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95d9ffbe RW |
1 | #ifndef _LINUX_SUSPEND_H |
2 | #define _LINUX_SUSPEND_H | |
1da177e4 | 3 | |
1da177e4 LT |
4 | #include <linux/swap.h> |
5 | #include <linux/notifier.h> | |
1da177e4 LT |
6 | #include <linux/init.h> |
7 | #include <linux/pm.h> | |
7be98234 | 8 | #include <linux/mm.h> |
33e638b9 | 9 | #include <linux/freezer.h> |
95d9ffbe RW |
10 | #include <asm/errno.h> |
11 | ||
37cce26b | 12 | #ifdef CONFIG_VT |
b6f448e9 | 13 | extern void pm_set_vt_switch(int); |
95d9ffbe | 14 | #else |
b6f448e9 AS |
15 | static inline void pm_set_vt_switch(int do_switch) |
16 | { | |
17 | } | |
37cce26b | 18 | #endif |
b6f448e9 | 19 | |
37cce26b | 20 | #ifdef CONFIG_VT_CONSOLE_SLEEP |
ca5f2b4c | 21 | extern void pm_prepare_console(void); |
37cce26b HS |
22 | extern void pm_restore_console(void); |
23 | #else | |
ca5f2b4c | 24 | static inline void pm_prepare_console(void) |
b6f448e9 | 25 | { |
b6f448e9 AS |
26 | } |
27 | ||
28 | static inline void pm_restore_console(void) | |
29 | { | |
30 | } | |
95d9ffbe RW |
31 | #endif |
32 | ||
33 | typedef int __bitwise suspend_state_t; | |
34 | ||
35 | #define PM_SUSPEND_ON ((__force suspend_state_t) 0) | |
7e73c5ae ZR |
36 | #define PM_SUSPEND_FREEZE ((__force suspend_state_t) 1) |
37 | #define PM_SUSPEND_STANDBY ((__force suspend_state_t) 2) | |
95d9ffbe | 38 | #define PM_SUSPEND_MEM ((__force suspend_state_t) 3) |
7e73c5ae | 39 | #define PM_SUSPEND_MIN PM_SUSPEND_FREEZE |
95d9ffbe RW |
40 | #define PM_SUSPEND_MAX ((__force suspend_state_t) 4) |
41 | ||
2a77c46d SL |
42 | enum suspend_stat_step { |
43 | SUSPEND_FREEZE = 1, | |
44 | SUSPEND_PREPARE, | |
45 | SUSPEND_SUSPEND, | |
cf579dfb | 46 | SUSPEND_SUSPEND_LATE, |
2a77c46d SL |
47 | SUSPEND_SUSPEND_NOIRQ, |
48 | SUSPEND_RESUME_NOIRQ, | |
cf579dfb | 49 | SUSPEND_RESUME_EARLY, |
2a77c46d SL |
50 | SUSPEND_RESUME |
51 | }; | |
52 | ||
53 | struct suspend_stats { | |
54 | int success; | |
55 | int fail; | |
56 | int failed_freeze; | |
57 | int failed_prepare; | |
58 | int failed_suspend; | |
cf579dfb | 59 | int failed_suspend_late; |
2a77c46d SL |
60 | int failed_suspend_noirq; |
61 | int failed_resume; | |
cf579dfb | 62 | int failed_resume_early; |
2a77c46d SL |
63 | int failed_resume_noirq; |
64 | #define REC_FAILED_NUM 2 | |
65 | int last_failed_dev; | |
66 | char failed_devs[REC_FAILED_NUM][40]; | |
67 | int last_failed_errno; | |
68 | int errno[REC_FAILED_NUM]; | |
69 | int last_failed_step; | |
70 | enum suspend_stat_step failed_steps[REC_FAILED_NUM]; | |
71 | }; | |
72 | ||
73 | extern struct suspend_stats suspend_stats; | |
74 | ||
75 | static inline void dpm_save_failed_dev(const char *name) | |
76 | { | |
77 | strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev], | |
78 | name, | |
79 | sizeof(suspend_stats.failed_devs[0])); | |
80 | suspend_stats.last_failed_dev++; | |
81 | suspend_stats.last_failed_dev %= REC_FAILED_NUM; | |
82 | } | |
83 | ||
84 | static inline void dpm_save_failed_errno(int err) | |
85 | { | |
86 | suspend_stats.errno[suspend_stats.last_failed_errno] = err; | |
87 | suspend_stats.last_failed_errno++; | |
88 | suspend_stats.last_failed_errno %= REC_FAILED_NUM; | |
89 | } | |
90 | ||
91 | static inline void dpm_save_failed_step(enum suspend_stat_step step) | |
92 | { | |
93 | suspend_stats.failed_steps[suspend_stats.last_failed_step] = step; | |
94 | suspend_stats.last_failed_step++; | |
95 | suspend_stats.last_failed_step %= REC_FAILED_NUM; | |
96 | } | |
97 | ||
95d9ffbe | 98 | /** |
26398a70 RW |
99 | * struct platform_suspend_ops - Callbacks for managing platform dependent |
100 | * system sleep states. | |
95d9ffbe RW |
101 | * |
102 | * @valid: Callback to determine if given system sleep state is supported by | |
103 | * the platform. | |
104 | * Valid (ie. supported) states are advertised in /sys/power/state. Note | |
105 | * that it still may be impossible to enter given system sleep state if the | |
106 | * conditions aren't right. | |
26398a70 RW |
107 | * There is the %suspend_valid_only_mem function available that can be |
108 | * assigned to this if the platform only supports mem sleep. | |
95d9ffbe | 109 | * |
c697eece RW |
110 | * @begin: Initialise a transition to given system sleep state. |
111 | * @begin() is executed right prior to suspending devices. The information | |
112 | * conveyed to the platform code by @begin() should be disregarded by it as | |
113 | * soon as @end() is executed. If @begin() fails (ie. returns nonzero), | |
95d9ffbe RW |
114 | * @prepare(), @enter() and @finish() will not be called by the PM core. |
115 | * This callback is optional. However, if it is implemented, the argument | |
c697eece | 116 | * passed to @enter() is redundant and should be ignored. |
95d9ffbe RW |
117 | * |
118 | * @prepare: Prepare the platform for entering the system sleep state indicated | |
c697eece | 119 | * by @begin(). |
95d9ffbe RW |
120 | * @prepare() is called right after devices have been suspended (ie. the |
121 | * appropriate .suspend() method has been executed for each device) and | |
6a7c7eaf RW |
122 | * before device drivers' late suspend callbacks are executed. It returns |
123 | * 0 on success or a negative error code otherwise, in which case the | |
124 | * system cannot enter the desired sleep state (@prepare_late(), @enter(), | |
ce441011 | 125 | * and @wake() will not be called in that case). |
6a7c7eaf RW |
126 | * |
127 | * @prepare_late: Finish preparing the platform for entering the system sleep | |
128 | * state indicated by @begin(). | |
129 | * @prepare_late is called before disabling nonboot CPUs and after | |
130 | * device drivers' late suspend callbacks have been executed. It returns | |
131 | * 0 on success or a negative error code otherwise, in which case the | |
ce441011 RW |
132 | * system cannot enter the desired sleep state (@enter() will not be |
133 | * executed). | |
95d9ffbe | 134 | * |
c697eece RW |
135 | * @enter: Enter the system sleep state indicated by @begin() or represented by |
136 | * the argument if @begin() is not implemented. | |
95d9ffbe RW |
137 | * This callback is mandatory. It returns 0 on success or a negative |
138 | * error code otherwise, in which case the system cannot enter the desired | |
139 | * sleep state. | |
140 | * | |
6a7c7eaf RW |
141 | * @wake: Called when the system has just left a sleep state, right after |
142 | * the nonboot CPUs have been enabled and before device drivers' early | |
143 | * resume callbacks are executed. | |
144 | * This callback is optional, but should be implemented by the platforms | |
145 | * that implement @prepare_late(). If implemented, it is always called | |
ce441011 | 146 | * after @prepare_late and @enter(), even if one of them fails. |
6a7c7eaf RW |
147 | * |
148 | * @finish: Finish wake-up of the platform. | |
149 | * @finish is called right prior to calling device drivers' regular suspend | |
150 | * callbacks. | |
95d9ffbe RW |
151 | * This callback is optional, but should be implemented by the platforms |
152 | * that implement @prepare(). If implemented, it is always called after | |
ce441011 RW |
153 | * @enter() and @wake(), even if any of them fails. It is executed after |
154 | * a failing @prepare. | |
c697eece | 155 | * |
3b5fe852 MH |
156 | * @suspend_again: Returns whether the system should suspend again (true) or |
157 | * not (false). If the platform wants to poll sensors or execute some | |
158 | * code during suspended without invoking userspace and most of devices, | |
159 | * suspend_again callback is the place assuming that periodic-wakeup or | |
160 | * alarm-wakeup is already setup. This allows to execute some codes while | |
161 | * being kept suspended in the view of userland and devices. | |
162 | * | |
c697eece RW |
163 | * @end: Called by the PM core right after resuming devices, to indicate to |
164 | * the platform that the system has returned to the working state or | |
165 | * the transition to the sleep state has been aborted. | |
166 | * This callback is optional, but should be implemented by the platforms | |
6a7c7eaf RW |
167 | * that implement @begin(). Accordingly, platforms implementing @begin() |
168 | * should also provide a @end() which cleans up transitions aborted before | |
c697eece | 169 | * @enter(). |
d8f3de0d RW |
170 | * |
171 | * @recover: Recover the platform from a suspend failure. | |
172 | * Called by the PM core if the suspending of devices fails. | |
173 | * This callback is optional and should only be implemented by platforms | |
174 | * which require special recovery actions in that situation. | |
95d9ffbe | 175 | */ |
26398a70 | 176 | struct platform_suspend_ops { |
95d9ffbe | 177 | int (*valid)(suspend_state_t state); |
c697eece | 178 | int (*begin)(suspend_state_t state); |
e6c5eb95 | 179 | int (*prepare)(void); |
6a7c7eaf | 180 | int (*prepare_late)(void); |
95d9ffbe | 181 | int (*enter)(suspend_state_t state); |
6a7c7eaf | 182 | void (*wake)(void); |
e6c5eb95 | 183 | void (*finish)(void); |
3b5fe852 | 184 | bool (*suspend_again)(void); |
c697eece | 185 | void (*end)(void); |
d8f3de0d | 186 | void (*recover)(void); |
95d9ffbe RW |
187 | }; |
188 | ||
1f0b6386 RW |
189 | struct platform_freeze_ops { |
190 | int (*begin)(void); | |
a8d46b9e RW |
191 | int (*prepare)(void); |
192 | void (*restore)(void); | |
1f0b6386 RW |
193 | void (*end)(void); |
194 | }; | |
195 | ||
95d9ffbe | 196 | #ifdef CONFIG_SUSPEND |
95d9ffbe | 197 | /** |
26398a70 RW |
198 | * suspend_set_ops - set platform dependent suspend operations |
199 | * @ops: The new suspend operations to set. | |
95d9ffbe | 200 | */ |
2f55ac07 | 201 | extern void suspend_set_ops(const struct platform_suspend_ops *ops); |
26398a70 | 202 | extern int suspend_valid_only_mem(suspend_state_t state); |
38106313 | 203 | |
ef25ba04 RW |
204 | extern unsigned int pm_suspend_global_flags; |
205 | ||
206 | #define PM_SUSPEND_FLAG_FW_SUSPEND (1 << 0) | |
207 | #define PM_SUSPEND_FLAG_FW_RESUME (1 << 1) | |
208 | ||
209 | static inline void pm_suspend_clear_flags(void) | |
210 | { | |
211 | pm_suspend_global_flags = 0; | |
212 | } | |
213 | ||
214 | static inline void pm_set_suspend_via_firmware(void) | |
215 | { | |
216 | pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND; | |
217 | } | |
218 | ||
219 | static inline void pm_set_resume_via_firmware(void) | |
220 | { | |
221 | pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME; | |
222 | } | |
223 | ||
224 | static inline bool pm_suspend_via_firmware(void) | |
225 | { | |
226 | return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND); | |
227 | } | |
228 | ||
229 | static inline bool pm_resume_via_firmware(void) | |
230 | { | |
231 | return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME); | |
232 | } | |
233 | ||
38106313 RW |
234 | /* Suspend-to-idle state machnine. */ |
235 | enum freeze_state { | |
236 | FREEZE_STATE_NONE, /* Not suspended/suspending. */ | |
237 | FREEZE_STATE_ENTER, /* Enter suspend-to-idle. */ | |
238 | FREEZE_STATE_WAKE, /* Wake up from suspend-to-idle. */ | |
239 | }; | |
240 | ||
241 | extern enum freeze_state __read_mostly suspend_freeze_state; | |
242 | ||
243 | static inline bool idle_should_freeze(void) | |
244 | { | |
245 | return unlikely(suspend_freeze_state == FREEZE_STATE_ENTER); | |
246 | } | |
247 | ||
fa7fd6fa | 248 | extern void __init pm_states_init(void); |
1f0b6386 | 249 | extern void freeze_set_ops(const struct platform_freeze_ops *ops); |
7e73c5ae | 250 | extern void freeze_wake(void); |
95d9ffbe RW |
251 | |
252 | /** | |
253 | * arch_suspend_disable_irqs - disable IRQs for suspend | |
254 | * | |
255 | * Disables IRQs (in the default case). This is a weak symbol in the common | |
256 | * code and thus allows architectures to override it if more needs to be | |
257 | * done. Not called for suspend to disk. | |
258 | */ | |
259 | extern void arch_suspend_disable_irqs(void); | |
260 | ||
261 | /** | |
262 | * arch_suspend_enable_irqs - enable IRQs after suspend | |
263 | * | |
264 | * Enables IRQs (in the default case). This is a weak symbol in the common | |
265 | * code and thus allows architectures to override it if more needs to be | |
266 | * done. Not called for suspend to disk. | |
267 | */ | |
268 | extern void arch_suspend_enable_irqs(void); | |
269 | ||
270 | extern int pm_suspend(suspend_state_t state); | |
271 | #else /* !CONFIG_SUSPEND */ | |
272 | #define suspend_valid_only_mem NULL | |
273 | ||
ef25ba04 RW |
274 | static inline void pm_suspend_clear_flags(void) {} |
275 | static inline void pm_set_suspend_via_firmware(void) {} | |
276 | static inline void pm_set_resume_via_firmware(void) {} | |
277 | static inline bool pm_suspend_via_firmware(void) { return false; } | |
278 | static inline bool pm_resume_via_firmware(void) { return false; } | |
279 | ||
2f55ac07 | 280 | static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {} |
95d9ffbe | 281 | static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; } |
38106313 | 282 | static inline bool idle_should_freeze(void) { return false; } |
fa7fd6fa | 283 | static inline void __init pm_states_init(void) {} |
1f0b6386 | 284 | static inline void freeze_set_ops(const struct platform_freeze_ops *ops) {} |
7e73c5ae | 285 | static inline void freeze_wake(void) {} |
95d9ffbe | 286 | #endif /* !CONFIG_SUSPEND */ |
1da177e4 | 287 | |
8357376d RW |
288 | /* struct pbe is used for creating lists of pages that should be restored |
289 | * atomically during the resume from disk, because the page frames they have | |
290 | * occupied before the suspend are in use. | |
291 | */ | |
dcbb5a54 | 292 | struct pbe { |
8357376d RW |
293 | void *address; /* address of the copy */ |
294 | void *orig_address; /* original address of a page */ | |
7088a5c0 | 295 | struct pbe *next; |
dcbb5a54 | 296 | }; |
1da177e4 | 297 | |
1da177e4 | 298 | /* mm/page_alloc.c */ |
1da177e4 LT |
299 | extern void mark_free_pages(struct zone *zone); |
300 | ||
a3d25c27 | 301 | /** |
b3dac3b3 | 302 | * struct platform_hibernation_ops - hibernation platform support |
a3d25c27 | 303 | * |
caea99ef RW |
304 | * The methods in this structure allow a platform to carry out special |
305 | * operations required by it during a hibernation transition. | |
a3d25c27 | 306 | * |
d8f3de0d | 307 | * All the methods below, except for @recover(), must be implemented. |
a3d25c27 | 308 | * |
caea99ef | 309 | * @begin: Tell the platform driver that we're starting hibernation. |
74f270af RW |
310 | * Called right after shrinking memory and before freezing devices. |
311 | * | |
caea99ef RW |
312 | * @end: Called by the PM core right after resuming devices, to indicate to |
313 | * the platform that the system has returned to the working state. | |
314 | * | |
74f270af RW |
315 | * @pre_snapshot: Prepare the platform for creating the hibernation image. |
316 | * Called right after devices have been frozen and before the nonboot | |
317 | * CPUs are disabled (runs with IRQs on). | |
318 | * | |
319 | * @finish: Restore the previous state of the platform after the hibernation | |
320 | * image has been created *or* put the platform into the normal operation | |
321 | * mode after the hibernation (the same method is executed in both cases). | |
322 | * Called right after the nonboot CPUs have been enabled and before | |
323 | * thawing devices (runs with IRQs on). | |
324 | * | |
325 | * @prepare: Prepare the platform for entering the low power state. | |
326 | * Called right after the hibernation image has been saved and before | |
327 | * devices are prepared for entering the low power state. | |
328 | * | |
329 | * @enter: Put the system into the low power state after the hibernation image | |
330 | * has been saved to disk. | |
331 | * Called after the nonboot CPUs have been disabled and all of the low | |
332 | * level devices have been shut down (runs with IRQs off). | |
333 | * | |
c7e0831d RW |
334 | * @leave: Perform the first stage of the cleanup after the system sleep state |
335 | * indicated by @set_target() has been left. | |
336 | * Called right after the control has been passed from the boot kernel to | |
337 | * the image kernel, before the nonboot CPUs are enabled and before devices | |
338 | * are resumed. Executed with interrupts disabled. | |
339 | * | |
74f270af RW |
340 | * @pre_restore: Prepare system for the restoration from a hibernation image. |
341 | * Called right after devices have been frozen and before the nonboot | |
342 | * CPUs are disabled (runs with IRQs on). | |
343 | * | |
344 | * @restore_cleanup: Clean up after a failing image restoration. | |
345 | * Called right after the nonboot CPUs have been enabled and before | |
346 | * thawing devices (runs with IRQs on). | |
d8f3de0d RW |
347 | * |
348 | * @recover: Recover the platform from a failure to suspend devices. | |
349 | * Called by the PM core if the suspending of devices during hibernation | |
350 | * fails. This callback is optional and should only be implemented by | |
351 | * platforms which require special recovery actions in that situation. | |
a3d25c27 | 352 | */ |
b3dac3b3 | 353 | struct platform_hibernation_ops { |
caea99ef RW |
354 | int (*begin)(void); |
355 | void (*end)(void); | |
74f270af RW |
356 | int (*pre_snapshot)(void); |
357 | void (*finish)(void); | |
a3d25c27 RW |
358 | int (*prepare)(void); |
359 | int (*enter)(void); | |
c7e0831d | 360 | void (*leave)(void); |
a634cc10 RW |
361 | int (*pre_restore)(void); |
362 | void (*restore_cleanup)(void); | |
d8f3de0d | 363 | void (*recover)(void); |
a3d25c27 RW |
364 | }; |
365 | ||
b0cb1a19 | 366 | #ifdef CONFIG_HIBERNATION |
74dfd666 | 367 | /* kernel/power/snapshot.c */ |
940d67f6 | 368 | extern void __register_nosave_region(unsigned long b, unsigned long e, int km); |
ce289e89 | 369 | static inline void __init register_nosave_region(unsigned long b, unsigned long e) |
940d67f6 JB |
370 | { |
371 | __register_nosave_region(b, e, 0); | |
372 | } | |
ce289e89 | 373 | static inline void __init register_nosave_region_late(unsigned long b, unsigned long e) |
940d67f6 JB |
374 | { |
375 | __register_nosave_region(b, e, 1); | |
376 | } | |
74dfd666 RW |
377 | extern int swsusp_page_is_forbidden(struct page *); |
378 | extern void swsusp_set_page_free(struct page *); | |
379 | extern void swsusp_unset_page_free(struct page *); | |
380 | extern unsigned long get_safe_page(gfp_t gfp_mask); | |
a3d25c27 | 381 | |
073ef1f6 | 382 | extern void hibernation_set_ops(const struct platform_hibernation_ops *ops); |
a3d25c27 | 383 | extern int hibernate(void); |
abfe2d7b | 384 | extern bool system_entering_hibernation(void); |
a6e15a39 | 385 | extern bool hibernation_available(void); |
603fb42a SC |
386 | asmlinkage int swsusp_save(void); |
387 | extern struct pbe *restore_pblist; | |
b0cb1a19 | 388 | #else /* CONFIG_HIBERNATION */ |
1f112cee RW |
389 | static inline void register_nosave_region(unsigned long b, unsigned long e) {} |
390 | static inline void register_nosave_region_late(unsigned long b, unsigned long e) {} | |
74dfd666 RW |
391 | static inline int swsusp_page_is_forbidden(struct page *p) { return 0; } |
392 | static inline void swsusp_set_page_free(struct page *p) {} | |
393 | static inline void swsusp_unset_page_free(struct page *p) {} | |
a3d25c27 | 394 | |
073ef1f6 | 395 | static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {} |
a3d25c27 | 396 | static inline int hibernate(void) { return -ENOSYS; } |
fce2b111 | 397 | static inline bool system_entering_hibernation(void) { return false; } |
a6e15a39 | 398 | static inline bool hibernation_available(void) { return false; } |
fce2b111 CH |
399 | #endif /* CONFIG_HIBERNATION */ |
400 | ||
35eb6db1 AW |
401 | /* Hibernation and suspend events */ |
402 | #define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */ | |
403 | #define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */ | |
404 | #define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */ | |
405 | #define PM_POST_SUSPEND 0x0004 /* Suspend finished */ | |
406 | #define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */ | |
407 | #define PM_POST_RESTORE 0x0006 /* Restore failed */ | |
408 | ||
9b6fc5dc SB |
409 | extern struct mutex pm_mutex; |
410 | ||
296699de | 411 | #ifdef CONFIG_PM_SLEEP |
1da177e4 LT |
412 | void save_processor_state(void); |
413 | void restore_processor_state(void); | |
25761b6e | 414 | |
b10d9117 | 415 | /* kernel/power/main.c */ |
82525756 AS |
416 | extern int register_pm_notifier(struct notifier_block *nb); |
417 | extern int unregister_pm_notifier(struct notifier_block *nb); | |
b10d9117 RW |
418 | |
419 | #define pm_notifier(fn, pri) { \ | |
420 | static struct notifier_block fn##_nb = \ | |
421 | { .notifier_call = fn, .priority = pri }; \ | |
422 | register_pm_notifier(&fn##_nb); \ | |
423 | } | |
c125e96f RW |
424 | |
425 | /* drivers/base/power/wakeup.c */ | |
426 | extern bool events_check_enabled; | |
a6f5f0dd | 427 | extern unsigned int pm_wakeup_irq; |
c125e96f | 428 | |
a2867e08 | 429 | extern bool pm_wakeup_pending(void); |
068765ba RW |
430 | extern void pm_system_wakeup(void); |
431 | extern void pm_wakeup_clear(void); | |
a6f5f0dd | 432 | extern void pm_system_irq_wakeup(unsigned int irq_number); |
7483b4a4 | 433 | extern bool pm_get_wakeup_count(unsigned int *count, bool block); |
074037ec | 434 | extern bool pm_save_wakeup_count(unsigned int count); |
55850945 | 435 | extern void pm_wakep_autosleep_enabled(bool set); |
bb177fed | 436 | extern void pm_print_active_wakeup_sources(void); |
9b6fc5dc SB |
437 | |
438 | static inline void lock_system_sleep(void) | |
439 | { | |
72081624 | 440 | current->flags |= PF_FREEZER_SKIP; |
9b6fc5dc SB |
441 | mutex_lock(&pm_mutex); |
442 | } | |
443 | ||
444 | static inline void unlock_system_sleep(void) | |
445 | { | |
72081624 SB |
446 | /* |
447 | * Don't use freezer_count() because we don't want the call to | |
448 | * try_to_freeze() here. | |
449 | * | |
450 | * Reason: | |
451 | * Fundamentally, we just don't need it, because freezing condition | |
452 | * doesn't come into effect until we release the pm_mutex lock, | |
453 | * since the freezer always works with pm_mutex held. | |
454 | * | |
455 | * More importantly, in the case of hibernation, | |
456 | * unlock_system_sleep() gets called in snapshot_read() and | |
457 | * snapshot_write() when the freezing condition is still in effect. | |
458 | * Which means, if we use try_to_freeze() here, it would make them | |
459 | * enter the refrigerator, thus causing hibernation to lockup. | |
460 | */ | |
461 | current->flags &= ~PF_FREEZER_SKIP; | |
9b6fc5dc | 462 | mutex_unlock(&pm_mutex); |
9b6fc5dc SB |
463 | } |
464 | ||
296699de | 465 | #else /* !CONFIG_PM_SLEEP */ |
b10d9117 RW |
466 | |
467 | static inline int register_pm_notifier(struct notifier_block *nb) | |
468 | { | |
469 | return 0; | |
470 | } | |
471 | ||
472 | static inline int unregister_pm_notifier(struct notifier_block *nb) | |
473 | { | |
474 | return 0; | |
475 | } | |
476 | ||
477 | #define pm_notifier(fn, pri) do { (void)(fn); } while (0) | |
dbeeec5f | 478 | |
a2867e08 | 479 | static inline bool pm_wakeup_pending(void) { return false; } |
068765ba RW |
480 | static inline void pm_system_wakeup(void) {} |
481 | static inline void pm_wakeup_clear(void) {} | |
a6f5f0dd | 482 | static inline void pm_system_irq_wakeup(unsigned int irq_number) {} |
6ad696d2 | 483 | |
6ad696d2 AK |
484 | static inline void lock_system_sleep(void) {} |
485 | static inline void unlock_system_sleep(void) {} | |
486 | ||
9b6fc5dc | 487 | #endif /* !CONFIG_PM_SLEEP */ |
89081d17 | 488 | |
b2df1d4f RW |
489 | #ifdef CONFIG_PM_SLEEP_DEBUG |
490 | extern bool pm_print_times_enabled; | |
491 | #else | |
492 | #define pm_print_times_enabled (false) | |
493 | #endif | |
494 | ||
7483b4a4 RW |
495 | #ifdef CONFIG_PM_AUTOSLEEP |
496 | ||
497 | /* kernel/power/autosleep.c */ | |
498 | void queue_up_suspend_work(void); | |
499 | ||
500 | #else /* !CONFIG_PM_AUTOSLEEP */ | |
501 | ||
502 | static inline void queue_up_suspend_work(void) {} | |
503 | ||
504 | #endif /* !CONFIG_PM_AUTOSLEEP */ | |
505 | ||
85055dd8 MS |
506 | #ifdef CONFIG_ARCH_SAVE_PAGE_KEYS |
507 | /* | |
508 | * The ARCH_SAVE_PAGE_KEYS functions can be used by an architecture | |
509 | * to save/restore additional information to/from the array of page | |
510 | * frame numbers in the hibernation image. For s390 this is used to | |
511 | * save and restore the storage key for each page that is included | |
512 | * in the hibernation image. | |
513 | */ | |
514 | unsigned long page_key_additional_pages(unsigned long pages); | |
515 | int page_key_alloc(unsigned long pages); | |
516 | void page_key_free(void); | |
517 | void page_key_read(unsigned long *pfn); | |
518 | void page_key_memorize(unsigned long *pfn); | |
519 | void page_key_write(void *address); | |
520 | ||
521 | #else /* !CONFIG_ARCH_SAVE_PAGE_KEYS */ | |
522 | ||
523 | static inline unsigned long page_key_additional_pages(unsigned long pages) | |
524 | { | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static inline int page_key_alloc(unsigned long pages) | |
529 | { | |
530 | return 0; | |
531 | } | |
532 | ||
533 | static inline void page_key_free(void) {} | |
534 | static inline void page_key_read(unsigned long *pfn) {} | |
535 | static inline void page_key_memorize(unsigned long *pfn) {} | |
536 | static inline void page_key_write(void *address) {} | |
537 | ||
538 | #endif /* !CONFIG_ARCH_SAVE_PAGE_KEYS */ | |
539 | ||
95d9ffbe | 540 | #endif /* _LINUX_SUSPEND_H */ |