Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
new file mode 100644
index 0000000000..7825d83a55
--- /dev/null
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * MDEV driver
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ *     Author: Neo Jia <cjia@nvidia.com>
+ *             Kirti Wankhede <kwankhede@nvidia.com>
+ */
+
+#include <linux/iommu.h>
+#include <linux/mdev.h>
+
+#include "mdev_private.h"
+
+static int mdev_probe(struct device *dev)
+{
+	struct mdev_driver *drv =
+		container_of(dev->driver, struct mdev_driver, driver);
+
+	if (!drv->probe)
+		return 0;
+	return drv->probe(to_mdev_device(dev));
+}
+
+static void mdev_remove(struct device *dev)
+{
+	struct mdev_driver *drv =
+		container_of(dev->driver, struct mdev_driver, driver);
+
+	if (drv->remove)
+		drv->remove(to_mdev_device(dev));
+}
+
+static int mdev_match(struct device *dev, struct device_driver *drv)
+{
+	/*
+	 * No drivers automatically match. Drivers are only bound by explicit
+	 * device_driver_attach()
+	 */
+	return 0;
+}
+
+struct bus_type mdev_bus_type = {
+	.name		= "mdev",
+	.probe		= mdev_probe,
+	.remove		= mdev_remove,
+	.match		= mdev_match,
+};
+
+/**
+ * mdev_register_driver - register a new MDEV driver
+ * @drv: the driver to register
+ *
+ * Returns a negative value on error, otherwise 0.
+ **/
+int mdev_register_driver(struct mdev_driver *drv)
+{
+	if (!drv->device_api)
+		return -EINVAL;
+
+	/* initialize common driver fields */
+	drv->driver.bus = &mdev_bus_type;
+	return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL(mdev_register_driver);
+
+/*
+ * mdev_unregister_driver - unregister MDEV driver
+ * @drv: the driver to unregister
+ */
+void mdev_unregister_driver(struct mdev_driver *drv)
+{
+	driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL(mdev_unregister_driver);