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,
21 pmd_t *pmd, unsigned long addr);
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);
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);
30 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
31 unsigned long addr, pgprot_t newprot);
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,
38 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
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
54 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
55 #define HPAGE_PMD_SHIFT HPAGE_SHIFT
56 #define HPAGE_PMD_MASK HPAGE_MASK
57 #define HPAGE_PMD_SIZE HPAGE_SIZE
58
59 #define transparent_hugepage_enabled(__vma) \
60 ((transparent_hugepage_flags & \
61 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
62 (transparent_hugepage_flags & \
63 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
64 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
65 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
66 !is_vma_temporary_stack(__vma))
67 #define transparent_hugepage_defrag(__vma) \
68 ((transparent_hugepage_flags & \
69 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
70 (transparent_hugepage_flags & \
71 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
72 (__vma)->vm_flags & VM_HUGEPAGE))
73 #ifdef CONFIG_DEBUG_VM
74 #define transparent_hugepage_debug_cow() \
75 (transparent_hugepage_flags & \
76 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
77 #else /* CONFIG_DEBUG_VM */
78 #define transparent_hugepage_debug_cow() 0
79 #endif /* CONFIG_DEBUG_VM */
80
81 extern unsigned long transparent_hugepage_flags;
82 extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
83 pmd_t *dst_pmd, pmd_t *src_pmd,
84 struct vm_area_struct *vma,
85 unsigned long addr, unsigned long end);
86 extern int handle_pte_fault(struct mm_struct *mm,
87 struct vm_area_struct *vma, unsigned long address,
88 pte_t *pte, pmd_t *pmd, unsigned int flags);
89 extern int split_huge_page(struct page *page);
90 extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
91 #define split_huge_page_pmd(__mm, __pmd) \
92 do { \
93 pmd_t *____pmd = (__pmd); \
94 if (unlikely(pmd_trans_huge(*____pmd))) \
95 __split_huge_page_pmd(__mm, ____pmd); \
96 } while (0)
97 #define wait_split_huge_page(__anon_vma, __pmd) \
98 do { \
99 pmd_t *____pmd = (__pmd); \
100 anon_vma_lock(__anon_vma); \
101 anon_vma_unlock(__anon_vma); \
102 BUG_ON(pmd_trans_splitting(*____pmd) || \
103 pmd_trans_huge(*____pmd)); \
104 } while (0)
105 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
106 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
107 #if HPAGE_PMD_ORDER > MAX_ORDER
108 #error "hugepages can't be allocated by the buddy allocator"
109 #endif
110 extern int hugepage_madvise(struct vm_area_struct *vma,
111 unsigned long *vm_flags, int advice);
112 extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
113 unsigned long start,
114 unsigned long end,
115 long adjust_next);
vma_adjust_trans_huge(struct vm_area_struct * vma,unsigned long start,unsigned long end,long adjust_next)116 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
117 unsigned long start,
118 unsigned long end,
119 long adjust_next)
120 {
121 if (!vma->anon_vma || vma->vm_ops)
122 return;
123 __vma_adjust_trans_huge(vma, start, end, adjust_next);
124 }
hpage_nr_pages(struct page * page)125 static inline int hpage_nr_pages(struct page *page)
126 {
127 if (unlikely(PageTransHuge(page)))
128 return HPAGE_PMD_NR;
129 return 1;
130 }
compound_trans_head(struct page * page)131 static inline struct page *compound_trans_head(struct page *page)
132 {
133 if (PageTail(page)) {
134 struct page *head;
135 head = page->first_page;
136 smp_rmb();
137 /*
138 * head may be a dangling pointer.
139 * __split_huge_page_refcount clears PageTail before
140 * overwriting first_page, so if PageTail is still
141 * there it means the head pointer isn't dangling.
142 */
143 if (PageTail(page))
144 return head;
145 }
146 return page;
147 }
148 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
149 #define HPAGE_PMD_SHIFT ({ BUG(); 0; })
150 #define HPAGE_PMD_MASK ({ BUG(); 0; })
151 #define HPAGE_PMD_SIZE ({ BUG(); 0; })
152
153 #define hpage_nr_pages(x) 1
154
155 #define transparent_hugepage_enabled(__vma) 0
156
157 #define transparent_hugepage_flags 0UL
split_huge_page(struct page * page)158 static inline int split_huge_page(struct page *page)
159 {
160 return 0;
161 }
162 #define split_huge_page_pmd(__mm, __pmd) \
163 do { } while (0)
164 #define wait_split_huge_page(__anon_vma, __pmd) \
165 do { } while (0)
166 #define compound_trans_head(page) compound_head(page)
hugepage_madvise(struct vm_area_struct * vma,unsigned long * vm_flags,int advice)167 static inline int hugepage_madvise(struct vm_area_struct *vma,
168 unsigned long *vm_flags, int advice)
169 {
170 BUG();
171 return 0;
172 }
vma_adjust_trans_huge(struct vm_area_struct * vma,unsigned long start,unsigned long end,long adjust_next)173 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
174 unsigned long start,
175 unsigned long end,
176 long adjust_next)
177 {
178 }
179 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
180
181 #endif /* _LINUX_HUGE_MM_H */
182