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