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Merge tag 'v3.10.88' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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 shost_rd_attr(unique_id, "%u\n");
285 shost_rd_attr(host_busy, "%hu\n");
286 shost_rd_attr(cmd_per_lun, "%hd\n");
287 shost_rd_attr(can_queue, "%hd\n");
288 shost_rd_attr(sg_tablesize, "%hu\n");
289 shost_rd_attr(sg_prot_tablesize, "%hu\n");
290 shost_rd_attr(unchecked_isa_dma, "%d\n");
291 shost_rd_attr(prot_capabilities, "%u\n");
292 shost_rd_attr(prot_guard_type, "%hd\n");
293 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
294
295 static struct attribute *scsi_sysfs_shost_attrs[] = {
296 &dev_attr_unique_id.attr,
297 &dev_attr_host_busy.attr,
298 &dev_attr_cmd_per_lun.attr,
299 &dev_attr_can_queue.attr,
300 &dev_attr_sg_tablesize.attr,
301 &dev_attr_sg_prot_tablesize.attr,
302 &dev_attr_unchecked_isa_dma.attr,
303 &dev_attr_proc_name.attr,
304 &dev_attr_scan.attr,
305 &dev_attr_hstate.attr,
306 &dev_attr_supported_mode.attr,
307 &dev_attr_active_mode.attr,
308 &dev_attr_prot_capabilities.attr,
309 &dev_attr_prot_guard_type.attr,
310 &dev_attr_host_reset.attr,
311 NULL
312 };
313
314 struct attribute_group scsi_shost_attr_group = {
315 .attrs = scsi_sysfs_shost_attrs,
316 };
317
318 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
319 &scsi_shost_attr_group,
320 NULL
321 };
322
323 static void scsi_device_cls_release(struct device *class_dev)
324 {
325 struct scsi_device *sdev;
326
327 sdev = class_to_sdev(class_dev);
328 put_device(&sdev->sdev_gendev);
329 }
330
331 static void scsi_device_dev_release_usercontext(struct work_struct *work)
332 {
333 struct scsi_device *sdev;
334 struct device *parent;
335 struct list_head *this, *tmp;
336 unsigned long flags;
337
338 sdev = container_of(work, struct scsi_device, ew.work);
339
340 parent = sdev->sdev_gendev.parent;
341
342 spin_lock_irqsave(sdev->host->host_lock, flags);
343 list_del(&sdev->siblings);
344 list_del(&sdev->same_target_siblings);
345 list_del(&sdev->starved_entry);
346 spin_unlock_irqrestore(sdev->host->host_lock, flags);
347
348 cancel_work_sync(&sdev->event_work);
349
350 list_for_each_safe(this, tmp, &sdev->event_list) {
351 struct scsi_event *evt;
352
353 evt = list_entry(this, struct scsi_event, node);
354 list_del(&evt->node);
355 kfree(evt);
356 }
357
358 blk_put_queue(sdev->request_queue);
359 /* NULL queue means the device can't be used */
360 sdev->request_queue = NULL;
361
362 kfree(sdev->inquiry);
363 kfree(sdev);
364
365 if (parent)
366 put_device(parent);
367 }
368
369 static void scsi_device_dev_release(struct device *dev)
370 {
371 struct scsi_device *sdp = to_scsi_device(dev);
372 execute_in_process_context(scsi_device_dev_release_usercontext,
373 &sdp->ew);
374 }
375
376 static struct class sdev_class = {
377 .name = "scsi_device",
378 .dev_release = scsi_device_cls_release,
379 };
380
381 /* all probing is done in the individual ->probe routines */
382 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
383 {
384 struct scsi_device *sdp;
385
386 if (dev->type != &scsi_dev_type)
387 return 0;
388
389 sdp = to_scsi_device(dev);
390 if (sdp->no_uld_attach)
391 return 0;
392 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
393 }
394
395 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
396 {
397 struct scsi_device *sdev;
398
399 if (dev->type != &scsi_dev_type)
400 return 0;
401
402 sdev = to_scsi_device(dev);
403
404 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
405 return 0;
406 }
407
408 struct bus_type scsi_bus_type = {
409 .name = "scsi",
410 .match = scsi_bus_match,
411 .uevent = scsi_bus_uevent,
412 #ifdef CONFIG_PM
413 .pm = &scsi_bus_pm_ops,
414 #endif
415 };
416 EXPORT_SYMBOL_GPL(scsi_bus_type);
417
418 int scsi_sysfs_register(void)
419 {
420 int error;
421
422 error = bus_register(&scsi_bus_type);
423 if (!error) {
424 error = class_register(&sdev_class);
425 if (error)
426 bus_unregister(&scsi_bus_type);
427 }
428
429 return error;
430 }
431
432 void scsi_sysfs_unregister(void)
433 {
434 class_unregister(&sdev_class);
435 bus_unregister(&scsi_bus_type);
436 }
437
438 /*
439 * sdev_show_function: macro to create an attr function that can be used to
440 * show a non-bit field.
441 */
442 #define sdev_show_function(field, format_string) \
443 static ssize_t \
444 sdev_show_##field (struct device *dev, struct device_attribute *attr, \
445 char *buf) \
446 { \
447 struct scsi_device *sdev; \
448 sdev = to_scsi_device(dev); \
449 return snprintf (buf, 20, format_string, sdev->field); \
450 } \
451
452 /*
453 * sdev_rd_attr: macro to create a function and attribute variable for a
454 * read only field.
455 */
456 #define sdev_rd_attr(field, format_string) \
457 sdev_show_function(field, format_string) \
458 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
459
460
461 /*
462 * sdev_rw_attr: create a function and attribute variable for a
463 * read/write field.
464 */
465 #define sdev_rw_attr(field, format_string) \
466 sdev_show_function(field, format_string) \
467 \
468 static ssize_t \
469 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
470 const char *buf, size_t count) \
471 { \
472 struct scsi_device *sdev; \
473 sdev = to_scsi_device(dev); \
474 sscanf (buf, format_string, &sdev->field); \
475 return count; \
476 } \
477 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
478
479 /* Currently we don't export bit fields, but we might in future,
480 * so leave this code in */
481 #if 0
482 /*
483 * sdev_rd_attr: create a function and attribute variable for a
484 * read/write bit field.
485 */
486 #define sdev_rw_attr_bit(field) \
487 sdev_show_function(field, "%d\n") \
488 \
489 static ssize_t \
490 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
491 const char *buf, size_t count) \
492 { \
493 int ret; \
494 struct scsi_device *sdev; \
495 ret = scsi_sdev_check_buf_bit(buf); \
496 if (ret >= 0) { \
497 sdev = to_scsi_device(dev); \
498 sdev->field = ret; \
499 ret = count; \
500 } \
501 return ret; \
502 } \
503 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
504
505 /*
506 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
507 * else return -EINVAL.
508 */
509 static int scsi_sdev_check_buf_bit(const char *buf)
510 {
511 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
512 if (buf[0] == '1')
513 return 1;
514 else if (buf[0] == '0')
515 return 0;
516 else
517 return -EINVAL;
518 } else
519 return -EINVAL;
520 }
521 #endif
522 /*
523 * Create the actual show/store functions and data structures.
524 */
525 sdev_rd_attr (device_blocked, "%d\n");
526 sdev_rd_attr (queue_depth, "%d\n");
527 sdev_rd_attr (type, "%d\n");
528 sdev_rd_attr (scsi_level, "%d\n");
529 sdev_rd_attr (vendor, "%.8s\n");
530 sdev_rd_attr (model, "%.16s\n");
531 sdev_rd_attr (rev, "%.4s\n");
532
533 /*
534 * TODO: can we make these symlinks to the block layer ones?
535 */
536 static ssize_t
537 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
538 {
539 struct scsi_device *sdev;
540 sdev = to_scsi_device(dev);
541 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
542 }
543
544 static ssize_t
545 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
546 const char *buf, size_t count)
547 {
548 struct scsi_device *sdev;
549 int timeout;
550 sdev = to_scsi_device(dev);
551 sscanf (buf, "%d\n", &timeout);
552 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
553 return count;
554 }
555 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
556
557 static ssize_t
558 store_rescan_field (struct device *dev, struct device_attribute *attr,
559 const char *buf, size_t count)
560 {
561 scsi_rescan_device(dev);
562 return count;
563 }
564 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
565
566 static void sdev_store_delete_callback(struct device *dev)
567 {
568 scsi_remove_device(to_scsi_device(dev));
569 }
570
571 static ssize_t
572 sdev_store_delete(struct device *dev, struct device_attribute *attr,
573 const char *buf, size_t count)
574 {
575 int rc;
576
577 /* An attribute cannot be unregistered by one of its own methods,
578 * so we have to use this roundabout approach.
579 */
580 rc = device_schedule_callback(dev, sdev_store_delete_callback);
581 if (rc)
582 count = rc;
583 return count;
584 };
585 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
586
587 static ssize_t
588 store_state_field(struct device *dev, struct device_attribute *attr,
589 const char *buf, size_t count)
590 {
591 int i;
592 struct scsi_device *sdev = to_scsi_device(dev);
593 enum scsi_device_state state = 0;
594
595 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
596 const int len = strlen(sdev_states[i].name);
597 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
598 buf[len] == '\n') {
599 state = sdev_states[i].value;
600 break;
601 }
602 }
603 if (!state)
604 return -EINVAL;
605
606 if (scsi_device_set_state(sdev, state))
607 return -EINVAL;
608 return count;
609 }
610
611 static ssize_t
612 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
613 {
614 struct scsi_device *sdev = to_scsi_device(dev);
615 const char *name = scsi_device_state_name(sdev->sdev_state);
616
617 if (!name)
618 return -EINVAL;
619
620 return snprintf(buf, 20, "%s\n", name);
621 }
622
623 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
624
625 static ssize_t
626 show_queue_type_field(struct device *dev, struct device_attribute *attr,
627 char *buf)
628 {
629 struct scsi_device *sdev = to_scsi_device(dev);
630 const char *name = "none";
631
632 if (sdev->ordered_tags)
633 name = "ordered";
634 else if (sdev->simple_tags)
635 name = "simple";
636
637 return snprintf(buf, 20, "%s\n", name);
638 }
639
640 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
641
642 static ssize_t
643 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
644 {
645 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
646 }
647
648 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
649
650 #define show_sdev_iostat(field) \
651 static ssize_t \
652 show_iostat_##field(struct device *dev, struct device_attribute *attr, \
653 char *buf) \
654 { \
655 struct scsi_device *sdev = to_scsi_device(dev); \
656 unsigned long long count = atomic_read(&sdev->field); \
657 return snprintf(buf, 20, "0x%llx\n", count); \
658 } \
659 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
660
661 show_sdev_iostat(iorequest_cnt);
662 show_sdev_iostat(iodone_cnt);
663 show_sdev_iostat(ioerr_cnt);
664
665 static ssize_t
666 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
667 {
668 struct scsi_device *sdev;
669 sdev = to_scsi_device(dev);
670 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
671 }
672 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
673
674 #define DECLARE_EVT_SHOW(name, Cap_name) \
675 static ssize_t \
676 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
677 char *buf) \
678 { \
679 struct scsi_device *sdev = to_scsi_device(dev); \
680 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
681 return snprintf(buf, 20, "%d\n", val); \
682 }
683
684 #define DECLARE_EVT_STORE(name, Cap_name) \
685 static ssize_t \
686 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
687 const char *buf, size_t count) \
688 { \
689 struct scsi_device *sdev = to_scsi_device(dev); \
690 int val = simple_strtoul(buf, NULL, 0); \
691 if (val == 0) \
692 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
693 else if (val == 1) \
694 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
695 else \
696 return -EINVAL; \
697 return count; \
698 }
699
700 #define DECLARE_EVT(name, Cap_name) \
701 DECLARE_EVT_SHOW(name, Cap_name) \
702 DECLARE_EVT_STORE(name, Cap_name) \
703 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
704 sdev_store_evt_##name);
705 #define REF_EVT(name) &dev_attr_evt_##name.attr
706
707 DECLARE_EVT(media_change, MEDIA_CHANGE)
708
709 /* Default template for device attributes. May NOT be modified */
710 static struct attribute *scsi_sdev_attrs[] = {
711 &dev_attr_device_blocked.attr,
712 &dev_attr_type.attr,
713 &dev_attr_scsi_level.attr,
714 &dev_attr_vendor.attr,
715 &dev_attr_model.attr,
716 &dev_attr_rev.attr,
717 &dev_attr_rescan.attr,
718 &dev_attr_delete.attr,
719 &dev_attr_state.attr,
720 &dev_attr_timeout.attr,
721 &dev_attr_iocounterbits.attr,
722 &dev_attr_iorequest_cnt.attr,
723 &dev_attr_iodone_cnt.attr,
724 &dev_attr_ioerr_cnt.attr,
725 &dev_attr_modalias.attr,
726 REF_EVT(media_change),
727 NULL
728 };
729
730 static struct attribute_group scsi_sdev_attr_group = {
731 .attrs = scsi_sdev_attrs,
732 };
733
734 static const struct attribute_group *scsi_sdev_attr_groups[] = {
735 &scsi_sdev_attr_group,
736 NULL
737 };
738
739 static ssize_t
740 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
741 const char *buf, size_t count)
742 {
743 int depth, retval;
744 struct scsi_device *sdev = to_scsi_device(dev);
745 struct scsi_host_template *sht = sdev->host->hostt;
746
747 if (!sht->change_queue_depth)
748 return -EINVAL;
749
750 depth = simple_strtoul(buf, NULL, 0);
751
752 if (depth < 1)
753 return -EINVAL;
754
755 retval = sht->change_queue_depth(sdev, depth,
756 SCSI_QDEPTH_DEFAULT);
757 if (retval < 0)
758 return retval;
759
760 sdev->max_queue_depth = sdev->queue_depth;
761
762 return count;
763 }
764
765 static struct device_attribute sdev_attr_queue_depth_rw =
766 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
767 sdev_store_queue_depth_rw);
768
769 static ssize_t
770 sdev_show_queue_ramp_up_period(struct device *dev,
771 struct device_attribute *attr,
772 char *buf)
773 {
774 struct scsi_device *sdev;
775 sdev = to_scsi_device(dev);
776 return snprintf(buf, 20, "%u\n",
777 jiffies_to_msecs(sdev->queue_ramp_up_period));
778 }
779
780 static ssize_t
781 sdev_store_queue_ramp_up_period(struct device *dev,
782 struct device_attribute *attr,
783 const char *buf, size_t count)
784 {
785 struct scsi_device *sdev = to_scsi_device(dev);
786 unsigned long period;
787
788 if (strict_strtoul(buf, 10, &period))
789 return -EINVAL;
790
791 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
792 return period;
793 }
794
795 static struct device_attribute sdev_attr_queue_ramp_up_period =
796 __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
797 sdev_show_queue_ramp_up_period,
798 sdev_store_queue_ramp_up_period);
799
800 static ssize_t
801 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
802 const char *buf, size_t count)
803 {
804 struct scsi_device *sdev = to_scsi_device(dev);
805 struct scsi_host_template *sht = sdev->host->hostt;
806 int tag_type = 0, retval;
807 int prev_tag_type = scsi_get_tag_type(sdev);
808
809 if (!sdev->tagged_supported || !sht->change_queue_type)
810 return -EINVAL;
811
812 if (strncmp(buf, "ordered", 7) == 0)
813 tag_type = MSG_ORDERED_TAG;
814 else if (strncmp(buf, "simple", 6) == 0)
815 tag_type = MSG_SIMPLE_TAG;
816 else if (strncmp(buf, "none", 4) != 0)
817 return -EINVAL;
818
819 if (tag_type == prev_tag_type)
820 return count;
821
822 retval = sht->change_queue_type(sdev, tag_type);
823 if (retval < 0)
824 return retval;
825
826 return count;
827 }
828
829 static int scsi_target_add(struct scsi_target *starget)
830 {
831 int error;
832
833 if (starget->state != STARGET_CREATED)
834 return 0;
835
836 error = device_add(&starget->dev);
837 if (error) {
838 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
839 return error;
840 }
841 transport_add_device(&starget->dev);
842 starget->state = STARGET_RUNNING;
843
844 pm_runtime_set_active(&starget->dev);
845 pm_runtime_enable(&starget->dev);
846 device_enable_async_suspend(&starget->dev);
847
848 return 0;
849 }
850
851 static struct device_attribute sdev_attr_queue_type_rw =
852 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
853 sdev_store_queue_type_rw);
854
855 /**
856 * scsi_sysfs_add_sdev - add scsi device to sysfs
857 * @sdev: scsi_device to add
858 *
859 * Return value:
860 * 0 on Success / non-zero on Failure
861 **/
862 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
863 {
864 int error, i;
865 struct request_queue *rq = sdev->request_queue;
866 struct scsi_target *starget = sdev->sdev_target;
867
868 error = scsi_device_set_state(sdev, SDEV_RUNNING);
869 if (error)
870 return error;
871
872 error = scsi_target_add(starget);
873 if (error)
874 return error;
875
876 transport_configure_device(&starget->dev);
877
878 device_enable_async_suspend(&sdev->sdev_gendev);
879 scsi_autopm_get_target(starget);
880 pm_runtime_set_active(&sdev->sdev_gendev);
881 pm_runtime_forbid(&sdev->sdev_gendev);
882 pm_runtime_enable(&sdev->sdev_gendev);
883 scsi_autopm_put_target(starget);
884
885 /* The following call will keep sdev active indefinitely, until
886 * its driver does a corresponding scsi_autopm_pm_device(). Only
887 * drivers supporting autosuspend will do this.
888 */
889 scsi_autopm_get_device(sdev);
890
891 error = device_add(&sdev->sdev_gendev);
892 if (error) {
893 sdev_printk(KERN_INFO, sdev,
894 "failed to add device: %d\n", error);
895 return error;
896 }
897 device_enable_async_suspend(&sdev->sdev_dev);
898 error = device_add(&sdev->sdev_dev);
899 if (error) {
900 sdev_printk(KERN_INFO, sdev,
901 "failed to add class device: %d\n", error);
902 device_del(&sdev->sdev_gendev);
903 return error;
904 }
905 transport_add_device(&sdev->sdev_gendev);
906 sdev->is_visible = 1;
907
908 /* create queue files, which may be writable, depending on the host */
909 if (sdev->host->hostt->change_queue_depth) {
910 error = device_create_file(&sdev->sdev_gendev,
911 &sdev_attr_queue_depth_rw);
912 error = device_create_file(&sdev->sdev_gendev,
913 &sdev_attr_queue_ramp_up_period);
914 }
915 else
916 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
917 if (error)
918 return error;
919
920 if (sdev->host->hostt->change_queue_type)
921 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
922 else
923 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
924 if (error)
925 return error;
926
927 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
928
929 if (error)
930 /* we're treating error on bsg register as non-fatal,
931 * so pretend nothing went wrong */
932 sdev_printk(KERN_INFO, sdev,
933 "Failed to register bsg queue, errno=%d\n", error);
934
935 /* add additional host specific attributes */
936 if (sdev->host->hostt->sdev_attrs) {
937 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
938 error = device_create_file(&sdev->sdev_gendev,
939 sdev->host->hostt->sdev_attrs[i]);
940 if (error)
941 return error;
942 }
943 }
944
945 return error;
946 }
947
948 void __scsi_remove_device(struct scsi_device *sdev)
949 {
950 struct device *dev = &sdev->sdev_gendev;
951
952 if (sdev->is_visible) {
953 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
954 return;
955
956 bsg_unregister_queue(sdev->request_queue);
957 device_unregister(&sdev->sdev_dev);
958 transport_remove_device(dev);
959 device_del(dev);
960 } else
961 put_device(&sdev->sdev_dev);
962
963 /*
964 * Stop accepting new requests and wait until all queuecommand() and
965 * scsi_run_queue() invocations have finished before tearing down the
966 * device.
967 */
968 scsi_device_set_state(sdev, SDEV_DEL);
969 blk_cleanup_queue(sdev->request_queue);
970 cancel_work_sync(&sdev->requeue_work);
971
972 if (sdev->host->hostt->slave_destroy)
973 sdev->host->hostt->slave_destroy(sdev);
974 transport_destroy_device(dev);
975
976 /*
977 * Paired with the kref_get() in scsi_sysfs_initialize(). We have
978 * remoed sysfs visibility from the device, so make the target
979 * invisible if this was the last device underneath it.
980 */
981 scsi_target_reap(scsi_target(sdev));
982
983 put_device(dev);
984 }
985
986 /**
987 * scsi_remove_device - unregister a device from the scsi bus
988 * @sdev: scsi_device to unregister
989 **/
990 void scsi_remove_device(struct scsi_device *sdev)
991 {
992 struct Scsi_Host *shost = sdev->host;
993
994 mutex_lock(&shost->scan_mutex);
995 __scsi_remove_device(sdev);
996 mutex_unlock(&shost->scan_mutex);
997 }
998 EXPORT_SYMBOL(scsi_remove_device);
999
1000 static void __scsi_remove_target(struct scsi_target *starget)
1001 {
1002 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1003 unsigned long flags;
1004 struct scsi_device *sdev;
1005
1006 spin_lock_irqsave(shost->host_lock, flags);
1007 restart:
1008 list_for_each_entry(sdev, &shost->__devices, siblings) {
1009 if (sdev->channel != starget->channel ||
1010 sdev->id != starget->id ||
1011 scsi_device_get(sdev))
1012 continue;
1013 spin_unlock_irqrestore(shost->host_lock, flags);
1014 scsi_remove_device(sdev);
1015 scsi_device_put(sdev);
1016 spin_lock_irqsave(shost->host_lock, flags);
1017 goto restart;
1018 }
1019 spin_unlock_irqrestore(shost->host_lock, flags);
1020 }
1021
1022 /**
1023 * scsi_remove_target - try to remove a target and all its devices
1024 * @dev: generic starget or parent of generic stargets to be removed
1025 *
1026 * Note: This is slightly racy. It is possible that if the user
1027 * requests the addition of another device then the target won't be
1028 * removed.
1029 */
1030 void scsi_remove_target(struct device *dev)
1031 {
1032 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1033 struct scsi_target *starget, *last = NULL;
1034 unsigned long flags;
1035
1036 /* remove targets being careful to lookup next entry before
1037 * deleting the last
1038 */
1039 spin_lock_irqsave(shost->host_lock, flags);
1040 list_for_each_entry(starget, &shost->__targets, siblings) {
1041 if (starget->state == STARGET_DEL)
1042 continue;
1043 if (starget->dev.parent == dev || &starget->dev == dev) {
1044 /* assuming new targets arrive at the end */
1045 kref_get(&starget->reap_ref);
1046 spin_unlock_irqrestore(shost->host_lock, flags);
1047 if (last)
1048 scsi_target_reap(last);
1049 last = starget;
1050 __scsi_remove_target(starget);
1051 spin_lock_irqsave(shost->host_lock, flags);
1052 }
1053 }
1054 spin_unlock_irqrestore(shost->host_lock, flags);
1055
1056 if (last)
1057 scsi_target_reap(last);
1058 }
1059 EXPORT_SYMBOL(scsi_remove_target);
1060
1061 int scsi_register_driver(struct device_driver *drv)
1062 {
1063 drv->bus = &scsi_bus_type;
1064
1065 return driver_register(drv);
1066 }
1067 EXPORT_SYMBOL(scsi_register_driver);
1068
1069 int scsi_register_interface(struct class_interface *intf)
1070 {
1071 intf->class = &sdev_class;
1072
1073 return class_interface_register(intf);
1074 }
1075 EXPORT_SYMBOL(scsi_register_interface);
1076
1077 /**
1078 * scsi_sysfs_add_host - add scsi host to subsystem
1079 * @shost: scsi host struct to add to subsystem
1080 **/
1081 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1082 {
1083 int error, i;
1084
1085 /* add host specific attributes */
1086 if (shost->hostt->shost_attrs) {
1087 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1088 error = device_create_file(&shost->shost_dev,
1089 shost->hostt->shost_attrs[i]);
1090 if (error)
1091 return error;
1092 }
1093 }
1094
1095 transport_register_device(&shost->shost_gendev);
1096 transport_configure_device(&shost->shost_gendev);
1097 return 0;
1098 }
1099
1100 static struct device_type scsi_dev_type = {
1101 .name = "scsi_device",
1102 .release = scsi_device_dev_release,
1103 .groups = scsi_sdev_attr_groups,
1104 };
1105
1106 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1107 {
1108 unsigned long flags;
1109 struct Scsi_Host *shost = sdev->host;
1110 struct scsi_target *starget = sdev->sdev_target;
1111
1112 device_initialize(&sdev->sdev_gendev);
1113 sdev->sdev_gendev.bus = &scsi_bus_type;
1114 sdev->sdev_gendev.type = &scsi_dev_type;
1115 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1116 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1117
1118 device_initialize(&sdev->sdev_dev);
1119 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1120 sdev->sdev_dev.class = &sdev_class;
1121 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1122 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1123 sdev->scsi_level = starget->scsi_level;
1124 transport_setup_device(&sdev->sdev_gendev);
1125 spin_lock_irqsave(shost->host_lock, flags);
1126 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1127 list_add_tail(&sdev->siblings, &shost->__devices);
1128 spin_unlock_irqrestore(shost->host_lock, flags);
1129 /*
1130 * device can now only be removed via __scsi_remove_device() so hold
1131 * the target. Target will be held in CREATED state until something
1132 * beneath it becomes visible (in which case it moves to RUNNING)
1133 */
1134 kref_get(&starget->reap_ref);
1135 }
1136
1137 int scsi_is_sdev_device(const struct device *dev)
1138 {
1139 return dev->type == &scsi_dev_type;
1140 }
1141 EXPORT_SYMBOL(scsi_is_sdev_device);
1142
1143 /* A blank transport template that is used in drivers that don't
1144 * yet implement Transport Attributes */
1145 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
kernel source for telekom puls (alcatel/mediatek)