[PATCH v2 9/9] cxl: add man page documentation for monitor

[Dave Jiang <dave.jiang@intel.com>]

Add man page documentation to explain the usage of cxl monitor.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 Documentation/cxl/cxl-monitor.txt |   77 +++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 Documentation/cxl/cxl-monitor.txt

diff --git a/Documentation/cxl/cxl-monitor.txt b/Documentation/cxl/cxl-monitor.txt
new file mode 100644
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+// SPDX-License-Identifier: GPL-2.0
+
+cxl-monitor(1)
+================
+
+NAME
+----
+cxl-monitor - Monitor the CXL kernel trace events
+
+SYNOPSIS
+--------
+[verse]
+'cxl monitor' [<options>]
+
+DESCRIPTION
+-----------
+Cxl monitor is used for monitoring the CXL trace events emitted by
+the kernel and convert them to json objects and dumping the json format
+notifications to standard output or a logfile.
+
+Both, the values in configuration file and in options will work. If
+there is a conflict, the values in options will override the values in
+the configuration file. Any updated values in the configuration file will
+take effect only after the monitor process is restarted.
+
+EXAMPLES
+--------
+
+Run a monitor as a daemon to monitor events and output to a log file.
+[verse]
+cxl monitor --daemon --log=/var/log/cxl-monitor.log
+
+Run a monitor as a one-shot command and output the notifications to stdio.
+[verse]
+cxl monitor
+
+Run a monitor daemon as a system service
+[verse]
+systemctl start cxl-monitor.service
+
+OPTIONS
+-------
+-l::
+--log=::
+	Send log messages to the specified destination.
+	- "<file>":
+	  Send log messages to specified <file>. When fopen() is not able
+	  to open <file>, log messages will be forwarded to syslog.
+	- "standard":
+	  Send messages to standard output.
+
+The default log destination is '/var/log/cxl-monitor.log' if "--daemon" is specified,
+otherwise 'standard'. Note that standard and relative path for <file>
+will not work if "--daemon" is specified.
+
+--daemon::
+	Run a monitor as a daemon.
+
+-u::
+--human::
+	Output monitor notification as human friendly json format instead
+	of the default machine friendly json format.
+
+-v::
+--verbose::
+	Emit extra debug messages to log.
+
+COPYRIGHT
+---------
+Copyright (c) 2022, Intel Corp. License GPLv2: GNU GPL version 2
+<http://gnu.org/licenses/gpl.html>. This is free software: you are
+free to change and redistribute it. There is NO WARRANTY, to the
+extent permitted by law.
+
+SEE ALSO
+--------
+linkcxl:cxl-list[1]