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