1 #ifndef _LINUX_HUGE_MM_H
2 #define _LINUX_HUGE_MM_H
4 extern int do_huge_pmd_anonymous_page(struct fault_env *fe);
5 extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
6 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
7 struct vm_area_struct *vma);
8 extern void huge_pmd_set_accessed(struct fault_env *fe, pmd_t orig_pmd);
9 extern int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd);
10 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
14 extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
15 struct vm_area_struct *vma,
16 pmd_t *pmd, unsigned long addr, unsigned long next);
17 extern int zap_huge_pmd(struct mmu_gather *tlb,
18 struct vm_area_struct *vma,
19 pmd_t *pmd, unsigned long addr);
20 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
21 unsigned long addr, unsigned long end,
23 extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
24 unsigned long new_addr, unsigned long old_end,
25 pmd_t *old_pmd, pmd_t *new_pmd, bool *need_flush);
26 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
27 unsigned long addr, pgprot_t newprot,
29 int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
30 pfn_t pfn, bool write);
31 enum transparent_hugepage_flag {
32 TRANSPARENT_HUGEPAGE_FLAG,
33 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
34 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
35 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
36 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
37 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
38 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
39 #ifdef CONFIG_DEBUG_VM
40 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
45 struct kobj_attribute;
47 extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
48 struct kobj_attribute *attr,
49 const char *buf, size_t count,
50 enum transparent_hugepage_flag flag);
51 extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
52 struct kobj_attribute *attr, char *buf,
53 enum transparent_hugepage_flag flag);
54 extern struct kobj_attribute shmem_enabled_attr;
56 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
57 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
59 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
60 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
61 pmd_t *pmd, int flags);
63 #define HPAGE_PMD_SHIFT PMD_SHIFT
64 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
65 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
67 extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
69 #define transparent_hugepage_enabled(__vma) \
70 ((transparent_hugepage_flags & \
71 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
72 (transparent_hugepage_flags & \
73 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
74 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
75 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
76 !is_vma_temporary_stack(__vma))
77 #define transparent_hugepage_use_zero_page() \
78 (transparent_hugepage_flags & \
79 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
80 #ifdef CONFIG_DEBUG_VM
81 #define transparent_hugepage_debug_cow() \
82 (transparent_hugepage_flags & \
83 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
84 #else /* CONFIG_DEBUG_VM */
85 #define transparent_hugepage_debug_cow() 0
86 #endif /* CONFIG_DEBUG_VM */
88 extern unsigned long transparent_hugepage_flags;
90 extern unsigned long thp_get_unmapped_area(struct file *filp,
91 unsigned long addr, unsigned long len, unsigned long pgoff,
94 extern void prep_transhuge_page(struct page *page);
95 extern void free_transhuge_page(struct page *page);
97 int split_huge_page_to_list(struct page *page, struct list_head *list);
98 static inline int split_huge_page(struct page *page)
100 return split_huge_page_to_list(page, NULL);
102 void deferred_split_huge_page(struct page *page);
104 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
105 unsigned long address, bool freeze, struct page *page);
107 #define split_huge_pmd(__vma, __pmd, __address) \
109 pmd_t *____pmd = (__pmd); \
110 if (pmd_trans_huge(*____pmd) \
111 || pmd_devmap(*____pmd)) \
112 __split_huge_pmd(__vma, __pmd, __address, \
117 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
118 bool freeze, struct page *page);
120 extern int hugepage_madvise(struct vm_area_struct *vma,
121 unsigned long *vm_flags, int advice);
122 extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
126 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
127 struct vm_area_struct *vma);
128 /* mmap_sem must be held on entry */
129 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
130 struct vm_area_struct *vma)
132 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
133 if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
134 return __pmd_trans_huge_lock(pmd, vma);
138 static inline int hpage_nr_pages(struct page *page)
140 if (unlikely(PageTransHuge(page)))
145 extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);
147 extern struct page *huge_zero_page;
149 static inline bool is_huge_zero_page(struct page *page)
151 return ACCESS_ONCE(huge_zero_page) == page;
154 static inline bool is_huge_zero_pmd(pmd_t pmd)
156 return is_huge_zero_page(pmd_page(pmd));
159 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
160 void mm_put_huge_zero_page(struct mm_struct *mm);
162 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
164 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
165 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
166 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
167 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
169 #define hpage_nr_pages(x) 1
171 #define transparent_hugepage_enabled(__vma) 0
173 static inline void prep_transhuge_page(struct page *page) {}
175 #define transparent_hugepage_flags 0UL
177 #define thp_get_unmapped_area NULL
180 split_huge_page_to_list(struct page *page, struct list_head *list)
184 static inline int split_huge_page(struct page *page)
188 static inline void deferred_split_huge_page(struct page *page) {}
189 #define split_huge_pmd(__vma, __pmd, __address) \
192 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
193 unsigned long address, bool freeze, struct page *page) {}
194 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
195 unsigned long address, bool freeze, struct page *page) {}
197 static inline int hugepage_madvise(struct vm_area_struct *vma,
198 unsigned long *vm_flags, int advice)
203 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
209 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
210 struct vm_area_struct *vma)
215 static inline int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd)
220 static inline bool is_huge_zero_page(struct page *page)
225 static inline void mm_put_huge_zero_page(struct mm_struct *mm)
230 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
231 unsigned long addr, pmd_t *pmd, int flags)
235 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
237 #endif /* _LINUX_HUGE_MM_H */