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From:   Meng Li <li.meng@amd.com>
To:     Shuah Khan <skhan@linuxfoundation.org>,
        Huang Rui <ray.huang@amd.com>, <linux-pm@vger.kernel.org>
CC:     "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Nathan Fontenot <nathan.fontenot@amd.com>,
        Deepak Sharma <deepak.sharma@amd.com>,
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        Perry Yuan <Perry.Yuan@amd.com>,
        Xiaojian Du <Xiaojian.Du@amd.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Borislav Petkov <bp@alien8.de>, <linux-kernel@vger.kernel.org>,
        Meng Li <li.meng@amd.com>
Subject: [RESEND PATCH] cpufreq: amd-pstate: Add explanation for X86_AMD_PSTATE_UT
Date:   Thu, 8 Sep 2022 08:28:21 +0800
Message-ID: <20220908002821.1648880-2-li.meng@amd.com>
In-Reply-To: <20220908002821.1648880-1-li.meng@amd.com>
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This kernel module is used for testing. It's safe to say M here.
It can also be built-in without X86_AMD_PSTATE enabled.
Currently, only tests for amd-pstate are supported. If X86_AMD_PSTATE
is set disabled, it can tell the users test can only run on amd-pstate
driver, please set X86_AMD_PSTATE enabled.
In the future, comparison tests will be added. It can set amd-pstate
disabled and set acpi-cpufreq enabled to run test cases, then compare
the test results.

Suggested-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Meng Li <li.meng@amd.com>
---
 drivers/cpufreq/Kconfig.x86                         | 8 ++++++++
 tools/testing/selftests/amd-pstate/amd-pstate-ut.sh | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index fdd819069d72..310779b07daf 100644
--- a/drivers/cpufreq/Kconfig.x86
+++ b/drivers/cpufreq/Kconfig.x86
@@ -58,6 +58,14 @@ config X86_AMD_PSTATE_UT
 	help
 	  This kernel module is used for testing. It's safe to say M here.
 
+	  It can also be built-in without X86_AMD_PSTATE enabled.
+	  Currently, only tests for amd-pstate are supported. If X86_AMD_PSTATE
+	  is set disabled, it can tell the users test can only run on amd-pstate
+	  driver, please set X86_AMD_PSTATE enabled.
+	  In the future, comparison tests will be added. It can set amd-pstate
+	  disabled and set acpi-cpufreq enabled to run test cases, then compare
+	  the test results.
+
 config X86_ACPI_CPUFREQ
 	tristate "ACPI Processor P-States driver"
 	depends on ACPI_PROCESSOR
diff --git a/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh b/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh
index 273364650285..f8e82d91ffcf 100755
--- a/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh
+++ b/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh
@@ -32,6 +32,7 @@ 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 # Please set X86_AMD_PSTATE enabled."
 	echo "$0 # Current cpufreq scaling drvier is $scaling_driver."
 	exit $ksft_skip
 fi
-- 
2.34.1