linux-kernel - RE: [PATCH v7 3/3] iommu/arm-smmu: Add global/context fault implementation hooks

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Message-ID: <BYAPR12MB2822A3F6C11C5A8EFB2DEC48B36E0@BYAPR12MB2822.namprd12.prod.outlook.com>
Date:   Mon, 29 Jun 2020 23:28:19 +0000
From:   Krishna Reddy <vdumpa@...dia.com>
To:     Nicolin Chen <nicoleotsuka@...il.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 3/3] iommu/arm-smmu: Add global/context fault
 implementation hooks

>> +static irqreturn_t nvidia_smmu_context_fault_bank(int irq,

>> +     void __iomem *cb_base = nvidia_smmu_page(smmu, inst, 
>> + smmu->numpage + idx);
[...]
>> +     fsr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSR);
[...]
>> +     writel_relaxed(fsr, cb_base + ARM_SMMU_CB_FSR);

>It reads FSR of the default inst (1st), but clears the FSR of corresponding inst -- just want to make sure that this is okay and intended.

FSR should be read from corresponding inst. Not from instance 0. 
Let me post updated patch.

-KR