lkml.org 
[lkml]   [2018]   [Dec]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 6/6] drm/v3d: Invalidate the caches from the outside in.
Date
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>
---
drivers/gpu/drm/v3d/v3d_gem.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index 8a4be9515179..443b1c53117a 100644
--- 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 *v3d, int core)
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
--
2.20.0.rc1
\
 
 \ /
  Last update: 2018-12-03 23:25    [W:0.072 / U:2.396 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site