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 void putback_active_hugepage(struct page *page);
173 void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
174 void free_huge_page(struct page *page);
175 void hugetlb_fix_reserve_counts(struct inode *inode);
176 extern struct mutex *hugetlb_fault_mutex_table;
177 u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
179 pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
180 unsigned long addr, pud_t *pud);
182 struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
184 extern int sysctl_hugetlb_shm_group;
185 extern struct list_head huge_boot_pages;
189 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
190 unsigned long addr, unsigned long sz);
191 pte_t *huge_pte_offset(struct mm_struct *mm,
192 unsigned long addr, unsigned long sz);
193 int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
194 unsigned long *addr, pte_t *ptep);
195 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
196 unsigned long *start, unsigned long *end);
197 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
199 struct page *follow_huge_pd(struct vm_area_struct *vma,
200 unsigned long address, hugepd_t hpd,
201 int flags, int pdshift);
202 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
203 pmd_t *pmd, int flags);
204 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
205 pud_t *pud, int flags);
206 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
207 pgd_t *pgd, int flags);
209 int pmd_huge(pmd_t pmd);
210 int pud_huge(pud_t pud);
211 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
212 unsigned long address, unsigned long end, pgprot_t newprot);
214 bool is_hugetlb_entry_migration(pte_t pte);
215 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
217 #else /* !CONFIG_HUGETLB_PAGE */
219 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
223 static inline void clear_vma_resv_huge_pages(struct vm_area_struct *vma)
227 static inline unsigned long hugetlb_total_pages(void)
232 static inline struct address_space *hugetlb_page_mapping_lock_write(
238 static inline int huge_pmd_unshare(struct mm_struct *mm,
239 struct vm_area_struct *vma,
240 unsigned long *addr, pte_t *ptep)
245 static inline void adjust_range_if_pmd_sharing_possible(
246 struct vm_area_struct *vma,
247 unsigned long *start, unsigned long *end)
251 static inline long follow_hugetlb_page(struct mm_struct *mm,
252 struct vm_area_struct *vma, struct page **pages,
253 struct vm_area_struct **vmas, unsigned long *position,
254 unsigned long *nr_pages, long i, unsigned int flags,
261 static inline struct page *follow_huge_addr(struct mm_struct *mm,
262 unsigned long address, int write)
264 return ERR_PTR(-EINVAL);
267 static inline int copy_hugetlb_page_range(struct mm_struct *dst,
268 struct mm_struct *src, struct vm_area_struct *vma)
274 static inline int move_hugetlb_page_tables(struct vm_area_struct *vma,
275 struct vm_area_struct *new_vma,
276 unsigned long old_addr,
277 unsigned long new_addr,
284 static inline void hugetlb_report_meminfo(struct seq_file *m)
288 static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
293 static inline void hugetlb_show_meminfo(void)
297 static inline struct page *follow_huge_pd(struct vm_area_struct *vma,
298 unsigned long address, hugepd_t hpd, int flags,
304 static inline struct page *follow_huge_pmd(struct mm_struct *mm,
305 unsigned long address, pmd_t *pmd, int flags)
310 static inline struct page *follow_huge_pud(struct mm_struct *mm,
311 unsigned long address, pud_t *pud, int flags)
316 static inline struct page *follow_huge_pgd(struct mm_struct *mm,
317 unsigned long address, pgd_t *pgd, int flags)
322 static inline int prepare_hugepage_range(struct file *file,
323 unsigned long addr, unsigned long len)
328 static inline int pmd_huge(pmd_t pmd)
333 static inline int pud_huge(pud_t pud)
338 static inline int is_hugepage_only_range(struct mm_struct *mm,
339 unsigned long addr, unsigned long len)
344 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
345 unsigned long addr, unsigned long end,
346 unsigned long floor, unsigned long ceiling)
351 #ifdef CONFIG_USERFAULTFD
352 static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
354 struct vm_area_struct *dst_vma,
355 unsigned long dst_addr,
356 unsigned long src_addr,
357 enum mcopy_atomic_mode mode,
363 #endif /* CONFIG_USERFAULTFD */
365 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
371 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
376 static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
381 static inline void putback_active_hugepage(struct page *page)
385 static inline void move_hugetlb_state(struct page *oldpage,
386 struct page *newpage, int reason)
390 static inline unsigned long hugetlb_change_protection(
391 struct vm_area_struct *vma, unsigned long address,
392 unsigned long end, pgprot_t newprot)
397 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
398 struct vm_area_struct *vma, unsigned long start,
399 unsigned long end, struct page *ref_page)
404 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
405 struct vm_area_struct *vma, unsigned long address,
412 static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }
414 #endif /* !CONFIG_HUGETLB_PAGE */
416 * hugepages at page global directory. If arch support
417 * hugepages at pgd level, they need to define this.
420 #define pgd_huge(x) 0
423 #define p4d_huge(x) 0
427 static inline int pgd_write(pgd_t pgd)
434 #define HUGETLB_ANON_FILE "anon_hugepage"
438 * The file will be used as an shm file so shmfs accounting rules
441 HUGETLB_SHMFS_INODE = 1,
443 * The file is being created on the internal vfs mount and shmfs
444 * accounting rules do not apply
446 HUGETLB_ANONHUGE_INODE = 2,
449 #ifdef CONFIG_HUGETLBFS
450 struct hugetlbfs_sb_info {
451 long max_inodes; /* inodes allowed */
452 long free_inodes; /* inodes free */
453 spinlock_t stat_lock;
454 struct hstate *hstate;
455 struct hugepage_subpool *spool;
461 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
463 return sb->s_fs_info;
466 struct hugetlbfs_inode_info {
467 struct shared_policy policy;
468 struct inode vfs_inode;
472 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
474 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
477 extern const struct file_operations hugetlbfs_file_operations;
478 extern const struct vm_operations_struct hugetlb_vm_ops;
479 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
480 int creat_flags, int page_size_log);
482 static inline bool is_file_hugepages(struct file *file)
484 if (file->f_op == &hugetlbfs_file_operations)
487 return is_file_shm_hugepages(file);
490 static inline struct hstate *hstate_inode(struct inode *i)
492 return HUGETLBFS_SB(i->i_sb)->hstate;
494 #else /* !CONFIG_HUGETLBFS */
496 #define is_file_hugepages(file) false
497 static inline struct file *
498 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
499 int creat_flags, int page_size_log)
501 return ERR_PTR(-ENOSYS);
504 static inline struct hstate *hstate_inode(struct inode *i)
508 #endif /* !CONFIG_HUGETLBFS */
510 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
511 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
512 unsigned long len, unsigned long pgoff,
513 unsigned long flags);
514 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
517 * huegtlb page specific state flags. These flags are located in page.private
518 * of the hugetlb head page. Functions created via the below macros should be
519 * used to manipulate these flags.
521 * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
522 * allocation time. Cleared when page is fully instantiated. Free
523 * routine checks flag to restore a reservation on error paths.
524 * Synchronization: Examined or modified by code that knows it has
525 * the only reference to page. i.e. After allocation but before use
526 * or when the page is being freed.
527 * HPG_migratable - Set after a newly allocated page is added to the page
528 * cache and/or page tables. Indicates the page is a candidate for
530 * Synchronization: Initially set after new page allocation with no
531 * locking. When examined and modified during migration processing
532 * (isolate, migrate, putback) the hugetlb_lock is held.
533 * HPG_temporary - - Set on a page that is temporarily allocated from the buddy
534 * allocator. Typically used for migration target pages when no pages
535 * are available in the pool. The hugetlb free page path will
536 * immediately free pages with this flag set to the buddy allocator.
537 * Synchronization: Can be set after huge page allocation from buddy when
538 * code knows it has only reference. All other examinations and
539 * modifications require hugetlb_lock.
540 * HPG_freed - Set when page is on the free lists.
541 * Synchronization: hugetlb_lock held for examination and modification.
542 * HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed.
544 enum hugetlb_page_flags {
545 HPG_restore_reserve = 0,
549 HPG_vmemmap_optimized,
554 * Macros to create test, set and clear function definitions for
555 * hugetlb specific page flags.
557 #ifdef CONFIG_HUGETLB_PAGE
558 #define TESTHPAGEFLAG(uname, flname) \
559 static inline int HPage##uname(struct page *page) \
560 { return test_bit(HPG_##flname, &(page->private)); }
562 #define SETHPAGEFLAG(uname, flname) \
563 static inline void SetHPage##uname(struct page *page) \
564 { set_bit(HPG_##flname, &(page->private)); }
566 #define CLEARHPAGEFLAG(uname, flname) \
567 static inline void ClearHPage##uname(struct page *page) \
568 { clear_bit(HPG_##flname, &(page->private)); }
570 #define TESTHPAGEFLAG(uname, flname) \
571 static inline int HPage##uname(struct page *page) \
574 #define SETHPAGEFLAG(uname, flname) \
575 static inline void SetHPage##uname(struct page *page) \
578 #define CLEARHPAGEFLAG(uname, flname) \
579 static inline void ClearHPage##uname(struct page *page) \
583 #define HPAGEFLAG(uname, flname) \
584 TESTHPAGEFLAG(uname, flname) \
585 SETHPAGEFLAG(uname, flname) \
586 CLEARHPAGEFLAG(uname, flname) \
589 * Create functions associated with hugetlb page flags
591 HPAGEFLAG(RestoreReserve, restore_reserve)
592 HPAGEFLAG(Migratable, migratable)
593 HPAGEFLAG(Temporary, temporary)
594 HPAGEFLAG(Freed, freed)
595 HPAGEFLAG(VmemmapOptimized, vmemmap_optimized)
597 #ifdef CONFIG_HUGETLB_PAGE
599 #define HSTATE_NAME_LEN 32
600 /* Defines one hugetlb page size */
602 struct mutex resize_lock;
603 int next_nid_to_alloc;
604 int next_nid_to_free;
606 unsigned int demote_order;
608 unsigned long max_huge_pages;
609 unsigned long nr_huge_pages;
610 unsigned long free_huge_pages;
611 unsigned long resv_huge_pages;
612 unsigned long surplus_huge_pages;
613 unsigned long nr_overcommit_huge_pages;
614 struct list_head hugepage_activelist;
615 struct list_head hugepage_freelists[MAX_NUMNODES];
616 unsigned int max_huge_pages_node[MAX_NUMNODES];
617 unsigned int nr_huge_pages_node[MAX_NUMNODES];
618 unsigned int free_huge_pages_node[MAX_NUMNODES];
619 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
620 #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
621 unsigned int nr_free_vmemmap_pages;
623 #ifdef CONFIG_CGROUP_HUGETLB
624 /* cgroup control files */
625 struct cftype cgroup_files_dfl[8];
626 struct cftype cgroup_files_legacy[10];
628 char name[HSTATE_NAME_LEN];
631 struct huge_bootmem_page {
632 struct list_head list;
633 struct hstate *hstate;
636 int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
637 struct page *alloc_huge_page(struct vm_area_struct *vma,
638 unsigned long addr, int avoid_reserve);
639 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
640 nodemask_t *nmask, gfp_t gfp_mask);
641 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
642 unsigned long address);
643 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
645 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
646 unsigned long address, struct page *page);
649 int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);
650 int __init alloc_bootmem_huge_page(struct hstate *h, int nid);
651 bool __init hugetlb_node_alloc_supported(void);
653 void __init hugetlb_add_hstate(unsigned order);
654 bool __init arch_hugetlb_valid_size(unsigned long size);
655 struct hstate *size_to_hstate(unsigned long size);
657 #ifndef HUGE_MAX_HSTATE
658 #define HUGE_MAX_HSTATE 1
661 extern struct hstate hstates[HUGE_MAX_HSTATE];
662 extern unsigned int default_hstate_idx;
664 #define default_hstate (hstates[default_hstate_idx])
667 * hugetlb page subpool pointer located in hpage[1].private
669 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
671 return (void *)page_private(hpage + SUBPAGE_INDEX_SUBPOOL);
674 static inline void hugetlb_set_page_subpool(struct page *hpage,
675 struct hugepage_subpool *subpool)
677 set_page_private(hpage + SUBPAGE_INDEX_SUBPOOL, (unsigned long)subpool);
680 static inline struct hstate *hstate_file(struct file *f)
682 return hstate_inode(file_inode(f));
685 static inline struct hstate *hstate_sizelog(int page_size_log)
688 return &default_hstate;
690 return size_to_hstate(1UL << page_size_log);
693 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
695 return hstate_file(vma->vm_file);
698 static inline unsigned long huge_page_size(struct hstate *h)
700 return (unsigned long)PAGE_SIZE << h->order;
703 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
705 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
707 static inline unsigned long huge_page_mask(struct hstate *h)
712 static inline unsigned int huge_page_order(struct hstate *h)
717 static inline unsigned huge_page_shift(struct hstate *h)
719 return h->order + PAGE_SHIFT;
722 static inline bool hstate_is_gigantic(struct hstate *h)
724 return huge_page_order(h) >= MAX_ORDER;
727 static inline unsigned int pages_per_huge_page(struct hstate *h)
729 return 1 << h->order;
732 static inline unsigned int blocks_per_huge_page(struct hstate *h)
734 return huge_page_size(h) / 512;
737 #include <asm/hugetlb.h>
739 #ifndef is_hugepage_only_range
740 static inline int is_hugepage_only_range(struct mm_struct *mm,
741 unsigned long addr, unsigned long len)
745 #define is_hugepage_only_range is_hugepage_only_range
748 #ifndef arch_clear_hugepage_flags
749 static inline void arch_clear_hugepage_flags(struct page *page) { }
750 #define arch_clear_hugepage_flags arch_clear_hugepage_flags
753 #ifndef arch_make_huge_pte
754 static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
761 static inline struct hstate *page_hstate(struct page *page)
763 VM_BUG_ON_PAGE(!PageHuge(page), page);
764 return size_to_hstate(page_size(page));
767 static inline unsigned hstate_index_to_shift(unsigned index)
769 return hstates[index].order + PAGE_SHIFT;
772 static inline int hstate_index(struct hstate *h)
777 extern int dissolve_free_huge_page(struct page *page);
778 extern int dissolve_free_huge_pages(unsigned long start_pfn,
779 unsigned long end_pfn);
781 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
782 #ifndef arch_hugetlb_migration_supported
783 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
785 if ((huge_page_shift(h) == PMD_SHIFT) ||
786 (huge_page_shift(h) == PUD_SHIFT) ||
787 (huge_page_shift(h) == PGDIR_SHIFT))
794 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
800 static inline bool hugepage_migration_supported(struct hstate *h)
802 return arch_hugetlb_migration_supported(h);
806 * Movability check is different as compared to migration check.
807 * It determines whether or not a huge page should be placed on
808 * movable zone or not. Movability of any huge page should be
809 * required only if huge page size is supported for migration.
810 * There won't be any reason for the huge page to be movable if
811 * it is not migratable to start with. Also the size of the huge
812 * page should be large enough to be placed under a movable zone
813 * and still feasible enough to be migratable. Just the presence
814 * in movable zone does not make the migration feasible.
816 * So even though large huge page sizes like the gigantic ones
817 * are migratable they should not be movable because its not
818 * feasible to migrate them from movable zone.
820 static inline bool hugepage_movable_supported(struct hstate *h)
822 if (!hugepage_migration_supported(h))
825 if (hstate_is_gigantic(h))
830 /* Movability of hugepages depends on migration support. */
831 static inline gfp_t htlb_alloc_mask(struct hstate *h)
833 if (hugepage_movable_supported(h))
834 return GFP_HIGHUSER_MOVABLE;
839 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
841 gfp_t modified_mask = htlb_alloc_mask(h);
843 /* Some callers might want to enforce node */
844 modified_mask |= (gfp_mask & __GFP_THISNODE);
846 modified_mask |= (gfp_mask & __GFP_NOWARN);
848 return modified_mask;
851 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
852 struct mm_struct *mm, pte_t *pte)
854 if (huge_page_size(h) == PMD_SIZE)
855 return pmd_lockptr(mm, (pmd_t *) pte);
856 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
857 return &mm->page_table_lock;
860 #ifndef hugepages_supported
862 * Some platform decide whether they support huge pages at boot
863 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
864 * when there is no such support
866 #define hugepages_supported() (HPAGE_SHIFT != 0)
869 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
871 static inline void hugetlb_count_init(struct mm_struct *mm)
873 atomic_long_set(&mm->hugetlb_usage, 0);
876 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
878 atomic_long_add(l, &mm->hugetlb_usage);
881 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
883 atomic_long_sub(l, &mm->hugetlb_usage);
886 #ifndef set_huge_swap_pte_at
887 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
888 pte_t *ptep, pte_t pte, unsigned long sz)
890 set_huge_pte_at(mm, addr, ptep, pte);
894 #ifndef huge_ptep_modify_prot_start
895 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
896 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
897 unsigned long addr, pte_t *ptep)
899 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
903 #ifndef huge_ptep_modify_prot_commit
904 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
905 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
906 unsigned long addr, pte_t *ptep,
907 pte_t old_pte, pte_t pte)
909 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
913 #else /* CONFIG_HUGETLB_PAGE */
916 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
921 static inline int isolate_or_dissolve_huge_page(struct page *page,
922 struct list_head *list)
927 static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
934 static inline struct page *
935 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
936 nodemask_t *nmask, gfp_t gfp_mask)
941 static inline struct page *alloc_huge_page_vma(struct hstate *h,
942 struct vm_area_struct *vma,
943 unsigned long address)
948 static inline int __alloc_bootmem_huge_page(struct hstate *h)
953 static inline struct hstate *hstate_file(struct file *f)
958 static inline struct hstate *hstate_sizelog(int page_size_log)
963 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
968 static inline struct hstate *page_hstate(struct page *page)
973 static inline unsigned long huge_page_size(struct hstate *h)
978 static inline unsigned long huge_page_mask(struct hstate *h)
983 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
988 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
993 static inline unsigned int huge_page_order(struct hstate *h)
998 static inline unsigned int huge_page_shift(struct hstate *h)
1003 static inline bool hstate_is_gigantic(struct hstate *h)
1008 static inline unsigned int pages_per_huge_page(struct hstate *h)
1013 static inline unsigned hstate_index_to_shift(unsigned index)
1018 static inline int hstate_index(struct hstate *h)
1023 static inline int dissolve_free_huge_page(struct page *page)
1028 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
1029 unsigned long end_pfn)
1034 static inline bool hugepage_migration_supported(struct hstate *h)
1039 static inline bool hugepage_movable_supported(struct hstate *h)
1044 static inline gfp_t htlb_alloc_mask(struct hstate *h)
1049 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
1054 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
1055 struct mm_struct *mm, pte_t *pte)
1057 return &mm->page_table_lock;
1060 static inline void hugetlb_count_init(struct mm_struct *mm)
1064 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
1068 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
1072 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
1073 pte_t *ptep, pte_t pte, unsigned long sz)
1076 #endif /* CONFIG_HUGETLB_PAGE */
1078 #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
1079 extern bool hugetlb_free_vmemmap_enabled;
1081 #define hugetlb_free_vmemmap_enabled false
1084 static inline spinlock_t *huge_pte_lock(struct hstate *h,
1085 struct mm_struct *mm, pte_t *pte)
1089 ptl = huge_pte_lockptr(h, mm, pte);
1094 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
1095 extern void __init hugetlb_cma_reserve(int order);
1096 extern void __init hugetlb_cma_check(void);
1098 static inline __init void hugetlb_cma_reserve(int order)
1101 static inline __init void hugetlb_cma_check(void)
1106 bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);
1108 #ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
1110 * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
1113 #define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
1116 #endif /* _LINUX_HUGETLB_H */