From: Shiju Jose <shiju.jose@xxxxxxxxxx> Support for CXL memory RAS features: patrol scrub, ECS, soft-PPR and memory sparing. This CXL series was part of the EDAC series [1]. The code is based on cxl.git next branch [2] merged with ras.git edac-cxl branch [3]. 1. https://lore.kernel.org/linux-cxl/20250212143654.1893-1-shiju.jose@xxxxxxxxxx/ 2. https://web.git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/log/?h=next 3. https://web.git.kernel.org/pub/scm/linux/kernel/git/ras/ras.git/log/?h=edac-cxl Userspace code for CXL memory repair features [4] and sample boot-script for CXL memory repair [5]. [4]: https://lore.kernel.org/lkml/20250207143028.1865-1-shiju.jose@xxxxxxxxxx/ [5]: https://lore.kernel.org/lkml/20250207143028.1865-5-shiju.jose@xxxxxxxxxx/ Changes ======= v1 -> v2: 1. Feedbacks from Dan Williams on v1, https://lore.kernel.org/linux-mm/20250307091137.00006a0a@xxxxxxxxxx/T/ - Fixed lock issues in region scrubbing, added local cxl_acquire() and cxl_unlock. - Replaced CXL examples using cat and echo from EDAC .rst docs with short description and ref to ABI docs. Also corrections in existing descriptions as suggested by Dan. - Add policy description for the scrub control feature. However this may require inputs from CXL experts. - Replaced CONFIG_CXL_RAS_FEATURES with CONFIG_CXL_EDAC_MEM_FEATURES. - Few changes to depends part of CONFIG_CXL_EDAC_MEM_FEATURES. - Rename drivers/cxl/core/memfeatures.c as drivers/cxl/core/edac.c - snprintf() -> kasprintf() in few places. 2. Feedbacks from Alison on v1, - In cxl_get_feature_entry()(patch 1), return NULL on failures and reintroduced checks in cxl_get_feature_entry(). - Changed logic in for loop in region based scrubbing code. - Replace cxl_are_decoders_committed() to cxl_is_memdev_memory_online() and add as a local function to drivers/cxl/core/edac.c - Changed few multiline comments to single line comments. - Removed unnecessary comments from the code. - Reduced line length of few macros in ECS and memory repair code. - In new files, changed "GPL-2.0-or-later" -> "GPL-2.0-only". - Ran clang-format for new files and updated. 3. Changes for feedbacks from Jonathan on v1. - Changed few multiline comments to single line comments. Shiju Jose (8): cxl: Add helper function to retrieve a feature entry EDAC: Update documentation for the CXL memory patrol scrub control feature cxl/edac: Add CXL memory device patrol scrub control feature cxl/edac: Add CXL memory device ECS control feature cxl/mbox: Add support for PERFORM_MAINTENANCE mailbox command cxl: Support for finding memory operation attributes from the current boot cxl/memfeature: Add CXL memory device soft PPR control feature cxl/memfeature: Add CXL memory device memory sparing control feature Documentation/edac/memory_repair.rst | 31 + Documentation/edac/scrub.rst | 47 + drivers/cxl/Kconfig | 27 + drivers/cxl/core/Makefile | 1 + drivers/cxl/core/core.h | 2 + drivers/cxl/core/edac.c | 1730 ++++++++++++++++++++++++++ drivers/cxl/core/features.c | 23 + drivers/cxl/core/mbox.c | 45 +- drivers/cxl/core/memdev.c | 9 + drivers/cxl/core/ras.c | 145 +++ drivers/cxl/core/region.c | 5 + drivers/cxl/cxlmem.h | 73 ++ drivers/cxl/mem.c | 4 + drivers/cxl/pci.c | 3 + drivers/edac/mem_repair.c | 9 + include/linux/edac.h | 7 + 16 files changed, 2159 insertions(+), 2 deletions(-) create mode 100644 drivers/cxl/core/edac.c -- 2.43.0
