1 #ifndef _LINUX_HUGE_MM_H
2 #define _LINUX_HUGE_MM_H
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
,
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 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
);
15 extern int do_huge_pmd_wp_page(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
16 unsigned long address
, pmd_t
*pmd
,
18 extern struct page
*follow_trans_huge_pmd(struct vm_area_struct
*vma
,
22 extern int madvise_free_huge_pmd(struct mmu_gather
*tlb
,
23 struct vm_area_struct
*vma
,
24 pmd_t
*pmd
, unsigned long addr
, unsigned long next
);
25 extern int zap_huge_pmd(struct mmu_gather
*tlb
,
26 struct vm_area_struct
*vma
,
27 pmd_t
*pmd
, unsigned long addr
);
28 extern int mincore_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
29 unsigned long addr
, unsigned long end
,
31 extern bool move_huge_pmd(struct vm_area_struct
*vma
,
32 struct vm_area_struct
*new_vma
,
33 unsigned long old_addr
,
34 unsigned long new_addr
, unsigned long old_end
,
35 pmd_t
*old_pmd
, pmd_t
*new_pmd
);
36 extern int change_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
37 unsigned long addr
, pgprot_t newprot
,
39 int vmf_insert_pfn_pmd(struct vm_area_struct
*, unsigned long addr
, pmd_t
*,
40 pfn_t pfn
, bool write
);
41 enum transparent_hugepage_flag
{
42 TRANSPARENT_HUGEPAGE_FLAG
,
43 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG
,
44 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG
,
45 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG
,
46 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG
,
47 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG
,
48 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG
,
49 #ifdef CONFIG_DEBUG_VM
50 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG
,
54 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
55 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
57 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
58 struct page
*follow_devmap_pmd(struct vm_area_struct
*vma
, unsigned long addr
,
59 pmd_t
*pmd
, int flags
);
61 #define HPAGE_PMD_SHIFT PMD_SHIFT
62 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
63 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
65 extern bool is_vma_temporary_stack(struct vm_area_struct
*vma
);
67 #define transparent_hugepage_enabled(__vma) \
68 ((transparent_hugepage_flags & \
69 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
70 (transparent_hugepage_flags & \
71 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
72 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
73 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
74 !is_vma_temporary_stack(__vma))
75 #define transparent_hugepage_use_zero_page() \
76 (transparent_hugepage_flags & \
77 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
78 #ifdef CONFIG_DEBUG_VM
79 #define transparent_hugepage_debug_cow() \
80 (transparent_hugepage_flags & \
81 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
82 #else /* CONFIG_DEBUG_VM */
83 #define transparent_hugepage_debug_cow() 0
84 #endif /* CONFIG_DEBUG_VM */
86 extern unsigned long transparent_hugepage_flags
;
88 extern void prep_transhuge_page(struct page
*page
);
89 extern void free_transhuge_page(struct page
*page
);
91 int split_huge_page_to_list(struct page
*page
, struct list_head
*list
);
92 static inline int split_huge_page(struct page
*page
)
94 return split_huge_page_to_list(page
, NULL
);
96 void deferred_split_huge_page(struct page
*page
);
98 void __split_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
99 unsigned long address
, bool freeze
);
101 #define split_huge_pmd(__vma, __pmd, __address) \
103 pmd_t *____pmd = (__pmd); \
104 if (pmd_trans_huge(*____pmd) \
105 || pmd_devmap(*____pmd)) \
106 __split_huge_pmd(__vma, __pmd, __address, \
111 void split_huge_pmd_address(struct vm_area_struct
*vma
, unsigned long address
,
112 bool freeze
, struct page
*page
);
114 extern int hugepage_madvise(struct vm_area_struct
*vma
,
115 unsigned long *vm_flags
, int advice
);
116 extern void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
120 extern spinlock_t
*__pmd_trans_huge_lock(pmd_t
*pmd
,
121 struct vm_area_struct
*vma
);
122 /* mmap_sem must be held on entry */
123 static inline spinlock_t
*pmd_trans_huge_lock(pmd_t
*pmd
,
124 struct vm_area_struct
*vma
)
126 VM_BUG_ON_VMA(!rwsem_is_locked(&vma
->vm_mm
->mmap_sem
), vma
);
127 if (pmd_trans_huge(*pmd
) || pmd_devmap(*pmd
))
128 return __pmd_trans_huge_lock(pmd
, vma
);
132 static inline int hpage_nr_pages(struct page
*page
)
134 if (unlikely(PageTransHuge(page
)))
139 extern int do_huge_pmd_numa_page(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
140 unsigned long addr
, pmd_t pmd
, pmd_t
*pmdp
);
142 extern struct page
*huge_zero_page
;
144 static inline bool is_huge_zero_page(struct page
*page
)
146 return ACCESS_ONCE(huge_zero_page
) == page
;
149 static inline bool is_huge_zero_pmd(pmd_t pmd
)
151 return is_huge_zero_page(pmd_page(pmd
));
154 struct page
*get_huge_zero_page(void);
155 void put_huge_zero_page(void);
157 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
158 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
159 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
160 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
162 #define hpage_nr_pages(x) 1
164 #define transparent_hugepage_enabled(__vma) 0
166 #define transparent_hugepage_flags 0UL
168 split_huge_page_to_list(struct page
*page
, struct list_head
*list
)
172 static inline int split_huge_page(struct page
*page
)
176 static inline void deferred_split_huge_page(struct page
*page
) {}
177 #define split_huge_pmd(__vma, __pmd, __address) \
180 static inline void split_huge_pmd_address(struct vm_area_struct
*vma
,
181 unsigned long address
, bool freeze
, struct page
*page
) {}
183 static inline int hugepage_madvise(struct vm_area_struct
*vma
,
184 unsigned long *vm_flags
, int advice
)
189 static inline void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
195 static inline spinlock_t
*pmd_trans_huge_lock(pmd_t
*pmd
,
196 struct vm_area_struct
*vma
)
201 static inline int do_huge_pmd_numa_page(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
202 unsigned long addr
, pmd_t pmd
, pmd_t
*pmdp
)
207 static inline bool is_huge_zero_page(struct page
*page
)
212 static inline void put_huge_zero_page(void)
217 static inline struct page
*follow_devmap_pmd(struct vm_area_struct
*vma
,
218 unsigned long addr
, pmd_t
*pmd
, int flags
)
222 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
224 #endif /* _LINUX_HUGE_MM_H */