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 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
87 int dequeue_hwpoisoned_huge_page(struct page *page);
88 bool isolate_huge_page(struct page *page, struct list_head *list);
89 void putback_active_hugepage(struct page *page);
90 void free_huge_page(struct page *page);
92 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
93 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
96 extern int hugepages_treat_as_movable;
97 extern int sysctl_hugetlb_shm_group;
98 extern struct list_head huge_boot_pages;
102 pte_t *huge_pte_alloc(struct mm_struct *mm,
103 unsigned long addr, unsigned long sz);
104 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
105 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
106 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
108 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
109 pmd_t *pmd, int flags);
110 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
111 pud_t *pud, int flags);
112 int pmd_huge(pmd_t pmd);
113 int pud_huge(pud_t pmd);
114 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
115 unsigned long address, unsigned long end, pgprot_t newprot);
117 #else /* !CONFIG_HUGETLB_PAGE */
119 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
123 static inline unsigned long hugetlb_total_pages(void)
128 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
129 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
130 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
131 static inline void hugetlb_report_meminfo(struct seq_file *m)
134 #define hugetlb_report_node_meminfo(n, buf) 0
135 static inline void hugetlb_show_meminfo(void)
138 #define follow_huge_pmd(mm, addr, pmd, flags) NULL
139 #define follow_huge_pud(mm, addr, pud, flags) NULL
140 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
141 #define pmd_huge(x) 0
142 #define pud_huge(x) 0
143 #define is_hugepage_only_range(mm, addr, len) 0
144 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
145 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
146 #define huge_pte_offset(mm, address) 0
147 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
152 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
156 #define putback_active_hugepage(p) do {} while (0)
158 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
159 unsigned long address, unsigned long end, pgprot_t newprot)
164 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
165 struct vm_area_struct *vma, unsigned long start,
166 unsigned long end, struct page *ref_page)
171 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
172 struct vm_area_struct *vma, unsigned long start,
173 unsigned long end, struct page *ref_page)
178 #endif /* !CONFIG_HUGETLB_PAGE */
180 * hugepages at page global directory. If arch support
181 * hugepages at pgd level, they need to define this.
184 #define pgd_huge(x) 0
188 static inline int pgd_write(pgd_t pgd)
196 static inline int pud_write(pud_t pud)
205 * Some architectures requires a hugepage directory format that is
206 * required to support multiple hugepage sizes. For example
207 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
208 * introduced the same on powerpc. This allows for a more flexible hugepage
211 typedef struct { unsigned long pd; } hugepd_t;
212 #define is_hugepd(hugepd) (0)
213 #define __hugepd(x) ((hugepd_t) { (x) })
214 static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
215 unsigned pdshift, unsigned long end,
216 int write, struct page **pages, int *nr)
221 extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
222 unsigned pdshift, unsigned long end,
223 int write, struct page **pages, int *nr);
226 #define HUGETLB_ANON_FILE "anon_hugepage"
230 * The file will be used as an shm file so shmfs accounting rules
233 HUGETLB_SHMFS_INODE = 1,
235 * The file is being created on the internal vfs mount and shmfs
236 * accounting rules do not apply
238 HUGETLB_ANONHUGE_INODE = 2,
241 #ifdef CONFIG_HUGETLBFS
242 struct hugetlbfs_sb_info {
243 long max_inodes; /* inodes allowed */
244 long free_inodes; /* inodes free */
245 spinlock_t stat_lock;
246 struct hstate *hstate;
247 struct hugepage_subpool *spool;
250 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
252 return sb->s_fs_info;
255 extern const struct file_operations hugetlbfs_file_operations;
256 extern const struct vm_operations_struct hugetlb_vm_ops;
257 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
258 struct user_struct **user, int creat_flags,
261 static inline int is_file_hugepages(struct file *file)
263 if (file->f_op == &hugetlbfs_file_operations)
265 if (is_file_shm_hugepages(file))
272 #else /* !CONFIG_HUGETLBFS */
274 #define is_file_hugepages(file) 0
275 static inline struct file *
276 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
277 struct user_struct **user, int creat_flags,
280 return ERR_PTR(-ENOSYS);
283 #endif /* !CONFIG_HUGETLBFS */
285 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
286 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
287 unsigned long len, unsigned long pgoff,
288 unsigned long flags);
289 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
291 #ifdef CONFIG_HUGETLB_PAGE
293 #define HSTATE_NAME_LEN 32
294 /* Defines one hugetlb page size */
296 int next_nid_to_alloc;
297 int next_nid_to_free;
300 unsigned long max_huge_pages;
301 unsigned long nr_huge_pages;
302 unsigned long free_huge_pages;
303 unsigned long resv_huge_pages;
304 unsigned long surplus_huge_pages;
305 unsigned long nr_overcommit_huge_pages;
306 struct list_head hugepage_activelist;
307 struct list_head hugepage_freelists[MAX_NUMNODES];
308 unsigned int nr_huge_pages_node[MAX_NUMNODES];
309 unsigned int free_huge_pages_node[MAX_NUMNODES];
310 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
311 #ifdef CONFIG_CGROUP_HUGETLB
312 /* cgroup control files */
313 struct cftype cgroup_files[5];
315 char name[HSTATE_NAME_LEN];
318 struct huge_bootmem_page {
319 struct list_head list;
320 struct hstate *hstate;
321 #ifdef CONFIG_HIGHMEM
326 struct page *alloc_huge_page_node(struct hstate *h, int nid);
327 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
328 unsigned long addr, int avoid_reserve);
331 int __init alloc_bootmem_huge_page(struct hstate *h);
333 void __init hugetlb_add_hstate(unsigned order);
334 struct hstate *size_to_hstate(unsigned long size);
336 #ifndef HUGE_MAX_HSTATE
337 #define HUGE_MAX_HSTATE 1
340 extern struct hstate hstates[HUGE_MAX_HSTATE];
341 extern unsigned int default_hstate_idx;
343 #define default_hstate (hstates[default_hstate_idx])
345 static inline struct hstate *hstate_inode(struct inode *i)
347 struct hugetlbfs_sb_info *hsb;
348 hsb = HUGETLBFS_SB(i->i_sb);
352 static inline struct hstate *hstate_file(struct file *f)
354 return hstate_inode(file_inode(f));
357 static inline struct hstate *hstate_sizelog(int page_size_log)
360 return &default_hstate;
362 return size_to_hstate(1UL << page_size_log);
365 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
367 return hstate_file(vma->vm_file);
370 static inline unsigned long huge_page_size(struct hstate *h)
372 return (unsigned long)PAGE_SIZE << h->order;
375 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
377 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
379 static inline unsigned long huge_page_mask(struct hstate *h)
384 static inline unsigned int huge_page_order(struct hstate *h)
389 static inline unsigned huge_page_shift(struct hstate *h)
391 return h->order + PAGE_SHIFT;
394 static inline bool hstate_is_gigantic(struct hstate *h)
396 return huge_page_order(h) >= MAX_ORDER;
399 static inline unsigned int pages_per_huge_page(struct hstate *h)
401 return 1 << h->order;
404 static inline unsigned int blocks_per_huge_page(struct hstate *h)
406 return huge_page_size(h) / 512;
409 #include <asm/hugetlb.h>
411 #ifndef arch_make_huge_pte
412 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
413 struct page *page, int writable)
419 static inline struct hstate *page_hstate(struct page *page)
421 VM_BUG_ON_PAGE(!PageHuge(page), page);
422 return size_to_hstate(PAGE_SIZE << compound_order(page));
425 static inline unsigned hstate_index_to_shift(unsigned index)
427 return hstates[index].order + PAGE_SHIFT;
430 static inline int hstate_index(struct hstate *h)
435 pgoff_t __basepage_index(struct page *page);
437 /* Return page->index in PAGE_SIZE units */
438 static inline pgoff_t basepage_index(struct page *page)
440 if (!PageCompound(page))
443 return __basepage_index(page);
446 extern void dissolve_free_huge_pages(unsigned long start_pfn,
447 unsigned long end_pfn);
448 static inline int hugepage_migration_supported(struct hstate *h)
450 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
451 return huge_page_shift(h) == PMD_SHIFT;
457 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
458 struct mm_struct *mm, pte_t *pte)
460 if (huge_page_size(h) == PMD_SIZE)
461 return pmd_lockptr(mm, (pmd_t *) pte);
462 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
463 return &mm->page_table_lock;
466 #ifndef hugepages_supported
468 * Some platform decide whether they support huge pages at boot
469 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
470 * when there is no such support
472 #define hugepages_supported() (HPAGE_SHIFT != 0)
475 #else /* CONFIG_HUGETLB_PAGE */
477 #define alloc_huge_page_node(h, nid) NULL
478 #define alloc_huge_page_noerr(v, a, r) NULL
479 #define alloc_bootmem_huge_page(h) NULL
480 #define hstate_file(f) NULL
481 #define hstate_sizelog(s) NULL
482 #define hstate_vma(v) NULL
483 #define hstate_inode(i) NULL
484 #define page_hstate(page) NULL
485 #define huge_page_size(h) PAGE_SIZE
486 #define huge_page_mask(h) PAGE_MASK
487 #define vma_kernel_pagesize(v) PAGE_SIZE
488 #define vma_mmu_pagesize(v) PAGE_SIZE
489 #define huge_page_order(h) 0
490 #define huge_page_shift(h) PAGE_SHIFT
491 static inline unsigned int pages_per_huge_page(struct hstate *h)
495 #define hstate_index_to_shift(index) 0
496 #define hstate_index(h) 0
498 static inline pgoff_t basepage_index(struct page *page)
502 #define dissolve_free_huge_pages(s, e) do {} while (0)
503 #define hugepage_migration_supported(h) 0
505 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
506 struct mm_struct *mm, pte_t *pte)
508 return &mm->page_table_lock;
510 #endif /* CONFIG_HUGETLB_PAGE */
512 static inline spinlock_t *huge_pte_lock(struct hstate *h,
513 struct mm_struct *mm, pte_t *pte)
517 ptl = huge_pte_lockptr(h, mm, pte);
522 #endif /* _LINUX_HUGETLB_H */