diff options
| author | Keerthy <j-keerthy@ti.com> | 2017-04-18 09:59:59 +0530 |
|---|---|---|
| committer | Zhang Rui <rui.zhang@intel.com> | 2017-05-05 16:01:45 +0800 |
| commit | ef1d87e06ab4d3f9a95f02517ecc50902dc233a7 (patch) | |
| tree | 6dd3327394c0cb14fa964a3a8baf1c51b6d0e337 /drivers/thermal/Kconfig | |
| parent | e441fd68663e298e99a99e215e0144a0eda6250d (diff) | |
| download | linux-ef1d87e06ab4d3f9a95f02517ecc50902dc233a7.tar.bz2 | |
thermal: core: Add a back up thermal shutdown mechanism
orderly_poweroff is triggered when a graceful shutdown
of system is desired. This may be used in many critical states of the
kernel such as when subsystems detects conditions such as critical
temperature conditions. However, in certain conditions in system
boot up sequences like those in the middle of driver probes being
initiated, userspace will be unable to power off the system in a clean
manner and leaves the system in a critical state. In cases like these,
the /sbin/poweroff will return success (having forked off to attempt
powering off the system. However, the system overall will fail to
completely poweroff (since other modules will be probed) and the system
is still functional with no userspace (since that would have shut itself
off).
However, there is no clean way of detecting such failure of userspace
powering off the system. In such scenarios, it is necessary for a backup
workqueue to be able to force a shutdown of the system when orderly
shutdown is not successful after a configurable time period.
Reported-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal/Kconfig')
| -rw-r--r-- | drivers/thermal/Kconfig | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 776b34396144..74ef51dfb816 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -15,6 +15,23 @@ menuconfig THERMAL if THERMAL +config THERMAL_EMERGENCY_POWEROFF_DELAY_MS + int "Emergency poweroff delay in milli-seconds" + depends on THERMAL + default 0 + help + Thermal subsystem will issue a graceful shutdown when + critical temperatures are reached using orderly_poweroff(). In + case of failure of an orderly_poweroff(), the thermal emergency + poweroff kicks in after a delay has elapsed and shuts down the system. + This config is number of milliseconds to delay before emergency + poweroff kicks in. Similarly to the critical trip point, + the delay should be carefully profiled so as to give adequate + time for orderly_poweroff() to finish on regular execution. + If set to 0 emergency poweroff will not be supported. + + In doubt, leave as 0. + config THERMAL_HWMON bool prompt "Expose thermal sensors as hwmon device" |