LXR linux/include/linux/hugetlb.h

   1#ifndef _LINUX_HUGETLB_H
   2#define _LINUX_HUGETLB_H
   3
   4#include <linux/mm_types.h>
   5#include <linux/fs.h>
   6#include <linux/hugetlb_inline.h>
   7
   8struct ctl_table;
   9struct user_struct;
  10
  11#ifdef CONFIG_HUGETLB_PAGE
  12
  13#include <linux/mempolicy.h>
  14#include <linux/shm.h>
  15#include <asm/tlbflush.h>
  16
  17int PageHuge(struct page *page);
  18
  19void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  20int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  21int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  22int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  23
  24#ifdef CONFIG_NUMA
  25int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  26                                        void __user *, size_t *, loff_t *);
  27#endif
  28
  29int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  30int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  31                        struct page **, struct vm_area_struct **,
  32                        unsigned long *, int *, int, unsigned int flags);
  33void unmap_hugepage_range(struct vm_area_struct *,
  34                        unsigned long, unsigned long, struct page *);
  35void __unmap_hugepage_range(struct vm_area_struct *,
  36                        unsigned long, unsigned long, struct page *);
  37int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  38void hugetlb_report_meminfo(struct seq_file *);
  39int hugetlb_report_node_meminfo(int, char *);
  40unsigned long hugetlb_total_pages(void);
  41int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  42                        unsigned long address, unsigned int flags);
  43int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  44                                                struct vm_area_struct *vma,
  45                                                vm_flags_t vm_flags);
  46void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  47int dequeue_hwpoisoned_huge_page(struct page *page);
  48void copy_huge_page(struct page *dst, struct page *src);
  49
  50extern unsigned long hugepages_treat_as_movable;
  51extern const unsigned long hugetlb_zero, hugetlb_infinity;
  52extern int sysctl_hugetlb_shm_group;
  53extern struct list_head huge_boot_pages;
  54
  55/* arch callbacks */
  56
  57pte_t *huge_pte_alloc(struct mm_struct *mm,
  58                        unsigned long addr, unsigned long sz);
  59pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  60int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  61struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  62                              int write);
  63struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  64                                pmd_t *pmd, int write);
  65struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  66                                pud_t *pud, int write);
  67int pmd_huge(pmd_t pmd);
  68int pud_huge(pud_t pmd);
  69void hugetlb_change_protection(struct vm_area_struct *vma,
  70                unsigned long address, unsigned long end, pgprot_t newprot);
  71
  72#else /* !CONFIG_HUGETLB_PAGE */
  73
  74static inline int PageHuge(struct page *page)
  75{
  76        return 0;
  77}
  78
  79static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  80{
  81}
  82
  83static inline unsigned long hugetlb_total_pages(void)
  84{
  85        return 0;
  86}
  87
  88#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  89#define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  90#define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  91#define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  92#define unmap_hugepage_range(vma, start, end, page)     BUG()
  93static inline void hugetlb_report_meminfo(struct seq_file *m)
  94{
  95}
  96#define hugetlb_report_node_meminfo(n, buf)     0
  97#define follow_huge_pmd(mm, addr, pmd, write)   NULL
  98#define follow_huge_pud(mm, addr, pud, write)   NULL
  99#define prepare_hugepage_range(file, addr, len) (-EINVAL)
 100#define pmd_huge(x)     0
 101#define pud_huge(x)     0
 102#define is_hugepage_only_range(mm, addr, len)   0
 103#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 104#define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 105#define huge_pte_offset(mm, address)    0
 106#define dequeue_hwpoisoned_huge_page(page)      0
 107static inline void copy_huge_page(struct page *dst, struct page *src)
 108{
 109}
 110
 111#define hugetlb_change_protection(vma, address, end, newprot)
 112
 113#endif /* !CONFIG_HUGETLB_PAGE */
 114
 115#define HUGETLB_ANON_FILE "anon_hugepage"
 116
 117enum {
 118        /*
 119         * The file will be used as an shm file so shmfs accounting rules
 120         * apply
 121         */
 122        HUGETLB_SHMFS_INODE     = 1,
 123        /*
 124         * The file is being created on the internal vfs mount and shmfs
 125         * accounting rules do not apply
 126         */
 127        HUGETLB_ANONHUGE_INODE  = 2,
 128};
 129
 130#ifdef CONFIG_HUGETLBFS
 131struct hugetlbfs_config {
 132        uid_t   uid;
 133        gid_t   gid;
 134        umode_t mode;
 135        long    nr_blocks;
 136        long    nr_inodes;
 137        struct hstate *hstate;
 138};
 139
 140struct hugetlbfs_sb_info {
 141        long    max_blocks;   /* blocks allowed */
 142        long    free_blocks;  /* blocks free */
 143        long    max_inodes;   /* inodes allowed */
 144        long    free_inodes;  /* inodes free */
 145        spinlock_t      stat_lock;
 146        struct hstate *hstate;
 147};
 148
 149
 150struct hugetlbfs_inode_info {
 151        struct shared_policy policy;
 152        struct inode vfs_inode;
 153};
 154
 155static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 156{
 157        return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 158}
 159
 160static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 161{
 162        return sb->s_fs_info;
 163}
 164
 165extern const struct file_operations hugetlbfs_file_operations;
 166extern const struct vm_operations_struct hugetlb_vm_ops;
 167struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 168                                struct user_struct **user, int creat_flags);
 169int hugetlb_get_quota(struct address_space *mapping, long delta);
 170void hugetlb_put_quota(struct address_space *mapping, long delta);
 171
 172static inline int is_file_hugepages(struct file *file)
 173{
 174        if (file->f_op == &hugetlbfs_file_operations)
 175                return 1;
 176        if (is_file_shm_hugepages(file))
 177                return 1;
 178
 179        return 0;
 180}
 181
 182static inline void set_file_hugepages(struct file *file)
 183{
 184        file->f_op = &hugetlbfs_file_operations;
 185}
 186#else /* !CONFIG_HUGETLBFS */
 187
 188#define is_file_hugepages(file)                 0
 189#define set_file_hugepages(file)                BUG()
 190static inline struct file *hugetlb_file_setup(const char *name, size_t size,
 191                vm_flags_t acctflag, struct user_struct **user, int creat_flags)
 192{
 193        return ERR_PTR(-ENOSYS);
 194}
 195
 196#endif /* !CONFIG_HUGETLBFS */
 197
 198#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 199unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 200                                        unsigned long len, unsigned long pgoff,
 201                                        unsigned long flags);
 202#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 203
 204#ifdef CONFIG_HUGETLB_PAGE
 205
 206#define HSTATE_NAME_LEN 32
 207/* Defines one hugetlb page size */
 208struct hstate {
 209        int next_nid_to_alloc;
 210        int next_nid_to_free;
 211        unsigned int order;
 212        unsigned long mask;
 213        unsigned long max_huge_pages;
 214        unsigned long nr_huge_pages;
 215        unsigned long free_huge_pages;
 216        unsigned long resv_huge_pages;
 217        unsigned long surplus_huge_pages;
 218        unsigned long nr_overcommit_huge_pages;
 219        struct list_head hugepage_freelists[MAX_NUMNODES];
 220        unsigned int nr_huge_pages_node[MAX_NUMNODES];
 221        unsigned int free_huge_pages_node[MAX_NUMNODES];
 222        unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 223        char name[HSTATE_NAME_LEN];
 224};
 225
 226struct huge_bootmem_page {
 227        struct list_head list;
 228        struct hstate *hstate;
 229#ifdef CONFIG_HIGHMEM
 230        phys_addr_t phys;
 231#endif
 232};
 233
 234struct page *alloc_huge_page_node(struct hstate *h, int nid);
 235
 236/* arch callback */
 237int __init alloc_bootmem_huge_page(struct hstate *h);
 238
 239void __init hugetlb_add_hstate(unsigned order);
 240struct hstate *size_to_hstate(unsigned long size);
 241
 242#ifndef HUGE_MAX_HSTATE
 243#define HUGE_MAX_HSTATE 1
 244#endif
 245
 246extern struct hstate hstates[HUGE_MAX_HSTATE];
 247extern unsigned int default_hstate_idx;
 248
 249#define default_hstate (hstates[default_hstate_idx])
 250
 251static inline struct hstate *hstate_inode(struct inode *i)
 252{
 253        struct hugetlbfs_sb_info *hsb;
 254        hsb = HUGETLBFS_SB(i->i_sb);
 255        return hsb->hstate;
 256}
 257
 258static inline struct hstate *hstate_file(struct file *f)
 259{
 260        return hstate_inode(f->f_dentry->d_inode);
 261}
 262
 263static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 264{
 265        return hstate_file(vma->vm_file);
 266}
 267
 268static inline unsigned long huge_page_size(struct hstate *h)
 269{
 270        return (unsigned long)PAGE_SIZE << h->order;
 271}
 272
 273extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 274
 275extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 276
 277static inline unsigned long huge_page_mask(struct hstate *h)
 278{
 279        return h->mask;
 280}
 281
 282static inline unsigned int huge_page_order(struct hstate *h)
 283{
 284        return h->order;
 285}
 286
 287static inline unsigned huge_page_shift(struct hstate *h)
 288{
 289        return h->order + PAGE_SHIFT;
 290}
 291
 292static inline unsigned int pages_per_huge_page(struct hstate *h)
 293{
 294        return 1 << h->order;
 295}
 296
 297static inline unsigned int blocks_per_huge_page(struct hstate *h)
 298{
 299        return huge_page_size(h) / 512;
 300}
 301
 302#include <asm/hugetlb.h>
 303
 304static inline struct hstate *page_hstate(struct page *page)
 305{
 306        return size_to_hstate(PAGE_SIZE << compound_order(page));
 307}
 308
 309static inline unsigned hstate_index_to_shift(unsigned index)
 310{
 311        return hstates[index].order + PAGE_SHIFT;
 312}
 313
 314#else
 315struct hstate {};
 316#define alloc_huge_page_node(h, nid) NULL
 317#define alloc_bootmem_huge_page(h) NULL
 318#define hstate_file(f) NULL
 319#define hstate_vma(v) NULL
 320#define hstate_inode(i) NULL
 321#define huge_page_size(h) PAGE_SIZE
 322#define huge_page_mask(h) PAGE_MASK
 323#define vma_kernel_pagesize(v) PAGE_SIZE
 324#define vma_mmu_pagesize(v) PAGE_SIZE
 325#define huge_page_order(h) 0
 326#define huge_page_shift(h) PAGE_SHIFT
 327static inline unsigned int pages_per_huge_page(struct hstate *h)
 328{
 329        return 1;
 330}
 331#define hstate_index_to_shift(index) 0
 332#endif
 333
 334#endif /* _LINUX_HUGETLB_H */
 335