673 lines
20 KiB
C
673 lines
20 KiB
C
/*--------------------------------------------------------------------------
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*
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* Copyright (C) Cyclades Corporation, 1996-2001.
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* All rights reserved.
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*
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* Cyclom-Y Port Driver
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*
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* This file: cyymask.c
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*
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* Description: This module contains the code related to get/set/wait
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* on event mask operations in the Cyclom-Y Port driver.
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*
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* Notes: This code supports Windows 2000 and Windows XP,
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* x86 and IA64 processors.
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*
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* Complies with Cyclades SW Coding Standard rev 1.3.
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*
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*--------------------------------------------------------------------------
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*/
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/*-------------------------------------------------------------------------
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*
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* Change History
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*
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*--------------------------------------------------------------------------
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*
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*
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*--------------------------------------------------------------------------
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*/
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#include "precomp.h"
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BOOLEAN
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CyyGrabWaitFromIsr(
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IN PVOID Context
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);
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BOOLEAN
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CyyGiveWaitToIsr(
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IN PVOID Context
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);
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BOOLEAN
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CyyFinishOldWait(
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IN PVOID Context
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGESER,CyyStartMask)
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#pragma alloc_text(PAGESER,CyyCancelWait)
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#pragma alloc_text(PAGESER,CyyGrabWaitFromIsr)
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#pragma alloc_text(PAGESER,CyyGiveWaitToIsr)
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#pragma alloc_text(PAGESER,CyyFinishOldWait)
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#endif
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NTSTATUS
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CyyStartMask(
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IN PCYY_DEVICE_EXTENSION Extension
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)
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/*++
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Routine Description:
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This routine is used to process the set mask and wait
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mask ioctls. Calls to this routine are serialized by
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placing irps in the list under the protection of the
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cancel spin lock.
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Arguments:
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Extension - A pointer to the serial device extension.
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Return Value:
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Will return pending for everything put the first
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request that we actually process. Even in that
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case it will return pending unless it can complete
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it right away.
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--*/
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{
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//
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// The current stack location. This contains much of the
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// information we need to process this particular request.
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//
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PIO_STACK_LOCATION IrpSp;
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PIRP NewIrp;
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BOOLEAN SetFirstStatus = FALSE;
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NTSTATUS FirstStatus;
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CYY_LOCKED_PAGED_CODE();
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CyyDbgPrintEx(CYYDIAG3, "In CyyStartMask\n");
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ASSERT(Extension->CurrentMaskIrp);
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do {
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CyyDbgPrintEx(CYYDIAG4, "STARTMASK - CurrentMaskIrp: %x\n",
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Extension->CurrentMaskIrp);
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IrpSp = IoGetCurrentIrpStackLocation(Extension->CurrentMaskIrp);
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ASSERT((IrpSp->Parameters.DeviceIoControl.IoControlCode ==
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IOCTL_SERIAL_WAIT_ON_MASK) ||
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(IrpSp->Parameters.DeviceIoControl.IoControlCode ==
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IOCTL_SERIAL_SET_WAIT_MASK));
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if (IrpSp->Parameters.DeviceIoControl.IoControlCode ==
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IOCTL_SERIAL_SET_WAIT_MASK) {
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CyyDbgPrintEx(CYYDIAG4, "%x is a SETMASK irp\n",
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Extension->CurrentMaskIrp);
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//
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// Complete the old wait if there is one.
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//
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KeSynchronizeExecution(
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Extension->Interrupt,
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CyyFinishOldWait,
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Extension
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);
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//
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// Any current waits should be on its way to completion
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// at this point. There certainly shouldn't be any
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// irp mask location.
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//
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ASSERT(!Extension->IrpMaskLocation);
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Extension->CurrentMaskIrp->IoStatus.Status = STATUS_SUCCESS;
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if (!SetFirstStatus) {
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CyyDbgPrintEx(CYYDIAG4, "%x was the first irp processed by "
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"this\n"
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"------- invocation of startmask\n",
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Extension->CurrentMaskIrp);
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FirstStatus = STATUS_SUCCESS;
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SetFirstStatus = TRUE;
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}
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//
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// The following call will also cause the current
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// call to be completed.
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//
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CyyGetNextIrp(
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&Extension->CurrentMaskIrp,
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&Extension->MaskQueue,
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&NewIrp,
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TRUE,
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Extension
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);
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CyyDbgPrintEx(CYYDIAG4, "Perhaps another mask irp was found in "
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"the queue\n"
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"------- %x/%x <- values should be the same\n",
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Extension->CurrentMaskIrp,NewIrp);
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} else {
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//
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// First make sure that we have a non-zero mask.
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// If the app queues a wait on a zero mask it can't
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// be statisfied so it makes no sense to start it.
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//
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if ((!Extension->IsrWaitMask) || (Extension->CurrentWaitIrp)) {
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CyyDbgPrintEx(CYYDIAG4, "WaitIrp is invalid\n"
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"------- IsrWaitMask: %x\n"
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"------- CurrentWaitIrp: %x\n",
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Extension->IsrWaitMask,
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Extension->CurrentWaitIrp);
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Extension->CurrentMaskIrp->IoStatus.Status
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= STATUS_INVALID_PARAMETER;
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if (!SetFirstStatus) {
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CyyDbgPrintEx(CYYDIAG4, "%x was the first irp processed "
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"by this\n"
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"------- invocation of startmask\n",
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Extension->CurrentMaskIrp);
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FirstStatus = STATUS_INVALID_PARAMETER;
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SetFirstStatus = TRUE;
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}
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CyyGetNextIrp(&Extension->CurrentMaskIrp,
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&Extension->MaskQueue, &NewIrp, TRUE,
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Extension);
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CyyDbgPrintEx(CYYDIAG4, "Perhaps another mask irp was found "
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"in the queue\n"
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"------- %x/%x <- values should be the same\n",
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Extension->CurrentMaskIrp,NewIrp);
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} else {
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KIRQL OldIrql;
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//
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// Make the current mask irp the current wait irp and
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// get a new current mask irp. Note that when we get
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// the new current mask irp we DO NOT complete the
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// old current mask irp (which is now the current wait
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// irp.
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//
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// Then under the protection of the cancel spin lock
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// we check to see if the current wait irp needs to
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// be canceled
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//
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IoAcquireCancelSpinLock(&OldIrql);
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if (Extension->CurrentMaskIrp->Cancel) {
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CyyDbgPrintEx(CYYDIAG4, "%x irp was already marked as "
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"cancelled\n", Extension->CurrentMaskIrp);
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IoReleaseCancelSpinLock(OldIrql);
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Extension->CurrentMaskIrp->IoStatus.Status = STATUS_CANCELLED;
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if (!SetFirstStatus) {
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CyyDbgPrintEx(CYYDIAG4, "%x was the first irp "
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"processed by this\n"
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"------- invocation of startmask\n",
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Extension->CurrentMaskIrp);
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FirstStatus = STATUS_CANCELLED;
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SetFirstStatus = TRUE;
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}
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CyyGetNextIrp(&Extension->CurrentMaskIrp,
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&Extension->MaskQueue, &NewIrp, TRUE,
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Extension);
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CyyDbgPrintEx(CYYDIAG4, "Perhaps another mask irp was "
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"found in the queue\n"
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"------- %x/%x <- values should be the "
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"same\n", Extension->CurrentMaskIrp,
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NewIrp);
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} else {
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CyyDbgPrintEx(CYYDIAG4, "%x will become the current "
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"wait irp\n", Extension->CurrentMaskIrp);
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if (!SetFirstStatus) {
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CyyDbgPrintEx(CYYDIAG4, "%x was the first irp "
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"processed by this\n"
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"------- invocation of startmask\n",
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Extension->CurrentMaskIrp);
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FirstStatus = STATUS_PENDING;
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SetFirstStatus = TRUE;
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//
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// If we haven't already set a first status
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// then there is a chance that this packet
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// was never on the queue. We should mark
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// it as pending.
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//
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IoMarkIrpPending(Extension->CurrentMaskIrp);
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}
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//
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// There should never be a mask location when
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// there isn't a current wait irp. At this point
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// there shouldn't be a current wait irp also.
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//
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ASSERT(!Extension->IrpMaskLocation);
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ASSERT(!Extension->CurrentWaitIrp);
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Extension->CurrentWaitIrp = Extension->CurrentMaskIrp;
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SERIAL_INIT_REFERENCE(Extension->CurrentWaitIrp);
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IoSetCancelRoutine(
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Extension->CurrentWaitIrp,
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CyyCancelWait
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);
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//
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// Since the cancel routine has a reference to
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// the irp we need to update the reference
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// count.
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//
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SERIAL_SET_REFERENCE(
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Extension->CurrentWaitIrp,
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SERIAL_REF_CANCEL
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);
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KeSynchronizeExecution(
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Extension->Interrupt,
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CyyGiveWaitToIsr,
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Extension
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);
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// Code removed because it was causing blue-screen in the Modem Share
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// test case 77. When CurrentMaskIrp is set to NULL, we remove the
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// protection that avoid Starter to be called in CyyStartOrQueue.
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// We will let CyyGetNextIrp null out that pointer. Fanny.
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//
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// //
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// // Since it isn't really the mask irp anymore,
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// // null out that pointer.
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// //
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//
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// Extension->CurrentMaskIrp = NULL;
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Extension->CurrentMaskIrp = NULL; // back in Windows 2000. Fanny
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//
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// This will release the cancel spinlock for us
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//
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CyyGetNextIrpLocked(&Extension->CurrentMaskIrp,
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&Extension->MaskQueue, &NewIrp,
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FALSE, Extension, OldIrql);
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CyyDbgPrintEx(CYYDIAG4, "Perhaps another mask irp was "
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"found in the queue\n"
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"------- %x/%x <- values should be the "
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"same\n", Extension->CurrentMaskIrp,
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NewIrp);
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}
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}
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}
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} while (NewIrp);
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return FirstStatus;
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}
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BOOLEAN
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CyyGrabWaitFromIsr(
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IN PVOID Context
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)
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/*++
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Routine Description:
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This routine will check to see if the ISR still knows about
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a wait irp by checking to see if the IrpMaskLocation is non-null.
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If it is then it will zero the Irpmasklocation (which in effect
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grabs the irp away from the isr). This routine is only called
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buy the cancel code for the wait.
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NOTE: This is called by KeSynchronizeExecution.
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Arguments:
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Context - A pointer to the device extension
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Return Value:
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Always FALSE.
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--*/
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{
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PCYY_DEVICE_EXTENSION Extension = Context;
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CYY_LOCKED_PAGED_CODE();
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CyyDbgPrintEx(CYYDIAG3, "In CyyGrabWaitFromIsr\n");
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if (Extension->IrpMaskLocation) {
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CyyDbgPrintEx(CYYDIAG4, "The isr still owns the irp %x, mask "
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"location is %x\n"
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"------- and system buffer is %x\n",
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Extension->CurrentWaitIrp,Extension->IrpMaskLocation,
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Extension->CurrentWaitIrp->AssociatedIrp.SystemBuffer);
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//
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// The isr still "owns" the irp.
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//
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*Extension->IrpMaskLocation = 0;
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Extension->IrpMaskLocation = NULL;
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Extension->CurrentWaitIrp->IoStatus.Information = sizeof(ULONG);
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//
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// Since the isr no longer references the irp we need to
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// decrement the reference count.
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//
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SERIAL_CLEAR_REFERENCE(
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Extension->CurrentWaitIrp,
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SERIAL_REF_ISR
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);
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}
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return FALSE;
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}
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BOOLEAN
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CyyGiveWaitToIsr(
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IN PVOID Context
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)
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/*++
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Routine Description:
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This routine simply sets a variable in the device extension
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so that the isr knows that we have a wait irp.
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NOTE: This is called by KeSynchronizeExecution.
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NOTE: This routine assumes that it is called with the
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cancel spinlock held.
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Arguments:
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Context - Simply a pointer to the device extension.
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Return Value:
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Always FALSE.
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--*/
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{
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PCYY_DEVICE_EXTENSION Extension = Context;
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CYY_LOCKED_PAGED_CODE();
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CyyDbgPrintEx(CYYDIAG3, "In CyyGiveWaitToIsr\n");
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//
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// There certainly shouldn't be a current mask location at
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// this point since we have a new current wait irp.
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//
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ASSERT(!Extension->IrpMaskLocation);
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//
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// The isr may or may not actually reference this irp. It
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// won't if the wait can be satisfied immediately. However,
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// since it will then go through the normal completion sequence,
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// we need to have an incremented reference count anyway.
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//
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SERIAL_SET_REFERENCE(
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Extension->CurrentWaitIrp,
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SERIAL_REF_ISR
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);
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if (!Extension->HistoryMask) {
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CyyDbgPrintEx(CYYDIAG4, "No events occured prior to the wait call"
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"\n");
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//
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// Although this wait might not be for empty transmit
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// queue, it doesn't hurt anything to set it to false.
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//
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Extension->EmptiedTransmit = FALSE;
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//
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// Record where the "completion mask" should be set.
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//
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Extension->IrpMaskLocation =
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Extension->CurrentWaitIrp->AssociatedIrp.SystemBuffer;
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CyyDbgPrintEx( CYYDIAG4, "The isr owns the irp %x, mask location is "
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"%x\n"
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"------- and system buffer is %x\n",
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Extension->CurrentWaitIrp,Extension->IrpMaskLocation,
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Extension->CurrentWaitIrp->AssociatedIrp
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.SystemBuffer);
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} else {
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CyyDbgPrintEx(CYYDIAG4, "%x occurred prior to the wait - starting "
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"the\n"
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"------- completion code for %x\n",
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Extension->HistoryMask,Extension->CurrentWaitIrp);
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*((ULONG *)Extension->CurrentWaitIrp->AssociatedIrp.SystemBuffer) =
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Extension->HistoryMask;
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Extension->HistoryMask = 0;
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Extension->CurrentWaitIrp->IoStatus.Information = sizeof(ULONG);
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Extension->CurrentWaitIrp->IoStatus.Status = STATUS_SUCCESS;
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CyyInsertQueueDpc(&Extension->CommWaitDpc, NULL, NULL, Extension);
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}
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return FALSE;
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}
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BOOLEAN
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CyyFinishOldWait(
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IN PVOID Context
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)
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/*++
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Routine Description:
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This routine will check to see if the ISR still knows about
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a wait irp by checking to see if the Irpmasklocation is non-null.
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If it is then it will zero the Irpmasklocation (which in effect
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grabs the irp away from the isr). This routine is only called
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buy the cancel code for the wait.
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NOTE: This is called by KeSynchronizeExecution.
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Arguments:
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Context - A pointer to the device extension
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Return Value:
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Always FALSE.
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--*/
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{
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PCYY_DEVICE_EXTENSION Extension = Context;
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CYY_LOCKED_PAGED_CODE();
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CyyDbgPrintEx(CYYDIAG3, "In CyyFinishOldWait\n");
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if (Extension->IrpMaskLocation) {
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CyyDbgPrintEx(CYYDIAG4, "The isr still owns the irp %x, mask "
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"location is %x\n"
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"------- and system buffer is %x\n",
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Extension->CurrentWaitIrp,Extension->IrpMaskLocation,
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Extension->CurrentWaitIrp->AssociatedIrp.SystemBuffer);
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//
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// The isr still "owns" the irp.
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//
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*Extension->IrpMaskLocation = 0;
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Extension->IrpMaskLocation = NULL;
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Extension->CurrentWaitIrp->IoStatus.Information = sizeof(ULONG);
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//
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// We don't decrement the reference since the completion routine
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// will do that.
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//
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CyyInsertQueueDpc(&Extension->CommWaitDpc, NULL, NULL, Extension);
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}
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//
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// Don't wipe out any historical data we are still interested in.
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//
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Extension->HistoryMask &= *((ULONG *)Extension->CurrentMaskIrp->
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AssociatedIrp.SystemBuffer);
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Extension->IsrWaitMask = *((ULONG *)Extension->CurrentMaskIrp->
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AssociatedIrp.SystemBuffer);
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CyyDbgPrintEx( CYYDIAG4, "Set mask location of %x, in irp %x, with "
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"system buffer of %x\n",
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Extension->IrpMaskLocation, Extension->CurrentMaskIrp,
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Extension->CurrentMaskIrp->AssociatedIrp.SystemBuffer);
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return FALSE;
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}
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VOID
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CyyCancelWait(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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|
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Routine Description:
|
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|
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This routine is used to cancel a irp that is waiting on
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a comm event.
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Arguments:
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DeviceObject - Pointer to the device object for this device
|
||
|
||
Irp - Pointer to the IRP for the current request
|
||
|
||
Return Value:
|
||
|
||
None.
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
PCYY_DEVICE_EXTENSION Extension = DeviceObject->DeviceExtension;
|
||
CYY_LOCKED_PAGED_CODE();
|
||
|
||
CyyDbgPrintEx(CYYDIAG3, "In CyyCancelWait\n");
|
||
|
||
CyyDbgPrintEx(CYYDIAG4, "Canceling wait for irp %x\n",
|
||
Extension->CurrentWaitIrp);
|
||
|
||
CyyTryToCompleteCurrent(Extension, CyyGrabWaitFromIsr,
|
||
Irp->CancelIrql, STATUS_CANCELLED,
|
||
&Extension->CurrentWaitIrp, NULL, NULL, NULL,
|
||
NULL, NULL, SERIAL_REF_CANCEL);
|
||
|
||
}
|
||
|
||
VOID
|
||
CyyCompleteWait(
|
||
IN PKDPC Dpc,
|
||
IN PVOID DeferredContext,
|
||
IN PVOID SystemContext1,
|
||
IN PVOID SystemContext2
|
||
)
|
||
|
||
{
|
||
PCYY_DEVICE_EXTENSION Extension = DeferredContext;
|
||
KIRQL OldIrql;
|
||
|
||
|
||
CyyDbgPrintEx(DPFLTR_TRACE_LEVEL, ">CyyCompleteWait(%X)\n",
|
||
Extension);
|
||
|
||
CyyDbgPrintEx(CYYDIAG3, "In CyyCompleteWait\n");
|
||
|
||
UNREFERENCED_PARAMETER(SystemContext1);
|
||
UNREFERENCED_PARAMETER(SystemContext2);
|
||
|
||
IoAcquireCancelSpinLock(&OldIrql);
|
||
|
||
CyyDbgPrintEx(CYYDIAG4, "Completing wait for irp %x\n",
|
||
Extension->CurrentWaitIrp);
|
||
|
||
CyyTryToCompleteCurrent(Extension, NULL, OldIrql, STATUS_SUCCESS,
|
||
&Extension->CurrentWaitIrp, NULL, NULL, NULL,
|
||
NULL, NULL, SERIAL_REF_ISR);
|
||
|
||
CyyDpcEpilogue(Extension, Dpc);
|
||
|
||
|
||
CyyDbgPrintEx(DPFLTR_TRACE_LEVEL, "<CyyCompleteWait\n");
|
||
}
|