diff options
Diffstat (limited to 'kernel/include/linux/hugetlb.h')
| -rw-r--r-- | kernel/include/linux/hugetlb.h | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/kernel/include/linux/hugetlb.h b/kernel/include/linux/hugetlb.h new file mode 100644 index 000000000..205026175 --- /dev/null +++ b/kernel/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 */ |