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 | 62 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
fde52796 AK |
63 | #define HPAGE_PMD_SHIFT PMD_SHIFT |
64 | #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) | |
65 | #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) | |
71e3aac0 | 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); | |
5bc7b8ac SL |
102 | extern int split_huge_page_to_list(struct page *page, struct list_head *list); |
103 | static inline int split_huge_page(struct page *page) | |
104 | { | |
105 | return split_huge_page_to_list(page, NULL); | |
106 | } | |
e180377f KS |
107 | extern void __split_huge_page_pmd(struct vm_area_struct *vma, |
108 | unsigned long address, pmd_t *pmd); | |
109 | #define split_huge_page_pmd(__vma, __address, __pmd) \ | |
71e3aac0 AA |
110 | do { \ |
111 | pmd_t *____pmd = (__pmd); \ | |
112 | if (unlikely(pmd_trans_huge(*____pmd))) \ | |
e180377f KS |
113 | __split_huge_page_pmd(__vma, __address, \ |
114 | ____pmd); \ | |
71e3aac0 AA |
115 | } while (0) |
116 | #define wait_split_huge_page(__anon_vma, __pmd) \ | |
117 | do { \ | |
118 | pmd_t *____pmd = (__pmd); \ | |
4fc3f1d6 | 119 | anon_vma_lock_write(__anon_vma); \ |
08b52706 | 120 | anon_vma_unlock_write(__anon_vma); \ |
71e3aac0 AA |
121 | BUG_ON(pmd_trans_splitting(*____pmd) || \ |
122 | pmd_trans_huge(*____pmd)); \ | |
123 | } while (0) | |
e180377f KS |
124 | extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address, |
125 | pmd_t *pmd); | |
dfa5e237 | 126 | #if HPAGE_PMD_ORDER >= MAX_ORDER |
71e3aac0 AA |
127 | #error "hugepages can't be allocated by the buddy allocator" |
128 | #endif | |
60ab3244 AA |
129 | extern int hugepage_madvise(struct vm_area_struct *vma, |
130 | unsigned long *vm_flags, int advice); | |
94fcc585 AA |
131 | extern void __vma_adjust_trans_huge(struct vm_area_struct *vma, |
132 | unsigned long start, | |
133 | unsigned long end, | |
134 | long adjust_next); | |
025c5b24 NH |
135 | extern int __pmd_trans_huge_lock(pmd_t *pmd, |
136 | struct vm_area_struct *vma); | |
137 | /* mmap_sem must be held on entry */ | |
138 | static inline int pmd_trans_huge_lock(pmd_t *pmd, | |
139 | struct vm_area_struct *vma) | |
140 | { | |
141 | VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem)); | |
142 | if (pmd_trans_huge(*pmd)) | |
143 | return __pmd_trans_huge_lock(pmd, vma); | |
144 | else | |
145 | return 0; | |
146 | } | |
94fcc585 AA |
147 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
148 | unsigned long start, | |
149 | unsigned long end, | |
150 | long adjust_next) | |
151 | { | |
78f11a25 | 152 | if (!vma->anon_vma || vma->vm_ops) |
94fcc585 AA |
153 | return; |
154 | __vma_adjust_trans_huge(vma, start, end, adjust_next); | |
155 | } | |
2c888cfb RR |
156 | static inline int hpage_nr_pages(struct page *page) |
157 | { | |
158 | if (unlikely(PageTransHuge(page))) | |
159 | return HPAGE_PMD_NR; | |
160 | return 1; | |
161 | } | |
22e5c47e AA |
162 | static inline struct page *compound_trans_head(struct page *page) |
163 | { | |
164 | if (PageTail(page)) { | |
165 | struct page *head; | |
166 | head = page->first_page; | |
167 | smp_rmb(); | |
168 | /* | |
169 | * head may be a dangling pointer. | |
170 | * __split_huge_page_refcount clears PageTail before | |
171 | * overwriting first_page, so if PageTail is still | |
172 | * there it means the head pointer isn't dangling. | |
173 | */ | |
174 | if (PageTail(page)) | |
175 | return head; | |
176 | } | |
177 | return page; | |
178 | } | |
d10e63f2 | 179 | |
4daae3b4 MG |
180 | extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
181 | unsigned long addr, pmd_t pmd, pmd_t *pmdp); | |
d10e63f2 | 182 | |
71e3aac0 | 183 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
d8c37c48 NH |
184 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) |
185 | #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) | |
186 | #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) | |
71e3aac0 | 187 | |
2c888cfb RR |
188 | #define hpage_nr_pages(x) 1 |
189 | ||
71e3aac0 AA |
190 | #define transparent_hugepage_enabled(__vma) 0 |
191 | ||
192 | #define transparent_hugepage_flags 0UL | |
5bc7b8ac SL |
193 | static inline int |
194 | split_huge_page_to_list(struct page *page, struct list_head *list) | |
195 | { | |
196 | return 0; | |
197 | } | |
71e3aac0 AA |
198 | static inline int split_huge_page(struct page *page) |
199 | { | |
200 | return 0; | |
201 | } | |
e180377f | 202 | #define split_huge_page_pmd(__vma, __address, __pmd) \ |
71e3aac0 AA |
203 | do { } while (0) |
204 | #define wait_split_huge_page(__anon_vma, __pmd) \ | |
205 | do { } while (0) | |
e180377f KS |
206 | #define split_huge_page_pmd_mm(__mm, __address, __pmd) \ |
207 | do { } while (0) | |
22e5c47e | 208 | #define compound_trans_head(page) compound_head(page) |
60ab3244 AA |
209 | static inline int hugepage_madvise(struct vm_area_struct *vma, |
210 | unsigned long *vm_flags, int advice) | |
0af4e98b AA |
211 | { |
212 | BUG(); | |
213 | return 0; | |
214 | } | |
94fcc585 AA |
215 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
216 | unsigned long start, | |
217 | unsigned long end, | |
218 | long adjust_next) | |
219 | { | |
220 | } | |
025c5b24 NH |
221 | static inline int pmd_trans_huge_lock(pmd_t *pmd, |
222 | struct vm_area_struct *vma) | |
223 | { | |
224 | return 0; | |
225 | } | |
d10e63f2 | 226 | |
4daae3b4 MG |
227 | static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
228 | unsigned long addr, pmd_t pmd, pmd_t *pmdp) | |
d10e63f2 | 229 | { |
4daae3b4 | 230 | return 0; |
d10e63f2 MG |
231 | } |
232 | ||
71e3aac0 AA |
233 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
234 | ||
235 | #endif /* _LINUX_HUGE_MM_H */ |