Re: Notes from LPC PCI/MSI BoF session

[Matthew Wilcox <matthew@wil.cx>]

On Mon, Sep 22, 2008 at 12:29:18PM -0700, Jesse Barnes wrote:
> PCI address space management
> ----------------------------
> TJ has a bunch of code to improve address space management in Linux.  We 
> talked for a few minutes about this at the BoF; at this point I'm just 
> waiting for TJ to post his stuff so we can start integrating it.  Hopefully 
> we can start merging small pieces of it (like the multiple PCI gap stuff) for 
> 2.6.28, and get some more eyes on the more aggressive PCI-DMAR stuff he's 
> been talking about soon.
> 
> Well that's all I have in the way of notes.  Feel free to add your own if I 
> missed anything or correct me if I mischaracterized things.

One thing that wasn't resolved at the meeting was the question of 64-bit
addressing and PCI-PCI bridges (primarily because nobody had their
PCI-SIG login with them).  I've now downloaded the latest PCI-PCI Bridge
spec and there are still no facilities to forward addresses >4GB (other
than the prefetchable region that was already in PPB 1.1).

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."