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-Last reviewed: 08/20/2018
-
-                     HPE iLO NMI Watchdog Driver
-                   for iLO based ProLiant Servers
-
- The HPE iLO NMI Watchdog driver is a kernel module that provides basic
- watchdog functionality and handler for the iLO "Generate NMI to System"
- virtual button.
-
- All references to iLO in this document imply it also works on iLO2 and all
- subsequent generations.
-
- Watchdog functionality is enabled like any other common watchdog driver. That
- is, an application needs to be started that kicks off the watchdog timer. A
- basic application exists in tools/testing/selftests/watchdog/ named
- watchdog-test.c. Simply compile the C file and kick it off. If the system
- gets into a bad state and hangs, the HPE ProLiant iLO timer register will
- not be updated in a timely fashion and a hardware system reset (also known as
- an Automatic Server Recovery (ASR)) event will occur.
-
- The hpwdt driver also has the following module parameters:
-
- soft_margin - allows the user to set the watchdog timer value.
-               Default value is 30 seconds.
- timeout     - an alias of soft_margin.
- pretimeout  - allows the user to set the watchdog pretimeout value.
-               This is the number of seconds before timeout when an
-               NMI is delivered to the system. Setting the value to
-               zero disables the pretimeout NMI.
-               Default value is 9 seconds.
- nowayout    - basic watchdog parameter that does not allow the timer to
-               be restarted or an impending ASR to be escaped.
-               Default value is set when compiling the kernel. If it is set
-               to "Y", then there is no way of disabling the watchdog once
-               it has been started.
-
- NOTE: More information about watchdog drivers in general, including the ioctl
-       interface to /dev/watchdog can be found in
-       Documentation/watchdog/watchdog-api.txt and Documentation/IPMI.txt.
-
- Due to limitations in the iLO hardware, the NMI pretimeout if enabled,
- can only be set to 9 seconds.  Attempts to set pretimeout to other
- non-zero values will be rounded, possibly to zero.  Users should verify
- the pretimeout value after attempting to set pretimeout or timeout.
-
- Upon receipt of an NMI from the iLO, the hpwdt driver will initiate a
- panic. This is to allow for a crash dump to be collected.  It is incumbent
- upon the user to have properly configured the system for kdump.
-
- The default Linux kernel behavior upon panic is to print a kernel tombstone
- and loop forever.  This is generally not what a watchdog user wants.
-
- For those wishing to learn more please see:
-	Documentation/kdump/kdump.txt
-	Documentation/admin-guide/kernel-parameters.txt (panic=)
-	Your Linux Distribution specific documentation.
-
- If the hpwdt does not receive the NMI associated with an expiring timer,
- the iLO will proceed to reset the system at timeout if the timer hasn't
- been updated.
-
---
-
- The HPE iLO NMI Watchdog Driver and documentation were originally developed
- by Tom Mingarelli.
-