[PATCH v3 03/10] arm: make SWIOTLB available
From: Konrad Rzeszutek Wilk <hidden>
Date: 2013-08-09 15:30:58
Also in:
lkml, xen-devel
On Mon, Aug 05, 2013 at 05:30:49PM +0100, Stefano Stabellini wrote:
IOMMU_HELPER is needed because SWIOTLB calls iommu_is_span_boundary, provided by lib/iommu_helper.c. Signed-off-by: Stefano Stabellini <redacted>
And Reviewed-by: Konrad Rzeszutek Wilk [off-list ref] Thanks.
quoted hunk ↗ jump to hunk
CC: will.deacon at arm.com CC: linux at arm.linux.org.uk Changes in v3: - dma_capable: do not treat dma_mask as a limit; - remove SWIOTLB dependency on NEED_SG_DMA_LENGTH. --- arch/arm/Kconfig | 6 ++++++ arch/arm/include/asm/dma-mapping.h | 30 ++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+), 0 deletions(-)diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index ba412e0..c0bfb33 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig@@ -1832,6 +1832,12 @@ config CC_STACKPROTECTOR neutralized via a kernel panic. This feature requires gcc version 4.2 or above. +config SWIOTLB + def_bool y + +config IOMMU_HELPER + def_bool SWIOTLB + config XEN_DOM0 def_bool y depends on XENdiff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 5b579b9..5b8eef9 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h@@ -86,6 +86,36 @@ static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) } #endif +static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) +{ + unsigned int offset = paddr & ~PAGE_MASK; + return pfn_to_dma(dev, paddr >> PAGE_SHIFT) + offset; +} + +static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) +{ + unsigned int offset = dev_addr & ~PAGE_MASK; + return (dma_to_pfn(dev, dev_addr) << PAGE_SHIFT) + offset; +} + +static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) +{ + u64 limit, mask = *dev->dma_mask; + + limit = (mask + 1) & ~mask; + if (limit && size > limit) + return 0; + + if ((addr | (addr + size - 1)) & ~mask) + return 0; + + return 1; +} + +static inline void dma_mark_clean(void *addr, size_t size) +{ +} + /* * DMA errors are defined by all-bits-set in the DMA address. */-- 1.7.2.5