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 bool (*erratum_a15_798181_handler)(void); 75 76 static 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 83 static 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 90 void erratum_a15_798181_init(void) 91 { 92 unsigned int midr = read_cpuid_id(); 93 unsigned int revidr = read_cpuid(CPUID_REVIDR); 94 95 /* Cortex-A15 r0p0..r3p2 w/o ECO fix affected */ 96 if ((midr & 0xff0ffff0) != 0x410fc0f0 || midr > 0x413fc0f2 || 97 (revidr & 0x210) == 0x210) { 98 return; 99 } 100 if (revidr & 0x10) 101 erratum_a15_798181_handler = erratum_a15_798181_partial; 102 else 103 erratum_a15_798181_handler = erratum_a15_798181_broadcast; 104 } 105 #endif 106 107 static void ipi_flush_tlb_a15_erratum(void *arg) 108 { 109 dmb(); 110 } 111 112 static void broadcast_tlb_a15_erratum(void) 113 { 114 if (!erratum_a15_798181()) 115 return; 116 117 smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1); 118 } 119 120 static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm) 121 { 122 int this_cpu; 123 cpumask_t mask = { CPU_BITS_NONE }; 124 125 if (!erratum_a15_798181()) 126 return; 127 128 this_cpu = get_cpu(); 129 a15_erratum_get_cpumask(this_cpu, mm, &mask); 130 smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1); 131 put_cpu(); 132 } 133 134 void flush_tlb_all(void) 135 { 136 if (tlb_ops_need_broadcast()) 137 on_each_cpu(ipi_flush_tlb_all, NULL, 1); 138 else 139 __flush_tlb_all(); 140 broadcast_tlb_a15_erratum(); 141 } 142 143 void flush_tlb_mm(struct mm_struct *mm) 144 { 145 if (tlb_ops_need_broadcast()) 146 on_each_cpu_mask(mm_cpumask(mm), ipi_flush_tlb_mm, mm, 1); 147 else 148 __flush_tlb_mm(mm); 149 broadcast_tlb_mm_a15_erratum(mm); 150 } 151 152 void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) 153 { 154 if (tlb_ops_need_broadcast()) { 155 struct tlb_args ta; 156 ta.ta_vma = vma; 157 ta.ta_start = uaddr; 158 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page, 159 &ta, 1); 160 } else 161 __flush_tlb_page(vma, uaddr); 162 broadcast_tlb_mm_a15_erratum(vma->vm_mm); 163 } 164 165 void flush_tlb_kernel_page(unsigned long kaddr) 166 { 167 if (tlb_ops_need_broadcast()) { 168 struct tlb_args ta; 169 ta.ta_start = kaddr; 170 on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1); 171 } else 172 __flush_tlb_kernel_page(kaddr); 173 broadcast_tlb_a15_erratum(); 174 } 175 176 void flush_tlb_range(struct vm_area_struct *vma, 177 unsigned long start, unsigned long end) 178 { 179 if (tlb_ops_need_broadcast()) { 180 struct tlb_args ta; 181 ta.ta_vma = vma; 182 ta.ta_start = start; 183 ta.ta_end = end; 184 on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_range, 185 &ta, 1); 186 } else 187 local_flush_tlb_range(vma, start, end); 188 broadcast_tlb_mm_a15_erratum(vma->vm_mm); 189 } 190 191 void flush_tlb_kernel_range(unsigned long start, unsigned long end) 192 { 193 if (tlb_ops_need_broadcast()) { 194 struct tlb_args ta; 195 ta.ta_start = start; 196 ta.ta_end = end; 197 on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1); 198 } else 199 local_flush_tlb_kernel_range(start, end); 200 broadcast_tlb_a15_erratum(); 201 } 202 203 void flush_bp_all(void) 204 { 205 if (tlb_ops_need_broadcast()) 206 on_each_cpu(ipi_flush_bp_all, NULL, 1); 207 else 208 __flush_bp_all(); 209 } 210