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...@renesas.com>
Reviewed-by: Simon Horman <horms+rene...@verge.net.au>
Acked-by: Joerg Roedel <jroe...@suse.de>
---
drivers/iommu/dma-iommu.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index de68b4a..ad861bd 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -1091,6 +1091,13 @@ 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,
@@ -1106,6 +1113,7 @@ 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,
};
/*
--
2.7.4
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