#include #include 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_SOFTWARE_SUSPEND extern int pm_suspend_disk(void); #else static inline int pm_suspend_disk(void) { return -EPERM; } #endif extern struct semaphore pm_sem; #define power_attr(_name) \ static struct subsys_attribute _name##_attr = { \ .attr = { \ .name = __stringify(_name), \ .mode = 0644, \ }, \ .show = _name##_show, \ .store = _name##_store, \ } extern struct subsystem power_subsys; /* References to section boundaries */ extern const void __nosave_begin, __nosave_end; /* Preferred image size in bytes (default 500 MB) */ extern unsigned long image_size; extern int in_suspend; extern dev_t swsusp_resume_device; extern asmlinkage int swsusp_arch_suspend(void); extern asmlinkage int swsusp_arch_resume(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 */ struct pbe *pbe; /* PBE that corresponds to 'buffer' */ struct pbe *last_pbe; /* When the image is restored (eg. read * from disk) we can store some image * data directly in the page frames * in which they were before suspend. * In such a case the PBEs that * correspond to them will be unused. * This is the last PBE, so far, that * does not correspond to such data. */ 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 int snapshot_read_next(struct snapshot_handle *handle, size_t count); extern int snapshot_write_next(struct snapshot_handle *handle, size_t count); extern int snapshot_image_loaded(struct snapshot_handle *handle); #define SNAPSHOT_IOC_MAGIC '3' #define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1) #define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2) #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *) #define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4) #define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5) #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long) #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *) #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *) #define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9) #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int) #define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11) #define SNAPSHOT_IOC_MAXNR 11 /** * The bitmap is used for tracing allocated swap pages * * The entire bitmap consists of a number of bitmap_page * structures linked with the help of the .next member. * Thus each page can be allocated individually, so we only * need to make 0-order memory allocations to create * the bitmap. */ #define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *)) #define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long)) #define BITS_PER_CHUNK (sizeof(long) * 8) #define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK) struct bitmap_page { unsigned long chunks[BITMAP_PAGE_CHUNKS]; struct bitmap_page *next; }; extern void free_bitmap(struct bitmap_page *bitmap); extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits); extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap); extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap); extern int swsusp_check(void); extern int swsusp_shrink_memory(void); extern void swsusp_free(void); extern int swsusp_suspend(void); extern int swsusp_resume(void); extern int swsusp_read(void); extern int swsusp_write(void); extern void swsusp_close(void); extern int suspend_enter(suspend_state_t state);