Dear Jason Gunthorpe, On Mon, 28 Jan 2013 15:51:05 -0700, Jason Gunthorpe wrote: > > > I'm refering to your earlier question about what PCI IDs to use for > > > the SW emulated devices. If there is no need for the host bridge then > > > you only need 1 PCI ID (for the root port bridge) and you can probably > > > fairly safely re-use the one in the Marvell config space of the HW. > > > > Ah, ok, I see. But isn't a host bridge needed to bind all the > > PCI-to-PCI bridges under a single bus, in order to get the global > > resource assignment I was referring to? > > The PCI-E spec requires it, but AFAIK it doesn't actually *do* > anything on Linux, and Linux doesn't require it. > > I thought Thierry did this experiment and decided it wasn't necessary: Could you detail what would be visible PCI bus topology if I remove the emulated PCI host bridge? (And keeping one PCI-to-PCI bridge per PCIe interface) ? I'm just trying to understand what it would look like, in terms of "lspci -t" output, because for now, it's not clear to me how everything would fit together with the emulated host bridge. Thanks, Thomas -- Thomas Petazzoni, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- 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
