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From: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To: Suzuki K Poulose <suzuki.poulose@arm.com>,
	gregkh@linuxfoundation.org, mathieu.poirier@linaro.org,
	leo.yan@linaro.org, alexander.shishkin@linux.intel.com,
	mike.leach@linaro.org, robh+dt@kernel.org,
	bjorn.andersson@linaro.org, devicetree@vger.kernel.org,
	david.brown@linaro.org, mark.rutland@arm.com
Cc: rnayak@codeaurora.org, marc.w.gonzalez@free.fr,
	linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
	sibis@codeaurora.org, vivek.gautam@codeaurora.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCHv8 2/5] arm64: dts: qcom: msm8998: Add Coresight support
Date: Thu, 18 Jul 2019 14:44:01 +0530
Message-ID: <4854b0f7-6a81-bc87-3e63-d2b7c68a44f6@codeaurora.org> (raw)
In-Reply-To: <3b192063-f31f-b861-d913-61d737cecc57@arm.com>

Hi Suzuki,

On 7/18/2019 1:58 PM, Suzuki K Poulose wrote:
> Hi Sai,
> 
> 
>          etr@6048000 {
>> +            compatible = "arm,coresight-tmc", "arm,primecell";
>> +            reg = <0x06048000 0x1000>;
>> +
>> +            clocks = <&rpmcc RPM_SMD_QDSS_CLK>, <&rpmcc 
>> RPM_SMD_QDSS_A_CLK>;
>> +            clock-names = "apb_pclk", "atclk";
>> +            arm,scatter-gather;
> 
> Please could you confirm that you have tested the scatter-gather mode 
> with ETR ? Either via perf/sysfs. Please could you share your results ? 
> Unless verified
> this is going to be fatal for the system.
> 
> Similarly for other platforms.
> 

Yes I have tested with scatter-gather mode with ETR on all platforms
which I have posted via sysfs(not perf) before on previous versions of 
this patch series and no issues were found. And I suppose this was
discussed in v2 of this patch series [1].

As said in one of the series initially [1], QCOM msm downstream kernels 
have been using scatter gather mode and we haven't seen any fatal issues.

[1] https://patchwork.kernel.org/patch/10769535/

Thanks,
Sai

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation

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Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-12 14:16 [PATCHv8 0/5] Add coresight support for SDM845, MSM8998 and MSM8996 Sai Prakash Ranjan
2019-07-12 14:16 ` [PATCHv8 1/5] arm64: dts: qcom: sdm845: Add Coresight support Sai Prakash Ranjan
2019-07-12 16:44   ` Suzuki K Poulose
2019-07-12 16:49     ` saiprakash.ranjan
2019-07-19  9:46   ` Suzuki K Poulose
2019-07-19 10:28     ` Sai Prakash Ranjan
2019-07-12 14:16 ` [PATCHv8 2/5] arm64: dts: qcom: msm8998: " Sai Prakash Ranjan
2019-07-18  8:28   ` Suzuki K Poulose
2019-07-18  9:14     ` Sai Prakash Ranjan [this message]
2019-07-18  9:37       ` Suzuki K Poulose
2019-07-18  9:53         ` Sai Prakash Ranjan
2019-07-12 14:16 ` [PATCHv8 3/5] arm64: dts: qcom: msm8996: " Sai Prakash Ranjan
2019-07-17 17:00   ` Mathieu Poirier
2019-07-18  5:47     ` Sai Prakash Ranjan
2019-07-18 15:31       ` Mathieu Poirier
2019-07-18 15:48         ` Bjorn Andersson
2019-07-12 14:16 ` [PATCHv8 4/5] coresight: etm4x: Add ETM PIDs for SDM845 and MSM8996 Sai Prakash Ranjan
2019-07-17 17:40   ` Mathieu Poirier
2019-07-12 14:16 ` [PATCHv8 5/5] coresight: cpu-debug: Add support for Qualcomm Kryo Sai Prakash Ranjan
2019-07-17 16:56   ` Mathieu Poirier
2019-07-21 14:35     ` Leo Yan
2019-07-22  5:48       ` Sai Prakash Ranjan

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