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