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, unsigned long old_addr, 32 unsigned long new_addr, unsigned long old_end, 33 pmd_t *old_pmd, pmd_t *new_pmd); 34 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 35 unsigned long addr, pgprot_t newprot, 36 int prot_numa); 37 int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *, 38 pfn_t pfn, bool write); 39 enum transparent_hugepage_flag { 40 TRANSPARENT_HUGEPAGE_FLAG, 41 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, 42 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, 43 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, 44 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, 45 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, 46 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, 47 #ifdef CONFIG_DEBUG_VM 48 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, 49 #endif 50 }; 51 52 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) 53 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) 54 55 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 56 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, 57 pmd_t *pmd, int flags); 58 59 #define HPAGE_PMD_SHIFT PMD_SHIFT 60 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) 61 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) 62 63 extern bool is_vma_temporary_stack(struct vm_area_struct *vma); 64 65 #define transparent_hugepage_enabled(__vma) \ 66 ((transparent_hugepage_flags & \ 67 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \ 68 (transparent_hugepage_flags & \ 69 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \ 70 ((__vma)->vm_flags & VM_HUGEPAGE))) && \ 71 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \ 72 !is_vma_temporary_stack(__vma)) 73 #define transparent_hugepage_use_zero_page() \ 74 (transparent_hugepage_flags & \ 75 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) 76 #ifdef CONFIG_DEBUG_VM 77 #define transparent_hugepage_debug_cow() \ 78 (transparent_hugepage_flags & \ 79 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG)) 80 #else /* CONFIG_DEBUG_VM */ 81 #define transparent_hugepage_debug_cow() 0 82 #endif /* CONFIG_DEBUG_VM */ 83 84 extern unsigned long transparent_hugepage_flags; 85 86 extern void prep_transhuge_page(struct page *page); 87 extern void free_transhuge_page(struct page *page); 88 89 int split_huge_page_to_list(struct page *page, struct list_head *list); 90 static inline int split_huge_page(struct page *page) 91 { 92 return split_huge_page_to_list(page, NULL); 93 } 94 void deferred_split_huge_page(struct page *page); 95 96 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 97 unsigned long address, bool freeze); 98 99 #define split_huge_pmd(__vma, __pmd, __address) \ 100 do { \ 101 pmd_t *____pmd = (__pmd); \ 102 if (pmd_trans_huge(*____pmd) \ 103 || pmd_devmap(*____pmd)) \ 104 __split_huge_pmd(__vma, __pmd, __address, \ 105 false); \ 106 } while (0) 107 108 109 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, 110 bool freeze, struct page *page); 111 112 extern int hugepage_madvise(struct vm_area_struct *vma, 113 unsigned long *vm_flags, int advice); 114 extern void vma_adjust_trans_huge(struct vm_area_struct *vma, 115 unsigned long start, 116 unsigned long end, 117 long adjust_next); 118 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, 119 struct vm_area_struct *vma); 120 /* mmap_sem must be held on entry */ 121 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, 122 struct vm_area_struct *vma) 123 { 124 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma); 125 if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) 126 return __pmd_trans_huge_lock(pmd, vma); 127 else 128 return NULL; 129 } 130 static inline int hpage_nr_pages(struct page *page) 131 { 132 if (unlikely(PageTransHuge(page))) 133 return HPAGE_PMD_NR; 134 return 1; 135 } 136 137 extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, 138 unsigned long addr, pmd_t pmd, pmd_t *pmdp); 139 140 extern struct page *huge_zero_page; 141 142 static inline bool is_huge_zero_page(struct page *page) 143 { 144 return ACCESS_ONCE(huge_zero_page) == page; 145 } 146 147 static inline bool is_huge_zero_pmd(pmd_t pmd) 148 { 149 return is_huge_zero_page(pmd_page(pmd)); 150 } 151 152 struct page *get_huge_zero_page(void); 153 void put_huge_zero_page(void); 154 155 #else /* CONFIG_TRANSPARENT_HUGEPAGE */ 156 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) 157 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) 158 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) 159 160 #define hpage_nr_pages(x) 1 161 162 #define transparent_hugepage_enabled(__vma) 0 163 164 #define transparent_hugepage_flags 0UL 165 static inline int 166 split_huge_page_to_list(struct page *page, struct list_head *list) 167 { 168 return 0; 169 } 170 static inline int split_huge_page(struct page *page) 171 { 172 return 0; 173 } 174 static inline void deferred_split_huge_page(struct page *page) {} 175 #define split_huge_pmd(__vma, __pmd, __address) \ 176 do { } while (0) 177 178 static inline void split_huge_pmd_address(struct vm_area_struct *vma, 179 unsigned long address, bool freeze, struct page *page) {} 180 181 static inline int hugepage_madvise(struct vm_area_struct *vma, 182 unsigned long *vm_flags, int advice) 183 { 184 BUG(); 185 return 0; 186 } 187 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 188 unsigned long start, 189 unsigned long end, 190 long adjust_next) 191 { 192 } 193 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, 194 struct vm_area_struct *vma) 195 { 196 return NULL; 197 } 198 199 static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, 200 unsigned long addr, pmd_t pmd, pmd_t *pmdp) 201 { 202 return 0; 203 } 204 205 static inline bool is_huge_zero_page(struct page *page) 206 { 207 return false; 208 } 209 210 static inline void put_huge_zero_page(void) 211 { 212 BUILD_BUG(); 213 } 214 215 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, 216 unsigned long addr, pmd_t *pmd, int flags) 217 { 218 return NULL; 219 } 220 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 221 222 #endif /* _LINUX_HUGE_MM_H */ 223