+.B -s [[<bus>]:][<slot>][.[<func>]]
+Show only devices in specified bus, slot and function. Each component of the device
+address can be omitted or set as "*" meaning "any value". All numbers are
+hexadecimal. E.g., "0:" means all devices on bus 0, "0" means all functions of device 0
+on any bus, "0.3" selects third function of device 0 on all busses and ".4" shows only
+fourth function of each device.