perf intel-pt: Add example script for power events and PTWRITE

Add script intel-pt-events.py that provides an example of how to unpack the
raw data for power events and PTWRITE.

Signed-off-by: Adrian Hunter <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/scripts/python/bin/intel-pt-events-record

···
+#!/bin/bash
+
+#
+# print Intel PT Power Events and PTWRITE. The intel_pt PMU event needs
+# to be specified with appropriate config terms.
+#
+if ! echo "$@" | grep -q intel_pt ; then
+	echo "Options must include the Intel PT event e.g. -e intel_pt/pwr_evt,ptw/"
+	echo "and for power events it probably needs to be system wide i.e. -a option"
+	echo "For example: -a -e intel_pt/pwr_evt,branch=0/ sleep 1"
+	exit 1
+fi
+perf record $@

tools/perf/scripts/python/bin/intel-pt-events-report

···
+#!/bin/bash
+# description: print Intel PT Power Events and PTWRITE
+perf script $@ -s "$PERF_EXEC_PATH"/scripts/python/intel-pt-events.py

tools/perf/scripts/python/intel-pt-events.py

···
+# intel-pt-events.py: Print Intel PT Power Events and PTWRITE
+# Copyright (c) 2017, Intel Corporation.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms and conditions of the GNU General Public License,
+# version 2, as published by the Free Software Foundation.
+#
+# This program is distributed in the hope it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+
+import os
+import sys
+import struct
+
+sys.path.append(os.environ['PERF_EXEC_PATH'] + \
+	'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
+
+# These perf imports are not used at present
+#from perf_trace_context import *
+#from Core import *
+
+def trace_begin():
+	print "Intel PT Power Events and PTWRITE"
+
+def trace_end():
+	print "End"
+
+def trace_unhandled(event_name, context, event_fields_dict):
+		print ' '.join(['%s=%s'%(k,str(v))for k,v in sorted(event_fields_dict.items())])
+
+def print_ptwrite(raw_buf):
+	data = struct.unpack_from("<IQ", raw_buf)
+	flags = data[0]
+	payload = data[1]
+	exact_ip = flags & 1
+	print "IP: %u payload: %#x" % (exact_ip, payload),
+
+def print_cbr(raw_buf):
+	data = struct.unpack_from("<BBBBII", raw_buf)
+	cbr = data[0]
+	f = (data[4] + 500) / 1000
+	p = ((cbr * 1000 / data[2]) + 5) / 10
+	print "%3u  freq: %4u MHz  (%3u%%)" % (cbr, f, p),
+
+def print_mwait(raw_buf):
+	data = struct.unpack_from("<IQ", raw_buf)
+	payload = data[1]
+	hints = payload & 0xff
+	extensions = (payload >> 32) & 0x3
+	print "hints: %#x extensions: %#x" % (hints, extensions),
+
+def print_pwre(raw_buf):
+	data = struct.unpack_from("<IQ", raw_buf)
+	payload = data[1]
+	hw = (payload >> 7) & 1
+	cstate = (payload >> 12) & 0xf
+	subcstate = (payload >> 8) & 0xf
+	print "hw: %u cstate: %u sub-cstate: %u" % (hw, cstate, subcstate),
+
+def print_exstop(raw_buf):
+	data = struct.unpack_from("<I", raw_buf)
+	flags = data[0]
+	exact_ip = flags & 1
+	print "IP: %u" % (exact_ip),
+
+def print_pwrx(raw_buf):
+	data = struct.unpack_from("<IQ", raw_buf)
+	payload = data[1]
+	deepest_cstate = payload & 0xf
+	last_cstate = (payload >> 4) & 0xf
+	wake_reason = (payload >> 8) & 0xf
+	print "deepest cstate: %u last cstate: %u wake reason: %#x" % (deepest_cstate, last_cstate, wake_reason),
+
+def print_common_start(comm, sample, name):
+	ts = sample["time"]
+	cpu = sample["cpu"]
+	pid = sample["pid"]
+	tid = sample["tid"]
+	print "%16s %5u/%-5u [%03u] %9u.%09u %7s:" % (comm, pid, tid, cpu, ts / 1000000000, ts %1000000000, name),
+
+def print_common_ip(sample, symbol, dso):
+	ip = sample["ip"]
+	print "%16x %s (%s)" % (ip, symbol, dso)
+
+def process_event(param_dict):
+        event_attr = param_dict["attr"]
+        sample     = param_dict["sample"]
+        raw_buf    = param_dict["raw_buf"]
+        comm       = param_dict["comm"]
+        name       = param_dict["ev_name"]
+
+        # Symbol and dso info are not always resolved
+        if (param_dict.has_key("dso")):
+                dso = param_dict["dso"]
+        else:
+                dso = "[unknown]"
+
+        if (param_dict.has_key("symbol")):
+                symbol = param_dict["symbol"]
+        else:
+                symbol = "[unknown]"
+
+	if name == "ptwrite":
+		print_common_start(comm, sample, name)
+		print_ptwrite(raw_buf)
+		print_common_ip(sample, symbol, dso)
+	elif name == "cbr":
+		print_common_start(comm, sample, name)
+		print_cbr(raw_buf)
+		print_common_ip(sample, symbol, dso)
+	elif name == "mwait":
+		print_common_start(comm, sample, name)
+		print_mwait(raw_buf)
+		print_common_ip(sample, symbol, dso)
+	elif name == "pwre":
+		print_common_start(comm, sample, name)
+		print_pwre(raw_buf)
+		print_common_ip(sample, symbol, dso)
+	elif name == "exstop":
+		print_common_start(comm, sample, name)
+		print_exstop(raw_buf)
+		print_common_ip(sample, symbol, dso)
+	elif name == "pwrx":
+		print_common_start(comm, sample, name)
+		print_pwrx(raw_buf)
+		print_common_ip(sample, symbol, dso)