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312 lines
8.6 KiB
312 lines
8.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#include <linux/suspend.h> |
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#include <linux/suspend_ioctls.h> |
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#include <linux/utsname.h> |
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#include <linux/freezer.h> |
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#include <linux/compiler.h> |
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struct swsusp_info { |
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struct new_utsname uts; |
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u32 version_code; |
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unsigned long num_physpages; |
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int cpus; |
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unsigned long image_pages; |
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unsigned long pages; |
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unsigned long size; |
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} __aligned(PAGE_SIZE); |
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#ifdef CONFIG_HIBERNATION |
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/* kernel/power/snapshot.c */ |
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extern void __init hibernate_reserved_size_init(void); |
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extern void __init hibernate_image_size_init(void); |
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#ifdef CONFIG_ARCH_HIBERNATION_HEADER |
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/* Maximum size of architecture specific data in a hibernation header */ |
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#define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4) |
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extern int arch_hibernation_header_save(void *addr, unsigned int max_size); |
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extern int arch_hibernation_header_restore(void *addr); |
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static inline int init_header_complete(struct swsusp_info *info) |
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{ |
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return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE); |
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} |
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static inline const char *check_image_kernel(struct swsusp_info *info) |
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{ |
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return arch_hibernation_header_restore(info) ? |
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"architecture specific data" : NULL; |
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} |
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#endif /* CONFIG_ARCH_HIBERNATION_HEADER */ |
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extern int hibernate_resume_nonboot_cpu_disable(void); |
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/* |
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* Keep some memory free so that I/O operations can succeed without paging |
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* [Might this be more than 4 MB?] |
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*/ |
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#define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT) |
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/* |
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* Keep 1 MB of memory free so that device drivers can allocate some pages in |
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* their .suspend() routines without breaking the suspend to disk. |
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*/ |
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#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT) |
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asmlinkage int swsusp_save(void); |
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/* kernel/power/hibernate.c */ |
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extern bool freezer_test_done; |
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extern int hibernation_snapshot(int platform_mode); |
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extern int hibernation_restore(int platform_mode); |
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extern int hibernation_platform_enter(void); |
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#ifdef CONFIG_STRICT_KERNEL_RWX |
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/* kernel/power/snapshot.c */ |
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extern void enable_restore_image_protection(void); |
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#else |
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static inline void enable_restore_image_protection(void) {} |
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#endif /* CONFIG_STRICT_KERNEL_RWX */ |
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#else /* !CONFIG_HIBERNATION */ |
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static inline void hibernate_reserved_size_init(void) {} |
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static inline void hibernate_image_size_init(void) {} |
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#endif /* !CONFIG_HIBERNATION */ |
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#define power_attr(_name) \ |
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static struct kobj_attribute _name##_attr = { \ |
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.attr = { \ |
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.name = __stringify(_name), \ |
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.mode = 0644, \ |
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}, \ |
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.show = _name##_show, \ |
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.store = _name##_store, \ |
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} |
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#define power_attr_ro(_name) \ |
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static struct kobj_attribute _name##_attr = { \ |
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.attr = { \ |
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.name = __stringify(_name), \ |
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.mode = S_IRUGO, \ |
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}, \ |
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.show = _name##_show, \ |
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} |
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/* Preferred image size in bytes (default 500 MB) */ |
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extern unsigned long image_size; |
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/* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */ |
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extern unsigned long reserved_size; |
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extern int in_suspend; |
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extern dev_t swsusp_resume_device; |
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extern sector_t swsusp_resume_block; |
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extern int create_basic_memory_bitmaps(void); |
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extern void free_basic_memory_bitmaps(void); |
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extern int hibernate_preallocate_memory(void); |
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extern void clear_or_poison_free_pages(void); |
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/** |
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* Auxiliary structure used for reading the snapshot image data and |
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* metadata from and writing them to the list of page backup entries |
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* (PBEs) which is the main data structure of swsusp. |
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* |
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* Using struct snapshot_handle we can transfer the image, including its |
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* metadata, as a continuous sequence of bytes with the help of |
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* snapshot_read_next() and snapshot_write_next(). |
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* |
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* The code that writes the image to a storage or transfers it to |
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* the user land is required to use snapshot_read_next() for this |
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* purpose and it should not make any assumptions regarding the internal |
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* structure of the image. Similarly, the code that reads the image from |
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* a storage or transfers it from the user land is required to use |
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* snapshot_write_next(). |
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* |
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* This may allow us to change the internal structure of the image |
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* in the future with considerably less effort. |
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*/ |
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struct snapshot_handle { |
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unsigned int cur; /* number of the block of PAGE_SIZE bytes the |
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* next operation will refer to (ie. current) |
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*/ |
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void *buffer; /* address of the block to read from |
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* or write to |
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*/ |
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int sync_read; /* Set to one to notify the caller of |
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* snapshot_write_next() that it may |
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* need to call wait_on_bio_chain() |
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*/ |
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}; |
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/* This macro returns the address from/to which the caller of |
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* snapshot_read_next()/snapshot_write_next() is allowed to |
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* read/write data after the function returns |
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*/ |
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#define data_of(handle) ((handle).buffer) |
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extern unsigned int snapshot_additional_pages(struct zone *zone); |
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extern unsigned long snapshot_get_image_size(void); |
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extern int snapshot_read_next(struct snapshot_handle *handle); |
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extern int snapshot_write_next(struct snapshot_handle *handle); |
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extern void snapshot_write_finalize(struct snapshot_handle *handle); |
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extern int snapshot_image_loaded(struct snapshot_handle *handle); |
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extern bool hibernate_acquire(void); |
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extern void hibernate_release(void); |
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extern sector_t alloc_swapdev_block(int swap); |
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extern void free_all_swap_pages(int swap); |
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extern int swsusp_swap_in_use(void); |
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/* |
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* Flags that can be passed from the hibernatig hernel to the "boot" kernel in |
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* the image header. |
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*/ |
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#define SF_PLATFORM_MODE 1 |
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#define SF_NOCOMPRESS_MODE 2 |
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#define SF_CRC32_MODE 4 |
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/* kernel/power/hibernate.c */ |
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extern int swsusp_check(void); |
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extern void swsusp_free(void); |
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extern int swsusp_read(unsigned int *flags_p); |
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extern int swsusp_write(unsigned int flags); |
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extern void swsusp_close(fmode_t); |
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#ifdef CONFIG_SUSPEND |
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extern int swsusp_unmark(void); |
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#endif |
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struct __kernel_old_timeval; |
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/* kernel/power/swsusp.c */ |
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extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *); |
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#ifdef CONFIG_SUSPEND |
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/* kernel/power/suspend.c */ |
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extern const char * const pm_labels[]; |
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extern const char *pm_states[]; |
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extern const char *mem_sleep_states[]; |
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extern int suspend_devices_and_enter(suspend_state_t state); |
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#else /* !CONFIG_SUSPEND */ |
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#define mem_sleep_current PM_SUSPEND_ON |
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static inline int suspend_devices_and_enter(suspend_state_t state) |
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{ |
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return -ENOSYS; |
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} |
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#endif /* !CONFIG_SUSPEND */ |
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#ifdef CONFIG_PM_TEST_SUSPEND |
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/* kernel/power/suspend_test.c */ |
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extern void suspend_test_start(void); |
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extern void suspend_test_finish(const char *label); |
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#else /* !CONFIG_PM_TEST_SUSPEND */ |
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static inline void suspend_test_start(void) {} |
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static inline void suspend_test_finish(const char *label) {} |
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#endif /* !CONFIG_PM_TEST_SUSPEND */ |
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#ifdef CONFIG_PM_SLEEP |
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/* kernel/power/main.c */ |
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extern int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down); |
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extern int pm_notifier_call_chain(unsigned long val); |
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#endif |
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#ifdef CONFIG_HIGHMEM |
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int restore_highmem(void); |
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#else |
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static inline unsigned int count_highmem_pages(void) { return 0; } |
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static inline int restore_highmem(void) { return 0; } |
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#endif |
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/* |
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* Suspend test levels |
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*/ |
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enum { |
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/* keep first */ |
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TEST_NONE, |
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TEST_CORE, |
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TEST_CPUS, |
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TEST_PLATFORM, |
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TEST_DEVICES, |
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TEST_FREEZER, |
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/* keep last */ |
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__TEST_AFTER_LAST |
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}; |
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#define TEST_FIRST TEST_NONE |
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#define TEST_MAX (__TEST_AFTER_LAST - 1) |
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#ifdef CONFIG_PM_SLEEP_DEBUG |
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extern int pm_test_level; |
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#else |
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#define pm_test_level (TEST_NONE) |
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#endif |
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#ifdef CONFIG_SUSPEND_FREEZER |
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static inline int suspend_freeze_processes(void) |
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{ |
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int error; |
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error = freeze_processes(); |
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/* |
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* freeze_processes() automatically thaws every task if freezing |
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* fails. So we need not do anything extra upon error. |
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*/ |
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if (error) |
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return error; |
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error = freeze_kernel_threads(); |
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/* |
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* freeze_kernel_threads() thaws only kernel threads upon freezing |
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* failure. So we have to thaw the userspace tasks ourselves. |
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*/ |
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if (error) |
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thaw_processes(); |
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return error; |
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} |
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static inline void suspend_thaw_processes(void) |
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{ |
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thaw_processes(); |
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} |
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#else |
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static inline int suspend_freeze_processes(void) |
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{ |
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return 0; |
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} |
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static inline void suspend_thaw_processes(void) |
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{ |
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} |
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#endif |
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#ifdef CONFIG_PM_AUTOSLEEP |
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/* kernel/power/autosleep.c */ |
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extern int pm_autosleep_init(void); |
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extern int pm_autosleep_lock(void); |
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extern void pm_autosleep_unlock(void); |
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extern suspend_state_t pm_autosleep_state(void); |
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extern int pm_autosleep_set_state(suspend_state_t state); |
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#else /* !CONFIG_PM_AUTOSLEEP */ |
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static inline int pm_autosleep_init(void) { return 0; } |
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static inline int pm_autosleep_lock(void) { return 0; } |
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static inline void pm_autosleep_unlock(void) {} |
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static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; } |
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#endif /* !CONFIG_PM_AUTOSLEEP */ |
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#ifdef CONFIG_PM_WAKELOCKS |
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/* kernel/power/wakelock.c */ |
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extern ssize_t pm_show_wakelocks(char *buf, bool show_active); |
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extern int pm_wake_lock(const char *buf); |
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extern int pm_wake_unlock(const char *buf); |
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#endif /* !CONFIG_PM_WAKELOCKS */
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