linux-kernel - Re: [PATCH v2 1/1] iommu/arm-smmu: Log CBFRSYNRA register on context fault

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Message-ID: <20190423111938.GB3439@fuggles.cambridge.arm.com>
Date:   Tue, 23 Apr 2019 12:19:38 +0100
From:   Will Deacon <will.deacon@....com>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     joro@...tes.org, robin.murphy@....com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, bjorn.andersson@...aro.org
Subject: Re: [PATCH v2 1/1] iommu/arm-smmu: Log CBFRSYNRA register on context
 fault

On Mon, Apr 22, 2019 at 12:40:36PM +0530, Vivek Gautam wrote:
> Bits[15:0] in CBFRSYNRA register contain information about
> StreamID of the incoming transaction that generated the
> fault. Dump CBFRSYNRA register to get this info.
> This is specially useful in a distributed SMMU architecture
> where multiple masters are connected to the SMMU.
> SID information helps to quickly identify the faulting
> master device.
> 
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> 
> Changes since v1:
>  - Addressed review comments, given by Bjorn, for nits.

Thanks, applied with minor fixup from Robin and Acks.

Will