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
18 * Keep some memory free so that I/O operations can succeed without paging
19 * [Might this be more than 4 MB?]
21 #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
23 * Keep 1 MB of memory free so that device drivers can allocate some pages in
24 * their .suspend() routines without breaking the suspend to disk.
26 #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
28 extern int pm_suspend_disk(void);
30 static inline int pm_suspend_disk(void)
36 extern int pfn_is_nosave(unsigned long);
38 extern struct mutex pm_mutex;
40 #define power_attr(_name) \
41 static struct subsys_attribute _name##_attr = { \
43 .name = __stringify(_name), \
46 .show = _name##_show, \
47 .store = _name##_store, \
50 extern struct kset power_subsys;
52 /* Preferred image size in bytes (default 500 MB) */
53 extern unsigned long image_size;
54 extern int in_suspend;
55 extern dev_t swsusp_resume_device;
56 extern sector_t swsusp_resume_block;
58 extern asmlinkage int swsusp_arch_suspend(void);
59 extern asmlinkage int swsusp_arch_resume(void);
61 extern int create_basic_memory_bitmaps(void);
62 extern void free_basic_memory_bitmaps(void);
63 extern unsigned int count_data_pages(void);
66 * Auxiliary structure used for reading the snapshot image data and
67 * metadata from and writing them to the list of page backup entries
68 * (PBEs) which is the main data structure of swsusp.
70 * Using struct snapshot_handle we can transfer the image, including its
71 * metadata, as a continuous sequence of bytes with the help of
72 * snapshot_read_next() and snapshot_write_next().
74 * The code that writes the image to a storage or transfers it to
75 * the user land is required to use snapshot_read_next() for this
76 * purpose and it should not make any assumptions regarding the internal
77 * structure of the image. Similarly, the code that reads the image from
78 * a storage or transfers it from the user land is required to use
79 * snapshot_write_next().
81 * This may allow us to change the internal structure of the image
82 * in the future with considerably less effort.
85 struct snapshot_handle {
86 loff_t offset; /* number of the last byte ready for reading
87 * or writing in the sequence
89 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
90 * next operation will refer to (ie. current)
92 unsigned int cur_offset; /* offset with respect to the current
93 * block (for the next operation)
95 unsigned int prev; /* number of the block of PAGE_SIZE bytes that
96 * was the current one previously
98 void *buffer; /* address of the block to read from
101 unsigned int buf_offset; /* location to read from or write to,
102 * given as a displacement from 'buffer'
104 int sync_read; /* Set to one to notify the caller of
105 * snapshot_write_next() that it may
106 * need to call wait_on_bio_chain()
110 /* This macro returns the address from/to which the caller of
111 * snapshot_read_next()/snapshot_write_next() is allowed to
112 * read/write data after the function returns
114 #define data_of(handle) ((handle).buffer + (handle).buf_offset)
116 extern unsigned int snapshot_additional_pages(struct zone *zone);
117 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
118 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
119 extern void snapshot_write_finalize(struct snapshot_handle *handle);
120 extern int snapshot_image_loaded(struct snapshot_handle *handle);
123 * This structure is used to pass the values needed for the identification
124 * of the resume swap area from a user space to the kernel via the
125 * SNAPSHOT_SET_SWAP_AREA ioctl
127 struct resume_swap_area {
130 } __attribute__((packed));
132 #define SNAPSHOT_IOC_MAGIC '3'
133 #define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
134 #define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
135 #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
136 #define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
137 #define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
138 #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
139 #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
140 #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
141 #define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
142 #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
143 #define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
144 #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
145 #define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
146 struct resume_swap_area)
147 #define SNAPSHOT_IOC_MAXNR 13
149 #define PMOPS_PREPARE 1
150 #define PMOPS_ENTER 2
151 #define PMOPS_FINISH 3
153 /* If unset, the snapshot device cannot be open. */
154 extern atomic_t snapshot_device_available;
156 extern sector_t alloc_swapdev_block(int swap);
157 extern void free_all_swap_pages(int swap);
158 extern int swsusp_swap_in_use(void);
160 extern int swsusp_check(void);
161 extern int swsusp_shrink_memory(void);
162 extern void swsusp_free(void);
163 extern int swsusp_suspend(void);
164 extern int swsusp_resume(void);
165 extern int swsusp_read(void);
166 extern int swsusp_write(void);
167 extern void swsusp_close(void);
168 extern int suspend_enter(suspend_state_t state);
171 extern void swsusp_show_speed(struct timeval *, struct timeval *,
172 unsigned int, char *);