1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_HUGE_MM_H 3 #define _LINUX_HUGE_MM_H 4 5 #include <linux/sched/coredump.h> 6 7 #include <linux/fs.h> /* only for vma_is_dax() */ 8 9 extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf); 10 extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, 11 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr, 12 struct vm_area_struct *vma); 13 extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd); 14 extern int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm, 15 pud_t *dst_pud, pud_t *src_pud, unsigned long addr, 16 struct vm_area_struct *vma); 17 18 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD 19 extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud); 20 #else 21 static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud) 22 { 23 } 24 #endif 25 26 extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd); 27 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, 28 unsigned long addr, 29 pmd_t *pmd, 30 unsigned int flags); 31 extern bool madvise_free_huge_pmd(struct mmu_gather *tlb, 32 struct vm_area_struct *vma, 33 pmd_t *pmd, unsigned long addr, unsigned long next); 34 extern int zap_huge_pmd(struct mmu_gather *tlb, 35 struct vm_area_struct *vma, 36 pmd_t *pmd, unsigned long addr); 37 extern int zap_huge_pud(struct mmu_gather *tlb, 38 struct vm_area_struct *vma, 39 pud_t *pud, unsigned long addr); 40 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 41 unsigned long addr, unsigned long end, 42 unsigned char *vec); 43 extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr, 44 unsigned long new_addr, unsigned long old_end, 45 pmd_t *old_pmd, pmd_t *new_pmd, bool *need_flush); 46 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 47 unsigned long addr, pgprot_t newprot, 48 int prot_numa); 49 int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, 50 pmd_t *pmd, pfn_t pfn, bool write); 51 int vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr, 52 pud_t *pud, pfn_t pfn, bool write); 53 enum transparent_hugepage_flag { 54 TRANSPARENT_HUGEPAGE_FLAG, 55 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, 56 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, 57 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, 58 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, 59 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, 60 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, 61 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, 62 #ifdef CONFIG_DEBUG_VM 63 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, 64 #endif 65 }; 66 67 struct kobject; 68 struct kobj_attribute; 69 70 extern ssize_t single_hugepage_flag_store(struct kobject *kobj, 71 struct kobj_attribute *attr, 72 const char *buf, size_t count, 73 enum transparent_hugepage_flag flag); 74 extern ssize_t single_hugepage_flag_show(struct kobject *kobj, 75 struct kobj_attribute *attr, char *buf, 76 enum transparent_hugepage_flag flag); 77 extern struct kobj_attribute shmem_enabled_attr; 78 79 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) 80 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) 81 82 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 83 #define HPAGE_PMD_SHIFT PMD_SHIFT 84 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) 85 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) 86 87 #define HPAGE_PUD_SHIFT PUD_SHIFT 88 #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT) 89 #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1)) 90 91 extern bool is_vma_temporary_stack(struct vm_area_struct *vma); 92 93 extern unsigned long transparent_hugepage_flags; 94 95 static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma) 96 { 97 if (vma->vm_flags & VM_NOHUGEPAGE) 98 return false; 99 100 if (is_vma_temporary_stack(vma)) 101 return false; 102 103 if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)) 104 return false; 105 106 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG)) 107 return true; 108 109 if (vma_is_dax(vma)) 110 return true; 111 112 if (transparent_hugepage_flags & 113 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)) 114 return !!(vma->vm_flags & VM_HUGEPAGE); 115 116 return false; 117 } 118 119 #define transparent_hugepage_use_zero_page() \ 120 (transparent_hugepage_flags & \ 121 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) 122 #ifdef CONFIG_DEBUG_VM 123 #define transparent_hugepage_debug_cow() \ 124 (transparent_hugepage_flags & \ 125 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG)) 126 #else /* CONFIG_DEBUG_VM */ 127 #define transparent_hugepage_debug_cow() 0 128 #endif /* CONFIG_DEBUG_VM */ 129 130 extern unsigned long thp_get_unmapped_area(struct file *filp, 131 unsigned long addr, unsigned long len, unsigned long pgoff, 132 unsigned long flags); 133 134 extern void prep_transhuge_page(struct page *page); 135 extern void free_transhuge_page(struct page *page); 136 137 bool can_split_huge_page(struct page *page, int *pextra_pins); 138 int split_huge_page_to_list(struct page *page, struct list_head *list); 139 static inline int split_huge_page(struct page *page) 140 { 141 return split_huge_page_to_list(page, NULL); 142 } 143 void deferred_split_huge_page(struct page *page); 144 145 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 146 unsigned long address, bool freeze, struct page *page); 147 148 #define split_huge_pmd(__vma, __pmd, __address) \ 149 do { \ 150 pmd_t *____pmd = (__pmd); \ 151 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \ 152 || pmd_devmap(*____pmd)) \ 153 __split_huge_pmd(__vma, __pmd, __address, \ 154 false, NULL); \ 155 } while (0) 156 157 158 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, 159 bool freeze, struct page *page); 160 161 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, 162 unsigned long address); 163 164 #define split_huge_pud(__vma, __pud, __address) \ 165 do { \ 166 pud_t *____pud = (__pud); \ 167 if (pud_trans_huge(*____pud) \ 168 || pud_devmap(*____pud)) \ 169 __split_huge_pud(__vma, __pud, __address); \ 170 } while (0) 171 172 extern int hugepage_madvise(struct vm_area_struct *vma, 173 unsigned long *vm_flags, int advice); 174 extern void vma_adjust_trans_huge(struct vm_area_struct *vma, 175 unsigned long start, 176 unsigned long end, 177 long adjust_next); 178 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, 179 struct vm_area_struct *vma); 180 extern spinlock_t *__pud_trans_huge_lock(pud_t *pud, 181 struct vm_area_struct *vma); 182 183 static inline int is_swap_pmd(pmd_t pmd) 184 { 185 return !pmd_none(pmd) && !pmd_present(pmd); 186 } 187 188 /* mmap_sem must be held on entry */ 189 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, 190 struct vm_area_struct *vma) 191 { 192 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma); 193 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) 194 return __pmd_trans_huge_lock(pmd, vma); 195 else 196 return NULL; 197 } 198 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, 199 struct vm_area_struct *vma) 200 { 201 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma); 202 if (pud_trans_huge(*pud) || pud_devmap(*pud)) 203 return __pud_trans_huge_lock(pud, vma); 204 else 205 return NULL; 206 } 207 static inline int hpage_nr_pages(struct page *page) 208 { 209 if (unlikely(PageTransHuge(page))) 210 return HPAGE_PMD_NR; 211 return 1; 212 } 213 214 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, 215 pmd_t *pmd, int flags); 216 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr, 217 pud_t *pud, int flags); 218 219 extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd); 220 221 extern struct page *huge_zero_page; 222 223 static inline bool is_huge_zero_page(struct page *page) 224 { 225 return READ_ONCE(huge_zero_page) == page; 226 } 227 228 static inline bool is_huge_zero_pmd(pmd_t pmd) 229 { 230 return is_huge_zero_page(pmd_page(pmd)); 231 } 232 233 static inline bool is_huge_zero_pud(pud_t pud) 234 { 235 return false; 236 } 237 238 struct page *mm_get_huge_zero_page(struct mm_struct *mm); 239 void mm_put_huge_zero_page(struct mm_struct *mm); 240 241 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot)) 242 243 static inline bool thp_migration_supported(void) 244 { 245 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION); 246 } 247 248 #else /* CONFIG_TRANSPARENT_HUGEPAGE */ 249 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) 250 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) 251 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) 252 253 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; }) 254 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; }) 255 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; }) 256 257 #define hpage_nr_pages(x) 1 258 259 static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma) 260 { 261 return false; 262 } 263 264 static inline void prep_transhuge_page(struct page *page) {} 265 266 #define transparent_hugepage_flags 0UL 267 268 #define thp_get_unmapped_area NULL 269 270 static inline bool 271 can_split_huge_page(struct page *page, int *pextra_pins) 272 { 273 BUILD_BUG(); 274 return false; 275 } 276 static inline int 277 split_huge_page_to_list(struct page *page, struct list_head *list) 278 { 279 return 0; 280 } 281 static inline int split_huge_page(struct page *page) 282 { 283 return 0; 284 } 285 static inline void deferred_split_huge_page(struct page *page) {} 286 #define split_huge_pmd(__vma, __pmd, __address) \ 287 do { } while (0) 288 289 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 290 unsigned long address, bool freeze, struct page *page) {} 291 static inline void split_huge_pmd_address(struct vm_area_struct *vma, 292 unsigned long address, bool freeze, struct page *page) {} 293 294 #define split_huge_pud(__vma, __pmd, __address) \ 295 do { } while (0) 296 297 static inline int hugepage_madvise(struct vm_area_struct *vma, 298 unsigned long *vm_flags, int advice) 299 { 300 BUG(); 301 return 0; 302 } 303 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 304 unsigned long start, 305 unsigned long end, 306 long adjust_next) 307 { 308 } 309 static inline int is_swap_pmd(pmd_t pmd) 310 { 311 return 0; 312 } 313 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, 314 struct vm_area_struct *vma) 315 { 316 return NULL; 317 } 318 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, 319 struct vm_area_struct *vma) 320 { 321 return NULL; 322 } 323 324 static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd) 325 { 326 return 0; 327 } 328 329 static inline bool is_huge_zero_page(struct page *page) 330 { 331 return false; 332 } 333 334 static inline bool is_huge_zero_pud(pud_t pud) 335 { 336 return false; 337 } 338 339 static inline void mm_put_huge_zero_page(struct mm_struct *mm) 340 { 341 return; 342 } 343 344 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, 345 unsigned long addr, pmd_t *pmd, int flags) 346 { 347 return NULL; 348 } 349 350 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma, 351 unsigned long addr, pud_t *pud, int flags) 352 { 353 return NULL; 354 } 355 356 static inline bool thp_migration_supported(void) 357 { 358 return false; 359 } 360 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 361 362 #endif /* _LINUX_HUGE_MM_H */ 363