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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __UM_TLB_H |
3 | #define __UM_TLB_H | |
4 | ||
1f4deba8 | 5 | #include <linux/pagemap.h> |
0b4e273f JD |
6 | #include <linux/swap.h> |
7 | #include <asm/percpu.h> | |
8 | #include <asm/pgalloc.h> | |
9 | #include <asm/tlbflush.h> | |
10 | ||
11 | #define tlb_start_vma(tlb, vma) do { } while (0) | |
12 | #define tlb_end_vma(tlb, vma) do { } while (0) | |
13 | #define tlb_flush(tlb) flush_tlb_mm((tlb)->mm) | |
14 | ||
15 | /* struct mmu_gather is an opaque type used by the mm code for passing around | |
16 | * any data needed by arch specific code for tlb_remove_page. | |
17 | */ | |
18 | struct mmu_gather { | |
19 | struct mm_struct *mm; | |
20 | unsigned int need_flush; /* Really unmapped some ptes? */ | |
21 | unsigned long start; | |
22 | unsigned long end; | |
23 | unsigned int fullmm; /* non-zero means full mm flush */ | |
24 | }; | |
25 | ||
0b4e273f JD |
26 | static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, |
27 | unsigned long address) | |
28 | { | |
29 | if (tlb->start > address) | |
30 | tlb->start = address; | |
31 | if (tlb->end < address + PAGE_SIZE) | |
32 | tlb->end = address + PAGE_SIZE; | |
33 | } | |
34 | ||
35 | static inline void init_tlb_gather(struct mmu_gather *tlb) | |
36 | { | |
37 | tlb->need_flush = 0; | |
38 | ||
39 | tlb->start = TASK_SIZE; | |
40 | tlb->end = 0; | |
41 | ||
42 | if (tlb->fullmm) { | |
43 | tlb->start = 0; | |
44 | tlb->end = TASK_SIZE; | |
45 | } | |
46 | } | |
47 | ||
ff075d60 | 48 | static inline void |
56236a59 MK |
49 | arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, |
50 | unsigned long start, unsigned long end) | |
0b4e273f | 51 | { |
0b4e273f | 52 | tlb->mm = mm; |
2b047252 LT |
53 | tlb->start = start; |
54 | tlb->end = end; | |
55 | tlb->fullmm = !(start | (end+1)); | |
0b4e273f JD |
56 | |
57 | init_tlb_gather(tlb); | |
0b4e273f JD |
58 | } |
59 | ||
60 | extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, | |
61 | unsigned long end); | |
62 | ||
1cf35d47 LT |
63 | static inline void |
64 | tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) | |
65 | { | |
66 | flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end); | |
67 | } | |
68 | ||
69 | static inline void | |
70 | tlb_flush_mmu_free(struct mmu_gather *tlb) | |
71 | { | |
72 | init_tlb_gather(tlb); | |
73 | } | |
74 | ||
0b4e273f | 75 | static inline void |
ff075d60 | 76 | tlb_flush_mmu(struct mmu_gather *tlb) |
0b4e273f JD |
77 | { |
78 | if (!tlb->need_flush) | |
79 | return; | |
80 | ||
1cf35d47 LT |
81 | tlb_flush_mmu_tlbonly(tlb); |
82 | tlb_flush_mmu_free(tlb); | |
0b4e273f JD |
83 | } |
84 | ||
56236a59 | 85 | /* arch_tlb_finish_mmu |
0b4e273f JD |
86 | * Called at the end of the shootdown operation to free up any resources |
87 | * that were required. | |
88 | */ | |
89 | static inline void | |
56236a59 | 90 | arch_tlb_finish_mmu(struct mmu_gather *tlb, |
99baac21 | 91 | unsigned long start, unsigned long end, bool force) |
0b4e273f | 92 | { |
99baac21 MK |
93 | if (force) { |
94 | tlb->start = start; | |
95 | tlb->end = end; | |
96 | tlb->need_flush = 1; | |
97 | } | |
ff075d60 | 98 | tlb_flush_mmu(tlb); |
0b4e273f JD |
99 | |
100 | /* keep the page table cache within bounds */ | |
101 | check_pgt_cache(); | |
0b4e273f JD |
102 | } |
103 | ||
104 | /* tlb_remove_page | |
105 | * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), | |
106 | * while handling the additional races in SMP caused by other CPUs | |
107 | * caching valid mappings in their TLBs. | |
108 | */ | |
ff075d60 | 109 | static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) |
0b4e273f JD |
110 | { |
111 | tlb->need_flush = 1; | |
112 | free_page_and_swap_cache(page); | |
e9d55e15 | 113 | return false; /* avoid calling tlb_flush_mmu */ |
ff075d60 PZ |
114 | } |
115 | ||
116 | static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) | |
117 | { | |
118 | __tlb_remove_page(tlb, page); | |
0b4e273f JD |
119 | } |
120 | ||
e77b0852 AK |
121 | static inline bool __tlb_remove_page_size(struct mmu_gather *tlb, |
122 | struct page *page, int page_size) | |
123 | { | |
124 | return __tlb_remove_page(tlb, page); | |
125 | } | |
126 | ||
e77b0852 AK |
127 | static inline void tlb_remove_page_size(struct mmu_gather *tlb, |
128 | struct page *page, int page_size) | |
129 | { | |
130 | return tlb_remove_page(tlb, page); | |
131 | } | |
132 | ||
0b4e273f JD |
133 | /** |
134 | * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. | |
135 | * | |
136 | * Record the fact that pte's were really umapped in ->need_flush, so we can | |
137 | * later optimise away the tlb invalidate. This helps when userspace is | |
138 | * unmapping already-unmapped pages, which happens quite a lot. | |
139 | */ | |
140 | #define tlb_remove_tlb_entry(tlb, ptep, address) \ | |
141 | do { \ | |
142 | tlb->need_flush = 1; \ | |
143 | __tlb_remove_tlb_entry(tlb, ptep, address); \ | |
144 | } while (0) | |
145 | ||
b528e4b6 AK |
146 | #define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \ |
147 | tlb_remove_tlb_entry(tlb, ptep, address) | |
148 | ||
07e32661 AK |
149 | #define tlb_remove_check_page_size_change tlb_remove_check_page_size_change |
150 | static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb, | |
151 | unsigned int page_size) | |
152 | { | |
153 | } | |
154 | ||
9e1b32ca | 155 | #define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr) |
0b4e273f | 156 | |
9e1b32ca | 157 | #define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr) |
0b4e273f | 158 | |
9e1b32ca | 159 | #define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr) |
0b4e273f JD |
160 | |
161 | #define tlb_migrate_finish(mm) do {} while (0) | |
1da177e4 LT |
162 | |
163 | #endif |