On Wed, Apr 08, 2009 at 03:53:55PM -0500, Kumar Gala wrote: > I was wondering if we have anything that tracks regions associated with > the "inbound" side of a pci_bus. > > What I mean is on embedded PPC we have window/mapping registers for both > inbound (accessing memory on the SoC) and outbound (access PCI device > MMIO, IO etc). The combination of the inbound & outbound convey what > exists in the PCI address space vs CPU physical address space (and how to > map from one to the other). Today in the PPC land we only attach > outbound windows to the pci_bus. So technically the inbound side > information (like what subset of physical memory is visible on the PCI > bus) seems to be lost. > To the best of my knowledge there is no API to set inbound windows in Linux. I've been implementing a virtio-over-PCI driver which needs the inbound windows. I set them up myself during driver probe, using get_immrbase() to get the IMMR registers. This board is a PCI Slave / Agent, it doesn't even have PCI support compiled into the kernel. Ira -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
