| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_MIGRATE_H |
| #define _LINUX_MIGRATE_H |
| |
| #include <linux/mm.h> |
| #include <linux/mempolicy.h> |
| #include <linux/migrate_mode.h> |
| #include <linux/hugetlb.h> |
| |
| typedef struct page *new_page_t(struct page *page, unsigned long private); |
| typedef void free_page_t(struct page *page, unsigned long private); |
| |
| struct migration_target_control; |
| |
| /* |
| * Return values from addresss_space_operations.migratepage(): |
| * - negative errno on page migration failure; |
| * - zero on page migration success; |
| */ |
| #define MIGRATEPAGE_SUCCESS 0 |
| |
| /* Defined in mm/debug.c: */ |
| extern const char *migrate_reason_names[MR_TYPES]; |
| |
| #ifdef CONFIG_MIGRATION |
| |
| extern void putback_movable_pages(struct list_head *l); |
| extern int migrate_page(struct address_space *mapping, |
| struct page *newpage, struct page *page, |
| enum migrate_mode mode); |
| extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, |
| unsigned long private, enum migrate_mode mode, int reason, |
| unsigned int *ret_succeeded); |
| extern struct page *alloc_migration_target(struct page *page, unsigned long private); |
| extern int isolate_movable_page(struct page *page, isolate_mode_t mode); |
| |
| extern void migrate_page_states(struct page *newpage, struct page *page); |
| extern void migrate_page_copy(struct page *newpage, struct page *page); |
| extern int migrate_huge_page_move_mapping(struct address_space *mapping, |
| struct page *newpage, struct page *page); |
| extern int migrate_page_move_mapping(struct address_space *mapping, |
| struct page *newpage, struct page *page, int extra_count); |
| void folio_migrate_flags(struct folio *newfolio, struct folio *folio); |
| void folio_migrate_copy(struct folio *newfolio, struct folio *folio); |
| int folio_migrate_mapping(struct address_space *mapping, |
| struct folio *newfolio, struct folio *folio, int extra_count); |
| |
| extern bool numa_demotion_enabled; |
| #else |
| |
| static inline void putback_movable_pages(struct list_head *l) {} |
| static inline int migrate_pages(struct list_head *l, new_page_t new, |
| free_page_t free, unsigned long private, enum migrate_mode mode, |
| int reason, unsigned int *ret_succeeded) |
| { return -ENOSYS; } |
| static inline struct page *alloc_migration_target(struct page *page, |
| unsigned long private) |
| { return NULL; } |
| static inline int isolate_movable_page(struct page *page, isolate_mode_t mode) |
| { return -EBUSY; } |
| |
| static inline void migrate_page_states(struct page *newpage, struct page *page) |
| { |
| } |
| |
| static inline void migrate_page_copy(struct page *newpage, |
| struct page *page) {} |
| |
| static inline int migrate_huge_page_move_mapping(struct address_space *mapping, |
| struct page *newpage, struct page *page) |
| { |
| return -ENOSYS; |
| } |
| |
| #define numa_demotion_enabled false |
| #endif /* CONFIG_MIGRATION */ |
| |
| #ifdef CONFIG_COMPACTION |
| extern int PageMovable(struct page *page); |
| extern void __SetPageMovable(struct page *page, struct address_space *mapping); |
| extern void __ClearPageMovable(struct page *page); |
| #else |
| static inline int PageMovable(struct page *page) { return 0; } |
| static inline void __SetPageMovable(struct page *page, |
| struct address_space *mapping) |
| { |
| } |
| static inline void __ClearPageMovable(struct page *page) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_NUMA_BALANCING |
| extern int migrate_misplaced_page(struct page *page, |
| struct vm_area_struct *vma, int node); |
| #else |
| static inline int migrate_misplaced_page(struct page *page, |
| struct vm_area_struct *vma, int node) |
| { |
| return -EAGAIN; /* can't migrate now */ |
| } |
| #endif /* CONFIG_NUMA_BALANCING */ |
| |
| #ifdef CONFIG_MIGRATION |
| |
| /* |
| * Watch out for PAE architecture, which has an unsigned long, and might not |
| * have enough bits to store all physical address and flags. So far we have |
| * enough room for all our flags. |
| */ |
| #define MIGRATE_PFN_VALID (1UL << 0) |
| #define MIGRATE_PFN_MIGRATE (1UL << 1) |
| #define MIGRATE_PFN_WRITE (1UL << 3) |
| #define MIGRATE_PFN_SHIFT 6 |
| |
| static inline struct page *migrate_pfn_to_page(unsigned long mpfn) |
| { |
| if (!(mpfn & MIGRATE_PFN_VALID)) |
| return NULL; |
| return pfn_to_page(mpfn >> MIGRATE_PFN_SHIFT); |
| } |
| |
| static inline unsigned long migrate_pfn(unsigned long pfn) |
| { |
| return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID; |
| } |
| |
| enum migrate_vma_direction { |
| MIGRATE_VMA_SELECT_SYSTEM = 1 << 0, |
| MIGRATE_VMA_SELECT_DEVICE_PRIVATE = 1 << 1, |
| }; |
| |
| struct migrate_vma { |
| struct vm_area_struct *vma; |
| /* |
| * Both src and dst array must be big enough for |
| * (end - start) >> PAGE_SHIFT entries. |
| * |
| * The src array must not be modified by the caller after |
| * migrate_vma_setup(), and must not change the dst array after |
| * migrate_vma_pages() returns. |
| */ |
| unsigned long *dst; |
| unsigned long *src; |
| unsigned long cpages; |
| unsigned long npages; |
| unsigned long start; |
| unsigned long end; |
| |
| /* |
| * Set to the owner value also stored in page->pgmap->owner for |
| * migrating out of device private memory. The flags also need to |
| * be set to MIGRATE_VMA_SELECT_DEVICE_PRIVATE. |
| * The caller should always set this field when using mmu notifier |
| * callbacks to avoid device MMU invalidations for device private |
| * pages that are not being migrated. |
| */ |
| void *pgmap_owner; |
| unsigned long flags; |
| }; |
| |
| int migrate_vma_setup(struct migrate_vma *args); |
| void migrate_vma_pages(struct migrate_vma *migrate); |
| void migrate_vma_finalize(struct migrate_vma *migrate); |
| int next_demotion_node(int node); |
| |
| #else /* CONFIG_MIGRATION disabled: */ |
| |
| static inline int next_demotion_node(int node) |
| { |
| return NUMA_NO_NODE; |
| } |
| |
| #endif /* CONFIG_MIGRATION */ |
| |
| #endif /* _LINUX_MIGRATE_H */ |