1 #ifndef _LINUX_HUGETLB_H 2 #define _LINUX_HUGETLB_H 3 4 #include <linux/mm_types.h> 5 #include <linux/fs.h> 6 #include <linux/hugetlb_inline.h> 7 8 struct ctl_table; 9 struct user_struct; 10 11 #ifdef CONFIG_HUGETLB_PAGE 12 13 #include <linux/mempolicy.h> 14 #include <linux/shm.h> 15 #include <asm/tlbflush.h> 16 17 int PageHuge(struct page *page); 18 19 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 20 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 21 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 22 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 23 24 #ifdef CONFIG_NUMA 25 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, 26 void __user *, size_t *, loff_t *); 27 #endif 28 29 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 30 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 31 struct page **, struct vm_area_struct **, 32 unsigned long *, int *, int, unsigned int flags); 33 void unmap_hugepage_range(struct vm_area_struct *, 34 unsigned long, unsigned long, struct page *); 35 void __unmap_hugepage_range(struct vm_area_struct *, 36 unsigned long, unsigned long, struct page *); 37 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 38 void hugetlb_report_meminfo(struct seq_file *); 39 int hugetlb_report_node_meminfo(int, char *); 40 unsigned long hugetlb_total_pages(void); 41 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 42 unsigned long address, unsigned int flags); 43 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 44 struct vm_area_struct *vma, 45 vm_flags_t vm_flags); 46 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 47 int dequeue_hwpoisoned_huge_page(struct page *page); 48 void copy_huge_page(struct page *dst, struct page *src); 49 50 extern unsigned long hugepages_treat_as_movable; 51 extern const unsigned long hugetlb_zero, hugetlb_infinity; 52 extern int sysctl_hugetlb_shm_group; 53 extern struct list_head huge_boot_pages; 54 55 /* arch callbacks */ 56 57 pte_t *huge_pte_alloc(struct mm_struct *mm, 58 unsigned long addr, unsigned long sz); 59 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 60 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 61 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 62 int write); 63 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 64 pmd_t *pmd, int write); 65 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 66 pud_t *pud, int write); 67 int pmd_huge(pmd_t pmd); 68 int pud_huge(pud_t pmd); 69 void hugetlb_change_protection(struct vm_area_struct *vma, 70 unsigned long address, unsigned long end, pgprot_t newprot); 71 72 #else /* !CONFIG_HUGETLB_PAGE */ 73 74 static inline int PageHuge(struct page *page) 75 { 76 return 0; 77 } 78 79 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 80 { 81 } 82 83 static inline unsigned long hugetlb_total_pages(void) 84 { 85 return 0; 86 } 87 88 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 89 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 90 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 91 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 92 #define unmap_hugepage_range(vma, start, end, page) BUG() 93 static inline void hugetlb_report_meminfo(struct seq_file *m) 94 { 95 } 96 #define hugetlb_report_node_meminfo(n, buf) 0 97 #define follow_huge_pmd(mm, addr, pmd, write) NULL 98 #define follow_huge_pud(mm, addr, pud, write) NULL 99 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 100 #define pmd_huge(x) 0 101 #define pud_huge(x) 0 102 #define is_hugepage_only_range(mm, addr, len) 0 103 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 104 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 105 #define huge_pte_offset(mm, address) 0 106 #define dequeue_hwpoisoned_huge_page(page) 0 107 static inline void copy_huge_page(struct page *dst, struct page *src) 108 { 109 } 110 111 #define hugetlb_change_protection(vma, address, end, newprot) 112 113 #endif /* !CONFIG_HUGETLB_PAGE */ 114 115 #define HUGETLB_ANON_FILE "anon_hugepage" 116 117 enum { 118 /* 119 * The file will be used as an shm file so shmfs accounting rules 120 * apply 121 */ 122 HUGETLB_SHMFS_INODE = 1, 123 /* 124 * The file is being created on the internal vfs mount and shmfs 125 * accounting rules do not apply 126 */ 127 HUGETLB_ANONHUGE_INODE = 2, 128 }; 129 130 #ifdef CONFIG_HUGETLBFS 131 struct hugetlbfs_config { 132 uid_t uid; 133 gid_t gid; 134 umode_t mode; 135 long nr_blocks; 136 long nr_inodes; 137 struct hstate *hstate; 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 struct hstate *hstate; 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 const struct vm_operations_struct hugetlb_vm_ops; 167 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct, 168 struct user_struct **user, int creat_flags); 169 int hugetlb_get_quota(struct address_space *mapping, long delta); 170 void hugetlb_put_quota(struct address_space *mapping, long delta); 171 172 static inline int is_file_hugepages(struct file *file) 173 { 174 if (file->f_op == &hugetlbfs_file_operations) 175 return 1; 176 if (is_file_shm_hugepages(file)) 177 return 1; 178 179 return 0; 180 } 181 182 static inline void set_file_hugepages(struct file *file) 183 { 184 file->f_op = &hugetlbfs_file_operations; 185 } 186 #else /* !CONFIG_HUGETLBFS */ 187 188 #define is_file_hugepages(file) 0 189 #define set_file_hugepages(file) BUG() 190 static inline struct file *hugetlb_file_setup(const char *name, size_t size, 191 vm_flags_t acctflag, struct user_struct **user, int creat_flags) 192 { 193 return ERR_PTR(-ENOSYS); 194 } 195 196 #endif /* !CONFIG_HUGETLBFS */ 197 198 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 199 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 200 unsigned long len, unsigned long pgoff, 201 unsigned long flags); 202 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 203 204 #ifdef CONFIG_HUGETLB_PAGE 205 206 #define HSTATE_NAME_LEN 32 207 /* Defines one hugetlb page size */ 208 struct hstate { 209 int next_nid_to_alloc; 210 int next_nid_to_free; 211 unsigned int order; 212 unsigned long mask; 213 unsigned long max_huge_pages; 214 unsigned long nr_huge_pages; 215 unsigned long free_huge_pages; 216 unsigned long resv_huge_pages; 217 unsigned long surplus_huge_pages; 218 unsigned long nr_overcommit_huge_pages; 219 struct list_head hugepage_freelists[MAX_NUMNODES]; 220 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 221 unsigned int free_huge_pages_node[MAX_NUMNODES]; 222 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 223 char name[HSTATE_NAME_LEN]; 224 }; 225 226 struct huge_bootmem_page { 227 struct list_head list; 228 struct hstate *hstate; 229 #ifdef CONFIG_HIGHMEM 230 phys_addr_t phys; 231 #endif 232 }; 233 234 struct page *alloc_huge_page_node(struct hstate *h, int nid); 235 236 /* arch callback */ 237 int __init alloc_bootmem_huge_page(struct hstate *h); 238 239 void __init hugetlb_add_hstate(unsigned order); 240 struct hstate *size_to_hstate(unsigned long size); 241 242 #ifndef HUGE_MAX_HSTATE 243 #define HUGE_MAX_HSTATE 1 244 #endif 245 246 extern struct hstate hstates[HUGE_MAX_HSTATE]; 247 extern unsigned int default_hstate_idx; 248 249 #define default_hstate (hstates[default_hstate_idx]) 250 251 static inline struct hstate *hstate_inode(struct inode *i) 252 { 253 struct hugetlbfs_sb_info *hsb; 254 hsb = HUGETLBFS_SB(i->i_sb); 255 return hsb->hstate; 256 } 257 258 static inline struct hstate *hstate_file(struct file *f) 259 { 260 return hstate_inode(f->f_dentry->d_inode); 261 } 262 263 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 264 { 265 return hstate_file(vma->vm_file); 266 } 267 268 static inline unsigned long huge_page_size(struct hstate *h) 269 { 270 return (unsigned long)PAGE_SIZE << h->order; 271 } 272 273 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 274 275 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 276 277 static inline unsigned long huge_page_mask(struct hstate *h) 278 { 279 return h->mask; 280 } 281 282 static inline unsigned int huge_page_order(struct hstate *h) 283 { 284 return h->order; 285 } 286 287 static inline unsigned huge_page_shift(struct hstate *h) 288 { 289 return h->order + PAGE_SHIFT; 290 } 291 292 static inline unsigned int pages_per_huge_page(struct hstate *h) 293 { 294 return 1 << h->order; 295 } 296 297 static inline unsigned int blocks_per_huge_page(struct hstate *h) 298 { 299 return huge_page_size(h) / 512; 300 } 301 302 #include <asm/hugetlb.h> 303 304 static inline struct hstate *page_hstate(struct page *page) 305 { 306 return size_to_hstate(PAGE_SIZE << compound_order(page)); 307 } 308 309 static inline unsigned hstate_index_to_shift(unsigned index) 310 { 311 return hstates[index].order + PAGE_SHIFT; 312 } 313 314 #else 315 struct hstate {}; 316 #define alloc_huge_page_node(h, nid) NULL 317 #define alloc_bootmem_huge_page(h) NULL 318 #define hstate_file(f) NULL 319 #define hstate_vma(v) NULL 320 #define hstate_inode(i) NULL 321 #define huge_page_size(h) PAGE_SIZE 322 #define huge_page_mask(h) PAGE_MASK 323 #define vma_kernel_pagesize(v) PAGE_SIZE 324 #define vma_mmu_pagesize(v) PAGE_SIZE 325 #define huge_page_order(h) 0 326 #define huge_page_shift(h) PAGE_SHIFT 327 static inline unsigned int pages_per_huge_page(struct hstate *h) 328 { 329 return 1; 330 } 331 #define hstate_index_to_shift(index) 0 332 #endif 333 334 #endif /* _LINUX_HUGETLB_H */ 335