1 #ifndef _LINUX_HUGETLB_H 2 #define _LINUX_HUGETLB_H 3 4 #include <linux/mm_types.h> 5 #include <linux/fs.h> 6 #include <linux/hugetlb_inline.h> 7 8 struct ctl_table; 9 struct user_struct; 10 11 #ifdef CONFIG_HUGETLB_PAGE 12 13 #include <linux/mempolicy.h> 14 #include <linux/shm.h> 15 #include <asm/tlbflush.h> 16 17 struct hugepage_subpool { 18 spinlock_t lock; 19 long count; 20 long max_hpages, used_hpages; 21 }; 22 23 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks); 24 void hugepage_put_subpool(struct hugepage_subpool *spool); 25 26 int PageHuge(struct page *page); 27 28 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 29 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 30 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 31 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 32 33 #ifdef CONFIG_NUMA 34 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, 35 void __user *, size_t *, loff_t *); 36 #endif 37 38 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 39 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 40 struct page **, struct vm_area_struct **, 41 unsigned long *, int *, int, unsigned int flags); 42 void unmap_hugepage_range(struct vm_area_struct *, 43 unsigned long, unsigned long, struct page *); 44 void __unmap_hugepage_range(struct vm_area_struct *, 45 unsigned long, unsigned long, struct page *); 46 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 47 void hugetlb_report_meminfo(struct seq_file *); 48 int hugetlb_report_node_meminfo(int, char *); 49 unsigned long hugetlb_total_pages(void); 50 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 51 unsigned long address, unsigned int flags); 52 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 53 struct vm_area_struct *vma, 54 vm_flags_t vm_flags); 55 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 56 int dequeue_hwpoisoned_huge_page(struct page *page); 57 void copy_huge_page(struct page *dst, struct page *src); 58 59 extern unsigned long hugepages_treat_as_movable; 60 extern const unsigned long hugetlb_zero, hugetlb_infinity; 61 extern int sysctl_hugetlb_shm_group; 62 extern struct list_head huge_boot_pages; 63 64 /* arch callbacks */ 65 66 pte_t *huge_pte_alloc(struct mm_struct *mm, 67 unsigned long addr, unsigned long sz); 68 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 69 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 70 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 71 int write); 72 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 73 pmd_t *pmd, int write); 74 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 75 pud_t *pud, int write); 76 int pmd_huge(pmd_t pmd); 77 int pud_huge(pud_t pmd); 78 void hugetlb_change_protection(struct vm_area_struct *vma, 79 unsigned long address, unsigned long end, pgprot_t newprot); 80 81 #else /* !CONFIG_HUGETLB_PAGE */ 82 83 static inline int PageHuge(struct page *page) 84 { 85 return 0; 86 } 87 88 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 89 { 90 } 91 92 static inline unsigned long hugetlb_total_pages(void) 93 { 94 return 0; 95 } 96 97 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 98 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 99 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 100 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 101 #define unmap_hugepage_range(vma, start, end, page) BUG() 102 static inline void hugetlb_report_meminfo(struct seq_file *m) 103 { 104 } 105 #define hugetlb_report_node_meminfo(n, buf) 0 106 #define follow_huge_pmd(mm, addr, pmd, write) NULL 107 #define follow_huge_pud(mm, addr, pud, write) NULL 108 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 109 #define pmd_huge(x) 0 110 #define pud_huge(x) 0 111 #define is_hugepage_only_range(mm, addr, len) 0 112 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 113 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 114 #define huge_pte_offset(mm, address) 0 115 #define dequeue_hwpoisoned_huge_page(page) 0 116 static inline void copy_huge_page(struct page *dst, struct page *src) 117 { 118 } 119 120 #define hugetlb_change_protection(vma, address, end, newprot) 121 122 #endif /* !CONFIG_HUGETLB_PAGE */ 123 124 #define HUGETLB_ANON_FILE "anon_hugepage" 125 126 enum { 127 /* 128 * The file will be used as an shm file so shmfs accounting rules 129 * apply 130 */ 131 HUGETLB_SHMFS_INODE = 1, 132 /* 133 * The file is being created on the internal vfs mount and shmfs 134 * accounting rules do not apply 135 */ 136 HUGETLB_ANONHUGE_INODE = 2, 137 }; 138 139 #ifdef CONFIG_HUGETLBFS 140 struct hugetlbfs_sb_info { 141 long max_inodes; /* inodes allowed */ 142 long free_inodes; /* inodes free */ 143 spinlock_t stat_lock; 144 struct hstate *hstate; 145 struct hugepage_subpool *spool; 146 }; 147 148 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 149 { 150 return sb->s_fs_info; 151 } 152 153 extern const struct file_operations hugetlbfs_file_operations; 154 extern const struct vm_operations_struct hugetlb_vm_ops; 155 struct file *hugetlb_file_setup(const char *name, unsigned long addr, 156 size_t size, vm_flags_t acct, 157 struct user_struct **user, int creat_flags); 158 159 static inline int is_file_hugepages(struct file *file) 160 { 161 if (file->f_op == &hugetlbfs_file_operations) 162 return 1; 163 if (is_file_shm_hugepages(file)) 164 return 1; 165 166 return 0; 167 } 168 169 #else /* !CONFIG_HUGETLBFS */ 170 171 #define is_file_hugepages(file) 0 172 static inline struct file * 173 hugetlb_file_setup(const char *name, unsigned long addr, size_t size, 174 vm_flags_t acctflag, struct user_struct **user, int creat_flags) 175 { 176 return ERR_PTR(-ENOSYS); 177 } 178 179 #endif /* !CONFIG_HUGETLBFS */ 180 181 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 182 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 183 unsigned long len, unsigned long pgoff, 184 unsigned long flags); 185 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 186 187 #ifdef CONFIG_HUGETLB_PAGE 188 189 #define HSTATE_NAME_LEN 32 190 /* Defines one hugetlb page size */ 191 struct hstate { 192 int next_nid_to_alloc; 193 int next_nid_to_free; 194 unsigned int order; 195 unsigned long mask; 196 unsigned long max_huge_pages; 197 unsigned long nr_huge_pages; 198 unsigned long free_huge_pages; 199 unsigned long resv_huge_pages; 200 unsigned long surplus_huge_pages; 201 unsigned long nr_overcommit_huge_pages; 202 struct list_head hugepage_freelists[MAX_NUMNODES]; 203 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 204 unsigned int free_huge_pages_node[MAX_NUMNODES]; 205 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 206 char name[HSTATE_NAME_LEN]; 207 }; 208 209 struct huge_bootmem_page { 210 struct list_head list; 211 struct hstate *hstate; 212 #ifdef CONFIG_HIGHMEM 213 phys_addr_t phys; 214 #endif 215 }; 216 217 struct page *alloc_huge_page_node(struct hstate *h, int nid); 218 219 /* arch callback */ 220 int __init alloc_bootmem_huge_page(struct hstate *h); 221 222 void __init hugetlb_add_hstate(unsigned order); 223 struct hstate *size_to_hstate(unsigned long size); 224 225 #ifndef HUGE_MAX_HSTATE 226 #define HUGE_MAX_HSTATE 1 227 #endif 228 229 extern struct hstate hstates[HUGE_MAX_HSTATE]; 230 extern unsigned int default_hstate_idx; 231 232 #define default_hstate (hstates[default_hstate_idx]) 233 234 static inline struct hstate *hstate_inode(struct inode *i) 235 { 236 struct hugetlbfs_sb_info *hsb; 237 hsb = HUGETLBFS_SB(i->i_sb); 238 return hsb->hstate; 239 } 240 241 static inline struct hstate *hstate_file(struct file *f) 242 { 243 return hstate_inode(f->f_dentry->d_inode); 244 } 245 246 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 247 { 248 return hstate_file(vma->vm_file); 249 } 250 251 static inline unsigned long huge_page_size(struct hstate *h) 252 { 253 return (unsigned long)PAGE_SIZE << h->order; 254 } 255 256 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 257 258 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 259 260 static inline unsigned long huge_page_mask(struct hstate *h) 261 { 262 return h->mask; 263 } 264 265 static inline unsigned int huge_page_order(struct hstate *h) 266 { 267 return h->order; 268 } 269 270 static inline unsigned huge_page_shift(struct hstate *h) 271 { 272 return h->order + PAGE_SHIFT; 273 } 274 275 static inline unsigned int pages_per_huge_page(struct hstate *h) 276 { 277 return 1 << h->order; 278 } 279 280 static inline unsigned int blocks_per_huge_page(struct hstate *h) 281 { 282 return huge_page_size(h) / 512; 283 } 284 285 #include <asm/hugetlb.h> 286 287 #ifndef arch_make_huge_pte 288 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma, 289 struct page *page, int writable) 290 { 291 return entry; 292 } 293 #endif 294 295 static inline struct hstate *page_hstate(struct page *page) 296 { 297 return size_to_hstate(PAGE_SIZE << compound_order(page)); 298 } 299 300 static inline unsigned hstate_index_to_shift(unsigned index) 301 { 302 return hstates[index].order + PAGE_SHIFT; 303 } 304 305 #else 306 struct hstate {}; 307 #define alloc_huge_page_node(h, nid) NULL 308 #define alloc_bootmem_huge_page(h) NULL 309 #define hstate_file(f) NULL 310 #define hstate_vma(v) NULL 311 #define hstate_inode(i) NULL 312 #define huge_page_size(h) PAGE_SIZE 313 #define huge_page_mask(h) PAGE_MASK 314 #define vma_kernel_pagesize(v) PAGE_SIZE 315 #define vma_mmu_pagesize(v) PAGE_SIZE 316 #define huge_page_order(h) 0 317 #define huge_page_shift(h) PAGE_SHIFT 318 static inline unsigned int pages_per_huge_page(struct hstate *h) 319 { 320 return 1; 321 } 322 #define hstate_index_to_shift(index) 0 323 #endif 324 325 #endif /* _LINUX_HUGETLB_H */ 326