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(val: &channel, src: s1))
143 return -EINVAL;
144 if (check_set(val: &id, src: s2))
145 return -EINVAL;
146 if (check_set(val: &lun, src: 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, str: 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 if (scsi_host_set_state(shost, state))
218 return -EINVAL;
219 return count;
220}
221
222static ssize_t
223show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
224{
225 struct Scsi_Host *shost = class_to_shost(dev);
226 const char *name = scsi_host_state_name(state: shost->shost_state);
227
228 if (!name)
229 return -EINVAL;
230
231 return snprintf(buf, size: 20, fmt: "%s\n", name);
232}
233
234/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
235static struct device_attribute dev_attr_hstate =
236 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
237
238static ssize_t
239show_shost_mode(unsigned int mode, char *buf)
240{
241 ssize_t len = 0;
242
243 if (mode & MODE_INITIATOR)
244 len = sprintf(buf, fmt: "%s", "Initiator");
245
246 if (mode & MODE_TARGET)
247 len += sprintf(buf: buf + len, fmt: "%s%s", len ? ", " : "", "Target");
248
249 len += sprintf(buf: buf + len, fmt: "\n");
250
251 return len;
252}
253
254static ssize_t
255show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
256 char *buf)
257{
258 struct Scsi_Host *shost = class_to_shost(dev);
259 unsigned int supported_mode = shost->hostt->supported_mode;
260
261 if (supported_mode == MODE_UNKNOWN)
262 /* by default this should be initiator */
263 supported_mode = MODE_INITIATOR;
264
265 return show_shost_mode(mode: supported_mode, buf);
266}
267
268static DEVICE_ATTR(supported_mode, S_IRUGO, show_shost_supported_mode, NULL);
269
270static ssize_t
271show_shost_active_mode(struct device *dev,
272 struct device_attribute *attr, char *buf)
273{
274 struct Scsi_Host *shost = class_to_shost(dev);
275
276 if (shost->active_mode == MODE_UNKNOWN)
277 return snprintf(buf, size: 20, fmt: "unknown\n");
278 else
279 return show_shost_mode(mode: shost->active_mode, buf);
280}
281
282static DEVICE_ATTR(active_mode, S_IRUGO, show_shost_active_mode, NULL);
283
284static int check_reset_type(const char *str)
285{
286 if (sysfs_streq(s1: str, s2: "adapter"))
287 return SCSI_ADAPTER_RESET;
288 else if (sysfs_streq(s1: str, s2: "firmware"))
289 return SCSI_FIRMWARE_RESET;
290 else
291 return 0;
292}
293
294static ssize_t
295store_host_reset(struct device *dev, struct device_attribute *attr,
296 const char *buf, size_t count)
297{
298 struct Scsi_Host *shost = class_to_shost(dev);
299 const struct scsi_host_template *sht = shost->hostt;
300 int ret = -EINVAL;
301 int type;
302
303 type = check_reset_type(str: buf);
304 if (!type)
305 goto exit_store_host_reset;
306
307 if (sht->host_reset)
308 ret = sht->host_reset(shost, type);
309 else
310 ret = -EOPNOTSUPP;
311
312exit_store_host_reset:
313 if (ret == 0)
314 ret = count;
315 return ret;
316}
317
318static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
319
320static ssize_t
321show_shost_eh_deadline(struct device *dev,
322 struct device_attribute *attr, char *buf)
323{
324 struct Scsi_Host *shost = class_to_shost(dev);
325
326 if (shost->eh_deadline == -1)
327 return snprintf(buf, size: strlen("off") + 2, fmt: "off\n");
328 return sprintf(buf, fmt: "%u\n", shost->eh_deadline / HZ);
329}
330
331static ssize_t
332store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
333 const char *buf, size_t count)
334{
335 struct Scsi_Host *shost = class_to_shost(dev);
336 int ret = -EINVAL;
337 unsigned long deadline, flags;
338
339 if (shost->transportt &&
340 (shost->transportt->eh_strategy_handler ||
341 !shost->hostt->eh_host_reset_handler))
342 return ret;
343
344 if (!strncmp(buf, "off", strlen("off")))
345 deadline = -1;
346 else {
347 ret = kstrtoul(s: buf, base: 10, res: &deadline);
348 if (ret)
349 return ret;
350 if (deadline * HZ > UINT_MAX)
351 return -EINVAL;
352 }
353
354 spin_lock_irqsave(shost->host_lock, flags);
355 if (scsi_host_in_recovery(shost))
356 ret = -EBUSY;
357 else {
358 if (deadline == -1)
359 shost->eh_deadline = -1;
360 else
361 shost->eh_deadline = deadline * HZ;
362
363 ret = count;
364 }
365 spin_unlock_irqrestore(lock: shost->host_lock, flags);
366
367 return ret;
368}
369
370static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
371
372shost_rd_attr(unique_id, "%u\n");
373shost_rd_attr(cmd_per_lun, "%hd\n");
374shost_rd_attr(can_queue, "%d\n");
375shost_rd_attr(sg_tablesize, "%hu\n");
376shost_rd_attr(sg_prot_tablesize, "%hu\n");
377shost_rd_attr(prot_capabilities, "%u\n");
378shost_rd_attr(prot_guard_type, "%hd\n");
379shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
380
381static ssize_t
382show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
383{
384 struct Scsi_Host *shost = class_to_shost(dev);
385 return snprintf(buf, size: 20, fmt: "%d\n", scsi_host_busy(shost));
386}
387static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
388
389static ssize_t
390show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
391{
392 return sprintf(buf, fmt: "1\n");
393}
394static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
395
396static ssize_t
397show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf)
398{
399 struct Scsi_Host *shost = class_to_shost(dev);
400 struct blk_mq_tag_set *tag_set = &shost->tag_set;
401
402 return snprintf(buf, size: 20, fmt: "%d\n", tag_set->nr_hw_queues);
403}
404static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL);
405
406static struct attribute *scsi_sysfs_shost_attrs[] = {
407 &dev_attr_use_blk_mq.attr,
408 &dev_attr_unique_id.attr,
409 &dev_attr_host_busy.attr,
410 &dev_attr_cmd_per_lun.attr,
411 &dev_attr_can_queue.attr,
412 &dev_attr_sg_tablesize.attr,
413 &dev_attr_sg_prot_tablesize.attr,
414 &dev_attr_proc_name.attr,
415 &dev_attr_scan.attr,
416 &dev_attr_hstate.attr,
417 &dev_attr_supported_mode.attr,
418 &dev_attr_active_mode.attr,
419 &dev_attr_prot_capabilities.attr,
420 &dev_attr_prot_guard_type.attr,
421 &dev_attr_host_reset.attr,
422 &dev_attr_eh_deadline.attr,
423 &dev_attr_nr_hw_queues.attr,
424 NULL
425};
426
427static const struct attribute_group scsi_shost_attr_group = {
428 .attrs = scsi_sysfs_shost_attrs,
429};
430
431const struct attribute_group *scsi_shost_groups[] = {
432 &scsi_shost_attr_group,
433 NULL
434};
435
436static void scsi_device_cls_release(struct device *class_dev)
437{
438 struct scsi_device *sdev;
439
440 sdev = class_to_sdev(class_dev);
441 put_device(dev: &sdev->sdev_gendev);
442}
443
444static void scsi_device_dev_release(struct device *dev)
445{
446 struct scsi_device *sdev = to_scsi_device(dev);
447 struct device *parent;
448 struct list_head *this, *tmp;
449 struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
450 struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
451 struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = NULL;
452 struct scsi_vpd *vpd_pgb7 = NULL;
453 unsigned long flags;
454
455 might_sleep();
456
457 scsi_dh_release_device(sdev);
458
459 parent = sdev->sdev_gendev.parent;
460
461 spin_lock_irqsave(sdev->host->host_lock, flags);
462 list_del(entry: &sdev->siblings);
463 list_del(entry: &sdev->same_target_siblings);
464 list_del(entry: &sdev->starved_entry);
465 spin_unlock_irqrestore(lock: sdev->host->host_lock, flags);
466
467 cancel_work_sync(work: &sdev->event_work);
468
469 list_for_each_safe(this, tmp, &sdev->event_list) {
470 struct scsi_event *evt;
471
472 evt = list_entry(this, struct scsi_event, node);
473 list_del(entry: &evt->node);
474 kfree(objp: evt);
475 }
476
477 blk_put_queue(sdev->request_queue);
478 /* NULL queue means the device can't be used */
479 sdev->request_queue = NULL;
480
481 sbitmap_free(sb: &sdev->budget_map);
482
483 mutex_lock(lock: &sdev->inquiry_mutex);
484 vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
485 lockdep_is_held(&sdev->inquiry_mutex));
486 vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
487 lockdep_is_held(&sdev->inquiry_mutex));
488 vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
489 lockdep_is_held(&sdev->inquiry_mutex));
490 vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
491 lockdep_is_held(&sdev->inquiry_mutex));
492 vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
493 lockdep_is_held(&sdev->inquiry_mutex));
494 vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
495 lockdep_is_held(&sdev->inquiry_mutex));
496 vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
497 lockdep_is_held(&sdev->inquiry_mutex));
498 vpd_pgb7 = rcu_replace_pointer(sdev->vpd_pgb7, vpd_pgb7,
499 lockdep_is_held(&sdev->inquiry_mutex));
500 mutex_unlock(lock: &sdev->inquiry_mutex);
501
502 if (vpd_pg0)
503 kfree_rcu(vpd_pg0, rcu);
504 if (vpd_pg83)
505 kfree_rcu(vpd_pg83, rcu);
506 if (vpd_pg80)
507 kfree_rcu(vpd_pg80, rcu);
508 if (vpd_pg89)
509 kfree_rcu(vpd_pg89, rcu);
510 if (vpd_pgb0)
511 kfree_rcu(vpd_pgb0, rcu);
512 if (vpd_pgb1)
513 kfree_rcu(vpd_pgb1, rcu);
514 if (vpd_pgb2)
515 kfree_rcu(vpd_pgb2, rcu);
516 if (vpd_pgb7)
517 kfree_rcu(vpd_pgb7, rcu);
518 kfree(objp: sdev->inquiry);
519 kfree(objp: sdev);
520
521 if (parent)
522 put_device(dev: parent);
523}
524
525static struct class sdev_class = {
526 .name = "scsi_device",
527 .dev_release = scsi_device_cls_release,
528};
529
530/* all probing is done in the individual ->probe routines */
531static int scsi_bus_match(struct device *dev, const struct device_driver *gendrv)
532{
533 struct scsi_device *sdp;
534
535 if (dev->type != &scsi_dev_type)
536 return 0;
537
538 sdp = to_scsi_device(dev);
539 if (sdp->no_uld_attach)
540 return 0;
541 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
542}
543
544static int scsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
545{
546 const struct scsi_device *sdev;
547
548 if (dev->type != &scsi_dev_type)
549 return 0;
550
551 sdev = to_scsi_device(dev);
552
553 add_uevent_var(env, format: "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
554 return 0;
555}
556
557const struct bus_type scsi_bus_type = {
558 .name = "scsi",
559 .match = scsi_bus_match,
560 .uevent = scsi_bus_uevent,
561#ifdef CONFIG_PM
562 .pm = &scsi_bus_pm_ops,
563#endif
564};
565
566int scsi_sysfs_register(void)
567{
568 int error;
569
570 error = bus_register(bus: &scsi_bus_type);
571 if (!error) {
572 error = class_register(class: &sdev_class);
573 if (error)
574 bus_unregister(bus: &scsi_bus_type);
575 }
576
577 return error;
578}
579
580void scsi_sysfs_unregister(void)
581{
582 class_unregister(class: &sdev_class);
583 bus_unregister(bus: &scsi_bus_type);
584}
585
586/*
587 * sdev_show_function: macro to create an attr function that can be used to
588 * show a non-bit field.
589 */
590#define sdev_show_function(field, format_string) \
591static ssize_t \
592sdev_show_##field (struct device *dev, struct device_attribute *attr, \
593 char *buf) \
594{ \
595 struct scsi_device *sdev; \
596 sdev = to_scsi_device(dev); \
597 return snprintf (buf, 20, format_string, sdev->field); \
598} \
599
600/*
601 * sdev_rd_attr: macro to create a function and attribute variable for a
602 * read only field.
603 */
604#define sdev_rd_attr(field, format_string) \
605 sdev_show_function(field, format_string) \
606static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
607
608
609/*
610 * sdev_rw_attr: create a function and attribute variable for a
611 * read/write field.
612 */
613#define sdev_rw_attr(field, format_string) \
614 sdev_show_function(field, format_string) \
615 \
616static ssize_t \
617sdev_store_##field (struct device *dev, struct device_attribute *attr, \
618 const char *buf, size_t count) \
619{ \
620 struct scsi_device *sdev; \
621 sdev = to_scsi_device(dev); \
622 sscanf (buf, format_string, &sdev->field); \
623 return count; \
624} \
625static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
626
627/* Currently we don't export bit fields, but we might in future,
628 * so leave this code in */
629#if 0
630/*
631 * sdev_rd_attr: create a function and attribute variable for a
632 * read/write bit field.
633 */
634#define sdev_rw_attr_bit(field) \
635 sdev_show_function(field, "%d\n") \
636 \
637static ssize_t \
638sdev_store_##field (struct device *dev, struct device_attribute *attr, \
639 const char *buf, size_t count) \
640{ \
641 int ret; \
642 struct scsi_device *sdev; \
643 ret = scsi_sdev_check_buf_bit(buf); \
644 if (ret >= 0) { \
645 sdev = to_scsi_device(dev); \
646 sdev->field = ret; \
647 ret = count; \
648 } \
649 return ret; \
650} \
651static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
652
653/*
654 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
655 * else return -EINVAL.
656 */
657static int scsi_sdev_check_buf_bit(const char *buf)
658{
659 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
660 if (buf[0] == '1')
661 return 1;
662 else if (buf[0] == '0')
663 return 0;
664 else
665 return -EINVAL;
666 } else
667 return -EINVAL;
668}
669#endif
670/*
671 * Create the actual show/store functions and data structures.
672 */
673sdev_rd_attr (type, "%d\n");
674sdev_rd_attr (scsi_level, "%d\n");
675sdev_rd_attr (vendor, "%.8s\n");
676sdev_rd_attr (model, "%.16s\n");
677sdev_rd_attr (rev, "%.4s\n");
678sdev_rd_attr (cdl_supported, "%d\n");
679
680static ssize_t
681sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
682 char *buf)
683{
684 struct scsi_device *sdev = to_scsi_device(dev);
685 return snprintf(buf, size: 20, fmt: "%d\n", scsi_device_busy(sdev));
686}
687static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
688
689static ssize_t
690sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
691 char *buf)
692{
693 struct scsi_device *sdev = to_scsi_device(dev);
694 return snprintf(buf, size: 20, fmt: "%d\n", atomic_read(v: &sdev->device_blocked));
695}
696static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
697
698/*
699 * TODO: can we make these symlinks to the block layer ones?
700 */
701static ssize_t
702sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
703{
704 struct scsi_device *sdev;
705 sdev = to_scsi_device(dev);
706 return snprintf(buf, size: 20, fmt: "%d\n", sdev->request_queue->rq_timeout / HZ);
707}
708
709static ssize_t
710sdev_store_timeout (struct device *dev, struct device_attribute *attr,
711 const char *buf, size_t count)
712{
713 struct scsi_device *sdev;
714 int timeout;
715 sdev = to_scsi_device(dev);
716 sscanf (buf, "%d\n", &timeout);
717 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
718 return count;
719}
720static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
721
722static ssize_t
723sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
724{
725 struct scsi_device *sdev;
726 sdev = to_scsi_device(dev);
727 return snprintf(buf, size: 20, fmt: "%u\n", sdev->eh_timeout / HZ);
728}
729
730static ssize_t
731sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
732 const char *buf, size_t count)
733{
734 struct scsi_device *sdev;
735 unsigned int eh_timeout;
736 int err;
737
738 if (!capable(CAP_SYS_ADMIN))
739 return -EACCES;
740
741 sdev = to_scsi_device(dev);
742 err = kstrtouint(s: buf, base: 10, res: &eh_timeout);
743 if (err)
744 return err;
745 sdev->eh_timeout = eh_timeout * HZ;
746
747 return count;
748}
749static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
750
751static ssize_t
752store_rescan_field (struct device *dev, struct device_attribute *attr,
753 const char *buf, size_t count)
754{
755 scsi_rescan_device(to_scsi_device(dev));
756 return count;
757}
758static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
759
760static ssize_t
761sdev_store_delete(struct device *dev, struct device_attribute *attr,
762 const char *buf, size_t count)
763{
764 struct kernfs_node *kn;
765 struct scsi_device *sdev = to_scsi_device(dev);
766
767 /*
768 * We need to try to get module, avoiding the module been removed
769 * during delete.
770 */
771 if (scsi_device_get(sdev))
772 return -ENODEV;
773
774 kn = sysfs_break_active_protection(kobj: &dev->kobj, attr: &attr->attr);
775 WARN_ON_ONCE(!kn);
776 /*
777 * Concurrent writes into the "delete" sysfs attribute may trigger
778 * concurrent calls to device_remove_file() and scsi_remove_device().
779 * device_remove_file() handles concurrent removal calls by
780 * serializing these and by ignoring the second and later removal
781 * attempts. Concurrent calls of scsi_remove_device() are
782 * serialized. The second and later calls of scsi_remove_device() are
783 * ignored because the first call of that function changes the device
784 * state into SDEV_DEL.
785 */
786 device_remove_file(dev, attr);
787 scsi_remove_device(sdev);
788 if (kn)
789 sysfs_unbreak_active_protection(kn);
790 scsi_device_put(sdev);
791 return count;
792};
793static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
794
795static ssize_t
796store_state_field(struct device *dev, struct device_attribute *attr,
797 const char *buf, size_t count)
798{
799 int i, ret;
800 struct scsi_device *sdev = to_scsi_device(dev);
801 enum scsi_device_state state = 0;
802 bool rescan_dev = false;
803
804 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
805 const int len = strlen(sdev_states[i].name);
806 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
807 buf[len] == '\n') {
808 state = sdev_states[i].value;
809 break;
810 }
811 }
812 switch (state) {
813 case SDEV_RUNNING:
814 case SDEV_OFFLINE:
815 break;
816 default:
817 return -EINVAL;
818 }
819
820 mutex_lock(lock: &sdev->state_mutex);
821 switch (sdev->sdev_state) {
822 case SDEV_RUNNING:
823 case SDEV_OFFLINE:
824 break;
825 default:
826 mutex_unlock(lock: &sdev->state_mutex);
827 return -EINVAL;
828 }
829 if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
830 ret = 0;
831 } else {
832 ret = scsi_device_set_state(sdev, state);
833 if (ret == 0 && state == SDEV_RUNNING)
834 rescan_dev = true;
835 }
836 mutex_unlock(lock: &sdev->state_mutex);
837
838 if (rescan_dev) {
839 /*
840 * If the device state changes to SDEV_RUNNING, we need to
841 * run the queue to avoid I/O hang, and rescan the device
842 * to revalidate it. Running the queue first is necessary
843 * because another thread may be waiting inside
844 * blk_mq_freeze_queue_wait() and because that call may be
845 * waiting for pending I/O to finish.
846 */
847 blk_mq_run_hw_queues(q: sdev->request_queue, async: true);
848 scsi_rescan_device(sdev);
849 }
850
851 return ret == 0 ? count : -EINVAL;
852}
853
854static ssize_t
855show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
856{
857 struct scsi_device *sdev = to_scsi_device(dev);
858 const char *name = scsi_device_state_name(state: sdev->sdev_state);
859
860 if (!name)
861 return -EINVAL;
862
863 return snprintf(buf, size: 20, fmt: "%s\n", name);
864}
865
866static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
867
868static ssize_t
869show_queue_type_field(struct device *dev, struct device_attribute *attr,
870 char *buf)
871{
872 struct scsi_device *sdev = to_scsi_device(dev);
873 const char *name = "none";
874
875 if (sdev->simple_tags)
876 name = "simple";
877
878 return snprintf(buf, size: 20, fmt: "%s\n", name);
879}
880
881static ssize_t
882store_queue_type_field(struct device *dev, struct device_attribute *attr,
883 const char *buf, size_t count)
884{
885 struct scsi_device *sdev = to_scsi_device(dev);
886
887 if (!sdev->tagged_supported)
888 return -EINVAL;
889
890 sdev_printk(KERN_INFO, sdev,
891 "ignoring write to deprecated queue_type attribute");
892 return count;
893}
894
895static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
896 store_queue_type_field);
897
898#define sdev_vpd_pg_attr(_page) \
899static ssize_t \
900show_vpd_##_page(struct file *filp, struct kobject *kobj, \
901 const struct bin_attribute *bin_attr, \
902 char *buf, loff_t off, size_t count) \
903{ \
904 struct device *dev = kobj_to_dev(kobj); \
905 struct scsi_device *sdev = to_scsi_device(dev); \
906 struct scsi_vpd *vpd_page; \
907 int ret = -EINVAL; \
908 \
909 rcu_read_lock(); \
910 vpd_page = rcu_dereference(sdev->vpd_##_page); \
911 if (vpd_page) \
912 ret = memory_read_from_buffer(buf, count, &off, \
913 vpd_page->data, vpd_page->len); \
914 rcu_read_unlock(); \
915 return ret; \
916} \
917static const struct bin_attribute dev_attr_vpd_##_page = { \
918 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
919 .size = 0, \
920 .read = show_vpd_##_page, \
921};
922
923sdev_vpd_pg_attr(pg83);
924sdev_vpd_pg_attr(pg80);
925sdev_vpd_pg_attr(pg89);
926sdev_vpd_pg_attr(pgb0);
927sdev_vpd_pg_attr(pgb1);
928sdev_vpd_pg_attr(pgb2);
929sdev_vpd_pg_attr(pgb7);
930sdev_vpd_pg_attr(pg0);
931
932static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
933 const struct bin_attribute *bin_attr,
934 char *buf, loff_t off, size_t count)
935{
936 struct device *dev = kobj_to_dev(kobj);
937 struct scsi_device *sdev = to_scsi_device(dev);
938
939 if (!sdev->inquiry)
940 return -EINVAL;
941
942 return memory_read_from_buffer(to: buf, count, ppos: &off, from: sdev->inquiry,
943 available: sdev->inquiry_len);
944}
945
946static const struct bin_attribute dev_attr_inquiry = {
947 .attr = {
948 .name = "inquiry",
949 .mode = S_IRUGO,
950 },
951 .size = 0,
952 .read = show_inquiry,
953};
954
955static ssize_t
956show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
957 char *buf)
958{
959 return snprintf(buf, size: 20, fmt: "%d\n", (int)sizeof(atomic_t) * 8);
960}
961
962static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
963
964#define show_sdev_iostat(field) \
965static ssize_t \
966show_iostat_##field(struct device *dev, struct device_attribute *attr, \
967 char *buf) \
968{ \
969 struct scsi_device *sdev = to_scsi_device(dev); \
970 unsigned long long count = atomic_read(&sdev->field); \
971 return snprintf(buf, 20, "0x%llx\n", count); \
972} \
973static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
974
975show_sdev_iostat(iorequest_cnt);
976show_sdev_iostat(iodone_cnt);
977show_sdev_iostat(ioerr_cnt);
978show_sdev_iostat(iotmo_cnt);
979
980static ssize_t
981sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
982{
983 struct scsi_device *sdev;
984 sdev = to_scsi_device(dev);
985 return snprintf (buf, size: 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
986}
987static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
988
989#define DECLARE_EVT_SHOW(name, Cap_name) \
990static ssize_t \
991sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
992 char *buf) \
993{ \
994 struct scsi_device *sdev = to_scsi_device(dev); \
995 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
996 return snprintf(buf, 20, "%d\n", val); \
997}
998
999#define DECLARE_EVT_STORE(name, Cap_name) \
1000static ssize_t \
1001sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
1002 const char *buf, size_t count) \
1003{ \
1004 struct scsi_device *sdev = to_scsi_device(dev); \
1005 int val = simple_strtoul(buf, NULL, 0); \
1006 if (val == 0) \
1007 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
1008 else if (val == 1) \
1009 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
1010 else \
1011 return -EINVAL; \
1012 return count; \
1013}
1014
1015#define DECLARE_EVT(name, Cap_name) \
1016 DECLARE_EVT_SHOW(name, Cap_name) \
1017 DECLARE_EVT_STORE(name, Cap_name) \
1018 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
1019 sdev_store_evt_##name);
1020#define REF_EVT(name) &dev_attr_evt_##name.attr
1021
1022DECLARE_EVT(media_change, MEDIA_CHANGE)
1023DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1024DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1025DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1026DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1027DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1028
1029static ssize_t
1030sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1031 const char *buf, size_t count)
1032{
1033 int depth, retval;
1034 struct scsi_device *sdev = to_scsi_device(dev);
1035 const struct scsi_host_template *sht = sdev->host->hostt;
1036
1037 if (!sht->change_queue_depth)
1038 return -EINVAL;
1039
1040 depth = simple_strtoul(buf, NULL, 0);
1041
1042 if (depth < 1 || depth > sdev->host->can_queue)
1043 return -EINVAL;
1044
1045 retval = sht->change_queue_depth(sdev, depth);
1046 if (retval < 0)
1047 return retval;
1048
1049 sdev->max_queue_depth = sdev->queue_depth;
1050
1051 return count;
1052}
1053sdev_show_function(queue_depth, "%d\n");
1054
1055static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1056 sdev_store_queue_depth);
1057
1058static ssize_t
1059sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1060 char *buf)
1061{
1062 struct scsi_device *sdev = to_scsi_device(dev);
1063 ssize_t count;
1064
1065 count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1066 if (count > 0) {
1067 buf[count] = '\n';
1068 count++;
1069 }
1070 return count;
1071}
1072static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1073
1074#define BLIST_FLAG_NAME(name) \
1075 [const_ilog2((__force __u64)BLIST_##name)] = #name
1076static const char *const sdev_bflags_name[] = {
1077#include "scsi_devinfo_tbl.c"
1078};
1079#undef BLIST_FLAG_NAME
1080
1081static ssize_t
1082sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1083 char *buf)
1084{
1085 struct scsi_device *sdev = to_scsi_device(dev);
1086 int i;
1087 ssize_t len = 0;
1088
1089 for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1090 const char *name = NULL;
1091
1092 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1093 continue;
1094 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1095 name = sdev_bflags_name[i];
1096
1097 if (name)
1098 len += scnprintf(buf: buf + len, PAGE_SIZE - len,
1099 fmt: "%s%s", len ? " " : "", name);
1100 else
1101 len += scnprintf(buf: buf + len, PAGE_SIZE - len,
1102 fmt: "%sINVALID_BIT(%d)", len ? " " : "", i);
1103 }
1104 if (len)
1105 len += scnprintf(buf: buf + len, PAGE_SIZE - len, fmt: "\n");
1106 return len;
1107}
1108static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1109
1110#ifdef CONFIG_SCSI_DH
1111static ssize_t
1112sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1113 char *buf)
1114{
1115 struct scsi_device *sdev = to_scsi_device(dev);
1116
1117 if (!sdev->handler)
1118 return snprintf(buf, 20, "detached\n");
1119
1120 return snprintf(buf, 20, "%s\n", sdev->handler->name);
1121}
1122
1123static ssize_t
1124sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1125 const char *buf, size_t count)
1126{
1127 struct scsi_device *sdev = to_scsi_device(dev);
1128 int err = -EINVAL;
1129
1130 if (sdev->sdev_state == SDEV_CANCEL ||
1131 sdev->sdev_state == SDEV_DEL)
1132 return -ENODEV;
1133
1134 if (!sdev->handler) {
1135 /*
1136 * Attach to a device handler
1137 */
1138 err = scsi_dh_attach(sdev->request_queue, buf);
1139 } else if (!strncmp(buf, "activate", 8)) {
1140 /*
1141 * Activate a device handler
1142 */
1143 if (sdev->handler->activate)
1144 err = sdev->handler->activate(sdev, NULL, NULL);
1145 else
1146 err = 0;
1147 } else if (!strncmp(buf, "detach", 6)) {
1148 /*
1149 * Detach from a device handler
1150 */
1151 sdev_printk(KERN_WARNING, sdev,
1152 "can't detach handler %s.\n",
1153 sdev->handler->name);
1154 err = -EINVAL;
1155 }
1156
1157 return err < 0 ? err : count;
1158}
1159
1160static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1161 sdev_store_dh_state);
1162
1163static ssize_t
1164sdev_show_access_state(struct device *dev,
1165 struct device_attribute *attr,
1166 char *buf)
1167{
1168 struct scsi_device *sdev = to_scsi_device(dev);
1169 unsigned char access_state;
1170 const char *access_state_name;
1171
1172 if (!sdev->handler)
1173 return -EINVAL;
1174
1175 access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1176 access_state_name = scsi_access_state_name(access_state);
1177
1178 return sprintf(buf, "%s\n",
1179 access_state_name ? access_state_name : "unknown");
1180}
1181static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1182
1183static ssize_t
1184sdev_show_preferred_path(struct device *dev,
1185 struct device_attribute *attr,
1186 char *buf)
1187{
1188 struct scsi_device *sdev = to_scsi_device(dev);
1189
1190 if (!sdev->handler)
1191 return -EINVAL;
1192
1193 if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1194 return sprintf(buf, "1\n");
1195 else
1196 return sprintf(buf, "0\n");
1197}
1198static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1199#endif
1200
1201static ssize_t
1202sdev_show_queue_ramp_up_period(struct device *dev,
1203 struct device_attribute *attr,
1204 char *buf)
1205{
1206 struct scsi_device *sdev;
1207 sdev = to_scsi_device(dev);
1208 return snprintf(buf, size: 20, fmt: "%u\n",
1209 jiffies_to_msecs(j: sdev->queue_ramp_up_period));
1210}
1211
1212static ssize_t
1213sdev_store_queue_ramp_up_period(struct device *dev,
1214 struct device_attribute *attr,
1215 const char *buf, size_t count)
1216{
1217 struct scsi_device *sdev = to_scsi_device(dev);
1218 unsigned int period;
1219
1220 if (kstrtouint(s: buf, base: 10, res: &period))
1221 return -EINVAL;
1222
1223 sdev->queue_ramp_up_period = msecs_to_jiffies(m: period);
1224 return count;
1225}
1226
1227static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1228 sdev_show_queue_ramp_up_period,
1229 sdev_store_queue_ramp_up_period);
1230
1231static ssize_t sdev_show_cdl_enable(struct device *dev,
1232 struct device_attribute *attr, char *buf)
1233{
1234 struct scsi_device *sdev = to_scsi_device(dev);
1235
1236 return sysfs_emit(buf, fmt: "%d\n", (int)sdev->cdl_enable);
1237}
1238
1239static ssize_t sdev_store_cdl_enable(struct device *dev,
1240 struct device_attribute *attr,
1241 const char *buf, size_t count)
1242{
1243 int ret;
1244 bool v;
1245
1246 if (kstrtobool(s: buf, res: &v))
1247 return -EINVAL;
1248
1249 ret = scsi_cdl_enable(to_scsi_device(dev), enable: v);
1250 if (ret)
1251 return ret;
1252
1253 return count;
1254}
1255static DEVICE_ATTR(cdl_enable, S_IRUGO | S_IWUSR,
1256 sdev_show_cdl_enable, sdev_store_cdl_enable);
1257
1258static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1259 struct attribute *attr, int i)
1260{
1261 struct device *dev = kobj_to_dev(kobj);
1262 struct scsi_device *sdev = to_scsi_device(dev);
1263
1264
1265 if (attr == &dev_attr_queue_depth.attr &&
1266 !sdev->host->hostt->change_queue_depth)
1267 return S_IRUGO;
1268
1269 if (attr == &dev_attr_queue_ramp_up_period.attr &&
1270 !sdev->host->hostt->change_queue_depth)
1271 return 0;
1272
1273 return attr->mode;
1274}
1275
1276static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1277 const struct bin_attribute *attr, int i)
1278{
1279 struct device *dev = kobj_to_dev(kobj);
1280 struct scsi_device *sdev = to_scsi_device(dev);
1281
1282
1283 if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1284 return 0;
1285
1286 if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1287 return 0;
1288
1289 if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1290 return 0;
1291
1292 if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1293 return 0;
1294
1295 if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1296 return 0;
1297
1298 if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1299 return 0;
1300
1301 if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1302 return 0;
1303
1304 if (attr == &dev_attr_vpd_pgb7 && !sdev->vpd_pgb7)
1305 return 0;
1306
1307 return S_IRUGO;
1308}
1309
1310/* Default template for device attributes. May NOT be modified */
1311static struct attribute *scsi_sdev_attrs[] = {
1312 &dev_attr_device_blocked.attr,
1313 &dev_attr_type.attr,
1314 &dev_attr_scsi_level.attr,
1315 &dev_attr_device_busy.attr,
1316 &dev_attr_vendor.attr,
1317 &dev_attr_model.attr,
1318 &dev_attr_rev.attr,
1319 &dev_attr_rescan.attr,
1320 &dev_attr_delete.attr,
1321 &dev_attr_state.attr,
1322 &dev_attr_timeout.attr,
1323 &dev_attr_eh_timeout.attr,
1324 &dev_attr_iocounterbits.attr,
1325 &dev_attr_iorequest_cnt.attr,
1326 &dev_attr_iodone_cnt.attr,
1327 &dev_attr_ioerr_cnt.attr,
1328 &dev_attr_iotmo_cnt.attr,
1329 &dev_attr_modalias.attr,
1330 &dev_attr_queue_depth.attr,
1331 &dev_attr_queue_type.attr,
1332 &dev_attr_wwid.attr,
1333 &dev_attr_blacklist.attr,
1334#ifdef CONFIG_SCSI_DH
1335 &dev_attr_dh_state.attr,
1336 &dev_attr_access_state.attr,
1337 &dev_attr_preferred_path.attr,
1338#endif
1339 &dev_attr_queue_ramp_up_period.attr,
1340 &dev_attr_cdl_supported.attr,
1341 &dev_attr_cdl_enable.attr,
1342 REF_EVT(media_change),
1343 REF_EVT(inquiry_change_reported),
1344 REF_EVT(capacity_change_reported),
1345 REF_EVT(soft_threshold_reached),
1346 REF_EVT(mode_parameter_change_reported),
1347 REF_EVT(lun_change_reported),
1348 NULL
1349};
1350
1351static const struct bin_attribute *const scsi_sdev_bin_attrs[] = {
1352 &dev_attr_vpd_pg0,
1353 &dev_attr_vpd_pg83,
1354 &dev_attr_vpd_pg80,
1355 &dev_attr_vpd_pg89,
1356 &dev_attr_vpd_pgb0,
1357 &dev_attr_vpd_pgb1,
1358 &dev_attr_vpd_pgb2,
1359 &dev_attr_vpd_pgb7,
1360 &dev_attr_inquiry,
1361 NULL
1362};
1363static struct attribute_group scsi_sdev_attr_group = {
1364 .attrs = scsi_sdev_attrs,
1365 .bin_attrs = scsi_sdev_bin_attrs,
1366 .is_visible = scsi_sdev_attr_is_visible,
1367 .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1368};
1369
1370static const struct attribute_group *scsi_sdev_attr_groups[] = {
1371 &scsi_sdev_attr_group,
1372 NULL
1373};
1374
1375static int scsi_target_add(struct scsi_target *starget)
1376{
1377 int error;
1378
1379 if (starget->state != STARGET_CREATED)
1380 return 0;
1381
1382 error = device_add(dev: &starget->dev);
1383 if (error) {
1384 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1385 return error;
1386 }
1387 transport_add_device(&starget->dev);
1388 starget->state = STARGET_RUNNING;
1389
1390 pm_runtime_set_active(dev: &starget->dev);
1391 pm_runtime_enable(dev: &starget->dev);
1392 device_enable_async_suspend(dev: &starget->dev);
1393
1394 return 0;
1395}
1396
1397/**
1398 * scsi_sysfs_add_sdev - add scsi device to sysfs
1399 * @sdev: scsi_device to add
1400 *
1401 * Return value:
1402 * 0 on Success / non-zero on Failure
1403 **/
1404int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1405{
1406 int error;
1407 struct scsi_target *starget = sdev->sdev_target;
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(dev: &sdev->sdev_gendev);
1416 scsi_autopm_get_target(starget);
1417 pm_runtime_set_active(dev: &sdev->sdev_gendev);
1418 if (!sdev->rpm_autosuspend)
1419 pm_runtime_forbid(dev: &sdev->sdev_gendev);
1420 pm_runtime_enable(dev: &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(dev: &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(dev: &sdev->sdev_dev);
1435 error = device_add(dev: &sdev->sdev_dev);
1436 if (error) {
1437 sdev_printk(KERN_INFO, sdev,
1438 "failed to add class device: %d\n", error);
1439 device_del(dev: &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(ptr: sdev->bsg_dev)) {
1448 error = PTR_ERR(ptr: 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(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, state: SDEV_CANCEL);
1485 if (res != 0) {
1486 res = scsi_device_set_state(sdev, state: SDEV_DEL);
1487 if (res == 0)
1488 scsi_start_queue(sdev);
1489 }
1490 mutex_unlock(lock: &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(bcd: sdev->bsg_dev);
1497 device_unregister(dev: &sdev->sdev_dev);
1498 transport_remove_device(dev);
1499 device_del(dev);
1500 } else
1501 put_device(dev: &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(lock: &sdev->state_mutex);
1509 scsi_device_set_state(sdev, state: SDEV_DEL);
1510 mutex_unlock(lock: &sdev->state_mutex);
1511
1512 blk_mq_destroy_queue(sdev->request_queue);
1513 kref_put(kref: &sdev->host->tagset_refcnt, release: scsi_mq_free_tags);
1514 cancel_work_sync(work: &sdev->requeue_work);
1515
1516 if (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(lock: &shost->scan_mutex);
1539 __scsi_remove_device(sdev);
1540 mutex_unlock(lock: &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(dev: 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(dev: &sdev->sdev_gendev))
1565 continue;
1566 spin_unlock_irqrestore(lock: shost->host_lock, flags);
1567 scsi_remove_device(sdev);
1568 put_device(dev: &sdev->sdev_gendev);
1569 spin_lock_irqsave(shost->host_lock, flags);
1570 goto restart;
1571 }
1572 spin_unlock_irqrestore(lock: 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: 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(kref: &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(lock: shost->host_lock, flags);
1603 __scsi_remove_target(starget);
1604 scsi_target_reap(starget);
1605 goto restart;
1606 }
1607 }
1608 spin_unlock_irqrestore(lock: shost->host_lock, flags);
1609}
1610EXPORT_SYMBOL(scsi_remove_target);
1611
1612int __scsi_register_driver(struct device_driver *drv, struct module *owner)
1613{
1614 drv->bus = &scsi_bus_type;
1615 drv->owner = owner;
1616
1617 return driver_register(drv);
1618}
1619EXPORT_SYMBOL(__scsi_register_driver);
1620
1621int scsi_register_interface(struct class_interface *intf)
1622{
1623 intf->class = &sdev_class;
1624
1625 return class_interface_register(intf);
1626}
1627EXPORT_SYMBOL(scsi_register_interface);
1628
1629/**
1630 * scsi_sysfs_add_host - add scsi host to subsystem
1631 * @shost: scsi host struct to add to subsystem
1632 **/
1633int scsi_sysfs_add_host(struct Scsi_Host *shost)
1634{
1635 transport_register_device(dev: &shost->shost_gendev);
1636 transport_configure_device(&shost->shost_gendev);
1637 return 0;
1638}
1639
1640static const struct device_type scsi_dev_type = {
1641 .name = "scsi_device",
1642 .release = scsi_device_dev_release,
1643 .groups = scsi_sdev_attr_groups,
1644};
1645
1646void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1647{
1648 unsigned long flags;
1649 struct Scsi_Host *shost = sdev->host;
1650 const struct scsi_host_template *hostt = shost->hostt;
1651 struct scsi_target *starget = sdev->sdev_target;
1652
1653 device_initialize(dev: &sdev->sdev_gendev);
1654 sdev->sdev_gendev.bus = &scsi_bus_type;
1655 sdev->sdev_gendev.type = &scsi_dev_type;
1656 scsi_enable_async_suspend(dev: &sdev->sdev_gendev);
1657 dev_set_name(dev: &sdev->sdev_gendev, name: "%d:%d:%d:%llu",
1658 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1659 sdev->sdev_gendev.groups = hostt->sdev_groups;
1660
1661 device_initialize(dev: &sdev->sdev_dev);
1662 sdev->sdev_dev.parent = get_device(dev: &sdev->sdev_gendev);
1663 sdev->sdev_dev.class = &sdev_class;
1664 dev_set_name(dev: &sdev->sdev_dev, name: "%d:%d:%d:%llu",
1665 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1666 /*
1667 * Get a default scsi_level from the target (derived from sibling
1668 * devices). This is the best we can do for guessing how to set
1669 * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the
1670 * setting doesn't matter, because all the bits are zero anyway.
1671 * But it does matter for higher LUNs.
1672 */
1673 sdev->scsi_level = starget->scsi_level;
1674 if (sdev->scsi_level <= SCSI_2 &&
1675 sdev->scsi_level != SCSI_UNKNOWN &&
1676 !shost->no_scsi2_lun_in_cdb)
1677 sdev->lun_in_cdb = 1;
1678
1679 transport_setup_device(&sdev->sdev_gendev);
1680 spin_lock_irqsave(shost->host_lock, flags);
1681 list_add_tail(new: &sdev->same_target_siblings, head: &starget->devices);
1682 list_add_tail(new: &sdev->siblings, head: &shost->__devices);
1683 spin_unlock_irqrestore(lock: shost->host_lock, flags);
1684 /*
1685 * device can now only be removed via __scsi_remove_device() so hold
1686 * the target. Target will be held in CREATED state until something
1687 * beneath it becomes visible (in which case it moves to RUNNING)
1688 */
1689 kref_get(kref: &starget->reap_ref);
1690}
1691
1692int scsi_is_sdev_device(const struct device *dev)
1693{
1694 return dev->type == &scsi_dev_type;
1695}
1696EXPORT_SYMBOL(scsi_is_sdev_device);
1697
1698/* A blank transport template that is used in drivers that don't
1699 * yet implement Transport Attributes */
1700struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
1701