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 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 47 struct page **, struct vm_area_struct **, 48 unsigned long *, unsigned long *, long, unsigned int); 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 void hugetlb_report_meminfo(struct seq_file *); 59 int hugetlb_report_node_meminfo(int, char *); 60 void hugetlb_show_meminfo(void); 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 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE 72 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud); 73 #endif 74 75 extern unsigned long hugepages_treat_as_movable; 76 extern const unsigned long hugetlb_zero, hugetlb_infinity; 77 extern int sysctl_hugetlb_shm_group; 78 extern struct list_head huge_boot_pages; 79 80 /* arch callbacks */ 81 82 pte_t *huge_pte_alloc(struct mm_struct *mm, 83 unsigned long addr, unsigned long sz); 84 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 85 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 86 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 87 int write); 88 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 89 pmd_t *pmd, int write); 90 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 91 pud_t *pud, int write); 92 int pmd_huge(pmd_t pmd); 93 int pud_huge(pud_t pmd); 94 unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 95 unsigned long address, unsigned long end, pgprot_t newprot); 96 97 #else /* !CONFIG_HUGETLB_PAGE */ 98 99 static inline int PageHuge(struct page *page) 100 { 101 return 0; 102 } 103 104 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 105 { 106 } 107 108 static inline unsigned long hugetlb_total_pages(void) 109 { 110 return 0; 111 } 112 113 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 114 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 115 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 116 static inline void hugetlb_report_meminfo(struct seq_file *m) 117 { 118 } 119 #define hugetlb_report_node_meminfo(n, buf) 0 120 static inline void hugetlb_show_meminfo(void) 121 { 122 } 123 #define follow_huge_pmd(mm, addr, pmd, write) NULL 124 #define follow_huge_pud(mm, addr, pud, write) NULL 125 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 126 #define pmd_huge(x) 0 127 #define pud_huge(x) 0 128 #define is_hugepage_only_range(mm, addr, len) 0 129 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 130 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 131 #define huge_pte_offset(mm, address) 0 132 static inline int dequeue_hwpoisoned_huge_page(struct page *page) 133 { 134 return 0; 135 } 136 137 static inline void copy_huge_page(struct page *dst, struct page *src) 138 { 139 } 140 141 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 142 unsigned long address, unsigned long end, pgprot_t newprot) 143 { 144 return 0; 145 } 146 147 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb, 148 struct vm_area_struct *vma, unsigned long start, 149 unsigned long end, struct page *ref_page) 150 { 151 BUG(); 152 } 153 154 static inline void __unmap_hugepage_range(struct mmu_gather *tlb, 155 struct vm_area_struct *vma, unsigned long start, 156 unsigned long end, struct page *ref_page) 157 { 158 BUG(); 159 } 160 161 #endif /* !CONFIG_HUGETLB_PAGE */ 162 163 #define HUGETLB_ANON_FILE "anon_hugepage" 164 165 enum { 166 /* 167 * The file will be used as an shm file so shmfs accounting rules 168 * apply 169 */ 170 HUGETLB_SHMFS_INODE = 1, 171 /* 172 * The file is being created on the internal vfs mount and shmfs 173 * accounting rules do not apply 174 */ 175 HUGETLB_ANONHUGE_INODE = 2, 176 }; 177 178 #ifdef CONFIG_HUGETLBFS 179 struct hugetlbfs_sb_info { 180 long max_inodes; /* inodes allowed */ 181 long free_inodes; /* inodes free */ 182 spinlock_t stat_lock; 183 struct hstate *hstate; 184 struct hugepage_subpool *spool; 185 }; 186 187 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 188 { 189 return sb->s_fs_info; 190 } 191 192 extern const struct file_operations hugetlbfs_file_operations; 193 extern const struct vm_operations_struct hugetlb_vm_ops; 194 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct, 195 struct user_struct **user, int creat_flags, 196 int page_size_log); 197 198 static inline int is_file_hugepages(struct file *file) 199 { 200 if (file->f_op == &hugetlbfs_file_operations) 201 return 1; 202 if (is_file_shm_hugepages(file)) 203 return 1; 204 205 return 0; 206 } 207 208 209 #else /* !CONFIG_HUGETLBFS */ 210 211 #define is_file_hugepages(file) 0 212 static inline struct file * 213 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag, 214 struct user_struct **user, int creat_flags, 215 int page_size_log) 216 { 217 return ERR_PTR(-ENOSYS); 218 } 219 220 #endif /* !CONFIG_HUGETLBFS */ 221 222 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 223 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 224 unsigned long len, unsigned long pgoff, 225 unsigned long flags); 226 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 227 228 #ifdef CONFIG_HUGETLB_PAGE 229 230 #define HSTATE_NAME_LEN 32 231 /* Defines one hugetlb page size */ 232 struct hstate { 233 int next_nid_to_alloc; 234 int next_nid_to_free; 235 unsigned int order; 236 unsigned long mask; 237 unsigned long max_huge_pages; 238 unsigned long nr_huge_pages; 239 unsigned long free_huge_pages; 240 unsigned long resv_huge_pages; 241 unsigned long surplus_huge_pages; 242 unsigned long nr_overcommit_huge_pages; 243 struct list_head hugepage_activelist; 244 struct list_head hugepage_freelists[MAX_NUMNODES]; 245 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 246 unsigned int free_huge_pages_node[MAX_NUMNODES]; 247 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 248 #ifdef CONFIG_CGROUP_HUGETLB 249 /* cgroup control files */ 250 struct cftype cgroup_files[5]; 251 #endif 252 char name[HSTATE_NAME_LEN]; 253 }; 254 255 struct huge_bootmem_page { 256 struct list_head list; 257 struct hstate *hstate; 258 #ifdef CONFIG_HIGHMEM 259 phys_addr_t phys; 260 #endif 261 }; 262 263 struct page *alloc_huge_page_node(struct hstate *h, int nid); 264 265 /* arch callback */ 266 int __init alloc_bootmem_huge_page(struct hstate *h); 267 268 void __init hugetlb_add_hstate(unsigned order); 269 struct hstate *size_to_hstate(unsigned long size); 270 271 #ifndef HUGE_MAX_HSTATE 272 #define HUGE_MAX_HSTATE 1 273 #endif 274 275 extern struct hstate hstates[HUGE_MAX_HSTATE]; 276 extern unsigned int default_hstate_idx; 277 278 #define default_hstate (hstates[default_hstate_idx]) 279 280 static inline struct hstate *hstate_inode(struct inode *i) 281 { 282 struct hugetlbfs_sb_info *hsb; 283 hsb = HUGETLBFS_SB(i->i_sb); 284 return hsb->hstate; 285 } 286 287 static inline struct hstate *hstate_file(struct file *f) 288 { 289 return hstate_inode(file_inode(f)); 290 } 291 292 static inline struct hstate *hstate_sizelog(int page_size_log) 293 { 294 if (!page_size_log) 295 return &default_hstate; 296 return size_to_hstate(1 << page_size_log); 297 } 298 299 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 300 { 301 return hstate_file(vma->vm_file); 302 } 303 304 static inline unsigned long huge_page_size(struct hstate *h) 305 { 306 return (unsigned long)PAGE_SIZE << h->order; 307 } 308 309 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 310 311 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 312 313 static inline unsigned long huge_page_mask(struct hstate *h) 314 { 315 return h->mask; 316 } 317 318 static inline unsigned int huge_page_order(struct hstate *h) 319 { 320 return h->order; 321 } 322 323 static inline unsigned huge_page_shift(struct hstate *h) 324 { 325 return h->order + PAGE_SHIFT; 326 } 327 328 static inline unsigned int pages_per_huge_page(struct hstate *h) 329 { 330 return 1 << h->order; 331 } 332 333 static inline unsigned int blocks_per_huge_page(struct hstate *h) 334 { 335 return huge_page_size(h) / 512; 336 } 337 338 #include <asm/hugetlb.h> 339 340 #ifndef arch_make_huge_pte 341 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma, 342 struct page *page, int writable) 343 { 344 return entry; 345 } 346 #endif 347 348 static inline struct hstate *page_hstate(struct page *page) 349 { 350 return size_to_hstate(PAGE_SIZE << compound_order(page)); 351 } 352 353 static inline unsigned hstate_index_to_shift(unsigned index) 354 { 355 return hstates[index].order + PAGE_SHIFT; 356 } 357 358 static inline int hstate_index(struct hstate *h) 359 { 360 return h - hstates; 361 } 362 363 pgoff_t __basepage_index(struct page *page); 364 365 /* Return page->index in PAGE_SIZE units */ 366 static inline pgoff_t basepage_index(struct page *page) 367 { 368 if (!PageCompound(page)) 369 return page->index; 370 371 return __basepage_index(page); 372 } 373 374 #else /* CONFIG_HUGETLB_PAGE */ 375 struct hstate {}; 376 #define alloc_huge_page_node(h, nid) NULL 377 #define alloc_bootmem_huge_page(h) NULL 378 #define hstate_file(f) NULL 379 #define hstate_sizelog(s) NULL 380 #define hstate_vma(v) NULL 381 #define hstate_inode(i) NULL 382 #define huge_page_size(h) PAGE_SIZE 383 #define huge_page_mask(h) PAGE_MASK 384 #define vma_kernel_pagesize(v) PAGE_SIZE 385 #define vma_mmu_pagesize(v) PAGE_SIZE 386 #define huge_page_order(h) 0 387 #define huge_page_shift(h) PAGE_SHIFT 388 static inline unsigned int pages_per_huge_page(struct hstate *h) 389 { 390 return 1; 391 } 392 #define hstate_index_to_shift(index) 0 393 #define hstate_index(h) 0 394 395 static inline pgoff_t basepage_index(struct page *page) 396 { 397 return page->index; 398 } 399 #endif /* CONFIG_HUGETLB_PAGE */ 400 401 #endif /* _LINUX_HUGETLB_H */ 402