[Nouveau] [PATCH v4] pci: prevent putting nvidia GPUs into lower device states on certain intel bridges

[Lyude Paul]

On Wed, 2019-11-27 at 12:51 +0100, Karol Herbst wrote:
> On Wed, Nov 27, 2019 at 12:49 PM Mika Westerberg
> <mika.westerberg at intel.com> wrote:
> > On Tue, Nov 26, 2019 at 06:10:36PM -0500, Lyude Paul wrote:
> > > Hey-this is almost certainly not the right place in this thread to
> > > respond,
> > > but this thread has gotten so deep evolution can't push the subject
> > > further to
> > > the right, heh. So I'll just respond here.
> > 
> > :)
> > 
> > > I've been following this and helping out Karol with testing here and
> > > there.
> > > They had me test Bjorn's PCI branch on the X1 Extreme 2nd generation,
> > > which
> > > has a turing GPU and 8086:1901 PCI bridge.
> > > 
> > > I was about to say "the patch fixed things, hooray!" but it seems that
> > > after
> > > trying runtime suspend/resume a couple times things fall apart again:
> > 
> > You mean $subject patch, no?
> > 
> 
> no, I told Lyude to test the pci/pm branch as the runpm errors we saw
> on that machine looked different. Some BAR error the GPU reported
> after it got resumed, so I was wondering if the delays were helping
> with that. But after some cycles it still caused the same issue, that
> the GPU disappeared. Later testing also showed that my patch also
> didn't seem to help with this error sadly :/
> 
> > > [  686.883247] nouveau 0000:01:00.0: DRM: suspending object tree...
> > > [  752.866484] ACPI Error: Aborting method \_SB.PCI0.PEG0.PEGP.NVPO due
> > > to previous error (AE_AML_LOOP_TIMEOUT) (20190816/psparse-529)
> > > [  752.866508] ACPI Error: Aborting method \_SB.PCI0.PGON due to
> > > previous error (AE_AML_LOOP_TIMEOUT) (20190816/psparse-529)
> > > [  752.866521] ACPI Error: Aborting method \_SB.PCI0.PEG0.PG00._ON due
> > > to previous error (AE_AML_LOOP_TIMEOUT) (20190816/psparse-529)
> > 
> > This is probably the culprit. The same AML code fails to properly turn
> > on the device.
> > 
> > Is acpidump from this system available somewhere?

Attached it to this email

> > 
-- 
Cheers,
	Lyude Paul
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