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watchdog: mei_wdt: implement MEI iAMT watchdog driver

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Create a driver with the generic watchdog interface
for the MEI iAMT watchdog device.

Signed-off-by: Alexander Usyskin <[email protected]>
Signed-off-by: Tomas Winkler <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Tomas Winkler 2016-01-08 00:49:22 +02:00 • committed by Greg Kroah-Hartman
commit 222818c3d8
5 changed files with 427 additions and 6 deletions
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12
Documentation/misc-devices/mei/mei.txt
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@ -231,15 +231,15 @@ IT knows when a platform crashes even when there is a hard failure on the host.
The Intel AMT Watchdog is composed of two parts:
1) Firmware feature - receives the heartbeats
and sends an event when the heartbeats stop.
2) Intel MEI driver - connects to the watchdog feature, configures the
watchdog and sends the heartbeats.
2) Intel MEI iAMT watchdog driver - connects to the watchdog feature,
configures the watchdog and sends the heartbeats.
The Intel MEI driver uses the kernel watchdog API to configure the Intel AMT
Watchdog and to send heartbeats to it. The default timeout of the
The Intel iAMT watchdog MEI driver uses the kernel watchdog API to configure
the Intel AMT Watchdog and to send heartbeats to it. The default timeout of the
watchdog is 120 seconds.
If the Intel AMT Watchdog feature does not exist (i.e. the connection failed),
the Intel MEI driver will disable the sending of heartbeats.
If the Intel AMT is not enabled in the firmware then the watchdog client won't enumerate
on the me client bus and watchdog devices won't be exposed.
Supported Chipsets