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.stgit@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