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