On Fri, Jun 30, 2017 at 10:16:15AM -0700, Linus Torvalds wrote: > On Fri, Jun 30, 2017 at 7:30 AM, Thomas Gleixner <t...@linutronix.de> wrote: > >> But MCFG problems were a long time ago and noone uses these systems > >> anymore, > >> so perhaps he is right. > > > > The obvious solution to this is to force type 1 for older machines, i.e. <= > > K8. Some day we should stop supporting 15+ years old crap just because we > > can. > > No. > > The fact is, type 1 is the *good* thing. It's the standard thing that > has worked pretty much forever, and that is not just tested, but has > good semantics.
Fully agreed. Also, config space accesses supposed to be *safe* rather than *fast*. There was quite a heated discussion on this very subject back in 2008. Thought that I have a full copy of that, but no, surprisingly... Google still gives a sufficient part of that: http://linux-kernel.2935.n7.nabble.com/Patch-v2-Make-PCI-extended-config-space-MMCONFIG-a-driver-opt-in-td243861i60.html Ivan.
