// wdm.h

typedef struct _DMA_IOMMU_INTERFACE_EX {
  SIZE_T Size;
  ULONG  Version;
  union {
    DMA_IOMMU_INTERFACE_V1 V1;
    DMA_IOMMU_INTERFACE_V2 V2;
    DMA_IOMMU_INTERFACE_V3 V3;
  };
} DMA_IOMMU_INTERFACE_EX, *PDMA_IOMMU_INTERFACE_EX;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-wdm-dma_iommu_interface_ex)

Description

An interface structure that allows device drivers to interface with the IOMMU functions that perform device domain operations.

Members

`Size`

The size (in bytes) of the interface structure.

`Version`

The interface version number that determines the set of interface functions that are provided by this interface structure.

`V1`

A DMA_IOMMU_INTERFACE_V1 structure that specifies the set of Version 1 (V1) IOMMU interface functions.

These are the same set of functions as those provided by the deprecated DMA_IOMMU_INTERFACE structure.

`V2`

A DMA_IOMMU_INTERFACE_V2 structure that specifies the set of Version 2 (V2) IOMMU interface functions.

`V3`

A DMA_IOMMU_INTERFACE_V3 structure that specifies the set of Version 3 (V3) IOMMU interface functions.

Remarks

Use this structure for V1 functions instead of the deprecated DMA_IOMMU_INTERFACE structure.

DMA_IOMMU_INTERFACE_EX - NtDoc