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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>
15#include <asm/mmu_context.h>
16
17/**********************************************************************/
18
19/*
20 * TLB operations
21 */
22struct tlb_args {
23 struct vm_area_struct *ta_vma;
24 unsigned long ta_start;
25 unsigned long ta_end;
26};
27
28static inline void ipi_flush_tlb_all(void *ignored)
29{
30 local_flush_tlb_all();
31}
32
33static 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
40static 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
47static 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
54static 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
61static 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
68static inline void ipi_flush_bp_all(void *ignored)
69{
70 local_flush_bp_all();
71}
72
73#ifdef CONFIG_ARM_ERRATA_798181
74bool (*erratum_a15_798181_handler)(void);
75
76static bool erratum_a15_798181_partial(void)
77{
78 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0));
79 dsb(ish);
80 return false;
81}
82
83static bool erratum_a15_798181_broadcast(void)
84{
85 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0));
86 dsb(ish);
87 return true;
88}
89
90void erratum_a15_798181_init(void)
91{
92 unsigned int midr = read_cpuid_id();
93 unsigned int revidr = read_cpuid(CPUID_REVIDR);
94
95 /* Brahma-B15 r0p0..r0p2 affected
96 * Cortex-A15 r0p0..r3p2 w/o ECO fix affected */
97 if ((midr & 0xff0ffff0) == 0x420f00f0 && midr <= 0x420f00f2)
98 erratum_a15_798181_handler = erratum_a15_798181_broadcast;
99 else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr <= 0x413fc0f2 &&
100 (revidr & 0x210) != 0x210) {
101 if (revidr & 0x10)
102 erratum_a15_798181_handler =
103 erratum_a15_798181_partial;
104 else
105 erratum_a15_798181_handler =
106 erratum_a15_798181_broadcast;
107 }
108}
109#endif
110
111static void ipi_flush_tlb_a15_erratum(void *arg)
112{
113 dmb();
114}
115
116static void broadcast_tlb_a15_erratum(void)
117{
118 if (!erratum_a15_798181())
119 return;
120
121 smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1);
122}
123
124static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm)
125{
126 int this_cpu;
127 cpumask_t mask = { CPU_BITS_NONE };
128
129 if (!erratum_a15_798181())
130 return;
131
132 this_cpu = get_cpu();
133 a15_erratum_get_cpumask(this_cpu, mm, &mask);
134 smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1);
135 put_cpu();
136}
137
138void flush_tlb_all(void)
139{
140 if (tlb_ops_need_broadcast())
141 on_each_cpu(ipi_flush_tlb_all, NULL, 1);
142 else
143 __flush_tlb_all();
144 broadcast_tlb_a15_erratum();
145}
146
147void flush_tlb_mm(struct mm_struct *mm)
148{
149 if (tlb_ops_need_broadcast())
150 on_each_cpu_mask(mm_cpumask(mm), ipi_flush_tlb_mm, mm, 1);
151 else
152 __flush_tlb_mm(mm);
153 broadcast_tlb_mm_a15_erratum(mm);
154}
155
156void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
157{
158 if (tlb_ops_need_broadcast()) {
159 struct tlb_args ta;
160 ta.ta_vma = vma;
161 ta.ta_start = uaddr;
162 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page,
163 &ta, 1);
164 } else
165 __flush_tlb_page(vma, uaddr);
166 broadcast_tlb_mm_a15_erratum(vma->vm_mm);
167}
168
169void flush_tlb_kernel_page(unsigned long kaddr)
170{
171 if (tlb_ops_need_broadcast()) {
172 struct tlb_args ta;
173 ta.ta_start = kaddr;
174 on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
175 } else
176 __flush_tlb_kernel_page(kaddr);
177 broadcast_tlb_a15_erratum();
178}
179
180void flush_tlb_range(struct vm_area_struct *vma,
181 unsigned long start, unsigned long end)
182{
183 if (tlb_ops_need_broadcast()) {
184 struct tlb_args ta;
185 ta.ta_vma = vma;
186 ta.ta_start = start;
187 ta.ta_end = end;
188 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_range,
189 &ta, 1);
190 } else
191 local_flush_tlb_range(vma, start, end);
192 broadcast_tlb_mm_a15_erratum(vma->vm_mm);
193}
194
195void flush_tlb_kernel_range(unsigned long start, unsigned long end)
196{
197 if (tlb_ops_need_broadcast()) {
198 struct tlb_args ta;
199 ta.ta_start = start;
200 ta.ta_end = end;
201 on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
202 } else
203 local_flush_tlb_kernel_range(start, end);
204 broadcast_tlb_a15_erratum();
205}
206
207void flush_bp_all(void)
208{
209 if (tlb_ops_need_broadcast())
210 on_each_cpu(ipi_flush_bp_all, NULL, 1);
211 else
212 __flush_bp_all();
213}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/kernel/smp_tlb.c
4 *
5 * Copyright (C) 2002 ARM Limited, All Rights Reserved.
6 */
7#include <linux/preempt.h>
8#include <linux/smp.h>
9#include <linux/uaccess.h>
10
11#include <asm/smp_plat.h>
12#include <asm/tlbflush.h>
13#include <asm/mmu_context.h>
14
15/**********************************************************************/
16
17/*
18 * TLB operations
19 */
20struct tlb_args {
21 struct vm_area_struct *ta_vma;
22 unsigned long ta_start;
23 unsigned long ta_end;
24};
25
26static inline void ipi_flush_tlb_all(void *ignored)
27{
28 local_flush_tlb_all();
29}
30
31static inline void ipi_flush_tlb_mm(void *arg)
32{
33 struct mm_struct *mm = (struct mm_struct *)arg;
34
35 local_flush_tlb_mm(mm);
36}
37
38static inline void ipi_flush_tlb_page(void *arg)
39{
40 struct tlb_args *ta = (struct tlb_args *)arg;
41 unsigned int __ua_flags = uaccess_save_and_enable();
42
43 local_flush_tlb_page(ta->ta_vma, ta->ta_start);
44
45 uaccess_restore(__ua_flags);
46}
47
48static inline void ipi_flush_tlb_kernel_page(void *arg)
49{
50 struct tlb_args *ta = (struct tlb_args *)arg;
51
52 local_flush_tlb_kernel_page(ta->ta_start);
53}
54
55static inline void ipi_flush_tlb_range(void *arg)
56{
57 struct tlb_args *ta = (struct tlb_args *)arg;
58 unsigned int __ua_flags = uaccess_save_and_enable();
59
60 local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
61
62 uaccess_restore(__ua_flags);
63}
64
65static inline void ipi_flush_tlb_kernel_range(void *arg)
66{
67 struct tlb_args *ta = (struct tlb_args *)arg;
68
69 local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
70}
71
72static inline void ipi_flush_bp_all(void *ignored)
73{
74 local_flush_bp_all();
75}
76
77#ifdef CONFIG_ARM_ERRATA_798181
78bool (*erratum_a15_798181_handler)(void);
79
80static bool erratum_a15_798181_partial(void)
81{
82 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0));
83 dsb(ish);
84 return false;
85}
86
87static bool erratum_a15_798181_broadcast(void)
88{
89 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0));
90 dsb(ish);
91 return true;
92}
93
94void erratum_a15_798181_init(void)
95{
96 unsigned int midr = read_cpuid_id();
97 unsigned int revidr = read_cpuid(CPUID_REVIDR);
98
99 /* Brahma-B15 r0p0..r0p2 affected
100 * Cortex-A15 r0p0..r3p3 w/o ECO fix affected
101 * Fixes applied to A15 with respect to the revision and revidr are:
102 *
103 * r0p0-r2p1: No fixes applied
104 * r2p2,r2p3:
105 * REVIDR[4]: 798181 Moving a virtual page that is being accessed
106 * by an active process can lead to unexpected behavior
107 * REVIDR[9]: Not defined
108 * r2p4,r3p0,r3p1,r3p2:
109 * REVIDR[4]: 798181 Moving a virtual page that is being accessed
110 * by an active process can lead to unexpected behavior
111 * REVIDR[9]: 798181 Moving a virtual page that is being accessed
112 * by an active process can lead to unexpected behavior
113 * - This is an update to a previously released ECO.
114 * r3p3:
115 * REVIDR[4]: Reserved
116 * REVIDR[9]: 798181 Moving a virtual page that is being accessed
117 * by an active process can lead to unexpected behavior
118 * - This is an update to a previously released ECO.
119 *
120 * Handling:
121 * REVIDR[9] set -> No WA
122 * REVIDR[4] set, REVIDR[9] cleared -> Partial WA
123 * Both cleared -> Full WA
124 */
125 if ((midr & 0xff0ffff0) == 0x420f00f0 && midr <= 0x420f00f2) {
126 erratum_a15_798181_handler = erratum_a15_798181_broadcast;
127 } else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x412fc0f2) {
128 erratum_a15_798181_handler = erratum_a15_798181_broadcast;
129 } else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x412fc0f4) {
130 if (revidr & 0x10)
131 erratum_a15_798181_handler =
132 erratum_a15_798181_partial;
133 else
134 erratum_a15_798181_handler =
135 erratum_a15_798181_broadcast;
136 } else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x413fc0f3) {
137 if ((revidr & 0x210) == 0)
138 erratum_a15_798181_handler =
139 erratum_a15_798181_broadcast;
140 else if (revidr & 0x10)
141 erratum_a15_798181_handler =
142 erratum_a15_798181_partial;
143 } else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x414fc0f0) {
144 if ((revidr & 0x200) == 0)
145 erratum_a15_798181_handler =
146 erratum_a15_798181_partial;
147 }
148}
149#endif
150
151static void ipi_flush_tlb_a15_erratum(void *arg)
152{
153 dmb();
154}
155
156static void broadcast_tlb_a15_erratum(void)
157{
158 if (!erratum_a15_798181())
159 return;
160
161 smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1);
162}
163
164static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm)
165{
166 int this_cpu;
167 cpumask_t mask = { CPU_BITS_NONE };
168
169 if (!erratum_a15_798181())
170 return;
171
172 this_cpu = get_cpu();
173 a15_erratum_get_cpumask(this_cpu, mm, &mask);
174 smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1);
175 put_cpu();
176}
177
178void flush_tlb_all(void)
179{
180 if (tlb_ops_need_broadcast())
181 on_each_cpu(ipi_flush_tlb_all, NULL, 1);
182 else
183 __flush_tlb_all();
184 broadcast_tlb_a15_erratum();
185}
186
187void flush_tlb_mm(struct mm_struct *mm)
188{
189 if (tlb_ops_need_broadcast())
190 on_each_cpu_mask(mm_cpumask(mm), ipi_flush_tlb_mm, mm, 1);
191 else
192 __flush_tlb_mm(mm);
193 broadcast_tlb_mm_a15_erratum(mm);
194}
195
196void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
197{
198 if (tlb_ops_need_broadcast()) {
199 struct tlb_args ta;
200 ta.ta_vma = vma;
201 ta.ta_start = uaddr;
202 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page,
203 &ta, 1);
204 } else
205 __flush_tlb_page(vma, uaddr);
206 broadcast_tlb_mm_a15_erratum(vma->vm_mm);
207}
208
209void flush_tlb_kernel_page(unsigned long kaddr)
210{
211 if (tlb_ops_need_broadcast()) {
212 struct tlb_args ta;
213 ta.ta_start = kaddr;
214 on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
215 } else
216 __flush_tlb_kernel_page(kaddr);
217 broadcast_tlb_a15_erratum();
218}
219
220void flush_tlb_range(struct vm_area_struct *vma,
221 unsigned long start, unsigned long end)
222{
223 if (tlb_ops_need_broadcast()) {
224 struct tlb_args ta;
225 ta.ta_vma = vma;
226 ta.ta_start = start;
227 ta.ta_end = end;
228 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_range,
229 &ta, 1);
230 } else
231 local_flush_tlb_range(vma, start, end);
232 broadcast_tlb_mm_a15_erratum(vma->vm_mm);
233}
234
235void flush_tlb_kernel_range(unsigned long start, unsigned long end)
236{
237 if (tlb_ops_need_broadcast()) {
238 struct tlb_args ta;
239 ta.ta_start = start;
240 ta.ta_end = end;
241 on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
242 } else
243 local_flush_tlb_kernel_range(start, end);
244 broadcast_tlb_a15_erratum();
245}
246
247void flush_bp_all(void)
248{
249 if (tlb_ops_need_broadcast())
250 on_each_cpu(ipi_flush_bp_all, NULL, 1);
251 else
252 __flush_bp_all();
253}