powerpc: Override dma_get_required_mask by platform hook and ops

[deliverable/linux.git] / arch / powerpc / kernel / dma-iommu.c

diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
index e7554154a6de8a3567d14bd4a6d06da4c1347688..1f2a711a261e02dddf7c5bd5c62fbe3f022e1266 100644 (file)
--- a/arch/powerpc/kernel/dma-iommu.c
+++ b/arch/powerpc/kernel/dma-iommu.c
@@ -90,6 +90,19 @@ static int dma_iommu_dma_supported(struct device *dev, u64 mask)
                return 1;
 }
 
+u64 dma_iommu_get_required_mask(struct device *dev)
+{
+       struct iommu_table *tbl = get_iommu_table_base(dev);
+       u64 mask;
+       if (!tbl)
+               return 0;
+
+       mask = 1ULL < (fls_long(tbl->it_offset + tbl->it_size) - 1);
+       mask += mask - 1;
+
+       return mask;
+}
+
 struct dma_map_ops dma_iommu_ops = {
        .alloc_coherent = dma_iommu_alloc_coherent,
        .free_coherent  = dma_iommu_free_coherent,