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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 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
20 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
21 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
22 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
23 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
24 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
25 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
26 int hugetlb_report_meminfo(char *);
27 int hugetlb_report_node_meminfo(int, char *);
28 unsigned long hugetlb_total_pages(void);
29 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
30 unsigned long address, int write_access);
31 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
32 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
33
34 extern unsigned long max_huge_pages;
35 extern unsigned long hugepages_treat_as_movable;
36 extern const unsigned long hugetlb_zero, hugetlb_infinity;
37 extern int sysctl_hugetlb_shm_group;
38
39 /* arch callbacks */
40
41 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
42 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
43 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
44 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
45 int write);
46 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
47 pmd_t *pmd, int write);
48 int pmd_huge(pmd_t pmd);
49 void hugetlb_change_protection(struct vm_area_struct *vma,
50 unsigned long address, unsigned long end, pgprot_t newprot);
51
52 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
53 #define is_hugepage_only_range(mm, addr, len) 0
54 #endif
55
56 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
57 #define hugetlb_free_pgd_range free_pgd_range
58 #else
59 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
60 unsigned long end, unsigned long floor,
61 unsigned long ceiling);
62 #endif
63
64 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
65 /*
66 * If the arch doesn't supply something else, assume that hugepage
67 * size aligned regions are ok without further preparation.
68 */
69 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
70 pgoff_t pgoff)
71 {
72 if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
73 return -EINVAL;
74 if (len & ~HPAGE_MASK)
75 return -EINVAL;
76 if (addr & ~HPAGE_MASK)
77 return -EINVAL;
78 return 0;
79 }
80 #else
81 int prepare_hugepage_range(unsigned long addr, unsigned long len,
82 pgoff_t pgoff);
83 #endif
84
85 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
86 #define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
87 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
88 #else
89 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
90 pte_t *ptep, pte_t pte);
91 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
92 pte_t *ptep);
93 #endif
94
95 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
96 #define hugetlb_prefault_arch_hook(mm) do { } while (0)
97 #else
98 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
99 #endif
100
101 #else /* !CONFIG_HUGETLB_PAGE */
102
103 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
104 {
105 return 0;
106 }
107 static inline unsigned long hugetlb_total_pages(void)
108 {
109 return 0;
110 }
111
112 #define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
113 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
114 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
115 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
116 #define unmap_hugepage_range(vma, start, end) BUG()
117 #define hugetlb_report_meminfo(buf) 0
118 #define hugetlb_report_node_meminfo(n, buf) 0
119 #define follow_huge_pmd(mm, addr, pmd, write) NULL
120 #define prepare_hugepage_range(addr,len,pgoff) (-EINVAL)
121 #define pmd_huge(x) 0
122 #define is_hugepage_only_range(mm, addr, len) 0
123 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
124 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
125
126 #define hugetlb_change_protection(vma, address, end, newprot)
127
128 #ifndef HPAGE_MASK
129 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
130 #define HPAGE_SIZE PAGE_SIZE
131 #endif
132
133 #endif /* !CONFIG_HUGETLB_PAGE */
134
135 #ifdef CONFIG_HUGETLBFS
136 struct hugetlbfs_config {
137 uid_t uid;
138 gid_t gid;
139 umode_t mode;
140 long nr_blocks;
141 long nr_inodes;
142 };
143
144 struct hugetlbfs_sb_info {
145 long max_blocks; /* blocks allowed */
146 long free_blocks; /* blocks free */
147 long max_inodes; /* inodes allowed */
148 long free_inodes; /* inodes free */
149 spinlock_t stat_lock;
150 };
151
152
153 struct hugetlbfs_inode_info {
154 struct shared_policy policy;
155 struct inode vfs_inode;
156 };
157
158 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
159 {
160 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
161 }
162
163 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
164 {
165 return sb->s_fs_info;
166 }
167
168 extern const struct file_operations hugetlbfs_file_operations;
169 extern struct vm_operations_struct hugetlb_vm_ops;
170 struct file *hugetlb_file_setup(const char *name, size_t);
171 int hugetlb_get_quota(struct address_space *mapping);
172 void hugetlb_put_quota(struct address_space *mapping);
173
174 static inline int is_file_hugepages(struct file *file)
175 {
176 if (file->f_op == &hugetlbfs_file_operations)
177 return 1;
178 if (is_file_shm_hugepages(file))
179 return 1;
180
181 return 0;
182 }
183
184 static inline void set_file_hugepages(struct file *file)
185 {
186 file->f_op = &hugetlbfs_file_operations;
187 }
188 #else /* !CONFIG_HUGETLBFS */
189
190 #define is_file_hugepages(file) 0
191 #define set_file_hugepages(file) BUG()
192 #define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
193
194 #endif /* !CONFIG_HUGETLBFS */
195
196 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
197 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
198 unsigned long len, unsigned long pgoff,
199 unsigned long flags);
200 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
201
202 #endif /* _LINUX_HUGETLB_H */