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Tue, 26 Sep 2023 08:26:31 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1778117830878530193 X-GMAIL-MSGID: 1778117830878530193 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: a5bf3cfce8cb ("iommu: Implement of_iommu_get_resv_regions()") Signed-off-by: Laurentiu Tudor Reviewed-by: Jason Gunthorpe Acked-by: Thierry Reding --- Changes in v3: - added Acked-by tag (Thierry) Changes in v2: - added Reviewed-by tag (Jason) drivers/iommu/of_iommu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index 157b286e36bf..5b3631ba5a45 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -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);