cpuquiet: userspace governor

Change-Id: If9830d423b1751cbe9493eda0a85f88e7003173f
Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-on: http://git-master/r/105270
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Tested-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/cpuquiet/governors/userspace.c b/drivers/cpuquiet/governors/userspace.c
new file mode 100644
index 000000000000..470056c5e32a
--- /dev/null
+++ b/drivers/cpuquiet/governors/userspace.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2012 NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
+
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/cpuquiet.h>
+#include <linux/sysfs.h>
+
+static DEFINE_MUTEX(userspace_mutex);
+
+static int governor_set(unsigned int cpu, bool active)
+{
+	mutex_lock(&userspace_mutex);
+	if (active)
+		cpuquiet_wake_cpu(cpu);
+	else
+		cpuquiet_quiesence_cpu(cpu);
+	mutex_unlock(&userspace_mutex);
+
+	return 0;
+}
+
+struct cpuquiet_governor userspace_governor = {
+	.name		= "userspace",
+	.store_active	= governor_set,
+	.owner		= THIS_MODULE,
+};
+
+static int __init init_usermode(void)
+{
+	return cpuquiet_register_governor(&userspace_governor);
+}
+
+static void __exit exit_usermode(void)
+{
+	cpuquiet_unregister_governor(&userspace_governor);
+}
+
+MODULE_LICENSE("GPL");
+module_init(init_usermode);
+module_exit(exit_usermode);