linux-kernel - Re: [PATCH 3/4] misc: fastrpc: Set channel as secure

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Date:   Wed, 29 Sep 2021 15:07:02 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Jeya R <jeyr@...eaurora.org>, linux-arm-msm@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        fastrpc.upstream@....qualcomm.com
Subject: Re: [PATCH 3/4] misc: fastrpc: Set channel as secure



On 24/09/2021 13:19, Jeya R wrote:
> Set channel as secure based on domain ID and secure domain DT property.
> All DSP domains other than CDSP are set as secure by default and for
> CDSP domain, secure flag is set if property is added to DT file.
> 
> Signed-off-by: Jeya R <jeyr@...eaurora.org>
> ---
>   drivers/misc/fastrpc.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index 07c41a5..631713d 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -216,6 +216,7 @@ struct fastrpc_channel_ctx {
>   	struct miscdevice miscdev;
>   	struct miscdevice securedev;
>   	struct kref refcount;
> +	bool secure;
>   };
>   
>   struct fastrpc_user {
> @@ -1646,6 +1647,12 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
>   	if (!data)
>   		return -ENOMEM;
>   
> +	if (domain_id != CDSP_DOMAIN_ID)
> +		data->secure = true;
> +	else
> +		data->secure = of_property_read_bool(rdev->of_node,
> +				"qcom,secure-domain");
> +

This whole logic of marking domains secured based on dsp type needs some 
explanation.

--srini


>   	data->miscdev.minor = MISC_DYNAMIC_MINOR;
>   	data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
>   					    domains[domain_id]);
>