1#ifndef _LINUX_HUGETLB_H 2#define _LINUX_HUGETLB_H 3 4#ifdef CONFIG_HUGETLB_PAGE 5 6#include <linux/mempolicy.h> 7#include <linux/shm.h> 8#include <asm/tlbflush.h> 9 10struct ctl_table; 11 12static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 13{ 14 return vma->vm_flags & VM_HUGETLB; 15} 16 17int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 18int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 19int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int); 20void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long); 21void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long); 22int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 23int hugetlb_report_meminfo(char *); 24int hugetlb_report_node_meminfo(int, char *); 25unsigned long hugetlb_total_pages(void); 26int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 27 unsigned long address, int write_access); 28int hugetlb_reserve_pages(struct inode *inode, long from, long to); 29void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 30 31extern unsigned long max_huge_pages; 32extern const unsigned long hugetlb_zero, hugetlb_infinity; 33extern int sysctl_hugetlb_shm_group; 34 35/* arch callbacks */ 36 37pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr); 38pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 39int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 40struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 41 int write); 42struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 43 pmd_t *pmd, int write); 44int pmd_huge(pmd_t pmd); 45void hugetlb_change_protection(struct vm_area_struct *vma, 46 unsigned long address, unsigned long end, pgprot_t newprot); 47 48#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE 49#define is_hugepage_only_range(mm, addr, len) 0 50#endif 51 52#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE 53#define hugetlb_free_pgd_range free_pgd_range 54#else 55void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr, 56 unsigned long end, unsigned long floor, 57 unsigned long ceiling); 58#endif 59 60#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE 61/* 62 * If the arch doesn't supply something else, assume that hugepage 63 * size aligned regions are ok without further preparation. 64 */ 65static inline int prepare_hugepage_range(unsigned long addr, unsigned long len, 66 pgoff_t pgoff) 67{ 68 if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT)) 69 return -EINVAL; 70 if (len & ~HPAGE_MASK) 71 return -EINVAL; 72 if (addr & ~HPAGE_MASK) 73 return -EINVAL; 74 return 0; 75} 76#else 77int prepare_hugepage_range(unsigned long addr, unsigned long len, 78 pgoff_t pgoff); 79#endif 80 81#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE 82#define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte) 83#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep) 84#else 85void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 86 pte_t *ptep, pte_t pte); 87pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 88 pte_t *ptep); 89#endif 90 91#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK 92#define hugetlb_prefault_arch_hook(mm) do { } while (0) 93#else 94void hugetlb_prefault_arch_hook(struct mm_struct *mm); 95#endif 96 97#else /* !CONFIG_HUGETLB_PAGE */ 98 99static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 100{ 101 return 0; 102} 103static inline unsigned long hugetlb_total_pages(void) 104{ 105 return 0; 106} 107 108#define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; }) 109#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 110#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 111#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 112#define unmap_hugepage_range(vma, start, end) BUG() 113#define hugetlb_report_meminfo(buf) 0 114#define hugetlb_report_node_meminfo(n, buf) 0 115#define follow_huge_pmd(mm, addr, pmd, write) NULL 116#define prepare_hugepage_range(addr,len,pgoff) (-EINVAL) 117#define pmd_huge(x) 0 118#define is_hugepage_only_range(mm, addr, len) 0 119#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 120#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; }) 121 122#define hugetlb_change_protection(vma, address, end, newprot) 123 124#ifndef HPAGE_MASK 125#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */ 126#define HPAGE_SIZE PAGE_SIZE 127#endif 128 129#endif /* !CONFIG_HUGETLB_PAGE */ 130 131#ifdef CONFIG_HUGETLBFS 132struct hugetlbfs_config { 133 uid_t uid; 134 gid_t gid; 135 umode_t mode; 136 long nr_blocks; 137 long nr_inodes; 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}; 147 148 149struct hugetlbfs_inode_info { 150 struct shared_policy policy; 151 struct inode vfs_inode; 152}; 153 154static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 155{ 156 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 157} 158 159static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 160{ 161 return sb->s_fs_info; 162} 163 164extern const struct file_operations hugetlbfs_file_operations; 165extern struct vm_operations_struct hugetlb_vm_ops; 166struct file *hugetlb_file_setup(const char *name, size_t); 167int hugetlb_get_quota(struct address_space *mapping); 168void hugetlb_put_quota(struct address_space *mapping); 169 170static inline int is_file_hugepages(struct file *file) 171{ 172 if (file->f_op == &hugetlbfs_file_operations) 173 return 1; 174 if (is_file_shm_hugepages(file)) 175 return 1; 176 177 return 0; 178} 179 180static inline void set_file_hugepages(struct file *file) 181{ 182 file->f_op = &hugetlbfs_file_operations; 183} 184#else /* !CONFIG_HUGETLBFS */ 185 186#define is_file_hugepages(file) 0 187#define set_file_hugepages(file) BUG() 188#define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS) 189 190#endif /* !CONFIG_HUGETLBFS */ 191 192#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 193unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 194 unsigned long len, unsigned long pgoff, 195 unsigned long flags); 196#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 197 198#endif /* _LINUX_HUGETLB_H */ 199