linux-kernel - Re: [PATCH v5 2/9] iommu/arm-smmu-v3: Replace s1_cfg with cdtab

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Message-ID: <20230809162749.GA4663@willie-the-truck>
Date:   Wed, 9 Aug 2023 17:27:49 +0100
From:   Will Deacon <will@...nel.org>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Michael Shavit <mshavit@...gle.com>, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        robin.murphy@....com, nicolinc@...dia.com, jean-philippe@...aro.org
Subject: Re: [PATCH v5 2/9] iommu/arm-smmu-v3: Replace s1_cfg with cdtab_cfg

On Wed, Aug 09, 2023 at 01:26:41PM -0300, Jason Gunthorpe wrote:
> On Wed, Aug 09, 2023 at 05:22:54PM +0100, Will Deacon wrote:
> 
> > > > If we want to use 4k leaf tables in some cases, how would you add
> > > > that? Such a change shouldn't need the low-level strtab creation
> > > > code to change.
> > > 
> > > You would modify arm_smmu_ctx_desc_cfg to teach it about the different
> > > format. It would gain some (enum?) member that specifies the CD table
> > > layout and geometry. arm_smmu_get_cd_ste() will interpret that member
> > > and generate the correct STE for the specifc cd table.
> > 
> > Sounds a lot like the existing s1fmt field. Can we keep it?
> 
> If you are OK with the dead code, I don't object. But let's put it in
> the struct arm_smmu_ctx_desc_cfg.

Ok, we have a deal!

Will