linux-kernel - Re: [PATCH v2 17/19] iommu: Add max num of cache and granu types

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Date:   Fri, 26 Apr 2019 18:22:46 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>
Cc:     Yi Liu <yi.l.liu@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Andriy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v2 17/19] iommu: Add max num of cache and granu types

Hi Jacob,

On 4/24/19 1:31 AM, Jacob Pan wrote:
> To convert to/from cache types and granularities between generic and
> VT-d specific counterparts, a 2D arrary is used. Introduce the limits
array
> to help define the converstion array size.
conversion
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  include/uapi/linux/iommu.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
> index 5c95905..2d8fac8 100644
> --- a/include/uapi/linux/iommu.h
> +++ b/include/uapi/linux/iommu.h
> @@ -197,6 +197,7 @@ struct iommu_inv_addr_info {
>  	__u64	granule_size;
>  	__u64	nb_granules;
>  };
> +#define NR_IOMMU_CACHE_INVAL_GRANU	(3)
>  
>  /**
>   * First level/stage invalidation information
> @@ -235,6 +236,7 @@ struct iommu_cache_invalidate_info {
>  		struct iommu_inv_addr_info addr_info;
>  	};
>  };
> +#define NR_IOMMU_CACHE_TYPE		(3)
>  /**
>   * struct gpasid_bind_data - Information about device and guest PASID binding
>   * @gcr3:	Guest CR3 value from guest mm
> 
Is it really something that needs to be exposed in the uapi?

Thanks

Eric