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 *);
  46int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  47                        struct page **, struct vm_area_struct **,
  48                        unsigned long *, int *, int, unsigned int flags);
  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);
  90void 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
 135#define hugetlb_change_protection(vma, address, end, newprot)
 136
 137static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 138                        struct vm_area_struct *vma, unsigned long start,
 139                        unsigned long end, struct page *ref_page)
 140{
 141        BUG();
 142}
 143
 144static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 145                        struct vm_area_struct *vma, unsigned long start,
 146                        unsigned long end, struct page *ref_page)
 147{
 148        BUG();
 149}
 150
 151#endif /* !CONFIG_HUGETLB_PAGE */
 152
 153#define HUGETLB_ANON_FILE "anon_hugepage"
 154
 155enum {
 156        /*
 157         * The file will be used as an shm file so shmfs accounting rules
 158         * apply
 159         */
 160        HUGETLB_SHMFS_INODE     = 1,
 161        /*
 162         * The file is being created on the internal vfs mount and shmfs
 163         * accounting rules do not apply
 164         */
 165        HUGETLB_ANONHUGE_INODE  = 2,
 166};
 167
 168#ifdef CONFIG_HUGETLBFS
 169struct hugetlbfs_sb_info {
 170        long    max_inodes;   /* inodes allowed */
 171        long    free_inodes;  /* inodes free */
 172        spinlock_t      stat_lock;
 173        struct hstate *hstate;
 174        struct hugepage_subpool *spool;
 175};
 176
 177static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 178{
 179        return sb->s_fs_info;
 180}
 181
 182extern const struct file_operations hugetlbfs_file_operations;
 183extern const struct vm_operations_struct hugetlb_vm_ops;
 184struct file *hugetlb_file_setup(const char *name, unsigned long addr,
 185                                size_t size, vm_flags_t acct,
 186                                struct user_struct **user, int creat_flags);
 187
 188static inline int is_file_hugepages(struct file *file)
 189{
 190        if (file->f_op == &hugetlbfs_file_operations)
 191                return 1;
 192        if (is_file_shm_hugepages(file))
 193                return 1;
 194
 195        return 0;
 196}
 197
 198#else /* !CONFIG_HUGETLBFS */
 199
 200#define is_file_hugepages(file)                 0
 201static inline struct file *
 202hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
 203                vm_flags_t acctflag, struct user_struct **user, int creat_flags)
 204{
 205        return ERR_PTR(-ENOSYS);
 206}
 207
 208#endif /* !CONFIG_HUGETLBFS */
 209
 210#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 211unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 212                                        unsigned long len, unsigned long pgoff,
 213                                        unsigned long flags);
 214#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 215
 216#ifdef CONFIG_HUGETLB_PAGE
 217
 218#define HSTATE_NAME_LEN 32
 219/* Defines one hugetlb page size */
 220struct hstate {
 221        int next_nid_to_alloc;
 222        int next_nid_to_free;
 223        unsigned int order;
 224        unsigned long mask;
 225        unsigned long max_huge_pages;
 226        unsigned long nr_huge_pages;
 227        unsigned long free_huge_pages;
 228        unsigned long resv_huge_pages;
 229        unsigned long surplus_huge_pages;
 230        unsigned long nr_overcommit_huge_pages;
 231        struct list_head hugepage_activelist;
 232        struct list_head hugepage_freelists[MAX_NUMNODES];
 233        unsigned int nr_huge_pages_node[MAX_NUMNODES];
 234        unsigned int free_huge_pages_node[MAX_NUMNODES];
 235        unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 236#ifdef CONFIG_CGROUP_HUGETLB
 237        /* cgroup control files */
 238        struct cftype cgroup_files[5];
 239#endif
 240        char name[HSTATE_NAME_LEN];
 241};
 242
 243struct huge_bootmem_page {
 244        struct list_head list;
 245        struct hstate *hstate;
 246#ifdef CONFIG_HIGHMEM
 247        phys_addr_t phys;
 248#endif
 249};
 250
 251struct page *alloc_huge_page_node(struct hstate *h, int nid);
 252
 253/* arch callback */
 254int __init alloc_bootmem_huge_page(struct hstate *h);
 255
 256void __init hugetlb_add_hstate(unsigned order);
 257struct hstate *size_to_hstate(unsigned long size);
 258
 259#ifndef HUGE_MAX_HSTATE
 260#define HUGE_MAX_HSTATE 1
 261#endif
 262
 263extern struct hstate hstates[HUGE_MAX_HSTATE];
 264extern unsigned int default_hstate_idx;
 265
 266#define default_hstate (hstates[default_hstate_idx])
 267
 268static inline struct hstate *hstate_inode(struct inode *i)
 269{
 270        struct hugetlbfs_sb_info *hsb;
 271        hsb = HUGETLBFS_SB(i->i_sb);
 272        return hsb->hstate;
 273}
 274
 275static inline struct hstate *hstate_file(struct file *f)
 276{
 277        return hstate_inode(f->f_dentry->d_inode);
 278}
 279
 280static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 281{
 282        return hstate_file(vma->vm_file);
 283}
 284
 285static inline unsigned long huge_page_size(struct hstate *h)
 286{
 287        return (unsigned long)PAGE_SIZE << h->order;
 288}
 289
 290extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 291
 292extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 293
 294static inline unsigned long huge_page_mask(struct hstate *h)
 295{
 296        return h->mask;
 297}
 298
 299static inline unsigned int huge_page_order(struct hstate *h)
 300{
 301        return h->order;
 302}
 303
 304static inline unsigned huge_page_shift(struct hstate *h)
 305{
 306        return h->order + PAGE_SHIFT;
 307}
 308
 309static inline unsigned int pages_per_huge_page(struct hstate *h)
 310{
 311        return 1 << h->order;
 312}
 313
 314static inline unsigned int blocks_per_huge_page(struct hstate *h)
 315{
 316        return huge_page_size(h) / 512;
 317}
 318
 319#include <asm/hugetlb.h>
 320
 321#ifndef arch_make_huge_pte
 322static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 323                                       struct page *page, int writable)
 324{
 325        return entry;
 326}
 327#endif
 328
 329static inline struct hstate *page_hstate(struct page *page)
 330{
 331        return size_to_hstate(PAGE_SIZE << compound_order(page));
 332}
 333
 334static inline unsigned hstate_index_to_shift(unsigned index)
 335{
 336        return hstates[index].order + PAGE_SHIFT;
 337}
 338
 339static inline int hstate_index(struct hstate *h)
 340{
 341        return h - hstates;
 342}
 343
 344#else
 345struct hstate {};
 346#define alloc_huge_page_node(h, nid) NULL
 347#define alloc_bootmem_huge_page(h) NULL
 348#define hstate_file(f) NULL
 349#define hstate_vma(v) NULL
 350#define hstate_inode(i) NULL
 351#define huge_page_size(h) PAGE_SIZE
 352#define huge_page_mask(h) PAGE_MASK
 353#define vma_kernel_pagesize(v) PAGE_SIZE
 354#define vma_mmu_pagesize(v) PAGE_SIZE
 355#define huge_page_order(h) 0
 356#define huge_page_shift(h) PAGE_SHIFT
 357static inline unsigned int pages_per_huge_page(struct hstate *h)
 358{
 359        return 1;
 360}
 361#define hstate_index_to_shift(index) 0
 362#define hstate_index(h) 0
 363#endif
 364
 365#endif /* _LINUX_HUGETLB_H */
 366
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