first commit

1 files changed, 405 insertions, 0 deletions

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
new file mode 100644
index 000000000..c8958f563
--- /dev/null
+++ b/include/linux/hugetlb.h
@@ -0,0 +1,405 @@
+#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);
+int PageHeadHuge(struct page *page_head);
+
+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);
+int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
+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);
+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);
+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 int PageHuge(struct page *page)
+{
+	return 0;
+}
+
+static inline int PageHeadHuge(struct page *page_head)
+{
+	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
+static inline void hugetlb_show_meminfo(void)
+{
+}
+#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)
+{
+}
+
+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 */
+
+#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);
+
+/* 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(1 << 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 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;
+}
+
+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);
+}
+
+#else	/* CONFIG_HUGETLB_PAGE */
+struct hstate {};
+#define alloc_huge_page_node(h, nid) 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 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;
+}
+#endif	/* CONFIG_HUGETLB_PAGE */
+
+#endif /* _LINUX_HUGETLB_H */