iommu/io-pgtable-arm: Fix stage-2 concatenation with 16K

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At the moment, io-pgtable-arm uses concatenation only if it is
possible at level 0, which misses a case where concatenation is
mandatory at level 1 according to R_SRKBC in Arm spec DDI0487 K.a.

Also, that means concatenation can be used when not mandated,
contradicting the comment on the code. However, these cases can only
happen if the SMMUv3 driver is changed to use ias != oas for stage-2.

This patch re-writes the code to use concatenation only if mandatory,
fixing the missing case for level-1 and granule 16K with PA = 40 bits.

Signed-off-by: Mostafa Saleh <smostafa@google.com>
Link: https://lore.kernel.org/r/20241202140604.422235-2-smostafa@google.com
Signed-off-by: Will Deacon <will@kernel.org>

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Mostafa Saleh 2024-12-02 14:06:03 +00:00 • committed by Will Deacon

parent cdfb9840fc

commit 4dcac8407f

1 changed files with 33 additions and 12 deletions

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drivers/iommu/io-pgtable-arm.c

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