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

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Date:   Tue, 30 Apr 2019 07:15:45 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     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>,
        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 4/29/19 6:17 PM, Jacob Pan wrote:
> On Fri, 26 Apr 2019 18:22:46 +0200
> Auger Eric <eric.auger@...hat.com> wrote:
> 
>> 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
>>>
> will fix, thanks
>>> 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?
>>
> I put it in uapi since the related definitions for granularity and
> cache type are in the same file.
> Maybe putting them close together like this? I was thinking you can just
> fold it into your next series as one patch for introducing cache
> invalidation.
> diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
> index 2d8fac8..4ff6929 100644
> --- a/include/uapi/linux/iommu.h
> +++ b/include/uapi/linux/iommu.h
> @@ -164,6 +164,7 @@ enum iommu_inv_granularity {
>         IOMMU_INV_GRANU_DOMAIN, /* domain-selective invalidation */
>         IOMMU_INV_GRANU_PASID,  /* pasid-selective invalidation */
>         IOMMU_INV_GRANU_ADDR,   /* page-selective invalidation */
> +       NR_IOMMU_INVAL_GRANU,   /* number of invalidation granularities
> */ };
>  
>  /**
> @@ -228,6 +229,7 @@ struct iommu_cache_invalidate_info {
>  #define IOMMU_CACHE_INV_TYPE_IOTLB     (1 << 0) /* IOMMU IOTLB */
>  #define IOMMU_CACHE_INV_TYPE_DEV_IOTLB (1 << 1) /* Device IOTLB */
>  #define IOMMU_CACHE_INV_TYPE_PASID     (1 << 2) /* PASID cache */
> +#define NR_IOMMU_CACHE_TYPE            (3)

OK I will add this.

Thanks

Eric
>         __u8    cache;
>         __u8    granularity;
> 
>> Thanks
>>
>> Eric
> 
> [Jacob Pan]
>