[Intel-gfx] [PATCH] drm/i915: Emit a backtrace if we attempt to rebind a pinned buffer

[Chris Wilson]

This debugging trace was useful for finding the fbcon regression on
i965, and it may prove useful again in future.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index b09def9..b2ff908 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4010,6 +4010,10 @@ i915_gem_object_pin(struct drm_gem_object *obj, uint32_t alignment)
 		if (alignment == 0)
 			alignment = i915_gem_get_gtt_alignment(obj);
 		if (obj_priv->gtt_offset & (alignment - 1)) {
+			WARN(obj_priv->pin_count,
+			     "bo is already pinned with incorrect alignment:"
+			     " offset=%x, req.alignment=%x\n",
+			     obj_priv->gtt_offset, alignment);
 			ret = i915_gem_object_unbind(obj);
 			if (ret)
 				return ret;
-- 
1.7.1