1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
6 #ifdef CONFIG_HUGETLB_PAGE
8 #include <linux/mempolicy.h>
10 #include <asm/tlbflush.h>
14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
16 return vma->vm_flags & VM_HUGETLB;
19 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
25 void unmap_hugepage_range(struct vm_area_struct *,
26 unsigned long, unsigned long, struct page *);
27 void __unmap_hugepage_range(struct vm_area_struct *,
28 unsigned long, unsigned long, struct page *);
29 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
30 int hugetlb_report_meminfo(char *);
31 int hugetlb_report_node_meminfo(int, char *);
32 unsigned long hugetlb_total_pages(void);
33 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
34 unsigned long address, int write_access);
35 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
36 struct vm_area_struct *vma);
37 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
39 extern unsigned long hugepages_treat_as_movable;
40 extern const unsigned long hugetlb_zero, hugetlb_infinity;
41 extern int sysctl_hugetlb_shm_group;
45 pte_t *huge_pte_alloc(struct mm_struct *mm,
46 unsigned long addr, unsigned long sz);
47 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
48 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
49 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
51 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
52 pmd_t *pmd, int write);
53 int pmd_huge(pmd_t pmd);
54 void hugetlb_change_protection(struct vm_area_struct *vma,
55 unsigned long address, unsigned long end, pgprot_t newprot);
57 #else /* !CONFIG_HUGETLB_PAGE */
59 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
64 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
68 static inline unsigned long hugetlb_total_pages(void)
73 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
74 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
75 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
76 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
77 #define unmap_hugepage_range(vma, start, end, page) BUG()
78 #define hugetlb_report_meminfo(buf) 0
79 #define hugetlb_report_node_meminfo(n, buf) 0
80 #define follow_huge_pmd(mm, addr, pmd, write) NULL
81 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
83 #define is_hugepage_only_range(mm, addr, len) 0
84 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
85 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
87 #define hugetlb_change_protection(vma, address, end, newprot)
90 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
91 #define HPAGE_SIZE PAGE_SIZE
94 #endif /* !CONFIG_HUGETLB_PAGE */
96 #ifdef CONFIG_HUGETLBFS
97 struct hugetlbfs_config {
105 struct hugetlbfs_sb_info {
106 long max_blocks; /* blocks allowed */
107 long free_blocks; /* blocks free */
108 long max_inodes; /* inodes allowed */
109 long free_inodes; /* inodes free */
110 spinlock_t stat_lock;
114 struct hugetlbfs_inode_info {
115 struct shared_policy policy;
116 struct inode vfs_inode;
119 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
121 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
124 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
126 return sb->s_fs_info;
129 extern const struct file_operations hugetlbfs_file_operations;
130 extern struct vm_operations_struct hugetlb_vm_ops;
131 struct file *hugetlb_file_setup(const char *name, size_t);
132 int hugetlb_get_quota(struct address_space *mapping, long delta);
133 void hugetlb_put_quota(struct address_space *mapping, long delta);
135 static inline int is_file_hugepages(struct file *file)
137 if (file->f_op == &hugetlbfs_file_operations)
139 if (is_file_shm_hugepages(file))
145 static inline void set_file_hugepages(struct file *file)
147 file->f_op = &hugetlbfs_file_operations;
149 #else /* !CONFIG_HUGETLBFS */
151 #define is_file_hugepages(file) 0
152 #define set_file_hugepages(file) BUG()
153 #define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
155 #endif /* !CONFIG_HUGETLBFS */
157 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
158 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
159 unsigned long len, unsigned long pgoff,
160 unsigned long flags);
161 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
163 #ifdef CONFIG_HUGETLB_PAGE
165 /* Defines one hugetlb page size */
167 int hugetlb_next_nid;
170 unsigned long max_huge_pages;
171 unsigned long nr_huge_pages;
172 unsigned long free_huge_pages;
173 unsigned long resv_huge_pages;
174 unsigned long surplus_huge_pages;
175 unsigned long nr_overcommit_huge_pages;
176 struct list_head hugepage_freelists[MAX_NUMNODES];
177 unsigned int nr_huge_pages_node[MAX_NUMNODES];
178 unsigned int free_huge_pages_node[MAX_NUMNODES];
179 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
182 void __init hugetlb_add_hstate(unsigned order);
183 struct hstate *size_to_hstate(unsigned long size);
185 #ifndef HUGE_MAX_HSTATE
186 #define HUGE_MAX_HSTATE 1
189 extern struct hstate hstates[HUGE_MAX_HSTATE];
190 extern unsigned int default_hstate_idx;
192 #define default_hstate (hstates[default_hstate_idx])
194 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
196 return &default_hstate;
199 static inline struct hstate *hstate_file(struct file *f)
201 return &default_hstate;
204 static inline struct hstate *hstate_inode(struct inode *i)
206 return &default_hstate;
209 static inline unsigned long huge_page_size(struct hstate *h)
211 return (unsigned long)PAGE_SIZE << h->order;
214 static inline unsigned long huge_page_mask(struct hstate *h)
219 static inline unsigned int huge_page_order(struct hstate *h)
224 static inline unsigned huge_page_shift(struct hstate *h)
226 return h->order + PAGE_SHIFT;
229 static inline unsigned int pages_per_huge_page(struct hstate *h)
231 return 1 << h->order;
234 static inline unsigned int blocks_per_huge_page(struct hstate *h)
236 return huge_page_size(h) / 512;
239 #include <asm/hugetlb.h>
241 static inline struct hstate *page_hstate(struct page *page)
243 return size_to_hstate(PAGE_SIZE << compound_order(page));
248 #define hstate_file(f) NULL
249 #define hstate_vma(v) NULL
250 #define hstate_inode(i) NULL
251 #define huge_page_size(h) PAGE_SIZE
252 #define huge_page_mask(h) PAGE_MASK
253 #define huge_page_order(h) 0
254 #define huge_page_shift(h) PAGE_SHIFT
255 #define pages_per_huge_page(h) 1
258 #endif /* _LINUX_HUGETLB_H */