[Intel-gfx] [PATCH 16/21] drm/i915/gem: Delay context creation

[Jason Ekstrand]

On Thu, Apr 29, 2021 at 2:07 PM Daniel Vetter <daniel at ffwll.ch> wrote:
>
> On Thu, Apr 29, 2021 at 02:01:16PM -0500, Jason Ekstrand wrote:
> > On Thu, Apr 29, 2021 at 1:56 PM Daniel Vetter <daniel at ffwll.ch> wrote:
> > > On Thu, Apr 29, 2021 at 01:16:04PM -0500, Jason Ekstrand wrote:
> > > > On Thu, Apr 29, 2021 at 10:51 AM Daniel Vetter <daniel at ffwll.ch> wrote:
> > > > > > +     ret = set_proto_ctx_param(file_priv, pc, args);
> > > > >
> > > > > I think we should have a FIXME here of not allowing this on some future
> > > > > platforms because just use CTX_CREATE_EXT.
> > > >
> > > > Done.
> > > >
> > > > > > +     if (ret == -ENOTSUPP) {
> > > > > > +             /* Some params, specifically SSEU, can only be set on fully
> > > > >
> > > > > I think this needs a FIXME: that this only holds during the conversion?
> > > > > Otherwise we kinda have a bit a problem me thinks ...
> > > >
> > > > I'm not sure what you mean by that.
> > >
> > > Well I'm at least assuming that we wont have this case anymore, i.e.
> > > there's only two kinds of parameters:
> > > - those which are valid only on proto context
> > > - those which are valid on both (like priority)
> > >
> > > This SSEU thing looks like a 3rd parameter, which is only valid on
> > > finalized context. That feels all kinds of wrong. Will it stay? If yes
> > > *ugh* and why?
> >
> > Because I was being lazy.  The SSEU stuff is a fairly complex param to
> > parse and it's always set live.  I can factor out the SSEU parsing
> > code if you want and it shouldn't be too bad in the end.
>
> Yeah I think the special case here is a bit too jarring.

I rolled a v5 that allows you to set SSEU as a create param.  I'm not
a huge fan of that much code duplication for the SSEU set but I guess
that's what we get for deciding to "unify" our context creation
parameter path with our on-the-fly parameter path....

You can look at it here:

https://gitlab.freedesktop.org/jekstrand/linux/-/commit/c805f424a3374b2de405b7fc651eab551df2cdaf#474deb1194892a272db022ff175872d42004dfda_283_588

I'm also going to send it to trybot.

--Jason