linux-kernel - Re: [PATCH v1 7/7] iommu/arm-smmu-v3: Move CD table to arm_smmu

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Date:   Thu, 27 Jul 2023 15:43:31 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Michael Shavit <mshavit@...gle.com>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>, jean-philippe@...aro.org,
        nicolinc@...dia.com, baolu.lu@...ux.intel.com,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 7/7] iommu/arm-smmu-v3: Move CD table to
 arm_smmu_master

On Fri, Jul 28, 2023 at 02:26:23AM +0800, Michael Shavit wrote:
> Each master is now allocated a CD table at probe time,

Currently it is allocated during arm_smmu_domain_finalise_s1(), so it
isn't allocated at probe time.

I think the right place to put the allocation is during the attach op,
the first time we need a CD table then go and allocate it. If we can't
then domain attach fails with -ENOMEM.

Then you can put the free in a detach op once the CD table becomes
empty and it behaves much like it already does.

Jason