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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 | |
15 | #include <scsi/scsi.h> |
16 | #include <scsi/scsi_device.h> |
17 | #include <scsi/scsi_host.h> |
18 | #include <scsi/scsi_tcq.h> |
19 | #include <scsi/scsi_transport.h> |
20 | #include <scsi/scsi_driver.h> |
21 | |
22 | #include "scsi_priv.h" |
23 | #include "scsi_logging.h" |
24 | |
25 | static struct device_type scsi_dev_type; |
26 | |
27 | static const struct { |
28 | enum scsi_device_state value; |
29 | char *name; |
30 | } sdev_states[] = { |
31 | { SDEV_CREATED, "created" }, |
32 | { SDEV_RUNNING, "running" }, |
33 | { SDEV_CANCEL, "cancel" }, |
34 | { SDEV_DEL, "deleted" }, |
35 | { SDEV_QUIESCE, "quiesce" }, |
36 | { SDEV_OFFLINE, "offline" }, |
37 | { SDEV_BLOCK, "blocked" }, |
38 | { SDEV_CREATED_BLOCK, "created-blocked" }, |
39 | }; |
40 | |
41 | const char *scsi_device_state_name(enum scsi_device_state state) |
42 | { |
43 | int i; |
44 | char *name = NULL; |
45 | |
46 | for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { |
47 | if (sdev_states[i].value == state) { |
48 | name = sdev_states[i].name; |
49 | break; |
50 | } |
51 | } |
52 | return name; |
53 | } |
54 | |
55 | static const struct { |
56 | enum scsi_host_state value; |
57 | char *name; |
58 | } shost_states[] = { |
59 | { SHOST_CREATED, "created" }, |
60 | { SHOST_RUNNING, "running" }, |
61 | { SHOST_CANCEL, "cancel" }, |
62 | { SHOST_DEL, "deleted" }, |
63 | { SHOST_RECOVERY, "recovery" }, |
64 | { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, |
65 | { SHOST_DEL_RECOVERY, "deleted/recovery", }, |
66 | }; |
67 | const char *scsi_host_state_name(enum scsi_host_state state) |
68 | { |
69 | int i; |
70 | char *name = NULL; |
71 | |
72 | for (i = 0; i < ARRAY_SIZE(shost_states); i++) { |
73 | if (shost_states[i].value == state) { |
74 | name = shost_states[i].name; |
75 | break; |
76 | } |
77 | } |
78 | return name; |
79 | } |
80 | |
81 | static int check_set(unsigned int *val, char *src) |
82 | { |
83 | char *last; |
84 | |
85 | if (strncmp(src, "-", 20) == 0) { |
86 | *val = SCAN_WILD_CARD; |
87 | } else { |
88 | /* |
89 | * Doesn't check for int overflow |
90 | */ |
91 | *val = simple_strtoul(src, &last, 0); |
92 | if (*last != '\0') |
93 | return 1; |
94 | } |
95 | return 0; |
96 | } |
97 | |
98 | static int scsi_scan(struct Scsi_Host *shost, const char *str) |
99 | { |
100 | char s1[15], s2[15], s3[15], junk; |
101 | unsigned int channel, id, lun; |
102 | int res; |
103 | |
104 | res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk); |
105 | if (res != 3) |
106 | return -EINVAL; |
107 | if (check_set(&channel, s1)) |
108 | return -EINVAL; |
109 | if (check_set(&id, s2)) |
110 | return -EINVAL; |
111 | if (check_set(&lun, s3)) |
112 | return -EINVAL; |
113 | if (shost->transportt->user_scan) |
114 | res = shost->transportt->user_scan(shost, channel, id, lun); |
115 | else |
116 | res = scsi_scan_host_selected(shost, channel, id, lun, 1); |
117 | return res; |
118 | } |
119 | |
120 | /* |
121 | * shost_show_function: macro to create an attr function that can be used to |
122 | * show a non-bit field. |
123 | */ |
124 | #define shost_show_function(name, field, format_string) \ |
125 | static ssize_t \ |
126 | show_##name (struct device *dev, struct device_attribute *attr, \ |
127 | char *buf) \ |
128 | { \ |
129 | struct Scsi_Host *shost = class_to_shost(dev); \ |
130 | return snprintf (buf, 20, format_string, shost->field); \ |
131 | } |
132 | |
133 | /* |
134 | * shost_rd_attr: macro to create a function and attribute variable for a |
135 | * read only field. |
136 | */ |
137 | #define shost_rd_attr2(name, field, format_string) \ |
138 | shost_show_function(name, field, format_string) \ |
139 | static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); |
140 | |
141 | #define shost_rd_attr(field, format_string) \ |
142 | shost_rd_attr2(field, field, format_string) |
143 | |
144 | /* |
145 | * Create the actual show/store functions and data structures. |
146 | */ |
147 | |
148 | static ssize_t |
149 | store_scan(struct device *dev, struct device_attribute *attr, |
150 | const char *buf, size_t count) |
151 | { |
152 | struct Scsi_Host *shost = class_to_shost(dev); |
153 | int res; |
154 | |
155 | res = scsi_scan(shost, buf); |
156 | if (res == 0) |
157 | res = count; |
158 | return res; |
159 | }; |
160 | static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); |
161 | |
162 | static ssize_t |
163 | store_shost_state(struct device *dev, struct device_attribute *attr, |
164 | const char *buf, size_t count) |
165 | { |
166 | int i; |
167 | struct Scsi_Host *shost = class_to_shost(dev); |
168 | enum scsi_host_state state = 0; |
169 | |
170 | for (i = 0; i < ARRAY_SIZE(shost_states); i++) { |
171 | const int len = strlen(shost_states[i].name); |
172 | if (strncmp(shost_states[i].name, buf, len) == 0 && |
173 | buf[len] == '\n') { |
174 | state = shost_states[i].value; |
175 | break; |
176 | } |
177 | } |
178 | if (!state) |
179 | return -EINVAL; |
180 | |
181 | if (scsi_host_set_state(shost, state)) |
182 | return -EINVAL; |
183 | return count; |
184 | } |
185 | |
186 | static ssize_t |
187 | show_shost_state(struct device *dev, struct device_attribute *attr, char *buf) |
188 | { |
189 | struct Scsi_Host *shost = class_to_shost(dev); |
190 | const char *name = scsi_host_state_name(shost->shost_state); |
191 | |
192 | if (!name) |
193 | return -EINVAL; |
194 | |
195 | return snprintf(buf, 20, "%s\n", name); |
196 | } |
197 | |
198 | /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */ |
199 | struct device_attribute dev_attr_hstate = |
200 | __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); |
201 | |
202 | static ssize_t |
203 | show_shost_mode(unsigned int mode, char *buf) |
204 | { |
205 | ssize_t len = 0; |
206 | |
207 | if (mode & MODE_INITIATOR) |
208 | len = sprintf(buf, "%s", "Initiator"); |
209 | |
210 | if (mode & MODE_TARGET) |
211 | len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); |
212 | |
213 | len += sprintf(buf + len, "\n"); |
214 | |
215 | return len; |
216 | } |
217 | |
218 | static ssize_t |
219 | show_shost_supported_mode(struct device *dev, struct device_attribute *attr, |
220 | char *buf) |
221 | { |
222 | struct Scsi_Host *shost = class_to_shost(dev); |
223 | unsigned int supported_mode = shost->hostt->supported_mode; |
224 | |
225 | if (supported_mode == MODE_UNKNOWN) |
226 | /* by default this should be initiator */ |
227 | supported_mode = MODE_INITIATOR; |
228 | |
229 | return show_shost_mode(supported_mode, buf); |
230 | } |
231 | |
232 | static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); |
233 | |
234 | static ssize_t |
235 | show_shost_active_mode(struct device *dev, |
236 | struct device_attribute *attr, char *buf) |
237 | { |
238 | struct Scsi_Host *shost = class_to_shost(dev); |
239 | |
240 | if (shost->active_mode == MODE_UNKNOWN) |
241 | return snprintf(buf, 20, "unknown\n"); |
242 | else |
243 | return show_shost_mode(shost->active_mode, buf); |
244 | } |
245 | |
246 | static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); |
247 | |
248 | shost_rd_attr(unique_id, "%u\n"); |
249 | shost_rd_attr(host_busy, "%hu\n"); |
250 | shost_rd_attr(cmd_per_lun, "%hd\n"); |
251 | shost_rd_attr(can_queue, "%hd\n"); |
252 | shost_rd_attr(sg_tablesize, "%hu\n"); |
253 | shost_rd_attr(unchecked_isa_dma, "%d\n"); |
254 | shost_rd_attr(prot_capabilities, "%u\n"); |
255 | shost_rd_attr(prot_guard_type, "%hd\n"); |
256 | shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); |
257 | |
258 | static struct attribute *scsi_sysfs_shost_attrs[] = { |
259 | &dev_attr_unique_id.attr, |
260 | &dev_attr_host_busy.attr, |
261 | &dev_attr_cmd_per_lun.attr, |
262 | &dev_attr_can_queue.attr, |
263 | &dev_attr_sg_tablesize.attr, |
264 | &dev_attr_unchecked_isa_dma.attr, |
265 | &dev_attr_proc_name.attr, |
266 | &dev_attr_scan.attr, |
267 | &dev_attr_hstate.attr, |
268 | &dev_attr_supported_mode.attr, |
269 | &dev_attr_active_mode.attr, |
270 | &dev_attr_prot_capabilities.attr, |
271 | &dev_attr_prot_guard_type.attr, |
272 | NULL |
273 | }; |
274 | |
275 | struct attribute_group scsi_shost_attr_group = { |
276 | .attrs = scsi_sysfs_shost_attrs, |
277 | }; |
278 | |
279 | const struct attribute_group *scsi_sysfs_shost_attr_groups[] = { |
280 | &scsi_shost_attr_group, |
281 | NULL |
282 | }; |
283 | |
284 | static void scsi_device_cls_release(struct device *class_dev) |
285 | { |
286 | struct scsi_device *sdev; |
287 | |
288 | sdev = class_to_sdev(class_dev); |
289 | put_device(&sdev->sdev_gendev); |
290 | } |
291 | |
292 | static void scsi_device_dev_release_usercontext(struct work_struct *work) |
293 | { |
294 | struct scsi_device *sdev; |
295 | struct device *parent; |
296 | struct scsi_target *starget; |
297 | struct list_head *this, *tmp; |
298 | unsigned long flags; |
299 | |
300 | sdev = container_of(work, struct scsi_device, ew.work); |
301 | |
302 | parent = sdev->sdev_gendev.parent; |
303 | starget = to_scsi_target(parent); |
304 | |
305 | spin_lock_irqsave(sdev->host->host_lock, flags); |
306 | starget->reap_ref++; |
307 | list_del(&sdev->siblings); |
308 | list_del(&sdev->same_target_siblings); |
309 | list_del(&sdev->starved_entry); |
310 | spin_unlock_irqrestore(sdev->host->host_lock, flags); |
311 | |
312 | cancel_work_sync(&sdev->event_work); |
313 | |
314 | list_for_each_safe(this, tmp, &sdev->event_list) { |
315 | struct scsi_event *evt; |
316 | |
317 | evt = list_entry(this, struct scsi_event, node); |
318 | list_del(&evt->node); |
319 | kfree(evt); |
320 | } |
321 | |
322 | if (sdev->request_queue) { |
323 | sdev->request_queue->queuedata = NULL; |
324 | /* user context needed to free queue */ |
325 | scsi_free_queue(sdev->request_queue); |
326 | /* temporary expedient, try to catch use of queue lock |
327 | * after free of sdev */ |
328 | sdev->request_queue = NULL; |
329 | } |
330 | |
331 | scsi_target_reap(scsi_target(sdev)); |
332 | |
333 | kfree(sdev->inquiry); |
334 | kfree(sdev); |
335 | |
336 | if (parent) |
337 | put_device(parent); |
338 | } |
339 | |
340 | static void scsi_device_dev_release(struct device *dev) |
341 | { |
342 | struct scsi_device *sdp = to_scsi_device(dev); |
343 | execute_in_process_context(scsi_device_dev_release_usercontext, |
344 | &sdp->ew); |
345 | } |
346 | |
347 | static struct class sdev_class = { |
348 | .name = "scsi_device", |
349 | .dev_release = scsi_device_cls_release, |
350 | }; |
351 | |
352 | /* all probing is done in the individual ->probe routines */ |
353 | static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) |
354 | { |
355 | struct scsi_device *sdp; |
356 | |
357 | if (dev->type != &scsi_dev_type) |
358 | return 0; |
359 | |
360 | sdp = to_scsi_device(dev); |
361 | if (sdp->no_uld_attach) |
362 | return 0; |
363 | return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; |
364 | } |
365 | |
366 | static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) |
367 | { |
368 | struct scsi_device *sdev; |
369 | |
370 | if (dev->type != &scsi_dev_type) |
371 | return 0; |
372 | |
373 | sdev = to_scsi_device(dev); |
374 | |
375 | add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); |
376 | return 0; |
377 | } |
378 | |
379 | static int scsi_bus_suspend(struct device * dev, pm_message_t state) |
380 | { |
381 | struct device_driver *drv; |
382 | struct scsi_device *sdev; |
383 | int err; |
384 | |
385 | if (dev->type != &scsi_dev_type) |
386 | return 0; |
387 | |
388 | drv = dev->driver; |
389 | sdev = to_scsi_device(dev); |
390 | |
391 | err = scsi_device_quiesce(sdev); |
392 | if (err) |
393 | return err; |
394 | |
395 | if (drv && drv->suspend) { |
396 | err = drv->suspend(dev, state); |
397 | if (err) |
398 | return err; |
399 | } |
400 | |
401 | return 0; |
402 | } |
403 | |
404 | static int scsi_bus_resume(struct device * dev) |
405 | { |
406 | struct device_driver *drv; |
407 | struct scsi_device *sdev; |
408 | int err = 0; |
409 | |
410 | if (dev->type != &scsi_dev_type) |
411 | return 0; |
412 | |
413 | drv = dev->driver; |
414 | sdev = to_scsi_device(dev); |
415 | |
416 | if (drv && drv->resume) |
417 | err = drv->resume(dev); |
418 | |
419 | scsi_device_resume(sdev); |
420 | |
421 | return err; |
422 | } |
423 | |
424 | struct bus_type scsi_bus_type = { |
425 | .name = "scsi", |
426 | .match = scsi_bus_match, |
427 | .uevent = scsi_bus_uevent, |
428 | .suspend = scsi_bus_suspend, |
429 | .resume = scsi_bus_resume, |
430 | }; |
431 | EXPORT_SYMBOL_GPL(scsi_bus_type); |
432 | |
433 | int scsi_sysfs_register(void) |
434 | { |
435 | int error; |
436 | |
437 | error = bus_register(&scsi_bus_type); |
438 | if (!error) { |
439 | error = class_register(&sdev_class); |
440 | if (error) |
441 | bus_unregister(&scsi_bus_type); |
442 | } |
443 | |
444 | return error; |
445 | } |
446 | |
447 | void scsi_sysfs_unregister(void) |
448 | { |
449 | class_unregister(&sdev_class); |
450 | bus_unregister(&scsi_bus_type); |
451 | } |
452 | |
453 | /* |
454 | * sdev_show_function: macro to create an attr function that can be used to |
455 | * show a non-bit field. |
456 | */ |
457 | #define sdev_show_function(field, format_string) \ |
458 | static ssize_t \ |
459 | sdev_show_##field (struct device *dev, struct device_attribute *attr, \ |
460 | char *buf) \ |
461 | { \ |
462 | struct scsi_device *sdev; \ |
463 | sdev = to_scsi_device(dev); \ |
464 | return snprintf (buf, 20, format_string, sdev->field); \ |
465 | } \ |
466 | |
467 | /* |
468 | * sdev_rd_attr: macro to create a function and attribute variable for a |
469 | * read only field. |
470 | */ |
471 | #define sdev_rd_attr(field, format_string) \ |
472 | sdev_show_function(field, format_string) \ |
473 | static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); |
474 | |
475 | |
476 | /* |
477 | * sdev_rd_attr: create a function and attribute variable for a |
478 | * read/write field. |
479 | */ |
480 | #define sdev_rw_attr(field, format_string) \ |
481 | sdev_show_function(field, format_string) \ |
482 | \ |
483 | static ssize_t \ |
484 | sdev_store_##field (struct device *dev, struct device_attribute *attr, \ |
485 | const char *buf, size_t count) \ |
486 | { \ |
487 | struct scsi_device *sdev; \ |
488 | sdev = to_scsi_device(dev); \ |
489 | snscanf (buf, 20, format_string, &sdev->field); \ |
490 | return count; \ |
491 | } \ |
492 | static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); |
493 | |
494 | /* Currently we don't export bit fields, but we might in future, |
495 | * so leave this code in */ |
496 | #if 0 |
497 | /* |
498 | * sdev_rd_attr: create a function and attribute variable for a |
499 | * read/write bit field. |
500 | */ |
501 | #define sdev_rw_attr_bit(field) \ |
502 | sdev_show_function(field, "%d\n") \ |
503 | \ |
504 | static ssize_t \ |
505 | sdev_store_##field (struct device *dev, struct device_attribute *attr, \ |
506 | const char *buf, size_t count) \ |
507 | { \ |
508 | int ret; \ |
509 | struct scsi_device *sdev; \ |
510 | ret = scsi_sdev_check_buf_bit(buf); \ |
511 | if (ret >= 0) { \ |
512 | sdev = to_scsi_device(dev); \ |
513 | sdev->field = ret; \ |
514 | ret = count; \ |
515 | } \ |
516 | return ret; \ |
517 | } \ |
518 | static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); |
519 | |
520 | /* |
521 | * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", |
522 | * else return -EINVAL. |
523 | */ |
524 | static int scsi_sdev_check_buf_bit(const char *buf) |
525 | { |
526 | if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { |
527 | if (buf[0] == '1') |
528 | return 1; |
529 | else if (buf[0] == '0') |
530 | return 0; |
531 | else |
532 | return -EINVAL; |
533 | } else |
534 | return -EINVAL; |
535 | } |
536 | #endif |
537 | /* |
538 | * Create the actual show/store functions and data structures. |
539 | */ |
540 | sdev_rd_attr (device_blocked, "%d\n"); |
541 | sdev_rd_attr (queue_depth, "%d\n"); |
542 | sdev_rd_attr (type, "%d\n"); |
543 | sdev_rd_attr (scsi_level, "%d\n"); |
544 | sdev_rd_attr (vendor, "%.8s\n"); |
545 | sdev_rd_attr (model, "%.16s\n"); |
546 | sdev_rd_attr (rev, "%.4s\n"); |
547 | |
548 | /* |
549 | * TODO: can we make these symlinks to the block layer ones? |
550 | */ |
551 | static ssize_t |
552 | sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) |
553 | { |
554 | struct scsi_device *sdev; |
555 | sdev = to_scsi_device(dev); |
556 | return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ); |
557 | } |
558 | |
559 | static ssize_t |
560 | sdev_store_timeout (struct device *dev, struct device_attribute *attr, |
561 | const char *buf, size_t count) |
562 | { |
563 | struct scsi_device *sdev; |
564 | int timeout; |
565 | sdev = to_scsi_device(dev); |
566 | sscanf (buf, "%d\n", &timeout); |
567 | blk_queue_rq_timeout(sdev->request_queue, timeout * HZ); |
568 | return count; |
569 | } |
570 | static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); |
571 | |
572 | static ssize_t |
573 | store_rescan_field (struct device *dev, struct device_attribute *attr, |
574 | const char *buf, size_t count) |
575 | { |
576 | scsi_rescan_device(dev); |
577 | return count; |
578 | } |
579 | static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); |
580 | |
581 | static void sdev_store_delete_callback(struct device *dev) |
582 | { |
583 | scsi_remove_device(to_scsi_device(dev)); |
584 | } |
585 | |
586 | static ssize_t |
587 | sdev_store_delete(struct device *dev, struct device_attribute *attr, |
588 | const char *buf, size_t count) |
589 | { |
590 | int rc; |
591 | |
592 | /* An attribute cannot be unregistered by one of its own methods, |
593 | * so we have to use this roundabout approach. |
594 | */ |
595 | rc = device_schedule_callback(dev, sdev_store_delete_callback); |
596 | if (rc) |
597 | count = rc; |
598 | return count; |
599 | }; |
600 | static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); |
601 | |
602 | static ssize_t |
603 | store_state_field(struct device *dev, struct device_attribute *attr, |
604 | const char *buf, size_t count) |
605 | { |
606 | int i; |
607 | struct scsi_device *sdev = to_scsi_device(dev); |
608 | enum scsi_device_state state = 0; |
609 | |
610 | for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { |
611 | const int len = strlen(sdev_states[i].name); |
612 | if (strncmp(sdev_states[i].name, buf, len) == 0 && |
613 | buf[len] == '\n') { |
614 | state = sdev_states[i].value; |
615 | break; |
616 | } |
617 | } |
618 | if (!state) |
619 | return -EINVAL; |
620 | |
621 | if (scsi_device_set_state(sdev, state)) |
622 | return -EINVAL; |
623 | return count; |
624 | } |
625 | |
626 | static ssize_t |
627 | show_state_field(struct device *dev, struct device_attribute *attr, char *buf) |
628 | { |
629 | struct scsi_device *sdev = to_scsi_device(dev); |
630 | const char *name = scsi_device_state_name(sdev->sdev_state); |
631 | |
632 | if (!name) |
633 | return -EINVAL; |
634 | |
635 | return snprintf(buf, 20, "%s\n", name); |
636 | } |
637 | |
638 | static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); |
639 | |
640 | static ssize_t |
641 | show_queue_type_field(struct device *dev, struct device_attribute *attr, |
642 | char *buf) |
643 | { |
644 | struct scsi_device *sdev = to_scsi_device(dev); |
645 | const char *name = "none"; |
646 | |
647 | if (sdev->ordered_tags) |
648 | name = "ordered"; |
649 | else if (sdev->simple_tags) |
650 | name = "simple"; |
651 | |
652 | return snprintf(buf, 20, "%s\n", name); |
653 | } |
654 | |
655 | static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); |
656 | |
657 | static ssize_t |
658 | show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) |
659 | { |
660 | return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); |
661 | } |
662 | |
663 | static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); |
664 | |
665 | #define show_sdev_iostat(field) \ |
666 | static ssize_t \ |
667 | show_iostat_##field(struct device *dev, struct device_attribute *attr, \ |
668 | char *buf) \ |
669 | { \ |
670 | struct scsi_device *sdev = to_scsi_device(dev); \ |
671 | unsigned long long count = atomic_read(&sdev->field); \ |
672 | return snprintf(buf, 20, "0x%llx\n", count); \ |
673 | } \ |
674 | static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) |
675 | |
676 | show_sdev_iostat(iorequest_cnt); |
677 | show_sdev_iostat(iodone_cnt); |
678 | show_sdev_iostat(ioerr_cnt); |
679 | |
680 | static ssize_t |
681 | sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
682 | { |
683 | struct scsi_device *sdev; |
684 | sdev = to_scsi_device(dev); |
685 | return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); |
686 | } |
687 | static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); |
688 | |
689 | #define DECLARE_EVT_SHOW(name, Cap_name) \ |
690 | static ssize_t \ |
691 | sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ |
692 | char *buf) \ |
693 | { \ |
694 | struct scsi_device *sdev = to_scsi_device(dev); \ |
695 | int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ |
696 | return snprintf(buf, 20, "%d\n", val); \ |
697 | } |
698 | |
699 | #define DECLARE_EVT_STORE(name, Cap_name) \ |
700 | static ssize_t \ |
701 | sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ |
702 | const char *buf, size_t count) \ |
703 | { \ |
704 | struct scsi_device *sdev = to_scsi_device(dev); \ |
705 | int val = simple_strtoul(buf, NULL, 0); \ |
706 | if (val == 0) \ |
707 | clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ |
708 | else if (val == 1) \ |
709 | set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ |
710 | else \ |
711 | return -EINVAL; \ |
712 | return count; \ |
713 | } |
714 | |
715 | #define DECLARE_EVT(name, Cap_name) \ |
716 | DECLARE_EVT_SHOW(name, Cap_name) \ |
717 | DECLARE_EVT_STORE(name, Cap_name) \ |
718 | static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ |
719 | sdev_store_evt_##name); |
720 | #define REF_EVT(name) &dev_attr_evt_##name.attr |
721 | |
722 | DECLARE_EVT(media_change, MEDIA_CHANGE) |
723 | |
724 | /* Default template for device attributes. May NOT be modified */ |
725 | static struct attribute *scsi_sdev_attrs[] = { |
726 | &dev_attr_device_blocked.attr, |
727 | &dev_attr_type.attr, |
728 | &dev_attr_scsi_level.attr, |
729 | &dev_attr_vendor.attr, |
730 | &dev_attr_model.attr, |
731 | &dev_attr_rev.attr, |
732 | &dev_attr_rescan.attr, |
733 | &dev_attr_delete.attr, |
734 | &dev_attr_state.attr, |
735 | &dev_attr_timeout.attr, |
736 | &dev_attr_iocounterbits.attr, |
737 | &dev_attr_iorequest_cnt.attr, |
738 | &dev_attr_iodone_cnt.attr, |
739 | &dev_attr_ioerr_cnt.attr, |
740 | &dev_attr_modalias.attr, |
741 | REF_EVT(media_change), |
742 | NULL |
743 | }; |
744 | |
745 | static struct attribute_group scsi_sdev_attr_group = { |
746 | .attrs = scsi_sdev_attrs, |
747 | }; |
748 | |
749 | static const struct attribute_group *scsi_sdev_attr_groups[] = { |
750 | &scsi_sdev_attr_group, |
751 | NULL |
752 | }; |
753 | |
754 | static ssize_t |
755 | sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, |
756 | const char *buf, size_t count) |
757 | { |
758 | int depth, retval; |
759 | struct scsi_device *sdev = to_scsi_device(dev); |
760 | struct scsi_host_template *sht = sdev->host->hostt; |
761 | |
762 | if (!sht->change_queue_depth) |
763 | return -EINVAL; |
764 | |
765 | depth = simple_strtoul(buf, NULL, 0); |
766 | |
767 | if (depth < 1) |
768 | return -EINVAL; |
769 | |
770 | retval = sht->change_queue_depth(sdev, depth, |
771 | SCSI_QDEPTH_DEFAULT); |
772 | if (retval < 0) |
773 | return retval; |
774 | |
775 | sdev->max_queue_depth = sdev->queue_depth; |
776 | |
777 | return count; |
778 | } |
779 | |
780 | static struct device_attribute sdev_attr_queue_depth_rw = |
781 | __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, |
782 | sdev_store_queue_depth_rw); |
783 | |
784 | static ssize_t |
785 | sdev_show_queue_ramp_up_period(struct device *dev, |
786 | struct device_attribute *attr, |
787 | char *buf) |
788 | { |
789 | struct scsi_device *sdev; |
790 | sdev = to_scsi_device(dev); |
791 | return snprintf(buf, 20, "%u\n", |
792 | jiffies_to_msecs(sdev->queue_ramp_up_period)); |
793 | } |
794 | |
795 | static ssize_t |
796 | sdev_store_queue_ramp_up_period(struct device *dev, |
797 | struct device_attribute *attr, |
798 | const char *buf, size_t count) |
799 | { |
800 | struct scsi_device *sdev = to_scsi_device(dev); |
801 | unsigned long period; |
802 | |
803 | if (strict_strtoul(buf, 10, &period)) |
804 | return -EINVAL; |
805 | |
806 | sdev->queue_ramp_up_period = msecs_to_jiffies(period); |
807 | return period; |
808 | } |
809 | |
810 | static struct device_attribute sdev_attr_queue_ramp_up_period = |
811 | __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR, |
812 | sdev_show_queue_ramp_up_period, |
813 | sdev_store_queue_ramp_up_period); |
814 | |
815 | static ssize_t |
816 | sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, |
817 | const char *buf, size_t count) |
818 | { |
819 | struct scsi_device *sdev = to_scsi_device(dev); |
820 | struct scsi_host_template *sht = sdev->host->hostt; |
821 | int tag_type = 0, retval; |
822 | int prev_tag_type = scsi_get_tag_type(sdev); |
823 | |
824 | if (!sdev->tagged_supported || !sht->change_queue_type) |
825 | return -EINVAL; |
826 | |
827 | if (strncmp(buf, "ordered", 7) == 0) |
828 | tag_type = MSG_ORDERED_TAG; |
829 | else if (strncmp(buf, "simple", 6) == 0) |
830 | tag_type = MSG_SIMPLE_TAG; |
831 | else if (strncmp(buf, "none", 4) != 0) |
832 | return -EINVAL; |
833 | |
834 | if (tag_type == prev_tag_type) |
835 | return count; |
836 | |
837 | retval = sht->change_queue_type(sdev, tag_type); |
838 | if (retval < 0) |
839 | return retval; |
840 | |
841 | return count; |
842 | } |
843 | |
844 | static int scsi_target_add(struct scsi_target *starget) |
845 | { |
846 | int error; |
847 | |
848 | if (starget->state != STARGET_CREATED) |
849 | return 0; |
850 | |
851 | device_enable_async_suspend(&starget->dev); |
852 | |
853 | error = device_add(&starget->dev); |
854 | if (error) { |
855 | dev_err(&starget->dev, "target device_add failed, error %d\n", error); |
856 | get_device(&starget->dev); |
857 | scsi_target_reap(starget); |
858 | put_device(&starget->dev); |
859 | return error; |
860 | } |
861 | transport_add_device(&starget->dev); |
862 | starget->state = STARGET_RUNNING; |
863 | |
864 | return 0; |
865 | } |
866 | |
867 | static struct device_attribute sdev_attr_queue_type_rw = |
868 | __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, |
869 | sdev_store_queue_type_rw); |
870 | |
871 | /** |
872 | * scsi_sysfs_add_sdev - add scsi device to sysfs |
873 | * @sdev: scsi_device to add |
874 | * |
875 | * Return value: |
876 | * 0 on Success / non-zero on Failure |
877 | **/ |
878 | int scsi_sysfs_add_sdev(struct scsi_device *sdev) |
879 | { |
880 | int error, i; |
881 | struct request_queue *rq = sdev->request_queue; |
882 | struct scsi_target *starget = sdev->sdev_target; |
883 | |
884 | error = scsi_device_set_state(sdev, SDEV_RUNNING); |
885 | if (error) |
886 | return error; |
887 | |
888 | error = scsi_target_add(starget); |
889 | if (error) |
890 | return error; |
891 | |
892 | transport_configure_device(&starget->dev); |
893 | device_enable_async_suspend(&sdev->sdev_gendev); |
894 | error = device_add(&sdev->sdev_gendev); |
895 | if (error) { |
896 | printk(KERN_INFO "error 1\n"); |
897 | return error; |
898 | } |
899 | device_enable_async_suspend(&sdev->sdev_dev); |
900 | error = device_add(&sdev->sdev_dev); |
901 | if (error) { |
902 | printk(KERN_INFO "error 2\n"); |
903 | device_del(&sdev->sdev_gendev); |
904 | return error; |
905 | } |
906 | transport_add_device(&sdev->sdev_gendev); |
907 | sdev->is_visible = 1; |
908 | |
909 | /* create queue files, which may be writable, depending on the host */ |
910 | if (sdev->host->hostt->change_queue_depth) { |
911 | error = device_create_file(&sdev->sdev_gendev, |
912 | &sdev_attr_queue_depth_rw); |
913 | error = device_create_file(&sdev->sdev_gendev, |
914 | &sdev_attr_queue_ramp_up_period); |
915 | } |
916 | else |
917 | error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth); |
918 | if (error) |
919 | return error; |
920 | |
921 | if (sdev->host->hostt->change_queue_type) |
922 | error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw); |
923 | else |
924 | error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type); |
925 | if (error) |
926 | return error; |
927 | |
928 | error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL); |
929 | |
930 | if (error) |
931 | /* we're treating error on bsg register as non-fatal, |
932 | * so pretend nothing went wrong */ |
933 | sdev_printk(KERN_INFO, sdev, |
934 | "Failed to register bsg queue, errno=%d\n", error); |
935 | |
936 | /* add additional host specific attributes */ |
937 | if (sdev->host->hostt->sdev_attrs) { |
938 | for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { |
939 | error = device_create_file(&sdev->sdev_gendev, |
940 | sdev->host->hostt->sdev_attrs[i]); |
941 | if (error) |
942 | return error; |
943 | } |
944 | } |
945 | |
946 | return error; |
947 | } |
948 | |
949 | void __scsi_remove_device(struct scsi_device *sdev) |
950 | { |
951 | struct device *dev = &sdev->sdev_gendev; |
952 | |
953 | if (sdev->is_visible) { |
954 | if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) |
955 | return; |
956 | |
957 | bsg_unregister_queue(sdev->request_queue); |
958 | device_unregister(&sdev->sdev_dev); |
959 | transport_remove_device(dev); |
960 | device_del(dev); |
961 | } else |
962 | put_device(&sdev->sdev_dev); |
963 | scsi_device_set_state(sdev, SDEV_DEL); |
964 | if (sdev->host->hostt->slave_destroy) |
965 | sdev->host->hostt->slave_destroy(sdev); |
966 | transport_destroy_device(dev); |
967 | put_device(dev); |
968 | } |
969 | |
970 | /** |
971 | * scsi_remove_device - unregister a device from the scsi bus |
972 | * @sdev: scsi_device to unregister |
973 | **/ |
974 | void scsi_remove_device(struct scsi_device *sdev) |
975 | { |
976 | struct Scsi_Host *shost = sdev->host; |
977 | |
978 | mutex_lock(&shost->scan_mutex); |
979 | __scsi_remove_device(sdev); |
980 | mutex_unlock(&shost->scan_mutex); |
981 | } |
982 | EXPORT_SYMBOL(scsi_remove_device); |
983 | |
984 | static void __scsi_remove_target(struct scsi_target *starget) |
985 | { |
986 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
987 | unsigned long flags; |
988 | struct scsi_device *sdev; |
989 | |
990 | spin_lock_irqsave(shost->host_lock, flags); |
991 | starget->reap_ref++; |
992 | restart: |
993 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
994 | if (sdev->channel != starget->channel || |
995 | sdev->id != starget->id || |
996 | sdev->sdev_state == SDEV_DEL) |
997 | continue; |
998 | spin_unlock_irqrestore(shost->host_lock, flags); |
999 | scsi_remove_device(sdev); |
1000 | spin_lock_irqsave(shost->host_lock, flags); |
1001 | goto restart; |
1002 | } |
1003 | spin_unlock_irqrestore(shost->host_lock, flags); |
1004 | scsi_target_reap(starget); |
1005 | } |
1006 | |
1007 | static int __remove_child (struct device * dev, void * data) |
1008 | { |
1009 | if (scsi_is_target_device(dev)) |
1010 | __scsi_remove_target(to_scsi_target(dev)); |
1011 | return 0; |
1012 | } |
1013 | |
1014 | /** |
1015 | * scsi_remove_target - try to remove a target and all its devices |
1016 | * @dev: generic starget or parent of generic stargets to be removed |
1017 | * |
1018 | * Note: This is slightly racy. It is possible that if the user |
1019 | * requests the addition of another device then the target won't be |
1020 | * removed. |
1021 | */ |
1022 | void scsi_remove_target(struct device *dev) |
1023 | { |
1024 | struct device *rdev; |
1025 | |
1026 | if (scsi_is_target_device(dev)) { |
1027 | __scsi_remove_target(to_scsi_target(dev)); |
1028 | return; |
1029 | } |
1030 | |
1031 | rdev = get_device(dev); |
1032 | device_for_each_child(dev, NULL, __remove_child); |
1033 | put_device(rdev); |
1034 | } |
1035 | EXPORT_SYMBOL(scsi_remove_target); |
1036 | |
1037 | int scsi_register_driver(struct device_driver *drv) |
1038 | { |
1039 | drv->bus = &scsi_bus_type; |
1040 | |
1041 | return driver_register(drv); |
1042 | } |
1043 | EXPORT_SYMBOL(scsi_register_driver); |
1044 | |
1045 | int scsi_register_interface(struct class_interface *intf) |
1046 | { |
1047 | intf->class = &sdev_class; |
1048 | |
1049 | return class_interface_register(intf); |
1050 | } |
1051 | EXPORT_SYMBOL(scsi_register_interface); |
1052 | |
1053 | /** |
1054 | * scsi_sysfs_add_host - add scsi host to subsystem |
1055 | * @shost: scsi host struct to add to subsystem |
1056 | **/ |
1057 | int scsi_sysfs_add_host(struct Scsi_Host *shost) |
1058 | { |
1059 | int error, i; |
1060 | |
1061 | /* add host specific attributes */ |
1062 | if (shost->hostt->shost_attrs) { |
1063 | for (i = 0; shost->hostt->shost_attrs[i]; i++) { |
1064 | error = device_create_file(&shost->shost_dev, |
1065 | shost->hostt->shost_attrs[i]); |
1066 | if (error) |
1067 | return error; |
1068 | } |
1069 | } |
1070 | |
1071 | transport_register_device(&shost->shost_gendev); |
1072 | transport_configure_device(&shost->shost_gendev); |
1073 | return 0; |
1074 | } |
1075 | |
1076 | static struct device_type scsi_dev_type = { |
1077 | .name = "scsi_device", |
1078 | .release = scsi_device_dev_release, |
1079 | .groups = scsi_sdev_attr_groups, |
1080 | }; |
1081 | |
1082 | void scsi_sysfs_device_initialize(struct scsi_device *sdev) |
1083 | { |
1084 | unsigned long flags; |
1085 | struct Scsi_Host *shost = sdev->host; |
1086 | struct scsi_target *starget = sdev->sdev_target; |
1087 | |
1088 | device_initialize(&sdev->sdev_gendev); |
1089 | sdev->sdev_gendev.bus = &scsi_bus_type; |
1090 | sdev->sdev_gendev.type = &scsi_dev_type; |
1091 | dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d", |
1092 | sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); |
1093 | |
1094 | device_initialize(&sdev->sdev_dev); |
1095 | sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev); |
1096 | sdev->sdev_dev.class = &sdev_class; |
1097 | dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d", |
1098 | sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); |
1099 | sdev->scsi_level = starget->scsi_level; |
1100 | transport_setup_device(&sdev->sdev_gendev); |
1101 | spin_lock_irqsave(shost->host_lock, flags); |
1102 | list_add_tail(&sdev->same_target_siblings, &starget->devices); |
1103 | list_add_tail(&sdev->siblings, &shost->__devices); |
1104 | spin_unlock_irqrestore(shost->host_lock, flags); |
1105 | } |
1106 | |
1107 | int scsi_is_sdev_device(const struct device *dev) |
1108 | { |
1109 | return dev->type == &scsi_dev_type; |
1110 | } |
1111 | EXPORT_SYMBOL(scsi_is_sdev_device); |
1112 | |
1113 | /* A blank transport template that is used in drivers that don't |
1114 | * yet implement Transport Attributes */ |
1115 | struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; |
1116 |
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