Messages in this thread Patch in this message |  | | | From | FUJITA Tomonori <> | | Subject | [PATCH 1/3] add iommu_device_max_index IOMMU helper function | | Date | Fri, 12 Sep 2008 19:42:33 +0900 | |
This function helps IOMMUs to know the highest address that a device
can access to.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
include/linux/iommu-helper.h | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h
index c975caf..58f4110 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);
--
1.5.5.GIT
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