PCI slot detection driver

modulename: pci_slot.ko

configname: CONFIG_ACPI_PCI_SLOT

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>PCI slot detection driver
In linux kernel since version 4.2 (release Date: 2015-08-30)  
This driver creates entries in /sys/bus/pci/slots/ for all PCI
slots in the system. This can help correlate PCI bus addresses,
i.e., segment/bus/device/function tuples, with physical slots in
the system. If you are unsure, say N.

source code: