[Intel-gfx] [PATCH igt] igt/perf_pmu: Most-busy requires at least one busy engine

[Chris Wilson]

The test is whether with all but one engine busy we record the correct
load on each engine. If we only have one engine, this test degenerates
into all-idle/all-busy, so we can skip to avoid crashing on the
assumption that we have a busy spinner.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 tests/perf_pmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
index f27b7ec7..b59af818 100644
--- a/tests/perf_pmu.c
+++ b/tests/perf_pmu.c
@@ -513,6 +513,7 @@ most_busy_check_all(int gem_fd, const struct intel_execution_engine2 *e,
 		val[i++] = I915_PMU_ENGINE_BUSY(e_->class, e_->instance);
 	}
 	igt_assert(i == num_engines);
+	igt_require(spin); /* at least one busy engine */
 
 	fd[0] = -1;
 	for (i = 0; i < num_engines; i++)
-- 
2.16.3