55 lines
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
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* Qualcomm MSM Core Hang Detection
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Core Hang Detection provides the three sysfs entries for configuring
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threshold, PMU event mux select and to enable hang detection.
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If core is hung for threshold time (value X 10ns) and no
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heart beat event from pmu to core hang monitor detection, core hang
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interrupt would be generated to reset the SOC via secure watchdog
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to collect all cores context.
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PMU event mux select can be programmed to one of the supported
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events, for example-
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1) Load Instruction executed,
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2) Store Instructions executed
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3) Instruction architecturally executed and etc.
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Writing 1 into enable sysfs entry, enables core hang detection and
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if there is no selected PMU mux event for 10ns core hang counter
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gets incremented. Once counter reaches the programmed threshold value,
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core hang interrupts generated to reset the SOC.
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The device tree parameters for the core hang detection are:
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Required properties:
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- compatible : "qcom,core-hang-detect"
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- qcom,threshold-arr :
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Array of APCS_ALIAS*_CORE_HANG_THRESHOLD register address
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for each core.
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- qcom,config-arr :
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Array of APCS_ALIAS*_CORE_HANG_CONFIG register address
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for each core.
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Optional properties:
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Example:
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For msm8937:
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qcom,chd {
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compatible = "qcom,core-hang-detect";
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qcom,threshold-arr = <0xB088094 0xB098094 0xB0A8094
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0xB0B8094 0xB188094 0xB198094 0xB1A8094 0xB1B8094>;
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qcom,config-arr = <0xB08809C 0xB09809C 0xB0A809C
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0xB0B809C 0xB18809C 0xB19809C 0xB1A809C 0xB1B809C>;
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};
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For msmtitanium:
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qcom,chd {
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compatible = "qcom,core-hang-detect";
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qcom,threshold-arr = <0xB1880B0 0xB1980B0 0xB1A80B0
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0xB1B80B0 0xB0880B0 0xB0980B0 0xB0A80B0 0xB0B80B0>;
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qcom,config-arr = <0xB1880B8 0xB1980B8 0xB1A80B8
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0xB1B80B8 0xB0880B8 0xB0980B8 0xB0A80B8 0xB0B80B8>;
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};
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