Line data Source code
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/list.h>
11 : #include <linux/kref.h>
12 : #include <linux/pgtable.h>
13 : #include <linux/gfp.h>
14 :
15 : struct ctl_table;
16 : struct user_struct;
17 : struct mmu_gather;
18 :
19 : #ifndef is_hugepd
20 : typedef struct { unsigned long pd; } hugepd_t;
21 : #define is_hugepd(hugepd) (0)
22 : #define __hugepd(x) ((hugepd_t) { (x) })
23 : #endif
24 :
25 : #ifdef CONFIG_HUGETLB_PAGE
26 :
27 : #include <linux/mempolicy.h>
28 : #include <linux/shm.h>
29 : #include <asm/tlbflush.h>
30 :
31 : struct hugepage_subpool {
32 : spinlock_t lock;
33 : long count;
34 : long max_hpages; /* Maximum huge pages or -1 if no maximum. */
35 : long used_hpages; /* Used count against maximum, includes */
36 : /* both alloced and reserved pages. */
37 : struct hstate *hstate;
38 : long min_hpages; /* Minimum huge pages or -1 if no minimum. */
39 : long rsv_hpages; /* Pages reserved against global pool to */
40 : /* satisfy minimum size. */
41 : };
42 :
43 : struct resv_map {
44 : struct kref refs;
45 : spinlock_t lock;
46 : struct list_head regions;
47 : long adds_in_progress;
48 : struct list_head region_cache;
49 : long region_cache_count;
50 : #ifdef CONFIG_CGROUP_HUGETLB
51 : /*
52 : * On private mappings, the counter to uncharge reservations is stored
53 : * here. If these fields are 0, then either the mapping is shared, or
54 : * cgroup accounting is disabled for this resv_map.
55 : */
56 : struct page_counter *reservation_counter;
57 : unsigned long pages_per_hpage;
58 : struct cgroup_subsys_state *css;
59 : #endif
60 : };
61 :
62 : /*
63 : * Region tracking -- allows tracking of reservations and instantiated pages
64 : * across the pages in a mapping.
65 : *
66 : * The region data structures are embedded into a resv_map and protected
67 : * by a resv_map's lock. The set of regions within the resv_map represent
68 : * reservations for huge pages, or huge pages that have already been
69 : * instantiated within the map. The from and to elements are huge page
70 : * indicies into the associated mapping. from indicates the starting index
71 : * of the region. to represents the first index past the end of the region.
72 : *
73 : * For example, a file region structure with from == 0 and to == 4 represents
74 : * four huge pages in a mapping. It is important to note that the to element
75 : * represents the first element past the end of the region. This is used in
76 : * arithmetic as 4(to) - 0(from) = 4 huge pages in the region.
77 : *
78 : * Interval notation of the form [from, to) will be used to indicate that
79 : * the endpoint from is inclusive and to is exclusive.
80 : */
81 : struct file_region {
82 : struct list_head link;
83 : long from;
84 : long to;
85 : #ifdef CONFIG_CGROUP_HUGETLB
86 : /*
87 : * On shared mappings, each reserved region appears as a struct
88 : * file_region in resv_map. These fields hold the info needed to
89 : * uncharge each reservation.
90 : */
91 : struct page_counter *reservation_counter;
92 : struct cgroup_subsys_state *css;
93 : #endif
94 : };
95 :
96 : extern struct resv_map *resv_map_alloc(void);
97 : void resv_map_release(struct kref *ref);
98 :
99 : extern spinlock_t hugetlb_lock;
100 : extern int hugetlb_max_hstate __read_mostly;
101 : #define for_each_hstate(h) \
102 : for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
103 :
104 : struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
105 : long min_hpages);
106 : void hugepage_put_subpool(struct hugepage_subpool *spool);
107 :
108 : void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
109 : int hugetlb_sysctl_handler(struct ctl_table *, int, void *, size_t *, loff_t *);
110 : int hugetlb_overcommit_handler(struct ctl_table *, int, void *, size_t *,
111 : loff_t *);
112 : int hugetlb_treat_movable_handler(struct ctl_table *, int, void *, size_t *,
113 : loff_t *);
114 : int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, void *, size_t *,
115 : loff_t *);
116 :
117 : int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
118 : long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
119 : struct page **, struct vm_area_struct **,
120 : unsigned long *, unsigned long *, long, unsigned int,
121 : int *);
122 : void unmap_hugepage_range(struct vm_area_struct *,
123 : unsigned long, unsigned long, struct page *);
124 : void __unmap_hugepage_range_final(struct mmu_gather *tlb,
125 : struct vm_area_struct *vma,
126 : unsigned long start, unsigned long end,
127 : struct page *ref_page);
128 : void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
129 : unsigned long start, unsigned long end,
130 : struct page *ref_page);
131 : void hugetlb_report_meminfo(struct seq_file *);
132 : int hugetlb_report_node_meminfo(char *buf, int len, int nid);
133 : void hugetlb_show_meminfo(void);
134 : unsigned long hugetlb_total_pages(void);
135 : vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
136 : unsigned long address, unsigned int flags);
137 : int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
138 : struct vm_area_struct *dst_vma,
139 : unsigned long dst_addr,
140 : unsigned long src_addr,
141 : struct page **pagep);
142 : bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
143 : struct vm_area_struct *vma,
144 : vm_flags_t vm_flags);
145 : long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
146 : long freed);
147 : bool isolate_huge_page(struct page *page, struct list_head *list);
148 : void putback_active_hugepage(struct page *page);
149 : void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
150 : void free_huge_page(struct page *page);
151 : void hugetlb_fix_reserve_counts(struct inode *inode);
152 : extern struct mutex *hugetlb_fault_mutex_table;
153 : u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
154 :
155 : pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
156 :
157 : struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
158 :
159 : extern int sysctl_hugetlb_shm_group;
160 : extern struct list_head huge_boot_pages;
161 :
162 : /* arch callbacks */
163 :
164 : pte_t *huge_pte_alloc(struct mm_struct *mm,
165 : unsigned long addr, unsigned long sz);
166 : pte_t *huge_pte_offset(struct mm_struct *mm,
167 : unsigned long addr, unsigned long sz);
168 : int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
169 : unsigned long *addr, pte_t *ptep);
170 : void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
171 : unsigned long *start, unsigned long *end);
172 : struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
173 : int write);
174 : struct page *follow_huge_pd(struct vm_area_struct *vma,
175 : unsigned long address, hugepd_t hpd,
176 : int flags, int pdshift);
177 : struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
178 : pmd_t *pmd, int flags);
179 : struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
180 : pud_t *pud, int flags);
181 : struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
182 : pgd_t *pgd, int flags);
183 :
184 : int pmd_huge(pmd_t pmd);
185 : int pud_huge(pud_t pud);
186 : unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
187 : unsigned long address, unsigned long end, pgprot_t newprot);
188 :
189 : bool is_hugetlb_entry_migration(pte_t pte);
190 :
191 : #else /* !CONFIG_HUGETLB_PAGE */
192 :
193 : static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
194 : {
195 : }
196 :
197 1 : static inline unsigned long hugetlb_total_pages(void)
198 : {
199 1 : return 0;
200 : }
201 :
202 : static inline struct address_space *hugetlb_page_mapping_lock_write(
203 : struct page *hpage)
204 : {
205 : return NULL;
206 : }
207 :
208 : static inline int huge_pmd_unshare(struct mm_struct *mm,
209 : struct vm_area_struct *vma,
210 : unsigned long *addr, pte_t *ptep)
211 : {
212 : return 0;
213 : }
214 :
215 : static inline void adjust_range_if_pmd_sharing_possible(
216 : struct vm_area_struct *vma,
217 : unsigned long *start, unsigned long *end)
218 : {
219 : }
220 :
221 : static inline long follow_hugetlb_page(struct mm_struct *mm,
222 : struct vm_area_struct *vma, struct page **pages,
223 : struct vm_area_struct **vmas, unsigned long *position,
224 : unsigned long *nr_pages, long i, unsigned int flags,
225 : int *nonblocking)
226 : {
227 : BUG();
228 : return 0;
229 : }
230 :
231 10306 : static inline struct page *follow_huge_addr(struct mm_struct *mm,
232 : unsigned long address, int write)
233 : {
234 10306 : return ERR_PTR(-EINVAL);
235 : }
236 :
237 : static inline int copy_hugetlb_page_range(struct mm_struct *dst,
238 : struct mm_struct *src, struct vm_area_struct *vma)
239 : {
240 : BUG();
241 : return 0;
242 : }
243 :
244 1 : static inline void hugetlb_report_meminfo(struct seq_file *m)
245 : {
246 1 : }
247 :
248 0 : static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
249 : {
250 0 : return 0;
251 : }
252 :
253 0 : static inline void hugetlb_show_meminfo(void)
254 : {
255 0 : }
256 :
257 : static inline struct page *follow_huge_pd(struct vm_area_struct *vma,
258 : unsigned long address, hugepd_t hpd, int flags,
259 : int pdshift)
260 : {
261 : return NULL;
262 : }
263 :
264 : static inline struct page *follow_huge_pmd(struct mm_struct *mm,
265 : unsigned long address, pmd_t *pmd, int flags)
266 : {
267 : return NULL;
268 : }
269 :
270 : static inline struct page *follow_huge_pud(struct mm_struct *mm,
271 : unsigned long address, pud_t *pud, int flags)
272 : {
273 : return NULL;
274 : }
275 :
276 : static inline struct page *follow_huge_pgd(struct mm_struct *mm,
277 : unsigned long address, pgd_t *pgd, int flags)
278 : {
279 : return NULL;
280 : }
281 :
282 : static inline int prepare_hugepage_range(struct file *file,
283 : unsigned long addr, unsigned long len)
284 : {
285 : return -EINVAL;
286 : }
287 :
288 9986 : static inline int pmd_huge(pmd_t pmd)
289 : {
290 9986 : return 0;
291 : }
292 :
293 17818 : static inline int pud_huge(pud_t pud)
294 : {
295 17818 : return 0;
296 : }
297 :
298 954 : static inline int is_hugepage_only_range(struct mm_struct *mm,
299 : unsigned long addr, unsigned long len)
300 : {
301 954 : return 0;
302 : }
303 :
304 : static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
305 : unsigned long addr, unsigned long end,
306 : unsigned long floor, unsigned long ceiling)
307 : {
308 : BUG();
309 : }
310 :
311 : static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
312 : pte_t *dst_pte,
313 : struct vm_area_struct *dst_vma,
314 : unsigned long dst_addr,
315 : unsigned long src_addr,
316 : struct page **pagep)
317 : {
318 : BUG();
319 : return 0;
320 : }
321 :
322 : static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
323 : unsigned long sz)
324 : {
325 : return NULL;
326 : }
327 :
328 : static inline bool isolate_huge_page(struct page *page, struct list_head *list)
329 : {
330 : return false;
331 : }
332 :
333 : static inline void putback_active_hugepage(struct page *page)
334 : {
335 : }
336 :
337 : static inline void move_hugetlb_state(struct page *oldpage,
338 : struct page *newpage, int reason)
339 : {
340 : }
341 :
342 : static inline unsigned long hugetlb_change_protection(
343 : struct vm_area_struct *vma, unsigned long address,
344 : unsigned long end, pgprot_t newprot)
345 : {
346 : return 0;
347 : }
348 :
349 : static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
350 : struct vm_area_struct *vma, unsigned long start,
351 : unsigned long end, struct page *ref_page)
352 : {
353 : BUG();
354 : }
355 :
356 : static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
357 : struct vm_area_struct *vma, unsigned long start,
358 : unsigned long end, struct page *ref_page)
359 : {
360 : BUG();
361 : }
362 :
363 : static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
364 : struct vm_area_struct *vma, unsigned long address,
365 : unsigned int flags)
366 : {
367 : BUG();
368 : return 0;
369 : }
370 :
371 : #endif /* !CONFIG_HUGETLB_PAGE */
372 : /*
373 : * hugepages at page global directory. If arch support
374 : * hugepages at pgd level, they need to define this.
375 : */
376 : #ifndef pgd_huge
377 : #define pgd_huge(x) 0
378 : #endif
379 : #ifndef p4d_huge
380 : #define p4d_huge(x) 0
381 : #endif
382 :
383 : #ifndef pgd_write
384 : static inline int pgd_write(pgd_t pgd)
385 : {
386 : BUG();
387 : return 0;
388 : }
389 : #endif
390 :
391 : #define HUGETLB_ANON_FILE "anon_hugepage"
392 :
393 : enum {
394 : /*
395 : * The file will be used as an shm file so shmfs accounting rules
396 : * apply
397 : */
398 : HUGETLB_SHMFS_INODE = 1,
399 : /*
400 : * The file is being created on the internal vfs mount and shmfs
401 : * accounting rules do not apply
402 : */
403 : HUGETLB_ANONHUGE_INODE = 2,
404 : };
405 :
406 : #ifdef CONFIG_HUGETLBFS
407 : struct hugetlbfs_sb_info {
408 : long max_inodes; /* inodes allowed */
409 : long free_inodes; /* inodes free */
410 : spinlock_t stat_lock;
411 : struct hstate *hstate;
412 : struct hugepage_subpool *spool;
413 : kuid_t uid;
414 : kgid_t gid;
415 : umode_t mode;
416 : };
417 :
418 : static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
419 : {
420 : return sb->s_fs_info;
421 : }
422 :
423 : struct hugetlbfs_inode_info {
424 : struct shared_policy policy;
425 : struct inode vfs_inode;
426 : unsigned int seals;
427 : };
428 :
429 : static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
430 : {
431 : return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
432 : }
433 :
434 : extern const struct file_operations hugetlbfs_file_operations;
435 : extern const struct vm_operations_struct hugetlb_vm_ops;
436 : struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
437 : struct user_struct **user, int creat_flags,
438 : int page_size_log);
439 :
440 : static inline bool is_file_hugepages(struct file *file)
441 : {
442 : if (file->f_op == &hugetlbfs_file_operations)
443 : return true;
444 :
445 : return is_file_shm_hugepages(file);
446 : }
447 :
448 : static inline struct hstate *hstate_inode(struct inode *i)
449 : {
450 : return HUGETLBFS_SB(i->i_sb)->hstate;
451 : }
452 : #else /* !CONFIG_HUGETLBFS */
453 :
454 : #define is_file_hugepages(file) false
455 : static inline struct file *
456 : hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
457 : struct user_struct **user, int creat_flags,
458 : int page_size_log)
459 : {
460 3 : return ERR_PTR(-ENOSYS);
461 : }
462 :
463 : static inline struct hstate *hstate_inode(struct inode *i)
464 : {
465 : return NULL;
466 : }
467 : #endif /* !CONFIG_HUGETLBFS */
468 :
469 : #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
470 : unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
471 : unsigned long len, unsigned long pgoff,
472 : unsigned long flags);
473 : #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
474 :
475 : /*
476 : * huegtlb page specific state flags. These flags are located in page.private
477 : * of the hugetlb head page. Functions created via the below macros should be
478 : * used to manipulate these flags.
479 : *
480 : * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
481 : * allocation time. Cleared when page is fully instantiated. Free
482 : * routine checks flag to restore a reservation on error paths.
483 : * Synchronization: Examined or modified by code that knows it has
484 : * the only reference to page. i.e. After allocation but before use
485 : * or when the page is being freed.
486 : * HPG_migratable - Set after a newly allocated page is added to the page
487 : * cache and/or page tables. Indicates the page is a candidate for
488 : * migration.
489 : * Synchronization: Initially set after new page allocation with no
490 : * locking. When examined and modified during migration processing
491 : * (isolate, migrate, putback) the hugetlb_lock is held.
492 : * HPG_temporary - - Set on a page that is temporarily allocated from the buddy
493 : * allocator. Typically used for migration target pages when no pages
494 : * are available in the pool. The hugetlb free page path will
495 : * immediately free pages with this flag set to the buddy allocator.
496 : * Synchronization: Can be set after huge page allocation from buddy when
497 : * code knows it has only reference. All other examinations and
498 : * modifications require hugetlb_lock.
499 : * HPG_freed - Set when page is on the free lists.
500 : * Synchronization: hugetlb_lock held for examination and modification.
501 : */
502 : enum hugetlb_page_flags {
503 : HPG_restore_reserve = 0,
504 : HPG_migratable,
505 : HPG_temporary,
506 : HPG_freed,
507 : __NR_HPAGEFLAGS,
508 : };
509 :
510 : /*
511 : * Macros to create test, set and clear function definitions for
512 : * hugetlb specific page flags.
513 : */
514 : #ifdef CONFIG_HUGETLB_PAGE
515 : #define TESTHPAGEFLAG(uname, flname) \
516 : static inline int HPage##uname(struct page *page) \
517 : { return test_bit(HPG_##flname, &(page->private)); }
518 :
519 : #define SETHPAGEFLAG(uname, flname) \
520 : static inline void SetHPage##uname(struct page *page) \
521 : { set_bit(HPG_##flname, &(page->private)); }
522 :
523 : #define CLEARHPAGEFLAG(uname, flname) \
524 : static inline void ClearHPage##uname(struct page *page) \
525 : { clear_bit(HPG_##flname, &(page->private)); }
526 : #else
527 : #define TESTHPAGEFLAG(uname, flname) \
528 : static inline int HPage##uname(struct page *page) \
529 : { return 0; }
530 :
531 : #define SETHPAGEFLAG(uname, flname) \
532 : static inline void SetHPage##uname(struct page *page) \
533 : { }
534 :
535 : #define CLEARHPAGEFLAG(uname, flname) \
536 : static inline void ClearHPage##uname(struct page *page) \
537 : { }
538 : #endif
539 :
540 : #define HPAGEFLAG(uname, flname) \
541 : TESTHPAGEFLAG(uname, flname) \
542 : SETHPAGEFLAG(uname, flname) \
543 : CLEARHPAGEFLAG(uname, flname) \
544 :
545 : /*
546 : * Create functions associated with hugetlb page flags
547 : */
548 : HPAGEFLAG(RestoreReserve, restore_reserve)
549 : HPAGEFLAG(Migratable, migratable)
550 : HPAGEFLAG(Temporary, temporary)
551 : HPAGEFLAG(Freed, freed)
552 :
553 : #ifdef CONFIG_HUGETLB_PAGE
554 :
555 : #define HSTATE_NAME_LEN 32
556 : /* Defines one hugetlb page size */
557 : struct hstate {
558 : int next_nid_to_alloc;
559 : int next_nid_to_free;
560 : unsigned int order;
561 : unsigned long mask;
562 : unsigned long max_huge_pages;
563 : unsigned long nr_huge_pages;
564 : unsigned long free_huge_pages;
565 : unsigned long resv_huge_pages;
566 : unsigned long surplus_huge_pages;
567 : unsigned long nr_overcommit_huge_pages;
568 : struct list_head hugepage_activelist;
569 : struct list_head hugepage_freelists[MAX_NUMNODES];
570 : unsigned int nr_huge_pages_node[MAX_NUMNODES];
571 : unsigned int free_huge_pages_node[MAX_NUMNODES];
572 : unsigned int surplus_huge_pages_node[MAX_NUMNODES];
573 : #ifdef CONFIG_CGROUP_HUGETLB
574 : /* cgroup control files */
575 : struct cftype cgroup_files_dfl[7];
576 : struct cftype cgroup_files_legacy[9];
577 : #endif
578 : char name[HSTATE_NAME_LEN];
579 : };
580 :
581 : struct huge_bootmem_page {
582 : struct list_head list;
583 : struct hstate *hstate;
584 : };
585 :
586 : struct page *alloc_huge_page(struct vm_area_struct *vma,
587 : unsigned long addr, int avoid_reserve);
588 : struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
589 : nodemask_t *nmask, gfp_t gfp_mask);
590 : struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
591 : unsigned long address);
592 : int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
593 : pgoff_t idx);
594 :
595 : /* arch callback */
596 : int __init __alloc_bootmem_huge_page(struct hstate *h);
597 : int __init alloc_bootmem_huge_page(struct hstate *h);
598 :
599 : void __init hugetlb_add_hstate(unsigned order);
600 : bool __init arch_hugetlb_valid_size(unsigned long size);
601 : struct hstate *size_to_hstate(unsigned long size);
602 :
603 : #ifndef HUGE_MAX_HSTATE
604 : #define HUGE_MAX_HSTATE 1
605 : #endif
606 :
607 : extern struct hstate hstates[HUGE_MAX_HSTATE];
608 : extern unsigned int default_hstate_idx;
609 :
610 : #define default_hstate (hstates[default_hstate_idx])
611 :
612 : /*
613 : * hugetlb page subpool pointer located in hpage[1].private
614 : */
615 : static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
616 : {
617 : return (struct hugepage_subpool *)(hpage+1)->private;
618 : }
619 :
620 : static inline void hugetlb_set_page_subpool(struct page *hpage,
621 : struct hugepage_subpool *subpool)
622 : {
623 : set_page_private(hpage+1, (unsigned long)subpool);
624 : }
625 :
626 : static inline struct hstate *hstate_file(struct file *f)
627 : {
628 : return hstate_inode(file_inode(f));
629 : }
630 :
631 : static inline struct hstate *hstate_sizelog(int page_size_log)
632 : {
633 : if (!page_size_log)
634 : return &default_hstate;
635 :
636 : return size_to_hstate(1UL << page_size_log);
637 : }
638 :
639 : static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
640 : {
641 : return hstate_file(vma->vm_file);
642 : }
643 :
644 : static inline unsigned long huge_page_size(struct hstate *h)
645 : {
646 : return (unsigned long)PAGE_SIZE << h->order;
647 : }
648 :
649 : extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
650 :
651 : extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
652 :
653 : static inline unsigned long huge_page_mask(struct hstate *h)
654 : {
655 : return h->mask;
656 : }
657 :
658 : static inline unsigned int huge_page_order(struct hstate *h)
659 : {
660 : return h->order;
661 : }
662 :
663 : static inline unsigned huge_page_shift(struct hstate *h)
664 : {
665 : return h->order + PAGE_SHIFT;
666 : }
667 :
668 : static inline bool hstate_is_gigantic(struct hstate *h)
669 : {
670 : return huge_page_order(h) >= MAX_ORDER;
671 : }
672 :
673 : static inline unsigned int pages_per_huge_page(struct hstate *h)
674 : {
675 : return 1 << h->order;
676 : }
677 :
678 : static inline unsigned int blocks_per_huge_page(struct hstate *h)
679 : {
680 : return huge_page_size(h) / 512;
681 : }
682 :
683 : #include <asm/hugetlb.h>
684 :
685 : #ifndef is_hugepage_only_range
686 : static inline int is_hugepage_only_range(struct mm_struct *mm,
687 : unsigned long addr, unsigned long len)
688 : {
689 : return 0;
690 : }
691 : #define is_hugepage_only_range is_hugepage_only_range
692 : #endif
693 :
694 : #ifndef arch_clear_hugepage_flags
695 : static inline void arch_clear_hugepage_flags(struct page *page) { }
696 : #define arch_clear_hugepage_flags arch_clear_hugepage_flags
697 : #endif
698 :
699 : #ifndef arch_make_huge_pte
700 : static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
701 : struct page *page, int writable)
702 : {
703 : return entry;
704 : }
705 : #endif
706 :
707 : static inline struct hstate *page_hstate(struct page *page)
708 : {
709 : VM_BUG_ON_PAGE(!PageHuge(page), page);
710 : return size_to_hstate(page_size(page));
711 : }
712 :
713 : static inline unsigned hstate_index_to_shift(unsigned index)
714 : {
715 : return hstates[index].order + PAGE_SHIFT;
716 : }
717 :
718 : static inline int hstate_index(struct hstate *h)
719 : {
720 : return h - hstates;
721 : }
722 :
723 : pgoff_t __basepage_index(struct page *page);
724 :
725 : /* Return page->index in PAGE_SIZE units */
726 : static inline pgoff_t basepage_index(struct page *page)
727 : {
728 : if (!PageCompound(page))
729 : return page->index;
730 :
731 : return __basepage_index(page);
732 : }
733 :
734 : extern int dissolve_free_huge_page(struct page *page);
735 : extern int dissolve_free_huge_pages(unsigned long start_pfn,
736 : unsigned long end_pfn);
737 :
738 : #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
739 : #ifndef arch_hugetlb_migration_supported
740 : static inline bool arch_hugetlb_migration_supported(struct hstate *h)
741 : {
742 : if ((huge_page_shift(h) == PMD_SHIFT) ||
743 : (huge_page_shift(h) == PUD_SHIFT) ||
744 : (huge_page_shift(h) == PGDIR_SHIFT))
745 : return true;
746 : else
747 : return false;
748 : }
749 : #endif
750 : #else
751 : static inline bool arch_hugetlb_migration_supported(struct hstate *h)
752 : {
753 : return false;
754 : }
755 : #endif
756 :
757 : static inline bool hugepage_migration_supported(struct hstate *h)
758 : {
759 : return arch_hugetlb_migration_supported(h);
760 : }
761 :
762 : /*
763 : * Movability check is different as compared to migration check.
764 : * It determines whether or not a huge page should be placed on
765 : * movable zone or not. Movability of any huge page should be
766 : * required only if huge page size is supported for migration.
767 : * There wont be any reason for the huge page to be movable if
768 : * it is not migratable to start with. Also the size of the huge
769 : * page should be large enough to be placed under a movable zone
770 : * and still feasible enough to be migratable. Just the presence
771 : * in movable zone does not make the migration feasible.
772 : *
773 : * So even though large huge page sizes like the gigantic ones
774 : * are migratable they should not be movable because its not
775 : * feasible to migrate them from movable zone.
776 : */
777 : static inline bool hugepage_movable_supported(struct hstate *h)
778 : {
779 : if (!hugepage_migration_supported(h))
780 : return false;
781 :
782 : if (hstate_is_gigantic(h))
783 : return false;
784 : return true;
785 : }
786 :
787 : /* Movability of hugepages depends on migration support. */
788 : static inline gfp_t htlb_alloc_mask(struct hstate *h)
789 : {
790 : if (hugepage_movable_supported(h))
791 : return GFP_HIGHUSER_MOVABLE;
792 : else
793 : return GFP_HIGHUSER;
794 : }
795 :
796 : static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
797 : {
798 : gfp_t modified_mask = htlb_alloc_mask(h);
799 :
800 : /* Some callers might want to enforce node */
801 : modified_mask |= (gfp_mask & __GFP_THISNODE);
802 :
803 : modified_mask |= (gfp_mask & __GFP_NOWARN);
804 :
805 : return modified_mask;
806 : }
807 :
808 : static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
809 : struct mm_struct *mm, pte_t *pte)
810 : {
811 : if (huge_page_size(h) == PMD_SIZE)
812 : return pmd_lockptr(mm, (pmd_t *) pte);
813 : VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
814 : return &mm->page_table_lock;
815 : }
816 :
817 : #ifndef hugepages_supported
818 : /*
819 : * Some platform decide whether they support huge pages at boot
820 : * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
821 : * when there is no such support
822 : */
823 : #define hugepages_supported() (HPAGE_SHIFT != 0)
824 : #endif
825 :
826 : void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
827 :
828 : static inline void hugetlb_count_add(long l, struct mm_struct *mm)
829 : {
830 : atomic_long_add(l, &mm->hugetlb_usage);
831 : }
832 :
833 : static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
834 : {
835 : atomic_long_sub(l, &mm->hugetlb_usage);
836 : }
837 :
838 : #ifndef set_huge_swap_pte_at
839 : static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
840 : pte_t *ptep, pte_t pte, unsigned long sz)
841 : {
842 : set_huge_pte_at(mm, addr, ptep, pte);
843 : }
844 : #endif
845 :
846 : #ifndef huge_ptep_modify_prot_start
847 : #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
848 : static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
849 : unsigned long addr, pte_t *ptep)
850 : {
851 : return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
852 : }
853 : #endif
854 :
855 : #ifndef huge_ptep_modify_prot_commit
856 : #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
857 : static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
858 : unsigned long addr, pte_t *ptep,
859 : pte_t old_pte, pte_t pte)
860 : {
861 : set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
862 : }
863 : #endif
864 :
865 : #else /* CONFIG_HUGETLB_PAGE */
866 : struct hstate {};
867 :
868 : static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
869 : unsigned long addr,
870 : int avoid_reserve)
871 : {
872 : return NULL;
873 : }
874 :
875 : static inline struct page *
876 : alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
877 : nodemask_t *nmask, gfp_t gfp_mask)
878 : {
879 : return NULL;
880 : }
881 :
882 : static inline struct page *alloc_huge_page_vma(struct hstate *h,
883 : struct vm_area_struct *vma,
884 : unsigned long address)
885 : {
886 : return NULL;
887 : }
888 :
889 : static inline int __alloc_bootmem_huge_page(struct hstate *h)
890 : {
891 : return 0;
892 : }
893 :
894 : static inline struct hstate *hstate_file(struct file *f)
895 : {
896 : return NULL;
897 : }
898 :
899 0 : static inline struct hstate *hstate_sizelog(int page_size_log)
900 : {
901 0 : return NULL;
902 : }
903 :
904 0 : static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
905 : {
906 0 : return NULL;
907 : }
908 :
909 : static inline struct hstate *page_hstate(struct page *page)
910 : {
911 : return NULL;
912 : }
913 :
914 : static inline unsigned long huge_page_size(struct hstate *h)
915 : {
916 : return PAGE_SIZE;
917 : }
918 :
919 : static inline unsigned long huge_page_mask(struct hstate *h)
920 : {
921 : return PAGE_MASK;
922 : }
923 :
924 0 : static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
925 : {
926 0 : return PAGE_SIZE;
927 : }
928 :
929 : static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
930 : {
931 : return PAGE_SIZE;
932 : }
933 :
934 : static inline unsigned int huge_page_order(struct hstate *h)
935 : {
936 : return 0;
937 : }
938 :
939 : static inline unsigned int huge_page_shift(struct hstate *h)
940 : {
941 : return PAGE_SHIFT;
942 : }
943 :
944 : static inline bool hstate_is_gigantic(struct hstate *h)
945 : {
946 : return false;
947 : }
948 :
949 : static inline unsigned int pages_per_huge_page(struct hstate *h)
950 : {
951 : return 1;
952 : }
953 :
954 : static inline unsigned hstate_index_to_shift(unsigned index)
955 : {
956 : return 0;
957 : }
958 :
959 : static inline int hstate_index(struct hstate *h)
960 : {
961 : return 0;
962 : }
963 :
964 0 : static inline pgoff_t basepage_index(struct page *page)
965 : {
966 0 : return page->index;
967 : }
968 :
969 : static inline int dissolve_free_huge_page(struct page *page)
970 : {
971 : return 0;
972 : }
973 :
974 : static inline int dissolve_free_huge_pages(unsigned long start_pfn,
975 : unsigned long end_pfn)
976 : {
977 : return 0;
978 : }
979 :
980 : static inline bool hugepage_migration_supported(struct hstate *h)
981 : {
982 : return false;
983 : }
984 :
985 : static inline bool hugepage_movable_supported(struct hstate *h)
986 : {
987 : return false;
988 : }
989 :
990 : static inline gfp_t htlb_alloc_mask(struct hstate *h)
991 : {
992 : return 0;
993 : }
994 :
995 : static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
996 : {
997 : return 0;
998 : }
999 :
1000 0 : static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
1001 : struct mm_struct *mm, pte_t *pte)
1002 : {
1003 0 : return &mm->page_table_lock;
1004 : }
1005 :
1006 55 : static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
1007 : {
1008 55 : }
1009 :
1010 : static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
1011 : {
1012 : }
1013 :
1014 : static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
1015 : pte_t *ptep, pte_t pte, unsigned long sz)
1016 : {
1017 : }
1018 : #endif /* CONFIG_HUGETLB_PAGE */
1019 :
1020 : static inline spinlock_t *huge_pte_lock(struct hstate *h,
1021 : struct mm_struct *mm, pte_t *pte)
1022 : {
1023 : spinlock_t *ptl;
1024 :
1025 : ptl = huge_pte_lockptr(h, mm, pte);
1026 : spin_lock(ptl);
1027 : return ptl;
1028 : }
1029 :
1030 : #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
1031 : extern void __init hugetlb_cma_reserve(int order);
1032 : extern void __init hugetlb_cma_check(void);
1033 : #else
1034 : static inline __init void hugetlb_cma_reserve(int order)
1035 : {
1036 : }
1037 : static inline __init void hugetlb_cma_check(void)
1038 : {
1039 : }
1040 : #endif
1041 :
1042 : #endif /* _LINUX_HUGETLB_H */
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