55f052341f
The common oprofile code assumes the name "PMU" (from Intel's performance management unit). This is misleading when we start adding oprofile support for other machine types which don't use the same terminology. Call it op_arm_* instead of pmu_*. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
156 lines
3.2 KiB
C
156 lines
3.2 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 *op_arm_model;
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static int op_arm_enabled;
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static struct semaphore op_arm_sem;
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struct op_counter_config counter_config[OP_MAX_COUNTER];
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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[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 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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down(&op_arm_sem);
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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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up(&op_arm_sem);
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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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down(&op_arm_sem);
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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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up(&op_arm_sem);
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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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down(&op_arm_sem);
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if (op_arm_enabled)
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op_arm_model->stop();
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up(&op_arm_sem);
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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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down(&op_arm_sem);
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if (op_arm_enabled && op_arm_model->start())
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op_arm_enabled = 0;
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up(&op_arm_sem);
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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 op_arm_init(struct oprofile_operations *ops, struct op_arm_model_spec *spec)
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{
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init_MUTEX(&op_arm_sem);
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if (spec->init() < 0)
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return -ENODEV;
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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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printk(KERN_INFO "oprofile: using %s\n", spec->name);
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return 0;
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}
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void op_arm_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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}
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