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/*
* PPC 64 oprofile support:
* Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
* PPC 32 oprofile support: (based on PPC 64 support)
* Copyright (C) Freescale Semiconductor, Inc 2004
* Author: Andy Fleming
*
* Based on alpha version.
*
* 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>
#ifndef __powerpc64__
#include <linux/slab.h>
#endif /* ! __powerpc64__ */
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#ifdef __powerpc64__
#include <asm/pmc.h>
#else /* __powerpc64__ */
#include <asm/perfmon.h>
#endif /* __powerpc64__ */
#include <asm/cputable.h>
#include <asm/oprofile_impl.h>
static struct op_powerpc_model *model;
static struct op_counter_config ctr[OP_MAX_COUNTER];
static struct op_system_config sys;
#ifndef __powerpc64__
static char *cpu_type;
#endif /* ! __powerpc64__ */
static void op_handle_interrupt(struct pt_regs *regs)
{
model->handle_interrupt(regs, ctr);
}
static int op_powerpc_setup(void)
{
#ifdef __powerpc64__
int err;
/* Grab the hardware */
err = reserve_pmc_hardware(op_handle_interrupt);
if (err)
return err;
#else /* __powerpc64__ */
/* Install our interrupt handler into the existing hook. */
if (request_perfmon_irq(&op_handle_interrupt))
return -EBUSY;
mb();
#endif /* __powerpc64__ */
/* Pre-compute the values to stuff in the hardware registers. */
model->reg_setup(ctr, &sys, model->num_counters);
/* Configure the registers on all cpus. */
#ifdef __powerpc64__
on_each_cpu(model->cpu_setup, NULL, 0, 1);
#else /* __powerpc64__ */
#if 0
/* FIXME: Make multi-cpu work */
on_each_cpu(model->reg_setup, NULL, 0, 1);
#endif
#endif /* __powerpc64__ */
return 0;
}
static void op_powerpc_shutdown(void)
{
#ifdef __powerpc64__
release_pmc_hardware();
#else /* __powerpc64__ */
mb();
/* Remove our interrupt handler. We may be removing this module. */
free_perfmon_irq();
#endif /* __powerpc64__ */
}
static void op_powerpc_cpu_start(void *dummy)
{
model->start(ctr);
}
static int op_powerpc_start(void)
{
on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
return 0;
}
static inline void op_powerpc_cpu_stop(void *dummy)
{
model->stop();
}
static void op_powerpc_stop(void)
{
on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
}
static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
{
int i;
#ifdef __powerpc64__
/*
* There is one mmcr0, mmcr1 and mmcra for setting the events for
* all of the counters.
*/
oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
#endif /* __powerpc64__ */
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);
#ifdef __powerpc64__
/*
* We dont support per counter user/kernel selection, but
* we leave the entries because userspace expects them
*/
#endif /* __powerpc64__ */
oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
#ifndef __powerpc64__
/* FIXME: Not sure if this is used */
#endif /* ! __powerpc64__ */
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);
#ifdef __powerpc64__
oprofilefs_create_ulong(sb, root, "backtrace_spinlocks",
&sys.backtrace_spinlocks);
#endif /* __powerpc64__ */
/* Default to tracing both kernel and user */
sys.enable_kernel = 1;
sys.enable_user = 1;
#ifdef __powerpc64__
/* Turn on backtracing through spinlocks by default */
sys.backtrace_spinlocks = 1;
#endif /* __powerpc64__ */
return 0;
}
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
#ifndef __powerpc64__
int cpu_id = smp_processor_id();
#ifdef CONFIG_FSL_BOOKE
model = &op_model_fsl_booke;
#else
return -ENODEV;
#endif
cpu_type = kmalloc(32, GFP_KERNEL);
if (NULL == cpu_type)
return -ENOMEM;
sprintf(cpu_type, "ppc/%s", cur_cpu_spec[cpu_id]->cpu_name);
model->num_counters = cur_cpu_spec[cpu_id]->num_pmcs;
ops->cpu_type = cpu_type;
#else /* __powerpc64__ */
if (!cur_cpu_spec->oprofile_model || !cur_cpu_spec->oprofile_cpu_type)
return -ENODEV;
model = cur_cpu_spec->oprofile_model;
model->num_counters = cur_cpu_spec->num_pmcs;
ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
#endif /* __powerpc64__ */
ops->create_files = op_powerpc_create_files;
ops->setup = op_powerpc_setup;
ops->shutdown = op_powerpc_shutdown;
ops->start = op_powerpc_start;
ops->stop = op_powerpc_stop;
printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
ops->cpu_type);
return 0;
}
void oprofile_arch_exit(void)
{
#ifndef __powerpc64__
kfree(cpu_type);
cpu_type = NULL;
#endif /* ! __powerpc64__ */
}
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