Mesa update as SRU?

[Timo Aaltonen]

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On 11.04.2014 08:31, Steve Langasek wrote:
> On Thu, Apr 10, 2014 at 10:33:41PM +0300, Timo Aaltonen wrote:
>>>> This would allow a more sane way to provide BDW support in 
>>>> 14.04.1 than backporting a big pile of commits and
>>>> maintaining the franken-mesa ourselves..
> 
>>> Is 14.04.1 the right time frame to be targetting Broadwell
>>> support, or should we be aiming for 14.04.2 instead?  I.e.,
>>> would this fit better the normal point release hardware
>>> enablement stack process?
> 
>> I'm afraid 14.04.2 is too late for the first batch of devices to
>> be shipped by our OEM partners "before EOY".. (being vague on
>> purpose, the release schedules aren't public yet AIUI). That's
>> also why the trusty kernel has a i915_bdw module backported from
>> 3.14+fixes. Attempting the same for mesa is unknown territory
>> though, kernel is easy in that regard.
> 
> OK.  I realize that trying to backport all the pieces onto mesa is
> not necessarily less risky than taking the new upstream version;
> but that just makes me worry that neither is appropriate for an
> SRU.  Have you considered the possibility of an early "pre-release"
> version of the enablement stack, made available to OEMs that will
> ship before EOY, and automatically updated to the official 14.04.2
> enablement stack once it's out?

Well, the deadlines are pretty aggressive.. that said, I got a patch
from upstream before weekend that fixed the blocker bug running Unity
on BDW*. Our driver test suite ran fine too, though some piglit tests
obviously failed (due to missing features from the DRI driver) but
didn't hang the machine or anything.

So, I'm proposing to add this patch and the commit to enable BDW on
i965_dri.so before the release, and we can then backport further fixes
as SRU on a case-by-case basis? Might be that it's unnecessary to
backport any massive features for 14.04.1 (HiZ, MSAA were the bulk of
the preliminary backport work). I've requested to backport bugfixes to
the stable queue for mesa 10.1.x, we'll see how that goes.


* https://bugs.freedesktop.org/show_bug.cgi?id=75879

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t
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