[PATCH 09/13] drm/i915: Add trace points for flip queue length

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h     |    1 +
 drivers/gpu/drm/i915/i915_trace.h   |   15 +++++++++++++++
 drivers/gpu/drm/i915/intel_atomic.c |    9 ++++++++-
 3 files changed, 24 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 91e2dc6..3a9a8a0 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -929,6 +929,7 @@ typedef struct drm_i915_private {
 		struct work_struct work;
 		struct workqueue_struct *wq;
 		unsigned int next_flip_seq;
+		unsigned int queue_len;
 	} flip;
 } drm_i915_private_t;
 
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index 44f8d40..f71e1b3 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -16,6 +16,21 @@
 
 /* object tracking */
 
+TRACE_EVENT(i915_flip_queue_len,
+	    TP_PROTO(unsigned int queue_len),
+	    TP_ARGS(queue_len),
+
+	    TP_STRUCT__entry(
+			     __field(u32, queue_len)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->queue_len = queue_len;
+			   ),
+
+	    TP_printk("queue_len=%u", __entry->queue_len)
+);
+
 TRACE_EVENT(i915_gem_object_pin_count,
 	    TP_PROTO(struct drm_i915_gem_object *obj, u32 pin_count_pre, u32 pin_count_post),
 	    TP_ARGS(obj, pin_count_pre, pin_count_post),
diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index 6bec72b..f2e6d88 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -2195,9 +2195,12 @@ static void intel_atomic_process_flips_work(struct work_struct *work)
 				if (intel_flip->flip_seq != flip_seq)
 					break;
 				list_move_tail(&intel_flip->base.list, &flips);
+				dev_priv->flip.queue_len--;
 			}
 		}
 
+		trace_i915_flip_queue_len(dev_priv->flip.queue_len);
+
 		spin_unlock_irqrestore(&dev_priv->flip.lock, flags);
 
 		if (list_empty(&flips))
@@ -2441,8 +2444,12 @@ static void atomic_pipe_commit(struct drm_device *dev,
 
 	spin_lock_irqsave(&dev_priv->flip.lock, flags);
 
-	list_for_each_entry_safe(intel_flip, next, &flips, base.list)
+	list_for_each_entry_safe(intel_flip, next, &flips, base.list) {
 		list_move_tail(&intel_flip->base.list, &dev_priv->flip.list);
+		dev_priv->flip.queue_len++;
+	}
+
+	trace_i915_flip_queue_len(dev_priv->flip.queue_len);
 
 	/* if no rings are involved, we can avoid checking seqnos */
 	if (rings_mask == 0)
-- 
1.7.8.6