[RFC 7/8] drm/i915/tracepoints: Add backend level request in and out tracepoints

[Tvrtko Ursulin <tursulin@ursulin.net>]

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

Two new tracepoints placed at the call sites where requests are
actually passed to the GPU enable userspace to track engine
utilisation.

These tracepoints are only enabled when the
DRM_I915_LOW_LEVEL_TRACEPOINTS Kconfig option is enabled.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/i915_guc_submission.c |  2 ++
 drivers/gpu/drm/i915/i915_trace.h          | 49 ++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_lrc.c           |  4 +++
 3 files changed, 55 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 8ced9e26f075..beec88a30347 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -518,6 +518,8 @@ static void __i915_guc_submit(struct drm_i915_gem_request *rq)
 	if (i915_vma_is_map_and_fenceable(rq->ring->vma))
 		POSTING_READ_FW(GUC_STATUS);
 
+	trace_i915_gem_request_in(rq, 0);
+
 	b_ret = guc_ring_doorbell(client);
 
 	client->submissions[engine_id] += 1;
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index d24b89d0e3ab..18dd21653a80 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -582,6 +582,35 @@ DEFINE_EVENT(i915_gem_request, i915_gem_request_add,
 	    TP_ARGS(req)
 );
 
+DECLARE_EVENT_CLASS(i915_gem_request_hw,
+		    TP_PROTO(struct drm_i915_gem_request *req,
+			     unsigned int port),
+		    TP_ARGS(req, port),
+
+		    TP_STRUCT__entry(
+				     __field(u32, dev)
+				     __field(u32, ring)
+				     __field(u32, seqno)
+				     __field(u32, global_seqno)
+				     __field(u32, ctx)
+				     __field(u32, port)
+				    ),
+
+		    TP_fast_assign(
+			           __entry->dev = req->i915->drm.primary->index;
+			           __entry->ring = req->engine->id;
+			           __entry->ctx = req->ctx->hw_id;
+			           __entry->seqno = req->fence.seqno;
+			           __entry->global_seqno = req->global_seqno;
+			           __entry->port = port;
+			          ),
+
+		    TP_printk("dev=%u, ring=%u, ctx=%u, seqno=%u, global_seqno=%u, port=%u",
+			      __entry->dev, __entry->ring, __entry->ctx,
+			      __entry->seqno, __entry->global_seqno,
+			      __entry->port)
+);
+
 #if defined(CONFIG_DRM_I915_LOW_LEVEL_TRACEPOINTS)
 DEFINE_EVENT(i915_gem_request, i915_gem_request_submit,
 	     TP_PROTO(struct drm_i915_gem_request *req),
@@ -592,6 +621,16 @@ DEFINE_EVENT(i915_gem_request, i915_gem_request_execute,
 	     TP_PROTO(struct drm_i915_gem_request *req),
 	     TP_ARGS(req)
 );
+
+DEFINE_EVENT(i915_gem_request_hw, i915_gem_request_in,
+	     TP_PROTO(struct drm_i915_gem_request *req, unsigned int port),
+	     TP_ARGS(req, port)
+);
+
+DEFINE_EVENT(i915_gem_request_hw, i915_gem_request_out,
+	     TP_PROTO(struct drm_i915_gem_request *req, unsigned int port),
+	     TP_ARGS(req, port)
+);
 #else
 #if !defined(TRACE_HEADER_MULTI_READ)
 static inline void
@@ -603,6 +642,16 @@ static inline void
 trace_i915_gem_request_execute(struct drm_i915_gem_request *req)
 {
 }
+
+static inline void
+trace_i915_gem_request_in(struct drm_i915_gem_request *req, unsigned int port)
+{
+}
+
+static inline void
+trace_i915_gem_request_out(struct drm_i915_gem_request *req, unsigned int port)
+{
+}
 #endif
 #endif
 
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index bee9d565b8f3..85581a05657b 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -505,6 +505,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
 		cursor->priotree.priority = INT_MAX;
 
 		__i915_gem_request_submit(cursor);
+		trace_i915_gem_request_in(cursor, port - engine->execlist_port);
 		last = cursor;
 		submit = true;
 	}
@@ -561,6 +562,7 @@ static void intel_lrc_irq_handler(unsigned long data)
 	struct intel_engine_cs *engine = (struct intel_engine_cs *)data;
 	struct execlist_port *port = engine->execlist_port;
 	struct drm_i915_private *dev_priv = engine->i915;
+	unsigned int portidx = 0;
 
 	intel_uncore_forcewake_get(dev_priv, engine->fw_domains);
 
@@ -597,6 +599,8 @@ static void intel_lrc_irq_handler(unsigned long data)
 				execlists_context_status_change(port[0].request,
 								INTEL_CONTEXT_SCHEDULE_OUT);
 
+				trace_i915_gem_request_out(port[0].request,
+							   portidx++);
 				i915_gem_request_put(port[0].request);
 				port[0] = port[1];
 				memset(&port[1], 0, sizeof(port[1]));
-- 
2.7.4

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