[Intel-gfx] [PATCH v3 2/2] drm/i915/selftest: Bump up sample period for busy stats selftest

[Umesh Nerlige Ramappa]

Engine busyness samples around a 10ms period is failing with busyness
ranging approx. from 87% to 115% as shown below. The expected range is
+/- 5% of the sample period. Fail 10% of the time.

rcs0: reported 11716042ns [91%] busyness while spinning [for 12805719ns]

When determining busyness of active engine, the GuC based engine
busyness implementation relies on a 64 bit timestamp register read. The
latency incurred by this register read causes the failure.

On DG1, when the test fails, the observed latencies range from 900us -
1.5ms.

Optimizing the 2x32 read by acquiring the lock and forcewake prior to
all reg reads reduces the rate of failure to around 2%, but does not
eliminate it.

In order to make the selftest more robust and always account for such
latencies, increase the sample period to 100 ms. This eliminates the
issue as seen in a 1000 runs.

v2: (Ashutosh)
- Add error to commit msg
- Include gitlab bug
- Update commit for inclusion of 2x32 optimized read

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/4418
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
---
 drivers/gpu/drm/i915/gt/selftest_engine_pm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/selftest_engine_pm.c b/drivers/gpu/drm/i915/gt/selftest_engine_pm.c
index 0dcb3ed44a73..87c94314cf67 100644
--- a/drivers/gpu/drm/i915/gt/selftest_engine_pm.c
+++ b/drivers/gpu/drm/i915/gt/selftest_engine_pm.c
@@ -317,7 +317,7 @@ static int live_engine_busy_stats(void *arg)
 		ENGINE_TRACE(engine, "measuring busy time\n");
 		preempt_disable();
 		de = intel_engine_get_busy_time(engine, &t[0]);
-		mdelay(10);
+		mdelay(100);
 		de = ktime_sub(intel_engine_get_busy_time(engine, &t[1]), de);
 		preempt_enable();
 		dt = ktime_sub(t[1], t[0]);
-- 
2.25.1