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 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  21 int hugetlb_report_meminfo(char *);
  22 int hugetlb_report_node_meminfo(int, char *);
  23 unsigned long hugetlb_total_pages(void);
  24 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  25                         unsigned long address, int write_access);
  26
  27 extern unsigned long max_huge_pages;
  28 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  29 extern int sysctl_hugetlb_shm_group;
  30
  31 /* arch callbacks */
  32
  33 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  34 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  35 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  36                               int write);
  37 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  38                                 pmd_t *pmd, int write);
  39 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
  40 int pmd_huge(pmd_t pmd);
  41 void hugetlb_change_protection(struct vm_area_struct *vma,
  42                 unsigned long address, unsigned long end, pgprot_t newprot);
  43
  44 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  45 #define is_hugepage_only_range(mm, addr, len)   0
  46 #endif
  47
  48 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  49 #define hugetlb_free_pgd_range  free_pgd_range
  50 #endif
  51
  52 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  53 #define prepare_hugepage_range(addr, len)       \
  54         is_aligned_hugepage_range(addr, len)
  55 #else
  56 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  57 #endif
  58
  59 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  60 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  61 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  62 #else
  63 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  64                      pte_t *ptep, pte_t pte);
  65 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  66                               pte_t *ptep);
  67 #endif
  68
  69 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  70 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  71 #else
  72 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  73 #endif
  74
  75 #else /* !CONFIG_HUGETLB_PAGE */
  76
  77 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  78 {
  79         return 0;
  80 }
  81 static inline unsigned long hugetlb_total_pages(void)
  82 {
  83         return 0;
  84 }
  85
  86 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
  87 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  88 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  89 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  90 #define unmap_hugepage_range(vma, start, end)   BUG()
  91 #define hugetlb_report_meminfo(buf)             0
  92 #define hugetlb_report_node_meminfo(n, buf)     0
  93 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  94 #define is_aligned_hugepage_range(addr, len)    0
  95 #define prepare_hugepage_range(addr, len)       (-EINVAL)
  96 #define pmd_huge(x)     0
  97 #define is_hugepage_only_range(mm, addr, len)   0
  98 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
  99 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 100
 101 #define hugetlb_change_protection(vma, address, end, newprot)
 102
 103 #ifndef HPAGE_MASK
 104 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 105 #define HPAGE_SIZE      PAGE_SIZE
 106 #endif
 107
 108 #endif /* !CONFIG_HUGETLB_PAGE */
 109
 110 #ifdef CONFIG_HUGETLBFS
 111 struct hugetlbfs_config {
 112         uid_t   uid;
 113         gid_t   gid;
 114         umode_t mode;
 115         long    nr_blocks;
 116         long    nr_inodes;
 117 };
 118
 119 struct hugetlbfs_sb_info {
 120         long    max_blocks;   /* blocks allowed */
 121         long    free_blocks;  /* blocks free */
 122         long    max_inodes;   /* inodes allowed */
 123         long    free_inodes;  /* inodes free */
 124         spinlock_t      stat_lock;
 125 };
 126
 127
 128 struct hugetlbfs_inode_info {
 129         struct shared_policy policy;
 130         /* Protected by the (global) hugetlb_lock */
 131         unsigned long prereserved_hpages;
 132         struct inode vfs_inode;
 133 };
 134
 135 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 136 {
 137         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 138 }
 139
 140 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 141 {
 142         return sb->s_fs_info;
 143 }
 144
 145 extern struct file_operations hugetlbfs_file_operations;
 146 extern struct vm_operations_struct hugetlb_vm_ops;
 147 struct file *hugetlb_zero_setup(size_t);
 148 int hugetlb_extend_reservation(struct hugetlbfs_inode_info *info,
 149                                unsigned long atleast_hpages);
 150 void hugetlb_truncate_reservation(struct hugetlbfs_inode_info *info,
 151                                   unsigned long atmost_hpages);
 152 int hugetlb_get_quota(struct address_space *mapping);
 153 void hugetlb_put_quota(struct address_space *mapping);
 154
 155 static inline int is_file_hugepages(struct file *file)
 156 {
 157         return file->f_op == &hugetlbfs_file_operations;
 158 }
 159
 160 static inline void set_file_hugepages(struct file *file)
 161 {
 162         file->f_op = &hugetlbfs_file_operations;
 163 }
 164 #else /* !CONFIG_HUGETLBFS */
 165
 166 #define is_file_hugepages(file)         0
 167 #define set_file_hugepages(file)        BUG()
 168 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
 169
 170 #endif /* !CONFIG_HUGETLBFS */
 171
 172 #endif /* _LINUX_HUGETLB_H */