1 #include <linux/suspend.h>
2 #include <linux/suspend_ioctls.h>
3 #include <linux/utsname.h>
4 #include <linux/freezer.h>
7 struct new_utsname uts;
9 unsigned long num_physpages;
11 unsigned long image_pages;
14 } __attribute__((aligned(PAGE_SIZE)));
16 #ifdef CONFIG_HIBERNATION
17 /* kernel/power/snapshot.c */
18 extern void __init hibernate_reserved_size_init(void);
19 extern void __init hibernate_image_size_init(void);
21 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
22 /* Maximum size of architecture specific data in a hibernation header */
23 #define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
25 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
26 extern int arch_hibernation_header_restore(void *addr);
28 static inline int init_header_complete(struct swsusp_info *info)
30 return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
33 static inline char *check_image_kernel(struct swsusp_info *info)
35 return arch_hibernation_header_restore(info) ?
36 "architecture specific data" : NULL;
38 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
41 * Keep some memory free so that I/O operations can succeed without paging
42 * [Might this be more than 4 MB?]
44 #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
47 * Keep 1 MB of memory free so that device drivers can allocate some pages in
48 * their .suspend() routines without breaking the suspend to disk.
50 #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
52 /* kernel/power/hibernate.c */
53 extern int hibernation_snapshot(int platform_mode);
54 extern int hibernation_restore(int platform_mode);
55 extern int hibernation_platform_enter(void);
57 #else /* !CONFIG_HIBERNATION */
59 static inline void hibernate_reserved_size_init(void) {}
60 static inline void hibernate_image_size_init(void) {}
61 #endif /* !CONFIG_HIBERNATION */
63 extern int pfn_is_nosave(unsigned long);
65 #define power_attr(_name) \
66 static struct kobj_attribute _name##_attr = { \
68 .name = __stringify(_name), \
71 .show = _name##_show, \
72 .store = _name##_store, \
75 /* Preferred image size in bytes (default 500 MB) */
76 extern unsigned long image_size;
77 /* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
78 extern unsigned long reserved_size;
79 extern int in_suspend;
80 extern dev_t swsusp_resume_device;
81 extern sector_t swsusp_resume_block;
83 extern asmlinkage int swsusp_arch_suspend(void);
84 extern asmlinkage int swsusp_arch_resume(void);
86 extern int create_basic_memory_bitmaps(void);
87 extern void free_basic_memory_bitmaps(void);
88 extern int hibernate_preallocate_memory(void);
91 * Auxiliary structure used for reading the snapshot image data and
92 * metadata from and writing them to the list of page backup entries
93 * (PBEs) which is the main data structure of swsusp.
95 * Using struct snapshot_handle we can transfer the image, including its
96 * metadata, as a continuous sequence of bytes with the help of
97 * snapshot_read_next() and snapshot_write_next().
99 * The code that writes the image to a storage or transfers it to
100 * the user land is required to use snapshot_read_next() for this
101 * purpose and it should not make any assumptions regarding the internal
102 * structure of the image. Similarly, the code that reads the image from
103 * a storage or transfers it from the user land is required to use
104 * snapshot_write_next().
106 * This may allow us to change the internal structure of the image
107 * in the future with considerably less effort.
110 struct snapshot_handle {
111 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
112 * next operation will refer to (ie. current)
114 void *buffer; /* address of the block to read from
117 int sync_read; /* Set to one to notify the caller of
118 * snapshot_write_next() that it may
119 * need to call wait_on_bio_chain()
123 /* This macro returns the address from/to which the caller of
124 * snapshot_read_next()/snapshot_write_next() is allowed to
125 * read/write data after the function returns
127 #define data_of(handle) ((handle).buffer)
129 extern unsigned int snapshot_additional_pages(struct zone *zone);
130 extern unsigned long snapshot_get_image_size(void);
131 extern int snapshot_read_next(struct snapshot_handle *handle);
132 extern int snapshot_write_next(struct snapshot_handle *handle);
133 extern void snapshot_write_finalize(struct snapshot_handle *handle);
134 extern int snapshot_image_loaded(struct snapshot_handle *handle);
136 /* If unset, the snapshot device cannot be open. */
137 extern atomic_t snapshot_device_available;
139 extern sector_t alloc_swapdev_block(int swap);
140 extern void free_all_swap_pages(int swap);
141 extern int swsusp_swap_in_use(void);
144 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
147 #define SF_PLATFORM_MODE 1
148 #define SF_NOCOMPRESS_MODE 2
150 /* kernel/power/hibernate.c */
151 extern int swsusp_check(void);
152 extern void swsusp_free(void);
153 extern int swsusp_read(unsigned int *flags_p);
154 extern int swsusp_write(unsigned int flags);
155 extern void swsusp_close(fmode_t);
157 /* kernel/power/block_io.c */
158 extern struct block_device *hib_resume_bdev;
160 extern int hib_bio_read_page(pgoff_t page_off, void *addr,
161 struct bio **bio_chain);
162 extern int hib_bio_write_page(pgoff_t page_off, void *addr,
163 struct bio **bio_chain);
164 extern int hib_wait_on_bio_chain(struct bio **bio_chain);
167 /* kernel/power/swsusp.c */
168 extern void swsusp_show_speed(struct timeval *, struct timeval *,
169 unsigned int, char *);
171 #ifdef CONFIG_SUSPEND
172 /* kernel/power/suspend.c */
173 extern const char *const pm_states[];
175 extern bool valid_state(suspend_state_t state);
176 extern int suspend_devices_and_enter(suspend_state_t state);
177 extern int enter_state(suspend_state_t state);
178 #else /* !CONFIG_SUSPEND */
179 static inline int suspend_devices_and_enter(suspend_state_t state)
183 static inline int enter_state(suspend_state_t state) { return -ENOSYS; }
184 static inline bool valid_state(suspend_state_t state) { return false; }
185 #endif /* !CONFIG_SUSPEND */
187 #ifdef CONFIG_PM_TEST_SUSPEND
188 /* kernel/power/suspend_test.c */
189 extern void suspend_test_start(void);
190 extern void suspend_test_finish(const char *label);
191 #else /* !CONFIG_PM_TEST_SUSPEND */
192 static inline void suspend_test_start(void) {}
193 static inline void suspend_test_finish(const char *label) {}
194 #endif /* !CONFIG_PM_TEST_SUSPEND */
196 #ifdef CONFIG_PM_SLEEP
197 /* kernel/power/main.c */
198 extern int pm_notifier_call_chain(unsigned long val);
201 #ifdef CONFIG_HIGHMEM
202 int restore_highmem(void);
204 static inline unsigned int count_highmem_pages(void) { return 0; }
205 static inline int restore_highmem(void) { return 0; }
209 * Suspend test levels
223 #define TEST_FIRST TEST_NONE
224 #define TEST_MAX (__TEST_AFTER_LAST - 1)
226 extern int pm_test_level;
228 #ifdef CONFIG_SUSPEND_FREEZER
229 static inline int suspend_freeze_processes(void)
231 return freeze_processes();
234 static inline void suspend_thaw_processes(void)
239 static inline int suspend_freeze_processes(void)
244 static inline void suspend_thaw_processes(void)
249 #ifdef CONFIG_WAKELOCK
250 /* kernel/power/wakelock.c */
251 extern struct workqueue_struct *suspend_work_queue;
252 extern struct wake_lock main_wake_lock;
253 extern suspend_state_t requested_suspend_state;
256 #ifdef CONFIG_SUSPEND_SYNC_WORKQUEUE
257 extern void suspend_sys_sync_queue(void);
258 extern int suspend_sys_sync_wait(void);
261 #ifdef CONFIG_USER_WAKELOCK
262 ssize_t wake_lock_show(struct kobject *kobj, struct kobj_attribute *attr,
264 ssize_t wake_lock_store(struct kobject *kobj, struct kobj_attribute *attr,
265 const char *buf, size_t n);
266 ssize_t wake_unlock_show(struct kobject *kobj, struct kobj_attribute *attr,
268 ssize_t wake_unlock_store(struct kobject *kobj, struct kobj_attribute *attr,
269 const char *buf, size_t n);
272 #ifdef CONFIG_EARLYSUSPEND
273 /* kernel/power/earlysuspend.c */
274 void request_suspend_state(suspend_state_t state);
275 suspend_state_t get_suspend_state(void);