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 12struct ctl_table; 13struct user_struct; 14struct 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 22struct 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 34struct resv_map { 35 struct kref refs; 36 spinlock_t lock; 37 struct list_head regions; 38}; 39extern struct resv_map *resv_map_alloc(void); 40void resv_map_release(struct kref *ref); 41 42extern spinlock_t hugetlb_lock; 43extern int hugetlb_max_hstate __read_mostly; 44#define for_each_hstate(h) \ 45 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++) 46 47struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages, 48 long min_hpages); 49void hugepage_put_subpool(struct hugepage_subpool *spool); 50 51void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 52int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 53int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 54int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 55 56#ifdef CONFIG_NUMA 57int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, 58 void __user *, size_t *, loff_t *); 59#endif 60 61int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 62long 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); 65void unmap_hugepage_range(struct vm_area_struct *, 66 unsigned long, unsigned long, struct page *); 67void __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); 71void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, 72 unsigned long start, unsigned long end, 73 struct page *ref_page); 74void hugetlb_report_meminfo(struct seq_file *); 75int hugetlb_report_node_meminfo(int, char *); 76void hugetlb_show_meminfo(void); 77unsigned long hugetlb_total_pages(void); 78int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 79 unsigned long address, unsigned int flags); 80int hugetlb_reserve_pages(struct inode *inode, long from, long to, 81 struct vm_area_struct *vma, 82 vm_flags_t vm_flags); 83void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 84int dequeue_hwpoisoned_huge_page(struct page *page); 85bool isolate_huge_page(struct page *page, struct list_head *list); 86void putback_active_hugepage(struct page *page); 87void free_huge_page(struct page *page); 88 89#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE 90pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud); 91#endif 92 93extern int hugepages_treat_as_movable; 94extern int sysctl_hugetlb_shm_group; 95extern struct list_head huge_boot_pages; 96 97/* arch callbacks */ 98 99pte_t *huge_pte_alloc(struct mm_struct *mm, 100 unsigned long addr, unsigned long sz); 101pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 102int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 103struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 104 int write); 105struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 106 pmd_t *pmd, int flags); 107struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 108 pud_t *pud, int flags); 109int pmd_huge(pmd_t pmd); 110int pud_huge(pud_t pmd); 111unsigned 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 116static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 117{ 118} 119 120static 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; }) 128static inline void hugetlb_report_meminfo(struct seq_file *m) 129{ 130} 131#define hugetlb_report_node_meminfo(n, buf) 0 132static 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 144static inline int dequeue_hwpoisoned_huge_page(struct page *page) 145{ 146 return 0; 147} 148 149static 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 155static 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 161static 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 168static 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 185static inline int pgd_write(pgd_t pgd) 186{ 187 BUG(); 188 return 0; 189} 190#endif 191 192#ifndef pud_write 193static 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 */ 208typedef struct { unsigned long pd; } hugepd_t; 209#define is_hugepd(hugepd) (0) 210#define __hugepd(x) ((hugepd_t) { (x) }) 211static 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 218extern 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 225enum { 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 239struct 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 247static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 248{ 249 return sb->s_fs_info; 250} 251 252extern const struct file_operations hugetlbfs_file_operations; 253extern const struct vm_operations_struct hugetlb_vm_ops; 254struct 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 258static 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 272static inline struct file * 273hugetlb_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 283unsigned 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 */ 292struct 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 315struct 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 323struct page *alloc_huge_page_node(struct hstate *h, int nid); 324struct page *alloc_huge_page_noerr(struct vm_area_struct *vma, 325 unsigned long addr, int avoid_reserve); 326 327/* arch callback */ 328int __init alloc_bootmem_huge_page(struct hstate *h); 329 330void __init hugetlb_add_hstate(unsigned order); 331struct hstate *size_to_hstate(unsigned long size); 332 333#ifndef HUGE_MAX_HSTATE 334#define HUGE_MAX_HSTATE 1 335#endif 336 337extern struct hstate hstates[HUGE_MAX_HSTATE]; 338extern unsigned int default_hstate_idx; 339 340#define default_hstate (hstates[default_hstate_idx]) 341 342static 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 349static inline struct hstate *hstate_file(struct file *f) 350{ 351 return hstate_inode(file_inode(f)); 352} 353 354static 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 362static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 363{ 364 return hstate_file(vma->vm_file); 365} 366 367static inline unsigned long huge_page_size(struct hstate *h) 368{ 369 return (unsigned long)PAGE_SIZE << h->order; 370} 371 372extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 373 374extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 375 376static inline unsigned long huge_page_mask(struct hstate *h) 377{ 378 return h->mask; 379} 380 381static inline unsigned int huge_page_order(struct hstate *h) 382{ 383 return h->order; 384} 385 386static inline unsigned huge_page_shift(struct hstate *h) 387{ 388 return h->order + PAGE_SHIFT; 389} 390 391static inline bool hstate_is_gigantic(struct hstate *h) 392{ 393 return huge_page_order(h) >= MAX_ORDER; 394} 395 396static inline unsigned int pages_per_huge_page(struct hstate *h) 397{ 398 return 1 << h->order; 399} 400 401static 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 409static 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 416static 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 422static inline unsigned hstate_index_to_shift(unsigned index) 423{ 424 return hstates[index].order + PAGE_SHIFT; 425} 426 427static inline int hstate_index(struct hstate *h) 428{ 429 return h - hstates; 430} 431 432pgoff_t __basepage_index(struct page *page); 433 434/* Return page->index in PAGE_SIZE units */ 435static 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 443extern void dissolve_free_huge_pages(unsigned long start_pfn, 444 unsigned long end_pfn); 445static 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 454static 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#ifndef hugepages_supported 464/* 465 * Some platform decide whether they support huge pages at boot 466 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0 467 * when there is no such support 468 */ 469#define hugepages_supported() (HPAGE_SHIFT != 0) 470#endif 471 472#else /* CONFIG_HUGETLB_PAGE */ 473struct hstate {}; 474#define alloc_huge_page_node(h, nid) NULL 475#define alloc_huge_page_noerr(v, a, r) NULL 476#define alloc_bootmem_huge_page(h) NULL 477#define hstate_file(f) NULL 478#define hstate_sizelog(s) NULL 479#define hstate_vma(v) NULL 480#define hstate_inode(i) NULL 481#define page_hstate(page) NULL 482#define huge_page_size(h) PAGE_SIZE 483#define huge_page_mask(h) PAGE_MASK 484#define vma_kernel_pagesize(v) PAGE_SIZE 485#define vma_mmu_pagesize(v) PAGE_SIZE 486#define huge_page_order(h) 0 487#define huge_page_shift(h) PAGE_SHIFT 488static inline unsigned int pages_per_huge_page(struct hstate *h) 489{ 490 return 1; 491} 492#define hstate_index_to_shift(index) 0 493#define hstate_index(h) 0 494 495static inline pgoff_t basepage_index(struct page *page) 496{ 497 return page->index; 498} 499#define dissolve_free_huge_pages(s, e) do {} while (0) 500#define hugepage_migration_supported(h) 0 501 502static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 503 struct mm_struct *mm, pte_t *pte) 504{ 505 return &mm->page_table_lock; 506} 507#endif /* CONFIG_HUGETLB_PAGE */ 508 509static inline spinlock_t *huge_pte_lock(struct hstate *h, 510 struct mm_struct *mm, pte_t *pte) 511{ 512 spinlock_t *ptl; 513 514 ptl = huge_pte_lockptr(h, mm, pte); 515 spin_lock(ptl); 516 return ptl; 517} 518 519#endif /* _LINUX_HUGETLB_H */ 520