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sparc64: Enable 64-bit DMA 

ATU 64bit addressing allows PCIe devices with 64bit DMA capabilities
to use ATU for 64bit DMA.

Signed-off-by: Tushar Dave <tushar.n.dave@oracle.com>
Reviewed-by: chris hyser <chris.hyser@oracle.com>
Acked-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tushar Dave 2016-10-28 10:12:45 -07:00 committed by David S. Miller
parent f08978b0fd
commit d30a6b84df
2 changed files with 10 additions and 2 deletions
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4
arch/sparc/Kconfig
View File

@ -93,6 +93,10 @@ config ARCH_ATU
bool
default y if SPARC64
config ARCH_DMA_ADDR_T_64BIT
bool
default y if ARCH_ATU
config IOMMU_HELPER
bool
default y if SPARC64

8
arch/sparc/kernel/iommu.c
View File

@ -760,8 +760,12 @@ int dma_supported(struct device *dev, u64 device_mask)
struct iommu *iommu = dev->archdata.iommu;
u64 dma_addr_mask = iommu->dma_addr_mask;
if (device_mask >= (1UL << 32UL))
return 0;
if (device_mask > DMA_BIT_MASK(32)) {
if (iommu->atu)
dma_addr_mask = iommu->atu->dma_addr_mask;
else
return 0;
}
if ((device_mask & dma_addr_mask) == dma_addr_mask)
return 1;