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