linux-kernel - Re: [RFC 1/5] ARM: dev_archdata: add private iommu extension

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Date:	Mon, 26 Sep 2011 19:30:01 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Ohad Ben-Cohen <ohad@...ery.com>
Cc:	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Joerg Roedel <Joerg.Roedel@....com>,
	iommu@...ts.linux-foundation.org, Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org, Cousson Benoit <b-cousson@...com>,
	Kevin Hilman <khilman@...com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [RFC 1/5] ARM: dev_archdata: add private iommu extension

On Sun, Sep 25, 2011 at 01:58:53PM +0300, Ohad Ben-Cohen wrote:
> Add a private iommu pointer to the ARM-specific arch data in the
> device struct, which will be used to attach iommu-specific data
> to devices which require iommu support.
> 
> Different iommu implementations (on different platforms) will attach
> different types of data to this pointer, so 'void *' is currently used
> (the downside is reduced typesafety).
> 
> Note: ia64, x86 and sparc have this exact iommu extension as well, and
> if others are likely to adopt it too, we might want to consider
> adding this to the device struct itself directly.
> 
> Signed-off-by: Ohad Ben-Cohen <ohad@...ery.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> ---
>  arch/arm/include/asm/device.h |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/include/asm/device.h b/arch/arm/include/asm/device.h
> index 9f390ce..6615f03 100644
> --- a/arch/arm/include/asm/device.h
> +++ b/arch/arm/include/asm/device.h
> @@ -10,6 +10,9 @@ struct dev_archdata {
>  #ifdef CONFIG_DMABOUNCE
>  	struct dmabounce_device_info *dmabounce;
>  #endif
> +#ifdef CONFIG_IOMMU_API
> +	void *iommu; /* private IOMMU data */
> +#endif

Blech.  Oh well.  Not much point in doing something different if x86
uses a void*.

g.

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