> +#ifdef CONFIG_HAS_DMA_P2P
> +static inline dma_peer_addr_t dma_map_peer_resource_attrs(struct
> device *dev,
> + struct device *peer,
> + struct resource *res,
> + size_t offset,
> + size_t size,
> + enum
> dma_data_direction dir,
> + struct dma_attrs
> *attrs)
> +{
> + struct dma_map_ops *ops = get_dma_ops(dev);
> + dma_peer_addr_t addr;
> +
> + BUG_ON(!valid_dma_direction(dir));
> + BUG_ON(ops->map_peer_resource == NULL);
> + addr = ops->map_peer_resource(dev, peer, res, offset, size, dir,
> + attrs);
> + debug_dma_map_peer_resource(dev, peer, res, offset, size, dir,
> addr);
> +
> + return addr;
> +
With those 'BUG_ON' you need to make sure that every dma_map_ops has
this implemented. That means the calgary_dma_ops, gart_dma_ops, swiotlb_dma_ops,
and xen_swiotlb_dma_ops MUST have something implemented.
Please keep in mind that on one can do 'iommu=soft swiotbl=force' on the
command line which will force the IOMMUs to be ignored and only the
SWIOTLB code will be used.
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