Check for vebox support before testing

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=63941

lib/drmtest.c

@@ -270,6 +270,21 @@ void gem_set_tiling(int fd, uint32_t handle, int tiling, int stride)
 	assert(st.tiling_mode == tiling);
 }
 
+#define LOCAL_I915_PARAM_HAS_VEBOX 22
+int gem_has_vebox(int fd)
+{
+	struct drm_i915_getparam gp;
+	int val;
+
+	gp.param = LOCAL_I915_PARAM_HAS_VEBOX;
+	gp.value = &val;
+
+	if (ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp, sizeof(gp)))
+		return 0;
+
+	return val != 0;
+}
+
 struct local_drm_i915_gem_cacheing {
 	uint32_t handle;
 	uint32_t cacheing;

lib/drmtest.h

@@ -47,6 +47,7 @@ int drm_open_any_master(void);
 void gem_quiescent_gpu(int fd);
 
 /* ioctl wrappers and similar stuff for bare metal testing */
+int gem_has_vebox(int fd);
 void gem_set_tiling(int fd, uint32_t handle, int tiling, int stride);
 int gem_has_cacheing(int fd);
 void gem_set_cacheing(int fd, uint32_t handle, int cacheing);