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 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int); 25 void unmap_hugepage_range(struct vm_area_struct *, 26 unsigned long, unsigned long, struct page *); 27 void __unmap_hugepage_range(struct vm_area_struct *, 28 unsigned long, unsigned long, struct page *); 29 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 30 void hugetlb_report_meminfo(struct seq_file *); 31 int hugetlb_report_node_meminfo(int, char *); 32 unsigned long hugetlb_total_pages(void); 33 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 34 unsigned long address, int write_access); 35 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 36 struct vm_area_struct *vma, 37 int acctflags); 38 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 39 40 extern unsigned long hugepages_treat_as_movable; 41 extern const unsigned long hugetlb_zero, hugetlb_infinity; 42 extern int sysctl_hugetlb_shm_group; 43 extern struct list_head huge_boot_pages; 44 45 /* arch callbacks */ 46 47 pte_t *huge_pte_alloc(struct mm_struct *mm, 48 unsigned long addr, unsigned long sz); 49 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 50 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 51 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 52 int write); 53 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 54 pmd_t *pmd, int write); 55 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 56 pud_t *pud, int write); 57 int pmd_huge(pmd_t pmd); 58 int pud_huge(pud_t pmd); 59 void hugetlb_change_protection(struct vm_area_struct *vma, 60 unsigned long address, unsigned long end, pgprot_t newprot); 61 62 #else /* !CONFIG_HUGETLB_PAGE */ 63 64 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 65 { 66 return 0; 67 } 68 69 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 70 { 71 } 72 73 static inline unsigned long hugetlb_total_pages(void) 74 { 75 return 0; 76 } 77 78 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 79 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 80 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 81 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 82 #define unmap_hugepage_range(vma, start, end, page) BUG() 83 static inline void hugetlb_report_meminfo(struct seq_file *m) 84 { 85 } 86 #define hugetlb_report_node_meminfo(n, buf) 0 87 #define follow_huge_pmd(mm, addr, pmd, write) NULL 88 #define follow_huge_pud(mm, addr, pud, write) NULL 89 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 90 #define pmd_huge(x) 0 91 #define pud_huge(x) 0 92 #define is_hugepage_only_range(mm, addr, len) 0 93 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 94 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; }) 95 96 #define hugetlb_change_protection(vma, address, end, newprot) 97 98 #ifndef HPAGE_MASK 99 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */ 100 #define HPAGE_SIZE PAGE_SIZE 101 #endif 102 103 #endif /* !CONFIG_HUGETLB_PAGE */ 104 105 #ifdef CONFIG_HUGETLBFS 106 struct hugetlbfs_config { 107 uid_t uid; 108 gid_t gid; 109 umode_t mode; 110 long nr_blocks; 111 long nr_inodes; 112 struct hstate *hstate; 113 }; 114 115 struct hugetlbfs_sb_info { 116 long max_blocks; /* blocks allowed */ 117 long free_blocks; /* blocks free */ 118 long max_inodes; /* inodes allowed */ 119 long free_inodes; /* inodes free */ 120 spinlock_t stat_lock; 121 struct hstate *hstate; 122 }; 123 124 125 struct hugetlbfs_inode_info { 126 struct shared_policy policy; 127 struct inode vfs_inode; 128 }; 129 130 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 131 { 132 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 133 } 134 135 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 136 { 137 return sb->s_fs_info; 138 } 139 140 extern const struct file_operations hugetlbfs_file_operations; 141 extern struct vm_operations_struct hugetlb_vm_ops; 142 struct file *hugetlb_file_setup(const char *name, size_t, int); 143 int hugetlb_get_quota(struct address_space *mapping, long delta); 144 void hugetlb_put_quota(struct address_space *mapping, long delta); 145 146 static inline int is_file_hugepages(struct file *file) 147 { 148 if (file->f_op == &hugetlbfs_file_operations) 149 return 1; 150 if (is_file_shm_hugepages(file)) 151 return 1; 152 153 return 0; 154 } 155 156 static inline void set_file_hugepages(struct file *file) 157 { 158 file->f_op = &hugetlbfs_file_operations; 159 } 160 #else /* !CONFIG_HUGETLBFS */ 161 162 #define is_file_hugepages(file) 0 163 #define set_file_hugepages(file) BUG() 164 #define hugetlb_file_setup(name,size,acctflag) ERR_PTR(-ENOSYS) 165 166 #endif /* !CONFIG_HUGETLBFS */ 167 168 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 169 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 170 unsigned long len, unsigned long pgoff, 171 unsigned long flags); 172 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 173 174 #ifdef CONFIG_HUGETLB_PAGE 175 176 #define HSTATE_NAME_LEN 32 177 /* Defines one hugetlb page size */ 178 struct hstate { 179 int hugetlb_next_nid; 180 unsigned int order; 181 unsigned long mask; 182 unsigned long max_huge_pages; 183 unsigned long nr_huge_pages; 184 unsigned long free_huge_pages; 185 unsigned long resv_huge_pages; 186 unsigned long surplus_huge_pages; 187 unsigned long nr_overcommit_huge_pages; 188 struct list_head hugepage_freelists[MAX_NUMNODES]; 189 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 190 unsigned int free_huge_pages_node[MAX_NUMNODES]; 191 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 192 char name[HSTATE_NAME_LEN]; 193 }; 194 195 struct huge_bootmem_page { 196 struct list_head list; 197 struct hstate *hstate; 198 }; 199 200 /* arch callback */ 201 int __init alloc_bootmem_huge_page(struct hstate *h); 202 203 void __init hugetlb_add_hstate(unsigned order); 204 struct hstate *size_to_hstate(unsigned long size); 205 206 #ifndef HUGE_MAX_HSTATE 207 #define HUGE_MAX_HSTATE 1 208 #endif 209 210 extern struct hstate hstates[HUGE_MAX_HSTATE]; 211 extern unsigned int default_hstate_idx; 212 213 #define default_hstate (hstates[default_hstate_idx]) 214 215 static inline struct hstate *hstate_inode(struct inode *i) 216 { 217 struct hugetlbfs_sb_info *hsb; 218 hsb = HUGETLBFS_SB(i->i_sb); 219 return hsb->hstate; 220 } 221 222 static inline struct hstate *hstate_file(struct file *f) 223 { 224 return hstate_inode(f->f_dentry->d_inode); 225 } 226 227 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 228 { 229 return hstate_file(vma->vm_file); 230 } 231 232 static inline unsigned long huge_page_size(struct hstate *h) 233 { 234 return (unsigned long)PAGE_SIZE << h->order; 235 } 236 237 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 238 239 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 240 241 static inline unsigned long huge_page_mask(struct hstate *h) 242 { 243 return h->mask; 244 } 245 246 static inline unsigned int huge_page_order(struct hstate *h) 247 { 248 return h->order; 249 } 250 251 static inline unsigned huge_page_shift(struct hstate *h) 252 { 253 return h->order + PAGE_SHIFT; 254 } 255 256 static inline unsigned int pages_per_huge_page(struct hstate *h) 257 { 258 return 1 << h->order; 259 } 260 261 static inline unsigned int blocks_per_huge_page(struct hstate *h) 262 { 263 return huge_page_size(h) / 512; 264 } 265 266 #include <asm/hugetlb.h> 267 268 static inline struct hstate *page_hstate(struct page *page) 269 { 270 return size_to_hstate(PAGE_SIZE << compound_order(page)); 271 } 272 273 #else 274 struct hstate {}; 275 #define alloc_bootmem_huge_page(h) NULL 276 #define hstate_file(f) NULL 277 #define hstate_vma(v) NULL 278 #define hstate_inode(i) NULL 279 #define huge_page_size(h) PAGE_SIZE 280 #define huge_page_mask(h) PAGE_MASK 281 #define vma_kernel_pagesize(v) PAGE_SIZE 282 #define vma_mmu_pagesize(v) PAGE_SIZE 283 #define huge_page_order(h) 0 284 #define huge_page_shift(h) PAGE_SHIFT 285 static inline unsigned int pages_per_huge_page(struct hstate *h) 286 { 287 return 1; 288 } 289 #endif 290 291 #endif /* _LINUX_HUGETLB_H */ 292