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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_HUGETLB_H
2#define _LINUX_HUGETLB_H
3
4#ifdef CONFIG_HUGETLB_PAGE
5
6#include <linux/mempolicy.h>
Adam Litke516dffd2007-03-01 15:46:08 -08007#include <linux/shm.h>
David Gibson63551ae2005-06-21 17:14:44 -07008#include <asm/tlbflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10struct ctl_table;
11
12static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
13{
14 return vma->vm_flags & VM_HUGETLB;
15}
16
17int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
18int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
19int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070020void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
Chen, Kenneth W502717f2006-10-11 01:20:46 -070021void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -070022int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
23int hugetlb_report_meminfo(char *);
24int hugetlb_report_node_meminfo(int, char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070025unsigned long hugetlb_total_pages(void);
Hugh Dickinsac9b9c62005-10-20 16:24:28 +010026int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
27 unsigned long address, int write_access);
Chen, Kenneth Wa43a8c32006-06-23 02:03:15 -070028int hugetlb_reserve_pages(struct inode *inode, long from, long to);
29void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31extern unsigned long max_huge_pages;
32extern const unsigned long hugetlb_zero, hugetlb_infinity;
33extern int sysctl_hugetlb_shm_group;
34
David Gibson63551ae2005-06-21 17:14:44 -070035/* arch callbacks */
36
37pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
38pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
Chen, Kenneth W39dde652006-12-06 20:32:03 -080039int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson63551ae2005-06-21 17:14:44 -070040struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
41 int write);
42struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
43 pmd_t *pmd, int write);
David Gibson63551ae2005-06-21 17:14:44 -070044int pmd_huge(pmd_t pmd);
Zhang, Yanmin8f860592006-03-22 00:08:50 -080045void hugetlb_change_protection(struct vm_area_struct *vma,
46 unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson63551ae2005-06-21 17:14:44 -070047
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
49#define is_hugepage_only_range(mm, addr, len) 0
David Gibson9da61ae2006-03-22 00:08:57 -080050#endif
51
52#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
53#define hugetlb_free_pgd_range free_pgd_range
David Gibson3915bcf2006-03-22 00:08:59 -080054#else
55void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
56 unsigned long end, unsigned long floor,
57 unsigned long ceiling);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#endif
59
60#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
David Gibson42b88be2006-03-22 00:09:01 -080061/*
62 * If the arch doesn't supply something else, assume that hugepage
63 * size aligned regions are ok without further preparation.
64 */
Hugh Dickins68589bc2006-11-14 02:03:32 -080065static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
66 pgoff_t pgoff)
David Gibson42b88be2006-03-22 00:09:01 -080067{
Hugh Dickins68589bc2006-11-14 02:03:32 -080068 if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
69 return -EINVAL;
David Gibson42b88be2006-03-22 00:09:01 -080070 if (len & ~HPAGE_MASK)
71 return -EINVAL;
72 if (addr & ~HPAGE_MASK)
73 return -EINVAL;
74 return 0;
75}
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#else
Hugh Dickins68589bc2006-11-14 02:03:32 -080077int prepare_hugepage_range(unsigned long addr, unsigned long len,
78 pgoff_t pgoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#endif
80
David Gibson63551ae2005-06-21 17:14:44 -070081#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
82#define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
83#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
84#else
85void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
86 pte_t *ptep, pte_t pte);
87pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
88 pte_t *ptep);
89#endif
90
91#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
92#define hugetlb_prefault_arch_hook(mm) do { } while (0)
93#else
94void hugetlb_prefault_arch_hook(struct mm_struct *mm);
95#endif
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#else /* !CONFIG_HUGETLB_PAGE */
98
99static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
100{
101 return 0;
102}
103static inline unsigned long hugetlb_total_pages(void)
104{
105 return 0;
106}
107
108#define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
109#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
110#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
111#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112#define unmap_hugepage_range(vma, start, end) BUG()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113#define hugetlb_report_meminfo(buf) 0
114#define hugetlb_report_node_meminfo(n, buf) 0
115#define follow_huge_pmd(mm, addr, pmd, write) NULL
Hugh Dickins68589bc2006-11-14 02:03:32 -0800116#define prepare_hugepage_range(addr,len,pgoff) (-EINVAL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#define pmd_huge(x) 0
118#define is_hugepage_only_range(mm, addr, len) 0
David Gibson9da61ae2006-03-22 00:08:57 -0800119#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
Hugh Dickinsac9b9c62005-10-20 16:24:28 +0100120#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Zhang, Yanmin8f860592006-03-22 00:08:50 -0800122#define hugetlb_change_protection(vma, address, end, newprot)
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124#ifndef HPAGE_MASK
Robin Holt51c6f662005-11-13 16:06:42 -0800125#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
126#define HPAGE_SIZE PAGE_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127#endif
128
129#endif /* !CONFIG_HUGETLB_PAGE */
130
131#ifdef CONFIG_HUGETLBFS
132struct hugetlbfs_config {
133 uid_t uid;
134 gid_t gid;
135 umode_t mode;
136 long nr_blocks;
137 long nr_inodes;
138};
139
140struct hugetlbfs_sb_info {
141 long max_blocks; /* blocks allowed */
142 long free_blocks; /* blocks free */
143 long max_inodes; /* inodes allowed */
144 long free_inodes; /* inodes free */
145 spinlock_t stat_lock;
146};
147
148
149struct hugetlbfs_inode_info {
150 struct shared_policy policy;
151 struct inode vfs_inode;
152};
153
154static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
155{
156 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
157}
158
159static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
160{
161 return sb->s_fs_info;
162}
163
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800164extern const struct file_operations hugetlbfs_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165extern struct vm_operations_struct hugetlb_vm_ops;
166struct file *hugetlb_zero_setup(size_t);
167int hugetlb_get_quota(struct address_space *mapping);
168void hugetlb_put_quota(struct address_space *mapping);
169
170static inline int is_file_hugepages(struct file *file)
171{
Adam Litke516dffd2007-03-01 15:46:08 -0800172 if (file->f_op == &hugetlbfs_file_operations)
173 return 1;
174 if (is_file_shm_hugepages(file))
175 return 1;
176
177 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
179
180static inline void set_file_hugepages(struct file *file)
181{
182 file->f_op = &hugetlbfs_file_operations;
183}
184#else /* !CONFIG_HUGETLBFS */
185
186#define is_file_hugepages(file) 0
187#define set_file_hugepages(file) BUG()
188#define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
190#endif /* !CONFIG_HUGETLBFS */
191
192#endif /* _LINUX_HUGETLB_H */