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

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Date:   Mon, 29 Apr 2019 09:17:23 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Auger Eric <eric.auger@...hat.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>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v2 17/19] iommu: Add max num of cache and granu types

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)
        __u8    cache;
        __u8    granularity;

> Thanks
> 
> Eric

[Jacob Pan]