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 /* Users of the generic TLB shootdown code must declare this storage space. */
26 DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
27
28 static 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
37 static 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 */
53 static inline struct mmu_gather *
54 tlb_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
66 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
67 unsigned long end);
68
69 static inline void
70 tlb_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 */
83 static inline void
84 tlb_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 */
99 static 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
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