Commit | Line | Data |
---|---|---|
a9d70523 RW |
1 | /* |
2 | * kernel/power/suspend.c - Suspend to RAM and standby functionality. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. | |
7 | * | |
8 | * This file is released under the GPLv2. | |
9 | */ | |
10 | ||
11 | #include <linux/string.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/console.h> | |
16 | #include <linux/cpu.h> | |
f3f12532 | 17 | #include <linux/cpuidle.h> |
a9d70523 | 18 | #include <linux/syscalls.h> |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
dd4c4f17 MG |
20 | #include <linux/io.h> |
21 | #include <linux/kernel.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/slab.h> | |
6e5fdeed | 25 | #include <linux/export.h> |
dd4c4f17 | 26 | #include <linux/suspend.h> |
40dc166c | 27 | #include <linux/syscore_ops.h> |
443772d4 | 28 | #include <linux/ftrace.h> |
938cfed1 | 29 | #include <trace/events/power.h> |
52f5684c | 30 | #include <linux/compiler.h> |
1d4a9c17 | 31 | #include <linux/moduleparam.h> |
a9d70523 RW |
32 | |
33 | #include "power.h" | |
34 | ||
406e7938 RW |
35 | const char * const pm_labels[] = { |
36 | [PM_SUSPEND_FREEZE] = "freeze", | |
37 | [PM_SUSPEND_STANDBY] = "standby", | |
38 | [PM_SUSPEND_MEM] = "mem", | |
39 | }; | |
d431cbc5 | 40 | const char *pm_states[PM_SUSPEND_MAX]; |
406e7938 RW |
41 | static const char * const mem_sleep_labels[] = { |
42 | [PM_SUSPEND_FREEZE] = "s2idle", | |
43 | [PM_SUSPEND_STANDBY] = "shallow", | |
44 | [PM_SUSPEND_MEM] = "deep", | |
45 | }; | |
46 | const char *mem_sleep_states[PM_SUSPEND_MAX]; | |
47 | ||
48 | suspend_state_t mem_sleep_current = PM_SUSPEND_FREEZE; | |
e326ce01 | 49 | static suspend_state_t mem_sleep_default = PM_SUSPEND_MEM; |
a9d70523 | 50 | |
ef25ba04 RW |
51 | unsigned int pm_suspend_global_flags; |
52 | EXPORT_SYMBOL_GPL(pm_suspend_global_flags); | |
53 | ||
2f55ac07 | 54 | static const struct platform_suspend_ops *suspend_ops; |
1f0b6386 | 55 | static const struct platform_freeze_ops *freeze_ops; |
7e73c5ae | 56 | static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head); |
38106313 RW |
57 | |
58 | enum freeze_state __read_mostly suspend_freeze_state; | |
59 | static DEFINE_SPINLOCK(suspend_freeze_lock); | |
7e73c5ae | 60 | |
1f0b6386 RW |
61 | void freeze_set_ops(const struct platform_freeze_ops *ops) |
62 | { | |
63 | lock_system_sleep(); | |
64 | freeze_ops = ops; | |
65 | unlock_system_sleep(); | |
66 | } | |
67 | ||
7e73c5ae ZR |
68 | static void freeze_begin(void) |
69 | { | |
38106313 | 70 | suspend_freeze_state = FREEZE_STATE_NONE; |
7e73c5ae ZR |
71 | } |
72 | ||
73 | static void freeze_enter(void) | |
74 | { | |
38106313 RW |
75 | spin_lock_irq(&suspend_freeze_lock); |
76 | if (pm_wakeup_pending()) | |
77 | goto out; | |
78 | ||
79 | suspend_freeze_state = FREEZE_STATE_ENTER; | |
80 | spin_unlock_irq(&suspend_freeze_lock); | |
81 | ||
82 | get_online_cpus(); | |
f3f12532 | 83 | cpuidle_resume(); |
38106313 RW |
84 | |
85 | /* Push all the CPUs into the idle loop. */ | |
86 | wake_up_all_idle_cpus(); | |
87 | pr_debug("PM: suspend-to-idle\n"); | |
88 | /* Make the current CPU wait so it can enter the idle loop too. */ | |
89 | wait_event(suspend_freeze_wait_head, | |
90 | suspend_freeze_state == FREEZE_STATE_WAKE); | |
91 | pr_debug("PM: resume from suspend-to-idle\n"); | |
92 | ||
f3f12532 | 93 | cpuidle_pause(); |
38106313 RW |
94 | put_online_cpus(); |
95 | ||
96 | spin_lock_irq(&suspend_freeze_lock); | |
97 | ||
98 | out: | |
99 | suspend_freeze_state = FREEZE_STATE_NONE; | |
100 | spin_unlock_irq(&suspend_freeze_lock); | |
7e73c5ae ZR |
101 | } |
102 | ||
103 | void freeze_wake(void) | |
104 | { | |
38106313 RW |
105 | unsigned long flags; |
106 | ||
107 | spin_lock_irqsave(&suspend_freeze_lock, flags); | |
108 | if (suspend_freeze_state > FREEZE_STATE_NONE) { | |
109 | suspend_freeze_state = FREEZE_STATE_WAKE; | |
110 | wake_up(&suspend_freeze_wait_head); | |
111 | } | |
112 | spin_unlock_irqrestore(&suspend_freeze_lock, flags); | |
7e73c5ae ZR |
113 | } |
114 | EXPORT_SYMBOL_GPL(freeze_wake); | |
115 | ||
43e8317b RW |
116 | static bool valid_state(suspend_state_t state) |
117 | { | |
118 | /* | |
119 | * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level | |
120 | * support and need to be valid to the low level | |
121 | * implementation, no valid callback implies that none are valid. | |
122 | */ | |
123 | return suspend_ops && suspend_ops->valid && suspend_ops->valid(state); | |
124 | } | |
125 | ||
fa7fd6fa SH |
126 | void __init pm_states_init(void) |
127 | { | |
406e7938 RW |
128 | /* "mem" and "freeze" are always present in /sys/power/state. */ |
129 | pm_states[PM_SUSPEND_MEM] = pm_labels[PM_SUSPEND_MEM]; | |
130 | pm_states[PM_SUSPEND_FREEZE] = pm_labels[PM_SUSPEND_FREEZE]; | |
fa7fd6fa | 131 | /* |
406e7938 RW |
132 | * Suspend-to-idle should be supported even without any suspend_ops, |
133 | * initialize mem_sleep_states[] accordingly here. | |
fa7fd6fa | 134 | */ |
406e7938 | 135 | mem_sleep_states[PM_SUSPEND_FREEZE] = mem_sleep_labels[PM_SUSPEND_FREEZE]; |
fa7fd6fa SH |
136 | } |
137 | ||
406e7938 | 138 | static int __init mem_sleep_default_setup(char *str) |
0399d4db | 139 | { |
406e7938 RW |
140 | suspend_state_t state; |
141 | ||
142 | for (state = PM_SUSPEND_FREEZE; state <= PM_SUSPEND_MEM; state++) | |
143 | if (mem_sleep_labels[state] && | |
144 | !strcmp(str, mem_sleep_labels[state])) { | |
145 | mem_sleep_default = state; | |
146 | break; | |
147 | } | |
148 | ||
0399d4db RW |
149 | return 1; |
150 | } | |
406e7938 | 151 | __setup("mem_sleep_default=", mem_sleep_default_setup); |
0399d4db | 152 | |
a9d70523 | 153 | /** |
55ae4519 RW |
154 | * suspend_set_ops - Set the global suspend method table. |
155 | * @ops: Suspend operations to use. | |
a9d70523 | 156 | */ |
2f55ac07 | 157 | void suspend_set_ops(const struct platform_suspend_ops *ops) |
a9d70523 | 158 | { |
bcda53fa | 159 | lock_system_sleep(); |
43e8317b | 160 | |
a9d70523 | 161 | suspend_ops = ops; |
0399d4db | 162 | |
406e7938 RW |
163 | if (valid_state(PM_SUSPEND_STANDBY)) { |
164 | mem_sleep_states[PM_SUSPEND_STANDBY] = mem_sleep_labels[PM_SUSPEND_STANDBY]; | |
165 | pm_states[PM_SUSPEND_STANDBY] = pm_labels[PM_SUSPEND_STANDBY]; | |
166 | if (mem_sleep_default == PM_SUSPEND_STANDBY) | |
167 | mem_sleep_current = PM_SUSPEND_STANDBY; | |
168 | } | |
169 | if (valid_state(PM_SUSPEND_MEM)) { | |
170 | mem_sleep_states[PM_SUSPEND_MEM] = mem_sleep_labels[PM_SUSPEND_MEM]; | |
e326ce01 | 171 | if (mem_sleep_default == PM_SUSPEND_MEM) |
406e7938 RW |
172 | mem_sleep_current = PM_SUSPEND_MEM; |
173 | } | |
43e8317b | 174 | |
bcda53fa | 175 | unlock_system_sleep(); |
a9d70523 | 176 | } |
a5e4fd87 | 177 | EXPORT_SYMBOL_GPL(suspend_set_ops); |
a9d70523 | 178 | |
a9d70523 | 179 | /** |
55ae4519 | 180 | * suspend_valid_only_mem - Generic memory-only valid callback. |
a9d70523 | 181 | * |
55ae4519 RW |
182 | * Platform drivers that implement mem suspend only and only need to check for |
183 | * that in their .valid() callback can use this instead of rolling their own | |
184 | * .valid() callback. | |
a9d70523 RW |
185 | */ |
186 | int suspend_valid_only_mem(suspend_state_t state) | |
187 | { | |
188 | return state == PM_SUSPEND_MEM; | |
189 | } | |
a5e4fd87 | 190 | EXPORT_SYMBOL_GPL(suspend_valid_only_mem); |
a9d70523 | 191 | |
8490fdf9 RW |
192 | static bool sleep_state_supported(suspend_state_t state) |
193 | { | |
194 | return state == PM_SUSPEND_FREEZE || (suspend_ops && suspend_ops->enter); | |
195 | } | |
196 | ||
197 | static int platform_suspend_prepare(suspend_state_t state) | |
198 | { | |
199 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare ? | |
200 | suspend_ops->prepare() : 0; | |
201 | } | |
202 | ||
a8d46b9e RW |
203 | static int platform_suspend_prepare_late(suspend_state_t state) |
204 | { | |
403b9636 | 205 | return state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->prepare ? |
a8d46b9e RW |
206 | freeze_ops->prepare() : 0; |
207 | } | |
208 | ||
ebc3e41e | 209 | static int platform_suspend_prepare_noirq(suspend_state_t state) |
8490fdf9 RW |
210 | { |
211 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare_late ? | |
212 | suspend_ops->prepare_late() : 0; | |
213 | } | |
214 | ||
ebc3e41e | 215 | static void platform_resume_noirq(suspend_state_t state) |
8490fdf9 RW |
216 | { |
217 | if (state != PM_SUSPEND_FREEZE && suspend_ops->wake) | |
218 | suspend_ops->wake(); | |
219 | } | |
220 | ||
a8d46b9e RW |
221 | static void platform_resume_early(suspend_state_t state) |
222 | { | |
403b9636 | 223 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->restore) |
a8d46b9e RW |
224 | freeze_ops->restore(); |
225 | } | |
226 | ||
ebc3e41e | 227 | static void platform_resume_finish(suspend_state_t state) |
8490fdf9 RW |
228 | { |
229 | if (state != PM_SUSPEND_FREEZE && suspend_ops->finish) | |
230 | suspend_ops->finish(); | |
231 | } | |
232 | ||
233 | static int platform_suspend_begin(suspend_state_t state) | |
234 | { | |
235 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->begin) | |
236 | return freeze_ops->begin(); | |
fa7fd6fa | 237 | else if (suspend_ops && suspend_ops->begin) |
8490fdf9 RW |
238 | return suspend_ops->begin(state); |
239 | else | |
240 | return 0; | |
241 | } | |
242 | ||
ebc3e41e | 243 | static void platform_resume_end(suspend_state_t state) |
8490fdf9 RW |
244 | { |
245 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->end) | |
246 | freeze_ops->end(); | |
fa7fd6fa | 247 | else if (suspend_ops && suspend_ops->end) |
8490fdf9 RW |
248 | suspend_ops->end(); |
249 | } | |
250 | ||
ebc3e41e | 251 | static void platform_recover(suspend_state_t state) |
8490fdf9 RW |
252 | { |
253 | if (state != PM_SUSPEND_FREEZE && suspend_ops->recover) | |
254 | suspend_ops->recover(); | |
255 | } | |
256 | ||
257 | static bool platform_suspend_again(suspend_state_t state) | |
258 | { | |
259 | return state != PM_SUSPEND_FREEZE && suspend_ops->suspend_again ? | |
260 | suspend_ops->suspend_again() : false; | |
261 | } | |
262 | ||
1d4a9c17 BN |
263 | #ifdef CONFIG_PM_DEBUG |
264 | static unsigned int pm_test_delay = 5; | |
265 | module_param(pm_test_delay, uint, 0644); | |
266 | MODULE_PARM_DESC(pm_test_delay, | |
267 | "Number of seconds to wait before resuming from suspend test"); | |
268 | #endif | |
269 | ||
a9d70523 RW |
270 | static int suspend_test(int level) |
271 | { | |
272 | #ifdef CONFIG_PM_DEBUG | |
273 | if (pm_test_level == level) { | |
22e09b33 | 274 | pr_info("suspend debug: Waiting for %d second(s).\n", |
1d4a9c17 BN |
275 | pm_test_delay); |
276 | mdelay(pm_test_delay * 1000); | |
a9d70523 RW |
277 | return 1; |
278 | } | |
279 | #endif /* !CONFIG_PM_DEBUG */ | |
280 | return 0; | |
281 | } | |
282 | ||
283 | /** | |
55ae4519 | 284 | * suspend_prepare - Prepare for entering system sleep state. |
a9d70523 | 285 | * |
55ae4519 RW |
286 | * Common code run for every system sleep state that can be entered (except for |
287 | * hibernation). Run suspend notifiers, allocate the "suspend" console and | |
288 | * freeze processes. | |
a9d70523 | 289 | */ |
7e73c5ae | 290 | static int suspend_prepare(suspend_state_t state) |
a9d70523 | 291 | { |
ea00f4f4 | 292 | int error, nr_calls = 0; |
a9d70523 | 293 | |
8490fdf9 | 294 | if (!sleep_state_supported(state)) |
a9d70523 RW |
295 | return -EPERM; |
296 | ||
297 | pm_prepare_console(); | |
298 | ||
ea00f4f4 LW |
299 | error = __pm_notifier_call_chain(PM_SUSPEND_PREPARE, -1, &nr_calls); |
300 | if (error) { | |
301 | nr_calls--; | |
a9d70523 | 302 | goto Finish; |
ea00f4f4 | 303 | } |
a9d70523 | 304 | |
bb3632c6 | 305 | trace_suspend_resume(TPS("freeze_processes"), 0, true); |
a9d70523 | 306 | error = suspend_freeze_processes(); |
bb3632c6 | 307 | trace_suspend_resume(TPS("freeze_processes"), 0, false); |
03afed8b | 308 | if (!error) |
a9d70523 RW |
309 | return 0; |
310 | ||
03afed8b TH |
311 | suspend_stats.failed_freeze++; |
312 | dpm_save_failed_step(SUSPEND_FREEZE); | |
a9d70523 | 313 | Finish: |
ea00f4f4 | 314 | __pm_notifier_call_chain(PM_POST_SUSPEND, nr_calls, NULL); |
a9d70523 RW |
315 | pm_restore_console(); |
316 | return error; | |
317 | } | |
318 | ||
319 | /* default implementation */ | |
52f5684c | 320 | void __weak arch_suspend_disable_irqs(void) |
a9d70523 RW |
321 | { |
322 | local_irq_disable(); | |
323 | } | |
324 | ||
325 | /* default implementation */ | |
52f5684c | 326 | void __weak arch_suspend_enable_irqs(void) |
a9d70523 RW |
327 | { |
328 | local_irq_enable(); | |
329 | } | |
330 | ||
331 | /** | |
55ae4519 RW |
332 | * suspend_enter - Make the system enter the given sleep state. |
333 | * @state: System sleep state to enter. | |
334 | * @wakeup: Returns information that the sleep state should not be re-entered. | |
a9d70523 | 335 | * |
3b5fe852 | 336 | * This function should be called after devices have been suspended. |
a9d70523 | 337 | */ |
3b5fe852 | 338 | static int suspend_enter(suspend_state_t state, bool *wakeup) |
a9d70523 RW |
339 | { |
340 | int error; | |
341 | ||
8490fdf9 RW |
342 | error = platform_suspend_prepare(state); |
343 | if (error) | |
344 | goto Platform_finish; | |
a9d70523 | 345 | |
2a8a8ce6 | 346 | error = dpm_suspend_late(PMSG_SUSPEND); |
a9d70523 | 347 | if (error) { |
22e09b33 | 348 | pr_err("PM: late suspend of devices failed\n"); |
ce441011 | 349 | goto Platform_finish; |
a9d70523 | 350 | } |
a8d46b9e RW |
351 | error = platform_suspend_prepare_late(state); |
352 | if (error) | |
353 | goto Devices_early_resume; | |
354 | ||
2a8a8ce6 RW |
355 | error = dpm_suspend_noirq(PMSG_SUSPEND); |
356 | if (error) { | |
22e09b33 | 357 | pr_err("PM: noirq suspend of devices failed\n"); |
a8d46b9e | 358 | goto Platform_early_resume; |
2a8a8ce6 | 359 | } |
ebc3e41e | 360 | error = platform_suspend_prepare_noirq(state); |
8490fdf9 RW |
361 | if (error) |
362 | goto Platform_wake; | |
a9d70523 | 363 | |
08605acc ZR |
364 | if (suspend_test(TEST_PLATFORM)) |
365 | goto Platform_wake; | |
366 | ||
7e73c5ae ZR |
367 | /* |
368 | * PM_SUSPEND_FREEZE equals | |
369 | * frozen processes + suspended devices + idle processors. | |
370 | * Thus we should invoke freeze_enter() soon after | |
371 | * all the devices are suspended. | |
372 | */ | |
373 | if (state == PM_SUSPEND_FREEZE) { | |
bb3632c6 | 374 | trace_suspend_resume(TPS("machine_suspend"), state, true); |
7e73c5ae | 375 | freeze_enter(); |
bb3632c6 | 376 | trace_suspend_resume(TPS("machine_suspend"), state, false); |
7e73c5ae ZR |
377 | goto Platform_wake; |
378 | } | |
379 | ||
a9d70523 RW |
380 | error = disable_nonboot_cpus(); |
381 | if (error || suspend_test(TEST_CPUS)) | |
382 | goto Enable_cpus; | |
383 | ||
384 | arch_suspend_disable_irqs(); | |
385 | BUG_ON(!irqs_disabled()); | |
386 | ||
2e711c04 | 387 | error = syscore_suspend(); |
a9d70523 | 388 | if (!error) { |
3b5fe852 MH |
389 | *wakeup = pm_wakeup_pending(); |
390 | if (!(suspend_test(TEST_CORE) || *wakeup)) { | |
bb3632c6 TB |
391 | trace_suspend_resume(TPS("machine_suspend"), |
392 | state, true); | |
a9d70523 | 393 | error = suspend_ops->enter(state); |
bb3632c6 TB |
394 | trace_suspend_resume(TPS("machine_suspend"), |
395 | state, false); | |
c125e96f | 396 | events_check_enabled = false; |
67176736 RK |
397 | } else if (*wakeup) { |
398 | error = -EBUSY; | |
c125e96f | 399 | } |
40dc166c | 400 | syscore_resume(); |
a9d70523 RW |
401 | } |
402 | ||
403 | arch_suspend_enable_irqs(); | |
404 | BUG_ON(irqs_disabled()); | |
405 | ||
406 | Enable_cpus: | |
407 | enable_nonboot_cpus(); | |
408 | ||
409 | Platform_wake: | |
ebc3e41e | 410 | platform_resume_noirq(state); |
2a8a8ce6 RW |
411 | dpm_resume_noirq(PMSG_RESUME); |
412 | ||
a8d46b9e RW |
413 | Platform_early_resume: |
414 | platform_resume_early(state); | |
415 | ||
2a8a8ce6 RW |
416 | Devices_early_resume: |
417 | dpm_resume_early(PMSG_RESUME); | |
a9d70523 | 418 | |
ce441011 | 419 | Platform_finish: |
ebc3e41e | 420 | platform_resume_finish(state); |
a9d70523 RW |
421 | return error; |
422 | } | |
423 | ||
424 | /** | |
55ae4519 RW |
425 | * suspend_devices_and_enter - Suspend devices and enter system sleep state. |
426 | * @state: System sleep state to enter. | |
a9d70523 RW |
427 | */ |
428 | int suspend_devices_and_enter(suspend_state_t state) | |
429 | { | |
430 | int error; | |
3b5fe852 | 431 | bool wakeup = false; |
a9d70523 | 432 | |
8490fdf9 | 433 | if (!sleep_state_supported(state)) |
a9d70523 RW |
434 | return -ENOSYS; |
435 | ||
8490fdf9 RW |
436 | error = platform_suspend_begin(state); |
437 | if (error) | |
438 | goto Close; | |
439 | ||
a9d70523 RW |
440 | suspend_console(); |
441 | suspend_test_start(); | |
442 | error = dpm_suspend_start(PMSG_SUSPEND); | |
443 | if (error) { | |
9350de06 | 444 | pr_err("PM: Some devices failed to suspend, or early wake event detected\n"); |
a9d70523 RW |
445 | goto Recover_platform; |
446 | } | |
447 | suspend_test_finish("suspend devices"); | |
448 | if (suspend_test(TEST_DEVICES)) | |
449 | goto Recover_platform; | |
450 | ||
3b5fe852 MH |
451 | do { |
452 | error = suspend_enter(state, &wakeup); | |
8490fdf9 | 453 | } while (!error && !wakeup && platform_suspend_again(state)); |
a9d70523 RW |
454 | |
455 | Resume_devices: | |
456 | suspend_test_start(); | |
457 | dpm_resume_end(PMSG_RESUME); | |
458 | suspend_test_finish("resume devices"); | |
0cadc702 | 459 | trace_suspend_resume(TPS("resume_console"), state, true); |
a9d70523 | 460 | resume_console(); |
0cadc702 | 461 | trace_suspend_resume(TPS("resume_console"), state, false); |
1f0b6386 | 462 | |
8490fdf9 | 463 | Close: |
ebc3e41e | 464 | platform_resume_end(state); |
a9d70523 RW |
465 | return error; |
466 | ||
467 | Recover_platform: | |
ebc3e41e | 468 | platform_recover(state); |
a9d70523 RW |
469 | goto Resume_devices; |
470 | } | |
471 | ||
472 | /** | |
55ae4519 | 473 | * suspend_finish - Clean up before finishing the suspend sequence. |
a9d70523 | 474 | * |
55ae4519 RW |
475 | * Call platform code to clean up, restart processes, and free the console that |
476 | * we've allocated. This routine is not called for hibernation. | |
a9d70523 RW |
477 | */ |
478 | static void suspend_finish(void) | |
479 | { | |
480 | suspend_thaw_processes(); | |
a9d70523 RW |
481 | pm_notifier_call_chain(PM_POST_SUSPEND); |
482 | pm_restore_console(); | |
483 | } | |
484 | ||
485 | /** | |
55ae4519 RW |
486 | * enter_state - Do common work needed to enter system sleep state. |
487 | * @state: System sleep state to enter. | |
a9d70523 | 488 | * |
55ae4519 RW |
489 | * Make sure that no one else is trying to put the system into a sleep state. |
490 | * Fail if that's not the case. Otherwise, prepare for system suspend, make the | |
491 | * system enter the given sleep state and clean up after wakeup. | |
a9d70523 | 492 | */ |
93e1ee43 | 493 | static int enter_state(suspend_state_t state) |
a9d70523 RW |
494 | { |
495 | int error; | |
496 | ||
bb3632c6 | 497 | trace_suspend_resume(TPS("suspend_enter"), state, true); |
43e8317b RW |
498 | if (state == PM_SUSPEND_FREEZE) { |
499 | #ifdef CONFIG_PM_DEBUG | |
500 | if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) { | |
a395d6a7 | 501 | pr_warn("PM: Unsupported test mode for suspend to idle, please choose none/freezer/devices/platform.\n"); |
43e8317b RW |
502 | return -EAGAIN; |
503 | } | |
504 | #endif | |
505 | } else if (!valid_state(state)) { | |
506 | return -EINVAL; | |
507 | } | |
a9d70523 RW |
508 | if (!mutex_trylock(&pm_mutex)) |
509 | return -EBUSY; | |
510 | ||
7e73c5ae ZR |
511 | if (state == PM_SUSPEND_FREEZE) |
512 | freeze_begin(); | |
513 | ||
2fd77fff | 514 | #ifndef CONFIG_SUSPEND_SKIP_SYNC |
bb3632c6 | 515 | trace_suspend_resume(TPS("sync_filesystems"), 0, true); |
1adb469b | 516 | pr_info("PM: Syncing filesystems ... "); |
a9d70523 | 517 | sys_sync(); |
1adb469b | 518 | pr_cont("done.\n"); |
bb3632c6 | 519 | trace_suspend_resume(TPS("sync_filesystems"), 0, false); |
2fd77fff | 520 | #endif |
a9d70523 | 521 | |
a9215045 | 522 | pr_debug("PM: Preparing system for sleep (%s)\n", pm_states[state]); |
ef25ba04 | 523 | pm_suspend_clear_flags(); |
7e73c5ae | 524 | error = suspend_prepare(state); |
a9d70523 RW |
525 | if (error) |
526 | goto Unlock; | |
527 | ||
528 | if (suspend_test(TEST_FREEZER)) | |
529 | goto Finish; | |
530 | ||
bb3632c6 | 531 | trace_suspend_resume(TPS("suspend_enter"), state, false); |
a9215045 | 532 | pr_debug("PM: Suspending system (%s)\n", pm_states[state]); |
87186475 | 533 | pm_restrict_gfp_mask(); |
a9d70523 | 534 | error = suspend_devices_and_enter(state); |
87186475 | 535 | pm_restore_gfp_mask(); |
a9d70523 RW |
536 | |
537 | Finish: | |
538 | pr_debug("PM: Finishing wakeup.\n"); | |
539 | suspend_finish(); | |
540 | Unlock: | |
541 | mutex_unlock(&pm_mutex); | |
542 | return error; | |
543 | } | |
544 | ||
545 | /** | |
55ae4519 RW |
546 | * pm_suspend - Externally visible function for suspending the system. |
547 | * @state: System sleep state to enter. | |
a9d70523 | 548 | * |
55ae4519 RW |
549 | * Check if the value of @state represents one of the supported states, |
550 | * execute enter_state() and update system suspend statistics. | |
a9d70523 RW |
551 | */ |
552 | int pm_suspend(suspend_state_t state) | |
553 | { | |
bc25cf50 RW |
554 | int error; |
555 | ||
556 | if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) | |
557 | return -EINVAL; | |
558 | ||
559 | error = enter_state(state); | |
560 | if (error) { | |
561 | suspend_stats.fail++; | |
562 | dpm_save_failed_errno(error); | |
563 | } else { | |
564 | suspend_stats.success++; | |
2a77c46d | 565 | } |
bc25cf50 | 566 | return error; |
a9d70523 RW |
567 | } |
568 | EXPORT_SYMBOL(pm_suspend); |