linux-kernel - Re: [RFC][PATCH 1/3] iommu/fsl: Store iommu domain information pointer in archdata.

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Message-Id: <5BDB4D18-CB0D-4EBA-B38F-A278B7C00A61@kernel.crashing.org>
Date:	Wed, 19 Sep 2012 08:50:14 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	"<b16395@...escale.com>" <b16395@...escale.com>
Cc:	<iommu@...ts.linux-foundation.org>, <joerg.roedel@....com>,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	Varun Sethi <Varun.Sethi@...escale.com>
Subject: Re: [RFC][PATCH 1/3] iommu/fsl: Store iommu domain information pointer in archdata.


On Sep 19, 2012, at 8:17 AM, <b16395@...escale.com> <b16395@...escale.com> wrote:

> From: Varun Sethi <Varun.Sethi@...escale.com>
> 
> Add a new field in the device (powerpc) archdata structure for storing iommu domain
> information pointer. This pointer is stored when the device is attached to a particular
> domain.
> 
> Signed-off-by: Varun Sethi <Varun.Sethi@...escale.com>
> ---
> arch/powerpc/include/asm/device.h |    4 ++++
> 1 files changed, 4 insertions(+), 0 deletions(-)

Not too familiar, but what does the IBM Server IOMMU do for iommu_domain?

> 
> diff --git a/arch/powerpc/include/asm/device.h b/arch/powerpc/include/asm/device.h
> index 77e97dd..6dc79fe 100644
> --- a/arch/powerpc/include/asm/device.h
> +++ b/arch/powerpc/include/asm/device.h
> @@ -28,6 +28,10 @@ struct dev_archdata {
> 		void		*iommu_table_base;
> 	} dma_data;
> 
> +	/* IOMMU domain information pointer. This would be set
> +	 * when this device is attached to an iommu_domain.
> +	 */
> +	void			*iommu_domain;
> #ifdef CONFIG_SWIOTLB
> 	dma_addr_t		max_direct_dma_addr;
> #endif
> -- 
> 1.7.4.1
> 
> 
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