hugetlb: modular state for hugetlb page size
[safe/jmp/linux-2.6] / include / linux / hugetlb.h
1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
3
4 #include <linux/fs.h>
5
6 #ifdef CONFIG_HUGETLB_PAGE
7
8 #include <linux/mempolicy.h>
9 #include <linux/shm.h>
10 #include <asm/tlbflush.h>
11
12 struct ctl_table;
13
14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
15 {
16         return vma->vm_flags & VM_HUGETLB;
17 }
18
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);
38
39 extern unsigned long max_huge_pages;
40 extern unsigned long sysctl_overcommit_huge_pages;
41 extern unsigned long hugepages_treat_as_movable;
42 extern const unsigned long hugetlb_zero, hugetlb_infinity;
43 extern int sysctl_hugetlb_shm_group;
44
45 /* arch callbacks */
46
47 pte_t *huge_pte_alloc(struct mm_struct *mm,
48                         unsigned long addr, unsigned long sz);
49 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
50 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
51 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
52                               int write);
53 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
54                                 pmd_t *pmd, int write);
55 int pmd_huge(pmd_t pmd);
56 void hugetlb_change_protection(struct vm_area_struct *vma,
57                 unsigned long address, unsigned long end, pgprot_t newprot);
58
59 #else /* !CONFIG_HUGETLB_PAGE */
60
61 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
62 {
63         return 0;
64 }
65
66 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
67 {
68 }
69
70 static inline unsigned long hugetlb_total_pages(void)
71 {
72         return 0;
73 }
74
75 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
76 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
77 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
78 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
79 #define unmap_hugepage_range(vma, start, end, page)     BUG()
80 #define hugetlb_report_meminfo(buf)             0
81 #define hugetlb_report_node_meminfo(n, buf)     0
82 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
83 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
84 #define pmd_huge(x)     0
85 #define is_hugepage_only_range(mm, addr, len)   0
86 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
87 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
88
89 #define hugetlb_change_protection(vma, address, end, newprot)
90
91 #ifndef HPAGE_MASK
92 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
93 #define HPAGE_SIZE      PAGE_SIZE
94 #endif
95
96 #endif /* !CONFIG_HUGETLB_PAGE */
97
98 #ifdef CONFIG_HUGETLBFS
99 struct hugetlbfs_config {
100         uid_t   uid;
101         gid_t   gid;
102         umode_t mode;
103         long    nr_blocks;
104         long    nr_inodes;
105 };
106
107 struct hugetlbfs_sb_info {
108         long    max_blocks;   /* blocks allowed */
109         long    free_blocks;  /* blocks free */
110         long    max_inodes;   /* inodes allowed */
111         long    free_inodes;  /* inodes free */
112         spinlock_t      stat_lock;
113 };
114
115
116 struct hugetlbfs_inode_info {
117         struct shared_policy policy;
118         struct inode vfs_inode;
119 };
120
121 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
122 {
123         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
124 }
125
126 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
127 {
128         return sb->s_fs_info;
129 }
130
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);
136
137 static inline int is_file_hugepages(struct file *file)
138 {
139         if (file->f_op == &hugetlbfs_file_operations)
140                 return 1;
141         if (is_file_shm_hugepages(file))
142                 return 1;
143
144         return 0;
145 }
146
147 static inline void set_file_hugepages(struct file *file)
148 {
149         file->f_op = &hugetlbfs_file_operations;
150 }
151 #else /* !CONFIG_HUGETLBFS */
152
153 #define is_file_hugepages(file)         0
154 #define set_file_hugepages(file)        BUG()
155 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
156
157 #endif /* !CONFIG_HUGETLBFS */
158
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 */
164
165 #ifdef CONFIG_HUGETLB_PAGE
166
167 /* Defines one hugetlb page size */
168 struct hstate {
169         int hugetlb_next_nid;
170         unsigned int order;
171         unsigned long mask;
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];
182 };
183
184 extern struct hstate default_hstate;
185
186 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
187 {
188         return &default_hstate;
189 }
190
191 static inline struct hstate *hstate_file(struct file *f)
192 {
193         return &default_hstate;
194 }
195
196 static inline struct hstate *hstate_inode(struct inode *i)
197 {
198         return &default_hstate;
199 }
200
201 static inline unsigned long huge_page_size(struct hstate *h)
202 {
203         return (unsigned long)PAGE_SIZE << h->order;
204 }
205
206 static inline unsigned long huge_page_mask(struct hstate *h)
207 {
208         return h->mask;
209 }
210
211 static inline unsigned int huge_page_order(struct hstate *h)
212 {
213         return h->order;
214 }
215
216 static inline unsigned huge_page_shift(struct hstate *h)
217 {
218         return h->order + PAGE_SHIFT;
219 }
220
221 static inline unsigned int pages_per_huge_page(struct hstate *h)
222 {
223         return 1 << h->order;
224 }
225
226 static inline unsigned int blocks_per_huge_page(struct hstate *h)
227 {
228         return huge_page_size(h) / 512;
229 }
230
231 #include <asm/hugetlb.h>
232
233 #else
234 struct hstate {};
235 #define hstate_file(f) NULL
236 #define hstate_vma(v) NULL
237 #define hstate_inode(i) NULL
238 #define huge_page_size(h) PAGE_SIZE
239 #define huge_page_mask(h) PAGE_MASK
240 #define huge_page_order(h) 0
241 #define huge_page_shift(h) PAGE_SHIFT
242 #define pages_per_huge_page(h) 1
243 #endif
244
245 #endif /* _LINUX_HUGETLB_H */