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03b505ea RK |
1 | /* |
2 | * linux/arch/arm/kernel/smp_tlb.c | |
3 | * | |
4 | * Copyright (C) 2002 ARM Limited, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/preempt.h> | |
11 | #include <linux/smp.h> | |
12 | ||
13 | #include <asm/smp_plat.h> | |
14 | #include <asm/tlbflush.h> | |
93dc6887 | 15 | #include <asm/mmu_context.h> |
03b505ea | 16 | |
03b505ea RK |
17 | /**********************************************************************/ |
18 | ||
19 | /* | |
20 | * TLB operations | |
21 | */ | |
22 | struct tlb_args { | |
23 | struct vm_area_struct *ta_vma; | |
24 | unsigned long ta_start; | |
25 | unsigned long ta_end; | |
26 | }; | |
27 | ||
28 | static inline void ipi_flush_tlb_all(void *ignored) | |
29 | { | |
30 | local_flush_tlb_all(); | |
31 | } | |
32 | ||
33 | static inline void ipi_flush_tlb_mm(void *arg) | |
34 | { | |
35 | struct mm_struct *mm = (struct mm_struct *)arg; | |
36 | ||
37 | local_flush_tlb_mm(mm); | |
38 | } | |
39 | ||
40 | static inline void ipi_flush_tlb_page(void *arg) | |
41 | { | |
42 | struct tlb_args *ta = (struct tlb_args *)arg; | |
43 | ||
44 | local_flush_tlb_page(ta->ta_vma, ta->ta_start); | |
45 | } | |
46 | ||
47 | static inline void ipi_flush_tlb_kernel_page(void *arg) | |
48 | { | |
49 | struct tlb_args *ta = (struct tlb_args *)arg; | |
50 | ||
51 | local_flush_tlb_kernel_page(ta->ta_start); | |
52 | } | |
53 | ||
54 | static inline void ipi_flush_tlb_range(void *arg) | |
55 | { | |
56 | struct tlb_args *ta = (struct tlb_args *)arg; | |
57 | ||
58 | local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end); | |
59 | } | |
60 | ||
61 | static inline void ipi_flush_tlb_kernel_range(void *arg) | |
62 | { | |
63 | struct tlb_args *ta = (struct tlb_args *)arg; | |
64 | ||
65 | local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end); | |
66 | } | |
67 | ||
862c588f WD |
68 | static inline void ipi_flush_bp_all(void *ignored) |
69 | { | |
70 | local_flush_bp_all(); | |
71 | } | |
72 | ||
93dc6887 CM |
73 | #ifdef CONFIG_ARM_ERRATA_798181 |
74 | static int erratum_a15_798181(void) | |
75 | { | |
76 | unsigned int midr = read_cpuid_id(); | |
77 | ||
78 | /* Cortex-A15 r0p0..r3p2 affected */ | |
79 | if ((midr & 0xff0ffff0) != 0x410fc0f0 || midr > 0x413fc0f2) | |
80 | return 0; | |
81 | return 1; | |
82 | } | |
83 | #else | |
84 | static int erratum_a15_798181(void) | |
85 | { | |
86 | return 0; | |
87 | } | |
88 | #endif | |
89 | ||
90 | static void ipi_flush_tlb_a15_erratum(void *arg) | |
91 | { | |
92 | dmb(); | |
93 | } | |
94 | ||
95 | static void broadcast_tlb_a15_erratum(void) | |
96 | { | |
97 | if (!erratum_a15_798181()) | |
98 | return; | |
99 | ||
100 | dummy_flush_tlb_a15_erratum(); | |
3eb0be30 | 101 | smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1); |
93dc6887 CM |
102 | } |
103 | ||
104 | static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm) | |
105 | { | |
0d0752bc | 106 | int this_cpu; |
93dc6887 CM |
107 | cpumask_t mask = { CPU_BITS_NONE }; |
108 | ||
109 | if (!erratum_a15_798181()) | |
110 | return; | |
111 | ||
112 | dummy_flush_tlb_a15_erratum(); | |
3eb0be30 | 113 | this_cpu = get_cpu(); |
0d0752bc | 114 | a15_erratum_get_cpumask(this_cpu, mm, &mask); |
93dc6887 | 115 | smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1); |
3eb0be30 | 116 | put_cpu(); |
93dc6887 CM |
117 | } |
118 | ||
03b505ea RK |
119 | void flush_tlb_all(void) |
120 | { | |
121 | if (tlb_ops_need_broadcast()) | |
122 | on_each_cpu(ipi_flush_tlb_all, NULL, 1); | |
123 | else | |
124 | local_flush_tlb_all(); | |
93dc6887 | 125 | broadcast_tlb_a15_erratum(); |
03b505ea RK |
126 | } |
127 | ||
128 | void flush_tlb_mm(struct mm_struct *mm) | |
129 | { | |
130 | if (tlb_ops_need_broadcast()) | |
3fc498f1 | 131 | on_each_cpu_mask(mm_cpumask(mm), ipi_flush_tlb_mm, mm, 1); |
03b505ea RK |
132 | else |
133 | local_flush_tlb_mm(mm); | |
93dc6887 | 134 | broadcast_tlb_mm_a15_erratum(mm); |
03b505ea RK |
135 | } |
136 | ||
137 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) | |
138 | { | |
139 | if (tlb_ops_need_broadcast()) { | |
140 | struct tlb_args ta; | |
141 | ta.ta_vma = vma; | |
142 | ta.ta_start = uaddr; | |
3fc498f1 GBY |
143 | on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page, |
144 | &ta, 1); | |
03b505ea RK |
145 | } else |
146 | local_flush_tlb_page(vma, uaddr); | |
93dc6887 | 147 | broadcast_tlb_mm_a15_erratum(vma->vm_mm); |
03b505ea RK |
148 | } |
149 | ||
150 | void flush_tlb_kernel_page(unsigned long kaddr) | |
151 | { | |
152 | if (tlb_ops_need_broadcast()) { | |
153 | struct tlb_args ta; | |
154 | ta.ta_start = kaddr; | |
155 | on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1); | |
156 | } else | |
157 | local_flush_tlb_kernel_page(kaddr); | |
93dc6887 | 158 | broadcast_tlb_a15_erratum(); |
03b505ea RK |
159 | } |
160 | ||
161 | void flush_tlb_range(struct vm_area_struct *vma, | |
162 | unsigned long start, unsigned long end) | |
163 | { | |
164 | if (tlb_ops_need_broadcast()) { | |
165 | struct tlb_args ta; | |
166 | ta.ta_vma = vma; | |
167 | ta.ta_start = start; | |
168 | ta.ta_end = end; | |
3fc498f1 GBY |
169 | on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_range, |
170 | &ta, 1); | |
03b505ea RK |
171 | } else |
172 | local_flush_tlb_range(vma, start, end); | |
93dc6887 | 173 | broadcast_tlb_mm_a15_erratum(vma->vm_mm); |
03b505ea RK |
174 | } |
175 | ||
176 | void flush_tlb_kernel_range(unsigned long start, unsigned long end) | |
177 | { | |
178 | if (tlb_ops_need_broadcast()) { | |
179 | struct tlb_args ta; | |
180 | ta.ta_start = start; | |
181 | ta.ta_end = end; | |
182 | on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1); | |
183 | } else | |
184 | local_flush_tlb_kernel_range(start, end); | |
93dc6887 | 185 | broadcast_tlb_a15_erratum(); |
03b505ea RK |
186 | } |
187 | ||
862c588f WD |
188 | void flush_bp_all(void) |
189 | { | |
190 | if (tlb_ops_need_broadcast()) | |
191 | on_each_cpu(ipi_flush_bp_all, NULL, 1); | |
192 | else | |
193 | local_flush_bp_all(); | |
194 | } |