linux-kernel - Re: [PATCH v10 5/5] iommu/arm-smmu: Add global/context fault implementation hooks

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Message-ID: <20200713134450.GC2739@willie-the-truck>
Date:   Mon, 13 Jul 2020 14:44:51 +0100
From:   Will Deacon <will@...nel.org>
To:     Krishna Reddy <vdumpa@...dia.com>
Cc:     joro@...tes.org, robin.murphy@....com, robh+dt@...nel.org,
        treding@...dia.com, jonathanh@...dia.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, yhsu@...dia.com, snikam@...dia.com,
        praithatha@...dia.com, talho@...dia.com, bbiswas@...dia.com,
        mperttunen@...dia.com, nicolinc@...dia.com, bhuntsman@...dia.com,
        nicoleotsuka@...il.com
Subject: Re: [PATCH v10 5/5] iommu/arm-smmu: Add global/context fault
 implementation hooks

On Tue, Jul 07, 2020 at 10:00:17PM -0700, Krishna Reddy wrote:
> Add global/context fault hooks to allow vendor specific implementations
> override default fault interrupt handlers.
> 
> Update NVIDIA implementation to override the default global/context fault
> interrupt handlers and handle interrupts across the two ARM MMU-500s that
> are programmed identically.
> 
> Signed-off-by: Krishna Reddy <vdumpa@...dia.com>
> ---
>  drivers/iommu/arm-smmu-nvidia.c | 99 +++++++++++++++++++++++++++++++++
>  drivers/iommu/arm-smmu.c        | 17 +++++-
>  drivers/iommu/arm-smmu.h        |  3 +
>  3 files changed, 117 insertions(+), 2 deletions(-)

Given that faults shouldn't occur during normal operation, is this patch
actually necessary?

Will