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 <asm/pgtable.h>
19 typedef struct { unsigned long pd; } hugepd_t;
20 #define is_hugepd(hugepd) (0)
21 #define __hugepd(x) ((hugepd_t) { (x) })
24 #ifdef CONFIG_HUGETLB_PAGE
26 #include <linux/mempolicy.h>
27 #include <linux/shm.h>
28 #include <asm/tlbflush.h>
30 struct hugepage_subpool {
33 long max_hpages; /* Maximum huge pages or -1 if no maximum. */
34 long used_hpages; /* Used count against maximum, includes */
35 /* both alloced and reserved pages. */
36 struct hstate *hstate;
37 long min_hpages; /* Minimum huge pages or -1 if no minimum. */
38 long rsv_hpages; /* Pages reserved against global pool to */
39 /* sasitfy minimum size. */
45 struct list_head regions;
46 long adds_in_progress;
47 struct list_head region_cache;
48 long region_cache_count;
50 extern struct resv_map *resv_map_alloc(void);
51 void resv_map_release(struct kref *ref);
53 extern spinlock_t hugetlb_lock;
54 extern int hugetlb_max_hstate __read_mostly;
55 #define for_each_hstate(h) \
56 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
58 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
60 void hugepage_put_subpool(struct hugepage_subpool *spool);
62 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
63 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
64 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
65 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
68 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
69 void __user *, size_t *, loff_t *);
72 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
73 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
74 struct page **, struct vm_area_struct **,
75 unsigned long *, unsigned long *, long, unsigned int,
77 void unmap_hugepage_range(struct vm_area_struct *,
78 unsigned long, unsigned long, struct page *);
79 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
80 struct vm_area_struct *vma,
81 unsigned long start, unsigned long end,
82 struct page *ref_page);
83 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
84 unsigned long start, unsigned long end,
85 struct page *ref_page);
86 void hugetlb_report_meminfo(struct seq_file *);
87 int hugetlb_report_node_meminfo(int, char *);
88 void hugetlb_show_meminfo(void);
89 unsigned long hugetlb_total_pages(void);
90 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
91 unsigned long address, unsigned int flags);
92 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
93 struct vm_area_struct *dst_vma,
94 unsigned long dst_addr,
95 unsigned long src_addr,
97 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
98 struct vm_area_struct *vma,
100 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
102 bool isolate_huge_page(struct page *page, struct list_head *list);
103 void putback_active_hugepage(struct page *page);
104 void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
105 void free_huge_page(struct page *page);
106 void hugetlb_fix_reserve_counts(struct inode *inode);
107 extern struct mutex *hugetlb_fault_mutex_table;
108 u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
111 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
113 extern int sysctl_hugetlb_shm_group;
114 extern struct list_head huge_boot_pages;
118 pte_t *huge_pte_alloc(struct mm_struct *mm,
119 unsigned long addr, unsigned long sz);
120 pte_t *huge_pte_offset(struct mm_struct *mm,
121 unsigned long addr, unsigned long sz);
122 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
123 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
124 unsigned long *start, unsigned long *end);
125 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
127 struct page *follow_huge_pd(struct vm_area_struct *vma,
128 unsigned long address, hugepd_t hpd,
129 int flags, int pdshift);
130 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
131 pmd_t *pmd, int flags);
132 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
133 pud_t *pud, int flags);
134 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
135 pgd_t *pgd, int flags);
137 int pmd_huge(pmd_t pmd);
138 int pud_huge(pud_t pud);
139 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
140 unsigned long address, unsigned long end, pgprot_t newprot);
142 bool is_hugetlb_entry_migration(pte_t pte);
144 #else /* !CONFIG_HUGETLB_PAGE */
146 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
150 static inline unsigned long hugetlb_total_pages(void)
155 static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
161 static inline void adjust_range_if_pmd_sharing_possible(
162 struct vm_area_struct *vma,
163 unsigned long *start, unsigned long *end)
167 static inline long follow_hugetlb_page(struct mm_struct *mm,
168 struct vm_area_struct *vma, struct page **pages,
169 struct vm_area_struct **vmas, unsigned long *position,
170 unsigned long *nr_pages, long i, unsigned int flags,
177 static inline struct page *follow_huge_addr(struct mm_struct *mm,
178 unsigned long address, int write)
180 return ERR_PTR(-EINVAL);
183 static inline int copy_hugetlb_page_range(struct mm_struct *dst,
184 struct mm_struct *src, struct vm_area_struct *vma)
190 static inline void hugetlb_report_meminfo(struct seq_file *m)
194 static inline int hugetlb_report_node_meminfo(int nid, char *buf)
199 static inline void hugetlb_show_meminfo(void)
203 static inline struct page *follow_huge_pd(struct vm_area_struct *vma,
204 unsigned long address, hugepd_t hpd, int flags,
210 static inline struct page *follow_huge_pmd(struct mm_struct *mm,
211 unsigned long address, pmd_t *pmd, int flags)
216 static inline struct page *follow_huge_pud(struct mm_struct *mm,
217 unsigned long address, pud_t *pud, int flags)
222 static inline struct page *follow_huge_pgd(struct mm_struct *mm,
223 unsigned long address, pgd_t *pgd, int flags)
228 static inline int prepare_hugepage_range(struct file *file,
229 unsigned long addr, unsigned long len)
234 static inline int pmd_huge(pmd_t pmd)
239 static inline int pud_huge(pud_t pud)
244 static inline int is_hugepage_only_range(struct mm_struct *mm,
245 unsigned long addr, unsigned long len)
250 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
251 unsigned long addr, unsigned long end,
252 unsigned long floor, unsigned long ceiling)
257 static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
259 struct vm_area_struct *dst_vma,
260 unsigned long dst_addr,
261 unsigned long src_addr,
268 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
274 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
279 static inline void putback_active_hugepage(struct page *page)
283 static inline void move_hugetlb_state(struct page *oldpage,
284 struct page *newpage, int reason)
288 static inline unsigned long hugetlb_change_protection(
289 struct vm_area_struct *vma, unsigned long address,
290 unsigned long end, pgprot_t newprot)
295 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
296 struct vm_area_struct *vma, unsigned long start,
297 unsigned long end, struct page *ref_page)
302 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
303 struct vm_area_struct *vma, unsigned long start,
304 unsigned long end, struct page *ref_page)
309 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
310 struct vm_area_struct *vma, unsigned long address,
317 #endif /* !CONFIG_HUGETLB_PAGE */
319 * hugepages at page global directory. If arch support
320 * hugepages at pgd level, they need to define this.
323 #define pgd_huge(x) 0
326 #define p4d_huge(x) 0
330 static inline int pgd_write(pgd_t pgd)
337 #define HUGETLB_ANON_FILE "anon_hugepage"
341 * The file will be used as an shm file so shmfs accounting rules
344 HUGETLB_SHMFS_INODE = 1,
346 * The file is being created on the internal vfs mount and shmfs
347 * accounting rules do not apply
349 HUGETLB_ANONHUGE_INODE = 2,
352 #ifdef CONFIG_HUGETLBFS
353 struct hugetlbfs_sb_info {
354 long max_inodes; /* inodes allowed */
355 long free_inodes; /* inodes free */
356 spinlock_t stat_lock;
357 struct hstate *hstate;
358 struct hugepage_subpool *spool;
364 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
366 return sb->s_fs_info;
369 struct hugetlbfs_inode_info {
370 struct shared_policy policy;
371 struct inode vfs_inode;
375 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
377 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
380 extern const struct file_operations hugetlbfs_file_operations;
381 extern const struct vm_operations_struct hugetlb_vm_ops;
382 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
383 struct user_struct **user, int creat_flags,
386 static inline bool is_file_hugepages(struct file *file)
388 if (file->f_op == &hugetlbfs_file_operations)
391 return is_file_shm_hugepages(file);
395 #else /* !CONFIG_HUGETLBFS */
397 #define is_file_hugepages(file) false
398 static inline struct file *
399 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
400 struct user_struct **user, int creat_flags,
403 return ERR_PTR(-ENOSYS);
406 #endif /* !CONFIG_HUGETLBFS */
408 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
409 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
410 unsigned long len, unsigned long pgoff,
411 unsigned long flags);
412 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
414 #ifdef CONFIG_HUGETLB_PAGE
416 #define HSTATE_NAME_LEN 32
417 /* Defines one hugetlb page size */
419 int next_nid_to_alloc;
420 int next_nid_to_free;
423 unsigned long max_huge_pages;
424 unsigned long nr_huge_pages;
425 unsigned long free_huge_pages;
426 unsigned long resv_huge_pages;
427 unsigned long surplus_huge_pages;
428 unsigned long nr_overcommit_huge_pages;
429 struct list_head hugepage_activelist;
430 struct list_head hugepage_freelists[MAX_NUMNODES];
431 unsigned int nr_huge_pages_node[MAX_NUMNODES];
432 unsigned int free_huge_pages_node[MAX_NUMNODES];
433 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
434 #ifdef CONFIG_CGROUP_HUGETLB
435 /* cgroup control files */
436 struct cftype cgroup_files[5];
438 char name[HSTATE_NAME_LEN];
441 struct huge_bootmem_page {
442 struct list_head list;
443 struct hstate *hstate;
446 struct page *alloc_huge_page(struct vm_area_struct *vma,
447 unsigned long addr, int avoid_reserve);
448 struct page *alloc_huge_page_node(struct hstate *h, int nid);
449 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
451 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
452 unsigned long address);
453 struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
454 int nid, nodemask_t *nmask);
455 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
459 int __init __alloc_bootmem_huge_page(struct hstate *h);
460 int __init alloc_bootmem_huge_page(struct hstate *h);
462 void __init hugetlb_bad_size(void);
463 void __init hugetlb_add_hstate(unsigned order);
464 struct hstate *size_to_hstate(unsigned long size);
466 #ifndef HUGE_MAX_HSTATE
467 #define HUGE_MAX_HSTATE 1
470 extern struct hstate hstates[HUGE_MAX_HSTATE];
471 extern unsigned int default_hstate_idx;
473 #define default_hstate (hstates[default_hstate_idx])
475 static inline struct hstate *hstate_inode(struct inode *i)
477 return HUGETLBFS_SB(i->i_sb)->hstate;
480 static inline struct hstate *hstate_file(struct file *f)
482 return hstate_inode(file_inode(f));
485 static inline struct hstate *hstate_sizelog(int page_size_log)
488 return &default_hstate;
490 return size_to_hstate(1UL << page_size_log);
493 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
495 return hstate_file(vma->vm_file);
498 static inline unsigned long huge_page_size(struct hstate *h)
500 return (unsigned long)PAGE_SIZE << h->order;
503 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
505 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
507 static inline unsigned long huge_page_mask(struct hstate *h)
512 static inline unsigned int huge_page_order(struct hstate *h)
517 static inline unsigned huge_page_shift(struct hstate *h)
519 return h->order + PAGE_SHIFT;
522 static inline bool hstate_is_gigantic(struct hstate *h)
524 return huge_page_order(h) >= MAX_ORDER;
527 static inline unsigned int pages_per_huge_page(struct hstate *h)
529 return 1 << h->order;
532 static inline unsigned int blocks_per_huge_page(struct hstate *h)
534 return huge_page_size(h) / 512;
537 #include <asm/hugetlb.h>
539 #ifndef arch_make_huge_pte
540 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
541 struct page *page, int writable)
547 static inline struct hstate *page_hstate(struct page *page)
549 VM_BUG_ON_PAGE(!PageHuge(page), page);
550 return size_to_hstate(page_size(page));
553 static inline unsigned hstate_index_to_shift(unsigned index)
555 return hstates[index].order + PAGE_SHIFT;
558 static inline int hstate_index(struct hstate *h)
563 pgoff_t __basepage_index(struct page *page);
565 /* Return page->index in PAGE_SIZE units */
566 static inline pgoff_t basepage_index(struct page *page)
568 if (!PageCompound(page))
571 return __basepage_index(page);
574 extern int dissolve_free_huge_page(struct page *page);
575 extern int dissolve_free_huge_pages(unsigned long start_pfn,
576 unsigned long end_pfn);
578 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
579 #ifndef arch_hugetlb_migration_supported
580 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
582 if ((huge_page_shift(h) == PMD_SHIFT) ||
583 (huge_page_shift(h) == PUD_SHIFT) ||
584 (huge_page_shift(h) == PGDIR_SHIFT))
591 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
597 static inline bool hugepage_migration_supported(struct hstate *h)
599 return arch_hugetlb_migration_supported(h);
603 * Movability check is different as compared to migration check.
604 * It determines whether or not a huge page should be placed on
605 * movable zone or not. Movability of any huge page should be
606 * required only if huge page size is supported for migration.
607 * There wont be any reason for the huge page to be movable if
608 * it is not migratable to start with. Also the size of the huge
609 * page should be large enough to be placed under a movable zone
610 * and still feasible enough to be migratable. Just the presence
611 * in movable zone does not make the migration feasible.
613 * So even though large huge page sizes like the gigantic ones
614 * are migratable they should not be movable because its not
615 * feasible to migrate them from movable zone.
617 static inline bool hugepage_movable_supported(struct hstate *h)
619 if (!hugepage_migration_supported(h))
622 if (hstate_is_gigantic(h))
627 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
628 struct mm_struct *mm, pte_t *pte)
630 if (huge_page_size(h) == PMD_SIZE)
631 return pmd_lockptr(mm, (pmd_t *) pte);
632 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
633 return &mm->page_table_lock;
636 #ifndef hugepages_supported
638 * Some platform decide whether they support huge pages at boot
639 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
640 * when there is no such support
642 #define hugepages_supported() (HPAGE_SHIFT != 0)
645 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
647 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
649 atomic_long_add(l, &mm->hugetlb_usage);
652 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
654 atomic_long_sub(l, &mm->hugetlb_usage);
657 #ifndef set_huge_swap_pte_at
658 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
659 pte_t *ptep, pte_t pte, unsigned long sz)
661 set_huge_pte_at(mm, addr, ptep, pte);
665 #ifndef huge_ptep_modify_prot_start
666 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
667 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
668 unsigned long addr, pte_t *ptep)
670 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
674 #ifndef huge_ptep_modify_prot_commit
675 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
676 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
677 unsigned long addr, pte_t *ptep,
678 pte_t old_pte, pte_t pte)
680 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
684 #else /* CONFIG_HUGETLB_PAGE */
687 static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
694 static inline struct page *alloc_huge_page_node(struct hstate *h, int nid)
699 static inline struct page *
700 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask)
705 static inline struct page *alloc_huge_page_vma(struct hstate *h,
706 struct vm_area_struct *vma,
707 unsigned long address)
712 static inline int __alloc_bootmem_huge_page(struct hstate *h)
717 static inline struct hstate *hstate_file(struct file *f)
722 static inline struct hstate *hstate_sizelog(int page_size_log)
727 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
732 static inline struct hstate *hstate_inode(struct inode *i)
737 static inline struct hstate *page_hstate(struct page *page)
742 static inline unsigned long huge_page_size(struct hstate *h)
747 static inline unsigned long huge_page_mask(struct hstate *h)
752 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
757 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
762 static inline unsigned int huge_page_order(struct hstate *h)
767 static inline unsigned int huge_page_shift(struct hstate *h)
772 static inline bool hstate_is_gigantic(struct hstate *h)
777 static inline unsigned int pages_per_huge_page(struct hstate *h)
782 static inline unsigned hstate_index_to_shift(unsigned index)
787 static inline int hstate_index(struct hstate *h)
792 static inline pgoff_t basepage_index(struct page *page)
797 static inline int dissolve_free_huge_page(struct page *page)
802 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
803 unsigned long end_pfn)
808 static inline bool hugepage_migration_supported(struct hstate *h)
813 static inline bool hugepage_movable_supported(struct hstate *h)
818 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
819 struct mm_struct *mm, pte_t *pte)
821 return &mm->page_table_lock;
824 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
828 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
832 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
833 pte_t *ptep, pte_t pte, unsigned long sz)
836 #endif /* CONFIG_HUGETLB_PAGE */
838 static inline spinlock_t *huge_pte_lock(struct hstate *h,
839 struct mm_struct *mm, pte_t *pte)
843 ptl = huge_pte_lockptr(h, mm, pte);
848 #endif /* _LINUX_HUGETLB_H */