include/linux/huge_mm.h

   1 #ifndef _LINUX_HUGE_MM_H
   2 #define _LINUX_HUGE_MM_H
   3
   4 extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf);
   5 extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
   6                          pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
   7                          struct vm_area_struct *vma);
   8 extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
   9 extern int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
  10                          pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
  11                          struct vm_area_struct *vma);
  12
  13 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
  14 extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
  15 #else
  16 static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
  17 {
  18 }
  19 #endif
  20
  21 extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
  22 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
  23                                           unsigned long addr,
  24                                           pmd_t *pmd,
  25                                           unsigned int flags);
  26 extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
  27                         struct vm_area_struct *vma,
  28                         pmd_t *pmd, unsigned long addr, unsigned long next);
  29 extern int zap_huge_pmd(struct mmu_gather *tlb,
  30                         struct vm_area_struct *vma,
  31                         pmd_t *pmd, unsigned long addr);
  32 extern int zap_huge_pud(struct mmu_gather *tlb,
  33                         struct vm_area_struct *vma,
  34                         pud_t *pud, unsigned long addr);
  35 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  36                         unsigned long addr, unsigned long end,
  37                         unsigned char *vec);
  38 extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
  39                          unsigned long new_addr, unsigned long old_end,
  40                          pmd_t *old_pmd, pmd_t *new_pmd, bool *need_flush);
  41 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  42                         unsigned long addr, pgprot_t newprot,
  43                         int prot_numa);
  44 int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
  45                         pmd_t *pmd, pfn_t pfn, bool write);
  46 int vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
  47                         pud_t *pud, pfn_t pfn, bool write);
  48 enum transparent_hugepage_flag {
  49         TRANSPARENT_HUGEPAGE_FLAG,
  50         TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
  51         TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
  52         TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
  53         TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
  54         TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
  55         TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
  56         TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
  57 #ifdef CONFIG_DEBUG_VM
  58         TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
  59 #endif
  60 };
  61
  62 struct kobject;
  63 struct kobj_attribute;
  64
  65 extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
  66                                  struct kobj_attribute *attr,
  67                                  const char *buf, size_t count,
  68                                  enum transparent_hugepage_flag flag);
  69 extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
  70                                 struct kobj_attribute *attr, char *buf,
  71                                 enum transparent_hugepage_flag flag);
  72 extern struct kobj_attribute shmem_enabled_attr;
  73
  74 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
  75 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
  76
  77 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  78 #define HPAGE_PMD_SHIFT PMD_SHIFT
  79 #define HPAGE_PMD_SIZE  ((1UL) << HPAGE_PMD_SHIFT)
  80 #define HPAGE_PMD_MASK  (~(HPAGE_PMD_SIZE - 1))
  81
  82 #define HPAGE_PUD_SHIFT PUD_SHIFT
  83 #define HPAGE_PUD_SIZE  ((1UL) << HPAGE_PUD_SHIFT)
  84 #define HPAGE_PUD_MASK  (~(HPAGE_PUD_SIZE - 1))
  85
  86 extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
  87
  88 #define transparent_hugepage_enabled(__vma)                             \
  89         ((transparent_hugepage_flags &                                  \
  90           (1<<TRANSPARENT_HUGEPAGE_FLAG) ||                             \
  91           (transparent_hugepage_flags &                                 \
  92            (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) &&                   \
  93            ((__vma)->vm_flags & VM_HUGEPAGE))) &&                       \
  94          !((__vma)->vm_flags & VM_NOHUGEPAGE) &&                        \
  95          !is_vma_temporary_stack(__vma))
  96 #define transparent_hugepage_use_zero_page()                            \
  97         (transparent_hugepage_flags &                                   \
  98          (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
  99 #ifdef CONFIG_DEBUG_VM
 100 #define transparent_hugepage_debug_cow()                                \
 101         (transparent_hugepage_flags &                                   \
 102          (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
 103 #else /* CONFIG_DEBUG_VM */
 104 #define transparent_hugepage_debug_cow() 0
 105 #endif /* CONFIG_DEBUG_VM */
 106
 107 extern unsigned long transparent_hugepage_flags;
 108
 109 extern unsigned long thp_get_unmapped_area(struct file *filp,
 110                 unsigned long addr, unsigned long len, unsigned long pgoff,
 111                 unsigned long flags);
 112
 113 extern void prep_transhuge_page(struct page *page);
 114 extern void free_transhuge_page(struct page *page);
 115
 116 int split_huge_page_to_list(struct page *page, struct list_head *list);
 117 static inline int split_huge_page(struct page *page)
 118 {
 119         return split_huge_page_to_list(page, NULL);
 120 }
 121 void deferred_split_huge_page(struct page *page);
 122
 123 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 124                 unsigned long address, bool freeze, struct page *page);
 125
 126 #define split_huge_pmd(__vma, __pmd, __address)                         \
 127         do {                                                            \
 128                 pmd_t *____pmd = (__pmd);                               \
 129                 if (pmd_trans_huge(*____pmd)                            \
 130                                         || pmd_devmap(*____pmd))        \
 131                         __split_huge_pmd(__vma, __pmd, __address,       \
 132                                                 false, NULL);           \
 133         }  while (0)
 134
 135
 136 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
 137                 bool freeze, struct page *page);
 138
 139 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
 140                 unsigned long address);
 141
 142 #define split_huge_pud(__vma, __pud, __address)                         \
 143         do {                                                            \
 144                 pud_t *____pud = (__pud);                               \
 145                 if (pud_trans_huge(*____pud)                            \
 146                                         || pud_devmap(*____pud))        \
 147                         __split_huge_pud(__vma, __pud, __address);      \
 148         }  while (0)
 149
 150 extern int hugepage_madvise(struct vm_area_struct *vma,
 151                             unsigned long *vm_flags, int advice);
 152 extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
 153                                     unsigned long start,
 154                                     unsigned long end,
 155                                     long adjust_next);
 156 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
 157                 struct vm_area_struct *vma);
 158 extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
 159                 struct vm_area_struct *vma);
 160 /* mmap_sem must be held on entry */
 161 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
 162                 struct vm_area_struct *vma)
 163 {
 164         VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
 165         if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
 166                 return __pmd_trans_huge_lock(pmd, vma);
 167         else
 168                 return NULL;
 169 }
 170 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
 171                 struct vm_area_struct *vma)
 172 {
 173         VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
 174         if (pud_trans_huge(*pud) || pud_devmap(*pud))
 175                 return __pud_trans_huge_lock(pud, vma);
 176         else
 177                 return NULL;
 178 }
 179 static inline int hpage_nr_pages(struct page *page)
 180 {
 181         if (unlikely(PageTransHuge(page)))
 182                 return HPAGE_PMD_NR;
 183         return 1;
 184 }
 185
 186 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
 187                 pmd_t *pmd, int flags);
 188 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
 189                 pud_t *pud, int flags);
 190
 191 extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
 192
 193 extern struct page *huge_zero_page;
 194
 195 static inline bool is_huge_zero_page(struct page *page)
 196 {
 197         return ACCESS_ONCE(huge_zero_page) == page;
 198 }
 199
 200 static inline bool is_huge_zero_pmd(pmd_t pmd)
 201 {
 202         return is_huge_zero_page(pmd_page(pmd));
 203 }
 204
 205 static inline bool is_huge_zero_pud(pud_t pud)
 206 {
 207         return false;
 208 }
 209
 210 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
 211 void mm_put_huge_zero_page(struct mm_struct *mm);
 212
 213 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
 214
 215 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 216 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
 217 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
 218 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
 219
 220 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
 221 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
 222 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
 223
 224 #define hpage_nr_pages(x) 1
 225
 226 #define transparent_hugepage_enabled(__vma) 0
 227
 228 static inline void prep_transhuge_page(struct page *page) {}
 229
 230 #define transparent_hugepage_flags 0UL
 231
 232 #define thp_get_unmapped_area   NULL
 233
 234 static inline int
 235 split_huge_page_to_list(struct page *page, struct list_head *list)
 236 {
 237         return 0;
 238 }
 239 static inline int split_huge_page(struct page *page)
 240 {
 241         return 0;
 242 }
 243 static inline void deferred_split_huge_page(struct page *page) {}
 244 #define split_huge_pmd(__vma, __pmd, __address) \
 245         do { } while (0)
 246
 247 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 248                 unsigned long address, bool freeze, struct page *page) {}
 249 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
 250                 unsigned long address, bool freeze, struct page *page) {}
 251
 252 #define split_huge_pud(__vma, __pmd, __address) \
 253         do { } while (0)
 254
 255 static inline int hugepage_madvise(struct vm_area_struct *vma,
 256                                    unsigned long *vm_flags, int advice)
 257 {
 258         BUG();
 259         return 0;
 260 }
 261 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 262                                          unsigned long start,
 263                                          unsigned long end,
 264                                          long adjust_next)
 265 {
 266 }
 267 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
 268                 struct vm_area_struct *vma)
 269 {
 270         return NULL;
 271 }
 272 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
 273                 struct vm_area_struct *vma)
 274 {
 275         return NULL;
 276 }
 277
 278 static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
 279 {
 280         return 0;
 281 }
 282
 283 static inline bool is_huge_zero_page(struct page *page)
 284 {
 285         return false;
 286 }
 287
 288 static inline bool is_huge_zero_pud(pud_t pud)
 289 {
 290         return false;
 291 }
 292
 293 static inline void mm_put_huge_zero_page(struct mm_struct *mm)
 294 {
 295         return;
 296 }
 297
 298 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
 299                 unsigned long addr, pmd_t *pmd, int flags)
 300 {
 301         return NULL;
 302 }
 303
 304 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
 305                 unsigned long addr, pud_t *pud, int flags)
 306 {
 307         return NULL;
 308 }
 309 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 310
 311 #endif /* _LINUX_HUGE_MM_H */