linux/include/linux/hugetlb.h
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   1#ifndef _LINUX_HUGETLB_H
   2#define _LINUX_HUGETLB_H
   3
   4#include <linux/mm_types.h>
   5#include <linux/fs.h>
   6#include <linux/hugetlb_inline.h>
   7#include <linux/cgroup.h>
   8
   9struct ctl_table;
  10struct user_struct;
  11struct mmu_gather;
  12
  13#ifdef CONFIG_HUGETLB_PAGE
  14
  15#include <linux/mempolicy.h>
  16#include <linux/shm.h>
  17#include <asm/tlbflush.h>
  18
  19struct hugepage_subpool {
  20        spinlock_t lock;
  21        long count;
  22        long max_hpages, used_hpages;
  23};
  24
  25extern spinlock_t hugetlb_lock;
  26extern int hugetlb_max_hstate __read_mostly;
  27#define for_each_hstate(h) \
  28        for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
  29
  30struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
  31void hugepage_put_subpool(struct hugepage_subpool *spool);
  32
  33int PageHuge(struct page *page);
  34
  35void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  36int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  37int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  38int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  39
  40#ifdef CONFIG_NUMA
  41int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  42                                        void __user *, size_t *, loff_t *);
  43#endif
  44
  45int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  46long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  47                         struct page **, struct vm_area_struct **,
  48                         unsigned long *, unsigned long *, long, unsigned int);
  49void unmap_hugepage_range(struct vm_area_struct *,
  50                          unsigned long, unsigned long, struct page *);
  51void __unmap_hugepage_range_final(struct mmu_gather *tlb,
  52                          struct vm_area_struct *vma,
  53                          unsigned long start, unsigned long end,
  54                          struct page *ref_page);
  55void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
  56                                unsigned long start, unsigned long end,
  57                                struct page *ref_page);
  58int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  59void hugetlb_report_meminfo(struct seq_file *);
  60int hugetlb_report_node_meminfo(int, char *);
  61unsigned long hugetlb_total_pages(void);
  62int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  63                        unsigned long address, unsigned int flags);
  64int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  65                                                struct vm_area_struct *vma,
  66                                                vm_flags_t vm_flags);
  67void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  68int dequeue_hwpoisoned_huge_page(struct page *page);
  69void copy_huge_page(struct page *dst, struct page *src);
  70
  71extern unsigned long hugepages_treat_as_movable;
  72extern const unsigned long hugetlb_zero, hugetlb_infinity;
  73extern int sysctl_hugetlb_shm_group;
  74extern struct list_head huge_boot_pages;
  75
  76/* arch callbacks */
  77
  78pte_t *huge_pte_alloc(struct mm_struct *mm,
  79                        unsigned long addr, unsigned long sz);
  80pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  81int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  82struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  83                              int write);
  84struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  85                                pmd_t *pmd, int write);
  86struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  87                                pud_t *pud, int write);
  88int pmd_huge(pmd_t pmd);
  89int pud_huge(pud_t pmd);
  90unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
  91                unsigned long address, unsigned long end, pgprot_t newprot);
  92
  93#else /* !CONFIG_HUGETLB_PAGE */
  94
  95static inline int PageHuge(struct page *page)
  96{
  97        return 0;
  98}
  99
 100static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 101{
 102}
 103
 104static inline unsigned long hugetlb_total_pages(void)
 105{
 106        return 0;
 107}
 108
 109#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
 110#define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 111#define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 112#define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
 113static inline void hugetlb_report_meminfo(struct seq_file *m)
 114{
 115}
 116#define hugetlb_report_node_meminfo(n, buf)     0
 117#define follow_huge_pmd(mm, addr, pmd, write)   NULL
 118#define follow_huge_pud(mm, addr, pud, write)   NULL
 119#define prepare_hugepage_range(file, addr, len) (-EINVAL)
 120#define pmd_huge(x)     0
 121#define pud_huge(x)     0
 122#define is_hugepage_only_range(mm, addr, len)   0
 123#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 124#define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 125#define huge_pte_offset(mm, address)    0
 126static inline int dequeue_hwpoisoned_huge_page(struct page *page)
 127{
 128        return 0;
 129}
 130
 131static inline void copy_huge_page(struct page *dst, struct page *src)
 132{
 133}
 134
 135static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 136                unsigned long address, unsigned long end, pgprot_t newprot)
 137{
 138        return 0;
 139}
 140
 141static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 142                        struct vm_area_struct *vma, unsigned long start,
 143                        unsigned long end, struct page *ref_page)
 144{
 145        BUG();
 146}
 147
 148static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 149                        struct vm_area_struct *vma, unsigned long start,
 150                        unsigned long end, struct page *ref_page)
 151{
 152        BUG();
 153}
 154
 155#endif /* !CONFIG_HUGETLB_PAGE */
 156
 157#define HUGETLB_ANON_FILE "anon_hugepage"
 158
 159enum {
 160        /*
 161         * The file will be used as an shm file so shmfs accounting rules
 162         * apply
 163         */
 164        HUGETLB_SHMFS_INODE     = 1,
 165        /*
 166         * The file is being created on the internal vfs mount and shmfs
 167         * accounting rules do not apply
 168         */
 169        HUGETLB_ANONHUGE_INODE  = 2,
 170};
 171
 172#ifdef CONFIG_HUGETLBFS
 173struct hugetlbfs_sb_info {
 174        long    max_inodes;   /* inodes allowed */
 175        long    free_inodes;  /* inodes free */
 176        spinlock_t      stat_lock;
 177        struct hstate *hstate;
 178        struct hugepage_subpool *spool;
 179};
 180
 181static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 182{
 183        return sb->s_fs_info;
 184}
 185
 186extern const struct file_operations hugetlbfs_file_operations;
 187extern const struct vm_operations_struct hugetlb_vm_ops;
 188struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 189                                struct user_struct **user, int creat_flags,
 190                                int page_size_log);
 191
 192static inline int is_file_hugepages(struct file *file)
 193{
 194        if (file->f_op == &hugetlbfs_file_operations)
 195                return 1;
 196        if (is_file_shm_hugepages(file))
 197                return 1;
 198
 199        return 0;
 200}
 201
 202
 203#else /* !CONFIG_HUGETLBFS */
 204
 205#define is_file_hugepages(file)                 0
 206static inline struct file *
 207hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
 208                struct user_struct **user, int creat_flags,
 209                int page_size_log)
 210{
 211        return ERR_PTR(-ENOSYS);
 212}
 213
 214#endif /* !CONFIG_HUGETLBFS */
 215
 216#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 217unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 218                                        unsigned long len, unsigned long pgoff,
 219                                        unsigned long flags);
 220#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 221
 222#ifdef CONFIG_HUGETLB_PAGE
 223
 224#define HSTATE_NAME_LEN 32
 225/* Defines one hugetlb page size */
 226struct hstate {
 227        int next_nid_to_alloc;
 228        int next_nid_to_free;
 229        unsigned int order;
 230        unsigned long mask;
 231        unsigned long max_huge_pages;
 232        unsigned long nr_huge_pages;
 233        unsigned long free_huge_pages;
 234        unsigned long resv_huge_pages;
 235        unsigned long surplus_huge_pages;
 236        unsigned long nr_overcommit_huge_pages;
 237        struct list_head hugepage_activelist;
 238        struct list_head hugepage_freelists[MAX_NUMNODES];
 239        unsigned int nr_huge_pages_node[MAX_NUMNODES];
 240        unsigned int free_huge_pages_node[MAX_NUMNODES];
 241        unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 242#ifdef CONFIG_CGROUP_HUGETLB
 243        /* cgroup control files */
 244        struct cftype cgroup_files[5];
 245#endif
 246        char name[HSTATE_NAME_LEN];
 247};
 248
 249struct huge_bootmem_page {
 250        struct list_head list;
 251        struct hstate *hstate;
 252#ifdef CONFIG_HIGHMEM
 253        phys_addr_t phys;
 254#endif
 255};
 256
 257struct page *alloc_huge_page_node(struct hstate *h, int nid);
 258
 259/* arch callback */
 260int __init alloc_bootmem_huge_page(struct hstate *h);
 261
 262void __init hugetlb_add_hstate(unsigned order);
 263struct hstate *size_to_hstate(unsigned long size);
 264
 265#ifndef HUGE_MAX_HSTATE
 266#define HUGE_MAX_HSTATE 1
 267#endif
 268
 269extern struct hstate hstates[HUGE_MAX_HSTATE];
 270extern unsigned int default_hstate_idx;
 271
 272#define default_hstate (hstates[default_hstate_idx])
 273
 274static inline struct hstate *hstate_inode(struct inode *i)
 275{
 276        struct hugetlbfs_sb_info *hsb;
 277        hsb = HUGETLBFS_SB(i->i_sb);
 278        return hsb->hstate;
 279}
 280
 281static inline struct hstate *hstate_file(struct file *f)
 282{
 283        return hstate_inode(file_inode(f));
 284}
 285
 286static inline struct hstate *hstate_sizelog(int page_size_log)
 287{
 288        if (!page_size_log)
 289                return &default_hstate;
 290        return size_to_hstate(1 << page_size_log);
 291}
 292
 293static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 294{
 295        return hstate_file(vma->vm_file);
 296}
 297
 298static inline unsigned long huge_page_size(struct hstate *h)
 299{
 300        return (unsigned long)PAGE_SIZE << h->order;
 301}
 302
 303extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 304
 305extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 306
 307static inline unsigned long huge_page_mask(struct hstate *h)
 308{
 309        return h->mask;
 310}
 311
 312static inline unsigned int huge_page_order(struct hstate *h)
 313{
 314        return h->order;
 315}
 316
 317static inline unsigned huge_page_shift(struct hstate *h)
 318{
 319        return h->order + PAGE_SHIFT;
 320}
 321
 322static inline unsigned int pages_per_huge_page(struct hstate *h)
 323{
 324        return 1 << h->order;
 325}
 326
 327static inline unsigned int blocks_per_huge_page(struct hstate *h)
 328{
 329        return huge_page_size(h) / 512;
 330}
 331
 332#include <asm/hugetlb.h>
 333
 334#ifndef arch_make_huge_pte
 335static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 336                                       struct page *page, int writable)
 337{
 338        return entry;
 339}
 340#endif
 341
 342static inline struct hstate *page_hstate(struct page *page)
 343{
 344        return size_to_hstate(PAGE_SIZE << compound_order(page));
 345}
 346
 347static inline unsigned hstate_index_to_shift(unsigned index)
 348{
 349        return hstates[index].order + PAGE_SHIFT;
 350}
 351
 352static inline int hstate_index(struct hstate *h)
 353{
 354        return h - hstates;
 355}
 356
 357#else   /* CONFIG_HUGETLB_PAGE */
 358struct hstate {};
 359#define alloc_huge_page_node(h, nid) NULL
 360#define alloc_bootmem_huge_page(h) NULL
 361#define hstate_file(f) NULL
 362#define hstate_sizelog(s) NULL
 363#define hstate_vma(v) NULL
 364#define hstate_inode(i) NULL
 365#define huge_page_size(h) PAGE_SIZE
 366#define huge_page_mask(h) PAGE_MASK
 367#define vma_kernel_pagesize(v) PAGE_SIZE
 368#define vma_mmu_pagesize(v) PAGE_SIZE
 369#define huge_page_order(h) 0
 370#define huge_page_shift(h) PAGE_SHIFT
 371static inline unsigned int pages_per_huge_page(struct hstate *h)
 372{
 373        return 1;
 374}
 375#define hstate_index_to_shift(index) 0
 376#define hstate_index(h) 0
 377#endif  /* CONFIG_HUGETLB_PAGE */
 378
 379#endif /* _LINUX_HUGETLB_H */
 380
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