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 HPAGE_SHIFT 64 #define HPAGE_PMD_MASK HPAGE_MASK 65 #define HPAGE_PMD_SIZE HPAGE_SIZE 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 handle_pte_fault(struct mm_struct *mm, 100 struct vm_area_struct *vma, unsigned long address, 101 pte_t *pte, pmd_t *pmd, unsigned int flags); 102 extern int split_huge_page(struct page *page); 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(__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, 132 struct vm_area_struct *vma); 133 /* mmap_sem must be held on entry */ 134 static inline int pmd_trans_huge_lock(pmd_t *pmd, 135 struct vm_area_struct *vma) 136 { 137 VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem)); 138 if (pmd_trans_huge(*pmd)) 139 return __pmd_trans_huge_lock(pmd, vma); 140 else 141 return 0; 142 } 143 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 144 unsigned long start, 145 unsigned long end, 146 long adjust_next) 147 { 148 if (!vma->anon_vma || vma->vm_ops) 149 return; 150 __vma_adjust_trans_huge(vma, start, end, adjust_next); 151 } 152 static inline int hpage_nr_pages(struct page *page) 153 { 154 if (unlikely(PageTransHuge(page))) 155 return HPAGE_PMD_NR; 156 return 1; 157 } 158 static inline struct page *compound_trans_head(struct page *page) 159 { 160 if (PageTail(page)) { 161 struct page *head; 162 head = page->first_page; 163 smp_rmb(); 164 /* 165 * head may be a dangling pointer. 166 * __split_huge_page_refcount clears PageTail before 167 * overwriting first_page, so if PageTail is still 168 * there it means the head pointer isn't dangling. 169 */ 170 if (PageTail(page)) 171 return head; 172 } 173 return page; 174 } 175 176 extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, 177 unsigned long addr, pmd_t pmd, pmd_t *pmdp); 178 179 #else /* CONFIG_TRANSPARENT_HUGEPAGE */ 180 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) 181 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) 182 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) 183 184 #define hpage_nr_pages(x) 1 185 186 #define transparent_hugepage_enabled(__vma) 0 187 188 #define transparent_hugepage_flags 0UL 189 static inline int split_huge_page(struct page *page) 190 { 191 return 0; 192 } 193 #define split_huge_page_pmd(__vma, __address, __pmd) \ 194 do { } while (0) 195 #define wait_split_huge_page(__anon_vma, __pmd) \ 196 do { } while (0) 197 #define split_huge_page_pmd_mm(__mm, __address, __pmd) \ 198 do { } while (0) 199 #define compound_trans_head(page) compound_head(page) 200 static inline int hugepage_madvise(struct vm_area_struct *vma, 201 unsigned long *vm_flags, int advice) 202 { 203 BUG(); 204 return 0; 205 } 206 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 207 unsigned long start, 208 unsigned long end, 209 long adjust_next) 210 { 211 } 212 static inline int pmd_trans_huge_lock(pmd_t *pmd, 213 struct vm_area_struct *vma) 214 { 215 return 0; 216 } 217 218 static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, 219 unsigned long addr, pmd_t pmd, pmd_t *pmdp) 220 { 221 return 0; 222 } 223 224 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 225 226 #endif /* _LINUX_HUGE_MM_H */ 227