The change from Wolfram based on Robin's work adds two new watchdog
ioctls WDIOC_GETPRETIMEOUT and WDIOC_SETPRETIMEOUT, both interfaces
are already described in Documentation/watchdog/watchdog-api.txt
Along with UAPI update a new internal interface for watchdog drivers
set_pretimeout() is introduced, it allows to update the state of a controller.
The handling of a pretimeout event is a task delegated to watchdog drivers.
My contribution to the change is negligible, apart of review and testing:
* added visibility of a pretimeout sysfs attribute based on
set WDIOF_PRETIMEOUT watchdog option,
* on WDIOC_SETPRETIMEOUT modify watchdog device pretimeout value in place,
this should save some lines of code on the drivers' side.
Wolfram's patch "watchdog: softdog: implement pretimeout support"
potentially can be added to the series with a minor modification:
- static struct watchdog_device softdog_dev;
.....
- watchdog_notify_pretimeout(&softdog_dev);
+ panic("watchdog pretimeout event");
but I'm hesitating to do it.
The change adds all necessary bits to proceed with a watchdog pretimeout
framework devlopment.
Wolfram Sang (2):
watchdog: add pretimeout support to the core
fs: compat_ioctl: add pretimeout functions for watchdogs
Documentation/watchdog/watchdog-kernel-api.txt | 20 +++++++++
drivers/watchdog/watchdog_dev.c | 57 +++++++++++++++++++++++++-
fs/compat_ioctl.c | 2 +
include/linux/watchdog.h | 11 +++++
4 files changed, 88 insertions(+), 2 deletions(-)
--
2.8.1
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