GNU Linux-libre 5.10.219-gnu1
[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
17 #include <scsi/scsi.h>
18 #include <scsi/scsi_device.h>
19 #include <scsi/scsi_host.h>
20 #include <scsi/scsi_tcq.h>
21 #include <scsi/scsi_dh.h>
22 #include <scsi/scsi_transport.h>
23 #include <scsi/scsi_driver.h>
24 #include <scsi/scsi_devinfo.h>
25
26 #include "scsi_priv.h"
27 #include "scsi_logging.h"
28
29 static struct device_type scsi_dev_type;
30
31 static const struct {
32         enum scsi_device_state  value;
33         char                    *name;
34 } sdev_states[] = {
35         { SDEV_CREATED, "created" },
36         { SDEV_RUNNING, "running" },
37         { SDEV_CANCEL, "cancel" },
38         { SDEV_DEL, "deleted" },
39         { SDEV_QUIESCE, "quiesce" },
40         { SDEV_OFFLINE, "offline" },
41         { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
42         { SDEV_BLOCK,   "blocked" },
43         { SDEV_CREATED_BLOCK, "created-blocked" },
44 };
45
46 const char *scsi_device_state_name(enum scsi_device_state state)
47 {
48         int i;
49         char *name = NULL;
50
51         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
52                 if (sdev_states[i].value == state) {
53                         name = sdev_states[i].name;
54                         break;
55                 }
56         }
57         return name;
58 }
59
60 static const struct {
61         enum scsi_host_state    value;
62         char                    *name;
63 } shost_states[] = {
64         { SHOST_CREATED, "created" },
65         { SHOST_RUNNING, "running" },
66         { SHOST_CANCEL, "cancel" },
67         { SHOST_DEL, "deleted" },
68         { SHOST_RECOVERY, "recovery" },
69         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
70         { SHOST_DEL_RECOVERY, "deleted/recovery", },
71 };
72 const char *scsi_host_state_name(enum scsi_host_state state)
73 {
74         int i;
75         char *name = NULL;
76
77         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
78                 if (shost_states[i].value == state) {
79                         name = shost_states[i].name;
80                         break;
81                 }
82         }
83         return name;
84 }
85
86 #ifdef CONFIG_SCSI_DH
87 static const struct {
88         unsigned char   value;
89         char            *name;
90 } sdev_access_states[] = {
91         { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
92         { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
93         { SCSI_ACCESS_STATE_STANDBY, "standby" },
94         { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
95         { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
96         { SCSI_ACCESS_STATE_OFFLINE, "offline" },
97         { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
98 };
99
100 static const char *scsi_access_state_name(unsigned char state)
101 {
102         int i;
103         char *name = NULL;
104
105         for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
106                 if (sdev_access_states[i].value == state) {
107                         name = sdev_access_states[i].name;
108                         break;
109                 }
110         }
111         return name;
112 }
113 #endif
114
115 static int check_set(unsigned long long *val, char *src)
116 {
117         char *last;
118
119         if (strcmp(src, "-") == 0) {
120                 *val = SCAN_WILD_CARD;
121         } else {
122                 /*
123                  * Doesn't check for int overflow
124                  */
125                 *val = simple_strtoull(src, &last, 0);
126                 if (*last != '\0')
127                         return 1;
128         }
129         return 0;
130 }
131
132 static int scsi_scan(struct Scsi_Host *shost, const char *str)
133 {
134         char s1[15], s2[15], s3[17], junk;
135         unsigned long long channel, id, lun;
136         int res;
137
138         res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
139         if (res != 3)
140                 return -EINVAL;
141         if (check_set(&channel, s1))
142                 return -EINVAL;
143         if (check_set(&id, s2))
144                 return -EINVAL;
145         if (check_set(&lun, s3))
146                 return -EINVAL;
147         if (shost->transportt->user_scan)
148                 res = shost->transportt->user_scan(shost, channel, id, lun);
149         else
150                 res = scsi_scan_host_selected(shost, channel, id, lun,
151                                               SCSI_SCAN_MANUAL);
152         return res;
153 }
154
155 /*
156  * shost_show_function: macro to create an attr function that can be used to
157  * show a non-bit field.
158  */
159 #define shost_show_function(name, field, format_string)                 \
160 static ssize_t                                                          \
161 show_##name (struct device *dev, struct device_attribute *attr,         \
162              char *buf)                                                 \
163 {                                                                       \
164         struct Scsi_Host *shost = class_to_shost(dev);                  \
165         return snprintf (buf, 20, format_string, shost->field);         \
166 }
167
168 /*
169  * shost_rd_attr: macro to create a function and attribute variable for a
170  * read only field.
171  */
172 #define shost_rd_attr2(name, field, format_string)                      \
173         shost_show_function(name, field, format_string)                 \
174 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
175
176 #define shost_rd_attr(field, format_string) \
177 shost_rd_attr2(field, field, format_string)
178
179 /*
180  * Create the actual show/store functions and data structures.
181  */
182
183 static ssize_t
184 store_scan(struct device *dev, struct device_attribute *attr,
185            const char *buf, size_t count)
186 {
187         struct Scsi_Host *shost = class_to_shost(dev);
188         int res;
189
190         res = scsi_scan(shost, buf);
191         if (res == 0)
192                 res = count;
193         return res;
194 };
195 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
196
197 static ssize_t
198 store_shost_state(struct device *dev, struct device_attribute *attr,
199                   const char *buf, size_t count)
200 {
201         int i;
202         struct Scsi_Host *shost = class_to_shost(dev);
203         enum scsi_host_state state = 0;
204
205         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
206                 const int len = strlen(shost_states[i].name);
207                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
208                    buf[len] == '\n') {
209                         state = shost_states[i].value;
210                         break;
211                 }
212         }
213         if (!state)
214                 return -EINVAL;
215
216         if (scsi_host_set_state(shost, state))
217                 return -EINVAL;
218         return count;
219 }
220
221 static ssize_t
222 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
223 {
224         struct Scsi_Host *shost = class_to_shost(dev);
225         const char *name = scsi_host_state_name(shost->shost_state);
226
227         if (!name)
228                 return -EINVAL;
229
230         return snprintf(buf, 20, "%s\n", name);
231 }
232
233 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
234 static struct device_attribute dev_attr_hstate =
235         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
236
237 static ssize_t
238 show_shost_mode(unsigned int mode, char *buf)
239 {
240         ssize_t len = 0;
241
242         if (mode & MODE_INITIATOR)
243                 len = sprintf(buf, "%s", "Initiator");
244
245         if (mode & MODE_TARGET)
246                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
247
248         len += sprintf(buf + len, "\n");
249
250         return len;
251 }
252
253 static ssize_t
254 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
255                           char *buf)
256 {
257         struct Scsi_Host *shost = class_to_shost(dev);
258         unsigned int supported_mode = shost->hostt->supported_mode;
259
260         if (supported_mode == MODE_UNKNOWN)
261                 /* by default this should be initiator */
262                 supported_mode = MODE_INITIATOR;
263
264         return show_shost_mode(supported_mode, buf);
265 }
266
267 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
268
269 static ssize_t
270 show_shost_active_mode(struct device *dev,
271                        struct device_attribute *attr, char *buf)
272 {
273         struct Scsi_Host *shost = class_to_shost(dev);
274
275         if (shost->active_mode == MODE_UNKNOWN)
276                 return snprintf(buf, 20, "unknown\n");
277         else
278                 return show_shost_mode(shost->active_mode, buf);
279 }
280
281 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
282
283 static int check_reset_type(const char *str)
284 {
285         if (sysfs_streq(str, "adapter"))
286                 return SCSI_ADAPTER_RESET;
287         else if (sysfs_streq(str, "firmware"))
288                 return SCSI_FIRMWARE_RESET;
289         else
290                 return 0;
291 }
292
293 static ssize_t
294 store_host_reset(struct device *dev, struct device_attribute *attr,
295                 const char *buf, size_t count)
296 {
297         struct Scsi_Host *shost = class_to_shost(dev);
298         struct scsi_host_template *sht = shost->hostt;
299         int ret = -EINVAL;
300         int type;
301
302         type = check_reset_type(buf);
303         if (!type)
304                 goto exit_store_host_reset;
305
306         if (sht->host_reset)
307                 ret = sht->host_reset(shost, type);
308         else
309                 ret = -EOPNOTSUPP;
310
311 exit_store_host_reset:
312         if (ret == 0)
313                 ret = count;
314         return ret;
315 }
316
317 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
318
319 static ssize_t
320 show_shost_eh_deadline(struct device *dev,
321                       struct device_attribute *attr, char *buf)
322 {
323         struct Scsi_Host *shost = class_to_shost(dev);
324
325         if (shost->eh_deadline == -1)
326                 return snprintf(buf, strlen("off") + 2, "off\n");
327         return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
328 }
329
330 static ssize_t
331 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
332                 const char *buf, size_t count)
333 {
334         struct Scsi_Host *shost = class_to_shost(dev);
335         int ret = -EINVAL;
336         unsigned long deadline, flags;
337
338         if (shost->transportt &&
339             (shost->transportt->eh_strategy_handler ||
340              !shost->hostt->eh_host_reset_handler))
341                 return ret;
342
343         if (!strncmp(buf, "off", strlen("off")))
344                 deadline = -1;
345         else {
346                 ret = kstrtoul(buf, 10, &deadline);
347                 if (ret)
348                         return ret;
349                 if (deadline * HZ > UINT_MAX)
350                         return -EINVAL;
351         }
352
353         spin_lock_irqsave(shost->host_lock, flags);
354         if (scsi_host_in_recovery(shost))
355                 ret = -EBUSY;
356         else {
357                 if (deadline == -1)
358                         shost->eh_deadline = -1;
359                 else
360                         shost->eh_deadline = deadline * HZ;
361
362                 ret = count;
363         }
364         spin_unlock_irqrestore(shost->host_lock, flags);
365
366         return ret;
367 }
368
369 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
370
371 shost_rd_attr(unique_id, "%u\n");
372 shost_rd_attr(cmd_per_lun, "%hd\n");
373 shost_rd_attr(can_queue, "%hd\n");
374 shost_rd_attr(sg_tablesize, "%hu\n");
375 shost_rd_attr(sg_prot_tablesize, "%hu\n");
376 shost_rd_attr(unchecked_isa_dma, "%d\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_unchecked_isa_dma.attr,
415         &dev_attr_proc_name.attr,
416         &dev_attr_scan.attr,
417         &dev_attr_hstate.attr,
418         &dev_attr_supported_mode.attr,
419         &dev_attr_active_mode.attr,
420         &dev_attr_prot_capabilities.attr,
421         &dev_attr_prot_guard_type.attr,
422         &dev_attr_host_reset.attr,
423         &dev_attr_eh_deadline.attr,
424         &dev_attr_nr_hw_queues.attr,
425         NULL
426 };
427
428 static struct attribute_group scsi_shost_attr_group = {
429         .attrs =        scsi_sysfs_shost_attrs,
430 };
431
432 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
433         &scsi_shost_attr_group,
434         NULL
435 };
436
437 static void scsi_device_cls_release(struct device *class_dev)
438 {
439         struct scsi_device *sdev;
440
441         sdev = class_to_sdev(class_dev);
442         put_device(&sdev->sdev_gendev);
443 }
444
445 static void scsi_device_dev_release_usercontext(struct work_struct *work)
446 {
447         struct scsi_device *sdev;
448         struct device *parent;
449         struct list_head *this, *tmp;
450         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
451         struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
452         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         mutex_lock(&sdev->inquiry_mutex);
484         vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
485                                        lockdep_is_held(&sdev->inquiry_mutex));
486         vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
487                                        lockdep_is_held(&sdev->inquiry_mutex));
488         vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
489                                        lockdep_is_held(&sdev->inquiry_mutex));
490         vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
491                                        lockdep_is_held(&sdev->inquiry_mutex));
492         mutex_unlock(&sdev->inquiry_mutex);
493
494         if (vpd_pg0)
495                 kfree_rcu(vpd_pg0, rcu);
496         if (vpd_pg83)
497                 kfree_rcu(vpd_pg83, rcu);
498         if (vpd_pg80)
499                 kfree_rcu(vpd_pg80, rcu);
500         if (vpd_pg89)
501                 kfree_rcu(vpd_pg89, rcu);
502         kfree(sdev->inquiry);
503         kfree(sdev);
504
505         if (parent)
506                 put_device(parent);
507         module_put(mod);
508 }
509
510 static void scsi_device_dev_release(struct device *dev)
511 {
512         struct scsi_device *sdp = to_scsi_device(dev);
513
514         /* Set module pointer as NULL in case of module unloading */
515         if (!try_module_get(sdp->host->hostt->module))
516                 sdp->host->hostt->module = NULL;
517
518         execute_in_process_context(scsi_device_dev_release_usercontext,
519                                    &sdp->ew);
520 }
521
522 static struct class sdev_class = {
523         .name           = "scsi_device",
524         .dev_release    = scsi_device_cls_release,
525 };
526
527 /* all probing is done in the individual ->probe routines */
528 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
529 {
530         struct scsi_device *sdp;
531
532         if (dev->type != &scsi_dev_type)
533                 return 0;
534
535         sdp = to_scsi_device(dev);
536         if (sdp->no_uld_attach)
537                 return 0;
538         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
539 }
540
541 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
542 {
543         struct scsi_device *sdev;
544
545         if (dev->type != &scsi_dev_type)
546                 return 0;
547
548         sdev = to_scsi_device(dev);
549
550         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
551         return 0;
552 }
553
554 struct bus_type scsi_bus_type = {
555         .name           = "scsi",
556         .match          = scsi_bus_match,
557         .uevent         = scsi_bus_uevent,
558 #ifdef CONFIG_PM
559         .pm             = &scsi_bus_pm_ops,
560 #endif
561 };
562 EXPORT_SYMBOL_GPL(scsi_bus_type);
563
564 int scsi_sysfs_register(void)
565 {
566         int error;
567
568         error = bus_register(&scsi_bus_type);
569         if (!error) {
570                 error = class_register(&sdev_class);
571                 if (error)
572                         bus_unregister(&scsi_bus_type);
573         }
574
575         return error;
576 }
577
578 void scsi_sysfs_unregister(void)
579 {
580         class_unregister(&sdev_class);
581         bus_unregister(&scsi_bus_type);
582 }
583
584 /*
585  * sdev_show_function: macro to create an attr function that can be used to
586  * show a non-bit field.
587  */
588 #define sdev_show_function(field, format_string)                                \
589 static ssize_t                                                          \
590 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
591                    char *buf)                                           \
592 {                                                                       \
593         struct scsi_device *sdev;                                       \
594         sdev = to_scsi_device(dev);                                     \
595         return snprintf (buf, 20, format_string, sdev->field);          \
596 }                                                                       \
597
598 /*
599  * sdev_rd_attr: macro to create a function and attribute variable for a
600  * read only field.
601  */
602 #define sdev_rd_attr(field, format_string)                              \
603         sdev_show_function(field, format_string)                        \
604 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
605
606
607 /*
608  * sdev_rw_attr: create a function and attribute variable for a
609  * read/write field.
610  */
611 #define sdev_rw_attr(field, format_string)                              \
612         sdev_show_function(field, format_string)                                \
613                                                                         \
614 static ssize_t                                                          \
615 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
616                     const char *buf, size_t count)                      \
617 {                                                                       \
618         struct scsi_device *sdev;                                       \
619         sdev = to_scsi_device(dev);                                     \
620         sscanf (buf, format_string, &sdev->field);                      \
621         return count;                                                   \
622 }                                                                       \
623 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
624
625 /* Currently we don't export bit fields, but we might in future,
626  * so leave this code in */
627 #if 0
628 /*
629  * sdev_rd_attr: create a function and attribute variable for a
630  * read/write bit field.
631  */
632 #define sdev_rw_attr_bit(field)                                         \
633         sdev_show_function(field, "%d\n")                                       \
634                                                                         \
635 static ssize_t                                                          \
636 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
637                     const char *buf, size_t count)                      \
638 {                                                                       \
639         int ret;                                                        \
640         struct scsi_device *sdev;                                       \
641         ret = scsi_sdev_check_buf_bit(buf);                             \
642         if (ret >= 0)   {                                               \
643                 sdev = to_scsi_device(dev);                             \
644                 sdev->field = ret;                                      \
645                 ret = count;                                            \
646         }                                                               \
647         return ret;                                                     \
648 }                                                                       \
649 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
650
651 /*
652  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
653  * else return -EINVAL.
654  */
655 static int scsi_sdev_check_buf_bit(const char *buf)
656 {
657         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
658                 if (buf[0] == '1')
659                         return 1;
660                 else if (buf[0] == '0')
661                         return 0;
662                 else 
663                         return -EINVAL;
664         } else
665                 return -EINVAL;
666 }
667 #endif
668 /*
669  * Create the actual show/store functions and data structures.
670  */
671 sdev_rd_attr (type, "%d\n");
672 sdev_rd_attr (scsi_level, "%d\n");
673 sdev_rd_attr (vendor, "%.8s\n");
674 sdev_rd_attr (model, "%.16s\n");
675 sdev_rd_attr (rev, "%.4s\n");
676
677 static ssize_t
678 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
679                 char *buf)
680 {
681         struct scsi_device *sdev = to_scsi_device(dev);
682         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
683 }
684 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
685
686 static ssize_t
687 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
688                 char *buf)
689 {
690         struct scsi_device *sdev = to_scsi_device(dev);
691         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
692 }
693 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
694
695 /*
696  * TODO: can we make these symlinks to the block layer ones?
697  */
698 static ssize_t
699 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
700 {
701         struct scsi_device *sdev;
702         sdev = to_scsi_device(dev);
703         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
704 }
705
706 static ssize_t
707 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
708                     const char *buf, size_t count)
709 {
710         struct scsi_device *sdev;
711         int timeout;
712         sdev = to_scsi_device(dev);
713         sscanf (buf, "%d\n", &timeout);
714         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
715         return count;
716 }
717 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
718
719 static ssize_t
720 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
721 {
722         struct scsi_device *sdev;
723         sdev = to_scsi_device(dev);
724         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
725 }
726
727 static ssize_t
728 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
729                     const char *buf, size_t count)
730 {
731         struct scsi_device *sdev;
732         unsigned int eh_timeout;
733         int err;
734
735         if (!capable(CAP_SYS_ADMIN))
736                 return -EACCES;
737
738         sdev = to_scsi_device(dev);
739         err = kstrtouint(buf, 10, &eh_timeout);
740         if (err)
741                 return err;
742         sdev->eh_timeout = eh_timeout * HZ;
743
744         return count;
745 }
746 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
747
748 static ssize_t
749 store_rescan_field (struct device *dev, struct device_attribute *attr,
750                     const char *buf, size_t count)
751 {
752         scsi_rescan_device(dev);
753         return count;
754 }
755 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
756
757 static ssize_t
758 sdev_store_delete(struct device *dev, struct device_attribute *attr,
759                   const char *buf, size_t count)
760 {
761         struct kernfs_node *kn;
762         struct scsi_device *sdev = to_scsi_device(dev);
763
764         /*
765          * We need to try to get module, avoiding the module been removed
766          * during delete.
767          */
768         if (scsi_device_get(sdev))
769                 return -ENODEV;
770
771         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
772         WARN_ON_ONCE(!kn);
773         /*
774          * Concurrent writes into the "delete" sysfs attribute may trigger
775          * concurrent calls to device_remove_file() and scsi_remove_device().
776          * device_remove_file() handles concurrent removal calls by
777          * serializing these and by ignoring the second and later removal
778          * attempts.  Concurrent calls of scsi_remove_device() are
779          * serialized. The second and later calls of scsi_remove_device() are
780          * ignored because the first call of that function changes the device
781          * state into SDEV_DEL.
782          */
783         device_remove_file(dev, attr);
784         scsi_remove_device(sdev);
785         if (kn)
786                 sysfs_unbreak_active_protection(kn);
787         scsi_device_put(sdev);
788         return count;
789 };
790 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
791
792 static ssize_t
793 store_state_field(struct device *dev, struct device_attribute *attr,
794                   const char *buf, size_t count)
795 {
796         int i, ret;
797         struct scsi_device *sdev = to_scsi_device(dev);
798         enum scsi_device_state state = 0;
799         bool rescan_dev = false;
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         switch (sdev->sdev_state) {
819         case SDEV_RUNNING:
820         case SDEV_OFFLINE:
821                 break;
822         default:
823                 mutex_unlock(&sdev->state_mutex);
824                 return -EINVAL;
825         }
826         if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
827                 ret = 0;
828         } else {
829                 ret = scsi_device_set_state(sdev, state);
830                 if (ret == 0 && state == SDEV_RUNNING)
831                         rescan_dev = true;
832         }
833         mutex_unlock(&sdev->state_mutex);
834
835         if (rescan_dev) {
836                 /*
837                  * If the device state changes to SDEV_RUNNING, we need to
838                  * run the queue to avoid I/O hang, and rescan the device
839                  * to revalidate it. Running the queue first is necessary
840                  * because another thread may be waiting inside
841                  * blk_mq_freeze_queue_wait() and because that call may be
842                  * waiting for pending I/O to finish.
843                  */
844                 blk_mq_run_hw_queues(sdev->request_queue, true);
845                 scsi_rescan_device(dev);
846         }
847
848         return ret == 0 ? count : -EINVAL;
849 }
850
851 static ssize_t
852 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
853 {
854         struct scsi_device *sdev = to_scsi_device(dev);
855         const char *name = scsi_device_state_name(sdev->sdev_state);
856
857         if (!name)
858                 return -EINVAL;
859
860         return snprintf(buf, 20, "%s\n", name);
861 }
862
863 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
864
865 static ssize_t
866 show_queue_type_field(struct device *dev, struct device_attribute *attr,
867                       char *buf)
868 {
869         struct scsi_device *sdev = to_scsi_device(dev);
870         const char *name = "none";
871
872         if (sdev->simple_tags)
873                 name = "simple";
874
875         return snprintf(buf, 20, "%s\n", name);
876 }
877
878 static ssize_t
879 store_queue_type_field(struct device *dev, struct device_attribute *attr,
880                        const char *buf, size_t count)
881 {
882         struct scsi_device *sdev = to_scsi_device(dev);
883
884         if (!sdev->tagged_supported)
885                 return -EINVAL;
886                 
887         sdev_printk(KERN_INFO, sdev,
888                     "ignoring write to deprecated queue_type attribute");
889         return count;
890 }
891
892 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
893                    store_queue_type_field);
894
895 #define sdev_vpd_pg_attr(_page)                                         \
896 static ssize_t                                                  \
897 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
898                  struct bin_attribute *bin_attr,                        \
899                  char *buf, loff_t off, size_t count)                   \
900 {                                                                       \
901         struct device *dev = kobj_to_dev(kobj);                         \
902         struct scsi_device *sdev = to_scsi_device(dev);                 \
903         struct scsi_vpd *vpd_page;                                      \
904         int ret = -EINVAL;                                              \
905                                                                         \
906         rcu_read_lock();                                                \
907         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
908         if (vpd_page)                                                   \
909                 ret = memory_read_from_buffer(buf, count, &off,         \
910                                 vpd_page->data, vpd_page->len);         \
911         rcu_read_unlock();                                              \
912         return ret;                                                     \
913 }                                                                       \
914 static struct bin_attribute dev_attr_vpd_##_page = {            \
915         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
916         .size = 0,                                                      \
917         .read = show_vpd_##_page,                                       \
918 };
919
920 sdev_vpd_pg_attr(pg83);
921 sdev_vpd_pg_attr(pg80);
922 sdev_vpd_pg_attr(pg89);
923 sdev_vpd_pg_attr(pg0);
924
925 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
926                             struct bin_attribute *bin_attr,
927                             char *buf, loff_t off, size_t count)
928 {
929         struct device *dev = kobj_to_dev(kobj);
930         struct scsi_device *sdev = to_scsi_device(dev);
931
932         if (!sdev->inquiry)
933                 return -EINVAL;
934
935         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
936                                        sdev->inquiry_len);
937 }
938
939 static struct bin_attribute dev_attr_inquiry = {
940         .attr = {
941                 .name = "inquiry",
942                 .mode = S_IRUGO,
943         },
944         .size = 0,
945         .read = show_inquiry,
946 };
947
948 static ssize_t
949 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
950                         char *buf)
951 {
952         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
953 }
954
955 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
956
957 #define show_sdev_iostat(field)                                         \
958 static ssize_t                                                          \
959 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
960                     char *buf)                                          \
961 {                                                                       \
962         struct scsi_device *sdev = to_scsi_device(dev);                 \
963         unsigned long long count = atomic_read(&sdev->field);           \
964         return snprintf(buf, 20, "0x%llx\n", count);                    \
965 }                                                                       \
966 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
967
968 show_sdev_iostat(iorequest_cnt);
969 show_sdev_iostat(iodone_cnt);
970 show_sdev_iostat(ioerr_cnt);
971
972 static ssize_t
973 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
974 {
975         struct scsi_device *sdev;
976         sdev = to_scsi_device(dev);
977         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
978 }
979 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
980
981 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
982 static ssize_t                                                          \
983 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
984                      char *buf)                                         \
985 {                                                                       \
986         struct scsi_device *sdev = to_scsi_device(dev);                 \
987         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
988         return snprintf(buf, 20, "%d\n", val);                          \
989 }
990
991 #define DECLARE_EVT_STORE(name, Cap_name)                               \
992 static ssize_t                                                          \
993 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
994                       const char *buf, size_t count)                    \
995 {                                                                       \
996         struct scsi_device *sdev = to_scsi_device(dev);                 \
997         int val = simple_strtoul(buf, NULL, 0);                         \
998         if (val == 0)                                                   \
999                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
1000         else if (val == 1)                                              \
1001                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
1002         else                                                            \
1003                 return -EINVAL;                                         \
1004         return count;                                                   \
1005 }
1006
1007 #define DECLARE_EVT(name, Cap_name)                                     \
1008         DECLARE_EVT_SHOW(name, Cap_name)                                \
1009         DECLARE_EVT_STORE(name, Cap_name)                               \
1010         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
1011                            sdev_store_evt_##name);
1012 #define REF_EVT(name) &dev_attr_evt_##name.attr
1013
1014 DECLARE_EVT(media_change, MEDIA_CHANGE)
1015 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1016 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1017 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1018 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1019 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1020
1021 static ssize_t
1022 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1023                        const char *buf, size_t count)
1024 {
1025         int depth, retval;
1026         struct scsi_device *sdev = to_scsi_device(dev);
1027         struct scsi_host_template *sht = sdev->host->hostt;
1028
1029         if (!sht->change_queue_depth)
1030                 return -EINVAL;
1031
1032         depth = simple_strtoul(buf, NULL, 0);
1033
1034         if (depth < 1 || depth > sdev->host->can_queue)
1035                 return -EINVAL;
1036
1037         retval = sht->change_queue_depth(sdev, depth);
1038         if (retval < 0)
1039                 return retval;
1040
1041         sdev->max_queue_depth = sdev->queue_depth;
1042
1043         return count;
1044 }
1045 sdev_show_function(queue_depth, "%d\n");
1046
1047 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1048                    sdev_store_queue_depth);
1049
1050 static ssize_t
1051 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1052                     char *buf)
1053 {
1054         struct scsi_device *sdev = to_scsi_device(dev);
1055         ssize_t count;
1056
1057         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1058         if (count > 0) {
1059                 buf[count] = '\n';
1060                 count++;
1061         }
1062         return count;
1063 }
1064 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1065
1066 #define BLIST_FLAG_NAME(name)                                   \
1067         [const_ilog2((__force __u64)BLIST_##name)] = #name
1068 static const char *const sdev_bflags_name[] = {
1069 #include "scsi_devinfo_tbl.c"
1070 };
1071 #undef BLIST_FLAG_NAME
1072
1073 static ssize_t
1074 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1075                     char *buf)
1076 {
1077         struct scsi_device *sdev = to_scsi_device(dev);
1078         int i;
1079         ssize_t len = 0;
1080
1081         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1082                 const char *name = NULL;
1083
1084                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1085                         continue;
1086                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1087                         name = sdev_bflags_name[i];
1088
1089                 if (name)
1090                         len += scnprintf(buf + len, PAGE_SIZE - len,
1091                                          "%s%s", len ? " " : "", name);
1092                 else
1093                         len += scnprintf(buf + len, PAGE_SIZE - len,
1094                                          "%sINVALID_BIT(%d)", len ? " " : "", i);
1095         }
1096         if (len)
1097                 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1098         return len;
1099 }
1100 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1101
1102 #ifdef CONFIG_SCSI_DH
1103 static ssize_t
1104 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1105                    char *buf)
1106 {
1107         struct scsi_device *sdev = to_scsi_device(dev);
1108
1109         if (!sdev->handler)
1110                 return snprintf(buf, 20, "detached\n");
1111
1112         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1113 }
1114
1115 static ssize_t
1116 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1117                     const char *buf, size_t count)
1118 {
1119         struct scsi_device *sdev = to_scsi_device(dev);
1120         int err = -EINVAL;
1121
1122         if (sdev->sdev_state == SDEV_CANCEL ||
1123             sdev->sdev_state == SDEV_DEL)
1124                 return -ENODEV;
1125
1126         if (!sdev->handler) {
1127                 /*
1128                  * Attach to a device handler
1129                  */
1130                 err = scsi_dh_attach(sdev->request_queue, buf);
1131         } else if (!strncmp(buf, "activate", 8)) {
1132                 /*
1133                  * Activate a device handler
1134                  */
1135                 if (sdev->handler->activate)
1136                         err = sdev->handler->activate(sdev, NULL, NULL);
1137                 else
1138                         err = 0;
1139         } else if (!strncmp(buf, "detach", 6)) {
1140                 /*
1141                  * Detach from a device handler
1142                  */
1143                 sdev_printk(KERN_WARNING, sdev,
1144                             "can't detach handler %s.\n",
1145                             sdev->handler->name);
1146                 err = -EINVAL;
1147         }
1148
1149         return err < 0 ? err : count;
1150 }
1151
1152 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1153                    sdev_store_dh_state);
1154
1155 static ssize_t
1156 sdev_show_access_state(struct device *dev,
1157                        struct device_attribute *attr,
1158                        char *buf)
1159 {
1160         struct scsi_device *sdev = to_scsi_device(dev);
1161         unsigned char access_state;
1162         const char *access_state_name;
1163
1164         if (!sdev->handler)
1165                 return -EINVAL;
1166
1167         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1168         access_state_name = scsi_access_state_name(access_state);
1169
1170         return sprintf(buf, "%s\n",
1171                        access_state_name ? access_state_name : "unknown");
1172 }
1173 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1174
1175 static ssize_t
1176 sdev_show_preferred_path(struct device *dev,
1177                          struct device_attribute *attr,
1178                          char *buf)
1179 {
1180         struct scsi_device *sdev = to_scsi_device(dev);
1181
1182         if (!sdev->handler)
1183                 return -EINVAL;
1184
1185         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1186                 return sprintf(buf, "1\n");
1187         else
1188                 return sprintf(buf, "0\n");
1189 }
1190 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1191 #endif
1192
1193 static ssize_t
1194 sdev_show_queue_ramp_up_period(struct device *dev,
1195                                struct device_attribute *attr,
1196                                char *buf)
1197 {
1198         struct scsi_device *sdev;
1199         sdev = to_scsi_device(dev);
1200         return snprintf(buf, 20, "%u\n",
1201                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1202 }
1203
1204 static ssize_t
1205 sdev_store_queue_ramp_up_period(struct device *dev,
1206                                 struct device_attribute *attr,
1207                                 const char *buf, size_t count)
1208 {
1209         struct scsi_device *sdev = to_scsi_device(dev);
1210         unsigned int period;
1211
1212         if (kstrtouint(buf, 10, &period))
1213                 return -EINVAL;
1214
1215         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1216         return count;
1217 }
1218
1219 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1220                    sdev_show_queue_ramp_up_period,
1221                    sdev_store_queue_ramp_up_period);
1222
1223 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1224                                          struct attribute *attr, int i)
1225 {
1226         struct device *dev = kobj_to_dev(kobj);
1227         struct scsi_device *sdev = to_scsi_device(dev);
1228
1229
1230         if (attr == &dev_attr_queue_depth.attr &&
1231             !sdev->host->hostt->change_queue_depth)
1232                 return S_IRUGO;
1233
1234         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1235             !sdev->host->hostt->change_queue_depth)
1236                 return 0;
1237
1238 #ifdef CONFIG_SCSI_DH
1239         if (attr == &dev_attr_access_state.attr &&
1240             !sdev->handler)
1241                 return 0;
1242         if (attr == &dev_attr_preferred_path.attr &&
1243             !sdev->handler)
1244                 return 0;
1245 #endif
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         return S_IRUGO;
1269 }
1270
1271 /* Default template for device attributes.  May NOT be modified */
1272 static struct attribute *scsi_sdev_attrs[] = {
1273         &dev_attr_device_blocked.attr,
1274         &dev_attr_type.attr,
1275         &dev_attr_scsi_level.attr,
1276         &dev_attr_device_busy.attr,
1277         &dev_attr_vendor.attr,
1278         &dev_attr_model.attr,
1279         &dev_attr_rev.attr,
1280         &dev_attr_rescan.attr,
1281         &dev_attr_delete.attr,
1282         &dev_attr_state.attr,
1283         &dev_attr_timeout.attr,
1284         &dev_attr_eh_timeout.attr,
1285         &dev_attr_iocounterbits.attr,
1286         &dev_attr_iorequest_cnt.attr,
1287         &dev_attr_iodone_cnt.attr,
1288         &dev_attr_ioerr_cnt.attr,
1289         &dev_attr_modalias.attr,
1290         &dev_attr_queue_depth.attr,
1291         &dev_attr_queue_type.attr,
1292         &dev_attr_wwid.attr,
1293         &dev_attr_blacklist.attr,
1294 #ifdef CONFIG_SCSI_DH
1295         &dev_attr_dh_state.attr,
1296         &dev_attr_access_state.attr,
1297         &dev_attr_preferred_path.attr,
1298 #endif
1299         &dev_attr_queue_ramp_up_period.attr,
1300         REF_EVT(media_change),
1301         REF_EVT(inquiry_change_reported),
1302         REF_EVT(capacity_change_reported),
1303         REF_EVT(soft_threshold_reached),
1304         REF_EVT(mode_parameter_change_reported),
1305         REF_EVT(lun_change_reported),
1306         NULL
1307 };
1308
1309 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1310         &dev_attr_vpd_pg0,
1311         &dev_attr_vpd_pg83,
1312         &dev_attr_vpd_pg80,
1313         &dev_attr_vpd_pg89,
1314         &dev_attr_inquiry,
1315         NULL
1316 };
1317 static struct attribute_group scsi_sdev_attr_group = {
1318         .attrs =        scsi_sdev_attrs,
1319         .bin_attrs =    scsi_sdev_bin_attrs,
1320         .is_visible =   scsi_sdev_attr_is_visible,
1321         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1322 };
1323
1324 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1325         &scsi_sdev_attr_group,
1326         NULL
1327 };
1328
1329 static int scsi_target_add(struct scsi_target *starget)
1330 {
1331         int error;
1332
1333         if (starget->state != STARGET_CREATED)
1334                 return 0;
1335
1336         error = device_add(&starget->dev);
1337         if (error) {
1338                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1339                 return error;
1340         }
1341         transport_add_device(&starget->dev);
1342         starget->state = STARGET_RUNNING;
1343
1344         pm_runtime_set_active(&starget->dev);
1345         pm_runtime_enable(&starget->dev);
1346         device_enable_async_suspend(&starget->dev);
1347
1348         return 0;
1349 }
1350
1351 /**
1352  * scsi_sysfs_add_sdev - add scsi device to sysfs
1353  * @sdev:       scsi_device to add
1354  *
1355  * Return value:
1356  *      0 on Success / non-zero on Failure
1357  **/
1358 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1359 {
1360         int error, i;
1361         struct request_queue *rq = sdev->request_queue;
1362         struct scsi_target *starget = sdev->sdev_target;
1363
1364         error = scsi_target_add(starget);
1365         if (error)
1366                 return error;
1367
1368         transport_configure_device(&starget->dev);
1369
1370         device_enable_async_suspend(&sdev->sdev_gendev);
1371         scsi_autopm_get_target(starget);
1372         pm_runtime_set_active(&sdev->sdev_gendev);
1373         if (!sdev->rpm_autosuspend)
1374                 pm_runtime_forbid(&sdev->sdev_gendev);
1375         pm_runtime_enable(&sdev->sdev_gendev);
1376         scsi_autopm_put_target(starget);
1377
1378         scsi_autopm_get_device(sdev);
1379
1380         scsi_dh_add_device(sdev);
1381
1382         error = device_add(&sdev->sdev_gendev);
1383         if (error) {
1384                 sdev_printk(KERN_INFO, sdev,
1385                                 "failed to add device: %d\n", error);
1386                 return error;
1387         }
1388
1389         device_enable_async_suspend(&sdev->sdev_dev);
1390         error = device_add(&sdev->sdev_dev);
1391         if (error) {
1392                 sdev_printk(KERN_INFO, sdev,
1393                                 "failed to add class device: %d\n", error);
1394                 device_del(&sdev->sdev_gendev);
1395                 return error;
1396         }
1397         transport_add_device(&sdev->sdev_gendev);
1398         sdev->is_visible = 1;
1399
1400         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1401         if (error)
1402                 /* we're treating error on bsg register as non-fatal,
1403                  * so pretend nothing went wrong */
1404                 sdev_printk(KERN_INFO, sdev,
1405                             "Failed to register bsg queue, errno=%d\n", error);
1406
1407         /* add additional host specific attributes */
1408         if (sdev->host->hostt->sdev_attrs) {
1409                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1410                         error = device_create_file(&sdev->sdev_gendev,
1411                                         sdev->host->hostt->sdev_attrs[i]);
1412                         if (error)
1413                                 return error;
1414                 }
1415         }
1416
1417         if (sdev->host->hostt->sdev_groups) {
1418                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1419                                 sdev->host->hostt->sdev_groups);
1420                 if (error)
1421                         return error;
1422         }
1423
1424         scsi_autopm_put_device(sdev);
1425         return error;
1426 }
1427
1428 void __scsi_remove_device(struct scsi_device *sdev)
1429 {
1430         struct device *dev = &sdev->sdev_gendev;
1431         int res;
1432
1433         /*
1434          * This cleanup path is not reentrant and while it is impossible
1435          * to get a new reference with scsi_device_get() someone can still
1436          * hold a previously acquired one.
1437          */
1438         if (sdev->sdev_state == SDEV_DEL)
1439                 return;
1440
1441         if (sdev->is_visible) {
1442                 /*
1443                  * If scsi_internal_target_block() is running concurrently,
1444                  * wait until it has finished before changing the device state.
1445                  */
1446                 mutex_lock(&sdev->state_mutex);
1447                 /*
1448                  * If blocked, we go straight to DEL and restart the queue so
1449                  * any commands issued during driver shutdown (like sync
1450                  * cache) are errored immediately.
1451                  */
1452                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1453                 if (res != 0) {
1454                         res = scsi_device_set_state(sdev, SDEV_DEL);
1455                         if (res == 0)
1456                                 scsi_start_queue(sdev);
1457                 }
1458                 mutex_unlock(&sdev->state_mutex);
1459
1460                 if (res != 0)
1461                         return;
1462
1463                 if (sdev->host->hostt->sdev_groups)
1464                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1465                                         sdev->host->hostt->sdev_groups);
1466
1467                 bsg_unregister_queue(sdev->request_queue);
1468                 device_unregister(&sdev->sdev_dev);
1469                 transport_remove_device(dev);
1470                 device_del(dev);
1471         } else
1472                 put_device(&sdev->sdev_dev);
1473
1474         /*
1475          * Stop accepting new requests and wait until all queuecommand() and
1476          * scsi_run_queue() invocations have finished before tearing down the
1477          * device.
1478          */
1479         mutex_lock(&sdev->state_mutex);
1480         scsi_device_set_state(sdev, SDEV_DEL);
1481         mutex_unlock(&sdev->state_mutex);
1482
1483         blk_cleanup_queue(sdev->request_queue);
1484         cancel_work_sync(&sdev->requeue_work);
1485
1486         if (sdev->host->hostt->slave_destroy)
1487                 sdev->host->hostt->slave_destroy(sdev);
1488         transport_destroy_device(dev);
1489
1490         /*
1491          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1492          * remoed sysfs visibility from the device, so make the target
1493          * invisible if this was the last device underneath it.
1494          */
1495         scsi_target_reap(scsi_target(sdev));
1496
1497         put_device(dev);
1498 }
1499
1500 /**
1501  * scsi_remove_device - unregister a device from the scsi bus
1502  * @sdev:       scsi_device to unregister
1503  **/
1504 void scsi_remove_device(struct scsi_device *sdev)
1505 {
1506         struct Scsi_Host *shost = sdev->host;
1507
1508         mutex_lock(&shost->scan_mutex);
1509         __scsi_remove_device(sdev);
1510         mutex_unlock(&shost->scan_mutex);
1511 }
1512 EXPORT_SYMBOL(scsi_remove_device);
1513
1514 static void __scsi_remove_target(struct scsi_target *starget)
1515 {
1516         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1517         unsigned long flags;
1518         struct scsi_device *sdev;
1519
1520         spin_lock_irqsave(shost->host_lock, flags);
1521  restart:
1522         list_for_each_entry(sdev, &shost->__devices, siblings) {
1523                 /*
1524                  * We cannot call scsi_device_get() here, as
1525                  * we might've been called from rmmod() causing
1526                  * scsi_device_get() to fail the module_is_live()
1527                  * check.
1528                  */
1529                 if (sdev->channel != starget->channel ||
1530                     sdev->id != starget->id)
1531                         continue;
1532                 if (sdev->sdev_state == SDEV_DEL ||
1533                     sdev->sdev_state == SDEV_CANCEL ||
1534                     !get_device(&sdev->sdev_gendev))
1535                         continue;
1536                 spin_unlock_irqrestore(shost->host_lock, flags);
1537                 scsi_remove_device(sdev);
1538                 put_device(&sdev->sdev_gendev);
1539                 spin_lock_irqsave(shost->host_lock, flags);
1540                 goto restart;
1541         }
1542         spin_unlock_irqrestore(shost->host_lock, flags);
1543 }
1544
1545 /**
1546  * scsi_remove_target - try to remove a target and all its devices
1547  * @dev: generic starget or parent of generic stargets to be removed
1548  *
1549  * Note: This is slightly racy.  It is possible that if the user
1550  * requests the addition of another device then the target won't be
1551  * removed.
1552  */
1553 void scsi_remove_target(struct device *dev)
1554 {
1555         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1556         struct scsi_target *starget;
1557         unsigned long flags;
1558
1559 restart:
1560         spin_lock_irqsave(shost->host_lock, flags);
1561         list_for_each_entry(starget, &shost->__targets, siblings) {
1562                 if (starget->state == STARGET_DEL ||
1563                     starget->state == STARGET_REMOVE ||
1564                     starget->state == STARGET_CREATED_REMOVE)
1565                         continue;
1566                 if (starget->dev.parent == dev || &starget->dev == dev) {
1567                         kref_get(&starget->reap_ref);
1568                         if (starget->state == STARGET_CREATED)
1569                                 starget->state = STARGET_CREATED_REMOVE;
1570                         else
1571                                 starget->state = STARGET_REMOVE;
1572                         spin_unlock_irqrestore(shost->host_lock, flags);
1573                         __scsi_remove_target(starget);
1574                         scsi_target_reap(starget);
1575                         goto restart;
1576                 }
1577         }
1578         spin_unlock_irqrestore(shost->host_lock, flags);
1579 }
1580 EXPORT_SYMBOL(scsi_remove_target);
1581
1582 int scsi_register_driver(struct device_driver *drv)
1583 {
1584         drv->bus = &scsi_bus_type;
1585
1586         return driver_register(drv);
1587 }
1588 EXPORT_SYMBOL(scsi_register_driver);
1589
1590 int scsi_register_interface(struct class_interface *intf)
1591 {
1592         intf->class = &sdev_class;
1593
1594         return class_interface_register(intf);
1595 }
1596 EXPORT_SYMBOL(scsi_register_interface);
1597
1598 /**
1599  * scsi_sysfs_add_host - add scsi host to subsystem
1600  * @shost:     scsi host struct to add to subsystem
1601  **/
1602 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1603 {
1604         int error, i;
1605
1606         /* add host specific attributes */
1607         if (shost->hostt->shost_attrs) {
1608                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1609                         error = device_create_file(&shost->shost_dev,
1610                                         shost->hostt->shost_attrs[i]);
1611                         if (error)
1612                                 return error;
1613                 }
1614         }
1615
1616         transport_register_device(&shost->shost_gendev);
1617         transport_configure_device(&shost->shost_gendev);
1618         return 0;
1619 }
1620
1621 static struct device_type scsi_dev_type = {
1622         .name =         "scsi_device",
1623         .release =      scsi_device_dev_release,
1624         .groups =       scsi_sdev_attr_groups,
1625 };
1626
1627 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1628 {
1629         unsigned long flags;
1630         struct Scsi_Host *shost = sdev->host;
1631         struct scsi_target  *starget = sdev->sdev_target;
1632
1633         device_initialize(&sdev->sdev_gendev);
1634         sdev->sdev_gendev.bus = &scsi_bus_type;
1635         sdev->sdev_gendev.type = &scsi_dev_type;
1636         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1637                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1638
1639         device_initialize(&sdev->sdev_dev);
1640         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1641         sdev->sdev_dev.class = &sdev_class;
1642         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1643                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1644         /*
1645          * Get a default scsi_level from the target (derived from sibling
1646          * devices).  This is the best we can do for guessing how to set
1647          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1648          * setting doesn't matter, because all the bits are zero anyway.
1649          * But it does matter for higher LUNs.
1650          */
1651         sdev->scsi_level = starget->scsi_level;
1652         if (sdev->scsi_level <= SCSI_2 &&
1653                         sdev->scsi_level != SCSI_UNKNOWN &&
1654                         !shost->no_scsi2_lun_in_cdb)
1655                 sdev->lun_in_cdb = 1;
1656
1657         transport_setup_device(&sdev->sdev_gendev);
1658         spin_lock_irqsave(shost->host_lock, flags);
1659         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1660         list_add_tail(&sdev->siblings, &shost->__devices);
1661         spin_unlock_irqrestore(shost->host_lock, flags);
1662         /*
1663          * device can now only be removed via __scsi_remove_device() so hold
1664          * the target.  Target will be held in CREATED state until something
1665          * beneath it becomes visible (in which case it moves to RUNNING)
1666          */
1667         kref_get(&starget->reap_ref);
1668 }
1669
1670 int scsi_is_sdev_device(const struct device *dev)
1671 {
1672         return dev->type == &scsi_dev_type;
1673 }
1674 EXPORT_SYMBOL(scsi_is_sdev_device);
1675
1676 /* A blank transport template that is used in drivers that don't
1677  * yet implement Transport Attributes */
1678 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };