46 lines
910 B
Nix
46 lines
910 B
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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{
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###### interface
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options = {
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powerManagement.scsiLinkPolicy = mkOption {
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default = "";
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example = "min_power";
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type = types.str;
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description = ''
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Configure the SCSI link power management policy. By default,
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the kernel configures "max_performance".
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'';
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};
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};
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###### implementation
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config = mkIf (config.powerManagement.scsiLinkPolicy != "") {
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jobs."scsi-link-pm" =
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{ description = "SCSI Link Power Management Policy";
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startOn = "stopped udevtrigger";
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task = true;
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unitConfig.ConditionPathIsReadWrite = "/sys/class/scsi_host";
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script = ''
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shopt -s nullglob
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for x in /sys/class/scsi_host/host*/link_power_management_policy; do
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echo ${config.powerManagement.scsiLinkPolicy} > $x
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done
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'';
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};
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};
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}
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