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

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 31 Jan 2017, Konrad Rzeszutek Wilk wrote:
> On Tue, Jan 31, 2017 at 08:30:25PM +0200, Andrii Anisov wrote:
> > From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > 
> > This function creates userspace mapping for the DMA-coherent memory.
> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>
> > Signed-off-by: Andrii Anisov <andrii_anisov@xxxxxxxx>
> > ---
> >  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?

A page that belongs to this domain, rather than a foreign page that has
been mapped.

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