1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #include <linux/mm_types.h>
5 #include <linux/mmdebug.h>
7 #include <linux/hugetlb_inline.h>
8 #include <linux/cgroup.h>
9 #include <linux/list.h>
10 #include <linux/kref.h>
11 #include <asm/pgtable.h>
17 #ifdef CONFIG_HUGETLB_PAGE
19 #include <linux/mempolicy.h>
20 #include <linux/shm.h>
21 #include <asm/tlbflush.h>
23 struct hugepage_subpool {
26 long max_hpages; /* Maximum huge pages or -1 if no maximum. */
27 long used_hpages; /* Used count against maximum, includes */
28 /* both alloced and reserved pages. */
29 struct hstate *hstate;
30 long min_hpages; /* Minimum huge pages or -1 if no minimum. */
31 long rsv_hpages; /* Pages reserved against global pool to */
32 /* sasitfy minimum size. */
38 struct list_head regions;
39 long adds_in_progress;
40 struct list_head region_cache;
41 long region_cache_count;
43 extern struct resv_map *resv_map_alloc(void);
44 void resv_map_release(struct kref *ref);
46 extern spinlock_t hugetlb_lock;
47 extern int hugetlb_max_hstate __read_mostly;
48 #define for_each_hstate(h) \
49 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
51 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
53 void hugepage_put_subpool(struct hugepage_subpool *spool);
55 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
56 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
57 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
58 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
61 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
62 void __user *, size_t *, loff_t *);
65 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
66 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
67 struct page **, struct vm_area_struct **,
68 unsigned long *, unsigned long *, long, unsigned int,
70 void unmap_hugepage_range(struct vm_area_struct *,
71 unsigned long, unsigned long, struct page *);
72 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
73 struct vm_area_struct *vma,
74 unsigned long start, unsigned long end,
75 struct page *ref_page);
76 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
77 unsigned long start, unsigned long end,
78 struct page *ref_page);
79 void hugetlb_report_meminfo(struct seq_file *);
80 int hugetlb_report_node_meminfo(int, char *);
81 void hugetlb_show_meminfo(void);
82 unsigned long hugetlb_total_pages(void);
83 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
84 unsigned long address, unsigned int flags);
85 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
86 struct vm_area_struct *dst_vma,
87 unsigned long dst_addr,
88 unsigned long src_addr,
90 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
91 struct vm_area_struct *vma,
93 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
95 int dequeue_hwpoisoned_huge_page(struct page *page);
96 bool isolate_huge_page(struct page *page, struct list_head *list);
97 void putback_active_hugepage(struct page *page);
98 void free_huge_page(struct page *page);
99 void hugetlb_fix_reserve_counts(struct inode *inode);
100 extern struct mutex *hugetlb_fault_mutex_table;
101 u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
102 struct vm_area_struct *vma,
103 struct address_space *mapping,
104 pgoff_t idx, unsigned long address);
106 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
108 extern int hugepages_treat_as_movable;
109 extern int sysctl_hugetlb_shm_group;
110 extern struct list_head huge_boot_pages;
114 pte_t *huge_pte_alloc(struct mm_struct *mm,
115 unsigned long addr, unsigned long sz);
116 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
117 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
118 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
120 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
121 pmd_t *pmd, int flags);
122 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
123 pud_t *pud, int flags);
124 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
125 pgd_t *pgd, int flags);
127 int pmd_huge(pmd_t pmd);
128 int pud_huge(pud_t pud);
129 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
130 unsigned long address, unsigned long end, pgprot_t newprot);
132 bool is_hugetlb_entry_migration(pte_t pte);
133 #else /* !CONFIG_HUGETLB_PAGE */
135 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
139 static inline unsigned long hugetlb_total_pages(void)
144 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
145 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
146 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
147 static inline void hugetlb_report_meminfo(struct seq_file *m)
150 #define hugetlb_report_node_meminfo(n, buf) 0
151 static inline void hugetlb_show_meminfo(void)
154 #define follow_huge_pmd(mm, addr, pmd, flags) NULL
155 #define follow_huge_pud(mm, addr, pud, flags) NULL
156 #define follow_huge_pgd(mm, addr, pgd, flags) NULL
157 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
158 #define pmd_huge(x) 0
159 #define pud_huge(x) 0
160 #define is_hugepage_only_range(mm, addr, len) 0
161 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
162 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
163 #define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
164 src_addr, pagep) ({ BUG(); 0; })
165 #define huge_pte_offset(mm, address) 0
166 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
171 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
175 #define putback_active_hugepage(p) do {} while (0)
177 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
178 unsigned long address, unsigned long end, pgprot_t newprot)
183 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
184 struct vm_area_struct *vma, unsigned long start,
185 unsigned long end, struct page *ref_page)
190 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
191 struct vm_area_struct *vma, unsigned long start,
192 unsigned long end, struct page *ref_page)
197 #endif /* !CONFIG_HUGETLB_PAGE */
199 * hugepages at page global directory. If arch support
200 * hugepages at pgd level, they need to define this.
203 #define pgd_huge(x) 0
206 #define p4d_huge(x) 0
210 static inline int pgd_write(pgd_t pgd)
218 static inline int pud_write(pud_t pud)
227 * Some architectures requires a hugepage directory format that is
228 * required to support multiple hugepage sizes. For example
229 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
230 * introduced the same on powerpc. This allows for a more flexible hugepage
233 typedef struct { unsigned long pd; } hugepd_t;
234 #define is_hugepd(hugepd) (0)
235 #define __hugepd(x) ((hugepd_t) { (x) })
236 static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
237 unsigned pdshift, unsigned long end,
238 int write, struct page **pages, int *nr)
243 extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
244 unsigned pdshift, unsigned long end,
245 int write, struct page **pages, int *nr);
248 #define HUGETLB_ANON_FILE "anon_hugepage"
252 * The file will be used as an shm file so shmfs accounting rules
255 HUGETLB_SHMFS_INODE = 1,
257 * The file is being created on the internal vfs mount and shmfs
258 * accounting rules do not apply
260 HUGETLB_ANONHUGE_INODE = 2,
263 #ifdef CONFIG_HUGETLBFS
264 struct hugetlbfs_sb_info {
265 long max_inodes; /* inodes allowed */
266 long free_inodes; /* inodes free */
267 spinlock_t stat_lock;
268 struct hstate *hstate;
269 struct hugepage_subpool *spool;
272 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
274 return sb->s_fs_info;
277 extern const struct file_operations hugetlbfs_file_operations;
278 extern const struct vm_operations_struct hugetlb_vm_ops;
279 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
280 struct user_struct **user, int creat_flags,
283 static inline bool is_file_hugepages(struct file *file)
285 if (file->f_op == &hugetlbfs_file_operations)
288 return is_file_shm_hugepages(file);
292 #else /* !CONFIG_HUGETLBFS */
294 #define is_file_hugepages(file) false
295 static inline struct file *
296 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
297 struct user_struct **user, int creat_flags,
300 return ERR_PTR(-ENOSYS);
303 #endif /* !CONFIG_HUGETLBFS */
305 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
306 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
307 unsigned long len, unsigned long pgoff,
308 unsigned long flags);
309 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
311 #ifdef CONFIG_HUGETLB_PAGE
313 #define HSTATE_NAME_LEN 32
314 /* Defines one hugetlb page size */
316 int next_nid_to_alloc;
317 int next_nid_to_free;
320 unsigned long max_huge_pages;
321 unsigned long nr_huge_pages;
322 unsigned long free_huge_pages;
323 unsigned long resv_huge_pages;
324 unsigned long surplus_huge_pages;
325 unsigned long nr_overcommit_huge_pages;
326 struct list_head hugepage_activelist;
327 struct list_head hugepage_freelists[MAX_NUMNODES];
328 unsigned int nr_huge_pages_node[MAX_NUMNODES];
329 unsigned int free_huge_pages_node[MAX_NUMNODES];
330 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
331 #ifdef CONFIG_CGROUP_HUGETLB
332 /* cgroup control files */
333 struct cftype cgroup_files[5];
335 char name[HSTATE_NAME_LEN];
338 struct huge_bootmem_page {
339 struct list_head list;
340 struct hstate *hstate;
341 #ifdef CONFIG_HIGHMEM
346 struct page *alloc_huge_page(struct vm_area_struct *vma,
347 unsigned long addr, int avoid_reserve);
348 struct page *alloc_huge_page_node(struct hstate *h, int nid);
349 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
350 unsigned long addr, int avoid_reserve);
351 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
355 int __init alloc_bootmem_huge_page(struct hstate *h);
357 void __init hugetlb_bad_size(void);
358 void __init hugetlb_add_hstate(unsigned order);
359 struct hstate *size_to_hstate(unsigned long size);
361 #ifndef HUGE_MAX_HSTATE
362 #define HUGE_MAX_HSTATE 1
365 extern struct hstate hstates[HUGE_MAX_HSTATE];
366 extern unsigned int default_hstate_idx;
368 #define default_hstate (hstates[default_hstate_idx])
370 static inline struct hstate *hstate_inode(struct inode *i)
372 return HUGETLBFS_SB(i->i_sb)->hstate;
375 static inline struct hstate *hstate_file(struct file *f)
377 return hstate_inode(file_inode(f));
380 static inline struct hstate *hstate_sizelog(int page_size_log)
383 return &default_hstate;
385 return size_to_hstate(1UL << page_size_log);
388 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
390 return hstate_file(vma->vm_file);
393 static inline unsigned long huge_page_size(struct hstate *h)
395 return (unsigned long)PAGE_SIZE << h->order;
398 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
400 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
402 static inline unsigned long huge_page_mask(struct hstate *h)
407 static inline unsigned int huge_page_order(struct hstate *h)
412 static inline unsigned huge_page_shift(struct hstate *h)
414 return h->order + PAGE_SHIFT;
417 static inline bool hstate_is_gigantic(struct hstate *h)
419 return huge_page_order(h) >= MAX_ORDER;
422 static inline unsigned int pages_per_huge_page(struct hstate *h)
424 return 1 << h->order;
427 static inline unsigned int blocks_per_huge_page(struct hstate *h)
429 return huge_page_size(h) / 512;
432 #include <asm/hugetlb.h>
434 #ifndef arch_make_huge_pte
435 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
436 struct page *page, int writable)
442 static inline struct hstate *page_hstate(struct page *page)
444 VM_BUG_ON_PAGE(!PageHuge(page), page);
445 return size_to_hstate(PAGE_SIZE << compound_order(page));
448 static inline unsigned hstate_index_to_shift(unsigned index)
450 return hstates[index].order + PAGE_SHIFT;
453 static inline int hstate_index(struct hstate *h)
458 pgoff_t __basepage_index(struct page *page);
460 /* Return page->index in PAGE_SIZE units */
461 static inline pgoff_t basepage_index(struct page *page)
463 if (!PageCompound(page))
466 return __basepage_index(page);
469 extern int dissolve_free_huge_pages(unsigned long start_pfn,
470 unsigned long end_pfn);
471 static inline bool hugepage_migration_supported(struct hstate *h)
473 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
474 if ((huge_page_shift(h) == PMD_SHIFT) ||
475 (huge_page_shift(h) == PGDIR_SHIFT))
484 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
485 struct mm_struct *mm, pte_t *pte)
487 if (huge_page_size(h) == PMD_SIZE)
488 return pmd_lockptr(mm, (pmd_t *) pte);
489 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
490 return &mm->page_table_lock;
493 #ifndef hugepages_supported
495 * Some platform decide whether they support huge pages at boot
496 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
497 * when there is no such support
499 #define hugepages_supported() (HPAGE_SHIFT != 0)
502 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
504 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
506 atomic_long_add(l, &mm->hugetlb_usage);
509 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
511 atomic_long_sub(l, &mm->hugetlb_usage);
513 #else /* CONFIG_HUGETLB_PAGE */
515 #define alloc_huge_page(v, a, r) NULL
516 #define alloc_huge_page_node(h, nid) NULL
517 #define alloc_huge_page_noerr(v, a, r) NULL
518 #define alloc_bootmem_huge_page(h) NULL
519 #define hstate_file(f) NULL
520 #define hstate_sizelog(s) NULL
521 #define hstate_vma(v) NULL
522 #define hstate_inode(i) NULL
523 #define page_hstate(page) NULL
524 #define huge_page_size(h) PAGE_SIZE
525 #define huge_page_mask(h) PAGE_MASK
526 #define vma_kernel_pagesize(v) PAGE_SIZE
527 #define vma_mmu_pagesize(v) PAGE_SIZE
528 #define huge_page_order(h) 0
529 #define huge_page_shift(h) PAGE_SHIFT
530 static inline bool hstate_is_gigantic(struct hstate *h)
535 static inline unsigned int pages_per_huge_page(struct hstate *h)
539 #define hstate_index_to_shift(index) 0
540 #define hstate_index(h) 0
542 static inline pgoff_t basepage_index(struct page *page)
546 #define dissolve_free_huge_pages(s, e) 0
547 #define hugepage_migration_supported(h) false
549 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
550 struct mm_struct *mm, pte_t *pte)
552 return &mm->page_table_lock;
555 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
559 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
562 #endif /* CONFIG_HUGETLB_PAGE */
564 static inline spinlock_t *huge_pte_lock(struct hstate *h,
565 struct mm_struct *mm, pte_t *pte)
569 ptl = huge_pte_lockptr(h, mm, pte);
574 #endif /* _LINUX_HUGETLB_H */