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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * scsi_sysfs.c
4 *
5 * SCSI sysfs interface routines.
6 *
7 * Created to pull SCSI mid layer sysfs routines into one file.
8 */
9
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/init.h>
13#include <linux/blkdev.h>
14#include <linux/device.h>
15#include <linux/pm_runtime.h>
16#include <linux/bsg.h>
17
18#include <scsi/scsi.h>
19#include <scsi/scsi_device.h>
20#include <scsi/scsi_host.h>
21#include <scsi/scsi_tcq.h>
22#include <scsi/scsi_dh.h>
23#include <scsi/scsi_transport.h>
24#include <scsi/scsi_driver.h>
25#include <scsi/scsi_devinfo.h>
26
27#include "scsi_priv.h"
28#include "scsi_logging.h"
29
30static const struct device_type scsi_dev_type;
31
32static const struct {
33 enum scsi_device_state value;
34 char *name;
35} sdev_states[] = {
36 { SDEV_CREATED, "created" },
37 { SDEV_RUNNING, "running" },
38 { SDEV_CANCEL, "cancel" },
39 { SDEV_DEL, "deleted" },
40 { SDEV_QUIESCE, "quiesce" },
41 { SDEV_OFFLINE, "offline" },
42 { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
43 { SDEV_BLOCK, "blocked" },
44 { SDEV_CREATED_BLOCK, "created-blocked" },
45};
46
47const char *scsi_device_state_name(enum scsi_device_state state)
48{
49 int i;
50 char *name = NULL;
51
52 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
53 if (sdev_states[i].value == state) {
54 name = sdev_states[i].name;
55 break;
56 }
57 }
58 return name;
59}
60
61static const struct {
62 enum scsi_host_state value;
63 char *name;
64} shost_states[] = {
65 { SHOST_CREATED, "created" },
66 { SHOST_RUNNING, "running" },
67 { SHOST_CANCEL, "cancel" },
68 { SHOST_DEL, "deleted" },
69 { SHOST_RECOVERY, "recovery" },
70 { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
71 { SHOST_DEL_RECOVERY, "deleted/recovery", },
72};
73const char *scsi_host_state_name(enum scsi_host_state state)
74{
75 int i;
76 char *name = NULL;
77
78 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
79 if (shost_states[i].value == state) {
80 name = shost_states[i].name;
81 break;
82 }
83 }
84 return name;
85}
86
87#ifdef CONFIG_SCSI_DH
88static const struct {
89 unsigned char value;
90 char *name;
91} sdev_access_states[] = {
92 { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
93 { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
94 { SCSI_ACCESS_STATE_STANDBY, "standby" },
95 { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
96 { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
97 { SCSI_ACCESS_STATE_OFFLINE, "offline" },
98 { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
99};
100
101static const char *scsi_access_state_name(unsigned char state)
102{
103 int i;
104 char *name = NULL;
105
106 for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
107 if (sdev_access_states[i].value == state) {
108 name = sdev_access_states[i].name;
109 break;
110 }
111 }
112 return name;
113}
114#endif
115
116static int check_set(unsigned long long *val, char *src)
117{
118 char *last;
119
120 if (strcmp(src, "-") == 0) {
121 *val = SCAN_WILD_CARD;
122 } else {
123 /*
124 * Doesn't check for int overflow
125 */
126 *val = simple_strtoull(src, &last, 0);
127 if (*last != '\0')
128 return 1;
129 }
130 return 0;
131}
132
133static int scsi_scan(struct Scsi_Host *shost, const char *str)
134{
135 char s1[15], s2[15], s3[17], junk;
136 unsigned long long channel, id, lun;
137 int res;
138
139 res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
140 if (res != 3)
141 return -EINVAL;
142 if (check_set(&channel, s1))
143 return -EINVAL;
144 if (check_set(&id, s2))
145 return -EINVAL;
146 if (check_set(&lun, s3))
147 return -EINVAL;
148 if (shost->transportt->user_scan)
149 res = shost->transportt->user_scan(shost, channel, id, lun);
150 else
151 res = scsi_scan_host_selected(shost, channel, id, lun,
152 SCSI_SCAN_MANUAL);
153 return res;
154}
155
156/*
157 * shost_show_function: macro to create an attr function that can be used to
158 * show a non-bit field.
159 */
160#define shost_show_function(name, field, format_string) \
161static ssize_t \
162show_##name (struct device *dev, struct device_attribute *attr, \
163 char *buf) \
164{ \
165 struct Scsi_Host *shost = class_to_shost(dev); \
166 return snprintf (buf, 20, format_string, shost->field); \
167}
168
169/*
170 * shost_rd_attr: macro to create a function and attribute variable for a
171 * read only field.
172 */
173#define shost_rd_attr2(name, field, format_string) \
174 shost_show_function(name, field, format_string) \
175static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
176
177#define shost_rd_attr(field, format_string) \
178shost_rd_attr2(field, field, format_string)
179
180/*
181 * Create the actual show/store functions and data structures.
182 */
183
184static ssize_t
185store_scan(struct device *dev, struct device_attribute *attr,
186 const char *buf, size_t count)
187{
188 struct Scsi_Host *shost = class_to_shost(dev);
189 int res;
190
191 res = scsi_scan(shost, buf);
192 if (res == 0)
193 res = count;
194 return res;
195};
196static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
197
198static ssize_t
199store_shost_state(struct device *dev, struct device_attribute *attr,
200 const char *buf, size_t count)
201{
202 int i;
203 struct Scsi_Host *shost = class_to_shost(dev);
204 enum scsi_host_state state = 0;
205
206 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
207 const int len = strlen(shost_states[i].name);
208 if (strncmp(shost_states[i].name, buf, len) == 0 &&
209 buf[len] == '\n') {
210 state = shost_states[i].value;
211 break;
212 }
213 }
214 if (!state)
215 return -EINVAL;
216
217 scoped_guard(spinlock_irq, shost->host_lock)
218 if (scsi_host_set_state(shost, state))
219 return -EINVAL;
220 return count;
221}
222
223static ssize_t
224show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
225{
226 struct Scsi_Host *shost = class_to_shost(dev);
227 const char *name = scsi_host_state_name(scsi_get_host_state(shost));
228
229 if (!name)
230 return -EINVAL;
231
232 return snprintf(buf, 20, "%s\n", name);
233}
234
235/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
236static struct device_attribute dev_attr_hstate =
237 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
238
239static ssize_t
240show_shost_mode(unsigned int mode, char *buf)
241{
242 ssize_t len = 0;
243
244 if (mode & MODE_INITIATOR)
245 len = sprintf(buf, "%s", "Initiator");
246
247 if (mode & MODE_TARGET)
248 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
249
250 len += sprintf(buf + len, "\n");
251
252 return len;
253}
254
255static ssize_t
256show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
257 char *buf)
258{
259 struct Scsi_Host *shost = class_to_shost(dev);
260 unsigned int supported_mode = shost->hostt->supported_mode;
261
262 if (supported_mode == MODE_UNKNOWN)
263 /* by default this should be initiator */
264 supported_mode = MODE_INITIATOR;
265
266 return show_shost_mode(supported_mode, buf);
267}
268
269static DEVICE_ATTR(supported_mode, S_IRUGO, show_shost_supported_mode, NULL);
270
271static ssize_t
272show_shost_active_mode(struct device *dev,
273 struct device_attribute *attr, char *buf)
274{
275 struct Scsi_Host *shost = class_to_shost(dev);
276
277 if (shost->active_mode == MODE_UNKNOWN)
278 return snprintf(buf, 20, "unknown\n");
279 else
280 return show_shost_mode(shost->active_mode, buf);
281}
282
283static DEVICE_ATTR(active_mode, S_IRUGO, show_shost_active_mode, NULL);
284
285static int check_reset_type(const char *str)
286{
287 if (sysfs_streq(str, "adapter"))
288 return SCSI_ADAPTER_RESET;
289 else if (sysfs_streq(str, "firmware"))
290 return SCSI_FIRMWARE_RESET;
291 else
292 return 0;
293}
294
295static ssize_t
296store_host_reset(struct device *dev, struct device_attribute *attr,
297 const char *buf, size_t count)
298{
299 struct Scsi_Host *shost = class_to_shost(dev);
300 const struct scsi_host_template *sht = shost->hostt;
301 int ret = -EINVAL;
302 int type;
303
304 type = check_reset_type(buf);
305 if (!type)
306 goto exit_store_host_reset;
307
308 if (sht->host_reset)
309 ret = sht->host_reset(shost, type);
310 else
311 ret = -EOPNOTSUPP;
312
313exit_store_host_reset:
314 if (ret == 0)
315 ret = count;
316 return ret;
317}
318
319static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
320
321static ssize_t
322show_shost_eh_deadline(struct device *dev,
323 struct device_attribute *attr, char *buf)
324{
325 struct Scsi_Host *shost = class_to_shost(dev);
326
327 if (shost->eh_deadline == -1)
328 return snprintf(buf, strlen("off") + 2, "off\n");
329 return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
330}
331
332static ssize_t
333store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
334 const char *buf, size_t count)
335{
336 struct Scsi_Host *shost = class_to_shost(dev);
337 int ret = -EINVAL;
338 unsigned long deadline, flags;
339
340 if (shost->transportt &&
341 (shost->transportt->eh_strategy_handler ||
342 !shost->hostt->eh_host_reset_handler))
343 return ret;
344
345 if (!strncmp(buf, "off", strlen("off")))
346 deadline = -1;
347 else {
348 ret = kstrtoul(buf, 10, &deadline);
349 if (ret)
350 return ret;
351 if (deadline * HZ > UINT_MAX)
352 return -EINVAL;
353 }
354
355 spin_lock_irqsave(shost->host_lock, flags);
356 if (scsi_host_in_recovery(shost))
357 ret = -EBUSY;
358 else {
359 if (deadline == -1)
360 shost->eh_deadline = -1;
361 else
362 shost->eh_deadline = deadline * HZ;
363
364 ret = count;
365 }
366 spin_unlock_irqrestore(shost->host_lock, flags);
367
368 return ret;
369}
370
371static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
372
373shost_rd_attr(unique_id, "%u\n");
374shost_rd_attr(cmd_per_lun, "%hd\n");
375shost_rd_attr(can_queue, "%d\n");
376shost_rd_attr(sg_tablesize, "%hu\n");
377shost_rd_attr(sg_prot_tablesize, "%hu\n");
378shost_rd_attr(prot_capabilities, "%u\n");
379shost_rd_attr(prot_guard_type, "%hd\n");
380shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
381
382static ssize_t
383show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
384{
385 struct Scsi_Host *shost = class_to_shost(dev);
386 return snprintf(buf, 20, "%d\n", scsi_host_busy(shost));
387}
388static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
389
390static ssize_t
391show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
392{
393 return sprintf(buf, "1\n");
394}
395static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
396
397static ssize_t
398show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf)
399{
400 struct Scsi_Host *shost = class_to_shost(dev);
401 struct blk_mq_tag_set *tag_set = &shost->tag_set;
402
403 return snprintf(buf, 20, "%d\n", tag_set->nr_hw_queues);
404}
405static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL);
406
407static struct attribute *scsi_sysfs_shost_attrs[] = {
408 &dev_attr_use_blk_mq.attr,
409 &dev_attr_unique_id.attr,
410 &dev_attr_host_busy.attr,
411 &dev_attr_cmd_per_lun.attr,
412 &dev_attr_can_queue.attr,
413 &dev_attr_sg_tablesize.attr,
414 &dev_attr_sg_prot_tablesize.attr,
415 &dev_attr_proc_name.attr,
416 &dev_attr_scan.attr,
417 &dev_attr_hstate.attr,
418 &dev_attr_supported_mode.attr,
419 &dev_attr_active_mode.attr,
420 &dev_attr_prot_capabilities.attr,
421 &dev_attr_prot_guard_type.attr,
422 &dev_attr_host_reset.attr,
423 &dev_attr_eh_deadline.attr,
424 &dev_attr_nr_hw_queues.attr,
425 NULL
426};
427
428static const struct attribute_group scsi_shost_attr_group = {
429 .attrs = scsi_sysfs_shost_attrs,
430};
431
432const struct attribute_group *scsi_shost_groups[] = {
433 &scsi_shost_attr_group,
434 NULL
435};
436
437static void scsi_device_cls_release(struct device *class_dev)
438{
439 struct scsi_device *sdev;
440
441 sdev = class_to_sdev(class_dev);
442 put_device(&sdev->sdev_gendev);
443}
444
445static void scsi_device_dev_release(struct device *dev)
446{
447 struct scsi_device *sdev = to_scsi_device(dev);
448 struct device *parent;
449 struct list_head *this, *tmp;
450 struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
451 struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
452 struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = NULL;
453 struct scsi_vpd *vpd_pgb7 = NULL;
454 unsigned long flags;
455
456 might_sleep();
457
458 scsi_dh_release_device(sdev);
459
460 parent = sdev->sdev_gendev.parent;
461
462 spin_lock_irqsave(sdev->host->host_lock, flags);
463 list_del(&sdev->siblings);
464 list_del(&sdev->same_target_siblings);
465 list_del(&sdev->starved_entry);
466 spin_unlock_irqrestore(sdev->host->host_lock, flags);
467
468 cancel_work_sync(&sdev->event_work);
469
470 list_for_each_safe(this, tmp, &sdev->event_list) {
471 struct scsi_event *evt;
472
473 evt = list_entry(this, struct scsi_event, node);
474 list_del(&evt->node);
475 kfree(evt);
476 }
477
478 blk_put_queue(sdev->request_queue);
479 /* NULL queue means the device can't be used */
480 sdev->request_queue = NULL;
481
482 sbitmap_free(&sdev->budget_map);
483
484 mutex_lock(&sdev->inquiry_mutex);
485 vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
486 lockdep_is_held(&sdev->inquiry_mutex));
487 vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
488 lockdep_is_held(&sdev->inquiry_mutex));
489 vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
490 lockdep_is_held(&sdev->inquiry_mutex));
491 vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
492 lockdep_is_held(&sdev->inquiry_mutex));
493 vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
494 lockdep_is_held(&sdev->inquiry_mutex));
495 vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
496 lockdep_is_held(&sdev->inquiry_mutex));
497 vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
498 lockdep_is_held(&sdev->inquiry_mutex));
499 vpd_pgb7 = rcu_replace_pointer(sdev->vpd_pgb7, vpd_pgb7,
500 lockdep_is_held(&sdev->inquiry_mutex));
501 mutex_unlock(&sdev->inquiry_mutex);
502
503 if (vpd_pg0)
504 kfree_rcu(vpd_pg0, rcu);
505 if (vpd_pg83)
506 kfree_rcu(vpd_pg83, rcu);
507 if (vpd_pg80)
508 kfree_rcu(vpd_pg80, rcu);
509 if (vpd_pg89)
510 kfree_rcu(vpd_pg89, rcu);
511 if (vpd_pgb0)
512 kfree_rcu(vpd_pgb0, rcu);
513 if (vpd_pgb1)
514 kfree_rcu(vpd_pgb1, rcu);
515 if (vpd_pgb2)
516 kfree_rcu(vpd_pgb2, rcu);
517 if (vpd_pgb7)
518 kfree_rcu(vpd_pgb7, rcu);
519 kfree(sdev->inquiry);
520 kfree(sdev);
521
522 if (parent)
523 put_device(parent);
524}
525
526static struct class sdev_class = {
527 .name = "scsi_device",
528 .dev_release = scsi_device_cls_release,
529};
530
531/* all probing is done in the individual ->probe routines */
532static int scsi_bus_match(struct device *dev, const struct device_driver *gendrv)
533{
534 struct scsi_device *sdp;
535
536 if (dev->type != &scsi_dev_type)
537 return 0;
538
539 sdp = to_scsi_device(dev);
540 if (sdp->no_uld_attach)
541 return 0;
542 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
543}
544
545static int scsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
546{
547 const struct scsi_device *sdev;
548
549 if (dev->type != &scsi_dev_type)
550 return 0;
551
552 sdev = to_scsi_device(dev);
553
554 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
555 return 0;
556}
557
558static int scsi_bus_probe(struct device *dev)
559{
560 struct scsi_device *sdp = to_scsi_device(dev);
561 struct scsi_driver *drv = to_scsi_driver(dev->driver);
562
563 if (drv->probe)
564 return drv->probe(sdp);
565 else
566 return 0;
567}
568
569static void scsi_bus_remove(struct device *dev)
570{
571 struct scsi_device *sdp = to_scsi_device(dev);
572 struct scsi_driver *drv = to_scsi_driver(dev->driver);
573
574 if (drv->remove)
575 drv->remove(sdp);
576}
577
578static void scsi_bus_shutdown(struct device *dev)
579{
580 struct scsi_device *sdp = to_scsi_device(dev);
581 struct scsi_driver *drv;
582
583 if (!dev->driver)
584 return;
585
586 drv = to_scsi_driver(dev->driver);
587
588 if (drv->shutdown)
589 drv->shutdown(sdp);
590}
591
592
593const struct bus_type scsi_bus_type = {
594 .name = "scsi",
595 .match = scsi_bus_match,
596 .uevent = scsi_bus_uevent,
597 .probe = scsi_bus_probe,
598 .remove = scsi_bus_remove,
599 .shutdown = scsi_bus_shutdown,
600#ifdef CONFIG_PM
601 .pm = &scsi_bus_pm_ops,
602#endif
603};
604
605int scsi_sysfs_register(void)
606{
607 int error;
608
609 error = bus_register(&scsi_bus_type);
610 if (!error) {
611 error = class_register(&sdev_class);
612 if (error)
613 bus_unregister(&scsi_bus_type);
614 }
615
616 return error;
617}
618
619void scsi_sysfs_unregister(void)
620{
621 class_unregister(&sdev_class);
622 bus_unregister(&scsi_bus_type);
623}
624
625/*
626 * sdev_show_function: macro to create an attr function that can be used to
627 * show a non-bit field.
628 */
629#define sdev_show_function(field, format_string) \
630static ssize_t \
631sdev_show_##field (struct device *dev, struct device_attribute *attr, \
632 char *buf) \
633{ \
634 struct scsi_device *sdev; \
635 sdev = to_scsi_device(dev); \
636 return snprintf (buf, 20, format_string, sdev->field); \
637} \
638
639/*
640 * sdev_rd_attr: macro to create a function and attribute variable for a
641 * read only field.
642 */
643#define sdev_rd_attr(field, format_string) \
644 sdev_show_function(field, format_string) \
645static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
646
647/*
648 * Create the actual show/store functions and data structures.
649 */
650sdev_rd_attr (type, "%d\n");
651sdev_rd_attr (scsi_level, "%d\n");
652sdev_rd_attr (vendor, "%.8s\n");
653sdev_rd_attr (model, "%.16s\n");
654sdev_rd_attr (rev, "%.4s\n");
655sdev_rd_attr (cdl_supported, "%d\n");
656
657static ssize_t
658sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
659 char *buf)
660{
661 struct scsi_device *sdev = to_scsi_device(dev);
662 return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
663}
664static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
665
666static ssize_t
667sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
668 char *buf)
669{
670 struct scsi_device *sdev = to_scsi_device(dev);
671 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
672}
673static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
674
675/*
676 * TODO: can we make these symlinks to the block layer ones?
677 */
678static ssize_t
679sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
680{
681 struct scsi_device *sdev;
682 sdev = to_scsi_device(dev);
683 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
684}
685
686static ssize_t
687sdev_store_timeout (struct device *dev, struct device_attribute *attr,
688 const char *buf, size_t count)
689{
690 struct scsi_device *sdev = to_scsi_device(dev);
691 int ret, timeout;
692
693 ret = kstrtoint(buf, 0, &timeout);
694 if (ret)
695 return ret;
696 if (timeout <= 0)
697 return -EINVAL;
698 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
699 return count;
700}
701static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
702
703static ssize_t
704sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
705{
706 struct scsi_device *sdev;
707 sdev = to_scsi_device(dev);
708 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
709}
710
711static ssize_t
712sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
713 const char *buf, size_t count)
714{
715 struct scsi_device *sdev;
716 unsigned int eh_timeout;
717 int err;
718
719 if (!capable(CAP_SYS_ADMIN))
720 return -EACCES;
721
722 sdev = to_scsi_device(dev);
723 err = kstrtouint(buf, 10, &eh_timeout);
724 if (err)
725 return err;
726 sdev->eh_timeout = eh_timeout * HZ;
727
728 return count;
729}
730static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
731
732static ssize_t
733store_rescan_field (struct device *dev, struct device_attribute *attr,
734 const char *buf, size_t count)
735{
736 scsi_rescan_device(to_scsi_device(dev));
737 return count;
738}
739static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
740
741static ssize_t
742sdev_store_delete(struct device *dev, struct device_attribute *attr,
743 const char *buf, size_t count)
744{
745 struct kernfs_node *kn;
746 struct scsi_device *sdev = to_scsi_device(dev);
747
748 /*
749 * We need to try to get module, avoiding the module been removed
750 * during delete.
751 */
752 if (scsi_device_get(sdev))
753 return -ENODEV;
754
755 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
756 WARN_ON_ONCE(!kn);
757 /*
758 * Concurrent writes into the "delete" sysfs attribute may trigger
759 * concurrent calls to device_remove_file() and scsi_remove_device().
760 * device_remove_file() handles concurrent removal calls by
761 * serializing these and by ignoring the second and later removal
762 * attempts. Concurrent calls of scsi_remove_device() are
763 * serialized. The second and later calls of scsi_remove_device() are
764 * ignored because the first call of that function changes the device
765 * state into SDEV_DEL.
766 */
767 device_remove_file(dev, attr);
768 scsi_remove_device(sdev);
769 if (kn)
770 sysfs_unbreak_active_protection(kn);
771 scsi_device_put(sdev);
772 return count;
773};
774static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
775
776static ssize_t
777store_state_field(struct device *dev, struct device_attribute *attr,
778 const char *buf, size_t count)
779{
780 int i, ret;
781 struct scsi_device *sdev = to_scsi_device(dev);
782 enum scsi_device_state state = 0;
783 bool rescan_dev = false;
784
785 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
786 const int len = strlen(sdev_states[i].name);
787 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
788 buf[len] == '\n') {
789 state = sdev_states[i].value;
790 break;
791 }
792 }
793 switch (state) {
794 case SDEV_RUNNING:
795 case SDEV_OFFLINE:
796 break;
797 default:
798 return -EINVAL;
799 }
800
801 mutex_lock(&sdev->state_mutex);
802 switch (sdev->sdev_state) {
803 case SDEV_RUNNING:
804 case SDEV_OFFLINE:
805 break;
806 default:
807 mutex_unlock(&sdev->state_mutex);
808 return -EINVAL;
809 }
810 if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
811 ret = 0;
812 } else {
813 ret = scsi_device_set_state(sdev, state);
814 if (ret == 0 && state == SDEV_RUNNING)
815 rescan_dev = true;
816 }
817 mutex_unlock(&sdev->state_mutex);
818
819 if (rescan_dev) {
820 /*
821 * If the device state changes to SDEV_RUNNING, we need to
822 * run the queue to avoid I/O hang, and rescan the device
823 * to revalidate it. Running the queue first is necessary
824 * because another thread may be waiting inside
825 * blk_mq_freeze_queue_wait() and because that call may be
826 * waiting for pending I/O to finish.
827 */
828 blk_mq_run_hw_queues(sdev->request_queue, true);
829 scsi_rescan_device(sdev);
830 }
831
832 return ret == 0 ? count : -EINVAL;
833}
834
835static ssize_t
836show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
837{
838 struct scsi_device *sdev = to_scsi_device(dev);
839 const char *name = scsi_device_state_name(sdev->sdev_state);
840
841 if (!name)
842 return -EINVAL;
843
844 return snprintf(buf, 20, "%s\n", name);
845}
846
847static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
848
849static ssize_t
850show_queue_type_field(struct device *dev, struct device_attribute *attr,
851 char *buf)
852{
853 struct scsi_device *sdev = to_scsi_device(dev);
854 const char *name = "none";
855
856 if (sdev->simple_tags)
857 name = "simple";
858
859 return snprintf(buf, 20, "%s\n", name);
860}
861
862static ssize_t
863store_queue_type_field(struct device *dev, struct device_attribute *attr,
864 const char *buf, size_t count)
865{
866 struct scsi_device *sdev = to_scsi_device(dev);
867
868 if (!sdev->tagged_supported)
869 return -EINVAL;
870
871 sdev_printk(KERN_INFO, sdev,
872 "ignoring write to deprecated queue_type attribute");
873 return count;
874}
875
876static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
877 store_queue_type_field);
878
879#define sdev_vpd_pg_attr(_page) \
880static ssize_t \
881show_vpd_##_page(struct file *filp, struct kobject *kobj, \
882 const struct bin_attribute *bin_attr, \
883 char *buf, loff_t off, size_t count) \
884{ \
885 struct device *dev = kobj_to_dev(kobj); \
886 struct scsi_device *sdev = to_scsi_device(dev); \
887 struct scsi_vpd *vpd_page; \
888 int ret = -EINVAL; \
889 \
890 rcu_read_lock(); \
891 vpd_page = rcu_dereference(sdev->vpd_##_page); \
892 if (vpd_page) \
893 ret = memory_read_from_buffer(buf, count, &off, \
894 vpd_page->data, vpd_page->len); \
895 rcu_read_unlock(); \
896 return ret; \
897} \
898static const struct bin_attribute dev_attr_vpd_##_page = { \
899 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
900 .size = 0, \
901 .read = show_vpd_##_page, \
902};
903
904sdev_vpd_pg_attr(pg83);
905sdev_vpd_pg_attr(pg80);
906sdev_vpd_pg_attr(pg89);
907sdev_vpd_pg_attr(pgb0);
908sdev_vpd_pg_attr(pgb1);
909sdev_vpd_pg_attr(pgb2);
910sdev_vpd_pg_attr(pgb7);
911sdev_vpd_pg_attr(pg0);
912
913static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
914 const struct bin_attribute *bin_attr,
915 char *buf, loff_t off, size_t count)
916{
917 struct device *dev = kobj_to_dev(kobj);
918 struct scsi_device *sdev = to_scsi_device(dev);
919
920 if (!sdev->inquiry)
921 return -EINVAL;
922
923 return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
924 sdev->inquiry_len);
925}
926
927static const struct bin_attribute dev_attr_inquiry = {
928 .attr = {
929 .name = "inquiry",
930 .mode = S_IRUGO,
931 },
932 .size = 0,
933 .read = show_inquiry,
934};
935
936static ssize_t
937show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
938 char *buf)
939{
940 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
941}
942
943static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
944
945#define show_sdev_iostat(field) \
946static ssize_t \
947show_iostat_##field(struct device *dev, struct device_attribute *attr, \
948 char *buf) \
949{ \
950 struct scsi_device *sdev = to_scsi_device(dev); \
951 unsigned long long count = atomic_read(&sdev->field); \
952 return snprintf(buf, 20, "0x%llx\n", count); \
953} \
954static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
955
956show_sdev_iostat(iorequest_cnt);
957show_sdev_iostat(iodone_cnt);
958show_sdev_iostat(ioerr_cnt);
959show_sdev_iostat(iotmo_cnt);
960
961static ssize_t
962sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
963{
964 struct scsi_device *sdev;
965 sdev = to_scsi_device(dev);
966 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
967}
968static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
969
970#define DECLARE_EVT_SHOW(name, Cap_name) \
971static ssize_t \
972sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
973 char *buf) \
974{ \
975 struct scsi_device *sdev = to_scsi_device(dev); \
976 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
977 return snprintf(buf, 20, "%d\n", val); \
978}
979
980#define DECLARE_EVT_STORE(name, Cap_name) \
981static ssize_t \
982sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
983 const char *buf, size_t count) \
984{ \
985 struct scsi_device *sdev = to_scsi_device(dev); \
986 int val = simple_strtoul(buf, NULL, 0); \
987 if (val == 0) \
988 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
989 else if (val == 1) \
990 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
991 else \
992 return -EINVAL; \
993 return count; \
994}
995
996#define DECLARE_EVT(name, Cap_name) \
997 DECLARE_EVT_SHOW(name, Cap_name) \
998 DECLARE_EVT_STORE(name, Cap_name) \
999 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
1000 sdev_store_evt_##name);
1001#define REF_EVT(name) &dev_attr_evt_##name.attr
1002
1003DECLARE_EVT(media_change, MEDIA_CHANGE)
1004DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1005DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1006DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1007DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1008DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1009
1010static ssize_t
1011sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1012 const char *buf, size_t count)
1013{
1014 int depth, retval;
1015 struct scsi_device *sdev = to_scsi_device(dev);
1016 const struct scsi_host_template *sht = sdev->host->hostt;
1017
1018 if (!sht->change_queue_depth)
1019 return -EINVAL;
1020
1021 depth = simple_strtoul(buf, NULL, 0);
1022
1023 if (depth < 1 || depth > sdev->host->can_queue)
1024 return -EINVAL;
1025
1026 retval = sht->change_queue_depth(sdev, depth);
1027 if (retval < 0)
1028 return retval;
1029
1030 sdev->max_queue_depth = sdev->queue_depth;
1031
1032 return count;
1033}
1034sdev_show_function(queue_depth, "%d\n");
1035
1036static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1037 sdev_store_queue_depth);
1038
1039static ssize_t
1040sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1041 char *buf)
1042{
1043 struct scsi_device *sdev = to_scsi_device(dev);
1044 ssize_t count;
1045
1046 count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1047 if (count > 0) {
1048 buf[count] = '\n';
1049 count++;
1050 }
1051 return count;
1052}
1053static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1054
1055static ssize_t
1056sdev_show_serial(struct device *dev, struct device_attribute *attr, char *buf)
1057{
1058 struct scsi_device *sdev = to_scsi_device(dev);
1059 ssize_t ret;
1060
1061 ret = scsi_vpd_lun_serial(sdev, buf, PAGE_SIZE - 1);
1062 if (ret < 0)
1063 return ret;
1064
1065 buf[ret] = '\n';
1066 return ret + 1;
1067}
1068static DEVICE_ATTR(serial, S_IRUGO, sdev_show_serial, NULL);
1069
1070#define BLIST_FLAG_NAME(name) \
1071 [const_ilog2((__force __u64)BLIST_##name)] = #name
1072static const char *const sdev_bflags_name[] = {
1073#include "scsi_devinfo_tbl.c"
1074};
1075#undef BLIST_FLAG_NAME
1076
1077static ssize_t
1078sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1079 char *buf)
1080{
1081 struct scsi_device *sdev = to_scsi_device(dev);
1082 int i;
1083 ssize_t len = 0;
1084
1085 for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1086 const char *name = NULL;
1087
1088 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1089 continue;
1090 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1091 name = sdev_bflags_name[i];
1092
1093 if (name)
1094 len += scnprintf(buf + len, PAGE_SIZE - len,
1095 "%s%s", len ? " " : "", name);
1096 else
1097 len += scnprintf(buf + len, PAGE_SIZE - len,
1098 "%sINVALID_BIT(%d)", len ? " " : "", i);
1099 }
1100 if (len)
1101 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1102 return len;
1103}
1104static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1105
1106#ifdef CONFIG_SCSI_DH
1107static ssize_t
1108sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1109 char *buf)
1110{
1111 struct scsi_device *sdev = to_scsi_device(dev);
1112
1113 if (!sdev->handler)
1114 return snprintf(buf, 20, "detached\n");
1115
1116 return snprintf(buf, 20, "%s\n", sdev->handler->name);
1117}
1118
1119static ssize_t
1120sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1121 const char *buf, size_t count)
1122{
1123 struct scsi_device *sdev = to_scsi_device(dev);
1124 int err = -EINVAL;
1125
1126 if (sdev->sdev_state == SDEV_CANCEL ||
1127 sdev->sdev_state == SDEV_DEL)
1128 return -ENODEV;
1129
1130 if (!sdev->handler) {
1131 /*
1132 * Attach to a device handler
1133 */
1134 err = scsi_dh_attach(sdev->request_queue, buf);
1135 } else if (!strncmp(buf, "activate", 8)) {
1136 /*
1137 * Activate a device handler
1138 */
1139 if (sdev->handler->activate)
1140 err = sdev->handler->activate(sdev, NULL, NULL);
1141 else
1142 err = 0;
1143 } else if (!strncmp(buf, "detach", 6)) {
1144 /*
1145 * Detach from a device handler
1146 */
1147 sdev_printk(KERN_WARNING, sdev,
1148 "can't detach handler %s.\n",
1149 sdev->handler->name);
1150 err = -EINVAL;
1151 }
1152
1153 return err < 0 ? err : count;
1154}
1155
1156static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1157 sdev_store_dh_state);
1158
1159static ssize_t
1160sdev_show_access_state(struct device *dev,
1161 struct device_attribute *attr,
1162 char *buf)
1163{
1164 struct scsi_device *sdev = to_scsi_device(dev);
1165 unsigned char access_state;
1166 const char *access_state_name;
1167
1168 if (!sdev->handler)
1169 return -EINVAL;
1170
1171 access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1172 access_state_name = scsi_access_state_name(access_state);
1173
1174 return sprintf(buf, "%s\n",
1175 access_state_name ? access_state_name : "unknown");
1176}
1177static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1178
1179static ssize_t
1180sdev_show_preferred_path(struct device *dev,
1181 struct device_attribute *attr,
1182 char *buf)
1183{
1184 struct scsi_device *sdev = to_scsi_device(dev);
1185
1186 if (!sdev->handler)
1187 return -EINVAL;
1188
1189 if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1190 return sprintf(buf, "1\n");
1191 else
1192 return sprintf(buf, "0\n");
1193}
1194static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1195#endif
1196
1197static ssize_t
1198sdev_show_queue_ramp_up_period(struct device *dev,
1199 struct device_attribute *attr,
1200 char *buf)
1201{
1202 struct scsi_device *sdev;
1203 sdev = to_scsi_device(dev);
1204 return snprintf(buf, 20, "%u\n",
1205 jiffies_to_msecs(sdev->queue_ramp_up_period));
1206}
1207
1208static ssize_t
1209sdev_store_queue_ramp_up_period(struct device *dev,
1210 struct device_attribute *attr,
1211 const char *buf, size_t count)
1212{
1213 struct scsi_device *sdev = to_scsi_device(dev);
1214 unsigned int period;
1215
1216 if (kstrtouint(buf, 10, &period))
1217 return -EINVAL;
1218
1219 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1220 return count;
1221}
1222
1223static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1224 sdev_show_queue_ramp_up_period,
1225 sdev_store_queue_ramp_up_period);
1226
1227static ssize_t sdev_show_cdl_enable(struct device *dev,
1228 struct device_attribute *attr, char *buf)
1229{
1230 struct scsi_device *sdev = to_scsi_device(dev);
1231
1232 return sysfs_emit(buf, "%d\n", (int)sdev->cdl_enable);
1233}
1234
1235static ssize_t sdev_store_cdl_enable(struct device *dev,
1236 struct device_attribute *attr,
1237 const char *buf, size_t count)
1238{
1239 int ret;
1240 bool v;
1241
1242 if (kstrtobool(buf, &v))
1243 return -EINVAL;
1244
1245 ret = scsi_cdl_enable(to_scsi_device(dev), v);
1246 if (ret)
1247 return ret;
1248
1249 return count;
1250}
1251static DEVICE_ATTR(cdl_enable, S_IRUGO | S_IWUSR,
1252 sdev_show_cdl_enable, sdev_store_cdl_enable);
1253
1254static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1255 struct attribute *attr, int i)
1256{
1257 struct device *dev = kobj_to_dev(kobj);
1258 struct scsi_device *sdev = to_scsi_device(dev);
1259
1260
1261 if (attr == &dev_attr_queue_depth.attr &&
1262 !sdev->host->hostt->change_queue_depth)
1263 return S_IRUGO;
1264
1265 if (attr == &dev_attr_queue_ramp_up_period.attr &&
1266 !sdev->host->hostt->change_queue_depth)
1267 return 0;
1268
1269 return attr->mode;
1270}
1271
1272static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1273 const struct bin_attribute *attr, int i)
1274{
1275 struct device *dev = kobj_to_dev(kobj);
1276 struct scsi_device *sdev = to_scsi_device(dev);
1277
1278
1279 if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1280 return 0;
1281
1282 if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1283 return 0;
1284
1285 if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1286 return 0;
1287
1288 if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1289 return 0;
1290
1291 if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1292 return 0;
1293
1294 if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1295 return 0;
1296
1297 if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1298 return 0;
1299
1300 if (attr == &dev_attr_vpd_pgb7 && !sdev->vpd_pgb7)
1301 return 0;
1302
1303 return S_IRUGO;
1304}
1305
1306/* Default template for device attributes. May NOT be modified */
1307static struct attribute *scsi_sdev_attrs[] = {
1308 &dev_attr_device_blocked.attr,
1309 &dev_attr_type.attr,
1310 &dev_attr_scsi_level.attr,
1311 &dev_attr_device_busy.attr,
1312 &dev_attr_vendor.attr,
1313 &dev_attr_model.attr,
1314 &dev_attr_serial.attr,
1315 &dev_attr_rev.attr,
1316 &dev_attr_rescan.attr,
1317 &dev_attr_delete.attr,
1318 &dev_attr_state.attr,
1319 &dev_attr_timeout.attr,
1320 &dev_attr_eh_timeout.attr,
1321 &dev_attr_iocounterbits.attr,
1322 &dev_attr_iorequest_cnt.attr,
1323 &dev_attr_iodone_cnt.attr,
1324 &dev_attr_ioerr_cnt.attr,
1325 &dev_attr_iotmo_cnt.attr,
1326 &dev_attr_modalias.attr,
1327 &dev_attr_queue_depth.attr,
1328 &dev_attr_queue_type.attr,
1329 &dev_attr_wwid.attr,
1330 &dev_attr_blacklist.attr,
1331#ifdef CONFIG_SCSI_DH
1332 &dev_attr_dh_state.attr,
1333 &dev_attr_access_state.attr,
1334 &dev_attr_preferred_path.attr,
1335#endif
1336 &dev_attr_queue_ramp_up_period.attr,
1337 &dev_attr_cdl_supported.attr,
1338 &dev_attr_cdl_enable.attr,
1339 REF_EVT(media_change),
1340 REF_EVT(inquiry_change_reported),
1341 REF_EVT(capacity_change_reported),
1342 REF_EVT(soft_threshold_reached),
1343 REF_EVT(mode_parameter_change_reported),
1344 REF_EVT(lun_change_reported),
1345 NULL
1346};
1347
1348static const struct bin_attribute *const scsi_sdev_bin_attrs[] = {
1349 &dev_attr_vpd_pg0,
1350 &dev_attr_vpd_pg83,
1351 &dev_attr_vpd_pg80,
1352 &dev_attr_vpd_pg89,
1353 &dev_attr_vpd_pgb0,
1354 &dev_attr_vpd_pgb1,
1355 &dev_attr_vpd_pgb2,
1356 &dev_attr_vpd_pgb7,
1357 &dev_attr_inquiry,
1358 NULL
1359};
1360static struct attribute_group scsi_sdev_attr_group = {
1361 .attrs = scsi_sdev_attrs,
1362 .bin_attrs = scsi_sdev_bin_attrs,
1363 .is_visible = scsi_sdev_attr_is_visible,
1364 .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1365};
1366
1367static const struct attribute_group *scsi_sdev_attr_groups[] = {
1368 &scsi_sdev_attr_group,
1369 NULL
1370};
1371
1372static int scsi_target_add(struct scsi_target *starget)
1373{
1374 int error;
1375
1376 if (starget->state != STARGET_CREATED)
1377 return 0;
1378
1379 error = device_add(&starget->dev);
1380 if (error) {
1381 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1382 return error;
1383 }
1384 transport_add_device(&starget->dev);
1385 starget->state = STARGET_RUNNING;
1386
1387 pm_runtime_set_active(&starget->dev);
1388 pm_runtime_enable(&starget->dev);
1389 device_enable_async_suspend(&starget->dev);
1390
1391 return 0;
1392}
1393
1394/**
1395 * scsi_sysfs_add_sdev - add scsi device to sysfs
1396 * @sdev: scsi_device to add
1397 *
1398 * Return value:
1399 * 0 on Success / non-zero on Failure
1400 **/
1401int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1402{
1403 int error;
1404 struct scsi_target *starget = sdev->sdev_target;
1405
1406 if (WARN_ON_ONCE(scsi_device_is_pseudo_dev(sdev)))
1407 return -EINVAL;
1408
1409 error = scsi_target_add(starget);
1410 if (error)
1411 return error;
1412
1413 transport_configure_device(&starget->dev);
1414
1415 device_enable_async_suspend(&sdev->sdev_gendev);
1416 scsi_autopm_get_target(starget);
1417 pm_runtime_set_active(&sdev->sdev_gendev);
1418 if (!sdev->rpm_autosuspend)
1419 pm_runtime_forbid(&sdev->sdev_gendev);
1420 pm_runtime_enable(&sdev->sdev_gendev);
1421 scsi_autopm_put_target(starget);
1422
1423 scsi_autopm_get_device(sdev);
1424
1425 scsi_dh_add_device(sdev);
1426
1427 error = device_add(&sdev->sdev_gendev);
1428 if (error) {
1429 sdev_printk(KERN_INFO, sdev,
1430 "failed to add device: %d\n", error);
1431 return error;
1432 }
1433
1434 device_enable_async_suspend(&sdev->sdev_dev);
1435 error = device_add(&sdev->sdev_dev);
1436 if (error) {
1437 sdev_printk(KERN_INFO, sdev,
1438 "failed to add class device: %d\n", error);
1439 device_del(&sdev->sdev_gendev);
1440 return error;
1441 }
1442 transport_add_device(&sdev->sdev_gendev);
1443 sdev->is_visible = 1;
1444
1445 if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1446 sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1447 if (IS_ERR(sdev->bsg_dev)) {
1448 error = PTR_ERR(sdev->bsg_dev);
1449 sdev_printk(KERN_INFO, sdev,
1450 "Failed to register bsg queue, errno=%d\n",
1451 error);
1452 sdev->bsg_dev = NULL;
1453 }
1454 }
1455
1456 scsi_autopm_put_device(sdev);
1457 return error;
1458}
1459
1460void __scsi_remove_device(struct scsi_device *sdev)
1461{
1462 struct device *dev = &sdev->sdev_gendev;
1463 int res;
1464
1465 /*
1466 * This cleanup path is not reentrant and while it is impossible
1467 * to get a new reference with scsi_device_get() someone can still
1468 * hold a previously acquired one.
1469 */
1470 if (sdev->sdev_state == SDEV_DEL)
1471 return;
1472
1473 if (sdev->is_visible) {
1474 /*
1475 * If scsi_internal_target_block() is running concurrently,
1476 * wait until it has finished before changing the device state.
1477 */
1478 mutex_lock(&sdev->state_mutex);
1479 /*
1480 * If blocked, we go straight to DEL and restart the queue so
1481 * any commands issued during driver shutdown (like sync
1482 * cache) are errored immediately.
1483 */
1484 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1485 if (res != 0) {
1486 res = scsi_device_set_state(sdev, SDEV_DEL);
1487 if (res == 0)
1488 scsi_start_queue(sdev);
1489 }
1490 mutex_unlock(&sdev->state_mutex);
1491
1492 if (res != 0)
1493 return;
1494
1495 if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1496 bsg_unregister_queue(sdev->bsg_dev);
1497 device_unregister(&sdev->sdev_dev);
1498 transport_remove_device(dev);
1499 device_del(dev);
1500 } else
1501 put_device(&sdev->sdev_dev);
1502
1503 /*
1504 * Stop accepting new requests and wait until all queuecommand() and
1505 * scsi_run_queue() invocations have finished before tearing down the
1506 * device.
1507 */
1508 mutex_lock(&sdev->state_mutex);
1509 scsi_device_set_state(sdev, SDEV_DEL);
1510 mutex_unlock(&sdev->state_mutex);
1511
1512 blk_mq_destroy_queue(sdev->request_queue);
1513 kref_put(&sdev->host->tagset_refcnt, scsi_mq_free_tags);
1514 cancel_work_sync(&sdev->requeue_work);
1515
1516 if (!scsi_device_is_pseudo_dev(sdev) && sdev->host->hostt->sdev_destroy)
1517 sdev->host->hostt->sdev_destroy(sdev);
1518 transport_destroy_device(dev);
1519
1520 /*
1521 * Paired with the kref_get() in scsi_sysfs_initialize(). We have
1522 * removed sysfs visibility from the device, so make the target
1523 * invisible if this was the last device underneath it.
1524 */
1525 scsi_target_reap(scsi_target(sdev));
1526
1527 put_device(dev);
1528}
1529
1530/**
1531 * scsi_remove_device - unregister a device from the scsi bus
1532 * @sdev: scsi_device to unregister
1533 **/
1534void scsi_remove_device(struct scsi_device *sdev)
1535{
1536 struct Scsi_Host *shost = sdev->host;
1537
1538 mutex_lock(&shost->scan_mutex);
1539 __scsi_remove_device(sdev);
1540 mutex_unlock(&shost->scan_mutex);
1541}
1542EXPORT_SYMBOL(scsi_remove_device);
1543
1544static void __scsi_remove_target(struct scsi_target *starget)
1545{
1546 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1547 unsigned long flags;
1548 struct scsi_device *sdev;
1549
1550 spin_lock_irqsave(shost->host_lock, flags);
1551 restart:
1552 list_for_each_entry(sdev, &shost->__devices, siblings) {
1553 /*
1554 * We cannot call scsi_device_get() here, as
1555 * we might've been called from rmmod() causing
1556 * scsi_device_get() to fail the module_is_live()
1557 * check.
1558 */
1559 if (sdev->channel != starget->channel ||
1560 sdev->id != starget->id)
1561 continue;
1562 if (sdev->sdev_state == SDEV_DEL ||
1563 sdev->sdev_state == SDEV_CANCEL ||
1564 !get_device(&sdev->sdev_gendev))
1565 continue;
1566 spin_unlock_irqrestore(shost->host_lock, flags);
1567 scsi_remove_device(sdev);
1568 put_device(&sdev->sdev_gendev);
1569 spin_lock_irqsave(shost->host_lock, flags);
1570 goto restart;
1571 }
1572 spin_unlock_irqrestore(shost->host_lock, flags);
1573}
1574
1575/**
1576 * scsi_remove_target - try to remove a target and all its devices
1577 * @dev: generic starget or parent of generic stargets to be removed
1578 *
1579 * Note: This is slightly racy. It is possible that if the user
1580 * requests the addition of another device then the target won't be
1581 * removed.
1582 */
1583void scsi_remove_target(struct device *dev)
1584{
1585 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1586 struct scsi_target *starget;
1587 unsigned long flags;
1588
1589restart:
1590 spin_lock_irqsave(shost->host_lock, flags);
1591 list_for_each_entry(starget, &shost->__targets, siblings) {
1592 if (starget->state == STARGET_DEL ||
1593 starget->state == STARGET_REMOVE ||
1594 starget->state == STARGET_CREATED_REMOVE)
1595 continue;
1596 if (starget->dev.parent == dev || &starget->dev == dev) {
1597 kref_get(&starget->reap_ref);
1598 if (starget->state == STARGET_CREATED)
1599 starget->state = STARGET_CREATED_REMOVE;
1600 else
1601 starget->state = STARGET_REMOVE;
1602 spin_unlock_irqrestore(shost->host_lock, flags);
1603 __scsi_remove_target(starget);
1604 scsi_target_reap(starget);
1605 goto restart;
1606 }
1607 }
1608 spin_unlock_irqrestore(shost->host_lock, flags);
1609}
1610EXPORT_SYMBOL(scsi_remove_target);
1611
1612static int scsi_legacy_probe(struct scsi_device *sdp)
1613{
1614 struct device *dev = &sdp->sdev_gendev;
1615 struct device_driver *driver = dev->driver;
1616
1617 return driver->probe(dev);
1618}
1619
1620static void scsi_legacy_remove(struct scsi_device *sdp)
1621{
1622 struct device *dev = &sdp->sdev_gendev;
1623 struct device_driver *driver = dev->driver;
1624
1625 driver->remove(dev);
1626}
1627
1628static void scsi_legacy_shutdown(struct scsi_device *sdp)
1629{
1630 struct device *dev = &sdp->sdev_gendev;
1631 struct device_driver *driver = dev->driver;
1632
1633 driver->shutdown(dev);
1634}
1635
1636int __scsi_register_driver(struct scsi_driver *sdrv, struct module *owner)
1637{
1638 struct device_driver *drv = &sdrv->gendrv;
1639
1640 drv->bus = &scsi_bus_type;
1641 drv->owner = owner;
1642
1643 if (!sdrv->probe && drv->probe)
1644 sdrv->probe = scsi_legacy_probe;
1645 if (!sdrv->remove && drv->remove)
1646 sdrv->remove = scsi_legacy_remove;
1647 if (!sdrv->shutdown && drv->shutdown)
1648 sdrv->shutdown = scsi_legacy_shutdown;
1649
1650 return driver_register(drv);
1651}
1652EXPORT_SYMBOL(__scsi_register_driver);
1653
1654int scsi_register_interface(struct class_interface *intf)
1655{
1656 intf->class = &sdev_class;
1657
1658 return class_interface_register(intf);
1659}
1660EXPORT_SYMBOL(scsi_register_interface);
1661
1662/**
1663 * scsi_sysfs_add_host - add scsi host to subsystem
1664 * @shost: scsi host struct to add to subsystem
1665 **/
1666int scsi_sysfs_add_host(struct Scsi_Host *shost)
1667{
1668 transport_register_device(&shost->shost_gendev);
1669 transport_configure_device(&shost->shost_gendev);
1670 return 0;
1671}
1672
1673static const struct device_type scsi_dev_type = {
1674 .name = "scsi_device",
1675 .release = scsi_device_dev_release,
1676 .groups = scsi_sdev_attr_groups,
1677};
1678
1679void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1680{
1681 unsigned long flags;
1682 struct Scsi_Host *shost = sdev->host;
1683 const struct scsi_host_template *hostt = shost->hostt;
1684 struct scsi_target *starget = sdev->sdev_target;
1685
1686 device_initialize(&sdev->sdev_gendev);
1687 sdev->sdev_gendev.bus = &scsi_bus_type;
1688 sdev->sdev_gendev.type = &scsi_dev_type;
1689 scsi_enable_async_suspend(&sdev->sdev_gendev);
1690 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1691 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1692 sdev->sdev_gendev.groups = hostt->sdev_groups;
1693
1694 device_initialize(&sdev->sdev_dev);
1695 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1696 sdev->sdev_dev.class = &sdev_class;
1697 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1698 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1699 /*
1700 * Get a default scsi_level from the target (derived from sibling
1701 * devices). This is the best we can do for guessing how to set
1702 * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the
1703 * setting doesn't matter, because all the bits are zero anyway.
1704 * But it does matter for higher LUNs.
1705 */
1706 sdev->scsi_level = starget->scsi_level;
1707 if (sdev->scsi_level <= SCSI_2 &&
1708 sdev->scsi_level != SCSI_UNKNOWN &&
1709 !shost->no_scsi2_lun_in_cdb)
1710 sdev->lun_in_cdb = 1;
1711
1712 transport_setup_device(&sdev->sdev_gendev);
1713 spin_lock_irqsave(shost->host_lock, flags);
1714 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1715 list_add_tail(&sdev->siblings, &shost->__devices);
1716 spin_unlock_irqrestore(shost->host_lock, flags);
1717 /*
1718 * device can now only be removed via __scsi_remove_device() so hold
1719 * the target. Target will be held in CREATED state until something
1720 * beneath it becomes visible (in which case it moves to RUNNING)
1721 */
1722 kref_get(&starget->reap_ref);
1723}
1724
1725int scsi_is_sdev_device(const struct device *dev)
1726{
1727 return dev->type == &scsi_dev_type;
1728}
1729EXPORT_SYMBOL(scsi_is_sdev_device);
1730
1731/* A blank transport template that is used in drivers that don't
1732 * yet implement Transport Attributes */
1733struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };