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 | |
57ed7b43 WO |
22 | /* |
23 | * Keep sync with: | |
24 | * - macro MIGRATE_REASON in include/trace/events/migrate.h | |
25 | * - migrate_reason_names[MR_TYPES] in mm/debug.c | |
26 | */ | |
7b2a2d4a MG |
27 | enum migrate_reason { |
28 | MR_COMPACTION, | |
29 | MR_MEMORY_FAILURE, | |
30 | MR_MEMORY_HOTPLUG, | |
31 | MR_SYSCALL, /* also applies to cpusets */ | |
32 | MR_MEMPOLICY_MBIND, | |
7039e1db | 33 | MR_NUMA_MISPLACED, |
31025351 | 34 | MR_CONTIG_RANGE, |
d1e153fe | 35 | MR_LONGTERM_PIN, |
26aa2d19 | 36 | MR_DEMOTION, |
7cd12b4a | 37 | MR_TYPES |
7b2a2d4a | 38 | }; |
78bd5209 | 39 | |
9a2f45ff | 40 | extern const char *migrate_reason_names[MR_TYPES]; |
7cd12b4a | 41 | |
906e0be1 | 42 | #ifdef CONFIG_MIGRATION |
64cdd548 | 43 | |
5733c7d1 | 44 | extern void putback_movable_pages(struct list_head *l); |
9927e388 PJ |
45 | extern int migrate_page(struct address_space *mapping, |
46 | struct page *newpage, struct page *page, | |
47 | enum migrate_mode mode); | |
68711a74 | 48 | extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, |
5ac95884 YS |
49 | unsigned long private, enum migrate_mode mode, int reason, |
50 | unsigned int *ret_succeeded); | |
19fc7bed | 51 | extern struct page *alloc_migration_target(struct page *page, unsigned long private); |
9e5bcd61 | 52 | extern int isolate_movable_page(struct page *page, isolate_mode_t mode); |
95a402c3 | 53 | |
2916ecc0 | 54 | extern void migrate_page_states(struct page *newpage, struct page *page); |
290408d4 NH |
55 | extern void migrate_page_copy(struct page *newpage, struct page *page); |
56 | extern int migrate_huge_page_move_mapping(struct address_space *mapping, | |
57 | struct page *newpage, struct page *page); | |
36bc08cc | 58 | extern int migrate_page_move_mapping(struct address_space *mapping, |
37109694 | 59 | struct page *newpage, struct page *page, int extra_count); |
b20a3503 | 60 | #else |
64cdd548 | 61 | |
5733c7d1 | 62 | static inline void putback_movable_pages(struct list_head *l) {} |
68711a74 DR |
63 | static inline int migrate_pages(struct list_head *l, new_page_t new, |
64 | free_page_t free, unsigned long private, enum migrate_mode mode, | |
5ac95884 | 65 | int reason, unsigned int *ret_succeeded) |
9c620e2b | 66 | { return -ENOSYS; } |
19fc7bed JK |
67 | static inline struct page *alloc_migration_target(struct page *page, |
68 | unsigned long private) | |
b4b38223 | 69 | { return NULL; } |
cbae0170 YX |
70 | static inline int isolate_movable_page(struct page *page, isolate_mode_t mode) |
71 | { return -EBUSY; } | |
9bf9e89c | 72 | |
2916ecc0 JG |
73 | static inline void migrate_page_states(struct page *newpage, struct page *page) |
74 | { | |
75 | } | |
76 | ||
290408d4 NH |
77 | static inline void migrate_page_copy(struct page *newpage, |
78 | struct page *page) {} | |
79 | ||
6f39ce05 | 80 | static inline int migrate_huge_page_move_mapping(struct address_space *mapping, |
290408d4 NH |
81 | struct page *newpage, struct page *page) |
82 | { | |
83 | return -ENOSYS; | |
84 | } | |
b20a3503 | 85 | #endif /* CONFIG_MIGRATION */ |
7039e1db | 86 | |
dd4123f3 MK |
87 | #ifdef CONFIG_COMPACTION |
88 | extern int PageMovable(struct page *page); | |
89 | extern void __SetPageMovable(struct page *page, struct address_space *mapping); | |
90 | extern void __ClearPageMovable(struct page *page); | |
91 | #else | |
a553e3cd | 92 | static inline int PageMovable(struct page *page) { return 0; } |
dd4123f3 MK |
93 | static inline void __SetPageMovable(struct page *page, |
94 | struct address_space *mapping) | |
95 | { | |
96 | } | |
97 | static inline void __ClearPageMovable(struct page *page) | |
98 | { | |
99 | } | |
100 | #endif | |
101 | ||
7039e1db | 102 | #ifdef CONFIG_NUMA_BALANCING |
1bc115d8 MG |
103 | extern int migrate_misplaced_page(struct page *page, |
104 | struct vm_area_struct *vma, int node); | |
7039e1db | 105 | #else |
1bc115d8 MG |
106 | static inline int migrate_misplaced_page(struct page *page, |
107 | struct vm_area_struct *vma, int node) | |
7039e1db PZ |
108 | { |
109 | return -EAGAIN; /* can't migrate now */ | |
110 | } | |
220018d3 | 111 | #endif /* CONFIG_NUMA_BALANCING */ |
b32967ff | 112 | |
8763cb45 JG |
113 | #ifdef CONFIG_MIGRATION |
114 | ||
a5430dda JG |
115 | /* |
116 | * Watch out for PAE architecture, which has an unsigned long, and might not | |
117 | * have enough bits to store all physical address and flags. So far we have | |
118 | * enough room for all our flags. | |
119 | */ | |
8763cb45 JG |
120 | #define MIGRATE_PFN_VALID (1UL << 0) |
121 | #define MIGRATE_PFN_MIGRATE (1UL << 1) | |
122 | #define MIGRATE_PFN_LOCKED (1UL << 2) | |
123 | #define MIGRATE_PFN_WRITE (1UL << 3) | |
a5430dda | 124 | #define MIGRATE_PFN_SHIFT 6 |
8763cb45 JG |
125 | |
126 | static inline struct page *migrate_pfn_to_page(unsigned long mpfn) | |
127 | { | |
128 | if (!(mpfn & MIGRATE_PFN_VALID)) | |
129 | return NULL; | |
130 | return pfn_to_page(mpfn >> MIGRATE_PFN_SHIFT); | |
131 | } | |
132 | ||
133 | static inline unsigned long migrate_pfn(unsigned long pfn) | |
134 | { | |
135 | return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID; | |
136 | } | |
137 | ||
5143192c RC |
138 | enum migrate_vma_direction { |
139 | MIGRATE_VMA_SELECT_SYSTEM = 1 << 0, | |
140 | MIGRATE_VMA_SELECT_DEVICE_PRIVATE = 1 << 1, | |
141 | }; | |
142 | ||
a7d1f22b CH |
143 | struct migrate_vma { |
144 | struct vm_area_struct *vma; | |
145 | /* | |
146 | * Both src and dst array must be big enough for | |
147 | * (end - start) >> PAGE_SHIFT entries. | |
148 | * | |
149 | * The src array must not be modified by the caller after | |
150 | * migrate_vma_setup(), and must not change the dst array after | |
151 | * migrate_vma_pages() returns. | |
152 | */ | |
153 | unsigned long *dst; | |
154 | unsigned long *src; | |
155 | unsigned long cpages; | |
156 | unsigned long npages; | |
157 | unsigned long start; | |
158 | unsigned long end; | |
800bb1c8 CH |
159 | |
160 | /* | |
161 | * Set to the owner value also stored in page->pgmap->owner for | |
5143192c RC |
162 | * migrating out of device private memory. The flags also need to |
163 | * be set to MIGRATE_VMA_SELECT_DEVICE_PRIVATE. | |
998427b3 RC |
164 | * The caller should always set this field when using mmu notifier |
165 | * callbacks to avoid device MMU invalidations for device private | |
166 | * pages that are not being migrated. | |
800bb1c8 | 167 | */ |
5143192c RC |
168 | void *pgmap_owner; |
169 | unsigned long flags; | |
8763cb45 JG |
170 | }; |
171 | ||
a7d1f22b CH |
172 | int migrate_vma_setup(struct migrate_vma *args); |
173 | void migrate_vma_pages(struct migrate_vma *migrate); | |
174 | void migrate_vma_finalize(struct migrate_vma *migrate); | |
26aa2d19 DH |
175 | int next_demotion_node(int node); |
176 | ||
177 | #else /* CONFIG_MIGRATION disabled: */ | |
178 | ||
179 | static inline int next_demotion_node(int node) | |
180 | { | |
181 | return NUMA_NO_NODE; | |
182 | } | |
8763cb45 JG |
183 | |
184 | #endif /* CONFIG_MIGRATION */ | |
185 | ||
b20a3503 | 186 | #endif /* _LINUX_MIGRATE_H */ |