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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) Pinecone Inc. 2019
* Copyright (C) Xiang Xiao <xiaoxiang@pinecone.net>
* Copyright (C) Advanced Micro Devices, Inc. 2026
*/
#ifndef _LINUX_VIRTIO_RPMSG_H
#define _LINUX_VIRTIO_RPMSG_H
#include <linux/types.h>
#include <linux/virtio_types.h>
/* The feature bitmap for virtio rpmsg */
#define VIRTIO_RPMSG_F_NS 0 /* RP supports name service notifications */
#define VIRTIO_RPMSG_F_BUFSZ 1 /* RP advertises RX/TX buffer sizes from config space */
/* Version of struct virtio_rpmsg_config understood by this driver */
#define RPMSG_VDEV_CONFIG_V1 1
/**
* struct virtio_rpmsg_config - config space for rpmsg virtio device
*
* @version: version of this structure, currently %RPMSG_VDEV_CONFIG_V1.
* @size: size of this structure in bytes.
* @txbuf_size: Tx buf size from remote's view. For Linux this is rx buf size.
* @rxbuf_size: Rx buf size from remote's view. For Linux this is tx buf size.
*
* This is the configuration structure shared by the device and the driver,
* read when %VIRTIO_RPMSG_F_BUFSZ is negotiated. The fields are laid out so
* the structure is naturally 32-bit aligned.
*/
struct virtio_rpmsg_config {
u8 version;
__virtio16 size;
/* The tx/rx individual buffer size (if VIRTIO_RPMSG_F_BUFSZ) */
__virtio32 txbuf_size;
__virtio32 rxbuf_size;
} __packed;
#endif /* _LINUX_VIRTIO_RPMSG_H */
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