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

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Date:   Mon, 24 Aug 2020 16:44:46 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH 2/9] rpmsg: core: add channel creation internal API

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@...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
>