GNU Linux-libre 5.19-rc6-gnu
[releases.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 const struct attribute_group scsi_shost_attr_group = {
428         .attrs =        scsi_sysfs_shost_attrs,
429 };
430
431 const struct attribute_group *scsi_shost_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         struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = NULL;
452         unsigned long flags;
453         struct module *mod;
454
455         sdev = container_of(work, struct scsi_device, ew.work);
456
457         mod = sdev->host->hostt->module;
458
459         scsi_dh_release_device(sdev);
460
461         parent = sdev->sdev_gendev.parent;
462
463         spin_lock_irqsave(sdev->host->host_lock, flags);
464         list_del(&sdev->siblings);
465         list_del(&sdev->same_target_siblings);
466         list_del(&sdev->starved_entry);
467         spin_unlock_irqrestore(sdev->host->host_lock, flags);
468
469         cancel_work_sync(&sdev->event_work);
470
471         list_for_each_safe(this, tmp, &sdev->event_list) {
472                 struct scsi_event *evt;
473
474                 evt = list_entry(this, struct scsi_event, node);
475                 list_del(&evt->node);
476                 kfree(evt);
477         }
478
479         blk_put_queue(sdev->request_queue);
480         /* NULL queue means the device can't be used */
481         sdev->request_queue = NULL;
482
483         sbitmap_free(&sdev->budget_map);
484
485         mutex_lock(&sdev->inquiry_mutex);
486         vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
487                                        lockdep_is_held(&sdev->inquiry_mutex));
488         vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
489                                        lockdep_is_held(&sdev->inquiry_mutex));
490         vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
491                                        lockdep_is_held(&sdev->inquiry_mutex));
492         vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
493                                        lockdep_is_held(&sdev->inquiry_mutex));
494         vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
495                                        lockdep_is_held(&sdev->inquiry_mutex));
496         vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
497                                        lockdep_is_held(&sdev->inquiry_mutex));
498         vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
499                                        lockdep_is_held(&sdev->inquiry_mutex));
500         mutex_unlock(&sdev->inquiry_mutex);
501
502         if (vpd_pg0)
503                 kfree_rcu(vpd_pg0, rcu);
504         if (vpd_pg83)
505                 kfree_rcu(vpd_pg83, rcu);
506         if (vpd_pg80)
507                 kfree_rcu(vpd_pg80, rcu);
508         if (vpd_pg89)
509                 kfree_rcu(vpd_pg89, rcu);
510         if (vpd_pgb0)
511                 kfree_rcu(vpd_pgb0, rcu);
512         if (vpd_pgb1)
513                 kfree_rcu(vpd_pgb1, rcu);
514         if (vpd_pgb2)
515                 kfree_rcu(vpd_pgb2, rcu);
516         kfree(sdev->inquiry);
517         kfree(sdev);
518
519         if (parent)
520                 put_device(parent);
521         module_put(mod);
522 }
523
524 static void scsi_device_dev_release(struct device *dev)
525 {
526         struct scsi_device *sdp = to_scsi_device(dev);
527
528         /* Set module pointer as NULL in case of module unloading */
529         if (!try_module_get(sdp->host->hostt->module))
530                 sdp->host->hostt->module = NULL;
531
532         execute_in_process_context(scsi_device_dev_release_usercontext,
533                                    &sdp->ew);
534 }
535
536 static struct class sdev_class = {
537         .name           = "scsi_device",
538         .dev_release    = scsi_device_cls_release,
539 };
540
541 /* all probing is done in the individual ->probe routines */
542 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
543 {
544         struct scsi_device *sdp;
545
546         if (dev->type != &scsi_dev_type)
547                 return 0;
548
549         sdp = to_scsi_device(dev);
550         if (sdp->no_uld_attach)
551                 return 0;
552         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
553 }
554
555 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
556 {
557         struct scsi_device *sdev;
558
559         if (dev->type != &scsi_dev_type)
560                 return 0;
561
562         sdev = to_scsi_device(dev);
563
564         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
565         return 0;
566 }
567
568 struct bus_type scsi_bus_type = {
569         .name           = "scsi",
570         .match          = scsi_bus_match,
571         .uevent         = scsi_bus_uevent,
572 #ifdef CONFIG_PM
573         .pm             = &scsi_bus_pm_ops,
574 #endif
575 };
576
577 int scsi_sysfs_register(void)
578 {
579         int error;
580
581         error = bus_register(&scsi_bus_type);
582         if (!error) {
583                 error = class_register(&sdev_class);
584                 if (error)
585                         bus_unregister(&scsi_bus_type);
586         }
587
588         return error;
589 }
590
591 void scsi_sysfs_unregister(void)
592 {
593         class_unregister(&sdev_class);
594         bus_unregister(&scsi_bus_type);
595 }
596
597 /*
598  * sdev_show_function: macro to create an attr function that can be used to
599  * show a non-bit field.
600  */
601 #define sdev_show_function(field, format_string)                                \
602 static ssize_t                                                          \
603 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
604                    char *buf)                                           \
605 {                                                                       \
606         struct scsi_device *sdev;                                       \
607         sdev = to_scsi_device(dev);                                     \
608         return snprintf (buf, 20, format_string, sdev->field);          \
609 }                                                                       \
610
611 /*
612  * sdev_rd_attr: macro to create a function and attribute variable for a
613  * read only field.
614  */
615 #define sdev_rd_attr(field, format_string)                              \
616         sdev_show_function(field, format_string)                        \
617 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
618
619
620 /*
621  * sdev_rw_attr: create a function and attribute variable for a
622  * read/write field.
623  */
624 #define sdev_rw_attr(field, format_string)                              \
625         sdev_show_function(field, format_string)                                \
626                                                                         \
627 static ssize_t                                                          \
628 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
629                     const char *buf, size_t count)                      \
630 {                                                                       \
631         struct scsi_device *sdev;                                       \
632         sdev = to_scsi_device(dev);                                     \
633         sscanf (buf, format_string, &sdev->field);                      \
634         return count;                                                   \
635 }                                                                       \
636 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
637
638 /* Currently we don't export bit fields, but we might in future,
639  * so leave this code in */
640 #if 0
641 /*
642  * sdev_rd_attr: create a function and attribute variable for a
643  * read/write bit field.
644  */
645 #define sdev_rw_attr_bit(field)                                         \
646         sdev_show_function(field, "%d\n")                                       \
647                                                                         \
648 static ssize_t                                                          \
649 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
650                     const char *buf, size_t count)                      \
651 {                                                                       \
652         int ret;                                                        \
653         struct scsi_device *sdev;                                       \
654         ret = scsi_sdev_check_buf_bit(buf);                             \
655         if (ret >= 0)   {                                               \
656                 sdev = to_scsi_device(dev);                             \
657                 sdev->field = ret;                                      \
658                 ret = count;                                            \
659         }                                                               \
660         return ret;                                                     \
661 }                                                                       \
662 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
663
664 /*
665  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
666  * else return -EINVAL.
667  */
668 static int scsi_sdev_check_buf_bit(const char *buf)
669 {
670         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
671                 if (buf[0] == '1')
672                         return 1;
673                 else if (buf[0] == '0')
674                         return 0;
675                 else 
676                         return -EINVAL;
677         } else
678                 return -EINVAL;
679 }
680 #endif
681 /*
682  * Create the actual show/store functions and data structures.
683  */
684 sdev_rd_attr (type, "%d\n");
685 sdev_rd_attr (scsi_level, "%d\n");
686 sdev_rd_attr (vendor, "%.8s\n");
687 sdev_rd_attr (model, "%.16s\n");
688 sdev_rd_attr (rev, "%.4s\n");
689
690 static ssize_t
691 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
692                 char *buf)
693 {
694         struct scsi_device *sdev = to_scsi_device(dev);
695         return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
696 }
697 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
698
699 static ssize_t
700 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
701                 char *buf)
702 {
703         struct scsi_device *sdev = to_scsi_device(dev);
704         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
705 }
706 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
707
708 /*
709  * TODO: can we make these symlinks to the block layer ones?
710  */
711 static ssize_t
712 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
713 {
714         struct scsi_device *sdev;
715         sdev = to_scsi_device(dev);
716         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
717 }
718
719 static ssize_t
720 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
721                     const char *buf, size_t count)
722 {
723         struct scsi_device *sdev;
724         int timeout;
725         sdev = to_scsi_device(dev);
726         sscanf (buf, "%d\n", &timeout);
727         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
728         return count;
729 }
730 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
731
732 static ssize_t
733 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
734 {
735         struct scsi_device *sdev;
736         sdev = to_scsi_device(dev);
737         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
738 }
739
740 static ssize_t
741 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
742                     const char *buf, size_t count)
743 {
744         struct scsi_device *sdev;
745         unsigned int eh_timeout;
746         int err;
747
748         if (!capable(CAP_SYS_ADMIN))
749                 return -EACCES;
750
751         sdev = to_scsi_device(dev);
752         err = kstrtouint(buf, 10, &eh_timeout);
753         if (err)
754                 return err;
755         sdev->eh_timeout = eh_timeout * HZ;
756
757         return count;
758 }
759 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
760
761 static ssize_t
762 store_rescan_field (struct device *dev, struct device_attribute *attr,
763                     const char *buf, size_t count)
764 {
765         scsi_rescan_device(dev);
766         return count;
767 }
768 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
769
770 static ssize_t
771 sdev_store_delete(struct device *dev, struct device_attribute *attr,
772                   const char *buf, size_t count)
773 {
774         struct kernfs_node *kn;
775         struct scsi_device *sdev = to_scsi_device(dev);
776
777         /*
778          * We need to try to get module, avoiding the module been removed
779          * during delete.
780          */
781         if (scsi_device_get(sdev))
782                 return -ENODEV;
783
784         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
785         WARN_ON_ONCE(!kn);
786         /*
787          * Concurrent writes into the "delete" sysfs attribute may trigger
788          * concurrent calls to device_remove_file() and scsi_remove_device().
789          * device_remove_file() handles concurrent removal calls by
790          * serializing these and by ignoring the second and later removal
791          * attempts.  Concurrent calls of scsi_remove_device() are
792          * serialized. The second and later calls of scsi_remove_device() are
793          * ignored because the first call of that function changes the device
794          * state into SDEV_DEL.
795          */
796         device_remove_file(dev, attr);
797         scsi_remove_device(sdev);
798         if (kn)
799                 sysfs_unbreak_active_protection(kn);
800         scsi_device_put(sdev);
801         return count;
802 };
803 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
804
805 static ssize_t
806 store_state_field(struct device *dev, struct device_attribute *attr,
807                   const char *buf, size_t count)
808 {
809         int i, ret;
810         struct scsi_device *sdev = to_scsi_device(dev);
811         enum scsi_device_state state = 0;
812         bool rescan_dev = false;
813
814         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
815                 const int len = strlen(sdev_states[i].name);
816                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
817                    buf[len] == '\n') {
818                         state = sdev_states[i].value;
819                         break;
820                 }
821         }
822         switch (state) {
823         case SDEV_RUNNING:
824         case SDEV_OFFLINE:
825                 break;
826         default:
827                 return -EINVAL;
828         }
829
830         mutex_lock(&sdev->state_mutex);
831         if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
832                 ret = 0;
833         } else {
834                 ret = scsi_device_set_state(sdev, state);
835                 if (ret == 0 && state == SDEV_RUNNING)
836                         rescan_dev = true;
837         }
838         mutex_unlock(&sdev->state_mutex);
839
840         if (rescan_dev) {
841                 /*
842                  * If the device state changes to SDEV_RUNNING, we need to
843                  * run the queue to avoid I/O hang, and rescan the device
844                  * to revalidate it. Running the queue first is necessary
845                  * because another thread may be waiting inside
846                  * blk_mq_freeze_queue_wait() and because that call may be
847                  * waiting for pending I/O to finish.
848                  */
849                 blk_mq_run_hw_queues(sdev->request_queue, true);
850                 scsi_rescan_device(dev);
851         }
852
853         return ret == 0 ? count : -EINVAL;
854 }
855
856 static ssize_t
857 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
858 {
859         struct scsi_device *sdev = to_scsi_device(dev);
860         const char *name = scsi_device_state_name(sdev->sdev_state);
861
862         if (!name)
863                 return -EINVAL;
864
865         return snprintf(buf, 20, "%s\n", name);
866 }
867
868 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
869
870 static ssize_t
871 show_queue_type_field(struct device *dev, struct device_attribute *attr,
872                       char *buf)
873 {
874         struct scsi_device *sdev = to_scsi_device(dev);
875         const char *name = "none";
876
877         if (sdev->simple_tags)
878                 name = "simple";
879
880         return snprintf(buf, 20, "%s\n", name);
881 }
882
883 static ssize_t
884 store_queue_type_field(struct device *dev, struct device_attribute *attr,
885                        const char *buf, size_t count)
886 {
887         struct scsi_device *sdev = to_scsi_device(dev);
888
889         if (!sdev->tagged_supported)
890                 return -EINVAL;
891                 
892         sdev_printk(KERN_INFO, sdev,
893                     "ignoring write to deprecated queue_type attribute");
894         return count;
895 }
896
897 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
898                    store_queue_type_field);
899
900 #define sdev_vpd_pg_attr(_page)                                         \
901 static ssize_t                                                  \
902 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
903                  struct bin_attribute *bin_attr,                        \
904                  char *buf, loff_t off, size_t count)                   \
905 {                                                                       \
906         struct device *dev = kobj_to_dev(kobj);                         \
907         struct scsi_device *sdev = to_scsi_device(dev);                 \
908         struct scsi_vpd *vpd_page;                                      \
909         int ret = -EINVAL;                                              \
910                                                                         \
911         rcu_read_lock();                                                \
912         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
913         if (vpd_page)                                                   \
914                 ret = memory_read_from_buffer(buf, count, &off,         \
915                                 vpd_page->data, vpd_page->len);         \
916         rcu_read_unlock();                                              \
917         return ret;                                                     \
918 }                                                                       \
919 static struct bin_attribute dev_attr_vpd_##_page = {            \
920         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
921         .size = 0,                                                      \
922         .read = show_vpd_##_page,                                       \
923 };
924
925 sdev_vpd_pg_attr(pg83);
926 sdev_vpd_pg_attr(pg80);
927 sdev_vpd_pg_attr(pg89);
928 sdev_vpd_pg_attr(pgb0);
929 sdev_vpd_pg_attr(pgb1);
930 sdev_vpd_pg_attr(pgb2);
931 sdev_vpd_pg_attr(pg0);
932
933 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
934                             struct bin_attribute *bin_attr,
935                             char *buf, loff_t off, size_t count)
936 {
937         struct device *dev = kobj_to_dev(kobj);
938         struct scsi_device *sdev = to_scsi_device(dev);
939
940         if (!sdev->inquiry)
941                 return -EINVAL;
942
943         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
944                                        sdev->inquiry_len);
945 }
946
947 static struct bin_attribute dev_attr_inquiry = {
948         .attr = {
949                 .name = "inquiry",
950                 .mode = S_IRUGO,
951         },
952         .size = 0,
953         .read = show_inquiry,
954 };
955
956 static ssize_t
957 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
958                         char *buf)
959 {
960         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
961 }
962
963 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
964
965 #define show_sdev_iostat(field)                                         \
966 static ssize_t                                                          \
967 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
968                     char *buf)                                          \
969 {                                                                       \
970         struct scsi_device *sdev = to_scsi_device(dev);                 \
971         unsigned long long count = atomic_read(&sdev->field);           \
972         return snprintf(buf, 20, "0x%llx\n", count);                    \
973 }                                                                       \
974 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
975
976 show_sdev_iostat(iorequest_cnt);
977 show_sdev_iostat(iodone_cnt);
978 show_sdev_iostat(ioerr_cnt);
979
980 static ssize_t
981 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
982 {
983         struct scsi_device *sdev;
984         sdev = to_scsi_device(dev);
985         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
986 }
987 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
988
989 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
990 static ssize_t                                                          \
991 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
992                      char *buf)                                         \
993 {                                                                       \
994         struct scsi_device *sdev = to_scsi_device(dev);                 \
995         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
996         return snprintf(buf, 20, "%d\n", val);                          \
997 }
998
999 #define DECLARE_EVT_STORE(name, Cap_name)                               \
1000 static ssize_t                                                          \
1001 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
1002                       const char *buf, size_t count)                    \
1003 {                                                                       \
1004         struct scsi_device *sdev = to_scsi_device(dev);                 \
1005         int val = simple_strtoul(buf, NULL, 0);                         \
1006         if (val == 0)                                                   \
1007                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
1008         else if (val == 1)                                              \
1009                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
1010         else                                                            \
1011                 return -EINVAL;                                         \
1012         return count;                                                   \
1013 }
1014
1015 #define DECLARE_EVT(name, Cap_name)                                     \
1016         DECLARE_EVT_SHOW(name, Cap_name)                                \
1017         DECLARE_EVT_STORE(name, Cap_name)                               \
1018         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
1019                            sdev_store_evt_##name);
1020 #define REF_EVT(name) &dev_attr_evt_##name.attr
1021
1022 DECLARE_EVT(media_change, MEDIA_CHANGE)
1023 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1024 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1025 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1026 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1027 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1028
1029 static ssize_t
1030 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1031                        const char *buf, size_t count)
1032 {
1033         int depth, retval;
1034         struct scsi_device *sdev = to_scsi_device(dev);
1035         struct scsi_host_template *sht = sdev->host->hostt;
1036
1037         if (!sht->change_queue_depth)
1038                 return -EINVAL;
1039
1040         depth = simple_strtoul(buf, NULL, 0);
1041
1042         if (depth < 1 || depth > sdev->host->can_queue)
1043                 return -EINVAL;
1044
1045         retval = sht->change_queue_depth(sdev, depth);
1046         if (retval < 0)
1047                 return retval;
1048
1049         sdev->max_queue_depth = sdev->queue_depth;
1050
1051         return count;
1052 }
1053 sdev_show_function(queue_depth, "%d\n");
1054
1055 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1056                    sdev_store_queue_depth);
1057
1058 static ssize_t
1059 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1060                     char *buf)
1061 {
1062         struct scsi_device *sdev = to_scsi_device(dev);
1063         ssize_t count;
1064
1065         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1066         if (count > 0) {
1067                 buf[count] = '\n';
1068                 count++;
1069         }
1070         return count;
1071 }
1072 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1073
1074 #define BLIST_FLAG_NAME(name)                                   \
1075         [const_ilog2((__force __u64)BLIST_##name)] = #name
1076 static const char *const sdev_bflags_name[] = {
1077 #include "scsi_devinfo_tbl.c"
1078 };
1079 #undef BLIST_FLAG_NAME
1080
1081 static ssize_t
1082 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1083                     char *buf)
1084 {
1085         struct scsi_device *sdev = to_scsi_device(dev);
1086         int i;
1087         ssize_t len = 0;
1088
1089         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1090                 const char *name = NULL;
1091
1092                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1093                         continue;
1094                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1095                         name = sdev_bflags_name[i];
1096
1097                 if (name)
1098                         len += scnprintf(buf + len, PAGE_SIZE - len,
1099                                          "%s%s", len ? " " : "", name);
1100                 else
1101                         len += scnprintf(buf + len, PAGE_SIZE - len,
1102                                          "%sINVALID_BIT(%d)", len ? " " : "", i);
1103         }
1104         if (len)
1105                 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1106         return len;
1107 }
1108 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1109
1110 #ifdef CONFIG_SCSI_DH
1111 static ssize_t
1112 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1113                    char *buf)
1114 {
1115         struct scsi_device *sdev = to_scsi_device(dev);
1116
1117         if (!sdev->handler)
1118                 return snprintf(buf, 20, "detached\n");
1119
1120         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1121 }
1122
1123 static ssize_t
1124 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1125                     const char *buf, size_t count)
1126 {
1127         struct scsi_device *sdev = to_scsi_device(dev);
1128         int err = -EINVAL;
1129
1130         if (sdev->sdev_state == SDEV_CANCEL ||
1131             sdev->sdev_state == SDEV_DEL)
1132                 return -ENODEV;
1133
1134         if (!sdev->handler) {
1135                 /*
1136                  * Attach to a device handler
1137                  */
1138                 err = scsi_dh_attach(sdev->request_queue, buf);
1139         } else if (!strncmp(buf, "activate", 8)) {
1140                 /*
1141                  * Activate a device handler
1142                  */
1143                 if (sdev->handler->activate)
1144                         err = sdev->handler->activate(sdev, NULL, NULL);
1145                 else
1146                         err = 0;
1147         } else if (!strncmp(buf, "detach", 6)) {
1148                 /*
1149                  * Detach from a device handler
1150                  */
1151                 sdev_printk(KERN_WARNING, sdev,
1152                             "can't detach handler %s.\n",
1153                             sdev->handler->name);
1154                 err = -EINVAL;
1155         }
1156
1157         return err < 0 ? err : count;
1158 }
1159
1160 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1161                    sdev_store_dh_state);
1162
1163 static ssize_t
1164 sdev_show_access_state(struct device *dev,
1165                        struct device_attribute *attr,
1166                        char *buf)
1167 {
1168         struct scsi_device *sdev = to_scsi_device(dev);
1169         unsigned char access_state;
1170         const char *access_state_name;
1171
1172         if (!sdev->handler)
1173                 return -EINVAL;
1174
1175         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1176         access_state_name = scsi_access_state_name(access_state);
1177
1178         return sprintf(buf, "%s\n",
1179                        access_state_name ? access_state_name : "unknown");
1180 }
1181 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1182
1183 static ssize_t
1184 sdev_show_preferred_path(struct device *dev,
1185                          struct device_attribute *attr,
1186                          char *buf)
1187 {
1188         struct scsi_device *sdev = to_scsi_device(dev);
1189
1190         if (!sdev->handler)
1191                 return -EINVAL;
1192
1193         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1194                 return sprintf(buf, "1\n");
1195         else
1196                 return sprintf(buf, "0\n");
1197 }
1198 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1199 #endif
1200
1201 static ssize_t
1202 sdev_show_queue_ramp_up_period(struct device *dev,
1203                                struct device_attribute *attr,
1204                                char *buf)
1205 {
1206         struct scsi_device *sdev;
1207         sdev = to_scsi_device(dev);
1208         return snprintf(buf, 20, "%u\n",
1209                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1210 }
1211
1212 static ssize_t
1213 sdev_store_queue_ramp_up_period(struct device *dev,
1214                                 struct device_attribute *attr,
1215                                 const char *buf, size_t count)
1216 {
1217         struct scsi_device *sdev = to_scsi_device(dev);
1218         unsigned int period;
1219
1220         if (kstrtouint(buf, 10, &period))
1221                 return -EINVAL;
1222
1223         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1224         return count;
1225 }
1226
1227 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1228                    sdev_show_queue_ramp_up_period,
1229                    sdev_store_queue_ramp_up_period);
1230
1231 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1232                                          struct attribute *attr, int i)
1233 {
1234         struct device *dev = kobj_to_dev(kobj);
1235         struct scsi_device *sdev = to_scsi_device(dev);
1236
1237
1238         if (attr == &dev_attr_queue_depth.attr &&
1239             !sdev->host->hostt->change_queue_depth)
1240                 return S_IRUGO;
1241
1242         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1243             !sdev->host->hostt->change_queue_depth)
1244                 return 0;
1245
1246         return attr->mode;
1247 }
1248
1249 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1250                                              struct bin_attribute *attr, int i)
1251 {
1252         struct device *dev = kobj_to_dev(kobj);
1253         struct scsi_device *sdev = to_scsi_device(dev);
1254
1255
1256         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1257                 return 0;
1258
1259         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1260                 return 0;
1261
1262         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1263                 return 0;
1264
1265         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1266                 return 0;
1267
1268         if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1269                 return 0;
1270
1271         if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1272                 return 0;
1273
1274         if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1275                 return 0;
1276
1277         return S_IRUGO;
1278 }
1279
1280 /* Default template for device attributes.  May NOT be modified */
1281 static struct attribute *scsi_sdev_attrs[] = {
1282         &dev_attr_device_blocked.attr,
1283         &dev_attr_type.attr,
1284         &dev_attr_scsi_level.attr,
1285         &dev_attr_device_busy.attr,
1286         &dev_attr_vendor.attr,
1287         &dev_attr_model.attr,
1288         &dev_attr_rev.attr,
1289         &dev_attr_rescan.attr,
1290         &dev_attr_delete.attr,
1291         &dev_attr_state.attr,
1292         &dev_attr_timeout.attr,
1293         &dev_attr_eh_timeout.attr,
1294         &dev_attr_iocounterbits.attr,
1295         &dev_attr_iorequest_cnt.attr,
1296         &dev_attr_iodone_cnt.attr,
1297         &dev_attr_ioerr_cnt.attr,
1298         &dev_attr_modalias.attr,
1299         &dev_attr_queue_depth.attr,
1300         &dev_attr_queue_type.attr,
1301         &dev_attr_wwid.attr,
1302         &dev_attr_blacklist.attr,
1303 #ifdef CONFIG_SCSI_DH
1304         &dev_attr_dh_state.attr,
1305         &dev_attr_access_state.attr,
1306         &dev_attr_preferred_path.attr,
1307 #endif
1308         &dev_attr_queue_ramp_up_period.attr,
1309         REF_EVT(media_change),
1310         REF_EVT(inquiry_change_reported),
1311         REF_EVT(capacity_change_reported),
1312         REF_EVT(soft_threshold_reached),
1313         REF_EVT(mode_parameter_change_reported),
1314         REF_EVT(lun_change_reported),
1315         NULL
1316 };
1317
1318 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1319         &dev_attr_vpd_pg0,
1320         &dev_attr_vpd_pg83,
1321         &dev_attr_vpd_pg80,
1322         &dev_attr_vpd_pg89,
1323         &dev_attr_vpd_pgb0,
1324         &dev_attr_vpd_pgb1,
1325         &dev_attr_vpd_pgb2,
1326         &dev_attr_inquiry,
1327         NULL
1328 };
1329 static struct attribute_group scsi_sdev_attr_group = {
1330         .attrs =        scsi_sdev_attrs,
1331         .bin_attrs =    scsi_sdev_bin_attrs,
1332         .is_visible =   scsi_sdev_attr_is_visible,
1333         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1334 };
1335
1336 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1337         &scsi_sdev_attr_group,
1338         NULL
1339 };
1340
1341 static int scsi_target_add(struct scsi_target *starget)
1342 {
1343         int error;
1344
1345         if (starget->state != STARGET_CREATED)
1346                 return 0;
1347
1348         error = device_add(&starget->dev);
1349         if (error) {
1350                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1351                 return error;
1352         }
1353         transport_add_device(&starget->dev);
1354         starget->state = STARGET_RUNNING;
1355
1356         pm_runtime_set_active(&starget->dev);
1357         pm_runtime_enable(&starget->dev);
1358         device_enable_async_suspend(&starget->dev);
1359
1360         return 0;
1361 }
1362
1363 /**
1364  * scsi_sysfs_add_sdev - add scsi device to sysfs
1365  * @sdev:       scsi_device to add
1366  *
1367  * Return value:
1368  *      0 on Success / non-zero on Failure
1369  **/
1370 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1371 {
1372         int error;
1373         struct scsi_target *starget = sdev->sdev_target;
1374
1375         error = scsi_target_add(starget);
1376         if (error)
1377                 return error;
1378
1379         transport_configure_device(&starget->dev);
1380
1381         device_enable_async_suspend(&sdev->sdev_gendev);
1382         scsi_autopm_get_target(starget);
1383         pm_runtime_set_active(&sdev->sdev_gendev);
1384         if (!sdev->rpm_autosuspend)
1385                 pm_runtime_forbid(&sdev->sdev_gendev);
1386         pm_runtime_enable(&sdev->sdev_gendev);
1387         scsi_autopm_put_target(starget);
1388
1389         scsi_autopm_get_device(sdev);
1390
1391         scsi_dh_add_device(sdev);
1392
1393         error = device_add(&sdev->sdev_gendev);
1394         if (error) {
1395                 sdev_printk(KERN_INFO, sdev,
1396                                 "failed to add device: %d\n", error);
1397                 return error;
1398         }
1399
1400         device_enable_async_suspend(&sdev->sdev_dev);
1401         error = device_add(&sdev->sdev_dev);
1402         if (error) {
1403                 sdev_printk(KERN_INFO, sdev,
1404                                 "failed to add class device: %d\n", error);
1405                 device_del(&sdev->sdev_gendev);
1406                 return error;
1407         }
1408         transport_add_device(&sdev->sdev_gendev);
1409         sdev->is_visible = 1;
1410
1411         if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1412                 sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1413                 if (IS_ERR(sdev->bsg_dev)) {
1414                         error = PTR_ERR(sdev->bsg_dev);
1415                         sdev_printk(KERN_INFO, sdev,
1416                                     "Failed to register bsg queue, errno=%d\n",
1417                                     error);
1418                         sdev->bsg_dev = NULL;
1419                 }
1420         }
1421
1422         scsi_autopm_put_device(sdev);
1423         return error;
1424 }
1425
1426 void __scsi_remove_device(struct scsi_device *sdev)
1427 {
1428         struct device *dev = &sdev->sdev_gendev;
1429         int res;
1430
1431         /*
1432          * This cleanup path is not reentrant and while it is impossible
1433          * to get a new reference with scsi_device_get() someone can still
1434          * hold a previously acquired one.
1435          */
1436         if (sdev->sdev_state == SDEV_DEL)
1437                 return;
1438
1439         if (sdev->is_visible) {
1440                 /*
1441                  * If scsi_internal_target_block() is running concurrently,
1442                  * wait until it has finished before changing the device state.
1443                  */
1444                 mutex_lock(&sdev->state_mutex);
1445                 /*
1446                  * If blocked, we go straight to DEL and restart the queue so
1447                  * any commands issued during driver shutdown (like sync
1448                  * cache) are errored immediately.
1449                  */
1450                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1451                 if (res != 0) {
1452                         res = scsi_device_set_state(sdev, SDEV_DEL);
1453                         if (res == 0)
1454                                 scsi_start_queue(sdev);
1455                 }
1456                 mutex_unlock(&sdev->state_mutex);
1457
1458                 if (res != 0)
1459                         return;
1460
1461                 if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1462                         bsg_unregister_queue(sdev->bsg_dev);
1463                 device_unregister(&sdev->sdev_dev);
1464                 transport_remove_device(dev);
1465                 device_del(dev);
1466         } else
1467                 put_device(&sdev->sdev_dev);
1468
1469         /*
1470          * Stop accepting new requests and wait until all queuecommand() and
1471          * scsi_run_queue() invocations have finished before tearing down the
1472          * device.
1473          */
1474         mutex_lock(&sdev->state_mutex);
1475         scsi_device_set_state(sdev, SDEV_DEL);
1476         mutex_unlock(&sdev->state_mutex);
1477
1478         blk_cleanup_queue(sdev->request_queue);
1479         cancel_work_sync(&sdev->requeue_work);
1480
1481         if (sdev->host->hostt->slave_destroy)
1482                 sdev->host->hostt->slave_destroy(sdev);
1483         transport_destroy_device(dev);
1484
1485         /*
1486          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1487          * removed sysfs visibility from the device, so make the target
1488          * invisible if this was the last device underneath it.
1489          */
1490         scsi_target_reap(scsi_target(sdev));
1491
1492         put_device(dev);
1493 }
1494
1495 /**
1496  * scsi_remove_device - unregister a device from the scsi bus
1497  * @sdev:       scsi_device to unregister
1498  **/
1499 void scsi_remove_device(struct scsi_device *sdev)
1500 {
1501         struct Scsi_Host *shost = sdev->host;
1502
1503         mutex_lock(&shost->scan_mutex);
1504         __scsi_remove_device(sdev);
1505         mutex_unlock(&shost->scan_mutex);
1506 }
1507 EXPORT_SYMBOL(scsi_remove_device);
1508
1509 static void __scsi_remove_target(struct scsi_target *starget)
1510 {
1511         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1512         unsigned long flags;
1513         struct scsi_device *sdev;
1514
1515         spin_lock_irqsave(shost->host_lock, flags);
1516  restart:
1517         list_for_each_entry(sdev, &shost->__devices, siblings) {
1518                 /*
1519                  * We cannot call scsi_device_get() here, as
1520                  * we might've been called from rmmod() causing
1521                  * scsi_device_get() to fail the module_is_live()
1522                  * check.
1523                  */
1524                 if (sdev->channel != starget->channel ||
1525                     sdev->id != starget->id)
1526                         continue;
1527                 if (sdev->sdev_state == SDEV_DEL ||
1528                     sdev->sdev_state == SDEV_CANCEL ||
1529                     !get_device(&sdev->sdev_gendev))
1530                         continue;
1531                 spin_unlock_irqrestore(shost->host_lock, flags);
1532                 scsi_remove_device(sdev);
1533                 put_device(&sdev->sdev_gendev);
1534                 spin_lock_irqsave(shost->host_lock, flags);
1535                 goto restart;
1536         }
1537         spin_unlock_irqrestore(shost->host_lock, flags);
1538 }
1539
1540 /**
1541  * scsi_remove_target - try to remove a target and all its devices
1542  * @dev: generic starget or parent of generic stargets to be removed
1543  *
1544  * Note: This is slightly racy.  It is possible that if the user
1545  * requests the addition of another device then the target won't be
1546  * removed.
1547  */
1548 void scsi_remove_target(struct device *dev)
1549 {
1550         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1551         struct scsi_target *starget;
1552         unsigned long flags;
1553
1554 restart:
1555         spin_lock_irqsave(shost->host_lock, flags);
1556         list_for_each_entry(starget, &shost->__targets, siblings) {
1557                 if (starget->state == STARGET_DEL ||
1558                     starget->state == STARGET_REMOVE ||
1559                     starget->state == STARGET_CREATED_REMOVE)
1560                         continue;
1561                 if (starget->dev.parent == dev || &starget->dev == dev) {
1562                         kref_get(&starget->reap_ref);
1563                         if (starget->state == STARGET_CREATED)
1564                                 starget->state = STARGET_CREATED_REMOVE;
1565                         else
1566                                 starget->state = STARGET_REMOVE;
1567                         spin_unlock_irqrestore(shost->host_lock, flags);
1568                         __scsi_remove_target(starget);
1569                         scsi_target_reap(starget);
1570                         goto restart;
1571                 }
1572         }
1573         spin_unlock_irqrestore(shost->host_lock, flags);
1574 }
1575 EXPORT_SYMBOL(scsi_remove_target);
1576
1577 int scsi_register_driver(struct device_driver *drv)
1578 {
1579         drv->bus = &scsi_bus_type;
1580
1581         return driver_register(drv);
1582 }
1583 EXPORT_SYMBOL(scsi_register_driver);
1584
1585 int scsi_register_interface(struct class_interface *intf)
1586 {
1587         intf->class = &sdev_class;
1588
1589         return class_interface_register(intf);
1590 }
1591 EXPORT_SYMBOL(scsi_register_interface);
1592
1593 /**
1594  * scsi_sysfs_add_host - add scsi host to subsystem
1595  * @shost:     scsi host struct to add to subsystem
1596  **/
1597 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1598 {
1599         transport_register_device(&shost->shost_gendev);
1600         transport_configure_device(&shost->shost_gendev);
1601         return 0;
1602 }
1603
1604 static struct device_type scsi_dev_type = {
1605         .name =         "scsi_device",
1606         .release =      scsi_device_dev_release,
1607         .groups =       scsi_sdev_attr_groups,
1608 };
1609
1610 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1611 {
1612         unsigned long flags;
1613         struct Scsi_Host *shost = sdev->host;
1614         struct scsi_host_template *hostt = shost->hostt;
1615         struct scsi_target  *starget = sdev->sdev_target;
1616
1617         device_initialize(&sdev->sdev_gendev);
1618         sdev->sdev_gendev.bus = &scsi_bus_type;
1619         sdev->sdev_gendev.type = &scsi_dev_type;
1620         scsi_enable_async_suspend(&sdev->sdev_gendev);
1621         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1622                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1623         sdev->sdev_gendev.groups = hostt->sdev_groups;
1624
1625         device_initialize(&sdev->sdev_dev);
1626         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1627         sdev->sdev_dev.class = &sdev_class;
1628         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1629                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1630         /*
1631          * Get a default scsi_level from the target (derived from sibling
1632          * devices).  This is the best we can do for guessing how to set
1633          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1634          * setting doesn't matter, because all the bits are zero anyway.
1635          * But it does matter for higher LUNs.
1636          */
1637         sdev->scsi_level = starget->scsi_level;
1638         if (sdev->scsi_level <= SCSI_2 &&
1639                         sdev->scsi_level != SCSI_UNKNOWN &&
1640                         !shost->no_scsi2_lun_in_cdb)
1641                 sdev->lun_in_cdb = 1;
1642
1643         transport_setup_device(&sdev->sdev_gendev);
1644         spin_lock_irqsave(shost->host_lock, flags);
1645         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1646         list_add_tail(&sdev->siblings, &shost->__devices);
1647         spin_unlock_irqrestore(shost->host_lock, flags);
1648         /*
1649          * device can now only be removed via __scsi_remove_device() so hold
1650          * the target.  Target will be held in CREATED state until something
1651          * beneath it becomes visible (in which case it moves to RUNNING)
1652          */
1653         kref_get(&starget->reap_ref);
1654 }
1655
1656 int scsi_is_sdev_device(const struct device *dev)
1657 {
1658         return dev->type == &scsi_dev_type;
1659 }
1660 EXPORT_SYMBOL(scsi_is_sdev_device);
1661
1662 /* A blank transport template that is used in drivers that don't
1663  * yet implement Transport Attributes */
1664 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };