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
{
103 struct hstate
*hstate
;
106 struct hugetlbfs_sb_info
{
107 long max_blocks
; /* blocks allowed */
108 long free_blocks
; /* blocks free */
109 long max_inodes
; /* inodes allowed */
110 long free_inodes
; /* inodes free */
111 spinlock_t stat_lock
;
112 struct hstate
*hstate
;
116 struct hugetlbfs_inode_info
{
117 struct shared_policy policy
;
118 struct inode vfs_inode
;
121 static inline struct hugetlbfs_inode_info
*HUGETLBFS_I(struct inode
*inode
)
123 return container_of(inode
, struct hugetlbfs_inode_info
, vfs_inode
);
126 static inline struct hugetlbfs_sb_info
*HUGETLBFS_SB(struct super_block
*sb
)
128 return sb
->s_fs_info
;
131 extern const struct file_operations hugetlbfs_file_operations
;
132 extern struct vm_operations_struct hugetlb_vm_ops
;
133 struct file
*hugetlb_file_setup(const char *name
, size_t);
134 int hugetlb_get_quota(struct address_space
*mapping
, long delta
);
135 void hugetlb_put_quota(struct address_space
*mapping
, long delta
);
137 static inline int is_file_hugepages(struct file
*file
)
139 if (file
->f_op
== &hugetlbfs_file_operations
)
141 if (is_file_shm_hugepages(file
))
147 static inline void set_file_hugepages(struct file
*file
)
149 file
->f_op
= &hugetlbfs_file_operations
;
151 #else /* !CONFIG_HUGETLBFS */
153 #define is_file_hugepages(file) 0
154 #define set_file_hugepages(file) BUG()
155 #define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
157 #endif /* !CONFIG_HUGETLBFS */
159 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
160 unsigned long hugetlb_get_unmapped_area(struct file
*file
, unsigned long addr
,
161 unsigned long len
, unsigned long pgoff
,
162 unsigned long flags
);
163 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
165 #ifdef CONFIG_HUGETLB_PAGE
167 /* Defines one hugetlb page size */
169 int hugetlb_next_nid
;
172 unsigned long max_huge_pages
;
173 unsigned long nr_huge_pages
;
174 unsigned long free_huge_pages
;
175 unsigned long resv_huge_pages
;
176 unsigned long surplus_huge_pages
;
177 unsigned long nr_overcommit_huge_pages
;
178 struct list_head hugepage_freelists
[MAX_NUMNODES
];
179 unsigned int nr_huge_pages_node
[MAX_NUMNODES
];
180 unsigned int free_huge_pages_node
[MAX_NUMNODES
];
181 unsigned int surplus_huge_pages_node
[MAX_NUMNODES
];
184 void __init
hugetlb_add_hstate(unsigned order
);
185 struct hstate
*size_to_hstate(unsigned long size
);
187 #ifndef HUGE_MAX_HSTATE
188 #define HUGE_MAX_HSTATE 1
191 extern struct hstate hstates
[HUGE_MAX_HSTATE
];
192 extern unsigned int default_hstate_idx
;
194 #define default_hstate (hstates[default_hstate_idx])
196 static inline struct hstate
*hstate_inode(struct inode
*i
)
198 struct hugetlbfs_sb_info
*hsb
;
199 hsb
= HUGETLBFS_SB(i
->i_sb
);
203 static inline struct hstate
*hstate_file(struct file
*f
)
205 return hstate_inode(f
->f_dentry
->d_inode
);
208 static inline struct hstate
*hstate_vma(struct vm_area_struct
*vma
)
210 return hstate_file(vma
->vm_file
);
213 static inline unsigned long huge_page_size(struct hstate
*h
)
215 return (unsigned long)PAGE_SIZE
<< h
->order
;
218 static inline unsigned long huge_page_mask(struct hstate
*h
)
223 static inline unsigned int huge_page_order(struct hstate
*h
)
228 static inline unsigned huge_page_shift(struct hstate
*h
)
230 return h
->order
+ PAGE_SHIFT
;
233 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
235 return 1 << h
->order
;
238 static inline unsigned int blocks_per_huge_page(struct hstate
*h
)
240 return huge_page_size(h
) / 512;
243 #include <asm/hugetlb.h>
245 static inline struct hstate
*page_hstate(struct page
*page
)
247 return size_to_hstate(PAGE_SIZE
<< compound_order(page
));
252 #define hstate_file(f) NULL
253 #define hstate_vma(v) NULL
254 #define hstate_inode(i) NULL
255 #define huge_page_size(h) PAGE_SIZE
256 #define huge_page_mask(h) PAGE_MASK
257 #define huge_page_order(h) 0
258 #define huge_page_shift(h) PAGE_SHIFT
259 #define pages_per_huge_page(h) 1
262 #endif /* _LINUX_HUGETLB_H */