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