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71e3aac0 AA |
1 | #ifndef _LINUX_HUGE_MM_H |
2 | #define _LINUX_HUGE_MM_H | |
3 | ||
4 | extern int do_huge_pmd_anonymous_page(struct mm_struct *mm, | |
5 | struct vm_area_struct *vma, | |
6 | unsigned long address, pmd_t *pmd, | |
7 | unsigned int flags); | |
8 | extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, | |
9 | pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr, | |
10 | struct vm_area_struct *vma); | |
a1dd450b WD |
11 | extern void huge_pmd_set_accessed(struct mm_struct *mm, |
12 | struct vm_area_struct *vma, | |
13 | unsigned long address, pmd_t *pmd, | |
14 | pmd_t orig_pmd, int dirty); | |
71e3aac0 AA |
15 | extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, |
16 | unsigned long address, pmd_t *pmd, | |
17 | pmd_t orig_pmd); | |
b676b293 | 18 | extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, |
71e3aac0 AA |
19 | unsigned long addr, |
20 | pmd_t *pmd, | |
21 | unsigned int flags); | |
b8d3c4c3 MK |
22 | extern int madvise_free_huge_pmd(struct mmu_gather *tlb, |
23 | struct vm_area_struct *vma, | |
24 | pmd_t *pmd, unsigned long addr, unsigned long next); | |
71e3aac0 AA |
25 | extern int zap_huge_pmd(struct mmu_gather *tlb, |
26 | struct vm_area_struct *vma, | |
f21760b1 | 27 | pmd_t *pmd, unsigned long addr); |
0ca1634d JW |
28 | extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
29 | unsigned long addr, unsigned long end, | |
30 | unsigned char *vec); | |
4b471e88 | 31 | extern bool move_huge_pmd(struct vm_area_struct *vma, |
37a1c49a AA |
32 | struct vm_area_struct *new_vma, |
33 | unsigned long old_addr, | |
34 | unsigned long new_addr, unsigned long old_end, | |
35 | pmd_t *old_pmd, pmd_t *new_pmd); | |
cd7548ab | 36 | extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
4b10e7d5 MG |
37 | unsigned long addr, pgprot_t newprot, |
38 | int prot_numa); | |
5cad465d | 39 | int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *, |
f25748e3 | 40 | pfn_t pfn, bool write); |
71e3aac0 AA |
41 | |
42 | enum transparent_hugepage_flag { | |
43 | TRANSPARENT_HUGEPAGE_FLAG, | |
44 | TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, | |
45 | TRANSPARENT_HUGEPAGE_DEFRAG_FLAG, | |
46 | TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, | |
ba76149f | 47 | TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, |
79da5407 | 48 | TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, |
71e3aac0 AA |
49 | #ifdef CONFIG_DEBUG_VM |
50 | TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, | |
51 | #endif | |
52 | }; | |
53 | ||
d8c37c48 NH |
54 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) |
55 | #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) | |
56 | ||
71e3aac0 | 57 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
fde52796 AK |
58 | #define HPAGE_PMD_SHIFT PMD_SHIFT |
59 | #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) | |
60 | #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) | |
71e3aac0 | 61 | |
20995974 AS |
62 | extern bool is_vma_temporary_stack(struct vm_area_struct *vma); |
63 | ||
71e3aac0 | 64 | #define transparent_hugepage_enabled(__vma) \ |
a664b2d8 AA |
65 | ((transparent_hugepage_flags & \ |
66 | (1<<TRANSPARENT_HUGEPAGE_FLAG) || \ | |
67 | (transparent_hugepage_flags & \ | |
68 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \ | |
69 | ((__vma)->vm_flags & VM_HUGEPAGE))) && \ | |
a7d6e4ec AA |
70 | !((__vma)->vm_flags & VM_NOHUGEPAGE) && \ |
71 | !is_vma_temporary_stack(__vma)) | |
71e3aac0 AA |
72 | #define transparent_hugepage_defrag(__vma) \ |
73 | ((transparent_hugepage_flags & \ | |
74 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \ | |
75 | (transparent_hugepage_flags & \ | |
76 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \ | |
77 | (__vma)->vm_flags & VM_HUGEPAGE)) | |
79da5407 KS |
78 | #define transparent_hugepage_use_zero_page() \ |
79 | (transparent_hugepage_flags & \ | |
80 | (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) | |
71e3aac0 AA |
81 | #ifdef CONFIG_DEBUG_VM |
82 | #define transparent_hugepage_debug_cow() \ | |
83 | (transparent_hugepage_flags & \ | |
84 | (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG)) | |
85 | #else /* CONFIG_DEBUG_VM */ | |
86 | #define transparent_hugepage_debug_cow() 0 | |
87 | #endif /* CONFIG_DEBUG_VM */ | |
88 | ||
89 | extern unsigned long transparent_hugepage_flags; | |
ad0bed24 | 90 | |
9a982250 KS |
91 | extern void prep_transhuge_page(struct page *page); |
92 | extern void free_transhuge_page(struct page *page); | |
93 | ||
e9b61f19 KS |
94 | int split_huge_page_to_list(struct page *page, struct list_head *list); |
95 | static inline int split_huge_page(struct page *page) | |
96 | { | |
97 | return split_huge_page_to_list(page, NULL); | |
98 | } | |
9a982250 | 99 | void deferred_split_huge_page(struct page *page); |
eef1b3ba KS |
100 | |
101 | void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, | |
102 | unsigned long address); | |
103 | ||
104 | #define split_huge_pmd(__vma, __pmd, __address) \ | |
105 | do { \ | |
106 | pmd_t *____pmd = (__pmd); \ | |
5c7fb56e DW |
107 | if (pmd_trans_huge(*____pmd) \ |
108 | || pmd_devmap(*____pmd)) \ | |
eef1b3ba KS |
109 | __split_huge_pmd(__vma, __pmd, __address); \ |
110 | } while (0) | |
ad0bed24 | 111 | |
dfa5e237 | 112 | #if HPAGE_PMD_ORDER >= MAX_ORDER |
71e3aac0 AA |
113 | #error "hugepages can't be allocated by the buddy allocator" |
114 | #endif | |
60ab3244 AA |
115 | extern int hugepage_madvise(struct vm_area_struct *vma, |
116 | unsigned long *vm_flags, int advice); | |
e1b9996b | 117 | extern void vma_adjust_trans_huge(struct vm_area_struct *vma, |
94fcc585 AA |
118 | unsigned long start, |
119 | unsigned long end, | |
120 | long adjust_next); | |
4b471e88 | 121 | extern bool __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, |
bf929152 | 122 | spinlock_t **ptl); |
025c5b24 | 123 | /* mmap_sem must be held on entry */ |
4b471e88 | 124 | static inline bool pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, |
bf929152 | 125 | spinlock_t **ptl) |
025c5b24 | 126 | { |
81d1b09c | 127 | VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma); |
5c7fb56e | 128 | if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) |
bf929152 | 129 | return __pmd_trans_huge_lock(pmd, vma, ptl); |
025c5b24 | 130 | else |
4b471e88 | 131 | return false; |
025c5b24 | 132 | } |
2c888cfb RR |
133 | static inline int hpage_nr_pages(struct page *page) |
134 | { | |
135 | if (unlikely(PageTransHuge(page))) | |
136 | return HPAGE_PMD_NR; | |
137 | return 1; | |
138 | } | |
d10e63f2 | 139 | |
4daae3b4 MG |
140 | extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
141 | unsigned long addr, pmd_t pmd, pmd_t *pmdp); | |
d10e63f2 | 142 | |
56873f43 WY |
143 | extern struct page *huge_zero_page; |
144 | ||
145 | static inline bool is_huge_zero_page(struct page *page) | |
146 | { | |
147 | return ACCESS_ONCE(huge_zero_page) == page; | |
148 | } | |
149 | ||
fc437044 MW |
150 | static inline bool is_huge_zero_pmd(pmd_t pmd) |
151 | { | |
152 | return is_huge_zero_page(pmd_page(pmd)); | |
153 | } | |
154 | ||
155 | struct page *get_huge_zero_page(void); | |
fc437044 | 156 | |
71e3aac0 | 157 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
d8c37c48 NH |
158 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) |
159 | #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) | |
160 | #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) | |
71e3aac0 | 161 | |
2c888cfb RR |
162 | #define hpage_nr_pages(x) 1 |
163 | ||
71e3aac0 AA |
164 | #define transparent_hugepage_enabled(__vma) 0 |
165 | ||
166 | #define transparent_hugepage_flags 0UL | |
5bc7b8ac SL |
167 | static inline int |
168 | split_huge_page_to_list(struct page *page, struct list_head *list) | |
169 | { | |
170 | return 0; | |
171 | } | |
71e3aac0 AA |
172 | static inline int split_huge_page(struct page *page) |
173 | { | |
174 | return 0; | |
175 | } | |
9a982250 | 176 | static inline void deferred_split_huge_page(struct page *page) {} |
78ddc534 | 177 | #define split_huge_pmd(__vma, __pmd, __address) \ |
e180377f | 178 | do { } while (0) |
60ab3244 AA |
179 | static inline int hugepage_madvise(struct vm_area_struct *vma, |
180 | unsigned long *vm_flags, int advice) | |
0af4e98b AA |
181 | { |
182 | BUG(); | |
183 | return 0; | |
184 | } | |
94fcc585 AA |
185 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
186 | unsigned long start, | |
187 | unsigned long end, | |
188 | long adjust_next) | |
189 | { | |
190 | } | |
4b471e88 | 191 | static inline bool pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, |
bf929152 | 192 | spinlock_t **ptl) |
025c5b24 | 193 | { |
4b471e88 | 194 | return false; |
025c5b24 | 195 | } |
d10e63f2 | 196 | |
4daae3b4 MG |
197 | static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
198 | unsigned long addr, pmd_t pmd, pmd_t *pmdp) | |
d10e63f2 | 199 | { |
4daae3b4 | 200 | return 0; |
d10e63f2 MG |
201 | } |
202 | ||
56873f43 WY |
203 | static inline bool is_huge_zero_page(struct page *page) |
204 | { | |
205 | return false; | |
206 | } | |
207 | ||
71e3aac0 AA |
208 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
209 | ||
210 | #endif /* _LINUX_HUGE_MM_H */ |