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 <[email protected]>
And Reviewed-by: Konrad Rzeszutek Wilk <[email protected]> Thanks. > CC: [email protected] > CC: [email protected] > > > 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 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
