On Tue, Jun 15, 2021 at 4:18 PM Dan Williams <[email protected]> wrote: > > Changes since v1 [1]:
Neglected the v1 link: https://lore.kernel.org/r/162336395765.2462439.11368504490069925374.st...@dwillia2-desk3.amr.corp.intel.com > - cleanup @flush determination in unregister_nvb() (Jonathan) > - cleanup online_nvdimm_bus() to return a status code (Jonathan) > - drop unnecessary header includes (Jonathan) > - drop unused cxl_nvdimm driver data (Jonathan) > - rename the bus to be unregistered as @victim_bus in > cxl_nvb_update_state() (Jonathan) > - miscellaneous cleanups and pick up reviewed-by's (Jonathan) > > --- > > CXL Memory Expander devices (CXL 2.0 Type-3) support persistent memory > in addition to volatile memory expansion. The most significant changes > this requires of the existing LIBNVDIMM infrastructure, compared to what > was needed to support ACPI NFIT defined PMEM, is the ability to > dynamically provision regions in addition to namespaces, and a formal > model for hotplug. > > Before region provisioning can be added the CXL enabling needs to > enumerate "nvdimm" devices on a CXL nvdimm-bus. This is modeled as a > CXL-nvdimm-bridge device (bridging CXL to nvdimm) and an associated > driver to activate and deactivate that bus-bridge. Once the bridge is > registered it scans for CXL nvdimm devices registered by endpoints. The > CXL core bus is used as a rendezvous for nvdimm bridges and endpoints > allowing them to be registered and enabled in any order. > > At the end of this series the ndctl utility can see CXL nvdimm resources > just like any other nvdimm bus. > > # ndctl list -BDiu -b CXL > { > "provider":"CXL", > "dev":"ndbus1", > "dimms":[ > { > "dev":"nmem1", > "state":"disabled" > }, > { > "dev":"nmem0", > "state":"disabled" > } > ] > } > > Follow-on patches extend the nvdimm core label support for CXL region > and namespace labels. For now just add the machinery to register the > bus and nvdimm base objects. > > --- > > Dan Williams (5): > cxl/core: Add cxl-bus driver infrastructure > cxl/pmem: Add initial infrastructure for pmem support > libnvdimm: Export nvdimm shutdown helper, nvdimm_delete() > libnvdimm: Drop unused device power management support > cxl/pmem: Register 'pmem' / cxl_nvdimm devices > > > drivers/cxl/Kconfig | 13 ++ > drivers/cxl/Makefile | 2 > drivers/cxl/acpi.c | 37 ++++++ > drivers/cxl/core.c | 280 > ++++++++++++++++++++++++++++++++++++++++++++ > drivers/cxl/cxl.h | 56 +++++++++ > drivers/cxl/mem.h | 1 > drivers/cxl/pci.c | 23 +++- > drivers/cxl/pmem.c | 230 ++++++++++++++++++++++++++++++++++++ > drivers/nvdimm/bus.c | 64 ++++++---- > drivers/nvdimm/dimm_devs.c | 18 +++ > include/linux/libnvdimm.h | 1 > 11 files changed, 694 insertions(+), 31 deletions(-) > create mode 100644 drivers/cxl/pmem.c > > base-commit: 87815ee9d0060a91bdf18266e42837a9adb5972e
