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 zap_huge_pmd(struct mmu_gather *tlb, 23 struct vm_area_struct *vma, 24 pmd_t *pmd, unsigned long addr); 25 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 26 unsigned long addr, unsigned long end, 27 unsigned char *vec); 28 extern int move_huge_pmd(struct vm_area_struct *vma, 29 struct vm_area_struct *new_vma, 30 unsigned long old_addr, 31 unsigned long new_addr, unsigned long old_end, 32 pmd_t *old_pmd, pmd_t *new_pmd); 33 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 34 unsigned long addr, pgprot_t newprot, 35 int prot_numa); 36 int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *, 37 unsigned long pfn, bool write); 38 39 enum transparent_hugepage_flag { 40 TRANSPARENT_HUGEPAGE_FLAG, 41 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, 42 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG, 43 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, 44 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, 45 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, 46 #ifdef CONFIG_DEBUG_VM 47 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, 48 #endif 49 }; 50 51 enum page_check_address_pmd_flag { 52 PAGE_CHECK_ADDRESS_PMD_FLAG, 53 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG, 54 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG, 55 }; 56 extern pmd_t *page_check_address_pmd(struct page *page, 57 struct mm_struct *mm, 58 unsigned long address, 59 enum page_check_address_pmd_flag flag, 60 spinlock_t **ptl); 61 62 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) 63 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) 64 65 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 66 #define HPAGE_PMD_SHIFT PMD_SHIFT 67 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) 68 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) 69 70 extern bool is_vma_temporary_stack(struct vm_area_struct *vma); 71 72 #define transparent_hugepage_enabled(__vma) \ 73 ((transparent_hugepage_flags & \ 74 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \ 75 (transparent_hugepage_flags & \ 76 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \ 77 ((__vma)->vm_flags & VM_HUGEPAGE))) && \ 78 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \ 79 !is_vma_temporary_stack(__vma)) 80 #define transparent_hugepage_defrag(__vma) \ 81 ((transparent_hugepage_flags & \ 82 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \ 83 (transparent_hugepage_flags & \ 84 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \ 85 (__vma)->vm_flags & VM_HUGEPAGE)) 86 #define transparent_hugepage_use_zero_page() \ 87 (transparent_hugepage_flags & \ 88 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) 89 #ifdef CONFIG_DEBUG_VM 90 #define transparent_hugepage_debug_cow() \ 91 (transparent_hugepage_flags & \ 92 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG)) 93 #else /* CONFIG_DEBUG_VM */ 94 #define transparent_hugepage_debug_cow() 0 95 #endif /* CONFIG_DEBUG_VM */ 96 97 extern unsigned long transparent_hugepage_flags; 98 extern int split_huge_page_to_list(struct page *page, struct list_head *list); 99 static inline int split_huge_page(struct page *page) 100 { 101 return split_huge_page_to_list(page, NULL); 102 } 103 extern void __split_huge_page_pmd(struct vm_area_struct *vma, 104 unsigned long address, pmd_t *pmd); 105 #define split_huge_page_pmd(__vma, __address, __pmd) \ 106 do { \ 107 pmd_t *____pmd = (__pmd); \ 108 if (unlikely(pmd_trans_huge(*____pmd))) \ 109 __split_huge_page_pmd(__vma, __address, \ 110 ____pmd); \ 111 } while (0) 112 #define wait_split_huge_page(__anon_vma, __pmd) \ 113 do { \ 114 pmd_t *____pmd = (__pmd); \ 115 anon_vma_lock_write(__anon_vma); \ 116 anon_vma_unlock_write(__anon_vma); \ 117 BUG_ON(pmd_trans_splitting(*____pmd) || \ 118 pmd_trans_huge(*____pmd)); \ 119 } while (0) 120 extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address, 121 pmd_t *pmd); 122 #if HPAGE_PMD_ORDER >= MAX_ORDER 123 #error "hugepages can't be allocated by the buddy allocator" 124 #endif 125 extern int hugepage_madvise(struct vm_area_struct *vma, 126 unsigned long *vm_flags, int advice); 127 extern void vma_adjust_trans_huge(struct vm_area_struct *vma, 128 unsigned long start, 129 unsigned long end, 130 long adjust_next); 131 extern int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, 132 spinlock_t **ptl); 133 /* mmap_sem must be held on entry */ 134 static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, 135 spinlock_t **ptl) 136 { 137 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma); 138 if (pmd_trans_huge(*pmd)) 139 return __pmd_trans_huge_lock(pmd, vma, ptl); 140 else 141 return 0; 142 } 143 static inline int hpage_nr_pages(struct page *page) 144 { 145 if (unlikely(PageTransHuge(page))) 146 return HPAGE_PMD_NR; 147 return 1; 148 } 149 150 extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, 151 unsigned long addr, pmd_t pmd, pmd_t *pmdp); 152 153 extern struct page *huge_zero_page; 154 155 static inline bool is_huge_zero_page(struct page *page) 156 { 157 return ACCESS_ONCE(huge_zero_page) == page; 158 } 159 160 static inline bool is_huge_zero_pmd(pmd_t pmd) 161 { 162 return is_huge_zero_page(pmd_page(pmd)); 163 } 164 165 struct page *get_huge_zero_page(void); 166 167 #else /* CONFIG_TRANSPARENT_HUGEPAGE */ 168 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) 169 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) 170 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) 171 172 #define hpage_nr_pages(x) 1 173 174 #define transparent_hugepage_enabled(__vma) 0 175 176 #define transparent_hugepage_flags 0UL 177 static inline int 178 split_huge_page_to_list(struct page *page, struct list_head *list) 179 { 180 return 0; 181 } 182 static inline int split_huge_page(struct page *page) 183 { 184 return 0; 185 } 186 #define split_huge_page_pmd(__vma, __address, __pmd) \ 187 do { } while (0) 188 #define wait_split_huge_page(__anon_vma, __pmd) \ 189 do { } while (0) 190 #define split_huge_page_pmd_mm(__mm, __address, __pmd) \ 191 do { } while (0) 192 static inline int hugepage_madvise(struct vm_area_struct *vma, 193 unsigned long *vm_flags, int advice) 194 { 195 BUG(); 196 return 0; 197 } 198 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 199 unsigned long start, 200 unsigned long end, 201 long adjust_next) 202 { 203 } 204 static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, 205 spinlock_t **ptl) 206 { 207 return 0; 208 } 209 210 static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, 211 unsigned long addr, pmd_t pmd, pmd_t *pmdp) 212 { 213 return 0; 214 } 215 216 static inline bool is_huge_zero_page(struct page *page) 217 { 218 return false; 219 } 220 221 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 222 223 #endif /* _LINUX_HUGE_MM_H */ 224