Xavier pcie

Tn the guide of the NVIDIA JETSON AGX XAVIER PCIE ENDPOINT SOFTWARE FOR L4T. I have some problems.

I create the fun1 under /sys/kernel/config/pci_ep/functions/pci_epf_nv_test/, the vendorid and deviceid will be appeared, but the /sys/kernel/config/pci_ep/controllers if null, no foler 141a0000.pcie_ep under controllers.

when I buid /sys/kernel/config/pci_ep/controllers/141a0000.pcie_ep,I can’t do this because I don’t have permission.

what can i do to have /sys/kernel/config/pci_ep/controllers/141a0000.pcie_ep?