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Message-ID: <20150128143523.GR1569@arm.com>
Date: Wed, 28 Jan 2015 14:35:24 +0000
From: Will Deacon <will.deacon@....com>
To: Joerg Roedel <joro@...tes.org>
Cc: "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
Kukjin Kim <kgene@...nel.org>,
David Woodhouse <dwmw2@...radead.org>,
Heiko Stuebner <heiko@...ech.de>,
Hiroshi Doyu <hdoyu@...dia.com>,
Thierry Reding <thierry.reding@...il.com>,
Alex Williamson <alex.williamson@...hat.com>,
Arnd Bergmann <arnd@...db.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Robin Murphy <Robin.Murphy@....com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
"jroedel@...e.de" <jroedel@...e.de>
Subject: Re: [PATCH 3/5] iommu: Limit iommu_attach/detach_device to devices
with their own group
On Tue, Jan 27, 2015 at 12:08:57AM +0000, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.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.
I like this a lot. Currently, if somebody detaches a device from the ARM
SMMU, I end up detaching its group as well, which I've always found slightly
odd.
> Signed-off-by: Joerg Roedel <jroedel@...e.de>
> ---
> drivers/iommu/iommu.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 59 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 8f33ddd3..b63a550 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -51,6 +51,7 @@ struct iommu_group {
> void (*iommu_data_release)(void *iommu_data);
> char *name;
> int id;
> + unsigned dev_cnt;
Is this actually used on a fast path, or can we just inspect the list of
devices on the group instead?
Will
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