[Bug 63921] [snb] GTT mapping fails after GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63921

Mika Kuoppala <mika.kuoppala at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #53 from Mika Kuoppala <mika.kuoppala at intel.com> ---
(In reply to comment #52)
> (In reply to comment #51)
> > (In reply to comment #49)
> > > (In reply to comment #48)
> > > > Created attachment 79420 [details] [review] [review] [review] [review]
> > > > Patch to get error state out on low/fragmented memory situations
> > > 
> > > Patch doesn't apply cleanly to 3.9.2 (error at the end of message). Do you
> > > prefer if I try to backport or start using another kernel?
> > 
> > I have attached a proper patch to get error state out even if
> > memory is fragmented, backported to 3.9.2.
> > 
> > Patch is also included in:
> > http://cgit.freedesktop.org/~danvet/drm-intel/log/?h=drm-intel-next-queued
> > 
> > Nicolas, could you please try the patch so that we could get
> > an error state for this bug. Thanks.
> 
> Mika, I had already more or less backported the patch to 3.9.3 (see the
> other bug report: https://bugs.freedesktop.org/show_bug.cgi?id=63946). Now
> I'm having difficulties getting it to crash without locking hard. Often it
> doesn't crash but lowers its output frequency as I explain in that bug
> report (which is for the same bug). I'm trying out on a lot of units todays
> so hopefully I strike gold! I'll keep you guys posted. Thanks for the
> correct backport.

Nicolas, it is not a backport of the previous patch in this bug (it was vmalloc
hack). The newly attached patch avoids seq_file completely and should work in
very low memory and/or fragmented situations also.

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