1 #ifndef _LINUX_HUGETLB_H 2 #define _LINUX_HUGETLB_H 3 4 #include <linux/fs.h> 5 6 struct ctl_table; 7 struct user_struct; 8 9 #ifdef CONFIG_HUGETLB_PAGE 10 11 #include <linux/mempolicy.h> 12 #include <linux/shm.h> 13 #include <asm/tlbflush.h> 14 15 int PageHuge(struct page *page); 16 17 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 18 { 19 return vma->vm_flags & VM_HUGETLB; 20 } 21 22 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 23 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 24 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 25 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 26 27 #ifdef CONFIG_NUMA 28 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, 29 void __user *, size_t *, loff_t *); 30 #endif 31 32 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 33 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 34 struct page **, struct vm_area_struct **, 35 unsigned long *, int *, int, unsigned int flags); 36 void unmap_hugepage_range(struct vm_area_struct *, 37 unsigned long, unsigned long, struct page *); 38 void __unmap_hugepage_range(struct vm_area_struct *, 39 unsigned long, unsigned long, struct page *); 40 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 41 void hugetlb_report_meminfo(struct seq_file *); 42 int hugetlb_report_node_meminfo(int, char *); 43 unsigned long hugetlb_total_pages(void); 44 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 45 unsigned long address, unsigned int flags); 46 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 47 struct vm_area_struct *vma, 48 int acctflags); 49 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 50 51 extern unsigned long hugepages_treat_as_movable; 52 extern const unsigned long hugetlb_zero, hugetlb_infinity; 53 extern int sysctl_hugetlb_shm_group; 54 extern struct list_head huge_boot_pages; 55 56 /* arch callbacks */ 57 58 pte_t *huge_pte_alloc(struct mm_struct *mm, 59 unsigned long addr, unsigned long sz); 60 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 61 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 62 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 63 int write); 64 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 65 pmd_t *pmd, int write); 66 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 67 pud_t *pud, int write); 68 int pmd_huge(pmd_t pmd); 69 int pud_huge(pud_t pmd); 70 void hugetlb_change_protection(struct vm_area_struct *vma, 71 unsigned long address, unsigned long end, pgprot_t newprot); 72 73 #else /* !CONFIG_HUGETLB_PAGE */ 74 75 static inline int PageHuge(struct page *page) 76 { 77 return 0; 78 } 79 80 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 81 { 82 return 0; 83 } 84 85 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 86 { 87 } 88 89 static inline unsigned long hugetlb_total_pages(void) 90 { 91 return 0; 92 } 93 94 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 95 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 96 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 97 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 98 #define unmap_hugepage_range(vma, start, end, page) BUG() 99 static inline void hugetlb_report_meminfo(struct seq_file *m) 100 { 101 } 102 #define hugetlb_report_node_meminfo(n, buf) 0 103 #define follow_huge_pmd(mm, addr, pmd, write) NULL 104 #define follow_huge_pud(mm, addr, pud, write) NULL 105 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 106 #define pmd_huge(x) 0 107 #define pud_huge(x) 0 108 #define is_hugepage_only_range(mm, addr, len) 0 109 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 110 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 111 112 #define hugetlb_change_protection(vma, address, end, newprot) 113 114 #ifndef HPAGE_MASK 115 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */ 116 #define HPAGE_SIZE PAGE_SIZE 117 #endif 118 119 #endif /* !CONFIG_HUGETLB_PAGE */ 120 121 #define HUGETLB_ANON_FILE "anon_hugepage" 122 123 enum { 124 /* 125 * The file will be used as an shm file so shmfs accounting rules 126 * apply 127 */ 128 HUGETLB_SHMFS_INODE = 1, 129 /* 130 * The file is being created on the internal vfs mount and shmfs 131 * accounting rules do not apply 132 */ 133 HUGETLB_ANONHUGE_INODE = 2, 134 }; 135 136 #ifdef CONFIG_HUGETLBFS 137 struct hugetlbfs_config { 138 uid_t uid; 139 gid_t gid; 140 umode_t mode; 141 long nr_blocks; 142 long nr_inodes; 143 struct hstate *hstate; 144 }; 145 146 struct hugetlbfs_sb_info { 147 long max_blocks; /* blocks allowed */ 148 long free_blocks; /* blocks free */ 149 long max_inodes; /* inodes allowed */ 150 long free_inodes; /* inodes free */ 151 spinlock_t stat_lock; 152 struct hstate *hstate; 153 }; 154 155 156 struct hugetlbfs_inode_info { 157 struct shared_policy policy; 158 struct inode vfs_inode; 159 }; 160 161 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 162 { 163 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 164 } 165 166 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 167 { 168 return sb->s_fs_info; 169 } 170 171 extern const struct file_operations hugetlbfs_file_operations; 172 extern const struct vm_operations_struct hugetlb_vm_ops; 173 struct file *hugetlb_file_setup(const char *name, size_t size, int acct, 174 struct user_struct **user, int creat_flags); 175 int hugetlb_get_quota(struct address_space *mapping, long delta); 176 void hugetlb_put_quota(struct address_space *mapping, long delta); 177 178 static inline int is_file_hugepages(struct file *file) 179 { 180 if (file->f_op == &hugetlbfs_file_operations) 181 return 1; 182 if (is_file_shm_hugepages(file)) 183 return 1; 184 185 return 0; 186 } 187 188 static inline void set_file_hugepages(struct file *file) 189 { 190 file->f_op = &hugetlbfs_file_operations; 191 } 192 #else /* !CONFIG_HUGETLBFS */ 193 194 #define is_file_hugepages(file) 0 195 #define set_file_hugepages(file) BUG() 196 static inline struct file *hugetlb_file_setup(const char *name, size_t size, 197 int acctflag, struct user_struct **user, int creat_flags) 198 { 199 return ERR_PTR(-ENOSYS); 200 } 201 202 #endif /* !CONFIG_HUGETLBFS */ 203 204 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 205 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 206 unsigned long len, unsigned long pgoff, 207 unsigned long flags); 208 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 209 210 #ifdef CONFIG_HUGETLB_PAGE 211 212 #define HSTATE_NAME_LEN 32 213 /* Defines one hugetlb page size */ 214 struct hstate { 215 int next_nid_to_alloc; 216 int next_nid_to_free; 217 unsigned int order; 218 unsigned long mask; 219 unsigned long max_huge_pages; 220 unsigned long nr_huge_pages; 221 unsigned long free_huge_pages; 222 unsigned long resv_huge_pages; 223 unsigned long surplus_huge_pages; 224 unsigned long nr_overcommit_huge_pages; 225 struct list_head hugepage_freelists[MAX_NUMNODES]; 226 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 227 unsigned int free_huge_pages_node[MAX_NUMNODES]; 228 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 229 char name[HSTATE_NAME_LEN]; 230 }; 231 232 struct huge_bootmem_page { 233 struct list_head list; 234 struct hstate *hstate; 235 }; 236 237 /* arch callback */ 238 int __init alloc_bootmem_huge_page(struct hstate *h); 239 240 void __init hugetlb_add_hstate(unsigned order); 241 struct hstate *size_to_hstate(unsigned long size); 242 243 #ifndef HUGE_MAX_HSTATE 244 #define HUGE_MAX_HSTATE 1 245 #endif 246 247 extern struct hstate hstates[HUGE_MAX_HSTATE]; 248 extern unsigned int default_hstate_idx; 249 250 #define default_hstate (hstates[default_hstate_idx]) 251 252 static inline struct hstate *hstate_inode(struct inode *i) 253 { 254 struct hugetlbfs_sb_info *hsb; 255 hsb = HUGETLBFS_SB(i->i_sb); 256 return hsb->hstate; 257 } 258 259 static inline struct hstate *hstate_file(struct file *f) 260 { 261 return hstate_inode(f->f_dentry->d_inode); 262 } 263 264 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 265 { 266 return hstate_file(vma->vm_file); 267 } 268 269 static inline unsigned long huge_page_size(struct hstate *h) 270 { 271 return (unsigned long)PAGE_SIZE << h->order; 272 } 273 274 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 275 276 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 277 278 static inline unsigned long huge_page_mask(struct hstate *h) 279 { 280 return h->mask; 281 } 282 283 static inline unsigned int huge_page_order(struct hstate *h) 284 { 285 return h->order; 286 } 287 288 static inline unsigned huge_page_shift(struct hstate *h) 289 { 290 return h->order + PAGE_SHIFT; 291 } 292 293 static inline unsigned int pages_per_huge_page(struct hstate *h) 294 { 295 return 1 << h->order; 296 } 297 298 static inline unsigned int blocks_per_huge_page(struct hstate *h) 299 { 300 return huge_page_size(h) / 512; 301 } 302 303 #include <asm/hugetlb.h> 304 305 static inline struct hstate *page_hstate(struct page *page) 306 { 307 return size_to_hstate(PAGE_SIZE << compound_order(page)); 308 } 309 310 #else 311 struct hstate {}; 312 #define alloc_bootmem_huge_page(h) NULL 313 #define hstate_file(f) NULL 314 #define hstate_vma(v) NULL 315 #define hstate_inode(i) NULL 316 #define huge_page_size(h) PAGE_SIZE 317 #define huge_page_mask(h) PAGE_MASK 318 #define vma_kernel_pagesize(v) PAGE_SIZE 319 #define vma_mmu_pagesize(v) PAGE_SIZE 320 #define huge_page_order(h) 0 321 #define huge_page_shift(h) PAGE_SHIFT 322 static inline unsigned int pages_per_huge_page(struct hstate *h) 323 { 324 return 1; 325 } 326 #endif 327 328 #endif /* _LINUX_HUGETLB_H */ 329