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iommu: Explicitly skip bus address marked segments in __iommu_map_sg() 

In order to support PCI P2PDMA mappings with dma-iommu, explicitly skip
any segments marked with sg_dma_mark_bus_address() in __iommu_map_sg().

These segments should not be mapped into the IOVA and will be handled
separately in as subsequent patch for dma-iommu.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Logan Gunthorpe 2022-07-08 10:50:58 -06:00 committed by Christoph Hellwig
parent 159bf19270
commit c96321834b
1 changed files with 4 additions and 0 deletions
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4
drivers/iommu/iommu.c
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@ -2457,6 +2457,9 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
len = 0;
}
if (sg_is_dma_bus_address(sg))
goto next;
if (len) {
len += sg->length;
} else {
@ -2464,6 +2467,7 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
start = s_phys;
}
next:
if (++i < nents)
sg = sg_next(sg);
}