| #include <linux/suspend.h> |
| #include <linux/suspend_ioctls.h> |
| #include <linux/utsname.h> |
| #include <linux/freezer.h> |
| #include <linux/compiler.h> |
| |
| struct swsusp_info { |
| struct new_utsname uts; |
| u32 version_code; |
| unsigned long num_physpages; |
| int cpus; |
| unsigned long image_pages; |
| unsigned long pages; |
| unsigned long size; |
| } __aligned(PAGE_SIZE); |
| |
| #ifdef CONFIG_HIBERNATION |
| /* kernel/power/snapshot.c */ |
| extern void __init hibernate_reserved_size_init(void); |
| extern void __init hibernate_image_size_init(void); |
| |
| #ifdef CONFIG_ARCH_HIBERNATION_HEADER |
| /* Maximum size of architecture specific data in a hibernation header */ |
| #define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4) |
| |
| extern int arch_hibernation_header_save(void *addr, unsigned int max_size); |
| extern int arch_hibernation_header_restore(void *addr); |
| |
| static inline int init_header_complete(struct swsusp_info *info) |
| { |
| return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE); |
| } |
| |
| static inline char *check_image_kernel(struct swsusp_info *info) |
| { |
| return arch_hibernation_header_restore(info) ? |
| "architecture specific data" : NULL; |
| } |
| #endif /* CONFIG_ARCH_HIBERNATION_HEADER */ |
| |
| /* |
| * Keep some memory free so that I/O operations can succeed without paging |
| * [Might this be more than 4 MB?] |
| */ |
| #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT) |
| |
| /* |
| * Keep 1 MB of memory free so that device drivers can allocate some pages in |
| * their .suspend() routines without breaking the suspend to disk. |
| */ |
| #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT) |
| |
| asmlinkage int swsusp_save(void); |
| |
| /* kernel/power/hibernate.c */ |
| extern bool freezer_test_done; |
| |
| extern int hibernation_snapshot(int platform_mode); |
| extern int hibernation_restore(int platform_mode); |
| extern int hibernation_platform_enter(void); |
| |
| #else /* !CONFIG_HIBERNATION */ |
| |
| static inline void hibernate_reserved_size_init(void) {} |
| static inline void hibernate_image_size_init(void) {} |
| #endif /* !CONFIG_HIBERNATION */ |
| |
| extern int pfn_is_nosave(unsigned long); |
| |
| #define power_attr(_name) \ |
| static struct kobj_attribute _name##_attr = { \ |
| .attr = { \ |
| .name = __stringify(_name), \ |
| .mode = 0644, \ |
| }, \ |
| .show = _name##_show, \ |
| .store = _name##_store, \ |
| } |
| |
| /* Preferred image size in bytes (default 500 MB) */ |
| extern unsigned long image_size; |
| /* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */ |
| extern unsigned long reserved_size; |
| extern int in_suspend; |
| extern dev_t swsusp_resume_device; |
| extern sector_t swsusp_resume_block; |
| |
| extern asmlinkage int swsusp_arch_suspend(void); |
| extern asmlinkage int swsusp_arch_resume(void); |
| |
| extern int create_basic_memory_bitmaps(void); |
| extern void free_basic_memory_bitmaps(void); |
| extern int hibernate_preallocate_memory(void); |
| |
| /** |
| * Auxiliary structure used for reading the snapshot image data and |
| * metadata from and writing them to the list of page backup entries |
| * (PBEs) which is the main data structure of swsusp. |
| * |
| * Using struct snapshot_handle we can transfer the image, including its |
| * metadata, as a continuous sequence of bytes with the help of |
| * snapshot_read_next() and snapshot_write_next(). |
| * |
| * The code that writes the image to a storage or transfers it to |
| * the user land is required to use snapshot_read_next() for this |
| * purpose and it should not make any assumptions regarding the internal |
| * structure of the image. Similarly, the code that reads the image from |
| * a storage or transfers it from the user land is required to use |
| * snapshot_write_next(). |
| * |
| * This may allow us to change the internal structure of the image |
| * in the future with considerably less effort. |
| */ |
| |
| struct snapshot_handle { |
| unsigned int cur; /* number of the block of PAGE_SIZE bytes the |
| * next operation will refer to (ie. current) |
| */ |
| void *buffer; /* address of the block to read from |
| * or write to |
| */ |
| int sync_read; /* Set to one to notify the caller of |
| * snapshot_write_next() that it may |
| * need to call wait_on_bio_chain() |
| */ |
| }; |
| |
| /* This macro returns the address from/to which the caller of |
| * snapshot_read_next()/snapshot_write_next() is allowed to |
| * read/write data after the function returns |
| */ |
| #define data_of(handle) ((handle).buffer) |
| |
| extern unsigned int snapshot_additional_pages(struct zone *zone); |
| extern unsigned long snapshot_get_image_size(void); |
| extern int snapshot_read_next(struct snapshot_handle *handle); |
| extern int snapshot_write_next(struct snapshot_handle *handle); |
| extern void snapshot_write_finalize(struct snapshot_handle *handle); |
| extern int snapshot_image_loaded(struct snapshot_handle *handle); |
| |
| /* If unset, the snapshot device cannot be open. */ |
| extern atomic_t snapshot_device_available; |
| |
| extern sector_t alloc_swapdev_block(int swap); |
| extern void free_all_swap_pages(int swap); |
| extern int swsusp_swap_in_use(void); |
| |
| /* |
| * Flags that can be passed from the hibernatig hernel to the "boot" kernel in |
| * the image header. |
| */ |
| #define SF_PLATFORM_MODE 1 |
| #define SF_NOCOMPRESS_MODE 2 |
| #define SF_CRC32_MODE 4 |
| |
| /* kernel/power/hibernate.c */ |
| extern int swsusp_check(void); |
| extern void swsusp_free(void); |
| extern int swsusp_read(unsigned int *flags_p); |
| extern int swsusp_write(unsigned int flags); |
| extern void swsusp_close(fmode_t); |
| #ifdef CONFIG_SUSPEND |
| extern int swsusp_unmark(void); |
| #endif |
| |
| /* kernel/power/block_io.c */ |
| extern struct block_device *hib_resume_bdev; |
| |
| extern int hib_bio_read_page(pgoff_t page_off, void *addr, |
| struct bio **bio_chain); |
| extern int hib_bio_write_page(pgoff_t page_off, void *addr, |
| struct bio **bio_chain); |
| extern int hib_wait_on_bio_chain(struct bio **bio_chain); |
| |
| struct timeval; |
| /* kernel/power/swsusp.c */ |
| extern void swsusp_show_speed(struct timeval *, struct timeval *, |
| unsigned int, char *); |
| |
| #ifdef CONFIG_SUSPEND |
| struct pm_sleep_state { |
| const char *label; |
| suspend_state_t state; |
| }; |
| |
| /* kernel/power/suspend.c */ |
| extern struct pm_sleep_state pm_states[]; |
| |
| extern int suspend_devices_and_enter(suspend_state_t state); |
| #else /* !CONFIG_SUSPEND */ |
| static inline int suspend_devices_and_enter(suspend_state_t state) |
| { |
| return -ENOSYS; |
| } |
| #endif /* !CONFIG_SUSPEND */ |
| |
| #ifdef CONFIG_PM_TEST_SUSPEND |
| /* kernel/power/suspend_test.c */ |
| extern void suspend_test_start(void); |
| extern void suspend_test_finish(const char *label); |
| #else /* !CONFIG_PM_TEST_SUSPEND */ |
| static inline void suspend_test_start(void) {} |
| static inline void suspend_test_finish(const char *label) {} |
| #endif /* !CONFIG_PM_TEST_SUSPEND */ |
| |
| #ifdef CONFIG_PM_SLEEP |
| /* kernel/power/main.c */ |
| extern int pm_notifier_call_chain(unsigned long val); |
| #endif |
| |
| #ifdef CONFIG_HIGHMEM |
| int restore_highmem(void); |
| #else |
| static inline unsigned int count_highmem_pages(void) { return 0; } |
| static inline int restore_highmem(void) { return 0; } |
| #endif |
| |
| /* |
| * Suspend test levels |
| */ |
| enum { |
| /* keep first */ |
| TEST_NONE, |
| TEST_CORE, |
| TEST_CPUS, |
| TEST_PLATFORM, |
| TEST_DEVICES, |
| TEST_FREEZER, |
| /* keep last */ |
| __TEST_AFTER_LAST |
| }; |
| |
| #define TEST_FIRST TEST_NONE |
| #define TEST_MAX (__TEST_AFTER_LAST - 1) |
| |
| extern int pm_test_level; |
| |
| #ifdef CONFIG_SUSPEND_FREEZER |
| static inline int suspend_freeze_processes(void) |
| { |
| int error; |
| |
| error = freeze_processes(); |
| /* |
| * freeze_processes() automatically thaws every task if freezing |
| * fails. So we need not do anything extra upon error. |
| */ |
| if (error) |
| return error; |
| |
| error = freeze_kernel_threads(); |
| /* |
| * freeze_kernel_threads() thaws only kernel threads upon freezing |
| * failure. So we have to thaw the userspace tasks ourselves. |
| */ |
| if (error) |
| thaw_processes(); |
| |
| return error; |
| } |
| |
| static inline void suspend_thaw_processes(void) |
| { |
| thaw_processes(); |
| } |
| #else |
| static inline int suspend_freeze_processes(void) |
| { |
| return 0; |
| } |
| |
| static inline void suspend_thaw_processes(void) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_PM_AUTOSLEEP |
| |
| /* kernel/power/autosleep.c */ |
| extern int pm_autosleep_init(void); |
| extern int pm_autosleep_lock(void); |
| extern void pm_autosleep_unlock(void); |
| extern suspend_state_t pm_autosleep_state(void); |
| extern int pm_autosleep_set_state(suspend_state_t state); |
| |
| #else /* !CONFIG_PM_AUTOSLEEP */ |
| |
| static inline int pm_autosleep_init(void) { return 0; } |
| static inline int pm_autosleep_lock(void) { return 0; } |
| static inline void pm_autosleep_unlock(void) {} |
| static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; } |
| |
| #endif /* !CONFIG_PM_AUTOSLEEP */ |
| |
| #ifdef CONFIG_PM_WAKELOCKS |
| |
| /* kernel/power/wakelock.c */ |
| extern ssize_t pm_show_wakelocks(char *buf, bool show_active); |
| extern int pm_wake_lock(const char *buf); |
| extern int pm_wake_unlock(const char *buf); |
| |
| #endif /* !CONFIG_PM_WAKELOCKS */ |