Merge commit 'v2.6.27-rc7' into x86/pebs
[sfrench/cifs-2.6.git] / 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 hugepages_treat_as_movable;
40 extern const unsigned long hugetlb_zero, hugetlb_infinity;
41 extern int sysctl_hugetlb_shm_group;
42 extern struct list_head huge_boot_pages;
43
44 /* arch callbacks */
45
46 pte_t *huge_pte_alloc(struct mm_struct *mm,
47                         unsigned long addr, unsigned long sz);
48 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
49 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
50 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
51                               int write);
52 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
53                                 pmd_t *pmd, int write);
54 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
55                                 pud_t *pud, int write);
56 int pmd_huge(pmd_t pmd);
57 int pud_huge(pud_t pmd);
58 void hugetlb_change_protection(struct vm_area_struct *vma,
59                 unsigned long address, unsigned long end, pgprot_t newprot);
60
61 #else /* !CONFIG_HUGETLB_PAGE */
62
63 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
64 {
65         return 0;
66 }
67
68 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
69 {
70 }
71
72 static inline unsigned long hugetlb_total_pages(void)
73 {
74         return 0;
75 }
76
77 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
78 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
79 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
80 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
81 #define unmap_hugepage_range(vma, start, end, page)     BUG()
82 #define hugetlb_report_meminfo(buf)             0
83 #define hugetlb_report_node_meminfo(n, buf)     0
84 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
85 #define follow_huge_pud(mm, addr, pud, write)   NULL
86 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
87 #define pmd_huge(x)     0
88 #define pud_huge(x)     0
89 #define is_hugepage_only_range(mm, addr, len)   0
90 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
91 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
92
93 #define hugetlb_change_protection(vma, address, end, newprot)
94
95 #ifndef HPAGE_MASK
96 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
97 #define HPAGE_SIZE      PAGE_SIZE
98 #endif
99
100 #endif /* !CONFIG_HUGETLB_PAGE */
101
102 #ifdef CONFIG_HUGETLBFS
103 struct hugetlbfs_config {
104         uid_t   uid;
105         gid_t   gid;
106         umode_t mode;
107         long    nr_blocks;
108         long    nr_inodes;
109         struct hstate *hstate;
110 };
111
112 struct hugetlbfs_sb_info {
113         long    max_blocks;   /* blocks allowed */
114         long    free_blocks;  /* blocks free */
115         long    max_inodes;   /* inodes allowed */
116         long    free_inodes;  /* inodes free */
117         spinlock_t      stat_lock;
118         struct hstate *hstate;
119 };
120
121
122 struct hugetlbfs_inode_info {
123         struct shared_policy policy;
124         struct inode vfs_inode;
125 };
126
127 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
128 {
129         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
130 }
131
132 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
133 {
134         return sb->s_fs_info;
135 }
136
137 extern const struct file_operations hugetlbfs_file_operations;
138 extern struct vm_operations_struct hugetlb_vm_ops;
139 struct file *hugetlb_file_setup(const char *name, size_t);
140 int hugetlb_get_quota(struct address_space *mapping, long delta);
141 void hugetlb_put_quota(struct address_space *mapping, long delta);
142
143 static inline int is_file_hugepages(struct file *file)
144 {
145         if (file->f_op == &hugetlbfs_file_operations)
146                 return 1;
147         if (is_file_shm_hugepages(file))
148                 return 1;
149
150         return 0;
151 }
152
153 static inline void set_file_hugepages(struct file *file)
154 {
155         file->f_op = &hugetlbfs_file_operations;
156 }
157 #else /* !CONFIG_HUGETLBFS */
158
159 #define is_file_hugepages(file)         0
160 #define set_file_hugepages(file)        BUG()
161 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
162
163 #endif /* !CONFIG_HUGETLBFS */
164
165 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
166 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
167                                         unsigned long len, unsigned long pgoff,
168                                         unsigned long flags);
169 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
170
171 #ifdef CONFIG_HUGETLB_PAGE
172
173 #define HSTATE_NAME_LEN 32
174 /* Defines one hugetlb page size */
175 struct hstate {
176         int hugetlb_next_nid;
177         unsigned int order;
178         unsigned long mask;
179         unsigned long max_huge_pages;
180         unsigned long nr_huge_pages;
181         unsigned long free_huge_pages;
182         unsigned long resv_huge_pages;
183         unsigned long surplus_huge_pages;
184         unsigned long nr_overcommit_huge_pages;
185         struct list_head hugepage_freelists[MAX_NUMNODES];
186         unsigned int nr_huge_pages_node[MAX_NUMNODES];
187         unsigned int free_huge_pages_node[MAX_NUMNODES];
188         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
189         char name[HSTATE_NAME_LEN];
190 };
191
192 struct huge_bootmem_page {
193         struct list_head list;
194         struct hstate *hstate;
195 };
196
197 /* arch callback */
198 int __init alloc_bootmem_huge_page(struct hstate *h);
199
200 void __init hugetlb_add_hstate(unsigned order);
201 struct hstate *size_to_hstate(unsigned long size);
202
203 #ifndef HUGE_MAX_HSTATE
204 #define HUGE_MAX_HSTATE 1
205 #endif
206
207 extern struct hstate hstates[HUGE_MAX_HSTATE];
208 extern unsigned int default_hstate_idx;
209
210 #define default_hstate (hstates[default_hstate_idx])
211
212 static inline struct hstate *hstate_inode(struct inode *i)
213 {
214         struct hugetlbfs_sb_info *hsb;
215         hsb = HUGETLBFS_SB(i->i_sb);
216         return hsb->hstate;
217 }
218
219 static inline struct hstate *hstate_file(struct file *f)
220 {
221         return hstate_inode(f->f_dentry->d_inode);
222 }
223
224 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
225 {
226         return hstate_file(vma->vm_file);
227 }
228
229 static inline unsigned long huge_page_size(struct hstate *h)
230 {
231         return (unsigned long)PAGE_SIZE << h->order;
232 }
233
234 static inline unsigned long huge_page_mask(struct hstate *h)
235 {
236         return h->mask;
237 }
238
239 static inline unsigned int huge_page_order(struct hstate *h)
240 {
241         return h->order;
242 }
243
244 static inline unsigned huge_page_shift(struct hstate *h)
245 {
246         return h->order + PAGE_SHIFT;
247 }
248
249 static inline unsigned int pages_per_huge_page(struct hstate *h)
250 {
251         return 1 << h->order;
252 }
253
254 static inline unsigned int blocks_per_huge_page(struct hstate *h)
255 {
256         return huge_page_size(h) / 512;
257 }
258
259 #include <asm/hugetlb.h>
260
261 static inline struct hstate *page_hstate(struct page *page)
262 {
263         return size_to_hstate(PAGE_SIZE << compound_order(page));
264 }
265
266 #else
267 struct hstate {};
268 #define alloc_bootmem_huge_page(h) NULL
269 #define hstate_file(f) NULL
270 #define hstate_vma(v) NULL
271 #define hstate_inode(i) NULL
272 #define huge_page_size(h) PAGE_SIZE
273 #define huge_page_mask(h) PAGE_MASK
274 #define huge_page_order(h) 0
275 #define huge_page_shift(h) PAGE_SHIFT
276 static inline unsigned int pages_per_huge_page(struct hstate *h)
277 {
278         return 1;
279 }
280 #endif
281
282 #endif /* _LINUX_HUGETLB_H */