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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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(char *str)
251 {
252 if (strncmp(str, "adapter", 10) == 0)
253 return SCSI_ADAPTER_RESET;
254 else if (strncmp(str, "firmware", 10) == 0)
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 char str[10];
268 int type;
269
270 sscanf(buf, "%s", str);
271 type = check_reset_type(str);
272
273 if (!type)
274 goto exit_store_host_reset;
275
276 if (sht->host_reset)
277 ret = sht->host_reset(shost, type);
278
279 exit_store_host_reset:
280 if (ret == 0)
281 ret = count;
282 return ret;
283 }
284
285 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
286
287 shost_rd_attr(unique_id, "%u\n");
288 shost_rd_attr(host_busy, "%hu\n");
289 shost_rd_attr(cmd_per_lun, "%hd\n");
290 shost_rd_attr(can_queue, "%hd\n");
291 shost_rd_attr(sg_tablesize, "%hu\n");
292 shost_rd_attr(sg_prot_tablesize, "%hu\n");
293 shost_rd_attr(unchecked_isa_dma, "%d\n");
294 shost_rd_attr(prot_capabilities, "%u\n");
295 shost_rd_attr(prot_guard_type, "%hd\n");
296 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
297
298 static struct attribute *scsi_sysfs_shost_attrs[] = {
299 &dev_attr_unique_id.attr,
300 &dev_attr_host_busy.attr,
301 &dev_attr_cmd_per_lun.attr,
302 &dev_attr_can_queue.attr,
303 &dev_attr_sg_tablesize.attr,
304 &dev_attr_sg_prot_tablesize.attr,
305 &dev_attr_unchecked_isa_dma.attr,
306 &dev_attr_proc_name.attr,
307 &dev_attr_scan.attr,
308 &dev_attr_hstate.attr,
309 &dev_attr_supported_mode.attr,
310 &dev_attr_active_mode.attr,
311 &dev_attr_prot_capabilities.attr,
312 &dev_attr_prot_guard_type.attr,
313 &dev_attr_host_reset.attr,
314 NULL
315 };
316
317 struct attribute_group scsi_shost_attr_group = {
318 .attrs = scsi_sysfs_shost_attrs,
319 };
320
321 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
322 &scsi_shost_attr_group,
323 NULL
324 };
325
326 static void scsi_device_cls_release(struct device *class_dev)
327 {
328 struct scsi_device *sdev;
329
330 sdev = class_to_sdev(class_dev);
331 put_device(&sdev->sdev_gendev);
332 }
333
334 static void scsi_device_dev_release_usercontext(struct work_struct *work)
335 {
336 struct scsi_device *sdev;
337 struct device *parent;
338 struct scsi_target *starget;
339 struct list_head *this, *tmp;
340 unsigned long flags;
341
342 sdev = container_of(work, struct scsi_device, ew.work);
343
344 parent = sdev->sdev_gendev.parent;
345 starget = to_scsi_target(parent);
346
347 spin_lock_irqsave(sdev->host->host_lock, flags);
348 starget->reap_ref++;
349 list_del(&sdev->siblings);
350 list_del(&sdev->same_target_siblings);
351 list_del(&sdev->starved_entry);
352 spin_unlock_irqrestore(sdev->host->host_lock, flags);
353
354 cancel_work_sync(&sdev->event_work);
355
356 list_for_each_safe(this, tmp, &sdev->event_list) {
357 struct scsi_event *evt;
358
359 evt = list_entry(this, struct scsi_event, node);
360 list_del(&evt->node);
361 kfree(evt);
362 }
363
364 blk_put_queue(sdev->request_queue);
365 /* NULL queue means the device can't be used */
366 sdev->request_queue = NULL;
367
368 scsi_target_reap(scsi_target(sdev));
369
370 kfree(sdev->inquiry);
371 kfree(sdev);
372
373 if (parent)
374 put_device(parent);
375 }
376
377 static void scsi_device_dev_release(struct device *dev)
378 {
379 struct scsi_device *sdp = to_scsi_device(dev);
380 execute_in_process_context(scsi_device_dev_release_usercontext,
381 &sdp->ew);
382 }
383
384 static struct class sdev_class = {
385 .name = "scsi_device",
386 .dev_release = scsi_device_cls_release,
387 };
388
389 /* all probing is done in the individual ->probe routines */
390 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
391 {
392 struct scsi_device *sdp;
393
394 if (dev->type != &scsi_dev_type)
395 return 0;
396
397 sdp = to_scsi_device(dev);
398 if (sdp->no_uld_attach)
399 return 0;
400 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
401 }
402
403 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
404 {
405 struct scsi_device *sdev;
406
407 if (dev->type != &scsi_dev_type)
408 return 0;
409
410 sdev = to_scsi_device(dev);
411
412 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
413 return 0;
414 }
415
416 struct bus_type scsi_bus_type = {
417 .name = "scsi",
418 .match = scsi_bus_match,
419 .uevent = scsi_bus_uevent,
420 #ifdef CONFIG_PM
421 .pm = &scsi_bus_pm_ops,
422 #endif
423 };
424 EXPORT_SYMBOL_GPL(scsi_bus_type);
425
426 int scsi_sysfs_register(void)
427 {
428 int error;
429
430 error = bus_register(&scsi_bus_type);
431 if (!error) {
432 error = class_register(&sdev_class);
433 if (error)
434 bus_unregister(&scsi_bus_type);
435 }
436
437 return error;
438 }
439
440 void scsi_sysfs_unregister(void)
441 {
442 class_unregister(&sdev_class);
443 bus_unregister(&scsi_bus_type);
444 }
445
446 /*
447 * sdev_show_function: macro to create an attr function that can be used to
448 * show a non-bit field.
449 */
450 #define sdev_show_function(field, format_string) \
451 static ssize_t \
452 sdev_show_##field (struct device *dev, struct device_attribute *attr, \
453 char *buf) \
454 { \
455 struct scsi_device *sdev; \
456 sdev = to_scsi_device(dev); \
457 return snprintf (buf, 20, format_string, sdev->field); \
458 } \
459
460 /*
461 * sdev_rd_attr: macro to create a function and attribute variable for a
462 * read only field.
463 */
464 #define sdev_rd_attr(field, format_string) \
465 sdev_show_function(field, format_string) \
466 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
467
468
469 /*
470 * sdev_rw_attr: create a function and attribute variable for a
471 * read/write field.
472 */
473 #define sdev_rw_attr(field, format_string) \
474 sdev_show_function(field, format_string) \
475 \
476 static ssize_t \
477 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
478 const char *buf, size_t count) \
479 { \
480 struct scsi_device *sdev; \
481 sdev = to_scsi_device(dev); \
482 sscanf (buf, format_string, &sdev->field); \
483 return count; \
484 } \
485 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
486
487 /* Currently we don't export bit fields, but we might in future,
488 * so leave this code in */
489 #if 0
490 /*
491 * sdev_rd_attr: create a function and attribute variable for a
492 * read/write bit field.
493 */
494 #define sdev_rw_attr_bit(field) \
495 sdev_show_function(field, "%d\n") \
496 \
497 static ssize_t \
498 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
499 const char *buf, size_t count) \
500 { \
501 int ret; \
502 struct scsi_device *sdev; \
503 ret = scsi_sdev_check_buf_bit(buf); \
504 if (ret >= 0) { \
505 sdev = to_scsi_device(dev); \
506 sdev->field = ret; \
507 ret = count; \
508 } \
509 return ret; \
510 } \
511 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
512
513 /*
514 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
515 * else return -EINVAL.
516 */
517 static int scsi_sdev_check_buf_bit(const char *buf)
518 {
519 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
520 if (buf[0] == '1')
521 return 1;
522 else if (buf[0] == '0')
523 return 0;
524 else
525 return -EINVAL;
526 } else
527 return -EINVAL;
528 }
529 #endif
530 /*
531 * Create the actual show/store functions and data structures.
532 */
533 sdev_rd_attr (device_blocked, "%d\n");
534 sdev_rd_attr (queue_depth, "%d\n");
535 sdev_rd_attr (type, "%d\n");
536 sdev_rd_attr (scsi_level, "%d\n");
537 sdev_rd_attr (vendor, "%.8s\n");
538 sdev_rd_attr (model, "%.16s\n");
539 sdev_rd_attr (rev, "%.4s\n");
540
541 /*
542 * TODO: can we make these symlinks to the block layer ones?
543 */
544 static ssize_t
545 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
546 {
547 struct scsi_device *sdev;
548 sdev = to_scsi_device(dev);
549 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
550 }
551
552 static ssize_t
553 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
554 const char *buf, size_t count)
555 {
556 struct scsi_device *sdev;
557 int timeout;
558 sdev = to_scsi_device(dev);
559 sscanf (buf, "%d\n", &timeout);
560 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
561 return count;
562 }
563 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
564
565 static ssize_t
566 store_rescan_field (struct device *dev, struct device_attribute *attr,
567 const char *buf, size_t count)
568 {
569 scsi_rescan_device(dev);
570 return count;
571 }
572 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
573
574 static void sdev_store_delete_callback(struct device *dev)
575 {
576 scsi_remove_device(to_scsi_device(dev));
577 }
578
579 static ssize_t
580 sdev_store_delete(struct device *dev, struct device_attribute *attr,
581 const char *buf, size_t count)
582 {
583 int rc;
584
585 /* An attribute cannot be unregistered by one of its own methods,
586 * so we have to use this roundabout approach.
587 */
588 rc = device_schedule_callback(dev, sdev_store_delete_callback);
589 if (rc)
590 count = rc;
591 return count;
592 };
593 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
594
595 static ssize_t
596 store_state_field(struct device *dev, struct device_attribute *attr,
597 const char *buf, size_t count)
598 {
599 int i;
600 struct scsi_device *sdev = to_scsi_device(dev);
601 enum scsi_device_state state = 0;
602
603 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
604 const int len = strlen(sdev_states[i].name);
605 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
606 buf[len] == '\n') {
607 state = sdev_states[i].value;
608 break;
609 }
610 }
611 if (!state)
612 return -EINVAL;
613
614 if (scsi_device_set_state(sdev, state))
615 return -EINVAL;
616 return count;
617 }
618
619 static ssize_t
620 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
621 {
622 struct scsi_device *sdev = to_scsi_device(dev);
623 const char *name = scsi_device_state_name(sdev->sdev_state);
624
625 if (!name)
626 return -EINVAL;
627
628 return snprintf(buf, 20, "%s\n", name);
629 }
630
631 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
632
633 static ssize_t
634 show_queue_type_field(struct device *dev, struct device_attribute *attr,
635 char *buf)
636 {
637 struct scsi_device *sdev = to_scsi_device(dev);
638 const char *name = "none";
639
640 if (sdev->ordered_tags)
641 name = "ordered";
642 else if (sdev->simple_tags)
643 name = "simple";
644
645 return snprintf(buf, 20, "%s\n", name);
646 }
647
648 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
649
650 static ssize_t
651 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
652 {
653 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
654 }
655
656 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
657
658 #define show_sdev_iostat(field) \
659 static ssize_t \
660 show_iostat_##field(struct device *dev, struct device_attribute *attr, \
661 char *buf) \
662 { \
663 struct scsi_device *sdev = to_scsi_device(dev); \
664 unsigned long long count = atomic_read(&sdev->field); \
665 return snprintf(buf, 20, "0x%llx\n", count); \
666 } \
667 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
668
669 show_sdev_iostat(iorequest_cnt);
670 show_sdev_iostat(iodone_cnt);
671 show_sdev_iostat(ioerr_cnt);
672
673 static ssize_t
674 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
675 {
676 struct scsi_device *sdev;
677 sdev = to_scsi_device(dev);
678 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
679 }
680 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
681
682 #define DECLARE_EVT_SHOW(name, Cap_name) \
683 static ssize_t \
684 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
685 char *buf) \
686 { \
687 struct scsi_device *sdev = to_scsi_device(dev); \
688 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
689 return snprintf(buf, 20, "%d\n", val); \
690 }
691
692 #define DECLARE_EVT_STORE(name, Cap_name) \
693 static ssize_t \
694 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
695 const char *buf, size_t count) \
696 { \
697 struct scsi_device *sdev = to_scsi_device(dev); \
698 int val = simple_strtoul(buf, NULL, 0); \
699 if (val == 0) \
700 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
701 else if (val == 1) \
702 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
703 else \
704 return -EINVAL; \
705 return count; \
706 }
707
708 #define DECLARE_EVT(name, Cap_name) \
709 DECLARE_EVT_SHOW(name, Cap_name) \
710 DECLARE_EVT_STORE(name, Cap_name) \
711 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
712 sdev_store_evt_##name);
713 #define REF_EVT(name) &dev_attr_evt_##name.attr
714
715 DECLARE_EVT(media_change, MEDIA_CHANGE)
716
717 /* Default template for device attributes. May NOT be modified */
718 static struct attribute *scsi_sdev_attrs[] = {
719 &dev_attr_device_blocked.attr,
720 &dev_attr_type.attr,
721 &dev_attr_scsi_level.attr,
722 &dev_attr_vendor.attr,
723 &dev_attr_model.attr,
724 &dev_attr_rev.attr,
725 &dev_attr_rescan.attr,
726 &dev_attr_delete.attr,
727 &dev_attr_state.attr,
728 &dev_attr_timeout.attr,
729 &dev_attr_iocounterbits.attr,
730 &dev_attr_iorequest_cnt.attr,
731 &dev_attr_iodone_cnt.attr,
732 &dev_attr_ioerr_cnt.attr,
733 &dev_attr_modalias.attr,
734 REF_EVT(media_change),
735 NULL
736 };
737
738 static struct attribute_group scsi_sdev_attr_group = {
739 .attrs = scsi_sdev_attrs,
740 };
741
742 static const struct attribute_group *scsi_sdev_attr_groups[] = {
743 &scsi_sdev_attr_group,
744 NULL
745 };
746
747 static ssize_t
748 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
749 const char *buf, size_t count)
750 {
751 int depth, retval;
752 struct scsi_device *sdev = to_scsi_device(dev);
753 struct scsi_host_template *sht = sdev->host->hostt;
754
755 if (!sht->change_queue_depth)
756 return -EINVAL;
757
758 depth = simple_strtoul(buf, NULL, 0);
759
760 if (depth < 1)
761 return -EINVAL;
762
763 retval = sht->change_queue_depth(sdev, depth,
764 SCSI_QDEPTH_DEFAULT);
765 if (retval < 0)
766 return retval;
767
768 sdev->max_queue_depth = sdev->queue_depth;
769
770 return count;
771 }
772
773 static struct device_attribute sdev_attr_queue_depth_rw =
774 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
775 sdev_store_queue_depth_rw);
776
777 static ssize_t
778 sdev_show_queue_ramp_up_period(struct device *dev,
779 struct device_attribute *attr,
780 char *buf)
781 {
782 struct scsi_device *sdev;
783 sdev = to_scsi_device(dev);
784 return snprintf(buf, 20, "%u\n",
785 jiffies_to_msecs(sdev->queue_ramp_up_period));
786 }
787
788 static ssize_t
789 sdev_store_queue_ramp_up_period(struct device *dev,
790 struct device_attribute *attr,
791 const char *buf, size_t count)
792 {
793 struct scsi_device *sdev = to_scsi_device(dev);
794 unsigned long period;
795
796 if (strict_strtoul(buf, 10, &period))
797 return -EINVAL;
798
799 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
800 return period;
801 }
802
803 static struct device_attribute sdev_attr_queue_ramp_up_period =
804 __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
805 sdev_show_queue_ramp_up_period,
806 sdev_store_queue_ramp_up_period);
807
808 static ssize_t
809 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
810 const char *buf, size_t count)
811 {
812 struct scsi_device *sdev = to_scsi_device(dev);
813 struct scsi_host_template *sht = sdev->host->hostt;
814 int tag_type = 0, retval;
815 int prev_tag_type = scsi_get_tag_type(sdev);
816
817 if (!sdev->tagged_supported || !sht->change_queue_type)
818 return -EINVAL;
819
820 if (strncmp(buf, "ordered", 7) == 0)
821 tag_type = MSG_ORDERED_TAG;
822 else if (strncmp(buf, "simple", 6) == 0)
823 tag_type = MSG_SIMPLE_TAG;
824 else if (strncmp(buf, "none", 4) != 0)
825 return -EINVAL;
826
827 if (tag_type == prev_tag_type)
828 return count;
829
830 retval = sht->change_queue_type(sdev, tag_type);
831 if (retval < 0)
832 return retval;
833
834 return count;
835 }
836
837 static int scsi_target_add(struct scsi_target *starget)
838 {
839 int error;
840
841 if (starget->state != STARGET_CREATED)
842 return 0;
843
844 error = device_add(&starget->dev);
845 if (error) {
846 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
847 return error;
848 }
849 transport_add_device(&starget->dev);
850 starget->state = STARGET_RUNNING;
851
852 pm_runtime_set_active(&starget->dev);
853 pm_runtime_enable(&starget->dev);
854 device_enable_async_suspend(&starget->dev);
855
856 return 0;
857 }
858
859 static struct device_attribute sdev_attr_queue_type_rw =
860 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
861 sdev_store_queue_type_rw);
862
863 /**
864 * scsi_sysfs_add_sdev - add scsi device to sysfs
865 * @sdev: scsi_device to add
866 *
867 * Return value:
868 * 0 on Success / non-zero on Failure
869 **/
870 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
871 {
872 int error, i;
873 struct request_queue *rq = sdev->request_queue;
874 struct scsi_target *starget = sdev->sdev_target;
875
876 error = scsi_device_set_state(sdev, SDEV_RUNNING);
877 if (error)
878 return error;
879
880 error = scsi_target_add(starget);
881 if (error)
882 return error;
883
884 transport_configure_device(&starget->dev);
885
886 device_enable_async_suspend(&sdev->sdev_gendev);
887 scsi_autopm_get_target(starget);
888 pm_runtime_set_active(&sdev->sdev_gendev);
889 pm_runtime_forbid(&sdev->sdev_gendev);
890 pm_runtime_enable(&sdev->sdev_gendev);
891 scsi_autopm_put_target(starget);
892
893 /* The following call will keep sdev active indefinitely, until
894 * its driver does a corresponding scsi_autopm_pm_device(). Only
895 * drivers supporting autosuspend will do this.
896 */
897 scsi_autopm_get_device(sdev);
898
899 error = device_add(&sdev->sdev_gendev);
900 if (error) {
901 sdev_printk(KERN_INFO, sdev,
902 "failed to add device: %d\n", error);
903 return error;
904 }
905 device_enable_async_suspend(&sdev->sdev_dev);
906 error = device_add(&sdev->sdev_dev);
907 if (error) {
908 sdev_printk(KERN_INFO, sdev,
909 "failed to add class device: %d\n", error);
910 device_del(&sdev->sdev_gendev);
911 return error;
912 }
913 transport_add_device(&sdev->sdev_gendev);
914 sdev->is_visible = 1;
915
916 /* create queue files, which may be writable, depending on the host */
917 if (sdev->host->hostt->change_queue_depth) {
918 error = device_create_file(&sdev->sdev_gendev,
919 &sdev_attr_queue_depth_rw);
920 error = device_create_file(&sdev->sdev_gendev,
921 &sdev_attr_queue_ramp_up_period);
922 }
923 else
924 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
925 if (error)
926 return error;
927
928 if (sdev->host->hostt->change_queue_type)
929 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
930 else
931 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
932 if (error)
933 return error;
934
935 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
936
937 if (error)
938 /* we're treating error on bsg register as non-fatal,
939 * so pretend nothing went wrong */
940 sdev_printk(KERN_INFO, sdev,
941 "Failed to register bsg queue, errno=%d\n", error);
942
943 /* add additional host specific attributes */
944 if (sdev->host->hostt->sdev_attrs) {
945 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
946 error = device_create_file(&sdev->sdev_gendev,
947 sdev->host->hostt->sdev_attrs[i]);
948 if (error)
949 return error;
950 }
951 }
952
953 return error;
954 }
955
956 void __scsi_remove_device(struct scsi_device *sdev)
957 {
958 struct device *dev = &sdev->sdev_gendev;
959
960 if (sdev->is_visible) {
961 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
962 return;
963
964 bsg_unregister_queue(sdev->request_queue);
965 device_unregister(&sdev->sdev_dev);
966 transport_remove_device(dev);
967 device_del(dev);
968 } else
969 put_device(&sdev->sdev_dev);
970
971 /*
972 * Stop accepting new requests and wait until all queuecommand() and
973 * scsi_run_queue() invocations have finished before tearing down the
974 * device.
975 */
976 scsi_device_set_state(sdev, SDEV_DEL);
977 blk_cleanup_queue(sdev->request_queue);
978 cancel_work_sync(&sdev->requeue_work);
979
980 if (sdev->host->hostt->slave_destroy)
981 sdev->host->hostt->slave_destroy(sdev);
982 transport_destroy_device(dev);
983
984 put_device(dev);
985 }
986
987 /**
988 * scsi_remove_device - unregister a device from the scsi bus
989 * @sdev: scsi_device to unregister
990 **/
991 void scsi_remove_device(struct scsi_device *sdev)
992 {
993 struct Scsi_Host *shost = sdev->host;
994
995 mutex_lock(&shost->scan_mutex);
996 __scsi_remove_device(sdev);
997 mutex_unlock(&shost->scan_mutex);
998 }
999 EXPORT_SYMBOL(scsi_remove_device);
1000
1001 static void __scsi_remove_target(struct scsi_target *starget)
1002 {
1003 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1004 unsigned long flags;
1005 struct scsi_device *sdev;
1006
1007 spin_lock_irqsave(shost->host_lock, flags);
1008 restart:
1009 list_for_each_entry(sdev, &shost->__devices, siblings) {
1010 if (sdev->channel != starget->channel ||
1011 sdev->id != starget->id ||
1012 scsi_device_get(sdev))
1013 continue;
1014 spin_unlock_irqrestore(shost->host_lock, flags);
1015 scsi_remove_device(sdev);
1016 scsi_device_put(sdev);
1017 spin_lock_irqsave(shost->host_lock, flags);
1018 goto restart;
1019 }
1020 spin_unlock_irqrestore(shost->host_lock, flags);
1021 }
1022
1023 /**
1024 * scsi_remove_target - try to remove a target and all its devices
1025 * @dev: generic starget or parent of generic stargets to be removed
1026 *
1027 * Note: This is slightly racy. It is possible that if the user
1028 * requests the addition of another device then the target won't be
1029 * removed.
1030 */
1031 void scsi_remove_target(struct device *dev)
1032 {
1033 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1034 struct scsi_target *starget, *found;
1035 unsigned long flags;
1036
1037 restart:
1038 found = NULL;
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 found = starget;
1045 found->reap_ref++;
1046 break;
1047 }
1048 }
1049 spin_unlock_irqrestore(shost->host_lock, flags);
1050
1051 if (found) {
1052 __scsi_remove_target(found);
1053 scsi_target_reap(found);
1054 /* in the case where @dev has multiple starget children,
1055 * continue removing.
1056 *
1057 * FIXME: does such a case exist?
1058 */
1059 goto restart;
1060 }
1061 }
1062 EXPORT_SYMBOL(scsi_remove_target);
1063
1064 int scsi_register_driver(struct device_driver *drv)
1065 {
1066 drv->bus = &scsi_bus_type;
1067
1068 return driver_register(drv);
1069 }
1070 EXPORT_SYMBOL(scsi_register_driver);
1071
1072 int scsi_register_interface(struct class_interface *intf)
1073 {
1074 intf->class = &sdev_class;
1075
1076 return class_interface_register(intf);
1077 }
1078 EXPORT_SYMBOL(scsi_register_interface);
1079
1080 /**
1081 * scsi_sysfs_add_host - add scsi host to subsystem
1082 * @shost: scsi host struct to add to subsystem
1083 **/
1084 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1085 {
1086 int error, i;
1087
1088 /* add host specific attributes */
1089 if (shost->hostt->shost_attrs) {
1090 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1091 error = device_create_file(&shost->shost_dev,
1092 shost->hostt->shost_attrs[i]);
1093 if (error)
1094 return error;
1095 }
1096 }
1097
1098 transport_register_device(&shost->shost_gendev);
1099 transport_configure_device(&shost->shost_gendev);
1100 return 0;
1101 }
1102
1103 static struct device_type scsi_dev_type = {
1104 .name = "scsi_device",
1105 .release = scsi_device_dev_release,
1106 .groups = scsi_sdev_attr_groups,
1107 };
1108
1109 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1110 {
1111 unsigned long flags;
1112 struct Scsi_Host *shost = sdev->host;
1113 struct scsi_target *starget = sdev->sdev_target;
1114
1115 device_initialize(&sdev->sdev_gendev);
1116 sdev->sdev_gendev.bus = &scsi_bus_type;
1117 sdev->sdev_gendev.type = &scsi_dev_type;
1118 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1119 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1120
1121 device_initialize(&sdev->sdev_dev);
1122 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1123 sdev->sdev_dev.class = &sdev_class;
1124 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1125 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1126 sdev->scsi_level = starget->scsi_level;
1127 transport_setup_device(&sdev->sdev_gendev);
1128 spin_lock_irqsave(shost->host_lock, flags);
1129 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1130 list_add_tail(&sdev->siblings, &shost->__devices);
1131 spin_unlock_irqrestore(shost->host_lock, flags);
1132 }
1133
1134 int scsi_is_sdev_device(const struct device *dev)
1135 {
1136 return dev->type == &scsi_dev_type;
1137 }
1138 EXPORT_SYMBOL(scsi_is_sdev_device);
1139
1140 /* A blank transport template that is used in drivers that don't
1141 * yet implement Transport Attributes */
1142 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
Linux kernel - Deliverables
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