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SubjectRe: [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@redhat.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@linux.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]

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