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#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
12struct ctl_table;
13
14static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
15{
16 return vma->vm_flags & VM_HUGETLB;
17}
18
19int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
20int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
21int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
22int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
23int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
24void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
25void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
26int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
27int hugetlb_report_meminfo(char *);
28int hugetlb_report_node_meminfo(int, char *);
29unsigned long hugetlb_total_pages(void);
30int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
31 unsigned long address, int write_access);
32int hugetlb_reserve_pages(struct inode *inode, long from, long to);
33void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
34
35extern unsigned long max_huge_pages;
36extern unsigned long sysctl_overcommit_huge_pages;
37extern unsigned long hugepages_treat_as_movable;
38extern const unsigned long hugetlb_zero, hugetlb_infinity;
39extern int sysctl_hugetlb_shm_group;
40
41/* arch callbacks */
42
43pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
44pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
45int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
46struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
47 int write);
48struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
49 pmd_t *pmd, int write);
50int pmd_huge(pmd_t pmd);
51void hugetlb_change_protection(struct vm_area_struct *vma,
52 unsigned long address, unsigned long end, pgprot_t newprot);
53
54#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
55#define is_hugepage_only_range(mm, addr, len) 0
56#endif
57
58#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
59#define hugetlb_free_pgd_range free_pgd_range
60#else
61void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
62 unsigned long end, unsigned long floor,
63 unsigned long ceiling);
64#endif
65
66#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
67/*
68 * If the arch doesn't supply something else, assume that hugepage
69 * size aligned regions are ok without further preparation.
70 */
71static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
72{
73 if (len & ~HPAGE_MASK)
74 return -EINVAL;
75 if (addr & ~HPAGE_MASK)
76 return -EINVAL;
77 return 0;
78}
79#else
80int prepare_hugepage_range(unsigned long addr, unsigned long len);
81#endif
82
83#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
84#define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
85#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
86#else
87void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
88 pte_t *ptep, pte_t pte);
89pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
90 pte_t *ptep);
91#endif
92
93#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
94#define hugetlb_prefault_arch_hook(mm) do { } while (0)
95#else
96void hugetlb_prefault_arch_hook(struct mm_struct *mm);
97#endif
98
99#else /* !CONFIG_HUGETLB_PAGE */
100
101static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
102{
103 return 0;
104}
105static inline unsigned long hugetlb_total_pages(void)
106{
107 return 0;
108}
109
110#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
111#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
112#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
113#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
114#define unmap_hugepage_range(vma, start, end) BUG()
115#define hugetlb_report_meminfo(buf) 0
116#define hugetlb_report_node_meminfo(n, buf) 0
117#define follow_huge_pmd(mm, addr, pmd, write) NULL
118#define prepare_hugepage_range(addr,len) (-EINVAL)
119#define pmd_huge(x) 0
120#define is_hugepage_only_range(mm, addr, len) 0
121#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
122#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
123
124#define hugetlb_change_protection(vma, address, end, newprot)
125
126#ifndef HPAGE_MASK
127#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
128#define HPAGE_SIZE PAGE_SIZE
129#endif
130
131#endif /* !CONFIG_HUGETLB_PAGE */
132
133#ifdef CONFIG_HUGETLBFS
134struct hugetlbfs_config {
135 uid_t uid;
136 gid_t gid;
137 umode_t mode;
138 long nr_blocks;
139 long nr_inodes;
140};
141
142struct hugetlbfs_sb_info {
143 long max_blocks; /* blocks allowed */
144 long free_blocks; /* blocks free */
145 long max_inodes; /* inodes allowed */
146 long free_inodes; /* inodes free */
147 spinlock_t stat_lock;
148};
149
150
151struct hugetlbfs_inode_info {
152 struct shared_policy policy;
153 struct inode vfs_inode;
154};
155
156static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
157{
158 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
159}
160
161static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
162{
163 return sb->s_fs_info;
164}
165
166extern const struct file_operations hugetlbfs_file_operations;
167extern struct vm_operations_struct hugetlb_vm_ops;
168struct file *hugetlb_file_setup(const char *name, size_t);
169int hugetlb_get_quota(struct address_space *mapping, long delta);
170void hugetlb_put_quota(struct address_space *mapping, long delta);
171
172#define BLOCKS_PER_HUGEPAGE (HPAGE_SIZE / 512)
173
174static 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
184static 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
197unsigned 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 */