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)
26 extern struct mutex pm_mutex;
28 #define power_attr(_name) \
29 static struct subsys_attribute _name##_attr = { \
31 .name = __stringify(_name), \
34 .show = _name##_show, \
35 .store = _name##_store, \
38 extern struct subsystem power_subsys;
40 /* References to section boundaries */
41 extern const void __nosave_begin, __nosave_end;
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 extern sector_t swsusp_resume_block;
49 extern asmlinkage int swsusp_arch_suspend(void);
50 extern asmlinkage int swsusp_arch_resume(void);
52 extern unsigned int count_data_pages(void);
55 * Auxiliary structure used for reading the snapshot image data and
56 * metadata from and writing them to the list of page backup entries
57 * (PBEs) which is the main data structure of swsusp.
59 * Using struct snapshot_handle we can transfer the image, including its
60 * metadata, as a continuous sequence of bytes with the help of
61 * snapshot_read_next() and snapshot_write_next().
63 * The code that writes the image to a storage or transfers it to
64 * the user land is required to use snapshot_read_next() for this
65 * purpose and it should not make any assumptions regarding the internal
66 * structure of the image. Similarly, the code that reads the image from
67 * a storage or transfers it from the user land is required to use
68 * snapshot_write_next().
70 * This may allow us to change the internal structure of the image
71 * in the future with considerably less effort.
74 struct snapshot_handle {
75 loff_t offset; /* number of the last byte ready for reading
76 * or writing in the sequence
78 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
79 * next operation will refer to (ie. current)
81 unsigned int cur_offset; /* offset with respect to the current
82 * block (for the next operation)
84 unsigned int prev; /* number of the block of PAGE_SIZE bytes that
85 * was the current one previously
87 void *buffer; /* address of the block to read from
90 unsigned int buf_offset; /* location to read from or write to,
91 * given as a displacement from 'buffer'
93 int sync_read; /* Set to one to notify the caller of
94 * snapshot_write_next() that it may
95 * need to call wait_on_bio_chain()
99 /* This macro returns the address from/to which the caller of
100 * snapshot_read_next()/snapshot_write_next() is allowed to
101 * read/write data after the function returns
103 #define data_of(handle) ((handle).buffer + (handle).buf_offset)
105 extern unsigned int snapshot_additional_pages(struct zone *zone);
106 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
107 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
108 extern void snapshot_write_finalize(struct snapshot_handle *handle);
109 extern int snapshot_image_loaded(struct snapshot_handle *handle);
112 * This structure is used to pass the values needed for the identification
113 * of the resume swap area from a user space to the kernel via the
114 * SNAPSHOT_SET_SWAP_AREA ioctl
116 struct resume_swap_area {
119 } __attribute__((packed));
121 #define SNAPSHOT_IOC_MAGIC '3'
122 #define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
123 #define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
124 #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
125 #define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
126 #define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
127 #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
128 #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
129 #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
130 #define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
131 #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
132 #define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
133 #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
134 #define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
135 struct resume_swap_area)
136 #define SNAPSHOT_IOC_MAXNR 13
138 #define PMOPS_PREPARE 1
139 #define PMOPS_ENTER 2
140 #define PMOPS_FINISH 3
143 * The bitmap is used for tracing allocated swap pages
145 * The entire bitmap consists of a number of bitmap_page
146 * structures linked with the help of the .next member.
147 * Thus each page can be allocated individually, so we only
148 * need to make 0-order memory allocations to create
152 #define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *))
153 #define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long))
154 #define BITS_PER_CHUNK (sizeof(long) * 8)
155 #define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
158 unsigned long chunks[BITMAP_PAGE_CHUNKS];
159 struct bitmap_page *next;
162 extern void free_bitmap(struct bitmap_page *bitmap);
163 extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
164 extern sector_t alloc_swapdev_block(int swap, struct bitmap_page *bitmap);
165 extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
167 extern int swsusp_check(void);
168 extern int swsusp_shrink_memory(void);
169 extern void swsusp_free(void);
170 extern int swsusp_suspend(void);
171 extern int swsusp_resume(void);
172 extern int swsusp_read(void);
173 extern int swsusp_write(void);
174 extern void swsusp_close(void);
175 extern int suspend_enter(suspend_state_t state);
178 extern void swsusp_show_speed(struct timeval *, struct timeval *,
179 unsigned int, char *);