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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> |
95d9ffbe RW |
9 | #include <asm/errno.h> |
10 | ||
11 | #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) | |
b6f448e9 | 12 | extern void pm_set_vt_switch(int); |
95d9ffbe RW |
13 | extern int pm_prepare_console(void); |
14 | extern void pm_restore_console(void); | |
15 | #else | |
b6f448e9 AS |
16 | static inline void pm_set_vt_switch(int do_switch) |
17 | { | |
18 | } | |
19 | ||
20 | static inline int pm_prepare_console(void) | |
21 | { | |
22 | return 0; | |
23 | } | |
24 | ||
25 | static inline void pm_restore_console(void) | |
26 | { | |
27 | } | |
95d9ffbe RW |
28 | #endif |
29 | ||
30 | typedef int __bitwise suspend_state_t; | |
31 | ||
32 | #define PM_SUSPEND_ON ((__force suspend_state_t) 0) | |
33 | #define PM_SUSPEND_STANDBY ((__force suspend_state_t) 1) | |
34 | #define PM_SUSPEND_MEM ((__force suspend_state_t) 3) | |
35 | #define PM_SUSPEND_MAX ((__force suspend_state_t) 4) | |
36 | ||
2a77c46d SL |
37 | enum suspend_stat_step { |
38 | SUSPEND_FREEZE = 1, | |
39 | SUSPEND_PREPARE, | |
40 | SUSPEND_SUSPEND, | |
41 | SUSPEND_SUSPEND_NOIRQ, | |
42 | SUSPEND_RESUME_NOIRQ, | |
43 | SUSPEND_RESUME | |
44 | }; | |
45 | ||
46 | struct suspend_stats { | |
47 | int success; | |
48 | int fail; | |
49 | int failed_freeze; | |
50 | int failed_prepare; | |
51 | int failed_suspend; | |
52 | int failed_suspend_noirq; | |
53 | int failed_resume; | |
54 | int failed_resume_noirq; | |
55 | #define REC_FAILED_NUM 2 | |
56 | int last_failed_dev; | |
57 | char failed_devs[REC_FAILED_NUM][40]; | |
58 | int last_failed_errno; | |
59 | int errno[REC_FAILED_NUM]; | |
60 | int last_failed_step; | |
61 | enum suspend_stat_step failed_steps[REC_FAILED_NUM]; | |
62 | }; | |
63 | ||
64 | extern struct suspend_stats suspend_stats; | |
65 | ||
66 | static inline void dpm_save_failed_dev(const char *name) | |
67 | { | |
68 | strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev], | |
69 | name, | |
70 | sizeof(suspend_stats.failed_devs[0])); | |
71 | suspend_stats.last_failed_dev++; | |
72 | suspend_stats.last_failed_dev %= REC_FAILED_NUM; | |
73 | } | |
74 | ||
75 | static inline void dpm_save_failed_errno(int err) | |
76 | { | |
77 | suspend_stats.errno[suspend_stats.last_failed_errno] = err; | |
78 | suspend_stats.last_failed_errno++; | |
79 | suspend_stats.last_failed_errno %= REC_FAILED_NUM; | |
80 | } | |
81 | ||
82 | static inline void dpm_save_failed_step(enum suspend_stat_step step) | |
83 | { | |
84 | suspend_stats.failed_steps[suspend_stats.last_failed_step] = step; | |
85 | suspend_stats.last_failed_step++; | |
86 | suspend_stats.last_failed_step %= REC_FAILED_NUM; | |
87 | } | |
88 | ||
95d9ffbe | 89 | /** |
26398a70 RW |
90 | * struct platform_suspend_ops - Callbacks for managing platform dependent |
91 | * system sleep states. | |
95d9ffbe RW |
92 | * |
93 | * @valid: Callback to determine if given system sleep state is supported by | |
94 | * the platform. | |
95 | * Valid (ie. supported) states are advertised in /sys/power/state. Note | |
96 | * that it still may be impossible to enter given system sleep state if the | |
97 | * conditions aren't right. | |
26398a70 RW |
98 | * There is the %suspend_valid_only_mem function available that can be |
99 | * assigned to this if the platform only supports mem sleep. | |
95d9ffbe | 100 | * |
c697eece RW |
101 | * @begin: Initialise a transition to given system sleep state. |
102 | * @begin() is executed right prior to suspending devices. The information | |
103 | * conveyed to the platform code by @begin() should be disregarded by it as | |
104 | * soon as @end() is executed. If @begin() fails (ie. returns nonzero), | |
95d9ffbe RW |
105 | * @prepare(), @enter() and @finish() will not be called by the PM core. |
106 | * This callback is optional. However, if it is implemented, the argument | |
c697eece | 107 | * passed to @enter() is redundant and should be ignored. |
95d9ffbe RW |
108 | * |
109 | * @prepare: Prepare the platform for entering the system sleep state indicated | |
c697eece | 110 | * by @begin(). |
95d9ffbe RW |
111 | * @prepare() is called right after devices have been suspended (ie. the |
112 | * appropriate .suspend() method has been executed for each device) and | |
6a7c7eaf RW |
113 | * before device drivers' late suspend callbacks are executed. It returns |
114 | * 0 on success or a negative error code otherwise, in which case the | |
115 | * system cannot enter the desired sleep state (@prepare_late(), @enter(), | |
ce441011 | 116 | * and @wake() will not be called in that case). |
6a7c7eaf RW |
117 | * |
118 | * @prepare_late: Finish preparing the platform for entering the system sleep | |
119 | * state indicated by @begin(). | |
120 | * @prepare_late is called before disabling nonboot CPUs and after | |
121 | * device drivers' late suspend callbacks have been executed. It returns | |
122 | * 0 on success or a negative error code otherwise, in which case the | |
ce441011 RW |
123 | * system cannot enter the desired sleep state (@enter() will not be |
124 | * executed). | |
95d9ffbe | 125 | * |
c697eece RW |
126 | * @enter: Enter the system sleep state indicated by @begin() or represented by |
127 | * the argument if @begin() is not implemented. | |
95d9ffbe RW |
128 | * This callback is mandatory. It returns 0 on success or a negative |
129 | * error code otherwise, in which case the system cannot enter the desired | |
130 | * sleep state. | |
131 | * | |
6a7c7eaf RW |
132 | * @wake: Called when the system has just left a sleep state, right after |
133 | * the nonboot CPUs have been enabled and before device drivers' early | |
134 | * resume callbacks are executed. | |
135 | * This callback is optional, but should be implemented by the platforms | |
136 | * that implement @prepare_late(). If implemented, it is always called | |
ce441011 | 137 | * after @prepare_late and @enter(), even if one of them fails. |
6a7c7eaf RW |
138 | * |
139 | * @finish: Finish wake-up of the platform. | |
140 | * @finish is called right prior to calling device drivers' regular suspend | |
141 | * callbacks. | |
95d9ffbe RW |
142 | * This callback is optional, but should be implemented by the platforms |
143 | * that implement @prepare(). If implemented, it is always called after | |
ce441011 RW |
144 | * @enter() and @wake(), even if any of them fails. It is executed after |
145 | * a failing @prepare. | |
c697eece | 146 | * |
3b5fe852 MH |
147 | * @suspend_again: Returns whether the system should suspend again (true) or |
148 | * not (false). If the platform wants to poll sensors or execute some | |
149 | * code during suspended without invoking userspace and most of devices, | |
150 | * suspend_again callback is the place assuming that periodic-wakeup or | |
151 | * alarm-wakeup is already setup. This allows to execute some codes while | |
152 | * being kept suspended in the view of userland and devices. | |
153 | * | |
c697eece RW |
154 | * @end: Called by the PM core right after resuming devices, to indicate to |
155 | * the platform that the system has returned to the working state or | |
156 | * the transition to the sleep state has been aborted. | |
157 | * This callback is optional, but should be implemented by the platforms | |
6a7c7eaf RW |
158 | * that implement @begin(). Accordingly, platforms implementing @begin() |
159 | * should also provide a @end() which cleans up transitions aborted before | |
c697eece | 160 | * @enter(). |
d8f3de0d RW |
161 | * |
162 | * @recover: Recover the platform from a suspend failure. | |
163 | * Called by the PM core if the suspending of devices fails. | |
164 | * This callback is optional and should only be implemented by platforms | |
165 | * which require special recovery actions in that situation. | |
95d9ffbe | 166 | */ |
26398a70 | 167 | struct platform_suspend_ops { |
95d9ffbe | 168 | int (*valid)(suspend_state_t state); |
c697eece | 169 | int (*begin)(suspend_state_t state); |
e6c5eb95 | 170 | int (*prepare)(void); |
6a7c7eaf | 171 | int (*prepare_late)(void); |
95d9ffbe | 172 | int (*enter)(suspend_state_t state); |
6a7c7eaf | 173 | void (*wake)(void); |
e6c5eb95 | 174 | void (*finish)(void); |
3b5fe852 | 175 | bool (*suspend_again)(void); |
c697eece | 176 | void (*end)(void); |
d8f3de0d | 177 | void (*recover)(void); |
95d9ffbe RW |
178 | }; |
179 | ||
180 | #ifdef CONFIG_SUSPEND | |
95d9ffbe | 181 | /** |
26398a70 RW |
182 | * suspend_set_ops - set platform dependent suspend operations |
183 | * @ops: The new suspend operations to set. | |
95d9ffbe | 184 | */ |
2f55ac07 | 185 | extern void suspend_set_ops(const struct platform_suspend_ops *ops); |
26398a70 | 186 | extern int suspend_valid_only_mem(suspend_state_t state); |
95d9ffbe RW |
187 | |
188 | /** | |
189 | * arch_suspend_disable_irqs - disable IRQs for suspend | |
190 | * | |
191 | * Disables IRQs (in the default case). This is a weak symbol in the common | |
192 | * code and thus allows architectures to override it if more needs to be | |
193 | * done. Not called for suspend to disk. | |
194 | */ | |
195 | extern void arch_suspend_disable_irqs(void); | |
196 | ||
197 | /** | |
198 | * arch_suspend_enable_irqs - enable IRQs after suspend | |
199 | * | |
200 | * Enables IRQs (in the default case). This is a weak symbol in the common | |
201 | * code and thus allows architectures to override it if more needs to be | |
202 | * done. Not called for suspend to disk. | |
203 | */ | |
204 | extern void arch_suspend_enable_irqs(void); | |
205 | ||
206 | extern int pm_suspend(suspend_state_t state); | |
207 | #else /* !CONFIG_SUSPEND */ | |
208 | #define suspend_valid_only_mem NULL | |
209 | ||
2f55ac07 | 210 | static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {} |
95d9ffbe RW |
211 | static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; } |
212 | #endif /* !CONFIG_SUSPEND */ | |
1da177e4 | 213 | |
8357376d RW |
214 | /* struct pbe is used for creating lists of pages that should be restored |
215 | * atomically during the resume from disk, because the page frames they have | |
216 | * occupied before the suspend are in use. | |
217 | */ | |
dcbb5a54 | 218 | struct pbe { |
8357376d RW |
219 | void *address; /* address of the copy */ |
220 | void *orig_address; /* original address of a page */ | |
7088a5c0 | 221 | struct pbe *next; |
dcbb5a54 | 222 | }; |
1da177e4 | 223 | |
1da177e4 | 224 | /* mm/page_alloc.c */ |
1da177e4 LT |
225 | extern void mark_free_pages(struct zone *zone); |
226 | ||
a3d25c27 | 227 | /** |
b3dac3b3 | 228 | * struct platform_hibernation_ops - hibernation platform support |
a3d25c27 | 229 | * |
caea99ef RW |
230 | * The methods in this structure allow a platform to carry out special |
231 | * operations required by it during a hibernation transition. | |
a3d25c27 | 232 | * |
d8f3de0d | 233 | * All the methods below, except for @recover(), must be implemented. |
a3d25c27 | 234 | * |
caea99ef | 235 | * @begin: Tell the platform driver that we're starting hibernation. |
74f270af RW |
236 | * Called right after shrinking memory and before freezing devices. |
237 | * | |
caea99ef RW |
238 | * @end: Called by the PM core right after resuming devices, to indicate to |
239 | * the platform that the system has returned to the working state. | |
240 | * | |
74f270af RW |
241 | * @pre_snapshot: Prepare the platform for creating the hibernation image. |
242 | * Called right after devices have been frozen and before the nonboot | |
243 | * CPUs are disabled (runs with IRQs on). | |
244 | * | |
245 | * @finish: Restore the previous state of the platform after the hibernation | |
246 | * image has been created *or* put the platform into the normal operation | |
247 | * mode after the hibernation (the same method is executed in both cases). | |
248 | * Called right after the nonboot CPUs have been enabled and before | |
249 | * thawing devices (runs with IRQs on). | |
250 | * | |
251 | * @prepare: Prepare the platform for entering the low power state. | |
252 | * Called right after the hibernation image has been saved and before | |
253 | * devices are prepared for entering the low power state. | |
254 | * | |
255 | * @enter: Put the system into the low power state after the hibernation image | |
256 | * has been saved to disk. | |
257 | * Called after the nonboot CPUs have been disabled and all of the low | |
258 | * level devices have been shut down (runs with IRQs off). | |
259 | * | |
c7e0831d RW |
260 | * @leave: Perform the first stage of the cleanup after the system sleep state |
261 | * indicated by @set_target() has been left. | |
262 | * Called right after the control has been passed from the boot kernel to | |
263 | * the image kernel, before the nonboot CPUs are enabled and before devices | |
264 | * are resumed. Executed with interrupts disabled. | |
265 | * | |
74f270af RW |
266 | * @pre_restore: Prepare system for the restoration from a hibernation image. |
267 | * Called right after devices have been frozen and before the nonboot | |
268 | * CPUs are disabled (runs with IRQs on). | |
269 | * | |
270 | * @restore_cleanup: Clean up after a failing image restoration. | |
271 | * Called right after the nonboot CPUs have been enabled and before | |
272 | * thawing devices (runs with IRQs on). | |
d8f3de0d RW |
273 | * |
274 | * @recover: Recover the platform from a failure to suspend devices. | |
275 | * Called by the PM core if the suspending of devices during hibernation | |
276 | * fails. This callback is optional and should only be implemented by | |
277 | * platforms which require special recovery actions in that situation. | |
a3d25c27 | 278 | */ |
b3dac3b3 | 279 | struct platform_hibernation_ops { |
caea99ef RW |
280 | int (*begin)(void); |
281 | void (*end)(void); | |
74f270af RW |
282 | int (*pre_snapshot)(void); |
283 | void (*finish)(void); | |
a3d25c27 RW |
284 | int (*prepare)(void); |
285 | int (*enter)(void); | |
c7e0831d | 286 | void (*leave)(void); |
a634cc10 RW |
287 | int (*pre_restore)(void); |
288 | void (*restore_cleanup)(void); | |
d8f3de0d | 289 | void (*recover)(void); |
a3d25c27 RW |
290 | }; |
291 | ||
b0cb1a19 | 292 | #ifdef CONFIG_HIBERNATION |
74dfd666 | 293 | /* kernel/power/snapshot.c */ |
940d67f6 | 294 | extern void __register_nosave_region(unsigned long b, unsigned long e, int km); |
ce289e89 | 295 | static inline void __init register_nosave_region(unsigned long b, unsigned long e) |
940d67f6 JB |
296 | { |
297 | __register_nosave_region(b, e, 0); | |
298 | } | |
ce289e89 | 299 | static inline void __init register_nosave_region_late(unsigned long b, unsigned long e) |
940d67f6 JB |
300 | { |
301 | __register_nosave_region(b, e, 1); | |
302 | } | |
74dfd666 RW |
303 | extern int swsusp_page_is_forbidden(struct page *); |
304 | extern void swsusp_set_page_free(struct page *); | |
305 | extern void swsusp_unset_page_free(struct page *); | |
306 | extern unsigned long get_safe_page(gfp_t gfp_mask); | |
a3d25c27 | 307 | |
073ef1f6 | 308 | extern void hibernation_set_ops(const struct platform_hibernation_ops *ops); |
a3d25c27 | 309 | extern int hibernate(void); |
abfe2d7b | 310 | extern bool system_entering_hibernation(void); |
b0cb1a19 | 311 | #else /* CONFIG_HIBERNATION */ |
1f112cee RW |
312 | static inline void register_nosave_region(unsigned long b, unsigned long e) {} |
313 | static inline void register_nosave_region_late(unsigned long b, unsigned long e) {} | |
74dfd666 RW |
314 | static inline int swsusp_page_is_forbidden(struct page *p) { return 0; } |
315 | static inline void swsusp_set_page_free(struct page *p) {} | |
316 | static inline void swsusp_unset_page_free(struct page *p) {} | |
a3d25c27 | 317 | |
073ef1f6 | 318 | static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {} |
a3d25c27 | 319 | static inline int hibernate(void) { return -ENOSYS; } |
fce2b111 CH |
320 | static inline bool system_entering_hibernation(void) { return false; } |
321 | #endif /* CONFIG_HIBERNATION */ | |
322 | ||
35eb6db1 AW |
323 | /* Hibernation and suspend events */ |
324 | #define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */ | |
325 | #define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */ | |
326 | #define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */ | |
327 | #define PM_POST_SUSPEND 0x0004 /* Suspend finished */ | |
328 | #define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */ | |
329 | #define PM_POST_RESTORE 0x0006 /* Restore failed */ | |
330 | ||
296699de | 331 | #ifdef CONFIG_PM_SLEEP |
1da177e4 LT |
332 | void save_processor_state(void); |
333 | void restore_processor_state(void); | |
25761b6e | 334 | |
b10d9117 | 335 | /* kernel/power/main.c */ |
82525756 AS |
336 | extern int register_pm_notifier(struct notifier_block *nb); |
337 | extern int unregister_pm_notifier(struct notifier_block *nb); | |
b10d9117 RW |
338 | |
339 | #define pm_notifier(fn, pri) { \ | |
340 | static struct notifier_block fn##_nb = \ | |
341 | { .notifier_call = fn, .priority = pri }; \ | |
342 | register_pm_notifier(&fn##_nb); \ | |
343 | } | |
c125e96f RW |
344 | |
345 | /* drivers/base/power/wakeup.c */ | |
346 | extern bool events_check_enabled; | |
347 | ||
a2867e08 | 348 | extern bool pm_wakeup_pending(void); |
074037ec RW |
349 | extern bool pm_get_wakeup_count(unsigned int *count); |
350 | extern bool pm_save_wakeup_count(unsigned int count); | |
296699de | 351 | #else /* !CONFIG_PM_SLEEP */ |
b10d9117 RW |
352 | |
353 | static inline int register_pm_notifier(struct notifier_block *nb) | |
354 | { | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static inline int unregister_pm_notifier(struct notifier_block *nb) | |
359 | { | |
360 | return 0; | |
361 | } | |
362 | ||
363 | #define pm_notifier(fn, pri) do { (void)(fn); } while (0) | |
dbeeec5f | 364 | |
a2867e08 | 365 | static inline bool pm_wakeup_pending(void) { return false; } |
296699de | 366 | #endif /* !CONFIG_PM_SLEEP */ |
b10d9117 | 367 | |
6ad696d2 AK |
368 | extern struct mutex pm_mutex; |
369 | ||
1f112cee | 370 | #ifndef CONFIG_HIBERNATE_CALLBACKS |
6ad696d2 AK |
371 | static inline void lock_system_sleep(void) {} |
372 | static inline void unlock_system_sleep(void) {} | |
373 | ||
374 | #else | |
375 | ||
376 | /* Let some subsystems like memory hotadd exclude hibernation */ | |
377 | ||
378 | static inline void lock_system_sleep(void) | |
379 | { | |
380 | mutex_lock(&pm_mutex); | |
381 | } | |
382 | ||
383 | static inline void unlock_system_sleep(void) | |
384 | { | |
385 | mutex_unlock(&pm_mutex); | |
386 | } | |
387 | #endif | |
89081d17 | 388 | |
85055dd8 MS |
389 | #ifdef CONFIG_ARCH_SAVE_PAGE_KEYS |
390 | /* | |
391 | * The ARCH_SAVE_PAGE_KEYS functions can be used by an architecture | |
392 | * to save/restore additional information to/from the array of page | |
393 | * frame numbers in the hibernation image. For s390 this is used to | |
394 | * save and restore the storage key for each page that is included | |
395 | * in the hibernation image. | |
396 | */ | |
397 | unsigned long page_key_additional_pages(unsigned long pages); | |
398 | int page_key_alloc(unsigned long pages); | |
399 | void page_key_free(void); | |
400 | void page_key_read(unsigned long *pfn); | |
401 | void page_key_memorize(unsigned long *pfn); | |
402 | void page_key_write(void *address); | |
403 | ||
404 | #else /* !CONFIG_ARCH_SAVE_PAGE_KEYS */ | |
405 | ||
406 | static inline unsigned long page_key_additional_pages(unsigned long pages) | |
407 | { | |
408 | return 0; | |
409 | } | |
410 | ||
411 | static inline int page_key_alloc(unsigned long pages) | |
412 | { | |
413 | return 0; | |
414 | } | |
415 | ||
416 | static inline void page_key_free(void) {} | |
417 | static inline void page_key_read(unsigned long *pfn) {} | |
418 | static inline void page_key_memorize(unsigned long *pfn) {} | |
419 | static inline void page_key_write(void *address) {} | |
420 | ||
421 | #endif /* !CONFIG_ARCH_SAVE_PAGE_KEYS */ | |
422 | ||
95d9ffbe | 423 | #endif /* _LINUX_SUSPEND_H */ |