Avoid the full blown memory barrier of test_and_set_bit() by noting the
completed request and removing it from the lists.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_request.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 4d886b3c9cd7..2a2ec95fed5f 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -538,8 +538,10 @@ bool __i915_request_submit(struct i915_request *request)
* dropped upon retiring. (Otherwise if resubmit a *retired*
* request, this would be a horrible use-after-free.)
*/
- if (i915_request_completed(request))
- goto xfer;
+ if (i915_request_completed(request)) {
+ list_del_init(&request->sched.link);
+ goto active;
+ }
if (unlikely(intel_context_is_closed(request->context) &&
!intel_engine_has_heartbeat(engine)))
@@ -578,11 +580,11 @@ bool __i915_request_submit(struct i915_request *request)
engine->serial++;
result = true;
-xfer:
- if (!test_and_set_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags)) {
- list_move_tail(&request->sched.link, &engine->active.requests);
- clear_bit(I915_FENCE_FLAG_PQUEUE, &request->fence.flags);
- }
+ GEM_BUG_ON(test_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags));
+ list_move_tail(&request->sched.link, &engine->active.requests);
+active:
+ clear_bit(I915_FENCE_FLAG_PQUEUE, &request->fence.flags);
+ set_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags);
/*
* XXX Rollback bonded-execution on __i915_request_unsubmit()?
--
2.20.1
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