[PATCH 1/2] drm/i915/guc: Support engine busy stats

[Tvrtko Ursulin <tursulin@ursulin.net>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Place context in/out hooks into the GuC backend, when contexts are
assigned to ports, and removed from them, in order to be able to
provide engine busy stats in GuC mode.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Testcase: igt/perf_pmu/busy-accuracy-*-*
---
 drivers/gpu/drm/i915/intel_guc_submission.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c
index 649113c7a3c2..8e99f8fd6da2 100644
--- a/drivers/gpu/drm/i915/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/intel_guc_submission.c
@@ -673,6 +673,7 @@ static void guc_dequeue(struct intel_engine_cs *engine)
 	struct intel_engine_execlists * const execlists = &engine->execlists;
 	struct execlist_port *port = execlists->port;
 	struct i915_request *last = NULL;
+	struct i915_gem_context *last_ctx = NULL;
 	const struct execlist_port * const last_port =
 		&execlists->port[execlists->port_mask];
 	bool submit = false;
@@ -718,8 +719,13 @@ static void guc_dequeue(struct intel_engine_cs *engine)
 					goto done;
 				}
 
-				if (submit)
+				if (submit) {
 					port_assign(port, last);
+					if (last->ctx != last_ctx) {
+						intel_engine_context_in(last->engine);
+						last_ctx = last->ctx;
+					}
+				}
 				port++;
 			}
 
@@ -741,6 +747,8 @@ static void guc_dequeue(struct intel_engine_cs *engine)
 	execlists->first = rb;
 	if (submit) {
 		port_assign(port, last);
+		if (last->ctx != last_ctx)
+			intel_engine_context_in(last->engine);
 		execlists_set_active(execlists, EXECLISTS_ACTIVE_USER);
 		guc_submit(engine);
 	}
@@ -763,6 +771,7 @@ static void guc_submission_tasklet(unsigned long data)
 
 	rq = port_request(&port[0]);
 	while (rq && i915_request_completed(rq)) {
+		intel_engine_context_out(rq->engine);
 		trace_i915_request_out(rq);
 		i915_request_put(rq);
 
@@ -1192,8 +1201,6 @@ int intel_guc_submission_enable(struct intel_guc *guc)
 		execlists->tasklet.func = guc_submission_tasklet;
 		engine->park = guc_submission_park;
 		engine->unpark = guc_submission_unpark;
-
-		engine->flags &= ~I915_ENGINE_SUPPORTS_STATS;
 	}
 
 	return 0;
-- 
2.14.1

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