1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #include <linux/mm_types.h>
6 #include <linux/hugetlb_inline.h>
12 #ifdef CONFIG_HUGETLB_PAGE
14 #include <linux/mempolicy.h>
15 #include <linux/shm.h>
16 #include <asm/tlbflush.h>
18 struct hugepage_subpool {
21 long max_hpages, used_hpages;
24 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
25 void hugepage_put_subpool(struct hugepage_subpool *spool);
27 int PageHuge(struct page *page);
29 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
30 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
31 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
32 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
35 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
36 void __user *, size_t *, loff_t *);
39 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
40 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
41 struct page **, struct vm_area_struct **,
42 unsigned long *, int *, int, unsigned int flags);
43 void unmap_hugepage_range(struct vm_area_struct *,
44 unsigned long, unsigned long, struct page *);
45 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
46 unsigned long start, unsigned long end,
47 struct page *ref_page);
48 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
49 void hugetlb_report_meminfo(struct seq_file *);
50 int hugetlb_report_node_meminfo(int, char *);
51 unsigned long hugetlb_total_pages(void);
52 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
53 unsigned long address, unsigned int flags);
54 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
55 struct vm_area_struct *vma,
57 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
58 int dequeue_hwpoisoned_huge_page(struct page *page);
59 void copy_huge_page(struct page *dst, struct page *src);
61 extern unsigned long hugepages_treat_as_movable;
62 extern const unsigned long hugetlb_zero, hugetlb_infinity;
63 extern int sysctl_hugetlb_shm_group;
64 extern struct list_head huge_boot_pages;
68 pte_t *huge_pte_alloc(struct mm_struct *mm,
69 unsigned long addr, unsigned long sz);
70 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
71 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
72 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
74 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
75 pmd_t *pmd, int write);
76 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
77 pud_t *pud, int write);
78 int pmd_huge(pmd_t pmd);
79 int pud_huge(pud_t pmd);
80 void hugetlb_change_protection(struct vm_area_struct *vma,
81 unsigned long address, unsigned long end, pgprot_t newprot);
83 #else /* !CONFIG_HUGETLB_PAGE */
85 static inline int PageHuge(struct page *page)
90 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
94 static inline unsigned long hugetlb_total_pages(void)
99 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
100 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
101 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
102 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
103 static inline void hugetlb_report_meminfo(struct seq_file *m)
106 #define hugetlb_report_node_meminfo(n, buf) 0
107 #define follow_huge_pmd(mm, addr, pmd, write) NULL
108 #define follow_huge_pud(mm, addr, pud, write) NULL
109 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
110 #define pmd_huge(x) 0
111 #define pud_huge(x) 0
112 #define is_hugepage_only_range(mm, addr, len) 0
113 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
114 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
115 #define huge_pte_offset(mm, address) 0
116 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
121 static inline void copy_huge_page(struct page *dst, struct page *src)
125 #define hugetlb_change_protection(vma, address, end, newprot)
127 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
128 struct vm_area_struct *vma, unsigned long start,
129 unsigned long end, struct page *ref_page)
134 #endif /* !CONFIG_HUGETLB_PAGE */
136 #define HUGETLB_ANON_FILE "anon_hugepage"
140 * The file will be used as an shm file so shmfs accounting rules
143 HUGETLB_SHMFS_INODE = 1,
145 * The file is being created on the internal vfs mount and shmfs
146 * accounting rules do not apply
148 HUGETLB_ANONHUGE_INODE = 2,
151 #ifdef CONFIG_HUGETLBFS
152 struct hugetlbfs_sb_info {
153 long max_inodes; /* inodes allowed */
154 long free_inodes; /* inodes free */
155 spinlock_t stat_lock;
156 struct hstate *hstate;
157 struct hugepage_subpool *spool;
160 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
162 return sb->s_fs_info;
165 extern const struct file_operations hugetlbfs_file_operations;
166 extern const struct vm_operations_struct hugetlb_vm_ops;
167 struct file *hugetlb_file_setup(const char *name, unsigned long addr,
168 size_t size, vm_flags_t acct,
169 struct user_struct **user, int creat_flags);
171 static inline int is_file_hugepages(struct file *file)
173 if (file->f_op == &hugetlbfs_file_operations)
175 if (is_file_shm_hugepages(file))
181 #else /* !CONFIG_HUGETLBFS */
183 #define is_file_hugepages(file) 0
184 static inline struct file *
185 hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
186 vm_flags_t acctflag, struct user_struct **user, int creat_flags)
188 return ERR_PTR(-ENOSYS);
191 #endif /* !CONFIG_HUGETLBFS */
193 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
194 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
195 unsigned long len, unsigned long pgoff,
196 unsigned long flags);
197 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
199 #ifdef CONFIG_HUGETLB_PAGE
201 #define HSTATE_NAME_LEN 32
202 /* Defines one hugetlb page size */
204 int next_nid_to_alloc;
205 int next_nid_to_free;
208 unsigned long max_huge_pages;
209 unsigned long nr_huge_pages;
210 unsigned long free_huge_pages;
211 unsigned long resv_huge_pages;
212 unsigned long surplus_huge_pages;
213 unsigned long nr_overcommit_huge_pages;
214 struct list_head hugepage_freelists[MAX_NUMNODES];
215 unsigned int nr_huge_pages_node[MAX_NUMNODES];
216 unsigned int free_huge_pages_node[MAX_NUMNODES];
217 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
218 char name[HSTATE_NAME_LEN];
221 struct huge_bootmem_page {
222 struct list_head list;
223 struct hstate *hstate;
224 #ifdef CONFIG_HIGHMEM
229 struct page *alloc_huge_page_node(struct hstate *h, int nid);
232 int __init alloc_bootmem_huge_page(struct hstate *h);
234 void __init hugetlb_add_hstate(unsigned order);
235 struct hstate *size_to_hstate(unsigned long size);
237 #ifndef HUGE_MAX_HSTATE
238 #define HUGE_MAX_HSTATE 1
241 extern struct hstate hstates[HUGE_MAX_HSTATE];
242 extern unsigned int default_hstate_idx;
244 #define default_hstate (hstates[default_hstate_idx])
246 static inline struct hstate *hstate_inode(struct inode *i)
248 struct hugetlbfs_sb_info *hsb;
249 hsb = HUGETLBFS_SB(i->i_sb);
253 static inline struct hstate *hstate_file(struct file *f)
255 return hstate_inode(f->f_dentry->d_inode);
258 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
260 return hstate_file(vma->vm_file);
263 static inline unsigned long huge_page_size(struct hstate *h)
265 return (unsigned long)PAGE_SIZE << h->order;
268 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
270 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
272 static inline unsigned long huge_page_mask(struct hstate *h)
277 static inline unsigned int huge_page_order(struct hstate *h)
282 static inline unsigned huge_page_shift(struct hstate *h)
284 return h->order + PAGE_SHIFT;
287 static inline unsigned int pages_per_huge_page(struct hstate *h)
289 return 1 << h->order;
292 static inline unsigned int blocks_per_huge_page(struct hstate *h)
294 return huge_page_size(h) / 512;
297 #include <asm/hugetlb.h>
299 #ifndef arch_make_huge_pte
300 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
301 struct page *page, int writable)
307 static inline struct hstate *page_hstate(struct page *page)
309 return size_to_hstate(PAGE_SIZE << compound_order(page));
312 static inline unsigned hstate_index_to_shift(unsigned index)
314 return hstates[index].order + PAGE_SHIFT;
317 static inline int hstate_index(struct hstate *h)
324 #define alloc_huge_page_node(h, nid) NULL
325 #define alloc_bootmem_huge_page(h) NULL
326 #define hstate_file(f) NULL
327 #define hstate_vma(v) NULL
328 #define hstate_inode(i) NULL
329 #define huge_page_size(h) PAGE_SIZE
330 #define huge_page_mask(h) PAGE_MASK
331 #define vma_kernel_pagesize(v) PAGE_SIZE
332 #define vma_mmu_pagesize(v) PAGE_SIZE
333 #define huge_page_order(h) 0
334 #define huge_page_shift(h) PAGE_SHIFT
335 static inline unsigned int pages_per_huge_page(struct hstate *h)
339 #define hstate_index_to_shift(index) 0
340 #define hstate_index(h) 0
343 #endif /* _LINUX_HUGETLB_H */