linux/arch/mips/oprofile/common.c
Daniel Kalmar 5f307491f3 MIPS: oprofile: Add callgraph support
Stack unwinding is done by code examination. For kernelspace, the
already existing unwind function is utilized that uses kallsyms to
quickly find the beginning of functions. For userspace a new function
was added that examines code at and before the pc.

Signed-off-by: Daniel Kalmar <kalmard@homejinni.com>
Signed-off-by: Gergely Kis <gergely@homejinni.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
2011-06-15 14:35:34 +02:00

131 lines
2.8 KiB
C

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2004, 2005 Ralf Baechle
* Copyright (C) 2005 MIPS Technologies, Inc.
*/
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/oprofile.h>
#include <linux/smp.h>
#include <asm/cpu-info.h>
#include "op_impl.h"
extern struct op_mips_model op_model_mipsxx_ops __weak;
extern struct op_mips_model op_model_rm9000_ops __weak;
extern struct op_mips_model op_model_loongson2_ops __weak;
static struct op_mips_model *model;
static struct op_counter_config ctr[20];
static int op_mips_setup(void)
{
/* Pre-compute the values to stuff in the hardware registers. */
model->reg_setup(ctr);
/* Configure the registers on all cpus. */
on_each_cpu(model->cpu_setup, NULL, 1);
return 0;
}
static int op_mips_create_files(struct super_block *sb, struct dentry *root)
{
int i;
for (i = 0; i < model->num_counters; ++i) {
struct dentry *dir;
char buf[4];
snprintf(buf, sizeof buf, "%d", i);
dir = oprofilefs_mkdir(sb, root, buf);
oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
oprofilefs_create_ulong(sb, dir, "exl", &ctr[i].exl);
/* Dummy. */
oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
}
return 0;
}
static int op_mips_start(void)
{
on_each_cpu(model->cpu_start, NULL, 1);
return 0;
}
static void op_mips_stop(void)
{
/* Disable performance monitoring for all counters. */
on_each_cpu(model->cpu_stop, NULL, 1);
}
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
struct op_mips_model *lmodel = NULL;
int res;
switch (current_cpu_type()) {
case CPU_5KC:
case CPU_20KC:
case CPU_24K:
case CPU_25KF:
case CPU_34K:
case CPU_1004K:
case CPU_74K:
case CPU_SB1:
case CPU_SB1A:
case CPU_R10000:
case CPU_R12000:
case CPU_R14000:
lmodel = &op_model_mipsxx_ops;
break;
case CPU_RM9000:
lmodel = &op_model_rm9000_ops;
break;
case CPU_LOONGSON2:
lmodel = &op_model_loongson2_ops;
break;
};
if (!lmodel)
return -ENODEV;
res = lmodel->init();
if (res)
return res;
model = lmodel;
ops->create_files = op_mips_create_files;
ops->setup = op_mips_setup;
//ops->shutdown = op_mips_shutdown;
ops->start = op_mips_start;
ops->stop = op_mips_stop;
ops->cpu_type = lmodel->cpu_type;
ops->backtrace = op_mips_backtrace;
printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
lmodel->cpu_type);
return 0;
}
void oprofile_arch_exit(void)
{
if (model)
model->exit();
}