299 lines
8.3 KiB
C
299 lines
8.3 KiB
C
#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 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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/*
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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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#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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extern int pfn_is_nosave(unsigned long);
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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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/* 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 asmlinkage int swsusp_arch_suspend(void);
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extern asmlinkage int swsusp_arch_resume(void);
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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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/**
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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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/* If unset, the snapshot device cannot be open. */
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extern atomic_t snapshot_device_available;
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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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/* kernel/power/block_io.c */
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extern struct block_device *hib_resume_bdev;
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extern int hib_bio_read_page(pgoff_t page_off, void *addr,
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struct bio **bio_chain);
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extern int hib_bio_write_page(pgoff_t page_off, void *addr,
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struct bio **bio_chain);
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extern int hib_wait_on_bio_chain(struct bio **bio_chain);
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struct timeval;
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/* kernel/power/swsusp.c */
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extern void swsusp_show_speed(struct timeval *, struct timeval *,
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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 *pm_labels[];
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extern const char *pm_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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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(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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extern int pm_test_level;
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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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