vfio/mdev: Remove kobj from mdev_parent_ops->create()

The kobj here is a type-erased version of mdev_type, which is already
stored in the struct mdev_device being passed in. It was only ever used to
compute the type_group_id, which is now extracted directly from the mdev.
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Message-Id: <17-v2-d36939638fc6+d54-vfio2_jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/gpu/drm/i915/gvt/kvmgt.c

@@ -689,7 +689,7 @@ static void kvmgt_put_vfio_device(void *vgpu)
 	vfio_device_put(vdev->vfio_device);
 }
 
-static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
+static int intel_vgpu_create(struct mdev_device *mdev)
 {
 	struct intel_vgpu *vgpu = NULL;
 	struct intel_vgpu_type *type;

drivers/s390/cio/vfio_ccw_ops.c

@@ -110,7 +110,7 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
-static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
+static int vfio_ccw_mdev_create(struct mdev_device *mdev)
 {
 	struct vfio_ccw_private *private =
 		dev_get_drvdata(mdev_parent_dev(mdev));

drivers/s390/crypto/vfio_ap_ops.c

@@ -322,7 +322,7 @@ static void vfio_ap_matrix_init(struct ap_config_info *info,
 	matrix->adm_max = info->apxa ? info->Nd : 15;
 }
 
-static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
+static int vfio_ap_mdev_create(struct mdev_device *mdev)
 {
 	struct ap_matrix_mdev *matrix_mdev;
 

drivers/vfio/mdev/mdev_core.c

@@ -286,7 +286,7 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 		goto out_put_device;
 	}
 
-	ret = parent->ops->create(&type->kobj, mdev);
+	ret = parent->ops->create(mdev);
 	if (ret)
 		goto out_unlock;
 

include/linux/mdev.h

@@ -61,7 +61,6 @@ unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj);
  * @create:		Called to allocate basic resources in parent device's
  *			driver for a particular mediated device. It is
  *			mandatory to provide create ops.
- *			@kobj: kobject of type for which 'create' is called.
  *			@mdev: mdev_device structure on of mediated device
  *			      that is being created
  *			Returns integer: success (0) or error (< 0)
@@ -107,7 +106,7 @@ struct mdev_parent_ops {
 	const struct attribute_group **mdev_attr_groups;
 	struct attribute_group **supported_type_groups;
 
-	int     (*create)(struct kobject *kobj, struct mdev_device *mdev);
+	int     (*create)(struct mdev_device *mdev);
 	int     (*remove)(struct mdev_device *mdev);
 	int     (*open)(struct mdev_device *mdev);
 	void    (*release)(struct mdev_device *mdev);

samples/vfio-mdev/mbochs.c

@@ -506,7 +506,7 @@ static int mbochs_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mbochs_create(struct mdev_device *mdev)
 {
 	const struct mbochs_type *type =
 		&mbochs_types[mdev_get_type_group_id(mdev)];

samples/vfio-mdev/mdpy.c

@@ -216,7 +216,7 @@ static int mdpy_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mdpy_create(struct mdev_device *mdev)
 {
 	const struct mdpy_type *type =
 		&mdpy_types[mdev_get_type_group_id(mdev)];

samples/vfio-mdev/mtty.c

@@ -708,7 +708,7 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count,
 	return ret;
 }
 
-static int mtty_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mtty_create(struct mdev_device *mdev)
 {
 	struct mdev_state *mdev_state;
 	int nr_ports = mdev_get_type_group_id(mdev) + 1;