1 #include <linux/suspend.h>
2 #include <linux/utsname.h>
5 struct new_utsname uts;
7 unsigned long num_physpages;
9 unsigned long image_pages;
12 } __attribute__((aligned(PAGE_SIZE)));
16 #ifdef CONFIG_SOFTWARE_SUSPEND
17 extern int pm_suspend_disk(void);
20 static inline int pm_suspend_disk(void)
25 extern struct semaphore pm_sem;
26 #define power_attr(_name) \
27 static struct subsys_attribute _name##_attr = { \
29 .name = __stringify(_name), \
32 .show = _name##_show, \
33 .store = _name##_store, \
36 extern struct subsystem power_subsys;
38 /* References to section boundaries */
39 extern const void __nosave_begin, __nosave_end;
41 /* Preferred image size in bytes (default 500 MB) */
42 extern unsigned long image_size;
43 extern int in_suspend;
44 extern dev_t swsusp_resume_device;
45 extern sector_t swsusp_resume_block;
47 extern asmlinkage int swsusp_arch_suspend(void);
48 extern asmlinkage int swsusp_arch_resume(void);
50 extern unsigned int count_data_pages(void);
53 * Auxiliary structure used for reading the snapshot image data and
54 * metadata from and writing them to the list of page backup entries
55 * (PBEs) which is the main data structure of swsusp.
57 * Using struct snapshot_handle we can transfer the image, including its
58 * metadata, as a continuous sequence of bytes with the help of
59 * snapshot_read_next() and snapshot_write_next().
61 * The code that writes the image to a storage or transfers it to
62 * the user land is required to use snapshot_read_next() for this
63 * purpose and it should not make any assumptions regarding the internal
64 * structure of the image. Similarly, the code that reads the image from
65 * a storage or transfers it from the user land is required to use
66 * snapshot_write_next().
68 * This may allow us to change the internal structure of the image
69 * in the future with considerably less effort.
72 struct snapshot_handle {
73 loff_t offset; /* number of the last byte ready for reading
74 * or writing in the sequence
76 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
77 * next operation will refer to (ie. current)
79 unsigned int cur_offset; /* offset with respect to the current
80 * block (for the next operation)
82 unsigned int prev; /* number of the block of PAGE_SIZE bytes that
83 * was the current one previously
85 void *buffer; /* address of the block to read from
88 unsigned int buf_offset; /* location to read from or write to,
89 * given as a displacement from 'buffer'
91 int sync_read; /* Set to one to notify the caller of
92 * snapshot_write_next() that it may
93 * need to call wait_on_bio_chain()
97 /* This macro returns the address from/to which the caller of
98 * snapshot_read_next()/snapshot_write_next() is allowed to
99 * read/write data after the function returns
101 #define data_of(handle) ((handle).buffer + (handle).buf_offset)
103 extern unsigned int snapshot_additional_pages(struct zone *zone);
104 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
105 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
106 extern int snapshot_image_loaded(struct snapshot_handle *handle);
107 extern void snapshot_free_unused_memory(struct snapshot_handle *handle);
109 #define SNAPSHOT_IOC_MAGIC '3'
110 #define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
111 #define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
112 #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
113 #define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
114 #define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
115 #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
116 #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
117 #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
118 #define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
119 #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
120 #define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
121 #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
122 #define SNAPSHOT_IOC_MAXNR 12
124 #define PMOPS_PREPARE 1
125 #define PMOPS_ENTER 2
126 #define PMOPS_FINISH 3
129 * The bitmap is used for tracing allocated swap pages
131 * The entire bitmap consists of a number of bitmap_page
132 * structures linked with the help of the .next member.
133 * Thus each page can be allocated individually, so we only
134 * need to make 0-order memory allocations to create
138 #define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *))
139 #define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long))
140 #define BITS_PER_CHUNK (sizeof(long) * 8)
141 #define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
144 unsigned long chunks[BITMAP_PAGE_CHUNKS];
145 struct bitmap_page *next;
148 extern void free_bitmap(struct bitmap_page *bitmap);
149 extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
150 extern sector_t alloc_swapdev_block(int swap, struct bitmap_page *bitmap);
151 extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
153 extern int swsusp_check(void);
154 extern int swsusp_shrink_memory(void);
155 extern void swsusp_free(void);
156 extern int swsusp_suspend(void);
157 extern int swsusp_resume(void);
158 extern int swsusp_read(void);
159 extern int swsusp_write(void);
160 extern void swsusp_close(void);
161 extern int suspend_enter(suspend_state_t state);