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| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2019-08-28 14:35:41 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-09-03 08:33:06 +0200 |
| commit | 158a6d3ce3bcfcd6e6650f80b16efcf64f8b6bf8 (patch) | |
| tree | d5d2e854384b34335448ae1458e24602c7f8337a /drivers/iommu/dma-iommu.c | |
| parent | dma-mapping: introduce dma_get_merge_boundary() (diff) | |
| download | linux-158a6d3ce3bcfcd6e6650f80b16efcf64f8b6bf8.tar.xz linux-158a6d3ce3bcfcd6e6650f80b16efcf64f8b6bf8.zip | |
iommu/dma: add a new dma_map_ops of get_merge_boundary()
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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index f68a62c3c32b..ef407e4eccde 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -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, }; /* |