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

[Will Deacon]

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@xxxxxxxxx