[Mesa-stable] Backport L3 cache control patches to 11.1

[Francisco Jerez]

Kenneth Graunke <kenneth at whitecape.org> writes:

> On Thursday, January 14, 2016 4:50:17 PM PST Mark Janes wrote:
>> Changes to the L3 configuration by non-mesa (eg, media) programs
>> interfere with mesa.  This affects media playback in ChromeOS.
>> 
>> Luckily, Curro made Mesa L3-aware in preparation for compute shaders.
>> His patches resolve media playback issues in ChromeOS.
>> 
>> Please backport the following commits to 11.1:
>
> I disagree, we should not backport these to Mesa stable releases.
>
> They are risky, have known regressions, and actually only work around
> bugs in other projects.
>
> libva needs to use a hardware context to protect itself from other
> userspace processes.  The kernel needs to initialize L3 as part of
> the golden context (the default state of new contexts).
>
> The Chrome team is welcome to carry patches with known caveats if
> they want, but I'm not comfortable shipping this upstream.
>

Yeah, I wouldn't be comfortable with shipping a Mesa release with those
patches in but without the following bug-fix patches applied on top:

http://lists.freedesktop.org/archives/mesa-dev/2016-January/104968.html
http://lists.freedesktop.org/archives/mesa-dev/2016-January/104969.html

> --Ken
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