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 #include <linux/cgroup.h> 8 9 struct ctl_table; 10 struct user_struct; 11 struct mmu_gather; 12 13 #ifdef CONFIG_HUGETLB_PAGE 14 15 #include <linux/mempolicy.h> 16 #include <linux/shm.h> 17 #include <asm/tlbflush.h> 18 19 struct hugepage_subpool { 20 spinlock_t lock; 21 long count; 22 long max_hpages, used_hpages; 23 }; 24 25 extern spinlock_t hugetlb_lock; 26 extern int hugetlb_max_hstate __read_mostly; 27 #define for_each_hstate(h) \ 28 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++) 29 30 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks); 31 void hugepage_put_subpool(struct hugepage_subpool *spool); 32 33 int PageHuge(struct page *page); 34 35 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 36 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 37 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 38 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 39 40 #ifdef CONFIG_NUMA 41 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, 42 void __user *, size_t *, loff_t *); 43 #endif 44 45 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 46 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 47 struct page **, struct vm_area_struct **, 48 unsigned long *, int *, int, unsigned int flags); 49 void unmap_hugepage_range(struct vm_area_struct *, 50 unsigned long, unsigned long, struct page *); 51 void __unmap_hugepage_range_final(struct mmu_gather *tlb, 52 struct vm_area_struct *vma, 53 unsigned long start, unsigned long end, 54 struct page *ref_page); 55 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, 56 unsigned long start, unsigned long end, 57 struct page *ref_page); 58 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 59 void hugetlb_report_meminfo(struct seq_file *); 60 int hugetlb_report_node_meminfo(int, char *); 61 unsigned long hugetlb_total_pages(void); 62 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 63 unsigned long address, unsigned int flags); 64 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 65 struct vm_area_struct *vma, 66 vm_flags_t vm_flags); 67 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 68 int dequeue_hwpoisoned_huge_page(struct page *page); 69 void copy_huge_page(struct page *dst, struct page *src); 70 71 extern unsigned long hugepages_treat_as_movable; 72 extern const unsigned long hugetlb_zero, hugetlb_infinity; 73 extern int sysctl_hugetlb_shm_group; 74 extern struct list_head huge_boot_pages; 75 76 /* arch callbacks */ 77 78 pte_t *huge_pte_alloc(struct mm_struct *mm, 79 unsigned long addr, unsigned long sz); 80 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 81 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 82 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 83 int write); 84 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 85 pmd_t *pmd, int write); 86 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 87 pud_t *pud, int write); 88 int pmd_huge(pmd_t pmd); 89 int pud_huge(pud_t pmd); 90 void hugetlb_change_protection(struct vm_area_struct *vma, 91 unsigned long address, unsigned long end, pgprot_t newprot); 92 93 #else /* !CONFIG_HUGETLB_PAGE */ 94 95 static inline int PageHuge(struct page *page) 96 { 97 return 0; 98 } 99 100 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 101 { 102 } 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 static inline void hugetlb_report_meminfo(struct seq_file *m) 114 { 115 } 116 #define hugetlb_report_node_meminfo(n, buf) 0 117 #define follow_huge_pmd(mm, addr, pmd, write) NULL 118 #define follow_huge_pud(mm, addr, pud, write) NULL 119 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 120 #define pmd_huge(x) 0 121 #define pud_huge(x) 0 122 #define is_hugepage_only_range(mm, addr, len) 0 123 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 124 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 125 #define huge_pte_offset(mm, address) 0 126 static inline int dequeue_hwpoisoned_huge_page(struct page *page) 127 { 128 return 0; 129 } 130 131 static inline void copy_huge_page(struct page *dst, struct page *src) 132 { 133 } 134 135 #define hugetlb_change_protection(vma, address, end, newprot) 136 137 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb, 138 struct vm_area_struct *vma, unsigned long start, 139 unsigned long end, struct page *ref_page) 140 { 141 BUG(); 142 } 143 144 static inline void __unmap_hugepage_range(struct mmu_gather *tlb, 145 struct vm_area_struct *vma, unsigned long start, 146 unsigned long end, struct page *ref_page) 147 { 148 BUG(); 149 } 150 151 #endif /* !CONFIG_HUGETLB_PAGE */ 152 153 #define HUGETLB_ANON_FILE "anon_hugepage" 154 155 enum { 156 /* 157 * The file will be used as an shm file so shmfs accounting rules 158 * apply 159 */ 160 HUGETLB_SHMFS_INODE = 1, 161 /* 162 * The file is being created on the internal vfs mount and shmfs 163 * accounting rules do not apply 164 */ 165 HUGETLB_ANONHUGE_INODE = 2, 166 }; 167 168 #ifdef CONFIG_HUGETLBFS 169 struct hugetlbfs_sb_info { 170 long max_inodes; /* inodes allowed */ 171 long free_inodes; /* inodes free */ 172 spinlock_t stat_lock; 173 struct hstate *hstate; 174 struct hugepage_subpool *spool; 175 }; 176 177 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 178 { 179 return sb->s_fs_info; 180 } 181 182 extern const struct file_operations hugetlbfs_file_operations; 183 extern const struct vm_operations_struct hugetlb_vm_ops; 184 struct file *hugetlb_file_setup(const char *name, unsigned long addr, 185 size_t size, vm_flags_t acct, 186 struct user_struct **user, int creat_flags, 187 int page_size_log); 188 189 static inline int is_file_hugepages(struct file *file) 190 { 191 if (file->f_op == &hugetlbfs_file_operations) 192 return 1; 193 if (is_file_shm_hugepages(file)) 194 return 1; 195 196 return 0; 197 } 198 199 200 #else /* !CONFIG_HUGETLBFS */ 201 202 #define is_file_hugepages(file) 0 203 static inline struct file * 204 hugetlb_file_setup(const char *name, unsigned long addr, size_t size, 205 vm_flags_t acctflag, struct user_struct **user, int creat_flags, 206 int page_size_log) 207 { 208 return ERR_PTR(-ENOSYS); 209 } 210 211 #endif /* !CONFIG_HUGETLBFS */ 212 213 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 214 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 215 unsigned long len, unsigned long pgoff, 216 unsigned long flags); 217 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 218 219 #ifdef CONFIG_HUGETLB_PAGE 220 221 #define HSTATE_NAME_LEN 32 222 /* Defines one hugetlb page size */ 223 struct hstate { 224 int next_nid_to_alloc; 225 int next_nid_to_free; 226 unsigned int order; 227 unsigned long mask; 228 unsigned long max_huge_pages; 229 unsigned long nr_huge_pages; 230 unsigned long free_huge_pages; 231 unsigned long resv_huge_pages; 232 unsigned long surplus_huge_pages; 233 unsigned long nr_overcommit_huge_pages; 234 struct list_head hugepage_activelist; 235 struct list_head hugepage_freelists[MAX_NUMNODES]; 236 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 237 unsigned int free_huge_pages_node[MAX_NUMNODES]; 238 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 239 #ifdef CONFIG_CGROUP_HUGETLB 240 /* cgroup control files */ 241 struct cftype cgroup_files[5]; 242 #endif 243 char name[HSTATE_NAME_LEN]; 244 }; 245 246 struct huge_bootmem_page { 247 struct list_head list; 248 struct hstate *hstate; 249 #ifdef CONFIG_HIGHMEM 250 phys_addr_t phys; 251 #endif 252 }; 253 254 struct page *alloc_huge_page_node(struct hstate *h, int nid); 255 256 /* arch callback */ 257 int __init alloc_bootmem_huge_page(struct hstate *h); 258 259 void __init hugetlb_add_hstate(unsigned order); 260 struct hstate *size_to_hstate(unsigned long size); 261 262 #ifndef HUGE_MAX_HSTATE 263 #define HUGE_MAX_HSTATE 1 264 #endif 265 266 extern struct hstate hstates[HUGE_MAX_HSTATE]; 267 extern unsigned int default_hstate_idx; 268 269 #define default_hstate (hstates[default_hstate_idx]) 270 271 static inline struct hstate *hstate_inode(struct inode *i) 272 { 273 struct hugetlbfs_sb_info *hsb; 274 hsb = HUGETLBFS_SB(i->i_sb); 275 return hsb->hstate; 276 } 277 278 static inline struct hstate *hstate_file(struct file *f) 279 { 280 return hstate_inode(f->f_dentry->d_inode); 281 } 282 283 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 284 { 285 return hstate_file(vma->vm_file); 286 } 287 288 static inline unsigned long huge_page_size(struct hstate *h) 289 { 290 return (unsigned long)PAGE_SIZE << h->order; 291 } 292 293 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 294 295 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 296 297 static inline unsigned long huge_page_mask(struct hstate *h) 298 { 299 return h->mask; 300 } 301 302 static inline unsigned int huge_page_order(struct hstate *h) 303 { 304 return h->order; 305 } 306 307 static inline unsigned huge_page_shift(struct hstate *h) 308 { 309 return h->order + PAGE_SHIFT; 310 } 311 312 static inline unsigned int pages_per_huge_page(struct hstate *h) 313 { 314 return 1 << h->order; 315 } 316 317 static inline unsigned int blocks_per_huge_page(struct hstate *h) 318 { 319 return huge_page_size(h) / 512; 320 } 321 322 #include <asm/hugetlb.h> 323 324 #ifndef arch_make_huge_pte 325 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma, 326 struct page *page, int writable) 327 { 328 return entry; 329 } 330 #endif 331 332 static inline struct hstate *page_hstate(struct page *page) 333 { 334 return size_to_hstate(PAGE_SIZE << compound_order(page)); 335 } 336 337 static inline unsigned hstate_index_to_shift(unsigned index) 338 { 339 return hstates[index].order + PAGE_SHIFT; 340 } 341 342 static inline int hstate_index(struct hstate *h) 343 { 344 return h - hstates; 345 } 346 347 #else 348 struct hstate {}; 349 #define alloc_huge_page_node(h, nid) NULL 350 #define alloc_bootmem_huge_page(h) NULL 351 #define hstate_file(f) NULL 352 #define hstate_vma(v) NULL 353 #define hstate_inode(i) NULL 354 #define huge_page_size(h) PAGE_SIZE 355 #define huge_page_mask(h) PAGE_MASK 356 #define vma_kernel_pagesize(v) PAGE_SIZE 357 #define vma_mmu_pagesize(v) PAGE_SIZE 358 #define huge_page_order(h) 0 359 #define huge_page_shift(h) PAGE_SHIFT 360 static inline unsigned int pages_per_huge_page(struct hstate *h) 361 { 362 return 1; 363 } 364 #define hstate_index_to_shift(index) 0 365 #define hstate_index(h) 0 366 #endif 367 368 #endif /* _LINUX_HUGETLB_H */ 369