On Thu, Jan 10, 2013 at 08:03:27PM +0100, Thierry Reding wrote: > > > You'd piece a mapping together, each bus requires 16 64k mappings, a > > > simple 2d array of busnr*16 of pointers would do the trick. A more > > > clever solution would be to allocate contiguous virtual memory and > > > split that up.. > > Oh, I see. I'm not very familiar with the internals of remapping, so > > I'll need to do some more reading. Thanks for the hints. > > I forgot to ask. What's the advantage of having a contiguous virtual > memory area and splitting it up versus remapping each chunk separately? Not alot, really, but it saves you from the pointer array and associated overhead. IIRC it is fairly easy to do in the kernel. Arnd's version is good too, but you would be restricted to aligned powers of two for the bus number range in the DT, which is probably not that big a deal either? Jason -- 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
