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From bf3107de907c969f7b1d7b1cf9a6504f85a5e789 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Mon, 3 Dec 2018 14:24:38 -0800
Subject: [PATCH 571/782] 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 <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20181203222438.25417-6-eric@anholt.net
Reviewed-by: Dave Emett <david.emett@broadcom.com>
(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
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