linux-kernel - [PATCH 5.14 045/125] drm/i915: Catch yet another unconditioal clflush

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Date:   Mon,  1 Nov 2021 10:16:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, Dave Airlie <airlied@...hat.com>,
        Jani Nikula <jani.nikula@...el.com>
Subject: [PATCH 5.14 045/125] drm/i915: Catch yet another unconditioal clflush

From: Ville Syrjälä <ville.syrjala@...ux.intel.com>

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@...r.kernel.org
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
Fixes: 2c8ab3339e39 ("drm/i915: Pin timeline map after first timeline pin, v4.")
Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211014090941.12159-4-ville.syrjala@linux.intel.com
Reviewed-by: Dave Airlie <airlied@...hat.com>
(cherry picked from commit 9ced12182d0d8401d821e9602e56e276459900fc)
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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;
 }