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.suthikulpa...@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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