Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
b20a3503 CL |
2 | #ifndef _LINUX_MIGRATE_H |
3 | #define _LINUX_MIGRATE_H | |
4 | ||
b20a3503 | 5 | #include <linux/mm.h> |
906e0be1 | 6 | #include <linux/mempolicy.h> |
6536e312 | 7 | #include <linux/migrate_mode.h> |
8b913238 | 8 | #include <linux/hugetlb.h> |
b20a3503 | 9 | |
666feb21 | 10 | typedef struct page *new_page_t(struct page *page, unsigned long private); |
68711a74 | 11 | typedef void free_page_t(struct page *page, unsigned long private); |
95a402c3 | 12 | |
19fc7bed JK |
13 | struct migration_target_control; |
14 | ||
78bd5209 RA |
15 | /* |
16 | * Return values from addresss_space_operations.migratepage(): | |
17 | * - negative errno on page migration failure; | |
18 | * - zero on page migration success; | |
19 | */ | |
20 | #define MIGRATEPAGE_SUCCESS 0 | |
d6d86c0a | 21 | |
8eb42bea | 22 | /* Defined in mm/debug.c: */ |
9a2f45ff | 23 | extern const char *migrate_reason_names[MR_TYPES]; |
7cd12b4a | 24 | |
906e0be1 | 25 | #ifdef CONFIG_MIGRATION |
64cdd548 | 26 | |
5733c7d1 | 27 | extern void putback_movable_pages(struct list_head *l); |
9927e388 PJ |
28 | extern int migrate_page(struct address_space *mapping, |
29 | struct page *newpage, struct page *page, | |
30 | enum migrate_mode mode); | |
68711a74 | 31 | extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, |
5ac95884 YS |
32 | unsigned long private, enum migrate_mode mode, int reason, |
33 | unsigned int *ret_succeeded); | |
19fc7bed | 34 | extern struct page *alloc_migration_target(struct page *page, unsigned long private); |
9e5bcd61 | 35 | extern int isolate_movable_page(struct page *page, isolate_mode_t mode); |
95a402c3 | 36 | |
2916ecc0 | 37 | extern void migrate_page_states(struct page *newpage, struct page *page); |
290408d4 NH |
38 | extern void migrate_page_copy(struct page *newpage, struct page *page); |
39 | extern int migrate_huge_page_move_mapping(struct address_space *mapping, | |
40 | struct page *newpage, struct page *page); | |
36bc08cc | 41 | extern int migrate_page_move_mapping(struct address_space *mapping, |
37109694 | 42 | struct page *newpage, struct page *page, int extra_count); |
ffa65753 AP |
43 | void migration_entry_wait_on_locked(swp_entry_t entry, pte_t *ptep, |
44 | spinlock_t *ptl); | |
19138349 | 45 | void folio_migrate_flags(struct folio *newfolio, struct folio *folio); |
715cbfd6 | 46 | void folio_migrate_copy(struct folio *newfolio, struct folio *folio); |
3417013e MWO |
47 | int folio_migrate_mapping(struct address_space *mapping, |
48 | struct folio *newfolio, struct folio *folio, int extra_count); | |
20f9ba4f | 49 | |
734c1570 OS |
50 | #else |
51 | ||
5733c7d1 | 52 | static inline void putback_movable_pages(struct list_head *l) {} |
68711a74 DR |
53 | static inline int migrate_pages(struct list_head *l, new_page_t new, |
54 | free_page_t free, unsigned long private, enum migrate_mode mode, | |
5ac95884 | 55 | int reason, unsigned int *ret_succeeded) |
9c620e2b | 56 | { return -ENOSYS; } |
19fc7bed JK |
57 | static inline struct page *alloc_migration_target(struct page *page, |
58 | unsigned long private) | |
b4b38223 | 59 | { return NULL; } |
cbae0170 YX |
60 | static inline int isolate_movable_page(struct page *page, isolate_mode_t mode) |
61 | { return -EBUSY; } | |
9bf9e89c | 62 | |
2916ecc0 JG |
63 | static inline void migrate_page_states(struct page *newpage, struct page *page) |
64 | { | |
65 | } | |
66 | ||
290408d4 NH |
67 | static inline void migrate_page_copy(struct page *newpage, |
68 | struct page *page) {} | |
69 | ||
6f39ce05 | 70 | static inline int migrate_huge_page_move_mapping(struct address_space *mapping, |
290408d4 NH |
71 | struct page *newpage, struct page *page) |
72 | { | |
73 | return -ENOSYS; | |
74 | } | |
20f9ba4f | 75 | |
b20a3503 | 76 | #endif /* CONFIG_MIGRATION */ |
7039e1db | 77 | |
7d6e2d96 OS |
78 | #if defined(CONFIG_MIGRATION) && defined(CONFIG_NUMA) |
79 | extern void set_migration_target_nodes(void); | |
80 | extern void migrate_on_reclaim_init(void); | |
81 | extern bool numa_demotion_enabled; | |
82 | extern int next_demotion_node(int node); | |
83 | #else | |
84 | static inline void set_migration_target_nodes(void) {} | |
85 | static inline void migrate_on_reclaim_init(void) {} | |
86 | static inline int next_demotion_node(int node) | |
87 | { | |
88 | return NUMA_NO_NODE; | |
89 | } | |
90 | #define numa_demotion_enabled false | |
91 | #endif | |
92 | ||
dd4123f3 MK |
93 | #ifdef CONFIG_COMPACTION |
94 | extern int PageMovable(struct page *page); | |
95 | extern void __SetPageMovable(struct page *page, struct address_space *mapping); | |
96 | extern void __ClearPageMovable(struct page *page); | |
97 | #else | |
a553e3cd | 98 | static inline int PageMovable(struct page *page) { return 0; } |
dd4123f3 MK |
99 | static inline void __SetPageMovable(struct page *page, |
100 | struct address_space *mapping) | |
101 | { | |
102 | } | |
103 | static inline void __ClearPageMovable(struct page *page) | |
104 | { | |
105 | } | |
106 | #endif | |
107 | ||
8b463be3 MWO |
108 | static inline bool folio_test_movable(struct folio *folio) |
109 | { | |
110 | return PageMovable(&folio->page); | |
111 | } | |
112 | ||
7039e1db | 113 | #ifdef CONFIG_NUMA_BALANCING |
1bc115d8 MG |
114 | extern int migrate_misplaced_page(struct page *page, |
115 | struct vm_area_struct *vma, int node); | |
7039e1db | 116 | #else |
1bc115d8 MG |
117 | static inline int migrate_misplaced_page(struct page *page, |
118 | struct vm_area_struct *vma, int node) | |
7039e1db PZ |
119 | { |
120 | return -EAGAIN; /* can't migrate now */ | |
121 | } | |
220018d3 | 122 | #endif /* CONFIG_NUMA_BALANCING */ |
b32967ff | 123 | |
8763cb45 JG |
124 | #ifdef CONFIG_MIGRATION |
125 | ||
a5430dda JG |
126 | /* |
127 | * Watch out for PAE architecture, which has an unsigned long, and might not | |
128 | * have enough bits to store all physical address and flags. So far we have | |
129 | * enough room for all our flags. | |
130 | */ | |
8763cb45 JG |
131 | #define MIGRATE_PFN_VALID (1UL << 0) |
132 | #define MIGRATE_PFN_MIGRATE (1UL << 1) | |
8763cb45 | 133 | #define MIGRATE_PFN_WRITE (1UL << 3) |
a5430dda | 134 | #define MIGRATE_PFN_SHIFT 6 |
8763cb45 JG |
135 | |
136 | static inline struct page *migrate_pfn_to_page(unsigned long mpfn) | |
137 | { | |
138 | if (!(mpfn & MIGRATE_PFN_VALID)) | |
139 | return NULL; | |
140 | return pfn_to_page(mpfn >> MIGRATE_PFN_SHIFT); | |
141 | } | |
142 | ||
143 | static inline unsigned long migrate_pfn(unsigned long pfn) | |
144 | { | |
145 | return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID; | |
146 | } | |
147 | ||
5143192c RC |
148 | enum migrate_vma_direction { |
149 | MIGRATE_VMA_SELECT_SYSTEM = 1 << 0, | |
150 | MIGRATE_VMA_SELECT_DEVICE_PRIVATE = 1 << 1, | |
151 | }; | |
152 | ||
a7d1f22b CH |
153 | struct migrate_vma { |
154 | struct vm_area_struct *vma; | |
155 | /* | |
156 | * Both src and dst array must be big enough for | |
157 | * (end - start) >> PAGE_SHIFT entries. | |
158 | * | |
159 | * The src array must not be modified by the caller after | |
160 | * migrate_vma_setup(), and must not change the dst array after | |
161 | * migrate_vma_pages() returns. | |
162 | */ | |
163 | unsigned long *dst; | |
164 | unsigned long *src; | |
165 | unsigned long cpages; | |
166 | unsigned long npages; | |
167 | unsigned long start; | |
168 | unsigned long end; | |
800bb1c8 CH |
169 | |
170 | /* | |
171 | * Set to the owner value also stored in page->pgmap->owner for | |
5143192c RC |
172 | * migrating out of device private memory. The flags also need to |
173 | * be set to MIGRATE_VMA_SELECT_DEVICE_PRIVATE. | |
998427b3 RC |
174 | * The caller should always set this field when using mmu notifier |
175 | * callbacks to avoid device MMU invalidations for device private | |
176 | * pages that are not being migrated. | |
800bb1c8 | 177 | */ |
5143192c RC |
178 | void *pgmap_owner; |
179 | unsigned long flags; | |
8763cb45 JG |
180 | }; |
181 | ||
a7d1f22b CH |
182 | int migrate_vma_setup(struct migrate_vma *args); |
183 | void migrate_vma_pages(struct migrate_vma *migrate); | |
184 | void migrate_vma_finalize(struct migrate_vma *migrate); | |
8763cb45 JG |
185 | #endif /* CONFIG_MIGRATION */ |
186 | ||
b20a3503 | 187 | #endif /* _LINUX_MIGRATE_H */ |