incubator-nuttx/openamp/0002-Negotiate-individual-buffer-size-dynamically.patch

From a12f4359e3d4382e31a0f6f6983184b635fd0611 Mon Sep 17 00:00:00 2001
From: anchao <anchao@pinecone.net>
Date: Mon, 10 Dec 2018 16:26:39 +0800
Subject: [PATCH 02/14] Negotiate individual buffer size dynamically

Change config type from fw_rsc_config to rpmsg_virtio_config
to avoid rpmsg_vitio.h couple with remoteproc.h.
If slave support VIRTIO_RPMSG_F_BUFSZ(0x04) feature, master
determine the buffer size from config space(first 8 bytes),
otherwise the default size(512 bytes) will be used.

Change-Id: Ief68ed298495296a9eff38448ce5661f188300c2
Signed-off-by: anchao <anchao@pinecone.net>
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Signed-off-by: wangyongrong <wangyongrong@xiaomi.com>
---
 lib/include/openamp/remoteproc.h   | 15 +++++++++++++++
 lib/include/openamp/rpmsg_virtio.h |  1 +
 lib/rpmsg/rpmsg_virtio.c           |  7 +++++++
 3 files changed, 23 insertions(+)

diff --git a/lib/include/openamp/remoteproc.h open-amp/lib/include/openamp/remoteproc.h
index 84bf233..abc5481 100644
--- a/lib/include/openamp/remoteproc.h
+++ open-amp/lib/include/openamp/remoteproc.h
@@ -361,6 +361,21 @@ struct fw_rsc_vendor {
 	uint32_t len;
 } METAL_PACKED_END;
 
+/** @brief Configuration space declaration ((if VIRTIO_RPMSG_F_BUFSZ)) */
+METAL_PACKED_BEGIN
+struct fw_rsc_config {
+	/** The host to remote buffer size */
+	uint32_t h2r_buf_size;
+
+	/** The remote to host buffer size */
+	uint32_t r2h_buf_size;
+
+	/** Reserve for the future use */
+	uint32_t reserved[14];
+
+	/** Put the customize config here */
+} METAL_PACKED_END;
+
 struct loader_ops;
 struct image_store_ops;
 struct remoteproc_ops;
diff --git a/lib/include/openamp/rpmsg_virtio.h open-amp/lib/include/openamp/rpmsg_virtio.h
index 6d6925f..d9cfa9b 100644
--- a/lib/include/openamp/rpmsg_virtio.h
+++ open-amp/lib/include/openamp/rpmsg_virtio.h
@@ -30,6 +30,7 @@ extern "C" {
 /* The feature bitmap for virtio rpmsg */
 #define VIRTIO_RPMSG_F_NS	0 /* RP supports name service notifications */
 #define VIRTIO_RPMSG_F_ACK	1 /* RP supports name service acknowledge */
+#define VIRTIO_RPMSG_F_BUFSZ	2 /* RP supports get buffer size from config space */
 
 #ifdef VIRTIO_CACHED_BUFFERS
 #warning "VIRTIO_CACHED_BUFFERS is deprecated, please use VIRTIO_USE_DCACHE"
diff --git a/lib/rpmsg/rpmsg_virtio.c open-amp/lib/rpmsg/rpmsg_virtio.c
index 820227e..94c4b95 100644
--- a/lib/rpmsg/rpmsg_virtio.c
+++ open-amp/lib/rpmsg/rpmsg_virtio.c
@@ -12,6 +12,7 @@
 #include <metal/sleep.h>
 #include <metal/utilities.h>
 #include <openamp/rpmsg_virtio.h>
+#include <openamp/remoteproc.h>
 #include <openamp/virtqueue.h>
 
 #include "rpmsg_internal.h"
@@ -790,6 +791,7 @@ int rpmsg_init_vdev_with_config(struct rpmsg_virtio_device *rvdev,
 	struct rpmsg_device *rdev;
 	const char *vq_names[RPMSG_NUM_VRINGS];
 	vq_callback callback[RPMSG_NUM_VRINGS];
+	struct fw_rsc_config fw_config;
 	uint32_t features;
 	int status;
 	unsigned int i;
@@ -836,6 +838,11 @@ int rpmsg_init_vdev_with_config(struct rpmsg_virtio_device *rvdev,
 		return status;
 	rdev->support_ns = !!(features & (1 << VIRTIO_RPMSG_F_NS));
 	rdev->support_ack = !!(features & (1 << VIRTIO_RPMSG_F_ACK));
+	if (features & (1 << VIRTIO_RPMSG_F_BUFSZ)) {
+		virtio_read_config(rvdev->vdev, 0, &fw_config, sizeof(fw_config));
+		rvdev->config.h2r_buf_size = fw_config.h2r_buf_size;
+		rvdev->config.r2h_buf_size = fw_config.r2h_buf_size;
+	}
 
 	if (VIRTIO_ROLE_IS_DRIVER(rvdev->vdev)) {
 		/*
-- 
2.34.1