hugetlb: check for undefined shift on 32 bit architectures
[platform/kernel/linux-starfive.git] / include / linux / hugetlb.h
1 /* SPDX-License-Identifier: GPL-2.0 */
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/page_ref.h>
11 #include <linux/list.h>
12 #include <linux/kref.h>
13 #include <linux/pgtable.h>
14 #include <linux/gfp.h>
15 #include <linux/userfaultfd_k.h>
16
17 struct ctl_table;
18 struct user_struct;
19 struct mmu_gather;
20 struct node;
21
22 #ifndef CONFIG_ARCH_HAS_HUGEPD
23 typedef struct { unsigned long pd; } hugepd_t;
24 #define is_hugepd(hugepd) (0)
25 #define __hugepd(x) ((hugepd_t) { (x) })
26 #endif
27
28 #ifdef CONFIG_HUGETLB_PAGE
29
30 #include <linux/mempolicy.h>
31 #include <linux/shm.h>
32 #include <asm/tlbflush.h>
33
34 /*
35  * For HugeTLB page, there are more metadata to save in the struct page. But
36  * the head struct page cannot meet our needs, so we have to abuse other tail
37  * struct page to store the metadata.
38  */
39 #define __NR_USED_SUBPAGE 3
40
41 struct hugepage_subpool {
42         spinlock_t lock;
43         long count;
44         long max_hpages;        /* Maximum huge pages or -1 if no maximum. */
45         long used_hpages;       /* Used count against maximum, includes */
46                                 /* both allocated and reserved pages. */
47         struct hstate *hstate;
48         long min_hpages;        /* Minimum huge pages or -1 if no minimum. */
49         long rsv_hpages;        /* Pages reserved against global pool to */
50                                 /* satisfy minimum size. */
51 };
52
53 struct resv_map {
54         struct kref refs;
55         spinlock_t lock;
56         struct list_head regions;
57         long adds_in_progress;
58         struct list_head region_cache;
59         long region_cache_count;
60 #ifdef CONFIG_CGROUP_HUGETLB
61         /*
62          * On private mappings, the counter to uncharge reservations is stored
63          * here. If these fields are 0, then either the mapping is shared, or
64          * cgroup accounting is disabled for this resv_map.
65          */
66         struct page_counter *reservation_counter;
67         unsigned long pages_per_hpage;
68         struct cgroup_subsys_state *css;
69 #endif
70 };
71
72 /*
73  * Region tracking -- allows tracking of reservations and instantiated pages
74  *                    across the pages in a mapping.
75  *
76  * The region data structures are embedded into a resv_map and protected
77  * by a resv_map's lock.  The set of regions within the resv_map represent
78  * reservations for huge pages, or huge pages that have already been
79  * instantiated within the map.  The from and to elements are huge page
80  * indices into the associated mapping.  from indicates the starting index
81  * of the region.  to represents the first index past the end of  the region.
82  *
83  * For example, a file region structure with from == 0 and to == 4 represents
84  * four huge pages in a mapping.  It is important to note that the to element
85  * represents the first element past the end of the region. This is used in
86  * arithmetic as 4(to) - 0(from) = 4 huge pages in the region.
87  *
88  * Interval notation of the form [from, to) will be used to indicate that
89  * the endpoint from is inclusive and to is exclusive.
90  */
91 struct file_region {
92         struct list_head link;
93         long from;
94         long to;
95 #ifdef CONFIG_CGROUP_HUGETLB
96         /*
97          * On shared mappings, each reserved region appears as a struct
98          * file_region in resv_map. These fields hold the info needed to
99          * uncharge each reservation.
100          */
101         struct page_counter *reservation_counter;
102         struct cgroup_subsys_state *css;
103 #endif
104 };
105
106 struct hugetlb_vma_lock {
107         struct kref refs;
108         struct rw_semaphore rw_sema;
109         struct vm_area_struct *vma;
110 };
111
112 extern struct resv_map *resv_map_alloc(void);
113 void resv_map_release(struct kref *ref);
114
115 extern spinlock_t hugetlb_lock;
116 extern int hugetlb_max_hstate __read_mostly;
117 #define for_each_hstate(h) \
118         for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
119
120 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
121                                                 long min_hpages);
122 void hugepage_put_subpool(struct hugepage_subpool *spool);
123
124 void hugetlb_dup_vma_private(struct vm_area_struct *vma);
125 void clear_vma_resv_huge_pages(struct vm_area_struct *vma);
126 int hugetlb_sysctl_handler(struct ctl_table *, int, void *, size_t *, loff_t *);
127 int hugetlb_overcommit_handler(struct ctl_table *, int, void *, size_t *,
128                 loff_t *);
129 int hugetlb_treat_movable_handler(struct ctl_table *, int, void *, size_t *,
130                 loff_t *);
131 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, void *, size_t *,
132                 loff_t *);
133
134 int move_hugetlb_page_tables(struct vm_area_struct *vma,
135                              struct vm_area_struct *new_vma,
136                              unsigned long old_addr, unsigned long new_addr,
137                              unsigned long len);
138 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *,
139                             struct vm_area_struct *, struct vm_area_struct *);
140 struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
141                                 unsigned long address, unsigned int flags);
142 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
143                          struct page **, struct vm_area_struct **,
144                          unsigned long *, unsigned long *, long, unsigned int,
145                          int *);
146 void unmap_hugepage_range(struct vm_area_struct *,
147                           unsigned long, unsigned long, struct page *,
148                           zap_flags_t);
149 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
150                           struct vm_area_struct *vma,
151                           unsigned long start, unsigned long end,
152                           struct page *ref_page, zap_flags_t zap_flags);
153 void hugetlb_report_meminfo(struct seq_file *);
154 int hugetlb_report_node_meminfo(char *buf, int len, int nid);
155 void hugetlb_show_meminfo_node(int nid);
156 unsigned long hugetlb_total_pages(void);
157 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
158                         unsigned long address, unsigned int flags);
159 #ifdef CONFIG_USERFAULTFD
160 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
161                                 struct vm_area_struct *dst_vma,
162                                 unsigned long dst_addr,
163                                 unsigned long src_addr,
164                                 enum mcopy_atomic_mode mode,
165                                 struct page **pagep,
166                                 bool wp_copy);
167 #endif /* CONFIG_USERFAULTFD */
168 bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
169                                                 struct vm_area_struct *vma,
170                                                 vm_flags_t vm_flags);
171 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
172                                                 long freed);
173 int isolate_hugetlb(struct page *page, struct list_head *list);
174 int get_hwpoison_huge_page(struct page *page, bool *hugetlb, bool unpoison);
175 int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
176                                 bool *migratable_cleared);
177 void putback_active_hugepage(struct page *page);
178 void move_hugetlb_state(struct folio *old_folio, struct folio *new_folio, int reason);
179 void free_huge_page(struct page *page);
180 void hugetlb_fix_reserve_counts(struct inode *inode);
181 extern struct mutex *hugetlb_fault_mutex_table;
182 u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
183
184 pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
185                       unsigned long addr, pud_t *pud);
186
187 struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
188
189 extern int sysctl_hugetlb_shm_group;
190 extern struct list_head huge_boot_pages;
191
192 /* arch callbacks */
193
194 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
195                         unsigned long addr, unsigned long sz);
196 pte_t *huge_pte_offset(struct mm_struct *mm,
197                        unsigned long addr, unsigned long sz);
198 unsigned long hugetlb_mask_last_page(struct hstate *h);
199 int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
200                                 unsigned long addr, pte_t *ptep);
201 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
202                                 unsigned long *start, unsigned long *end);
203
204 void hugetlb_vma_lock_read(struct vm_area_struct *vma);
205 void hugetlb_vma_unlock_read(struct vm_area_struct *vma);
206 void hugetlb_vma_lock_write(struct vm_area_struct *vma);
207 void hugetlb_vma_unlock_write(struct vm_area_struct *vma);
208 int hugetlb_vma_trylock_write(struct vm_area_struct *vma);
209 void hugetlb_vma_assert_locked(struct vm_area_struct *vma);
210 void hugetlb_vma_lock_release(struct kref *kref);
211
212 int pmd_huge(pmd_t pmd);
213 int pud_huge(pud_t pud);
214 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
215                 unsigned long address, unsigned long end, pgprot_t newprot,
216                 unsigned long cp_flags);
217
218 bool is_hugetlb_entry_migration(pte_t pte);
219 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
220
221 #else /* !CONFIG_HUGETLB_PAGE */
222
223 static inline void hugetlb_dup_vma_private(struct vm_area_struct *vma)
224 {
225 }
226
227 static inline void clear_vma_resv_huge_pages(struct vm_area_struct *vma)
228 {
229 }
230
231 static inline unsigned long hugetlb_total_pages(void)
232 {
233         return 0;
234 }
235
236 static inline struct address_space *hugetlb_page_mapping_lock_write(
237                                                         struct page *hpage)
238 {
239         return NULL;
240 }
241
242 static inline int huge_pmd_unshare(struct mm_struct *mm,
243                                         struct vm_area_struct *vma,
244                                         unsigned long addr, pte_t *ptep)
245 {
246         return 0;
247 }
248
249 static inline void adjust_range_if_pmd_sharing_possible(
250                                 struct vm_area_struct *vma,
251                                 unsigned long *start, unsigned long *end)
252 {
253 }
254
255 static inline struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
256                                 unsigned long address, unsigned int flags)
257 {
258         BUILD_BUG(); /* should never be compiled in if !CONFIG_HUGETLB_PAGE*/
259 }
260
261 static inline long follow_hugetlb_page(struct mm_struct *mm,
262                         struct vm_area_struct *vma, struct page **pages,
263                         struct vm_area_struct **vmas, unsigned long *position,
264                         unsigned long *nr_pages, long i, unsigned int flags,
265                         int *nonblocking)
266 {
267         BUG();
268         return 0;
269 }
270
271 static inline int copy_hugetlb_page_range(struct mm_struct *dst,
272                                           struct mm_struct *src,
273                                           struct vm_area_struct *dst_vma,
274                                           struct vm_area_struct *src_vma)
275 {
276         BUG();
277         return 0;
278 }
279
280 static inline int move_hugetlb_page_tables(struct vm_area_struct *vma,
281                                            struct vm_area_struct *new_vma,
282                                            unsigned long old_addr,
283                                            unsigned long new_addr,
284                                            unsigned long len)
285 {
286         BUG();
287         return 0;
288 }
289
290 static inline void hugetlb_report_meminfo(struct seq_file *m)
291 {
292 }
293
294 static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
295 {
296         return 0;
297 }
298
299 static inline void hugetlb_show_meminfo_node(int nid)
300 {
301 }
302
303 static inline int prepare_hugepage_range(struct file *file,
304                                 unsigned long addr, unsigned long len)
305 {
306         return -EINVAL;
307 }
308
309 static inline void hugetlb_vma_lock_read(struct vm_area_struct *vma)
310 {
311 }
312
313 static inline void hugetlb_vma_unlock_read(struct vm_area_struct *vma)
314 {
315 }
316
317 static inline void hugetlb_vma_lock_write(struct vm_area_struct *vma)
318 {
319 }
320
321 static inline void hugetlb_vma_unlock_write(struct vm_area_struct *vma)
322 {
323 }
324
325 static inline int hugetlb_vma_trylock_write(struct vm_area_struct *vma)
326 {
327         return 1;
328 }
329
330 static inline void hugetlb_vma_assert_locked(struct vm_area_struct *vma)
331 {
332 }
333
334 static inline int pmd_huge(pmd_t pmd)
335 {
336         return 0;
337 }
338
339 static inline int pud_huge(pud_t pud)
340 {
341         return 0;
342 }
343
344 static inline int is_hugepage_only_range(struct mm_struct *mm,
345                                         unsigned long addr, unsigned long len)
346 {
347         return 0;
348 }
349
350 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
351                                 unsigned long addr, unsigned long end,
352                                 unsigned long floor, unsigned long ceiling)
353 {
354         BUG();
355 }
356
357 #ifdef CONFIG_USERFAULTFD
358 static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
359                                                 pte_t *dst_pte,
360                                                 struct vm_area_struct *dst_vma,
361                                                 unsigned long dst_addr,
362                                                 unsigned long src_addr,
363                                                 enum mcopy_atomic_mode mode,
364                                                 struct page **pagep,
365                                                 bool wp_copy)
366 {
367         BUG();
368         return 0;
369 }
370 #endif /* CONFIG_USERFAULTFD */
371
372 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
373                                         unsigned long sz)
374 {
375         return NULL;
376 }
377
378 static inline int isolate_hugetlb(struct page *page, struct list_head *list)
379 {
380         return -EBUSY;
381 }
382
383 static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb, bool unpoison)
384 {
385         return 0;
386 }
387
388 static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
389                                         bool *migratable_cleared)
390 {
391         return 0;
392 }
393
394 static inline void putback_active_hugepage(struct page *page)
395 {
396 }
397
398 static inline void move_hugetlb_state(struct folio *old_folio,
399                                         struct folio *new_folio, int reason)
400 {
401 }
402
403 static inline unsigned long hugetlb_change_protection(
404                         struct vm_area_struct *vma, unsigned long address,
405                         unsigned long end, pgprot_t newprot,
406                         unsigned long cp_flags)
407 {
408         return 0;
409 }
410
411 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
412                         struct vm_area_struct *vma, unsigned long start,
413                         unsigned long end, struct page *ref_page,
414                         zap_flags_t zap_flags)
415 {
416         BUG();
417 }
418
419 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
420                         struct vm_area_struct *vma, unsigned long address,
421                         unsigned int flags)
422 {
423         BUG();
424         return 0;
425 }
426
427 static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }
428
429 #endif /* !CONFIG_HUGETLB_PAGE */
430 /*
431  * hugepages at page global directory. If arch support
432  * hugepages at pgd level, they need to define this.
433  */
434 #ifndef pgd_huge
435 #define pgd_huge(x)     0
436 #endif
437 #ifndef p4d_huge
438 #define p4d_huge(x)     0
439 #endif
440
441 #ifndef pgd_write
442 static inline int pgd_write(pgd_t pgd)
443 {
444         BUG();
445         return 0;
446 }
447 #endif
448
449 #define HUGETLB_ANON_FILE "anon_hugepage"
450
451 enum {
452         /*
453          * The file will be used as an shm file so shmfs accounting rules
454          * apply
455          */
456         HUGETLB_SHMFS_INODE     = 1,
457         /*
458          * The file is being created on the internal vfs mount and shmfs
459          * accounting rules do not apply
460          */
461         HUGETLB_ANONHUGE_INODE  = 2,
462 };
463
464 #ifdef CONFIG_HUGETLBFS
465 struct hugetlbfs_sb_info {
466         long    max_inodes;   /* inodes allowed */
467         long    free_inodes;  /* inodes free */
468         spinlock_t      stat_lock;
469         struct hstate *hstate;
470         struct hugepage_subpool *spool;
471         kuid_t  uid;
472         kgid_t  gid;
473         umode_t mode;
474 };
475
476 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
477 {
478         return sb->s_fs_info;
479 }
480
481 struct hugetlbfs_inode_info {
482         struct shared_policy policy;
483         struct inode vfs_inode;
484         unsigned int seals;
485 };
486
487 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
488 {
489         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
490 }
491
492 extern const struct file_operations hugetlbfs_file_operations;
493 extern const struct vm_operations_struct hugetlb_vm_ops;
494 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
495                                 int creat_flags, int page_size_log);
496
497 static inline bool is_file_hugepages(struct file *file)
498 {
499         if (file->f_op == &hugetlbfs_file_operations)
500                 return true;
501
502         return is_file_shm_hugepages(file);
503 }
504
505 static inline struct hstate *hstate_inode(struct inode *i)
506 {
507         return HUGETLBFS_SB(i->i_sb)->hstate;
508 }
509 #else /* !CONFIG_HUGETLBFS */
510
511 #define is_file_hugepages(file)                 false
512 static inline struct file *
513 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
514                 int creat_flags, int page_size_log)
515 {
516         return ERR_PTR(-ENOSYS);
517 }
518
519 static inline struct hstate *hstate_inode(struct inode *i)
520 {
521         return NULL;
522 }
523 #endif /* !CONFIG_HUGETLBFS */
524
525 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
526 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
527                                         unsigned long len, unsigned long pgoff,
528                                         unsigned long flags);
529 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
530
531 unsigned long
532 generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
533                                   unsigned long len, unsigned long pgoff,
534                                   unsigned long flags);
535
536 /*
537  * huegtlb page specific state flags.  These flags are located in page.private
538  * of the hugetlb head page.  Functions created via the below macros should be
539  * used to manipulate these flags.
540  *
541  * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
542  *      allocation time.  Cleared when page is fully instantiated.  Free
543  *      routine checks flag to restore a reservation on error paths.
544  *      Synchronization:  Examined or modified by code that knows it has
545  *      the only reference to page.  i.e. After allocation but before use
546  *      or when the page is being freed.
547  * HPG_migratable  - Set after a newly allocated page is added to the page
548  *      cache and/or page tables.  Indicates the page is a candidate for
549  *      migration.
550  *      Synchronization:  Initially set after new page allocation with no
551  *      locking.  When examined and modified during migration processing
552  *      (isolate, migrate, putback) the hugetlb_lock is held.
553  * HPG_temporary - Set on a page that is temporarily allocated from the buddy
554  *      allocator.  Typically used for migration target pages when no pages
555  *      are available in the pool.  The hugetlb free page path will
556  *      immediately free pages with this flag set to the buddy allocator.
557  *      Synchronization: Can be set after huge page allocation from buddy when
558  *      code knows it has only reference.  All other examinations and
559  *      modifications require hugetlb_lock.
560  * HPG_freed - Set when page is on the free lists.
561  *      Synchronization: hugetlb_lock held for examination and modification.
562  * HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed.
563  * HPG_raw_hwp_unreliable - Set when the hugetlb page has a hwpoison sub-page
564  *     that is not tracked by raw_hwp_page list.
565  */
566 enum hugetlb_page_flags {
567         HPG_restore_reserve = 0,
568         HPG_migratable,
569         HPG_temporary,
570         HPG_freed,
571         HPG_vmemmap_optimized,
572         HPG_raw_hwp_unreliable,
573         __NR_HPAGEFLAGS,
574 };
575
576 /*
577  * Macros to create test, set and clear function definitions for
578  * hugetlb specific page flags.
579  */
580 #ifdef CONFIG_HUGETLB_PAGE
581 #define TESTHPAGEFLAG(uname, flname)                            \
582 static __always_inline                                          \
583 bool folio_test_hugetlb_##flname(struct folio *folio)           \
584         {       void *private = &folio->private;                \
585                 return test_bit(HPG_##flname, private);         \
586         }                                                       \
587 static inline int HPage##uname(struct page *page)               \
588         { return test_bit(HPG_##flname, &(page->private)); }
589
590 #define SETHPAGEFLAG(uname, flname)                             \
591 static __always_inline                                          \
592 void folio_set_hugetlb_##flname(struct folio *folio)            \
593         {       void *private = &folio->private;                \
594                 set_bit(HPG_##flname, private);                 \
595         }                                                       \
596 static inline void SetHPage##uname(struct page *page)           \
597         { set_bit(HPG_##flname, &(page->private)); }
598
599 #define CLEARHPAGEFLAG(uname, flname)                           \
600 static __always_inline                                          \
601 void folio_clear_hugetlb_##flname(struct folio *folio)          \
602         {       void *private = &folio->private;                \
603                 clear_bit(HPG_##flname, private);               \
604         }                                                       \
605 static inline void ClearHPage##uname(struct page *page)         \
606         { clear_bit(HPG_##flname, &(page->private)); }
607 #else
608 #define TESTHPAGEFLAG(uname, flname)                            \
609 static inline bool                                              \
610 folio_test_hugetlb_##flname(struct folio *folio)                \
611         { return 0; }                                           \
612 static inline int HPage##uname(struct page *page)               \
613         { return 0; }
614
615 #define SETHPAGEFLAG(uname, flname)                             \
616 static inline void                                              \
617 folio_set_hugetlb_##flname(struct folio *folio)                 \
618         { }                                                     \
619 static inline void SetHPage##uname(struct page *page)           \
620         { }
621
622 #define CLEARHPAGEFLAG(uname, flname)                           \
623 static inline void                                              \
624 folio_clear_hugetlb_##flname(struct folio *folio)               \
625         { }                                                     \
626 static inline void ClearHPage##uname(struct page *page)         \
627         { }
628 #endif
629
630 #define HPAGEFLAG(uname, flname)                                \
631         TESTHPAGEFLAG(uname, flname)                            \
632         SETHPAGEFLAG(uname, flname)                             \
633         CLEARHPAGEFLAG(uname, flname)                           \
634
635 /*
636  * Create functions associated with hugetlb page flags
637  */
638 HPAGEFLAG(RestoreReserve, restore_reserve)
639 HPAGEFLAG(Migratable, migratable)
640 HPAGEFLAG(Temporary, temporary)
641 HPAGEFLAG(Freed, freed)
642 HPAGEFLAG(VmemmapOptimized, vmemmap_optimized)
643 HPAGEFLAG(RawHwpUnreliable, raw_hwp_unreliable)
644
645 #ifdef CONFIG_HUGETLB_PAGE
646
647 #define HSTATE_NAME_LEN 32
648 /* Defines one hugetlb page size */
649 struct hstate {
650         struct mutex resize_lock;
651         int next_nid_to_alloc;
652         int next_nid_to_free;
653         unsigned int order;
654         unsigned int demote_order;
655         unsigned long mask;
656         unsigned long max_huge_pages;
657         unsigned long nr_huge_pages;
658         unsigned long free_huge_pages;
659         unsigned long resv_huge_pages;
660         unsigned long surplus_huge_pages;
661         unsigned long nr_overcommit_huge_pages;
662         struct list_head hugepage_activelist;
663         struct list_head hugepage_freelists[MAX_NUMNODES];
664         unsigned int max_huge_pages_node[MAX_NUMNODES];
665         unsigned int nr_huge_pages_node[MAX_NUMNODES];
666         unsigned int free_huge_pages_node[MAX_NUMNODES];
667         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
668 #ifdef CONFIG_CGROUP_HUGETLB
669         /* cgroup control files */
670         struct cftype cgroup_files_dfl[8];
671         struct cftype cgroup_files_legacy[10];
672 #endif
673         char name[HSTATE_NAME_LEN];
674 };
675
676 struct huge_bootmem_page {
677         struct list_head list;
678         struct hstate *hstate;
679 };
680
681 int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
682 struct page *alloc_huge_page(struct vm_area_struct *vma,
683                                 unsigned long addr, int avoid_reserve);
684 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
685                                 nodemask_t *nmask, gfp_t gfp_mask);
686 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
687                                 unsigned long address);
688 int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
689                         pgoff_t idx);
690 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
691                                 unsigned long address, struct page *page);
692
693 /* arch callback */
694 int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);
695 int __init alloc_bootmem_huge_page(struct hstate *h, int nid);
696 bool __init hugetlb_node_alloc_supported(void);
697
698 void __init hugetlb_add_hstate(unsigned order);
699 bool __init arch_hugetlb_valid_size(unsigned long size);
700 struct hstate *size_to_hstate(unsigned long size);
701
702 #ifndef HUGE_MAX_HSTATE
703 #define HUGE_MAX_HSTATE 1
704 #endif
705
706 extern struct hstate hstates[HUGE_MAX_HSTATE];
707 extern unsigned int default_hstate_idx;
708
709 #define default_hstate (hstates[default_hstate_idx])
710
711 static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio)
712 {
713         return folio->_hugetlb_subpool;
714 }
715
716 /*
717  * hugetlb page subpool pointer located in hpage[2].hugetlb_subpool
718  */
719 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
720 {
721         return hugetlb_folio_subpool(page_folio(hpage));
722 }
723
724 static inline void hugetlb_set_folio_subpool(struct folio *folio,
725                                         struct hugepage_subpool *subpool)
726 {
727         folio->_hugetlb_subpool = subpool;
728 }
729
730 static inline void hugetlb_set_page_subpool(struct page *hpage,
731                                         struct hugepage_subpool *subpool)
732 {
733         hugetlb_set_folio_subpool(page_folio(hpage), subpool);
734 }
735
736 static inline struct hstate *hstate_file(struct file *f)
737 {
738         return hstate_inode(file_inode(f));
739 }
740
741 static inline struct hstate *hstate_sizelog(int page_size_log)
742 {
743         if (!page_size_log)
744                 return &default_hstate;
745
746         if (page_size_log < BITS_PER_LONG)
747                 return size_to_hstate(1UL << page_size_log);
748
749         return NULL;
750 }
751
752 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
753 {
754         return hstate_file(vma->vm_file);
755 }
756
757 static inline unsigned long huge_page_size(const struct hstate *h)
758 {
759         return (unsigned long)PAGE_SIZE << h->order;
760 }
761
762 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
763
764 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
765
766 static inline unsigned long huge_page_mask(struct hstate *h)
767 {
768         return h->mask;
769 }
770
771 static inline unsigned int huge_page_order(struct hstate *h)
772 {
773         return h->order;
774 }
775
776 static inline unsigned huge_page_shift(struct hstate *h)
777 {
778         return h->order + PAGE_SHIFT;
779 }
780
781 static inline bool hstate_is_gigantic(struct hstate *h)
782 {
783         return huge_page_order(h) >= MAX_ORDER;
784 }
785
786 static inline unsigned int pages_per_huge_page(const struct hstate *h)
787 {
788         return 1 << h->order;
789 }
790
791 static inline unsigned int blocks_per_huge_page(struct hstate *h)
792 {
793         return huge_page_size(h) / 512;
794 }
795
796 #include <asm/hugetlb.h>
797
798 #ifndef is_hugepage_only_range
799 static inline int is_hugepage_only_range(struct mm_struct *mm,
800                                         unsigned long addr, unsigned long len)
801 {
802         return 0;
803 }
804 #define is_hugepage_only_range is_hugepage_only_range
805 #endif
806
807 #ifndef arch_clear_hugepage_flags
808 static inline void arch_clear_hugepage_flags(struct page *page) { }
809 #define arch_clear_hugepage_flags arch_clear_hugepage_flags
810 #endif
811
812 #ifndef arch_make_huge_pte
813 static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
814                                        vm_flags_t flags)
815 {
816         return pte_mkhuge(entry);
817 }
818 #endif
819
820 static inline struct hstate *folio_hstate(struct folio *folio)
821 {
822         VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
823         return size_to_hstate(folio_size(folio));
824 }
825
826 static inline struct hstate *page_hstate(struct page *page)
827 {
828         return folio_hstate(page_folio(page));
829 }
830
831 static inline unsigned hstate_index_to_shift(unsigned index)
832 {
833         return hstates[index].order + PAGE_SHIFT;
834 }
835
836 static inline int hstate_index(struct hstate *h)
837 {
838         return h - hstates;
839 }
840
841 extern int dissolve_free_huge_page(struct page *page);
842 extern int dissolve_free_huge_pages(unsigned long start_pfn,
843                                     unsigned long end_pfn);
844
845 #ifdef CONFIG_MEMORY_FAILURE
846 extern void hugetlb_clear_page_hwpoison(struct page *hpage);
847 #else
848 static inline void hugetlb_clear_page_hwpoison(struct page *hpage)
849 {
850 }
851 #endif
852
853 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
854 #ifndef arch_hugetlb_migration_supported
855 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
856 {
857         if ((huge_page_shift(h) == PMD_SHIFT) ||
858                 (huge_page_shift(h) == PUD_SHIFT) ||
859                         (huge_page_shift(h) == PGDIR_SHIFT))
860                 return true;
861         else
862                 return false;
863 }
864 #endif
865 #else
866 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
867 {
868         return false;
869 }
870 #endif
871
872 static inline bool hugepage_migration_supported(struct hstate *h)
873 {
874         return arch_hugetlb_migration_supported(h);
875 }
876
877 /*
878  * Movability check is different as compared to migration check.
879  * It determines whether or not a huge page should be placed on
880  * movable zone or not. Movability of any huge page should be
881  * required only if huge page size is supported for migration.
882  * There won't be any reason for the huge page to be movable if
883  * it is not migratable to start with. Also the size of the huge
884  * page should be large enough to be placed under a movable zone
885  * and still feasible enough to be migratable. Just the presence
886  * in movable zone does not make the migration feasible.
887  *
888  * So even though large huge page sizes like the gigantic ones
889  * are migratable they should not be movable because its not
890  * feasible to migrate them from movable zone.
891  */
892 static inline bool hugepage_movable_supported(struct hstate *h)
893 {
894         if (!hugepage_migration_supported(h))
895                 return false;
896
897         if (hstate_is_gigantic(h))
898                 return false;
899         return true;
900 }
901
902 /* Movability of hugepages depends on migration support. */
903 static inline gfp_t htlb_alloc_mask(struct hstate *h)
904 {
905         if (hugepage_movable_supported(h))
906                 return GFP_HIGHUSER_MOVABLE;
907         else
908                 return GFP_HIGHUSER;
909 }
910
911 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
912 {
913         gfp_t modified_mask = htlb_alloc_mask(h);
914
915         /* Some callers might want to enforce node */
916         modified_mask |= (gfp_mask & __GFP_THISNODE);
917
918         modified_mask |= (gfp_mask & __GFP_NOWARN);
919
920         return modified_mask;
921 }
922
923 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
924                                            struct mm_struct *mm, pte_t *pte)
925 {
926         if (huge_page_size(h) == PMD_SIZE)
927                 return pmd_lockptr(mm, (pmd_t *) pte);
928         VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
929         return &mm->page_table_lock;
930 }
931
932 #ifndef hugepages_supported
933 /*
934  * Some platform decide whether they support huge pages at boot
935  * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
936  * when there is no such support
937  */
938 #define hugepages_supported() (HPAGE_SHIFT != 0)
939 #endif
940
941 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
942
943 static inline void hugetlb_count_init(struct mm_struct *mm)
944 {
945         atomic_long_set(&mm->hugetlb_usage, 0);
946 }
947
948 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
949 {
950         atomic_long_add(l, &mm->hugetlb_usage);
951 }
952
953 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
954 {
955         atomic_long_sub(l, &mm->hugetlb_usage);
956 }
957
958 #ifndef huge_ptep_modify_prot_start
959 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
960 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
961                                                 unsigned long addr, pte_t *ptep)
962 {
963         return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
964 }
965 #endif
966
967 #ifndef huge_ptep_modify_prot_commit
968 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
969 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
970                                                 unsigned long addr, pte_t *ptep,
971                                                 pte_t old_pte, pte_t pte)
972 {
973         set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
974 }
975 #endif
976
977 #ifdef CONFIG_NUMA
978 void hugetlb_register_node(struct node *node);
979 void hugetlb_unregister_node(struct node *node);
980 #endif
981
982 #else   /* CONFIG_HUGETLB_PAGE */
983 struct hstate {};
984
985 static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio)
986 {
987         return NULL;
988 }
989
990 static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
991 {
992         return NULL;
993 }
994
995 static inline int isolate_or_dissolve_huge_page(struct page *page,
996                                                 struct list_head *list)
997 {
998         return -ENOMEM;
999 }
1000
1001 static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
1002                                            unsigned long addr,
1003                                            int avoid_reserve)
1004 {
1005         return NULL;
1006 }
1007
1008 static inline struct page *
1009 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
1010                         nodemask_t *nmask, gfp_t gfp_mask)
1011 {
1012         return NULL;
1013 }
1014
1015 static inline struct page *alloc_huge_page_vma(struct hstate *h,
1016                                                struct vm_area_struct *vma,
1017                                                unsigned long address)
1018 {
1019         return NULL;
1020 }
1021
1022 static inline int __alloc_bootmem_huge_page(struct hstate *h)
1023 {
1024         return 0;
1025 }
1026
1027 static inline struct hstate *hstate_file(struct file *f)
1028 {
1029         return NULL;
1030 }
1031
1032 static inline struct hstate *hstate_sizelog(int page_size_log)
1033 {
1034         return NULL;
1035 }
1036
1037 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
1038 {
1039         return NULL;
1040 }
1041
1042 static inline struct hstate *folio_hstate(struct folio *folio)
1043 {
1044         return NULL;
1045 }
1046
1047 static inline struct hstate *page_hstate(struct page *page)
1048 {
1049         return NULL;
1050 }
1051
1052 static inline struct hstate *size_to_hstate(unsigned long size)
1053 {
1054         return NULL;
1055 }
1056
1057 static inline unsigned long huge_page_size(struct hstate *h)
1058 {
1059         return PAGE_SIZE;
1060 }
1061
1062 static inline unsigned long huge_page_mask(struct hstate *h)
1063 {
1064         return PAGE_MASK;
1065 }
1066
1067 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
1068 {
1069         return PAGE_SIZE;
1070 }
1071
1072 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
1073 {
1074         return PAGE_SIZE;
1075 }
1076
1077 static inline unsigned int huge_page_order(struct hstate *h)
1078 {
1079         return 0;
1080 }
1081
1082 static inline unsigned int huge_page_shift(struct hstate *h)
1083 {
1084         return PAGE_SHIFT;
1085 }
1086
1087 static inline bool hstate_is_gigantic(struct hstate *h)
1088 {
1089         return false;
1090 }
1091
1092 static inline unsigned int pages_per_huge_page(struct hstate *h)
1093 {
1094         return 1;
1095 }
1096
1097 static inline unsigned hstate_index_to_shift(unsigned index)
1098 {
1099         return 0;
1100 }
1101
1102 static inline int hstate_index(struct hstate *h)
1103 {
1104         return 0;
1105 }
1106
1107 static inline int dissolve_free_huge_page(struct page *page)
1108 {
1109         return 0;
1110 }
1111
1112 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
1113                                            unsigned long end_pfn)
1114 {
1115         return 0;
1116 }
1117
1118 static inline bool hugepage_migration_supported(struct hstate *h)
1119 {
1120         return false;
1121 }
1122
1123 static inline bool hugepage_movable_supported(struct hstate *h)
1124 {
1125         return false;
1126 }
1127
1128 static inline gfp_t htlb_alloc_mask(struct hstate *h)
1129 {
1130         return 0;
1131 }
1132
1133 static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
1134 {
1135         return 0;
1136 }
1137
1138 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
1139                                            struct mm_struct *mm, pte_t *pte)
1140 {
1141         return &mm->page_table_lock;
1142 }
1143
1144 static inline void hugetlb_count_init(struct mm_struct *mm)
1145 {
1146 }
1147
1148 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
1149 {
1150 }
1151
1152 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
1153 {
1154 }
1155
1156 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
1157                                           unsigned long addr, pte_t *ptep)
1158 {
1159         return *ptep;
1160 }
1161
1162 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
1163                                    pte_t *ptep, pte_t pte)
1164 {
1165 }
1166
1167 static inline void hugetlb_register_node(struct node *node)
1168 {
1169 }
1170
1171 static inline void hugetlb_unregister_node(struct node *node)
1172 {
1173 }
1174 #endif  /* CONFIG_HUGETLB_PAGE */
1175
1176 static inline spinlock_t *huge_pte_lock(struct hstate *h,
1177                                         struct mm_struct *mm, pte_t *pte)
1178 {
1179         spinlock_t *ptl;
1180
1181         ptl = huge_pte_lockptr(h, mm, pte);
1182         spin_lock(ptl);
1183         return ptl;
1184 }
1185
1186 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
1187 extern void __init hugetlb_cma_reserve(int order);
1188 #else
1189 static inline __init void hugetlb_cma_reserve(int order)
1190 {
1191 }
1192 #endif
1193
1194 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
1195 static inline bool hugetlb_pmd_shared(pte_t *pte)
1196 {
1197         return page_count(virt_to_page(pte)) > 1;
1198 }
1199 #else
1200 static inline bool hugetlb_pmd_shared(pte_t *pte)
1201 {
1202         return false;
1203 }
1204 #endif
1205
1206 bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);
1207
1208 #ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
1209 /*
1210  * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
1211  * implement this.
1212  */
1213 #define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
1214 #endif
1215
1216 #endif /* _LINUX_HUGETLB_H */