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    Subject[PATCH v5 2/9] doc: Add documentation for Coresight CPU debug
    Date
    Update kernel-parameters.txt to add two new parameters:

    - coresight_cpu_debug.enable is a knob to enable debugging at boot time.
    - coresight_cpu_debug.idle_constraint is used to constrain idle states
    to ensure Coresight CPU debug component can be accessible.

    Signed-off-by: Leo Yan <leo.yan@linaro.org>
    ---
    Documentation/admin-guide/kernel-parameters.txt | 21 +++++++++++++++++++++
    1 file changed, 21 insertions(+)

    diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
    index 2ba45ca..6ed57d9 100644
    --- a/Documentation/admin-guide/kernel-parameters.txt
    +++ b/Documentation/admin-guide/kernel-parameters.txt
    @@ -650,6 +650,27 @@
    /proc/<pid>/coredump_filter.
    See also Documentation/filesystems/proc.txt.

    + coresight_cpu_debug.enable
    + [ARM,ARM64]
    + Format: <bool>
    + Enable/disable the CPU sampling based debugging.
    + 0: default value, disable debugging
    + 1: enable debugging at boot time
    +
    + coresight_cpu_debug.idle_constraint
    + [ARM,ARM64]
    + Format: <int>
    + Some platforms have designed the idle states to disable
    + CPU power domain and need manually set constraint so
    + can access coresight CPU debug component safely. Setting
    + this parameter for latency requirement in
    + microseconds, finally we can constraint all or partial
    + idle states to ensure the CPU power domain is enabled.
    + Default is -1, which means no limiation to CPU idle
    + states; if set to 0, this means disabling all idle
    + states; user can choose other platform dependent values
    + so can disable specific idle states for the platform.
    +
    cpuidle.off=1 [CPU_IDLE]
    disable the cpuidle sub-system

    --
    2.7.4
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