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PCI/AER: Add sysfs attributes to provide AER stats and breakdown

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Add sysfs attributes to provide total and breakdown of the AERs seen,
into different type of correctable, fatal and nonfatal errors:

  /sys/bus/pci/devices/<dev>/aer_dev_correctable
  /sys/bus/pci/devices/<dev>/aer_dev_fatal
  /sys/bus/pci/devices/<dev>/aer_dev_nonfatal

Signed-off-by: Rajat Jain <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
This commit is contained in:
Rajat Jain 2018-06-21 16:48:28 -07:00 • committed by Bjorn Helgaas
commit 81aa5206f9
5 changed files with 197 additions and 0 deletions
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94
Documentation/ABI/testing/sysfs-bus-pci-devices-aer_stats Normal file
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==========================
PCIe Device AER statistics
==========================
These attributes show up under all the devices that are AER capable. These
statistical counters indicate the errors "as seen/reported by the device".
Note that this may mean that if an endpoint is causing problems, the AER
counters may increment at its link partner (e.g. root port) because the
errors may be "seen" / reported by the link partner and not the
problematic endpoint itself (which may report all counters as 0 as it never
saw any problems).
Where: /sys/bus/pci/devices/<dev>/aer_dev_correctable
Date: July 2018
Kernel Version: 4.19.0
Contact: [email protected], [email protected]
Description: List of correctable errors seen and reported by this
PCI device using ERR_COR. Note that since multiple errors may
be reported using a single ERR_COR message, thus
TOTAL_ERR_COR at the end of the file may not match the actual
total of all the errors in the file. Sample output:
-------------------------------------------------------------------------
localhost /sys/devices/pci0000:00/0000:00:1c.0 # cat aer_dev_correctable
Receiver Error 2
Bad TLP 0
Bad DLLP 0
RELAY_NUM Rollover 0
Replay Timer Timeout 0
Advisory Non-Fatal 0
Corrected Internal Error 0
Header Log Overflow 0
TOTAL_ERR_COR 2
-------------------------------------------------------------------------
Where: /sys/bus/pci/devices/<dev>/aer_dev_fatal
Date: July 2018
Kernel Version: 4.19.0
Contact: [email protected], [email protected]
Description: List of uncorrectable fatal errors seen and reported by this
PCI device using ERR_FATAL. Note that since multiple errors may
be reported using a single ERR_FATAL message, thus
TOTAL_ERR_FATAL at the end of the file may not match the actual
total of all the errors in the file. Sample output:
-------------------------------------------------------------------------
localhost /sys/devices/pci0000:00/0000:00:1c.0 # cat aer_dev_fatal
Undefined 0
Data Link Protocol 0
Surprise Down Error 0
Poisoned TLP 0
Flow Control Protocol 0
Completion Timeout 0
Completer Abort 0
Unexpected Completion 0
Receiver Overflow 0
Malformed TLP 0
ECRC 0
Unsupported Request 0
ACS Violation 0
Uncorrectable Internal Error 0
MC Blocked TLP 0
AtomicOp Egress Blocked 0
TLP Prefix Blocked Error 0
TOTAL_ERR_FATAL 0
-------------------------------------------------------------------------
Where: /sys/bus/pci/devices/<dev>/aer_dev_nonfatal
Date: July 2018
Kernel Version: 4.19.0
Contact: [email protected], [email protected]
Description: List of uncorrectable nonfatal errors seen and reported by this
PCI device using ERR_NONFATAL. Note that since multiple errors
may be reported using a single ERR_FATAL message, thus
TOTAL_ERR_NONFATAL at the end of the file may not match the
actual total of all the errors in the file. Sample output:
-------------------------------------------------------------------------
localhost /sys/devices/pci0000:00/0000:00:1c.0 # cat aer_dev_nonfatal
Undefined 0
Data Link Protocol 0
Surprise Down Error 0
Poisoned TLP 0
Flow Control Protocol 0
Completion Timeout 0
Completer Abort 0
Unexpected Completion 0
Receiver Overflow 0
Malformed TLP 0
ECRC 0
Unsupported Request 0
ACS Violation 0
Uncorrectable Internal Error 0
MC Blocked TLP 0
AtomicOp Egress Blocked 0
TLP Prefix Blocked Error 0
TOTAL_ERR_NONFATAL 0
-------------------------------------------------------------------------