linux-kernel - [PATCH v2 2/4] drm/msm/a5xx: properly clear preemption records on resume

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240901135419.1075412-3-vladimir.lypak@gmail.com>
Date: Sun,  1 Sep 2024 13:54:01 +0000
From: Vladimir Lypak <vladimir.lypak@...il.com>
To: Vladimir Lypak <vladimir.lypak@...il.com>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Clark <robdclark@...il.com>,
	Sean Paul <sean@...rly.run>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Abhinav Kumar <quic_abhinavk@...cinc.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Jordan Crouse <jordan@...micpenguin.net>,
	linux-arm-msm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	freedreno@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/4] drm/msm/a5xx: properly clear preemption records on resume

Two fields of preempt_record which are used by CP aren't reset on
resume: "data" and "info". This is the reason behind faults which happen
when we try to switch to the ring that was active last before suspend.
In addition those faults can't be recovered from because we use suspend
and resume to do so (keeping values of those fields again).

Fixes: b1fc2839d2f9 ("drm/msm: Implement preemption for A5XX targets")
Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/gpu/drm/msm/adreno/a5xx_preempt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
index f58dd564d122..67a8ef4adf6b 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
@@ -204,6 +204,8 @@ void a5xx_preempt_hw_init(struct msm_gpu *gpu)
 		return;
 
 	for (i = 0; i < gpu->nr_rings; i++) {
+		a5xx_gpu->preempt[i]->data = 0;
+		a5xx_gpu->preempt[i]->info = 0;
 		a5xx_gpu->preempt[i]->wptr = 0;
 		a5xx_gpu->preempt[i]->rptr = 0;
 		a5xx_gpu->preempt[i]->rbase = gpu->rb[i]->iova;
-- 
2.46.0