Feature Request: ACPI CPPC, AMD P-State and Intel P-State information

[emansom]

Description

Both the AMD and Intel specific pstate drivers expose some useful information via their /sys path interfaces
e.g. like hwp_dynamic_boost in Intel P-State driver and amd_pstate_prefcore_ranking in the AMD P-State driver

Additionally exposing the ACPI CPPC table in human readable format could be useful, to show in a single glance which processor core is the most performant

Resources

https://docs.kernel.org/admin-guide/pm/intel_pstate.html
https://docs.kernel.org/admin-guide/pm/amd-pstate.html
https://docs.kernel.org/admin-guide/acpi/cppc_sysfs.html

Proposed solution

Implement new sensors for ACPI CPPC, Intel P-State and AMD P-State in siomon

[wendelltron]

I am looking at adding in a bunch of stuff I did for the intel 13th/14th gen boost table calculations and patches I submitted to turbostat that weren't accepted. Some of that work would be adjacent to this functionality and some of these interfaces take kind of a long time to poll (at least, from what I was doing on turbostat). I think we can support this, though. It was