LXR linux/include/linux/hugetlb.h

   1#ifndef _LINUX_HUGETLB_H
   2#define _LINUX_HUGETLB_H
   3
   4#include <linux/fs.h>
   5
   6#ifdef CONFIG_HUGETLB_PAGE
   7
   8#include <linux/mempolicy.h>
   9#include <linux/shm.h>
  10#include <asm/tlbflush.h>
  11
  12struct ctl_table;
  13
  14static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  15{
  16        return vma->vm_flags & VM_HUGETLB;
  17}
  18
  19int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  20int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  21int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  22int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
  23void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  24void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  25int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  26int hugetlb_report_meminfo(char *);
  27int hugetlb_report_node_meminfo(int, char *);
  28unsigned long hugetlb_total_pages(void);
  29int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  30                        unsigned long address, int write_access);
  31int hugetlb_reserve_pages(struct inode *inode, long from, long to);
  32void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  33
  34extern unsigned long max_huge_pages;
  35extern unsigned long hugepages_treat_as_movable;
  36extern unsigned long nr_overcommit_huge_pages;
  37extern const unsigned long hugetlb_zero, hugetlb_infinity;
  38extern int sysctl_hugetlb_shm_group;
  39
  40/* arch callbacks */
  41
  42pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  43pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  44int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  45struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  46                              int write);
  47struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  48                                pmd_t *pmd, int write);
  49int pmd_huge(pmd_t pmd);
  50void hugetlb_change_protection(struct vm_area_struct *vma,
  51                unsigned long address, unsigned long end, pgprot_t newprot);
  52
  53#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  54#define is_hugepage_only_range(mm, addr, len)   0
  55#endif
  56
  57#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  58#define hugetlb_free_pgd_range  free_pgd_range
  59#else
  60void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
  61                            unsigned long end, unsigned long floor,
  62                            unsigned long ceiling);
  63#endif
  64
  65#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  66/*
  67 * If the arch doesn't supply something else, assume that hugepage
  68 * size aligned regions are ok without further preparation.
  69 */
  70static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
  71{
  72        if (len & ~HPAGE_MASK)
  73                return -EINVAL;
  74        if (addr & ~HPAGE_MASK)
  75                return -EINVAL;
  76        return 0;
  77}
  78#else
  79int prepare_hugepage_range(unsigned long addr, unsigned long len);
  80#endif
  81
  82#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  83#define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  84#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  85#else
  86void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  87                     pte_t *ptep, pte_t pte);
  88pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  89                              pte_t *ptep);
  90#endif
  91
  92#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  93#define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  94#else
  95void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  96#endif
  97
  98#else /* !CONFIG_HUGETLB_PAGE */
  99
 100static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 101{
 102        return 0;
 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; })
 113#define unmap_hugepage_range(vma, start, end)   BUG()
 114#define hugetlb_report_meminfo(buf)             0
 115#define hugetlb_report_node_meminfo(n, buf)     0
 116#define follow_huge_pmd(mm, addr, pmd, write)   NULL
 117#define prepare_hugepage_range(addr,len)        (-EINVAL)
 118#define pmd_huge(x)     0
 119#define is_hugepage_only_range(mm, addr, len)   0
 120#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 121#define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 122
 123#define hugetlb_change_protection(vma, address, end, newprot)
 124
 125#ifndef HPAGE_MASK
 126#define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 127#define HPAGE_SIZE      PAGE_SIZE
 128#endif
 129
 130#endif /* !CONFIG_HUGETLB_PAGE */
 131
 132#ifdef CONFIG_HUGETLBFS
 133struct hugetlbfs_config {
 134        uid_t   uid;
 135        gid_t   gid;
 136        umode_t mode;
 137        long    nr_blocks;
 138        long    nr_inodes;
 139};
 140
 141struct hugetlbfs_sb_info {
 142        long    max_blocks;   /* blocks allowed */
 143        long    free_blocks;  /* blocks free */
 144        long    max_inodes;   /* inodes allowed */
 145        long    free_inodes;  /* inodes free */
 146        spinlock_t      stat_lock;
 147};
 148
 149
 150struct hugetlbfs_inode_info {
 151        struct shared_policy policy;
 152        struct inode vfs_inode;
 153};
 154
 155static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 156{
 157        return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 158}
 159
 160static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 161{
 162        return sb->s_fs_info;
 163}
 164
 165extern const struct file_operations hugetlbfs_file_operations;
 166extern struct vm_operations_struct hugetlb_vm_ops;
 167struct file *hugetlb_file_setup(const char *name, size_t);
 168int hugetlb_get_quota(struct address_space *mapping, long delta);
 169void hugetlb_put_quota(struct address_space *mapping, long delta);
 170
 171#define BLOCKS_PER_HUGEPAGE     (HPAGE_SIZE / 512)
 172
 173static inline int is_file_hugepages(struct file *file)
 174{
 175        if (file->f_op == &hugetlbfs_file_operations)
 176                return 1;
 177        if (is_file_shm_hugepages(file))
 178                return 1;
 179
 180        return 0;
 181}
 182
 183static inline void set_file_hugepages(struct file *file)
 184{
 185        file->f_op = &hugetlbfs_file_operations;
 186}
 187#else /* !CONFIG_HUGETLBFS */
 188
 189#define is_file_hugepages(file)         0
 190#define set_file_hugepages(file)        BUG()
 191#define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 192
 193#endif /* !CONFIG_HUGETLBFS */
 194
 195#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 196unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 197                                        unsigned long len, unsigned long pgoff,
 198                                        unsigned long flags);
 199#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 200
 201#endif /* _LINUX_HUGETLB_H */
 202