[Intel-gfx] [PATCH 1/3] drm/i915: Unbind the bo if the user requests a different alignment

[Chris Wilson]

If the buffer is currently bound and does not meet the requested
alignment, then unbind it and repin.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c |   20 ++++++++++----------
 1 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 309fd06..c148170 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1332,7 +1332,7 @@ i915_gem_free_mmap_offset(struct drm_gem_object *obj)
  * potential fence register mapping if needed.
  */
 static uint32_t
-i915_gem_get_gtt_alignment(struct drm_gem_object *obj)
+i915_gem_get_fence_alignment(struct drm_gem_object *obj)
 {
 	struct drm_device *dev = obj->dev;
 	struct drm_i915_gem_object *obj_priv = obj->driver_private;
@@ -2615,6 +2615,7 @@ i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
 {
 	struct drm_device *dev = obj->dev;
 	drm_i915_private_t *dev_priv = dev->dev_private;
+	unsigned fence_alignment;
 	struct drm_i915_gem_object *obj_priv = obj->driver_private;
 	struct drm_mm_node *free_space;
 	gfp_t gfpmask =  __GFP_NORETRY | __GFP_NOWARN;
@@ -2625,12 +2626,9 @@ i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
 		return -EINVAL;
 	}
 
-	if (alignment == 0)
-		alignment = i915_gem_get_gtt_alignment(obj);
-	if (alignment & (i915_gem_get_gtt_alignment(obj) - 1)) {
-		DRM_ERROR("Invalid object alignment requested %u\n", alignment);
-		return -EINVAL;
-	}
+	fence_alignment = i915_gem_get_fence_alignment(obj);
+	if (alignment < fence_alignment)
+		alignment = fence_alignment;
 
  search_free:
 	free_space = drm_mm_search_free(&dev_priv->mm.gtt_space,
@@ -3286,9 +3284,11 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
 	             obj_priv->tiling_mode != I915_TILING_NONE;
 
 	/* Check fence reg constraints and rebind if necessary */
-	if (need_fence &&
-	    !i915_gem_object_fence_offset_ok(obj,
-					     obj_priv->tiling_mode)) {
+	if ((need_fence &&
+	     !i915_gem_object_fence_offset_ok(obj,
+					      obj_priv->tiling_mode)) ||
+	    (entry->alignment &&
+	     obj_priv->gtt_offset & (entry->alignment - 1))) {
 		ret = i915_gem_object_unbind(obj);
 		if (ret)
 			return ret;
-- 
1.7.0.3