Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756132AbaJWQVT (ORCPT ); Thu, 23 Oct 2014 12:21:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34881 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753690AbaJWQVP (ORCPT ); Thu, 23 Oct 2014 12:21:15 -0400 Date: Thu, 23 Oct 2014 19:24:33 +0300 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Cornelia Huck , David Hildenbrand , Rusty Russell , Pawel Moll , Heinz Graalfs , virtualization@lists.linux-foundation.org Subject: [PATCH RFC v4 08/17] virtio: allow transports to get avail/used addresses Message-ID: <1414081380-14623-9-git-send-email-mst@redhat.com> References: <1414081380-14623-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1414081380-14623-1-git-send-email-mst@redhat.com> X-Mutt-Fcc: =sent Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Cornelia Huck For virtio-1, we can theoretically have a more complex virtqueue layout with avail and used buffers not on a contiguous memory area with the descriptor table. For now, it's fine for a transport driver to stay with the old layout: It needs, however, a way to access the locations of the avail/used rings so it can register them with the host. Reviewed-by: David Hildenbrand Signed-off-by: Cornelia Huck Signed-off-by: Michael S. Tsirkin --- include/linux/virtio.h | 3 +++ drivers/virtio/virtio_ring.c | 16 ++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 149284e..d6359a5 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -75,6 +75,9 @@ unsigned int virtqueue_get_vring_size(struct virtqueue *vq); bool virtqueue_is_broken(struct virtqueue *vq); +void *virtqueue_get_avail(struct virtqueue *vq); +void *virtqueue_get_used(struct virtqueue *vq); + /** * virtio_device - representation of a device using virtio * @index: unique position on the virtio bus diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index b311fa7..5c8aef8 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -827,4 +827,20 @@ void virtio_break_device(struct virtio_device *dev) } EXPORT_SYMBOL_GPL(virtio_break_device); +void *virtqueue_get_avail(struct virtqueue *_vq) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + return vq->vring.avail; +} +EXPORT_SYMBOL_GPL(virtqueue_get_avail); + +void *virtqueue_get_used(struct virtqueue *_vq) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + return vq->vring.used; +} +EXPORT_SYMBOL_GPL(virtqueue_get_used); + MODULE_LICENSE("GPL"); -- MST -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/