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authorMichael S. Tsirkin <mst@redhat.com>2015-01-13 17:34:58 +0300
committerRusty Russell <rusty@rustcorp.com.au>2015-01-21 08:58:55 +0300
commitd3f5f065603705cd4275d57324c49e391f786b5e (patch)
tree8bf7e4230355ec31f9d96d727a4a0b4a42e8acf9 /drivers/virtio
parent3909213cfd9224cb1827d557fb6eb5ebdb8ddcbe (diff)
downloadlinux-d3f5f065603705cd4275d57324c49e391f786b5e.tar.xz
virtio_pci_modern: support devices with no config
Virtio 1.0 spec lists device config as optional. Set get/set callbacks to NULL. Drivers can check that and fail gracefully. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_pci_modern.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 0e54cc88fdf5..68ebc204e3ea 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -422,6 +422,21 @@ static void del_vq(struct virtio_pci_vq_info *info)
free_pages_exact(info->queue, vring_pci_size(info->num));
}
+static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
+ .get = NULL,
+ .set = NULL,
+ .generation = vp_generation,
+ .get_status = vp_get_status,
+ .set_status = vp_set_status,
+ .reset = vp_reset,
+ .find_vqs = vp_modern_find_vqs,
+ .del_vqs = vp_del_vqs,
+ .get_features = vp_get_features,
+ .finalize_features = vp_finalize_features,
+ .bus_name = vp_bus_name,
+ .set_vq_affinity = vp_set_vq_affinity,
+};
+
static const struct virtio_config_ops virtio_pci_config_ops = {
.get = vp_get,
.set = vp_set,
@@ -652,9 +667,11 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
&vp_dev->device_len);
if (!vp_dev->device)
goto err_map_device;
- }
- vp_dev->vdev.config = &virtio_pci_config_ops;
+ vp_dev->vdev.config = &virtio_pci_config_ops;
+ } else {
+ vp_dev->vdev.config = &virtio_pci_config_nodev_ops;
+ }
vp_dev->config_vector = vp_config_vector;
vp_dev->setup_vq = setup_vq;