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

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Date:	Thu, 13 Dec 2012 08:48:55 -0700
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org,
	iommu <iommu@...ts.linux-foundation.org>, joro@...tes.org
Subject: Re: [PATCH] iommu: moving initialization earlier

Probably a good idea to CC the iommu list and maintainer...

On Thu, 2012-12-13 at 17:28 +1100, Alexey Kardashevskiy wrote:
> The iommu_init() call initializes IOMMU internal structures and data
> required for the API to function such as iommu_group_alloc().
> It is registered as a subsys_initcall.
> 
> One of the IOMMU users is a PCI subsystem on POWER which discovers new
> IOMMU tables during the PCI scan so the most logical place to call
> iommu_group_alloc() is when a new group is just discovered. However
> PCI scan is done from subsys_initcall hook as well what makes
> using of the IOMMU API impossible.
> 
> The patch moves IOMMU subsystem initialization one step earlier.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> ---
>  drivers/iommu/iommu.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index de857bb..b0afd3d 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -865,7 +865,7 @@ printk("%s %u\n", __func__, __LINE__);
>  
>  	return 0;
>  }
> -subsys_initcall(iommu_init);
> +arch_initcall(iommu_init);
>  
>  int iommu_domain_get_attr(struct iommu_domain *domain,
>  			  enum iommu_attr attr, void *data)



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