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>
16 #ifdef CONFIG_HUGETLB_PAGE
18 #include <linux/mempolicy.h>
19 #include <linux/shm.h>
20 #include <asm/tlbflush.h>
22 struct hugepage_subpool {
25 long max_hpages; /* Maximum huge pages or -1 if no maximum. */
26 long used_hpages; /* Used count against maximum, includes */
27 /* both alloced and reserved pages. */
28 struct hstate *hstate;
29 long min_hpages; /* Minimum huge pages or -1 if no minimum. */
30 long rsv_hpages; /* Pages reserved against global pool to */
31 /* sasitfy minimum size. */
37 struct list_head regions;
38 long adds_in_progress;
39 struct list_head region_cache;
40 long region_cache_count;
42 extern struct resv_map *resv_map_alloc(void);
43 void resv_map_release(struct kref *ref);
45 extern spinlock_t hugetlb_lock;
46 extern int hugetlb_max_hstate __read_mostly;
47 #define for_each_hstate(h) \
48 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
50 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
52 void hugepage_put_subpool(struct hugepage_subpool *spool);
54 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
55 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
56 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
57 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
60 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
61 void __user *, size_t *, loff_t *);
64 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
65 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
66 struct page **, struct vm_area_struct **,
67 unsigned long *, unsigned long *, long, unsigned int);
68 void unmap_hugepage_range(struct vm_area_struct *,
69 unsigned long, unsigned long, struct page *);
70 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
71 struct vm_area_struct *vma,
72 unsigned long start, unsigned long end,
73 struct page *ref_page);
74 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
75 unsigned long start, unsigned long end,
76 struct page *ref_page);
77 void hugetlb_report_meminfo(struct seq_file *);
78 int hugetlb_report_node_meminfo(int, char *);
79 void hugetlb_show_meminfo(void);
80 unsigned long hugetlb_total_pages(void);
81 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
82 unsigned long address, unsigned int flags);
83 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
84 struct vm_area_struct *vma,
86 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
88 int dequeue_hwpoisoned_huge_page(struct page *page);
89 bool isolate_huge_page(struct page *page, struct list_head *list);
90 void putback_active_hugepage(struct page *page);
91 void free_huge_page(struct page *page);
92 void hugetlb_fix_reserve_counts(struct inode *inode, bool restore_reserve);
93 extern struct mutex *hugetlb_fault_mutex_table;
94 u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
97 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
98 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
101 extern int hugepages_treat_as_movable;
102 extern int sysctl_hugetlb_shm_group;
103 extern struct list_head huge_boot_pages;
107 pte_t *huge_pte_alloc(struct mm_struct *mm,
108 unsigned long addr, unsigned long sz);
109 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
110 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
111 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
112 unsigned long *start, unsigned long *end);
113 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
115 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
116 pmd_t *pmd, int flags);
117 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
118 pud_t *pud, int flags);
119 int pmd_huge(pmd_t pmd);
120 int pud_huge(pud_t pmd);
121 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
122 unsigned long address, unsigned long end, pgprot_t newprot);
124 #else /* !CONFIG_HUGETLB_PAGE */
126 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
130 static inline unsigned long hugetlb_total_pages(void)
135 static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
141 static inline void adjust_range_if_pmd_sharing_possible(
142 struct vm_area_struct *vma,
143 unsigned long *start, unsigned long *end)
147 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
148 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
149 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
150 static inline void hugetlb_report_meminfo(struct seq_file *m)
153 #define hugetlb_report_node_meminfo(n, buf) 0
154 static inline void hugetlb_show_meminfo(void)
157 #define follow_huge_pmd(mm, addr, pmd, flags) NULL
158 #define follow_huge_pud(mm, addr, pud, flags) NULL
159 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
160 #define pmd_huge(x) 0
161 #define pud_huge(x) 0
162 #define is_hugepage_only_range(mm, addr, len) 0
163 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
164 #define hugetlb_fault(mm, vma, addr, flags) ({ 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
207 static inline int pgd_write(pgd_t pgd)
215 static inline int pud_write(pud_t pud)
224 * Some architectures requires a hugepage directory format that is
225 * required to support multiple hugepage sizes. For example
226 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
227 * introduced the same on powerpc. This allows for a more flexible hugepage
230 typedef struct { unsigned long pd; } hugepd_t;
231 #define is_hugepd(hugepd) (0)
232 #define __hugepd(x) ((hugepd_t) { (x) })
233 static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
234 unsigned pdshift, unsigned long end,
235 int write, struct page **pages, int *nr)
240 extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
241 unsigned pdshift, unsigned long end,
242 int write, struct page **pages, int *nr);
245 #define HUGETLB_ANON_FILE "anon_hugepage"
249 * The file will be used as an shm file so shmfs accounting rules
252 HUGETLB_SHMFS_INODE = 1,
254 * The file is being created on the internal vfs mount and shmfs
255 * accounting rules do not apply
257 HUGETLB_ANONHUGE_INODE = 2,
260 #ifdef CONFIG_HUGETLBFS
261 struct hugetlbfs_sb_info {
262 long max_inodes; /* inodes allowed */
263 long free_inodes; /* inodes free */
264 spinlock_t stat_lock;
265 struct hstate *hstate;
266 struct hugepage_subpool *spool;
269 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
271 return sb->s_fs_info;
274 extern const struct file_operations hugetlbfs_file_operations;
275 extern const struct vm_operations_struct hugetlb_vm_ops;
276 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
277 struct user_struct **user, int creat_flags,
280 static inline int is_file_hugepages(struct file *file)
282 if (file->f_op == &hugetlbfs_file_operations)
284 if (is_file_shm_hugepages(file))
291 #else /* !CONFIG_HUGETLBFS */
293 #define is_file_hugepages(file) 0
294 static inline struct file *
295 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
296 struct user_struct **user, int creat_flags,
299 return ERR_PTR(-ENOSYS);
302 #endif /* !CONFIG_HUGETLBFS */
304 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
305 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
306 unsigned long len, unsigned long pgoff,
307 unsigned long flags);
308 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
310 #ifdef CONFIG_HUGETLB_PAGE
312 #define HSTATE_NAME_LEN 32
313 /* Defines one hugetlb page size */
315 int next_nid_to_alloc;
316 int next_nid_to_free;
319 unsigned long max_huge_pages;
320 unsigned long nr_huge_pages;
321 unsigned long free_huge_pages;
322 unsigned long resv_huge_pages;
323 unsigned long surplus_huge_pages;
324 unsigned long nr_overcommit_huge_pages;
325 struct list_head hugepage_activelist;
326 struct list_head hugepage_freelists[MAX_NUMNODES];
327 unsigned int nr_huge_pages_node[MAX_NUMNODES];
328 unsigned int free_huge_pages_node[MAX_NUMNODES];
329 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
330 #ifdef CONFIG_CGROUP_HUGETLB
331 /* cgroup control files */
332 struct cftype cgroup_files[5];
334 char name[HSTATE_NAME_LEN];
337 struct huge_bootmem_page {
338 struct list_head list;
339 struct hstate *hstate;
340 #ifdef CONFIG_HIGHMEM
345 struct page *alloc_huge_page(struct vm_area_struct *vma,
346 unsigned long addr, int avoid_reserve);
347 struct page *alloc_huge_page_node(struct hstate *h, int nid);
348 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
349 unsigned long addr, int avoid_reserve);
350 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
354 int __init alloc_bootmem_huge_page(struct hstate *h);
356 void __init hugetlb_add_hstate(unsigned order);
357 struct hstate *size_to_hstate(unsigned long size);
359 #ifndef HUGE_MAX_HSTATE
360 #define HUGE_MAX_HSTATE 1
363 extern struct hstate hstates[HUGE_MAX_HSTATE];
364 extern unsigned int default_hstate_idx;
366 #define default_hstate (hstates[default_hstate_idx])
368 static inline struct hstate *hstate_inode(struct inode *i)
370 struct hugetlbfs_sb_info *hsb;
371 hsb = HUGETLBFS_SB(i->i_sb);
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 void dissolve_free_huge_pages(unsigned long start_pfn,
470 unsigned long end_pfn);
471 static inline int hugepage_migration_supported(struct hstate *h)
473 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
474 return huge_page_shift(h) == PMD_SHIFT;
480 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
481 struct mm_struct *mm, pte_t *pte)
483 if (huge_page_size(h) == PMD_SIZE)
484 return pmd_lockptr(mm, (pmd_t *) pte);
485 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
486 return &mm->page_table_lock;
489 #ifndef hugepages_supported
491 * Some platform decide whether they support huge pages at boot
492 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
493 * when there is no such support
495 #define hugepages_supported() (HPAGE_SHIFT != 0)
498 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
500 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
502 atomic_long_add(l, &mm->hugetlb_usage);
505 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
507 atomic_long_sub(l, &mm->hugetlb_usage);
510 void set_page_huge_active(struct page *page);
512 #else /* CONFIG_HUGETLB_PAGE */
514 #define alloc_huge_page(v, a, r) NULL
515 #define alloc_huge_page_node(h, nid) NULL
516 #define alloc_huge_page_noerr(v, a, r) NULL
517 #define alloc_bootmem_huge_page(h) NULL
518 #define hstate_file(f) NULL
519 #define hstate_sizelog(s) NULL
520 #define hstate_vma(v) NULL
521 #define hstate_inode(i) NULL
522 #define page_hstate(page) NULL
523 #define huge_page_size(h) PAGE_SIZE
524 #define huge_page_mask(h) PAGE_MASK
525 #define vma_kernel_pagesize(v) PAGE_SIZE
526 #define vma_mmu_pagesize(v) PAGE_SIZE
527 #define huge_page_order(h) 0
528 #define huge_page_shift(h) PAGE_SHIFT
529 static inline unsigned int pages_per_huge_page(struct hstate *h)
533 #define hstate_index_to_shift(index) 0
534 #define hstate_index(h) 0
536 static inline pgoff_t basepage_index(struct page *page)
540 #define dissolve_free_huge_pages(s, e) do {} while (0)
541 #define hugepage_migration_supported(h) 0
543 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
544 struct mm_struct *mm, pte_t *pte)
546 return &mm->page_table_lock;
549 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
553 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
556 #endif /* CONFIG_HUGETLB_PAGE */
558 static inline spinlock_t *huge_pte_lock(struct hstate *h,
559 struct mm_struct *mm, pte_t *pte)
563 ptl = huge_pte_lockptr(h, mm, pte);
568 #endif /* _LINUX_HUGETLB_H */