linux-kernel - Re: [PATCH v7 1/3] iommu/arm-smmu: add NVIDIA implementation for dual ARM MMU-500 usage

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Date:   Mon, 29 Jun 2020 16:52:20 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Krishna Reddy <vdumpa@...dia.com>
Cc:     "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        Thierry Reding <treding@...dia.com>,
        Yu-Huan Hsu <YHsu@...dia.com>,
        Sachin Nikam <Snikam@...dia.com>,
        Pritesh Raithatha <praithatha@...dia.com>,
        Timo Alho <talho@...dia.com>,
        Bitan Biswas <bbiswas@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Nicolin Chen <nicolinc@...dia.com>,
        Bryan Huntsman <bhuntsman@...dia.com>
Subject: Re: [PATCH v7 1/3] iommu/arm-smmu: add NVIDIA implementation for
 dual ARM MMU-500 usage

On Mon, Jun 29, 2020 at 10:49:31PM +0000, Krishna Reddy wrote:
> >> +     if (!nvidia_smmu->bases[0])
> >> +             nvidia_smmu->bases[0] = smmu->base;
> >> +
> >> +     return nvidia_smmu->bases[inst] + (page << smmu->pgshift); }
> 
> >Not critical -- just a nit: why not put the bases[0] in init()?
> 
> smmu->base is not available during nvidia_smmu_impl_init() call. It is set afterwards in arm-smmu.c.
> It can't be avoided without changing the devm_ioremap() and impl_init() call order in arm-smmu.c. 

I see...just checked arm_ssmu_impl_init().