Xen devel - Mar 2007 - [PATCH][retry 2] Make x86_64 swiotlb code to support dma_ops [2/2]

As per Keir''s and Jan''s suggestions, I''m simplifying 
my approach to getting GART into the kernel.  This 
patch set makes the x86_64 swiotlb code work with 
dma_ops.

The first patch creates the 
arch/x86_64/kernel/pci-dma-xen.c file based on the 
standard pci-dma.c.

The second patch modifies 
arch/x86_64/kernel/pci-swiotlb-xen.c to work with 
dma_ops, and modifies arch/x86_64/kernel/pci-dma-xen.c
slightly to be Xen-safe by copying over some functions
from arch/i386/kernel/pci-dma-xen.c

Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>

-Mark Langsdorf
AMD, Inc.


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>The second patch modifies 
>arch/x86_64/kernel/pci-swiotlb-xen.c to work with 
>dma_ops, and modifies arch/x86_64/kernel/pci-dma-xen.c
>slightly to be Xen-safe by copying over some functions
>from arch/i386/kernel/pci-dma-xen.c
The removal of sync_single_range_for_{cpu,device} from swiotlb_dma_ops
cannot work in my opinion, as this is not a no-op. You will need to either
touch Xen''s swiotlb.c to add this function, or clone the i386 stubs
that map
dma_sync_single_range_for_ to dma_sync_single_for_ (perhaps into an
''else if'' in the existing functions in
asm-x86_64/mach-xen/asm/dma-mapping.h.

Jan

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