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152 lines
2.9 KiB
C
152 lines
2.9 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/sysdev.h>
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#include <asm/semaphore.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 *pmu_model;
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static int pmu_enabled;
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static struct semaphore pmu_sem;
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struct op_counter_config counter_config[OP_MAX_COUNTER];
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static int pmu_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 < pmu_model->num_counters; i++) {
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struct dentry *dir;
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char buf[2];
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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 pmu_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 = pmu_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 pmu_start(void)
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{
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int ret = -EBUSY;
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down(&pmu_sem);
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if (!pmu_enabled) {
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ret = pmu_model->start();
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pmu_enabled = !ret;
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}
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up(&pmu_sem);
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return ret;
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}
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static void pmu_stop(void)
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{
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down(&pmu_sem);
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if (pmu_enabled)
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pmu_model->stop();
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pmu_enabled = 0;
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up(&pmu_sem);
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}
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#ifdef CONFIG_PM
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static int pmu_suspend(struct sys_device *dev, pm_message_t state)
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{
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if (pmu_enabled)
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pmu_stop();
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return 0;
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}
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static int pmu_resume(struct sys_device *dev)
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{
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if (pmu_enabled)
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pmu_start();
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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 = pmu_resume,
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.suspend = pmu_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 pmu_init(struct oprofile_operations *ops, struct op_arm_model_spec *spec)
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{
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init_MUTEX(&pmu_sem);
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if (spec->init() < 0)
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return -ENODEV;
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pmu_model = spec;
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init_driverfs();
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ops->create_files = pmu_create_files;
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ops->setup = pmu_setup;
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ops->shutdown = pmu_stop;
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ops->start = pmu_start;
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ops->stop = pmu_stop;
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ops->cpu_type = pmu_model->name;
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printk(KERN_INFO "oprofile: using %s PMU\n", spec->name);
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return 0;
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}
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void pmu_exit(void)
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{
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if (pmu_model) {
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exit_driverfs();
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pmu_model = NULL;
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}
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}
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