DXGKCB_READ_DEVICE_SPACE callback function (dispmprt.h)

Article
05/22/2024

The DxgkCbReadDeviceSpace function reads from a device configuration space or the expansion ROM of a display adapter.

Syntax

DXGKCB_READ_DEVICE_SPACE DxgkcbReadDeviceSpace;

NTSTATUS DxgkcbReadDeviceSpace(
  [in]  HANDLE DeviceHandle,
  [in]  ULONG DataType,
  [in]  PVOID Buffer,
  [in]  ULONG Offset,
  [in]  ULONG Length,
  [out] PULONG BytesRead
)
{...}

Parameters

[in] DeviceHandle

A handle that represents a display adapter. The display miniport driver previously obtained this handle in the DeviceHandle member of the DXGKRNL_INTERFACE structure that was passed to DxgkDdiStartDevice.

[in] DataType

The type of read transaction to be performed. This parameter must be one of the following values, which are defined in Dispmprt.h.

DXGK_WHICHSPACE_BRIDGE

Read from the PCI Express (PCIe) root port's configuration space.

DXGK_WHICHSPACE_CONFIG

Read from the display adapter's configuration space.

DXGK_WHICHSPACE_MCH

Read from the configuration space of a memory controller hub that is a peer to the adapter's parent bus.

DXGK_WHICHSPACE_ROM

Read from the display adapter's expansion ROM.

[in] Buffer

A pointer to a caller-allocated buffer that receives the data read from the configuration space or ROM.

[in] Offset

The offset, into the configuration space or the expansion ROM, at which the read transaction begins.

[in] Length

The number of bytes to be read.

[out] BytesRead

A pointer to a ULONG-typed variable that receives the number of bytes actually read.

Return value

DxgkCbReadDeviceSpace returns one of the following values:

Return code	Description
STATUS_SUCCESS	The function succeeded.
STATUS_INVALID_PARAMETER	The DeviceHandle, DataType, or Buffer parameter is invalid.
STATUS_UNSUCCESSFUL	The function was unable to read the data.

Requirements

Requirement	Value
Minimum supported client	Windows Vista
Target Platform	Desktop
Header	dispmprt.h (include Dispmprt.h)
IRQL	PASSIVE_LEVEL

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