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[SCSI] aacraid: fix security weakness
[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/init.h>
11 #include <linux/blkdev.h>
12 #include <linux/device.h>
13
14 #include <scsi/scsi.h>
15 #include <scsi/scsi_device.h>
16 #include <scsi/scsi_host.h>
17 #include <scsi/scsi_tcq.h>
18 #include <scsi/scsi_transport.h>
19 #include <scsi/scsi_driver.h>
20
21 #include "scsi_priv.h"
22 #include "scsi_logging.h"
23
24 static const struct {
25 enum scsi_device_state value;
26 char *name;
27 } sdev_states[] = {
28 { SDEV_CREATED, "created" },
29 { SDEV_RUNNING, "running" },
30 { SDEV_CANCEL, "cancel" },
31 { SDEV_DEL, "deleted" },
32 { SDEV_QUIESCE, "quiesce" },
33 { SDEV_OFFLINE, "offline" },
34 { SDEV_BLOCK, "blocked" },
35 };
36
37 const char *scsi_device_state_name(enum scsi_device_state state)
38 {
39 int i;
40 char *name = NULL;
41
42 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
43 if (sdev_states[i].value == state) {
44 name = sdev_states[i].name;
45 break;
46 }
47 }
48 return name;
49 }
50
51 static const struct {
52 enum scsi_host_state value;
53 char *name;
54 } shost_states[] = {
55 { SHOST_CREATED, "created" },
56 { SHOST_RUNNING, "running" },
57 { SHOST_CANCEL, "cancel" },
58 { SHOST_DEL, "deleted" },
59 { SHOST_RECOVERY, "recovery" },
60 { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
61 { SHOST_DEL_RECOVERY, "deleted/recovery", },
62 };
63 const char *scsi_host_state_name(enum scsi_host_state state)
64 {
65 int i;
66 char *name = NULL;
67
68 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
69 if (shost_states[i].value == state) {
70 name = shost_states[i].name;
71 break;
72 }
73 }
74 return name;
75 }
76
77 static int check_set(unsigned int *val, char *src)
78 {
79 char *last;
80
81 if (strncmp(src, "-", 20) == 0) {
82 *val = SCAN_WILD_CARD;
83 } else {
84 /*
85 * Doesn't check for int overflow
86 */
87 *val = simple_strtoul(src, &last, 0);
88 if (*last != '\0')
89 return 1;
90 }
91 return 0;
92 }
93
94 static int scsi_scan(struct Scsi_Host *shost, const char *str)
95 {
96 char s1[15], s2[15], s3[15], junk;
97 unsigned int channel, id, lun;
98 int res;
99
100 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
101 if (res != 3)
102 return -EINVAL;
103 if (check_set(&channel, s1))
104 return -EINVAL;
105 if (check_set(&id, s2))
106 return -EINVAL;
107 if (check_set(&lun, s3))
108 return -EINVAL;
109 if (shost->transportt->user_scan)
110 res = shost->transportt->user_scan(shost, channel, id, lun);
111 else
112 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
113 return res;
114 }
115
116 /*
117 * shost_show_function: macro to create an attr function that can be used to
118 * show a non-bit field.
119 */
120 #define shost_show_function(name, field, format_string) \
121 static ssize_t \
122 show_##name (struct class_device *class_dev, char *buf) \
123 { \
124 struct Scsi_Host *shost = class_to_shost(class_dev); \
125 return snprintf (buf, 20, format_string, shost->field); \
126 }
127
128 /*
129 * shost_rd_attr: macro to create a function and attribute variable for a
130 * read only field.
131 */
132 #define shost_rd_attr2(name, field, format_string) \
133 shost_show_function(name, field, format_string) \
134 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
135
136 #define shost_rd_attr(field, format_string) \
137 shost_rd_attr2(field, field, format_string)
138
139 /*
140 * Create the actual show/store functions and data structures.
141 */
142
143 static ssize_t store_scan(struct class_device *class_dev, const char *buf,
144 size_t count)
145 {
146 struct Scsi_Host *shost = class_to_shost(class_dev);
147 int res;
148
149 res = scsi_scan(shost, buf);
150 if (res == 0)
151 res = count;
152 return res;
153 };
154 static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
155
156 static ssize_t
157 store_shost_state(struct class_device *class_dev, const char *buf, size_t count)
158 {
159 int i;
160 struct Scsi_Host *shost = class_to_shost(class_dev);
161 enum scsi_host_state state = 0;
162
163 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
164 const int len = strlen(shost_states[i].name);
165 if (strncmp(shost_states[i].name, buf, len) == 0 &&
166 buf[len] == '\n') {
167 state = shost_states[i].value;
168 break;
169 }
170 }
171 if (!state)
172 return -EINVAL;
173
174 if (scsi_host_set_state(shost, state))
175 return -EINVAL;
176 return count;
177 }
178
179 static ssize_t
180 show_shost_state(struct class_device *class_dev, char *buf)
181 {
182 struct Scsi_Host *shost = class_to_shost(class_dev);
183 const char *name = scsi_host_state_name(shost->shost_state);
184
185 if (!name)
186 return -EINVAL;
187
188 return snprintf(buf, 20, "%s\n", name);
189 }
190
191 static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
192
193 static ssize_t
194 show_shost_mode(unsigned int mode, char *buf)
195 {
196 ssize_t len = 0;
197
198 if (mode & MODE_INITIATOR)
199 len = sprintf(buf, "%s", "Initiator");
200
201 if (mode & MODE_TARGET)
202 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
203
204 len += sprintf(buf + len, "\n");
205
206 return len;
207 }
208
209 static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf)
210 {
211 struct Scsi_Host *shost = class_to_shost(class_dev);
212 unsigned int supported_mode = shost->hostt->supported_mode;
213
214 if (supported_mode == MODE_UNKNOWN)
215 /* by default this should be initiator */
216 supported_mode = MODE_INITIATOR;
217
218 return show_shost_mode(supported_mode, buf);
219 }
220
221 static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
222
223 static ssize_t show_shost_active_mode(struct class_device *class_dev, char *buf)
224 {
225 struct Scsi_Host *shost = class_to_shost(class_dev);
226
227 if (shost->active_mode == MODE_UNKNOWN)
228 return snprintf(buf, 20, "unknown\n");
229 else
230 return show_shost_mode(shost->active_mode, buf);
231 }
232
233 static CLASS_DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
234
235 shost_rd_attr(unique_id, "%u\n");
236 shost_rd_attr(host_busy, "%hu\n");
237 shost_rd_attr(cmd_per_lun, "%hd\n");
238 shost_rd_attr(can_queue, "%hd\n");
239 shost_rd_attr(sg_tablesize, "%hu\n");
240 shost_rd_attr(unchecked_isa_dma, "%d\n");
241 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
242
243 static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
244 &class_device_attr_unique_id,
245 &class_device_attr_host_busy,
246 &class_device_attr_cmd_per_lun,
247 &class_device_attr_can_queue,
248 &class_device_attr_sg_tablesize,
249 &class_device_attr_unchecked_isa_dma,
250 &class_device_attr_proc_name,
251 &class_device_attr_scan,
252 &class_device_attr_state,
253 &class_device_attr_supported_mode,
254 &class_device_attr_active_mode,
255 NULL
256 };
257
258 static void scsi_device_cls_release(struct class_device *class_dev)
259 {
260 struct scsi_device *sdev;
261
262 sdev = class_to_sdev(class_dev);
263 put_device(&sdev->sdev_gendev);
264 }
265
266 static void scsi_device_dev_release_usercontext(struct work_struct *work)
267 {
268 struct scsi_device *sdev;
269 struct device *parent;
270 struct scsi_target *starget;
271 struct list_head *this, *tmp;
272 unsigned long flags;
273
274 sdev = container_of(work, struct scsi_device, ew.work);
275
276 parent = sdev->sdev_gendev.parent;
277 starget = to_scsi_target(parent);
278
279 spin_lock_irqsave(sdev->host->host_lock, flags);
280 starget->reap_ref++;
281 list_del(&sdev->siblings);
282 list_del(&sdev->same_target_siblings);
283 list_del(&sdev->starved_entry);
284 spin_unlock_irqrestore(sdev->host->host_lock, flags);
285
286 cancel_work_sync(&sdev->event_work);
287
288 list_for_each_safe(this, tmp, &sdev->event_list) {
289 struct scsi_event *evt;
290
291 evt = list_entry(this, struct scsi_event, node);
292 list_del(&evt->node);
293 kfree(evt);
294 }
295
296 if (sdev->request_queue) {
297 sdev->request_queue->queuedata = NULL;
298 /* user context needed to free queue */
299 scsi_free_queue(sdev->request_queue);
300 /* temporary expedient, try to catch use of queue lock
301 * after free of sdev */
302 sdev->request_queue = NULL;
303 }
304
305 scsi_target_reap(scsi_target(sdev));
306
307 kfree(sdev->inquiry);
308 kfree(sdev);
309
310 if (parent)
311 put_device(parent);
312 }
313
314 static void scsi_device_dev_release(struct device *dev)
315 {
316 struct scsi_device *sdp = to_scsi_device(dev);
317 execute_in_process_context(scsi_device_dev_release_usercontext,
318 &sdp->ew);
319 }
320
321 static struct class sdev_class = {
322 .name = "scsi_device",
323 .release = scsi_device_cls_release,
324 };
325
326 /* all probing is done in the individual ->probe routines */
327 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
328 {
329 struct scsi_device *sdp = to_scsi_device(dev);
330 if (sdp->no_uld_attach)
331 return 0;
332 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
333 }
334
335 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
336 {
337 struct scsi_device *sdev = to_scsi_device(dev);
338
339 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
340 return 0;
341 }
342
343 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
344 {
345 struct device_driver *drv = dev->driver;
346 struct scsi_device *sdev = to_scsi_device(dev);
347 int err;
348
349 err = scsi_device_quiesce(sdev);
350 if (err)
351 return err;
352
353 if (drv && drv->suspend) {
354 err = drv->suspend(dev, state);
355 if (err)
356 return err;
357 }
358
359 return 0;
360 }
361
362 static int scsi_bus_resume(struct device * dev)
363 {
364 struct device_driver *drv = dev->driver;
365 struct scsi_device *sdev = to_scsi_device(dev);
366 int err = 0;
367
368 if (drv && drv->resume)
369 err = drv->resume(dev);
370
371 scsi_device_resume(sdev);
372
373 return err;
374 }
375
376 static int scsi_bus_remove(struct device *dev)
377 {
378 struct device_driver *drv = dev->driver;
379 struct scsi_device *sdev = to_scsi_device(dev);
380 int err = 0;
381
382 /* reset the prep_fn back to the default since the
383 * driver may have altered it and it's being removed */
384 blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
385
386 if (drv && drv->remove)
387 err = drv->remove(dev);
388
389 return 0;
390 }
391
392 struct bus_type scsi_bus_type = {
393 .name = "scsi",
394 .match = scsi_bus_match,
395 .uevent = scsi_bus_uevent,
396 .suspend = scsi_bus_suspend,
397 .resume = scsi_bus_resume,
398 .remove = scsi_bus_remove,
399 };
400
401 int scsi_sysfs_register(void)
402 {
403 int error;
404
405 error = bus_register(&scsi_bus_type);
406 if (!error) {
407 error = class_register(&sdev_class);
408 if (error)
409 bus_unregister(&scsi_bus_type);
410 }
411
412 return error;
413 }
414
415 void scsi_sysfs_unregister(void)
416 {
417 class_unregister(&sdev_class);
418 bus_unregister(&scsi_bus_type);
419 }
420
421 /*
422 * sdev_show_function: macro to create an attr function that can be used to
423 * show a non-bit field.
424 */
425 #define sdev_show_function(field, format_string) \
426 static ssize_t \
427 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \
428 { \
429 struct scsi_device *sdev; \
430 sdev = to_scsi_device(dev); \
431 return snprintf (buf, 20, format_string, sdev->field); \
432 } \
433
434 /*
435 * sdev_rd_attr: macro to create a function and attribute variable for a
436 * read only field.
437 */
438 #define sdev_rd_attr(field, format_string) \
439 sdev_show_function(field, format_string) \
440 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
441
442
443 /*
444 * sdev_rd_attr: create a function and attribute variable for a
445 * read/write field.
446 */
447 #define sdev_rw_attr(field, format_string) \
448 sdev_show_function(field, format_string) \
449 \
450 static ssize_t \
451 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
452 { \
453 struct scsi_device *sdev; \
454 sdev = to_scsi_device(dev); \
455 snscanf (buf, 20, format_string, &sdev->field); \
456 return count; \
457 } \
458 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
459
460 /* Currently we don't export bit fields, but we might in future,
461 * so leave this code in */
462 #if 0
463 /*
464 * sdev_rd_attr: create a function and attribute variable for a
465 * read/write bit field.
466 */
467 #define sdev_rw_attr_bit(field) \
468 sdev_show_function(field, "%d\n") \
469 \
470 static ssize_t \
471 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
472 { \
473 int ret; \
474 struct scsi_device *sdev; \
475 ret = scsi_sdev_check_buf_bit(buf); \
476 if (ret >= 0) { \
477 sdev = to_scsi_device(dev); \
478 sdev->field = ret; \
479 ret = count; \
480 } \
481 return ret; \
482 } \
483 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
484
485 /*
486 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
487 * else return -EINVAL.
488 */
489 static int scsi_sdev_check_buf_bit(const char *buf)
490 {
491 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
492 if (buf[0] == '1')
493 return 1;
494 else if (buf[0] == '0')
495 return 0;
496 else
497 return -EINVAL;
498 } else
499 return -EINVAL;
500 }
501 #endif
502 /*
503 * Create the actual show/store functions and data structures.
504 */
505 sdev_rd_attr (device_blocked, "%d\n");
506 sdev_rd_attr (queue_depth, "%d\n");
507 sdev_rd_attr (type, "%d\n");
508 sdev_rd_attr (scsi_level, "%d\n");
509 sdev_rd_attr (vendor, "%.8s\n");
510 sdev_rd_attr (model, "%.16s\n");
511 sdev_rd_attr (rev, "%.4s\n");
512
513 static ssize_t
514 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
515 {
516 struct scsi_device *sdev;
517 sdev = to_scsi_device(dev);
518 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
519 }
520
521 static ssize_t
522 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
523 {
524 struct scsi_device *sdev;
525 int timeout;
526 sdev = to_scsi_device(dev);
527 sscanf (buf, "%d\n", &timeout);
528 sdev->timeout = timeout * HZ;
529 return count;
530 }
531 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
532
533 static ssize_t
534 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
535 {
536 scsi_rescan_device(dev);
537 return count;
538 }
539 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
540
541 static void sdev_store_delete_callback(struct device *dev)
542 {
543 scsi_remove_device(to_scsi_device(dev));
544 }
545
546 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
547 size_t count)
548 {
549 int rc;
550
551 /* An attribute cannot be unregistered by one of its own methods,
552 * so we have to use this roundabout approach.
553 */
554 rc = device_schedule_callback(dev, sdev_store_delete_callback);
555 if (rc)
556 count = rc;
557 return count;
558 };
559 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
560
561 static ssize_t
562 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
563 {
564 int i;
565 struct scsi_device *sdev = to_scsi_device(dev);
566 enum scsi_device_state state = 0;
567
568 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
569 const int len = strlen(sdev_states[i].name);
570 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
571 buf[len] == '\n') {
572 state = sdev_states[i].value;
573 break;
574 }
575 }
576 if (!state)
577 return -EINVAL;
578
579 if (scsi_device_set_state(sdev, state))
580 return -EINVAL;
581 return count;
582 }
583
584 static ssize_t
585 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
586 {
587 struct scsi_device *sdev = to_scsi_device(dev);
588 const char *name = scsi_device_state_name(sdev->sdev_state);
589
590 if (!name)
591 return -EINVAL;
592
593 return snprintf(buf, 20, "%s\n", name);
594 }
595
596 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
597
598 static ssize_t
599 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
600 {
601 struct scsi_device *sdev = to_scsi_device(dev);
602 const char *name = "none";
603
604 if (sdev->ordered_tags)
605 name = "ordered";
606 else if (sdev->simple_tags)
607 name = "simple";
608
609 return snprintf(buf, 20, "%s\n", name);
610 }
611
612 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
613
614 static ssize_t
615 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
616 {
617 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
618 }
619
620 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
621
622 #define show_sdev_iostat(field) \
623 static ssize_t \
624 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \
625 { \
626 struct scsi_device *sdev = to_scsi_device(dev); \
627 unsigned long long count = atomic_read(&sdev->field); \
628 return snprintf(buf, 20, "0x%llx\n", count); \
629 } \
630 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
631
632 show_sdev_iostat(iorequest_cnt);
633 show_sdev_iostat(iodone_cnt);
634 show_sdev_iostat(ioerr_cnt);
635
636 static ssize_t
637 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
638 {
639 struct scsi_device *sdev;
640 sdev = to_scsi_device(dev);
641 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
642 }
643 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
644
645 #define DECLARE_EVT_SHOW(name, Cap_name) \
646 static ssize_t \
647 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
648 char *buf) \
649 { \
650 struct scsi_device *sdev = to_scsi_device(dev); \
651 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
652 return snprintf(buf, 20, "%d\n", val); \
653 }
654
655 #define DECLARE_EVT_STORE(name, Cap_name) \
656 static ssize_t \
657 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr, \
658 const char *buf, size_t count) \
659 { \
660 struct scsi_device *sdev = to_scsi_device(dev); \
661 int val = simple_strtoul(buf, NULL, 0); \
662 if (val == 0) \
663 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
664 else if (val == 1) \
665 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
666 else \
667 return -EINVAL; \
668 return count; \
669 }
670
671 #define DECLARE_EVT(name, Cap_name) \
672 DECLARE_EVT_SHOW(name, Cap_name) \
673 DECLARE_EVT_STORE(name, Cap_name) \
674 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
675 sdev_store_evt_##name);
676 #define REF_EVT(name) &dev_attr_evt_##name.attr
677
678 DECLARE_EVT(media_change, MEDIA_CHANGE)
679
680 /* Default template for device attributes. May NOT be modified */
681 static struct attribute *scsi_sdev_attrs[] = {
682 &dev_attr_device_blocked.attr,
683 &dev_attr_type.attr,
684 &dev_attr_scsi_level.attr,
685 &dev_attr_vendor.attr,
686 &dev_attr_model.attr,
687 &dev_attr_rev.attr,
688 &dev_attr_rescan.attr,
689 &dev_attr_delete.attr,
690 &dev_attr_state.attr,
691 &dev_attr_timeout.attr,
692 &dev_attr_iocounterbits.attr,
693 &dev_attr_iorequest_cnt.attr,
694 &dev_attr_iodone_cnt.attr,
695 &dev_attr_ioerr_cnt.attr,
696 &dev_attr_modalias.attr,
697 REF_EVT(media_change),
698 NULL
699 };
700
701 static struct attribute_group scsi_sdev_attr_group = {
702 .attrs = scsi_sdev_attrs,
703 };
704
705 static struct attribute_group *scsi_sdev_attr_groups[] = {
706 &scsi_sdev_attr_group,
707 NULL
708 };
709
710 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
711 size_t count)
712 {
713 int depth, retval;
714 struct scsi_device *sdev = to_scsi_device(dev);
715 struct scsi_host_template *sht = sdev->host->hostt;
716
717 if (!sht->change_queue_depth)
718 return -EINVAL;
719
720 depth = simple_strtoul(buf, NULL, 0);
721
722 if (depth < 1)
723 return -EINVAL;
724
725 retval = sht->change_queue_depth(sdev, depth);
726 if (retval < 0)
727 return retval;
728
729 return count;
730 }
731
732 static struct device_attribute sdev_attr_queue_depth_rw =
733 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
734 sdev_store_queue_depth_rw);
735
736 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
737 size_t count)
738 {
739 struct scsi_device *sdev = to_scsi_device(dev);
740 struct scsi_host_template *sht = sdev->host->hostt;
741 int tag_type = 0, retval;
742 int prev_tag_type = scsi_get_tag_type(sdev);
743
744 if (!sdev->tagged_supported || !sht->change_queue_type)
745 return -EINVAL;
746
747 if (strncmp(buf, "ordered", 7) == 0)
748 tag_type = MSG_ORDERED_TAG;
749 else if (strncmp(buf, "simple", 6) == 0)
750 tag_type = MSG_SIMPLE_TAG;
751 else if (strncmp(buf, "none", 4) != 0)
752 return -EINVAL;
753
754 if (tag_type == prev_tag_type)
755 return count;
756
757 retval = sht->change_queue_type(sdev, tag_type);
758 if (retval < 0)
759 return retval;
760
761 return count;
762 }
763
764 static struct device_attribute sdev_attr_queue_type_rw =
765 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
766 sdev_store_queue_type_rw);
767
768 /**
769 * scsi_sysfs_add_sdev - add scsi device to sysfs
770 * @sdev: scsi_device to add
771 *
772 * Return value:
773 * 0 on Success / non-zero on Failure
774 **/
775 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
776 {
777 int error, i;
778 struct request_queue *rq = sdev->request_queue;
779
780 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
781 return error;
782
783 error = device_add(&sdev->sdev_gendev);
784 if (error) {
785 put_device(sdev->sdev_gendev.parent);
786 printk(KERN_INFO "error 1\n");
787 return error;
788 }
789 error = class_device_add(&sdev->sdev_classdev);
790 if (error) {
791 printk(KERN_INFO "error 2\n");
792 goto clean_device;
793 }
794
795 /* take a reference for the sdev_classdev; this is
796 * released by the sdev_class .release */
797 get_device(&sdev->sdev_gendev);
798
799 /* create queue files, which may be writable, depending on the host */
800 if (sdev->host->hostt->change_queue_depth)
801 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
802 else
803 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
804 if (error) {
805 __scsi_remove_device(sdev);
806 goto out;
807 }
808 if (sdev->host->hostt->change_queue_type)
809 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
810 else
811 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
812 if (error) {
813 __scsi_remove_device(sdev);
814 goto out;
815 }
816
817 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
818
819 if (error)
820 sdev_printk(KERN_INFO, sdev,
821 "Failed to register bsg queue, errno=%d\n", error);
822
823 /* we're treating error on bsg register as non-fatal, so pretend
824 * nothing went wrong */
825 error = 0;
826
827 /* add additional host specific attributes */
828 if (sdev->host->hostt->sdev_attrs) {
829 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
830 error = device_create_file(&sdev->sdev_gendev,
831 sdev->host->hostt->sdev_attrs[i]);
832 if (error) {
833 __scsi_remove_device(sdev);
834 goto out;
835 }
836 }
837 }
838
839 transport_add_device(&sdev->sdev_gendev);
840 out:
841 return error;
842
843 clean_device:
844 scsi_device_set_state(sdev, SDEV_CANCEL);
845
846 device_del(&sdev->sdev_gendev);
847 transport_destroy_device(&sdev->sdev_gendev);
848 put_device(&sdev->sdev_gendev);
849
850 return error;
851 }
852
853 void __scsi_remove_device(struct scsi_device *sdev)
854 {
855 struct device *dev = &sdev->sdev_gendev;
856
857 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
858 return;
859
860 bsg_unregister_queue(sdev->request_queue);
861 class_device_unregister(&sdev->sdev_classdev);
862 transport_remove_device(dev);
863 device_del(dev);
864 scsi_device_set_state(sdev, SDEV_DEL);
865 if (sdev->host->hostt->slave_destroy)
866 sdev->host->hostt->slave_destroy(sdev);
867 transport_destroy_device(dev);
868 put_device(dev);
869 }
870
871 /**
872 * scsi_remove_device - unregister a device from the scsi bus
873 * @sdev: scsi_device to unregister
874 **/
875 void scsi_remove_device(struct scsi_device *sdev)
876 {
877 struct Scsi_Host *shost = sdev->host;
878
879 mutex_lock(&shost->scan_mutex);
880 __scsi_remove_device(sdev);
881 mutex_unlock(&shost->scan_mutex);
882 }
883 EXPORT_SYMBOL(scsi_remove_device);
884
885 static void __scsi_remove_target(struct scsi_target *starget)
886 {
887 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
888 unsigned long flags;
889 struct scsi_device *sdev;
890
891 spin_lock_irqsave(shost->host_lock, flags);
892 starget->reap_ref++;
893 restart:
894 list_for_each_entry(sdev, &shost->__devices, siblings) {
895 if (sdev->channel != starget->channel ||
896 sdev->id != starget->id ||
897 sdev->sdev_state == SDEV_DEL)
898 continue;
899 spin_unlock_irqrestore(shost->host_lock, flags);
900 scsi_remove_device(sdev);
901 spin_lock_irqsave(shost->host_lock, flags);
902 goto restart;
903 }
904 spin_unlock_irqrestore(shost->host_lock, flags);
905 scsi_target_reap(starget);
906 }
907
908 static int __remove_child (struct device * dev, void * data)
909 {
910 if (scsi_is_target_device(dev))
911 __scsi_remove_target(to_scsi_target(dev));
912 return 0;
913 }
914
915 /**
916 * scsi_remove_target - try to remove a target and all its devices
917 * @dev: generic starget or parent of generic stargets to be removed
918 *
919 * Note: This is slightly racy. It is possible that if the user
920 * requests the addition of another device then the target won't be
921 * removed.
922 */
923 void scsi_remove_target(struct device *dev)
924 {
925 struct device *rdev;
926
927 if (scsi_is_target_device(dev)) {
928 __scsi_remove_target(to_scsi_target(dev));
929 return;
930 }
931
932 rdev = get_device(dev);
933 device_for_each_child(dev, NULL, __remove_child);
934 put_device(rdev);
935 }
936 EXPORT_SYMBOL(scsi_remove_target);
937
938 int scsi_register_driver(struct device_driver *drv)
939 {
940 drv->bus = &scsi_bus_type;
941
942 return driver_register(drv);
943 }
944 EXPORT_SYMBOL(scsi_register_driver);
945
946 int scsi_register_interface(struct class_interface *intf)
947 {
948 intf->class = &sdev_class;
949
950 return class_interface_register(intf);
951 }
952 EXPORT_SYMBOL(scsi_register_interface);
953
954
955 static struct class_device_attribute *class_attr_overridden(
956 struct class_device_attribute **attrs,
957 struct class_device_attribute *attr)
958 {
959 int i;
960
961 if (!attrs)
962 return NULL;
963 for (i = 0; attrs[i]; i++)
964 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
965 return attrs[i];
966 return NULL;
967 }
968
969 static int class_attr_add(struct class_device *classdev,
970 struct class_device_attribute *attr)
971 {
972 struct class_device_attribute *base_attr;
973
974 /*
975 * Spare the caller from having to copy things it's not interested in.
976 */
977 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
978 if (base_attr) {
979 /* extend permissions */
980 attr->attr.mode |= base_attr->attr.mode;
981
982 /* override null show/store with default */
983 if (!attr->show)
984 attr->show = base_attr->show;
985 if (!attr->store)
986 attr->store = base_attr->store;
987 }
988
989 return class_device_create_file(classdev, attr);
990 }
991
992 /**
993 * scsi_sysfs_add_host - add scsi host to subsystem
994 * @shost: scsi host struct to add to subsystem
995 * @dev: parent struct device pointer
996 **/
997 int scsi_sysfs_add_host(struct Scsi_Host *shost)
998 {
999 int error, i;
1000
1001 if (shost->hostt->shost_attrs) {
1002 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1003 error = class_attr_add(&shost->shost_classdev,
1004 shost->hostt->shost_attrs[i]);
1005 if (error)
1006 return error;
1007 }
1008 }
1009
1010 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
1011 if (!class_attr_overridden(shost->hostt->shost_attrs,
1012 scsi_sysfs_shost_attrs[i])) {
1013 error = class_device_create_file(&shost->shost_classdev,
1014 scsi_sysfs_shost_attrs[i]);
1015 if (error)
1016 return error;
1017 }
1018 }
1019
1020 transport_register_device(&shost->shost_gendev);
1021 transport_configure_device(&shost->shost_gendev);
1022 return 0;
1023 }
1024
1025 static struct device_type scsi_dev_type = {
1026 .name = "scsi_device",
1027 .release = scsi_device_dev_release,
1028 .groups = scsi_sdev_attr_groups,
1029 };
1030
1031 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1032 {
1033 unsigned long flags;
1034 struct Scsi_Host *shost = sdev->host;
1035 struct scsi_target *starget = sdev->sdev_target;
1036
1037 device_initialize(&sdev->sdev_gendev);
1038 sdev->sdev_gendev.bus = &scsi_bus_type;
1039 sdev->sdev_gendev.type = &scsi_dev_type;
1040 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1041 sdev->host->host_no, sdev->channel, sdev->id,
1042 sdev->lun);
1043
1044 class_device_initialize(&sdev->sdev_classdev);
1045 sdev->sdev_classdev.dev = &sdev->sdev_gendev;
1046 sdev->sdev_classdev.class = &sdev_class;
1047 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
1048 "%d:%d:%d:%d", sdev->host->host_no,
1049 sdev->channel, sdev->id, sdev->lun);
1050 sdev->scsi_level = starget->scsi_level;
1051 transport_setup_device(&sdev->sdev_gendev);
1052 spin_lock_irqsave(shost->host_lock, flags);
1053 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1054 list_add_tail(&sdev->siblings, &shost->__devices);
1055 spin_unlock_irqrestore(shost->host_lock, flags);
1056 }
1057
1058 int scsi_is_sdev_device(const struct device *dev)
1059 {
1060 return dev->type == &scsi_dev_type;
1061 }
1062 EXPORT_SYMBOL(scsi_is_sdev_device);
1063
1064 /* A blank transport template that is used in drivers that don't
1065 * yet implement Transport Attributes */
1066 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
kernel source for telekom puls (alcatel/mediatek)