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