WDF - how to share interrupt between two driver those are in the same stack?

Hi all,

I have a PCI card and I need to create a KMDF bus driver and create a
static KMDF child driver above that bus driver.

The bus driver can get hardware resources and the WDF automatically
connects and disconnects interrupts for the driver .

In the WDM, I can create a IOCTL to get interrupt resource from bus
driver and connect/disconnect the interrupt in the child driver.

I have no idea how to do that in WDF, because WDF will do that
automatically. My KMDF child driver never get any hardware resouces
when loaded.

I try this method below, but it can't work. The child report there is
no available resources and fail to load the driver.

May you hlep me? Thanks. ^_^

Step1:
Copy the CM_PARTIAL_RESOURCE_DESCRIPTOR about interrupt into the bus
driver's device extension.

Step2:
//----------------------------------------------------------------------
// When the bus driver create PDO for that child
//----------------------------------------------------------------------
WDF_PDO_EVENT_CALLBACKS_INIT(&pdoCallbacks);
pdoCallbacks.EvtDeviceResourceRequirementsQuery =
BusPdo_EvtDeviceResourceRequirementsQuery;
WdfPdoInitSetEventCallbacks(pDeviceInit, &pdoCallbacks);

Step3

In the BusPdo_EvtDeviceResourceRequirementsQuery function,
I try to copy the interrupt resource from step 2. Like this

//-----------------------------------------------------------------------
NTSTATUS status = STATUS_SUCCESS;
WDFIORESLIST logConfig;
IO_RESOURCE_DESCRIPTOR descriptor;

status = WdfIoResourceListCreate(
IoResourceRequirementsList,
WDF_NO_OBJECT_ATTRIBUTES,
&logConfig
);
if(!NT_SUCCESS(status)){
return status;
}

RtlZeroMemory(&descriptor, sizeof(descriptor));

descriptor.Option = 0;
descriptor.Type = CmResourceTypeInterrupt;
descriptor.ShareDisposition = CmResourceShareShared
descriptor.Flags= RESOURCE_INTERRUPT_LEVEL_SENSITIVE
descriptor.u.Interrupt.MinimumVector =
fdoData->InterruptDescriptor.u.Interrupt.Vector;

descriptor.u.Interrupt.MaximumVector =
fdoData->InterruptDescriptor.u.Interrupt.Vector;

descriptor.u.Interrupt.TargetedProcessors=
fdoData->InterruptDescriptor.u.Interrupt.Affinity;

descriptor.u.Interrupt.AffinityPolicy= IrqPolicyMachineDefault;
descriptor.u.Interrupt.PriorityPolicy = IrqPriorityUndefined;

status = WdfIoResourceListAppendDescriptor(logConfig, &descriptor);
if(!NT_SUCCESS(status)){
return status;
}

status = WdfIoResourceRequirementsListAppendIoResList(

IoResourceRequirementsList,
logConfig
);

status = WdfIoResourceListAppendDescriptor(logConfig, &descriptor);
if(!NT_SUCCESS(status)){
return status;
}

return status;


.

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