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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 #include <linux/cgroup.h>
8
9 struct ctl_table;
10 struct user_struct;
11 struct mmu_gather;
12
13 #ifdef CONFIG_HUGETLB_PAGE
14
15 #include <linux/mempolicy.h>
16 #include <linux/shm.h>
17 #include <asm/tlbflush.h>
18
19 struct hugepage_subpool {
20 spinlock_t lock;
21 long count;
22 long max_hpages, used_hpages;
23 };
24
25 extern spinlock_t hugetlb_lock;
26 extern int hugetlb_max_hstate __read_mostly;
27 #define for_each_hstate(h) \
28 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
29
30 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
31 void hugepage_put_subpool(struct hugepage_subpool *spool);
32
33 int PageHuge(struct page *page);
34
35 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
36 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
37 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
38 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
39
40 #ifdef CONFIG_NUMA
41 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
42 void __user *, size_t *, loff_t *);
43 #endif
44
45 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
46 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
47 struct page **, struct vm_area_struct **,
48 unsigned long *, int *, int, unsigned int flags);
49 void unmap_hugepage_range(struct vm_area_struct *,
50 unsigned long, unsigned long, struct page *);
51 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
52 struct vm_area_struct *vma,
53 unsigned long start, unsigned long end,
54 struct page *ref_page);
55 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
56 unsigned long start, unsigned long end,
57 struct page *ref_page);
58 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
59 void hugetlb_report_meminfo(struct seq_file *);
60 int hugetlb_report_node_meminfo(int, char *);
61 unsigned long hugetlb_total_pages(void);
62 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
63 unsigned long address, unsigned int flags);
64 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
65 struct vm_area_struct *vma,
66 vm_flags_t vm_flags);
67 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
68 int dequeue_hwpoisoned_huge_page(struct page *page);
69 void copy_huge_page(struct page *dst, struct page *src);
70
71 extern unsigned long hugepages_treat_as_movable;
72 extern const unsigned long hugetlb_zero, hugetlb_infinity;
73 extern int sysctl_hugetlb_shm_group;
74 extern struct list_head huge_boot_pages;
75
76 /* arch callbacks */
77
78 pte_t *huge_pte_alloc(struct mm_struct *mm,
79 unsigned long addr, unsigned long sz);
80 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
81 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
82 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
83 int write);
84 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
85 pmd_t *pmd, int write);
86 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
87 pud_t *pud, int write);
88 int pmd_huge(pmd_t pmd);
89 int pud_huge(pud_t pmd);
90 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
91 unsigned long address, unsigned long end, pgprot_t newprot);
92
93 #else /* !CONFIG_HUGETLB_PAGE */
94
95 static inline int PageHuge(struct page *page)
96 {
97 return 0;
98 }
99
100 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
101 {
102 }
103
104 static inline unsigned long hugetlb_total_pages(void)
105 {
106 return 0;
107 }
108
109 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
110 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
111 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
112 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
113 static inline void hugetlb_report_meminfo(struct seq_file *m)
114 {
115 }
116 #define hugetlb_report_node_meminfo(n, buf) 0
117 #define follow_huge_pmd(mm, addr, pmd, write) NULL
118 #define follow_huge_pud(mm, addr, pud, write) NULL
119 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
120 #define pmd_huge(x) 0
121 #define pud_huge(x) 0
122 #define is_hugepage_only_range(mm, addr, len) 0
123 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
124 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
125 #define huge_pte_offset(mm, address) 0
126 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
127 {
128 return 0;
129 }
130
131 static inline void copy_huge_page(struct page *dst, struct page *src)
132 {
133 }
134
135 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
136 unsigned long address, unsigned long end, pgprot_t newprot)
137 {
138 return 0;
139 }
140
141 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
142 struct vm_area_struct *vma, unsigned long start,
143 unsigned long end, struct page *ref_page)
144 {
145 BUG();
146 }
147
148 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
149 struct vm_area_struct *vma, unsigned long start,
150 unsigned long end, struct page *ref_page)
151 {
152 BUG();
153 }
154
155 #endif /* !CONFIG_HUGETLB_PAGE */
156
157 #define HUGETLB_ANON_FILE "anon_hugepage"
158
159 enum {
160 /*
161 * The file will be used as an shm file so shmfs accounting rules
162 * apply
163 */
164 HUGETLB_SHMFS_INODE = 1,
165 /*
166 * The file is being created on the internal vfs mount and shmfs
167 * accounting rules do not apply
168 */
169 HUGETLB_ANONHUGE_INODE = 2,
170 };
171
172 #ifdef CONFIG_HUGETLBFS
173 struct hugetlbfs_sb_info {
174 long max_inodes; /* inodes allowed */
175 long free_inodes; /* inodes free */
176 spinlock_t stat_lock;
177 struct hstate *hstate;
178 struct hugepage_subpool *spool;
179 };
180
181 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
182 {
183 return sb->s_fs_info;
184 }
185
186 extern const struct file_operations hugetlbfs_file_operations;
187 extern const struct vm_operations_struct hugetlb_vm_ops;
188 struct file *hugetlb_file_setup(const char *name, unsigned long addr,
189 size_t size, vm_flags_t acct,
190 struct user_struct **user, int creat_flags);
191
192 static inline int is_file_hugepages(struct file *file)
193 {
194 if (file->f_op == &hugetlbfs_file_operations)
195 return 1;
196 if (is_file_shm_hugepages(file))
197 return 1;
198
199 return 0;
200 }
201
202 #else /* !CONFIG_HUGETLBFS */
203
204 #define is_file_hugepages(file) 0
205 static inline struct file *
206 hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
207 vm_flags_t acctflag, struct user_struct **user, int creat_flags)
208 {
209 return ERR_PTR(-ENOSYS);
210 }
211
212 #endif /* !CONFIG_HUGETLBFS */
213
214 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
215 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
216 unsigned long len, unsigned long pgoff,
217 unsigned long flags);
218 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
219
220 #ifdef CONFIG_HUGETLB_PAGE
221
222 #define HSTATE_NAME_LEN 32
223 /* Defines one hugetlb page size */
224 struct hstate {
225 int next_nid_to_alloc;
226 int next_nid_to_free;
227 unsigned int order;
228 unsigned long mask;
229 unsigned long max_huge_pages;
230 unsigned long nr_huge_pages;
231 unsigned long free_huge_pages;
232 unsigned long resv_huge_pages;
233 unsigned long surplus_huge_pages;
234 unsigned long nr_overcommit_huge_pages;
235 struct list_head hugepage_activelist;
236 struct list_head hugepage_freelists[MAX_NUMNODES];
237 unsigned int nr_huge_pages_node[MAX_NUMNODES];
238 unsigned int free_huge_pages_node[MAX_NUMNODES];
239 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
240 #ifdef CONFIG_CGROUP_HUGETLB
241 /* cgroup control files */
242 struct cftype cgroup_files[5];
243 #endif
244 char name[HSTATE_NAME_LEN];
245 };
246
247 struct huge_bootmem_page {
248 struct list_head list;
249 struct hstate *hstate;
250 #ifdef CONFIG_HIGHMEM
251 phys_addr_t phys;
252 #endif
253 };
254
255 struct page *alloc_huge_page_node(struct hstate *h, int nid);
256
257 /* arch callback */
258 int __init alloc_bootmem_huge_page(struct hstate *h);
259
260 void __init hugetlb_add_hstate(unsigned order);
261 struct hstate *size_to_hstate(unsigned long size);
262
263 #ifndef HUGE_MAX_HSTATE
264 #define HUGE_MAX_HSTATE 1
265 #endif
266
267 extern struct hstate hstates[HUGE_MAX_HSTATE];
268 extern unsigned int default_hstate_idx;
269
270 #define default_hstate (hstates[default_hstate_idx])
271
272 static inline struct hstate *hstate_inode(struct inode *i)
273 {
274 struct hugetlbfs_sb_info *hsb;
275 hsb = HUGETLBFS_SB(i->i_sb);
276 return hsb->hstate;
277 }
278
279 static inline struct hstate *hstate_file(struct file *f)
280 {
281 return hstate_inode(f->f_dentry->d_inode);
282 }
283
284 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
285 {
286 return hstate_file(vma->vm_file);
287 }
288
289 static inline unsigned long huge_page_size(struct hstate *h)
290 {
291 return (unsigned long)PAGE_SIZE << h->order;
292 }
293
294 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
295
296 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
297
298 static inline unsigned long huge_page_mask(struct hstate *h)
299 {
300 return h->mask;
301 }
302
303 static inline unsigned int huge_page_order(struct hstate *h)
304 {
305 return h->order;
306 }
307
308 static inline unsigned huge_page_shift(struct hstate *h)
309 {
310 return h->order + PAGE_SHIFT;
311 }
312
313 static inline unsigned int pages_per_huge_page(struct hstate *h)
314 {
315 return 1 << h->order;
316 }
317
318 static inline unsigned int blocks_per_huge_page(struct hstate *h)
319 {
320 return huge_page_size(h) / 512;
321 }
322
323 #include <asm/hugetlb.h>
324
325 #ifndef arch_make_huge_pte
326 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
327 struct page *page, int writable)
328 {
329 return entry;
330 }
331 #endif
332
333 static inline struct hstate *page_hstate(struct page *page)
334 {
335 return size_to_hstate(PAGE_SIZE << compound_order(page));
336 }
337
338 static inline unsigned hstate_index_to_shift(unsigned index)
339 {
340 return hstates[index].order + PAGE_SHIFT;
341 }
342
343 static inline int hstate_index(struct hstate *h)
344 {
345 return h - hstates;
346 }
347
348 #else
349 struct hstate {};
350 #define alloc_huge_page_node(h, nid) NULL
351 #define alloc_bootmem_huge_page(h) NULL
352 #define hstate_file(f) NULL
353 #define hstate_vma(v) NULL
354 #define hstate_inode(i) NULL
355 #define huge_page_size(h) PAGE_SIZE
356 #define huge_page_mask(h) PAGE_MASK
357 #define vma_kernel_pagesize(v) PAGE_SIZE
358 #define vma_mmu_pagesize(v) PAGE_SIZE
359 #define huge_page_order(h) 0
360 #define huge_page_shift(h) PAGE_SHIFT
361 static inline unsigned int pages_per_huge_page(struct hstate *h)
362 {
363 return 1;
364 }
365 #define hstate_index_to_shift(index) 0
366 #define hstate_index(h) 0
367 #endif
368
369 #endif /* _LINUX_HUGETLB_H */