2019-09-04 17:01:23 +00:00
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From bf3107de907c969f7b1d7b1cf9a6504f85a5e789 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Eric Anholt <eric@anholt.net>
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Date: Mon, 3 Dec 2018 14:24:38 -0800
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2019-09-04 17:01:23 +00:00
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Subject: [PATCH 571/782] drm/v3d: Invalidate the caches from the outside in.
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2019-07-09 18:32:28 +00:00
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This would be a fairly obscure race, but let's make sure we don't ever
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lose it.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Link: https://patchwork.freedesktop.org/patch/msgid/20181203222438.25417-6-eric@anholt.net
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Reviewed-by: Dave Emett <david.emett@broadcom.com>
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(cherry picked from commit aa5beec32e8b78bfcf621e3c3daebfb1644b6365)
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---
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drivers/gpu/drm/v3d/v3d_gem.c | 8 ++++++--
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1 file changed, 6 insertions(+), 2 deletions(-)
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--- a/drivers/gpu/drm/v3d/v3d_gem.c
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+++ b/drivers/gpu/drm/v3d/v3d_gem.c
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@@ -171,11 +171,15 @@ v3d_invalidate_slices(struct v3d_dev *v3
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void
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v3d_invalidate_caches(struct v3d_dev *v3d)
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{
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+ /* Invalidate the caches from the outside in. That way if
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+ * another CL's concurrent use of nearby memory were to pull
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+ * an invalidated cacheline back in, we wouldn't leave stale
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+ * data in the inner cache.
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+ */
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v3d_flush_l3(v3d);
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-
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v3d_invalidate_l2c(v3d, 0);
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- v3d_invalidate_slices(v3d, 0);
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v3d_flush_l2t(v3d, 0);
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+ v3d_invalidate_slices(v3d, 0);
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}
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static void
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