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 #include <linux/mm_types.h> 7 8 #include <linux/fs.h> /* only for vma_is_dax() */ 9 10 vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf); 11 int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, 12 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr, 13 struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma); 14 void huge_pmd_set_accessed(struct vm_fault *vmf); 15 int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm, 16 pud_t *dst_pud, pud_t *src_pud, unsigned long addr, 17 struct vm_area_struct *vma); 18 19 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD 20 void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud); 21 #else 22 static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud) 23 { 24 } 25 #endif 26 27 vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf); 28 bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, 29 pmd_t *pmd, unsigned long addr, unsigned long next); 30 int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, 31 unsigned long addr); 32 int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud, 33 unsigned long addr); 34 bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr, 35 unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd); 36 int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, 37 pmd_t *pmd, unsigned long addr, pgprot_t newprot, 38 unsigned long cp_flags); 39 40 vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write); 41 vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write); 42 43 enum transparent_hugepage_flag { 44 TRANSPARENT_HUGEPAGE_UNSUPPORTED, 45 TRANSPARENT_HUGEPAGE_FLAG, 46 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, 47 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, 48 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, 49 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, 50 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, 51 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, 52 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, 53 }; 54 55 struct kobject; 56 struct kobj_attribute; 57 58 ssize_t single_hugepage_flag_store(struct kobject *kobj, 59 struct kobj_attribute *attr, 60 const char *buf, size_t count, 61 enum transparent_hugepage_flag flag); 62 ssize_t single_hugepage_flag_show(struct kobject *kobj, 63 struct kobj_attribute *attr, char *buf, 64 enum transparent_hugepage_flag flag); 65 extern struct kobj_attribute shmem_enabled_attr; 66 67 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) 68 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) 69 70 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 71 #define HPAGE_PMD_SHIFT PMD_SHIFT 72 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) 73 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) 74 75 #define HPAGE_PUD_SHIFT PUD_SHIFT 76 #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT) 77 #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1)) 78 79 extern unsigned long transparent_hugepage_flags; 80 81 #define hugepage_flags_enabled() \ 82 (transparent_hugepage_flags & \ 83 ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \ 84 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))) 85 #define hugepage_flags_always() \ 86 (transparent_hugepage_flags & \ 87 (1<<TRANSPARENT_HUGEPAGE_FLAG)) 88 89 /* 90 * Do the below checks: 91 * - For file vma, check if the linear page offset of vma is 92 * HPAGE_PMD_NR aligned within the file. The hugepage is 93 * guaranteed to be hugepage-aligned within the file, but we must 94 * check that the PMD-aligned addresses in the VMA map to 95 * PMD-aligned offsets within the file, else the hugepage will 96 * not be PMD-mappable. 97 * - For all vmas, check if the haddr is in an aligned HPAGE_PMD_SIZE 98 * area. 99 */ 100 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, 101 unsigned long addr) 102 { 103 unsigned long haddr; 104 105 /* Don't have to check pgoff for anonymous vma */ 106 if (!vma_is_anonymous(vma)) { 107 if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff, 108 HPAGE_PMD_NR)) 109 return false; 110 } 111 112 haddr = addr & HPAGE_PMD_MASK; 113 114 if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end) 115 return false; 116 return true; 117 } 118 119 static inline bool file_thp_enabled(struct vm_area_struct *vma) 120 { 121 struct inode *inode; 122 123 if (!vma->vm_file) 124 return false; 125 126 inode = vma->vm_file->f_inode; 127 128 return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) && 129 (vma->vm_flags & VM_EXEC) && 130 !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode); 131 } 132 133 bool hugepage_vma_check(struct vm_area_struct *vma, unsigned long vm_flags, 134 bool smaps, bool in_pf, bool enforce_sysfs); 135 136 #define transparent_hugepage_use_zero_page() \ 137 (transparent_hugepage_flags & \ 138 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) 139 140 unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, 141 unsigned long len, unsigned long pgoff, unsigned long flags); 142 143 void folio_prep_large_rmappable(struct folio *folio); 144 bool can_split_folio(struct folio *folio, int *pextra_pins); 145 int split_huge_page_to_list(struct page *page, struct list_head *list); 146 static inline int split_huge_page(struct page *page) 147 { 148 return split_huge_page_to_list(page, NULL); 149 } 150 void deferred_split_folio(struct folio *folio); 151 152 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 153 unsigned long address, bool freeze, struct folio *folio); 154 155 #define split_huge_pmd(__vma, __pmd, __address) \ 156 do { \ 157 pmd_t *____pmd = (__pmd); \ 158 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \ 159 || pmd_devmap(*____pmd)) \ 160 __split_huge_pmd(__vma, __pmd, __address, \ 161 false, NULL); \ 162 } while (0) 163 164 165 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, 166 bool freeze, struct folio *folio); 167 168 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, 169 unsigned long address); 170 171 #define split_huge_pud(__vma, __pud, __address) \ 172 do { \ 173 pud_t *____pud = (__pud); \ 174 if (pud_trans_huge(*____pud) \ 175 || pud_devmap(*____pud)) \ 176 __split_huge_pud(__vma, __pud, __address); \ 177 } while (0) 178 179 int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, 180 int advice); 181 int madvise_collapse(struct vm_area_struct *vma, 182 struct vm_area_struct **prev, 183 unsigned long start, unsigned long end); 184 void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, 185 unsigned long end, long adjust_next); 186 spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma); 187 spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma); 188 189 static inline int is_swap_pmd(pmd_t pmd) 190 { 191 return !pmd_none(pmd) && !pmd_present(pmd); 192 } 193 194 /* mmap_lock must be held on entry */ 195 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, 196 struct vm_area_struct *vma) 197 { 198 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) 199 return __pmd_trans_huge_lock(pmd, vma); 200 else 201 return NULL; 202 } 203 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, 204 struct vm_area_struct *vma) 205 { 206 if (pud_trans_huge(*pud) || pud_devmap(*pud)) 207 return __pud_trans_huge_lock(pud, vma); 208 else 209 return NULL; 210 } 211 212 /** 213 * folio_test_pmd_mappable - Can we map this folio with a PMD? 214 * @folio: The folio to test 215 */ 216 static inline bool folio_test_pmd_mappable(struct folio *folio) 217 { 218 return folio_order(folio) >= HPAGE_PMD_ORDER; 219 } 220 221 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, 222 pmd_t *pmd, int flags, struct dev_pagemap **pgmap); 223 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr, 224 pud_t *pud, int flags, struct dev_pagemap **pgmap); 225 226 vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf); 227 228 extern struct page *huge_zero_page; 229 extern unsigned long huge_zero_pfn; 230 231 static inline bool is_huge_zero_page(struct page *page) 232 { 233 return READ_ONCE(huge_zero_page) == page; 234 } 235 236 static inline bool is_huge_zero_pmd(pmd_t pmd) 237 { 238 return pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd); 239 } 240 241 static inline bool is_huge_zero_pud(pud_t pud) 242 { 243 return false; 244 } 245 246 struct page *mm_get_huge_zero_page(struct mm_struct *mm); 247 void mm_put_huge_zero_page(struct mm_struct *mm); 248 249 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot)) 250 251 static inline bool thp_migration_supported(void) 252 { 253 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION); 254 } 255 256 #else /* CONFIG_TRANSPARENT_HUGEPAGE */ 257 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) 258 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) 259 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) 260 261 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; }) 262 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; }) 263 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; }) 264 265 static inline bool folio_test_pmd_mappable(struct folio *folio) 266 { 267 return false; 268 } 269 270 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, 271 unsigned long addr) 272 { 273 return false; 274 } 275 276 static inline bool hugepage_vma_check(struct vm_area_struct *vma, 277 unsigned long vm_flags, bool smaps, 278 bool in_pf, bool enforce_sysfs) 279 { 280 return false; 281 } 282 283 static inline void folio_prep_large_rmappable(struct folio *folio) {} 284 285 #define transparent_hugepage_flags 0UL 286 287 #define thp_get_unmapped_area NULL 288 289 static inline bool 290 can_split_folio(struct folio *folio, int *pextra_pins) 291 { 292 return false; 293 } 294 static inline int 295 split_huge_page_to_list(struct page *page, struct list_head *list) 296 { 297 return 0; 298 } 299 static inline int split_huge_page(struct page *page) 300 { 301 return 0; 302 } 303 static inline void deferred_split_folio(struct folio *folio) {} 304 #define split_huge_pmd(__vma, __pmd, __address) \ 305 do { } while (0) 306 307 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 308 unsigned long address, bool freeze, struct folio *folio) {} 309 static inline void split_huge_pmd_address(struct vm_area_struct *vma, 310 unsigned long address, bool freeze, struct folio *folio) {} 311 312 #define split_huge_pud(__vma, __pmd, __address) \ 313 do { } while (0) 314 315 static inline int hugepage_madvise(struct vm_area_struct *vma, 316 unsigned long *vm_flags, int advice) 317 { 318 return -EINVAL; 319 } 320 321 static inline int madvise_collapse(struct vm_area_struct *vma, 322 struct vm_area_struct **prev, 323 unsigned long start, unsigned long end) 324 { 325 return -EINVAL; 326 } 327 328 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 329 unsigned long start, 330 unsigned long end, 331 long adjust_next) 332 { 333 } 334 static inline int is_swap_pmd(pmd_t pmd) 335 { 336 return 0; 337 } 338 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, 339 struct vm_area_struct *vma) 340 { 341 return NULL; 342 } 343 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, 344 struct vm_area_struct *vma) 345 { 346 return NULL; 347 } 348 349 static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) 350 { 351 return 0; 352 } 353 354 static inline bool is_huge_zero_page(struct page *page) 355 { 356 return false; 357 } 358 359 static inline bool is_huge_zero_pmd(pmd_t pmd) 360 { 361 return false; 362 } 363 364 static inline bool is_huge_zero_pud(pud_t pud) 365 { 366 return false; 367 } 368 369 static inline void mm_put_huge_zero_page(struct mm_struct *mm) 370 { 371 return; 372 } 373 374 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, 375 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap) 376 { 377 return NULL; 378 } 379 380 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma, 381 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap) 382 { 383 return NULL; 384 } 385 386 static inline bool thp_migration_supported(void) 387 { 388 return false; 389 } 390 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 391 392 static inline int split_folio_to_list(struct folio *folio, 393 struct list_head *list) 394 { 395 return split_huge_page_to_list(&folio->page, list); 396 } 397 398 static inline int split_folio(struct folio *folio) 399 { 400 return split_folio_to_list(folio, NULL); 401 } 402 403 /* 404 * archs that select ARCH_WANTS_THP_SWAP but don't support THP_SWP due to 405 * limitations in the implementation like arm64 MTE can override this to 406 * false 407 */ 408 #ifndef arch_thp_swp_supported 409 static inline bool arch_thp_swp_supported(void) 410 { 411 return true; 412 } 413 #endif 414 415 #endif /* _LINUX_HUGE_MM_H */ 416