linux-kernel - [PATCH 5.14 044/125] drm/i915: Convert unconditional clflush to drm_clflush_virt

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Message-Id: <20211101082541.517053190@linuxfoundation.org>
Date:   Mon,  1 Nov 2021 10:16:57 +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>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, Dave Airlie <airlied@...hat.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Thomas Hellström <thomas.hellstrom@...el.com>
Subject: [PATCH 5.14 044/125] drm/i915: Convert unconditional clflush to drm_clflush_virt_range()

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

commit fcf918ffd3b35e288097036c04af7446b2c6f2f1 upstream.

This one is apparently a "clflush for good measure", so bit more
justification (if you can call it that) than some of the others.
Convert to drm_clflush_virt_range() again so that machines without
clflush will survive the ordeal.

Cc: stable@...r.kernel.org
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Thomas Hellström <thomas.hellstrom@...el.com> #v1
Fixes: 12ca695d2c1e ("drm/i915: Do not share hwsp across contexts any more, v8.")
Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211014090941.12159-3-ville.syrjala@linux.intel.com
Reviewed-by: Dave Airlie <airlied@...hat.com>
(cherry picked from commit af7b6d234eefa30c461cc16912bafb32b9e6141c)
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
@@ -225,7 +225,7 @@ void intel_timeline_reset_seqno(const st
 
 	memset(hwsp_seqno + 1, 0, TIMELINE_SEQNO_BYTES - sizeof(*hwsp_seqno));
 	WRITE_ONCE(*hwsp_seqno, tl->seqno);
-	clflush(hwsp_seqno);
+	drm_clflush_virt_range(hwsp_seqno, TIMELINE_SEQNO_BYTES);
 }
 
 void intel_timeline_enter(struct intel_timeline *tl)