Today, pci_mapreg_map(9) on x86 will try to create a BUS_SPACE_MAP_PREFETCHABLE mapping[1] of a prefetchable BAR no matter whether BUS_SPACE_MAP_PREFETCHABLE was passed to pci_mapreg_map(9) or not.
A less surprising behavior would be for pci_mapreg_map(9) to create a BUS_SPACE_MAP_PREFETCHABLE mapping of a prefetchable BAR only if BUS_SPACE_MAP_PREFETCHABLE was passed, and to fail if BUS_SPACE_MAP_PREFETCHABLE was *not* passed but the region's behavior is intrinsically prefetchable. Thoughts? BTW, the reason this comes up is that I am working with some 10Gbe NICs whose BARs' prefetchable bits are set due to a manufacturer mistake. I have worked around this in the same way that if_fxp_pci.c has, but I think that the pci(9) code should be a bit less (more?) "helpful" than it is. Dave [1] On x86 the BAR is mapped with write-combining. -- David Young OJC Technologies [email protected] Urbana, IL * (217) 344-0444 x24
