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| -rw-r--r-- | Documentation/DMA-API-HOWTO.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt index 98ce51796f71..3c4e07123e59 100644 --- a/Documentation/DMA-API-HOWTO.txt +++ b/Documentation/DMA-API-HOWTO.txt @@ -753,6 +753,16 @@ to "Closing". alignment constraints (e.g. the alignment constraints about 64-bit objects). +3) Supporting multiple types of IOMMUs + + If your architecture needs to support multiple types of IOMMUs, you + can use include/linux/asm-generic/dma-mapping-common.h. It's a + library to support the DMA API with multiple types of IOMMUs. Lots + of architectures (x86, powerpc, sh, alpha, ia64, microblaze and + sparc) use it. Choose one to see how it can be used. If you need to + support multiple types of IOMMUs in a single system, the example of + x86 or powerpc helps. + Closing This document, and the API itself, would not be in its current |