Avoid charging us for the presumed busywait if the request was preempted
after successfully using semaphores to reduce inter-engine latency.
v2: Bump the priority to reflect the lack of semaphores now required.
References: ca6e56f654e7 ("drm/i915: Disable semaphore busywaits on saturated
systems")
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
drivers/gpu/drm/i915/i915_request.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_request.c
b/drivers/gpu/drm/i915/i915_request.c
index bed213148cbb..11670774cd25 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -509,6 +509,12 @@ 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.attr.priority |= I915_PRIORITY_NOSEMAPHORE;
+ 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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