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From: Thierry Reding <thierry.reding@gmail.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org,
	Will Deacon <will.deacon@arm.com>, Kukjin Kim <kgene@kernel.org>,
	David Woodhouse <dwmw2@infradead.org>,
	Heiko Stuebner <heiko@sntech.de>, Hiroshi Doyu <hdoyu@nvidia.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Arnd Bergmann <arnd@arndb.de>,
	linux-kernel@vger.kernel.org, Robin Murphy <robin.murphy@arm.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	jroedel@suse.de
Subject: Re: [PATCH 3/5] iommu: Limit iommu_attach/detach_device to devices with their own group
Date: Tue, 3 Feb 2015 13:25:07 +0100	[thread overview]
Message-ID: <20150203122506.GC15068@ulmo.nvidia.com> (raw)
In-Reply-To: <1422317339-22620-4-git-send-email-joro@8bytes.org>

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On Tue, Jan 27, 2015 at 01:08:57AM +0100, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@suse.de>
> 
> This patch changes the behavior of the iommu_attach_device
> and iommu_detach_device functions. With this change these
> functions only work on devices that have their own group.
> For all other devices the iommu_group_attach/detach
> functions must be used.
> 
> Signed-off-by: Joerg Roedel <jroedel@suse.de>
> ---
>  drivers/iommu/iommu.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 59 insertions(+), 4 deletions(-)

Sorry for my ignorance, but I don't understand what IOMMU groups are
supposed to be or how to make use of them. It seems like a common idiom
is to simply allocate a new group and add a device to it in the IOMMU's
->add_device() callback, but I fail to see the reason for that.

Can anybody point me to documentation about this? I've looked and I did
not find anything.

Thierry

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  parent reply	other threads:[~2015-02-03 12:25 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-27  0:08 [RFC PATCH 0/5] iommu: Introduce default domains for iommu groups Joerg Roedel
2015-01-27  0:08 ` [PATCH 1/5] iommu: Add default domain to iommu-groups Joerg Roedel
2015-01-27  0:08 ` [PATCH 2/5] iommu: Allocate a default domain for iommu groups Joerg Roedel
2015-01-28 14:30   ` Will Deacon
2015-01-28 15:11     ` Robin Murphy
2015-01-30 12:25     ` Joerg Roedel
2015-01-27  0:08 ` [PATCH 3/5] iommu: Limit iommu_attach/detach_device to devices with their own group Joerg Roedel
2015-01-28 14:35   ` Will Deacon
2015-01-30 12:28     ` Joerg Roedel
2015-02-02 16:45       ` Will Deacon
2015-02-03 12:25   ` Thierry Reding [this message]
2015-02-03 12:59     ` Joerg Roedel
2015-01-27  0:08 ` [PATCH 4/5] iommu: Make sure a device is always attached to a domain Joerg Roedel
2015-01-28 14:38   ` Will Deacon
2015-01-30 12:29     ` Joerg Roedel
2015-01-27  0:08 ` [PATCH 5/5] iommu: Add iommu_get_domain_for_dev function Joerg Roedel

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