hugetlb.h

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#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/mm_types.h>
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>
#include <linux/cgroup.h>

struct ctl_table;
struct user_struct;
struct mmu_gather;

#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
#include <linux/shm.h>
#include <asm/tlbflush.h>

struct hugepage_subpool {
    spinlock_t lock;
    long count;
    long max_hpages, used_hpages;
};

extern spinlock_t hugetlb_lock;
extern int hugetlb_max_hstate __read_mostly;
#define for_each_hstate(h) \
    for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)

struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
void hugepage_put_subpool(struct hugepage_subpool *spool);

int PageHuge(struct page *page);

void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);

#ifdef CONFIG_NUMA
int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
                    void __user *, size_t *, loff_t *);
#endif

int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
            struct page **, struct vm_area_struct **,
            unsigned long *, int *, int, unsigned int flags);
void unmap_hugepage_range(struct vm_area_struct *,
              unsigned long, unsigned long, struct page *);
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
              struct vm_area_struct *vma,
              unsigned long start, unsigned long end,
              struct page *ref_page);
void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
                unsigned long start, unsigned long end,
                struct page *ref_page);
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
void hugetlb_report_meminfo(struct seq_file *);
int hugetlb_report_node_meminfo(int, char *);
unsigned long hugetlb_total_pages(void);
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
            unsigned long address, unsigned int flags);
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
                        struct vm_area_struct *vma,
                        vm_flags_t vm_flags);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
int dequeue_hwpoisoned_huge_page(struct page *page);
void copy_huge_page(struct page *dst, struct page *src);

extern unsigned long hugepages_treat_as_movable;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
extern struct list_head huge_boot_pages;

/* arch callbacks */

pte_t *huge_pte_alloc(struct mm_struct *mm,
            unsigned long addr, unsigned long sz);
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
                  int write);
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
                pmd_t *pmd, int write);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
                pud_t *pud, int write);
int pmd_huge(pmd_t pmd);
int pud_huge(pud_t pmd);
void hugetlb_change_protection(struct vm_area_struct *vma,
        unsigned long address, unsigned long end, pgprot_t newprot);

#else /* !CONFIG_HUGETLB_PAGE */

static inline int PageHuge(struct page *page)
{
    return 0;
}

static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

static inline unsigned long hugetlb_total_pages(void)
{
    return 0;
}

#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
#define follow_huge_addr(mm, addr, write)   ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
#define hugetlb_prefault(mapping, vma)      ({ BUG(); 0; })
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
#define hugetlb_report_node_meminfo(n, buf) 0
#define follow_huge_pmd(mm, addr, pmd, write)   NULL
#define follow_huge_pud(mm, addr, pud, write)   NULL
#define prepare_hugepage_range(file, addr, len) (-EINVAL)
#define pmd_huge(x) 0
#define pud_huge(x) 0
#define is_hugepage_only_range(mm, addr, len)   0
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
#define huge_pte_offset(mm, address)    0
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
    return 0;
}

static inline void copy_huge_page(struct page *dst, struct page *src)
{
}

#define hugetlb_change_protection(vma, address, end, newprot)

static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
            struct vm_area_struct *vma, unsigned long start,
            unsigned long end, struct page *ref_page)
{
    BUG();
}

static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
            struct vm_area_struct *vma, unsigned long start,
            unsigned long end, struct page *ref_page)
{
    BUG();
}

#endif /* !CONFIG_HUGETLB_PAGE */

#define HUGETLB_ANON_FILE "anon_hugepage"

enum {
    /*
     * The file will be used as an shm file so shmfs accounting rules
     * apply
     */
    HUGETLB_SHMFS_INODE     = 1,
    /*
     * The file is being created on the internal vfs mount and shmfs
     * accounting rules do not apply
     */
    HUGETLB_ANONHUGE_INODE  = 2,
};

#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
    long    max_inodes;   /* inodes allowed */
    long    free_inodes;  /* inodes free */
    spinlock_t  stat_lock;
    struct hstate *hstate;
    struct hugepage_subpool *spool;
};

static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
{
    return sb->s_fs_info;
}

extern const struct file_operations hugetlbfs_file_operations;
extern const struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, unsigned long addr,
                size_t size, vm_flags_t acct,
                struct user_struct **user, int creat_flags);

static inline int is_file_hugepages(struct file *file)
{
    if (file->f_op == &hugetlbfs_file_operations)
        return 1;
    if (is_file_shm_hugepages(file))
        return 1;

    return 0;
}

#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)         0
static inline struct file *
hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
        vm_flags_t acctflag, struct user_struct **user, int creat_flags)
{
    return ERR_PTR(-ENOSYS);
}

#endif /* !CONFIG_HUGETLBFS */

#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
                    unsigned long len, unsigned long pgoff,
                    unsigned long flags);
#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */

#ifdef CONFIG_HUGETLB_PAGE

#define HSTATE_NAME_LEN 32
/* Defines one hugetlb page size */
struct hstate {
    int next_nid_to_alloc;
    int next_nid_to_free;
    unsigned int order;
    unsigned long mask;
    unsigned long max_huge_pages;
    unsigned long nr_huge_pages;
    unsigned long free_huge_pages;
    unsigned long resv_huge_pages;
    unsigned long surplus_huge_pages;
    unsigned long nr_overcommit_huge_pages;
    struct list_head hugepage_activelist;
    struct list_head hugepage_freelists[MAX_NUMNODES];
    unsigned int nr_huge_pages_node[MAX_NUMNODES];
    unsigned int free_huge_pages_node[MAX_NUMNODES];
    unsigned int surplus_huge_pages_node[MAX_NUMNODES];
#ifdef CONFIG_CGROUP_HUGETLB
    /* cgroup control files */
    struct cftype cgroup_files[5];
#endif
    char name[HSTATE_NAME_LEN];
};

struct huge_bootmem_page {
    struct list_head list;
    struct hstate *hstate;
#ifdef CONFIG_HIGHMEM
    phys_addr_t phys;
#endif
};

struct page *alloc_huge_page_node(struct hstate *h, int nid);

/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

void __init hugetlb_add_hstate(unsigned order);
struct hstate *size_to_hstate(unsigned long size);

#ifndef HUGE_MAX_HSTATE
#define HUGE_MAX_HSTATE 1
#endif

extern struct hstate hstates[HUGE_MAX_HSTATE];
extern unsigned int default_hstate_idx;

#define default_hstate (hstates[default_hstate_idx])

static inline struct hstate *hstate_inode(struct inode *i)
{
    struct hugetlbfs_sb_info *hsb;
    hsb = HUGETLBFS_SB(i->i_sb);
    return hsb->hstate;
}

static inline struct hstate *hstate_file(struct file *f)
{
    return hstate_inode(f->f_dentry->d_inode);
}

static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
{
    return hstate_file(vma->vm_file);
}

static inline unsigned long huge_page_size(struct hstate *h)
{
    return (unsigned long)PAGE_SIZE << h->order;
}

extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

static inline unsigned long huge_page_mask(struct hstate *h)
{
    return h->mask;
}

static inline unsigned int huge_page_order(struct hstate *h)
{
    return h->order;
}

static inline unsigned huge_page_shift(struct hstate *h)
{
    return h->order + PAGE_SHIFT;
}

static inline unsigned int pages_per_huge_page(struct hstate *h)
{
    return 1 << h->order;
}

static inline unsigned int blocks_per_huge_page(struct hstate *h)
{
    return huge_page_size(h) / 512;
}

#include <asm/hugetlb.h>

#ifndef arch_make_huge_pte
static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
                       struct page *page, int writable)
{
    return entry;
}
#endif

static inline struct hstate *page_hstate(struct page *page)
{
    return size_to_hstate(PAGE_SIZE << compound_order(page));
}

static inline unsigned hstate_index_to_shift(unsigned index)
{
    return hstates[index].order + PAGE_SHIFT;
}

static inline int hstate_index(struct hstate *h)
{
    return h - hstates;
}

#else
struct hstate {};
#define alloc_huge_page_node(h, nid) NULL
#define alloc_bootmem_huge_page(h) NULL
#define hstate_file(f) NULL
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
#define vma_kernel_pagesize(v) PAGE_SIZE
#define vma_mmu_pagesize(v) PAGE_SIZE
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
    return 1;
}
#define hstate_index_to_shift(index) 0
#define hstate_index(h) 0
#endif

#endif /* _LINUX_HUGETLB_H */