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 37 enum transparent_hugepage_flag { 38 TRANSPARENT_HUGEPAGE_FLAG, 39 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, 40 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG, 41 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, 42 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, 43 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, 44 #ifdef CONFIG_DEBUG_VM 45 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, 46 #endif 47 }; 48 49 enum page_check_address_pmd_flag { 50 PAGE_CHECK_ADDRESS_PMD_FLAG, 51 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG, 52 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG, 53 }; 54 extern pmd_t *page_check_address_pmd(struct page *page, 55 struct mm_struct *mm, 56 unsigned long address, 57 enum page_check_address_pmd_flag flag); 58 59 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) 60 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) 61 62 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 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)) 66 67 extern bool is_vma_temporary_stack(struct vm_area_struct *vma); 68 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_defrag(__vma) \ 78 ((transparent_hugepage_flags & \ 79 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \ 80 (transparent_hugepage_flags & \ 81 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \ 82 (__vma)->vm_flags & VM_HUGEPAGE)) 83 #define transparent_hugepage_use_zero_page() \ 84 (transparent_hugepage_flags & \ 85 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) 86 #ifdef CONFIG_DEBUG_VM 87 #define transparent_hugepage_debug_cow() \ 88 (transparent_hugepage_flags & \ 89 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG)) 90 #else /* CONFIG_DEBUG_VM */ 91 #define transparent_hugepage_debug_cow() 0 92 #endif /* CONFIG_DEBUG_VM */ 93 94 extern unsigned long transparent_hugepage_flags; 95 extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, 96 pmd_t *dst_pmd, pmd_t *src_pmd, 97 struct vm_area_struct *vma, 98 unsigned long addr, unsigned long end); 99 extern int split_huge_page_to_list(struct page *page, struct list_head *list); 100 static inline int split_huge_page(struct page *page) 101 { 102 return split_huge_page_to_list(page, NULL); 103 } 104 extern void __split_huge_page_pmd(struct vm_area_struct *vma, 105 unsigned long address, pmd_t *pmd); 106 #define split_huge_page_pmd(__vma, __address, __pmd) \ 107 do { \ 108 pmd_t *____pmd = (__pmd); \ 109 if (unlikely(pmd_trans_huge(*____pmd))) \ 110 __split_huge_page_pmd(__vma, __address, \ 111 ____pmd); \ 112 } while (0) 113 #define wait_split_huge_page(__anon_vma, __pmd) \ 114 do { \ 115 pmd_t *____pmd = (__pmd); \ 116 anon_vma_lock_write(__anon_vma); \ 117 anon_vma_unlock_write(__anon_vma); \ 118 BUG_ON(pmd_trans_splitting(*____pmd) || \ 119 pmd_trans_huge(*____pmd)); \ 120 } while (0) 121 extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address, 122 pmd_t *pmd); 123 #if HPAGE_PMD_ORDER >= MAX_ORDER 124 #error "hugepages can't be allocated by the buddy allocator" 125 #endif 126 extern int hugepage_madvise(struct vm_area_struct *vma, 127 unsigned long *vm_flags, int advice); 128 extern void __vma_adjust_trans_huge(struct vm_area_struct *vma, 129 unsigned long start, 130 unsigned long end, 131 long adjust_next); 132 extern int __pmd_trans_huge_lock(pmd_t *pmd, 133 struct vm_area_struct *vma); 134 /* mmap_sem must be held on entry */ 135 static inline int pmd_trans_huge_lock(pmd_t *pmd, 136 struct vm_area_struct *vma) 137 { 138 VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem)); 139 if (pmd_trans_huge(*pmd)) 140 return __pmd_trans_huge_lock(pmd, vma); 141 else 142 return 0; 143 } 144 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 145 unsigned long start, 146 unsigned long end, 147 long adjust_next) 148 { 149 if (!vma->anon_vma || vma->vm_ops) 150 return; 151 __vma_adjust_trans_huge(vma, start, end, adjust_next); 152 } 153 static inline int hpage_nr_pages(struct page *page) 154 { 155 if (unlikely(PageTransHuge(page))) 156 return HPAGE_PMD_NR; 157 return 1; 158 } 159 static inline struct page *compound_trans_head(struct page *page) 160 { 161 if (PageTail(page)) { 162 struct page *head; 163 head = page->first_page; 164 smp_rmb(); 165 /* 166 * head may be a dangling pointer. 167 * __split_huge_page_refcount clears PageTail before 168 * overwriting first_page, so if PageTail is still 169 * there it means the head pointer isn't dangling. 170 */ 171 if (PageTail(page)) 172 return head; 173 } 174 return page; 175 } 176 177 extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, 178 unsigned long addr, pmd_t pmd, pmd_t *pmdp); 179 180 #else /* CONFIG_TRANSPARENT_HUGEPAGE */ 181 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) 182 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) 183 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) 184 185 #define hpage_nr_pages(x) 1 186 187 #define transparent_hugepage_enabled(__vma) 0 188 189 #define transparent_hugepage_flags 0UL 190 static inline int 191 split_huge_page_to_list(struct page *page, struct list_head *list) 192 { 193 return 0; 194 } 195 static inline int split_huge_page(struct page *page) 196 { 197 return 0; 198 } 199 #define split_huge_page_pmd(__vma, __address, __pmd) \ 200 do { } while (0) 201 #define wait_split_huge_page(__anon_vma, __pmd) \ 202 do { } while (0) 203 #define split_huge_page_pmd_mm(__mm, __address, __pmd) \ 204 do { } while (0) 205 #define compound_trans_head(page) compound_head(page) 206 static inline int hugepage_madvise(struct vm_area_struct *vma, 207 unsigned long *vm_flags, int advice) 208 { 209 BUG(); 210 return 0; 211 } 212 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 213 unsigned long start, 214 unsigned long end, 215 long adjust_next) 216 { 217 } 218 static inline int pmd_trans_huge_lock(pmd_t *pmd, 219 struct vm_area_struct *vma) 220 { 221 return 0; 222 } 223 224 static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, 225 unsigned long addr, pmd_t pmd, pmd_t *pmdp) 226 { 227 return 0; 228 } 229 230 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 231 232 #endif /* _LINUX_HUGE_MM_H */ 233