This is a note to let you know that I've just added the patch titled
drm/i915: Catch yet another unconditioal clflush
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-catch-yet-another-unconditioal-clflush.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9761ffb8f1090289b908590039e2c363cc35cf45 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Thu, 14 Oct 2021 12:09:40 +0300
Subject: drm/i915: Catch yet another unconditioal clflush
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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
commit 9761ffb8f1090289b908590039e2c363cc35cf45 upstream.
Replace the unconditional clflush() with drm_clflush_virt_range()
which does the wbinvd() fallback when clflush is not available.
This time no justification is given for the clflush in the
offending commit.
Cc: stable@xxxxxxxxxxxxxxx
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Fixes: 2c8ab3339e39 ("drm/i915: Pin timeline map after first timeline pin, v4.")
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20211014090941.12159-4-ville.syrjala@xxxxxxxxxxxxxxx
Reviewed-by: Dave Airlie <airlied@xxxxxxxxxx>
(cherry picked from commit 9ced12182d0d8401d821e9602e56e276459900fc)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_timeline.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/gt/intel_timeline.c
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.c
@@ -64,7 +64,7 @@ intel_timeline_pin_map(struct intel_time
timeline->hwsp_map = vaddr;
timeline->hwsp_seqno = memset(vaddr + ofs, 0, TIMELINE_SEQNO_BYTES);
- clflush(vaddr + ofs);
+ drm_clflush_virt_range(vaddr + ofs, TIMELINE_SEQNO_BYTES);
return 0;
}
Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are
queue-5.14/drm-i915-dp-skip-the-hw-readout-of-dpcd-on-disabled-encoders.patch
queue-5.14/drm-i915-catch-yet-another-unconditioal-clflush.patch
queue-5.14/drm-i915-convert-unconditional-clflush-to-drm_clflush_virt_range.patch
