From 69472ffa6575e3a1c1e3324dd06395af0f63eb71 Mon Sep 17 00:00:00 2001 From: Scott Cheloha Date: Wed, 13 Jul 2022 15:23:35 -0500 Subject: watchdog/pseries-wdt: initial support for H_WATCHDOG-based watchdog timers PAPR v2.12 defines a new hypercall, H_WATCHDOG. The hypercall permits guest control of one or more virtual watchdog timers. The timers have millisecond granularity. The guest is terminated when a timer expires. This patch adds a watchdog driver for these timers, "pseries-wdt". pseries_wdt_probe() currently assumes the existence of only one platform device and always assigns it watchdogNumber 1. If we ever expose more than one timer to userspace we will need to devise a way to assign a distinct watchdogNumber to each platform device at device registration time. Signed-off-by: Scott Cheloha Acked-by: Guenter Roeck Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220713202335.1217647-5-cheloha@linux.ibm.com --- Documentation/watchdog/watchdog-parameters.rst | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'Documentation/watchdog') diff --git a/Documentation/watchdog/watchdog-parameters.rst b/Documentation/watchdog/watchdog-parameters.rst index 223c99361a30..29153eed6689 100644 --- a/Documentation/watchdog/watchdog-parameters.rst +++ b/Documentation/watchdog/watchdog-parameters.rst @@ -425,6 +425,18 @@ pnx833x_wdt: ------------------------------------------------- +pseries-wdt: + action: + Action taken when watchdog expires: 0 (power off), 1 (restart), + 2 (dump and restart). (default=1) + timeout: + Initial watchdog timeout in seconds. (default=60) + nowayout: + Watchdog cannot be stopped once started. + (default=kernel config parameter) + +------------------------------------------------- + rc32434_wdt: timeout: Watchdog timeout value, in seconds (default=20) -- cgit v1.2.1