GNU Linux-libre 4.19.268-gnu1
[releases.git] / drivers / scsi / scsi_sysfs.c
1 /*
2  * scsi_sysfs.c
3  *
4  * SCSI sysfs interface routines.
5  *
6  * Created to pull SCSI mid layer sysfs routines into one file.
7  */
8
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/init.h>
12 #include <linux/blkdev.h>
13 #include <linux/device.h>
14 #include <linux/pm_runtime.h>
15
16 #include <scsi/scsi.h>
17 #include <scsi/scsi_device.h>
18 #include <scsi/scsi_host.h>
19 #include <scsi/scsi_tcq.h>
20 #include <scsi/scsi_dh.h>
21 #include <scsi/scsi_transport.h>
22 #include <scsi/scsi_driver.h>
23 #include <scsi/scsi_devinfo.h>
24
25 #include "scsi_priv.h"
26 #include "scsi_logging.h"
27
28 static struct device_type scsi_dev_type;
29
30 static const struct {
31         enum scsi_device_state  value;
32         char                    *name;
33 } sdev_states[] = {
34         { SDEV_CREATED, "created" },
35         { SDEV_RUNNING, "running" },
36         { SDEV_CANCEL, "cancel" },
37         { SDEV_DEL, "deleted" },
38         { SDEV_QUIESCE, "quiesce" },
39         { SDEV_OFFLINE, "offline" },
40         { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
41         { SDEV_BLOCK,   "blocked" },
42         { SDEV_CREATED_BLOCK, "created-blocked" },
43 };
44
45 const char *scsi_device_state_name(enum scsi_device_state state)
46 {
47         int i;
48         char *name = NULL;
49
50         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
51                 if (sdev_states[i].value == state) {
52                         name = sdev_states[i].name;
53                         break;
54                 }
55         }
56         return name;
57 }
58
59 static const struct {
60         enum scsi_host_state    value;
61         char                    *name;
62 } shost_states[] = {
63         { SHOST_CREATED, "created" },
64         { SHOST_RUNNING, "running" },
65         { SHOST_CANCEL, "cancel" },
66         { SHOST_DEL, "deleted" },
67         { SHOST_RECOVERY, "recovery" },
68         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
69         { SHOST_DEL_RECOVERY, "deleted/recovery", },
70 };
71 const char *scsi_host_state_name(enum scsi_host_state state)
72 {
73         int i;
74         char *name = NULL;
75
76         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
77                 if (shost_states[i].value == state) {
78                         name = shost_states[i].name;
79                         break;
80                 }
81         }
82         return name;
83 }
84
85 #ifdef CONFIG_SCSI_DH
86 static const struct {
87         unsigned char   value;
88         char            *name;
89 } sdev_access_states[] = {
90         { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
91         { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
92         { SCSI_ACCESS_STATE_STANDBY, "standby" },
93         { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
94         { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
95         { SCSI_ACCESS_STATE_OFFLINE, "offline" },
96         { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
97 };
98
99 static const char *scsi_access_state_name(unsigned char state)
100 {
101         int i;
102         char *name = NULL;
103
104         for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
105                 if (sdev_access_states[i].value == state) {
106                         name = sdev_access_states[i].name;
107                         break;
108                 }
109         }
110         return name;
111 }
112 #endif
113
114 static int check_set(unsigned long long *val, char *src)
115 {
116         char *last;
117
118         if (strcmp(src, "-") == 0) {
119                 *val = SCAN_WILD_CARD;
120         } else {
121                 /*
122                  * Doesn't check for int overflow
123                  */
124                 *val = simple_strtoull(src, &last, 0);
125                 if (*last != '\0')
126                         return 1;
127         }
128         return 0;
129 }
130
131 static int scsi_scan(struct Scsi_Host *shost, const char *str)
132 {
133         char s1[15], s2[15], s3[17], junk;
134         unsigned long long channel, id, lun;
135         int res;
136
137         res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
138         if (res != 3)
139                 return -EINVAL;
140         if (check_set(&channel, s1))
141                 return -EINVAL;
142         if (check_set(&id, s2))
143                 return -EINVAL;
144         if (check_set(&lun, s3))
145                 return -EINVAL;
146         if (shost->transportt->user_scan)
147                 res = shost->transportt->user_scan(shost, channel, id, lun);
148         else
149                 res = scsi_scan_host_selected(shost, channel, id, lun,
150                                               SCSI_SCAN_MANUAL);
151         return res;
152 }
153
154 /*
155  * shost_show_function: macro to create an attr function that can be used to
156  * show a non-bit field.
157  */
158 #define shost_show_function(name, field, format_string)                 \
159 static ssize_t                                                          \
160 show_##name (struct device *dev, struct device_attribute *attr,         \
161              char *buf)                                                 \
162 {                                                                       \
163         struct Scsi_Host *shost = class_to_shost(dev);                  \
164         return snprintf (buf, 20, format_string, shost->field);         \
165 }
166
167 /*
168  * shost_rd_attr: macro to create a function and attribute variable for a
169  * read only field.
170  */
171 #define shost_rd_attr2(name, field, format_string)                      \
172         shost_show_function(name, field, format_string)                 \
173 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
174
175 #define shost_rd_attr(field, format_string) \
176 shost_rd_attr2(field, field, format_string)
177
178 /*
179  * Create the actual show/store functions and data structures.
180  */
181
182 static ssize_t
183 store_scan(struct device *dev, struct device_attribute *attr,
184            const char *buf, size_t count)
185 {
186         struct Scsi_Host *shost = class_to_shost(dev);
187         int res;
188
189         res = scsi_scan(shost, buf);
190         if (res == 0)
191                 res = count;
192         return res;
193 };
194 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
195
196 static ssize_t
197 store_shost_state(struct device *dev, struct device_attribute *attr,
198                   const char *buf, size_t count)
199 {
200         int i;
201         struct Scsi_Host *shost = class_to_shost(dev);
202         enum scsi_host_state state = 0;
203
204         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
205                 const int len = strlen(shost_states[i].name);
206                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
207                    buf[len] == '\n') {
208                         state = shost_states[i].value;
209                         break;
210                 }
211         }
212         if (!state)
213                 return -EINVAL;
214
215         if (scsi_host_set_state(shost, state))
216                 return -EINVAL;
217         return count;
218 }
219
220 static ssize_t
221 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
222 {
223         struct Scsi_Host *shost = class_to_shost(dev);
224         const char *name = scsi_host_state_name(shost->shost_state);
225
226         if (!name)
227                 return -EINVAL;
228
229         return snprintf(buf, 20, "%s\n", name);
230 }
231
232 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
233 static struct device_attribute dev_attr_hstate =
234         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
235
236 static ssize_t
237 show_shost_mode(unsigned int mode, char *buf)
238 {
239         ssize_t len = 0;
240
241         if (mode & MODE_INITIATOR)
242                 len = sprintf(buf, "%s", "Initiator");
243
244         if (mode & MODE_TARGET)
245                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
246
247         len += sprintf(buf + len, "\n");
248
249         return len;
250 }
251
252 static ssize_t
253 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
254                           char *buf)
255 {
256         struct Scsi_Host *shost = class_to_shost(dev);
257         unsigned int supported_mode = shost->hostt->supported_mode;
258
259         if (supported_mode == MODE_UNKNOWN)
260                 /* by default this should be initiator */
261                 supported_mode = MODE_INITIATOR;
262
263         return show_shost_mode(supported_mode, buf);
264 }
265
266 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
267
268 static ssize_t
269 show_shost_active_mode(struct device *dev,
270                        struct device_attribute *attr, char *buf)
271 {
272         struct Scsi_Host *shost = class_to_shost(dev);
273
274         if (shost->active_mode == MODE_UNKNOWN)
275                 return snprintf(buf, 20, "unknown\n");
276         else
277                 return show_shost_mode(shost->active_mode, buf);
278 }
279
280 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
281
282 static int check_reset_type(const char *str)
283 {
284         if (sysfs_streq(str, "adapter"))
285                 return SCSI_ADAPTER_RESET;
286         else if (sysfs_streq(str, "firmware"))
287                 return SCSI_FIRMWARE_RESET;
288         else
289                 return 0;
290 }
291
292 static ssize_t
293 store_host_reset(struct device *dev, struct device_attribute *attr,
294                 const char *buf, size_t count)
295 {
296         struct Scsi_Host *shost = class_to_shost(dev);
297         struct scsi_host_template *sht = shost->hostt;
298         int ret = -EINVAL;
299         int type;
300
301         type = check_reset_type(buf);
302         if (!type)
303                 goto exit_store_host_reset;
304
305         if (sht->host_reset)
306                 ret = sht->host_reset(shost, type);
307         else
308                 ret = -EOPNOTSUPP;
309
310 exit_store_host_reset:
311         if (ret == 0)
312                 ret = count;
313         return ret;
314 }
315
316 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
317
318 static ssize_t
319 show_shost_eh_deadline(struct device *dev,
320                       struct device_attribute *attr, char *buf)
321 {
322         struct Scsi_Host *shost = class_to_shost(dev);
323
324         if (shost->eh_deadline == -1)
325                 return snprintf(buf, strlen("off") + 2, "off\n");
326         return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
327 }
328
329 static ssize_t
330 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
331                 const char *buf, size_t count)
332 {
333         struct Scsi_Host *shost = class_to_shost(dev);
334         int ret = -EINVAL;
335         unsigned long deadline, flags;
336
337         if (shost->transportt &&
338             (shost->transportt->eh_strategy_handler ||
339              !shost->hostt->eh_host_reset_handler))
340                 return ret;
341
342         if (!strncmp(buf, "off", strlen("off")))
343                 deadline = -1;
344         else {
345                 ret = kstrtoul(buf, 10, &deadline);
346                 if (ret)
347                         return ret;
348                 if (deadline * HZ > UINT_MAX)
349                         return -EINVAL;
350         }
351
352         spin_lock_irqsave(shost->host_lock, flags);
353         if (scsi_host_in_recovery(shost))
354                 ret = -EBUSY;
355         else {
356                 if (deadline == -1)
357                         shost->eh_deadline = -1;
358                 else
359                         shost->eh_deadline = deadline * HZ;
360
361                 ret = count;
362         }
363         spin_unlock_irqrestore(shost->host_lock, flags);
364
365         return ret;
366 }
367
368 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
369
370 shost_rd_attr(use_blk_mq, "%d\n");
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 struct attribute *scsi_sysfs_shost_attrs[] = {
390         &dev_attr_use_blk_mq.attr,
391         &dev_attr_unique_id.attr,
392         &dev_attr_host_busy.attr,
393         &dev_attr_cmd_per_lun.attr,
394         &dev_attr_can_queue.attr,
395         &dev_attr_sg_tablesize.attr,
396         &dev_attr_sg_prot_tablesize.attr,
397         &dev_attr_unchecked_isa_dma.attr,
398         &dev_attr_proc_name.attr,
399         &dev_attr_scan.attr,
400         &dev_attr_hstate.attr,
401         &dev_attr_supported_mode.attr,
402         &dev_attr_active_mode.attr,
403         &dev_attr_prot_capabilities.attr,
404         &dev_attr_prot_guard_type.attr,
405         &dev_attr_host_reset.attr,
406         &dev_attr_eh_deadline.attr,
407         NULL
408 };
409
410 static struct attribute_group scsi_shost_attr_group = {
411         .attrs =        scsi_sysfs_shost_attrs,
412 };
413
414 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
415         &scsi_shost_attr_group,
416         NULL
417 };
418
419 static void scsi_device_cls_release(struct device *class_dev)
420 {
421         struct scsi_device *sdev;
422
423         sdev = class_to_sdev(class_dev);
424         put_device(&sdev->sdev_gendev);
425 }
426
427 static void scsi_device_dev_release_usercontext(struct work_struct *work)
428 {
429         struct scsi_device *sdev;
430         struct device *parent;
431         struct list_head *this, *tmp;
432         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
433         unsigned long flags;
434         struct module *mod;
435
436         sdev = container_of(work, struct scsi_device, ew.work);
437
438         mod = sdev->host->hostt->module;
439
440         scsi_dh_release_device(sdev);
441
442         parent = sdev->sdev_gendev.parent;
443
444         spin_lock_irqsave(sdev->host->host_lock, flags);
445         list_del(&sdev->siblings);
446         list_del(&sdev->same_target_siblings);
447         list_del(&sdev->starved_entry);
448         spin_unlock_irqrestore(sdev->host->host_lock, flags);
449
450         cancel_work_sync(&sdev->event_work);
451
452         list_for_each_safe(this, tmp, &sdev->event_list) {
453                 struct scsi_event *evt;
454
455                 evt = list_entry(this, struct scsi_event, node);
456                 list_del(&evt->node);
457                 kfree(evt);
458         }
459
460         blk_put_queue(sdev->request_queue);
461         /* NULL queue means the device can't be used */
462         sdev->request_queue = NULL;
463
464         mutex_lock(&sdev->inquiry_mutex);
465         rcu_swap_protected(sdev->vpd_pg80, vpd_pg80,
466                            lockdep_is_held(&sdev->inquiry_mutex));
467         rcu_swap_protected(sdev->vpd_pg83, vpd_pg83,
468                            lockdep_is_held(&sdev->inquiry_mutex));
469         mutex_unlock(&sdev->inquiry_mutex);
470
471         if (vpd_pg83)
472                 kfree_rcu(vpd_pg83, rcu);
473         if (vpd_pg80)
474                 kfree_rcu(vpd_pg80, rcu);
475         kfree(sdev->inquiry);
476         kfree(sdev);
477
478         if (parent)
479                 put_device(parent);
480         module_put(mod);
481 }
482
483 static void scsi_device_dev_release(struct device *dev)
484 {
485         struct scsi_device *sdp = to_scsi_device(dev);
486
487         /* Set module pointer as NULL in case of module unloading */
488         if (!try_module_get(sdp->host->hostt->module))
489                 sdp->host->hostt->module = NULL;
490
491         execute_in_process_context(scsi_device_dev_release_usercontext,
492                                    &sdp->ew);
493 }
494
495 static struct class sdev_class = {
496         .name           = "scsi_device",
497         .dev_release    = scsi_device_cls_release,
498 };
499
500 /* all probing is done in the individual ->probe routines */
501 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
502 {
503         struct scsi_device *sdp;
504
505         if (dev->type != &scsi_dev_type)
506                 return 0;
507
508         sdp = to_scsi_device(dev);
509         if (sdp->no_uld_attach)
510                 return 0;
511         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
512 }
513
514 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
515 {
516         struct scsi_device *sdev;
517
518         if (dev->type != &scsi_dev_type)
519                 return 0;
520
521         sdev = to_scsi_device(dev);
522
523         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
524         return 0;
525 }
526
527 struct bus_type scsi_bus_type = {
528         .name           = "scsi",
529         .match          = scsi_bus_match,
530         .uevent         = scsi_bus_uevent,
531 #ifdef CONFIG_PM
532         .pm             = &scsi_bus_pm_ops,
533 #endif
534 };
535 EXPORT_SYMBOL_GPL(scsi_bus_type);
536
537 int scsi_sysfs_register(void)
538 {
539         int error;
540
541         error = bus_register(&scsi_bus_type);
542         if (!error) {
543                 error = class_register(&sdev_class);
544                 if (error)
545                         bus_unregister(&scsi_bus_type);
546         }
547
548         return error;
549 }
550
551 void scsi_sysfs_unregister(void)
552 {
553         class_unregister(&sdev_class);
554         bus_unregister(&scsi_bus_type);
555 }
556
557 /*
558  * sdev_show_function: macro to create an attr function that can be used to
559  * show a non-bit field.
560  */
561 #define sdev_show_function(field, format_string)                                \
562 static ssize_t                                                          \
563 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
564                    char *buf)                                           \
565 {                                                                       \
566         struct scsi_device *sdev;                                       \
567         sdev = to_scsi_device(dev);                                     \
568         return snprintf (buf, 20, format_string, sdev->field);          \
569 }                                                                       \
570
571 /*
572  * sdev_rd_attr: macro to create a function and attribute variable for a
573  * read only field.
574  */
575 #define sdev_rd_attr(field, format_string)                              \
576         sdev_show_function(field, format_string)                        \
577 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
578
579
580 /*
581  * sdev_rw_attr: create a function and attribute variable for a
582  * read/write field.
583  */
584 #define sdev_rw_attr(field, format_string)                              \
585         sdev_show_function(field, format_string)                                \
586                                                                         \
587 static ssize_t                                                          \
588 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
589                     const char *buf, size_t count)                      \
590 {                                                                       \
591         struct scsi_device *sdev;                                       \
592         sdev = to_scsi_device(dev);                                     \
593         sscanf (buf, format_string, &sdev->field);                      \
594         return count;                                                   \
595 }                                                                       \
596 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
597
598 /* Currently we don't export bit fields, but we might in future,
599  * so leave this code in */
600 #if 0
601 /*
602  * sdev_rd_attr: create a function and attribute variable for a
603  * read/write bit field.
604  */
605 #define sdev_rw_attr_bit(field)                                         \
606         sdev_show_function(field, "%d\n")                                       \
607                                                                         \
608 static ssize_t                                                          \
609 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
610                     const char *buf, size_t count)                      \
611 {                                                                       \
612         int ret;                                                        \
613         struct scsi_device *sdev;                                       \
614         ret = scsi_sdev_check_buf_bit(buf);                             \
615         if (ret >= 0)   {                                               \
616                 sdev = to_scsi_device(dev);                             \
617                 sdev->field = ret;                                      \
618                 ret = count;                                            \
619         }                                                               \
620         return ret;                                                     \
621 }                                                                       \
622 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
623
624 /*
625  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
626  * else return -EINVAL.
627  */
628 static int scsi_sdev_check_buf_bit(const char *buf)
629 {
630         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
631                 if (buf[0] == '1')
632                         return 1;
633                 else if (buf[0] == '0')
634                         return 0;
635                 else 
636                         return -EINVAL;
637         } else
638                 return -EINVAL;
639 }
640 #endif
641 /*
642  * Create the actual show/store functions and data structures.
643  */
644 sdev_rd_attr (type, "%d\n");
645 sdev_rd_attr (scsi_level, "%d\n");
646 sdev_rd_attr (vendor, "%.8s\n");
647 sdev_rd_attr (model, "%.16s\n");
648 sdev_rd_attr (rev, "%.4s\n");
649
650 static ssize_t
651 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
652                 char *buf)
653 {
654         struct scsi_device *sdev = to_scsi_device(dev);
655         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
656 }
657 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
658
659 static ssize_t
660 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
661                 char *buf)
662 {
663         struct scsi_device *sdev = to_scsi_device(dev);
664         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
665 }
666 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
667
668 /*
669  * TODO: can we make these symlinks to the block layer ones?
670  */
671 static ssize_t
672 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
673 {
674         struct scsi_device *sdev;
675         sdev = to_scsi_device(dev);
676         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
677 }
678
679 static ssize_t
680 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
681                     const char *buf, size_t count)
682 {
683         struct scsi_device *sdev;
684         int timeout;
685         sdev = to_scsi_device(dev);
686         sscanf (buf, "%d\n", &timeout);
687         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
688         return count;
689 }
690 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
691
692 static ssize_t
693 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
694 {
695         struct scsi_device *sdev;
696         sdev = to_scsi_device(dev);
697         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
698 }
699
700 static ssize_t
701 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
702                     const char *buf, size_t count)
703 {
704         struct scsi_device *sdev;
705         unsigned int eh_timeout;
706         int err;
707
708         if (!capable(CAP_SYS_ADMIN))
709                 return -EACCES;
710
711         sdev = to_scsi_device(dev);
712         err = kstrtouint(buf, 10, &eh_timeout);
713         if (err)
714                 return err;
715         sdev->eh_timeout = eh_timeout * HZ;
716
717         return count;
718 }
719 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
720
721 static ssize_t
722 store_rescan_field (struct device *dev, struct device_attribute *attr,
723                     const char *buf, size_t count)
724 {
725         scsi_rescan_device(dev);
726         return count;
727 }
728 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
729
730 static ssize_t
731 sdev_store_delete(struct device *dev, struct device_attribute *attr,
732                   const char *buf, size_t count)
733 {
734         struct kernfs_node *kn;
735         struct scsi_device *sdev = to_scsi_device(dev);
736
737         /*
738          * We need to try to get module, avoiding the module been removed
739          * during delete.
740          */
741         if (scsi_device_get(sdev))
742                 return -ENODEV;
743
744         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
745         WARN_ON_ONCE(!kn);
746         /*
747          * Concurrent writes into the "delete" sysfs attribute may trigger
748          * concurrent calls to device_remove_file() and scsi_remove_device().
749          * device_remove_file() handles concurrent removal calls by
750          * serializing these and by ignoring the second and later removal
751          * attempts.  Concurrent calls of scsi_remove_device() are
752          * serialized. The second and later calls of scsi_remove_device() are
753          * ignored because the first call of that function changes the device
754          * state into SDEV_DEL.
755          */
756         device_remove_file(dev, attr);
757         scsi_remove_device(sdev);
758         if (kn)
759                 sysfs_unbreak_active_protection(kn);
760         scsi_device_put(sdev);
761         return count;
762 };
763 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
764
765 static ssize_t
766 store_state_field(struct device *dev, struct device_attribute *attr,
767                   const char *buf, size_t count)
768 {
769         int i, ret;
770         struct scsi_device *sdev = to_scsi_device(dev);
771         enum scsi_device_state state = 0;
772
773         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
774                 const int len = strlen(sdev_states[i].name);
775                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
776                    buf[len] == '\n') {
777                         state = sdev_states[i].value;
778                         break;
779                 }
780         }
781         if (!state)
782                 return -EINVAL;
783
784         mutex_lock(&sdev->state_mutex);
785         ret = scsi_device_set_state(sdev, state);
786         mutex_unlock(&sdev->state_mutex);
787
788         return ret == 0 ? count : -EINVAL;
789 }
790
791 static ssize_t
792 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
793 {
794         struct scsi_device *sdev = to_scsi_device(dev);
795         const char *name = scsi_device_state_name(sdev->sdev_state);
796
797         if (!name)
798                 return -EINVAL;
799
800         return snprintf(buf, 20, "%s\n", name);
801 }
802
803 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
804
805 static ssize_t
806 show_queue_type_field(struct device *dev, struct device_attribute *attr,
807                       char *buf)
808 {
809         struct scsi_device *sdev = to_scsi_device(dev);
810         const char *name = "none";
811
812         if (sdev->simple_tags)
813                 name = "simple";
814
815         return snprintf(buf, 20, "%s\n", name);
816 }
817
818 static ssize_t
819 store_queue_type_field(struct device *dev, struct device_attribute *attr,
820                        const char *buf, size_t count)
821 {
822         struct scsi_device *sdev = to_scsi_device(dev);
823
824         if (!sdev->tagged_supported)
825                 return -EINVAL;
826                 
827         sdev_printk(KERN_INFO, sdev,
828                     "ignoring write to deprecated queue_type attribute");
829         return count;
830 }
831
832 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
833                    store_queue_type_field);
834
835 #define sdev_vpd_pg_attr(_page)                                         \
836 static ssize_t                                                  \
837 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
838                  struct bin_attribute *bin_attr,                        \
839                  char *buf, loff_t off, size_t count)                   \
840 {                                                                       \
841         struct device *dev = container_of(kobj, struct device, kobj);   \
842         struct scsi_device *sdev = to_scsi_device(dev);                 \
843         struct scsi_vpd *vpd_page;                                      \
844         int ret = -EINVAL;                                              \
845                                                                         \
846         rcu_read_lock();                                                \
847         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
848         if (vpd_page)                                                   \
849                 ret = memory_read_from_buffer(buf, count, &off,         \
850                                 vpd_page->data, vpd_page->len);         \
851         rcu_read_unlock();                                              \
852         return ret;                                                     \
853 }                                                                       \
854 static struct bin_attribute dev_attr_vpd_##_page = {            \
855         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
856         .size = 0,                                                      \
857         .read = show_vpd_##_page,                                       \
858 };
859
860 sdev_vpd_pg_attr(pg83);
861 sdev_vpd_pg_attr(pg80);
862
863 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
864                             struct bin_attribute *bin_attr,
865                             char *buf, loff_t off, size_t count)
866 {
867         struct device *dev = container_of(kobj, struct device, kobj);
868         struct scsi_device *sdev = to_scsi_device(dev);
869
870         if (!sdev->inquiry)
871                 return -EINVAL;
872
873         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
874                                        sdev->inquiry_len);
875 }
876
877 static struct bin_attribute dev_attr_inquiry = {
878         .attr = {
879                 .name = "inquiry",
880                 .mode = S_IRUGO,
881         },
882         .size = 0,
883         .read = show_inquiry,
884 };
885
886 static ssize_t
887 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
888                         char *buf)
889 {
890         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
891 }
892
893 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
894
895 #define show_sdev_iostat(field)                                         \
896 static ssize_t                                                          \
897 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
898                     char *buf)                                          \
899 {                                                                       \
900         struct scsi_device *sdev = to_scsi_device(dev);                 \
901         unsigned long long count = atomic_read(&sdev->field);           \
902         return snprintf(buf, 20, "0x%llx\n", count);                    \
903 }                                                                       \
904 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
905
906 show_sdev_iostat(iorequest_cnt);
907 show_sdev_iostat(iodone_cnt);
908 show_sdev_iostat(ioerr_cnt);
909
910 static ssize_t
911 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
912 {
913         struct scsi_device *sdev;
914         sdev = to_scsi_device(dev);
915         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
916 }
917 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
918
919 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
920 static ssize_t                                                          \
921 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
922                      char *buf)                                         \
923 {                                                                       \
924         struct scsi_device *sdev = to_scsi_device(dev);                 \
925         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
926         return snprintf(buf, 20, "%d\n", val);                          \
927 }
928
929 #define DECLARE_EVT_STORE(name, Cap_name)                               \
930 static ssize_t                                                          \
931 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
932                       const char *buf, size_t count)                    \
933 {                                                                       \
934         struct scsi_device *sdev = to_scsi_device(dev);                 \
935         int val = simple_strtoul(buf, NULL, 0);                         \
936         if (val == 0)                                                   \
937                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
938         else if (val == 1)                                              \
939                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
940         else                                                            \
941                 return -EINVAL;                                         \
942         return count;                                                   \
943 }
944
945 #define DECLARE_EVT(name, Cap_name)                                     \
946         DECLARE_EVT_SHOW(name, Cap_name)                                \
947         DECLARE_EVT_STORE(name, Cap_name)                               \
948         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
949                            sdev_store_evt_##name);
950 #define REF_EVT(name) &dev_attr_evt_##name.attr
951
952 DECLARE_EVT(media_change, MEDIA_CHANGE)
953 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
954 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
955 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
956 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
957 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
958
959 static ssize_t
960 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
961                        const char *buf, size_t count)
962 {
963         int depth, retval;
964         struct scsi_device *sdev = to_scsi_device(dev);
965         struct scsi_host_template *sht = sdev->host->hostt;
966
967         if (!sht->change_queue_depth)
968                 return -EINVAL;
969
970         depth = simple_strtoul(buf, NULL, 0);
971
972         if (depth < 1 || depth > sdev->host->can_queue)
973                 return -EINVAL;
974
975         retval = sht->change_queue_depth(sdev, depth);
976         if (retval < 0)
977                 return retval;
978
979         sdev->max_queue_depth = sdev->queue_depth;
980
981         return count;
982 }
983 sdev_show_function(queue_depth, "%d\n");
984
985 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
986                    sdev_store_queue_depth);
987
988 static ssize_t
989 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
990                     char *buf)
991 {
992         struct scsi_device *sdev = to_scsi_device(dev);
993         ssize_t count;
994
995         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
996         if (count > 0) {
997                 buf[count] = '\n';
998                 count++;
999         }
1000         return count;
1001 }
1002 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1003
1004 #define BLIST_FLAG_NAME(name)                                   \
1005         [const_ilog2((__force __u64)BLIST_##name)] = #name
1006 static const char *const sdev_bflags_name[] = {
1007 #include "scsi_devinfo_tbl.c"
1008 };
1009 #undef BLIST_FLAG_NAME
1010
1011 static ssize_t
1012 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1013                     char *buf)
1014 {
1015         struct scsi_device *sdev = to_scsi_device(dev);
1016         int i;
1017         ssize_t len = 0;
1018
1019         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1020                 const char *name = NULL;
1021
1022                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1023                         continue;
1024                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1025                         name = sdev_bflags_name[i];
1026
1027                 if (name)
1028                         len += snprintf(buf + len, PAGE_SIZE - len,
1029                                         "%s%s", len ? " " : "", name);
1030                 else
1031                         len += snprintf(buf + len, PAGE_SIZE - len,
1032                                         "%sINVALID_BIT(%d)", len ? " " : "", i);
1033         }
1034         if (len)
1035                 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
1036         return len;
1037 }
1038 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1039
1040 #ifdef CONFIG_SCSI_DH
1041 static ssize_t
1042 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1043                    char *buf)
1044 {
1045         struct scsi_device *sdev = to_scsi_device(dev);
1046
1047         if (!sdev->handler)
1048                 return snprintf(buf, 20, "detached\n");
1049
1050         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1051 }
1052
1053 static ssize_t
1054 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1055                     const char *buf, size_t count)
1056 {
1057         struct scsi_device *sdev = to_scsi_device(dev);
1058         int err = -EINVAL;
1059
1060         if (sdev->sdev_state == SDEV_CANCEL ||
1061             sdev->sdev_state == SDEV_DEL)
1062                 return -ENODEV;
1063
1064         if (!sdev->handler) {
1065                 /*
1066                  * Attach to a device handler
1067                  */
1068                 err = scsi_dh_attach(sdev->request_queue, buf);
1069         } else if (!strncmp(buf, "activate", 8)) {
1070                 /*
1071                  * Activate a device handler
1072                  */
1073                 if (sdev->handler->activate)
1074                         err = sdev->handler->activate(sdev, NULL, NULL);
1075                 else
1076                         err = 0;
1077         } else if (!strncmp(buf, "detach", 6)) {
1078                 /*
1079                  * Detach from a device handler
1080                  */
1081                 sdev_printk(KERN_WARNING, sdev,
1082                             "can't detach handler %s.\n",
1083                             sdev->handler->name);
1084                 err = -EINVAL;
1085         }
1086
1087         return err < 0 ? err : count;
1088 }
1089
1090 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1091                    sdev_store_dh_state);
1092
1093 static ssize_t
1094 sdev_show_access_state(struct device *dev,
1095                        struct device_attribute *attr,
1096                        char *buf)
1097 {
1098         struct scsi_device *sdev = to_scsi_device(dev);
1099         unsigned char access_state;
1100         const char *access_state_name;
1101
1102         if (!sdev->handler)
1103                 return -EINVAL;
1104
1105         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1106         access_state_name = scsi_access_state_name(access_state);
1107
1108         return sprintf(buf, "%s\n",
1109                        access_state_name ? access_state_name : "unknown");
1110 }
1111 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1112
1113 static ssize_t
1114 sdev_show_preferred_path(struct device *dev,
1115                          struct device_attribute *attr,
1116                          char *buf)
1117 {
1118         struct scsi_device *sdev = to_scsi_device(dev);
1119
1120         if (!sdev->handler)
1121                 return -EINVAL;
1122
1123         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1124                 return sprintf(buf, "1\n");
1125         else
1126                 return sprintf(buf, "0\n");
1127 }
1128 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1129 #endif
1130
1131 static ssize_t
1132 sdev_show_queue_ramp_up_period(struct device *dev,
1133                                struct device_attribute *attr,
1134                                char *buf)
1135 {
1136         struct scsi_device *sdev;
1137         sdev = to_scsi_device(dev);
1138         return snprintf(buf, 20, "%u\n",
1139                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1140 }
1141
1142 static ssize_t
1143 sdev_store_queue_ramp_up_period(struct device *dev,
1144                                 struct device_attribute *attr,
1145                                 const char *buf, size_t count)
1146 {
1147         struct scsi_device *sdev = to_scsi_device(dev);
1148         unsigned int period;
1149
1150         if (kstrtouint(buf, 10, &period))
1151                 return -EINVAL;
1152
1153         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1154         return count;
1155 }
1156
1157 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1158                    sdev_show_queue_ramp_up_period,
1159                    sdev_store_queue_ramp_up_period);
1160
1161 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1162                                          struct attribute *attr, int i)
1163 {
1164         struct device *dev = container_of(kobj, struct device, kobj);
1165         struct scsi_device *sdev = to_scsi_device(dev);
1166
1167
1168         if (attr == &dev_attr_queue_depth.attr &&
1169             !sdev->host->hostt->change_queue_depth)
1170                 return S_IRUGO;
1171
1172         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1173             !sdev->host->hostt->change_queue_depth)
1174                 return 0;
1175
1176 #ifdef CONFIG_SCSI_DH
1177         if (attr == &dev_attr_access_state.attr &&
1178             !sdev->handler)
1179                 return 0;
1180         if (attr == &dev_attr_preferred_path.attr &&
1181             !sdev->handler)
1182                 return 0;
1183 #endif
1184         return attr->mode;
1185 }
1186
1187 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1188                                              struct bin_attribute *attr, int i)
1189 {
1190         struct device *dev = container_of(kobj, struct device, kobj);
1191         struct scsi_device *sdev = to_scsi_device(dev);
1192
1193
1194         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1195                 return 0;
1196
1197         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1198                 return 0;
1199
1200         return S_IRUGO;
1201 }
1202
1203 /* Default template for device attributes.  May NOT be modified */
1204 static struct attribute *scsi_sdev_attrs[] = {
1205         &dev_attr_device_blocked.attr,
1206         &dev_attr_type.attr,
1207         &dev_attr_scsi_level.attr,
1208         &dev_attr_device_busy.attr,
1209         &dev_attr_vendor.attr,
1210         &dev_attr_model.attr,
1211         &dev_attr_rev.attr,
1212         &dev_attr_rescan.attr,
1213         &dev_attr_delete.attr,
1214         &dev_attr_state.attr,
1215         &dev_attr_timeout.attr,
1216         &dev_attr_eh_timeout.attr,
1217         &dev_attr_iocounterbits.attr,
1218         &dev_attr_iorequest_cnt.attr,
1219         &dev_attr_iodone_cnt.attr,
1220         &dev_attr_ioerr_cnt.attr,
1221         &dev_attr_modalias.attr,
1222         &dev_attr_queue_depth.attr,
1223         &dev_attr_queue_type.attr,
1224         &dev_attr_wwid.attr,
1225         &dev_attr_blacklist.attr,
1226 #ifdef CONFIG_SCSI_DH
1227         &dev_attr_dh_state.attr,
1228         &dev_attr_access_state.attr,
1229         &dev_attr_preferred_path.attr,
1230 #endif
1231         &dev_attr_queue_ramp_up_period.attr,
1232         REF_EVT(media_change),
1233         REF_EVT(inquiry_change_reported),
1234         REF_EVT(capacity_change_reported),
1235         REF_EVT(soft_threshold_reached),
1236         REF_EVT(mode_parameter_change_reported),
1237         REF_EVT(lun_change_reported),
1238         NULL
1239 };
1240
1241 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1242         &dev_attr_vpd_pg83,
1243         &dev_attr_vpd_pg80,
1244         &dev_attr_inquiry,
1245         NULL
1246 };
1247 static struct attribute_group scsi_sdev_attr_group = {
1248         .attrs =        scsi_sdev_attrs,
1249         .bin_attrs =    scsi_sdev_bin_attrs,
1250         .is_visible =   scsi_sdev_attr_is_visible,
1251         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1252 };
1253
1254 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1255         &scsi_sdev_attr_group,
1256         NULL
1257 };
1258
1259 static int scsi_target_add(struct scsi_target *starget)
1260 {
1261         int error;
1262
1263         if (starget->state != STARGET_CREATED)
1264                 return 0;
1265
1266         error = device_add(&starget->dev);
1267         if (error) {
1268                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1269                 return error;
1270         }
1271         transport_add_device(&starget->dev);
1272         starget->state = STARGET_RUNNING;
1273
1274         pm_runtime_set_active(&starget->dev);
1275         pm_runtime_enable(&starget->dev);
1276         device_enable_async_suspend(&starget->dev);
1277
1278         return 0;
1279 }
1280
1281 /**
1282  * scsi_sysfs_add_sdev - add scsi device to sysfs
1283  * @sdev:       scsi_device to add
1284  *
1285  * Return value:
1286  *      0 on Success / non-zero on Failure
1287  **/
1288 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1289 {
1290         int error, i;
1291         struct request_queue *rq = sdev->request_queue;
1292         struct scsi_target *starget = sdev->sdev_target;
1293
1294         error = scsi_target_add(starget);
1295         if (error)
1296                 return error;
1297
1298         transport_configure_device(&starget->dev);
1299
1300         device_enable_async_suspend(&sdev->sdev_gendev);
1301         scsi_autopm_get_target(starget);
1302         pm_runtime_set_active(&sdev->sdev_gendev);
1303         pm_runtime_forbid(&sdev->sdev_gendev);
1304         pm_runtime_enable(&sdev->sdev_gendev);
1305         scsi_autopm_put_target(starget);
1306
1307         scsi_autopm_get_device(sdev);
1308
1309         scsi_dh_add_device(sdev);
1310
1311         error = device_add(&sdev->sdev_gendev);
1312         if (error) {
1313                 sdev_printk(KERN_INFO, sdev,
1314                                 "failed to add device: %d\n", error);
1315                 return error;
1316         }
1317
1318         device_enable_async_suspend(&sdev->sdev_dev);
1319         error = device_add(&sdev->sdev_dev);
1320         if (error) {
1321                 sdev_printk(KERN_INFO, sdev,
1322                                 "failed to add class device: %d\n", error);
1323                 device_del(&sdev->sdev_gendev);
1324                 return error;
1325         }
1326         transport_add_device(&sdev->sdev_gendev);
1327         sdev->is_visible = 1;
1328
1329         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1330         if (error)
1331                 /* we're treating error on bsg register as non-fatal,
1332                  * so pretend nothing went wrong */
1333                 sdev_printk(KERN_INFO, sdev,
1334                             "Failed to register bsg queue, errno=%d\n", error);
1335
1336         /* add additional host specific attributes */
1337         if (sdev->host->hostt->sdev_attrs) {
1338                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1339                         error = device_create_file(&sdev->sdev_gendev,
1340                                         sdev->host->hostt->sdev_attrs[i]);
1341                         if (error)
1342                                 return error;
1343                 }
1344         }
1345
1346         if (sdev->host->hostt->sdev_groups) {
1347                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1348                                 sdev->host->hostt->sdev_groups);
1349                 if (error)
1350                         return error;
1351         }
1352
1353         scsi_autopm_put_device(sdev);
1354         return error;
1355 }
1356
1357 void __scsi_remove_device(struct scsi_device *sdev)
1358 {
1359         struct device *dev = &sdev->sdev_gendev;
1360         int res;
1361
1362         /*
1363          * This cleanup path is not reentrant and while it is impossible
1364          * to get a new reference with scsi_device_get() someone can still
1365          * hold a previously acquired one.
1366          */
1367         if (sdev->sdev_state == SDEV_DEL)
1368                 return;
1369
1370         if (sdev->is_visible) {
1371                 /*
1372                  * If scsi_internal_target_block() is running concurrently,
1373                  * wait until it has finished before changing the device state.
1374                  */
1375                 mutex_lock(&sdev->state_mutex);
1376                 /*
1377                  * If blocked, we go straight to DEL and restart the queue so
1378                  * any commands issued during driver shutdown (like sync
1379                  * cache) are errored immediately.
1380                  */
1381                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1382                 if (res != 0) {
1383                         res = scsi_device_set_state(sdev, SDEV_DEL);
1384                         if (res == 0)
1385                                 scsi_start_queue(sdev);
1386                 }
1387                 mutex_unlock(&sdev->state_mutex);
1388
1389                 if (res != 0)
1390                         return;
1391
1392                 if (sdev->host->hostt->sdev_groups)
1393                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1394                                         sdev->host->hostt->sdev_groups);
1395
1396                 bsg_unregister_queue(sdev->request_queue);
1397                 device_unregister(&sdev->sdev_dev);
1398                 transport_remove_device(dev);
1399                 device_del(dev);
1400         } else
1401                 put_device(&sdev->sdev_dev);
1402
1403         /*
1404          * Stop accepting new requests and wait until all queuecommand() and
1405          * scsi_run_queue() invocations have finished before tearing down the
1406          * device.
1407          */
1408         mutex_lock(&sdev->state_mutex);
1409         scsi_device_set_state(sdev, SDEV_DEL);
1410         mutex_unlock(&sdev->state_mutex);
1411
1412         blk_cleanup_queue(sdev->request_queue);
1413         cancel_work_sync(&sdev->requeue_work);
1414
1415         if (sdev->host->hostt->slave_destroy)
1416                 sdev->host->hostt->slave_destroy(sdev);
1417         transport_destroy_device(dev);
1418
1419         /*
1420          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1421          * remoed sysfs visibility from the device, so make the target
1422          * invisible if this was the last device underneath it.
1423          */
1424         scsi_target_reap(scsi_target(sdev));
1425
1426         put_device(dev);
1427 }
1428
1429 /**
1430  * scsi_remove_device - unregister a device from the scsi bus
1431  * @sdev:       scsi_device to unregister
1432  **/
1433 void scsi_remove_device(struct scsi_device *sdev)
1434 {
1435         struct Scsi_Host *shost = sdev->host;
1436
1437         mutex_lock(&shost->scan_mutex);
1438         __scsi_remove_device(sdev);
1439         mutex_unlock(&shost->scan_mutex);
1440 }
1441 EXPORT_SYMBOL(scsi_remove_device);
1442
1443 static void __scsi_remove_target(struct scsi_target *starget)
1444 {
1445         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1446         unsigned long flags;
1447         struct scsi_device *sdev;
1448
1449         spin_lock_irqsave(shost->host_lock, flags);
1450  restart:
1451         list_for_each_entry(sdev, &shost->__devices, siblings) {
1452                 /*
1453                  * We cannot call scsi_device_get() here, as
1454                  * we might've been called from rmmod() causing
1455                  * scsi_device_get() to fail the module_is_live()
1456                  * check.
1457                  */
1458                 if (sdev->channel != starget->channel ||
1459                     sdev->id != starget->id)
1460                         continue;
1461                 if (sdev->sdev_state == SDEV_DEL ||
1462                     sdev->sdev_state == SDEV_CANCEL ||
1463                     !get_device(&sdev->sdev_gendev))
1464                         continue;
1465                 spin_unlock_irqrestore(shost->host_lock, flags);
1466                 scsi_remove_device(sdev);
1467                 put_device(&sdev->sdev_gendev);
1468                 spin_lock_irqsave(shost->host_lock, flags);
1469                 goto restart;
1470         }
1471         spin_unlock_irqrestore(shost->host_lock, flags);
1472 }
1473
1474 /**
1475  * scsi_remove_target - try to remove a target and all its devices
1476  * @dev: generic starget or parent of generic stargets to be removed
1477  *
1478  * Note: This is slightly racy.  It is possible that if the user
1479  * requests the addition of another device then the target won't be
1480  * removed.
1481  */
1482 void scsi_remove_target(struct device *dev)
1483 {
1484         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1485         struct scsi_target *starget;
1486         unsigned long flags;
1487
1488 restart:
1489         spin_lock_irqsave(shost->host_lock, flags);
1490         list_for_each_entry(starget, &shost->__targets, siblings) {
1491                 if (starget->state == STARGET_DEL ||
1492                     starget->state == STARGET_REMOVE ||
1493                     starget->state == STARGET_CREATED_REMOVE)
1494                         continue;
1495                 if (starget->dev.parent == dev || &starget->dev == dev) {
1496                         kref_get(&starget->reap_ref);
1497                         if (starget->state == STARGET_CREATED)
1498                                 starget->state = STARGET_CREATED_REMOVE;
1499                         else
1500                                 starget->state = STARGET_REMOVE;
1501                         spin_unlock_irqrestore(shost->host_lock, flags);
1502                         __scsi_remove_target(starget);
1503                         scsi_target_reap(starget);
1504                         goto restart;
1505                 }
1506         }
1507         spin_unlock_irqrestore(shost->host_lock, flags);
1508 }
1509 EXPORT_SYMBOL(scsi_remove_target);
1510
1511 int scsi_register_driver(struct device_driver *drv)
1512 {
1513         drv->bus = &scsi_bus_type;
1514
1515         return driver_register(drv);
1516 }
1517 EXPORT_SYMBOL(scsi_register_driver);
1518
1519 int scsi_register_interface(struct class_interface *intf)
1520 {
1521         intf->class = &sdev_class;
1522
1523         return class_interface_register(intf);
1524 }
1525 EXPORT_SYMBOL(scsi_register_interface);
1526
1527 /**
1528  * scsi_sysfs_add_host - add scsi host to subsystem
1529  * @shost:     scsi host struct to add to subsystem
1530  **/
1531 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1532 {
1533         int error, i;
1534
1535         /* add host specific attributes */
1536         if (shost->hostt->shost_attrs) {
1537                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1538                         error = device_create_file(&shost->shost_dev,
1539                                         shost->hostt->shost_attrs[i]);
1540                         if (error)
1541                                 return error;
1542                 }
1543         }
1544
1545         transport_register_device(&shost->shost_gendev);
1546         transport_configure_device(&shost->shost_gendev);
1547         return 0;
1548 }
1549
1550 static struct device_type scsi_dev_type = {
1551         .name =         "scsi_device",
1552         .release =      scsi_device_dev_release,
1553         .groups =       scsi_sdev_attr_groups,
1554 };
1555
1556 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1557 {
1558         unsigned long flags;
1559         struct Scsi_Host *shost = sdev->host;
1560         struct scsi_target  *starget = sdev->sdev_target;
1561
1562         device_initialize(&sdev->sdev_gendev);
1563         sdev->sdev_gendev.bus = &scsi_bus_type;
1564         sdev->sdev_gendev.type = &scsi_dev_type;
1565         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1566                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1567
1568         device_initialize(&sdev->sdev_dev);
1569         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1570         sdev->sdev_dev.class = &sdev_class;
1571         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1572                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1573         /*
1574          * Get a default scsi_level from the target (derived from sibling
1575          * devices).  This is the best we can do for guessing how to set
1576          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1577          * setting doesn't matter, because all the bits are zero anyway.
1578          * But it does matter for higher LUNs.
1579          */
1580         sdev->scsi_level = starget->scsi_level;
1581         if (sdev->scsi_level <= SCSI_2 &&
1582                         sdev->scsi_level != SCSI_UNKNOWN &&
1583                         !shost->no_scsi2_lun_in_cdb)
1584                 sdev->lun_in_cdb = 1;
1585
1586         transport_setup_device(&sdev->sdev_gendev);
1587         spin_lock_irqsave(shost->host_lock, flags);
1588         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1589         list_add_tail(&sdev->siblings, &shost->__devices);
1590         spin_unlock_irqrestore(shost->host_lock, flags);
1591         /*
1592          * device can now only be removed via __scsi_remove_device() so hold
1593          * the target.  Target will be held in CREATED state until something
1594          * beneath it becomes visible (in which case it moves to RUNNING)
1595          */
1596         kref_get(&starget->reap_ref);
1597 }
1598
1599 int scsi_is_sdev_device(const struct device *dev)
1600 {
1601         return dev->type == &scsi_dev_type;
1602 }
1603 EXPORT_SYMBOL(scsi_is_sdev_device);
1604
1605 /* A blank transport template that is used in drivers that don't
1606  * yet implement Transport Attributes */
1607 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };