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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 | ||
0b4e273f JD |
25 | static 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 | ||
34 | static 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 | ||
ff075d60 | 47 | static inline void |
2b047252 | 48 | tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end) |
0b4e273f | 49 | { |
0b4e273f | 50 | tlb->mm = mm; |
2b047252 LT |
51 | tlb->start = start; |
52 | tlb->end = end; | |
53 | tlb->fullmm = !(start | (end+1)); | |
0b4e273f JD |
54 | |
55 | init_tlb_gather(tlb); | |
0b4e273f JD |
56 | } |
57 | ||
58 | extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, | |
59 | unsigned long end); | |
60 | ||
61 | static inline void | |
ff075d60 | 62 | tlb_flush_mmu(struct mmu_gather *tlb) |
0b4e273f JD |
63 | { |
64 | if (!tlb->need_flush) | |
65 | return; | |
66 | ||
67 | flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end); | |
68 | init_tlb_gather(tlb); | |
69 | } | |
70 | ||
71 | /* tlb_finish_mmu | |
72 | * Called at the end of the shootdown operation to free up any resources | |
73 | * that were required. | |
74 | */ | |
75 | static inline void | |
76 | tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) | |
77 | { | |
ff075d60 | 78 | tlb_flush_mmu(tlb); |
0b4e273f JD |
79 | |
80 | /* keep the page table cache within bounds */ | |
81 | check_pgt_cache(); | |
0b4e273f JD |
82 | } |
83 | ||
84 | /* tlb_remove_page | |
85 | * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), | |
86 | * while handling the additional races in SMP caused by other CPUs | |
87 | * caching valid mappings in their TLBs. | |
88 | */ | |
ff075d60 | 89 | static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) |
0b4e273f JD |
90 | { |
91 | tlb->need_flush = 1; | |
92 | free_page_and_swap_cache(page); | |
ff075d60 PZ |
93 | return 1; /* avoid calling tlb_flush_mmu */ |
94 | } | |
95 | ||
96 | static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) | |
97 | { | |
98 | __tlb_remove_page(tlb, page); | |
0b4e273f JD |
99 | } |
100 | ||
101 | /** | |
102 | * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. | |
103 | * | |
104 | * Record the fact that pte's were really umapped in ->need_flush, so we can | |
105 | * later optimise away the tlb invalidate. This helps when userspace is | |
106 | * unmapping already-unmapped pages, which happens quite a lot. | |
107 | */ | |
108 | #define tlb_remove_tlb_entry(tlb, ptep, address) \ | |
109 | do { \ | |
110 | tlb->need_flush = 1; \ | |
111 | __tlb_remove_tlb_entry(tlb, ptep, address); \ | |
112 | } while (0) | |
113 | ||
9e1b32ca | 114 | #define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr) |
0b4e273f | 115 | |
9e1b32ca | 116 | #define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr) |
0b4e273f | 117 | |
9e1b32ca | 118 | #define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr) |
0b4e273f JD |
119 | |
120 | #define tlb_migrate_finish(mm) do {} while (0) | |
1da177e4 LT |
121 | |
122 | #endif |