1#ifndef _LINUX_HUGE_MM_H
2#define _LINUX_HUGE_MM_H
3
4extern 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);
8extern 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);
11extern 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);
14extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
15extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
16 unsigned long addr,
17 pmd_t *pmd,
18 unsigned int flags);
19extern int zap_huge_pmd(struct mmu_gather *tlb,
20 struct vm_area_struct *vma,
21 pmd_t *pmd);
22extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
23 unsigned long addr, unsigned long end,
24 unsigned char *vec);
25extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
26 unsigned long addr, pgprot_t newprot);
27
28enum transparent_hugepage_flag {
29 TRANSPARENT_HUGEPAGE_FLAG,
30 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
31 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
32 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
33 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
34#ifdef CONFIG_DEBUG_VM
35 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
36#endif
37};
38
39enum page_check_address_pmd_flag {
40 PAGE_CHECK_ADDRESS_PMD_FLAG,
41 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
42 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
43};
44extern pmd_t *page_check_address_pmd(struct page *page,
45 struct mm_struct *mm,
46 unsigned long address,
47 enum page_check_address_pmd_flag flag);
48
49#ifdef CONFIG_TRANSPARENT_HUGEPAGE
50#define HPAGE_PMD_SHIFT HPAGE_SHIFT
51#define HPAGE_PMD_MASK HPAGE_MASK
52#define HPAGE_PMD_SIZE HPAGE_SIZE
53
54#define transparent_hugepage_enabled(__vma) \
55 ((transparent_hugepage_flags & \
56 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
57 (transparent_hugepage_flags & \
58 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
59 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
60 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
61 !is_vma_temporary_stack(__vma))
62#define transparent_hugepage_defrag(__vma) \
63 ((transparent_hugepage_flags & \
64 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
65 (transparent_hugepage_flags & \
66 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
67 (__vma)->vm_flags & VM_HUGEPAGE))
68#ifdef CONFIG_DEBUG_VM
69#define transparent_hugepage_debug_cow() \
70 (transparent_hugepage_flags & \
71 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
72#else
73#define transparent_hugepage_debug_cow() 0
74#endif
75
76extern unsigned long transparent_hugepage_flags;
77extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
78 pmd_t *dst_pmd, pmd_t *src_pmd,
79 struct vm_area_struct *vma,
80 unsigned long addr, unsigned long end);
81extern int handle_pte_fault(struct mm_struct *mm,
82 struct vm_area_struct *vma, unsigned long address,
83 pte_t *pte, pmd_t *pmd, unsigned int flags);
84extern int split_huge_page(struct page *page);
85extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
86#define split_huge_page_pmd(__mm, __pmd) \
87 do { \
88 pmd_t *____pmd = (__pmd); \
89 if (unlikely(pmd_trans_huge(*____pmd))) \
90 __split_huge_page_pmd(__mm, ____pmd); \
91 } while (0)
92#define wait_split_huge_page(__anon_vma, __pmd) \
93 do { \
94 pmd_t *____pmd = (__pmd); \
95 spin_unlock_wait(&(__anon_vma)->root->lock); \
96
97
98
99 \
100 smp_mb(); \
101 BUG_ON(pmd_trans_splitting(*____pmd) || \
102 pmd_trans_huge(*____pmd)); \
103 } while (0)
104#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
105#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
106#if HPAGE_PMD_ORDER > MAX_ORDER
107#error "hugepages can't be allocated by the buddy allocator"
108#endif
109extern int hugepage_madvise(struct vm_area_struct *vma,
110 unsigned long *vm_flags, int advice);
111extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
112 unsigned long start,
113 unsigned long end,
114 long adjust_next);
115static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
116 unsigned long start,
117 unsigned long end,
118 long adjust_next)
119{
120 if (!vma->anon_vma || vma->vm_ops || vma->vm_file)
121 return;
122 __vma_adjust_trans_huge(vma, start, end, adjust_next);
123}
124static inline int hpage_nr_pages(struct page *page)
125{
126 if (unlikely(PageTransHuge(page)))
127 return HPAGE_PMD_NR;
128 return 1;
129}
130static inline struct page *compound_trans_head(struct page *page)
131{
132 if (PageTail(page)) {
133 struct page *head;
134 head = page->first_page;
135 smp_rmb();
136
137
138
139
140
141
142 if (PageTail(page))
143 return head;
144 }
145 return page;
146}
147#else
148#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
149#define HPAGE_PMD_MASK ({ BUG(); 0; })
150#define HPAGE_PMD_SIZE ({ BUG(); 0; })
151
152#define hpage_nr_pages(x) 1
153
154#define transparent_hugepage_enabled(__vma) 0
155
156#define transparent_hugepage_flags 0UL
157static inline int split_huge_page(struct page *page)
158{
159 return 0;
160}
161#define split_huge_page_pmd(__mm, __pmd) \
162 do { } while (0)
163#define wait_split_huge_page(__anon_vma, __pmd) \
164 do { } while (0)
165#define compound_trans_head(page) compound_head(page)
166static inline int hugepage_madvise(struct vm_area_struct *vma,
167 unsigned long *vm_flags, int advice)
168{
169 BUG();
170 return 0;
171}
172static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
173 unsigned long start,
174 unsigned long end,
175 long adjust_next)
176{
177}
178#endif
179
180#endif
181
