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