Series status/background ======================== This is another RFC version of processing the CXL CPER records through the CXL trace mechanisms as Dan mentioned in [1]. This raises the cxl event structures to a core header and rearranges them such that they can be shared most efficiently. Thus eliminating a memcpy Smita noticed. Also BDF is used instead of serial number. NOTE: I'm still fuzzy on which fields in the CPER record are correct to find the BDF in the Linux code. It would be nice to double check those for me. The CPER code remains compile tested only. The original event code continues to pass cxl-test. [1] https://lore.kernel.org/all/6528808cef2ba_780ef294c5@xxxxxxxxxxxxxxxxxxxxxxxxx.notmuch/ Cover letter ============ CXL Component Events, as defined by EFI 2.10 Section N.2.14, wrap a mostly CXL event payload in an EFI Common Platform Error Record (CPER) record. If a device is configured for firmware first CXL event records are not sent directly to the host. The CXL sub-system uniquely has DPA to HPA translation information. It also already properly decodes the event format. Send the CXL CPER records to the CXL sub-system for processing. With CXL event logs the device interrupts the host with events. In the EFI case events are wrapped with device information which needs to be matched with memdev devices the CXL driver is tracking. A number of alternatives were considered to match the memdev with the CPER record. The most robust was to find the PCI device via Bus, Device, Function and match it to the memdev driver data. CPER records are identified with GUID's while CXL event logs contain UUID's. The UUID was previously printed for all events. But the UUID is redundant information which presents unnecessary complexity when processing CPER data. Remove the UUIDs from known events. Restructure the code to make sharing the data between CPER/event logs most efficient. Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> --- Changes in RFC v3: - djbw: Share structures between CPER/event logs - Smita: use BDF to resolve the memdev - djbw/Smita: various cleanups - Link to v2: https://lore.kernel.org/r/20230601-cxl-cper-v2-0-314d9c36ab02@xxxxxxxxx --- Ira Weiny (6): cxl/trace: Remove uuid from event trace known events cxl/events: Promote CXL event structures to a core header cxl/events: Remove UUID from non-generic event structures cxl/events: Create a CXL event union firmware/efi: Process CXL Component Events cxl/memdev: Register for and process CPER events drivers/cxl/core/mbox.c | 57 +++++++++----- drivers/cxl/core/trace.h | 18 ++--- drivers/cxl/cxlmem.h | 96 ++--------------------- drivers/cxl/pci.c | 59 +++++++++++++- drivers/firmware/efi/cper.c | 15 ++++ drivers/firmware/efi/cper_cxl.c | 40 ++++++++++ drivers/firmware/efi/cper_cxl.h | 29 +++++++ include/linux/cxl-event.h | 160 ++++++++++++++++++++++++++++++++++++++ tools/testing/cxl/test/mem.c | 166 +++++++++++++++++++++++----------------- 9 files changed, 451 insertions(+), 189 deletions(-) --- base-commit: 1c8b86a3799f7e5be903c3f49fcdaee29fd385b5 change-id: 20230601-cxl-cper-26ffc839c6c6 Best regards, -- Ira Weiny <ira.weiny@xxxxxxxxx>
