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 #include <asm/hugetlb.h>
  12
  13 struct ctl_table;
  14
  15 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  16 {
  17         return vma->vm_flags & VM_HUGETLB;
  18 }
  19
  20 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  21 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  22 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  23 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  24 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  25 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
  26 void unmap_hugepage_range(struct vm_area_struct *,
  27                         unsigned long, unsigned long, struct page *);
  28 void __unmap_hugepage_range(struct vm_area_struct *,
  29                         unsigned long, unsigned long, struct page *);
  30 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  31 int hugetlb_report_meminfo(char *);
  32 int hugetlb_report_node_meminfo(int, char *);
  33 unsigned long hugetlb_total_pages(void);
  34 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  35                         unsigned long address, int write_access);
  36 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  37                                                 struct vm_area_struct *vma);
  38 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  39
  40 extern unsigned long max_huge_pages;
  41 extern unsigned long sysctl_overcommit_huge_pages;
  42 extern unsigned long hugepages_treat_as_movable;
  43 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  44 extern int sysctl_hugetlb_shm_group;
  45
  46 /* arch callbacks */
  47
  48 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  49 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  50 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  51 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  52                               int write);
  53 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  54                                 pmd_t *pmd, int write);
  55 int pmd_huge(pmd_t pmd);
  56 void hugetlb_change_protection(struct vm_area_struct *vma,
  57                 unsigned long address, unsigned long end, pgprot_t newprot);
  58
  59 #else /* !CONFIG_HUGETLB_PAGE */
  60
  61 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  62 {
  63         return 0;
  64 }
  65
  66 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  67 {
  68 }
  69
  70 static inline unsigned long hugetlb_total_pages(void)
  71 {
  72         return 0;
  73 }
  74
  75 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  76 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  77 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  78 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  79 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  80 #define hugetlb_report_meminfo(buf)             0
  81 #define hugetlb_report_node_meminfo(n, buf)     0
  82 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  83 #define prepare_hugepage_range(addr,len)        (-EINVAL)
  84 #define pmd_huge(x)     0
  85 #define is_hugepage_only_range(mm, addr, len)   0
  86 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
  87 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
  88
  89 #define hugetlb_change_protection(vma, address, end, newprot)
  90
  91 #ifndef HPAGE_MASK
  92 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
  93 #define HPAGE_SIZE      PAGE_SIZE
  94 #endif
  95
  96 #endif /* !CONFIG_HUGETLB_PAGE */
  97
  98 #ifdef CONFIG_HUGETLBFS
  99 struct hugetlbfs_config {
 100         uid_t   uid;
 101         gid_t   gid;
 102         umode_t mode;
 103         long    nr_blocks;
 104         long    nr_inodes;
 105 };
 106
 107 struct hugetlbfs_sb_info {
 108         long    max_blocks;   /* blocks allowed */
 109         long    free_blocks;  /* blocks free */
 110         long    max_inodes;   /* inodes allowed */
 111         long    free_inodes;  /* inodes free */
 112         spinlock_t      stat_lock;
 113 };
 114
 115
 116 struct hugetlbfs_inode_info {
 117         struct shared_policy policy;
 118         struct inode vfs_inode;
 119 };
 120
 121 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 122 {
 123         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 124 }
 125
 126 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 127 {
 128         return sb->s_fs_info;
 129 }
 130
 131 extern const struct file_operations hugetlbfs_file_operations;
 132 extern struct vm_operations_struct hugetlb_vm_ops;
 133 struct file *hugetlb_file_setup(const char *name, size_t);
 134 int hugetlb_get_quota(struct address_space *mapping, long delta);
 135 void hugetlb_put_quota(struct address_space *mapping, long delta);
 136
 137 #define BLOCKS_PER_HUGEPAGE     (HPAGE_SIZE / 512)
 138
 139 static inline int is_file_hugepages(struct file *file)
 140 {
 141         if (file->f_op == &hugetlbfs_file_operations)
 142                 return 1;
 143         if (is_file_shm_hugepages(file))
 144                 return 1;
 145
 146         return 0;
 147 }
 148
 149 static inline void set_file_hugepages(struct file *file)
 150 {
 151         file->f_op = &hugetlbfs_file_operations;
 152 }
 153 #else /* !CONFIG_HUGETLBFS */
 154
 155 #define is_file_hugepages(file)         0
 156 #define set_file_hugepages(file)        BUG()
 157 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 158
 159 #endif /* !CONFIG_HUGETLBFS */
 160
 161 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 162 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 163                                         unsigned long len, unsigned long pgoff,
 164                                         unsigned long flags);
 165 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 166
 167 #endif /* _LINUX_HUGETLB_H */