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| author | Tanmay Shah <tanmay.shah@amd.com> | 2026-08-28 07:58:50 -0700 |
|---|---|---|
| committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2026-09-04 14:13:09 -0600 |
| commit | ca96ea25e51aeae45b0c947feb432fc74e2d1928 (patch) | |
| tree | 4c90d974341afb0935e867d5071177d255742987 /include/linux | |
| parent | 8727c3f3e24143a21c231bf64a375c44b949bdb0 (diff) | |
| download | linux-next-ca96ea25e51aeae45b0c947feb432fc74e2d1928.tar.gz linux-next-ca96ea25e51aeae45b0c947feb432fc74e2d1928.zip | |
rpmsg: virtio_rpmsg_bus: Get buffer size from config space
512 bytes isn't always suitable for all the cases, let firmware
maker decide the best value from the resource table. Enabled
by VIRTIO_RPMSG_F_BUFSZ feature bit.
Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
Acked-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/20260828145853.2843486-4-tanmay.shah@amd.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rpmsg/virtio_rpmsg.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/include/linux/rpmsg/virtio_rpmsg.h b/include/linux/rpmsg/virtio_rpmsg.h new file mode 100644 index 000000000000..0872cbca4593 --- /dev/null +++ b/include/linux/rpmsg/virtio_rpmsg.h @@ -0,0 +1,41 @@ +/* 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 */ |