Obtaining PCI Segment Values

To obtain the Segment value for PCI Multi-Segment, use the DEVPKEY_Device_LocationInfo key.

Supported methods to obtain this property are:

• Kernel mode:
  • IoGetDeviceProperty
  • IoGetDevicePropertyData
• User mode:
  • SetupDiGetDeviceProperty
  • CM_Get_DevNode_Property

Upon successful call, you'll need to parse the returned string.

On single-segment system the string is in this format: PCI bus 1, device 2, function 3

On multi-segment system it looks like this: PCI segment 1 bus 2, device 3, function 4