From 74a0e72f03ffd01b5d88b411f02d9b9861fdb99e Mon Sep 17 00:00:00 2001 From: Hector Martin Date: Thu, 21 Aug 2025 12:15:59 +0200 Subject: iommu/io-pgtable-dart: Add 4-level page table support 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 Signed-off-by: Janne Grunau Reviewed-by: Sven Peter Reviewed-by: Neal Gompa Link: https://lore.kernel.org/r/20250821-apple-dart-4levels-v2-2-e39af79daa37@jannau.net Signed-off-by: Joerg Roedel --- include/linux/io-pgtable.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/io-pgtable.h') diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index 138fbd89b1e6..8a823c6f2b4a 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -180,6 +180,7 @@ struct io_pgtable_cfg { struct { u64 ttbr[4]; u32 n_ttbrs; + u32 n_levels; } apple_dart_cfg; struct { -- cgit v1.2.3