Avoid charging us for the presumed busywait if the request was preempted
after successfully using semaphores to reduce inter-engine latency.
References: ca6e56f654e7 ("drm/i915: Disable semaphore busywaits on saturated systems")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_request.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index bed213148cbb..4e6a7f37fffc 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -509,6 +509,10 @@ void __i915_request_unsubmit(struct i915_request *request)
/* Transfer back from the global per-engine timeline to per-context */
move_to_timeline(request, request->timeline);
+ /* We've already spun, don't charge on resubmitting. */
+ if (request->sched.semaphores && i915_request_started(request))
+ request->sched.semaphores = 0;
+
/*
* We don't need to wake_up any waiters on request->execute, they
* will get woken by any other event or us re-adding this request
--
2.20.1
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