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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_HUGETLB_H
2#define _LINUX_HUGETLB_H
3
Alexey Dobriyan4e950f62007-07-30 02:36:13 +04004#include <linux/fs.h>
5
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#ifdef CONFIG_HUGETLB_PAGE
7
8#include <linux/mempolicy.h>
Adam Litke516dffd2007-03-01 15:46:08 -08009#include <linux/shm.h>
David Gibson63551ae2005-06-21 17:14:44 -070010#include <asm/tlbflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
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
Mel Gormana1e78772008-07-23 21:27:23 -070019void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -070020int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
Nishanth Aravamudana3d0c6a2008-02-08 04:18:18 -080021int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
Mel Gorman396faf02007-07-17 04:03:13 -070022int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070023int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
Adam Litke5b23dbe2007-11-14 16:59:33 -080024int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
Mel Gorman04f2cbe2008-07-23 21:27:25 -070025void unmap_hugepage_range(struct vm_area_struct *,
26 unsigned long, unsigned long, struct page *);
27void __unmap_hugepage_range(struct vm_area_struct *,
28 unsigned long, unsigned long, struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
30int hugetlb_report_meminfo(char *);
31int hugetlb_report_node_meminfo(int, char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070032unsigned long hugetlb_total_pages(void);
Hugh Dickinsac9b9c62005-10-20 16:24:28 +010033int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
34 unsigned long address, int write_access);
Mel Gormana1e78772008-07-23 21:27:23 -070035int hugetlb_reserve_pages(struct inode *inode, long from, long to,
36 struct vm_area_struct *vma);
Chen, Kenneth Wa43a8c32006-06-23 02:03:15 -070037void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Mel Gorman396faf02007-07-17 04:03:13 -070039extern unsigned long hugepages_treat_as_movable;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040extern const unsigned long hugetlb_zero, hugetlb_infinity;
41extern int sysctl_hugetlb_shm_group;
42
David Gibson63551ae2005-06-21 17:14:44 -070043/* arch callbacks */
44
Andi Kleena5516432008-07-23 21:27:41 -070045pte_t *huge_pte_alloc(struct mm_struct *mm,
46 unsigned long addr, unsigned long sz);
David Gibson63551ae2005-06-21 17:14:44 -070047pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
Chen, Kenneth W39dde652006-12-06 20:32:03 -080048int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson63551ae2005-06-21 17:14:44 -070049struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
50 int write);
51struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
52 pmd_t *pmd, int write);
David Gibson63551ae2005-06-21 17:14:44 -070053int pmd_huge(pmd_t pmd);
Zhang, Yanmin8f860592006-03-22 00:08:50 -080054void hugetlb_change_protection(struct vm_area_struct *vma,
55 unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson63551ae2005-06-21 17:14:44 -070056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#else /* !CONFIG_HUGETLB_PAGE */
58
59static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
60{
61 return 0;
62}
Mel Gormana1e78772008-07-23 21:27:23 -070063
64static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
65{
66}
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068static inline unsigned long hugetlb_total_pages(void)
69{
70 return 0;
71}
72
Adam Litke5b23dbe2007-11-14 16:59:33 -080073#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
Linus Torvalds1da177e2005-04-16 15:20:36 -070074#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
75#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
76#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
Mel Gorman04f2cbe2008-07-23 21:27:25 -070077#define unmap_hugepage_range(vma, start, end, page) BUG()
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#define hugetlb_report_meminfo(buf) 0
79#define hugetlb_report_node_meminfo(n, buf) 0
80#define follow_huge_pmd(mm, addr, pmd, write) NULL
Andi Kleena5516432008-07-23 21:27:41 -070081#define prepare_hugepage_range(file, addr, len) (-EINVAL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#define pmd_huge(x) 0
83#define is_hugepage_only_range(mm, addr, len) 0
David Gibson9da61ae2006-03-22 00:08:57 -080084#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
Hugh Dickinsac9b9c62005-10-20 16:24:28 +010085#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Zhang, Yanmin8f860592006-03-22 00:08:50 -080087#define hugetlb_change_protection(vma, address, end, newprot)
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#ifndef HPAGE_MASK
Robin Holt51c6f662005-11-13 16:06:42 -080090#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
91#define HPAGE_SIZE PAGE_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070092#endif
93
94#endif /* !CONFIG_HUGETLB_PAGE */
95
96#ifdef CONFIG_HUGETLBFS
97struct hugetlbfs_config {
98 uid_t uid;
99 gid_t gid;
100 umode_t mode;
101 long nr_blocks;
102 long nr_inodes;
Andi Kleena137e1c2008-07-23 21:27:43 -0700103 struct hstate *hstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104};
105
106struct hugetlbfs_sb_info {
107 long max_blocks; /* blocks allowed */
108 long free_blocks; /* blocks free */
109 long max_inodes; /* inodes allowed */
110 long free_inodes; /* inodes free */
111 spinlock_t stat_lock;
Andi Kleena137e1c2008-07-23 21:27:43 -0700112 struct hstate *hstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113};
114
115
116struct hugetlbfs_inode_info {
117 struct shared_policy policy;
118 struct inode vfs_inode;
119};
120
121static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
122{
123 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
124}
125
126static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
127{
128 return sb->s_fs_info;
129}
130
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800131extern const struct file_operations hugetlbfs_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132extern struct vm_operations_struct hugetlb_vm_ops;
Eric W. Biederman9d665862007-06-16 10:16:16 -0700133struct file *hugetlb_file_setup(const char *name, size_t);
Adam Litke9a119c02007-11-14 16:59:41 -0800134int hugetlb_get_quota(struct address_space *mapping, long delta);
135void hugetlb_put_quota(struct address_space *mapping, long delta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137static inline int is_file_hugepages(struct file *file)
138{
Adam Litke516dffd2007-03-01 15:46:08 -0800139 if (file->f_op == &hugetlbfs_file_operations)
140 return 1;
141 if (is_file_shm_hugepages(file))
142 return 1;
143
144 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
147static inline void set_file_hugepages(struct file *file)
148{
149 file->f_op = &hugetlbfs_file_operations;
150}
151#else /* !CONFIG_HUGETLBFS */
152
153#define is_file_hugepages(file) 0
154#define set_file_hugepages(file) BUG()
Eric W. Biederman9d665862007-06-16 10:16:16 -0700155#define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157#endif /* !CONFIG_HUGETLBFS */
158
Adrian Bunkd2ba27e82007-05-06 14:49:00 -0700159#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
160unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
161 unsigned long len, unsigned long pgoff,
162 unsigned long flags);
163#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
164
Andi Kleena5516432008-07-23 21:27:41 -0700165#ifdef CONFIG_HUGETLB_PAGE
166
167/* Defines one hugetlb page size */
168struct hstate {
169 int hugetlb_next_nid;
170 unsigned int order;
171 unsigned long mask;
172 unsigned long max_huge_pages;
173 unsigned long nr_huge_pages;
174 unsigned long free_huge_pages;
175 unsigned long resv_huge_pages;
176 unsigned long surplus_huge_pages;
177 unsigned long nr_overcommit_huge_pages;
178 struct list_head hugepage_freelists[MAX_NUMNODES];
179 unsigned int nr_huge_pages_node[MAX_NUMNODES];
180 unsigned int free_huge_pages_node[MAX_NUMNODES];
181 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
182};
183
Andi Kleene5ff2152008-07-23 21:27:42 -0700184void __init hugetlb_add_hstate(unsigned order);
185struct hstate *size_to_hstate(unsigned long size);
186
187#ifndef HUGE_MAX_HSTATE
188#define HUGE_MAX_HSTATE 1
189#endif
190
191extern struct hstate hstates[HUGE_MAX_HSTATE];
192extern unsigned int default_hstate_idx;
193
194#define default_hstate (hstates[default_hstate_idx])
Andi Kleena5516432008-07-23 21:27:41 -0700195
Andi Kleena137e1c2008-07-23 21:27:43 -0700196static inline struct hstate *hstate_inode(struct inode *i)
Andi Kleena5516432008-07-23 21:27:41 -0700197{
Andi Kleena137e1c2008-07-23 21:27:43 -0700198 struct hugetlbfs_sb_info *hsb;
199 hsb = HUGETLBFS_SB(i->i_sb);
200 return hsb->hstate;
Andi Kleena5516432008-07-23 21:27:41 -0700201}
202
203static inline struct hstate *hstate_file(struct file *f)
204{
Andi Kleena137e1c2008-07-23 21:27:43 -0700205 return hstate_inode(f->f_dentry->d_inode);
Andi Kleena5516432008-07-23 21:27:41 -0700206}
207
Andi Kleena137e1c2008-07-23 21:27:43 -0700208static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
Andi Kleena5516432008-07-23 21:27:41 -0700209{
Andi Kleena137e1c2008-07-23 21:27:43 -0700210 return hstate_file(vma->vm_file);
Andi Kleena5516432008-07-23 21:27:41 -0700211}
212
213static inline unsigned long huge_page_size(struct hstate *h)
214{
215 return (unsigned long)PAGE_SIZE << h->order;
216}
217
218static inline unsigned long huge_page_mask(struct hstate *h)
219{
220 return h->mask;
221}
222
223static inline unsigned int huge_page_order(struct hstate *h)
224{
225 return h->order;
226}
227
228static inline unsigned huge_page_shift(struct hstate *h)
229{
230 return h->order + PAGE_SHIFT;
231}
232
233static inline unsigned int pages_per_huge_page(struct hstate *h)
234{
235 return 1 << h->order;
236}
237
238static inline unsigned int blocks_per_huge_page(struct hstate *h)
239{
240 return huge_page_size(h) / 512;
241}
242
243#include <asm/hugetlb.h>
244
Andi Kleene5ff2152008-07-23 21:27:42 -0700245static inline struct hstate *page_hstate(struct page *page)
246{
247 return size_to_hstate(PAGE_SIZE << compound_order(page));
248}
249
Andi Kleena5516432008-07-23 21:27:41 -0700250#else
251struct hstate {};
252#define hstate_file(f) NULL
253#define hstate_vma(v) NULL
254#define hstate_inode(i) NULL
255#define huge_page_size(h) PAGE_SIZE
256#define huge_page_mask(h) PAGE_MASK
257#define huge_page_order(h) 0
258#define huge_page_shift(h) PAGE_SHIFT
259#define pages_per_huge_page(h) 1
260#endif
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262#endif /* _LINUX_HUGETLB_H */