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SubjectRe: [PATCH 06/10] rpmsg: Turn name service into a stand alone driver
On Mon, Sep 21, 2020 at 06:09:56PM -0600, Mathieu Poirier wrote:
> From: Arnaud Pouliquen <arnaud.pouliquen@st.com>
>
> Make the RPMSG name service announcement a stand alone driver so that it
> can be reused by other subsystems. It is also the first step in making the
> functionatlity transport independent, i.e that is not tied to virtIO.
>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> ---
> drivers/rpmsg/Kconfig | 8 +++
> drivers/rpmsg/Makefile | 1 +
> drivers/rpmsg/rpmsg_internal.h | 18 ++++++
> drivers/rpmsg/rpmsg_ns.c | 110 +++++++++++++++++++++++++++++++++
> 4 files changed, 137 insertions(+)
> create mode 100644 drivers/rpmsg/rpmsg_ns.c
>
> diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig
> index f96716893c2a..c3fc75e6514b 100644
> --- a/drivers/rpmsg/Kconfig
> +++ b/drivers/rpmsg/Kconfig
> @@ -15,6 +15,14 @@ config RPMSG_CHAR
> in /dev. They make it possible for user-space programs to send and
> receive rpmsg packets.
>
> +config RPMSG_NS
> + tristate "RPMSG name service announcement"
> + depends on RPMSG
> + help
> + Say Y here to enable the support of the name service announcement
> + channel that probes the associated RPMsg device on remote endpoint
> + service announcement.
> +
> config RPMSG_MTK_SCP
> tristate "MediaTek SCP"
> depends on MTK_SCP
> diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile
> index ffe932ef6050..8d452656f0ee 100644
> --- a/drivers/rpmsg/Makefile
> +++ b/drivers/rpmsg/Makefile
> @@ -1,6 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0
> obj-$(CONFIG_RPMSG) += rpmsg_core.o
> obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o
> +obj-$(CONFIG_RPMSG_NS) += rpmsg_ns.o
> obj-$(CONFIG_RPMSG_MTK_SCP) += mtk_rpmsg.o
> qcom_glink-objs := qcom_glink_native.o qcom_glink_ssr.o
> obj-$(CONFIG_RPMSG_QCOM_GLINK) += qcom_glink.o
> diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
> index 3ea9cec26fc0..04e6cb287e18 100644
> --- a/drivers/rpmsg/rpmsg_internal.h
> +++ b/drivers/rpmsg/rpmsg_internal.h
> @@ -15,6 +15,7 @@
> #include <linux/idr.h>
> #include <linux/mutex.h>
> #include <linux/rpmsg.h>
> +#include <linux/rpmsg_ns.h>
> #include <linux/types.h>
> #include <linux/virtio.h>
> #include <linux/wait.h>
> @@ -164,4 +165,21 @@ static inline int rpmsg_chrdev_register_device(struct rpmsg_device *rpdev)
> return rpmsg_register_device(rpdev);
> }
>
> +/**
> + * rpmsg_ns_register_device() - register name service device based on rpdev
> + * @rpdev: prepared rpdev to be used for creating endpoints
> + *
> + * This function wraps rpmsg_register_device() preparing the rpdev for use as
> + * basis for the rpmsg name service device.
> + */
> +static inline int rpmsg_ns_register_device(struct rpmsg_device *rpdev)
> +{
> + strcpy(rpdev->id.name, "rpmsg_ns");
> + rpdev->driver_override = "rpmsg_ns";
> + rpdev->src = RPMSG_NS_ADDR;
> + rpdev->dst = RPMSG_NS_ADDR;
> +
> + return rpmsg_register_device(rpdev);
> +}
> +
> #endif
> diff --git a/drivers/rpmsg/rpmsg_ns.c b/drivers/rpmsg/rpmsg_ns.c
> new file mode 100644
> index 000000000000..b3318bf84433
> --- /dev/null
> +++ b/drivers/rpmsg/rpmsg_ns.c
> @@ -0,0 +1,110 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) STMicroelectronics 2020 - All Rights Reserved
> + */
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/rpmsg.h>
> +#include <linux/rpmsg_ns.h>
> +#include <linux/virtio_config.h>
> +#include "rpmsg_internal.h"
> +
> +/* Invoked when a name service announcement arrives */
> +static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,
> + void *priv, u32 src)
> +{
> + struct rpmsg_ns_msg *msg = data;
> + struct rpmsg_device *newch;
> + struct rpmsg_channel_info chinfo;
> + struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);

Let's not do this, non-VirtIO RPMsg drivers shouldn't need this struct.

> + struct virtproc_info *vrp = vch->vrp;
> + struct device *dev = &vrp->vdev->dev;
> + int ret;
> +
> +#if defined(CONFIG_DYNAMIC_DEBUG)
> + dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1,
> + data, len, true);
> +#endif
> +
> + if (len != sizeof(*msg)) {
> + dev_err(dev, "malformed ns msg (%d)\n", len);
> + return -EINVAL;
> + }
> +
> + /* Don't trust the remote processor for null terminating the name */
> + msg->name[RPMSG_NAME_SIZE - 1] = '\0';
> +
> + strncpy(chinfo.name, msg->name, sizeof(chinfo.name));
> + chinfo.src = RPMSG_ADDR_ANY;
> + chinfo.dst = virtio32_to_cpu(vrp->vdev, msg->addr);
> +
> + dev_info(dev, "%sing channel %s addr 0x%x\n",
> + virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY ?
> + "destroy" : "creat", msg->name, chinfo.dst);
> +
> + if (virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY) {
> + ret = rpmsg_release_channel(rpdev, &chinfo);
> + if (ret)
> + dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);
> + } else {
> + newch = rpmsg_create_channel(rpdev, &chinfo);
> + if (!newch)
> + dev_err(dev, "rpmsg_create_channel failed\n");
> + }
> +
> + return 0;
> +}
> +
> +static int rpmsg_ns_probe(struct rpmsg_device *rpdev)
> +{
> + struct rpmsg_channel_info ns_chinfo;

+ struct rpmsg_channel_info ns_chinfo = {
+ .src = RPMSG_NS_ADDR,
+ .dst = RPMSG_NS_ADDR,
+ .name = "name_service",
+ };

Thanks
Guennadi

> + struct rpmsg_endpoint *ns_ept;
> +
> + ns_chinfo.src = RPMSG_NS_ADDR;
> + ns_chinfo.dst = RPMSG_NS_ADDR;
> + strcpy(ns_chinfo.name, "name_service");
> +
> + /*
> + * Create the NS announcement service endpoint associated to the RPMsg
> + * device. The endpoint will be automatically destroyed when the RPMsg
> + * device will be deleted.
> + */
> + ns_ept = rpmsg_create_ept(rpdev, rpmsg_ns_cb, NULL, ns_chinfo);
> + if (!ns_ept) {
> + dev_err(&rpdev->dev, "failed to create the ns ept\n");
> + return -ENOMEM;
> + }
> + rpdev->ept = ns_ept;
> +
> + return 0;
> +}
> +
> +static struct rpmsg_driver rpmsg_ns_driver = {
> + .drv.name = "rpmsg_ns",
> + .probe = rpmsg_ns_probe,
> +};
> +
> +static int rpmsg_ns_init(void)
> +{
> + int ret;
> +
> + ret = register_rpmsg_driver(&rpmsg_ns_driver);
> + if (ret < 0)
> + pr_err("%s: Failed to register rpmsg driver\n", __func__);
> +
> + return ret;
> +}
> +postcore_initcall(rpmsg_ns_init);
> +
> +static void rpmsg_ns_exit(void)
> +{
> + unregister_rpmsg_driver(&rpmsg_ns_driver);
> +}
> +module_exit(rpmsg_ns_exit);
> +
> +MODULE_DESCRIPTION("Name service announcement rpmsg Driver");
> +MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
> +MODULE_ALIAS("rpmsg_ns");
> +MODULE_LICENSE("GPL v2");
> --
> 2.25.1
>

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