[Intel-gfx] [PATCH v3 2/4] drm/i915: Make engine state pretty-printer header configurable

[Chris Wilson]

Pass in a format string (and args) to specify the header to be emitted
along with the engine state when pretty-printing. This allows the header
to be emitted inside the drm_printer stream, so sharing the same prefix
and output characteristics (e.g. debug level and filtering).

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_debugfs.c              |  2 +-
 drivers/gpu/drm/i915/intel_engine_cs.c           | 18 ++++++++++++------
 drivers/gpu/drm/i915/intel_ringbuffer.h          |  5 ++++-
 drivers/gpu/drm/i915/selftests/intel_hangcheck.c | 21 ++++++++++++---------
 4 files changed, 29 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 533ba096b9a6..8c5c4f161147 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3248,7 +3248,7 @@ static int i915_engine_info(struct seq_file *m, void *unused)
 
 	p = drm_seq_file_printer(m);
 	for_each_engine(engine, dev_priv, id)
-		intel_engine_dump(engine, &p);
+		intel_engine_dump(engine, &p, "%s\n", engine->name);
 
 	intel_runtime_pm_put(dev_priv);
 
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 403cc4749008..54d19784b6ab 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1652,12 +1652,12 @@ void intel_engines_park(struct drm_i915_private *i915)
 		 * will be no more interrupts arriving later and the engines
 		 * are truly idle.
 		 */
-		if (!intel_engine_is_idle(engine)) {
+		if (GEM_WARN_ON(!intel_engine_is_idle(engine))) {
 			struct drm_printer p = drm_debug_printer(__func__);
 
-			DRM_ERROR("%s is not idle before parking\n",
-				  engine->name);
-			intel_engine_dump(engine, &p);
+			intel_engine_dump(engine, &p,
+					  "%s is not idle before parking\n",
+					  engine->name);
 		}
 
 		if (engine->park)
@@ -1727,7 +1727,9 @@ static void print_request(struct drm_printer *m,
 		   rq->timeline->common->name);
 }
 
-void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *m)
+void intel_engine_dump(struct intel_engine_cs *engine,
+		       struct drm_printer *m,
+		       const char *fmt, ...)
 {
 	struct intel_breadcrumbs * const b = &engine->breadcrumbs;
 	const struct intel_engine_execlists * const execlists = &engine->execlists;
@@ -1735,9 +1737,13 @@ void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *m)
 	struct drm_i915_private *dev_priv = engine->i915;
 	struct drm_i915_gem_request *rq;
 	struct rb_node *rb;
+	va_list ap;
 	u64 addr;
 
-	drm_printf(m, "%s\n", engine->name);
+	va_start(ap, fmt);
+	drm_vprintf(m, fmt, &ap);
+	va_end(ap);
+
 	drm_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [%d ms], inflight %d\n",
 		   intel_engine_get_seqno(engine),
 		   intel_engine_last_submit(engine),
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 2b0ae5468f48..a1a33466683b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -936,6 +936,9 @@ unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915);
 
 bool intel_engine_can_store_dword(struct intel_engine_cs *engine);
 
-void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *p);
+__printf(3, 4)
+void intel_engine_dump(struct intel_engine_cs *engine,
+		       struct drm_printer *m,
+		       const char *fmt, ...);
 
 #endif /* _INTEL_RINGBUFFER_H_ */
diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
index 71ce06680d66..18f181c46443 100644
--- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
@@ -626,9 +626,10 @@ static int igt_wait_reset(void *arg)
 	if (!wait_for_hang(&h, rq)) {
 		struct drm_printer p = drm_info_printer(i915->drm.dev);
 
-		pr_err("Failed to start request %x, at %x\n",
-		       rq->fence.seqno, hws_seqno(&h, rq));
-		intel_engine_dump(rq->engine, &p);
+		intel_engine_dump(rq->engine, &p,
+				  "%s: Failed to start request %x, at %x\n",
+				  rq->engine->name,
+				  rq->fence.seqno, hws_seqno(&h, rq));
 
 		i915_reset(i915, 0);
 		i915_gem_set_wedged(i915);
@@ -721,9 +722,10 @@ static int igt_reset_queue(void *arg)
 			if (!wait_for_hang(&h, prev)) {
 				struct drm_printer p = drm_info_printer(i915->drm.dev);
 
-				pr_err("Failed to start request %x, at %x\n",
-				       prev->fence.seqno, hws_seqno(&h, prev));
-				intel_engine_dump(rq->engine, &p);
+				intel_engine_dump(rq->engine, &p,
+						  "%s: Failed to start request %x, at %x\n",
+						  prev->engine->name,
+						  prev->fence.seqno, hws_seqno(&h, prev));
 
 				i915_gem_request_put(rq);
 				i915_gem_request_put(prev);
@@ -827,9 +829,10 @@ static int igt_handle_error(void *arg)
 	if (!wait_for_hang(&h, rq)) {
 		struct drm_printer p = drm_info_printer(i915->drm.dev);
 
-		pr_err("Failed to start request %x, at %x\n",
-		       rq->fence.seqno, hws_seqno(&h, rq));
-		intel_engine_dump(rq->engine, &p);
+		intel_engine_dump(rq->engine, &p,
+				  "%s: Failed to start request %x, at %x\n",
+				  rq->engine->name,
+				  rq->fence.seqno, hws_seqno(&h, rq));
 
 		i915_reset(i915, 0);
 		i915_gem_set_wedged(i915);
-- 
2.15.0