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);
  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 const unsigned long hugetlb_zero, hugetlb_infinity;
  37extern int sysctl_hugetlb_shm_group;
  38
  39/* arch callbacks */
  40
  41pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  42pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  43int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  44struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  45                              int write);
  46struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  47                                pmd_t *pmd, int write);
  48int pmd_huge(pmd_t pmd);
  49void hugetlb_change_protection(struct vm_area_struct *vma,
  50                unsigned long address, unsigned long end, pgprot_t newprot);
  51
  52#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  53#define is_hugepage_only_range(mm, addr, len)   0
  54#endif
  55
  56#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  57#define hugetlb_free_pgd_range  free_pgd_range
  58#else
  59void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
  60                            unsigned long end, unsigned long floor,
  61                            unsigned long ceiling);
  62#endif
  63
  64#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  65/*
  66 * If the arch doesn't supply something else, assume that hugepage
  67 * size aligned regions are ok without further preparation.
  68 */
  69static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
  70{
  71        if (len & ~HPAGE_MASK)
  72                return -EINVAL;
  73        if (addr & ~HPAGE_MASK)
  74                return -EINVAL;
  75        return 0;
  76}
  77#else
  78int prepare_hugepage_range(unsigned long addr, unsigned long len);
  79#endif
  80
  81#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  82#define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  83#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  84#else
  85void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  86                     pte_t *ptep, pte_t pte);
  87pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  88                              pte_t *ptep);
  89#endif
  90
  91#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  92#define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  93#else
  94void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  95#endif
  96
  97#else /* !CONFIG_HUGETLB_PAGE */
  98
  99static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 100{
 101        return 0;
 102}
 103static inline unsigned long hugetlb_total_pages(void)
 104{
 105        return 0;
 106}
 107
 108#define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
 109#define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 110#define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 111#define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
 112#define unmap_hugepage_range(vma, start, end)   BUG()
 113#define hugetlb_report_meminfo(buf)             0
 114#define hugetlb_report_node_meminfo(n, buf)     0
 115#define follow_huge_pmd(mm, addr, pmd, write)   NULL
 116#define prepare_hugepage_range(addr,len)        (-EINVAL)
 117#define pmd_huge(x)     0
 118#define is_hugepage_only_range(mm, addr, len)   0
 119#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 120#define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 121
 122#define hugetlb_change_protection(vma, address, end, newprot)
 123
 124#ifndef HPAGE_MASK
 125#define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 126#define HPAGE_SIZE      PAGE_SIZE
 127#endif
 128
 129#endif /* !CONFIG_HUGETLB_PAGE */
 130
 131#ifdef CONFIG_HUGETLBFS
 132struct hugetlbfs_config {
 133        uid_t   uid;
 134        gid_t   gid;
 135        umode_t mode;
 136        long    nr_blocks;
 137        long    nr_inodes;
 138};
 139
 140struct hugetlbfs_sb_info {
 141        long    max_blocks;   /* blocks allowed */
 142        long    free_blocks;  /* blocks free */
 143        long    max_inodes;   /* inodes allowed */
 144        long    free_inodes;  /* inodes free */
 145        spinlock_t      stat_lock;
 146};
 147
 148
 149struct hugetlbfs_inode_info {
 150        struct shared_policy policy;
 151        struct inode vfs_inode;
 152};
 153
 154static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 155{
 156        return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 157}
 158
 159static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 160{
 161        return sb->s_fs_info;
 162}
 163
 164extern const struct file_operations hugetlbfs_file_operations;
 165extern struct vm_operations_struct hugetlb_vm_ops;
 166struct file *hugetlb_file_setup(const char *name, size_t);
 167int hugetlb_get_quota(struct address_space *mapping);
 168void hugetlb_put_quota(struct address_space *mapping);
 169
 170static inline int is_file_hugepages(struct file *file)
 171{
 172        if (file->f_op == &hugetlbfs_file_operations)
 173                return 1;
 174        if (is_file_shm_hugepages(file))
 175                return 1;
 176
 177        return 0;
 178}
 179
 180static inline void set_file_hugepages(struct file *file)
 181{
 182        file->f_op = &hugetlbfs_file_operations;
 183}
 184#else /* !CONFIG_HUGETLBFS */
 185
 186#define is_file_hugepages(file)         0
 187#define set_file_hugepages(file)        BUG()
 188#define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 189
 190#endif /* !CONFIG_HUGETLBFS */
 191
 192#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 193unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 194                                        unsigned long len, unsigned long pgoff,
 195                                        unsigned long flags);
 196#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 197
 198#endif /* _LINUX_HUGETLB_H */
 199