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 <linux/shm.h>
   8 #include <asm/tlbflush.h>
   9
  10 struct ctl_table;
  11
  12 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  13 {
  14         return vma->vm_flags & VM_HUGETLB;
  15 }
  16
  17 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  18 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  19 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
  20 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  21 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  22 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  23 int hugetlb_report_meminfo(char *);
  24 int hugetlb_report_node_meminfo(int, char *);
  25 unsigned long hugetlb_total_pages(void);
  26 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  27                         unsigned long address, int write_access);
  28 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
  29 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  30
  31 extern unsigned long max_huge_pages;
  32 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  33 extern int sysctl_hugetlb_shm_group;
  34
  35 /* arch callbacks */
  36
  37 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  38 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  39 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  40 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  41                               int write);
  42 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  43                                 pmd_t *pmd, int write);
  44 int pmd_huge(pmd_t pmd);
  45 void hugetlb_change_protection(struct vm_area_struct *vma,
  46                 unsigned long address, unsigned long end, pgprot_t newprot);
  47
  48 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  49 #define is_hugepage_only_range(mm, addr, len)   0
  50 #endif
  51
  52 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  53 #define hugetlb_free_pgd_range  free_pgd_range
  54 #else
  55 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
  56                             unsigned long end, unsigned long floor,
  57                             unsigned long ceiling);
  58 #endif
  59
  60 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  61 /*
  62  * If the arch doesn't supply something else, assume that hugepage
  63  * size aligned regions are ok without further preparation.
  64  */
  65 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
  66                                                 pgoff_t pgoff)
  67 {
  68         if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
  69                 return -EINVAL;
  70         if (len & ~HPAGE_MASK)
  71                 return -EINVAL;
  72         if (addr & ~HPAGE_MASK)
  73                 return -EINVAL;
  74         return 0;
  75 }
  76 #else
  77 int prepare_hugepage_range(unsigned long addr, unsigned long len,
  78                                                 pgoff_t pgoff);
  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
  85 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  86                      pte_t *ptep, pte_t pte);
  87 pte_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
  94 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  95 #endif
  96
  97 #else /* !CONFIG_HUGETLB_PAGE */
  98
  99 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 100 {
 101         return 0;
 102 }
 103 static 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,pgoff)  (-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
 132 struct hugetlbfs_config {
 133         uid_t   uid;
 134         gid_t   gid;
 135         umode_t mode;
 136         long    nr_blocks;
 137         long    nr_inodes;
 138 };
 139
 140 struct 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
 149 struct hugetlbfs_inode_info {
 150         struct shared_policy policy;
 151         struct inode vfs_inode;
 152 };
 153
 154 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 155 {
 156         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 157 }
 158
 159 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 160 {
 161         return sb->s_fs_info;
 162 }
 163
 164 extern const struct file_operations hugetlbfs_file_operations;
 165 extern struct vm_operations_struct hugetlb_vm_ops;
 166 struct file *hugetlb_zero_setup(size_t);
 167 int hugetlb_get_quota(struct address_space *mapping);
 168 void hugetlb_put_quota(struct address_space *mapping);
 169
 170 static 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
 180 static 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_zero_setup(size)        ERR_PTR(-ENOSYS)
 189
 190 #endif /* !CONFIG_HUGETLBFS */
 191
 192 #endif /* _LINUX_HUGETLB_H */