From nobody Mon Feb 9 16:32:58 2026 Received: from out30-110.freemail.mail.aliyun.com (out30-110.freemail.mail.aliyun.com [115.124.30.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 302C5171C9; Sat, 24 Jan 2026 07:46:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.110 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769240793; cv=none; b=f7qrkJndjvr91QiF27aYi3uxv6PAVvjphKv9z9y3eNlEWejnrOHsSNkE2qZroLE+AGVW82517nrV9gL/B6JJ27C+DRXh6q4MJmlCUEzz09d/JupagB3NX4XP6cT0kS+aWyPyVXfN7GCvIaCmR64/MXzgQIuy9sDqo9wrDjZrRqo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769240793; c=relaxed/simple; bh=QJ8vCKcz1McGYRsdrAKJFHAVKZvVbELR6t+Nv0ULOPo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Xs9zRwxbIQLyqAuN5+miCyKZxO7ekHwoylwzdmjkzgTd5uxdAk1k7EaHv33dRLU2HHSMqscMlarPVCVWiO/Fs6/HGn0kkh1P8aw0bGUBpGjnL8C5yoWcz8yHgeG4v4lbpAm2BLDRrRdCN9DEGHqIjwpN/gXt36OGkkAwnzdRPWM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=Wy7bTqRD; arc=none smtp.client-ip=115.124.30.110 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="Wy7bTqRD" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1769240787; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=Lai+WgHyyBBA7L8Dsr49RmuA+H1xMDngo1aaMmEEBco=; b=Wy7bTqRDrcToZxm8nw8Z4XGqnuo97StG1UNGeT/LLdVb3LpyQ9cEucLkHVnZK7dUVm2NPjBs8RqqtSwWidtmD6/IDrTaLsZ6MkVnK+UtALCA/9cx6FdmSqs+s2BBB/neVINtXtReRaI1qFr7CPMs1KdSU7OkgGZUbk4VHx6vB5A= Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0WxiIIB1_1769240786 cluster:ay36) by smtp.aliyun-inc.com; Sat, 24 Jan 2026 15:46:26 +0800 From: Shuai Xue To: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, bhelgaas@google.com, kbusch@kernel.org, sathyanarayanan.kuppuswamy@linux.intel.com Cc: mahesh@linux.ibm.com, oohall@gmail.com, xueshuai@linux.alibaba.com, Jonathan.Cameron@huawei.com, terry.bowman@amd.com, tianruidong@linux.alibaba.com, lukas@wunner.de Subject: [PATCH v7 3/5] PCI/AER: Report fatal errors of RCiEP and EP if link recoverd Date: Sat, 24 Jan 2026 15:45:55 +0800 Message-Id: <20260124074557.73961-4-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20260124074557.73961-1-xueshuai@linux.alibaba.com> References: <20260124074557.73961-1-xueshuai@linux.alibaba.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" The AER driver has historically avoided reading the configuration space of an endpoint or RCiEP that reported a fatal error, considering the link to that device unreliable. Consequently, when a fatal error occurs, the AER and DPC drivers do not report specific error types, resulting in logs like: pcieport 0015:00:00.0: EDR: EDR event received pcieport 0015:00:00.0: EDR: Reported EDR dev: 0015:00:00.0 pcieport 0015:00:00.0: DPC: containment event, status:0x200d, ERR_FATAL r= eceived from 0015:01:00.0 pcieport 0015:00:00.0: AER: broadcast error_detected message pcieport 0015:00:00.0: AER: broadcast mmio_enabled message pcieport 0015:00:00.0: AER: broadcast resume message pcieport 0015:00:00.0: pciehp: Slot(21): Link Down/Up ignored pcieport 0015:00:00.0: AER: device recovery successful pcieport 0015:00:00.0: EDR: DPC port successfully recovered pcieport 0015:00:00.0: EDR: Status for 0015:00:00.0: 0x80 AER status registers are sticky and Write-1-to-clear. If the link recovered after hot reset, we can still safely access AER status and TLP header of the error device. In such case, report fatal errors which helps to figure out t= he error root case. After this patch, the logs like: pcieport 0015:00:00.0: EDR: EDR event received pcieport 0015:00:00.0: EDR: Reported EDR dev: 0015:00:00.0 pcieport 0015:00:00.0: DPC: containment event, status:0x200d, ERR_FATAL r= eceived from 0015:01:00.0 pcieport 0015:00:00.0: AER: broadcast error_detected message + vfio-pci 0015:01:00.0: AER: Errors reported prior to reset + vfio-pci 0015:01:00.0: PCIe Bus Error: severity=3DUncorrectable (Fatal), = type=3DTransaction Layer, (Receiver ID) + vfio-pci 0015:01:00.0: device [144d:a80a] error status/mask=3D00001000/= 00400000 + vfio-pci 0015:01:00.0: [12] TLP (First) + vfio-pci 0015:01:00.0: AER: TLP Header: 0x4a004010 0x00000040 0x0100000= 0 0xffffffff pcieport 0015:00:00.0: AER: broadcast mmio_enabled message pcieport 0015:00:00.0: AER: broadcast resume message pcieport 0015:00:00.0: pciehp: Slot(21): Link Down/Up ignored pcieport 0015:00:00.0: AER: device recovery successful pcieport 0015:00:00.0: EDR: DPC port successfully recovered pcieport 0015:00:00.0: EDR: Status for 0015:00:00.0: 0x80 Signed-off-by: Shuai Xue Reviewed-by: Jonathan Cameron Reviewed-by: Kuppuswamy Sathyanarayanan --- drivers/pci/pci.h | 4 +++- drivers/pci/pcie/aer.c | 32 ++++++++++++++++++++++++++++---- drivers/pci/pcie/dpc.c | 2 +- drivers/pci/pcie/err.c | 5 +++++ 4 files changed, 37 insertions(+), 6 deletions(-) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 58640e656897..bd020ba0cef0 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -746,8 +746,10 @@ struct aer_err_info { struct pcie_tlp_log tlp; /* TLP Header */ }; =20 -int aer_get_device_error_info(struct aer_err_info *info, int i); +int aer_get_device_error_info(struct aer_err_info *info, int i, + bool link_healthy); void aer_print_error(struct aer_err_info *info, int i); +void aer_report_frozen_error(struct pci_dev *dev); =20 int pcie_read_tlp_log(struct pci_dev *dev, int where, int where2, unsigned int tlp_len, bool flit, diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index e0bcaa896803..4c0a2bbe9197 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -1384,12 +1384,14 @@ EXPORT_SYMBOL_GPL(aer_recover_queue); * aer_get_device_error_info - read error status from dev and store it to = info * @info: pointer to structure to store the error record * @i: index into info->dev[] + * @link_healthy: link is healthy or not * * Return: 1 on success, 0 on error. * * Note that @info is reused among all error devices. Clear fields properl= y. */ -int aer_get_device_error_info(struct aer_err_info *info, int i) +int aer_get_device_error_info(struct aer_err_info *info, int i, + bool link_healthy) { struct pci_dev *dev; int type, aer; @@ -1420,7 +1422,8 @@ int aer_get_device_error_info(struct aer_err_info *in= fo, int i) } else if (type =3D=3D PCI_EXP_TYPE_ROOT_PORT || type =3D=3D PCI_EXP_TYPE_RC_EC || type =3D=3D PCI_EXP_TYPE_DOWNSTREAM || - info->severity =3D=3D AER_NONFATAL) { + info->severity =3D=3D AER_NONFATAL || + (info->severity =3D=3D AER_FATAL && link_healthy)) { =20 /* Link is still healthy for IO reads */ pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, @@ -1447,17 +1450,38 @@ int aer_get_device_error_info(struct aer_err_info *= info, int i) return 1; } =20 +void aer_report_frozen_error(struct pci_dev *dev) +{ + struct aer_err_info info; + int type =3D pci_pcie_type(dev); + + if (type !=3D PCI_EXP_TYPE_ENDPOINT && type !=3D PCI_EXP_TYPE_RC_END) + return; + + info.error_dev_num =3D 0; + info.severity =3D AER_FATAL; + info.level =3D KERN_ERR; + add_error_device(&info, dev); + + if (aer_get_device_error_info(&info, 0, true)) { + pci_err(dev, "Errors reported prior to reset\n"); + aer_print_error(&info, 0); + } + + pci_dev_put(dev); /* pairs with pci_dev_get() in add_error_device() */ +} + static inline void aer_process_err_devices(struct aer_err_info *e_info) { int i; =20 /* Report all before handling them, to not lose records by reset etc. */ for (i =3D 0; i < e_info->error_dev_num && e_info->dev[i]; i++) { - if (aer_get_device_error_info(e_info, i)) + if (aer_get_device_error_info(e_info, i, false)) aer_print_error(e_info, i); } for (i =3D 0; i < e_info->error_dev_num && e_info->dev[i]; i++) { - if (aer_get_device_error_info(e_info, i)) + if (aer_get_device_error_info(e_info, i, false)) handle_error_source(e_info->dev[i], e_info); } } diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index f6069f621683..21c4e8371279 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -284,7 +284,7 @@ struct pci_dev *dpc_process_error(struct pci_dev *pdev) pci_warn(pdev, "containment event, status:%#06x: unmasked uncorrectable = error detected\n", status); if (dpc_get_aer_uncorrect_severity(pdev, &info) && - aer_get_device_error_info(&info, 0)) { + aer_get_device_error_info(&info, 0, false)) { aer_print_error(&info, 0); pci_aer_clear_nonfatal_status(pdev); pci_aer_clear_fatal_status(pdev); diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c index bebe4bc111d7..0780ea09478b 100644 --- a/drivers/pci/pcie/err.c +++ b/drivers/pci/pcie/err.c @@ -253,6 +253,11 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev, pci_warn(bridge, "subordinate device reset failed\n"); goto failed; } + + /* Link recovered, report fatal errors of RCiEP or EP */ + if (state =3D=3D pci_channel_io_frozen) + aer_report_frozen_error(dev); + } =20 if (status =3D=3D PCI_ERS_RESULT_NEED_RESET) { --=20 2.39.3