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IPMI: new NMI handling

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Convert over to the new NMI handling for getting IPMI watchdog timeouts via an
NMI.  This add config options to know if there is the ability to receive NMIs
and if it has an NMI post processing call.  Then it modifies the IPMI watchdog
to take advantage of this so that it can know if an NMI comes in.

It also adds testing that the IPMI NMI watchdog works.

Signed-off-by: Corey Minyard <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Corey Minyard 2007-10-18 03:07:10 -07:00 • committed by Linus Torvalds
commit 612b5a8d3a
2 changed files with 110 additions and 44 deletions
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8
Documentation/IPMI.txt
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@ -584,9 +584,11 @@ The watchdog will panic and start a 120 second reset timeout if it
gets a pre-action. During a panic or a reboot, the watchdog will
start a 120 timer if it is running to make sure the reboot occurs.
Note that if you use the NMI preaction for the watchdog, you MUST
NOT use nmi watchdog mode 1. If you use the NMI watchdog, you
must use mode 2.
Note that if you use the NMI preaction for the watchdog, you MUST NOT
use the nmi watchdog. There is no reasonable way to tell if an NMI
comes from the IPMI controller, so it must assume that if it gets an
otherwise unhandled NMI, it must be from IPMI and it will panic
immediately.
Once you open the watchdog timer, you must write a 'V' character to the
device to close it, or the timer will not stop. This is a new semantic