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;
13struct user_struct;
14
15int PageHuge(struct page *page);
16
17static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
18{
19 return vma->vm_flags & VM_HUGETLB;
20}
21
22void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
23int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
24int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
25int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
26int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
27int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
28void unmap_hugepage_range(struct vm_area_struct *,
29 unsigned long, unsigned long, struct page *);
30void __unmap_hugepage_range(struct vm_area_struct *,
31 unsigned long, unsigned long, struct page *);
32int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
33void hugetlb_report_meminfo(struct seq_file *);
34int hugetlb_report_node_meminfo(int, char *);
35unsigned long hugetlb_total_pages(void);
36int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
37 unsigned long address, unsigned int flags);
38int hugetlb_reserve_pages(struct inode *inode, long from, long to,
39 struct vm_area_struct *vma,
40 int acctflags);
41void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
42
43extern unsigned long hugepages_treat_as_movable;
44extern const unsigned long hugetlb_zero, hugetlb_infinity;
45extern int sysctl_hugetlb_shm_group;
46extern struct list_head huge_boot_pages;
47
48
49
50pte_t *huge_pte_alloc(struct mm_struct *mm,
51 unsigned long addr, unsigned long sz);
52pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
53int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
54struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
55 int write);
56struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
57 pmd_t *pmd, int write);
58struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
59 pud_t *pud, int write);
60int pmd_huge(pmd_t pmd);
61int pud_huge(pud_t pmd);
62void hugetlb_change_protection(struct vm_area_struct *vma,
63 unsigned long address, unsigned long end, pgprot_t newprot);
64
65#else
66
67static inline int PageHuge(struct page *page)
68{
69 return 0;
70}
71
72static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
73{
74 return 0;
75}
76
77static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
78{
79}
80
81static inline unsigned long hugetlb_total_pages(void)
82{
83 return 0;
84}
85
86#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
87#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
88#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
89#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
90#define unmap_hugepage_range(vma, start, end, page) BUG()
91static inline void hugetlb_report_meminfo(struct seq_file *m)
92{
93}
94#define hugetlb_report_node_meminfo(n, buf) 0
95#define follow_huge_pmd(mm, addr, pmd, write) NULL
96#define follow_huge_pud(mm, addr, pud, write) NULL
97#define prepare_hugepage_range(file, addr, len) (-EINVAL)
98#define pmd_huge(x) 0
99#define pud_huge(x) 0
100#define is_hugepage_only_range(mm, addr, len) 0
101#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
102#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
103
104#define hugetlb_change_protection(vma, address, end, newprot)
105
106#ifndef HPAGE_MASK
107#define HPAGE_MASK PAGE_MASK
108#define HPAGE_SIZE PAGE_SIZE
109#endif
110
111#endif
112
113#ifdef CONFIG_HUGETLBFS
114struct hugetlbfs_config {
115 uid_t uid;
116 gid_t gid;
117 umode_t mode;
118 long nr_blocks;
119 long nr_inodes;
120 struct hstate *hstate;
121};
122
123struct hugetlbfs_sb_info {
124 long max_blocks;
125 long free_blocks;
126 long max_inodes;
127 long free_inodes;
128 spinlock_t stat_lock;
129 struct hstate *hstate;
130};
131
132
133struct hugetlbfs_inode_info {
134 struct shared_policy policy;
135 struct inode vfs_inode;
136};
137
138static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
139{
140 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
141}
142
143static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
144{
145 return sb->s_fs_info;
146}
147
148extern const struct file_operations hugetlbfs_file_operations;
149extern struct vm_operations_struct hugetlb_vm_ops;
150struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
151 struct user_struct **user);
152int hugetlb_get_quota(struct address_space *mapping, long delta);
153void hugetlb_put_quota(struct address_space *mapping, long delta);
154
155static inline int is_file_hugepages(struct file *file)
156{
157 if (file->f_op == &hugetlbfs_file_operations)
158 return 1;
159 if (is_file_shm_hugepages(file))
160 return 1;
161
162 return 0;
163}
164
165static inline void set_file_hugepages(struct file *file)
166{
167 file->f_op = &hugetlbfs_file_operations;
168}
169#else
170
171#define is_file_hugepages(file) 0
172#define set_file_hugepages(file) BUG()
173#define hugetlb_file_setup(name,size,acct,user) ERR_PTR(-ENOSYS)
174
175#endif
176
177#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
178unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
179 unsigned long len, unsigned long pgoff,
180 unsigned long flags);
181#endif
182
183#ifdef CONFIG_HUGETLB_PAGE
184
185#define HSTATE_NAME_LEN 32
186
187struct hstate {
188 int hugetlb_next_nid;
189 unsigned int order;
190 unsigned long mask;
191 unsigned long max_huge_pages;
192 unsigned long nr_huge_pages;
193 unsigned long free_huge_pages;
194 unsigned long resv_huge_pages;
195 unsigned long surplus_huge_pages;
196 unsigned long nr_overcommit_huge_pages;
197 struct list_head hugepage_freelists[MAX_NUMNODES];
198 unsigned int nr_huge_pages_node[MAX_NUMNODES];
199 unsigned int free_huge_pages_node[MAX_NUMNODES];
200 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
201 char name[HSTATE_NAME_LEN];
202};
203
204struct huge_bootmem_page {
205 struct list_head list;
206 struct hstate *hstate;
207};
208
209
210int __init alloc_bootmem_huge_page(struct hstate *h);
211
212void __init hugetlb_add_hstate(unsigned order);
213struct hstate *size_to_hstate(unsigned long size);
214
215#ifndef HUGE_MAX_HSTATE
216#define HUGE_MAX_HSTATE 1
217#endif
218
219extern struct hstate hstates[HUGE_MAX_HSTATE];
220extern unsigned int default_hstate_idx;
221
222#define default_hstate (hstates[default_hstate_idx])
223
224static inline struct hstate *hstate_inode(struct inode *i)
225{
226 struct hugetlbfs_sb_info *hsb;
227 hsb = HUGETLBFS_SB(i->i_sb);
228 return hsb->hstate;
229}
230
231static inline struct hstate *hstate_file(struct file *f)
232{
233 return hstate_inode(f->f_dentry->d_inode);
234}
235
236static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
237{
238 return hstate_file(vma->vm_file);
239}
240
241static inline unsigned long huge_page_size(struct hstate *h)
242{
243 return (unsigned long)PAGE_SIZE << h->order;
244}
245
246extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
247
248extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
249
250static inline unsigned long huge_page_mask(struct hstate *h)
251{
252 return h->mask;
253}
254
255static inline unsigned int huge_page_order(struct hstate *h)
256{
257 return h->order;
258}
259
260static inline unsigned huge_page_shift(struct hstate *h)
261{
262 return h->order + PAGE_SHIFT;
263}
264
265static inline unsigned int pages_per_huge_page(struct hstate *h)
266{
267 return 1 << h->order;
268}
269
270static inline unsigned int blocks_per_huge_page(struct hstate *h)
271{
272 return huge_page_size(h) / 512;
273}
274
275#include <asm/hugetlb.h>
276
277static inline struct hstate *page_hstate(struct page *page)
278{
279 return size_to_hstate(PAGE_SIZE << compound_order(page));
280}
281
282#else
283struct hstate {};
284#define alloc_bootmem_huge_page(h) NULL
285#define hstate_file(f) NULL
286#define hstate_vma(v) NULL
287#define hstate_inode(i) NULL
288#define huge_page_size(h) PAGE_SIZE
289#define huge_page_mask(h) PAGE_MASK
290#define vma_kernel_pagesize(v) PAGE_SIZE
291#define vma_mmu_pagesize(v) PAGE_SIZE
292#define huge_page_order(h) 0
293#define huge_page_shift(h) PAGE_SHIFT
294static inline unsigned int pages_per_huge_page(struct hstate *h)
295{
296 return 1;
297}
298#endif
299
300#endif
301
