[Linaro-mm-sig] Re: [EXT] Re: [PATCH 2/3] dt-bindings: reserved-memory: add linaro,secure-heap

Hi Brian,

It was part of a discussion during a Devicetree evolution meeting with Bill Mills from Linaro.

I've done some modification to OPTEE OS and OPTEE TEST to support dma buf: OPTEE OS https://github.com/OP-TEE/optee_os/commit/eb108a04369fbfaf60c03c0e00bbe9489a... https://github.com/OP-TEE/optee_os/commit/513b0748d46e7eefa17dadb204289e49dc...

OPTEE TEST https://github.com/OP-TEE/optee_test/commit/da5282a011b40621a2cf7a296c11a35c...

BR / Olivier

On ven., 2022-08-05 at 16:46 +0100, Brian Starkey wrote:

Caution: EXT Email

+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@nxp.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 +--- +$id: https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.... +$schema: https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree....

+title: Linaro Secure DMABUF Heap

+maintainers:

• • Olivier Masse olivier.masse@nxp.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@3e800000 {

•  compatible = "linaro,secure-heap";
  

•  no-map;
  

•  reg = <0 0x3E800000 0 0x00400000>;
  

• };
• };

-- 2.25.0