Re: [PATCH][CFT]: dmaengine: make slave address physical

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On Mon, Feb 22, 2016 at 10:49:08AM +0100, Niklas Söderlund wrote:
> Hi Vinod,
> 
> On 2016-02-21 20:50:46 +0530, Vinod Koul wrote:
> > The slave dmaengine semantics required the client to map dma
> > addresses and pass DMA address to dmaengine drivers. While this
> > was a convenient notion coming from generic dma offload cases
> > where dmaengines are interchangeable and client is not aware of
> > which engine to map to.
> >
> > But in case of slave, we know the dmaengine and always use a
> > specific one. Further the IOMMU cases can lead to failure of this
> > notion, so make this as physical address and now dmaengine driver
> > will do the required mapping.
> 
> Thanks! I have tested this patch with my IOMMU series and it works
> nicely.
> 
> >
> > Original-patch-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> > Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
> 
> Tested-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>

Thanks :)

> 
> > ---
> >  include/linux/dmaengine.h | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> > index 16a1cad30c33..d85ecd20af50 100644
> > --- a/include/linux/dmaengine.h
> > +++ b/include/linux/dmaengine.h
> > @@ -357,8 +357,8 @@ enum dma_slave_buswidth {
> >   */
> >  struct dma_slave_config {
> >  	enum dma_transfer_direction direction;
> > -	dma_addr_t src_addr;
> > -	dma_addr_t dst_addr;
> > +	phys_addr_t src_addr;
> > +	phys_addr_t dst_addr;
> >  	enum dma_slave_buswidth src_addr_width;
> >  	enum dma_slave_buswidth dst_addr_width;
> >  	u32 src_maxburst;
> 
> --
> Regards,
> Niklas Söderlund
> --
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-- 
~Vinod
--
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