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

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Date:   Thu, 30 Mar 2023 16:06:41 +0100
From:   Will Deacon <will@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.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 Thu, Mar 30, 2023 at 11:11:27AM +0530, Manivannan Sadhasivam wrote:
> 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.

I already queued this up for 6.4 since it's neither a regression
nor marked for stable inclusion.

Having said that, once it lands in mainline feel free to propose a
-stable backport if it's needed by distros.

Will