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iommu/dma: add a new dma_map_ops of get_merge_boundary()

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This patch adds a new dma_map_ops of get_merge_boundary() to
expose the DMA merge boundary if the domain type is IOMMU_DOMAIN_DMA.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Yoshihiro Shimoda 2019-08-28 21:35:41 +09:00 committed by Christoph Hellwig
parent 6ba99411b8
commit 158a6d3ce3
1 changed files with 8 additions and 0 deletions
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8
drivers/iommu/dma-iommu.c
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@ -1086,6 +1086,13 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
return ret;
}
static unsigned long iommu_dma_get_merge_boundary(struct device *dev)
{
struct iommu_domain *domain = iommu_get_dma_domain(dev);
return (1UL << __ffs(domain->pgsize_bitmap)) - 1;
}
static const struct dma_map_ops iommu_dma_ops = {
.alloc = iommu_dma_alloc,
.free = iommu_dma_free,
@ -1101,6 +1108,7 @@ static const struct dma_map_ops iommu_dma_ops = {
.sync_sg_for_device = iommu_dma_sync_sg_for_device,
.map_resource = iommu_dma_map_resource,
.unmap_resource = iommu_dma_unmap_resource,
.get_merge_boundary = iommu_dma_get_merge_boundary,
};
/*