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
,
109 pgoff_t idx
, unsigned long address
);
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 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
168 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
169 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
170 static inline void hugetlb_report_meminfo(struct seq_file
*m
)
173 #define hugetlb_report_node_meminfo(n, buf) 0
174 static inline void hugetlb_show_meminfo(void)
177 #define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
178 #define follow_huge_pmd(mm, addr, pmd, flags) NULL
179 #define follow_huge_pud(mm, addr, pud, flags) NULL
180 #define follow_huge_pgd(mm, addr, pgd, flags) NULL
181 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
182 #define pmd_huge(x) 0
183 #define pud_huge(x) 0
184 #define is_hugepage_only_range(mm, addr, len) 0
185 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
186 #define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
187 src_addr, pagep) ({ BUG(); 0; })
188 #define huge_pte_offset(mm, address, sz) 0
190 static inline bool isolate_huge_page(struct page
*page
, struct list_head
*list
)
194 #define putback_active_hugepage(p) do {} while (0)
195 #define move_hugetlb_state(old, new, reason) do {} while (0)
197 static inline unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
198 unsigned long address
, unsigned long end
, pgprot_t newprot
)
203 static inline void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
204 struct vm_area_struct
*vma
, unsigned long start
,
205 unsigned long end
, struct page
*ref_page
)
210 static inline void __unmap_hugepage_range(struct mmu_gather
*tlb
,
211 struct vm_area_struct
*vma
, unsigned long start
,
212 unsigned long end
, struct page
*ref_page
)
216 static inline vm_fault_t
hugetlb_fault(struct mm_struct
*mm
,
217 struct vm_area_struct
*vma
, unsigned long address
,
224 #endif /* !CONFIG_HUGETLB_PAGE */
226 * hugepages at page global directory. If arch support
227 * hugepages at pgd level, they need to define this.
230 #define pgd_huge(x) 0
233 #define p4d_huge(x) 0
237 static inline int pgd_write(pgd_t pgd
)
244 #define HUGETLB_ANON_FILE "anon_hugepage"
248 * The file will be used as an shm file so shmfs accounting rules
251 HUGETLB_SHMFS_INODE
= 1,
253 * The file is being created on the internal vfs mount and shmfs
254 * accounting rules do not apply
256 HUGETLB_ANONHUGE_INODE
= 2,
259 #ifdef CONFIG_HUGETLBFS
260 struct hugetlbfs_sb_info
{
261 long max_inodes
; /* inodes allowed */
262 long free_inodes
; /* inodes free */
263 spinlock_t stat_lock
;
264 struct hstate
*hstate
;
265 struct hugepage_subpool
*spool
;
271 static inline struct hugetlbfs_sb_info
*HUGETLBFS_SB(struct super_block
*sb
)
273 return sb
->s_fs_info
;
276 struct hugetlbfs_inode_info
{
277 struct shared_policy policy
;
278 struct inode vfs_inode
;
282 static inline struct hugetlbfs_inode_info
*HUGETLBFS_I(struct inode
*inode
)
284 return container_of(inode
, struct hugetlbfs_inode_info
, vfs_inode
);
287 extern const struct file_operations hugetlbfs_file_operations
;
288 extern const struct vm_operations_struct hugetlb_vm_ops
;
289 struct file
*hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acct
,
290 struct user_struct
**user
, int creat_flags
,
293 static inline bool is_file_hugepages(struct file
*file
)
295 if (file
->f_op
== &hugetlbfs_file_operations
)
298 return is_file_shm_hugepages(file
);
302 #else /* !CONFIG_HUGETLBFS */
304 #define is_file_hugepages(file) false
305 static inline struct file
*
306 hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acctflag
,
307 struct user_struct
**user
, int creat_flags
,
310 return ERR_PTR(-ENOSYS
);
313 #endif /* !CONFIG_HUGETLBFS */
315 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
316 unsigned long hugetlb_get_unmapped_area(struct file
*file
, unsigned long addr
,
317 unsigned long len
, unsigned long pgoff
,
318 unsigned long flags
);
319 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
321 #ifdef CONFIG_HUGETLB_PAGE
323 #define HSTATE_NAME_LEN 32
324 /* Defines one hugetlb page size */
326 int next_nid_to_alloc
;
327 int next_nid_to_free
;
330 unsigned long max_huge_pages
;
331 unsigned long nr_huge_pages
;
332 unsigned long free_huge_pages
;
333 unsigned long resv_huge_pages
;
334 unsigned long surplus_huge_pages
;
335 unsigned long nr_overcommit_huge_pages
;
336 struct list_head hugepage_activelist
;
337 struct list_head hugepage_freelists
[MAX_NUMNODES
];
338 unsigned int nr_huge_pages_node
[MAX_NUMNODES
];
339 unsigned int free_huge_pages_node
[MAX_NUMNODES
];
340 unsigned int surplus_huge_pages_node
[MAX_NUMNODES
];
341 #ifdef CONFIG_CGROUP_HUGETLB
342 /* cgroup control files */
343 struct cftype cgroup_files
[5];
345 char name
[HSTATE_NAME_LEN
];
348 struct huge_bootmem_page
{
349 struct list_head list
;
350 struct hstate
*hstate
;
353 struct page
*alloc_huge_page(struct vm_area_struct
*vma
,
354 unsigned long addr
, int avoid_reserve
);
355 struct page
*alloc_huge_page_node(struct hstate
*h
, int nid
);
356 struct page
*alloc_huge_page_nodemask(struct hstate
*h
, int preferred_nid
,
358 struct page
*alloc_huge_page_vma(struct hstate
*h
, struct vm_area_struct
*vma
,
359 unsigned long address
);
360 struct page
*alloc_migrate_huge_page(struct hstate
*h
, gfp_t gfp_mask
,
361 int nid
, nodemask_t
*nmask
);
362 int huge_add_to_page_cache(struct page
*page
, struct address_space
*mapping
,
366 int __init
__alloc_bootmem_huge_page(struct hstate
*h
);
367 int __init
alloc_bootmem_huge_page(struct hstate
*h
);
369 void __init
hugetlb_bad_size(void);
370 void __init
hugetlb_add_hstate(unsigned order
);
371 struct hstate
*size_to_hstate(unsigned long size
);
373 #ifndef HUGE_MAX_HSTATE
374 #define HUGE_MAX_HSTATE 1
377 extern struct hstate hstates
[HUGE_MAX_HSTATE
];
378 extern unsigned int default_hstate_idx
;
380 #define default_hstate (hstates[default_hstate_idx])
382 static inline struct hstate
*hstate_inode(struct inode
*i
)
384 return HUGETLBFS_SB(i
->i_sb
)->hstate
;
387 static inline struct hstate
*hstate_file(struct file
*f
)
389 return hstate_inode(file_inode(f
));
392 static inline struct hstate
*hstate_sizelog(int page_size_log
)
395 return &default_hstate
;
397 return size_to_hstate(1UL << page_size_log
);
400 static inline struct hstate
*hstate_vma(struct vm_area_struct
*vma
)
402 return hstate_file(vma
->vm_file
);
405 static inline unsigned long huge_page_size(struct hstate
*h
)
407 return (unsigned long)PAGE_SIZE
<< h
->order
;
410 extern unsigned long vma_kernel_pagesize(struct vm_area_struct
*vma
);
412 extern unsigned long vma_mmu_pagesize(struct vm_area_struct
*vma
);
414 static inline unsigned long huge_page_mask(struct hstate
*h
)
419 static inline unsigned int huge_page_order(struct hstate
*h
)
424 static inline unsigned huge_page_shift(struct hstate
*h
)
426 return h
->order
+ PAGE_SHIFT
;
429 static inline bool hstate_is_gigantic(struct hstate
*h
)
431 return huge_page_order(h
) >= MAX_ORDER
;
434 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
436 return 1 << h
->order
;
439 static inline unsigned int blocks_per_huge_page(struct hstate
*h
)
441 return huge_page_size(h
) / 512;
444 #include <asm/hugetlb.h>
446 #ifndef arch_make_huge_pte
447 static inline pte_t
arch_make_huge_pte(pte_t entry
, struct vm_area_struct
*vma
,
448 struct page
*page
, int writable
)
454 static inline struct hstate
*page_hstate(struct page
*page
)
456 VM_BUG_ON_PAGE(!PageHuge(page
), page
);
457 return size_to_hstate(PAGE_SIZE
<< compound_order(page
));
460 static inline unsigned hstate_index_to_shift(unsigned index
)
462 return hstates
[index
].order
+ PAGE_SHIFT
;
465 static inline int hstate_index(struct hstate
*h
)
470 pgoff_t
__basepage_index(struct page
*page
);
472 /* Return page->index in PAGE_SIZE units */
473 static inline pgoff_t
basepage_index(struct page
*page
)
475 if (!PageCompound(page
))
478 return __basepage_index(page
);
481 extern int dissolve_free_huge_page(struct page
*page
);
482 extern int dissolve_free_huge_pages(unsigned long start_pfn
,
483 unsigned long end_pfn
);
485 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
486 #ifndef arch_hugetlb_migration_supported
487 static inline bool arch_hugetlb_migration_supported(struct hstate
*h
)
489 if ((huge_page_shift(h
) == PMD_SHIFT
) ||
490 (huge_page_shift(h
) == PUD_SHIFT
) ||
491 (huge_page_shift(h
) == PGDIR_SHIFT
))
498 static inline bool arch_hugetlb_migration_supported(struct hstate
*h
)
504 static inline bool hugepage_migration_supported(struct hstate
*h
)
506 return arch_hugetlb_migration_supported(h
);
510 * Movability check is different as compared to migration check.
511 * It determines whether or not a huge page should be placed on
512 * movable zone or not. Movability of any huge page should be
513 * required only if huge page size is supported for migration.
514 * There wont be any reason for the huge page to be movable if
515 * it is not migratable to start with. Also the size of the huge
516 * page should be large enough to be placed under a movable zone
517 * and still feasible enough to be migratable. Just the presence
518 * in movable zone does not make the migration feasible.
520 * So even though large huge page sizes like the gigantic ones
521 * are migratable they should not be movable because its not
522 * feasible to migrate them from movable zone.
524 static inline bool hugepage_movable_supported(struct hstate
*h
)
526 if (!hugepage_migration_supported(h
))
529 if (hstate_is_gigantic(h
))
534 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
535 struct mm_struct
*mm
, pte_t
*pte
)
537 if (huge_page_size(h
) == PMD_SIZE
)
538 return pmd_lockptr(mm
, (pmd_t
*) pte
);
539 VM_BUG_ON(huge_page_size(h
) == PAGE_SIZE
);
540 return &mm
->page_table_lock
;
543 #ifndef hugepages_supported
545 * Some platform decide whether they support huge pages at boot
546 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
547 * when there is no such support
549 #define hugepages_supported() (HPAGE_SHIFT != 0)
552 void hugetlb_report_usage(struct seq_file
*m
, struct mm_struct
*mm
);
554 static inline void hugetlb_count_add(long l
, struct mm_struct
*mm
)
556 atomic_long_add(l
, &mm
->hugetlb_usage
);
559 static inline void hugetlb_count_sub(long l
, struct mm_struct
*mm
)
561 atomic_long_sub(l
, &mm
->hugetlb_usage
);
564 #ifndef set_huge_swap_pte_at
565 static inline void set_huge_swap_pte_at(struct mm_struct
*mm
, unsigned long addr
,
566 pte_t
*ptep
, pte_t pte
, unsigned long sz
)
568 set_huge_pte_at(mm
, addr
, ptep
, pte
);
572 #ifndef huge_ptep_modify_prot_start
573 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
574 static inline pte_t
huge_ptep_modify_prot_start(struct vm_area_struct
*vma
,
575 unsigned long addr
, pte_t
*ptep
)
577 return huge_ptep_get_and_clear(vma
->vm_mm
, addr
, ptep
);
581 #ifndef huge_ptep_modify_prot_commit
582 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
583 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct
*vma
,
584 unsigned long addr
, pte_t
*ptep
,
585 pte_t old_pte
, pte_t pte
)
587 set_huge_pte_at(vma
->vm_mm
, addr
, ptep
, pte
);
591 #else /* CONFIG_HUGETLB_PAGE */
594 static inline struct page
*alloc_huge_page(struct vm_area_struct
*vma
,
601 static inline struct page
*alloc_huge_page_node(struct hstate
*h
, int nid
)
606 static inline struct page
*
607 alloc_huge_page_nodemask(struct hstate
*h
, int preferred_nid
, nodemask_t
*nmask
)
612 static inline struct page
*alloc_huge_page_vma(struct hstate
*h
,
613 struct vm_area_struct
*vma
,
614 unsigned long address
)
619 static inline int __alloc_bootmem_huge_page(struct hstate
*h
)
624 static inline struct hstate
*hstate_file(struct file
*f
)
629 static inline struct hstate
*hstate_sizelog(int page_size_log
)
634 static inline struct hstate
*hstate_vma(struct vm_area_struct
*vma
)
639 static inline struct hstate
*hstate_inode(struct inode
*i
)
644 static inline struct hstate
*page_hstate(struct page
*page
)
649 static inline unsigned long huge_page_size(struct hstate
*h
)
654 static inline unsigned long huge_page_mask(struct hstate
*h
)
659 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct
*vma
)
664 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct
*vma
)
669 static inline unsigned int huge_page_order(struct hstate
*h
)
674 static inline unsigned int huge_page_shift(struct hstate
*h
)
679 static inline bool hstate_is_gigantic(struct hstate
*h
)
684 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
689 static inline unsigned hstate_index_to_shift(unsigned index
)
694 static inline int hstate_index(struct hstate
*h
)
699 static inline pgoff_t
basepage_index(struct page
*page
)
704 static inline int dissolve_free_huge_page(struct page
*page
)
709 static inline int dissolve_free_huge_pages(unsigned long start_pfn
,
710 unsigned long end_pfn
)
715 static inline bool hugepage_migration_supported(struct hstate
*h
)
720 static inline bool hugepage_movable_supported(struct hstate
*h
)
725 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
726 struct mm_struct
*mm
, pte_t
*pte
)
728 return &mm
->page_table_lock
;
731 static inline void hugetlb_report_usage(struct seq_file
*f
, struct mm_struct
*m
)
735 static inline void hugetlb_count_sub(long l
, struct mm_struct
*mm
)
739 static inline void set_huge_swap_pte_at(struct mm_struct
*mm
, unsigned long addr
,
740 pte_t
*ptep
, pte_t pte
, unsigned long sz
)
743 #endif /* CONFIG_HUGETLB_PAGE */
745 static inline spinlock_t
*huge_pte_lock(struct hstate
*h
,
746 struct mm_struct
*mm
, pte_t
*pte
)
750 ptl
= huge_pte_lockptr(h
, mm
, pte
);
755 #endif /* _LINUX_HUGETLB_H */