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 */ 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 68 static inline void ipi_flush_bp_all(void *ignored) 69 { 70 local_flush_bp_all(); 71 } 72 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(); 101 smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1); 102 } 103 104 static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm) 105 { 106 int this_cpu; 107 cpumask_t mask = { CPU_BITS_NONE }; 108 109 if (!erratum_a15_798181()) 110 return; 111 112 dummy_flush_tlb_a15_erratum(); 113 this_cpu = get_cpu(); 114 a15_erratum_get_cpumask(this_cpu, mm, &mask); 115 smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1); 116 put_cpu(); 117 } 118 119 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(); 125 broadcast_tlb_a15_erratum(); 126 } 127 128 void flush_tlb_mm(struct mm_struct *mm) 129 { 130 if (tlb_ops_need_broadcast()) 131 on_each_cpu_mask(mm_cpumask(mm), ipi_flush_tlb_mm, mm, 1); 132 else 133 local_flush_tlb_mm(mm); 134 broadcast_tlb_mm_a15_erratum(mm); 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; 143 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page, 144 &ta, 1); 145 } else 146 local_flush_tlb_page(vma, uaddr); 147 broadcast_tlb_mm_a15_erratum(vma->vm_mm); 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); 158 broadcast_tlb_a15_erratum(); 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; 169 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_range, 170 &ta, 1); 171 } else 172 local_flush_tlb_range(vma, start, end); 173 broadcast_tlb_mm_a15_erratum(vma->vm_mm); 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); 185 broadcast_tlb_a15_erratum(); 186 } 187 188 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 } 195