diff options
Diffstat (limited to 'kernel/power/power.h')
-rw-r--r-- | kernel/power/power.h | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h new file mode 100644 index 0000000..46b5ec7 --- /dev/null +++ b/kernel/power/power.h @@ -0,0 +1,225 @@ +#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 +#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/disk.c */ +extern int hibernation_snapshot(int platform_mode); +extern int hibernation_restore(int platform_mode); +extern int hibernation_platform_enter(void); +#endif + +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; +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 unsigned int count_data_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 { + loff_t offset; /* number of the last byte ready for reading + * or writing in the sequence + */ + unsigned int cur; /* number of the block of PAGE_SIZE bytes the + * next operation will refer to (ie. current) + */ + unsigned int cur_offset; /* offset with respect to the current + * block (for the next operation) + */ + unsigned int prev; /* number of the block of PAGE_SIZE bytes that + * was the current one previously + */ + void *buffer; /* address of the block to read from + * or write to + */ + unsigned int buf_offset; /* location to read from or write to, + * given as a displacement from 'buffer' + */ + 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 + (handle).buf_offset) + +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, size_t count); +extern int snapshot_write_next(struct snapshot_handle *handle, size_t count); +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 + +/* kernel/power/disk.c */ +extern int swsusp_check(void); +extern int swsusp_shrink_memory(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); + +struct timeval; +/* kernel/power/swsusp.c */ +extern void swsusp_show_speed(struct timeval *, struct timeval *, + unsigned int, char *); + +#ifdef CONFIG_SUSPEND +/* kernel/power/main.c */ +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_SLEEP +/* kernel/power/main.c */ +extern int pm_notifier_call_chain(unsigned long val); +#endif + +#ifdef CONFIG_HIGHMEM +unsigned int count_highmem_pages(void); +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) +{ + return freeze_processes(); +} + +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 |