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cpupower: Don't try to read frequency from hardware when kernel uses aperfmperf

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When the amd-pstate is in use frequency is set by the hardware and
measured by the kernel through using the aperf and mperf registers.

There is no direct call to the hardware to indicate current frequency.

Detect that this feature is in use and skip the check.

Link: https://lore.kernel.org/r/20241218191144.3440854-5-superm1@kernel.org
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Mario Limonciello 2024-12-18 13:09:53 -06:00 committed by Shuah Khan
parent 6d4a2987f9
commit 26e16174f5
1 changed files with 6 additions and 1 deletions
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7
tools/power/cpupower/utils/cpufreq-info.c
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@ -254,7 +254,12 @@ static int get_freq_kernel(unsigned int cpu, unsigned int human)
static int get_freq_hardware(unsigned int cpu, unsigned int human)
{
unsigned long freq = cpufreq_get_freq_hardware(cpu);
unsigned long freq;
if (cpupower_cpu_info.caps & CPUPOWER_CAP_APERF)
return -EINVAL;
freq = cpufreq_get_freq_hardware(cpu);
printf(_(" current CPU frequency: "));
if (!freq) {
printf("Unable to call hardware\n");