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Commit | Line | Data |
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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 | ||
62109b43 | 35 | const char *pm_labels[] = { "mem", "standby", "freeze", NULL }; |
d431cbc5 | 36 | const char *pm_states[PM_SUSPEND_MAX]; |
a9d70523 | 37 | |
ef25ba04 RW |
38 | unsigned int pm_suspend_global_flags; |
39 | EXPORT_SYMBOL_GPL(pm_suspend_global_flags); | |
40 | ||
2f55ac07 | 41 | static const struct platform_suspend_ops *suspend_ops; |
1f0b6386 | 42 | static const struct platform_freeze_ops *freeze_ops; |
7e73c5ae | 43 | static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head); |
38106313 RW |
44 | |
45 | enum freeze_state __read_mostly suspend_freeze_state; | |
46 | static DEFINE_SPINLOCK(suspend_freeze_lock); | |
7e73c5ae | 47 | |
1f0b6386 RW |
48 | void freeze_set_ops(const struct platform_freeze_ops *ops) |
49 | { | |
50 | lock_system_sleep(); | |
51 | freeze_ops = ops; | |
52 | unlock_system_sleep(); | |
53 | } | |
54 | ||
7e73c5ae ZR |
55 | static void freeze_begin(void) |
56 | { | |
38106313 | 57 | suspend_freeze_state = FREEZE_STATE_NONE; |
7e73c5ae ZR |
58 | } |
59 | ||
60 | static void freeze_enter(void) | |
61 | { | |
38106313 RW |
62 | spin_lock_irq(&suspend_freeze_lock); |
63 | if (pm_wakeup_pending()) | |
64 | goto out; | |
65 | ||
66 | suspend_freeze_state = FREEZE_STATE_ENTER; | |
67 | spin_unlock_irq(&suspend_freeze_lock); | |
68 | ||
69 | get_online_cpus(); | |
f3f12532 | 70 | cpuidle_resume(); |
38106313 RW |
71 | |
72 | /* Push all the CPUs into the idle loop. */ | |
73 | wake_up_all_idle_cpus(); | |
74 | pr_debug("PM: suspend-to-idle\n"); | |
75 | /* Make the current CPU wait so it can enter the idle loop too. */ | |
76 | wait_event(suspend_freeze_wait_head, | |
77 | suspend_freeze_state == FREEZE_STATE_WAKE); | |
78 | pr_debug("PM: resume from suspend-to-idle\n"); | |
79 | ||
f3f12532 | 80 | cpuidle_pause(); |
38106313 RW |
81 | put_online_cpus(); |
82 | ||
83 | spin_lock_irq(&suspend_freeze_lock); | |
84 | ||
85 | out: | |
86 | suspend_freeze_state = FREEZE_STATE_NONE; | |
87 | spin_unlock_irq(&suspend_freeze_lock); | |
7e73c5ae ZR |
88 | } |
89 | ||
90 | void freeze_wake(void) | |
91 | { | |
38106313 RW |
92 | unsigned long flags; |
93 | ||
94 | spin_lock_irqsave(&suspend_freeze_lock, flags); | |
95 | if (suspend_freeze_state > FREEZE_STATE_NONE) { | |
96 | suspend_freeze_state = FREEZE_STATE_WAKE; | |
97 | wake_up(&suspend_freeze_wait_head); | |
98 | } | |
99 | spin_unlock_irqrestore(&suspend_freeze_lock, flags); | |
7e73c5ae ZR |
100 | } |
101 | EXPORT_SYMBOL_GPL(freeze_wake); | |
102 | ||
43e8317b RW |
103 | static bool valid_state(suspend_state_t state) |
104 | { | |
105 | /* | |
106 | * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level | |
107 | * support and need to be valid to the low level | |
108 | * implementation, no valid callback implies that none are valid. | |
109 | */ | |
110 | return suspend_ops && suspend_ops->valid && suspend_ops->valid(state); | |
111 | } | |
112 | ||
0399d4db RW |
113 | /* |
114 | * If this is set, the "mem" label always corresponds to the deepest sleep state | |
115 | * available, the "standby" label corresponds to the second deepest sleep state | |
116 | * available (if any), and the "freeze" label corresponds to the remaining | |
117 | * available sleep state (if there is one). | |
118 | */ | |
119 | static bool relative_states; | |
120 | ||
fa7fd6fa SH |
121 | void __init pm_states_init(void) |
122 | { | |
123 | /* | |
124 | * freeze state should be supported even without any suspend_ops, | |
125 | * initialize pm_states accordingly here | |
126 | */ | |
127 | pm_states[PM_SUSPEND_FREEZE] = pm_labels[relative_states ? 0 : 2]; | |
128 | } | |
129 | ||
0399d4db RW |
130 | static int __init sleep_states_setup(char *str) |
131 | { | |
132 | relative_states = !strncmp(str, "1", 1); | |
0399d4db RW |
133 | return 1; |
134 | } | |
135 | ||
136 | __setup("relative_sleep_states=", sleep_states_setup); | |
137 | ||
a9d70523 | 138 | /** |
55ae4519 RW |
139 | * suspend_set_ops - Set the global suspend method table. |
140 | * @ops: Suspend operations to use. | |
a9d70523 | 141 | */ |
2f55ac07 | 142 | void suspend_set_ops(const struct platform_suspend_ops *ops) |
a9d70523 | 143 | { |
43e8317b | 144 | suspend_state_t i; |
d431cbc5 | 145 | int j = 0; |
43e8317b | 146 | |
bcda53fa | 147 | lock_system_sleep(); |
43e8317b | 148 | |
a9d70523 | 149 | suspend_ops = ops; |
0399d4db | 150 | for (i = PM_SUSPEND_MEM; i >= PM_SUSPEND_STANDBY; i--) |
d431cbc5 RW |
151 | if (valid_state(i)) { |
152 | pm_states[i] = pm_labels[j++]; | |
153 | } else if (!relative_states) { | |
154 | pm_states[i] = NULL; | |
155 | j++; | |
156 | } | |
0399d4db | 157 | |
d431cbc5 | 158 | pm_states[PM_SUSPEND_FREEZE] = pm_labels[j]; |
43e8317b | 159 | |
bcda53fa | 160 | unlock_system_sleep(); |
a9d70523 | 161 | } |
a5e4fd87 | 162 | EXPORT_SYMBOL_GPL(suspend_set_ops); |
a9d70523 | 163 | |
a9d70523 | 164 | /** |
55ae4519 | 165 | * suspend_valid_only_mem - Generic memory-only valid callback. |
a9d70523 | 166 | * |
55ae4519 RW |
167 | * Platform drivers that implement mem suspend only and only need to check for |
168 | * that in their .valid() callback can use this instead of rolling their own | |
169 | * .valid() callback. | |
a9d70523 RW |
170 | */ |
171 | int suspend_valid_only_mem(suspend_state_t state) | |
172 | { | |
173 | return state == PM_SUSPEND_MEM; | |
174 | } | |
a5e4fd87 | 175 | EXPORT_SYMBOL_GPL(suspend_valid_only_mem); |
a9d70523 | 176 | |
8490fdf9 RW |
177 | static bool sleep_state_supported(suspend_state_t state) |
178 | { | |
179 | return state == PM_SUSPEND_FREEZE || (suspend_ops && suspend_ops->enter); | |
180 | } | |
181 | ||
182 | static int platform_suspend_prepare(suspend_state_t state) | |
183 | { | |
184 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare ? | |
185 | suspend_ops->prepare() : 0; | |
186 | } | |
187 | ||
a8d46b9e RW |
188 | static int platform_suspend_prepare_late(suspend_state_t state) |
189 | { | |
403b9636 | 190 | return state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->prepare ? |
a8d46b9e RW |
191 | freeze_ops->prepare() : 0; |
192 | } | |
193 | ||
ebc3e41e | 194 | static int platform_suspend_prepare_noirq(suspend_state_t state) |
8490fdf9 RW |
195 | { |
196 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare_late ? | |
197 | suspend_ops->prepare_late() : 0; | |
198 | } | |
199 | ||
ebc3e41e | 200 | static void platform_resume_noirq(suspend_state_t state) |
8490fdf9 RW |
201 | { |
202 | if (state != PM_SUSPEND_FREEZE && suspend_ops->wake) | |
203 | suspend_ops->wake(); | |
204 | } | |
205 | ||
a8d46b9e RW |
206 | static void platform_resume_early(suspend_state_t state) |
207 | { | |
403b9636 | 208 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->restore) |
a8d46b9e RW |
209 | freeze_ops->restore(); |
210 | } | |
211 | ||
ebc3e41e | 212 | static void platform_resume_finish(suspend_state_t state) |
8490fdf9 RW |
213 | { |
214 | if (state != PM_SUSPEND_FREEZE && suspend_ops->finish) | |
215 | suspend_ops->finish(); | |
216 | } | |
217 | ||
218 | static int platform_suspend_begin(suspend_state_t state) | |
219 | { | |
220 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->begin) | |
221 | return freeze_ops->begin(); | |
fa7fd6fa | 222 | else if (suspend_ops && suspend_ops->begin) |
8490fdf9 RW |
223 | return suspend_ops->begin(state); |
224 | else | |
225 | return 0; | |
226 | } | |
227 | ||
ebc3e41e | 228 | static void platform_resume_end(suspend_state_t state) |
8490fdf9 RW |
229 | { |
230 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->end) | |
231 | freeze_ops->end(); | |
fa7fd6fa | 232 | else if (suspend_ops && suspend_ops->end) |
8490fdf9 RW |
233 | suspend_ops->end(); |
234 | } | |
235 | ||
ebc3e41e | 236 | static void platform_recover(suspend_state_t state) |
8490fdf9 RW |
237 | { |
238 | if (state != PM_SUSPEND_FREEZE && suspend_ops->recover) | |
239 | suspend_ops->recover(); | |
240 | } | |
241 | ||
242 | static bool platform_suspend_again(suspend_state_t state) | |
243 | { | |
244 | return state != PM_SUSPEND_FREEZE && suspend_ops->suspend_again ? | |
245 | suspend_ops->suspend_again() : false; | |
246 | } | |
247 | ||
1d4a9c17 BN |
248 | #ifdef CONFIG_PM_DEBUG |
249 | static unsigned int pm_test_delay = 5; | |
250 | module_param(pm_test_delay, uint, 0644); | |
251 | MODULE_PARM_DESC(pm_test_delay, | |
252 | "Number of seconds to wait before resuming from suspend test"); | |
253 | #endif | |
254 | ||
a9d70523 RW |
255 | static int suspend_test(int level) |
256 | { | |
257 | #ifdef CONFIG_PM_DEBUG | |
258 | if (pm_test_level == level) { | |
22e09b33 | 259 | pr_info("suspend debug: Waiting for %d second(s).\n", |
1d4a9c17 BN |
260 | pm_test_delay); |
261 | mdelay(pm_test_delay * 1000); | |
a9d70523 RW |
262 | return 1; |
263 | } | |
264 | #endif /* !CONFIG_PM_DEBUG */ | |
265 | return 0; | |
266 | } | |
267 | ||
268 | /** | |
55ae4519 | 269 | * suspend_prepare - Prepare for entering system sleep state. |
a9d70523 | 270 | * |
55ae4519 RW |
271 | * Common code run for every system sleep state that can be entered (except for |
272 | * hibernation). Run suspend notifiers, allocate the "suspend" console and | |
273 | * freeze processes. | |
a9d70523 | 274 | */ |
7e73c5ae | 275 | static int suspend_prepare(suspend_state_t state) |
a9d70523 | 276 | { |
ea00f4f4 | 277 | int error, nr_calls = 0; |
a9d70523 | 278 | |
8490fdf9 | 279 | if (!sleep_state_supported(state)) |
a9d70523 RW |
280 | return -EPERM; |
281 | ||
282 | pm_prepare_console(); | |
283 | ||
ea00f4f4 LW |
284 | error = __pm_notifier_call_chain(PM_SUSPEND_PREPARE, -1, &nr_calls); |
285 | if (error) { | |
286 | nr_calls--; | |
a9d70523 | 287 | goto Finish; |
ea00f4f4 | 288 | } |
a9d70523 | 289 | |
bb3632c6 | 290 | trace_suspend_resume(TPS("freeze_processes"), 0, true); |
a9d70523 | 291 | error = suspend_freeze_processes(); |
bb3632c6 | 292 | trace_suspend_resume(TPS("freeze_processes"), 0, false); |
03afed8b | 293 | if (!error) |
a9d70523 RW |
294 | return 0; |
295 | ||
03afed8b TH |
296 | suspend_stats.failed_freeze++; |
297 | dpm_save_failed_step(SUSPEND_FREEZE); | |
a9d70523 | 298 | Finish: |
ea00f4f4 | 299 | __pm_notifier_call_chain(PM_POST_SUSPEND, nr_calls, NULL); |
a9d70523 RW |
300 | pm_restore_console(); |
301 | return error; | |
302 | } | |
303 | ||
304 | /* default implementation */ | |
52f5684c | 305 | void __weak arch_suspend_disable_irqs(void) |
a9d70523 RW |
306 | { |
307 | local_irq_disable(); | |
308 | } | |
309 | ||
310 | /* default implementation */ | |
52f5684c | 311 | void __weak arch_suspend_enable_irqs(void) |
a9d70523 RW |
312 | { |
313 | local_irq_enable(); | |
314 | } | |
315 | ||
316 | /** | |
55ae4519 RW |
317 | * suspend_enter - Make the system enter the given sleep state. |
318 | * @state: System sleep state to enter. | |
319 | * @wakeup: Returns information that the sleep state should not be re-entered. | |
a9d70523 | 320 | * |
3b5fe852 | 321 | * This function should be called after devices have been suspended. |
a9d70523 | 322 | */ |
3b5fe852 | 323 | static int suspend_enter(suspend_state_t state, bool *wakeup) |
a9d70523 RW |
324 | { |
325 | int error; | |
326 | ||
8490fdf9 RW |
327 | error = platform_suspend_prepare(state); |
328 | if (error) | |
329 | goto Platform_finish; | |
a9d70523 | 330 | |
2a8a8ce6 | 331 | error = dpm_suspend_late(PMSG_SUSPEND); |
a9d70523 | 332 | if (error) { |
22e09b33 | 333 | pr_err("PM: late suspend of devices failed\n"); |
ce441011 | 334 | goto Platform_finish; |
a9d70523 | 335 | } |
a8d46b9e RW |
336 | error = platform_suspend_prepare_late(state); |
337 | if (error) | |
338 | goto Devices_early_resume; | |
339 | ||
2a8a8ce6 RW |
340 | error = dpm_suspend_noirq(PMSG_SUSPEND); |
341 | if (error) { | |
22e09b33 | 342 | pr_err("PM: noirq suspend of devices failed\n"); |
a8d46b9e | 343 | goto Platform_early_resume; |
2a8a8ce6 | 344 | } |
ebc3e41e | 345 | error = platform_suspend_prepare_noirq(state); |
8490fdf9 RW |
346 | if (error) |
347 | goto Platform_wake; | |
a9d70523 | 348 | |
08605acc ZR |
349 | if (suspend_test(TEST_PLATFORM)) |
350 | goto Platform_wake; | |
351 | ||
7e73c5ae ZR |
352 | /* |
353 | * PM_SUSPEND_FREEZE equals | |
354 | * frozen processes + suspended devices + idle processors. | |
355 | * Thus we should invoke freeze_enter() soon after | |
356 | * all the devices are suspended. | |
357 | */ | |
358 | if (state == PM_SUSPEND_FREEZE) { | |
bb3632c6 | 359 | trace_suspend_resume(TPS("machine_suspend"), state, true); |
7e73c5ae | 360 | freeze_enter(); |
bb3632c6 | 361 | trace_suspend_resume(TPS("machine_suspend"), state, false); |
7e73c5ae ZR |
362 | goto Platform_wake; |
363 | } | |
364 | ||
a9d70523 RW |
365 | error = disable_nonboot_cpus(); |
366 | if (error || suspend_test(TEST_CPUS)) | |
367 | goto Enable_cpus; | |
368 | ||
369 | arch_suspend_disable_irqs(); | |
370 | BUG_ON(!irqs_disabled()); | |
371 | ||
2e711c04 | 372 | error = syscore_suspend(); |
a9d70523 | 373 | if (!error) { |
3b5fe852 MH |
374 | *wakeup = pm_wakeup_pending(); |
375 | if (!(suspend_test(TEST_CORE) || *wakeup)) { | |
bb3632c6 TB |
376 | trace_suspend_resume(TPS("machine_suspend"), |
377 | state, true); | |
a9d70523 | 378 | error = suspend_ops->enter(state); |
bb3632c6 TB |
379 | trace_suspend_resume(TPS("machine_suspend"), |
380 | state, false); | |
c125e96f | 381 | events_check_enabled = false; |
67176736 RK |
382 | } else if (*wakeup) { |
383 | error = -EBUSY; | |
c125e96f | 384 | } |
40dc166c | 385 | syscore_resume(); |
a9d70523 RW |
386 | } |
387 | ||
388 | arch_suspend_enable_irqs(); | |
389 | BUG_ON(irqs_disabled()); | |
390 | ||
391 | Enable_cpus: | |
392 | enable_nonboot_cpus(); | |
393 | ||
394 | Platform_wake: | |
ebc3e41e | 395 | platform_resume_noirq(state); |
2a8a8ce6 RW |
396 | dpm_resume_noirq(PMSG_RESUME); |
397 | ||
a8d46b9e RW |
398 | Platform_early_resume: |
399 | platform_resume_early(state); | |
400 | ||
2a8a8ce6 RW |
401 | Devices_early_resume: |
402 | dpm_resume_early(PMSG_RESUME); | |
a9d70523 | 403 | |
ce441011 | 404 | Platform_finish: |
ebc3e41e | 405 | platform_resume_finish(state); |
a9d70523 RW |
406 | return error; |
407 | } | |
408 | ||
409 | /** | |
55ae4519 RW |
410 | * suspend_devices_and_enter - Suspend devices and enter system sleep state. |
411 | * @state: System sleep state to enter. | |
a9d70523 RW |
412 | */ |
413 | int suspend_devices_and_enter(suspend_state_t state) | |
414 | { | |
415 | int error; | |
3b5fe852 | 416 | bool wakeup = false; |
a9d70523 | 417 | |
8490fdf9 | 418 | if (!sleep_state_supported(state)) |
a9d70523 RW |
419 | return -ENOSYS; |
420 | ||
8490fdf9 RW |
421 | error = platform_suspend_begin(state); |
422 | if (error) | |
423 | goto Close; | |
424 | ||
a9d70523 RW |
425 | suspend_console(); |
426 | suspend_test_start(); | |
427 | error = dpm_suspend_start(PMSG_SUSPEND); | |
428 | if (error) { | |
9350de06 | 429 | pr_err("PM: Some devices failed to suspend, or early wake event detected\n"); |
a9d70523 RW |
430 | goto Recover_platform; |
431 | } | |
432 | suspend_test_finish("suspend devices"); | |
433 | if (suspend_test(TEST_DEVICES)) | |
434 | goto Recover_platform; | |
435 | ||
3b5fe852 MH |
436 | do { |
437 | error = suspend_enter(state, &wakeup); | |
8490fdf9 | 438 | } while (!error && !wakeup && platform_suspend_again(state)); |
a9d70523 RW |
439 | |
440 | Resume_devices: | |
441 | suspend_test_start(); | |
442 | dpm_resume_end(PMSG_RESUME); | |
443 | suspend_test_finish("resume devices"); | |
0cadc702 | 444 | trace_suspend_resume(TPS("resume_console"), state, true); |
a9d70523 | 445 | resume_console(); |
0cadc702 | 446 | trace_suspend_resume(TPS("resume_console"), state, false); |
1f0b6386 | 447 | |
8490fdf9 | 448 | Close: |
ebc3e41e | 449 | platform_resume_end(state); |
a9d70523 RW |
450 | return error; |
451 | ||
452 | Recover_platform: | |
ebc3e41e | 453 | platform_recover(state); |
a9d70523 RW |
454 | goto Resume_devices; |
455 | } | |
456 | ||
457 | /** | |
55ae4519 | 458 | * suspend_finish - Clean up before finishing the suspend sequence. |
a9d70523 | 459 | * |
55ae4519 RW |
460 | * Call platform code to clean up, restart processes, and free the console that |
461 | * we've allocated. This routine is not called for hibernation. | |
a9d70523 RW |
462 | */ |
463 | static void suspend_finish(void) | |
464 | { | |
465 | suspend_thaw_processes(); | |
a9d70523 RW |
466 | pm_notifier_call_chain(PM_POST_SUSPEND); |
467 | pm_restore_console(); | |
468 | } | |
469 | ||
470 | /** | |
55ae4519 RW |
471 | * enter_state - Do common work needed to enter system sleep state. |
472 | * @state: System sleep state to enter. | |
a9d70523 | 473 | * |
55ae4519 RW |
474 | * Make sure that no one else is trying to put the system into a sleep state. |
475 | * Fail if that's not the case. Otherwise, prepare for system suspend, make the | |
476 | * system enter the given sleep state and clean up after wakeup. | |
a9d70523 | 477 | */ |
93e1ee43 | 478 | static int enter_state(suspend_state_t state) |
a9d70523 RW |
479 | { |
480 | int error; | |
481 | ||
bb3632c6 | 482 | trace_suspend_resume(TPS("suspend_enter"), state, true); |
43e8317b RW |
483 | if (state == PM_SUSPEND_FREEZE) { |
484 | #ifdef CONFIG_PM_DEBUG | |
485 | if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) { | |
a395d6a7 | 486 | pr_warn("PM: Unsupported test mode for suspend to idle, please choose none/freezer/devices/platform.\n"); |
43e8317b RW |
487 | return -EAGAIN; |
488 | } | |
489 | #endif | |
490 | } else if (!valid_state(state)) { | |
491 | return -EINVAL; | |
492 | } | |
a9d70523 RW |
493 | if (!mutex_trylock(&pm_mutex)) |
494 | return -EBUSY; | |
495 | ||
7e73c5ae ZR |
496 | if (state == PM_SUSPEND_FREEZE) |
497 | freeze_begin(); | |
498 | ||
2fd77fff | 499 | #ifndef CONFIG_SUSPEND_SKIP_SYNC |
bb3632c6 | 500 | trace_suspend_resume(TPS("sync_filesystems"), 0, true); |
1adb469b | 501 | pr_info("PM: Syncing filesystems ... "); |
a9d70523 | 502 | sys_sync(); |
1adb469b | 503 | pr_cont("done.\n"); |
bb3632c6 | 504 | trace_suspend_resume(TPS("sync_filesystems"), 0, false); |
2fd77fff | 505 | #endif |
a9d70523 | 506 | |
a9215045 | 507 | pr_debug("PM: Preparing system for sleep (%s)\n", pm_states[state]); |
ef25ba04 | 508 | pm_suspend_clear_flags(); |
7e73c5ae | 509 | error = suspend_prepare(state); |
a9d70523 RW |
510 | if (error) |
511 | goto Unlock; | |
512 | ||
513 | if (suspend_test(TEST_FREEZER)) | |
514 | goto Finish; | |
515 | ||
bb3632c6 | 516 | trace_suspend_resume(TPS("suspend_enter"), state, false); |
a9215045 | 517 | pr_debug("PM: Suspending system (%s)\n", pm_states[state]); |
87186475 | 518 | pm_restrict_gfp_mask(); |
a9d70523 | 519 | error = suspend_devices_and_enter(state); |
87186475 | 520 | pm_restore_gfp_mask(); |
a9d70523 RW |
521 | |
522 | Finish: | |
523 | pr_debug("PM: Finishing wakeup.\n"); | |
524 | suspend_finish(); | |
525 | Unlock: | |
526 | mutex_unlock(&pm_mutex); | |
527 | return error; | |
528 | } | |
529 | ||
530 | /** | |
55ae4519 RW |
531 | * pm_suspend - Externally visible function for suspending the system. |
532 | * @state: System sleep state to enter. | |
a9d70523 | 533 | * |
55ae4519 RW |
534 | * Check if the value of @state represents one of the supported states, |
535 | * execute enter_state() and update system suspend statistics. | |
a9d70523 RW |
536 | */ |
537 | int pm_suspend(suspend_state_t state) | |
538 | { | |
bc25cf50 RW |
539 | int error; |
540 | ||
541 | if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) | |
542 | return -EINVAL; | |
543 | ||
544 | error = enter_state(state); | |
545 | if (error) { | |
546 | suspend_stats.fail++; | |
547 | dpm_save_failed_errno(error); | |
548 | } else { | |
549 | suspend_stats.success++; | |
2a77c46d | 550 | } |
bc25cf50 | 551 | return error; |
a9d70523 RW |
552 | } |
553 | EXPORT_SYMBOL(pm_suspend); |