Which Enhanced USB Controller port is a device connected to?

My application needs to know to which motherboard USB port a USB drive is
connected. Is it correct that each motherboard USB port is always assigned
the same Enhanced USB Controller port number?
If so, how to get the Enhanced USB Controller port number for a plugged USB
high speed device?
I was hoping to get a child device for each connection index from the
Usbview example, but so far do not know how to do it.
Is there a Windows (XP) API allowing to do this?
If no APIs in user mode, how can it be done in kernel mode from a filter
driver?