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| author | Tushar Dave <tushar.n.dave@oracle.com> | 2016-10-28 10:12:45 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-18 11:17:00 -0800 |
| commit | d30a6b84df00128e03588564925dc828a53e6865 (patch) | |
| tree | 9aa3298173c5cc35683d8e01259e856e1ae84921 /arch/sparc | |
| parent | f08978b0fdbf37d3c91efb60a20bdee3ba8f59c6 (diff) | |
| download | lwn-d30a6b84df00128e03588564925dc828a53e6865.tar.gz lwn-d30a6b84df00128e03588564925dc828a53e6865.zip | |
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>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/Kconfig | 4 | ||||
| -rw-r--r-- | arch/sparc/kernel/iommu.c | 8 |
2 files changed, 10 insertions, 2 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 5202eb4ba2db..60145c9b9f84 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -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 diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c index 5c615abff030..852a3291db96 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; |