virtio_pci: setup config vector indirectly
config vector setup is version specific, do it indirectly.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 68023e5..4de3cbc 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -89,6 +89,7 @@
const char *name,
u16 msix_vec);
void (*del_vq)(struct virtio_pci_vq_info *info);
+ u16 (*config_vector)(struct virtio_pci_device *vp_dev, u16 vector);
};
/* Constants for MSI-X */
@@ -271,6 +272,15 @@
return vp_vring_interrupt(irq, opaque);
}
+static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
+{
+ /* Setup the vector used for configuration events */
+ iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
+ /* Verify we had enough resources to assign the vector */
+ /* Will also flush the write out to device */
+ return ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
+}
+
static void vp_free_vectors(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
@@ -290,10 +300,7 @@
if (vp_dev->msix_enabled) {
/* Disable the vector used for configuration */
- iowrite16(VIRTIO_MSI_NO_VECTOR,
- vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
- /* Flush the write out to device */
- ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
+ vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
pci_disable_msix(vp_dev->pci_dev);
vp_dev->msix_enabled = 0;
@@ -357,9 +364,8 @@
goto error;
++vp_dev->msix_used_vectors;
- iowrite16(v, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
+ v = vp_dev->config_vector(vp_dev, v);
/* Verify we had enough resources to assign the vector */
- v = ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
if (v == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto error;
@@ -770,6 +776,7 @@
vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
vp_dev->vdev.id.device = pci_dev->subsystem_device;
+ vp_dev->config_vector = vp_config_vector;
vp_dev->setup_vq = setup_vq;
vp_dev->del_vq = del_vq;