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LiteX: driver for MMCM
[linux/fpc-iii.git] / drivers / target / target_core_device.c
blob7787c527aad348fd07fcf5d1ea4b7afac58ea94e
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)
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, se_cmd->orig_fe_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 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
69 deve->lun_access_ro) {
70 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
71 " Access for 0x%08llx\n",
72 se_cmd->se_tfo->fabric_name,
73 se_cmd->orig_fe_lun);
74 rcu_read_unlock();
75 return TCM_WRITE_PROTECTED;
76 }
77
78 se_lun = rcu_dereference(deve->se_lun);
79
80 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
81 se_lun = NULL;
82 goto out_unlock;
83 }
84
85 se_cmd->se_lun = se_lun;
86 se_cmd->pr_res_key = deve->pr_res_key;
87 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
88 se_cmd->lun_ref_active = true;
89 }
90 out_unlock:
91 rcu_read_unlock();
92
93 if (!se_lun) {
94 /*
95 * Use the se_portal_group->tpg_virt_lun0 to allow for
96 * REPORT_LUNS, et al to be returned when no active
97 * MappedLUN=0 exists for this Initiator Port.
98 */
99 if (se_cmd->orig_fe_lun != 0) {
100 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
101 " Access for 0x%08llx from %s\n",
102 se_cmd->se_tfo->fabric_name,
103 se_cmd->orig_fe_lun,
104 nacl->initiatorname);
105 return TCM_NON_EXISTENT_LUN;
106 }
107
108 /*
109 * Force WRITE PROTECT for virtual LUN 0
110 */
111 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
112 (se_cmd->data_direction != DMA_NONE))
113 return TCM_WRITE_PROTECTED;
114
115 se_lun = se_sess->se_tpg->tpg_virt_lun0;
116 if (!percpu_ref_tryget_live(&se_lun->lun_ref))
117 return TCM_NON_EXISTENT_LUN;
118
119 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
120 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
121 se_cmd->lun_ref_active = true;
122 }
123 /*
124 * RCU reference protected by percpu se_lun->lun_ref taken above that
125 * must drop to zero (including initial reference) before this se_lun
126 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
127 * target_core_fabric_configfs.c:target_fabric_port_release
128 */
129 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
130 atomic_long_inc(&se_cmd->se_dev->num_cmds);
131
132 if (se_cmd->data_direction == DMA_TO_DEVICE)
133 atomic_long_add(se_cmd->data_length,
134 &se_cmd->se_dev->write_bytes);
135 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
136 atomic_long_add(se_cmd->data_length,
137 &se_cmd->se_dev->read_bytes);
138
139 return ret;
140 }
141 EXPORT_SYMBOL(transport_lookup_cmd_lun);
142
143 int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
144 {
145 struct se_dev_entry *deve;
146 struct se_lun *se_lun = NULL;
147 struct se_session *se_sess = se_cmd->se_sess;
148 struct se_node_acl *nacl = se_sess->se_node_acl;
149 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
150 unsigned long flags;
151
152 rcu_read_lock();
153 deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
154 if (deve) {
155 se_lun = rcu_dereference(deve->se_lun);
156
157 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
158 se_lun = NULL;
159 goto out_unlock;
160 }
161
162 se_cmd->se_lun = se_lun;
163 se_cmd->pr_res_key = deve->pr_res_key;
164 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
165 se_cmd->lun_ref_active = true;
166 }
167 out_unlock:
168 rcu_read_unlock();
169
170 if (!se_lun) {
171 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
172 " Access for 0x%08llx for %s\n",
173 se_cmd->se_tfo->fabric_name,
174 se_cmd->orig_fe_lun,
175 nacl->initiatorname);
176 return -ENODEV;
177 }
178 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
179 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
180
181 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
182 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
183 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
184
185 return 0;
186 }
187 EXPORT_SYMBOL(transport_lookup_tmr_lun);
188
189 bool target_lun_is_rdonly(struct se_cmd *cmd)
190 {
191 struct se_session *se_sess = cmd->se_sess;
192 struct se_dev_entry *deve;
193 bool ret;
194
195 rcu_read_lock();
196 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
197 ret = deve && deve->lun_access_ro;
198 rcu_read_unlock();
199
200 return ret;
201 }
202 EXPORT_SYMBOL(target_lun_is_rdonly);
203
204 /*
205 * This function is called from core_scsi3_emulate_pro_register_and_move()
206 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
207 * when a matching rtpi is found.
208 */
209 struct se_dev_entry *core_get_se_deve_from_rtpi(
210 struct se_node_acl *nacl,
211 u16 rtpi)
212 {
213 struct se_dev_entry *deve;
214 struct se_lun *lun;
215 struct se_portal_group *tpg = nacl->se_tpg;
216
217 rcu_read_lock();
218 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
219 lun = rcu_dereference(deve->se_lun);
220 if (!lun) {
221 pr_err("%s device entries device pointer is"
222 " NULL, but Initiator has access.\n",
223 tpg->se_tpg_tfo->fabric_name);
224 continue;
225 }
226 if (lun->lun_rtpi != rtpi)
227 continue;
228
229 kref_get(&deve->pr_kref);
230 rcu_read_unlock();
231
232 return deve;
233 }
234 rcu_read_unlock();
235
236 return NULL;
237 }
238
239 void core_free_device_list_for_node(
240 struct se_node_acl *nacl,
241 struct se_portal_group *tpg)
242 {
243 struct se_dev_entry *deve;
244
245 mutex_lock(&nacl->lun_entry_mutex);
246 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
247 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
248 lockdep_is_held(&nacl->lun_entry_mutex));
249 core_disable_device_list_for_node(lun, deve, nacl, tpg);
250 }
251 mutex_unlock(&nacl->lun_entry_mutex);
252 }
253
254 void core_update_device_list_access(
255 u64 mapped_lun,
256 bool lun_access_ro,
257 struct se_node_acl *nacl)
258 {
259 struct se_dev_entry *deve;
260
261 mutex_lock(&nacl->lun_entry_mutex);
262 deve = target_nacl_find_deve(nacl, mapped_lun);
263 if (deve)
264 deve->lun_access_ro = lun_access_ro;
265 mutex_unlock(&nacl->lun_entry_mutex);
266 }
267
268 /*
269 * Called with rcu_read_lock or nacl->device_list_lock held.
270 */
271 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
272 {
273 struct se_dev_entry *deve;
274
275 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
276 if (deve->mapped_lun == mapped_lun)
277 return deve;
278
279 return NULL;
280 }
281 EXPORT_SYMBOL(target_nacl_find_deve);
282
283 void target_pr_kref_release(struct kref *kref)
284 {
285 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
286 pr_kref);
287 complete(&deve->pr_comp);
288 }
289
290 static void
291 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
292 bool skip_new)
293 {
294 struct se_dev_entry *tmp;
295
296 rcu_read_lock();
297 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
298 if (skip_new && tmp == new)
299 continue;
300 core_scsi3_ua_allocate(tmp, 0x3F,
301 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
302 }
303 rcu_read_unlock();
304 }
305
306 int core_enable_device_list_for_node(
307 struct se_lun *lun,
308 struct se_lun_acl *lun_acl,
309 u64 mapped_lun,
310 bool lun_access_ro,
311 struct se_node_acl *nacl,
312 struct se_portal_group *tpg)
313 {
314 struct se_dev_entry *orig, *new;
315
316 new = kzalloc(sizeof(*new), GFP_KERNEL);
317 if (!new) {
318 pr_err("Unable to allocate se_dev_entry memory\n");
319 return -ENOMEM;
320 }
321
322 spin_lock_init(&new->ua_lock);
323 INIT_LIST_HEAD(&new->ua_list);
324 INIT_LIST_HEAD(&new->lun_link);
325
326 new->mapped_lun = mapped_lun;
327 kref_init(&new->pr_kref);
328 init_completion(&new->pr_comp);
329
330 new->lun_access_ro = lun_access_ro;
331 new->creation_time = get_jiffies_64();
332 new->attach_count++;
333
334 mutex_lock(&nacl->lun_entry_mutex);
335 orig = target_nacl_find_deve(nacl, mapped_lun);
336 if (orig && orig->se_lun) {
337 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
338 lockdep_is_held(&nacl->lun_entry_mutex));
339
340 if (orig_lun != lun) {
341 pr_err("Existing orig->se_lun doesn't match new lun"
342 " for dynamic -> explicit NodeACL conversion:"
343 " %s\n", nacl->initiatorname);
344 mutex_unlock(&nacl->lun_entry_mutex);
345 kfree(new);
346 return -EINVAL;
347 }
348 if (orig->se_lun_acl != NULL) {
349 pr_warn_ratelimited("Detected existing explicit"
350 " se_lun_acl->se_lun_group reference for %s"
351 " mapped_lun: %llu, failing\n",
352 nacl->initiatorname, mapped_lun);
353 mutex_unlock(&nacl->lun_entry_mutex);
354 kfree(new);
355 return -EINVAL;
356 }
357
358 rcu_assign_pointer(new->se_lun, lun);
359 rcu_assign_pointer(new->se_lun_acl, lun_acl);
360 hlist_del_rcu(&orig->link);
361 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
362 mutex_unlock(&nacl->lun_entry_mutex);
363
364 spin_lock(&lun->lun_deve_lock);
365 list_del(&orig->lun_link);
366 list_add_tail(&new->lun_link, &lun->lun_deve_list);
367 spin_unlock(&lun->lun_deve_lock);
368
369 kref_put(&orig->pr_kref, target_pr_kref_release);
370 wait_for_completion(&orig->pr_comp);
371
372 target_luns_data_has_changed(nacl, new, true);
373 kfree_rcu(orig, rcu_head);
374 return 0;
375 }
376
377 rcu_assign_pointer(new->se_lun, lun);
378 rcu_assign_pointer(new->se_lun_acl, lun_acl);
379 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
380 mutex_unlock(&nacl->lun_entry_mutex);
381
382 spin_lock(&lun->lun_deve_lock);
383 list_add_tail(&new->lun_link, &lun->lun_deve_list);
384 spin_unlock(&lun->lun_deve_lock);
385
386 target_luns_data_has_changed(nacl, new, true);
387 return 0;
388 }
389
390 void core_disable_device_list_for_node(
391 struct se_lun *lun,
392 struct se_dev_entry *orig,
393 struct se_node_acl *nacl,
394 struct se_portal_group *tpg)
395 {
396 /*
397 * rcu_dereference_raw protected by se_lun->lun_group symlink
398 * reference to se_device->dev_group.
399 */
400 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
401
402 lockdep_assert_held(&nacl->lun_entry_mutex);
403
404 /*
405 * If the MappedLUN entry is being disabled, the entry in
406 * lun->lun_deve_list must be removed now before clearing the
407 * struct se_dev_entry pointers below as logic in
408 * core_alua_do_transition_tg_pt() depends on these being present.
409 *
410 * deve->se_lun_acl will be NULL for demo-mode created LUNs
411 * that have not been explicitly converted to MappedLUNs ->
412 * struct se_lun_acl, but we remove deve->lun_link from
413 * lun->lun_deve_list. This also means that active UAs and
414 * NodeACL context specific PR metadata for demo-mode
415 * MappedLUN *deve will be released below..
416 */
417 spin_lock(&lun->lun_deve_lock);
418 list_del(&orig->lun_link);
419 spin_unlock(&lun->lun_deve_lock);
420 /*
421 * Disable struct se_dev_entry LUN ACL mapping
422 */
423 core_scsi3_ua_release_all(orig);
424
425 hlist_del_rcu(&orig->link);
426 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
427 orig->lun_access_ro = false;
428 orig->creation_time = 0;
429 orig->attach_count--;
430 /*
431 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
432 * or REGISTER_AND_MOVE PR operation to complete.
433 */
434 kref_put(&orig->pr_kref, target_pr_kref_release);
435 wait_for_completion(&orig->pr_comp);
436
437 rcu_assign_pointer(orig->se_lun, NULL);
438 rcu_assign_pointer(orig->se_lun_acl, NULL);
439
440 kfree_rcu(orig, rcu_head);
441
442 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
443 target_luns_data_has_changed(nacl, NULL, false);
444 }
445
446 /* core_clear_lun_from_tpg():
447 *
448 *
449 */
450 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
451 {
452 struct se_node_acl *nacl;
453 struct se_dev_entry *deve;
454
455 mutex_lock(&tpg->acl_node_mutex);
456 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
457
458 mutex_lock(&nacl->lun_entry_mutex);
459 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
460 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
461 lockdep_is_held(&nacl->lun_entry_mutex));
462
463 if (lun != tmp_lun)
464 continue;
465
466 core_disable_device_list_for_node(lun, deve, nacl, tpg);
467 }
468 mutex_unlock(&nacl->lun_entry_mutex);
469 }
470 mutex_unlock(&tpg->acl_node_mutex);
471 }
472
473 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
474 {
475 struct se_lun *tmp;
476
477 spin_lock(&dev->se_port_lock);
478 if (dev->export_count == 0x0000ffff) {
479 pr_warn("Reached dev->dev_port_count =="
480 " 0x0000ffff\n");
481 spin_unlock(&dev->se_port_lock);
482 return -ENOSPC;
483 }
484 again:
485 /*
486 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
487 * Here is the table from spc4r17 section 7.7.3.8.
488 *
489 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
490 *
491 * Code Description
492 * 0h Reserved
493 * 1h Relative port 1, historically known as port A
494 * 2h Relative port 2, historically known as port B
495 * 3h to FFFFh Relative port 3 through 65 535
496 */
497 lun->lun_rtpi = dev->dev_rpti_counter++;
498 if (!lun->lun_rtpi)
499 goto again;
500
501 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
502 /*
503 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
504 * for 16-bit wrap..
505 */
506 if (lun->lun_rtpi == tmp->lun_rtpi)
507 goto again;
508 }
509 spin_unlock(&dev->se_port_lock);
510
511 return 0;
512 }
513
514 static void se_release_vpd_for_dev(struct se_device *dev)
515 {
516 struct t10_vpd *vpd, *vpd_tmp;
517
518 spin_lock(&dev->t10_wwn.t10_vpd_lock);
519 list_for_each_entry_safe(vpd, vpd_tmp,
520 &dev->t10_wwn.t10_vpd_list, vpd_list) {
521 list_del(&vpd->vpd_list);
522 kfree(vpd);
523 }
524 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
525 }
526
527 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
528 {
529 u32 aligned_max_sectors;
530 u32 alignment;
531 /*
532 * Limit max_sectors to a PAGE_SIZE aligned value for modern
533 * transport_allocate_data_tasks() operation.
534 */
535 alignment = max(1ul, PAGE_SIZE / block_size);
536 aligned_max_sectors = rounddown(max_sectors, alignment);
537
538 if (max_sectors != aligned_max_sectors)
539 pr_info("Rounding down aligned max_sectors from %u to %u\n",
540 max_sectors, aligned_max_sectors);
541
542 return aligned_max_sectors;
543 }
544
545 int core_dev_add_lun(
546 struct se_portal_group *tpg,
547 struct se_device *dev,
548 struct se_lun *lun)
549 {
550 int rc;
551
552 rc = core_tpg_add_lun(tpg, lun, false, dev);
553 if (rc < 0)
554 return rc;
555
556 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
557 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
558 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
559 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
560 /*
561 * Update LUN maps for dynamically added initiators when
562 * generate_node_acl is enabled.
563 */
564 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
565 struct se_node_acl *acl;
566
567 mutex_lock(&tpg->acl_node_mutex);
568 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
569 if (acl->dynamic_node_acl &&
570 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
571 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
572 core_tpg_add_node_to_devs(acl, tpg, lun);
573 }
574 }
575 mutex_unlock(&tpg->acl_node_mutex);
576 }
577
578 return 0;
579 }
580
581 /* core_dev_del_lun():
582 *
583 *
584 */
585 void core_dev_del_lun(
586 struct se_portal_group *tpg,
587 struct se_lun *lun)
588 {
589 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
590 " device object\n", tpg->se_tpg_tfo->fabric_name,
591 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
592 tpg->se_tpg_tfo->fabric_name);
593
594 core_tpg_remove_lun(tpg, lun);
595 }
596
597 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
598 struct se_portal_group *tpg,
599 struct se_node_acl *nacl,
600 u64 mapped_lun,
601 int *ret)
602 {
603 struct se_lun_acl *lacl;
604
605 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
606 pr_err("%s InitiatorName exceeds maximum size.\n",
607 tpg->se_tpg_tfo->fabric_name);
608 *ret = -EOVERFLOW;
609 return NULL;
610 }
611 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
612 if (!lacl) {
613 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
614 *ret = -ENOMEM;
615 return NULL;
616 }
617
618 lacl->mapped_lun = mapped_lun;
619 lacl->se_lun_nacl = nacl;
620
621 return lacl;
622 }
623
624 int core_dev_add_initiator_node_lun_acl(
625 struct se_portal_group *tpg,
626 struct se_lun_acl *lacl,
627 struct se_lun *lun,
628 bool lun_access_ro)
629 {
630 struct se_node_acl *nacl = lacl->se_lun_nacl;
631 /*
632 * rcu_dereference_raw protected by se_lun->lun_group symlink
633 * reference to se_device->dev_group.
634 */
635 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
636
637 if (!nacl)
638 return -EINVAL;
639
640 if (lun->lun_access_ro)
641 lun_access_ro = true;
642
643 lacl->se_lun = lun;
644
645 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
646 lun_access_ro, nacl, tpg) < 0)
647 return -EINVAL;
648
649 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
650 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
651 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
652 lun_access_ro ? "RO" : "RW",
653 nacl->initiatorname);
654 /*
655 * Check to see if there are any existing persistent reservation APTPL
656 * pre-registrations that need to be enabled for this LUN ACL..
657 */
658 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
659 lacl->mapped_lun);
660 return 0;
661 }
662
663 int core_dev_del_initiator_node_lun_acl(
664 struct se_lun *lun,
665 struct se_lun_acl *lacl)
666 {
667 struct se_portal_group *tpg = lun->lun_tpg;
668 struct se_node_acl *nacl;
669 struct se_dev_entry *deve;
670
671 nacl = lacl->se_lun_nacl;
672 if (!nacl)
673 return -EINVAL;
674
675 mutex_lock(&nacl->lun_entry_mutex);
676 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
677 if (deve)
678 core_disable_device_list_for_node(lun, deve, nacl, tpg);
679 mutex_unlock(&nacl->lun_entry_mutex);
680
681 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
682 " InitiatorNode: %s Mapped LUN: %llu\n",
683 tpg->se_tpg_tfo->fabric_name,
684 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
685 nacl->initiatorname, lacl->mapped_lun);
686
687 return 0;
688 }
689
690 void core_dev_free_initiator_node_lun_acl(
691 struct se_portal_group *tpg,
692 struct se_lun_acl *lacl)
693 {
694 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
695 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
696 tpg->se_tpg_tfo->tpg_get_tag(tpg),
697 tpg->se_tpg_tfo->fabric_name,
698 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
699
700 kfree(lacl);
701 }
702
703 static void scsi_dump_inquiry(struct se_device *dev)
704 {
705 struct t10_wwn *wwn = &dev->t10_wwn;
706 int device_type = dev->transport->get_device_type(dev);
707
708 /*
709 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
710 */
711 pr_debug(" Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
712 wwn->vendor);
713 pr_debug(" Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
714 wwn->model);
715 pr_debug(" Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
716 wwn->revision);
717 pr_debug(" Type: %s ", scsi_device_type(device_type));
718 }
719
720 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
721 {
722 struct se_device *dev;
723 struct se_lun *xcopy_lun;
724 int i;
725
726 dev = hba->backend->ops->alloc_device(hba, name);
727 if (!dev)
728 return NULL;
729
730 dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
731 if (!dev->queues) {
732 dev->transport->free_device(dev);
733 return NULL;
734 }
735
736 dev->queue_cnt = nr_cpu_ids;
737 for (i = 0; i < dev->queue_cnt; i++) {
738 INIT_LIST_HEAD(&dev->queues[i].state_list);
739 spin_lock_init(&dev->queues[i].lock);
740 }
741
742 dev->se_hba = hba;
743 dev->transport = hba->backend->ops;
744 dev->transport_flags = dev->transport->transport_flags_default;
745 dev->prot_length = sizeof(struct t10_pi_tuple);
746 dev->hba_index = hba->hba_index;
747
748 INIT_LIST_HEAD(&dev->dev_sep_list);
749 INIT_LIST_HEAD(&dev->dev_tmr_list);
750 INIT_LIST_HEAD(&dev->delayed_cmd_list);
751 INIT_LIST_HEAD(&dev->qf_cmd_list);
752 spin_lock_init(&dev->delayed_cmd_lock);
753 spin_lock_init(&dev->dev_reservation_lock);
754 spin_lock_init(&dev->se_port_lock);
755 spin_lock_init(&dev->se_tmr_lock);
756 spin_lock_init(&dev->qf_cmd_lock);
757 sema_init(&dev->caw_sem, 1);
758 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
759 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
760 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
761 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
762 spin_lock_init(&dev->t10_pr.registration_lock);
763 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
764 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
765 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
766 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
767 spin_lock_init(&dev->t10_alua.lba_map_lock);
768
769 dev->t10_wwn.t10_dev = dev;
770 dev->t10_alua.t10_dev = dev;
771
772 dev->dev_attrib.da_dev = dev;
773 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
774 dev->dev_attrib.emulate_dpo = 1;
775 dev->dev_attrib.emulate_fua_write = 1;
776 dev->dev_attrib.emulate_fua_read = 1;
777 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
778 dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
779 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
780 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
781 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
782 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
783 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
784 dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
785 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
786 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
787 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
788 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
789 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
790 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
791 dev->dev_attrib.max_unmap_block_desc_count =
792 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
793 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
794 dev->dev_attrib.unmap_granularity_alignment =
795 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
796 dev->dev_attrib.unmap_zeroes_data =
797 DA_UNMAP_ZEROES_DATA_DEFAULT;
798 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
799
800 xcopy_lun = &dev->xcopy_lun;
801 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
802 init_completion(&xcopy_lun->lun_shutdown_comp);
803 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
804 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
805 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
806 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
807
808 /* Preload the default INQUIRY const values */
809 strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
810 strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
811 sizeof(dev->t10_wwn.model));
812 strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
813 sizeof(dev->t10_wwn.revision));
814
815 return dev;
816 }
817
818 /*
819 * Check if the underlying struct block_device request_queue supports
820 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
821 * in ATA and we need to set TPE=1
822 */
823 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
824 struct request_queue *q)
825 {
826 int block_size = queue_logical_block_size(q);
827
828 if (!blk_queue_discard(q))
829 return false;
830
831 attrib->max_unmap_lba_count =
832 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
833 /*
834 * Currently hardcoded to 1 in Linux/SCSI code..
835 */
836 attrib->max_unmap_block_desc_count = 1;
837 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
838 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
839 block_size;
840 attrib->unmap_zeroes_data = !!(q->limits.max_write_zeroes_sectors);
841 return true;
842 }
843 EXPORT_SYMBOL(target_configure_unmap_from_queue);
844
845 /*
846 * Convert from blocksize advertised to the initiator to the 512 byte
847 * units unconditionally used by the Linux block layer.
848 */
849 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
850 {
851 switch (dev->dev_attrib.block_size) {
852 case 4096:
853 return lb << 3;
854 case 2048:
855 return lb << 2;
856 case 1024:
857 return lb << 1;
858 default:
859 return lb;
860 }
861 }
862 EXPORT_SYMBOL(target_to_linux_sector);
863
864 struct devices_idr_iter {
865 struct config_item *prev_item;
866 int (*fn)(struct se_device *dev, void *data);
867 void *data;
868 };
869
870 static int target_devices_idr_iter(int id, void *p, void *data)
871 __must_hold(&device_mutex)
872 {
873 struct devices_idr_iter *iter = data;
874 struct se_device *dev = p;
875 int ret;
876
877 config_item_put(iter->prev_item);
878 iter->prev_item = NULL;
879
880 /*
881 * We add the device early to the idr, so it can be used
882 * by backend modules during configuration. We do not want
883 * to allow other callers to access partially setup devices,
884 * so we skip them here.
885 */
886 if (!target_dev_configured(dev))
887 return 0;
888
889 iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
890 if (!iter->prev_item)
891 return 0;
892 mutex_unlock(&device_mutex);
893
894 ret = iter->fn(dev, iter->data);
895
896 mutex_lock(&device_mutex);
897 return ret;
898 }
899
900 /**
901 * target_for_each_device - iterate over configured devices
902 * @fn: iterator function
903 * @data: pointer to data that will be passed to fn
904 *
905 * fn must return 0 to continue looping over devices. non-zero will break
906 * from the loop and return that value to the caller.
907 */
908 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
909 void *data)
910 {
911 struct devices_idr_iter iter = { .fn = fn, .data = data };
912 int ret;
913
914 mutex_lock(&device_mutex);
915 ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
916 mutex_unlock(&device_mutex);
917 config_item_put(iter.prev_item);
918 return ret;
919 }
920
921 int target_configure_device(struct se_device *dev)
922 {
923 struct se_hba *hba = dev->se_hba;
924 int ret, id;
925
926 if (target_dev_configured(dev)) {
927 pr_err("se_dev->se_dev_ptr already set for storage"
928 " object\n");
929 return -EEXIST;
930 }
931
932 /*
933 * Add early so modules like tcmu can use during its
934 * configuration.
935 */
936 mutex_lock(&device_mutex);
937 /*
938 * Use cyclic to try and avoid collisions with devices
939 * that were recently removed.
940 */
941 id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
942 mutex_unlock(&device_mutex);
943 if (id < 0) {
944 ret = -ENOMEM;
945 goto out;
946 }
947 dev->dev_index = id;
948
949 ret = dev->transport->configure_device(dev);
950 if (ret)
951 goto out_free_index;
952 /*
953 * XXX: there is not much point to have two different values here..
954 */
955 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
956 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
957
958 /*
959 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
960 */
961 dev->dev_attrib.hw_max_sectors =
962 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
963 dev->dev_attrib.hw_block_size);
964 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
965
966 dev->creation_time = get_jiffies_64();
967
968 ret = core_setup_alua(dev);
969 if (ret)
970 goto out_destroy_device;
971
972 /*
973 * Setup work_queue for QUEUE_FULL
974 */
975 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
976
977 scsi_dump_inquiry(dev);
978
979 spin_lock(&hba->device_lock);
980 hba->dev_count++;
981 spin_unlock(&hba->device_lock);
982
983 dev->dev_flags |= DF_CONFIGURED;
984
985 return 0;
986
987 out_destroy_device:
988 dev->transport->destroy_device(dev);
989 out_free_index:
990 mutex_lock(&device_mutex);
991 idr_remove(&devices_idr, dev->dev_index);
992 mutex_unlock(&device_mutex);
993 out:
994 se_release_vpd_for_dev(dev);
995 return ret;
996 }
997
998 void target_free_device(struct se_device *dev)
999 {
1000 struct se_hba *hba = dev->se_hba;
1001
1002 WARN_ON(!list_empty(&dev->dev_sep_list));
1003
1004 if (target_dev_configured(dev)) {
1005 dev->transport->destroy_device(dev);
1006
1007 mutex_lock(&device_mutex);
1008 idr_remove(&devices_idr, dev->dev_index);
1009 mutex_unlock(&device_mutex);
1010
1011 spin_lock(&hba->device_lock);
1012 hba->dev_count--;
1013 spin_unlock(&hba->device_lock);
1014 }
1015
1016 core_alua_free_lu_gp_mem(dev);
1017 core_alua_set_lba_map(dev, NULL, 0, 0);
1018 core_scsi3_free_all_registrations(dev);
1019 se_release_vpd_for_dev(dev);
1020
1021 if (dev->transport->free_prot)
1022 dev->transport->free_prot(dev);
1023
1024 kfree(dev->queues);
1025 dev->transport->free_device(dev);
1026 }
1027
1028 int core_dev_setup_virtual_lun0(void)
1029 {
1030 struct se_hba *hba;
1031 struct se_device *dev;
1032 char buf[] = "rd_pages=8,rd_nullio=1";
1033 int ret;
1034
1035 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1036 if (IS_ERR(hba))
1037 return PTR_ERR(hba);
1038
1039 dev = target_alloc_device(hba, "virt_lun0");
1040 if (!dev) {
1041 ret = -ENOMEM;
1042 goto out_free_hba;
1043 }
1044
1045 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1046
1047 ret = target_configure_device(dev);
1048 if (ret)
1049 goto out_free_se_dev;
1050
1051 lun0_hba = hba;
1052 g_lun0_dev = dev;
1053 return 0;
1054
1055 out_free_se_dev:
1056 target_free_device(dev);
1057 out_free_hba:
1058 core_delete_hba(hba);
1059 return ret;
1060 }
1061
1062
1063 void core_dev_release_virtual_lun0(void)
1064 {
1065 struct se_hba *hba = lun0_hba;
1066
1067 if (!hba)
1068 return;
1069
1070 if (g_lun0_dev)
1071 target_free_device(g_lun0_dev);
1072 core_delete_hba(hba);
1073 }
1074
1075 /*
1076 * Common CDB parsing for kernel and user passthrough.
1077 */
1078 sense_reason_t
1079 passthrough_parse_cdb(struct se_cmd *cmd,
1080 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1081 {
1082 unsigned char *cdb = cmd->t_task_cdb;
1083 struct se_device *dev = cmd->se_dev;
1084 unsigned int size;
1085
1086 /*
1087 * For REPORT LUNS we always need to emulate the response, for everything
1088 * else, pass it up.
1089 */
1090 if (cdb[0] == REPORT_LUNS) {
1091 cmd->execute_cmd = spc_emulate_report_luns;
1092 return TCM_NO_SENSE;
1093 }
1094
1095 /*
1096 * With emulate_pr disabled, all reservation requests should fail,
1097 * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1098 */
1099 if (!dev->dev_attrib.emulate_pr &&
1100 ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1101 (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1102 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1103 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1104 return TCM_UNSUPPORTED_SCSI_OPCODE;
1105 }
1106
1107 /*
1108 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1109 * emulate the response, since tcmu does not have the information
1110 * required to process these commands.
1111 */
1112 if (!(dev->transport_flags &
1113 TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1114 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1115 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1116 size = get_unaligned_be16(&cdb[7]);
1117 return target_cmd_size_check(cmd, size);
1118 }
1119 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1120 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1121 size = get_unaligned_be32(&cdb[5]);
1122 return target_cmd_size_check(cmd, size);
1123 }
1124
1125 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1126 cmd->execute_cmd = target_scsi2_reservation_release;
1127 if (cdb[0] == RELEASE_10)
1128 size = get_unaligned_be16(&cdb[7]);
1129 else
1130 size = cmd->data_length;
1131 return target_cmd_size_check(cmd, size);
1132 }
1133 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1134 cmd->execute_cmd = target_scsi2_reservation_reserve;
1135 if (cdb[0] == RESERVE_10)
1136 size = get_unaligned_be16(&cdb[7]);
1137 else
1138 size = cmd->data_length;
1139 return target_cmd_size_check(cmd, size);
1140 }
1141 }
1142
1143 /* Set DATA_CDB flag for ops that should have it */
1144 switch (cdb[0]) {
1145 case READ_6:
1146 case READ_10:
1147 case READ_12:
1148 case READ_16:
1149 case WRITE_6:
1150 case WRITE_10:
1151 case WRITE_12:
1152 case WRITE_16:
1153 case WRITE_VERIFY:
1154 case WRITE_VERIFY_12:
1155 case WRITE_VERIFY_16:
1156 case COMPARE_AND_WRITE:
1157 case XDWRITEREAD_10:
1158 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1159 break;
1160 case VARIABLE_LENGTH_CMD:
1161 switch (get_unaligned_be16(&cdb[8])) {
1162 case READ_32:
1163 case WRITE_32:
1164 case WRITE_VERIFY_32:
1165 case XDWRITEREAD_32:
1166 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1167 break;
1168 }
1169 }
1170
1171 cmd->execute_cmd = exec_cmd;
1172
1173 return TCM_NO_SENSE;
1174 }
1175 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux with added FPC-III support