Re: [PATCH 2/9] rpmsg: core: add channel creation internal API

Mathieu Poirier
2020-08-24T22:44:53Z

Hi Arnaud,

On Fri, Jul 31, 2020 at 01:47:25PM +0200, Arnaud Pouliquen wrote:
> Add the channel creation API as a first step to be able to define the
> name service announcement as a rpmsg driver independent from the RPMsg
> virtio bus.
>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
> ---
> drivers/rpmsg/rpmsg_core.c | 37 ++++++++++++++++++++++++++++++++++
> drivers/rpmsg/rpmsg_internal.h | 12 +++++++++++
> 2 files changed, 49 insertions(+)
>
> diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
> index a6361cad608b..ae7da4a2e528 100644
> --- a/drivers/rpmsg/rpmsg_core.c
> +++ b/drivers/rpmsg/rpmsg_core.c
> @@ -20,6 +20,43 @@
>
> #include "rpmsg_internal.h"
>
> +/**
> + * rpmsg_create_channel() - create a new rpmsg channel
> + * using its name and address info.
> + * @rpdev: rpmsg driver
> + * @chinfo: channel_info to bind
> + *
> + * Returns a pointer to the new rpmsg device on success, or NULL on error.
> + */
> +struct rpmsg_device *
> + rpmsg_create_channel(struct rpmsg_device *rpdev,
> + struct rpmsg_channel_info *chinfo)
> +{
> + if (WARN_ON(!rpdev) || !rpdev->ops->create_channel)
> + return NULL;

Ok for the WARN_ON(). In another if(), I would check for ops and
ops->create_channel(). Same for the release() operation.

> +
> + return rpdev->ops->create_channel(rpdev, chinfo);
> +}
> +EXPORT_SYMBOL(rpmsg_create_channel);
> +
> +/**
> + * rpmsg_release_channel() - release a rpmsg channel
> + * using its name and address info.
> + * @rpdev: rpmsg driver
> + * @chinfo: channel_info to bind
> + *
> + * Returns a pointer to the new rpmsg device on success, or NULL on error.
> + */
> +int rpmsg_release_channel(struct rpmsg_device *rpdev,
> + struct rpmsg_channel_info *chinfo)
> +{
> + if (WARN_ON(!rpdev) || !rpdev->ops->release_channel)
> + return 0;
> +
> + return rpdev->ops->release_channel(rpdev, chinfo);
> +}
> +EXPORT_SYMBOL(rpmsg_release_channel);
> +
> /**
> * rpmsg_create_ept() - create a new rpmsg_endpoint
> * @rpdev: rpmsg channel device
> diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
> index 3fc83cd50e98..d5ab286d0e5e 100644
> --- a/drivers/rpmsg/rpmsg_internal.h
> +++ b/drivers/rpmsg/rpmsg_internal.h
> @@ -20,6 +20,8 @@
>
> /**
> * struct rpmsg_device_ops - indirection table for the rpmsg_device operations
> + * @create_channel: create backend-specific channel, optional
> + * @release_channel: release backend-specific channel, optional
> * @create_ept: create backend-specific endpoint, required
> * @announce_create: announce presence of new channel, optional
> * @announce_destroy: announce destruction of channel, optional
> @@ -29,6 +31,11 @@
> * advertise new channels implicitly by creating the endpoints.
> */
> struct rpmsg_device_ops {
> + struct rpmsg_device *(*create_channel)(struct rpmsg_device *rpdev,
> + struct rpmsg_channel_info *chinfo);
> + int (*release_channel)(struct rpmsg_device *rpdev,
> + struct rpmsg_channel_info *chinfo);
> +
> struct rpmsg_endpoint *(*create_ept)(struct rpmsg_device *rpdev,
> rpmsg_rx_cb_t cb, void *priv,
> struct rpmsg_channel_info chinfo);
> @@ -75,6 +82,11 @@ int rpmsg_unregister_device(struct device *parent,
> struct device *rpmsg_find_device(struct device *parent,
> struct rpmsg_channel_info *chinfo);
>
> +struct rpmsg_device *
> + rpmsg_create_channel(struct rpmsg_device *rpdev,
> + struct rpmsg_channel_info *chinfo);
> +int rpmsg_release_channel(struct rpmsg_device *rpdev,
> + struct rpmsg_channel_info *chinfo);
> /**
> * rpmsg_chrdev_register_device() - register chrdev device based on rpdev
> * @rpdev: prepared rpdev to be used for creating endpoints
> --
> 2.17.1
>