diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0498-drm-v3d-Invalidate-the-caches-from-the-outside-in.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0498-drm-v3d-Invalidate-the-caches-from-the-outside-in.patch | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0498-drm-v3d-Invalidate-the-caches-from-the-outside-in.patch b/target/linux/bcm27xx/patches-4.19/950-0498-drm-v3d-Invalidate-the-caches-from-the-outside-in.patch new file mode 100644 index 0000000000..7682ab677e --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0498-drm-v3d-Invalidate-the-caches-from-the-outside-in.patch @@ -0,0 +1,36 @@ +From 514653cd51ff6bc14268dc0f98ebb37daa8f0e88 Mon Sep 17 00:00:00 2001 +From: Eric Anholt <eric@anholt.net> +Date: Mon, 3 Dec 2018 14:24:38 -0800 +Subject: [PATCH] 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 |