linux-kernel - Re: [PATCH 1/8] add map_page and unmap_page to struct dma_mapping

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Message-ID: <20090105172859.GC14298@8bytes.org>
Date:	Mon, 5 Jan 2009 18:28:59 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] add map_page and unmap_page to struct dma_mapping_ops

On Mon, Jan 05, 2009 at 06:26:08PM +0100, Joerg Roedel wrote:
> On Mon, Jan 05, 2009 at 11:47:21PM +0900, FUJITA Tomonori wrote:
> > This patch adds map_page and unmap_page to struct dma_mapping_ops.
> > 
> > This is a preparation of struct dma_mapping_ops unification. We use
> > map_page and unmap_page instead of map_single and unmap_single.
> > 
> > We will remove map_single and unmap_single hooks in the last patch in
> > this patchset.
> > 
> > Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > ---
> >  arch/x86/include/asm/dma-mapping.h |    8 ++++++++
> >  1 files changed, 8 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
> > index e93265c..2f89d2e 100644
> > --- a/arch/x86/include/asm/dma-mapping.h
> > +++ b/arch/x86/include/asm/dma-mapping.h
> > @@ -8,6 +8,7 @@
> >  
> >  #include <linux/kmemcheck.h>
> >  #include <linux/scatterlist.h>
> > +#include <linux/dma-attrs.h>
> >  #include <asm/io.h>
> >  #include <asm/swiotlb.h>
> >  #include <asm-generic/dma-coherent.h>
> > @@ -51,6 +52,13 @@ struct dma_mapping_ops {
> >  	void            (*unmap_sg)(struct device *hwdev,
> >  				struct scatterlist *sg, int nents,
> >  				int direction);
> > +	dma_addr_t	(*map_page)(struct device *dev, struct page *page,
> > +				    unsigned long offset, size_t size,
> > +				    enum dma_data_direction dir,
> > +				    struct dma_attrs *attrs);
> > +	void 		(*unmap_page)(struct device *dev, dma_addr_t dma_handle,
> > +				      size_t size, enum dma_data_direction dir,
> > +				      struct dma_attrs *attrs);
> 
> Why do we need an offset into the page? The name suggests that this
> function maps a whole page so the offset should be irrelevant.

Ah, just saw it. Forget this stupid question :)

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