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

[Mark Janes]

Francisco Jerez <currojerez at riseup.net> writes:

> Mark Janes <mark.a.janes at intel.com> writes:
>
>> 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.
>>
>> I wasn't aware of the regression.
>
> Check your IRC logs from when you proposed me to do this last
> Wednesday. ;)

Yes, it's my fault.  I didn't parse what you were saying carefully
enough.

>> For reference:
>>
>> https://bugs.freedesktop.org/show_bug.cgi?id=93540
>> https://bugs.freedesktop.org/show_bug.cgi?id=93599
>>
>>> 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.
>>
>> I doubt the Chrome team would want to ship their product with this
>> issue.
>>
> Sure, that's why I pointed Kalyan at the bugfix too in case they want to
> go down this road.
>
>>> --Ken
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