Messages in this thread |  | | | Date | Mon, 5 Jan 2009 18:26:08 +0100 | | From | Joerg Roedel <> | | Subject | Re: [PATCH 1/8] add map_page and unmap_page to struct dma_mapping_ops |
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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@lab.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.
Joerg
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