linux-kernel - Re: [PATCH] iommu: moving initialization earlier

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Date:	Thu, 10 Jan 2013 18:09:43 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	Joerg Roedel <joerg.roedel@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] iommu: moving initialization earlier

On Mon, Jan 07, 2013 at 06:51:52PM +1100, Alexey Kardashevskiy wrote:
> The iommu_init() initializes IOMMU internal structures and data
> required for the IOMMU API as iommu_group_alloc().
> It is registered as a subsys_initcall now.
> 
> One of the IOMMU users is going to be a PCI subsystem on POWER.
> It discovers new IOMMU tables during the PCI scan so the logical
> place to call iommu_group_alloc() is the moment when a new group
> is discovered. However PCI scan is done from subsys_initcall hook
> as IOMMU does so PCI hook can be (and is) called before the IOMMU one.
> 
> The patch moves IOMMU subsystem initialization one step earlier
> to make sure that IOMMU is initialized before PCI scan begins.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>

Applied, thanks.


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