linux-kernel - Re: [PATCH v2 7/8] iommu/arm-smmu-v3: Move CD table to arm_smmu

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Message-ID: <ZMkZ1iHPPiF+lLqC@nvidia.com>
Date:   Tue, 1 Aug 2023 11:42:30 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Michael Shavit <mshavit@...gle.com>
Cc:     iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, will@...nel.org,
        robin.murphy@....com, nicolinc@...dia.com, jean-philippe@...aro.org
Subject: Re: [PATCH v2 7/8] iommu/arm-smmu-v3: Move CD table to
 arm_smmu_master

On Mon, Jul 31, 2023 at 06:48:17PM +0800, Michael Shavit wrote:
> With this change, each master will now own its own CD table instead of
> sharing one with other masters attached to the same domain. Attaching a
> stage 1 domain installs CD entries into the master's CD table. SVA
> writes its CD entries into each master's CD table if the domain is
> shared across masters.
> 
> Signed-off-by: Michael Shavit <mshavit@...gle.com>
> ---
> 
> Changes in v2:
> - Allocate CD table when it's first needed instead of on probe.
> 
> Changes in v1:
> - The master's CD table allocation was previously split to a different
>   commit. This change now atomically allocates the new CD table, uses
>   it, and removes the old one.
> 
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 67 +++++++++------------
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  6 +-
>  2 files changed, 32 insertions(+), 41 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason