linux-kernel - Re: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page

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Date:	Tue, 06 Oct 2015 14:43:36 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	Keith Busch <keith.busch@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	David Gibson <david@...son.dropbear.id.au>,
	Christoph Hellwig <hch@...radead.org>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API

On Fri, 2015-10-02 at 13:11 -0700, Nishanth Aravamudan wrote:
> Drivers like NVMe need to be able to determine the page size used for
> DMA transfers. Add a new API that defaults to return PAGE_SHIFT on all
> architectures.
> 
> Signed-off-by: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
> 
> diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h
> index b1bc954..86e4e97 100644
> --- a/include/asm-generic/dma-mapping-common.h
> +++ b/include/asm-generic/dma-mapping-common.h
> @@ -355,4 +355,11 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
>  }
>  #endif
>  
> +#ifndef HAVE_ARCH_DMA_GET_PAGE_SHIFT
> +static inline unsigned long dma_get_page_shift(struct device *dev)
> +{
> +	return PAGE_SHIFT;
> +}
> +#endif
> +
>  #endif
> 

Adding Arnd who is asm-generic maintainer.

Arnd/Christoph can one of you give us an ack for this patch?

cheers


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