iommu: Map reserved memory as cacheable if device is coherent

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[ Upstream commit f1aad9df93 ]

Check if the device is marked as DMA coherent in the DT and if so,
map its reserved memory as cacheable in the IOMMU.
This fixes the recently added IOMMU reserved memory support which
uses IOMMU_RESV_DIRECT without properly building the PROT for the
mapping.

Fixes: a5bf3cfce8 ("iommu: Implement of_iommu_get_resv_regions()")
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20230926152600.8749-1-laurentiu.tudor@nxp.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Laurentiu Tudor 2023-09-26 18:26:00 +03:00 • committed by Greg Kroah-Hartman

parent 95e4e0031e

commit 1cf24d70d7

1 changed files with 3 additions and 0 deletions

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drivers/iommu/of_iommu.c

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