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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 *);
Alexey Dobriyane1759c22008-10-15 23:50:22 +040030void hugetlb_report_meminfo(struct seq_file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031int 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()
Alexey Dobriyane1759c22008-10-15 23:50:22 +040082static inline void hugetlb_report_meminfo(struct seq_file *m)
83{
84}
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#define hugetlb_report_node_meminfo(n, buf) 0
86#define follow_huge_pmd(mm, addr, pmd, write) NULL
Andi Kleenceb86872008-07-23 21:27:50 -070087#define follow_huge_pud(mm, addr, pud, write) NULL
Andi Kleena5516432008-07-23 21:27:41 -070088#define prepare_hugepage_range(file, addr, len) (-EINVAL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#define pmd_huge(x) 0
Andi Kleenceb86872008-07-23 21:27:50 -070090#define pud_huge(x) 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070091#define is_hugepage_only_range(mm, addr, len) 0
David Gibson9da61ae2006-03-22 00:08:57 -080092#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
Hugh Dickinsac9b9c62005-10-20 16:24:28 +010093#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Zhang, Yanmin8f860592006-03-22 00:08:50 -080095#define hugetlb_change_protection(vma, address, end, newprot)
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#ifndef HPAGE_MASK
Robin Holt51c6f662005-11-13 16:06:42 -080098#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
99#define HPAGE_SIZE PAGE_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100#endif
101
102#endif /* !CONFIG_HUGETLB_PAGE */
103
104#ifdef CONFIG_HUGETLBFS
105struct hugetlbfs_config {
106 uid_t uid;
107 gid_t gid;
108 umode_t mode;
109 long nr_blocks;
110 long nr_inodes;
Andi Kleena137e1c2008-07-23 21:27:43 -0700111 struct hstate *hstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112};
113
114struct hugetlbfs_sb_info {
115 long max_blocks; /* blocks allowed */
116 long free_blocks; /* blocks free */
117 long max_inodes; /* inodes allowed */
118 long free_inodes; /* inodes free */
119 spinlock_t stat_lock;
Andi Kleena137e1c2008-07-23 21:27:43 -0700120 struct hstate *hstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121};
122
123
124struct hugetlbfs_inode_info {
125 struct shared_policy policy;
126 struct inode vfs_inode;
127};
128
129static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
130{
131 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
132}
133
134static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
135{
136 return sb->s_fs_info;
137}
138
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800139extern const struct file_operations hugetlbfs_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140extern struct vm_operations_struct hugetlb_vm_ops;
Eric W. Biederman9d665862007-06-16 10:16:16 -0700141struct file *hugetlb_file_setup(const char *name, size_t);
Adam Litke9a119c02007-11-14 16:59:41 -0800142int hugetlb_get_quota(struct address_space *mapping, long delta);
143void hugetlb_put_quota(struct address_space *mapping, long delta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145static inline int is_file_hugepages(struct file *file)
146{
Adam Litke516dffd2007-03-01 15:46:08 -0800147 if (file->f_op == &hugetlbfs_file_operations)
148 return 1;
149 if (is_file_shm_hugepages(file))
150 return 1;
151
152 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153}
154
155static inline void set_file_hugepages(struct file *file)
156{
157 file->f_op = &hugetlbfs_file_operations;
158}
159#else /* !CONFIG_HUGETLBFS */
160
161#define is_file_hugepages(file) 0
162#define set_file_hugepages(file) BUG()
Eric W. Biederman9d665862007-06-16 10:16:16 -0700163#define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165#endif /* !CONFIG_HUGETLBFS */
166
Adrian Bunkd2ba27e82007-05-06 14:49:00 -0700167#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
168unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
169 unsigned long len, unsigned long pgoff,
170 unsigned long flags);
171#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
172
Andi Kleena5516432008-07-23 21:27:41 -0700173#ifdef CONFIG_HUGETLB_PAGE
174
Nishanth Aravamudana3437872008-07-23 21:27:44 -0700175#define HSTATE_NAME_LEN 32
Andi Kleena5516432008-07-23 21:27:41 -0700176/* Defines one hugetlb page size */
177struct hstate {
178 int hugetlb_next_nid;
179 unsigned int order;
180 unsigned long mask;
181 unsigned long max_huge_pages;
182 unsigned long nr_huge_pages;
183 unsigned long free_huge_pages;
184 unsigned long resv_huge_pages;
185 unsigned long surplus_huge_pages;
186 unsigned long nr_overcommit_huge_pages;
187 struct list_head hugepage_freelists[MAX_NUMNODES];
188 unsigned int nr_huge_pages_node[MAX_NUMNODES];
189 unsigned int free_huge_pages_node[MAX_NUMNODES];
190 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
Nishanth Aravamudana3437872008-07-23 21:27:44 -0700191 char name[HSTATE_NAME_LEN];
Andi Kleena5516432008-07-23 21:27:41 -0700192};
193
Jon Tollefson53ba51d2008-07-23 21:27:52 -0700194struct huge_bootmem_page {
195 struct list_head list;
196 struct hstate *hstate;
197};
198
199/* arch callback */
200int __init alloc_bootmem_huge_page(struct hstate *h);
201
Andi Kleene5ff2152008-07-23 21:27:42 -0700202void __init hugetlb_add_hstate(unsigned order);
203struct hstate *size_to_hstate(unsigned long size);
204
205#ifndef HUGE_MAX_HSTATE
206#define HUGE_MAX_HSTATE 1
207#endif
208
209extern struct hstate hstates[HUGE_MAX_HSTATE];
210extern unsigned int default_hstate_idx;
211
212#define default_hstate (hstates[default_hstate_idx])
Andi Kleena5516432008-07-23 21:27:41 -0700213
Andi Kleena137e1c2008-07-23 21:27:43 -0700214static inline struct hstate *hstate_inode(struct inode *i)
Andi Kleena5516432008-07-23 21:27:41 -0700215{
Andi Kleena137e1c2008-07-23 21:27:43 -0700216 struct hugetlbfs_sb_info *hsb;
217 hsb = HUGETLBFS_SB(i->i_sb);
218 return hsb->hstate;
Andi Kleena5516432008-07-23 21:27:41 -0700219}
220
221static inline struct hstate *hstate_file(struct file *f)
222{
Andi Kleena137e1c2008-07-23 21:27:43 -0700223 return hstate_inode(f->f_dentry->d_inode);
Andi Kleena5516432008-07-23 21:27:41 -0700224}
225
Andi Kleena137e1c2008-07-23 21:27:43 -0700226static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
Andi Kleena5516432008-07-23 21:27:41 -0700227{
Andi Kleena137e1c2008-07-23 21:27:43 -0700228 return hstate_file(vma->vm_file);
Andi Kleena5516432008-07-23 21:27:41 -0700229}
230
231static inline unsigned long huge_page_size(struct hstate *h)
232{
233 return (unsigned long)PAGE_SIZE << h->order;
234}
235
236static inline unsigned long huge_page_mask(struct hstate *h)
237{
238 return h->mask;
239}
240
241static inline unsigned int huge_page_order(struct hstate *h)
242{
243 return h->order;
244}
245
246static inline unsigned huge_page_shift(struct hstate *h)
247{
248 return h->order + PAGE_SHIFT;
249}
250
251static inline unsigned int pages_per_huge_page(struct hstate *h)
252{
253 return 1 << h->order;
254}
255
256static inline unsigned int blocks_per_huge_page(struct hstate *h)
257{
258 return huge_page_size(h) / 512;
259}
260
261#include <asm/hugetlb.h>
262
Andi Kleene5ff2152008-07-23 21:27:42 -0700263static inline struct hstate *page_hstate(struct page *page)
264{
265 return size_to_hstate(PAGE_SIZE << compound_order(page));
266}
267
Andi Kleena5516432008-07-23 21:27:41 -0700268#else
269struct hstate {};
Jon Tollefson53ba51d2008-07-23 21:27:52 -0700270#define alloc_bootmem_huge_page(h) NULL
Andi Kleena5516432008-07-23 21:27:41 -0700271#define hstate_file(f) NULL
272#define hstate_vma(v) NULL
273#define hstate_inode(i) NULL
274#define huge_page_size(h) PAGE_SIZE
275#define huge_page_mask(h) PAGE_MASK
276#define huge_page_order(h) 0
277#define huge_page_shift(h) PAGE_SHIFT
Andrea Righi510a35d2008-07-26 15:22:27 -0700278static inline unsigned int pages_per_huge_page(struct hstate *h)
279{
280 return 1;
281}
Andi Kleena5516432008-07-23 21:27:41 -0700282#endif
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284#endif /* _LINUX_HUGETLB_H */