Messages in this thread | | | Date | Mon, 28 Dec 2015 16:43:00 +0100 | From | Joerg Roedel <> | Subject | Re: [PATCH 3/6] iommu/amd: Introduce amd_iommu_get_num_iommus() |
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On Tue, Dec 22, 2015 at 01:19:14PM -0600, Suthikulpanit, Suravee wrote: > This patch introduces amd_iommu_get_num_iommus(). Initially, this is > intended to be used by Perf AMD IOMMU driver. > > Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> > --- > drivers/iommu/amd_iommu_init.c | 16 ++++++++++++++++ > include/linux/perf/perf_event_amd_iommu.h | 2 ++ > 2 files changed, 18 insertions(+) > > diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c > index 275c0f5..9c62613 100644 > --- a/drivers/iommu/amd_iommu_init.c > +++ b/drivers/iommu/amd_iommu_init.c > @@ -2244,6 +2244,22 @@ bool amd_iommu_v2_supported(void) > } > EXPORT_SYMBOL(amd_iommu_v2_supported); > > +static int amd_iommu_cnt; > + > +int amd_iommu_get_num_iommus(void) > +{ > + struct amd_iommu *iommu; > + > + if (amd_iommu_cnt) > + return amd_iommu_cnt; > + > + for_each_iommu(iommu) > + amd_iommu_cnt++;
It is better to set amd_iommu_cnt during IOMMU initialization. You can just increment this value after an IOMMU has been set up.
Joerg
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