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 detected. Changes since v2: - Add documentation Changes since v1: - Remove the magic value that indicated an SBE/SBEFIFO error with no FFDC. - 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 -- 2.27.0
