kernel/power/power.h

   1 #include <linux/suspend.h>
   2 #include <linux/utsname.h>
   3
   4 struct swsusp_info {
   5         struct new_utsname      uts;
   6         u32                     version_code;
   7         unsigned long           num_physpages;
   8         int                     cpus;
   9         unsigned long           image_pages;
  10         unsigned long           pages;
  11         unsigned long           size;
  12 } __attribute__((aligned(PAGE_SIZE)));
  13
  14
  15
  16 #ifdef CONFIG_SOFTWARE_SUSPEND
  17 extern int pm_suspend_disk(void);
  18
  19 #else
  20 static inline int pm_suspend_disk(void)
  21 {
  22         return -EPERM;
  23 }
  24 #endif
  25 extern struct semaphore pm_sem;
  26 #define power_attr(_name) \
  27 static struct subsys_attribute _name##_attr = { \
  28         .attr   = {                             \
  29                 .name = __stringify(_name),     \
  30                 .mode = 0644,                   \
  31         },                                      \
  32         .show   = _name##_show,                 \
  33         .store  = _name##_store,                \
  34 }
  35
  36 extern struct subsystem power_subsys;
  37
  38 /* References to section boundaries */
  39 extern const void __nosave_begin, __nosave_end;
  40
  41 extern struct pbe *pagedir_nosave;
  42
  43 /* Preferred image size in bytes (default 500 MB) */
  44 extern unsigned long image_size;
  45 extern int in_suspend;
  46 extern dev_t swsusp_resume_device;
  47
  48 extern asmlinkage int swsusp_arch_suspend(void);
  49 extern asmlinkage int swsusp_arch_resume(void);
  50
  51 extern unsigned int count_data_pages(void);
  52
  53 struct snapshot_handle {
  54         loff_t          offset;
  55         unsigned int    page;
  56         unsigned int    page_offset;
  57         unsigned int    prev;
  58         struct pbe      *pbe;
  59         void            *buffer;
  60         unsigned int    buf_offset;
  61 };
  62
  63 #define data_of(handle) ((handle).buffer + (handle).buf_offset)
  64
  65 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
  66 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
  67 int snapshot_image_loaded(struct snapshot_handle *handle);
  68
  69 #define SNAPSHOT_IOC_MAGIC      '3'
  70 #define SNAPSHOT_FREEZE                 _IO(SNAPSHOT_IOC_MAGIC, 1)
  71 #define SNAPSHOT_UNFREEZE               _IO(SNAPSHOT_IOC_MAGIC, 2)
  72 #define SNAPSHOT_ATOMIC_SNAPSHOT        _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
  73 #define SNAPSHOT_ATOMIC_RESTORE         _IO(SNAPSHOT_IOC_MAGIC, 4)
  74 #define SNAPSHOT_FREE                   _IO(SNAPSHOT_IOC_MAGIC, 5)
  75 #define SNAPSHOT_SET_IMAGE_SIZE         _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
  76 #define SNAPSHOT_AVAIL_SWAP             _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
  77 #define SNAPSHOT_GET_SWAP_PAGE          _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
  78 #define SNAPSHOT_FREE_SWAP_PAGES        _IO(SNAPSHOT_IOC_MAGIC, 9)
  79 #define SNAPSHOT_SET_SWAP_FILE          _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
  80 #define SNAPSHOT_S2RAM                  _IO(SNAPSHOT_IOC_MAGIC, 11)
  81 #define SNAPSHOT_IOC_MAXNR      11
  82
  83 /**
  84  *      The bitmap is used for tracing allocated swap pages
  85  *
  86  *      The entire bitmap consists of a number of bitmap_page
  87  *      structures linked with the help of the .next member.
  88  *      Thus each page can be allocated individually, so we only
  89  *      need to make 0-order memory allocations to create
  90  *      the bitmap.
  91  */
  92
  93 #define BITMAP_PAGE_SIZE        (PAGE_SIZE - sizeof(void *))
  94 #define BITMAP_PAGE_CHUNKS      (BITMAP_PAGE_SIZE / sizeof(long))
  95 #define BITS_PER_CHUNK          (sizeof(long) * 8)
  96 #define BITMAP_PAGE_BITS        (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
  97
  98 struct bitmap_page {
  99         unsigned long           chunks[BITMAP_PAGE_CHUNKS];
 100         struct bitmap_page      *next;
 101 };
 102
 103 extern void free_bitmap(struct bitmap_page *bitmap);
 104 extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
 105 extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
 106 extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
 107
 108 extern unsigned int count_special_pages(void);
 109 extern int save_special_mem(void);
 110 extern int restore_special_mem(void);
 111
 112 extern int swsusp_check(void);
 113 extern int swsusp_shrink_memory(void);
 114 extern void swsusp_free(void);
 115 extern int swsusp_suspend(void);
 116 extern int swsusp_resume(void);
 117 extern int swsusp_read(void);
 118 extern int swsusp_write(void);
 119 extern void swsusp_close(void);
 120 extern int suspend_enter(suspend_state_t state);