Commit 3a814fdf authored by Tiwei Bie's avatar Tiwei Bie Committed by David S. Miller

virtio_ring: disable packed ring on unsupported transports

Currently, ccw, vop and remoteproc need some legacy virtio
APIs to create or access virtio rings, which are not supported
by packed ring. So disable packed ring on these transports
for now.
Signed-off-by: default avatarTiwei Bie <tiwei.bie@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f51f9826
...@@ -129,6 +129,16 @@ static u64 vop_get_features(struct virtio_device *vdev) ...@@ -129,6 +129,16 @@ static u64 vop_get_features(struct virtio_device *vdev)
return features; return features;
} }
static void vop_transport_features(struct virtio_device *vdev)
{
/*
* Packed ring isn't enabled on virtio_vop for now,
* because virtio_vop uses vring_new_virtqueue() which
* creates virtio rings on preallocated memory.
*/
__virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED);
}
static int vop_finalize_features(struct virtio_device *vdev) static int vop_finalize_features(struct virtio_device *vdev)
{ {
unsigned int i, bits; unsigned int i, bits;
...@@ -141,6 +151,9 @@ static int vop_finalize_features(struct virtio_device *vdev) ...@@ -141,6 +151,9 @@ static int vop_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */ /* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev); vring_transport_features(vdev);
/* Give virtio_vop a chance to accept features. */
vop_transport_features(vdev);
memset_io(out_features, 0, feature_len); memset_io(out_features, 0, feature_len);
bits = min_t(unsigned, feature_len, bits = min_t(unsigned, feature_len,
sizeof(vdev->features)) * 8; sizeof(vdev->features)) * 8;
......
...@@ -214,6 +214,16 @@ static u64 rproc_virtio_get_features(struct virtio_device *vdev) ...@@ -214,6 +214,16 @@ static u64 rproc_virtio_get_features(struct virtio_device *vdev)
return rsc->dfeatures; return rsc->dfeatures;
} }
static void rproc_transport_features(struct virtio_device *vdev)
{
/*
* Packed ring isn't enabled on remoteproc for now,
* because remoteproc uses vring_new_virtqueue() which
* creates virtio rings on preallocated memory.
*/
__virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED);
}
static int rproc_virtio_finalize_features(struct virtio_device *vdev) static int rproc_virtio_finalize_features(struct virtio_device *vdev)
{ {
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
...@@ -224,6 +234,9 @@ static int rproc_virtio_finalize_features(struct virtio_device *vdev) ...@@ -224,6 +234,9 @@ static int rproc_virtio_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features */ /* Give virtio_ring a chance to accept features */
vring_transport_features(vdev); vring_transport_features(vdev);
/* Give virtio_rproc a chance to accept features. */
rproc_transport_features(vdev);
/* Make sure we don't have any features > 32 bits! */ /* Make sure we don't have any features > 32 bits! */
BUG_ON((u32)vdev->features != vdev->features); BUG_ON((u32)vdev->features != vdev->features);
......
...@@ -765,6 +765,17 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev) ...@@ -765,6 +765,17 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev)
return rc; return rc;
} }
static void ccw_transport_features(struct virtio_device *vdev)
{
/*
* Packed ring isn't enabled on virtio_ccw for now,
* because virtio_ccw uses some legacy accessors,
* e.g. virtqueue_get_avail() and virtqueue_get_used()
* which aren't available in packed ring currently.
*/
__virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED);
}
static int virtio_ccw_finalize_features(struct virtio_device *vdev) static int virtio_ccw_finalize_features(struct virtio_device *vdev)
{ {
struct virtio_ccw_device *vcdev = to_vc_device(vdev); struct virtio_ccw_device *vcdev = to_vc_device(vdev);
...@@ -791,6 +802,9 @@ static int virtio_ccw_finalize_features(struct virtio_device *vdev) ...@@ -791,6 +802,9 @@ static int virtio_ccw_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */ /* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev); vring_transport_features(vdev);
/* Give virtio_ccw a chance to accept features. */
ccw_transport_features(vdev);
features->index = 0; features->index = 0;
features->features = cpu_to_le32((u32)vdev->features); features->features = cpu_to_le32((u32)vdev->features);
/* Write the first half of the feature bits to the host. */ /* Write the first half of the feature bits to the host. */
......
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