1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
6 #ifdef CONFIG_HUGETLB_PAGE
8 #include <linux/mempolicy.h>
10 #include <asm/tlbflush.h>
14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
16 return vma->vm_flags & VM_HUGETLB;
19 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
20 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
21 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
22 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
23 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
24 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
25 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
26 int hugetlb_report_meminfo(char *);
27 int hugetlb_report_node_meminfo(int, char *);
28 unsigned long hugetlb_total_pages(void);
29 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
30 unsigned long address, int write_access);
31 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
32 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
34 extern unsigned long max_huge_pages;
35 extern unsigned long hugepages_treat_as_movable;
36 extern unsigned long nr_overcommit_huge_pages;
37 extern const unsigned long hugetlb_zero, hugetlb_infinity;
38 extern int sysctl_hugetlb_shm_group;
42 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
43 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
44 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
45 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
47 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
48 pmd_t *pmd, int write);
49 int pmd_huge(pmd_t pmd);
50 void hugetlb_change_protection(struct vm_area_struct *vma,
51 unsigned long address, unsigned long end, pgprot_t newprot);
53 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
54 #define is_hugepage_only_range(mm, addr, len) 0
57 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
58 #define hugetlb_free_pgd_range free_pgd_range
60 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
61 unsigned long end, unsigned long floor,
62 unsigned long ceiling);
65 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
67 * If the arch doesn't supply something else, assume that hugepage
68 * size aligned regions are ok without further preparation.
70 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
72 if (len & ~HPAGE_MASK)
74 if (addr & ~HPAGE_MASK)
79 int prepare_hugepage_range(unsigned long addr, unsigned long len);
82 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
83 #define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
84 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
86 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
87 pte_t *ptep, pte_t pte);
88 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
92 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
93 #define hugetlb_prefault_arch_hook(mm) do { } while (0)
95 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
98 #else /* !CONFIG_HUGETLB_PAGE */
100 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
104 static inline unsigned long hugetlb_total_pages(void)
109 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
110 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
111 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
112 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
113 #define unmap_hugepage_range(vma, start, end) BUG()
114 #define hugetlb_report_meminfo(buf) 0
115 #define hugetlb_report_node_meminfo(n, buf) 0
116 #define follow_huge_pmd(mm, addr, pmd, write) NULL
117 #define prepare_hugepage_range(addr,len) (-EINVAL)
118 #define pmd_huge(x) 0
119 #define is_hugepage_only_range(mm, addr, len) 0
120 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
121 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
123 #define hugetlb_change_protection(vma, address, end, newprot)
126 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
127 #define HPAGE_SIZE PAGE_SIZE
130 #endif /* !CONFIG_HUGETLB_PAGE */
132 #ifdef CONFIG_HUGETLBFS
133 struct hugetlbfs_config {
141 struct hugetlbfs_sb_info {
142 long max_blocks; /* blocks allowed */
143 long free_blocks; /* blocks free */
144 long max_inodes; /* inodes allowed */
145 long free_inodes; /* inodes free */
146 spinlock_t stat_lock;
150 struct hugetlbfs_inode_info {
151 struct shared_policy policy;
152 struct inode vfs_inode;
155 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
157 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
160 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
162 return sb->s_fs_info;
165 extern const struct file_operations hugetlbfs_file_operations;
166 extern struct vm_operations_struct hugetlb_vm_ops;
167 struct file *hugetlb_file_setup(const char *name, size_t);
168 int hugetlb_get_quota(struct address_space *mapping, long delta);
169 void hugetlb_put_quota(struct address_space *mapping, long delta);
171 #define BLOCKS_PER_HUGEPAGE (HPAGE_SIZE / 512)
173 static inline int is_file_hugepages(struct file *file)
175 if (file->f_op == &hugetlbfs_file_operations)
177 if (is_file_shm_hugepages(file))
183 static inline void set_file_hugepages(struct file *file)
185 file->f_op = &hugetlbfs_file_operations;
187 #else /* !CONFIG_HUGETLBFS */
189 #define is_file_hugepages(file) 0
190 #define set_file_hugepages(file) BUG()
191 #define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
193 #endif /* !CONFIG_HUGETLBFS */
195 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
196 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
197 unsigned long len, unsigned long pgoff,
198 unsigned long flags);
199 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
201 #endif /* _LINUX_HUGETLB_H */