1#include <linux/suspend.h>
  2#include <linux/suspend_ioctls.h>
  3#include <linux/utsname.h>
  4#include <linux/freezer.h>
  5
  6struct swsusp_info {
  7	struct new_utsname	uts;
  8	u32			version_code;
  9	unsigned long		num_physpages;
 10	int			cpus;
 11	unsigned long		image_pages;
 12	unsigned long		pages;
 13	unsigned long		size;
 14} __attribute__((aligned(PAGE_SIZE)));
 15
 16#ifdef CONFIG_HIBERNATION
 17/* kernel/power/snapshot.c */
 18extern void __init hibernate_reserved_size_init(void);
 19extern void __init hibernate_image_size_init(void);
 20
 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)
 24
 25extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
 26extern int arch_hibernation_header_restore(void *addr);
 27
 28static inline int init_header_complete(struct swsusp_info *info)
 29{
 30	return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
 31}
 32
 33static inline char *check_image_kernel(struct swsusp_info *info)
 34{
 35	return arch_hibernation_header_restore(info) ?
 36			"architecture specific data" : NULL;
 37}
 38#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
 39
 40/*
 41 * Keep some memory free so that I/O operations can succeed without paging
 42 * [Might this be more than 4 MB?]
 43 */
 44#define PAGES_FOR_IO	((4096 * 1024) >> PAGE_SHIFT)
 45
 46/*
 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.
 49 */
 50#define SPARE_PAGES	((1024 * 1024) >> PAGE_SHIFT)
 51
 52/* kernel/power/hibernate.c */
 
 
 53extern int hibernation_snapshot(int platform_mode);
 54extern int hibernation_restore(int platform_mode);
 55extern int hibernation_platform_enter(void);
 56
 57#else /* !CONFIG_HIBERNATION */
 58
 59static inline void hibernate_reserved_size_init(void) {}
 60static inline void hibernate_image_size_init(void) {}
 61#endif /* !CONFIG_HIBERNATION */
 62
 63extern int pfn_is_nosave(unsigned long);
 64
 65#define power_attr(_name) \
 66static struct kobj_attribute _name##_attr = {	\
 67	.attr	= {				\
 68		.name = __stringify(_name),	\
 69		.mode = 0644,			\
 70	},					\
 71	.show	= _name##_show,			\
 72	.store	= _name##_store,		\
 73}
 74
 75/* Preferred image size in bytes (default 500 MB) */
 76extern unsigned long image_size;
 77/* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
 78extern unsigned long reserved_size;
 79extern int in_suspend;
 80extern dev_t swsusp_resume_device;
 81extern sector_t swsusp_resume_block;
 82
 83extern asmlinkage int swsusp_arch_suspend(void);
 84extern asmlinkage int swsusp_arch_resume(void);
 85
 86extern int create_basic_memory_bitmaps(void);
 87extern void free_basic_memory_bitmaps(void);
 88extern int hibernate_preallocate_memory(void);
 89
 90/**
 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.
 94 *
 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().
 98 *
 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().
105 *
106 *	This may allow us to change the internal structure of the image
107 *	in the future with considerably less effort.
108 */
109
110struct snapshot_handle {
111	unsigned int	cur;	/* number of the block of PAGE_SIZE bytes the
112				 * next operation will refer to (ie. current)
113				 */
114	void		*buffer;	/* address of the block to read from
115					 * or write to
116					 */
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()
120					 */
121};
122
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
126 */
127#define data_of(handle)	((handle).buffer)
128
129extern unsigned int snapshot_additional_pages(struct zone *zone);
130extern unsigned long snapshot_get_image_size(void);
131extern int snapshot_read_next(struct snapshot_handle *handle);
132extern int snapshot_write_next(struct snapshot_handle *handle);
133extern void snapshot_write_finalize(struct snapshot_handle *handle);
134extern int snapshot_image_loaded(struct snapshot_handle *handle);
135
136/* If unset, the snapshot device cannot be open. */
137extern atomic_t snapshot_device_available;
138
139extern sector_t alloc_swapdev_block(int swap);
140extern void free_all_swap_pages(int swap);
141extern int swsusp_swap_in_use(void);
142
143/*
144 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
145 * the image header.
146 */
147#define SF_PLATFORM_MODE	1
148#define SF_NOCOMPRESS_MODE	2
 
149
150/* kernel/power/hibernate.c */
151extern int swsusp_check(void);
152extern void swsusp_free(void);
153extern int swsusp_read(unsigned int *flags_p);
154extern int swsusp_write(unsigned int flags);
155extern void swsusp_close(fmode_t);
156
157/* kernel/power/block_io.c */
158extern struct block_device *hib_resume_bdev;
159
160extern int hib_bio_read_page(pgoff_t page_off, void *addr,
161		struct bio **bio_chain);
162extern int hib_bio_write_page(pgoff_t page_off, void *addr,
163		struct bio **bio_chain);
164extern int hib_wait_on_bio_chain(struct bio **bio_chain);
165
166struct timeval;
167/* kernel/power/swsusp.c */
168extern void swsusp_show_speed(struct timeval *, struct timeval *,
169				unsigned int, char *);
170
171#ifdef CONFIG_SUSPEND
172/* kernel/power/suspend.c */
173extern const char *const pm_states[];
174
175extern bool valid_state(suspend_state_t state);
176extern int suspend_devices_and_enter(suspend_state_t state);
177extern int enter_state(suspend_state_t state);
178#else /* !CONFIG_SUSPEND */
179static inline int suspend_devices_and_enter(suspend_state_t state)
180{
181	return -ENOSYS;
182}
183static inline int enter_state(suspend_state_t state) { return -ENOSYS; }
184static inline bool valid_state(suspend_state_t state) { return false; }
185#endif /* !CONFIG_SUSPEND */
186
187#ifdef CONFIG_PM_TEST_SUSPEND
188/* kernel/power/suspend_test.c */
189extern void suspend_test_start(void);
190extern void suspend_test_finish(const char *label);
191#else /* !CONFIG_PM_TEST_SUSPEND */
192static inline void suspend_test_start(void) {}
193static inline void suspend_test_finish(const char *label) {}
194#endif /* !CONFIG_PM_TEST_SUSPEND */
195
196#ifdef CONFIG_PM_SLEEP
197/* kernel/power/main.c */
198extern int pm_notifier_call_chain(unsigned long val);
199#endif
200
201#ifdef CONFIG_HIGHMEM
202int restore_highmem(void);
203#else
204static inline unsigned int count_highmem_pages(void) { return 0; }
205static inline int restore_highmem(void) { return 0; }
206#endif
207
208/*
209 * Suspend test levels
210 */
211enum {
212	/* keep first */
213	TEST_NONE,
214	TEST_CORE,
215	TEST_CPUS,
216	TEST_PLATFORM,
217	TEST_DEVICES,
218	TEST_FREEZER,
219	/* keep last */
220	__TEST_AFTER_LAST
221};
222
223#define TEST_FIRST	TEST_NONE
224#define TEST_MAX	(__TEST_AFTER_LAST - 1)
225
226extern int pm_test_level;
227
228#ifdef CONFIG_SUSPEND_FREEZER
229static inline int suspend_freeze_processes(void)
230{
231	return freeze_processes();
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
232}
233
234static inline void suspend_thaw_processes(void)
235{
236	thaw_processes();
237}
238#else
239static inline int suspend_freeze_processes(void)
240{
241	return 0;
242}
243
244static inline void suspend_thaw_processes(void)
245{
246}
247#endif

  1#include <linux/suspend.h>
  2#include <linux/suspend_ioctls.h>
  3#include <linux/utsname.h>
  4#include <linux/freezer.h>
  5
  6struct swsusp_info {
  7	struct new_utsname	uts;
  8	u32			version_code;
  9	unsigned long		num_physpages;
 10	int			cpus;
 11	unsigned long		image_pages;
 12	unsigned long		pages;
 13	unsigned long		size;
 14} __attribute__((aligned(PAGE_SIZE)));
 15
 16#ifdef CONFIG_HIBERNATION
 17/* kernel/power/snapshot.c */
 18extern void __init hibernate_reserved_size_init(void);
 19extern void __init hibernate_image_size_init(void);
 20
 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)
 24
 25extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
 26extern int arch_hibernation_header_restore(void *addr);
 27
 28static inline int init_header_complete(struct swsusp_info *info)
 29{
 30	return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
 31}
 32
 33static inline char *check_image_kernel(struct swsusp_info *info)
 34{
 35	return arch_hibernation_header_restore(info) ?
 36			"architecture specific data" : NULL;
 37}
 38#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
 39
 40/*
 41 * Keep some memory free so that I/O operations can succeed without paging
 42 * [Might this be more than 4 MB?]
 43 */
 44#define PAGES_FOR_IO	((4096 * 1024) >> PAGE_SHIFT)
 45
 46/*
 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.
 49 */
 50#define SPARE_PAGES	((1024 * 1024) >> PAGE_SHIFT)
 51
 52/* kernel/power/hibernate.c */
 53extern bool freezer_test_done;
 54
 55extern int hibernation_snapshot(int platform_mode);
 56extern int hibernation_restore(int platform_mode);
 57extern int hibernation_platform_enter(void);
 58
 59#else /* !CONFIG_HIBERNATION */
 60
 61static inline void hibernate_reserved_size_init(void) {}
 62static inline void hibernate_image_size_init(void) {}
 63#endif /* !CONFIG_HIBERNATION */
 64
 65extern int pfn_is_nosave(unsigned long);
 66
 67#define power_attr(_name) \
 68static struct kobj_attribute _name##_attr = {	\
 69	.attr	= {				\
 70		.name = __stringify(_name),	\
 71		.mode = 0644,			\
 72	},					\
 73	.show	= _name##_show,			\
 74	.store	= _name##_store,		\
 75}
 76
 77/* Preferred image size in bytes (default 500 MB) */
 78extern unsigned long image_size;
 79/* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
 80extern unsigned long reserved_size;
 81extern int in_suspend;
 82extern dev_t swsusp_resume_device;
 83extern sector_t swsusp_resume_block;
 84
 85extern asmlinkage int swsusp_arch_suspend(void);
 86extern asmlinkage int swsusp_arch_resume(void);
 87
 88extern int create_basic_memory_bitmaps(void);
 89extern void free_basic_memory_bitmaps(void);
 90extern int hibernate_preallocate_memory(void);
 91
 92/**
 93 *	Auxiliary structure used for reading the snapshot image data and
 94 *	metadata from and writing them to the list of page backup entries
 95 *	(PBEs) which is the main data structure of swsusp.
 96 *
 97 *	Using struct snapshot_handle we can transfer the image, including its
 98 *	metadata, as a continuous sequence of bytes with the help of
 99 *	snapshot_read_next() and snapshot_write_next().
100 *
101 *	The code that writes the image to a storage or transfers it to
102 *	the user land is required to use snapshot_read_next() for this
103 *	purpose and it should not make any assumptions regarding the internal
104 *	structure of the image.  Similarly, the code that reads the image from
105 *	a storage or transfers it from the user land is required to use
106 *	snapshot_write_next().
107 *
108 *	This may allow us to change the internal structure of the image
109 *	in the future with considerably less effort.
110 */
111
112struct snapshot_handle {
113	unsigned int	cur;	/* number of the block of PAGE_SIZE bytes the
114				 * next operation will refer to (ie. current)
115				 */
116	void		*buffer;	/* address of the block to read from
117					 * or write to
118					 */
119	int		sync_read;	/* Set to one to notify the caller of
120					 * snapshot_write_next() that it may
121					 * need to call wait_on_bio_chain()
122					 */
123};
124
125/* This macro returns the address from/to which the caller of
126 * snapshot_read_next()/snapshot_write_next() is allowed to
127 * read/write data after the function returns
128 */
129#define data_of(handle)	((handle).buffer)
130
131extern unsigned int snapshot_additional_pages(struct zone *zone);
132extern unsigned long snapshot_get_image_size(void);
133extern int snapshot_read_next(struct snapshot_handle *handle);
134extern int snapshot_write_next(struct snapshot_handle *handle);
135extern void snapshot_write_finalize(struct snapshot_handle *handle);
136extern int snapshot_image_loaded(struct snapshot_handle *handle);
137
138/* If unset, the snapshot device cannot be open. */
139extern atomic_t snapshot_device_available;
140
141extern sector_t alloc_swapdev_block(int swap);
142extern void free_all_swap_pages(int swap);
143extern int swsusp_swap_in_use(void);
144
145/*
146 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
147 * the image header.
148 */
149#define SF_PLATFORM_MODE	1
150#define SF_NOCOMPRESS_MODE	2
151#define SF_CRC32_MODE	        4
152
153/* kernel/power/hibernate.c */
154extern int swsusp_check(void);
155extern void swsusp_free(void);
156extern int swsusp_read(unsigned int *flags_p);
157extern int swsusp_write(unsigned int flags);
158extern void swsusp_close(fmode_t);
159
160/* kernel/power/block_io.c */
161extern struct block_device *hib_resume_bdev;
162
163extern int hib_bio_read_page(pgoff_t page_off, void *addr,
164		struct bio **bio_chain);
165extern int hib_bio_write_page(pgoff_t page_off, void *addr,
166		struct bio **bio_chain);
167extern int hib_wait_on_bio_chain(struct bio **bio_chain);
168
169struct timeval;
170/* kernel/power/swsusp.c */
171extern void swsusp_show_speed(struct timeval *, struct timeval *,
172				unsigned int, char *);
173
174#ifdef CONFIG_SUSPEND
175/* kernel/power/suspend.c */
176extern const char *const pm_states[];
177
178extern bool valid_state(suspend_state_t state);
179extern int suspend_devices_and_enter(suspend_state_t state);
 
180#else /* !CONFIG_SUSPEND */
181static inline int suspend_devices_and_enter(suspend_state_t state)
182{
183	return -ENOSYS;
184}
 
185static inline bool valid_state(suspend_state_t state) { return false; }
186#endif /* !CONFIG_SUSPEND */
187
188#ifdef CONFIG_PM_TEST_SUSPEND
189/* kernel/power/suspend_test.c */
190extern void suspend_test_start(void);
191extern void suspend_test_finish(const char *label);
192#else /* !CONFIG_PM_TEST_SUSPEND */
193static inline void suspend_test_start(void) {}
194static inline void suspend_test_finish(const char *label) {}
195#endif /* !CONFIG_PM_TEST_SUSPEND */
196
197#ifdef CONFIG_PM_SLEEP
198/* kernel/power/main.c */
199extern int pm_notifier_call_chain(unsigned long val);
200#endif
201
202#ifdef CONFIG_HIGHMEM
203int restore_highmem(void);
204#else
205static inline unsigned int count_highmem_pages(void) { return 0; }
206static inline int restore_highmem(void) { return 0; }
207#endif
208
209/*
210 * Suspend test levels
211 */
212enum {
213	/* keep first */
214	TEST_NONE,
215	TEST_CORE,
216	TEST_CPUS,
217	TEST_PLATFORM,
218	TEST_DEVICES,
219	TEST_FREEZER,
220	/* keep last */
221	__TEST_AFTER_LAST
222};
223
224#define TEST_FIRST	TEST_NONE
225#define TEST_MAX	(__TEST_AFTER_LAST - 1)
226
227extern int pm_test_level;
228
229#ifdef CONFIG_SUSPEND_FREEZER
230static inline int suspend_freeze_processes(void)
231{
232	int error;
233
234	error = freeze_processes();
235	/*
236	 * freeze_processes() automatically thaws every task if freezing
237	 * fails. So we need not do anything extra upon error.
238	 */
239	if (error)
240		return error;
241
242	error = freeze_kernel_threads();
243	/*
244	 * freeze_kernel_threads() thaws only kernel threads upon freezing
245	 * failure. So we have to thaw the userspace tasks ourselves.
246	 */
247	if (error)
248		thaw_processes();
249
250	return error;
251}
252
253static inline void suspend_thaw_processes(void)
254{
255	thaw_processes();
256}
257#else
258static inline int suspend_freeze_processes(void)
259{
260	return 0;
261}
262
263static inline void suspend_thaw_processes(void)
264{
265}
266#endif
267
268#ifdef CONFIG_PM_AUTOSLEEP
269
270/* kernel/power/autosleep.c */
271extern int pm_autosleep_init(void);
272extern int pm_autosleep_lock(void);
273extern void pm_autosleep_unlock(void);
274extern suspend_state_t pm_autosleep_state(void);
275extern int pm_autosleep_set_state(suspend_state_t state);
276
277#else /* !CONFIG_PM_AUTOSLEEP */
278
279static inline int pm_autosleep_init(void) { return 0; }
280static inline int pm_autosleep_lock(void) { return 0; }
281static inline void pm_autosleep_unlock(void) {}
282static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
283
284#endif /* !CONFIG_PM_AUTOSLEEP */
285
286#ifdef CONFIG_PM_WAKELOCKS
287
288/* kernel/power/wakelock.c */
289extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
290extern int pm_wake_lock(const char *buf);
291extern int pm_wake_unlock(const char *buf);
292
293#endif /* !CONFIG_PM_WAKELOCKS */