linux-kernel - [PATCH 0/4] iommu: M1 Pro/Max DART support

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Message-Id: <20211117211509.28066-1-sven@svenpeter.dev>
Date:   Wed, 17 Nov 2021 22:15:05 +0100
From:   Sven Peter <sven@...npeter.dev>
To:     iommu@...ts.linux-foundation.org
Cc:     Sven Peter <sven@...npeter.dev>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Janne Grunau <j@...nau.net>,
        Hector Martin <marcan@...can.st>,
        Robin Murphy <robin.murphy@....com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 0/4] iommu: M1 Pro/Max DART support

Hi,

This is a fairly brief series to add support for the DARTs present in the
M1 Pro/Max. They have two differences that make them incompatible with
those in the M1:

  - the physical addresses are shifted left by 4 bits and and have 2 more
    bits inside the PTE entries
  - the subpage protection feature is now mandatory. For Linux we can
    just configure it to always allow access to the entire page.

Note that this needs a fix to the core pagetable code. Hector already
sent a first version separately to the mailing list since the problem
is (at least in theory) also present on other SoCs using the LPAE format
with a large physical address space [1].

Sven

[1] https://lore.kernel.org/linux-iommu/a2b45243-7e0a-a2ac-4e14-5256a3e7abb4@arm.com/T/#t

Sven Peter (4):
  dt-bindings: iommu: dart: add t6000 compatible
  iommu/io-pgtable: Add DART subpage protection support
  iommu/io-pgtable: Add DART PTE support for t6000
  iommu: dart: Support t6000 variant

 .../devicetree/bindings/iommu/apple,dart.yaml |  4 +-
 drivers/iommu/apple-dart.c                    | 19 ++++++++-
 drivers/iommu/io-pgtable-arm.c                | 40 ++++++++++++++++++-
 include/linux/io-pgtable.h                    |  2 +
 4 files changed, 61 insertions(+), 4 deletions(-)

-- 
2.25.1