forked from Minki/linux
Documentation: amd-pstate: Add unit test introduction
Introduce the AMD P-State unit test module design and implementation. It also talks about kselftest and how to use. Signed-off-by: Meng Li <li.meng@amd.com> Acked-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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Meng Li
Shuah Khan
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e1083a03c5
commit
7fe3629729
@ -182,6 +182,7 @@ to the ``struct sugov_cpu`` that the utilization update belongs to.
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Then, ``amd-pstate`` updates the desired performance according to the CPU
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scheduler assigned.
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.. _processor_support:
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Processor Support
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=======================
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@ -282,6 +283,8 @@ efficiency frequency management method on AMD processors.
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Kernel Module Options for ``amd-pstate``
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=========================================
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.. _shared_mem:
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``shared_mem``
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Use a module param (shared_mem) to enable related processors manually with
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**amd_pstate.shared_mem=1**.
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@ -393,6 +396,76 @@ about part of the output. ::
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CPU_005 712 116384 39 49 166 0.7565 9645075 2214891 38431470 25.1 11.646 469 2.496 kworker/5:0-40
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CPU_006 712 116408 39 49 166 0.6769 8950227 1839034 37192089 24.06 11.272 470 2.496 kworker/6:0-1264
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Unit Tests for amd-pstate
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-------------------------
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``amd-pstate-ut`` is a test module for testing the ``amd-pstate`` driver.
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* It can help all users to verify their processor support (SBIOS/Firmware or Hardware).
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* Kernel can have a basic function test to avoid the kernel regression during the update.
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* We can introduce more functional or performance tests to align the result together, it will benefit power and performance scale optimization.
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1. Test case decriptions
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+---------+--------------------------------+------------------------------------------------------------------------------------+
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| Index | Functions | Description |
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+=========+================================+====================================================================================+
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| 0 | amd_pstate_ut_acpi_cpc_valid || Check whether the _CPC object is present in SBIOS. |
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| | || |
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| | || The detail refer to `Processor Support <processor_support_>`_. |
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+---------+--------------------------------+------------------------------------------------------------------------------------+
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| 1 | amd_pstate_ut_check_enabled || Check whether AMD P-State is enabled. |
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| | || |
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| | || AMD P-States and ACPI hardware P-States always can be supported in one processor. |
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| | | But AMD P-States has the higher priority and if it is enabled with |
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| | | :c:macro:`MSR_AMD_CPPC_ENABLE` or ``cppc_set_enable``, it will respond to the |
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| | | request from AMD P-States. |
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+---------+--------------------------------+------------------------------------------------------------------------------------+
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| 2 | amd_pstate_ut_check_perf || Check if the each performance values are reasonable. |
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| | || highest_perf >= nominal_perf > lowest_nonlinear_perf > lowest_perf > 0. |
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+---------+--------------------------------+------------------------------------------------------------------------------------+
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| 3 | amd_pstate_ut_check_freq || Check if the each frequency values and max freq when set support boost mode |
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| | | are reasonable. |
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| | || max_freq >= nominal_freq > lowest_nonlinear_freq > min_freq > 0 |
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| | || If boost is not active but supported, this maximum frequency will be larger than |
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| | | the one in ``cpuinfo``. |
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+---------+--------------------------------+------------------------------------------------------------------------------------+
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#. How to execute the tests
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We use test module in the kselftest frameworks to implement it.
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We create amd-pstate-ut module and tie it into kselftest.(for
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details refer to Linux Kernel Selftests [4]_).
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1. Build
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+ open the :c:macro:`CONFIG_X86_AMD_PSTATE` configuration option.
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+ set the :c:macro:`CONFIG_X86_AMD_PSTATE_UT` configuration option to M.
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+ make project
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+ make selftest ::
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$ cd linux
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$ make -C tools/testing/selftests
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#. Installation & Steps ::
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$ make -C tools/testing/selftests install INSTALL_PATH=~/kselftest
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$ sudo ./kselftest/run_kselftest.sh -c amd-pstate
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TAP version 13
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1..1
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# selftests: amd-pstate: amd-pstate-ut.sh
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# amd-pstate-ut: ok
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ok 1 selftests: amd-pstate: amd-pstate-ut.sh
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#. Results ::
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$ dmesg | grep "amd_pstate_ut" | tee log.txt
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[12977.570663] amd_pstate_ut: 1 amd_pstate_ut_acpi_cpc_valid success!
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[12977.570673] amd_pstate_ut: 2 amd_pstate_ut_check_enabled success!
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[12977.571207] amd_pstate_ut: 3 amd_pstate_ut_check_perf success!
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[12977.571212] amd_pstate_ut: 4 amd_pstate_ut_check_freq success!
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Reference
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===========
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@ -405,3 +478,6 @@ Reference
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.. [3] Processor Programming Reference (PPR) for AMD Family 19h Model 51h, Revision A1 Processors
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https://www.amd.com/system/files/TechDocs/56569-A1-PUB.zip
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.. [4] Linux Kernel Selftests,
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https://www.kernel.org/doc/html/latest/dev-tools/kselftest.html
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