From 514653cd51ff6bc14268dc0f98ebb37daa8f0e88 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Mon, 3 Dec 2018 14:24:38 -0800 Subject: [PATCH 571/806] drm/v3d: Invalidate the caches from the outside in. This would be a fairly obscure race, but let's make sure we don't ever lose it. Signed-off-by: Eric Anholt Link: https://patchwork.freedesktop.org/patch/msgid/20181203222438.25417-6-eric@anholt.net Reviewed-by: Dave Emett (cherry picked from commit aa5beec32e8b78bfcf621e3c3daebfb1644b6365) --- drivers/gpu/drm/v3d/v3d_gem.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/v3d/v3d_gem.c +++ b/drivers/gpu/drm/v3d/v3d_gem.c @@ -171,11 +171,15 @@ v3d_invalidate_slices(struct v3d_dev *v3 void v3d_invalidate_caches(struct v3d_dev *v3d) { + /* Invalidate the caches from the outside in. That way if + * another CL's concurrent use of nearby memory were to pull + * an invalidated cacheline back in, we wouldn't leave stale + * data in the inner cache. + */ v3d_flush_l3(v3d); - v3d_invalidate_l2c(v3d, 0); - v3d_invalidate_slices(v3d, 0); v3d_flush_l2t(v3d, 0); + v3d_invalidate_slices(v3d, 0); } static void