linux-kernel - Re: [PATCH] iommu: add a function to find an iommu group by id

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Date:	Wed, 24 Apr 2013 20:01:49 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	Alex Williamson <alex.williamson@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH] iommu: add a function to find an iommu group by id

On Mon, Mar 25, 2013 at 10:23:49AM +1100, Alexey Kardashevskiy wrote:
> As IOMMU groups are exposed to the user space by their numbers,
> the user space can use them in various kernel APIs so the kernel
> might need an API to find a group by its ID.
> 
> As an example, QEMU VFIO on PPC64 platform needs it to associate
> a logical bus number (LIOBN) with a specific IOMMU group in order
> to support in-kernel handling of DMA map/unmap requests.
> 
> The patch adds the iommu_group_get_by_id(id) function which performs
> such search.
> 
> v2: fixed reference counting.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>

Applied to core branch, thanks Alexey.


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