[PATCH v3 6/9] vfio: Register pci, platform, amba, and mdev bus drivers

[Alex Williamson <alex.williamson@xxxxxxxxxx>]

Hook into vfio bus driver register/unregister support.

Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Cc: Baptiste Reynal <b.reynal@xxxxxxxxxxxxxxxxxxxxxx>
Cc: Kirti Wankhede <kwankhede@xxxxxxxxxx>
---
 drivers/vfio/mdev/vfio_mdev.c         |   13 ++++++++++++-
 drivers/vfio/pci/vfio_pci.c           |    7 +++++++
 drivers/vfio/platform/vfio_amba.c     |   24 +++++++++++++++++++++++-
 drivers/vfio/platform/vfio_platform.c |   24 +++++++++++++++++++++++-
 4 files changed, 65 insertions(+), 3 deletions(-)

diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
index fa848a701b8b..b73d6f3e8ad5 100644
--- a/drivers/vfio/mdev/vfio_mdev.c
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -131,11 +131,22 @@ struct mdev_driver vfio_mdev_driver = {
 
 static int __init vfio_mdev_init(void)
 {
-	return mdev_register_driver(&vfio_mdev_driver, THIS_MODULE);
+	int ret;
+
+	ret = mdev_register_driver(&vfio_mdev_driver, THIS_MODULE);
+	if (ret)
+		return ret;
+
+	ret = vfio_register_bus_driver(&vfio_mdev_driver.driver);
+	if (ret)
+		mdev_unregister_driver(&vfio_mdev_driver);
+
+	return ret;
 }
 
 static void __exit vfio_mdev_exit(void)
 {
+	vfio_unregister_bus_driver(&vfio_mdev_driver.driver);
 	mdev_unregister_driver(&vfio_mdev_driver);
 }
 
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 063c1ce6fa42..b9ac5b8c53e6 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1397,6 +1397,7 @@ static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
 
 static void __exit vfio_pci_cleanup(void)
 {
+	vfio_unregister_bus_driver(&vfio_pci_driver.driver);
 	pci_unregister_driver(&vfio_pci_driver);
 	vfio_pci_uninit_perm_bits();
 }
@@ -1456,6 +1457,12 @@ static int __init vfio_pci_init(void)
 	if (ret)
 		goto out_driver;
 
+	ret = vfio_register_bus_driver(&vfio_pci_driver.driver);
+	if (ret) {
+		pci_unregister_driver(&vfio_pci_driver);
+		goto out_driver;
+	}
+
 	vfio_pci_fill_ids();
 
 	return 0;
diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
index 31372fbf6c5b..7fd9cb4a6756 100644
--- a/drivers/vfio/platform/vfio_amba.c
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -109,7 +109,29 @@ static int vfio_amba_remove(struct amba_device *adev)
 	},
 };
 
-module_amba_driver(vfio_amba_driver);
+static void __exit vfio_amba_exit(void)
+{
+	vfio_unregister_bus_driver(&vfio_amba_driver.drv);
+	amba_driver_unregister(&vfio_amba_driver);
+}
+
+static int __init vfio_amba_init(void)
+{
+	int ret;
+
+	ret = amba_driver_register(&vfio_amba_driver);
+	if (ret)
+		return ret;
+
+	ret = vfio_register_bus_driver(&vfio_amba_driver.drv);
+	if (ret)
+		amba_driver_unregister(&vfio_amba_driver);
+
+	return ret;
+}
+
+module_init(vfio_amba_init);
+module_exit(vfio_amba_exit);
 
 MODULE_VERSION(DRIVER_VERSION);
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
index 6561751a1063..3974dc65e6dc 100644
--- a/drivers/vfio/platform/vfio_platform.c
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -100,7 +100,29 @@ static int vfio_platform_remove(struct platform_device *pdev)
 	},
 };
 
-module_platform_driver(vfio_platform_driver);
+static void __exit vfio_platform_exit(void)
+{
+	vfio_unregister_bus_driver(&vfio_platform_driver.driver);
+	platform_driver_unregister(&vfio_platform_driver);
+}
+
+static int __init vfio_platform_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&vfio_platform_driver);
+	if (ret)
+		return ret;
+
+	ret = vfio_register_bus_driver(&vfio_platform_driver.driver);
+	if (ret)
+		platform_driver_unregister(&vfio_platform_driver);
+
+	return ret;
+}
+
+module_init(vfio_platform_init);
+module_exit(vfio_platform_exit);
 
 MODULE_VERSION(DRIVER_VERSION);
 MODULE_LICENSE("GPL v2");