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 int pfn_is_nosave(unsigned long);
28 extern struct mutex pm_mutex;
30 #define power_attr(_name) \
31 static struct subsys_attribute _name##_attr = { \
33 .name = __stringify(_name), \
36 .show = _name##_show, \
37 .store = _name##_store, \
40 extern struct kset power_subsys;
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 extern sector_t swsusp_resume_block;
48 extern asmlinkage int swsusp_arch_suspend(void);
49 extern asmlinkage int swsusp_arch_resume(void);
51 extern int create_basic_memory_bitmaps(void);
52 extern void free_basic_memory_bitmaps(void);
53 extern unsigned int count_data_pages(void);
56 * Auxiliary structure used for reading the snapshot image data and
57 * metadata from and writing them to the list of page backup entries
58 * (PBEs) which is the main data structure of swsusp.
60 * Using struct snapshot_handle we can transfer the image, including its
61 * metadata, as a continuous sequence of bytes with the help of
62 * snapshot_read_next() and snapshot_write_next().
64 * The code that writes the image to a storage or transfers it to
65 * the user land is required to use snapshot_read_next() for this
66 * purpose and it should not make any assumptions regarding the internal
67 * structure of the image. Similarly, the code that reads the image from
68 * a storage or transfers it from the user land is required to use
69 * snapshot_write_next().
71 * This may allow us to change the internal structure of the image
72 * in the future with considerably less effort.
75 struct snapshot_handle {
76 loff_t offset; /* number of the last byte ready for reading
77 * or writing in the sequence
79 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
80 * next operation will refer to (ie. current)
82 unsigned int cur_offset; /* offset with respect to the current
83 * block (for the next operation)
85 unsigned int prev; /* number of the block of PAGE_SIZE bytes that
86 * was the current one previously
88 void *buffer; /* address of the block to read from
91 unsigned int buf_offset; /* location to read from or write to,
92 * given as a displacement from 'buffer'
94 int sync_read; /* Set to one to notify the caller of
95 * snapshot_write_next() that it may
96 * need to call wait_on_bio_chain()
100 /* This macro returns the address from/to which the caller of
101 * snapshot_read_next()/snapshot_write_next() is allowed to
102 * read/write data after the function returns
104 #define data_of(handle) ((handle).buffer + (handle).buf_offset)
106 extern unsigned int snapshot_additional_pages(struct zone *zone);
107 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
108 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
109 extern void snapshot_write_finalize(struct snapshot_handle *handle);
110 extern int snapshot_image_loaded(struct snapshot_handle *handle);
113 * This structure is used to pass the values needed for the identification
114 * of the resume swap area from a user space to the kernel via the
115 * SNAPSHOT_SET_SWAP_AREA ioctl
117 struct resume_swap_area {
120 } __attribute__((packed));
122 #define SNAPSHOT_IOC_MAGIC '3'
123 #define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
124 #define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
125 #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
126 #define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
127 #define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
128 #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
129 #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
130 #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
131 #define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
132 #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
133 #define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
134 #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
135 #define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
136 struct resume_swap_area)
137 #define SNAPSHOT_IOC_MAXNR 13
139 #define PMOPS_PREPARE 1
140 #define PMOPS_ENTER 2
141 #define PMOPS_FINISH 3
143 /* If unset, the snapshot device cannot be open. */
144 extern atomic_t snapshot_device_available;
146 extern sector_t alloc_swapdev_block(int swap);
147 extern void free_all_swap_pages(int swap);
148 extern int swsusp_swap_in_use(void);
150 extern int swsusp_check(void);
151 extern int swsusp_shrink_memory(void);
152 extern void swsusp_free(void);
153 extern int swsusp_suspend(void);
154 extern int swsusp_resume(void);
155 extern int swsusp_read(void);
156 extern int swsusp_write(void);
157 extern void swsusp_close(void);
158 extern int suspend_enter(suspend_state_t state);
161 extern void swsusp_show_speed(struct timeval *, struct timeval *,
162 unsigned int, char *);