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SubjectRe: [PATCH v3 03/10] arm: make SWIOTLB available
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 <stefano.stabellini@eu.citrix.com>

And Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Thanks.
> CC: will.deacon@arm.com
> CC: linux@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 XEN
> diff --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
>


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