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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-09-12 19:42:33 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-14 16:42:36 +0200 |
| commit | eecfffc154ffbfe70686a9905c090b488778c28e (patch) | |
| tree | 3bcbd7e67d198680fd16b217af2d78b59bba36c8 | |
| parent | 6e03f99803195e5aaf7f247db31b0d11857ccc35 (diff) | |
iommu: add iommu_device_max_index IOMMU helper function
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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | 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 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); |