1 files changed, 156 insertions, 0 deletions
diff --git a/arch/arm/oprofile/common.c b/arch/arm/oprofile/common.c
new file mode 100644
index 00000000000..e57dde88289
--- /dev/null
+++ b/arch/arm/oprofile/common.c
@@ -0,0 +1,156 @@
+/**
+ * @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;
+	}
+}
+