1 #ifndef _LINUX_HUGETLB_H 2 #define _LINUX_HUGETLB_H 3 4 #include <linux/fs.h> 5 6 #ifdef CONFIG_HUGETLB_PAGE 7 8 #include <linux/mempolicy.h> 9 #include <linux/shm.h> 10 #include <asm/tlbflush.h> 11 12 struct ctl_table; 13 14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 15 { 16 return vma->vm_flags & VM_HUGETLB; 17 } 18 19 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 20 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 21 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 22 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int); 23 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long); 24 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long); 25 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 26 int hugetlb_report_meminfo(char *); 27 int hugetlb_report_node_meminfo(int, char *); 28 unsigned long hugetlb_total_pages(void); 29 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 30 unsigned long address, int write_access); 31 int hugetlb_reserve_pages(struct inode *inode, long from, long to); 32 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 33 34 extern unsigned long max_huge_pages; 35 extern unsigned long hugepages_treat_as_movable; 36 extern const unsigned long hugetlb_zero, hugetlb_infinity; 37 extern int sysctl_hugetlb_shm_group; 38 39 /* arch callbacks */ 40 41 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr); 42 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 43 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 44 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 45 int write); 46 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 47 pmd_t *pmd, int write); 48 int pmd_huge(pmd_t pmd); 49 void hugetlb_change_protection(struct vm_area_struct *vma, 50 unsigned long address, unsigned long end, pgprot_t newprot); 51 52 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE 53 #define is_hugepage_only_range(mm, addr, len) 0 54 #endif 55 56 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE 57 #define hugetlb_free_pgd_range free_pgd_range 58 #else 59 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr, 60 unsigned long end, unsigned long floor, 61 unsigned long ceiling); 62 #endif 63 64 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE 65 /* 66 * If the arch doesn't supply something else, assume that hugepage 67 * size aligned regions are ok without further preparation. 68 */ 69 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len) 70 { 71 if (len & ~HPAGE_MASK) 72 return -EINVAL; 73 if (addr & ~HPAGE_MASK) 74 return -EINVAL; 75 return 0; 76 } 77 #else 78 int prepare_hugepage_range(unsigned long addr, unsigned long len); 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 85 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 86 pte_t *ptep, pte_t pte); 87 pte_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 94 void hugetlb_prefault_arch_hook(struct mm_struct *mm); 95 #endif 96 97 #else /* !CONFIG_HUGETLB_PAGE */ 98 99 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 100 { 101 return 0; 102 } 103 static 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) (-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 132 struct hugetlbfs_config { 133 uid_t uid; 134 gid_t gid; 135 umode_t mode; 136 long nr_blocks; 137 long nr_inodes; 138 }; 139 140 struct 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 }; 147 148 149 struct hugetlbfs_inode_info { 150 struct shared_policy policy; 151 struct inode vfs_inode; 152 }; 153 154 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 155 { 156 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 157 } 158 159 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 160 { 161 return sb->s_fs_info; 162 } 163 164 extern const struct file_operations hugetlbfs_file_operations; 165 extern struct vm_operations_struct hugetlb_vm_ops; 166 struct file *hugetlb_file_setup(const char *name, size_t); 167 int hugetlb_get_quota(struct address_space *mapping); 168 void hugetlb_put_quota(struct address_space *mapping); 169 170 static 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 } 179 180 static 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 193 unsigned 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