[PATCH v5 2/9] doc: Add documentation for Coresight CPU debug
From: Leo Yan <hidden>
Date: 2017-03-25 18:24:52
Also in:
linux-arm-msm, linux-clk, linux-devicetree, lkml
Subsystem:
documentation, the rest · Maintainers:
Jonathan Corbet, Linus Torvalds
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 <redacted> --- 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
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2.7.4