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Merge pull request #10610 from joachifm/scsi-link-pm

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nixos: set scsi link power policy using udev
This commit is contained in:
Domen Kožar 2015-11-16 13:21:36 +01:00
commit 0567714b99
1 changed files with 10 additions and 24 deletions
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34
nixos/modules/tasks/scsi-link-power-management.nix
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@ -2,18 +2,19 @@
with lib; with lib;
let cfg = config.powerManagement.scsiLinkPolicy; in
{ {
###### interface ###### interface
options = { options = {
powerManagement.scsiLinkPolicy = mkOption { powerManagement.scsiLinkPolicy = mkOption {
default = ""; default = null;
example = "min_power"; type = types.nullOr (types.enum [ "min_power" "max_performance" "medium_power" ]);
type = types.str;
description = '' description = ''
Configure the SCSI link power management policy. By default, SCSI link power management policy. The kernel default is
the kernel configures "max_performance". "max_performance".
''; '';
}; };
@ -22,25 +23,10 @@ with lib;
###### implementation ###### implementation
config = mkIf (config.powerManagement.scsiLinkPolicy != "") { config = mkIf (cfg != null) {
services.udev.extraRules = ''
jobs."scsi-link-pm" = SUBSYSTEM=="scsi_host", ACTION=="add", KERNEL=="host*", ATTR{link_power_management_policy}="${cfg}"
{ description = "SCSI Link Power Management Policy"; '';
startOn = "stopped udevtrigger";
task = true;
unitConfig.ConditionPathIsReadWrite = "/sys/class/scsi_host";
script = ''
shopt -s nullglob
for x in /sys/class/scsi_host/host*/link_power_management_policy; do
echo ${config.powerManagement.scsiLinkPolicy} > $x
done
'';
};
}; };
} }