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 } __attribute__((aligned(PAGE_SIZE)));
  12
  13
  14
  15 #ifdef CONFIG_SOFTWARE_SUSPEND
  16 extern int pm_suspend_disk(void);
  17
  18 #else
  19 static inline int pm_suspend_disk(void)
  20 {
  21         return -EPERM;
  22 }
  23 #endif
  24 extern struct semaphore pm_sem;
  25 #define power_attr(_name) \
  26 static struct subsys_attribute _name##_attr = { \
  27         .attr   = {                             \
  28                 .name = __stringify(_name),     \
  29                 .mode = 0644,                   \
  30         },                                      \
  31         .show   = _name##_show,                 \
  32         .store  = _name##_store,                \
  33 }
  34
  35 extern struct subsystem power_subsys;
  36
  37 /* References to section boundaries */
  38 extern const void __nosave_begin, __nosave_end;
  39
  40 extern struct pbe *pagedir_nosave;
  41
  42 /* Preferred image size in bytes (default 500 MB) */
  43 extern unsigned long image_size;
  44 extern int in_suspend;
  45 extern dev_t swsusp_resume_device;
  46
  47 extern asmlinkage int swsusp_arch_suspend(void);
  48 extern asmlinkage int swsusp_arch_resume(void);
  49
  50 extern unsigned int count_data_pages(void);
  51 extern void swsusp_free(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 /**
  70  *      The bitmap is used for tracing allocated swap pages
  71  *
  72  *      The entire bitmap consists of a number of bitmap_page
  73  *      structures linked with the help of the .next member.
  74  *      Thus each page can be allocated individually, so we only
  75  *      need to make 0-order memory allocations to create
  76  *      the bitmap.
  77  */
  78
  79 #define BITMAP_PAGE_SIZE        (PAGE_SIZE - sizeof(void *))
  80 #define BITMAP_PAGE_CHUNKS      (BITMAP_PAGE_SIZE / sizeof(long))
  81 #define BITS_PER_CHUNK          (sizeof(long) * 8)
  82 #define BITMAP_PAGE_BITS        (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
  83
  84 struct bitmap_page {
  85         unsigned long           chunks[BITMAP_PAGE_CHUNKS];
  86         struct bitmap_page      *next;
  87 };
  88
  89 extern void free_bitmap(struct bitmap_page *bitmap);
  90 extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
  91 extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
  92 extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
  93
  94 extern int swsusp_shrink_memory(void);
  95 extern int swsusp_suspend(void);
  96 extern int swsusp_resume(void);