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1da177e4 LT |
1 | #ifndef __UM_TLB_H |
2 | #define __UM_TLB_H | |
3 | ||
1f4deba8 | 4 | #include <linux/pagemap.h> |
0b4e273f JD |
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) __pte_free_tlb(tlb, ptep) | |
120 | ||
121 | #define pud_free_tlb(tlb, pudp) __pud_free_tlb(tlb, pudp) | |
122 | ||
123 | #define pmd_free_tlb(tlb, pmdp) __pmd_free_tlb(tlb, pmdp) | |
124 | ||
125 | #define tlb_migrate_finish(mm) do {} while (0) | |
1da177e4 LT |
126 | |
127 | #endif |