1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #include <linux/mm_types.h>
6 #include <linux/hugetlb_inline.h>
7 #include <linux/cgroup.h>
13 #ifdef CONFIG_HUGETLB_PAGE
15 #include <linux/mempolicy.h>
16 #include <linux/shm.h>
17 #include <asm/tlbflush.h>
19 struct hugepage_subpool {
22 long max_hpages, used_hpages;
25 extern spinlock_t hugetlb_lock;
26 extern int hugetlb_max_hstate __read_mostly;
27 #define for_each_hstate(h) \
28 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
30 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
31 void hugepage_put_subpool(struct hugepage_subpool *spool);
33 int PageHuge(struct page *page);
35 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
36 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
37 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
38 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
41 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
42 void __user *, size_t *, loff_t *);
45 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
46 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
47 struct page **, struct vm_area_struct **,
48 unsigned long *, unsigned long *, long, unsigned int);
49 void unmap_hugepage_range(struct vm_area_struct *,
50 unsigned long, unsigned long, struct page *);
51 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
52 struct vm_area_struct *vma,
53 unsigned long start, unsigned long end,
54 struct page *ref_page);
55 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
56 unsigned long start, unsigned long end,
57 struct page *ref_page);
58 void hugetlb_report_meminfo(struct seq_file *);
59 int hugetlb_report_node_meminfo(int, char *);
60 void hugetlb_show_meminfo(void);
61 unsigned long hugetlb_total_pages(void);
62 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
63 unsigned long address, unsigned int flags);
64 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
65 struct vm_area_struct *vma,
67 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
68 int dequeue_hwpoisoned_huge_page(struct page *page);
69 bool isolate_huge_page(struct page *page, struct list_head *list);
70 void putback_active_hugepage(struct page *page);
71 bool is_hugepage_active(struct page *page);
73 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
74 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
77 extern unsigned long hugepages_treat_as_movable;
78 extern const unsigned long hugetlb_zero, hugetlb_infinity;
79 extern int sysctl_hugetlb_shm_group;
80 extern struct list_head huge_boot_pages;
84 pte_t *huge_pte_alloc(struct mm_struct *mm,
85 unsigned long addr, unsigned long sz);
86 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
87 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
88 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
90 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
91 pmd_t *pmd, int write);
92 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
93 pud_t *pud, int write);
94 int pmd_huge(pmd_t pmd);
95 int pud_huge(pud_t pmd);
96 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
97 unsigned long address, unsigned long end, pgprot_t newprot);
99 #else /* !CONFIG_HUGETLB_PAGE */
101 static inline int PageHuge(struct page *page)
106 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
110 static inline unsigned long hugetlb_total_pages(void)
115 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
116 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
117 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
118 static inline void hugetlb_report_meminfo(struct seq_file *m)
121 #define hugetlb_report_node_meminfo(n, buf) 0
122 static inline void hugetlb_show_meminfo(void)
125 #define follow_huge_pmd(mm, addr, pmd, write) NULL
126 #define follow_huge_pud(mm, addr, pud, write) NULL
127 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
128 #define pmd_huge(x) 0
129 #define pud_huge(x) 0
130 #define is_hugepage_only_range(mm, addr, len) 0
131 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
132 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
133 #define huge_pte_offset(mm, address) 0
134 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
139 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
143 #define putback_active_hugepage(p) do {} while (0)
144 #define is_hugepage_active(x) false
146 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
147 unsigned long address, unsigned long end, pgprot_t newprot)
152 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
153 struct vm_area_struct *vma, unsigned long start,
154 unsigned long end, struct page *ref_page)
159 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
160 struct vm_area_struct *vma, unsigned long start,
161 unsigned long end, struct page *ref_page)
166 #endif /* !CONFIG_HUGETLB_PAGE */
168 #define HUGETLB_ANON_FILE "anon_hugepage"
172 * The file will be used as an shm file so shmfs accounting rules
175 HUGETLB_SHMFS_INODE = 1,
177 * The file is being created on the internal vfs mount and shmfs
178 * accounting rules do not apply
180 HUGETLB_ANONHUGE_INODE = 2,
183 #ifdef CONFIG_HUGETLBFS
184 struct hugetlbfs_sb_info {
185 long max_inodes; /* inodes allowed */
186 long free_inodes; /* inodes free */
187 spinlock_t stat_lock;
188 struct hstate *hstate;
189 struct hugepage_subpool *spool;
192 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
194 return sb->s_fs_info;
197 extern const struct file_operations hugetlbfs_file_operations;
198 extern const struct vm_operations_struct hugetlb_vm_ops;
199 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
200 struct user_struct **user, int creat_flags,
203 static inline int is_file_hugepages(struct file *file)
205 if (file->f_op == &hugetlbfs_file_operations)
207 if (is_file_shm_hugepages(file))
214 #else /* !CONFIG_HUGETLBFS */
216 #define is_file_hugepages(file) 0
217 static inline struct file *
218 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
219 struct user_struct **user, int creat_flags,
222 return ERR_PTR(-ENOSYS);
225 #endif /* !CONFIG_HUGETLBFS */
227 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
228 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
229 unsigned long len, unsigned long pgoff,
230 unsigned long flags);
231 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
233 #ifdef CONFIG_HUGETLB_PAGE
235 #define HSTATE_NAME_LEN 32
236 /* Defines one hugetlb page size */
238 int next_nid_to_alloc;
239 int next_nid_to_free;
242 unsigned long max_huge_pages;
243 unsigned long nr_huge_pages;
244 unsigned long free_huge_pages;
245 unsigned long resv_huge_pages;
246 unsigned long surplus_huge_pages;
247 unsigned long nr_overcommit_huge_pages;
248 struct list_head hugepage_activelist;
249 struct list_head hugepage_freelists[MAX_NUMNODES];
250 unsigned int nr_huge_pages_node[MAX_NUMNODES];
251 unsigned int free_huge_pages_node[MAX_NUMNODES];
252 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
253 #ifdef CONFIG_CGROUP_HUGETLB
254 /* cgroup control files */
255 struct cftype cgroup_files[5];
257 char name[HSTATE_NAME_LEN];
260 struct huge_bootmem_page {
261 struct list_head list;
262 struct hstate *hstate;
263 #ifdef CONFIG_HIGHMEM
268 struct page *alloc_huge_page_node(struct hstate *h, int nid);
269 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
270 unsigned long addr, int avoid_reserve);
273 int __init alloc_bootmem_huge_page(struct hstate *h);
275 void __init hugetlb_add_hstate(unsigned order);
276 struct hstate *size_to_hstate(unsigned long size);
278 #ifndef HUGE_MAX_HSTATE
279 #define HUGE_MAX_HSTATE 1
282 extern struct hstate hstates[HUGE_MAX_HSTATE];
283 extern unsigned int default_hstate_idx;
285 #define default_hstate (hstates[default_hstate_idx])
287 static inline struct hstate *hstate_inode(struct inode *i)
289 struct hugetlbfs_sb_info *hsb;
290 hsb = HUGETLBFS_SB(i->i_sb);
294 static inline struct hstate *hstate_file(struct file *f)
296 return hstate_inode(file_inode(f));
299 static inline struct hstate *hstate_sizelog(int page_size_log)
302 return &default_hstate;
303 return size_to_hstate(1 << page_size_log);
306 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
308 return hstate_file(vma->vm_file);
311 static inline unsigned long huge_page_size(struct hstate *h)
313 return (unsigned long)PAGE_SIZE << h->order;
316 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
318 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
320 static inline unsigned long huge_page_mask(struct hstate *h)
325 static inline unsigned int huge_page_order(struct hstate *h)
330 static inline unsigned huge_page_shift(struct hstate *h)
332 return h->order + PAGE_SHIFT;
335 static inline unsigned int pages_per_huge_page(struct hstate *h)
337 return 1 << h->order;
340 static inline unsigned int blocks_per_huge_page(struct hstate *h)
342 return huge_page_size(h) / 512;
345 #include <asm/hugetlb.h>
347 #ifndef arch_make_huge_pte
348 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
349 struct page *page, int writable)
355 static inline struct hstate *page_hstate(struct page *page)
357 VM_BUG_ON(!PageHuge(page));
358 return size_to_hstate(PAGE_SIZE << compound_order(page));
361 static inline unsigned hstate_index_to_shift(unsigned index)
363 return hstates[index].order + PAGE_SHIFT;
366 static inline int hstate_index(struct hstate *h)
371 pgoff_t __basepage_index(struct page *page);
373 /* Return page->index in PAGE_SIZE units */
374 static inline pgoff_t basepage_index(struct page *page)
376 if (!PageCompound(page))
379 return __basepage_index(page);
382 extern void dissolve_free_huge_pages(unsigned long start_pfn,
383 unsigned long end_pfn);
384 int pmd_huge_support(void);
386 * Currently hugepage migration is enabled only for pmd-based hugepage.
387 * This function will be updated when hugepage migration is more widely
390 static inline int hugepage_migration_support(struct hstate *h)
392 return pmd_huge_support() && (huge_page_shift(h) == PMD_SHIFT);
395 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
396 struct mm_struct *mm, pte_t *pte)
398 if (huge_page_size(h) == PMD_SIZE)
399 return pmd_lockptr(mm, (pmd_t *) pte);
400 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
401 return &mm->page_table_lock;
404 #else /* CONFIG_HUGETLB_PAGE */
406 #define alloc_huge_page_node(h, nid) NULL
407 #define alloc_huge_page_noerr(v, a, r) NULL
408 #define alloc_bootmem_huge_page(h) NULL
409 #define hstate_file(f) NULL
410 #define hstate_sizelog(s) NULL
411 #define hstate_vma(v) NULL
412 #define hstate_inode(i) NULL
413 #define page_hstate(page) NULL
414 #define huge_page_size(h) PAGE_SIZE
415 #define huge_page_mask(h) PAGE_MASK
416 #define vma_kernel_pagesize(v) PAGE_SIZE
417 #define vma_mmu_pagesize(v) PAGE_SIZE
418 #define huge_page_order(h) 0
419 #define huge_page_shift(h) PAGE_SHIFT
420 static inline unsigned int pages_per_huge_page(struct hstate *h)
424 #define hstate_index_to_shift(index) 0
425 #define hstate_index(h) 0
427 static inline pgoff_t basepage_index(struct page *page)
431 #define dissolve_free_huge_pages(s, e) do {} while (0)
432 #define pmd_huge_support() 0
433 #define hugepage_migration_support(h) 0
435 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
436 struct mm_struct *mm, pte_t *pte)
438 return &mm->page_table_lock;
440 #endif /* CONFIG_HUGETLB_PAGE */
442 static inline spinlock_t *huge_pte_lock(struct hstate *h,
443 struct mm_struct *mm, pte_t *pte)
447 ptl = huge_pte_lockptr(h, mm, pte);
452 #endif /* _LINUX_HUGETLB_H */