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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
16static void on_each_cpu_mask(void (*func)(void *), void *info, int wait,
17 const struct cpumask *mask)
18{
19 preempt_disable();
20
21 smp_call_function_many(mask, func, info, wait);
22 if (cpumask_test_cpu(smp_processor_id(), mask))
23 func(info);
24
25 preempt_enable();
26}
27
28/**********************************************************************/
29
30/*
31 * TLB operations
32 */
33struct tlb_args {
34 struct vm_area_struct *ta_vma;
35 unsigned long ta_start;
36 unsigned long ta_end;
37};
38
39static inline void ipi_flush_tlb_all(void *ignored)
40{
41 local_flush_tlb_all();
42}
43
44static inline void ipi_flush_tlb_mm(void *arg)
45{
46 struct mm_struct *mm = (struct mm_struct *)arg;
47
48 local_flush_tlb_mm(mm);
49}
50
51static inline void ipi_flush_tlb_page(void *arg)
52{
53 struct tlb_args *ta = (struct tlb_args *)arg;
54
55 local_flush_tlb_page(ta->ta_vma, ta->ta_start);
56}
57
58static inline void ipi_flush_tlb_kernel_page(void *arg)
59{
60 struct tlb_args *ta = (struct tlb_args *)arg;
61
62 local_flush_tlb_kernel_page(ta->ta_start);
63}
64
65static inline void ipi_flush_tlb_range(void *arg)
66{
67 struct tlb_args *ta = (struct tlb_args *)arg;
68
69 local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
70}
71
72static inline void ipi_flush_tlb_kernel_range(void *arg)
73{
74 struct tlb_args *ta = (struct tlb_args *)arg;
75
76 local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
77}
78
79void flush_tlb_all(void)
80{
81 if (tlb_ops_need_broadcast())
82 on_each_cpu(ipi_flush_tlb_all, NULL, 1);
83 else
84 local_flush_tlb_all();
85}
86
87void flush_tlb_mm(struct mm_struct *mm)
88{
89 if (tlb_ops_need_broadcast())
90 on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, mm_cpumask(mm));
91 else
92 local_flush_tlb_mm(mm);
93}
94
95void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
96{
97 if (tlb_ops_need_broadcast()) {
98 struct tlb_args ta;
99 ta.ta_vma = vma;
100 ta.ta_start = uaddr;
101 on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, mm_cpumask(vma->vm_mm));
102 } else
103 local_flush_tlb_page(vma, uaddr);
104}
105
106void flush_tlb_kernel_page(unsigned long kaddr)
107{
108 if (tlb_ops_need_broadcast()) {
109 struct tlb_args ta;
110 ta.ta_start = kaddr;
111 on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
112 } else
113 local_flush_tlb_kernel_page(kaddr);
114}
115
116void flush_tlb_range(struct vm_area_struct *vma,
117 unsigned long start, unsigned long end)
118{
119 if (tlb_ops_need_broadcast()) {
120 struct tlb_args ta;
121 ta.ta_vma = vma;
122 ta.ta_start = start;
123 ta.ta_end = end;
124 on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, mm_cpumask(vma->vm_mm));
125 } else
126 local_flush_tlb_range(vma, start, end);
127}
128
129void flush_tlb_kernel_range(unsigned long start, unsigned long end)
130{
131 if (tlb_ops_need_broadcast()) {
132 struct tlb_args ta;
133 ta.ta_start = start;
134 ta.ta_end = end;
135 on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
136 } else
137 local_flush_tlb_kernel_range(start, end);
138}
139
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}