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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/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 int 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 flags);
103 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
104                                 pud_t *pud, int flags);
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, flags)   NULL
137 #define follow_huge_pud(mm, addr, pud, flags)   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  * hugepages at page global directory. If arch support
180  * hugepages at pgd level, they need to define this.
181  */
182 #ifndef pgd_huge
183 #define pgd_huge(x)     0
184 #endif
185 
186 #ifndef pgd_write
187 static inline int pgd_write(pgd_t pgd)
188 {
189         BUG();
190         return 0;
191 }
192 #endif
193 
194 #ifndef pud_write
195 static inline int pud_write(pud_t pud)
196 {
197         BUG();
198         return 0;
199 }
200 #endif
201 
202 #ifndef is_hugepd
203 /*
204  * Some architectures requires a hugepage directory format that is
205  * required to support multiple hugepage sizes. For example
206  * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
207  * introduced the same on powerpc. This allows for a more flexible hugepage
208  * pagetable layout.
209  */
210 typedef struct { unsigned long pd; } hugepd_t;
211 #define is_hugepd(hugepd) (0)
212 #define __hugepd(x) ((hugepd_t) { (x) })
213 static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
214                               unsigned pdshift, unsigned long end,
215                               int write, struct page **pages, int *nr)
216 {
217         return 0;
218 }
219 #else
220 extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
221                        unsigned pdshift, unsigned long end,
222                        int write, struct page **pages, int *nr);
223 #endif
224 
225 #define HUGETLB_ANON_FILE "anon_hugepage"
226 
227 enum {
228         /*
229          * The file will be used as an shm file so shmfs accounting rules
230          * apply
231          */
232         HUGETLB_SHMFS_INODE     = 1,
233         /*
234          * The file is being created on the internal vfs mount and shmfs
235          * accounting rules do not apply
236          */
237         HUGETLB_ANONHUGE_INODE  = 2,
238 };
239 
240 #ifdef CONFIG_HUGETLBFS
241 struct hugetlbfs_sb_info {
242         long    max_inodes;   /* inodes allowed */
243         long    free_inodes;  /* inodes free */
244         spinlock_t      stat_lock;
245         struct hstate *hstate;
246         struct hugepage_subpool *spool;
247 };
248 
249 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
250 {
251         return sb->s_fs_info;
252 }
253 
254 extern const struct file_operations hugetlbfs_file_operations;
255 extern const struct vm_operations_struct hugetlb_vm_ops;
256 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
257                                 struct user_struct **user, int creat_flags,
258                                 int page_size_log);
259 
260 static inline int is_file_hugepages(struct file *file)
261 {
262         if (file->f_op == &hugetlbfs_file_operations)
263                 return 1;
264         if (is_file_shm_hugepages(file))
265                 return 1;
266 
267         return 0;
268 }
269 
270 
271 #else /* !CONFIG_HUGETLBFS */
272 
273 #define is_file_hugepages(file)                 0
274 static inline struct file *
275 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
276                 struct user_struct **user, int creat_flags,
277                 int page_size_log)
278 {
279         return ERR_PTR(-ENOSYS);
280 }
281 
282 #endif /* !CONFIG_HUGETLBFS */
283 
284 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
285 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
286                                         unsigned long len, unsigned long pgoff,
287                                         unsigned long flags);
288 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
289 
290 #ifdef CONFIG_HUGETLB_PAGE
291 
292 #define HSTATE_NAME_LEN 32
293 /* Defines one hugetlb page size */
294 struct hstate {
295         int next_nid_to_alloc;
296         int next_nid_to_free;
297         unsigned int order;
298         unsigned long mask;
299         unsigned long max_huge_pages;
300         unsigned long nr_huge_pages;
301         unsigned long free_huge_pages;
302         unsigned long resv_huge_pages;
303         unsigned long surplus_huge_pages;
304         unsigned long nr_overcommit_huge_pages;
305         struct list_head hugepage_activelist;
306         struct list_head hugepage_freelists[MAX_NUMNODES];
307         unsigned int nr_huge_pages_node[MAX_NUMNODES];
308         unsigned int free_huge_pages_node[MAX_NUMNODES];
309         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
310 #ifdef CONFIG_CGROUP_HUGETLB
311         /* cgroup control files */
312         struct cftype cgroup_files[5];
313 #endif
314         char name[HSTATE_NAME_LEN];
315 };
316 
317 struct huge_bootmem_page {
318         struct list_head list;
319         struct hstate *hstate;
320 #ifdef CONFIG_HIGHMEM
321         phys_addr_t phys;
322 #endif
323 };
324 
325 struct page *alloc_huge_page_node(struct hstate *h, int nid);
326 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
327                                 unsigned long addr, int avoid_reserve);
328 
329 /* arch callback */
330 int __init alloc_bootmem_huge_page(struct hstate *h);
331 
332 void __init hugetlb_add_hstate(unsigned order);
333 struct hstate *size_to_hstate(unsigned long size);
334 
335 #ifndef HUGE_MAX_HSTATE
336 #define HUGE_MAX_HSTATE 1
337 #endif
338 
339 extern struct hstate hstates[HUGE_MAX_HSTATE];
340 extern unsigned int default_hstate_idx;
341 
342 #define default_hstate (hstates[default_hstate_idx])
343 
344 static inline struct hstate *hstate_inode(struct inode *i)
345 {
346         struct hugetlbfs_sb_info *hsb;
347         hsb = HUGETLBFS_SB(i->i_sb);
348         return hsb->hstate;
349 }
350 
351 static inline struct hstate *hstate_file(struct file *f)
352 {
353         return hstate_inode(file_inode(f));
354 }
355 
356 static inline struct hstate *hstate_sizelog(int page_size_log)
357 {
358         if (!page_size_log)
359                 return &default_hstate;
360 
361         return size_to_hstate(1UL << page_size_log);
362 }
363 
364 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
365 {
366         return hstate_file(vma->vm_file);
367 }
368 
369 static inline unsigned long huge_page_size(struct hstate *h)
370 {
371         return (unsigned long)PAGE_SIZE << h->order;
372 }
373 
374 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
375 
376 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
377 
378 static inline unsigned long huge_page_mask(struct hstate *h)
379 {
380         return h->mask;
381 }
382 
383 static inline unsigned int huge_page_order(struct hstate *h)
384 {
385         return h->order;
386 }
387 
388 static inline unsigned huge_page_shift(struct hstate *h)
389 {
390         return h->order + PAGE_SHIFT;
391 }
392 
393 static inline bool hstate_is_gigantic(struct hstate *h)
394 {
395         return huge_page_order(h) >= MAX_ORDER;
396 }
397 
398 static inline unsigned int pages_per_huge_page(struct hstate *h)
399 {
400         return 1 << h->order;
401 }
402 
403 static inline unsigned int blocks_per_huge_page(struct hstate *h)
404 {
405         return huge_page_size(h) / 512;
406 }
407 
408 #include <asm/hugetlb.h>
409 
410 #ifndef arch_make_huge_pte
411 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
412                                        struct page *page, int writable)
413 {
414         return entry;
415 }
416 #endif
417 
418 static inline struct hstate *page_hstate(struct page *page)
419 {
420         VM_BUG_ON_PAGE(!PageHuge(page), page);
421         return size_to_hstate(PAGE_SIZE << compound_order(page));
422 }
423 
424 static inline unsigned hstate_index_to_shift(unsigned index)
425 {
426         return hstates[index].order + PAGE_SHIFT;
427 }
428 
429 static inline int hstate_index(struct hstate *h)
430 {
431         return h - hstates;
432 }
433 
434 pgoff_t __basepage_index(struct page *page);
435 
436 /* Return page->index in PAGE_SIZE units */
437 static inline pgoff_t basepage_index(struct page *page)
438 {
439         if (!PageCompound(page))
440                 return page->index;
441 
442         return __basepage_index(page);
443 }
444 
445 extern void dissolve_free_huge_pages(unsigned long start_pfn,
446                                      unsigned long end_pfn);
447 static inline int hugepage_migration_supported(struct hstate *h)
448 {
449 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
450         return huge_page_shift(h) == PMD_SHIFT;
451 #else
452         return 0;
453 #endif
454 }
455 
456 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
457                                            struct mm_struct *mm, pte_t *pte)
458 {
459         if (huge_page_size(h) == PMD_SIZE)
460                 return pmd_lockptr(mm, (pmd_t *) pte);
461         VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
462         return &mm->page_table_lock;
463 }
464 
465 static inline bool hugepages_supported(void)
466 {
467         /*
468          * Some platform decide whether they support huge pages at boot
469          * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
470          * there is no such support
471          */
472         return HPAGE_SHIFT != 0;
473 }
474 
475 #else   /* CONFIG_HUGETLB_PAGE */
476 struct hstate {};
477 #define alloc_huge_page_node(h, nid) NULL
478 #define alloc_huge_page_noerr(v, a, r) NULL
479 #define alloc_bootmem_huge_page(h) NULL
480 #define hstate_file(f) NULL
481 #define hstate_sizelog(s) NULL
482 #define hstate_vma(v) NULL
483 #define hstate_inode(i) NULL
484 #define page_hstate(page) NULL
485 #define huge_page_size(h) PAGE_SIZE
486 #define huge_page_mask(h) PAGE_MASK
487 #define vma_kernel_pagesize(v) PAGE_SIZE
488 #define vma_mmu_pagesize(v) PAGE_SIZE
489 #define huge_page_order(h) 0
490 #define huge_page_shift(h) PAGE_SHIFT
491 static inline unsigned int pages_per_huge_page(struct hstate *h)
492 {
493         return 1;
494 }
495 #define hstate_index_to_shift(index) 0
496 #define hstate_index(h) 0
497 
498 static inline pgoff_t basepage_index(struct page *page)
499 {
500         return page->index;
501 }
502 #define dissolve_free_huge_pages(s, e)  do {} while (0)
503 #define hugepage_migration_supported(h) 0
504 
505 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
506                                            struct mm_struct *mm, pte_t *pte)
507 {
508         return &mm->page_table_lock;
509 }
510 #endif  /* CONFIG_HUGETLB_PAGE */
511 
512 static inline spinlock_t *huge_pte_lock(struct hstate *h,
513                                         struct mm_struct *mm, pte_t *pte)
514 {
515         spinlock_t *ptl;
516 
517         ptl = huge_pte_lockptr(h, mm, pte);
518         spin_lock(ptl);
519         return ptl;
520 }
521 
522 #endif /* _LINUX_HUGETLB_H */
523 

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