[igt-dev] [PATCH i-g-t 04/15] perf_pmu: Quiesce GPU if measuring idle busyness without spinner

[Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>]

The assumption in some tests is that the engines are not busy if no
spinners are being run. This is not true in some cases where we see
that the render is busy at the start of the test. Quiesce GPU to wait
for such work to complete before checking for idle busyness.

v2: Move gem_quiescent_gpu to beginning of test (Tvrtko)

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
 tests/i915/perf_pmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/i915/perf_pmu.c b/tests/i915/perf_pmu.c
index 0b1177785..6080c5fdc 100644
--- a/tests/i915/perf_pmu.c
+++ b/tests/i915/perf_pmu.c
@@ -279,6 +279,7 @@ single(int gem_fd, const intel_ctx_t *ctx,
 	int fd;
 	uint64_t ahnd = get_reloc_ahnd(gem_fd, ctx->id);
 
+	gem_quiescent_gpu(gem_fd);
 	fd = open_pmu(gem_fd, I915_PMU_ENGINE_BUSY(e->class, e->instance));
 
 	if (flags & TEST_BUSY)
@@ -639,6 +640,7 @@ no_sema(int gem_fd, const intel_ctx_t *ctx,
 	int fd[2];
 	uint64_t ahnd = get_reloc_ahnd(gem_fd, ctx->id);
 
+	gem_quiescent_gpu(gem_fd);
 	fd[0] = open_group(gem_fd, I915_PMU_ENGINE_SEMA(e->class, e->instance),
 			   -1);
 	fd[1] = open_group(gem_fd, I915_PMU_ENGINE_WAIT(e->class, e->instance),
-- 
2.34.1