include/linux/hugetlb.h

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