UPSTREAM: drm/virtio: implement context init: allocate an array of fence contexts

We don't want fences from different 3D contexts (virgl, gfxstream,
venus) to be on the same timeline.  With explicit context creation,
we can specify the number of ring each context wants.

Execbuffer can specify which ring to use.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Acked-by: Lingfeng Yang <lfy@google.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210921232024.817-10-gurchetansingh@chromium.org


Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 85c83ea9)

BUG=b:176158390, b:203009046, b:230100768
TEST=gfxbench and deqp-cts in arcvm

Signed-off-by: Rob Clark <robdclark@chromium.org>
Change-Id: Iccc0835f2a6af312da439a0a407810aeb2f2b2c1
Disallow-Recycled-Builds: test-failures
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3469488


Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Chia-I Wu <olv@google.com>
Reviewed-by: Ryan Neph <ryanneph@google.com>