linux-kernel - Re: [RFC PATCH 1/2] common: dma-mapping: introduce dma_get_parent

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Date:	Sun, 21 Dec 2014 10:42:00 +0000
From:	Will Deacon <will.deacon@....com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Murali Karicheri <m-karicheri2@...com>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>
Subject: Re: [RFC PATCH 1/2] common: dma-mapping: introduce
 dma_get_parent_cfg() helper

On Thu, Dec 18, 2014 at 05:20:12PM +0000, Catalin Marinas wrote:
> On Thu, Dec 18, 2014 at 12:09:17AM +0000, Arnd Bergmann wrote:
> > Will, I think we may have a problem on ARM64 now, since we only replaced
> > set_arch_dma_coherent_ops on ARM32 but not ARM64. Can you send a fix for
> > this? Without that, we don't have any coherent operations on ARM64 any
> > more, unless I'm missing something.
> 
> Good point, I think Will forgot about arm64 (weird ;)).

Oops, I think arm64 didn't implement set_arch_dma_coherent_ops when I
started that series and I forgot to refresh it.

> I'll push this out since Will is on holiday, probably shortly after
> -rc1.
> 
> -----8<--------------------------------------------
> 
> From 40ec7fd94b4efbd5d74185a062433f71c6576e20 Mon Sep 17 00:00:00 2001
> From: Catalin Marinas <catalin.marinas@....com>
> Date: Thu, 18 Dec 2014 17:13:49 +0000
> Subject: [PATCH] arm64: Replace set_arch_dma_coherent_ops with
>  arch_setup_dma_ops
> 
> Commit a3a60f81ee6f (dma-mapping: replace set_arch_dma_coherent_ops with
> arch_setup_dma_ops) changes the of_dma_configure() arch dma_ops callback
> to arch_setup_dma_ops but only the arch/arm code is updated. Subsequent
> commit 97890ba9289c (dma-mapping: detect and configure IOMMU in
> of_dma_configure) changes the arch_setup_dma_ops() prototype further to
> handle iommu. The patch makes the corresponding arm64 changes.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Cc: Will Deacon <will.deacon@....com>
> ---
>  arch/arm64/include/asm/dma-mapping.h | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
> index d34189bceff7..9ce3e680ae1c 100644
> --- a/arch/arm64/include/asm/dma-mapping.h
> +++ b/arch/arm64/include/asm/dma-mapping.h
> @@ -52,13 +52,14 @@ static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
>  	dev->archdata.dma_ops = ops;
>  }
>  
> -static inline int set_arch_dma_coherent_ops(struct device *dev)
> +static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
> +				      struct iommu_ops *iommu, bool coherent)
>  {
> -	dev->archdata.dma_coherent = true;
> -	set_dma_ops(dev, &coherent_swiotlb_dma_ops);
> -	return 0;
> +	dev->archdata.dma_coherent = coherent;
> +	if (coherent)
> +		set_dma_ops(dev, &coherent_swiotlb_dma_ops);
>  }
> -#define set_arch_dma_coherent_ops	set_arch_dma_coherent_ops
> +#define arch_setup_dma_ops	arch_setup_dma_ops

Acked-by: Will Deacon <will.deacon@....com>

Thanks for fixing this.

Will
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