> From: Nicolin Chen <nicolinc@xxxxxxxxxx> > Sent: Wednesday, December 4, 2024 6:10 AM > > 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 now it can be used on paging hwpt too > + 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 non-affiliated is only mentioned here. It's not a standard term in this area. Sticking to the later examples in 'such as' is straightforward. > + 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 vcmdq is not supported yet. add it later. > 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
