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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 | ||
37 | /** | |
26398a70 RW |
38 | * struct platform_suspend_ops - Callbacks for managing platform dependent |
39 | * system sleep states. | |
95d9ffbe RW |
40 | * |
41 | * @valid: Callback to determine if given system sleep state is supported by | |
42 | * the platform. | |
43 | * Valid (ie. supported) states are advertised in /sys/power/state. Note | |
44 | * that it still may be impossible to enter given system sleep state if the | |
45 | * conditions aren't right. | |
26398a70 RW |
46 | * There is the %suspend_valid_only_mem function available that can be |
47 | * assigned to this if the platform only supports mem sleep. | |
95d9ffbe | 48 | * |
c697eece RW |
49 | * @begin: Initialise a transition to given system sleep state. |
50 | * @begin() is executed right prior to suspending devices. The information | |
51 | * conveyed to the platform code by @begin() should be disregarded by it as | |
52 | * soon as @end() is executed. If @begin() fails (ie. returns nonzero), | |
95d9ffbe RW |
53 | * @prepare(), @enter() and @finish() will not be called by the PM core. |
54 | * This callback is optional. However, if it is implemented, the argument | |
c697eece | 55 | * passed to @enter() is redundant and should be ignored. |
95d9ffbe RW |
56 | * |
57 | * @prepare: Prepare the platform for entering the system sleep state indicated | |
c697eece | 58 | * by @begin(). |
95d9ffbe RW |
59 | * @prepare() is called right after devices have been suspended (ie. the |
60 | * appropriate .suspend() method has been executed for each device) and | |
61 | * before the nonboot CPUs are disabled (it is executed with IRQs enabled). | |
62 | * This callback is optional. It returns 0 on success or a negative | |
63 | * error code otherwise, in which case the system cannot enter the desired | |
64 | * sleep state (@enter() and @finish() will not be called in that case). | |
65 | * | |
c697eece RW |
66 | * @enter: Enter the system sleep state indicated by @begin() or represented by |
67 | * the argument if @begin() is not implemented. | |
95d9ffbe RW |
68 | * This callback is mandatory. It returns 0 on success or a negative |
69 | * error code otherwise, in which case the system cannot enter the desired | |
70 | * sleep state. | |
71 | * | |
72 | * @finish: Called when the system has just left a sleep state, right after | |
73 | * the nonboot CPUs have been enabled and before devices are resumed (it is | |
e6c5eb95 | 74 | * executed with IRQs enabled). |
95d9ffbe RW |
75 | * This callback is optional, but should be implemented by the platforms |
76 | * that implement @prepare(). If implemented, it is always called after | |
77 | * @enter() (even if @enter() fails). | |
c697eece RW |
78 | * |
79 | * @end: Called by the PM core right after resuming devices, to indicate to | |
80 | * the platform that the system has returned to the working state or | |
81 | * the transition to the sleep state has been aborted. | |
82 | * This callback is optional, but should be implemented by the platforms | |
83 | * that implement @begin(), but platforms implementing @begin() should | |
84 | * also provide a @end() which cleans up transitions aborted before | |
85 | * @enter(). | |
d8f3de0d RW |
86 | * |
87 | * @recover: Recover the platform from a suspend failure. | |
88 | * Called by the PM core if the suspending of devices fails. | |
89 | * This callback is optional and should only be implemented by platforms | |
90 | * which require special recovery actions in that situation. | |
95d9ffbe | 91 | */ |
26398a70 | 92 | struct platform_suspend_ops { |
95d9ffbe | 93 | int (*valid)(suspend_state_t state); |
c697eece | 94 | int (*begin)(suspend_state_t state); |
e6c5eb95 | 95 | int (*prepare)(void); |
95d9ffbe | 96 | int (*enter)(suspend_state_t state); |
e6c5eb95 | 97 | void (*finish)(void); |
c697eece | 98 | void (*end)(void); |
d8f3de0d | 99 | void (*recover)(void); |
95d9ffbe RW |
100 | }; |
101 | ||
102 | #ifdef CONFIG_SUSPEND | |
95d9ffbe | 103 | /** |
26398a70 RW |
104 | * suspend_set_ops - set platform dependent suspend operations |
105 | * @ops: The new suspend operations to set. | |
95d9ffbe | 106 | */ |
26398a70 RW |
107 | extern void suspend_set_ops(struct platform_suspend_ops *ops); |
108 | extern int suspend_valid_only_mem(suspend_state_t state); | |
95d9ffbe RW |
109 | |
110 | /** | |
111 | * arch_suspend_disable_irqs - disable IRQs for suspend | |
112 | * | |
113 | * Disables IRQs (in the default case). This is a weak symbol in the common | |
114 | * code and thus allows architectures to override it if more needs to be | |
115 | * done. Not called for suspend to disk. | |
116 | */ | |
117 | extern void arch_suspend_disable_irqs(void); | |
118 | ||
119 | /** | |
120 | * arch_suspend_enable_irqs - enable IRQs after suspend | |
121 | * | |
122 | * Enables IRQs (in the default case). This is a weak symbol in the common | |
123 | * code and thus allows architectures to override it if more needs to be | |
124 | * done. Not called for suspend to disk. | |
125 | */ | |
126 | extern void arch_suspend_enable_irqs(void); | |
127 | ||
128 | extern int pm_suspend(suspend_state_t state); | |
129 | #else /* !CONFIG_SUSPEND */ | |
130 | #define suspend_valid_only_mem NULL | |
131 | ||
26398a70 | 132 | static inline void suspend_set_ops(struct platform_suspend_ops *ops) {} |
95d9ffbe RW |
133 | static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; } |
134 | #endif /* !CONFIG_SUSPEND */ | |
1da177e4 | 135 | |
8357376d RW |
136 | /* struct pbe is used for creating lists of pages that should be restored |
137 | * atomically during the resume from disk, because the page frames they have | |
138 | * occupied before the suspend are in use. | |
139 | */ | |
dcbb5a54 | 140 | struct pbe { |
8357376d RW |
141 | void *address; /* address of the copy */ |
142 | void *orig_address; /* original address of a page */ | |
7088a5c0 | 143 | struct pbe *next; |
dcbb5a54 | 144 | }; |
1da177e4 | 145 | |
1da177e4 | 146 | /* mm/page_alloc.c */ |
1da177e4 LT |
147 | extern void mark_free_pages(struct zone *zone); |
148 | ||
a3d25c27 | 149 | /** |
b3dac3b3 | 150 | * struct platform_hibernation_ops - hibernation platform support |
a3d25c27 | 151 | * |
caea99ef RW |
152 | * The methods in this structure allow a platform to carry out special |
153 | * operations required by it during a hibernation transition. | |
a3d25c27 | 154 | * |
d8f3de0d | 155 | * All the methods below, except for @recover(), must be implemented. |
a3d25c27 | 156 | * |
caea99ef | 157 | * @begin: Tell the platform driver that we're starting hibernation. |
74f270af RW |
158 | * Called right after shrinking memory and before freezing devices. |
159 | * | |
caea99ef RW |
160 | * @end: Called by the PM core right after resuming devices, to indicate to |
161 | * the platform that the system has returned to the working state. | |
162 | * | |
74f270af RW |
163 | * @pre_snapshot: Prepare the platform for creating the hibernation image. |
164 | * Called right after devices have been frozen and before the nonboot | |
165 | * CPUs are disabled (runs with IRQs on). | |
166 | * | |
167 | * @finish: Restore the previous state of the platform after the hibernation | |
168 | * image has been created *or* put the platform into the normal operation | |
169 | * mode after the hibernation (the same method is executed in both cases). | |
170 | * Called right after the nonboot CPUs have been enabled and before | |
171 | * thawing devices (runs with IRQs on). | |
172 | * | |
173 | * @prepare: Prepare the platform for entering the low power state. | |
174 | * Called right after the hibernation image has been saved and before | |
175 | * devices are prepared for entering the low power state. | |
176 | * | |
177 | * @enter: Put the system into the low power state after the hibernation image | |
178 | * has been saved to disk. | |
179 | * Called after the nonboot CPUs have been disabled and all of the low | |
180 | * level devices have been shut down (runs with IRQs off). | |
181 | * | |
c7e0831d RW |
182 | * @leave: Perform the first stage of the cleanup after the system sleep state |
183 | * indicated by @set_target() has been left. | |
184 | * Called right after the control has been passed from the boot kernel to | |
185 | * the image kernel, before the nonboot CPUs are enabled and before devices | |
186 | * are resumed. Executed with interrupts disabled. | |
187 | * | |
74f270af RW |
188 | * @pre_restore: Prepare system for the restoration from a hibernation image. |
189 | * Called right after devices have been frozen and before the nonboot | |
190 | * CPUs are disabled (runs with IRQs on). | |
191 | * | |
192 | * @restore_cleanup: Clean up after a failing image restoration. | |
193 | * Called right after the nonboot CPUs have been enabled and before | |
194 | * thawing devices (runs with IRQs on). | |
d8f3de0d RW |
195 | * |
196 | * @recover: Recover the platform from a failure to suspend devices. | |
197 | * Called by the PM core if the suspending of devices during hibernation | |
198 | * fails. This callback is optional and should only be implemented by | |
199 | * platforms which require special recovery actions in that situation. | |
a3d25c27 | 200 | */ |
b3dac3b3 | 201 | struct platform_hibernation_ops { |
caea99ef RW |
202 | int (*begin)(void); |
203 | void (*end)(void); | |
74f270af RW |
204 | int (*pre_snapshot)(void); |
205 | void (*finish)(void); | |
a3d25c27 RW |
206 | int (*prepare)(void); |
207 | int (*enter)(void); | |
c7e0831d | 208 | void (*leave)(void); |
a634cc10 RW |
209 | int (*pre_restore)(void); |
210 | void (*restore_cleanup)(void); | |
d8f3de0d | 211 | void (*recover)(void); |
a3d25c27 RW |
212 | }; |
213 | ||
b0cb1a19 | 214 | #ifdef CONFIG_HIBERNATION |
74dfd666 | 215 | /* kernel/power/snapshot.c */ |
940d67f6 | 216 | extern void __register_nosave_region(unsigned long b, unsigned long e, int km); |
ce289e89 | 217 | static inline void __init register_nosave_region(unsigned long b, unsigned long e) |
940d67f6 JB |
218 | { |
219 | __register_nosave_region(b, e, 0); | |
220 | } | |
ce289e89 | 221 | static inline void __init register_nosave_region_late(unsigned long b, unsigned long e) |
940d67f6 JB |
222 | { |
223 | __register_nosave_region(b, e, 1); | |
224 | } | |
74dfd666 RW |
225 | extern int swsusp_page_is_forbidden(struct page *); |
226 | extern void swsusp_set_page_free(struct page *); | |
227 | extern void swsusp_unset_page_free(struct page *); | |
228 | extern unsigned long get_safe_page(gfp_t gfp_mask); | |
a3d25c27 | 229 | |
b3dac3b3 | 230 | extern void hibernation_set_ops(struct platform_hibernation_ops *ops); |
a3d25c27 | 231 | extern int hibernate(void); |
3f4b0ef7 RW |
232 | extern int hibernate_nvs_register(unsigned long start, unsigned long size); |
233 | extern int hibernate_nvs_alloc(void); | |
234 | extern void hibernate_nvs_free(void); | |
235 | extern void hibernate_nvs_save(void); | |
236 | extern void hibernate_nvs_restore(void); | |
abfe2d7b | 237 | extern bool system_entering_hibernation(void); |
b0cb1a19 | 238 | #else /* CONFIG_HIBERNATION */ |
74dfd666 RW |
239 | static inline int swsusp_page_is_forbidden(struct page *p) { return 0; } |
240 | static inline void swsusp_set_page_free(struct page *p) {} | |
241 | static inline void swsusp_unset_page_free(struct page *p) {} | |
a3d25c27 | 242 | |
b3dac3b3 | 243 | static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {} |
a3d25c27 | 244 | static inline int hibernate(void) { return -ENOSYS; } |
3f4b0ef7 RW |
245 | static inline int hibernate_nvs_register(unsigned long a, unsigned long b) |
246 | { | |
247 | return 0; | |
248 | } | |
249 | static inline int hibernate_nvs_alloc(void) { return 0; } | |
250 | static inline void hibernate_nvs_free(void) {} | |
251 | static inline void hibernate_nvs_save(void) {} | |
252 | static inline void hibernate_nvs_restore(void) {} | |
abfe2d7b | 253 | static inline bool system_entering_hibernation(void) { return false; } |
b0cb1a19 | 254 | #endif /* CONFIG_HIBERNATION */ |
1da177e4 | 255 | |
296699de | 256 | #ifdef CONFIG_PM_SLEEP |
1da177e4 LT |
257 | void save_processor_state(void); |
258 | void restore_processor_state(void); | |
25761b6e | 259 | |
b10d9117 | 260 | /* kernel/power/main.c */ |
82525756 AS |
261 | extern int register_pm_notifier(struct notifier_block *nb); |
262 | extern int unregister_pm_notifier(struct notifier_block *nb); | |
b10d9117 RW |
263 | |
264 | #define pm_notifier(fn, pri) { \ | |
265 | static struct notifier_block fn##_nb = \ | |
266 | { .notifier_call = fn, .priority = pri }; \ | |
267 | register_pm_notifier(&fn##_nb); \ | |
268 | } | |
296699de | 269 | #else /* !CONFIG_PM_SLEEP */ |
b10d9117 RW |
270 | |
271 | static inline int register_pm_notifier(struct notifier_block *nb) | |
272 | { | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static inline int unregister_pm_notifier(struct notifier_block *nb) | |
277 | { | |
278 | return 0; | |
279 | } | |
280 | ||
281 | #define pm_notifier(fn, pri) do { (void)(fn); } while (0) | |
296699de | 282 | #endif /* !CONFIG_PM_SLEEP */ |
b10d9117 | 283 | |
296699de | 284 | #ifndef CONFIG_HIBERNATION |
b10d9117 RW |
285 | static inline void register_nosave_region(unsigned long b, unsigned long e) |
286 | { | |
287 | } | |
70f38db6 RK |
288 | static inline void register_nosave_region_late(unsigned long b, unsigned long e) |
289 | { | |
290 | } | |
b10d9117 RW |
291 | #endif |
292 | ||
89081d17 HY |
293 | extern struct mutex pm_mutex; |
294 | ||
95d9ffbe | 295 | #endif /* _LINUX_SUSPEND_H */ |