linux-kernel - Re: [PATCH 2/5] iommu/amd: Implement DOMAIN_ATTR

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Date:	Thu, 19 Jan 2012 16:46:13 +0100
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	"Ohad Ben-Cohen" <ohad@...ery.com>,
	David Woodhouse <dwmw2@...radead.org>,
	David Brown <davidb@...eaurora.org>,
	Tony Lindgren <tony@...mide.com>,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	Stuart Yoder <b08248@...il.com>,
	Scott Wood <scottwood@...escale.com>,
	Hiroshi Doyu <hdoyu@...dia.com>
Subject: Re: [PATCH 2/5] iommu/amd: Implement DOMAIN_ATTR_GEOMETRY attribute

Hi Joerg,

On Thursday 19 January 2012 15:30:02 Joerg Roedel wrote:
> Implement the attribute itself and add the code for the
> AMD IOMMU driver.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  drivers/iommu/amd_iommu.c |    4 ++++
>  drivers/iommu/iommu.c     |   19 ++++++++++++++++---
>  include/linux/iommu.h     |   11 ++++++++++-
>  3 files changed, 30 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index cce1f03..421c3e6 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -3030,6 +3030,10 @@ static int amd_iommu_domain_init(struct iommu_domain
> *dom)
> 
>  	dom->priv = domain;
> 
> +	dom->geometry.aperture_start = 0;
> +	dom->geometry.aperture_end   = ~0ULL;
> +	dom->geometry.force_aperture = true;
> +
>  	return 0;
> 
>  out_free:
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index ef54718..3d0b0bf 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -345,10 +345,23 @@ EXPORT_SYMBOL_GPL(iommu_device_group);
>  int iommu_domain_get_attr(struct iommu_domain *domain,
>  			  enum iommu_attr attr, void *data)
>  {
> -	if (!domain->ops->domain_get_attr)
> -		return -EINVAL;
> +	struct iommu_domain_geometry *geometry;
> +	int ret = 0;
> +
> +	switch (attr) {
> +	case DOMAIN_ATTR_GEOMETRY:
> +		geometry  = data;
> +		*geometry = domain->geometry;
> +
> +		break;
> +	default:
> +		if (!domain->ops->domain_get_attr)
> +			return -EINVAL;
> 
> -	return domain->ops->domain_get_attr(domain, attr, data);
> +		ret = domain->ops->domain_get_attr(domain, attr, data);
> +	}
> +
> +	return ret;
>  }
>  EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
> 
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 32d0de1..3f971b3 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -37,16 +37,24 @@ struct iommu_domain;
>  typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
>  				struct device *, unsigned long, int);
> 
> +struct iommu_domain_geometry {
> +	u64 aperture_start;	/* First address that can be mapped    */
> +	u64 aperture_end;	/* Last address that can be mapped     */

Would it make sense to use a platform-dependent type that represents physical 
addresses instead of u64 ?

> +	bool force_aperture;	/* DMA only allowed in mappable range? */
> +};
> +
>  struct iommu_domain {
>  	struct iommu_ops *ops;
>  	void *priv;
>  	iommu_fault_handler_t handler;
> +	struct iommu_domain_geometry geometry;
>  };
> 
>  #define IOMMU_CAP_CACHE_COHERENCY	0x1
>  #define IOMMU_CAP_INTR_REMAP		0x2	/* isolates device intrs */
> 
>  enum iommu_attr {
> +	DOMAIN_ATTR_GEOMETRY,	/* struct iommu_domain_geometry */
>  	DOMAIN_ATTR_MAX,
>  };
> 
> @@ -62,7 +70,8 @@ enum iommu_attr {
>   * @unmap: unmap a physically contiguous memory region from an iommu
> domain * @iova_to_phys: translate iova to physical address
>   * @domain_has_cap: domain capabilities query
> - * @commit: commit iommu domain
> + * @domain_get_attr: Query domain attributes
> + * @domain_set_attr: Change domain attributes

This belongs to the previous patch.

>   * @pgsize_bitmap: bitmap of supported page sizes
>   */
>  struct iommu_ops {

-- 
Regards,

Laurent Pinchart
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