include/linux/suspend.h

   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  */
  17 struct 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 */
  24 extern void drain_local_pages(void);
  25 extern void mark_free_pages(struct zone *zone);
  26
  27 #if defined(CONFIG_PM) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
  28 extern int pm_prepare_console(void);
  29 extern void pm_restore_console(void);
  30 #else
  31 static inline int pm_prepare_console(void) { return 0; }
  32 static 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  */
  49 struct 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 */
  60 extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
  61 static inline void register_nosave_region(unsigned long b, unsigned long e)
  62 {
  63         __register_nosave_region(b, e, 0);
  64 }
  65 static inline void register_nosave_region_late(unsigned long b, unsigned long e)
  66 {
  67         __register_nosave_region(b, e, 1);
  68 }
  69 extern int swsusp_page_is_forbidden(struct page *);
  70 extern void swsusp_set_page_free(struct page *);
  71 extern void swsusp_unset_page_free(struct page *);
  72 extern unsigned long get_safe_page(gfp_t gfp_mask);
  73
  74 extern void hibernation_set_ops(struct hibernation_ops *ops);
  75 extern int hibernate(void);
  76 #else /* CONFIG_SOFTWARE_SUSPEND */
  77 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
  78 static inline void swsusp_set_page_free(struct page *p) {}
  79 static inline void swsusp_unset_page_free(struct page *p) {}
  80
  81 static inline void hibernation_set_ops(struct hibernation_ops *ops) {}
  82 static inline int hibernate(void) { return -ENOSYS; }
  83 #endif /* CONFIG_SOFTWARE_SUSPEND */
  84
  85 void save_processor_state(void);
  86 void restore_processor_state(void);
  87 struct saved_context;
  88 void __save_processor_state(struct saved_context *ctxt);
  89 void __restore_processor_state(struct saved_context *ctxt);
  90
  91 /* kernel/power/main.c */
  92 extern struct blocking_notifier_head pm_chain_head;
  93
  94 static inline int register_pm_notifier(struct notifier_block *nb)
  95 {
  96         return blocking_notifier_chain_register(&pm_chain_head, nb);
  97 }
  98
  99 static 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
 111 static inline int register_pm_notifier(struct notifier_block *nb)
 112 {
 113         return 0;
 114 }
 115
 116 static 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)
 125 static inline void register_nosave_region(unsigned long b, unsigned long e)
 126 {
 127 }
 128 #endif
 129
 130 #endif /* _LINUX_SWSUSP_H */