GNU Linux-libre 5.4.241-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 struct attribute *scsi_sysfs_shost_attrs[] = {
397         &dev_attr_use_blk_mq.attr,
398         &dev_attr_unique_id.attr,
399         &dev_attr_host_busy.attr,
400         &dev_attr_cmd_per_lun.attr,
401         &dev_attr_can_queue.attr,
402         &dev_attr_sg_tablesize.attr,
403         &dev_attr_sg_prot_tablesize.attr,
404         &dev_attr_unchecked_isa_dma.attr,
405         &dev_attr_proc_name.attr,
406         &dev_attr_scan.attr,
407         &dev_attr_hstate.attr,
408         &dev_attr_supported_mode.attr,
409         &dev_attr_active_mode.attr,
410         &dev_attr_prot_capabilities.attr,
411         &dev_attr_prot_guard_type.attr,
412         &dev_attr_host_reset.attr,
413         &dev_attr_eh_deadline.attr,
414         NULL
415 };
416
417 static struct attribute_group scsi_shost_attr_group = {
418         .attrs =        scsi_sysfs_shost_attrs,
419 };
420
421 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
422         &scsi_shost_attr_group,
423         NULL
424 };
425
426 static void scsi_device_cls_release(struct device *class_dev)
427 {
428         struct scsi_device *sdev;
429
430         sdev = class_to_sdev(class_dev);
431         put_device(&sdev->sdev_gendev);
432 }
433
434 static void scsi_device_dev_release_usercontext(struct work_struct *work)
435 {
436         struct scsi_device *sdev;
437         struct device *parent;
438         struct list_head *this, *tmp;
439         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
440         unsigned long flags;
441         struct module *mod;
442
443         sdev = container_of(work, struct scsi_device, ew.work);
444
445         mod = sdev->host->hostt->module;
446
447         scsi_dh_release_device(sdev);
448
449         parent = sdev->sdev_gendev.parent;
450
451         spin_lock_irqsave(sdev->host->host_lock, flags);
452         list_del(&sdev->siblings);
453         list_del(&sdev->same_target_siblings);
454         list_del(&sdev->starved_entry);
455         spin_unlock_irqrestore(sdev->host->host_lock, flags);
456
457         cancel_work_sync(&sdev->event_work);
458
459         list_for_each_safe(this, tmp, &sdev->event_list) {
460                 struct scsi_event *evt;
461
462                 evt = list_entry(this, struct scsi_event, node);
463                 list_del(&evt->node);
464                 kfree(evt);
465         }
466
467         blk_put_queue(sdev->request_queue);
468         /* NULL queue means the device can't be used */
469         sdev->request_queue = NULL;
470
471         mutex_lock(&sdev->inquiry_mutex);
472         rcu_swap_protected(sdev->vpd_pg80, vpd_pg80,
473                            lockdep_is_held(&sdev->inquiry_mutex));
474         rcu_swap_protected(sdev->vpd_pg83, vpd_pg83,
475                            lockdep_is_held(&sdev->inquiry_mutex));
476         mutex_unlock(&sdev->inquiry_mutex);
477
478         if (vpd_pg83)
479                 kfree_rcu(vpd_pg83, rcu);
480         if (vpd_pg80)
481                 kfree_rcu(vpd_pg80, rcu);
482         kfree(sdev->inquiry);
483         kfree(sdev);
484
485         if (parent)
486                 put_device(parent);
487         module_put(mod);
488 }
489
490 static void scsi_device_dev_release(struct device *dev)
491 {
492         struct scsi_device *sdp = to_scsi_device(dev);
493
494         /* Set module pointer as NULL in case of module unloading */
495         if (!try_module_get(sdp->host->hostt->module))
496                 sdp->host->hostt->module = NULL;
497
498         execute_in_process_context(scsi_device_dev_release_usercontext,
499                                    &sdp->ew);
500 }
501
502 static struct class sdev_class = {
503         .name           = "scsi_device",
504         .dev_release    = scsi_device_cls_release,
505 };
506
507 /* all probing is done in the individual ->probe routines */
508 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
509 {
510         struct scsi_device *sdp;
511
512         if (dev->type != &scsi_dev_type)
513                 return 0;
514
515         sdp = to_scsi_device(dev);
516         if (sdp->no_uld_attach)
517                 return 0;
518         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
519 }
520
521 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
522 {
523         struct scsi_device *sdev;
524
525         if (dev->type != &scsi_dev_type)
526                 return 0;
527
528         sdev = to_scsi_device(dev);
529
530         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
531         return 0;
532 }
533
534 struct bus_type scsi_bus_type = {
535         .name           = "scsi",
536         .match          = scsi_bus_match,
537         .uevent         = scsi_bus_uevent,
538 #ifdef CONFIG_PM
539         .pm             = &scsi_bus_pm_ops,
540 #endif
541 };
542 EXPORT_SYMBOL_GPL(scsi_bus_type);
543
544 int scsi_sysfs_register(void)
545 {
546         int error;
547
548         error = bus_register(&scsi_bus_type);
549         if (!error) {
550                 error = class_register(&sdev_class);
551                 if (error)
552                         bus_unregister(&scsi_bus_type);
553         }
554
555         return error;
556 }
557
558 void scsi_sysfs_unregister(void)
559 {
560         class_unregister(&sdev_class);
561         bus_unregister(&scsi_bus_type);
562 }
563
564 /*
565  * sdev_show_function: macro to create an attr function that can be used to
566  * show a non-bit field.
567  */
568 #define sdev_show_function(field, format_string)                                \
569 static ssize_t                                                          \
570 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
571                    char *buf)                                           \
572 {                                                                       \
573         struct scsi_device *sdev;                                       \
574         sdev = to_scsi_device(dev);                                     \
575         return snprintf (buf, 20, format_string, sdev->field);          \
576 }                                                                       \
577
578 /*
579  * sdev_rd_attr: macro to create a function and attribute variable for a
580  * read only field.
581  */
582 #define sdev_rd_attr(field, format_string)                              \
583         sdev_show_function(field, format_string)                        \
584 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
585
586
587 /*
588  * sdev_rw_attr: create a function and attribute variable for a
589  * read/write field.
590  */
591 #define sdev_rw_attr(field, format_string)                              \
592         sdev_show_function(field, format_string)                                \
593                                                                         \
594 static ssize_t                                                          \
595 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
596                     const char *buf, size_t count)                      \
597 {                                                                       \
598         struct scsi_device *sdev;                                       \
599         sdev = to_scsi_device(dev);                                     \
600         sscanf (buf, format_string, &sdev->field);                      \
601         return count;                                                   \
602 }                                                                       \
603 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
604
605 /* Currently we don't export bit fields, but we might in future,
606  * so leave this code in */
607 #if 0
608 /*
609  * sdev_rd_attr: create a function and attribute variable for a
610  * read/write bit field.
611  */
612 #define sdev_rw_attr_bit(field)                                         \
613         sdev_show_function(field, "%d\n")                                       \
614                                                                         \
615 static ssize_t                                                          \
616 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
617                     const char *buf, size_t count)                      \
618 {                                                                       \
619         int ret;                                                        \
620         struct scsi_device *sdev;                                       \
621         ret = scsi_sdev_check_buf_bit(buf);                             \
622         if (ret >= 0)   {                                               \
623                 sdev = to_scsi_device(dev);                             \
624                 sdev->field = ret;                                      \
625                 ret = count;                                            \
626         }                                                               \
627         return ret;                                                     \
628 }                                                                       \
629 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
630
631 /*
632  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
633  * else return -EINVAL.
634  */
635 static int scsi_sdev_check_buf_bit(const char *buf)
636 {
637         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
638                 if (buf[0] == '1')
639                         return 1;
640                 else if (buf[0] == '0')
641                         return 0;
642                 else 
643                         return -EINVAL;
644         } else
645                 return -EINVAL;
646 }
647 #endif
648 /*
649  * Create the actual show/store functions and data structures.
650  */
651 sdev_rd_attr (type, "%d\n");
652 sdev_rd_attr (scsi_level, "%d\n");
653 sdev_rd_attr (vendor, "%.8s\n");
654 sdev_rd_attr (model, "%.16s\n");
655 sdev_rd_attr (rev, "%.4s\n");
656
657 static ssize_t
658 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
659                 char *buf)
660 {
661         struct scsi_device *sdev = to_scsi_device(dev);
662         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
663 }
664 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
665
666 static ssize_t
667 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
668                 char *buf)
669 {
670         struct scsi_device *sdev = to_scsi_device(dev);
671         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
672 }
673 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
674
675 /*
676  * TODO: can we make these symlinks to the block layer ones?
677  */
678 static ssize_t
679 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
680 {
681         struct scsi_device *sdev;
682         sdev = to_scsi_device(dev);
683         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
684 }
685
686 static ssize_t
687 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
688                     const char *buf, size_t count)
689 {
690         struct scsi_device *sdev;
691         int timeout;
692         sdev = to_scsi_device(dev);
693         sscanf (buf, "%d\n", &timeout);
694         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
695         return count;
696 }
697 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
698
699 static ssize_t
700 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
701 {
702         struct scsi_device *sdev;
703         sdev = to_scsi_device(dev);
704         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
705 }
706
707 static ssize_t
708 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
709                     const char *buf, size_t count)
710 {
711         struct scsi_device *sdev;
712         unsigned int eh_timeout;
713         int err;
714
715         if (!capable(CAP_SYS_ADMIN))
716                 return -EACCES;
717
718         sdev = to_scsi_device(dev);
719         err = kstrtouint(buf, 10, &eh_timeout);
720         if (err)
721                 return err;
722         sdev->eh_timeout = eh_timeout * HZ;
723
724         return count;
725 }
726 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
727
728 static ssize_t
729 store_rescan_field (struct device *dev, struct device_attribute *attr,
730                     const char *buf, size_t count)
731 {
732         scsi_rescan_device(dev);
733         return count;
734 }
735 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
736
737 static ssize_t
738 sdev_store_delete(struct device *dev, struct device_attribute *attr,
739                   const char *buf, size_t count)
740 {
741         struct kernfs_node *kn;
742         struct scsi_device *sdev = to_scsi_device(dev);
743
744         /*
745          * We need to try to get module, avoiding the module been removed
746          * during delete.
747          */
748         if (scsi_device_get(sdev))
749                 return -ENODEV;
750
751         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
752         WARN_ON_ONCE(!kn);
753         /*
754          * Concurrent writes into the "delete" sysfs attribute may trigger
755          * concurrent calls to device_remove_file() and scsi_remove_device().
756          * device_remove_file() handles concurrent removal calls by
757          * serializing these and by ignoring the second and later removal
758          * attempts.  Concurrent calls of scsi_remove_device() are
759          * serialized. The second and later calls of scsi_remove_device() are
760          * ignored because the first call of that function changes the device
761          * state into SDEV_DEL.
762          */
763         device_remove_file(dev, attr);
764         scsi_remove_device(sdev);
765         if (kn)
766                 sysfs_unbreak_active_protection(kn);
767         scsi_device_put(sdev);
768         return count;
769 };
770 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
771
772 static ssize_t
773 store_state_field(struct device *dev, struct device_attribute *attr,
774                   const char *buf, size_t count)
775 {
776         int i, ret;
777         struct scsi_device *sdev = to_scsi_device(dev);
778         enum scsi_device_state state = 0;
779         bool rescan_dev = false;
780
781         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
782                 const int len = strlen(sdev_states[i].name);
783                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
784                    buf[len] == '\n') {
785                         state = sdev_states[i].value;
786                         break;
787                 }
788         }
789         switch (state) {
790         case SDEV_RUNNING:
791         case SDEV_OFFLINE:
792                 break;
793         default:
794                 return -EINVAL;
795         }
796
797         mutex_lock(&sdev->state_mutex);
798         switch (sdev->sdev_state) {
799         case SDEV_RUNNING:
800         case SDEV_OFFLINE:
801                 break;
802         default:
803                 mutex_unlock(&sdev->state_mutex);
804                 return -EINVAL;
805         }
806         if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
807                 ret = 0;
808         } else {
809                 ret = scsi_device_set_state(sdev, state);
810                 if (ret == 0 && state == SDEV_RUNNING)
811                         rescan_dev = true;
812         }
813         mutex_unlock(&sdev->state_mutex);
814
815         if (rescan_dev) {
816                 /*
817                  * If the device state changes to SDEV_RUNNING, we need to
818                  * run the queue to avoid I/O hang, and rescan the device
819                  * to revalidate it. Running the queue first is necessary
820                  * because another thread may be waiting inside
821                  * blk_mq_freeze_queue_wait() and because that call may be
822                  * waiting for pending I/O to finish.
823                  */
824                 blk_mq_run_hw_queues(sdev->request_queue, true);
825                 scsi_rescan_device(dev);
826         }
827
828         return ret == 0 ? count : -EINVAL;
829 }
830
831 static ssize_t
832 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
833 {
834         struct scsi_device *sdev = to_scsi_device(dev);
835         const char *name = scsi_device_state_name(sdev->sdev_state);
836
837         if (!name)
838                 return -EINVAL;
839
840         return snprintf(buf, 20, "%s\n", name);
841 }
842
843 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
844
845 static ssize_t
846 show_queue_type_field(struct device *dev, struct device_attribute *attr,
847                       char *buf)
848 {
849         struct scsi_device *sdev = to_scsi_device(dev);
850         const char *name = "none";
851
852         if (sdev->simple_tags)
853                 name = "simple";
854
855         return snprintf(buf, 20, "%s\n", name);
856 }
857
858 static ssize_t
859 store_queue_type_field(struct device *dev, struct device_attribute *attr,
860                        const char *buf, size_t count)
861 {
862         struct scsi_device *sdev = to_scsi_device(dev);
863
864         if (!sdev->tagged_supported)
865                 return -EINVAL;
866                 
867         sdev_printk(KERN_INFO, sdev,
868                     "ignoring write to deprecated queue_type attribute");
869         return count;
870 }
871
872 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
873                    store_queue_type_field);
874
875 #define sdev_vpd_pg_attr(_page)                                         \
876 static ssize_t                                                  \
877 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
878                  struct bin_attribute *bin_attr,                        \
879                  char *buf, loff_t off, size_t count)                   \
880 {                                                                       \
881         struct device *dev = container_of(kobj, struct device, kobj);   \
882         struct scsi_device *sdev = to_scsi_device(dev);                 \
883         struct scsi_vpd *vpd_page;                                      \
884         int ret = -EINVAL;                                              \
885                                                                         \
886         rcu_read_lock();                                                \
887         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
888         if (vpd_page)                                                   \
889                 ret = memory_read_from_buffer(buf, count, &off,         \
890                                 vpd_page->data, vpd_page->len);         \
891         rcu_read_unlock();                                              \
892         return ret;                                                     \
893 }                                                                       \
894 static struct bin_attribute dev_attr_vpd_##_page = {            \
895         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
896         .size = 0,                                                      \
897         .read = show_vpd_##_page,                                       \
898 };
899
900 sdev_vpd_pg_attr(pg83);
901 sdev_vpd_pg_attr(pg80);
902
903 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
904                             struct bin_attribute *bin_attr,
905                             char *buf, loff_t off, size_t count)
906 {
907         struct device *dev = container_of(kobj, struct device, kobj);
908         struct scsi_device *sdev = to_scsi_device(dev);
909
910         if (!sdev->inquiry)
911                 return -EINVAL;
912
913         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
914                                        sdev->inquiry_len);
915 }
916
917 static struct bin_attribute dev_attr_inquiry = {
918         .attr = {
919                 .name = "inquiry",
920                 .mode = S_IRUGO,
921         },
922         .size = 0,
923         .read = show_inquiry,
924 };
925
926 static ssize_t
927 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
928                         char *buf)
929 {
930         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
931 }
932
933 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
934
935 #define show_sdev_iostat(field)                                         \
936 static ssize_t                                                          \
937 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
938                     char *buf)                                          \
939 {                                                                       \
940         struct scsi_device *sdev = to_scsi_device(dev);                 \
941         unsigned long long count = atomic_read(&sdev->field);           \
942         return snprintf(buf, 20, "0x%llx\n", count);                    \
943 }                                                                       \
944 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
945
946 show_sdev_iostat(iorequest_cnt);
947 show_sdev_iostat(iodone_cnt);
948 show_sdev_iostat(ioerr_cnt);
949
950 static ssize_t
951 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
952 {
953         struct scsi_device *sdev;
954         sdev = to_scsi_device(dev);
955         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
956 }
957 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
958
959 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
960 static ssize_t                                                          \
961 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
962                      char *buf)                                         \
963 {                                                                       \
964         struct scsi_device *sdev = to_scsi_device(dev);                 \
965         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
966         return snprintf(buf, 20, "%d\n", val);                          \
967 }
968
969 #define DECLARE_EVT_STORE(name, Cap_name)                               \
970 static ssize_t                                                          \
971 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
972                       const char *buf, size_t count)                    \
973 {                                                                       \
974         struct scsi_device *sdev = to_scsi_device(dev);                 \
975         int val = simple_strtoul(buf, NULL, 0);                         \
976         if (val == 0)                                                   \
977                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
978         else if (val == 1)                                              \
979                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
980         else                                                            \
981                 return -EINVAL;                                         \
982         return count;                                                   \
983 }
984
985 #define DECLARE_EVT(name, Cap_name)                                     \
986         DECLARE_EVT_SHOW(name, Cap_name)                                \
987         DECLARE_EVT_STORE(name, Cap_name)                               \
988         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
989                            sdev_store_evt_##name);
990 #define REF_EVT(name) &dev_attr_evt_##name.attr
991
992 DECLARE_EVT(media_change, MEDIA_CHANGE)
993 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
994 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
995 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
996 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
997 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
998
999 static ssize_t
1000 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1001                        const char *buf, size_t count)
1002 {
1003         int depth, retval;
1004         struct scsi_device *sdev = to_scsi_device(dev);
1005         struct scsi_host_template *sht = sdev->host->hostt;
1006
1007         if (!sht->change_queue_depth)
1008                 return -EINVAL;
1009
1010         depth = simple_strtoul(buf, NULL, 0);
1011
1012         if (depth < 1 || depth > sdev->host->can_queue)
1013                 return -EINVAL;
1014
1015         retval = sht->change_queue_depth(sdev, depth);
1016         if (retval < 0)
1017                 return retval;
1018
1019         sdev->max_queue_depth = sdev->queue_depth;
1020
1021         return count;
1022 }
1023 sdev_show_function(queue_depth, "%d\n");
1024
1025 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1026                    sdev_store_queue_depth);
1027
1028 static ssize_t
1029 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1030                     char *buf)
1031 {
1032         struct scsi_device *sdev = to_scsi_device(dev);
1033         ssize_t count;
1034
1035         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1036         if (count > 0) {
1037                 buf[count] = '\n';
1038                 count++;
1039         }
1040         return count;
1041 }
1042 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1043
1044 #define BLIST_FLAG_NAME(name)                                   \
1045         [const_ilog2((__force __u64)BLIST_##name)] = #name
1046 static const char *const sdev_bflags_name[] = {
1047 #include "scsi_devinfo_tbl.c"
1048 };
1049 #undef BLIST_FLAG_NAME
1050
1051 static ssize_t
1052 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1053                     char *buf)
1054 {
1055         struct scsi_device *sdev = to_scsi_device(dev);
1056         int i;
1057         ssize_t len = 0;
1058
1059         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1060                 const char *name = NULL;
1061
1062                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1063                         continue;
1064                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1065                         name = sdev_bflags_name[i];
1066
1067                 if (name)
1068                         len += snprintf(buf + len, PAGE_SIZE - len,
1069                                         "%s%s", len ? " " : "", name);
1070                 else
1071                         len += snprintf(buf + len, PAGE_SIZE - len,
1072                                         "%sINVALID_BIT(%d)", len ? " " : "", i);
1073         }
1074         if (len)
1075                 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
1076         return len;
1077 }
1078 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1079
1080 #ifdef CONFIG_SCSI_DH
1081 static ssize_t
1082 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1083                    char *buf)
1084 {
1085         struct scsi_device *sdev = to_scsi_device(dev);
1086
1087         if (!sdev->handler)
1088                 return snprintf(buf, 20, "detached\n");
1089
1090         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1091 }
1092
1093 static ssize_t
1094 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1095                     const char *buf, size_t count)
1096 {
1097         struct scsi_device *sdev = to_scsi_device(dev);
1098         int err = -EINVAL;
1099
1100         if (sdev->sdev_state == SDEV_CANCEL ||
1101             sdev->sdev_state == SDEV_DEL)
1102                 return -ENODEV;
1103
1104         if (!sdev->handler) {
1105                 /*
1106                  * Attach to a device handler
1107                  */
1108                 err = scsi_dh_attach(sdev->request_queue, buf);
1109         } else if (!strncmp(buf, "activate", 8)) {
1110                 /*
1111                  * Activate a device handler
1112                  */
1113                 if (sdev->handler->activate)
1114                         err = sdev->handler->activate(sdev, NULL, NULL);
1115                 else
1116                         err = 0;
1117         } else if (!strncmp(buf, "detach", 6)) {
1118                 /*
1119                  * Detach from a device handler
1120                  */
1121                 sdev_printk(KERN_WARNING, sdev,
1122                             "can't detach handler %s.\n",
1123                             sdev->handler->name);
1124                 err = -EINVAL;
1125         }
1126
1127         return err < 0 ? err : count;
1128 }
1129
1130 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1131                    sdev_store_dh_state);
1132
1133 static ssize_t
1134 sdev_show_access_state(struct device *dev,
1135                        struct device_attribute *attr,
1136                        char *buf)
1137 {
1138         struct scsi_device *sdev = to_scsi_device(dev);
1139         unsigned char access_state;
1140         const char *access_state_name;
1141
1142         if (!sdev->handler)
1143                 return -EINVAL;
1144
1145         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1146         access_state_name = scsi_access_state_name(access_state);
1147
1148         return sprintf(buf, "%s\n",
1149                        access_state_name ? access_state_name : "unknown");
1150 }
1151 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1152
1153 static ssize_t
1154 sdev_show_preferred_path(struct device *dev,
1155                          struct device_attribute *attr,
1156                          char *buf)
1157 {
1158         struct scsi_device *sdev = to_scsi_device(dev);
1159
1160         if (!sdev->handler)
1161                 return -EINVAL;
1162
1163         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1164                 return sprintf(buf, "1\n");
1165         else
1166                 return sprintf(buf, "0\n");
1167 }
1168 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1169 #endif
1170
1171 static ssize_t
1172 sdev_show_queue_ramp_up_period(struct device *dev,
1173                                struct device_attribute *attr,
1174                                char *buf)
1175 {
1176         struct scsi_device *sdev;
1177         sdev = to_scsi_device(dev);
1178         return snprintf(buf, 20, "%u\n",
1179                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1180 }
1181
1182 static ssize_t
1183 sdev_store_queue_ramp_up_period(struct device *dev,
1184                                 struct device_attribute *attr,
1185                                 const char *buf, size_t count)
1186 {
1187         struct scsi_device *sdev = to_scsi_device(dev);
1188         unsigned int period;
1189
1190         if (kstrtouint(buf, 10, &period))
1191                 return -EINVAL;
1192
1193         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1194         return count;
1195 }
1196
1197 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1198                    sdev_show_queue_ramp_up_period,
1199                    sdev_store_queue_ramp_up_period);
1200
1201 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1202                                          struct attribute *attr, int i)
1203 {
1204         struct device *dev = container_of(kobj, struct device, kobj);
1205         struct scsi_device *sdev = to_scsi_device(dev);
1206
1207
1208         if (attr == &dev_attr_queue_depth.attr &&
1209             !sdev->host->hostt->change_queue_depth)
1210                 return S_IRUGO;
1211
1212         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1213             !sdev->host->hostt->change_queue_depth)
1214                 return 0;
1215
1216 #ifdef CONFIG_SCSI_DH
1217         if (attr == &dev_attr_access_state.attr &&
1218             !sdev->handler)
1219                 return 0;
1220         if (attr == &dev_attr_preferred_path.attr &&
1221             !sdev->handler)
1222                 return 0;
1223 #endif
1224         return attr->mode;
1225 }
1226
1227 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1228                                              struct bin_attribute *attr, int i)
1229 {
1230         struct device *dev = container_of(kobj, struct device, kobj);
1231         struct scsi_device *sdev = to_scsi_device(dev);
1232
1233
1234         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1235                 return 0;
1236
1237         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1238                 return 0;
1239
1240         return S_IRUGO;
1241 }
1242
1243 /* Default template for device attributes.  May NOT be modified */
1244 static struct attribute *scsi_sdev_attrs[] = {
1245         &dev_attr_device_blocked.attr,
1246         &dev_attr_type.attr,
1247         &dev_attr_scsi_level.attr,
1248         &dev_attr_device_busy.attr,
1249         &dev_attr_vendor.attr,
1250         &dev_attr_model.attr,
1251         &dev_attr_rev.attr,
1252         &dev_attr_rescan.attr,
1253         &dev_attr_delete.attr,
1254         &dev_attr_state.attr,
1255         &dev_attr_timeout.attr,
1256         &dev_attr_eh_timeout.attr,
1257         &dev_attr_iocounterbits.attr,
1258         &dev_attr_iorequest_cnt.attr,
1259         &dev_attr_iodone_cnt.attr,
1260         &dev_attr_ioerr_cnt.attr,
1261         &dev_attr_modalias.attr,
1262         &dev_attr_queue_depth.attr,
1263         &dev_attr_queue_type.attr,
1264         &dev_attr_wwid.attr,
1265         &dev_attr_blacklist.attr,
1266 #ifdef CONFIG_SCSI_DH
1267         &dev_attr_dh_state.attr,
1268         &dev_attr_access_state.attr,
1269         &dev_attr_preferred_path.attr,
1270 #endif
1271         &dev_attr_queue_ramp_up_period.attr,
1272         REF_EVT(media_change),
1273         REF_EVT(inquiry_change_reported),
1274         REF_EVT(capacity_change_reported),
1275         REF_EVT(soft_threshold_reached),
1276         REF_EVT(mode_parameter_change_reported),
1277         REF_EVT(lun_change_reported),
1278         NULL
1279 };
1280
1281 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1282         &dev_attr_vpd_pg83,
1283         &dev_attr_vpd_pg80,
1284         &dev_attr_inquiry,
1285         NULL
1286 };
1287 static struct attribute_group scsi_sdev_attr_group = {
1288         .attrs =        scsi_sdev_attrs,
1289         .bin_attrs =    scsi_sdev_bin_attrs,
1290         .is_visible =   scsi_sdev_attr_is_visible,
1291         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1292 };
1293
1294 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1295         &scsi_sdev_attr_group,
1296         NULL
1297 };
1298
1299 static int scsi_target_add(struct scsi_target *starget)
1300 {
1301         int error;
1302
1303         if (starget->state != STARGET_CREATED)
1304                 return 0;
1305
1306         error = device_add(&starget->dev);
1307         if (error) {
1308                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1309                 return error;
1310         }
1311         transport_add_device(&starget->dev);
1312         starget->state = STARGET_RUNNING;
1313
1314         pm_runtime_set_active(&starget->dev);
1315         pm_runtime_enable(&starget->dev);
1316         device_enable_async_suspend(&starget->dev);
1317
1318         return 0;
1319 }
1320
1321 /**
1322  * scsi_sysfs_add_sdev - add scsi device to sysfs
1323  * @sdev:       scsi_device to add
1324  *
1325  * Return value:
1326  *      0 on Success / non-zero on Failure
1327  **/
1328 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1329 {
1330         int error, i;
1331         struct request_queue *rq = sdev->request_queue;
1332         struct scsi_target *starget = sdev->sdev_target;
1333
1334         error = scsi_target_add(starget);
1335         if (error)
1336                 return error;
1337
1338         transport_configure_device(&starget->dev);
1339
1340         device_enable_async_suspend(&sdev->sdev_gendev);
1341         scsi_autopm_get_target(starget);
1342         pm_runtime_set_active(&sdev->sdev_gendev);
1343         pm_runtime_forbid(&sdev->sdev_gendev);
1344         pm_runtime_enable(&sdev->sdev_gendev);
1345         scsi_autopm_put_target(starget);
1346
1347         scsi_autopm_get_device(sdev);
1348
1349         scsi_dh_add_device(sdev);
1350
1351         error = device_add(&sdev->sdev_gendev);
1352         if (error) {
1353                 sdev_printk(KERN_INFO, sdev,
1354                                 "failed to add device: %d\n", error);
1355                 return error;
1356         }
1357
1358         device_enable_async_suspend(&sdev->sdev_dev);
1359         error = device_add(&sdev->sdev_dev);
1360         if (error) {
1361                 sdev_printk(KERN_INFO, sdev,
1362                                 "failed to add class device: %d\n", error);
1363                 device_del(&sdev->sdev_gendev);
1364                 return error;
1365         }
1366         transport_add_device(&sdev->sdev_gendev);
1367         sdev->is_visible = 1;
1368
1369         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1370         if (error)
1371                 /* we're treating error on bsg register as non-fatal,
1372                  * so pretend nothing went wrong */
1373                 sdev_printk(KERN_INFO, sdev,
1374                             "Failed to register bsg queue, errno=%d\n", error);
1375
1376         /* add additional host specific attributes */
1377         if (sdev->host->hostt->sdev_attrs) {
1378                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1379                         error = device_create_file(&sdev->sdev_gendev,
1380                                         sdev->host->hostt->sdev_attrs[i]);
1381                         if (error)
1382                                 return error;
1383                 }
1384         }
1385
1386         if (sdev->host->hostt->sdev_groups) {
1387                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1388                                 sdev->host->hostt->sdev_groups);
1389                 if (error)
1390                         return error;
1391         }
1392
1393         scsi_autopm_put_device(sdev);
1394         return error;
1395 }
1396
1397 void __scsi_remove_device(struct scsi_device *sdev)
1398 {
1399         struct device *dev = &sdev->sdev_gendev;
1400         int res;
1401
1402         /*
1403          * This cleanup path is not reentrant and while it is impossible
1404          * to get a new reference with scsi_device_get() someone can still
1405          * hold a previously acquired one.
1406          */
1407         if (sdev->sdev_state == SDEV_DEL)
1408                 return;
1409
1410         if (sdev->is_visible) {
1411                 /*
1412                  * If scsi_internal_target_block() is running concurrently,
1413                  * wait until it has finished before changing the device state.
1414                  */
1415                 mutex_lock(&sdev->state_mutex);
1416                 /*
1417                  * If blocked, we go straight to DEL and restart the queue so
1418                  * any commands issued during driver shutdown (like sync
1419                  * cache) are errored immediately.
1420                  */
1421                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1422                 if (res != 0) {
1423                         res = scsi_device_set_state(sdev, SDEV_DEL);
1424                         if (res == 0)
1425                                 scsi_start_queue(sdev);
1426                 }
1427                 mutex_unlock(&sdev->state_mutex);
1428
1429                 if (res != 0)
1430                         return;
1431
1432                 if (sdev->host->hostt->sdev_groups)
1433                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1434                                         sdev->host->hostt->sdev_groups);
1435
1436                 bsg_unregister_queue(sdev->request_queue);
1437                 device_unregister(&sdev->sdev_dev);
1438                 transport_remove_device(dev);
1439                 device_del(dev);
1440         } else
1441                 put_device(&sdev->sdev_dev);
1442
1443         /*
1444          * Stop accepting new requests and wait until all queuecommand() and
1445          * scsi_run_queue() invocations have finished before tearing down the
1446          * device.
1447          */
1448         mutex_lock(&sdev->state_mutex);
1449         scsi_device_set_state(sdev, SDEV_DEL);
1450         mutex_unlock(&sdev->state_mutex);
1451
1452         blk_cleanup_queue(sdev->request_queue);
1453         cancel_work_sync(&sdev->requeue_work);
1454
1455         if (sdev->host->hostt->slave_destroy)
1456                 sdev->host->hostt->slave_destroy(sdev);
1457         transport_destroy_device(dev);
1458
1459         /*
1460          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1461          * remoed sysfs visibility from the device, so make the target
1462          * invisible if this was the last device underneath it.
1463          */
1464         scsi_target_reap(scsi_target(sdev));
1465
1466         put_device(dev);
1467 }
1468
1469 /**
1470  * scsi_remove_device - unregister a device from the scsi bus
1471  * @sdev:       scsi_device to unregister
1472  **/
1473 void scsi_remove_device(struct scsi_device *sdev)
1474 {
1475         struct Scsi_Host *shost = sdev->host;
1476
1477         mutex_lock(&shost->scan_mutex);
1478         __scsi_remove_device(sdev);
1479         mutex_unlock(&shost->scan_mutex);
1480 }
1481 EXPORT_SYMBOL(scsi_remove_device);
1482
1483 static void __scsi_remove_target(struct scsi_target *starget)
1484 {
1485         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1486         unsigned long flags;
1487         struct scsi_device *sdev;
1488
1489         spin_lock_irqsave(shost->host_lock, flags);
1490  restart:
1491         list_for_each_entry(sdev, &shost->__devices, siblings) {
1492                 /*
1493                  * We cannot call scsi_device_get() here, as
1494                  * we might've been called from rmmod() causing
1495                  * scsi_device_get() to fail the module_is_live()
1496                  * check.
1497                  */
1498                 if (sdev->channel != starget->channel ||
1499                     sdev->id != starget->id)
1500                         continue;
1501                 if (sdev->sdev_state == SDEV_DEL ||
1502                     sdev->sdev_state == SDEV_CANCEL ||
1503                     !get_device(&sdev->sdev_gendev))
1504                         continue;
1505                 spin_unlock_irqrestore(shost->host_lock, flags);
1506                 scsi_remove_device(sdev);
1507                 put_device(&sdev->sdev_gendev);
1508                 spin_lock_irqsave(shost->host_lock, flags);
1509                 goto restart;
1510         }
1511         spin_unlock_irqrestore(shost->host_lock, flags);
1512 }
1513
1514 /**
1515  * scsi_remove_target - try to remove a target and all its devices
1516  * @dev: generic starget or parent of generic stargets to be removed
1517  *
1518  * Note: This is slightly racy.  It is possible that if the user
1519  * requests the addition of another device then the target won't be
1520  * removed.
1521  */
1522 void scsi_remove_target(struct device *dev)
1523 {
1524         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1525         struct scsi_target *starget;
1526         unsigned long flags;
1527
1528 restart:
1529         spin_lock_irqsave(shost->host_lock, flags);
1530         list_for_each_entry(starget, &shost->__targets, siblings) {
1531                 if (starget->state == STARGET_DEL ||
1532                     starget->state == STARGET_REMOVE ||
1533                     starget->state == STARGET_CREATED_REMOVE)
1534                         continue;
1535                 if (starget->dev.parent == dev || &starget->dev == dev) {
1536                         kref_get(&starget->reap_ref);
1537                         if (starget->state == STARGET_CREATED)
1538                                 starget->state = STARGET_CREATED_REMOVE;
1539                         else
1540                                 starget->state = STARGET_REMOVE;
1541                         spin_unlock_irqrestore(shost->host_lock, flags);
1542                         __scsi_remove_target(starget);
1543                         scsi_target_reap(starget);
1544                         goto restart;
1545                 }
1546         }
1547         spin_unlock_irqrestore(shost->host_lock, flags);
1548 }
1549 EXPORT_SYMBOL(scsi_remove_target);
1550
1551 int scsi_register_driver(struct device_driver *drv)
1552 {
1553         drv->bus = &scsi_bus_type;
1554
1555         return driver_register(drv);
1556 }
1557 EXPORT_SYMBOL(scsi_register_driver);
1558
1559 int scsi_register_interface(struct class_interface *intf)
1560 {
1561         intf->class = &sdev_class;
1562
1563         return class_interface_register(intf);
1564 }
1565 EXPORT_SYMBOL(scsi_register_interface);
1566
1567 /**
1568  * scsi_sysfs_add_host - add scsi host to subsystem
1569  * @shost:     scsi host struct to add to subsystem
1570  **/
1571 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1572 {
1573         int error, i;
1574
1575         /* add host specific attributes */
1576         if (shost->hostt->shost_attrs) {
1577                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1578                         error = device_create_file(&shost->shost_dev,
1579                                         shost->hostt->shost_attrs[i]);
1580                         if (error)
1581                                 return error;
1582                 }
1583         }
1584
1585         transport_register_device(&shost->shost_gendev);
1586         transport_configure_device(&shost->shost_gendev);
1587         return 0;
1588 }
1589
1590 static struct device_type scsi_dev_type = {
1591         .name =         "scsi_device",
1592         .release =      scsi_device_dev_release,
1593         .groups =       scsi_sdev_attr_groups,
1594 };
1595
1596 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1597 {
1598         unsigned long flags;
1599         struct Scsi_Host *shost = sdev->host;
1600         struct scsi_target  *starget = sdev->sdev_target;
1601
1602         device_initialize(&sdev->sdev_gendev);
1603         sdev->sdev_gendev.bus = &scsi_bus_type;
1604         sdev->sdev_gendev.type = &scsi_dev_type;
1605         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1606                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1607
1608         device_initialize(&sdev->sdev_dev);
1609         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1610         sdev->sdev_dev.class = &sdev_class;
1611         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1612                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1613         /*
1614          * Get a default scsi_level from the target (derived from sibling
1615          * devices).  This is the best we can do for guessing how to set
1616          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1617          * setting doesn't matter, because all the bits are zero anyway.
1618          * But it does matter for higher LUNs.
1619          */
1620         sdev->scsi_level = starget->scsi_level;
1621         if (sdev->scsi_level <= SCSI_2 &&
1622                         sdev->scsi_level != SCSI_UNKNOWN &&
1623                         !shost->no_scsi2_lun_in_cdb)
1624                 sdev->lun_in_cdb = 1;
1625
1626         transport_setup_device(&sdev->sdev_gendev);
1627         spin_lock_irqsave(shost->host_lock, flags);
1628         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1629         list_add_tail(&sdev->siblings, &shost->__devices);
1630         spin_unlock_irqrestore(shost->host_lock, flags);
1631         /*
1632          * device can now only be removed via __scsi_remove_device() so hold
1633          * the target.  Target will be held in CREATED state until something
1634          * beneath it becomes visible (in which case it moves to RUNNING)
1635          */
1636         kref_get(&starget->reap_ref);
1637 }
1638
1639 int scsi_is_sdev_device(const struct device *dev)
1640 {
1641         return dev->type == &scsi_dev_type;
1642 }
1643 EXPORT_SYMBOL(scsi_is_sdev_device);
1644
1645 /* A blank transport template that is used in drivers that don't
1646  * yet implement Transport Attributes */
1647 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };