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 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 }