From: Clay Mayers <clay.may...@kioxia.com> ZNS controllers have the option to limit the time a zone can remain in the active state. It begins with a background process in the controller setting the finish-zone-recommended FZR attribute for a zone. As part of setting this attribute, the zone's id is added to the namespace's zone-descriptor-changed (ZDC) log page. If enabled, items added to the ZDC log page generate a ZDC "asynchronous event notification" AEN. Optionally, the control can induce a "zone excursion" forcing the zone into the finished state that also generates a ZDC event.
Zone enabled applications need to properly handle ZDC events. In a real device, the timeout is many hours making testing an application difficult. Implemented is the generation of FZR ZDC events to speed up O/S and application testing. Added to the zoned NVMe command set is an optional, per-namespace timer (zoned.finish_time) to set the FZR attr for long-lived active zones; A per namespace ZDC log page; AEN results to including CQE.DW1 (the NSID of the ZDC AEN) and generating a ZDC AEN if it's been enabled. Zone excursions are not modeled. See section 5.5 of the NVMe Zoned Namespace Command Set Specification v1.1 for more details. Clay Mayers (4): hw/block/nvme: add ZONE_FINISH_RECOMMENDED functionality hw/block/nvme: add zone descriptor changed log page hw/block/nvme: supply dw1 for aen result hw/block/nvme: add zone descriptor changed AEN docs/system/devices/nvme.rst | 5 ++ hw/nvme/ctrl.c | 166 +++++++++++++++++++++++++++++++++-- hw/nvme/ns.c | 15 ++++ hw/nvme/nvme.h | 37 +++++++- hw/nvme/trace-events | 3 +- include/block/nvme.h | 14 ++- 6 files changed, 225 insertions(+), 15 deletions(-) -- 2.27.0
