[PATCH 08/13] drm/i915: Add pin count trace point

[ville.syrjala at linux.intel.com]

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

A new trace point for tracking changes to gem object pin count.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c   |    6 ++++++
 drivers/gpu/drm/i915/i915_trace.h |   19 +++++++++++++++++++
 2 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5158461..0bfc8af 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3466,6 +3466,8 @@ i915_gem_object_pin(struct drm_i915_gem_object *obj,
 	if (!obj->has_global_gtt_mapping && map_and_fenceable)
 		i915_gem_gtt_bind_object(obj, obj->cache_level);
 
+	trace_i915_gem_object_pin_count(obj, obj->pin_count, obj->pin_count + 1);
+
 	obj->pin_count++;
 	obj->pin_mappable |= map_and_fenceable;
 
@@ -3475,6 +3477,8 @@ i915_gem_object_pin(struct drm_i915_gem_object *obj,
 void
 i915_gem_object_unpin(struct drm_i915_gem_object *obj)
 {
+	trace_i915_gem_object_pin_count(obj, obj->pin_count, obj->pin_count - 1);
+
 	BUG_ON(obj->pin_count == 0);
 	BUG_ON(obj->gtt_space == NULL);
 
@@ -3753,6 +3757,8 @@ void i915_gem_free_object(struct drm_gem_object *gem_obj)
 	if (obj->phys_obj)
 		i915_gem_detach_phys_object(dev, obj);
 
+	trace_i915_gem_object_pin_count(obj, obj->pin_count, 0);
+
 	obj->pin_count = 0;
 	if (WARN_ON(i915_gem_object_unbind(obj) == -ERESTARTSYS)) {
 		bool was_interruptible;
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index 3db4a68..44f8d40 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -16,6 +16,25 @@
 
 /* object tracking */
 
+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),
+
+	    TP_STRUCT__entry(
+			     __field(struct drm_i915_gem_object *, obj)
+			     __field(u32, pin_count_pre)
+			     __field(u32, pin_count_post)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->obj = obj;
+			   __entry->pin_count_pre = pin_count_pre;
+			   __entry->pin_count_post = pin_count_post;
+			   ),
+
+	    TP_printk("obj=%p, pin_count=%u->%u", __entry->obj, __entry->pin_count_pre, __entry->pin_count_post)
+);
+
 TRACE_EVENT(i915_gem_object_create,
 	    TP_PROTO(struct drm_i915_gem_object *obj),
 	    TP_ARGS(obj),
-- 
1.7.8.6