1
2#ifndef _LINUX_HUGETLB_H
3#define _LINUX_HUGETLB_H
4
5#include <linux/mm_types.h>
6#include <linux/mmdebug.h>
7#include <linux/fs.h>
8#include <linux/hugetlb_inline.h>
9#include <linux/cgroup.h>
10#include <linux/list.h>
11#include <linux/kref.h>
12#include <asm/pgtable.h>
13
14struct ctl_table;
15struct user_struct;
16struct mmu_gather;
17
18#ifndef is_hugepd
19typedef struct { unsigned long pd; } hugepd_t;
20#define is_hugepd(hugepd) (0)
21#define __hugepd(x) ((hugepd_t) { (x) })
22#endif
23
24#ifdef CONFIG_HUGETLB_PAGE
25
26#include <linux/mempolicy.h>
27#include <linux/shm.h>
28#include <asm/tlbflush.h>
29
30struct hugepage_subpool {
31 spinlock_t lock;
32 long count;
33 long max_hpages;
34 long used_hpages;
35
36 struct hstate *hstate;
37 long min_hpages;
38 long rsv_hpages;
39
40};
41
42struct resv_map {
43 struct kref refs;
44 spinlock_t lock;
45 struct list_head regions;
46 long adds_in_progress;
47 struct list_head region_cache;
48 long region_cache_count;
49};
50extern struct resv_map *resv_map_alloc(void);
51void resv_map_release(struct kref *ref);
52
53extern spinlock_t hugetlb_lock;
54extern int hugetlb_max_hstate __read_mostly;
55#define for_each_hstate(h) \
56 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
57
58struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
59 long min_hpages);
60void hugepage_put_subpool(struct hugepage_subpool *spool);
61
62void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
63int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
64int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
65int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
66
67#ifdef CONFIG_NUMA
68int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
69 void __user *, size_t *, loff_t *);
70#endif
71
72int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
73long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
74 struct page **, struct vm_area_struct **,
75 unsigned long *, unsigned long *, long, unsigned int,
76 int *);
77void unmap_hugepage_range(struct vm_area_struct *,
78 unsigned long, unsigned long, struct page *);
79void __unmap_hugepage_range_final(struct mmu_gather *tlb,
80 struct vm_area_struct *vma,
81 unsigned long start, unsigned long end,
82 struct page *ref_page);
83void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
84 unsigned long start, unsigned long end,
85 struct page *ref_page);
86void hugetlb_report_meminfo(struct seq_file *);
87int hugetlb_report_node_meminfo(int, char *);
88void hugetlb_show_meminfo(void);
89unsigned long hugetlb_total_pages(void);
90vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
91 unsigned long address, unsigned int flags);
92int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
93 struct vm_area_struct *dst_vma,
94 unsigned long dst_addr,
95 unsigned long src_addr,
96 struct page **pagep);
97int hugetlb_reserve_pages(struct inode *inode, long from, long to,
98 struct vm_area_struct *vma,
99 vm_flags_t vm_flags);
100long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
101 long freed);
102bool isolate_huge_page(struct page *page, struct list_head *list);
103void putback_active_hugepage(struct page *page);
104void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
105void free_huge_page(struct page *page);
106void hugetlb_fix_reserve_counts(struct inode *inode);
107extern struct mutex *hugetlb_fault_mutex_table;
108u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
109 pgoff_t idx, unsigned long address);
110
111pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
112
113extern int sysctl_hugetlb_shm_group;
114extern struct list_head huge_boot_pages;
115
116
117
118pte_t *huge_pte_alloc(struct mm_struct *mm,
119 unsigned long addr, unsigned long sz);
120pte_t *huge_pte_offset(struct mm_struct *mm,
121 unsigned long addr, unsigned long sz);
122int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
123void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
124 unsigned long *start, unsigned long *end);
125struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
126 int write);
127struct page *follow_huge_pd(struct vm_area_struct *vma,
128 unsigned long address, hugepd_t hpd,
129 int flags, int pdshift);
130struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
131 pmd_t *pmd, int flags);
132struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
133 pud_t *pud, int flags);
134struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
135 pgd_t *pgd, int flags);
136
137int pmd_huge(pmd_t pmd);
138int pud_huge(pud_t pud);
139unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
140 unsigned long address, unsigned long end, pgprot_t newprot);
141
142bool is_hugetlb_entry_migration(pte_t pte);
143
144#else
145
146static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
147{
148}
149
150static inline unsigned long hugetlb_total_pages(void)
151{
152 return 0;
153}
154
155static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
156 pte_t *ptep)
157{
158 return 0;
159}
160
161static inline void adjust_range_if_pmd_sharing_possible(
162 struct vm_area_struct *vma,
163 unsigned long *start, unsigned long *end)
164{
165}
166
167#define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
168#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
169#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
170static inline void hugetlb_report_meminfo(struct seq_file *m)
171{
172}
173#define hugetlb_report_node_meminfo(n, buf) 0
174static inline void hugetlb_show_meminfo(void)
175{
176}
177#define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
178#define follow_huge_pmd(mm, addr, pmd, flags) NULL
179#define follow_huge_pud(mm, addr, pud, flags) NULL
180#define follow_huge_pgd(mm, addr, pgd, flags) NULL
181#define prepare_hugepage_range(file, addr, len) (-EINVAL)
182#define pmd_huge(x) 0
183#define pud_huge(x) 0
184#define is_hugepage_only_range(mm, addr, len) 0
185#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
186#define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
187 src_addr, pagep) ({ BUG(); 0; })
188#define huge_pte_offset(mm, address, sz) 0
189
190static inline bool isolate_huge_page(struct page *page, struct list_head *list)
191{
192 return false;
193}
194#define putback_active_hugepage(p) do {} while (0)
195#define move_hugetlb_state(old, new, reason) do {} while (0)
196
197static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
198 unsigned long address, unsigned long end, pgprot_t newprot)
199{
200 return 0;
201}
202
203static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
204 struct vm_area_struct *vma, unsigned long start,
205 unsigned long end, struct page *ref_page)
206{
207 BUG();
208}
209
210static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
211 struct vm_area_struct *vma, unsigned long start,
212 unsigned long end, struct page *ref_page)
213{
214 BUG();
215}
216static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
217 struct vm_area_struct *vma, unsigned long address,
218 unsigned int flags)
219{
220 BUG();
221 return 0;
222}
223
224#endif
225
226
227
228
229#ifndef pgd_huge
230#define pgd_huge(x) 0
231#endif
232#ifndef p4d_huge
233#define p4d_huge(x) 0
234#endif
235
236#ifndef pgd_write
237static inline int pgd_write(pgd_t pgd)
238{
239 BUG();
240 return 0;
241}
242#endif
243
244#define HUGETLB_ANON_FILE "anon_hugepage"
245
246enum {
247
248
249
250
251 HUGETLB_SHMFS_INODE = 1,
252
253
254
255
256 HUGETLB_ANONHUGE_INODE = 2,
257};
258
259#ifdef CONFIG_HUGETLBFS
260struct hugetlbfs_sb_info {
261 long max_inodes;
262 long free_inodes;
263 spinlock_t stat_lock;
264 struct hstate *hstate;
265 struct hugepage_subpool *spool;
266 kuid_t uid;
267 kgid_t gid;
268 umode_t mode;
269};
270
271static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
272{
273 return sb->s_fs_info;
274}
275
276struct hugetlbfs_inode_info {
277 struct shared_policy policy;
278 struct inode vfs_inode;
279 unsigned int seals;
280};
281
282static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
283{
284 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
285}
286
287extern const struct file_operations hugetlbfs_file_operations;
288extern const struct vm_operations_struct hugetlb_vm_ops;
289struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
290 struct user_struct **user, int creat_flags,
291 int page_size_log);
292
293static inline bool is_file_hugepages(struct file *file)
294{
295 if (file->f_op == &hugetlbfs_file_operations)
296 return true;
297
298 return is_file_shm_hugepages(file);
299}
300
301
302#else
303
304#define is_file_hugepages(file) false
305static inline struct file *
306hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
307 struct user_struct **user, int creat_flags,
308 int page_size_log)
309{
310 return ERR_PTR(-ENOSYS);
311}
312
313#endif
314
315#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
316unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
317 unsigned long len, unsigned long pgoff,
318 unsigned long flags);
319#endif
320
321#ifdef CONFIG_HUGETLB_PAGE
322
323#define HSTATE_NAME_LEN 32
324
325struct hstate {
326 int next_nid_to_alloc;
327 int next_nid_to_free;
328 unsigned int order;
329 unsigned long mask;
330 unsigned long max_huge_pages;
331 unsigned long nr_huge_pages;
332 unsigned long free_huge_pages;
333 unsigned long resv_huge_pages;
334 unsigned long surplus_huge_pages;
335 unsigned long nr_overcommit_huge_pages;
336 struct list_head hugepage_activelist;
337 struct list_head hugepage_freelists[MAX_NUMNODES];
338 unsigned int nr_huge_pages_node[MAX_NUMNODES];
339 unsigned int free_huge_pages_node[MAX_NUMNODES];
340 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
341#ifdef CONFIG_CGROUP_HUGETLB
342
343 struct cftype cgroup_files[5];
344#endif
345 char name[HSTATE_NAME_LEN];
346};
347
348struct huge_bootmem_page {
349 struct list_head list;
350 struct hstate *hstate;
351};
352
353struct page *alloc_huge_page(struct vm_area_struct *vma,
354 unsigned long addr, int avoid_reserve);
355struct page *alloc_huge_page_node(struct hstate *h, int nid);
356struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
357 nodemask_t *nmask);
358struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
359 unsigned long address);
360struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
361 int nid, nodemask_t *nmask);
362int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
363 pgoff_t idx);
364
365
366int __init __alloc_bootmem_huge_page(struct hstate *h);
367int __init alloc_bootmem_huge_page(struct hstate *h);
368
369void __init hugetlb_bad_size(void);
370void __init hugetlb_add_hstate(unsigned order);
371struct hstate *size_to_hstate(unsigned long size);
372
373#ifndef HUGE_MAX_HSTATE
374#define HUGE_MAX_HSTATE 1
375#endif
376
377extern struct hstate hstates[HUGE_MAX_HSTATE];
378extern unsigned int default_hstate_idx;
379
380#define default_hstate (hstates[default_hstate_idx])
381
382static inline struct hstate *hstate_inode(struct inode *i)
383{
384 return HUGETLBFS_SB(i->i_sb)->hstate;
385}
386
387static inline struct hstate *hstate_file(struct file *f)
388{
389 return hstate_inode(file_inode(f));
390}
391
392static inline struct hstate *hstate_sizelog(int page_size_log)
393{
394 if (!page_size_log)
395 return &default_hstate;
396
397 return size_to_hstate(1UL << page_size_log);
398}
399
400static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
401{
402 return hstate_file(vma->vm_file);
403}
404
405static inline unsigned long huge_page_size(struct hstate *h)
406{
407 return (unsigned long)PAGE_SIZE << h->order;
408}
409
410extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
411
412extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
413
414static inline unsigned long huge_page_mask(struct hstate *h)
415{
416 return h->mask;
417}
418
419static inline unsigned int huge_page_order(struct hstate *h)
420{
421 return h->order;
422}
423
424static inline unsigned huge_page_shift(struct hstate *h)
425{
426 return h->order + PAGE_SHIFT;
427}
428
429static inline bool hstate_is_gigantic(struct hstate *h)
430{
431 return huge_page_order(h) >= MAX_ORDER;
432}
433
434static inline unsigned int pages_per_huge_page(struct hstate *h)
435{
436 return 1 << h->order;
437}
438
439static inline unsigned int blocks_per_huge_page(struct hstate *h)
440{
441 return huge_page_size(h) / 512;
442}
443
444#include <asm/hugetlb.h>
445
446#ifndef arch_make_huge_pte
447static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
448 struct page *page, int writable)
449{
450 return entry;
451}
452#endif
453
454static inline struct hstate *page_hstate(struct page *page)
455{
456 VM_BUG_ON_PAGE(!PageHuge(page), page);
457 return size_to_hstate(PAGE_SIZE << compound_order(page));
458}
459
460static inline unsigned hstate_index_to_shift(unsigned index)
461{
462 return hstates[index].order + PAGE_SHIFT;
463}
464
465static inline int hstate_index(struct hstate *h)
466{
467 return h - hstates;
468}
469
470pgoff_t __basepage_index(struct page *page);
471
472
473static inline pgoff_t basepage_index(struct page *page)
474{
475 if (!PageCompound(page))
476 return page->index;
477
478 return __basepage_index(page);
479}
480
481extern int dissolve_free_huge_page(struct page *page);
482extern int dissolve_free_huge_pages(unsigned long start_pfn,
483 unsigned long end_pfn);
484
485#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
486#ifndef arch_hugetlb_migration_supported
487static inline bool arch_hugetlb_migration_supported(struct hstate *h)
488{
489 if ((huge_page_shift(h) == PMD_SHIFT) ||
490 (huge_page_shift(h) == PUD_SHIFT) ||
491 (huge_page_shift(h) == PGDIR_SHIFT))
492 return true;
493 else
494 return false;
495}
496#endif
497#else
498static inline bool arch_hugetlb_migration_supported(struct hstate *h)
499{
500 return false;
501}
502#endif
503
504static inline bool hugepage_migration_supported(struct hstate *h)
505{
506 return arch_hugetlb_migration_supported(h);
507}
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524static inline bool hugepage_movable_supported(struct hstate *h)
525{
526 if (!hugepage_migration_supported(h))
527 return false;
528
529 if (hstate_is_gigantic(h))
530 return false;
531 return true;
532}
533
534static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
535 struct mm_struct *mm, pte_t *pte)
536{
537 if (huge_page_size(h) == PMD_SIZE)
538 return pmd_lockptr(mm, (pmd_t *) pte);
539 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
540 return &mm->page_table_lock;
541}
542
543#ifndef hugepages_supported
544
545
546
547
548
549#define hugepages_supported() (HPAGE_SHIFT != 0)
550#endif
551
552void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
553
554static inline void hugetlb_count_add(long l, struct mm_struct *mm)
555{
556 atomic_long_add(l, &mm->hugetlb_usage);
557}
558
559static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
560{
561 atomic_long_sub(l, &mm->hugetlb_usage);
562}
563
564#ifndef set_huge_swap_pte_at
565static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
566 pte_t *ptep, pte_t pte, unsigned long sz)
567{
568 set_huge_pte_at(mm, addr, ptep, pte);
569}
570#endif
571
572#ifndef huge_ptep_modify_prot_start
573#define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
574static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
575 unsigned long addr, pte_t *ptep)
576{
577 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
578}
579#endif
580
581#ifndef huge_ptep_modify_prot_commit
582#define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
583static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
584 unsigned long addr, pte_t *ptep,
585 pte_t old_pte, pte_t pte)
586{
587 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
588}
589#endif
590
591#else
592struct hstate {};
593
594static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
595 unsigned long addr,
596 int avoid_reserve)
597{
598 return NULL;
599}
600
601static inline struct page *alloc_huge_page_node(struct hstate *h, int nid)
602{
603 return NULL;
604}
605
606static inline struct page *
607alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask)
608{
609 return NULL;
610}
611
612static inline struct page *alloc_huge_page_vma(struct hstate *h,
613 struct vm_area_struct *vma,
614 unsigned long address)
615{
616 return NULL;
617}
618
619static inline int __alloc_bootmem_huge_page(struct hstate *h)
620{
621 return 0;
622}
623
624static inline struct hstate *hstate_file(struct file *f)
625{
626 return NULL;
627}
628
629static inline struct hstate *hstate_sizelog(int page_size_log)
630{
631 return NULL;
632}
633
634static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
635{
636 return NULL;
637}
638
639static inline struct hstate *hstate_inode(struct inode *i)
640{
641 return NULL;
642}
643
644static inline struct hstate *page_hstate(struct page *page)
645{
646 return NULL;
647}
648
649static inline unsigned long huge_page_size(struct hstate *h)
650{
651 return PAGE_SIZE;
652}
653
654static inline unsigned long huge_page_mask(struct hstate *h)
655{
656 return PAGE_MASK;
657}
658
659static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
660{
661 return PAGE_SIZE;
662}
663
664static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
665{
666 return PAGE_SIZE;
667}
668
669static inline unsigned int huge_page_order(struct hstate *h)
670{
671 return 0;
672}
673
674static inline unsigned int huge_page_shift(struct hstate *h)
675{
676 return PAGE_SHIFT;
677}
678
679static inline bool hstate_is_gigantic(struct hstate *h)
680{
681 return false;
682}
683
684static inline unsigned int pages_per_huge_page(struct hstate *h)
685{
686 return 1;
687}
688
689static inline unsigned hstate_index_to_shift(unsigned index)
690{
691 return 0;
692}
693
694static inline int hstate_index(struct hstate *h)
695{
696 return 0;
697}
698
699static inline pgoff_t basepage_index(struct page *page)
700{
701 return page->index;
702}
703
704static inline int dissolve_free_huge_page(struct page *page)
705{
706 return 0;
707}
708
709static inline int dissolve_free_huge_pages(unsigned long start_pfn,
710 unsigned long end_pfn)
711{
712 return 0;
713}
714
715static inline bool hugepage_migration_supported(struct hstate *h)
716{
717 return false;
718}
719
720static inline bool hugepage_movable_supported(struct hstate *h)
721{
722 return false;
723}
724
725static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
726 struct mm_struct *mm, pte_t *pte)
727{
728 return &mm->page_table_lock;
729}
730
731static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
732{
733}
734
735static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
736{
737}
738
739static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
740 pte_t *ptep, pte_t pte, unsigned long sz)
741{
742}
743#endif
744
745static inline spinlock_t *huge_pte_lock(struct hstate *h,
746 struct mm_struct *mm, pte_t *pte)
747{
748 spinlock_t *ptl;
749
750 ptl = huge_pte_lockptr(h, mm, pte);
751 spin_lock(ptl);
752 return ptl;
753}
754
755#endif
756