Message-ID: <c5b18849-1856-e0f0-4112-fdbd0b436bef@linuxfoundation.org>
Date:   Wed, 24 Aug 2022 15:58:19 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Meng Li <li.meng@....com>, Huang Rui <ray.huang@....com>,
        linux-pm@...r.kernel.org,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Nathan Fontenot <nathan.fontenot@....com>,
        Deepak Sharma <deepak.sharma@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Jinzhou Su <Jinzhou.Su@....com>,
        Perry Yuan <Perry.Yuan@....com>,
        Xiaojian Du <Xiaojian.Du@....com>,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [RESEND PATCH 0/4] Add unit test module for AMD P-State driver

On 8/16/22 9:46 PM, Meng Li wrote:
> Hi all:
> 
> According to shuah's review comments, update the patches based on
> https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/log/?h=next
> 
> AMD P-State unit test(amd-pstate-ut) is a kernel module for testing the
> functions of amd-pstate driver.
> It could import as a module to launch some test tasks.
> 1) It can help all users to verify their processor support (SBIOS/
> Firmware or Hardware).
> 2) Kernel can have a basic function test to avoid the kernel regression
> during the update.
> 3) We can introduce more functional or performance tests to align the
> together, it will benefit power and performance scale optimization.
> 
> We upstream out AMD P-state driver into Linux kernel and use this unit
> test module to verify the required conditions and basic functions of
> amd-pstate before integration test.
> 
> We use test module in the kselftest frameworks to implement it.
> We create amd-pstate-ut module and tie it into kselftest.
> 
> For example: The test case aput_acpi_cpc is used to check whether the
> _CPC object is exist in SBIOS.
> The amd-pstate initialization will fail if the _CPC in ACPI SBIOS is not
> existed at the detected processor, so it is a necessary condition.
> 
> At present, it only implements the basic framework and some simple test
> cases.
> 
> TODO : 1) we will add more test cases to improve the depth and coverage
> of the test. E.X. use the script to trigger the tbench, gitsource,
> kernbench, netperf, speedometer, and etc. testing and monitor the cpu
> frequency and performance goals change, power consumption at runtime.
> 
> Please check the documentation amd-pstate.rst for details of the test
> steps.
> 
> See patch series in below git repo:
> V1: https://lore.kernel.org/linux-pm/20220323071502.2674156-1-li.meng@amd.com/
> V2: https://lore.kernel.org/lkml/20220413090510.4039589-1-li.meng@amd.com/
> V3: https://lore.kernel.org/lkml/20220421074152.599419-1-li.meng@amd.com/
> V4: https://lore.kernel.org/lkml/20220427135315.3447550-1-li.meng@amd.com/
> V5: https://lore.kernel.org/lkml/20220505022913.329259-1-li.meng@amd.com/
> V6: https://lore.kernel.org/lkml/20220519134737.359290-1-li.meng@amd.com/
> V7: https://lore.kernel.org/lkml/20220522115423.1147282-1-li.meng@amd.com/
> 
> Changes from V1 -> V2:
> - cpufreq: amd-pstate:
> - - add a trailing of amd-pstate.h to MAINTAINER AMD PSTATE DRIVER.
> - selftests: cpufreq:
> - - add a wrapper shell script for the amd_pstate_testmod module.
> - selftests: cpufreq:
> - - remove amd_pstate_testmod kernel module to
>    .../cpufreq/amd_pstate_testmod.
> - Documentation: amd-pstate:
> - - amd_pstate_testmod rst document is not provided at present.
> 
> Changes from V2 -> V3:
> - cpufreq: amd-pstate:
> - - adjust the order of add amd-pstate.h in MAINTAINERS.
> - selftests: cpufreq:
> - - remove the call of amd_pstate_testmod.sh from cpufreq Makefile to
>    main.sh.
> - selftests: cpufreq:
> - - add explain the goal or intention of the AMD P-State Unit Test
>    module.
> - - modify comments.
> - - use the checkpatch.pl to check my patches.
> - - add conditions judgment before formal test.
> - - delete some unnecessary test cases.
> - - modify test cases about perf and performance etc.
> 
> Changes from V3 -> V4:
> - selftests: amd-pstate:
> - - remove script and test module to tools/testing/selftests/amd-pstate/
> - - uniformly named amd-pstate-ut.
> - - check current architectures and cpufreq driver in amd-pstate-ut.sh
> - - delete codes about conditions in amd-pstate-ut.c
> - Documentation: amd-pstate:
> - - add introduce document about amd-pstate unit test.
> 
> Changes from V4 -> V5:
> - selftests: amd-pstate:
> - - add print the current scaling_driver.
> - - add amd-pstate-ut.ko into TEST_GEN_FILES.
> - - move "insmod/rmmod amd-pstate-ut.ko" stuff into script
>    amd_pstate_ut.sh
> - - add a check of read back from X86_FEATURE_CPPC in get_shared_mem().
> - Documentation: amd-pstate:
> - - delete the test step about insmod/rmmod amd-pstate-ut.ko
> 
> Changes from V5 -> V6:
> - cpufreq: amd-pstate:
> - - add amd-pstate-ut test codes to drivers/cpurfreq
> - - add the macro CONFIG_X86_AMD_PSTATE_UT
> - selftests: amd-pstate:
> - - delete amd-pstate-ut test codes from
>    tools/testing/selftests/amd-pstate/
> 
> Changes from V6 -> V7:
> - cpufreq: amd-pstate:
> - - modify X86_AMD_PSTATE_UT dependencies and default value.
> - - modify a brief description of the amd-pstate-ut module.
> - - remove kselftest_module.h header include.
> - - modify shortform for AMD P-State unit test.
> - - add prefix for the names of test cases.
> - - in the file operation log, add the file path.
> - - add comments about the test cases.
> - - correct syntax errors.
> - selftests: amd-pstate:
> - - delete TEST_GEN_FILES$(TEST_GEN_FILES): $(HEADERS) form amd-pstate
>    Makefile.
> - - simplify the judgment about ARCH.
> - - add the judgment about cpu vendor.
> - - modify the method about load the amd-pstate-ut module.
> - Documentation: amd-pstate:
> - - update the name of the test function.
> - - update kernel log about test result.
> 
> Changes from V7 -> V8:
> - cpufreq: amd-pstate:
> - - amend commit message.
> - - amend module description.
> - Documentation: amd-pstate:
> - - amend commit message.
> - - Remove the personal data.
> 
> Thanks,
> Jasmine
> 
> Meng Li (4):
>    cpufreq: amd-pstate: Expose struct amd_cpudata
>    cpufreq: amd-pstate: Add test module for amd-pstate driver
>    selftests: amd-pstate: Add test trigger for amd-pstate driver
>    Documentation: amd-pstate: Add unit test introduction
> 
>   Documentation/admin-guide/pm/amd-pstate.rst   |  76 +++++
>   MAINTAINERS                                   |   1 +
>   drivers/cpufreq/Kconfig.x86                   |   7 +
>   drivers/cpufreq/Makefile                      |   1 +
>   drivers/cpufreq/amd-pstate-ut.c               | 293 ++++++++++++++++++
>   drivers/cpufreq/amd-pstate.c                  |  60 +---
>   include/linux/amd-pstate.h                    |  77 +++++
>   tools/testing/selftests/Makefile              |   1 +
>   tools/testing/selftests/amd-pstate/Makefile   |   9 +
>   .../selftests/amd-pstate/amd-pstate-ut.sh     |  55 ++++
>   tools/testing/selftests/amd-pstate/config     |   1 +
>   11 files changed, 522 insertions(+), 59 deletions(-)
>   create mode 100644 drivers/cpufreq/amd-pstate-ut.c
>   create mode 100644 include/linux/amd-pstate.h
>   create mode 100644 tools/testing/selftests/amd-pstate/Makefile
>   create mode 100755 tools/testing/selftests/amd-pstate/amd-pstate-ut.sh
>   create mode 100644 tools/testing/selftests/amd-pstate/config
> 

Rafael, Viresh,

I plan to apply these patches to linux-kselftest next for Linux 6.1
Please let me know if you have any objections.

thanks,
-- Shuah

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