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-rw-r--r--include/asm-um/tlb.h122
1 files changed, 121 insertions, 1 deletions
diff --git a/include/asm-um/tlb.h b/include/asm-um/tlb.h
index c640033bc1fd..39fc475df6c9 100644
--- a/include/asm-um/tlb.h
+++ b/include/asm-um/tlb.h
@@ -1,6 +1,126 @@
1#ifndef __UM_TLB_H 1#ifndef __UM_TLB_H
2#define __UM_TLB_H 2#define __UM_TLB_H
3 3
4#include <asm/arch/tlb.h> 4#include <linux/swap.h>
5#include <asm/percpu.h>
6#include <asm/pgalloc.h>
7#include <asm/tlbflush.h>
8
9#define tlb_start_vma(tlb, vma) do { } while (0)
10#define tlb_end_vma(tlb, vma) do { } while (0)
11#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
12
13/* struct mmu_gather is an opaque type used by the mm code for passing around
14 * any data needed by arch specific code for tlb_remove_page.
15 */
16struct mmu_gather {
17 struct mm_struct *mm;
18 unsigned int need_flush; /* Really unmapped some ptes? */
19 unsigned long start;
20 unsigned long end;
21 unsigned int fullmm; /* non-zero means full mm flush */
22};
23
24/* Users of the generic TLB shootdown code must declare this storage space. */
25DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
26
27static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
28 unsigned long address)
29{
30 if (tlb->start > address)
31 tlb->start = address;
32 if (tlb->end < address + PAGE_SIZE)
33 tlb->end = address + PAGE_SIZE;
34}
35
36static inline void init_tlb_gather(struct mmu_gather *tlb)
37{
38 tlb->need_flush = 0;
39
40 tlb->start = TASK_SIZE;
41 tlb->end = 0;
42
43 if (tlb->fullmm) {
44 tlb->start = 0;
45 tlb->end = TASK_SIZE;
46 }
47}
48
49/* tlb_gather_mmu
50 * Return a pointer to an initialized struct mmu_gather.
51 */
52static inline struct mmu_gather *
53tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
54{
55 struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
56
57 tlb->mm = mm;
58 tlb->fullmm = full_mm_flush;
59
60 init_tlb_gather(tlb);
61
62 return tlb;
63}
64
65extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
66 unsigned long end);
67
68static inline void
69tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
70{
71 if (!tlb->need_flush)
72 return;
73
74 flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
75 init_tlb_gather(tlb);
76}
77
78/* tlb_finish_mmu
79 * Called at the end of the shootdown operation to free up any resources
80 * that were required.
81 */
82static inline void
83tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
84{
85 tlb_flush_mmu(tlb, start, end);
86
87 /* keep the page table cache within bounds */
88 check_pgt_cache();
89
90 put_cpu_var(mmu_gathers);
91}
92
93/* tlb_remove_page
94 * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)),
95 * while handling the additional races in SMP caused by other CPUs
96 * caching valid mappings in their TLBs.
97 */
98static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
99{
100 tlb->need_flush = 1;
101 free_page_and_swap_cache(page);
102 return;
103}
104
105/**
106 * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
107 *
108 * Record the fact that pte's were really umapped in ->need_flush, so we can
109 * later optimise away the tlb invalidate. This helps when userspace is
110 * unmapping already-unmapped pages, which happens quite a lot.
111 */
112#define tlb_remove_tlb_entry(tlb, ptep, address) \
113 do { \
114 tlb->need_flush = 1; \
115 __tlb_remove_tlb_entry(tlb, ptep, address); \
116 } while (0)
117
118#define pte_free_tlb(tlb, ptep) __pte_free_tlb(tlb, ptep)
119
120#define pud_free_tlb(tlb, pudp) __pud_free_tlb(tlb, pudp)
121
122#define pmd_free_tlb(tlb, pmdp) __pmd_free_tlb(tlb, pmdp)
123
124#define tlb_migrate_finish(mm) do {} while (0)
5 125
6#endif 126#endif