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 25static 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 34static 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 47static inline void 48tlb_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 58extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, 59 unsigned long end); 60 61static inline void 62tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) 63{ 64 flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end); 65} 66 67static inline void 68tlb_flush_mmu_free(struct mmu_gather *tlb) 69{ 70 init_tlb_gather(tlb); 71} 72 73static inline void 74tlb_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 */ 87static inline void 88tlb_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 */ 101static 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 1; /* avoid calling tlb_flush_mmu */ 106} 107 108static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) 109{ 110 __tlb_remove_page(tlb, page); 111} 112 113/** 114 * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. 115 * 116 * Record the fact that pte's were really umapped in ->need_flush, so we can 117 * later optimise away the tlb invalidate. This helps when userspace is 118 * unmapping already-unmapped pages, which happens quite a lot. 119 */ 120#define tlb_remove_tlb_entry(tlb, ptep, address) \ 121 do { \ 122 tlb->need_flush = 1; \ 123 __tlb_remove_tlb_entry(tlb, ptep, address); \ 124 } while (0) 125 126#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr) 127 128#define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr) 129 130#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr) 131 132#define tlb_migrate_finish(mm) do {} while (0) 133 134#endif 135