When a PCIe AER occurs, the TLP header information is
printed in the kernel message but it is missing from
the tracepoint. A userspace program can use this information
in the tracepoint to better analyze problems.
To enable the tracepoint:
echo 1 > /sys/kernel/debug/tracing/events/ras/aer_event/enable
Example tracepoint output:
cat /sys/kernel/debug/tracing/trace
aer_event: 0000:01:00.0
PCIe Bus Error: severity=Uncorrected, non-fatal, Completer Abort
TLP Header={0x0,0x1,0x2,0x3}
Signed-off-by: Thomas Tai <thomas.tai@xxxxxxxxxx>
---
drivers/pci/pcie/aer/aerdrv_errprint.c | 4 ++--
include/ras/ras_event.h | 22 ++++++++++++++++++----
2 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/pcie/aer/aerdrv_errprint.c b/drivers/pci/pcie/aer/aerdrv_errprint.c
index cfc89dd..fd49a8d 100644
--- a/drivers/pci/pcie/aer/aerdrv_errprint.c
+++ b/drivers/pci/pcie/aer/aerdrv_errprint.c
@@ -189,7 +189,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
pci_err(dev, " Error of this Agent(%04x) is reported first\n", id);
trace_aer_event(dev_name(&dev->dev), (info->status & ~info->mask),
- info->severity);
+ info->severity, info->tlp_header_valid, &info->tlp);
}
void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info)
@@ -249,6 +249,6 @@ void cper_print_aer(struct pci_dev *dev, int aer_severity,
__print_tlp_header(dev, &aer->header_log);
trace_aer_event(dev_name(&dev->dev), (status & ~mask),
- aer_severity);
+ aer_severity, tlp_header_valid, &aer->header_log);
}
#endif
diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 9c68986..a079463 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -298,30 +298,44 @@
TRACE_EVENT(aer_event,
TP_PROTO(const char *dev_name,
const u32 status,
- const u8 severity),
+ const u8 severity,
+ const u8 tlp_header_valid,
+ struct aer_header_log_regs *tlp),
- TP_ARGS(dev_name, status, severity),
+ TP_ARGS(dev_name, status, severity, tlp_header_valid, tlp),
TP_STRUCT__entry(
__string( dev_name, dev_name )
__field( u32, status )
__field( u8, severity )
+ __field( u8, tlp_header_valid)
+ __array( u32, tlp_header, 4 )
),
TP_fast_assign(
__assign_str(dev_name, dev_name);
__entry->status = status;
__entry->severity = severity;
+ __entry->tlp_header_valid = tlp_header_valid;
+ if (tlp_header_valid) {
+ __entry->tlp_header[0] = tlp->dw0;
+ __entry->tlp_header[1] = tlp->dw1;
+ __entry->tlp_header[2] = tlp->dw2;
+ __entry->tlp_header[3] = tlp->dw3;
+ }
),
- TP_printk("%s PCIe Bus Error: severity=%s, %s\n",
+ TP_printk("%s PCIe Bus Error: severity=%s, %s, TLP Header=%s\n",
__get_str(dev_name),
__entry->severity == AER_CORRECTABLE ? "Corrected" :
__entry->severity == AER_FATAL ?
"Fatal" : "Uncorrected, non-fatal",
__entry->severity == AER_CORRECTABLE ?
__print_flags(__entry->status, "|", aer_correctable_errors) :
- __print_flags(__entry->status, "|", aer_uncorrectable_errors))
+ __print_flags(__entry->status, "|", aer_uncorrectable_errors),
+ __entry->tlp_header_valid ?
+ __print_array(__entry->tlp_header, 4, 4) :
+ "Not available")
);
/*
--
1.8.3.1
