projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for-3.4' of git://linux-nfs.org/~bfields/linux
[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_BLOCK, "blocked" },
39 { SDEV_CREATED_BLOCK, "created-blocked" },
40 };
41
42 const char *scsi_device_state_name(enum scsi_device_state state)
43 {
44 int i;
45 char *name = NULL;
46
47 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
48 if (sdev_states[i].value == state) {
49 name = sdev_states[i].name;
50 break;
51 }
52 }
53 return name;
54 }
55
56 static const struct {
57 enum scsi_host_state value;
58 char *name;
59 } shost_states[] = {
60 { SHOST_CREATED, "created" },
61 { SHOST_RUNNING, "running" },
62 { SHOST_CANCEL, "cancel" },
63 { SHOST_DEL, "deleted" },
64 { SHOST_RECOVERY, "recovery" },
65 { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
66 { SHOST_DEL_RECOVERY, "deleted/recovery", },
67 };
68 const char *scsi_host_state_name(enum scsi_host_state state)
69 {
70 int i;
71 char *name = NULL;
72
73 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
74 if (shost_states[i].value == state) {
75 name = shost_states[i].name;
76 break;
77 }
78 }
79 return name;
80 }
81
82 static int check_set(unsigned int *val, char *src)
83 {
84 char *last;
85
86 if (strncmp(src, "-", 20) == 0) {
87 *val = SCAN_WILD_CARD;
88 } else {
89 /*
90 * Doesn't check for int overflow
91 */
92 *val = simple_strtoul(src, &last, 0);
93 if (*last != '\0')
94 return 1;
95 }
96 return 0;
97 }
98
99 static int scsi_scan(struct Scsi_Host *shost, const char *str)
100 {
101 char s1[15], s2[15], s3[15], junk;
102 unsigned int channel, id, lun;
103 int res;
104
105 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
106 if (res != 3)
107 return -EINVAL;
108 if (check_set(&channel, s1))
109 return -EINVAL;
110 if (check_set(&id, s2))
111 return -EINVAL;
112 if (check_set(&lun, s3))
113 return -EINVAL;
114 if (shost->transportt->user_scan)
115 res = shost->transportt->user_scan(shost, channel, id, lun);
116 else
117 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
118 return res;
119 }
120
121 /*
122 * shost_show_function: macro to create an attr function that can be used to
123 * show a non-bit field.
124 */
125 #define shost_show_function(name, field, format_string) \
126 static ssize_t \
127 show_##name (struct device *dev, struct device_attribute *attr, \
128 char *buf) \
129 { \
130 struct Scsi_Host *shost = class_to_shost(dev); \
131 return snprintf (buf, 20, format_string, shost->field); \
132 }
133
134 /*
135 * shost_rd_attr: macro to create a function and attribute variable for a
136 * read only field.
137 */
138 #define shost_rd_attr2(name, field, format_string) \
139 shost_show_function(name, field, format_string) \
140 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
141
142 #define shost_rd_attr(field, format_string) \
143 shost_rd_attr2(field, field, format_string)
144
145 /*
146 * Create the actual show/store functions and data structures.
147 */
148
149 static ssize_t
150 store_scan(struct device *dev, struct device_attribute *attr,
151 const char *buf, size_t count)
152 {
153 struct Scsi_Host *shost = class_to_shost(dev);
154 int res;
155
156 res = scsi_scan(shost, buf);
157 if (res == 0)
158 res = count;
159 return res;
160 };
161 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
162
163 static ssize_t
164 store_shost_state(struct device *dev, struct device_attribute *attr,
165 const char *buf, size_t count)
166 {
167 int i;
168 struct Scsi_Host *shost = class_to_shost(dev);
169 enum scsi_host_state state = 0;
170
171 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
172 const int len = strlen(shost_states[i].name);
173 if (strncmp(shost_states[i].name, buf, len) == 0 &&
174 buf[len] == '\n') {
175 state = shost_states[i].value;
176 break;
177 }
178 }
179 if (!state)
180 return -EINVAL;
181
182 if (scsi_host_set_state(shost, state))
183 return -EINVAL;
184 return count;
185 }
186
187 static ssize_t
188 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
189 {
190 struct Scsi_Host *shost = class_to_shost(dev);
191 const char *name = scsi_host_state_name(shost->shost_state);
192
193 if (!name)
194 return -EINVAL;
195
196 return snprintf(buf, 20, "%s\n", name);
197 }
198
199 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
200 struct device_attribute dev_attr_hstate =
201 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
202
203 static ssize_t
204 show_shost_mode(unsigned int mode, char *buf)
205 {
206 ssize_t len = 0;
207
208 if (mode & MODE_INITIATOR)
209 len = sprintf(buf, "%s", "Initiator");
210
211 if (mode & MODE_TARGET)
212 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
213
214 len += sprintf(buf + len, "\n");
215
216 return len;
217 }
218
219 static ssize_t
220 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
221 char *buf)
222 {
223 struct Scsi_Host *shost = class_to_shost(dev);
224 unsigned int supported_mode = shost->hostt->supported_mode;
225
226 if (supported_mode == MODE_UNKNOWN)
227 /* by default this should be initiator */
228 supported_mode = MODE_INITIATOR;
229
230 return show_shost_mode(supported_mode, buf);
231 }
232
233 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
234
235 static ssize_t
236 show_shost_active_mode(struct device *dev,
237 struct device_attribute *attr, char *buf)
238 {
239 struct Scsi_Host *shost = class_to_shost(dev);
240
241 if (shost->active_mode == MODE_UNKNOWN)
242 return snprintf(buf, 20, "unknown\n");
243 else
244 return show_shost_mode(shost->active_mode, buf);
245 }
246
247 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
248
249 static int check_reset_type(char *str)
250 {
251 if (strncmp(str, "adapter", 10) == 0)
252 return SCSI_ADAPTER_RESET;
253 else if (strncmp(str, "firmware", 10) == 0)
254 return SCSI_FIRMWARE_RESET;
255 else
256 return 0;
257 }
258
259 static ssize_t
260 store_host_reset(struct device *dev, struct device_attribute *attr,
261 const char *buf, size_t count)
262 {
263 struct Scsi_Host *shost = class_to_shost(dev);
264 struct scsi_host_template *sht = shost->hostt;
265 int ret = -EINVAL;
266 char str[10];
267 int type;
268
269 sscanf(buf, "%s", str);
270 type = check_reset_type(str);
271
272 if (!type)
273 goto exit_store_host_reset;
274
275 if (sht->host_reset)
276 ret = sht->host_reset(shost, type);
277
278 exit_store_host_reset:
279 if (ret == 0)
280 ret = count;
281 return ret;
282 }
283
284 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
285
286 shost_rd_attr(unique_id, "%u\n");
287 shost_rd_attr(host_busy, "%hu\n");
288 shost_rd_attr(cmd_per_lun, "%hd\n");
289 shost_rd_attr(can_queue, "%hd\n");
290 shost_rd_attr(sg_tablesize, "%hu\n");
291 shost_rd_attr(sg_prot_tablesize, "%hu\n");
292 shost_rd_attr(unchecked_isa_dma, "%d\n");
293 shost_rd_attr(prot_capabilities, "%u\n");
294 shost_rd_attr(prot_guard_type, "%hd\n");
295 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
296
297 static struct attribute *scsi_sysfs_shost_attrs[] = {
298 &dev_attr_unique_id.attr,
299 &dev_attr_host_busy.attr,
300 &dev_attr_cmd_per_lun.attr,
301 &dev_attr_can_queue.attr,
302 &dev_attr_sg_tablesize.attr,
303 &dev_attr_sg_prot_tablesize.attr,
304 &dev_attr_unchecked_isa_dma.attr,
305 &dev_attr_proc_name.attr,
306 &dev_attr_scan.attr,
307 &dev_attr_hstate.attr,
308 &dev_attr_supported_mode.attr,
309 &dev_attr_active_mode.attr,
310 &dev_attr_prot_capabilities.attr,
311 &dev_attr_prot_guard_type.attr,
312 &dev_attr_host_reset.attr,
313 NULL
314 };
315
316 struct attribute_group scsi_shost_attr_group = {
317 .attrs = scsi_sysfs_shost_attrs,
318 };
319
320 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
321 &scsi_shost_attr_group,
322 NULL
323 };
324
325 static void scsi_device_cls_release(struct device *class_dev)
326 {
327 struct scsi_device *sdev;
328
329 sdev = class_to_sdev(class_dev);
330 put_device(&sdev->sdev_gendev);
331 }
332
333 static void scsi_device_dev_release_usercontext(struct work_struct *work)
334 {
335 struct scsi_device *sdev;
336 struct device *parent;
337 struct scsi_target *starget;
338 struct list_head *this, *tmp;
339 unsigned long flags;
340
341 sdev = container_of(work, struct scsi_device, ew.work);
342
343 parent = sdev->sdev_gendev.parent;
344 starget = to_scsi_target(parent);
345
346 spin_lock_irqsave(sdev->host->host_lock, flags);
347 starget->reap_ref++;
348 list_del(&sdev->siblings);
349 list_del(&sdev->same_target_siblings);
350 list_del(&sdev->starved_entry);
351 spin_unlock_irqrestore(sdev->host->host_lock, flags);
352
353 cancel_work_sync(&sdev->event_work);
354
355 list_for_each_safe(this, tmp, &sdev->event_list) {
356 struct scsi_event *evt;
357
358 evt = list_entry(this, struct scsi_event, node);
359 list_del(&evt->node);
360 kfree(evt);
361 }
362
363 blk_put_queue(sdev->request_queue);
364 /* NULL queue means the device can't be used */
365 sdev->request_queue = NULL;
366
367 scsi_target_reap(scsi_target(sdev));
368
369 kfree(sdev->inquiry);
370 kfree(sdev);
371
372 if (parent)
373 put_device(parent);
374 }
375
376 static void scsi_device_dev_release(struct device *dev)
377 {
378 struct scsi_device *sdp = to_scsi_device(dev);
379 execute_in_process_context(scsi_device_dev_release_usercontext,
380 &sdp->ew);
381 }
382
383 static struct class sdev_class = {
384 .name = "scsi_device",
385 .dev_release = scsi_device_cls_release,
386 };
387
388 /* all probing is done in the individual ->probe routines */
389 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
390 {
391 struct scsi_device *sdp;
392
393 if (dev->type != &scsi_dev_type)
394 return 0;
395
396 sdp = to_scsi_device(dev);
397 if (sdp->no_uld_attach)
398 return 0;
399 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
400 }
401
402 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
403 {
404 struct scsi_device *sdev;
405
406 if (dev->type != &scsi_dev_type)
407 return 0;
408
409 sdev = to_scsi_device(dev);
410
411 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
412 return 0;
413 }
414
415 struct bus_type scsi_bus_type = {
416 .name = "scsi",
417 .match = scsi_bus_match,
418 .uevent = scsi_bus_uevent,
419 #ifdef CONFIG_PM
420 .pm = &scsi_bus_pm_ops,
421 #endif
422 };
423 EXPORT_SYMBOL_GPL(scsi_bus_type);
424
425 int scsi_sysfs_register(void)
426 {
427 int error;
428
429 error = bus_register(&scsi_bus_type);
430 if (!error) {
431 error = class_register(&sdev_class);
432 if (error)
433 bus_unregister(&scsi_bus_type);
434 }
435
436 return error;
437 }
438
439 void scsi_sysfs_unregister(void)
440 {
441 class_unregister(&sdev_class);
442 bus_unregister(&scsi_bus_type);
443 }
444
445 /*
446 * sdev_show_function: macro to create an attr function that can be used to
447 * show a non-bit field.
448 */
449 #define sdev_show_function(field, format_string) \
450 static ssize_t \
451 sdev_show_##field (struct device *dev, struct device_attribute *attr, \
452 char *buf) \
453 { \
454 struct scsi_device *sdev; \
455 sdev = to_scsi_device(dev); \
456 return snprintf (buf, 20, format_string, sdev->field); \
457 } \
458
459 /*
460 * sdev_rd_attr: macro to create a function and attribute variable for a
461 * read only field.
462 */
463 #define sdev_rd_attr(field, format_string) \
464 sdev_show_function(field, format_string) \
465 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
466
467
468 /*
469 * sdev_rw_attr: create a function and attribute variable for a
470 * read/write field.
471 */
472 #define sdev_rw_attr(field, format_string) \
473 sdev_show_function(field, format_string) \
474 \
475 static ssize_t \
476 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
477 const char *buf, size_t count) \
478 { \
479 struct scsi_device *sdev; \
480 sdev = to_scsi_device(dev); \
481 sscanf (buf, format_string, &sdev->field); \
482 return count; \
483 } \
484 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
485
486 /* Currently we don't export bit fields, but we might in future,
487 * so leave this code in */
488 #if 0
489 /*
490 * sdev_rd_attr: create a function and attribute variable for a
491 * read/write bit field.
492 */
493 #define sdev_rw_attr_bit(field) \
494 sdev_show_function(field, "%d\n") \
495 \
496 static ssize_t \
497 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
498 const char *buf, size_t count) \
499 { \
500 int ret; \
501 struct scsi_device *sdev; \
502 ret = scsi_sdev_check_buf_bit(buf); \
503 if (ret >= 0) { \
504 sdev = to_scsi_device(dev); \
505 sdev->field = ret; \
506 ret = count; \
507 } \
508 return ret; \
509 } \
510 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
511
512 /*
513 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
514 * else return -EINVAL.
515 */
516 static int scsi_sdev_check_buf_bit(const char *buf)
517 {
518 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
519 if (buf[0] == '1')
520 return 1;
521 else if (buf[0] == '0')
522 return 0;
523 else
524 return -EINVAL;
525 } else
526 return -EINVAL;
527 }
528 #endif
529 /*
530 * Create the actual show/store functions and data structures.
531 */
532 sdev_rd_attr (device_blocked, "%d\n");
533 sdev_rd_attr (queue_depth, "%d\n");
534 sdev_rd_attr (type, "%d\n");
535 sdev_rd_attr (scsi_level, "%d\n");
536 sdev_rd_attr (vendor, "%.8s\n");
537 sdev_rd_attr (model, "%.16s\n");
538 sdev_rd_attr (rev, "%.4s\n");
539
540 /*
541 * TODO: can we make these symlinks to the block layer ones?
542 */
543 static ssize_t
544 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
545 {
546 struct scsi_device *sdev;
547 sdev = to_scsi_device(dev);
548 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
549 }
550
551 static ssize_t
552 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
553 const char *buf, size_t count)
554 {
555 struct scsi_device *sdev;
556 int timeout;
557 sdev = to_scsi_device(dev);
558 sscanf (buf, "%d\n", &timeout);
559 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
560 return count;
561 }
562 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
563
564 static ssize_t
565 store_rescan_field (struct device *dev, struct device_attribute *attr,
566 const char *buf, size_t count)
567 {
568 scsi_rescan_device(dev);
569 return count;
570 }
571 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
572
573 static void sdev_store_delete_callback(struct device *dev)
574 {
575 scsi_remove_device(to_scsi_device(dev));
576 }
577
578 static ssize_t
579 sdev_store_delete(struct device *dev, struct device_attribute *attr,
580 const char *buf, size_t count)
581 {
582 int rc;
583
584 /* An attribute cannot be unregistered by one of its own methods,
585 * so we have to use this roundabout approach.
586 */
587 rc = device_schedule_callback(dev, sdev_store_delete_callback);
588 if (rc)
589 count = rc;
590 return count;
591 };
592 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
593
594 static ssize_t
595 store_state_field(struct device *dev, struct device_attribute *attr,
596 const char *buf, size_t count)
597 {
598 int i;
599 struct scsi_device *sdev = to_scsi_device(dev);
600 enum scsi_device_state state = 0;
601
602 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
603 const int len = strlen(sdev_states[i].name);
604 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
605 buf[len] == '\n') {
606 state = sdev_states[i].value;
607 break;
608 }
609 }
610 if (!state)
611 return -EINVAL;
612
613 if (scsi_device_set_state(sdev, state))
614 return -EINVAL;
615 return count;
616 }
617
618 static ssize_t
619 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
620 {
621 struct scsi_device *sdev = to_scsi_device(dev);
622 const char *name = scsi_device_state_name(sdev->sdev_state);
623
624 if (!name)
625 return -EINVAL;
626
627 return snprintf(buf, 20, "%s\n", name);
628 }
629
630 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
631
632 static ssize_t
633 show_queue_type_field(struct device *dev, struct device_attribute *attr,
634 char *buf)
635 {
636 struct scsi_device *sdev = to_scsi_device(dev);
637 const char *name = "none";
638
639 if (sdev->ordered_tags)
640 name = "ordered";
641 else if (sdev->simple_tags)
642 name = "simple";
643
644 return snprintf(buf, 20, "%s\n", name);
645 }
646
647 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
648
649 static ssize_t
650 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
651 {
652 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
653 }
654
655 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
656
657 #define show_sdev_iostat(field) \
658 static ssize_t \
659 show_iostat_##field(struct device *dev, struct device_attribute *attr, \
660 char *buf) \
661 { \
662 struct scsi_device *sdev = to_scsi_device(dev); \
663 unsigned long long count = atomic_read(&sdev->field); \
664 return snprintf(buf, 20, "0x%llx\n", count); \
665 } \
666 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
667
668 show_sdev_iostat(iorequest_cnt);
669 show_sdev_iostat(iodone_cnt);
670 show_sdev_iostat(ioerr_cnt);
671
672 static ssize_t
673 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
674 {
675 struct scsi_device *sdev;
676 sdev = to_scsi_device(dev);
677 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
678 }
679 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
680
681 #define DECLARE_EVT_SHOW(name, Cap_name) \
682 static ssize_t \
683 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
684 char *buf) \
685 { \
686 struct scsi_device *sdev = to_scsi_device(dev); \
687 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
688 return snprintf(buf, 20, "%d\n", val); \
689 }
690
691 #define DECLARE_EVT_STORE(name, Cap_name) \
692 static ssize_t \
693 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
694 const char *buf, size_t count) \
695 { \
696 struct scsi_device *sdev = to_scsi_device(dev); \
697 int val = simple_strtoul(buf, NULL, 0); \
698 if (val == 0) \
699 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
700 else if (val == 1) \
701 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
702 else \
703 return -EINVAL; \
704 return count; \
705 }
706
707 #define DECLARE_EVT(name, Cap_name) \
708 DECLARE_EVT_SHOW(name, Cap_name) \
709 DECLARE_EVT_STORE(name, Cap_name) \
710 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
711 sdev_store_evt_##name);
712 #define REF_EVT(name) &dev_attr_evt_##name.attr
713
714 DECLARE_EVT(media_change, MEDIA_CHANGE)
715
716 /* Default template for device attributes. May NOT be modified */
717 static struct attribute *scsi_sdev_attrs[] = {
718 &dev_attr_device_blocked.attr,
719 &dev_attr_type.attr,
720 &dev_attr_scsi_level.attr,
721 &dev_attr_vendor.attr,
722 &dev_attr_model.attr,
723 &dev_attr_rev.attr,
724 &dev_attr_rescan.attr,
725 &dev_attr_delete.attr,
726 &dev_attr_state.attr,
727 &dev_attr_timeout.attr,
728 &dev_attr_iocounterbits.attr,
729 &dev_attr_iorequest_cnt.attr,
730 &dev_attr_iodone_cnt.attr,
731 &dev_attr_ioerr_cnt.attr,
732 &dev_attr_modalias.attr,
733 REF_EVT(media_change),
734 NULL
735 };
736
737 static struct attribute_group scsi_sdev_attr_group = {
738 .attrs = scsi_sdev_attrs,
739 };
740
741 static const struct attribute_group *scsi_sdev_attr_groups[] = {
742 &scsi_sdev_attr_group,
743 NULL
744 };
745
746 static ssize_t
747 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
748 const char *buf, size_t count)
749 {
750 int depth, retval;
751 struct scsi_device *sdev = to_scsi_device(dev);
752 struct scsi_host_template *sht = sdev->host->hostt;
753
754 if (!sht->change_queue_depth)
755 return -EINVAL;
756
757 depth = simple_strtoul(buf, NULL, 0);
758
759 if (depth < 1)
760 return -EINVAL;
761
762 retval = sht->change_queue_depth(sdev, depth,
763 SCSI_QDEPTH_DEFAULT);
764 if (retval < 0)
765 return retval;
766
767 sdev->max_queue_depth = sdev->queue_depth;
768
769 return count;
770 }
771
772 static struct device_attribute sdev_attr_queue_depth_rw =
773 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
774 sdev_store_queue_depth_rw);
775
776 static ssize_t
777 sdev_show_queue_ramp_up_period(struct device *dev,
778 struct device_attribute *attr,
779 char *buf)
780 {
781 struct scsi_device *sdev;
782 sdev = to_scsi_device(dev);
783 return snprintf(buf, 20, "%u\n",
784 jiffies_to_msecs(sdev->queue_ramp_up_period));
785 }
786
787 static ssize_t
788 sdev_store_queue_ramp_up_period(struct device *dev,
789 struct device_attribute *attr,
790 const char *buf, size_t count)
791 {
792 struct scsi_device *sdev = to_scsi_device(dev);
793 unsigned long period;
794
795 if (strict_strtoul(buf, 10, &period))
796 return -EINVAL;
797
798 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
799 return period;
800 }
801
802 static struct device_attribute sdev_attr_queue_ramp_up_period =
803 __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
804 sdev_show_queue_ramp_up_period,
805 sdev_store_queue_ramp_up_period);
806
807 static ssize_t
808 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
809 const char *buf, size_t count)
810 {
811 struct scsi_device *sdev = to_scsi_device(dev);
812 struct scsi_host_template *sht = sdev->host->hostt;
813 int tag_type = 0, retval;
814 int prev_tag_type = scsi_get_tag_type(sdev);
815
816 if (!sdev->tagged_supported || !sht->change_queue_type)
817 return -EINVAL;
818
819 if (strncmp(buf, "ordered", 7) == 0)
820 tag_type = MSG_ORDERED_TAG;
821 else if (strncmp(buf, "simple", 6) == 0)
822 tag_type = MSG_SIMPLE_TAG;
823 else if (strncmp(buf, "none", 4) != 0)
824 return -EINVAL;
825
826 if (tag_type == prev_tag_type)
827 return count;
828
829 retval = sht->change_queue_type(sdev, tag_type);
830 if (retval < 0)
831 return retval;
832
833 return count;
834 }
835
836 static int scsi_target_add(struct scsi_target *starget)
837 {
838 int error;
839
840 if (starget->state != STARGET_CREATED)
841 return 0;
842
843 error = device_add(&starget->dev);
844 if (error) {
845 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
846 return error;
847 }
848 transport_add_device(&starget->dev);
849 starget->state = STARGET_RUNNING;
850
851 pm_runtime_set_active(&starget->dev);
852 pm_runtime_enable(&starget->dev);
853 device_enable_async_suspend(&starget->dev);
854
855 return 0;
856 }
857
858 static struct device_attribute sdev_attr_queue_type_rw =
859 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
860 sdev_store_queue_type_rw);
861
862 /**
863 * scsi_sysfs_add_sdev - add scsi device to sysfs
864 * @sdev: scsi_device to add
865 *
866 * Return value:
867 * 0 on Success / non-zero on Failure
868 **/
869 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
870 {
871 int error, i;
872 struct request_queue *rq = sdev->request_queue;
873 struct scsi_target *starget = sdev->sdev_target;
874
875 error = scsi_device_set_state(sdev, SDEV_RUNNING);
876 if (error)
877 return error;
878
879 error = scsi_target_add(starget);
880 if (error)
881 return error;
882
883 transport_configure_device(&starget->dev);
884
885 device_enable_async_suspend(&sdev->sdev_gendev);
886 scsi_autopm_get_target(starget);
887 pm_runtime_set_active(&sdev->sdev_gendev);
888 pm_runtime_forbid(&sdev->sdev_gendev);
889 pm_runtime_enable(&sdev->sdev_gendev);
890 scsi_autopm_put_target(starget);
891
892 /* The following call will keep sdev active indefinitely, until
893 * its driver does a corresponding scsi_autopm_pm_device(). Only
894 * drivers supporting autosuspend will do this.
895 */
896 scsi_autopm_get_device(sdev);
897
898 error = device_add(&sdev->sdev_gendev);
899 if (error) {
900 sdev_printk(KERN_INFO, sdev,
901 "failed to add device: %d\n", error);
902 return error;
903 }
904 device_enable_async_suspend(&sdev->sdev_dev);
905 error = device_add(&sdev->sdev_dev);
906 if (error) {
907 sdev_printk(KERN_INFO, sdev,
908 "failed to add class device: %d\n", error);
909 device_del(&sdev->sdev_gendev);
910 return error;
911 }
912 transport_add_device(&sdev->sdev_gendev);
913 sdev->is_visible = 1;
914
915 /* create queue files, which may be writable, depending on the host */
916 if (sdev->host->hostt->change_queue_depth) {
917 error = device_create_file(&sdev->sdev_gendev,
918 &sdev_attr_queue_depth_rw);
919 error = device_create_file(&sdev->sdev_gendev,
920 &sdev_attr_queue_ramp_up_period);
921 }
922 else
923 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
924 if (error)
925 return error;
926
927 if (sdev->host->hostt->change_queue_type)
928 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
929 else
930 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
931 if (error)
932 return error;
933
934 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
935
936 if (error)
937 /* we're treating error on bsg register as non-fatal,
938 * so pretend nothing went wrong */
939 sdev_printk(KERN_INFO, sdev,
940 "Failed to register bsg queue, errno=%d\n", error);
941
942 /* add additional host specific attributes */
943 if (sdev->host->hostt->sdev_attrs) {
944 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
945 error = device_create_file(&sdev->sdev_gendev,
946 sdev->host->hostt->sdev_attrs[i]);
947 if (error)
948 return error;
949 }
950 }
951
952 return error;
953 }
954
955 void __scsi_remove_device(struct scsi_device *sdev)
956 {
957 struct device *dev = &sdev->sdev_gendev;
958
959 if (sdev->is_visible) {
960 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
961 return;
962
963 bsg_unregister_queue(sdev->request_queue);
964 device_unregister(&sdev->sdev_dev);
965 transport_remove_device(dev);
966 device_del(dev);
967 } else
968 put_device(&sdev->sdev_dev);
969 scsi_device_set_state(sdev, SDEV_DEL);
970 if (sdev->host->hostt->slave_destroy)
971 sdev->host->hostt->slave_destroy(sdev);
972 transport_destroy_device(dev);
973
974 /* cause the request function to reject all I/O requests */
975 sdev->request_queue->queuedata = NULL;
976
977 /* Freeing the queue signals to block that we're done */
978 scsi_free_queue(sdev->request_queue);
979 put_device(dev);
980 }
981
982 /**
983 * scsi_remove_device - unregister a device from the scsi bus
984 * @sdev: scsi_device to unregister
985 **/
986 void scsi_remove_device(struct scsi_device *sdev)
987 {
988 struct Scsi_Host *shost = sdev->host;
989
990 mutex_lock(&shost->scan_mutex);
991 __scsi_remove_device(sdev);
992 mutex_unlock(&shost->scan_mutex);
993 }
994 EXPORT_SYMBOL(scsi_remove_device);
995
996 static void __scsi_remove_target(struct scsi_target *starget)
997 {
998 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
999 unsigned long flags;
1000 struct scsi_device *sdev;
1001
1002 spin_lock_irqsave(shost->host_lock, flags);
1003 starget->reap_ref++;
1004 restart:
1005 list_for_each_entry(sdev, &shost->__devices, siblings) {
1006 if (sdev->channel != starget->channel ||
1007 sdev->id != starget->id ||
1008 scsi_device_get(sdev))
1009 continue;
1010 spin_unlock_irqrestore(shost->host_lock, flags);
1011 scsi_remove_device(sdev);
1012 scsi_device_put(sdev);
1013 spin_lock_irqsave(shost->host_lock, flags);
1014 goto restart;
1015 }
1016 spin_unlock_irqrestore(shost->host_lock, flags);
1017 scsi_target_reap(starget);
1018 }
1019
1020 static int __remove_child (struct device * dev, void * data)
1021 {
1022 if (scsi_is_target_device(dev))
1023 __scsi_remove_target(to_scsi_target(dev));
1024 return 0;
1025 }
1026
1027 /**
1028 * scsi_remove_target - try to remove a target and all its devices
1029 * @dev: generic starget or parent of generic stargets to be removed
1030 *
1031 * Note: This is slightly racy. It is possible that if the user
1032 * requests the addition of another device then the target won't be
1033 * removed.
1034 */
1035 void scsi_remove_target(struct device *dev)
1036 {
1037 if (scsi_is_target_device(dev)) {
1038 __scsi_remove_target(to_scsi_target(dev));
1039 return;
1040 }
1041
1042 get_device(dev);
1043 device_for_each_child(dev, NULL, __remove_child);
1044 put_device(dev);
1045 }
1046 EXPORT_SYMBOL(scsi_remove_target);
1047
1048 int scsi_register_driver(struct device_driver *drv)
1049 {
1050 drv->bus = &scsi_bus_type;
1051
1052 return driver_register(drv);
1053 }
1054 EXPORT_SYMBOL(scsi_register_driver);
1055
1056 int scsi_register_interface(struct class_interface *intf)
1057 {
1058 intf->class = &sdev_class;
1059
1060 return class_interface_register(intf);
1061 }
1062 EXPORT_SYMBOL(scsi_register_interface);
1063
1064 /**
1065 * scsi_sysfs_add_host - add scsi host to subsystem
1066 * @shost: scsi host struct to add to subsystem
1067 **/
1068 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1069 {
1070 int error, i;
1071
1072 /* add host specific attributes */
1073 if (shost->hostt->shost_attrs) {
1074 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1075 error = device_create_file(&shost->shost_dev,
1076 shost->hostt->shost_attrs[i]);
1077 if (error)
1078 return error;
1079 }
1080 }
1081
1082 transport_register_device(&shost->shost_gendev);
1083 transport_configure_device(&shost->shost_gendev);
1084 return 0;
1085 }
1086
1087 static struct device_type scsi_dev_type = {
1088 .name = "scsi_device",
1089 .release = scsi_device_dev_release,
1090 .groups = scsi_sdev_attr_groups,
1091 };
1092
1093 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1094 {
1095 unsigned long flags;
1096 struct Scsi_Host *shost = sdev->host;
1097 struct scsi_target *starget = sdev->sdev_target;
1098
1099 device_initialize(&sdev->sdev_gendev);
1100 sdev->sdev_gendev.bus = &scsi_bus_type;
1101 sdev->sdev_gendev.type = &scsi_dev_type;
1102 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1103 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1104
1105 device_initialize(&sdev->sdev_dev);
1106 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1107 sdev->sdev_dev.class = &sdev_class;
1108 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1109 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1110 sdev->scsi_level = starget->scsi_level;
1111 transport_setup_device(&sdev->sdev_gendev);
1112 spin_lock_irqsave(shost->host_lock, flags);
1113 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1114 list_add_tail(&sdev->siblings, &shost->__devices);
1115 spin_unlock_irqrestore(shost->host_lock, flags);
1116 }
1117
1118 int scsi_is_sdev_device(const struct device *dev)
1119 {
1120 return dev->type == &scsi_dev_type;
1121 }
1122 EXPORT_SYMBOL(scsi_is_sdev_device);
1123
1124 /* A blank transport template that is used in drivers that don't
1125 * yet implement Transport Attributes */
1126 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
kernel source for telekom puls (alcatel/mediatek)