[Intel-gfx] [PATCH 10/13] drm/i915: mark rings which were waiting when hang happened

[Mika Kuoppala]

For guilty batchbuffer analysis later on on ring resets,
mark all waiting rings so that we can skip them when
trying to find a true culprit for the gpu hang.

Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c         |   11 +++++++++--
 drivers/gpu/drm/i915/intel_ringbuffer.h |    1 +
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index bfe5e84..6664e22 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1761,13 +1761,20 @@ static bool kick_ring(struct intel_ring_buffer *ring)
 	struct drm_device *dev = ring->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 tmp = I915_READ_CTL(ring);
+
+	ring->hangcheck_was_waiting = false;
+
 	if (tmp & RING_WAIT) {
 		DRM_ERROR("Kicking stuck wait on %s\n",
 			  ring->name);
 		I915_WRITE_CTL(ring, tmp);
-		return true;
+		ring->hangcheck_was_waiting = true;
 	}
-	return false;
+
+	if ((INTEL_INFO(dev)->gen >= 6) && (tmp & RING_WAIT_SEMAPHORE))
+		ring->hangcheck_was_waiting = true;
+
+	return ring->hangcheck_was_waiting;
 }
 
 static bool i915_hangcheck_ring_hung(struct drm_device *dev,
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 97b8f37..573b0ef 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -139,6 +139,7 @@ struct  intel_ring_buffer {
 
 	u32 hangcheck_seqno;
 	int hangcheck_score;
+	bool hangcheck_was_waiting;
 
 	void *private;
 };
-- 
1.7.9.5