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-rw-r--r--include/linux/hugetlb.h520
1 files changed, 520 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
new file mode 100644
index 000000000..205026175
--- /dev/null
+++ b/include/linux/hugetlb.h
@@ -0,0 +1,520 @@
+#ifndef _LINUX_HUGETLB_H
+#define _LINUX_HUGETLB_H
+
+#include <linux/mm_types.h>
+#include <linux/mmdebug.h>
+#include <linux/fs.h>
+#include <linux/hugetlb_inline.h>
+#include <linux/cgroup.h>
+#include <linux/list.h>
+#include <linux/kref.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; /* Maximum huge pages or -1 if no maximum. */
+ long used_hpages; /* Used count against maximum, includes */
+ /* both alloced and reserved pages. */
+ struct hstate *hstate;
+ long min_hpages; /* Minimum huge pages or -1 if no minimum. */
+ long rsv_hpages; /* Pages reserved against global pool to */
+ /* sasitfy minimum size. */
+};
+
+struct resv_map {
+ struct kref refs;
+ spinlock_t lock;
+ struct list_head regions;
+};
+extern struct resv_map *resv_map_alloc(void);
+void resv_map_release(struct kref *ref);
+
+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(struct hstate *h, long max_hpages,
+ long min_hpages);
+void hugepage_put_subpool(struct hugepage_subpool *spool);
+
+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 *);
+long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
+ struct page **, struct vm_area_struct **,
+ unsigned long *, unsigned long *, long, unsigned int);
+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);
+void hugetlb_report_meminfo(struct seq_file *);
+int hugetlb_report_node_meminfo(int, char *);
+void hugetlb_show_meminfo(void);
+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);
+bool isolate_huge_page(struct page *page, struct list_head *list);
+void putback_active_hugepage(struct page *page);
+void free_huge_page(struct page *page);
+
+#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
+pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
+#endif
+
+extern int hugepages_treat_as_movable;
+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 flags);
+struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
+ pud_t *pud, int flags);
+int pmd_huge(pmd_t pmd);
+int pud_huge(pud_t pmd);
+unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
+ unsigned long address, unsigned long end, pgprot_t newprot);
+
+#else /* !CONFIG_HUGETLB_PAGE */
+
+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; })
+static inline void hugetlb_report_meminfo(struct seq_file *m)
+{
+}
+#define hugetlb_report_node_meminfo(n, buf) 0
+static inline void hugetlb_show_meminfo(void)
+{
+}
+#define follow_huge_pmd(mm, addr, pmd, flags) NULL
+#define follow_huge_pud(mm, addr, pud, flags) 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 bool isolate_huge_page(struct page *page, struct list_head *list)
+{
+ return false;
+}
+#define putback_active_hugepage(p) do {} while (0)
+
+static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
+ unsigned long address, unsigned long end, pgprot_t newprot)
+{
+ return 0;
+}
+
+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 */
+/*
+ * hugepages at page global directory. If arch support
+ * hugepages at pgd level, they need to define this.
+ */
+#ifndef pgd_huge
+#define pgd_huge(x) 0
+#endif
+
+#ifndef pgd_write
+static inline int pgd_write(pgd_t pgd)
+{
+ BUG();
+ return 0;
+}
+#endif
+
+#ifndef pud_write
+static inline int pud_write(pud_t pud)
+{
+ BUG();
+ return 0;
+}
+#endif
+
+#ifndef is_hugepd
+/*
+ * Some architectures requires a hugepage directory format that is
+ * required to support multiple hugepage sizes. For example
+ * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
+ * introduced the same on powerpc. This allows for a more flexible hugepage
+ * pagetable layout.
+ */
+typedef struct { unsigned long pd; } hugepd_t;
+#define is_hugepd(hugepd) (0)
+#define __hugepd(x) ((hugepd_t) { (x) })
+static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
+ unsigned pdshift, unsigned long end,
+ int write, struct page **pages, int *nr)
+{
+ return 0;
+}
+#else
+extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
+ unsigned pdshift, unsigned long end,
+ int write, struct page **pages, int *nr);
+#endif
+
+#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, size_t size, vm_flags_t acct,
+ struct user_struct **user, int creat_flags,
+ int page_size_log);
+
+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, size_t size, vm_flags_t acctflag,
+ struct user_struct **user, int creat_flags,
+ int page_size_log)
+{
+ 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);
+struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
+ unsigned long addr, int avoid_reserve);
+
+/* 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(file_inode(f));
+}
+
+static inline struct hstate *hstate_sizelog(int page_size_log)
+{
+ if (!page_size_log)
+ return &default_hstate;
+
+ return size_to_hstate(1UL << page_size_log);
+}
+
+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 bool hstate_is_gigantic(struct hstate *h)
+{
+ return huge_page_order(h) >= MAX_ORDER;
+}
+
+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)
+{
+ VM_BUG_ON_PAGE(!PageHuge(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;
+}
+
+pgoff_t __basepage_index(struct page *page);
+
+/* Return page->index in PAGE_SIZE units */
+static inline pgoff_t basepage_index(struct page *page)
+{
+ if (!PageCompound(page))
+ return page->index;
+
+ return __basepage_index(page);
+}
+
+extern void dissolve_free_huge_pages(unsigned long start_pfn,
+ unsigned long end_pfn);
+static inline int hugepage_migration_supported(struct hstate *h)
+{
+#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
+ return huge_page_shift(h) == PMD_SHIFT;
+#else
+ return 0;
+#endif
+}
+
+static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
+ struct mm_struct *mm, pte_t *pte)
+{
+ if (huge_page_size(h) == PMD_SIZE)
+ return pmd_lockptr(mm, (pmd_t *) pte);
+ VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
+ return &mm->page_table_lock;
+}
+
+static inline bool hugepages_supported(void)
+{
+ /*
+ * Some platform decide whether they support huge pages at boot
+ * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
+ * there is no such support
+ */
+ return HPAGE_SHIFT != 0;
+}
+
+#else /* CONFIG_HUGETLB_PAGE */
+struct hstate {};
+#define alloc_huge_page_node(h, nid) NULL
+#define alloc_huge_page_noerr(v, a, r) NULL
+#define alloc_bootmem_huge_page(h) NULL
+#define hstate_file(f) NULL
+#define hstate_sizelog(s) NULL
+#define hstate_vma(v) NULL
+#define hstate_inode(i) NULL
+#define page_hstate(page) 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
+
+static inline pgoff_t basepage_index(struct page *page)
+{
+ return page->index;
+}
+#define dissolve_free_huge_pages(s, e) do {} while (0)
+#define hugepage_migration_supported(h) 0
+
+static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
+ struct mm_struct *mm, pte_t *pte)
+{
+ return &mm->page_table_lock;
+}
+#endif /* CONFIG_HUGETLB_PAGE */
+
+static inline spinlock_t *huge_pte_lock(struct hstate *h,
+ struct mm_struct *mm, pte_t *pte)
+{
+ spinlock_t *ptl;
+
+ ptl = huge_pte_lockptr(h, mm, pte);
+ spin_lock(ptl);
+ return ptl;
+}
+
+#endif /* _LINUX_HUGETLB_H */