1 #ifndef __UM_TLB_H 2 #define __UM_TLB_H 3 4 #include <linux/pagemap.h> 5 #include <linux/swap.h> 6 #include <asm/percpu.h> 7 #include <asm/pgalloc.h> 8 #include <asm/tlbflush.h> 9 10 #define tlb_start_vma(tlb, vma) do { } while (0) 11 #define tlb_end_vma(tlb, vma) do { } while (0) 12 #define tlb_flush(tlb) flush_tlb_mm((tlb)->mm) 13 14 /* struct mmu_gather is an opaque type used by the mm code for passing around 15 * any data needed by arch specific code for tlb_remove_page. 16 */ 17 struct mmu_gather { 18 struct mm_struct *mm; 19 unsigned int need_flush; /* Really unmapped some ptes? */ 20 unsigned long start; 21 unsigned long end; 22 unsigned int fullmm; /* non-zero means full mm flush */ 23 }; 24 25 static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, 26 unsigned long address) 27 { 28 if (tlb->start > address) 29 tlb->start = address; 30 if (tlb->end < address + PAGE_SIZE) 31 tlb->end = address + PAGE_SIZE; 32 } 33 34 static inline void init_tlb_gather(struct mmu_gather *tlb) 35 { 36 tlb->need_flush = 0; 37 38 tlb->start = TASK_SIZE; 39 tlb->end = 0; 40 41 if (tlb->fullmm) { 42 tlb->start = 0; 43 tlb->end = TASK_SIZE; 44 } 45 } 46 47 static inline void 48 arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, 49 unsigned long start, unsigned long end) 50 { 51 tlb->mm = mm; 52 tlb->start = start; 53 tlb->end = end; 54 tlb->fullmm = !(start | (end+1)); 55 56 init_tlb_gather(tlb); 57 } 58 59 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, 60 unsigned long end); 61 62 static inline void 63 tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) 64 { 65 flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end); 66 } 67 68 static inline void 69 tlb_flush_mmu_free(struct mmu_gather *tlb) 70 { 71 init_tlb_gather(tlb); 72 } 73 74 static inline void 75 tlb_flush_mmu(struct mmu_gather *tlb) 76 { 77 if (!tlb->need_flush) 78 return; 79 80 tlb_flush_mmu_tlbonly(tlb); 81 tlb_flush_mmu_free(tlb); 82 } 83 84 /* arch_tlb_finish_mmu 85 * Called at the end of the shootdown operation to free up any resources 86 * that were required. 87 */ 88 static inline void 89 arch_tlb_finish_mmu(struct mmu_gather *tlb, 90 unsigned long start, unsigned long end, bool force) 91 { 92 if (force) { 93 tlb->start = start; 94 tlb->end = end; 95 tlb->need_flush = 1; 96 } 97 tlb_flush_mmu(tlb); 98 99 /* keep the page table cache within bounds */ 100 check_pgt_cache(); 101 } 102 103 /* tlb_remove_page 104 * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), 105 * while handling the additional races in SMP caused by other CPUs 106 * caching valid mappings in their TLBs. 107 */ 108 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) 109 { 110 tlb->need_flush = 1; 111 free_page_and_swap_cache(page); 112 return false; /* avoid calling tlb_flush_mmu */ 113 } 114 115 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) 116 { 117 __tlb_remove_page(tlb, page); 118 } 119 120 static inline bool __tlb_remove_page_size(struct mmu_gather *tlb, 121 struct page *page, int page_size) 122 { 123 return __tlb_remove_page(tlb, page); 124 } 125 126 static inline void tlb_remove_page_size(struct mmu_gather *tlb, 127 struct page *page, int page_size) 128 { 129 return tlb_remove_page(tlb, page); 130 } 131 132 /** 133 * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. 134 * 135 * Record the fact that pte's were really umapped in ->need_flush, so we can 136 * later optimise away the tlb invalidate. This helps when userspace is 137 * unmapping already-unmapped pages, which happens quite a lot. 138 */ 139 #define tlb_remove_tlb_entry(tlb, ptep, address) \ 140 do { \ 141 tlb->need_flush = 1; \ 142 __tlb_remove_tlb_entry(tlb, ptep, address); \ 143 } while (0) 144 145 #define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \ 146 tlb_remove_tlb_entry(tlb, ptep, address) 147 148 #define tlb_remove_check_page_size_change tlb_remove_check_page_size_change 149 static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb, 150 unsigned int page_size) 151 { 152 } 153 154 #define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr) 155 156 #define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr) 157 158 #define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr) 159 160 #define tlb_migrate_finish(mm) do {} while (0) 161 162 #endif 163