kernel/arch/arm/kernel/smp_tlb.c

   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         /* 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
 111 static void ipi_flush_tlb_a15_erratum(void *arg)
 112 {
 113         dmb();
 114 }
 115
 116 static 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
 124 static 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
 138 void 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
 147 void 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
 156 void 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
 169 void 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
 180 void 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
 195 void 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
 207 void 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 }