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55716d26 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * kernel/power/main.c - PM subsystem core functionality. | |
4 | * | |
5 | * Copyright (c) 2003 Patrick Mochel | |
6 | * Copyright (c) 2003 Open Source Development Lab | |
1da177e4 LT |
7 | */ |
8 | ||
6e5fdeed | 9 | #include <linux/export.h> |
1da177e4 LT |
10 | #include <linux/kobject.h> |
11 | #include <linux/string.h> | |
431d452a | 12 | #include <linux/pm-trace.h> |
5e928f77 | 13 | #include <linux/workqueue.h> |
2a77c46d SL |
14 | #include <linux/debugfs.h> |
15 | #include <linux/seq_file.h> | |
55f2503c | 16 | #include <linux/suspend.h> |
b5dee313 | 17 | #include <linux/syscalls.h> |
f49249d5 | 18 | #include <linux/pm_runtime.h> |
1da177e4 LT |
19 | |
20 | #include "power.h" | |
21 | ||
cd51e61c RW |
22 | #ifdef CONFIG_PM_SLEEP |
23 | ||
4bf236a3 BVA |
24 | void lock_system_sleep(void) |
25 | { | |
26 | current->flags |= PF_FREEZER_SKIP; | |
55f2503c | 27 | mutex_lock(&system_transition_mutex); |
4bf236a3 BVA |
28 | } |
29 | EXPORT_SYMBOL_GPL(lock_system_sleep); | |
30 | ||
31 | void unlock_system_sleep(void) | |
32 | { | |
33 | /* | |
34 | * Don't use freezer_count() because we don't want the call to | |
35 | * try_to_freeze() here. | |
36 | * | |
37 | * Reason: | |
38 | * Fundamentally, we just don't need it, because freezing condition | |
55f2503c PL |
39 | * doesn't come into effect until we release the |
40 | * system_transition_mutex lock, since the freezer always works with | |
41 | * system_transition_mutex held. | |
4bf236a3 BVA |
42 | * |
43 | * More importantly, in the case of hibernation, | |
44 | * unlock_system_sleep() gets called in snapshot_read() and | |
45 | * snapshot_write() when the freezing condition is still in effect. | |
46 | * Which means, if we use try_to_freeze() here, it would make them | |
47 | * enter the refrigerator, thus causing hibernation to lockup. | |
48 | */ | |
49 | current->flags &= ~PF_FREEZER_SKIP; | |
55f2503c | 50 | mutex_unlock(&system_transition_mutex); |
4bf236a3 BVA |
51 | } |
52 | EXPORT_SYMBOL_GPL(unlock_system_sleep); | |
53 | ||
b5dee313 HP |
54 | void ksys_sync_helper(void) |
55 | { | |
c64546b1 HP |
56 | ktime_t start; |
57 | long elapsed_msecs; | |
58 | ||
59 | start = ktime_get(); | |
b5dee313 | 60 | ksys_sync(); |
c64546b1 HP |
61 | elapsed_msecs = ktime_to_ms(ktime_sub(ktime_get(), start)); |
62 | pr_info("Filesystems sync: %ld.%03ld seconds\n", | |
63 | elapsed_msecs / MSEC_PER_SEC, elapsed_msecs % MSEC_PER_SEC); | |
b5dee313 HP |
64 | } |
65 | EXPORT_SYMBOL_GPL(ksys_sync_helper); | |
66 | ||
82525756 AS |
67 | /* Routines for PM-transition notifications */ |
68 | ||
69 | static BLOCKING_NOTIFIER_HEAD(pm_chain_head); | |
70 | ||
71 | int register_pm_notifier(struct notifier_block *nb) | |
72 | { | |
73 | return blocking_notifier_chain_register(&pm_chain_head, nb); | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(register_pm_notifier); | |
76 | ||
77 | int unregister_pm_notifier(struct notifier_block *nb) | |
78 | { | |
79 | return blocking_notifier_chain_unregister(&pm_chain_head, nb); | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(unregister_pm_notifier); | |
82 | ||
70d93298 | 83 | int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down) |
82525756 | 84 | { |
ea00f4f4 LW |
85 | int ret; |
86 | ||
70d93298 | 87 | ret = blocking_notifier_call_chain_robust(&pm_chain_head, val_up, val_down, NULL); |
f0c077a8 AM |
88 | |
89 | return notifier_to_errno(ret); | |
82525756 | 90 | } |
70d93298 | 91 | |
ea00f4f4 LW |
92 | int pm_notifier_call_chain(unsigned long val) |
93 | { | |
70d93298 | 94 | return blocking_notifier_call_chain(&pm_chain_head, val, NULL); |
ea00f4f4 | 95 | } |
82525756 | 96 | |
0e06b4a8 RW |
97 | /* If set, devices may be suspended and resumed asynchronously. */ |
98 | int pm_async_enabled = 1; | |
99 | ||
100 | static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, | |
101 | char *buf) | |
102 | { | |
103 | return sprintf(buf, "%d\n", pm_async_enabled); | |
104 | } | |
105 | ||
106 | static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, | |
107 | const char *buf, size_t n) | |
108 | { | |
109 | unsigned long val; | |
110 | ||
883ee4f7 | 111 | if (kstrtoul(buf, 10, &val)) |
0e06b4a8 RW |
112 | return -EINVAL; |
113 | ||
114 | if (val > 1) | |
115 | return -EINVAL; | |
116 | ||
117 | pm_async_enabled = val; | |
118 | return n; | |
119 | } | |
120 | ||
121 | power_attr(pm_async); | |
122 | ||
406e7938 RW |
123 | #ifdef CONFIG_SUSPEND |
124 | static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, | |
125 | char *buf) | |
126 | { | |
127 | char *s = buf; | |
128 | suspend_state_t i; | |
129 | ||
130 | for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) | |
131 | if (mem_sleep_states[i]) { | |
132 | const char *label = mem_sleep_states[i]; | |
133 | ||
134 | if (mem_sleep_current == i) | |
135 | s += sprintf(s, "[%s] ", label); | |
136 | else | |
137 | s += sprintf(s, "%s ", label); | |
138 | } | |
139 | ||
140 | /* Convert the last space to a newline if needed. */ | |
141 | if (s != buf) | |
142 | *(s-1) = '\n'; | |
143 | ||
144 | return (s - buf); | |
145 | } | |
146 | ||
147 | static suspend_state_t decode_suspend_state(const char *buf, size_t n) | |
148 | { | |
149 | suspend_state_t state; | |
150 | char *p; | |
151 | int len; | |
152 | ||
153 | p = memchr(buf, '\n', n); | |
154 | len = p ? p - buf : n; | |
155 | ||
156 | for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { | |
157 | const char *label = mem_sleep_states[state]; | |
158 | ||
159 | if (label && len == strlen(label) && !strncmp(buf, label, len)) | |
160 | return state; | |
161 | } | |
162 | ||
163 | return PM_SUSPEND_ON; | |
164 | } | |
165 | ||
166 | static ssize_t mem_sleep_store(struct kobject *kobj, struct kobj_attribute *attr, | |
167 | const char *buf, size_t n) | |
168 | { | |
169 | suspend_state_t state; | |
170 | int error; | |
171 | ||
172 | error = pm_autosleep_lock(); | |
173 | if (error) | |
174 | return error; | |
175 | ||
176 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
177 | error = -EBUSY; | |
178 | goto out; | |
179 | } | |
180 | ||
181 | state = decode_suspend_state(buf, n); | |
182 | if (state < PM_SUSPEND_MAX && state > PM_SUSPEND_ON) | |
183 | mem_sleep_current = state; | |
184 | else | |
185 | error = -EINVAL; | |
186 | ||
187 | out: | |
188 | pm_autosleep_unlock(); | |
189 | return error ? error : n; | |
190 | } | |
191 | ||
192 | power_attr(mem_sleep); | |
c052bf82 JM |
193 | |
194 | /* | |
195 | * sync_on_suspend: invoke ksys_sync_helper() before suspend. | |
196 | * | |
197 | * show() returns whether ksys_sync_helper() is invoked before suspend. | |
198 | * store() accepts 0 or 1. 0 disables ksys_sync_helper() and 1 enables it. | |
199 | */ | |
200 | bool sync_on_suspend_enabled = !IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC); | |
201 | ||
202 | static ssize_t sync_on_suspend_show(struct kobject *kobj, | |
203 | struct kobj_attribute *attr, char *buf) | |
204 | { | |
205 | return sprintf(buf, "%d\n", sync_on_suspend_enabled); | |
206 | } | |
207 | ||
208 | static ssize_t sync_on_suspend_store(struct kobject *kobj, | |
209 | struct kobj_attribute *attr, | |
210 | const char *buf, size_t n) | |
211 | { | |
212 | unsigned long val; | |
213 | ||
214 | if (kstrtoul(buf, 10, &val)) | |
215 | return -EINVAL; | |
216 | ||
217 | if (val > 1) | |
218 | return -EINVAL; | |
219 | ||
220 | sync_on_suspend_enabled = !!val; | |
221 | return n; | |
222 | } | |
223 | ||
224 | power_attr(sync_on_suspend); | |
406e7938 RW |
225 | #endif /* CONFIG_SUSPEND */ |
226 | ||
e516a1db | 227 | #ifdef CONFIG_PM_SLEEP_DEBUG |
0e7d56e3 RW |
228 | int pm_test_level = TEST_NONE; |
229 | ||
0e7d56e3 RW |
230 | static const char * const pm_tests[__TEST_AFTER_LAST] = { |
231 | [TEST_NONE] = "none", | |
232 | [TEST_CORE] = "core", | |
233 | [TEST_CPUS] = "processors", | |
234 | [TEST_PLATFORM] = "platform", | |
235 | [TEST_DEVICES] = "devices", | |
236 | [TEST_FREEZER] = "freezer", | |
237 | }; | |
238 | ||
039a75c6 RW |
239 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
240 | char *buf) | |
0e7d56e3 RW |
241 | { |
242 | char *s = buf; | |
243 | int level; | |
244 | ||
245 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
246 | if (pm_tests[level]) { | |
247 | if (level == pm_test_level) | |
248 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
249 | else | |
250 | s += sprintf(s, "%s ", pm_tests[level]); | |
251 | } | |
252 | ||
253 | if (s != buf) | |
254 | /* convert the last space to a newline */ | |
255 | *(s-1) = '\n'; | |
256 | ||
257 | return (s - buf); | |
258 | } | |
259 | ||
039a75c6 RW |
260 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
261 | const char *buf, size_t n) | |
0e7d56e3 RW |
262 | { |
263 | const char * const *s; | |
264 | int level; | |
265 | char *p; | |
266 | int len; | |
267 | int error = -EINVAL; | |
268 | ||
269 | p = memchr(buf, '\n', n); | |
270 | len = p ? p - buf : n; | |
271 | ||
bcda53fa | 272 | lock_system_sleep(); |
0e7d56e3 RW |
273 | |
274 | level = TEST_FIRST; | |
275 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
276 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
277 | pm_test_level = level; | |
278 | error = 0; | |
279 | break; | |
280 | } | |
281 | ||
bcda53fa | 282 | unlock_system_sleep(); |
0e7d56e3 RW |
283 | |
284 | return error ? error : n; | |
285 | } | |
286 | ||
287 | power_attr(pm_test); | |
e516a1db | 288 | #endif /* CONFIG_PM_SLEEP_DEBUG */ |
0e7d56e3 | 289 | |
2a77c46d SL |
290 | static char *suspend_step_name(enum suspend_stat_step step) |
291 | { | |
292 | switch (step) { | |
293 | case SUSPEND_FREEZE: | |
294 | return "freeze"; | |
295 | case SUSPEND_PREPARE: | |
296 | return "prepare"; | |
297 | case SUSPEND_SUSPEND: | |
298 | return "suspend"; | |
299 | case SUSPEND_SUSPEND_NOIRQ: | |
300 | return "suspend_noirq"; | |
301 | case SUSPEND_RESUME_NOIRQ: | |
302 | return "resume_noirq"; | |
303 | case SUSPEND_RESUME: | |
304 | return "resume"; | |
305 | default: | |
306 | return ""; | |
307 | } | |
308 | } | |
309 | ||
2c8db5be KS |
310 | #define suspend_attr(_name) \ |
311 | static ssize_t _name##_show(struct kobject *kobj, \ | |
312 | struct kobj_attribute *attr, char *buf) \ | |
313 | { \ | |
314 | return sprintf(buf, "%d\n", suspend_stats._name); \ | |
315 | } \ | |
316 | static struct kobj_attribute _name = __ATTR_RO(_name) | |
317 | ||
318 | suspend_attr(success); | |
319 | suspend_attr(fail); | |
320 | suspend_attr(failed_freeze); | |
321 | suspend_attr(failed_prepare); | |
322 | suspend_attr(failed_suspend); | |
323 | suspend_attr(failed_suspend_late); | |
324 | suspend_attr(failed_suspend_noirq); | |
325 | suspend_attr(failed_resume); | |
326 | suspend_attr(failed_resume_early); | |
327 | suspend_attr(failed_resume_noirq); | |
328 | ||
329 | static ssize_t last_failed_dev_show(struct kobject *kobj, | |
330 | struct kobj_attribute *attr, char *buf) | |
331 | { | |
332 | int index; | |
333 | char *last_failed_dev = NULL; | |
334 | ||
335 | index = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; | |
336 | index %= REC_FAILED_NUM; | |
337 | last_failed_dev = suspend_stats.failed_devs[index]; | |
338 | ||
339 | return sprintf(buf, "%s\n", last_failed_dev); | |
340 | } | |
341 | static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev); | |
342 | ||
343 | static ssize_t last_failed_errno_show(struct kobject *kobj, | |
344 | struct kobj_attribute *attr, char *buf) | |
345 | { | |
346 | int index; | |
347 | int last_failed_errno; | |
348 | ||
349 | index = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; | |
350 | index %= REC_FAILED_NUM; | |
351 | last_failed_errno = suspend_stats.errno[index]; | |
352 | ||
353 | return sprintf(buf, "%d\n", last_failed_errno); | |
354 | } | |
355 | static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno); | |
356 | ||
357 | static ssize_t last_failed_step_show(struct kobject *kobj, | |
358 | struct kobj_attribute *attr, char *buf) | |
359 | { | |
360 | int index; | |
361 | enum suspend_stat_step step; | |
362 | char *last_failed_step = NULL; | |
363 | ||
364 | index = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; | |
365 | index %= REC_FAILED_NUM; | |
366 | step = suspend_stats.failed_steps[index]; | |
367 | last_failed_step = suspend_step_name(step); | |
368 | ||
369 | return sprintf(buf, "%s\n", last_failed_step); | |
370 | } | |
371 | static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step); | |
372 | ||
373 | static struct attribute *suspend_attrs[] = { | |
374 | &success.attr, | |
375 | &fail.attr, | |
376 | &failed_freeze.attr, | |
377 | &failed_prepare.attr, | |
378 | &failed_suspend.attr, | |
379 | &failed_suspend_late.attr, | |
380 | &failed_suspend_noirq.attr, | |
381 | &failed_resume.attr, | |
382 | &failed_resume_early.attr, | |
383 | &failed_resume_noirq.attr, | |
384 | &last_failed_dev.attr, | |
385 | &last_failed_errno.attr, | |
386 | &last_failed_step.attr, | |
387 | NULL, | |
388 | }; | |
389 | ||
390 | static struct attribute_group suspend_attr_group = { | |
391 | .name = "suspend_stats", | |
392 | .attrs = suspend_attrs, | |
393 | }; | |
394 | ||
395 | #ifdef CONFIG_DEBUG_FS | |
2a77c46d SL |
396 | static int suspend_stats_show(struct seq_file *s, void *unused) |
397 | { | |
398 | int i, index, last_dev, last_errno, last_step; | |
399 | ||
400 | last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; | |
401 | last_dev %= REC_FAILED_NUM; | |
402 | last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; | |
403 | last_errno %= REC_FAILED_NUM; | |
404 | last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; | |
405 | last_step %= REC_FAILED_NUM; | |
cf579dfb RW |
406 | seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n" |
407 | "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n", | |
2a77c46d SL |
408 | "success", suspend_stats.success, |
409 | "fail", suspend_stats.fail, | |
410 | "failed_freeze", suspend_stats.failed_freeze, | |
411 | "failed_prepare", suspend_stats.failed_prepare, | |
412 | "failed_suspend", suspend_stats.failed_suspend, | |
cf579dfb RW |
413 | "failed_suspend_late", |
414 | suspend_stats.failed_suspend_late, | |
2a77c46d SL |
415 | "failed_suspend_noirq", |
416 | suspend_stats.failed_suspend_noirq, | |
417 | "failed_resume", suspend_stats.failed_resume, | |
cf579dfb RW |
418 | "failed_resume_early", |
419 | suspend_stats.failed_resume_early, | |
2a77c46d SL |
420 | "failed_resume_noirq", |
421 | suspend_stats.failed_resume_noirq); | |
422 | seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", | |
423 | suspend_stats.failed_devs[last_dev]); | |
424 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
425 | index = last_dev + REC_FAILED_NUM - i; | |
426 | index %= REC_FAILED_NUM; | |
427 | seq_printf(s, "\t\t\t%-s\n", | |
428 | suspend_stats.failed_devs[index]); | |
429 | } | |
430 | seq_printf(s, " last_failed_errno:\t%-d\n", | |
431 | suspend_stats.errno[last_errno]); | |
432 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
433 | index = last_errno + REC_FAILED_NUM - i; | |
434 | index %= REC_FAILED_NUM; | |
435 | seq_printf(s, "\t\t\t%-d\n", | |
436 | suspend_stats.errno[index]); | |
437 | } | |
438 | seq_printf(s, " last_failed_step:\t%-s\n", | |
439 | suspend_step_name( | |
440 | suspend_stats.failed_steps[last_step])); | |
441 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
442 | index = last_step + REC_FAILED_NUM - i; | |
443 | index %= REC_FAILED_NUM; | |
444 | seq_printf(s, "\t\t\t%-s\n", | |
445 | suspend_step_name( | |
446 | suspend_stats.failed_steps[index])); | |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
943a10f8 | 451 | DEFINE_SHOW_ATTRIBUTE(suspend_stats); |
2a77c46d SL |
452 | |
453 | static int __init pm_debugfs_init(void) | |
454 | { | |
455 | debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, | |
943a10f8 | 456 | NULL, NULL, &suspend_stats_fops); |
2a77c46d SL |
457 | return 0; |
458 | } | |
459 | ||
460 | late_initcall(pm_debugfs_init); | |
461 | #endif /* CONFIG_DEBUG_FS */ | |
462 | ||
ca123102 RW |
463 | #endif /* CONFIG_PM_SLEEP */ |
464 | ||
b2df1d4f RW |
465 | #ifdef CONFIG_PM_SLEEP_DEBUG |
466 | /* | |
467 | * pm_print_times: print time taken by devices to suspend and resume. | |
468 | * | |
469 | * show() returns whether printing of suspend and resume times is enabled. | |
470 | * store() accepts 0 or 1. 0 disables printing and 1 enables it. | |
471 | */ | |
472 | bool pm_print_times_enabled; | |
473 | ||
474 | static ssize_t pm_print_times_show(struct kobject *kobj, | |
475 | struct kobj_attribute *attr, char *buf) | |
476 | { | |
477 | return sprintf(buf, "%d\n", pm_print_times_enabled); | |
478 | } | |
479 | ||
480 | static ssize_t pm_print_times_store(struct kobject *kobj, | |
481 | struct kobj_attribute *attr, | |
482 | const char *buf, size_t n) | |
483 | { | |
484 | unsigned long val; | |
485 | ||
486 | if (kstrtoul(buf, 10, &val)) | |
487 | return -EINVAL; | |
488 | ||
489 | if (val > 1) | |
490 | return -EINVAL; | |
491 | ||
492 | pm_print_times_enabled = !!val; | |
493 | return n; | |
494 | } | |
495 | ||
496 | power_attr(pm_print_times); | |
497 | ||
498 | static inline void pm_print_times_init(void) | |
499 | { | |
500 | pm_print_times_enabled = !!initcall_debug; | |
501 | } | |
a6f5f0dd AY |
502 | |
503 | static ssize_t pm_wakeup_irq_show(struct kobject *kobj, | |
504 | struct kobj_attribute *attr, | |
505 | char *buf) | |
506 | { | |
507 | return pm_wakeup_irq ? sprintf(buf, "%u\n", pm_wakeup_irq) : -ENODATA; | |
508 | } | |
509 | ||
a1e9ca69 | 510 | power_attr_ro(pm_wakeup_irq); |
a6f5f0dd | 511 | |
726fb6b4 | 512 | bool pm_debug_messages_on __read_mostly; |
8d8b2441 RW |
513 | |
514 | static ssize_t pm_debug_messages_show(struct kobject *kobj, | |
515 | struct kobj_attribute *attr, char *buf) | |
516 | { | |
517 | return sprintf(buf, "%d\n", pm_debug_messages_on); | |
518 | } | |
519 | ||
520 | static ssize_t pm_debug_messages_store(struct kobject *kobj, | |
521 | struct kobj_attribute *attr, | |
522 | const char *buf, size_t n) | |
523 | { | |
524 | unsigned long val; | |
525 | ||
526 | if (kstrtoul(buf, 10, &val)) | |
527 | return -EINVAL; | |
528 | ||
529 | if (val > 1) | |
530 | return -EINVAL; | |
531 | ||
532 | pm_debug_messages_on = !!val; | |
533 | return n; | |
534 | } | |
535 | ||
536 | power_attr(pm_debug_messages); | |
537 | ||
db96a759 CY |
538 | static int __init pm_debug_messages_setup(char *str) |
539 | { | |
540 | pm_debug_messages_on = true; | |
541 | return 1; | |
542 | } | |
543 | __setup("pm_debug_messages", pm_debug_messages_setup); | |
544 | ||
8d8b2441 | 545 | /** |
cb08e035 RW |
546 | * __pm_pr_dbg - Print a suspend debug message to the kernel log. |
547 | * @defer: Whether or not to use printk_deferred() to print the message. | |
8d8b2441 RW |
548 | * @fmt: Message format. |
549 | * | |
550 | * The message will be emitted if enabled through the pm_debug_messages | |
551 | * sysfs attribute. | |
552 | */ | |
cb08e035 | 553 | void __pm_pr_dbg(bool defer, const char *fmt, ...) |
8d8b2441 RW |
554 | { |
555 | struct va_format vaf; | |
556 | va_list args; | |
557 | ||
558 | if (!pm_debug_messages_on) | |
559 | return; | |
560 | ||
561 | va_start(args, fmt); | |
562 | ||
563 | vaf.fmt = fmt; | |
564 | vaf.va = &args; | |
565 | ||
cb08e035 RW |
566 | if (defer) |
567 | printk_deferred(KERN_DEBUG "PM: %pV", &vaf); | |
568 | else | |
569 | printk(KERN_DEBUG "PM: %pV", &vaf); | |
8d8b2441 RW |
570 | |
571 | va_end(args); | |
572 | } | |
573 | ||
819b1bb3 | 574 | #else /* !CONFIG_PM_SLEEP_DEBUG */ |
b2df1d4f RW |
575 | static inline void pm_print_times_init(void) {} |
576 | #endif /* CONFIG_PM_SLEEP_DEBUG */ | |
577 | ||
d76e15fb | 578 | struct kobject *power_kobj; |
1da177e4 LT |
579 | |
580 | /** | |
0399d4db | 581 | * state - control system sleep states. |
1da177e4 | 582 | * |
0399d4db | 583 | * show() returns available sleep state labels, which may be "mem", "standby", |
44348e8a MCC |
584 | * "freeze" and "disk" (hibernation). |
585 | * See Documentation/admin-guide/pm/sleep-states.rst for a description of | |
586 | * what they mean. | |
1da177e4 | 587 | * |
0399d4db RW |
588 | * store() accepts one of those strings, translates it into the proper |
589 | * enumerated value, and initiates a suspend transition. | |
1da177e4 | 590 | */ |
386f275f KS |
591 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
592 | char *buf) | |
1da177e4 | 593 | { |
296699de RW |
594 | char *s = buf; |
595 | #ifdef CONFIG_SUSPEND | |
27ddcc65 RW |
596 | suspend_state_t i; |
597 | ||
598 | for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) | |
d431cbc5 RW |
599 | if (pm_states[i]) |
600 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 601 | |
296699de | 602 | #endif |
a6e15a39 KC |
603 | if (hibernation_available()) |
604 | s += sprintf(s, "disk "); | |
a3d25c27 RW |
605 | if (s != buf) |
606 | /* convert the last space to a newline */ | |
607 | *(s-1) = '\n'; | |
1da177e4 LT |
608 | return (s - buf); |
609 | } | |
610 | ||
7483b4a4 | 611 | static suspend_state_t decode_state(const char *buf, size_t n) |
1da177e4 | 612 | { |
296699de | 613 | #ifdef CONFIG_SUSPEND |
d431cbc5 | 614 | suspend_state_t state; |
296699de | 615 | #endif |
1da177e4 | 616 | char *p; |
1da177e4 LT |
617 | int len; |
618 | ||
619 | p = memchr(buf, '\n', n); | |
620 | len = p ? p - buf : n; | |
621 | ||
7483b4a4 | 622 | /* Check hibernation first. */ |
d30bdfc0 | 623 | if (len == 4 && str_has_prefix(buf, "disk")) |
7483b4a4 | 624 | return PM_SUSPEND_MAX; |
a3d25c27 | 625 | |
296699de | 626 | #ifdef CONFIG_SUSPEND |
d431cbc5 RW |
627 | for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { |
628 | const char *label = pm_states[state]; | |
629 | ||
630 | if (label && len == strlen(label) && !strncmp(buf, label, len)) | |
631 | return state; | |
632 | } | |
296699de RW |
633 | #endif |
634 | ||
7483b4a4 RW |
635 | return PM_SUSPEND_ON; |
636 | } | |
637 | ||
638 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, | |
639 | const char *buf, size_t n) | |
640 | { | |
641 | suspend_state_t state; | |
642 | int error; | |
643 | ||
644 | error = pm_autosleep_lock(); | |
645 | if (error) | |
646 | return error; | |
647 | ||
648 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
649 | error = -EBUSY; | |
650 | goto out; | |
651 | } | |
652 | ||
653 | state = decode_state(buf, n); | |
406e7938 RW |
654 | if (state < PM_SUSPEND_MAX) { |
655 | if (state == PM_SUSPEND_MEM) | |
656 | state = mem_sleep_current; | |
657 | ||
7483b4a4 | 658 | error = pm_suspend(state); |
406e7938 | 659 | } else if (state == PM_SUSPEND_MAX) { |
7483b4a4 | 660 | error = hibernate(); |
406e7938 | 661 | } else { |
7483b4a4 | 662 | error = -EINVAL; |
406e7938 | 663 | } |
7483b4a4 RW |
664 | |
665 | out: | |
666 | pm_autosleep_unlock(); | |
1da177e4 LT |
667 | return error ? error : n; |
668 | } | |
669 | ||
670 | power_attr(state); | |
671 | ||
c125e96f RW |
672 | #ifdef CONFIG_PM_SLEEP |
673 | /* | |
674 | * The 'wakeup_count' attribute, along with the functions defined in | |
675 | * drivers/base/power/wakeup.c, provides a means by which wakeup events can be | |
676 | * handled in a non-racy way. | |
677 | * | |
678 | * If a wakeup event occurs when the system is in a sleep state, it simply is | |
679 | * woken up. In turn, if an event that would wake the system up from a sleep | |
680 | * state occurs when it is undergoing a transition to that sleep state, the | |
681 | * transition should be aborted. Moreover, if such an event occurs when the | |
682 | * system is in the working state, an attempt to start a transition to the | |
683 | * given sleep state should fail during certain period after the detection of | |
684 | * the event. Using the 'state' attribute alone is not sufficient to satisfy | |
685 | * these requirements, because a wakeup event may occur exactly when 'state' | |
686 | * is being written to and may be delivered to user space right before it is | |
687 | * frozen, so the event will remain only partially processed until the system is | |
688 | * woken up by another event. In particular, it won't cause the transition to | |
689 | * a sleep state to be aborted. | |
690 | * | |
691 | * This difficulty may be overcome if user space uses 'wakeup_count' before | |
692 | * writing to 'state'. It first should read from 'wakeup_count' and store | |
693 | * the read value. Then, after carrying out its own preparations for the system | |
694 | * transition to a sleep state, it should write the stored value to | |
25985edc | 695 | * 'wakeup_count'. If that fails, at least one wakeup event has occurred since |
c125e96f RW |
696 | * 'wakeup_count' was read and 'state' should not be written to. Otherwise, it |
697 | * is allowed to write to 'state', but the transition will be aborted if there | |
698 | * are any wakeup events detected after 'wakeup_count' was written to. | |
699 | */ | |
700 | ||
701 | static ssize_t wakeup_count_show(struct kobject *kobj, | |
702 | struct kobj_attribute *attr, | |
703 | char *buf) | |
704 | { | |
074037ec | 705 | unsigned int val; |
c125e96f | 706 | |
7483b4a4 RW |
707 | return pm_get_wakeup_count(&val, true) ? |
708 | sprintf(buf, "%u\n", val) : -EINTR; | |
c125e96f RW |
709 | } |
710 | ||
711 | static ssize_t wakeup_count_store(struct kobject *kobj, | |
712 | struct kobj_attribute *attr, | |
713 | const char *buf, size_t n) | |
714 | { | |
074037ec | 715 | unsigned int val; |
7483b4a4 RW |
716 | int error; |
717 | ||
718 | error = pm_autosleep_lock(); | |
719 | if (error) | |
720 | return error; | |
c125e96f | 721 | |
7483b4a4 RW |
722 | if (pm_autosleep_state() > PM_SUSPEND_ON) { |
723 | error = -EBUSY; | |
724 | goto out; | |
725 | } | |
726 | ||
727 | error = -EINVAL; | |
074037ec | 728 | if (sscanf(buf, "%u", &val) == 1) { |
c125e96f | 729 | if (pm_save_wakeup_count(val)) |
7483b4a4 | 730 | error = n; |
bb177fed JW |
731 | else |
732 | pm_print_active_wakeup_sources(); | |
c125e96f | 733 | } |
7483b4a4 RW |
734 | |
735 | out: | |
736 | pm_autosleep_unlock(); | |
737 | return error; | |
c125e96f RW |
738 | } |
739 | ||
740 | power_attr(wakeup_count); | |
7483b4a4 RW |
741 | |
742 | #ifdef CONFIG_PM_AUTOSLEEP | |
743 | static ssize_t autosleep_show(struct kobject *kobj, | |
744 | struct kobj_attribute *attr, | |
745 | char *buf) | |
746 | { | |
747 | suspend_state_t state = pm_autosleep_state(); | |
748 | ||
749 | if (state == PM_SUSPEND_ON) | |
750 | return sprintf(buf, "off\n"); | |
751 | ||
752 | #ifdef CONFIG_SUSPEND | |
753 | if (state < PM_SUSPEND_MAX) | |
d431cbc5 RW |
754 | return sprintf(buf, "%s\n", pm_states[state] ? |
755 | pm_states[state] : "error"); | |
7483b4a4 RW |
756 | #endif |
757 | #ifdef CONFIG_HIBERNATION | |
758 | return sprintf(buf, "disk\n"); | |
759 | #else | |
760 | return sprintf(buf, "error"); | |
761 | #endif | |
762 | } | |
763 | ||
764 | static ssize_t autosleep_store(struct kobject *kobj, | |
765 | struct kobj_attribute *attr, | |
766 | const char *buf, size_t n) | |
767 | { | |
768 | suspend_state_t state = decode_state(buf, n); | |
769 | int error; | |
770 | ||
771 | if (state == PM_SUSPEND_ON | |
040e5bf6 | 772 | && strcmp(buf, "off") && strcmp(buf, "off\n")) |
7483b4a4 RW |
773 | return -EINVAL; |
774 | ||
406e7938 RW |
775 | if (state == PM_SUSPEND_MEM) |
776 | state = mem_sleep_current; | |
777 | ||
7483b4a4 RW |
778 | error = pm_autosleep_set_state(state); |
779 | return error ? error : n; | |
780 | } | |
781 | ||
782 | power_attr(autosleep); | |
783 | #endif /* CONFIG_PM_AUTOSLEEP */ | |
b86ff982 RW |
784 | |
785 | #ifdef CONFIG_PM_WAKELOCKS | |
786 | static ssize_t wake_lock_show(struct kobject *kobj, | |
787 | struct kobj_attribute *attr, | |
788 | char *buf) | |
789 | { | |
790 | return pm_show_wakelocks(buf, true); | |
791 | } | |
792 | ||
793 | static ssize_t wake_lock_store(struct kobject *kobj, | |
794 | struct kobj_attribute *attr, | |
795 | const char *buf, size_t n) | |
796 | { | |
797 | int error = pm_wake_lock(buf); | |
798 | return error ? error : n; | |
799 | } | |
800 | ||
801 | power_attr(wake_lock); | |
802 | ||
803 | static ssize_t wake_unlock_show(struct kobject *kobj, | |
804 | struct kobj_attribute *attr, | |
805 | char *buf) | |
806 | { | |
807 | return pm_show_wakelocks(buf, false); | |
808 | } | |
809 | ||
810 | static ssize_t wake_unlock_store(struct kobject *kobj, | |
811 | struct kobj_attribute *attr, | |
812 | const char *buf, size_t n) | |
813 | { | |
814 | int error = pm_wake_unlock(buf); | |
815 | return error ? error : n; | |
816 | } | |
817 | ||
818 | power_attr(wake_unlock); | |
819 | ||
820 | #endif /* CONFIG_PM_WAKELOCKS */ | |
c125e96f RW |
821 | #endif /* CONFIG_PM_SLEEP */ |
822 | ||
c5c6ba4e RW |
823 | #ifdef CONFIG_PM_TRACE |
824 | int pm_trace_enabled; | |
825 | ||
386f275f KS |
826 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
827 | char *buf) | |
c5c6ba4e RW |
828 | { |
829 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
830 | } | |
831 | ||
832 | static ssize_t | |
386f275f KS |
833 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
834 | const char *buf, size_t n) | |
c5c6ba4e RW |
835 | { |
836 | int val; | |
837 | ||
838 | if (sscanf(buf, "%d", &val) == 1) { | |
839 | pm_trace_enabled = !!val; | |
9dceefe4 SK |
840 | if (pm_trace_enabled) { |
841 | pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n" | |
842 | "PM: Correct system time has to be restored manually after resume.\n"); | |
843 | } | |
c5c6ba4e RW |
844 | return n; |
845 | } | |
846 | return -EINVAL; | |
847 | } | |
848 | ||
849 | power_attr(pm_trace); | |
d33ac60b JH |
850 | |
851 | static ssize_t pm_trace_dev_match_show(struct kobject *kobj, | |
852 | struct kobj_attribute *attr, | |
853 | char *buf) | |
854 | { | |
855 | return show_trace_dev_match(buf, PAGE_SIZE); | |
856 | } | |
857 | ||
a1e9ca69 | 858 | power_attr_ro(pm_trace_dev_match); |
d33ac60b | 859 | |
0e7d56e3 | 860 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e | 861 | |
957d1282 LF |
862 | #ifdef CONFIG_FREEZER |
863 | static ssize_t pm_freeze_timeout_show(struct kobject *kobj, | |
864 | struct kobj_attribute *attr, char *buf) | |
865 | { | |
866 | return sprintf(buf, "%u\n", freeze_timeout_msecs); | |
867 | } | |
868 | ||
869 | static ssize_t pm_freeze_timeout_store(struct kobject *kobj, | |
870 | struct kobj_attribute *attr, | |
871 | const char *buf, size_t n) | |
872 | { | |
873 | unsigned long val; | |
874 | ||
875 | if (kstrtoul(buf, 10, &val)) | |
876 | return -EINVAL; | |
877 | ||
878 | freeze_timeout_msecs = val; | |
879 | return n; | |
880 | } | |
881 | ||
882 | power_attr(pm_freeze_timeout); | |
883 | ||
884 | #endif /* CONFIG_FREEZER*/ | |
885 | ||
c5c6ba4e RW |
886 | static struct attribute * g[] = { |
887 | &state_attr.attr, | |
0e7d56e3 | 888 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 889 | &pm_trace_attr.attr, |
d33ac60b | 890 | &pm_trace_dev_match_attr.attr, |
0e7d56e3 | 891 | #endif |
0e06b4a8 RW |
892 | #ifdef CONFIG_PM_SLEEP |
893 | &pm_async_attr.attr, | |
c125e96f | 894 | &wakeup_count_attr.attr, |
406e7938 RW |
895 | #ifdef CONFIG_SUSPEND |
896 | &mem_sleep_attr.attr, | |
c052bf82 | 897 | &sync_on_suspend_attr.attr, |
406e7938 | 898 | #endif |
7483b4a4 RW |
899 | #ifdef CONFIG_PM_AUTOSLEEP |
900 | &autosleep_attr.attr, | |
901 | #endif | |
b86ff982 RW |
902 | #ifdef CONFIG_PM_WAKELOCKS |
903 | &wake_lock_attr.attr, | |
904 | &wake_unlock_attr.attr, | |
905 | #endif | |
b2df1d4f | 906 | #ifdef CONFIG_PM_SLEEP_DEBUG |
e516a1db | 907 | &pm_test_attr.attr, |
4b7760ba | 908 | &pm_print_times_attr.attr, |
a6f5f0dd | 909 | &pm_wakeup_irq_attr.attr, |
8d8b2441 | 910 | &pm_debug_messages_attr.attr, |
0e06b4a8 | 911 | #endif |
957d1282 LF |
912 | #endif |
913 | #ifdef CONFIG_FREEZER | |
914 | &pm_freeze_timeout_attr.attr, | |
0e7d56e3 | 915 | #endif |
c5c6ba4e RW |
916 | NULL, |
917 | }; | |
1da177e4 | 918 | |
1d0c6e59 | 919 | static const struct attribute_group attr_group = { |
1da177e4 LT |
920 | .attrs = g, |
921 | }; | |
922 | ||
2c8db5be KS |
923 | static const struct attribute_group *attr_groups[] = { |
924 | &attr_group, | |
925 | #ifdef CONFIG_PM_SLEEP | |
926 | &suspend_attr_group, | |
927 | #endif | |
928 | NULL, | |
929 | }; | |
930 | ||
5e928f77 | 931 | struct workqueue_struct *pm_wq; |
7b199ca2 | 932 | EXPORT_SYMBOL_GPL(pm_wq); |
5e928f77 RW |
933 | |
934 | static int __init pm_start_workqueue(void) | |
935 | { | |
58a69cb4 | 936 | pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); |
5e928f77 RW |
937 | |
938 | return pm_wq ? 0 : -ENOMEM; | |
939 | } | |
5e928f77 | 940 | |
1da177e4 LT |
941 | static int __init pm_init(void) |
942 | { | |
5e928f77 RW |
943 | int error = pm_start_workqueue(); |
944 | if (error) | |
945 | return error; | |
ac5c24ec | 946 | hibernate_image_size_init(); |
ddeb6487 | 947 | hibernate_reserved_size_init(); |
fa7fd6fa | 948 | pm_states_init(); |
d76e15fb GKH |
949 | power_kobj = kobject_create_and_add("power", NULL); |
950 | if (!power_kobj) | |
039a5dcd | 951 | return -ENOMEM; |
2c8db5be | 952 | error = sysfs_create_groups(power_kobj, attr_groups); |
7483b4a4 RW |
953 | if (error) |
954 | return error; | |
b2df1d4f | 955 | pm_print_times_init(); |
7483b4a4 | 956 | return pm_autosleep_init(); |
1da177e4 LT |
957 | } |
958 | ||
959 | core_initcall(pm_init); |