linux-kernel - [RFC PATCH 3/4] dt-bindings: reserved-memory: add linaro,restricted-heap

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Message-Id: <20240830070351.2855919-4-jens.wiklander@linaro.org>
Date: Fri, 30 Aug 2024 09:03:50 +0200
From: Jens Wiklander <jens.wiklander@...aro.org>
To: linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org,
	op-tee@...ts.trustedfirmware.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Cc: Olivier Masse <olivier.masse@....com>,
	Thierry Reding <thierry.reding@...il.com>,
	Yong Wu <yong.wu@...iatek.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Benjamin Gaignard <benjamin.gaignard@...labora.com>,
	Brian Starkey <Brian.Starkey@....com>,
	John Stultz <jstultz@...gle.com>,
	"T . J . Mercier" <tjmercier@...gle.com>,
	Christian König <christian.koenig@....com>,
	Sumit Garg <sumit.garg@...aro.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jens Wiklander <jens.wiklander@...aro.org>
Subject: [RFC PATCH 3/4] dt-bindings: reserved-memory: add linaro,restricted-heap

From: Olivier Masse <olivier.masse@....com>

DMABUF reserved memory definition for OP-TEE secure data path feature.

Signed-off-by: Olivier Masse <olivier.masse@....com>
Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
---
 .../linaro,restricted-heap.yaml               | 56 +++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/linaro,restricted-heap.yaml

diff --git a/Documentation/devicetree/bindings/reserved-memory/linaro,restricted-heap.yaml b/Documentation/devicetree/bindings/reserved-memory/linaro,restricted-heap.yaml
new file mode 100644
index 000000000000..0ab87cf02775
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/linaro,restricted-heap.yaml
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/linaro,restricted-heap.yaml#
+$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 restricted memory heap which allow
+  the normal world OS (REE) to allocate/free restricted buffers.
+  The TEE is reponsible for protecting the SDP memory buffers.
+  TEE Trusted Application can access restricted memory references
+  provided as parameters (DMABUF file descriptor).
+
+allOf:
+  - $ref: "reserved-memory.yaml"
+
+properties:
+  compatible:
+    const: linaro,restricted-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,restricted-heap";
+      no-map;
+      reg = <0 0x3E800000 0 0x00400000>;
+    };
+  };
-- 
2.34.1