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>

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index 16e7d37..63a1206 100644 (file)
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/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;