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, 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 unsigned long nr_overcommit_huge_pages; 37 extern const unsigned long hugetlb_zero, hugetlb_infinity; 38 extern int sysctl_hugetlb_shm_group; 39 40 /* arch callbacks */ 41 42 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr); 43 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 44 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 45 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 46 int write); 47 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 48 pmd_t *pmd, int write); 49 int pmd_huge(pmd_t pmd); 50 void hugetlb_change_protection(struct vm_area_struct *vma, 51 unsigned long address, unsigned long end, pgprot_t newprot); 52 53 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE 54 #define is_hugepage_only_range(mm, addr, len) 0 55 #endif 56 57 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE 58 #define hugetlb_free_pgd_range free_pgd_range 59 #else 60 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr, 61 unsigned long end, unsigned long floor, 62 unsigned long ceiling); 63 #endif 64 65 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE 66 /* 67 * If the arch doesn't supply something else, assume that hugepage 68 * size aligned regions are ok without further preparation. 69 */ 70 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len) 71 { 72 if (len & ~HPAGE_MASK) 73 return -EINVAL; 74 if (addr & ~HPAGE_MASK) 75 return -EINVAL; 76 return 0; 77 } 78 #else 79 int prepare_hugepage_range(unsigned long addr, unsigned long len); 80 #endif 81 82 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE 83 #define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte) 84 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep) 85 #else 86 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 87 pte_t *ptep, pte_t pte); 88 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 89 pte_t *ptep); 90 #endif 91 92 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK 93 #define hugetlb_prefault_arch_hook(mm) do { } while (0) 94 #else 95 void hugetlb_prefault_arch_hook(struct mm_struct *mm); 96 #endif 97 98 #else /* !CONFIG_HUGETLB_PAGE */ 99 100 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 101 { 102 return 0; 103 } 104 static inline unsigned long hugetlb_total_pages(void) 105 { 106 return 0; 107 } 108 109 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 110 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 111 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 112 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 113 #define unmap_hugepage_range(vma, start, end) BUG() 114 #define hugetlb_report_meminfo(buf) 0 115 #define hugetlb_report_node_meminfo(n, buf) 0 116 #define follow_huge_pmd(mm, addr, pmd, write) NULL 117 #define prepare_hugepage_range(addr,len) (-EINVAL) 118 #define pmd_huge(x) 0 119 #define is_hugepage_only_range(mm, addr, len) 0 120 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 121 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; }) 122 123 #define hugetlb_change_protection(vma, address, end, newprot) 124 125 #ifndef HPAGE_MASK 126 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */ 127 #define HPAGE_SIZE PAGE_SIZE 128 #endif 129 130 #endif /* !CONFIG_HUGETLB_PAGE */ 131 132 #ifdef CONFIG_HUGETLBFS 133 struct hugetlbfs_config { 134 uid_t uid; 135 gid_t gid; 136 umode_t mode; 137 long nr_blocks; 138 long nr_inodes; 139 }; 140 141 struct hugetlbfs_sb_info { 142 long max_blocks; /* blocks allowed */ 143 long free_blocks; /* blocks free */ 144 long max_inodes; /* inodes allowed */ 145 long free_inodes; /* inodes free */ 146 spinlock_t stat_lock; 147 }; 148 149 150 struct hugetlbfs_inode_info { 151 struct shared_policy policy; 152 struct inode vfs_inode; 153 }; 154 155 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 156 { 157 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 158 } 159 160 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 161 { 162 return sb->s_fs_info; 163 } 164 165 extern const struct file_operations hugetlbfs_file_operations; 166 extern struct vm_operations_struct hugetlb_vm_ops; 167 struct file *hugetlb_file_setup(const char *name, size_t); 168 int hugetlb_get_quota(struct address_space *mapping, long delta); 169 void hugetlb_put_quota(struct address_space *mapping, long delta); 170 171 #define BLOCKS_PER_HUGEPAGE (HPAGE_SIZE / 512) 172 173 static inline int is_file_hugepages(struct file *file) 174 { 175 if (file->f_op == &hugetlbfs_file_operations) 176 return 1; 177 if (is_file_shm_hugepages(file)) 178 return 1; 179 180 return 0; 181 } 182 183 static inline void set_file_hugepages(struct file *file) 184 { 185 file->f_op = &hugetlbfs_file_operations; 186 } 187 #else /* !CONFIG_HUGETLBFS */ 188 189 #define is_file_hugepages(file) 0 190 #define set_file_hugepages(file) BUG() 191 #define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS) 192 193 #endif /* !CONFIG_HUGETLBFS */ 194 195 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 196 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 197 unsigned long len, unsigned long pgoff, 198 unsigned long flags); 199 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 200 201 #endif /* _LINUX_HUGETLB_H */ 202