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, unsigned long old_addr,
32 unsigned long new_addr, unsigned long old_end,
33 pmd_t *old_pmd, pmd_t *new_pmd);
34 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
35 unsigned long addr, pgprot_t newprot,
37 int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
38 pfn_t pfn, bool write);
39 enum transparent_hugepage_flag {
40 TRANSPARENT_HUGEPAGE_FLAG,
41 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
42 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
43 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
44 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
45 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
46 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
47 #ifdef CONFIG_DEBUG_VM
48 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
52 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
53 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
55 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
56 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
57 pmd_t *pmd, int flags);
59 #define HPAGE_PMD_SHIFT PMD_SHIFT
60 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
61 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
63 extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
65 #define transparent_hugepage_enabled(__vma) \
66 ((transparent_hugepage_flags & \
67 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
68 (transparent_hugepage_flags & \
69 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
70 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
71 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
72 !is_vma_temporary_stack(__vma))
73 #define transparent_hugepage_use_zero_page() \
74 (transparent_hugepage_flags & \
75 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
76 #ifdef CONFIG_DEBUG_VM
77 #define transparent_hugepage_debug_cow() \
78 (transparent_hugepage_flags & \
79 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
80 #else /* CONFIG_DEBUG_VM */
81 #define transparent_hugepage_debug_cow() 0
82 #endif /* CONFIG_DEBUG_VM */
84 extern unsigned long transparent_hugepage_flags;
86 extern void prep_transhuge_page(struct page *page);
87 extern void free_transhuge_page(struct page *page);
89 int split_huge_page_to_list(struct page *page, struct list_head *list);
90 static inline int split_huge_page(struct page *page)
92 return split_huge_page_to_list(page, NULL);
94 void deferred_split_huge_page(struct page *page);
96 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
97 unsigned long address, bool freeze, struct page *page);
99 #define split_huge_pmd(__vma, __pmd, __address) \
101 pmd_t *____pmd = (__pmd); \
102 if (pmd_trans_huge(*____pmd) \
103 || pmd_devmap(*____pmd)) \
104 __split_huge_pmd(__vma, __pmd, __address, \
109 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
110 bool freeze, struct page *page);
112 extern int hugepage_madvise(struct vm_area_struct *vma,
113 unsigned long *vm_flags, int advice);
114 extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
118 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
119 struct vm_area_struct *vma);
120 /* mmap_sem must be held on entry */
121 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
122 struct vm_area_struct *vma)
124 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
125 if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
126 return __pmd_trans_huge_lock(pmd, vma);
130 static inline int hpage_nr_pages(struct page *page)
132 if (unlikely(PageTransHuge(page)))
137 extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
138 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
140 extern struct page *huge_zero_page;
142 static inline bool is_huge_zero_page(struct page *page)
144 return ACCESS_ONCE(huge_zero_page) == page;
147 static inline bool is_huge_zero_pmd(pmd_t pmd)
149 return is_huge_zero_page(pmd_page(pmd));
152 struct page *get_huge_zero_page(void);
153 void put_huge_zero_page(void);
155 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
156 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
157 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
158 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
160 #define hpage_nr_pages(x) 1
162 #define transparent_hugepage_enabled(__vma) 0
164 #define transparent_hugepage_flags 0UL
166 split_huge_page_to_list(struct page *page, struct list_head *list)
170 static inline int split_huge_page(struct page *page)
174 static inline void deferred_split_huge_page(struct page *page) {}
175 #define split_huge_pmd(__vma, __pmd, __address) \
178 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
179 unsigned long address, bool freeze, struct page *page) {}
181 static inline int hugepage_madvise(struct vm_area_struct *vma,
182 unsigned long *vm_flags, int advice)
187 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
193 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
194 struct vm_area_struct *vma)
199 static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
200 unsigned long addr, pmd_t pmd, pmd_t *pmdp)
205 static inline bool is_huge_zero_page(struct page *page)
210 static inline void put_huge_zero_page(void)
215 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
216 unsigned long addr, pmd_t *pmd, int flags)
220 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
222 #endif /* _LINUX_HUGE_MM_H */