drm/i915: Clear fence register on tiling stride change.

The fence register value also depends upon the stride of the object, so we
need to clear the fence if that is changed as well.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
[anholt: Added 8xx and 965 paths, and renamed the confusing
i915_gem_object_tiling_ok function to i915_gem_object_fence_offset_ok]
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 51 insertions, 16 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index 9a05cadaa4ad..5c1ceec49f5b 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -408,7 +408,7 @@ i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode)
 	if (stride & (stride - 1))
 		return false;
 
-	/* We don't handle the aperture area covered by the fence being bigger
+	/* We don't 0handle the aperture area covered by the fence being bigger
 	 * than the object size.
 	 */
 	if (i915_get_fence_size(dev, size) != size)
@@ -417,6 +417,33 @@ i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode)
 	return true;
 }
 
+static bool
+i915_gem_object_fence_offset_ok(struct drm_gem_object *obj, int tiling_mode)
+{
+	struct drm_device *dev = obj->dev;
+	struct drm_i915_gem_object *obj_priv = obj->driver_private;
+
+	if (obj_priv->gtt_space == NULL)
+		return true;
+
+	if (tiling_mode == I915_TILING_NONE)
+		return true;
+
+	if (!IS_I965G(dev)) {
+		if (obj_priv->gtt_offset & (obj->size - 1))
+			return false;
+		if (IS_I9XX(dev)) {
+			if (obj_priv->gtt_offset & ~I915_FENCE_START_MASK)
+				return false;
+		} else {
+			if (obj_priv->gtt_offset & ~I830_FENCE_START_MASK)
+				return false;
+		}
+	}
+
+	return true;
+}
+
 /**
  * Sets the tiling mode of an object, returning the required swizzling of
  * bit 6 of addresses in the object.
@@ -429,6 +456,7 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	struct drm_gem_object *obj;
 	struct drm_i915_gem_object *obj_priv;
+	int ret = 0;
 
 	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 	if (obj == NULL)
@@ -436,14 +464,15 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
 	obj_priv = obj->driver_private;
 
 	if (!i915_tiling_ok(dev, args->stride, obj->size, args->tiling_mode)) {
+		mutex_lock(&dev->struct_mutex);
 		drm_gem_object_unreference(obj);
+		mutex_unlock(&dev->struct_mutex);
 		return -EINVAL;
 	}
 
-	mutex_lock(&dev->struct_mutex);
-
 	if (args->tiling_mode == I915_TILING_NONE) {
 		args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE;
+		args->stride = 0;
 	} else {
 		if (args->tiling_mode == I915_TILING_X)
 			args->swizzle_mode = dev_priv->mm.bit_6_swizzle_x;
@@ -466,32 +495,38 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
 		if (args->swizzle_mode == I915_BIT_6_SWIZZLE_UNKNOWN) {
 			args->tiling_mode = I915_TILING_NONE;
 			args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE;
+			args->stride = 0;
 		}
 	}
-	if (args->tiling_mode != obj_priv->tiling_mode) {
-		int ret;
 
-		/* Unbind the object, as switching tiling means we're
-		 * switching the cache organization due to fencing, probably.
+	mutex_lock(&dev->struct_mutex);
+	if (args->tiling_mode != obj_priv->tiling_mode ||
+	    args->stride != obj_priv->stride) {
+		/* We need to rebind the object if its current allocation
+		 * no longer meets the alignment restrictions for its new
+		 * tiling mode. Otherwise we can just leave it alone, but
+		 * need to ensure that any fence register is cleared.
 		 */
-		ret = i915_gem_object_unbind(obj);
+		if (!i915_gem_object_fence_offset_ok(obj, args->tiling_mode))
+		    ret = i915_gem_object_unbind(obj);
+		else
+		    ret = i915_gem_object_put_fence_reg(obj);
 		if (ret != 0) {
 			WARN(ret != -ERESTARTSYS,
-			     "failed to unbind object for tiling switch");
+			     "failed to reset object for tiling switch");
 			args->tiling_mode = obj_priv->tiling_mode;
-			mutex_unlock(&dev->struct_mutex);
-			drm_gem_object_unreference(obj);
-
-			return ret;
+			args->stride = obj_priv->stride;
+			goto err;
 		}
+
 		obj_priv->tiling_mode = args->tiling_mode;
+		obj_priv->stride = args->stride;
 	}
-	obj_priv->stride = args->stride;
-
+err:
 	drm_gem_object_unreference(obj);
 	mutex_unlock(&dev->struct_mutex);
 
-	return 0;
+	return ret;
 }
 
 /**