arch/sh/oprofile/common.c

   1 /*
   2  * arch/sh/oprofile/init.c
   3  *
   4  * Copyright (C) 2003 - 2008  Paul Mundt
   5  *
   6  * Based on arch/mips/oprofile/common.c:
   7  *
   8  *      Copyright (C) 2004, 2005 Ralf Baechle
   9  *      Copyright (C) 2005 MIPS Technologies, Inc.
  10  *
  11  * This file is subject to the terms and conditions of the GNU General Public
  12  * License.  See the file "COPYING" in the main directory of this archive
  13  * for more details.
  14  */
  15 #include <linux/kernel.h>
  16 #include <linux/oprofile.h>
  17 #include <linux/init.h>
  18 #include <linux/errno.h>
  19 #include <linux/smp.h>
  20 #include <asm/processor.h>
  21 #include "op_impl.h"
  22
  23 extern struct op_sh_model op_model_sh7750_ops __weak;
  24 extern struct op_sh_model op_model_sh4a_ops __weak;
  25
  26 static struct op_sh_model *model;
  27
  28 static struct op_counter_config ctr[20];
  29
  30 extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth);
  31
  32 static int op_sh_setup(void)
  33 {
  34         /* Pre-compute the values to stuff in the hardware registers.  */
  35         model->reg_setup(ctr);
  36
  37         /* Configure the registers on all cpus.  */
  38         on_each_cpu(model->cpu_setup, NULL, 1);
  39
  40         return 0;
  41 }
  42
  43 static int op_sh_create_files(struct super_block *sb, struct dentry *root)
  44 {
  45         int i, ret = 0;
  46
  47         for (i = 0; i < model->num_counters; i++) {
  48                 struct dentry *dir;
  49                 char buf[4];
  50
  51                 snprintf(buf, sizeof(buf), "%d", i);
  52                 dir = oprofilefs_mkdir(sb, root, buf);
  53
  54                 ret |= oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
  55                 ret |= oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
  56                 ret |= oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
  57                 ret |= oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
  58
  59                 if (model->create_files)
  60                         ret |= model->create_files(sb, dir);
  61                 else
  62                         ret |= oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
  63
  64                 /* Dummy entries */
  65                 ret |= oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
  66         }
  67
  68         return ret;
  69 }
  70
  71 static int op_sh_start(void)
  72 {
  73         /* Enable performance monitoring for all counters.  */
  74         on_each_cpu(model->cpu_start, NULL, 1);
  75
  76         return 0;
  77 }
  78
  79 static void op_sh_stop(void)
  80 {
  81         /* Disable performance monitoring for all counters.  */
  82         on_each_cpu(model->cpu_stop, NULL, 1);
  83 }
  84
  85 int __init oprofile_arch_init(struct oprofile_operations *ops)
  86 {
  87         struct op_sh_model *lmodel = NULL;
  88         int ret;
  89
  90         /*
  91          * Always assign the backtrace op. If the counter initialization
  92          * fails, we fall back to the timer which will still make use of
  93          * this.
  94          */
  95         ops->backtrace = sh_backtrace;
  96
  97         switch (current_cpu_data.type) {
  98         /* SH-4 types */
  99         case CPU_SH7750:
 100         case CPU_SH7750S:
 101                 lmodel = &op_model_sh7750_ops;
 102                 break;
 103
 104         /* SH-4A types */
 105         case CPU_SH7763:
 106         case CPU_SH7770:
 107         case CPU_SH7780:
 108         case CPU_SH7781:
 109         case CPU_SH7785:
 110         case CPU_SH7786:
 111         case CPU_SH7723:
 112         case CPU_SHX3:
 113                 lmodel = &op_model_sh4a_ops;
 114                 break;
 115
 116         /* SH4AL-DSP types */
 117         case CPU_SH7343:
 118         case CPU_SH7722:
 119         case CPU_SH7366:
 120                 lmodel = &op_model_sh4a_ops;
 121                 break;
 122         }
 123
 124         if (!lmodel)
 125                 return -ENODEV;
 126         if (!(current_cpu_data.flags & CPU_HAS_PERF_COUNTER))
 127                 return -ENODEV;
 128
 129         ret = lmodel->init();
 130         if (unlikely(ret != 0))
 131                 return ret;
 132
 133         model = lmodel;
 134
 135         ops->setup              = op_sh_setup;
 136         ops->create_files       = op_sh_create_files;
 137         ops->start              = op_sh_start;
 138         ops->stop               = op_sh_stop;
 139         ops->cpu_type           = lmodel->cpu_type;
 140
 141         printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
 142                lmodel->cpu_type);
 143
 144         return 0;
 145 }
 146
 147 void oprofile_arch_exit(void)
 148 {
 149         if (model && model->exit)
 150                 model->exit();
 151 }