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 extern struct pbe *pagedir_nosave;
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;
48 extern asmlinkage int swsusp_arch_suspend(void);
49 extern asmlinkage int swsusp_arch_resume(void);
51 extern unsigned int count_data_pages(void);
54 * Auxiliary structure used for reading the snapshot image data and
55 * metadata from and writing them to the list of page backup entries
56 * (PBEs) which is the main data structure of swsusp.
58 * Using struct snapshot_handle we can transfer the image, including its
59 * metadata, as a continuous sequence of bytes with the help of
60 * snapshot_read_next() and snapshot_write_next().
62 * The code that writes the image to a storage or transfers it to
63 * the user land is required to use snapshot_read_next() for this
64 * purpose and it should not make any assumptions regarding the internal
65 * structure of the image. Similarly, the code that reads the image from
66 * a storage or transfers it from the user land is required to use
67 * snapshot_write_next().
69 * This may allow us to change the internal structure of the image
70 * in the future with considerably less effort.
73 struct snapshot_handle {
74 loff_t offset; /* number of the last byte ready for reading
75 * or writing in the sequence
77 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
78 * next operation will refer to (ie. current)
80 unsigned int cur_offset; /* offset with respect to the current
81 * block (for the next operation)
83 unsigned int prev; /* number of the block of PAGE_SIZE bytes that
84 * was the current one previously
86 struct pbe *pbe; /* PBE that corresponds to 'buffer' */
87 struct pbe *last_pbe; /* When the image is restored (eg. read
88 * from disk) we can store some image
89 * data directly in the page frames
90 * in which they were before suspend.
91 * In such a case the PBEs that
92 * correspond to them will be unused.
93 * This is the last PBE, so far, that
94 * does not correspond to such data.
96 void *buffer; /* address of the block to read from
99 unsigned int buf_offset; /* location to read from or write to,
100 * given as a displacement from 'buffer'
102 int sync_read; /* Set to one to notify the caller of
103 * snapshot_write_next() that it may
104 * need to call wait_on_bio_chain()
108 /* This macro returns the address from/to which the caller of
109 * snapshot_read_next()/snapshot_write_next() is allowed to
110 * read/write data after the function returns
112 #define data_of(handle) ((handle).buffer + (handle).buf_offset)
114 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
115 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
116 int snapshot_image_loaded(struct snapshot_handle *handle);
118 #define SNAPSHOT_IOC_MAGIC '3'
119 #define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
120 #define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
121 #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
122 #define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
123 #define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
124 #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
125 #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
126 #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
127 #define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
128 #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
129 #define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
130 #define SNAPSHOT_IOC_MAXNR 11
133 * The bitmap is used for tracing allocated swap pages
135 * The entire bitmap consists of a number of bitmap_page
136 * structures linked with the help of the .next member.
137 * Thus each page can be allocated individually, so we only
138 * need to make 0-order memory allocations to create
142 #define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *))
143 #define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long))
144 #define BITS_PER_CHUNK (sizeof(long) * 8)
145 #define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
148 unsigned long chunks[BITMAP_PAGE_CHUNKS];
149 struct bitmap_page *next;
152 extern void free_bitmap(struct bitmap_page *bitmap);
153 extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
154 extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
155 extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
157 extern int swsusp_check(void);
158 extern int swsusp_shrink_memory(void);
159 extern void swsusp_free(void);
160 extern int swsusp_suspend(void);
161 extern int swsusp_resume(void);
162 extern int swsusp_read(void);
163 extern int swsusp_write(void);
164 extern void swsusp_close(void);
165 extern int suspend_enter(suspend_state_t state);