Linux-Watchdog Archive on lore.kernel.org
 help / color / Atom feed
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: 14+ 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
2020-12-01 22:54     ` Corey Minyard
2020-12-01 23:43       ` Guenter Roeck
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200620173351.18752-1-minyard@acm.org \
    --to=minyard@acm.org \
    --cc=gabriele.paoloni@intel.com \
    --cc=linux-watchdog@vger.kernel.org \
    --cc=linux@roeck-us.net \
    --cc=wim@linux-watchdog.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Watchdog Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-watchdog/0 linux-watchdog/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-watchdog linux-watchdog/ https://lore.kernel.org/linux-watchdog \
		linux-watchdog@vger.kernel.org
	public-inbox-index linux-watchdog

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-watchdog


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git