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| author | Scott Cheloha <cheloha@linux.ibm.com> | 2022-07-13 15:23:35 -0500 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-07-20 21:57:39 +1000 |
| commit | 69472ffa6575e3a1c1e3324dd06395af0f63eb71 (patch) | |
| tree | ad9ac36e9bd06824f3d74575655b7b25430140b3 /Documentation/watchdog | |
| parent | 578030bfe117060bf86c81aaa7b3faead4589810 (diff) | |
| download | lwn-69472ffa6575e3a1c1e3324dd06395af0f63eb71.tar.gz lwn-69472ffa6575e3a1c1e3324dd06395af0f63eb71.zip | |
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 <cheloha@linux.ibm.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220713202335.1217647-5-cheloha@linux.ibm.com
Diffstat (limited to 'Documentation/watchdog')
| -rw-r--r-- | Documentation/watchdog/watchdog-parameters.rst | 12 |
1 files changed, 12 insertions, 0 deletions
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) |