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198 lines
4.1 KiB
198 lines
4.1 KiB
/*++
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Copyright (c) 1996-2000 Microsoft Corporation
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Module Name:
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dispatch.c
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Abstract:
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This module contains dispatch code for PCI.SYS.
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Author:
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Ken Reneris (kenr) 4-Dec-1997
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Revision History:
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--*/
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#include "pcip.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, PciLocalDeviceUsage)
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#pragma alloc_text(PAGE, PciPdoDeviceUsage)
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#endif
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NTSTATUS
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PciLocalDeviceUsage (
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IN PPCI_POWER_STATE PowerState,
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IN PIRP Irp
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)
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{
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PIO_STACK_LOCATION irpSp;
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PLONG Addend;
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LONG Increment;
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LONG Junk;
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PAGED_CODE();
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irpSp = IoGetCurrentIrpStackLocation(Irp);
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Increment = irpSp->Parameters.UsageNotification.InPath ? 1 : -1;
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switch (irpSp->Parameters.UsageNotification.Type) {
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case DeviceUsageTypePaging: Addend = &PowerState->Paging; break;
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case DeviceUsageTypeHibernation: Addend = &PowerState->Hibernate; break;
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case DeviceUsageTypeDumpFile: Addend = &PowerState->CrashDump; break;
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default:
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return STATUS_NOT_SUPPORTED;
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}
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Junk = InterlockedExchangeAdd (Addend, Increment);
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#if DBG
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if (Increment == -1) {
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ASSERT(Junk > 0);
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}
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#endif
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return STATUS_SUCCESS;
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}
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NTSTATUS
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PciPdoDeviceUsage (
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IN PPCI_PDO_EXTENSION pdoExtension,
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IN PIRP Irp
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)
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{
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PDEVICE_OBJECT ParentFdo;
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PIO_STACK_LOCATION IrpSp;
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PIO_STACK_LOCATION NewIrpSp;
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PIRP NewIrp;
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KEVENT Event;
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NTSTATUS Status = STATUS_SUCCESS;
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IO_STATUS_BLOCK LocalIoStatus;
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PAGED_CODE();
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//
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// Do we have a parent that we must notify?
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//
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if (pdoExtension->ParentFdoExtension != NULL &&
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pdoExtension->ParentFdoExtension->PhysicalDeviceObject != NULL) {
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//
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// Get a referenced object to the parent
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//
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ParentFdo = IoGetAttachedDeviceReference(
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pdoExtension->ParentFdoExtension->PhysicalDeviceObject
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);
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if (ParentFdo == NULL) {
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Status = STATUS_NO_SUCH_DEVICE;
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goto PciPdoDeviceUsageExit;
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}
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//
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// Initialize the event to wait on
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//
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KeInitializeEvent( &Event, SynchronizationEvent, FALSE );
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//
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// Build an Irp
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//
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NewIrp = IoBuildSynchronousFsdRequest(
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IRP_MJ_PNP,
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ParentFdo,
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NULL,
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0,
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NULL,
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&Event,
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&LocalIoStatus
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);
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if (NewIrp == NULL) {
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Status = STATUS_INSUFFICIENT_RESOURCES;
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ObDereferenceObject( ParentFdo );
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goto PciPdoDeviceUsageExit;
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}
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//
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// Get the top of the stacks
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//
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NewIrpSp = IoGetNextIrpStackLocation( NewIrp );
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IrpSp = IoGetCurrentIrpStackLocation(Irp);
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//
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// Set the top of stack
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//
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*NewIrpSp = *IrpSp;
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//
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// Clear any completion routines from the new stack
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//
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IoSetCompletionRoutine(
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NewIrp,
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NULL,
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NULL,
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FALSE,
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FALSE,
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FALSE
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);
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NewIrp->IoStatus.Status = STATUS_NOT_SUPPORTED;
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//
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// Send the request down
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//
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Status = IoCallDriver( ParentFdo, NewIrp );
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if (Status == STATUS_PENDING) {
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//
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// Wait for the request to be done
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//
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KeWaitForSingleObject(
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&Event,
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Executive,
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KernelMode,
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FALSE,
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NULL
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);
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Status = LocalIoStatus.Status;
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}
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//
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// Deference the target
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//
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ObDereferenceObject( ParentFdo );
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}
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PciPdoDeviceUsageExit:
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//
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// If we succeeded, then apply the usages locally
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//
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if (NT_SUCCESS(Status)) {
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//
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// Apply the usage locally
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//
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Status = PciLocalDeviceUsage(&pdoExtension->PowerState, Irp);
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}
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//
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// Done
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//
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return Status;
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}
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