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 struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, 29 unsigned long addr, pmd_t *pmd, 30 unsigned int flags); 31 bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, 32 pmd_t *pmd, unsigned long addr, unsigned long next); 33 int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, 34 unsigned long addr); 35 int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud, 36 unsigned long addr); 37 bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr, 38 unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd); 39 int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, 40 pgprot_t newprot, unsigned long cp_flags); 41 vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn, 42 pgprot_t pgprot, bool write); 43 44 /** 45 * vmf_insert_pfn_pmd - insert a pmd size pfn 46 * @vmf: Structure describing the fault 47 * @pfn: pfn to insert 48 * @pgprot: page protection to use 49 * @write: whether it's a write fault 50 * 51 * Insert a pmd size pfn. See vmf_insert_pfn() for additional info. 52 * 53 * Return: vm_fault_t value. 54 */ 55 static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, 56 bool write) 57 { 58 return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write); 59 } 60 vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn, 61 pgprot_t pgprot, bool write); 62 63 /** 64 * vmf_insert_pfn_pud - insert a pud size pfn 65 * @vmf: Structure describing the fault 66 * @pfn: pfn to insert 67 * @pgprot: page protection to use 68 * @write: whether it's a write fault 69 * 70 * Insert a pud size pfn. See vmf_insert_pfn() for additional info. 71 * 72 * Return: vm_fault_t value. 73 */ 74 static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, 75 bool write) 76 { 77 return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write); 78 } 79 80 enum transparent_hugepage_flag { 81 TRANSPARENT_HUGEPAGE_NEVER_DAX, 82 TRANSPARENT_HUGEPAGE_FLAG, 83 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, 84 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, 85 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, 86 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, 87 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, 88 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, 89 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, 90 }; 91 92 struct kobject; 93 struct kobj_attribute; 94 95 ssize_t single_hugepage_flag_store(struct kobject *kobj, 96 struct kobj_attribute *attr, 97 const char *buf, size_t count, 98 enum transparent_hugepage_flag flag); 99 ssize_t single_hugepage_flag_show(struct kobject *kobj, 100 struct kobj_attribute *attr, char *buf, 101 enum transparent_hugepage_flag flag); 102 extern struct kobj_attribute shmem_enabled_attr; 103 104 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) 105 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) 106 107 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 108 #define HPAGE_PMD_SHIFT PMD_SHIFT 109 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) 110 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) 111 112 #define HPAGE_PUD_SHIFT PUD_SHIFT 113 #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT) 114 #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1)) 115 116 extern unsigned long transparent_hugepage_flags; 117 118 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, 119 unsigned long haddr) 120 { 121 /* Don't have to check pgoff for anonymous vma */ 122 if (!vma_is_anonymous(vma)) { 123 if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff, 124 HPAGE_PMD_NR)) 125 return false; 126 } 127 128 if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end) 129 return false; 130 return true; 131 } 132 133 static inline bool transhuge_vma_enabled(struct vm_area_struct *vma, 134 unsigned long vm_flags) 135 { 136 /* Explicitly disabled through madvise. */ 137 if ((vm_flags & VM_NOHUGEPAGE) || 138 test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)) 139 return false; 140 return true; 141 } 142 143 /* 144 * to be used on vmas which are known to support THP. 145 * Use transparent_hugepage_active otherwise 146 */ 147 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma) 148 { 149 150 /* 151 * If the hardware/firmware marked hugepage support disabled. 152 */ 153 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX)) 154 return false; 155 156 if (!transhuge_vma_enabled(vma, vma->vm_flags)) 157 return false; 158 159 if (vma_is_temporary_stack(vma)) 160 return false; 161 162 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG)) 163 return true; 164 165 if (vma_is_dax(vma)) 166 return true; 167 168 if (transparent_hugepage_flags & 169 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)) 170 return !!(vma->vm_flags & VM_HUGEPAGE); 171 172 return false; 173 } 174 175 bool transparent_hugepage_active(struct vm_area_struct *vma); 176 177 #define transparent_hugepage_use_zero_page() \ 178 (transparent_hugepage_flags & \ 179 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) 180 181 unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, 182 unsigned long len, unsigned long pgoff, unsigned long flags); 183 184 void prep_transhuge_page(struct page *page); 185 void free_transhuge_page(struct page *page); 186 bool is_transparent_hugepage(struct page *page); 187 188 bool can_split_huge_page(struct page *page, int *pextra_pins); 189 int split_huge_page_to_list(struct page *page, struct list_head *list); 190 static inline int split_huge_page(struct page *page) 191 { 192 return split_huge_page_to_list(page, NULL); 193 } 194 void deferred_split_huge_page(struct page *page); 195 196 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 197 unsigned long address, bool freeze, struct page *page); 198 199 #define split_huge_pmd(__vma, __pmd, __address) \ 200 do { \ 201 pmd_t *____pmd = (__pmd); \ 202 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \ 203 || pmd_devmap(*____pmd)) \ 204 __split_huge_pmd(__vma, __pmd, __address, \ 205 false, NULL); \ 206 } while (0) 207 208 209 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, 210 bool freeze, struct page *page); 211 212 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, 213 unsigned long address); 214 215 #define split_huge_pud(__vma, __pud, __address) \ 216 do { \ 217 pud_t *____pud = (__pud); \ 218 if (pud_trans_huge(*____pud) \ 219 || pud_devmap(*____pud)) \ 220 __split_huge_pud(__vma, __pud, __address); \ 221 } while (0) 222 223 int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, 224 int advice); 225 void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, 226 unsigned long end, long adjust_next); 227 spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma); 228 spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma); 229 230 static inline int is_swap_pmd(pmd_t pmd) 231 { 232 return !pmd_none(pmd) && !pmd_present(pmd); 233 } 234 235 /* mmap_lock must be held on entry */ 236 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, 237 struct vm_area_struct *vma) 238 { 239 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) 240 return __pmd_trans_huge_lock(pmd, vma); 241 else 242 return NULL; 243 } 244 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, 245 struct vm_area_struct *vma) 246 { 247 if (pud_trans_huge(*pud) || pud_devmap(*pud)) 248 return __pud_trans_huge_lock(pud, vma); 249 else 250 return NULL; 251 } 252 253 /** 254 * thp_head - Head page of a transparent huge page. 255 * @page: Any page (tail, head or regular) found in the page cache. 256 */ 257 static inline struct page *thp_head(struct page *page) 258 { 259 return compound_head(page); 260 } 261 262 /** 263 * thp_order - Order of a transparent huge page. 264 * @page: Head page of a transparent huge page. 265 */ 266 static inline unsigned int thp_order(struct page *page) 267 { 268 VM_BUG_ON_PGFLAGS(PageTail(page), page); 269 if (PageHead(page)) 270 return HPAGE_PMD_ORDER; 271 return 0; 272 } 273 274 /** 275 * thp_nr_pages - The number of regular pages in this huge page. 276 * @page: The head page of a huge page. 277 */ 278 static inline int thp_nr_pages(struct page *page) 279 { 280 VM_BUG_ON_PGFLAGS(PageTail(page), page); 281 if (PageHead(page)) 282 return HPAGE_PMD_NR; 283 return 1; 284 } 285 286 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, 287 pmd_t *pmd, int flags, struct dev_pagemap **pgmap); 288 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr, 289 pud_t *pud, int flags, struct dev_pagemap **pgmap); 290 291 vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf); 292 293 extern struct page *huge_zero_page; 294 extern unsigned long huge_zero_pfn; 295 296 static inline bool is_huge_zero_page(struct page *page) 297 { 298 return READ_ONCE(huge_zero_page) == page; 299 } 300 301 static inline bool is_huge_zero_pmd(pmd_t pmd) 302 { 303 return READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd) && pmd_present(pmd); 304 } 305 306 static inline bool is_huge_zero_pud(pud_t pud) 307 { 308 return false; 309 } 310 311 struct page *mm_get_huge_zero_page(struct mm_struct *mm); 312 void mm_put_huge_zero_page(struct mm_struct *mm); 313 314 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot)) 315 316 static inline bool thp_migration_supported(void) 317 { 318 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION); 319 } 320 321 static inline struct list_head *page_deferred_list(struct page *page) 322 { 323 /* 324 * Global or memcg deferred list in the second tail pages is 325 * occupied by compound_head. 326 */ 327 return &page[2].deferred_list; 328 } 329 330 #else /* CONFIG_TRANSPARENT_HUGEPAGE */ 331 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) 332 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) 333 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) 334 335 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; }) 336 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; }) 337 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; }) 338 339 static inline struct page *thp_head(struct page *page) 340 { 341 VM_BUG_ON_PGFLAGS(PageTail(page), page); 342 return page; 343 } 344 345 static inline unsigned int thp_order(struct page *page) 346 { 347 VM_BUG_ON_PGFLAGS(PageTail(page), page); 348 return 0; 349 } 350 351 static inline int thp_nr_pages(struct page *page) 352 { 353 VM_BUG_ON_PGFLAGS(PageTail(page), page); 354 return 1; 355 } 356 357 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma) 358 { 359 return false; 360 } 361 362 static inline bool transparent_hugepage_active(struct vm_area_struct *vma) 363 { 364 return false; 365 } 366 367 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, 368 unsigned long haddr) 369 { 370 return false; 371 } 372 373 static inline bool transhuge_vma_enabled(struct vm_area_struct *vma, 374 unsigned long vm_flags) 375 { 376 return false; 377 } 378 379 static inline void prep_transhuge_page(struct page *page) {} 380 381 static inline bool is_transparent_hugepage(struct page *page) 382 { 383 return false; 384 } 385 386 #define transparent_hugepage_flags 0UL 387 388 #define thp_get_unmapped_area NULL 389 390 static inline bool 391 can_split_huge_page(struct page *page, int *pextra_pins) 392 { 393 BUILD_BUG(); 394 return false; 395 } 396 static inline int 397 split_huge_page_to_list(struct page *page, struct list_head *list) 398 { 399 return 0; 400 } 401 static inline int split_huge_page(struct page *page) 402 { 403 return 0; 404 } 405 static inline void deferred_split_huge_page(struct page *page) {} 406 #define split_huge_pmd(__vma, __pmd, __address) \ 407 do { } while (0) 408 409 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, 410 unsigned long address, bool freeze, struct page *page) {} 411 static inline void split_huge_pmd_address(struct vm_area_struct *vma, 412 unsigned long address, bool freeze, struct page *page) {} 413 414 #define split_huge_pud(__vma, __pmd, __address) \ 415 do { } while (0) 416 417 static inline int hugepage_madvise(struct vm_area_struct *vma, 418 unsigned long *vm_flags, int advice) 419 { 420 BUG(); 421 return 0; 422 } 423 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, 424 unsigned long start, 425 unsigned long end, 426 long adjust_next) 427 { 428 } 429 static inline int is_swap_pmd(pmd_t pmd) 430 { 431 return 0; 432 } 433 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, 434 struct vm_area_struct *vma) 435 { 436 return NULL; 437 } 438 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, 439 struct vm_area_struct *vma) 440 { 441 return NULL; 442 } 443 444 static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) 445 { 446 return 0; 447 } 448 449 static inline bool is_huge_zero_page(struct page *page) 450 { 451 return false; 452 } 453 454 static inline bool is_huge_zero_pmd(pmd_t pmd) 455 { 456 return false; 457 } 458 459 static inline bool is_huge_zero_pud(pud_t pud) 460 { 461 return false; 462 } 463 464 static inline void mm_put_huge_zero_page(struct mm_struct *mm) 465 { 466 return; 467 } 468 469 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, 470 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap) 471 { 472 return NULL; 473 } 474 475 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma, 476 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap) 477 { 478 return NULL; 479 } 480 481 static inline bool thp_migration_supported(void) 482 { 483 return false; 484 } 485 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 486 487 /** 488 * thp_size - Size of a transparent huge page. 489 * @page: Head page of a transparent huge page. 490 * 491 * Return: Number of bytes in this page. 492 */ 493 static inline unsigned long thp_size(struct page *page) 494 { 495 return PAGE_SIZE << thp_order(page); 496 } 497 498 #endif /* _LINUX_HUGE_MM_H */ 499