With the introduction of the new objects, update the doc to reflect that. Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx> --- Documentation/userspace-api/iommufd.rst | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/Documentation/userspace-api/iommufd.rst b/Documentation/userspace-api/iommufd.rst index 70289d6815d2..798520d9344d 100644 --- a/Documentation/userspace-api/iommufd.rst +++ b/Documentation/userspace-api/iommufd.rst @@ -63,6 +63,14 @@ Following IOMMUFD objects are exposed to userspace: space usually has mappings from guest-level I/O virtual addresses to guest- level physical addresses. +- IOMMUFD_OBJ_EVENTQ_IOPF, representing a software queue for an HWPT_NESTED + reporting IO Page Fault using the IOMMU HW's PRI (Page Request Interface). + This queue object provides user space an FD to poll the page fault events + and also to respond to those events. An EVENTQ_IOPF object must be created + first to get a fault_id that could be then used to allocate an HWPT_NESTED + via the IOMMU_HWPT_ALLOC command setting IOMMU_HWPT_FAULT_ID_VALID set in + its flags field. + - IOMMUFD_OBJ_VIOMMU, representing a slice of the physical IOMMU instance, passed to or shared with a VM. It may be some HW-accelerated virtualization features and some SW resources used by the VM. For examples: @@ -109,6 +117,15 @@ Following IOMMUFD objects are exposed to userspace: vIOMMU, which is a separate ioctl call from attaching the same device to an HWPT_PAGING that the vIOMMU holds. +- IOMMUFD_OBJ_EVENTQ_VIRQ, representing a software queue for IOMMUFD_OBJ_VIOMMU + reporting its non-affiliated events, such as translation faults occurred to a + nested stage-1 and HW-specific events/irqs e.g. events to invalidation queues + that are assigned to VMs via vIOMMUs. This queue object provides user space an + FD to poll the vIOMMU events. A vIOMMU object must be created first to get its + viommu_id that could be then used to allocate an EVENTQ_VIRQ. Each vIOMMU can + support multiple types of EVENTQ_VIRQs, but is confined to one EVENTQ_VIRQ per + vIRQ type. + All user-visible objects are destroyed via the IOMMU_DESTROY uAPI. The diagrams below show relationships between user-visible objects and kernel @@ -251,8 +268,10 @@ User visible objects are backed by following datastructures: - iommufd_device for IOMMUFD_OBJ_DEVICE. - iommufd_hwpt_paging for IOMMUFD_OBJ_HWPT_PAGING. - iommufd_hwpt_nested for IOMMUFD_OBJ_HWPT_NESTED. +- iommufd_eventq_iopf for IOMMUFD_OBJ_EVENTQ_IOPF. - iommufd_viommu for IOMMUFD_OBJ_VIOMMU. - iommufd_vdevice for IOMMUFD_OBJ_VDEVICE. +- iommufd_eventq_virq for IOMMUFD_OBJ_EVENTQ_VIRQ. Several terminologies when looking at these datastructures: -- 2.43.0
