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