linux-kernel - Re: [PATCH v8 3/3] iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #126

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Message-ID: <20170621181947.GH16981@rric.localdomain>
Date:   Wed, 21 Jun 2017 20:19:47 +0200
From:   Robert Richter <robert.richter@...ium.com>
To:     Geetha sowjanya <gakula@...iumnetworks.com>
Cc:     will.deacon@....com, robin.murphy@....com,
        lorenzo.pieralisi@....com, hanjun.guo@...aro.org,
        sudeep.holla@....com, iommu@...ts.linux-foundation.org,
        robert.moore@...el.com, lv.zheng@...el.com, rjw@...ysocki.net,
        jcm@...hat.com, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, sgoutham@...ium.com,
        linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
        geethasowjanya.akula@...il.com, devel@...ica.org,
        linu.cherian@...ium.com, Charles.Garcia-Tobin@....com,
        robh@...nel.org, Geetha Sowjanya <geethasowjanya.akula@...ium.com>
Subject: Re: [PATCH v8 3/3] iommu/arm-smmu-v3: Add workaround for Cavium
 ThunderX2 erratum #126

On 20.06.17 19:47:39, Geetha sowjanya wrote:
> From: Geetha Sowjanya <geethasowjanya.akula@...ium.com>
> 
> Cavium ThunderX2 SMMU doesn't support MSI and also doesn't have unique irq
> lines for gerror, eventq and cmdq-sync.
> 
> SHARED_IRQ option is set as a errata workaround, which allows to share the irq
> line by register single irq handler for all the interrupts.

I found the entry in silicon-errata.txt missing, is that on purpose?

-Robert

> 
> Signed-off-by: Geetha sowjanya <gakula@...iumnetworks.com>
> ---
>  .../devicetree/bindings/iommu/arm,smmu-v3.txt      |    5 ++
>  drivers/iommu/arm-smmu-v3.c                        |   73 ++++++++++++++++----
>  2 files changed, 64 insertions(+), 14 deletions(-)