linux-kernel - Re: [PATCH 4/6] iommu/qcom: Add support for AArch64 IOMMU pagetables

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Date:   Thu, 2 Jun 2022 09:17:33 -0500
From:   Rob Herring <robh@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        linux-arm-msm@...r.kernel.org, bjorn.andersson@...aro.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Andy Gross <agross@...nel.org>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] iommu/qcom: Add support for AArch64 IOMMU pagetables

On Fri, May 27, 2022 at 11:28:59PM +0200, Konrad Dybcio wrote:
> From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> 
> Some IOMMUs associated with some TZ firmwares may support switching
> to the AArch64 pagetable format by sending a "set pagetable format"
> scm command indicating the IOMMU secure ID and the context number
> to switch.
> 
> Add a DT property "qcom,use-aarch64-pagetables" for this driver to
> send this command to the secure world and to switch the pagetable
> format to benefit of the ARM64 IOMMU pagetables, where possible.
> 
> Note that, even though the command should be valid to switch each
> context, the property is made global because:
> 1. It doesn't make too much sense to switch only one or two
>    context(s) to AA64 instead of just the entire thing
> 2. Some IOMMUs will go crazy and produce spectacular results when
>    trying to mix up the pagetables on a per-context basis.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> ---
>  .../devicetree/bindings/iommu/qcom,iommu.txt  |  2 +

Bindings should be separate patch.

As you are making multiple changes, please convert this to DT schema 
first.

>  drivers/iommu/arm/arm-smmu/qcom_iommu.c       | 54 +++++++++++++++----
>  2 files changed, 47 insertions(+), 9 deletions(-)