MSI-HOWTO.txt - the Message Signaled Interrupts (MSI) Driver Guide HOWTO and FAQ.
PCIEBUS-HOWTO.txt - a guide describing the PCI Express Port Bus driver
pci-error-recovery.txt - info on PCI error recovery
pci-iov-howto.txt - the PCI Express I/O Virtualization HOWTO
pci.txt - info on the PCI subsystem for device driver authors
pcieaer-howto.txt - the PCI Express Advanced Error Reporting Driver Guide HOWTO.