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intel_pstate: remove setting P state to MAX on init
[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 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
100 static 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) \
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(unique_id, "%u\n");
337 shost_rd_attr(host_busy, "%hu\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 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
367 struct attribute_group scsi_shost_attr_group = {
368 .attrs = scsi_sysfs_shost_attrs,
369 };
370
371 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
372 &scsi_shost_attr_group,
373 NULL
374 };
375
376 static 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
384 static 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
424 static 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
431 static 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 */
437 static 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
450 static 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
463 struct 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 };
471 EXPORT_SYMBOL_GPL(scsi_bus_type);
472
473 int 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
487 void 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) \
498 static ssize_t \
499 sdev_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) \
513 static 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 \
523 static ssize_t \
524 sdev_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 } \
532 static 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 \
544 static ssize_t \
545 sdev_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 } \
558 static 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 */
564 static 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 */
580 sdev_rd_attr (device_blocked, "%d\n");
581 sdev_rd_attr (device_busy, "%d\n");
582 sdev_rd_attr (type, "%d\n");
583 sdev_rd_attr (scsi_level, "%d\n");
584 sdev_rd_attr (vendor, "%.8s\n");
585 sdev_rd_attr (model, "%.16s\n");
586 sdev_rd_attr (rev, "%.4s\n");
587
588 /*
589 * TODO: can we make these symlinks to the block layer ones?
590 */
591 static ssize_t
592 sdev_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
599 static ssize_t
600 sdev_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 }
610 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
611
612 static ssize_t
613 sdev_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
620 static ssize_t
621 sdev_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 }
639 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
640
641 static ssize_t
642 store_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 }
648 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
649
650 static ssize_t
651 sdev_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 };
658 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
659
660 static ssize_t
661 store_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
684 static ssize_t
685 show_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
696 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
697
698 static ssize_t
699 show_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
713 static ssize_t
714 store_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
742 static 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) \
746 static ssize_t \
747 show_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 } \
759 static 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
765 sdev_vpd_pg_attr(pg83);
766 sdev_vpd_pg_attr(pg80);
767
768 static ssize_t
769 show_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
775 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
776
777 #define show_sdev_iostat(field) \
778 static ssize_t \
779 show_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 } \
786 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
787
788 show_sdev_iostat(iorequest_cnt);
789 show_sdev_iostat(iodone_cnt);
790 show_sdev_iostat(ioerr_cnt);
791
792 static ssize_t
793 sdev_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 }
799 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
800
801 #define DECLARE_EVT_SHOW(name, Cap_name) \
802 static ssize_t \
803 sdev_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) \
812 static ssize_t \
813 sdev_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
834 DECLARE_EVT(media_change, MEDIA_CHANGE)
835 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
836 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
837 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
838 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
839 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
840
841 static ssize_t
842 sdev_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 }
866 sdev_show_function(queue_depth, "%d\n");
867
868 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
869 sdev_store_queue_depth);
870
871 static ssize_t
872 sdev_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
882 static ssize_t
883 sdev_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
897 static 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
901 static 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 */
924 static 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
954 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
955 &dev_attr_vpd_pg83,
956 &dev_attr_vpd_pg80,
957 NULL
958 };
959 static 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
965 static const struct attribute_group *scsi_sdev_attr_groups[] = {
966 &scsi_sdev_attr_group,
967 NULL
968 };
969
970 static 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 **/
999 int 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
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:%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
1255 int scsi_is_sdev_device(const struct device *dev)
1256 {
1257 return dev->type == &scsi_dev_type;
1258 }
1259 EXPORT_SYMBOL(scsi_is_sdev_device);
1260
1261 /* A blank transport template that is used in drivers that don't
1262 * yet implement Transport Attributes */
1263 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
Linux kernel - Deliverables
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