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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 | ||
b52124a7 | 9 | #include <linux/acpi.h> |
6e5fdeed | 10 | #include <linux/export.h> |
1da177e4 LT |
11 | #include <linux/kobject.h> |
12 | #include <linux/string.h> | |
431d452a | 13 | #include <linux/pm-trace.h> |
5e928f77 | 14 | #include <linux/workqueue.h> |
2a77c46d SL |
15 | #include <linux/debugfs.h> |
16 | #include <linux/seq_file.h> | |
55f2503c | 17 | #include <linux/suspend.h> |
b5dee313 | 18 | #include <linux/syscalls.h> |
f49249d5 | 19 | #include <linux/pm_runtime.h> |
1da177e4 LT |
20 | |
21 | #include "power.h" | |
22 | ||
cd51e61c | 23 | #ifdef CONFIG_PM_SLEEP |
07f44ac3 KW |
24 | /* |
25 | * The following functions are used by the suspend/hibernate code to temporarily | |
26 | * change gfp_allowed_mask in order to avoid using I/O during memory allocations | |
27 | * while devices are suspended. To avoid races with the suspend/hibernate code, | |
28 | * they should always be called with system_transition_mutex held | |
29 | * (gfp_allowed_mask also should only be modified with system_transition_mutex | |
30 | * held, unless the suspend/hibernate code is guaranteed not to run in parallel | |
31 | * with that modification). | |
32 | */ | |
33 | static gfp_t saved_gfp_mask; | |
34 | ||
35 | void pm_restore_gfp_mask(void) | |
36 | { | |
37 | WARN_ON(!mutex_is_locked(&system_transition_mutex)); | |
38 | if (saved_gfp_mask) { | |
39 | gfp_allowed_mask = saved_gfp_mask; | |
40 | saved_gfp_mask = 0; | |
41 | } | |
42 | } | |
43 | ||
44 | void pm_restrict_gfp_mask(void) | |
45 | { | |
46 | WARN_ON(!mutex_is_locked(&system_transition_mutex)); | |
47 | WARN_ON(saved_gfp_mask); | |
48 | saved_gfp_mask = gfp_allowed_mask; | |
49 | gfp_allowed_mask &= ~(__GFP_IO | __GFP_FS); | |
50 | } | |
cd51e61c | 51 | |
5950e5d5 | 52 | unsigned int lock_system_sleep(void) |
4bf236a3 | 53 | { |
5950e5d5 | 54 | unsigned int flags = current->flags; |
f5d39b02 | 55 | current->flags |= PF_NOFREEZE; |
55f2503c | 56 | mutex_lock(&system_transition_mutex); |
5950e5d5 | 57 | return flags; |
4bf236a3 BVA |
58 | } |
59 | EXPORT_SYMBOL_GPL(lock_system_sleep); | |
60 | ||
5950e5d5 | 61 | void unlock_system_sleep(unsigned int flags) |
4bf236a3 | 62 | { |
f5d39b02 PZ |
63 | if (!(flags & PF_NOFREEZE)) |
64 | current->flags &= ~PF_NOFREEZE; | |
55f2503c | 65 | mutex_unlock(&system_transition_mutex); |
4bf236a3 BVA |
66 | } |
67 | EXPORT_SYMBOL_GPL(unlock_system_sleep); | |
68 | ||
b5dee313 HP |
69 | void ksys_sync_helper(void) |
70 | { | |
c64546b1 HP |
71 | ktime_t start; |
72 | long elapsed_msecs; | |
73 | ||
74 | start = ktime_get(); | |
b5dee313 | 75 | ksys_sync(); |
c64546b1 HP |
76 | elapsed_msecs = ktime_to_ms(ktime_sub(ktime_get(), start)); |
77 | pr_info("Filesystems sync: %ld.%03ld seconds\n", | |
78 | elapsed_msecs / MSEC_PER_SEC, elapsed_msecs % MSEC_PER_SEC); | |
b5dee313 HP |
79 | } |
80 | EXPORT_SYMBOL_GPL(ksys_sync_helper); | |
81 | ||
82525756 AS |
82 | /* Routines for PM-transition notifications */ |
83 | ||
84 | static BLOCKING_NOTIFIER_HEAD(pm_chain_head); | |
85 | ||
86 | int register_pm_notifier(struct notifier_block *nb) | |
87 | { | |
88 | return blocking_notifier_chain_register(&pm_chain_head, nb); | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(register_pm_notifier); | |
91 | ||
92 | int unregister_pm_notifier(struct notifier_block *nb) | |
93 | { | |
94 | return blocking_notifier_chain_unregister(&pm_chain_head, nb); | |
95 | } | |
96 | EXPORT_SYMBOL_GPL(unregister_pm_notifier); | |
97 | ||
b52124a7 ML |
98 | void pm_report_hw_sleep_time(u64 t) |
99 | { | |
100 | suspend_stats.last_hw_sleep = t; | |
101 | suspend_stats.total_hw_sleep += t; | |
102 | } | |
103 | EXPORT_SYMBOL_GPL(pm_report_hw_sleep_time); | |
104 | ||
105 | void pm_report_max_hw_sleep(u64 t) | |
106 | { | |
107 | suspend_stats.max_hw_sleep = t; | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(pm_report_max_hw_sleep); | |
110 | ||
70d93298 | 111 | int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down) |
82525756 | 112 | { |
ea00f4f4 LW |
113 | int ret; |
114 | ||
70d93298 | 115 | ret = blocking_notifier_call_chain_robust(&pm_chain_head, val_up, val_down, NULL); |
f0c077a8 AM |
116 | |
117 | return notifier_to_errno(ret); | |
82525756 | 118 | } |
70d93298 | 119 | |
ea00f4f4 LW |
120 | int pm_notifier_call_chain(unsigned long val) |
121 | { | |
70d93298 | 122 | return blocking_notifier_call_chain(&pm_chain_head, val, NULL); |
ea00f4f4 | 123 | } |
82525756 | 124 | |
0e06b4a8 RW |
125 | /* If set, devices may be suspended and resumed asynchronously. */ |
126 | int pm_async_enabled = 1; | |
127 | ||
128 | static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, | |
129 | char *buf) | |
130 | { | |
131 | return sprintf(buf, "%d\n", pm_async_enabled); | |
132 | } | |
133 | ||
134 | static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, | |
135 | const char *buf, size_t n) | |
136 | { | |
137 | unsigned long val; | |
138 | ||
883ee4f7 | 139 | if (kstrtoul(buf, 10, &val)) |
0e06b4a8 RW |
140 | return -EINVAL; |
141 | ||
142 | if (val > 1) | |
143 | return -EINVAL; | |
144 | ||
145 | pm_async_enabled = val; | |
146 | return n; | |
147 | } | |
148 | ||
149 | power_attr(pm_async); | |
150 | ||
406e7938 RW |
151 | #ifdef CONFIG_SUSPEND |
152 | static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, | |
153 | char *buf) | |
154 | { | |
155 | char *s = buf; | |
156 | suspend_state_t i; | |
157 | ||
9ea4dcf4 DW |
158 | for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) { |
159 | if (i >= PM_SUSPEND_MEM && cxl_mem_active()) | |
160 | continue; | |
406e7938 RW |
161 | if (mem_sleep_states[i]) { |
162 | const char *label = mem_sleep_states[i]; | |
163 | ||
164 | if (mem_sleep_current == i) | |
165 | s += sprintf(s, "[%s] ", label); | |
166 | else | |
167 | s += sprintf(s, "%s ", label); | |
168 | } | |
9ea4dcf4 | 169 | } |
406e7938 RW |
170 | |
171 | /* Convert the last space to a newline if needed. */ | |
172 | if (s != buf) | |
173 | *(s-1) = '\n'; | |
174 | ||
175 | return (s - buf); | |
176 | } | |
177 | ||
178 | static suspend_state_t decode_suspend_state(const char *buf, size_t n) | |
179 | { | |
180 | suspend_state_t state; | |
181 | char *p; | |
182 | int len; | |
183 | ||
184 | p = memchr(buf, '\n', n); | |
185 | len = p ? p - buf : n; | |
186 | ||
187 | for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { | |
188 | const char *label = mem_sleep_states[state]; | |
189 | ||
190 | if (label && len == strlen(label) && !strncmp(buf, label, len)) | |
191 | return state; | |
192 | } | |
193 | ||
194 | return PM_SUSPEND_ON; | |
195 | } | |
196 | ||
197 | static ssize_t mem_sleep_store(struct kobject *kobj, struct kobj_attribute *attr, | |
198 | const char *buf, size_t n) | |
199 | { | |
200 | suspend_state_t state; | |
201 | int error; | |
202 | ||
203 | error = pm_autosleep_lock(); | |
204 | if (error) | |
205 | return error; | |
206 | ||
207 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
208 | error = -EBUSY; | |
209 | goto out; | |
210 | } | |
211 | ||
212 | state = decode_suspend_state(buf, n); | |
213 | if (state < PM_SUSPEND_MAX && state > PM_SUSPEND_ON) | |
214 | mem_sleep_current = state; | |
215 | else | |
216 | error = -EINVAL; | |
217 | ||
218 | out: | |
219 | pm_autosleep_unlock(); | |
220 | return error ? error : n; | |
221 | } | |
222 | ||
223 | power_attr(mem_sleep); | |
c052bf82 JM |
224 | |
225 | /* | |
226 | * sync_on_suspend: invoke ksys_sync_helper() before suspend. | |
227 | * | |
228 | * show() returns whether ksys_sync_helper() is invoked before suspend. | |
229 | * store() accepts 0 or 1. 0 disables ksys_sync_helper() and 1 enables it. | |
230 | */ | |
231 | bool sync_on_suspend_enabled = !IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC); | |
232 | ||
233 | static ssize_t sync_on_suspend_show(struct kobject *kobj, | |
234 | struct kobj_attribute *attr, char *buf) | |
235 | { | |
236 | return sprintf(buf, "%d\n", sync_on_suspend_enabled); | |
237 | } | |
238 | ||
239 | static ssize_t sync_on_suspend_store(struct kobject *kobj, | |
240 | struct kobj_attribute *attr, | |
241 | const char *buf, size_t n) | |
242 | { | |
243 | unsigned long val; | |
244 | ||
245 | if (kstrtoul(buf, 10, &val)) | |
246 | return -EINVAL; | |
247 | ||
248 | if (val > 1) | |
249 | return -EINVAL; | |
250 | ||
251 | sync_on_suspend_enabled = !!val; | |
252 | return n; | |
253 | } | |
254 | ||
255 | power_attr(sync_on_suspend); | |
406e7938 RW |
256 | #endif /* CONFIG_SUSPEND */ |
257 | ||
e516a1db | 258 | #ifdef CONFIG_PM_SLEEP_DEBUG |
0e7d56e3 RW |
259 | int pm_test_level = TEST_NONE; |
260 | ||
0e7d56e3 RW |
261 | static const char * const pm_tests[__TEST_AFTER_LAST] = { |
262 | [TEST_NONE] = "none", | |
263 | [TEST_CORE] = "core", | |
264 | [TEST_CPUS] = "processors", | |
265 | [TEST_PLATFORM] = "platform", | |
266 | [TEST_DEVICES] = "devices", | |
267 | [TEST_FREEZER] = "freezer", | |
268 | }; | |
269 | ||
039a75c6 RW |
270 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
271 | char *buf) | |
0e7d56e3 RW |
272 | { |
273 | char *s = buf; | |
274 | int level; | |
275 | ||
276 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
277 | if (pm_tests[level]) { | |
278 | if (level == pm_test_level) | |
279 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
280 | else | |
281 | s += sprintf(s, "%s ", pm_tests[level]); | |
282 | } | |
283 | ||
284 | if (s != buf) | |
285 | /* convert the last space to a newline */ | |
286 | *(s-1) = '\n'; | |
287 | ||
288 | return (s - buf); | |
289 | } | |
290 | ||
039a75c6 RW |
291 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
292 | const char *buf, size_t n) | |
0e7d56e3 | 293 | { |
5950e5d5 | 294 | unsigned int sleep_flags; |
0e7d56e3 | 295 | const char * const *s; |
5950e5d5 | 296 | int error = -EINVAL; |
0e7d56e3 RW |
297 | int level; |
298 | char *p; | |
299 | int len; | |
0e7d56e3 RW |
300 | |
301 | p = memchr(buf, '\n', n); | |
302 | len = p ? p - buf : n; | |
303 | ||
5950e5d5 | 304 | sleep_flags = lock_system_sleep(); |
0e7d56e3 RW |
305 | |
306 | level = TEST_FIRST; | |
307 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
308 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
309 | pm_test_level = level; | |
310 | error = 0; | |
311 | break; | |
312 | } | |
313 | ||
5950e5d5 | 314 | unlock_system_sleep(sleep_flags); |
0e7d56e3 RW |
315 | |
316 | return error ? error : n; | |
317 | } | |
318 | ||
319 | power_attr(pm_test); | |
e516a1db | 320 | #endif /* CONFIG_PM_SLEEP_DEBUG */ |
0e7d56e3 | 321 | |
bc88528c RW |
322 | static const char * const suspend_step_names[] = { |
323 | [SUSPEND_WORKING] = "", | |
324 | [SUSPEND_FREEZE] = "freeze", | |
325 | [SUSPEND_PREPARE] = "prepare", | |
326 | [SUSPEND_SUSPEND] = "suspend", | |
327 | [SUSPEND_SUSPEND_LATE] = "suspend_late", | |
328 | [SUSPEND_SUSPEND_NOIRQ] = "suspend_noirq", | |
329 | [SUSPEND_RESUME_NOIRQ] = "resume_noirq", | |
330 | [SUSPEND_RESUME_EARLY] = "resume_early", | |
331 | [SUSPEND_RESUME] = "resume", | |
332 | }; | |
2a77c46d | 333 | |
b52124a7 | 334 | #define suspend_attr(_name, format_str) \ |
2c8db5be KS |
335 | static ssize_t _name##_show(struct kobject *kobj, \ |
336 | struct kobj_attribute *attr, char *buf) \ | |
337 | { \ | |
b52124a7 | 338 | return sprintf(buf, format_str, suspend_stats._name); \ |
2c8db5be KS |
339 | } \ |
340 | static struct kobj_attribute _name = __ATTR_RO(_name) | |
341 | ||
2231f78d RW |
342 | suspend_attr(success, "%u\n"); |
343 | suspend_attr(fail, "%u\n"); | |
b52124a7 ML |
344 | suspend_attr(last_hw_sleep, "%llu\n"); |
345 | suspend_attr(total_hw_sleep, "%llu\n"); | |
346 | suspend_attr(max_hw_sleep, "%llu\n"); | |
2c8db5be | 347 | |
b730bab0 RW |
348 | #define suspend_step_attr(_name, step) \ |
349 | static ssize_t _name##_show(struct kobject *kobj, \ | |
350 | struct kobj_attribute *attr, char *buf) \ | |
351 | { \ | |
352 | return sprintf(buf, "%u\n", \ | |
353 | suspend_stats.step_failures[step-1]); \ | |
354 | } \ | |
355 | static struct kobj_attribute _name = __ATTR_RO(_name) | |
356 | ||
357 | suspend_step_attr(failed_freeze, SUSPEND_FREEZE); | |
358 | suspend_step_attr(failed_prepare, SUSPEND_PREPARE); | |
359 | suspend_step_attr(failed_suspend, SUSPEND_SUSPEND); | |
360 | suspend_step_attr(failed_suspend_late, SUSPEND_SUSPEND_LATE); | |
361 | suspend_step_attr(failed_suspend_noirq, SUSPEND_SUSPEND_NOIRQ); | |
362 | suspend_step_attr(failed_resume, SUSPEND_RESUME); | |
363 | suspend_step_attr(failed_resume_early, SUSPEND_RESUME_EARLY); | |
364 | suspend_step_attr(failed_resume_noirq, SUSPEND_RESUME_NOIRQ); | |
365 | ||
2c8db5be KS |
366 | static ssize_t last_failed_dev_show(struct kobject *kobj, |
367 | struct kobj_attribute *attr, char *buf) | |
368 | { | |
369 | int index; | |
370 | char *last_failed_dev = NULL; | |
371 | ||
372 | index = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; | |
373 | index %= REC_FAILED_NUM; | |
374 | last_failed_dev = suspend_stats.failed_devs[index]; | |
375 | ||
376 | return sprintf(buf, "%s\n", last_failed_dev); | |
377 | } | |
378 | static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev); | |
379 | ||
380 | static ssize_t last_failed_errno_show(struct kobject *kobj, | |
381 | struct kobj_attribute *attr, char *buf) | |
382 | { | |
383 | int index; | |
384 | int last_failed_errno; | |
385 | ||
386 | index = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; | |
387 | index %= REC_FAILED_NUM; | |
388 | last_failed_errno = suspend_stats.errno[index]; | |
389 | ||
390 | return sprintf(buf, "%d\n", last_failed_errno); | |
391 | } | |
392 | static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno); | |
393 | ||
394 | static ssize_t last_failed_step_show(struct kobject *kobj, | |
395 | struct kobj_attribute *attr, char *buf) | |
396 | { | |
2c8db5be | 397 | enum suspend_stat_step step; |
bc88528c | 398 | int index; |
2c8db5be KS |
399 | |
400 | index = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; | |
401 | index %= REC_FAILED_NUM; | |
402 | step = suspend_stats.failed_steps[index]; | |
2c8db5be | 403 | |
bc88528c | 404 | return sprintf(buf, "%s\n", suspend_step_names[step]); |
2c8db5be KS |
405 | } |
406 | static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step); | |
407 | ||
408 | static struct attribute *suspend_attrs[] = { | |
409 | &success.attr, | |
410 | &fail.attr, | |
411 | &failed_freeze.attr, | |
412 | &failed_prepare.attr, | |
413 | &failed_suspend.attr, | |
414 | &failed_suspend_late.attr, | |
415 | &failed_suspend_noirq.attr, | |
416 | &failed_resume.attr, | |
417 | &failed_resume_early.attr, | |
418 | &failed_resume_noirq.attr, | |
419 | &last_failed_dev.attr, | |
420 | &last_failed_errno.attr, | |
421 | &last_failed_step.attr, | |
b52124a7 ML |
422 | &last_hw_sleep.attr, |
423 | &total_hw_sleep.attr, | |
424 | &max_hw_sleep.attr, | |
2c8db5be KS |
425 | NULL, |
426 | }; | |
427 | ||
b52124a7 ML |
428 | static umode_t suspend_attr_is_visible(struct kobject *kobj, struct attribute *attr, int idx) |
429 | { | |
430 | if (attr != &last_hw_sleep.attr && | |
431 | attr != &total_hw_sleep.attr && | |
432 | attr != &max_hw_sleep.attr) | |
433 | return 0444; | |
434 | ||
435 | #ifdef CONFIG_ACPI | |
436 | if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) | |
437 | return 0444; | |
438 | #endif | |
439 | return 0; | |
440 | } | |
441 | ||
15560574 | 442 | static const struct attribute_group suspend_attr_group = { |
2c8db5be KS |
443 | .name = "suspend_stats", |
444 | .attrs = suspend_attrs, | |
b52124a7 | 445 | .is_visible = suspend_attr_is_visible, |
2c8db5be KS |
446 | }; |
447 | ||
448 | #ifdef CONFIG_DEBUG_FS | |
2a77c46d SL |
449 | static int suspend_stats_show(struct seq_file *s, void *unused) |
450 | { | |
451 | int i, index, last_dev, last_errno, last_step; | |
b730bab0 | 452 | enum suspend_stat_step step; |
2a77c46d SL |
453 | |
454 | last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; | |
455 | last_dev %= REC_FAILED_NUM; | |
456 | last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; | |
457 | last_errno %= REC_FAILED_NUM; | |
458 | last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; | |
459 | last_step %= REC_FAILED_NUM; | |
b730bab0 | 460 | |
2231f78d | 461 | seq_printf(s, "success: %u\nfail: %u\n", |
b730bab0 RW |
462 | suspend_stats.success, suspend_stats.fail); |
463 | ||
464 | for (step = SUSPEND_FREEZE; step <= SUSPEND_NR_STEPS; step++) | |
465 | seq_printf(s, "failed_%s: %u\n", suspend_step_names[step], | |
466 | suspend_stats.step_failures[step-1]); | |
467 | ||
2a77c46d | 468 | seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", |
bc88528c | 469 | suspend_stats.failed_devs[last_dev]); |
2a77c46d SL |
470 | for (i = 1; i < REC_FAILED_NUM; i++) { |
471 | index = last_dev + REC_FAILED_NUM - i; | |
472 | index %= REC_FAILED_NUM; | |
bc88528c | 473 | seq_printf(s, "\t\t\t%-s\n", suspend_stats.failed_devs[index]); |
2a77c46d SL |
474 | } |
475 | seq_printf(s, " last_failed_errno:\t%-d\n", | |
476 | suspend_stats.errno[last_errno]); | |
477 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
478 | index = last_errno + REC_FAILED_NUM - i; | |
479 | index %= REC_FAILED_NUM; | |
bc88528c | 480 | seq_printf(s, "\t\t\t%-d\n", suspend_stats.errno[index]); |
2a77c46d SL |
481 | } |
482 | seq_printf(s, " last_failed_step:\t%-s\n", | |
bc88528c | 483 | suspend_step_names[suspend_stats.failed_steps[last_step]]); |
2a77c46d SL |
484 | for (i = 1; i < REC_FAILED_NUM; i++) { |
485 | index = last_step + REC_FAILED_NUM - i; | |
486 | index %= REC_FAILED_NUM; | |
487 | seq_printf(s, "\t\t\t%-s\n", | |
bc88528c | 488 | suspend_step_names[suspend_stats.failed_steps[index]]); |
2a77c46d SL |
489 | } |
490 | ||
491 | return 0; | |
492 | } | |
943a10f8 | 493 | DEFINE_SHOW_ATTRIBUTE(suspend_stats); |
2a77c46d SL |
494 | |
495 | static int __init pm_debugfs_init(void) | |
496 | { | |
497 | debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, | |
943a10f8 | 498 | NULL, NULL, &suspend_stats_fops); |
2a77c46d SL |
499 | return 0; |
500 | } | |
501 | ||
502 | late_initcall(pm_debugfs_init); | |
503 | #endif /* CONFIG_DEBUG_FS */ | |
504 | ||
ca123102 RW |
505 | #endif /* CONFIG_PM_SLEEP */ |
506 | ||
b2df1d4f RW |
507 | #ifdef CONFIG_PM_SLEEP_DEBUG |
508 | /* | |
509 | * pm_print_times: print time taken by devices to suspend and resume. | |
510 | * | |
511 | * show() returns whether printing of suspend and resume times is enabled. | |
512 | * store() accepts 0 or 1. 0 disables printing and 1 enables it. | |
513 | */ | |
514 | bool pm_print_times_enabled; | |
515 | ||
516 | static ssize_t pm_print_times_show(struct kobject *kobj, | |
517 | struct kobj_attribute *attr, char *buf) | |
518 | { | |
519 | return sprintf(buf, "%d\n", pm_print_times_enabled); | |
520 | } | |
521 | ||
522 | static ssize_t pm_print_times_store(struct kobject *kobj, | |
523 | struct kobj_attribute *attr, | |
524 | const char *buf, size_t n) | |
525 | { | |
526 | unsigned long val; | |
527 | ||
528 | if (kstrtoul(buf, 10, &val)) | |
529 | return -EINVAL; | |
530 | ||
531 | if (val > 1) | |
532 | return -EINVAL; | |
533 | ||
534 | pm_print_times_enabled = !!val; | |
535 | return n; | |
536 | } | |
537 | ||
538 | power_attr(pm_print_times); | |
539 | ||
540 | static inline void pm_print_times_init(void) | |
541 | { | |
542 | pm_print_times_enabled = !!initcall_debug; | |
543 | } | |
a6f5f0dd AY |
544 | |
545 | static ssize_t pm_wakeup_irq_show(struct kobject *kobj, | |
546 | struct kobj_attribute *attr, | |
547 | char *buf) | |
548 | { | |
cb1f65c1 RW |
549 | if (!pm_wakeup_irq()) |
550 | return -ENODATA; | |
551 | ||
552 | return sprintf(buf, "%u\n", pm_wakeup_irq()); | |
a6f5f0dd AY |
553 | } |
554 | ||
a1e9ca69 | 555 | power_attr_ro(pm_wakeup_irq); |
a6f5f0dd | 556 | |
726fb6b4 | 557 | bool pm_debug_messages_on __read_mostly; |
8d8b2441 | 558 | |
cdb8c100 ML |
559 | bool pm_debug_messages_should_print(void) |
560 | { | |
561 | return pm_debug_messages_on && pm_suspend_target_state != PM_SUSPEND_ON; | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(pm_debug_messages_should_print); | |
564 | ||
8d8b2441 RW |
565 | static ssize_t pm_debug_messages_show(struct kobject *kobj, |
566 | struct kobj_attribute *attr, char *buf) | |
567 | { | |
568 | return sprintf(buf, "%d\n", pm_debug_messages_on); | |
569 | } | |
570 | ||
571 | static ssize_t pm_debug_messages_store(struct kobject *kobj, | |
572 | struct kobj_attribute *attr, | |
573 | const char *buf, size_t n) | |
574 | { | |
575 | unsigned long val; | |
576 | ||
577 | if (kstrtoul(buf, 10, &val)) | |
578 | return -EINVAL; | |
579 | ||
580 | if (val > 1) | |
581 | return -EINVAL; | |
582 | ||
583 | pm_debug_messages_on = !!val; | |
584 | return n; | |
585 | } | |
586 | ||
587 | power_attr(pm_debug_messages); | |
588 | ||
db96a759 CY |
589 | static int __init pm_debug_messages_setup(char *str) |
590 | { | |
591 | pm_debug_messages_on = true; | |
592 | return 1; | |
593 | } | |
594 | __setup("pm_debug_messages", pm_debug_messages_setup); | |
595 | ||
819b1bb3 | 596 | #else /* !CONFIG_PM_SLEEP_DEBUG */ |
b2df1d4f RW |
597 | static inline void pm_print_times_init(void) {} |
598 | #endif /* CONFIG_PM_SLEEP_DEBUG */ | |
599 | ||
d76e15fb | 600 | struct kobject *power_kobj; |
1da177e4 | 601 | |
dbcfa715 | 602 | /* |
0399d4db | 603 | * state - control system sleep states. |
1da177e4 | 604 | * |
0399d4db | 605 | * show() returns available sleep state labels, which may be "mem", "standby", |
44348e8a MCC |
606 | * "freeze" and "disk" (hibernation). |
607 | * See Documentation/admin-guide/pm/sleep-states.rst for a description of | |
608 | * what they mean. | |
1da177e4 | 609 | * |
0399d4db RW |
610 | * store() accepts one of those strings, translates it into the proper |
611 | * enumerated value, and initiates a suspend transition. | |
1da177e4 | 612 | */ |
386f275f KS |
613 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
614 | char *buf) | |
1da177e4 | 615 | { |
296699de RW |
616 | char *s = buf; |
617 | #ifdef CONFIG_SUSPEND | |
27ddcc65 RW |
618 | suspend_state_t i; |
619 | ||
620 | for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) | |
d431cbc5 RW |
621 | if (pm_states[i]) |
622 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 623 | |
296699de | 624 | #endif |
a6e15a39 KC |
625 | if (hibernation_available()) |
626 | s += sprintf(s, "disk "); | |
a3d25c27 RW |
627 | if (s != buf) |
628 | /* convert the last space to a newline */ | |
629 | *(s-1) = '\n'; | |
1da177e4 LT |
630 | return (s - buf); |
631 | } | |
632 | ||
7483b4a4 | 633 | static suspend_state_t decode_state(const char *buf, size_t n) |
1da177e4 | 634 | { |
296699de | 635 | #ifdef CONFIG_SUSPEND |
d431cbc5 | 636 | suspend_state_t state; |
296699de | 637 | #endif |
1da177e4 | 638 | char *p; |
1da177e4 LT |
639 | int len; |
640 | ||
641 | p = memchr(buf, '\n', n); | |
642 | len = p ? p - buf : n; | |
643 | ||
7483b4a4 | 644 | /* Check hibernation first. */ |
d30bdfc0 | 645 | if (len == 4 && str_has_prefix(buf, "disk")) |
7483b4a4 | 646 | return PM_SUSPEND_MAX; |
a3d25c27 | 647 | |
296699de | 648 | #ifdef CONFIG_SUSPEND |
d431cbc5 RW |
649 | for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { |
650 | const char *label = pm_states[state]; | |
651 | ||
652 | if (label && len == strlen(label) && !strncmp(buf, label, len)) | |
653 | return state; | |
654 | } | |
296699de RW |
655 | #endif |
656 | ||
7483b4a4 RW |
657 | return PM_SUSPEND_ON; |
658 | } | |
659 | ||
660 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, | |
661 | const char *buf, size_t n) | |
662 | { | |
663 | suspend_state_t state; | |
664 | int error; | |
665 | ||
666 | error = pm_autosleep_lock(); | |
667 | if (error) | |
668 | return error; | |
669 | ||
670 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
671 | error = -EBUSY; | |
672 | goto out; | |
673 | } | |
674 | ||
675 | state = decode_state(buf, n); | |
406e7938 RW |
676 | if (state < PM_SUSPEND_MAX) { |
677 | if (state == PM_SUSPEND_MEM) | |
678 | state = mem_sleep_current; | |
679 | ||
7483b4a4 | 680 | error = pm_suspend(state); |
406e7938 | 681 | } else if (state == PM_SUSPEND_MAX) { |
7483b4a4 | 682 | error = hibernate(); |
406e7938 | 683 | } else { |
7483b4a4 | 684 | error = -EINVAL; |
406e7938 | 685 | } |
7483b4a4 RW |
686 | |
687 | out: | |
688 | pm_autosleep_unlock(); | |
1da177e4 LT |
689 | return error ? error : n; |
690 | } | |
691 | ||
692 | power_attr(state); | |
693 | ||
c125e96f RW |
694 | #ifdef CONFIG_PM_SLEEP |
695 | /* | |
696 | * The 'wakeup_count' attribute, along with the functions defined in | |
697 | * drivers/base/power/wakeup.c, provides a means by which wakeup events can be | |
698 | * handled in a non-racy way. | |
699 | * | |
700 | * If a wakeup event occurs when the system is in a sleep state, it simply is | |
701 | * woken up. In turn, if an event that would wake the system up from a sleep | |
702 | * state occurs when it is undergoing a transition to that sleep state, the | |
703 | * transition should be aborted. Moreover, if such an event occurs when the | |
704 | * system is in the working state, an attempt to start a transition to the | |
705 | * given sleep state should fail during certain period after the detection of | |
706 | * the event. Using the 'state' attribute alone is not sufficient to satisfy | |
707 | * these requirements, because a wakeup event may occur exactly when 'state' | |
708 | * is being written to and may be delivered to user space right before it is | |
709 | * frozen, so the event will remain only partially processed until the system is | |
710 | * woken up by another event. In particular, it won't cause the transition to | |
711 | * a sleep state to be aborted. | |
712 | * | |
713 | * This difficulty may be overcome if user space uses 'wakeup_count' before | |
714 | * writing to 'state'. It first should read from 'wakeup_count' and store | |
715 | * the read value. Then, after carrying out its own preparations for the system | |
716 | * transition to a sleep state, it should write the stored value to | |
25985edc | 717 | * 'wakeup_count'. If that fails, at least one wakeup event has occurred since |
c125e96f RW |
718 | * 'wakeup_count' was read and 'state' should not be written to. Otherwise, it |
719 | * is allowed to write to 'state', but the transition will be aborted if there | |
720 | * are any wakeup events detected after 'wakeup_count' was written to. | |
721 | */ | |
722 | ||
723 | static ssize_t wakeup_count_show(struct kobject *kobj, | |
724 | struct kobj_attribute *attr, | |
725 | char *buf) | |
726 | { | |
074037ec | 727 | unsigned int val; |
c125e96f | 728 | |
7483b4a4 RW |
729 | return pm_get_wakeup_count(&val, true) ? |
730 | sprintf(buf, "%u\n", val) : -EINTR; | |
c125e96f RW |
731 | } |
732 | ||
733 | static ssize_t wakeup_count_store(struct kobject *kobj, | |
734 | struct kobj_attribute *attr, | |
735 | const char *buf, size_t n) | |
736 | { | |
074037ec | 737 | unsigned int val; |
7483b4a4 RW |
738 | int error; |
739 | ||
740 | error = pm_autosleep_lock(); | |
741 | if (error) | |
742 | return error; | |
c125e96f | 743 | |
7483b4a4 RW |
744 | if (pm_autosleep_state() > PM_SUSPEND_ON) { |
745 | error = -EBUSY; | |
746 | goto out; | |
747 | } | |
748 | ||
749 | error = -EINVAL; | |
074037ec | 750 | if (sscanf(buf, "%u", &val) == 1) { |
c125e96f | 751 | if (pm_save_wakeup_count(val)) |
7483b4a4 | 752 | error = n; |
bb177fed JW |
753 | else |
754 | pm_print_active_wakeup_sources(); | |
c125e96f | 755 | } |
7483b4a4 RW |
756 | |
757 | out: | |
758 | pm_autosleep_unlock(); | |
759 | return error; | |
c125e96f RW |
760 | } |
761 | ||
762 | power_attr(wakeup_count); | |
7483b4a4 RW |
763 | |
764 | #ifdef CONFIG_PM_AUTOSLEEP | |
765 | static ssize_t autosleep_show(struct kobject *kobj, | |
766 | struct kobj_attribute *attr, | |
767 | char *buf) | |
768 | { | |
769 | suspend_state_t state = pm_autosleep_state(); | |
770 | ||
771 | if (state == PM_SUSPEND_ON) | |
772 | return sprintf(buf, "off\n"); | |
773 | ||
774 | #ifdef CONFIG_SUSPEND | |
775 | if (state < PM_SUSPEND_MAX) | |
d431cbc5 RW |
776 | return sprintf(buf, "%s\n", pm_states[state] ? |
777 | pm_states[state] : "error"); | |
7483b4a4 RW |
778 | #endif |
779 | #ifdef CONFIG_HIBERNATION | |
780 | return sprintf(buf, "disk\n"); | |
781 | #else | |
782 | return sprintf(buf, "error"); | |
783 | #endif | |
784 | } | |
785 | ||
786 | static ssize_t autosleep_store(struct kobject *kobj, | |
787 | struct kobj_attribute *attr, | |
788 | const char *buf, size_t n) | |
789 | { | |
790 | suspend_state_t state = decode_state(buf, n); | |
791 | int error; | |
792 | ||
793 | if (state == PM_SUSPEND_ON | |
040e5bf6 | 794 | && strcmp(buf, "off") && strcmp(buf, "off\n")) |
7483b4a4 RW |
795 | return -EINVAL; |
796 | ||
406e7938 RW |
797 | if (state == PM_SUSPEND_MEM) |
798 | state = mem_sleep_current; | |
799 | ||
7483b4a4 RW |
800 | error = pm_autosleep_set_state(state); |
801 | return error ? error : n; | |
802 | } | |
803 | ||
804 | power_attr(autosleep); | |
805 | #endif /* CONFIG_PM_AUTOSLEEP */ | |
b86ff982 RW |
806 | |
807 | #ifdef CONFIG_PM_WAKELOCKS | |
808 | static ssize_t wake_lock_show(struct kobject *kobj, | |
809 | struct kobj_attribute *attr, | |
810 | char *buf) | |
811 | { | |
812 | return pm_show_wakelocks(buf, true); | |
813 | } | |
814 | ||
815 | static ssize_t wake_lock_store(struct kobject *kobj, | |
816 | struct kobj_attribute *attr, | |
817 | const char *buf, size_t n) | |
818 | { | |
819 | int error = pm_wake_lock(buf); | |
820 | return error ? error : n; | |
821 | } | |
822 | ||
823 | power_attr(wake_lock); | |
824 | ||
825 | static ssize_t wake_unlock_show(struct kobject *kobj, | |
826 | struct kobj_attribute *attr, | |
827 | char *buf) | |
828 | { | |
829 | return pm_show_wakelocks(buf, false); | |
830 | } | |
831 | ||
832 | static ssize_t wake_unlock_store(struct kobject *kobj, | |
833 | struct kobj_attribute *attr, | |
834 | const char *buf, size_t n) | |
835 | { | |
836 | int error = pm_wake_unlock(buf); | |
837 | return error ? error : n; | |
838 | } | |
839 | ||
840 | power_attr(wake_unlock); | |
841 | ||
842 | #endif /* CONFIG_PM_WAKELOCKS */ | |
c125e96f RW |
843 | #endif /* CONFIG_PM_SLEEP */ |
844 | ||
c5c6ba4e RW |
845 | #ifdef CONFIG_PM_TRACE |
846 | int pm_trace_enabled; | |
847 | ||
386f275f KS |
848 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
849 | char *buf) | |
c5c6ba4e RW |
850 | { |
851 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
852 | } | |
853 | ||
854 | static ssize_t | |
386f275f KS |
855 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
856 | const char *buf, size_t n) | |
c5c6ba4e RW |
857 | { |
858 | int val; | |
859 | ||
860 | if (sscanf(buf, "%d", &val) == 1) { | |
861 | pm_trace_enabled = !!val; | |
9dceefe4 SK |
862 | if (pm_trace_enabled) { |
863 | pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n" | |
864 | "PM: Correct system time has to be restored manually after resume.\n"); | |
865 | } | |
c5c6ba4e RW |
866 | return n; |
867 | } | |
868 | return -EINVAL; | |
869 | } | |
870 | ||
871 | power_attr(pm_trace); | |
d33ac60b JH |
872 | |
873 | static ssize_t pm_trace_dev_match_show(struct kobject *kobj, | |
874 | struct kobj_attribute *attr, | |
875 | char *buf) | |
876 | { | |
877 | return show_trace_dev_match(buf, PAGE_SIZE); | |
878 | } | |
879 | ||
a1e9ca69 | 880 | power_attr_ro(pm_trace_dev_match); |
d33ac60b | 881 | |
0e7d56e3 | 882 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e | 883 | |
957d1282 LF |
884 | #ifdef CONFIG_FREEZER |
885 | static ssize_t pm_freeze_timeout_show(struct kobject *kobj, | |
886 | struct kobj_attribute *attr, char *buf) | |
887 | { | |
888 | return sprintf(buf, "%u\n", freeze_timeout_msecs); | |
889 | } | |
890 | ||
891 | static ssize_t pm_freeze_timeout_store(struct kobject *kobj, | |
892 | struct kobj_attribute *attr, | |
893 | const char *buf, size_t n) | |
894 | { | |
895 | unsigned long val; | |
896 | ||
897 | if (kstrtoul(buf, 10, &val)) | |
898 | return -EINVAL; | |
899 | ||
900 | freeze_timeout_msecs = val; | |
901 | return n; | |
902 | } | |
903 | ||
904 | power_attr(pm_freeze_timeout); | |
905 | ||
906 | #endif /* CONFIG_FREEZER*/ | |
907 | ||
c5c6ba4e RW |
908 | static struct attribute * g[] = { |
909 | &state_attr.attr, | |
0e7d56e3 | 910 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 911 | &pm_trace_attr.attr, |
d33ac60b | 912 | &pm_trace_dev_match_attr.attr, |
0e7d56e3 | 913 | #endif |
0e06b4a8 RW |
914 | #ifdef CONFIG_PM_SLEEP |
915 | &pm_async_attr.attr, | |
c125e96f | 916 | &wakeup_count_attr.attr, |
406e7938 RW |
917 | #ifdef CONFIG_SUSPEND |
918 | &mem_sleep_attr.attr, | |
c052bf82 | 919 | &sync_on_suspend_attr.attr, |
406e7938 | 920 | #endif |
7483b4a4 RW |
921 | #ifdef CONFIG_PM_AUTOSLEEP |
922 | &autosleep_attr.attr, | |
923 | #endif | |
b86ff982 RW |
924 | #ifdef CONFIG_PM_WAKELOCKS |
925 | &wake_lock_attr.attr, | |
926 | &wake_unlock_attr.attr, | |
927 | #endif | |
b2df1d4f | 928 | #ifdef CONFIG_PM_SLEEP_DEBUG |
e516a1db | 929 | &pm_test_attr.attr, |
4b7760ba | 930 | &pm_print_times_attr.attr, |
a6f5f0dd | 931 | &pm_wakeup_irq_attr.attr, |
8d8b2441 | 932 | &pm_debug_messages_attr.attr, |
0e06b4a8 | 933 | #endif |
957d1282 LF |
934 | #endif |
935 | #ifdef CONFIG_FREEZER | |
936 | &pm_freeze_timeout_attr.attr, | |
0e7d56e3 | 937 | #endif |
c5c6ba4e RW |
938 | NULL, |
939 | }; | |
1da177e4 | 940 | |
1d0c6e59 | 941 | static const struct attribute_group attr_group = { |
1da177e4 LT |
942 | .attrs = g, |
943 | }; | |
944 | ||
2c8db5be KS |
945 | static const struct attribute_group *attr_groups[] = { |
946 | &attr_group, | |
947 | #ifdef CONFIG_PM_SLEEP | |
948 | &suspend_attr_group, | |
949 | #endif | |
950 | NULL, | |
951 | }; | |
952 | ||
5e928f77 | 953 | struct workqueue_struct *pm_wq; |
7b199ca2 | 954 | EXPORT_SYMBOL_GPL(pm_wq); |
5e928f77 RW |
955 | |
956 | static int __init pm_start_workqueue(void) | |
957 | { | |
58a69cb4 | 958 | pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); |
5e928f77 RW |
959 | |
960 | return pm_wq ? 0 : -ENOMEM; | |
961 | } | |
5e928f77 | 962 | |
1da177e4 LT |
963 | static int __init pm_init(void) |
964 | { | |
5e928f77 RW |
965 | int error = pm_start_workqueue(); |
966 | if (error) | |
967 | return error; | |
ac5c24ec | 968 | hibernate_image_size_init(); |
ddeb6487 | 969 | hibernate_reserved_size_init(); |
fa7fd6fa | 970 | pm_states_init(); |
d76e15fb GKH |
971 | power_kobj = kobject_create_and_add("power", NULL); |
972 | if (!power_kobj) | |
039a5dcd | 973 | return -ENOMEM; |
2c8db5be | 974 | error = sysfs_create_groups(power_kobj, attr_groups); |
7483b4a4 RW |
975 | if (error) |
976 | return error; | |
b2df1d4f | 977 | pm_print_times_init(); |
7483b4a4 | 978 | return pm_autosleep_init(); |
1da177e4 LT |
979 | } |
980 | ||
981 | core_initcall(pm_init); |