Make hash_64() use a 64-bit multiply when appropriate
[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/mmdebug.h>
6 #include <linux/fs.h>
7 #include <linux/hugetlb_inline.h>
8 #include <linux/cgroup.h>
9 #include <linux/list.h>
10 #include <linux/kref.h>
11
12 struct ctl_table;
13 struct user_struct;
14 struct mmu_gather;
15
16 #ifdef CONFIG_HUGETLB_PAGE
17
18 #include <linux/mempolicy.h>
19 #include <linux/shm.h>
20 #include <asm/tlbflush.h>
21
22 struct hugepage_subpool {
23         spinlock_t lock;
24         long count;
25         long max_hpages, used_hpages;
26 };
27
28 struct resv_map {
29         struct kref refs;
30         spinlock_t lock;
31         struct list_head regions;
32 };
33 extern struct resv_map *resv_map_alloc(void);
34 void resv_map_release(struct kref *ref);
35
36 extern spinlock_t hugetlb_lock;
37 extern int hugetlb_max_hstate __read_mostly;
38 #define for_each_hstate(h) \
39         for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
40
41 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
42 void hugepage_put_subpool(struct hugepage_subpool *spool);
43
44 int PageHuge(struct page *page);
45
46 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
47 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
48 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
49 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
50
51 #ifdef CONFIG_NUMA
52 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
53                                         void __user *, size_t *, loff_t *);
54 #endif
55
56 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
57 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
58                          struct page **, struct vm_area_struct **,
59                          unsigned long *, unsigned long *, long, unsigned int);
60 void unmap_hugepage_range(struct vm_area_struct *,
61                           unsigned long, unsigned long, struct page *);
62 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
63                           struct vm_area_struct *vma,
64                           unsigned long start, unsigned long end,
65                           struct page *ref_page);
66 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
67                                 unsigned long start, unsigned long end,
68                                 struct page *ref_page);
69 void hugetlb_report_meminfo(struct seq_file *);
70 int hugetlb_report_node_meminfo(int, char *);
71 void hugetlb_show_meminfo(void);
72 unsigned long hugetlb_total_pages(void);
73 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
74                         unsigned long address, unsigned int flags);
75 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
76                                                 struct vm_area_struct *vma,
77                                                 vm_flags_t vm_flags);
78 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
79 int dequeue_hwpoisoned_huge_page(struct page *page);
80 bool isolate_huge_page(struct page *page, struct list_head *list);
81 void putback_active_hugepage(struct page *page);
82 bool is_hugepage_active(struct page *page);
83 void free_huge_page(struct page *page);
84
85 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
86 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
87 #endif
88
89 extern unsigned long hugepages_treat_as_movable;
90 extern int sysctl_hugetlb_shm_group;
91 extern struct list_head huge_boot_pages;
92
93 /* arch callbacks */
94
95 pte_t *huge_pte_alloc(struct mm_struct *mm,
96                         unsigned long addr, unsigned long sz);
97 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
98 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
99 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
100                               int write);
101 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
102                                 pmd_t *pmd, int write);
103 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
104                                 pud_t *pud, int write);
105 int pmd_huge(pmd_t pmd);
106 int pud_huge(pud_t pmd);
107 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
108                 unsigned long address, unsigned long end, pgprot_t newprot);
109
110 #else /* !CONFIG_HUGETLB_PAGE */
111
112 static inline int PageHuge(struct page *page)
113 {
114         return 0;
115 }
116
117 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
118 {
119 }
120
121 static inline unsigned long hugetlb_total_pages(void)
122 {
123         return 0;
124 }
125
126 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
127 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
128 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
129 static inline void hugetlb_report_meminfo(struct seq_file *m)
130 {
131 }
132 #define hugetlb_report_node_meminfo(n, buf)     0
133 static inline void hugetlb_show_meminfo(void)
134 {
135 }
136 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
137 #define follow_huge_pud(mm, addr, pud, write)   NULL
138 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
139 #define pmd_huge(x)     0
140 #define pud_huge(x)     0
141 #define is_hugepage_only_range(mm, addr, len)   0
142 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
143 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
144 #define huge_pte_offset(mm, address)    0
145 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
146 {
147         return 0;
148 }
149
150 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
151 {
152         return false;
153 }
154 #define putback_active_hugepage(p)      do {} while (0)
155 #define is_hugepage_active(x)   false
156
157 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
158                 unsigned long address, unsigned long end, pgprot_t newprot)
159 {
160         return 0;
161 }
162
163 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
164                         struct vm_area_struct *vma, unsigned long start,
165                         unsigned long end, struct page *ref_page)
166 {
167         BUG();
168 }
169
170 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
171                         struct vm_area_struct *vma, unsigned long start,
172                         unsigned long end, struct page *ref_page)
173 {
174         BUG();
175 }
176
177 #endif /* !CONFIG_HUGETLB_PAGE */
178
179 #define HUGETLB_ANON_FILE "anon_hugepage"
180
181 enum {
182         /*
183          * The file will be used as an shm file so shmfs accounting rules
184          * apply
185          */
186         HUGETLB_SHMFS_INODE     = 1,
187         /*
188          * The file is being created on the internal vfs mount and shmfs
189          * accounting rules do not apply
190          */
191         HUGETLB_ANONHUGE_INODE  = 2,
192 };
193
194 #ifdef CONFIG_HUGETLBFS
195 struct hugetlbfs_sb_info {
196         long    max_inodes;   /* inodes allowed */
197         long    free_inodes;  /* inodes free */
198         spinlock_t      stat_lock;
199         struct hstate *hstate;
200         struct hugepage_subpool *spool;
201 };
202
203 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
204 {
205         return sb->s_fs_info;
206 }
207
208 extern const struct file_operations hugetlbfs_file_operations;
209 extern const struct vm_operations_struct hugetlb_vm_ops;
210 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
211                                 struct user_struct **user, int creat_flags,
212                                 int page_size_log);
213
214 static inline int is_file_hugepages(struct file *file)
215 {
216         if (file->f_op == &hugetlbfs_file_operations)
217                 return 1;
218         if (is_file_shm_hugepages(file))
219                 return 1;
220
221         return 0;
222 }
223
224
225 #else /* !CONFIG_HUGETLBFS */
226
227 #define is_file_hugepages(file)                 0
228 static inline struct file *
229 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
230                 struct user_struct **user, int creat_flags,
231                 int page_size_log)
232 {
233         return ERR_PTR(-ENOSYS);
234 }
235
236 #endif /* !CONFIG_HUGETLBFS */
237
238 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
239 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
240                                         unsigned long len, unsigned long pgoff,
241                                         unsigned long flags);
242 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
243
244 #ifdef CONFIG_HUGETLB_PAGE
245
246 #define HSTATE_NAME_LEN 32
247 /* Defines one hugetlb page size */
248 struct hstate {
249         int next_nid_to_alloc;
250         int next_nid_to_free;
251         unsigned int order;
252         unsigned long mask;
253         unsigned long max_huge_pages;
254         unsigned long nr_huge_pages;
255         unsigned long free_huge_pages;
256         unsigned long resv_huge_pages;
257         unsigned long surplus_huge_pages;
258         unsigned long nr_overcommit_huge_pages;
259         struct list_head hugepage_activelist;
260         struct list_head hugepage_freelists[MAX_NUMNODES];
261         unsigned int nr_huge_pages_node[MAX_NUMNODES];
262         unsigned int free_huge_pages_node[MAX_NUMNODES];
263         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
264 #ifdef CONFIG_CGROUP_HUGETLB
265         /* cgroup control files */
266         struct cftype cgroup_files[5];
267 #endif
268         char name[HSTATE_NAME_LEN];
269 };
270
271 struct huge_bootmem_page {
272         struct list_head list;
273         struct hstate *hstate;
274 #ifdef CONFIG_HIGHMEM
275         phys_addr_t phys;
276 #endif
277 };
278
279 struct page *alloc_huge_page_node(struct hstate *h, int nid);
280 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
281                                 unsigned long addr, int avoid_reserve);
282
283 /* arch callback */
284 int __init alloc_bootmem_huge_page(struct hstate *h);
285
286 void __init hugetlb_add_hstate(unsigned order);
287 struct hstate *size_to_hstate(unsigned long size);
288
289 #ifndef HUGE_MAX_HSTATE
290 #define HUGE_MAX_HSTATE 1
291 #endif
292
293 extern struct hstate hstates[HUGE_MAX_HSTATE];
294 extern unsigned int default_hstate_idx;
295
296 #define default_hstate (hstates[default_hstate_idx])
297
298 static inline struct hstate *hstate_inode(struct inode *i)
299 {
300         struct hugetlbfs_sb_info *hsb;
301         hsb = HUGETLBFS_SB(i->i_sb);
302         return hsb->hstate;
303 }
304
305 static inline struct hstate *hstate_file(struct file *f)
306 {
307         return hstate_inode(file_inode(f));
308 }
309
310 static inline struct hstate *hstate_sizelog(int page_size_log)
311 {
312         if (!page_size_log)
313                 return &default_hstate;
314         return size_to_hstate(1 << page_size_log);
315 }
316
317 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
318 {
319         return hstate_file(vma->vm_file);
320 }
321
322 static inline unsigned long huge_page_size(struct hstate *h)
323 {
324         return (unsigned long)PAGE_SIZE << h->order;
325 }
326
327 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
328
329 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
330
331 static inline unsigned long huge_page_mask(struct hstate *h)
332 {
333         return h->mask;
334 }
335
336 static inline unsigned int huge_page_order(struct hstate *h)
337 {
338         return h->order;
339 }
340
341 static inline unsigned huge_page_shift(struct hstate *h)
342 {
343         return h->order + PAGE_SHIFT;
344 }
345
346 static inline bool hstate_is_gigantic(struct hstate *h)
347 {
348         return huge_page_order(h) >= MAX_ORDER;
349 }
350
351 static inline unsigned int pages_per_huge_page(struct hstate *h)
352 {
353         return 1 << h->order;
354 }
355
356 static inline unsigned int blocks_per_huge_page(struct hstate *h)
357 {
358         return huge_page_size(h) / 512;
359 }
360
361 #include <asm/hugetlb.h>
362
363 #ifndef arch_make_huge_pte
364 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
365                                        struct page *page, int writable)
366 {
367         return entry;
368 }
369 #endif
370
371 static inline struct hstate *page_hstate(struct page *page)
372 {
373         VM_BUG_ON_PAGE(!PageHuge(page), page);
374         return size_to_hstate(PAGE_SIZE << compound_order(page));
375 }
376
377 static inline unsigned hstate_index_to_shift(unsigned index)
378 {
379         return hstates[index].order + PAGE_SHIFT;
380 }
381
382 static inline int hstate_index(struct hstate *h)
383 {
384         return h - hstates;
385 }
386
387 pgoff_t __basepage_index(struct page *page);
388
389 /* Return page->index in PAGE_SIZE units */
390 static inline pgoff_t basepage_index(struct page *page)
391 {
392         if (!PageCompound(page))
393                 return page->index;
394
395         return __basepage_index(page);
396 }
397
398 extern void dissolve_free_huge_pages(unsigned long start_pfn,
399                                      unsigned long end_pfn);
400 static inline int hugepage_migration_supported(struct hstate *h)
401 {
402 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
403         return huge_page_shift(h) == PMD_SHIFT;
404 #else
405         return 0;
406 #endif
407 }
408
409 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
410                                            struct mm_struct *mm, pte_t *pte)
411 {
412         if (huge_page_size(h) == PMD_SIZE)
413                 return pmd_lockptr(mm, (pmd_t *) pte);
414         VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
415         return &mm->page_table_lock;
416 }
417
418 static inline bool hugepages_supported(void)
419 {
420         /*
421          * Some platform decide whether they support huge pages at boot
422          * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
423          * there is no such support
424          */
425         return HPAGE_SHIFT != 0;
426 }
427
428 #else   /* CONFIG_HUGETLB_PAGE */
429 struct hstate {};
430 #define alloc_huge_page_node(h, nid) NULL
431 #define alloc_huge_page_noerr(v, a, r) NULL
432 #define alloc_bootmem_huge_page(h) NULL
433 #define hstate_file(f) NULL
434 #define hstate_sizelog(s) NULL
435 #define hstate_vma(v) NULL
436 #define hstate_inode(i) NULL
437 #define page_hstate(page) NULL
438 #define huge_page_size(h) PAGE_SIZE
439 #define huge_page_mask(h) PAGE_MASK
440 #define vma_kernel_pagesize(v) PAGE_SIZE
441 #define vma_mmu_pagesize(v) PAGE_SIZE
442 #define huge_page_order(h) 0
443 #define huge_page_shift(h) PAGE_SHIFT
444 static inline unsigned int pages_per_huge_page(struct hstate *h)
445 {
446         return 1;
447 }
448 #define hstate_index_to_shift(index) 0
449 #define hstate_index(h) 0
450
451 static inline pgoff_t basepage_index(struct page *page)
452 {
453         return page->index;
454 }
455 #define dissolve_free_huge_pages(s, e)  do {} while (0)
456 #define hugepage_migration_supported(h) 0
457
458 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
459                                            struct mm_struct *mm, pte_t *pte)
460 {
461         return &mm->page_table_lock;
462 }
463 #endif  /* CONFIG_HUGETLB_PAGE */
464
465 static inline spinlock_t *huge_pte_lock(struct hstate *h,
466                                         struct mm_struct *mm, pte_t *pte)
467 {
468         spinlock_t *ptl;
469
470         ptl = huge_pte_lockptr(h, mm, pte);
471         spin_lock(ptl);
472         return ptl;
473 }
474
475 #endif /* _LINUX_HUGETLB_H */