[Bug 97872] GPU hang with libva (gstreamer)

[bugzilla-daemon at freedesktop.org]

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

--- Comment #16 from haihao <haihao.xiang at intel.com> ---
(In reply to Sean V Kelley from comment #13)
> Haihao,
> 
> The 2nd VDBOX on SKL is not a complete VDBOX, it only contains MFX. I would
> recommend shunting all MFX workloads to the 2nd VDBOX and using the 1st
> VDBOX for HCP, VDENC, HuC.

Usually user doesn't use different codecs at the same time. I don't think using
BSD1 only for MFX is better choice for VP8/H264/MPEG2 etc.

> What we need for a permanent fix is an i915
> kernel patch that manages the loads between the engines based on input from
> UMD.

Currently i915 kernel can manage the loads between the engines.  But i915
kernel doesn't know HCP/HuC commands must be ran from the 2nd ring unless UMD
driver can tell the kernel. which is why I915_EXEC_BSD_RING1 and
I915_EXEC_BSD_RING2 are added to the execution ioctl.

> 
> So, while I find you patch servicable for the immediate need, I want to see
> a long term fix along the lines above that I suggest.  I will look into the
> kernel patch.
> 
> Thanks,
> 
> Sean

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