The IRQ_DEVICE_POLICY enumeration type indicates the policy the system can use to assign interrupts to a device on different processors.

typedef enum {
  IrqPolicyMachineDefault = 0,
  IrqPolicyAllCloseProcessors,
  IrqPolicyOneCloseProcessor,
  IrqPolicyAllProcessorsInMachine,
  IrqPolicySpecifiedProcessors,
  IrqPolicySpreadMessagesAcrossAllProcessors
} IRQ_DEVICE_POLICY, *PIRQ_DEVICE_POLICY;

Values

IrqPolicyMachineDefault

Specifies the device does not require any particular assignment of interrupts to processors.

IrqPolicyAllCloseProcessors

Specifies that the system should assign interrupts for the device on processors that are close to the device. On non-NUMA computers, the effect of this value is identical to that of IrqPolicyAllProcessorsInMachine.

IrqPolicyOneCloseProcessor

Specifies that the system should assign a single interrupt for the device on one processor that is close to the device. On non-NUMA computers, the system can assign the interrupt on any processor.

IrqPolicyAllProcessorsInMachine

Specifies that the system should assign interrupts for the device on all processors.

IrqPolicySpecifiedProcessors

Specifies that the system should assign interrupts for the device on a specific set of processors.

IrqPolicySpreadMessagesAcrossAllProcessors

Specifies that the system should assign different message-based interrupts to different processors, if possible.

Requirements

Headers: Declared in Wdm.h. Include Wdm.h, Ntddk.h, or Ntifs.h.

See Also

IO_RESOURCE_DESCRIPTOR