[Intel-gfx] [PATCH i-g-t] i915/perf_pmu: Update inter-engine semaphore detection

Chris Wilson chris at chris-wilson.co.uk
Tue May 26 14:17:23 UTC 2020

The kernel no longer uses semaphores between engines, unless it can do
so by preempting them with timeslices. Update the semaphore-busy to only
run when we expect semaphore usage, i.e. not on bdw/bsw.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1939
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
 tests/perf_pmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
index e54a0d47e..e80f730cf 100644
--- a/tests/perf_pmu.c
+++ b/tests/perf_pmu.c
@@ -822,6 +822,7 @@ sema_busy(int gem_fd,
 	int fd;
+	igt_require(gem_scheduler_has_preemption(gem_fd));
 	fd = open_group(gem_fd,
 			I915_PMU_ENGINE_SEMA(e->class, e->instance), -1);

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