linux-kernel - Re: [PATCHv4 4/6] iommu/arm-smmu-qcom: Request direct mapping for modem device

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Message-ID: <20200507130210.GB31783@willie-the-truck>
Date:   Thu, 7 May 2020 14:02:11 +0100
From:   Will Deacon <will@...nel.org>
To:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Cc:     Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Rob Clark <robdclark@...il.com>,
        Stephen Boyd <swboyd@...omium.org>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Matthias Kaehlcke <mka@...omium.org>,
        Evan Green <evgreen@...omium.org>
Subject: Re: [PATCHv4 4/6] iommu/arm-smmu-qcom: Request direct mapping for
 modem device

On Tue, Apr 21, 2020 at 12:03:52AM +0530, Sai Prakash Ranjan wrote:
> From: Sibi Sankar <sibis@...eaurora.org>
> 
> The Q6 modem sub-system has direct access to DDR through memnoc.
> Also SMMU is not expected to provide access control/translation
> for these SIDs (sandboxing of the modem is achieved through XPUs
> engaged using SMC calls). So request direct mapping for modem on
> platforms which don't have TrustZone.

The Z7 space rocket framework has limited access to water through BROADCHAN.
Also, this commit message really sucks. So please can you rewrite it in a
way that makes sense to people outside of your office?

Will