hugetlb.h 5.8 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
6
#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
7
#include <linux/shm.h>
David Gibson's avatar
David Gibson committed
8
#include <asm/tlbflush.h>
Linus Torvalds's avatar
Linus Torvalds committed
9
10
11
12
13
14
15
16
17
18
19
20

struct ctl_table;

static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	return vma->vm_flags & VM_HUGETLB;
}

int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
21
void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
Linus Torvalds's avatar
Linus Torvalds committed
22
23
24
25
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
int hugetlb_report_meminfo(char *);
int hugetlb_report_node_meminfo(int, char *);
unsigned long hugetlb_total_pages(void);
26
27
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
			unsigned long address, int write_access);
28
29
int hugetlb_reserve_pages(struct inode *inode, long from, long to);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
Linus Torvalds's avatar
Linus Torvalds committed
30
31
32
33
34

extern unsigned long max_huge_pages;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;

David Gibson's avatar
David Gibson committed
35
36
37
38
/* arch callbacks */

pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
39
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson's avatar
David Gibson committed
40
41
42
43
44
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
			      int write);
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
				pmd_t *pmd, int write);
int pmd_huge(pmd_t pmd);
45
46
void hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson's avatar
David Gibson committed
47

Linus Torvalds's avatar
Linus Torvalds committed
48
49
#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
#define is_hugepage_only_range(mm, addr, len)	0
50
51
52
53
#endif

#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
#define hugetlb_free_pgd_range	free_pgd_range
54
55
56
57
#else
void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
			    unsigned long end, unsigned long floor,
			    unsigned long ceiling);
Linus Torvalds's avatar
Linus Torvalds committed
58
59
60
#endif

#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
61
62
63
64
/*
 * If the arch doesn't supply something else, assume that hugepage
 * size aligned regions are ok without further preparation.
 */
65
66
static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
						pgoff_t pgoff)
67
{
68
69
	if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
		return -EINVAL;
70
71
72
73
74
75
	if (len & ~HPAGE_MASK)
		return -EINVAL;
	if (addr & ~HPAGE_MASK)
		return -EINVAL;
	return 0;
}
Linus Torvalds's avatar
Linus Torvalds committed
76
#else
77
78
int prepare_hugepage_range(unsigned long addr, unsigned long len,
						pgoff_t pgoff);
Linus Torvalds's avatar
Linus Torvalds committed
79
80
#endif

David Gibson's avatar
David Gibson committed
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
#define set_huge_pte_at(mm, addr, ptep, pte)	set_pte_at(mm, addr, ptep, pte)
#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
#else
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
		     pte_t *ptep, pte_t pte);
pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
			      pte_t *ptep);
#endif

#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
#define hugetlb_prefault_arch_hook(mm)		do { } while (0)
#else
void hugetlb_prefault_arch_hook(struct mm_struct *mm);
#endif

Linus Torvalds's avatar
Linus Torvalds committed
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
#else /* !CONFIG_HUGETLB_PAGE */

static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	return 0;
}
static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

#define follow_hugetlb_page(m,v,p,vs,a,b,i)	({ BUG(); 0; })
#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
#define hugetlb_prefault(mapping, vma)		({ BUG(); 0; })
#define unmap_hugepage_range(vma, start, end)	BUG()
#define hugetlb_report_meminfo(buf)		0
#define hugetlb_report_node_meminfo(n, buf)	0
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
116
#define prepare_hugepage_range(addr,len,pgoff)	(-EINVAL)
Linus Torvalds's avatar
Linus Torvalds committed
117
118
#define pmd_huge(x)	0
#define is_hugepage_only_range(mm, addr, len)	0
119
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
120
#define hugetlb_fault(mm, vma, addr, write)	({ BUG(); 0; })
Linus Torvalds's avatar
Linus Torvalds committed
121

122
123
#define hugetlb_change_protection(vma, address, end, newprot)

Linus Torvalds's avatar
Linus Torvalds committed
124
#ifndef HPAGE_MASK
125
126
#define HPAGE_MASK	PAGE_MASK		/* Keep the compiler happy */
#define HPAGE_SIZE	PAGE_SIZE
Linus Torvalds's avatar
Linus Torvalds committed
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
#endif

#endif /* !CONFIG_HUGETLB_PAGE */

#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_config {
	uid_t   uid;
	gid_t   gid;
	umode_t mode;
	long	nr_blocks;
	long	nr_inodes;
};

struct hugetlbfs_sb_info {
	long	max_blocks;   /* blocks allowed */
	long	free_blocks;  /* blocks free */
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
};


struct hugetlbfs_inode_info {
	struct shared_policy policy;
	struct inode vfs_inode;
};

static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
{
	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}

static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

164
extern const struct file_operations hugetlbfs_file_operations;
Linus Torvalds's avatar
Linus Torvalds committed
165
166
167
168
169
170
171
extern struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_zero_setup(size_t);
int hugetlb_get_quota(struct address_space *mapping);
void hugetlb_put_quota(struct address_space *mapping);

static inline int is_file_hugepages(struct file *file)
{
172
173
174
175
176
177
	if (file->f_op == &hugetlbfs_file_operations)
		return 1;
	if (is_file_shm_hugepages(file))
		return 1;

	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
}

static inline void set_file_hugepages(struct file *file)
{
	file->f_op = &hugetlbfs_file_operations;
}
#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)		0
#define set_file_hugepages(file)	BUG()
#define hugetlb_zero_setup(size)	ERR_PTR(-ENOSYS)

#endif /* !CONFIG_HUGETLBFS */

#endif /* _LINUX_HUGETLB_H */