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);
  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, unsigned long addr,
 189                                size_t size, vm_flags_t acct,
 190                                struct user_struct **user, int creat_flags,
 191                                int page_size_log);
 192
 193static inline int is_file_hugepages(struct file *file)
 194{
 195        if (file->f_op == &hugetlbfs_file_operations)
 196                return 1;
 197        if (is_file_shm_hugepages(file))
 198                return 1;
 199
 200        return 0;
 201}
 202
 203
 204#else /* !CONFIG_HUGETLBFS */
 205
 206#define is_file_hugepages(file)                 0
 207static inline struct file *
 208hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
 209                vm_flags_t acctflag, struct user_struct **user, int creat_flags,
 210                int page_size_log)
 211{
 212        return ERR_PTR(-ENOSYS);
 213}
 214
 215#endif /* !CONFIG_HUGETLBFS */
 216
 217#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 218unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 219                                        unsigned long len, unsigned long pgoff,
 220                                        unsigned long flags);
 221#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 222
 223#ifdef CONFIG_HUGETLB_PAGE
 224
 225#define HSTATE_NAME_LEN 32
 226/* Defines one hugetlb page size */
 227struct hstate {
 228        int next_nid_to_alloc;
 229        int next_nid_to_free;
 230        unsigned int order;
 231        unsigned long mask;
 232        unsigned long max_huge_pages;
 233        unsigned long nr_huge_pages;
 234        unsigned long free_huge_pages;
 235        unsigned long resv_huge_pages;
 236        unsigned long surplus_huge_pages;
 237        unsigned long nr_overcommit_huge_pages;
 238        struct list_head hugepage_activelist;
 239        struct list_head hugepage_freelists[MAX_NUMNODES];
 240        unsigned int nr_huge_pages_node[MAX_NUMNODES];
 241        unsigned int free_huge_pages_node[MAX_NUMNODES];
 242        unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 243#ifdef CONFIG_CGROUP_HUGETLB
 244        /* cgroup control files */
 245        struct cftype cgroup_files[5];
 246#endif
 247        char name[HSTATE_NAME_LEN];
 248};
 249
 250struct huge_bootmem_page {
 251        struct list_head list;
 252        struct hstate *hstate;
 253#ifdef CONFIG_HIGHMEM
 254        phys_addr_t phys;
 255#endif
 256};
 257
 258struct page *alloc_huge_page_node(struct hstate *h, int nid);
 259
 260/* arch callback */
 261int __init alloc_bootmem_huge_page(struct hstate *h);
 262
 263void __init hugetlb_add_hstate(unsigned order);
 264struct hstate *size_to_hstate(unsigned long size);
 265
 266#ifndef HUGE_MAX_HSTATE
 267#define HUGE_MAX_HSTATE 1
 268#endif
 269
 270extern struct hstate hstates[HUGE_MAX_HSTATE];
 271extern unsigned int default_hstate_idx;
 272
 273#define default_hstate (hstates[default_hstate_idx])
 274
 275static inline struct hstate *hstate_inode(struct inode *i)
 276{
 277        struct hugetlbfs_sb_info *hsb;
 278        hsb = HUGETLBFS_SB(i->i_sb);
 279        return hsb->hstate;
 280}
 281
 282static inline struct hstate *hstate_file(struct file *f)
 283{
 284        return hstate_inode(f->f_dentry->d_inode);
 285}
 286
 287static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 288{
 289        return hstate_file(vma->vm_file);
 290}
 291
 292static inline unsigned long huge_page_size(struct hstate *h)
 293{
 294        return (unsigned long)PAGE_SIZE << h->order;
 295}
 296
 297extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 298
 299extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 300
 301static inline unsigned long huge_page_mask(struct hstate *h)
 302{
 303        return h->mask;
 304}
 305
 306static inline unsigned int huge_page_order(struct hstate *h)
 307{
 308        return h->order;
 309}
 310
 311static inline unsigned huge_page_shift(struct hstate *h)
 312{
 313        return h->order + PAGE_SHIFT;
 314}
 315
 316static inline unsigned int pages_per_huge_page(struct hstate *h)
 317{
 318        return 1 << h->order;
 319}
 320
 321static inline unsigned int blocks_per_huge_page(struct hstate *h)
 322{
 323        return huge_page_size(h) / 512;
 324}
 325
 326#include <asm/hugetlb.h>
 327
 328#ifndef arch_make_huge_pte
 329static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 330                                       struct page *page, int writable)
 331{
 332        return entry;
 333}
 334#endif
 335
 336static inline struct hstate *page_hstate(struct page *page)
 337{
 338        return size_to_hstate(PAGE_SIZE << compound_order(page));
 339}
 340
 341static inline unsigned hstate_index_to_shift(unsigned index)
 342{
 343        return hstates[index].order + PAGE_SHIFT;
 344}
 345
 346static inline int hstate_index(struct hstate *h)
 347{
 348        return h - hstates;
 349}
 350
 351#else
 352struct hstate {};
 353#define alloc_huge_page_node(h, nid) NULL
 354#define alloc_bootmem_huge_page(h) NULL
 355#define hstate_file(f) NULL
 356#define hstate_vma(v) NULL
 357#define hstate_inode(i) NULL
 358#define huge_page_size(h) PAGE_SIZE
 359#define huge_page_mask(h) PAGE_MASK
 360#define vma_kernel_pagesize(v) PAGE_SIZE
 361#define vma_mmu_pagesize(v) PAGE_SIZE
 362#define huge_page_order(h) 0
 363#define huge_page_shift(h) PAGE_SHIFT
 364static inline unsigned int pages_per_huge_page(struct hstate *h)
 365{
 366        return 1;
 367}
 368#define hstate_index_to_shift(index) 0
 369#define hstate_index(h) 0
 370#endif
 371
 372#endif /* _LINUX_HUGETLB_H */
 373
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