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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); | |
11 | extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, | |
12 | unsigned long address, pmd_t *pmd, | |
13 | pmd_t orig_pmd); | |
14 | extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm); | |
15 | extern struct page *follow_trans_huge_pmd(struct mm_struct *mm, | |
16 | unsigned long addr, | |
17 | pmd_t *pmd, | |
18 | unsigned int flags); | |
19 | extern int zap_huge_pmd(struct mmu_gather *tlb, | |
20 | struct vm_area_struct *vma, | |
f21760b1 | 21 | pmd_t *pmd, unsigned long addr); |
0ca1634d JW |
22 | extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
23 | unsigned long addr, unsigned long end, | |
24 | unsigned char *vec); | |
37a1c49a AA |
25 | extern int move_huge_pmd(struct vm_area_struct *vma, |
26 | struct vm_area_struct *new_vma, | |
27 | unsigned long old_addr, | |
28 | unsigned long new_addr, unsigned long old_end, | |
29 | pmd_t *old_pmd, pmd_t *new_pmd); | |
cd7548ab JW |
30 | extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
31 | unsigned long addr, pgprot_t newprot); | |
71e3aac0 AA |
32 | |
33 | enum transparent_hugepage_flag { | |
34 | TRANSPARENT_HUGEPAGE_FLAG, | |
35 | TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, | |
36 | TRANSPARENT_HUGEPAGE_DEFRAG_FLAG, | |
37 | TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, | |
ba76149f | 38 | TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, |
71e3aac0 AA |
39 | #ifdef CONFIG_DEBUG_VM |
40 | TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, | |
41 | #endif | |
42 | }; | |
43 | ||
44 | enum page_check_address_pmd_flag { | |
45 | PAGE_CHECK_ADDRESS_PMD_FLAG, | |
46 | PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG, | |
47 | PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG, | |
48 | }; | |
49 | extern pmd_t *page_check_address_pmd(struct page *page, | |
50 | struct mm_struct *mm, | |
51 | unsigned long address, | |
52 | enum page_check_address_pmd_flag flag); | |
53 | ||
d8c37c48 NH |
54 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) |
55 | #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) | |
56 | ||
71e3aac0 AA |
57 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
58 | #define HPAGE_PMD_SHIFT HPAGE_SHIFT | |
59 | #define HPAGE_PMD_MASK HPAGE_MASK | |
60 | #define HPAGE_PMD_SIZE HPAGE_SIZE | |
61 | ||
62 | #define transparent_hugepage_enabled(__vma) \ | |
a664b2d8 AA |
63 | ((transparent_hugepage_flags & \ |
64 | (1<<TRANSPARENT_HUGEPAGE_FLAG) || \ | |
65 | (transparent_hugepage_flags & \ | |
66 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \ | |
67 | ((__vma)->vm_flags & VM_HUGEPAGE))) && \ | |
a7d6e4ec AA |
68 | !((__vma)->vm_flags & VM_NOHUGEPAGE) && \ |
69 | !is_vma_temporary_stack(__vma)) | |
71e3aac0 AA |
70 | #define transparent_hugepage_defrag(__vma) \ |
71 | ((transparent_hugepage_flags & \ | |
72 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \ | |
73 | (transparent_hugepage_flags & \ | |
74 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \ | |
75 | (__vma)->vm_flags & VM_HUGEPAGE)) | |
76 | #ifdef CONFIG_DEBUG_VM | |
77 | #define transparent_hugepage_debug_cow() \ | |
78 | (transparent_hugepage_flags & \ | |
79 | (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG)) | |
80 | #else /* CONFIG_DEBUG_VM */ | |
81 | #define transparent_hugepage_debug_cow() 0 | |
82 | #endif /* CONFIG_DEBUG_VM */ | |
83 | ||
84 | extern unsigned long transparent_hugepage_flags; | |
85 | extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, | |
86 | pmd_t *dst_pmd, pmd_t *src_pmd, | |
87 | struct vm_area_struct *vma, | |
88 | unsigned long addr, unsigned long end); | |
89 | extern int handle_pte_fault(struct mm_struct *mm, | |
90 | struct vm_area_struct *vma, unsigned long address, | |
91 | pte_t *pte, pmd_t *pmd, unsigned int flags); | |
92 | extern int split_huge_page(struct page *page); | |
93 | extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd); | |
94 | #define split_huge_page_pmd(__mm, __pmd) \ | |
95 | do { \ | |
96 | pmd_t *____pmd = (__pmd); \ | |
97 | if (unlikely(pmd_trans_huge(*____pmd))) \ | |
98 | __split_huge_page_pmd(__mm, ____pmd); \ | |
99 | } while (0) | |
100 | #define wait_split_huge_page(__anon_vma, __pmd) \ | |
101 | do { \ | |
102 | pmd_t *____pmd = (__pmd); \ | |
2b575eb6 PZ |
103 | anon_vma_lock(__anon_vma); \ |
104 | anon_vma_unlock(__anon_vma); \ | |
71e3aac0 AA |
105 | BUG_ON(pmd_trans_splitting(*____pmd) || \ |
106 | pmd_trans_huge(*____pmd)); \ | |
107 | } while (0) | |
71e3aac0 AA |
108 | #if HPAGE_PMD_ORDER > MAX_ORDER |
109 | #error "hugepages can't be allocated by the buddy allocator" | |
110 | #endif | |
60ab3244 AA |
111 | extern int hugepage_madvise(struct vm_area_struct *vma, |
112 | unsigned long *vm_flags, int advice); | |
94fcc585 AA |
113 | extern void __vma_adjust_trans_huge(struct vm_area_struct *vma, |
114 | unsigned long start, | |
115 | unsigned long end, | |
116 | long adjust_next); | |
025c5b24 NH |
117 | extern int __pmd_trans_huge_lock(pmd_t *pmd, |
118 | struct vm_area_struct *vma); | |
119 | /* mmap_sem must be held on entry */ | |
120 | static inline int pmd_trans_huge_lock(pmd_t *pmd, | |
121 | struct vm_area_struct *vma) | |
122 | { | |
123 | VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem)); | |
124 | if (pmd_trans_huge(*pmd)) | |
125 | return __pmd_trans_huge_lock(pmd, vma); | |
126 | else | |
127 | return 0; | |
128 | } | |
94fcc585 AA |
129 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
130 | unsigned long start, | |
131 | unsigned long end, | |
132 | long adjust_next) | |
133 | { | |
78f11a25 | 134 | if (!vma->anon_vma || vma->vm_ops) |
94fcc585 AA |
135 | return; |
136 | __vma_adjust_trans_huge(vma, start, end, adjust_next); | |
137 | } | |
2c888cfb RR |
138 | static inline int hpage_nr_pages(struct page *page) |
139 | { | |
140 | if (unlikely(PageTransHuge(page))) | |
141 | return HPAGE_PMD_NR; | |
142 | return 1; | |
143 | } | |
22e5c47e AA |
144 | static inline struct page *compound_trans_head(struct page *page) |
145 | { | |
146 | if (PageTail(page)) { | |
147 | struct page *head; | |
148 | head = page->first_page; | |
149 | smp_rmb(); | |
150 | /* | |
151 | * head may be a dangling pointer. | |
152 | * __split_huge_page_refcount clears PageTail before | |
153 | * overwriting first_page, so if PageTail is still | |
154 | * there it means the head pointer isn't dangling. | |
155 | */ | |
156 | if (PageTail(page)) | |
157 | return head; | |
158 | } | |
159 | return page; | |
160 | } | |
71e3aac0 | 161 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
d8c37c48 NH |
162 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) |
163 | #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) | |
164 | #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) | |
71e3aac0 | 165 | |
2c888cfb RR |
166 | #define hpage_nr_pages(x) 1 |
167 | ||
71e3aac0 AA |
168 | #define transparent_hugepage_enabled(__vma) 0 |
169 | ||
170 | #define transparent_hugepage_flags 0UL | |
171 | static inline int split_huge_page(struct page *page) | |
172 | { | |
173 | return 0; | |
174 | } | |
175 | #define split_huge_page_pmd(__mm, __pmd) \ | |
176 | do { } while (0) | |
177 | #define wait_split_huge_page(__anon_vma, __pmd) \ | |
178 | do { } while (0) | |
22e5c47e | 179 | #define compound_trans_head(page) compound_head(page) |
60ab3244 AA |
180 | static inline int hugepage_madvise(struct vm_area_struct *vma, |
181 | unsigned long *vm_flags, int advice) | |
0af4e98b AA |
182 | { |
183 | BUG(); | |
184 | return 0; | |
185 | } | |
94fcc585 AA |
186 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
187 | unsigned long start, | |
188 | unsigned long end, | |
189 | long adjust_next) | |
190 | { | |
191 | } | |
025c5b24 NH |
192 | static inline int pmd_trans_huge_lock(pmd_t *pmd, |
193 | struct vm_area_struct *vma) | |
194 | { | |
195 | return 0; | |
196 | } | |
71e3aac0 AA |
197 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
198 | ||
199 | #endif /* _LINUX_HUGE_MM_H */ |