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 bool can_split_huge_page(struct page *page, int *pextra_pins);
 117 int split_huge_page_to_list(struct page *page, struct list_head *list);
 118 static inline int split_huge_page(struct page *page)
 119 {
 120         return split_huge_page_to_list(page, NULL);
 121 }
 122 void deferred_split_huge_page(struct page *page);
 123
 124 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 125                 unsigned long address, bool freeze, struct page *page);
 126
 127 #define split_huge_pmd(__vma, __pmd, __address)                         \
 128         do {                                                            \
 129                 pmd_t *____pmd = (__pmd);                               \
 130                 if (pmd_trans_huge(*____pmd)                            \
 131                                         || pmd_devmap(*____pmd))        \
 132                         __split_huge_pmd(__vma, __pmd, __address,       \
 133                                                 false, NULL);           \
 134         }  while (0)
 135
 136
 137 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
 138                 bool freeze, struct page *page);
 139
 140 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
 141                 unsigned long address);
 142
 143 #define split_huge_pud(__vma, __pud, __address)                         \
 144         do {                                                            \
 145                 pud_t *____pud = (__pud);                               \
 146                 if (pud_trans_huge(*____pud)                            \
 147                                         || pud_devmap(*____pud))        \
 148                         __split_huge_pud(__vma, __pud, __address);      \
 149         }  while (0)
 150
 151 extern int hugepage_madvise(struct vm_area_struct *vma,
 152                             unsigned long *vm_flags, int advice);
 153 extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
 154                                     unsigned long start,
 155                                     unsigned long end,
 156                                     long adjust_next);
 157 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
 158                 struct vm_area_struct *vma);
 159 extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
 160                 struct vm_area_struct *vma);
 161 /* mmap_sem must be held on entry */
 162 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
 163                 struct vm_area_struct *vma)
 164 {
 165         VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
 166         if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
 167                 return __pmd_trans_huge_lock(pmd, vma);
 168         else
 169                 return NULL;
 170 }
 171 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
 172                 struct vm_area_struct *vma)
 173 {
 174         VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
 175         if (pud_trans_huge(*pud) || pud_devmap(*pud))
 176                 return __pud_trans_huge_lock(pud, vma);
 177         else
 178                 return NULL;
 179 }
 180 static inline int hpage_nr_pages(struct page *page)
 181 {
 182         if (unlikely(PageTransHuge(page)))
 183                 return HPAGE_PMD_NR;
 184         return 1;
 185 }
 186
 187 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
 188                 pmd_t *pmd, int flags);
 189 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
 190                 pud_t *pud, int flags);
 191
 192 extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
 193
 194 extern struct page *huge_zero_page;
 195
 196 static inline bool is_huge_zero_page(struct page *page)
 197 {
 198         return ACCESS_ONCE(huge_zero_page) == page;
 199 }
 200
 201 static inline bool is_huge_zero_pmd(pmd_t pmd)
 202 {
 203         return is_huge_zero_page(pmd_page(pmd));
 204 }
 205
 206 static inline bool is_huge_zero_pud(pud_t pud)
 207 {
 208         return false;
 209 }
 210
 211 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
 212 void mm_put_huge_zero_page(struct mm_struct *mm);
 213
 214 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
 215
 216 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 217 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
 218 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
 219 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
 220
 221 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
 222 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
 223 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
 224
 225 #define hpage_nr_pages(x) 1
 226
 227 #define transparent_hugepage_enabled(__vma) 0
 228
 229 static inline void prep_transhuge_page(struct page *page) {}
 230
 231 #define transparent_hugepage_flags 0UL
 232
 233 #define thp_get_unmapped_area   NULL
 234
 235 static inline bool
 236 can_split_huge_page(struct page *page, int *pextra_pins)
 237 {
 238         BUILD_BUG();
 239         return false;
 240 }
 241 static inline int
 242 split_huge_page_to_list(struct page *page, struct list_head *list)
 243 {
 244         return 0;
 245 }
 246 static inline int split_huge_page(struct page *page)
 247 {
 248         return 0;
 249 }
 250 static inline void deferred_split_huge_page(struct page *page) {}
 251 #define split_huge_pmd(__vma, __pmd, __address) \
 252         do { } while (0)
 253
 254 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 255                 unsigned long address, bool freeze, struct page *page) {}
 256 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
 257                 unsigned long address, bool freeze, struct page *page) {}
 258
 259 #define split_huge_pud(__vma, __pmd, __address) \
 260         do { } while (0)
 261
 262 static inline int hugepage_madvise(struct vm_area_struct *vma,
 263                                    unsigned long *vm_flags, int advice)
 264 {
 265         BUG();
 266         return 0;
 267 }
 268 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 269                                          unsigned long start,
 270                                          unsigned long end,
 271                                          long adjust_next)
 272 {
 273 }
 274 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
 275                 struct vm_area_struct *vma)
 276 {
 277         return NULL;
 278 }
 279 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
 280                 struct vm_area_struct *vma)
 281 {
 282         return NULL;
 283 }
 284
 285 static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
 286 {
 287         return 0;
 288 }
 289
 290 static inline bool is_huge_zero_page(struct page *page)
 291 {
 292         return false;
 293 }
 294
 295 static inline bool is_huge_zero_pud(pud_t pud)
 296 {
 297         return false;
 298 }
 299
 300 static inline void mm_put_huge_zero_page(struct mm_struct *mm)
 301 {
 302         return;
 303 }
 304
 305 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
 306                 unsigned long addr, pmd_t *pmd, int flags)
 307 {
 308         return NULL;
 309 }
 310
 311 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
 312                 unsigned long addr, pud_t *pud, int flags)
 313 {
 314         return NULL;
 315 }
 316 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 317
 318 #endif /* _LINUX_HUGE_MM_H */