1 #ifndef _LINUX_HUGE_MM_H 2 #define _LINUX_HUGE_MM_H 3 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, 7 unsigned int flags); 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, 17 pmd_t orig_pmd); 18 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, 19 unsigned long addr, 20 pmd_t *pmd, 21 unsigned int flags); 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, 30 unsigned char *vec); 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, 38 int prot_numa); 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, 51 #endif 52 }; 53 54 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) 55 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) 56 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); 60 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)) 64 65 extern bool is_vma_temporary_stack(struct vm_area_struct *vma); 66 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 */ 85 86 extern unsigned long transparent_hugepage_flags; 87 88 extern void prep_transhuge_page(struct page *page); 89 extern void free_transhuge_page(struct page *page); 90 91 int split_huge_page_to_list(struct page *page, struct list_head *list); 92 static inline int split_huge_page(struct page *page) 93 { 94 return split_huge_page_to_list(page, NULL); 95 } 96 void deferred_split_huge_page(struct page *page); 97 98 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 99 unsigned long address, bool freeze); 100 101 #define split_huge_pmd(__vma, __pmd, __address) \ 102 do { \ 103 pmd_t *____pmd = (__pmd); \ 104 if (pmd_trans_huge(*____pmd) \ 105 || pmd_devmap(*____pmd)) \ 106 __split_huge_pmd(__vma, __pmd, __address, \ 107 false); \ 108 } while (0) 109 110 111 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, 112 bool freeze, struct page *page); 113 114 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, 117 unsigned long start, 118 unsigned long end, 119 long adjust_next); 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) 125 { 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); 129 else 130 return NULL; 131 } 132 static inline int hpage_nr_pages(struct page *page) 133 { 134 if (unlikely(PageTransHuge(page))) 135 return HPAGE_PMD_NR; 136 return 1; 137 } 138 139 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); 141 142 extern struct page *huge_zero_page; 143 144 static inline bool is_huge_zero_page(struct page *page) 145 { 146 return ACCESS_ONCE(huge_zero_page) == page; 147 } 148 149 static inline bool is_huge_zero_pmd(pmd_t pmd) 150 { 151 return is_huge_zero_page(pmd_page(pmd)); 152 } 153 154 struct page *get_huge_zero_page(void); 155 void put_huge_zero_page(void); 156 157 #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; }) 161 162 #define hpage_nr_pages(x) 1 163 164 #define transparent_hugepage_enabled(__vma) 0 165 166 #define transparent_hugepage_flags 0UL 167 static inline int 168 split_huge_page_to_list(struct page *page, struct list_head *list) 169 { 170 return 0; 171 } 172 static inline int split_huge_page(struct page *page) 173 { 174 return 0; 175 } 176 static inline void deferred_split_huge_page(struct page *page) {} 177 #define split_huge_pmd(__vma, __pmd, __address) \ 178 do { } while (0) 179 180 static inline void split_huge_pmd_address(struct vm_area_struct *vma, 181 unsigned long address, bool freeze, struct page *page) {} 182 183 static inline int hugepage_madvise(struct vm_area_struct *vma, 184 unsigned long *vm_flags, int advice) 185 { 186 BUG(); 187 return 0; 188 } 189 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 190 unsigned long start, 191 unsigned long end, 192 long adjust_next) 193 { 194 } 195 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, 196 struct vm_area_struct *vma) 197 { 198 return NULL; 199 } 200 201 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) 203 { 204 return 0; 205 } 206 207 static inline bool is_huge_zero_page(struct page *page) 208 { 209 return false; 210 } 211 212 static inline void put_huge_zero_page(void) 213 { 214 BUILD_BUG(); 215 } 216 217 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, 218 unsigned long addr, pmd_t *pmd, int flags) 219 { 220 return NULL; 221 } 222 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 223 224 #endif /* _LINUX_HUGE_MM_H */ 225