linux-kernel - Re: [PATCH 1/6] iommu/qcom: Use the asid read from device-tree if specified

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Message-ID: <CAF6AEGsWsHfQZnszG=NgP0BufxO-DP4LwvsAYkrz2wRhcJuOXw@mail.gmail.com>
Date:   Tue, 31 May 2022 09:15:22 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Will Deacon <will@...nel.org>
Cc:     Konrad Dybcio <konrad.dybcio@...ainline.org>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <iommu@...ts.linux-foundation.org>,
        Martin Botka <martin.botka@...ainline.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        jamipkettunen@...ainline.org, Andy Gross <agross@...nel.org>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Robin Murphy <robin.murphy@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] iommu/qcom: Use the asid read from device-tree if specified

On Tue, May 31, 2022 at 8:46 AM Will Deacon <will@...nel.org> wrote:
>
> On Fri, May 27, 2022 at 11:28:56PM +0200, Konrad Dybcio wrote:
> > From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> >
> > As specified in this driver, the context banks are 0x1000 apart.
> > Problem is that sometimes the context number (our asid) does not
> > match this logic and we end up using the wrong one: this starts
> > being a problem in the case that we need to send TZ commands
> > to do anything on a specific context.
>
> I don't understand this. The ASID is a software construct, so it shouldn't
> matter what we use. If it does matter, then please can you explain why? The
> fact that the context banks are 0x1000 apart seems unrelated.

I think the connection is that mapping from ctx bank to ASID is 1:1

BR,
-R