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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;
Jon Tollefson53ba51d2008-07-23 21:27:52 -070042extern struct list_head huge_boot_pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
David Gibson63551ae2005-06-21 17:14:44 -070044/* arch callbacks */
45
Andi Kleena5516432008-07-23 21:27:41 -070046pte_t *huge_pte_alloc(struct mm_struct *mm,
47 unsigned long addr, unsigned long sz);
David Gibson63551ae2005-06-21 17:14:44 -070048pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
Chen, Kenneth W39dde652006-12-06 20:32:03 -080049int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson63551ae2005-06-21 17:14:44 -070050struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
51 int write);
52struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
53 pmd_t *pmd, int write);
Andi Kleenceb86872008-07-23 21:27:50 -070054struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
55 pud_t *pud, int write);
David Gibson63551ae2005-06-21 17:14:44 -070056int pmd_huge(pmd_t pmd);
Andi Kleenceb86872008-07-23 21:27:50 -070057int pud_huge(pud_t pmd);
Zhang, Yanmin8f860592006-03-22 00:08:50 -080058void hugetlb_change_protection(struct vm_area_struct *vma,
59 unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson63551ae2005-06-21 17:14:44 -070060
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#else /* !CONFIG_HUGETLB_PAGE */
62
63static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
64{
65 return 0;
66}
Mel Gormana1e78772008-07-23 21:27:23 -070067
68static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
69{
70}
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072static inline unsigned long hugetlb_total_pages(void)
73{
74 return 0;
75}
76
Adam Litke5b23dbe2007-11-14 16:59:33 -080077#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
79#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
80#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
Mel Gorman04f2cbe2008-07-23 21:27:25 -070081#define unmap_hugepage_range(vma, start, end, page) BUG()
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#define hugetlb_report_meminfo(buf) 0
83#define hugetlb_report_node_meminfo(n, buf) 0
84#define follow_huge_pmd(mm, addr, pmd, write) NULL
Andi Kleenceb86872008-07-23 21:27:50 -070085#define follow_huge_pud(mm, addr, pud, write) NULL
Andi Kleena5516432008-07-23 21:27:41 -070086#define prepare_hugepage_range(file, addr, len) (-EINVAL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#define pmd_huge(x) 0
Andi Kleenceb86872008-07-23 21:27:50 -070088#define pud_huge(x) 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#define is_hugepage_only_range(mm, addr, len) 0
David Gibson9da61ae2006-03-22 00:08:57 -080090#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
Hugh Dickinsac9b9c62005-10-20 16:24:28 +010091#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Zhang, Yanmin8f860592006-03-22 00:08:50 -080093#define hugetlb_change_protection(vma, address, end, newprot)
94
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#ifndef HPAGE_MASK
Robin Holt51c6f662005-11-13 16:06:42 -080096#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
97#define HPAGE_SIZE PAGE_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#endif
99
100#endif /* !CONFIG_HUGETLB_PAGE */
101
102#ifdef CONFIG_HUGETLBFS
103struct hugetlbfs_config {
104 uid_t uid;
105 gid_t gid;
106 umode_t mode;
107 long nr_blocks;
108 long nr_inodes;
Andi Kleena137e1c2008-07-23 21:27:43 -0700109 struct hstate *hstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110};
111
112struct hugetlbfs_sb_info {
113 long max_blocks; /* blocks allowed */
114 long free_blocks; /* blocks free */
115 long max_inodes; /* inodes allowed */
116 long free_inodes; /* inodes free */
117 spinlock_t stat_lock;
Andi Kleena137e1c2008-07-23 21:27:43 -0700118 struct hstate *hstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119};
120
121
122struct hugetlbfs_inode_info {
123 struct shared_policy policy;
124 struct inode vfs_inode;
125};
126
127static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
128{
129 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
130}
131
132static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
133{
134 return sb->s_fs_info;
135}
136
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800137extern const struct file_operations hugetlbfs_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138extern struct vm_operations_struct hugetlb_vm_ops;
Eric W. Biederman9d665862007-06-16 10:16:16 -0700139struct file *hugetlb_file_setup(const char *name, size_t);
Adam Litke9a119c02007-11-14 16:59:41 -0800140int hugetlb_get_quota(struct address_space *mapping, long delta);
141void hugetlb_put_quota(struct address_space *mapping, long delta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143static inline int is_file_hugepages(struct file *file)
144{
Adam Litke516dffd2007-03-01 15:46:08 -0800145 if (file->f_op == &hugetlbfs_file_operations)
146 return 1;
147 if (is_file_shm_hugepages(file))
148 return 1;
149
150 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}
152
153static inline void set_file_hugepages(struct file *file)
154{
155 file->f_op = &hugetlbfs_file_operations;
156}
157#else /* !CONFIG_HUGETLBFS */
158
159#define is_file_hugepages(file) 0
160#define set_file_hugepages(file) BUG()
Eric W. Biederman9d665862007-06-16 10:16:16 -0700161#define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163#endif /* !CONFIG_HUGETLBFS */
164
Adrian Bunkd2ba27e82007-05-06 14:49:00 -0700165#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
166unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
167 unsigned long len, unsigned long pgoff,
168 unsigned long flags);
169#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
170
Andi Kleena5516432008-07-23 21:27:41 -0700171#ifdef CONFIG_HUGETLB_PAGE
172
Nishanth Aravamudana3437872008-07-23 21:27:44 -0700173#define HSTATE_NAME_LEN 32
Andi Kleena5516432008-07-23 21:27:41 -0700174/* Defines one hugetlb page size */
175struct hstate {
176 int hugetlb_next_nid;
177 unsigned int order;
178 unsigned long mask;
179 unsigned long max_huge_pages;
180 unsigned long nr_huge_pages;
181 unsigned long free_huge_pages;
182 unsigned long resv_huge_pages;
183 unsigned long surplus_huge_pages;
184 unsigned long nr_overcommit_huge_pages;
185 struct list_head hugepage_freelists[MAX_NUMNODES];
186 unsigned int nr_huge_pages_node[MAX_NUMNODES];
187 unsigned int free_huge_pages_node[MAX_NUMNODES];
188 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
Nishanth Aravamudana3437872008-07-23 21:27:44 -0700189 char name[HSTATE_NAME_LEN];
Andi Kleena5516432008-07-23 21:27:41 -0700190};
191
Jon Tollefson53ba51d2008-07-23 21:27:52 -0700192struct huge_bootmem_page {
193 struct list_head list;
194 struct hstate *hstate;
195};
196
197/* arch callback */
198int __init alloc_bootmem_huge_page(struct hstate *h);
199
Andi Kleene5ff2152008-07-23 21:27:42 -0700200void __init hugetlb_add_hstate(unsigned order);
201struct hstate *size_to_hstate(unsigned long size);
202
203#ifndef HUGE_MAX_HSTATE
204#define HUGE_MAX_HSTATE 1
205#endif
206
207extern struct hstate hstates[HUGE_MAX_HSTATE];
208extern unsigned int default_hstate_idx;
209
210#define default_hstate (hstates[default_hstate_idx])
Andi Kleena5516432008-07-23 21:27:41 -0700211
Andi Kleena137e1c2008-07-23 21:27:43 -0700212static inline struct hstate *hstate_inode(struct inode *i)
Andi Kleena5516432008-07-23 21:27:41 -0700213{
Andi Kleena137e1c2008-07-23 21:27:43 -0700214 struct hugetlbfs_sb_info *hsb;
215 hsb = HUGETLBFS_SB(i->i_sb);
216 return hsb->hstate;
Andi Kleena5516432008-07-23 21:27:41 -0700217}
218
219static inline struct hstate *hstate_file(struct file *f)
220{
Andi Kleena137e1c2008-07-23 21:27:43 -0700221 return hstate_inode(f->f_dentry->d_inode);
Andi Kleena5516432008-07-23 21:27:41 -0700222}
223
Andi Kleena137e1c2008-07-23 21:27:43 -0700224static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
Andi Kleena5516432008-07-23 21:27:41 -0700225{
Andi Kleena137e1c2008-07-23 21:27:43 -0700226 return hstate_file(vma->vm_file);
Andi Kleena5516432008-07-23 21:27:41 -0700227}
228
229static inline unsigned long huge_page_size(struct hstate *h)
230{
231 return (unsigned long)PAGE_SIZE << h->order;
232}
233
234static inline unsigned long huge_page_mask(struct hstate *h)
235{
236 return h->mask;
237}
238
239static inline unsigned int huge_page_order(struct hstate *h)
240{
241 return h->order;
242}
243
244static inline unsigned huge_page_shift(struct hstate *h)
245{
246 return h->order + PAGE_SHIFT;
247}
248
249static inline unsigned int pages_per_huge_page(struct hstate *h)
250{
251 return 1 << h->order;
252}
253
254static inline unsigned int blocks_per_huge_page(struct hstate *h)
255{
256 return huge_page_size(h) / 512;
257}
258
259#include <asm/hugetlb.h>
260
Andi Kleene5ff2152008-07-23 21:27:42 -0700261static inline struct hstate *page_hstate(struct page *page)
262{
263 return size_to_hstate(PAGE_SIZE << compound_order(page));
264}
265
Andi Kleena5516432008-07-23 21:27:41 -0700266#else
267struct hstate {};
Jon Tollefson53ba51d2008-07-23 21:27:52 -0700268#define alloc_bootmem_huge_page(h) NULL
Andi Kleena5516432008-07-23 21:27:41 -0700269#define hstate_file(f) NULL
270#define hstate_vma(v) NULL
271#define hstate_inode(i) NULL
272#define huge_page_size(h) PAGE_SIZE
273#define huge_page_mask(h) PAGE_MASK
274#define huge_page_order(h) 0
275#define huge_page_shift(h) PAGE_SHIFT
Andrea Righi510a35d2008-07-26 15:22:27 -0700276static inline unsigned int pages_per_huge_page(struct hstate *h)
277{
278 return 1;
279}
Andi Kleena5516432008-07-23 21:27:41 -0700280#endif
281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282#endif /* _LINUX_HUGETLB_H */