linux-kernel - Re: [PATCH V5 3/5] rpmsg: glink: Add support for rpmsg glink chrdev

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Message-ID: <20200513215609.GB8328@xps15>
Date:   Wed, 13 May 2020 15:56:09 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Arun Kumar Neelakantam <aneela@...eaurora.org>
Cc:     ohad@...ery.com, bjorn.andersson@...aro.org, clew@...eaurora.org,
        sricharan@...eaurora.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andy Gross <agross@...nel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH V5 3/5] rpmsg: glink: Add support for rpmsg glink chrdev

On Wed, May 13, 2020 at 10:40:04AM +0530, Arun Kumar Neelakantam wrote:
> From: Chris Lew <clew@...eaurora.org>
> 
> RPMSG provides a char device interface to userspace. Probe the rpmsg
> chrdev channel to enable the rpmsg_ctrl device creation on glink
> transports.
> 
> Signed-off-by: Chris Lew <clew@...eaurora.org>
> Signed-off-by: Arun Kumar Neelakantam <aneela@...eaurora.org>
> ---
>  drivers/rpmsg/qcom_glink_native.c | 40 ++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 39 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
> index 604f11f..3a7f87c 100644
> --- a/drivers/rpmsg/qcom_glink_native.c
> +++ b/drivers/rpmsg/qcom_glink_native.c
> @@ -1178,7 +1178,7 @@ static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
>  	__be32 *val = defaults;
>  	int size;
>  
> -	if (glink->intentless)
> +	if (glink->intentless || !completion_done(&channel->open_ack))

Please move this to patch 01.

>  		return 0;
>  
>  	prop = of_find_property(np, "qcom,intents", NULL);
> @@ -1574,6 +1574,40 @@ static void qcom_glink_cancel_rx_work(struct qcom_glink *glink)
>  		kfree(dcmd);
>  }
>  
> +static void qcom_glink_device_release(struct device *dev)
> +{
> +	struct rpmsg_device *rpdev = to_rpmsg_device(dev);
> +	struct glink_channel *channel = to_glink_channel(rpdev->ept);
> +
> +	/* Release qcom_glink_alloc_channel() reference */
> +	kref_put(&channel->refcount, qcom_glink_channel_release);
> +	kfree(rpdev);
> +}
> +
> +static int qcom_glink_create_chrdev(struct qcom_glink *glink)
> +{
> +	struct rpmsg_device *rpdev;
> +	struct glink_channel *channel;
> +
> +	rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
> +	if (!rpdev)
> +		return -ENOMEM;
> +
> +	channel = qcom_glink_alloc_channel(glink, "rpmsg_chrdev");
> +	if (IS_ERR(channel)) {
> +		kfree(rpdev);
> +		return PTR_ERR(channel);
> +	}
> +	channel->rpdev = rpdev;
> +
> +	rpdev->ept = &channel->ept;
> +	rpdev->ops = &glink_device_ops;
> +	rpdev->dev.parent = glink->dev;
> +	rpdev->dev.release = qcom_glink_device_release;
> +
> +	return rpmsg_chrdev_register_device(rpdev);
> +}
> +
>  struct qcom_glink *qcom_glink_native_probe(struct device *dev,
>  					   unsigned long features,
>  					   struct qcom_glink_pipe *rx,
> @@ -1633,6 +1667,10 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev,
>  	if (ret)
>  		return ERR_PTR(ret);
>  
> +	ret = qcom_glink_create_chrdev(glink);
> +	if (ret)
> +		dev_err(glink->dev, "failed to register chrdev\n");
> +
>  	return glink;
>  }
>  EXPORT_SYMBOL_GPL(qcom_glink_native_probe);
> -- 
> 2.7.4