drm/etnaviv: skip command stream validation on PPAS capable GPUs

With per-process address spaces in place, a rogue process submitting
bogus command streams can only hurt itself. There is no need to
validate the command stream before execution anymore.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Guido Günther <agx@sigxcpu.org>

drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c

@@ -517,7 +517,8 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 	if (ret)
 		goto err_submit_objects;
 
-	if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
+	if ((priv->mmu_global->version != ETNAVIV_IOMMU_V2) &&
+	    !etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
 				      relocs, args->nr_relocs)) {
 		ret = -EINVAL;
 		goto err_submit_objects;