vfio/pci: Use vfio_init/register/unregister_group_dev

pci already allocates a struct vfio_pci_device with exactly the same
lifetime as vfio_device, switch to the new API and embed vfio_device in
vfio_pci_device.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Liu Yi L <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Message-Id: <9-v3-225de1400dfc+4e074-vfio1_jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/pci/vfio_pci.c

@@ -2019,6 +2019,7 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto out_group_put;
 	}
 
+	vfio_init_group_dev(&vdev->vdev, &pdev->dev, &vfio_pci_ops, vdev);
 	vdev->pdev = pdev;
 	vdev->irq_type = VFIO_PCI_NUM_IRQS;
 	mutex_init(&vdev->igate);
@@ -2056,9 +2057,10 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		vfio_pci_set_power_state(vdev, PCI_D3hot);
 	}
 
-	ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
+	ret = vfio_register_group_dev(&vdev->vdev);
 	if (ret)
 		goto out_power;
+	dev_set_drvdata(&pdev->dev, vdev);
 	return 0;
 
 out_power:
@@ -2078,13 +2080,11 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 static void vfio_pci_remove(struct pci_dev *pdev)
 {
-	struct vfio_pci_device *vdev;
+	struct vfio_pci_device *vdev = dev_get_drvdata(&pdev->dev);
 
 	pci_disable_sriov(pdev);
 
-	vdev = vfio_del_group_dev(&pdev->dev);
-	if (!vdev)
-		return;
+	vfio_unregister_group_dev(&vdev->vdev);
 
 	vfio_pci_vf_uninit(vdev);
 	vfio_pci_reflck_put(vdev->reflck);

drivers/vfio/pci/vfio_pci_private.h

@@ -100,6 +100,7 @@ struct vfio_pci_mmap_vma {
 };
 
 struct vfio_pci_device {
+	struct vfio_device	vdev;
 	struct pci_dev		*pdev;
 	void __iomem		*barmap[PCI_STD_NUM_BARS];
 	bool			bar_mmap_supported[PCI_STD_NUM_BARS];