drm/i915: Catch abuse of I915_EXEC_CONSTANTS_*

A bit tricky since 0 is also a valid constant ...

v2: Add DRM_DEBUG (Chris)

Testcase: igt/gem_exec_params/rel-constants-*
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 12 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 04102cc80ef4..c7ef65c3ae91 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1060,14 +1060,22 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
         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)
+                if (mode != 0 && ring != &dev_priv->ring[RCS]) {
+                        DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
+                        return -EINVAL;
+                }
+
+                if (mode != dev_priv->relative_constants_mode) {
+                        if (INTEL_INFO(dev)->gen < 4) {
+                                DRM_DEBUG("no rel constants on pre-gen4\n");
                                 return -EINVAL;
+                        }
 
                         if (INTEL_INFO(dev)->gen > 5 &&
-                            mode == I915_EXEC_CONSTANTS_REL_SURFACE)
+                            mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
+                                DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
                                 return -EINVAL;
+                        }
 
                         /* The HW changed the meaning on this bit on gen6 */
                         if (INTEL_INFO(dev)->gen >= 6)