53 lines
1 KiB
Nix
53 lines
1 KiB
Nix
{ config, lib, ... }:
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with lib;
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let
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cfg = config.powerManagement.scsiLinkPolicy;
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kernel = config.boot.kernelPackages.kernel;
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allowedValues = [
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"min_power"
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"max_performance"
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"medium_power"
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"med_power_with_dipm"
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];
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in
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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 = null;
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type = types.nullOr (types.enum allowedValues);
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description = ''
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SCSI link power management policy. The kernel default is
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"max_performance".
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"med_power_with_dipm" is supported by kernel versions
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4.15 and newer.
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'';
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};
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};
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###### implementation
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config = mkIf (cfg != null) {
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assertions = singleton {
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assertion = (cfg == "med_power_with_dipm") -> versionAtLeast kernel.version "4.15";
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message = "med_power_with_dipm is not supported for kernels older than 4.15";
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};
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services.udev.extraRules = ''
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SUBSYSTEM=="scsi_host", ACTION=="add", KERNEL=="host*", ATTR{link_power_management_policy}="${cfg}"
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'';
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};
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}
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