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