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IOMMU_DEVICE_QUERY_INFORMATION takes an IOMMU_DMA_DEVICE token and returns the device info.
Syntax
IOMMU_DEVICE_QUERY_INFORMATION IommuDeviceQueryInformation;
NTSTATUS IommuDeviceQueryInformation(
PIOMMU_DMA_DEVICE DmaDevice,
ULONG Size,
PULONG BytesWritten,
PIOMMU_DMA_DEVICE_INFORMATION Buffer
)
{...}
Parameters
DmaDevice
[in] Pointer to the IOMMU_DMA_DEVICE token.
Size
[in] Supplies the size in bytes of the provided buffer.
BytesWritten
[out] Pointer to receive the number of bytes written to the buffer.
Buffer
[out] Pointer to a IOMMU_DMA_DEVICE_INFORMATION structure that receives the device information.
Return value
Returns an NTSTATUS value. Possible values include:
| Return code | Description |
|---|---|
| STATUS_SUCCESS | If the device info was successfully written into the buffer. |
| STATUS_BUFFER_TOO_SMALL | If the provided buffer does not meet minimum size requirements. |
Requirements
| Requirement | Value |
|---|---|
| Header | wdm.h |
| IRQL | PASSIVE_LEVEL |