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Subject[PATCH 6/6] sparc64: Enable 64-bit DMA
Date
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>
---
arch/sparc/Kconfig | 4 ++++
arch/sparc/kernel/iommu.c | 8 ++++++--
2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index a7482bc..99bb845 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -94,6 +94,10 @@ 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
diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c
index 5c615ab..852a329 100644
--- a/arch/sparc/kernel/iommu.c
+++ b/arch/sparc/kernel/iommu.c
@@ -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;
--
1.9.1
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