[Intel-gfx] [PATCH 2/5] drm/i915: extract constant offset setting

[Ben Widawsky]

Simple refactor.

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |   78 +++++++++++++++++-----------
 1 files changed, 47 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index cc69861..5f01227 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -954,6 +954,50 @@ i915_gem_execbuffer_retire_commands(struct drm_device *dev,
 }
 
 static int
+i915_gem_set_constant_offset(struct intel_ring_buffer *ring, int mode)
+{
+	struct drm_device *dev = ring->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	uint32_t mask = I915_EXEC_CONSTANTS_MASK;
+	int ret;
+
+	switch (mode) {
+	case I915_EXEC_CONSTANTS_REL_GENERAL:
+	case I915_EXEC_CONSTANTS_ABSOLUTE:
+	case I915_EXEC_CONSTANTS_REL_SURFACE:
+		if (ring == &dev_priv->ring[RCS] &&
+		    mode != dev_priv->relative_constants_mode) {
+			if (INTEL_INFO(dev)->gen < 4)
+				return -EINVAL;
+
+			if (INTEL_INFO(dev)->gen > 5 &&
+			    mode == I915_EXEC_CONSTANTS_REL_SURFACE)
+				return -EINVAL;
+
+			/* The HW changed the meaning on this bit on gen6 */
+			if (INTEL_INFO(dev)->gen >= 6)
+				mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
+
+			ret = intel_ring_begin(ring, 4);
+			if (ret)
+				return ret;
+
+			intel_ring_emit(ring, MI_NOOP);
+			intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
+			intel_ring_emit(ring, INSTPM);
+			intel_ring_emit(ring, mask << 16 | mode);
+			intel_ring_advance(ring);
+
+			dev_priv->relative_constants_mode = mode;
+		}
+		return 0;
+	default:
+		DRM_ERROR("execbuf with unknown constants: %d\n", mode);
+		return -EINVAL;
+	}
+}
+
+static int
 i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 		       struct drm_file *file,
 		       struct drm_i915_gem_execbuffer2 *args,
@@ -1005,37 +1049,9 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	}
 
 	mode = args->flags & I915_EXEC_CONSTANTS_MASK;
-	switch (mode) {
-	case I915_EXEC_CONSTANTS_REL_GENERAL:
-	case I915_EXEC_CONSTANTS_ABSOLUTE:
-	case I915_EXEC_CONSTANTS_REL_SURFACE:
-		if (ring == &dev_priv->ring[RCS] &&
-		    mode != dev_priv->relative_constants_mode) {
-			if (INTEL_INFO(dev)->gen < 4)
-				return -EINVAL;
-
-			if (INTEL_INFO(dev)->gen > 5 &&
-			    mode == I915_EXEC_CONSTANTS_REL_SURFACE)
-				return -EINVAL;
-
-			ret = intel_ring_begin(ring, 4);
-			if (ret)
-				return ret;
-
-			intel_ring_emit(ring, MI_NOOP);
-			intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
-			intel_ring_emit(ring, INSTPM);
-			intel_ring_emit(ring,
-					I915_EXEC_CONSTANTS_MASK << 16 | mode);
-			intel_ring_advance(ring);
-
-			dev_priv->relative_constants_mode = mode;
-		}
-		break;
-	default:
-		DRM_ERROR("execbuf with unknown constants: %d\n", mode);
-		return -EINVAL;
-	}
+	ret = i915_gem_set_constant_offset(ring, mode);
+	if (ret)
+		return ret;
 
 	if (args->buffer_count < 1) {
 		DRM_ERROR("execbuf with %d buffers\n", args->buffer_count);
-- 
1.7.7