linux-kernel - Re: [PATCH v3 2/8] dma-mapping: add {map,unmap}_resource to dma_map

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Date:	Thu, 11 Feb 2016 02:03:40 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Niklas Söderlund 
	<niklas.soderlund+renesas@...natech.se>
Cc:	linux-renesas-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org, iommu@...ts.linux-foundation.org,
	robin.murphy@....com, vinod.koul@...el.com,
	geert+renesas@...der.be, linus.walleij@...aro.org,
	dan.j.williams@...el.com, arnd@...db.de, linux-arch@...r.kernel.org
Subject: Re: [PATCH v3 2/8] dma-mapping: add {map,unmap}_resource to dma_map_ops

Hi Niklas,

Thank you for the patch.

On Wednesday 10 February 2016 01:57:52 Niklas Söderlund wrote:
> Add methods to handle mapping of device resources from a physical
> address. This is needed for example to map be able to map MMIO FIFO
> registers to a IOMMU.
> 
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

Apart from the typo in the commit message that Sergei already pointed out,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  include/linux/dma-mapping.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
> index 75857cd..e3aba4e 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -49,6 +49,12 @@ struct dma_map_ops {
>  			 struct scatterlist *sg, int nents,
>  			 enum dma_data_direction dir,
>  			 struct dma_attrs *attrs);
> +	dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
> +			       size_t size, enum dma_data_direction dir,
> +			       struct dma_attrs *attrs);
> +	void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
> +			   size_t size, enum dma_data_direction dir,
> +			   struct dma_attrs *attrs);
>  	void (*sync_single_for_cpu)(struct device *dev,
>  				    dma_addr_t dma_handle, size_t size,
>  				    enum dma_data_direction dir);

-- 
Regards,

Laurent Pinchart