iommu/io-pgtable-dart: Add 4-level page table support

Browse source

DARTs on t602x SoCs are of the t8110 variant but have an IAS of 42,
which means optional support for an extra page table level.

Refactor the PTE management to support an arbitrary level count, and
then calculate how many levels we need for any given configuration.

Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Janne Grunau <j@jannau.net>
Reviewed-by: Sven Peter <sven@kernel.org>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Link: https://lore.kernel.org/r/20250821-apple-dart-4levels-v2-2-e39af79daa37@jannau.net
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

...

This commit is contained in:

Hector Martin 2025-08-21 12:15:59 +02:00 • committed by Joerg Roedel

parent 1268890086

commit 74a0e72f03

2 changed files with 87 additions and 53 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

143

drivers/iommu/io-pgtable-dart.c

View file

1

include/linux/io-pgtable.h

View file