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
19
20
21
22
23
24
25
26typedef struct { unsigned long pd; } hugepd_t;
27#define is_hugepd(hugepd) (0)
28#define __hugepd(x) ((hugepd_t) { (x) })
29static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
30 unsigned pdshift, unsigned long end,
31 int write, struct page **pages, int *nr)
32{
33 return 0;
34}
35#else
36extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
37 unsigned pdshift, unsigned long end,
38 int write, struct page **pages, int *nr);
39#endif
40
41
42#ifdef CONFIG_HUGETLB_PAGE
43
44#include <linux/mempolicy.h>
45#include <linux/shm.h>
46#include <asm/tlbflush.h>
47
48struct hugepage_subpool {
49 spinlock_t lock;
50 long count;
51 long max_hpages;
52 long used_hpages;
53
54 struct hstate *hstate;
55 long min_hpages;
56 long rsv_hpages;
57
58};
59
60struct resv_map {
61 struct kref refs;
62 spinlock_t lock;
63 struct list_head regions;
64 long adds_in_progress;
65 struct list_head region_cache;
66 long region_cache_count;
67};
68extern struct resv_map *resv_map_alloc(void);
69void resv_map_release(struct kref *ref);
70
71extern spinlock_t hugetlb_lock;
72extern int hugetlb_max_hstate __read_mostly;
73#define for_each_hstate(h) \
74 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
75
76struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
77 long min_hpages);
78void hugepage_put_subpool(struct hugepage_subpool *spool);
79
80void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
81int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
82int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
83int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
84
85#ifdef CONFIG_NUMA
86int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
87 void __user *, size_t *, loff_t *);
88#endif
89
90int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
91long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
92 struct page **, struct vm_area_struct **,
93 unsigned long *, unsigned long *, long, unsigned int,
94 int *);
95void unmap_hugepage_range(struct vm_area_struct *,
96 unsigned long, unsigned long, struct page *);
97void __unmap_hugepage_range_final(struct mmu_gather *tlb,
98 struct vm_area_struct *vma,
99 unsigned long start, unsigned long end,
100 struct page *ref_page);
101void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
102 unsigned long start, unsigned long end,
103 struct page *ref_page);
104void hugetlb_report_meminfo(struct seq_file *);
105int hugetlb_report_node_meminfo(int, char *);
106void hugetlb_show_meminfo(void);
107unsigned long hugetlb_total_pages(void);
108int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
109 unsigned long address, unsigned int flags);
110int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
111 struct vm_area_struct *dst_vma,
112 unsigned long dst_addr,
113 unsigned long src_addr,
114 struct page **pagep);
115int hugetlb_reserve_pages(struct inode *inode, long from, long to,
116 struct vm_area_struct *vma,
117 vm_flags_t vm_flags);
118long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
119 long freed);
120bool isolate_huge_page(struct page *page, struct list_head *list);
121void putback_active_hugepage(struct page *page);
122void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
123void free_huge_page(struct page *page);
124void hugetlb_fix_reserve_counts(struct inode *inode);
125extern struct mutex *hugetlb_fault_mutex_table;
126u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
127 struct vm_area_struct *vma,
128 struct address_space *mapping,
129 pgoff_t idx, unsigned long address);
130
131pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
132
133extern int sysctl_hugetlb_shm_group;
134extern struct list_head huge_boot_pages;
135
136
137
138pte_t *huge_pte_alloc(struct mm_struct *mm,
139 unsigned long addr, unsigned long sz);
140pte_t *huge_pte_offset(struct mm_struct *mm,
141 unsigned long addr, unsigned long sz);
142int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
143struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
144 int write);
145struct page *follow_huge_pd(struct vm_area_struct *vma,
146 unsigned long address, hugepd_t hpd,
147 int flags, int pdshift);
148struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
149 pmd_t *pmd, int flags);
150struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
151 pud_t *pud, int flags);
152struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
153 pgd_t *pgd, int flags);
154
155int pmd_huge(pmd_t pmd);
156int pud_huge(pud_t pud);
157unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
158 unsigned long address, unsigned long end, pgprot_t newprot);
159
160bool is_hugetlb_entry_migration(pte_t pte);
161
162#else
163
164static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
165{
166}
167
168static inline unsigned long hugetlb_total_pages(void)
169{
170 return 0;
171}
172
173#define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
174#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
175#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
176static inline void hugetlb_report_meminfo(struct seq_file *m)
177{
178}
179#define hugetlb_report_node_meminfo(n, buf) 0
180static inline void hugetlb_show_meminfo(void)
181{
182}
183#define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
184#define follow_huge_pmd(mm, addr, pmd, flags) NULL
185#define follow_huge_pud(mm, addr, pud, flags) NULL
186#define follow_huge_pgd(mm, addr, pgd, flags) NULL
187#define prepare_hugepage_range(file, addr, len) (-EINVAL)
188#define pmd_huge(x) 0
189#define pud_huge(x) 0
190#define is_hugepage_only_range(mm, addr, len) 0
191#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
192#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
193#define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
194 src_addr, pagep) ({ BUG(); 0; })
195#define huge_pte_offset(mm, address, sz) 0
196
197static inline bool isolate_huge_page(struct page *page, struct list_head *list)
198{
199 return false;
200}
201#define putback_active_hugepage(p) do {} while (0)
202#define move_hugetlb_state(old, new, reason) do {} while (0)
203
204static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
205 unsigned long address, unsigned long end, pgprot_t newprot)
206{
207 return 0;
208}
209
210static inline void __unmap_hugepage_range_final(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}
216
217static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
218 struct vm_area_struct *vma, unsigned long start,
219 unsigned long end, struct page *ref_page)
220{
221 BUG();
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#ifdef CONFIG_HIGHMEM
352 phys_addr_t phys;
353#endif
354};
355
356struct page *alloc_huge_page(struct vm_area_struct *vma,
357 unsigned long addr, int avoid_reserve);
358struct page *alloc_huge_page_node(struct hstate *h, int nid);
359struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
360 nodemask_t *nmask);
361struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
362 unsigned long address);
363int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
364 pgoff_t idx);
365
366
367int __init __alloc_bootmem_huge_page(struct hstate *h);
368int __init alloc_bootmem_huge_page(struct hstate *h);
369
370void __init hugetlb_bad_size(void);
371void __init hugetlb_add_hstate(unsigned order);
372struct hstate *size_to_hstate(unsigned long size);
373
374#ifndef HUGE_MAX_HSTATE
375#define HUGE_MAX_HSTATE 1
376#endif
377
378extern struct hstate hstates[HUGE_MAX_HSTATE];
379extern unsigned int default_hstate_idx;
380
381#define default_hstate (hstates[default_hstate_idx])
382
383static inline struct hstate *hstate_inode(struct inode *i)
384{
385 return HUGETLBFS_SB(i->i_sb)->hstate;
386}
387
388static inline struct hstate *hstate_file(struct file *f)
389{
390 return hstate_inode(file_inode(f));
391}
392
393static inline struct hstate *hstate_sizelog(int page_size_log)
394{
395 if (!page_size_log)
396 return &default_hstate;
397
398 return size_to_hstate(1UL << page_size_log);
399}
400
401static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
402{
403 return hstate_file(vma->vm_file);
404}
405
406static inline unsigned long huge_page_size(struct hstate *h)
407{
408 return (unsigned long)PAGE_SIZE << h->order;
409}
410
411extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
412
413extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
414
415static inline unsigned long huge_page_mask(struct hstate *h)
416{
417 return h->mask;
418}
419
420static inline unsigned int huge_page_order(struct hstate *h)
421{
422 return h->order;
423}
424
425static inline unsigned huge_page_shift(struct hstate *h)
426{
427 return h->order + PAGE_SHIFT;
428}
429
430static inline bool hstate_is_gigantic(struct hstate *h)
431{
432 return huge_page_order(h) >= MAX_ORDER;
433}
434
435static inline unsigned int pages_per_huge_page(struct hstate *h)
436{
437 return 1 << h->order;
438}
439
440static inline unsigned int blocks_per_huge_page(struct hstate *h)
441{
442 return huge_page_size(h) / 512;
443}
444
445#include <asm/hugetlb.h>
446
447#ifndef arch_make_huge_pte
448static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
449 struct page *page, int writable)
450{
451 return entry;
452}
453#endif
454
455static inline struct hstate *page_hstate(struct page *page)
456{
457 VM_BUG_ON_PAGE(!PageHuge(page), page);
458 return size_to_hstate(PAGE_SIZE << compound_order(page));
459}
460
461static inline unsigned hstate_index_to_shift(unsigned index)
462{
463 return hstates[index].order + PAGE_SHIFT;
464}
465
466static inline int hstate_index(struct hstate *h)
467{
468 return h - hstates;
469}
470
471pgoff_t __basepage_index(struct page *page);
472
473
474static inline pgoff_t basepage_index(struct page *page)
475{
476 if (!PageCompound(page))
477 return page->index;
478
479 return __basepage_index(page);
480}
481
482extern int dissolve_free_huge_page(struct page *page);
483extern int dissolve_free_huge_pages(unsigned long start_pfn,
484 unsigned long end_pfn);
485static inline bool hugepage_migration_supported(struct hstate *h)
486{
487#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
488 if ((huge_page_shift(h) == PMD_SHIFT) ||
489 (huge_page_shift(h) == PGDIR_SHIFT))
490 return true;
491 else
492 return false;
493#else
494 return false;
495#endif
496}
497
498static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
499 struct mm_struct *mm, pte_t *pte)
500{
501 if (huge_page_size(h) == PMD_SIZE)
502 return pmd_lockptr(mm, (pmd_t *) pte);
503 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
504 return &mm->page_table_lock;
505}
506
507#ifndef hugepages_supported
508
509
510
511
512
513#define hugepages_supported() (HPAGE_SHIFT != 0)
514#endif
515
516void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
517
518static inline void hugetlb_count_add(long l, struct mm_struct *mm)
519{
520 atomic_long_add(l, &mm->hugetlb_usage);
521}
522
523static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
524{
525 atomic_long_sub(l, &mm->hugetlb_usage);
526}
527
528#ifndef set_huge_swap_pte_at
529static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
530 pte_t *ptep, pte_t pte, unsigned long sz)
531{
532 set_huge_pte_at(mm, addr, ptep, pte);
533}
534#endif
535#else
536struct hstate {};
537#define alloc_huge_page(v, a, r) NULL
538#define alloc_huge_page_node(h, nid) NULL
539#define alloc_huge_page_nodemask(h, preferred_nid, nmask) NULL
540#define alloc_huge_page_vma(h, vma, address) NULL
541#define alloc_bootmem_huge_page(h) NULL
542#define hstate_file(f) NULL
543#define hstate_sizelog(s) NULL
544#define hstate_vma(v) NULL
545#define hstate_inode(i) NULL
546#define page_hstate(page) NULL
547#define huge_page_size(h) PAGE_SIZE
548#define huge_page_mask(h) PAGE_MASK
549#define vma_kernel_pagesize(v) PAGE_SIZE
550#define vma_mmu_pagesize(v) PAGE_SIZE
551#define huge_page_order(h) 0
552#define huge_page_shift(h) PAGE_SHIFT
553static inline bool hstate_is_gigantic(struct hstate *h)
554{
555 return false;
556}
557
558static inline unsigned int pages_per_huge_page(struct hstate *h)
559{
560 return 1;
561}
562
563static inline unsigned hstate_index_to_shift(unsigned index)
564{
565 return 0;
566}
567
568static inline int hstate_index(struct hstate *h)
569{
570 return 0;
571}
572
573static inline pgoff_t basepage_index(struct page *page)
574{
575 return page->index;
576}
577
578static inline int dissolve_free_huge_page(struct page *page)
579{
580 return 0;
581}
582
583static inline int dissolve_free_huge_pages(unsigned long start_pfn,
584 unsigned long end_pfn)
585{
586 return 0;
587}
588
589static inline bool hugepage_migration_supported(struct hstate *h)
590{
591 return false;
592}
593
594static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
595 struct mm_struct *mm, pte_t *pte)
596{
597 return &mm->page_table_lock;
598}
599
600static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
601{
602}
603
604static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
605{
606}
607
608static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
609 pte_t *ptep, pte_t pte, unsigned long sz)
610{
611}
612#endif
613
614static inline spinlock_t *huge_pte_lock(struct hstate *h,
615 struct mm_struct *mm, pte_t *pte)
616{
617 spinlock_t *ptl;
618
619 ptl = huge_pte_lockptr(h, mm, pte);
620 spin_lock(ptl);
621 return ptl;
622}
623
624#endif
625