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117 lines
2.7 KiB
C++
117 lines
2.7 KiB
C++
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/*++
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Copyright (c) Microsoft. All rights reserved.
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Module Name:
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FxWatchDog.hpp
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Abstract:
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This module implements the watchdog utility class for the power and power
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policy state machines
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Author:
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Environment:
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Both kernel and user mode
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Revision History:
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--*/
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#ifndef __FX_WATCHDOG__
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#define __FX_WATCHDOG__
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struct FxWatchdog {
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FxWatchdog(
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__in FxPkgPnp* PkgPnp
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)
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{
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m_PkgPnp = PkgPnp;
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}
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VOID
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StartTimer(
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__in ULONG State
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)
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{
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LARGE_INTEGER time;
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NTSTATUS status;
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if (State & WdfDevStateNP) {
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//
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// This is a non-pageable state. So we set the timer watchdog.
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// If it fires, it means that the driver stalled, probably due
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// to a page fault, which means that the whole machine is wedged.
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// We will then attempt to put the failure in the trace log
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// and bring the machine down, hopefully getting the reason we
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// stopped responding into the crashdump. (This will probably only work
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// if the machine is hibernating.)
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//
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// If the state function returns, then we'll cancel the timer
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// and no love will be lost.
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//
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status = m_Timer.Initialize(this, _WatchdogDpc, 0);
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//
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// This code is not used in UM. Hence we can assert and assume that
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// timer start will always be successful.
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//
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WDF_VERIFY_KM_ONLY_CODE();
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FX_ASSERT_AND_ASSUME_FOR_PREFAST(NT_SUCCESS(status));
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m_CallingThread = Mx::MxGetCurrentThread();
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if (m_PkgPnp->m_SharedPower.m_ExtendWatchDogTimer) {
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//
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// 24 hours:
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// 60 = to minutes
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// 60 = to hours
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// 24 = number of hours
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//
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time.QuadPart = WDF_REL_TIMEOUT_IN_SEC(60 * 60 * 24);
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}
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else {
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//
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// 10 minutes from now (same as the Vista timeout)
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//
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time.QuadPart = WDF_REL_TIMEOUT_IN_SEC(60 * 10);
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}
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m_Timer.Start(time);
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}
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}
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VOID
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CancelTimer(
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__in ULONG State
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)
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{
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if (State & WdfDevStateNP) {
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//
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// The state was successfully handled without the timer expiring.
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// We don't care about the return code in this case.
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//
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(void) m_Timer.Stop();
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}
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}
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static
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MdDeferredRoutineType
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_WatchdogDpc;
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MxTimer m_Timer;
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FxPkgPnp* m_PkgPnp;
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MxThread m_CallingThread;
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};
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#endif // __FX_WATCHDOG__
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