1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_HUGETLB_H 3 #define _LINUX_HUGETLB_H 4 5 #include <linux/mm_types.h> 6 #include <linux/mmdebug.h> 7 #include <linux/fs.h> 8 #include <linux/hugetlb_inline.h> 9 #include <linux/cgroup.h> 10 #include <linux/list.h> 11 #include <linux/kref.h> 12 #include <linux/pgtable.h> 13 #include <linux/gfp.h> 14 #include <linux/userfaultfd_k.h> 15 16 struct ctl_table; 17 struct user_struct; 18 struct mmu_gather; 19 20 #ifndef is_hugepd 21 typedef struct { unsigned long pd; } hugepd_t; 22 #define is_hugepd(hugepd) (0) 23 #define __hugepd(x) ((hugepd_t) { (x) }) 24 #endif 25 26 #ifdef CONFIG_HUGETLB_PAGE 27 28 #include <linux/mempolicy.h> 29 #include <linux/shm.h> 30 #include <asm/tlbflush.h> 31 32 /* 33 * For HugeTLB page, there are more metadata to save in the struct page. But 34 * the head struct page cannot meet our needs, so we have to abuse other tail 35 * struct page to store the metadata. In order to avoid conflicts caused by 36 * subsequent use of more tail struct pages, we gather these discrete indexes 37 * of tail struct page here. 38 */ 39 enum { 40 SUBPAGE_INDEX_SUBPOOL = 1, /* reuse page->private */ 41 #ifdef CONFIG_CGROUP_HUGETLB 42 SUBPAGE_INDEX_CGROUP, /* reuse page->private */ 43 SUBPAGE_INDEX_CGROUP_RSVD, /* reuse page->private */ 44 __MAX_CGROUP_SUBPAGE_INDEX = SUBPAGE_INDEX_CGROUP_RSVD, 45 #endif 46 __NR_USED_SUBPAGE, 47 }; 48 49 struct hugepage_subpool { 50 spinlock_t lock; 51 long count; 52 long max_hpages; /* Maximum huge pages or -1 if no maximum. */ 53 long used_hpages; /* Used count against maximum, includes */ 54 /* both allocated and reserved pages. */ 55 struct hstate *hstate; 56 long min_hpages; /* Minimum huge pages or -1 if no minimum. */ 57 long rsv_hpages; /* Pages reserved against global pool to */ 58 /* satisfy minimum size. */ 59 }; 60 61 struct resv_map { 62 struct kref refs; 63 spinlock_t lock; 64 struct list_head regions; 65 long adds_in_progress; 66 struct list_head region_cache; 67 long region_cache_count; 68 #ifdef CONFIG_CGROUP_HUGETLB 69 /* 70 * On private mappings, the counter to uncharge reservations is stored 71 * here. If these fields are 0, then either the mapping is shared, or 72 * cgroup accounting is disabled for this resv_map. 73 */ 74 struct page_counter *reservation_counter; 75 unsigned long pages_per_hpage; 76 struct cgroup_subsys_state *css; 77 #endif 78 }; 79 80 /* 81 * Region tracking -- allows tracking of reservations and instantiated pages 82 * across the pages in a mapping. 83 * 84 * The region data structures are embedded into a resv_map and protected 85 * by a resv_map's lock. The set of regions within the resv_map represent 86 * reservations for huge pages, or huge pages that have already been 87 * instantiated within the map. The from and to elements are huge page 88 * indices into the associated mapping. from indicates the starting index 89 * of the region. to represents the first index past the end of the region. 90 * 91 * For example, a file region structure with from == 0 and to == 4 represents 92 * four huge pages in a mapping. It is important to note that the to element 93 * represents the first element past the end of the region. This is used in 94 * arithmetic as 4(to) - 0(from) = 4 huge pages in the region. 95 * 96 * Interval notation of the form [from, to) will be used to indicate that 97 * the endpoint from is inclusive and to is exclusive. 98 */ 99 struct file_region { 100 struct list_head link; 101 long from; 102 long to; 103 #ifdef CONFIG_CGROUP_HUGETLB 104 /* 105 * On shared mappings, each reserved region appears as a struct 106 * file_region in resv_map. These fields hold the info needed to 107 * uncharge each reservation. 108 */ 109 struct page_counter *reservation_counter; 110 struct cgroup_subsys_state *css; 111 #endif 112 }; 113 114 extern struct resv_map *resv_map_alloc(void); 115 void resv_map_release(struct kref *ref); 116 117 extern spinlock_t hugetlb_lock; 118 extern int hugetlb_max_hstate __read_mostly; 119 #define for_each_hstate(h) \ 120 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++) 121 122 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages, 123 long min_hpages); 124 void hugepage_put_subpool(struct hugepage_subpool *spool); 125 126 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 127 int hugetlb_sysctl_handler(struct ctl_table *, int, void *, size_t *, loff_t *); 128 int hugetlb_overcommit_handler(struct ctl_table *, int, void *, size_t *, 129 loff_t *); 130 int hugetlb_treat_movable_handler(struct ctl_table *, int, void *, size_t *, 131 loff_t *); 132 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, void *, size_t *, 133 loff_t *); 134 135 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 136 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 137 struct page **, struct vm_area_struct **, 138 unsigned long *, unsigned long *, long, unsigned int, 139 int *); 140 void unmap_hugepage_range(struct vm_area_struct *, 141 unsigned long, unsigned long, struct page *); 142 void __unmap_hugepage_range_final(struct mmu_gather *tlb, 143 struct vm_area_struct *vma, 144 unsigned long start, unsigned long end, 145 struct page *ref_page); 146 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, 147 unsigned long start, unsigned long end, 148 struct page *ref_page); 149 void hugetlb_report_meminfo(struct seq_file *); 150 int hugetlb_report_node_meminfo(char *buf, int len, int nid); 151 void hugetlb_show_meminfo(void); 152 unsigned long hugetlb_total_pages(void); 153 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 154 unsigned long address, unsigned int flags); 155 #ifdef CONFIG_USERFAULTFD 156 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte, 157 struct vm_area_struct *dst_vma, 158 unsigned long dst_addr, 159 unsigned long src_addr, 160 enum mcopy_atomic_mode mode, 161 struct page **pagep); 162 #endif /* CONFIG_USERFAULTFD */ 163 bool hugetlb_reserve_pages(struct inode *inode, long from, long to, 164 struct vm_area_struct *vma, 165 vm_flags_t vm_flags); 166 long hugetlb_unreserve_pages(struct inode *inode, long start, long end, 167 long freed); 168 bool isolate_huge_page(struct page *page, struct list_head *list); 169 int get_hwpoison_huge_page(struct page *page, bool *hugetlb); 170 void putback_active_hugepage(struct page *page); 171 void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason); 172 void free_huge_page(struct page *page); 173 void hugetlb_fix_reserve_counts(struct inode *inode); 174 extern struct mutex *hugetlb_fault_mutex_table; 175 u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx); 176 177 pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma, 178 unsigned long addr, pud_t *pud); 179 180 struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage); 181 182 extern int sysctl_hugetlb_shm_group; 183 extern struct list_head huge_boot_pages; 184 185 /* arch callbacks */ 186 187 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, 188 unsigned long addr, unsigned long sz); 189 pte_t *huge_pte_offset(struct mm_struct *mm, 190 unsigned long addr, unsigned long sz); 191 int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma, 192 unsigned long *addr, pte_t *ptep); 193 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma, 194 unsigned long *start, unsigned long *end); 195 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 196 int write); 197 struct page *follow_huge_pd(struct vm_area_struct *vma, 198 unsigned long address, hugepd_t hpd, 199 int flags, int pdshift); 200 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 201 pmd_t *pmd, int flags); 202 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 203 pud_t *pud, int flags); 204 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address, 205 pgd_t *pgd, int flags); 206 207 int pmd_huge(pmd_t pmd); 208 int pud_huge(pud_t pud); 209 unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 210 unsigned long address, unsigned long end, pgprot_t newprot); 211 212 bool is_hugetlb_entry_migration(pte_t pte); 213 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma); 214 215 #else /* !CONFIG_HUGETLB_PAGE */ 216 217 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 218 { 219 } 220 221 static inline unsigned long hugetlb_total_pages(void) 222 { 223 return 0; 224 } 225 226 static inline struct address_space *hugetlb_page_mapping_lock_write( 227 struct page *hpage) 228 { 229 return NULL; 230 } 231 232 static inline int huge_pmd_unshare(struct mm_struct *mm, 233 struct vm_area_struct *vma, 234 unsigned long *addr, pte_t *ptep) 235 { 236 return 0; 237 } 238 239 static inline void adjust_range_if_pmd_sharing_possible( 240 struct vm_area_struct *vma, 241 unsigned long *start, unsigned long *end) 242 { 243 } 244 245 static inline long follow_hugetlb_page(struct mm_struct *mm, 246 struct vm_area_struct *vma, struct page **pages, 247 struct vm_area_struct **vmas, unsigned long *position, 248 unsigned long *nr_pages, long i, unsigned int flags, 249 int *nonblocking) 250 { 251 BUG(); 252 return 0; 253 } 254 255 static inline struct page *follow_huge_addr(struct mm_struct *mm, 256 unsigned long address, int write) 257 { 258 return ERR_PTR(-EINVAL); 259 } 260 261 static inline int copy_hugetlb_page_range(struct mm_struct *dst, 262 struct mm_struct *src, struct vm_area_struct *vma) 263 { 264 BUG(); 265 return 0; 266 } 267 268 static inline void hugetlb_report_meminfo(struct seq_file *m) 269 { 270 } 271 272 static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid) 273 { 274 return 0; 275 } 276 277 static inline void hugetlb_show_meminfo(void) 278 { 279 } 280 281 static inline struct page *follow_huge_pd(struct vm_area_struct *vma, 282 unsigned long address, hugepd_t hpd, int flags, 283 int pdshift) 284 { 285 return NULL; 286 } 287 288 static inline struct page *follow_huge_pmd(struct mm_struct *mm, 289 unsigned long address, pmd_t *pmd, int flags) 290 { 291 return NULL; 292 } 293 294 static inline struct page *follow_huge_pud(struct mm_struct *mm, 295 unsigned long address, pud_t *pud, int flags) 296 { 297 return NULL; 298 } 299 300 static inline struct page *follow_huge_pgd(struct mm_struct *mm, 301 unsigned long address, pgd_t *pgd, int flags) 302 { 303 return NULL; 304 } 305 306 static inline int prepare_hugepage_range(struct file *file, 307 unsigned long addr, unsigned long len) 308 { 309 return -EINVAL; 310 } 311 312 static inline int pmd_huge(pmd_t pmd) 313 { 314 return 0; 315 } 316 317 static inline int pud_huge(pud_t pud) 318 { 319 return 0; 320 } 321 322 static inline int is_hugepage_only_range(struct mm_struct *mm, 323 unsigned long addr, unsigned long len) 324 { 325 return 0; 326 } 327 328 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb, 329 unsigned long addr, unsigned long end, 330 unsigned long floor, unsigned long ceiling) 331 { 332 BUG(); 333 } 334 335 #ifdef CONFIG_USERFAULTFD 336 static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, 337 pte_t *dst_pte, 338 struct vm_area_struct *dst_vma, 339 unsigned long dst_addr, 340 unsigned long src_addr, 341 enum mcopy_atomic_mode mode, 342 struct page **pagep) 343 { 344 BUG(); 345 return 0; 346 } 347 #endif /* CONFIG_USERFAULTFD */ 348 349 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, 350 unsigned long sz) 351 { 352 return NULL; 353 } 354 355 static inline bool isolate_huge_page(struct page *page, struct list_head *list) 356 { 357 return false; 358 } 359 360 static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb) 361 { 362 return 0; 363 } 364 365 static inline void putback_active_hugepage(struct page *page) 366 { 367 } 368 369 static inline void move_hugetlb_state(struct page *oldpage, 370 struct page *newpage, int reason) 371 { 372 } 373 374 static inline unsigned long hugetlb_change_protection( 375 struct vm_area_struct *vma, unsigned long address, 376 unsigned long end, pgprot_t newprot) 377 { 378 return 0; 379 } 380 381 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb, 382 struct vm_area_struct *vma, unsigned long start, 383 unsigned long end, struct page *ref_page) 384 { 385 BUG(); 386 } 387 388 static inline void __unmap_hugepage_range(struct mmu_gather *tlb, 389 struct vm_area_struct *vma, unsigned long start, 390 unsigned long end, struct page *ref_page) 391 { 392 BUG(); 393 } 394 395 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm, 396 struct vm_area_struct *vma, unsigned long address, 397 unsigned int flags) 398 { 399 BUG(); 400 return 0; 401 } 402 403 static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { } 404 405 #endif /* !CONFIG_HUGETLB_PAGE */ 406 /* 407 * hugepages at page global directory. If arch support 408 * hugepages at pgd level, they need to define this. 409 */ 410 #ifndef pgd_huge 411 #define pgd_huge(x) 0 412 #endif 413 #ifndef p4d_huge 414 #define p4d_huge(x) 0 415 #endif 416 417 #ifndef pgd_write 418 static inline int pgd_write(pgd_t pgd) 419 { 420 BUG(); 421 return 0; 422 } 423 #endif 424 425 #define HUGETLB_ANON_FILE "anon_hugepage" 426 427 enum { 428 /* 429 * The file will be used as an shm file so shmfs accounting rules 430 * apply 431 */ 432 HUGETLB_SHMFS_INODE = 1, 433 /* 434 * The file is being created on the internal vfs mount and shmfs 435 * accounting rules do not apply 436 */ 437 HUGETLB_ANONHUGE_INODE = 2, 438 }; 439 440 #ifdef CONFIG_HUGETLBFS 441 struct hugetlbfs_sb_info { 442 long max_inodes; /* inodes allowed */ 443 long free_inodes; /* inodes free */ 444 spinlock_t stat_lock; 445 struct hstate *hstate; 446 struct hugepage_subpool *spool; 447 kuid_t uid; 448 kgid_t gid; 449 umode_t mode; 450 }; 451 452 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 453 { 454 return sb->s_fs_info; 455 } 456 457 struct hugetlbfs_inode_info { 458 struct shared_policy policy; 459 struct inode vfs_inode; 460 unsigned int seals; 461 }; 462 463 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 464 { 465 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 466 } 467 468 extern const struct file_operations hugetlbfs_file_operations; 469 extern const struct vm_operations_struct hugetlb_vm_ops; 470 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct, 471 struct ucounts **ucounts, int creat_flags, 472 int page_size_log); 473 474 static inline bool is_file_hugepages(struct file *file) 475 { 476 if (file->f_op == &hugetlbfs_file_operations) 477 return true; 478 479 return is_file_shm_hugepages(file); 480 } 481 482 static inline struct hstate *hstate_inode(struct inode *i) 483 { 484 return HUGETLBFS_SB(i->i_sb)->hstate; 485 } 486 #else /* !CONFIG_HUGETLBFS */ 487 488 #define is_file_hugepages(file) false 489 static inline struct file * 490 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag, 491 struct ucounts **ucounts, int creat_flags, 492 int page_size_log) 493 { 494 return ERR_PTR(-ENOSYS); 495 } 496 497 static inline struct hstate *hstate_inode(struct inode *i) 498 { 499 return NULL; 500 } 501 #endif /* !CONFIG_HUGETLBFS */ 502 503 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 504 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 505 unsigned long len, unsigned long pgoff, 506 unsigned long flags); 507 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 508 509 /* 510 * huegtlb page specific state flags. These flags are located in page.private 511 * of the hugetlb head page. Functions created via the below macros should be 512 * used to manipulate these flags. 513 * 514 * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at 515 * allocation time. Cleared when page is fully instantiated. Free 516 * routine checks flag to restore a reservation on error paths. 517 * Synchronization: Examined or modified by code that knows it has 518 * the only reference to page. i.e. After allocation but before use 519 * or when the page is being freed. 520 * HPG_migratable - Set after a newly allocated page is added to the page 521 * cache and/or page tables. Indicates the page is a candidate for 522 * migration. 523 * Synchronization: Initially set after new page allocation with no 524 * locking. When examined and modified during migration processing 525 * (isolate, migrate, putback) the hugetlb_lock is held. 526 * HPG_temporary - - Set on a page that is temporarily allocated from the buddy 527 * allocator. Typically used for migration target pages when no pages 528 * are available in the pool. The hugetlb free page path will 529 * immediately free pages with this flag set to the buddy allocator. 530 * Synchronization: Can be set after huge page allocation from buddy when 531 * code knows it has only reference. All other examinations and 532 * modifications require hugetlb_lock. 533 * HPG_freed - Set when page is on the free lists. 534 * Synchronization: hugetlb_lock held for examination and modification. 535 * HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed. 536 */ 537 enum hugetlb_page_flags { 538 HPG_restore_reserve = 0, 539 HPG_migratable, 540 HPG_temporary, 541 HPG_freed, 542 HPG_vmemmap_optimized, 543 __NR_HPAGEFLAGS, 544 }; 545 546 /* 547 * Macros to create test, set and clear function definitions for 548 * hugetlb specific page flags. 549 */ 550 #ifdef CONFIG_HUGETLB_PAGE 551 #define TESTHPAGEFLAG(uname, flname) \ 552 static inline int HPage##uname(struct page *page) \ 553 { return test_bit(HPG_##flname, &(page->private)); } 554 555 #define SETHPAGEFLAG(uname, flname) \ 556 static inline void SetHPage##uname(struct page *page) \ 557 { set_bit(HPG_##flname, &(page->private)); } 558 559 #define CLEARHPAGEFLAG(uname, flname) \ 560 static inline void ClearHPage##uname(struct page *page) \ 561 { clear_bit(HPG_##flname, &(page->private)); } 562 #else 563 #define TESTHPAGEFLAG(uname, flname) \ 564 static inline int HPage##uname(struct page *page) \ 565 { return 0; } 566 567 #define SETHPAGEFLAG(uname, flname) \ 568 static inline void SetHPage##uname(struct page *page) \ 569 { } 570 571 #define CLEARHPAGEFLAG(uname, flname) \ 572 static inline void ClearHPage##uname(struct page *page) \ 573 { } 574 #endif 575 576 #define HPAGEFLAG(uname, flname) \ 577 TESTHPAGEFLAG(uname, flname) \ 578 SETHPAGEFLAG(uname, flname) \ 579 CLEARHPAGEFLAG(uname, flname) \ 580 581 /* 582 * Create functions associated with hugetlb page flags 583 */ 584 HPAGEFLAG(RestoreReserve, restore_reserve) 585 HPAGEFLAG(Migratable, migratable) 586 HPAGEFLAG(Temporary, temporary) 587 HPAGEFLAG(Freed, freed) 588 HPAGEFLAG(VmemmapOptimized, vmemmap_optimized) 589 590 #ifdef CONFIG_HUGETLB_PAGE 591 592 #define HSTATE_NAME_LEN 32 593 /* Defines one hugetlb page size */ 594 struct hstate { 595 struct mutex resize_lock; 596 int next_nid_to_alloc; 597 int next_nid_to_free; 598 unsigned int order; 599 unsigned long mask; 600 unsigned long max_huge_pages; 601 unsigned long nr_huge_pages; 602 unsigned long free_huge_pages; 603 unsigned long resv_huge_pages; 604 unsigned long surplus_huge_pages; 605 unsigned long nr_overcommit_huge_pages; 606 struct list_head hugepage_activelist; 607 struct list_head hugepage_freelists[MAX_NUMNODES]; 608 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 609 unsigned int free_huge_pages_node[MAX_NUMNODES]; 610 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 611 #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP 612 unsigned int nr_free_vmemmap_pages; 613 #endif 614 #ifdef CONFIG_CGROUP_HUGETLB 615 /* cgroup control files */ 616 struct cftype cgroup_files_dfl[7]; 617 struct cftype cgroup_files_legacy[9]; 618 #endif 619 char name[HSTATE_NAME_LEN]; 620 }; 621 622 struct huge_bootmem_page { 623 struct list_head list; 624 struct hstate *hstate; 625 }; 626 627 int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list); 628 struct page *alloc_huge_page(struct vm_area_struct *vma, 629 unsigned long addr, int avoid_reserve); 630 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, 631 nodemask_t *nmask, gfp_t gfp_mask); 632 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma, 633 unsigned long address); 634 int huge_add_to_page_cache(struct page *page, struct address_space *mapping, 635 pgoff_t idx); 636 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma, 637 unsigned long address, struct page *page); 638 639 /* arch callback */ 640 int __init __alloc_bootmem_huge_page(struct hstate *h); 641 int __init alloc_bootmem_huge_page(struct hstate *h); 642 643 void __init hugetlb_add_hstate(unsigned order); 644 bool __init arch_hugetlb_valid_size(unsigned long size); 645 struct hstate *size_to_hstate(unsigned long size); 646 647 #ifndef HUGE_MAX_HSTATE 648 #define HUGE_MAX_HSTATE 1 649 #endif 650 651 extern struct hstate hstates[HUGE_MAX_HSTATE]; 652 extern unsigned int default_hstate_idx; 653 654 #define default_hstate (hstates[default_hstate_idx]) 655 656 /* 657 * hugetlb page subpool pointer located in hpage[1].private 658 */ 659 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage) 660 { 661 return (void *)page_private(hpage + SUBPAGE_INDEX_SUBPOOL); 662 } 663 664 static inline void hugetlb_set_page_subpool(struct page *hpage, 665 struct hugepage_subpool *subpool) 666 { 667 set_page_private(hpage + SUBPAGE_INDEX_SUBPOOL, (unsigned long)subpool); 668 } 669 670 static inline struct hstate *hstate_file(struct file *f) 671 { 672 return hstate_inode(file_inode(f)); 673 } 674 675 static inline struct hstate *hstate_sizelog(int page_size_log) 676 { 677 if (!page_size_log) 678 return &default_hstate; 679 680 return size_to_hstate(1UL << page_size_log); 681 } 682 683 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 684 { 685 return hstate_file(vma->vm_file); 686 } 687 688 static inline unsigned long huge_page_size(struct hstate *h) 689 { 690 return (unsigned long)PAGE_SIZE << h->order; 691 } 692 693 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 694 695 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 696 697 static inline unsigned long huge_page_mask(struct hstate *h) 698 { 699 return h->mask; 700 } 701 702 static inline unsigned int huge_page_order(struct hstate *h) 703 { 704 return h->order; 705 } 706 707 static inline unsigned huge_page_shift(struct hstate *h) 708 { 709 return h->order + PAGE_SHIFT; 710 } 711 712 static inline bool hstate_is_gigantic(struct hstate *h) 713 { 714 return huge_page_order(h) >= MAX_ORDER; 715 } 716 717 static inline unsigned int pages_per_huge_page(struct hstate *h) 718 { 719 return 1 << h->order; 720 } 721 722 static inline unsigned int blocks_per_huge_page(struct hstate *h) 723 { 724 return huge_page_size(h) / 512; 725 } 726 727 #include <asm/hugetlb.h> 728 729 #ifndef is_hugepage_only_range 730 static inline int is_hugepage_only_range(struct mm_struct *mm, 731 unsigned long addr, unsigned long len) 732 { 733 return 0; 734 } 735 #define is_hugepage_only_range is_hugepage_only_range 736 #endif 737 738 #ifndef arch_clear_hugepage_flags 739 static inline void arch_clear_hugepage_flags(struct page *page) { } 740 #define arch_clear_hugepage_flags arch_clear_hugepage_flags 741 #endif 742 743 #ifndef arch_make_huge_pte 744 static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, 745 vm_flags_t flags) 746 { 747 return entry; 748 } 749 #endif 750 751 static inline struct hstate *page_hstate(struct page *page) 752 { 753 VM_BUG_ON_PAGE(!PageHuge(page), page); 754 return size_to_hstate(page_size(page)); 755 } 756 757 static inline unsigned hstate_index_to_shift(unsigned index) 758 { 759 return hstates[index].order + PAGE_SHIFT; 760 } 761 762 static inline int hstate_index(struct hstate *h) 763 { 764 return h - hstates; 765 } 766 767 extern int dissolve_free_huge_page(struct page *page); 768 extern int dissolve_free_huge_pages(unsigned long start_pfn, 769 unsigned long end_pfn); 770 771 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION 772 #ifndef arch_hugetlb_migration_supported 773 static inline bool arch_hugetlb_migration_supported(struct hstate *h) 774 { 775 if ((huge_page_shift(h) == PMD_SHIFT) || 776 (huge_page_shift(h) == PUD_SHIFT) || 777 (huge_page_shift(h) == PGDIR_SHIFT)) 778 return true; 779 else 780 return false; 781 } 782 #endif 783 #else 784 static inline bool arch_hugetlb_migration_supported(struct hstate *h) 785 { 786 return false; 787 } 788 #endif 789 790 static inline bool hugepage_migration_supported(struct hstate *h) 791 { 792 return arch_hugetlb_migration_supported(h); 793 } 794 795 /* 796 * Movability check is different as compared to migration check. 797 * It determines whether or not a huge page should be placed on 798 * movable zone or not. Movability of any huge page should be 799 * required only if huge page size is supported for migration. 800 * There won't be any reason for the huge page to be movable if 801 * it is not migratable to start with. Also the size of the huge 802 * page should be large enough to be placed under a movable zone 803 * and still feasible enough to be migratable. Just the presence 804 * in movable zone does not make the migration feasible. 805 * 806 * So even though large huge page sizes like the gigantic ones 807 * are migratable they should not be movable because its not 808 * feasible to migrate them from movable zone. 809 */ 810 static inline bool hugepage_movable_supported(struct hstate *h) 811 { 812 if (!hugepage_migration_supported(h)) 813 return false; 814 815 if (hstate_is_gigantic(h)) 816 return false; 817 return true; 818 } 819 820 /* Movability of hugepages depends on migration support. */ 821 static inline gfp_t htlb_alloc_mask(struct hstate *h) 822 { 823 if (hugepage_movable_supported(h)) 824 return GFP_HIGHUSER_MOVABLE; 825 else 826 return GFP_HIGHUSER; 827 } 828 829 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask) 830 { 831 gfp_t modified_mask = htlb_alloc_mask(h); 832 833 /* Some callers might want to enforce node */ 834 modified_mask |= (gfp_mask & __GFP_THISNODE); 835 836 modified_mask |= (gfp_mask & __GFP_NOWARN); 837 838 return modified_mask; 839 } 840 841 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 842 struct mm_struct *mm, pte_t *pte) 843 { 844 if (huge_page_size(h) == PMD_SIZE) 845 return pmd_lockptr(mm, (pmd_t *) pte); 846 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE); 847 return &mm->page_table_lock; 848 } 849 850 #ifndef hugepages_supported 851 /* 852 * Some platform decide whether they support huge pages at boot 853 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0 854 * when there is no such support 855 */ 856 #define hugepages_supported() (HPAGE_SHIFT != 0) 857 #endif 858 859 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm); 860 861 static inline void hugetlb_count_add(long l, struct mm_struct *mm) 862 { 863 atomic_long_add(l, &mm->hugetlb_usage); 864 } 865 866 static inline void hugetlb_count_sub(long l, struct mm_struct *mm) 867 { 868 atomic_long_sub(l, &mm->hugetlb_usage); 869 } 870 871 #ifndef set_huge_swap_pte_at 872 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr, 873 pte_t *ptep, pte_t pte, unsigned long sz) 874 { 875 set_huge_pte_at(mm, addr, ptep, pte); 876 } 877 #endif 878 879 #ifndef huge_ptep_modify_prot_start 880 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start 881 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma, 882 unsigned long addr, pte_t *ptep) 883 { 884 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); 885 } 886 #endif 887 888 #ifndef huge_ptep_modify_prot_commit 889 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit 890 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, 891 unsigned long addr, pte_t *ptep, 892 pte_t old_pte, pte_t pte) 893 { 894 set_huge_pte_at(vma->vm_mm, addr, ptep, pte); 895 } 896 #endif 897 898 #else /* CONFIG_HUGETLB_PAGE */ 899 struct hstate {}; 900 901 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage) 902 { 903 return NULL; 904 } 905 906 static inline int isolate_or_dissolve_huge_page(struct page *page, 907 struct list_head *list) 908 { 909 return -ENOMEM; 910 } 911 912 static inline struct page *alloc_huge_page(struct vm_area_struct *vma, 913 unsigned long addr, 914 int avoid_reserve) 915 { 916 return NULL; 917 } 918 919 static inline struct page * 920 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, 921 nodemask_t *nmask, gfp_t gfp_mask) 922 { 923 return NULL; 924 } 925 926 static inline struct page *alloc_huge_page_vma(struct hstate *h, 927 struct vm_area_struct *vma, 928 unsigned long address) 929 { 930 return NULL; 931 } 932 933 static inline int __alloc_bootmem_huge_page(struct hstate *h) 934 { 935 return 0; 936 } 937 938 static inline struct hstate *hstate_file(struct file *f) 939 { 940 return NULL; 941 } 942 943 static inline struct hstate *hstate_sizelog(int page_size_log) 944 { 945 return NULL; 946 } 947 948 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 949 { 950 return NULL; 951 } 952 953 static inline struct hstate *page_hstate(struct page *page) 954 { 955 return NULL; 956 } 957 958 static inline unsigned long huge_page_size(struct hstate *h) 959 { 960 return PAGE_SIZE; 961 } 962 963 static inline unsigned long huge_page_mask(struct hstate *h) 964 { 965 return PAGE_MASK; 966 } 967 968 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) 969 { 970 return PAGE_SIZE; 971 } 972 973 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) 974 { 975 return PAGE_SIZE; 976 } 977 978 static inline unsigned int huge_page_order(struct hstate *h) 979 { 980 return 0; 981 } 982 983 static inline unsigned int huge_page_shift(struct hstate *h) 984 { 985 return PAGE_SHIFT; 986 } 987 988 static inline bool hstate_is_gigantic(struct hstate *h) 989 { 990 return false; 991 } 992 993 static inline unsigned int pages_per_huge_page(struct hstate *h) 994 { 995 return 1; 996 } 997 998 static inline unsigned hstate_index_to_shift(unsigned index) 999 { 1000 return 0; 1001 } 1002 1003 static inline int hstate_index(struct hstate *h) 1004 { 1005 return 0; 1006 } 1007 1008 static inline int dissolve_free_huge_page(struct page *page) 1009 { 1010 return 0; 1011 } 1012 1013 static inline int dissolve_free_huge_pages(unsigned long start_pfn, 1014 unsigned long end_pfn) 1015 { 1016 return 0; 1017 } 1018 1019 static inline bool hugepage_migration_supported(struct hstate *h) 1020 { 1021 return false; 1022 } 1023 1024 static inline bool hugepage_movable_supported(struct hstate *h) 1025 { 1026 return false; 1027 } 1028 1029 static inline gfp_t htlb_alloc_mask(struct hstate *h) 1030 { 1031 return 0; 1032 } 1033 1034 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask) 1035 { 1036 return 0; 1037 } 1038 1039 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 1040 struct mm_struct *mm, pte_t *pte) 1041 { 1042 return &mm->page_table_lock; 1043 } 1044 1045 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m) 1046 { 1047 } 1048 1049 static inline void hugetlb_count_sub(long l, struct mm_struct *mm) 1050 { 1051 } 1052 1053 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr, 1054 pte_t *ptep, pte_t pte, unsigned long sz) 1055 { 1056 } 1057 #endif /* CONFIG_HUGETLB_PAGE */ 1058 1059 #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP 1060 extern bool hugetlb_free_vmemmap_enabled; 1061 #else 1062 #define hugetlb_free_vmemmap_enabled false 1063 #endif 1064 1065 static inline spinlock_t *huge_pte_lock(struct hstate *h, 1066 struct mm_struct *mm, pte_t *pte) 1067 { 1068 spinlock_t *ptl; 1069 1070 ptl = huge_pte_lockptr(h, mm, pte); 1071 spin_lock(ptl); 1072 return ptl; 1073 } 1074 1075 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA) 1076 extern void __init hugetlb_cma_reserve(int order); 1077 extern void __init hugetlb_cma_check(void); 1078 #else 1079 static inline __init void hugetlb_cma_reserve(int order) 1080 { 1081 } 1082 static inline __init void hugetlb_cma_check(void) 1083 { 1084 } 1085 #endif 1086 1087 bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr); 1088 1089 #ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE 1090 /* 1091 * ARCHes with special requirements for evicting HUGETLB backing TLB entries can 1092 * implement this. 1093 */ 1094 #define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end) 1095 #endif 1096 1097 #endif /* _LINUX_HUGETLB_H */ 1098