linux-kernel - Re: [PATCH v2 0/3] iommu/apple-dart: Four level page table support

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Message-ID: <aLrXS9Z-F31SEd_G@8bytes.org>
Date: Fri, 5 Sep 2025 14:27:55 +0200
From: Joerg Roedel <joro@...tes.org>
To: Janne Grunau <j@...nau.net>
Cc: Sven Peter <sven@...nel.org>, Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Neal Gompa <neal@...pa.dev>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>, asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Hector Martin <marcan@...can.st>
Subject: Re: [PATCH v2 0/3] iommu/apple-dart: Four level page table support

On Thu, Aug 21, 2025 at 12:15:57PM +0200, Janne Grunau wrote:
> 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>
> ---
> Changes in v2:
> - simplified 4 page table level use in apple_dart_hw_enable_translation()
> - use "iommu/{apple,io-pgtable}-dart:" as commit subject prefix
> - added Sven's Rb:
> - Link to v1: https://lore.kernel.org/r/20250814-apple-dart-4levels-v1-0-db2214a78c08@jannau.net
> 
> ---
> Hector Martin (3):
>       iommu/apple-dart: Make the hw register fields u32s
>       iommu/io-pgtable-dart: Add 4-level page table support
>       iommu/apple-dart: Add 4-level page table support
> 
>  drivers/iommu/apple-dart.c      |  50 +++++++++-----
>  drivers/iommu/io-pgtable-dart.c | 143 ++++++++++++++++++++++++----------------
>  include/linux/io-pgtable.h      |   1 +
>  3 files changed, 121 insertions(+), 73 deletions(-)

Applied, thanks.