linux-kernel - Re: [PATCH 2/3] dt-bindings: reserved-memory: add linaro,secure-heap

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Date:   Fri, 5 Aug 2022 16:46:24 +0100
From:   Brian Starkey <brian.starkey@....com>
To:     Olivier Masse <olivier.masse@....com>
Cc:     sumit.semwal@...aro.org, benjamin.gaignard@...labora.com,
        christian.koenig@....com, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-kernel@...r.kernel.org, clement.faure@....com, nd@....com,
        robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: reserved-memory: add linaro,secure-heap

+Rob and devicetree list.

I don't know if this should be "linaro" or something more generic,
and also where previous discussions got to about DMA heaps in DT.

Cheers,
-Brian

On Fri, Aug 05, 2022 at 03:53:29PM +0200, Olivier Masse wrote:
> DMABUF Reserved memory definition for OP-TEE SDP feaure.
> 
> Signed-off-by: Olivier Masse <olivier.masse@....com>
> ---
>  .../reserved-memory/linaro,secure-heap.yaml   | 56 +++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/reserved-memory/linaro,secure-heap.yaml
> 
> diff --git a/Documentation/devicetree/bindings/reserved-memory/linaro,secure-heap.yaml b/Documentation/devicetree/bindings/reserved-memory/linaro,secure-heap.yaml
> new file mode 100644
> index 000000000000..80522a4e2989
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reserved-memory/linaro,secure-heap.yaml
> @@ -0,0 +1,56 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/reserved-memory/linaro,secure-heap.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Linaro Secure DMABUF Heap
> +
> +maintainers:
> +  - Olivier Masse <olivier.masse@....com>
> +
> +description:
> +  Linaro OP-TEE firmware needs a reserved memory for the
> +  Secure Data Path feature (aka SDP).
> +  The purpose is to provide a secure memory heap which allow
> +  non-secure OS to allocate/free secure buffers.
> +  The TEE is reponsible for protecting the SDP memory buffers.
> +  TEE Trusted Application can access secure memory references
> +  provided as parameters (DMABUF file descriptor).
> +
> +allOf:
> +  - $ref: "reserved-memory.yaml"
> +
> +properties:
> +  compatible:
> +    const: linaro,secure-heap
> +
> +  reg:
> +    description:
> +      Region of memory reserved for OP-TEE SDP feature
> +
> +  no-map:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description:
> +      Avoid creating a virtual mapping of the region as part of the OS'
> +      standard mapping of system memory.
> +
> +unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - no-map
> +
> +examples:
> +  - |
> +  reserved-memory {
> +    #address-cells = <2>;
> +    #size-cells = <2>;
> +
> +    sdp@...00000 {
> +      compatible = "linaro,secure-heap";
> +      no-map;
> +      reg = <0 0x3E800000 0 0x00400000>;
> +    };
> +  };
> -- 
> 2.25.0
>