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drm/i915: Emit a backtrace if we attempt to rebind a pinned buffer 

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@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Chris Wilson 2010-08-04 12:37:41 +01:00 committed by Eric Anholt
parent 87f8ebf309
commit ae7d49d879
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/i915_gem.c
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@ -4198,6 +4198,10 @@ 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;