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Date: Thu, 28 Apr 2022 17:14:37 +0800
From: Huang Rui <ray.huang@....com>
To: "Meng, Li (Jassmine)" <Li.Meng@....com>
Cc: Shuah Khan <skhan@...uxfoundation.org>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
"Fontenot, Nathan" <Nathan.Fontenot@....com>,
"Sharma, Deepak" <Deepak.Sharma@....com>,
"Deucher, Alexander" <Alexander.Deucher@....com>,
"Limonciello, Mario" <Mario.Limonciello@....com>,
"Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
"Yuan, Perry" <Perry.Yuan@....com>,
"Du, Xiaojian" <Xiaojian.Du@....com>,
Viresh Kumar <viresh.kumar@...aro.org>,
Borislav Petkov <bp@...en8.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4 3/3] Documentation: amd-pstate: Add unit test
introduction
On Wed, Apr 27, 2022 at 09:53:15PM +0800, Meng, Li (Jassmine) wrote:
> Introduce the AMD P-State unit test module design and implementation.
>
> Signed-off-by: Meng Li <li.meng@....com>
> ---
> Documentation/admin-guide/pm/amd-pstate.rst | 87 +++++++++++++++++++++
> 1 file changed, 87 insertions(+)
>
> diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
> index 83b58eb4ab4d..395b8b5c680c 100644
> --- a/Documentation/admin-guide/pm/amd-pstate.rst
> +++ b/Documentation/admin-guide/pm/amd-pstate.rst
> @@ -182,6 +182,7 @@ to the ``struct sugov_cpu`` that the utilization update belongs to.
> Then, ``amd-pstate`` updates the desired performance according to the CPU
> scheduler assigned.
>
> +.. _processor_support:
>
> Processor Support
> =======================
> @@ -282,6 +283,8 @@ efficiency frequency management method on AMD processors.
> Kernel Module Options for ``amd-pstate``
> =========================================
>
> +.. _shared_mem:
> +
> ``shared_mem``
> Use a module param (shared_mem) to enable related processors manually with
> **amd_pstate.shared_mem=1**.
> @@ -393,6 +396,87 @@ about part of the output. ::
> CPU_005 712 116384 39 49 166 0.7565 9645075 2214891 38431470 25.1 11.646 469 2.496 kworker/5:0-40
> CPU_006 712 116408 39 49 166 0.6769 8950227 1839034 37192089 24.06 11.272 470 2.496 kworker/6:0-1264
>
> +Unit Tests for amd-pstate
> +-------------------------
> +
> +``amd-pstate-ut`` is a test module for testing the ``amd-pstate`` driver.
> +
> + * It can help all users to verify their processor support (SBIOS/Firmware or Hardware).
> +
> + * Kernel can have a basic function test to avoid the kernel regression during the update.
> +
> + * We can introduce more functional or performance tests to align the result together, it will benefit power and performance scale optimization.
> +
> +1. Test case decriptions
> +
> + +---------+--------------------------------+------------------------------------------------------------------------------------+
> + | Index | Functions | Description |
> + +=========+================================+====================================================================================+
> + | 0 | aput_acpi_cpc || Check whether the _CPC object is present in SBIOS. |
> + | | || |
> + | | || The detail refer to `Processor Support <processor_support_>`_. |
> + +---------+--------------------------------+------------------------------------------------------------------------------------+
> + | 1 | aput_check_enabled || Check whether AMD P-State is enabled. |
> + | | || |
> + | | || AMD P-States and ACPI hardware P-States always can be supported in one processor. |
> + | | | But AMD P-States has the higher priority and if it is enabled with |
> + | | | :c:macro:`MSR_AMD_CPPC_ENABLE` or ``cppc_set_enable``, it will respond to the |
> + | | | request from AMD P-States. |
> + +---------+--------------------------------+------------------------------------------------------------------------------------+
> + | 2 | aput_check_perf || Check if the each performance values are reasonable. |
> + | | || highest_perf >= nominal_perf > lowest_nonlinear_perf > lowest_perf > 0. |
> + +---------+--------------------------------+------------------------------------------------------------------------------------+
> + | 3 | aput_check_freq || Check if the each frequency values and max freq when set support boost mode |
> + | | | are reasonable. |
> + | | || max_freq >= nominal_freq > lowest_nonlinear_freq > min_freq > 0 |
> + | | || If boost is not active but supported, this maximum frequency will be larger than |
> + | | | the one in ``cpuinfo``. |
> + +---------+--------------------------------+------------------------------------------------------------------------------------+
> +
> +#. How to execute the tests
> +
> + We use test module in the kselftest frameworks to implement it.
> + We create amd-pstate-ut module and tie it into kselftest.(for
> + details refer to Linux Kernel Selftests [4]_).
> +
> + 1. Build ::
> +
> + jasminemeng@...mine-meng:~/amd-brahma$ cd linux
> + jasminemeng@...mine-meng:~/amd-brahma/linux$ make modules M=tools/testing/selftests/amd-pstate/amd-pstate-ut
> + CC [M] tools/testing/selftests/amd-pstate/amd-pstate-ut/amd-pstate-ut.o
> + MODPOST tools/testing/selftests/amd-pstate/amd-pstate-ut/Module.symvers
> + CC [M] tools/testing/selftests/amd-pstate/amd-pstate-ut/amd-pstate-ut.mod.o
> + LD [M] tools/testing/selftests/amd-pstate/amd-pstate-ut/amd-pstate-ut.ko
> + BTF [M] tools/testing/selftests/amd-pstate/amd-pstate-ut/amd-pstate-ut.ko
> + jasminemeng@...mine-meng:~/amd-brahma/linux$ make -C tools/testing/selftests
> +
> + #. Installation & Steps ::
> +
> + jasmine@...mine-MayanDAP-RMB:~/amd-brahma/linux$ make -C tools/testing/selftests install INSTALL_PATH=~/kselftest
> + jasmine@...mine-MayanDAP-RMB:~$ sudo cp amd-pstate-ut.ko /lib/modules/5.18.0-rc2+/
We should not mention a specfic kernel version "5.18.0-rc2+" here.
> + jasmine@...mine-MayanDAP-RMB:~$ sudo depmod
> + jasmine@...mine-MayanDAP-RMB:~$ sudo ./kselftest/run_kselftest.sh -c amd-pstate
"Can we move "insmod/rmmod amd-pstate-ut.ko" stuff into script amd_pstate_ut.sh?
Thanks,
Ray
> + TAP version 13
> + 1..1
> + # selftests: amd-pstate: amd-pstate-ut.sh
> + # amd-pstate-ut: ok
> + ok 1 selftests: amd-pstate: amd-pstate-ut.sh
> +
> + #. Results ::
> +
> + jasmine@...mine-MayanDAP-RMB:~$ dmesg | grep "amd-pstate-ut" | tee log.txt
> + [76697.480217] amd-pstate-ut: loaded.
> + [76697.480222] amd-pstate-ut: ****** Begin 1 acpi_cpc_valid ******
> + [76697.480227] amd-pstate-ut: ****** End 1 acpi_cpc_valid ******
> + [76697.480228] amd-pstate-ut: ****** Begin 2 check_enabled ******
> + [76697.480253] amd-pstate-ut: ****** End 2 check_enabled ******
> + [76697.480255] amd-pstate-ut: ****** Begin 3 check_perf ******
> + [76697.480554] amd-pstate-ut: ****** End 3 check_perf ******
> + [76697.480556] amd-pstate-ut: ****** Begin 4 check_freq ******
> + [76697.480558] amd-pstate-ut: ****** End 4 check_freq ******
> + [76697.480559] amd-pstate-ut: all 4 tests passed
> + [76697.482507] amd-pstate-ut: unloaded.
> +
>
> Reference
> ===========
> @@ -405,3 +489,6 @@ Reference
>
> .. [3] Processor Programming Reference (PPR) for AMD Family 19h Model 51h, Revision A1 Processors
> https://www.amd.com/system/files/TechDocs/56569-A1-PUB.zip
> +
> +.. [4] Linux Kernel Selftests,
> + https://www.kernel.org/doc/html/latest/dev-tools/kselftest.html
> --
> 2.25.1
>
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