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authorRusty Russell <rusty@rustcorp.com.au>2008-07-25 21:06:13 +0400
committerRusty Russell <rusty@rustcorp.com.au>2008-07-25 06:06:14 +0400
commite34f87256794b87e7f4a8f1812538be7b7b5214c (patch)
treeb91ffb6df4ac13ace269bef60ae16a1048b1fa73 /drivers/virtio
parentc624896e488ba2bff5ae497782cfb265c8b00646 (diff)
downloadlinux-e34f87256794b87e7f4a8f1812538be7b7b5214c.tar.xz
virtio: Add transport feature handling stub for virtio_ring.
To prepare for virtio_ring transport feature bits, hook in a call in all the users to manipulate them. This currently just clears all the bits, since it doesn't understand any features. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_pci.c3
-rw-r--r--drivers/virtio/virtio_ring.c16
2 files changed, 19 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 9855975a72a3..c7dc37c7cce9 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -99,6 +99,9 @@ static void vp_finalize_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+ /* Give virtio_ring a chance to accept features. */
+ vring_transport_features(vdev);
+
/* We only support 32 feature bits. */
BUILD_BUG_ON(ARRAY_SIZE(vdev->features) != 1);
iowrite32(vdev->features[0], vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES);
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 21d9a62767af..6eb5303fed11 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -18,6 +18,7 @@
*/
#include <linux/virtio.h>
#include <linux/virtio_ring.h>
+#include <linux/virtio_config.h>
#include <linux/device.h>
#ifdef DEBUG
@@ -323,4 +324,19 @@ void vring_del_virtqueue(struct virtqueue *vq)
}
EXPORT_SYMBOL_GPL(vring_del_virtqueue);
+/* Manipulates transport-specific feature bits. */
+void vring_transport_features(struct virtio_device *vdev)
+{
+ unsigned int i;
+
+ for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++) {
+ switch (i) {
+ default:
+ /* We don't understand this bit. */
+ clear_bit(i, vdev->features);
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(vring_transport_features);
+
MODULE_LICENSE("GPL");