linux-kernel - Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

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Message-Id: <BAB98EA5-5324-4FB2-97C2-A28A96C569DC@kernel.crashing.org>
Date:	Thu, 28 Feb 2013 09:51:23 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Sethi Varun-B16395 <B16395@...escale.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	iommu@...ts.linux-foundation.org,
	"linuxppc-dev@...ts.ozlabs.org list" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org list" <linux-kernel@...r.kernel.org>,
	Wood Scott-B07421 <B07421@...escale.com>,
	Yoder Stuart-B08248 <B08248@...escale.com>,
	Joerg Roedel <joro@...tes.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alexey Kardashevskiy <aik@...abs.ru>
Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.


On Feb 27, 2013, at 6:04 AM, Sethi Varun-B16395 wrote:

> Hi Kumar,Ben,
> I am implementing the Freescale PAMU (IOMMU) driver using the Linux IOMMU API. In this particular patch, I have added a new field to dev_archdata structure to store the dma domain information.
> This field is updated whenever we attach a device to an iommu domain.
> 
> Regards
> Varun

Would be good to see if this overlaps with Alexey's work for IOMMU driver for powernv.

- k

> 
>> -----Original Message-----
>> From: Joerg Roedel [mailto:joro@...tes.org]
>> Sent: Wednesday, February 27, 2013 5:01 PM
>> To: Sethi Varun-B16395
>> Cc: iommu@...ts.linux-foundation.org; linuxppc-dev@...ts.ozlabs.org;
>> linux-kernel@...r.kernel.org; Wood Scott-B07421; Yoder Stuart-B08248
>> Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information
>> pointer in archdata.
>> 
>> On Mon, Feb 18, 2013 at 06:22:14PM +0530, Varun Sethi wrote:
>>> 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>
>>> ---
>>> - no change.
>>> arch/powerpc/include/asm/device.h |    4 ++++
>>> 1 files changed, 4 insertions(+), 0 deletions(-)
>>> 
>>> 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;
>> 
>> Please Cc the PowerPC Maintainers on this, so that they can have a look
>> at it. This also must be put this into an #ifdef CONFIG_IOMMU_API.
>> 
>> 
>> 	Joerg
>> 
>> 
> 
> 
> --
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