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authorKeerthy <j-keerthy@ti.com>2017-04-18 09:59:59 +0530
committerZhang Rui <rui.zhang@intel.com>2017-05-05 16:01:45 +0800
commitef1d87e06ab4d3f9a95f02517ecc50902dc233a7 (patch)
tree6dd3327394c0cb14fa964a3a8baf1c51b6d0e337 /drivers/thermal/Kconfig
parente441fd68663e298e99a99e215e0144a0eda6250d (diff)
downloadlinux-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/Kconfig17
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"