pcimodules command, part of pciutils package, lists all the loaded modules corresponding to the PCI devices found and detected by the kernel. pcimodules needs the modules.pcimap file to run successfully. If missing, then you have to recreate it manually :

fool@localhost:~$ pcimodules
/lib/modules/3.0.0-1-686-pae/modules.pcimap: No such file or directory

root@localhost:~#depmod -m

root@localhost:~# ls -l /lib/modules/3.0.0-1-686-pae/modules.pcimap

-rw-r–r– 1 root root 441540 Sep 26 21:19 /lib/modules/3.0.0-1-686-pae/modules.pcimap