[Intel-gfx] [PATCH 01/43] drm/i915: Reorder the actual workload submission so that args checking is done earlier

[Thomas Daniel]

From: Oscar Mateo <oscar.mateo at intel.com>

In this patch:

commit 78382593e921c88371abd019aca8978db3248a8f
Author: Oscar Mateo <oscar.mateo at intel.com>
Date:   Thu Jul 3 16:28:05 2014 +0100

    drm/i915: Extract the actual workload submission mechanism from execbuffer

    So that we isolate the legacy ringbuffer submission mechanism, which becomes
    a good candidate to be abstracted away. This is prep-work for Execlists (which
    will its own workload submission mechanism).

    No functional changes.

I changed the order in which the args checking is done. I don't know why I did (brain
fade?) but itś not right. I haven't seen any ill effect from this, but the Execlists
version of this function will have problems if the order is not correct.

Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |   86 ++++++++++++++--------------
 1 file changed, 43 insertions(+), 43 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 60998fc..c5115957 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1042,6 +1042,43 @@ legacy_ringbuffer_submission(struct drm_device *dev, struct drm_file *file,
 	u32 instp_mask;
 	int i, ret = 0;
 
+	instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
+	instp_mask = I915_EXEC_CONSTANTS_MASK;
+	switch (instp_mode) {
+	case I915_EXEC_CONSTANTS_REL_GENERAL:
+	case I915_EXEC_CONSTANTS_ABSOLUTE:
+	case I915_EXEC_CONSTANTS_REL_SURFACE:
+		if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
+			DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
+			ret = -EINVAL;
+			goto error;
+		}
+
+		if (instp_mode != dev_priv->relative_constants_mode) {
+			if (INTEL_INFO(dev)->gen < 4) {
+				DRM_DEBUG("no rel constants on pre-gen4\n");
+				ret = -EINVAL;
+				goto error;
+			}
+
+			if (INTEL_INFO(dev)->gen > 5 &&
+			    instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
+				DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
+				ret = -EINVAL;
+				goto error;
+			}
+
+			/* The HW changed the meaning on this bit on gen6 */
+			if (INTEL_INFO(dev)->gen >= 6)
+				instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
+		}
+		break;
+	default:
+		DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
+		ret = -EINVAL;
+		goto error;
+	}
+
 	if (args->num_cliprects != 0) {
 		if (ring != &dev_priv->ring[RCS]) {
 			DRM_DEBUG("clip rectangles are only valid with the render ring\n");
@@ -1085,6 +1122,12 @@ legacy_ringbuffer_submission(struct drm_device *dev, struct drm_file *file,
 		}
 	}
 
+	if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
+		ret = i915_reset_gen7_sol_offsets(dev, ring);
+		if (ret)
+			goto error;
+	}
+
 	ret = i915_gem_execbuffer_move_to_gpu(ring, vmas);
 	if (ret)
 		goto error;
@@ -1093,43 +1136,6 @@ legacy_ringbuffer_submission(struct drm_device *dev, struct drm_file *file,
 	if (ret)
 		goto error;
 
-	instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
-	instp_mask = I915_EXEC_CONSTANTS_MASK;
-	switch (instp_mode) {
-	case I915_EXEC_CONSTANTS_REL_GENERAL:
-	case I915_EXEC_CONSTANTS_ABSOLUTE:
-	case I915_EXEC_CONSTANTS_REL_SURFACE:
-		if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
-			DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
-			ret = -EINVAL;
-			goto error;
-		}
-
-		if (instp_mode != dev_priv->relative_constants_mode) {
-			if (INTEL_INFO(dev)->gen < 4) {
-				DRM_DEBUG("no rel constants on pre-gen4\n");
-				ret = -EINVAL;
-				goto error;
-			}
-
-			if (INTEL_INFO(dev)->gen > 5 &&
-			    instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
-				DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
-				ret = -EINVAL;
-				goto error;
-			}
-
-			/* The HW changed the meaning on this bit on gen6 */
-			if (INTEL_INFO(dev)->gen >= 6)
-				instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
-		}
-		break;
-	default:
-		DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
-		ret = -EINVAL;
-		goto error;
-	}
-
 	if (ring == &dev_priv->ring[RCS] &&
 			instp_mode != dev_priv->relative_constants_mode) {
 		ret = intel_ring_begin(ring, 4);
@@ -1145,12 +1151,6 @@ legacy_ringbuffer_submission(struct drm_device *dev, struct drm_file *file,
 		dev_priv->relative_constants_mode = instp_mode;
 	}
 
-	if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
-		ret = i915_reset_gen7_sol_offsets(dev, ring);
-		if (ret)
-			goto error;
-	}
-
 	exec_len = args->batch_len;
 	if (cliprects) {
 		for (i = 0; i < args->num_cliprects; i++) {
-- 
1.7.9.5