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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 | #include <linux/pm_runtime.h> |
15 | |
16 | #include <scsi/scsi.h> |
17 | #include <scsi/scsi_device.h> |
18 | #include <scsi/scsi_host.h> |
19 | #include <scsi/scsi_tcq.h> |
20 | #include <scsi/scsi_transport.h> |
21 | #include <scsi/scsi_driver.h> |
22 | |
23 | #include "scsi_priv.h" |
24 | #include "scsi_logging.h" |
25 | |
26 | static struct device_type scsi_dev_type; |
27 | |
28 | static const struct { |
29 | enum scsi_device_state value; |
30 | char *name; |
31 | } sdev_states[] = { |
32 | { SDEV_CREATED, "created" }, |
33 | { SDEV_RUNNING, "running" }, |
34 | { SDEV_CANCEL, "cancel" }, |
35 | { SDEV_DEL, "deleted" }, |
36 | { SDEV_QUIESCE, "quiesce" }, |
37 | { SDEV_OFFLINE, "offline" }, |
38 | { SDEV_TRANSPORT_OFFLINE, "transport-offline" }, |
39 | { SDEV_BLOCK, "blocked" }, |
40 | { SDEV_CREATED_BLOCK, "created-blocked" }, |
41 | }; |
42 | |
43 | const char *scsi_device_state_name(enum scsi_device_state state) |
44 | { |
45 | int i; |
46 | char *name = NULL; |
47 | |
48 | for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { |
49 | if (sdev_states[i].value == state) { |
50 | name = sdev_states[i].name; |
51 | break; |
52 | } |
53 | } |
54 | return name; |
55 | } |
56 | |
57 | static const struct { |
58 | enum scsi_host_state value; |
59 | char *name; |
60 | } shost_states[] = { |
61 | { SHOST_CREATED, "created" }, |
62 | { SHOST_RUNNING, "running" }, |
63 | { SHOST_CANCEL, "cancel" }, |
64 | { SHOST_DEL, "deleted" }, |
65 | { SHOST_RECOVERY, "recovery" }, |
66 | { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, |
67 | { SHOST_DEL_RECOVERY, "deleted/recovery", }, |
68 | }; |
69 | const char *scsi_host_state_name(enum scsi_host_state state) |
70 | { |
71 | int i; |
72 | char *name = NULL; |
73 | |
74 | for (i = 0; i < ARRAY_SIZE(shost_states); i++) { |
75 | if (shost_states[i].value == state) { |
76 | name = shost_states[i].name; |
77 | break; |
78 | } |
79 | } |
80 | return name; |
81 | } |
82 | |
83 | static int check_set(unsigned int *val, char *src) |
84 | { |
85 | char *last; |
86 | |
87 | if (strncmp(src, "-", 20) == 0) { |
88 | *val = SCAN_WILD_CARD; |
89 | } else { |
90 | /* |
91 | * Doesn't check for int overflow |
92 | */ |
93 | *val = simple_strtoul(src, &last, 0); |
94 | if (*last != '\0') |
95 | return 1; |
96 | } |
97 | return 0; |
98 | } |
99 | |
100 | static int scsi_scan(struct Scsi_Host *shost, const char *str) |
101 | { |
102 | char s1[15], s2[15], s3[15], junk; |
103 | unsigned int channel, id, lun; |
104 | int res; |
105 | |
106 | res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk); |
107 | if (res != 3) |
108 | return -EINVAL; |
109 | if (check_set(&channel, s1)) |
110 | return -EINVAL; |
111 | if (check_set(&id, s2)) |
112 | return -EINVAL; |
113 | if (check_set(&lun, s3)) |
114 | return -EINVAL; |
115 | if (shost->transportt->user_scan) |
116 | res = shost->transportt->user_scan(shost, channel, id, lun); |
117 | else |
118 | res = scsi_scan_host_selected(shost, channel, id, lun, 1); |
119 | return res; |
120 | } |
121 | |
122 | /* |
123 | * shost_show_function: macro to create an attr function that can be used to |
124 | * show a non-bit field. |
125 | */ |
126 | #define shost_show_function(name, field, format_string) \ |
127 | static ssize_t \ |
128 | show_##name (struct device *dev, struct device_attribute *attr, \ |
129 | char *buf) \ |
130 | { \ |
131 | struct Scsi_Host *shost = class_to_shost(dev); \ |
132 | return snprintf (buf, 20, format_string, shost->field); \ |
133 | } |
134 | |
135 | /* |
136 | * shost_rd_attr: macro to create a function and attribute variable for a |
137 | * read only field. |
138 | */ |
139 | #define shost_rd_attr2(name, field, format_string) \ |
140 | shost_show_function(name, field, format_string) \ |
141 | static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); |
142 | |
143 | #define shost_rd_attr(field, format_string) \ |
144 | shost_rd_attr2(field, field, format_string) |
145 | |
146 | /* |
147 | * Create the actual show/store functions and data structures. |
148 | */ |
149 | |
150 | static ssize_t |
151 | store_scan(struct device *dev, struct device_attribute *attr, |
152 | const char *buf, size_t count) |
153 | { |
154 | struct Scsi_Host *shost = class_to_shost(dev); |
155 | int res; |
156 | |
157 | res = scsi_scan(shost, buf); |
158 | if (res == 0) |
159 | res = count; |
160 | return res; |
161 | }; |
162 | static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); |
163 | |
164 | static ssize_t |
165 | store_shost_state(struct device *dev, struct device_attribute *attr, |
166 | const char *buf, size_t count) |
167 | { |
168 | int i; |
169 | struct Scsi_Host *shost = class_to_shost(dev); |
170 | enum scsi_host_state state = 0; |
171 | |
172 | for (i = 0; i < ARRAY_SIZE(shost_states); i++) { |
173 | const int len = strlen(shost_states[i].name); |
174 | if (strncmp(shost_states[i].name, buf, len) == 0 && |
175 | buf[len] == '\n') { |
176 | state = shost_states[i].value; |
177 | break; |
178 | } |
179 | } |
180 | if (!state) |
181 | return -EINVAL; |
182 | |
183 | if (scsi_host_set_state(shost, state)) |
184 | return -EINVAL; |
185 | return count; |
186 | } |
187 | |
188 | static ssize_t |
189 | show_shost_state(struct device *dev, struct device_attribute *attr, char *buf) |
190 | { |
191 | struct Scsi_Host *shost = class_to_shost(dev); |
192 | const char *name = scsi_host_state_name(shost->shost_state); |
193 | |
194 | if (!name) |
195 | return -EINVAL; |
196 | |
197 | return snprintf(buf, 20, "%s\n", name); |
198 | } |
199 | |
200 | /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */ |
201 | struct device_attribute dev_attr_hstate = |
202 | __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); |
203 | |
204 | static ssize_t |
205 | show_shost_mode(unsigned int mode, char *buf) |
206 | { |
207 | ssize_t len = 0; |
208 | |
209 | if (mode & MODE_INITIATOR) |
210 | len = sprintf(buf, "%s", "Initiator"); |
211 | |
212 | if (mode & MODE_TARGET) |
213 | len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); |
214 | |
215 | len += sprintf(buf + len, "\n"); |
216 | |
217 | return len; |
218 | } |
219 | |
220 | static ssize_t |
221 | show_shost_supported_mode(struct device *dev, struct device_attribute *attr, |
222 | char *buf) |
223 | { |
224 | struct Scsi_Host *shost = class_to_shost(dev); |
225 | unsigned int supported_mode = shost->hostt->supported_mode; |
226 | |
227 | if (supported_mode == MODE_UNKNOWN) |
228 | /* by default this should be initiator */ |
229 | supported_mode = MODE_INITIATOR; |
230 | |
231 | return show_shost_mode(supported_mode, buf); |
232 | } |
233 | |
234 | static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); |
235 | |
236 | static ssize_t |
237 | show_shost_active_mode(struct device *dev, |
238 | struct device_attribute *attr, char *buf) |
239 | { |
240 | struct Scsi_Host *shost = class_to_shost(dev); |
241 | |
242 | if (shost->active_mode == MODE_UNKNOWN) |
243 | return snprintf(buf, 20, "unknown\n"); |
244 | else |
245 | return show_shost_mode(shost->active_mode, buf); |
246 | } |
247 | |
248 | static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); |
249 | |
250 | static int check_reset_type(const char *str) |
251 | { |
252 | if (sysfs_streq(str, "adapter")) |
253 | return SCSI_ADAPTER_RESET; |
254 | else if (sysfs_streq(str, "firmware")) |
255 | return SCSI_FIRMWARE_RESET; |
256 | else |
257 | return 0; |
258 | } |
259 | |
260 | static ssize_t |
261 | store_host_reset(struct device *dev, struct device_attribute *attr, |
262 | const char *buf, size_t count) |
263 | { |
264 | struct Scsi_Host *shost = class_to_shost(dev); |
265 | struct scsi_host_template *sht = shost->hostt; |
266 | int ret = -EINVAL; |
267 | int type; |
268 | |
269 | type = check_reset_type(buf); |
270 | if (!type) |
271 | goto exit_store_host_reset; |
272 | |
273 | if (sht->host_reset) |
274 | ret = sht->host_reset(shost, type); |
275 | |
276 | exit_store_host_reset: |
277 | if (ret == 0) |
278 | ret = count; |
279 | return ret; |
280 | } |
281 | |
282 | static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset); |
283 | |
284 | shost_rd_attr(unique_id, "%u\n"); |
285 | shost_rd_attr(host_busy, "%hu\n"); |
286 | shost_rd_attr(cmd_per_lun, "%hd\n"); |
287 | shost_rd_attr(can_queue, "%hd\n"); |
288 | shost_rd_attr(sg_tablesize, "%hu\n"); |
289 | shost_rd_attr(sg_prot_tablesize, "%hu\n"); |
290 | shost_rd_attr(unchecked_isa_dma, "%d\n"); |
291 | shost_rd_attr(prot_capabilities, "%u\n"); |
292 | shost_rd_attr(prot_guard_type, "%hd\n"); |
293 | shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); |
294 | |
295 | static struct attribute *scsi_sysfs_shost_attrs[] = { |
296 | &dev_attr_unique_id.attr, |
297 | &dev_attr_host_busy.attr, |
298 | &dev_attr_cmd_per_lun.attr, |
299 | &dev_attr_can_queue.attr, |
300 | &dev_attr_sg_tablesize.attr, |
301 | &dev_attr_sg_prot_tablesize.attr, |
302 | &dev_attr_unchecked_isa_dma.attr, |
303 | &dev_attr_proc_name.attr, |
304 | &dev_attr_scan.attr, |
305 | &dev_attr_hstate.attr, |
306 | &dev_attr_supported_mode.attr, |
307 | &dev_attr_active_mode.attr, |
308 | &dev_attr_prot_capabilities.attr, |
309 | &dev_attr_prot_guard_type.attr, |
310 | &dev_attr_host_reset.attr, |
311 | NULL |
312 | }; |
313 | |
314 | struct attribute_group scsi_shost_attr_group = { |
315 | .attrs = scsi_sysfs_shost_attrs, |
316 | }; |
317 | |
318 | const struct attribute_group *scsi_sysfs_shost_attr_groups[] = { |
319 | &scsi_shost_attr_group, |
320 | NULL |
321 | }; |
322 | |
323 | static void scsi_device_cls_release(struct device *class_dev) |
324 | { |
325 | struct scsi_device *sdev; |
326 | |
327 | sdev = class_to_sdev(class_dev); |
328 | put_device(&sdev->sdev_gendev); |
329 | } |
330 | |
331 | static void scsi_device_dev_release_usercontext(struct work_struct *work) |
332 | { |
333 | struct scsi_device *sdev; |
334 | struct device *parent; |
335 | struct scsi_target *starget; |
336 | struct list_head *this, *tmp; |
337 | unsigned long flags; |
338 | |
339 | sdev = container_of(work, struct scsi_device, ew.work); |
340 | |
341 | parent = sdev->sdev_gendev.parent; |
342 | starget = to_scsi_target(parent); |
343 | |
344 | spin_lock_irqsave(sdev->host->host_lock, flags); |
345 | starget->reap_ref++; |
346 | list_del(&sdev->siblings); |
347 | list_del(&sdev->same_target_siblings); |
348 | list_del(&sdev->starved_entry); |
349 | spin_unlock_irqrestore(sdev->host->host_lock, flags); |
350 | |
351 | cancel_work_sync(&sdev->event_work); |
352 | |
353 | list_for_each_safe(this, tmp, &sdev->event_list) { |
354 | struct scsi_event *evt; |
355 | |
356 | evt = list_entry(this, struct scsi_event, node); |
357 | list_del(&evt->node); |
358 | kfree(evt); |
359 | } |
360 | |
361 | blk_put_queue(sdev->request_queue); |
362 | /* NULL queue means the device can't be used */ |
363 | sdev->request_queue = NULL; |
364 | |
365 | scsi_target_reap(scsi_target(sdev)); |
366 | |
367 | kfree(sdev->inquiry); |
368 | kfree(sdev); |
369 | |
370 | if (parent) |
371 | put_device(parent); |
372 | } |
373 | |
374 | static void scsi_device_dev_release(struct device *dev) |
375 | { |
376 | struct scsi_device *sdp = to_scsi_device(dev); |
377 | execute_in_process_context(scsi_device_dev_release_usercontext, |
378 | &sdp->ew); |
379 | } |
380 | |
381 | static struct class sdev_class = { |
382 | .name = "scsi_device", |
383 | .dev_release = scsi_device_cls_release, |
384 | }; |
385 | |
386 | /* all probing is done in the individual ->probe routines */ |
387 | static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) |
388 | { |
389 | struct scsi_device *sdp; |
390 | |
391 | if (dev->type != &scsi_dev_type) |
392 | return 0; |
393 | |
394 | sdp = to_scsi_device(dev); |
395 | if (sdp->no_uld_attach) |
396 | return 0; |
397 | return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; |
398 | } |
399 | |
400 | static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) |
401 | { |
402 | struct scsi_device *sdev; |
403 | |
404 | if (dev->type != &scsi_dev_type) |
405 | return 0; |
406 | |
407 | sdev = to_scsi_device(dev); |
408 | |
409 | add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); |
410 | return 0; |
411 | } |
412 | |
413 | struct bus_type scsi_bus_type = { |
414 | .name = "scsi", |
415 | .match = scsi_bus_match, |
416 | .uevent = scsi_bus_uevent, |
417 | #ifdef CONFIG_PM |
418 | .pm = &scsi_bus_pm_ops, |
419 | #endif |
420 | }; |
421 | EXPORT_SYMBOL_GPL(scsi_bus_type); |
422 | |
423 | int scsi_sysfs_register(void) |
424 | { |
425 | int error; |
426 | |
427 | error = bus_register(&scsi_bus_type); |
428 | if (!error) { |
429 | error = class_register(&sdev_class); |
430 | if (error) |
431 | bus_unregister(&scsi_bus_type); |
432 | } |
433 | |
434 | return error; |
435 | } |
436 | |
437 | void scsi_sysfs_unregister(void) |
438 | { |
439 | class_unregister(&sdev_class); |
440 | bus_unregister(&scsi_bus_type); |
441 | } |
442 | |
443 | /* |
444 | * sdev_show_function: macro to create an attr function that can be used to |
445 | * show a non-bit field. |
446 | */ |
447 | #define sdev_show_function(field, format_string) \ |
448 | static ssize_t \ |
449 | sdev_show_##field (struct device *dev, struct device_attribute *attr, \ |
450 | char *buf) \ |
451 | { \ |
452 | struct scsi_device *sdev; \ |
453 | sdev = to_scsi_device(dev); \ |
454 | return snprintf (buf, 20, format_string, sdev->field); \ |
455 | } \ |
456 | |
457 | /* |
458 | * sdev_rd_attr: macro to create a function and attribute variable for a |
459 | * read only field. |
460 | */ |
461 | #define sdev_rd_attr(field, format_string) \ |
462 | sdev_show_function(field, format_string) \ |
463 | static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); |
464 | |
465 | |
466 | /* |
467 | * sdev_rw_attr: create a function and attribute variable for a |
468 | * read/write field. |
469 | */ |
470 | #define sdev_rw_attr(field, format_string) \ |
471 | sdev_show_function(field, format_string) \ |
472 | \ |
473 | static ssize_t \ |
474 | sdev_store_##field (struct device *dev, struct device_attribute *attr, \ |
475 | const char *buf, size_t count) \ |
476 | { \ |
477 | struct scsi_device *sdev; \ |
478 | sdev = to_scsi_device(dev); \ |
479 | sscanf (buf, format_string, &sdev->field); \ |
480 | return count; \ |
481 | } \ |
482 | static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); |
483 | |
484 | /* Currently we don't export bit fields, but we might in future, |
485 | * so leave this code in */ |
486 | #if 0 |
487 | /* |
488 | * sdev_rd_attr: create a function and attribute variable for a |
489 | * read/write bit field. |
490 | */ |
491 | #define sdev_rw_attr_bit(field) \ |
492 | sdev_show_function(field, "%d\n") \ |
493 | \ |
494 | static ssize_t \ |
495 | sdev_store_##field (struct device *dev, struct device_attribute *attr, \ |
496 | const char *buf, size_t count) \ |
497 | { \ |
498 | int ret; \ |
499 | struct scsi_device *sdev; \ |
500 | ret = scsi_sdev_check_buf_bit(buf); \ |
501 | if (ret >= 0) { \ |
502 | sdev = to_scsi_device(dev); \ |
503 | sdev->field = ret; \ |
504 | ret = count; \ |
505 | } \ |
506 | return ret; \ |
507 | } \ |
508 | static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); |
509 | |
510 | /* |
511 | * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", |
512 | * else return -EINVAL. |
513 | */ |
514 | static int scsi_sdev_check_buf_bit(const char *buf) |
515 | { |
516 | if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { |
517 | if (buf[0] == '1') |
518 | return 1; |
519 | else if (buf[0] == '0') |
520 | return 0; |
521 | else |
522 | return -EINVAL; |
523 | } else |
524 | return -EINVAL; |
525 | } |
526 | #endif |
527 | /* |
528 | * Create the actual show/store functions and data structures. |
529 | */ |
530 | sdev_rd_attr (device_blocked, "%d\n"); |
531 | sdev_rd_attr (queue_depth, "%d\n"); |
532 | sdev_rd_attr (type, "%d\n"); |
533 | sdev_rd_attr (scsi_level, "%d\n"); |
534 | sdev_rd_attr (vendor, "%.8s\n"); |
535 | sdev_rd_attr (model, "%.16s\n"); |
536 | sdev_rd_attr (rev, "%.4s\n"); |
537 | |
538 | /* |
539 | * TODO: can we make these symlinks to the block layer ones? |
540 | */ |
541 | static ssize_t |
542 | sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) |
543 | { |
544 | struct scsi_device *sdev; |
545 | sdev = to_scsi_device(dev); |
546 | return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ); |
547 | } |
548 | |
549 | static ssize_t |
550 | sdev_store_timeout (struct device *dev, struct device_attribute *attr, |
551 | const char *buf, size_t count) |
552 | { |
553 | struct scsi_device *sdev; |
554 | int timeout; |
555 | sdev = to_scsi_device(dev); |
556 | sscanf (buf, "%d\n", &timeout); |
557 | blk_queue_rq_timeout(sdev->request_queue, timeout * HZ); |
558 | return count; |
559 | } |
560 | static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); |
561 | |
562 | static ssize_t |
563 | store_rescan_field (struct device *dev, struct device_attribute *attr, |
564 | const char *buf, size_t count) |
565 | { |
566 | scsi_rescan_device(dev); |
567 | return count; |
568 | } |
569 | static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); |
570 | |
571 | static void sdev_store_delete_callback(struct device *dev) |
572 | { |
573 | scsi_remove_device(to_scsi_device(dev)); |
574 | } |
575 | |
576 | static ssize_t |
577 | sdev_store_delete(struct device *dev, struct device_attribute *attr, |
578 | const char *buf, size_t count) |
579 | { |
580 | int rc; |
581 | |
582 | /* An attribute cannot be unregistered by one of its own methods, |
583 | * so we have to use this roundabout approach. |
584 | */ |
585 | rc = device_schedule_callback(dev, sdev_store_delete_callback); |
586 | if (rc) |
587 | count = rc; |
588 | return count; |
589 | }; |
590 | static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); |
591 | |
592 | static ssize_t |
593 | store_state_field(struct device *dev, struct device_attribute *attr, |
594 | const char *buf, size_t count) |
595 | { |
596 | int i; |
597 | struct scsi_device *sdev = to_scsi_device(dev); |
598 | enum scsi_device_state state = 0; |
599 | |
600 | for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { |
601 | const int len = strlen(sdev_states[i].name); |
602 | if (strncmp(sdev_states[i].name, buf, len) == 0 && |
603 | buf[len] == '\n') { |
604 | state = sdev_states[i].value; |
605 | break; |
606 | } |
607 | } |
608 | if (!state) |
609 | return -EINVAL; |
610 | |
611 | if (scsi_device_set_state(sdev, state)) |
612 | return -EINVAL; |
613 | return count; |
614 | } |
615 | |
616 | static ssize_t |
617 | show_state_field(struct device *dev, struct device_attribute *attr, char *buf) |
618 | { |
619 | struct scsi_device *sdev = to_scsi_device(dev); |
620 | const char *name = scsi_device_state_name(sdev->sdev_state); |
621 | |
622 | if (!name) |
623 | return -EINVAL; |
624 | |
625 | return snprintf(buf, 20, "%s\n", name); |
626 | } |
627 | |
628 | static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); |
629 | |
630 | static ssize_t |
631 | show_queue_type_field(struct device *dev, struct device_attribute *attr, |
632 | char *buf) |
633 | { |
634 | struct scsi_device *sdev = to_scsi_device(dev); |
635 | const char *name = "none"; |
636 | |
637 | if (sdev->ordered_tags) |
638 | name = "ordered"; |
639 | else if (sdev->simple_tags) |
640 | name = "simple"; |
641 | |
642 | return snprintf(buf, 20, "%s\n", name); |
643 | } |
644 | |
645 | static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); |
646 | |
647 | static ssize_t |
648 | show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) |
649 | { |
650 | return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); |
651 | } |
652 | |
653 | static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); |
654 | |
655 | #define show_sdev_iostat(field) \ |
656 | static ssize_t \ |
657 | show_iostat_##field(struct device *dev, struct device_attribute *attr, \ |
658 | char *buf) \ |
659 | { \ |
660 | struct scsi_device *sdev = to_scsi_device(dev); \ |
661 | unsigned long long count = atomic_read(&sdev->field); \ |
662 | return snprintf(buf, 20, "0x%llx\n", count); \ |
663 | } \ |
664 | static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) |
665 | |
666 | show_sdev_iostat(iorequest_cnt); |
667 | show_sdev_iostat(iodone_cnt); |
668 | show_sdev_iostat(ioerr_cnt); |
669 | |
670 | static ssize_t |
671 | sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
672 | { |
673 | struct scsi_device *sdev; |
674 | sdev = to_scsi_device(dev); |
675 | return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); |
676 | } |
677 | static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); |
678 | |
679 | #define DECLARE_EVT_SHOW(name, Cap_name) \ |
680 | static ssize_t \ |
681 | sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ |
682 | char *buf) \ |
683 | { \ |
684 | struct scsi_device *sdev = to_scsi_device(dev); \ |
685 | int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ |
686 | return snprintf(buf, 20, "%d\n", val); \ |
687 | } |
688 | |
689 | #define DECLARE_EVT_STORE(name, Cap_name) \ |
690 | static ssize_t \ |
691 | sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ |
692 | const char *buf, size_t count) \ |
693 | { \ |
694 | struct scsi_device *sdev = to_scsi_device(dev); \ |
695 | int val = simple_strtoul(buf, NULL, 0); \ |
696 | if (val == 0) \ |
697 | clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ |
698 | else if (val == 1) \ |
699 | set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ |
700 | else \ |
701 | return -EINVAL; \ |
702 | return count; \ |
703 | } |
704 | |
705 | #define DECLARE_EVT(name, Cap_name) \ |
706 | DECLARE_EVT_SHOW(name, Cap_name) \ |
707 | DECLARE_EVT_STORE(name, Cap_name) \ |
708 | static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ |
709 | sdev_store_evt_##name); |
710 | #define REF_EVT(name) &dev_attr_evt_##name.attr |
711 | |
712 | DECLARE_EVT(media_change, MEDIA_CHANGE) |
713 | |
714 | /* Default template for device attributes. May NOT be modified */ |
715 | static struct attribute *scsi_sdev_attrs[] = { |
716 | &dev_attr_device_blocked.attr, |
717 | &dev_attr_type.attr, |
718 | &dev_attr_scsi_level.attr, |
719 | &dev_attr_vendor.attr, |
720 | &dev_attr_model.attr, |
721 | &dev_attr_rev.attr, |
722 | &dev_attr_rescan.attr, |
723 | &dev_attr_delete.attr, |
724 | &dev_attr_state.attr, |
725 | &dev_attr_timeout.attr, |
726 | &dev_attr_iocounterbits.attr, |
727 | &dev_attr_iorequest_cnt.attr, |
728 | &dev_attr_iodone_cnt.attr, |
729 | &dev_attr_ioerr_cnt.attr, |
730 | &dev_attr_modalias.attr, |
731 | REF_EVT(media_change), |
732 | NULL |
733 | }; |
734 | |
735 | static struct attribute_group scsi_sdev_attr_group = { |
736 | .attrs = scsi_sdev_attrs, |
737 | }; |
738 | |
739 | static const struct attribute_group *scsi_sdev_attr_groups[] = { |
740 | &scsi_sdev_attr_group, |
741 | NULL |
742 | }; |
743 | |
744 | static ssize_t |
745 | sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, |
746 | const char *buf, size_t count) |
747 | { |
748 | int depth, retval; |
749 | struct scsi_device *sdev = to_scsi_device(dev); |
750 | struct scsi_host_template *sht = sdev->host->hostt; |
751 | |
752 | if (!sht->change_queue_depth) |
753 | return -EINVAL; |
754 | |
755 | depth = simple_strtoul(buf, NULL, 0); |
756 | |
757 | if (depth < 1) |
758 | return -EINVAL; |
759 | |
760 | retval = sht->change_queue_depth(sdev, depth, |
761 | SCSI_QDEPTH_DEFAULT); |
762 | if (retval < 0) |
763 | return retval; |
764 | |
765 | sdev->max_queue_depth = sdev->queue_depth; |
766 | |
767 | return count; |
768 | } |
769 | |
770 | static struct device_attribute sdev_attr_queue_depth_rw = |
771 | __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, |
772 | sdev_store_queue_depth_rw); |
773 | |
774 | static ssize_t |
775 | sdev_show_queue_ramp_up_period(struct device *dev, |
776 | struct device_attribute *attr, |
777 | char *buf) |
778 | { |
779 | struct scsi_device *sdev; |
780 | sdev = to_scsi_device(dev); |
781 | return snprintf(buf, 20, "%u\n", |
782 | jiffies_to_msecs(sdev->queue_ramp_up_period)); |
783 | } |
784 | |
785 | static ssize_t |
786 | sdev_store_queue_ramp_up_period(struct device *dev, |
787 | struct device_attribute *attr, |
788 | const char *buf, size_t count) |
789 | { |
790 | struct scsi_device *sdev = to_scsi_device(dev); |
791 | unsigned long period; |
792 | |
793 | if (strict_strtoul(buf, 10, &period)) |
794 | return -EINVAL; |
795 | |
796 | sdev->queue_ramp_up_period = msecs_to_jiffies(period); |
797 | return period; |
798 | } |
799 | |
800 | static struct device_attribute sdev_attr_queue_ramp_up_period = |
801 | __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR, |
802 | sdev_show_queue_ramp_up_period, |
803 | sdev_store_queue_ramp_up_period); |
804 | |
805 | static ssize_t |
806 | sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, |
807 | const char *buf, size_t count) |
808 | { |
809 | struct scsi_device *sdev = to_scsi_device(dev); |
810 | struct scsi_host_template *sht = sdev->host->hostt; |
811 | int tag_type = 0, retval; |
812 | int prev_tag_type = scsi_get_tag_type(sdev); |
813 | |
814 | if (!sdev->tagged_supported || !sht->change_queue_type) |
815 | return -EINVAL; |
816 | |
817 | if (strncmp(buf, "ordered", 7) == 0) |
818 | tag_type = MSG_ORDERED_TAG; |
819 | else if (strncmp(buf, "simple", 6) == 0) |
820 | tag_type = MSG_SIMPLE_TAG; |
821 | else if (strncmp(buf, "none", 4) != 0) |
822 | return -EINVAL; |
823 | |
824 | if (tag_type == prev_tag_type) |
825 | return count; |
826 | |
827 | retval = sht->change_queue_type(sdev, tag_type); |
828 | if (retval < 0) |
829 | return retval; |
830 | |
831 | return count; |
832 | } |
833 | |
834 | static int scsi_target_add(struct scsi_target *starget) |
835 | { |
836 | int error; |
837 | |
838 | if (starget->state != STARGET_CREATED) |
839 | return 0; |
840 | |
841 | error = device_add(&starget->dev); |
842 | if (error) { |
843 | dev_err(&starget->dev, "target device_add failed, error %d\n", error); |
844 | return error; |
845 | } |
846 | transport_add_device(&starget->dev); |
847 | starget->state = STARGET_RUNNING; |
848 | |
849 | pm_runtime_set_active(&starget->dev); |
850 | pm_runtime_enable(&starget->dev); |
851 | device_enable_async_suspend(&starget->dev); |
852 | |
853 | return 0; |
854 | } |
855 | |
856 | static struct device_attribute sdev_attr_queue_type_rw = |
857 | __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, |
858 | sdev_store_queue_type_rw); |
859 | |
860 | /** |
861 | * scsi_sysfs_add_sdev - add scsi device to sysfs |
862 | * @sdev: scsi_device to add |
863 | * |
864 | * Return value: |
865 | * 0 on Success / non-zero on Failure |
866 | **/ |
867 | int scsi_sysfs_add_sdev(struct scsi_device *sdev) |
868 | { |
869 | int error, i; |
870 | struct request_queue *rq = sdev->request_queue; |
871 | struct scsi_target *starget = sdev->sdev_target; |
872 | |
873 | error = scsi_device_set_state(sdev, SDEV_RUNNING); |
874 | if (error) |
875 | return error; |
876 | |
877 | error = scsi_target_add(starget); |
878 | if (error) |
879 | return error; |
880 | |
881 | transport_configure_device(&starget->dev); |
882 | |
883 | device_enable_async_suspend(&sdev->sdev_gendev); |
884 | scsi_autopm_get_target(starget); |
885 | pm_runtime_set_active(&sdev->sdev_gendev); |
886 | pm_runtime_forbid(&sdev->sdev_gendev); |
887 | pm_runtime_enable(&sdev->sdev_gendev); |
888 | scsi_autopm_put_target(starget); |
889 | |
890 | /* The following call will keep sdev active indefinitely, until |
891 | * its driver does a corresponding scsi_autopm_pm_device(). Only |
892 | * drivers supporting autosuspend will do this. |
893 | */ |
894 | scsi_autopm_get_device(sdev); |
895 | |
896 | error = device_add(&sdev->sdev_gendev); |
897 | if (error) { |
898 | sdev_printk(KERN_INFO, sdev, |
899 | "failed to add device: %d\n", error); |
900 | return error; |
901 | } |
902 | device_enable_async_suspend(&sdev->sdev_dev); |
903 | error = device_add(&sdev->sdev_dev); |
904 | if (error) { |
905 | sdev_printk(KERN_INFO, sdev, |
906 | "failed to add class device: %d\n", error); |
907 | device_del(&sdev->sdev_gendev); |
908 | return error; |
909 | } |
910 | transport_add_device(&sdev->sdev_gendev); |
911 | sdev->is_visible = 1; |
912 | |
913 | /* create queue files, which may be writable, depending on the host */ |
914 | if (sdev->host->hostt->change_queue_depth) { |
915 | error = device_create_file(&sdev->sdev_gendev, |
916 | &sdev_attr_queue_depth_rw); |
917 | error = device_create_file(&sdev->sdev_gendev, |
918 | &sdev_attr_queue_ramp_up_period); |
919 | } |
920 | else |
921 | error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth); |
922 | if (error) |
923 | return error; |
924 | |
925 | if (sdev->host->hostt->change_queue_type) |
926 | error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw); |
927 | else |
928 | error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type); |
929 | if (error) |
930 | return error; |
931 | |
932 | error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL); |
933 | |
934 | if (error) |
935 | /* we're treating error on bsg register as non-fatal, |
936 | * so pretend nothing went wrong */ |
937 | sdev_printk(KERN_INFO, sdev, |
938 | "Failed to register bsg queue, errno=%d\n", error); |
939 | |
940 | /* add additional host specific attributes */ |
941 | if (sdev->host->hostt->sdev_attrs) { |
942 | for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { |
943 | error = device_create_file(&sdev->sdev_gendev, |
944 | sdev->host->hostt->sdev_attrs[i]); |
945 | if (error) |
946 | return error; |
947 | } |
948 | } |
949 | |
950 | return error; |
951 | } |
952 | |
953 | void __scsi_remove_device(struct scsi_device *sdev) |
954 | { |
955 | struct device *dev = &sdev->sdev_gendev; |
956 | |
957 | if (sdev->is_visible) { |
958 | if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) |
959 | return; |
960 | |
961 | bsg_unregister_queue(sdev->request_queue); |
962 | device_unregister(&sdev->sdev_dev); |
963 | transport_remove_device(dev); |
964 | device_del(dev); |
965 | } else |
966 | put_device(&sdev->sdev_dev); |
967 | |
968 | /* |
969 | * Stop accepting new requests and wait until all queuecommand() and |
970 | * scsi_run_queue() invocations have finished before tearing down the |
971 | * device. |
972 | */ |
973 | scsi_device_set_state(sdev, SDEV_DEL); |
974 | blk_cleanup_queue(sdev->request_queue); |
975 | cancel_work_sync(&sdev->requeue_work); |
976 | |
977 | if (sdev->host->hostt->slave_destroy) |
978 | sdev->host->hostt->slave_destroy(sdev); |
979 | transport_destroy_device(dev); |
980 | |
981 | put_device(dev); |
982 | } |
983 | |
984 | /** |
985 | * scsi_remove_device - unregister a device from the scsi bus |
986 | * @sdev: scsi_device to unregister |
987 | **/ |
988 | void scsi_remove_device(struct scsi_device *sdev) |
989 | { |
990 | struct Scsi_Host *shost = sdev->host; |
991 | |
992 | mutex_lock(&shost->scan_mutex); |
993 | __scsi_remove_device(sdev); |
994 | mutex_unlock(&shost->scan_mutex); |
995 | } |
996 | EXPORT_SYMBOL(scsi_remove_device); |
997 | |
998 | static void __scsi_remove_target(struct scsi_target *starget) |
999 | { |
1000 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1001 | unsigned long flags; |
1002 | struct scsi_device *sdev; |
1003 | |
1004 | spin_lock_irqsave(shost->host_lock, flags); |
1005 | restart: |
1006 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1007 | if (sdev->channel != starget->channel || |
1008 | sdev->id != starget->id || |
1009 | scsi_device_get(sdev)) |
1010 | continue; |
1011 | spin_unlock_irqrestore(shost->host_lock, flags); |
1012 | scsi_remove_device(sdev); |
1013 | scsi_device_put(sdev); |
1014 | spin_lock_irqsave(shost->host_lock, flags); |
1015 | goto restart; |
1016 | } |
1017 | spin_unlock_irqrestore(shost->host_lock, flags); |
1018 | } |
1019 | |
1020 | /** |
1021 | * scsi_remove_target - try to remove a target and all its devices |
1022 | * @dev: generic starget or parent of generic stargets to be removed |
1023 | * |
1024 | * Note: This is slightly racy. It is possible that if the user |
1025 | * requests the addition of another device then the target won't be |
1026 | * removed. |
1027 | */ |
1028 | void scsi_remove_target(struct device *dev) |
1029 | { |
1030 | struct Scsi_Host *shost = dev_to_shost(dev->parent); |
1031 | struct scsi_target *starget, *last = NULL; |
1032 | unsigned long flags; |
1033 | |
1034 | /* remove targets being careful to lookup next entry before |
1035 | * deleting the last |
1036 | */ |
1037 | spin_lock_irqsave(shost->host_lock, flags); |
1038 | list_for_each_entry(starget, &shost->__targets, siblings) { |
1039 | if (starget->state == STARGET_DEL) |
1040 | continue; |
1041 | if (starget->dev.parent == dev || &starget->dev == dev) { |
1042 | /* assuming new targets arrive at the end */ |
1043 | starget->reap_ref++; |
1044 | spin_unlock_irqrestore(shost->host_lock, flags); |
1045 | if (last) |
1046 | scsi_target_reap(last); |
1047 | last = starget; |
1048 | __scsi_remove_target(starget); |
1049 | spin_lock_irqsave(shost->host_lock, flags); |
1050 | } |
1051 | } |
1052 | spin_unlock_irqrestore(shost->host_lock, flags); |
1053 | |
1054 | if (last) |
1055 | scsi_target_reap(last); |
1056 | } |
1057 | EXPORT_SYMBOL(scsi_remove_target); |
1058 | |
1059 | int scsi_register_driver(struct device_driver *drv) |
1060 | { |
1061 | drv->bus = &scsi_bus_type; |
1062 | |
1063 | return driver_register(drv); |
1064 | } |
1065 | EXPORT_SYMBOL(scsi_register_driver); |
1066 | |
1067 | int scsi_register_interface(struct class_interface *intf) |
1068 | { |
1069 | intf->class = &sdev_class; |
1070 | |
1071 | return class_interface_register(intf); |
1072 | } |
1073 | EXPORT_SYMBOL(scsi_register_interface); |
1074 | |
1075 | /** |
1076 | * scsi_sysfs_add_host - add scsi host to subsystem |
1077 | * @shost: scsi host struct to add to subsystem |
1078 | **/ |
1079 | int scsi_sysfs_add_host(struct Scsi_Host *shost) |
1080 | { |
1081 | int error, i; |
1082 | |
1083 | /* add host specific attributes */ |
1084 | if (shost->hostt->shost_attrs) { |
1085 | for (i = 0; shost->hostt->shost_attrs[i]; i++) { |
1086 | error = device_create_file(&shost->shost_dev, |
1087 | shost->hostt->shost_attrs[i]); |
1088 | if (error) |
1089 | return error; |
1090 | } |
1091 | } |
1092 | |
1093 | transport_register_device(&shost->shost_gendev); |
1094 | transport_configure_device(&shost->shost_gendev); |
1095 | return 0; |
1096 | } |
1097 | |
1098 | static struct device_type scsi_dev_type = { |
1099 | .name = "scsi_device", |
1100 | .release = scsi_device_dev_release, |
1101 | .groups = scsi_sdev_attr_groups, |
1102 | }; |
1103 | |
1104 | void scsi_sysfs_device_initialize(struct scsi_device *sdev) |
1105 | { |
1106 | unsigned long flags; |
1107 | struct Scsi_Host *shost = sdev->host; |
1108 | struct scsi_target *starget = sdev->sdev_target; |
1109 | |
1110 | device_initialize(&sdev->sdev_gendev); |
1111 | sdev->sdev_gendev.bus = &scsi_bus_type; |
1112 | sdev->sdev_gendev.type = &scsi_dev_type; |
1113 | dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d", |
1114 | sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); |
1115 | |
1116 | device_initialize(&sdev->sdev_dev); |
1117 | sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev); |
1118 | sdev->sdev_dev.class = &sdev_class; |
1119 | dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d", |
1120 | sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); |
1121 | sdev->scsi_level = starget->scsi_level; |
1122 | transport_setup_device(&sdev->sdev_gendev); |
1123 | spin_lock_irqsave(shost->host_lock, flags); |
1124 | list_add_tail(&sdev->same_target_siblings, &starget->devices); |
1125 | list_add_tail(&sdev->siblings, &shost->__devices); |
1126 | spin_unlock_irqrestore(shost->host_lock, flags); |
1127 | } |
1128 | |
1129 | int scsi_is_sdev_device(const struct device *dev) |
1130 | { |
1131 | return dev->type == &scsi_dev_type; |
1132 | } |
1133 | EXPORT_SYMBOL(scsi_is_sdev_device); |
1134 | |
1135 | /* A blank transport template that is used in drivers that don't |
1136 | * yet implement Transport Attributes */ |
1137 | struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; |
1138 |
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