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211 lines
4.3 KiB
211 lines
4.3 KiB
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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idle.c
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Abstract:
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This module implements the power management idle timing code for
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device objects
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Author:
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Ken Reneris (kenr) 19-July-1994
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Revision History:
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--*/
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#include "pop.h"
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VOID
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PoSetDeviceIdleDetection (
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IN PDEVICE_OBJECT DeviceObject,
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IN ULONG IdleTime
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)
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/*++
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Routine Description:
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Signifies that the device object in question is a DirectIoDevice and
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that the Power Manager should automatically send the device object
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SetPower IRPs to power off after the specified idle period.
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Arguments:
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DeviceObject - Device object which wants timed power downs.
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IdleTime - Approximate time the device object needs to be idle
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before powering it down.
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--*/
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{
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PDEVOBJ_EXTENSION DeviceObjectExt;
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KIRQL OldIrql;
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LONGLONG li;
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ULONG IdlePasses;
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BOOLEAN EmptyList;
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#ifdef _PNP_POWER_
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EmptyList = FALSE;
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DeviceObjectExt = (PDEVOBJ_EXTENSION) DeviceObject->DeviceObjectExtension;
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//
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// Compute idle passes
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//
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li = IdleTime / PopIdleScanTimeInSeconds;
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IdlePasses = ((ULONG) li) + 1;
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if (IdlePasses < li) {
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IdlePasses = 999;
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}
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if (IdlePasses < 2) {
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IdlePasses = 2;
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}
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PopLockStateDatabase (&OldIrql);
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//
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// If device is already in the idletime queue, remove it
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//
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if (DeviceObjectExt->IdleList.Flink) {
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RemoveEntryList (&DeviceObjectExt->IdleList);
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DeviceObjectExt->IdleList.Flink = NULL;
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}
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if (IdleTime == 0) {
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//
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// If IdleTime is 0, stop any idle detection for this device
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//
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DeviceObjectExt->MaxIdleCount = 0;
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} else {
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//
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// Put DeviceObject into active device list
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//
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EmptyList = IsListEmpty (&PopActiveIdleScanQueue);
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InsertTailList (&PopActiveIdleScanQueue, &DeviceObjectExt->IdleList);
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//
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// Set # of passes the device must be idle before gettings powered down.
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//
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DeviceObjectExt->MaxIdleCount = IdlePasses;
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}
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PoSetDeviceBusy (DeviceObject);
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//
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// Unlock Power Manager Database
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//
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PopUnlockStateDatabase (OldIrql);
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//
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// If previous state of ActiveIdleScanQueue was empty, then
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// queue the IdleScan timer
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//
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if (EmptyList) {
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KeSetTimer (&PopIdleScanTimer, PopIdleScanTime, &PopIdleScanDpc);
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}
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#endif
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}
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#ifdef _PNP_POWER_
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VOID
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PopScanForIdleDevices (
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IN PKDPC Dpc,
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IN PVOID DeferredContext,
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IN PVOID SystemArgument1,
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IN PVOID SystemArgument2
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)
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{
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KIRQL OldIrql;
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PLIST_ENTRY Link, NextLink;
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BOOLEAN EmptyList;
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PDEVOBJ_EXTENSION DeviceObjectExt;
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//
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// Lock Power Manager Database
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//
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PopLockStateDatabase (&OldIrql);
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//
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// Scan active device objects & power down any idle object
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//
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Link = PopActiveIdleScanQueue.Flink;
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while (Link != &PopActiveIdleScanQueue) {
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NextLink = Link->Flink;
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DeviceObjectExt = CONTAINING_RECORD(Link, DEVOBJ_EXTENSION, IdleList);
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//
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// If device is in the powered down state, remove it from the
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// active scan list
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//
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if (DeviceObjectExt->CurrentPowerState > PowerQuery) {
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RemoveEntryList (Link);
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Link->Flink = NULL;
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} else {
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//
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// Add one to the device objects IdleCount, if the device has
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// been idle for too long then request a SetPower down IRP for
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// the device
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//
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DeviceObjectExt->IdleCount += 1;
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if (DeviceObjectExt->IdleCount >= DeviceObjectExt->MaxIdleCount) {
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// bugbug: flush cache!!!
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PopRequestPowerChange (DeviceObjectExt, PowerDown, PowerUnspecified);
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}
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}
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//
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// Check next device object
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//
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Link = NextLink;
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}
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EmptyList = IsListEmpty (&PopActiveIdleScanQueue);
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//
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// Unlock Power Manager Database
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//
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PopUnlockStateDatabase (OldIrql);
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//
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// If IdleScanQueue not empty, requeue idle scan timer
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//
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if (!EmptyList && PoEnabled) {
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KeSetTimer (&PopIdleScanTimer, PopIdleScanTime, &PopIdleScanDpc);
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}
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}
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#endif // _PNP_POWER_
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