LXR linux/include/linux/hugetlb.h

   1#ifndef _LINUX_HUGETLB_H
   2#define _LINUX_HUGETLB_H
   3
   4#include <linux/fs.h>
   5
   6struct ctl_table;
   7struct user_struct;
   8
   9#ifdef CONFIG_HUGETLB_PAGE
  10
  11#include <linux/mempolicy.h>
  12#include <linux/shm.h>
  13#include <asm/tlbflush.h>
  14
  15int PageHuge(struct page *page);
  16
  17static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  18{
  19        return vma->vm_flags & VM_HUGETLB;
  20}
  21
  22void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  23int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  24int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  25int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  26
  27#ifdef CONFIG_NUMA
  28int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  29                                        void __user *, size_t *, loff_t *);
  30#endif
  31
  32int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  33int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  34                        struct page **, struct vm_area_struct **,
  35                        unsigned long *, int *, int, unsigned int flags);
  36void unmap_hugepage_range(struct vm_area_struct *,
  37                        unsigned long, unsigned long, struct page *);
  38void __unmap_hugepage_range(struct vm_area_struct *,
  39                        unsigned long, unsigned long, struct page *);
  40int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  41void hugetlb_report_meminfo(struct seq_file *);
  42int hugetlb_report_node_meminfo(int, char *);
  43unsigned long hugetlb_total_pages(void);
  44int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  45                        unsigned long address, unsigned int flags);
  46int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  47                                                struct vm_area_struct *vma,
  48                                                int acctflags);
  49void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  50
  51extern unsigned long hugepages_treat_as_movable;
  52extern const unsigned long hugetlb_zero, hugetlb_infinity;
  53extern int sysctl_hugetlb_shm_group;
  54extern struct list_head huge_boot_pages;
  55
  56/* arch callbacks */
  57
  58pte_t *huge_pte_alloc(struct mm_struct *mm,
  59                        unsigned long addr, unsigned long sz);
  60pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  61int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  62struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  63                              int write);
  64struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  65                                pmd_t *pmd, int write);
  66struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  67                                pud_t *pud, int write);
  68int pmd_huge(pmd_t pmd);
  69int pud_huge(pud_t pmd);
  70void hugetlb_change_protection(struct vm_area_struct *vma,
  71                unsigned long address, unsigned long end, pgprot_t newprot);
  72
  73#else /* !CONFIG_HUGETLB_PAGE */
  74
  75static inline int PageHuge(struct page *page)
  76{
  77        return 0;
  78}
  79
  80static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  81{
  82        return 0;
  83}
  84
  85static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  86{
  87}
  88
  89static inline unsigned long hugetlb_total_pages(void)
  90{
  91        return 0;
  92}
  93
  94#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  95#define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  96#define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  97#define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  98#define unmap_hugepage_range(vma, start, end, page)     BUG()
  99static inline void hugetlb_report_meminfo(struct seq_file *m)
 100{
 101}
 102#define hugetlb_report_node_meminfo(n, buf)     0
 103#define follow_huge_pmd(mm, addr, pmd, write)   NULL
 104#define follow_huge_pud(mm, addr, pud, write)   NULL
 105#define prepare_hugepage_range(file, addr, len) (-EINVAL)
 106#define pmd_huge(x)     0
 107#define pud_huge(x)     0
 108#define is_hugepage_only_range(mm, addr, len)   0
 109#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 110#define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 111
 112#define hugetlb_change_protection(vma, address, end, newprot)
 113
 114#ifndef HPAGE_MASK
 115#define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 116#define HPAGE_SIZE      PAGE_SIZE
 117#endif
 118
 119#endif /* !CONFIG_HUGETLB_PAGE */
 120
 121#define HUGETLB_ANON_FILE "anon_hugepage"
 122
 123enum {
 124        /*
 125         * The file will be used as an shm file so shmfs accounting rules
 126         * apply
 127         */
 128        HUGETLB_SHMFS_INODE     = 1,
 129        /*
 130         * The file is being created on the internal vfs mount and shmfs
 131         * accounting rules do not apply
 132         */
 133        HUGETLB_ANONHUGE_INODE  = 2,
 134};
 135
 136#ifdef CONFIG_HUGETLBFS
 137struct hugetlbfs_config {
 138        uid_t   uid;
 139        gid_t   gid;
 140        umode_t mode;
 141        long    nr_blocks;
 142        long    nr_inodes;
 143        struct hstate *hstate;
 144};
 145
 146struct hugetlbfs_sb_info {
 147        long    max_blocks;   /* blocks allowed */
 148        long    free_blocks;  /* blocks free */
 149        long    max_inodes;   /* inodes allowed */
 150        long    free_inodes;  /* inodes free */
 151        spinlock_t      stat_lock;
 152        struct hstate *hstate;
 153};
 154
 155
 156struct hugetlbfs_inode_info {
 157        struct shared_policy policy;
 158        struct inode vfs_inode;
 159};
 160
 161static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 162{
 163        return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 164}
 165
 166static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 167{
 168        return sb->s_fs_info;
 169}
 170
 171extern const struct file_operations hugetlbfs_file_operations;
 172extern const struct vm_operations_struct hugetlb_vm_ops;
 173struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
 174                                struct user_struct **user, int creat_flags);
 175int hugetlb_get_quota(struct address_space *mapping, long delta);
 176void hugetlb_put_quota(struct address_space *mapping, long delta);
 177
 178static inline int is_file_hugepages(struct file *file)
 179{
 180        if (file->f_op == &hugetlbfs_file_operations)
 181                return 1;
 182        if (is_file_shm_hugepages(file))
 183                return 1;
 184
 185        return 0;
 186}
 187
 188static inline void set_file_hugepages(struct file *file)
 189{
 190        file->f_op = &hugetlbfs_file_operations;
 191}
 192#else /* !CONFIG_HUGETLBFS */
 193
 194#define is_file_hugepages(file)                 0
 195#define set_file_hugepages(file)                BUG()
 196static inline struct file *hugetlb_file_setup(const char *name, size_t size,
 197                int acctflag, struct user_struct **user, int creat_flags)
 198{
 199        return ERR_PTR(-ENOSYS);
 200}
 201
 202#endif /* !CONFIG_HUGETLBFS */
 203
 204#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 205unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 206                                        unsigned long len, unsigned long pgoff,
 207                                        unsigned long flags);
 208#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 209
 210#ifdef CONFIG_HUGETLB_PAGE
 211
 212#define HSTATE_NAME_LEN 32
 213/* Defines one hugetlb page size */
 214struct hstate {
 215        int next_nid_to_alloc;
 216        int next_nid_to_free;
 217        unsigned int order;
 218        unsigned long mask;
 219        unsigned long max_huge_pages;
 220        unsigned long nr_huge_pages;
 221        unsigned long free_huge_pages;
 222        unsigned long resv_huge_pages;
 223        unsigned long surplus_huge_pages;
 224        unsigned long nr_overcommit_huge_pages;
 225        struct list_head hugepage_freelists[MAX_NUMNODES];
 226        unsigned int nr_huge_pages_node[MAX_NUMNODES];
 227        unsigned int free_huge_pages_node[MAX_NUMNODES];
 228        unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 229        char name[HSTATE_NAME_LEN];
 230};
 231
 232struct huge_bootmem_page {
 233        struct list_head list;
 234        struct hstate *hstate;
 235};
 236
 237/* arch callback */
 238int __init alloc_bootmem_huge_page(struct hstate *h);
 239
 240void __init hugetlb_add_hstate(unsigned order);
 241struct hstate *size_to_hstate(unsigned long size);
 242
 243#ifndef HUGE_MAX_HSTATE
 244#define HUGE_MAX_HSTATE 1
 245#endif
 246
 247extern struct hstate hstates[HUGE_MAX_HSTATE];
 248extern unsigned int default_hstate_idx;
 249
 250#define default_hstate (hstates[default_hstate_idx])
 251
 252static inline struct hstate *hstate_inode(struct inode *i)
 253{
 254        struct hugetlbfs_sb_info *hsb;
 255        hsb = HUGETLBFS_SB(i->i_sb);
 256        return hsb->hstate;
 257}
 258
 259static inline struct hstate *hstate_file(struct file *f)
 260{
 261        return hstate_inode(f->f_dentry->d_inode);
 262}
 263
 264static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 265{
 266        return hstate_file(vma->vm_file);
 267}
 268
 269static inline unsigned long huge_page_size(struct hstate *h)
 270{
 271        return (unsigned long)PAGE_SIZE << h->order;
 272}
 273
 274extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 275
 276extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 277
 278static inline unsigned long huge_page_mask(struct hstate *h)
 279{
 280        return h->mask;
 281}
 282
 283static inline unsigned int huge_page_order(struct hstate *h)
 284{
 285        return h->order;
 286}
 287
 288static inline unsigned huge_page_shift(struct hstate *h)
 289{
 290        return h->order + PAGE_SHIFT;
 291}
 292
 293static inline unsigned int pages_per_huge_page(struct hstate *h)
 294{
 295        return 1 << h->order;
 296}
 297
 298static inline unsigned int blocks_per_huge_page(struct hstate *h)
 299{
 300        return huge_page_size(h) / 512;
 301}
 302
 303#include <asm/hugetlb.h>
 304
 305static inline struct hstate *page_hstate(struct page *page)
 306{
 307        return size_to_hstate(PAGE_SIZE << compound_order(page));
 308}
 309
 310#else
 311struct hstate {};
 312#define alloc_bootmem_huge_page(h) NULL
 313#define hstate_file(f) NULL
 314#define hstate_vma(v) NULL
 315#define hstate_inode(i) NULL
 316#define huge_page_size(h) PAGE_SIZE
 317#define huge_page_mask(h) PAGE_MASK
 318#define vma_kernel_pagesize(v) PAGE_SIZE
 319#define vma_mmu_pagesize(v) PAGE_SIZE
 320#define huge_page_order(h) 0
 321#define huge_page_shift(h) PAGE_SHIFT
 322static inline unsigned int pages_per_huge_page(struct hstate *h)
 323{
 324        return 1;
 325}
 326#endif
 327
 328#endif /* _LINUX_HUGETLB_H */
 329