include/linux/hugetlb.h: make isolate_huge_page() an inline
[pandora-kernel.git] / include / linux / hugetlb.h
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 int PageHeadHuge(struct page *page_head);
35
36 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
37 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
38 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
39 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
40
41 #ifdef CONFIG_NUMA
42 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
43                                         void __user *, size_t *, loff_t *);
44 #endif
45
46 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
47 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
48                          struct page **, struct vm_area_struct **,
49                          unsigned long *, unsigned long *, long, unsigned int);
50 void unmap_hugepage_range(struct vm_area_struct *,
51                           unsigned long, unsigned long, struct page *);
52 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
53                           struct vm_area_struct *vma,
54                           unsigned long start, unsigned long end,
55                           struct page *ref_page);
56 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
57                                 unsigned long start, unsigned long end,
58                                 struct page *ref_page);
59 void hugetlb_report_meminfo(struct seq_file *);
60 int hugetlb_report_node_meminfo(int, char *);
61 void hugetlb_show_meminfo(void);
62 unsigned long hugetlb_total_pages(void);
63 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
64                         unsigned long address, unsigned int flags);
65 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
66                                                 struct vm_area_struct *vma,
67                                                 vm_flags_t vm_flags);
68 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
69 int dequeue_hwpoisoned_huge_page(struct page *page);
70 bool isolate_huge_page(struct page *page, struct list_head *list);
71 void putback_active_hugepage(struct page *page);
72 bool is_hugepage_active(struct page *page);
73
74 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
75 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
76 #endif
77
78 extern unsigned long hugepages_treat_as_movable;
79 extern const unsigned long hugetlb_zero, hugetlb_infinity;
80 extern int sysctl_hugetlb_shm_group;
81 extern struct list_head huge_boot_pages;
82
83 /* arch callbacks */
84
85 pte_t *huge_pte_alloc(struct mm_struct *mm,
86                         unsigned long addr, unsigned long sz);
87 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
88 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
89 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
90                               int write);
91 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
92                                 pmd_t *pmd, int write);
93 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
94                                 pud_t *pud, int write);
95 int pmd_huge(pmd_t pmd);
96 int pud_huge(pud_t pmd);
97 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
98                 unsigned long address, unsigned long end, pgprot_t newprot);
99
100 #else /* !CONFIG_HUGETLB_PAGE */
101
102 static inline int PageHuge(struct page *page)
103 {
104         return 0;
105 }
106
107 static inline int PageHeadHuge(struct page *page_head)
108 {
109         return 0;
110 }
111
112 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
113 {
114 }
115
116 static inline unsigned long hugetlb_total_pages(void)
117 {
118         return 0;
119 }
120
121 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
122 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
123 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
124 static inline void hugetlb_report_meminfo(struct seq_file *m)
125 {
126 }
127 #define hugetlb_report_node_meminfo(n, buf)     0
128 static inline void hugetlb_show_meminfo(void)
129 {
130 }
131 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
132 #define follow_huge_pud(mm, addr, pud, write)   NULL
133 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
134 #define pmd_huge(x)     0
135 #define pud_huge(x)     0
136 #define is_hugepage_only_range(mm, addr, len)   0
137 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
138 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
139 #define huge_pte_offset(mm, address)    0
140 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
141 {
142         return 0;
143 }
144
145 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
146 {
147         return false;
148 }
149 #define putback_active_hugepage(p)      do {} while (0)
150 #define is_hugepage_active(x)   false
151
152 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
153                 unsigned long address, unsigned long end, pgprot_t newprot)
154 {
155         return 0;
156 }
157
158 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
159                         struct vm_area_struct *vma, unsigned long start,
160                         unsigned long end, struct page *ref_page)
161 {
162         BUG();
163 }
164
165 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
166                         struct vm_area_struct *vma, unsigned long start,
167                         unsigned long end, struct page *ref_page)
168 {
169         BUG();
170 }
171
172 #endif /* !CONFIG_HUGETLB_PAGE */
173
174 #define HUGETLB_ANON_FILE "anon_hugepage"
175
176 enum {
177         /*
178          * The file will be used as an shm file so shmfs accounting rules
179          * apply
180          */
181         HUGETLB_SHMFS_INODE     = 1,
182         /*
183          * The file is being created on the internal vfs mount and shmfs
184          * accounting rules do not apply
185          */
186         HUGETLB_ANONHUGE_INODE  = 2,
187 };
188
189 #ifdef CONFIG_HUGETLBFS
190 struct hugetlbfs_sb_info {
191         long    max_inodes;   /* inodes allowed */
192         long    free_inodes;  /* inodes free */
193         spinlock_t      stat_lock;
194         struct hstate *hstate;
195         struct hugepage_subpool *spool;
196 };
197
198 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
199 {
200         return sb->s_fs_info;
201 }
202
203 extern const struct file_operations hugetlbfs_file_operations;
204 extern const struct vm_operations_struct hugetlb_vm_ops;
205 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
206                                 struct user_struct **user, int creat_flags,
207                                 int page_size_log);
208
209 static inline int is_file_hugepages(struct file *file)
210 {
211         if (file->f_op == &hugetlbfs_file_operations)
212                 return 1;
213         if (is_file_shm_hugepages(file))
214                 return 1;
215
216         return 0;
217 }
218
219
220 #else /* !CONFIG_HUGETLBFS */
221
222 #define is_file_hugepages(file)                 0
223 static inline struct file *
224 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
225                 struct user_struct **user, int creat_flags,
226                 int page_size_log)
227 {
228         return ERR_PTR(-ENOSYS);
229 }
230
231 #endif /* !CONFIG_HUGETLBFS */
232
233 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
234 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
235                                         unsigned long len, unsigned long pgoff,
236                                         unsigned long flags);
237 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
238
239 #ifdef CONFIG_HUGETLB_PAGE
240
241 #define HSTATE_NAME_LEN 32
242 /* Defines one hugetlb page size */
243 struct hstate {
244         int next_nid_to_alloc;
245         int next_nid_to_free;
246         unsigned int order;
247         unsigned long mask;
248         unsigned long max_huge_pages;
249         unsigned long nr_huge_pages;
250         unsigned long free_huge_pages;
251         unsigned long resv_huge_pages;
252         unsigned long surplus_huge_pages;
253         unsigned long nr_overcommit_huge_pages;
254         struct list_head hugepage_activelist;
255         struct list_head hugepage_freelists[MAX_NUMNODES];
256         unsigned int nr_huge_pages_node[MAX_NUMNODES];
257         unsigned int free_huge_pages_node[MAX_NUMNODES];
258         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
259 #ifdef CONFIG_CGROUP_HUGETLB
260         /* cgroup control files */
261         struct cftype cgroup_files[5];
262 #endif
263         char name[HSTATE_NAME_LEN];
264 };
265
266 struct huge_bootmem_page {
267         struct list_head list;
268         struct hstate *hstate;
269 #ifdef CONFIG_HIGHMEM
270         phys_addr_t phys;
271 #endif
272 };
273
274 struct page *alloc_huge_page_node(struct hstate *h, int nid);
275 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
276                                 unsigned long addr, int avoid_reserve);
277
278 /* arch callback */
279 int __init alloc_bootmem_huge_page(struct hstate *h);
280
281 void __init hugetlb_add_hstate(unsigned order);
282 struct hstate *size_to_hstate(unsigned long size);
283
284 #ifndef HUGE_MAX_HSTATE
285 #define HUGE_MAX_HSTATE 1
286 #endif
287
288 extern struct hstate hstates[HUGE_MAX_HSTATE];
289 extern unsigned int default_hstate_idx;
290
291 #define default_hstate (hstates[default_hstate_idx])
292
293 static inline struct hstate *hstate_inode(struct inode *i)
294 {
295         struct hugetlbfs_sb_info *hsb;
296         hsb = HUGETLBFS_SB(i->i_sb);
297         return hsb->hstate;
298 }
299
300 static inline struct hstate *hstate_file(struct file *f)
301 {
302         return hstate_inode(file_inode(f));
303 }
304
305 static inline struct hstate *hstate_sizelog(int page_size_log)
306 {
307         if (!page_size_log)
308                 return &default_hstate;
309         return size_to_hstate(1 << page_size_log);
310 }
311
312 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
313 {
314         return hstate_file(vma->vm_file);
315 }
316
317 static inline unsigned long huge_page_size(struct hstate *h)
318 {
319         return (unsigned long)PAGE_SIZE << h->order;
320 }
321
322 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
323
324 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
325
326 static inline unsigned long huge_page_mask(struct hstate *h)
327 {
328         return h->mask;
329 }
330
331 static inline unsigned int huge_page_order(struct hstate *h)
332 {
333         return h->order;
334 }
335
336 static inline unsigned huge_page_shift(struct hstate *h)
337 {
338         return h->order + PAGE_SHIFT;
339 }
340
341 static inline unsigned int pages_per_huge_page(struct hstate *h)
342 {
343         return 1 << h->order;
344 }
345
346 static inline unsigned int blocks_per_huge_page(struct hstate *h)
347 {
348         return huge_page_size(h) / 512;
349 }
350
351 #include <asm/hugetlb.h>
352
353 #ifndef arch_make_huge_pte
354 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
355                                        struct page *page, int writable)
356 {
357         return entry;
358 }
359 #endif
360
361 static inline struct hstate *page_hstate(struct page *page)
362 {
363         return size_to_hstate(PAGE_SIZE << compound_order(page));
364 }
365
366 static inline unsigned hstate_index_to_shift(unsigned index)
367 {
368         return hstates[index].order + PAGE_SHIFT;
369 }
370
371 static inline int hstate_index(struct hstate *h)
372 {
373         return h - hstates;
374 }
375
376 pgoff_t __basepage_index(struct page *page);
377
378 /* Return page->index in PAGE_SIZE units */
379 static inline pgoff_t basepage_index(struct page *page)
380 {
381         if (!PageCompound(page))
382                 return page->index;
383
384         return __basepage_index(page);
385 }
386
387 extern void dissolve_free_huge_pages(unsigned long start_pfn,
388                                      unsigned long end_pfn);
389 int pmd_huge_support(void);
390 /*
391  * Currently hugepage migration is enabled only for pmd-based hugepage.
392  * This function will be updated when hugepage migration is more widely
393  * supported.
394  */
395 static inline int hugepage_migration_support(struct hstate *h)
396 {
397         return pmd_huge_support() && (huge_page_shift(h) == PMD_SHIFT);
398 }
399
400 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
401                                            struct mm_struct *mm, pte_t *pte)
402 {
403         if (huge_page_size(h) == PMD_SIZE)
404                 return pmd_lockptr(mm, (pmd_t *) pte);
405         VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
406         return &mm->page_table_lock;
407 }
408
409 #else   /* CONFIG_HUGETLB_PAGE */
410 struct hstate {};
411 #define alloc_huge_page_node(h, nid) NULL
412 #define alloc_huge_page_noerr(v, a, r) NULL
413 #define alloc_bootmem_huge_page(h) NULL
414 #define hstate_file(f) NULL
415 #define hstate_sizelog(s) NULL
416 #define hstate_vma(v) NULL
417 #define hstate_inode(i) NULL
418 #define page_hstate(page) NULL
419 #define huge_page_size(h) PAGE_SIZE
420 #define huge_page_mask(h) PAGE_MASK
421 #define vma_kernel_pagesize(v) PAGE_SIZE
422 #define vma_mmu_pagesize(v) PAGE_SIZE
423 #define huge_page_order(h) 0
424 #define huge_page_shift(h) PAGE_SHIFT
425 static inline unsigned int pages_per_huge_page(struct hstate *h)
426 {
427         return 1;
428 }
429 #define hstate_index_to_shift(index) 0
430 #define hstate_index(h) 0
431
432 static inline pgoff_t basepage_index(struct page *page)
433 {
434         return page->index;
435 }
436 #define dissolve_free_huge_pages(s, e)  do {} while (0)
437 #define pmd_huge_support()      0
438 #define hugepage_migration_support(h)   0
439
440 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
441                                            struct mm_struct *mm, pte_t *pte)
442 {
443         return &mm->page_table_lock;
444 }
445 #endif  /* CONFIG_HUGETLB_PAGE */
446
447 static inline spinlock_t *huge_pte_lock(struct hstate *h,
448                                         struct mm_struct *mm, pte_t *pte)
449 {
450         spinlock_t *ptl;
451
452         ptl = huge_pte_lockptr(h, mm, pte);
453         spin_lock(ptl);
454         return ptl;
455 }
456
457 #endif /* _LINUX_HUGETLB_H */