linux-kernel - Re: [PATCH v2 5/8] dt-bindings: misc: add property to support non-secure DSP

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Message-ID: <Ybdq4qAeqK8C8Yvc@ripper>
Date:   Mon, 13 Dec 2021 07:46:42 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     robh+dt@...nel.org, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, ekangupt@....qualcomm.com,
        jeyr@...eaurora.org, bkumar@....qualcomm.com,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 5/8] dt-bindings: misc: add property to support
 non-secure DSP

On Thu 09 Dec 04:06 PST 2021, Srinivas Kandagatla wrote:

> From: Jeya R <jeyr@...eaurora.org>
> 
> Add property to set DSP domain as non-secure.
> 
> ADSP/MDSP/SDSP are by default secured, where as CDSP can be either be
> secured/unsecured.
> non-secured Compute DSP would allow users to load unsigned process
> and run hexagon instructions, but limiting access to secured hardware
> within the DSP.
> 
> Based on this flag device nodes for secured and unsecured are created.
> 
> Signed-off-by: Jeya R <jeyr@...eaurora.org>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
> 
> This patch has dependency this yaml conversion patch:
> https://lore.kernel.org/lkml/20211208101508.24582-1-david@ixit.cz/T/
> 
>  Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> index f42ab208a7fc..f0df0a3bf69f 100644
> --- a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> +++ b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> @@ -29,6 +29,11 @@ properties:
>          - sdsp
>          - cdsp
>  
> +  qcom,non-secure-domain:
> +    type: boolean
> +    description: >
> +      Property to specify that dsp domain is non-secure.

"non-secure" feels vague, how about expressing it as "Specifies that the
domains of this DSP instance may run unsigned programs."

Perhaps even go so far to name the property
qcom,allow-unsigned-programs? (Or some other word for "program"?)

Regards,
Bjorn

> +
>    '#address-cells':
>      const: 1
>  
> -- 
> 2.21.0
>