These are the first eight patches of the Dynamic Capacity Device (DCD) series. They set up: DCD enumeration, CDAT handling for DC partitions, the event interrupt plumbing, a preparatory refactor, and documentation of the DPA partition layout. They stand alone and keep DCD disabled. They are not dependent on the rest of the series. Patch 1 detects the 48h command set and then leaves mds->dcd_supported false. The flag is only turned on by the series that adds DCD event handling, so every DCD specific path added here is shut off at runtime: cxl_configure_dcd() never runs, no DC partition is created, no DCD interrupt is armed, and the CXL_PARTMODE_DYNAMIC_RAM paths are unreachable. The intent is to land the enumeration and plumbing while the extent to DAX pipeline is still under review.
Based on v7.3-rc6 v15: https://lore.kernel.org/linux-cxl/[email protected]/ v15 -> v16 Changes: =================== A quick respin: - Patch 2: cxl_configure_dcd() took Identify Total Capacity as the end of static capacity, but Total Capacity is only required to be >= ram + pmem. The static end now comes from the last static partition's end dpa +1 instead of info->size. Check that DC starts from there. (Richard). - Patch 3: dsmas_entry.qos_class initialized as CXL_QOS_CLASS_INVALID, so a DSMAS entry that is skipped for lack of DSLBIS, or whose QTG lookup fails, no longer reaches update_perf_entry() with qos_class 0, which is a valid class. (Sashiko). The DSMAD handle check now checks handle > U8_MAX instead of handle & ~0xFF (Dave). - Patch 6: when the DCD vector cannot be requested, tell the device not to use the vector: dcd_settings is cleared with Set Event Interrupt Policy, so a device does not keep signalling a vector with no handler while the host considers DCD off. The Set command is re-factored into a new helper cxl_event_set_int_policy() (Richard). All other patches are unchanged. I kept the review tags on patch 3, since the changes are minimal and dropped tags from 2 and 6. Patch organization ================== 1-3: enumerate DCD command support, read the DC configuration, and pick up DSMAS data for DC partitions. 4-6: split event msgnum configuration from irq setup, factor out the interrupt policy check, then configure the DCD event interrupt. 7: preparatory refactor -- enforce partition order while collapsing the ram/pmem specific partition helpers into one. 8: document the DPA partition layout the previous patches enforce, and where Linux is stricter than the specification. Testing ======= This series leaves mds->dcd_supported false on purpose, so cxl_configure_dcd(), cxl_dev_dc_identify() and cxl_dc_check() are unreachable at runtime as posted. The tests below are done with the rest of the series on top, otherwise testing would not yield any meaningful results. HW: Tested add and release of one 2G tagged extent on a DCD with a sharable partition, driven from the system's BMC with FM-API Initiate Dynamic Capacity Add / Release over MCTP, to confirm the DCD interrupt configuration and the DSMAS attributes are read properly. The device is sharable, so an add without a tag and sequence number is refused. cxl_test: ndctl cxl test suite 16 of 17 pass, cxl-features.sh skips for lack of FWCTL Anisa Su (1): Documentation/cxl: Document DPA partition layout and ordering rules Ira Weiny (7): cxl/mbox: Flag support for Dynamic Capacity Devices (DCD) cxl/mem: Read dynamic capacity configuration from the device cxl/cdat: Gather DSMAS data for DCD partitions cxl/events: Split event msgnum configuration from irq setup cxl/pci: Factor out interrupt policy check cxl/mem: Configure dynamic capacity interrupts cxl/core: Enforce partition order/simplify partition calls .../driver-api/cxl/linux/cxl-driver.rst | 35 +++ Documentation/driver-api/cxl/maturity-map.rst | 4 + drivers/cxl/core/cdat.c | 99 +++++- drivers/cxl/core/hdm.c | 24 +- drivers/cxl/core/mbox.c | 285 ++++++++++++++++++ drivers/cxl/core/memdev.c | 100 ++++-- drivers/cxl/cxl.h | 14 +- drivers/cxl/cxlmem.h | 88 +++++- drivers/cxl/mem.c | 2 +- drivers/cxl/pci.c | 207 ++++++++++--- include/cxl/cxl.h | 29 +- tools/testing/cxl/test/mem.c | 2 +- 12 files changed, 792 insertions(+), 97 deletions(-) base-commit: a90ee4305c4a5df72c11b31dacfdc76e00fcf78a -- 2.43.0
