[PATCH] drm/i915: Show GEM_TRACE when detecting a failed GPU idle

[Chris Wilson <chris@chris-wilson.co.uk>]

If we timeout waiting for the GPU to idle, something went seriously
wrong. We currently dump the engine state, but we can also dump the
ftrace buffer showing our last operations (when available).

In passing, note that since commit 559e040f1f08 ("drm/i915: Show the GPU
state when declaring wedged", we now show the engine state twice, once
in detecting the failed idle and then again on declaring wedged.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 11 +----------
 drivers/gpu/drm/i915/i915_gem.h |  2 ++
 2 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index ab88ca53c9a0..8bd8cb7c198e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3657,16 +3657,7 @@ static int wait_for_engines(struct drm_i915_private *i915)
 	if (wait_for(intel_engines_are_idle(i915), I915_IDLE_ENGINES_TIMEOUT)) {
 		dev_err(i915->drm.dev,
 			"Failed to idle engines, declaring wedged!\n");
-		if (drm_debug & DRM_UT_DRIVER) {
-			struct drm_printer p = drm_debug_printer(__func__);
-			struct intel_engine_cs *engine;
-			enum intel_engine_id id;
-
-			for_each_engine(engine, i915, id)
-				intel_engine_dump(engine, &p,
-						  "%s\n", engine->name);
-		}
-
+		GEM_TRACE_DUMP();
 		i915_gem_set_wedged(i915);
 		return -EIO;
 	}
diff --git a/drivers/gpu/drm/i915/i915_gem.h b/drivers/gpu/drm/i915/i915_gem.h
index f54c4ff74ded..8fdaa08e7bfb 100644
--- a/drivers/gpu/drm/i915/i915_gem.h
+++ b/drivers/gpu/drm/i915/i915_gem.h
@@ -53,8 +53,10 @@
 
 #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM)
 #define GEM_TRACE(...) trace_printk(__VA_ARGS__)
+#define GEM_TRACE_DUMP() ftrace_dump()
 #else
 #define GEM_TRACE(...) do { } while (0)
+#define GEM_TRACE_DUMP() do { } while (0)
 #endif
 
 #define I915_NUM_ENGINES 8
-- 
2.16.2

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