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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 , Sunil V L , Xiaofei Tan , Mario Limonciello , Huacai Chen , Heinrich Schuchardt , Arnd Bergmann , "Fabio M . De Francesco" , Peter Zijlstra , Ingo Molnar , Guo Weikang , Xin Li , Will Deacon , Huang Yiwei , Gavin Shan , Smita Koralahalli , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Li Ming , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Kuppuswamy Sathyanarayanan , Karolina Stolarek , Jon Pan-Doh , Lukas Wunner , Shiju Jose , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org Subject: [PATCH 2/6 v6] ACPI: extlog: Trace CPER PCI Express Error Section Date: Thu, 23 Oct 2025 14:25:37 +0200 Message-ID: <20251023122612.1326748-3-fabio.m.de.francesco@linux.intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251023122612.1326748-1-fabio.m.de.francesco@linux.intel.com> References: <20251023122612.1326748-1-fabio.m.de.francesco@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" I/O Machine Check Architecture events may signal failing PCIe components or links. The AER event contains details on what was happening on the wire when the error was signaled. Trace the CPER PCIe Error section (UEFI v2.10, Appendix N.2.7) reported by the I/O MCA. Cc: Dan Williams Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Signed-off-by: Fabio M. De Francesco --- drivers/acpi/Kconfig | 1 + drivers/acpi/acpi_extlog.c | 32 ++++++++++++++++++++++++++++++++ drivers/pci/pcie/aer.c | 2 +- 3 files changed, 34 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index ca00a5dbcf75..f8a97db075fc 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -494,6 +494,7 @@ config ACPI_EXTLOG tristate "Extended Error Log support" depends on X86_MCE && X86_LOCAL_APIC && EDAC select UEFI_CPER + select ACPI_APEI_PCIEAER 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 47d11cb5c912..cefe8d2d8aff 100644 --- a/drivers/acpi/acpi_extlog.c +++ b/drivers/acpi/acpi_extlog.c @@ -132,6 +132,34 @@ static int print_extlog_rcd(const char *pfx, return 1; } =20 +static void extlog_print_pcie(struct cper_sec_pcie *pcie_err, + int severity) +{ + struct aer_capability_regs *aer; + struct pci_dev *pdev; + unsigned int devfn; + unsigned int bus; + int aer_severity; + int domain; + + if (!(pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID || + pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO)) + return; + + aer_severity =3D cper_severity_to_aer(severity); + aer =3D (struct aer_capability_regs *)pcie_err->aer_info; + domain =3D pcie_err->device_id.segment; + bus =3D pcie_err->device_id.bus; + devfn =3D PCI_DEVFN(pcie_err->device_id.device, + pcie_err->device_id.function); + pdev =3D pci_get_domain_bus_and_slot(domain, bus, devfn); + if (!pdev) + return; + + pci_print_aer(pdev, aer_severity, aer); + pci_dev_put(pdev); +} + static int extlog_print(struct notifier_block *nb, unsigned long val, void *data) { @@ -183,6 +211,10 @@ static int extlog_print(struct notifier_block *nb, uns= igned long val, if (gdata->error_data_length >=3D 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_PCIE)) { + struct cper_sec_pcie *pcie_err =3D acpi_hest_get_payload(gdata); + + extlog_print_pcie(pcie_err, gdata->error_severity); } else { void *err =3D acpi_hest_get_payload(gdata); =20 diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index 0b5ed4722ac3..1b903e0644d6 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -971,7 +971,7 @@ void pci_print_aer(struct pci_dev *dev, int aer_severit= y, pcie_print_tlp_log(dev, &aer->header_log, info.level, dev_fmt(" ")); } -EXPORT_SYMBOL_NS_GPL(pci_print_aer, "CXL"); +EXPORT_SYMBOL_GPL(pci_print_aer); =20 /** * add_error_device - list device to be handled --=20 2.51.0