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
  16 static void on_each_cpu_mask(void (*func)(void *), void *info, int wait,
  17         const struct cpumask *mask)
  18 {
  19         preempt_disable();
  20
  21         smp_call_function_many(mask, func, info, wait);
  22         if (cpumask_test_cpu(smp_processor_id(), mask))
  23                 func(info);
  24
  25         preempt_enable();
  26 }
  27
  28 /**********************************************************************/
  29
  30 /*
  31  * TLB operations
  32  */
  33 struct tlb_args {
  34         struct vm_area_struct *ta_vma;
  35         unsigned long ta_start;
  36         unsigned long ta_end;
  37 };
  38
  39 static inline void ipi_flush_tlb_all(void *ignored)
  40 {
  41         local_flush_tlb_all();
  42 }
  43
  44 static inline void ipi_flush_tlb_mm(void *arg)
  45 {
  46         struct mm_struct *mm = (struct mm_struct *)arg;
  47
  48         local_flush_tlb_mm(mm);
  49 }
  50
  51 static inline void ipi_flush_tlb_page(void *arg)
  52 {
  53         struct tlb_args *ta = (struct tlb_args *)arg;
  54
  55         local_flush_tlb_page(ta->ta_vma, ta->ta_start);
  56 }
  57
  58 static inline void ipi_flush_tlb_kernel_page(void *arg)
  59 {
  60         struct tlb_args *ta = (struct tlb_args *)arg;
  61
  62         local_flush_tlb_kernel_page(ta->ta_start);
  63 }
  64
  65 static inline void ipi_flush_tlb_range(void *arg)
  66 {
  67         struct tlb_args *ta = (struct tlb_args *)arg;
  68
  69         local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
  70 }
  71
  72 static inline void ipi_flush_tlb_kernel_range(void *arg)
  73 {
  74         struct tlb_args *ta = (struct tlb_args *)arg;
  75
  76         local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
  77 }
  78
  79 void flush_tlb_all(void)
  80 {
  81         if (tlb_ops_need_broadcast())
  82                 on_each_cpu(ipi_flush_tlb_all, NULL, 1);
  83         else
  84                 local_flush_tlb_all();
  85 }
  86
  87 void flush_tlb_mm(struct mm_struct *mm)
  88 {
  89         if (tlb_ops_need_broadcast())
  90                 on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, mm_cpumask(mm));
  91         else
  92                 local_flush_tlb_mm(mm);
  93 }
  94
  95 void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
  96 {
  97         if (tlb_ops_need_broadcast()) {
  98                 struct tlb_args ta;
  99                 ta.ta_vma = vma;
 100                 ta.ta_start = uaddr;
 101                 on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, mm_cpumask(vma->vm_mm));
 102         } else
 103                 local_flush_tlb_page(vma, uaddr);
 104 }
 105
 106 void flush_tlb_kernel_page(unsigned long kaddr)
 107 {
 108         if (tlb_ops_need_broadcast()) {
 109                 struct tlb_args ta;
 110                 ta.ta_start = kaddr;
 111                 on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
 112         } else
 113                 local_flush_tlb_kernel_page(kaddr);
 114 }
 115
 116 void flush_tlb_range(struct vm_area_struct *vma,
 117                      unsigned long start, unsigned long end)
 118 {
 119         if (tlb_ops_need_broadcast()) {
 120                 struct tlb_args ta;
 121                 ta.ta_vma = vma;
 122                 ta.ta_start = start;
 123                 ta.ta_end = end;
 124                 on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, mm_cpumask(vma->vm_mm));
 125         } else
 126                 local_flush_tlb_range(vma, start, end);
 127 }
 128
 129 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 130 {
 131         if (tlb_ops_need_broadcast()) {
 132                 struct tlb_args ta;
 133                 ta.ta_start = start;
 134                 ta.ta_end = end;
 135                 on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
 136         } else
 137                 local_flush_tlb_kernel_range(start, end);
 138 }
 139