linux-kernel - Re: [PATCH 0/3] iommu/arm-smmu: Qualcomm bootsplash/efifb

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Date:   Mon, 24 May 2021 13:48:25 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Lee Jones <lee.jones@...aro.org>, Will Deacon <will@...nel.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        iommu@...ts.linux-foundation.org,
        open list <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Patrick Daly <pdaly@...eaurora.org>,
        Pratik Patel <pratikp@...eaurora.org>,
        Rob Clark <robdclark@...il.com>,
        Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH 0/3] iommu/arm-smmu: Qualcomm bootsplash/efifb

On 2021-05-24 13:03, Lee Jones wrote:
> On Wed, 8 Jan 2020 at 09:16, Will Deacon <will@...nel.org> wrote:
> 
>> On Thu, Dec 26, 2019 at 02:17:06PM -0800, Bjorn Andersson wrote:
>>> These patches implements the stream mapping inheritance that's necessary
>> in
>>> order to not hit a security violation as the display hardware looses its
>> stream
>>> mapping during initialization of arm-smmu in various Qualcomm platforms.
>>>
>>> This was previously posted as an RFC [1], changes since then involves the
>>> rebase and migration of the read-back code to the Qualcomm specific
>>> implementation, the mapping is maintained indefinitely - to handle probe
>>> deferring clients - and rewritten commit messages.
>>
>> I don't think we should solve this in a Qualcomm-specific manner. Please
>> can
>> you take a look at the proposal from Thierry [1] and see whether or not it
>> works for you?
>>
> 
> Did this or Thierry's solution ever gain traction?
> 
> Or are all the parties still 'solving' this downstream?

I think this particular series is what eventually ended up upstream as 
07a7f2caaa5a and f9081b8ff593 (plus a couple of tweaks later). Progress 
is slow on the more general solution, but still happening - I see there 
was a new version recently which I've not had time to properly look at yet.

Robin.