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powerpc/cell: Add DMA_ATTR_WEAK_ORDERING dma attribute and use in Cell IOMMU code

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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>
This commit is contained in:
Mark Nelson 2008-07-18 23:03:34 +10:00 • committed by Benjamin Herrenschmidt
parent 79e25bac12
commit 1ed6af7344
3 changed files with 118 additions and 5 deletions
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1
include/linux/dma-attrs.h
View file

@ -12,6 +12,7 @@
*/
enum dma_attr {
DMA_ATTR_WRITE_BARRIER,
DMA_ATTR_WEAK_ORDERING,
DMA_ATTR_MAX,
};