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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2010-08-11 03:03:25 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-11 17:59:21 +0200
commitc31e74c4c34fa863393c28b95409aee934b4f8e1 (patch)
tree8bff4a33f83457b7fe0f4222def85db9df7b645a /Documentation/DMA-API-HOWTO.txt
parentdma-mapping: remove dma_is_consistent API (diff)
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Documentation: DMA-API-HOWTO.txt: add multiple types of IOMMUs support
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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+++ 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