linux-kernel - Re: [Nouveau] [Intel-gfx] [PATCH v6 08/17] drm/ttm: use gem vma

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Date:   Sat, 7 Sep 2019 21:58:46 -0400
From:   Ilia Mirkin <imirkin@...m.mit.edu>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Ben Skeggs <skeggsb@...il.com>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        ML nouveau <nouveau@...ts.freedesktop.org>,
        intel-gfx <intel-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx mailing list <amd-gfx@...ts.freedesktop.org>,
        linux-graphics-maintainer@...are.com,
        Gerd Hoffmann <kraxel@...hat.com>,
        spice-devel@...ts.freedesktop.org, Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [Nouveau] [Intel-gfx] [PATCH v6 08/17] drm/ttm: use gem vma_node

On Wed, Aug 21, 2019 at 7:55 AM Thierry Reding <thierry.reding@...il.com> wrote:
>
> On Wed, Aug 21, 2019 at 04:33:58PM +1000, Ben Skeggs wrote:
> > On Wed, 14 Aug 2019 at 20:14, Gerd Hoffmann <kraxel@...hat.com> wrote:
> > >
> > >   Hi,
> > >
> > > > > Changing the order doesn't look hard.  Patch attached (untested, have no
> > > > > test hardware).  But maybe I missed some detail ...
> > > >
> > > > I came up with something very similar by splitting up nouveau_bo_new()
> > > > into allocation and initialization steps, so that when necessary the GEM
> > > > object can be initialized in between. I think that's slightly more
> > > > flexible and easier to understand than a boolean flag.
> > >
> > > Yes, that should work too.
> > >
> > > Acked-by: Gerd Hoffmann <kraxel@...hat.com>
> > Acked-by: Ben Skeggs <bskeggs@...hat.com>
>
> Thanks guys, applied to drm-misc-next.

Hi Thierry,

Initial investigations suggest that this commit currently in drm-next

commit 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5
Author: Thierry Reding <treding@...dia.com>
Date:   Wed Aug 14 11:00:48 2019 +0200

    drm/nouveau: Initialize GEM object before TTM object

breaks nouveau userspace which tries to allocate GEM objects with a
non-page-aligned size. Previously nouveau_gem_new would just call
nouveau_bo_init which would call nouveau_bo_fixup_align before
initializing the GEM object. With this change, it is done after. What
do you think -- OK to just move that bit of logic into the new
nouveau_bo_alloc() (and make size/align be pointers so that they can
be fixed up?)

Cheers,

  -ilia