linux-kernel - Re: [PATCH V6 3/4] selftests: amd-pstate: Add test trigger for amd-pstate driver

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Date:   Thu, 19 May 2022 13:50:38 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Meng Li <li.meng@....com>, Huang Rui <ray.huang@....com>,
        linux-pm@...r.kernel.org
Cc:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        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>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH V6 3/4] selftests: amd-pstate: Add test trigger for
 amd-pstate driver

On 5/19/22 7:47 AM, Meng Li wrote:
> Add amd-pstate test trigger in kselftest, it will load/unload
> amd-pstate-ut module to test some cases etc.
> 
> Signed-off-by: Meng Li <li.meng@....com>
> Acked-by: Huang Rui <ray.huang@....com>
> ---
>   tools/testing/selftests/Makefile              |  1 +
>   tools/testing/selftests/amd-pstate/Makefile   |  8 +++++
>   .../selftests/amd-pstate/amd-pstate-ut.sh     | 34 +++++++++++++++++++
>   tools/testing/selftests/amd-pstate/config     |  1 +
>   4 files changed, 44 insertions(+)
>   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
> 
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 2319ec87f53d..975c13368286 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -1,5 +1,6 @@
>   # SPDX-License-Identifier: GPL-2.0
>   TARGETS += alsa
> +TARGETS += amd-pstate
>   TARGETS += arm64
>   TARGETS += bpf
>   TARGETS += breakpoints
> diff --git a/tools/testing/selftests/amd-pstate/Makefile b/tools/testing/selftests/amd-pstate/Makefile
> new file mode 100644
> index 000000000000..e1432112fb70
> --- /dev/null
> +++ b/tools/testing/selftests/amd-pstate/Makefile
> @@ -0,0 +1,8 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +# Makefile for amd-pstate/ function selftests
> +
> +TEST_PROGS := amd-pstate-ut.sh
> +
> +include ../lib.mk
> +
> +$(TEST_GEN_FILES): $(HEADERS)

Do you still need this?

> diff --git a/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh b/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh
> new file mode 100755
> index 000000000000..970f7a76c7d5
> --- /dev/null
> +++ b/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh
> @@ -0,0 +1,34 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +
> +# amd-pstate-ut is a test module for testing the amd-pstate driver.
> +# (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 result together, it will benefit power and performance scale optimization.
> +
> +# Kselftest framework requirement - SKIP code is 4.
> +ksft_skip=4
> +
> +if ! uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ | grep -q x86; then

This can be simpler - see prctl/Makefile or other tests that do arch
checks. Also does this test run on non-amd x86_64 systems?

> +	echo "$0 # Skipped: Test can only run on x86 architectures."

All x86 or x86_64 AMD systems? Does this run on Intel systems?

> +	exit $ksft_skip
> +fi
> +
> +msg="Skip all tests:"
> +if [ ! -w /dev ]; then
> +    echo $msg please run this as root >&2
> +    exit $ksft_skip
> +fi
> +
> +scaling_driver=$(cat /sys/devices/system/cpu/cpufreq/policy0/scaling_driver)
> +
> +if [ "$scaling_driver" != "amd-pstate" ]; then
> +	echo "$0 # Skipped: Test can only run on amd-pstate driver."
> +	echo "$0 # Current cpufreq scaling drvier is $scaling_driver."
> +	exit $ksft_skip
> +fi
> +
> +$(dirname $0)/../kselftest/module.sh "amd-pstate-ut" amd-pstate-ut

What does this do?

Has this script been updated after moving the module to drivers/cpufreq?
Also doesn't this script need to to load the amd_pstate_ut module?

Please take a look at user/test_user_copy.sh for example on modprobe
checks and appropriate test exit codes

> diff --git a/tools/testing/selftests/amd-pstate/config b/tools/testing/selftests/amd-pstate/config
> new file mode 100644
> index 000000000000..f43103c9adc4
> --- /dev/null
> +++ b/tools/testing/selftests/amd-pstate/config
> @@ -0,0 +1 @@
> +CONFIG_X86_AMD_PSTATE_UT=m
> 

thanks,
-- Shuah