linux-kernel - RE: [PATCH 1/7] iommu/arm-smmu: add Nvidia SMMUv2 implementation

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Message-ID: <BYAPR12MB2710D045303BE89A7D3FF2C1B3BD0@BYAPR12MB2710.namprd12.prod.outlook.com>
Date:   Fri, 30 Aug 2019 18:16:05 +0000
From:   Krishna Reddy <vdumpa@...dia.com>
To:     Robin Murphy <robin.murphy@....com>
CC:     Sachin Nikam <Snikam@...dia.com>,
        "Thomas Zeng (SW-TEGRA)" <thomasz@...dia.com>,
        Juha Tukkinen <jtukkinen@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Pritesh Raithatha <praithatha@...dia.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Timo Alho <talho@...dia.com>, Yu-Huan Hsu <YHsu@...dia.com>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        Thierry Reding <treding@...dia.com>,
        Alexander Van Brunt <avanbrunt@...dia.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "will.deacon@....com" <will.deacon@....com>,
        "joro@...tes.org" <joro@...tes.org>
Subject: RE: [PATCH 1/7] iommu/arm-smmu: add Nvidia SMMUv2 implementation

>> +ARM_SMMU_MATCH_DATA(nvidia_smmuv2, ARM_SMMU_V2, NVIDIA_SMMUV2);

> From the previous discussions, I got the impression that other than the 'novel' way they're integrated, the actual SMMU implementations were unmodified Arm MMU-500s. Is that the case, or have I misread something?

The ARM MMU-500 implementation is unmodified.  It is the way the are integrated and used together(for interleaved accesses) is different from regular ARM MMU-500.
I have added it to get the model number and to be able differentiate the SMMU implementation in arm-smmu-impl.c.

-KR