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[81.98.232.178]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47aa0960816sm10478477f8f.29.2026.07.04.15.08.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 04 Jul 2026 15:08:18 -0700 (PDT) From: shijujose2008@gmail.com To: rafael@kernel.org, bp@alien8.de, akpm@linux-foundation.org, rppt@kernel.org, dferguson@amperecomputing.com, linux-edac@vger.kernel.org, linux-acpi@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, tony.luck@intel.com, lenb@kernel.org, leo.duran@amd.com, Yazen.Ghannam@amd.com, mchehab@kernel.org Cc: jic23@kernel.org, linuxarm@huawei.com, rientjes@google.com, jiaqiyan@google.com, Jon.Grimm@amd.com, dave.hansen@linux.intel.com, naoya.horiguchi@nec.com, james.morse@arm.com, jthoughton@google.com, somasundaram.a@hpe.com, erdemaktas@google.com, pgonda@google.com, duenwen@google.com, gthelen@google.com, wschwartz@amperecomputing.com, wbs@os.amperecomputing.com, nifan.cxl@gmail.com, tanxiaofei@huawei.com, prime.zeng@hisilicon.com, roberto.sassu@huawei.com, kangkang.shen@futurewei.com, wanghuiqiang@huawei.com, shijujose2008@gmail.com Subject: [PATCH v20 0/2] ACPI: Add support for ACPI RAS2 feature table Date: Sat, 4 Jul 2026 23:07:43 +0100 Message-Id: <20260704220745.110773-1-shijujose2008@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 18CD8140004 X-Stat-Signature: h6q876sdy3ecnhri9k8trjzh6f5pg8qk X-HE-Tag: 1783202900-867837 X-HE-Meta: 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 FH0IbCFy 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Shiju Jose Add support for ACPI RAS2 feature table (RAS2) defined in the ACPI 6.5 specification, section 5.2.21 and RAS2 HW based memory scrubbing feature. ACPI RAS2 patches were part of the EDAC series [1]. The code is based on linux.git v7.2-rc1 [2]. 1. https://lore.kernel.org/linux-cxl/20250212143654.1893-1-shiju.jose@huawei.com/ 2. https://github.com/torvalds/linux.git Changes ======= v19 -> v20: 1. Added possible fixes for gemini AI reported issues shared by Borislav. Thanks. https://sashiko.dev/#/patchset/20260408172850.183-1-shiju.jose%40huawei.com Unfortunately could not get a local sashiko review setup to verify the fixes before posting patches. v18 -> v19: 1. Fixed gemini tool reported issues sent by Borislav. Thanks. https://sashiko.dev/#/patchset/20260325165714.294-1-shiju.jose%40huawei.com - Replace with iowriteX() and ioreadX() for reading fields in RAS2 shared memory tables throughout patches considering big-endian architectures. - In ras2_send_pcc_cmd(), add extra check for non-zero last_mpar_reset, changed time_delta to s64, add lockdep_assert_held(). - In register_pcc_channel(), handled case of pcc_chan->latency is 0 and fixed timeout of 0 to readw_relaxed_poll_timeout(). - Fixed double free case When auxiliary_device_add() fails, the driver calls auxiliary_device_uninit(&ras2_ctx->adev). - In parse_ras2_table(), add check to verify table length is large enough to contain the num_pcc_descs elements it iterates over. - Add some missing cases to acquire pcc_lock, such as ras2_hw_scrub_read_addr() and ras2_hw_scrub_read_size(). - Removed clearing base and size in ras2_scrub_monitor_thread() when demand scrubbing has finished, to avoid clearing the user set values, though chances are very little. - Add new field set_scrub_cycle to ras2_ctx to avoid user set value is being cleared when ras2_update_patrol_scrub_params_cache() is being called. - In ras2_hw_scrub_set_enabled_od(), redesigned to avoid prematurely restart the background scrub due to race condition in ras2_scrub_monitor_thread(). - rename ras2_probe() to ras2_mem_drv_probe() - add ras2_mem_drv_remove() and call kthread_stop() to stop the ras2_scrub_monitor_thread(). However unregistering the EDAC device which registered in the ras2_mem_drv_probe() will automatically happen in the EDAC via the devm_add_action_or_reset() in edac_dev_register(), edac_dev_unreg() and edac_dev_release(). v17 -> v18: 1. Fixed few AI tool reported issues shared by Borislav. Thanks. https://lore.kernel.org/all/20260312165247.GSabLvX5DjzhDtmyuh@fat_crate.local/ 2. Re-add support for user setting scrub address range for Daniel's reply in v16, which was removed in v13 because of request to simplify the code and with the expectation that the firmware will do the full node demand scrubbing and may enable these attributes later in the follow-up patches. https://lore.kernel.org/all/df5fe0ed-3483-4ac5-8096-447e4e560816@os.amperecomputing.com/ v16 -> v17: 1. Merged all changes suggested by Borislav. https://lore.kernel.org/all/20260126171552.GJaXehSJp33nFnpvVd@fat_crate.local/ 2. Changes for Borislav's feedback "Add remove_aux_device() which unwinds everything add_aux_device() does for all those devices". v15 -> v16: Attempt to modify throughout the code and logs for the below comments from Borislav. Thanks for the comments. https://lore.kernel.org/all/20251125073627.GLaSVce7hBqGH1a3ni@fat_crate.local/ https://lore.kernel.org/all/20251231131512.GBaVUh4NSWqvr2xhbM@fat_crate.local/ https://lore.kernel.org/all/20260119111701.GBaW4Sres045xnfkpz@fat_crate.local/ v14 -> v15: 1. Incorporated new changes suggested by Borislav on v13. https://lore.kernel.org/all/20251231131512.GBaVUh4NSWqvr2xhbM@fat_crate.local/ 2. Rebase to v6.19-rc5. v13 -> v14: 1. Modifications for changes wanted by Borislav. https://lore.kernel.org/all/20251125073627.GLaSVce7hBqGH1a3ni@fat_crate.local/ 2. Changes for the comments from Randy Dunlap https://lore.kernel.org/all/4807417b-a8f7-47a3-b38a-94ea7bdbf775@infradead.org/ https://lore.kernel.org/all/af7b6cdc-c0a7-4896-ba6b-6bb933898d37@infradead.org/ https://lore.kernel.org/all/26083ba9-1979-4d14-8465-3f54f2f96d23@infradead.org/ v12 -> v13: 1. Fixed some bugs reported and changes wanted by Borislav. https://lore.kernel.org/all/20250910192707.GAaMHRCxWx37XitN3t@fat_crate.local/ 2. Tried modifying the patch header as commented by Borislav. 3. Fixed a bug reported by Yazen. https://lore.kernel.org/all/20250909162434.GB11602@yaz-khff2.amd.com/ 4. Changed setting 'Requested Address Range' for GET_PATROL_PARAMETERS command to meet the requirements from Daniel for Ampere Computing platform. https://lore.kernel.org/all/7a211c5c-174c-438b-9a98-fd47b057ea4a@os.amperecomputing.com/ 5. In RAS2 driver, removed support for scrub control attributes 'addr' and 'size' for the time being with the expectation that a firmware will do the full node demand scrubbing and may enable these attributes in the future. 6. Add 'enable_demand' attribute to the EDAC scrub interface to start/stop the demand scrub, which is used for the RAS2 demand scrub control. v11 -> v12: 1. Modified logic for finding the lowest contiguous phy memory addr range for NUMA domain using node_start_pfn() and node_spanned_pages() according to the feedback from Mike Rapoport in v11. https://lore.kernel.org/all/aKsIlFTkBsAF5sqD@kernel.org/ 2. Rebase to 6.17-rc4. v10 -> v11: 1. Simplified code by removing workarounds previously added to support non-compliant case of single PCC channel shared across all proximity domains (which is no longer required). https://lore.kernel.org/all/f5b28977-0b80-4c39-929b-cf02ab1efb97@os.amperecomputing.com/ 2. Fix for the comments from Borislav (Thanks). https://lore.kernel.org/all/20250811152805.GQaJoMBecC4DSDtTAu@fat_crate.local/ 3. Rebase to 6.17-rc1. v9 -> v10: 1. Use pcc_chan->shmem instead of acpi_os_ioremap(pcc_chan->shmem_base_addr,...) as it was acpi_os_ioremap internally by the PCC driver to pcc_chan->shmem. 2. Changes required for the Ampere Computing system where uses a single PCC channel for RAS2 memory features across all NUMA domains. Based on the requirements from by Daniel on V9 https://lore.kernel.org/all/547ed8fb-d6b7-4b6b-a38b-bf13223971b1@os.amperecomputing.com/ and discussion with Jonathan. 2.1 Add node_to_range lookup facility to numa_memblks. This is to retrieve the lowest physical continuous memory range of the memory associated with a NUMA domain. 2.2. Set requested addr range to the memory region's base addr and size while send RAS2 cmd GET_PATROL_PARAMETER in functions ras2_update_patrol_scrub_params_cache() & ras2_get_patrol_scrub_running(). 2.3. Split struct ras2_mem_ctx into struct ras2_mem_ctx_hdr and struct ras2_pxm_domain to support cases, uses a single PCC channel for RAS2 scrubbers across all NUMA domains and PCC channel per RAS2 scrub instance. Provided ACPI spec define single memory scrub per NUMA domain. 2.4. EDAC feature sysfs folder for RAS2 changed from "acpi_ras_memX" to "acpi_ras_mem_idX" because memory scrub instances across all NUMA domains would present under "acpi_ras_mem_id0" when a system uses a single PCC channel for RAS2 scrubbers across all NUMA domains etc. 2.5. Removed Acked-by: Rafael from patch [2], because of the several above changes from v9. v8 -> v9: 1. Added following changes for feedback from Yazen. 1.1 In ras2_check_pcc_chan(..) function - u32 variables moved to the same line. - Updated error log for readw_relaxed_poll_timeout() - Added error log for if (status & PCC_STATUS_ERROR), error condition. - Removed an impossible condition check. 1.2. Added guard for ras2_pc_list_lock in ras2_get_pcc_subspace(). 2. Rebased to linux.git v6.16-rc2 [2]. v7 -> v8: 1. Rebased to linux.git v6.16-rc1 [2]. v6 -> v7: 1. Fix for the issue reported by Daniel, In ras2_check_pcc_chan(), add read, clear and check RAS2 set_cap_status outside if (status & PCC_STATUS_ERROR) check. https://lore.kernel.org/all/51bcb52c-4132-4daf-8903-29b121c485a1@os.amperecomputing.com/ v5 -> v6: 1. Fix for the issue reported by Daniel, in start scrubbing with correct addr and size after firmware return INVALID DATA error for scrub request with invalid addr or size. https://lore.kernel.org/all/8cdf7885-31b3-4308-8a7c-f4e427486429@os.amperecomputing.com/ v4 -> v5: 1. Fix for the build warnings reported by kernel test robot. https://patchwork.kernel.org/project/linux-edac/patch/20250423163511.1412-3-shiju.jose@huawei.com/ 2. Removed patch "ACPI: ACPI 6.5: RAS2: Rename RAS2 table structure and field names" from the series as the patch was merged to linux-pm.git : branch linux-next 3. Rebased to ras.git: edac-for-next branch merged with linux-pm.git : linux-next branch. v3 -> v4: 1. Changes for feedbacks from Yazen on v3. https://lore.kernel.org/all/20250415210504.GA854098@yaz-khff2.amd.com/ v2 -> v3: 1. Rename RAS2 table structure and field names in include/acpi/actbl2.h limited to only necessary for RAS2 scrub feature. 2. Changes for feedbacks from Jonathan on v2. 3. Daniel reported a known behaviour: when readback 'size' attribute after setting in, returns 0 before starting scrubbing via 'addr' attribute. Changes added to fix this. 4. Daniel reported that firmware cannot update status of demand scrubbing via the 'Actual Address Range (OUTPUT)', thus add workaround in the kernel to update sysfs 'addr' attribute with the status of demand scrubbing. 5. Optimized logic in ras2_check_pcc_chan() function (patch - ACPI:RAS2: Add ACPI RAS2 driver). 6. Add PCC channel lock to struct ras2_pcc_subspace and change lock in ras2_mem_ctx as a pointer to pcc channel lock to make sure writing to PCC subspace shared memory is protected from race conditions. v1 -> v2: 1. Changes for feedbacks from Borislav. - Shorten ACPI RAS2 structures and variables names. - Shorten some of the other variables in the RAS2 drivers. - Fixed few CamelCases. 2. Changes for feedbacks from Yazen. - Added newline after number of '}' and return statements. - Changed return type for "ras2_add_aux_device() to 'int'. - Deleted a duplication of acpi_get_table("RAS2",...) in the ras2_acpi_parse_table(). - Add "FW_WARN" to few error logs in the ras2_acpi_parse_table(). - Rename ras2_acpi_init() to acpi_ras2_init() and modified to call acpi_ras2_init() function from the acpi_init(). - Moved scrub related variables from the struct ras2_mem_ctx from patch "ACPI:RAS2: Add ACPI RAS2 driver" to "ras: mem: Add memory ACPI RAS2 driver". Shiju Jose (2): ACPI:RAS2: Add driver for the ACPI RAS2 feature table ras: mem: Add ACPI RAS2 memory driver Documentation/ABI/testing/sysfs-edac-scrub | 14 +- Documentation/edac/scrub.rst | 70 +++ drivers/acpi/Kconfig | 11 + drivers/acpi/Makefile | 1 + drivers/acpi/bus.c | 3 + drivers/acpi/ras2.c | 509 +++++++++++++++++++ drivers/edac/scrub.c | 12 + drivers/ras/Kconfig | 13 + drivers/ras/Makefile | 1 + drivers/ras/acpi_ras2.c | 562 +++++++++++++++++++++ include/acpi/ras2.h | 86 ++++ include/linux/edac.h | 4 + 12 files changed, 1281 insertions(+), 5 deletions(-) create mode 100644 drivers/acpi/ras2.c create mode 100644 drivers/ras/acpi_ras2.c create mode 100644 include/acpi/ras2.h -- 2.25.1