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|
{ config, lib, pkgs, ... }:
with lib;
let
cpupower = config.boot.kernelPackages.cpupower;
cfg = config.powerManagement;
in
{
###### interface
options.powerManagement = {
# TODO: This should be aliased to powerManagement.cpufreq.governor.
# https://github.com/NixOS/nixpkgs/pull/53041#commitcomment-31825338
cpuFreqGovernor = mkOption {
type = types.nullOr types.str;
default = null;
example = "ondemand";
description = ''
Configure the governor used to regulate the frequence of the
available CPUs. By default, the kernel configures the
performance governor, although this may be overwritten in your
hardware-configuration.nix file.
Often used values: "ondemand", "powersave", "performance"
'';
};
cpufreq = {
max = mkOption {
type = types.nullOr types.ints.unsigned;
default = null;
example = 2200000;
description = ''
The maximum frequency the CPU will use. Defaults to the maximum possible.
'';
};
min = mkOption {
type = types.nullOr types.ints.unsigned;
default = null;
example = 800000;
description = ''
The minimum frequency the CPU will use.
'';
};
};
};
###### implementation
config =
let
governorEnable = cfg.cpuFreqGovernor != null;
maxEnable = cfg.cpufreq.max != null;
minEnable = cfg.cpufreq.min != null;
enable =
!config.boot.isContainer &&
(governorEnable || maxEnable || minEnable);
in
mkIf enable {
boot.kernelModules = optional governorEnable "cpufreq_${cfg.cpuFreqGovernor}";
environment.systemPackages = [ cpupower ];
systemd.services.cpufreq = {
description = "CPU Frequency Setup";
after = [ "systemd-modules-load.service" ];
wantedBy = [ "multi-user.target" ];
path = [ cpupower pkgs.kmod ];
unitConfig.ConditionVirtualization = false;
serviceConfig = {
Type = "oneshot";
RemainAfterExit = "yes";
ExecStart = "${cpupower}/bin/cpupower frequency-set " +
optionalString governorEnable "--governor ${cfg.cpuFreqGovernor} " +
optionalString maxEnable "--max ${toString cfg.cpufreq.max} " +
optionalString minEnable "--min ${toString cfg.cpufreq.min} ";
SuccessExitStatus = "0 237";
};
};
};
}
|