include/linux/huge_mm.h

   1 #ifndef _LINUX_HUGE_MM_H
   2 #define _LINUX_HUGE_MM_H
   3
   4 #include <linux/sched/coredump.h>
   5
   6 #include <linux/fs.h> /* only for vma_is_dax() */
   7
   8 extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf);
   9 extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
  10                          pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
  11                          struct vm_area_struct *vma);
  12 extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
  13 extern int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
  14                          pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
  15                          struct vm_area_struct *vma);
  16
  17 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
  18 extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
  19 #else
  20 static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
  21 {
  22 }
  23 #endif
  24
  25 extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
  26 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
  27                                           unsigned long addr,
  28                                           pmd_t *pmd,
  29                                           unsigned int flags);
  30 extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
  31                         struct vm_area_struct *vma,
  32                         pmd_t *pmd, unsigned long addr, unsigned long next);
  33 extern int zap_huge_pmd(struct mmu_gather *tlb,
  34                         struct vm_area_struct *vma,
  35                         pmd_t *pmd, unsigned long addr);
  36 extern int zap_huge_pud(struct mmu_gather *tlb,
  37                         struct vm_area_struct *vma,
  38                         pud_t *pud, unsigned long addr);
  39 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  40                         unsigned long addr, unsigned long end,
  41                         unsigned char *vec);
  42 extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
  43                          unsigned long new_addr, unsigned long old_end,
  44                          pmd_t *old_pmd, pmd_t *new_pmd, bool *need_flush);
  45 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  46                         unsigned long addr, pgprot_t newprot,
  47                         int prot_numa);
  48 int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
  49                         pmd_t *pmd, pfn_t pfn, bool write);
  50 int vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
  51                         pud_t *pud, pfn_t pfn, bool write);
  52 enum transparent_hugepage_flag {
  53         TRANSPARENT_HUGEPAGE_FLAG,
  54         TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
  55         TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
  56         TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
  57         TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
  58         TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
  59         TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
  60         TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
  61 #ifdef CONFIG_DEBUG_VM
  62         TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
  63 #endif
  64 };
  65
  66 struct kobject;
  67 struct kobj_attribute;
  68
  69 extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
  70                                  struct kobj_attribute *attr,
  71                                  const char *buf, size_t count,
  72                                  enum transparent_hugepage_flag flag);
  73 extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
  74                                 struct kobj_attribute *attr, char *buf,
  75                                 enum transparent_hugepage_flag flag);
  76 extern struct kobj_attribute shmem_enabled_attr;
  77
  78 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
  79 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
  80
  81 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  82 #define HPAGE_PMD_SHIFT PMD_SHIFT
  83 #define HPAGE_PMD_SIZE  ((1UL) << HPAGE_PMD_SHIFT)
  84 #define HPAGE_PMD_MASK  (~(HPAGE_PMD_SIZE - 1))
  85
  86 #define HPAGE_PUD_SHIFT PUD_SHIFT
  87 #define HPAGE_PUD_SIZE  ((1UL) << HPAGE_PUD_SHIFT)
  88 #define HPAGE_PUD_MASK  (~(HPAGE_PUD_SIZE - 1))
  89
  90 extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
  91
  92 extern unsigned long transparent_hugepage_flags;
  93
  94 static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
  95 {
  96         if (vma->vm_flags & VM_NOHUGEPAGE)
  97                 return false;
  98
  99         if (is_vma_temporary_stack(vma))
 100                 return false;
 101
 102         if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
 103                 return false;
 104
 105         if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
 106                 return true;
 107
 108         if (vma_is_dax(vma))
 109                 return true;
 110
 111         if (transparent_hugepage_flags &
 112                                 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
 113                 return !!(vma->vm_flags & VM_HUGEPAGE);
 114
 115         return false;
 116 }
 117
 118 #define transparent_hugepage_use_zero_page()                            \
 119         (transparent_hugepage_flags &                                   \
 120          (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
 121 #ifdef CONFIG_DEBUG_VM
 122 #define transparent_hugepage_debug_cow()                                \
 123         (transparent_hugepage_flags &                                   \
 124          (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
 125 #else /* CONFIG_DEBUG_VM */
 126 #define transparent_hugepage_debug_cow() 0
 127 #endif /* CONFIG_DEBUG_VM */
 128
 129 extern unsigned long thp_get_unmapped_area(struct file *filp,
 130                 unsigned long addr, unsigned long len, unsigned long pgoff,
 131                 unsigned long flags);
 132
 133 extern void prep_transhuge_page(struct page *page);
 134 extern void free_transhuge_page(struct page *page);
 135
 136 bool can_split_huge_page(struct page *page, int *pextra_pins);
 137 int split_huge_page_to_list(struct page *page, struct list_head *list);
 138 static inline int split_huge_page(struct page *page)
 139 {
 140         return split_huge_page_to_list(page, NULL);
 141 }
 142 void deferred_split_huge_page(struct page *page);
 143
 144 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 145                 unsigned long address, bool freeze, struct page *page);
 146
 147 #define split_huge_pmd(__vma, __pmd, __address)                         \
 148         do {                                                            \
 149                 pmd_t *____pmd = (__pmd);                               \
 150                 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd)   \
 151                                         || pmd_devmap(*____pmd))        \
 152                         __split_huge_pmd(__vma, __pmd, __address,       \
 153                                                 false, NULL);           \
 154         }  while (0)
 155
 156
 157 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
 158                 bool freeze, struct page *page);
 159
 160 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
 161                 unsigned long address);
 162
 163 #define split_huge_pud(__vma, __pud, __address)                         \
 164         do {                                                            \
 165                 pud_t *____pud = (__pud);                               \
 166                 if (pud_trans_huge(*____pud)                            \
 167                                         || pud_devmap(*____pud))        \
 168                         __split_huge_pud(__vma, __pud, __address);      \
 169         }  while (0)
 170
 171 extern int hugepage_madvise(struct vm_area_struct *vma,
 172                             unsigned long *vm_flags, int advice);
 173 extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
 174                                     unsigned long start,
 175                                     unsigned long end,
 176                                     long adjust_next);
 177 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
 178                 struct vm_area_struct *vma);
 179 extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
 180                 struct vm_area_struct *vma);
 181
 182 static inline int is_swap_pmd(pmd_t pmd)
 183 {
 184         return !pmd_none(pmd) && !pmd_present(pmd);
 185 }
 186
 187 /* mmap_sem must be held on entry */
 188 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
 189                 struct vm_area_struct *vma)
 190 {
 191         VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
 192         if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
 193                 return __pmd_trans_huge_lock(pmd, vma);
 194         else
 195                 return NULL;
 196 }
 197 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
 198                 struct vm_area_struct *vma)
 199 {
 200         VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
 201         if (pud_trans_huge(*pud) || pud_devmap(*pud))
 202                 return __pud_trans_huge_lock(pud, vma);
 203         else
 204                 return NULL;
 205 }
 206 static inline int hpage_nr_pages(struct page *page)
 207 {
 208         if (unlikely(PageTransHuge(page)))
 209                 return HPAGE_PMD_NR;
 210         return 1;
 211 }
 212
 213 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
 214                 pmd_t *pmd, int flags);
 215 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
 216                 pud_t *pud, int flags);
 217
 218 extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
 219
 220 extern struct page *huge_zero_page;
 221
 222 static inline bool is_huge_zero_page(struct page *page)
 223 {
 224         return ACCESS_ONCE(huge_zero_page) == page;
 225 }
 226
 227 static inline bool is_huge_zero_pmd(pmd_t pmd)
 228 {
 229         return is_huge_zero_page(pmd_page(pmd));
 230 }
 231
 232 static inline bool is_huge_zero_pud(pud_t pud)
 233 {
 234         return false;
 235 }
 236
 237 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
 238 void mm_put_huge_zero_page(struct mm_struct *mm);
 239
 240 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
 241
 242 static inline bool thp_migration_supported(void)
 243 {
 244         return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
 245 }
 246
 247 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 248 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
 249 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
 250 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
 251
 252 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
 253 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
 254 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
 255
 256 #define hpage_nr_pages(x) 1
 257
 258 static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
 259 {
 260         return false;
 261 }
 262
 263 static inline void prep_transhuge_page(struct page *page) {}
 264
 265 #define transparent_hugepage_flags 0UL
 266
 267 #define thp_get_unmapped_area   NULL
 268
 269 static inline bool
 270 can_split_huge_page(struct page *page, int *pextra_pins)
 271 {
 272         BUILD_BUG();
 273         return false;
 274 }
 275 static inline int
 276 split_huge_page_to_list(struct page *page, struct list_head *list)
 277 {
 278         return 0;
 279 }
 280 static inline int split_huge_page(struct page *page)
 281 {
 282         return 0;
 283 }
 284 static inline void deferred_split_huge_page(struct page *page) {}
 285 #define split_huge_pmd(__vma, __pmd, __address) \
 286         do { } while (0)
 287
 288 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 289                 unsigned long address, bool freeze, struct page *page) {}
 290 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
 291                 unsigned long address, bool freeze, struct page *page) {}
 292
 293 #define split_huge_pud(__vma, __pmd, __address) \
 294         do { } while (0)
 295
 296 static inline int hugepage_madvise(struct vm_area_struct *vma,
 297                                    unsigned long *vm_flags, int advice)
 298 {
 299         BUG();
 300         return 0;
 301 }
 302 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 303                                          unsigned long start,
 304                                          unsigned long end,
 305                                          long adjust_next)
 306 {
 307 }
 308 static inline int is_swap_pmd(pmd_t pmd)
 309 {
 310         return 0;
 311 }
 312 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
 313                 struct vm_area_struct *vma)
 314 {
 315         return NULL;
 316 }
 317 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
 318                 struct vm_area_struct *vma)
 319 {
 320         return NULL;
 321 }
 322
 323 static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
 324 {
 325         return 0;
 326 }
 327
 328 static inline bool is_huge_zero_page(struct page *page)
 329 {
 330         return false;
 331 }
 332
 333 static inline bool is_huge_zero_pud(pud_t pud)
 334 {
 335         return false;
 336 }
 337
 338 static inline void mm_put_huge_zero_page(struct mm_struct *mm)
 339 {
 340         return;
 341 }
 342
 343 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
 344                 unsigned long addr, pmd_t *pmd, int flags)
 345 {
 346         return NULL;
 347 }
 348
 349 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
 350                 unsigned long addr, pud_t *pud, int flags)
 351 {
 352         return NULL;
 353 }
 354
 355 static inline bool thp_migration_supported(void)
 356 {
 357         return false;
 358 }
 359 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 360
 361 #endif /* _LINUX_HUGE_MM_H */