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 */ 17struct 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/* Users of the generic TLB shootdown code must declare this storage space. */ 26DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); 27 28static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, 29 unsigned long address) 30{ 31 if (tlb->start > address) 32 tlb->start = address; 33 if (tlb->end < address + PAGE_SIZE) 34 tlb->end = address + PAGE_SIZE; 35} 36 37static inline void init_tlb_gather(struct mmu_gather *tlb) 38{ 39 tlb->need_flush = 0; 40 41 tlb->start = TASK_SIZE; 42 tlb->end = 0; 43 44 if (tlb->fullmm) { 45 tlb->start = 0; 46 tlb->end = TASK_SIZE; 47 } 48} 49 50/* tlb_gather_mmu 51 * Return a pointer to an initialized struct mmu_gather. 52 */ 53static inline struct mmu_gather * 54tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) 55{ 56 struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); 57 58 tlb->mm = mm; 59 tlb->fullmm = full_mm_flush; 60 61 init_tlb_gather(tlb); 62 63 return tlb; 64} 65 66extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, 67 unsigned long end); 68 69static inline void 70tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) 71{ 72 if (!tlb->need_flush) 73 return; 74 75 flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end); 76 init_tlb_gather(tlb); 77} 78 79/* tlb_finish_mmu 80 * Called at the end of the shootdown operation to free up any resources 81 * that were required. 82 */ 83static inline void 84tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) 85{ 86 tlb_flush_mmu(tlb, start, end); 87 88 /* keep the page table cache within bounds */ 89 check_pgt_cache(); 90 91 put_cpu_var(mmu_gathers); 92} 93 94/* tlb_remove_page 95 * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), 96 * while handling the additional races in SMP caused by other CPUs 97 * caching valid mappings in their TLBs. 98 */ 99static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) 100{ 101 tlb->need_flush = 1; 102 free_page_and_swap_cache(page); 103 return; 104} 105 106/** 107 * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. 108 * 109 * Record the fact that pte's were really umapped in ->need_flush, so we can 110 * later optimise away the tlb invalidate. This helps when userspace is 111 * unmapping already-unmapped pages, which happens quite a lot. 112 */ 113#define tlb_remove_tlb_entry(tlb, ptep, address) \ 114 do { \ 115 tlb->need_flush = 1; \ 116 __tlb_remove_tlb_entry(tlb, ptep, address); \ 117 } while (0) 118 119#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr) 120 121#define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr) 122 123#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr) 124 125#define tlb_migrate_finish(mm) do {} while (0) 126 127#endif 128