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 struct user_struct; 14 15 int PageHuge(struct page *page); 16 17 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 18 { 19 return vma->vm_flags & VM_HUGETLB; 20 } 21 22 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 23 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 24 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 25 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); 26 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 27 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int); 28 void unmap_hugepage_range(struct vm_area_struct *, 29 unsigned long, unsigned long, struct page *); 30 void __unmap_hugepage_range(struct vm_area_struct *, 31 unsigned long, unsigned long, struct page *); 32 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 33 void hugetlb_report_meminfo(struct seq_file *); 34 int hugetlb_report_node_meminfo(int, char *); 35 unsigned long hugetlb_total_pages(void); 36 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 37 unsigned long address, unsigned int flags); 38 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 39 struct vm_area_struct *vma, 40 int acctflags); 41 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 42 43 extern unsigned long hugepages_treat_as_movable; 44 extern const unsigned long hugetlb_zero, hugetlb_infinity; 45 extern int sysctl_hugetlb_shm_group; 46 extern struct list_head huge_boot_pages; 47 48 /* arch callbacks */ 49 50 pte_t *huge_pte_alloc(struct mm_struct *mm, 51 unsigned long addr, unsigned long sz); 52 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 53 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 54 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 55 int write); 56 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 57 pmd_t *pmd, int write); 58 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 59 pud_t *pud, int write); 60 int pmd_huge(pmd_t pmd); 61 int pud_huge(pud_t pmd); 62 void hugetlb_change_protection(struct vm_area_struct *vma, 63 unsigned long address, unsigned long end, pgprot_t newprot); 64 65 #else /* !CONFIG_HUGETLB_PAGE */ 66 67 static inline int PageHuge(struct page *page) 68 { 69 return 0; 70 } 71 72 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 73 { 74 return 0; 75 } 76 77 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 78 { 79 } 80 81 static inline unsigned long hugetlb_total_pages(void) 82 { 83 return 0; 84 } 85 86 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 87 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 88 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 89 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 90 #define unmap_hugepage_range(vma, start, end, page) BUG() 91 static inline void hugetlb_report_meminfo(struct seq_file *m) 92 { 93 } 94 #define hugetlb_report_node_meminfo(n, buf) 0 95 #define follow_huge_pmd(mm, addr, pmd, write) NULL 96 #define follow_huge_pud(mm, addr, pud, write) NULL 97 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 98 #define pmd_huge(x) 0 99 #define pud_huge(x) 0 100 #define is_hugepage_only_range(mm, addr, len) 0 101 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 102 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 103 104 #define hugetlb_change_protection(vma, address, end, newprot) 105 106 #ifndef HPAGE_MASK 107 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */ 108 #define HPAGE_SIZE PAGE_SIZE 109 #endif 110 111 #endif /* !CONFIG_HUGETLB_PAGE */ 112 113 #ifdef CONFIG_HUGETLBFS 114 struct hugetlbfs_config { 115 uid_t uid; 116 gid_t gid; 117 umode_t mode; 118 long nr_blocks; 119 long nr_inodes; 120 struct hstate *hstate; 121 }; 122 123 struct hugetlbfs_sb_info { 124 long max_blocks; /* blocks allowed */ 125 long free_blocks; /* blocks free */ 126 long max_inodes; /* inodes allowed */ 127 long free_inodes; /* inodes free */ 128 spinlock_t stat_lock; 129 struct hstate *hstate; 130 }; 131 132 133 struct hugetlbfs_inode_info { 134 struct shared_policy policy; 135 struct inode vfs_inode; 136 }; 137 138 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 139 { 140 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 141 } 142 143 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 144 { 145 return sb->s_fs_info; 146 } 147 148 extern const struct file_operations hugetlbfs_file_operations; 149 extern struct vm_operations_struct hugetlb_vm_ops; 150 struct file *hugetlb_file_setup(const char *name, size_t size, int acct, 151 struct user_struct **user); 152 int hugetlb_get_quota(struct address_space *mapping, long delta); 153 void hugetlb_put_quota(struct address_space *mapping, long delta); 154 155 static inline int is_file_hugepages(struct file *file) 156 { 157 if (file->f_op == &hugetlbfs_file_operations) 158 return 1; 159 if (is_file_shm_hugepages(file)) 160 return 1; 161 162 return 0; 163 } 164 165 static inline void set_file_hugepages(struct file *file) 166 { 167 file->f_op = &hugetlbfs_file_operations; 168 } 169 #else /* !CONFIG_HUGETLBFS */ 170 171 #define is_file_hugepages(file) 0 172 #define set_file_hugepages(file) BUG() 173 #define hugetlb_file_setup(name,size,acct,user) ERR_PTR(-ENOSYS) 174 175 #endif /* !CONFIG_HUGETLBFS */ 176 177 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 178 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 179 unsigned long len, unsigned long pgoff, 180 unsigned long flags); 181 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 182 183 #ifdef CONFIG_HUGETLB_PAGE 184 185 #define HSTATE_NAME_LEN 32 186 /* Defines one hugetlb page size */ 187 struct hstate { 188 int next_nid_to_alloc; 189 int next_nid_to_free; 190 unsigned int order; 191 unsigned long mask; 192 unsigned long max_huge_pages; 193 unsigned long nr_huge_pages; 194 unsigned long free_huge_pages; 195 unsigned long resv_huge_pages; 196 unsigned long surplus_huge_pages; 197 unsigned long nr_overcommit_huge_pages; 198 struct list_head hugepage_freelists[MAX_NUMNODES]; 199 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 200 unsigned int free_huge_pages_node[MAX_NUMNODES]; 201 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 202 char name[HSTATE_NAME_LEN]; 203 }; 204 205 struct huge_bootmem_page { 206 struct list_head list; 207 struct hstate *hstate; 208 }; 209 210 /* arch callback */ 211 int __init alloc_bootmem_huge_page(struct hstate *h); 212 213 void __init hugetlb_add_hstate(unsigned order); 214 struct hstate *size_to_hstate(unsigned long size); 215 216 #ifndef HUGE_MAX_HSTATE 217 #define HUGE_MAX_HSTATE 1 218 #endif 219 220 extern struct hstate hstates[HUGE_MAX_HSTATE]; 221 extern unsigned int default_hstate_idx; 222 223 #define default_hstate (hstates[default_hstate_idx]) 224 225 static inline struct hstate *hstate_inode(struct inode *i) 226 { 227 struct hugetlbfs_sb_info *hsb; 228 hsb = HUGETLBFS_SB(i->i_sb); 229 return hsb->hstate; 230 } 231 232 static inline struct hstate *hstate_file(struct file *f) 233 { 234 return hstate_inode(f->f_dentry->d_inode); 235 } 236 237 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 238 { 239 return hstate_file(vma->vm_file); 240 } 241 242 static inline unsigned long huge_page_size(struct hstate *h) 243 { 244 return (unsigned long)PAGE_SIZE << h->order; 245 } 246 247 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 248 249 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 250 251 static inline unsigned long huge_page_mask(struct hstate *h) 252 { 253 return h->mask; 254 } 255 256 static inline unsigned int huge_page_order(struct hstate *h) 257 { 258 return h->order; 259 } 260 261 static inline unsigned huge_page_shift(struct hstate *h) 262 { 263 return h->order + PAGE_SHIFT; 264 } 265 266 static inline unsigned int pages_per_huge_page(struct hstate *h) 267 { 268 return 1 << h->order; 269 } 270 271 static inline unsigned int blocks_per_huge_page(struct hstate *h) 272 { 273 return huge_page_size(h) / 512; 274 } 275 276 #include <asm/hugetlb.h> 277 278 static inline struct hstate *page_hstate(struct page *page) 279 { 280 return size_to_hstate(PAGE_SIZE << compound_order(page)); 281 } 282 283 #else 284 struct hstate {}; 285 #define alloc_bootmem_huge_page(h) NULL 286 #define hstate_file(f) NULL 287 #define hstate_vma(v) NULL 288 #define hstate_inode(i) NULL 289 #define huge_page_size(h) PAGE_SIZE 290 #define huge_page_mask(h) PAGE_MASK 291 #define vma_kernel_pagesize(v) PAGE_SIZE 292 #define vma_mmu_pagesize(v) PAGE_SIZE 293 #define huge_page_order(h) 0 294 #define huge_page_shift(h) PAGE_SHIFT 295 static inline unsigned int pages_per_huge_page(struct hstate *h) 296 { 297 return 1; 298 } 299 #endif 300 301 #endif /* _LINUX_HUGETLB_H */ 302