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

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Message-ID: <f41beaa18f0ba49c3c6f7552291a0641@codeaurora.org>
Date:   Thu, 07 May 2020 19:44:01 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Will Deacon <will@...nel.org>
Cc:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.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>,
        linux-kernel-owner@...r.kernel.org
Subject: Re: [PATCHv4 4/6] iommu/arm-smmu-qcom: Request direct mapping for
 modem device

Hey WIll,

On 2020-05-07 18:32, Will Deacon wrote:
> 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?

lol, sure I'll re-word ^^ tday

> 
> Will

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