#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 /* * 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); extern struct mutex pm_mutex; #define power_attr(_name) \ static struct subsys_attribute _name##_attr = { \ .attr = { \ .name = __stringify(_name), \ .mode = 0644, \ }, \ .show = _name##_show, \ .store = _name##_store, \ } extern struct kset power_subsys; /* 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 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); /* * This structure is used to pass the values needed for the identification * of the resume swap area from a user space to the kernel via the * SNAPSHOT_SET_SWAP_AREA ioctl */ struct resume_swap_area { loff_t offset; u_int32_t dev; } __attribute__((packed)); #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_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int) #define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \ struct resume_swap_area) #define SNAPSHOT_IOC_MAXNR 13 #define PMOPS_PREPARE 1 #define PMOPS_ENTER 2 #define PMOPS_FINISH 3 /* 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_suspend(void); extern int swsusp_resume(void); extern int swsusp_read(unsigned int *flags_p); extern int swsusp_write(unsigned int flags); extern void swsusp_close(void); struct timeval; /* kernel/power/swsusp.c */ extern void swsusp_show_speed(struct timeval *, struct timeval *, unsigned int, char *); /* kernel/power/main.c */ extern int suspend_enter(suspend_state_t state); extern int suspend_devices_and_enter(suspend_state_t state); extern struct blocking_notifier_head pm_chain_head; static inline int pm_notifier_call_chain(unsigned long val) { return (blocking_notifier_call_chain(&pm_chain_head, val, NULL) == NOTIFY_BAD) ? -EINVAL : 0; }