linux-kernel - Re: [PATCH v2 1/3] arm64: dts: qcom: sc7280: Add memory region for audiopd

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Message-ID: <46caa88e-790b-4733-83bc-75ed6c7ca2d8@quicinc.com>
Date: Thu, 22 May 2025 18:44:21 +0800
From: Ling Xu <quic_lxu5@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
CC: <cros-qcom-dts-watchers@...omium.org>, <andersson@...nel.org>,
        <konradybcio@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <ekansh.gupta@....qualcomm.com>
Subject: Re: [PATCH v2 1/3] arm64: dts: qcom: sc7280: Add memory region for
 audiopd

在 5/20/2025 9:53 PM, Dmitry Baryshkov 写道:
> On Tue, May 20, 2025 at 02:41:22PM +0800, Ling Xu wrote:
>> 在 5/17/2025 5:47 AM, Dmitry Baryshkov 写道:
>>> On Fri, May 16, 2025 at 04:30:27PM +0530, Ling Xu wrote:
>>>> Add reserved memory region and VMIDs for audio PD dynamic loading and
>>>> remote heap memory requirements.
>>>
>>> Why? Was it not working without this heap?
>>
>> yes, it will not working without this heap.
>> Memory region is required for audio PD for dynamic loading and remote heap memory
>> requirements. For more info, please refer below patches, it has provided a more
>> detailed explanation.
>> https://lore.kernel.org/all/bb68da04-ef52-4172-8b6e-f4027bcc2786@oss.qualcomm.com/
>> https://lore.kernel.org/all/effea02f-6ffb-42e9-87df-081caafab728@oss.qualcomm.com/
> 
> This triggers a bunch of questions:
> 
> - What is audio PD?
> 
Audio PD is a protection domain which is running on DSP for audio
specific processing.
> - Is it a required component?
yes. it is needed wherever there is some audio use cases where 
DSP audio PD dynamic loading is needed.
> - For which platforms ?
> 
For platforms that require dynamic loading of DSP audio PD.
> - What happens if there is a memory region, but it is not used by the
>   driver (SM8650, SM8550).
> 
It won't be used.
>>
>>>>
>>>> Signed-off-by: Ling Xu <quic_lxu5@...cinc.com>
>>>> ---
>>>>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 11 +++++++++++
>>>>  1 file changed, 11 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>>>> index 8e86d75cc6b4..d9af79ff8c4e 100644
>>>> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>>>> @@ -188,6 +188,14 @@ rmtfs_mem: rmtfs@...00000 {
>>>>  			qcom,client-id = <1>;
>>>>  			qcom,vmid = <QCOM_SCM_VMID_MSS_MSA>;
>>>>  		};
>>>> +
>>>> +		adsp_rpc_remote_heap_mem: adsp-rpc-remote-heap {
>>>> +			compatible = "shared-dma-pool";
>>>> +			size = <0x0 0x800000>;
>>>> +			alignment = <0x0 0x100000>;
>>>> +			alloc-ranges = <0x0 0x80000000 0x0 0x40000000>;
>>>> +			no-map;
>>>> +		};
>>>>  	};
>>>>  
>>>>  	cpus {
>>>> @@ -3863,6 +3871,9 @@ fastrpc {
>>>>  					qcom,glink-channels = "fastrpcglink-apps-dsp";
>>>>  					label = "adsp";
>>>>  					qcom,non-secure-domain;
>>>> +					memory-region = <&adsp_rpc_remote_heap_mem>;
>>>> +					qcom,vmids = <QCOM_SCM_VMID_LPASS>,
>>>> +							  <QCOM_SCM_VMID_ADSP_HEAP>;
>>
>> Thanks. Will modify this.
>>
>>> Please align '<' vertically.
>>>
>>>>  					#address-cells = <1>;
>>>>  					#size-cells = <0>;
>>>>  
>>>> -- 
>>>> 2.34.1
>>>>
>>>
>>
>> -- 
>> Thx and BRs,
>> Ling Xu
>>
> 

-- 
Thx and BRs,
Ling Xu