linux-kernel - [PATCH 2/2] PCI/AER: Log correctable errors as warning, not error

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Date:   Tue,  7 Jul 2020 19:14:01 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Matt Jolly <Kangie@...tclan.ninja>
Cc:     Russell Currey <ruscur@...sell.cc>,
        Sam Bobroff <sbobroff@...ux.ibm.com>,
        Oliver O'Halloran <oohall@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 2/2] PCI/AER: Log correctable errors as warning, not error

From: Matt Jolly <Kangie@...tclan.ninja>

PCIe correctable errors are recovered by hardware with no need for software
intervention (PCIe r5.0, sec 6.2.2.1).

Reduce the log level of correctable errors from KERN_ERR to KERN_WARNING.

The bug reports below are for correctable error logging.  This doesn't fix
the cause of those reports, but it may make the messages less alarming.

[bhelgaas: commit log, use pci_printk() to avoid code duplication]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=201517
Link: https://bugzilla.kernel.org/show_bug.cgi?id=196183
Link: https://lore.kernel.org/r/20200618155511.16009-1-Kangie@footclan.ninja
Signed-off-by: Matt Jolly <Kangie@...tclan.ninja>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/pci/pcie/aer.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 9176c8a968b9..ca886bf91fd9 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -673,20 +673,23 @@ static void __aer_print_error(struct pci_dev *dev,
 {
 	const char **strings;
 	unsigned long status = info->status & ~info->mask;
-	const char *errmsg;
+	const char *level, *errmsg;
 	int i;
 
-	if (info->severity == AER_CORRECTABLE)
+	if (info->severity == AER_CORRECTABLE) {
 		strings = aer_correctable_error_string;
-	else
+		level = KERN_WARNING;
+	} else {
 		strings = aer_uncorrectable_error_string;
+		level = KERN_ERR;
+	}
 
 	for_each_set_bit(i, &status, 32) {
 		errmsg = strings[i];
 		if (!errmsg)
 			errmsg = "Unknown Error Bit";
 
-		pci_err(dev, "   [%2d] %-22s%s\n", i, errmsg,
+		pci_printk(level, dev, "   [%2d] %-22s%s\n", i, errmsg,
 				info->first_error == i ? " (First)" : "");
 	}
 	pci_dev_aer_stats_incr(dev, info);
@@ -696,6 +699,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
 {
 	int layer, agent;
 	int id = ((dev->bus->number << 8) | dev->devfn);
+	const char *level;
 
 	if (!info->status) {
 		pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible, (Unregistered Agent ID)\n",
@@ -706,13 +710,14 @@ 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);
 
-	pci_err(dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
-		aer_error_severity_string[info->severity],
-		aer_error_layer[layer], aer_agent_string[agent]);
+	level = (info->severity == AER_CORRECTABLE) ? KERN_WARNING : KERN_ERR;
+
+	pci_printk(level, dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
+		   aer_error_severity_string[info->severity],
+		   aer_error_layer[layer], aer_agent_string[agent]);
 
-	pci_err(dev, "  device [%04x:%04x] error status/mask=%08x/%08x\n",
-		dev->vendor, dev->device,
-		info->status, info->mask);
+	pci_printk(level, dev, "  device [%04x:%04x] error status/mask=%08x/%08x\n",
+		   dev->vendor, dev->device, info->status, info->mask);
 
 	__aer_print_error(dev, info);
 
-- 
2.25.1