tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _LINUX_SWSUSP_H
2#define _LINUX_SWSUSP_H
3
4#if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || defined(CONFIG_PPC64)
5#include <asm/suspend.h>
6#endif
7#include <linux/swap.h>
8#include <linux/notifier.h>
9#include <linux/init.h>
10#include <linux/pm.h>
11#include <linux/mm.h>
12
13/* struct pbe is used for creating lists of pages that should be restored
14 * atomically during the resume from disk, because the page frames they have
15 * occupied before the suspend are in use.
16 */
17struct pbe {
18 void *address; /* address of the copy */
19 void *orig_address; /* original address of a page */
20 struct pbe *next;
21};
22
23/* mm/page_alloc.c */
24extern void drain_local_pages(void);
25extern void mark_free_pages(struct zone *zone);
26
27#if defined(CONFIG_PM) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
28extern int pm_prepare_console(void);
29extern void pm_restore_console(void);
30#else
31static inline int pm_prepare_console(void) { return 0; }
32static inline void pm_restore_console(void) {}
33#endif
34
35/**
36 * struct hibernation_ops - hibernation platform support
37 *
38 * The methods in this structure allow a platform to override the default
39 * mechanism of shutting down the machine during a hibernation transition.
40 *
41 * All three methods must be assigned.
42 *
43 * @prepare: prepare system for hibernation
44 * @enter: shut down system after state has been saved to disk
45 * @finish: finish/clean up after state has been reloaded
46 * @pre_restore: prepare system for the restoration from a hibernation image
47 * @restore_cleanup: clean up after a failing image restoration
48 */
49struct hibernation_ops {
50 int (*prepare)(void);
51 int (*enter)(void);
52 void (*finish)(void);
53 int (*pre_restore)(void);
54 void (*restore_cleanup)(void);
55};
56
57#ifdef CONFIG_PM
58#ifdef CONFIG_SOFTWARE_SUSPEND
59/* kernel/power/snapshot.c */
60extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
61static inline void register_nosave_region(unsigned long b, unsigned long e)
62{
63 __register_nosave_region(b, e, 0);
64}
65static inline void register_nosave_region_late(unsigned long b, unsigned long e)
66{
67 __register_nosave_region(b, e, 1);
68}
69extern int swsusp_page_is_forbidden(struct page *);
70extern void swsusp_set_page_free(struct page *);
71extern void swsusp_unset_page_free(struct page *);
72extern unsigned long get_safe_page(gfp_t gfp_mask);
73
74extern void hibernation_set_ops(struct hibernation_ops *ops);
75extern int hibernate(void);
76#else /* CONFIG_SOFTWARE_SUSPEND */
77static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
78static inline void swsusp_set_page_free(struct page *p) {}
79static inline void swsusp_unset_page_free(struct page *p) {}
80
81static inline void hibernation_set_ops(struct hibernation_ops *ops) {}
82static inline int hibernate(void) { return -ENOSYS; }
83#endif /* CONFIG_SOFTWARE_SUSPEND */
84
85void save_processor_state(void);
86void restore_processor_state(void);
87struct saved_context;
88void __save_processor_state(struct saved_context *ctxt);
89void __restore_processor_state(struct saved_context *ctxt);
90
91/* kernel/power/main.c */
92extern struct blocking_notifier_head pm_chain_head;
93
94static inline int register_pm_notifier(struct notifier_block *nb)
95{
96 return blocking_notifier_chain_register(&pm_chain_head, nb);
97}
98
99static inline int unregister_pm_notifier(struct notifier_block *nb)
100{
101 return blocking_notifier_chain_unregister(&pm_chain_head, nb);
102}
103
104#define pm_notifier(fn, pri) { \
105 static struct notifier_block fn##_nb = \
106 { .notifier_call = fn, .priority = pri }; \
107 register_pm_notifier(&fn##_nb); \
108}
109#else /* CONFIG_PM */
110
111static inline int register_pm_notifier(struct notifier_block *nb)
112{
113 return 0;
114}
115
116static inline int unregister_pm_notifier(struct notifier_block *nb)
117{
118 return 0;
119}
120
121#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
122#endif /* CONFIG_PM */
123
124#if !defined CONFIG_SOFTWARE_SUSPEND || !defined(CONFIG_PM)
125static inline void register_nosave_region(unsigned long b, unsigned long e)
126{
127}
128#endif
129
130#endif /* _LINUX_SWSUSP_H */