Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _LINUX_HUGETLB_H
2#define _LINUX_HUGETLB_H
3
4#include <linux/mm_types.h>
5#include <linux/fs.h>
6#include <linux/hugetlb_inline.h>
7
8struct ctl_table;
9struct user_struct;
10
11#ifdef CONFIG_HUGETLB_PAGE
12
13#include <linux/mempolicy.h>
14#include <linux/shm.h>
15#include <asm/tlbflush.h>
16
17int PageHuge(struct page *page);
18
19void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
20int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
21int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
22int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
23
24#ifdef CONFIG_NUMA
25int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
26 void __user *, size_t *, loff_t *);
27#endif
28
29int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
30int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
31 struct page **, struct vm_area_struct **,
32 unsigned long *, int *, int, unsigned int flags);
33void unmap_hugepage_range(struct vm_area_struct *,
34 unsigned long, unsigned long, struct page *);
35void __unmap_hugepage_range(struct vm_area_struct *,
36 unsigned long, unsigned long, struct page *);
37int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
38void hugetlb_report_meminfo(struct seq_file *);
39int hugetlb_report_node_meminfo(int, char *);
40unsigned long hugetlb_total_pages(void);
41int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
42 unsigned long address, unsigned int flags);
43int hugetlb_reserve_pages(struct inode *inode, long from, long to,
44 struct vm_area_struct *vma,
45 vm_flags_t vm_flags);
46void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
47int dequeue_hwpoisoned_huge_page(struct page *page);
48void copy_huge_page(struct page *dst, struct page *src);
49
50extern unsigned long hugepages_treat_as_movable;
51extern const unsigned long hugetlb_zero, hugetlb_infinity;
52extern int sysctl_hugetlb_shm_group;
53extern struct list_head huge_boot_pages;
54
55/* arch callbacks */
56
57pte_t *huge_pte_alloc(struct mm_struct *mm,
58 unsigned long addr, unsigned long sz);
59pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
60int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
61struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
62 int write);
63struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
64 pmd_t *pmd, int write);
65struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
66 pud_t *pud, int write);
67int pmd_huge(pmd_t pmd);
68int pud_huge(pud_t pmd);
69void hugetlb_change_protection(struct vm_area_struct *vma,
70 unsigned long address, unsigned long end, pgprot_t newprot);
71
72#else /* !CONFIG_HUGETLB_PAGE */
73
74static inline int PageHuge(struct page *page)
75{
76 return 0;
77}
78
79static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
80{
81}
82
83static inline unsigned long hugetlb_total_pages(void)
84{
85 return 0;
86}
87
88#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
89#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
90#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
91#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
92#define unmap_hugepage_range(vma, start, end, page) BUG()
93static inline void hugetlb_report_meminfo(struct seq_file *m)
94{
95}
96#define hugetlb_report_node_meminfo(n, buf) 0
97#define follow_huge_pmd(mm, addr, pmd, write) NULL
98#define follow_huge_pud(mm, addr, pud, write) NULL
99#define prepare_hugepage_range(file, addr, len) (-EINVAL)
100#define pmd_huge(x) 0
101#define pud_huge(x) 0
102#define is_hugepage_only_range(mm, addr, len) 0
103#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
104#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
105#define huge_pte_offset(mm, address) 0
106#define dequeue_hwpoisoned_huge_page(page) 0
107static inline void copy_huge_page(struct page *dst, struct page *src)
108{
109}
110
111#define hugetlb_change_protection(vma, address, end, newprot)
112
113#endif /* !CONFIG_HUGETLB_PAGE */
114
115#define HUGETLB_ANON_FILE "anon_hugepage"
116
117enum {
118 /*
119 * The file will be used as an shm file so shmfs accounting rules
120 * apply
121 */
122 HUGETLB_SHMFS_INODE = 1,
123 /*
124 * The file is being created on the internal vfs mount and shmfs
125 * accounting rules do not apply
126 */
127 HUGETLB_ANONHUGE_INODE = 2,
128};
129
130#ifdef CONFIG_HUGETLBFS
131struct hugetlbfs_config {
132 uid_t uid;
133 gid_t gid;
134 umode_t mode;
135 long nr_blocks;
136 long nr_inodes;
137 struct hstate *hstate;
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 struct hstate *hstate;
147};
148
149
150struct hugetlbfs_inode_info {
151 struct shared_policy policy;
152 struct inode vfs_inode;
153};
154
155static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
156{
157 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
158}
159
160static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
161{
162 return sb->s_fs_info;
163}
164
165extern const struct file_operations hugetlbfs_file_operations;
166extern const struct vm_operations_struct hugetlb_vm_ops;
167struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
168 struct user_struct **user, int creat_flags);
169int hugetlb_get_quota(struct address_space *mapping, long delta);
170void hugetlb_put_quota(struct address_space *mapping, long delta);
171
172static inline int is_file_hugepages(struct file *file)
173{
174 if (file->f_op == &hugetlbfs_file_operations)
175 return 1;
176 if (is_file_shm_hugepages(file))
177 return 1;
178
179 return 0;
180}
181
182static inline void set_file_hugepages(struct file *file)
183{
184 file->f_op = &hugetlbfs_file_operations;
185}
186#else /* !CONFIG_HUGETLBFS */
187
188#define is_file_hugepages(file) 0
189#define set_file_hugepages(file) BUG()
190static inline struct file *hugetlb_file_setup(const char *name, size_t size,
191 vm_flags_t acctflag, struct user_struct **user, int creat_flags)
192{
193 return ERR_PTR(-ENOSYS);
194}
195
196#endif /* !CONFIG_HUGETLBFS */
197
198#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
199unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
200 unsigned long len, unsigned long pgoff,
201 unsigned long flags);
202#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
203
204#ifdef CONFIG_HUGETLB_PAGE
205
206#define HSTATE_NAME_LEN 32
207/* Defines one hugetlb page size */
208struct hstate {
209 int next_nid_to_alloc;
210 int next_nid_to_free;
211 unsigned int order;
212 unsigned long mask;
213 unsigned long max_huge_pages;
214 unsigned long nr_huge_pages;
215 unsigned long free_huge_pages;
216 unsigned long resv_huge_pages;
217 unsigned long surplus_huge_pages;
218 unsigned long nr_overcommit_huge_pages;
219 struct list_head hugepage_freelists[MAX_NUMNODES];
220 unsigned int nr_huge_pages_node[MAX_NUMNODES];
221 unsigned int free_huge_pages_node[MAX_NUMNODES];
222 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
223 char name[HSTATE_NAME_LEN];
224};
225
226struct huge_bootmem_page {
227 struct list_head list;
228 struct hstate *hstate;
229#ifdef CONFIG_HIGHMEM
230 phys_addr_t phys;
231#endif
232};
233
234struct page *alloc_huge_page_node(struct hstate *h, int nid);
235
236/* arch callback */
237int __init alloc_bootmem_huge_page(struct hstate *h);
238
239void __init hugetlb_add_hstate(unsigned order);
240struct hstate *size_to_hstate(unsigned long size);
241
242#ifndef HUGE_MAX_HSTATE
243#define HUGE_MAX_HSTATE 1
244#endif
245
246extern struct hstate hstates[HUGE_MAX_HSTATE];
247extern unsigned int default_hstate_idx;
248
249#define default_hstate (hstates[default_hstate_idx])
250
251static inline struct hstate *hstate_inode(struct inode *i)
252{
253 struct hugetlbfs_sb_info *hsb;
254 hsb = HUGETLBFS_SB(i->i_sb);
255 return hsb->hstate;
256}
257
258static inline struct hstate *hstate_file(struct file *f)
259{
260 return hstate_inode(f->f_dentry->d_inode);
261}
262
263static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
264{
265 return hstate_file(vma->vm_file);
266}
267
268static inline unsigned long huge_page_size(struct hstate *h)
269{
270 return (unsigned long)PAGE_SIZE << h->order;
271}
272
273extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
274
275extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
276
277static inline unsigned long huge_page_mask(struct hstate *h)
278{
279 return h->mask;
280}
281
282static inline unsigned int huge_page_order(struct hstate *h)
283{
284 return h->order;
285}
286
287static inline unsigned huge_page_shift(struct hstate *h)
288{
289 return h->order + PAGE_SHIFT;
290}
291
292static inline unsigned int pages_per_huge_page(struct hstate *h)
293{
294 return 1 << h->order;
295}
296
297static inline unsigned int blocks_per_huge_page(struct hstate *h)
298{
299 return huge_page_size(h) / 512;
300}
301
302#include <asm/hugetlb.h>
303
304static inline struct hstate *page_hstate(struct page *page)
305{
306 return size_to_hstate(PAGE_SIZE << compound_order(page));
307}
308
309static inline unsigned hstate_index_to_shift(unsigned index)
310{
311 return hstates[index].order + PAGE_SHIFT;
312}
313
314#else
315struct hstate {};
316#define alloc_huge_page_node(h, nid) NULL
317#define alloc_bootmem_huge_page(h) NULL
318#define hstate_file(f) NULL
319#define hstate_vma(v) NULL
320#define hstate_inode(i) NULL
321#define huge_page_size(h) PAGE_SIZE
322#define huge_page_mask(h) PAGE_MASK
323#define vma_kernel_pagesize(v) PAGE_SIZE
324#define vma_mmu_pagesize(v) PAGE_SIZE
325#define huge_page_order(h) 0
326#define huge_page_shift(h) PAGE_SHIFT
327static inline unsigned int pages_per_huge_page(struct hstate *h)
328{
329 return 1;
330}
331#define hstate_index_to_shift(index) 0
332#endif
333
334#endif /* _LINUX_HUGETLB_H */