1 #include <linux/suspend.h>
2 #include <linux/suspend_ioctls.h>
3 #include <linux/utsname.h>
4 #include <linux/freezer.h>
5 #include <linux/compiler.h>
8 struct new_utsname uts;
10 unsigned long num_physpages;
12 unsigned long image_pages;
15 } __aligned(PAGE_SIZE);
17 #ifdef CONFIG_HIBERNATION
18 /* kernel/power/snapshot.c */
19 extern void __init hibernate_reserved_size_init(void);
20 extern void __init hibernate_image_size_init(void);
22 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
23 /* Maximum size of architecture specific data in a hibernation header */
24 #define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
26 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
27 extern int arch_hibernation_header_restore(void *addr);
29 static inline int init_header_complete(struct swsusp_info *info)
31 return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
34 static inline char *check_image_kernel(struct swsusp_info *info)
36 return arch_hibernation_header_restore(info) ?
37 "architecture specific data" : NULL;
39 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
41 extern int hibernate_resume_nonboot_cpu_disable(void);
44 * Keep some memory free so that I/O operations can succeed without paging
45 * [Might this be more than 4 MB?]
47 #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
50 * Keep 1 MB of memory free so that device drivers can allocate some pages in
51 * their .suspend() routines without breaking the suspend to disk.
53 #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
55 asmlinkage int swsusp_save(void);
57 /* kernel/power/hibernate.c */
58 extern bool freezer_test_done;
60 extern int hibernation_snapshot(int platform_mode);
61 extern int hibernation_restore(int platform_mode);
62 extern int hibernation_platform_enter(void);
64 #ifdef CONFIG_DEBUG_RODATA
65 /* kernel/power/snapshot.c */
66 extern void enable_restore_image_protection(void);
68 static inline void enable_restore_image_protection(void) {}
69 #endif /* CONFIG_DEBUG_RODATA */
71 #else /* !CONFIG_HIBERNATION */
73 static inline void hibernate_reserved_size_init(void) {}
74 static inline void hibernate_image_size_init(void) {}
75 #endif /* !CONFIG_HIBERNATION */
77 extern int pfn_is_nosave(unsigned long);
79 #define power_attr(_name) \
80 static struct kobj_attribute _name##_attr = { \
82 .name = __stringify(_name), \
85 .show = _name##_show, \
86 .store = _name##_store, \
89 #define power_attr_ro(_name) \
90 static struct kobj_attribute _name##_attr = { \
92 .name = __stringify(_name), \
95 .show = _name##_show, \
98 /* Preferred image size in bytes (default 500 MB) */
99 extern unsigned long image_size;
100 /* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
101 extern unsigned long reserved_size;
102 extern int in_suspend;
103 extern dev_t swsusp_resume_device;
104 extern sector_t swsusp_resume_block;
106 extern int create_basic_memory_bitmaps(void);
107 extern void free_basic_memory_bitmaps(void);
108 extern int hibernate_preallocate_memory(void);
110 extern void clear_free_pages(void);
113 * Auxiliary structure used for reading the snapshot image data and
114 * metadata from and writing them to the list of page backup entries
115 * (PBEs) which is the main data structure of swsusp.
117 * Using struct snapshot_handle we can transfer the image, including its
118 * metadata, as a continuous sequence of bytes with the help of
119 * snapshot_read_next() and snapshot_write_next().
121 * The code that writes the image to a storage or transfers it to
122 * the user land is required to use snapshot_read_next() for this
123 * purpose and it should not make any assumptions regarding the internal
124 * structure of the image. Similarly, the code that reads the image from
125 * a storage or transfers it from the user land is required to use
126 * snapshot_write_next().
128 * This may allow us to change the internal structure of the image
129 * in the future with considerably less effort.
132 struct snapshot_handle {
133 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
134 * next operation will refer to (ie. current)
136 void *buffer; /* address of the block to read from
139 int sync_read; /* Set to one to notify the caller of
140 * snapshot_write_next() that it may
141 * need to call wait_on_bio_chain()
145 /* This macro returns the address from/to which the caller of
146 * snapshot_read_next()/snapshot_write_next() is allowed to
147 * read/write data after the function returns
149 #define data_of(handle) ((handle).buffer)
151 extern unsigned int snapshot_additional_pages(struct zone *zone);
152 extern unsigned long snapshot_get_image_size(void);
153 extern int snapshot_read_next(struct snapshot_handle *handle);
154 extern int snapshot_write_next(struct snapshot_handle *handle);
155 extern void snapshot_write_finalize(struct snapshot_handle *handle);
156 extern int snapshot_image_loaded(struct snapshot_handle *handle);
158 /* If unset, the snapshot device cannot be open. */
159 extern atomic_t snapshot_device_available;
161 extern sector_t alloc_swapdev_block(int swap);
162 extern void free_all_swap_pages(int swap);
163 extern int swsusp_swap_in_use(void);
166 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
169 #define SF_PLATFORM_MODE 1
170 #define SF_NOCOMPRESS_MODE 2
171 #define SF_CRC32_MODE 4
173 /* kernel/power/hibernate.c */
174 extern int swsusp_check(void);
175 extern void swsusp_free(void);
176 extern int swsusp_read(unsigned int *flags_p);
177 extern int swsusp_write(unsigned int flags);
178 extern void swsusp_close(fmode_t);
179 #ifdef CONFIG_SUSPEND
180 extern int swsusp_unmark(void);
184 /* kernel/power/swsusp.c */
185 extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
187 #ifdef CONFIG_SUSPEND
188 /* kernel/power/suspend.c */
189 extern const char *pm_labels[];
190 extern const char *pm_states[];
192 extern int suspend_devices_and_enter(suspend_state_t state);
193 #else /* !CONFIG_SUSPEND */
194 static inline int suspend_devices_and_enter(suspend_state_t state)
198 #endif /* !CONFIG_SUSPEND */
200 #ifdef CONFIG_PM_TEST_SUSPEND
201 /* kernel/power/suspend_test.c */
202 extern void suspend_test_start(void);
203 extern void suspend_test_finish(const char *label);
204 #else /* !CONFIG_PM_TEST_SUSPEND */
205 static inline void suspend_test_start(void) {}
206 static inline void suspend_test_finish(const char *label) {}
207 #endif /* !CONFIG_PM_TEST_SUSPEND */
209 #ifdef CONFIG_PM_SLEEP
210 /* kernel/power/main.c */
211 extern int __pm_notifier_call_chain(unsigned long val, int nr_to_call,
213 extern int pm_notifier_call_chain(unsigned long val);
216 #ifdef CONFIG_HIGHMEM
217 int restore_highmem(void);
219 static inline unsigned int count_highmem_pages(void) { return 0; }
220 static inline int restore_highmem(void) { return 0; }
224 * Suspend test levels
238 #define TEST_FIRST TEST_NONE
239 #define TEST_MAX (__TEST_AFTER_LAST - 1)
241 extern int pm_test_level;
243 #ifdef CONFIG_SUSPEND_FREEZER
244 static inline int suspend_freeze_processes(void)
248 error = freeze_processes();
250 * freeze_processes() automatically thaws every task if freezing
251 * fails. So we need not do anything extra upon error.
256 error = freeze_kernel_threads();
258 * freeze_kernel_threads() thaws only kernel threads upon freezing
259 * failure. So we have to thaw the userspace tasks ourselves.
267 static inline void suspend_thaw_processes(void)
272 static inline int suspend_freeze_processes(void)
277 static inline void suspend_thaw_processes(void)
282 #ifdef CONFIG_PM_AUTOSLEEP
284 /* kernel/power/autosleep.c */
285 extern int pm_autosleep_init(void);
286 extern int pm_autosleep_lock(void);
287 extern void pm_autosleep_unlock(void);
288 extern suspend_state_t pm_autosleep_state(void);
289 extern int pm_autosleep_set_state(suspend_state_t state);
291 #else /* !CONFIG_PM_AUTOSLEEP */
293 static inline int pm_autosleep_init(void) { return 0; }
294 static inline int pm_autosleep_lock(void) { return 0; }
295 static inline void pm_autosleep_unlock(void) {}
296 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
298 #endif /* !CONFIG_PM_AUTOSLEEP */
300 #ifdef CONFIG_PM_WAKELOCKS
302 /* kernel/power/wakelock.c */
303 extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
304 extern int pm_wake_lock(const char *buf);
305 extern int pm_wake_unlock(const char *buf);
307 #endif /* !CONFIG_PM_WAKELOCKS */