1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_HUGETLB_H
3 #define _LINUX_HUGETLB_H
5 #include <linux/mm_types.h>
6 #include <linux/mmdebug.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>
21 typedef struct { unsigned long pd; } hugepd_t;
22 #define is_hugepd(hugepd) (0)
23 #define __hugepd(x) ((hugepd_t) { (x) })
26 #ifdef CONFIG_HUGETLB_PAGE
28 #include <linux/mempolicy.h>
29 #include <linux/shm.h>
30 #include <asm/tlbflush.h>
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.
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,
49 struct hugepage_subpool {
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. */
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
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.
74 struct page_counter *reservation_counter;
75 unsigned long pages_per_hpage;
76 struct cgroup_subsys_state *css;
81 * Region tracking -- allows tracking of reservations and instantiated pages
82 * across the pages in a mapping.
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.
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.
96 * Interval notation of the form [from, to) will be used to indicate that
97 * the endpoint from is inclusive and to is exclusive.
100 struct list_head link;
103 #ifdef CONFIG_CGROUP_HUGETLB
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.
109 struct page_counter *reservation_counter;
110 struct cgroup_subsys_state *css;
114 extern struct resv_map *resv_map_alloc(void);
115 void resv_map_release(struct kref *ref);
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)++)
122 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
124 void hugepage_put_subpool(struct hugepage_subpool *spool);
126 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
127 void clear_vma_resv_huge_pages(struct vm_area_struct *vma);
128 int hugetlb_sysctl_handler(struct ctl_table *, int, void *, size_t *, loff_t *);
129 int hugetlb_overcommit_handler(struct ctl_table *, int, void *, size_t *,
131 int hugetlb_treat_movable_handler(struct ctl_table *, int, void *, size_t *,
133 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, void *, size_t *,
136 int move_hugetlb_page_tables(struct vm_area_struct *vma,
137 struct vm_area_struct *new_vma,
138 unsigned long old_addr, unsigned long new_addr,
140 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
141 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
142 struct page **, struct vm_area_struct **,
143 unsigned long *, unsigned long *, long, unsigned int,
145 void unmap_hugepage_range(struct vm_area_struct *,
146 unsigned long, unsigned long, struct page *);
147 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
148 struct vm_area_struct *vma,
149 unsigned long start, unsigned long end,
150 struct page *ref_page);
151 void hugetlb_report_meminfo(struct seq_file *);
152 int hugetlb_report_node_meminfo(char *buf, int len, int nid);
153 void hugetlb_show_meminfo(void);
154 unsigned long hugetlb_total_pages(void);
155 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
156 unsigned long address, unsigned int flags);
157 #ifdef CONFIG_USERFAULTFD
158 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
159 struct vm_area_struct *dst_vma,
160 unsigned long dst_addr,
161 unsigned long src_addr,
162 enum mcopy_atomic_mode mode,
163 struct page **pagep);
164 #endif /* CONFIG_USERFAULTFD */
165 bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
166 struct vm_area_struct *vma,
167 vm_flags_t vm_flags);
168 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
170 bool isolate_huge_page(struct page *page, struct list_head *list);
171 int get_hwpoison_huge_page(struct page *page, bool *hugetlb);
172 int get_huge_page_for_hwpoison(unsigned long pfn, int flags);
173 void putback_active_hugepage(struct page *page);
174 void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
175 void free_huge_page(struct page *page);
176 void hugetlb_fix_reserve_counts(struct inode *inode);
177 extern struct mutex *hugetlb_fault_mutex_table;
178 u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
180 pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
181 unsigned long addr, pud_t *pud);
183 struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
185 extern int sysctl_hugetlb_shm_group;
186 extern struct list_head huge_boot_pages;
190 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
191 unsigned long addr, unsigned long sz);
192 pte_t *huge_pte_offset(struct mm_struct *mm,
193 unsigned long addr, unsigned long sz);
194 int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
195 unsigned long *addr, pte_t *ptep);
196 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
197 unsigned long *start, unsigned long *end);
198 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
200 struct page *follow_huge_pd(struct vm_area_struct *vma,
201 unsigned long address, hugepd_t hpd,
202 int flags, int pdshift);
203 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
204 pmd_t *pmd, int flags);
205 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
206 pud_t *pud, int flags);
207 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
208 pgd_t *pgd, int flags);
210 int pmd_huge(pmd_t pmd);
211 int pud_huge(pud_t pud);
212 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
213 unsigned long address, unsigned long end, pgprot_t newprot);
215 bool is_hugetlb_entry_migration(pte_t pte);
216 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
218 #else /* !CONFIG_HUGETLB_PAGE */
220 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
224 static inline void clear_vma_resv_huge_pages(struct vm_area_struct *vma)
228 static inline unsigned long hugetlb_total_pages(void)
233 static inline struct address_space *hugetlb_page_mapping_lock_write(
239 static inline int huge_pmd_unshare(struct mm_struct *mm,
240 struct vm_area_struct *vma,
241 unsigned long *addr, pte_t *ptep)
246 static inline void adjust_range_if_pmd_sharing_possible(
247 struct vm_area_struct *vma,
248 unsigned long *start, unsigned long *end)
252 static inline long follow_hugetlb_page(struct mm_struct *mm,
253 struct vm_area_struct *vma, struct page **pages,
254 struct vm_area_struct **vmas, unsigned long *position,
255 unsigned long *nr_pages, long i, unsigned int flags,
262 static inline struct page *follow_huge_addr(struct mm_struct *mm,
263 unsigned long address, int write)
265 return ERR_PTR(-EINVAL);
268 static inline int copy_hugetlb_page_range(struct mm_struct *dst,
269 struct mm_struct *src, struct vm_area_struct *vma)
275 static inline int move_hugetlb_page_tables(struct vm_area_struct *vma,
276 struct vm_area_struct *new_vma,
277 unsigned long old_addr,
278 unsigned long new_addr,
285 static inline void hugetlb_report_meminfo(struct seq_file *m)
289 static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
294 static inline void hugetlb_show_meminfo(void)
298 static inline struct page *follow_huge_pd(struct vm_area_struct *vma,
299 unsigned long address, hugepd_t hpd, int flags,
305 static inline struct page *follow_huge_pmd(struct mm_struct *mm,
306 unsigned long address, pmd_t *pmd, int flags)
311 static inline struct page *follow_huge_pud(struct mm_struct *mm,
312 unsigned long address, pud_t *pud, int flags)
317 static inline struct page *follow_huge_pgd(struct mm_struct *mm,
318 unsigned long address, pgd_t *pgd, int flags)
323 static inline int prepare_hugepage_range(struct file *file,
324 unsigned long addr, unsigned long len)
329 static inline int pmd_huge(pmd_t pmd)
334 static inline int pud_huge(pud_t pud)
339 static inline int is_hugepage_only_range(struct mm_struct *mm,
340 unsigned long addr, unsigned long len)
345 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
346 unsigned long addr, unsigned long end,
347 unsigned long floor, unsigned long ceiling)
352 #ifdef CONFIG_USERFAULTFD
353 static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
355 struct vm_area_struct *dst_vma,
356 unsigned long dst_addr,
357 unsigned long src_addr,
358 enum mcopy_atomic_mode mode,
364 #endif /* CONFIG_USERFAULTFD */
366 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
372 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
377 static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
382 static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags)
387 static inline void putback_active_hugepage(struct page *page)
391 static inline void move_hugetlb_state(struct page *oldpage,
392 struct page *newpage, int reason)
396 static inline unsigned long hugetlb_change_protection(
397 struct vm_area_struct *vma, unsigned long address,
398 unsigned long end, pgprot_t newprot)
403 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
404 struct vm_area_struct *vma, unsigned long start,
405 unsigned long end, struct page *ref_page)
410 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
411 struct vm_area_struct *vma, unsigned long address,
418 static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }
420 #endif /* !CONFIG_HUGETLB_PAGE */
422 * hugepages at page global directory. If arch support
423 * hugepages at pgd level, they need to define this.
426 #define pgd_huge(x) 0
429 #define p4d_huge(x) 0
433 static inline int pgd_write(pgd_t pgd)
440 #define HUGETLB_ANON_FILE "anon_hugepage"
444 * The file will be used as an shm file so shmfs accounting rules
447 HUGETLB_SHMFS_INODE = 1,
449 * The file is being created on the internal vfs mount and shmfs
450 * accounting rules do not apply
452 HUGETLB_ANONHUGE_INODE = 2,
455 #ifdef CONFIG_HUGETLBFS
456 struct hugetlbfs_sb_info {
457 long max_inodes; /* inodes allowed */
458 long free_inodes; /* inodes free */
459 spinlock_t stat_lock;
460 struct hstate *hstate;
461 struct hugepage_subpool *spool;
467 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
469 return sb->s_fs_info;
472 struct hugetlbfs_inode_info {
473 struct shared_policy policy;
474 struct inode vfs_inode;
478 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
480 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
483 extern const struct file_operations hugetlbfs_file_operations;
484 extern const struct vm_operations_struct hugetlb_vm_ops;
485 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
486 int creat_flags, int page_size_log);
488 static inline bool is_file_hugepages(struct file *file)
490 if (file->f_op == &hugetlbfs_file_operations)
493 return is_file_shm_hugepages(file);
496 static inline struct hstate *hstate_inode(struct inode *i)
498 return HUGETLBFS_SB(i->i_sb)->hstate;
500 #else /* !CONFIG_HUGETLBFS */
502 #define is_file_hugepages(file) false
503 static inline struct file *
504 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
505 int creat_flags, int page_size_log)
507 return ERR_PTR(-ENOSYS);
510 static inline struct hstate *hstate_inode(struct inode *i)
514 #endif /* !CONFIG_HUGETLBFS */
516 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
517 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
518 unsigned long len, unsigned long pgoff,
519 unsigned long flags);
520 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
523 * huegtlb page specific state flags. These flags are located in page.private
524 * of the hugetlb head page. Functions created via the below macros should be
525 * used to manipulate these flags.
527 * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
528 * allocation time. Cleared when page is fully instantiated. Free
529 * routine checks flag to restore a reservation on error paths.
530 * Synchronization: Examined or modified by code that knows it has
531 * the only reference to page. i.e. After allocation but before use
532 * or when the page is being freed.
533 * HPG_migratable - Set after a newly allocated page is added to the page
534 * cache and/or page tables. Indicates the page is a candidate for
536 * Synchronization: Initially set after new page allocation with no
537 * locking. When examined and modified during migration processing
538 * (isolate, migrate, putback) the hugetlb_lock is held.
539 * HPG_temporary - - Set on a page that is temporarily allocated from the buddy
540 * allocator. Typically used for migration target pages when no pages
541 * are available in the pool. The hugetlb free page path will
542 * immediately free pages with this flag set to the buddy allocator.
543 * Synchronization: Can be set after huge page allocation from buddy when
544 * code knows it has only reference. All other examinations and
545 * modifications require hugetlb_lock.
546 * HPG_freed - Set when page is on the free lists.
547 * Synchronization: hugetlb_lock held for examination and modification.
548 * HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed.
550 enum hugetlb_page_flags {
551 HPG_restore_reserve = 0,
555 HPG_vmemmap_optimized,
560 * Macros to create test, set and clear function definitions for
561 * hugetlb specific page flags.
563 #ifdef CONFIG_HUGETLB_PAGE
564 #define TESTHPAGEFLAG(uname, flname) \
565 static inline int HPage##uname(struct page *page) \
566 { return test_bit(HPG_##flname, &(page->private)); }
568 #define SETHPAGEFLAG(uname, flname) \
569 static inline void SetHPage##uname(struct page *page) \
570 { set_bit(HPG_##flname, &(page->private)); }
572 #define CLEARHPAGEFLAG(uname, flname) \
573 static inline void ClearHPage##uname(struct page *page) \
574 { clear_bit(HPG_##flname, &(page->private)); }
576 #define TESTHPAGEFLAG(uname, flname) \
577 static inline int HPage##uname(struct page *page) \
580 #define SETHPAGEFLAG(uname, flname) \
581 static inline void SetHPage##uname(struct page *page) \
584 #define CLEARHPAGEFLAG(uname, flname) \
585 static inline void ClearHPage##uname(struct page *page) \
589 #define HPAGEFLAG(uname, flname) \
590 TESTHPAGEFLAG(uname, flname) \
591 SETHPAGEFLAG(uname, flname) \
592 CLEARHPAGEFLAG(uname, flname) \
595 * Create functions associated with hugetlb page flags
597 HPAGEFLAG(RestoreReserve, restore_reserve)
598 HPAGEFLAG(Migratable, migratable)
599 HPAGEFLAG(Temporary, temporary)
600 HPAGEFLAG(Freed, freed)
601 HPAGEFLAG(VmemmapOptimized, vmemmap_optimized)
603 #ifdef CONFIG_HUGETLB_PAGE
605 #define HSTATE_NAME_LEN 32
606 /* Defines one hugetlb page size */
608 struct mutex resize_lock;
609 int next_nid_to_alloc;
610 int next_nid_to_free;
612 unsigned int demote_order;
614 unsigned long max_huge_pages;
615 unsigned long nr_huge_pages;
616 unsigned long free_huge_pages;
617 unsigned long resv_huge_pages;
618 unsigned long surplus_huge_pages;
619 unsigned long nr_overcommit_huge_pages;
620 struct list_head hugepage_activelist;
621 struct list_head hugepage_freelists[MAX_NUMNODES];
622 unsigned int max_huge_pages_node[MAX_NUMNODES];
623 unsigned int nr_huge_pages_node[MAX_NUMNODES];
624 unsigned int free_huge_pages_node[MAX_NUMNODES];
625 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
626 #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
627 unsigned int nr_free_vmemmap_pages;
629 #ifdef CONFIG_CGROUP_HUGETLB
630 /* cgroup control files */
631 struct cftype cgroup_files_dfl[8];
632 struct cftype cgroup_files_legacy[10];
634 char name[HSTATE_NAME_LEN];
637 struct huge_bootmem_page {
638 struct list_head list;
639 struct hstate *hstate;
642 int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
643 struct page *alloc_huge_page(struct vm_area_struct *vma,
644 unsigned long addr, int avoid_reserve);
645 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
646 nodemask_t *nmask, gfp_t gfp_mask);
647 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
648 unsigned long address);
649 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
651 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
652 unsigned long address, struct page *page);
655 int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);
656 int __init alloc_bootmem_huge_page(struct hstate *h, int nid);
657 bool __init hugetlb_node_alloc_supported(void);
659 void __init hugetlb_add_hstate(unsigned order);
660 bool __init arch_hugetlb_valid_size(unsigned long size);
661 struct hstate *size_to_hstate(unsigned long size);
663 #ifndef HUGE_MAX_HSTATE
664 #define HUGE_MAX_HSTATE 1
667 extern struct hstate hstates[HUGE_MAX_HSTATE];
668 extern unsigned int default_hstate_idx;
670 #define default_hstate (hstates[default_hstate_idx])
673 * hugetlb page subpool pointer located in hpage[1].private
675 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
677 return (void *)page_private(hpage + SUBPAGE_INDEX_SUBPOOL);
680 static inline void hugetlb_set_page_subpool(struct page *hpage,
681 struct hugepage_subpool *subpool)
683 set_page_private(hpage + SUBPAGE_INDEX_SUBPOOL, (unsigned long)subpool);
686 static inline struct hstate *hstate_file(struct file *f)
688 return hstate_inode(file_inode(f));
691 static inline struct hstate *hstate_sizelog(int page_size_log)
694 return &default_hstate;
696 return size_to_hstate(1UL << page_size_log);
699 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
701 return hstate_file(vma->vm_file);
704 static inline unsigned long huge_page_size(struct hstate *h)
706 return (unsigned long)PAGE_SIZE << h->order;
709 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
711 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
713 static inline unsigned long huge_page_mask(struct hstate *h)
718 static inline unsigned int huge_page_order(struct hstate *h)
723 static inline unsigned huge_page_shift(struct hstate *h)
725 return h->order + PAGE_SHIFT;
728 static inline bool hstate_is_gigantic(struct hstate *h)
730 return huge_page_order(h) >= MAX_ORDER;
733 static inline unsigned int pages_per_huge_page(struct hstate *h)
735 return 1 << h->order;
738 static inline unsigned int blocks_per_huge_page(struct hstate *h)
740 return huge_page_size(h) / 512;
743 #include <asm/hugetlb.h>
745 #ifndef is_hugepage_only_range
746 static inline int is_hugepage_only_range(struct mm_struct *mm,
747 unsigned long addr, unsigned long len)
751 #define is_hugepage_only_range is_hugepage_only_range
754 #ifndef arch_clear_hugepage_flags
755 static inline void arch_clear_hugepage_flags(struct page *page) { }
756 #define arch_clear_hugepage_flags arch_clear_hugepage_flags
759 #ifndef arch_make_huge_pte
760 static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
763 return pte_mkhuge(entry);
767 static inline struct hstate *page_hstate(struct page *page)
769 VM_BUG_ON_PAGE(!PageHuge(page), page);
770 return size_to_hstate(page_size(page));
773 static inline unsigned hstate_index_to_shift(unsigned index)
775 return hstates[index].order + PAGE_SHIFT;
778 static inline int hstate_index(struct hstate *h)
783 extern int dissolve_free_huge_page(struct page *page);
784 extern int dissolve_free_huge_pages(unsigned long start_pfn,
785 unsigned long end_pfn);
787 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
788 #ifndef arch_hugetlb_migration_supported
789 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
791 if ((huge_page_shift(h) == PMD_SHIFT) ||
792 (huge_page_shift(h) == PUD_SHIFT) ||
793 (huge_page_shift(h) == PGDIR_SHIFT))
800 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
806 static inline bool hugepage_migration_supported(struct hstate *h)
808 return arch_hugetlb_migration_supported(h);
812 * Movability check is different as compared to migration check.
813 * It determines whether or not a huge page should be placed on
814 * movable zone or not. Movability of any huge page should be
815 * required only if huge page size is supported for migration.
816 * There won't be any reason for the huge page to be movable if
817 * it is not migratable to start with. Also the size of the huge
818 * page should be large enough to be placed under a movable zone
819 * and still feasible enough to be migratable. Just the presence
820 * in movable zone does not make the migration feasible.
822 * So even though large huge page sizes like the gigantic ones
823 * are migratable they should not be movable because its not
824 * feasible to migrate them from movable zone.
826 static inline bool hugepage_movable_supported(struct hstate *h)
828 if (!hugepage_migration_supported(h))
831 if (hstate_is_gigantic(h))
836 /* Movability of hugepages depends on migration support. */
837 static inline gfp_t htlb_alloc_mask(struct hstate *h)
839 if (hugepage_movable_supported(h))
840 return GFP_HIGHUSER_MOVABLE;
845 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
847 gfp_t modified_mask = htlb_alloc_mask(h);
849 /* Some callers might want to enforce node */
850 modified_mask |= (gfp_mask & __GFP_THISNODE);
852 modified_mask |= (gfp_mask & __GFP_NOWARN);
854 return modified_mask;
857 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
858 struct mm_struct *mm, pte_t *pte)
860 if (huge_page_size(h) == PMD_SIZE)
861 return pmd_lockptr(mm, (pmd_t *) pte);
862 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
863 return &mm->page_table_lock;
866 #ifndef hugepages_supported
868 * Some platform decide whether they support huge pages at boot
869 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
870 * when there is no such support
872 #define hugepages_supported() (HPAGE_SHIFT != 0)
875 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
877 static inline void hugetlb_count_init(struct mm_struct *mm)
879 atomic_long_set(&mm->hugetlb_usage, 0);
882 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
884 atomic_long_add(l, &mm->hugetlb_usage);
887 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
889 atomic_long_sub(l, &mm->hugetlb_usage);
892 #ifndef set_huge_swap_pte_at
893 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
894 pte_t *ptep, pte_t pte, unsigned long sz)
896 set_huge_pte_at(mm, addr, ptep, pte);
900 #ifndef huge_ptep_modify_prot_start
901 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
902 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
903 unsigned long addr, pte_t *ptep)
905 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
909 #ifndef huge_ptep_modify_prot_commit
910 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
911 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
912 unsigned long addr, pte_t *ptep,
913 pte_t old_pte, pte_t pte)
915 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
919 #else /* CONFIG_HUGETLB_PAGE */
922 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
927 static inline int isolate_or_dissolve_huge_page(struct page *page,
928 struct list_head *list)
933 static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
940 static inline struct page *
941 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
942 nodemask_t *nmask, gfp_t gfp_mask)
947 static inline struct page *alloc_huge_page_vma(struct hstate *h,
948 struct vm_area_struct *vma,
949 unsigned long address)
954 static inline int __alloc_bootmem_huge_page(struct hstate *h)
959 static inline struct hstate *hstate_file(struct file *f)
964 static inline struct hstate *hstate_sizelog(int page_size_log)
969 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
974 static inline struct hstate *page_hstate(struct page *page)
979 static inline struct hstate *size_to_hstate(unsigned long size)
984 static inline unsigned long huge_page_size(struct hstate *h)
989 static inline unsigned long huge_page_mask(struct hstate *h)
994 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
999 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
1004 static inline unsigned int huge_page_order(struct hstate *h)
1009 static inline unsigned int huge_page_shift(struct hstate *h)
1014 static inline bool hstate_is_gigantic(struct hstate *h)
1019 static inline unsigned int pages_per_huge_page(struct hstate *h)
1024 static inline unsigned hstate_index_to_shift(unsigned index)
1029 static inline int hstate_index(struct hstate *h)
1034 static inline int dissolve_free_huge_page(struct page *page)
1039 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
1040 unsigned long end_pfn)
1045 static inline bool hugepage_migration_supported(struct hstate *h)
1050 static inline bool hugepage_movable_supported(struct hstate *h)
1055 static inline gfp_t htlb_alloc_mask(struct hstate *h)
1060 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
1065 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
1066 struct mm_struct *mm, pte_t *pte)
1068 return &mm->page_table_lock;
1071 static inline void hugetlb_count_init(struct mm_struct *mm)
1075 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
1079 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
1083 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
1084 pte_t *ptep, pte_t pte, unsigned long sz)
1087 #endif /* CONFIG_HUGETLB_PAGE */
1089 static inline spinlock_t *huge_pte_lock(struct hstate *h,
1090 struct mm_struct *mm, pte_t *pte)
1094 ptl = huge_pte_lockptr(h, mm, pte);
1099 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
1100 extern void __init hugetlb_cma_reserve(int order);
1101 extern void __init hugetlb_cma_check(void);
1103 static inline __init void hugetlb_cma_reserve(int order)
1106 static inline __init void hugetlb_cma_check(void)
1111 bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);
1113 #ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
1115 * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
1118 #define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
1121 #endif /* _LINUX_HUGETLB_H */