Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef __UM_TLB_H |
2 | #define __UM_TLB_H | |
3 | ||
0b4e273f JD |
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 | */ | |
16 | struct 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. */ | |
25 | DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); | |
26 | ||
27 | static 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 | ||
36 | static 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 | */ | |
52 | static inline struct mmu_gather * | |
53 | tlb_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 | ||
65 | extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, | |
66 | unsigned long end); | |
67 | ||
68 | static inline void | |
69 | tlb_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 | */ | |
82 | static inline void | |
83 | tlb_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 | */ | |
98 | static 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) | |
1da177e4 LT |
125 | |
126 | #endif |