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/page_ref.h>
11 #include <linux/list.h>
12 #include <linux/kref.h>
13 #include <asm/pgtable.h>
21 * Some architectures requires a hugepage directory format that is
22 * required to support multiple hugepage sizes. For example
23 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
24 * introduced the same on powerpc. This allows for a more flexible hugepage
27 typedef struct { unsigned long pd; } hugepd_t;
28 #define is_hugepd(hugepd) (0)
29 #define __hugepd(x) ((hugepd_t) { (x) })
30 static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
31 unsigned pdshift, unsigned long end,
32 int write, struct page **pages, int *nr)
37 extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
38 unsigned pdshift, unsigned long end,
39 int write, struct page **pages, int *nr);
43 #ifdef CONFIG_HUGETLB_PAGE
45 #include <linux/mempolicy.h>
46 #include <linux/shm.h>
47 #include <asm/tlbflush.h>
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 alloced 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 /* sasitfy minimum size. */
64 struct list_head regions;
65 long adds_in_progress;
66 struct list_head region_cache;
67 long region_cache_count;
69 extern struct resv_map *resv_map_alloc(void);
70 void resv_map_release(struct kref *ref);
72 extern spinlock_t hugetlb_lock;
73 extern int hugetlb_max_hstate __read_mostly;
74 #define for_each_hstate(h) \
75 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
77 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
79 void hugepage_put_subpool(struct hugepage_subpool *spool);
81 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
82 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
83 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
84 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
87 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
88 void __user *, size_t *, loff_t *);
91 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
92 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
93 struct page **, struct vm_area_struct **,
94 unsigned long *, unsigned long *, long, unsigned int,
96 void unmap_hugepage_range(struct vm_area_struct *,
97 unsigned long, unsigned long, struct page *);
98 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
99 struct vm_area_struct *vma,
100 unsigned long start, unsigned long end,
101 struct page *ref_page);
102 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
103 unsigned long start, unsigned long end,
104 struct page *ref_page);
105 void hugetlb_report_meminfo(struct seq_file *);
106 int hugetlb_report_node_meminfo(int, char *);
107 void hugetlb_show_meminfo(void);
108 unsigned long hugetlb_total_pages(void);
109 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
110 unsigned long address, unsigned int flags);
111 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
112 struct vm_area_struct *dst_vma,
113 unsigned long dst_addr,
114 unsigned long src_addr,
115 struct page **pagep);
116 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
117 struct vm_area_struct *vma,
118 vm_flags_t vm_flags);
119 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
121 bool isolate_huge_page(struct page *page, struct list_head *list);
122 void putback_active_hugepage(struct page *page);
123 void free_huge_page(struct page *page);
124 void hugetlb_fix_reserve_counts(struct inode *inode);
125 extern struct mutex *hugetlb_fault_mutex_table;
126 u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
129 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
131 extern int hugepages_treat_as_movable;
132 extern int sysctl_hugetlb_shm_group;
133 extern struct list_head huge_boot_pages;
137 pte_t *huge_pte_alloc(struct mm_struct *mm,
138 unsigned long addr, unsigned long sz);
139 pte_t *huge_pte_offset(struct mm_struct *mm,
140 unsigned long addr, unsigned long sz);
141 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
142 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
143 unsigned long *start, unsigned long *end);
144 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
146 struct page *follow_huge_pd(struct vm_area_struct *vma,
147 unsigned long address, hugepd_t hpd,
148 int flags, int pdshift);
149 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
150 pmd_t *pmd, int flags);
151 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
152 pud_t *pud, int flags);
153 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
154 pgd_t *pgd, int flags);
156 int pmd_huge(pmd_t pmd);
157 int pud_huge(pud_t pud);
158 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
159 unsigned long address, unsigned long end, pgprot_t newprot);
161 bool is_hugetlb_entry_migration(pte_t pte);
162 #else /* !CONFIG_HUGETLB_PAGE */
164 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
168 static inline unsigned long hugetlb_total_pages(void)
173 static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
179 static inline void adjust_range_if_pmd_sharing_possible(
180 struct vm_area_struct *vma,
181 unsigned long *start, unsigned long *end)
185 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
186 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
187 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
188 static inline void hugetlb_report_meminfo(struct seq_file *m)
191 #define hugetlb_report_node_meminfo(n, buf) 0
192 static inline void hugetlb_show_meminfo(void)
195 #define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
196 #define follow_huge_pmd(mm, addr, pmd, flags) NULL
197 #define follow_huge_pud(mm, addr, pud, flags) NULL
198 #define follow_huge_pgd(mm, addr, pgd, flags) NULL
199 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
200 #define pmd_huge(x) 0
201 #define pud_huge(x) 0
202 #define is_hugepage_only_range(mm, addr, len) 0
203 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
204 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
205 #define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
206 src_addr, pagep) ({ BUG(); 0; })
207 #define huge_pte_offset(mm, address, sz) 0
209 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
213 #define putback_active_hugepage(p) do {} while (0)
215 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
216 unsigned long address, unsigned long end, pgprot_t newprot)
221 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
222 struct vm_area_struct *vma, unsigned long start,
223 unsigned long end, struct page *ref_page)
228 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
229 struct vm_area_struct *vma, unsigned long start,
230 unsigned long end, struct page *ref_page)
235 #endif /* !CONFIG_HUGETLB_PAGE */
237 * hugepages at page global directory. If arch support
238 * hugepages at pgd level, they need to define this.
241 #define pgd_huge(x) 0
244 #define p4d_huge(x) 0
248 static inline int pgd_write(pgd_t pgd)
255 #define HUGETLB_ANON_FILE "anon_hugepage"
259 * The file will be used as an shm file so shmfs accounting rules
262 HUGETLB_SHMFS_INODE = 1,
264 * The file is being created on the internal vfs mount and shmfs
265 * accounting rules do not apply
267 HUGETLB_ANONHUGE_INODE = 2,
270 #ifdef CONFIG_HUGETLBFS
271 struct hugetlbfs_sb_info {
272 long max_inodes; /* inodes allowed */
273 long free_inodes; /* inodes free */
274 spinlock_t stat_lock;
275 struct hstate *hstate;
276 struct hugepage_subpool *spool;
282 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
284 return sb->s_fs_info;
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;
351 #ifdef CONFIG_HIGHMEM
356 struct page *alloc_huge_page(struct vm_area_struct *vma,
357 unsigned long addr, int avoid_reserve);
358 struct page *alloc_huge_page_node(struct hstate *h, int nid);
359 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
360 unsigned long addr, int avoid_reserve);
361 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
363 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
367 int __init __alloc_bootmem_huge_page(struct hstate *h);
368 int __init alloc_bootmem_huge_page(struct hstate *h);
370 void __init hugetlb_bad_size(void);
371 void __init hugetlb_add_hstate(unsigned order);
372 struct hstate *size_to_hstate(unsigned long size);
374 #ifndef HUGE_MAX_HSTATE
375 #define HUGE_MAX_HSTATE 1
378 extern struct hstate hstates[HUGE_MAX_HSTATE];
379 extern unsigned int default_hstate_idx;
381 #define default_hstate (hstates[default_hstate_idx])
383 static inline struct hstate *hstate_inode(struct inode *i)
385 return HUGETLBFS_SB(i->i_sb)->hstate;
388 static inline struct hstate *hstate_file(struct file *f)
390 return hstate_inode(file_inode(f));
393 static inline struct hstate *hstate_sizelog(int page_size_log)
396 return &default_hstate;
398 if (page_size_log < BITS_PER_LONG)
399 return size_to_hstate(1UL << page_size_log);
404 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
406 return hstate_file(vma->vm_file);
409 static inline unsigned long huge_page_size(struct hstate *h)
411 return (unsigned long)PAGE_SIZE << h->order;
414 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
416 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
418 static inline unsigned long huge_page_mask(struct hstate *h)
423 static inline unsigned int huge_page_order(struct hstate *h)
428 static inline unsigned huge_page_shift(struct hstate *h)
430 return h->order + PAGE_SHIFT;
433 static inline bool hstate_is_gigantic(struct hstate *h)
435 return huge_page_order(h) >= MAX_ORDER;
438 static inline unsigned int pages_per_huge_page(struct hstate *h)
440 return 1 << h->order;
443 static inline unsigned int blocks_per_huge_page(struct hstate *h)
445 return huge_page_size(h) / 512;
448 #include <asm/hugetlb.h>
450 #ifndef arch_make_huge_pte
451 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
452 struct page *page, int writable)
458 static inline struct hstate *page_hstate(struct page *page)
460 VM_BUG_ON_PAGE(!PageHuge(page), page);
461 return size_to_hstate(PAGE_SIZE << compound_order(page));
464 static inline unsigned hstate_index_to_shift(unsigned index)
466 return hstates[index].order + PAGE_SHIFT;
469 static inline int hstate_index(struct hstate *h)
474 extern int dissolve_free_huge_page(struct page *page);
475 extern int dissolve_free_huge_pages(unsigned long start_pfn,
476 unsigned long end_pfn);
477 static inline bool hugepage_migration_supported(struct hstate *h)
479 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
480 if ((huge_page_shift(h) == PMD_SHIFT) ||
481 (huge_page_shift(h) == PGDIR_SHIFT))
490 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
491 struct mm_struct *mm, pte_t *pte)
493 if (huge_page_size(h) == PMD_SIZE)
494 return pmd_lockptr(mm, (pmd_t *) pte);
495 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
496 return &mm->page_table_lock;
499 #ifndef hugepages_supported
501 * Some platform decide whether they support huge pages at boot
502 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
503 * when there is no such support
505 #define hugepages_supported() (HPAGE_SHIFT != 0)
508 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
510 static inline void hugetlb_count_init(struct mm_struct *mm)
512 atomic_long_set(&mm->hugetlb_usage, 0);
515 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
517 atomic_long_add(l, &mm->hugetlb_usage);
520 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
522 atomic_long_sub(l, &mm->hugetlb_usage);
525 #ifndef set_huge_swap_pte_at
526 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
527 pte_t *ptep, pte_t pte, unsigned long sz)
529 set_huge_pte_at(mm, addr, ptep, pte);
533 void set_page_huge_active(struct page *page);
535 #else /* CONFIG_HUGETLB_PAGE */
537 #define alloc_huge_page(v, a, r) NULL
538 #define alloc_huge_page_node(h, nid) NULL
539 #define alloc_huge_page_nodemask(h, preferred_nid, nmask) NULL
540 #define alloc_huge_page_noerr(v, a, r) NULL
541 #define alloc_bootmem_huge_page(h) NULL
542 #define hstate_file(f) NULL
543 #define hstate_sizelog(s) NULL
544 #define hstate_vma(v) NULL
545 #define hstate_inode(i) NULL
546 #define page_hstate(page) NULL
547 #define huge_page_size(h) PAGE_SIZE
548 #define huge_page_mask(h) PAGE_MASK
549 #define vma_kernel_pagesize(v) PAGE_SIZE
550 #define vma_mmu_pagesize(v) PAGE_SIZE
551 #define huge_page_order(h) 0
552 #define huge_page_shift(h) PAGE_SHIFT
553 static inline bool hstate_is_gigantic(struct hstate *h)
558 static inline unsigned int pages_per_huge_page(struct hstate *h)
563 static inline unsigned hstate_index_to_shift(unsigned index)
568 static inline int hstate_index(struct hstate *h)
573 static inline int dissolve_free_huge_page(struct page *page)
578 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
579 unsigned long end_pfn)
584 static inline bool hugepage_migration_supported(struct hstate *h)
589 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
590 struct mm_struct *mm, pte_t *pte)
592 return &mm->page_table_lock;
595 static inline void hugetlb_count_init(struct mm_struct *mm)
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 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
624 static inline bool hugetlb_pmd_shared(pte_t *pte)
626 return page_count(virt_to_page(pte)) > 1;
629 static inline bool hugetlb_pmd_shared(pte_t *pte)
635 #endif /* _LINUX_HUGETLB_H */