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authorMark Nelson <markn@au1.ibm.com>2008-07-18 17:03:34 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-22 04:39:36 +0400
commit1ed6af73440c5ec920884bb800685a8cab4ce847 (patch)
tree68a452bd8e9d07e9a28cef63ee3b72e0319635da /include
parent79e25bac124a7d1d7bf966f06dd9398a1b5f3d20 (diff)
downloadlinux-1ed6af73440c5ec920884bb800685a8cab4ce847.tar.xz
powerpc/cell: Add DMA_ATTR_WEAK_ORDERING dma attribute and use in Cell IOMMU code
Introduce a new dma attriblue DMA_ATTR_WEAK_ORDERING to use weak ordering on DMA mappings in the Cell processor. Add the code to the Cell's IOMMU implementation to use this code. Dynamic mappings can be weakly or strongly ordered on an individual basis but the fixed mapping has to be either completely strong or completely weak. This is currently decided by a kernel boot option (pass iommu_fixed=weak for a weakly ordered fixed linear mapping, strongly ordered is the default). Signed-off-by: Mark Nelson <markn@au1.ibm.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/dma-attrs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/dma-attrs.h b/include/linux/dma-attrs.h
index 1677e2bfa00c..71ad34eca6e3 100644
--- a/include/linux/dma-attrs.h
+++ b/include/linux/dma-attrs.h
@@ -12,6 +12,7 @@
*/
enum dma_attr {
DMA_ATTR_WRITE_BARRIER,
+ DMA_ATTR_WEAK_ORDERING,
DMA_ATTR_MAX,
};