From d30a6b84df00128e03588564925dc828a53e6865 Mon Sep 17 00:00:00 2001 From: Tushar Dave Date: Fri, 28 Oct 2016 10:12:45 -0700 Subject: [PATCH] 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 Reviewed-by: chris hyser Acked-by: Sowmini Varadhan Signed-off-by: David S. Miller --- 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 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; -- 2.20.1