linux-kernel - Re: [PATCH v3 3/4] iommu/arm-smmu: Add support to handle Qcom's wait-for-safe logic

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Message-ID: <20190626144844.key3n6ueb6skgkp4@willie-the-truck>
Date:   Wed, 26 Jun 2019 15:48:45 +0100
From:   Will Deacon <will@...nel.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Will Deacon <will.deacon@....com>,
        open list <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Brown <david.brown@...aro.org>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <iommu@...ts.linux-foundation.org>,
        robh+dt <robh+dt@...nel.org>, Andy Gross <agross@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v3 3/4] iommu/arm-smmu: Add support to handle Qcom's
 wait-for-safe logic

On Wed, Jun 26, 2019 at 12:03:02PM +0530, Vivek Gautam wrote:
> On Tue, Jun 25, 2019 at 7:09 PM Will Deacon <will@...nel.org> wrote:
> >
> > On Tue, Jun 25, 2019 at 12:34:56PM +0530, Vivek Gautam wrote:
> > > On Mon, Jun 24, 2019 at 10:33 PM Will Deacon <will@...nel.org> wrote:
> > > > Instead, I think this needs to be part of a separate file that is maintained
> > > > by you, which follows on from the work that Krishna is doing for nvidia
> > > > built on top of Robin's prototype patches:
> > > >
> > > > http://linux-arm.org/git?p=linux-rm.git;a=shortlog;h=refs/heads/iommu/smmu-impl
> > >
> > > Looking at this branch quickly, it seem there can be separate implementation
> > > level configuration file that can be added.
> > > But will this also handle separate page table ops when required in future.
> >
> > Nothing's set in stone, but having the implementation-specific code
> > constrain the page-table format (especially wrt quirks) sounds reasonable to
> > me. I'm currently waiting for Krishna to respin the nvidia changes [1] on
> > top of this so that we can see how well the abstractions are holding up.
> 
> Sure. Would you want me to try Robin's branch and take out the qualcomm
> related stuff to its own implementation? Or, would you like me to respin this
> series so that you can take it in to enable SDM845 boards such as, MTP
> and dragonboard to have a sane build - debian, etc. so people benefit
> out of it.

I can't take this series without Acks on the firmware calling changes, and I
plan to send my 5.3 patches to Joerg at the end of the week so they get some
time in -next. In which case, I think it may be worth you having a play with
the branch above so we can get a better idea of any additional smmu_impl hooks
you may need.

> Qualcomm stuff is lying in qcom-smmu and arm-smmu and may take some
> time to stub out the implementation related details.

Not sure I follow you here. Are you talking about qcom_iommu.c?

Will