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.
v2: Count each active port just once (context in/out events are only on
the first and last assigment to a port).
Testcase: igt/perf_pmu/busy-start
Testcase: igt/perf_pmu/busy-double-start
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_engine_cs.c | 10 +++++++++-
drivers/gpu/drm/i915/intel_ringbuffer.h | 2 +-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 6bb51a502b8b..3a11602e60c7 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1951,8 +1951,16 @@ 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_isset(&engine->execlists.port[1]) +
+ port_isset(&engine->execlists.port[0]);
+ if (engine->stats.active)
+ engine->stats.start = engine->stats.enabled_at;
+ }
spin_unlock_irqrestore(&engine->stats.lock, flags);
return 0;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index c5ff203e42d6..37cf665692e5 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -225,7 +225,7 @@ struct intel_engine_execlists {
#define port_pack(rq, count) ptr_pack_bits(rq, count, EXECLIST_COUNT_BITS)
#define port_unpack(p, count) ptr_unpack_bits((p)->request_count, count, EXECLIST_COUNT_BITS)
#define port_set(p, packed) ((p)->request_count = (packed))
-#define port_isset(p) ((p)->request_count)
+#define port_isset(p) (((p)->request_count) != NULL)
#define port_index(p, execlists) ((p) - (execlists)->port)
/**
--
2.15.1
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