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

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On Mon, Feb 22, 2016 at 09:37:10AM +0100, Geert Uytterhoeven wrote:
> Hi Vinod,
> 
> On Sun, Feb 21, 2016 at 4:20 PM, Vinod Koul <vinod.koul@xxxxxxxxx> 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 a lot!
> 
> > Original-patch-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> 
> You've dropped a few ;-)
> 
>     Original-patch-acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
>     Original-patch-acked-by: Arnd Bergmann <arnd@xxxxxxxx>

I never collected those :)
Added now, But will use Arnd latest ack...

> 
> > Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
> 
> Acked-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Thanks, any chance you could test on your boards?

> 
> > ---
> >  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;
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

-- 
~Vinod
--
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