1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #include <linux/mm_types.h>
5 #include <linux/mmdebug.h>
7 #include <linux/hugetlb_inline.h>
8 #include <linux/cgroup.h>
9 #include <linux/list.h>
10 #include <linux/kref.h>
16 #ifdef CONFIG_HUGETLB_PAGE
18 #include <linux/mempolicy.h>
19 #include <linux/shm.h>
20 #include <asm/tlbflush.h>
22 struct hugepage_subpool {
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. */
37 struct list_head regions;
39 extern struct resv_map *resv_map_alloc(void);
40 void resv_map_release(struct kref *ref);
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)++)
47 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
49 void hugepage_put_subpool(struct hugepage_subpool *spool);
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 *);
57 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
58 void __user *, size_t *, loff_t *);
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,
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);
89 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
90 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
93 extern int hugepages_treat_as_movable;
94 extern int sysctl_hugetlb_shm_group;
95 extern struct list_head huge_boot_pages;
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,
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);
114 #else /* !CONFIG_HUGETLB_PAGE */
116 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
120 static inline unsigned long hugetlb_total_pages(void)
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)
131 #define hugetlb_report_node_meminfo(n, buf) 0
132 static inline void hugetlb_show_meminfo(void)
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)
149 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
153 #define putback_active_hugepage(p) do {} while (0)
155 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
156 unsigned long address, unsigned long end, pgprot_t newprot)
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)
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)
175 #endif /* !CONFIG_HUGETLB_PAGE */
177 * hugepages at page global directory. If arch support
178 * hugepages at pgd level, they need to define this.
181 #define pgd_huge(x) 0
185 static inline int pgd_write(pgd_t pgd)
193 static inline int pud_write(pud_t pud)
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
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)
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);
223 #define HUGETLB_ANON_FILE "anon_hugepage"
227 * The file will be used as an shm file so shmfs accounting rules
230 HUGETLB_SHMFS_INODE = 1,
232 * The file is being created on the internal vfs mount and shmfs
233 * accounting rules do not apply
235 HUGETLB_ANONHUGE_INODE = 2,
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;
247 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
249 return sb->s_fs_info;
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,
258 static inline int is_file_hugepages(struct file *file)
260 if (file->f_op == &hugetlbfs_file_operations)
262 if (is_file_shm_hugepages(file))
269 #else /* !CONFIG_HUGETLBFS */
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,
277 return ERR_PTR(-ENOSYS);
280 #endif /* !CONFIG_HUGETLBFS */
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 */
288 #ifdef CONFIG_HUGETLB_PAGE
290 #define HSTATE_NAME_LEN 32
291 /* Defines one hugetlb page size */
293 int next_nid_to_alloc;
294 int next_nid_to_free;
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];
312 char name[HSTATE_NAME_LEN];
315 struct huge_bootmem_page {
316 struct list_head list;
317 struct hstate *hstate;
318 #ifdef CONFIG_HIGHMEM
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);
328 int __init alloc_bootmem_huge_page(struct hstate *h);
330 void __init hugetlb_add_hstate(unsigned order);
331 struct hstate *size_to_hstate(unsigned long size);
333 #ifndef HUGE_MAX_HSTATE
334 #define HUGE_MAX_HSTATE 1
337 extern struct hstate hstates[HUGE_MAX_HSTATE];
338 extern unsigned int default_hstate_idx;
340 #define default_hstate (hstates[default_hstate_idx])
342 static inline struct hstate *hstate_inode(struct inode *i)
344 struct hugetlbfs_sb_info *hsb;
345 hsb = HUGETLBFS_SB(i->i_sb);
349 static inline struct hstate *hstate_file(struct file *f)
351 return hstate_inode(file_inode(f));
354 static inline struct hstate *hstate_sizelog(int page_size_log)
357 return &default_hstate;
359 return size_to_hstate(1UL << page_size_log);
362 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
364 return hstate_file(vma->vm_file);
367 static inline unsigned long huge_page_size(struct hstate *h)
369 return (unsigned long)PAGE_SIZE << h->order;
372 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
374 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
376 static inline unsigned long huge_page_mask(struct hstate *h)
381 static inline unsigned int huge_page_order(struct hstate *h)
386 static inline unsigned huge_page_shift(struct hstate *h)
388 return h->order + PAGE_SHIFT;
391 static inline bool hstate_is_gigantic(struct hstate *h)
393 return huge_page_order(h) >= MAX_ORDER;
396 static inline unsigned int pages_per_huge_page(struct hstate *h)
398 return 1 << h->order;
401 static inline unsigned int blocks_per_huge_page(struct hstate *h)
403 return huge_page_size(h) / 512;
406 #include <asm/hugetlb.h>
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)
416 static inline struct hstate *page_hstate(struct page *page)
418 VM_BUG_ON_PAGE(!PageHuge(page), page);
419 return size_to_hstate(PAGE_SIZE << compound_order(page));
422 static inline unsigned hstate_index_to_shift(unsigned index)
424 return hstates[index].order + PAGE_SHIFT;
427 static inline int hstate_index(struct hstate *h)
432 pgoff_t __basepage_index(struct page *page);
434 /* Return page->index in PAGE_SIZE units */
435 static inline pgoff_t basepage_index(struct page *page)
437 if (!PageCompound(page))
440 return __basepage_index(page);
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)
447 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
448 return huge_page_shift(h) == PMD_SHIFT;
454 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
455 struct mm_struct *mm, pte_t *pte)
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;
463 #ifndef hugepages_supported
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
469 #define hugepages_supported() (HPAGE_SHIFT != 0)
472 #else /* CONFIG_HUGETLB_PAGE */
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
488 static inline unsigned int pages_per_huge_page(struct hstate *h)
492 #define hstate_index_to_shift(index) 0
493 #define hstate_index(h) 0
495 static inline pgoff_t basepage_index(struct page *page)
499 #define dissolve_free_huge_pages(s, e) do {} while (0)
500 #define hugepage_migration_supported(h) 0
502 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
503 struct mm_struct *mm, pte_t *pte)
505 return &mm->page_table_lock;
507 #endif /* CONFIG_HUGETLB_PAGE */
509 static inline spinlock_t *huge_pte_lock(struct hstate *h,
510 struct mm_struct *mm, pte_t *pte)
514 ptl = huge_pte_lockptr(h, mm, pte);
519 #endif /* _LINUX_HUGETLB_H */