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Merge tag 'for-5.16/block-2021-10-29' of git://git.kernel.dk/linux-block
[mirror_ubuntu-kernels.git] / drivers / scsi / scsi_sysfs.c
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
30 static struct device_type scsi_dev_type;
31
32 static 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
47 const 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
61 static 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 };
73 const 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
88 static 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
101 static 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
116 static 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
133 static 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) \
161 static ssize_t \
162 show_##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) \
175 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
176
177 #define shost_rd_attr(field, format_string) \
178 shost_rd_attr2(field, field, format_string)
179
180 /*
181 * Create the actual show/store functions and data structures.
182 */
183
184 static ssize_t
185 store_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 };
196 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
197
198 static ssize_t
199 store_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
222 static ssize_t
223 show_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 */
235 static struct device_attribute dev_attr_hstate =
236 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
237
238 static ssize_t
239 show_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
254 static ssize_t
255 show_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
268 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
269
270 static ssize_t
271 show_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
282 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
283
284 static 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
294 static ssize_t
295 store_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 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
312 exit_store_host_reset:
313 if (ret == 0)
314 ret = count;
315 return ret;
316 }
317
318 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
319
320 static ssize_t
321 show_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
331 static ssize_t
332 store_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
370 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
371
372 shost_rd_attr(unique_id, "%u\n");
373 shost_rd_attr(cmd_per_lun, "%hd\n");
374 shost_rd_attr(can_queue, "%d\n");
375 shost_rd_attr(sg_tablesize, "%hu\n");
376 shost_rd_attr(sg_prot_tablesize, "%hu\n");
377 shost_rd_attr(prot_capabilities, "%u\n");
378 shost_rd_attr(prot_guard_type, "%hd\n");
379 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
380
381 static ssize_t
382 show_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 }
387 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
388
389 static ssize_t
390 show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
391 {
392 return sprintf(buf, "1\n");
393 }
394 static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
395
396 static ssize_t
397 show_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 }
404 static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL);
405
406 static 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
427 static struct attribute_group scsi_shost_attr_group = {
428 .attrs = scsi_sysfs_shost_attrs,
429 };
430
431 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
432 &scsi_shost_attr_group,
433 NULL
434 };
435
436 static 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
444 static void scsi_device_dev_release_usercontext(struct work_struct *work)
445 {
446 struct scsi_device *sdev;
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 unsigned long flags;
452 struct module *mod;
453
454 sdev = container_of(work, struct scsi_device, ew.work);
455
456 mod = sdev->host->hostt->module;
457
458 scsi_dh_release_device(sdev);
459
460 parent = sdev->sdev_gendev.parent;
461
462 spin_lock_irqsave(sdev->host->host_lock, flags);
463 list_del(&sdev->siblings);
464 list_del(&sdev->same_target_siblings);
465 list_del(&sdev->starved_entry);
466 spin_unlock_irqrestore(sdev->host->host_lock, flags);
467
468 cancel_work_sync(&sdev->event_work);
469
470 list_for_each_safe(this, tmp, &sdev->event_list) {
471 struct scsi_event *evt;
472
473 evt = list_entry(this, struct scsi_event, node);
474 list_del(&evt->node);
475 kfree(evt);
476 }
477
478 blk_put_queue(sdev->request_queue);
479 /* NULL queue means the device can't be used */
480 sdev->request_queue = NULL;
481
482 sbitmap_free(&sdev->budget_map);
483
484 mutex_lock(&sdev->inquiry_mutex);
485 vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
486 lockdep_is_held(&sdev->inquiry_mutex));
487 vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
488 lockdep_is_held(&sdev->inquiry_mutex));
489 vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
490 lockdep_is_held(&sdev->inquiry_mutex));
491 vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
492 lockdep_is_held(&sdev->inquiry_mutex));
493 mutex_unlock(&sdev->inquiry_mutex);
494
495 if (vpd_pg0)
496 kfree_rcu(vpd_pg0, rcu);
497 if (vpd_pg83)
498 kfree_rcu(vpd_pg83, rcu);
499 if (vpd_pg80)
500 kfree_rcu(vpd_pg80, rcu);
501 if (vpd_pg89)
502 kfree_rcu(vpd_pg89, rcu);
503 kfree(sdev->inquiry);
504 kfree(sdev);
505
506 if (parent)
507 put_device(parent);
508 module_put(mod);
509 }
510
511 static void scsi_device_dev_release(struct device *dev)
512 {
513 struct scsi_device *sdp = to_scsi_device(dev);
514
515 /* Set module pointer as NULL in case of module unloading */
516 if (!try_module_get(sdp->host->hostt->module))
517 sdp->host->hostt->module = NULL;
518
519 execute_in_process_context(scsi_device_dev_release_usercontext,
520 &sdp->ew);
521 }
522
523 static struct class sdev_class = {
524 .name = "scsi_device",
525 .dev_release = scsi_device_cls_release,
526 };
527
528 /* all probing is done in the individual ->probe routines */
529 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
530 {
531 struct scsi_device *sdp;
532
533 if (dev->type != &scsi_dev_type)
534 return 0;
535
536 sdp = to_scsi_device(dev);
537 if (sdp->no_uld_attach)
538 return 0;
539 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
540 }
541
542 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
543 {
544 struct scsi_device *sdev;
545
546 if (dev->type != &scsi_dev_type)
547 return 0;
548
549 sdev = to_scsi_device(dev);
550
551 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
552 return 0;
553 }
554
555 struct bus_type scsi_bus_type = {
556 .name = "scsi",
557 .match = scsi_bus_match,
558 .uevent = scsi_bus_uevent,
559 #ifdef CONFIG_PM
560 .pm = &scsi_bus_pm_ops,
561 #endif
562 };
563 EXPORT_SYMBOL_GPL(scsi_bus_type);
564
565 int scsi_sysfs_register(void)
566 {
567 int error;
568
569 error = bus_register(&scsi_bus_type);
570 if (!error) {
571 error = class_register(&sdev_class);
572 if (error)
573 bus_unregister(&scsi_bus_type);
574 }
575
576 return error;
577 }
578
579 void scsi_sysfs_unregister(void)
580 {
581 class_unregister(&sdev_class);
582 bus_unregister(&scsi_bus_type);
583 }
584
585 /*
586 * sdev_show_function: macro to create an attr function that can be used to
587 * show a non-bit field.
588 */
589 #define sdev_show_function(field, format_string) \
590 static ssize_t \
591 sdev_show_##field (struct device *dev, struct device_attribute *attr, \
592 char *buf) \
593 { \
594 struct scsi_device *sdev; \
595 sdev = to_scsi_device(dev); \
596 return snprintf (buf, 20, format_string, sdev->field); \
597 } \
598
599 /*
600 * sdev_rd_attr: macro to create a function and attribute variable for a
601 * read only field.
602 */
603 #define sdev_rd_attr(field, format_string) \
604 sdev_show_function(field, format_string) \
605 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
606
607
608 /*
609 * sdev_rw_attr: create a function and attribute variable for a
610 * read/write field.
611 */
612 #define sdev_rw_attr(field, format_string) \
613 sdev_show_function(field, format_string) \
614 \
615 static ssize_t \
616 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
617 const char *buf, size_t count) \
618 { \
619 struct scsi_device *sdev; \
620 sdev = to_scsi_device(dev); \
621 sscanf (buf, format_string, &sdev->field); \
622 return count; \
623 } \
624 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
625
626 /* Currently we don't export bit fields, but we might in future,
627 * so leave this code in */
628 #if 0
629 /*
630 * sdev_rd_attr: create a function and attribute variable for a
631 * read/write bit field.
632 */
633 #define sdev_rw_attr_bit(field) \
634 sdev_show_function(field, "%d\n") \
635 \
636 static ssize_t \
637 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
638 const char *buf, size_t count) \
639 { \
640 int ret; \
641 struct scsi_device *sdev; \
642 ret = scsi_sdev_check_buf_bit(buf); \
643 if (ret >= 0) { \
644 sdev = to_scsi_device(dev); \
645 sdev->field = ret; \
646 ret = count; \
647 } \
648 return ret; \
649 } \
650 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
651
652 /*
653 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
654 * else return -EINVAL.
655 */
656 static int scsi_sdev_check_buf_bit(const char *buf)
657 {
658 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
659 if (buf[0] == '1')
660 return 1;
661 else if (buf[0] == '0')
662 return 0;
663 else
664 return -EINVAL;
665 } else
666 return -EINVAL;
667 }
668 #endif
669 /*
670 * Create the actual show/store functions and data structures.
671 */
672 sdev_rd_attr (type, "%d\n");
673 sdev_rd_attr (scsi_level, "%d\n");
674 sdev_rd_attr (vendor, "%.8s\n");
675 sdev_rd_attr (model, "%.16s\n");
676 sdev_rd_attr (rev, "%.4s\n");
677
678 static ssize_t
679 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
680 char *buf)
681 {
682 struct scsi_device *sdev = to_scsi_device(dev);
683 return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
684 }
685 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
686
687 static ssize_t
688 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
689 char *buf)
690 {
691 struct scsi_device *sdev = to_scsi_device(dev);
692 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
693 }
694 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
695
696 /*
697 * TODO: can we make these symlinks to the block layer ones?
698 */
699 static ssize_t
700 sdev_show_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, "%d\n", sdev->request_queue->rq_timeout / HZ);
705 }
706
707 static ssize_t
708 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
709 const char *buf, size_t count)
710 {
711 struct scsi_device *sdev;
712 int timeout;
713 sdev = to_scsi_device(dev);
714 sscanf (buf, "%d\n", &timeout);
715 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
716 return count;
717 }
718 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
719
720 static ssize_t
721 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
722 {
723 struct scsi_device *sdev;
724 sdev = to_scsi_device(dev);
725 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
726 }
727
728 static ssize_t
729 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
730 const char *buf, size_t count)
731 {
732 struct scsi_device *sdev;
733 unsigned int eh_timeout;
734 int err;
735
736 if (!capable(CAP_SYS_ADMIN))
737 return -EACCES;
738
739 sdev = to_scsi_device(dev);
740 err = kstrtouint(buf, 10, &eh_timeout);
741 if (err)
742 return err;
743 sdev->eh_timeout = eh_timeout * HZ;
744
745 return count;
746 }
747 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
748
749 static ssize_t
750 store_rescan_field (struct device *dev, struct device_attribute *attr,
751 const char *buf, size_t count)
752 {
753 scsi_rescan_device(dev);
754 return count;
755 }
756 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
757
758 static ssize_t
759 sdev_store_delete(struct device *dev, struct device_attribute *attr,
760 const char *buf, size_t count)
761 {
762 struct kernfs_node *kn;
763 struct scsi_device *sdev = to_scsi_device(dev);
764
765 /*
766 * We need to try to get module, avoiding the module been removed
767 * during delete.
768 */
769 if (scsi_device_get(sdev))
770 return -ENODEV;
771
772 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
773 WARN_ON_ONCE(!kn);
774 /*
775 * Concurrent writes into the "delete" sysfs attribute may trigger
776 * concurrent calls to device_remove_file() and scsi_remove_device().
777 * device_remove_file() handles concurrent removal calls by
778 * serializing these and by ignoring the second and later removal
779 * attempts. Concurrent calls of scsi_remove_device() are
780 * serialized. The second and later calls of scsi_remove_device() are
781 * ignored because the first call of that function changes the device
782 * state into SDEV_DEL.
783 */
784 device_remove_file(dev, attr);
785 scsi_remove_device(sdev);
786 if (kn)
787 sysfs_unbreak_active_protection(kn);
788 scsi_device_put(sdev);
789 return count;
790 };
791 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
792
793 static ssize_t
794 store_state_field(struct device *dev, struct device_attribute *attr,
795 const char *buf, size_t count)
796 {
797 int i, ret;
798 struct scsi_device *sdev = to_scsi_device(dev);
799 enum scsi_device_state state = 0;
800
801 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
802 const int len = strlen(sdev_states[i].name);
803 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
804 buf[len] == '\n') {
805 state = sdev_states[i].value;
806 break;
807 }
808 }
809 switch (state) {
810 case SDEV_RUNNING:
811 case SDEV_OFFLINE:
812 break;
813 default:
814 return -EINVAL;
815 }
816
817 mutex_lock(&sdev->state_mutex);
818 ret = scsi_device_set_state(sdev, state);
819 /*
820 * If the device state changes to SDEV_RUNNING, we need to
821 * run the queue to avoid I/O hang, and rescan the device
822 * to revalidate it. Running the queue first is necessary
823 * because another thread may be waiting inside
824 * blk_mq_freeze_queue_wait() and because that call may be
825 * waiting for pending I/O to finish.
826 */
827 if (ret == 0 && state == SDEV_RUNNING) {
828 blk_mq_run_hw_queues(sdev->request_queue, true);
829 scsi_rescan_device(dev);
830 }
831 mutex_unlock(&sdev->state_mutex);
832
833 return ret == 0 ? count : -EINVAL;
834 }
835
836 static ssize_t
837 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
838 {
839 struct scsi_device *sdev = to_scsi_device(dev);
840 const char *name = scsi_device_state_name(sdev->sdev_state);
841
842 if (!name)
843 return -EINVAL;
844
845 return snprintf(buf, 20, "%s\n", name);
846 }
847
848 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
849
850 static ssize_t
851 show_queue_type_field(struct device *dev, struct device_attribute *attr,
852 char *buf)
853 {
854 struct scsi_device *sdev = to_scsi_device(dev);
855 const char *name = "none";
856
857 if (sdev->simple_tags)
858 name = "simple";
859
860 return snprintf(buf, 20, "%s\n", name);
861 }
862
863 static ssize_t
864 store_queue_type_field(struct device *dev, struct device_attribute *attr,
865 const char *buf, size_t count)
866 {
867 struct scsi_device *sdev = to_scsi_device(dev);
868
869 if (!sdev->tagged_supported)
870 return -EINVAL;
871
872 sdev_printk(KERN_INFO, sdev,
873 "ignoring write to deprecated queue_type attribute");
874 return count;
875 }
876
877 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
878 store_queue_type_field);
879
880 #define sdev_vpd_pg_attr(_page) \
881 static ssize_t \
882 show_vpd_##_page(struct file *filp, struct kobject *kobj, \
883 struct bin_attribute *bin_attr, \
884 char *buf, loff_t off, size_t count) \
885 { \
886 struct device *dev = kobj_to_dev(kobj); \
887 struct scsi_device *sdev = to_scsi_device(dev); \
888 struct scsi_vpd *vpd_page; \
889 int ret = -EINVAL; \
890 \
891 rcu_read_lock(); \
892 vpd_page = rcu_dereference(sdev->vpd_##_page); \
893 if (vpd_page) \
894 ret = memory_read_from_buffer(buf, count, &off, \
895 vpd_page->data, vpd_page->len); \
896 rcu_read_unlock(); \
897 return ret; \
898 } \
899 static struct bin_attribute dev_attr_vpd_##_page = { \
900 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
901 .size = 0, \
902 .read = show_vpd_##_page, \
903 };
904
905 sdev_vpd_pg_attr(pg83);
906 sdev_vpd_pg_attr(pg80);
907 sdev_vpd_pg_attr(pg89);
908 sdev_vpd_pg_attr(pg0);
909
910 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
911 struct bin_attribute *bin_attr,
912 char *buf, loff_t off, size_t count)
913 {
914 struct device *dev = kobj_to_dev(kobj);
915 struct scsi_device *sdev = to_scsi_device(dev);
916
917 if (!sdev->inquiry)
918 return -EINVAL;
919
920 return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
921 sdev->inquiry_len);
922 }
923
924 static struct bin_attribute dev_attr_inquiry = {
925 .attr = {
926 .name = "inquiry",
927 .mode = S_IRUGO,
928 },
929 .size = 0,
930 .read = show_inquiry,
931 };
932
933 static ssize_t
934 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
935 char *buf)
936 {
937 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
938 }
939
940 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
941
942 #define show_sdev_iostat(field) \
943 static ssize_t \
944 show_iostat_##field(struct device *dev, struct device_attribute *attr, \
945 char *buf) \
946 { \
947 struct scsi_device *sdev = to_scsi_device(dev); \
948 unsigned long long count = atomic_read(&sdev->field); \
949 return snprintf(buf, 20, "0x%llx\n", count); \
950 } \
951 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
952
953 show_sdev_iostat(iorequest_cnt);
954 show_sdev_iostat(iodone_cnt);
955 show_sdev_iostat(ioerr_cnt);
956
957 static ssize_t
958 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
959 {
960 struct scsi_device *sdev;
961 sdev = to_scsi_device(dev);
962 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
963 }
964 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
965
966 #define DECLARE_EVT_SHOW(name, Cap_name) \
967 static ssize_t \
968 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
969 char *buf) \
970 { \
971 struct scsi_device *sdev = to_scsi_device(dev); \
972 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
973 return snprintf(buf, 20, "%d\n", val); \
974 }
975
976 #define DECLARE_EVT_STORE(name, Cap_name) \
977 static ssize_t \
978 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
979 const char *buf, size_t count) \
980 { \
981 struct scsi_device *sdev = to_scsi_device(dev); \
982 int val = simple_strtoul(buf, NULL, 0); \
983 if (val == 0) \
984 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
985 else if (val == 1) \
986 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
987 else \
988 return -EINVAL; \
989 return count; \
990 }
991
992 #define DECLARE_EVT(name, Cap_name) \
993 DECLARE_EVT_SHOW(name, Cap_name) \
994 DECLARE_EVT_STORE(name, Cap_name) \
995 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
996 sdev_store_evt_##name);
997 #define REF_EVT(name) &dev_attr_evt_##name.attr
998
999 DECLARE_EVT(media_change, MEDIA_CHANGE)
1000 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1001 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1002 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1003 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1004 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1005
1006 static ssize_t
1007 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1008 const char *buf, size_t count)
1009 {
1010 int depth, retval;
1011 struct scsi_device *sdev = to_scsi_device(dev);
1012 struct scsi_host_template *sht = sdev->host->hostt;
1013
1014 if (!sht->change_queue_depth)
1015 return -EINVAL;
1016
1017 depth = simple_strtoul(buf, NULL, 0);
1018
1019 if (depth < 1 || depth > sdev->host->can_queue)
1020 return -EINVAL;
1021
1022 retval = sht->change_queue_depth(sdev, depth);
1023 if (retval < 0)
1024 return retval;
1025
1026 sdev->max_queue_depth = sdev->queue_depth;
1027
1028 return count;
1029 }
1030 sdev_show_function(queue_depth, "%d\n");
1031
1032 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1033 sdev_store_queue_depth);
1034
1035 static ssize_t
1036 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1037 char *buf)
1038 {
1039 struct scsi_device *sdev = to_scsi_device(dev);
1040 ssize_t count;
1041
1042 count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1043 if (count > 0) {
1044 buf[count] = '\n';
1045 count++;
1046 }
1047 return count;
1048 }
1049 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1050
1051 #define BLIST_FLAG_NAME(name) \
1052 [const_ilog2((__force __u64)BLIST_##name)] = #name
1053 static const char *const sdev_bflags_name[] = {
1054 #include "scsi_devinfo_tbl.c"
1055 };
1056 #undef BLIST_FLAG_NAME
1057
1058 static ssize_t
1059 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1060 char *buf)
1061 {
1062 struct scsi_device *sdev = to_scsi_device(dev);
1063 int i;
1064 ssize_t len = 0;
1065
1066 for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1067 const char *name = NULL;
1068
1069 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1070 continue;
1071 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1072 name = sdev_bflags_name[i];
1073
1074 if (name)
1075 len += scnprintf(buf + len, PAGE_SIZE - len,
1076 "%s%s", len ? " " : "", name);
1077 else
1078 len += scnprintf(buf + len, PAGE_SIZE - len,
1079 "%sINVALID_BIT(%d)", len ? " " : "", i);
1080 }
1081 if (len)
1082 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1083 return len;
1084 }
1085 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1086
1087 #ifdef CONFIG_SCSI_DH
1088 static ssize_t
1089 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1090 char *buf)
1091 {
1092 struct scsi_device *sdev = to_scsi_device(dev);
1093
1094 if (!sdev->handler)
1095 return snprintf(buf, 20, "detached\n");
1096
1097 return snprintf(buf, 20, "%s\n", sdev->handler->name);
1098 }
1099
1100 static ssize_t
1101 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1102 const char *buf, size_t count)
1103 {
1104 struct scsi_device *sdev = to_scsi_device(dev);
1105 int err = -EINVAL;
1106
1107 if (sdev->sdev_state == SDEV_CANCEL ||
1108 sdev->sdev_state == SDEV_DEL)
1109 return -ENODEV;
1110
1111 if (!sdev->handler) {
1112 /*
1113 * Attach to a device handler
1114 */
1115 err = scsi_dh_attach(sdev->request_queue, buf);
1116 } else if (!strncmp(buf, "activate", 8)) {
1117 /*
1118 * Activate a device handler
1119 */
1120 if (sdev->handler->activate)
1121 err = sdev->handler->activate(sdev, NULL, NULL);
1122 else
1123 err = 0;
1124 } else if (!strncmp(buf, "detach", 6)) {
1125 /*
1126 * Detach from a device handler
1127 */
1128 sdev_printk(KERN_WARNING, sdev,
1129 "can't detach handler %s.\n",
1130 sdev->handler->name);
1131 err = -EINVAL;
1132 }
1133
1134 return err < 0 ? err : count;
1135 }
1136
1137 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1138 sdev_store_dh_state);
1139
1140 static ssize_t
1141 sdev_show_access_state(struct device *dev,
1142 struct device_attribute *attr,
1143 char *buf)
1144 {
1145 struct scsi_device *sdev = to_scsi_device(dev);
1146 unsigned char access_state;
1147 const char *access_state_name;
1148
1149 if (!sdev->handler)
1150 return -EINVAL;
1151
1152 access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1153 access_state_name = scsi_access_state_name(access_state);
1154
1155 return sprintf(buf, "%s\n",
1156 access_state_name ? access_state_name : "unknown");
1157 }
1158 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1159
1160 static ssize_t
1161 sdev_show_preferred_path(struct device *dev,
1162 struct device_attribute *attr,
1163 char *buf)
1164 {
1165 struct scsi_device *sdev = to_scsi_device(dev);
1166
1167 if (!sdev->handler)
1168 return -EINVAL;
1169
1170 if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1171 return sprintf(buf, "1\n");
1172 else
1173 return sprintf(buf, "0\n");
1174 }
1175 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1176 #endif
1177
1178 static ssize_t
1179 sdev_show_queue_ramp_up_period(struct device *dev,
1180 struct device_attribute *attr,
1181 char *buf)
1182 {
1183 struct scsi_device *sdev;
1184 sdev = to_scsi_device(dev);
1185 return snprintf(buf, 20, "%u\n",
1186 jiffies_to_msecs(sdev->queue_ramp_up_period));
1187 }
1188
1189 static ssize_t
1190 sdev_store_queue_ramp_up_period(struct device *dev,
1191 struct device_attribute *attr,
1192 const char *buf, size_t count)
1193 {
1194 struct scsi_device *sdev = to_scsi_device(dev);
1195 unsigned int period;
1196
1197 if (kstrtouint(buf, 10, &period))
1198 return -EINVAL;
1199
1200 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1201 return count;
1202 }
1203
1204 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1205 sdev_show_queue_ramp_up_period,
1206 sdev_store_queue_ramp_up_period);
1207
1208 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1209 struct attribute *attr, int i)
1210 {
1211 struct device *dev = kobj_to_dev(kobj);
1212 struct scsi_device *sdev = to_scsi_device(dev);
1213
1214
1215 if (attr == &dev_attr_queue_depth.attr &&
1216 !sdev->host->hostt->change_queue_depth)
1217 return S_IRUGO;
1218
1219 if (attr == &dev_attr_queue_ramp_up_period.attr &&
1220 !sdev->host->hostt->change_queue_depth)
1221 return 0;
1222
1223 #ifdef CONFIG_SCSI_DH
1224 if (attr == &dev_attr_access_state.attr &&
1225 !sdev->handler)
1226 return 0;
1227 if (attr == &dev_attr_preferred_path.attr &&
1228 !sdev->handler)
1229 return 0;
1230 #endif
1231 return attr->mode;
1232 }
1233
1234 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1235 struct bin_attribute *attr, int i)
1236 {
1237 struct device *dev = kobj_to_dev(kobj);
1238 struct scsi_device *sdev = to_scsi_device(dev);
1239
1240
1241 if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1242 return 0;
1243
1244 if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1245 return 0;
1246
1247 if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1248 return 0;
1249
1250 if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1251 return 0;
1252
1253 return S_IRUGO;
1254 }
1255
1256 /* Default template for device attributes. May NOT be modified */
1257 static struct attribute *scsi_sdev_attrs[] = {
1258 &dev_attr_device_blocked.attr,
1259 &dev_attr_type.attr,
1260 &dev_attr_scsi_level.attr,
1261 &dev_attr_device_busy.attr,
1262 &dev_attr_vendor.attr,
1263 &dev_attr_model.attr,
1264 &dev_attr_rev.attr,
1265 &dev_attr_rescan.attr,
1266 &dev_attr_delete.attr,
1267 &dev_attr_state.attr,
1268 &dev_attr_timeout.attr,
1269 &dev_attr_eh_timeout.attr,
1270 &dev_attr_iocounterbits.attr,
1271 &dev_attr_iorequest_cnt.attr,
1272 &dev_attr_iodone_cnt.attr,
1273 &dev_attr_ioerr_cnt.attr,
1274 &dev_attr_modalias.attr,
1275 &dev_attr_queue_depth.attr,
1276 &dev_attr_queue_type.attr,
1277 &dev_attr_wwid.attr,
1278 &dev_attr_blacklist.attr,
1279 #ifdef CONFIG_SCSI_DH
1280 &dev_attr_dh_state.attr,
1281 &dev_attr_access_state.attr,
1282 &dev_attr_preferred_path.attr,
1283 #endif
1284 &dev_attr_queue_ramp_up_period.attr,
1285 REF_EVT(media_change),
1286 REF_EVT(inquiry_change_reported),
1287 REF_EVT(capacity_change_reported),
1288 REF_EVT(soft_threshold_reached),
1289 REF_EVT(mode_parameter_change_reported),
1290 REF_EVT(lun_change_reported),
1291 NULL
1292 };
1293
1294 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1295 &dev_attr_vpd_pg0,
1296 &dev_attr_vpd_pg83,
1297 &dev_attr_vpd_pg80,
1298 &dev_attr_vpd_pg89,
1299 &dev_attr_inquiry,
1300 NULL
1301 };
1302 static struct attribute_group scsi_sdev_attr_group = {
1303 .attrs = scsi_sdev_attrs,
1304 .bin_attrs = scsi_sdev_bin_attrs,
1305 .is_visible = scsi_sdev_attr_is_visible,
1306 .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1307 };
1308
1309 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1310 &scsi_sdev_attr_group,
1311 NULL
1312 };
1313
1314 static int scsi_target_add(struct scsi_target *starget)
1315 {
1316 int error;
1317
1318 if (starget->state != STARGET_CREATED)
1319 return 0;
1320
1321 error = device_add(&starget->dev);
1322 if (error) {
1323 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1324 return error;
1325 }
1326 transport_add_device(&starget->dev);
1327 starget->state = STARGET_RUNNING;
1328
1329 pm_runtime_set_active(&starget->dev);
1330 pm_runtime_enable(&starget->dev);
1331 device_enable_async_suspend(&starget->dev);
1332
1333 return 0;
1334 }
1335
1336 /**
1337 * scsi_sysfs_add_sdev - add scsi device to sysfs
1338 * @sdev: scsi_device to add
1339 *
1340 * Return value:
1341 * 0 on Success / non-zero on Failure
1342 **/
1343 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1344 {
1345 int error, i;
1346 struct scsi_target *starget = sdev->sdev_target;
1347
1348 error = scsi_target_add(starget);
1349 if (error)
1350 return error;
1351
1352 transport_configure_device(&starget->dev);
1353
1354 device_enable_async_suspend(&sdev->sdev_gendev);
1355 scsi_autopm_get_target(starget);
1356 pm_runtime_set_active(&sdev->sdev_gendev);
1357 if (!sdev->rpm_autosuspend)
1358 pm_runtime_forbid(&sdev->sdev_gendev);
1359 pm_runtime_enable(&sdev->sdev_gendev);
1360 scsi_autopm_put_target(starget);
1361
1362 scsi_autopm_get_device(sdev);
1363
1364 scsi_dh_add_device(sdev);
1365
1366 error = device_add(&sdev->sdev_gendev);
1367 if (error) {
1368 sdev_printk(KERN_INFO, sdev,
1369 "failed to add device: %d\n", error);
1370 return error;
1371 }
1372
1373 device_enable_async_suspend(&sdev->sdev_dev);
1374 error = device_add(&sdev->sdev_dev);
1375 if (error) {
1376 sdev_printk(KERN_INFO, sdev,
1377 "failed to add class device: %d\n", error);
1378 device_del(&sdev->sdev_gendev);
1379 return error;
1380 }
1381 transport_add_device(&sdev->sdev_gendev);
1382 sdev->is_visible = 1;
1383
1384 if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1385 sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1386 if (IS_ERR(sdev->bsg_dev)) {
1387 /*
1388 * We're treating error on bsg register as non-fatal, so
1389 * pretend nothing went wrong.
1390 */
1391 sdev_printk(KERN_INFO, sdev,
1392 "Failed to register bsg queue, errno=%d\n",
1393 error);
1394 sdev->bsg_dev = NULL;
1395 }
1396 }
1397
1398 /* add additional host specific attributes */
1399 if (sdev->host->hostt->sdev_attrs) {
1400 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1401 error = device_create_file(&sdev->sdev_gendev,
1402 sdev->host->hostt->sdev_attrs[i]);
1403 if (error)
1404 return error;
1405 }
1406 }
1407
1408 if (sdev->host->hostt->sdev_groups) {
1409 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1410 sdev->host->hostt->sdev_groups);
1411 if (error)
1412 return error;
1413 }
1414
1415 scsi_autopm_put_device(sdev);
1416 return error;
1417 }
1418
1419 void __scsi_remove_device(struct scsi_device *sdev)
1420 {
1421 struct device *dev = &sdev->sdev_gendev;
1422 int res;
1423
1424 /*
1425 * This cleanup path is not reentrant and while it is impossible
1426 * to get a new reference with scsi_device_get() someone can still
1427 * hold a previously acquired one.
1428 */
1429 if (sdev->sdev_state == SDEV_DEL)
1430 return;
1431
1432 if (sdev->is_visible) {
1433 /*
1434 * If scsi_internal_target_block() is running concurrently,
1435 * wait until it has finished before changing the device state.
1436 */
1437 mutex_lock(&sdev->state_mutex);
1438 /*
1439 * If blocked, we go straight to DEL and restart the queue so
1440 * any commands issued during driver shutdown (like sync
1441 * cache) are errored immediately.
1442 */
1443 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1444 if (res != 0) {
1445 res = scsi_device_set_state(sdev, SDEV_DEL);
1446 if (res == 0)
1447 scsi_start_queue(sdev);
1448 }
1449 mutex_unlock(&sdev->state_mutex);
1450
1451 if (res != 0)
1452 return;
1453
1454 if (sdev->host->hostt->sdev_groups)
1455 sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1456 sdev->host->hostt->sdev_groups);
1457
1458 if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1459 bsg_unregister_queue(sdev->bsg_dev);
1460 device_unregister(&sdev->sdev_dev);
1461 transport_remove_device(dev);
1462 device_del(dev);
1463 } else
1464 put_device(&sdev->sdev_dev);
1465
1466 /*
1467 * Stop accepting new requests and wait until all queuecommand() and
1468 * scsi_run_queue() invocations have finished before tearing down the
1469 * device.
1470 */
1471 mutex_lock(&sdev->state_mutex);
1472 scsi_device_set_state(sdev, SDEV_DEL);
1473 mutex_unlock(&sdev->state_mutex);
1474
1475 blk_cleanup_queue(sdev->request_queue);
1476 cancel_work_sync(&sdev->requeue_work);
1477
1478 if (sdev->host->hostt->slave_destroy)
1479 sdev->host->hostt->slave_destroy(sdev);
1480 transport_destroy_device(dev);
1481
1482 /*
1483 * Paired with the kref_get() in scsi_sysfs_initialize(). We have
1484 * removed sysfs visibility from the device, so make the target
1485 * invisible if this was the last device underneath it.
1486 */
1487 scsi_target_reap(scsi_target(sdev));
1488
1489 put_device(dev);
1490 }
1491
1492 /**
1493 * scsi_remove_device - unregister a device from the scsi bus
1494 * @sdev: scsi_device to unregister
1495 **/
1496 void scsi_remove_device(struct scsi_device *sdev)
1497 {
1498 struct Scsi_Host *shost = sdev->host;
1499
1500 mutex_lock(&shost->scan_mutex);
1501 __scsi_remove_device(sdev);
1502 mutex_unlock(&shost->scan_mutex);
1503 }
1504 EXPORT_SYMBOL(scsi_remove_device);
1505
1506 static void __scsi_remove_target(struct scsi_target *starget)
1507 {
1508 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1509 unsigned long flags;
1510 struct scsi_device *sdev;
1511
1512 spin_lock_irqsave(shost->host_lock, flags);
1513 restart:
1514 list_for_each_entry(sdev, &shost->__devices, siblings) {
1515 /*
1516 * We cannot call scsi_device_get() here, as
1517 * we might've been called from rmmod() causing
1518 * scsi_device_get() to fail the module_is_live()
1519 * check.
1520 */
1521 if (sdev->channel != starget->channel ||
1522 sdev->id != starget->id)
1523 continue;
1524 if (sdev->sdev_state == SDEV_DEL ||
1525 sdev->sdev_state == SDEV_CANCEL ||
1526 !get_device(&sdev->sdev_gendev))
1527 continue;
1528 spin_unlock_irqrestore(shost->host_lock, flags);
1529 scsi_remove_device(sdev);
1530 put_device(&sdev->sdev_gendev);
1531 spin_lock_irqsave(shost->host_lock, flags);
1532 goto restart;
1533 }
1534 spin_unlock_irqrestore(shost->host_lock, flags);
1535 }
1536
1537 /**
1538 * scsi_remove_target - try to remove a target and all its devices
1539 * @dev: generic starget or parent of generic stargets to be removed
1540 *
1541 * Note: This is slightly racy. It is possible that if the user
1542 * requests the addition of another device then the target won't be
1543 * removed.
1544 */
1545 void scsi_remove_target(struct device *dev)
1546 {
1547 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1548 struct scsi_target *starget;
1549 unsigned long flags;
1550
1551 restart:
1552 spin_lock_irqsave(shost->host_lock, flags);
1553 list_for_each_entry(starget, &shost->__targets, siblings) {
1554 if (starget->state == STARGET_DEL ||
1555 starget->state == STARGET_REMOVE ||
1556 starget->state == STARGET_CREATED_REMOVE)
1557 continue;
1558 if (starget->dev.parent == dev || &starget->dev == dev) {
1559 kref_get(&starget->reap_ref);
1560 if (starget->state == STARGET_CREATED)
1561 starget->state = STARGET_CREATED_REMOVE;
1562 else
1563 starget->state = STARGET_REMOVE;
1564 spin_unlock_irqrestore(shost->host_lock, flags);
1565 __scsi_remove_target(starget);
1566 scsi_target_reap(starget);
1567 goto restart;
1568 }
1569 }
1570 spin_unlock_irqrestore(shost->host_lock, flags);
1571 }
1572 EXPORT_SYMBOL(scsi_remove_target);
1573
1574 int scsi_register_driver(struct device_driver *drv)
1575 {
1576 drv->bus = &scsi_bus_type;
1577
1578 return driver_register(drv);
1579 }
1580 EXPORT_SYMBOL(scsi_register_driver);
1581
1582 int scsi_register_interface(struct class_interface *intf)
1583 {
1584 intf->class = &sdev_class;
1585
1586 return class_interface_register(intf);
1587 }
1588 EXPORT_SYMBOL(scsi_register_interface);
1589
1590 /**
1591 * scsi_sysfs_add_host - add scsi host to subsystem
1592 * @shost: scsi host struct to add to subsystem
1593 **/
1594 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1595 {
1596 int error, i;
1597
1598 /* add host specific attributes */
1599 if (shost->hostt->shost_attrs) {
1600 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1601 error = device_create_file(&shost->shost_dev,
1602 shost->hostt->shost_attrs[i]);
1603 if (error)
1604 return error;
1605 }
1606 }
1607
1608 transport_register_device(&shost->shost_gendev);
1609 transport_configure_device(&shost->shost_gendev);
1610 return 0;
1611 }
1612
1613 static struct device_type scsi_dev_type = {
1614 .name = "scsi_device",
1615 .release = scsi_device_dev_release,
1616 .groups = scsi_sdev_attr_groups,
1617 };
1618
1619 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1620 {
1621 unsigned long flags;
1622 struct Scsi_Host *shost = sdev->host;
1623 struct scsi_target *starget = sdev->sdev_target;
1624
1625 device_initialize(&sdev->sdev_gendev);
1626 sdev->sdev_gendev.bus = &scsi_bus_type;
1627 sdev->sdev_gendev.type = &scsi_dev_type;
1628 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1629 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1630
1631 device_initialize(&sdev->sdev_dev);
1632 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1633 sdev->sdev_dev.class = &sdev_class;
1634 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1635 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1636 /*
1637 * Get a default scsi_level from the target (derived from sibling
1638 * devices). This is the best we can do for guessing how to set
1639 * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the
1640 * setting doesn't matter, because all the bits are zero anyway.
1641 * But it does matter for higher LUNs.
1642 */
1643 sdev->scsi_level = starget->scsi_level;
1644 if (sdev->scsi_level <= SCSI_2 &&
1645 sdev->scsi_level != SCSI_UNKNOWN &&
1646 !shost->no_scsi2_lun_in_cdb)
1647 sdev->lun_in_cdb = 1;
1648
1649 transport_setup_device(&sdev->sdev_gendev);
1650 spin_lock_irqsave(shost->host_lock, flags);
1651 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1652 list_add_tail(&sdev->siblings, &shost->__devices);
1653 spin_unlock_irqrestore(shost->host_lock, flags);
1654 /*
1655 * device can now only be removed via __scsi_remove_device() so hold
1656 * the target. Target will be held in CREATED state until something
1657 * beneath it becomes visible (in which case it moves to RUNNING)
1658 */
1659 kref_get(&starget->reap_ref);
1660 }
1661
1662 int scsi_is_sdev_device(const struct device *dev)
1663 {
1664 return dev->type == &scsi_dev_type;
1665 }
1666 EXPORT_SYMBOL(scsi_is_sdev_device);
1667
1668 /* A blank transport template that is used in drivers that don't
1669 * yet implement Transport Attributes */
1670 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
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