linux-kernel - [PATCH 1/4] perf tool: Parse general/raw events from sysfs

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Date:	Thu, 15 Dec 2011 18:23:41 +0100
From:	Robert Richter <robert.richter@....com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>
Subject: [PATCH 1/4] perf tool: Parse general/raw events from sysfs

From: Lin Ming <ming.m.lin@...el.com>

PMU can export general events to sysfs, for example,

/sys/bus/event_source/devices/uncore/events
└── cycle

Then specify the event as <pmu>:<event>,

$ sudo perf stat -a -C 0 -e uncore:cycle
^C
 Performance counter stats for 'CPU 0':

        56,547,314 uncore:cycle

Raw event can be specified as <pmu>:rXXXX

$ sudo perf stat -a -C 0 -e uncore:r0101
^C
 Performance counter stats for 'CPU 0':

             8,504 uncore:r0101

Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
 tools/perf/util/parse-events.c |   84 +++++++++++++++++++++++++++++++++++++++-
 1 files changed, 82 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 586ab3f..4ce9404 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -685,7 +685,7 @@ parse_symbolic_event(const char **strp, struct perf_event_attr *attr)
 }
 
 static enum event_result
-parse_raw_event(const char **strp, struct perf_event_attr *attr)
+parse_raw_config(const char **strp, struct perf_event_attr *attr)
 {
 	const char *str = *strp;
 	u64 config;
@@ -700,7 +700,6 @@ parse_raw_event(const char **strp, struct perf_event_attr *attr)
 			return EVT_FAILED;
 
 		*strp = end;
-		attr->type = PERF_TYPE_RAW;
 		attr->config = config;
 		return EVT_HANDLED;
 	}
@@ -708,6 +707,83 @@ parse_raw_event(const char **strp, struct perf_event_attr *attr)
 }
 
 static enum event_result
+parse_raw_event(const char **strp, struct perf_event_attr *attr)
+{
+	if (parse_raw_config(strp, attr) != EVT_HANDLED)
+		return EVT_FAILED;
+
+	attr->type = PERF_TYPE_RAW;
+	return EVT_HANDLED;
+}
+
+#define EVENT_SOURCE_DIR "/sys/bus/event_source/devices"
+
+static u64 read_sysfs_entry(const char *path)
+{
+	char buf[19];
+	int fd;
+
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		return -1;
+
+	if (read(fd, buf, sizeof(buf)) < 0) {
+		close(fd);
+		return -1;
+	}
+
+	close(fd);
+	return atoll(buf);
+}
+
+static u64 get_pmu_type(const char *pmu_name)
+{
+	char evt_path[MAXPATHLEN];
+
+	snprintf(evt_path, MAXPATHLEN, "%s/%s/type", EVENT_SOURCE_DIR,
+		 pmu_name);
+
+	return read_sysfs_entry(evt_path);
+}
+
+static u64 get_pmu_event_config(const char *pmu_name, const char *evt_name)
+{
+	char evt_path[MAXPATHLEN];
+
+	snprintf(evt_path, MAXPATHLEN, "%s/%s/events/%s", EVENT_SOURCE_DIR,
+		 pmu_name, evt_name);
+
+	return read_sysfs_entry(evt_path);
+}
+
+static enum event_result
+parse_sysfs_event(const char **strp, struct perf_event_attr *attr)
+{
+	char *pmu_name, *evt_name;
+	u64 type, config;
+
+	pmu_name = strchr(*strp, ':');
+	if (!pmu_name)
+		return EVT_FAILED;
+	pmu_name = strndup(*strp, pmu_name - *strp);
+	type = get_pmu_type(pmu_name);
+	if ((int)type < 0)
+		return EVT_FAILED;
+	attr->type = type;
+
+	evt_name = strchr(*strp, ':') + 1;
+	config = get_pmu_event_config(pmu_name, evt_name);
+	*strp += strlen(pmu_name) + 1; /* + 1 for the ':' */
+
+	if ((int)config < 0)
+		return parse_raw_config(strp, attr);
+
+	attr->config = config;
+	*strp += strlen(evt_name);
+	return EVT_HANDLED;
+}
+
+static enum event_result
 parse_numeric_event(const char **strp, struct perf_event_attr *attr)
 {
 	const char *str = *strp;
@@ -788,6 +864,10 @@ parse_event_symbols(struct perf_evlist *evlist, const char **str,
 {
 	enum event_result ret;
 
+	ret = parse_sysfs_event(str, attr);
+	if (ret != EVT_FAILED)
+		goto modifier;
+
 	ret = parse_tracepoint_event(evlist, str, attr);
 	if (ret != EVT_FAILED)
 		goto modifier;
-- 
1.7.7


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