[PATCH 5/5] powerpc: Add 86xx support for SWIOTLB
beckyb at kernel.crashing.org
Tue Apr 21 03:58:09 EST 2009
On Apr 20, 2009, at 12:00 PM, Kumar Gala wrote:
> On Apr 20, 2009, at 11:26 AM, Becky Bruce wrote:
>> Minor code to allow enabling swiotlb on mpc86xx, including
>> Kconfig addition for SWIOTLB.
>> Signed-off-by: Becky Bruce <beckyb at kernel.crashing.org>
>> arch/powerpc/Kconfig | 10 ++++++++++
>> arch/powerpc/kernel/dma-swiotlb.c | 2 ++
>> arch/powerpc/platforms/86xx/mpc86xx_hpcn.c | 3 +++
>> 3 files changed, 15 insertions(+), 0 deletions(-)
>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
>> index 197f6a3..e47c81d 100644
>> --- a/arch/powerpc/Kconfig
>> +++ b/arch/powerpc/Kconfig
>> @@ -292,6 +292,16 @@ config IOMMU_VMERGE
>> config IOMMU_HELPER
>> def_bool PPC64
>> +config SWIOTLB
>> + bool "SWIOTLB support"
>> + depends on PPC_86xx
>> + select IOMMU_HELPER
>> + ---help---
>> + Support for IO bounce buffering for systems without an IOMMU.
>> + This allows us to DMA to the full physical address space on
>> + platforms where the size of a physical address is larger
>> + than the bus address.
> As stated on previous patch, move the bulk of this into 4/5.
>> config PPC_NEED_DMA_SYNC_OPS
>> def_bool y
>> depends on (NOT_COHERENT_CACHE || SWIOTLB)
>> diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/
>> index 29a68e6..3065d03 100644
>> --- a/arch/powerpc/kernel/dma-swiotlb.c
>> +++ b/arch/powerpc/kernel/dma-swiotlb.c
>> @@ -159,3 +159,5 @@ static int __init setup_bus_notifier(void)
>> return 0;
>> +machine_arch_initcall(mpc86xx_hpcn, setup_bus_notifier);
> Hmm, not sure what we chatted about here, but I don't want to have
> to add every board into this file to register the bus notifiers.
We talked about this, and this was what we decided on - I don't really
like the idea, either, but there's a lot of precedent for it. I'd
like to do this differently, but I"m not sure what the solution is -
we'd need to look into that more (or perhaps someone here will have
some sage advice).
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