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 struct user_struct;
  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 void hugetlb_report_meminfo(struct seq_file *);
  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                                                 int acctflags);
  39 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  40
  41 extern unsigned long hugepages_treat_as_movable;
  42 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  43 extern int sysctl_hugetlb_shm_group;
  44 extern struct list_head huge_boot_pages;
  45
  46 /* arch callbacks */
  47
  48 pte_t *huge_pte_alloc(struct mm_struct *mm,
  49                         unsigned long addr, unsigned long sz);
  50 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  51 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  52 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  53                               int write);
  54 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  55                                 pmd_t *pmd, int write);
  56 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  57                                 pud_t *pud, int write);
  58 int pmd_huge(pmd_t pmd);
  59 int pud_huge(pud_t pmd);
  60 void hugetlb_change_protection(struct vm_area_struct *vma,
  61                 unsigned long address, unsigned long end, pgprot_t newprot);
  62
  63 #else /* !CONFIG_HUGETLB_PAGE */
  64
  65 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  66 {
  67         return 0;
  68 }
  69
  70 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  71 {
  72 }
  73
  74 static inline unsigned long hugetlb_total_pages(void)
  75 {
  76         return 0;
  77 }
  78
  79 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  80 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  81 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  82 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  83 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  84 static inline void hugetlb_report_meminfo(struct seq_file *m)
  85 {
  86 }
  87 #define hugetlb_report_node_meminfo(n, buf)     0
  88 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  89 #define follow_huge_pud(mm, addr, pud, write)   NULL
  90 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
  91 #define pmd_huge(x)     0
  92 #define pud_huge(x)     0
  93 #define is_hugepage_only_range(mm, addr, len)   0
  94 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
  95 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
  96
  97 #define hugetlb_change_protection(vma, address, end, newprot)
  98
  99 #ifndef HPAGE_MASK
 100 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 101 #define HPAGE_SIZE      PAGE_SIZE
 102 #endif
 103
 104 #endif /* !CONFIG_HUGETLB_PAGE */
 105
 106 #ifdef CONFIG_HUGETLBFS
 107 struct hugetlbfs_config {
 108         uid_t   uid;
 109         gid_t   gid;
 110         umode_t mode;
 111         long    nr_blocks;
 112         long    nr_inodes;
 113         struct hstate *hstate;
 114 };
 115
 116 struct hugetlbfs_sb_info {
 117         long    max_blocks;   /* blocks allowed */
 118         long    free_blocks;  /* blocks free */
 119         long    max_inodes;   /* inodes allowed */
 120         long    free_inodes;  /* inodes free */
 121         spinlock_t      stat_lock;
 122         struct hstate *hstate;
 123 };
 124
 125
 126 struct hugetlbfs_inode_info {
 127         struct shared_policy policy;
 128         struct inode vfs_inode;
 129 };
 130
 131 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 132 {
 133         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 134 }
 135
 136 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 137 {
 138         return sb->s_fs_info;
 139 }
 140
 141 extern const struct file_operations hugetlbfs_file_operations;
 142 extern struct vm_operations_struct hugetlb_vm_ops;
 143 struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
 144                                                 struct user_struct **user);
 145 int hugetlb_get_quota(struct address_space *mapping, long delta);
 146 void hugetlb_put_quota(struct address_space *mapping, long delta);
 147
 148 static inline int is_file_hugepages(struct file *file)
 149 {
 150         if (file->f_op == &hugetlbfs_file_operations)
 151                 return 1;
 152         if (is_file_shm_hugepages(file))
 153                 return 1;
 154
 155         return 0;
 156 }
 157
 158 static inline void set_file_hugepages(struct file *file)
 159 {
 160         file->f_op = &hugetlbfs_file_operations;
 161 }
 162 #else /* !CONFIG_HUGETLBFS */
 163
 164 #define is_file_hugepages(file)                 0
 165 #define set_file_hugepages(file)                BUG()
 166 #define hugetlb_file_setup(name,size,acct,user) ERR_PTR(-ENOSYS)
 167
 168 #endif /* !CONFIG_HUGETLBFS */
 169
 170 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 171 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 172                                         unsigned long len, unsigned long pgoff,
 173                                         unsigned long flags);
 174 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 175
 176 #ifdef CONFIG_HUGETLB_PAGE
 177
 178 #define HSTATE_NAME_LEN 32
 179 /* Defines one hugetlb page size */
 180 struct hstate {
 181         int hugetlb_next_nid;
 182         unsigned int order;
 183         unsigned long mask;
 184         unsigned long max_huge_pages;
 185         unsigned long nr_huge_pages;
 186         unsigned long free_huge_pages;
 187         unsigned long resv_huge_pages;
 188         unsigned long surplus_huge_pages;
 189         unsigned long nr_overcommit_huge_pages;
 190         struct list_head hugepage_freelists[MAX_NUMNODES];
 191         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 192         unsigned int free_huge_pages_node[MAX_NUMNODES];
 193         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 194         char name[HSTATE_NAME_LEN];
 195 };
 196
 197 struct huge_bootmem_page {
 198         struct list_head list;
 199         struct hstate *hstate;
 200 };
 201
 202 /* arch callback */
 203 int __init alloc_bootmem_huge_page(struct hstate *h);
 204
 205 void __init hugetlb_add_hstate(unsigned order);
 206 struct hstate *size_to_hstate(unsigned long size);
 207
 208 #ifndef HUGE_MAX_HSTATE
 209 #define HUGE_MAX_HSTATE 1
 210 #endif
 211
 212 extern struct hstate hstates[HUGE_MAX_HSTATE];
 213 extern unsigned int default_hstate_idx;
 214
 215 #define default_hstate (hstates[default_hstate_idx])
 216
 217 static inline struct hstate *hstate_inode(struct inode *i)
 218 {
 219         struct hugetlbfs_sb_info *hsb;
 220         hsb = HUGETLBFS_SB(i->i_sb);
 221         return hsb->hstate;
 222 }
 223
 224 static inline struct hstate *hstate_file(struct file *f)
 225 {
 226         return hstate_inode(f->f_dentry->d_inode);
 227 }
 228
 229 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 230 {
 231         return hstate_file(vma->vm_file);
 232 }
 233
 234 static inline unsigned long huge_page_size(struct hstate *h)
 235 {
 236         return (unsigned long)PAGE_SIZE << h->order;
 237 }
 238
 239 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 240
 241 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 242
 243 static inline unsigned long huge_page_mask(struct hstate *h)
 244 {
 245         return h->mask;
 246 }
 247
 248 static inline unsigned int huge_page_order(struct hstate *h)
 249 {
 250         return h->order;
 251 }
 252
 253 static inline unsigned huge_page_shift(struct hstate *h)
 254 {
 255         return h->order + PAGE_SHIFT;
 256 }
 257
 258 static inline unsigned int pages_per_huge_page(struct hstate *h)
 259 {
 260         return 1 << h->order;
 261 }
 262
 263 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 264 {
 265         return huge_page_size(h) / 512;
 266 }
 267
 268 #include <asm/hugetlb.h>
 269
 270 static inline struct hstate *page_hstate(struct page *page)
 271 {
 272         return size_to_hstate(PAGE_SIZE << compound_order(page));
 273 }
 274
 275 #else
 276 struct hstate {};
 277 #define alloc_bootmem_huge_page(h) NULL
 278 #define hstate_file(f) NULL
 279 #define hstate_vma(v) NULL
 280 #define hstate_inode(i) NULL
 281 #define huge_page_size(h) PAGE_SIZE
 282 #define huge_page_mask(h) PAGE_MASK
 283 #define vma_kernel_pagesize(v) PAGE_SIZE
 284 #define vma_mmu_pagesize(v) PAGE_SIZE
 285 #define huge_page_order(h) 0
 286 #define huge_page_shift(h) PAGE_SHIFT
 287 static inline unsigned int pages_per_huge_page(struct hstate *h)
 288 {
 289         return 1;
 290 }
 291 #endif
 292
 293 #endif /* _LINUX_HUGETLB_H */