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virtio: Add transport feature handling stub for virtio_ring.

Browse source 
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 <[email protected]>
This commit is contained in:
Rusty Russell 2008-07-25 12:06:13 -05:00
commit e34f872567
5 changed files with 27 additions and 0 deletions
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3
drivers/virtio/virtio_pci.c
View file

@ -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);

16
drivers/virtio/virtio_ring.c
View file

@ -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");