linux-kernel - Re: [PATCH 5/6 v8] iommu/fsl: Add addtional attributes specific to the PAMU driver.

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Date:	Wed, 27 Feb 2013 12:38:22 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Varun Sethi <Varun.Sethi@...escale.com>
Cc:	iommu@...ts.linux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, scottwood@...escale.com,
	stuart.yoder@...escale.com
Subject: Re: [PATCH 5/6 v8] iommu/fsl: Add addtional attributes specific to
 the PAMU driver.

On Mon, Feb 18, 2013 at 06:22:18PM +0530, Varun Sethi wrote:
> Added the following domain attributes for the FSL PAMU driver:
> 1. Added new iommu stash attribute, which allows setting of the
>    LIODN specific stash id parameter through IOMMU API.
> 2. Added an attribute for enabling/disabling DMA to a particular
>    memory window.
> 3. Added domain attribute to check for PAMUV1 specific constraints.
> 
> 
> Signed-off-by: Varun Sethi <Varun.Sethi@...escale.com>
> ---
>  include/linux/iommu.h |   33 +++++++++++++++++++++++++++++++++
>  1 files changed, 33 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 529987c..c44e38b 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -40,6 +40,23 @@ struct notifier_block;
>  typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
>  			struct device *, unsigned long, int, void *);
>  
> +/* cache stash targets */
> +#define IOMMU_ATTR_CACHE_L1 1
> +#define IOMMU_ATTR_CACHE_L2 2
> +#define IOMMU_ATTR_CACHE_L3 3
> +
> +/* This attribute corresponds to IOMMUs capable of generating
> + * a stash transaction. A stash transaction is typically a
> + * hardware initiated prefetch of data from memory to cache.
> + * This attribute allows configuring stashig specific parameters
> + * in the IOMMU hardware.
> + */
> +
> +struct iommu_stash_attribute {
> +	u32 	cpu;	/* cpu number */
> +	u32 	cache;	/* cache to stash to: L1,L2,L3 */
> +};

Please make the cache-attribute an enum instead of using defines.


	Joerg


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