linux-kernel - [PATCHv2 pci-next 1/2] PCI/AER: correctable error message as KERN

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Date:   Fri, 17 Mar 2023 10:51:08 -0700
From:   Grant Grundler <grundler@...omium.org>
To:     Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        "Oliver O \ 'Halloran" <oohall@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Rajat Khandelwal <rajat.khandelwal@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rajat Jain <rajatja@...omium.org>,
        Grant Grundler <grundler@...omium.org>
Subject: [PATCHv2 pci-next 1/2] PCI/AER: correctable error message as KERN_INFO

Since correctable errors have been corrected (and counted), the dmesg output
should not be reported as a warning, but rather as "informational".

Otherwise, using a certain well known vendor's PCIe parts in a USB4 docking
station, the dmesg buffer can be spammed with correctable errors, 717 bytes
per instance, potentially many MB per day.

Given the "WARN" priority, these messages have already confused the typical
user that stumbles across them, support staff (triaging feedback reports),
and more than a few linux kernel devs. Changing to INFO will hide these
messages from most audiences.

Signed-off-by: Grant Grundler <grundler@...omium.org>
---
 drivers/pci/pcie/aer.c | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index f6c24ded134c..cb6b96233967 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -687,23 +687,29 @@ static void __aer_print_error(struct pci_dev *dev,
 {
 	const char **strings;
 	unsigned long status = info->status & ~info->mask;
-	const char *level, *errmsg;
 	int i;
 
 	if (info->severity == AER_CORRECTABLE) {
 		strings = aer_correctable_error_string;
-		level = KERN_WARNING;
+		pci_info(dev, "aer_status: 0x%08x, aer_mask: 0x%08x\n",
+			info->status, info->mask);
 	} else {
 		strings = aer_uncorrectable_error_string;
-		level = KERN_ERR;
+		pci_err(dev, "aer_status: 0x%08x, aer_mask: 0x%08x\n",
+			info->status, info->mask);
 	}
 
 	for_each_set_bit(i, &status, 32) {
-		errmsg = strings[i];
+		const char *errmsg = strings[i];
+
 		if (!errmsg)
 			errmsg = "Unknown Error Bit";
 
-		pci_printk(level, dev, "   [%2d] %-22s%s\n", i, errmsg,
+		if (info->severity == AER_CORRECTABLE)
+			pci_info(dev, "   [%2d] %-22s%s\n", i, errmsg,
+				info->first_error == i ? " (First)" : "");
+		else
+			pci_err(dev, "   [%2d] %-22s%s\n", i, errmsg,
 				info->first_error == i ? " (First)" : "");
 	}
 	pci_dev_aer_stats_incr(dev, info);
@@ -724,7 +730,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
 	layer = AER_GET_LAYER_ERROR(info->severity, info->status);
 	agent = AER_GET_AGENT(info->severity, info->status);
 
-	level = (info->severity == AER_CORRECTABLE) ? KERN_WARNING : KERN_ERR;
+	level = (info->severity == AER_CORRECTABLE) ? KERN_INFO : KERN_ERR;
 
 	pci_printk(level, dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
 		   aer_error_severity_string[info->severity],
@@ -797,14 +803,17 @@ void cper_print_aer(struct pci_dev *dev, int aer_severity,
 	info.mask = mask;
 	info.first_error = PCI_ERR_CAP_FEP(aer->cap_control);
 
-	pci_err(dev, "aer_status: 0x%08x, aer_mask: 0x%08x\n", status, mask);
 	__aer_print_error(dev, &info);
-	pci_err(dev, "aer_layer=%s, aer_agent=%s\n",
-		aer_error_layer[layer], aer_agent_string[agent]);
 
-	if (aer_severity != AER_CORRECTABLE)
+	if (aer_severity == AER_CORRECTABLE) {
+		pci_info(dev, "aer_layer=%s, aer_agent=%s\n",
+			aer_error_layer[layer], aer_agent_string[agent]);
+	} else {
+		pci_err(dev, "aer_layer=%s, aer_agent=%s\n",
+			aer_error_layer[layer], aer_agent_string[agent]);
 		pci_err(dev, "aer_uncor_severity: 0x%08x\n",
 			aer->uncor_severity);
+	}
 
 	if (tlp_header_valid)
 		__print_tlp_header(dev, &aer->header_log);
-- 
2.40.0.rc1.284.g88254d51c5-goog