2 * linux/arch/arm/kernel/smp_tlb.c
4 * Copyright (C) 2002 ARM Limited, All Rights Reserved.
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.
10 #include <linux/preempt.h>
11 #include <linux/smp.h>
13 #include <asm/smp_plat.h>
14 #include <asm/tlbflush.h>
15 #include <asm/mmu_context.h>
17 /**********************************************************************/
23 struct vm_area_struct *ta_vma;
24 unsigned long ta_start;
28 static inline void ipi_flush_tlb_all(void *ignored)
30 local_flush_tlb_all();
33 static inline void ipi_flush_tlb_mm(void *arg)
35 struct mm_struct *mm = (struct mm_struct *)arg;
37 local_flush_tlb_mm(mm);
40 static inline void ipi_flush_tlb_page(void *arg)
42 struct tlb_args *ta = (struct tlb_args *)arg;
44 local_flush_tlb_page(ta->ta_vma, ta->ta_start);
47 static inline void ipi_flush_tlb_kernel_page(void *arg)
49 struct tlb_args *ta = (struct tlb_args *)arg;
51 local_flush_tlb_kernel_page(ta->ta_start);
54 static inline void ipi_flush_tlb_range(void *arg)
56 struct tlb_args *ta = (struct tlb_args *)arg;
58 local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
61 static inline void ipi_flush_tlb_kernel_range(void *arg)
63 struct tlb_args *ta = (struct tlb_args *)arg;
65 local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
68 static inline void ipi_flush_bp_all(void *ignored)
73 #ifdef CONFIG_ARM_ERRATA_798181
74 bool (*erratum_a15_798181_handler)(void);
76 static bool erratum_a15_798181_partial(void)
78 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0));
83 static bool erratum_a15_798181_broadcast(void)
85 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0));
90 void erratum_a15_798181_init(void)
92 unsigned int midr = read_cpuid_id();
93 unsigned int revidr = read_cpuid(CPUID_REVIDR);
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) {
102 erratum_a15_798181_handler =
103 erratum_a15_798181_partial;
105 erratum_a15_798181_handler =
106 erratum_a15_798181_broadcast;
111 static void ipi_flush_tlb_a15_erratum(void *arg)
116 static void broadcast_tlb_a15_erratum(void)
118 if (!erratum_a15_798181())
121 smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1);
124 static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm)
127 cpumask_t mask = { CPU_BITS_NONE };
129 if (!erratum_a15_798181())
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);
138 void flush_tlb_all(void)
140 if (tlb_ops_need_broadcast())
141 on_each_cpu(ipi_flush_tlb_all, NULL, 1);
144 broadcast_tlb_a15_erratum();
147 void flush_tlb_mm(struct mm_struct *mm)
149 if (tlb_ops_need_broadcast())
150 on_each_cpu_mask(mm_cpumask(mm), ipi_flush_tlb_mm, mm, 1);
153 broadcast_tlb_mm_a15_erratum(mm);
156 void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
158 if (tlb_ops_need_broadcast()) {
162 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page,
165 __flush_tlb_page(vma, uaddr);
166 broadcast_tlb_mm_a15_erratum(vma->vm_mm);
169 void flush_tlb_kernel_page(unsigned long kaddr)
171 if (tlb_ops_need_broadcast()) {
174 on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
176 __flush_tlb_kernel_page(kaddr);
177 broadcast_tlb_a15_erratum();
180 void flush_tlb_range(struct vm_area_struct *vma,
181 unsigned long start, unsigned long end)
183 if (tlb_ops_need_broadcast()) {
188 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_range,
191 local_flush_tlb_range(vma, start, end);
192 broadcast_tlb_mm_a15_erratum(vma->vm_mm);
195 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
197 if (tlb_ops_need_broadcast()) {
201 on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
203 local_flush_tlb_kernel_range(start, end);
204 broadcast_tlb_a15_erratum();
207 void flush_bp_all(void)
209 if (tlb_ops_need_broadcast())
210 on_each_cpu(ipi_flush_bp_all, NULL, 1);