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1 | #ifndef _LINUX_SUSPEND_H |
2 | #define _LINUX_SUSPEND_H | |
1da177e4 | 3 | |
543b9fd3 | 4 | #if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || defined(CONFIG_PPC64) |
1da177e4 LT |
5 | #include <asm/suspend.h> |
6 | #endif | |
7 | #include <linux/swap.h> | |
8 | #include <linux/notifier.h> | |
1da177e4 LT |
9 | #include <linux/init.h> |
10 | #include <linux/pm.h> | |
7be98234 | 11 | #include <linux/mm.h> |
95d9ffbe RW |
12 | #include <asm/errno.h> |
13 | ||
14 | #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) | |
15 | extern int pm_prepare_console(void); | |
16 | extern void pm_restore_console(void); | |
17 | #else | |
18 | static inline int pm_prepare_console(void) { return 0; } | |
19 | static inline void pm_restore_console(void) {} | |
20 | #endif | |
21 | ||
22 | typedef int __bitwise suspend_state_t; | |
23 | ||
24 | #define PM_SUSPEND_ON ((__force suspend_state_t) 0) | |
25 | #define PM_SUSPEND_STANDBY ((__force suspend_state_t) 1) | |
26 | #define PM_SUSPEND_MEM ((__force suspend_state_t) 3) | |
27 | #define PM_SUSPEND_MAX ((__force suspend_state_t) 4) | |
28 | ||
29 | /** | |
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30 | * struct platform_suspend_ops - Callbacks for managing platform dependent |
31 | * system sleep states. | |
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32 | * |
33 | * @valid: Callback to determine if given system sleep state is supported by | |
34 | * the platform. | |
35 | * Valid (ie. supported) states are advertised in /sys/power/state. Note | |
36 | * that it still may be impossible to enter given system sleep state if the | |
37 | * conditions aren't right. | |
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38 | * There is the %suspend_valid_only_mem function available that can be |
39 | * assigned to this if the platform only supports mem sleep. | |
95d9ffbe | 40 | * |
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41 | * @begin: Initialise a transition to given system sleep state. |
42 | * @begin() is executed right prior to suspending devices. The information | |
43 | * conveyed to the platform code by @begin() should be disregarded by it as | |
44 | * soon as @end() is executed. If @begin() fails (ie. returns nonzero), | |
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45 | * @prepare(), @enter() and @finish() will not be called by the PM core. |
46 | * This callback is optional. However, if it is implemented, the argument | |
c697eece | 47 | * passed to @enter() is redundant and should be ignored. |
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48 | * |
49 | * @prepare: Prepare the platform for entering the system sleep state indicated | |
c697eece | 50 | * by @begin(). |
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51 | * @prepare() is called right after devices have been suspended (ie. the |
52 | * appropriate .suspend() method has been executed for each device) and | |
53 | * before the nonboot CPUs are disabled (it is executed with IRQs enabled). | |
54 | * This callback is optional. It returns 0 on success or a negative | |
55 | * error code otherwise, in which case the system cannot enter the desired | |
56 | * sleep state (@enter() and @finish() will not be called in that case). | |
57 | * | |
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58 | * @enter: Enter the system sleep state indicated by @begin() or represented by |
59 | * the argument if @begin() is not implemented. | |
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60 | * This callback is mandatory. It returns 0 on success or a negative |
61 | * error code otherwise, in which case the system cannot enter the desired | |
62 | * sleep state. | |
63 | * | |
64 | * @finish: Called when the system has just left a sleep state, right after | |
65 | * the nonboot CPUs have been enabled and before devices are resumed (it is | |
e6c5eb95 | 66 | * executed with IRQs enabled). |
95d9ffbe RW |
67 | * This callback is optional, but should be implemented by the platforms |
68 | * that implement @prepare(). If implemented, it is always called after | |
69 | * @enter() (even if @enter() fails). | |
c697eece RW |
70 | * |
71 | * @end: Called by the PM core right after resuming devices, to indicate to | |
72 | * the platform that the system has returned to the working state or | |
73 | * the transition to the sleep state has been aborted. | |
74 | * This callback is optional, but should be implemented by the platforms | |
75 | * that implement @begin(), but platforms implementing @begin() should | |
76 | * also provide a @end() which cleans up transitions aborted before | |
77 | * @enter(). | |
95d9ffbe | 78 | */ |
26398a70 | 79 | struct platform_suspend_ops { |
95d9ffbe | 80 | int (*valid)(suspend_state_t state); |
c697eece | 81 | int (*begin)(suspend_state_t state); |
e6c5eb95 | 82 | int (*prepare)(void); |
95d9ffbe | 83 | int (*enter)(suspend_state_t state); |
e6c5eb95 | 84 | void (*finish)(void); |
c697eece | 85 | void (*end)(void); |
95d9ffbe RW |
86 | }; |
87 | ||
88 | #ifdef CONFIG_SUSPEND | |
95d9ffbe | 89 | /** |
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90 | * suspend_set_ops - set platform dependent suspend operations |
91 | * @ops: The new suspend operations to set. | |
95d9ffbe | 92 | */ |
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93 | extern void suspend_set_ops(struct platform_suspend_ops *ops); |
94 | extern int suspend_valid_only_mem(suspend_state_t state); | |
95d9ffbe RW |
95 | |
96 | /** | |
97 | * arch_suspend_disable_irqs - disable IRQs for suspend | |
98 | * | |
99 | * Disables IRQs (in the default case). This is a weak symbol in the common | |
100 | * code and thus allows architectures to override it if more needs to be | |
101 | * done. Not called for suspend to disk. | |
102 | */ | |
103 | extern void arch_suspend_disable_irqs(void); | |
104 | ||
105 | /** | |
106 | * arch_suspend_enable_irqs - enable IRQs after suspend | |
107 | * | |
108 | * Enables IRQs (in the default case). This is a weak symbol in the common | |
109 | * code and thus allows architectures to override it if more needs to be | |
110 | * done. Not called for suspend to disk. | |
111 | */ | |
112 | extern void arch_suspend_enable_irqs(void); | |
113 | ||
114 | extern int pm_suspend(suspend_state_t state); | |
115 | #else /* !CONFIG_SUSPEND */ | |
116 | #define suspend_valid_only_mem NULL | |
117 | ||
26398a70 | 118 | static inline void suspend_set_ops(struct platform_suspend_ops *ops) {} |
95d9ffbe RW |
119 | static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; } |
120 | #endif /* !CONFIG_SUSPEND */ | |
1da177e4 | 121 | |
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122 | /* struct pbe is used for creating lists of pages that should be restored |
123 | * atomically during the resume from disk, because the page frames they have | |
124 | * occupied before the suspend are in use. | |
125 | */ | |
dcbb5a54 | 126 | struct pbe { |
8357376d RW |
127 | void *address; /* address of the copy */ |
128 | void *orig_address; /* original address of a page */ | |
7088a5c0 | 129 | struct pbe *next; |
dcbb5a54 | 130 | }; |
1da177e4 | 131 | |
1da177e4 LT |
132 | /* mm/page_alloc.c */ |
133 | extern void drain_local_pages(void); | |
134 | extern void mark_free_pages(struct zone *zone); | |
135 | ||
a3d25c27 | 136 | /** |
b3dac3b3 | 137 | * struct platform_hibernation_ops - hibernation platform support |
a3d25c27 RW |
138 | * |
139 | * The methods in this structure allow a platform to override the default | |
140 | * mechanism of shutting down the machine during a hibernation transition. | |
141 | * | |
142 | * All three methods must be assigned. | |
143 | * | |
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144 | * @start: Tell the platform driver that we're starting hibernation. |
145 | * Called right after shrinking memory and before freezing devices. | |
146 | * | |
147 | * @pre_snapshot: Prepare the platform for creating the hibernation image. | |
148 | * Called right after devices have been frozen and before the nonboot | |
149 | * CPUs are disabled (runs with IRQs on). | |
150 | * | |
151 | * @finish: Restore the previous state of the platform after the hibernation | |
152 | * image has been created *or* put the platform into the normal operation | |
153 | * mode after the hibernation (the same method is executed in both cases). | |
154 | * Called right after the nonboot CPUs have been enabled and before | |
155 | * thawing devices (runs with IRQs on). | |
156 | * | |
157 | * @prepare: Prepare the platform for entering the low power state. | |
158 | * Called right after the hibernation image has been saved and before | |
159 | * devices are prepared for entering the low power state. | |
160 | * | |
161 | * @enter: Put the system into the low power state after the hibernation image | |
162 | * has been saved to disk. | |
163 | * Called after the nonboot CPUs have been disabled and all of the low | |
164 | * level devices have been shut down (runs with IRQs off). | |
165 | * | |
c7e0831d RW |
166 | * @leave: Perform the first stage of the cleanup after the system sleep state |
167 | * indicated by @set_target() has been left. | |
168 | * Called right after the control has been passed from the boot kernel to | |
169 | * the image kernel, before the nonboot CPUs are enabled and before devices | |
170 | * are resumed. Executed with interrupts disabled. | |
171 | * | |
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172 | * @pre_restore: Prepare system for the restoration from a hibernation image. |
173 | * Called right after devices have been frozen and before the nonboot | |
174 | * CPUs are disabled (runs with IRQs on). | |
175 | * | |
176 | * @restore_cleanup: Clean up after a failing image restoration. | |
177 | * Called right after the nonboot CPUs have been enabled and before | |
178 | * thawing devices (runs with IRQs on). | |
a3d25c27 | 179 | */ |
b3dac3b3 | 180 | struct platform_hibernation_ops { |
74f270af RW |
181 | int (*start)(void); |
182 | int (*pre_snapshot)(void); | |
183 | void (*finish)(void); | |
a3d25c27 RW |
184 | int (*prepare)(void); |
185 | int (*enter)(void); | |
c7e0831d | 186 | void (*leave)(void); |
a634cc10 RW |
187 | int (*pre_restore)(void); |
188 | void (*restore_cleanup)(void); | |
a3d25c27 RW |
189 | }; |
190 | ||
b0cb1a19 | 191 | #ifdef CONFIG_HIBERNATION |
74dfd666 | 192 | /* kernel/power/snapshot.c */ |
940d67f6 JB |
193 | extern void __register_nosave_region(unsigned long b, unsigned long e, int km); |
194 | static inline void register_nosave_region(unsigned long b, unsigned long e) | |
195 | { | |
196 | __register_nosave_region(b, e, 0); | |
197 | } | |
198 | static inline void register_nosave_region_late(unsigned long b, unsigned long e) | |
199 | { | |
200 | __register_nosave_region(b, e, 1); | |
201 | } | |
74dfd666 RW |
202 | extern int swsusp_page_is_forbidden(struct page *); |
203 | extern void swsusp_set_page_free(struct page *); | |
204 | extern void swsusp_unset_page_free(struct page *); | |
205 | extern unsigned long get_safe_page(gfp_t gfp_mask); | |
a3d25c27 | 206 | |
b3dac3b3 | 207 | extern void hibernation_set_ops(struct platform_hibernation_ops *ops); |
a3d25c27 | 208 | extern int hibernate(void); |
b0cb1a19 | 209 | #else /* CONFIG_HIBERNATION */ |
74dfd666 RW |
210 | static inline int swsusp_page_is_forbidden(struct page *p) { return 0; } |
211 | static inline void swsusp_set_page_free(struct page *p) {} | |
212 | static inline void swsusp_unset_page_free(struct page *p) {} | |
a3d25c27 | 213 | |
b3dac3b3 | 214 | static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {} |
a3d25c27 | 215 | static inline int hibernate(void) { return -ENOSYS; } |
b0cb1a19 | 216 | #endif /* CONFIG_HIBERNATION */ |
1da177e4 | 217 | |
296699de | 218 | #ifdef CONFIG_PM_SLEEP |
1da177e4 LT |
219 | void save_processor_state(void); |
220 | void restore_processor_state(void); | |
25761b6e | 221 | |
b10d9117 | 222 | /* kernel/power/main.c */ |
82525756 AS |
223 | extern int register_pm_notifier(struct notifier_block *nb); |
224 | extern int unregister_pm_notifier(struct notifier_block *nb); | |
b10d9117 RW |
225 | |
226 | #define pm_notifier(fn, pri) { \ | |
227 | static struct notifier_block fn##_nb = \ | |
228 | { .notifier_call = fn, .priority = pri }; \ | |
229 | register_pm_notifier(&fn##_nb); \ | |
230 | } | |
296699de | 231 | #else /* !CONFIG_PM_SLEEP */ |
b10d9117 RW |
232 | |
233 | static inline int register_pm_notifier(struct notifier_block *nb) | |
234 | { | |
235 | return 0; | |
236 | } | |
237 | ||
238 | static inline int unregister_pm_notifier(struct notifier_block *nb) | |
239 | { | |
240 | return 0; | |
241 | } | |
242 | ||
243 | #define pm_notifier(fn, pri) do { (void)(fn); } while (0) | |
296699de | 244 | #endif /* !CONFIG_PM_SLEEP */ |
b10d9117 | 245 | |
296699de | 246 | #ifndef CONFIG_HIBERNATION |
b10d9117 RW |
247 | static inline void register_nosave_region(unsigned long b, unsigned long e) |
248 | { | |
249 | } | |
70f38db6 RK |
250 | static inline void register_nosave_region_late(unsigned long b, unsigned long e) |
251 | { | |
252 | } | |
b10d9117 RW |
253 | #endif |
254 | ||
95d9ffbe | 255 | #endif /* _LINUX_SUSPEND_H */ |