From: Sven Peter <sven@svenpeter.dev>
To: iommu@lists.linux-foundation.org
Cc: Sven Peter <sven@svenpeter.dev>, Joerg Roedel <joro@8bytes.org>,
Will Deacon <will@kernel.org>, Rob Herring <robh+dt@kernel.org>,
Janne Grunau <j@jannau.net>, Hector Martin <marcan@marcan.st>,
Robin Murphy <robin.murphy@arm.com>,
Alyssa Rosenzweig <alyssa@rosenzweig.io>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/4] iommu: M1 Pro/Max DART support
Date: Wed, 17 Nov 2021 22:15:05 +0100 [thread overview]
Message-ID: <20211117211509.28066-1-sven@svenpeter.dev> (raw)
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
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next reply other threads:[~2021-11-17 21:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-17 21:15 Sven Peter [this message]
2021-11-17 21:15 ` [PATCH 1/4] dt-bindings: iommu: dart: add t6000 compatible Sven Peter
2021-11-29 22:50 ` Rob Herring
2021-11-17 21:15 ` [PATCH 2/4] iommu/io-pgtable: Add DART subpage protection support Sven Peter
2021-11-17 21:15 ` [PATCH 3/4] iommu/io-pgtable: Add DART PTE support for t6000 Sven Peter
2021-11-17 21:15 ` [PATCH 4/4] iommu: dart: Support t6000 variant Sven Peter
2021-11-30 20:56 ` [PATCH 0/4] iommu: M1 Pro/Max DART support Janne Grunau
2021-12-06 12:07 ` Joerg Roedel
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