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authorJean-Yves Faye <jean-yves.faye@c-s.fr>2015-09-29 11:39:19 +0200
committerCorey Minyard <cminyard@mvista.com>2015-11-16 06:28:43 -0600
commitc7f42c63901b964833eb23a9bda873b799e7f308 (patch)
tree6ceaa67dae7e317c83c2b4434c9c75bc68d1e55f /Documentation
parent66f44018300c5e6f53c9d30d6920332cf0e6a8f9 (diff)
downloadlinux-c7f42c63901b964833eb23a9bda873b799e7f308.tar.bz2
ipmi watchdog : add panic_wdt_timeout parameter
In order to allow panic actions to be processed, the ipmi watchdog driver sets a new timeout value on panic. The 255s timeout was designed to allow kdump and others actions on panic, as in http://lkml.iu.edu/hypermail/linux/kernel/0711.3/0258.html This is counter-intuitive for a end-user who sets watchdog timeout value to something like 30s and who expects BMC to reset the system within 30s of a panic. This commit allows user to configure the timeout on panic. Signed-off-by: Jean-Yves Faye <jean-yves.faye@c-s.fr> Signed-off-by: Corey Minyard <cminyard@mvista.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/IPMI.txt7
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/IPMI.txt b/Documentation/IPMI.txt
index 31d1d658827f..c0d8788e75d3 100644
--- a/Documentation/IPMI.txt
+++ b/Documentation/IPMI.txt
@@ -587,7 +587,7 @@ used to control it:
modprobe ipmi_watchdog timeout=<t> pretimeout=<t> action=<action type>
preaction=<preaction type> preop=<preop type> start_now=x
- nowayout=x ifnum_to_use=n
+ nowayout=x ifnum_to_use=n panic_wdt_timeout=<t>
ifnum_to_use specifies which interface the watchdog timer should use.
The default is -1, which means to pick the first one registered.
@@ -597,7 +597,9 @@ is the amount of seconds before the reset that the pre-timeout panic will
occur (if pretimeout is zero, then pretimeout will not be enabled). Note
that the pretimeout is the time before the final timeout. So if the
timeout is 50 seconds and the pretimeout is 10 seconds, then the pretimeout
-will occur in 40 second (10 seconds before the timeout).
+will occur in 40 second (10 seconds before the timeout). The panic_wdt_timeout
+is the value of timeout which is set on kernel panic, in order to let actions
+such as kdump to occur during panic.
The action may be "reset", "power_cycle", or "power_off", and
specifies what to do when the timer times out, and defaults to
@@ -634,6 +636,7 @@ for configuring the watchdog:
ipmi_watchdog.preop=<preop type>
ipmi_watchdog.start_now=x
ipmi_watchdog.nowayout=x
+ ipmi_watchdog.panic_wdt_timeout=<t>
The options are the same as the module parameter options.