226 lines
6.4 KiB
C
226 lines
6.4 KiB
C
#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(void);
|
|
|
|
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
|