[Bug 97872] GPU hang with libva (gstreamer)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97872

--- Comment #24 from Sean V Kelley <seanvk at posteo.de> ---
(In reply to haihao from comment #20)
> > Yes, that is the whole point of the patch submitted to the i915, but it is
> > still a hack.  I’m well aware of how this works.  And that means every time
> > we use a new codec that is not balanced between the VDBoxen we add the hack
> > flag.  Again, we need to do better.
> > 
> 
> The batchbuffer for a new codec (MPEG2/JPEG/VC1/AVC/VP8) is still balanced
> between all VCS/VDBOX rings. The flag in the following function call is only
> available to the current batch buffer. 
> 
> intel_batchbuffer_start_atomic_bcs_override(batch, 0x1000, BSD_RING0);

Yes, I'm aware of that my point is that it is not "balanced" at all from a
performance stand point.  And that is the kernel work I'm describing. 
Regardless, that will not impact the immediate fix on this bug.

But I need you to test with KBL GT3+ for HCP based codecs.  Once we have VDENC
AVC in place that too will need to be tested.

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