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hugetlb.h
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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 {
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 
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);
50  unsigned long, unsigned long, struct page *);
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,
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);
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 #define hugetlb_change_protection(vma, address, end, newprot)
136 
137 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
138  struct vm_area_struct *vma, unsigned long start,
139  unsigned long end, struct page *ref_page)
140 {
141  BUG();
142 }
143 
144 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
145  struct vm_area_struct *vma, unsigned long start,
146  unsigned long end, struct page *ref_page)
147 {
148  BUG();
149 }
150 
151 #endif /* !CONFIG_HUGETLB_PAGE */
152 
153 #define HUGETLB_ANON_FILE "anon_hugepage"
154 
155 enum {
156  /*
157  * The file will be used as an shm file so shmfs accounting rules
158  * apply
159  */
161  /*
162  * The file is being created on the internal vfs mount and shmfs
163  * accounting rules do not apply
164  */
166 };
167 
168 #ifdef CONFIG_HUGETLBFS
169 struct hugetlbfs_sb_info {
170  long max_inodes; /* inodes allowed */
171  long free_inodes; /* inodes free */
172  spinlock_t stat_lock;
173  struct hstate *hstate;
174  struct hugepage_subpool *spool;
175 };
176 
177 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
178 {
179  return sb->s_fs_info;
180 }
181 
182 extern const struct file_operations hugetlbfs_file_operations;
183 extern const struct vm_operations_struct hugetlb_vm_ops;
184 struct file *hugetlb_file_setup(const char *name, unsigned long addr,
185  size_t size, vm_flags_t acct,
186  struct user_struct **user, int creat_flags);
187 
188 static inline int is_file_hugepages(struct file *file)
189 {
190  if (file->f_op == &hugetlbfs_file_operations)
191  return 1;
192  if (is_file_shm_hugepages(file))
193  return 1;
194 
195  return 0;
196 }
197 
198 #else /* !CONFIG_HUGETLBFS */
199 
200 #define is_file_hugepages(file) 0
201 static inline struct file *
202 hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
203  vm_flags_t acctflag, struct user_struct **user, int creat_flags)
204 {
205  return ERR_PTR(-ENOSYS);
206 }
207 
208 #endif /* !CONFIG_HUGETLBFS */
209 
210 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
211 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
212  unsigned long len, unsigned long pgoff,
213  unsigned long flags);
214 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
215 
216 #ifdef CONFIG_HUGETLB_PAGE
217 
218 #define HSTATE_NAME_LEN 32
219 /* Defines one hugetlb page size */
220 struct hstate {
221  int next_nid_to_alloc;
222  int next_nid_to_free;
223  unsigned int order;
224  unsigned long mask;
225  unsigned long max_huge_pages;
226  unsigned long nr_huge_pages;
227  unsigned long free_huge_pages;
228  unsigned long resv_huge_pages;
229  unsigned long surplus_huge_pages;
230  unsigned long nr_overcommit_huge_pages;
231  struct list_head hugepage_activelist;
232  struct list_head hugepage_freelists[MAX_NUMNODES];
233  unsigned int nr_huge_pages_node[MAX_NUMNODES];
234  unsigned int free_huge_pages_node[MAX_NUMNODES];
235  unsigned int surplus_huge_pages_node[MAX_NUMNODES];
236 #ifdef CONFIG_CGROUP_HUGETLB
237  /* cgroup control files */
238  struct cftype cgroup_files[5];
239 #endif
240  char name[HSTATE_NAME_LEN];
241 };
242 
243 struct huge_bootmem_page {
244  struct list_head list;
245  struct hstate *hstate;
246 #ifdef CONFIG_HIGHMEM
248 #endif
249 };
250 
251 struct page *alloc_huge_page_node(struct hstate *h, int nid);
252 
253 /* arch callback */
255 
256 void __init hugetlb_add_hstate(unsigned order);
257 struct hstate *size_to_hstate(unsigned long size);
258 
259 #ifndef HUGE_MAX_HSTATE
260 #define HUGE_MAX_HSTATE 1
261 #endif
262 
263 extern struct hstate hstates[HUGE_MAX_HSTATE];
264 extern unsigned int default_hstate_idx;
265 
266 #define default_hstate (hstates[default_hstate_idx])
267 
268 static inline struct hstate *hstate_inode(struct inode *i)
269 {
270  struct hugetlbfs_sb_info *hsb;
271  hsb = HUGETLBFS_SB(i->i_sb);
272  return hsb->hstate;
273 }
274 
275 static inline struct hstate *hstate_file(struct file *f)
276 {
277  return hstate_inode(f->f_dentry->d_inode);
278 }
279 
280 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
281 {
282  return hstate_file(vma->vm_file);
283 }
284 
285 static inline unsigned long huge_page_size(struct hstate *h)
286 {
287  return (unsigned long)PAGE_SIZE << h->order;
288 }
289 
290 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
291 
292 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
293 
294 static inline unsigned long huge_page_mask(struct hstate *h)
295 {
296  return h->mask;
297 }
298 
299 static inline unsigned int huge_page_order(struct hstate *h)
300 {
301  return h->order;
302 }
303 
304 static inline unsigned huge_page_shift(struct hstate *h)
305 {
306  return h->order + PAGE_SHIFT;
307 }
308 
309 static inline unsigned int pages_per_huge_page(struct hstate *h)
310 {
311  return 1 << h->order;
312 }
313 
314 static inline unsigned int blocks_per_huge_page(struct hstate *h)
315 {
316  return huge_page_size(h) / 512;
317 }
318 
319 #include <asm/hugetlb.h>
320 
321 #ifndef arch_make_huge_pte
322 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
323  struct page *page, int writable)
324 {
325  return entry;
326 }
327 #endif
328 
329 static inline struct hstate *page_hstate(struct page *page)
330 {
331  return size_to_hstate(PAGE_SIZE << compound_order(page));
332 }
333 
334 static inline unsigned hstate_index_to_shift(unsigned index)
335 {
336  return hstates[index].order + PAGE_SHIFT;
337 }
338 
339 static inline int hstate_index(struct hstate *h)
340 {
341  return h - hstates;
342 }
343 
344 #else
345 struct hstate {};
346 #define alloc_huge_page_node(h, nid) NULL
347 #define alloc_bootmem_huge_page(h) NULL
348 #define hstate_file(f) NULL
349 #define hstate_vma(v) NULL
350 #define hstate_inode(i) NULL
351 #define huge_page_size(h) PAGE_SIZE
352 #define huge_page_mask(h) PAGE_MASK
353 #define vma_kernel_pagesize(v) PAGE_SIZE
354 #define vma_mmu_pagesize(v) PAGE_SIZE
355 #define huge_page_order(h) 0
356 #define huge_page_shift(h) PAGE_SHIFT
357 static inline unsigned int pages_per_huge_page(struct hstate *h)
358 {
359  return 1;
360 }
361 #define hstate_index_to_shift(index) 0
362 #define hstate_index(h) 0
363 #endif
364 
365 #endif /* _LINUX_HUGETLB_H */