/* SPDX-License-Identifier: GPL-2.0 */ #include <linux/suspend.h> #include <linux/suspend_ioctls.h> #include <linux/utsname.h> #include <linux/freezer.h> #include <linux/compiler.h> #include <linux/cpu.h> #include <linux/cpuidle.h> #include <linux/crypto.h> struct swsusp_info { … } __aligned(…); #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 … static inline int init_header_complete(struct swsusp_info *info) { … } static inline const char *check_image_kernel(struct swsusp_info *info) { … } #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 … /* * 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 … asmlinkage int swsusp_save(void); /* kernel/power/hibernate.c */ extern bool freezer_test_done; extern char hib_comp_algo[CRYPTO_MAX_ALG_NAME]; /* kernel/power/swap.c */ extern unsigned int swsusp_header_flags; extern int hibernation_snapshot(int platform_mode); extern int hibernation_restore(int platform_mode); extern int hibernation_platform_enter(void); #ifdef CONFIG_STRICT_KERNEL_RWX /* kernel/power/snapshot.c */ extern void enable_restore_image_protection(void); #else static inline void enable_restore_image_protection(void) {} #endif /* CONFIG_STRICT_KERNEL_RWX */ #else /* !CONFIG_HIBERNATION */ static inline void hibernate_reserved_size_init(void) {} static inline void hibernate_image_size_init(void) {} #endif /* !CONFIG_HIBERNATION */ #define power_attr(_name) … #define power_attr_ro(_name) … /* 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 int create_basic_memory_bitmaps(void); extern void free_basic_memory_bitmaps(void); extern int hibernate_preallocate_memory(void); extern void clear_or_poison_free_pages(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 { … }; /* 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) … 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); int snapshot_write_finalize(struct snapshot_handle *handle); extern int snapshot_image_loaded(struct snapshot_handle *handle); extern bool hibernate_acquire(void); extern void hibernate_release(void); 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_COMPRESSION_ALG_LZO … #define SF_PLATFORM_MODE … #define SF_NOCOMPRESS_MODE … #define SF_CRC32_MODE … #define SF_HW_SIG … /* * Bit to indicate the compression algorithm to be used(for LZ4). The same * could be checked while saving/loading image to/from disk to use the * corresponding algorithms. * * By default, LZO compression is enabled if SF_CRC32_MODE is set. Use * SF_COMPRESSION_ALG_LZ4 to override this behaviour and use LZ4. * * SF_CRC32_MODE, SF_COMPRESSION_ALG_LZO(dummy) -> Compression, LZO * SF_CRC32_MODE, SF_COMPRESSION_ALG_LZ4 -> Compression, LZ4 */ #define SF_COMPRESSION_ALG_LZ4 … /* kernel/power/hibernate.c */ int swsusp_check(bool exclusive); extern void swsusp_free(void); extern int swsusp_read(unsigned int *flags_p); extern int swsusp_write(unsigned int flags); void swsusp_close(void); #ifdef CONFIG_SUSPEND extern int swsusp_unmark(void); #else static inline int swsusp_unmark(void) { return 0; } #endif struct __kernel_old_timeval; /* kernel/power/swsusp.c */ extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *); #ifdef CONFIG_SUSPEND /* kernel/power/suspend.c */ extern const char * const pm_labels[]; extern const char *pm_states[]; extern const char *mem_sleep_states[]; extern int suspend_devices_and_enter(suspend_state_t state); #else /* !CONFIG_SUSPEND */ #define mem_sleep_current … 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_robust(unsigned long val_up, unsigned long val_down); extern int pm_notifier_call_chain(unsigned long val); void pm_restrict_gfp_mask(void); void pm_restore_gfp_mask(void); #else static inline void pm_restrict_gfp_mask(void) {} static inline void pm_restore_gfp_mask(void) {} #endif #ifdef CONFIG_HIGHMEM int restore_highmem(void); #else static inline unsigned int count_highmem_pages(void) { … } static inline int restore_highmem(void) { … } #endif /* * Suspend test levels */ enum { … }; #define TEST_FIRST … #define TEST_MAX … #ifdef CONFIG_PM_SLEEP_DEBUG extern int pm_test_level; #else #define pm_test_level … #endif #ifdef CONFIG_SUSPEND_FREEZER static inline int suspend_freeze_processes(void) { … } static inline void suspend_thaw_processes(void) { … } #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 */ static inline int pm_sleep_disable_secondary_cpus(void) { … } static inline void pm_sleep_enable_secondary_cpus(void) { … } void dpm_save_errno(int err);
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