We have a hole in our busy-stat accounting if the pmu is enabled during
a long running batch, the pmu will not start accumulating busy-time
until the next context switch. This then fails tests that are only
sampling a single batch.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
drivers/gpu/drm/i915/intel_engine_cs.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
b/drivers/gpu/drm/i915/intel_engine_cs.c
index ebdcbcbacb3c..c2f01ff96ce1 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1946,8 +1946,15 @@ int intel_enable_engine_stats(struct intel_engine_cs
*engine)
spin_lock_irqsave(&engine->stats.lock, flags);
if (engine->stats.enabled == ~0)
goto busy;
- if (engine->stats.enabled++ == 0)
+ if (engine->stats.enabled++ == 0) {
engine->stats.enabled_at = ktime_get();
+
+ /* XXX submission method oblivious */
+ engine->stats.active = port_count(&engine->execlists.port[1]);
+ engine->stats.active += port_count(&engine->execlists.port[0]);
+ if (engine->stats.active)
+ engine->stats.start = engine->stats.enabled_at;
+ }
spin_unlock_irqrestore(&engine->stats.lock, flags);
return 0;
--
2.15.1
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