Commit f1aad9df authored by Laurentiu Tudor's avatar Laurentiu Tudor Committed by Joerg Roedel
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iommu: Map reserved memory as cacheable if device is coherent 



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: a5bf3cfc ("iommu: Implement of_iommu_get_resv_regions()")
Signed-off-by: default avatarLaurentiu Tudor <laurentiu.tudor@nxp.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Acked-by: default avatarThierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20230926152600.8749-1-laurentiu.tudor@nxp.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 2cc14f52

drivers/iommu/of_iommu.c

+3 −0
Original line number Diff line number Diff line
@@ -254,6 +254,9 @@ void of_iommu_get_resv_regions(struct device *dev, struct list_head *list) 
				phys_addr_t iova;

				size_t length;



				if (of_dma_is_coherent(dev->of_node))

					prot |= IOMMU_CACHE;



				maps = of_translate_dma_region(np, maps, &iova, &length);

				type = iommu_resv_region_get_type(dev, &phys, iova, length);