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watchdog: s3c2410_wdt: use dev_err()/dev_info() instead of pr_err()/pr_info()
[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 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 scsi_target *starget;
336 struct list_head *this, *tmp;
337 unsigned long flags;
338
339 sdev = container_of(work, struct scsi_device, ew.work);
340
341 parent = sdev->sdev_gendev.parent;
342 starget = to_scsi_target(parent);
343
344 spin_lock_irqsave(sdev->host->host_lock, flags);
345 starget->reap_ref++;
346 list_del(&sdev->siblings);
347 list_del(&sdev->same_target_siblings);
348 list_del(&sdev->starved_entry);
349 spin_unlock_irqrestore(sdev->host->host_lock, flags);
350
351 cancel_work_sync(&sdev->event_work);
352
353 list_for_each_safe(this, tmp, &sdev->event_list) {
354 struct scsi_event *evt;
355
356 evt = list_entry(this, struct scsi_event, node);
357 list_del(&evt->node);
358 kfree(evt);
359 }
360
361 blk_put_queue(sdev->request_queue);
362 /* NULL queue means the device can't be used */
363 sdev->request_queue = NULL;
364
365 scsi_target_reap(scsi_target(sdev));
366
367 kfree(sdev->inquiry);
368 kfree(sdev);
369
370 if (parent)
371 put_device(parent);
372 }
373
374 static void scsi_device_dev_release(struct device *dev)
375 {
376 struct scsi_device *sdp = to_scsi_device(dev);
377 execute_in_process_context(scsi_device_dev_release_usercontext,
378 &sdp->ew);
379 }
380
381 static struct class sdev_class = {
382 .name = "scsi_device",
383 .dev_release = scsi_device_cls_release,
384 };
385
386 /* all probing is done in the individual ->probe routines */
387 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
388 {
389 struct scsi_device *sdp;
390
391 if (dev->type != &scsi_dev_type)
392 return 0;
393
394 sdp = to_scsi_device(dev);
395 if (sdp->no_uld_attach)
396 return 0;
397 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
398 }
399
400 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
401 {
402 struct scsi_device *sdev;
403
404 if (dev->type != &scsi_dev_type)
405 return 0;
406
407 sdev = to_scsi_device(dev);
408
409 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
410 return 0;
411 }
412
413 struct bus_type scsi_bus_type = {
414 .name = "scsi",
415 .match = scsi_bus_match,
416 .uevent = scsi_bus_uevent,
417 #ifdef CONFIG_PM
418 .pm = &scsi_bus_pm_ops,
419 #endif
420 };
421 EXPORT_SYMBOL_GPL(scsi_bus_type);
422
423 int scsi_sysfs_register(void)
424 {
425 int error;
426
427 error = bus_register(&scsi_bus_type);
428 if (!error) {
429 error = class_register(&sdev_class);
430 if (error)
431 bus_unregister(&scsi_bus_type);
432 }
433
434 return error;
435 }
436
437 void scsi_sysfs_unregister(void)
438 {
439 class_unregister(&sdev_class);
440 bus_unregister(&scsi_bus_type);
441 }
442
443 /*
444 * sdev_show_function: macro to create an attr function that can be used to
445 * show a non-bit field.
446 */
447 #define sdev_show_function(field, format_string) \
448 static ssize_t \
449 sdev_show_##field (struct device *dev, struct device_attribute *attr, \
450 char *buf) \
451 { \
452 struct scsi_device *sdev; \
453 sdev = to_scsi_device(dev); \
454 return snprintf (buf, 20, format_string, sdev->field); \
455 } \
456
457 /*
458 * sdev_rd_attr: macro to create a function and attribute variable for a
459 * read only field.
460 */
461 #define sdev_rd_attr(field, format_string) \
462 sdev_show_function(field, format_string) \
463 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
464
465
466 /*
467 * sdev_rw_attr: create a function and attribute variable for a
468 * read/write field.
469 */
470 #define sdev_rw_attr(field, format_string) \
471 sdev_show_function(field, format_string) \
472 \
473 static ssize_t \
474 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
475 const char *buf, size_t count) \
476 { \
477 struct scsi_device *sdev; \
478 sdev = to_scsi_device(dev); \
479 sscanf (buf, format_string, &sdev->field); \
480 return count; \
481 } \
482 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
483
484 /* Currently we don't export bit fields, but we might in future,
485 * so leave this code in */
486 #if 0
487 /*
488 * sdev_rd_attr: create a function and attribute variable for a
489 * read/write bit field.
490 */
491 #define sdev_rw_attr_bit(field) \
492 sdev_show_function(field, "%d\n") \
493 \
494 static ssize_t \
495 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
496 const char *buf, size_t count) \
497 { \
498 int ret; \
499 struct scsi_device *sdev; \
500 ret = scsi_sdev_check_buf_bit(buf); \
501 if (ret >= 0) { \
502 sdev = to_scsi_device(dev); \
503 sdev->field = ret; \
504 ret = count; \
505 } \
506 return ret; \
507 } \
508 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
509
510 /*
511 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
512 * else return -EINVAL.
513 */
514 static int scsi_sdev_check_buf_bit(const char *buf)
515 {
516 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
517 if (buf[0] == '1')
518 return 1;
519 else if (buf[0] == '0')
520 return 0;
521 else
522 return -EINVAL;
523 } else
524 return -EINVAL;
525 }
526 #endif
527 /*
528 * Create the actual show/store functions and data structures.
529 */
530 sdev_rd_attr (device_blocked, "%d\n");
531 sdev_rd_attr (queue_depth, "%d\n");
532 sdev_rd_attr (type, "%d\n");
533 sdev_rd_attr (scsi_level, "%d\n");
534 sdev_rd_attr (vendor, "%.8s\n");
535 sdev_rd_attr (model, "%.16s\n");
536 sdev_rd_attr (rev, "%.4s\n");
537
538 /*
539 * TODO: can we make these symlinks to the block layer ones?
540 */
541 static ssize_t
542 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
543 {
544 struct scsi_device *sdev;
545 sdev = to_scsi_device(dev);
546 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
547 }
548
549 static ssize_t
550 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
551 const char *buf, size_t count)
552 {
553 struct scsi_device *sdev;
554 int timeout;
555 sdev = to_scsi_device(dev);
556 sscanf (buf, "%d\n", &timeout);
557 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
558 return count;
559 }
560 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
561
562 static ssize_t
563 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
564 {
565 struct scsi_device *sdev;
566 sdev = to_scsi_device(dev);
567 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
568 }
569
570 static ssize_t
571 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
572 const char *buf, size_t count)
573 {
574 struct scsi_device *sdev;
575 unsigned int eh_timeout;
576 int err;
577
578 if (!capable(CAP_SYS_ADMIN))
579 return -EACCES;
580
581 sdev = to_scsi_device(dev);
582 err = kstrtouint(buf, 10, &eh_timeout);
583 if (err)
584 return err;
585 sdev->eh_timeout = eh_timeout * HZ;
586
587 return count;
588 }
589 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
590
591 static ssize_t
592 store_rescan_field (struct device *dev, struct device_attribute *attr,
593 const char *buf, size_t count)
594 {
595 scsi_rescan_device(dev);
596 return count;
597 }
598 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
599
600 static void sdev_store_delete_callback(struct device *dev)
601 {
602 scsi_remove_device(to_scsi_device(dev));
603 }
604
605 static ssize_t
606 sdev_store_delete(struct device *dev, struct device_attribute *attr,
607 const char *buf, size_t count)
608 {
609 int rc;
610
611 /* An attribute cannot be unregistered by one of its own methods,
612 * so we have to use this roundabout approach.
613 */
614 rc = device_schedule_callback(dev, sdev_store_delete_callback);
615 if (rc)
616 count = rc;
617 return count;
618 };
619 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
620
621 static ssize_t
622 store_state_field(struct device *dev, struct device_attribute *attr,
623 const char *buf, size_t count)
624 {
625 int i;
626 struct scsi_device *sdev = to_scsi_device(dev);
627 enum scsi_device_state state = 0;
628
629 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
630 const int len = strlen(sdev_states[i].name);
631 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
632 buf[len] == '\n') {
633 state = sdev_states[i].value;
634 break;
635 }
636 }
637 if (!state)
638 return -EINVAL;
639
640 if (scsi_device_set_state(sdev, state))
641 return -EINVAL;
642 return count;
643 }
644
645 static ssize_t
646 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
647 {
648 struct scsi_device *sdev = to_scsi_device(dev);
649 const char *name = scsi_device_state_name(sdev->sdev_state);
650
651 if (!name)
652 return -EINVAL;
653
654 return snprintf(buf, 20, "%s\n", name);
655 }
656
657 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
658
659 static ssize_t
660 show_queue_type_field(struct device *dev, struct device_attribute *attr,
661 char *buf)
662 {
663 struct scsi_device *sdev = to_scsi_device(dev);
664 const char *name = "none";
665
666 if (sdev->ordered_tags)
667 name = "ordered";
668 else if (sdev->simple_tags)
669 name = "simple";
670
671 return snprintf(buf, 20, "%s\n", name);
672 }
673
674 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
675
676 static ssize_t
677 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
678 {
679 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
680 }
681
682 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
683
684 #define show_sdev_iostat(field) \
685 static ssize_t \
686 show_iostat_##field(struct device *dev, struct device_attribute *attr, \
687 char *buf) \
688 { \
689 struct scsi_device *sdev = to_scsi_device(dev); \
690 unsigned long long count = atomic_read(&sdev->field); \
691 return snprintf(buf, 20, "0x%llx\n", count); \
692 } \
693 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
694
695 show_sdev_iostat(iorequest_cnt);
696 show_sdev_iostat(iodone_cnt);
697 show_sdev_iostat(ioerr_cnt);
698
699 static ssize_t
700 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
701 {
702 struct scsi_device *sdev;
703 sdev = to_scsi_device(dev);
704 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
705 }
706 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
707
708 #define DECLARE_EVT_SHOW(name, Cap_name) \
709 static ssize_t \
710 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
711 char *buf) \
712 { \
713 struct scsi_device *sdev = to_scsi_device(dev); \
714 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
715 return snprintf(buf, 20, "%d\n", val); \
716 }
717
718 #define DECLARE_EVT_STORE(name, Cap_name) \
719 static ssize_t \
720 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
721 const char *buf, size_t count) \
722 { \
723 struct scsi_device *sdev = to_scsi_device(dev); \
724 int val = simple_strtoul(buf, NULL, 0); \
725 if (val == 0) \
726 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
727 else if (val == 1) \
728 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
729 else \
730 return -EINVAL; \
731 return count; \
732 }
733
734 #define DECLARE_EVT(name, Cap_name) \
735 DECLARE_EVT_SHOW(name, Cap_name) \
736 DECLARE_EVT_STORE(name, Cap_name) \
737 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
738 sdev_store_evt_##name);
739 #define REF_EVT(name) &dev_attr_evt_##name.attr
740
741 DECLARE_EVT(media_change, MEDIA_CHANGE)
742
743 /* Default template for device attributes. May NOT be modified */
744 static struct attribute *scsi_sdev_attrs[] = {
745 &dev_attr_device_blocked.attr,
746 &dev_attr_type.attr,
747 &dev_attr_scsi_level.attr,
748 &dev_attr_vendor.attr,
749 &dev_attr_model.attr,
750 &dev_attr_rev.attr,
751 &dev_attr_rescan.attr,
752 &dev_attr_delete.attr,
753 &dev_attr_state.attr,
754 &dev_attr_timeout.attr,
755 &dev_attr_eh_timeout.attr,
756 &dev_attr_iocounterbits.attr,
757 &dev_attr_iorequest_cnt.attr,
758 &dev_attr_iodone_cnt.attr,
759 &dev_attr_ioerr_cnt.attr,
760 &dev_attr_modalias.attr,
761 REF_EVT(media_change),
762 NULL
763 };
764
765 static struct attribute_group scsi_sdev_attr_group = {
766 .attrs = scsi_sdev_attrs,
767 };
768
769 static const struct attribute_group *scsi_sdev_attr_groups[] = {
770 &scsi_sdev_attr_group,
771 NULL
772 };
773
774 static ssize_t
775 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
776 const char *buf, size_t count)
777 {
778 int depth, retval;
779 struct scsi_device *sdev = to_scsi_device(dev);
780 struct scsi_host_template *sht = sdev->host->hostt;
781
782 if (!sht->change_queue_depth)
783 return -EINVAL;
784
785 depth = simple_strtoul(buf, NULL, 0);
786
787 if (depth < 1)
788 return -EINVAL;
789
790 retval = sht->change_queue_depth(sdev, depth,
791 SCSI_QDEPTH_DEFAULT);
792 if (retval < 0)
793 return retval;
794
795 sdev->max_queue_depth = sdev->queue_depth;
796
797 return count;
798 }
799
800 static struct device_attribute sdev_attr_queue_depth_rw =
801 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
802 sdev_store_queue_depth_rw);
803
804 static ssize_t
805 sdev_show_queue_ramp_up_period(struct device *dev,
806 struct device_attribute *attr,
807 char *buf)
808 {
809 struct scsi_device *sdev;
810 sdev = to_scsi_device(dev);
811 return snprintf(buf, 20, "%u\n",
812 jiffies_to_msecs(sdev->queue_ramp_up_period));
813 }
814
815 static ssize_t
816 sdev_store_queue_ramp_up_period(struct device *dev,
817 struct device_attribute *attr,
818 const char *buf, size_t count)
819 {
820 struct scsi_device *sdev = to_scsi_device(dev);
821 unsigned long period;
822
823 if (strict_strtoul(buf, 10, &period))
824 return -EINVAL;
825
826 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
827 return period;
828 }
829
830 static struct device_attribute sdev_attr_queue_ramp_up_period =
831 __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
832 sdev_show_queue_ramp_up_period,
833 sdev_store_queue_ramp_up_period);
834
835 static ssize_t
836 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
837 const char *buf, size_t count)
838 {
839 struct scsi_device *sdev = to_scsi_device(dev);
840 struct scsi_host_template *sht = sdev->host->hostt;
841 int tag_type = 0, retval;
842 int prev_tag_type = scsi_get_tag_type(sdev);
843
844 if (!sdev->tagged_supported || !sht->change_queue_type)
845 return -EINVAL;
846
847 if (strncmp(buf, "ordered", 7) == 0)
848 tag_type = MSG_ORDERED_TAG;
849 else if (strncmp(buf, "simple", 6) == 0)
850 tag_type = MSG_SIMPLE_TAG;
851 else if (strncmp(buf, "none", 4) != 0)
852 return -EINVAL;
853
854 if (tag_type == prev_tag_type)
855 return count;
856
857 retval = sht->change_queue_type(sdev, tag_type);
858 if (retval < 0)
859 return retval;
860
861 return count;
862 }
863
864 static int scsi_target_add(struct scsi_target *starget)
865 {
866 int error;
867
868 if (starget->state != STARGET_CREATED)
869 return 0;
870
871 error = device_add(&starget->dev);
872 if (error) {
873 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
874 return error;
875 }
876 transport_add_device(&starget->dev);
877 starget->state = STARGET_RUNNING;
878
879 pm_runtime_set_active(&starget->dev);
880 pm_runtime_enable(&starget->dev);
881 device_enable_async_suspend(&starget->dev);
882
883 return 0;
884 }
885
886 static struct device_attribute sdev_attr_queue_type_rw =
887 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
888 sdev_store_queue_type_rw);
889
890 /**
891 * scsi_sysfs_add_sdev - add scsi device to sysfs
892 * @sdev: scsi_device to add
893 *
894 * Return value:
895 * 0 on Success / non-zero on Failure
896 **/
897 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
898 {
899 int error, i;
900 struct request_queue *rq = sdev->request_queue;
901 struct scsi_target *starget = sdev->sdev_target;
902
903 error = scsi_device_set_state(sdev, SDEV_RUNNING);
904 if (error)
905 return error;
906
907 error = scsi_target_add(starget);
908 if (error)
909 return error;
910
911 transport_configure_device(&starget->dev);
912
913 device_enable_async_suspend(&sdev->sdev_gendev);
914 scsi_autopm_get_target(starget);
915 pm_runtime_set_active(&sdev->sdev_gendev);
916 pm_runtime_forbid(&sdev->sdev_gendev);
917 pm_runtime_enable(&sdev->sdev_gendev);
918 scsi_autopm_put_target(starget);
919
920 /* The following call will keep sdev active indefinitely, until
921 * its driver does a corresponding scsi_autopm_pm_device(). Only
922 * drivers supporting autosuspend will do this.
923 */
924 scsi_autopm_get_device(sdev);
925
926 error = device_add(&sdev->sdev_gendev);
927 if (error) {
928 sdev_printk(KERN_INFO, sdev,
929 "failed to add device: %d\n", error);
930 return error;
931 }
932 device_enable_async_suspend(&sdev->sdev_dev);
933 error = device_add(&sdev->sdev_dev);
934 if (error) {
935 sdev_printk(KERN_INFO, sdev,
936 "failed to add class device: %d\n", error);
937 device_del(&sdev->sdev_gendev);
938 return error;
939 }
940 transport_add_device(&sdev->sdev_gendev);
941 sdev->is_visible = 1;
942
943 /* create queue files, which may be writable, depending on the host */
944 if (sdev->host->hostt->change_queue_depth) {
945 error = device_create_file(&sdev->sdev_gendev,
946 &sdev_attr_queue_depth_rw);
947 error = device_create_file(&sdev->sdev_gendev,
948 &sdev_attr_queue_ramp_up_period);
949 }
950 else
951 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
952 if (error)
953 return error;
954
955 if (sdev->host->hostt->change_queue_type)
956 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
957 else
958 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
959 if (error)
960 return error;
961
962 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
963
964 if (error)
965 /* we're treating error on bsg register as non-fatal,
966 * so pretend nothing went wrong */
967 sdev_printk(KERN_INFO, sdev,
968 "Failed to register bsg queue, errno=%d\n", error);
969
970 /* add additional host specific attributes */
971 if (sdev->host->hostt->sdev_attrs) {
972 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
973 error = device_create_file(&sdev->sdev_gendev,
974 sdev->host->hostt->sdev_attrs[i]);
975 if (error)
976 return error;
977 }
978 }
979
980 return error;
981 }
982
983 void __scsi_remove_device(struct scsi_device *sdev)
984 {
985 struct device *dev = &sdev->sdev_gendev;
986
987 if (sdev->is_visible) {
988 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
989 return;
990
991 bsg_unregister_queue(sdev->request_queue);
992 device_unregister(&sdev->sdev_dev);
993 transport_remove_device(dev);
994 device_del(dev);
995 } else
996 put_device(&sdev->sdev_dev);
997
998 /*
999 * Stop accepting new requests and wait until all queuecommand() and
1000 * scsi_run_queue() invocations have finished before tearing down the
1001 * device.
1002 */
1003 scsi_device_set_state(sdev, SDEV_DEL);
1004 blk_cleanup_queue(sdev->request_queue);
1005 cancel_work_sync(&sdev->requeue_work);
1006
1007 if (sdev->host->hostt->slave_destroy)
1008 sdev->host->hostt->slave_destroy(sdev);
1009 transport_destroy_device(dev);
1010
1011 put_device(dev);
1012 }
1013
1014 /**
1015 * scsi_remove_device - unregister a device from the scsi bus
1016 * @sdev: scsi_device to unregister
1017 **/
1018 void scsi_remove_device(struct scsi_device *sdev)
1019 {
1020 struct Scsi_Host *shost = sdev->host;
1021
1022 mutex_lock(&shost->scan_mutex);
1023 __scsi_remove_device(sdev);
1024 mutex_unlock(&shost->scan_mutex);
1025 }
1026 EXPORT_SYMBOL(scsi_remove_device);
1027
1028 static void __scsi_remove_target(struct scsi_target *starget)
1029 {
1030 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1031 unsigned long flags;
1032 struct scsi_device *sdev;
1033
1034 spin_lock_irqsave(shost->host_lock, flags);
1035 restart:
1036 list_for_each_entry(sdev, &shost->__devices, siblings) {
1037 if (sdev->channel != starget->channel ||
1038 sdev->id != starget->id ||
1039 scsi_device_get(sdev))
1040 continue;
1041 spin_unlock_irqrestore(shost->host_lock, flags);
1042 scsi_remove_device(sdev);
1043 scsi_device_put(sdev);
1044 spin_lock_irqsave(shost->host_lock, flags);
1045 goto restart;
1046 }
1047 spin_unlock_irqrestore(shost->host_lock, flags);
1048 }
1049
1050 /**
1051 * scsi_remove_target - try to remove a target and all its devices
1052 * @dev: generic starget or parent of generic stargets to be removed
1053 *
1054 * Note: This is slightly racy. It is possible that if the user
1055 * requests the addition of another device then the target won't be
1056 * removed.
1057 */
1058 void scsi_remove_target(struct device *dev)
1059 {
1060 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1061 struct scsi_target *starget, *last = NULL;
1062 unsigned long flags;
1063
1064 /* remove targets being careful to lookup next entry before
1065 * deleting the last
1066 */
1067 spin_lock_irqsave(shost->host_lock, flags);
1068 list_for_each_entry(starget, &shost->__targets, siblings) {
1069 if (starget->state == STARGET_DEL)
1070 continue;
1071 if (starget->dev.parent == dev || &starget->dev == dev) {
1072 /* assuming new targets arrive at the end */
1073 starget->reap_ref++;
1074 spin_unlock_irqrestore(shost->host_lock, flags);
1075 if (last)
1076 scsi_target_reap(last);
1077 last = starget;
1078 __scsi_remove_target(starget);
1079 spin_lock_irqsave(shost->host_lock, flags);
1080 }
1081 }
1082 spin_unlock_irqrestore(shost->host_lock, flags);
1083
1084 if (last)
1085 scsi_target_reap(last);
1086 }
1087 EXPORT_SYMBOL(scsi_remove_target);
1088
1089 int scsi_register_driver(struct device_driver *drv)
1090 {
1091 drv->bus = &scsi_bus_type;
1092
1093 return driver_register(drv);
1094 }
1095 EXPORT_SYMBOL(scsi_register_driver);
1096
1097 int scsi_register_interface(struct class_interface *intf)
1098 {
1099 intf->class = &sdev_class;
1100
1101 return class_interface_register(intf);
1102 }
1103 EXPORT_SYMBOL(scsi_register_interface);
1104
1105 /**
1106 * scsi_sysfs_add_host - add scsi host to subsystem
1107 * @shost: scsi host struct to add to subsystem
1108 **/
1109 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1110 {
1111 int error, i;
1112
1113 /* add host specific attributes */
1114 if (shost->hostt->shost_attrs) {
1115 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1116 error = device_create_file(&shost->shost_dev,
1117 shost->hostt->shost_attrs[i]);
1118 if (error)
1119 return error;
1120 }
1121 }
1122
1123 transport_register_device(&shost->shost_gendev);
1124 transport_configure_device(&shost->shost_gendev);
1125 return 0;
1126 }
1127
1128 static struct device_type scsi_dev_type = {
1129 .name = "scsi_device",
1130 .release = scsi_device_dev_release,
1131 .groups = scsi_sdev_attr_groups,
1132 };
1133
1134 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1135 {
1136 unsigned long flags;
1137 struct Scsi_Host *shost = sdev->host;
1138 struct scsi_target *starget = sdev->sdev_target;
1139
1140 device_initialize(&sdev->sdev_gendev);
1141 sdev->sdev_gendev.bus = &scsi_bus_type;
1142 sdev->sdev_gendev.type = &scsi_dev_type;
1143 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1144 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1145
1146 device_initialize(&sdev->sdev_dev);
1147 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1148 sdev->sdev_dev.class = &sdev_class;
1149 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1150 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1151 sdev->scsi_level = starget->scsi_level;
1152 transport_setup_device(&sdev->sdev_gendev);
1153 spin_lock_irqsave(shost->host_lock, flags);
1154 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1155 list_add_tail(&sdev->siblings, &shost->__devices);
1156 spin_unlock_irqrestore(shost->host_lock, flags);
1157 }
1158
1159 int scsi_is_sdev_device(const struct device *dev)
1160 {
1161 return dev->type == &scsi_dev_type;
1162 }
1163 EXPORT_SYMBOL(scsi_is_sdev_device);
1164
1165 /* A blank transport template that is used in drivers that don't
1166 * yet implement Transport Attributes */
1167 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
Linux kernel - Deliverables
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