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 #include <asm/pgtable.h> 12 13 struct ctl_table; 14 struct user_struct; 15 struct mmu_gather; 16 17 #ifdef CONFIG_HUGETLB_PAGE 18 19 #include <linux/mempolicy.h> 20 #include <linux/shm.h> 21 #include <asm/tlbflush.h> 22 23 struct hugepage_subpool { 24 spinlock_t lock; 25 long count; 26 long max_hpages; /* Maximum huge pages or -1 if no maximum. */ 27 long used_hpages; /* Used count against maximum, includes */ 28 /* both alloced and reserved pages. */ 29 struct hstate *hstate; 30 long min_hpages; /* Minimum huge pages or -1 if no minimum. */ 31 long rsv_hpages; /* Pages reserved against global pool to */ 32 /* sasitfy minimum size. */ 33 }; 34 35 struct resv_map { 36 struct kref refs; 37 spinlock_t lock; 38 struct list_head regions; 39 long adds_in_progress; 40 struct list_head region_cache; 41 long region_cache_count; 42 }; 43 extern struct resv_map *resv_map_alloc(void); 44 void resv_map_release(struct kref *ref); 45 46 extern spinlock_t hugetlb_lock; 47 extern int hugetlb_max_hstate __read_mostly; 48 #define for_each_hstate(h) \ 49 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++) 50 51 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages, 52 long min_hpages); 53 void hugepage_put_subpool(struct hugepage_subpool *spool); 54 55 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 56 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 57 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 58 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 59 60 #ifdef CONFIG_NUMA 61 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, 62 void __user *, size_t *, loff_t *); 63 #endif 64 65 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 66 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 67 struct page **, struct vm_area_struct **, 68 unsigned long *, unsigned long *, long, unsigned int); 69 void unmap_hugepage_range(struct vm_area_struct *, 70 unsigned long, unsigned long, struct page *); 71 void __unmap_hugepage_range_final(struct mmu_gather *tlb, 72 struct vm_area_struct *vma, 73 unsigned long start, unsigned long end, 74 struct page *ref_page); 75 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, 76 unsigned long start, unsigned long end, 77 struct page *ref_page); 78 void hugetlb_report_meminfo(struct seq_file *); 79 int hugetlb_report_node_meminfo(int, char *); 80 void hugetlb_show_meminfo(void); 81 unsigned long hugetlb_total_pages(void); 82 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 83 unsigned long address, unsigned int flags); 84 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 85 struct vm_area_struct *vma, 86 vm_flags_t vm_flags); 87 long hugetlb_unreserve_pages(struct inode *inode, long start, long end, 88 long freed); 89 int dequeue_hwpoisoned_huge_page(struct page *page); 90 bool isolate_huge_page(struct page *page, struct list_head *list); 91 void putback_active_hugepage(struct page *page); 92 void free_huge_page(struct page *page); 93 void hugetlb_fix_reserve_counts(struct inode *inode, bool restore_reserve); 94 extern struct mutex *hugetlb_fault_mutex_table; 95 u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm, 96 struct vm_area_struct *vma, 97 struct address_space *mapping, 98 pgoff_t idx, unsigned long address); 99 100 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud); 101 102 extern int hugepages_treat_as_movable; 103 extern int sysctl_hugetlb_shm_group; 104 extern struct list_head huge_boot_pages; 105 106 /* arch callbacks */ 107 108 pte_t *huge_pte_alloc(struct mm_struct *mm, 109 unsigned long addr, unsigned long sz); 110 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 111 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 112 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 113 int write); 114 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 115 pmd_t *pmd, int flags); 116 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 117 pud_t *pud, int flags); 118 int pmd_huge(pmd_t pmd); 119 int pud_huge(pud_t pmd); 120 unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 121 unsigned long address, unsigned long end, pgprot_t newprot); 122 123 #else /* !CONFIG_HUGETLB_PAGE */ 124 125 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 126 { 127 } 128 129 static inline unsigned long hugetlb_total_pages(void) 130 { 131 return 0; 132 } 133 134 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 135 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 136 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 137 static inline void hugetlb_report_meminfo(struct seq_file *m) 138 { 139 } 140 #define hugetlb_report_node_meminfo(n, buf) 0 141 static inline void hugetlb_show_meminfo(void) 142 { 143 } 144 #define follow_huge_pmd(mm, addr, pmd, flags) NULL 145 #define follow_huge_pud(mm, addr, pud, flags) NULL 146 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 147 #define pmd_huge(x) 0 148 #define pud_huge(x) 0 149 #define is_hugepage_only_range(mm, addr, len) 0 150 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 151 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 152 #define huge_pte_offset(mm, address) 0 153 static inline int dequeue_hwpoisoned_huge_page(struct page *page) 154 { 155 return 0; 156 } 157 158 static inline bool isolate_huge_page(struct page *page, struct list_head *list) 159 { 160 return false; 161 } 162 #define putback_active_hugepage(p) do {} while (0) 163 164 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 165 unsigned long address, unsigned long end, pgprot_t newprot) 166 { 167 return 0; 168 } 169 170 static inline void __unmap_hugepage_range_final(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 static inline void __unmap_hugepage_range(struct mmu_gather *tlb, 178 struct vm_area_struct *vma, unsigned long start, 179 unsigned long end, struct page *ref_page) 180 { 181 BUG(); 182 } 183 184 #endif /* !CONFIG_HUGETLB_PAGE */ 185 /* 186 * hugepages at page global directory. If arch support 187 * hugepages at pgd level, they need to define this. 188 */ 189 #ifndef pgd_huge 190 #define pgd_huge(x) 0 191 #endif 192 193 #ifndef pgd_write 194 static inline int pgd_write(pgd_t pgd) 195 { 196 BUG(); 197 return 0; 198 } 199 #endif 200 201 #ifndef pud_write 202 static inline int pud_write(pud_t pud) 203 { 204 BUG(); 205 return 0; 206 } 207 #endif 208 209 #ifndef is_hugepd 210 /* 211 * Some architectures requires a hugepage directory format that is 212 * required to support multiple hugepage sizes. For example 213 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables" 214 * introduced the same on powerpc. This allows for a more flexible hugepage 215 * pagetable layout. 216 */ 217 typedef struct { unsigned long pd; } hugepd_t; 218 #define is_hugepd(hugepd) (0) 219 #define __hugepd(x) ((hugepd_t) { (x) }) 220 static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr, 221 unsigned pdshift, unsigned long end, 222 int write, struct page **pages, int *nr) 223 { 224 return 0; 225 } 226 #else 227 extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr, 228 unsigned pdshift, unsigned long end, 229 int write, struct page **pages, int *nr); 230 #endif 231 232 #define HUGETLB_ANON_FILE "anon_hugepage" 233 234 enum { 235 /* 236 * The file will be used as an shm file so shmfs accounting rules 237 * apply 238 */ 239 HUGETLB_SHMFS_INODE = 1, 240 /* 241 * The file is being created on the internal vfs mount and shmfs 242 * accounting rules do not apply 243 */ 244 HUGETLB_ANONHUGE_INODE = 2, 245 }; 246 247 #ifdef CONFIG_HUGETLBFS 248 struct hugetlbfs_sb_info { 249 long max_inodes; /* inodes allowed */ 250 long free_inodes; /* inodes free */ 251 spinlock_t stat_lock; 252 struct hstate *hstate; 253 struct hugepage_subpool *spool; 254 }; 255 256 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 257 { 258 return sb->s_fs_info; 259 } 260 261 extern const struct file_operations hugetlbfs_file_operations; 262 extern const struct vm_operations_struct hugetlb_vm_ops; 263 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct, 264 struct user_struct **user, int creat_flags, 265 int page_size_log); 266 267 static inline bool is_file_hugepages(struct file *file) 268 { 269 if (file->f_op == &hugetlbfs_file_operations) 270 return true; 271 272 return is_file_shm_hugepages(file); 273 } 274 275 276 #else /* !CONFIG_HUGETLBFS */ 277 278 #define is_file_hugepages(file) false 279 static inline struct file * 280 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag, 281 struct user_struct **user, int creat_flags, 282 int page_size_log) 283 { 284 return ERR_PTR(-ENOSYS); 285 } 286 287 #endif /* !CONFIG_HUGETLBFS */ 288 289 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 290 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 291 unsigned long len, unsigned long pgoff, 292 unsigned long flags); 293 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 294 295 #ifdef CONFIG_HUGETLB_PAGE 296 297 #define HSTATE_NAME_LEN 32 298 /* Defines one hugetlb page size */ 299 struct hstate { 300 int next_nid_to_alloc; 301 int next_nid_to_free; 302 unsigned int order; 303 unsigned long mask; 304 unsigned long max_huge_pages; 305 unsigned long nr_huge_pages; 306 unsigned long free_huge_pages; 307 unsigned long resv_huge_pages; 308 unsigned long surplus_huge_pages; 309 unsigned long nr_overcommit_huge_pages; 310 struct list_head hugepage_activelist; 311 struct list_head hugepage_freelists[MAX_NUMNODES]; 312 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 313 unsigned int free_huge_pages_node[MAX_NUMNODES]; 314 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 315 #ifdef CONFIG_CGROUP_HUGETLB 316 /* cgroup control files */ 317 struct cftype cgroup_files[5]; 318 #endif 319 char name[HSTATE_NAME_LEN]; 320 }; 321 322 struct huge_bootmem_page { 323 struct list_head list; 324 struct hstate *hstate; 325 #ifdef CONFIG_HIGHMEM 326 phys_addr_t phys; 327 #endif 328 }; 329 330 struct page *alloc_huge_page(struct vm_area_struct *vma, 331 unsigned long addr, int avoid_reserve); 332 struct page *alloc_huge_page_node(struct hstate *h, int nid); 333 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma, 334 unsigned long addr, int avoid_reserve); 335 int huge_add_to_page_cache(struct page *page, struct address_space *mapping, 336 pgoff_t idx); 337 338 /* arch callback */ 339 int __init alloc_bootmem_huge_page(struct hstate *h); 340 341 void __init hugetlb_add_hstate(unsigned order); 342 struct hstate *size_to_hstate(unsigned long size); 343 344 #ifndef HUGE_MAX_HSTATE 345 #define HUGE_MAX_HSTATE 1 346 #endif 347 348 extern struct hstate hstates[HUGE_MAX_HSTATE]; 349 extern unsigned int default_hstate_idx; 350 351 #define default_hstate (hstates[default_hstate_idx]) 352 353 static inline struct hstate *hstate_inode(struct inode *i) 354 { 355 struct hugetlbfs_sb_info *hsb; 356 hsb = HUGETLBFS_SB(i->i_sb); 357 return hsb->hstate; 358 } 359 360 static inline struct hstate *hstate_file(struct file *f) 361 { 362 return hstate_inode(file_inode(f)); 363 } 364 365 static inline struct hstate *hstate_sizelog(int page_size_log) 366 { 367 if (!page_size_log) 368 return &default_hstate; 369 370 return size_to_hstate(1UL << page_size_log); 371 } 372 373 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 374 { 375 return hstate_file(vma->vm_file); 376 } 377 378 static inline unsigned long huge_page_size(struct hstate *h) 379 { 380 return (unsigned long)PAGE_SIZE << h->order; 381 } 382 383 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 384 385 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 386 387 static inline unsigned long huge_page_mask(struct hstate *h) 388 { 389 return h->mask; 390 } 391 392 static inline unsigned int huge_page_order(struct hstate *h) 393 { 394 return h->order; 395 } 396 397 static inline unsigned huge_page_shift(struct hstate *h) 398 { 399 return h->order + PAGE_SHIFT; 400 } 401 402 static inline bool hstate_is_gigantic(struct hstate *h) 403 { 404 return huge_page_order(h) >= MAX_ORDER; 405 } 406 407 static inline unsigned int pages_per_huge_page(struct hstate *h) 408 { 409 return 1 << h->order; 410 } 411 412 static inline unsigned int blocks_per_huge_page(struct hstate *h) 413 { 414 return huge_page_size(h) / 512; 415 } 416 417 #include <asm/hugetlb.h> 418 419 #ifndef arch_make_huge_pte 420 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma, 421 struct page *page, int writable) 422 { 423 return entry; 424 } 425 #endif 426 427 static inline struct hstate *page_hstate(struct page *page) 428 { 429 VM_BUG_ON_PAGE(!PageHuge(page), page); 430 return size_to_hstate(PAGE_SIZE << compound_order(page)); 431 } 432 433 static inline unsigned hstate_index_to_shift(unsigned index) 434 { 435 return hstates[index].order + PAGE_SHIFT; 436 } 437 438 static inline int hstate_index(struct hstate *h) 439 { 440 return h - hstates; 441 } 442 443 pgoff_t __basepage_index(struct page *page); 444 445 /* Return page->index in PAGE_SIZE units */ 446 static inline pgoff_t basepage_index(struct page *page) 447 { 448 if (!PageCompound(page)) 449 return page->index; 450 451 return __basepage_index(page); 452 } 453 454 extern void dissolve_free_huge_pages(unsigned long start_pfn, 455 unsigned long end_pfn); 456 static inline int hugepage_migration_supported(struct hstate *h) 457 { 458 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION 459 return huge_page_shift(h) == PMD_SHIFT; 460 #else 461 return 0; 462 #endif 463 } 464 465 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 466 struct mm_struct *mm, pte_t *pte) 467 { 468 if (huge_page_size(h) == PMD_SIZE) 469 return pmd_lockptr(mm, (pmd_t *) pte); 470 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE); 471 return &mm->page_table_lock; 472 } 473 474 #ifndef hugepages_supported 475 /* 476 * Some platform decide whether they support huge pages at boot 477 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0 478 * when there is no such support 479 */ 480 #define hugepages_supported() (HPAGE_SHIFT != 0) 481 #endif 482 483 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm); 484 485 static inline void hugetlb_count_add(long l, struct mm_struct *mm) 486 { 487 atomic_long_add(l, &mm->hugetlb_usage); 488 } 489 490 static inline void hugetlb_count_sub(long l, struct mm_struct *mm) 491 { 492 atomic_long_sub(l, &mm->hugetlb_usage); 493 } 494 #else /* CONFIG_HUGETLB_PAGE */ 495 struct hstate {}; 496 #define alloc_huge_page(v, a, r) NULL 497 #define alloc_huge_page_node(h, nid) NULL 498 #define alloc_huge_page_noerr(v, a, r) NULL 499 #define alloc_bootmem_huge_page(h) NULL 500 #define hstate_file(f) NULL 501 #define hstate_sizelog(s) NULL 502 #define hstate_vma(v) NULL 503 #define hstate_inode(i) NULL 504 #define page_hstate(page) NULL 505 #define huge_page_size(h) PAGE_SIZE 506 #define huge_page_mask(h) PAGE_MASK 507 #define vma_kernel_pagesize(v) PAGE_SIZE 508 #define vma_mmu_pagesize(v) PAGE_SIZE 509 #define huge_page_order(h) 0 510 #define huge_page_shift(h) PAGE_SHIFT 511 static inline unsigned int pages_per_huge_page(struct hstate *h) 512 { 513 return 1; 514 } 515 #define hstate_index_to_shift(index) 0 516 #define hstate_index(h) 0 517 518 static inline pgoff_t basepage_index(struct page *page) 519 { 520 return page->index; 521 } 522 #define dissolve_free_huge_pages(s, e) do {} while (0) 523 #define hugepage_migration_supported(h) 0 524 525 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 526 struct mm_struct *mm, pte_t *pte) 527 { 528 return &mm->page_table_lock; 529 } 530 531 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m) 532 { 533 } 534 535 static inline void hugetlb_count_sub(long l, struct mm_struct *mm) 536 { 537 } 538 #endif /* CONFIG_HUGETLB_PAGE */ 539 540 static inline spinlock_t *huge_pte_lock(struct hstate *h, 541 struct mm_struct *mm, pte_t *pte) 542 { 543 spinlock_t *ptl; 544 545 ptl = huge_pte_lockptr(h, mm, pte); 546 spin_lock(ptl); 547 return ptl; 548 } 549 550 #endif /* _LINUX_HUGETLB_H */ 551