# Re: \[RFC\]\[PATCH 1/3\] iommu/fsl: Store iommu domain information pointer in archdata.

- From: Kumar Gala \<hidden\>
- Date: 2012-09-19 14:23:39 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2012/09/3925678
- Thread: https://ratatoskr.run/linuxppc-dev/2012/09/3925643/t.md

```text

On Sep 19, 2012, at 8:17 AM, [ref] =
[ref] wrote:

> From: Varun Sethi <redacted>
>=20
> 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.
>=20
> Signed-off-by: Varun Sethi <redacted>
> ---
> 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?

>=20
> 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;
>=20
> +	/* 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
> --=20
> 1.7.4.1
>=20
>=20
> --
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```