linux-kernel - Re: [PATCH 4/5 v11] iommu/fsl: Add additional iommu attributes required by the PAMU driver.

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Date:	Tue, 2 Apr 2013 17:10:12 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Varun Sethi <Varun.Sethi@...escale.com>
Cc:	stuart.yoder@...escale.com, scottwood@...escale.com,
	iommu@...ts.linux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, galak@...nel.crashing.org,
	benh@...nel.crashing.org
Subject: Re: [PATCH 4/5 v11] iommu/fsl: Add additional iommu attributes
 required by the PAMU driver.

On Fri, Mar 29, 2013 at 01:24:01AM +0530, Varun Sethi wrote:
> +/* cache stash targets */
> +enum stash_target {
> +	IOMMU_ATTR_CACHE_L1 = 1,
> +	IOMMU_ATTR_CACHE_L2,
> +	IOMMU_ATTR_CACHE_L3,
> +};
> +
> +/* 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 */
> +};
> +

I would prefer these PAMU specific enum and struct to be in a
pamu-specific iommu-header.


	Joerg


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