legacy_apps: zynqmp_r5: introduce rpmsg vdev config space

vdev config space can be used for various rpmsg virtio configurations
such as rpmsg tx and rx single buf size.

Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>

Author: tnmysh

examples/legacy_apps/machine/xlnx/zynqmp_r5/rsc_table.c

@@ -58,14 +58,23 @@ struct remote_resource_table __resource resources = {
 
 	/* Virtio device entry */
 	.rpmsg_vdev = {
-		RSC_VDEV, VIRTIO_ID_RPMSG_, 31, RPMSG_VDEV_DFEATURES, 0, 0, 0,
+		RSC_VDEV, VIRTIO_ID_RPMSG_, 31, RPMSG_VDEV_DFEATURES, 0,
+		/* vdev config space len */
+		sizeof(struct rpmsg_virtio_config), 0,
 		NUM_VRINGS, {0, 0},
 	},
 
 	/* Vring rsc entry - part of vdev rsc entry */
 	{RING_TX, VRING_ALIGN, VRING_SIZE, 1, 0},
 	{RING_RX, VRING_ALIGN, VRING_SIZE, 2, 0},
-
+	/* vdev config space */
+	.vdev_config = {
+		.version = 1,
+		.size = (uint16_t)sizeof(struct rpmsg_virtio_config)
+		.h2r_buf_size = 256, /* host to remote, i.e. tx for host */
+		.r2h_buf_size = 128, /* remote to host, i.e. rx for host */
+		.split_shpool = false
+	},
 	/* trace buffer for logs, accessible via debugfs */
 	.rsc_trace = {
 		.type =		RSC_TRACE,

examples/legacy_apps/machine/xlnx/zynqmp_r5/rsc_table.h

@@ -34,6 +34,7 @@ struct remote_resource_table {
 	struct fw_rsc_vdev rpmsg_vdev;
 	struct fw_rsc_vdev_vring rpmsg_vring0;
 	struct fw_rsc_vdev_vring rpmsg_vring1;
+	struct rpmsg_virtio_config vdev_config;
 	struct fw_rsc_trace rsc_trace;
 }__attribute__((packed, aligned(0x100)));