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-rw-r--r--kernel/power/power.h75
1 files changed, 67 insertions, 8 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 388dba680841..f06f12f21767 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -8,6 +8,7 @@ struct swsusp_info {
8 int cpus; 8 int cpus;
9 unsigned long image_pages; 9 unsigned long image_pages;
10 unsigned long pages; 10 unsigned long pages;
11 unsigned long size;
11} __attribute__((aligned(PAGE_SIZE))); 12} __attribute__((aligned(PAGE_SIZE)));
12 13
13 14
@@ -37,21 +38,79 @@ extern struct subsystem power_subsys;
37/* References to section boundaries */ 38/* References to section boundaries */
38extern const void __nosave_begin, __nosave_end; 39extern const void __nosave_begin, __nosave_end;
39 40
40extern unsigned int nr_copy_pages;
41extern struct pbe *pagedir_nosave; 41extern struct pbe *pagedir_nosave;
42 42
43/* Preferred image size in bytes (default 500 MB) */ 43/* Preferred image size in bytes (default 500 MB) */
44extern unsigned long image_size; 44extern unsigned long image_size;
45extern int in_suspend;
46extern dev_t swsusp_resume_device;
45 47
46extern asmlinkage int swsusp_arch_suspend(void); 48extern asmlinkage int swsusp_arch_suspend(void);
47extern asmlinkage int swsusp_arch_resume(void); 49extern asmlinkage int swsusp_arch_resume(void);
48 50
49extern unsigned int count_data_pages(void); 51extern unsigned int count_data_pages(void);
50extern void free_pagedir(struct pbe *pblist); 52
51extern void release_eaten_pages(void); 53struct snapshot_handle {
52extern struct pbe *alloc_pagedir(unsigned nr_pages, gfp_t gfp_mask, int safe_needed); 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
65extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
66extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
67int 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
98struct bitmap_page {
99 unsigned long chunks[BITMAP_PAGE_CHUNKS];
100 struct bitmap_page *next;
101};
102
103extern void free_bitmap(struct bitmap_page *bitmap);
104extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
105extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
106extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
107
108extern int swsusp_check(void);
109extern int swsusp_shrink_memory(void);
53extern void swsusp_free(void); 110extern void swsusp_free(void);
54extern int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed); 111extern int swsusp_suspend(void);
55extern unsigned int snapshot_nr_pages(void); 112extern int swsusp_resume(void);
56extern struct pbe *snapshot_pblist(void); 113extern int swsusp_read(void);
57extern void snapshot_pblist_set(struct pbe *pblist); 114extern int swsusp_write(void);
115extern void swsusp_close(void);
116extern int suspend_enter(suspend_state_t state);
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