref);
234 rcu_read_unlock();
235
236 return deve;
237 }
238 rcu_read_unlock();
239
240 return NULL;
241 }
242
243 void core_free_device_list_for_node(
244 struct se_node_acl *nacl,
245 struct se_portal_group *tpg)
246 {
247 struct se_dev_entry *deve;
248
249 mutex_lock(&nacl->lun_entry_mutex);
250 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
251 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
252 lockdep_is_held(&nacl->lun_entry_mutex));
253 core_disable_device_list_for_node(lun, deve, nacl, tpg);
254 }
255 mutex_unlock(&nacl->lun_entry_mutex);
256 }
257
258 void core_update_device_list_access(
259 u64 mapped_lun,
260 bool lun_access_ro,
261 struct se_node_acl *nacl)
262 {
263 struct se_dev_entry *deve;
264
265 mutex_lock(&nacl->lun_entry_mutex);
266 deve = target_nacl_find_deve(nacl, mapped_lun);
267 if (deve)
268 deve->lun_access_ro = lun_access_ro;
269 mutex_unlock(&nacl->lun_entry_mutex);
270 }
271
272 /*
273 * Called with rcu_read_lock or nacl->device_list_lock held.
274 */
275 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
276 {
277 struct se_dev_entry *deve;
278
279 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
280 if (deve->mapped_lun == mapped_lun)
281 return deve;
282
283 return NULL;
284 }
285 EXPORT_SYMBOL(target_nacl_find_deve);
286
287 void target_pr_kref_release(struct kref *kref)
288 {
289 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
290 pr_kref);
291 complete(&deve->pr_comp);
292 }
293
294 static void
295 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
296 bool skip_new)
297 {
298 struct se_dev_entry *tmp;
299
300 rcu_read_lock();
301 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
302 if (skip_new && tmp == new)
303 continue;
304 core_scsi3_ua_allocate(tmp, 0x3F,
305 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
306 }
307 rcu_read_unlock();
308 }
309
310 int core_enable_device_list_for_node(
311 struct se_lun *lun,
312 struct se_lun_acl *lun_acl,
313 u64 mapped_lun,
314 bool lun_access_ro,
315 struct se_node_acl *nacl,
316 struct se_portal_group *tpg)
317 {
318 struct se_dev_entry *orig, *new;
319
320 new = kzalloc(sizeof(*new), GFP_KERNEL);
321 if (!new) {
322 pr_err("Unable to allocate se_dev_entry memory\n");
323 return -ENOMEM;
324 }
325
326 spin_lock_init(&new->ua_lock);
327 INIT_LIST_HEAD(&new->ua_list);
328 INIT_LIST_HEAD(&new->lun_link);
329
330 new->mapped_lun = mapped_lun;
331 kref_init(&new->pr_kref);
332 init_completion(&new->pr_comp);
333
334 new->lun_access_ro = lun_access_ro;
335 new->creation_time = get_jiffies_64();
336 new->attach_count++;
337
338 mutex_lock(&nacl->lun_entry_mutex);
339 orig = target_nacl_find_deve(nacl, mapped_lun);
340 if (orig && orig->se_lun) {
341 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
342 lockdep_is_held(&nacl->lun_entry_mutex));
343
344 if (orig_lun != lun) {
345 pr_err("Existing orig->se_lun doesn't match new lun"
346 " for dynamic -> explicit NodeACL conversion:"
347 " %s\n", nacl->initiatorname);
348 mutex_unlock(&nacl->lun_entry_mutex);
349 kfree(new);
350 return -EINVAL;
351 }
352 if (orig->se_lun_acl != NULL) {
353 pr_warn_ratelimited("Detected existing explicit"
354 " se_lun_acl->se_lun_group reference for %s"
355 " mapped_lun: %llu, failing\n",
356 nacl->initiatorname, mapped_lun);
357 mutex_unlock(&nacl->lun_entry_mutex);
358 kfree(new);
359 return -EINVAL;
360 }
361
362 rcu_assign_pointer(new->se_lun, lun);
363 rcu_assign_pointer(new->se_lun_acl, lun_acl);
364 hlist_del_rcu(&orig->link);
365 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
366 mutex_unlock(&nacl->lun_entry_mutex);
367
368 spin_lock(&lun->lun_deve_lock);
369 list_del(&orig->lun_link);
370 list_add_tail(&new->lun_link, &lun->lun_deve_list);
371 spin_unlock(&lun->lun_deve_lock);
372
373 kref_put(&orig->pr_kref, target_pr_kref_release);
374 wait_for_completion(&orig->pr_comp);
375
376 target_luns_data_has_changed(nacl, new, true);
377 kfree_rcu(orig, rcu_head);
378 return 0;
379 }
380
381 rcu_assign_pointer(new->se_lun, lun);
382 rcu_assign_pointer(new->se_lun_acl, lun_acl);
383 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
384 mutex_unlock(&nacl->lun_entry_mutex);
385
386 spin_lock(&lun->lun_deve_lock);
387 list_add_tail(&new->lun_link, &lun->lun_deve_list);
388 spin_unlock(&lun->lun_deve_lock);
389
390 target_luns_data_has_changed(nacl, new, true);
391 return 0;
392 }
393
394 void core_disable_device_list_for_node(
395 struct se_lun *lun,
396 struct se_dev_entry *orig,
397 struct se_node_acl *nacl,
398 struct se_portal_group *tpg)
399 {
400 /*
401 * rcu_dereference_raw protected by se_lun->lun_group symlink
402 * reference to se_device->dev_group.
403 */
404 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
405
406 lockdep_assert_held(&nacl->lun_entry_mutex);
407
408 /*
409 * If the MappedLUN entry is being disabled, the entry in
410 * lun->lun_deve_list must be removed now before clearing the
411 * struct se_dev_entry pointers below as logic in
412 * core_alua_do_transition_tg_pt() depends on these being present.
413 *
414 * deve->se_lun_acl will be NULL for demo-mode created LUNs
415 * that have not been explicitly converted to MappedLUNs ->
416 * struct se_lun_acl, but we remove deve->lun_link from
417 * lun->lun_deve_list. This also means that active UAs and
418 * NodeACL context specific PR metadata for demo-mode
419 * MappedLUN *deve will be released below..
420 */
421 spin_lock(&lun->lun_deve_lock);
422 list_del(&orig->lun_link);
423 spin_unlock(&lun->lun_deve_lock);
424 /*
425 * Disable struct se_dev_entry LUN ACL mapping
426 */
427 core_scsi3_ua_release_all(orig);
428
429 hlist_del_rcu(&orig->link);
430 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
431 orig->lun_access_ro = false;
432 orig->creation_time = 0;
433 orig->attach_count--;
434 /*
435 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
436 * or REGISTER_AND_MOVE PR operation to complete.
437 */
438 kref_put(&orig->pr_kref, target_pr_kref_release);
439 wait_for_completion(&orig->pr_comp);
440
441 rcu_assign_pointer(orig->se_lun, NULL);
442 rcu_assign_pointer(orig->se_lun_acl, NULL);
443
444 kfree_rcu(orig, rcu_head);
445
446 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
447 target_luns_data_has_changed(nacl, NULL, false);
448 }
449
450 /* core_clear_lun_from_tpg():
451 *
452 *
453 */
454 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
455 {
456 struct se_node_acl *nacl;
457 struct se_dev_entry *deve;
458
459 mutex_lock(&tpg->acl_node_mutex);
460 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
461
462 mutex_lock(&nacl->lun_entry_mutex);
463 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
464 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
465 lockdep_is_held(&nacl->lun_entry_mutex));
466
467 if (lun != tmp_lun)
468 continue;
469
470 core_disable_device_list_for_node(lun, deve, nacl, tpg);
471 }
472 mutex_unlock(&nacl->lun_entry_mutex);
473 }
474 mutex_unlock(&tpg->acl_node_mutex);
475 }
476
477 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
478 {
479 struct se_lun *tmp;
480
481 spin_lock(&dev->se_port_lock);
482 if (dev->export_count == 0x0000ffff) {
483 pr_warn("Reached dev->dev_port_count =="
484 " 0x0000ffff\n");
485 spin_unlock(&dev->se_port_lock);
486 return -ENOSPC;
487 }
488 again:
489 /*
490 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
491 * Here is the table from spc4r17 section 7.7.3.8.
492 *
493 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
494 *
495 * Code Description
496 * 0h Reserved
497 * 1h Relative port 1, historically known as port A
498 * 2h Relative port 2, historically known as port B
499 * 3h to FFFFh Relative port 3 through 65 535
500 */
501 lun->lun_rtpi = dev->dev_rpti_counter++;
502 if (!lun->lun_rtpi)
503 goto again;
504
505 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
506 /*
507 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
508 * for 16-bit wrap..
509 */
510 if (lun->lun_rtpi == tmp->lun_rtpi)
511 goto again;
512 }
513 spin_unlock(&dev->se_port_lock);
514
515 return 0;
516 }
517
518 static void se_release_vpd_for_dev(struct se_device *dev)
519 {
520 struct t10_vpd *vpd, *vpd_tmp;
521
522 spin_lock(&dev->t10_wwn.t10_vpd_lock);
523 list_for_each_entry_safe(vpd, vpd_tmp,
524 &dev->t10_wwn.t10_vpd_list, vpd_list) {
525 list_del(&vpd->vpd_list);
526 kfree(vpd);
527 }
528 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
529 }
530
531 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
532 {
533 u32 aligned_max_sectors;
534 u32 alignment;
535 /*
536 * Limit max_sectors to a PAGE_SIZE aligned value for modern
537 * transport_allocate_data_tasks() operation.
538 */
539 alignment = max(1ul, PAGE_SIZE / block_size);
540 aligned_max_sectors = rounddown(max_sectors, alignment);
541
542 if (max_sectors != aligned_max_sectors)
543 pr_info("Rounding down aligned max_sectors from %u to %u\n",
544 max_sectors, aligned_max_sectors);
545
546 return aligned_max_sectors;
547 }
548
549 int core_dev_add_lun(
550 struct se_portal_group *tpg,
551 struct se_device *dev,
552 struct se_lun *lun)
553 {
554 int rc;
555
556 rc = core_tpg_add_lun(tpg, lun, false, dev);
557 if (rc < 0)
558 return rc;
559
560 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
561 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
562 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
563 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
564 /*
565 * Update LUN maps for dynamically added initiators when
566 * generate_node_acl is enabled.
567 */
568 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
569 struct se_node_acl *acl;
570
571 mutex_lock(&tpg->acl_node_mutex);
572 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
573 if (acl->dynamic_node_acl &&
574 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
575 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
576 core_tpg_add_node_to_devs(acl, tpg, lun);
577 }
578 }
579 mutex_unlock(&tpg->acl_node_mutex);
580 }
581
582 return 0;
583 }
584
585 /* core_dev_del_lun():
586 *
587 *
588 */
589 void core_dev_del_lun(
590 struct se_portal_group *tpg,
591 struct se_lun *lun)
592 {
593 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
594 " device object\n", tpg->se_tpg_tfo->fabric_name,
595 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
596 tpg->se_tpg_tfo->fabric_name);
597
598 core_tpg_remove_lun(tpg, lun);
599 }
600
601 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
602 struct se_portal_group *tpg,
603 struct se_node_acl *nacl,
604 u64 mapped_lun,
605 int *ret)
606 {
607 struct se_lun_acl *lacl;
608
609 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
610 pr_err("%s InitiatorName exceeds maximum size.\n",
611 tpg->se_tpg_tfo->fabric_name);
612 *ret = -EOVERFLOW;
613 return NULL;
614 }
615 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
616 if (!lacl) {
617 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
618 *ret = -ENOMEM;
619 return NULL;
620 }
621
622 lacl->mapped_lun = mapped_lun;
623 lacl->se_lun_nacl = nacl;
624
625 return lacl;
626 }
627
628 int core_dev_add_initiator_node_lun_acl(
629 struct se_portal_group *tpg,
630 struct se_lun_acl *lacl,
631 struct se_lun *lun,
632 bool lun_access_ro)
633 {
634 struct se_node_acl *nacl = lacl->se_lun_nacl;
635 /*
636 * rcu_dereference_raw protected by se_lun->lun_group symlink
637 * reference to se_device->dev_group.
638 */
639 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
640
641 if (!nacl)
642 return -EINVAL;
643
644 if (lun->lun_access_ro)
645 lun_access_ro = true;
646
647 lacl->se_lun = lun;
648
649 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
650 lun_access_ro, nacl, tpg) < 0)
651 return -EINVAL;
652
653 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
654 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
655 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
656 lun_access_ro ? "RO" : "RW",
657 nacl->initiatorname);
658 /*
659 * Check to see if there are any existing persistent reservation APTPL
660 * pre-registrations that need to be enabled for this LUN ACL..
661 */
662 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
663 lacl->mapped_lun);
664 return 0;
665 }
666
667 int core_dev_del_initiator_node_lun_acl(
668 struct se_lun *lun,
669 struct se_lun_acl *lacl)
670 {
671 struct se_portal_group *tpg = lun->lun_tpg;
672 struct se_node_acl *nacl;
673 struct se_dev_entry *deve;
674
675 nacl = lacl->se_lun_nacl;
676 if (!nacl)
677 return -EINVAL;
678
679 mutex_lock(&nacl->lun_entry_mutex);
680 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
681 if (deve)
682 core_disable_device_list_for_node(lun, deve, nacl, tpg);
683 mutex_unlock(&nacl->lun_entry_mutex);
684
685 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
686 " InitiatorNode: %s Mapped LUN: %llu\n",
687 tpg->se_tpg_tfo->fabric_name,
688 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
689 nacl->initiatorname, lacl->mapped_lun);
690
691 return 0;
692 }
693
694 void core_dev_free_initiator_node_lun_acl(
695 struct se_portal_group *tpg,
696 struct se_lun_acl *lacl)
697 {
698 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
699 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
700 tpg->se_tpg_tfo->tpg_get_tag(tpg),
701 tpg->se_tpg_tfo->fabric_name,
702 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
703
704 kfree(lacl);
705 }
706
707 static void scsi_dump_inquiry(struct se_device *dev)
708 {
709 struct t10_wwn *wwn = &dev->t10_wwn;
710 int device_type = dev->transport->get_device_type(dev);
711
712 /*
713 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
714 */
715 pr_debug(" Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
716 wwn->vendor);
717 pr_debug(" Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
718 wwn->model);
719 pr_debug(" Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
720 wwn->revision);
721 pr_debug(" Type: %s ", scsi_device_type(device_type));
722 }
723
724 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
725 {
726 struct se_device *dev;
727 struct se_lun *xcopy_lun;
728
729 dev = hba->backend->ops->alloc_device(hba, name);
730 if (!dev)
731 return NULL;
732
733 dev->se_hba = hba;
734 dev->transport = hba->backend->ops;
735 dev->prot_length = sizeof(struct t10_pi_tuple);
736 dev->hba_index = hba->hba_index;
737
738 INIT_LIST_HEAD(&dev->dev_sep_list);
739 INIT_LIST_HEAD(&dev->dev_tmr_list);
740 INIT_LIST_HEAD(&dev->delayed_cmd_list);
741 INIT_LIST_HEAD(&dev->state_list);
742 INIT_LIST_HEAD(&dev->qf_cmd_list);
743 spin_lock_init(&dev->execute_task_lock);
744 spin_lock_init(&dev->delayed_cmd_lock);
745 spin_lock_init(&dev->dev_reservation_lock);
746 spin_lock_init(&dev->se_port_lock);
747 spin_lock_init(&dev->se_tmr_lock);
748 spin_lock_init(&dev->qf_cmd_lock);
749 sema_init(&dev->caw_sem, 1);
750 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
751 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
752 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
753 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
754 spin_lock_init(&dev->t10_pr.registration_lock);
755 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
756 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
757 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
758 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
759 spin_lock_init(&dev->t10_alua.lba_map_lock);
760
761 dev->t10_wwn.t10_dev = dev;
762 dev->t10_alua.t10_dev = dev;
763
764 dev->dev_attrib.da_dev = dev;
765 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
766 dev->dev_attrib.emulate_dpo = 1;
767 dev->dev_attrib.emulate_fua_write = 1;
768 dev->dev_attrib.emulate_fua_read = 1;
769 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
770 dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
771 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
772 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
773 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
774 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
775 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
776 dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
777 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
778 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
779 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
780 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
781 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
782 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
783 dev->dev_attrib.max_unmap_block_desc_count =
784 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
785 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
786 dev->dev_attrib.unmap_granularity_alignment =
787 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
788 dev->dev_attrib.unmap_zeroes_data =
789 DA_UNMAP_ZEROES_DATA_DEFAULT;
790 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
791
792 xcopy_lun = &dev->xcopy_lun;
793 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
794 init_completion(&xcopy_lun->lun_shutdown_comp);
795 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
796 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
797 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
798 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
799
800 /* Preload the default INQUIRY const values */
801 strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
802 strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
803 sizeof(dev->t10_wwn.model));
804 strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
805 sizeof(dev->t10_wwn.revision));
806
807 return dev;
808 }
809
810 /*
811 * Check if the underlying struct block_device request_queue supports
812 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
813 * in ATA and we need to set TPE=1
814 */
815 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
816 struct request_queue *q)
817 {
818 int block_size = queue_logical_block_size(q);
819
820 if (!blk_queue_discard(q))
821 return false;
822
823 attrib->max_unmap_lba_count =
824 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
825 /*
826 * Currently hardcoded to 1 in Linux/SCSI code..
827 */
828 attrib->max_unmap_block_desc_count = 1;
829 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
830 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
831 block_size;
832 attrib->unmap_zeroes_data = !!(q->limits.max_write_zeroes_sectors);
833 return true;
834 }
835 EXPORT_SYMBOL(target_configure_unmap_from_queue);
836
837 /*
838 * Convert from blocksize advertised to the initiator to the 512 byte
839 * units unconditionally used by the Linux block layer.
840 */
841 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
842 {
843 switch (dev->dev_attrib.block_size) {
844 case 4096:
845 return lb << 3;
846 case 2048:
847 return lb << 2;
848 case 1024:
849 return lb << 1;
850 default:
851 return lb;
852 }
853 }
854 EXPORT_SYMBOL(target_to_linux_sector);
855
856 struct devices_idr_iter {
857 struct config_item *prev_item;
858 int (*fn)(struct se_device *dev, void *data);
859 void *data;
860 };
861
862 static int target_devices_idr_iter(int id, void *p, void *data)
863 __must_hold(&device_mutex)
864 {
865 struct devices_idr_iter *iter = data;
866 struct se_device *dev = p;
867 int ret;
868
869 config_item_put(iter->prev_item);
870 iter->prev_item = NULL;
871
872 /*
873 * We add the device early to the idr, so it can be used
874 * by backend modules during configuration. We do not want
875 * to allow other callers to access partially setup devices,
876 * so we skip them here.
877 */
878 if (!target_dev_configured(dev))
879 return 0;
880
881 iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
882 if (!iter->prev_item)
883 return 0;
884 mutex_unlock(&device_mutex);
885
886 ret = iter->fn(dev, iter->data);
887
888 mutex_lock(&device_mutex);
889 return ret;
890 }
891
892 /**
893 * target_for_each_device - iterate over configured devices
894 * @fn: iterator function
895 * @data: pointer to data that will be passed to fn
896 *
897 * fn must return 0 to continue looping over devices. non-zero will break
898 * from the loop and return that value to the caller.
899 */
900 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
901 void *data)
902 {
903 struct devices_idr_iter iter = { .fn = fn, .data = data };
904 int ret;
905
906 mutex_lock(&device_mutex);
907 ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
908 mutex_unlock(&device_mutex);
909 config_item_put(iter.prev_item);
910 return ret;
911 }
912
913 int target_configure_device(struct se_device *dev)
914 {
915 struct se_hba *hba = dev->se_hba;
916 int ret, id;
917
918 if (target_dev_configured(dev)) {
919 pr_err("se_dev->se_dev_ptr already set for storage"
920 " object\n");
921 return -EEXIST;
922 }
923
924 /*
925 * Add early so modules like tcmu can use during its
926 * configuration.
927 */
928 mutex_lock(&device_mutex);
929 /*
930 * Use cyclic to try and avoid collisions with devices
931 * that were recently removed.
932 */
933 id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
934 mutex_unlock(&device_mutex);
935 if (id < 0) {
936 ret = -ENOMEM;
937 goto out;
938 }
939 dev->dev_index = id;
940
941 ret = dev->transport->configure_device(dev);
942 if (ret)
943 goto out_free_index;
944 /*
945 * XXX: there is not much point to have two different values here..
946 */
947 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
948 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
949
950 /*
951 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
952 */
953 dev->dev_attrib.hw_max_sectors =
954 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
955 dev->dev_attrib.hw_block_size);
956 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
957
958 dev->creation_time = get_jiffies_64();
959
960 ret = core_setup_alua(dev);
961 if (ret)
962 goto out_destroy_device;
963
964 /*
965 * Setup work_queue for QUEUE_FULL
966 */
967 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
968
969 scsi_dump_inquiry(dev);
970
971 spin_lock(&hba->device_lock);
972 hba->dev_count++;
973 spin_unlock(&hba->device_lock);
974
975 dev->dev_flags |= DF_CONFIGURED;
976
977 return 0;
978
979 out_destroy_device:
980 dev->transport->destroy_device(dev);
981 out_free_index:
982 mutex_lock(&device_mutex);
983 idr_remove(&devices_idr, dev->dev_index);
984 mutex_unlock(&device_mutex);
985 out:
986 se_release_vpd_for_dev(dev);
987 return ret;
988 }
989
990 void target_free_device(struct se_device *dev)
991 {
992 struct se_hba *hba = dev->se_hba;
993
994 WARN_ON(!list_empty(&dev->dev_sep_list));
995
996 if (target_dev_configured(dev)) {
997 dev->transport->destroy_device(dev);
998
999 mutex_lock(&device_mutex);
1000 idr_remove(&devices_idr, dev->dev_index);
1001 mutex_unlock(&device_mutex);
1002
1003 spin_lock(&hba->device_lock);
1004 hba->dev_count--;
1005 spin_unlock(&hba->device_lock);
1006 }
1007
1008 core_alua_free_lu_gp_mem(dev);
1009 core_alua_set_lba_map(dev, NULL, 0, 0);
1010 core_scsi3_free_all_registrations(dev);
1011 se_release_vpd_for_dev(dev);
1012
1013 if (dev->transport->free_prot)
1014 dev->transport->free_prot(dev);
1015
1016 dev->transport->free_device(dev);
1017 }
1018
1019 int core_dev_setup_virtual_lun0(void)
1020 {
1021 struct se_hba *hba;
1022 struct se_device *dev;
1023 char buf[] = "rd_pages=8,rd_nullio=1";
1024 int ret;
1025
1026 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1027 if (IS_ERR(hba))
1028 return PTR_ERR(hba);
1029
1030 dev = target_alloc_device(hba, "virt_lun0");
1031 if (!dev) {
1032 ret = -ENOMEM;
1033 goto out_free_hba;
1034 }
1035
1036 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1037
1038 ret = target_configure_device(dev);
1039 if (ret)
1040 goto out_free_se_dev;
1041
1042 lun0_hba = hba;
1043 g_lun0_dev = dev;
1044 return 0;
1045
1046 out_free_se_dev:
1047 target_free_device(dev);
1048 out_free_hba:
1049 core_delete_hba(hba);
1050 return ret;
1051 }
1052
1053
1054 void core_dev_release_virtual_lun0(void)
1055 {
1056 struct se_hba *hba = lun0_hba;
1057
1058 if (!hba)
1059 return;
1060
1061 if (g_lun0_dev)
1062 target_free_device(g_lun0_dev);
1063 core_delete_hba(hba);
1064 }
1065
1066 /*
1067 * Common CDB parsing for kernel and user passthrough.
1068 */
1069 sense_reason_t
1070 passthrough_parse_cdb(struct se_cmd *cmd,
1071 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1072 {
1073 unsigned char *cdb = cmd->t_task_cdb;
1074 struct se_device *dev = cmd->se_dev;
1075 unsigned int size;
1076
1077 /*
1078 * For REPORT LUNS we always need to emulate the response, for everything
1079 * else, pass it up.
1080 */
1081 if (cdb[0] == REPORT_LUNS) {
1082 cmd->execute_cmd = spc_emulate_report_luns;
1083 return TCM_NO_SENSE;
1084 }
1085
1086 /*
1087 * With emulate_pr disabled, all reservation requests should fail,
1088 * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1089 */
1090 if (!dev->dev_attrib.emulate_pr &&
1091 ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1092 (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1093 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1094 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1095 return TCM_UNSUPPORTED_SCSI_OPCODE;
1096 }
1097
1098 /*
1099 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1100 * emulate the response, since tcmu does not have the information
1101 * required to process these commands.
1102 */
1103 if (!(dev->transport->transport_flags &
1104 TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1105 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1106 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1107 size = get_unaligned_be16(&cdb[7]);
1108 return target_cmd_size_check(cmd, size);
1109 }
1110 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1111 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1112 size = get_unaligned_be32(&cdb[5]);
1113 return target_cmd_size_check(cmd, size);
1114 }
1115
1116 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1117 cmd->execute_cmd = target_scsi2_reservation_release;
1118 if (cdb[0] == RELEASE_10)
1119 size = get_unaligned_be16(&cdb[7]);
1120 else
1121 size = cmd->data_length;
1122 return target_cmd_size_check(cmd, size);
1123 }
1124 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1125 cmd->execute_cmd = target_scsi2_reservation_reserve;
1126 if (cdb[0] == RESERVE_10)
1127 size = get_unaligned_be16(&cdb[7]);
1128 else
1129 size = cmd->data_length;
1130 return target_cmd_size_check(cmd, size);
1131 }
1132 }
1133
1134 /* Set DATA_CDB flag for ops that should have it */
1135 switch (cdb[0]) {
1136 case READ_6:
1137 case READ_10:
1138 case READ_12:
1139 case READ_16:
1140 case WRITE_6:
1141 case WRITE_10:
1142 case WRITE_12:
1143 case WRITE_16:
1144 case WRITE_VERIFY:
1145 case WRITE_VERIFY_12:
1146 case WRITE_VERIFY_16:
1147 case COMPARE_AND_WRITE:
1148 case XDWRITEREAD_10:
1149 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1150 break;
1151 case VARIABLE_LENGTH_CMD:
1152 switch (get_unaligned_be16(&cdb[8])) {
1153 case READ_32:
1154 case WRITE_32:
1155 case WRITE_VERIFY_32:
1156 case XDWRITEREAD_32:
1157 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1158 break;
1159 }
1160 }
1161
1162 cmd->execute_cmd = exec_cmd;
1163
1164 return TCM_NO_SENSE;
1165 }
1166 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux with added FPC-III support