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From: Thara Gopinath <thara.gopinath@linaro.org>
To: Steev Klimaszewski <steev@kali.org>,
	agross@kernel.org, bjorn.andersson@linaro.org,
	rui.zhang@intel.com, daniel.lezcano@linaro.org,
	viresh.kumar@linaro.org, rjw@rjwysocki.net, robh+dt@kernel.org
Cc: tdas@codeaurora.org, mka@chromium.org,
	linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [Patch v3 0/6] Introduce LMh driver for Qualcomm SoCs
Date: Tue, 27 Jul 2021 11:29:15 -0400	[thread overview]
Message-ID: <adfe4d6d-7433-23f2-bc57-d6fba2d8725b@linaro.org> (raw)
In-Reply-To: <c630a7a0-d1d0-d04c-8abf-2490c0932661@kali.org>



On 7/21/21 11:14 PM, Steev Klimaszewski wrote:
> Hi Thara!
> 
> On 7/8/21 7:06 AM, Thara Gopinath wrote:
>> Limits Management Hardware(LMh) is a hardware infrastructure on some
>> Qualcomm SoCs that can enforce temperature and current limits as programmed
>> by software for certain IPs like CPU. On many newer SoCs LMh is configured
>> by firmware/TZ and no programming is needed from the kernel side. But on
>> certain SoCs like sdm845 the firmware does not do a complete programming of
>> the h/w block. On such SoCs kernel software has to explicitly set up the
>> temperature limits and turn on various monitoring and enforcing algorithms
>> on the hardware.
>>
>> Introduce support for enabling and programming various limit settings and
>> monitoring capabilities of Limits Management Hardware(LMh) associated with
>> cpu clusters. Also introduce support in cpufreq hardware driver to monitor
>> the interrupt associated with cpu frequency throttling so that this
>> information can be conveyed to the schdeuler via thermal pressure
>> interface.
>>
>> With this patch series following cpu performance improvement(30-70%) is
>> observed on sdm845. The reasoning here is that without LMh being programmed
>> properly from the kernel, the default settings were enabling thermal
>> mitigation for CPUs at too low a temperature (around 70-75 degree C).  This
>> in turn meant that many a time CPUs were never actually allowed to hit the
>> maximum possible/required frequencies.
>>
>> UnixBench whets and dhry (./Run whets dhry)
>> System Benchmarks Index Score
>>
>>                  Without LMh Support             With LMh Support
>> 1 copy test     1353.7                          1773.2
>>
>> 8 copy tests    4473.6                          7402.3
>>
>> Sysbench cpu
>> sysbench cpu --threads=8 --time=60 --cpu-max-prime=100000 run
>>
>>                  Without LMh Support             With LMh Support
>> Events per
>> second                  355                             614
>>
>> Avg Latency(ms)         21.84                           13.02
>>
>> v2->v3:
>> 	- Included patch adding dt binding documentation for LMh nodes.
>> 	- Rebased to v5.13
>>
>> Thara Gopinath (6):
>>    firmware: qcom_scm: Introduce SCM calls to access LMh
>>    thermal: qcom: Add support for LMh driver
>>    cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support
>>    arm64: boot: dts: qcom: sdm45: Add support for LMh node
>>    arm64: boot: dts: qcom: sdm845: Remove cpufreq cooling devices for CPU
>>      thermal zones
>>    dt-bindings: thermal: Add dt binding for QCOM LMh
>>
>>   .../devicetree/bindings/thermal/qcom-lmh.yaml | 100 ++++++++
>>   arch/arm64/boot/dts/qcom/sdm845.dtsi          | 162 ++----------
>>   drivers/cpufreq/qcom-cpufreq-hw.c             | 118 +++++++++
>>   drivers/firmware/qcom_scm.c                   |  58 +++++
>>   drivers/firmware/qcom_scm.h                   |   4 +
>>   drivers/thermal/qcom/Kconfig                  |  10 +
>>   drivers/thermal/qcom/Makefile                 |   1 +
>>   drivers/thermal/qcom/lmh.c                    | 239 ++++++++++++++++++
>>   include/linux/qcom_scm.h                      |  14 +
>>   9 files changed, 570 insertions(+), 136 deletions(-)
>>   create mode 100644 Documentation/devicetree/bindings/thermal/qcom-lmh.yaml
>>   create mode 100644 drivers/thermal/qcom/lmh.c
>>
> I've been using these patches on a 5.13 kernel
> (https://github.com/steev/linux/tree/linux-5.13.y - while trying to
> track down a different issue, while playing a video on youtube, as well
> as compressing a 9.2GB file with xz, I got the following

Hi Steev,

Thanks for testing this. I was unable to reproduce this. I have posted 
v4 moving the interrupt handling in qcom-cpufreq-hw to threaded 
interrupt handler and hopefully this should fix the issue. It will be 
great if you can test and let me know.

-- 
Warm Regards
Thara (She/Her/Hers)





  reply	other threads:[~2021-07-27 15:29 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-08 12:06 Thara Gopinath
2021-07-08 12:06 ` [Patch v3 1/6] firmware: qcom_scm: Introduce SCM calls to access LMh Thara Gopinath
2021-07-10  4:02   ` Bjorn Andersson
2021-07-08 12:06 ` [Patch v3 2/6] thermal: qcom: Add support for LMh driver Thara Gopinath
2021-07-10  4:15   ` Bjorn Andersson
2021-07-13  0:49     ` Thara Gopinath
2021-07-08 12:06 ` [Patch v3 3/6] cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support Thara Gopinath
2021-07-08 20:00   ` kernel test robot
2021-07-09  6:46   ` Viresh Kumar
2021-07-09 15:37     ` Thara Gopinath
2021-07-12  4:35       ` Viresh Kumar
2021-07-12  4:41       ` Viresh Kumar
2021-07-13  1:18         ` Thara Gopinath
2021-07-13  3:18           ` Viresh Kumar
2021-07-14 12:37             ` Thara Gopinath
2021-07-10  4:57   ` Bjorn Andersson
2021-07-13  1:09     ` Thara Gopinath
2021-07-08 12:06 ` [Patch v3 4/6] arm64: boot: dts: qcom: sdm45: Add support for LMh node Thara Gopinath
2021-07-10  4:17   ` Bjorn Andersson
2021-07-19 16:33   ` Bjorn Andersson
2021-07-19 22:44     ` Thara Gopinath
2021-07-08 12:06 ` [Patch v3 5/6] arm64: boot: dts: qcom: sdm845: Remove cpufreq cooling devices for CPU thermal zones Thara Gopinath
2021-07-10  4:17   ` Bjorn Andersson
2021-07-08 12:06 ` [Patch v3 6/6] dt-bindings: thermal: Add dt binding for QCOM LMh Thara Gopinath
2021-07-10  4:21   ` Bjorn Andersson
2021-07-13  0:54     ` Thara Gopinath
2021-07-12 17:32   ` Rob Herring
2021-07-22  3:14 ` [Patch v3 0/6] Introduce LMh driver for Qualcomm SoCs Steev Klimaszewski
2021-07-27 15:29   ` Thara Gopinath [this message]
2021-07-27 17:43     ` Steev Klimaszewski

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