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,
165 #endif /* CONFIG_USERFAULTFD */
166 bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
167 struct vm_area_struct *vma,
168 vm_flags_t vm_flags);
169 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
171 bool isolate_huge_page(struct page *page, struct list_head *list);
172 int get_hwpoison_huge_page(struct page *page, bool *hugetlb);
173 int get_huge_page_for_hwpoison(unsigned long pfn, int flags);
174 void putback_active_hugepage(struct page *page);
175 void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
176 void free_huge_page(struct page *page);
177 void hugetlb_fix_reserve_counts(struct inode *inode);
178 extern struct mutex *hugetlb_fault_mutex_table;
179 u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
181 pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
182 unsigned long addr, pud_t *pud);
184 struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
186 extern int sysctl_hugetlb_shm_group;
187 extern struct list_head huge_boot_pages;
191 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
192 unsigned long addr, unsigned long sz);
193 pte_t *huge_pte_offset(struct mm_struct *mm,
194 unsigned long addr, unsigned long sz);
195 int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
196 unsigned long *addr, pte_t *ptep);
197 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
198 unsigned long *start, unsigned long *end);
199 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
201 struct page *follow_huge_pd(struct vm_area_struct *vma,
202 unsigned long address, hugepd_t hpd,
203 int flags, int pdshift);
204 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
205 pmd_t *pmd, int flags);
206 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
207 pud_t *pud, int flags);
208 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
209 pgd_t *pgd, int flags);
211 int pmd_huge(pmd_t pmd);
212 int pud_huge(pud_t pud);
213 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
214 unsigned long address, unsigned long end, pgprot_t newprot);
216 bool is_hugetlb_entry_migration(pte_t pte);
217 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
219 #else /* !CONFIG_HUGETLB_PAGE */
221 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
225 static inline void clear_vma_resv_huge_pages(struct vm_area_struct *vma)
229 static inline unsigned long hugetlb_total_pages(void)
234 static inline struct address_space *hugetlb_page_mapping_lock_write(
240 static inline int huge_pmd_unshare(struct mm_struct *mm,
241 struct vm_area_struct *vma,
242 unsigned long *addr, pte_t *ptep)
247 static inline void adjust_range_if_pmd_sharing_possible(
248 struct vm_area_struct *vma,
249 unsigned long *start, unsigned long *end)
253 static inline long follow_hugetlb_page(struct mm_struct *mm,
254 struct vm_area_struct *vma, struct page **pages,
255 struct vm_area_struct **vmas, unsigned long *position,
256 unsigned long *nr_pages, long i, unsigned int flags,
263 static inline struct page *follow_huge_addr(struct mm_struct *mm,
264 unsigned long address, int write)
266 return ERR_PTR(-EINVAL);
269 static inline int copy_hugetlb_page_range(struct mm_struct *dst,
270 struct mm_struct *src, struct vm_area_struct *vma)
276 static inline int move_hugetlb_page_tables(struct vm_area_struct *vma,
277 struct vm_area_struct *new_vma,
278 unsigned long old_addr,
279 unsigned long new_addr,
286 static inline void hugetlb_report_meminfo(struct seq_file *m)
290 static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
295 static inline void hugetlb_show_meminfo(void)
299 static inline struct page *follow_huge_pd(struct vm_area_struct *vma,
300 unsigned long address, hugepd_t hpd, int flags,
306 static inline struct page *follow_huge_pmd(struct mm_struct *mm,
307 unsigned long address, pmd_t *pmd, int flags)
312 static inline struct page *follow_huge_pud(struct mm_struct *mm,
313 unsigned long address, pud_t *pud, int flags)
318 static inline struct page *follow_huge_pgd(struct mm_struct *mm,
319 unsigned long address, pgd_t *pgd, int flags)
324 static inline int prepare_hugepage_range(struct file *file,
325 unsigned long addr, unsigned long len)
330 static inline int pmd_huge(pmd_t pmd)
335 static inline int pud_huge(pud_t pud)
340 static inline int is_hugepage_only_range(struct mm_struct *mm,
341 unsigned long addr, unsigned long len)
346 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
347 unsigned long addr, unsigned long end,
348 unsigned long floor, unsigned long ceiling)
353 #ifdef CONFIG_USERFAULTFD
354 static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
356 struct vm_area_struct *dst_vma,
357 unsigned long dst_addr,
358 unsigned long src_addr,
359 enum mcopy_atomic_mode mode,
366 #endif /* CONFIG_USERFAULTFD */
368 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
374 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
379 static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
384 static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags)
389 static inline void putback_active_hugepage(struct page *page)
393 static inline void move_hugetlb_state(struct page *oldpage,
394 struct page *newpage, int reason)
398 static inline unsigned long hugetlb_change_protection(
399 struct vm_area_struct *vma, unsigned long address,
400 unsigned long end, pgprot_t newprot)
405 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
406 struct vm_area_struct *vma, unsigned long start,
407 unsigned long end, struct page *ref_page)
412 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
413 struct vm_area_struct *vma, unsigned long address,
420 static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }
422 #endif /* !CONFIG_HUGETLB_PAGE */
424 * hugepages at page global directory. If arch support
425 * hugepages at pgd level, they need to define this.
428 #define pgd_huge(x) 0
431 #define p4d_huge(x) 0
435 static inline int pgd_write(pgd_t pgd)
442 #define HUGETLB_ANON_FILE "anon_hugepage"
446 * The file will be used as an shm file so shmfs accounting rules
449 HUGETLB_SHMFS_INODE = 1,
451 * The file is being created on the internal vfs mount and shmfs
452 * accounting rules do not apply
454 HUGETLB_ANONHUGE_INODE = 2,
457 #ifdef CONFIG_HUGETLBFS
458 struct hugetlbfs_sb_info {
459 long max_inodes; /* inodes allowed */
460 long free_inodes; /* inodes free */
461 spinlock_t stat_lock;
462 struct hstate *hstate;
463 struct hugepage_subpool *spool;
469 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
471 return sb->s_fs_info;
474 struct hugetlbfs_inode_info {
475 struct shared_policy policy;
476 struct inode vfs_inode;
480 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
482 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
485 extern const struct file_operations hugetlbfs_file_operations;
486 extern const struct vm_operations_struct hugetlb_vm_ops;
487 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
488 int creat_flags, int page_size_log);
490 static inline bool is_file_hugepages(struct file *file)
492 if (file->f_op == &hugetlbfs_file_operations)
495 return is_file_shm_hugepages(file);
498 static inline struct hstate *hstate_inode(struct inode *i)
500 return HUGETLBFS_SB(i->i_sb)->hstate;
502 #else /* !CONFIG_HUGETLBFS */
504 #define is_file_hugepages(file) false
505 static inline struct file *
506 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
507 int creat_flags, int page_size_log)
509 return ERR_PTR(-ENOSYS);
512 static inline struct hstate *hstate_inode(struct inode *i)
516 #endif /* !CONFIG_HUGETLBFS */
518 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
519 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
520 unsigned long len, unsigned long pgoff,
521 unsigned long flags);
522 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
525 * huegtlb page specific state flags. These flags are located in page.private
526 * of the hugetlb head page. Functions created via the below macros should be
527 * used to manipulate these flags.
529 * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
530 * allocation time. Cleared when page is fully instantiated. Free
531 * routine checks flag to restore a reservation on error paths.
532 * Synchronization: Examined or modified by code that knows it has
533 * the only reference to page. i.e. After allocation but before use
534 * or when the page is being freed.
535 * HPG_migratable - Set after a newly allocated page is added to the page
536 * cache and/or page tables. Indicates the page is a candidate for
538 * Synchronization: Initially set after new page allocation with no
539 * locking. When examined and modified during migration processing
540 * (isolate, migrate, putback) the hugetlb_lock is held.
541 * HPG_temporary - - Set on a page that is temporarily allocated from the buddy
542 * allocator. Typically used for migration target pages when no pages
543 * are available in the pool. The hugetlb free page path will
544 * immediately free pages with this flag set to the buddy allocator.
545 * Synchronization: Can be set after huge page allocation from buddy when
546 * code knows it has only reference. All other examinations and
547 * modifications require hugetlb_lock.
548 * HPG_freed - Set when page is on the free lists.
549 * Synchronization: hugetlb_lock held for examination and modification.
550 * HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed.
552 enum hugetlb_page_flags {
553 HPG_restore_reserve = 0,
557 HPG_vmemmap_optimized,
562 * Macros to create test, set and clear function definitions for
563 * hugetlb specific page flags.
565 #ifdef CONFIG_HUGETLB_PAGE
566 #define TESTHPAGEFLAG(uname, flname) \
567 static inline int HPage##uname(struct page *page) \
568 { return test_bit(HPG_##flname, &(page->private)); }
570 #define SETHPAGEFLAG(uname, flname) \
571 static inline void SetHPage##uname(struct page *page) \
572 { set_bit(HPG_##flname, &(page->private)); }
574 #define CLEARHPAGEFLAG(uname, flname) \
575 static inline void ClearHPage##uname(struct page *page) \
576 { clear_bit(HPG_##flname, &(page->private)); }
578 #define TESTHPAGEFLAG(uname, flname) \
579 static inline int HPage##uname(struct page *page) \
582 #define SETHPAGEFLAG(uname, flname) \
583 static inline void SetHPage##uname(struct page *page) \
586 #define CLEARHPAGEFLAG(uname, flname) \
587 static inline void ClearHPage##uname(struct page *page) \
591 #define HPAGEFLAG(uname, flname) \
592 TESTHPAGEFLAG(uname, flname) \
593 SETHPAGEFLAG(uname, flname) \
594 CLEARHPAGEFLAG(uname, flname) \
597 * Create functions associated with hugetlb page flags
599 HPAGEFLAG(RestoreReserve, restore_reserve)
600 HPAGEFLAG(Migratable, migratable)
601 HPAGEFLAG(Temporary, temporary)
602 HPAGEFLAG(Freed, freed)
603 HPAGEFLAG(VmemmapOptimized, vmemmap_optimized)
605 #ifdef CONFIG_HUGETLB_PAGE
607 #define HSTATE_NAME_LEN 32
608 /* Defines one hugetlb page size */
610 struct mutex resize_lock;
611 int next_nid_to_alloc;
612 int next_nid_to_free;
614 unsigned int demote_order;
616 unsigned long max_huge_pages;
617 unsigned long nr_huge_pages;
618 unsigned long free_huge_pages;
619 unsigned long resv_huge_pages;
620 unsigned long surplus_huge_pages;
621 unsigned long nr_overcommit_huge_pages;
622 struct list_head hugepage_activelist;
623 struct list_head hugepage_freelists[MAX_NUMNODES];
624 unsigned int max_huge_pages_node[MAX_NUMNODES];
625 unsigned int nr_huge_pages_node[MAX_NUMNODES];
626 unsigned int free_huge_pages_node[MAX_NUMNODES];
627 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
628 #ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
629 unsigned int optimize_vmemmap_pages;
631 #ifdef CONFIG_CGROUP_HUGETLB
632 /* cgroup control files */
633 struct cftype cgroup_files_dfl[8];
634 struct cftype cgroup_files_legacy[10];
636 char name[HSTATE_NAME_LEN];
639 struct huge_bootmem_page {
640 struct list_head list;
641 struct hstate *hstate;
644 int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
645 struct page *alloc_huge_page(struct vm_area_struct *vma,
646 unsigned long addr, int avoid_reserve);
647 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
648 nodemask_t *nmask, gfp_t gfp_mask);
649 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
650 unsigned long address);
651 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
653 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
654 unsigned long address, struct page *page);
657 int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);
658 int __init alloc_bootmem_huge_page(struct hstate *h, int nid);
659 bool __init hugetlb_node_alloc_supported(void);
661 void __init hugetlb_add_hstate(unsigned order);
662 bool __init arch_hugetlb_valid_size(unsigned long size);
663 struct hstate *size_to_hstate(unsigned long size);
665 #ifndef HUGE_MAX_HSTATE
666 #define HUGE_MAX_HSTATE 1
669 extern struct hstate hstates[HUGE_MAX_HSTATE];
670 extern unsigned int default_hstate_idx;
672 #define default_hstate (hstates[default_hstate_idx])
675 * hugetlb page subpool pointer located in hpage[1].private
677 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
679 return (void *)page_private(hpage + SUBPAGE_INDEX_SUBPOOL);
682 static inline void hugetlb_set_page_subpool(struct page *hpage,
683 struct hugepage_subpool *subpool)
685 set_page_private(hpage + SUBPAGE_INDEX_SUBPOOL, (unsigned long)subpool);
688 static inline struct hstate *hstate_file(struct file *f)
690 return hstate_inode(file_inode(f));
693 static inline struct hstate *hstate_sizelog(int page_size_log)
696 return &default_hstate;
698 return size_to_hstate(1UL << page_size_log);
701 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
703 return hstate_file(vma->vm_file);
706 static inline unsigned long huge_page_size(struct hstate *h)
708 return (unsigned long)PAGE_SIZE << h->order;
711 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
713 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
715 static inline unsigned long huge_page_mask(struct hstate *h)
720 static inline unsigned int huge_page_order(struct hstate *h)
725 static inline unsigned huge_page_shift(struct hstate *h)
727 return h->order + PAGE_SHIFT;
730 static inline bool hstate_is_gigantic(struct hstate *h)
732 return huge_page_order(h) >= MAX_ORDER;
735 static inline unsigned int pages_per_huge_page(struct hstate *h)
737 return 1 << h->order;
740 static inline unsigned int blocks_per_huge_page(struct hstate *h)
742 return huge_page_size(h) / 512;
745 #include <asm/hugetlb.h>
747 #ifndef is_hugepage_only_range
748 static inline int is_hugepage_only_range(struct mm_struct *mm,
749 unsigned long addr, unsigned long len)
753 #define is_hugepage_only_range is_hugepage_only_range
756 #ifndef arch_clear_hugepage_flags
757 static inline void arch_clear_hugepage_flags(struct page *page) { }
758 #define arch_clear_hugepage_flags arch_clear_hugepage_flags
761 #ifndef arch_make_huge_pte
762 static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
765 return pte_mkhuge(entry);
769 static inline struct hstate *page_hstate(struct page *page)
771 VM_BUG_ON_PAGE(!PageHuge(page), page);
772 return size_to_hstate(page_size(page));
775 static inline unsigned hstate_index_to_shift(unsigned index)
777 return hstates[index].order + PAGE_SHIFT;
780 static inline int hstate_index(struct hstate *h)
785 extern int dissolve_free_huge_page(struct page *page);
786 extern int dissolve_free_huge_pages(unsigned long start_pfn,
787 unsigned long end_pfn);
789 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
790 #ifndef arch_hugetlb_migration_supported
791 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
793 if ((huge_page_shift(h) == PMD_SHIFT) ||
794 (huge_page_shift(h) == PUD_SHIFT) ||
795 (huge_page_shift(h) == PGDIR_SHIFT))
802 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
808 static inline bool hugepage_migration_supported(struct hstate *h)
810 return arch_hugetlb_migration_supported(h);
814 * Movability check is different as compared to migration check.
815 * It determines whether or not a huge page should be placed on
816 * movable zone or not. Movability of any huge page should be
817 * required only if huge page size is supported for migration.
818 * There won't be any reason for the huge page to be movable if
819 * it is not migratable to start with. Also the size of the huge
820 * page should be large enough to be placed under a movable zone
821 * and still feasible enough to be migratable. Just the presence
822 * in movable zone does not make the migration feasible.
824 * So even though large huge page sizes like the gigantic ones
825 * are migratable they should not be movable because its not
826 * feasible to migrate them from movable zone.
828 static inline bool hugepage_movable_supported(struct hstate *h)
830 if (!hugepage_migration_supported(h))
833 if (hstate_is_gigantic(h))
838 /* Movability of hugepages depends on migration support. */
839 static inline gfp_t htlb_alloc_mask(struct hstate *h)
841 if (hugepage_movable_supported(h))
842 return GFP_HIGHUSER_MOVABLE;
847 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
849 gfp_t modified_mask = htlb_alloc_mask(h);
851 /* Some callers might want to enforce node */
852 modified_mask |= (gfp_mask & __GFP_THISNODE);
854 modified_mask |= (gfp_mask & __GFP_NOWARN);
856 return modified_mask;
859 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
860 struct mm_struct *mm, pte_t *pte)
862 if (huge_page_size(h) == PMD_SIZE)
863 return pmd_lockptr(mm, (pmd_t *) pte);
864 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
865 return &mm->page_table_lock;
868 #ifndef hugepages_supported
870 * Some platform decide whether they support huge pages at boot
871 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
872 * when there is no such support
874 #define hugepages_supported() (HPAGE_SHIFT != 0)
877 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
879 static inline void hugetlb_count_init(struct mm_struct *mm)
881 atomic_long_set(&mm->hugetlb_usage, 0);
884 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
886 atomic_long_add(l, &mm->hugetlb_usage);
889 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
891 atomic_long_sub(l, &mm->hugetlb_usage);
894 #ifndef set_huge_swap_pte_at
895 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
896 pte_t *ptep, pte_t pte, unsigned long sz)
898 set_huge_pte_at(mm, addr, ptep, pte);
902 #ifndef huge_ptep_modify_prot_start
903 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
904 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
905 unsigned long addr, pte_t *ptep)
907 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
911 #ifndef huge_ptep_modify_prot_commit
912 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
913 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
914 unsigned long addr, pte_t *ptep,
915 pte_t old_pte, pte_t pte)
917 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
921 #else /* CONFIG_HUGETLB_PAGE */
924 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
929 static inline int isolate_or_dissolve_huge_page(struct page *page,
930 struct list_head *list)
935 static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
942 static inline struct page *
943 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
944 nodemask_t *nmask, gfp_t gfp_mask)
949 static inline struct page *alloc_huge_page_vma(struct hstate *h,
950 struct vm_area_struct *vma,
951 unsigned long address)
956 static inline int __alloc_bootmem_huge_page(struct hstate *h)
961 static inline struct hstate *hstate_file(struct file *f)
966 static inline struct hstate *hstate_sizelog(int page_size_log)
971 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
976 static inline struct hstate *page_hstate(struct page *page)
981 static inline struct hstate *size_to_hstate(unsigned long size)
986 static inline unsigned long huge_page_size(struct hstate *h)
991 static inline unsigned long huge_page_mask(struct hstate *h)
996 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
1001 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
1006 static inline unsigned int huge_page_order(struct hstate *h)
1011 static inline unsigned int huge_page_shift(struct hstate *h)
1016 static inline bool hstate_is_gigantic(struct hstate *h)
1021 static inline unsigned int pages_per_huge_page(struct hstate *h)
1026 static inline unsigned hstate_index_to_shift(unsigned index)
1031 static inline int hstate_index(struct hstate *h)
1036 static inline int dissolve_free_huge_page(struct page *page)
1041 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
1042 unsigned long end_pfn)
1047 static inline bool hugepage_migration_supported(struct hstate *h)
1052 static inline bool hugepage_movable_supported(struct hstate *h)
1057 static inline gfp_t htlb_alloc_mask(struct hstate *h)
1062 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
1067 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
1068 struct mm_struct *mm, pte_t *pte)
1070 return &mm->page_table_lock;
1073 static inline void hugetlb_count_init(struct mm_struct *mm)
1077 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
1081 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
1085 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
1086 pte_t *ptep, pte_t pte, unsigned long sz)
1089 #endif /* CONFIG_HUGETLB_PAGE */
1091 static inline spinlock_t *huge_pte_lock(struct hstate *h,
1092 struct mm_struct *mm, pte_t *pte)
1096 ptl = huge_pte_lockptr(h, mm, pte);
1101 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
1102 extern void __init hugetlb_cma_reserve(int order);
1103 extern void __init hugetlb_cma_check(void);
1105 static inline __init void hugetlb_cma_reserve(int order)
1108 static inline __init void hugetlb_cma_check(void)
1113 bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);
1115 #ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
1117 * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
1120 #define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
1123 #endif /* _LINUX_HUGETLB_H */