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TOMOYO Linux Cross Reference
Linux/include/linux/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 
  8 struct ctl_table;
  9 struct 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 
 17 int PageHuge(struct page *page);
 18 
 19 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
 20 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
 21 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
 22 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
 23 
 24 #ifdef CONFIG_NUMA
 25 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
 26                                         void __user *, size_t *, loff_t *);
 27 #endif
 28 
 29 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
 30 int 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);
 33 void unmap_hugepage_range(struct vm_area_struct *,
 34                         unsigned long, unsigned long, struct page *);
 35 void __unmap_hugepage_range(struct vm_area_struct *,
 36                         unsigned long, unsigned long, struct page *);
 37 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
 38 void hugetlb_report_meminfo(struct seq_file *);
 39 int hugetlb_report_node_meminfo(int, char *);
 40 unsigned long hugetlb_total_pages(void);
 41 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 42                         unsigned long address, unsigned int flags);
 43 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
 44                                                 struct vm_area_struct *vma,
 45                                                 vm_flags_t vm_flags);
 46 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
 47 int dequeue_hwpoisoned_huge_page(struct page *page);
 48 void copy_huge_page(struct page *dst, struct page *src);
 49 
 50 extern unsigned long hugepages_treat_as_movable;
 51 extern const unsigned long hugetlb_zero, hugetlb_infinity;
 52 extern int sysctl_hugetlb_shm_group;
 53 extern struct list_head huge_boot_pages;
 54 
 55 /* arch callbacks */
 56 
 57 pte_t *huge_pte_alloc(struct mm_struct *mm,
 58                         unsigned long addr, unsigned long sz);
 59 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
 60 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
 61 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
 62                               int write);
 63 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
 64                                 pmd_t *pmd, int write);
 65 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
 66                                 pud_t *pud, int write);
 67 int pmd_huge(pmd_t pmd);
 68 int pud_huge(pud_t pmd);
 69 void 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 
 74 static inline int PageHuge(struct page *page)
 75 {
 76         return 0;
 77 }
 78 
 79 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 80 {
 81 }
 82 
 83 static 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()
 93 static 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
107 static 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 #ifndef HPAGE_MASK
114 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
115 #define HPAGE_SIZE      PAGE_SIZE
116 #endif
117 
118 #endif /* !CONFIG_HUGETLB_PAGE */
119 
120 #define HUGETLB_ANON_FILE "anon_hugepage"
121 
122 enum {
123         /*
124          * The file will be used as an shm file so shmfs accounting rules
125          * apply
126          */
127         HUGETLB_SHMFS_INODE     = 1,
128         /*
129          * The file is being created on the internal vfs mount and shmfs
130          * accounting rules do not apply
131          */
132         HUGETLB_ANONHUGE_INODE  = 2,
133 };
134 
135 #ifdef CONFIG_HUGETLBFS
136 struct hugetlbfs_config {
137         uid_t   uid;
138         gid_t   gid;
139         umode_t mode;
140         long    nr_blocks;
141         long    nr_inodes;
142         struct hstate *hstate;
143 };
144 
145 struct hugetlbfs_sb_info {
146         long    max_blocks;   /* blocks allowed */
147         long    free_blocks;  /* blocks free */
148         long    max_inodes;   /* inodes allowed */
149         long    free_inodes;  /* inodes free */
150         spinlock_t      stat_lock;
151         struct hstate *hstate;
152 };
153 
154 
155 struct hugetlbfs_inode_info {
156         struct shared_policy policy;
157         struct inode vfs_inode;
158 };
159 
160 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
161 {
162         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
163 }
164 
165 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
166 {
167         return sb->s_fs_info;
168 }
169 
170 extern const struct file_operations hugetlbfs_file_operations;
171 extern const struct vm_operations_struct hugetlb_vm_ops;
172 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
173                                 struct user_struct **user, int creat_flags);
174 int hugetlb_get_quota(struct address_space *mapping, long delta);
175 void hugetlb_put_quota(struct address_space *mapping, long delta);
176 
177 static inline int is_file_hugepages(struct file *file)
178 {
179         if (file->f_op == &hugetlbfs_file_operations)
180                 return 1;
181         if (is_file_shm_hugepages(file))
182                 return 1;
183 
184         return 0;
185 }
186 
187 static inline void set_file_hugepages(struct file *file)
188 {
189         file->f_op = &hugetlbfs_file_operations;
190 }
191 #else /* !CONFIG_HUGETLBFS */
192 
193 #define is_file_hugepages(file)                 0
194 #define set_file_hugepages(file)                BUG()
195 static inline struct file *hugetlb_file_setup(const char *name, size_t size,
196                 vm_flags_t acctflag, struct user_struct **user, int creat_flags)
197 {
198         return ERR_PTR(-ENOSYS);
199 }
200 
201 #endif /* !CONFIG_HUGETLBFS */
202 
203 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
204 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
205                                         unsigned long len, unsigned long pgoff,
206                                         unsigned long flags);
207 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
208 
209 #ifdef CONFIG_HUGETLB_PAGE
210 
211 #define HSTATE_NAME_LEN 32
212 /* Defines one hugetlb page size */
213 struct hstate {
214         int next_nid_to_alloc;
215         int next_nid_to_free;
216         unsigned int order;
217         unsigned long mask;
218         unsigned long max_huge_pages;
219         unsigned long nr_huge_pages;
220         unsigned long free_huge_pages;
221         unsigned long resv_huge_pages;
222         unsigned long surplus_huge_pages;
223         unsigned long nr_overcommit_huge_pages;
224         struct list_head hugepage_freelists[MAX_NUMNODES];
225         unsigned int nr_huge_pages_node[MAX_NUMNODES];
226         unsigned int free_huge_pages_node[MAX_NUMNODES];
227         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
228         char name[HSTATE_NAME_LEN];
229 };
230 
231 struct huge_bootmem_page {
232         struct list_head list;
233         struct hstate *hstate;
234 };
235 
236 struct page *alloc_huge_page_node(struct hstate *h, int nid);
237 
238 /* arch callback */
239 int __init alloc_bootmem_huge_page(struct hstate *h);
240 
241 void __init hugetlb_add_hstate(unsigned order);
242 struct hstate *size_to_hstate(unsigned long size);
243 
244 #ifndef HUGE_MAX_HSTATE
245 #define HUGE_MAX_HSTATE 1
246 #endif
247 
248 extern struct hstate hstates[HUGE_MAX_HSTATE];
249 extern unsigned int default_hstate_idx;
250 
251 #define default_hstate (hstates[default_hstate_idx])
252 
253 static inline struct hstate *hstate_inode(struct inode *i)
254 {
255         struct hugetlbfs_sb_info *hsb;
256         hsb = HUGETLBFS_SB(i->i_sb);
257         return hsb->hstate;
258 }
259 
260 static inline struct hstate *hstate_file(struct file *f)
261 {
262         return hstate_inode(f->f_dentry->d_inode);
263 }
264 
265 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
266 {
267         return hstate_file(vma->vm_file);
268 }
269 
270 static inline unsigned long huge_page_size(struct hstate *h)
271 {
272         return (unsigned long)PAGE_SIZE << h->order;
273 }
274 
275 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
276 
277 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
278 
279 static inline unsigned long huge_page_mask(struct hstate *h)
280 {
281         return h->mask;
282 }
283 
284 static inline unsigned int huge_page_order(struct hstate *h)
285 {
286         return h->order;
287 }
288 
289 static inline unsigned huge_page_shift(struct hstate *h)
290 {
291         return h->order + PAGE_SHIFT;
292 }
293 
294 static inline unsigned int pages_per_huge_page(struct hstate *h)
295 {
296         return 1 << h->order;
297 }
298 
299 static inline unsigned int blocks_per_huge_page(struct hstate *h)
300 {
301         return huge_page_size(h) / 512;
302 }
303 
304 #include <asm/hugetlb.h>
305 
306 static inline struct hstate *page_hstate(struct page *page)
307 {
308         return size_to_hstate(PAGE_SIZE << compound_order(page));
309 }
310 
311 static inline unsigned hstate_index_to_shift(unsigned index)
312 {
313         return hstates[index].order + PAGE_SHIFT;
314 }
315 
316 pgoff_t __basepage_index(struct page *page);
317 
318 /* Return page->index in PAGE_SIZE units */
319 static inline pgoff_t basepage_index(struct page *page)
320 {
321         if (!PageCompound(page))
322                 return page->index;
323 
324         return __basepage_index(page);
325 }
326 
327 #else
328 struct hstate {};
329 #define alloc_huge_page_node(h, nid) NULL
330 #define alloc_bootmem_huge_page(h) NULL
331 #define hstate_file(f) NULL
332 #define hstate_vma(v) NULL
333 #define hstate_inode(i) NULL
334 #define huge_page_size(h) PAGE_SIZE
335 #define huge_page_mask(h) PAGE_MASK
336 #define vma_kernel_pagesize(v) PAGE_SIZE
337 #define vma_mmu_pagesize(v) PAGE_SIZE
338 #define huge_page_order(h) 0
339 #define huge_page_shift(h) PAGE_SHIFT
340 static inline unsigned int pages_per_huge_page(struct hstate *h)
341 {
342         return 1;
343 }
344 #define hstate_index_to_shift(index) 0
345 
346 static inline pgoff_t basepage_index(struct page *page)
347 {
348         return page->index;
349 }
350 #endif
351 
352 #endif /* _LINUX_HUGETLB_H */
353 

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