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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_transport.h>
21#include <scsi/scsi_driver.h>
22
23#include "scsi_priv.h"
24#include "scsi_logging.h"
25
26static struct device_type scsi_dev_type;
27
28static const struct {
29 enum scsi_device_state value;
30 char *name;
31} sdev_states[] = {
32 { SDEV_CREATED, "created" },
33 { SDEV_RUNNING, "running" },
34 { SDEV_CANCEL, "cancel" },
35 { SDEV_DEL, "deleted" },
36 { SDEV_QUIESCE, "quiesce" },
37 { SDEV_OFFLINE, "offline" },
38 { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
39 { SDEV_BLOCK, "blocked" },
40 { SDEV_CREATED_BLOCK, "created-blocked" },
41};
42
43const char *scsi_device_state_name(enum scsi_device_state state)
44{
45 int i;
46 char *name = NULL;
47
48 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
49 if (sdev_states[i].value == state) {
50 name = sdev_states[i].name;
51 break;
52 }
53 }
54 return name;
55}
56
57static const struct {
58 enum scsi_host_state value;
59 char *name;
60} shost_states[] = {
61 { SHOST_CREATED, "created" },
62 { SHOST_RUNNING, "running" },
63 { SHOST_CANCEL, "cancel" },
64 { SHOST_DEL, "deleted" },
65 { SHOST_RECOVERY, "recovery" },
66 { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
67 { SHOST_DEL_RECOVERY, "deleted/recovery", },
68};
69const char *scsi_host_state_name(enum scsi_host_state state)
70{
71 int i;
72 char *name = NULL;
73
74 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
75 if (shost_states[i].value == state) {
76 name = shost_states[i].name;
77 break;
78 }
79 }
80 return name;
81}
82
83static int check_set(unsigned int *val, char *src)
84{
85 char *last;
86
87 if (strncmp(src, "-", 20) == 0) {
88 *val = SCAN_WILD_CARD;
89 } else {
90 /*
91 * Doesn't check for int overflow
92 */
93 *val = simple_strtoul(src, &last, 0);
94 if (*last != '\0')
95 return 1;
96 }
97 return 0;
98}
99
100static int scsi_scan(struct Scsi_Host *shost, const char *str)
101{
102 char s1[15], s2[15], s3[15], junk;
103 unsigned int channel, id, lun;
104 int res;
105
106 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
107 if (res != 3)
108 return -EINVAL;
109 if (check_set(&channel, s1))
110 return -EINVAL;
111 if (check_set(&id, s2))
112 return -EINVAL;
113 if (check_set(&lun, s3))
114 return -EINVAL;
115 if (shost->transportt->user_scan)
116 res = shost->transportt->user_scan(shost, channel, id, lun);
117 else
118 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
119 return res;
120}
121
122/*
123 * shost_show_function: macro to create an attr function that can be used to
124 * show a non-bit field.
125 */
126#define shost_show_function(name, field, format_string) \
127static ssize_t \
128show_##name (struct device *dev, struct device_attribute *attr, \
129 char *buf) \
130{ \
131 struct Scsi_Host *shost = class_to_shost(dev); \
132 return snprintf (buf, 20, format_string, shost->field); \
133}
134
135/*
136 * shost_rd_attr: macro to create a function and attribute variable for a
137 * read only field.
138 */
139#define shost_rd_attr2(name, field, format_string) \
140 shost_show_function(name, field, format_string) \
141static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
142
143#define shost_rd_attr(field, format_string) \
144shost_rd_attr2(field, field, format_string)
145
146/*
147 * Create the actual show/store functions and data structures.
148 */
149
150static ssize_t
151store_scan(struct device *dev, struct device_attribute *attr,
152 const char *buf, size_t count)
153{
154 struct Scsi_Host *shost = class_to_shost(dev);
155 int res;
156
157 res = scsi_scan(shost, buf);
158 if (res == 0)
159 res = count;
160 return res;
161};
162static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
163
164static ssize_t
165store_shost_state(struct device *dev, struct device_attribute *attr,
166 const char *buf, size_t count)
167{
168 int i;
169 struct Scsi_Host *shost = class_to_shost(dev);
170 enum scsi_host_state state = 0;
171
172 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
173 const int len = strlen(shost_states[i].name);
174 if (strncmp(shost_states[i].name, buf, len) == 0 &&
175 buf[len] == '\n') {
176 state = shost_states[i].value;
177 break;
178 }
179 }
180 if (!state)
181 return -EINVAL;
182
183 if (scsi_host_set_state(shost, state))
184 return -EINVAL;
185 return count;
186}
187
188static ssize_t
189show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
190{
191 struct Scsi_Host *shost = class_to_shost(dev);
192 const char *name = scsi_host_state_name(shost->shost_state);
193
194 if (!name)
195 return -EINVAL;
196
197 return snprintf(buf, 20, "%s\n", name);
198}
199
200/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
201struct device_attribute dev_attr_hstate =
202 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
203
204static ssize_t
205show_shost_mode(unsigned int mode, char *buf)
206{
207 ssize_t len = 0;
208
209 if (mode & MODE_INITIATOR)
210 len = sprintf(buf, "%s", "Initiator");
211
212 if (mode & MODE_TARGET)
213 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
214
215 len += sprintf(buf + len, "\n");
216
217 return len;
218}
219
220static ssize_t
221show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
222 char *buf)
223{
224 struct Scsi_Host *shost = class_to_shost(dev);
225 unsigned int supported_mode = shost->hostt->supported_mode;
226
227 if (supported_mode == MODE_UNKNOWN)
228 /* by default this should be initiator */
229 supported_mode = MODE_INITIATOR;
230
231 return show_shost_mode(supported_mode, buf);
232}
233
234static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
235
236static ssize_t
237show_shost_active_mode(struct device *dev,
238 struct device_attribute *attr, char *buf)
239{
240 struct Scsi_Host *shost = class_to_shost(dev);
241
242 if (shost->active_mode == MODE_UNKNOWN)
243 return snprintf(buf, 20, "unknown\n");
244 else
245 return show_shost_mode(shost->active_mode, buf);
246}
247
248static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
249
250static int check_reset_type(const char *str)
251{
252 if (sysfs_streq(str, "adapter"))
253 return SCSI_ADAPTER_RESET;
254 else if (sysfs_streq(str, "firmware"))
255 return SCSI_FIRMWARE_RESET;
256 else
257 return 0;
258}
259
260static ssize_t
261store_host_reset(struct device *dev, struct device_attribute *attr,
262 const char *buf, size_t count)
263{
264 struct Scsi_Host *shost = class_to_shost(dev);
265 struct scsi_host_template *sht = shost->hostt;
266 int ret = -EINVAL;
267 int type;
268
269 type = check_reset_type(buf);
270 if (!type)
271 goto exit_store_host_reset;
272
273 if (sht->host_reset)
274 ret = sht->host_reset(shost, type);
275
276exit_store_host_reset:
277 if (ret == 0)
278 ret = count;
279 return ret;
280}
281
282static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
283
284static ssize_t
285show_shost_eh_deadline(struct device *dev,
286 struct device_attribute *attr, char *buf)
287{
288 struct Scsi_Host *shost = class_to_shost(dev);
289
290 if (shost->eh_deadline == -1)
291 return snprintf(buf, strlen("off") + 2, "off\n");
292 return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
293}
294
295static ssize_t
296store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
297 const char *buf, size_t count)
298{
299 struct Scsi_Host *shost = class_to_shost(dev);
300 int ret = -EINVAL;
301 unsigned long deadline, flags;
302
303 if (shost->transportt &&
304 (shost->transportt->eh_strategy_handler ||
305 !shost->hostt->eh_host_reset_handler))
306 return ret;
307
308 if (!strncmp(buf, "off", strlen("off")))
309 deadline = -1;
310 else {
311 ret = kstrtoul(buf, 10, &deadline);
312 if (ret)
313 return ret;
314 if (deadline * HZ > UINT_MAX)
315 return -EINVAL;
316 }
317
318 spin_lock_irqsave(shost->host_lock, flags);
319 if (scsi_host_in_recovery(shost))
320 ret = -EBUSY;
321 else {
322 if (deadline == -1)
323 shost->eh_deadline = -1;
324 else
325 shost->eh_deadline = deadline * HZ;
326
327 ret = count;
328 }
329 spin_unlock_irqrestore(shost->host_lock, flags);
330
331 return ret;
332}
333
334static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
335
336shost_rd_attr(unique_id, "%u\n");
337shost_rd_attr(host_busy, "%hu\n");
338shost_rd_attr(cmd_per_lun, "%hd\n");
339shost_rd_attr(can_queue, "%hd\n");
340shost_rd_attr(sg_tablesize, "%hu\n");
341shost_rd_attr(sg_prot_tablesize, "%hu\n");
342shost_rd_attr(unchecked_isa_dma, "%d\n");
343shost_rd_attr(prot_capabilities, "%u\n");
344shost_rd_attr(prot_guard_type, "%hd\n");
345shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
346
347static struct attribute *scsi_sysfs_shost_attrs[] = {
348 &dev_attr_unique_id.attr,
349 &dev_attr_host_busy.attr,
350 &dev_attr_cmd_per_lun.attr,
351 &dev_attr_can_queue.attr,
352 &dev_attr_sg_tablesize.attr,
353 &dev_attr_sg_prot_tablesize.attr,
354 &dev_attr_unchecked_isa_dma.attr,
355 &dev_attr_proc_name.attr,
356 &dev_attr_scan.attr,
357 &dev_attr_hstate.attr,
358 &dev_attr_supported_mode.attr,
359 &dev_attr_active_mode.attr,
360 &dev_attr_prot_capabilities.attr,
361 &dev_attr_prot_guard_type.attr,
362 &dev_attr_host_reset.attr,
363 &dev_attr_eh_deadline.attr,
364 NULL
365};
366
367struct attribute_group scsi_shost_attr_group = {
368 .attrs = scsi_sysfs_shost_attrs,
369};
370
371const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
372 &scsi_shost_attr_group,
373 NULL
374};
375
376static void scsi_device_cls_release(struct device *class_dev)
377{
378 struct scsi_device *sdev;
379
380 sdev = class_to_sdev(class_dev);
381 put_device(&sdev->sdev_gendev);
382}
383
384static void scsi_device_dev_release_usercontext(struct work_struct *work)
385{
386 struct scsi_device *sdev;
387 struct device *parent;
388 struct list_head *this, *tmp;
389 unsigned long flags;
390
391 sdev = container_of(work, struct scsi_device, ew.work);
392
393 parent = sdev->sdev_gendev.parent;
394
395 spin_lock_irqsave(sdev->host->host_lock, flags);
396 list_del(&sdev->siblings);
397 list_del(&sdev->same_target_siblings);
398 list_del(&sdev->starved_entry);
399 spin_unlock_irqrestore(sdev->host->host_lock, flags);
400
401 cancel_work_sync(&sdev->event_work);
402
403 list_for_each_safe(this, tmp, &sdev->event_list) {
404 struct scsi_event *evt;
405
406 evt = list_entry(this, struct scsi_event, node);
407 list_del(&evt->node);
408 kfree(evt);
409 }
410
411 blk_put_queue(sdev->request_queue);
412 /* NULL queue means the device can't be used */
413 sdev->request_queue = NULL;
414
415 kfree(sdev->vpd_pg83);
416 kfree(sdev->vpd_pg80);
417 kfree(sdev->inquiry);
418 kfree(sdev);
419
420 if (parent)
421 put_device(parent);
422}
423
424static void scsi_device_dev_release(struct device *dev)
425{
426 struct scsi_device *sdp = to_scsi_device(dev);
427 execute_in_process_context(scsi_device_dev_release_usercontext,
428 &sdp->ew);
429}
430
431static struct class sdev_class = {
432 .name = "scsi_device",
433 .dev_release = scsi_device_cls_release,
434};
435
436/* all probing is done in the individual ->probe routines */
437static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
438{
439 struct scsi_device *sdp;
440
441 if (dev->type != &scsi_dev_type)
442 return 0;
443
444 sdp = to_scsi_device(dev);
445 if (sdp->no_uld_attach)
446 return 0;
447 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
448}
449
450static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
451{
452 struct scsi_device *sdev;
453
454 if (dev->type != &scsi_dev_type)
455 return 0;
456
457 sdev = to_scsi_device(dev);
458
459 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
460 return 0;
461}
462
463struct bus_type scsi_bus_type = {
464 .name = "scsi",
465 .match = scsi_bus_match,
466 .uevent = scsi_bus_uevent,
467#ifdef CONFIG_PM
468 .pm = &scsi_bus_pm_ops,
469#endif
470};
471EXPORT_SYMBOL_GPL(scsi_bus_type);
472
473int scsi_sysfs_register(void)
474{
475 int error;
476
477 error = bus_register(&scsi_bus_type);
478 if (!error) {
479 error = class_register(&sdev_class);
480 if (error)
481 bus_unregister(&scsi_bus_type);
482 }
483
484 return error;
485}
486
487void scsi_sysfs_unregister(void)
488{
489 class_unregister(&sdev_class);
490 bus_unregister(&scsi_bus_type);
491}
492
493/*
494 * sdev_show_function: macro to create an attr function that can be used to
495 * show a non-bit field.
496 */
497#define sdev_show_function(field, format_string) \
498static ssize_t \
499sdev_show_##field (struct device *dev, struct device_attribute *attr, \
500 char *buf) \
501{ \
502 struct scsi_device *sdev; \
503 sdev = to_scsi_device(dev); \
504 return snprintf (buf, 20, format_string, sdev->field); \
505} \
506
507/*
508 * sdev_rd_attr: macro to create a function and attribute variable for a
509 * read only field.
510 */
511#define sdev_rd_attr(field, format_string) \
512 sdev_show_function(field, format_string) \
513static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
514
515
516/*
517 * sdev_rw_attr: create a function and attribute variable for a
518 * read/write field.
519 */
520#define sdev_rw_attr(field, format_string) \
521 sdev_show_function(field, format_string) \
522 \
523static ssize_t \
524sdev_store_##field (struct device *dev, struct device_attribute *attr, \
525 const char *buf, size_t count) \
526{ \
527 struct scsi_device *sdev; \
528 sdev = to_scsi_device(dev); \
529 sscanf (buf, format_string, &sdev->field); \
530 return count; \
531} \
532static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
533
534/* Currently we don't export bit fields, but we might in future,
535 * so leave this code in */
536#if 0
537/*
538 * sdev_rd_attr: create a function and attribute variable for a
539 * read/write bit field.
540 */
541#define sdev_rw_attr_bit(field) \
542 sdev_show_function(field, "%d\n") \
543 \
544static ssize_t \
545sdev_store_##field (struct device *dev, struct device_attribute *attr, \
546 const char *buf, size_t count) \
547{ \
548 int ret; \
549 struct scsi_device *sdev; \
550 ret = scsi_sdev_check_buf_bit(buf); \
551 if (ret >= 0) { \
552 sdev = to_scsi_device(dev); \
553 sdev->field = ret; \
554 ret = count; \
555 } \
556 return ret; \
557} \
558static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
559
560/*
561 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
562 * else return -EINVAL.
563 */
564static int scsi_sdev_check_buf_bit(const char *buf)
565{
566 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
567 if (buf[0] == '1')
568 return 1;
569 else if (buf[0] == '0')
570 return 0;
571 else
572 return -EINVAL;
573 } else
574 return -EINVAL;
575}
576#endif
577/*
578 * Create the actual show/store functions and data structures.
579 */
580sdev_rd_attr (device_blocked, "%d\n");
581sdev_rd_attr (device_busy, "%d\n");
582sdev_rd_attr (type, "%d\n");
583sdev_rd_attr (scsi_level, "%d\n");
584sdev_rd_attr (vendor, "%.8s\n");
585sdev_rd_attr (model, "%.16s\n");
586sdev_rd_attr (rev, "%.4s\n");
587
588/*
589 * TODO: can we make these symlinks to the block layer ones?
590 */
591static ssize_t
592sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
593{
594 struct scsi_device *sdev;
595 sdev = to_scsi_device(dev);
596 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
597}
598
599static ssize_t
600sdev_store_timeout (struct device *dev, struct device_attribute *attr,
601 const char *buf, size_t count)
602{
603 struct scsi_device *sdev;
604 int timeout;
605 sdev = to_scsi_device(dev);
606 sscanf (buf, "%d\n", &timeout);
607 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
608 return count;
609}
610static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
611
612static ssize_t
613sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
614{
615 struct scsi_device *sdev;
616 sdev = to_scsi_device(dev);
617 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
618}
619
620static ssize_t
621sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
622 const char *buf, size_t count)
623{
624 struct scsi_device *sdev;
625 unsigned int eh_timeout;
626 int err;
627
628 if (!capable(CAP_SYS_ADMIN))
629 return -EACCES;
630
631 sdev = to_scsi_device(dev);
632 err = kstrtouint(buf, 10, &eh_timeout);
633 if (err)
634 return err;
635 sdev->eh_timeout = eh_timeout * HZ;
636
637 return count;
638}
639static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
640
641static ssize_t
642store_rescan_field (struct device *dev, struct device_attribute *attr,
643 const char *buf, size_t count)
644{
645 scsi_rescan_device(dev);
646 return count;
647}
648static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
649
650static ssize_t
651sdev_store_delete(struct device *dev, struct device_attribute *attr,
652 const char *buf, size_t count)
653{
654 if (device_remove_file_self(dev, attr))
655 scsi_remove_device(to_scsi_device(dev));
656 return count;
657};
658static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
659
660static ssize_t
661store_state_field(struct device *dev, struct device_attribute *attr,
662 const char *buf, size_t count)
663{
664 int i;
665 struct scsi_device *sdev = to_scsi_device(dev);
666 enum scsi_device_state state = 0;
667
668 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
669 const int len = strlen(sdev_states[i].name);
670 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
671 buf[len] == '\n') {
672 state = sdev_states[i].value;
673 break;
674 }
675 }
676 if (!state)
677 return -EINVAL;
678
679 if (scsi_device_set_state(sdev, state))
680 return -EINVAL;
681 return count;
682}
683
684static ssize_t
685show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
686{
687 struct scsi_device *sdev = to_scsi_device(dev);
688 const char *name = scsi_device_state_name(sdev->sdev_state);
689
690 if (!name)
691 return -EINVAL;
692
693 return snprintf(buf, 20, "%s\n", name);
694}
695
696static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
697
698static ssize_t
699show_queue_type_field(struct device *dev, struct device_attribute *attr,
700 char *buf)
701{
702 struct scsi_device *sdev = to_scsi_device(dev);
703 const char *name = "none";
704
705 if (sdev->ordered_tags)
706 name = "ordered";
707 else if (sdev->simple_tags)
708 name = "simple";
709
710 return snprintf(buf, 20, "%s\n", name);
711}
712
713static ssize_t
714store_queue_type_field(struct device *dev, struct device_attribute *attr,
715 const char *buf, size_t count)
716{
717 struct scsi_device *sdev = to_scsi_device(dev);
718 struct scsi_host_template *sht = sdev->host->hostt;
719 int tag_type = 0, retval;
720 int prev_tag_type = scsi_get_tag_type(sdev);
721
722 if (!sdev->tagged_supported || !sht->change_queue_type)
723 return -EINVAL;
724
725 if (strncmp(buf, "ordered", 7) == 0)
726 tag_type = MSG_ORDERED_TAG;
727 else if (strncmp(buf, "simple", 6) == 0)
728 tag_type = MSG_SIMPLE_TAG;
729 else if (strncmp(buf, "none", 4) != 0)
730 return -EINVAL;
731
732 if (tag_type == prev_tag_type)
733 return count;
734
735 retval = sht->change_queue_type(sdev, tag_type);
736 if (retval < 0)
737 return retval;
738
739 return count;
740}
741
742static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
743 store_queue_type_field);
744
745#define sdev_vpd_pg_attr(_page) \
746static ssize_t \
747show_vpd_##_page(struct file *filp, struct kobject *kobj, \
748 struct bin_attribute *bin_attr, \
749 char *buf, loff_t off, size_t count) \
750{ \
751 struct device *dev = container_of(kobj, struct device, kobj); \
752 struct scsi_device *sdev = to_scsi_device(dev); \
753 if (!sdev->vpd_##_page) \
754 return -EINVAL; \
755 return memory_read_from_buffer(buf, count, &off, \
756 sdev->vpd_##_page, \
757 sdev->vpd_##_page##_len); \
758} \
759static struct bin_attribute dev_attr_vpd_##_page = { \
760 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
761 .size = 0, \
762 .read = show_vpd_##_page, \
763};
764
765sdev_vpd_pg_attr(pg83);
766sdev_vpd_pg_attr(pg80);
767
768static ssize_t
769show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
770 char *buf)
771{
772 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
773}
774
775static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
776
777#define show_sdev_iostat(field) \
778static ssize_t \
779show_iostat_##field(struct device *dev, struct device_attribute *attr, \
780 char *buf) \
781{ \
782 struct scsi_device *sdev = to_scsi_device(dev); \
783 unsigned long long count = atomic_read(&sdev->field); \
784 return snprintf(buf, 20, "0x%llx\n", count); \
785} \
786static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
787
788show_sdev_iostat(iorequest_cnt);
789show_sdev_iostat(iodone_cnt);
790show_sdev_iostat(ioerr_cnt);
791
792static ssize_t
793sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
794{
795 struct scsi_device *sdev;
796 sdev = to_scsi_device(dev);
797 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
798}
799static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
800
801#define DECLARE_EVT_SHOW(name, Cap_name) \
802static ssize_t \
803sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
804 char *buf) \
805{ \
806 struct scsi_device *sdev = to_scsi_device(dev); \
807 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
808 return snprintf(buf, 20, "%d\n", val); \
809}
810
811#define DECLARE_EVT_STORE(name, Cap_name) \
812static ssize_t \
813sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
814 const char *buf, size_t count) \
815{ \
816 struct scsi_device *sdev = to_scsi_device(dev); \
817 int val = simple_strtoul(buf, NULL, 0); \
818 if (val == 0) \
819 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
820 else if (val == 1) \
821 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
822 else \
823 return -EINVAL; \
824 return count; \
825}
826
827#define DECLARE_EVT(name, Cap_name) \
828 DECLARE_EVT_SHOW(name, Cap_name) \
829 DECLARE_EVT_STORE(name, Cap_name) \
830 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
831 sdev_store_evt_##name);
832#define REF_EVT(name) &dev_attr_evt_##name.attr
833
834DECLARE_EVT(media_change, MEDIA_CHANGE)
835DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
836DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
837DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
838DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
839DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
840
841static ssize_t
842sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
843 const char *buf, size_t count)
844{
845 int depth, retval;
846 struct scsi_device *sdev = to_scsi_device(dev);
847 struct scsi_host_template *sht = sdev->host->hostt;
848
849 if (!sht->change_queue_depth)
850 return -EINVAL;
851
852 depth = simple_strtoul(buf, NULL, 0);
853
854 if (depth < 1)
855 return -EINVAL;
856
857 retval = sht->change_queue_depth(sdev, depth,
858 SCSI_QDEPTH_DEFAULT);
859 if (retval < 0)
860 return retval;
861
862 sdev->max_queue_depth = sdev->queue_depth;
863
864 return count;
865}
866sdev_show_function(queue_depth, "%d\n");
867
868static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
869 sdev_store_queue_depth);
870
871static ssize_t
872sdev_show_queue_ramp_up_period(struct device *dev,
873 struct device_attribute *attr,
874 char *buf)
875{
876 struct scsi_device *sdev;
877 sdev = to_scsi_device(dev);
878 return snprintf(buf, 20, "%u\n",
879 jiffies_to_msecs(sdev->queue_ramp_up_period));
880}
881
882static ssize_t
883sdev_store_queue_ramp_up_period(struct device *dev,
884 struct device_attribute *attr,
885 const char *buf, size_t count)
886{
887 struct scsi_device *sdev = to_scsi_device(dev);
888 unsigned long period;
889
890 if (strict_strtoul(buf, 10, &period))
891 return -EINVAL;
892
893 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
894 return period;
895}
896
897static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
898 sdev_show_queue_ramp_up_period,
899 sdev_store_queue_ramp_up_period);
900
901static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
902 struct attribute *attr, int i)
903{
904 struct device *dev = container_of(kobj, struct device, kobj);
905 struct scsi_device *sdev = to_scsi_device(dev);
906
907
908 if (attr == &dev_attr_queue_depth.attr &&
909 !sdev->host->hostt->change_queue_depth)
910 return S_IRUGO;
911
912 if (attr == &dev_attr_queue_ramp_up_period.attr &&
913 !sdev->host->hostt->change_queue_depth)
914 return 0;
915
916 if (attr == &dev_attr_queue_type.attr &&
917 !sdev->host->hostt->change_queue_type)
918 return S_IRUGO;
919
920 return attr->mode;
921}
922
923/* Default template for device attributes. May NOT be modified */
924static struct attribute *scsi_sdev_attrs[] = {
925 &dev_attr_device_blocked.attr,
926 &dev_attr_type.attr,
927 &dev_attr_scsi_level.attr,
928 &dev_attr_device_busy.attr,
929 &dev_attr_vendor.attr,
930 &dev_attr_model.attr,
931 &dev_attr_rev.attr,
932 &dev_attr_rescan.attr,
933 &dev_attr_delete.attr,
934 &dev_attr_state.attr,
935 &dev_attr_timeout.attr,
936 &dev_attr_eh_timeout.attr,
937 &dev_attr_iocounterbits.attr,
938 &dev_attr_iorequest_cnt.attr,
939 &dev_attr_iodone_cnt.attr,
940 &dev_attr_ioerr_cnt.attr,
941 &dev_attr_modalias.attr,
942 &dev_attr_queue_depth.attr,
943 &dev_attr_queue_type.attr,
944 &dev_attr_queue_ramp_up_period.attr,
945 REF_EVT(media_change),
946 REF_EVT(inquiry_change_reported),
947 REF_EVT(capacity_change_reported),
948 REF_EVT(soft_threshold_reached),
949 REF_EVT(mode_parameter_change_reported),
950 REF_EVT(lun_change_reported),
951 NULL
952};
953
954static struct bin_attribute *scsi_sdev_bin_attrs[] = {
955 &dev_attr_vpd_pg83,
956 &dev_attr_vpd_pg80,
957 NULL
958};
959static struct attribute_group scsi_sdev_attr_group = {
960 .attrs = scsi_sdev_attrs,
961 .bin_attrs = scsi_sdev_bin_attrs,
962 .is_visible = scsi_sdev_attr_is_visible,
963};
964
965static const struct attribute_group *scsi_sdev_attr_groups[] = {
966 &scsi_sdev_attr_group,
967 NULL
968};
969
970static int scsi_target_add(struct scsi_target *starget)
971{
972 int error;
973
974 if (starget->state != STARGET_CREATED)
975 return 0;
976
977 error = device_add(&starget->dev);
978 if (error) {
979 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
980 return error;
981 }
982 transport_add_device(&starget->dev);
983 starget->state = STARGET_RUNNING;
984
985 pm_runtime_set_active(&starget->dev);
986 pm_runtime_enable(&starget->dev);
987 device_enable_async_suspend(&starget->dev);
988
989 return 0;
990}
991
992/**
993 * scsi_sysfs_add_sdev - add scsi device to sysfs
994 * @sdev: scsi_device to add
995 *
996 * Return value:
997 * 0 on Success / non-zero on Failure
998 **/
999int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1000{
1001 int error, i;
1002 struct request_queue *rq = sdev->request_queue;
1003 struct scsi_target *starget = sdev->sdev_target;
1004
1005 error = scsi_device_set_state(sdev, SDEV_RUNNING);
1006 if (error)
1007 return error;
1008
1009 error = scsi_target_add(starget);
1010 if (error)
1011 return error;
1012
1013 transport_configure_device(&starget->dev);
1014
1015 device_enable_async_suspend(&sdev->sdev_gendev);
1016 scsi_autopm_get_target(starget);
1017 pm_runtime_set_active(&sdev->sdev_gendev);
1018 pm_runtime_forbid(&sdev->sdev_gendev);
1019 pm_runtime_enable(&sdev->sdev_gendev);
1020 scsi_autopm_put_target(starget);
1021
1022 /* The following call will keep sdev active indefinitely, until
1023 * its driver does a corresponding scsi_autopm_pm_device(). Only
1024 * drivers supporting autosuspend will do this.
1025 */
1026 scsi_autopm_get_device(sdev);
1027
1028 error = device_add(&sdev->sdev_gendev);
1029 if (error) {
1030 sdev_printk(KERN_INFO, sdev,
1031 "failed to add device: %d\n", error);
1032 return error;
1033 }
1034 device_enable_async_suspend(&sdev->sdev_dev);
1035 error = device_add(&sdev->sdev_dev);
1036 if (error) {
1037 sdev_printk(KERN_INFO, sdev,
1038 "failed to add class device: %d\n", error);
1039 device_del(&sdev->sdev_gendev);
1040 return error;
1041 }
1042 transport_add_device(&sdev->sdev_gendev);
1043 sdev->is_visible = 1;
1044
1045 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1046
1047 if (error)
1048 /* we're treating error on bsg register as non-fatal,
1049 * so pretend nothing went wrong */
1050 sdev_printk(KERN_INFO, sdev,
1051 "Failed to register bsg queue, errno=%d\n", error);
1052
1053 /* add additional host specific attributes */
1054 if (sdev->host->hostt->sdev_attrs) {
1055 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1056 error = device_create_file(&sdev->sdev_gendev,
1057 sdev->host->hostt->sdev_attrs[i]);
1058 if (error)
1059 return error;
1060 }
1061 }
1062
1063 return error;
1064}
1065
1066void __scsi_remove_device(struct scsi_device *sdev)
1067{
1068 struct device *dev = &sdev->sdev_gendev;
1069
1070 if (sdev->is_visible) {
1071 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
1072 return;
1073
1074 bsg_unregister_queue(sdev->request_queue);
1075 device_unregister(&sdev->sdev_dev);
1076 transport_remove_device(dev);
1077 device_del(dev);
1078 } else
1079 put_device(&sdev->sdev_dev);
1080
1081 /*
1082 * Stop accepting new requests and wait until all queuecommand() and
1083 * scsi_run_queue() invocations have finished before tearing down the
1084 * device.
1085 */
1086 scsi_device_set_state(sdev, SDEV_DEL);
1087 blk_cleanup_queue(sdev->request_queue);
1088 cancel_work_sync(&sdev->requeue_work);
1089
1090 if (sdev->host->hostt->slave_destroy)
1091 sdev->host->hostt->slave_destroy(sdev);
1092 transport_destroy_device(dev);
1093
1094 /*
1095 * Paired with the kref_get() in scsi_sysfs_initialize(). We have
1096 * remoed sysfs visibility from the device, so make the target
1097 * invisible if this was the last device underneath it.
1098 */
1099 scsi_target_reap(scsi_target(sdev));
1100
1101 put_device(dev);
1102}
1103
1104/**
1105 * scsi_remove_device - unregister a device from the scsi bus
1106 * @sdev: scsi_device to unregister
1107 **/
1108void scsi_remove_device(struct scsi_device *sdev)
1109{
1110 struct Scsi_Host *shost = sdev->host;
1111
1112 mutex_lock(&shost->scan_mutex);
1113 __scsi_remove_device(sdev);
1114 mutex_unlock(&shost->scan_mutex);
1115}
1116EXPORT_SYMBOL(scsi_remove_device);
1117
1118static void __scsi_remove_target(struct scsi_target *starget)
1119{
1120 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1121 unsigned long flags;
1122 struct scsi_device *sdev;
1123
1124 spin_lock_irqsave(shost->host_lock, flags);
1125 restart:
1126 list_for_each_entry(sdev, &shost->__devices, siblings) {
1127 if (sdev->channel != starget->channel ||
1128 sdev->id != starget->id ||
1129 scsi_device_get(sdev))
1130 continue;
1131 spin_unlock_irqrestore(shost->host_lock, flags);
1132 scsi_remove_device(sdev);
1133 scsi_device_put(sdev);
1134 spin_lock_irqsave(shost->host_lock, flags);
1135 goto restart;
1136 }
1137 spin_unlock_irqrestore(shost->host_lock, flags);
1138}
1139
1140/**
1141 * scsi_remove_target - try to remove a target and all its devices
1142 * @dev: generic starget or parent of generic stargets to be removed
1143 *
1144 * Note: This is slightly racy. It is possible that if the user
1145 * requests the addition of another device then the target won't be
1146 * removed.
1147 */
1148void scsi_remove_target(struct device *dev)
1149{
1150 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1151 struct scsi_target *starget, *last = NULL;
1152 unsigned long flags;
1153
1154 /* remove targets being careful to lookup next entry before
1155 * deleting the last
1156 */
1157 spin_lock_irqsave(shost->host_lock, flags);
1158 list_for_each_entry(starget, &shost->__targets, siblings) {
1159 if (starget->state == STARGET_DEL)
1160 continue;
1161 if (starget->dev.parent == dev || &starget->dev == dev) {
1162 /* assuming new targets arrive at the end */
1163 kref_get(&starget->reap_ref);
1164 spin_unlock_irqrestore(shost->host_lock, flags);
1165 if (last)
1166 scsi_target_reap(last);
1167 last = starget;
1168 __scsi_remove_target(starget);
1169 spin_lock_irqsave(shost->host_lock, flags);
1170 }
1171 }
1172 spin_unlock_irqrestore(shost->host_lock, flags);
1173
1174 if (last)
1175 scsi_target_reap(last);
1176}
1177EXPORT_SYMBOL(scsi_remove_target);
1178
1179int scsi_register_driver(struct device_driver *drv)
1180{
1181 drv->bus = &scsi_bus_type;
1182
1183 return driver_register(drv);
1184}
1185EXPORT_SYMBOL(scsi_register_driver);
1186
1187int scsi_register_interface(struct class_interface *intf)
1188{
1189 intf->class = &sdev_class;
1190
1191 return class_interface_register(intf);
1192}
1193EXPORT_SYMBOL(scsi_register_interface);
1194
1195/**
1196 * scsi_sysfs_add_host - add scsi host to subsystem
1197 * @shost: scsi host struct to add to subsystem
1198 **/
1199int scsi_sysfs_add_host(struct Scsi_Host *shost)
1200{
1201 int error, i;
1202
1203 /* add host specific attributes */
1204 if (shost->hostt->shost_attrs) {
1205 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1206 error = device_create_file(&shost->shost_dev,
1207 shost->hostt->shost_attrs[i]);
1208 if (error)
1209 return error;
1210 }
1211 }
1212
1213 transport_register_device(&shost->shost_gendev);
1214 transport_configure_device(&shost->shost_gendev);
1215 return 0;
1216}
1217
1218static struct device_type scsi_dev_type = {
1219 .name = "scsi_device",
1220 .release = scsi_device_dev_release,
1221 .groups = scsi_sdev_attr_groups,
1222};
1223
1224void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1225{
1226 unsigned long flags;
1227 struct Scsi_Host *shost = sdev->host;
1228 struct scsi_target *starget = sdev->sdev_target;
1229
1230 device_initialize(&sdev->sdev_gendev);
1231 sdev->sdev_gendev.bus = &scsi_bus_type;
1232 sdev->sdev_gendev.type = &scsi_dev_type;
1233 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1234 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1235
1236 device_initialize(&sdev->sdev_dev);
1237 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1238 sdev->sdev_dev.class = &sdev_class;
1239 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1240 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1241 sdev->scsi_level = starget->scsi_level;
1242 transport_setup_device(&sdev->sdev_gendev);
1243 spin_lock_irqsave(shost->host_lock, flags);
1244 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1245 list_add_tail(&sdev->siblings, &shost->__devices);
1246 spin_unlock_irqrestore(shost->host_lock, flags);
1247 /*
1248 * device can now only be removed via __scsi_remove_device() so hold
1249 * the target. Target will be held in CREATED state until something
1250 * beneath it becomes visible (in which case it moves to RUNNING)
1251 */
1252 kref_get(&starget->reap_ref);
1253}
1254
1255int scsi_is_sdev_device(const struct device *dev)
1256{
1257 return dev->type == &scsi_dev_type;
1258}
1259EXPORT_SYMBOL(scsi_is_sdev_device);
1260
1261/* A blank transport template that is used in drivers that don't
1262 * yet implement Transport Attributes */
1263struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
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
24#include "scsi_priv.h"
25#include "scsi_logging.h"
26
27static struct device_type scsi_dev_type;
28
29static const struct {
30 enum scsi_device_state value;
31 char *name;
32} sdev_states[] = {
33 { SDEV_CREATED, "created" },
34 { SDEV_RUNNING, "running" },
35 { SDEV_CANCEL, "cancel" },
36 { SDEV_DEL, "deleted" },
37 { SDEV_QUIESCE, "quiesce" },
38 { SDEV_OFFLINE, "offline" },
39 { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
40 { SDEV_BLOCK, "blocked" },
41 { SDEV_CREATED_BLOCK, "created-blocked" },
42};
43
44const char *scsi_device_state_name(enum scsi_device_state state)
45{
46 int i;
47 char *name = NULL;
48
49 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
50 if (sdev_states[i].value == state) {
51 name = sdev_states[i].name;
52 break;
53 }
54 }
55 return name;
56}
57
58static const struct {
59 enum scsi_host_state value;
60 char *name;
61} shost_states[] = {
62 { SHOST_CREATED, "created" },
63 { SHOST_RUNNING, "running" },
64 { SHOST_CANCEL, "cancel" },
65 { SHOST_DEL, "deleted" },
66 { SHOST_RECOVERY, "recovery" },
67 { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
68 { SHOST_DEL_RECOVERY, "deleted/recovery", },
69};
70const char *scsi_host_state_name(enum scsi_host_state state)
71{
72 int i;
73 char *name = NULL;
74
75 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
76 if (shost_states[i].value == state) {
77 name = shost_states[i].name;
78 break;
79 }
80 }
81 return name;
82}
83
84#ifdef CONFIG_SCSI_DH
85static const struct {
86 unsigned char value;
87 char *name;
88} sdev_access_states[] = {
89 { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
90 { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
91 { SCSI_ACCESS_STATE_STANDBY, "standby" },
92 { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
93 { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
94 { SCSI_ACCESS_STATE_OFFLINE, "offline" },
95 { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
96};
97
98static const char *scsi_access_state_name(unsigned char state)
99{
100 int i;
101 char *name = NULL;
102
103 for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
104 if (sdev_access_states[i].value == state) {
105 name = sdev_access_states[i].name;
106 break;
107 }
108 }
109 return name;
110}
111#endif
112
113static int check_set(unsigned long long *val, char *src)
114{
115 char *last;
116
117 if (strncmp(src, "-", 20) == 0) {
118 *val = SCAN_WILD_CARD;
119 } else {
120 /*
121 * Doesn't check for int overflow
122 */
123 *val = simple_strtoull(src, &last, 0);
124 if (*last != '\0')
125 return 1;
126 }
127 return 0;
128}
129
130static int scsi_scan(struct Scsi_Host *shost, const char *str)
131{
132 char s1[15], s2[15], s3[17], junk;
133 unsigned long long channel, id, lun;
134 int res;
135
136 res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
137 if (res != 3)
138 return -EINVAL;
139 if (check_set(&channel, s1))
140 return -EINVAL;
141 if (check_set(&id, s2))
142 return -EINVAL;
143 if (check_set(&lun, s3))
144 return -EINVAL;
145 if (shost->transportt->user_scan)
146 res = shost->transportt->user_scan(shost, channel, id, lun);
147 else
148 res = scsi_scan_host_selected(shost, channel, id, lun,
149 SCSI_SCAN_MANUAL);
150 return res;
151}
152
153/*
154 * shost_show_function: macro to create an attr function that can be used to
155 * show a non-bit field.
156 */
157#define shost_show_function(name, field, format_string) \
158static ssize_t \
159show_##name (struct device *dev, struct device_attribute *attr, \
160 char *buf) \
161{ \
162 struct Scsi_Host *shost = class_to_shost(dev); \
163 return snprintf (buf, 20, format_string, shost->field); \
164}
165
166/*
167 * shost_rd_attr: macro to create a function and attribute variable for a
168 * read only field.
169 */
170#define shost_rd_attr2(name, field, format_string) \
171 shost_show_function(name, field, format_string) \
172static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
173
174#define shost_rd_attr(field, format_string) \
175shost_rd_attr2(field, field, format_string)
176
177/*
178 * Create the actual show/store functions and data structures.
179 */
180
181static ssize_t
182store_scan(struct device *dev, struct device_attribute *attr,
183 const char *buf, size_t count)
184{
185 struct Scsi_Host *shost = class_to_shost(dev);
186 int res;
187
188 res = scsi_scan(shost, buf);
189 if (res == 0)
190 res = count;
191 return res;
192};
193static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
194
195static ssize_t
196store_shost_state(struct device *dev, struct device_attribute *attr,
197 const char *buf, size_t count)
198{
199 int i;
200 struct Scsi_Host *shost = class_to_shost(dev);
201 enum scsi_host_state state = 0;
202
203 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
204 const int len = strlen(shost_states[i].name);
205 if (strncmp(shost_states[i].name, buf, len) == 0 &&
206 buf[len] == '\n') {
207 state = shost_states[i].value;
208 break;
209 }
210 }
211 if (!state)
212 return -EINVAL;
213
214 if (scsi_host_set_state(shost, state))
215 return -EINVAL;
216 return count;
217}
218
219static ssize_t
220show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
221{
222 struct Scsi_Host *shost = class_to_shost(dev);
223 const char *name = scsi_host_state_name(shost->shost_state);
224
225 if (!name)
226 return -EINVAL;
227
228 return snprintf(buf, 20, "%s\n", name);
229}
230
231/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
232static struct device_attribute dev_attr_hstate =
233 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
234
235static ssize_t
236show_shost_mode(unsigned int mode, char *buf)
237{
238 ssize_t len = 0;
239
240 if (mode & MODE_INITIATOR)
241 len = sprintf(buf, "%s", "Initiator");
242
243 if (mode & MODE_TARGET)
244 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
245
246 len += sprintf(buf + len, "\n");
247
248 return len;
249}
250
251static ssize_t
252show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
253 char *buf)
254{
255 struct Scsi_Host *shost = class_to_shost(dev);
256 unsigned int supported_mode = shost->hostt->supported_mode;
257
258 if (supported_mode == MODE_UNKNOWN)
259 /* by default this should be initiator */
260 supported_mode = MODE_INITIATOR;
261
262 return show_shost_mode(supported_mode, buf);
263}
264
265static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
266
267static ssize_t
268show_shost_active_mode(struct device *dev,
269 struct device_attribute *attr, char *buf)
270{
271 struct Scsi_Host *shost = class_to_shost(dev);
272
273 if (shost->active_mode == MODE_UNKNOWN)
274 return snprintf(buf, 20, "unknown\n");
275 else
276 return show_shost_mode(shost->active_mode, buf);
277}
278
279static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
280
281static int check_reset_type(const char *str)
282{
283 if (sysfs_streq(str, "adapter"))
284 return SCSI_ADAPTER_RESET;
285 else if (sysfs_streq(str, "firmware"))
286 return SCSI_FIRMWARE_RESET;
287 else
288 return 0;
289}
290
291static ssize_t
292store_host_reset(struct device *dev, struct device_attribute *attr,
293 const char *buf, size_t count)
294{
295 struct Scsi_Host *shost = class_to_shost(dev);
296 struct scsi_host_template *sht = shost->hostt;
297 int ret = -EINVAL;
298 int type;
299
300 type = check_reset_type(buf);
301 if (!type)
302 goto exit_store_host_reset;
303
304 if (sht->host_reset)
305 ret = sht->host_reset(shost, type);
306
307exit_store_host_reset:
308 if (ret == 0)
309 ret = count;
310 return ret;
311}
312
313static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
314
315static ssize_t
316show_shost_eh_deadline(struct device *dev,
317 struct device_attribute *attr, char *buf)
318{
319 struct Scsi_Host *shost = class_to_shost(dev);
320
321 if (shost->eh_deadline == -1)
322 return snprintf(buf, strlen("off") + 2, "off\n");
323 return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
324}
325
326static ssize_t
327store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
328 const char *buf, size_t count)
329{
330 struct Scsi_Host *shost = class_to_shost(dev);
331 int ret = -EINVAL;
332 unsigned long deadline, flags;
333
334 if (shost->transportt &&
335 (shost->transportt->eh_strategy_handler ||
336 !shost->hostt->eh_host_reset_handler))
337 return ret;
338
339 if (!strncmp(buf, "off", strlen("off")))
340 deadline = -1;
341 else {
342 ret = kstrtoul(buf, 10, &deadline);
343 if (ret)
344 return ret;
345 if (deadline * HZ > UINT_MAX)
346 return -EINVAL;
347 }
348
349 spin_lock_irqsave(shost->host_lock, flags);
350 if (scsi_host_in_recovery(shost))
351 ret = -EBUSY;
352 else {
353 if (deadline == -1)
354 shost->eh_deadline = -1;
355 else
356 shost->eh_deadline = deadline * HZ;
357
358 ret = count;
359 }
360 spin_unlock_irqrestore(shost->host_lock, flags);
361
362 return ret;
363}
364
365static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
366
367shost_rd_attr(use_blk_mq, "%d\n");
368shost_rd_attr(unique_id, "%u\n");
369shost_rd_attr(cmd_per_lun, "%hd\n");
370shost_rd_attr(can_queue, "%hd\n");
371shost_rd_attr(sg_tablesize, "%hu\n");
372shost_rd_attr(sg_prot_tablesize, "%hu\n");
373shost_rd_attr(unchecked_isa_dma, "%d\n");
374shost_rd_attr(prot_capabilities, "%u\n");
375shost_rd_attr(prot_guard_type, "%hd\n");
376shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
377
378static ssize_t
379show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
380{
381 struct Scsi_Host *shost = class_to_shost(dev);
382 return snprintf(buf, 20, "%d\n", atomic_read(&shost->host_busy));
383}
384static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
385
386static struct attribute *scsi_sysfs_shost_attrs[] = {
387 &dev_attr_use_blk_mq.attr,
388 &dev_attr_unique_id.attr,
389 &dev_attr_host_busy.attr,
390 &dev_attr_cmd_per_lun.attr,
391 &dev_attr_can_queue.attr,
392 &dev_attr_sg_tablesize.attr,
393 &dev_attr_sg_prot_tablesize.attr,
394 &dev_attr_unchecked_isa_dma.attr,
395 &dev_attr_proc_name.attr,
396 &dev_attr_scan.attr,
397 &dev_attr_hstate.attr,
398 &dev_attr_supported_mode.attr,
399 &dev_attr_active_mode.attr,
400 &dev_attr_prot_capabilities.attr,
401 &dev_attr_prot_guard_type.attr,
402 &dev_attr_host_reset.attr,
403 &dev_attr_eh_deadline.attr,
404 NULL
405};
406
407static struct attribute_group scsi_shost_attr_group = {
408 .attrs = scsi_sysfs_shost_attrs,
409};
410
411const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
412 &scsi_shost_attr_group,
413 NULL
414};
415
416static void scsi_device_cls_release(struct device *class_dev)
417{
418 struct scsi_device *sdev;
419
420 sdev = class_to_sdev(class_dev);
421 put_device(&sdev->sdev_gendev);
422}
423
424static void scsi_device_dev_release_usercontext(struct work_struct *work)
425{
426 struct scsi_device *sdev;
427 struct device *parent;
428 struct list_head *this, *tmp;
429 unsigned long flags;
430
431 sdev = container_of(work, struct scsi_device, ew.work);
432
433 scsi_dh_release_device(sdev);
434
435 parent = sdev->sdev_gendev.parent;
436
437 spin_lock_irqsave(sdev->host->host_lock, flags);
438 list_del(&sdev->siblings);
439 list_del(&sdev->same_target_siblings);
440 list_del(&sdev->starved_entry);
441 spin_unlock_irqrestore(sdev->host->host_lock, flags);
442
443 cancel_work_sync(&sdev->event_work);
444
445 list_for_each_safe(this, tmp, &sdev->event_list) {
446 struct scsi_event *evt;
447
448 evt = list_entry(this, struct scsi_event, node);
449 list_del(&evt->node);
450 kfree(evt);
451 }
452
453 blk_put_queue(sdev->request_queue);
454 /* NULL queue means the device can't be used */
455 sdev->request_queue = NULL;
456
457 kfree(sdev->vpd_pg83);
458 kfree(sdev->vpd_pg80);
459 kfree(sdev->inquiry);
460 kfree(sdev);
461
462 if (parent)
463 put_device(parent);
464}
465
466static void scsi_device_dev_release(struct device *dev)
467{
468 struct scsi_device *sdp = to_scsi_device(dev);
469 execute_in_process_context(scsi_device_dev_release_usercontext,
470 &sdp->ew);
471}
472
473static struct class sdev_class = {
474 .name = "scsi_device",
475 .dev_release = scsi_device_cls_release,
476};
477
478/* all probing is done in the individual ->probe routines */
479static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
480{
481 struct scsi_device *sdp;
482
483 if (dev->type != &scsi_dev_type)
484 return 0;
485
486 sdp = to_scsi_device(dev);
487 if (sdp->no_uld_attach)
488 return 0;
489 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
490}
491
492static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
493{
494 struct scsi_device *sdev;
495
496 if (dev->type != &scsi_dev_type)
497 return 0;
498
499 sdev = to_scsi_device(dev);
500
501 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
502 return 0;
503}
504
505struct bus_type scsi_bus_type = {
506 .name = "scsi",
507 .match = scsi_bus_match,
508 .uevent = scsi_bus_uevent,
509#ifdef CONFIG_PM
510 .pm = &scsi_bus_pm_ops,
511#endif
512};
513EXPORT_SYMBOL_GPL(scsi_bus_type);
514
515int scsi_sysfs_register(void)
516{
517 int error;
518
519 error = bus_register(&scsi_bus_type);
520 if (!error) {
521 error = class_register(&sdev_class);
522 if (error)
523 bus_unregister(&scsi_bus_type);
524 }
525
526 return error;
527}
528
529void scsi_sysfs_unregister(void)
530{
531 class_unregister(&sdev_class);
532 bus_unregister(&scsi_bus_type);
533}
534
535/*
536 * sdev_show_function: macro to create an attr function that can be used to
537 * show a non-bit field.
538 */
539#define sdev_show_function(field, format_string) \
540static ssize_t \
541sdev_show_##field (struct device *dev, struct device_attribute *attr, \
542 char *buf) \
543{ \
544 struct scsi_device *sdev; \
545 sdev = to_scsi_device(dev); \
546 return snprintf (buf, 20, format_string, sdev->field); \
547} \
548
549/*
550 * sdev_rd_attr: macro to create a function and attribute variable for a
551 * read only field.
552 */
553#define sdev_rd_attr(field, format_string) \
554 sdev_show_function(field, format_string) \
555static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
556
557
558/*
559 * sdev_rw_attr: create a function and attribute variable for a
560 * read/write field.
561 */
562#define sdev_rw_attr(field, format_string) \
563 sdev_show_function(field, format_string) \
564 \
565static ssize_t \
566sdev_store_##field (struct device *dev, struct device_attribute *attr, \
567 const char *buf, size_t count) \
568{ \
569 struct scsi_device *sdev; \
570 sdev = to_scsi_device(dev); \
571 sscanf (buf, format_string, &sdev->field); \
572 return count; \
573} \
574static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
575
576/* Currently we don't export bit fields, but we might in future,
577 * so leave this code in */
578#if 0
579/*
580 * sdev_rd_attr: create a function and attribute variable for a
581 * read/write bit field.
582 */
583#define sdev_rw_attr_bit(field) \
584 sdev_show_function(field, "%d\n") \
585 \
586static ssize_t \
587sdev_store_##field (struct device *dev, struct device_attribute *attr, \
588 const char *buf, size_t count) \
589{ \
590 int ret; \
591 struct scsi_device *sdev; \
592 ret = scsi_sdev_check_buf_bit(buf); \
593 if (ret >= 0) { \
594 sdev = to_scsi_device(dev); \
595 sdev->field = ret; \
596 ret = count; \
597 } \
598 return ret; \
599} \
600static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
601
602/*
603 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
604 * else return -EINVAL.
605 */
606static int scsi_sdev_check_buf_bit(const char *buf)
607{
608 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
609 if (buf[0] == '1')
610 return 1;
611 else if (buf[0] == '0')
612 return 0;
613 else
614 return -EINVAL;
615 } else
616 return -EINVAL;
617}
618#endif
619/*
620 * Create the actual show/store functions and data structures.
621 */
622sdev_rd_attr (type, "%d\n");
623sdev_rd_attr (scsi_level, "%d\n");
624sdev_rd_attr (vendor, "%.8s\n");
625sdev_rd_attr (model, "%.16s\n");
626sdev_rd_attr (rev, "%.4s\n");
627
628static ssize_t
629sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
630 char *buf)
631{
632 struct scsi_device *sdev = to_scsi_device(dev);
633 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
634}
635static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
636
637static ssize_t
638sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
639 char *buf)
640{
641 struct scsi_device *sdev = to_scsi_device(dev);
642 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
643}
644static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
645
646/*
647 * TODO: can we make these symlinks to the block layer ones?
648 */
649static ssize_t
650sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
651{
652 struct scsi_device *sdev;
653 sdev = to_scsi_device(dev);
654 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
655}
656
657static ssize_t
658sdev_store_timeout (struct device *dev, struct device_attribute *attr,
659 const char *buf, size_t count)
660{
661 struct scsi_device *sdev;
662 int timeout;
663 sdev = to_scsi_device(dev);
664 sscanf (buf, "%d\n", &timeout);
665 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
666 return count;
667}
668static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
669
670static ssize_t
671sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
672{
673 struct scsi_device *sdev;
674 sdev = to_scsi_device(dev);
675 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
676}
677
678static ssize_t
679sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
680 const char *buf, size_t count)
681{
682 struct scsi_device *sdev;
683 unsigned int eh_timeout;
684 int err;
685
686 if (!capable(CAP_SYS_ADMIN))
687 return -EACCES;
688
689 sdev = to_scsi_device(dev);
690 err = kstrtouint(buf, 10, &eh_timeout);
691 if (err)
692 return err;
693 sdev->eh_timeout = eh_timeout * HZ;
694
695 return count;
696}
697static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
698
699static ssize_t
700store_rescan_field (struct device *dev, struct device_attribute *attr,
701 const char *buf, size_t count)
702{
703 scsi_rescan_device(dev);
704 return count;
705}
706static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
707
708static ssize_t
709sdev_store_delete(struct device *dev, struct device_attribute *attr,
710 const char *buf, size_t count)
711{
712 if (device_remove_file_self(dev, attr))
713 scsi_remove_device(to_scsi_device(dev));
714 return count;
715};
716static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
717
718static ssize_t
719store_state_field(struct device *dev, struct device_attribute *attr,
720 const char *buf, size_t count)
721{
722 int i;
723 struct scsi_device *sdev = to_scsi_device(dev);
724 enum scsi_device_state state = 0;
725
726 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
727 const int len = strlen(sdev_states[i].name);
728 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
729 buf[len] == '\n') {
730 state = sdev_states[i].value;
731 break;
732 }
733 }
734 if (!state)
735 return -EINVAL;
736
737 if (scsi_device_set_state(sdev, state))
738 return -EINVAL;
739 return count;
740}
741
742static ssize_t
743show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
744{
745 struct scsi_device *sdev = to_scsi_device(dev);
746 const char *name = scsi_device_state_name(sdev->sdev_state);
747
748 if (!name)
749 return -EINVAL;
750
751 return snprintf(buf, 20, "%s\n", name);
752}
753
754static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
755
756static ssize_t
757show_queue_type_field(struct device *dev, struct device_attribute *attr,
758 char *buf)
759{
760 struct scsi_device *sdev = to_scsi_device(dev);
761 const char *name = "none";
762
763 if (sdev->simple_tags)
764 name = "simple";
765
766 return snprintf(buf, 20, "%s\n", name);
767}
768
769static ssize_t
770store_queue_type_field(struct device *dev, struct device_attribute *attr,
771 const char *buf, size_t count)
772{
773 struct scsi_device *sdev = to_scsi_device(dev);
774
775 if (!sdev->tagged_supported)
776 return -EINVAL;
777
778 sdev_printk(KERN_INFO, sdev,
779 "ignoring write to deprecated queue_type attribute");
780 return count;
781}
782
783static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
784 store_queue_type_field);
785
786#define sdev_vpd_pg_attr(_page) \
787static ssize_t \
788show_vpd_##_page(struct file *filp, struct kobject *kobj, \
789 struct bin_attribute *bin_attr, \
790 char *buf, loff_t off, size_t count) \
791{ \
792 struct device *dev = container_of(kobj, struct device, kobj); \
793 struct scsi_device *sdev = to_scsi_device(dev); \
794 int ret; \
795 if (!sdev->vpd_##_page) \
796 return -EINVAL; \
797 rcu_read_lock(); \
798 ret = memory_read_from_buffer(buf, count, &off, \
799 rcu_dereference(sdev->vpd_##_page), \
800 sdev->vpd_##_page##_len); \
801 rcu_read_unlock(); \
802 return ret; \
803} \
804static struct bin_attribute dev_attr_vpd_##_page = { \
805 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
806 .size = 0, \
807 .read = show_vpd_##_page, \
808};
809
810sdev_vpd_pg_attr(pg83);
811sdev_vpd_pg_attr(pg80);
812
813static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
814 struct bin_attribute *bin_attr,
815 char *buf, loff_t off, size_t count)
816{
817 struct device *dev = container_of(kobj, struct device, kobj);
818 struct scsi_device *sdev = to_scsi_device(dev);
819
820 if (!sdev->inquiry)
821 return -EINVAL;
822
823 return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
824 sdev->inquiry_len);
825}
826
827static struct bin_attribute dev_attr_inquiry = {
828 .attr = {
829 .name = "inquiry",
830 .mode = S_IRUGO,
831 },
832 .size = 0,
833 .read = show_inquiry,
834};
835
836static ssize_t
837show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
838 char *buf)
839{
840 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
841}
842
843static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
844
845#define show_sdev_iostat(field) \
846static ssize_t \
847show_iostat_##field(struct device *dev, struct device_attribute *attr, \
848 char *buf) \
849{ \
850 struct scsi_device *sdev = to_scsi_device(dev); \
851 unsigned long long count = atomic_read(&sdev->field); \
852 return snprintf(buf, 20, "0x%llx\n", count); \
853} \
854static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
855
856show_sdev_iostat(iorequest_cnt);
857show_sdev_iostat(iodone_cnt);
858show_sdev_iostat(ioerr_cnt);
859
860static ssize_t
861sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
862{
863 struct scsi_device *sdev;
864 sdev = to_scsi_device(dev);
865 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
866}
867static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
868
869#define DECLARE_EVT_SHOW(name, Cap_name) \
870static ssize_t \
871sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
872 char *buf) \
873{ \
874 struct scsi_device *sdev = to_scsi_device(dev); \
875 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
876 return snprintf(buf, 20, "%d\n", val); \
877}
878
879#define DECLARE_EVT_STORE(name, Cap_name) \
880static ssize_t \
881sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
882 const char *buf, size_t count) \
883{ \
884 struct scsi_device *sdev = to_scsi_device(dev); \
885 int val = simple_strtoul(buf, NULL, 0); \
886 if (val == 0) \
887 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
888 else if (val == 1) \
889 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
890 else \
891 return -EINVAL; \
892 return count; \
893}
894
895#define DECLARE_EVT(name, Cap_name) \
896 DECLARE_EVT_SHOW(name, Cap_name) \
897 DECLARE_EVT_STORE(name, Cap_name) \
898 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
899 sdev_store_evt_##name);
900#define REF_EVT(name) &dev_attr_evt_##name.attr
901
902DECLARE_EVT(media_change, MEDIA_CHANGE)
903DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
904DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
905DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
906DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
907DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
908
909static ssize_t
910sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
911 const char *buf, size_t count)
912{
913 int depth, retval;
914 struct scsi_device *sdev = to_scsi_device(dev);
915 struct scsi_host_template *sht = sdev->host->hostt;
916
917 if (!sht->change_queue_depth)
918 return -EINVAL;
919
920 depth = simple_strtoul(buf, NULL, 0);
921
922 if (depth < 1 || depth > sdev->host->can_queue)
923 return -EINVAL;
924
925 retval = sht->change_queue_depth(sdev, depth);
926 if (retval < 0)
927 return retval;
928
929 sdev->max_queue_depth = sdev->queue_depth;
930
931 return count;
932}
933sdev_show_function(queue_depth, "%d\n");
934
935static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
936 sdev_store_queue_depth);
937
938static ssize_t
939sdev_show_wwid(struct device *dev, struct device_attribute *attr,
940 char *buf)
941{
942 struct scsi_device *sdev = to_scsi_device(dev);
943 ssize_t count;
944
945 count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
946 if (count > 0) {
947 buf[count] = '\n';
948 count++;
949 }
950 return count;
951}
952static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
953
954#ifdef CONFIG_SCSI_DH
955static ssize_t
956sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
957 char *buf)
958{
959 struct scsi_device *sdev = to_scsi_device(dev);
960
961 if (!sdev->handler)
962 return snprintf(buf, 20, "detached\n");
963
964 return snprintf(buf, 20, "%s\n", sdev->handler->name);
965}
966
967static ssize_t
968sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
969 const char *buf, size_t count)
970{
971 struct scsi_device *sdev = to_scsi_device(dev);
972 int err = -EINVAL;
973
974 if (sdev->sdev_state == SDEV_CANCEL ||
975 sdev->sdev_state == SDEV_DEL)
976 return -ENODEV;
977
978 if (!sdev->handler) {
979 /*
980 * Attach to a device handler
981 */
982 err = scsi_dh_attach(sdev->request_queue, buf);
983 } else if (!strncmp(buf, "activate", 8)) {
984 /*
985 * Activate a device handler
986 */
987 if (sdev->handler->activate)
988 err = sdev->handler->activate(sdev, NULL, NULL);
989 else
990 err = 0;
991 } else if (!strncmp(buf, "detach", 6)) {
992 /*
993 * Detach from a device handler
994 */
995 sdev_printk(KERN_WARNING, sdev,
996 "can't detach handler %s.\n",
997 sdev->handler->name);
998 err = -EINVAL;
999 }
1000
1001 return err < 0 ? err : count;
1002}
1003
1004static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1005 sdev_store_dh_state);
1006
1007static ssize_t
1008sdev_show_access_state(struct device *dev,
1009 struct device_attribute *attr,
1010 char *buf)
1011{
1012 struct scsi_device *sdev = to_scsi_device(dev);
1013 unsigned char access_state;
1014 const char *access_state_name;
1015
1016 if (!sdev->handler)
1017 return -EINVAL;
1018
1019 access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1020 access_state_name = scsi_access_state_name(access_state);
1021
1022 return sprintf(buf, "%s\n",
1023 access_state_name ? access_state_name : "unknown");
1024}
1025static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1026
1027static ssize_t
1028sdev_show_preferred_path(struct device *dev,
1029 struct device_attribute *attr,
1030 char *buf)
1031{
1032 struct scsi_device *sdev = to_scsi_device(dev);
1033
1034 if (!sdev->handler)
1035 return -EINVAL;
1036
1037 if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1038 return sprintf(buf, "1\n");
1039 else
1040 return sprintf(buf, "0\n");
1041}
1042static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1043#endif
1044
1045static ssize_t
1046sdev_show_queue_ramp_up_period(struct device *dev,
1047 struct device_attribute *attr,
1048 char *buf)
1049{
1050 struct scsi_device *sdev;
1051 sdev = to_scsi_device(dev);
1052 return snprintf(buf, 20, "%u\n",
1053 jiffies_to_msecs(sdev->queue_ramp_up_period));
1054}
1055
1056static ssize_t
1057sdev_store_queue_ramp_up_period(struct device *dev,
1058 struct device_attribute *attr,
1059 const char *buf, size_t count)
1060{
1061 struct scsi_device *sdev = to_scsi_device(dev);
1062 unsigned int period;
1063
1064 if (kstrtouint(buf, 10, &period))
1065 return -EINVAL;
1066
1067 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1068 return count;
1069}
1070
1071static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1072 sdev_show_queue_ramp_up_period,
1073 sdev_store_queue_ramp_up_period);
1074
1075static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1076 struct attribute *attr, int i)
1077{
1078 struct device *dev = container_of(kobj, struct device, kobj);
1079 struct scsi_device *sdev = to_scsi_device(dev);
1080
1081
1082 if (attr == &dev_attr_queue_depth.attr &&
1083 !sdev->host->hostt->change_queue_depth)
1084 return S_IRUGO;
1085
1086 if (attr == &dev_attr_queue_ramp_up_period.attr &&
1087 !sdev->host->hostt->change_queue_depth)
1088 return 0;
1089
1090#ifdef CONFIG_SCSI_DH
1091 if (attr == &dev_attr_access_state.attr &&
1092 !sdev->handler)
1093 return 0;
1094 if (attr == &dev_attr_preferred_path.attr &&
1095 !sdev->handler)
1096 return 0;
1097#endif
1098 return attr->mode;
1099}
1100
1101static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1102 struct bin_attribute *attr, int i)
1103{
1104 struct device *dev = container_of(kobj, struct device, kobj);
1105 struct scsi_device *sdev = to_scsi_device(dev);
1106
1107
1108 if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1109 return 0;
1110
1111 if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1112 return 0;
1113
1114 return S_IRUGO;
1115}
1116
1117/* Default template for device attributes. May NOT be modified */
1118static struct attribute *scsi_sdev_attrs[] = {
1119 &dev_attr_device_blocked.attr,
1120 &dev_attr_type.attr,
1121 &dev_attr_scsi_level.attr,
1122 &dev_attr_device_busy.attr,
1123 &dev_attr_vendor.attr,
1124 &dev_attr_model.attr,
1125 &dev_attr_rev.attr,
1126 &dev_attr_rescan.attr,
1127 &dev_attr_delete.attr,
1128 &dev_attr_state.attr,
1129 &dev_attr_timeout.attr,
1130 &dev_attr_eh_timeout.attr,
1131 &dev_attr_iocounterbits.attr,
1132 &dev_attr_iorequest_cnt.attr,
1133 &dev_attr_iodone_cnt.attr,
1134 &dev_attr_ioerr_cnt.attr,
1135 &dev_attr_modalias.attr,
1136 &dev_attr_queue_depth.attr,
1137 &dev_attr_queue_type.attr,
1138 &dev_attr_wwid.attr,
1139#ifdef CONFIG_SCSI_DH
1140 &dev_attr_dh_state.attr,
1141 &dev_attr_access_state.attr,
1142 &dev_attr_preferred_path.attr,
1143#endif
1144 &dev_attr_queue_ramp_up_period.attr,
1145 REF_EVT(media_change),
1146 REF_EVT(inquiry_change_reported),
1147 REF_EVT(capacity_change_reported),
1148 REF_EVT(soft_threshold_reached),
1149 REF_EVT(mode_parameter_change_reported),
1150 REF_EVT(lun_change_reported),
1151 NULL
1152};
1153
1154static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1155 &dev_attr_vpd_pg83,
1156 &dev_attr_vpd_pg80,
1157 &dev_attr_inquiry,
1158 NULL
1159};
1160static struct attribute_group scsi_sdev_attr_group = {
1161 .attrs = scsi_sdev_attrs,
1162 .bin_attrs = scsi_sdev_bin_attrs,
1163 .is_visible = scsi_sdev_attr_is_visible,
1164 .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1165};
1166
1167static const struct attribute_group *scsi_sdev_attr_groups[] = {
1168 &scsi_sdev_attr_group,
1169 NULL
1170};
1171
1172static int scsi_target_add(struct scsi_target *starget)
1173{
1174 int error;
1175
1176 if (starget->state != STARGET_CREATED)
1177 return 0;
1178
1179 error = device_add(&starget->dev);
1180 if (error) {
1181 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1182 return error;
1183 }
1184 transport_add_device(&starget->dev);
1185 starget->state = STARGET_RUNNING;
1186
1187 pm_runtime_set_active(&starget->dev);
1188 pm_runtime_enable(&starget->dev);
1189 device_enable_async_suspend(&starget->dev);
1190
1191 return 0;
1192}
1193
1194/**
1195 * scsi_sysfs_add_sdev - add scsi device to sysfs
1196 * @sdev: scsi_device to add
1197 *
1198 * Return value:
1199 * 0 on Success / non-zero on Failure
1200 **/
1201int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1202{
1203 int error, i;
1204 struct request_queue *rq = sdev->request_queue;
1205 struct scsi_target *starget = sdev->sdev_target;
1206
1207 error = scsi_target_add(starget);
1208 if (error)
1209 return error;
1210
1211 transport_configure_device(&starget->dev);
1212
1213 device_enable_async_suspend(&sdev->sdev_gendev);
1214 scsi_autopm_get_target(starget);
1215 pm_runtime_set_active(&sdev->sdev_gendev);
1216 pm_runtime_forbid(&sdev->sdev_gendev);
1217 pm_runtime_enable(&sdev->sdev_gendev);
1218 scsi_autopm_put_target(starget);
1219
1220 scsi_autopm_get_device(sdev);
1221
1222 error = scsi_dh_add_device(sdev);
1223 if (error)
1224 /*
1225 * device_handler is optional, so any error can be ignored
1226 */
1227 sdev_printk(KERN_INFO, sdev,
1228 "failed to add device handler: %d\n", error);
1229
1230 error = device_add(&sdev->sdev_gendev);
1231 if (error) {
1232 sdev_printk(KERN_INFO, sdev,
1233 "failed to add device: %d\n", error);
1234 scsi_dh_remove_device(sdev);
1235 return error;
1236 }
1237
1238 device_enable_async_suspend(&sdev->sdev_dev);
1239 error = device_add(&sdev->sdev_dev);
1240 if (error) {
1241 sdev_printk(KERN_INFO, sdev,
1242 "failed to add class device: %d\n", error);
1243 scsi_dh_remove_device(sdev);
1244 device_del(&sdev->sdev_gendev);
1245 return error;
1246 }
1247 transport_add_device(&sdev->sdev_gendev);
1248 sdev->is_visible = 1;
1249
1250 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1251
1252 if (error)
1253 /* we're treating error on bsg register as non-fatal,
1254 * so pretend nothing went wrong */
1255 sdev_printk(KERN_INFO, sdev,
1256 "Failed to register bsg queue, errno=%d\n", error);
1257
1258 /* add additional host specific attributes */
1259 if (sdev->host->hostt->sdev_attrs) {
1260 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1261 error = device_create_file(&sdev->sdev_gendev,
1262 sdev->host->hostt->sdev_attrs[i]);
1263 if (error)
1264 return error;
1265 }
1266 }
1267
1268 scsi_autopm_put_device(sdev);
1269 return error;
1270}
1271
1272void __scsi_remove_device(struct scsi_device *sdev)
1273{
1274 struct device *dev = &sdev->sdev_gendev;
1275
1276 /*
1277 * This cleanup path is not reentrant and while it is impossible
1278 * to get a new reference with scsi_device_get() someone can still
1279 * hold a previously acquired one.
1280 */
1281 if (sdev->sdev_state == SDEV_DEL)
1282 return;
1283
1284 if (sdev->is_visible) {
1285 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
1286 return;
1287
1288 bsg_unregister_queue(sdev->request_queue);
1289 device_unregister(&sdev->sdev_dev);
1290 transport_remove_device(dev);
1291 scsi_dh_remove_device(sdev);
1292 device_del(dev);
1293 } else
1294 put_device(&sdev->sdev_dev);
1295
1296 /*
1297 * Stop accepting new requests and wait until all queuecommand() and
1298 * scsi_run_queue() invocations have finished before tearing down the
1299 * device.
1300 */
1301 scsi_device_set_state(sdev, SDEV_DEL);
1302 blk_cleanup_queue(sdev->request_queue);
1303 cancel_work_sync(&sdev->requeue_work);
1304
1305 if (sdev->host->hostt->slave_destroy)
1306 sdev->host->hostt->slave_destroy(sdev);
1307 transport_destroy_device(dev);
1308
1309 /*
1310 * Paired with the kref_get() in scsi_sysfs_initialize(). We have
1311 * remoed sysfs visibility from the device, so make the target
1312 * invisible if this was the last device underneath it.
1313 */
1314 scsi_target_reap(scsi_target(sdev));
1315
1316 put_device(dev);
1317}
1318
1319/**
1320 * scsi_remove_device - unregister a device from the scsi bus
1321 * @sdev: scsi_device to unregister
1322 **/
1323void scsi_remove_device(struct scsi_device *sdev)
1324{
1325 struct Scsi_Host *shost = sdev->host;
1326
1327 mutex_lock(&shost->scan_mutex);
1328 __scsi_remove_device(sdev);
1329 mutex_unlock(&shost->scan_mutex);
1330}
1331EXPORT_SYMBOL(scsi_remove_device);
1332
1333static void __scsi_remove_target(struct scsi_target *starget)
1334{
1335 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1336 unsigned long flags;
1337 struct scsi_device *sdev;
1338
1339 spin_lock_irqsave(shost->host_lock, flags);
1340 restart:
1341 list_for_each_entry(sdev, &shost->__devices, siblings) {
1342 if (sdev->channel != starget->channel ||
1343 sdev->id != starget->id ||
1344 scsi_device_get(sdev))
1345 continue;
1346 spin_unlock_irqrestore(shost->host_lock, flags);
1347 scsi_remove_device(sdev);
1348 scsi_device_put(sdev);
1349 spin_lock_irqsave(shost->host_lock, flags);
1350 goto restart;
1351 }
1352 spin_unlock_irqrestore(shost->host_lock, flags);
1353}
1354
1355/**
1356 * scsi_remove_target - try to remove a target and all its devices
1357 * @dev: generic starget or parent of generic stargets to be removed
1358 *
1359 * Note: This is slightly racy. It is possible that if the user
1360 * requests the addition of another device then the target won't be
1361 * removed.
1362 */
1363void scsi_remove_target(struct device *dev)
1364{
1365 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1366 struct scsi_target *starget;
1367 unsigned long flags;
1368
1369restart:
1370 spin_lock_irqsave(shost->host_lock, flags);
1371 list_for_each_entry(starget, &shost->__targets, siblings) {
1372 if (starget->state == STARGET_DEL ||
1373 starget->state == STARGET_REMOVE)
1374 continue;
1375 if (starget->dev.parent == dev || &starget->dev == dev) {
1376 kref_get(&starget->reap_ref);
1377 starget->state = STARGET_REMOVE;
1378 spin_unlock_irqrestore(shost->host_lock, flags);
1379 __scsi_remove_target(starget);
1380 scsi_target_reap(starget);
1381 goto restart;
1382 }
1383 }
1384 spin_unlock_irqrestore(shost->host_lock, flags);
1385}
1386EXPORT_SYMBOL(scsi_remove_target);
1387
1388int scsi_register_driver(struct device_driver *drv)
1389{
1390 drv->bus = &scsi_bus_type;
1391
1392 return driver_register(drv);
1393}
1394EXPORT_SYMBOL(scsi_register_driver);
1395
1396int scsi_register_interface(struct class_interface *intf)
1397{
1398 intf->class = &sdev_class;
1399
1400 return class_interface_register(intf);
1401}
1402EXPORT_SYMBOL(scsi_register_interface);
1403
1404/**
1405 * scsi_sysfs_add_host - add scsi host to subsystem
1406 * @shost: scsi host struct to add to subsystem
1407 **/
1408int scsi_sysfs_add_host(struct Scsi_Host *shost)
1409{
1410 int error, i;
1411
1412 /* add host specific attributes */
1413 if (shost->hostt->shost_attrs) {
1414 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1415 error = device_create_file(&shost->shost_dev,
1416 shost->hostt->shost_attrs[i]);
1417 if (error)
1418 return error;
1419 }
1420 }
1421
1422 transport_register_device(&shost->shost_gendev);
1423 transport_configure_device(&shost->shost_gendev);
1424 return 0;
1425}
1426
1427static struct device_type scsi_dev_type = {
1428 .name = "scsi_device",
1429 .release = scsi_device_dev_release,
1430 .groups = scsi_sdev_attr_groups,
1431};
1432
1433void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1434{
1435 unsigned long flags;
1436 struct Scsi_Host *shost = sdev->host;
1437 struct scsi_target *starget = sdev->sdev_target;
1438
1439 device_initialize(&sdev->sdev_gendev);
1440 sdev->sdev_gendev.bus = &scsi_bus_type;
1441 sdev->sdev_gendev.type = &scsi_dev_type;
1442 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1443 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1444
1445 device_initialize(&sdev->sdev_dev);
1446 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1447 sdev->sdev_dev.class = &sdev_class;
1448 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1449 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1450 /*
1451 * Get a default scsi_level from the target (derived from sibling
1452 * devices). This is the best we can do for guessing how to set
1453 * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the
1454 * setting doesn't matter, because all the bits are zero anyway.
1455 * But it does matter for higher LUNs.
1456 */
1457 sdev->scsi_level = starget->scsi_level;
1458 if (sdev->scsi_level <= SCSI_2 &&
1459 sdev->scsi_level != SCSI_UNKNOWN &&
1460 !shost->no_scsi2_lun_in_cdb)
1461 sdev->lun_in_cdb = 1;
1462
1463 transport_setup_device(&sdev->sdev_gendev);
1464 spin_lock_irqsave(shost->host_lock, flags);
1465 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1466 list_add_tail(&sdev->siblings, &shost->__devices);
1467 spin_unlock_irqrestore(shost->host_lock, flags);
1468 /*
1469 * device can now only be removed via __scsi_remove_device() so hold
1470 * the target. Target will be held in CREATED state until something
1471 * beneath it becomes visible (in which case it moves to RUNNING)
1472 */
1473 kref_get(&starget->reap_ref);
1474}
1475
1476int scsi_is_sdev_device(const struct device *dev)
1477{
1478 return dev->type == &scsi_dev_type;
1479}
1480EXPORT_SYMBOL(scsi_is_sdev_device);
1481
1482/* A blank transport template that is used in drivers that don't
1483 * yet implement Transport Attributes */
1484struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };