Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / devfreq / governor_performance.c

diff --git a/kernel/drivers/devfreq/governor_performance.c b/kernel/drivers/devfreq/governor_performance.c
new file mode 100644 (file)
index 0000000..c72f942
--- /dev/null
+++ b/kernel/drivers/devfreq/governor_performance.c
@@ -0,0 +1,67 @@
+/*
+ *  linux/drivers/devfreq/governor_performance.c
+ *
+ *  Copyright (C) 2011 Samsung Electronics
+ *     MyungJoo Ham <myungjoo.ham@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/devfreq.h>
+#include <linux/module.h>
+#include "governor.h"
+
+static int devfreq_performance_func(struct devfreq *df,
+                                   unsigned long *freq)
+{
+       /*
+        * target callback should be able to get floor value as
+        * said in devfreq.h
+        */
+       if (!df->max_freq)
+               *freq = UINT_MAX;
+       else
+               *freq = df->max_freq;
+       return 0;
+}
+
+static int devfreq_performance_handler(struct devfreq *devfreq,
+                               unsigned int event, void *data)
+{
+       int ret = 0;
+
+       if (event == DEVFREQ_GOV_START) {
+               mutex_lock(&devfreq->lock);
+               ret = update_devfreq(devfreq);
+               mutex_unlock(&devfreq->lock);
+       }
+
+       return ret;
+}
+
+static struct devfreq_governor devfreq_performance = {
+       .name = "performance",
+       .get_target_freq = devfreq_performance_func,
+       .event_handler = devfreq_performance_handler,
+};
+
+static int __init devfreq_performance_init(void)
+{
+       return devfreq_add_governor(&devfreq_performance);
+}
+subsys_initcall(devfreq_performance_init);
+
+static void __exit devfreq_performance_exit(void)
+{
+       int ret;
+
+       ret = devfreq_remove_governor(&devfreq_performance);
+       if (ret)
+               pr_err("%s: failed remove governor %d\n", __func__, ret);
+
+       return;
+}
+module_exit(devfreq_performance_exit);
+MODULE_LICENSE("GPL");