On Wed, Apr 25, 2018 at 11:18:14AM +0200, Thierry Reding wrote:
[...]
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index 8c398fedbbb6..1957938d8c9c 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -2366,6 +2366,21 @@ static void arm_teardown_iommu_dma_ops(struct device *dev)
> arm_iommu_release_mapping(mapping);
> }
>
> +void arch_iommu_detach_device(struct device *dev)
> +{
> + struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
> + const struct dma_map_ops *dma_ops;
> +
> + if (!mapping)
> + return;
> +
> + arm_iommu_release_mapping(mapping);
> + arm_iommu_detach_device(dev);
> +
> + dma_ops = arm_get_dma_map_ops(dev->archdata.dma_coherent);
> + set_dma_ops(dev, dma_ops);
> +}
Oh, the irony! This doesn't actually build and I failed to notice
because I forgot to enable ARM_DMA_USE_IOMMU...
Sorry about that, but I think we can use this as basis to discuss
whether the API is good and I'll make sure to properly test the next
revision before sending it out.
Thierry
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