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 int PageHuge(struct page *page);
  15
  16 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  17 {
  18         return vma->vm_flags & VM_HUGETLB;
  19 }
  20
  21 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  22 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  23 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  24 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  25 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  26 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
  27 void unmap_hugepage_range(struct vm_area_struct *,
  28                         unsigned long, unsigned long, struct page *);
  29 void __unmap_hugepage_range(struct vm_area_struct *,
  30                         unsigned long, unsigned long, struct page *);
  31 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  32 void hugetlb_report_meminfo(struct seq_file *);
  33 int hugetlb_report_node_meminfo(int, char *);
  34 unsigned long hugetlb_total_pages(void);
  35 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  36                         unsigned long address, unsigned int flags);
  37 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  38                                                 struct vm_area_struct *vma,
  39                                                 int acctflags);
  40 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  41
  42 extern unsigned long hugepages_treat_as_movable;
  43 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  44 extern int sysctl_hugetlb_shm_group;
  45 extern struct list_head huge_boot_pages;
  46
  47 /* arch callbacks */
  48
  49 pte_t *huge_pte_alloc(struct mm_struct *mm,
  50                         unsigned long addr, unsigned long sz);
  51 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  52 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  53 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  54                               int write);
  55 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  56                                 pmd_t *pmd, int write);
  57 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  58                                 pud_t *pud, int write);
  59 int pmd_huge(pmd_t pmd);
  60 int pud_huge(pud_t pmd);
  61 void hugetlb_change_protection(struct vm_area_struct *vma,
  62                 unsigned long address, unsigned long end, pgprot_t newprot);
  63
  64 #else /* !CONFIG_HUGETLB_PAGE */
  65
  66 static inline int PageHuge(struct page *page)
  67 {
  68         return 0;
  69 }
  70
  71 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  72 {
  73         return 0;
  74 }
  75
  76 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  77 {
  78 }
  79
  80 static inline unsigned long hugetlb_total_pages(void)
  81 {
  82         return 0;
  83 }
  84
  85 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  86 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  87 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  88 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  89 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  90 static inline void hugetlb_report_meminfo(struct seq_file *m)
  91 {
  92 }
  93 #define hugetlb_report_node_meminfo(n, buf)     0
  94 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  95 #define follow_huge_pud(mm, addr, pud, write)   NULL
  96 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
  97 #define pmd_huge(x)     0
  98 #define pud_huge(x)     0
  99 #define is_hugepage_only_range(mm, addr, len)   0
 100 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 101 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 102
 103 #define hugetlb_change_protection(vma, address, end, newprot)
 104
 105 #ifndef HPAGE_MASK
 106 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 107 #define HPAGE_SIZE      PAGE_SIZE
 108 #endif
 109
 110 #endif /* !CONFIG_HUGETLB_PAGE */
 111
 112 #ifdef CONFIG_HUGETLBFS
 113 struct hugetlbfs_config {
 114         uid_t   uid;
 115         gid_t   gid;
 116         umode_t mode;
 117         long    nr_blocks;
 118         long    nr_inodes;
 119         struct hstate *hstate;
 120 };
 121
 122 struct hugetlbfs_sb_info {
 123         long    max_blocks;   /* blocks allowed */
 124         long    free_blocks;  /* blocks free */
 125         long    max_inodes;   /* inodes allowed */
 126         long    free_inodes;  /* inodes free */
 127         spinlock_t      stat_lock;
 128         struct hstate *hstate;
 129 };
 130
 131
 132 struct hugetlbfs_inode_info {
 133         struct shared_policy policy;
 134         struct inode vfs_inode;
 135 };
 136
 137 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 138 {
 139         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 140 }
 141
 142 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 143 {
 144         return sb->s_fs_info;
 145 }
 146
 147 extern const struct file_operations hugetlbfs_file_operations;
 148 extern struct vm_operations_struct hugetlb_vm_ops;
 149 struct file *hugetlb_file_setup(const char *name, size_t, int);
 150 int hugetlb_get_quota(struct address_space *mapping, long delta);
 151 void hugetlb_put_quota(struct address_space *mapping, long delta);
 152
 153 static inline int is_file_hugepages(struct file *file)
 154 {
 155         if (file->f_op == &hugetlbfs_file_operations)
 156                 return 1;
 157         if (is_file_shm_hugepages(file))
 158                 return 1;
 159
 160         return 0;
 161 }
 162
 163 static inline void set_file_hugepages(struct file *file)
 164 {
 165         file->f_op = &hugetlbfs_file_operations;
 166 }
 167 #else /* !CONFIG_HUGETLBFS */
 168
 169 #define is_file_hugepages(file)                 0
 170 #define set_file_hugepages(file)                BUG()
 171 #define hugetlb_file_setup(name,size,acctflag)  ERR_PTR(-ENOSYS)
 172
 173 #endif /* !CONFIG_HUGETLBFS */
 174
 175 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 176 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 177                                         unsigned long len, unsigned long pgoff,
 178                                         unsigned long flags);
 179 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 180
 181 #ifdef CONFIG_HUGETLB_PAGE
 182
 183 #define HSTATE_NAME_LEN 32
 184 /* Defines one hugetlb page size */
 185 struct hstate {
 186         int hugetlb_next_nid;
 187         unsigned int order;
 188         unsigned long mask;
 189         unsigned long max_huge_pages;
 190         unsigned long nr_huge_pages;
 191         unsigned long free_huge_pages;
 192         unsigned long resv_huge_pages;
 193         unsigned long surplus_huge_pages;
 194         unsigned long nr_overcommit_huge_pages;
 195         struct list_head hugepage_freelists[MAX_NUMNODES];
 196         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 197         unsigned int free_huge_pages_node[MAX_NUMNODES];
 198         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 199         char name[HSTATE_NAME_LEN];
 200 };
 201
 202 struct huge_bootmem_page {
 203         struct list_head list;
 204         struct hstate *hstate;
 205 };
 206
 207 /* arch callback */
 208 int __init alloc_bootmem_huge_page(struct hstate *h);
 209
 210 void __init hugetlb_add_hstate(unsigned order);
 211 struct hstate *size_to_hstate(unsigned long size);
 212
 213 #ifndef HUGE_MAX_HSTATE
 214 #define HUGE_MAX_HSTATE 1
 215 #endif
 216
 217 extern struct hstate hstates[HUGE_MAX_HSTATE];
 218 extern unsigned int default_hstate_idx;
 219
 220 #define default_hstate (hstates[default_hstate_idx])
 221
 222 static inline struct hstate *hstate_inode(struct inode *i)
 223 {
 224         struct hugetlbfs_sb_info *hsb;
 225         hsb = HUGETLBFS_SB(i->i_sb);
 226         return hsb->hstate;
 227 }
 228
 229 static inline struct hstate *hstate_file(struct file *f)
 230 {
 231         return hstate_inode(f->f_dentry->d_inode);
 232 }
 233
 234 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 235 {
 236         return hstate_file(vma->vm_file);
 237 }
 238
 239 static inline unsigned long huge_page_size(struct hstate *h)
 240 {
 241         return (unsigned long)PAGE_SIZE << h->order;
 242 }
 243
 244 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 245
 246 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 247
 248 static inline unsigned long huge_page_mask(struct hstate *h)
 249 {
 250         return h->mask;
 251 }
 252
 253 static inline unsigned int huge_page_order(struct hstate *h)
 254 {
 255         return h->order;
 256 }
 257
 258 static inline unsigned huge_page_shift(struct hstate *h)
 259 {
 260         return h->order + PAGE_SHIFT;
 261 }
 262
 263 static inline unsigned int pages_per_huge_page(struct hstate *h)
 264 {
 265         return 1 << h->order;
 266 }
 267
 268 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 269 {
 270         return huge_page_size(h) / 512;
 271 }
 272
 273 #include <asm/hugetlb.h>
 274
 275 static inline struct hstate *page_hstate(struct page *page)
 276 {
 277         return size_to_hstate(PAGE_SIZE << compound_order(page));
 278 }
 279
 280 #else
 281 struct hstate {};
 282 #define alloc_bootmem_huge_page(h) NULL
 283 #define hstate_file(f) NULL
 284 #define hstate_vma(v) NULL
 285 #define hstate_inode(i) NULL
 286 #define huge_page_size(h) PAGE_SIZE
 287 #define huge_page_mask(h) PAGE_MASK
 288 #define vma_kernel_pagesize(v) PAGE_SIZE
 289 #define vma_mmu_pagesize(v) PAGE_SIZE
 290 #define huge_page_order(h) 0
 291 #define huge_page_shift(h) PAGE_SHIFT
 292 static inline unsigned int pages_per_huge_page(struct hstate *h)
 293 {
 294         return 1;
 295 }
 296 #endif
 297
 298 #endif /* _LINUX_HUGETLB_H */