aboutsummaryrefslogtreecommitdiff
path: root/include/linux/iommu-helper.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/iommu-helper.h')
-rw-r--r--include/linux/iommu-helper.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h
index c975caf7538..58f41107e4a 100644
--- a/include/linux/iommu-helper.h
+++ b/include/linux/iommu-helper.h
@@ -1,3 +1,13 @@
+static inline unsigned long iommu_device_max_index(unsigned long size,
+ unsigned long offset,
+ u64 dma_mask)
+{
+ if (size + offset > dma_mask)
+ return dma_mask - offset + 1;
+ else
+ return size;
+}
+
extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
unsigned long shift,
unsigned long boundary_size);