linux.git/tools/power/cpupower/utils/helpers/cppc.c, branch master Linux kernel source tree cpupower: Add generic CPPC performance display 2026-07-16T23:34:27+00:00 Jeremy Linton jeremy.linton@arm.com 2026-07-09T22:13:42+00:00 68f34fad760b68e878aced43934cc02b9d1bed89 Arm64 machines, and possibly others, use the standard ACPI defined CPPC infrastructure. cpupower has CPPC support, but it's largely written around the intricacies of AMD processors, using platform MSRs to avoid shortcomings in the specification. Add a generic CPPC display that depends only on standardized fields. The computed frequency values are best effort and rely on the FW providing optional values that can be used to derive a meaningful frequency at a given unique performance level. Link: https://lore.kernel.org/r/20260709221344.1919794-2-jeremy.linton@arm.com Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> 
Arm64 machines, and possibly others, use the standard ACPI defined CPPC
infrastructure. cpupower has CPPC support, but it's largely written
around the intricacies of AMD processors, using platform MSRs to avoid
shortcomings in the specification.

Add a generic CPPC display that depends only on standardized fields. The
computed frequency values are best effort and rely on the FW providing
optional values that can be used to derive a meaningful frequency at a
given unique performance level.

Link: https://lore.kernel.org/r/20260709221344.1919794-2-jeremy.linton@arm.com
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>