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

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Date:   Wed, 8 Jan 2020 09:16:42 +0000
From:   Will Deacon <will@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Patrick Daly <pdaly@...eaurora.org>,
        Pratik Patel <pratikp@...eaurora.org>,
        Rob Clark <robdclark@...il.com>, treding@...dia.com
Subject: Re: [PATCH 0/3] iommu/arm-smmu: Qualcomm bootsplash/efifb

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?

Thanks,

Will

[1] https://lore.kernel.org/lkml/20191209150748.2471814-1-thierry.reding@gmail.com