winapiwindows-xppciwdkpci-bus

Retrieving PCI coordinates by Windows' API (user mode)


Is there a way to obtain PCI coordinates (bus/slot/function numbers) of devices by using Windows c/c++ API (e.g PnP Configuration Manager API)? I already know how to do it in kernel mode, I need an user-mode solution. My target system is Windows XP-32 bit.


Solution

  • I've eventually found a simple solution (it was just a matter of digging into MSDN).

    This minimal code finds the device's PCI coordinates in terms of bus/slot/function:

    DWORD bus, addr, slot, func;
    HDEVINFO h; // Obtained by SetupDiGetClassDevs
    SP_DEVINFO_DATA d; // Filled by SetupDiGetDeviceInterfaceDetail
    
    SetupDiGetDeviceRegistryProperty(h,&d,SPDRP_BUSNUMBER,NULL,&bus,sizeof(bus),NULL);
    SetupDiGetDeviceRegistryProperty(h,&d,SPDRP_ADDRESS,NULL,&addr,sizeof(addr),NULL);
    slot = (addr >> 16) & 0xFFFF;
    func = addr & 0xFFFF;
    

    Note: for real production the output buffer's size must be obtained by a previous call of the API function in order to allocate it dynamically, and error checks must be added, of course.