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/*
* PPC 32 oprofile support
* Based on PPC64 oprofile support
* Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
*
* Copyright (C) Freescale Semiconductor, Inc 2004
*
* Author: Andy Fleming
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/oprofile.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/perfmon.h>
#include <asm/cputable.h>
#include "op_impl.h"
static struct op_powerpc_model *model;
static struct op_counter_config ctr[OP_MAX_COUNTER];
static struct op_system_config sys;
static void op_handle_interrupt(struct pt_regs *regs)
{
model->handle_interrupt(regs, ctr);
}
static int op_ppc32_setup(void)
{
/* Install our interrupt handler into the existing hook. */
if(request_perfmon_irq(&op_handle_interrupt))
return -EBUSY;
mb();
/* Pre-compute the values to stuff in the hardware registers. */
model->reg_setup(ctr, &sys, model->num_counters);
#if 0
/* FIXME: Make multi-cpu work */
/* Configure the registers on all cpus. */
on_each_cpu(model->reg_setup, NULL, 0, 1);
#endif
return 0;
}
static void op_ppc32_shutdown(void)
{
mb();
/* Remove our interrupt handler. We may be removing this module. */
free_perfmon_irq();
}
static void op_ppc32_cpu_start(void *dummy)
{
model->start(ctr);
}
static int op_ppc32_start(void)
{
on_each_cpu(op_ppc32_cpu_start, NULL, 0, 1);
return 0;
}
static inline void op_ppc32_cpu_stop(void *dummy)
{
model->stop();
}
static void op_ppc32_stop(void)
{
on_each_cpu(op_ppc32_cpu_stop, NULL, 0, 1);
}
static int op_ppc32_create_files(struct super_block *sb, struct dentry *root)
{
int i;
for (i = 0; i < model->num_counters; ++i) {
struct dentry *dir;
char buf[3];
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);
/* FIXME: Not sure if this is used */
oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
}
oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
/* Default to tracing both kernel and user */
sys.enable_kernel = 1;
sys.enable_user = 1;
return 0;
}
static struct oprofile_operations oprof_ppc32_ops = {
.create_files = op_ppc32_create_files,
.setup = op_ppc32_setup,
.shutdown = op_ppc32_shutdown,
.start = op_ppc32_start,
.stop = op_ppc32_stop,
.cpu_type = NULL /* To be filled in below. */
};
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
char *name;
int cpu_id = smp_processor_id();
#ifdef CONFIG_FSL_BOOKE
model = &op_model_fsl_booke;
#else
return -ENODEV;
#endif
name = kmalloc(32, GFP_KERNEL);
if (NULL == name)
return -ENOMEM;
sprintf(name, "ppc/%s", cur_cpu_spec[cpu_id]->cpu_name);
oprof_ppc32_ops.cpu_type = name;
model->num_counters = cur_cpu_spec[cpu_id]->num_pmcs;
*ops = oprof_ppc32_ops;
printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
oprof_ppc32_ops.cpu_type);
return 0;
}
void oprofile_arch_exit(void)
{
kfree(oprof_ppc32_ops.cpu_type);
oprof_ppc32_ops.cpu_type = NULL;
}
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