[PATCH 4/4] drm/doc/rfc: Mark GPU VA as complete.

[Rodrigo Vivi]

On Mon, Sep 04, 2023 at 11:39:55PM +0200, Danilo Krummrich wrote:
> On 8/31/23 21:17, Rodrigo Vivi wrote:
> > On Tue, Aug 29, 2023 at 12:30:04PM -0400, Rodrigo Vivi wrote:
> > > Nouveau has landed the GPU VA helpers, support and documentation
> > > already and Xe is already using the upstream GPU VA.
> > 
> > Danilo, although this is more on the Xe side and I wouldn't ask you
> > to review our code entirely, I'd like to get your ack here as Daniel
> > recommended. Meaning that we are aligned there and not creating any
> > change on top of GPU VA. Xe is currently using GPU VA directly without
> > any customization.
> > 
> > Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/commit/ea4ae69e66b2940107e74f240ecb9dae87bf1ff1
> > Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/commits/drm-xe-next?ref_type=heads
> 
> Acked-by: Danilo Krummrich <dakr at redhat.com>
> 
> Just one note: If we end up to agree on [1] few more adjustments are needed.

Thanks. I see Thomas is already engaged there and I believe it will be easier
to change that and align when we are merged. Since that appears to not
break any uapi.

> 
> Otherwise, same as the other commit, where is the paragraph going?

to the new
+Xe – Pre-Merge Goals - Completed
+================================
https://lore.kernel.org/all/20230829163005.54067-2-rodrigo.vivi@intel.com/

> 
> - Danilo
> 
> [1] https://lore.kernel.org/dri-devel/202308221050.kTj8uFMA-lkp@intel.com/T/#m7f3b5a7ff70723332adeea32671578cb95c62f7c
> 
> > 
> > > 
> > > Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > > ---
> > >   Documentation/gpu/rfc/xe.rst | 36 ++++++++++++++++++------------------
> > >   1 file changed, 18 insertions(+), 18 deletions(-)
> > > 
> > > diff --git a/Documentation/gpu/rfc/xe.rst b/Documentation/gpu/rfc/xe.rst
> > > index a115526c03e0..b67f8e6a1825 100644
> > > --- a/Documentation/gpu/rfc/xe.rst
> > > +++ b/Documentation/gpu/rfc/xe.rst
> > > @@ -88,24 +88,6 @@ depend on any other patch touching drm_scheduler itself that was not yet merged
> > >   through drm-misc. This, by itself, already includes the reach of an agreement for
> > >   uniform 1 to 1 relationship implementation / usage across drivers.
> > > -GPU VA
> > > -------
> > > -Two main goals of Xe are meeting together here:
> > > -
> > > -1) Have an uAPI that aligns with modern UMD needs.
> > > -
> > > -2) Early upstream engagement.
> > > -
> > > -RedHat engineers working on Nouveau proposed a new DRM feature to handle keeping
> > > -track of GPU virtual address mappings. This is still not merged upstream, but
> > > -this aligns very well with our goals and with our VM_BIND. The engagement with
> > > -upstream and the port of Xe towards GPUVA is already ongoing.
> > > -
> > > -As a key measurable result, Xe needs to be aligned with the GPU VA and working in
> > > -our tree. Missing Nouveau patches should *not* block Xe and any needed GPUVA
> > > -related patch should be independent and present on dri-devel or acked by
> > > -maintainers to go along with the first Xe pull request towards drm-next.
> > > -
> > >   ASYNC VM_BIND
> > >   -------------
> > >   Although having a common DRM level IOCTL for VM_BIND is not a requirement to get
> > > @@ -230,3 +212,21 @@ Xe merged, it is mandatory to enforce the overall locking scheme for all major
> > >   structs and list (so vm and vma). So, a consensus is needed, and possibly some
> > >   common helpers. If helpers are needed, they should be also documented in this
> > >   document.
> > > +
> > > +GPU VA
> > > +------
> > > +Two main goals of Xe are meeting together here:
> > > +
> > > +1) Have an uAPI that aligns with modern UMD needs.
> > > +
> > > +2) Early upstream engagement.
> > > +
> > > +RedHat engineers working on Nouveau proposed a new DRM feature to handle keeping
> > > +track of GPU virtual address mappings. This is still not merged upstream, but
> > > +this aligns very well with our goals and with our VM_BIND. The engagement with
> > > +upstream and the port of Xe towards GPUVA is already ongoing.
> > > +
> > > +As a key measurable result, Xe needs to be aligned with the GPU VA and working in
> > > +our tree. Missing Nouveau patches should *not* block Xe and any needed GPUVA
> > > +related patch should be independent and present on dri-devel or acked by
> > > +maintainers to go along with the first Xe pull request towards drm-next.
> > > -- 
> > > 2.41.0
> > > 
> > 
>