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