[PATCH v6 11/16] PCI/AER: Check log level once and remember it

Bjorn Helgaas
2025-05-19T21:37:08Z

From: Karolina Stolarek <karolina.stolarek@oracle.com>

When reporting an AER error, we check its type multiple times to determine
the log level for each message. Do this check only in the top-level
functions (aer_isr_one_error(), pci_print_aer()) and save the level in
struct aer_err_info.

[bhelgaas: save log level in struct aer_err_info instead of passing it
as a parameter]
Link: https://lore.kernel.org/r/20250321015806.954866-2-pandoh@google.com
Signed-off-by: Karolina Stolarek <karolina.stolarek@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/pci.h | 1 +
drivers/pci/pcie/aer.c | 21 ++++++++++-----------
drivers/pci/pcie/dpc.c | 1 +
3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index b81e99cd4b62..705f9ef58acc 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -588,6 +588,7 @@ static inline bool pci_dev_test_and_set_removed(struct pci_dev *dev)
struct aer_err_info {
struct pci_dev *dev[AER_MAX_MULTI_ERR_DEVICES];
int error_dev_num;
+ const char *level; /* printk level */

unsigned int id:16;

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 4683a99c7568..73b03a195b14 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -672,21 +672,18 @@ static void pci_rootport_aer_stats_incr(struct pci_dev *pdev,
}
}

-static void __aer_print_error(struct pci_dev *dev,
- struct aer_err_info *info)
+static void __aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
{
const char **strings;
unsigned long status = info->status & ~info->mask;
- const char *level, *errmsg;
+ const char *level = info->level;
+ const char *errmsg;
int i;

- if (info->severity == AER_CORRECTABLE) {
+ if (info->severity == AER_CORRECTABLE)
strings = aer_correctable_error_string;
- level = KERN_WARNING;
- } else {
+ else
strings = aer_uncorrectable_error_string;
- level = KERN_ERR;
- }

for_each_set_bit(i, &status, 32) {
errmsg = strings[i];
@@ -714,7 +711,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
{
int layer, agent;
int id = pci_dev_id(dev);
- const char *level;
+ const char *level = info->level;

pci_dev_aer_stats_incr(dev, info);

@@ -727,8 +724,6 @@ 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;
-
aer_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]);
@@ -774,9 +769,11 @@ void pci_print_aer(struct pci_dev *dev, int aer_severity,
if (aer_severity == AER_CORRECTABLE) {
status = aer->cor_status;
mask = aer->cor_mask;
+ info.level = KERN_WARNING;
} else {
status = aer->uncor_status;
mask = aer->uncor_mask;
+ info.level = KERN_ERR;
tlp_header_valid = status & AER_LOG_TLP_MASKS;
}

@@ -1297,6 +1294,7 @@ static void aer_isr_one_error(struct aer_rpc *rpc,
struct aer_err_info e_info = {
.id = ERR_COR_ID(e_src->id),
.severity = AER_CORRECTABLE,
+ .level = KERN_WARNING,
.multi_error_valid = multi ? 1 : 0,
};

@@ -1312,6 +1310,7 @@ static void aer_isr_one_error(struct aer_rpc *rpc,
struct aer_err_info e_info = {
.id = ERR_UNCOR_ID(e_src->id),
.severity = fatal ? AER_FATAL : AER_NONFATAL,
+ .level = KERN_ERR,
.multi_error_valid = multi ? 1 : 0,
};

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 315bf2bfd570..34af0ea45c0d 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -252,6 +252,7 @@ static int dpc_get_aer_uncorrect_severity(struct pci_dev *dev,
else
info->severity = AER_NONFATAL;

+ info->level = KERN_WARNING;
return 1;
}

--
2.43.0