Debugging tools/approach for GPU hangs?

Matt Zimmerman mdz at
Wed Sep 23 23:28:54 BST 2009

On Wed, Sep 23, 2009 at 01:27:09PM -0700, Jesse Barnes wrote:
> On Tue, 22 Sep 2009 09:41:45 -0700
> Matt Zimmerman <mdz at> wrote:
> > I had a look at this recently and couldn't quite figure out how to
> > match the uevent.  The relevant code seems to be in
> > drivers/gpu/drm/i915/i915_irq.c:i915_capture_error_state et al, but
> > it's not obvious how to match that kobject in a udev rule.  Can you
> > give me a hint?
> You should get a uevent from the i915 drm device (udevadm will show
> hotplug events when you plug/unplug VGA; you can use them as an
> example).
> You'll get three events, one when the error is detected, one before the
> reset and one after.  Each has a different environment variable set;
> the initial error has ERROR=1, the pre-reset event has RESET=1 and the
> post-reset event has ERROR=0.
> Does that help?

Yes, that's exactly what I was looking for, thanks.

I assume we should get the dump after the error and before the reset?

 - mdz

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