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[PATCH] ipmi: add power cycle capability

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This patch to adds "power cycle" functionality to the IPMI power off module
ipmi_poweroff.  It also contains changes to support procfs control of the
feature.

The power cycle action is considered an optional chassis control in the IPMI
specification.  However, it is definitely useful when the hardware supports
it.  A power cycle is usually required in order to reset a firmware in a bad
state.  This action is critical to allow remote management of servers.

The implementation adds power cycle as optional to the ipmi_poweroff module.
It can be modified dynamically through the proc entry mentioned above.  During
a power down and enabled, the power cycle command is sent to the BMC firmware.
 If it fails either due to non-support or some error, it will retry to send
the command as power off.

Signed-off-by: Christopher A. Poblete <Chris_Poblete@dell.com>
Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Corey Minyard
2005-06-23 22:01:42 -07:00
committed by Linus Torvalds
parent 8f43f84f13
commit 3b6259432d
4 changed files with 157 additions and 13 deletions
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20
Documentation/IPMI.txt
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@@ -594,3 +594,23 @@ an event generator, the event receiver from the local management
controller will be queried and the events sent to the SEL on that
device. Otherwise, the events go nowhere since there is nowhere to
send them.
Poweroff
--------
If the poweroff capability is selected, the IPMI driver will install
a shutdown function into the standard poweroff function pointer. This
is in the ipmi_poweroff module. When the system requests a powerdown,
it will send the proper IPMI commands to do this. This is supported on
several platforms.
There is a module parameter named "poweroff_control" that may either be zero
(do a power down) or 2 (do a power cycle, power the system off, then power
it on in a few seconds). Setting ipmi_poweroff.poweroff_control=x will do
the same thing on the kernel command line. The parameter is also available
via the proc filesystem in /proc/ipmi/poweroff_control. Note that if the
system does not support power cycling, it will always to the power off.
Note that if you have ACPI enabled, the system will prefer using ACPI to
power off.