WDF_INTERRUPT_POLICY enumeration

[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                     = 0,
  WdfIrqPolicyAllCloseProcessors                 = 1,
  WdfIrqPolicyOneCloseProcessor                  = 2,
  WdfIrqPolicyAllProcessorsInMachine             = 3,
  WdfIrqPolicySpecifiedProcessors                = 4,
  WdfIrqPolicySpreadMessagesAcrossAllProcessors  = 5
} 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

End of support

Unavailable in UMDF 2.0 and later.

Minimum UMDF version

1.11

Header

Wudfinterrupt.h

See also

IWDFInterrupt::SetPolicy

 

 

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