diff options
Diffstat (limited to 'kernel/power/power.h')
| -rw-r--r-- | kernel/power/power.h | 49 |
1 files changed, 21 insertions, 28 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h index eb461b816bf4..34b43542785a 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -14,8 +14,18 @@ struct swsusp_info { #ifdef CONFIG_SOFTWARE_SUSPEND -extern int pm_suspend_disk(void); +/* + * 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) +extern int pm_suspend_disk(void); #else static inline int pm_suspend_disk(void) { @@ -23,6 +33,8 @@ static inline int pm_suspend_disk(void) } #endif +extern int pfn_is_nosave(unsigned long); + extern struct mutex pm_mutex; #define power_attr(_name) \ @@ -35,10 +47,7 @@ static struct subsys_attribute _name##_attr = { \ .store = _name##_store, \ } -extern struct subsystem power_subsys; - -/* References to section boundaries */ -extern const void __nosave_begin, __nosave_end; +extern struct kset power_subsys; /* Preferred image size in bytes (default 500 MB) */ extern unsigned long image_size; @@ -49,6 +58,8 @@ 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); /** @@ -139,30 +150,12 @@ struct resume_swap_area { #define PMOPS_ENTER 2 #define PMOPS_FINISH 3 -/** - * 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; -}; +/* If unset, the snapshot device cannot be open. */ +extern atomic_t snapshot_device_available; -extern void free_bitmap(struct bitmap_page *bitmap); -extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits); -extern sector_t alloc_swapdev_block(int swap, struct bitmap_page *bitmap); -extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap); +extern sector_t alloc_swapdev_block(int swap); +extern void free_all_swap_pages(int swap); +extern int swsusp_swap_in_use(void); extern int swsusp_check(void); extern int swsusp_shrink_memory(void); |