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WDF_INTERRUPT_POLICY enumeration (wudfinterrupt.h)

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[Warning: UMDF 2 is the latest version of UMDF and supersedes UMDF 1. All new UMDF drivers should be written using UMDF 2. No new features are being added to UMDF 1 and there is limited support for UMDF 1 on newer versions of Windows 10. Universal Windows drivers must use UMDF 2. For more info, see Getting Started with UMDF.]

The WDF_INTERRUPT_POLICY enumeration type identifies the affinity policies that the Plug and Play (PnP) manager can use when it assigns a device's interrupts to the processors of a multiprocessor system.

Syntax

typedef enum _WDF_INTERRUPT_POLICY {
  WdfIrqPolicyMachineDefault,
  WdfIrqPolicyAllCloseProcessors,
  WdfIrqPolicyOneCloseProcessor,
  WdfIrqPolicyAllProcessorsInMachine,
  WdfIrqPolicySpecifiedProcessors,
  WdfIrqPolicySpreadMessagesAcrossAllProcessors
} WDF_INTERRUPT_POLICY, *PWDF_INTERRUPT_POLICY;

Constants

 
WdfIrqPolicyMachineDefault
Use the system's default affinity policy.
WdfIrqPolicyAllCloseProcessors
For NUMA systems, the PnP manager should assign the device's interrupts to processors that are close to the device. For non-NUMA systems, specifying WdfIrqPolicyAllCloseProcessors is the same as specifying WdfIrqPolicyAllProcessorsInMachine.
WdfIrqPolicyOneCloseProcessor
For NUMA systems, the PnP manager should assign one interrupt to a processor that is close to the device. For non-NUMA systems, the PnP manager can assign the interrupt to any processor.
WdfIrqPolicyAllProcessorsInMachine
The PnP manager can assign a device's interrupts to any of the system's processors.
WdfIrqPolicySpecifiedProcessors
The PnP manager should assign the device's interrupts only to specified processors.
WdfIrqPolicySpreadMessagesAcrossAllProcessors
The PnP manager should assign different message-based interrupts to different processors, if possible.

Remarks

The WDF_INTERRUPT_POLICY enumeration type is used as input to the IWDFInterrupt::SetPolicy method.

Requirements

Requirement Value
Minimum UMDF version 1.11
Header wudfinterrupt.h

See also

IWDFInterrupt::SetPolicy