linux-kernel - Re: [PATCH] drm/msm/a6xx+: Insert a fence wait before SMMU table update

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Message-ID: <20240917145203.2nznqdkrsfanttex@hu-akhilpo-hyd.qualcomm.com>
Date: Tue, 17 Sep 2024 20:22:03 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: Konrad Dybcio <konradybcio@...nel.org>
CC: Rob Clark <robdclark@...il.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <freedreno@...ts.freedesktop.org>,
        "Connor
 Abbott" <cwabbott0@...il.com>,
        Rob Clark <robdclark@...omium.org>, Sean Paul
	<sean@...rly.run>,
        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>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/a6xx+: Insert a fence wait before SMMU table
 update

On Tue, Sep 17, 2024 at 03:47:09PM +0200, Konrad Dybcio wrote:
> On 13.09.2024 9:51 PM, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> > 
> > The CP_SMMU_TABLE_UPDATE _should_ be waiting for idle, but on some
> > devices (x1-85, possibly others), it seems to pass that barrier while
> > there are still things in the event completion FIFO waiting to be
> > written back to memory.
> 
> Can we try to force-fault around here on other GPUs and perhaps
> limit this workaround?
> 
> Akhil, do we have any insight on this?

Nothing at the moment. I will check this further.

-Akhil.

> 
> Konrad