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
  12 struct ctl_table;
  13
  14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  15 {
  16         return vma->vm_flags & VM_HUGETLB;
  17 }
  18
  19 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  20 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  21 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  22 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  23 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
  24 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  25 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  26 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  27 int hugetlb_report_meminfo(char *);
  28 int hugetlb_report_node_meminfo(int, char *);
  29 unsigned long hugetlb_total_pages(void);
  30 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  31                         unsigned long address, int write_access);
  32 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
  33 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  34
  35 extern unsigned long max_huge_pages;
  36 extern unsigned long hugepages_treat_as_movable;
  37 extern unsigned long nr_overcommit_huge_pages;
  38 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  39 extern int sysctl_hugetlb_shm_group;
  40
  41 /* arch callbacks */
  42
  43 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  44 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  45 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  46 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  47                               int write);
  48 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  49                                 pmd_t *pmd, int write);
  50 int pmd_huge(pmd_t pmd);
  51 void hugetlb_change_protection(struct vm_area_struct *vma,
  52                 unsigned long address, unsigned long end, pgprot_t newprot);
  53
  54 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  55 #define is_hugepage_only_range(mm, addr, len)   0
  56 #endif
  57
  58 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  59 #define hugetlb_free_pgd_range  free_pgd_range
  60 #else
  61 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
  62                             unsigned long end, unsigned long floor,
  63                             unsigned long ceiling);
  64 #endif
  65
  66 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  67 /*
  68  * If the arch doesn't supply something else, assume that hugepage
  69  * size aligned regions are ok without further preparation.
  70  */
  71 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
  72 {
  73         if (len & ~HPAGE_MASK)
  74                 return -EINVAL;
  75         if (addr & ~HPAGE_MASK)
  76                 return -EINVAL;
  77         return 0;
  78 }
  79 #else
  80 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  81 #endif
  82
  83 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  84 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  85 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  86 #else
  87 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  88                      pte_t *ptep, pte_t pte);
  89 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  90                               pte_t *ptep);
  91 #endif
  92
  93 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  94 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  95 #else
  96 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  97 #endif
  98
  99 #else /* !CONFIG_HUGETLB_PAGE */
 100
 101 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 102 {
 103         return 0;
 104 }
 105 static inline unsigned long hugetlb_total_pages(void)
 106 {
 107         return 0;
 108 }
 109
 110 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
 111 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 112 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 113 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
 114 #define unmap_hugepage_range(vma, start, end)   BUG()
 115 #define hugetlb_report_meminfo(buf)             0
 116 #define hugetlb_report_node_meminfo(n, buf)     0
 117 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 118 #define prepare_hugepage_range(addr,len)        (-EINVAL)
 119 #define pmd_huge(x)     0
 120 #define is_hugepage_only_range(mm, addr, len)   0
 121 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 122 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 123
 124 #define hugetlb_change_protection(vma, address, end, newprot)
 125
 126 #ifndef HPAGE_MASK
 127 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 128 #define HPAGE_SIZE      PAGE_SIZE
 129 #endif
 130
 131 #endif /* !CONFIG_HUGETLB_PAGE */
 132
 133 #ifdef CONFIG_HUGETLBFS
 134 struct hugetlbfs_config {
 135         uid_t   uid;
 136         gid_t   gid;
 137         umode_t mode;
 138         long    nr_blocks;
 139         long    nr_inodes;
 140 };
 141
 142 struct hugetlbfs_sb_info {
 143         long    max_blocks;   /* blocks allowed */
 144         long    free_blocks;  /* blocks free */
 145         long    max_inodes;   /* inodes allowed */
 146         long    free_inodes;  /* inodes free */
 147         spinlock_t      stat_lock;
 148 };
 149
 150
 151 struct hugetlbfs_inode_info {
 152         struct shared_policy policy;
 153         struct inode vfs_inode;
 154 };
 155
 156 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 157 {
 158         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 159 }
 160
 161 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 162 {
 163         return sb->s_fs_info;
 164 }
 165
 166 extern const struct file_operations hugetlbfs_file_operations;
 167 extern struct vm_operations_struct hugetlb_vm_ops;
 168 struct file *hugetlb_file_setup(const char *name, size_t);
 169 int hugetlb_get_quota(struct address_space *mapping, long delta);
 170 void hugetlb_put_quota(struct address_space *mapping, long delta);
 171
 172 #define BLOCKS_PER_HUGEPAGE     (HPAGE_SIZE / 512)
 173
 174 static inline int is_file_hugepages(struct file *file)
 175 {
 176         if (file->f_op == &hugetlbfs_file_operations)
 177                 return 1;
 178         if (is_file_shm_hugepages(file))
 179                 return 1;
 180
 181         return 0;
 182 }
 183
 184 static inline void set_file_hugepages(struct file *file)
 185 {
 186         file->f_op = &hugetlbfs_file_operations;
 187 }
 188 #else /* !CONFIG_HUGETLBFS */
 189
 190 #define is_file_hugepages(file)         0
 191 #define set_file_hugepages(file)        BUG()
 192 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 193
 194 #endif /* !CONFIG_HUGETLBFS */
 195
 196 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 197 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 198                                         unsigned long len, unsigned long pgoff,
 199                                         unsigned long flags);
 200 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 201
 202 #endif /* _LINUX_HUGETLB_H */