On 05/30/2012 09:27 AM, Bjorn Helgaas wrote: > > You're right, the spec does allow the upper 16 bits of I/O BARs to be > hardwired to zero (PCI spec rev 3.0, p. 226), so this part does make > some sense. I don't think it applies to x86, since I don't think > there's a way to generate an I/O access to anything above 64K, but it > could help other arches. > > I'm inclined to be conservative and wait until we find a problem where > a patch like this would help. > The really conservative thing is to just use 16-bit addresses for I/O on all platforms. I think a lot of non-x86 platforms does that. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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
