linux-kernel - Re: [uclinux-dist-devel] [PATCH v2 2/9] blackfin: Provide dma_mmap_coherent() and dma_get

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Date:	Mon, 28 Jan 2013 17:08:37 +0800
From:	Bob Liu <lliubbo@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-arch@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-kernel@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [uclinux-dist-devel] [PATCH v2 2/9] blackfin: Provide
 dma_mmap_coherent() and dma_get_sgtable()

On Sun, Jan 27, 2013 at 6:33 PM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> blackfin/allmodconfig:
>
> drivers/media/v4l2-core/videobuf2-dma-contig.c: In function ‘vb2_dc_mmap’:
> drivers/media/v4l2-core/videobuf2-dma-contig.c:204: error: implicit declaration of function ‘dma_mmap_coherent’
> drivers/media/v4l2-core/videobuf2-dma-contig.c: In function ‘vb2_dc_get_base_sgt’:
> drivers/media/v4l2-core/videobuf2-dma-contig.c:387: error: implicit declaration of function ‘dma_get_sgtable’
>
> For architectures using dma_map_ops, dma_mmap_coherent() and
> dma_get_sgtable() are provided in <asm-generic/dma-mapping-common.h>.
>
> Blackfin does not use dma_map_ops, hence it should implement them as inline
> stubs using dma_common_mmap() and dma_common_get_sgtable().
>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> Cc: uclinux-dist-devel@...ckfin.uclinux.org
> Acked-by: Scott Jiang <scott.jiang.linux@...il.com>

Thanks,
Will be applied to my blackfin arch tree.

> ---
> v2: No changes
> ---
>  arch/blackfin/include/asm/dma-mapping.h |   10 ++++++++++
>  1 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/arch/blackfin/include/asm/dma-mapping.h b/arch/blackfin/include/asm/dma-mapping.h
> index bbf4610..054d9ec 100644
> --- a/arch/blackfin/include/asm/dma-mapping.h
> +++ b/arch/blackfin/include/asm/dma-mapping.h
> @@ -154,4 +154,14 @@ dma_cache_sync(struct device *dev, void *vaddr, size_t size,
>         _dma_sync((dma_addr_t)vaddr, size, dir);
>  }
>
> +/* drivers/base/dma-mapping.c */
> +extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
> +                          void *cpu_addr, dma_addr_t dma_addr, size_t size);
> +extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
> +                                 void *cpu_addr, dma_addr_t dma_addr,
> +                                 size_t size);
> +
> +#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
> +#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
> +
>  #endif                         /* _BLACKFIN_DMA_MAPPING_H */
> --
> 1.7.0.4
>

-- 
Regards,
--Bob
--
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