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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); | |
22 | extern int zap_huge_pmd(struct mmu_gather *tlb, | |
23 | struct vm_area_struct *vma, | |
f21760b1 | 24 | pmd_t *pmd, unsigned long addr); |
0ca1634d JW |
25 | extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
26 | unsigned long addr, unsigned long end, | |
27 | unsigned char *vec); | |
37a1c49a AA |
28 | extern int move_huge_pmd(struct vm_area_struct *vma, |
29 | struct vm_area_struct *new_vma, | |
30 | unsigned long old_addr, | |
31 | unsigned long new_addr, unsigned long old_end, | |
32 | pmd_t *old_pmd, pmd_t *new_pmd); | |
cd7548ab | 33 | extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
4b10e7d5 MG |
34 | unsigned long addr, pgprot_t newprot, |
35 | int prot_numa); | |
5cad465d MW |
36 | int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *, |
37 | unsigned long pfn, bool write); | |
71e3aac0 AA |
38 | |
39 | enum transparent_hugepage_flag { | |
40 | TRANSPARENT_HUGEPAGE_FLAG, | |
41 | TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, | |
42 | TRANSPARENT_HUGEPAGE_DEFRAG_FLAG, | |
43 | TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, | |
ba76149f | 44 | TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, |
79da5407 | 45 | TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, |
71e3aac0 AA |
46 | #ifdef CONFIG_DEBUG_VM |
47 | TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, | |
48 | #endif | |
49 | }; | |
50 | ||
51 | enum page_check_address_pmd_flag { | |
52 | PAGE_CHECK_ADDRESS_PMD_FLAG, | |
53 | PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG, | |
54 | PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG, | |
55 | }; | |
56 | extern pmd_t *page_check_address_pmd(struct page *page, | |
57 | struct mm_struct *mm, | |
58 | unsigned long address, | |
117b0791 KS |
59 | enum page_check_address_pmd_flag flag, |
60 | spinlock_t **ptl); | |
71e3aac0 | 61 | |
d8c37c48 NH |
62 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) |
63 | #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) | |
64 | ||
71e3aac0 | 65 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
fde52796 AK |
66 | #define HPAGE_PMD_SHIFT PMD_SHIFT |
67 | #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) | |
68 | #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) | |
71e3aac0 | 69 | |
20995974 AS |
70 | extern bool is_vma_temporary_stack(struct vm_area_struct *vma); |
71 | ||
71e3aac0 | 72 | #define transparent_hugepage_enabled(__vma) \ |
a664b2d8 AA |
73 | ((transparent_hugepage_flags & \ |
74 | (1<<TRANSPARENT_HUGEPAGE_FLAG) || \ | |
75 | (transparent_hugepage_flags & \ | |
76 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \ | |
77 | ((__vma)->vm_flags & VM_HUGEPAGE))) && \ | |
a7d6e4ec AA |
78 | !((__vma)->vm_flags & VM_NOHUGEPAGE) && \ |
79 | !is_vma_temporary_stack(__vma)) | |
71e3aac0 AA |
80 | #define transparent_hugepage_defrag(__vma) \ |
81 | ((transparent_hugepage_flags & \ | |
82 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \ | |
83 | (transparent_hugepage_flags & \ | |
84 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \ | |
85 | (__vma)->vm_flags & VM_HUGEPAGE)) | |
79da5407 KS |
86 | #define transparent_hugepage_use_zero_page() \ |
87 | (transparent_hugepage_flags & \ | |
88 | (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) | |
71e3aac0 AA |
89 | #ifdef CONFIG_DEBUG_VM |
90 | #define transparent_hugepage_debug_cow() \ | |
91 | (transparent_hugepage_flags & \ | |
92 | (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG)) | |
93 | #else /* CONFIG_DEBUG_VM */ | |
94 | #define transparent_hugepage_debug_cow() 0 | |
95 | #endif /* CONFIG_DEBUG_VM */ | |
96 | ||
97 | extern unsigned long transparent_hugepage_flags; | |
5bc7b8ac SL |
98 | extern int split_huge_page_to_list(struct page *page, struct list_head *list); |
99 | static inline int split_huge_page(struct page *page) | |
100 | { | |
101 | return split_huge_page_to_list(page, NULL); | |
102 | } | |
e180377f KS |
103 | extern void __split_huge_page_pmd(struct vm_area_struct *vma, |
104 | unsigned long address, pmd_t *pmd); | |
78ddc534 | 105 | #define split_huge_pmd(__vma, __pmd, __address) \ |
71e3aac0 AA |
106 | do { \ |
107 | pmd_t *____pmd = (__pmd); \ | |
108 | if (unlikely(pmd_trans_huge(*____pmd))) \ | |
e180377f KS |
109 | __split_huge_page_pmd(__vma, __address, \ |
110 | ____pmd); \ | |
71e3aac0 AA |
111 | } while (0) |
112 | #define wait_split_huge_page(__anon_vma, __pmd) \ | |
113 | do { \ | |
114 | pmd_t *____pmd = (__pmd); \ | |
4fc3f1d6 | 115 | anon_vma_lock_write(__anon_vma); \ |
08b52706 | 116 | anon_vma_unlock_write(__anon_vma); \ |
71e3aac0 AA |
117 | BUG_ON(pmd_trans_splitting(*____pmd) || \ |
118 | pmd_trans_huge(*____pmd)); \ | |
119 | } while (0) | |
dfa5e237 | 120 | #if HPAGE_PMD_ORDER >= MAX_ORDER |
71e3aac0 AA |
121 | #error "hugepages can't be allocated by the buddy allocator" |
122 | #endif | |
60ab3244 AA |
123 | extern int hugepage_madvise(struct vm_area_struct *vma, |
124 | unsigned long *vm_flags, int advice); | |
e1b9996b | 125 | extern void vma_adjust_trans_huge(struct vm_area_struct *vma, |
94fcc585 AA |
126 | unsigned long start, |
127 | unsigned long end, | |
128 | long adjust_next); | |
bf929152 KS |
129 | extern int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, |
130 | spinlock_t **ptl); | |
025c5b24 | 131 | /* mmap_sem must be held on entry */ |
bf929152 KS |
132 | static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, |
133 | spinlock_t **ptl) | |
025c5b24 | 134 | { |
81d1b09c | 135 | VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma); |
025c5b24 | 136 | if (pmd_trans_huge(*pmd)) |
bf929152 | 137 | return __pmd_trans_huge_lock(pmd, vma, ptl); |
025c5b24 NH |
138 | else |
139 | return 0; | |
140 | } | |
2c888cfb RR |
141 | static inline int hpage_nr_pages(struct page *page) |
142 | { | |
143 | if (unlikely(PageTransHuge(page))) | |
144 | return HPAGE_PMD_NR; | |
145 | return 1; | |
146 | } | |
d10e63f2 | 147 | |
4daae3b4 MG |
148 | extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
149 | unsigned long addr, pmd_t pmd, pmd_t *pmdp); | |
d10e63f2 | 150 | |
56873f43 WY |
151 | extern struct page *huge_zero_page; |
152 | ||
153 | static inline bool is_huge_zero_page(struct page *page) | |
154 | { | |
155 | return ACCESS_ONCE(huge_zero_page) == page; | |
156 | } | |
157 | ||
fc437044 MW |
158 | static inline bool is_huge_zero_pmd(pmd_t pmd) |
159 | { | |
160 | return is_huge_zero_page(pmd_page(pmd)); | |
161 | } | |
162 | ||
163 | struct page *get_huge_zero_page(void); | |
fc437044 | 164 | |
71e3aac0 | 165 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
d8c37c48 NH |
166 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) |
167 | #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) | |
168 | #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) | |
71e3aac0 | 169 | |
2c888cfb RR |
170 | #define hpage_nr_pages(x) 1 |
171 | ||
71e3aac0 AA |
172 | #define transparent_hugepage_enabled(__vma) 0 |
173 | ||
174 | #define transparent_hugepage_flags 0UL | |
5bc7b8ac SL |
175 | static inline int |
176 | split_huge_page_to_list(struct page *page, struct list_head *list) | |
177 | { | |
178 | return 0; | |
179 | } | |
71e3aac0 AA |
180 | static inline int split_huge_page(struct page *page) |
181 | { | |
182 | return 0; | |
183 | } | |
71e3aac0 AA |
184 | #define wait_split_huge_page(__anon_vma, __pmd) \ |
185 | do { } while (0) | |
78ddc534 | 186 | #define split_huge_pmd(__vma, __pmd, __address) \ |
e180377f | 187 | do { } while (0) |
60ab3244 AA |
188 | static inline int hugepage_madvise(struct vm_area_struct *vma, |
189 | unsigned long *vm_flags, int advice) | |
0af4e98b AA |
190 | { |
191 | BUG(); | |
192 | return 0; | |
193 | } | |
94fcc585 AA |
194 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
195 | unsigned long start, | |
196 | unsigned long end, | |
197 | long adjust_next) | |
198 | { | |
199 | } | |
bf929152 KS |
200 | static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, |
201 | spinlock_t **ptl) | |
025c5b24 NH |
202 | { |
203 | return 0; | |
204 | } | |
d10e63f2 | 205 | |
4daae3b4 MG |
206 | static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
207 | unsigned long addr, pmd_t pmd, pmd_t *pmdp) | |
d10e63f2 | 208 | { |
4daae3b4 | 209 | return 0; |
d10e63f2 MG |
210 | } |
211 | ||
56873f43 WY |
212 | static inline bool is_huge_zero_page(struct page *page) |
213 | { | |
214 | return false; | |
215 | } | |
216 | ||
71e3aac0 AA |
217 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
218 | ||
219 | #endif /* _LINUX_HUGE_MM_H */ |