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
28static struct device_type scsi_dev_type;
29
30static 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
45const 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
59static 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};
71const 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
86static 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
99static 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
114static 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
131static 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) \
159static ssize_t \
160show_##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) \
173static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
174
175#define shost_rd_attr(field, format_string) \
176shost_rd_attr2(field, field, format_string)
177
178/*
179 * Create the actual show/store functions and data structures.
180 */
181
182static ssize_t
183store_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};
194static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
195
196static ssize_t
197store_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
220static ssize_t
221show_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 */
233static struct device_attribute dev_attr_hstate =
234 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
235
236static ssize_t
237show_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
252static ssize_t
253show_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
266static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
267
268static ssize_t
269show_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
280static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
281
282static 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
292static ssize_t
293store_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
310exit_store_host_reset:
311 if (ret == 0)
312 ret = count;
313 return ret;
314}
315
316static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
317
318static ssize_t
319show_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
329static ssize_t
330store_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
368static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
369
370shost_rd_attr(unique_id, "%u\n");
371shost_rd_attr(cmd_per_lun, "%hd\n");
372shost_rd_attr(can_queue, "%hd\n");
373shost_rd_attr(sg_tablesize, "%hu\n");
374shost_rd_attr(sg_prot_tablesize, "%hu\n");
375shost_rd_attr(unchecked_isa_dma, "%d\n");
376shost_rd_attr(prot_capabilities, "%u\n");
377shost_rd_attr(prot_guard_type, "%hd\n");
378shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
379
380static ssize_t
381show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
382{
383 struct Scsi_Host *shost = class_to_shost(dev);
384 return snprintf(buf, 20, "%d\n", scsi_host_busy(shost));
385}
386static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
387
388static ssize_t
389show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
390{
391 return sprintf(buf, "1\n");
392}
393static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
394
395static struct attribute *scsi_sysfs_shost_attrs[] = {
396 &dev_attr_use_blk_mq.attr,
397 &dev_attr_unique_id.attr,
398 &dev_attr_host_busy.attr,
399 &dev_attr_cmd_per_lun.attr,
400 &dev_attr_can_queue.attr,
401 &dev_attr_sg_tablesize.attr,
402 &dev_attr_sg_prot_tablesize.attr,
403 &dev_attr_unchecked_isa_dma.attr,
404 &dev_attr_proc_name.attr,
405 &dev_attr_scan.attr,
406 &dev_attr_hstate.attr,
407 &dev_attr_supported_mode.attr,
408 &dev_attr_active_mode.attr,
409 &dev_attr_prot_capabilities.attr,
410 &dev_attr_prot_guard_type.attr,
411 &dev_attr_host_reset.attr,
412 &dev_attr_eh_deadline.attr,
413 NULL
414};
415
416static struct attribute_group scsi_shost_attr_group = {
417 .attrs = scsi_sysfs_shost_attrs,
418};
419
420const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
421 &scsi_shost_attr_group,
422 NULL
423};
424
425static void scsi_device_cls_release(struct device *class_dev)
426{
427 struct scsi_device *sdev;
428
429 sdev = class_to_sdev(class_dev);
430 put_device(&sdev->sdev_gendev);
431}
432
433static void scsi_device_dev_release_usercontext(struct work_struct *work)
434{
435 struct scsi_device *sdev;
436 struct device *parent;
437 struct list_head *this, *tmp;
438 struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
439 unsigned long flags;
440
441 sdev = container_of(work, struct scsi_device, ew.work);
442
443 scsi_dh_release_device(sdev);
444
445 parent = sdev->sdev_gendev.parent;
446
447 spin_lock_irqsave(sdev->host->host_lock, flags);
448 list_del(&sdev->siblings);
449 list_del(&sdev->same_target_siblings);
450 list_del(&sdev->starved_entry);
451 spin_unlock_irqrestore(sdev->host->host_lock, flags);
452
453 cancel_work_sync(&sdev->event_work);
454
455 list_for_each_safe(this, tmp, &sdev->event_list) {
456 struct scsi_event *evt;
457
458 evt = list_entry(this, struct scsi_event, node);
459 list_del(&evt->node);
460 kfree(evt);
461 }
462
463 blk_put_queue(sdev->request_queue);
464 /* NULL queue means the device can't be used */
465 sdev->request_queue = NULL;
466
467 mutex_lock(&sdev->inquiry_mutex);
468 rcu_swap_protected(sdev->vpd_pg80, vpd_pg80,
469 lockdep_is_held(&sdev->inquiry_mutex));
470 rcu_swap_protected(sdev->vpd_pg83, vpd_pg83,
471 lockdep_is_held(&sdev->inquiry_mutex));
472 mutex_unlock(&sdev->inquiry_mutex);
473
474 if (vpd_pg83)
475 kfree_rcu(vpd_pg83, rcu);
476 if (vpd_pg80)
477 kfree_rcu(vpd_pg80, rcu);
478 kfree(sdev->inquiry);
479 kfree(sdev);
480
481 if (parent)
482 put_device(parent);
483}
484
485static void scsi_device_dev_release(struct device *dev)
486{
487 struct scsi_device *sdp = to_scsi_device(dev);
488 execute_in_process_context(scsi_device_dev_release_usercontext,
489 &sdp->ew);
490}
491
492static struct class sdev_class = {
493 .name = "scsi_device",
494 .dev_release = scsi_device_cls_release,
495};
496
497/* all probing is done in the individual ->probe routines */
498static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
499{
500 struct scsi_device *sdp;
501
502 if (dev->type != &scsi_dev_type)
503 return 0;
504
505 sdp = to_scsi_device(dev);
506 if (sdp->no_uld_attach)
507 return 0;
508 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
509}
510
511static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
512{
513 struct scsi_device *sdev;
514
515 if (dev->type != &scsi_dev_type)
516 return 0;
517
518 sdev = to_scsi_device(dev);
519
520 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
521 return 0;
522}
523
524struct bus_type scsi_bus_type = {
525 .name = "scsi",
526 .match = scsi_bus_match,
527 .uevent = scsi_bus_uevent,
528#ifdef CONFIG_PM
529 .pm = &scsi_bus_pm_ops,
530#endif
531};
532EXPORT_SYMBOL_GPL(scsi_bus_type);
533
534int scsi_sysfs_register(void)
535{
536 int error;
537
538 error = bus_register(&scsi_bus_type);
539 if (!error) {
540 error = class_register(&sdev_class);
541 if (error)
542 bus_unregister(&scsi_bus_type);
543 }
544
545 return error;
546}
547
548void scsi_sysfs_unregister(void)
549{
550 class_unregister(&sdev_class);
551 bus_unregister(&scsi_bus_type);
552}
553
554/*
555 * sdev_show_function: macro to create an attr function that can be used to
556 * show a non-bit field.
557 */
558#define sdev_show_function(field, format_string) \
559static ssize_t \
560sdev_show_##field (struct device *dev, struct device_attribute *attr, \
561 char *buf) \
562{ \
563 struct scsi_device *sdev; \
564 sdev = to_scsi_device(dev); \
565 return snprintf (buf, 20, format_string, sdev->field); \
566} \
567
568/*
569 * sdev_rd_attr: macro to create a function and attribute variable for a
570 * read only field.
571 */
572#define sdev_rd_attr(field, format_string) \
573 sdev_show_function(field, format_string) \
574static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
575
576
577/*
578 * sdev_rw_attr: create a function and attribute variable for a
579 * read/write field.
580 */
581#define sdev_rw_attr(field, format_string) \
582 sdev_show_function(field, format_string) \
583 \
584static ssize_t \
585sdev_store_##field (struct device *dev, struct device_attribute *attr, \
586 const char *buf, size_t count) \
587{ \
588 struct scsi_device *sdev; \
589 sdev = to_scsi_device(dev); \
590 sscanf (buf, format_string, &sdev->field); \
591 return count; \
592} \
593static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
594
595/* Currently we don't export bit fields, but we might in future,
596 * so leave this code in */
597#if 0
598/*
599 * sdev_rd_attr: create a function and attribute variable for a
600 * read/write bit field.
601 */
602#define sdev_rw_attr_bit(field) \
603 sdev_show_function(field, "%d\n") \
604 \
605static ssize_t \
606sdev_store_##field (struct device *dev, struct device_attribute *attr, \
607 const char *buf, size_t count) \
608{ \
609 int ret; \
610 struct scsi_device *sdev; \
611 ret = scsi_sdev_check_buf_bit(buf); \
612 if (ret >= 0) { \
613 sdev = to_scsi_device(dev); \
614 sdev->field = ret; \
615 ret = count; \
616 } \
617 return ret; \
618} \
619static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
620
621/*
622 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
623 * else return -EINVAL.
624 */
625static int scsi_sdev_check_buf_bit(const char *buf)
626{
627 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
628 if (buf[0] == '1')
629 return 1;
630 else if (buf[0] == '0')
631 return 0;
632 else
633 return -EINVAL;
634 } else
635 return -EINVAL;
636}
637#endif
638/*
639 * Create the actual show/store functions and data structures.
640 */
641sdev_rd_attr (type, "%d\n");
642sdev_rd_attr (scsi_level, "%d\n");
643sdev_rd_attr (vendor, "%.8s\n");
644sdev_rd_attr (model, "%.16s\n");
645sdev_rd_attr (rev, "%.4s\n");
646
647static ssize_t
648sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
649 char *buf)
650{
651 struct scsi_device *sdev = to_scsi_device(dev);
652 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
653}
654static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
655
656static ssize_t
657sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
658 char *buf)
659{
660 struct scsi_device *sdev = to_scsi_device(dev);
661 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
662}
663static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
664
665/*
666 * TODO: can we make these symlinks to the block layer ones?
667 */
668static ssize_t
669sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
670{
671 struct scsi_device *sdev;
672 sdev = to_scsi_device(dev);
673 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
674}
675
676static ssize_t
677sdev_store_timeout (struct device *dev, struct device_attribute *attr,
678 const char *buf, size_t count)
679{
680 struct scsi_device *sdev;
681 int timeout;
682 sdev = to_scsi_device(dev);
683 sscanf (buf, "%d\n", &timeout);
684 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
685 return count;
686}
687static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
688
689static ssize_t
690sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
691{
692 struct scsi_device *sdev;
693 sdev = to_scsi_device(dev);
694 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
695}
696
697static ssize_t
698sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
699 const char *buf, size_t count)
700{
701 struct scsi_device *sdev;
702 unsigned int eh_timeout;
703 int err;
704
705 if (!capable(CAP_SYS_ADMIN))
706 return -EACCES;
707
708 sdev = to_scsi_device(dev);
709 err = kstrtouint(buf, 10, &eh_timeout);
710 if (err)
711 return err;
712 sdev->eh_timeout = eh_timeout * HZ;
713
714 return count;
715}
716static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
717
718static ssize_t
719store_rescan_field (struct device *dev, struct device_attribute *attr,
720 const char *buf, size_t count)
721{
722 scsi_rescan_device(dev);
723 return count;
724}
725static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
726
727static ssize_t
728sdev_store_delete(struct device *dev, struct device_attribute *attr,
729 const char *buf, size_t count)
730{
731 struct kernfs_node *kn;
732
733 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
734 WARN_ON_ONCE(!kn);
735 /*
736 * Concurrent writes into the "delete" sysfs attribute may trigger
737 * concurrent calls to device_remove_file() and scsi_remove_device().
738 * device_remove_file() handles concurrent removal calls by
739 * serializing these and by ignoring the second and later removal
740 * attempts. Concurrent calls of scsi_remove_device() are
741 * serialized. The second and later calls of scsi_remove_device() are
742 * ignored because the first call of that function changes the device
743 * state into SDEV_DEL.
744 */
745 device_remove_file(dev, attr);
746 scsi_remove_device(to_scsi_device(dev));
747 if (kn)
748 sysfs_unbreak_active_protection(kn);
749 return count;
750};
751static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
752
753static ssize_t
754store_state_field(struct device *dev, struct device_attribute *attr,
755 const char *buf, size_t count)
756{
757 int i, ret;
758 struct scsi_device *sdev = to_scsi_device(dev);
759 enum scsi_device_state state = 0;
760
761 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
762 const int len = strlen(sdev_states[i].name);
763 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
764 buf[len] == '\n') {
765 state = sdev_states[i].value;
766 break;
767 }
768 }
769 if (!state)
770 return -EINVAL;
771
772 mutex_lock(&sdev->state_mutex);
773 ret = scsi_device_set_state(sdev, state);
774 mutex_unlock(&sdev->state_mutex);
775
776 return ret == 0 ? count : -EINVAL;
777}
778
779static ssize_t
780show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
781{
782 struct scsi_device *sdev = to_scsi_device(dev);
783 const char *name = scsi_device_state_name(sdev->sdev_state);
784
785 if (!name)
786 return -EINVAL;
787
788 return snprintf(buf, 20, "%s\n", name);
789}
790
791static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
792
793static ssize_t
794show_queue_type_field(struct device *dev, struct device_attribute *attr,
795 char *buf)
796{
797 struct scsi_device *sdev = to_scsi_device(dev);
798 const char *name = "none";
799
800 if (sdev->simple_tags)
801 name = "simple";
802
803 return snprintf(buf, 20, "%s\n", name);
804}
805
806static ssize_t
807store_queue_type_field(struct device *dev, struct device_attribute *attr,
808 const char *buf, size_t count)
809{
810 struct scsi_device *sdev = to_scsi_device(dev);
811
812 if (!sdev->tagged_supported)
813 return -EINVAL;
814
815 sdev_printk(KERN_INFO, sdev,
816 "ignoring write to deprecated queue_type attribute");
817 return count;
818}
819
820static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
821 store_queue_type_field);
822
823#define sdev_vpd_pg_attr(_page) \
824static ssize_t \
825show_vpd_##_page(struct file *filp, struct kobject *kobj, \
826 struct bin_attribute *bin_attr, \
827 char *buf, loff_t off, size_t count) \
828{ \
829 struct device *dev = container_of(kobj, struct device, kobj); \
830 struct scsi_device *sdev = to_scsi_device(dev); \
831 struct scsi_vpd *vpd_page; \
832 int ret = -EINVAL; \
833 \
834 rcu_read_lock(); \
835 vpd_page = rcu_dereference(sdev->vpd_##_page); \
836 if (vpd_page) \
837 ret = memory_read_from_buffer(buf, count, &off, \
838 vpd_page->data, vpd_page->len); \
839 rcu_read_unlock(); \
840 return ret; \
841} \
842static struct bin_attribute dev_attr_vpd_##_page = { \
843 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
844 .size = 0, \
845 .read = show_vpd_##_page, \
846};
847
848sdev_vpd_pg_attr(pg83);
849sdev_vpd_pg_attr(pg80);
850
851static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
852 struct bin_attribute *bin_attr,
853 char *buf, loff_t off, size_t count)
854{
855 struct device *dev = container_of(kobj, struct device, kobj);
856 struct scsi_device *sdev = to_scsi_device(dev);
857
858 if (!sdev->inquiry)
859 return -EINVAL;
860
861 return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
862 sdev->inquiry_len);
863}
864
865static struct bin_attribute dev_attr_inquiry = {
866 .attr = {
867 .name = "inquiry",
868 .mode = S_IRUGO,
869 },
870 .size = 0,
871 .read = show_inquiry,
872};
873
874static ssize_t
875show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
876 char *buf)
877{
878 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
879}
880
881static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
882
883#define show_sdev_iostat(field) \
884static ssize_t \
885show_iostat_##field(struct device *dev, struct device_attribute *attr, \
886 char *buf) \
887{ \
888 struct scsi_device *sdev = to_scsi_device(dev); \
889 unsigned long long count = atomic_read(&sdev->field); \
890 return snprintf(buf, 20, "0x%llx\n", count); \
891} \
892static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
893
894show_sdev_iostat(iorequest_cnt);
895show_sdev_iostat(iodone_cnt);
896show_sdev_iostat(ioerr_cnt);
897
898static ssize_t
899sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
900{
901 struct scsi_device *sdev;
902 sdev = to_scsi_device(dev);
903 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
904}
905static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
906
907#define DECLARE_EVT_SHOW(name, Cap_name) \
908static ssize_t \
909sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
910 char *buf) \
911{ \
912 struct scsi_device *sdev = to_scsi_device(dev); \
913 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
914 return snprintf(buf, 20, "%d\n", val); \
915}
916
917#define DECLARE_EVT_STORE(name, Cap_name) \
918static ssize_t \
919sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
920 const char *buf, size_t count) \
921{ \
922 struct scsi_device *sdev = to_scsi_device(dev); \
923 int val = simple_strtoul(buf, NULL, 0); \
924 if (val == 0) \
925 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
926 else if (val == 1) \
927 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
928 else \
929 return -EINVAL; \
930 return count; \
931}
932
933#define DECLARE_EVT(name, Cap_name) \
934 DECLARE_EVT_SHOW(name, Cap_name) \
935 DECLARE_EVT_STORE(name, Cap_name) \
936 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
937 sdev_store_evt_##name);
938#define REF_EVT(name) &dev_attr_evt_##name.attr
939
940DECLARE_EVT(media_change, MEDIA_CHANGE)
941DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
942DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
943DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
944DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
945DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
946
947static ssize_t
948sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
949 const char *buf, size_t count)
950{
951 int depth, retval;
952 struct scsi_device *sdev = to_scsi_device(dev);
953 struct scsi_host_template *sht = sdev->host->hostt;
954
955 if (!sht->change_queue_depth)
956 return -EINVAL;
957
958 depth = simple_strtoul(buf, NULL, 0);
959
960 if (depth < 1 || depth > sdev->host->can_queue)
961 return -EINVAL;
962
963 retval = sht->change_queue_depth(sdev, depth);
964 if (retval < 0)
965 return retval;
966
967 sdev->max_queue_depth = sdev->queue_depth;
968
969 return count;
970}
971sdev_show_function(queue_depth, "%d\n");
972
973static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
974 sdev_store_queue_depth);
975
976static ssize_t
977sdev_show_wwid(struct device *dev, struct device_attribute *attr,
978 char *buf)
979{
980 struct scsi_device *sdev = to_scsi_device(dev);
981 ssize_t count;
982
983 count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
984 if (count > 0) {
985 buf[count] = '\n';
986 count++;
987 }
988 return count;
989}
990static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
991
992#define BLIST_FLAG_NAME(name) \
993 [const_ilog2((__force __u64)BLIST_##name)] = #name
994static const char *const sdev_bflags_name[] = {
995#include "scsi_devinfo_tbl.c"
996};
997#undef BLIST_FLAG_NAME
998
999static ssize_t
1000sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1001 char *buf)
1002{
1003 struct scsi_device *sdev = to_scsi_device(dev);
1004 int i;
1005 ssize_t len = 0;
1006
1007 for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1008 const char *name = NULL;
1009
1010 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1011 continue;
1012 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1013 name = sdev_bflags_name[i];
1014
1015 if (name)
1016 len += snprintf(buf + len, PAGE_SIZE - len,
1017 "%s%s", len ? " " : "", name);
1018 else
1019 len += snprintf(buf + len, PAGE_SIZE - len,
1020 "%sINVALID_BIT(%d)", len ? " " : "", i);
1021 }
1022 if (len)
1023 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
1024 return len;
1025}
1026static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1027
1028#ifdef CONFIG_SCSI_DH
1029static ssize_t
1030sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1031 char *buf)
1032{
1033 struct scsi_device *sdev = to_scsi_device(dev);
1034
1035 if (!sdev->handler)
1036 return snprintf(buf, 20, "detached\n");
1037
1038 return snprintf(buf, 20, "%s\n", sdev->handler->name);
1039}
1040
1041static ssize_t
1042sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1043 const char *buf, size_t count)
1044{
1045 struct scsi_device *sdev = to_scsi_device(dev);
1046 int err = -EINVAL;
1047
1048 if (sdev->sdev_state == SDEV_CANCEL ||
1049 sdev->sdev_state == SDEV_DEL)
1050 return -ENODEV;
1051
1052 if (!sdev->handler) {
1053 /*
1054 * Attach to a device handler
1055 */
1056 err = scsi_dh_attach(sdev->request_queue, buf);
1057 } else if (!strncmp(buf, "activate", 8)) {
1058 /*
1059 * Activate a device handler
1060 */
1061 if (sdev->handler->activate)
1062 err = sdev->handler->activate(sdev, NULL, NULL);
1063 else
1064 err = 0;
1065 } else if (!strncmp(buf, "detach", 6)) {
1066 /*
1067 * Detach from a device handler
1068 */
1069 sdev_printk(KERN_WARNING, sdev,
1070 "can't detach handler %s.\n",
1071 sdev->handler->name);
1072 err = -EINVAL;
1073 }
1074
1075 return err < 0 ? err : count;
1076}
1077
1078static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1079 sdev_store_dh_state);
1080
1081static ssize_t
1082sdev_show_access_state(struct device *dev,
1083 struct device_attribute *attr,
1084 char *buf)
1085{
1086 struct scsi_device *sdev = to_scsi_device(dev);
1087 unsigned char access_state;
1088 const char *access_state_name;
1089
1090 if (!sdev->handler)
1091 return -EINVAL;
1092
1093 access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1094 access_state_name = scsi_access_state_name(access_state);
1095
1096 return sprintf(buf, "%s\n",
1097 access_state_name ? access_state_name : "unknown");
1098}
1099static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1100
1101static ssize_t
1102sdev_show_preferred_path(struct device *dev,
1103 struct device_attribute *attr,
1104 char *buf)
1105{
1106 struct scsi_device *sdev = to_scsi_device(dev);
1107
1108 if (!sdev->handler)
1109 return -EINVAL;
1110
1111 if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1112 return sprintf(buf, "1\n");
1113 else
1114 return sprintf(buf, "0\n");
1115}
1116static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1117#endif
1118
1119static ssize_t
1120sdev_show_queue_ramp_up_period(struct device *dev,
1121 struct device_attribute *attr,
1122 char *buf)
1123{
1124 struct scsi_device *sdev;
1125 sdev = to_scsi_device(dev);
1126 return snprintf(buf, 20, "%u\n",
1127 jiffies_to_msecs(sdev->queue_ramp_up_period));
1128}
1129
1130static ssize_t
1131sdev_store_queue_ramp_up_period(struct device *dev,
1132 struct device_attribute *attr,
1133 const char *buf, size_t count)
1134{
1135 struct scsi_device *sdev = to_scsi_device(dev);
1136 unsigned int period;
1137
1138 if (kstrtouint(buf, 10, &period))
1139 return -EINVAL;
1140
1141 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1142 return count;
1143}
1144
1145static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1146 sdev_show_queue_ramp_up_period,
1147 sdev_store_queue_ramp_up_period);
1148
1149static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1150 struct attribute *attr, int i)
1151{
1152 struct device *dev = container_of(kobj, struct device, kobj);
1153 struct scsi_device *sdev = to_scsi_device(dev);
1154
1155
1156 if (attr == &dev_attr_queue_depth.attr &&
1157 !sdev->host->hostt->change_queue_depth)
1158 return S_IRUGO;
1159
1160 if (attr == &dev_attr_queue_ramp_up_period.attr &&
1161 !sdev->host->hostt->change_queue_depth)
1162 return 0;
1163
1164#ifdef CONFIG_SCSI_DH
1165 if (attr == &dev_attr_access_state.attr &&
1166 !sdev->handler)
1167 return 0;
1168 if (attr == &dev_attr_preferred_path.attr &&
1169 !sdev->handler)
1170 return 0;
1171#endif
1172 return attr->mode;
1173}
1174
1175static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1176 struct bin_attribute *attr, int i)
1177{
1178 struct device *dev = container_of(kobj, struct device, kobj);
1179 struct scsi_device *sdev = to_scsi_device(dev);
1180
1181
1182 if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1183 return 0;
1184
1185 if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1186 return 0;
1187
1188 return S_IRUGO;
1189}
1190
1191/* Default template for device attributes. May NOT be modified */
1192static struct attribute *scsi_sdev_attrs[] = {
1193 &dev_attr_device_blocked.attr,
1194 &dev_attr_type.attr,
1195 &dev_attr_scsi_level.attr,
1196 &dev_attr_device_busy.attr,
1197 &dev_attr_vendor.attr,
1198 &dev_attr_model.attr,
1199 &dev_attr_rev.attr,
1200 &dev_attr_rescan.attr,
1201 &dev_attr_delete.attr,
1202 &dev_attr_state.attr,
1203 &dev_attr_timeout.attr,
1204 &dev_attr_eh_timeout.attr,
1205 &dev_attr_iocounterbits.attr,
1206 &dev_attr_iorequest_cnt.attr,
1207 &dev_attr_iodone_cnt.attr,
1208 &dev_attr_ioerr_cnt.attr,
1209 &dev_attr_modalias.attr,
1210 &dev_attr_queue_depth.attr,
1211 &dev_attr_queue_type.attr,
1212 &dev_attr_wwid.attr,
1213 &dev_attr_blacklist.attr,
1214#ifdef CONFIG_SCSI_DH
1215 &dev_attr_dh_state.attr,
1216 &dev_attr_access_state.attr,
1217 &dev_attr_preferred_path.attr,
1218#endif
1219 &dev_attr_queue_ramp_up_period.attr,
1220 REF_EVT(media_change),
1221 REF_EVT(inquiry_change_reported),
1222 REF_EVT(capacity_change_reported),
1223 REF_EVT(soft_threshold_reached),
1224 REF_EVT(mode_parameter_change_reported),
1225 REF_EVT(lun_change_reported),
1226 NULL
1227};
1228
1229static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1230 &dev_attr_vpd_pg83,
1231 &dev_attr_vpd_pg80,
1232 &dev_attr_inquiry,
1233 NULL
1234};
1235static struct attribute_group scsi_sdev_attr_group = {
1236 .attrs = scsi_sdev_attrs,
1237 .bin_attrs = scsi_sdev_bin_attrs,
1238 .is_visible = scsi_sdev_attr_is_visible,
1239 .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1240};
1241
1242static const struct attribute_group *scsi_sdev_attr_groups[] = {
1243 &scsi_sdev_attr_group,
1244 NULL
1245};
1246
1247static int scsi_target_add(struct scsi_target *starget)
1248{
1249 int error;
1250
1251 if (starget->state != STARGET_CREATED)
1252 return 0;
1253
1254 error = device_add(&starget->dev);
1255 if (error) {
1256 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1257 return error;
1258 }
1259 transport_add_device(&starget->dev);
1260 starget->state = STARGET_RUNNING;
1261
1262 pm_runtime_set_active(&starget->dev);
1263 pm_runtime_enable(&starget->dev);
1264 device_enable_async_suspend(&starget->dev);
1265
1266 return 0;
1267}
1268
1269/**
1270 * scsi_sysfs_add_sdev - add scsi device to sysfs
1271 * @sdev: scsi_device to add
1272 *
1273 * Return value:
1274 * 0 on Success / non-zero on Failure
1275 **/
1276int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1277{
1278 int error, i;
1279 struct request_queue *rq = sdev->request_queue;
1280 struct scsi_target *starget = sdev->sdev_target;
1281
1282 error = scsi_target_add(starget);
1283 if (error)
1284 return error;
1285
1286 transport_configure_device(&starget->dev);
1287
1288 device_enable_async_suspend(&sdev->sdev_gendev);
1289 scsi_autopm_get_target(starget);
1290 pm_runtime_set_active(&sdev->sdev_gendev);
1291 pm_runtime_forbid(&sdev->sdev_gendev);
1292 pm_runtime_enable(&sdev->sdev_gendev);
1293 scsi_autopm_put_target(starget);
1294
1295 scsi_autopm_get_device(sdev);
1296
1297 scsi_dh_add_device(sdev);
1298
1299 error = device_add(&sdev->sdev_gendev);
1300 if (error) {
1301 sdev_printk(KERN_INFO, sdev,
1302 "failed to add device: %d\n", error);
1303 return error;
1304 }
1305
1306 device_enable_async_suspend(&sdev->sdev_dev);
1307 error = device_add(&sdev->sdev_dev);
1308 if (error) {
1309 sdev_printk(KERN_INFO, sdev,
1310 "failed to add class device: %d\n", error);
1311 device_del(&sdev->sdev_gendev);
1312 return error;
1313 }
1314 transport_add_device(&sdev->sdev_gendev);
1315 sdev->is_visible = 1;
1316
1317 error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1318 if (error)
1319 /* we're treating error on bsg register as non-fatal,
1320 * so pretend nothing went wrong */
1321 sdev_printk(KERN_INFO, sdev,
1322 "Failed to register bsg queue, errno=%d\n", error);
1323
1324 /* add additional host specific attributes */
1325 if (sdev->host->hostt->sdev_attrs) {
1326 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1327 error = device_create_file(&sdev->sdev_gendev,
1328 sdev->host->hostt->sdev_attrs[i]);
1329 if (error)
1330 return error;
1331 }
1332 }
1333
1334 if (sdev->host->hostt->sdev_groups) {
1335 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1336 sdev->host->hostt->sdev_groups);
1337 if (error)
1338 return error;
1339 }
1340
1341 scsi_autopm_put_device(sdev);
1342 return error;
1343}
1344
1345void __scsi_remove_device(struct scsi_device *sdev)
1346{
1347 struct device *dev = &sdev->sdev_gendev;
1348 int res;
1349
1350 /*
1351 * This cleanup path is not reentrant and while it is impossible
1352 * to get a new reference with scsi_device_get() someone can still
1353 * hold a previously acquired one.
1354 */
1355 if (sdev->sdev_state == SDEV_DEL)
1356 return;
1357
1358 if (sdev->is_visible) {
1359 /*
1360 * If scsi_internal_target_block() is running concurrently,
1361 * wait until it has finished before changing the device state.
1362 */
1363 mutex_lock(&sdev->state_mutex);
1364 /*
1365 * If blocked, we go straight to DEL and restart the queue so
1366 * any commands issued during driver shutdown (like sync
1367 * cache) are errored immediately.
1368 */
1369 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1370 if (res != 0) {
1371 res = scsi_device_set_state(sdev, SDEV_DEL);
1372 if (res == 0)
1373 scsi_start_queue(sdev);
1374 }
1375 mutex_unlock(&sdev->state_mutex);
1376
1377 if (res != 0)
1378 return;
1379
1380 if (sdev->host->hostt->sdev_groups)
1381 sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1382 sdev->host->hostt->sdev_groups);
1383
1384 bsg_unregister_queue(sdev->request_queue);
1385 device_unregister(&sdev->sdev_dev);
1386 transport_remove_device(dev);
1387 device_del(dev);
1388 } else
1389 put_device(&sdev->sdev_dev);
1390
1391 /*
1392 * Stop accepting new requests and wait until all queuecommand() and
1393 * scsi_run_queue() invocations have finished before tearing down the
1394 * device.
1395 */
1396 mutex_lock(&sdev->state_mutex);
1397 scsi_device_set_state(sdev, SDEV_DEL);
1398 mutex_unlock(&sdev->state_mutex);
1399
1400 blk_cleanup_queue(sdev->request_queue);
1401 cancel_work_sync(&sdev->requeue_work);
1402
1403 if (sdev->host->hostt->slave_destroy)
1404 sdev->host->hostt->slave_destroy(sdev);
1405 transport_destroy_device(dev);
1406
1407 /*
1408 * Paired with the kref_get() in scsi_sysfs_initialize(). We have
1409 * remoed sysfs visibility from the device, so make the target
1410 * invisible if this was the last device underneath it.
1411 */
1412 scsi_target_reap(scsi_target(sdev));
1413
1414 put_device(dev);
1415}
1416
1417/**
1418 * scsi_remove_device - unregister a device from the scsi bus
1419 * @sdev: scsi_device to unregister
1420 **/
1421void scsi_remove_device(struct scsi_device *sdev)
1422{
1423 struct Scsi_Host *shost = sdev->host;
1424
1425 mutex_lock(&shost->scan_mutex);
1426 __scsi_remove_device(sdev);
1427 mutex_unlock(&shost->scan_mutex);
1428}
1429EXPORT_SYMBOL(scsi_remove_device);
1430
1431static void __scsi_remove_target(struct scsi_target *starget)
1432{
1433 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1434 unsigned long flags;
1435 struct scsi_device *sdev;
1436
1437 spin_lock_irqsave(shost->host_lock, flags);
1438 restart:
1439 list_for_each_entry(sdev, &shost->__devices, siblings) {
1440 /*
1441 * We cannot call scsi_device_get() here, as
1442 * we might've been called from rmmod() causing
1443 * scsi_device_get() to fail the module_is_live()
1444 * check.
1445 */
1446 if (sdev->channel != starget->channel ||
1447 sdev->id != starget->id)
1448 continue;
1449 if (sdev->sdev_state == SDEV_DEL ||
1450 sdev->sdev_state == SDEV_CANCEL ||
1451 !get_device(&sdev->sdev_gendev))
1452 continue;
1453 spin_unlock_irqrestore(shost->host_lock, flags);
1454 scsi_remove_device(sdev);
1455 put_device(&sdev->sdev_gendev);
1456 spin_lock_irqsave(shost->host_lock, flags);
1457 goto restart;
1458 }
1459 spin_unlock_irqrestore(shost->host_lock, flags);
1460}
1461
1462/**
1463 * scsi_remove_target - try to remove a target and all its devices
1464 * @dev: generic starget or parent of generic stargets to be removed
1465 *
1466 * Note: This is slightly racy. It is possible that if the user
1467 * requests the addition of another device then the target won't be
1468 * removed.
1469 */
1470void scsi_remove_target(struct device *dev)
1471{
1472 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1473 struct scsi_target *starget;
1474 unsigned long flags;
1475
1476restart:
1477 spin_lock_irqsave(shost->host_lock, flags);
1478 list_for_each_entry(starget, &shost->__targets, siblings) {
1479 if (starget->state == STARGET_DEL ||
1480 starget->state == STARGET_REMOVE ||
1481 starget->state == STARGET_CREATED_REMOVE)
1482 continue;
1483 if (starget->dev.parent == dev || &starget->dev == dev) {
1484 kref_get(&starget->reap_ref);
1485 if (starget->state == STARGET_CREATED)
1486 starget->state = STARGET_CREATED_REMOVE;
1487 else
1488 starget->state = STARGET_REMOVE;
1489 spin_unlock_irqrestore(shost->host_lock, flags);
1490 __scsi_remove_target(starget);
1491 scsi_target_reap(starget);
1492 goto restart;
1493 }
1494 }
1495 spin_unlock_irqrestore(shost->host_lock, flags);
1496}
1497EXPORT_SYMBOL(scsi_remove_target);
1498
1499int scsi_register_driver(struct device_driver *drv)
1500{
1501 drv->bus = &scsi_bus_type;
1502
1503 return driver_register(drv);
1504}
1505EXPORT_SYMBOL(scsi_register_driver);
1506
1507int scsi_register_interface(struct class_interface *intf)
1508{
1509 intf->class = &sdev_class;
1510
1511 return class_interface_register(intf);
1512}
1513EXPORT_SYMBOL(scsi_register_interface);
1514
1515/**
1516 * scsi_sysfs_add_host - add scsi host to subsystem
1517 * @shost: scsi host struct to add to subsystem
1518 **/
1519int scsi_sysfs_add_host(struct Scsi_Host *shost)
1520{
1521 int error, i;
1522
1523 /* add host specific attributes */
1524 if (shost->hostt->shost_attrs) {
1525 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1526 error = device_create_file(&shost->shost_dev,
1527 shost->hostt->shost_attrs[i]);
1528 if (error)
1529 return error;
1530 }
1531 }
1532
1533 transport_register_device(&shost->shost_gendev);
1534 transport_configure_device(&shost->shost_gendev);
1535 return 0;
1536}
1537
1538static struct device_type scsi_dev_type = {
1539 .name = "scsi_device",
1540 .release = scsi_device_dev_release,
1541 .groups = scsi_sdev_attr_groups,
1542};
1543
1544void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1545{
1546 unsigned long flags;
1547 struct Scsi_Host *shost = sdev->host;
1548 struct scsi_target *starget = sdev->sdev_target;
1549
1550 device_initialize(&sdev->sdev_gendev);
1551 sdev->sdev_gendev.bus = &scsi_bus_type;
1552 sdev->sdev_gendev.type = &scsi_dev_type;
1553 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1554 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1555
1556 device_initialize(&sdev->sdev_dev);
1557 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1558 sdev->sdev_dev.class = &sdev_class;
1559 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1560 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1561 /*
1562 * Get a default scsi_level from the target (derived from sibling
1563 * devices). This is the best we can do for guessing how to set
1564 * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the
1565 * setting doesn't matter, because all the bits are zero anyway.
1566 * But it does matter for higher LUNs.
1567 */
1568 sdev->scsi_level = starget->scsi_level;
1569 if (sdev->scsi_level <= SCSI_2 &&
1570 sdev->scsi_level != SCSI_UNKNOWN &&
1571 !shost->no_scsi2_lun_in_cdb)
1572 sdev->lun_in_cdb = 1;
1573
1574 transport_setup_device(&sdev->sdev_gendev);
1575 spin_lock_irqsave(shost->host_lock, flags);
1576 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1577 list_add_tail(&sdev->siblings, &shost->__devices);
1578 spin_unlock_irqrestore(shost->host_lock, flags);
1579 /*
1580 * device can now only be removed via __scsi_remove_device() so hold
1581 * the target. Target will be held in CREATED state until something
1582 * beneath it becomes visible (in which case it moves to RUNNING)
1583 */
1584 kref_get(&starget->reap_ref);
1585}
1586
1587int scsi_is_sdev_device(const struct device *dev)
1588{
1589 return dev->type == &scsi_dev_type;
1590}
1591EXPORT_SYMBOL(scsi_is_sdev_device);
1592
1593/* A blank transport template that is used in drivers that don't
1594 * yet implement Transport Attributes */
1595struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
1596