# Debug using ftrace method

Thermal logging helps to understand the active configurations of the
thermal zones and the existing thermal mitigation levels. To retrieve
thermal configuration and active mitigation levels, use ftrace logs.

## ftrace method

To enable thermal ftace logs run the following commands:

echo 1 > /sys/kernel/tracing/events/thermal/enable
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Tab QCS6490/QCS5430
Tab QCS9075

The following are the log snippets of different thermal events:

/* In the following snippet, "cpu0-thermal" represents thermal zone and “temp” indicates existing temperature of thermal zone */
    sh-1420    [001] ..... 1132975.934216: thermal_temperature: thermal_zone=cpu0-thermal id=13 temp_prev=47700 temp=110000
    /*In the following snippet, “trip” indicates trip level and trip level 1 is triggered for cpu0-thermal thermal zone*/
    sh-1420    [001] ..... 1132975.934449: thermal_zone_trip: thermal_zone=cpu0-thermal id=13 trip=1 trip_type=PASSIVE
    /*In the following snippet, “type” represents the cooling device and "target" represents active mitigation of the cooling device*/
    sh-1420 [001] ..... 1132975.934473: cdev_update: type=idle-cpu0 target=100
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The following are the log snippets of mitigation trigger and clear thermal events for QCS9075:

/* In the following snippet, " cpu-1-2-1-thermal" represents thermal zone
    and “trip” indicates trip level and trip level 1 is triggered for
    cpu-1-2-1-thermal thermal zone*/
    irq/222-c252000-115     [000] ..... 250901.340001:
    thermal_zone_trip: thermal_zone=cpu-1-2-1-thermal
    id=16 trip=1 trip_type=PASSIVE
    /*In the following snippet, “type” represents the cooling device and "target" represents active mitigation of the cooling device*/
    irq/222-c252000-115     [000] ..... 250901.340009: cdev_update: type=idle-cpu6 target=100 kworker/u17:0-23271   [000] ..... 250901.355101:
    thermal_temperature: thermal_zone=cpu-1-2-1-thermal id=16 temp_prev=30100 temp=34100
    kworker/u17:0-23271   [000] ..... 250901.339084: thermal_temperature: thermal_zone=cpu-1-2-1-thermal id=16 temp_prev=30100 temp=29800
    kworker/u17:0-23271   [000] ..... 250901.339139: cdev_update: type=idle-cpu6 target=0
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Note

The log snippet for QCS8275 will be updated in a future release.

Last Published: Apr 10, 2025

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