1 #ifndef _LINUX_HUGETLB_H 2 #define _LINUX_HUGETLB_H 3 4 #include <linux/mm_types.h> 5 #include <linux/mmdebug.h> 6 #include <linux/fs.h> 7 #include <linux/hugetlb_inline.h> 8 #include <linux/cgroup.h> 9 #include <linux/list.h> 10 #include <linux/kref.h> 11 12 struct ctl_table; 13 struct user_struct; 14 struct mmu_gather; 15 16 #ifdef CONFIG_HUGETLB_PAGE 17 18 #include <linux/mempolicy.h> 19 #include <linux/shm.h> 20 #include <asm/tlbflush.h> 21 22 struct hugepage_subpool { 23 spinlock_t lock; 24 long count; 25 long max_hpages, used_hpages; 26 }; 27 28 struct resv_map { 29 struct kref refs; 30 spinlock_t lock; 31 struct list_head regions; 32 }; 33 extern struct resv_map *resv_map_alloc(void); 34 void resv_map_release(struct kref *ref); 35 36 extern spinlock_t hugetlb_lock; 37 extern int hugetlb_max_hstate __read_mostly; 38 #define for_each_hstate(h) \ 39 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++) 40 41 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks); 42 void hugepage_put_subpool(struct hugepage_subpool *spool); 43 44 int PageHuge(struct page *page); 45 46 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 47 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 48 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 49 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 50 51 #ifdef CONFIG_NUMA 52 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, 53 void __user *, size_t *, loff_t *); 54 #endif 55 56 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 57 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 58 struct page **, struct vm_area_struct **, 59 unsigned long *, unsigned long *, long, unsigned int); 60 void unmap_hugepage_range(struct vm_area_struct *, 61 unsigned long, unsigned long, struct page *); 62 void __unmap_hugepage_range_final(struct mmu_gather *tlb, 63 struct vm_area_struct *vma, 64 unsigned long start, unsigned long end, 65 struct page *ref_page); 66 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, 67 unsigned long start, unsigned long end, 68 struct page *ref_page); 69 void hugetlb_report_meminfo(struct seq_file *); 70 int hugetlb_report_node_meminfo(int, char *); 71 void hugetlb_show_meminfo(void); 72 unsigned long hugetlb_total_pages(void); 73 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 74 unsigned long address, unsigned int flags); 75 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 76 struct vm_area_struct *vma, 77 vm_flags_t vm_flags); 78 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 79 int dequeue_hwpoisoned_huge_page(struct page *page); 80 bool isolate_huge_page(struct page *page, struct list_head *list); 81 void putback_active_hugepage(struct page *page); 82 bool is_hugepage_active(struct page *page); 83 84 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE 85 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud); 86 #endif 87 88 extern unsigned long hugepages_treat_as_movable; 89 extern const unsigned long hugetlb_zero, hugetlb_infinity; 90 extern int sysctl_hugetlb_shm_group; 91 extern struct list_head huge_boot_pages; 92 93 /* arch callbacks */ 94 95 pte_t *huge_pte_alloc(struct mm_struct *mm, 96 unsigned long addr, unsigned long sz); 97 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 98 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 99 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 100 int write); 101 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 102 pmd_t *pmd, int write); 103 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 104 pud_t *pud, int write); 105 int pmd_huge(pmd_t pmd); 106 int pud_huge(pud_t pmd); 107 unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 108 unsigned long address, unsigned long end, pgprot_t newprot); 109 110 #else /* !CONFIG_HUGETLB_PAGE */ 111 112 static inline int PageHuge(struct page *page) 113 { 114 return 0; 115 } 116 117 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 118 { 119 } 120 121 static inline unsigned long hugetlb_total_pages(void) 122 { 123 return 0; 124 } 125 126 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 127 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 128 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 129 static inline void hugetlb_report_meminfo(struct seq_file *m) 130 { 131 } 132 #define hugetlb_report_node_meminfo(n, buf) 0 133 static inline void hugetlb_show_meminfo(void) 134 { 135 } 136 #define follow_huge_pmd(mm, addr, pmd, write) NULL 137 #define follow_huge_pud(mm, addr, pud, write) NULL 138 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 139 #define pmd_huge(x) 0 140 #define pud_huge(x) 0 141 #define is_hugepage_only_range(mm, addr, len) 0 142 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 143 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 144 #define huge_pte_offset(mm, address) 0 145 static inline int dequeue_hwpoisoned_huge_page(struct page *page) 146 { 147 return 0; 148 } 149 150 static inline bool isolate_huge_page(struct page *page, struct list_head *list) 151 { 152 return false; 153 } 154 #define putback_active_hugepage(p) do {} while (0) 155 #define is_hugepage_active(x) false 156 157 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 158 unsigned long address, unsigned long end, pgprot_t newprot) 159 { 160 return 0; 161 } 162 163 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb, 164 struct vm_area_struct *vma, unsigned long start, 165 unsigned long end, struct page *ref_page) 166 { 167 BUG(); 168 } 169 170 static inline void __unmap_hugepage_range(struct mmu_gather *tlb, 171 struct vm_area_struct *vma, unsigned long start, 172 unsigned long end, struct page *ref_page) 173 { 174 BUG(); 175 } 176 177 #endif /* !CONFIG_HUGETLB_PAGE */ 178 179 #define HUGETLB_ANON_FILE "anon_hugepage" 180 181 enum { 182 /* 183 * The file will be used as an shm file so shmfs accounting rules 184 * apply 185 */ 186 HUGETLB_SHMFS_INODE = 1, 187 /* 188 * The file is being created on the internal vfs mount and shmfs 189 * accounting rules do not apply 190 */ 191 HUGETLB_ANONHUGE_INODE = 2, 192 }; 193 194 #ifdef CONFIG_HUGETLBFS 195 struct hugetlbfs_sb_info { 196 long max_inodes; /* inodes allowed */ 197 long free_inodes; /* inodes free */ 198 spinlock_t stat_lock; 199 struct hstate *hstate; 200 struct hugepage_subpool *spool; 201 }; 202 203 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 204 { 205 return sb->s_fs_info; 206 } 207 208 extern const struct file_operations hugetlbfs_file_operations; 209 extern const struct vm_operations_struct hugetlb_vm_ops; 210 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct, 211 struct user_struct **user, int creat_flags, 212 int page_size_log); 213 214 static inline int is_file_hugepages(struct file *file) 215 { 216 if (file->f_op == &hugetlbfs_file_operations) 217 return 1; 218 if (is_file_shm_hugepages(file)) 219 return 1; 220 221 return 0; 222 } 223 224 225 #else /* !CONFIG_HUGETLBFS */ 226 227 #define is_file_hugepages(file) 0 228 static inline struct file * 229 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag, 230 struct user_struct **user, int creat_flags, 231 int page_size_log) 232 { 233 return ERR_PTR(-ENOSYS); 234 } 235 236 #endif /* !CONFIG_HUGETLBFS */ 237 238 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 239 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 240 unsigned long len, unsigned long pgoff, 241 unsigned long flags); 242 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 243 244 #ifdef CONFIG_HUGETLB_PAGE 245 246 #define HSTATE_NAME_LEN 32 247 /* Defines one hugetlb page size */ 248 struct hstate { 249 int next_nid_to_alloc; 250 int next_nid_to_free; 251 unsigned int order; 252 unsigned long mask; 253 unsigned long max_huge_pages; 254 unsigned long nr_huge_pages; 255 unsigned long free_huge_pages; 256 unsigned long resv_huge_pages; 257 unsigned long surplus_huge_pages; 258 unsigned long nr_overcommit_huge_pages; 259 struct list_head hugepage_activelist; 260 struct list_head hugepage_freelists[MAX_NUMNODES]; 261 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 262 unsigned int free_huge_pages_node[MAX_NUMNODES]; 263 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 264 #ifdef CONFIG_CGROUP_HUGETLB 265 /* cgroup control files */ 266 struct cftype cgroup_files[5]; 267 #endif 268 char name[HSTATE_NAME_LEN]; 269 }; 270 271 struct huge_bootmem_page { 272 struct list_head list; 273 struct hstate *hstate; 274 #ifdef CONFIG_HIGHMEM 275 phys_addr_t phys; 276 #endif 277 }; 278 279 struct page *alloc_huge_page_node(struct hstate *h, int nid); 280 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma, 281 unsigned long addr, int avoid_reserve); 282 283 /* arch callback */ 284 int __init alloc_bootmem_huge_page(struct hstate *h); 285 286 void __init hugetlb_add_hstate(unsigned order); 287 struct hstate *size_to_hstate(unsigned long size); 288 289 #ifndef HUGE_MAX_HSTATE 290 #define HUGE_MAX_HSTATE 1 291 #endif 292 293 extern struct hstate hstates[HUGE_MAX_HSTATE]; 294 extern unsigned int default_hstate_idx; 295 296 #define default_hstate (hstates[default_hstate_idx]) 297 298 static inline struct hstate *hstate_inode(struct inode *i) 299 { 300 struct hugetlbfs_sb_info *hsb; 301 hsb = HUGETLBFS_SB(i->i_sb); 302 return hsb->hstate; 303 } 304 305 static inline struct hstate *hstate_file(struct file *f) 306 { 307 return hstate_inode(file_inode(f)); 308 } 309 310 static inline struct hstate *hstate_sizelog(int page_size_log) 311 { 312 if (!page_size_log) 313 return &default_hstate; 314 return size_to_hstate(1 << page_size_log); 315 } 316 317 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 318 { 319 return hstate_file(vma->vm_file); 320 } 321 322 static inline unsigned long huge_page_size(struct hstate *h) 323 { 324 return (unsigned long)PAGE_SIZE << h->order; 325 } 326 327 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 328 329 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 330 331 static inline unsigned long huge_page_mask(struct hstate *h) 332 { 333 return h->mask; 334 } 335 336 static inline unsigned int huge_page_order(struct hstate *h) 337 { 338 return h->order; 339 } 340 341 static inline unsigned huge_page_shift(struct hstate *h) 342 { 343 return h->order + PAGE_SHIFT; 344 } 345 346 static inline unsigned int pages_per_huge_page(struct hstate *h) 347 { 348 return 1 << h->order; 349 } 350 351 static inline unsigned int blocks_per_huge_page(struct hstate *h) 352 { 353 return huge_page_size(h) / 512; 354 } 355 356 #include <asm/hugetlb.h> 357 358 #ifndef arch_make_huge_pte 359 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma, 360 struct page *page, int writable) 361 { 362 return entry; 363 } 364 #endif 365 366 static inline struct hstate *page_hstate(struct page *page) 367 { 368 VM_BUG_ON_PAGE(!PageHuge(page), page); 369 return size_to_hstate(PAGE_SIZE << compound_order(page)); 370 } 371 372 static inline unsigned hstate_index_to_shift(unsigned index) 373 { 374 return hstates[index].order + PAGE_SHIFT; 375 } 376 377 static inline int hstate_index(struct hstate *h) 378 { 379 return h - hstates; 380 } 381 382 pgoff_t __basepage_index(struct page *page); 383 384 /* Return page->index in PAGE_SIZE units */ 385 static inline pgoff_t basepage_index(struct page *page) 386 { 387 if (!PageCompound(page)) 388 return page->index; 389 390 return __basepage_index(page); 391 } 392 393 extern void dissolve_free_huge_pages(unsigned long start_pfn, 394 unsigned long end_pfn); 395 int pmd_huge_support(void); 396 /* 397 * Currently hugepage migration is enabled only for pmd-based hugepage. 398 * This function will be updated when hugepage migration is more widely 399 * supported. 400 */ 401 static inline int hugepage_migration_support(struct hstate *h) 402 { 403 return pmd_huge_support() && (huge_page_shift(h) == PMD_SHIFT); 404 } 405 406 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 407 struct mm_struct *mm, pte_t *pte) 408 { 409 if (huge_page_size(h) == PMD_SIZE) 410 return pmd_lockptr(mm, (pmd_t *) pte); 411 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE); 412 return &mm->page_table_lock; 413 } 414 415 #else /* CONFIG_HUGETLB_PAGE */ 416 struct hstate {}; 417 #define alloc_huge_page_node(h, nid) NULL 418 #define alloc_huge_page_noerr(v, a, r) NULL 419 #define alloc_bootmem_huge_page(h) NULL 420 #define hstate_file(f) NULL 421 #define hstate_sizelog(s) NULL 422 #define hstate_vma(v) NULL 423 #define hstate_inode(i) NULL 424 #define page_hstate(page) NULL 425 #define huge_page_size(h) PAGE_SIZE 426 #define huge_page_mask(h) PAGE_MASK 427 #define vma_kernel_pagesize(v) PAGE_SIZE 428 #define vma_mmu_pagesize(v) PAGE_SIZE 429 #define huge_page_order(h) 0 430 #define huge_page_shift(h) PAGE_SHIFT 431 static inline unsigned int pages_per_huge_page(struct hstate *h) 432 { 433 return 1; 434 } 435 #define hstate_index_to_shift(index) 0 436 #define hstate_index(h) 0 437 438 static inline pgoff_t basepage_index(struct page *page) 439 { 440 return page->index; 441 } 442 #define dissolve_free_huge_pages(s, e) do {} while (0) 443 #define pmd_huge_support() 0 444 #define hugepage_migration_support(h) 0 445 446 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 447 struct mm_struct *mm, pte_t *pte) 448 { 449 return &mm->page_table_lock; 450 } 451 #endif /* CONFIG_HUGETLB_PAGE */ 452 453 static inline spinlock_t *huge_pte_lock(struct hstate *h, 454 struct mm_struct *mm, pte_t *pte) 455 { 456 spinlock_t *ptl; 457 458 ptl = huge_pte_lockptr(h, mm, pte); 459 spin_lock(ptl); 460 return ptl; 461 } 462 463 #endif /* _LINUX_HUGETLB_H */ 464