CVS commit: src/sys/dev/acpi

["Jared D. McNeill" <jmcneill%netbsd.org@localhost>]

Module Name:    src
Committed By:   jmcneill
Date:           Sun Dec 13 20:39:20 UTC 2020

Modified Files:
        src/sys/dev/acpi: files.acpi
Added Files:
        src/sys/dev/acpi: acpi_cppc.c

Log Message:
acpi: Add support for Collaborative Processor Performance Control (CPPC).

CPPC is the modern replacement for processor performance controls (P-states
and T-states). The _CPC method on a processor device contains information
about supported performance levels of the device.

This driver reports the supported performance levels and allows for
setting the desired level using the machdep.cpufreq.cpuN.* sysctls. Note
that a "performance level" value is not guaranteed to represent a CPU
frequency, so treat the numbers reported as such.


To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/sys/dev/acpi/acpi_cppc.c
cvs rdiff -u -r1.118 -r1.119 src/sys/dev/acpi/files.acpi

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.