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 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
  25 void unmap_hugepage_range(struct vm_area_struct *,
  26                         unsigned long, unsigned long, struct page *);
  27 void __unmap_hugepage_range(struct vm_area_struct *,
  28                         unsigned long, unsigned long, struct page *);
  29 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  30 int hugetlb_report_meminfo(char *);
  31 int hugetlb_report_node_meminfo(int, char *);
  32 unsigned long hugetlb_total_pages(void);
  33 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  34                         unsigned long address, int write_access);
  35 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  36                                                 struct vm_area_struct *vma);
  37 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  38
  39 extern unsigned long hugepages_treat_as_movable;
  40 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  41 extern int sysctl_hugetlb_shm_group;
  42
  43 /* arch callbacks */
  44
  45 pte_t *huge_pte_alloc(struct mm_struct *mm,
  46                         unsigned long addr, unsigned long sz);
  47 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  48 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  49 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  50                               int write);
  51 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  52                                 pmd_t *pmd, int write);
  53 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  54                                 pud_t *pud, int write);
  55 int pmd_huge(pmd_t pmd);
  56 int pud_huge(pud_t pmd);
  57 void hugetlb_change_protection(struct vm_area_struct *vma,
  58                 unsigned long address, unsigned long end, pgprot_t newprot);
  59
  60 #else /* !CONFIG_HUGETLB_PAGE */
  61
  62 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  63 {
  64         return 0;
  65 }
  66
  67 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  68 {
  69 }
  70
  71 static inline unsigned long hugetlb_total_pages(void)
  72 {
  73         return 0;
  74 }
  75
  76 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  77 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  78 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  79 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  80 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  81 #define hugetlb_report_meminfo(buf)             0
  82 #define hugetlb_report_node_meminfo(n, buf)     0
  83 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  84 #define follow_huge_pud(mm, addr, pud, write)   NULL
  85 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
  86 #define pmd_huge(x)     0
  87 #define pud_huge(x)     0
  88 #define is_hugepage_only_range(mm, addr, len)   0
  89 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
  90 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
  91
  92 #define hugetlb_change_protection(vma, address, end, newprot)
  93
  94 #ifndef HPAGE_MASK
  95 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
  96 #define HPAGE_SIZE      PAGE_SIZE
  97 #endif
  98
  99 #endif /* !CONFIG_HUGETLB_PAGE */
 100
 101 #ifdef CONFIG_HUGETLBFS
 102 struct hugetlbfs_config {
 103         uid_t   uid;
 104         gid_t   gid;
 105         umode_t mode;
 106         long    nr_blocks;
 107         long    nr_inodes;
 108         struct hstate *hstate;
 109 };
 110
 111 struct hugetlbfs_sb_info {
 112         long    max_blocks;   /* blocks allowed */
 113         long    free_blocks;  /* blocks free */
 114         long    max_inodes;   /* inodes allowed */
 115         long    free_inodes;  /* inodes free */
 116         spinlock_t      stat_lock;
 117         struct hstate *hstate;
 118 };
 119
 120
 121 struct hugetlbfs_inode_info {
 122         struct shared_policy policy;
 123         struct inode vfs_inode;
 124 };
 125
 126 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 127 {
 128         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 129 }
 130
 131 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 132 {
 133         return sb->s_fs_info;
 134 }
 135
 136 extern const struct file_operations hugetlbfs_file_operations;
 137 extern struct vm_operations_struct hugetlb_vm_ops;
 138 struct file *hugetlb_file_setup(const char *name, size_t);
 139 int hugetlb_get_quota(struct address_space *mapping, long delta);
 140 void hugetlb_put_quota(struct address_space *mapping, long delta);
 141
 142 static inline int is_file_hugepages(struct file *file)
 143 {
 144         if (file->f_op == &hugetlbfs_file_operations)
 145                 return 1;
 146         if (is_file_shm_hugepages(file))
 147                 return 1;
 148
 149         return 0;
 150 }
 151
 152 static inline void set_file_hugepages(struct file *file)
 153 {
 154         file->f_op = &hugetlbfs_file_operations;
 155 }
 156 #else /* !CONFIG_HUGETLBFS */
 157
 158 #define is_file_hugepages(file)         0
 159 #define set_file_hugepages(file)        BUG()
 160 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 161
 162 #endif /* !CONFIG_HUGETLBFS */
 163
 164 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 165 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 166                                         unsigned long len, unsigned long pgoff,
 167                                         unsigned long flags);
 168 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 169
 170 #ifdef CONFIG_HUGETLB_PAGE
 171
 172 #define HSTATE_NAME_LEN 32
 173 /* Defines one hugetlb page size */
 174 struct hstate {
 175         int hugetlb_next_nid;
 176         unsigned int order;
 177         unsigned long mask;
 178         unsigned long max_huge_pages;
 179         unsigned long nr_huge_pages;
 180         unsigned long free_huge_pages;
 181         unsigned long resv_huge_pages;
 182         unsigned long surplus_huge_pages;
 183         unsigned long nr_overcommit_huge_pages;
 184         struct list_head hugepage_freelists[MAX_NUMNODES];
 185         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 186         unsigned int free_huge_pages_node[MAX_NUMNODES];
 187         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 188         char name[HSTATE_NAME_LEN];
 189 };
 190
 191 void __init hugetlb_add_hstate(unsigned order);
 192 struct hstate *size_to_hstate(unsigned long size);
 193
 194 #ifndef HUGE_MAX_HSTATE
 195 #define HUGE_MAX_HSTATE 1
 196 #endif
 197
 198 extern struct hstate hstates[HUGE_MAX_HSTATE];
 199 extern unsigned int default_hstate_idx;
 200
 201 #define default_hstate (hstates[default_hstate_idx])
 202
 203 static inline struct hstate *hstate_inode(struct inode *i)
 204 {
 205         struct hugetlbfs_sb_info *hsb;
 206         hsb = HUGETLBFS_SB(i->i_sb);
 207         return hsb->hstate;
 208 }
 209
 210 static inline struct hstate *hstate_file(struct file *f)
 211 {
 212         return hstate_inode(f->f_dentry->d_inode);
 213 }
 214
 215 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 216 {
 217         return hstate_file(vma->vm_file);
 218 }
 219
 220 static inline unsigned long huge_page_size(struct hstate *h)
 221 {
 222         return (unsigned long)PAGE_SIZE << h->order;
 223 }
 224
 225 static inline unsigned long huge_page_mask(struct hstate *h)
 226 {
 227         return h->mask;
 228 }
 229
 230 static inline unsigned int huge_page_order(struct hstate *h)
 231 {
 232         return h->order;
 233 }
 234
 235 static inline unsigned huge_page_shift(struct hstate *h)
 236 {
 237         return h->order + PAGE_SHIFT;
 238 }
 239
 240 static inline unsigned int pages_per_huge_page(struct hstate *h)
 241 {
 242         return 1 << h->order;
 243 }
 244
 245 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 246 {
 247         return huge_page_size(h) / 512;
 248 }
 249
 250 #include <asm/hugetlb.h>
 251
 252 static inline struct hstate *page_hstate(struct page *page)
 253 {
 254         return size_to_hstate(PAGE_SIZE << compound_order(page));
 255 }
 256
 257 #else
 258 struct hstate {};
 259 #define hstate_file(f) NULL
 260 #define hstate_vma(v) NULL
 261 #define hstate_inode(i) NULL
 262 #define huge_page_size(h) PAGE_SIZE
 263 #define huge_page_mask(h) PAGE_MASK
 264 #define huge_page_order(h) 0
 265 #define huge_page_shift(h) PAGE_SHIFT
 266 #define pages_per_huge_page(h) 1
 267 #endif
 268
 269 #endif /* _LINUX_HUGETLB_H */