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Documentation: DMA-API-HOWTO.txt: add multiple types of IOMMUs support

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Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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FUJITA Tomonori 2010-08-10 18:03:25 -07:00 committed by Linus Torvalds
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commit c31e74c4c3
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Documentation/DMA-API-HOWTO.txt
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@ -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