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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[deliverable/linux.git] / drivers / scsi / scsi_sysfs.c
1 /*
2 * scsi_sysfs.c
3 *
4 * SCSI sysfs interface routines.
5 *
6 * Created to pull SCSI mid layer sysfs routines into one file.
7 */
8
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/init.h>
12 #include <linux/blkdev.h>
13 #include <linux/device.h>
14 #include <linux/pm_runtime.h>
15
16 #include <scsi/scsi.h>
17 #include <scsi/scsi_device.h>
18 #include <scsi/scsi_host.h>
19 #include <scsi/scsi_tcq.h>
20 #include <scsi/scsi_transport.h>
21 #include <scsi/scsi_driver.h>
22
23 #include "scsi_priv.h"
24 #include "scsi_logging.h"
25
26 static struct device_type scsi_dev_type;
27
28 static 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
43 const 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
57 static 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 };
69 const 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
83 static int check_set(unsigned long long *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_strtoull(src, &last, 0);
94 if (*last != '\0')
95 return 1;
96 }
97 return 0;
98 }
99
100 static int scsi_scan(struct Scsi_Host *shost, const char *str)
101 {
102 char s1[15], s2[15], s3[17], junk;
103 unsigned long long channel, id, lun;
104 int res;
105
106 res = sscanf(str, "%10s %10s %16s %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) \
127 static ssize_t \
128 show_##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) \
141 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
142
143 #define shost_rd_attr(field, format_string) \
144 shost_rd_attr2(field, field, format_string)
145
146 /*
147 * Create the actual show/store functions and data structures.
148 */
149
150 static ssize_t
151 store_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 };
162 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
163
164 static ssize_t
165 store_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
188 static ssize_t
189 show_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 */
201 struct device_attribute dev_attr_hstate =
202 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
203
204 static ssize_t
205 show_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
220 static ssize_t
221 show_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
234 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
235
236 static ssize_t
237 show_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
248 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
249
250 static 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
260 static ssize_t
261 store_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
276 exit_store_host_reset:
277 if (ret == 0)
278 ret = count;
279 return ret;
280 }
281
282 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
283
284 static ssize_t
285 show_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
295 static ssize_t
296 store_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
334 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
335
336 shost_rd_attr(use_blk_mq, "%d\n");
337 shost_rd_attr(unique_id, "%u\n");
338 shost_rd_attr(cmd_per_lun, "%hd\n");
339 shost_rd_attr(can_queue, "%hd\n");
340 shost_rd_attr(sg_tablesize, "%hu\n");
341 shost_rd_attr(sg_prot_tablesize, "%hu\n");
342 shost_rd_attr(unchecked_isa_dma, "%d\n");
343 shost_rd_attr(prot_capabilities, "%u\n");
344 shost_rd_attr(prot_guard_type, "%hd\n");
345 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
346
347 static ssize_t
348 show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
349 {
350 struct Scsi_Host *shost = class_to_shost(dev);
351 return snprintf(buf, 20, "%d\n", atomic_read(&shost->host_busy));
352 }
353 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
354
355 static struct attribute *scsi_sysfs_shost_attrs[] = {
356 &dev_attr_use_blk_mq.attr,
357 &dev_attr_unique_id.attr,
358 &dev_attr_host_busy.attr,
359 &dev_attr_cmd_per_lun.attr,
360 &dev_attr_can_queue.attr,
361 &dev_attr_sg_tablesize.attr,
362 &dev_attr_sg_prot_tablesize.attr,
363 &dev_attr_unchecked_isa_dma.attr,
364 &dev_attr_proc_name.attr,
365 &dev_attr_scan.attr,
366 &dev_attr_hstate.attr,
367 &dev_attr_supported_mode.attr,
368 &dev_attr_active_mode.attr,
369 &dev_attr_prot_capabilities.attr,
370 &dev_attr_prot_guard_type.attr,
371 &dev_attr_host_reset.attr,
372 &dev_attr_eh_deadline.attr,
373 NULL
374 };
375
376 struct attribute_group scsi_shost_attr_group = {
377 .attrs = scsi_sysfs_shost_attrs,
378 };
379
380 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
381 &scsi_shost_attr_group,
382 NULL
383 };
384
385 static void scsi_device_cls_release(struct device *class_dev)
386 {
387 struct scsi_device *sdev;
388
389 sdev = class_to_sdev(class_dev);
390 put_device(&sdev->sdev_gendev);
391 }
392
393 static void scsi_device_dev_release_usercontext(struct work_struct *work)
394 {
395 struct scsi_device *sdev;
396 struct device *parent;
397 struct list_head *this, *tmp;
398 unsigned long flags;
399
400 sdev = container_of(work, struct scsi_device, ew.work);
401
402 parent = sdev->sdev_gendev.parent;
403
404 spin_lock_irqsave(sdev->host->host_lock, flags);
405 list_del(&sdev->siblings);
406 list_del(&sdev->same_target_siblings);
407 list_del(&sdev->starved_entry);
408 spin_unlock_irqrestore(sdev->host->host_lock, flags);
409
410 cancel_work_sync(&sdev->event_work);
411
412 list_for_each_safe(this, tmp, &sdev->event_list) {
413 struct scsi_event *evt;
414
415 evt = list_entry(this, struct scsi_event, node);
416 list_del(&evt->node);
417 kfree(evt);
418 }
419
420 blk_put_queue(sdev->request_queue);
421 /* NULL queue means the device can't be used */
422 sdev->request_queue = NULL;
423
424 kfree(sdev->vpd_pg83);
425 kfree(sdev->vpd_pg80);
426 kfree(sdev->inquiry);
427 kfree(sdev);
428
429 if (parent)
430 put_device(parent);
431 }
432
433 static void scsi_device_dev_release(struct device *dev)
434 {
435 struct scsi_device *sdp = to_scsi_device(dev);
436 execute_in_process_context(scsi_device_dev_release_usercontext,
437 &sdp->ew);
438 }
439
440 static struct class sdev_class = {
441 .name = "scsi_device",
442 .dev_release = scsi_device_cls_release,
443 };
444
445 /* all probing is done in the individual ->probe routines */
446 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
447 {
448 struct scsi_device *sdp;
449
450 if (dev->type != &scsi_dev_type)
451 return 0;
452
453 sdp = to_scsi_device(dev);
454 if (sdp->no_uld_attach)
455 return 0;
456 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
457 }
458
459 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
460 {
461 struct scsi_device *sdev;
462
463 if (dev->type != &scsi_dev_type)
464 return 0;
465
466 sdev = to_scsi_device(dev);
467
468 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
469 return 0;
470 }
471
472 struct bus_type scsi_bus_type = {
473 .name = "scsi",
474 .match = scsi_bus_match,
475 .uevent = scsi_bus_uevent,
476 #ifdef CONFIG_PM
477 .pm = &scsi_bus_pm_ops,
478 #endif
479 };
480 EXPORT_SYMBOL_GPL(scsi_bus_type);
481
482 int scsi_sysfs_register(void)
483 {
484 int error;
485
486 error = bus_register(&scsi_bus_type);
487 if (!error) {
488 error = class_register(&sdev_class);
489 if (error)
490 bus_unregister(&scsi_bus_type);
491 }
492
493 return error;
494 }
495
496 void scsi_sysfs_unregister(void)
497 {
498 class_unregister(&sdev_class);
499 bus_unregister(&scsi_bus_type);
500 }
501
502 /*
503 * sdev_show_function: macro to create an attr function that can be used to
504 * show a non-bit field.
505 */
506 #define sdev_show_function(field, format_string) \
507 static ssize_t \
508 sdev_show_##field (struct device *dev, struct device_attribute *attr, \
509 char *buf) \
510 { \
511 struct scsi_device *sdev; \
512 sdev = to_scsi_device(dev); \
513 return snprintf (buf, 20, format_string, sdev->field); \
514 } \
515
516 /*
517 * sdev_rd_attr: macro to create a function and attribute variable for a
518 * read only field.
519 */
520 #define sdev_rd_attr(field, format_string) \
521 sdev_show_function(field, format_string) \
522 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
523
524
525 /*
526 * sdev_rw_attr: create a function and attribute variable for a
527 * read/write field.
528 */
529 #define sdev_rw_attr(field, format_string) \
530 sdev_show_function(field, format_string) \
531 \
532 static ssize_t \
533 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
534 const char *buf, size_t count) \
535 { \
536 struct scsi_device *sdev; \
537 sdev = to_scsi_device(dev); \
538 sscanf (buf, format_string, &sdev->field); \
539 return count; \
540 } \
541 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
542
543 /* Currently we don't export bit fields, but we might in future,
544 * so leave this code in */
545 #if 0
546 /*
547 * sdev_rd_attr: create a function and attribute variable for a
548 * read/write bit field.
549 */
550 #define sdev_rw_attr_bit(field) \
551 sdev_show_function(field, "%d\n") \
552 \
553 static ssize_t \
554 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
555 const char *buf, size_t count) \
556 { \
557 int ret; \
558 struct scsi_device *sdev; \
559 ret = scsi_sdev_check_buf_bit(buf); \
560 if (ret >= 0) { \
561 sdev = to_scsi_device(dev); \
562 sdev->field = ret; \
563 ret = count; \
564 } \
565 return ret; \
566 } \
567 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
568
569 /*
570 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
571 * else return -EINVAL.
572 */
573 static int scsi_sdev_check_buf_bit(const char *buf)
574 {
575 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
576 if (buf[0] == '1')
577 return 1;
578 else if (buf[0] == '0')
579 return 0;
580 else
581 return -EINVAL;
582 } else
583 return -EINVAL;
584 }
585 #endif
586 /*
587 * Create the actual show/store functions and data structures.
588 */
589 sdev_rd_attr (type, "%d\n");
590 sdev_rd_attr (scsi_level, "%d\n");
591 sdev_rd_attr (vendor, "%.8s\n");
592 sdev_rd_attr (model, "%.16s\n");
593 sdev_rd_attr (rev, "%.4s\n");
594
595 static ssize_t
596 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
597 char *buf)
598 {
599 struct scsi_device *sdev = to_scsi_device(dev);
600 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
601 }
602 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
603
604 static ssize_t
605 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
606 char *buf)
607 {
608 struct scsi_device *sdev = to_scsi_device(dev);
609 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
610 }
611 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
612
613 /*
614 * TODO: can we make these symlinks to the block layer ones?
615 */
616 static ssize_t
617 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
618 {
619 struct scsi_device *sdev;
620 sdev = to_scsi_device(dev);
621 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
622 }
623
624 static ssize_t
625 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
626 const char *buf, size_t count)
627 {
628 struct scsi_device *sdev;
629 int timeout;
630 sdev = to_scsi_device(dev);
631 sscanf (buf, "%d\n", &timeout);
632 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
633 return count;
634 }
635 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
636
637 static ssize_t
638 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
639 {
640 struct scsi_device *sdev;
641 sdev = to_scsi_device(dev);
642 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
643 }
644
645 static ssize_t
646 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
647 const char *buf, size_t count)
648 {
649 struct scsi_device *sdev;
650 unsigned int eh_timeout;
651 int err;
652
653 if (!capable(CAP_SYS_ADMIN))
654 return -EACCES;
655
656 sdev = to_scsi_device(dev);
657 err = kstrtouint(buf, 10, &eh_timeout);
658 if (err)
659 return err;
660 sdev->eh_timeout = eh_timeout * HZ;
661
662 return count;
663 }
664 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
665
666 static ssize_t
667 store_rescan_field (struct device *dev, struct device_attribute *attr,
668 const char *buf, size_t count)
669 {
670 scsi_rescan_device(dev);
671 return count;
672 }
673 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
674
675 static ssize_t
676 sdev_store_delete(struct device *dev, struct device_attribute *attr,
677 const char *buf, size_t count)
678 {
679 if (device_remove_file_self(dev, attr))
680 scsi_remove_device(to_scsi_device(dev));
681 return count;
682 };
683 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
684
685 static ssize_t
686 store_state_field(struct device *dev, struct device_attribute *attr,
687 const char *buf, size_t count)
688 {
689 int i;
690 struct scsi_device *sdev = to_scsi_device(dev);
691 enum scsi_device_state state = 0;
692
693 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
694 const int len = strlen(sdev_states[i].name);
695 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
696 buf[len] == '\n') {
697 state = sdev_states[i].value;
698 break;
699 }
700 }
701 if (!state)
702 return -EINVAL;
703
704 if (scsi_device_set_state(sdev, state))
705 return -EINVAL;
706 return count;
707 }
708
709 static ssize_t
710 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
711 {
712 struct scsi_device *sdev = to_scsi_device(dev);
713 const char *name = scsi_device_state_name(sdev->sdev_state);
714
715 if (!name)
716 return -EINVAL;
717
718 return snprintf(buf, 20, "%s\n", name);
719 }
720
721 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
722
723 static ssize_t
724 show_queue_type_field(struct device *dev, struct device_attribute *attr,
725 char *buf)
726 {
727 struct scsi_device *sdev = to_scsi_device(dev);
728 const char *name = "none";
729
730 if (sdev->simple_tags)
731 name = "simple";
732
733 return snprintf(buf, 20, "%s\n", name);
734 }
735
736 static ssize_t
737 store_queue_type_field(struct device *dev, struct device_attribute *attr,
738 const char *buf, size_t count)
739 {
740 struct scsi_device *sdev = to_scsi_device(dev);
741
742 if (!sdev->tagged_supported)
743 return -EINVAL;
744
745 sdev_printk(KERN_INFO, sdev,
746 "ignoring write to deprecated queue_type attribute");
747 return count;
748 }
749
750 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
751 store_queue_type_field);
752
753 #define sdev_vpd_pg_attr(_page) \
754 static ssize_t \
755 show_vpd_##_page(struct file *filp, struct kobject *kobj, \
756 struct bin_attribute *bin_attr, \
757 char *buf, loff_t off, size_t count) \
758 { \
759 struct device *dev = container_of(kobj, struct device, kobj); \
760 struct scsi_device *sdev = to_scsi_device(dev); \
761 if (!sdev->vpd_##_page) \
762 return -EINVAL; \
763 return memory_read_from_buffer(buf, count, &off, \
764 sdev->vpd_##_page, \
765 sdev->vpd_##_page##_len); \
766 } \
767 static struct bin_attribute dev_attr_vpd_##_page = { \
768 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
769 .size = 0, \
770 .read = show_vpd_##_page, \
771 };
772
773 sdev_vpd_pg_attr(pg83);
774 sdev_vpd_pg_attr(pg80);
775
776 static ssize_t
777 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
778 char *buf)
779 {
780 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
781 }
782
783 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
784
785 #define show_sdev_iostat(field) \
786 static ssize_t \
787 show_iostat_##field(struct device *dev, struct device_attribute *attr, \
788 char *buf) \
789 { \
790 struct scsi_device *sdev = to_scsi_device(dev); \
791 unsigned long long count = atomic_read(&sdev->field); \
792 return snprintf(buf, 20, "0x%llx\n", count); \
793 } \
794 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
795
796 show_sdev_iostat(iorequest_cnt);
797 show_sdev_iostat(iodone_cnt);
798 show_sdev_iostat(ioerr_cnt);
799
800 static ssize_t
801 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
802 {
803 struct scsi_device *sdev;
804 sdev = to_scsi_device(dev);
805 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
806 }
807 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
808
809 #define DECLARE_EVT_SHOW(name, Cap_name) \
810 static ssize_t \
811 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
812 char *buf) \
813 { \
814 struct scsi_device *sdev = to_scsi_device(dev); \
815 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
816 return snprintf(buf, 20, "%d\n", val); \
817 }
818
819 #define DECLARE_EVT_STORE(name, Cap_name) \
820 static ssize_t \
821 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
822 const char *buf, size_t count) \
823 { \
824 struct scsi_device *sdev = to_scsi_device(dev); \
825 int val = simple_strtoul(buf, NULL, 0); \
826 if (val == 0) \
827 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
828 else if (val == 1) \
829 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
830 else \
831 return -EINVAL; \
832 return count; \
833 }
834
835 #define DECLARE_EVT(name, Cap_name) \
836 DECLARE_EVT_SHOW(name, Cap_name) \
837 DECLARE_EVT_STORE(name, Cap_name) \
838 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
839 sdev_store_evt_##name);
840 #define REF_EVT(name) &dev_attr_evt_##name.attr
841
842 DECLARE_EVT(media_change, MEDIA_CHANGE)
843 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
844 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
845 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
846 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
847 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
848
849 static ssize_t
850 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
851 const char *buf, size_t count)
852 {
853 int depth, retval;
854 struct scsi_device *sdev = to_scsi_device(dev);
855 struct scsi_host_template *sht = sdev->host->hostt;
856
857 if (!sht->change_queue_depth)
858 return -EINVAL;
859
860 depth = simple_strtoul(buf, NULL, 0);
861
862 if (depth < 1 || depth > sht->can_queue)
863 return -EINVAL;
864
865 retval = sht->change_queue_depth(sdev, depth);
866 if (retval < 0)
867 return retval;
868
869 sdev->max_queue_depth = sdev->queue_depth;
870
871 return count;
872 }
873 sdev_show_function(queue_depth, "%d\n");
874
875 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
876 sdev_store_queue_depth);
877
878 static ssize_t
879 sdev_show_queue_ramp_up_period(struct device *dev,
880 struct device_attribute *attr,
881 char *buf)
882 {
883 struct scsi_device *sdev;
884 sdev = to_scsi_device(dev);
885 return snprintf(buf, 20, "%u\n",
886 jiffies_to_msecs(sdev->queue_ramp_up_period));
887 }
888
889 static ssize_t
890 sdev_store_queue_ramp_up_period(struct device *dev,
891 struct device_attribute *attr,
892 const char *buf, size_t count)
893 {
894 struct scsi_device *sdev = to_scsi_device(dev);
895 unsigned int period;
896
897 if (kstrtouint(buf, 10, &period))
898 return -EINVAL;
899
900 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
901 return period;
902 }
903
904 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
905 sdev_show_queue_ramp_up_period,
906 sdev_store_queue_ramp_up_period);
907
908 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
909 struct attribute *attr, int i)
910 {
911 struct device *dev = container_of(kobj, struct device, kobj);
912 struct scsi_device *sdev = to_scsi_device(dev);
913
914
915 if (attr == &dev_attr_queue_depth.attr &&
916 !sdev->host->hostt->change_queue_depth)
917 return S_IRUGO;
918
919 if (attr == &dev_attr_queue_ramp_up_period.attr &&
920 !sdev->host->hostt->change_queue_depth)
921 return 0;
922
923 return attr->mode;
924 }
925
926 /* Default template for device attributes. May NOT be modified */
927 static struct attribute *scsi_sdev_attrs[] = {
928 &dev_attr_device_blocked.attr,
929 &dev_attr_type.attr,
930 &dev_attr_scsi_level.attr,
931 &dev_attr_device_busy.attr,
932 &dev_attr_vendor.attr,
933 &dev_attr_model.attr,
934 &dev_attr_rev.attr,
935 &dev_attr_rescan.attr,
936 &dev_attr_delete.attr,
937 &dev_attr_state.attr,
938 &dev_attr_timeout.attr,
939 &dev_attr_eh_timeout.attr,
940 &dev_attr_iocounterbits.attr,
941 &dev_attr_iorequest_cnt.attr,
942 &dev_attr_iodone_cnt.attr,
943 &dev_attr_ioerr_cnt.attr,
944 &dev_attr_modalias.attr,
945 &dev_attr_queue_depth.attr,
946 &dev_attr_queue_type.attr,
947 &dev_attr_queue_ramp_up_period.attr,
948 REF_EVT(media_change),
949 REF_EVT(inquiry_change_reported),
950 REF_EVT(capacity_change_reported),
951 REF_EVT(soft_threshold_reached),
952 REF_EVT(mode_parameter_change_reported),
953 REF_EVT(lun_change_reported),
954 NULL
955 };
956
957 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
958 &dev_attr_vpd_pg83,
959 &dev_attr_vpd_pg80,
960 NULL
961 };
962 static struct attribute_group scsi_sdev_attr_group = {
963 .attrs = scsi_sdev_attrs,
964 .bin_attrs = scsi_sdev_bin_attrs,
965 .is_visible = scsi_sdev_attr_is_visible,
966 };
967
968 static const struct attribute_group *scsi_sdev_attr_groups[] = {
969 &scsi_sdev_attr_group,
970 NULL
971 };
972
973 static int scsi_target_add(struct scsi_target *starget)
974 {
975 int error;
976
977 if (starget->state != STARGET_CREATED)
978 return 0;
979
980 error = device_add(&starget->dev);
981 if (error) {
982 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
983 return error;
984 }
985 transport_add_device(&starget->dev);
986 starget->state = STARGET_RUNNING;
987
988 pm_runtime_set_active(&starget->dev);
989 pm_runtime_enable(&starget->dev);
990 device_enable_async_suspend(&starget->dev);
991
992 return 0;
993 }
994
995 /**
996 * scsi_sysfs_add_sdev - add scsi device to sysfs
997 * @sdev: scsi_device to add
998 *
999 * Return value:
1000 * 0 on Success / non-zero on Failure
1001 **/
1002 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1003 {
1004 int error, i;
1005 struct request_queue *rq = sdev->request_queue;
1006 struct scsi_target *starget = sdev->sdev_target;
1007
1008 error = scsi_device_set_state(sdev, SDEV_RUNNING);
1009 if (error)
1010 return error;
1011
1012 error = scsi_target_add(starget);
1013 if (error)
1014 return error;
1015
1016 transport_configure_device(&starget->dev);
1017
1018 device_enable_async_suspend(&sdev->sdev_gendev);
1019 scsi_autopm_get_target(starget);
1020 pm_runtime_set_active(&sdev->sdev_gendev);
1021 pm_runtime_forbid(&sdev->sdev_gendev);
1022 pm_runtime_enable(&sdev->sdev_gendev);
1023 scsi_autopm_put_target(starget);
1024
1025 scsi_autopm_get_device(sdev);
1026
1027 error = device_add(&sdev->sdev_gendev);
1028 if (error) {
1029 sdev_printk(KERN_INFO, sdev,
1030 "failed to add device: %d\n", error);
1031 return error;
1032 }
1033 device_enable_async_suspend(&sdev->sdev_dev);
1034 error = device_add(&sdev->sdev_dev);
1035 if (error) {
1036 sdev_printk(KERN_INFO, sdev,
1037 "failed to add class device: %d\n", error);
1038 device_del(&sdev->sdev_gendev);
1039 return error;
1040 }
1041 transport_add_device(&sdev->sdev_gendev);
1042 sdev->is_visible = 1;
1043
1044 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1045
1046 if (error)
1047 /* we're treating error on bsg register as non-fatal,
1048 * so pretend nothing went wrong */
1049 sdev_printk(KERN_INFO, sdev,
1050 "Failed to register bsg queue, errno=%d\n", error);
1051
1052 /* add additional host specific attributes */
1053 if (sdev->host->hostt->sdev_attrs) {
1054 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1055 error = device_create_file(&sdev->sdev_gendev,
1056 sdev->host->hostt->sdev_attrs[i]);
1057 if (error)
1058 return error;
1059 }
1060 }
1061
1062 scsi_autopm_put_device(sdev);
1063 return error;
1064 }
1065
1066 void __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 **/
1108 void 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 }
1116 EXPORT_SYMBOL(scsi_remove_device);
1117
1118 static 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 */
1148 void 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 }
1177 EXPORT_SYMBOL(scsi_remove_target);
1178
1179 int scsi_register_driver(struct device_driver *drv)
1180 {
1181 drv->bus = &scsi_bus_type;
1182
1183 return driver_register(drv);
1184 }
1185 EXPORT_SYMBOL(scsi_register_driver);
1186
1187 int scsi_register_interface(struct class_interface *intf)
1188 {
1189 intf->class = &sdev_class;
1190
1191 return class_interface_register(intf);
1192 }
1193 EXPORT_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 **/
1199 int 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
1218 static struct device_type scsi_dev_type = {
1219 .name = "scsi_device",
1220 .release = scsi_device_dev_release,
1221 .groups = scsi_sdev_attr_groups,
1222 };
1223
1224 void 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:%llu",
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:%llu",
1240 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1241 /*
1242 * Get a default scsi_level from the target (derived from sibling
1243 * devices). This is the best we can do for guessing how to set
1244 * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the
1245 * setting doesn't matter, because all the bits are zero anyway.
1246 * But it does matter for higher LUNs.
1247 */
1248 sdev->scsi_level = starget->scsi_level;
1249 if (sdev->scsi_level <= SCSI_2 &&
1250 sdev->scsi_level != SCSI_UNKNOWN &&
1251 !shost->no_scsi2_lun_in_cdb)
1252 sdev->lun_in_cdb = 1;
1253
1254 transport_setup_device(&sdev->sdev_gendev);
1255 spin_lock_irqsave(shost->host_lock, flags);
1256 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1257 list_add_tail(&sdev->siblings, &shost->__devices);
1258 spin_unlock_irqrestore(shost->host_lock, flags);
1259 /*
1260 * device can now only be removed via __scsi_remove_device() so hold
1261 * the target. Target will be held in CREATED state until something
1262 * beneath it becomes visible (in which case it moves to RUNNING)
1263 */
1264 kref_get(&starget->reap_ref);
1265 }
1266
1267 int scsi_is_sdev_device(const struct device *dev)
1268 {
1269 return dev->type == &scsi_dev_type;
1270 }
1271 EXPORT_SYMBOL(scsi_is_sdev_device);
1272
1273 /* A blank transport template that is used in drivers that don't
1274 * yet implement Transport Attributes */
1275 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
Linux kernel - Deliverables
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