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SubjectRe: [RFC Patch] use MTRR for write combining if PAT is not available
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On Thu, 2009-10-22 at 18:53 -0700, Eric Anholt wrote:
> On Thu, 2009-10-22 at 17:11 -0700, Suresh Siddha wrote:
> > On Thu, 2009-10-22 at 16:10 -0700, Jesse Barnes wrote:
> > > On Thu, 22 Oct 2009 14:47:30 -0700
> > > Suresh Siddha <suresh.b.siddha@intel.com> wrote:
> > >
> > > > On Thu, 2009-10-22 at 08:34 -0700, Eric Anholt wrote:
> > > > > Can we just not create the _wc sysfs entry if we don't have PAT? I
> > > > > don't think there's userland relying on its presence as opposed to
> > > > > the non-_wc entry.
> > > >
> > > > Yes indeed. Jesse do you see an issue with this? This is simple and
> > > > clean. Thanks Eric.
> > >
> > > Yeah, I think that will be fine. In fact, older versions of
> > > libpciaccess will behave better if we do it that way (iirc it only
> > > allocates an MTRR if the resource_wc file doesn't exist or fails to get
> > > mapped).
> >
> > Eric, care to send the patch?
>
> I don't have a patch, I was just suggesting a way to handle the
> submitter's problem that won't involve complicated changes that nobody
> else will be testing since everyone *should* have a graphics driver for
> their graphics hardware.

I can send the patch early next week unless Thomas or someone else beats
me.



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