/sys/devices/system/cpu/cpufreq/policy0/amd_pstate_hw_prefcore
/sys/devices/system/cpu/cpufreq/policy0/amd_pstate_lowest_nonlinear_freq
/sys/devices/system/cpu/cpufreq/policy0/amd_pstate_max_freq
+ /sys/devices/system/cpu/cpufreq/policy0/amd_pstate_prefcore_ranking
``amd_pstate_highest_perf / amd_pstate_max_freq``
The performance ranking of the core. This number doesn't have any unit, but
larger numbers are preferred at the time of reading. This can change at
-runtime based on platform conditions. This attribute is read-only.
+runtime based on platform conditions. This attribute is read-only. This file
+is only visible on platforms which support the preferred core feature.
``energy_performance_available_preferences``