Re: Tegra PCIe system hangs

[Thierry Reding <thierry.reding@gmail.com>]

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On Mon, Aug 26, 2013 at 01:50:34AM +0200, Lucas Stach wrote:
> Ok, turn out this seems to be an issue with legacy PCI interrupts.
> Nouveau wasn't really using MSI interrupts, switching them on seems to
> fix the stability issue.
> 
> Still I would be interested in the root cause and would like to see this
> documented somewhere.

Hi Lucas,

Thanks for reporting. It's quite possible that there is a general issue
with legacy interrupts since I haven't tested that much. I'll see if I
can reproduce the lockups when using legacy interrupts on any of my
setups.

Thanks,
Thierry

> 
> Thanks,
> Lucas
> 
> Am Sonntag, den 25.08.2013, 19:14 +0200 schrieb Lucas Stach:
> > Hi all,
> > 
> > I've been experimenting with the Nouveau driver on Tegra for a few days
> > now and made some promising progress. The one thing that keeps throwing
> > me back is that I get seemingly random system lockups, which are not
> > recoverable.
> > 
> > I think this could be the same issue that was reported by Jay Agarwal
> > earlier. (Message-id:
> > <C79B248886DD134989C8FF6B096A91AB91B603D82B@BGMAIL01.nvidia.com>)
> > I also found a WAR for a system hang issue in the NVidia downstream
> > kernel [1], but when tried on upstream it had no effect on the issue.
> > 
> > I'm reasonably sure that this is not driver software related, as I've
> > already hunted down most of the caching issues and acceleration seems to
> > work at this point. So either this is a random HW hang, or there is some
> > software condition I'm not aware of.
> > 
> > I'm running a NV92 connected to the NVidia Beaver board. Kernel is
> > next-20130809 with the PCIe series + the LP2 workaround applied.
> > 
> > Could you please investigate if there are any other known errata for the
> > Tegra PCIe controller, which could hang the entire system?
> > 
> > Thanks,
> > Lucas
> > 
> > [1]
> > http://nv-tegra.nvidia.com/gitweb/?p=linux-2.6.git;a=blobdiff;f=arch/arm/mach-tegra/pcie.c;h=9fab5de016cfd3cd2ebd8176da5bdbedfac73cd8;hp=44749685e2bf822665c9345aec45151b8d2447c4;hb=c5d1bcfb7249b291453a80122148155a00e5456a;hpb=704125ef90e12bc41de057001cc96d81d7cc0376
> > 
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> 

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