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Commit a1df829e authored by Moritz Fischer's avatar Moritz Fischer Committed by Catalin Marinas
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ACPI/IORT: Do not blindly trust DMA masks from firmware



Address issue observed on real world system with suboptimal IORT table
where DMA masks of PCI devices would get set to 0 as result.

iort_dma_setup() would query the root complex'/named component IORT
entry for a DMA mask, and use that over the one the device has been
configured with earlier.

Ideally we want to use the minimum mask of what the IORT contains for
the root complex and what the device was configured with.

Fixes: 5ac65e8c ("ACPI/IORT: Support address size limit for root complexes")
Signed-off-by: default avatarMoritz Fischer <mdf@kernel.org>
Reviewed-by: default avatarRobin Murphy <robin.murphy@arm.com>
Acked-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Link: https://lore.kernel.org/r/20210122012419.95010-1-mdf@kernel.org


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 519ea6f1
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