drm/i915: Rebind bo if currently bound with incorrect alignment.

commit ac0c6b5ad3b3b513e1057806d4b7627fcc0ecc27 upstream.

Whilst pinning the buffer, check that that its current alignment
matches the requested alignment. If it does not, rebind.

This should clear up any final render errors whilst resuming,
for reference:

  Bug 27070 - [i915] Page table errors with empty ringbuffer
  https://bugs.freedesktop.org/show_bug.cgi?id=27070

  Bug 15502 -  render error detected, EIR: 0x00000010
  https://bugzilla.kernel.org/show_bug.cgi?id=15502

  Bug 13844 -  i915 error: "render error detected"
  https://bugzilla.kernel.org/show_bug.cgi?id=13844

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 72bec8c62bf6e259912f35ab1053e4e8cab00e78..df6f7c947209bf14e0f7f1b30572202635b3a6d7 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3947,6 +3947,17 @@ i915_gem_object_pin(struct drm_gem_object *obj, uint32_t alignment)
        int ret;
 
        i915_verify_inactive(dev, __FILE__, __LINE__);
+
+       if (obj_priv->gtt_space != NULL) {
+               if (alignment == 0)
+                       alignment = i915_gem_get_gtt_alignment(obj);
+               if (obj_priv->gtt_offset & (alignment - 1)) {
+                       ret = i915_gem_object_unbind(obj);
+                       if (ret)
+                               return ret;
+               }
+       }
+
        if (obj_priv->gtt_space == NULL) {
                ret = i915_gem_object_bind_to_gtt(obj, alignment);
                if (ret)