Messages in this thread | | | Subject | Re: [RFC Patch] use MTRR for write combining if PAT is not available | From | Suresh Siddha <> | Date | Thu, 22 Oct 2009 21:33:21 -0700 |
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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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