[PATCH v1 1/2] arm64: dts: qcom: lemans: enable audio ML offload memory and SMMU mappings

[Pratyush Meduri]

The audio ML (machine-learning) offload use case requires a contiguous,
physically addressable buffer shared with the audio DSP/SPF, and issues
DMA transactions through additional SMMU stream IDs that are not
covered by the existing ADSP mapping.

Add a dedicated reusable shared-dma-pool CMA region (16 MiB, 4 MiB
aligned) and wire it to the q6apm DAIs node via memory-region. A
dedicated pool guarantees the alignment and contiguity the DSP expects
and isolates these allocations from the default CMA region.

Under the EL2 (Gunyah/hypervisor) configuration the SMMU is fully
enforcing, so the ML transactions are otherwise blocked and faulted:

 arm-smmu 15000000.iommu: Blocked unknown Stream ID 0x3060
 arm-smmu 15000000.iommu: Blocked unknown Stream ID 0x3062

Add the ML-related stream IDs (0x3060 mask 0x9, 0x3062 mask 0x1) to the
remoteproc_adsp iommus property in the EL2 overlay so these buffers are
translated by the SMMU instead of being rejected.

Signed-off-by: Pratyush Meduri <pratyush.meduri@xxxxxxxxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/lemans-el2.dtso | 4 +++-
 arch/arm64/boot/dts/qcom/lemans.dtsi     | 9 +++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/lemans-el2.dtso b/arch/arm64/boot/dts/qcom/lemans-el2.dtso
index 621ad930cf54..5b477346ef90 100644
--- a/arch/arm64/boot/dts/qcom/lemans-el2.dtso
+++ b/arch/arm64/boot/dts/qcom/lemans-el2.dtso
@@ -19,7 +19,9 @@ &iris {
 };
 
 &remoteproc_adsp {
-	iommus = <&apps_smmu 0x3000 0x0>;
+	iommus = <&apps_smmu 0x3000 0x0>,
+		<&apps_smmu 0x3060 0x9>,
+		<&apps_smmu 0x3062 0x1>;
 };
 
 &remoteproc_cdsp0 {
diff --git a/arch/arm64/boot/dts/qcom/lemans.dtsi b/arch/arm64/boot/dts/qcom/lemans.dtsi
index 3b0539e27b51..060565113784 100644
--- a/arch/arm64/boot/dts/qcom/lemans.dtsi
+++ b/arch/arm64/boot/dts/qcom/lemans.dtsi
@@ -624,6 +624,14 @@ reserved-memory {
 		#size-cells = <2>;
 		ranges;
 
+		audio_cma_mem: qcom,audio-ml {
+			compatible = "shared-dma-pool";
+			alloc-ranges = <0x0 0x00000000 0x0 0xffffffff>;
+			reusable;
+			alignment = <0x0 0x400000>;
+			size = <0x0 0x1000000>;
+		};
+
 		sail_ss_mem: sail-ss@80000000 {
 			reg = <0x0 0x80000000 0x0 0x10000000>;
 			no-map;
@@ -8134,6 +8142,7 @@ q6apmbedai: bedais {
 						q6apmdai: dais {
 							compatible = "qcom,q6apm-dais";
 							iommus = <&apps_smmu 0x3001 0x0>;
+							memory-region = <&audio_cma_mem>;
 						};
 					};
 
-- 
2.34.1