[Intel-gfx] [PATCH] drm/i915: Add relocation exceptions for two other platforms

[Daniel Vetter]

On Wed, May 26, 2021 at 10:35:49AM +1000, Dave Airlie wrote:
> On Wed, 12 May 2021 at 03:05, Daniel Vetter <daniel at ffwll.ch> wrote:
> > On Tue, May 11, 2021 at 10:31:39AM +0200, Zbigniew Kempczyński wrote:
> > > We have established previously we stop using relocations starting
> > > from gen12 platforms with Tigerlake as an exception. Unfortunately
> > > we need extend transition period and support relocations for two
> > > other igfx platforms - Rocketlake and Alderlake.
> > >
> > > Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
> > > Cc: Dave Airlie <airlied at redhat.com>
> > > Cc: Daniel Vetter <daniel.vetter at intel.com>
> > > Cc: Jason Ekstrand <jason at jlekstrand.net>
> >
> > So the annoying thing here is that now media-driver is fixed:
> >
> > https://github.com/intel/media-driver/commit/144020c37770083974bedf59902b70b8f444c799
> >
> > Which means igt is really the only thing left.
> >
> > Dave, is this still ok for an acked exception, or is this now leaning
> > towards "just fix igt"?
> 
> Oh that isn't great is it, I had thought it was the media-driver,
> keeping a big uAPI like this open just for the test code seems a bit
> silly. I get the tests are testing more than just relocs, but it's a
> pretty big interface to leave lying around if we can avoid it.

So since we need to do the work anyway for DG1+ what about some interim
hack? Currently ADL still has the require_force_probe flag set. We could
re-enable relocations just for ADL, only while this flag is set. This
gives us a bunch of wiggle room, unblocks everything else (CI is a bit on
fire right now due to this and practially unuseable on ADL gem areay) and
we'll still make sure that when ADL is all done we wont expose relocations
just for igt.

Thoughts?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch