IRQ_DEVICE_POLICY - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// miniport.h

typedef enum _IRQ_DEVICE_POLICY {
  IrqPolicyMachineDefault,
  IrqPolicyAllCloseProcessors,
  IrqPolicyOneCloseProcessor,
  IrqPolicyAllProcessorsInMachine,
  IrqPolicySpecifiedProcessors,
  IrqPolicySpreadMessagesAcrossAllProcessors,
  IrqPolicyAllProcessorsInMachineWhenSteered
} IRQ_DEVICE_POLICY, *PIRQ_DEVICE_POLICY;
View the official Windows Driver Kit DDI reference
// wdm.h

typedef enum _IRQ_DEVICE_POLICY {
  IrqPolicyMachineDefault = 0,
  IrqPolicyAllCloseProcessors = 1,
  IrqPolicyOneCloseProcessor = 2,
  IrqPolicyAllProcessorsInMachine = 3,
  IrqPolicySpecifiedProcessors = 4,
  IrqPolicySpreadMessagesAcrossAllProcessors = 5,
  IrqPolicyAllProcessorsInMachineWhenSteered = 6
} IRQ_DEVICE_POLICY, *PIRQ_DEVICE_POLICY;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ne-miniport-_irq_device_policy)

_IRQ_DEVICE_POLICY enumeration (miniport.h)

Description

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

Constants

IrqPolicyMachineDefault

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

IrqPolicyAllCloseProcessors

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

IrqPolicyOneCloseProcessor

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

IrqPolicyAllProcessorsInMachine

The operating system should assign interrupts from the device to all processors.

IrqPolicySpecifiedProcessors

The operating system should assign interrupts from the device to a specific set of processors.

IrqPolicySpreadMessagesAcrossAllProcessors

The operating system should assign different message-signaled interrupts to different processors, if possible.

IrqPolicyAllProcessorsInMachineWhenSteered

Remarks

The Interrupt.AffinityPolicy member of the IO_RESOURCE_DESCRIPTOR structure is an IRQ_DEVICE_POLICY enumeration value.

See also

IO_RESOURCE_DESCRIPTOR

View the official Windows Driver Kit DDI reference

Edit description on GitHub

Windows Driver Kit DDI reference (ne-wdm-_irq_device_policy)

_IRQ_DEVICE_POLICY enumeration (wdm.h)

Description

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

Constants

IrqPolicyMachineDefault:0

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

IrqPolicyAllCloseProcessors:1

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

IrqPolicyOneCloseProcessor:2

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

IrqPolicyAllProcessorsInMachine:3

The operating system should assign interrupts from the device to all processors.

IrqPolicySpecifiedProcessors:4

The operating system should assign interrupts from the device to a specific set of processors.

IrqPolicySpreadMessagesAcrossAllProcessors:5

The operating system should assign different message-signaled interrupts to different processors, if possible.

IrqPolicyAllProcessorsInMachineWhenSteered:6

Reserved for system use. Do not use in your driver.

Remarks

The Interrupt.AffinityPolicy member of the IO_RESOURCE_DESCRIPTOR structure is an IRQ_DEVICE_POLICY enumeration value.

See also

View the official Windows Driver Kit DDI reference

Edit description on GitHub