This series improves decoding of CXL 2.0 DVSEC registers by adding more DVSEC identifiers and adding fields for the existing decoded identifier. Not all DVSEC fields from 2.0 spec are enabled here, only enough for what we needed in driver bring-up. The restructuring of the code does make it easy to add support for the remaining fields. I submitted a PR for this on github a few months ago [1]. The spec is available for download [2]. Breakdown of patches: 1-5: Rework existing decoding to support more DVSEC IDs 6: Improve CXL Device Decoding (8.1.3 from CXL 2.0 spec) 7: Add port capabilities (8.1.5 from CXL 2.0 spec) 8: Add register locator (8.1.9 from CXL 2.0 spec) 9: Report undecoded DVSECs Here is an example decoded output of a 5.12 based kernel running in QEMU emulation [3] 36:00.0 Memory controller [0502]: Intel Corporation Device 0d93 (rev 01) (prog-if 10) Subsystem: Red Hat, Inc. Device 1100 <...> Capabilities: [100 v1] Designated Vendor-Specific: Vendor=1e98 ID=0000 Rev=1 Len=56: CXL CXLCap: Cache- IO+ Mem+ Mem HW Init+ HDMCount 1 Viral- CXLCtl: Cache- IO+ Mem+ Cache SF Cov 0 Cache SF Gran 0 Cache Clean- Viral- CXLSta: Viral- CXLSta2: ResetComplete+ ResetError- PMComplete- Cache Size Not Reported Range1: 10000000-fffffff Valid+ Active+ Type=CDAT Class=CDAT interleave=0 timeout=1s Range2: 0-ffffffffffffffff Valid- Active- Type=Volatile Class=DRAM interleave=0 timeout=1s Capabilities: [138 v1] Designated Vendor-Specific: Vendor=1e98 ID=0008 Rev=0 Len=36: CXL Block2 BIR: bar0 ID: component registers RegisterOffset: 0000000000000000 Block3 BIR: bar2 ID: CXL device registers RegisterOffset: 0000000000000000 Kernel driver in use: cxl_pci Ben Widawsky (9): cxl: Rename variable to match other code cxl: Make id check more explicit cxl: Collect all DVSEC Device fields cxl: Rework caps to new function cxl: Rename caps to be device caps cxl: Implement more device DVSEC decoding cxl: Add support for DVSEC port cap cxl: Add DVSEC Register Locator cxl: Add placeholder for undecoded DVSECs lib/header.h | 78 ++++++++++++++----- ls-ecaps.c | 206 ++++++++++++++++++++++++++++++++++++++++++++++----- 2 files changed, 249 insertions(+), 35 deletions(-) [1]: https://github.com/pciutils/pciutils/pull/59 [2]: https://www.computeexpresslink.org/download-the-specification [3]: https://gitlab.com/bwidawsk/qemu -- 2.31.1 -- 2.31.1
