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