linux-kernel - Re: [PATCH 10/10] arm64: dts: qcom: sdm845: add LLCC BWMON

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Date:   Fri, 22 Jul 2022 19:29:21 -0500
From:   Steev Klimaszewski <steev@...i.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Georgi Djakov <djakov@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Rajendra Nayak <quic_rjendra@...cinc.com>
Subject: Re: [PATCH 10/10] arm64: dts: qcom: sdm845: add LLCC BWMON


On 7/22/22 12:30 PM, Krzysztof Kozlowski wrote:
> On 22/07/2022 03:22, Steev Klimaszewski wrote:
>> Hi Krzysztof,
>>
>> On 7/20/22 2:28 PM, Krzysztof Kozlowski wrote:
>>> The SDM845 comes with few instances of Bandwidth Monitor.  The already
>>> supported one monitors traffic between CPU and Last Level Cache
>>> Controller (LLCC) and in downstream sources is called BWMON v4 (or v4 of
>>> register layout).
>>>
>>> SDM845 also has also BWMON instance measuring traffic between LLCC and
>>> memory with different register layout: called v5.
>>>
>>> Cc: Rajendra Nayak <quic_rjendra@...cinc.com>
>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>> ---
>>>    arch/arm64/boot/dts/qcom/sdm845.dtsi | 37 ++++++++++++++++++++++++++++
>>>    1 file changed, 37 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>> index fe14f7e7523b..4aab464e2bd6 100644
>>> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>> @@ -2053,6 +2053,43 @@ llcc: system-cache-controller@...0000 {
>>>    			interrupts = <GIC_SPI 582 IRQ_TYPE_LEVEL_HIGH>;
>>>    		};
>>>    
>>> +		pmu@...a000 {
>>> +			compatible = "qcom,sdm845-llcc-bwmon";
>>> +			reg = <0 0x0114a000 0 0x1000>;
>>> +			interrupts = <GIC_SPI 580 IRQ_TYPE_LEVEL_HIGH>;
>>> +			interconnects = <&mem_noc MASTER_LLCC 3 &mem_noc SLAVE_EBI1 3>;
>>> +
>>> +			operating-points-v2 = <&llcc_bwmon_opp_table>;
>>> +
>>> +			llcc_bwmon_opp_table: opp-table {
>>> +				compatible = "operating-points-v2";
>>> +
>>> +				/*
>>> +				 * The interconnect path bandwidth taken from
>>> +				 * cpu4_opp_table bandwidth for gladiator_noc-mem_noc
>>> +				 * interconnect.  This also matches the
>>> +				 * bandwidth table of qcom,llccbw (qcom,bw-tbl,
>>> +				 * bus width: 4 bytes) from msm-4.9 downstream
>>> +				 * kernel.
>>> +				 */
>>> +				opp-0 {
>>> +					opp-peak-kBps = <800000>;
>>> +				};
>>> +				opp-1 {
>>> +					opp-peak-kBps = <1804000>;
>>> +				};
>>> +				opp-2 {
>>> +					opp-peak-kBps = <3072000>;
>>> +				};
>>> +				opp-3 {
>>> +					opp-peak-kBps = <5412000>;
>>> +				};
>>> +				opp-4 {
>>> +					opp-peak-kBps = <7216000>;
>>> +				};
>>> +			};
>>> +		};
>>> +
>>>    		pmu@...6400 {
>>>    			compatible = "qcom,sdm845-bwmon", "qcom,msm8998-bwmon";
>>>    			reg = <0 0x01436400 0 0x600>;
>>
>> With this series applied, testing on a Lenovo Yoga C630, which has an
>> SDM850, I see the following:
>>
>> [    3.673660] qcom-bwmon 114a000.pmu: can't request region for resource
>> [mem 0x0114a000-0x0114afff]
>> [    3.673673] qcom-bwmon 114a000.pmu: error -EBUSY: failed to map bwmon
>> registers
>> [    3.673678] qcom-bwmon: probe of 114a000.pmu failed with error -16
>>
> Thanks for the report. What are you running there? `uname -r`? Maybe
> your secure world uses it?
>
> Best regards,
> Krzysztof

Currently it's 5.19.0-rc7 (torvalds tree at 4ba1329c) with a few extra 
patches on top, the bwmon set included.  It's possible that secure world 
uses it, but I do not know enough about that to say one way or the other.

-- steev