linux-kernel - [PATCH 09/10] rpmsg: virtio: Make endianness conversion virtIO specific

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Date:   Mon, 21 Sep 2020 18:09:59 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     ohad@...ery.com, bjorn.andersson@...aro.org,
        guennadi.liakhovetski@...ux.intel.com
Cc:     loic.pallardy@...com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 09/10] rpmsg: virtio: Make endianness conversion virtIO specific

Introduce rpmsg operations to make byte conversion specific to the
virtIO transport layer, therefore avoiding the protocol code from
being aware of the virtIO transport specification.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 drivers/rpmsg/virtio_rpmsg_bus.c | 36 ++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 1c0be0ee790c..15cc383a85cc 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -157,6 +157,38 @@ static struct rpmsg_endpoint *__rpmsg_create_ept(struct virtproc_info *vrp,
 	return NULL;
 }
 
+static u16 virtio_rpmsg_transport16_to_cpu(struct rpmsg_device *rpdev, u16 val)
+{
+	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+	struct virtproc_info *vrp = vch->vrp;
+
+	return virtio16_to_cpu(vrp->vdev, val);
+}
+
+static u16 virtio_rpmsg_cpu_to_transport16(struct rpmsg_device *rpdev, u16 val)
+{
+	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+	struct virtproc_info *vrp = vch->vrp;
+
+	return cpu_to_virtio16(vrp->vdev, val);
+}
+
+static u32 virtio_rpmsg_transport32_to_cpu(struct rpmsg_device *rpdev, u32 val)
+{
+	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+	struct virtproc_info *vrp = vch->vrp;
+
+	return virtio32_to_cpu(vrp->vdev, val);
+}
+
+static u32 virtio_rpmsg_cpu_to_transport32(struct rpmsg_device *rpdev, u32 val)
+{
+	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+	struct virtproc_info *vrp = vch->vrp;
+
+	return cpu_to_virtio32(vrp->vdev, val);
+}
+
 static struct rpmsg_device *
 virtio_rpmsg_create_channel(struct rpmsg_device *rpdev,
 			    struct rpmsg_channel_info *chinfo)
@@ -268,6 +300,10 @@ static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev)
 }
 
 static const struct rpmsg_device_ops virtio_rpmsg_ops = {
+	.transport16_to_cpu = virtio_rpmsg_transport16_to_cpu,
+	.cpu_to_transport16 = virtio_rpmsg_cpu_to_transport16,
+	.transport32_to_cpu = virtio_rpmsg_transport32_to_cpu,
+	.cpu_to_transport32 = virtio_rpmsg_cpu_to_transport32,
 	.create_channel = virtio_rpmsg_create_channel,
 	.release_channel = virtio_rpmsg_release_channel,
 	.create_ept = virtio_rpmsg_create_ept,
-- 
2.25.1