linux-kernel - Re: [PATCH v5] iommu/arm-smmu-qcom: Limit the SMR groups to 128

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Date:   Thu, 30 Mar 2023 11:11:27 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Will Deacon <will@...nel.org>
Cc:     joro@...tes.org, catalin.marinas@....com, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, steev@...i.org,
        iommu@...ts.linux.dev, johan+linaro@...nel.org,
        andersson@...nel.org, linux-arm-kernel@...ts.infradead.org,
        robin.murphy@....com
Subject: Re: [PATCH v5] iommu/arm-smmu-qcom: Limit the SMR groups to 128

On Mon, Mar 27, 2023 at 01:52:01PM +0100, Will Deacon wrote:
> On Mon, 27 Mar 2023 13:30:29 +0530, Manivannan Sadhasivam wrote:
> > Some platforms support more than 128 stream matching groups than what is
> > defined by the ARM SMMU architecture specification. But due to some unknown
> > reasons, those additional groups don't exhibit the same behavior as the
> > architecture supported ones.
> > 
> > For instance, the additional groups will not detect the quirky behavior of
> > some firmware versions intercepting writes to S2CR register, thus skipping
> > the quirk implemented in the driver and causing boot crash.
> > 
> > [...]
> 
> Applied to will (for-joerg/arm-smmu/updates), thanks!
> 

Thanks Will! Could you please tag this patch for 6.3-rcS? Even though this patch
is not fixing any issue introduced in 6.3, the affected platform (SC8280XP) has
reasonable upstream support in 6.3 and the distro folks would like to stick to
it for some time. This patch will allow them to boot mainline without any
additional out-of-tree patches.

- Mani

> [1/1] iommu/arm-smmu-qcom: Limit the SMR groups to 128
>       https://git.kernel.org/will/c/122611347326 
> 
> Cheers,
> -- 
> Will
> 
> https://fixes.arm64.dev
> https://next.arm64.dev
> https://will.arm64.dev

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