linux-kernel - Re: [PATCH] drm/msm: Wire up tlb ops

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Date: Thu, 15 Feb 2024 07:28:53 -0800
From: Rob Clark <robdclark@...il.com>
To: Johan Hovold <johan@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-arm-msm@...r.kernel.org, Rob Clark <robdclark@...omium.org>, 
	Robin Murphy <robin.murphy@....com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Bjorn Andersson <andersson@...nel.org>, 
	Jordan Crouse <jordan@...micpenguin.net>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm: Wire up tlb ops

On Wed, Feb 14, 2024 at 11:34 PM Johan Hovold <johan@...nel.org> wrote:
>
> On Tue, Feb 13, 2024 at 09:23:40AM -0800, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> >
> > The brute force iommu_flush_iotlb_all() was good enough for unmap, but
> > in some cases a map operation could require removing a table pte entry
> > to replace with a block entry.  This also requires tlb invalidation.
> > Missing this was resulting an obscure iova fault on what should be a
> > valid buffer address.
> >
> > Thanks to Robin Murphy for helping me understand the cause of the fault.
> >
> > Cc: Robin Murphy <robin.murphy@....com>
> > Fixes: b145c6e65eb0 ("drm/msm: Add support to create a local pagetable")
>
> Sounds like you're missing a
>
> Cc: stable@...r.kernel.org
>
> here? Or is there some reason not to backport this fix (to 5.9 and later
> kernels)?

No reason, I just expected the Fixes tag was sufficient

BR,
-R

> > Signed-off-by: Rob Clark <robdclark@...omium.org>
>
> Johan