LXR linux/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
  23static struct op_sh_model *model;
  24
  25static struct op_counter_config ctr[20];
  26
  27extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth);
  28
  29static int op_sh_setup(void)
  30{
  31        /* Pre-compute the values to stuff in the hardware registers.  */
  32        model->reg_setup(ctr);
  33
  34        /* Configure the registers on all cpus.  */
  35        on_each_cpu(model->cpu_setup, NULL, 1);
  36
  37        return 0;
  38}
  39
  40static int op_sh_create_files(struct super_block *sb, struct dentry *root)
  41{
  42        int i, ret = 0;
  43
  44        for (i = 0; i < model->num_counters; i++) {
  45                struct dentry *dir;
  46                char buf[4];
  47
  48                snprintf(buf, sizeof(buf), "%d", i);
  49                dir = oprofilefs_mkdir(sb, root, buf);
  50
  51                ret |= oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
  52                ret |= oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
  53                ret |= oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
  54                ret |= oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
  55
  56                if (model->create_files)
  57                        ret |= model->create_files(sb, dir);
  58                else
  59                        ret |= oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
  60
  61                /* Dummy entries */
  62                ret |= oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
  63        }
  64
  65        return ret;
  66}
  67
  68static int op_sh_start(void)
  69{
  70        /* Enable performance monitoring for all counters.  */
  71        on_each_cpu(model->cpu_start, NULL, 1);
  72
  73        return 0;
  74}
  75
  76static void op_sh_stop(void)
  77{
  78        /* Disable performance monitoring for all counters.  */
  79        on_each_cpu(model->cpu_stop, NULL, 1);
  80}
  81
  82int __init oprofile_arch_init(struct oprofile_operations *ops)
  83{
  84        struct op_sh_model *lmodel = NULL;
  85        int ret;
  86
  87        /*
  88         * Always assign the backtrace op. If the counter initialization
  89         * fails, we fall back to the timer which will still make use of
  90         * this.
  91         */
  92        ops->backtrace = sh_backtrace;
  93
  94        /*
  95         * XXX
  96         *
  97         * All of the SH7750/SH-4A counters have been converted to perf,
  98         * this infrastructure hook is left for other users until they've
  99         * had a chance to convert over, at which point all of this
 100         * will be deleted.
 101         */
 102
 103        if (!lmodel)
 104                return -ENODEV;
 105        if (!(current_cpu_data.flags & CPU_HAS_PERF_COUNTER))
 106                return -ENODEV;
 107
 108        ret = lmodel->init();
 109        if (unlikely(ret != 0))
 110                return ret;
 111
 112        model = lmodel;
 113
 114        ops->setup              = op_sh_setup;
 115        ops->create_files       = op_sh_create_files;
 116        ops->start              = op_sh_start;
 117        ops->stop               = op_sh_stop;
 118        ops->cpu_type           = lmodel->cpu_type;
 119
 120        printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
 121               lmodel->cpu_type);
 122
 123        return 0;
 124}
 125
 126void oprofile_arch_exit(void)
 127{
 128        if (model && model->exit)
 129                model->exit();
 130}
 131