CONFIG_PCI_BRIDGE_EMUL (not configurable)

modulename: pci-bridge-emul.ko

configname: CONFIG_PCI_BRIDGE_EMUL

Linux Kernel Configuration
└─>Bus options (PCI etc.)
└─>PCI_BRIDGE_EMUL
In linux kernel since version 4.2 (release Date: 2015-08-30)  
source code:
drivers/pci/pci-bridge-emul.c