1 #ifndef _LINUX_HUGETLB_H 2 #define _LINUX_HUGETLB_H 3 4 #ifdef CONFIG_HUGETLB_PAGE 5 6 #include <linux/mempolicy.h> 7 #include <asm/tlbflush.h> 8 9 struct ctl_table; 10 11 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 12 { 13 return vma->vm_flags & VM_HUGETLB; 14 } 15 16 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 17 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 18 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int); 19 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long); 20 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 21 int hugetlb_report_meminfo(char *); 22 int hugetlb_report_node_meminfo(int, char *); 23 int is_hugepage_mem_enough(size_t); 24 unsigned long hugetlb_total_pages(void); 25 struct page *alloc_huge_page(struct vm_area_struct *, unsigned long); 26 void free_huge_page(struct page *); 27 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 28 unsigned long address, int write_access); 29 30 extern unsigned long max_huge_pages; 31 extern const unsigned long hugetlb_zero, hugetlb_infinity; 32 extern int sysctl_hugetlb_shm_group; 33 34 /* arch callbacks */ 35 36 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr); 37 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 38 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 39 int write); 40 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 41 pmd_t *pmd, int write); 42 int is_aligned_hugepage_range(unsigned long addr, unsigned long len); 43 int pmd_huge(pmd_t pmd); 44 45 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE 46 #define is_hugepage_only_range(mm, addr, len) 0 47 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \ 48 do { } while (0) 49 #endif 50 51 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE 52 #define prepare_hugepage_range(addr, len) \ 53 is_aligned_hugepage_range(addr, len) 54 #else 55 int prepare_hugepage_range(unsigned long addr, unsigned long len); 56 #endif 57 58 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE 59 #define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte) 60 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep) 61 #else 62 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 63 pte_t *ptep, pte_t pte); 64 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 65 pte_t *ptep); 66 #endif 67 68 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK 69 #define hugetlb_prefault_arch_hook(mm) do { } while (0) 70 #else 71 void hugetlb_prefault_arch_hook(struct mm_struct *mm); 72 #endif 73 74 #else /* !CONFIG_HUGETLB_PAGE */ 75 76 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 77 { 78 return 0; 79 } 80 static inline unsigned long hugetlb_total_pages(void) 81 { 82 return 0; 83 } 84 85 #define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; }) 86 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 87 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 88 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 89 #define unmap_hugepage_range(vma, start, end) BUG() 90 #define is_hugepage_mem_enough(size) 0 91 #define hugetlb_report_meminfo(buf) 0 92 #define hugetlb_report_node_meminfo(n, buf) 0 93 #define follow_huge_pmd(mm, addr, pmd, write) NULL 94 #define is_aligned_hugepage_range(addr, len) 0 95 #define prepare_hugepage_range(addr, len) (-EINVAL) 96 #define pmd_huge(x) 0 97 #define is_hugepage_only_range(mm, addr, len) 0 98 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \ 99 do { } while (0) 100 #define alloc_huge_page(vma, addr) ({ NULL; }) 101 #define free_huge_page(p) ({ (void)(p); BUG(); }) 102 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; }) 103 104 #ifndef HPAGE_MASK 105 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */ 106 #define HPAGE_SIZE PAGE_SIZE 107 #endif 108 109 #endif /* !CONFIG_HUGETLB_PAGE */ 110 111 #ifdef CONFIG_HUGETLBFS 112 struct hugetlbfs_config { 113 uid_t uid; 114 gid_t gid; 115 umode_t mode; 116 long nr_blocks; 117 long nr_inodes; 118 }; 119 120 struct hugetlbfs_sb_info { 121 long max_blocks; /* blocks allowed */ 122 long free_blocks; /* blocks free */ 123 long max_inodes; /* inodes allowed */ 124 long free_inodes; /* inodes free */ 125 spinlock_t stat_lock; 126 }; 127 128 129 struct hugetlbfs_inode_info { 130 struct shared_policy policy; 131 struct inode vfs_inode; 132 }; 133 134 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 135 { 136 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 137 } 138 139 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 140 { 141 return sb->s_fs_info; 142 } 143 144 extern struct file_operations hugetlbfs_file_operations; 145 extern struct vm_operations_struct hugetlb_vm_ops; 146 struct file *hugetlb_zero_setup(size_t); 147 int hugetlb_get_quota(struct address_space *mapping); 148 void hugetlb_put_quota(struct address_space *mapping); 149 150 static inline int is_file_hugepages(struct file *file) 151 { 152 return file->f_op == &hugetlbfs_file_operations; 153 } 154 155 static inline void set_file_hugepages(struct file *file) 156 { 157 file->f_op = &hugetlbfs_file_operations; 158 } 159 #else /* !CONFIG_HUGETLBFS */ 160 161 #define is_file_hugepages(file) 0 162 #define set_file_hugepages(file) BUG() 163 #define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS) 164 165 #endif /* !CONFIG_HUGETLBFS */ 166 167 #endif /* _LINUX_HUGETLB_H */ 168