1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_HUGETLB_H
3 #define _LINUX_HUGETLB_H
6 #include <linux/mm_types.h>
7 #include <linux/mmdebug.h>
9 #include <linux/hugetlb_inline.h>
10 #include <linux/cgroup.h>
11 #include <linux/page_ref.h>
12 #include <linux/list.h>
13 #include <linux/kref.h>
14 #include <linux/pgtable.h>
15 #include <linux/gfp.h>
16 #include <linux/userfaultfd_k.h>
23 #ifndef CONFIG_ARCH_HAS_HUGEPD
24 typedef struct { unsigned long pd; } hugepd_t;
25 #define is_hugepd(hugepd) (0)
26 #define __hugepd(x) ((hugepd_t) { (x) })
29 #ifdef CONFIG_HUGETLB_PAGE
31 #include <linux/mempolicy.h>
32 #include <linux/shm.h>
33 #include <asm/tlbflush.h>
36 * For HugeTLB page, there are more metadata to save in the struct page. But
37 * the head struct page cannot meet our needs, so we have to abuse other tail
38 * struct page to store the metadata.
40 #define __NR_USED_SUBPAGE 3
42 struct hugepage_subpool {
45 long max_hpages; /* Maximum huge pages or -1 if no maximum. */
46 long used_hpages; /* Used count against maximum, includes */
47 /* both allocated and reserved pages. */
48 struct hstate *hstate;
49 long min_hpages; /* Minimum huge pages or -1 if no minimum. */
50 long rsv_hpages; /* Pages reserved against global pool to */
51 /* satisfy minimum size. */
57 struct list_head regions;
58 long adds_in_progress;
59 struct list_head region_cache;
60 long region_cache_count;
61 #ifdef CONFIG_CGROUP_HUGETLB
63 * On private mappings, the counter to uncharge reservations is stored
64 * here. If these fields are 0, then either the mapping is shared, or
65 * cgroup accounting is disabled for this resv_map.
67 struct page_counter *reservation_counter;
68 unsigned long pages_per_hpage;
69 struct cgroup_subsys_state *css;
74 * Region tracking -- allows tracking of reservations and instantiated pages
75 * across the pages in a mapping.
77 * The region data structures are embedded into a resv_map and protected
78 * by a resv_map's lock. The set of regions within the resv_map represent
79 * reservations for huge pages, or huge pages that have already been
80 * instantiated within the map. The from and to elements are huge page
81 * indices into the associated mapping. from indicates the starting index
82 * of the region. to represents the first index past the end of the region.
84 * For example, a file region structure with from == 0 and to == 4 represents
85 * four huge pages in a mapping. It is important to note that the to element
86 * represents the first element past the end of the region. This is used in
87 * arithmetic as 4(to) - 0(from) = 4 huge pages in the region.
89 * Interval notation of the form [from, to) will be used to indicate that
90 * the endpoint from is inclusive and to is exclusive.
93 struct list_head link;
96 #ifdef CONFIG_CGROUP_HUGETLB
98 * On shared mappings, each reserved region appears as a struct
99 * file_region in resv_map. These fields hold the info needed to
100 * uncharge each reservation.
102 struct page_counter *reservation_counter;
103 struct cgroup_subsys_state *css;
107 struct hugetlb_vma_lock {
109 struct rw_semaphore rw_sema;
110 struct vm_area_struct *vma;
113 extern struct resv_map *resv_map_alloc(void);
114 void resv_map_release(struct kref *ref);
116 extern spinlock_t hugetlb_lock;
117 extern int hugetlb_max_hstate __read_mostly;
118 #define for_each_hstate(h) \
119 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
121 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
123 void hugepage_put_subpool(struct hugepage_subpool *spool);
125 void hugetlb_dup_vma_private(struct vm_area_struct *vma);
126 void clear_vma_resv_huge_pages(struct vm_area_struct *vma);
127 int move_hugetlb_page_tables(struct vm_area_struct *vma,
128 struct vm_area_struct *new_vma,
129 unsigned long old_addr, unsigned long new_addr,
131 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *,
132 struct vm_area_struct *, struct vm_area_struct *);
133 struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
134 unsigned long address, unsigned int flags);
135 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
136 struct page **, unsigned long *, unsigned long *,
137 long, unsigned int, int *);
138 void unmap_hugepage_range(struct vm_area_struct *,
139 unsigned long, unsigned long, struct page *,
141 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
142 struct vm_area_struct *vma,
143 unsigned long start, unsigned long end,
144 struct page *ref_page, zap_flags_t zap_flags);
145 void hugetlb_report_meminfo(struct seq_file *);
146 int hugetlb_report_node_meminfo(char *buf, int len, int nid);
147 void hugetlb_show_meminfo_node(int nid);
148 unsigned long hugetlb_total_pages(void);
149 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
150 unsigned long address, unsigned int flags);
151 #ifdef CONFIG_USERFAULTFD
152 int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
153 struct vm_area_struct *dst_vma,
154 unsigned long dst_addr,
155 unsigned long src_addr,
157 struct folio **foliop);
158 #endif /* CONFIG_USERFAULTFD */
159 bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
160 struct vm_area_struct *vma,
161 vm_flags_t vm_flags);
162 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
164 bool isolate_hugetlb(struct folio *folio, struct list_head *list);
165 int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison);
166 int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
167 bool *migratable_cleared);
168 void folio_putback_active_hugetlb(struct folio *folio);
169 void move_hugetlb_state(struct folio *old_folio, struct folio *new_folio, int reason);
170 void free_huge_page(struct page *page);
171 void hugetlb_fix_reserve_counts(struct inode *inode);
172 extern struct mutex *hugetlb_fault_mutex_table;
173 u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
175 pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
176 unsigned long addr, pud_t *pud);
178 struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
180 extern int sysctl_hugetlb_shm_group;
181 extern struct list_head huge_boot_pages;
185 #ifndef CONFIG_HIGHPTE
187 * pte_offset_huge() and pte_alloc_huge() are helpers for those architectures
188 * which may go down to the lowest PTE level in their huge_pte_offset() and
189 * huge_pte_alloc(): to avoid reliance on pte_offset_map() without pte_unmap().
191 static inline pte_t *pte_offset_huge(pmd_t *pmd, unsigned long address)
193 return pte_offset_kernel(pmd, address);
195 static inline pte_t *pte_alloc_huge(struct mm_struct *mm, pmd_t *pmd,
196 unsigned long address)
198 return pte_alloc(mm, pmd) ? NULL : pte_offset_huge(pmd, address);
202 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
203 unsigned long addr, unsigned long sz);
205 * huge_pte_offset(): Walk the hugetlb pgtable until the last level PTE.
206 * Returns the pte_t* if found, or NULL if the address is not mapped.
208 * IMPORTANT: we should normally not directly call this function, instead
209 * this is only a common interface to implement arch-specific
210 * walker. Please use hugetlb_walk() instead, because that will attempt to
211 * verify the locking for you.
213 * Since this function will walk all the pgtable pages (including not only
214 * high-level pgtable page, but also PUD entry that can be unshared
215 * concurrently for VM_SHARED), the caller of this function should be
216 * responsible of its thread safety. One can follow this rule:
218 * (1) For private mappings: pmd unsharing is not possible, so holding the
219 * mmap_lock for either read or write is sufficient. Most callers
220 * already hold the mmap_lock, so normally, no special action is
223 * (2) For shared mappings: pmd unsharing is possible (so the PUD-ranged
224 * pgtable page can go away from under us! It can be done by a pmd
225 * unshare with a follow up munmap() on the other process), then we
228 * (2.1) hugetlb vma lock read or write held, to make sure pmd unshare
229 * won't happen upon the range (it also makes sure the pte_t we
230 * read is the right and stable one), or,
232 * (2.2) hugetlb mapping i_mmap_rwsem lock held read or write, to make
233 * sure even if unshare happened the racy unmap() will wait until
234 * i_mmap_rwsem is released.
236 * Option (2.1) is the safest, which guarantees pte stability from pmd
237 * sharing pov, until the vma lock released. Option (2.2) doesn't protect
238 * a concurrent pmd unshare, but it makes sure the pgtable page is safe to
241 pte_t *huge_pte_offset(struct mm_struct *mm,
242 unsigned long addr, unsigned long sz);
243 unsigned long hugetlb_mask_last_page(struct hstate *h);
244 int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
245 unsigned long addr, pte_t *ptep);
246 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
247 unsigned long *start, unsigned long *end);
249 void hugetlb_vma_lock_read(struct vm_area_struct *vma);
250 void hugetlb_vma_unlock_read(struct vm_area_struct *vma);
251 void hugetlb_vma_lock_write(struct vm_area_struct *vma);
252 void hugetlb_vma_unlock_write(struct vm_area_struct *vma);
253 int hugetlb_vma_trylock_write(struct vm_area_struct *vma);
254 void hugetlb_vma_assert_locked(struct vm_area_struct *vma);
255 void hugetlb_vma_lock_release(struct kref *kref);
257 int pmd_huge(pmd_t pmd);
258 int pud_huge(pud_t pud);
259 long hugetlb_change_protection(struct vm_area_struct *vma,
260 unsigned long address, unsigned long end, pgprot_t newprot,
261 unsigned long cp_flags);
263 bool is_hugetlb_entry_migration(pte_t pte);
264 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
266 #else /* !CONFIG_HUGETLB_PAGE */
268 static inline void hugetlb_dup_vma_private(struct vm_area_struct *vma)
272 static inline void clear_vma_resv_huge_pages(struct vm_area_struct *vma)
276 static inline unsigned long hugetlb_total_pages(void)
281 static inline struct address_space *hugetlb_page_mapping_lock_write(
287 static inline int huge_pmd_unshare(struct mm_struct *mm,
288 struct vm_area_struct *vma,
289 unsigned long addr, pte_t *ptep)
294 static inline void adjust_range_if_pmd_sharing_possible(
295 struct vm_area_struct *vma,
296 unsigned long *start, unsigned long *end)
300 static inline struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
301 unsigned long address, unsigned int flags)
303 BUILD_BUG(); /* should never be compiled in if !CONFIG_HUGETLB_PAGE*/
306 static inline long follow_hugetlb_page(struct mm_struct *mm,
307 struct vm_area_struct *vma, struct page **pages,
308 unsigned long *position, unsigned long *nr_pages,
309 long i, unsigned int flags, int *nonblocking)
315 static inline int copy_hugetlb_page_range(struct mm_struct *dst,
316 struct mm_struct *src,
317 struct vm_area_struct *dst_vma,
318 struct vm_area_struct *src_vma)
324 static inline int move_hugetlb_page_tables(struct vm_area_struct *vma,
325 struct vm_area_struct *new_vma,
326 unsigned long old_addr,
327 unsigned long new_addr,
334 static inline void hugetlb_report_meminfo(struct seq_file *m)
338 static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
343 static inline void hugetlb_show_meminfo_node(int nid)
347 static inline int prepare_hugepage_range(struct file *file,
348 unsigned long addr, unsigned long len)
353 static inline void hugetlb_vma_lock_read(struct vm_area_struct *vma)
357 static inline void hugetlb_vma_unlock_read(struct vm_area_struct *vma)
361 static inline void hugetlb_vma_lock_write(struct vm_area_struct *vma)
365 static inline void hugetlb_vma_unlock_write(struct vm_area_struct *vma)
369 static inline int hugetlb_vma_trylock_write(struct vm_area_struct *vma)
374 static inline void hugetlb_vma_assert_locked(struct vm_area_struct *vma)
378 static inline int pmd_huge(pmd_t pmd)
383 static inline int pud_huge(pud_t pud)
388 static inline int is_hugepage_only_range(struct mm_struct *mm,
389 unsigned long addr, unsigned long len)
394 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
395 unsigned long addr, unsigned long end,
396 unsigned long floor, unsigned long ceiling)
401 #ifdef CONFIG_USERFAULTFD
402 static inline int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
403 struct vm_area_struct *dst_vma,
404 unsigned long dst_addr,
405 unsigned long src_addr,
407 struct folio **foliop)
412 #endif /* CONFIG_USERFAULTFD */
414 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
420 static inline bool isolate_hugetlb(struct folio *folio, struct list_head *list)
425 static inline int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison)
430 static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
431 bool *migratable_cleared)
436 static inline void folio_putback_active_hugetlb(struct folio *folio)
440 static inline void move_hugetlb_state(struct folio *old_folio,
441 struct folio *new_folio, int reason)
445 static inline long hugetlb_change_protection(
446 struct vm_area_struct *vma, unsigned long address,
447 unsigned long end, pgprot_t newprot,
448 unsigned long cp_flags)
453 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
454 struct vm_area_struct *vma, unsigned long start,
455 unsigned long end, struct page *ref_page,
456 zap_flags_t zap_flags)
461 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
462 struct vm_area_struct *vma, unsigned long address,
469 static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }
471 #endif /* !CONFIG_HUGETLB_PAGE */
473 * hugepages at page global directory. If arch support
474 * hugepages at pgd level, they need to define this.
477 #define pgd_huge(x) 0
480 #define p4d_huge(x) 0
484 static inline int pgd_write(pgd_t pgd)
491 #define HUGETLB_ANON_FILE "anon_hugepage"
495 * The file will be used as an shm file so shmfs accounting rules
498 HUGETLB_SHMFS_INODE = 1,
500 * The file is being created on the internal vfs mount and shmfs
501 * accounting rules do not apply
503 HUGETLB_ANONHUGE_INODE = 2,
506 #ifdef CONFIG_HUGETLBFS
507 struct hugetlbfs_sb_info {
508 long max_inodes; /* inodes allowed */
509 long free_inodes; /* inodes free */
510 spinlock_t stat_lock;
511 struct hstate *hstate;
512 struct hugepage_subpool *spool;
518 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
520 return sb->s_fs_info;
523 struct hugetlbfs_inode_info {
524 struct shared_policy policy;
525 struct inode vfs_inode;
529 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
531 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
534 extern const struct file_operations hugetlbfs_file_operations;
535 extern const struct vm_operations_struct hugetlb_vm_ops;
536 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
537 int creat_flags, int page_size_log);
539 static inline bool is_file_hugepages(struct file *file)
541 if (file->f_op == &hugetlbfs_file_operations)
544 return is_file_shm_hugepages(file);
547 static inline struct hstate *hstate_inode(struct inode *i)
549 return HUGETLBFS_SB(i->i_sb)->hstate;
551 #else /* !CONFIG_HUGETLBFS */
553 #define is_file_hugepages(file) false
554 static inline struct file *
555 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
556 int creat_flags, int page_size_log)
558 return ERR_PTR(-ENOSYS);
561 static inline struct hstate *hstate_inode(struct inode *i)
565 #endif /* !CONFIG_HUGETLBFS */
567 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
568 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
569 unsigned long len, unsigned long pgoff,
570 unsigned long flags);
571 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
574 generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
575 unsigned long len, unsigned long pgoff,
576 unsigned long flags);
579 * huegtlb page specific state flags. These flags are located in page.private
580 * of the hugetlb head page. Functions created via the below macros should be
581 * used to manipulate these flags.
583 * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
584 * allocation time. Cleared when page is fully instantiated. Free
585 * routine checks flag to restore a reservation on error paths.
586 * Synchronization: Examined or modified by code that knows it has
587 * the only reference to page. i.e. After allocation but before use
588 * or when the page is being freed.
589 * HPG_migratable - Set after a newly allocated page is added to the page
590 * cache and/or page tables. Indicates the page is a candidate for
592 * Synchronization: Initially set after new page allocation with no
593 * locking. When examined and modified during migration processing
594 * (isolate, migrate, putback) the hugetlb_lock is held.
595 * HPG_temporary - Set on a page that is temporarily allocated from the buddy
596 * allocator. Typically used for migration target pages when no pages
597 * are available in the pool. The hugetlb free page path will
598 * immediately free pages with this flag set to the buddy allocator.
599 * Synchronization: Can be set after huge page allocation from buddy when
600 * code knows it has only reference. All other examinations and
601 * modifications require hugetlb_lock.
602 * HPG_freed - Set when page is on the free lists.
603 * Synchronization: hugetlb_lock held for examination and modification.
604 * HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed.
605 * HPG_raw_hwp_unreliable - Set when the hugetlb page has a hwpoison sub-page
606 * that is not tracked by raw_hwp_page list.
608 enum hugetlb_page_flags {
609 HPG_restore_reserve = 0,
613 HPG_vmemmap_optimized,
614 HPG_raw_hwp_unreliable,
619 * Macros to create test, set and clear function definitions for
620 * hugetlb specific page flags.
622 #ifdef CONFIG_HUGETLB_PAGE
623 #define TESTHPAGEFLAG(uname, flname) \
624 static __always_inline \
625 bool folio_test_hugetlb_##flname(struct folio *folio) \
626 { void *private = &folio->private; \
627 return test_bit(HPG_##flname, private); \
629 static inline int HPage##uname(struct page *page) \
630 { return test_bit(HPG_##flname, &(page->private)); }
632 #define SETHPAGEFLAG(uname, flname) \
633 static __always_inline \
634 void folio_set_hugetlb_##flname(struct folio *folio) \
635 { void *private = &folio->private; \
636 set_bit(HPG_##flname, private); \
638 static inline void SetHPage##uname(struct page *page) \
639 { set_bit(HPG_##flname, &(page->private)); }
641 #define CLEARHPAGEFLAG(uname, flname) \
642 static __always_inline \
643 void folio_clear_hugetlb_##flname(struct folio *folio) \
644 { void *private = &folio->private; \
645 clear_bit(HPG_##flname, private); \
647 static inline void ClearHPage##uname(struct page *page) \
648 { clear_bit(HPG_##flname, &(page->private)); }
650 #define TESTHPAGEFLAG(uname, flname) \
652 folio_test_hugetlb_##flname(struct folio *folio) \
654 static inline int HPage##uname(struct page *page) \
657 #define SETHPAGEFLAG(uname, flname) \
659 folio_set_hugetlb_##flname(struct folio *folio) \
661 static inline void SetHPage##uname(struct page *page) \
664 #define CLEARHPAGEFLAG(uname, flname) \
666 folio_clear_hugetlb_##flname(struct folio *folio) \
668 static inline void ClearHPage##uname(struct page *page) \
672 #define HPAGEFLAG(uname, flname) \
673 TESTHPAGEFLAG(uname, flname) \
674 SETHPAGEFLAG(uname, flname) \
675 CLEARHPAGEFLAG(uname, flname) \
678 * Create functions associated with hugetlb page flags
680 HPAGEFLAG(RestoreReserve, restore_reserve)
681 HPAGEFLAG(Migratable, migratable)
682 HPAGEFLAG(Temporary, temporary)
683 HPAGEFLAG(Freed, freed)
684 HPAGEFLAG(VmemmapOptimized, vmemmap_optimized)
685 HPAGEFLAG(RawHwpUnreliable, raw_hwp_unreliable)
687 #ifdef CONFIG_HUGETLB_PAGE
689 #define HSTATE_NAME_LEN 32
690 /* Defines one hugetlb page size */
692 struct mutex resize_lock;
693 int next_nid_to_alloc;
694 int next_nid_to_free;
696 unsigned int demote_order;
698 unsigned long max_huge_pages;
699 unsigned long nr_huge_pages;
700 unsigned long free_huge_pages;
701 unsigned long resv_huge_pages;
702 unsigned long surplus_huge_pages;
703 unsigned long nr_overcommit_huge_pages;
704 struct list_head hugepage_activelist;
705 struct list_head hugepage_freelists[MAX_NUMNODES];
706 unsigned int max_huge_pages_node[MAX_NUMNODES];
707 unsigned int nr_huge_pages_node[MAX_NUMNODES];
708 unsigned int free_huge_pages_node[MAX_NUMNODES];
709 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
710 #ifdef CONFIG_CGROUP_HUGETLB
711 /* cgroup control files */
712 struct cftype cgroup_files_dfl[8];
713 struct cftype cgroup_files_legacy[10];
715 char name[HSTATE_NAME_LEN];
718 struct huge_bootmem_page {
719 struct list_head list;
720 struct hstate *hstate;
723 int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
724 struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
725 unsigned long addr, int avoid_reserve);
726 struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
727 nodemask_t *nmask, gfp_t gfp_mask);
728 struct folio *alloc_hugetlb_folio_vma(struct hstate *h, struct vm_area_struct *vma,
729 unsigned long address);
730 int hugetlb_add_to_page_cache(struct folio *folio, struct address_space *mapping,
732 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
733 unsigned long address, struct folio *folio);
736 int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);
737 int __init alloc_bootmem_huge_page(struct hstate *h, int nid);
738 bool __init hugetlb_node_alloc_supported(void);
740 void __init hugetlb_add_hstate(unsigned order);
741 bool __init arch_hugetlb_valid_size(unsigned long size);
742 struct hstate *size_to_hstate(unsigned long size);
744 #ifndef HUGE_MAX_HSTATE
745 #define HUGE_MAX_HSTATE 1
748 extern struct hstate hstates[HUGE_MAX_HSTATE];
749 extern unsigned int default_hstate_idx;
751 #define default_hstate (hstates[default_hstate_idx])
753 static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio)
755 return folio->_hugetlb_subpool;
758 static inline void hugetlb_set_folio_subpool(struct folio *folio,
759 struct hugepage_subpool *subpool)
761 folio->_hugetlb_subpool = subpool;
764 static inline struct hstate *hstate_file(struct file *f)
766 return hstate_inode(file_inode(f));
769 static inline struct hstate *hstate_sizelog(int page_size_log)
772 return &default_hstate;
774 if (page_size_log < BITS_PER_LONG)
775 return size_to_hstate(1UL << page_size_log);
780 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
782 return hstate_file(vma->vm_file);
785 static inline unsigned long huge_page_size(const struct hstate *h)
787 return (unsigned long)PAGE_SIZE << h->order;
790 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
792 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
794 static inline unsigned long huge_page_mask(struct hstate *h)
799 static inline unsigned int huge_page_order(struct hstate *h)
804 static inline unsigned huge_page_shift(struct hstate *h)
806 return h->order + PAGE_SHIFT;
809 static inline bool hstate_is_gigantic(struct hstate *h)
811 return huge_page_order(h) > MAX_ORDER;
814 static inline unsigned int pages_per_huge_page(const struct hstate *h)
816 return 1 << h->order;
819 static inline unsigned int blocks_per_huge_page(struct hstate *h)
821 return huge_page_size(h) / 512;
824 #include <asm/hugetlb.h>
826 #ifndef is_hugepage_only_range
827 static inline int is_hugepage_only_range(struct mm_struct *mm,
828 unsigned long addr, unsigned long len)
832 #define is_hugepage_only_range is_hugepage_only_range
835 #ifndef arch_clear_hugepage_flags
836 static inline void arch_clear_hugepage_flags(struct page *page) { }
837 #define arch_clear_hugepage_flags arch_clear_hugepage_flags
840 #ifndef arch_make_huge_pte
841 static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
844 return pte_mkhuge(entry);
848 static inline struct hstate *folio_hstate(struct folio *folio)
850 VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
851 return size_to_hstate(folio_size(folio));
854 static inline struct hstate *page_hstate(struct page *page)
856 return folio_hstate(page_folio(page));
859 static inline unsigned hstate_index_to_shift(unsigned index)
861 return hstates[index].order + PAGE_SHIFT;
864 static inline int hstate_index(struct hstate *h)
869 extern int dissolve_free_huge_page(struct page *page);
870 extern int dissolve_free_huge_pages(unsigned long start_pfn,
871 unsigned long end_pfn);
873 #ifdef CONFIG_MEMORY_FAILURE
874 extern void folio_clear_hugetlb_hwpoison(struct folio *folio);
876 static inline void folio_clear_hugetlb_hwpoison(struct folio *folio)
881 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
882 #ifndef arch_hugetlb_migration_supported
883 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
885 if ((huge_page_shift(h) == PMD_SHIFT) ||
886 (huge_page_shift(h) == PUD_SHIFT) ||
887 (huge_page_shift(h) == PGDIR_SHIFT))
894 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
900 static inline bool hugepage_migration_supported(struct hstate *h)
902 return arch_hugetlb_migration_supported(h);
906 * Movability check is different as compared to migration check.
907 * It determines whether or not a huge page should be placed on
908 * movable zone or not. Movability of any huge page should be
909 * required only if huge page size is supported for migration.
910 * There won't be any reason for the huge page to be movable if
911 * it is not migratable to start with. Also the size of the huge
912 * page should be large enough to be placed under a movable zone
913 * and still feasible enough to be migratable. Just the presence
914 * in movable zone does not make the migration feasible.
916 * So even though large huge page sizes like the gigantic ones
917 * are migratable they should not be movable because its not
918 * feasible to migrate them from movable zone.
920 static inline bool hugepage_movable_supported(struct hstate *h)
922 if (!hugepage_migration_supported(h))
925 if (hstate_is_gigantic(h))
930 /* Movability of hugepages depends on migration support. */
931 static inline gfp_t htlb_alloc_mask(struct hstate *h)
933 if (hugepage_movable_supported(h))
934 return GFP_HIGHUSER_MOVABLE;
939 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
941 gfp_t modified_mask = htlb_alloc_mask(h);
943 /* Some callers might want to enforce node */
944 modified_mask |= (gfp_mask & __GFP_THISNODE);
946 modified_mask |= (gfp_mask & __GFP_NOWARN);
948 return modified_mask;
951 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
952 struct mm_struct *mm, pte_t *pte)
954 if (huge_page_size(h) == PMD_SIZE)
955 return pmd_lockptr(mm, (pmd_t *) pte);
956 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
957 return &mm->page_table_lock;
960 #ifndef hugepages_supported
962 * Some platform decide whether they support huge pages at boot
963 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
964 * when there is no such support
966 #define hugepages_supported() (HPAGE_SHIFT != 0)
969 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
971 static inline void hugetlb_count_init(struct mm_struct *mm)
973 atomic_long_set(&mm->hugetlb_usage, 0);
976 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
978 atomic_long_add(l, &mm->hugetlb_usage);
981 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
983 atomic_long_sub(l, &mm->hugetlb_usage);
986 #ifndef huge_ptep_modify_prot_start
987 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
988 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
989 unsigned long addr, pte_t *ptep)
991 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
995 #ifndef huge_ptep_modify_prot_commit
996 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
997 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
998 unsigned long addr, pte_t *ptep,
999 pte_t old_pte, pte_t pte)
1001 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
1006 void hugetlb_register_node(struct node *node);
1007 void hugetlb_unregister_node(struct node *node);
1010 #else /* CONFIG_HUGETLB_PAGE */
1013 static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio)
1018 static inline int isolate_or_dissolve_huge_page(struct page *page,
1019 struct list_head *list)
1024 static inline struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
1031 static inline struct folio *
1032 alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
1033 nodemask_t *nmask, gfp_t gfp_mask)
1038 static inline struct folio *alloc_hugetlb_folio_vma(struct hstate *h,
1039 struct vm_area_struct *vma,
1040 unsigned long address)
1045 static inline int __alloc_bootmem_huge_page(struct hstate *h)
1050 static inline struct hstate *hstate_file(struct file *f)
1055 static inline struct hstate *hstate_sizelog(int page_size_log)
1060 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
1065 static inline struct hstate *folio_hstate(struct folio *folio)
1070 static inline struct hstate *page_hstate(struct page *page)
1075 static inline struct hstate *size_to_hstate(unsigned long size)
1080 static inline unsigned long huge_page_size(struct hstate *h)
1085 static inline unsigned long huge_page_mask(struct hstate *h)
1090 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
1095 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
1100 static inline unsigned int huge_page_order(struct hstate *h)
1105 static inline unsigned int huge_page_shift(struct hstate *h)
1110 static inline bool hstate_is_gigantic(struct hstate *h)
1115 static inline unsigned int pages_per_huge_page(struct hstate *h)
1120 static inline unsigned hstate_index_to_shift(unsigned index)
1125 static inline int hstate_index(struct hstate *h)
1130 static inline int dissolve_free_huge_page(struct page *page)
1135 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
1136 unsigned long end_pfn)
1141 static inline bool hugepage_migration_supported(struct hstate *h)
1146 static inline bool hugepage_movable_supported(struct hstate *h)
1151 static inline gfp_t htlb_alloc_mask(struct hstate *h)
1156 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
1161 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
1162 struct mm_struct *mm, pte_t *pte)
1164 return &mm->page_table_lock;
1167 static inline void hugetlb_count_init(struct mm_struct *mm)
1171 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
1175 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
1179 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
1180 unsigned long addr, pte_t *ptep)
1183 return ptep_get(ptep);
1189 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
1190 pte_t *ptep, pte_t pte)
1194 static inline void hugetlb_register_node(struct node *node)
1198 static inline void hugetlb_unregister_node(struct node *node)
1201 #endif /* CONFIG_HUGETLB_PAGE */
1203 static inline spinlock_t *huge_pte_lock(struct hstate *h,
1204 struct mm_struct *mm, pte_t *pte)
1208 ptl = huge_pte_lockptr(h, mm, pte);
1213 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
1214 extern void __init hugetlb_cma_reserve(int order);
1216 static inline __init void hugetlb_cma_reserve(int order)
1221 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
1222 static inline bool hugetlb_pmd_shared(pte_t *pte)
1224 return page_count(virt_to_page(pte)) > 1;
1227 static inline bool hugetlb_pmd_shared(pte_t *pte)
1233 bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);
1235 #ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
1237 * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
1240 #define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
1243 static inline bool __vma_shareable_lock(struct vm_area_struct *vma)
1245 return (vma->vm_flags & VM_MAYSHARE) && vma->vm_private_data;
1249 * Safe version of huge_pte_offset() to check the locks. See comments
1250 * above huge_pte_offset().
1252 static inline pte_t *
1253 hugetlb_walk(struct vm_area_struct *vma, unsigned long addr, unsigned long sz)
1255 #if defined(CONFIG_HUGETLB_PAGE) && \
1256 defined(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) && defined(CONFIG_LOCKDEP)
1257 struct hugetlb_vma_lock *vma_lock = vma->vm_private_data;
1260 * If pmd sharing possible, locking needed to safely walk the
1261 * hugetlb pgtables. More information can be found at the comment
1262 * above huge_pte_offset() in the same file.
1264 * NOTE: lockdep_is_held() is only defined with CONFIG_LOCKDEP.
1266 if (__vma_shareable_lock(vma))
1267 WARN_ON_ONCE(!lockdep_is_held(&vma_lock->rw_sema) &&
1269 &vma->vm_file->f_mapping->i_mmap_rwsem));
1271 return huge_pte_offset(vma->vm_mm, addr, sz);
1274 #endif /* _LINUX_HUGETLB_H */