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From: minyard@acm.org
To: Guenter Roeck <linux@roeck-us.net>,
	Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: linux-watchdog@vger.kernel.org,
	Gabriele Paoloni <gabriele.paoloni@intel.com>
Subject: [PATCH 0/6] watchdog: Add millisecond-level capabilities
Date: Sat, 20 Jun 2020 12:33:45 -0500
Message-ID: <20200620173351.18752-1-minyard@acm.org> (raw)

As mentioned before in the list, this is work for the ELISA (Linux in
safety critical systems) group.  Some use cases require tight watchdog
times so a system can recover quickly on a failure.

This patch series adds millisecond level capabilites that devices can
use if they wish, new ioctls to use those interfaces, new device
attributes with the higher precision, documentation, and it converts the
i6300 and softdog watchdog to use milliseconds.

All existing user APIs should work as before.  The interface between the
watchdog subsystem and the driver is converted to be modal.  If a flag
is set in the options then all interactions are in milliseconds.  If the
flag is not set then they are in seconds.

It's all pretty straightforward except for the calculations in the
i6300 driver, which required some thought.

Note that checkpatch gives warnings about there being no identifiers in
the function arguments in the watchdog ops structure, but I tried to
keep the style the same.

Thanks,

-corey



             reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-20 17:33 minyard [this message]
2020-06-20 17:33 ` [PATCH 1/6] watchdog: Allow a driver to use milliseconds instead of seconds minyard
2020-06-26 23:10   ` Guenter Roeck
2020-06-27  2:18     ` Corey Minyard
2020-06-27  4:08       ` Guenter Roeck
2020-06-28 14:54   ` Guenter Roeck
2020-06-28 17:56     ` Corey Minyard
2020-06-20 17:33 ` [PATCH 2/6] watchdog: Add ioctls for millisecond timeout handling minyard
2020-06-20 17:33 ` [PATCH 3/6] watchdog: Add millisecond precision device attributes minyard
2020-06-20 17:33 ` [PATCH 4/6] watchdog: Add documentation for millisecond interfaces minyard
2020-06-20 17:33 ` [PATCH 5/6] watchdog:i6300: Convert to a millisecond watchdog device minyard
2020-06-20 17:33 ` [PATCH 6/6] watchdog:softdog: Convert to a millisecond watchdog minyard

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