Re: [PATCH v3 1/2] swiotlb-xen: implement xen_swiotlb_dma_mmap callback

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Jan 31, 2017 at 08:30:25PM +0200, Andrii Anisov wrote:
> From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> 
> This function creates userspace mapping for the DMA-coherent memory.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
> Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
> ---
>  arch/arm/xen/mm.c         |  1 +
>  drivers/xen/swiotlb-xen.c | 18 ++++++++++++++++++
>  include/xen/swiotlb-xen.h |  5 +++++
>  3 files changed, 24 insertions(+)
> 
> diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
> index bd62d94..cd1684e 100644
> --- a/arch/arm/xen/mm.c
> +++ b/arch/arm/xen/mm.c
> @@ -198,6 +198,7 @@ static struct dma_map_ops xen_swiotlb_dma_ops = {
>  	.unmap_page = xen_swiotlb_unmap_page,
>  	.dma_supported = xen_swiotlb_dma_supported,
>  	.set_dma_mask = xen_swiotlb_set_dma_mask,
> +	.mmap = xen_swiotlb_dma_mmap,
>  };
>  
>  int __init xen_mm_init(void)
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index f8afc6d..8ac36b4 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -681,3 +681,21 @@ xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask)
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(xen_swiotlb_set_dma_mask);
> +
> +/*
> + * Create userspace mapping for the DMA-coherent memory.
> + * Following function should be called with the local pages only.

What does 'local pages' mean?

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