cpufreq: amd-pstate: Add explanation for X86_AMD_PSTATE_UT

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>
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index fdd819069d723b2428c6e38cd216bcaa0a36a7b0..310779b07daf131015db699d1db232684d25b7f8 100644 (file)
--- 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 273364650285634eed38e75f348fd652eb13da39..f8e82d91ffcf80fed1f638cc237f20debd8545ba 100755 (executable)
--- 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