#include <linux/suspend.h> #include <linux/suspend_ioctls.h> #include <linux/utsname.h> #include <linux/freezer.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; } __attribute__((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) /* 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); /* 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 /* kernel/power/suspend.c */ extern const char *const pm_states[]; extern bool valid_state(suspend_state_t state); extern int suspend_devices_and_enter(suspend_state_t state); extern int enter_state(suspend_state_t state); #else /* !CONFIG_SUSPEND */ static inline int suspend_devices_and_enter(suspend_state_t state) { return -ENOSYS; } static inline int enter_state(suspend_state_t state) { return -ENOSYS; } static inline bool valid_state(suspend_state_t state) { return false; } #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) goto Finish; 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(); Finish: 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