170 lines
3.5 KiB
C
170 lines
3.5 KiB
C
/**
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* @file common.c
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*
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* @remark Copyright 2004 Oprofile Authors
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* @remark Read the file COPYING
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*
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* @author Zwane Mwaikambo
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*/
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#include <linux/init.h>
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#include <linux/oprofile.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/sysdev.h>
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#include <linux/mutex.h>
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#include "op_counter.h"
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#include "op_arm_model.h"
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static struct op_arm_model_spec *op_arm_model;
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static int op_arm_enabled;
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static DEFINE_MUTEX(op_arm_mutex);
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struct op_counter_config *counter_config;
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static int op_arm_create_files(struct super_block *sb, struct dentry *root)
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{
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unsigned int i;
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for (i = 0; i < op_arm_model->num_counters; i++) {
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struct dentry *dir;
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char buf[4];
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snprintf(buf, sizeof buf, "%d", i);
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dir = oprofilefs_mkdir(sb, root, buf);
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oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
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oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
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oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
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oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
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oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
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oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
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}
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return 0;
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}
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static int op_arm_setup(void)
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{
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int ret;
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spin_lock(&oprofilefs_lock);
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ret = op_arm_model->setup_ctrs();
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spin_unlock(&oprofilefs_lock);
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return ret;
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}
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static int op_arm_start(void)
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{
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int ret = -EBUSY;
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mutex_lock(&op_arm_mutex);
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if (!op_arm_enabled) {
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ret = op_arm_model->start();
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op_arm_enabled = !ret;
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}
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mutex_unlock(&op_arm_mutex);
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return ret;
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}
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static void op_arm_stop(void)
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{
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mutex_lock(&op_arm_mutex);
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if (op_arm_enabled)
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op_arm_model->stop();
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op_arm_enabled = 0;
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mutex_unlock(&op_arm_mutex);
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}
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#ifdef CONFIG_PM
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static int op_arm_suspend(struct sys_device *dev, pm_message_t state)
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{
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mutex_lock(&op_arm_mutex);
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if (op_arm_enabled)
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op_arm_model->stop();
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mutex_unlock(&op_arm_mutex);
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return 0;
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}
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static int op_arm_resume(struct sys_device *dev)
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{
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mutex_lock(&op_arm_mutex);
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if (op_arm_enabled && op_arm_model->start())
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op_arm_enabled = 0;
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mutex_unlock(&op_arm_mutex);
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return 0;
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}
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static struct sysdev_class oprofile_sysclass = {
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set_kset_name("oprofile"),
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.resume = op_arm_resume,
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.suspend = op_arm_suspend,
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};
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static struct sys_device device_oprofile = {
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.id = 0,
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.cls = &oprofile_sysclass,
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};
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static int __init init_driverfs(void)
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{
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int ret;
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if (!(ret = sysdev_class_register(&oprofile_sysclass)))
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ret = sysdev_register(&device_oprofile);
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return ret;
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}
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static void exit_driverfs(void)
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{
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sysdev_unregister(&device_oprofile);
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sysdev_class_unregister(&oprofile_sysclass);
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}
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#else
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#define init_driverfs() do { } while (0)
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#define exit_driverfs() do { } while (0)
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#endif /* CONFIG_PM */
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int __init oprofile_arch_init(struct oprofile_operations *ops)
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{
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struct op_arm_model_spec *spec = NULL;
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int ret = -ENODEV;
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#ifdef CONFIG_CPU_XSCALE
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spec = &op_xscale_spec;
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#endif
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if (spec) {
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ret = spec->init();
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if (ret < 0)
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return ret;
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counter_config = kmalloc(sizeof(struct op_counter_config) * spec->num_counters,
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GFP_KERNEL);
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if (!counter_config)
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return -ENOMEM;
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op_arm_model = spec;
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init_driverfs();
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ops->create_files = op_arm_create_files;
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ops->setup = op_arm_setup;
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ops->shutdown = op_arm_stop;
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ops->start = op_arm_start;
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ops->stop = op_arm_stop;
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ops->cpu_type = op_arm_model->name;
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ops->backtrace = arm_backtrace;
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printk(KERN_INFO "oprofile: using %s\n", spec->name);
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}
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return ret;
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}
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void oprofile_arch_exit(void)
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{
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if (op_arm_model) {
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exit_driverfs();
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op_arm_model = NULL;
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}
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kfree(counter_config);
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}
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