tree 12a465dab8256f388519f0cdd73bdc8e0889b410
parent 77ae9957897df86e627089688265e0db029dd0df
author Chris Wilson <chris@chris-wilson.co.uk> 1485510008 +0000
committer Chris Wilson <chris@chris-wilson.co.uk> 1485546948 +0000

drm/i915: Support explicit fencing for execbuf

Now that the user can opt-out of implicit fencing, we need to give them
back control over the fencing. We employ sync_file to wrap our
drm_i915_gem_request and provide an fd that userspace can merge with
other sync_file fds and pass back to the kernel to wait upon before
future execution.

Testcase: igt/gem_exec_fence
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Chad Versace <chadversary@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170127094008.27489-2-chris@chris-wilson.co.uk