linux-kernel - [PATCH 0/3] iommu: apple-dart: Four level page table support

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Message-Id: <20250814-apple-dart-4levels-v1-0-db2214a78c08@jannau.net>
Date: Thu, 14 Aug 2025 10:40:23 +0200
From: Janne Grunau <j@...nau.net>
To: Sven Peter <sven@...nel.org>, Alyssa Rosenzweig <alyssa@...enzweig.io>, 
 Neal Gompa <neal@...pa.dev>, Joerg Roedel <joro@...tes.org>, 
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>
Cc: asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 iommu@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Janne Grunau <j@...nau.net>, Hector Martin <marcan@...can.st>
Subject: [PATCH 0/3] iommu: apple-dart: Four level page table support

The DART instances found in T602x based SoCs (Apple's M2 Pro/Max/Ultra)
indicate an IAS of 42 bit. This results in alloc_io_pgtable_ops()
failing as io-pgtable-dart supports at most 36-bit IAS.
The t8110 DART design supports 4-level page tables. Implement support
for this in io-pgtable-dart and mark DART stream with more than 36-bit
IAS as 4-level page tables.

Signed-off-by: Janne Grunau <j@...nau.net>
---
Hector Martin (3):
      iommu: apple-dart: Make the hw register fields u32s
      iommu: io-pgtable: Add 4-level page table support
      iommu: apple-dart: Add 4-level page table support

 drivers/iommu/apple-dart.c      |  47 ++++++++-----
 drivers/iommu/io-pgtable-dart.c | 143 ++++++++++++++++++++++++----------------
 include/linux/io-pgtable.h      |   1 +
 3 files changed, 118 insertions(+), 73 deletions(-)
---
base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
change-id: 20250811-apple-dart-4levels-8f9ae8ac1347

Best regards,
-- 
Janne Grunau <j@...nau.net>