tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _LINUX_HUGETLB_H
2#define _LINUX_HUGETLB_H
3
4#ifdef CONFIG_HUGETLB_PAGE
5
6#include <linux/mempolicy.h>
7#include <asm/tlbflush.h>
8
9struct ctl_table;
10
11static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
12{
13 return vma->vm_flags & VM_HUGETLB;
14}
15
16int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
17int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
18int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
19void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
20void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
21int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
22int hugetlb_report_meminfo(char *);
23int hugetlb_report_node_meminfo(int, char *);
24unsigned long hugetlb_total_pages(void);
25int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
26 unsigned long address, int write_access);
27int hugetlb_reserve_pages(struct inode *inode, long from, long to);
28void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
29
30extern unsigned long max_huge_pages;
31extern const unsigned long hugetlb_zero, hugetlb_infinity;
32extern int sysctl_hugetlb_shm_group;
33
34/* arch callbacks */
35
36pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
37pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
38struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
39 int write);
40struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
41 pmd_t *pmd, int write);
42int pmd_huge(pmd_t pmd);
43void hugetlb_change_protection(struct vm_area_struct *vma,
44 unsigned long address, unsigned long end, pgprot_t newprot);
45
46#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
47#define is_hugepage_only_range(mm, addr, len) 0
48#endif
49
50#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
51#define hugetlb_free_pgd_range free_pgd_range
52#else
53void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
54 unsigned long end, unsigned long floor,
55 unsigned long ceiling);
56#endif
57
58#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
59/*
60 * If the arch doesn't supply something else, assume that hugepage
61 * size aligned regions are ok without further preparation.
62 */
63static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
64 pgoff_t pgoff)
65{
66 if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
67 return -EINVAL;
68 if (len & ~HPAGE_MASK)
69 return -EINVAL;
70 if (addr & ~HPAGE_MASK)
71 return -EINVAL;
72 return 0;
73}
74#else
75int prepare_hugepage_range(unsigned long addr, unsigned long len,
76 pgoff_t pgoff);
77#endif
78
79#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
80#define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
81#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
82#else
83void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
84 pte_t *ptep, pte_t pte);
85pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
86 pte_t *ptep);
87#endif
88
89#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
90#define hugetlb_prefault_arch_hook(mm) do { } while (0)
91#else
92void hugetlb_prefault_arch_hook(struct mm_struct *mm);
93#endif
94
95#else /* !CONFIG_HUGETLB_PAGE */
96
97static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
98{
99 return 0;
100}
101static inline unsigned long hugetlb_total_pages(void)
102{
103 return 0;
104}
105
106#define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
107#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
108#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
109#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
110#define unmap_hugepage_range(vma, start, end) BUG()
111#define hugetlb_report_meminfo(buf) 0
112#define hugetlb_report_node_meminfo(n, buf) 0
113#define follow_huge_pmd(mm, addr, pmd, write) NULL
114#define prepare_hugepage_range(addr,len,pgoff) (-EINVAL)
115#define pmd_huge(x) 0
116#define is_hugepage_only_range(mm, addr, len) 0
117#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
118#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
119
120#define hugetlb_change_protection(vma, address, end, newprot)
121
122#ifndef HPAGE_MASK
123#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
124#define HPAGE_SIZE PAGE_SIZE
125#endif
126
127#endif /* !CONFIG_HUGETLB_PAGE */
128
129#ifdef CONFIG_HUGETLBFS
130struct hugetlbfs_config {
131 uid_t uid;
132 gid_t gid;
133 umode_t mode;
134 long nr_blocks;
135 long nr_inodes;
136};
137
138struct hugetlbfs_sb_info {
139 long max_blocks; /* blocks allowed */
140 long free_blocks; /* blocks free */
141 long max_inodes; /* inodes allowed */
142 long free_inodes; /* inodes free */
143 spinlock_t stat_lock;
144};
145
146
147struct hugetlbfs_inode_info {
148 struct shared_policy policy;
149 struct inode vfs_inode;
150};
151
152static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
153{
154 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
155}
156
157static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
158{
159 return sb->s_fs_info;
160}
161
162extern const struct file_operations hugetlbfs_file_operations;
163extern struct vm_operations_struct hugetlb_vm_ops;
164struct file *hugetlb_zero_setup(size_t);
165int hugetlb_get_quota(struct address_space *mapping);
166void hugetlb_put_quota(struct address_space *mapping);
167
168static inline int is_file_hugepages(struct file *file)
169{
170 return file->f_op == &hugetlbfs_file_operations;
171}
172
173static inline void set_file_hugepages(struct file *file)
174{
175 file->f_op = &hugetlbfs_file_operations;
176}
177#else /* !CONFIG_HUGETLBFS */
178
179#define is_file_hugepages(file) 0
180#define set_file_hugepages(file) BUG()
181#define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
182
183#endif /* !CONFIG_HUGETLBFS */
184
185#endif /* _LINUX_HUGETLB_H */