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Andrea Arcangeli71e3aac2011-01-13 15:46:52 -08001#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);
Johannes Weiner0ca16342011-01-13 15:47:02 -080022extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
23 unsigned long addr, unsigned long end,
24 unsigned char *vec);
Johannes Weinercd7548a2011-01-13 15:47:04 -080025extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
26 unsigned long addr, pgprot_t newprot);
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080027
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,
Andrea Arcangeliba761492011-01-13 15:46:58 -080033 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080034#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) \
Andrea Arcangelia664b2d2011-01-13 15:47:17 -080055 ((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))
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080061#define transparent_hugepage_defrag(__vma) \
62 ((transparent_hugepage_flags & \
63 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
64 (transparent_hugepage_flags & \
65 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
66 (__vma)->vm_flags & VM_HUGEPAGE))
67#ifdef CONFIG_DEBUG_VM
68#define transparent_hugepage_debug_cow() \
69 (transparent_hugepage_flags & \
70 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
71#else /* CONFIG_DEBUG_VM */
72#define transparent_hugepage_debug_cow() 0
73#endif /* CONFIG_DEBUG_VM */
74
75extern unsigned long transparent_hugepage_flags;
76extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
77 pmd_t *dst_pmd, pmd_t *src_pmd,
78 struct vm_area_struct *vma,
79 unsigned long addr, unsigned long end);
80extern int handle_pte_fault(struct mm_struct *mm,
81 struct vm_area_struct *vma, unsigned long address,
82 pte_t *pte, pmd_t *pmd, unsigned int flags);
83extern int split_huge_page(struct page *page);
84extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
85#define split_huge_page_pmd(__mm, __pmd) \
86 do { \
87 pmd_t *____pmd = (__pmd); \
88 if (unlikely(pmd_trans_huge(*____pmd))) \
89 __split_huge_page_pmd(__mm, ____pmd); \
90 } while (0)
91#define wait_split_huge_page(__anon_vma, __pmd) \
92 do { \
93 pmd_t *____pmd = (__pmd); \
94 spin_unlock_wait(&(__anon_vma)->root->lock); \
95 /* \
96 * spin_unlock_wait() is just a loop in C and so the \
97 * CPU can reorder anything around it. \
98 */ \
99 smp_mb(); \
100 BUG_ON(pmd_trans_splitting(*____pmd) || \
101 pmd_trans_huge(*____pmd)); \
102 } while (0)
103#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
104#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
105#if HPAGE_PMD_ORDER > MAX_ORDER
106#error "hugepages can't be allocated by the buddy allocator"
107#endif
Andrea Arcangeli60ab3242011-01-13 15:47:18 -0800108extern int hugepage_madvise(struct vm_area_struct *vma,
109 unsigned long *vm_flags, int advice);
Andrea Arcangeli94fcc582011-01-13 15:47:08 -0800110extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
111 unsigned long start,
112 unsigned long end,
113 long adjust_next);
114static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
115 unsigned long start,
116 unsigned long end,
117 long adjust_next)
118{
119 if (!vma->anon_vma || vma->vm_ops || vma->vm_file)
120 return;
121 __vma_adjust_trans_huge(vma, start, end, adjust_next);
122}
Rik van Riel2c888cf2011-01-13 15:47:13 -0800123static inline int hpage_nr_pages(struct page *page)
124{
125 if (unlikely(PageTransHuge(page)))
126 return HPAGE_PMD_NR;
127 return 1;
128}
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800129#else /* CONFIG_TRANSPARENT_HUGEPAGE */
130#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
131#define HPAGE_PMD_MASK ({ BUG(); 0; })
132#define HPAGE_PMD_SIZE ({ BUG(); 0; })
133
Rik van Riel2c888cf2011-01-13 15:47:13 -0800134#define hpage_nr_pages(x) 1
135
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800136#define transparent_hugepage_enabled(__vma) 0
137
138#define transparent_hugepage_flags 0UL
139static inline int split_huge_page(struct page *page)
140{
141 return 0;
142}
143#define split_huge_page_pmd(__mm, __pmd) \
144 do { } while (0)
145#define wait_split_huge_page(__anon_vma, __pmd) \
146 do { } while (0)
Andrea Arcangeli60ab3242011-01-13 15:47:18 -0800147static inline int hugepage_madvise(struct vm_area_struct *vma,
148 unsigned long *vm_flags, int advice)
Andrea Arcangeli0af4e982011-01-13 15:46:55 -0800149{
150 BUG();
151 return 0;
152}
Andrea Arcangeli94fcc582011-01-13 15:47:08 -0800153static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
154 unsigned long start,
155 unsigned long end,
156 long adjust_next)
157{
158}
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800159#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
160
161#endif /* _LINUX_HUGE_MM_H */