linux-kernel - Re: [PATCH 3/3] dma-mapping: move swiotlb dma-phys functions to common header

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Message-ID: <56EBE71F.2080203@arm.com>
Date:	Fri, 18 Mar 2016 11:31:43 +0000
From:	Robin Murphy <robin.murphy@....com>
To:	Sinan Kaya <okaya@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org, timur@...eaurora.org,
	cov@...eaurora.org, nwatters@...eaurora.org
Cc:	linux-mips@...ux-mips.org, linux-ia64@...r.kernel.org,
	linux-xtensa@...ux-xtensa.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Max Filippov <jcmvbkbc@...il.com>,
	Chris Metcalf <cmetcalf@...hip.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Florian Fainelli <f.fainelli@...il.com>, x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Akinobu Mita <akinobu.mita@...il.com>,
	Geliang Tang <geliangtang@....com>,
	Zhen Lei <thunder.leizhen@...wei.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Rothberg <valentinrothberg@...il.com>,
	Chris Zankel <chris@...kel.net>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>,
	"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
	Joe Perches <joe@...ches.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/3] dma-mapping: move swiotlb dma-phys functions to
 common header

On 17/03/16 22:02, Sinan Kaya wrote:
> Moving the default implementation of swiotlb_dma_to_phys and
> swiotlb_phys_to_dma functions to dma-mapping.h so that we can get
> rid of the duplicate code in multiple ARCH.
>
> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
> ---
>   arch/arm64/include/asm/dma-mapping.h               | 14 --------------
>   arch/ia64/include/asm/dma-mapping.h                | 14 --------------
>   arch/mips/include/asm/mach-generic/dma-coherence.h | 16 ----------------
>   arch/tile/include/asm/dma-mapping.h                | 14 --------------
>   arch/unicore32/include/asm/dma-mapping.h           | 14 --------------
>   arch/x86/include/asm/dma-mapping.h                 | 13 -------------
>   arch/xtensa/include/asm/dma-mapping.h              | 14 --------------
>   include/linux/dma-mapping.h                        | 14 ++++++++++++++
>   8 files changed, 14 insertions(+), 99 deletions(-)

[...]

> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
> index 728ef07..871d620 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -683,4 +683,18 @@ static inline int dma_mmap_writecombine(struct device *dev,
>   #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
>   #endif
>
> +#ifndef swiotlb_phys_to_dma
> +static inline dma_addr_t swiotlb_phys_to_dma(struct device *dev, phys_addr_t paddr)
> +{
> +         return paddr;
> +}
> +#endif
> +
> +#ifndef swiotlb_dma_to_phys
> +static inline phys_addr_t swiotlb_dma_to_phys(struct device *dev, dma_addr_t daddr)
> +{
> +        return daddr;
> +}
> +#endif
> +
>   #endif
>

Could the default definition not be pushed all the way down into 
swiotlb.c (or at least swiotlb.h)?

Robin.