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; /* Maximum huge pages or -1 if no maximum. */ 26 long used_hpages; /* Used count against maximum, includes */ 27 /* both alloced and reserved pages. */ 28 struct hstate *hstate; 29 long min_hpages; /* Minimum huge pages or -1 if no minimum. */ 30 long rsv_hpages; /* Pages reserved against global pool to */ 31 /* sasitfy minimum size. */ 32 }; 33 34 struct resv_map { 35 struct kref refs; 36 spinlock_t lock; 37 struct list_head regions; 38 long adds_in_progress; 39 struct list_head region_cache; 40 long region_cache_count; 41 }; 42 extern struct resv_map *resv_map_alloc(void); 43 void resv_map_release(struct kref *ref); 44 45 extern spinlock_t hugetlb_lock; 46 extern int hugetlb_max_hstate __read_mostly; 47 #define for_each_hstate(h) \ 48 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++) 49 50 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages, 51 long min_hpages); 52 void hugepage_put_subpool(struct hugepage_subpool *spool); 53 54 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 55 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 56 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 57 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 58 59 #ifdef CONFIG_NUMA 60 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, 61 void __user *, size_t *, loff_t *); 62 #endif 63 64 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 65 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 66 struct page **, struct vm_area_struct **, 67 unsigned long *, unsigned long *, long, unsigned int); 68 void unmap_hugepage_range(struct vm_area_struct *, 69 unsigned long, unsigned long, struct page *); 70 void __unmap_hugepage_range_final(struct mmu_gather *tlb, 71 struct vm_area_struct *vma, 72 unsigned long start, unsigned long end, 73 struct page *ref_page); 74 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, 75 unsigned long start, unsigned long end, 76 struct page *ref_page); 77 void hugetlb_report_meminfo(struct seq_file *); 78 int hugetlb_report_node_meminfo(int, char *); 79 void hugetlb_show_meminfo(void); 80 unsigned long hugetlb_total_pages(void); 81 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 82 unsigned long address, unsigned int flags); 83 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 84 struct vm_area_struct *vma, 85 vm_flags_t vm_flags); 86 long hugetlb_unreserve_pages(struct inode *inode, long start, long end, 87 long freed); 88 int dequeue_hwpoisoned_huge_page(struct page *page); 89 bool isolate_huge_page(struct page *page, struct list_head *list); 90 void putback_active_hugepage(struct page *page); 91 void free_huge_page(struct page *page); 92 void hugetlb_fix_reserve_counts(struct inode *inode, bool restore_reserve); 93 extern struct mutex *hugetlb_fault_mutex_table; 94 u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm, 95 struct vm_area_struct *vma, 96 struct address_space *mapping, 97 pgoff_t idx, unsigned long address); 98 99 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE 100 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud); 101 #endif 102 103 extern int hugepages_treat_as_movable; 104 extern int sysctl_hugetlb_shm_group; 105 extern struct list_head huge_boot_pages; 106 107 /* arch callbacks */ 108 109 pte_t *huge_pte_alloc(struct mm_struct *mm, 110 unsigned long addr, unsigned long sz); 111 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 112 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 113 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 114 int write); 115 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 116 pmd_t *pmd, int flags); 117 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 118 pud_t *pud, int flags); 119 int pmd_huge(pmd_t pmd); 120 int pud_huge(pud_t pmd); 121 unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 122 unsigned long address, unsigned long end, pgprot_t newprot); 123 124 #else /* !CONFIG_HUGETLB_PAGE */ 125 126 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 127 { 128 } 129 130 static inline unsigned long hugetlb_total_pages(void) 131 { 132 return 0; 133 } 134 135 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 136 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 137 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 138 static inline void hugetlb_report_meminfo(struct seq_file *m) 139 { 140 } 141 #define hugetlb_report_node_meminfo(n, buf) 0 142 static inline void hugetlb_show_meminfo(void) 143 { 144 } 145 #define follow_huge_pmd(mm, addr, pmd, flags) NULL 146 #define follow_huge_pud(mm, addr, pud, flags) NULL 147 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 148 #define pmd_huge(x) 0 149 #define pud_huge(x) 0 150 #define is_hugepage_only_range(mm, addr, len) 0 151 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 152 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 153 #define huge_pte_offset(mm, address) 0 154 static inline int dequeue_hwpoisoned_huge_page(struct page *page) 155 { 156 return 0; 157 } 158 159 static inline bool isolate_huge_page(struct page *page, struct list_head *list) 160 { 161 return false; 162 } 163 #define putback_active_hugepage(p) do {} while (0) 164 165 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 166 unsigned long address, unsigned long end, pgprot_t newprot) 167 { 168 return 0; 169 } 170 171 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb, 172 struct vm_area_struct *vma, unsigned long start, 173 unsigned long end, struct page *ref_page) 174 { 175 BUG(); 176 } 177 178 static inline void __unmap_hugepage_range(struct mmu_gather *tlb, 179 struct vm_area_struct *vma, unsigned long start, 180 unsigned long end, struct page *ref_page) 181 { 182 BUG(); 183 } 184 185 #endif /* !CONFIG_HUGETLB_PAGE */ 186 /* 187 * hugepages at page global directory. If arch support 188 * hugepages at pgd level, they need to define this. 189 */ 190 #ifndef pgd_huge 191 #define pgd_huge(x) 0 192 #endif 193 194 #ifndef pgd_write 195 static inline int pgd_write(pgd_t pgd) 196 { 197 BUG(); 198 return 0; 199 } 200 #endif 201 202 #ifndef pud_write 203 static inline int pud_write(pud_t pud) 204 { 205 BUG(); 206 return 0; 207 } 208 #endif 209 210 #ifndef is_hugepd 211 /* 212 * Some architectures requires a hugepage directory format that is 213 * required to support multiple hugepage sizes. For example 214 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables" 215 * introduced the same on powerpc. This allows for a more flexible hugepage 216 * pagetable layout. 217 */ 218 typedef struct { unsigned long pd; } hugepd_t; 219 #define is_hugepd(hugepd) (0) 220 #define __hugepd(x) ((hugepd_t) { (x) }) 221 static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr, 222 unsigned pdshift, unsigned long end, 223 int write, struct page **pages, int *nr) 224 { 225 return 0; 226 } 227 #else 228 extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr, 229 unsigned pdshift, unsigned long end, 230 int write, struct page **pages, int *nr); 231 #endif 232 233 #define HUGETLB_ANON_FILE "anon_hugepage" 234 235 enum { 236 /* 237 * The file will be used as an shm file so shmfs accounting rules 238 * apply 239 */ 240 HUGETLB_SHMFS_INODE = 1, 241 /* 242 * The file is being created on the internal vfs mount and shmfs 243 * accounting rules do not apply 244 */ 245 HUGETLB_ANONHUGE_INODE = 2, 246 }; 247 248 #ifdef CONFIG_HUGETLBFS 249 struct hugetlbfs_sb_info { 250 long max_inodes; /* inodes allowed */ 251 long free_inodes; /* inodes free */ 252 spinlock_t stat_lock; 253 struct hstate *hstate; 254 struct hugepage_subpool *spool; 255 }; 256 257 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 258 { 259 return sb->s_fs_info; 260 } 261 262 extern const struct file_operations hugetlbfs_file_operations; 263 extern const struct vm_operations_struct hugetlb_vm_ops; 264 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct, 265 struct user_struct **user, int creat_flags, 266 int page_size_log); 267 268 static inline int is_file_hugepages(struct file *file) 269 { 270 if (file->f_op == &hugetlbfs_file_operations) 271 return 1; 272 if (is_file_shm_hugepages(file)) 273 return 1; 274 275 return 0; 276 } 277 278 279 #else /* !CONFIG_HUGETLBFS */ 280 281 #define is_file_hugepages(file) 0 282 static inline struct file * 283 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag, 284 struct user_struct **user, int creat_flags, 285 int page_size_log) 286 { 287 return ERR_PTR(-ENOSYS); 288 } 289 290 #endif /* !CONFIG_HUGETLBFS */ 291 292 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 293 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 294 unsigned long len, unsigned long pgoff, 295 unsigned long flags); 296 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 297 298 #ifdef CONFIG_HUGETLB_PAGE 299 300 #define HSTATE_NAME_LEN 32 301 /* Defines one hugetlb page size */ 302 struct hstate { 303 int next_nid_to_alloc; 304 int next_nid_to_free; 305 unsigned int order; 306 unsigned long mask; 307 unsigned long max_huge_pages; 308 unsigned long nr_huge_pages; 309 unsigned long free_huge_pages; 310 unsigned long resv_huge_pages; 311 unsigned long surplus_huge_pages; 312 unsigned long nr_overcommit_huge_pages; 313 struct list_head hugepage_activelist; 314 struct list_head hugepage_freelists[MAX_NUMNODES]; 315 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 316 unsigned int free_huge_pages_node[MAX_NUMNODES]; 317 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 318 #ifdef CONFIG_CGROUP_HUGETLB 319 /* cgroup control files */ 320 struct cftype cgroup_files[5]; 321 #endif 322 char name[HSTATE_NAME_LEN]; 323 }; 324 325 struct huge_bootmem_page { 326 struct list_head list; 327 struct hstate *hstate; 328 #ifdef CONFIG_HIGHMEM 329 phys_addr_t phys; 330 #endif 331 }; 332 333 struct page *alloc_huge_page(struct vm_area_struct *vma, 334 unsigned long addr, int avoid_reserve); 335 struct page *alloc_huge_page_node(struct hstate *h, int nid); 336 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma, 337 unsigned long addr, int avoid_reserve); 338 int huge_add_to_page_cache(struct page *page, struct address_space *mapping, 339 pgoff_t idx); 340 341 /* arch callback */ 342 int __init alloc_bootmem_huge_page(struct hstate *h); 343 344 void __init hugetlb_add_hstate(unsigned order); 345 struct hstate *size_to_hstate(unsigned long size); 346 347 #ifndef HUGE_MAX_HSTATE 348 #define HUGE_MAX_HSTATE 1 349 #endif 350 351 extern struct hstate hstates[HUGE_MAX_HSTATE]; 352 extern unsigned int default_hstate_idx; 353 354 #define default_hstate (hstates[default_hstate_idx]) 355 356 static inline struct hstate *hstate_inode(struct inode *i) 357 { 358 struct hugetlbfs_sb_info *hsb; 359 hsb = HUGETLBFS_SB(i->i_sb); 360 return hsb->hstate; 361 } 362 363 static inline struct hstate *hstate_file(struct file *f) 364 { 365 return hstate_inode(file_inode(f)); 366 } 367 368 static inline struct hstate *hstate_sizelog(int page_size_log) 369 { 370 if (!page_size_log) 371 return &default_hstate; 372 373 return size_to_hstate(1UL << page_size_log); 374 } 375 376 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 377 { 378 return hstate_file(vma->vm_file); 379 } 380 381 static inline unsigned long huge_page_size(struct hstate *h) 382 { 383 return (unsigned long)PAGE_SIZE << h->order; 384 } 385 386 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 387 388 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 389 390 static inline unsigned long huge_page_mask(struct hstate *h) 391 { 392 return h->mask; 393 } 394 395 static inline unsigned int huge_page_order(struct hstate *h) 396 { 397 return h->order; 398 } 399 400 static inline unsigned huge_page_shift(struct hstate *h) 401 { 402 return h->order + PAGE_SHIFT; 403 } 404 405 static inline bool hstate_is_gigantic(struct hstate *h) 406 { 407 return huge_page_order(h) >= MAX_ORDER; 408 } 409 410 static inline unsigned int pages_per_huge_page(struct hstate *h) 411 { 412 return 1 << h->order; 413 } 414 415 static inline unsigned int blocks_per_huge_page(struct hstate *h) 416 { 417 return huge_page_size(h) / 512; 418 } 419 420 #include <asm/hugetlb.h> 421 422 #ifndef arch_make_huge_pte 423 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma, 424 struct page *page, int writable) 425 { 426 return entry; 427 } 428 #endif 429 430 static inline struct hstate *page_hstate(struct page *page) 431 { 432 VM_BUG_ON_PAGE(!PageHuge(page), page); 433 return size_to_hstate(PAGE_SIZE << compound_order(page)); 434 } 435 436 static inline unsigned hstate_index_to_shift(unsigned index) 437 { 438 return hstates[index].order + PAGE_SHIFT; 439 } 440 441 static inline int hstate_index(struct hstate *h) 442 { 443 return h - hstates; 444 } 445 446 pgoff_t __basepage_index(struct page *page); 447 448 /* Return page->index in PAGE_SIZE units */ 449 static inline pgoff_t basepage_index(struct page *page) 450 { 451 if (!PageCompound(page)) 452 return page->index; 453 454 return __basepage_index(page); 455 } 456 457 extern void dissolve_free_huge_pages(unsigned long start_pfn, 458 unsigned long end_pfn); 459 static inline int hugepage_migration_supported(struct hstate *h) 460 { 461 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION 462 return huge_page_shift(h) == PMD_SHIFT; 463 #else 464 return 0; 465 #endif 466 } 467 468 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 469 struct mm_struct *mm, pte_t *pte) 470 { 471 if (huge_page_size(h) == PMD_SIZE) 472 return pmd_lockptr(mm, (pmd_t *) pte); 473 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE); 474 return &mm->page_table_lock; 475 } 476 477 #ifndef hugepages_supported 478 /* 479 * Some platform decide whether they support huge pages at boot 480 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0 481 * when there is no such support 482 */ 483 #define hugepages_supported() (HPAGE_SHIFT != 0) 484 #endif 485 486 #else /* CONFIG_HUGETLB_PAGE */ 487 struct hstate {}; 488 #define alloc_huge_page(v, a, r) NULL 489 #define alloc_huge_page_node(h, nid) NULL 490 #define alloc_huge_page_noerr(v, a, r) NULL 491 #define alloc_bootmem_huge_page(h) NULL 492 #define hstate_file(f) NULL 493 #define hstate_sizelog(s) NULL 494 #define hstate_vma(v) NULL 495 #define hstate_inode(i) NULL 496 #define page_hstate(page) NULL 497 #define huge_page_size(h) PAGE_SIZE 498 #define huge_page_mask(h) PAGE_MASK 499 #define vma_kernel_pagesize(v) PAGE_SIZE 500 #define vma_mmu_pagesize(v) PAGE_SIZE 501 #define huge_page_order(h) 0 502 #define huge_page_shift(h) PAGE_SHIFT 503 static inline unsigned int pages_per_huge_page(struct hstate *h) 504 { 505 return 1; 506 } 507 #define hstate_index_to_shift(index) 0 508 #define hstate_index(h) 0 509 510 static inline pgoff_t basepage_index(struct page *page) 511 { 512 return page->index; 513 } 514 #define dissolve_free_huge_pages(s, e) do {} while (0) 515 #define hugepage_migration_supported(h) 0 516 517 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 518 struct mm_struct *mm, pte_t *pte) 519 { 520 return &mm->page_table_lock; 521 } 522 #endif /* CONFIG_HUGETLB_PAGE */ 523 524 static inline spinlock_t *huge_pte_lock(struct hstate *h, 525 struct mm_struct *mm, pte_t *pte) 526 { 527 spinlock_t *ptl; 528 529 ptl = huge_pte_lockptr(h, mm, pte); 530 spin_lock(ptl); 531 return ptl; 532 } 533 534 #endif /* _LINUX_HUGETLB_H */ 535