brcm2708: update to latest patches from RPi Foundation

[openwrt/staging/dedeckeh.git] / target / linux / brcm2708 / patches-4.19 / 950-0500-drm-v3d-Invalidate-the-caches-from-the-outside-in.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0500-drm-v3d-Invalidate-the-caches-from-the-outside-in.patch b/target/linux/brcm2708/patches-4.19/950-0500-drm-v3d-Invalidate-the-caches-from-the-outside-in.patch
new file mode 100644 (file)
index 0000000..7682ab6
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0500-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