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De Francesco" To: linux-cxl@vger.kernel.org Cc: Rafael J Wysocki , Len Brown , Tony Luck , Borislav Petkov , Hanjun Guo , Mauro Carvalho Chehab , Shuai Xue , Davidlohr Bueso , Jonathan Cameron , Dave Jiang , Alison Schofield , Vishal Verma , Ira Weiny , Dan Williams , Mahesh J Salgaonkar , Oliver O'Halloran , Bjorn Helgaas , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, "Fabio M. De Francesco" , Kuppuswamy Sathyanarayanan Subject: [PATCH 5/5 v9] ACPI: extlog: Trace CPER CXL Protocol Error Section Date: Wed, 14 Jan 2026 11:14:25 +0100 Message-ID: <20260114101543.85926-6-fabio.m.de.francesco@linux.intel.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260114101543.85926-1-fabio.m.de.francesco@linux.intel.com> References: <20260114101543.85926-1-fabio.m.de.francesco@linux.intel.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When Firmware First is enabled, BIOS handles errors first and then it makes them available to the kernel via the Common Platform Error Record (CPER) sections (UEFI 2.11 Appendix N.2.13). Linux parses the CPER sections via one of two similar paths, either ELOG or GHES. The errors managed by ELOG are signaled to the BIOS by the I/O Machine Check Architecture (I/O MCA). Currently, ELOG and GHES show some inconsistencies in how they report to userspace via trace events. Therefore, make the two mentioned paths act similarly by tracing the CPER CXL Protocol Error Section. Cc: Dan Williams Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Reviewed-by: Kuppuswamy Sathyanarayanan Signed-off-by: Fabio M. De Francesco --- drivers/acpi/Kconfig | 2 ++ drivers/acpi/acpi_extlog.c | 24 ++++++++++++++++++++++++ drivers/cxl/core/ras.c | 3 ++- include/cxl/event.h | 2 ++ 4 files changed, 30 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index ca00a5dbcf750..df0ff0764d0d5 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -494,6 +494,8 @@ config ACPI_EXTLOG tristate "Extended Error Log support" depends on X86_MCE && X86_LOCAL_APIC && EDAC select UEFI_CPER + select ACPI_APEI + select ACPI_APEI_GHES help Certain usages such as Predictive Failure Analysis (PFA) require more information about the error than what can be described in diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c index 88a2237772c26..7ad3b36013cc6 100644 --- a/drivers/acpi/acpi_extlog.c +++ b/drivers/acpi/acpi_extlog.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -162,6 +163,23 @@ static void extlog_print_pcie(struct cper_sec_pcie *pcie_err, #endif } +static void +extlog_cxl_cper_handle_prot_err(struct cxl_cper_sec_prot_err *prot_err, + int severity) +{ +#ifdef ACPI_APEI_PCIEAER + struct cxl_cper_prot_err_work_data wd; + + if (cxl_cper_sec_prot_err_valid(prot_err)) + return; + + if (cxl_cper_setup_prot_err_work_data(&wd, prot_err, severity)) + return; + + cxl_cper_handle_prot_err(&wd); +#endif +} + static int extlog_print(struct notifier_block *nb, unsigned long val, void *data) { @@ -213,6 +231,12 @@ static int extlog_print(struct notifier_block *nb, unsigned long val, if (gdata->error_data_length >= sizeof(*mem)) trace_extlog_mem_event(mem, err_seq, fru_id, fru_text, (u8)gdata->error_severity); + } else if (guid_equal(sec_type, &CPER_SEC_CXL_PROT_ERR)) { + struct cxl_cper_sec_prot_err *prot_err = + acpi_hest_get_payload(gdata); + + extlog_cxl_cper_handle_prot_err(prot_err, + gdata->error_severity); } else if (guid_equal(sec_type, &CPER_SEC_PCIE)) { struct cper_sec_pcie *pcie_err = acpi_hest_get_payload(gdata); diff --git a/drivers/cxl/core/ras.c b/drivers/cxl/core/ras.c index 2731ba3a07993..a90480d07c878 100644 --- a/drivers/cxl/core/ras.c +++ b/drivers/cxl/core/ras.c @@ -63,7 +63,7 @@ static int match_memdev_by_parent(struct device *dev, const void *uport) return 0; } -static void cxl_cper_handle_prot_err(struct cxl_cper_prot_err_work_data *data) +void cxl_cper_handle_prot_err(struct cxl_cper_prot_err_work_data *data) { unsigned int devfn = PCI_DEVFN(data->prot_err.agent_addr.device, data->prot_err.agent_addr.function); @@ -104,6 +104,7 @@ static void cxl_cper_handle_prot_err(struct cxl_cper_prot_err_work_data *data) else cxl_cper_trace_uncorr_prot_err(cxlmd, data->ras_cap); } +EXPORT_SYMBOL_GPL(cxl_cper_handle_prot_err); static void cxl_cper_prot_err_work_fn(struct work_struct *work) { diff --git a/include/cxl/event.h b/include/cxl/event.h index 94081aec597ae..ff97fea718d2c 100644 --- a/include/cxl/event.h +++ b/include/cxl/event.h @@ -340,4 +340,6 @@ cxl_cper_setup_prot_err_work_data(struct cxl_cper_prot_err_work_data *wd, } #endif +void cxl_cper_handle_prot_err(struct cxl_cper_prot_err_work_data *wd); + #endif /* _LINUX_CXL_EVENT_H */ -- 2.52.0