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 int hugetlb_sysctl_handler(struct ctl_table *, int, void *, size_t *, loff_t *);
128 int hugetlb_overcommit_handler(struct ctl_table *, int, void *, size_t *,
130 int hugetlb_treat_movable_handler(struct ctl_table *, int, void *, size_t *,
132 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, void *, size_t *,
135 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
136 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
137 struct page **, struct vm_area_struct **,
138 unsigned long *, unsigned long *, long, unsigned int,
140 void unmap_hugepage_range(struct vm_area_struct *,
141 unsigned long, unsigned long, struct page *);
142 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
143 struct vm_area_struct *vma,
144 unsigned long start, unsigned long end,
145 struct page *ref_page);
146 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
147 unsigned long start, unsigned long end,
148 struct page *ref_page);
149 void hugetlb_report_meminfo(struct seq_file *);
150 int hugetlb_report_node_meminfo(char *buf, int len, int nid);
151 void hugetlb_show_meminfo(void);
152 unsigned long hugetlb_total_pages(void);
153 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
154 unsigned long address, unsigned int flags);
155 #ifdef CONFIG_USERFAULTFD
156 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
157 struct vm_area_struct *dst_vma,
158 unsigned long dst_addr,
159 unsigned long src_addr,
160 enum mcopy_atomic_mode mode,
161 struct page **pagep);
162 #endif /* CONFIG_USERFAULTFD */
163 bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
164 struct vm_area_struct *vma,
165 vm_flags_t vm_flags);
166 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
168 bool isolate_huge_page(struct page *page, struct list_head *list);
169 int get_hwpoison_huge_page(struct page *page, bool *hugetlb);
170 int get_huge_page_for_hwpoison(unsigned long pfn, int flags);
171 void putback_active_hugepage(struct page *page);
172 void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
173 void free_huge_page(struct page *page);
174 void hugetlb_fix_reserve_counts(struct inode *inode);
175 extern struct mutex *hugetlb_fault_mutex_table;
176 u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
178 pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
179 unsigned long addr, pud_t *pud);
181 struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
183 extern int sysctl_hugetlb_shm_group;
184 extern struct list_head huge_boot_pages;
188 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
189 unsigned long addr, unsigned long sz);
190 pte_t *huge_pte_offset(struct mm_struct *mm,
191 unsigned long addr, unsigned long sz);
192 int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
193 unsigned long *addr, pte_t *ptep);
194 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
195 unsigned long *start, unsigned long *end);
196 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
198 struct page *follow_huge_pd(struct vm_area_struct *vma,
199 unsigned long address, hugepd_t hpd,
200 int flags, int pdshift);
201 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
202 pmd_t *pmd, int flags);
203 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
204 pud_t *pud, int flags);
205 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
206 pgd_t *pgd, int flags);
208 int pmd_huge(pmd_t pmd);
209 int pud_huge(pud_t pud);
210 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
211 unsigned long address, unsigned long end, pgprot_t newprot);
213 bool is_hugetlb_entry_migration(pte_t pte);
214 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
216 #else /* !CONFIG_HUGETLB_PAGE */
218 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
222 static inline unsigned long hugetlb_total_pages(void)
227 static inline struct address_space *hugetlb_page_mapping_lock_write(
233 static inline int huge_pmd_unshare(struct mm_struct *mm,
234 struct vm_area_struct *vma,
235 unsigned long *addr, pte_t *ptep)
240 static inline void adjust_range_if_pmd_sharing_possible(
241 struct vm_area_struct *vma,
242 unsigned long *start, unsigned long *end)
246 static inline long follow_hugetlb_page(struct mm_struct *mm,
247 struct vm_area_struct *vma, struct page **pages,
248 struct vm_area_struct **vmas, unsigned long *position,
249 unsigned long *nr_pages, long i, unsigned int flags,
256 static inline struct page *follow_huge_addr(struct mm_struct *mm,
257 unsigned long address, int write)
259 return ERR_PTR(-EINVAL);
262 static inline int copy_hugetlb_page_range(struct mm_struct *dst,
263 struct mm_struct *src, struct vm_area_struct *vma)
269 static inline void hugetlb_report_meminfo(struct seq_file *m)
273 static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
278 static inline void hugetlb_show_meminfo(void)
282 static inline struct page *follow_huge_pd(struct vm_area_struct *vma,
283 unsigned long address, hugepd_t hpd, int flags,
289 static inline struct page *follow_huge_pmd(struct mm_struct *mm,
290 unsigned long address, pmd_t *pmd, int flags)
295 static inline struct page *follow_huge_pud(struct mm_struct *mm,
296 unsigned long address, pud_t *pud, int flags)
301 static inline struct page *follow_huge_pgd(struct mm_struct *mm,
302 unsigned long address, pgd_t *pgd, int flags)
307 static inline int prepare_hugepage_range(struct file *file,
308 unsigned long addr, unsigned long len)
313 static inline int pmd_huge(pmd_t pmd)
318 static inline int pud_huge(pud_t pud)
323 static inline int is_hugepage_only_range(struct mm_struct *mm,
324 unsigned long addr, unsigned long len)
329 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
330 unsigned long addr, unsigned long end,
331 unsigned long floor, unsigned long ceiling)
336 #ifdef CONFIG_USERFAULTFD
337 static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
339 struct vm_area_struct *dst_vma,
340 unsigned long dst_addr,
341 unsigned long src_addr,
342 enum mcopy_atomic_mode mode,
348 #endif /* CONFIG_USERFAULTFD */
350 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
356 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
361 static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
366 static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags)
371 static inline void putback_active_hugepage(struct page *page)
375 static inline void move_hugetlb_state(struct page *oldpage,
376 struct page *newpage, int reason)
380 static inline unsigned long hugetlb_change_protection(
381 struct vm_area_struct *vma, unsigned long address,
382 unsigned long end, pgprot_t newprot)
387 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
388 struct vm_area_struct *vma, unsigned long start,
389 unsigned long end, struct page *ref_page)
394 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
395 struct vm_area_struct *vma, unsigned long start,
396 unsigned long end, struct page *ref_page)
401 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
402 struct vm_area_struct *vma, unsigned long address,
409 static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }
411 #endif /* !CONFIG_HUGETLB_PAGE */
413 * hugepages at page global directory. If arch support
414 * hugepages at pgd level, they need to define this.
417 #define pgd_huge(x) 0
420 #define p4d_huge(x) 0
424 static inline int pgd_write(pgd_t pgd)
431 #define HUGETLB_ANON_FILE "anon_hugepage"
435 * The file will be used as an shm file so shmfs accounting rules
438 HUGETLB_SHMFS_INODE = 1,
440 * The file is being created on the internal vfs mount and shmfs
441 * accounting rules do not apply
443 HUGETLB_ANONHUGE_INODE = 2,
446 #ifdef CONFIG_HUGETLBFS
447 struct hugetlbfs_sb_info {
448 long max_inodes; /* inodes allowed */
449 long free_inodes; /* inodes free */
450 spinlock_t stat_lock;
451 struct hstate *hstate;
452 struct hugepage_subpool *spool;
458 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
460 return sb->s_fs_info;
463 struct hugetlbfs_inode_info {
464 struct shared_policy policy;
465 struct inode vfs_inode;
469 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
471 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
474 extern const struct file_operations hugetlbfs_file_operations;
475 extern const struct vm_operations_struct hugetlb_vm_ops;
476 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
477 struct ucounts **ucounts, int creat_flags,
480 static inline bool is_file_hugepages(struct file *file)
482 if (file->f_op == &hugetlbfs_file_operations)
485 return is_file_shm_hugepages(file);
488 static inline struct hstate *hstate_inode(struct inode *i)
490 return HUGETLBFS_SB(i->i_sb)->hstate;
492 #else /* !CONFIG_HUGETLBFS */
494 #define is_file_hugepages(file) false
495 static inline struct file *
496 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
497 struct ucounts **ucounts, int creat_flags,
500 return ERR_PTR(-ENOSYS);
503 static inline struct hstate *hstate_inode(struct inode *i)
507 #endif /* !CONFIG_HUGETLBFS */
509 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
510 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
511 unsigned long len, unsigned long pgoff,
512 unsigned long flags);
513 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
516 * huegtlb page specific state flags. These flags are located in page.private
517 * of the hugetlb head page. Functions created via the below macros should be
518 * used to manipulate these flags.
520 * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
521 * allocation time. Cleared when page is fully instantiated. Free
522 * routine checks flag to restore a reservation on error paths.
523 * Synchronization: Examined or modified by code that knows it has
524 * the only reference to page. i.e. After allocation but before use
525 * or when the page is being freed.
526 * HPG_migratable - Set after a newly allocated page is added to the page
527 * cache and/or page tables. Indicates the page is a candidate for
529 * Synchronization: Initially set after new page allocation with no
530 * locking. When examined and modified during migration processing
531 * (isolate, migrate, putback) the hugetlb_lock is held.
532 * HPG_temporary - - Set on a page that is temporarily allocated from the buddy
533 * allocator. Typically used for migration target pages when no pages
534 * are available in the pool. The hugetlb free page path will
535 * immediately free pages with this flag set to the buddy allocator.
536 * Synchronization: Can be set after huge page allocation from buddy when
537 * code knows it has only reference. All other examinations and
538 * modifications require hugetlb_lock.
539 * HPG_freed - Set when page is on the free lists.
540 * Synchronization: hugetlb_lock held for examination and modification.
541 * HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed.
543 enum hugetlb_page_flags {
544 HPG_restore_reserve = 0,
548 HPG_vmemmap_optimized,
553 * Macros to create test, set and clear function definitions for
554 * hugetlb specific page flags.
556 #ifdef CONFIG_HUGETLB_PAGE
557 #define TESTHPAGEFLAG(uname, flname) \
558 static inline int HPage##uname(struct page *page) \
559 { return test_bit(HPG_##flname, &(page->private)); }
561 #define SETHPAGEFLAG(uname, flname) \
562 static inline void SetHPage##uname(struct page *page) \
563 { set_bit(HPG_##flname, &(page->private)); }
565 #define CLEARHPAGEFLAG(uname, flname) \
566 static inline void ClearHPage##uname(struct page *page) \
567 { clear_bit(HPG_##flname, &(page->private)); }
569 #define TESTHPAGEFLAG(uname, flname) \
570 static inline int HPage##uname(struct page *page) \
573 #define SETHPAGEFLAG(uname, flname) \
574 static inline void SetHPage##uname(struct page *page) \
577 #define CLEARHPAGEFLAG(uname, flname) \
578 static inline void ClearHPage##uname(struct page *page) \
582 #define HPAGEFLAG(uname, flname) \
583 TESTHPAGEFLAG(uname, flname) \
584 SETHPAGEFLAG(uname, flname) \
585 CLEARHPAGEFLAG(uname, flname) \
588 * Create functions associated with hugetlb page flags
590 HPAGEFLAG(RestoreReserve, restore_reserve)
591 HPAGEFLAG(Migratable, migratable)
592 HPAGEFLAG(Temporary, temporary)
593 HPAGEFLAG(Freed, freed)
594 HPAGEFLAG(VmemmapOptimized, vmemmap_optimized)
596 #ifdef CONFIG_HUGETLB_PAGE
598 #define HSTATE_NAME_LEN 32
599 /* Defines one hugetlb page size */
601 struct mutex resize_lock;
602 int next_nid_to_alloc;
603 int next_nid_to_free;
606 unsigned long max_huge_pages;
607 unsigned long nr_huge_pages;
608 unsigned long free_huge_pages;
609 unsigned long resv_huge_pages;
610 unsigned long surplus_huge_pages;
611 unsigned long nr_overcommit_huge_pages;
612 struct list_head hugepage_activelist;
613 struct list_head hugepage_freelists[MAX_NUMNODES];
614 unsigned int nr_huge_pages_node[MAX_NUMNODES];
615 unsigned int free_huge_pages_node[MAX_NUMNODES];
616 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
617 #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
618 unsigned int nr_free_vmemmap_pages;
620 #ifdef CONFIG_CGROUP_HUGETLB
621 /* cgroup control files */
622 struct cftype cgroup_files_dfl[7];
623 struct cftype cgroup_files_legacy[9];
625 char name[HSTATE_NAME_LEN];
628 struct huge_bootmem_page {
629 struct list_head list;
630 struct hstate *hstate;
633 int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
634 struct page *alloc_huge_page(struct vm_area_struct *vma,
635 unsigned long addr, int avoid_reserve);
636 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
637 nodemask_t *nmask, gfp_t gfp_mask);
638 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
639 unsigned long address);
640 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
642 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
643 unsigned long address, struct page *page);
646 int __init __alloc_bootmem_huge_page(struct hstate *h);
647 int __init alloc_bootmem_huge_page(struct hstate *h);
649 void __init hugetlb_add_hstate(unsigned order);
650 bool __init arch_hugetlb_valid_size(unsigned long size);
651 struct hstate *size_to_hstate(unsigned long size);
653 #ifndef HUGE_MAX_HSTATE
654 #define HUGE_MAX_HSTATE 1
657 extern struct hstate hstates[HUGE_MAX_HSTATE];
658 extern unsigned int default_hstate_idx;
660 #define default_hstate (hstates[default_hstate_idx])
663 * hugetlb page subpool pointer located in hpage[1].private
665 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
667 return (void *)page_private(hpage + SUBPAGE_INDEX_SUBPOOL);
670 static inline void hugetlb_set_page_subpool(struct page *hpage,
671 struct hugepage_subpool *subpool)
673 set_page_private(hpage + SUBPAGE_INDEX_SUBPOOL, (unsigned long)subpool);
676 static inline struct hstate *hstate_file(struct file *f)
678 return hstate_inode(file_inode(f));
681 static inline struct hstate *hstate_sizelog(int page_size_log)
684 return &default_hstate;
686 return size_to_hstate(1UL << page_size_log);
689 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
691 return hstate_file(vma->vm_file);
694 static inline unsigned long huge_page_size(struct hstate *h)
696 return (unsigned long)PAGE_SIZE << h->order;
699 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
701 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
703 static inline unsigned long huge_page_mask(struct hstate *h)
708 static inline unsigned int huge_page_order(struct hstate *h)
713 static inline unsigned huge_page_shift(struct hstate *h)
715 return h->order + PAGE_SHIFT;
718 static inline bool hstate_is_gigantic(struct hstate *h)
720 return huge_page_order(h) >= MAX_ORDER;
723 static inline unsigned int pages_per_huge_page(struct hstate *h)
725 return 1 << h->order;
728 static inline unsigned int blocks_per_huge_page(struct hstate *h)
730 return huge_page_size(h) / 512;
733 #include <asm/hugetlb.h>
735 #ifndef is_hugepage_only_range
736 static inline int is_hugepage_only_range(struct mm_struct *mm,
737 unsigned long addr, unsigned long len)
741 #define is_hugepage_only_range is_hugepage_only_range
744 #ifndef arch_clear_hugepage_flags
745 static inline void arch_clear_hugepage_flags(struct page *page) { }
746 #define arch_clear_hugepage_flags arch_clear_hugepage_flags
749 #ifndef arch_make_huge_pte
750 static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
757 static inline struct hstate *page_hstate(struct page *page)
759 VM_BUG_ON_PAGE(!PageHuge(page), page);
760 return size_to_hstate(page_size(page));
763 static inline unsigned hstate_index_to_shift(unsigned index)
765 return hstates[index].order + PAGE_SHIFT;
768 static inline int hstate_index(struct hstate *h)
773 extern int dissolve_free_huge_page(struct page *page);
774 extern int dissolve_free_huge_pages(unsigned long start_pfn,
775 unsigned long end_pfn);
777 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
778 #ifndef arch_hugetlb_migration_supported
779 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
781 if ((huge_page_shift(h) == PMD_SHIFT) ||
782 (huge_page_shift(h) == PUD_SHIFT) ||
783 (huge_page_shift(h) == PGDIR_SHIFT))
790 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
796 static inline bool hugepage_migration_supported(struct hstate *h)
798 return arch_hugetlb_migration_supported(h);
802 * Movability check is different as compared to migration check.
803 * It determines whether or not a huge page should be placed on
804 * movable zone or not. Movability of any huge page should be
805 * required only if huge page size is supported for migration.
806 * There won't be any reason for the huge page to be movable if
807 * it is not migratable to start with. Also the size of the huge
808 * page should be large enough to be placed under a movable zone
809 * and still feasible enough to be migratable. Just the presence
810 * in movable zone does not make the migration feasible.
812 * So even though large huge page sizes like the gigantic ones
813 * are migratable they should not be movable because its not
814 * feasible to migrate them from movable zone.
816 static inline bool hugepage_movable_supported(struct hstate *h)
818 if (!hugepage_migration_supported(h))
821 if (hstate_is_gigantic(h))
826 /* Movability of hugepages depends on migration support. */
827 static inline gfp_t htlb_alloc_mask(struct hstate *h)
829 if (hugepage_movable_supported(h))
830 return GFP_HIGHUSER_MOVABLE;
835 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
837 gfp_t modified_mask = htlb_alloc_mask(h);
839 /* Some callers might want to enforce node */
840 modified_mask |= (gfp_mask & __GFP_THISNODE);
842 modified_mask |= (gfp_mask & __GFP_NOWARN);
844 return modified_mask;
847 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
848 struct mm_struct *mm, pte_t *pte)
850 if (huge_page_size(h) == PMD_SIZE)
851 return pmd_lockptr(mm, (pmd_t *) pte);
852 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
853 return &mm->page_table_lock;
856 #ifndef hugepages_supported
858 * Some platform decide whether they support huge pages at boot
859 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
860 * when there is no such support
862 #define hugepages_supported() (HPAGE_SHIFT != 0)
865 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
867 static inline void hugetlb_count_init(struct mm_struct *mm)
869 atomic_long_set(&mm->hugetlb_usage, 0);
872 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
874 atomic_long_add(l, &mm->hugetlb_usage);
877 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
879 atomic_long_sub(l, &mm->hugetlb_usage);
882 #ifndef set_huge_swap_pte_at
883 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
884 pte_t *ptep, pte_t pte, unsigned long sz)
886 set_huge_pte_at(mm, addr, ptep, pte);
890 #ifndef huge_ptep_modify_prot_start
891 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
892 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
893 unsigned long addr, pte_t *ptep)
895 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
899 #ifndef huge_ptep_modify_prot_commit
900 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
901 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
902 unsigned long addr, pte_t *ptep,
903 pte_t old_pte, pte_t pte)
905 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
909 #else /* CONFIG_HUGETLB_PAGE */
912 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
917 static inline int isolate_or_dissolve_huge_page(struct page *page,
918 struct list_head *list)
923 static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
930 static inline struct page *
931 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
932 nodemask_t *nmask, gfp_t gfp_mask)
937 static inline struct page *alloc_huge_page_vma(struct hstate *h,
938 struct vm_area_struct *vma,
939 unsigned long address)
944 static inline int __alloc_bootmem_huge_page(struct hstate *h)
949 static inline struct hstate *hstate_file(struct file *f)
954 static inline struct hstate *hstate_sizelog(int page_size_log)
959 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
964 static inline struct hstate *page_hstate(struct page *page)
969 static inline unsigned long huge_page_size(struct hstate *h)
974 static inline unsigned long huge_page_mask(struct hstate *h)
979 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
984 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
989 static inline unsigned int huge_page_order(struct hstate *h)
994 static inline unsigned int huge_page_shift(struct hstate *h)
999 static inline bool hstate_is_gigantic(struct hstate *h)
1004 static inline unsigned int pages_per_huge_page(struct hstate *h)
1009 static inline unsigned hstate_index_to_shift(unsigned index)
1014 static inline int hstate_index(struct hstate *h)
1019 static inline int dissolve_free_huge_page(struct page *page)
1024 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
1025 unsigned long end_pfn)
1030 static inline bool hugepage_migration_supported(struct hstate *h)
1035 static inline bool hugepage_movable_supported(struct hstate *h)
1040 static inline gfp_t htlb_alloc_mask(struct hstate *h)
1045 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
1050 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
1051 struct mm_struct *mm, pte_t *pte)
1053 return &mm->page_table_lock;
1056 static inline void hugetlb_count_init(struct mm_struct *mm)
1060 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
1064 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
1068 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
1069 pte_t *ptep, pte_t pte, unsigned long sz)
1072 #endif /* CONFIG_HUGETLB_PAGE */
1074 #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
1075 extern bool hugetlb_free_vmemmap_enabled;
1077 #define hugetlb_free_vmemmap_enabled false
1080 static inline spinlock_t *huge_pte_lock(struct hstate *h,
1081 struct mm_struct *mm, pte_t *pte)
1085 ptl = huge_pte_lockptr(h, mm, pte);
1090 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
1091 extern void __init hugetlb_cma_reserve(int order);
1092 extern void __init hugetlb_cma_check(void);
1094 static inline __init void hugetlb_cma_reserve(int order)
1097 static inline __init void hugetlb_cma_check(void)
1102 bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);
1104 #ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
1106 * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
1109 #define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
1112 #endif /* _LINUX_HUGETLB_H */