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602 lines
20 KiB
602 lines
20 KiB
/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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pnp.c
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Abstract: NULL filter driver -- boilerplate code
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Author:
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ervinp
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Environment:
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Kernel mode
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Revision History:
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--*/
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#include <WDM.H>
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#include "filter.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, VA_PnP)
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#pragma alloc_text(PAGE, GetDeviceCapabilities)
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#ifdef HANDLE_DEVICE_USAGE
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#pragma alloc_text(PAGE, VA_DeviceUsageNotification)
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#endif // HANDLE_DEVICE_USAGE
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#endif
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NTSTATUS VA_PnP(struct DEVICE_EXTENSION *devExt, PIRP irp)
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/*++
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Routine Description:
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Dispatch routine for PnP IRPs (MajorFunction == IRP_MJ_PNP)
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Arguments:
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devExt - device extension for the targetted device object
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irp - IO Request Packet
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Return Value:
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NT status code
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--*/
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{
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PIO_STACK_LOCATION irpSp;
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NTSTATUS status = STATUS_SUCCESS;
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BOOLEAN completeIrpHere = FALSE;
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BOOLEAN justReturnStatus = FALSE;
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PAGED_CODE();
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irpSp = IoGetCurrentIrpStackLocation(irp);
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TRACE(TL_PNP_TRACE,("VA_PnP, minorFunc = %d \n", (ULONG)irpSp->MinorFunction));
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switch (irpSp->MinorFunction){
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case IRP_MN_START_DEVICE:
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TRACE(TL_PNP_WARNING,("START_DEVICE\n"));
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devExt->state = STATE_STARTING;
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/*
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* First, send the START_DEVICE irp down the stack
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* synchronously to start the lower stack.
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* We cannot do anything with our device object
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* before propagating the START_DEVICE this way.
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*/
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IoCopyCurrentIrpStackLocationToNext(irp);
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status = CallNextDriverSync(devExt, irp);
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if (NT_SUCCESS(status)){
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/*
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* Now that the lower stack is started,
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* do any initialization required by this device object.
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*/
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status = GetDeviceCapabilities(devExt);
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if (NT_SUCCESS(status)){
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devExt->state = STATE_STARTED;
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}
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else {
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devExt->state = STATE_START_FAILED;
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}
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}
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else {
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devExt->state = STATE_START_FAILED;
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}
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completeIrpHere = TRUE;
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break;
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case IRP_MN_QUERY_STOP_DEVICE:
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case IRP_MN_QUERY_REMOVE_DEVICE:
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TRACE(TL_PNP_WARNING,("QUERY_STOP_DEVICE (%d)or QUERY_REMOVE_DEVICE(%d)\n", IRP_MN_QUERY_STOP_DEVICE, IRP_MN_QUERY_REMOVE_DEVICE));
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#ifdef HANDLE_DEVICE_USAGE
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//
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// Need to fail these IRPs if a paging, hibernation, or crashdump
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// file is currently open on this device
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//
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if( devExt->pagingFileCount != 0
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|| devExt->hibernationFileCount != 0
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|| devExt->crashdumpFileCount != 0 )
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{
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// Fail the IRP
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TRACE(TL_PNP_WARNING,("Failing QUERY_(STOP,REMOVE)_DEVICE request b/c \n"
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"paging, hiber, or crashdump file is present on device." ));
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status = STATUS_UNSUCCESSFUL;
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completeIrpHere = TRUE;
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}
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else
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{
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// We'll just pass this IRP down the driver stack. But
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// first, must change the IRP's status to STATUS_SUCCESS
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// (default is STATUS_NOT_SUPPORTED)
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irp->IoStatus.Status = STATUS_SUCCESS;
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}
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#else
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/*
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* We will pass this IRP down the driver stack.
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* However, we need to change the default status
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* from STATUS_NOT_SUPPORTED to STATUS_SUCCESS.
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*/
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irp->IoStatus.Status = STATUS_SUCCESS;
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#endif
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break;
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case IRP_MN_STOP_DEVICE:
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TRACE(TL_PNP_WARNING,("STOP_DEVICE\n"));
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if (devExt->state == STATE_SUSPENDED){
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status = STATUS_DEVICE_POWER_FAILURE;
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completeIrpHere = TRUE;
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}
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else {
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/*
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* Only set state to STOPPED if the device was
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* previously started successfully.
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*/
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if (devExt->state == STATE_STARTED){
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devExt->state = STATE_STOPPED;
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}
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}
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break;
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case IRP_MN_SURPRISE_REMOVAL: // Win2000 code base only
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TRACE(TL_PNP_WARNING,("SURPRISE_REMOVAL\n"));
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/*
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* We will pass this IRP down the driver stack.
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* However, we need to change the default status
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* from STATUS_NOT_SUPPORTED to STATUS_SUCCESS.
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*/
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irp->IoStatus.Status = STATUS_SUCCESS;
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/*
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* For now just set the STATE_REMOVING state so that
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* we don't do any more IO. We are guaranteed to get
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* IRP_MN_REMOVE_DEVICE soon; we'll do the rest of
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* the remove processing there.
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*/
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devExt->state = STATE_REMOVING;
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/*
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* Clean up and make sure to cancel pending request
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*/
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AVCStreamSurpriseRemoval(devExt);
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break;
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case IRP_MN_REMOVE_DEVICE:
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/*
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* Check the current state to guard against multiple
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* REMOVE_DEVICE IRPs.
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*/
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TRACE(TL_PNP_WARNING,("REMOVE_DEVICE\n"));
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if (devExt->state != STATE_REMOVED){
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devExt->state = STATE_REMOVED;
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/*
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* Clean up and make sure to cancel pending request
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* Note: there is no IRP_MN_SURPRISE_REMOVAL for Win9X
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*/
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AVCStreamSurpriseRemoval(devExt);
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/*
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* Send the REMOVE IRP down the stack asynchronously.
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* Do not synchronize sending down the REMOVE_DEVICE
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* IRP, because the REMOVE_DEVICE IRP must be sent
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* down and completed all the way back up to the sender
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* before we continue.
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*/
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IoCopyCurrentIrpStackLocationToNext(irp);
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status = IoCallDriver(devExt->topDevObj, irp);
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justReturnStatus = TRUE;
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TRACE(TL_PNP_WARNING,("REMOVE_DEVICE - waiting for %d irps to complete...\n",
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devExt->pendingActionCount));
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/*
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* We must for all outstanding IO to complete before
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* completing the REMOVE_DEVICE IRP.
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*
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* First do an extra decrement on the pendingActionCount.
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* This will cause pendingActionCount to eventually
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* go to -1 once all asynchronous actions on this
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* device object are complete.
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* Then wait on the event that gets set when the
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* pendingActionCount actually reaches -1.
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*/
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DecrementPendingActionCount(devExt);
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KeWaitForSingleObject( &devExt->removeEvent,
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Executive, // wait reason
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KernelMode,
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FALSE, // not alertable
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NULL ); // no timeout
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TRACE(TL_PNP_WARNING,("REMOVE_DEVICE - ... DONE waiting. \n"));
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#ifdef HANDLE_DEVICE_USAGE
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/*
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* If we locked-down certain paged code sections earlier
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* because of this device, then need to unlock them now
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* (before calling IoDeleteDevice)
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*/
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if( NULL != devExt->pagingPathUnlockHandle )
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{
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TRACE(TL_PNP_WARNING,("UNLOCKing some driver code (non-pageable) (b/c paging path)\n" ));
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MmUnlockPagableImageSection( devExt->pagingPathUnlockHandle );
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devExt->pagingPathUnlockHandle = NULL;
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}
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if( NULL != devExt->initUnlockHandle )
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{
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TRACE(TL_PNP_WARNING,("UNLOCKing some driver code (non-pageable) (b/c init conditions)\n" ));
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MmUnlockPagableImageSection( devExt->initUnlockHandle );
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devExt->initUnlockHandle = NULL;
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}
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#endif // HANDLE_DEVICE_USAGE
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/*
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* Detach our device object from the lower
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* device object stack.
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*/
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IoDetachDevice(devExt->topDevObj);
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/*
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* Delete our device object.
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* This will also delete the associated device extension.
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*/
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IoDeleteDevice(devExt->filterDevObj);
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}
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break;
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#ifdef HANDLE_DEVICE_USAGE
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case IRP_MN_DEVICE_USAGE_NOTIFICATION:
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//
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// Make sure the Type of this UsageNotification is one that we handle
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//
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if( irpSp->Parameters.UsageNotification.Type != DeviceUsageTypePaging
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&& irpSp->Parameters.UsageNotification.Type != DeviceUsageTypeHibernation
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&& irpSp->Parameters.UsageNotification.Type != DeviceUsageTypeDumpFile )
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{
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break; // out of the big switch statement (and just forward this IRP)
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}
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status = VA_DeviceUsageNotification(devExt, irp);
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justReturnStatus = TRUE;
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break;
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#endif // HANDLE_DEVICE_USAGE
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#ifdef HANDLE_DEVICE_USAGE
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case IRP_MN_QUERY_PNP_DEVICE_STATE:
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//
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// If a paging, hibernation, or crashdump file is currently open
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// on this device, must set NOT_DISABLEABLE flag in DeviceState
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//
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if( devExt->pagingFileCount != 0
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|| devExt->hibernationFileCount != 0
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|| devExt->crashdumpFileCount != 0 )
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{
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// Mark the device as not disableable
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PPNP_DEVICE_STATE pDeviceState;
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pDeviceState = (PPNP_DEVICE_STATE) &irp->IoStatus.Information;
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*pDeviceState |= PNP_DEVICE_NOT_DISABLEABLE;
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}
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//
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// We _did_ handle this IRP (as best we could), so set IRP's
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// status to STATUS_SUCCESS (default is STATUS_NOT_SUPPORTED)
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// before passing it down the driver stack
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//
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irp->IoStatus.Status = STATUS_SUCCESS;
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break;
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#endif // HANDLE_DEVICE_USAGE
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case IRP_MN_QUERY_DEVICE_RELATIONS:
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TRACE(TL_PNP_WARNING,("QUERY_DEVICE_RELATIONS\n"));
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break;
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default:
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TRACE(TL_PNP_WARNING,("Unprocessed PnP minorFunc (%d)\n", irpSp->MinorFunction));
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break;
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}
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if (justReturnStatus){
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/*
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* We've already sent this IRP down the stack.
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*/
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TRACE(TL_PNP_WARNING,("VA_PnP: St:%x; minor:%d; Already sent down the irp.\n", status, (ULONG)irpSp->MinorFunction));
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}
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else if (completeIrpHere){
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TRACE(TL_PNP_WARNING,("VA_PnP: St:%x; minor:%d; Completed Status:%x\n", status, (ULONG)irpSp->MinorFunction, status));
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irp->IoStatus.Status = status;
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IoCompleteRequest(irp, IO_NO_INCREMENT);
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}
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else {
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TRACE(TL_PNP_WARNING,("VA_PnP: ST:%x; minor:%d; Pass down irp:%x; devObj:%x\n", status, (ULONG)irpSp->MinorFunction, irp, devExt->topDevObj));
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IoCopyCurrentIrpStackLocationToNext(irp);
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status = IoCallDriver(devExt->topDevObj, irp);
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}
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EXIT("VA_PnP",status);
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return status;
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}
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#ifdef HANDLE_DEVICE_USAGE
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NTSTATUS
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VA_DeviceUsageNotification(struct DEVICE_EXTENSION *devExt, PIRP irp)
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{
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PIO_STACK_LOCATION irpSp;
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NTSTATUS status;
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BOOLEAN fSetPagable = FALSE; // whether we set the PAGABLE bit
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/// before we passed-on this IRP
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PAGED_CODE();
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irpSp = IoGetCurrentIrpStackLocation(irp);
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TRACE(TL_PNP_WARNING,("DEVICE_USAGE_NOTIFICATION (Type==%d , InPath==%d)\n"
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, irpSp->Parameters.UsageNotification.Type
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, irpSp->Parameters.UsageNotification.InPath
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));
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TRACE(TL_PNP_WARNING,(" [devExt=0x%08X fltrDevObj=0x%08X]\n", devExt, devExt->filterDevObj ));
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//
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// Wait on the paging path event (to prevent several instances of
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// this IRP from being processed at once)
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//
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status = KeWaitForSingleObject( &devExt->deviceUsageNotificationEvent
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, Executive // wait reason
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, KernelMode
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, FALSE // not alertable
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, NULL // no timeout
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);
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/*
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* IMPORTANT NOTE: When to modify our DO_POWER_PAGABLE bit depends
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* on whether it needs to be set or cleared. If the IRP indicates
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* our PAGABLE bit should be set, then we must set it _before_
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* forwarding the IRP down the driver stack (and possibly clear it
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* afterward, if lower drivers fail the IRP). But if the IRP
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* indicates that our PAGABLE bit should be cleared, then we must
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* first forward the IRP to lower drivers, and then clear our bit
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* only if the lower drivers return STATUS_SUCCESS.
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*/
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//
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// If removing last paging file from this device...
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//
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if( irpSp->Parameters.UsageNotification.Type == DeviceUsageTypePaging
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&& !irpSp->Parameters.UsageNotification.InPath
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&& devExt->pagingFileCount == 1 )
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{
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//
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// Set DO_POWER_PAGABLE bit (if it was set at startup).
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// If lower drivers fail this IRP, we'll clear it later.
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//
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TRACE(TL_PNP_WARNING,("Removing last paging file...\n" ));
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if( devExt->initialFlags & DO_POWER_PAGABLE )
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{
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TRACE(TL_PNP_WARNING,( "...so RE-setting PAGABLE bit\n" ));
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devExt->filterDevObj->Flags |= DO_POWER_PAGABLE;
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fSetPagable = TRUE;
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}
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else
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{
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TRACE(TL_PNP_WARNING,( "...but PAGABLE bit wasn't set initially, so not setting it now.\n" ));
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}
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}
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//
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// Forward the irp synchronously
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//
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IoCopyCurrentIrpStackLocationToNext( irp );
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status = CallNextDriverSync( devExt, irp );
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//
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// Now deal with the failure and success cases.
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//
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if( ! NT_SUCCESS(status) )
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{
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//
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// Lower drivers failed the IRP, so _undo_ any changes we
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// made before passing-on the IRP to those drivers.
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//
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if( fSetPagable )
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{
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TRACE(TL_PNP_WARNING,("IRP was failed, so UN-setting PAGABLE bit\n" ));
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devExt->filterDevObj->Flags &= ~DO_POWER_PAGABLE;
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}
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}
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else
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{
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//
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// Lower drivers returned SUCCESS, so we can do everything
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// that must be done in response to this IRP...
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//
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switch( irpSp->Parameters.UsageNotification.Type )
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{
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case DeviceUsageTypeHibernation:
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// Adjust counter
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IoAdjustPagingPathCount( &devExt->hibernationFileCount,
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irpSp->Parameters.UsageNotification.InPath );
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TRACE(TL_PNP_WARNING,("Num. Hibernation files is now %d\n", devExt->hibernationFileCount ));
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ASSERT( devExt->hibernationFileCount >= 0 );
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break;
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case DeviceUsageTypeDumpFile:
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// Adjust counter
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IoAdjustPagingPathCount( &devExt->crashdumpFileCount,
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irpSp->Parameters.UsageNotification.InPath );
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TRACE(TL_PNP_WARNING,("Num. Crashdump files is now %d\n", devExt->crashdumpFileCount ));
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ASSERT( devExt->crashdumpFileCount >= 0 );
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break;
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case DeviceUsageTypePaging:
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// Adjust counter
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IoAdjustPagingPathCount( &devExt->pagingFileCount,
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irpSp->Parameters.UsageNotification.InPath );
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TRACE(TL_PNP_WARNING,("Num. Paging files is now %d\n", devExt->pagingFileCount ));
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ASSERT( devExt->pagingFileCount >= 0 );
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//
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// If we've just switched between being pageable<->nonpageable...
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//
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if( irpSp->Parameters.UsageNotification.InPath
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&& devExt->pagingFileCount == 1 )
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{
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//
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// Just added a paging file, so clear the PAGABLE
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// flag, and lock-down the code for all routines
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// that could be called at IRQL >= DISPATCH_LEVEL
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// (so that they're _non-pageable_).
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//
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TRACE(TL_PNP_WARNING,("Just added first paging file...\n" ));
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TRACE(TL_PNP_WARNING,("...so clearing PAGABLE bit\n" ));
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devExt->filterDevObj->Flags &= ~DO_POWER_PAGABLE;
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TRACE(TL_PNP_WARNING,("LOCKing some driver code (non-pageable) (b/c paging path)\n" ));
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devExt->pagingPathUnlockHandle = MmLockPagableCodeSection( VA_Power ); // some func that's inside the code section that we want to lock
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ASSERT( NULL != devExt->pagingPathUnlockHandle );
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}
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else if ( !irpSp->Parameters.UsageNotification.InPath
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&& devExt->pagingFileCount == 0 )
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{
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//
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// Just removed the last paging file, but we
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// already set the PAGABLE flag (if necessary)
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// before forwarding IRP, so just remove the
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// _paging-path_ lock from this driver. (NOTE:
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// initial-condition lock might still be in place,
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// but that's what we want.)
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//
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TRACE(TL_PNP_WARNING,("UNLOCKing some driver code (pageable) (b/c paging path)\n" ));
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ASSERT( NULL != devExt->pagingPathUnlockHandle );
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MmUnlockPagableImageSection( devExt->pagingPathUnlockHandle );
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devExt->pagingPathUnlockHandle = NULL;
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}
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break;
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default:
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ASSERT( FALSE ); // should never get here (b/c checked for invalid Type earlier)
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} //END: switch on Type of special-file
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//
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// Invalidate state, so that certain flags will get updated
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//
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IoInvalidateDeviceState( devExt->physicalDevObj );
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}//END: handling of irp success/failure cases
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//
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// Set event so that the next DEVICE_USAGE_NOTIFICATION IRP that
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// comes along can be processed.
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//
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KeSetEvent( &devExt->deviceUsageNotificationEvent
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|
, IO_NO_INCREMENT
|
|
, FALSE
|
|
);
|
|
|
|
//
|
|
// Complete the irp
|
|
//
|
|
IoCompleteRequest( irp, IO_NO_INCREMENT );
|
|
return status;
|
|
}
|
|
#endif // HANDLE_DEVICE_USAGE
|
|
|
|
|
|
|
|
NTSTATUS GetDeviceCapabilities(struct DEVICE_EXTENSION *devExt)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Function retrieves the DEVICE_CAPABILITIES descriptor from the device
|
|
|
|
Arguments:
|
|
|
|
devExt - device extension for targetted device object
|
|
|
|
Return Value:
|
|
|
|
NT status code
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS status;
|
|
PIRP irp;
|
|
|
|
PAGED_CODE();
|
|
|
|
irp = IoAllocateIrp(devExt->topDevObj->StackSize, FALSE);
|
|
if (irp){
|
|
PIO_STACK_LOCATION nextSp = IoGetNextIrpStackLocation(irp);
|
|
|
|
// must initialize DeviceCapabilities before sending...
|
|
RtlZeroMemory( &devExt->deviceCapabilities,
|
|
sizeof(DEVICE_CAPABILITIES));
|
|
devExt->deviceCapabilities.Size = sizeof(DEVICE_CAPABILITIES);
|
|
devExt->deviceCapabilities.Version = 1;
|
|
devExt->deviceCapabilities.Address = -1;
|
|
devExt->deviceCapabilities.UINumber= -1;
|
|
|
|
|
|
// setup irp stack location...
|
|
nextSp->MajorFunction = IRP_MJ_PNP;
|
|
nextSp->MinorFunction = IRP_MN_QUERY_CAPABILITIES;
|
|
nextSp->Parameters.DeviceCapabilities.Capabilities =
|
|
&devExt->deviceCapabilities;
|
|
|
|
/*
|
|
* For any IRP you create, you must set the default status
|
|
* to STATUS_NOT_SUPPORTED before sending it.
|
|
*/
|
|
irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
|
|
|
|
status = CallNextDriverSync(devExt, irp);
|
|
|
|
IoFreeIrp(irp);
|
|
}
|
|
else {
|
|
status = STATUS_INSUFFICIENT_RESOURCES;
|
|
}
|
|
|
|
ASSERT(NT_SUCCESS(status));
|
|
return status;
|
|
}
|
|
|