1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_SH_TLB_H 3 #define __ASM_SH_TLB_H 4 5 #ifdef CONFIG_SUPERH64 6 # include <asm/tlb_64.h> 7 #endif 8 9 #ifndef __ASSEMBLY__ 10 #include <linux/pagemap.h> 11 12 #ifdef CONFIG_MMU 13 #include <linux/swap.h> 14 #include <asm/pgalloc.h> 15 #include <asm/tlbflush.h> 16 #include <asm/mmu_context.h> 17 18 /* 19 * TLB handling. This allows us to remove pages from the page 20 * tables, and efficiently handle the TLB issues. 21 */ 22 struct mmu_gather { 23 struct mm_struct *mm; 24 unsigned int fullmm; 25 unsigned long start, end; 26 }; 27 28 static inline void init_tlb_gather(struct mmu_gather *tlb) 29 { 30 tlb->start = TASK_SIZE; 31 tlb->end = 0; 32 33 if (tlb->fullmm) { 34 tlb->start = 0; 35 tlb->end = TASK_SIZE; 36 } 37 } 38 39 static inline void 40 arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, 41 unsigned long start, unsigned long end) 42 { 43 tlb->mm = mm; 44 tlb->start = start; 45 tlb->end = end; 46 tlb->fullmm = !(start | (end+1)); 47 48 init_tlb_gather(tlb); 49 } 50 51 static inline void 52 arch_tlb_finish_mmu(struct mmu_gather *tlb, 53 unsigned long start, unsigned long end, bool force) 54 { 55 if (tlb->fullmm || force) 56 flush_tlb_mm(tlb->mm); 57 58 /* keep the page table cache within bounds */ 59 check_pgt_cache(); 60 } 61 62 static inline void 63 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address) 64 { 65 if (tlb->start > address) 66 tlb->start = address; 67 if (tlb->end < address + PAGE_SIZE) 68 tlb->end = address + PAGE_SIZE; 69 } 70 71 #define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \ 72 tlb_remove_tlb_entry(tlb, ptep, address) 73 74 /* 75 * In the case of tlb vma handling, we can optimise these away in the 76 * case where we're doing a full MM flush. When we're doing a munmap, 77 * the vmas are adjusted to only cover the region to be torn down. 78 */ 79 static inline void 80 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) 81 { 82 if (!tlb->fullmm) 83 flush_cache_range(vma, vma->vm_start, vma->vm_end); 84 } 85 86 static inline void 87 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) 88 { 89 if (!tlb->fullmm && tlb->end) { 90 flush_tlb_range(vma, tlb->start, tlb->end); 91 init_tlb_gather(tlb); 92 } 93 } 94 95 static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) 96 { 97 } 98 99 static inline void tlb_flush_mmu_free(struct mmu_gather *tlb) 100 { 101 } 102 103 static inline void tlb_flush_mmu(struct mmu_gather *tlb) 104 { 105 } 106 107 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) 108 { 109 free_page_and_swap_cache(page); 110 return false; /* avoid calling tlb_flush_mmu */ 111 } 112 113 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) 114 { 115 __tlb_remove_page(tlb, page); 116 } 117 118 static inline bool __tlb_remove_page_size(struct mmu_gather *tlb, 119 struct page *page, int page_size) 120 { 121 return __tlb_remove_page(tlb, page); 122 } 123 124 static inline void tlb_remove_page_size(struct mmu_gather *tlb, 125 struct page *page, int page_size) 126 { 127 return tlb_remove_page(tlb, page); 128 } 129 130 #define tlb_remove_check_page_size_change tlb_remove_check_page_size_change 131 static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb, 132 unsigned int page_size) 133 { 134 } 135 136 #define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep) 137 #define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp) 138 #define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp) 139 140 #define tlb_migrate_finish(mm) do { } while (0) 141 142 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64) 143 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t); 144 extern void tlb_unwire_entry(void); 145 #else 146 static inline void tlb_wire_entry(struct vm_area_struct *vma , 147 unsigned long addr, pte_t pte) 148 { 149 BUG(); 150 } 151 152 static inline void tlb_unwire_entry(void) 153 { 154 BUG(); 155 } 156 #endif 157 158 #else /* CONFIG_MMU */ 159 160 #define tlb_start_vma(tlb, vma) do { } while (0) 161 #define tlb_end_vma(tlb, vma) do { } while (0) 162 #define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0) 163 #define tlb_flush(tlb) do { } while (0) 164 165 #include <asm-generic/tlb.h> 166 167 #endif /* CONFIG_MMU */ 168 #endif /* __ASSEMBLY__ */ 169 #endif /* __ASM_SH_TLB_H */ 170