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 tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end) 49 { 50 tlb->mm = mm; 51 tlb->start = start; 52 tlb->end = end; 53 tlb->fullmm = !(start | (end+1)); 54 55 init_tlb_gather(tlb); 56 } 57 58 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, 59 unsigned long end); 60 61 static inline void 62 tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) 63 { 64 flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end); 65 } 66 67 static inline void 68 tlb_flush_mmu_free(struct mmu_gather *tlb) 69 { 70 init_tlb_gather(tlb); 71 } 72 73 static inline void 74 tlb_flush_mmu(struct mmu_gather *tlb) 75 { 76 if (!tlb->need_flush) 77 return; 78 79 tlb_flush_mmu_tlbonly(tlb); 80 tlb_flush_mmu_free(tlb); 81 } 82 83 /* tlb_finish_mmu 84 * Called at the end of the shootdown operation to free up any resources 85 * that were required. 86 */ 87 static inline void 88 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) 89 { 90 tlb_flush_mmu(tlb); 91 92 /* keep the page table cache within bounds */ 93 check_pgt_cache(); 94 } 95 96 /* tlb_remove_page 97 * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), 98 * while handling the additional races in SMP caused by other CPUs 99 * caching valid mappings in their TLBs. 100 */ 101 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) 102 { 103 tlb->need_flush = 1; 104 free_page_and_swap_cache(page); 105 return false; /* avoid calling tlb_flush_mmu */ 106 } 107 108 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) 109 { 110 __tlb_remove_page(tlb, page); 111 } 112 113 static inline bool __tlb_remove_page_size(struct mmu_gather *tlb, 114 struct page *page, int page_size) 115 { 116 return __tlb_remove_page(tlb, page); 117 } 118 119 static inline void tlb_remove_page_size(struct mmu_gather *tlb, 120 struct page *page, int page_size) 121 { 122 return tlb_remove_page(tlb, page); 123 } 124 125 /** 126 * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. 127 * 128 * Record the fact that pte's were really umapped in ->need_flush, so we can 129 * later optimise away the tlb invalidate. This helps when userspace is 130 * unmapping already-unmapped pages, which happens quite a lot. 131 */ 132 #define tlb_remove_tlb_entry(tlb, ptep, address) \ 133 do { \ 134 tlb->need_flush = 1; \ 135 __tlb_remove_tlb_entry(tlb, ptep, address); \ 136 } while (0) 137 138 #define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \ 139 tlb_remove_tlb_entry(tlb, ptep, address) 140 141 #define tlb_remove_check_page_size_change tlb_remove_check_page_size_change 142 static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb, 143 unsigned int page_size) 144 { 145 } 146 147 #define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr) 148 149 #define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr) 150 151 #define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr) 152 153 #define tlb_migrate_finish(mm) do {} while (0) 154 155 #endif 156