1 #ifndef _LINUX_HUGETLB_H 2 #define _LINUX_HUGETLB_H 3 4 #include <linux/fs.h> 5 6 #ifdef CONFIG_HUGETLB_PAGE 7 8 #include <linux/mempolicy.h> 9 #include <linux/shm.h> 10 #include <asm/tlbflush.h> 11 12 struct ctl_table; 13 14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 15 { 16 return vma->vm_flags & VM_HUGETLB; 17 } 18 19 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int); 25 void unmap_hugepage_range(struct vm_area_struct *, 26 unsigned long, unsigned long, struct page *); 27 void __unmap_hugepage_range(struct vm_area_struct *, 28 unsigned long, unsigned long, struct page *); 29 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 30 void hugetlb_report_meminfo(struct seq_file *); 31 int hugetlb_report_node_meminfo(int, char *); 32 unsigned long hugetlb_total_pages(void); 33 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 34 unsigned long address, int write_access); 35 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 36 struct vm_area_struct *vma); 37 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 38 39 extern unsigned long hugepages_treat_as_movable; 40 extern const unsigned long hugetlb_zero, hugetlb_infinity; 41 extern int sysctl_hugetlb_shm_group; 42 extern struct list_head huge_boot_pages; 43 44 /* arch callbacks */ 45 46 pte_t *huge_pte_alloc(struct mm_struct *mm, 47 unsigned long addr, unsigned long sz); 48 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 49 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 50 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 51 int write); 52 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 53 pmd_t *pmd, int write); 54 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 55 pud_t *pud, int write); 56 int pmd_huge(pmd_t pmd); 57 int pud_huge(pud_t pmd); 58 void hugetlb_change_protection(struct vm_area_struct *vma, 59 unsigned long address, unsigned long end, pgprot_t newprot); 60 61 #else /* !CONFIG_HUGETLB_PAGE */ 62 63 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 64 { 65 return 0; 66 } 67 68 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 69 { 70 } 71 72 static inline unsigned long hugetlb_total_pages(void) 73 { 74 return 0; 75 } 76 77 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 78 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 79 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 80 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 81 #define unmap_hugepage_range(vma, start, end, page) BUG() 82 static inline void hugetlb_report_meminfo(struct seq_file *m) 83 { 84 } 85 #define hugetlb_report_node_meminfo(n, buf) 0 86 #define follow_huge_pmd(mm, addr, pmd, write) NULL 87 #define follow_huge_pud(mm, addr, pud, write) NULL 88 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 89 #define pmd_huge(x) 0 90 #define pud_huge(x) 0 91 #define is_hugepage_only_range(mm, addr, len) 0 92 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 93 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; }) 94 95 #define hugetlb_change_protection(vma, address, end, newprot) 96 97 #ifndef HPAGE_MASK 98 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */ 99 #define HPAGE_SIZE PAGE_SIZE 100 #endif 101 102 #endif /* !CONFIG_HUGETLB_PAGE */ 103 104 #ifdef CONFIG_HUGETLBFS 105 struct hugetlbfs_config { 106 uid_t uid; 107 gid_t gid; 108 umode_t mode; 109 long nr_blocks; 110 long nr_inodes; 111 struct hstate *hstate; 112 }; 113 114 struct hugetlbfs_sb_info { 115 long max_blocks; /* blocks allowed */ 116 long free_blocks; /* blocks free */ 117 long max_inodes; /* inodes allowed */ 118 long free_inodes; /* inodes free */ 119 spinlock_t stat_lock; 120 struct hstate *hstate; 121 }; 122 123 124 struct hugetlbfs_inode_info { 125 struct shared_policy policy; 126 struct inode vfs_inode; 127 }; 128 129 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 130 { 131 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 132 } 133 134 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 135 { 136 return sb->s_fs_info; 137 } 138 139 extern const struct file_operations hugetlbfs_file_operations; 140 extern struct vm_operations_struct hugetlb_vm_ops; 141 struct file *hugetlb_file_setup(const char *name, size_t); 142 int hugetlb_get_quota(struct address_space *mapping, long delta); 143 void hugetlb_put_quota(struct address_space *mapping, long delta); 144 145 static inline int is_file_hugepages(struct file *file) 146 { 147 if (file->f_op == &hugetlbfs_file_operations) 148 return 1; 149 if (is_file_shm_hugepages(file)) 150 return 1; 151 152 return 0; 153 } 154 155 static inline void set_file_hugepages(struct file *file) 156 { 157 file->f_op = &hugetlbfs_file_operations; 158 } 159 #else /* !CONFIG_HUGETLBFS */ 160 161 #define is_file_hugepages(file) 0 162 #define set_file_hugepages(file) BUG() 163 #define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS) 164 165 #endif /* !CONFIG_HUGETLBFS */ 166 167 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 168 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 169 unsigned long len, unsigned long pgoff, 170 unsigned long flags); 171 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 172 173 #ifdef CONFIG_HUGETLB_PAGE 174 175 #define HSTATE_NAME_LEN 32 176 /* Defines one hugetlb page size */ 177 struct hstate { 178 int hugetlb_next_nid; 179 unsigned int order; 180 unsigned long mask; 181 unsigned long max_huge_pages; 182 unsigned long nr_huge_pages; 183 unsigned long free_huge_pages; 184 unsigned long resv_huge_pages; 185 unsigned long surplus_huge_pages; 186 unsigned long nr_overcommit_huge_pages; 187 struct list_head hugepage_freelists[MAX_NUMNODES]; 188 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 189 unsigned int free_huge_pages_node[MAX_NUMNODES]; 190 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 191 char name[HSTATE_NAME_LEN]; 192 }; 193 194 struct huge_bootmem_page { 195 struct list_head list; 196 struct hstate *hstate; 197 }; 198 199 /* arch callback */ 200 int __init alloc_bootmem_huge_page(struct hstate *h); 201 202 void __init hugetlb_add_hstate(unsigned order); 203 struct hstate *size_to_hstate(unsigned long size); 204 205 #ifndef HUGE_MAX_HSTATE 206 #define HUGE_MAX_HSTATE 1 207 #endif 208 209 extern struct hstate hstates[HUGE_MAX_HSTATE]; 210 extern unsigned int default_hstate_idx; 211 212 #define default_hstate (hstates[default_hstate_idx]) 213 214 static inline struct hstate *hstate_inode(struct inode *i) 215 { 216 struct hugetlbfs_sb_info *hsb; 217 hsb = HUGETLBFS_SB(i->i_sb); 218 return hsb->hstate; 219 } 220 221 static inline struct hstate *hstate_file(struct file *f) 222 { 223 return hstate_inode(f->f_dentry->d_inode); 224 } 225 226 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 227 { 228 return hstate_file(vma->vm_file); 229 } 230 231 static inline unsigned long huge_page_size(struct hstate *h) 232 { 233 return (unsigned long)PAGE_SIZE << h->order; 234 } 235 236 static inline unsigned long huge_page_mask(struct hstate *h) 237 { 238 return h->mask; 239 } 240 241 static inline unsigned int huge_page_order(struct hstate *h) 242 { 243 return h->order; 244 } 245 246 static inline unsigned huge_page_shift(struct hstate *h) 247 { 248 return h->order + PAGE_SHIFT; 249 } 250 251 static inline unsigned int pages_per_huge_page(struct hstate *h) 252 { 253 return 1 << h->order; 254 } 255 256 static inline unsigned int blocks_per_huge_page(struct hstate *h) 257 { 258 return huge_page_size(h) / 512; 259 } 260 261 #include <asm/hugetlb.h> 262 263 static inline struct hstate *page_hstate(struct page *page) 264 { 265 return size_to_hstate(PAGE_SIZE << compound_order(page)); 266 } 267 268 #else 269 struct hstate {}; 270 #define alloc_bootmem_huge_page(h) NULL 271 #define hstate_file(f) NULL 272 #define hstate_vma(v) NULL 273 #define hstate_inode(i) NULL 274 #define huge_page_size(h) PAGE_SIZE 275 #define huge_page_mask(h) PAGE_MASK 276 #define huge_page_order(h) 0 277 #define huge_page_shift(h) PAGE_SHIFT 278 static inline unsigned int pages_per_huge_page(struct hstate *h) 279 { 280 return 1; 281 } 282 #endif 283 284 #endif /* _LINUX_HUGETLB_H */ 285