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/**
* @file common.c
*
* @remark Copyright 2004 Oprofile Authors
* @remark Read the file COPYING
*
* @author Zwane Mwaikambo
*/
#include <linux/init.h>
#include <linux/oprofile.h>
#include <linux/errno.h>
#include <linux/sysdev.h>
#include <asm/semaphore.h>
#include "op_counter.h"
#include "op_arm_model.h"
static struct op_arm_model_spec *op_arm_model;
static int op_arm_enabled;
static struct semaphore op_arm_sem;
struct op_counter_config counter_config[OP_MAX_COUNTER];
static int op_arm_create_files(struct super_block *sb, struct dentry *root)
{
unsigned int i;
for (i = 0; i < op_arm_model->num_counters; i++) {
struct dentry *dir;
char buf[2];
snprintf(buf, sizeof buf, "%d", i);
dir = oprofilefs_mkdir(sb, root, buf);
oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
}
return 0;
}
static int op_arm_setup(void)
{
int ret;
spin_lock(&oprofilefs_lock);
ret = op_arm_model->setup_ctrs();
spin_unlock(&oprofilefs_lock);
return ret;
}
static int op_arm_start(void)
{
int ret = -EBUSY;
down(&op_arm_sem);
if (!op_arm_enabled) {
ret = op_arm_model->start();
op_arm_enabled = !ret;
}
up(&op_arm_sem);
return ret;
}
static void op_arm_stop(void)
{
down(&op_arm_sem);
if (op_arm_enabled)
op_arm_model->stop();
op_arm_enabled = 0;
up(&op_arm_sem);
}
#ifdef CONFIG_PM
static int op_arm_suspend(struct sys_device *dev, pm_message_t state)
{
down(&op_arm_sem);
if (op_arm_enabled)
op_arm_model->stop();
up(&op_arm_sem);
return 0;
}
static int op_arm_resume(struct sys_device *dev)
{
down(&op_arm_sem);
if (op_arm_enabled && op_arm_model->start())
op_arm_enabled = 0;
up(&op_arm_sem);
return 0;
}
static struct sysdev_class oprofile_sysclass = {
set_kset_name("oprofile"),
.resume = op_arm_resume,
.suspend = op_arm_suspend,
};
static struct sys_device device_oprofile = {
.id = 0,
.cls = &oprofile_sysclass,
};
static int __init init_driverfs(void)
{
int ret;
if (!(ret = sysdev_class_register(&oprofile_sysclass)))
ret = sysdev_register(&device_oprofile);
return ret;
}
static void exit_driverfs(void)
{
sysdev_unregister(&device_oprofile);
sysdev_class_unregister(&oprofile_sysclass);
}
#else
#define init_driverfs() do { } while (0)
#define exit_driverfs() do { } while (0)
#endif /* CONFIG_PM */
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
struct op_arm_model_spec *spec = NULL;
int ret = -ENODEV;
#ifdef CONFIG_CPU_XSCALE
spec = &op_xscale_spec;
#endif
if (spec) {
init_MUTEX(&op_arm_sem);
ret = spec->init();
if (ret < 0)
return ret;
op_arm_model = spec;
init_driverfs();
ops->create_files = op_arm_create_files;
ops->setup = op_arm_setup;
ops->shutdown = op_arm_stop;
ops->start = op_arm_start;
ops->stop = op_arm_stop;
ops->cpu_type = op_arm_model->name;
ops->backtrace = arm_backtrace;
printk(KERN_INFO "oprofile: using %s\n", spec->name);
}
return ret;
}
void oprofile_arch_exit(void)
{
if (op_arm_model) {
exit_driverfs();
op_arm_model = NULL;
}
}
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