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>
20 * Some architectures requires a hugepage directory format that is
21 * required to support multiple hugepage sizes. For example
22 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
23 * introduced the same on powerpc. This allows for a more flexible hugepage
26 typedef struct { unsigned long pd
; } hugepd_t
;
27 #define is_hugepd(hugepd) (0)
28 #define __hugepd(x) ((hugepd_t) { (x) })
29 static inline int gup_huge_pd(hugepd_t hugepd
, unsigned long addr
,
30 unsigned pdshift
, unsigned long end
,
31 int write
, struct page
**pages
, int *nr
)
36 extern int gup_huge_pd(hugepd_t hugepd
, unsigned long addr
,
37 unsigned pdshift
, unsigned long end
,
38 int write
, struct page
**pages
, int *nr
);
42 #ifdef CONFIG_HUGETLB_PAGE
44 #include <linux/mempolicy.h>
45 #include <linux/shm.h>
46 #include <asm/tlbflush.h>
48 struct hugepage_subpool
{
51 long max_hpages
; /* Maximum huge pages or -1 if no maximum. */
52 long used_hpages
; /* Used count against maximum, includes */
53 /* both alloced and reserved pages. */
54 struct hstate
*hstate
;
55 long min_hpages
; /* Minimum huge pages or -1 if no minimum. */
56 long rsv_hpages
; /* Pages reserved against global pool to */
57 /* sasitfy minimum size. */
63 struct list_head regions
;
64 long adds_in_progress
;
65 struct list_head region_cache
;
66 long region_cache_count
;
68 extern struct resv_map
*resv_map_alloc(void);
69 void resv_map_release(struct kref
*ref
);
71 extern spinlock_t hugetlb_lock
;
72 extern int hugetlb_max_hstate __read_mostly
;
73 #define for_each_hstate(h) \
74 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
76 struct hugepage_subpool
*hugepage_new_subpool(struct hstate
*h
, long max_hpages
,
78 void hugepage_put_subpool(struct hugepage_subpool
*spool
);
80 void reset_vma_resv_huge_pages(struct vm_area_struct
*vma
);
81 int hugetlb_sysctl_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
82 int hugetlb_overcommit_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
83 int hugetlb_treat_movable_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
86 int hugetlb_mempolicy_sysctl_handler(struct ctl_table
*, int,
87 void __user
*, size_t *, loff_t
*);
90 int copy_hugetlb_page_range(struct mm_struct
*, struct mm_struct
*, struct vm_area_struct
*);
91 long follow_hugetlb_page(struct mm_struct
*, struct vm_area_struct
*,
92 struct page
**, struct vm_area_struct
**,
93 unsigned long *, unsigned long *, long, unsigned int,
95 void unmap_hugepage_range(struct vm_area_struct
*,
96 unsigned long, unsigned long, struct page
*);
97 void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
98 struct vm_area_struct
*vma
,
99 unsigned long start
, unsigned long end
,
100 struct page
*ref_page
);
101 void __unmap_hugepage_range(struct mmu_gather
*tlb
, struct vm_area_struct
*vma
,
102 unsigned long start
, unsigned long end
,
103 struct page
*ref_page
);
104 void hugetlb_report_meminfo(struct seq_file
*);
105 int hugetlb_report_node_meminfo(int, char *);
106 void hugetlb_show_meminfo(void);
107 unsigned long hugetlb_total_pages(void);
108 int hugetlb_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
109 unsigned long address
, unsigned int flags
);
110 int hugetlb_mcopy_atomic_pte(struct mm_struct
*dst_mm
, pte_t
*dst_pte
,
111 struct vm_area_struct
*dst_vma
,
112 unsigned long dst_addr
,
113 unsigned long src_addr
,
114 struct page
**pagep
);
115 int hugetlb_reserve_pages(struct inode
*inode
, long from
, long to
,
116 struct vm_area_struct
*vma
,
117 vm_flags_t vm_flags
);
118 long hugetlb_unreserve_pages(struct inode
*inode
, long start
, long end
,
120 bool isolate_huge_page(struct page
*page
, struct list_head
*list
);
121 void putback_active_hugepage(struct page
*page
);
122 void free_huge_page(struct page
*page
);
123 void hugetlb_fix_reserve_counts(struct inode
*inode
);
124 extern struct mutex
*hugetlb_fault_mutex_table
;
125 u32
hugetlb_fault_mutex_hash(struct hstate
*h
, struct address_space
*mapping
,
126 pgoff_t idx
, unsigned long address
);
128 pte_t
*huge_pmd_share(struct mm_struct
*mm
, unsigned long addr
, pud_t
*pud
);
130 extern int hugepages_treat_as_movable
;
131 extern int sysctl_hugetlb_shm_group
;
132 extern struct list_head huge_boot_pages
;
136 pte_t
*huge_pte_alloc(struct mm_struct
*mm
,
137 unsigned long addr
, unsigned long sz
);
138 pte_t
*huge_pte_offset(struct mm_struct
*mm
,
139 unsigned long addr
, unsigned long sz
);
140 int huge_pmd_unshare(struct mm_struct
*mm
, unsigned long *addr
, pte_t
*ptep
);
141 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct
*vma
,
142 unsigned long *start
, unsigned long *end
);
143 struct page
*follow_huge_addr(struct mm_struct
*mm
, unsigned long address
,
145 struct page
*follow_huge_pd(struct vm_area_struct
*vma
,
146 unsigned long address
, hugepd_t hpd
,
147 int flags
, int pdshift
);
148 struct page
*follow_huge_pmd(struct mm_struct
*mm
, unsigned long address
,
149 pmd_t
*pmd
, int flags
);
150 struct page
*follow_huge_pud(struct mm_struct
*mm
, unsigned long address
,
151 pud_t
*pud
, int flags
);
152 struct page
*follow_huge_pgd(struct mm_struct
*mm
, unsigned long address
,
153 pgd_t
*pgd
, int flags
);
155 int pmd_huge(pmd_t pmd
);
156 int pud_huge(pud_t pud
);
157 unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
158 unsigned long address
, unsigned long end
, pgprot_t newprot
);
160 bool is_hugetlb_entry_migration(pte_t pte
);
161 #else /* !CONFIG_HUGETLB_PAGE */
163 static inline void reset_vma_resv_huge_pages(struct vm_area_struct
*vma
)
167 static inline unsigned long hugetlb_total_pages(void)
172 static inline int huge_pmd_unshare(struct mm_struct
*mm
, unsigned long *addr
,
178 static inline void adjust_range_if_pmd_sharing_possible(
179 struct vm_area_struct
*vma
,
180 unsigned long *start
, unsigned long *end
)
184 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
185 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
186 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
187 static inline void hugetlb_report_meminfo(struct seq_file
*m
)
190 #define hugetlb_report_node_meminfo(n, buf) 0
191 static inline void hugetlb_show_meminfo(void)
194 #define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
195 #define follow_huge_pmd(mm, addr, pmd, flags) NULL
196 #define follow_huge_pud(mm, addr, pud, flags) NULL
197 #define follow_huge_pgd(mm, addr, pgd, flags) NULL
198 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
199 #define pmd_huge(x) 0
200 #define pud_huge(x) 0
201 #define is_hugepage_only_range(mm, addr, len) 0
202 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
203 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
204 #define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
205 src_addr, pagep) ({ BUG(); 0; })
206 #define huge_pte_offset(mm, address, sz) 0
208 static inline bool isolate_huge_page(struct page
*page
, struct list_head
*list
)
212 #define putback_active_hugepage(p) do {} while (0)
214 static inline unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
215 unsigned long address
, unsigned long end
, pgprot_t newprot
)
220 static inline void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
221 struct vm_area_struct
*vma
, unsigned long start
,
222 unsigned long end
, struct page
*ref_page
)
227 static inline void __unmap_hugepage_range(struct mmu_gather
*tlb
,
228 struct vm_area_struct
*vma
, unsigned long start
,
229 unsigned long end
, struct page
*ref_page
)
234 #endif /* !CONFIG_HUGETLB_PAGE */
236 * hugepages at page global directory. If arch support
237 * hugepages at pgd level, they need to define this.
240 #define pgd_huge(x) 0
243 #define p4d_huge(x) 0
247 static inline int pgd_write(pgd_t pgd
)
254 #define HUGETLB_ANON_FILE "anon_hugepage"
258 * The file will be used as an shm file so shmfs accounting rules
261 HUGETLB_SHMFS_INODE
= 1,
263 * The file is being created on the internal vfs mount and shmfs
264 * accounting rules do not apply
266 HUGETLB_ANONHUGE_INODE
= 2,
269 #ifdef CONFIG_HUGETLBFS
270 struct hugetlbfs_sb_info
{
271 long max_inodes
; /* inodes allowed */
272 long free_inodes
; /* inodes free */
273 spinlock_t stat_lock
;
274 struct hstate
*hstate
;
275 struct hugepage_subpool
*spool
;
281 static inline struct hugetlbfs_sb_info
*HUGETLBFS_SB(struct super_block
*sb
)
283 return sb
->s_fs_info
;
286 extern const struct file_operations hugetlbfs_file_operations
;
287 extern const struct vm_operations_struct hugetlb_vm_ops
;
288 struct file
*hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acct
,
289 struct user_struct
**user
, int creat_flags
,
292 static inline bool is_file_hugepages(struct file
*file
)
294 if (file
->f_op
== &hugetlbfs_file_operations
)
297 return is_file_shm_hugepages(file
);
301 #else /* !CONFIG_HUGETLBFS */
303 #define is_file_hugepages(file) false
304 static inline struct file
*
305 hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acctflag
,
306 struct user_struct
**user
, int creat_flags
,
309 return ERR_PTR(-ENOSYS
);
312 #endif /* !CONFIG_HUGETLBFS */
314 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
315 unsigned long hugetlb_get_unmapped_area(struct file
*file
, unsigned long addr
,
316 unsigned long len
, unsigned long pgoff
,
317 unsigned long flags
);
318 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
320 #ifdef CONFIG_HUGETLB_PAGE
322 #define HSTATE_NAME_LEN 32
323 /* Defines one hugetlb page size */
325 int next_nid_to_alloc
;
326 int next_nid_to_free
;
329 unsigned long max_huge_pages
;
330 unsigned long nr_huge_pages
;
331 unsigned long free_huge_pages
;
332 unsigned long resv_huge_pages
;
333 unsigned long surplus_huge_pages
;
334 unsigned long nr_overcommit_huge_pages
;
335 struct list_head hugepage_activelist
;
336 struct list_head hugepage_freelists
[MAX_NUMNODES
];
337 unsigned int nr_huge_pages_node
[MAX_NUMNODES
];
338 unsigned int free_huge_pages_node
[MAX_NUMNODES
];
339 unsigned int surplus_huge_pages_node
[MAX_NUMNODES
];
340 #ifdef CONFIG_CGROUP_HUGETLB
341 /* cgroup control files */
342 struct cftype cgroup_files
[5];
344 char name
[HSTATE_NAME_LEN
];
347 struct huge_bootmem_page
{
348 struct list_head list
;
349 struct hstate
*hstate
;
350 #ifdef CONFIG_HIGHMEM
355 struct page
*alloc_huge_page(struct vm_area_struct
*vma
,
356 unsigned long addr
, int avoid_reserve
);
357 struct page
*alloc_huge_page_node(struct hstate
*h
, int nid
);
358 struct page
*alloc_huge_page_noerr(struct vm_area_struct
*vma
,
359 unsigned long addr
, int avoid_reserve
);
360 struct page
*alloc_huge_page_nodemask(struct hstate
*h
, int preferred_nid
,
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
);
484 static inline bool hugepage_migration_supported(struct hstate
*h
)
486 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
487 if ((huge_page_shift(h
) == PMD_SHIFT
) ||
488 (huge_page_shift(h
) == PGDIR_SHIFT
))
497 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
498 struct mm_struct
*mm
, pte_t
*pte
)
500 if (huge_page_size(h
) == PMD_SIZE
)
501 return pmd_lockptr(mm
, (pmd_t
*) pte
);
502 VM_BUG_ON(huge_page_size(h
) == PAGE_SIZE
);
503 return &mm
->page_table_lock
;
506 #ifndef hugepages_supported
508 * Some platform decide whether they support huge pages at boot
509 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
510 * when there is no such support
512 #define hugepages_supported() (HPAGE_SHIFT != 0)
515 void hugetlb_report_usage(struct seq_file
*m
, struct mm_struct
*mm
);
517 static inline void hugetlb_count_add(long l
, struct mm_struct
*mm
)
519 atomic_long_add(l
, &mm
->hugetlb_usage
);
522 static inline void hugetlb_count_sub(long l
, struct mm_struct
*mm
)
524 atomic_long_sub(l
, &mm
->hugetlb_usage
);
527 #ifndef set_huge_swap_pte_at
528 static inline void set_huge_swap_pte_at(struct mm_struct
*mm
, unsigned long addr
,
529 pte_t
*ptep
, pte_t pte
, unsigned long sz
)
531 set_huge_pte_at(mm
, addr
, ptep
, pte
);
534 #else /* CONFIG_HUGETLB_PAGE */
536 #define alloc_huge_page(v, a, r) NULL
537 #define alloc_huge_page_node(h, nid) NULL
538 #define alloc_huge_page_nodemask(h, preferred_nid, nmask) NULL
539 #define alloc_huge_page_noerr(v, a, r) NULL
540 #define alloc_bootmem_huge_page(h) NULL
541 #define hstate_file(f) NULL
542 #define hstate_sizelog(s) NULL
543 #define hstate_vma(v) NULL
544 #define hstate_inode(i) NULL
545 #define page_hstate(page) NULL
546 #define huge_page_size(h) PAGE_SIZE
547 #define huge_page_mask(h) PAGE_MASK
548 #define vma_kernel_pagesize(v) PAGE_SIZE
549 #define vma_mmu_pagesize(v) PAGE_SIZE
550 #define huge_page_order(h) 0
551 #define huge_page_shift(h) PAGE_SHIFT
552 static inline bool hstate_is_gigantic(struct hstate
*h
)
557 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
562 static inline unsigned hstate_index_to_shift(unsigned index
)
567 static inline int hstate_index(struct hstate
*h
)
572 static inline pgoff_t
basepage_index(struct page
*page
)
577 static inline int dissolve_free_huge_page(struct page
*page
)
582 static inline int dissolve_free_huge_pages(unsigned long start_pfn
,
583 unsigned long end_pfn
)
588 static inline bool hugepage_migration_supported(struct hstate
*h
)
593 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
594 struct mm_struct
*mm
, pte_t
*pte
)
596 return &mm
->page_table_lock
;
599 static inline void hugetlb_report_usage(struct seq_file
*f
, struct mm_struct
*m
)
603 static inline void hugetlb_count_sub(long l
, struct mm_struct
*mm
)
607 static inline void set_huge_swap_pte_at(struct mm_struct
*mm
, unsigned long addr
,
608 pte_t
*ptep
, pte_t pte
, unsigned long sz
)
611 #endif /* CONFIG_HUGETLB_PAGE */
613 static inline spinlock_t
*huge_pte_lock(struct hstate
*h
,
614 struct mm_struct
*mm
, pte_t
*pte
)
618 ptl
= huge_pte_lockptr(h
, mm
, pte
);
623 #endif /* _LINUX_HUGETLB_H */