1 #ifndef _ASM_POWERPC_HUGETLB_H 2 #define _ASM_POWERPC_HUGETLB_H 3 4 #ifdef CONFIG_HUGETLB_PAGE 5 #include <asm/page.h> 6 #include <asm-generic/hugetlb.h> 7 8 extern struct kmem_cache *hugepte_cache; 9 10 #ifdef CONFIG_PPC_BOOK3S_64 11 12 #include <asm/book3s/64/hugetlb.h> 13 /* 14 * This should work for other subarchs too. But right now we use the 15 * new format only for 64bit book3s 16 */ 17 static inline pte_t *hugepd_page(hugepd_t hpd) 18 { 19 BUG_ON(!hugepd_ok(hpd)); 20 /* 21 * We have only four bits to encode, MMU page size 22 */ 23 BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf); 24 return __va(hpd.pd & HUGEPD_ADDR_MASK); 25 } 26 27 static inline unsigned int hugepd_mmu_psize(hugepd_t hpd) 28 { 29 return (hpd.pd & HUGEPD_SHIFT_MASK) >> 2; 30 } 31 32 static inline unsigned int hugepd_shift(hugepd_t hpd) 33 { 34 return mmu_psize_to_shift(hugepd_mmu_psize(hpd)); 35 } 36 static inline void flush_hugetlb_page(struct vm_area_struct *vma, 37 unsigned long vmaddr) 38 { 39 if (radix_enabled()) 40 return radix__flush_hugetlb_page(vma, vmaddr); 41 } 42 43 static inline void __local_flush_hugetlb_page(struct vm_area_struct *vma, 44 unsigned long vmaddr) 45 { 46 if (radix_enabled()) 47 return radix__local_flush_hugetlb_page(vma, vmaddr); 48 } 49 #else 50 51 static inline pte_t *hugepd_page(hugepd_t hpd) 52 { 53 BUG_ON(!hugepd_ok(hpd)); 54 #ifdef CONFIG_PPC_8xx 55 return (pte_t *)__va(hpd.pd & ~(_PMD_PAGE_MASK | _PMD_PRESENT_MASK)); 56 #else 57 return (pte_t *)((hpd.pd & ~HUGEPD_SHIFT_MASK) | PD_HUGE); 58 #endif 59 } 60 61 static inline unsigned int hugepd_shift(hugepd_t hpd) 62 { 63 #ifdef CONFIG_PPC_8xx 64 return ((hpd.pd & _PMD_PAGE_MASK) >> 1) + 17; 65 #else 66 return hpd.pd & HUGEPD_SHIFT_MASK; 67 #endif 68 } 69 70 #endif /* CONFIG_PPC_BOOK3S_64 */ 71 72 73 static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr, 74 unsigned pdshift) 75 { 76 /* 77 * On FSL BookE, we have multiple higher-level table entries that 78 * point to the same hugepte. Just use the first one since they're all 79 * identical. So for that case, idx=0. 80 */ 81 unsigned long idx = 0; 82 83 pte_t *dir = hugepd_page(hpd); 84 #ifndef CONFIG_PPC_FSL_BOOK3E 85 idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd); 86 #endif 87 88 return dir + idx; 89 } 90 91 pte_t *huge_pte_offset_and_shift(struct mm_struct *mm, 92 unsigned long addr, unsigned *shift); 93 94 void flush_dcache_icache_hugepage(struct page *page); 95 96 #if defined(CONFIG_PPC_MM_SLICES) 97 int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr, 98 unsigned long len); 99 #else 100 static inline int is_hugepage_only_range(struct mm_struct *mm, 101 unsigned long addr, 102 unsigned long len) 103 { 104 return 0; 105 } 106 #endif 107 108 void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea, 109 pte_t pte); 110 #ifdef CONFIG_PPC_8xx 111 static inline void flush_hugetlb_page(struct vm_area_struct *vma, 112 unsigned long vmaddr) 113 { 114 flush_tlb_page(vma, vmaddr); 115 } 116 #else 117 void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr); 118 #endif 119 120 void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr, 121 unsigned long end, unsigned long floor, 122 unsigned long ceiling); 123 124 /* 125 * The version of vma_mmu_pagesize() in arch/powerpc/mm/hugetlbpage.c needs 126 * to override the version in mm/hugetlb.c 127 */ 128 #define vma_mmu_pagesize vma_mmu_pagesize 129 130 /* 131 * If the arch doesn't supply something else, assume that hugepage 132 * size aligned regions are ok without further preparation. 133 */ 134 static inline int prepare_hugepage_range(struct file *file, 135 unsigned long addr, unsigned long len) 136 { 137 struct hstate *h = hstate_file(file); 138 if (len & ~huge_page_mask(h)) 139 return -EINVAL; 140 if (addr & ~huge_page_mask(h)) 141 return -EINVAL; 142 return 0; 143 } 144 145 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 146 pte_t *ptep, pte_t pte) 147 { 148 set_pte_at(mm, addr, ptep, pte); 149 } 150 151 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 152 unsigned long addr, pte_t *ptep) 153 { 154 #ifdef CONFIG_PPC64 155 return __pte(pte_update(mm, addr, ptep, ~0UL, 0, 1)); 156 #else 157 return __pte(pte_update(ptep, ~0UL, 0)); 158 #endif 159 } 160 161 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, 162 unsigned long addr, pte_t *ptep) 163 { 164 pte_t pte; 165 pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); 166 flush_hugetlb_page(vma, addr); 167 } 168 169 static inline int huge_pte_none(pte_t pte) 170 { 171 return pte_none(pte); 172 } 173 174 static inline pte_t huge_pte_wrprotect(pte_t pte) 175 { 176 return pte_wrprotect(pte); 177 } 178 179 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 180 unsigned long addr, pte_t *ptep, 181 pte_t pte, int dirty) 182 { 183 #ifdef HUGETLB_NEED_PRELOAD 184 /* 185 * The "return 1" forces a call of update_mmu_cache, which will write a 186 * TLB entry. Without this, platforms that don't do a write of the TLB 187 * entry in the TLB miss handler asm will fault ad infinitum. 188 */ 189 ptep_set_access_flags(vma, addr, ptep, pte, dirty); 190 return 1; 191 #else 192 return ptep_set_access_flags(vma, addr, ptep, pte, dirty); 193 #endif 194 } 195 196 static inline pte_t huge_ptep_get(pte_t *ptep) 197 { 198 return *ptep; 199 } 200 201 static inline void arch_clear_hugepage_flags(struct page *page) 202 { 203 } 204 205 #else /* ! CONFIG_HUGETLB_PAGE */ 206 static inline void flush_hugetlb_page(struct vm_area_struct *vma, 207 unsigned long vmaddr) 208 { 209 } 210 211 #define hugepd_shift(x) 0 212 static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr, 213 unsigned pdshift) 214 { 215 return 0; 216 } 217 #endif /* CONFIG_HUGETLB_PAGE */ 218 219 /* 220 * FSL Book3E platforms require special gpage handling - the gpages 221 * are reserved early in the boot process by memblock instead of via 222 * the .dts as on IBM platforms. 223 */ 224 #if defined(CONFIG_HUGETLB_PAGE) && (defined(CONFIG_PPC_FSL_BOOK3E) || \ 225 defined(CONFIG_PPC_8xx)) 226 extern void __init reserve_hugetlb_gpages(void); 227 #else 228 static inline void reserve_hugetlb_gpages(void) 229 { 230 } 231 #endif 232 233 #endif /* _ASM_POWERPC_HUGETLB_H */ 234