/**
* @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 <asm/semaphore.h>
#include <linux/sysdev.h>
#include "op_counter.h"
#include "op_arm_model.h"
static struct op_arm_model_spec *pmu_model;
static int pmu_enabled;
static struct semaphore pmu_sem;
static int pmu_start(void);
static int pmu_setup(void);
static void pmu_stop(void);
static int pmu_create_files(struct super_block *, struct dentry *);
#ifdef CONFIG_PM
static int pmu_suspend(struct sys_device *dev, pm_message_t state)
{
if (pmu_enabled)
pmu_stop();
return 0;
}
static int pmu_resume(struct sys_device *dev)
{
if (pmu_enabled)
pmu_start();
return 0;
}
static struct sysdev_class oprofile_sysclass = {
set_kset_name("oprofile"),
.resume = pmu_resume,
.suspend = pmu_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 */
struct op_counter_config counter_config[OP_MAX_COUNTER];
static int pmu_create_files(struct super_block *sb, struct dentry *root)
{
unsigned int i;
for (i = 0; i < pmu_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 pmu_setup(void)
{
int ret;
spin_lock(&oprofilefs_lock);
ret = pmu_model->setup_ctrs();
spin_unlock(&oprofilefs_lock);
return ret;
}
static int pmu_start(void)
{
int ret = -EBUSY;
down(&pmu_sem);
if (!pmu_enabled) {
ret = pmu_model->start();
pmu_enabled = !ret;
}
up(&pmu_sem);
return ret;
}
static void pmu_stop(void)
{
down(&pmu_sem);
if (pmu_enabled)
pmu_model->stop();
pmu_enabled = 0;
up(&pmu_sem);
}
int __init pmu_init(struct oprofile_operations *ops, struct op_arm_model_spec *spec)
{
init_MUTEX(&pmu_sem);
if (spec->init() < 0)
return -ENODEV;
pmu_model = spec;
init_driverfs();
ops->create_files = pmu_create_files;
ops->setup = pmu_setup;
ops->shutdown = pmu_stop;
ops->start = pmu_start;
ops->stop = pmu_stop;
ops->cpu_type = pmu_model->name;
printk(KERN_INFO "oprofile: using %s PMU\n", spec->name);
return 0;
}
void pmu_exit(void)
{
if (pmu_model) {
exit_driverfs();
pmu_model = NULL;
}
}
