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To date Linux has been dependent on platform-firmware to map CXL RAM regions and handle events / errors from devices. With this update Linux can now parse / update the CXL memory layout, and report events / errors from devices. This is a precursor for the CXL subsystem to handle the end-to-end "RAS" flow for CXL memory. I.e. the flow that for DDR-attached-DRAM is handled by the EDAC driver where it maps system physical address events to a field-replaceable-unit (FRU / endpoint device). In general, CXL has the potential to standardize what has historically been a pile of memory-controller-specific error handling logic. Another change of note is the default policy for handling RAM-backed device-dax instances. Previously the default access mode was "device", mmap(2) a device special file to access memory. The new default is "kmem" where the address range is assigned to the core-mm via add_memory_driver_managed(). This saves typical users from wondering why their platform memory is not visible via free(1) and stuck behind a device-file. At the same time it allows expert users to deploy policy to, for example, get dedicated access to high performance memory, or hide low performance memory from general purpose kernel allocations. This affects not only CXL, but also systems with high-bandwidth-memory that platform-firmware tags with the EFI_MEMORY_SP (special purpose) designation. All of these topics have had exposure in linux-next. Where you see multiple merges of the same topic branch it is for follow-on fixes and updates discovered after the branch was cut for -next. Each merge has a commit log. A few tags came in after the branch was cut as well: f57aec443c24 cxl/pmem: Fix nvdimm registration races Tested-by: Dave Jiang Reviewed-by: Dave Jiang e686c32590f4 dax/kmem: Fix leak of memory-hotplug resources Reviewed-by: Alistair Popple After the fixups from Arnd, there have not been any other problem reports from -next exposure. --- The following changes since commit 711442e29f16f0d39dd0e2460c9baacfccb9d5a7: cxl/region: Fix passthrough-decoder detection (2023-02-07 11:04:30 -0800) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl tags/cxl-for-6.3 for you to fetch changes up to e686c32590f40bffc45f105c04c836ffad3e531a: dax/kmem: Fix leak of memory-hotplug resources (2023-02-17 14:58:01 -0800) ---------------------------------------------------------------- cxl for v6.3 - CXL RAM region enumeration: instantiate 'struct cxl_region' objects for platform firmware created memory regions - CXL RAM region provisioning: complement the existing PMEM region creation support with RAM region support - "Soft Reservation" policy change: Online (memory hot-add) soft-reserved memory (EFI_MEMORY_SP) by default, but still allow for setting aside such memory for dedicated access via device-dax. - CXL Events and Interrupts: Takeover CXL event handling from platform-firmware (ACPI calls this CXL Memory Error Reporting) and export CXL Events via Linux Trace Events. - Convey CXL _OSC results to drivers: Similar to PCI, let the CXL subsystem interrogate the result of CXL _OSC negotiation. - Emulate CXL DVSEC Range Registers as "decoders": Allow for first-generation devices that pre-date the definition of the CXL HDM Decoder Capability to translate the CXL DVSEC Range Registers into 'struct cxl_decoder' objects. - Set timestamp: Per spec, set the device timestamp in case of hotplug, or if platform-firwmare failed to set it. - General fixups: linux-next build issues, non-urgent fixes for pre-production hardware, unit test fixes, spelling and debug message improvements. ---------------------------------------------------------------- Alison Schofield (2): tools/testing/cxl: Remove cxl_test module math loading message cxl/mem: Add kdoc param for event log driver state Arnd Bergmann (3): cxl: avoid returning uninitialized error code dax: cxl: add CXL_REGION dependency dax/hmem: build hmem device support as module if possible Dan Williams (35): cxl/pci: Move tracepoint definitions to drivers/cxl/core/ tools/testing/cxl: Prevent cxl_test from confusing production modules cxl/region: Clarify when a cxld->commit() callback is mandatory cxl/port: Link the 'parent_dport' in portX/ and endpointX/ sysfs cxl/pci: Fix irq oneshot expectations Merge branch 'for-6.3/cxl' into cxl/next Merge branch 'for-6.3/cxl-events' into cxl/next cxl/memdev: Fix endpoint port removal cxl/Documentation: Update references to attributes added in v6.0 cxl/region: Add a mode attribute for regions cxl/region: Support empty uuids for non-pmem regions cxl/region: Validate region mode vs decoder mode cxl/region: Add volatile region creation support cxl/region: Refactor attach_target() for autodiscovery cxl/region: Cleanup target list on attach error cxl/region: Move region-position validation to a helper kernel/range: Uplevel the cxl subsystem's range_contains() helper cxl/region: Enable CONFIG_CXL_REGION to be toggled cxl/port: Split endpoint and switch port probe cxl/region: Add region autodiscovery tools/testing/cxl: Define a fixed volatile configuration to parse dax/hmem: Move HMAT and Soft reservation probe initcall level dax/hmem: Drop unnecessary dax_hmem_remove() dax/hmem: Convey the dax range via memregion_info() dax/hmem: Move hmem device registration to dax_hmem.ko dax: Assign RAM regions to memory-hotplug by default cxl/dax: Create dax devices for CXL RAM regions Merge branch 'for-6.3/cxl' into cxl/next Merge branch 'for-6.3/cxl-ram-region' into cxl/next cxl/pmem: Fix nvdimm registration races Merge branch 'for-6.3/cxl-ram-region' into cxl/next Merge branch 'for-6.3/cxl' into cxl/next Merge branch 'for-6.3/cxl-rr-emu' into cxl/next Merge branch 'for-6.3/cxl-events' into cxl/next dax/kmem: Fix leak of memory-hotplug resources Dave Jiang (9): cxl: remove unnecessary calling of pci_enable_pcie_error_reporting() cxl: add RAS status unmasking for CXL cxl/pci: Break out range register decoding from cxl_hdm_decode_init() cxl/port: Export cxl_dvsec_rr_decode() to cxl_port cxl/pci: Refactor cxl_hdm_decode_init() cxl/hdm: Emulate HDM decoder from DVSEC range registers cxl/hdm: Create emulated cxl_hdm for devices that do not have HDM decoders cxl/hdm: Add emulation when HDM decoders are not committed cxl/pci: Remove locked check for dvsec_range_allowed() Davidlohr Bueso (3): cxl/region: Only warn about cpu_cache_invalidate_memregion() once cxl/mem: Wire up event interrupts cxl/mem: Correct full ID range allocation Ira Weiny (15): PCI/CXL: Export native CXL error reporting control cxl/mem: Read, trace, and clear events on driver load cxl/mem: Trace General Media Event Record cxl/mem: Trace DRAM Event Record cxl/mem: Trace Memory Module Event Record cxl/test: Add generic mock events cxl/test: Add specific events cxl/test: Simulate event log overflow cxl/mem: Remove unused CXL_CMD_FLAG_NONE define cxl/uapi: Add warning on CXL command enum cxl/uapi: Tag commands from cxl_query_cmd() cxl/mem: Fix UAPI command comment cxl/trace: Standardize device information output cxl/trace: Add host output to trace points cxl/trace: Add serial number to trace points Jonathan Cameron (2): cxl/mbox: Add missing parameter to docs. cxl/pci: Set the device timestamp Luis Chamberlain (1): tools/testing/cxl: require 64-bit Randy Dunlap (1): cxl: fix spelling mistakes Robert Richter (3): cxl/pci: Show opcode in debug messages when sending a command cxl/mbox: Add debug messages for enabled mailbox commands cxl/mbox: Fix Payload Length check for Get Log command Documentation/ABI/testing/sysfs-bus-cxl | 79 ++- MAINTAINERS | 1 + drivers/Makefile | 2 +- drivers/acpi/numa/hmat.c | 4 +- drivers/acpi/pci_root.c | 3 + drivers/cxl/Kconfig | 14 +- drivers/cxl/acpi.c | 5 +- drivers/cxl/core/Makefile | 3 + drivers/cxl/core/core.h | 7 +- drivers/cxl/core/hdm.c | 144 +++++- drivers/cxl/core/mbox.c | 263 +++++++++- drivers/cxl/core/memdev.c | 3 +- drivers/cxl/core/pci.c | 316 ++++++++---- drivers/cxl/core/port.c | 123 +++-- drivers/cxl/core/region.c | 878 +++++++++++++++++++++++++++++--- drivers/cxl/core/trace.c | 5 + drivers/cxl/core/trace.h | 606 ++++++++++++++++++++++ drivers/cxl/cxl.h | 96 +++- drivers/cxl/cxlmem.h | 186 ++++++- drivers/cxl/cxlpci.h | 12 +- drivers/cxl/pci.c | 425 +++++++++++----- drivers/cxl/pmem.c | 1 + drivers/cxl/port.c | 119 +++-- drivers/dax/Kconfig | 17 +- drivers/dax/Makefile | 2 + drivers/dax/bus.c | 55 +- drivers/dax/bus.h | 12 +- drivers/dax/cxl.c | 53 ++ drivers/dax/device.c | 3 +- drivers/dax/hmem/Makefile | 3 +- drivers/dax/hmem/device.c | 102 ++-- drivers/dax/hmem/hmem.c | 148 +++++- drivers/dax/kmem.c | 5 +- drivers/nvdimm/bus.c | 19 +- drivers/nvdimm/dimm_devs.c | 5 +- drivers/nvdimm/nd-core.h | 1 + drivers/pci/probe.c | 1 + include/linux/dax.h | 7 +- include/linux/libnvdimm.h | 3 + include/linux/memregion.h | 2 + include/linux/pci.h | 1 + include/linux/range.h | 5 + include/trace/events/cxl.h | 112 ---- include/uapi/linux/cxl_mem.h | 30 +- include/uapi/linux/pci_regs.h | 1 + kernel/resource.c | 14 - lib/stackinit_kunit.c | 6 +- tools/testing/cxl/Kbuild | 9 + tools/testing/cxl/config_check.c | 1 + tools/testing/cxl/cxl_acpi_test.c | 6 + tools/testing/cxl/cxl_core_test.c | 6 + tools/testing/cxl/cxl_mem_test.c | 6 + tools/testing/cxl/cxl_pmem_test.c | 6 + tools/testing/cxl/cxl_port_test.c | 6 + tools/testing/cxl/test/Kbuild | 2 +- tools/testing/cxl/test/cxl.c | 165 +++++- tools/testing/cxl/test/mem.c | 352 +++++++++++++ tools/testing/cxl/test/mock.c | 36 +- tools/testing/cxl/test/mock.h | 6 +- tools/testing/cxl/watermark.h | 25 + 60 files changed, 3788 insertions(+), 740 deletions(-) create mode 100644 drivers/cxl/core/trace.c create mode 100644 drivers/cxl/core/trace.h create mode 100644 drivers/dax/cxl.c delete mode 100644 include/trace/events/cxl.h create mode 100644 tools/testing/cxl/cxl_acpi_test.c create mode 100644 tools/testing/cxl/cxl_core_test.c create mode 100644 tools/testing/cxl/cxl_mem_test.c create mode 100644 tools/testing/cxl/cxl_pmem_test.c create mode 100644 tools/testing/cxl/cxl_port_test.c create mode 100644 tools/testing/cxl/watermark.h