Commit | Line | Data |
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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); | |
71e3aac0 AA |
36 | |
37 | enum transparent_hugepage_flag { | |
38 | TRANSPARENT_HUGEPAGE_FLAG, | |
39 | TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, | |
40 | TRANSPARENT_HUGEPAGE_DEFRAG_FLAG, | |
41 | TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, | |
ba76149f | 42 | TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, |
79da5407 | 43 | TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, |
71e3aac0 AA |
44 | #ifdef CONFIG_DEBUG_VM |
45 | TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, | |
46 | #endif | |
47 | }; | |
48 | ||
49 | enum page_check_address_pmd_flag { | |
50 | PAGE_CHECK_ADDRESS_PMD_FLAG, | |
51 | PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG, | |
52 | PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG, | |
53 | }; | |
54 | extern pmd_t *page_check_address_pmd(struct page *page, | |
55 | struct mm_struct *mm, | |
56 | unsigned long address, | |
57 | enum page_check_address_pmd_flag flag); | |
58 | ||
d8c37c48 NH |
59 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) |
60 | #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) | |
61 | ||
71e3aac0 AA |
62 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
63 | #define HPAGE_PMD_SHIFT HPAGE_SHIFT | |
64 | #define HPAGE_PMD_MASK HPAGE_MASK | |
65 | #define HPAGE_PMD_SIZE HPAGE_SIZE | |
66 | ||
20995974 AS |
67 | extern bool is_vma_temporary_stack(struct vm_area_struct *vma); |
68 | ||
71e3aac0 | 69 | #define transparent_hugepage_enabled(__vma) \ |
a664b2d8 AA |
70 | ((transparent_hugepage_flags & \ |
71 | (1<<TRANSPARENT_HUGEPAGE_FLAG) || \ | |
72 | (transparent_hugepage_flags & \ | |
73 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \ | |
74 | ((__vma)->vm_flags & VM_HUGEPAGE))) && \ | |
a7d6e4ec AA |
75 | !((__vma)->vm_flags & VM_NOHUGEPAGE) && \ |
76 | !is_vma_temporary_stack(__vma)) | |
71e3aac0 AA |
77 | #define transparent_hugepage_defrag(__vma) \ |
78 | ((transparent_hugepage_flags & \ | |
79 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \ | |
80 | (transparent_hugepage_flags & \ | |
81 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \ | |
82 | (__vma)->vm_flags & VM_HUGEPAGE)) | |
79da5407 KS |
83 | #define transparent_hugepage_use_zero_page() \ |
84 | (transparent_hugepage_flags & \ | |
85 | (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) | |
71e3aac0 AA |
86 | #ifdef CONFIG_DEBUG_VM |
87 | #define transparent_hugepage_debug_cow() \ | |
88 | (transparent_hugepage_flags & \ | |
89 | (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG)) | |
90 | #else /* CONFIG_DEBUG_VM */ | |
91 | #define transparent_hugepage_debug_cow() 0 | |
92 | #endif /* CONFIG_DEBUG_VM */ | |
93 | ||
94 | extern unsigned long transparent_hugepage_flags; | |
95 | extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, | |
96 | pmd_t *dst_pmd, pmd_t *src_pmd, | |
97 | struct vm_area_struct *vma, | |
98 | unsigned long addr, unsigned long end); | |
99 | extern int handle_pte_fault(struct mm_struct *mm, | |
100 | struct vm_area_struct *vma, unsigned long address, | |
101 | pte_t *pte, pmd_t *pmd, unsigned int flags); | |
102 | extern int split_huge_page(struct page *page); | |
e180377f KS |
103 | extern void __split_huge_page_pmd(struct vm_area_struct *vma, |
104 | unsigned long address, pmd_t *pmd); | |
105 | #define split_huge_page_pmd(__vma, __address, __pmd) \ | |
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) | |
e180377f KS |
120 | extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address, |
121 | pmd_t *pmd); | |
71e3aac0 AA |
122 | #if HPAGE_PMD_ORDER > MAX_ORDER |
123 | #error "hugepages can't be allocated by the buddy allocator" | |
124 | #endif | |
60ab3244 AA |
125 | extern int hugepage_madvise(struct vm_area_struct *vma, |
126 | unsigned long *vm_flags, int advice); | |
94fcc585 AA |
127 | extern void __vma_adjust_trans_huge(struct vm_area_struct *vma, |
128 | unsigned long start, | |
129 | unsigned long end, | |
130 | long adjust_next); | |
025c5b24 NH |
131 | extern int __pmd_trans_huge_lock(pmd_t *pmd, |
132 | struct vm_area_struct *vma); | |
133 | /* mmap_sem must be held on entry */ | |
134 | static inline int pmd_trans_huge_lock(pmd_t *pmd, | |
135 | struct vm_area_struct *vma) | |
136 | { | |
137 | VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem)); | |
138 | if (pmd_trans_huge(*pmd)) | |
139 | return __pmd_trans_huge_lock(pmd, vma); | |
140 | else | |
141 | return 0; | |
142 | } | |
94fcc585 AA |
143 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
144 | unsigned long start, | |
145 | unsigned long end, | |
146 | long adjust_next) | |
147 | { | |
78f11a25 | 148 | if (!vma->anon_vma || vma->vm_ops) |
94fcc585 AA |
149 | return; |
150 | __vma_adjust_trans_huge(vma, start, end, adjust_next); | |
151 | } | |
2c888cfb RR |
152 | static inline int hpage_nr_pages(struct page *page) |
153 | { | |
154 | if (unlikely(PageTransHuge(page))) | |
155 | return HPAGE_PMD_NR; | |
156 | return 1; | |
157 | } | |
22e5c47e AA |
158 | static inline struct page *compound_trans_head(struct page *page) |
159 | { | |
160 | if (PageTail(page)) { | |
161 | struct page *head; | |
162 | head = page->first_page; | |
163 | smp_rmb(); | |
164 | /* | |
165 | * head may be a dangling pointer. | |
166 | * __split_huge_page_refcount clears PageTail before | |
167 | * overwriting first_page, so if PageTail is still | |
168 | * there it means the head pointer isn't dangling. | |
169 | */ | |
170 | if (PageTail(page)) | |
171 | return head; | |
172 | } | |
173 | return page; | |
174 | } | |
d10e63f2 | 175 | |
4daae3b4 MG |
176 | extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
177 | unsigned long addr, pmd_t pmd, pmd_t *pmdp); | |
d10e63f2 | 178 | |
71e3aac0 | 179 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
d8c37c48 NH |
180 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) |
181 | #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) | |
182 | #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) | |
71e3aac0 | 183 | |
2c888cfb RR |
184 | #define hpage_nr_pages(x) 1 |
185 | ||
71e3aac0 AA |
186 | #define transparent_hugepage_enabled(__vma) 0 |
187 | ||
188 | #define transparent_hugepage_flags 0UL | |
189 | static inline int split_huge_page(struct page *page) | |
190 | { | |
191 | return 0; | |
192 | } | |
e180377f | 193 | #define split_huge_page_pmd(__vma, __address, __pmd) \ |
71e3aac0 AA |
194 | do { } while (0) |
195 | #define wait_split_huge_page(__anon_vma, __pmd) \ | |
196 | do { } while (0) | |
e180377f KS |
197 | #define split_huge_page_pmd_mm(__mm, __address, __pmd) \ |
198 | do { } while (0) | |
22e5c47e | 199 | #define compound_trans_head(page) compound_head(page) |
60ab3244 AA |
200 | static inline int hugepage_madvise(struct vm_area_struct *vma, |
201 | unsigned long *vm_flags, int advice) | |
0af4e98b AA |
202 | { |
203 | BUG(); | |
204 | return 0; | |
205 | } | |
94fcc585 AA |
206 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
207 | unsigned long start, | |
208 | unsigned long end, | |
209 | long adjust_next) | |
210 | { | |
211 | } | |
025c5b24 NH |
212 | static inline int pmd_trans_huge_lock(pmd_t *pmd, |
213 | struct vm_area_struct *vma) | |
214 | { | |
215 | return 0; | |
216 | } | |
d10e63f2 | 217 | |
4daae3b4 MG |
218 | static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
219 | unsigned long addr, pmd_t pmd, pmd_t *pmdp) | |
d10e63f2 | 220 | { |
4daae3b4 | 221 | return 0; |
d10e63f2 MG |
222 | } |
223 | ||
71e3aac0 AA |
224 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
225 | ||
226 | #endif /* _LINUX_HUGE_MM_H */ |