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Commit d30a6b84 authored by Tushar Dave's avatar Tushar Dave Committed by David S. Miller
Browse files

sparc64: Enable 64-bit DMA 



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

Signed-off-by: default avatarTushar Dave <tushar.n.dave@oracle.com>
Reviewed-by: default avatarchris hyser <chris.hyser@oracle.com>
Acked-by: default avatarSowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f08978b0

arch/sparc/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -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

arch/sparc/kernel/iommu.c

+6 −2
Original line number Diff line number Diff line
@@ -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))

	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;