linux-kernel - Re: [PATCH v2 1/7] driver core: Add iommu

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Date:	Wed, 20 Jun 2012 15:45:40 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	joerg.roedel@....com, dwmw2@...radead.org,
	iommu@...ts.linux-foundation.org, bhelgaas@...gle.com,
	aik@...abs.ru, david@...son.dropbear.id.au, konrad.wilk@...cle.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	gregkh@...uxfoundation.org, ddutile@...hat.com, liuj97@...il.com
Subject: Re: [PATCH v2 1/7] driver core: Add iommu_group tracking to struct
 device

On Wed, 2012-05-30 at 14:18 -0600, Alex Williamson wrote:
> IOMMU groups allow IOMMU drivers to represent DMA visibility
> and isolation of devices.  Multiple devices may be grouped
> together for the purposes of DMA.  Placing a pointer on
> struct device enable easy access for things like streaming
> DMA programming and drivers like VFIO.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

> ---
> 
>  include/linux/device.h |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 161d962..d0e4d99 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -36,6 +36,7 @@ struct subsys_private;
>  struct bus_type;
>  struct device_node;
>  struct iommu_ops;
> +struct iommu_group;
>  
>  struct bus_attribute {
>  	struct attribute	attr;
> @@ -687,6 +688,7 @@ struct device {
>  	const struct attribute_group **groups;	/* optional groups */
>  
>  	void	(*release)(struct device *dev);
> +	struct iommu_group	*iommu_group;
>  };
>  
>  /* Get the wakeup routines, which depend on struct device */
> 
> --
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