linux-kernel - [PATCH v3 3/4] docs: ABI: testing: Document the OCC hwmon FFDC binary interface

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Message-Id: <20210927155925.15485-4-eajames@linux.ibm.com>
Date:   Mon, 27 Sep 2021 10:59:24 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     linux-fsi@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        jk@...abs.org, joel@....id.au, alistair@...ple.id.au,
        linux@...ck-us.net, jdelvare@...e.com,
        Eddie James <eajames@...ux.ibm.com>
Subject: [PATCH v3 3/4] docs: ABI: testing: Document the OCC hwmon FFDC binary interface

Add documentation for the new binary sysfs that will dump the SBEFIFO
FFDC.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
 .../testing/sysfs-bus-platform-devices-occ-hwmon    | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-platform-devices-occ-hwmon

diff --git a/Documentation/ABI/testing/sysfs-bus-platform-devices-occ-hwmon b/Documentation/ABI/testing/sysfs-bus-platform-devices-occ-hwmon
new file mode 100644
index 000000000000..b24d7ab0278f
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-platform-devices-occ-hwmon
@@ -0,0 +1,13 @@
+What:		/sys/bus/platform/devices/occ-hwmon.X/ffdc
+KernelVersion:	5.15
+Contact:	eajames@...ux.ibm.com
+Description:
+		Contains the First Failure Data Capture from the SBEFIFO
+		hardware, if there is any from a previous transfer. Otherwise,
+		the file is empty. The data is cleared when it's been
+		completely read by a user. As the name suggests, only the data
+		from the first error is saved, until it's cleared upon read. The OCC hwmon driver, running on
+		a Baseboard Management Controller (BMC), communicates with
+		POWER9 and up processors over the Self-Boot Engine (SBE) FIFO.
+		In many error conditions, the SBEFIFO will return error data
+		indicating the type of error and system state, etc.
-- 
2.27.0