linux-kernel - Re: [PATCH 3/6] rpmsg: glink: rpm: Wrap driver context

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Date:   Tue, 24 Jan 2023 23:10:55 -0800
From:   Chris Lew <quic_clew@...cinc.com>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] rpmsg: glink: rpm: Wrap driver context



On 1/9/2023 2:39 PM, Bjorn Andersson wrote:
> As with the SMEM driver update, wrap the RPM context in a struct to
> facilitate the upcoming changes of moving IRQ and mailbox registration
> to the driver.
> 
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---

Reviewed-by: Chris Lew <quic_clew@...cinc.com>

>   drivers/rpmsg/qcom_glink_rpm.c | 44 ++++++++++++++++++++--------------
>   1 file changed, 26 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/rpmsg/qcom_glink_rpm.c b/drivers/rpmsg/qcom_glink_rpm.c
> index f64f45d1a735..6443843df6ca 100644
> --- a/drivers/rpmsg/qcom_glink_rpm.c
> +++ b/drivers/rpmsg/qcom_glink_rpm.c
> @@ -53,6 +53,13 @@ struct glink_rpm_pipe {
>   	void __iomem *fifo;
>   };
>   
> +struct glink_rpm {
> +	struct qcom_glink *glink;
> +
> +	struct glink_rpm_pipe rx_pipe;
> +	struct glink_rpm_pipe tx_pipe;
> +};
> +
>   static size_t glink_rpm_rx_avail(struct qcom_glink_pipe *glink_pipe)
>   {
>   	struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe);
> @@ -257,8 +264,7 @@ static int glink_rpm_parse_toc(struct device *dev,
>   static int glink_rpm_probe(struct platform_device *pdev)
>   {
>   	struct qcom_glink *glink;
> -	struct glink_rpm_pipe *rx_pipe;
> -	struct glink_rpm_pipe *tx_pipe;
> +	struct glink_rpm *rpm;
>   	struct device_node *np;
>   	void __iomem *msg_ram;
>   	size_t msg_ram_size;
> @@ -266,9 +272,8 @@ static int glink_rpm_probe(struct platform_device *pdev)
>   	struct resource r;
>   	int ret;
>   
> -	rx_pipe = devm_kzalloc(&pdev->dev, sizeof(*rx_pipe), GFP_KERNEL);
> -	tx_pipe = devm_kzalloc(&pdev->dev, sizeof(*tx_pipe), GFP_KERNEL);
> -	if (!rx_pipe || !tx_pipe)
> +	rpm = devm_kzalloc(&pdev->dev, sizeof(*rpm), GFP_KERNEL);
> +	if (!rpm)
>   		return -ENOMEM;
>   
>   	np = of_parse_phandle(dev->of_node, "qcom,rpm-msg-ram", 0);
> @@ -283,36 +288,39 @@ static int glink_rpm_probe(struct platform_device *pdev)
>   		return -ENOMEM;
>   
>   	ret = glink_rpm_parse_toc(dev, msg_ram, msg_ram_size,
> -				  rx_pipe, tx_pipe);
> +				  &rpm->rx_pipe, &rpm->tx_pipe);
>   	if (ret)
>   		return ret;
>   
>   	/* Pipe specific accessors */
> -	rx_pipe->native.avail = glink_rpm_rx_avail;
> -	rx_pipe->native.peak = glink_rpm_rx_peak;
> -	rx_pipe->native.advance = glink_rpm_rx_advance;
> -	tx_pipe->native.avail = glink_rpm_tx_avail;
> -	tx_pipe->native.write = glink_rpm_tx_write;
> +	rpm->rx_pipe.native.avail = glink_rpm_rx_avail;
> +	rpm->rx_pipe.native.peak = glink_rpm_rx_peak;
> +	rpm->rx_pipe.native.advance = glink_rpm_rx_advance;
> +	rpm->tx_pipe.native.avail = glink_rpm_tx_avail;
> +	rpm->tx_pipe.native.write = glink_rpm_tx_write;
>   
> -	writel(0, tx_pipe->head);
> -	writel(0, rx_pipe->tail);
> +	writel(0, rpm->tx_pipe.head);
> +	writel(0, rpm->rx_pipe.tail);
>   
> -	glink = qcom_glink_native_probe(&pdev->dev,
> +	glink = qcom_glink_native_probe(dev,
>   					0,
> -					&rx_pipe->native,
> -					&tx_pipe->native,
> +					&rpm->rx_pipe.native,
> +					&rpm->tx_pipe.native,
>   					true);
>   	if (IS_ERR(glink))
>   		return PTR_ERR(glink);
>   
> -	platform_set_drvdata(pdev, glink);
> +	rpm->glink = glink;
> +
> +	platform_set_drvdata(pdev, rpm);
>   
>   	return 0;
>   }
>   
>   static int glink_rpm_remove(struct platform_device *pdev)
>   {
> -	struct qcom_glink *glink = platform_get_drvdata(pdev);
> +	struct glink_rpm *rpm = platform_get_drvdata(pdev);
> +	struct qcom_glink *glink = rpm->glink;
>   
>   	qcom_glink_native_remove(glink);
>