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)));
14 #ifdef CONFIG_HIBERNATION
15 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
16 /* Maximum size of architecture specific data in a hibernation header */
17 #define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
19 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
20 extern int arch_hibernation_header_restore(void *addr);
22 static inline int init_header_complete(struct swsusp_info *info)
24 return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
27 static inline char *check_image_kernel(struct swsusp_info *info)
29 return arch_hibernation_header_restore(info) ?
30 "architecture specific data" : NULL;
32 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
35 * Keep some memory free so that I/O operations can succeed without paging
36 * [Might this be more than 4 MB?]
38 #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
41 * Keep 1 MB of memory free so that device drivers can allocate some pages in
42 * their .suspend() routines without breaking the suspend to disk.
44 #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
46 /* kernel/power/disk.c */
47 extern int hibernation_snapshot(int platform_mode);
48 extern int hibernation_restore(int platform_mode);
49 extern int hibernation_platform_enter(void);
52 extern int pfn_is_nosave(unsigned long);
54 extern struct mutex pm_mutex;
56 #define power_attr(_name) \
57 static struct subsys_attribute _name##_attr = { \
59 .name = __stringify(_name), \
62 .show = _name##_show, \
63 .store = _name##_store, \
66 extern struct kset power_subsys;
68 /* Preferred image size in bytes (default 500 MB) */
69 extern unsigned long image_size;
70 extern int in_suspend;
71 extern dev_t swsusp_resume_device;
72 extern sector_t swsusp_resume_block;
74 extern asmlinkage int swsusp_arch_suspend(void);
75 extern asmlinkage int swsusp_arch_resume(void);
77 extern int create_basic_memory_bitmaps(void);
78 extern void free_basic_memory_bitmaps(void);
79 extern unsigned int count_data_pages(void);
82 * Auxiliary structure used for reading the snapshot image data and
83 * metadata from and writing them to the list of page backup entries
84 * (PBEs) which is the main data structure of swsusp.
86 * Using struct snapshot_handle we can transfer the image, including its
87 * metadata, as a continuous sequence of bytes with the help of
88 * snapshot_read_next() and snapshot_write_next().
90 * The code that writes the image to a storage or transfers it to
91 * the user land is required to use snapshot_read_next() for this
92 * purpose and it should not make any assumptions regarding the internal
93 * structure of the image. Similarly, the code that reads the image from
94 * a storage or transfers it from the user land is required to use
95 * snapshot_write_next().
97 * This may allow us to change the internal structure of the image
98 * in the future with considerably less effort.
101 struct snapshot_handle {
102 loff_t offset; /* number of the last byte ready for reading
103 * or writing in the sequence
105 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
106 * next operation will refer to (ie. current)
108 unsigned int cur_offset; /* offset with respect to the current
109 * block (for the next operation)
111 unsigned int prev; /* number of the block of PAGE_SIZE bytes that
112 * was the current one previously
114 void *buffer; /* address of the block to read from
117 unsigned int buf_offset; /* location to read from or write to,
118 * given as a displacement from 'buffer'
120 int sync_read; /* Set to one to notify the caller of
121 * snapshot_write_next() that it may
122 * need to call wait_on_bio_chain()
126 /* This macro returns the address from/to which the caller of
127 * snapshot_read_next()/snapshot_write_next() is allowed to
128 * read/write data after the function returns
130 #define data_of(handle) ((handle).buffer + (handle).buf_offset)
132 extern unsigned int snapshot_additional_pages(struct zone *zone);
133 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
134 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
135 extern void snapshot_write_finalize(struct snapshot_handle *handle);
136 extern int snapshot_image_loaded(struct snapshot_handle *handle);
139 * This structure is used to pass the values needed for the identification
140 * of the resume swap area from a user space to the kernel via the
141 * SNAPSHOT_SET_SWAP_AREA ioctl
143 struct resume_swap_area {
146 } __attribute__((packed));
148 #define SNAPSHOT_IOC_MAGIC '3'
149 #define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
150 #define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
151 #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
152 #define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
153 #define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
154 #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
155 #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
156 #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
157 #define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
158 #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
159 #define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
160 #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
161 #define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
162 struct resume_swap_area)
163 #define SNAPSHOT_IOC_MAXNR 13
165 #define PMOPS_PREPARE 1
166 #define PMOPS_ENTER 2
167 #define PMOPS_FINISH 3
169 /* If unset, the snapshot device cannot be open. */
170 extern atomic_t snapshot_device_available;
172 extern sector_t alloc_swapdev_block(int swap);
173 extern void free_all_swap_pages(int swap);
174 extern int swsusp_swap_in_use(void);
177 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
180 #define SF_PLATFORM_MODE 1
182 /* kernel/power/disk.c */
183 extern int swsusp_check(void);
184 extern int swsusp_shrink_memory(void);
185 extern void swsusp_free(void);
186 extern int swsusp_resume(void);
187 extern int swsusp_read(unsigned int *flags_p);
188 extern int swsusp_write(unsigned int flags);
189 extern void swsusp_close(void);
192 /* kernel/power/swsusp.c */
193 extern void swsusp_show_speed(struct timeval *, struct timeval *,
194 unsigned int, char *);
196 #ifdef CONFIG_SUSPEND
197 /* kernel/power/main.c */
198 extern int suspend_devices_and_enter(suspend_state_t state);
199 #else /* !CONFIG_SUSPEND */
200 static inline int suspend_devices_and_enter(suspend_state_t state)
204 #endif /* !CONFIG_SUSPEND */
206 /* kernel/power/common.c */
207 extern struct blocking_notifier_head pm_chain_head;
209 static inline int pm_notifier_call_chain(unsigned long val)
211 return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
212 == NOTIFY_BAD) ? -EINVAL : 0;