Re: [PATCH] x86/events/amd/iommu: Fix cpumask of IOMMU events

Jörg Rödel <[email protected]> Mon, 27 Jul 2026 13:19:42 +0200

Newsgroups	dev.linux.lists.iommu,org.kernel.vger.linux-kernel,org.kernel.vger.linux-perf-users
Message-ID	<[email protected]>

On Sun, May 17, 2026 at 11:40:26AM +0000, Vasant Hegde wrote:
> IOMMU performance counters are accessed via MMIO space. Currently IOMMU
> PMUs uses a single global cpumask (iommu_cpumask) shared across all AMD
> IOMMU PMU instances. This prevents collecting per-socket numbers
> (ex: perf stat --per-socket).
> 
> Fix this by adjusting cpumask based on IOMMUs NUMA node.
> 
> Signed-off-by: Vasant Hegde <[email protected]>
> ---
>  arch/x86/events/amd/iommu.c | 29 +++++++++++++++++++++++------
>  drivers/iommu/amd/init.c    |  7 +++++++
>  include/linux/amd-iommu.h   |  1 +
>  3 files changed, 31 insertions(+), 6 deletions(-)

Acked-by: Joerg Roedel <[email protected]>