From: Leo Yan <leo.yan@linaro.org>
To: Jonathan Corbet <corbet@lwn.net>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Wei Xu <xuwei5@hisilicon.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Andy Gross <andy.gross@linaro.org>,
David Brown <david.brown@linaro.org>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Guodong Xu <guodong.xu@linaro.org>,
John Stultz <john.stultz@linaro.org>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
linux-clk@vger.kernel.org, mike.leach@linaro.org,
Suzuki.Poulose@arm.com, sudeep.holla@arm.com
Cc: Leo Yan <leo.yan@linaro.org>
Subject: [PATCH v5 2/9] doc: Add documentation for Coresight CPU debug
Date: Sun, 26 Mar 2017 02:23:10 +0800 [thread overview]
Message-ID: <1490466197-29163-3-git-send-email-leo.yan@linaro.org> (raw)
In-Reply-To: <1490466197-29163-1-git-send-email-leo.yan@linaro.org>
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
next prev parent reply other threads:[~2017-03-25 18:23 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-25 18:23 [PATCH v5 0/9] coresight: enable debug module Leo Yan
2017-03-25 18:23 ` [PATCH v5 1/9] coresight: bindings for CPU " Leo Yan
2017-03-30 22:49 ` Rob Herring
2017-03-31 9:04 ` Suzuki K Poulose
2017-03-25 18:23 ` Leo Yan [this message]
2017-03-25 18:23 ` [PATCH v5 3/9] coresight: of_get_coresight_platform_data: Add missing of_node_put Leo Yan
2017-03-25 18:23 ` [PATCH v5 4/9] coresight: refactor with function of_coresight_get_cpu Leo Yan
2017-03-31 9:05 ` Suzuki K Poulose
[not found] ` <1490466197-29163-1-git-send-email-leo.yan-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-03-25 18:23 ` [PATCH v5 5/9] coresight: use const for device_node structures Leo Yan
[not found] ` <1490466197-29163-6-git-send-email-leo.yan-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-04-04 21:48 ` Stephen Boyd
2017-03-25 18:23 ` [PATCH v5 9/9] arm64: dts: qcom: msm8916: Add debug unit Leo Yan
2017-03-25 18:23 ` [PATCH v5 6/9] coresight: add support for CPU debug module Leo Yan
2017-03-27 16:34 ` Suzuki K Poulose
2017-03-29 3:07 ` Leo Yan
2017-03-29 9:07 ` Suzuki K Poulose
2017-03-29 10:27 ` Leo Yan
2017-03-29 10:31 ` Suzuki K Poulose
[not found] ` <89b6c6c7-0da0-6891-312a-c9221851c20a-5wv7dgnIgG8@public.gmane.org>
2017-03-29 10:37 ` Leo Yan
2017-03-29 15:50 ` Suzuki K Poulose
2017-03-29 15:17 ` Mike Leach
2017-03-30 1:18 ` Leo Yan
2017-03-29 15:41 ` Mathieu Poirier
2017-03-28 16:50 ` Mathieu Poirier
2017-03-29 1:54 ` Leo Yan
2017-03-29 14:56 ` Mike Leach
2017-03-30 1:03 ` Leo Yan
2017-03-30 9:00 ` Suzuki K Poulose
2017-03-30 13:51 ` Leo Yan
2017-03-30 15:47 ` Sudeep Holla
2017-03-29 16:55 ` Mathieu Poirier
[not found] ` <20170329165535.GB24889-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-03-30 1:59 ` Leo Yan
2017-03-30 15:46 ` Mathieu Poirier
[not found] ` <CANLsYkwPYSvy2xjf8uuvx1WGWpGdMFy7kF=30VbvgW+jDvnFuw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-03-30 16:04 ` Sudeep Holla
[not found] ` <1490466197-29163-7-git-send-email-leo.yan-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-03-30 15:56 ` Sudeep Holla
2017-03-31 0:54 ` Leo Yan
2017-03-25 18:23 ` [PATCH v5 7/9] clk: hi6220: add debug APB clock Leo Yan
2017-04-04 21:51 ` Stephen Boyd
[not found] ` <20170404215109.GH18246-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-04-06 13:59 ` Leo Yan
2017-03-25 18:23 ` [PATCH v5 8/9] arm64: dts: hi6220: register debug module Leo Yan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1490466197-29163-3-git-send-email-leo.yan@linaro.org \
--to=leo.yan@linaro.org \
--cc=Suzuki.Poulose@arm.com \
--cc=andy.gross@linaro.org \
--cc=catalin.marinas@arm.com \
--cc=corbet@lwn.net \
--cc=david.brown@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=guodong.xu@linaro.org \
--cc=john.stultz@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-clk@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-soc@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mathieu.poirier@linaro.org \
--cc=mike.leach@linaro.org \
--cc=mturquette@baylibre.com \
--cc=robh+dt@kernel.org \
--cc=sboyd@codeaurora.org \
--cc=sudeep.holla@arm.com \
--cc=will.deacon@arm.com \
--cc=xuwei5@hisilicon.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).