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

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Date:   Mon, 27 Mar 2023 13:52:01 +0100
From:   Will Deacon <will@...nel.org>
To:     joro@...tes.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, 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, 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!

[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