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1da177e4 LT |
1 | /* |
2 | * kernel/power/main.c - PM subsystem core functionality. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | */ | |
10 | ||
6e5fdeed | 11 | #include <linux/export.h> |
1da177e4 LT |
12 | #include <linux/kobject.h> |
13 | #include <linux/string.h> | |
c5c6ba4e | 14 | #include <linux/resume-trace.h> |
5e928f77 | 15 | #include <linux/workqueue.h> |
2a77c46d SL |
16 | #include <linux/debugfs.h> |
17 | #include <linux/seq_file.h> | |
1da177e4 LT |
18 | |
19 | #include "power.h" | |
20 | ||
a6d70980 | 21 | DEFINE_MUTEX(pm_mutex); |
1da177e4 | 22 | |
cd51e61c RW |
23 | #ifdef CONFIG_PM_SLEEP |
24 | ||
82525756 AS |
25 | /* Routines for PM-transition notifications */ |
26 | ||
27 | static BLOCKING_NOTIFIER_HEAD(pm_chain_head); | |
28 | ||
29 | int register_pm_notifier(struct notifier_block *nb) | |
30 | { | |
31 | return blocking_notifier_chain_register(&pm_chain_head, nb); | |
32 | } | |
33 | EXPORT_SYMBOL_GPL(register_pm_notifier); | |
34 | ||
35 | int unregister_pm_notifier(struct notifier_block *nb) | |
36 | { | |
37 | return blocking_notifier_chain_unregister(&pm_chain_head, nb); | |
38 | } | |
39 | EXPORT_SYMBOL_GPL(unregister_pm_notifier); | |
40 | ||
41 | int pm_notifier_call_chain(unsigned long val) | |
42 | { | |
f0c077a8 AM |
43 | int ret = blocking_notifier_call_chain(&pm_chain_head, val, NULL); |
44 | ||
45 | return notifier_to_errno(ret); | |
82525756 AS |
46 | } |
47 | ||
0e06b4a8 RW |
48 | /* If set, devices may be suspended and resumed asynchronously. */ |
49 | int pm_async_enabled = 1; | |
50 | ||
51 | static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, | |
52 | char *buf) | |
53 | { | |
54 | return sprintf(buf, "%d\n", pm_async_enabled); | |
55 | } | |
56 | ||
57 | static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, | |
58 | const char *buf, size_t n) | |
59 | { | |
60 | unsigned long val; | |
61 | ||
62 | if (strict_strtoul(buf, 10, &val)) | |
63 | return -EINVAL; | |
64 | ||
65 | if (val > 1) | |
66 | return -EINVAL; | |
67 | ||
68 | pm_async_enabled = val; | |
69 | return n; | |
70 | } | |
71 | ||
72 | power_attr(pm_async); | |
73 | ||
0e7d56e3 RW |
74 | #ifdef CONFIG_PM_DEBUG |
75 | int pm_test_level = TEST_NONE; | |
76 | ||
0e7d56e3 RW |
77 | static const char * const pm_tests[__TEST_AFTER_LAST] = { |
78 | [TEST_NONE] = "none", | |
79 | [TEST_CORE] = "core", | |
80 | [TEST_CPUS] = "processors", | |
81 | [TEST_PLATFORM] = "platform", | |
82 | [TEST_DEVICES] = "devices", | |
83 | [TEST_FREEZER] = "freezer", | |
84 | }; | |
85 | ||
039a75c6 RW |
86 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
87 | char *buf) | |
0e7d56e3 RW |
88 | { |
89 | char *s = buf; | |
90 | int level; | |
91 | ||
92 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
93 | if (pm_tests[level]) { | |
94 | if (level == pm_test_level) | |
95 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
96 | else | |
97 | s += sprintf(s, "%s ", pm_tests[level]); | |
98 | } | |
99 | ||
100 | if (s != buf) | |
101 | /* convert the last space to a newline */ | |
102 | *(s-1) = '\n'; | |
103 | ||
104 | return (s - buf); | |
105 | } | |
106 | ||
039a75c6 RW |
107 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
108 | const char *buf, size_t n) | |
0e7d56e3 RW |
109 | { |
110 | const char * const *s; | |
111 | int level; | |
112 | char *p; | |
113 | int len; | |
114 | int error = -EINVAL; | |
115 | ||
116 | p = memchr(buf, '\n', n); | |
117 | len = p ? p - buf : n; | |
118 | ||
119 | mutex_lock(&pm_mutex); | |
120 | ||
121 | level = TEST_FIRST; | |
122 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
123 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
124 | pm_test_level = level; | |
125 | error = 0; | |
126 | break; | |
127 | } | |
128 | ||
129 | mutex_unlock(&pm_mutex); | |
130 | ||
131 | return error ? error : n; | |
132 | } | |
133 | ||
134 | power_attr(pm_test); | |
091d71e0 | 135 | #endif /* CONFIG_PM_DEBUG */ |
0e7d56e3 | 136 | |
2a77c46d SL |
137 | #ifdef CONFIG_DEBUG_FS |
138 | static char *suspend_step_name(enum suspend_stat_step step) | |
139 | { | |
140 | switch (step) { | |
141 | case SUSPEND_FREEZE: | |
142 | return "freeze"; | |
143 | case SUSPEND_PREPARE: | |
144 | return "prepare"; | |
145 | case SUSPEND_SUSPEND: | |
146 | return "suspend"; | |
147 | case SUSPEND_SUSPEND_NOIRQ: | |
148 | return "suspend_noirq"; | |
149 | case SUSPEND_RESUME_NOIRQ: | |
150 | return "resume_noirq"; | |
151 | case SUSPEND_RESUME: | |
152 | return "resume"; | |
153 | default: | |
154 | return ""; | |
155 | } | |
156 | } | |
157 | ||
158 | static int suspend_stats_show(struct seq_file *s, void *unused) | |
159 | { | |
160 | int i, index, last_dev, last_errno, last_step; | |
161 | ||
162 | last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; | |
163 | last_dev %= REC_FAILED_NUM; | |
164 | last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; | |
165 | last_errno %= REC_FAILED_NUM; | |
166 | last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; | |
167 | last_step %= REC_FAILED_NUM; | |
168 | seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n" | |
169 | "%s: %d\n%s: %d\n%s: %d\n%s: %d\n", | |
170 | "success", suspend_stats.success, | |
171 | "fail", suspend_stats.fail, | |
172 | "failed_freeze", suspend_stats.failed_freeze, | |
173 | "failed_prepare", suspend_stats.failed_prepare, | |
174 | "failed_suspend", suspend_stats.failed_suspend, | |
175 | "failed_suspend_noirq", | |
176 | suspend_stats.failed_suspend_noirq, | |
177 | "failed_resume", suspend_stats.failed_resume, | |
178 | "failed_resume_noirq", | |
179 | suspend_stats.failed_resume_noirq); | |
180 | seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", | |
181 | suspend_stats.failed_devs[last_dev]); | |
182 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
183 | index = last_dev + REC_FAILED_NUM - i; | |
184 | index %= REC_FAILED_NUM; | |
185 | seq_printf(s, "\t\t\t%-s\n", | |
186 | suspend_stats.failed_devs[index]); | |
187 | } | |
188 | seq_printf(s, " last_failed_errno:\t%-d\n", | |
189 | suspend_stats.errno[last_errno]); | |
190 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
191 | index = last_errno + REC_FAILED_NUM - i; | |
192 | index %= REC_FAILED_NUM; | |
193 | seq_printf(s, "\t\t\t%-d\n", | |
194 | suspend_stats.errno[index]); | |
195 | } | |
196 | seq_printf(s, " last_failed_step:\t%-s\n", | |
197 | suspend_step_name( | |
198 | suspend_stats.failed_steps[last_step])); | |
199 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
200 | index = last_step + REC_FAILED_NUM - i; | |
201 | index %= REC_FAILED_NUM; | |
202 | seq_printf(s, "\t\t\t%-s\n", | |
203 | suspend_step_name( | |
204 | suspend_stats.failed_steps[index])); | |
205 | } | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | static int suspend_stats_open(struct inode *inode, struct file *file) | |
211 | { | |
212 | return single_open(file, suspend_stats_show, NULL); | |
213 | } | |
214 | ||
215 | static const struct file_operations suspend_stats_operations = { | |
216 | .open = suspend_stats_open, | |
217 | .read = seq_read, | |
218 | .llseek = seq_lseek, | |
219 | .release = single_release, | |
220 | }; | |
221 | ||
222 | static int __init pm_debugfs_init(void) | |
223 | { | |
224 | debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, | |
225 | NULL, NULL, &suspend_stats_operations); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | late_initcall(pm_debugfs_init); | |
230 | #endif /* CONFIG_DEBUG_FS */ | |
231 | ||
ca123102 RW |
232 | #endif /* CONFIG_PM_SLEEP */ |
233 | ||
d76e15fb | 234 | struct kobject *power_kobj; |
1da177e4 LT |
235 | |
236 | /** | |
237 | * state - control system power state. | |
238 | * | |
239 | * show() returns what states are supported, which is hard-coded to | |
240 | * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and | |
241 | * 'disk' (Suspend-to-Disk). | |
242 | * | |
243 | * store() accepts one of those strings, translates it into the | |
244 | * proper enumerated value, and initiates a suspend transition. | |
245 | */ | |
386f275f KS |
246 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
247 | char *buf) | |
1da177e4 | 248 | { |
296699de RW |
249 | char *s = buf; |
250 | #ifdef CONFIG_SUSPEND | |
1da177e4 | 251 | int i; |
1da177e4 LT |
252 | |
253 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
123d3c13 PM |
254 | if (pm_states[i] && valid_state(i)) |
255 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 256 | } |
296699de | 257 | #endif |
b0cb1a19 | 258 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
259 | s += sprintf(s, "%s\n", "disk"); |
260 | #else | |
261 | if (s != buf) | |
262 | /* convert the last space to a newline */ | |
263 | *(s-1) = '\n'; | |
264 | #endif | |
1da177e4 LT |
265 | return (s - buf); |
266 | } | |
267 | ||
386f275f KS |
268 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
269 | const char *buf, size_t n) | |
1da177e4 | 270 | { |
296699de | 271 | #ifdef CONFIG_SUSPEND |
1da177e4 | 272 | suspend_state_t state = PM_SUSPEND_STANDBY; |
3b364b8d | 273 | const char * const *s; |
296699de | 274 | #endif |
1da177e4 | 275 | char *p; |
1da177e4 | 276 | int len; |
296699de | 277 | int error = -EINVAL; |
1da177e4 LT |
278 | |
279 | p = memchr(buf, '\n', n); | |
280 | len = p ? p - buf : n; | |
281 | ||
a3d25c27 | 282 | /* First, check if we are requested to hibernate */ |
8d98a690 | 283 | if (len == 4 && !strncmp(buf, "disk", len)) { |
a3d25c27 | 284 | error = hibernate(); |
296699de | 285 | goto Exit; |
a3d25c27 RW |
286 | } |
287 | ||
296699de | 288 | #ifdef CONFIG_SUSPEND |
1da177e4 | 289 | for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { |
8d98a690 | 290 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) |
1da177e4 LT |
291 | break; |
292 | } | |
47bb7899 | 293 | if (state < PM_SUSPEND_MAX && *s) |
1da177e4 | 294 | error = enter_state(state); |
2a77c46d SL |
295 | if (error) { |
296 | suspend_stats.fail++; | |
297 | dpm_save_failed_errno(error); | |
298 | } else | |
299 | suspend_stats.success++; | |
296699de RW |
300 | #endif |
301 | ||
302 | Exit: | |
1da177e4 LT |
303 | return error ? error : n; |
304 | } | |
305 | ||
306 | power_attr(state); | |
307 | ||
c125e96f RW |
308 | #ifdef CONFIG_PM_SLEEP |
309 | /* | |
310 | * The 'wakeup_count' attribute, along with the functions defined in | |
311 | * drivers/base/power/wakeup.c, provides a means by which wakeup events can be | |
312 | * handled in a non-racy way. | |
313 | * | |
314 | * If a wakeup event occurs when the system is in a sleep state, it simply is | |
315 | * woken up. In turn, if an event that would wake the system up from a sleep | |
316 | * state occurs when it is undergoing a transition to that sleep state, the | |
317 | * transition should be aborted. Moreover, if such an event occurs when the | |
318 | * system is in the working state, an attempt to start a transition to the | |
319 | * given sleep state should fail during certain period after the detection of | |
320 | * the event. Using the 'state' attribute alone is not sufficient to satisfy | |
321 | * these requirements, because a wakeup event may occur exactly when 'state' | |
322 | * is being written to and may be delivered to user space right before it is | |
323 | * frozen, so the event will remain only partially processed until the system is | |
324 | * woken up by another event. In particular, it won't cause the transition to | |
325 | * a sleep state to be aborted. | |
326 | * | |
327 | * This difficulty may be overcome if user space uses 'wakeup_count' before | |
328 | * writing to 'state'. It first should read from 'wakeup_count' and store | |
329 | * the read value. Then, after carrying out its own preparations for the system | |
330 | * transition to a sleep state, it should write the stored value to | |
25985edc | 331 | * 'wakeup_count'. If that fails, at least one wakeup event has occurred since |
c125e96f RW |
332 | * 'wakeup_count' was read and 'state' should not be written to. Otherwise, it |
333 | * is allowed to write to 'state', but the transition will be aborted if there | |
334 | * are any wakeup events detected after 'wakeup_count' was written to. | |
335 | */ | |
336 | ||
337 | static ssize_t wakeup_count_show(struct kobject *kobj, | |
338 | struct kobj_attribute *attr, | |
339 | char *buf) | |
340 | { | |
074037ec | 341 | unsigned int val; |
c125e96f | 342 | |
074037ec | 343 | return pm_get_wakeup_count(&val) ? sprintf(buf, "%u\n", val) : -EINTR; |
c125e96f RW |
344 | } |
345 | ||
346 | static ssize_t wakeup_count_store(struct kobject *kobj, | |
347 | struct kobj_attribute *attr, | |
348 | const char *buf, size_t n) | |
349 | { | |
074037ec | 350 | unsigned int val; |
c125e96f | 351 | |
074037ec | 352 | if (sscanf(buf, "%u", &val) == 1) { |
c125e96f RW |
353 | if (pm_save_wakeup_count(val)) |
354 | return n; | |
355 | } | |
356 | return -EINVAL; | |
357 | } | |
358 | ||
359 | power_attr(wakeup_count); | |
360 | #endif /* CONFIG_PM_SLEEP */ | |
361 | ||
c5c6ba4e RW |
362 | #ifdef CONFIG_PM_TRACE |
363 | int pm_trace_enabled; | |
364 | ||
386f275f KS |
365 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
366 | char *buf) | |
c5c6ba4e RW |
367 | { |
368 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
369 | } | |
370 | ||
371 | static ssize_t | |
386f275f KS |
372 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
373 | const char *buf, size_t n) | |
c5c6ba4e RW |
374 | { |
375 | int val; | |
376 | ||
377 | if (sscanf(buf, "%d", &val) == 1) { | |
378 | pm_trace_enabled = !!val; | |
379 | return n; | |
380 | } | |
381 | return -EINVAL; | |
382 | } | |
383 | ||
384 | power_attr(pm_trace); | |
d33ac60b JH |
385 | |
386 | static ssize_t pm_trace_dev_match_show(struct kobject *kobj, | |
387 | struct kobj_attribute *attr, | |
388 | char *buf) | |
389 | { | |
390 | return show_trace_dev_match(buf, PAGE_SIZE); | |
391 | } | |
392 | ||
393 | static ssize_t | |
394 | pm_trace_dev_match_store(struct kobject *kobj, struct kobj_attribute *attr, | |
395 | const char *buf, size_t n) | |
396 | { | |
397 | return -EINVAL; | |
398 | } | |
399 | ||
400 | power_attr(pm_trace_dev_match); | |
401 | ||
0e7d56e3 | 402 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e RW |
403 | |
404 | static struct attribute * g[] = { | |
405 | &state_attr.attr, | |
0e7d56e3 | 406 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 407 | &pm_trace_attr.attr, |
d33ac60b | 408 | &pm_trace_dev_match_attr.attr, |
0e7d56e3 | 409 | #endif |
0e06b4a8 RW |
410 | #ifdef CONFIG_PM_SLEEP |
411 | &pm_async_attr.attr, | |
c125e96f | 412 | &wakeup_count_attr.attr, |
0e06b4a8 | 413 | #ifdef CONFIG_PM_DEBUG |
0e7d56e3 | 414 | &pm_test_attr.attr, |
0e06b4a8 | 415 | #endif |
0e7d56e3 | 416 | #endif |
c5c6ba4e RW |
417 | NULL, |
418 | }; | |
1da177e4 LT |
419 | |
420 | static struct attribute_group attr_group = { | |
421 | .attrs = g, | |
422 | }; | |
423 | ||
5e928f77 RW |
424 | #ifdef CONFIG_PM_RUNTIME |
425 | struct workqueue_struct *pm_wq; | |
7b199ca2 | 426 | EXPORT_SYMBOL_GPL(pm_wq); |
5e928f77 RW |
427 | |
428 | static int __init pm_start_workqueue(void) | |
429 | { | |
58a69cb4 | 430 | pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); |
5e928f77 RW |
431 | |
432 | return pm_wq ? 0 : -ENOMEM; | |
433 | } | |
434 | #else | |
435 | static inline int pm_start_workqueue(void) { return 0; } | |
436 | #endif | |
437 | ||
1da177e4 LT |
438 | static int __init pm_init(void) |
439 | { | |
5e928f77 RW |
440 | int error = pm_start_workqueue(); |
441 | if (error) | |
442 | return error; | |
ac5c24ec | 443 | hibernate_image_size_init(); |
ddeb6487 | 444 | hibernate_reserved_size_init(); |
d76e15fb GKH |
445 | power_kobj = kobject_create_and_add("power", NULL); |
446 | if (!power_kobj) | |
039a5dcd | 447 | return -ENOMEM; |
d76e15fb | 448 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
449 | } |
450 | ||
451 | core_initcall(pm_init); |