Re: [PATCH v2 08/19] iommufd/viommu: Add cache_invalidate for IOMMU_VIOMMU_TYPE_DEFAULT
From: Jason Gunthorpe <jgg@nvidia.com>
Date: 2024-09-05 16:05:08
Also in:
linux-iommu, linux-kselftest, lkml
On Tue, Aug 27, 2024 at 09:59:45AM -0700, Nicolin Chen wrote:
Add a default_viommu_ops with a new op for cache invaldiation, similar to the cache_invalidate_user op in structure iommu_domain_ops, but wider. An IOMMU driver that allocated a nested domain with a core-managed viommu is able to use the same viommu pointer for this cache invalidation API. ARM SMMUv3 for example supports IOTLB and ATC device cache invaldiations. The IOTLB invalidation is per-VMID, held currently by a parent S2 domain. The ATC invalidation is per device (Stream ID) that should be tranlsated by a virtual device ID lookup table. Either case fits the viommu context. Signed-off-by: Nicolin Chen <redacted> --- drivers/iommu/iommufd/iommufd_private.h | 3 +++ drivers/iommu/iommufd/viommu.c | 3 +++ include/linux/iommu.h | 5 +++++ include/linux/iommufd.h | 19 +++++++++++++++++++ 4 files changed, 30 insertions(+)
It looks OK Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Jason