[PATCH v3 0/4] occ: fsi and hwmon: Extract and provide the SBEFIFO FFDC

Eddie James eajames at linux.ibm.com
Tue Sep 28 01:59:21 AEST 2021

Currently, users have no way to obtain the FFDC (First Failure Data
Capture) provided by the SBEFIFO when an operation fails. To remedy this,
add code in the FSI OCC driver to store this FFDC in the user's response
buffer and set the response length accordingly.
On the hwmon side, there is a need at the application level to perform
side-band operations in response to SBE errors. Therefore, add a new
binary sysfs file that provides the FFDC (or lack thereof) when there is
an SBEFIFO error. Now applications can take action when an SBE error is

Changes since v2:
 - Add documentation

Changes since v1:
 - Remove the magic value that indicated an SBE/SBEFIFO error with no
 - Remove binary sysfs state management and intead just clear the error
   flag when the whole FFDC has been read.

Eddie James (4):
  fsi: occ: Use a large buffer for responses
  fsi: occ: Store the SBEFIFO FFDC in the user response buffer
  docs: ABI: testing: Document the OCC hwmon FFDC binary interface
  hwmon: (occ) Provide the SBEFIFO FFDC in binary sysfs

 .../sysfs-bus-platform-devices-occ-hwmon      |  13 ++
 drivers/fsi/fsi-occ.c                         | 163 +++++++++---------
 drivers/hwmon/occ/p9_sbe.c                    |  86 ++++++++-
 include/linux/fsi-occ.h                       |   2 +
 4 files changed, 184 insertions(+), 80 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-platform-devices-occ-hwmon


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